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1 /*
2  * pmcraid.c -- driver for PMC Sierra MaxRAID controller adapters
3  *
4  * Written By: Anil Ravindranath<anil_ravindranath@pmc-sierra.com>
5  *             PMC-Sierra Inc
6  *
7  * Copyright (C) 2008, 2009 PMC Sierra Inc
8  *
9  * This program is free software; you can redistribute it and/or modify
10  * it under the terms of the GNU General Public License as published by
11  * the Free Software Foundation; either version 2 of the License, or
12  * (at your option) any later version.
13  *
14  * This program is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  * GNU General Public License for more details.
18  *
19  * You should have received a copy of the GNU General Public License
20  * along with this program; if not, write to the Free Software
21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
22  * USA
23  *
24  */
25 #include <linux/fs.h>
26 #include <linux/init.h>
27 #include <linux/types.h>
28 #include <linux/errno.h>
29 #include <linux/kernel.h>
30 #include <linux/ioport.h>
31 #include <linux/delay.h>
32 #include <linux/pci.h>
33 #include <linux/wait.h>
34 #include <linux/spinlock.h>
35 #include <linux/sched.h>
36 #include <linux/interrupt.h>
37 #include <linux/blkdev.h>
38 #include <linux/firmware.h>
39 #include <linux/module.h>
40 #include <linux/moduleparam.h>
41 #include <linux/hdreg.h>
42 #include <linux/io.h>
43 #include <linux/slab.h>
44 #include <asm/irq.h>
45 #include <asm/processor.h>
46 #include <linux/libata.h>
47 #include <linux/mutex.h>
48 #include <scsi/scsi.h>
49 #include <scsi/scsi_host.h>
50 #include <scsi/scsi_device.h>
51 #include <scsi/scsi_tcq.h>
52 #include <scsi/scsi_eh.h>
53 #include <scsi/scsi_cmnd.h>
54 #include <scsi/scsicam.h>
55
56 #include "pmcraid.h"
57
58 /*
59  *   Module configuration parameters
60  */
61 static unsigned int pmcraid_debug_log;
62 static unsigned int pmcraid_disable_aen;
63 static unsigned int pmcraid_log_level = IOASC_LOG_LEVEL_MUST;
64 static unsigned int pmcraid_enable_msix;
65
66 /*
67  * Data structures to support multiple adapters by the LLD.
68  * pmcraid_adapter_count - count of configured adapters
69  */
70 static atomic_t pmcraid_adapter_count = ATOMIC_INIT(0);
71
72 /*
73  * Supporting user-level control interface through IOCTL commands.
74  * pmcraid_major - major number to use
75  * pmcraid_minor - minor number(s) to use
76  */
77 static unsigned int pmcraid_major;
78 static struct class *pmcraid_class;
79 DECLARE_BITMAP(pmcraid_minor, PMCRAID_MAX_ADAPTERS);
80
81 /*
82  * Module parameters
83  */
84 MODULE_AUTHOR("Anil Ravindranath<anil_ravindranath@pmc-sierra.com>");
85 MODULE_DESCRIPTION("PMC Sierra MaxRAID Controller Driver");
86 MODULE_LICENSE("GPL");
87 MODULE_VERSION(PMCRAID_DRIVER_VERSION);
88
89 module_param_named(log_level, pmcraid_log_level, uint, (S_IRUGO | S_IWUSR));
90 MODULE_PARM_DESC(log_level,
91                  "Enables firmware error code logging, default :1 high-severity"
92                  " errors, 2: all errors including high-severity errors,"
93                  " 0: disables logging");
94
95 module_param_named(debug, pmcraid_debug_log, uint, (S_IRUGO | S_IWUSR));
96 MODULE_PARM_DESC(debug,
97                  "Enable driver verbose message logging. Set 1 to enable."
98                  "(default: 0)");
99
100 module_param_named(disable_aen, pmcraid_disable_aen, uint, (S_IRUGO | S_IWUSR));
101 MODULE_PARM_DESC(disable_aen,
102                  "Disable driver aen notifications to apps. Set 1 to disable."
103                  "(default: 0)");
104
105 /* chip specific constants for PMC MaxRAID controllers (same for
106  * 0x5220 and 0x8010
107  */
108 static struct pmcraid_chip_details pmcraid_chip_cfg[] = {
109         {
110          .ioastatus = 0x0,
111          .ioarrin = 0x00040,
112          .mailbox = 0x7FC30,
113          .global_intr_mask = 0x00034,
114          .ioa_host_intr = 0x0009C,
115          .ioa_host_intr_clr = 0x000A0,
116          .ioa_host_msix_intr = 0x7FC40,
117          .ioa_host_mask = 0x7FC28,
118          .ioa_host_mask_clr = 0x7FC28,
119          .host_ioa_intr = 0x00020,
120          .host_ioa_intr_clr = 0x00020,
121          .transop_timeout = 300
122          }
123 };
124
125 /*
126  * PCI device ids supported by pmcraid driver
127  */
128 static struct pci_device_id pmcraid_pci_table[] = {
129         { PCI_DEVICE(PCI_VENDOR_ID_PMC, PCI_DEVICE_ID_PMC_MAXRAID),
130           0, 0, (kernel_ulong_t)&pmcraid_chip_cfg[0]
131         },
132         {}
133 };
134
135 MODULE_DEVICE_TABLE(pci, pmcraid_pci_table);
136
137
138
139 /**
140  * pmcraid_slave_alloc - Prepare for commands to a device
141  * @scsi_dev: scsi device struct
142  *
143  * This function is called by mid-layer prior to sending any command to the new
144  * device. Stores resource entry details of the device in scsi_device struct.
145  * Queuecommand uses the resource handle and other details to fill up IOARCB
146  * while sending commands to the device.
147  *
148  * Return value:
149  *        0 on success / -ENXIO if device does not exist
150  */
151 static int pmcraid_slave_alloc(struct scsi_device *scsi_dev)
152 {
153         struct pmcraid_resource_entry *temp, *res = NULL;
154         struct pmcraid_instance *pinstance;
155         u8 target, bus, lun;
156         unsigned long lock_flags;
157         int rc = -ENXIO;
158         u16 fw_version;
159
160         pinstance = shost_priv(scsi_dev->host);
161
162         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
163
164         /* Driver exposes VSET and GSCSI resources only; all other device types
165          * are not exposed. Resource list is synchronized using resource lock
166          * so any traversal or modifications to the list should be done inside
167          * this lock
168          */
169         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
170         list_for_each_entry(temp, &pinstance->used_res_q, queue) {
171
172                 /* do not expose VSETs with order-ids > MAX_VSET_TARGETS */
173                 if (RES_IS_VSET(temp->cfg_entry)) {
174                         if (fw_version <= PMCRAID_FW_VERSION_1)
175                                 target = temp->cfg_entry.unique_flags1;
176                         else
177                                 target = temp->cfg_entry.array_id & 0xFF;
178
179                         if (target > PMCRAID_MAX_VSET_TARGETS)
180                                 continue;
181                         bus = PMCRAID_VSET_BUS_ID;
182                         lun = 0;
183                 } else if (RES_IS_GSCSI(temp->cfg_entry)) {
184                         target = RES_TARGET(temp->cfg_entry.resource_address);
185                         bus = PMCRAID_PHYS_BUS_ID;
186                         lun = RES_LUN(temp->cfg_entry.resource_address);
187                 } else {
188                         continue;
189                 }
190
191                 if (bus == scsi_dev->channel &&
192                     target == scsi_dev->id &&
193                     lun == scsi_dev->lun) {
194                         res = temp;
195                         break;
196                 }
197         }
198
199         if (res) {
200                 res->scsi_dev = scsi_dev;
201                 scsi_dev->hostdata = res;
202                 res->change_detected = 0;
203                 atomic_set(&res->read_failures, 0);
204                 atomic_set(&res->write_failures, 0);
205                 rc = 0;
206         }
207         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
208         return rc;
209 }
210
211 /**
212  * pmcraid_slave_configure - Configures a SCSI device
213  * @scsi_dev: scsi device struct
214  *
215  * This function is executed by SCSI mid layer just after a device is first
216  * scanned (i.e. it has responded to an INQUIRY). For VSET resources, the
217  * timeout value (default 30s) will be over-written to a higher value (60s)
218  * and max_sectors value will be over-written to 512. It also sets queue depth
219  * to host->cmd_per_lun value
220  *
221  * Return value:
222  *        0 on success
223  */
224 static int pmcraid_slave_configure(struct scsi_device *scsi_dev)
225 {
226         struct pmcraid_resource_entry *res = scsi_dev->hostdata;
227
228         if (!res)
229                 return 0;
230
231         /* LLD exposes VSETs and Enclosure devices only */
232         if (RES_IS_GSCSI(res->cfg_entry) &&
233             scsi_dev->type != TYPE_ENCLOSURE)
234                 return -ENXIO;
235
236         pmcraid_info("configuring %x:%x:%x:%x\n",
237                      scsi_dev->host->unique_id,
238                      scsi_dev->channel,
239                      scsi_dev->id,
240                      scsi_dev->lun);
241
242         if (RES_IS_GSCSI(res->cfg_entry)) {
243                 scsi_dev->allow_restart = 1;
244         } else if (RES_IS_VSET(res->cfg_entry)) {
245                 scsi_dev->allow_restart = 1;
246                 blk_queue_rq_timeout(scsi_dev->request_queue,
247                                      PMCRAID_VSET_IO_TIMEOUT);
248                 blk_queue_max_hw_sectors(scsi_dev->request_queue,
249                                       PMCRAID_VSET_MAX_SECTORS);
250         }
251
252         if (scsi_dev->tagged_supported &&
253             (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
254                 scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
255                 scsi_adjust_queue_depth(scsi_dev, MSG_SIMPLE_TAG,
256                                         scsi_dev->host->cmd_per_lun);
257         } else {
258                 scsi_adjust_queue_depth(scsi_dev, 0,
259                                         scsi_dev->host->cmd_per_lun);
260         }
261
262         return 0;
263 }
264
265 /**
266  * pmcraid_slave_destroy - Unconfigure a SCSI device before removing it
267  *
268  * @scsi_dev: scsi device struct
269  *
270  * This is called by mid-layer before removing a device. Pointer assignments
271  * done in pmcraid_slave_alloc will be reset to NULL here.
272  *
273  * Return value
274  *   none
275  */
276 static void pmcraid_slave_destroy(struct scsi_device *scsi_dev)
277 {
278         struct pmcraid_resource_entry *res;
279
280         res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
281
282         if (res)
283                 res->scsi_dev = NULL;
284
285         scsi_dev->hostdata = NULL;
286 }
287
288 /**
289  * pmcraid_change_queue_depth - Change the device's queue depth
290  * @scsi_dev: scsi device struct
291  * @depth: depth to set
292  * @reason: calling context
293  *
294  * Return value
295  *      actual depth set
296  */
297 static int pmcraid_change_queue_depth(struct scsi_device *scsi_dev, int depth,
298                                       int reason)
299 {
300         if (reason != SCSI_QDEPTH_DEFAULT)
301                 return -EOPNOTSUPP;
302
303         if (depth > PMCRAID_MAX_CMD_PER_LUN)
304                 depth = PMCRAID_MAX_CMD_PER_LUN;
305
306         scsi_adjust_queue_depth(scsi_dev, scsi_get_tag_type(scsi_dev), depth);
307
308         return scsi_dev->queue_depth;
309 }
310
311 /**
312  * pmcraid_change_queue_type - Change the device's queue type
313  * @scsi_dev: scsi device struct
314  * @tag: type of tags to use
315  *
316  * Return value:
317  *      actual queue type set
318  */
319 static int pmcraid_change_queue_type(struct scsi_device *scsi_dev, int tag)
320 {
321         struct pmcraid_resource_entry *res;
322
323         res = (struct pmcraid_resource_entry *)scsi_dev->hostdata;
324
325         if ((res) && scsi_dev->tagged_supported &&
326             (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry))) {
327                 scsi_set_tag_type(scsi_dev, tag);
328
329                 if (tag)
330                         scsi_activate_tcq(scsi_dev, scsi_dev->queue_depth);
331                 else
332                         scsi_deactivate_tcq(scsi_dev, scsi_dev->queue_depth);
333         } else
334                 tag = 0;
335
336         return tag;
337 }
338
339
340 /**
341  * pmcraid_init_cmdblk - initializes a command block
342  *
343  * @cmd: pointer to struct pmcraid_cmd to be initialized
344  * @index: if >=0 first time initialization; otherwise reinitialization
345  *
346  * Return Value
347  *       None
348  */
349 void pmcraid_init_cmdblk(struct pmcraid_cmd *cmd, int index)
350 {
351         struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
352         dma_addr_t dma_addr = cmd->ioa_cb_bus_addr;
353
354         if (index >= 0) {
355                 /* first time initialization (called from  probe) */
356                 u32 ioasa_offset =
357                         offsetof(struct pmcraid_control_block, ioasa);
358
359                 cmd->index = index;
360                 ioarcb->response_handle = cpu_to_le32(index << 2);
361                 ioarcb->ioarcb_bus_addr = cpu_to_le64(dma_addr);
362                 ioarcb->ioasa_bus_addr = cpu_to_le64(dma_addr + ioasa_offset);
363                 ioarcb->ioasa_len = cpu_to_le16(sizeof(struct pmcraid_ioasa));
364         } else {
365                 /* re-initialization of various lengths, called once command is
366                  * processed by IOA
367                  */
368                 memset(&cmd->ioa_cb->ioarcb.cdb, 0, PMCRAID_MAX_CDB_LEN);
369                 ioarcb->hrrq_id = 0;
370                 ioarcb->request_flags0 = 0;
371                 ioarcb->request_flags1 = 0;
372                 ioarcb->cmd_timeout = 0;
373                 ioarcb->ioarcb_bus_addr &= (~0x1FULL);
374                 ioarcb->ioadl_bus_addr = 0;
375                 ioarcb->ioadl_length = 0;
376                 ioarcb->data_transfer_length = 0;
377                 ioarcb->add_cmd_param_length = 0;
378                 ioarcb->add_cmd_param_offset = 0;
379                 cmd->ioa_cb->ioasa.ioasc = 0;
380                 cmd->ioa_cb->ioasa.residual_data_length = 0;
381                 cmd->time_left = 0;
382         }
383
384         cmd->cmd_done = NULL;
385         cmd->scsi_cmd = NULL;
386         cmd->release = 0;
387         cmd->completion_req = 0;
388         cmd->sense_buffer = 0;
389         cmd->sense_buffer_dma = 0;
390         cmd->dma_handle = 0;
391         init_timer(&cmd->timer);
392 }
393
394 /**
395  * pmcraid_reinit_cmdblk - reinitialize a command block
396  *
397  * @cmd: pointer to struct pmcraid_cmd to be reinitialized
398  *
399  * Return Value
400  *       None
401  */
402 static void pmcraid_reinit_cmdblk(struct pmcraid_cmd *cmd)
403 {
404         pmcraid_init_cmdblk(cmd, -1);
405 }
406
407 /**
408  * pmcraid_get_free_cmd - get a free cmd block from command block pool
409  * @pinstance: adapter instance structure
410  *
411  * Return Value:
412  *      returns pointer to cmd block or NULL if no blocks are available
413  */
414 static struct pmcraid_cmd *pmcraid_get_free_cmd(
415         struct pmcraid_instance *pinstance
416 )
417 {
418         struct pmcraid_cmd *cmd = NULL;
419         unsigned long lock_flags;
420
421         /* free cmd block list is protected by free_pool_lock */
422         spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
423
424         if (!list_empty(&pinstance->free_cmd_pool)) {
425                 cmd = list_entry(pinstance->free_cmd_pool.next,
426                                  struct pmcraid_cmd, free_list);
427                 list_del(&cmd->free_list);
428         }
429         spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
430
431         /* Initialize the command block before giving it the caller */
432         if (cmd != NULL)
433                 pmcraid_reinit_cmdblk(cmd);
434         return cmd;
435 }
436
437 /**
438  * pmcraid_return_cmd - return a completed command block back into free pool
439  * @cmd: pointer to the command block
440  *
441  * Return Value:
442  *      nothing
443  */
444 void pmcraid_return_cmd(struct pmcraid_cmd *cmd)
445 {
446         struct pmcraid_instance *pinstance = cmd->drv_inst;
447         unsigned long lock_flags;
448
449         spin_lock_irqsave(&pinstance->free_pool_lock, lock_flags);
450         list_add_tail(&cmd->free_list, &pinstance->free_cmd_pool);
451         spin_unlock_irqrestore(&pinstance->free_pool_lock, lock_flags);
452 }
453
454 /**
455  * pmcraid_read_interrupts -  reads IOA interrupts
456  *
457  * @pinstance: pointer to adapter instance structure
458  *
459  * Return value
460  *       interrupts read from IOA
461  */
462 static u32 pmcraid_read_interrupts(struct pmcraid_instance *pinstance)
463 {
464         return (pinstance->interrupt_mode) ?
465                 ioread32(pinstance->int_regs.ioa_host_msix_interrupt_reg) :
466                 ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
467 }
468
469 /**
470  * pmcraid_disable_interrupts - Masks and clears all specified interrupts
471  *
472  * @pinstance: pointer to per adapter instance structure
473  * @intrs: interrupts to disable
474  *
475  * Return Value
476  *       None
477  */
478 static void pmcraid_disable_interrupts(
479         struct pmcraid_instance *pinstance,
480         u32 intrs
481 )
482 {
483         u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
484         u32 nmask = gmask | GLOBAL_INTERRUPT_MASK;
485
486         iowrite32(intrs, pinstance->int_regs.ioa_host_interrupt_clr_reg);
487         iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
488         ioread32(pinstance->int_regs.global_interrupt_mask_reg);
489
490         if (!pinstance->interrupt_mode) {
491                 iowrite32(intrs,
492                         pinstance->int_regs.ioa_host_interrupt_mask_reg);
493                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
494         }
495 }
496
497 /**
498  * pmcraid_enable_interrupts - Enables specified interrupts
499  *
500  * @pinstance: pointer to per adapter instance structure
501  * @intr: interrupts to enable
502  *
503  * Return Value
504  *       None
505  */
506 static void pmcraid_enable_interrupts(
507         struct pmcraid_instance *pinstance,
508         u32 intrs
509 )
510 {
511         u32 gmask = ioread32(pinstance->int_regs.global_interrupt_mask_reg);
512         u32 nmask = gmask & (~GLOBAL_INTERRUPT_MASK);
513
514         iowrite32(nmask, pinstance->int_regs.global_interrupt_mask_reg);
515
516         if (!pinstance->interrupt_mode) {
517                 iowrite32(~intrs,
518                          pinstance->int_regs.ioa_host_interrupt_mask_reg);
519                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
520         }
521
522         pmcraid_info("enabled interrupts global mask = %x intr_mask = %x\n",
523                 ioread32(pinstance->int_regs.global_interrupt_mask_reg),
524                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg));
525 }
526
527 /**
528  * pmcraid_clr_trans_op - clear trans to op interrupt
529  *
530  * @pinstance: pointer to per adapter instance structure
531  *
532  * Return Value
533  *       None
534  */
535 static void pmcraid_clr_trans_op(
536         struct pmcraid_instance *pinstance
537 )
538 {
539         unsigned long lock_flags;
540
541         if (!pinstance->interrupt_mode) {
542                 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
543                         pinstance->int_regs.ioa_host_interrupt_mask_reg);
544                 ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
545                 iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
546                         pinstance->int_regs.ioa_host_interrupt_clr_reg);
547                 ioread32(pinstance->int_regs.ioa_host_interrupt_clr_reg);
548         }
549
550         if (pinstance->reset_cmd != NULL) {
551                 del_timer(&pinstance->reset_cmd->timer);
552                 spin_lock_irqsave(
553                         pinstance->host->host_lock, lock_flags);
554                 pinstance->reset_cmd->cmd_done(pinstance->reset_cmd);
555                 spin_unlock_irqrestore(
556                         pinstance->host->host_lock, lock_flags);
557         }
558 }
559
560 /**
561  * pmcraid_reset_type - Determine the required reset type
562  * @pinstance: pointer to adapter instance structure
563  *
564  * IOA requires hard reset if any of the following conditions is true.
565  * 1. If HRRQ valid interrupt is not masked
566  * 2. IOA reset alert doorbell is set
567  * 3. If there are any error interrupts
568  */
569 static void pmcraid_reset_type(struct pmcraid_instance *pinstance)
570 {
571         u32 mask;
572         u32 intrs;
573         u32 alerts;
574
575         mask = ioread32(pinstance->int_regs.ioa_host_interrupt_mask_reg);
576         intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
577         alerts = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
578
579         if ((mask & INTRS_HRRQ_VALID) == 0 ||
580             (alerts & DOORBELL_IOA_RESET_ALERT) ||
581             (intrs & PMCRAID_ERROR_INTERRUPTS)) {
582                 pmcraid_info("IOA requires hard reset\n");
583                 pinstance->ioa_hard_reset = 1;
584         }
585
586         /* If unit check is active, trigger the dump */
587         if (intrs & INTRS_IOA_UNIT_CHECK)
588                 pinstance->ioa_unit_check = 1;
589 }
590
591 /**
592  * pmcraid_bist_done - completion function for PCI BIST
593  * @cmd: pointer to reset command
594  * Return Value
595  *      none
596  */
597
598 static void pmcraid_ioa_reset(struct pmcraid_cmd *);
599
600 static void pmcraid_bist_done(struct pmcraid_cmd *cmd)
601 {
602         struct pmcraid_instance *pinstance = cmd->drv_inst;
603         unsigned long lock_flags;
604         int rc;
605         u16 pci_reg;
606
607         rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
608
609         /* If PCI config space can't be accessed wait for another two secs */
610         if ((rc != PCIBIOS_SUCCESSFUL || (!(pci_reg & PCI_COMMAND_MEMORY))) &&
611             cmd->time_left > 0) {
612                 pmcraid_info("BIST not complete, waiting another 2 secs\n");
613                 cmd->timer.expires = jiffies + cmd->time_left;
614                 cmd->time_left = 0;
615                 cmd->timer.data = (unsigned long)cmd;
616                 cmd->timer.function =
617                         (void (*)(unsigned long))pmcraid_bist_done;
618                 add_timer(&cmd->timer);
619         } else {
620                 cmd->time_left = 0;
621                 pmcraid_info("BIST is complete, proceeding with reset\n");
622                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
623                 pmcraid_ioa_reset(cmd);
624                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
625         }
626 }
627
628 /**
629  * pmcraid_start_bist - starts BIST
630  * @cmd: pointer to reset cmd
631  * Return Value
632  *   none
633  */
634 static void pmcraid_start_bist(struct pmcraid_cmd *cmd)
635 {
636         struct pmcraid_instance *pinstance = cmd->drv_inst;
637         u32 doorbells, intrs;
638
639         /* proceed with bist and wait for 2 seconds */
640         iowrite32(DOORBELL_IOA_START_BIST,
641                 pinstance->int_regs.host_ioa_interrupt_reg);
642         doorbells = ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
643         intrs = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
644         pmcraid_info("doorbells after start bist: %x intrs: %x\n",
645                       doorbells, intrs);
646
647         cmd->time_left = msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
648         cmd->timer.data = (unsigned long)cmd;
649         cmd->timer.expires = jiffies + msecs_to_jiffies(PMCRAID_BIST_TIMEOUT);
650         cmd->timer.function = (void (*)(unsigned long))pmcraid_bist_done;
651         add_timer(&cmd->timer);
652 }
653
654 /**
655  * pmcraid_reset_alert_done - completion routine for reset_alert
656  * @cmd: pointer to command block used in reset sequence
657  * Return value
658  *  None
659  */
660 static void pmcraid_reset_alert_done(struct pmcraid_cmd *cmd)
661 {
662         struct pmcraid_instance *pinstance = cmd->drv_inst;
663         u32 status = ioread32(pinstance->ioa_status);
664         unsigned long lock_flags;
665
666         /* if the critical operation in progress bit is set or the wait times
667          * out, invoke reset engine to proceed with hard reset. If there is
668          * some more time to wait, restart the timer
669          */
670         if (((status & INTRS_CRITICAL_OP_IN_PROGRESS) == 0) ||
671             cmd->time_left <= 0) {
672                 pmcraid_info("critical op is reset proceeding with reset\n");
673                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
674                 pmcraid_ioa_reset(cmd);
675                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
676         } else {
677                 pmcraid_info("critical op is not yet reset waiting again\n");
678                 /* restart timer if some more time is available to wait */
679                 cmd->time_left -= PMCRAID_CHECK_FOR_RESET_TIMEOUT;
680                 cmd->timer.data = (unsigned long)cmd;
681                 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
682                 cmd->timer.function =
683                         (void (*)(unsigned long))pmcraid_reset_alert_done;
684                 add_timer(&cmd->timer);
685         }
686 }
687
688 /**
689  * pmcraid_reset_alert - alerts IOA for a possible reset
690  * @cmd : command block to be used for reset sequence.
691  *
692  * Return Value
693  *      returns 0 if pci config-space is accessible and RESET_DOORBELL is
694  *      successfully written to IOA. Returns non-zero in case pci_config_space
695  *      is not accessible
696  */
697 static void pmcraid_notify_ioastate(struct pmcraid_instance *, u32);
698 static void pmcraid_reset_alert(struct pmcraid_cmd *cmd)
699 {
700         struct pmcraid_instance *pinstance = cmd->drv_inst;
701         u32 doorbells;
702         int rc;
703         u16 pci_reg;
704
705         /* If we are able to access IOA PCI config space, alert IOA that we are
706          * going to reset it soon. This enables IOA to preserv persistent error
707          * data if any. In case memory space is not accessible, proceed with
708          * BIST or slot_reset
709          */
710         rc = pci_read_config_word(pinstance->pdev, PCI_COMMAND, &pci_reg);
711         if ((rc == PCIBIOS_SUCCESSFUL) && (pci_reg & PCI_COMMAND_MEMORY)) {
712
713                 /* wait for IOA permission i.e until CRITICAL_OPERATION bit is
714                  * reset IOA doesn't generate any interrupts when CRITICAL
715                  * OPERATION bit is reset. A timer is started to wait for this
716                  * bit to be reset.
717                  */
718                 cmd->time_left = PMCRAID_RESET_TIMEOUT;
719                 cmd->timer.data = (unsigned long)cmd;
720                 cmd->timer.expires = jiffies + PMCRAID_CHECK_FOR_RESET_TIMEOUT;
721                 cmd->timer.function =
722                         (void (*)(unsigned long))pmcraid_reset_alert_done;
723                 add_timer(&cmd->timer);
724
725                 iowrite32(DOORBELL_IOA_RESET_ALERT,
726                         pinstance->int_regs.host_ioa_interrupt_reg);
727                 doorbells =
728                         ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
729                 pmcraid_info("doorbells after reset alert: %x\n", doorbells);
730         } else {
731                 pmcraid_info("PCI config is not accessible starting BIST\n");
732                 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
733                 pmcraid_start_bist(cmd);
734         }
735 }
736
737 /**
738  * pmcraid_timeout_handler -  Timeout handler for internally generated ops
739  *
740  * @cmd : pointer to command structure, that got timedout
741  *
742  * This function blocks host requests and initiates an adapter reset.
743  *
744  * Return value:
745  *   None
746  */
747 static void pmcraid_timeout_handler(struct pmcraid_cmd *cmd)
748 {
749         struct pmcraid_instance *pinstance = cmd->drv_inst;
750         unsigned long lock_flags;
751
752         dev_info(&pinstance->pdev->dev,
753                 "Adapter being reset due to cmd(CDB[0] = %x) timeout\n",
754                 cmd->ioa_cb->ioarcb.cdb[0]);
755
756         /* Command timeouts result in hard reset sequence. The command that got
757          * timed out may be the one used as part of reset sequence. In this
758          * case restart reset sequence using the same command block even if
759          * reset is in progress. Otherwise fail this command and get a free
760          * command block to restart the reset sequence.
761          */
762         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
763         if (!pinstance->ioa_reset_in_progress) {
764                 pinstance->ioa_reset_attempts = 0;
765                 cmd = pmcraid_get_free_cmd(pinstance);
766
767                 /* If we are out of command blocks, just return here itself.
768                  * Some other command's timeout handler can do the reset job
769                  */
770                 if (cmd == NULL) {
771                         spin_unlock_irqrestore(pinstance->host->host_lock,
772                                                lock_flags);
773                         pmcraid_err("no free cmnd block for timeout handler\n");
774                         return;
775                 }
776
777                 pinstance->reset_cmd = cmd;
778                 pinstance->ioa_reset_in_progress = 1;
779         } else {
780                 pmcraid_info("reset is already in progress\n");
781
782                 if (pinstance->reset_cmd != cmd) {
783                         /* This command should have been given to IOA, this
784                          * command will be completed by fail_outstanding_cmds
785                          * anyway
786                          */
787                         pmcraid_err("cmd is pending but reset in progress\n");
788                 }
789
790                 /* If this command was being used as part of the reset
791                  * sequence, set cmd_done pointer to pmcraid_ioa_reset. This
792                  * causes fail_outstanding_commands not to return the command
793                  * block back to free pool
794                  */
795                 if (cmd == pinstance->reset_cmd)
796                         cmd->cmd_done = pmcraid_ioa_reset;
797         }
798
799         /* Notify apps of important IOA bringup/bringdown sequences */
800         if (pinstance->scn.ioa_state != PMC_DEVICE_EVENT_RESET_START &&
801             pinstance->scn.ioa_state != PMC_DEVICE_EVENT_SHUTDOWN_START)
802                 pmcraid_notify_ioastate(pinstance,
803                                         PMC_DEVICE_EVENT_RESET_START);
804
805         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
806         scsi_block_requests(pinstance->host);
807         pmcraid_reset_alert(cmd);
808         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
809 }
810
811 /**
812  * pmcraid_internal_done - completion routine for internally generated cmds
813  *
814  * @cmd: command that got response from IOA
815  *
816  * Return Value:
817  *       none
818  */
819 static void pmcraid_internal_done(struct pmcraid_cmd *cmd)
820 {
821         pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
822                      cmd->ioa_cb->ioarcb.cdb[0],
823                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
824
825         /* Some of the internal commands are sent with callers blocking for the
826          * response. Same will be indicated as part of cmd->completion_req
827          * field. Response path needs to wake up any waiters waiting for cmd
828          * completion if this flag is set.
829          */
830         if (cmd->completion_req) {
831                 cmd->completion_req = 0;
832                 complete(&cmd->wait_for_completion);
833         }
834
835         /* most of the internal commands are completed by caller itself, so
836          * no need to return the command block back to free pool until we are
837          * required to do so (e.g once done with initialization).
838          */
839         if (cmd->release) {
840                 cmd->release = 0;
841                 pmcraid_return_cmd(cmd);
842         }
843 }
844
845 /**
846  * pmcraid_reinit_cfgtable_done - done function for cfg table reinitialization
847  *
848  * @cmd: command that got response from IOA
849  *
850  * This routine is called after driver re-reads configuration table due to a
851  * lost CCN. It returns the command block back to free pool and schedules
852  * worker thread to add/delete devices into the system.
853  *
854  * Return Value:
855  *       none
856  */
857 static void pmcraid_reinit_cfgtable_done(struct pmcraid_cmd *cmd)
858 {
859         pmcraid_info("response internal cmd CDB[0] = %x ioasc = %x\n",
860                      cmd->ioa_cb->ioarcb.cdb[0],
861                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
862
863         if (cmd->release) {
864                 cmd->release = 0;
865                 pmcraid_return_cmd(cmd);
866         }
867         pmcraid_info("scheduling worker for config table reinitialization\n");
868         schedule_work(&cmd->drv_inst->worker_q);
869 }
870
871 /**
872  * pmcraid_erp_done - Process completion of SCSI error response from device
873  * @cmd: pmcraid_command
874  *
875  * This function copies the sense buffer into the scsi_cmd struct and completes
876  * scsi_cmd by calling scsi_done function.
877  *
878  * Return value:
879  *  none
880  */
881 static void pmcraid_erp_done(struct pmcraid_cmd *cmd)
882 {
883         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
884         struct pmcraid_instance *pinstance = cmd->drv_inst;
885         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
886
887         if (PMCRAID_IOASC_SENSE_KEY(ioasc) > 0) {
888                 scsi_cmd->result |= (DID_ERROR << 16);
889                 scmd_printk(KERN_INFO, scsi_cmd,
890                             "command CDB[0] = %x failed with IOASC: 0x%08X\n",
891                             cmd->ioa_cb->ioarcb.cdb[0], ioasc);
892         }
893
894         /* if we had allocated sense buffers for request sense, copy the sense
895          * release the buffers
896          */
897         if (cmd->sense_buffer != NULL) {
898                 memcpy(scsi_cmd->sense_buffer,
899                        cmd->sense_buffer,
900                        SCSI_SENSE_BUFFERSIZE);
901                 pci_free_consistent(pinstance->pdev,
902                                     SCSI_SENSE_BUFFERSIZE,
903                                     cmd->sense_buffer, cmd->sense_buffer_dma);
904                 cmd->sense_buffer = NULL;
905                 cmd->sense_buffer_dma = 0;
906         }
907
908         scsi_dma_unmap(scsi_cmd);
909         pmcraid_return_cmd(cmd);
910         scsi_cmd->scsi_done(scsi_cmd);
911 }
912
913 /**
914  * pmcraid_fire_command - sends an IOA command to adapter
915  *
916  * This function adds the given block into pending command list
917  * and returns without waiting
918  *
919  * @cmd : command to be sent to the device
920  *
921  * Return Value
922  *      None
923  */
924 static void _pmcraid_fire_command(struct pmcraid_cmd *cmd)
925 {
926         struct pmcraid_instance *pinstance = cmd->drv_inst;
927         unsigned long lock_flags;
928
929         /* Add this command block to pending cmd pool. We do this prior to
930          * writting IOARCB to ioarrin because IOA might complete the command
931          * by the time we are about to add it to the list. Response handler
932          * (isr/tasklet) looks for cmd block in the pending pending list.
933          */
934         spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
935         list_add_tail(&cmd->free_list, &pinstance->pending_cmd_pool);
936         spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
937         atomic_inc(&pinstance->outstanding_cmds);
938
939         /* driver writes lower 32-bit value of IOARCB address only */
940         mb();
941         iowrite32(le32_to_cpu(cmd->ioa_cb->ioarcb.ioarcb_bus_addr),
942                   pinstance->ioarrin);
943 }
944
945 /**
946  * pmcraid_send_cmd - fires a command to IOA
947  *
948  * This function also sets up timeout function, and command completion
949  * function
950  *
951  * @cmd: pointer to the command block to be fired to IOA
952  * @cmd_done: command completion function, called once IOA responds
953  * @timeout: timeout to wait for this command completion
954  * @timeout_func: timeout handler
955  *
956  * Return value
957  *   none
958  */
959 static void pmcraid_send_cmd(
960         struct pmcraid_cmd *cmd,
961         void (*cmd_done) (struct pmcraid_cmd *),
962         unsigned long timeout,
963         void (*timeout_func) (struct pmcraid_cmd *)
964 )
965 {
966         /* initialize done function */
967         cmd->cmd_done = cmd_done;
968
969         if (timeout_func) {
970                 /* setup timeout handler */
971                 cmd->timer.data = (unsigned long)cmd;
972                 cmd->timer.expires = jiffies + timeout;
973                 cmd->timer.function = (void (*)(unsigned long))timeout_func;
974                 add_timer(&cmd->timer);
975         }
976
977         /* fire the command to IOA */
978         _pmcraid_fire_command(cmd);
979 }
980
981 /**
982  * pmcraid_ioa_shutdown_done - completion function for IOA shutdown command
983  * @cmd: pointer to the command block used for sending IOA shutdown command
984  *
985  * Return value
986  *  None
987  */
988 static void pmcraid_ioa_shutdown_done(struct pmcraid_cmd *cmd)
989 {
990         struct pmcraid_instance *pinstance = cmd->drv_inst;
991         unsigned long lock_flags;
992
993         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
994         pmcraid_ioa_reset(cmd);
995         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
996 }
997
998 /**
999  * pmcraid_ioa_shutdown - sends SHUTDOWN command to ioa
1000  *
1001  * @cmd: pointer to the command block used as part of reset sequence
1002  *
1003  * Return Value
1004  *  None
1005  */
1006 static void pmcraid_ioa_shutdown(struct pmcraid_cmd *cmd)
1007 {
1008         pmcraid_info("response for Cancel CCN CDB[0] = %x ioasc = %x\n",
1009                      cmd->ioa_cb->ioarcb.cdb[0],
1010                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1011
1012         /* Note that commands sent during reset require next command to be sent
1013          * to IOA. Hence reinit the done function as well as timeout function
1014          */
1015         pmcraid_reinit_cmdblk(cmd);
1016         cmd->ioa_cb->ioarcb.request_type = REQ_TYPE_IOACMD;
1017         cmd->ioa_cb->ioarcb.resource_handle =
1018                 cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1019         cmd->ioa_cb->ioarcb.cdb[0] = PMCRAID_IOA_SHUTDOWN;
1020         cmd->ioa_cb->ioarcb.cdb[1] = PMCRAID_SHUTDOWN_NORMAL;
1021
1022         /* fire shutdown command to hardware. */
1023         pmcraid_info("firing normal shutdown command (%d) to IOA\n",
1024                      le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle));
1025
1026         pmcraid_notify_ioastate(cmd->drv_inst, PMC_DEVICE_EVENT_SHUTDOWN_START);
1027
1028         pmcraid_send_cmd(cmd, pmcraid_ioa_shutdown_done,
1029                          PMCRAID_SHUTDOWN_TIMEOUT,
1030                          pmcraid_timeout_handler);
1031 }
1032
1033 /**
1034  * pmcraid_get_fwversion_done - completion function for get_fwversion
1035  *
1036  * @cmd: pointer to command block used to send INQUIRY command
1037  *
1038  * Return Value
1039  *      none
1040  */
1041 static void pmcraid_querycfg(struct pmcraid_cmd *);
1042
1043 static void pmcraid_get_fwversion_done(struct pmcraid_cmd *cmd)
1044 {
1045         struct pmcraid_instance *pinstance = cmd->drv_inst;
1046         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1047         unsigned long lock_flags;
1048
1049         /* configuration table entry size depends on firmware version. If fw
1050          * version is not known, it is not possible to interpret IOA config
1051          * table
1052          */
1053         if (ioasc) {
1054                 pmcraid_err("IOA Inquiry failed with %x\n", ioasc);
1055                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1056                 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1057                 pmcraid_reset_alert(cmd);
1058                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1059         } else  {
1060                 pmcraid_querycfg(cmd);
1061         }
1062 }
1063
1064 /**
1065  * pmcraid_get_fwversion - reads firmware version information
1066  *
1067  * @cmd: pointer to command block used to send INQUIRY command
1068  *
1069  * Return Value
1070  *      none
1071  */
1072 static void pmcraid_get_fwversion(struct pmcraid_cmd *cmd)
1073 {
1074         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1075         struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
1076         struct pmcraid_instance *pinstance = cmd->drv_inst;
1077         u16 data_size = sizeof(struct pmcraid_inquiry_data);
1078
1079         pmcraid_reinit_cmdblk(cmd);
1080         ioarcb->request_type = REQ_TYPE_SCSI;
1081         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1082         ioarcb->cdb[0] = INQUIRY;
1083         ioarcb->cdb[1] = 1;
1084         ioarcb->cdb[2] = 0xD0;
1085         ioarcb->cdb[3] = (data_size >> 8) & 0xFF;
1086         ioarcb->cdb[4] = data_size & 0xFF;
1087
1088         /* Since entire inquiry data it can be part of IOARCB itself
1089          */
1090         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1091                                         offsetof(struct pmcraid_ioarcb,
1092                                                 add_data.u.ioadl[0]));
1093         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1094         ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
1095
1096         ioarcb->request_flags0 |= NO_LINK_DESCS;
1097         ioarcb->data_transfer_length = cpu_to_le32(data_size);
1098         ioadl = &(ioarcb->add_data.u.ioadl[0]);
1099         ioadl->flags = IOADL_FLAGS_LAST_DESC;
1100         ioadl->address = cpu_to_le64(pinstance->inq_data_baddr);
1101         ioadl->data_len = cpu_to_le32(data_size);
1102
1103         pmcraid_send_cmd(cmd, pmcraid_get_fwversion_done,
1104                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
1105 }
1106
1107 /**
1108  * pmcraid_identify_hrrq - registers host rrq buffers with IOA
1109  * @cmd: pointer to command block to be used for identify hrrq
1110  *
1111  * Return Value
1112  *       none
1113  */
1114 static void pmcraid_identify_hrrq(struct pmcraid_cmd *cmd)
1115 {
1116         struct pmcraid_instance *pinstance = cmd->drv_inst;
1117         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1118         int index = cmd->hrrq_index;
1119         __be64 hrrq_addr = cpu_to_be64(pinstance->hrrq_start_bus_addr[index]);
1120         u32 hrrq_size = cpu_to_be32(sizeof(u32) * PMCRAID_MAX_CMD);
1121         void (*done_function)(struct pmcraid_cmd *);
1122
1123         pmcraid_reinit_cmdblk(cmd);
1124         cmd->hrrq_index = index + 1;
1125
1126         if (cmd->hrrq_index < pinstance->num_hrrq) {
1127                 done_function = pmcraid_identify_hrrq;
1128         } else {
1129                 cmd->hrrq_index = 0;
1130                 done_function = pmcraid_get_fwversion;
1131         }
1132
1133         /* Initialize ioarcb */
1134         ioarcb->request_type = REQ_TYPE_IOACMD;
1135         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1136
1137         /* initialize the hrrq number where IOA will respond to this command */
1138         ioarcb->hrrq_id = index;
1139         ioarcb->cdb[0] = PMCRAID_IDENTIFY_HRRQ;
1140         ioarcb->cdb[1] = index;
1141
1142         /* IOA expects 64-bit pci address to be written in B.E format
1143          * (i.e cdb[2]=MSByte..cdb[9]=LSB.
1144          */
1145         pmcraid_info("HRRQ_IDENTIFY with hrrq:ioarcb:index => %llx:%llx:%x\n",
1146                      hrrq_addr, ioarcb->ioarcb_bus_addr, index);
1147
1148         memcpy(&(ioarcb->cdb[2]), &hrrq_addr, sizeof(hrrq_addr));
1149         memcpy(&(ioarcb->cdb[10]), &hrrq_size, sizeof(hrrq_size));
1150
1151         /* Subsequent commands require HRRQ identification to be successful.
1152          * Note that this gets called even during reset from SCSI mid-layer
1153          * or tasklet
1154          */
1155         pmcraid_send_cmd(cmd, done_function,
1156                          PMCRAID_INTERNAL_TIMEOUT,
1157                          pmcraid_timeout_handler);
1158 }
1159
1160 static void pmcraid_process_ccn(struct pmcraid_cmd *cmd);
1161 static void pmcraid_process_ldn(struct pmcraid_cmd *cmd);
1162
1163 /**
1164  * pmcraid_send_hcam_cmd - send an initialized command block(HCAM) to IOA
1165  *
1166  * @cmd: initialized command block pointer
1167  *
1168  * Return Value
1169  *   none
1170  */
1171 static void pmcraid_send_hcam_cmd(struct pmcraid_cmd *cmd)
1172 {
1173         if (cmd->ioa_cb->ioarcb.cdb[1] == PMCRAID_HCAM_CODE_CONFIG_CHANGE)
1174                 atomic_set(&(cmd->drv_inst->ccn.ignore), 0);
1175         else
1176                 atomic_set(&(cmd->drv_inst->ldn.ignore), 0);
1177
1178         pmcraid_send_cmd(cmd, cmd->cmd_done, 0, NULL);
1179 }
1180
1181 /**
1182  * pmcraid_init_hcam - send an initialized command block(HCAM) to IOA
1183  *
1184  * @pinstance: pointer to adapter instance structure
1185  * @type: HCAM type
1186  *
1187  * Return Value
1188  *   pointer to initialized pmcraid_cmd structure or NULL
1189  */
1190 static struct pmcraid_cmd *pmcraid_init_hcam
1191 (
1192         struct pmcraid_instance *pinstance,
1193         u8 type
1194 )
1195 {
1196         struct pmcraid_cmd *cmd;
1197         struct pmcraid_ioarcb *ioarcb;
1198         struct pmcraid_ioadl_desc *ioadl;
1199         struct pmcraid_hostrcb *hcam;
1200         void (*cmd_done) (struct pmcraid_cmd *);
1201         dma_addr_t dma;
1202         int rcb_size;
1203
1204         cmd = pmcraid_get_free_cmd(pinstance);
1205
1206         if (!cmd) {
1207                 pmcraid_err("no free command blocks for hcam\n");
1208                 return cmd;
1209         }
1210
1211         if (type == PMCRAID_HCAM_CODE_CONFIG_CHANGE) {
1212                 rcb_size = sizeof(struct pmcraid_hcam_ccn_ext);
1213                 cmd_done = pmcraid_process_ccn;
1214                 dma = pinstance->ccn.baddr + PMCRAID_AEN_HDR_SIZE;
1215                 hcam = &pinstance->ccn;
1216         } else {
1217                 rcb_size = sizeof(struct pmcraid_hcam_ldn);
1218                 cmd_done = pmcraid_process_ldn;
1219                 dma = pinstance->ldn.baddr + PMCRAID_AEN_HDR_SIZE;
1220                 hcam = &pinstance->ldn;
1221         }
1222
1223         /* initialize command pointer used for HCAM registration */
1224         hcam->cmd = cmd;
1225
1226         ioarcb = &cmd->ioa_cb->ioarcb;
1227         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
1228                                         offsetof(struct pmcraid_ioarcb,
1229                                                 add_data.u.ioadl[0]));
1230         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
1231         ioadl = ioarcb->add_data.u.ioadl;
1232
1233         /* Initialize ioarcb */
1234         ioarcb->request_type = REQ_TYPE_HCAM;
1235         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
1236         ioarcb->cdb[0] = PMCRAID_HOST_CONTROLLED_ASYNC;
1237         ioarcb->cdb[1] = type;
1238         ioarcb->cdb[7] = (rcb_size >> 8) & 0xFF;
1239         ioarcb->cdb[8] = (rcb_size) & 0xFF;
1240
1241         ioarcb->data_transfer_length = cpu_to_le32(rcb_size);
1242
1243         ioadl[0].flags |= IOADL_FLAGS_READ_LAST;
1244         ioadl[0].data_len = cpu_to_le32(rcb_size);
1245         ioadl[0].address = cpu_to_le32(dma);
1246
1247         cmd->cmd_done = cmd_done;
1248         return cmd;
1249 }
1250
1251 /**
1252  * pmcraid_send_hcam - Send an HCAM to IOA
1253  * @pinstance: ioa config struct
1254  * @type: HCAM type
1255  *
1256  * This function will send a Host Controlled Async command to IOA.
1257  *
1258  * Return value:
1259  *      none
1260  */
1261 static void pmcraid_send_hcam(struct pmcraid_instance *pinstance, u8 type)
1262 {
1263         struct pmcraid_cmd *cmd = pmcraid_init_hcam(pinstance, type);
1264         pmcraid_send_hcam_cmd(cmd);
1265 }
1266
1267
1268 /**
1269  * pmcraid_prepare_cancel_cmd - prepares a command block to abort another
1270  *
1271  * @cmd: pointer to cmd that is used as cancelling command
1272  * @cmd_to_cancel: pointer to the command that needs to be cancelled
1273  */
1274 static void pmcraid_prepare_cancel_cmd(
1275         struct pmcraid_cmd *cmd,
1276         struct pmcraid_cmd *cmd_to_cancel
1277 )
1278 {
1279         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
1280         __be64 ioarcb_addr = cmd_to_cancel->ioa_cb->ioarcb.ioarcb_bus_addr;
1281
1282         /* Get the resource handle to where the command to be aborted has been
1283          * sent.
1284          */
1285         ioarcb->resource_handle = cmd_to_cancel->ioa_cb->ioarcb.resource_handle;
1286         ioarcb->request_type = REQ_TYPE_IOACMD;
1287         memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
1288         ioarcb->cdb[0] = PMCRAID_ABORT_CMD;
1289
1290         /* IOARCB address of the command to be cancelled is given in
1291          * cdb[2]..cdb[9] is Big-Endian format. Note that length bits in
1292          * IOARCB address are not masked.
1293          */
1294         ioarcb_addr = cpu_to_be64(ioarcb_addr);
1295         memcpy(&(ioarcb->cdb[2]), &ioarcb_addr, sizeof(ioarcb_addr));
1296 }
1297
1298 /**
1299  * pmcraid_cancel_hcam - sends ABORT task to abort a given HCAM
1300  *
1301  * @cmd: command to be used as cancelling command
1302  * @type: HCAM type
1303  * @cmd_done: op done function for the cancelling command
1304  */
1305 static void pmcraid_cancel_hcam(
1306         struct pmcraid_cmd *cmd,
1307         u8 type,
1308         void (*cmd_done) (struct pmcraid_cmd *)
1309 )
1310 {
1311         struct pmcraid_instance *pinstance;
1312         struct pmcraid_hostrcb  *hcam;
1313
1314         pinstance = cmd->drv_inst;
1315         hcam =  (type == PMCRAID_HCAM_CODE_LOG_DATA) ?
1316                 &pinstance->ldn : &pinstance->ccn;
1317
1318         /* prepare for cancelling previous hcam command. If the HCAM is
1319          * currently not pending with IOA, we would have hcam->cmd as non-null
1320          */
1321         if (hcam->cmd == NULL)
1322                 return;
1323
1324         pmcraid_prepare_cancel_cmd(cmd, hcam->cmd);
1325
1326         /* writing to IOARRIN must be protected by host_lock, as mid-layer
1327          * schedule queuecommand while we are doing this
1328          */
1329         pmcraid_send_cmd(cmd, cmd_done,
1330                          PMCRAID_INTERNAL_TIMEOUT,
1331                          pmcraid_timeout_handler);
1332 }
1333
1334 /**
1335  * pmcraid_cancel_ccn - cancel CCN HCAM already registered with IOA
1336  *
1337  * @cmd: command block to be used for cancelling the HCAM
1338  */
1339 static void pmcraid_cancel_ccn(struct pmcraid_cmd *cmd)
1340 {
1341         pmcraid_info("response for Cancel LDN CDB[0] = %x ioasc = %x\n",
1342                      cmd->ioa_cb->ioarcb.cdb[0],
1343                      le32_to_cpu(cmd->ioa_cb->ioasa.ioasc));
1344
1345         pmcraid_reinit_cmdblk(cmd);
1346
1347         pmcraid_cancel_hcam(cmd,
1348                             PMCRAID_HCAM_CODE_CONFIG_CHANGE,
1349                             pmcraid_ioa_shutdown);
1350 }
1351
1352 /**
1353  * pmcraid_cancel_ldn - cancel LDN HCAM already registered with IOA
1354  *
1355  * @cmd: command block to be used for cancelling the HCAM
1356  */
1357 static void pmcraid_cancel_ldn(struct pmcraid_cmd *cmd)
1358 {
1359         pmcraid_cancel_hcam(cmd,
1360                             PMCRAID_HCAM_CODE_LOG_DATA,
1361                             pmcraid_cancel_ccn);
1362 }
1363
1364 /**
1365  * pmcraid_expose_resource - check if the resource can be exposed to OS
1366  *
1367  * @fw_version: firmware version code
1368  * @cfgte: pointer to configuration table entry of the resource
1369  *
1370  * Return value:
1371  *      true if resource can be added to midlayer, false(0) otherwise
1372  */
1373 static int pmcraid_expose_resource(u16 fw_version,
1374                                    struct pmcraid_config_table_entry *cfgte)
1375 {
1376         int retval = 0;
1377
1378         if (cfgte->resource_type == RES_TYPE_VSET) {
1379                 if (fw_version <= PMCRAID_FW_VERSION_1)
1380                         retval = ((cfgte->unique_flags1 & 0x80) == 0);
1381                 else
1382                         retval = ((cfgte->unique_flags0 & 0x80) == 0 &&
1383                                   (cfgte->unique_flags1 & 0x80) == 0);
1384
1385         } else if (cfgte->resource_type == RES_TYPE_GSCSI)
1386                 retval = (RES_BUS(cfgte->resource_address) !=
1387                                 PMCRAID_VIRTUAL_ENCL_BUS_ID);
1388         return retval;
1389 }
1390
1391 /* attributes supported by pmcraid_event_family */
1392 enum {
1393         PMCRAID_AEN_ATTR_UNSPEC,
1394         PMCRAID_AEN_ATTR_EVENT,
1395         __PMCRAID_AEN_ATTR_MAX,
1396 };
1397 #define PMCRAID_AEN_ATTR_MAX (__PMCRAID_AEN_ATTR_MAX - 1)
1398
1399 /* commands supported by pmcraid_event_family */
1400 enum {
1401         PMCRAID_AEN_CMD_UNSPEC,
1402         PMCRAID_AEN_CMD_EVENT,
1403         __PMCRAID_AEN_CMD_MAX,
1404 };
1405 #define PMCRAID_AEN_CMD_MAX (__PMCRAID_AEN_CMD_MAX - 1)
1406
1407 static struct genl_family pmcraid_event_family = {
1408         .id = GENL_ID_GENERATE,
1409         .name = "pmcraid",
1410         .version = 1,
1411         .maxattr = PMCRAID_AEN_ATTR_MAX
1412 };
1413
1414 /**
1415  * pmcraid_netlink_init - registers pmcraid_event_family
1416  *
1417  * Return value:
1418  *      0 if the pmcraid_event_family is successfully registered
1419  *      with netlink generic, non-zero otherwise
1420  */
1421 static int pmcraid_netlink_init(void)
1422 {
1423         int result;
1424
1425         result = genl_register_family(&pmcraid_event_family);
1426
1427         if (result)
1428                 return result;
1429
1430         pmcraid_info("registered NETLINK GENERIC group: %d\n",
1431                      pmcraid_event_family.id);
1432
1433         return result;
1434 }
1435
1436 /**
1437  * pmcraid_netlink_release - unregisters pmcraid_event_family
1438  *
1439  * Return value:
1440  *      none
1441  */
1442 static void pmcraid_netlink_release(void)
1443 {
1444         genl_unregister_family(&pmcraid_event_family);
1445 }
1446
1447 /**
1448  * pmcraid_notify_aen - sends event msg to user space application
1449  * @pinstance: pointer to adapter instance structure
1450  * @type: HCAM type
1451  *
1452  * Return value:
1453  *      0 if success, error value in case of any failure.
1454  */
1455 static int pmcraid_notify_aen(
1456         struct pmcraid_instance *pinstance,
1457         struct pmcraid_aen_msg  *aen_msg,
1458         u32    data_size
1459 )
1460 {
1461         struct sk_buff *skb;
1462         void *msg_header;
1463         u32  total_size, nla_genl_hdr_total_size;
1464         int result;
1465
1466         aen_msg->hostno = (pinstance->host->unique_id << 16 |
1467                            MINOR(pinstance->cdev.dev));
1468         aen_msg->length = data_size;
1469
1470         data_size += sizeof(*aen_msg);
1471
1472         total_size = nla_total_size(data_size);
1473         /* Add GENL_HDR to total_size */
1474         nla_genl_hdr_total_size =
1475                 (total_size + (GENL_HDRLEN +
1476                 ((struct genl_family *)&pmcraid_event_family)->hdrsize)
1477                  + NLMSG_HDRLEN);
1478         skb = genlmsg_new(nla_genl_hdr_total_size, GFP_ATOMIC);
1479
1480
1481         if (!skb) {
1482                 pmcraid_err("Failed to allocate aen data SKB of size: %x\n",
1483                              total_size);
1484                 return -ENOMEM;
1485         }
1486
1487         /* add the genetlink message header */
1488         msg_header = genlmsg_put(skb, 0, 0,
1489                                  &pmcraid_event_family, 0,
1490                                  PMCRAID_AEN_CMD_EVENT);
1491         if (!msg_header) {
1492                 pmcraid_err("failed to copy command details\n");
1493                 nlmsg_free(skb);
1494                 return -ENOMEM;
1495         }
1496
1497         result = nla_put(skb, PMCRAID_AEN_ATTR_EVENT, data_size, aen_msg);
1498
1499         if (result) {
1500                 pmcraid_err("failed to copy AEN attribute data\n");
1501                 nlmsg_free(skb);
1502                 return -EINVAL;
1503         }
1504
1505         /* send genetlink multicast message to notify appplications */
1506         result = genlmsg_end(skb, msg_header);
1507
1508         if (result < 0) {
1509                 pmcraid_err("genlmsg_end failed\n");
1510                 nlmsg_free(skb);
1511                 return result;
1512         }
1513
1514         result =
1515                 genlmsg_multicast(&pmcraid_event_family, skb, 0,
1516                                   pmcraid_event_family.id, GFP_ATOMIC);
1517
1518         /* If there are no listeners, genlmsg_multicast may return non-zero
1519          * value.
1520          */
1521         if (result)
1522                 pmcraid_info("error (%x) sending aen event message\n", result);
1523         return result;
1524 }
1525
1526 /**
1527  * pmcraid_notify_ccn - notifies about CCN event msg to user space
1528  * @pinstance: pointer adapter instance structure
1529  *
1530  * Return value:
1531  *      0 if success, error value in case of any failure
1532  */
1533 static int pmcraid_notify_ccn(struct pmcraid_instance *pinstance)
1534 {
1535         return pmcraid_notify_aen(pinstance,
1536                                 pinstance->ccn.msg,
1537                                 pinstance->ccn.hcam->data_len +
1538                                 sizeof(struct pmcraid_hcam_hdr));
1539 }
1540
1541 /**
1542  * pmcraid_notify_ldn - notifies about CCN event msg to user space
1543  * @pinstance: pointer adapter instance structure
1544  *
1545  * Return value:
1546  *      0 if success, error value in case of any failure
1547  */
1548 static int pmcraid_notify_ldn(struct pmcraid_instance *pinstance)
1549 {
1550         return pmcraid_notify_aen(pinstance,
1551                                 pinstance->ldn.msg,
1552                                 pinstance->ldn.hcam->data_len +
1553                                 sizeof(struct pmcraid_hcam_hdr));
1554 }
1555
1556 /**
1557  * pmcraid_notify_ioastate - sends IOA state event msg to user space
1558  * @pinstance: pointer adapter instance structure
1559  * @evt: controller state event to be sent
1560  *
1561  * Return value:
1562  *      0 if success, error value in case of any failure
1563  */
1564 static void pmcraid_notify_ioastate(struct pmcraid_instance *pinstance, u32 evt)
1565 {
1566         pinstance->scn.ioa_state = evt;
1567         pmcraid_notify_aen(pinstance,
1568                           &pinstance->scn.msg,
1569                           sizeof(u32));
1570 }
1571
1572 /**
1573  * pmcraid_handle_config_change - Handle a config change from the adapter
1574  * @pinstance: pointer to per adapter instance structure
1575  *
1576  * Return value:
1577  *  none
1578  */
1579
1580 static void pmcraid_handle_config_change(struct pmcraid_instance *pinstance)
1581 {
1582         struct pmcraid_config_table_entry *cfg_entry;
1583         struct pmcraid_hcam_ccn *ccn_hcam;
1584         struct pmcraid_cmd *cmd;
1585         struct pmcraid_cmd *cfgcmd;
1586         struct pmcraid_resource_entry *res = NULL;
1587         unsigned long lock_flags;
1588         unsigned long host_lock_flags;
1589         u32 new_entry = 1;
1590         u32 hidden_entry = 0;
1591         u16 fw_version;
1592         int rc;
1593
1594         ccn_hcam = (struct pmcraid_hcam_ccn *)pinstance->ccn.hcam;
1595         cfg_entry = &ccn_hcam->cfg_entry;
1596         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
1597
1598         pmcraid_info("CCN(%x): %x timestamp: %llx type: %x lost: %x flags: %x \
1599                  res: %x:%x:%x:%x\n",
1600                  pinstance->ccn.hcam->ilid,
1601                  pinstance->ccn.hcam->op_code,
1602                 ((pinstance->ccn.hcam->timestamp1) |
1603                 ((pinstance->ccn.hcam->timestamp2 & 0xffffffffLL) << 32)),
1604                  pinstance->ccn.hcam->notification_type,
1605                  pinstance->ccn.hcam->notification_lost,
1606                  pinstance->ccn.hcam->flags,
1607                  pinstance->host->unique_id,
1608                  RES_IS_VSET(*cfg_entry) ? PMCRAID_VSET_BUS_ID :
1609                  (RES_IS_GSCSI(*cfg_entry) ? PMCRAID_PHYS_BUS_ID :
1610                         RES_BUS(cfg_entry->resource_address)),
1611                  RES_IS_VSET(*cfg_entry) ?
1612                         (fw_version <= PMCRAID_FW_VERSION_1 ?
1613                                 cfg_entry->unique_flags1 :
1614                                         cfg_entry->array_id & 0xFF) :
1615                         RES_TARGET(cfg_entry->resource_address),
1616                  RES_LUN(cfg_entry->resource_address));
1617
1618
1619         /* If this HCAM indicates a lost notification, read the config table */
1620         if (pinstance->ccn.hcam->notification_lost) {
1621                 cfgcmd = pmcraid_get_free_cmd(pinstance);
1622                 if (cfgcmd) {
1623                         pmcraid_info("lost CCN, reading config table\b");
1624                         pinstance->reinit_cfg_table = 1;
1625                         pmcraid_querycfg(cfgcmd);
1626                 } else {
1627                         pmcraid_err("lost CCN, no free cmd for querycfg\n");
1628                 }
1629                 goto out_notify_apps;
1630         }
1631
1632         /* If this resource is not going to be added to mid-layer, just notify
1633          * applications and return. If this notification is about hiding a VSET
1634          * resource, check if it was exposed already.
1635          */
1636         if (pinstance->ccn.hcam->notification_type ==
1637             NOTIFICATION_TYPE_ENTRY_CHANGED &&
1638             cfg_entry->resource_type == RES_TYPE_VSET) {
1639
1640                 if (fw_version <= PMCRAID_FW_VERSION_1)
1641                         hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1642                 else
1643                         hidden_entry = (cfg_entry->unique_flags1 & 0x80) != 0;
1644
1645         } else if (!pmcraid_expose_resource(fw_version, cfg_entry)) {
1646                 goto out_notify_apps;
1647         }
1648
1649         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
1650         list_for_each_entry(res, &pinstance->used_res_q, queue) {
1651                 rc = memcmp(&res->cfg_entry.resource_address,
1652                             &cfg_entry->resource_address,
1653                             sizeof(cfg_entry->resource_address));
1654                 if (!rc) {
1655                         new_entry = 0;
1656                         break;
1657                 }
1658         }
1659
1660         if (new_entry) {
1661
1662                 if (hidden_entry) {
1663                         spin_unlock_irqrestore(&pinstance->resource_lock,
1664                                                 lock_flags);
1665                         goto out_notify_apps;
1666                 }
1667
1668                 /* If there are more number of resources than what driver can
1669                  * manage, do not notify the applications about the CCN. Just
1670                  * ignore this notifications and re-register the same HCAM
1671                  */
1672                 if (list_empty(&pinstance->free_res_q)) {
1673                         spin_unlock_irqrestore(&pinstance->resource_lock,
1674                                                 lock_flags);
1675                         pmcraid_err("too many resources attached\n");
1676                         spin_lock_irqsave(pinstance->host->host_lock,
1677                                           host_lock_flags);
1678                         pmcraid_send_hcam(pinstance,
1679                                           PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1680                         spin_unlock_irqrestore(pinstance->host->host_lock,
1681                                                host_lock_flags);
1682                         return;
1683                 }
1684
1685                 res = list_entry(pinstance->free_res_q.next,
1686                                  struct pmcraid_resource_entry, queue);
1687
1688                 list_del(&res->queue);
1689                 res->scsi_dev = NULL;
1690                 res->reset_progress = 0;
1691                 list_add_tail(&res->queue, &pinstance->used_res_q);
1692         }
1693
1694         memcpy(&res->cfg_entry, cfg_entry, pinstance->config_table_entry_size);
1695
1696         if (pinstance->ccn.hcam->notification_type ==
1697             NOTIFICATION_TYPE_ENTRY_DELETED || hidden_entry) {
1698                 if (res->scsi_dev) {
1699                         if (fw_version <= PMCRAID_FW_VERSION_1)
1700                                 res->cfg_entry.unique_flags1 &= 0x7F;
1701                         else
1702                                 res->cfg_entry.array_id &= 0xFF;
1703                         res->change_detected = RES_CHANGE_DEL;
1704                         res->cfg_entry.resource_handle =
1705                                 PMCRAID_INVALID_RES_HANDLE;
1706                         schedule_work(&pinstance->worker_q);
1707                 } else {
1708                         /* This may be one of the non-exposed resources */
1709                         list_move_tail(&res->queue, &pinstance->free_res_q);
1710                 }
1711         } else if (!res->scsi_dev) {
1712                 res->change_detected = RES_CHANGE_ADD;
1713                 schedule_work(&pinstance->worker_q);
1714         }
1715         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
1716
1717 out_notify_apps:
1718
1719         /* Notify configuration changes to registered applications.*/
1720         if (!pmcraid_disable_aen)
1721                 pmcraid_notify_ccn(pinstance);
1722
1723         cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1724         if (cmd)
1725                 pmcraid_send_hcam_cmd(cmd);
1726 }
1727
1728 /**
1729  * pmcraid_get_error_info - return error string for an ioasc
1730  * @ioasc: ioasc code
1731  * Return Value
1732  *       none
1733  */
1734 static struct pmcraid_ioasc_error *pmcraid_get_error_info(u32 ioasc)
1735 {
1736         int i;
1737         for (i = 0; i < ARRAY_SIZE(pmcraid_ioasc_error_table); i++) {
1738                 if (pmcraid_ioasc_error_table[i].ioasc_code == ioasc)
1739                         return &pmcraid_ioasc_error_table[i];
1740         }
1741         return NULL;
1742 }
1743
1744 /**
1745  * pmcraid_ioasc_logger - log IOASC information based user-settings
1746  * @ioasc: ioasc code
1747  * @cmd: pointer to command that resulted in 'ioasc'
1748  */
1749 void pmcraid_ioasc_logger(u32 ioasc, struct pmcraid_cmd *cmd)
1750 {
1751         struct pmcraid_ioasc_error *error_info = pmcraid_get_error_info(ioasc);
1752
1753         if (error_info == NULL ||
1754                 cmd->drv_inst->current_log_level < error_info->log_level)
1755                 return;
1756
1757         /* log the error string */
1758         pmcraid_err("cmd [%x] for resource %x failed with %x(%s)\n",
1759                 cmd->ioa_cb->ioarcb.cdb[0],
1760                 cmd->ioa_cb->ioarcb.resource_handle,
1761                 le32_to_cpu(ioasc), error_info->error_string);
1762 }
1763
1764 /**
1765  * pmcraid_handle_error_log - Handle a config change (error log) from the IOA
1766  *
1767  * @pinstance: pointer to per adapter instance structure
1768  *
1769  * Return value:
1770  *  none
1771  */
1772 static void pmcraid_handle_error_log(struct pmcraid_instance *pinstance)
1773 {
1774         struct pmcraid_hcam_ldn *hcam_ldn;
1775         u32 ioasc;
1776
1777         hcam_ldn = (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1778
1779         pmcraid_info
1780                 ("LDN(%x): %x type: %x lost: %x flags: %x overlay id: %x\n",
1781                  pinstance->ldn.hcam->ilid,
1782                  pinstance->ldn.hcam->op_code,
1783                  pinstance->ldn.hcam->notification_type,
1784                  pinstance->ldn.hcam->notification_lost,
1785                  pinstance->ldn.hcam->flags,
1786                  pinstance->ldn.hcam->overlay_id);
1787
1788         /* log only the errors, no need to log informational log entries */
1789         if (pinstance->ldn.hcam->notification_type !=
1790             NOTIFICATION_TYPE_ERROR_LOG)
1791                 return;
1792
1793         if (pinstance->ldn.hcam->notification_lost ==
1794             HOSTRCB_NOTIFICATIONS_LOST)
1795                 dev_info(&pinstance->pdev->dev, "Error notifications lost\n");
1796
1797         ioasc = le32_to_cpu(hcam_ldn->error_log.fd_ioasc);
1798
1799         if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
1800                 ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER) {
1801                 dev_info(&pinstance->pdev->dev,
1802                         "UnitAttention due to IOA Bus Reset\n");
1803                 scsi_report_bus_reset(
1804                         pinstance->host,
1805                         RES_BUS(hcam_ldn->error_log.fd_ra));
1806         }
1807
1808         return;
1809 }
1810
1811 /**
1812  * pmcraid_process_ccn - Op done function for a CCN.
1813  * @cmd: pointer to command struct
1814  *
1815  * This function is the op done function for a configuration
1816  * change notification
1817  *
1818  * Return value:
1819  * none
1820  */
1821 static void pmcraid_process_ccn(struct pmcraid_cmd *cmd)
1822 {
1823         struct pmcraid_instance *pinstance = cmd->drv_inst;
1824         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1825         unsigned long lock_flags;
1826
1827         pinstance->ccn.cmd = NULL;
1828         pmcraid_return_cmd(cmd);
1829
1830         /* If driver initiated IOA reset happened while this hcam was pending
1831          * with IOA, or IOA bringdown sequence is in progress, no need to
1832          * re-register the hcam
1833          */
1834         if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1835             atomic_read(&pinstance->ccn.ignore) == 1) {
1836                 return;
1837         } else if (ioasc) {
1838                 dev_info(&pinstance->pdev->dev,
1839                         "Host RCB (CCN) failed with IOASC: 0x%08X\n", ioasc);
1840                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
1841                 pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1842                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
1843         } else {
1844                 pmcraid_handle_config_change(pinstance);
1845         }
1846 }
1847
1848 /**
1849  * pmcraid_process_ldn - op done function for an LDN
1850  * @cmd: pointer to command block
1851  *
1852  * Return value
1853  *   none
1854  */
1855 static void pmcraid_initiate_reset(struct pmcraid_instance *);
1856 static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd);
1857
1858 static void pmcraid_process_ldn(struct pmcraid_cmd *cmd)
1859 {
1860         struct pmcraid_instance *pinstance = cmd->drv_inst;
1861         struct pmcraid_hcam_ldn *ldn_hcam =
1862                         (struct pmcraid_hcam_ldn *)pinstance->ldn.hcam;
1863         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
1864         u32 fd_ioasc = le32_to_cpu(ldn_hcam->error_log.fd_ioasc);
1865         unsigned long lock_flags;
1866
1867         /* return the command block back to freepool */
1868         pinstance->ldn.cmd = NULL;
1869         pmcraid_return_cmd(cmd);
1870
1871         /* If driver initiated IOA reset happened while this hcam was pending
1872          * with IOA, no need to re-register the hcam as reset engine will do it
1873          * once reset sequence is complete
1874          */
1875         if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
1876             atomic_read(&pinstance->ccn.ignore) == 1) {
1877                 return;
1878         } else if (!ioasc) {
1879                 pmcraid_handle_error_log(pinstance);
1880                 if (fd_ioasc == PMCRAID_IOASC_NR_IOA_RESET_REQUIRED) {
1881                         spin_lock_irqsave(pinstance->host->host_lock,
1882                                           lock_flags);
1883                         pmcraid_initiate_reset(pinstance);
1884                         spin_unlock_irqrestore(pinstance->host->host_lock,
1885                                                lock_flags);
1886                         return;
1887                 }
1888                 if (fd_ioasc == PMCRAID_IOASC_TIME_STAMP_OUT_OF_SYNC) {
1889                         pinstance->timestamp_error = 1;
1890                         pmcraid_set_timestamp(cmd);
1891                 }
1892         } else {
1893                 dev_info(&pinstance->pdev->dev,
1894                         "Host RCB(LDN) failed with IOASC: 0x%08X\n", ioasc);
1895         }
1896         /* send netlink message for HCAM notification if enabled */
1897         if (!pmcraid_disable_aen)
1898                 pmcraid_notify_ldn(pinstance);
1899
1900         cmd = pmcraid_init_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1901         if (cmd)
1902                 pmcraid_send_hcam_cmd(cmd);
1903 }
1904
1905 /**
1906  * pmcraid_register_hcams - register HCAMs for CCN and LDN
1907  *
1908  * @pinstance: pointer per adapter instance structure
1909  *
1910  * Return Value
1911  *   none
1912  */
1913 static void pmcraid_register_hcams(struct pmcraid_instance *pinstance)
1914 {
1915         pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_CONFIG_CHANGE);
1916         pmcraid_send_hcam(pinstance, PMCRAID_HCAM_CODE_LOG_DATA);
1917 }
1918
1919 /**
1920  * pmcraid_unregister_hcams - cancel HCAMs registered already
1921  * @cmd: pointer to command used as part of reset sequence
1922  */
1923 static void pmcraid_unregister_hcams(struct pmcraid_cmd *cmd)
1924 {
1925         struct pmcraid_instance *pinstance = cmd->drv_inst;
1926
1927         /* During IOA bringdown, HCAM gets fired and tasklet proceeds with
1928          * handling hcam response though it is not necessary. In order to
1929          * prevent this, set 'ignore', so that bring-down sequence doesn't
1930          * re-send any more hcams
1931          */
1932         atomic_set(&pinstance->ccn.ignore, 1);
1933         atomic_set(&pinstance->ldn.ignore, 1);
1934
1935         /* If adapter reset was forced as part of runtime reset sequence,
1936          * start the reset sequence. Reset will be triggered even in case
1937          * IOA unit_check.
1938          */
1939         if ((pinstance->force_ioa_reset && !pinstance->ioa_bringdown) ||
1940              pinstance->ioa_unit_check) {
1941                 pinstance->force_ioa_reset = 0;
1942                 pinstance->ioa_unit_check = 0;
1943                 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
1944                 pmcraid_reset_alert(cmd);
1945                 return;
1946         }
1947
1948         /* Driver tries to cancel HCAMs by sending ABORT TASK for each HCAM
1949          * one after the other. So CCN cancellation will be triggered by
1950          * pmcraid_cancel_ldn itself.
1951          */
1952         pmcraid_cancel_ldn(cmd);
1953 }
1954
1955 /**
1956  * pmcraid_reset_enable_ioa - re-enable IOA after a hard reset
1957  * @pinstance: pointer to adapter instance structure
1958  * Return Value
1959  *  1 if TRANSITION_TO_OPERATIONAL is active, otherwise 0
1960  */
1961 static void pmcraid_reinit_buffers(struct pmcraid_instance *);
1962
1963 static int pmcraid_reset_enable_ioa(struct pmcraid_instance *pinstance)
1964 {
1965         u32 intrs;
1966
1967         pmcraid_reinit_buffers(pinstance);
1968         intrs = pmcraid_read_interrupts(pinstance);
1969
1970         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
1971
1972         if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
1973                 if (!pinstance->interrupt_mode) {
1974                         iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1975                                 pinstance->int_regs.
1976                                 ioa_host_interrupt_mask_reg);
1977                         iowrite32(INTRS_TRANSITION_TO_OPERATIONAL,
1978                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
1979                 }
1980                 return 1;
1981         } else {
1982                 return 0;
1983         }
1984 }
1985
1986 /**
1987  * pmcraid_soft_reset - performs a soft reset and makes IOA become ready
1988  * @cmd : pointer to reset command block
1989  *
1990  * Return Value
1991  *      none
1992  */
1993 static void pmcraid_soft_reset(struct pmcraid_cmd *cmd)
1994 {
1995         struct pmcraid_instance *pinstance = cmd->drv_inst;
1996         u32 int_reg;
1997         u32 doorbell;
1998
1999         /* There will be an interrupt when Transition to Operational bit is
2000          * set so tasklet would execute next reset task. The timeout handler
2001          * would re-initiate a reset
2002          */
2003         cmd->cmd_done = pmcraid_ioa_reset;
2004         cmd->timer.data = (unsigned long)cmd;
2005         cmd->timer.expires = jiffies +
2006                              msecs_to_jiffies(PMCRAID_TRANSOP_TIMEOUT);
2007         cmd->timer.function = (void (*)(unsigned long))pmcraid_timeout_handler;
2008
2009         if (!timer_pending(&cmd->timer))
2010                 add_timer(&cmd->timer);
2011
2012         /* Enable destructive diagnostics on IOA if it is not yet in
2013          * operational state
2014          */
2015         doorbell = DOORBELL_RUNTIME_RESET |
2016                    DOORBELL_ENABLE_DESTRUCTIVE_DIAGS;
2017
2018         /* Since we do RESET_ALERT and Start BIST we have to again write
2019          * MSIX Doorbell to indicate the interrupt mode
2020          */
2021         if (pinstance->interrupt_mode) {
2022                 iowrite32(DOORBELL_INTR_MODE_MSIX,
2023                           pinstance->int_regs.host_ioa_interrupt_reg);
2024                 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
2025         }
2026
2027         iowrite32(doorbell, pinstance->int_regs.host_ioa_interrupt_reg);
2028         ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
2029         int_reg = ioread32(pinstance->int_regs.ioa_host_interrupt_reg);
2030
2031         pmcraid_info("Waiting for IOA to become operational %x:%x\n",
2032                      ioread32(pinstance->int_regs.host_ioa_interrupt_reg),
2033                      int_reg);
2034 }
2035
2036 /**
2037  * pmcraid_get_dump - retrieves IOA dump in case of Unit Check interrupt
2038  *
2039  * @pinstance: pointer to adapter instance structure
2040  *
2041  * Return Value
2042  *      none
2043  */
2044 static void pmcraid_get_dump(struct pmcraid_instance *pinstance)
2045 {
2046         pmcraid_info("%s is not yet implemented\n", __func__);
2047 }
2048
2049 /**
2050  * pmcraid_fail_outstanding_cmds - Fails all outstanding ops.
2051  * @pinstance: pointer to adapter instance structure
2052  *
2053  * This function fails all outstanding ops. If they are submitted to IOA
2054  * already, it sends cancel all messages if IOA is still accepting IOARCBs,
2055  * otherwise just completes the commands and returns the cmd blocks to free
2056  * pool.
2057  *
2058  * Return value:
2059  *       none
2060  */
2061 static void pmcraid_fail_outstanding_cmds(struct pmcraid_instance *pinstance)
2062 {
2063         struct pmcraid_cmd *cmd, *temp;
2064         unsigned long lock_flags;
2065
2066         /* pending command list is protected by pending_pool_lock. Its
2067          * traversal must be done as within this lock
2068          */
2069         spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2070         list_for_each_entry_safe(cmd, temp, &pinstance->pending_cmd_pool,
2071                                  free_list) {
2072                 list_del(&cmd->free_list);
2073                 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
2074                                         lock_flags);
2075                 cmd->ioa_cb->ioasa.ioasc =
2076                         cpu_to_le32(PMCRAID_IOASC_IOA_WAS_RESET);
2077                 cmd->ioa_cb->ioasa.ilid =
2078                         cpu_to_be32(PMCRAID_DRIVER_ILID);
2079
2080                 /* In case the command timer is still running */
2081                 del_timer(&cmd->timer);
2082
2083                 /* If this is an IO command, complete it by invoking scsi_done
2084                  * function. If this is one of the internal commands other
2085                  * than pmcraid_ioa_reset and HCAM commands invoke cmd_done to
2086                  * complete it
2087                  */
2088                 if (cmd->scsi_cmd) {
2089
2090                         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2091                         __le32 resp = cmd->ioa_cb->ioarcb.response_handle;
2092
2093                         scsi_cmd->result |= DID_ERROR << 16;
2094
2095                         scsi_dma_unmap(scsi_cmd);
2096                         pmcraid_return_cmd(cmd);
2097
2098                         pmcraid_info("failing(%d) CDB[0] = %x result: %x\n",
2099                                      le32_to_cpu(resp) >> 2,
2100                                      cmd->ioa_cb->ioarcb.cdb[0],
2101                                      scsi_cmd->result);
2102                         scsi_cmd->scsi_done(scsi_cmd);
2103                 } else if (cmd->cmd_done == pmcraid_internal_done ||
2104                            cmd->cmd_done == pmcraid_erp_done) {
2105                         cmd->cmd_done(cmd);
2106                 } else if (cmd->cmd_done != pmcraid_ioa_reset &&
2107                            cmd->cmd_done != pmcraid_ioa_shutdown_done) {
2108                         pmcraid_return_cmd(cmd);
2109                 }
2110
2111                 atomic_dec(&pinstance->outstanding_cmds);
2112                 spin_lock_irqsave(&pinstance->pending_pool_lock, lock_flags);
2113         }
2114
2115         spin_unlock_irqrestore(&pinstance->pending_pool_lock, lock_flags);
2116 }
2117
2118 /**
2119  * pmcraid_ioa_reset - Implementation of IOA reset logic
2120  *
2121  * @cmd: pointer to the cmd block to be used for entire reset process
2122  *
2123  * This function executes most of the steps required for IOA reset. This gets
2124  * called by user threads (modprobe/insmod/rmmod) timer, tasklet and midlayer's
2125  * 'eh_' thread. Access to variables used for controlling the reset sequence is
2126  * synchronized using host lock. Various functions called during reset process
2127  * would make use of a single command block, pointer to which is also stored in
2128  * adapter instance structure.
2129  *
2130  * Return Value
2131  *       None
2132  */
2133 static void pmcraid_ioa_reset(struct pmcraid_cmd *cmd)
2134 {
2135         struct pmcraid_instance *pinstance = cmd->drv_inst;
2136         u8 reset_complete = 0;
2137
2138         pinstance->ioa_reset_in_progress = 1;
2139
2140         if (pinstance->reset_cmd != cmd) {
2141                 pmcraid_err("reset is called with different command block\n");
2142                 pinstance->reset_cmd = cmd;
2143         }
2144
2145         pmcraid_info("reset_engine: state = %d, command = %p\n",
2146                       pinstance->ioa_state, cmd);
2147
2148         switch (pinstance->ioa_state) {
2149
2150         case IOA_STATE_DEAD:
2151                 /* If IOA is offline, whatever may be the reset reason, just
2152                  * return. callers might be waiting on the reset wait_q, wake
2153                  * up them
2154                  */
2155                 pmcraid_err("IOA is offline no reset is possible\n");
2156                 reset_complete = 1;
2157                 break;
2158
2159         case IOA_STATE_IN_BRINGDOWN:
2160                 /* we enter here, once ioa shutdown command is processed by IOA
2161                  * Alert IOA for a possible reset. If reset alert fails, IOA
2162                  * goes through hard-reset
2163                  */
2164                 pmcraid_disable_interrupts(pinstance, ~0);
2165                 pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2166                 pmcraid_reset_alert(cmd);
2167                 break;
2168
2169         case IOA_STATE_UNKNOWN:
2170                 /* We may be called during probe or resume. Some pre-processing
2171                  * is required for prior to reset
2172                  */
2173                 scsi_block_requests(pinstance->host);
2174
2175                 /* If asked to reset while IOA was processing responses or
2176                  * there are any error responses then IOA may require
2177                  * hard-reset.
2178                  */
2179                 if (pinstance->ioa_hard_reset == 0) {
2180                         if (ioread32(pinstance->ioa_status) &
2181                             INTRS_TRANSITION_TO_OPERATIONAL) {
2182                                 pmcraid_info("sticky bit set, bring-up\n");
2183                                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2184                                 pmcraid_reinit_cmdblk(cmd);
2185                                 pmcraid_identify_hrrq(cmd);
2186                         } else {
2187                                 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2188                                 pmcraid_soft_reset(cmd);
2189                         }
2190                 } else {
2191                         /* Alert IOA of a possible reset and wait for critical
2192                          * operation in progress bit to reset
2193                          */
2194                         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2195                         pmcraid_reset_alert(cmd);
2196                 }
2197                 break;
2198
2199         case IOA_STATE_IN_RESET_ALERT:
2200                 /* If critical operation in progress bit is reset or wait gets
2201                  * timed out, reset proceeds with starting BIST on the IOA.
2202                  * pmcraid_ioa_hard_reset keeps a count of reset attempts. If
2203                  * they are 3 or more, reset engine marks IOA dead and returns
2204                  */
2205                 pinstance->ioa_state = IOA_STATE_IN_HARD_RESET;
2206                 pmcraid_start_bist(cmd);
2207                 break;
2208
2209         case IOA_STATE_IN_HARD_RESET:
2210                 pinstance->ioa_reset_attempts++;
2211
2212                 /* retry reset if we haven't reached maximum allowed limit */
2213                 if (pinstance->ioa_reset_attempts > PMCRAID_RESET_ATTEMPTS) {
2214                         pinstance->ioa_reset_attempts = 0;
2215                         pmcraid_err("IOA didn't respond marking it as dead\n");
2216                         pinstance->ioa_state = IOA_STATE_DEAD;
2217
2218                         if (pinstance->ioa_bringdown)
2219                                 pmcraid_notify_ioastate(pinstance,
2220                                         PMC_DEVICE_EVENT_SHUTDOWN_FAILED);
2221                         else
2222                                 pmcraid_notify_ioastate(pinstance,
2223                                                 PMC_DEVICE_EVENT_RESET_FAILED);
2224                         reset_complete = 1;
2225                         break;
2226                 }
2227
2228                 /* Once either bist or pci reset is done, restore PCI config
2229                  * space. If this fails, proceed with hard reset again
2230                  */
2231                 pci_restore_state(pinstance->pdev);
2232
2233                 /* fail all pending commands */
2234                 pmcraid_fail_outstanding_cmds(pinstance);
2235
2236                 /* check if unit check is active, if so extract dump */
2237                 if (pinstance->ioa_unit_check) {
2238                         pmcraid_info("unit check is active\n");
2239                         pinstance->ioa_unit_check = 0;
2240                         pmcraid_get_dump(pinstance);
2241                         pinstance->ioa_reset_attempts--;
2242                         pinstance->ioa_state = IOA_STATE_IN_RESET_ALERT;
2243                         pmcraid_reset_alert(cmd);
2244                         break;
2245                 }
2246
2247                 /* if the reset reason is to bring-down the ioa, we might be
2248                  * done with the reset restore pci_config_space and complete
2249                  * the reset
2250                  */
2251                 if (pinstance->ioa_bringdown) {
2252                         pmcraid_info("bringing down the adapter\n");
2253                         pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2254                         pinstance->ioa_bringdown = 0;
2255                         pinstance->ioa_state = IOA_STATE_UNKNOWN;
2256                         pmcraid_notify_ioastate(pinstance,
2257                                         PMC_DEVICE_EVENT_SHUTDOWN_SUCCESS);
2258                         reset_complete = 1;
2259                 } else {
2260                         /* bring-up IOA, so proceed with soft reset
2261                          * Reinitialize hrrq_buffers and their indices also
2262                          * enable interrupts after a pci_restore_state
2263                          */
2264                         if (pmcraid_reset_enable_ioa(pinstance)) {
2265                                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2266                                 pmcraid_info("bringing up the adapter\n");
2267                                 pmcraid_reinit_cmdblk(cmd);
2268                                 pmcraid_identify_hrrq(cmd);
2269                         } else {
2270                                 pinstance->ioa_state = IOA_STATE_IN_SOFT_RESET;
2271                                 pmcraid_soft_reset(cmd);
2272                         }
2273                 }
2274                 break;
2275
2276         case IOA_STATE_IN_SOFT_RESET:
2277                 /* TRANSITION TO OPERATIONAL is on so start initialization
2278                  * sequence
2279                  */
2280                 pmcraid_info("In softreset proceeding with bring-up\n");
2281                 pinstance->ioa_state = IOA_STATE_IN_BRINGUP;
2282
2283                 /* Initialization commands start with HRRQ identification. From
2284                  * now on tasklet completes most of the commands as IOA is up
2285                  * and intrs are enabled
2286                  */
2287                 pmcraid_identify_hrrq(cmd);
2288                 break;
2289
2290         case IOA_STATE_IN_BRINGUP:
2291                 /* we are done with bringing up of IOA, change the ioa_state to
2292                  * operational and wake up any waiters
2293                  */
2294                 pinstance->ioa_state = IOA_STATE_OPERATIONAL;
2295                 reset_complete = 1;
2296                 break;
2297
2298         case IOA_STATE_OPERATIONAL:
2299         default:
2300                 /* When IOA is operational and a reset is requested, check for
2301                  * the reset reason. If reset is to bring down IOA, unregister
2302                  * HCAMs and initiate shutdown; if adapter reset is forced then
2303                  * restart reset sequence again
2304                  */
2305                 if (pinstance->ioa_shutdown_type == SHUTDOWN_NONE &&
2306                     pinstance->force_ioa_reset == 0) {
2307                         pmcraid_notify_ioastate(pinstance,
2308                                                 PMC_DEVICE_EVENT_RESET_SUCCESS);
2309                         reset_complete = 1;
2310                 } else {
2311                         if (pinstance->ioa_shutdown_type != SHUTDOWN_NONE)
2312                                 pinstance->ioa_state = IOA_STATE_IN_BRINGDOWN;
2313                         pmcraid_reinit_cmdblk(cmd);
2314                         pmcraid_unregister_hcams(cmd);
2315                 }
2316                 break;
2317         }
2318
2319         /* reset will be completed if ioa_state is either DEAD or UNKNOWN or
2320          * OPERATIONAL. Reset all control variables used during reset, wake up
2321          * any waiting threads and let the SCSI mid-layer send commands. Note
2322          * that host_lock must be held before invoking scsi_report_bus_reset.
2323          */
2324         if (reset_complete) {
2325                 pinstance->ioa_reset_in_progress = 0;
2326                 pinstance->ioa_reset_attempts = 0;
2327                 pinstance->reset_cmd = NULL;
2328                 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2329                 pinstance->ioa_bringdown = 0;
2330                 pmcraid_return_cmd(cmd);
2331
2332                 /* If target state is to bring up the adapter, proceed with
2333                  * hcam registration and resource exposure to mid-layer.
2334                  */
2335                 if (pinstance->ioa_state == IOA_STATE_OPERATIONAL)
2336                         pmcraid_register_hcams(pinstance);
2337
2338                 wake_up_all(&pinstance->reset_wait_q);
2339         }
2340
2341         return;
2342 }
2343
2344 /**
2345  * pmcraid_initiate_reset - initiates reset sequence. This is called from
2346  * ISR/tasklet during error interrupts including IOA unit check. If reset
2347  * is already in progress, it just returns, otherwise initiates IOA reset
2348  * to bring IOA up to operational state.
2349  *
2350  * @pinstance: pointer to adapter instance structure
2351  *
2352  * Return value
2353  *       none
2354  */
2355 static void pmcraid_initiate_reset(struct pmcraid_instance *pinstance)
2356 {
2357         struct pmcraid_cmd *cmd;
2358
2359         /* If the reset is already in progress, just return, otherwise start
2360          * reset sequence and return
2361          */
2362         if (!pinstance->ioa_reset_in_progress) {
2363                 scsi_block_requests(pinstance->host);
2364                 cmd = pmcraid_get_free_cmd(pinstance);
2365
2366                 if (cmd == NULL) {
2367                         pmcraid_err("no cmnd blocks for initiate_reset\n");
2368                         return;
2369                 }
2370
2371                 pinstance->ioa_shutdown_type = SHUTDOWN_NONE;
2372                 pinstance->reset_cmd = cmd;
2373                 pinstance->force_ioa_reset = 1;
2374                 pmcraid_notify_ioastate(pinstance,
2375                                         PMC_DEVICE_EVENT_RESET_START);
2376                 pmcraid_ioa_reset(cmd);
2377         }
2378 }
2379
2380 /**
2381  * pmcraid_reset_reload - utility routine for doing IOA reset either to bringup
2382  *                        or bringdown IOA
2383  * @pinstance: pointer adapter instance structure
2384  * @shutdown_type: shutdown type to be used NONE, NORMAL or ABRREV
2385  * @target_state: expected target state after reset
2386  *
2387  * Note: This command initiates reset and waits for its completion. Hence this
2388  * should not be called from isr/timer/tasklet functions (timeout handlers,
2389  * error response handlers and interrupt handlers).
2390  *
2391  * Return Value
2392  *       1 in case ioa_state is not target_state, 0 otherwise.
2393  */
2394 static int pmcraid_reset_reload(
2395         struct pmcraid_instance *pinstance,
2396         u8 shutdown_type,
2397         u8 target_state
2398 )
2399 {
2400         struct pmcraid_cmd *reset_cmd = NULL;
2401         unsigned long lock_flags;
2402         int reset = 1;
2403
2404         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2405
2406         if (pinstance->ioa_reset_in_progress) {
2407                 pmcraid_info("reset_reload: reset is already in progress\n");
2408
2409                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2410
2411                 wait_event(pinstance->reset_wait_q,
2412                            !pinstance->ioa_reset_in_progress);
2413
2414                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2415
2416                 if (pinstance->ioa_state == IOA_STATE_DEAD) {
2417                         spin_unlock_irqrestore(pinstance->host->host_lock,
2418                                                lock_flags);
2419                         pmcraid_info("reset_reload: IOA is dead\n");
2420                         return reset;
2421                 } else if (pinstance->ioa_state == target_state) {
2422                         reset = 0;
2423                 }
2424         }
2425
2426         if (reset) {
2427                 pmcraid_info("reset_reload: proceeding with reset\n");
2428                 scsi_block_requests(pinstance->host);
2429                 reset_cmd = pmcraid_get_free_cmd(pinstance);
2430
2431                 if (reset_cmd == NULL) {
2432                         pmcraid_err("no free cmnd for reset_reload\n");
2433                         spin_unlock_irqrestore(pinstance->host->host_lock,
2434                                                lock_flags);
2435                         return reset;
2436                 }
2437
2438                 if (shutdown_type == SHUTDOWN_NORMAL)
2439                         pinstance->ioa_bringdown = 1;
2440
2441                 pinstance->ioa_shutdown_type = shutdown_type;
2442                 pinstance->reset_cmd = reset_cmd;
2443                 pinstance->force_ioa_reset = reset;
2444                 pmcraid_info("reset_reload: initiating reset\n");
2445                 pmcraid_ioa_reset(reset_cmd);
2446                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2447                 pmcraid_info("reset_reload: waiting for reset to complete\n");
2448                 wait_event(pinstance->reset_wait_q,
2449                            !pinstance->ioa_reset_in_progress);
2450
2451                 pmcraid_info("reset_reload: reset is complete !!\n");
2452                 scsi_unblock_requests(pinstance->host);
2453                 if (pinstance->ioa_state == target_state)
2454                         reset = 0;
2455         }
2456
2457         return reset;
2458 }
2459
2460 /**
2461  * pmcraid_reset_bringdown - wrapper over pmcraid_reset_reload to bringdown IOA
2462  *
2463  * @pinstance: pointer to adapter instance structure
2464  *
2465  * Return Value
2466  *       whatever is returned from pmcraid_reset_reload
2467  */
2468 static int pmcraid_reset_bringdown(struct pmcraid_instance *pinstance)
2469 {
2470         return pmcraid_reset_reload(pinstance,
2471                                     SHUTDOWN_NORMAL,
2472                                     IOA_STATE_UNKNOWN);
2473 }
2474
2475 /**
2476  * pmcraid_reset_bringup - wrapper over pmcraid_reset_reload to bring up IOA
2477  *
2478  * @pinstance: pointer to adapter instance structure
2479  *
2480  * Return Value
2481  *       whatever is returned from pmcraid_reset_reload
2482  */
2483 static int pmcraid_reset_bringup(struct pmcraid_instance *pinstance)
2484 {
2485         pmcraid_notify_ioastate(pinstance, PMC_DEVICE_EVENT_RESET_START);
2486
2487         return pmcraid_reset_reload(pinstance,
2488                                     SHUTDOWN_NONE,
2489                                     IOA_STATE_OPERATIONAL);
2490 }
2491
2492 /**
2493  * pmcraid_request_sense - Send request sense to a device
2494  * @cmd: pmcraid command struct
2495  *
2496  * This function sends a request sense to a device as a result of a check
2497  * condition. This method re-uses the same command block that failed earlier.
2498  */
2499 static void pmcraid_request_sense(struct pmcraid_cmd *cmd)
2500 {
2501         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2502         struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
2503
2504         /* allocate DMAable memory for sense buffers */
2505         cmd->sense_buffer = pci_alloc_consistent(cmd->drv_inst->pdev,
2506                                                  SCSI_SENSE_BUFFERSIZE,
2507                                                  &cmd->sense_buffer_dma);
2508
2509         if (cmd->sense_buffer == NULL) {
2510                 pmcraid_err
2511                         ("couldn't allocate sense buffer for request sense\n");
2512                 pmcraid_erp_done(cmd);
2513                 return;
2514         }
2515
2516         /* re-use the command block */
2517         memset(&cmd->ioa_cb->ioasa, 0, sizeof(struct pmcraid_ioasa));
2518         memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2519         ioarcb->request_flags0 = (SYNC_COMPLETE |
2520                                   NO_LINK_DESCS |
2521                                   INHIBIT_UL_CHECK);
2522         ioarcb->request_type = REQ_TYPE_SCSI;
2523         ioarcb->cdb[0] = REQUEST_SENSE;
2524         ioarcb->cdb[4] = SCSI_SENSE_BUFFERSIZE;
2525
2526         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
2527                                         offsetof(struct pmcraid_ioarcb,
2528                                                 add_data.u.ioadl[0]));
2529         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
2530
2531         ioarcb->data_transfer_length = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2532
2533         ioadl->address = cpu_to_le64(cmd->sense_buffer_dma);
2534         ioadl->data_len = cpu_to_le32(SCSI_SENSE_BUFFERSIZE);
2535         ioadl->flags = IOADL_FLAGS_LAST_DESC;
2536
2537         /* request sense might be called as part of error response processing
2538          * which runs in tasklets context. It is possible that mid-layer might
2539          * schedule queuecommand during this time, hence, writting to IOARRIN
2540          * must be protect by host_lock
2541          */
2542         pmcraid_send_cmd(cmd, pmcraid_erp_done,
2543                          PMCRAID_REQUEST_SENSE_TIMEOUT,
2544                          pmcraid_timeout_handler);
2545 }
2546
2547 /**
2548  * pmcraid_cancel_all - cancel all outstanding IOARCBs as part of error recovery
2549  * @cmd: command that failed
2550  * @sense: true if request_sense is required after cancel all
2551  *
2552  * This function sends a cancel all to a device to clear the queue.
2553  */
2554 static void pmcraid_cancel_all(struct pmcraid_cmd *cmd, u32 sense)
2555 {
2556         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2557         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
2558         struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2559         void (*cmd_done) (struct pmcraid_cmd *) = sense ? pmcraid_erp_done
2560                                                         : pmcraid_request_sense;
2561
2562         memset(ioarcb->cdb, 0, PMCRAID_MAX_CDB_LEN);
2563         ioarcb->request_flags0 = SYNC_OVERRIDE;
2564         ioarcb->request_type = REQ_TYPE_IOACMD;
2565         ioarcb->cdb[0] = PMCRAID_CANCEL_ALL_REQUESTS;
2566
2567         if (RES_IS_GSCSI(res->cfg_entry))
2568                 ioarcb->cdb[1] = PMCRAID_SYNC_COMPLETE_AFTER_CANCEL;
2569
2570         ioarcb->ioadl_bus_addr = 0;
2571         ioarcb->ioadl_length = 0;
2572         ioarcb->data_transfer_length = 0;
2573         ioarcb->ioarcb_bus_addr &= (~0x1FULL);
2574
2575         /* writing to IOARRIN must be protected by host_lock, as mid-layer
2576          * schedule queuecommand while we are doing this
2577          */
2578         pmcraid_send_cmd(cmd, cmd_done,
2579                          PMCRAID_REQUEST_SENSE_TIMEOUT,
2580                          pmcraid_timeout_handler);
2581 }
2582
2583 /**
2584  * pmcraid_frame_auto_sense: frame fixed format sense information
2585  *
2586  * @cmd: pointer to failing command block
2587  *
2588  * Return value
2589  *  none
2590  */
2591 static void pmcraid_frame_auto_sense(struct pmcraid_cmd *cmd)
2592 {
2593         u8 *sense_buf = cmd->scsi_cmd->sense_buffer;
2594         struct pmcraid_resource_entry *res = cmd->scsi_cmd->device->hostdata;
2595         struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2596         u32 ioasc = le32_to_cpu(ioasa->ioasc);
2597         u32 failing_lba = 0;
2598
2599         memset(sense_buf, 0, SCSI_SENSE_BUFFERSIZE);
2600         cmd->scsi_cmd->result = SAM_STAT_CHECK_CONDITION;
2601
2602         if (RES_IS_VSET(res->cfg_entry) &&
2603             ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC &&
2604             ioasa->u.vset.failing_lba_hi != 0) {
2605
2606                 sense_buf[0] = 0x72;
2607                 sense_buf[1] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2608                 sense_buf[2] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2609                 sense_buf[3] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2610
2611                 sense_buf[7] = 12;
2612                 sense_buf[8] = 0;
2613                 sense_buf[9] = 0x0A;
2614                 sense_buf[10] = 0x80;
2615
2616                 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_hi);
2617
2618                 sense_buf[12] = (failing_lba & 0xff000000) >> 24;
2619                 sense_buf[13] = (failing_lba & 0x00ff0000) >> 16;
2620                 sense_buf[14] = (failing_lba & 0x0000ff00) >> 8;
2621                 sense_buf[15] = failing_lba & 0x000000ff;
2622
2623                 failing_lba = le32_to_cpu(ioasa->u.vset.failing_lba_lo);
2624
2625                 sense_buf[16] = (failing_lba & 0xff000000) >> 24;
2626                 sense_buf[17] = (failing_lba & 0x00ff0000) >> 16;
2627                 sense_buf[18] = (failing_lba & 0x0000ff00) >> 8;
2628                 sense_buf[19] = failing_lba & 0x000000ff;
2629         } else {
2630                 sense_buf[0] = 0x70;
2631                 sense_buf[2] = PMCRAID_IOASC_SENSE_KEY(ioasc);
2632                 sense_buf[12] = PMCRAID_IOASC_SENSE_CODE(ioasc);
2633                 sense_buf[13] = PMCRAID_IOASC_SENSE_QUAL(ioasc);
2634
2635                 if (ioasc == PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC) {
2636                         if (RES_IS_VSET(res->cfg_entry))
2637                                 failing_lba =
2638                                         le32_to_cpu(ioasa->u.
2639                                                  vset.failing_lba_lo);
2640                         sense_buf[0] |= 0x80;
2641                         sense_buf[3] = (failing_lba >> 24) & 0xff;
2642                         sense_buf[4] = (failing_lba >> 16) & 0xff;
2643                         sense_buf[5] = (failing_lba >> 8) & 0xff;
2644                         sense_buf[6] = failing_lba & 0xff;
2645                 }
2646
2647                 sense_buf[7] = 6; /* additional length */
2648         }
2649 }
2650
2651 /**
2652  * pmcraid_error_handler - Error response handlers for a SCSI op
2653  * @cmd: pointer to pmcraid_cmd that has failed
2654  *
2655  * This function determines whether or not to initiate ERP on the affected
2656  * device. This is called from a tasklet, which doesn't hold any locks.
2657  *
2658  * Return value:
2659  *       0 it caller can complete the request, otherwise 1 where in error
2660  *       handler itself completes the request and returns the command block
2661  *       back to free-pool
2662  */
2663 static int pmcraid_error_handler(struct pmcraid_cmd *cmd)
2664 {
2665         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2666         struct pmcraid_resource_entry *res = scsi_cmd->device->hostdata;
2667         struct pmcraid_instance *pinstance = cmd->drv_inst;
2668         struct pmcraid_ioasa *ioasa = &cmd->ioa_cb->ioasa;
2669         u32 ioasc = le32_to_cpu(ioasa->ioasc);
2670         u32 masked_ioasc = ioasc & PMCRAID_IOASC_SENSE_MASK;
2671         u32 sense_copied = 0;
2672
2673         if (!res) {
2674                 pmcraid_info("resource pointer is NULL\n");
2675                 return 0;
2676         }
2677
2678         /* If this was a SCSI read/write command keep count of errors */
2679         if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_READ_CMD)
2680                 atomic_inc(&res->read_failures);
2681         else if (SCSI_CMD_TYPE(scsi_cmd->cmnd[0]) == SCSI_WRITE_CMD)
2682                 atomic_inc(&res->write_failures);
2683
2684         if (!RES_IS_GSCSI(res->cfg_entry) &&
2685                 masked_ioasc != PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR) {
2686                 pmcraid_frame_auto_sense(cmd);
2687         }
2688
2689         /* Log IOASC/IOASA information based on user settings */
2690         pmcraid_ioasc_logger(ioasc, cmd);
2691
2692         switch (masked_ioasc) {
2693
2694         case PMCRAID_IOASC_AC_TERMINATED_BY_HOST:
2695                 scsi_cmd->result |= (DID_ABORT << 16);
2696                 break;
2697
2698         case PMCRAID_IOASC_IR_INVALID_RESOURCE_HANDLE:
2699         case PMCRAID_IOASC_HW_CANNOT_COMMUNICATE:
2700                 scsi_cmd->result |= (DID_NO_CONNECT << 16);
2701                 break;
2702
2703         case PMCRAID_IOASC_NR_SYNC_REQUIRED:
2704                 res->sync_reqd = 1;
2705                 scsi_cmd->result |= (DID_IMM_RETRY << 16);
2706                 break;
2707
2708         case PMCRAID_IOASC_ME_READ_ERROR_NO_REALLOC:
2709                 scsi_cmd->result |= (DID_PASSTHROUGH << 16);
2710                 break;
2711
2712         case PMCRAID_IOASC_UA_BUS_WAS_RESET:
2713         case PMCRAID_IOASC_UA_BUS_WAS_RESET_BY_OTHER:
2714                 if (!res->reset_progress)
2715                         scsi_report_bus_reset(pinstance->host,
2716                                               scsi_cmd->device->channel);
2717                 scsi_cmd->result |= (DID_ERROR << 16);
2718                 break;
2719
2720         case PMCRAID_IOASC_HW_DEVICE_BUS_STATUS_ERROR:
2721                 scsi_cmd->result |= PMCRAID_IOASC_SENSE_STATUS(ioasc);
2722                 res->sync_reqd = 1;
2723
2724                 /* if check_condition is not active return with error otherwise
2725                  * get/frame the sense buffer
2726                  */
2727                 if (PMCRAID_IOASC_SENSE_STATUS(ioasc) !=
2728                     SAM_STAT_CHECK_CONDITION &&
2729                     PMCRAID_IOASC_SENSE_STATUS(ioasc) != SAM_STAT_ACA_ACTIVE)
2730                         return 0;
2731
2732                 /* If we have auto sense data as part of IOASA pass it to
2733                  * mid-layer
2734                  */
2735                 if (ioasa->auto_sense_length != 0) {
2736                         short sense_len = ioasa->auto_sense_length;
2737                         int data_size = min_t(u16, le16_to_cpu(sense_len),
2738                                               SCSI_SENSE_BUFFERSIZE);
2739
2740                         memcpy(scsi_cmd->sense_buffer,
2741                                ioasa->sense_data,
2742                                data_size);
2743                         sense_copied = 1;
2744                 }
2745
2746                 if (RES_IS_GSCSI(res->cfg_entry))
2747                         pmcraid_cancel_all(cmd, sense_copied);
2748                 else if (sense_copied)
2749                         pmcraid_erp_done(cmd);
2750                 else
2751                         pmcraid_request_sense(cmd);
2752
2753                 return 1;
2754
2755         case PMCRAID_IOASC_NR_INIT_CMD_REQUIRED:
2756                 break;
2757
2758         default:
2759                 if (PMCRAID_IOASC_SENSE_KEY(ioasc) > RECOVERED_ERROR)
2760                         scsi_cmd->result |= (DID_ERROR << 16);
2761                 break;
2762         }
2763         return 0;
2764 }
2765
2766 /**
2767  * pmcraid_reset_device - device reset handler functions
2768  *
2769  * @scsi_cmd: scsi command struct
2770  * @modifier: reset modifier indicating the reset sequence to be performed
2771  *
2772  * This function issues a device reset to the affected device.
2773  * A LUN reset will be sent to the device first. If that does
2774  * not work, a target reset will be sent.
2775  *
2776  * Return value:
2777  *      SUCCESS / FAILED
2778  */
2779 static int pmcraid_reset_device(
2780         struct scsi_cmnd *scsi_cmd,
2781         unsigned long timeout,
2782         u8 modifier
2783 )
2784 {
2785         struct pmcraid_cmd *cmd;
2786         struct pmcraid_instance *pinstance;
2787         struct pmcraid_resource_entry *res;
2788         struct pmcraid_ioarcb *ioarcb;
2789         unsigned long lock_flags;
2790         u32 ioasc;
2791
2792         pinstance =
2793                 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
2794         res = scsi_cmd->device->hostdata;
2795
2796         if (!res) {
2797                 sdev_printk(KERN_ERR, scsi_cmd->device,
2798                             "reset_device: NULL resource pointer\n");
2799                 return FAILED;
2800         }
2801
2802         /* If adapter is currently going through reset/reload, return failed.
2803          * This will force the mid-layer to call _eh_bus/host reset, which
2804          * will then go to sleep and wait for the reset to complete
2805          */
2806         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
2807         if (pinstance->ioa_reset_in_progress ||
2808             pinstance->ioa_state == IOA_STATE_DEAD) {
2809                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2810                 return FAILED;
2811         }
2812
2813         res->reset_progress = 1;
2814         pmcraid_info("Resetting %s resource with addr %x\n",
2815                      ((modifier & RESET_DEVICE_LUN) ? "LUN" :
2816                      ((modifier & RESET_DEVICE_TARGET) ? "TARGET" : "BUS")),
2817                      le32_to_cpu(res->cfg_entry.resource_address));
2818
2819         /* get a free cmd block */
2820         cmd = pmcraid_get_free_cmd(pinstance);
2821
2822         if (cmd == NULL) {
2823                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2824                 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2825                 return FAILED;
2826         }
2827
2828         ioarcb = &cmd->ioa_cb->ioarcb;
2829         ioarcb->resource_handle = res->cfg_entry.resource_handle;
2830         ioarcb->request_type = REQ_TYPE_IOACMD;
2831         ioarcb->cdb[0] = PMCRAID_RESET_DEVICE;
2832
2833         /* Initialize reset modifier bits */
2834         if (modifier)
2835                 modifier = ENABLE_RESET_MODIFIER | modifier;
2836
2837         ioarcb->cdb[1] = modifier;
2838
2839         init_completion(&cmd->wait_for_completion);
2840         cmd->completion_req = 1;
2841
2842         pmcraid_info("cmd(CDB[0] = %x) for %x with index = %d\n",
2843                      cmd->ioa_cb->ioarcb.cdb[0],
2844                      le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle),
2845                      le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2);
2846
2847         pmcraid_send_cmd(cmd,
2848                          pmcraid_internal_done,
2849                          timeout,
2850                          pmcraid_timeout_handler);
2851
2852         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
2853
2854         /* RESET_DEVICE command completes after all pending IOARCBs are
2855          * completed. Once this command is completed, pmcraind_internal_done
2856          * will wake up the 'completion' queue.
2857          */
2858         wait_for_completion(&cmd->wait_for_completion);
2859
2860         /* complete the command here itself and return the command block
2861          * to free list
2862          */
2863         pmcraid_return_cmd(cmd);
2864         res->reset_progress = 0;
2865         ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2866
2867         /* set the return value based on the returned ioasc */
2868         return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
2869 }
2870
2871 /**
2872  * _pmcraid_io_done - helper for pmcraid_io_done function
2873  *
2874  * @cmd: pointer to pmcraid command struct
2875  * @reslen: residual data length to be set in the ioasa
2876  * @ioasc: ioasc either returned by IOA or set by driver itself.
2877  *
2878  * This function is invoked by pmcraid_io_done to complete mid-layer
2879  * scsi ops.
2880  *
2881  * Return value:
2882  *        0 if caller is required to return it to free_pool. Returns 1 if
2883  *        caller need not worry about freeing command block as error handler
2884  *        will take care of that.
2885  */
2886
2887 static int _pmcraid_io_done(struct pmcraid_cmd *cmd, int reslen, int ioasc)
2888 {
2889         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
2890         int rc = 0;
2891
2892         scsi_set_resid(scsi_cmd, reslen);
2893
2894         pmcraid_info("response(%d) CDB[0] = %x ioasc:result: %x:%x\n",
2895                 le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
2896                 cmd->ioa_cb->ioarcb.cdb[0],
2897                 ioasc, scsi_cmd->result);
2898
2899         if (PMCRAID_IOASC_SENSE_KEY(ioasc) != 0)
2900                 rc = pmcraid_error_handler(cmd);
2901
2902         if (rc == 0) {
2903                 scsi_dma_unmap(scsi_cmd);
2904                 scsi_cmd->scsi_done(scsi_cmd);
2905         }
2906
2907         return rc;
2908 }
2909
2910 /**
2911  * pmcraid_io_done - SCSI completion function
2912  *
2913  * @cmd: pointer to pmcraid command struct
2914  *
2915  * This function is invoked by tasklet/mid-layer error handler to completing
2916  * the SCSI ops sent from mid-layer.
2917  *
2918  * Return value
2919  *        none
2920  */
2921
2922 static void pmcraid_io_done(struct pmcraid_cmd *cmd)
2923 {
2924         u32 ioasc = le32_to_cpu(cmd->ioa_cb->ioasa.ioasc);
2925         u32 reslen = le32_to_cpu(cmd->ioa_cb->ioasa.residual_data_length);
2926
2927         if (_pmcraid_io_done(cmd, reslen, ioasc) == 0)
2928                 pmcraid_return_cmd(cmd);
2929 }
2930
2931 /**
2932  * pmcraid_abort_cmd - Aborts a single IOARCB already submitted to IOA
2933  *
2934  * @cmd: command block of the command to be aborted
2935  *
2936  * Return Value:
2937  *       returns pointer to command structure used as cancelling cmd
2938  */
2939 static struct pmcraid_cmd *pmcraid_abort_cmd(struct pmcraid_cmd *cmd)
2940 {
2941         struct pmcraid_cmd *cancel_cmd;
2942         struct pmcraid_instance *pinstance;
2943         struct pmcraid_resource_entry *res;
2944
2945         pinstance = (struct pmcraid_instance *)cmd->drv_inst;
2946         res = cmd->scsi_cmd->device->hostdata;
2947
2948         cancel_cmd = pmcraid_get_free_cmd(pinstance);
2949
2950         if (cancel_cmd == NULL) {
2951                 pmcraid_err("%s: no cmd blocks are available\n", __func__);
2952                 return NULL;
2953         }
2954
2955         pmcraid_prepare_cancel_cmd(cancel_cmd, cmd);
2956
2957         pmcraid_info("aborting command CDB[0]= %x with index = %d\n",
2958                 cmd->ioa_cb->ioarcb.cdb[0],
2959                 cmd->ioa_cb->ioarcb.response_handle >> 2);
2960
2961         init_completion(&cancel_cmd->wait_for_completion);
2962         cancel_cmd->completion_req = 1;
2963
2964         pmcraid_info("command (%d) CDB[0] = %x for %x\n",
2965                 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.response_handle) >> 2,
2966                 cancel_cmd->ioa_cb->ioarcb.cdb[0],
2967                 le32_to_cpu(cancel_cmd->ioa_cb->ioarcb.resource_handle));
2968
2969         pmcraid_send_cmd(cancel_cmd,
2970                          pmcraid_internal_done,
2971                          PMCRAID_INTERNAL_TIMEOUT,
2972                          pmcraid_timeout_handler);
2973         return cancel_cmd;
2974 }
2975
2976 /**
2977  * pmcraid_abort_complete - Waits for ABORT TASK completion
2978  *
2979  * @cancel_cmd: command block use as cancelling command
2980  *
2981  * Return Value:
2982  *       returns SUCCESS if ABORT TASK has good completion
2983  *       otherwise FAILED
2984  */
2985 static int pmcraid_abort_complete(struct pmcraid_cmd *cancel_cmd)
2986 {
2987         struct pmcraid_resource_entry *res;
2988         u32 ioasc;
2989
2990         wait_for_completion(&cancel_cmd->wait_for_completion);
2991         res = cancel_cmd->res;
2992         cancel_cmd->res = NULL;
2993         ioasc = le32_to_cpu(cancel_cmd->ioa_cb->ioasa.ioasc);
2994
2995         /* If the abort task is not timed out we will get a Good completion
2996          * as sense_key, otherwise we may get one the following responses
2997          * due to subsequent bus reset or device reset. In case IOASC is
2998          * NR_SYNC_REQUIRED, set sync_reqd flag for the corresponding resource
2999          */
3000         if (ioasc == PMCRAID_IOASC_UA_BUS_WAS_RESET ||
3001             ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED) {
3002                 if (ioasc == PMCRAID_IOASC_NR_SYNC_REQUIRED)
3003                         res->sync_reqd = 1;
3004                 ioasc = 0;
3005         }
3006
3007         /* complete the command here itself */
3008         pmcraid_return_cmd(cancel_cmd);
3009         return PMCRAID_IOASC_SENSE_KEY(ioasc) ? FAILED : SUCCESS;
3010 }
3011
3012 /**
3013  * pmcraid_eh_abort_handler - entry point for aborting a single task on errors
3014  *
3015  * @scsi_cmd:   scsi command struct given by mid-layer. When this is called
3016  *              mid-layer ensures that no other commands are queued. This
3017  *              never gets called under interrupt, but a separate eh thread.
3018  *
3019  * Return value:
3020  *       SUCCESS / FAILED
3021  */
3022 static int pmcraid_eh_abort_handler(struct scsi_cmnd *scsi_cmd)
3023 {
3024         struct pmcraid_instance *pinstance;
3025         struct pmcraid_cmd *cmd;
3026         struct pmcraid_resource_entry *res;
3027         unsigned long host_lock_flags;
3028         unsigned long pending_lock_flags;
3029         struct pmcraid_cmd *cancel_cmd = NULL;
3030         int cmd_found = 0;
3031         int rc = FAILED;
3032
3033         pinstance =
3034                 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3035
3036         scmd_printk(KERN_INFO, scsi_cmd,
3037                     "I/O command timed out, aborting it.\n");
3038
3039         res = scsi_cmd->device->hostdata;
3040
3041         if (res == NULL)
3042                 return rc;
3043
3044         /* If we are currently going through reset/reload, return failed.
3045          * This will force the mid-layer to eventually call
3046          * pmcraid_eh_host_reset which will then go to sleep and wait for the
3047          * reset to complete
3048          */
3049         spin_lock_irqsave(pinstance->host->host_lock, host_lock_flags);
3050
3051         if (pinstance->ioa_reset_in_progress ||
3052             pinstance->ioa_state == IOA_STATE_DEAD) {
3053                 spin_unlock_irqrestore(pinstance->host->host_lock,
3054                                        host_lock_flags);
3055                 return rc;
3056         }
3057
3058         /* loop over pending cmd list to find cmd corresponding to this
3059          * scsi_cmd. Note that this command might not have been completed
3060          * already. locking: all pending commands are protected with
3061          * pending_pool_lock.
3062          */
3063         spin_lock_irqsave(&pinstance->pending_pool_lock, pending_lock_flags);
3064         list_for_each_entry(cmd, &pinstance->pending_cmd_pool, free_list) {
3065
3066                 if (cmd->scsi_cmd == scsi_cmd) {
3067                         cmd_found = 1;
3068                         break;
3069                 }
3070         }
3071
3072         spin_unlock_irqrestore(&pinstance->pending_pool_lock,
3073                                 pending_lock_flags);
3074
3075         /* If the command to be aborted was given to IOA and still pending with
3076          * it, send ABORT_TASK to abort this and wait for its completion
3077          */
3078         if (cmd_found)
3079                 cancel_cmd = pmcraid_abort_cmd(cmd);
3080
3081         spin_unlock_irqrestore(pinstance->host->host_lock,
3082                                host_lock_flags);
3083
3084         if (cancel_cmd) {
3085                 cancel_cmd->res = cmd->scsi_cmd->device->hostdata;
3086                 rc = pmcraid_abort_complete(cancel_cmd);
3087         }
3088
3089         return cmd_found ? rc : SUCCESS;
3090 }
3091
3092 /**
3093  * pmcraid_eh_xxxx_reset_handler - bus/target/device reset handler callbacks
3094  *
3095  * @scmd: pointer to scsi_cmd that was sent to the resource to be reset.
3096  *
3097  * All these routines invokve pmcraid_reset_device with appropriate parameters.
3098  * Since these are called from mid-layer EH thread, no other IO will be queued
3099  * to the resource being reset. However, control path (IOCTL) may be active so
3100  * it is necessary to synchronize IOARRIN writes which pmcraid_reset_device
3101  * takes care by locking/unlocking host_lock.
3102  *
3103  * Return value
3104  *      SUCCESS or FAILED
3105  */
3106 static int pmcraid_eh_device_reset_handler(struct scsi_cmnd *scmd)
3107 {
3108         scmd_printk(KERN_INFO, scmd,
3109                     "resetting device due to an I/O command timeout.\n");
3110         return pmcraid_reset_device(scmd,
3111                                     PMCRAID_INTERNAL_TIMEOUT,
3112                                     RESET_DEVICE_LUN);
3113 }
3114
3115 static int pmcraid_eh_bus_reset_handler(struct scsi_cmnd *scmd)
3116 {
3117         scmd_printk(KERN_INFO, scmd,
3118                     "Doing bus reset due to an I/O command timeout.\n");
3119         return pmcraid_reset_device(scmd,
3120                                     PMCRAID_RESET_BUS_TIMEOUT,
3121                                     RESET_DEVICE_BUS);
3122 }
3123
3124 static int pmcraid_eh_target_reset_handler(struct scsi_cmnd *scmd)
3125 {
3126         scmd_printk(KERN_INFO, scmd,
3127                     "Doing target reset due to an I/O command timeout.\n");
3128         return pmcraid_reset_device(scmd,
3129                                     PMCRAID_INTERNAL_TIMEOUT,
3130                                     RESET_DEVICE_TARGET);
3131 }
3132
3133 /**
3134  * pmcraid_eh_host_reset_handler - adapter reset handler callback
3135  *
3136  * @scmd: pointer to scsi_cmd that was sent to a resource of adapter
3137  *
3138  * Initiates adapter reset to bring it up to operational state
3139  *
3140  * Return value
3141  *      SUCCESS or FAILED
3142  */
3143 static int pmcraid_eh_host_reset_handler(struct scsi_cmnd *scmd)
3144 {
3145         unsigned long interval = 10000; /* 10 seconds interval */
3146         int waits = jiffies_to_msecs(PMCRAID_RESET_HOST_TIMEOUT) / interval;
3147         struct pmcraid_instance *pinstance =
3148                 (struct pmcraid_instance *)(scmd->device->host->hostdata);
3149
3150
3151         /* wait for an additional 150 seconds just in case firmware could come
3152          * up and if it could complete all the pending commands excluding the
3153          * two HCAM (CCN and LDN).
3154          */
3155         while (waits--) {
3156                 if (atomic_read(&pinstance->outstanding_cmds) <=
3157                     PMCRAID_MAX_HCAM_CMD)
3158                         return SUCCESS;
3159                 msleep(interval);
3160         }
3161
3162         dev_err(&pinstance->pdev->dev,
3163                 "Adapter being reset due to an I/O command timeout.\n");
3164         return pmcraid_reset_bringup(pinstance) == 0 ? SUCCESS : FAILED;
3165 }
3166
3167 /**
3168  * pmcraid_task_attributes - Translate SPI Q-Tags to task attributes
3169  * @scsi_cmd:   scsi command struct
3170  *
3171  * Return value
3172  *        number of tags or 0 if the task is not tagged
3173  */
3174 static u8 pmcraid_task_attributes(struct scsi_cmnd *scsi_cmd)
3175 {
3176         char tag[2];
3177         u8 rc = 0;
3178
3179         if (scsi_populate_tag_msg(scsi_cmd, tag)) {
3180                 switch (tag[0]) {
3181                 case MSG_SIMPLE_TAG:
3182                         rc = TASK_TAG_SIMPLE;
3183                         break;
3184                 case MSG_HEAD_TAG:
3185                         rc = TASK_TAG_QUEUE_HEAD;
3186                         break;
3187                 case MSG_ORDERED_TAG:
3188                         rc = TASK_TAG_ORDERED;
3189                         break;
3190                 };
3191         }
3192
3193         return rc;
3194 }
3195
3196
3197 /**
3198  * pmcraid_init_ioadls - initializes IOADL related fields in IOARCB
3199  * @cmd: pmcraid command struct
3200  * @sgcount: count of scatter-gather elements
3201  *
3202  * Return value
3203  *   returns pointer pmcraid_ioadl_desc, initialized to point to internal
3204  *   or external IOADLs
3205  */
3206 struct pmcraid_ioadl_desc *
3207 pmcraid_init_ioadls(struct pmcraid_cmd *cmd, int sgcount)
3208 {
3209         struct pmcraid_ioadl_desc *ioadl;
3210         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3211         int ioadl_count = 0;
3212
3213         if (ioarcb->add_cmd_param_length)
3214                 ioadl_count = DIV_ROUND_UP(ioarcb->add_cmd_param_length, 16);
3215         ioarcb->ioadl_length =
3216                 sizeof(struct pmcraid_ioadl_desc) * sgcount;
3217
3218         if ((sgcount + ioadl_count) > (ARRAY_SIZE(ioarcb->add_data.u.ioadl))) {
3219                 /* external ioadls start at offset 0x80 from control_block
3220                  * structure, re-using 24 out of 27 ioadls part of IOARCB.
3221                  * It is necessary to indicate to firmware that driver is
3222                  * using ioadls to be treated as external to IOARCB.
3223                  */
3224                 ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
3225                 ioarcb->ioadl_bus_addr =
3226                         cpu_to_le64((cmd->ioa_cb_bus_addr) +
3227                                 offsetof(struct pmcraid_ioarcb,
3228                                         add_data.u.ioadl[3]));
3229                 ioadl = &ioarcb->add_data.u.ioadl[3];
3230         } else {
3231                 ioarcb->ioadl_bus_addr =
3232                         cpu_to_le64((cmd->ioa_cb_bus_addr) +
3233                                 offsetof(struct pmcraid_ioarcb,
3234                                         add_data.u.ioadl[ioadl_count]));
3235
3236                 ioadl = &ioarcb->add_data.u.ioadl[ioadl_count];
3237                 ioarcb->ioarcb_bus_addr |=
3238                                 DIV_ROUND_CLOSEST(sgcount + ioadl_count, 8);
3239         }
3240
3241         return ioadl;
3242 }
3243
3244 /**
3245  * pmcraid_build_ioadl - Build a scatter/gather list and map the buffer
3246  * @pinstance: pointer to adapter instance structure
3247  * @cmd: pmcraid command struct
3248  *
3249  * This function is invoked by queuecommand entry point while sending a command
3250  * to firmware. This builds ioadl descriptors and sets up ioarcb fields.
3251  *
3252  * Return value:
3253  *      0 on success or -1 on failure
3254  */
3255 static int pmcraid_build_ioadl(
3256         struct pmcraid_instance *pinstance,
3257         struct pmcraid_cmd *cmd
3258 )
3259 {
3260         int i, nseg;
3261         struct scatterlist *sglist;
3262
3263         struct scsi_cmnd *scsi_cmd = cmd->scsi_cmd;
3264         struct pmcraid_ioarcb *ioarcb = &(cmd->ioa_cb->ioarcb);
3265         struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
3266
3267         u32 length = scsi_bufflen(scsi_cmd);
3268
3269         if (!length)
3270                 return 0;
3271
3272         nseg = scsi_dma_map(scsi_cmd);
3273
3274         if (nseg < 0) {
3275                 scmd_printk(KERN_ERR, scsi_cmd, "scsi_map_dma failed!\n");
3276                 return -1;
3277         } else if (nseg > PMCRAID_MAX_IOADLS) {
3278                 scsi_dma_unmap(scsi_cmd);
3279                 scmd_printk(KERN_ERR, scsi_cmd,
3280                         "sg count is (%d) more than allowed!\n", nseg);
3281                 return -1;
3282         }
3283
3284         /* Initialize IOARCB data transfer length fields */
3285         if (scsi_cmd->sc_data_direction == DMA_TO_DEVICE)
3286                 ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
3287
3288         ioarcb->request_flags0 |= NO_LINK_DESCS;
3289         ioarcb->data_transfer_length = cpu_to_le32(length);
3290         ioadl = pmcraid_init_ioadls(cmd, nseg);
3291
3292         /* Initialize IOADL descriptor addresses */
3293         scsi_for_each_sg(scsi_cmd, sglist, nseg, i) {
3294                 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sglist));
3295                 ioadl[i].address = cpu_to_le64(sg_dma_address(sglist));
3296                 ioadl[i].flags = 0;
3297         }
3298         /* setup last descriptor */
3299         ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3300
3301         return 0;
3302 }
3303
3304 /**
3305  * pmcraid_free_sglist - Frees an allocated SG buffer list
3306  * @sglist: scatter/gather list pointer
3307  *
3308  * Free a DMA'able memory previously allocated with pmcraid_alloc_sglist
3309  *
3310  * Return value:
3311  *      none
3312  */
3313 static void pmcraid_free_sglist(struct pmcraid_sglist *sglist)
3314 {
3315         int i;
3316
3317         for (i = 0; i < sglist->num_sg; i++)
3318                 __free_pages(sg_page(&(sglist->scatterlist[i])),
3319                              sglist->order);
3320
3321         kfree(sglist);
3322 }
3323
3324 /**
3325  * pmcraid_alloc_sglist - Allocates memory for a SG list
3326  * @buflen: buffer length
3327  *
3328  * Allocates a DMA'able buffer in chunks and assembles a scatter/gather
3329  * list.
3330  *
3331  * Return value
3332  *      pointer to sglist / NULL on failure
3333  */
3334 static struct pmcraid_sglist *pmcraid_alloc_sglist(int buflen)
3335 {
3336         struct pmcraid_sglist *sglist;
3337         struct scatterlist *scatterlist;
3338         struct page *page;
3339         int num_elem, i, j;
3340         int sg_size;
3341         int order;
3342         int bsize_elem;
3343
3344         sg_size = buflen / (PMCRAID_MAX_IOADLS - 1);
3345         order = (sg_size > 0) ? get_order(sg_size) : 0;
3346         bsize_elem = PAGE_SIZE * (1 << order);
3347
3348         /* Determine the actual number of sg entries needed */
3349         if (buflen % bsize_elem)
3350                 num_elem = (buflen / bsize_elem) + 1;
3351         else
3352                 num_elem = buflen / bsize_elem;
3353
3354         /* Allocate a scatter/gather list for the DMA */
3355         sglist = kzalloc(sizeof(struct pmcraid_sglist) +
3356                          (sizeof(struct scatterlist) * (num_elem - 1)),
3357                          GFP_KERNEL);
3358
3359         if (sglist == NULL)
3360                 return NULL;
3361
3362         scatterlist = sglist->scatterlist;
3363         sg_init_table(scatterlist, num_elem);
3364         sglist->order = order;
3365         sglist->num_sg = num_elem;
3366         sg_size = buflen;
3367
3368         for (i = 0; i < num_elem; i++) {
3369                 page = alloc_pages(GFP_KERNEL|GFP_DMA|__GFP_ZERO, order);
3370                 if (!page) {
3371                         for (j = i - 1; j >= 0; j--)
3372                                 __free_pages(sg_page(&scatterlist[j]), order);
3373                         kfree(sglist);
3374                         return NULL;
3375                 }
3376
3377                 sg_set_page(&scatterlist[i], page,
3378                         sg_size < bsize_elem ? sg_size : bsize_elem, 0);
3379                 sg_size -= bsize_elem;
3380         }
3381
3382         return sglist;
3383 }
3384
3385 /**
3386  * pmcraid_copy_sglist - Copy user buffer to kernel buffer's SG list
3387  * @sglist: scatter/gather list pointer
3388  * @buffer: buffer pointer
3389  * @len: buffer length
3390  * @direction: data transfer direction
3391  *
3392  * Copy a user buffer into a buffer allocated by pmcraid_alloc_sglist
3393  *
3394  * Return value:
3395  * 0 on success / other on failure
3396  */
3397 static int pmcraid_copy_sglist(
3398         struct pmcraid_sglist *sglist,
3399         unsigned long buffer,
3400         u32 len,
3401         int direction
3402 )
3403 {
3404         struct scatterlist *scatterlist;
3405         void *kaddr;
3406         int bsize_elem;
3407         int i;
3408         int rc = 0;
3409
3410         /* Determine the actual number of bytes per element */
3411         bsize_elem = PAGE_SIZE * (1 << sglist->order);
3412
3413         scatterlist = sglist->scatterlist;
3414
3415         for (i = 0; i < (len / bsize_elem); i++, buffer += bsize_elem) {
3416                 struct page *page = sg_page(&scatterlist[i]);
3417
3418                 kaddr = kmap(page);
3419                 if (direction == DMA_TO_DEVICE)
3420                         rc = __copy_from_user(kaddr,
3421                                               (void *)buffer,
3422                                               bsize_elem);
3423                 else
3424                         rc = __copy_to_user((void *)buffer, kaddr, bsize_elem);
3425
3426                 kunmap(page);
3427
3428                 if (rc) {
3429                         pmcraid_err("failed to copy user data into sg list\n");
3430                         return -EFAULT;
3431                 }
3432
3433                 scatterlist[i].length = bsize_elem;
3434         }
3435
3436         if (len % bsize_elem) {
3437                 struct page *page = sg_page(&scatterlist[i]);
3438
3439                 kaddr = kmap(page);
3440
3441                 if (direction == DMA_TO_DEVICE)
3442                         rc = __copy_from_user(kaddr,
3443                                               (void *)buffer,
3444                                               len % bsize_elem);
3445                 else
3446                         rc = __copy_to_user((void *)buffer,
3447                                             kaddr,
3448                                             len % bsize_elem);
3449
3450                 kunmap(page);
3451
3452                 scatterlist[i].length = len % bsize_elem;
3453         }
3454
3455         if (rc) {
3456                 pmcraid_err("failed to copy user data into sg list\n");
3457                 rc = -EFAULT;
3458         }
3459
3460         return rc;
3461 }
3462
3463 /**
3464  * pmcraid_queuecommand - Queue a mid-layer request
3465  * @scsi_cmd: scsi command struct
3466  * @done: done function
3467  *
3468  * This function queues a request generated by the mid-layer. Midlayer calls
3469  * this routine within host->lock. Some of the functions called by queuecommand
3470  * would use cmd block queue locks (free_pool_lock and pending_pool_lock)
3471  *
3472  * Return value:
3473  *        0 on success
3474  *        SCSI_MLQUEUE_DEVICE_BUSY if device is busy
3475  *        SCSI_MLQUEUE_HOST_BUSY if host is busy
3476  */
3477 static int pmcraid_queuecommand_lck(
3478         struct scsi_cmnd *scsi_cmd,
3479         void (*done) (struct scsi_cmnd *)
3480 )
3481 {
3482         struct pmcraid_instance *pinstance;
3483         struct pmcraid_resource_entry *res;
3484         struct pmcraid_ioarcb *ioarcb;
3485         struct pmcraid_cmd *cmd;
3486         u32 fw_version;
3487         int rc = 0;
3488
3489         pinstance =
3490                 (struct pmcraid_instance *)scsi_cmd->device->host->hostdata;
3491         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
3492         scsi_cmd->scsi_done = done;
3493         res = scsi_cmd->device->hostdata;
3494         scsi_cmd->result = (DID_OK << 16);
3495
3496         /* if adapter is marked as dead, set result to DID_NO_CONNECT complete
3497          * the command
3498          */
3499         if (pinstance->ioa_state == IOA_STATE_DEAD) {
3500                 pmcraid_info("IOA is dead, but queuecommand is scheduled\n");
3501                 scsi_cmd->result = (DID_NO_CONNECT << 16);
3502                 scsi_cmd->scsi_done(scsi_cmd);
3503                 return 0;
3504         }
3505
3506         /* If IOA reset is in progress, can't queue the commands */
3507         if (pinstance->ioa_reset_in_progress)
3508                 return SCSI_MLQUEUE_HOST_BUSY;
3509
3510         /* Firmware doesn't support SYNCHRONIZE_CACHE command (0x35), complete
3511          * the command here itself with success return
3512          */
3513         if (scsi_cmd->cmnd[0] == SYNCHRONIZE_CACHE) {
3514                 pmcraid_info("SYNC_CACHE(0x35), completing in driver itself\n");
3515                 scsi_cmd->scsi_done(scsi_cmd);
3516                 return 0;
3517         }
3518
3519         /* initialize the command and IOARCB to be sent to IOA */
3520         cmd = pmcraid_get_free_cmd(pinstance);
3521
3522         if (cmd == NULL) {
3523                 pmcraid_err("free command block is not available\n");
3524                 return SCSI_MLQUEUE_HOST_BUSY;
3525         }
3526
3527         cmd->scsi_cmd = scsi_cmd;
3528         ioarcb = &(cmd->ioa_cb->ioarcb);
3529         memcpy(ioarcb->cdb, scsi_cmd->cmnd, scsi_cmd->cmd_len);
3530         ioarcb->resource_handle = res->cfg_entry.resource_handle;
3531         ioarcb->request_type = REQ_TYPE_SCSI;
3532
3533         /* set hrrq number where the IOA should respond to. Note that all cmds
3534          * generated internally uses hrrq_id 0, exception to this is the cmd
3535          * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3536          * hrrq_id assigned here in queuecommand
3537          */
3538         ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3539                           pinstance->num_hrrq;
3540         cmd->cmd_done = pmcraid_io_done;
3541
3542         if (RES_IS_GSCSI(res->cfg_entry) || RES_IS_VSET(res->cfg_entry)) {
3543                 if (scsi_cmd->underflow == 0)
3544                         ioarcb->request_flags0 |= INHIBIT_UL_CHECK;
3545
3546                 if (res->sync_reqd) {
3547                         ioarcb->request_flags0 |= SYNC_COMPLETE;
3548                         res->sync_reqd = 0;
3549                 }
3550
3551                 ioarcb->request_flags0 |= NO_LINK_DESCS;
3552                 ioarcb->request_flags1 |= pmcraid_task_attributes(scsi_cmd);
3553
3554                 if (RES_IS_GSCSI(res->cfg_entry))
3555                         ioarcb->request_flags1 |= DELAY_AFTER_RESET;
3556         }
3557
3558         rc = pmcraid_build_ioadl(pinstance, cmd);
3559
3560         pmcraid_info("command (%d) CDB[0] = %x for %x:%x:%x:%x\n",
3561                      le32_to_cpu(ioarcb->response_handle) >> 2,
3562                      scsi_cmd->cmnd[0], pinstance->host->unique_id,
3563                      RES_IS_VSET(res->cfg_entry) ? PMCRAID_VSET_BUS_ID :
3564                         PMCRAID_PHYS_BUS_ID,
3565                      RES_IS_VSET(res->cfg_entry) ?
3566                         (fw_version <= PMCRAID_FW_VERSION_1 ?
3567                                 res->cfg_entry.unique_flags1 :
3568                                         res->cfg_entry.array_id & 0xFF) :
3569                         RES_TARGET(res->cfg_entry.resource_address),
3570                      RES_LUN(res->cfg_entry.resource_address));
3571
3572         if (likely(rc == 0)) {
3573                 _pmcraid_fire_command(cmd);
3574         } else {
3575                 pmcraid_err("queuecommand could not build ioadl\n");
3576                 pmcraid_return_cmd(cmd);
3577                 rc = SCSI_MLQUEUE_HOST_BUSY;
3578         }
3579
3580         return rc;
3581 }
3582
3583 static DEF_SCSI_QCMD(pmcraid_queuecommand)
3584
3585 /**
3586  * pmcraid_open -char node "open" entry, allowed only users with admin access
3587  */
3588 static int pmcraid_chr_open(struct inode *inode, struct file *filep)
3589 {
3590         struct pmcraid_instance *pinstance;
3591
3592         if (!capable(CAP_SYS_ADMIN))
3593                 return -EACCES;
3594
3595         /* Populate adapter instance * pointer for use by ioctl */
3596         pinstance = container_of(inode->i_cdev, struct pmcraid_instance, cdev);
3597         filep->private_data = pinstance;
3598
3599         return 0;
3600 }
3601
3602 /**
3603  * pmcraid_fasync - Async notifier registration from applications
3604  *
3605  * This function adds the calling process to a driver global queue. When an
3606  * event occurs, SIGIO will be sent to all processes in this queue.
3607  */
3608 static int pmcraid_chr_fasync(int fd, struct file *filep, int mode)
3609 {
3610         struct pmcraid_instance *pinstance;
3611         int rc;
3612
3613         pinstance = filep->private_data;
3614         mutex_lock(&pinstance->aen_queue_lock);
3615         rc = fasync_helper(fd, filep, mode, &pinstance->aen_queue);
3616         mutex_unlock(&pinstance->aen_queue_lock);
3617
3618         return rc;
3619 }
3620
3621
3622 /**
3623  * pmcraid_build_passthrough_ioadls - builds SG elements for passthrough
3624  * commands sent over IOCTL interface
3625  *
3626  * @cmd       : pointer to struct pmcraid_cmd
3627  * @buflen    : length of the request buffer
3628  * @direction : data transfer direction
3629  *
3630  * Return value
3631  *  0 on success, non-zero error code on failure
3632  */
3633 static int pmcraid_build_passthrough_ioadls(
3634         struct pmcraid_cmd *cmd,
3635         int buflen,
3636         int direction
3637 )
3638 {
3639         struct pmcraid_sglist *sglist = NULL;
3640         struct scatterlist *sg = NULL;
3641         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
3642         struct pmcraid_ioadl_desc *ioadl;
3643         int i;
3644
3645         sglist = pmcraid_alloc_sglist(buflen);
3646
3647         if (!sglist) {
3648                 pmcraid_err("can't allocate memory for passthrough SGls\n");
3649                 return -ENOMEM;
3650         }
3651
3652         sglist->num_dma_sg = pci_map_sg(cmd->drv_inst->pdev,
3653                                         sglist->scatterlist,
3654                                         sglist->num_sg, direction);
3655
3656         if (!sglist->num_dma_sg || sglist->num_dma_sg > PMCRAID_MAX_IOADLS) {
3657                 dev_err(&cmd->drv_inst->pdev->dev,
3658                         "Failed to map passthrough buffer!\n");
3659                 pmcraid_free_sglist(sglist);
3660                 return -EIO;
3661         }
3662
3663         cmd->sglist = sglist;
3664         ioarcb->request_flags0 |= NO_LINK_DESCS;
3665
3666         ioadl = pmcraid_init_ioadls(cmd, sglist->num_dma_sg);
3667
3668         /* Initialize IOADL descriptor addresses */
3669         for_each_sg(sglist->scatterlist, sg, sglist->num_dma_sg, i) {
3670                 ioadl[i].data_len = cpu_to_le32(sg_dma_len(sg));
3671                 ioadl[i].address = cpu_to_le64(sg_dma_address(sg));
3672                 ioadl[i].flags = 0;
3673         }
3674
3675         /* setup the last descriptor */
3676         ioadl[i - 1].flags = IOADL_FLAGS_LAST_DESC;
3677
3678         return 0;
3679 }
3680
3681
3682 /**
3683  * pmcraid_release_passthrough_ioadls - release passthrough ioadls
3684  *
3685  * @cmd: pointer to struct pmcraid_cmd for which ioadls were allocated
3686  * @buflen: size of the request buffer
3687  * @direction: data transfer direction
3688  *
3689  * Return value
3690  *  0 on success, non-zero error code on failure
3691  */
3692 static void pmcraid_release_passthrough_ioadls(
3693         struct pmcraid_cmd *cmd,
3694         int buflen,
3695         int direction
3696 )
3697 {
3698         struct pmcraid_sglist *sglist = cmd->sglist;
3699
3700         if (buflen > 0) {
3701                 pci_unmap_sg(cmd->drv_inst->pdev,
3702                              sglist->scatterlist,
3703                              sglist->num_sg,
3704                              direction);
3705                 pmcraid_free_sglist(sglist);
3706                 cmd->sglist = NULL;
3707         }
3708 }
3709
3710 /**
3711  * pmcraid_ioctl_passthrough - handling passthrough IOCTL commands
3712  *
3713  * @pinstance: pointer to adapter instance structure
3714  * @cmd: ioctl code
3715  * @arg: pointer to pmcraid_passthrough_buffer user buffer
3716  *
3717  * Return value
3718  *  0 on success, non-zero error code on failure
3719  */
3720 static long pmcraid_ioctl_passthrough(
3721         struct pmcraid_instance *pinstance,
3722         unsigned int ioctl_cmd,
3723         unsigned int buflen,
3724         unsigned long arg
3725 )
3726 {
3727         struct pmcraid_passthrough_ioctl_buffer *buffer;
3728         struct pmcraid_ioarcb *ioarcb;
3729         struct pmcraid_cmd *cmd;
3730         struct pmcraid_cmd *cancel_cmd;
3731         unsigned long request_buffer;
3732         unsigned long request_offset;
3733         unsigned long lock_flags;
3734         void *ioasa;
3735         u32 ioasc;
3736         int request_size;
3737         int buffer_size;
3738         u8 access, direction;
3739         int rc = 0;
3740
3741         /* If IOA reset is in progress, wait 10 secs for reset to complete */
3742         if (pinstance->ioa_reset_in_progress) {
3743                 rc = wait_event_interruptible_timeout(
3744                                 pinstance->reset_wait_q,
3745                                 !pinstance->ioa_reset_in_progress,
3746                                 msecs_to_jiffies(10000));
3747
3748                 if (!rc)
3749                         return -ETIMEDOUT;
3750                 else if (rc < 0)
3751                         return -ERESTARTSYS;
3752         }
3753
3754         /* If adapter is not in operational state, return error */
3755         if (pinstance->ioa_state != IOA_STATE_OPERATIONAL) {
3756                 pmcraid_err("IOA is not operational\n");
3757                 return -ENOTTY;
3758         }
3759
3760         buffer_size = sizeof(struct pmcraid_passthrough_ioctl_buffer);
3761         buffer = kmalloc(buffer_size, GFP_KERNEL);
3762
3763         if (!buffer) {
3764                 pmcraid_err("no memory for passthrough buffer\n");
3765                 return -ENOMEM;
3766         }
3767
3768         request_offset =
3769             offsetof(struct pmcraid_passthrough_ioctl_buffer, request_buffer);
3770
3771         request_buffer = arg + request_offset;
3772
3773         rc = __copy_from_user(buffer,
3774                              (struct pmcraid_passthrough_ioctl_buffer *) arg,
3775                              sizeof(struct pmcraid_passthrough_ioctl_buffer));
3776
3777         ioasa =
3778         (void *)(arg +
3779                 offsetof(struct pmcraid_passthrough_ioctl_buffer, ioasa));
3780
3781         if (rc) {
3782                 pmcraid_err("ioctl: can't copy passthrough buffer\n");
3783                 rc = -EFAULT;
3784                 goto out_free_buffer;
3785         }
3786
3787         request_size = buffer->ioarcb.data_transfer_length;
3788
3789         if (buffer->ioarcb.request_flags0 & TRANSFER_DIR_WRITE) {
3790                 access = VERIFY_READ;
3791                 direction = DMA_TO_DEVICE;
3792         } else {
3793                 access = VERIFY_WRITE;
3794                 direction = DMA_FROM_DEVICE;
3795         }
3796
3797         if (request_size > 0) {
3798                 rc = access_ok(access, arg, request_offset + request_size);
3799
3800                 if (!rc) {
3801                         rc = -EFAULT;
3802                         goto out_free_buffer;
3803                 }
3804         } else if (request_size < 0) {
3805                 rc = -EINVAL;
3806                 goto out_free_buffer;
3807         }
3808
3809         /* check if we have any additional command parameters */
3810         if (buffer->ioarcb.add_cmd_param_length > PMCRAID_ADD_CMD_PARAM_LEN) {
3811                 rc = -EINVAL;
3812                 goto out_free_buffer;
3813         }
3814
3815         cmd = pmcraid_get_free_cmd(pinstance);
3816
3817         if (!cmd) {
3818                 pmcraid_err("free command block is not available\n");
3819                 rc = -ENOMEM;
3820                 goto out_free_buffer;
3821         }
3822
3823         cmd->scsi_cmd = NULL;
3824         ioarcb = &(cmd->ioa_cb->ioarcb);
3825
3826         /* Copy the user-provided IOARCB stuff field by field */
3827         ioarcb->resource_handle = buffer->ioarcb.resource_handle;
3828         ioarcb->data_transfer_length = buffer->ioarcb.data_transfer_length;
3829         ioarcb->cmd_timeout = buffer->ioarcb.cmd_timeout;
3830         ioarcb->request_type = buffer->ioarcb.request_type;
3831         ioarcb->request_flags0 = buffer->ioarcb.request_flags0;
3832         ioarcb->request_flags1 = buffer->ioarcb.request_flags1;
3833         memcpy(ioarcb->cdb, buffer->ioarcb.cdb, PMCRAID_MAX_CDB_LEN);
3834
3835         if (buffer->ioarcb.add_cmd_param_length) {
3836                 ioarcb->add_cmd_param_length =
3837                         buffer->ioarcb.add_cmd_param_length;
3838                 ioarcb->add_cmd_param_offset =
3839                         buffer->ioarcb.add_cmd_param_offset;
3840                 memcpy(ioarcb->add_data.u.add_cmd_params,
3841                         buffer->ioarcb.add_data.u.add_cmd_params,
3842                         buffer->ioarcb.add_cmd_param_length);
3843         }
3844
3845         /* set hrrq number where the IOA should respond to. Note that all cmds
3846          * generated internally uses hrrq_id 0, exception to this is the cmd
3847          * block of scsi_cmd which is re-used (e.g. cancel/abort), which uses
3848          * hrrq_id assigned here in queuecommand
3849          */
3850         ioarcb->hrrq_id = atomic_add_return(1, &(pinstance->last_message_id)) %
3851                           pinstance->num_hrrq;
3852
3853         if (request_size) {
3854                 rc = pmcraid_build_passthrough_ioadls(cmd,
3855                                                       request_size,
3856                                                       direction);
3857                 if (rc) {
3858                         pmcraid_err("couldn't build passthrough ioadls\n");
3859                         goto out_free_buffer;
3860                 }
3861         } else if (request_size < 0) {
3862                 rc = -EINVAL;
3863                 goto out_free_buffer;
3864         }
3865
3866         /* If data is being written into the device, copy the data from user
3867          * buffers
3868          */
3869         if (direction == DMA_TO_DEVICE && request_size > 0) {
3870                 rc = pmcraid_copy_sglist(cmd->sglist,
3871                                          request_buffer,
3872                                          request_size,
3873                                          direction);
3874                 if (rc) {
3875                         pmcraid_err("failed to copy user buffer\n");
3876                         goto out_free_sglist;
3877                 }
3878         }
3879
3880         /* passthrough ioctl is a blocking command so, put the user to sleep
3881          * until timeout. Note that a timeout value of 0 means, do timeout.
3882          */
3883         cmd->cmd_done = pmcraid_internal_done;
3884         init_completion(&cmd->wait_for_completion);
3885         cmd->completion_req = 1;
3886
3887         pmcraid_info("command(%d) (CDB[0] = %x) for %x\n",
3888                      le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle) >> 2,
3889                      cmd->ioa_cb->ioarcb.cdb[0],
3890                      le32_to_cpu(cmd->ioa_cb->ioarcb.resource_handle));
3891
3892         spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3893         _pmcraid_fire_command(cmd);
3894         spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3895
3896         /* NOTE ! Remove the below line once abort_task is implemented
3897          * in firmware. This line disables ioctl command timeout handling logic
3898          * similar to IO command timeout handling, making ioctl commands to wait
3899          * until the command completion regardless of timeout value specified in
3900          * ioarcb
3901          */
3902         buffer->ioarcb.cmd_timeout = 0;
3903
3904         /* If command timeout is specified put caller to wait till that time,
3905          * otherwise it would be blocking wait. If command gets timed out, it
3906          * will be aborted.
3907          */
3908         if (buffer->ioarcb.cmd_timeout == 0) {
3909                 wait_for_completion(&cmd->wait_for_completion);
3910         } else if (!wait_for_completion_timeout(
3911                         &cmd->wait_for_completion,
3912                         msecs_to_jiffies(buffer->ioarcb.cmd_timeout * 1000))) {
3913
3914                 pmcraid_info("aborting cmd %d (CDB[0] = %x) due to timeout\n",
3915                         le32_to_cpu(cmd->ioa_cb->ioarcb.response_handle >> 2),
3916                         cmd->ioa_cb->ioarcb.cdb[0]);
3917
3918                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
3919                 cancel_cmd = pmcraid_abort_cmd(cmd);
3920                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
3921
3922                 if (cancel_cmd) {
3923                         wait_for_completion(&cancel_cmd->wait_for_completion);
3924                         ioasc = cancel_cmd->ioa_cb->ioasa.ioasc;
3925                         pmcraid_return_cmd(cancel_cmd);
3926
3927                         /* if abort task couldn't find the command i.e it got
3928                          * completed prior to aborting, return good completion.
3929                          * if command got aborted successfully or there was IOA
3930                          * reset due to abort task itself getting timedout then
3931                          * return -ETIMEDOUT
3932                          */
3933                         if (ioasc == PMCRAID_IOASC_IOA_WAS_RESET ||
3934                             PMCRAID_IOASC_SENSE_KEY(ioasc) == 0x00) {
3935                                 if (ioasc != PMCRAID_IOASC_GC_IOARCB_NOTFOUND)
3936                                         rc = -ETIMEDOUT;
3937                                 goto out_handle_response;
3938                         }
3939                 }
3940
3941                 /* no command block for abort task or abort task failed to abort
3942                  * the IOARCB, then wait for 150 more seconds and initiate reset
3943                  * sequence after timeout
3944                  */
3945                 if (!wait_for_completion_timeout(
3946                         &cmd->wait_for_completion,
3947                         msecs_to_jiffies(150 * 1000))) {
3948                         pmcraid_reset_bringup(cmd->drv_inst);
3949                         rc = -ETIMEDOUT;
3950                 }
3951         }
3952
3953 out_handle_response:
3954         /* copy entire IOASA buffer and return IOCTL success.
3955          * If copying IOASA to user-buffer fails, return
3956          * EFAULT
3957          */
3958         if (copy_to_user(ioasa, &cmd->ioa_cb->ioasa,
3959                 sizeof(struct pmcraid_ioasa))) {
3960                 pmcraid_err("failed to copy ioasa buffer to user\n");
3961                 rc = -EFAULT;
3962         }
3963
3964         /* If the data transfer was from device, copy the data onto user
3965          * buffers
3966          */
3967         else if (direction == DMA_FROM_DEVICE && request_size > 0) {
3968                 rc = pmcraid_copy_sglist(cmd->sglist,
3969                                          request_buffer,
3970                                          request_size,
3971                                          direction);
3972                 if (rc) {
3973                         pmcraid_err("failed to copy user buffer\n");
3974                         rc = -EFAULT;
3975                 }
3976         }
3977
3978 out_free_sglist:
3979         pmcraid_release_passthrough_ioadls(cmd, request_size, direction);
3980         pmcraid_return_cmd(cmd);
3981
3982 out_free_buffer:
3983         kfree(buffer);
3984
3985         return rc;
3986 }
3987
3988
3989
3990
3991 /**
3992  * pmcraid_ioctl_driver - ioctl handler for commands handled by driver itself
3993  *
3994  * @pinstance: pointer to adapter instance structure
3995  * @cmd: ioctl command passed in
3996  * @buflen: length of user_buffer
3997  * @user_buffer: user buffer pointer
3998  *
3999  * Return Value
4000  *   0 in case of success, otherwise appropriate error code
4001  */
4002 static long pmcraid_ioctl_driver(
4003         struct pmcraid_instance *pinstance,
4004         unsigned int cmd,
4005         unsigned int buflen,
4006         void __user *user_buffer
4007 )
4008 {
4009         int rc = -ENOSYS;
4010
4011         if (!access_ok(VERIFY_READ, user_buffer, _IOC_SIZE(cmd))) {
4012                 pmcraid_err("ioctl_driver: access fault in request buffer\n");
4013                 return -EFAULT;
4014         }
4015
4016         switch (cmd) {
4017         case PMCRAID_IOCTL_RESET_ADAPTER:
4018                 pmcraid_reset_bringup(pinstance);
4019                 rc = 0;
4020                 break;
4021
4022         default:
4023                 break;
4024         }
4025
4026         return rc;
4027 }
4028
4029 /**
4030  * pmcraid_check_ioctl_buffer - check for proper access to user buffer
4031  *
4032  * @cmd: ioctl command
4033  * @arg: user buffer
4034  * @hdr: pointer to kernel memory for pmcraid_ioctl_header
4035  *
4036  * Return Value
4037  *      negetive error code if there are access issues, otherwise zero.
4038  *      Upon success, returns ioctl header copied out of user buffer.
4039  */
4040
4041 static int pmcraid_check_ioctl_buffer(
4042         int cmd,
4043         void __user *arg,
4044         struct pmcraid_ioctl_header *hdr
4045 )
4046 {
4047         int rc = 0;
4048         int access = VERIFY_READ;
4049
4050         if (copy_from_user(hdr, arg, sizeof(struct pmcraid_ioctl_header))) {
4051                 pmcraid_err("couldn't copy ioctl header from user buffer\n");
4052                 return -EFAULT;
4053         }
4054
4055         /* check for valid driver signature */
4056         rc = memcmp(hdr->signature,
4057                     PMCRAID_IOCTL_SIGNATURE,
4058                     sizeof(hdr->signature));
4059         if (rc) {
4060                 pmcraid_err("signature verification failed\n");
4061                 return -EINVAL;
4062         }
4063
4064         /* check for appropriate buffer access */
4065         if ((_IOC_DIR(cmd) & _IOC_READ) == _IOC_READ)
4066                 access = VERIFY_WRITE;
4067
4068         rc = access_ok(access,
4069                        (arg + sizeof(struct pmcraid_ioctl_header)),
4070                        hdr->buffer_length);
4071         if (!rc) {
4072                 pmcraid_err("access failed for user buffer of size %d\n",
4073                              hdr->buffer_length);
4074                 return -EFAULT;
4075         }
4076
4077         return 0;
4078 }
4079
4080 /**
4081  *  pmcraid_ioctl - char node ioctl entry point
4082  */
4083 static long pmcraid_chr_ioctl(
4084         struct file *filep,
4085         unsigned int cmd,
4086         unsigned long arg
4087 )
4088 {
4089         struct pmcraid_instance *pinstance = NULL;
4090         struct pmcraid_ioctl_header *hdr = NULL;
4091         int retval = -ENOTTY;
4092
4093         hdr = kmalloc(sizeof(struct pmcraid_ioctl_header), GFP_KERNEL);
4094
4095         if (!hdr) {
4096                 pmcraid_err("failed to allocate memory for ioctl header\n");
4097                 return -ENOMEM;
4098         }
4099
4100         retval = pmcraid_check_ioctl_buffer(cmd, (void *)arg, hdr);
4101
4102         if (retval) {
4103                 pmcraid_info("chr_ioctl: header check failed\n");
4104                 kfree(hdr);
4105                 return retval;
4106         }
4107
4108         pinstance = filep->private_data;
4109
4110         if (!pinstance) {
4111                 pmcraid_info("adapter instance is not found\n");
4112                 kfree(hdr);
4113                 return -ENOTTY;
4114         }
4115
4116         switch (_IOC_TYPE(cmd)) {
4117
4118         case PMCRAID_PASSTHROUGH_IOCTL:
4119                 /* If ioctl code is to download microcode, we need to block
4120                  * mid-layer requests.
4121                  */
4122                 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4123                         scsi_block_requests(pinstance->host);
4124
4125                 retval = pmcraid_ioctl_passthrough(pinstance,
4126                                                    cmd,
4127                                                    hdr->buffer_length,
4128                                                    arg);
4129
4130                 if (cmd == PMCRAID_IOCTL_DOWNLOAD_MICROCODE)
4131                         scsi_unblock_requests(pinstance->host);
4132                 break;
4133
4134         case PMCRAID_DRIVER_IOCTL:
4135                 arg += sizeof(struct pmcraid_ioctl_header);
4136                 retval = pmcraid_ioctl_driver(pinstance,
4137                                               cmd,
4138                                               hdr->buffer_length,
4139                                               (void __user *)arg);
4140                 break;
4141
4142         default:
4143                 retval = -ENOTTY;
4144                 break;
4145         }
4146
4147         kfree(hdr);
4148
4149         return retval;
4150 }
4151
4152 /**
4153  * File operations structure for management interface
4154  */
4155 static const struct file_operations pmcraid_fops = {
4156         .owner = THIS_MODULE,
4157         .open = pmcraid_chr_open,
4158         .fasync = pmcraid_chr_fasync,
4159         .unlocked_ioctl = pmcraid_chr_ioctl,
4160 #ifdef CONFIG_COMPAT
4161         .compat_ioctl = pmcraid_chr_ioctl,
4162 #endif
4163         .llseek = noop_llseek,
4164 };
4165
4166
4167
4168
4169 /**
4170  * pmcraid_show_log_level - Display adapter's error logging level
4171  * @dev: class device struct
4172  * @buf: buffer
4173  *
4174  * Return value:
4175  *  number of bytes printed to buffer
4176  */
4177 static ssize_t pmcraid_show_log_level(
4178         struct device *dev,
4179         struct device_attribute *attr,
4180         char *buf)
4181 {
4182         struct Scsi_Host *shost = class_to_shost(dev);
4183         struct pmcraid_instance *pinstance =
4184                 (struct pmcraid_instance *)shost->hostdata;
4185         return snprintf(buf, PAGE_SIZE, "%d\n", pinstance->current_log_level);
4186 }
4187
4188 /**
4189  * pmcraid_store_log_level - Change the adapter's error logging level
4190  * @dev: class device struct
4191  * @buf: buffer
4192  * @count: not used
4193  *
4194  * Return value:
4195  *  number of bytes printed to buffer
4196  */
4197 static ssize_t pmcraid_store_log_level(
4198         struct device *dev,
4199         struct device_attribute *attr,
4200         const char *buf,
4201         size_t count
4202 )
4203 {
4204         struct Scsi_Host *shost;
4205         struct pmcraid_instance *pinstance;
4206         unsigned long val;
4207
4208         if (strict_strtoul(buf, 10, &val))
4209                 return -EINVAL;
4210         /* log-level should be from 0 to 2 */
4211         if (val > 2)
4212                 return -EINVAL;
4213
4214         shost = class_to_shost(dev);
4215         pinstance = (struct pmcraid_instance *)shost->hostdata;
4216         pinstance->current_log_level = val;
4217
4218         return strlen(buf);
4219 }
4220
4221 static struct device_attribute pmcraid_log_level_attr = {
4222         .attr = {
4223                  .name = "log_level",
4224                  .mode = S_IRUGO | S_IWUSR,
4225                  },
4226         .show = pmcraid_show_log_level,
4227         .store = pmcraid_store_log_level,
4228 };
4229
4230 /**
4231  * pmcraid_show_drv_version - Display driver version
4232  * @dev: class device struct
4233  * @buf: buffer
4234  *
4235  * Return value:
4236  *  number of bytes printed to buffer
4237  */
4238 static ssize_t pmcraid_show_drv_version(
4239         struct device *dev,
4240         struct device_attribute *attr,
4241         char *buf
4242 )
4243 {
4244         return snprintf(buf, PAGE_SIZE, "version: %s\n",
4245                         PMCRAID_DRIVER_VERSION);
4246 }
4247
4248 static struct device_attribute pmcraid_driver_version_attr = {
4249         .attr = {
4250                  .name = "drv_version",
4251                  .mode = S_IRUGO,
4252                  },
4253         .show = pmcraid_show_drv_version,
4254 };
4255
4256 /**
4257  * pmcraid_show_io_adapter_id - Display driver assigned adapter id
4258  * @dev: class device struct
4259  * @buf: buffer
4260  *
4261  * Return value:
4262  *  number of bytes printed to buffer
4263  */
4264 static ssize_t pmcraid_show_adapter_id(
4265         struct device *dev,
4266         struct device_attribute *attr,
4267         char *buf
4268 )
4269 {
4270         struct Scsi_Host *shost = class_to_shost(dev);
4271         struct pmcraid_instance *pinstance =
4272                 (struct pmcraid_instance *)shost->hostdata;
4273         u32 adapter_id = (pinstance->pdev->bus->number << 8) |
4274                 pinstance->pdev->devfn;
4275         u32 aen_group = pmcraid_event_family.id;
4276
4277         return snprintf(buf, PAGE_SIZE,
4278                         "adapter id: %d\nminor: %d\naen group: %d\n",
4279                         adapter_id, MINOR(pinstance->cdev.dev), aen_group);
4280 }
4281
4282 static struct device_attribute pmcraid_adapter_id_attr = {
4283         .attr = {
4284                  .name = "adapter_id",
4285                  .mode = S_IRUGO | S_IWUSR,
4286                  },
4287         .show = pmcraid_show_adapter_id,
4288 };
4289
4290 static struct device_attribute *pmcraid_host_attrs[] = {
4291         &pmcraid_log_level_attr,
4292         &pmcraid_driver_version_attr,
4293         &pmcraid_adapter_id_attr,
4294         NULL,
4295 };
4296
4297
4298 /* host template structure for pmcraid driver */
4299 static struct scsi_host_template pmcraid_host_template = {
4300         .module = THIS_MODULE,
4301         .name = PMCRAID_DRIVER_NAME,
4302         .queuecommand = pmcraid_queuecommand,
4303         .eh_abort_handler = pmcraid_eh_abort_handler,
4304         .eh_bus_reset_handler = pmcraid_eh_bus_reset_handler,
4305         .eh_target_reset_handler = pmcraid_eh_target_reset_handler,
4306         .eh_device_reset_handler = pmcraid_eh_device_reset_handler,
4307         .eh_host_reset_handler = pmcraid_eh_host_reset_handler,
4308
4309         .slave_alloc = pmcraid_slave_alloc,
4310         .slave_configure = pmcraid_slave_configure,
4311         .slave_destroy = pmcraid_slave_destroy,
4312         .change_queue_depth = pmcraid_change_queue_depth,
4313         .change_queue_type  = pmcraid_change_queue_type,
4314         .can_queue = PMCRAID_MAX_IO_CMD,
4315         .this_id = -1,
4316         .sg_tablesize = PMCRAID_MAX_IOADLS,
4317         .max_sectors = PMCRAID_IOA_MAX_SECTORS,
4318         .cmd_per_lun = PMCRAID_MAX_CMD_PER_LUN,
4319         .use_clustering = ENABLE_CLUSTERING,
4320         .shost_attrs = pmcraid_host_attrs,
4321         .proc_name = PMCRAID_DRIVER_NAME
4322 };
4323
4324 /*
4325  * pmcraid_isr_msix - implements MSI-X interrupt handling routine
4326  * @irq: interrupt vector number
4327  * @dev_id: pointer hrrq_vector
4328  *
4329  * Return Value
4330  *       IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4331  */
4332
4333 static irqreturn_t pmcraid_isr_msix(int irq, void *dev_id)
4334 {
4335         struct pmcraid_isr_param *hrrq_vector;
4336         struct pmcraid_instance *pinstance;
4337         unsigned long lock_flags;
4338         u32 intrs_val;
4339         int hrrq_id;
4340
4341         hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4342         hrrq_id = hrrq_vector->hrrq_id;
4343         pinstance = hrrq_vector->drv_inst;
4344
4345         if (!hrrq_id) {
4346                 /* Read the interrupt */
4347                 intrs_val = pmcraid_read_interrupts(pinstance);
4348                 if (intrs_val &&
4349                         ((ioread32(pinstance->int_regs.host_ioa_interrupt_reg)
4350                         & DOORBELL_INTR_MSIX_CLR) == 0)) {
4351                         /* Any error interrupts including unit_check,
4352                          * initiate IOA reset.In case of unit check indicate
4353                          * to reset_sequence that IOA unit checked and prepare
4354                          * for a dump during reset sequence
4355                          */
4356                         if (intrs_val & PMCRAID_ERROR_INTERRUPTS) {
4357                                 if (intrs_val & INTRS_IOA_UNIT_CHECK)
4358                                         pinstance->ioa_unit_check = 1;
4359
4360                                 pmcraid_err("ISR: error interrupts: %x \
4361                                         initiating reset\n", intrs_val);
4362                                 spin_lock_irqsave(pinstance->host->host_lock,
4363                                         lock_flags);
4364                                 pmcraid_initiate_reset(pinstance);
4365                                 spin_unlock_irqrestore(
4366                                         pinstance->host->host_lock,
4367                                         lock_flags);
4368                         }
4369                         /* If interrupt was as part of the ioa initialization,
4370                          * clear it. Delete the timer and wakeup the
4371                          * reset engine to proceed with reset sequence
4372                          */
4373                         if (intrs_val & INTRS_TRANSITION_TO_OPERATIONAL)
4374                                 pmcraid_clr_trans_op(pinstance);
4375
4376                         /* Clear the interrupt register by writing
4377                          * to host to ioa doorbell. Once done
4378                          * FW will clear the interrupt.
4379                          */
4380                         iowrite32(DOORBELL_INTR_MSIX_CLR,
4381                                 pinstance->int_regs.host_ioa_interrupt_reg);
4382                         ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4383
4384
4385                 }
4386         }
4387
4388         tasklet_schedule(&(pinstance->isr_tasklet[hrrq_id]));
4389
4390         return IRQ_HANDLED;
4391 }
4392
4393 /**
4394  * pmcraid_isr  - implements legacy interrupt handling routine
4395  *
4396  * @irq: interrupt vector number
4397  * @dev_id: pointer hrrq_vector
4398  *
4399  * Return Value
4400  *       IRQ_HANDLED if interrupt is handled or IRQ_NONE if ignored
4401  */
4402 static irqreturn_t pmcraid_isr(int irq, void *dev_id)
4403 {
4404         struct pmcraid_isr_param *hrrq_vector;
4405         struct pmcraid_instance *pinstance;
4406         u32 intrs;
4407         unsigned long lock_flags;
4408         int hrrq_id = 0;
4409
4410         /* In case of legacy interrupt mode where interrupts are shared across
4411          * isrs, it may be possible that the current interrupt is not from IOA
4412          */
4413         if (!dev_id) {
4414                 printk(KERN_INFO "%s(): NULL host pointer\n", __func__);
4415                 return IRQ_NONE;
4416         }
4417         hrrq_vector = (struct pmcraid_isr_param *)dev_id;
4418         pinstance = hrrq_vector->drv_inst;
4419
4420         intrs = pmcraid_read_interrupts(pinstance);
4421
4422         if (unlikely((intrs & PMCRAID_PCI_INTERRUPTS) == 0))
4423                 return IRQ_NONE;
4424
4425         /* Any error interrupts including unit_check, initiate IOA reset.
4426          * In case of unit check indicate to reset_sequence that IOA unit
4427          * checked and prepare for a dump during reset sequence
4428          */
4429         if (intrs & PMCRAID_ERROR_INTERRUPTS) {
4430
4431                 if (intrs & INTRS_IOA_UNIT_CHECK)
4432                         pinstance->ioa_unit_check = 1;
4433
4434                 iowrite32(intrs,
4435                           pinstance->int_regs.ioa_host_interrupt_clr_reg);
4436                 pmcraid_err("ISR: error interrupts: %x initiating reset\n",
4437                             intrs);
4438                 intrs = ioread32(
4439                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4440                 spin_lock_irqsave(pinstance->host->host_lock, lock_flags);
4441                 pmcraid_initiate_reset(pinstance);
4442                 spin_unlock_irqrestore(pinstance->host->host_lock, lock_flags);
4443         } else {
4444                 /* If interrupt was as part of the ioa initialization,
4445                  * clear. Delete the timer and wakeup the
4446                  * reset engine to proceed with reset sequence
4447                  */
4448                 if (intrs & INTRS_TRANSITION_TO_OPERATIONAL) {
4449                         pmcraid_clr_trans_op(pinstance);
4450                 } else {
4451                         iowrite32(intrs,
4452                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4453                         ioread32(
4454                                 pinstance->int_regs.ioa_host_interrupt_clr_reg);
4455
4456                         tasklet_schedule(
4457                                         &(pinstance->isr_tasklet[hrrq_id]));
4458                 }
4459         }
4460
4461         return IRQ_HANDLED;
4462 }
4463
4464
4465 /**
4466  * pmcraid_worker_function -  worker thread function
4467  *
4468  * @workp: pointer to struct work queue
4469  *
4470  * Return Value
4471  *       None
4472  */
4473
4474 static void pmcraid_worker_function(struct work_struct *workp)
4475 {
4476         struct pmcraid_instance *pinstance;
4477         struct pmcraid_resource_entry *res;
4478         struct pmcraid_resource_entry *temp;
4479         struct scsi_device *sdev;
4480         unsigned long lock_flags;
4481         unsigned long host_lock_flags;
4482         u16 fw_version;
4483         u8 bus, target, lun;
4484
4485         pinstance = container_of(workp, struct pmcraid_instance, worker_q);
4486         /* add resources only after host is added into system */
4487         if (!atomic_read(&pinstance->expose_resources))
4488                 return;
4489
4490         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
4491
4492         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
4493         list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue) {
4494
4495                 if (res->change_detected == RES_CHANGE_DEL && res->scsi_dev) {
4496                         sdev = res->scsi_dev;
4497
4498                         /* host_lock must be held before calling
4499                          * scsi_device_get
4500                          */
4501                         spin_lock_irqsave(pinstance->host->host_lock,
4502                                           host_lock_flags);
4503                         if (!scsi_device_get(sdev)) {
4504                                 spin_unlock_irqrestore(
4505                                                 pinstance->host->host_lock,
4506                                                 host_lock_flags);
4507                                 pmcraid_info("deleting %x from midlayer\n",
4508                                              res->cfg_entry.resource_address);
4509                                 list_move_tail(&res->queue,
4510                                                 &pinstance->free_res_q);
4511                                 spin_unlock_irqrestore(
4512                                         &pinstance->resource_lock,
4513                                         lock_flags);
4514                                 scsi_remove_device(sdev);
4515                                 scsi_device_put(sdev);
4516                                 spin_lock_irqsave(&pinstance->resource_lock,
4517                                                    lock_flags);
4518                                 res->change_detected = 0;
4519                         } else {
4520                                 spin_unlock_irqrestore(
4521                                                 pinstance->host->host_lock,
4522                                                 host_lock_flags);
4523                         }
4524                 }
4525         }
4526
4527         list_for_each_entry(res, &pinstance->used_res_q, queue) {
4528
4529                 if (res->change_detected == RES_CHANGE_ADD) {
4530
4531                         if (!pmcraid_expose_resource(fw_version,
4532                                                      &res->cfg_entry))
4533                                 continue;
4534
4535                         if (RES_IS_VSET(res->cfg_entry)) {
4536                                 bus = PMCRAID_VSET_BUS_ID;
4537                                 if (fw_version <= PMCRAID_FW_VERSION_1)
4538                                         target = res->cfg_entry.unique_flags1;
4539                                 else
4540                                         target = res->cfg_entry.array_id & 0xFF;
4541                                 lun = PMCRAID_VSET_LUN_ID;
4542                         } else {
4543                                 bus = PMCRAID_PHYS_BUS_ID;
4544                                 target =
4545                                      RES_TARGET(
4546                                         res->cfg_entry.resource_address);
4547                                 lun = RES_LUN(res->cfg_entry.resource_address);
4548                         }
4549
4550                         res->change_detected = 0;
4551                         spin_unlock_irqrestore(&pinstance->resource_lock,
4552                                                 lock_flags);
4553                         scsi_add_device(pinstance->host, bus, target, lun);
4554                         spin_lock_irqsave(&pinstance->resource_lock,
4555                                            lock_flags);
4556                 }
4557         }
4558
4559         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
4560 }
4561
4562 /**
4563  * pmcraid_tasklet_function - Tasklet function
4564  *
4565  * @instance: pointer to msix param structure
4566  *
4567  * Return Value
4568  *      None
4569  */
4570 static void pmcraid_tasklet_function(unsigned long instance)
4571 {
4572         struct pmcraid_isr_param *hrrq_vector;
4573         struct pmcraid_instance *pinstance;
4574         unsigned long hrrq_lock_flags;
4575         unsigned long pending_lock_flags;
4576         unsigned long host_lock_flags;
4577         spinlock_t *lockp; /* hrrq buffer lock */
4578         int id;
4579         __le32 resp;
4580
4581         hrrq_vector = (struct pmcraid_isr_param *)instance;
4582         pinstance = hrrq_vector->drv_inst;
4583         id = hrrq_vector->hrrq_id;
4584         lockp = &(pinstance->hrrq_lock[id]);
4585
4586         /* loop through each of the commands responded by IOA. Each HRRQ buf is
4587          * protected by its own lock. Traversals must be done within this lock
4588          * as there may be multiple tasklets running on multiple CPUs. Note
4589          * that the lock is held just for picking up the response handle and
4590          * manipulating hrrq_curr/toggle_bit values.
4591          */
4592         spin_lock_irqsave(lockp, hrrq_lock_flags);
4593
4594         resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4595
4596         while ((resp & HRRQ_TOGGLE_BIT) ==
4597                 pinstance->host_toggle_bit[id]) {
4598
4599                 int cmd_index = resp >> 2;
4600                 struct pmcraid_cmd *cmd = NULL;
4601
4602                 if (pinstance->hrrq_curr[id] < pinstance->hrrq_end[id]) {
4603                         pinstance->hrrq_curr[id]++;
4604                 } else {
4605                         pinstance->hrrq_curr[id] = pinstance->hrrq_start[id];
4606                         pinstance->host_toggle_bit[id] ^= 1u;
4607                 }
4608
4609                 if (cmd_index >= PMCRAID_MAX_CMD) {
4610                         /* In case of invalid response handle, log message */
4611                         pmcraid_err("Invalid response handle %d\n", cmd_index);
4612                         resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4613                         continue;
4614                 }
4615
4616                 cmd = pinstance->cmd_list[cmd_index];
4617                 spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4618
4619                 spin_lock_irqsave(&pinstance->pending_pool_lock,
4620                                    pending_lock_flags);
4621                 list_del(&cmd->free_list);
4622                 spin_unlock_irqrestore(&pinstance->pending_pool_lock,
4623                                         pending_lock_flags);
4624                 del_timer(&cmd->timer);
4625                 atomic_dec(&pinstance->outstanding_cmds);
4626
4627                 if (cmd->cmd_done == pmcraid_ioa_reset) {
4628                         spin_lock_irqsave(pinstance->host->host_lock,
4629                                           host_lock_flags);
4630                         cmd->cmd_done(cmd);
4631                         spin_unlock_irqrestore(pinstance->host->host_lock,
4632                                                host_lock_flags);
4633                 } else if (cmd->cmd_done != NULL) {
4634                         cmd->cmd_done(cmd);
4635                 }
4636                 /* loop over until we are done with all responses */
4637                 spin_lock_irqsave(lockp, hrrq_lock_flags);
4638                 resp = le32_to_cpu(*(pinstance->hrrq_curr[id]));
4639         }
4640
4641         spin_unlock_irqrestore(lockp, hrrq_lock_flags);
4642 }
4643
4644 /**
4645  * pmcraid_unregister_interrupt_handler - de-register interrupts handlers
4646  * @pinstance: pointer to adapter instance structure
4647  *
4648  * This routine un-registers registered interrupt handler and
4649  * also frees irqs/vectors.
4650  *
4651  * Retun Value
4652  *      None
4653  */
4654 static
4655 void pmcraid_unregister_interrupt_handler(struct pmcraid_instance *pinstance)
4656 {
4657         int i;
4658
4659         for (i = 0; i < pinstance->num_hrrq; i++)
4660                 free_irq(pinstance->hrrq_vector[i].vector,
4661                          &(pinstance->hrrq_vector[i]));
4662
4663         if (pinstance->interrupt_mode) {
4664                 pci_disable_msix(pinstance->pdev);
4665                 pinstance->interrupt_mode = 0;
4666         }
4667 }
4668
4669 /**
4670  * pmcraid_register_interrupt_handler - registers interrupt handler
4671  * @pinstance: pointer to per-adapter instance structure
4672  *
4673  * Return Value
4674  *      0 on success, non-zero error code otherwise.
4675  */
4676 static int
4677 pmcraid_register_interrupt_handler(struct pmcraid_instance *pinstance)
4678 {
4679         int rc;
4680         struct pci_dev *pdev = pinstance->pdev;
4681
4682         if ((pmcraid_enable_msix) &&
4683                 (pci_find_capability(pdev, PCI_CAP_ID_MSIX))) {
4684                 int num_hrrq = PMCRAID_NUM_MSIX_VECTORS;
4685                 struct msix_entry entries[PMCRAID_NUM_MSIX_VECTORS];
4686                 int i;
4687                 for (i = 0; i < PMCRAID_NUM_MSIX_VECTORS; i++)
4688                         entries[i].entry = i;
4689
4690                 rc = pci_enable_msix(pdev, entries, num_hrrq);
4691                 if (rc < 0)
4692                         goto pmcraid_isr_legacy;
4693
4694                 /* Check how many MSIX vectors are allocated and register
4695                  * msi-x handlers for each of them giving appropriate buffer
4696                  */
4697                 if (rc > 0) {
4698                         num_hrrq = rc;
4699                         if (pci_enable_msix(pdev, entries, num_hrrq))
4700                                 goto pmcraid_isr_legacy;
4701                 }
4702
4703                 for (i = 0; i < num_hrrq; i++) {
4704                         pinstance->hrrq_vector[i].hrrq_id = i;
4705                         pinstance->hrrq_vector[i].drv_inst = pinstance;
4706                         pinstance->hrrq_vector[i].vector = entries[i].vector;
4707                         rc = request_irq(pinstance->hrrq_vector[i].vector,
4708                                         pmcraid_isr_msix, 0,
4709                                         PMCRAID_DRIVER_NAME,
4710                                         &(pinstance->hrrq_vector[i]));
4711
4712                         if (rc) {
4713                                 int j;
4714                                 for (j = 0; j < i; j++)
4715                                         free_irq(entries[j].vector,
4716                                                  &(pinstance->hrrq_vector[j]));
4717                                 pci_disable_msix(pdev);
4718                                 goto pmcraid_isr_legacy;
4719                         }
4720                 }
4721
4722                 pinstance->num_hrrq = num_hrrq;
4723                 pinstance->interrupt_mode = 1;
4724                 iowrite32(DOORBELL_INTR_MODE_MSIX,
4725                           pinstance->int_regs.host_ioa_interrupt_reg);
4726                 ioread32(pinstance->int_regs.host_ioa_interrupt_reg);
4727                 goto pmcraid_isr_out;
4728         }
4729
4730 pmcraid_isr_legacy:
4731         /* If MSI-X registration failed fallback to legacy mode, where
4732          * only one hrrq entry will be used
4733          */
4734         pinstance->hrrq_vector[0].hrrq_id = 0;
4735         pinstance->hrrq_vector[0].drv_inst = pinstance;
4736         pinstance->hrrq_vector[0].vector = pdev->irq;
4737         pinstance->num_hrrq = 1;
4738         rc = 0;
4739
4740         rc = request_irq(pdev->irq, pmcraid_isr, IRQF_SHARED,
4741                          PMCRAID_DRIVER_NAME, &pinstance->hrrq_vector[0]);
4742 pmcraid_isr_out:
4743         return rc;
4744 }
4745
4746 /**
4747  * pmcraid_release_cmd_blocks - release buufers allocated for command blocks
4748  * @pinstance: per adapter instance structure pointer
4749  * @max_index: number of buffer blocks to release
4750  *
4751  * Return Value
4752  *  None
4753  */
4754 static void
4755 pmcraid_release_cmd_blocks(struct pmcraid_instance *pinstance, int max_index)
4756 {
4757         int i;
4758         for (i = 0; i < max_index; i++) {
4759                 kmem_cache_free(pinstance->cmd_cachep, pinstance->cmd_list[i]);
4760                 pinstance->cmd_list[i] = NULL;
4761         }
4762         kmem_cache_destroy(pinstance->cmd_cachep);
4763         pinstance->cmd_cachep = NULL;
4764 }
4765
4766 /**
4767  * pmcraid_release_control_blocks - releases buffers alloced for control blocks
4768  * @pinstance: pointer to per adapter instance structure
4769  * @max_index: number of buffers (from 0 onwards) to release
4770  *
4771  * This function assumes that the command blocks for which control blocks are
4772  * linked are not released.
4773  *
4774  * Return Value
4775  *       None
4776  */
4777 static void
4778 pmcraid_release_control_blocks(
4779         struct pmcraid_instance *pinstance,
4780         int max_index
4781 )
4782 {
4783         int i;
4784
4785         if (pinstance->control_pool == NULL)
4786                 return;
4787
4788         for (i = 0; i < max_index; i++) {
4789                 pci_pool_free(pinstance->control_pool,
4790                               pinstance->cmd_list[i]->ioa_cb,
4791                               pinstance->cmd_list[i]->ioa_cb_bus_addr);
4792                 pinstance->cmd_list[i]->ioa_cb = NULL;
4793                 pinstance->cmd_list[i]->ioa_cb_bus_addr = 0;
4794         }
4795         pci_pool_destroy(pinstance->control_pool);
4796         pinstance->control_pool = NULL;
4797 }
4798
4799 /**
4800  * pmcraid_allocate_cmd_blocks - allocate memory for cmd block structures
4801  * @pinstance - pointer to per adapter instance structure
4802  *
4803  * Allocates memory for command blocks using kernel slab allocator.
4804  *
4805  * Return Value
4806  *      0 in case of success; -ENOMEM in case of failure
4807  */
4808 static int pmcraid_allocate_cmd_blocks(struct pmcraid_instance *pinstance)
4809 {
4810         int i;
4811
4812         sprintf(pinstance->cmd_pool_name, "pmcraid_cmd_pool_%d",
4813                 pinstance->host->unique_id);
4814
4815
4816         pinstance->cmd_cachep = kmem_cache_create(
4817                                         pinstance->cmd_pool_name,
4818                                         sizeof(struct pmcraid_cmd), 0,
4819                                         SLAB_HWCACHE_ALIGN, NULL);
4820         if (!pinstance->cmd_cachep)
4821                 return -ENOMEM;
4822
4823         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4824                 pinstance->cmd_list[i] =
4825                         kmem_cache_alloc(pinstance->cmd_cachep, GFP_KERNEL);
4826                 if (!pinstance->cmd_list[i]) {
4827                         pmcraid_release_cmd_blocks(pinstance, i);
4828                         return -ENOMEM;
4829                 }
4830         }
4831         return 0;
4832 }
4833
4834 /**
4835  * pmcraid_allocate_control_blocks - allocates memory control blocks
4836  * @pinstance : pointer to per adapter instance structure
4837  *
4838  * This function allocates PCI memory for DMAable buffers like IOARCB, IOADLs
4839  * and IOASAs. This is called after command blocks are already allocated.
4840  *
4841  * Return Value
4842  *  0 in case it can allocate all control blocks, otherwise -ENOMEM
4843  */
4844 static int pmcraid_allocate_control_blocks(struct pmcraid_instance *pinstance)
4845 {
4846         int i;
4847
4848         sprintf(pinstance->ctl_pool_name, "pmcraid_control_pool_%d",
4849                 pinstance->host->unique_id);
4850
4851         pinstance->control_pool =
4852                 pci_pool_create(pinstance->ctl_pool_name,
4853                                 pinstance->pdev,
4854                                 sizeof(struct pmcraid_control_block),
4855                                 PMCRAID_IOARCB_ALIGNMENT, 0);
4856
4857         if (!pinstance->control_pool)
4858                 return -ENOMEM;
4859
4860         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
4861                 pinstance->cmd_list[i]->ioa_cb =
4862                         pci_pool_alloc(
4863                                 pinstance->control_pool,
4864                                 GFP_KERNEL,
4865                                 &(pinstance->cmd_list[i]->ioa_cb_bus_addr));
4866
4867                 if (!pinstance->cmd_list[i]->ioa_cb) {
4868                         pmcraid_release_control_blocks(pinstance, i);
4869                         return -ENOMEM;
4870                 }
4871                 memset(pinstance->cmd_list[i]->ioa_cb, 0,
4872                         sizeof(struct pmcraid_control_block));
4873         }
4874         return 0;
4875 }
4876
4877 /**
4878  * pmcraid_release_host_rrqs - release memory allocated for hrrq buffer(s)
4879  * @pinstance: pointer to per adapter instance structure
4880  * @maxindex: size of hrrq buffer pointer array
4881  *
4882  * Return Value
4883  *      None
4884  */
4885 static void
4886 pmcraid_release_host_rrqs(struct pmcraid_instance *pinstance, int maxindex)
4887 {
4888         int i;
4889         for (i = 0; i < maxindex; i++) {
4890
4891                 pci_free_consistent(pinstance->pdev,
4892                                     HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD,
4893                                     pinstance->hrrq_start[i],
4894                                     pinstance->hrrq_start_bus_addr[i]);
4895
4896                 /* reset pointers and toggle bit to zeros */
4897                 pinstance->hrrq_start[i] = NULL;
4898                 pinstance->hrrq_start_bus_addr[i] = 0;
4899                 pinstance->host_toggle_bit[i] = 0;
4900         }
4901 }
4902
4903 /**
4904  * pmcraid_allocate_host_rrqs - Allocate and initialize host RRQ buffers
4905  * @pinstance: pointer to per adapter instance structure
4906  *
4907  * Return value
4908  *      0 hrrq buffers are allocated, -ENOMEM otherwise.
4909  */
4910 static int pmcraid_allocate_host_rrqs(struct pmcraid_instance *pinstance)
4911 {
4912         int i, buffer_size;
4913
4914         buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
4915
4916         for (i = 0; i < pinstance->num_hrrq; i++) {
4917                 pinstance->hrrq_start[i] =
4918                         pci_alloc_consistent(
4919                                         pinstance->pdev,
4920                                         buffer_size,
4921                                         &(pinstance->hrrq_start_bus_addr[i]));
4922
4923                 if (pinstance->hrrq_start[i] == 0) {
4924                         pmcraid_err("pci_alloc failed for hrrq vector : %d\n",
4925                                     i);
4926                         pmcraid_release_host_rrqs(pinstance, i);
4927                         return -ENOMEM;
4928                 }
4929
4930                 memset(pinstance->hrrq_start[i], 0, buffer_size);
4931                 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
4932                 pinstance->hrrq_end[i] =
4933                         pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
4934                 pinstance->host_toggle_bit[i] = 1;
4935                 spin_lock_init(&pinstance->hrrq_lock[i]);
4936         }
4937         return 0;
4938 }
4939
4940 /**
4941  * pmcraid_release_hcams - release HCAM buffers
4942  *
4943  * @pinstance: pointer to per adapter instance structure
4944  *
4945  * Return value
4946  *  none
4947  */
4948 static void pmcraid_release_hcams(struct pmcraid_instance *pinstance)
4949 {
4950         if (pinstance->ccn.msg != NULL) {
4951                 pci_free_consistent(pinstance->pdev,
4952                                     PMCRAID_AEN_HDR_SIZE +
4953                                     sizeof(struct pmcraid_hcam_ccn_ext),
4954                                     pinstance->ccn.msg,
4955                                     pinstance->ccn.baddr);
4956
4957                 pinstance->ccn.msg = NULL;
4958                 pinstance->ccn.hcam = NULL;
4959                 pinstance->ccn.baddr = 0;
4960         }
4961
4962         if (pinstance->ldn.msg != NULL) {
4963                 pci_free_consistent(pinstance->pdev,
4964                                     PMCRAID_AEN_HDR_SIZE +
4965                                     sizeof(struct pmcraid_hcam_ldn),
4966                                     pinstance->ldn.msg,
4967                                     pinstance->ldn.baddr);
4968
4969                 pinstance->ldn.msg = NULL;
4970                 pinstance->ldn.hcam = NULL;
4971                 pinstance->ldn.baddr = 0;
4972         }
4973 }
4974
4975 /**
4976  * pmcraid_allocate_hcams - allocates HCAM buffers
4977  * @pinstance : pointer to per adapter instance structure
4978  *
4979  * Return Value:
4980  *   0 in case of successful allocation, non-zero otherwise
4981  */
4982 static int pmcraid_allocate_hcams(struct pmcraid_instance *pinstance)
4983 {
4984         pinstance->ccn.msg = pci_alloc_consistent(
4985                                         pinstance->pdev,
4986                                         PMCRAID_AEN_HDR_SIZE +
4987                                         sizeof(struct pmcraid_hcam_ccn_ext),
4988                                         &(pinstance->ccn.baddr));
4989
4990         pinstance->ldn.msg = pci_alloc_consistent(
4991                                         pinstance->pdev,
4992                                         PMCRAID_AEN_HDR_SIZE +
4993                                         sizeof(struct pmcraid_hcam_ldn),
4994                                         &(pinstance->ldn.baddr));
4995
4996         if (pinstance->ldn.msg == NULL || pinstance->ccn.msg == NULL) {
4997                 pmcraid_release_hcams(pinstance);
4998         } else {
4999                 pinstance->ccn.hcam =
5000                         (void *)pinstance->ccn.msg + PMCRAID_AEN_HDR_SIZE;
5001                 pinstance->ldn.hcam =
5002                         (void *)pinstance->ldn.msg + PMCRAID_AEN_HDR_SIZE;
5003
5004                 atomic_set(&pinstance->ccn.ignore, 0);
5005                 atomic_set(&pinstance->ldn.ignore, 0);
5006         }
5007
5008         return (pinstance->ldn.msg == NULL) ? -ENOMEM : 0;
5009 }
5010
5011 /**
5012  * pmcraid_release_config_buffers - release config.table buffers
5013  * @pinstance: pointer to per adapter instance structure
5014  *
5015  * Return Value
5016  *       none
5017  */
5018 static void pmcraid_release_config_buffers(struct pmcraid_instance *pinstance)
5019 {
5020         if (pinstance->cfg_table != NULL &&
5021             pinstance->cfg_table_bus_addr != 0) {
5022                 pci_free_consistent(pinstance->pdev,
5023                                     sizeof(struct pmcraid_config_table),
5024                                     pinstance->cfg_table,
5025                                     pinstance->cfg_table_bus_addr);
5026                 pinstance->cfg_table = NULL;
5027                 pinstance->cfg_table_bus_addr = 0;
5028         }
5029
5030         if (pinstance->res_entries != NULL) {
5031                 int i;
5032
5033                 for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
5034                         list_del(&pinstance->res_entries[i].queue);
5035                 kfree(pinstance->res_entries);
5036                 pinstance->res_entries = NULL;
5037         }
5038
5039         pmcraid_release_hcams(pinstance);
5040 }
5041
5042 /**
5043  * pmcraid_allocate_config_buffers - allocates DMAable memory for config table
5044  * @pinstance : pointer to per adapter instance structure
5045  *
5046  * Return Value
5047  *      0 for successful allocation, -ENOMEM for any failure
5048  */
5049 static int pmcraid_allocate_config_buffers(struct pmcraid_instance *pinstance)
5050 {
5051         int i;
5052
5053         pinstance->res_entries =
5054                         kzalloc(sizeof(struct pmcraid_resource_entry) *
5055                                 PMCRAID_MAX_RESOURCES, GFP_KERNEL);
5056
5057         if (NULL == pinstance->res_entries) {
5058                 pmcraid_err("failed to allocate memory for resource table\n");
5059                 return -ENOMEM;
5060         }
5061
5062         for (i = 0; i < PMCRAID_MAX_RESOURCES; i++)
5063                 list_add_tail(&pinstance->res_entries[i].queue,
5064                               &pinstance->free_res_q);
5065
5066         pinstance->cfg_table =
5067                 pci_alloc_consistent(pinstance->pdev,
5068                                      sizeof(struct pmcraid_config_table),
5069                                      &pinstance->cfg_table_bus_addr);
5070
5071         if (NULL == pinstance->cfg_table) {
5072                 pmcraid_err("couldn't alloc DMA memory for config table\n");
5073                 pmcraid_release_config_buffers(pinstance);
5074                 return -ENOMEM;
5075         }
5076
5077         if (pmcraid_allocate_hcams(pinstance)) {
5078                 pmcraid_err("could not alloc DMA memory for HCAMS\n");
5079                 pmcraid_release_config_buffers(pinstance);
5080                 return -ENOMEM;
5081         }
5082
5083         return 0;
5084 }
5085
5086 /**
5087  * pmcraid_init_tasklets - registers tasklets for response handling
5088  *
5089  * @pinstance: pointer adapter instance structure
5090  *
5091  * Return value
5092  *      none
5093  */
5094 static void pmcraid_init_tasklets(struct pmcraid_instance *pinstance)
5095 {
5096         int i;
5097         for (i = 0; i < pinstance->num_hrrq; i++)
5098                 tasklet_init(&pinstance->isr_tasklet[i],
5099                              pmcraid_tasklet_function,
5100                              (unsigned long)&pinstance->hrrq_vector[i]);
5101 }
5102
5103 /**
5104  * pmcraid_kill_tasklets - destroys tasklets registered for response handling
5105  *
5106  * @pinstance: pointer to adapter instance structure
5107  *
5108  * Return value
5109  *      none
5110  */
5111 static void pmcraid_kill_tasklets(struct pmcraid_instance *pinstance)
5112 {
5113         int i;
5114         for (i = 0; i < pinstance->num_hrrq; i++)
5115                 tasklet_kill(&pinstance->isr_tasklet[i]);
5116 }
5117
5118 /**
5119  * pmcraid_release_buffers - release per-adapter buffers allocated
5120  *
5121  * @pinstance: pointer to adapter soft state
5122  *
5123  * Return Value
5124  *      none
5125  */
5126 static void pmcraid_release_buffers(struct pmcraid_instance *pinstance)
5127 {
5128         pmcraid_release_config_buffers(pinstance);
5129         pmcraid_release_control_blocks(pinstance, PMCRAID_MAX_CMD);
5130         pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5131         pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5132
5133         if (pinstance->inq_data != NULL) {
5134                 pci_free_consistent(pinstance->pdev,
5135                                     sizeof(struct pmcraid_inquiry_data),
5136                                     pinstance->inq_data,
5137                                     pinstance->inq_data_baddr);
5138
5139                 pinstance->inq_data = NULL;
5140                 pinstance->inq_data_baddr = 0;
5141         }
5142
5143         if (pinstance->timestamp_data != NULL) {
5144                 pci_free_consistent(pinstance->pdev,
5145                                     sizeof(struct pmcraid_timestamp_data),
5146                                     pinstance->timestamp_data,
5147                                     pinstance->timestamp_data_baddr);
5148
5149                 pinstance->timestamp_data = NULL;
5150                 pinstance->timestamp_data_baddr = 0;
5151         }
5152 }
5153
5154 /**
5155  * pmcraid_init_buffers - allocates memory and initializes various structures
5156  * @pinstance: pointer to per adapter instance structure
5157  *
5158  * This routine pre-allocates memory based on the type of block as below:
5159  * cmdblocks(PMCRAID_MAX_CMD): kernel memory using kernel's slab_allocator,
5160  * IOARCBs(PMCRAID_MAX_CMD)  : DMAable memory, using pci pool allocator
5161  * config-table entries      : DMAable memory using pci_alloc_consistent
5162  * HostRRQs                  : DMAable memory, using pci_alloc_consistent
5163  *
5164  * Return Value
5165  *       0 in case all of the blocks are allocated, -ENOMEM otherwise.
5166  */
5167 static int pmcraid_init_buffers(struct pmcraid_instance *pinstance)
5168 {
5169         int i;
5170
5171         if (pmcraid_allocate_host_rrqs(pinstance)) {
5172                 pmcraid_err("couldn't allocate memory for %d host rrqs\n",
5173                              pinstance->num_hrrq);
5174                 return -ENOMEM;
5175         }
5176
5177         if (pmcraid_allocate_config_buffers(pinstance)) {
5178                 pmcraid_err("couldn't allocate memory for config buffers\n");
5179                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5180                 return -ENOMEM;
5181         }
5182
5183         if (pmcraid_allocate_cmd_blocks(pinstance)) {
5184                 pmcraid_err("couldn't allocate memory for cmd blocks\n");
5185                 pmcraid_release_config_buffers(pinstance);
5186                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5187                 return -ENOMEM;
5188         }
5189
5190         if (pmcraid_allocate_control_blocks(pinstance)) {
5191                 pmcraid_err("couldn't allocate memory control blocks\n");
5192                 pmcraid_release_config_buffers(pinstance);
5193                 pmcraid_release_cmd_blocks(pinstance, PMCRAID_MAX_CMD);
5194                 pmcraid_release_host_rrqs(pinstance, pinstance->num_hrrq);
5195                 return -ENOMEM;
5196         }
5197
5198         /* allocate DMAable memory for page D0 INQUIRY buffer */
5199         pinstance->inq_data = pci_alloc_consistent(
5200                                         pinstance->pdev,
5201                                         sizeof(struct pmcraid_inquiry_data),
5202                                         &pinstance->inq_data_baddr);
5203
5204         if (pinstance->inq_data == NULL) {
5205                 pmcraid_err("couldn't allocate DMA memory for INQUIRY\n");
5206                 pmcraid_release_buffers(pinstance);
5207                 return -ENOMEM;
5208         }
5209
5210         /* allocate DMAable memory for set timestamp data buffer */
5211         pinstance->timestamp_data = pci_alloc_consistent(
5212                                         pinstance->pdev,
5213                                         sizeof(struct pmcraid_timestamp_data),
5214                                         &pinstance->timestamp_data_baddr);
5215
5216         if (pinstance->timestamp_data == NULL) {
5217                 pmcraid_err("couldn't allocate DMA memory for \
5218                                 set time_stamp \n");
5219                 pmcraid_release_buffers(pinstance);
5220                 return -ENOMEM;
5221         }
5222
5223
5224         /* Initialize all the command blocks and add them to free pool. No
5225          * need to lock (free_pool_lock) as this is done in initialization
5226          * itself
5227          */
5228         for (i = 0; i < PMCRAID_MAX_CMD; i++) {
5229                 struct pmcraid_cmd *cmdp = pinstance->cmd_list[i];
5230                 pmcraid_init_cmdblk(cmdp, i);
5231                 cmdp->drv_inst = pinstance;
5232                 list_add_tail(&cmdp->free_list, &pinstance->free_cmd_pool);
5233         }
5234
5235         return 0;
5236 }
5237
5238 /**
5239  * pmcraid_reinit_buffers - resets various buffer pointers
5240  * @pinstance: pointer to adapter instance
5241  * Return value
5242  *      none
5243  */
5244 static void pmcraid_reinit_buffers(struct pmcraid_instance *pinstance)
5245 {
5246         int i;
5247         int buffer_size = HRRQ_ENTRY_SIZE * PMCRAID_MAX_CMD;
5248
5249         for (i = 0; i < pinstance->num_hrrq; i++) {
5250                 memset(pinstance->hrrq_start[i], 0, buffer_size);
5251                 pinstance->hrrq_curr[i] = pinstance->hrrq_start[i];
5252                 pinstance->hrrq_end[i] =
5253                         pinstance->hrrq_start[i] + PMCRAID_MAX_CMD - 1;
5254                 pinstance->host_toggle_bit[i] = 1;
5255         }
5256 }
5257
5258 /**
5259  * pmcraid_init_instance - initialize per instance data structure
5260  * @pdev: pointer to pci device structure
5261  * @host: pointer to Scsi_Host structure
5262  * @mapped_pci_addr: memory mapped IOA configuration registers
5263  *
5264  * Return Value
5265  *       0 on success, non-zero in case of any failure
5266  */
5267 static int pmcraid_init_instance(struct pci_dev *pdev, struct Scsi_Host *host,
5268                                  void __iomem *mapped_pci_addr)
5269 {
5270         struct pmcraid_instance *pinstance =
5271                 (struct pmcraid_instance *)host->hostdata;
5272
5273         pinstance->host = host;
5274         pinstance->pdev = pdev;
5275
5276         /* Initialize register addresses */
5277         pinstance->mapped_dma_addr = mapped_pci_addr;
5278
5279         /* Initialize chip-specific details */
5280         {
5281                 struct pmcraid_chip_details *chip_cfg = pinstance->chip_cfg;
5282                 struct pmcraid_interrupts *pint_regs = &pinstance->int_regs;
5283
5284                 pinstance->ioarrin = mapped_pci_addr + chip_cfg->ioarrin;
5285
5286                 pint_regs->ioa_host_interrupt_reg =
5287                         mapped_pci_addr + chip_cfg->ioa_host_intr;
5288                 pint_regs->ioa_host_interrupt_clr_reg =
5289                         mapped_pci_addr + chip_cfg->ioa_host_intr_clr;
5290                 pint_regs->ioa_host_msix_interrupt_reg =
5291                         mapped_pci_addr + chip_cfg->ioa_host_msix_intr;
5292                 pint_regs->host_ioa_interrupt_reg =
5293                         mapped_pci_addr + chip_cfg->host_ioa_intr;
5294                 pint_regs->host_ioa_interrupt_clr_reg =
5295                         mapped_pci_addr + chip_cfg->host_ioa_intr_clr;
5296
5297                 /* Current version of firmware exposes interrupt mask set
5298                  * and mask clr registers through memory mapped bar0.
5299                  */
5300                 pinstance->mailbox = mapped_pci_addr + chip_cfg->mailbox;
5301                 pinstance->ioa_status = mapped_pci_addr + chip_cfg->ioastatus;
5302                 pint_regs->ioa_host_interrupt_mask_reg =
5303                         mapped_pci_addr + chip_cfg->ioa_host_mask;
5304                 pint_regs->ioa_host_interrupt_mask_clr_reg =
5305                         mapped_pci_addr + chip_cfg->ioa_host_mask_clr;
5306                 pint_regs->global_interrupt_mask_reg =
5307                         mapped_pci_addr + chip_cfg->global_intr_mask;
5308         };
5309
5310         pinstance->ioa_reset_attempts = 0;
5311         init_waitqueue_head(&pinstance->reset_wait_q);
5312
5313         atomic_set(&pinstance->outstanding_cmds, 0);
5314         atomic_set(&pinstance->last_message_id, 0);
5315         atomic_set(&pinstance->expose_resources, 0);
5316
5317         INIT_LIST_HEAD(&pinstance->free_res_q);
5318         INIT_LIST_HEAD(&pinstance->used_res_q);
5319         INIT_LIST_HEAD(&pinstance->free_cmd_pool);
5320         INIT_LIST_HEAD(&pinstance->pending_cmd_pool);
5321
5322         spin_lock_init(&pinstance->free_pool_lock);
5323         spin_lock_init(&pinstance->pending_pool_lock);
5324         spin_lock_init(&pinstance->resource_lock);
5325         mutex_init(&pinstance->aen_queue_lock);
5326
5327         /* Work-queue (Shared) for deferred processing error handling */
5328         INIT_WORK(&pinstance->worker_q, pmcraid_worker_function);
5329
5330         /* Initialize the default log_level */
5331         pinstance->current_log_level = pmcraid_log_level;
5332
5333         /* Setup variables required for reset engine */
5334         pinstance->ioa_state = IOA_STATE_UNKNOWN;
5335         pinstance->reset_cmd = NULL;
5336         return 0;
5337 }
5338
5339 /**
5340  * pmcraid_shutdown - shutdown adapter controller.
5341  * @pdev: pci device struct
5342  *
5343  * Issues an adapter shutdown to the card waits for its completion
5344  *
5345  * Return value
5346  *        none
5347  */
5348 static void pmcraid_shutdown(struct pci_dev *pdev)
5349 {
5350         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5351         pmcraid_reset_bringdown(pinstance);
5352 }
5353
5354
5355 /**
5356  * pmcraid_get_minor - returns unused minor number from minor number bitmap
5357  */
5358 static unsigned short pmcraid_get_minor(void)
5359 {
5360         int minor;
5361
5362         minor = find_first_zero_bit(pmcraid_minor, sizeof(pmcraid_minor));
5363         __set_bit(minor, pmcraid_minor);
5364         return minor;
5365 }
5366
5367 /**
5368  * pmcraid_release_minor - releases given minor back to minor number bitmap
5369  */
5370 static void pmcraid_release_minor(unsigned short minor)
5371 {
5372         __clear_bit(minor, pmcraid_minor);
5373 }
5374
5375 /**
5376  * pmcraid_setup_chrdev - allocates a minor number and registers a char device
5377  *
5378  * @pinstance: pointer to adapter instance for which to register device
5379  *
5380  * Return value
5381  *      0 in case of success, otherwise non-zero
5382  */
5383 static int pmcraid_setup_chrdev(struct pmcraid_instance *pinstance)
5384 {
5385         int minor;
5386         int error;
5387
5388         minor = pmcraid_get_minor();
5389         cdev_init(&pinstance->cdev, &pmcraid_fops);
5390         pinstance->cdev.owner = THIS_MODULE;
5391
5392         error = cdev_add(&pinstance->cdev, MKDEV(pmcraid_major, minor), 1);
5393
5394         if (error)
5395                 pmcraid_release_minor(minor);
5396         else
5397                 device_create(pmcraid_class, NULL, MKDEV(pmcraid_major, minor),
5398                               NULL, "%s%u", PMCRAID_DEVFILE, minor);
5399         return error;
5400 }
5401
5402 /**
5403  * pmcraid_release_chrdev - unregisters per-adapter management interface
5404  *
5405  * @pinstance: pointer to adapter instance structure
5406  *
5407  * Return value
5408  *  none
5409  */
5410 static void pmcraid_release_chrdev(struct pmcraid_instance *pinstance)
5411 {
5412         pmcraid_release_minor(MINOR(pinstance->cdev.dev));
5413         device_destroy(pmcraid_class,
5414                        MKDEV(pmcraid_major, MINOR(pinstance->cdev.dev)));
5415         cdev_del(&pinstance->cdev);
5416 }
5417
5418 /**
5419  * pmcraid_remove - IOA hot plug remove entry point
5420  * @pdev: pci device struct
5421  *
5422  * Return value
5423  *        none
5424  */
5425 static void pmcraid_remove(struct pci_dev *pdev)
5426 {
5427         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5428
5429         /* remove the management interface (/dev file) for this device */
5430         pmcraid_release_chrdev(pinstance);
5431
5432         /* remove host template from scsi midlayer */
5433         scsi_remove_host(pinstance->host);
5434
5435         /* block requests from mid-layer */
5436         scsi_block_requests(pinstance->host);
5437
5438         /* initiate shutdown adapter */
5439         pmcraid_shutdown(pdev);
5440
5441         pmcraid_disable_interrupts(pinstance, ~0);
5442         flush_work(&pinstance->worker_q);
5443
5444         pmcraid_kill_tasklets(pinstance);
5445         pmcraid_unregister_interrupt_handler(pinstance);
5446         pmcraid_release_buffers(pinstance);
5447         iounmap(pinstance->mapped_dma_addr);
5448         pci_release_regions(pdev);
5449         scsi_host_put(pinstance->host);
5450         pci_disable_device(pdev);
5451
5452         return;
5453 }
5454
5455 #ifdef CONFIG_PM
5456 /**
5457  * pmcraid_suspend - driver suspend entry point for power management
5458  * @pdev:   PCI device structure
5459  * @state:  PCI power state to suspend routine
5460  *
5461  * Return Value - 0 always
5462  */
5463 static int pmcraid_suspend(struct pci_dev *pdev, pm_message_t state)
5464 {
5465         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5466
5467         pmcraid_shutdown(pdev);
5468         pmcraid_disable_interrupts(pinstance, ~0);
5469         pmcraid_kill_tasklets(pinstance);
5470         pci_set_drvdata(pinstance->pdev, pinstance);
5471         pmcraid_unregister_interrupt_handler(pinstance);
5472         pci_save_state(pdev);
5473         pci_disable_device(pdev);
5474         pci_set_power_state(pdev, pci_choose_state(pdev, state));
5475
5476         return 0;
5477 }
5478
5479 /**
5480  * pmcraid_resume - driver resume entry point PCI power management
5481  * @pdev: PCI device structure
5482  *
5483  * Return Value - 0 in case of success. Error code in case of any failure
5484  */
5485 static int pmcraid_resume(struct pci_dev *pdev)
5486 {
5487         struct pmcraid_instance *pinstance = pci_get_drvdata(pdev);
5488         struct Scsi_Host *host = pinstance->host;
5489         int rc;
5490
5491         pci_set_power_state(pdev, PCI_D0);
5492         pci_enable_wake(pdev, PCI_D0, 0);
5493         pci_restore_state(pdev);
5494
5495         rc = pci_enable_device(pdev);
5496
5497         if (rc) {
5498                 dev_err(&pdev->dev, "resume: Enable device failed\n");
5499                 return rc;
5500         }
5501
5502         pci_set_master(pdev);
5503
5504         if ((sizeof(dma_addr_t) == 4) ||
5505              pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5506                 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5507
5508         if (rc == 0)
5509                 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5510
5511         if (rc != 0) {
5512                 dev_err(&pdev->dev, "resume: Failed to set PCI DMA mask\n");
5513                 goto disable_device;
5514         }
5515
5516         pmcraid_disable_interrupts(pinstance, ~0);
5517         atomic_set(&pinstance->outstanding_cmds, 0);
5518         rc = pmcraid_register_interrupt_handler(pinstance);
5519
5520         if (rc) {
5521                 dev_err(&pdev->dev,
5522                         "resume: couldn't register interrupt handlers\n");
5523                 rc = -ENODEV;
5524                 goto release_host;
5525         }
5526
5527         pmcraid_init_tasklets(pinstance);
5528         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5529
5530         /* Start with hard reset sequence which brings up IOA to operational
5531          * state as well as completes the reset sequence.
5532          */
5533         pinstance->ioa_hard_reset = 1;
5534
5535         /* Start IOA firmware initialization and bring card to Operational
5536          * state.
5537          */
5538         if (pmcraid_reset_bringup(pinstance)) {
5539                 dev_err(&pdev->dev, "couldn't initialize IOA\n");
5540                 rc = -ENODEV;
5541                 goto release_tasklets;
5542         }
5543
5544         return 0;
5545
5546 release_tasklets:
5547         pmcraid_disable_interrupts(pinstance, ~0);
5548         pmcraid_kill_tasklets(pinstance);
5549         pmcraid_unregister_interrupt_handler(pinstance);
5550
5551 release_host:
5552         scsi_host_put(host);
5553
5554 disable_device:
5555         pci_disable_device(pdev);
5556
5557         return rc;
5558 }
5559
5560 #else
5561
5562 #define pmcraid_suspend NULL
5563 #define pmcraid_resume  NULL
5564
5565 #endif /* CONFIG_PM */
5566
5567 /**
5568  * pmcraid_complete_ioa_reset - Called by either timer or tasklet during
5569  *                              completion of the ioa reset
5570  * @cmd: pointer to reset command block
5571  */
5572 static void pmcraid_complete_ioa_reset(struct pmcraid_cmd *cmd)
5573 {
5574         struct pmcraid_instance *pinstance = cmd->drv_inst;
5575         unsigned long flags;
5576
5577         spin_lock_irqsave(pinstance->host->host_lock, flags);
5578         pmcraid_ioa_reset(cmd);
5579         spin_unlock_irqrestore(pinstance->host->host_lock, flags);
5580         scsi_unblock_requests(pinstance->host);
5581         schedule_work(&pinstance->worker_q);
5582 }
5583
5584 /**
5585  * pmcraid_set_supported_devs - sends SET SUPPORTED DEVICES to IOAFP
5586  *
5587  * @cmd: pointer to pmcraid_cmd structure
5588  *
5589  * Return Value
5590  *  0 for success or non-zero for failure cases
5591  */
5592 static void pmcraid_set_supported_devs(struct pmcraid_cmd *cmd)
5593 {
5594         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5595         void (*cmd_done) (struct pmcraid_cmd *) = pmcraid_complete_ioa_reset;
5596
5597         pmcraid_reinit_cmdblk(cmd);
5598
5599         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5600         ioarcb->request_type = REQ_TYPE_IOACMD;
5601         ioarcb->cdb[0] = PMCRAID_SET_SUPPORTED_DEVICES;
5602         ioarcb->cdb[1] = ALL_DEVICES_SUPPORTED;
5603
5604         /* If this was called as part of resource table reinitialization due to
5605          * lost CCN, it is enough to return the command block back to free pool
5606          * as part of set_supported_devs completion function.
5607          */
5608         if (cmd->drv_inst->reinit_cfg_table) {
5609                 cmd->drv_inst->reinit_cfg_table = 0;
5610                 cmd->release = 1;
5611                 cmd_done = pmcraid_reinit_cfgtable_done;
5612         }
5613
5614         /* we will be done with the reset sequence after set supported devices,
5615          * setup the done function to return the command block back to free
5616          * pool
5617          */
5618         pmcraid_send_cmd(cmd,
5619                          cmd_done,
5620                          PMCRAID_SET_SUP_DEV_TIMEOUT,
5621                          pmcraid_timeout_handler);
5622         return;
5623 }
5624
5625 /**
5626  * pmcraid_set_timestamp - set the timestamp to IOAFP
5627  *
5628  * @cmd: pointer to pmcraid_cmd structure
5629  *
5630  * Return Value
5631  *  0 for success or non-zero for failure cases
5632  */
5633 static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
5634 {
5635         struct pmcraid_instance *pinstance = cmd->drv_inst;
5636         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5637         __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
5638         struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5639
5640         struct timeval tv;
5641         __le64 timestamp;
5642
5643         do_gettimeofday(&tv);
5644         timestamp = tv.tv_sec * 1000;
5645
5646         pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
5647         pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);
5648         pinstance->timestamp_data->timestamp[2] = (__u8)((timestamp) >> 16);
5649         pinstance->timestamp_data->timestamp[3] = (__u8)((timestamp) >> 24);
5650         pinstance->timestamp_data->timestamp[4] = (__u8)((timestamp) >> 32);
5651         pinstance->timestamp_data->timestamp[5] = (__u8)((timestamp)  >> 40);
5652
5653         pmcraid_reinit_cmdblk(cmd);
5654         ioarcb->request_type = REQ_TYPE_SCSI;
5655         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5656         ioarcb->cdb[0] = PMCRAID_SCSI_SET_TIMESTAMP;
5657         ioarcb->cdb[1] = PMCRAID_SCSI_SERVICE_ACTION;
5658         memcpy(&(ioarcb->cdb[6]), &time_stamp_len, sizeof(time_stamp_len));
5659
5660         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5661                                         offsetof(struct pmcraid_ioarcb,
5662                                                 add_data.u.ioadl[0]));
5663         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5664         ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5665
5666         ioarcb->request_flags0 |= NO_LINK_DESCS;
5667         ioarcb->request_flags0 |= TRANSFER_DIR_WRITE;
5668         ioarcb->data_transfer_length =
5669                 cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5670         ioadl = &(ioarcb->add_data.u.ioadl[0]);
5671         ioadl->flags = IOADL_FLAGS_LAST_DESC;
5672         ioadl->address = cpu_to_le64(pinstance->timestamp_data_baddr);
5673         ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_timestamp_data));
5674
5675         if (!pinstance->timestamp_error) {
5676                 pinstance->timestamp_error = 0;
5677                 pmcraid_send_cmd(cmd, pmcraid_set_supported_devs,
5678                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5679         } else {
5680                 pmcraid_send_cmd(cmd, pmcraid_return_cmd,
5681                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5682                 return;
5683         }
5684 }
5685
5686
5687 /**
5688  * pmcraid_init_res_table - Initialize the resource table
5689  * @cmd:  pointer to pmcraid command struct
5690  *
5691  * This function looks through the existing resource table, comparing
5692  * it with the config table. This function will take care of old/new
5693  * devices and schedule adding/removing them from the mid-layer
5694  * as appropriate.
5695  *
5696  * Return value
5697  *       None
5698  */
5699 static void pmcraid_init_res_table(struct pmcraid_cmd *cmd)
5700 {
5701         struct pmcraid_instance *pinstance = cmd->drv_inst;
5702         struct pmcraid_resource_entry *res, *temp;
5703         struct pmcraid_config_table_entry *cfgte;
5704         unsigned long lock_flags;
5705         int found, rc, i;
5706         u16 fw_version;
5707         LIST_HEAD(old_res);
5708
5709         if (pinstance->cfg_table->flags & MICROCODE_UPDATE_REQUIRED)
5710                 pmcraid_err("IOA requires microcode download\n");
5711
5712         fw_version = be16_to_cpu(pinstance->inq_data->fw_version);
5713
5714         /* resource list is protected by pinstance->resource_lock.
5715          * init_res_table can be called from probe (user-thread) or runtime
5716          * reset (timer/tasklet)
5717          */
5718         spin_lock_irqsave(&pinstance->resource_lock, lock_flags);
5719
5720         list_for_each_entry_safe(res, temp, &pinstance->used_res_q, queue)
5721                 list_move_tail(&res->queue, &old_res);
5722
5723         for (i = 0; i < pinstance->cfg_table->num_entries; i++) {
5724                 if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5725                                                 PMCRAID_FW_VERSION_1)
5726                         cfgte = &pinstance->cfg_table->entries[i];
5727                 else
5728                         cfgte = (struct pmcraid_config_table_entry *)
5729                                         &pinstance->cfg_table->entries_ext[i];
5730
5731                 if (!pmcraid_expose_resource(fw_version, cfgte))
5732                         continue;
5733
5734                 found = 0;
5735
5736                 /* If this entry was already detected and initialized */
5737                 list_for_each_entry_safe(res, temp, &old_res, queue) {
5738
5739                         rc = memcmp(&res->cfg_entry.resource_address,
5740                                     &cfgte->resource_address,
5741                                     sizeof(cfgte->resource_address));
5742                         if (!rc) {
5743                                 list_move_tail(&res->queue,
5744                                                 &pinstance->used_res_q);
5745                                 found = 1;
5746                                 break;
5747                         }
5748                 }
5749
5750                 /* If this is new entry, initialize it and add it the queue */
5751                 if (!found) {
5752
5753                         if (list_empty(&pinstance->free_res_q)) {
5754                                 pmcraid_err("Too many devices attached\n");
5755                                 break;
5756                         }
5757
5758                         found = 1;
5759                         res = list_entry(pinstance->free_res_q.next,
5760                                          struct pmcraid_resource_entry, queue);
5761
5762                         res->scsi_dev = NULL;
5763                         res->change_detected = RES_CHANGE_ADD;
5764                         res->reset_progress = 0;
5765                         list_move_tail(&res->queue, &pinstance->used_res_q);
5766                 }
5767
5768                 /* copy new configuration table entry details into driver
5769                  * maintained resource entry
5770                  */
5771                 if (found) {
5772                         memcpy(&res->cfg_entry, cfgte,
5773                                         pinstance->config_table_entry_size);
5774                         pmcraid_info("New res type:%x, vset:%x, addr:%x:\n",
5775                                  res->cfg_entry.resource_type,
5776                                  (fw_version <= PMCRAID_FW_VERSION_1 ?
5777                                         res->cfg_entry.unique_flags1 :
5778                                                 res->cfg_entry.array_id & 0xFF),
5779                                  le32_to_cpu(res->cfg_entry.resource_address));
5780                 }
5781         }
5782
5783         /* Detect any deleted entries, mark them for deletion from mid-layer */
5784         list_for_each_entry_safe(res, temp, &old_res, queue) {
5785
5786                 if (res->scsi_dev) {
5787                         res->change_detected = RES_CHANGE_DEL;
5788                         res->cfg_entry.resource_handle =
5789                                 PMCRAID_INVALID_RES_HANDLE;
5790                         list_move_tail(&res->queue, &pinstance->used_res_q);
5791                 } else {
5792                         list_move_tail(&res->queue, &pinstance->free_res_q);
5793                 }
5794         }
5795
5796         /* release the resource list lock */
5797         spin_unlock_irqrestore(&pinstance->resource_lock, lock_flags);
5798         pmcraid_set_timestamp(cmd);
5799 }
5800
5801 /**
5802  * pmcraid_querycfg - Send a Query IOA Config to the adapter.
5803  * @cmd: pointer pmcraid_cmd struct
5804  *
5805  * This function sends a Query IOA Configuration command to the adapter to
5806  * retrieve the IOA configuration table.
5807  *
5808  * Return value:
5809  *      none
5810  */
5811 static void pmcraid_querycfg(struct pmcraid_cmd *cmd)
5812 {
5813         struct pmcraid_ioarcb *ioarcb = &cmd->ioa_cb->ioarcb;
5814         struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
5815         struct pmcraid_instance *pinstance = cmd->drv_inst;
5816         int cfg_table_size = cpu_to_be32(sizeof(struct pmcraid_config_table));
5817
5818         if (be16_to_cpu(pinstance->inq_data->fw_version) <=
5819                                         PMCRAID_FW_VERSION_1)
5820                 pinstance->config_table_entry_size =
5821                         sizeof(struct pmcraid_config_table_entry);
5822         else
5823                 pinstance->config_table_entry_size =
5824                         sizeof(struct pmcraid_config_table_entry_ext);
5825
5826         ioarcb->request_type = REQ_TYPE_IOACMD;
5827         ioarcb->resource_handle = cpu_to_le32(PMCRAID_IOA_RES_HANDLE);
5828
5829         ioarcb->cdb[0] = PMCRAID_QUERY_IOA_CONFIG;
5830
5831         /* firmware requires 4-byte length field, specified in B.E format */
5832         memcpy(&(ioarcb->cdb[10]), &cfg_table_size, sizeof(cfg_table_size));
5833
5834         /* Since entire config table can be described by single IOADL, it can
5835          * be part of IOARCB itself
5836          */
5837         ioarcb->ioadl_bus_addr = cpu_to_le64((cmd->ioa_cb_bus_addr) +
5838                                         offsetof(struct pmcraid_ioarcb,
5839                                                 add_data.u.ioadl[0]));
5840         ioarcb->ioadl_length = cpu_to_le32(sizeof(struct pmcraid_ioadl_desc));
5841         ioarcb->ioarcb_bus_addr &= ~(0x1FULL);
5842
5843         ioarcb->request_flags0 |= NO_LINK_DESCS;
5844         ioarcb->data_transfer_length =
5845                 cpu_to_le32(sizeof(struct pmcraid_config_table));
5846
5847         ioadl = &(ioarcb->add_data.u.ioadl[0]);
5848         ioadl->flags = IOADL_FLAGS_LAST_DESC;
5849         ioadl->address = cpu_to_le64(pinstance->cfg_table_bus_addr);
5850         ioadl->data_len = cpu_to_le32(sizeof(struct pmcraid_config_table));
5851
5852         pmcraid_send_cmd(cmd, pmcraid_init_res_table,
5853                          PMCRAID_INTERNAL_TIMEOUT, pmcraid_timeout_handler);
5854 }
5855
5856
5857 /**
5858  * pmcraid_probe - PCI probe entry pointer for PMC MaxRAID controller driver
5859  * @pdev: pointer to pci device structure
5860  * @dev_id: pointer to device ids structure
5861  *
5862  * Return Value
5863  *      returns 0 if the device is claimed and successfully configured.
5864  *      returns non-zero error code in case of any failure
5865  */
5866 static int pmcraid_probe(struct pci_dev *pdev,
5867                          const struct pci_device_id *dev_id)
5868 {
5869         struct pmcraid_instance *pinstance;
5870         struct Scsi_Host *host;
5871         void __iomem *mapped_pci_addr;
5872         int rc = PCIBIOS_SUCCESSFUL;
5873
5874         if (atomic_read(&pmcraid_adapter_count) >= PMCRAID_MAX_ADAPTERS) {
5875                 pmcraid_err
5876                         ("maximum number(%d) of supported adapters reached\n",
5877                          atomic_read(&pmcraid_adapter_count));
5878                 return -ENOMEM;
5879         }
5880
5881         atomic_inc(&pmcraid_adapter_count);
5882         rc = pci_enable_device(pdev);
5883
5884         if (rc) {
5885                 dev_err(&pdev->dev, "Cannot enable adapter\n");
5886                 atomic_dec(&pmcraid_adapter_count);
5887                 return rc;
5888         }
5889
5890         dev_info(&pdev->dev,
5891                 "Found new IOA(%x:%x), Total IOA count: %d\n",
5892                  pdev->vendor, pdev->device,
5893                  atomic_read(&pmcraid_adapter_count));
5894
5895         rc = pci_request_regions(pdev, PMCRAID_DRIVER_NAME);
5896
5897         if (rc < 0) {
5898                 dev_err(&pdev->dev,
5899                         "Couldn't register memory range of registers\n");
5900                 goto out_disable_device;
5901         }
5902
5903         mapped_pci_addr = pci_iomap(pdev, 0, 0);
5904
5905         if (!mapped_pci_addr) {
5906                 dev_err(&pdev->dev, "Couldn't map PCI registers memory\n");
5907                 rc = -ENOMEM;
5908                 goto out_release_regions;
5909         }
5910
5911         pci_set_master(pdev);
5912
5913         /* Firmware requires the system bus address of IOARCB to be within
5914          * 32-bit addressable range though it has 64-bit IOARRIN register.
5915          * However, firmware supports 64-bit streaming DMA buffers, whereas
5916          * coherent buffers are to be 32-bit. Since pci_alloc_consistent always
5917          * returns memory within 4GB (if not, change this logic), coherent
5918          * buffers are within firmware acceptable address ranges.
5919          */
5920         if ((sizeof(dma_addr_t) == 4) ||
5921             pci_set_dma_mask(pdev, DMA_BIT_MASK(64)))
5922                 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
5923
5924         /* firmware expects 32-bit DMA addresses for IOARRIN register; set 32
5925          * bit mask for pci_alloc_consistent to return addresses within 4GB
5926          */
5927         if (rc == 0)
5928                 rc = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
5929
5930         if (rc != 0) {
5931                 dev_err(&pdev->dev, "Failed to set PCI DMA mask\n");
5932                 goto cleanup_nomem;
5933         }
5934
5935         host = scsi_host_alloc(&pmcraid_host_template,
5936                                 sizeof(struct pmcraid_instance));
5937
5938         if (!host) {
5939                 dev_err(&pdev->dev, "scsi_host_alloc failed!\n");
5940                 rc = -ENOMEM;
5941                 goto cleanup_nomem;
5942         }
5943
5944         host->max_id = PMCRAID_MAX_NUM_TARGETS_PER_BUS;
5945         host->max_lun = PMCRAID_MAX_NUM_LUNS_PER_TARGET;
5946         host->unique_id = host->host_no;
5947         host->max_channel = PMCRAID_MAX_BUS_TO_SCAN;
5948         host->max_cmd_len = PMCRAID_MAX_CDB_LEN;
5949
5950         /* zero out entire instance structure */
5951         pinstance = (struct pmcraid_instance *)host->hostdata;
5952         memset(pinstance, 0, sizeof(*pinstance));
5953
5954         pinstance->chip_cfg =
5955                 (struct pmcraid_chip_details *)(dev_id->driver_data);
5956
5957         rc = pmcraid_init_instance(pdev, host, mapped_pci_addr);
5958
5959         if (rc < 0) {
5960                 dev_err(&pdev->dev, "failed to initialize adapter instance\n");
5961                 goto out_scsi_host_put;
5962         }
5963
5964         pci_set_drvdata(pdev, pinstance);
5965
5966         /* Save PCI config-space for use following the reset */
5967         rc = pci_save_state(pinstance->pdev);
5968
5969         if (rc != 0) {
5970                 dev_err(&pdev->dev, "Failed to save PCI config space\n");
5971                 goto out_scsi_host_put;
5972         }
5973
5974         pmcraid_disable_interrupts(pinstance, ~0);
5975
5976         rc = pmcraid_register_interrupt_handler(pinstance);
5977
5978         if (rc) {
5979                 dev_err(&pdev->dev, "couldn't register interrupt handler\n");
5980                 goto out_scsi_host_put;
5981         }
5982
5983         pmcraid_init_tasklets(pinstance);
5984
5985         /* allocate verious buffers used by LLD.*/
5986         rc = pmcraid_init_buffers(pinstance);
5987
5988         if (rc) {
5989                 pmcraid_err("couldn't allocate memory blocks\n");
5990                 goto out_unregister_isr;
5991         }
5992
5993         /* check the reset type required */
5994         pmcraid_reset_type(pinstance);
5995
5996         pmcraid_enable_interrupts(pinstance, PMCRAID_PCI_INTERRUPTS);
5997
5998         /* Start IOA firmware initialization and bring card to Operational
5999          * state.
6000          */
6001         pmcraid_info("starting IOA initialization sequence\n");
6002         if (pmcraid_reset_bringup(pinstance)) {
6003                 dev_err(&pdev->dev, "couldn't initialize IOA\n");
6004                 rc = 1;
6005                 goto out_release_bufs;
6006         }
6007
6008         /* Add adapter instance into mid-layer list */
6009         rc = scsi_add_host(pinstance->host, &pdev->dev);
6010         if (rc != 0) {
6011                 pmcraid_err("couldn't add host into mid-layer: %d\n", rc);
6012                 goto out_release_bufs;
6013         }
6014
6015         scsi_scan_host(pinstance->host);
6016
6017         rc = pmcraid_setup_chrdev(pinstance);
6018
6019         if (rc != 0) {
6020                 pmcraid_err("couldn't create mgmt interface, error: %x\n",
6021                              rc);
6022                 goto out_remove_host;
6023         }
6024
6025         /* Schedule worker thread to handle CCN and take care of adding and
6026          * removing devices to OS
6027          */
6028         atomic_set(&pinstance->expose_resources, 1);
6029         schedule_work(&pinstance->worker_q);
6030         return rc;
6031
6032 out_remove_host:
6033         scsi_remove_host(host);
6034
6035 out_release_bufs:
6036         pmcraid_release_buffers(pinstance);
6037
6038 out_unregister_isr:
6039         pmcraid_kill_tasklets(pinstance);
6040         pmcraid_unregister_interrupt_handler(pinstance);
6041
6042 out_scsi_host_put:
6043         scsi_host_put(host);
6044
6045 cleanup_nomem:
6046         iounmap(mapped_pci_addr);
6047
6048 out_release_regions:
6049         pci_release_regions(pdev);
6050
6051 out_disable_device:
6052         atomic_dec(&pmcraid_adapter_count);
6053         pci_disable_device(pdev);
6054         return -ENODEV;
6055 }
6056
6057 /*
6058  * PCI driver structure of pcmraid driver
6059  */
6060 static struct pci_driver pmcraid_driver = {
6061         .name = PMCRAID_DRIVER_NAME,
6062         .id_table = pmcraid_pci_table,
6063         .probe = pmcraid_probe,
6064         .remove = pmcraid_remove,
6065         .suspend = pmcraid_suspend,
6066         .resume = pmcraid_resume,
6067         .shutdown = pmcraid_shutdown
6068 };
6069
6070 /**
6071  * pmcraid_init - module load entry point
6072  */
6073 static int __init pmcraid_init(void)
6074 {
6075         dev_t dev;
6076         int error;
6077
6078         pmcraid_info("%s Device Driver version: %s\n",
6079                          PMCRAID_DRIVER_NAME, PMCRAID_DRIVER_VERSION);
6080
6081         error = alloc_chrdev_region(&dev, 0,
6082                                     PMCRAID_MAX_ADAPTERS,
6083                                     PMCRAID_DEVFILE);
6084
6085         if (error) {
6086                 pmcraid_err("failed to get a major number for adapters\n");
6087                 goto out_init;
6088         }
6089
6090         pmcraid_major = MAJOR(dev);
6091         pmcraid_class = class_create(THIS_MODULE, PMCRAID_DEVFILE);
6092
6093         if (IS_ERR(pmcraid_class)) {
6094                 error = PTR_ERR(pmcraid_class);
6095                 pmcraid_err("failed to register with sysfs, error = %x\n",
6096                             error);
6097                 goto out_unreg_chrdev;
6098         }
6099
6100         error = pmcraid_netlink_init();
6101
6102         if (error)
6103                 goto out_unreg_chrdev;
6104
6105         error = pci_register_driver(&pmcraid_driver);
6106
6107         if (error == 0)
6108                 goto out_init;
6109
6110         pmcraid_err("failed to register pmcraid driver, error = %x\n",
6111                      error);
6112         class_destroy(pmcraid_class);
6113         pmcraid_netlink_release();
6114
6115 out_unreg_chrdev:
6116         unregister_chrdev_region(MKDEV(pmcraid_major, 0), PMCRAID_MAX_ADAPTERS);
6117
6118 out_init:
6119         return error;
6120 }
6121
6122 /**
6123  * pmcraid_exit - module unload entry point
6124  */
6125 static void __exit pmcraid_exit(void)
6126 {
6127         pmcraid_netlink_release();
6128         unregister_chrdev_region(MKDEV(pmcraid_major, 0),
6129                                  PMCRAID_MAX_ADAPTERS);
6130         pci_unregister_driver(&pmcraid_driver);
6131         class_destroy(pmcraid_class);
6132 }
6133
6134 module_init(pmcraid_init);
6135 module_exit(pmcraid_exit);