drivers/block/mtip32xx/mtip32xx.c

   1 /*
   2  * Driver for the Micron P320 SSD
   3  *   Copyright (C) 2011 Micron Technology, Inc.
   4  *
   5  * Portions of this code were derived from works subjected to the
   6  * following copyright:
   7  *    Copyright (C) 2009 Integrated Device Technology, 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  */
  20
  21 #include <linux/pci.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/ata.h>
  24 #include <linux/delay.h>
  25 #include <linux/hdreg.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/random.h>
  28 #include <linux/smp.h>
  29 #include <linux/compat.h>
  30 #include <linux/fs.h>
  31 #include <linux/module.h>
  32 #include <linux/genhd.h>
  33 #include <linux/blkdev.h>
  34 #include <linux/blk-mq.h>
  35 #include <linux/bio.h>
  36 #include <linux/dma-mapping.h>
  37 #include <linux/idr.h>
  38 #include <linux/kthread.h>
  39 #include <../drivers/ata/ahci.h>
  40 #include <linux/export.h>
  41 #include <linux/debugfs.h>
  42 #include <linux/prefetch.h>
  43 #include "mtip32xx.h"
  44
  45 #define HW_CMD_SLOT_SZ          (MTIP_MAX_COMMAND_SLOTS * 32)
  46
  47 /* DMA region containing RX Fis, Identify, RLE10, and SMART buffers */
  48 #define AHCI_RX_FIS_SZ          0x100
  49 #define AHCI_RX_FIS_OFFSET      0x0
  50 #define AHCI_IDFY_SZ            ATA_SECT_SIZE
  51 #define AHCI_IDFY_OFFSET        0x400
  52 #define AHCI_SECTBUF_SZ         ATA_SECT_SIZE
  53 #define AHCI_SECTBUF_OFFSET     0x800
  54 #define AHCI_SMARTBUF_SZ        ATA_SECT_SIZE
  55 #define AHCI_SMARTBUF_OFFSET    0xC00
  56 /* 0x100 + 0x200 + 0x200 + 0x200 is smaller than 4k but we pad it out */
  57 #define BLOCK_DMA_ALLOC_SZ      4096
  58
  59 /* DMA region containing command table (should be 8192 bytes) */
  60 #define AHCI_CMD_SLOT_SZ        sizeof(struct mtip_cmd_hdr)
  61 #define AHCI_CMD_TBL_SZ         (MTIP_MAX_COMMAND_SLOTS * AHCI_CMD_SLOT_SZ)
  62 #define AHCI_CMD_TBL_OFFSET     0x0
  63
  64 /* DMA region per command (contains header and SGL) */
  65 #define AHCI_CMD_TBL_HDR_SZ     0x80
  66 #define AHCI_CMD_TBL_HDR_OFFSET 0x0
  67 #define AHCI_CMD_TBL_SGL_SZ     (MTIP_MAX_SG * sizeof(struct mtip_cmd_sg))
  68 #define AHCI_CMD_TBL_SGL_OFFSET AHCI_CMD_TBL_HDR_SZ
  69 #define CMD_DMA_ALLOC_SZ        (AHCI_CMD_TBL_SGL_SZ + AHCI_CMD_TBL_HDR_SZ)
  70
  71
  72 #define HOST_CAP_NZDMA          (1 << 19)
  73 #define HOST_HSORG              0xFC
  74 #define HSORG_DISABLE_SLOTGRP_INTR (1<<24)
  75 #define HSORG_DISABLE_SLOTGRP_PXIS (1<<16)
  76 #define HSORG_HWREV             0xFF00
  77 #define HSORG_STYLE             0x8
  78 #define HSORG_SLOTGROUPS        0x7
  79
  80 #define PORT_COMMAND_ISSUE      0x38
  81 #define PORT_SDBV               0x7C
  82
  83 #define PORT_OFFSET             0x100
  84 #define PORT_MEM_SIZE           0x80
  85
  86 #define PORT_IRQ_ERR \
  87         (PORT_IRQ_HBUS_ERR | PORT_IRQ_IF_ERR | PORT_IRQ_CONNECT | \
  88          PORT_IRQ_PHYRDY | PORT_IRQ_UNK_FIS | PORT_IRQ_BAD_PMP | \
  89          PORT_IRQ_TF_ERR | PORT_IRQ_HBUS_DATA_ERR | PORT_IRQ_IF_NONFATAL | \
  90          PORT_IRQ_OVERFLOW)
  91 #define PORT_IRQ_LEGACY \
  92         (PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS)
  93 #define PORT_IRQ_HANDLED \
  94         (PORT_IRQ_SDB_FIS | PORT_IRQ_LEGACY | \
  95          PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR | \
  96          PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)
  97 #define DEF_PORT_IRQ \
  98         (PORT_IRQ_ERR | PORT_IRQ_LEGACY | PORT_IRQ_SDB_FIS)
  99
 100 /* product numbers */
 101 #define MTIP_PRODUCT_UNKNOWN    0x00
 102 #define MTIP_PRODUCT_ASICFPGA   0x11
 103
 104 /* Device instance number, incremented each time a device is probed. */
 105 static int instance;
 106
 107 static struct list_head online_list;
 108 static struct list_head removing_list;
 109 static spinlock_t dev_lock;
 110
 111 /*
 112  * Global variable used to hold the major block device number
 113  * allocated in mtip_init().
 114  */
 115 static int mtip_major;
 116 static struct dentry *dfs_parent;
 117 static struct dentry *dfs_device_status;
 118
 119 static u32 cpu_use[NR_CPUS];
 120
 121 static DEFINE_SPINLOCK(rssd_index_lock);
 122 static DEFINE_IDA(rssd_index_ida);
 123
 124 static int mtip_block_initialize(struct driver_data *dd);
 125
 126 #ifdef CONFIG_COMPAT
 127 struct mtip_compat_ide_task_request_s {
 128         __u8            io_ports[8];
 129         __u8            hob_ports[8];
 130         ide_reg_valid_t out_flags;
 131         ide_reg_valid_t in_flags;
 132         int             data_phase;
 133         int             req_cmd;
 134         compat_ulong_t  out_size;
 135         compat_ulong_t  in_size;
 136 };
 137 #endif
 138
 139 /*
 140  * This function check_for_surprise_removal is called
 141  * while card is removed from the system and it will
 142  * read the vendor id from the configration space
 143  *
 144  * @pdev Pointer to the pci_dev structure.
 145  *
 146  * return value
 147  *       true if device removed, else false
 148  */
 149 static bool mtip_check_surprise_removal(struct pci_dev *pdev)
 150 {
 151         u16 vendor_id = 0;
 152         struct driver_data *dd = pci_get_drvdata(pdev);
 153
 154         if (dd->sr)
 155                 return true;
 156
 157        /* Read the vendorID from the configuration space */
 158         pci_read_config_word(pdev, 0x00, &vendor_id);
 159         if (vendor_id == 0xFFFF) {
 160                 dd->sr = true;
 161                 if (dd->queue)
 162                         set_bit(QUEUE_FLAG_DEAD, &dd->queue->queue_flags);
 163                 else
 164                         dev_warn(&dd->pdev->dev,
 165                                 "%s: dd->queue is NULL\n", __func__);
 166                 return true; /* device removed */
 167         }
 168
 169         return false; /* device present */
 170 }
 171
 172 static struct mtip_cmd *mtip_get_int_command(struct driver_data *dd)
 173 {
 174         struct request *rq;
 175
 176         if (mtip_check_surprise_removal(dd->pdev))
 177                 return NULL;
 178
 179         rq = blk_mq_alloc_request(dd->queue, 0, BLK_MQ_REQ_RESERVED);
 180         if (IS_ERR(rq))
 181                 return NULL;
 182
 183         return blk_mq_rq_to_pdu(rq);
 184 }
 185
 186 static void mtip_put_int_command(struct driver_data *dd, struct mtip_cmd *cmd)
 187 {
 188         blk_put_request(blk_mq_rq_from_pdu(cmd));
 189 }
 190
 191 /*
 192  * Once we add support for one hctx per mtip group, this will change a bit
 193  */
 194 static struct request *mtip_rq_from_tag(struct driver_data *dd,
 195                                         unsigned int tag)
 196 {
 197         struct blk_mq_hw_ctx *hctx = dd->queue->queue_hw_ctx[0];
 198
 199         return blk_mq_tag_to_rq(hctx->tags, tag);
 200 }
 201
 202 static struct mtip_cmd *mtip_cmd_from_tag(struct driver_data *dd,
 203                                           unsigned int tag)
 204 {
 205         struct request *rq = mtip_rq_from_tag(dd, tag);
 206
 207         return blk_mq_rq_to_pdu(rq);
 208 }
 209
 210 /*
 211  * IO completion function.
 212  *
 213  * This completion function is called by the driver ISR when a
 214  * command that was issued by the kernel completes. It first calls the
 215  * asynchronous completion function which normally calls back into the block
 216  * layer passing the asynchronous callback data, then unmaps the
 217  * scatter list associated with the completed command, and finally
 218  * clears the allocated bit associated with the completed command.
 219  *
 220  * @port   Pointer to the port data structure.
 221  * @tag    Tag of the command.
 222  * @data   Pointer to driver_data.
 223  * @status Completion status.
 224  *
 225  * return value
 226  *      None
 227  */
 228 static void mtip_async_complete(struct mtip_port *port,
 229                                 int tag, struct mtip_cmd *cmd, int status)
 230 {
 231         struct driver_data *dd = port->dd;
 232         struct request *rq;
 233
 234         if (unlikely(!dd) || unlikely(!port))
 235                 return;
 236
 237         if (unlikely(status == PORT_IRQ_TF_ERR)) {
 238                 dev_warn(&port->dd->pdev->dev,
 239                         "Command tag %d failed due to TFE\n", tag);
 240         }
 241
 242         rq = mtip_rq_from_tag(dd, tag);
 243
 244         blk_mq_complete_request(rq, status);
 245 }
 246
 247 /*
 248  * Reset the HBA (without sleeping)
 249  *
 250  * @dd Pointer to the driver data structure.
 251  *
 252  * return value
 253  *      0       The reset was successful.
 254  *      -1      The HBA Reset bit did not clear.
 255  */
 256 static int mtip_hba_reset(struct driver_data *dd)
 257 {
 258         unsigned long timeout;
 259
 260         /* Set the reset bit */
 261         writel(HOST_RESET, dd->mmio + HOST_CTL);
 262
 263         /* Flush */
 264         readl(dd->mmio + HOST_CTL);
 265
 266         /*
 267          * Spin for up to 10 seconds waiting for reset acknowledgement. Spec
 268          * is 1 sec but in LUN failure conditions, up to 10 secs are required
 269          */
 270         timeout = jiffies + msecs_to_jiffies(10000);
 271         do {
 272                 mdelay(10);
 273                 if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))
 274                         return -1;
 275
 276         } while ((readl(dd->mmio + HOST_CTL) & HOST_RESET)
 277                  && time_before(jiffies, timeout));
 278
 279         if (readl(dd->mmio + HOST_CTL) & HOST_RESET)
 280                 return -1;
 281
 282         return 0;
 283 }
 284
 285 /*
 286  * Issue a command to the hardware.
 287  *
 288  * Set the appropriate bit in the s_active and Command Issue hardware
 289  * registers, causing hardware command processing to begin.
 290  *
 291  * @port Pointer to the port structure.
 292  * @tag  The tag of the command to be issued.
 293  *
 294  * return value
 295  *      None
 296  */
 297 static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag)
 298 {
 299         int group = tag >> 5;
 300
 301         /* guard SACT and CI registers */
 302         spin_lock(&port->cmd_issue_lock[group]);
 303         writel((1 << MTIP_TAG_BIT(tag)),
 304                         port->s_active[MTIP_TAG_INDEX(tag)]);
 305         writel((1 << MTIP_TAG_BIT(tag)),
 306                         port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 307         spin_unlock(&port->cmd_issue_lock[group]);
 308 }
 309
 310 /*
 311  * Enable/disable the reception of FIS
 312  *
 313  * @port   Pointer to the port data structure
 314  * @enable 1 to enable, 0 to disable
 315  *
 316  * return value
 317  *      Previous state: 1 enabled, 0 disabled
 318  */
 319 static int mtip_enable_fis(struct mtip_port *port, int enable)
 320 {
 321         u32 tmp;
 322
 323         /* enable FIS reception */
 324         tmp = readl(port->mmio + PORT_CMD);
 325         if (enable)
 326                 writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 327         else
 328                 writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 329
 330         /* Flush */
 331         readl(port->mmio + PORT_CMD);
 332
 333         return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX));
 334 }
 335
 336 /*
 337  * Enable/disable the DMA engine
 338  *
 339  * @port   Pointer to the port data structure
 340  * @enable 1 to enable, 0 to disable
 341  *
 342  * return value
 343  *      Previous state: 1 enabled, 0 disabled.
 344  */
 345 static int mtip_enable_engine(struct mtip_port *port, int enable)
 346 {
 347         u32 tmp;
 348
 349         /* enable FIS reception */
 350         tmp = readl(port->mmio + PORT_CMD);
 351         if (enable)
 352                 writel(tmp | PORT_CMD_START, port->mmio + PORT_CMD);
 353         else
 354                 writel(tmp & ~PORT_CMD_START, port->mmio + PORT_CMD);
 355
 356         readl(port->mmio + PORT_CMD);
 357         return (((tmp & PORT_CMD_START) == PORT_CMD_START));
 358 }
 359
 360 /*
 361  * Enables the port DMA engine and FIS reception.
 362  *
 363  * return value
 364  *      None
 365  */
 366 static inline void mtip_start_port(struct mtip_port *port)
 367 {
 368         /* Enable FIS reception */
 369         mtip_enable_fis(port, 1);
 370
 371         /* Enable the DMA engine */
 372         mtip_enable_engine(port, 1);
 373 }
 374
 375 /*
 376  * Deinitialize a port by disabling port interrupts, the DMA engine,
 377  * and FIS reception.
 378  *
 379  * @port Pointer to the port structure
 380  *
 381  * return value
 382  *      None
 383  */
 384 static inline void mtip_deinit_port(struct mtip_port *port)
 385 {
 386         /* Disable interrupts on this port */
 387         writel(0, port->mmio + PORT_IRQ_MASK);
 388
 389         /* Disable the DMA engine */
 390         mtip_enable_engine(port, 0);
 391
 392         /* Disable FIS reception */
 393         mtip_enable_fis(port, 0);
 394 }
 395
 396 /*
 397  * Initialize a port.
 398  *
 399  * This function deinitializes the port by calling mtip_deinit_port() and
 400  * then initializes it by setting the command header and RX FIS addresses,
 401  * clearing the SError register and any pending port interrupts before
 402  * re-enabling the default set of port interrupts.
 403  *
 404  * @port Pointer to the port structure.
 405  *
 406  * return value
 407  *      None
 408  */
 409 static void mtip_init_port(struct mtip_port *port)
 410 {
 411         int i;
 412         mtip_deinit_port(port);
 413
 414         /* Program the command list base and FIS base addresses */
 415         if (readl(port->dd->mmio + HOST_CAP) & HOST_CAP_64) {
 416                 writel((port->command_list_dma >> 16) >> 16,
 417                          port->mmio + PORT_LST_ADDR_HI);
 418                 writel((port->rxfis_dma >> 16) >> 16,
 419                          port->mmio + PORT_FIS_ADDR_HI);
 420         }
 421
 422         writel(port->command_list_dma & 0xFFFFFFFF,
 423                         port->mmio + PORT_LST_ADDR);
 424         writel(port->rxfis_dma & 0xFFFFFFFF, port->mmio + PORT_FIS_ADDR);
 425
 426         /* Clear SError */
 427         writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);
 428
 429         /* reset the completed registers.*/
 430         for (i = 0; i < port->dd->slot_groups; i++)
 431                 writel(0xFFFFFFFF, port->completed[i]);
 432
 433         /* Clear any pending interrupts for this port */
 434         writel(readl(port->mmio + PORT_IRQ_STAT), port->mmio + PORT_IRQ_STAT);
 435
 436         /* Clear any pending interrupts on the HBA. */
 437         writel(readl(port->dd->mmio + HOST_IRQ_STAT),
 438                                         port->dd->mmio + HOST_IRQ_STAT);
 439
 440         /* Enable port interrupts */
 441         writel(DEF_PORT_IRQ, port->mmio + PORT_IRQ_MASK);
 442 }
 443
 444 /*
 445  * Restart a port
 446  *
 447  * @port Pointer to the port data structure.
 448  *
 449  * return value
 450  *      None
 451  */
 452 static void mtip_restart_port(struct mtip_port *port)
 453 {
 454         unsigned long timeout;
 455
 456         /* Disable the DMA engine */
 457         mtip_enable_engine(port, 0);
 458
 459         /* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */
 460         timeout = jiffies + msecs_to_jiffies(500);
 461         while ((readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON)
 462                  && time_before(jiffies, timeout))
 463                 ;
 464
 465         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 466                 return;
 467
 468         /*
 469          * Chip quirk: escalate to hba reset if
 470          * PxCMD.CR not clear after 500 ms
 471          */
 472         if (readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) {
 473                 dev_warn(&port->dd->pdev->dev,
 474                         "PxCMD.CR not clear, escalating reset\n");
 475
 476                 if (mtip_hba_reset(port->dd))
 477                         dev_err(&port->dd->pdev->dev,
 478                                 "HBA reset escalation failed.\n");
 479
 480                 /* 30 ms delay before com reset to quiesce chip */
 481                 mdelay(30);
 482         }
 483
 484         dev_warn(&port->dd->pdev->dev, "Issuing COM reset\n");
 485
 486         /* Set PxSCTL.DET */
 487         writel(readl(port->mmio + PORT_SCR_CTL) |
 488                          1, port->mmio + PORT_SCR_CTL);
 489         readl(port->mmio + PORT_SCR_CTL);
 490
 491         /* Wait 1 ms to quiesce chip function */
 492         timeout = jiffies + msecs_to_jiffies(1);
 493         while (time_before(jiffies, timeout))
 494                 ;
 495
 496         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 497                 return;
 498
 499         /* Clear PxSCTL.DET */
 500         writel(readl(port->mmio + PORT_SCR_CTL) & ~1,
 501                          port->mmio + PORT_SCR_CTL);
 502         readl(port->mmio + PORT_SCR_CTL);
 503
 504         /* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */
 505         timeout = jiffies + msecs_to_jiffies(500);
 506         while (((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 507                          && time_before(jiffies, timeout))
 508                 ;
 509
 510         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 511                 return;
 512
 513         if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 514                 dev_warn(&port->dd->pdev->dev,
 515                         "COM reset failed\n");
 516
 517         mtip_init_port(port);
 518         mtip_start_port(port);
 519
 520 }
 521
 522 static int mtip_device_reset(struct driver_data *dd)
 523 {
 524         int rv = 0;
 525
 526         if (mtip_check_surprise_removal(dd->pdev))
 527                 return 0;
 528
 529         if (mtip_hba_reset(dd) < 0)
 530                 rv = -EFAULT;
 531
 532         mdelay(1);
 533         mtip_init_port(dd->port);
 534         mtip_start_port(dd->port);
 535
 536         /* Enable interrupts on the HBA. */
 537         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
 538                                         dd->mmio + HOST_CTL);
 539         return rv;
 540 }
 541
 542 /*
 543  * Helper function for tag logging
 544  */
 545 static void print_tags(struct driver_data *dd,
 546                         char *msg,
 547                         unsigned long *tagbits,
 548                         int cnt)
 549 {
 550         unsigned char tagmap[128];
 551         int group, tagmap_len = 0;
 552
 553         memset(tagmap, 0, sizeof(tagmap));
 554         for (group = SLOTBITS_IN_LONGS; group > 0; group--)
 555                 tagmap_len += sprintf(tagmap + tagmap_len, "%016lX ",
 556                                                 tagbits[group-1]);
 557         dev_warn(&dd->pdev->dev,
 558                         "%d command(s) %s: tagmap [%s]", cnt, msg, tagmap);
 559 }
 560
 561 /*
 562  * Internal command completion callback function.
 563  *
 564  * This function is normally called by the driver ISR when an internal
 565  * command completed. This function signals the command completion by
 566  * calling complete().
 567  *
 568  * @port   Pointer to the port data structure.
 569  * @tag    Tag of the command that has completed.
 570  * @data   Pointer to a completion structure.
 571  * @status Completion status.
 572  *
 573  * return value
 574  *      None
 575  */
 576 static void mtip_completion(struct mtip_port *port,
 577                             int tag, struct mtip_cmd *command, int status)
 578 {
 579         struct completion *waiting = command->comp_data;
 580         if (unlikely(status == PORT_IRQ_TF_ERR))
 581                 dev_warn(&port->dd->pdev->dev,
 582                         "Internal command %d completed with TFE\n", tag);
 583
 584         command->comp_func = NULL;
 585         command->comp_data = NULL;
 586         complete(waiting);
 587 }
 588
 589 static void mtip_null_completion(struct mtip_port *port,
 590                             int tag, struct mtip_cmd *command, int status)
 591 {
 592 }
 593
 594 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
 595                                 dma_addr_t buffer_dma, unsigned int sectors);
 596 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
 597                                                 struct smart_attr *attrib);
 598 /*
 599  * Handle an error.
 600  *
 601  * @dd Pointer to the DRIVER_DATA structure.
 602  *
 603  * return value
 604  *      None
 605  */
 606 static void mtip_handle_tfe(struct driver_data *dd)
 607 {
 608         int group, tag, bit, reissue, rv;
 609         struct mtip_port *port;
 610         struct mtip_cmd  *cmd;
 611         u32 completed;
 612         struct host_to_dev_fis *fis;
 613         unsigned long tagaccum[SLOTBITS_IN_LONGS];
 614         unsigned int cmd_cnt = 0;
 615         unsigned char *buf;
 616         char *fail_reason = NULL;
 617         int fail_all_ncq_write = 0, fail_all_ncq_cmds = 0;
 618
 619         dev_warn(&dd->pdev->dev, "Taskfile error\n");
 620
 621         port = dd->port;
 622
 623         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags)) {
 624                 cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 625                 dbg_printk(MTIP_DRV_NAME " TFE for the internal command\n");
 626
 627                 if (cmd->comp_data && cmd->comp_func) {
 628                         cmd->comp_func(port, MTIP_TAG_INTERNAL,
 629                                         cmd, PORT_IRQ_TF_ERR);
 630                 }
 631                 return;
 632         }
 633
 634         /* clear the tag accumulator */
 635         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 636
 637         /* Loop through all the groups */
 638         for (group = 0; group < dd->slot_groups; group++) {
 639                 completed = readl(port->completed[group]);
 640
 641                 dev_warn(&dd->pdev->dev, "g=%u, comp=%x\n", group, completed);
 642
 643                 /* clear completed status register in the hardware.*/
 644                 writel(completed, port->completed[group]);
 645
 646                 /* Process successfully completed commands */
 647                 for (bit = 0; bit < 32 && completed; bit++) {
 648                         if (!(completed & (1<<bit)))
 649                                 continue;
 650                         tag = (group << 5) + bit;
 651
 652                         /* Skip the internal command slot */
 653                         if (tag == MTIP_TAG_INTERNAL)
 654                                 continue;
 655
 656                         cmd = mtip_cmd_from_tag(dd, tag);
 657                         if (likely(cmd->comp_func)) {
 658                                 set_bit(tag, tagaccum);
 659                                 cmd_cnt++;
 660                                 cmd->comp_func(port, tag, cmd, 0);
 661                         } else {
 662                                 dev_err(&port->dd->pdev->dev,
 663                                         "Missing completion func for tag %d",
 664                                         tag);
 665                                 if (mtip_check_surprise_removal(dd->pdev)) {
 666                                         /* don't proceed further */
 667                                         return;
 668                                 }
 669                         }
 670                 }
 671         }
 672
 673         print_tags(dd, "completed (TFE)", tagaccum, cmd_cnt);
 674
 675         /* Restart the port */
 676         mdelay(20);
 677         mtip_restart_port(port);
 678
 679         /* Trying to determine the cause of the error */
 680         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
 681                                 dd->port->log_buf,
 682                                 dd->port->log_buf_dma, 1);
 683         if (rv) {
 684                 dev_warn(&dd->pdev->dev,
 685                         "Error in READ LOG EXT (10h) command\n");
 686                 /* non-critical error, don't fail the load */
 687         } else {
 688                 buf = (unsigned char *)dd->port->log_buf;
 689                 if (buf[259] & 0x1) {
 690                         dev_info(&dd->pdev->dev,
 691                                 "Write protect bit is set.\n");
 692                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
 693                         fail_all_ncq_write = 1;
 694                         fail_reason = "write protect";
 695                 }
 696                 if (buf[288] == 0xF7) {
 697                         dev_info(&dd->pdev->dev,
 698                                 "Exceeded Tmax, drive in thermal shutdown.\n");
 699                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
 700                         fail_all_ncq_cmds = 1;
 701                         fail_reason = "thermal shutdown";
 702                 }
 703                 if (buf[288] == 0xBF) {
 704                         set_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag);
 705                         dev_info(&dd->pdev->dev,
 706                                 "Drive indicates rebuild has failed. Secure erase required.\n");
 707                         fail_all_ncq_cmds = 1;
 708                         fail_reason = "rebuild failed";
 709                 }
 710         }
 711
 712         /* clear the tag accumulator */
 713         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 714
 715         /* Loop through all the groups */
 716         for (group = 0; group < dd->slot_groups; group++) {
 717                 for (bit = 0; bit < 32; bit++) {
 718                         reissue = 1;
 719                         tag = (group << 5) + bit;
 720                         cmd = mtip_cmd_from_tag(dd, tag);
 721
 722                         fis = (struct host_to_dev_fis *)cmd->command;
 723
 724                         /* Should re-issue? */
 725                         if (tag == MTIP_TAG_INTERNAL ||
 726                             fis->command == ATA_CMD_SET_FEATURES)
 727                                 reissue = 0;
 728                         else {
 729                                 if (fail_all_ncq_cmds ||
 730                                         (fail_all_ncq_write &&
 731                                         fis->command == ATA_CMD_FPDMA_WRITE)) {
 732                                         dev_warn(&dd->pdev->dev,
 733                                         "  Fail: %s w/tag %d [%s].\n",
 734                                         fis->command == ATA_CMD_FPDMA_WRITE ?
 735                                                 "write" : "read",
 736                                         tag,
 737                                         fail_reason != NULL ?
 738                                                 fail_reason : "unknown");
 739                                         if (cmd->comp_func) {
 740                                                 cmd->comp_func(port, tag,
 741                                                         cmd, -ENODATA);
 742                                         }
 743                                         continue;
 744                                 }
 745                         }
 746
 747                         /*
 748                          * First check if this command has
 749                          *  exceeded its retries.
 750                          */
 751                         if (reissue && (cmd->retries-- > 0)) {
 752
 753                                 set_bit(tag, tagaccum);
 754
 755                                 /* Re-issue the command. */
 756                                 mtip_issue_ncq_command(port, tag);
 757
 758                                 continue;
 759                         }
 760
 761                         /* Retire a command that will not be reissued */
 762                         dev_warn(&port->dd->pdev->dev,
 763                                 "retiring tag %d\n", tag);
 764
 765                         if (cmd->comp_func)
 766                                 cmd->comp_func(port, tag, cmd, PORT_IRQ_TF_ERR);
 767                         else
 768                                 dev_warn(&port->dd->pdev->dev,
 769                                         "Bad completion for tag %d\n",
 770                                         tag);
 771                 }
 772         }
 773         print_tags(dd, "reissued (TFE)", tagaccum, cmd_cnt);
 774 }
 775
 776 /*
 777  * Handle a set device bits interrupt
 778  */
 779 static inline void mtip_workq_sdbfx(struct mtip_port *port, int group,
 780                                                         u32 completed)
 781 {
 782         struct driver_data *dd = port->dd;
 783         int tag, bit;
 784         struct mtip_cmd *command;
 785
 786         if (!completed) {
 787                 WARN_ON_ONCE(!completed);
 788                 return;
 789         }
 790         /* clear completed status register in the hardware.*/
 791         writel(completed, port->completed[group]);
 792
 793         /* Process completed commands. */
 794         for (bit = 0; (bit < 32) && completed; bit++) {
 795                 if (completed & 0x01) {
 796                         tag = (group << 5) | bit;
 797
 798                         /* skip internal command slot. */
 799                         if (unlikely(tag == MTIP_TAG_INTERNAL))
 800                                 continue;
 801
 802                         command = mtip_cmd_from_tag(dd, tag);
 803                         if (likely(command->comp_func))
 804                                 command->comp_func(port, tag, command, 0);
 805                         else {
 806                                 dev_dbg(&dd->pdev->dev,
 807                                         "Null completion for tag %d",
 808                                         tag);
 809
 810                                 if (mtip_check_surprise_removal(
 811                                         dd->pdev)) {
 812                                         return;
 813                                 }
 814                         }
 815                 }
 816                 completed >>= 1;
 817         }
 818
 819         /* If last, re-enable interrupts */
 820         if (atomic_dec_return(&dd->irq_workers_active) == 0)
 821                 writel(0xffffffff, dd->mmio + HOST_IRQ_STAT);
 822 }
 823
 824 /*
 825  * Process legacy pio and d2h interrupts
 826  */
 827 static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat)
 828 {
 829         struct mtip_port *port = dd->port;
 830         struct mtip_cmd *cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 831
 832         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) &&
 833             (cmd != NULL) && !(readl(port->cmd_issue[MTIP_TAG_INTERNAL])
 834                 & (1 << MTIP_TAG_INTERNAL))) {
 835                 if (cmd->comp_func) {
 836                         cmd->comp_func(port, MTIP_TAG_INTERNAL, cmd, 0);
 837                         return;
 838                 }
 839         }
 840
 841         return;
 842 }
 843
 844 /*
 845  * Demux and handle errors
 846  */
 847 static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat)
 848 {
 849
 850         if (unlikely(port_stat & PORT_IRQ_CONNECT)) {
 851                 dev_warn(&dd->pdev->dev,
 852                         "Clearing PxSERR.DIAG.x\n");
 853                 writel((1 << 26), dd->port->mmio + PORT_SCR_ERR);
 854         }
 855
 856         if (unlikely(port_stat & PORT_IRQ_PHYRDY)) {
 857                 dev_warn(&dd->pdev->dev,
 858                         "Clearing PxSERR.DIAG.n\n");
 859                 writel((1 << 16), dd->port->mmio + PORT_SCR_ERR);
 860         }
 861
 862         if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) {
 863                 dev_warn(&dd->pdev->dev,
 864                         "Port stat errors %x unhandled\n",
 865                         (port_stat & ~PORT_IRQ_HANDLED));
 866                 if (mtip_check_surprise_removal(dd->pdev))
 867                         return;
 868         }
 869         if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR))) {
 870                 set_bit(MTIP_PF_EH_ACTIVE_BIT, &dd->port->flags);
 871                 wake_up_interruptible(&dd->port->svc_wait);
 872         }
 873 }
 874
 875 static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
 876 {
 877         struct driver_data *dd = (struct driver_data *) data;
 878         struct mtip_port *port = dd->port;
 879         u32 hba_stat, port_stat;
 880         int rv = IRQ_NONE;
 881         int do_irq_enable = 1, i, workers;
 882         struct mtip_work *twork;
 883
 884         hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
 885         if (hba_stat) {
 886                 rv = IRQ_HANDLED;
 887
 888                 /* Acknowledge the interrupt status on the port.*/
 889                 port_stat = readl(port->mmio + PORT_IRQ_STAT);
 890                 if (unlikely(port_stat == 0xFFFFFFFF)) {
 891                         mtip_check_surprise_removal(dd->pdev);
 892                         return IRQ_HANDLED;
 893                 }
 894                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
 895
 896                 /* Demux port status */
 897                 if (likely(port_stat & PORT_IRQ_SDB_FIS)) {
 898                         do_irq_enable = 0;
 899                         WARN_ON_ONCE(atomic_read(&dd->irq_workers_active) != 0);
 900
 901                         /* Start at 1: group zero is always local? */
 902                         for (i = 0, workers = 0; i < MTIP_MAX_SLOT_GROUPS;
 903                                                                         i++) {
 904                                 twork = &dd->work[i];
 905                                 twork->completed = readl(port->completed[i]);
 906                                 if (twork->completed)
 907                                         workers++;
 908                         }
 909
 910                         atomic_set(&dd->irq_workers_active, workers);
 911                         if (workers) {
 912                                 for (i = 1; i < MTIP_MAX_SLOT_GROUPS; i++) {
 913                                         twork = &dd->work[i];
 914                                         if (twork->completed)
 915                                                 queue_work_on(
 916                                                         twork->cpu_binding,
 917                                                         dd->isr_workq,
 918                                                         &twork->work);
 919                                 }
 920
 921                                 if (likely(dd->work[0].completed))
 922                                         mtip_workq_sdbfx(port, 0,
 923                                                         dd->work[0].completed);
 924
 925                         } else {
 926                                 /*
 927                                  * Chip quirk: SDB interrupt but nothing
 928                                  * to complete
 929                                  */
 930                                 do_irq_enable = 1;
 931                         }
 932                 }
 933
 934                 if (unlikely(port_stat & PORT_IRQ_ERR)) {
 935                         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
 936                                 /* don't proceed further */
 937                                 return IRQ_HANDLED;
 938                         }
 939                         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
 940                                                         &dd->dd_flag))
 941                                 return rv;
 942
 943                         mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
 944                 }
 945
 946                 if (unlikely(port_stat & PORT_IRQ_LEGACY))
 947                         mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY);
 948         }
 949
 950         /* acknowledge interrupt */
 951         if (unlikely(do_irq_enable))
 952                 writel(hba_stat, dd->mmio + HOST_IRQ_STAT);
 953
 954         return rv;
 955 }
 956
 957 /*
 958  * HBA interrupt subroutine.
 959  *
 960  * @irq         IRQ number.
 961  * @instance    Pointer to the driver data structure.
 962  *
 963  * return value
 964  *      IRQ_HANDLED     A HBA interrupt was pending and handled.
 965  *      IRQ_NONE        This interrupt was not for the HBA.
 966  */
 967 static irqreturn_t mtip_irq_handler(int irq, void *instance)
 968 {
 969         struct driver_data *dd = instance;
 970
 971         return mtip_handle_irq(dd);
 972 }
 973
 974 static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
 975 {
 976         writel(1 << MTIP_TAG_BIT(tag),
 977                 port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 978 }
 979
 980 static bool mtip_pause_ncq(struct mtip_port *port,
 981                                 struct host_to_dev_fis *fis)
 982 {
 983         struct host_to_dev_fis *reply;
 984         unsigned long task_file_data;
 985
 986         reply = port->rxfis + RX_FIS_D2H_REG;
 987         task_file_data = readl(port->mmio+PORT_TFDATA);
 988
 989         if ((task_file_data & 1))
 990                 return false;
 991
 992         if (fis->command == ATA_CMD_SEC_ERASE_PREP) {
 993                 port->ic_pause_timer = jiffies;
 994                 return true;
 995         } else if ((fis->command == ATA_CMD_DOWNLOAD_MICRO) &&
 996                                         (fis->features == 0x03)) {
 997                 set_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
 998                 port->ic_pause_timer = jiffies;
 999                 return true;
1000         } else if ((fis->command == ATA_CMD_SEC_ERASE_UNIT) ||
1001                 ((fis->command == 0xFC) &&
1002                         (fis->features == 0x27 || fis->features == 0x72 ||
1003                          fis->features == 0x62 || fis->features == 0x26))) {
1004                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1005                 clear_bit(MTIP_DDF_REBUILD_FAILED_BIT, &port->dd->dd_flag);
1006                 /* Com reset after secure erase or lowlevel format */
1007                 mtip_restart_port(port);
1008                 clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1009                 return false;
1010         }
1011
1012         return false;
1013 }
1014
1015 /*
1016  * Wait for port to quiesce
1017  *
1018  * @port    Pointer to port data structure
1019  * @timeout Max duration to wait (ms)
1020  * @atomic  gfp_t flag to indicate blockable context or not
1021  *
1022  * return value
1023  *      0       Success
1024  *      -EBUSY  Commands still active
1025  */
1026 static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout,
1027                                                                 gfp_t atomic)
1028 {
1029         unsigned long to;
1030         unsigned int n;
1031         unsigned int active = 1;
1032
1033         blk_mq_stop_hw_queues(port->dd->queue);
1034
1035         to = jiffies + msecs_to_jiffies(timeout);
1036         do {
1037                 if (test_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags) &&
1038                         test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags) &&
1039                         atomic == GFP_KERNEL) {
1040                         msleep(20);
1041                         continue; /* svc thd is actively issuing commands */
1042                 }
1043
1044                 if (atomic == GFP_KERNEL)
1045                         msleep(100);
1046                 else {
1047                         cpu_relax();
1048                         udelay(100);
1049                 }
1050
1051                 if (mtip_check_surprise_removal(port->dd->pdev))
1052                         goto err_fault;
1053
1054                 /*
1055                  * Ignore s_active bit 0 of array element 0.
1056                  * This bit will always be set
1057                  */
1058                 active = readl(port->s_active[0]) & 0xFFFFFFFE;
1059                 for (n = 1; n < port->dd->slot_groups; n++)
1060                         active |= readl(port->s_active[n]);
1061
1062                 if (!active)
1063                         break;
1064         } while (time_before(jiffies, to));
1065
1066         blk_mq_start_stopped_hw_queues(port->dd->queue, true);
1067         return active ? -EBUSY : 0;
1068 err_fault:
1069         blk_mq_start_stopped_hw_queues(port->dd->queue, true);
1070         return -EFAULT;
1071 }
1072
1073 /*
1074  * Execute an internal command and wait for the completion.
1075  *
1076  * @port    Pointer to the port data structure.
1077  * @fis     Pointer to the FIS that describes the command.
1078  * @fis_len  Length in WORDS of the FIS.
1079  * @buffer  DMA accessible for command data.
1080  * @buf_len  Length, in bytes, of the data buffer.
1081  * @opts    Command header options, excluding the FIS length
1082  *             and the number of PRD entries.
1083  * @timeout Time in ms to wait for the command to complete.
1084  *
1085  * return value
1086  *      0        Command completed successfully.
1087  *      -EFAULT  The buffer address is not correctly aligned.
1088  *      -EBUSY   Internal command or other IO in progress.
1089  *      -EAGAIN  Time out waiting for command to complete.
1090  */
1091 static int mtip_exec_internal_command(struct mtip_port *port,
1092                                         struct host_to_dev_fis *fis,
1093                                         int fis_len,
1094                                         dma_addr_t buffer,
1095                                         int buf_len,
1096                                         u32 opts,
1097                                         gfp_t atomic,
1098                                         unsigned long timeout)
1099 {
1100         struct mtip_cmd_sg *command_sg;
1101         DECLARE_COMPLETION_ONSTACK(wait);
1102         struct mtip_cmd *int_cmd;
1103         struct driver_data *dd = port->dd;
1104         int rv = 0;
1105         unsigned long start;
1106
1107         /* Make sure the buffer is 8 byte aligned. This is asic specific. */
1108         if (buffer & 0x00000007) {
1109                 dev_err(&dd->pdev->dev, "SG buffer is not 8 byte aligned\n");
1110                 return -EFAULT;
1111         }
1112
1113         int_cmd = mtip_get_int_command(dd);
1114         if (!int_cmd) {
1115                 dbg_printk(MTIP_DRV_NAME "Unable to allocate tag for PIO cmd\n");
1116                 return -EFAULT;
1117         }
1118
1119         set_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1120
1121         if (fis->command == ATA_CMD_SEC_ERASE_PREP)
1122                 set_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1123
1124         clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1125
1126         if (atomic == GFP_KERNEL) {
1127                 if (fis->command != ATA_CMD_STANDBYNOW1) {
1128                         /* wait for io to complete if non atomic */
1129                         if (mtip_quiesce_io(port,
1130                                 MTIP_QUIESCE_IO_TIMEOUT_MS, atomic) < 0) {
1131                                 dev_warn(&dd->pdev->dev,
1132                                         "Failed to quiesce IO\n");
1133                                 mtip_put_int_command(dd, int_cmd);
1134                                 clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1135                                 wake_up_interruptible(&port->svc_wait);
1136                                 return -EBUSY;
1137                         }
1138                 }
1139
1140                 /* Set the completion function and data for the command. */
1141                 int_cmd->comp_data = &wait;
1142                 int_cmd->comp_func = mtip_completion;
1143
1144         } else {
1145                 /* Clear completion - we're going to poll */
1146                 int_cmd->comp_data = NULL;
1147                 int_cmd->comp_func = mtip_null_completion;
1148         }
1149
1150         /* Copy the command to the command table */
1151         memcpy(int_cmd->command, fis, fis_len*4);
1152
1153         /* Populate the SG list */
1154         int_cmd->command_header->opts =
1155                  __force_bit2int cpu_to_le32(opts | fis_len);
1156         if (buf_len) {
1157                 command_sg = int_cmd->command + AHCI_CMD_TBL_HDR_SZ;
1158
1159                 command_sg->info =
1160                         __force_bit2int cpu_to_le32((buf_len-1) & 0x3FFFFF);
1161                 command_sg->dba =
1162                         __force_bit2int cpu_to_le32(buffer & 0xFFFFFFFF);
1163                 command_sg->dba_upper =
1164                         __force_bit2int cpu_to_le32((buffer >> 16) >> 16);
1165
1166                 int_cmd->command_header->opts |=
1167                         __force_bit2int cpu_to_le32((1 << 16));
1168         }
1169
1170         /* Populate the command header */
1171         int_cmd->command_header->byte_count = 0;
1172
1173         start = jiffies;
1174
1175         /* Issue the command to the hardware */
1176         mtip_issue_non_ncq_command(port, MTIP_TAG_INTERNAL);
1177
1178         if (atomic == GFP_KERNEL) {
1179                 /* Wait for the command to complete or timeout. */
1180                 if ((rv = wait_for_completion_interruptible_timeout(
1181                                 &wait,
1182                                 msecs_to_jiffies(timeout))) <= 0) {
1183
1184                         if (rv == -ERESTARTSYS) { /* interrupted */
1185                                 dev_err(&dd->pdev->dev,
1186                                         "Internal command [%02X] was interrupted after %u ms\n",
1187                                         fis->command,
1188                                         jiffies_to_msecs(jiffies - start));
1189                                 rv = -EINTR;
1190                                 goto exec_ic_exit;
1191                         } else if (rv == 0) /* timeout */
1192                                 dev_err(&dd->pdev->dev,
1193                                         "Internal command did not complete [%02X] within timeout of  %lu ms\n",
1194                                         fis->command, timeout);
1195                         else
1196                                 dev_err(&dd->pdev->dev,
1197                                         "Internal command [%02X] wait returned code [%d] after %lu ms - unhandled\n",
1198                                         fis->command, rv, timeout);
1199
1200                         if (mtip_check_surprise_removal(dd->pdev) ||
1201                                 test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1202                                                 &dd->dd_flag)) {
1203                                 dev_err(&dd->pdev->dev,
1204                                         "Internal command [%02X] wait returned due to SR\n",
1205                                         fis->command);
1206                                 rv = -ENXIO;
1207                                 goto exec_ic_exit;
1208                         }
1209                         mtip_device_reset(dd); /* recover from timeout issue */
1210                         rv = -EAGAIN;
1211                         goto exec_ic_exit;
1212                 }
1213         } else {
1214                 u32 hba_stat, port_stat;
1215
1216                 /* Spin for <timeout> checking if command still outstanding */
1217                 timeout = jiffies + msecs_to_jiffies(timeout);
1218                 while ((readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1219                                 & (1 << MTIP_TAG_INTERNAL))
1220                                 && time_before(jiffies, timeout)) {
1221                         if (mtip_check_surprise_removal(dd->pdev)) {
1222                                 rv = -ENXIO;
1223                                 goto exec_ic_exit;
1224                         }
1225                         if ((fis->command != ATA_CMD_STANDBYNOW1) &&
1226                                 test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1227                                                 &dd->dd_flag)) {
1228                                 rv = -ENXIO;
1229                                 goto exec_ic_exit;
1230                         }
1231                         port_stat = readl(port->mmio + PORT_IRQ_STAT);
1232                         if (!port_stat)
1233                                 continue;
1234
1235                         if (port_stat & PORT_IRQ_ERR) {
1236                                 dev_err(&dd->pdev->dev,
1237                                         "Internal command [%02X] failed\n",
1238                                         fis->command);
1239                                 mtip_device_reset(dd);
1240                                 rv = -EIO;
1241                                 goto exec_ic_exit;
1242                         } else {
1243                                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
1244                                 hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
1245                                 if (hba_stat)
1246                                         writel(hba_stat,
1247                                                 dd->mmio + HOST_IRQ_STAT);
1248                         }
1249                         break;
1250                 }
1251         }
1252
1253         if (readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1254                         & (1 << MTIP_TAG_INTERNAL)) {
1255                 rv = -ENXIO;
1256                 if (!test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
1257                         mtip_device_reset(dd);
1258                         rv = -EAGAIN;
1259                 }
1260         }
1261 exec_ic_exit:
1262         /* Clear the allocated and active bits for the internal command. */
1263         mtip_put_int_command(dd, int_cmd);
1264         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1265         if (rv >= 0 && mtip_pause_ncq(port, fis)) {
1266                 /* NCQ paused */
1267                 return rv;
1268         }
1269         wake_up_interruptible(&port->svc_wait);
1270
1271         return rv;
1272 }
1273
1274 /*
1275  * Byte-swap ATA ID strings.
1276  *
1277  * ATA identify data contains strings in byte-swapped 16-bit words.
1278  * They must be swapped (on all architectures) to be usable as C strings.
1279  * This function swaps bytes in-place.
1280  *
1281  * @buf The buffer location of the string
1282  * @len The number of bytes to swap
1283  *
1284  * return value
1285  *      None
1286  */
1287 static inline void ata_swap_string(u16 *buf, unsigned int len)
1288 {
1289         int i;
1290         for (i = 0; i < (len/2); i++)
1291                 be16_to_cpus(&buf[i]);
1292 }
1293
1294 static void mtip_set_timeout(struct driver_data *dd,
1295                                         struct host_to_dev_fis *fis,
1296                                         unsigned int *timeout, u8 erasemode)
1297 {
1298         switch (fis->command) {
1299         case ATA_CMD_DOWNLOAD_MICRO:
1300                 *timeout = 120000; /* 2 minutes */
1301                 break;
1302         case ATA_CMD_SEC_ERASE_UNIT:
1303         case 0xFC:
1304                 if (erasemode)
1305                         *timeout = ((*(dd->port->identify + 90) * 2) * 60000);
1306                 else
1307                         *timeout = ((*(dd->port->identify + 89) * 2) * 60000);
1308                 break;
1309         case ATA_CMD_STANDBYNOW1:
1310                 *timeout = 120000;  /* 2 minutes */
1311                 break;
1312         case 0xF7:
1313         case 0xFA:
1314                 *timeout = 60000;  /* 60 seconds */
1315                 break;
1316         case ATA_CMD_SMART:
1317                 *timeout = 15000;  /* 15 seconds */
1318                 break;
1319         default:
1320                 *timeout = MTIP_IOCTL_CMD_TIMEOUT_MS;
1321                 break;
1322         }
1323 }
1324
1325 /*
1326  * Request the device identity information.
1327  *
1328  * If a user space buffer is not specified, i.e. is NULL, the
1329  * identify information is still read from the drive and placed
1330  * into the identify data buffer (@e port->identify) in the
1331  * port data structure.
1332  * When the identify buffer contains valid identify information @e
1333  * port->identify_valid is non-zero.
1334  *
1335  * @port         Pointer to the port structure.
1336  * @user_buffer  A user space buffer where the identify data should be
1337  *                    copied.
1338  *
1339  * return value
1340  *      0       Command completed successfully.
1341  *      -EFAULT An error occurred while coping data to the user buffer.
1342  *      -1      Command failed.
1343  */
1344 static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
1345 {
1346         int rv = 0;
1347         struct host_to_dev_fis fis;
1348
1349         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1350                 return -EFAULT;
1351
1352         /* Build the FIS. */
1353         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1354         fis.type        = 0x27;
1355         fis.opts        = 1 << 7;
1356         fis.command     = ATA_CMD_ID_ATA;
1357
1358         /* Set the identify information as invalid. */
1359         port->identify_valid = 0;
1360
1361         /* Clear the identify information. */
1362         memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);
1363
1364         /* Execute the command. */
1365         if (mtip_exec_internal_command(port,
1366                                 &fis,
1367                                 5,
1368                                 port->identify_dma,
1369                                 sizeof(u16) * ATA_ID_WORDS,
1370                                 0,
1371                                 GFP_KERNEL,
1372                                 MTIP_INT_CMD_TIMEOUT_MS)
1373                                 < 0) {
1374                 rv = -1;
1375                 goto out;
1376         }
1377
1378         /*
1379          * Perform any necessary byte-swapping.  Yes, the kernel does in fact
1380          * perform field-sensitive swapping on the string fields.
1381          * See the kernel use of ata_id_string() for proof of this.
1382          */
1383 #ifdef __LITTLE_ENDIAN
1384         ata_swap_string(port->identify + 27, 40);  /* model string*/
1385         ata_swap_string(port->identify + 23, 8);   /* firmware string*/
1386         ata_swap_string(port->identify + 10, 20);  /* serial# string*/
1387 #else
1388         {
1389                 int i;
1390                 for (i = 0; i < ATA_ID_WORDS; i++)
1391                         port->identify[i] = le16_to_cpu(port->identify[i]);
1392         }
1393 #endif
1394
1395         /* Check security locked state */
1396         if (port->identify[128] & 0x4)
1397                 set_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1398         else
1399                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1400
1401 #ifdef MTIP_TRIM /* Disabling TRIM support temporarily */
1402         /* Demux ID.DRAT & ID.RZAT to determine trim support */
1403         if (port->identify[69] & (1 << 14) && port->identify[69] & (1 << 5))
1404                 port->dd->trim_supp = true;
1405         else
1406 #endif
1407                 port->dd->trim_supp = false;
1408
1409         /* Set the identify buffer as valid. */
1410         port->identify_valid = 1;
1411
1412         if (user_buffer) {
1413                 if (copy_to_user(
1414                         user_buffer,
1415                         port->identify,
1416                         ATA_ID_WORDS * sizeof(u16))) {
1417                         rv = -EFAULT;
1418                         goto out;
1419                 }
1420         }
1421
1422 out:
1423         return rv;
1424 }
1425
1426 /*
1427  * Issue a standby immediate command to the device.
1428  *
1429  * @port Pointer to the port structure.
1430  *
1431  * return value
1432  *      0       Command was executed successfully.
1433  *      -1      An error occurred while executing the command.
1434  */
1435 static int mtip_standby_immediate(struct mtip_port *port)
1436 {
1437         int rv;
1438         struct host_to_dev_fis  fis;
1439         unsigned long start;
1440         unsigned int timeout;
1441
1442         /* Build the FIS. */
1443         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1444         fis.type        = 0x27;
1445         fis.opts        = 1 << 7;
1446         fis.command     = ATA_CMD_STANDBYNOW1;
1447
1448         mtip_set_timeout(port->dd, &fis, &timeout, 0);
1449
1450         start = jiffies;
1451         rv = mtip_exec_internal_command(port,
1452                                         &fis,
1453                                         5,
1454                                         0,
1455                                         0,
1456                                         0,
1457                                         GFP_ATOMIC,
1458                                         timeout);
1459         dbg_printk(MTIP_DRV_NAME "Time taken to complete standby cmd: %d ms\n",
1460                         jiffies_to_msecs(jiffies - start));
1461         if (rv)
1462                 dev_warn(&port->dd->pdev->dev,
1463                         "STANDBY IMMEDIATE command failed.\n");
1464
1465         return rv;
1466 }
1467
1468 /*
1469  * Issue a READ LOG EXT command to the device.
1470  *
1471  * @port        pointer to the port structure.
1472  * @page        page number to fetch
1473  * @buffer      pointer to buffer
1474  * @buffer_dma  dma address corresponding to @buffer
1475  * @sectors     page length to fetch, in sectors
1476  *
1477  * return value
1478  *      @rv     return value from mtip_exec_internal_command()
1479  */
1480 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
1481                                 dma_addr_t buffer_dma, unsigned int sectors)
1482 {
1483         struct host_to_dev_fis fis;
1484
1485         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1486         fis.type        = 0x27;
1487         fis.opts        = 1 << 7;
1488         fis.command     = ATA_CMD_READ_LOG_EXT;
1489         fis.sect_count  = sectors & 0xFF;
1490         fis.sect_cnt_ex = (sectors >> 8) & 0xFF;
1491         fis.lba_low     = page;
1492         fis.lba_mid     = 0;
1493         fis.device      = ATA_DEVICE_OBS;
1494
1495         memset(buffer, 0, sectors * ATA_SECT_SIZE);
1496
1497         return mtip_exec_internal_command(port,
1498                                         &fis,
1499                                         5,
1500                                         buffer_dma,
1501                                         sectors * ATA_SECT_SIZE,
1502                                         0,
1503                                         GFP_ATOMIC,
1504                                         MTIP_INT_CMD_TIMEOUT_MS);
1505 }
1506
1507 /*
1508  * Issue a SMART READ DATA command to the device.
1509  *
1510  * @port        pointer to the port structure.
1511  * @buffer      pointer to buffer
1512  * @buffer_dma  dma address corresponding to @buffer
1513  *
1514  * return value
1515  *      @rv     return value from mtip_exec_internal_command()
1516  */
1517 static int mtip_get_smart_data(struct mtip_port *port, u8 *buffer,
1518                                         dma_addr_t buffer_dma)
1519 {
1520         struct host_to_dev_fis fis;
1521
1522         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1523         fis.type        = 0x27;
1524         fis.opts        = 1 << 7;
1525         fis.command     = ATA_CMD_SMART;
1526         fis.features    = 0xD0;
1527         fis.sect_count  = 1;
1528         fis.lba_mid     = 0x4F;
1529         fis.lba_hi      = 0xC2;
1530         fis.device      = ATA_DEVICE_OBS;
1531
1532         return mtip_exec_internal_command(port,
1533                                         &fis,
1534                                         5,
1535                                         buffer_dma,
1536                                         ATA_SECT_SIZE,
1537                                         0,
1538                                         GFP_ATOMIC,
1539                                         15000);
1540 }
1541
1542 /*
1543  * Get the value of a smart attribute
1544  *
1545  * @port        pointer to the port structure
1546  * @id          attribute number
1547  * @attrib      pointer to return attrib information corresponding to @id
1548  *
1549  * return value
1550  *      -EINVAL NULL buffer passed or unsupported attribute @id.
1551  *      -EPERM  Identify data not valid, SMART not supported or not enabled
1552  */
1553 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
1554                                                 struct smart_attr *attrib)
1555 {
1556         int rv, i;
1557         struct smart_attr *pattr;
1558
1559         if (!attrib)
1560                 return -EINVAL;
1561
1562         if (!port->identify_valid) {
1563                 dev_warn(&port->dd->pdev->dev, "IDENTIFY DATA not valid\n");
1564                 return -EPERM;
1565         }
1566         if (!(port->identify[82] & 0x1)) {
1567                 dev_warn(&port->dd->pdev->dev, "SMART not supported\n");
1568                 return -EPERM;
1569         }
1570         if (!(port->identify[85] & 0x1)) {
1571                 dev_warn(&port->dd->pdev->dev, "SMART not enabled\n");
1572                 return -EPERM;
1573         }
1574
1575         memset(port->smart_buf, 0, ATA_SECT_SIZE);
1576         rv = mtip_get_smart_data(port, port->smart_buf, port->smart_buf_dma);
1577         if (rv) {
1578                 dev_warn(&port->dd->pdev->dev, "Failed to ge SMART data\n");
1579                 return rv;
1580         }
1581
1582         pattr = (struct smart_attr *)(port->smart_buf + 2);
1583         for (i = 0; i < 29; i++, pattr++)
1584                 if (pattr->attr_id == id) {
1585                         memcpy(attrib, pattr, sizeof(struct smart_attr));
1586                         break;
1587                 }
1588
1589         if (i == 29) {
1590                 dev_warn(&port->dd->pdev->dev,
1591                         "Query for invalid SMART attribute ID\n");
1592                 rv = -EINVAL;
1593         }
1594
1595         return rv;
1596 }
1597
1598 /*
1599  * Trim unused sectors
1600  *
1601  * @dd          pointer to driver_data structure
1602  * @lba         starting lba
1603  * @len         # of 512b sectors to trim
1604  *
1605  * return value
1606  *      -ENOMEM         Out of dma memory
1607  *      -EINVAL         Invalid parameters passed in, trim not supported
1608  *      -EIO            Error submitting trim request to hw
1609  */
1610 static int mtip_send_trim(struct driver_data *dd, unsigned int lba,
1611                                 unsigned int len)
1612 {
1613         int i, rv = 0;
1614         u64 tlba, tlen, sect_left;
1615         struct mtip_trim_entry *buf;
1616         dma_addr_t dma_addr;
1617         struct host_to_dev_fis fis;
1618
1619         if (!len || dd->trim_supp == false)
1620                 return -EINVAL;
1621
1622         /* Trim request too big */
1623         WARN_ON(len > (MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES));
1624
1625         /* Trim request not aligned on 4k boundary */
1626         WARN_ON(len % 8 != 0);
1627
1628         /* Warn if vu_trim structure is too big */
1629         WARN_ON(sizeof(struct mtip_trim) > ATA_SECT_SIZE);
1630
1631         /* Allocate a DMA buffer for the trim structure */
1632         buf = dmam_alloc_coherent(&dd->pdev->dev, ATA_SECT_SIZE, &dma_addr,
1633                                                                 GFP_KERNEL);
1634         if (!buf)
1635                 return -ENOMEM;
1636         memset(buf, 0, ATA_SECT_SIZE);
1637
1638         for (i = 0, sect_left = len, tlba = lba;
1639                         i < MTIP_MAX_TRIM_ENTRIES && sect_left;
1640                         i++) {
1641                 tlen = (sect_left >= MTIP_MAX_TRIM_ENTRY_LEN ?
1642                                         MTIP_MAX_TRIM_ENTRY_LEN :
1643                                         sect_left);
1644                 buf[i].lba = __force_bit2int cpu_to_le32(tlba);
1645                 buf[i].range = __force_bit2int cpu_to_le16(tlen);
1646                 tlba += tlen;
1647                 sect_left -= tlen;
1648         }
1649         WARN_ON(sect_left != 0);
1650
1651         /* Build the fis */
1652         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1653         fis.type       = 0x27;
1654         fis.opts       = 1 << 7;
1655         fis.command    = 0xfb;
1656         fis.features   = 0x60;
1657         fis.sect_count = 1;
1658         fis.device     = ATA_DEVICE_OBS;
1659
1660         if (mtip_exec_internal_command(dd->port,
1661                                         &fis,
1662                                         5,
1663                                         dma_addr,
1664                                         ATA_SECT_SIZE,
1665                                         0,
1666                                         GFP_KERNEL,
1667                                         MTIP_TRIM_TIMEOUT_MS) < 0)
1668                 rv = -EIO;
1669
1670         dmam_free_coherent(&dd->pdev->dev, ATA_SECT_SIZE, buf, dma_addr);
1671         return rv;
1672 }
1673
1674 /*
1675  * Get the drive capacity.
1676  *
1677  * @dd      Pointer to the device data structure.
1678  * @sectors Pointer to the variable that will receive the sector count.
1679  *
1680  * return value
1681  *      1 Capacity was returned successfully.
1682  *      0 The identify information is invalid.
1683  */
1684 static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
1685 {
1686         struct mtip_port *port = dd->port;
1687         u64 total, raw0, raw1, raw2, raw3;
1688         raw0 = port->identify[100];
1689         raw1 = port->identify[101];
1690         raw2 = port->identify[102];
1691         raw3 = port->identify[103];
1692         total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
1693         *sectors = total;
1694         return (bool) !!port->identify_valid;
1695 }
1696
1697 /*
1698  * Display the identify command data.
1699  *
1700  * @port Pointer to the port data structure.
1701  *
1702  * return value
1703  *      None
1704  */
1705 static void mtip_dump_identify(struct mtip_port *port)
1706 {
1707         sector_t sectors;
1708         unsigned short revid;
1709         char cbuf[42];
1710
1711         if (!port->identify_valid)
1712                 return;
1713
1714         strlcpy(cbuf, (char *)(port->identify+10), 21);
1715         dev_info(&port->dd->pdev->dev,
1716                 "Serial No.: %s\n", cbuf);
1717
1718         strlcpy(cbuf, (char *)(port->identify+23), 9);
1719         dev_info(&port->dd->pdev->dev,
1720                 "Firmware Ver.: %s\n", cbuf);
1721
1722         strlcpy(cbuf, (char *)(port->identify+27), 41);
1723         dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);
1724
1725         dev_info(&port->dd->pdev->dev, "Security: %04x %s\n",
1726                 port->identify[128],
1727                 port->identify[128] & 0x4 ? "(LOCKED)" : "");
1728
1729         if (mtip_hw_get_capacity(port->dd, &sectors))
1730                 dev_info(&port->dd->pdev->dev,
1731                         "Capacity: %llu sectors (%llu MB)\n",
1732                          (u64)sectors,
1733                          ((u64)sectors) * ATA_SECT_SIZE >> 20);
1734
1735         pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
1736         switch (revid & 0xFF) {
1737         case 0x1:
1738                 strlcpy(cbuf, "A0", 3);
1739                 break;
1740         case 0x3:
1741                 strlcpy(cbuf, "A2", 3);
1742                 break;
1743         default:
1744                 strlcpy(cbuf, "?", 2);
1745                 break;
1746         }
1747         dev_info(&port->dd->pdev->dev,
1748                 "Card Type: %s\n", cbuf);
1749 }
1750
1751 /*
1752  * Map the commands scatter list into the command table.
1753  *
1754  * @command Pointer to the command.
1755  * @nents Number of scatter list entries.
1756  *
1757  * return value
1758  *      None
1759  */
1760 static inline void fill_command_sg(struct driver_data *dd,
1761                                 struct mtip_cmd *command,
1762                                 int nents)
1763 {
1764         int n;
1765         unsigned int dma_len;
1766         struct mtip_cmd_sg *command_sg;
1767         struct scatterlist *sg = command->sg;
1768
1769         command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
1770
1771         for (n = 0; n < nents; n++) {
1772                 dma_len = sg_dma_len(sg);
1773                 if (dma_len > 0x400000)
1774                         dev_err(&dd->pdev->dev,
1775                                 "DMA segment length truncated\n");
1776                 command_sg->info = __force_bit2int
1777                         cpu_to_le32((dma_len-1) & 0x3FFFFF);
1778                 command_sg->dba = __force_bit2int
1779                         cpu_to_le32(sg_dma_address(sg));
1780                 command_sg->dba_upper = __force_bit2int
1781                         cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
1782                 command_sg++;
1783                 sg++;
1784         }
1785 }
1786
1787 /*
1788  * @brief Execute a drive command.
1789  *
1790  * return value 0 The command completed successfully.
1791  * return value -1 An error occurred while executing the command.
1792  */
1793 static int exec_drive_task(struct mtip_port *port, u8 *command)
1794 {
1795         struct host_to_dev_fis  fis;
1796         struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
1797         unsigned int to;
1798
1799         /* Build the FIS. */
1800         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1801         fis.type        = 0x27;
1802         fis.opts        = 1 << 7;
1803         fis.command     = command[0];
1804         fis.features    = command[1];
1805         fis.sect_count  = command[2];
1806         fis.sector      = command[3];
1807         fis.cyl_low     = command[4];
1808         fis.cyl_hi      = command[5];
1809         fis.device      = command[6] & ~0x10; /* Clear the dev bit*/
1810
1811         mtip_set_timeout(port->dd, &fis, &to, 0);
1812
1813         dbg_printk(MTIP_DRV_NAME " %s: User Command: cmd %x, feat %x, nsect %x, sect %x, lcyl %x, hcyl %x, sel %x\n",
1814                 __func__,
1815                 command[0],
1816                 command[1],
1817                 command[2],
1818                 command[3],
1819                 command[4],
1820                 command[5],
1821                 command[6]);
1822
1823         /* Execute the command. */
1824         if (mtip_exec_internal_command(port,
1825                                  &fis,
1826                                  5,
1827                                  0,
1828                                  0,
1829                                  0,
1830                                  GFP_KERNEL,
1831                                  to) < 0) {
1832                 return -1;
1833         }
1834
1835         command[0] = reply->command; /* Status*/
1836         command[1] = reply->features; /* Error*/
1837         command[4] = reply->cyl_low;
1838         command[5] = reply->cyl_hi;
1839
1840         dbg_printk(MTIP_DRV_NAME " %s: Completion Status: stat %x, err %x , cyl_lo %x cyl_hi %x\n",
1841                 __func__,
1842                 command[0],
1843                 command[1],
1844                 command[4],
1845                 command[5]);
1846
1847         return 0;
1848 }
1849
1850 /*
1851  * @brief Execute a drive command.
1852  *
1853  * @param port Pointer to the port data structure.
1854  * @param command Pointer to the user specified command parameters.
1855  * @param user_buffer Pointer to the user space buffer where read sector
1856  *                   data should be copied.
1857  *
1858  * return value 0 The command completed successfully.
1859  * return value -EFAULT An error occurred while copying the completion
1860  *                 data to the user space buffer.
1861  * return value -1 An error occurred while executing the command.
1862  */
1863 static int exec_drive_command(struct mtip_port *port, u8 *command,
1864                                 void __user *user_buffer)
1865 {
1866         struct host_to_dev_fis  fis;
1867         struct host_to_dev_fis *reply;
1868         u8 *buf = NULL;
1869         dma_addr_t dma_addr = 0;
1870         int rv = 0, xfer_sz = command[3];
1871         unsigned int to;
1872
1873         if (xfer_sz) {
1874                 if (!user_buffer)
1875                         return -EFAULT;
1876
1877                 buf = dmam_alloc_coherent(&port->dd->pdev->dev,
1878                                 ATA_SECT_SIZE * xfer_sz,
1879                                 &dma_addr,
1880                                 GFP_KERNEL);
1881                 if (!buf) {
1882                         dev_err(&port->dd->pdev->dev,
1883                                 "Memory allocation failed (%d bytes)\n",
1884                                 ATA_SECT_SIZE * xfer_sz);
1885                         return -ENOMEM;
1886                 }
1887                 memset(buf, 0, ATA_SECT_SIZE * xfer_sz);
1888         }
1889
1890         /* Build the FIS. */
1891         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1892         fis.type        = 0x27;
1893         fis.opts        = 1 << 7;
1894         fis.command     = command[0];
1895         fis.features    = command[2];
1896         fis.sect_count  = command[3];
1897         if (fis.command == ATA_CMD_SMART) {
1898                 fis.sector      = command[1];
1899                 fis.cyl_low     = 0x4F;
1900                 fis.cyl_hi      = 0xC2;
1901         }
1902
1903         mtip_set_timeout(port->dd, &fis, &to, 0);
1904
1905         if (xfer_sz)
1906                 reply = (port->rxfis + RX_FIS_PIO_SETUP);
1907         else
1908                 reply = (port->rxfis + RX_FIS_D2H_REG);
1909
1910         dbg_printk(MTIP_DRV_NAME
1911                 " %s: User Command: cmd %x, sect %x, "
1912                 "feat %x, sectcnt %x\n",
1913                 __func__,
1914                 command[0],
1915                 command[1],
1916                 command[2],
1917                 command[3]);
1918
1919         /* Execute the command. */
1920         if (mtip_exec_internal_command(port,
1921                                 &fis,
1922                                  5,
1923                                  (xfer_sz ? dma_addr : 0),
1924                                  (xfer_sz ? ATA_SECT_SIZE * xfer_sz : 0),
1925                                  0,
1926                                  GFP_KERNEL,
1927                                  to)
1928                                  < 0) {
1929                 rv = -EFAULT;
1930                 goto exit_drive_command;
1931         }
1932
1933         /* Collect the completion status. */
1934         command[0] = reply->command; /* Status*/
1935         command[1] = reply->features; /* Error*/
1936         command[2] = reply->sect_count;
1937
1938         dbg_printk(MTIP_DRV_NAME
1939                 " %s: Completion Status: stat %x, "
1940                 "err %x, nsect %x\n",
1941                 __func__,
1942                 command[0],
1943                 command[1],
1944                 command[2]);
1945
1946         if (xfer_sz) {
1947                 if (copy_to_user(user_buffer,
1948                                  buf,
1949                                  ATA_SECT_SIZE * command[3])) {
1950                         rv = -EFAULT;
1951                         goto exit_drive_command;
1952                 }
1953         }
1954 exit_drive_command:
1955         if (buf)
1956                 dmam_free_coherent(&port->dd->pdev->dev,
1957                                 ATA_SECT_SIZE * xfer_sz, buf, dma_addr);
1958         return rv;
1959 }
1960
1961 /*
1962  *  Indicates whether a command has a single sector payload.
1963  *
1964  *  @command passed to the device to perform the certain event.
1965  *  @features passed to the device to perform the certain event.
1966  *
1967  *  return value
1968  *      1       command is one that always has a single sector payload,
1969  *              regardless of the value in the Sector Count field.
1970  *      0       otherwise
1971  *
1972  */
1973 static unsigned int implicit_sector(unsigned char command,
1974                                     unsigned char features)
1975 {
1976         unsigned int rv = 0;
1977
1978         /* list of commands that have an implicit sector count of 1 */
1979         switch (command) {
1980         case ATA_CMD_SEC_SET_PASS:
1981         case ATA_CMD_SEC_UNLOCK:
1982         case ATA_CMD_SEC_ERASE_PREP:
1983         case ATA_CMD_SEC_ERASE_UNIT:
1984         case ATA_CMD_SEC_FREEZE_LOCK:
1985         case ATA_CMD_SEC_DISABLE_PASS:
1986         case ATA_CMD_PMP_READ:
1987         case ATA_CMD_PMP_WRITE:
1988                 rv = 1;
1989                 break;
1990         case ATA_CMD_SET_MAX:
1991                 if (features == ATA_SET_MAX_UNLOCK)
1992                         rv = 1;
1993                 break;
1994         case ATA_CMD_SMART:
1995                 if ((features == ATA_SMART_READ_VALUES) ||
1996                                 (features == ATA_SMART_READ_THRESHOLDS))
1997                         rv = 1;
1998                 break;
1999         case ATA_CMD_CONF_OVERLAY:
2000                 if ((features == ATA_DCO_IDENTIFY) ||
2001                                 (features == ATA_DCO_SET))
2002                         rv = 1;
2003                 break;
2004         }
2005         return rv;
2006 }
2007
2008 /*
2009  * Executes a taskfile
2010  * See ide_taskfile_ioctl() for derivation
2011  */
2012 static int exec_drive_taskfile(struct driver_data *dd,
2013                                void __user *buf,
2014                                ide_task_request_t *req_task,
2015                                int outtotal)
2016 {
2017         struct host_to_dev_fis  fis;
2018         struct host_to_dev_fis *reply;
2019         u8 *outbuf = NULL;
2020         u8 *inbuf = NULL;
2021         dma_addr_t outbuf_dma = 0;
2022         dma_addr_t inbuf_dma = 0;
2023         dma_addr_t dma_buffer = 0;
2024         int err = 0;
2025         unsigned int taskin = 0;
2026         unsigned int taskout = 0;
2027         u8 nsect = 0;
2028         unsigned int timeout;
2029         unsigned int force_single_sector;
2030         unsigned int transfer_size;
2031         unsigned long task_file_data;
2032         int intotal = outtotal + req_task->out_size;
2033         int erasemode = 0;
2034
2035         taskout = req_task->out_size;
2036         taskin = req_task->in_size;
2037         /* 130560 = 512 * 0xFF*/
2038         if (taskin > 130560 || taskout > 130560) {
2039                 err = -EINVAL;
2040                 goto abort;
2041         }
2042
2043         if (taskout) {
2044                 outbuf = memdup_user(buf + outtotal, taskout);
2045                 if (IS_ERR(outbuf)) {
2046                         err = PTR_ERR(outbuf);
2047                         outbuf = NULL;
2048                         goto abort;
2049                 }
2050                 outbuf_dma = pci_map_single(dd->pdev,
2051                                          outbuf,
2052                                          taskout,
2053                                          DMA_TO_DEVICE);
2054                 if (pci_dma_mapping_error(dd->pdev, outbuf_dma)) {
2055                         err = -ENOMEM;
2056                         goto abort;
2057                 }
2058                 dma_buffer = outbuf_dma;
2059         }
2060
2061         if (taskin) {
2062                 inbuf = memdup_user(buf + intotal, taskin);
2063                 if (IS_ERR(inbuf)) {
2064                         err = PTR_ERR(inbuf);
2065                         inbuf = NULL;
2066                         goto abort;
2067                 }
2068                 inbuf_dma = pci_map_single(dd->pdev,
2069                                          inbuf,
2070                                          taskin, DMA_FROM_DEVICE);
2071                 if (pci_dma_mapping_error(dd->pdev, inbuf_dma)) {
2072                         err = -ENOMEM;
2073                         goto abort;
2074                 }
2075                 dma_buffer = inbuf_dma;
2076         }
2077
2078         /* only supports PIO and non-data commands from this ioctl. */
2079         switch (req_task->data_phase) {
2080         case TASKFILE_OUT:
2081                 nsect = taskout / ATA_SECT_SIZE;
2082                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
2083                 break;
2084         case TASKFILE_IN:
2085                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
2086                 break;
2087         case TASKFILE_NO_DATA:
2088                 reply = (dd->port->rxfis + RX_FIS_D2H_REG);
2089                 break;
2090         default:
2091                 err = -EINVAL;
2092                 goto abort;
2093         }
2094
2095         /* Build the FIS. */
2096         memset(&fis, 0, sizeof(struct host_to_dev_fis));
2097
2098         fis.type        = 0x27;
2099         fis.opts        = 1 << 7;
2100         fis.command     = req_task->io_ports[7];
2101         fis.features    = req_task->io_ports[1];
2102         fis.sect_count  = req_task->io_ports[2];
2103         fis.lba_low     = req_task->io_ports[3];
2104         fis.lba_mid     = req_task->io_ports[4];
2105         fis.lba_hi      = req_task->io_ports[5];
2106          /* Clear the dev bit*/
2107         fis.device      = req_task->io_ports[6] & ~0x10;
2108
2109         if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
2110                 req_task->in_flags.all  =
2111                         IDE_TASKFILE_STD_IN_FLAGS |
2112                         (IDE_HOB_STD_IN_FLAGS << 8);
2113                 fis.lba_low_ex          = req_task->hob_ports[3];
2114                 fis.lba_mid_ex          = req_task->hob_ports[4];
2115                 fis.lba_hi_ex           = req_task->hob_ports[5];
2116                 fis.features_ex         = req_task->hob_ports[1];
2117                 fis.sect_cnt_ex         = req_task->hob_ports[2];
2118
2119         } else {
2120                 req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
2121         }
2122
2123         force_single_sector = implicit_sector(fis.command, fis.features);
2124
2125         if ((taskin || taskout) && (!fis.sect_count)) {
2126                 if (nsect)
2127                         fis.sect_count = nsect;
2128                 else {
2129                         if (!force_single_sector) {
2130                                 dev_warn(&dd->pdev->dev,
2131                                         "data movement but "
2132                                         "sect_count is 0\n");
2133                                         err = -EINVAL;
2134                                         goto abort;
2135                         }
2136                 }
2137         }
2138
2139         dbg_printk(MTIP_DRV_NAME
2140                 " %s: cmd %x, feat %x, nsect %x,"
2141                 " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
2142                 " head/dev %x\n",
2143                 __func__,
2144                 fis.command,
2145                 fis.features,
2146                 fis.sect_count,
2147                 fis.lba_low,
2148                 fis.lba_mid,
2149                 fis.lba_hi,
2150                 fis.device);
2151
2152         /* check for erase mode support during secure erase.*/
2153         if ((fis.command == ATA_CMD_SEC_ERASE_UNIT) && outbuf &&
2154                                         (outbuf[0] & MTIP_SEC_ERASE_MODE)) {
2155                 erasemode = 1;
2156         }
2157
2158         mtip_set_timeout(dd, &fis, &timeout, erasemode);
2159
2160         /* Determine the correct transfer size.*/
2161         if (force_single_sector)
2162                 transfer_size = ATA_SECT_SIZE;
2163         else
2164                 transfer_size = ATA_SECT_SIZE * fis.sect_count;
2165
2166         /* Execute the command.*/
2167         if (mtip_exec_internal_command(dd->port,
2168                                  &fis,
2169                                  5,
2170                                  dma_buffer,
2171                                  transfer_size,
2172                                  0,
2173                                  GFP_KERNEL,
2174                                  timeout) < 0) {
2175                 err = -EIO;
2176                 goto abort;
2177         }
2178
2179         task_file_data = readl(dd->port->mmio+PORT_TFDATA);
2180
2181         if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
2182                 reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
2183                 req_task->io_ports[7] = reply->control;
2184         } else {
2185                 reply = dd->port->rxfis + RX_FIS_D2H_REG;
2186                 req_task->io_ports[7] = reply->command;
2187         }
2188
2189         /* reclaim the DMA buffers.*/
2190         if (inbuf_dma)
2191                 pci_unmap_single(dd->pdev, inbuf_dma,
2192                         taskin, DMA_FROM_DEVICE);
2193         if (outbuf_dma)
2194                 pci_unmap_single(dd->pdev, outbuf_dma,
2195                         taskout, DMA_TO_DEVICE);
2196         inbuf_dma  = 0;
2197         outbuf_dma = 0;
2198
2199         /* return the ATA registers to the caller.*/
2200         req_task->io_ports[1] = reply->features;
2201         req_task->io_ports[2] = reply->sect_count;
2202         req_task->io_ports[3] = reply->lba_low;
2203         req_task->io_ports[4] = reply->lba_mid;
2204         req_task->io_ports[5] = reply->lba_hi;
2205         req_task->io_ports[6] = reply->device;
2206
2207         if (req_task->out_flags.all & 1)  {
2208
2209                 req_task->hob_ports[3] = reply->lba_low_ex;
2210                 req_task->hob_ports[4] = reply->lba_mid_ex;
2211                 req_task->hob_ports[5] = reply->lba_hi_ex;
2212                 req_task->hob_ports[1] = reply->features_ex;
2213                 req_task->hob_ports[2] = reply->sect_cnt_ex;
2214         }
2215         dbg_printk(MTIP_DRV_NAME
2216                 " %s: Completion: stat %x,"
2217                 "err %x, sect_cnt %x, lbalo %x,"
2218                 "lbamid %x, lbahi %x, dev %x\n",
2219                 __func__,
2220                 req_task->io_ports[7],
2221                 req_task->io_ports[1],
2222                 req_task->io_ports[2],
2223                 req_task->io_ports[3],
2224                 req_task->io_ports[4],
2225                 req_task->io_ports[5],
2226                 req_task->io_ports[6]);
2227
2228         if (taskout) {
2229                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
2230                         err = -EFAULT;
2231                         goto abort;
2232                 }
2233         }
2234         if (taskin) {
2235                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
2236                         err = -EFAULT;
2237                         goto abort;
2238                 }
2239         }
2240 abort:
2241         if (inbuf_dma)
2242                 pci_unmap_single(dd->pdev, inbuf_dma,
2243                                         taskin, DMA_FROM_DEVICE);
2244         if (outbuf_dma)
2245                 pci_unmap_single(dd->pdev, outbuf_dma,
2246                                         taskout, DMA_TO_DEVICE);
2247         kfree(outbuf);
2248         kfree(inbuf);
2249
2250         return err;
2251 }
2252
2253 /*
2254  * Handle IOCTL calls from the Block Layer.
2255  *
2256  * This function is called by the Block Layer when it receives an IOCTL
2257  * command that it does not understand. If the IOCTL command is not supported
2258  * this function returns -ENOTTY.
2259  *
2260  * @dd  Pointer to the driver data structure.
2261  * @cmd IOCTL command passed from the Block Layer.
2262  * @arg IOCTL argument passed from the Block Layer.
2263  *
2264  * return value
2265  *      0       The IOCTL completed successfully.
2266  *      -ENOTTY The specified command is not supported.
2267  *      -EFAULT An error occurred copying data to a user space buffer.
2268  *      -EIO    An error occurred while executing the command.
2269  */
2270 static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
2271                          unsigned long arg)
2272 {
2273         switch (cmd) {
2274         case HDIO_GET_IDENTITY:
2275         {
2276                 if (copy_to_user((void __user *)arg, dd->port->identify,
2277                                                 sizeof(u16) * ATA_ID_WORDS))
2278                         return -EFAULT;
2279                 break;
2280         }
2281         case HDIO_DRIVE_CMD:
2282         {
2283                 u8 drive_command[4];
2284
2285                 /* Copy the user command info to our buffer. */
2286                 if (copy_from_user(drive_command,
2287                                          (void __user *) arg,
2288                                          sizeof(drive_command)))
2289                         return -EFAULT;
2290
2291                 /* Execute the drive command. */
2292                 if (exec_drive_command(dd->port,
2293                                          drive_command,
2294                                          (void __user *) (arg+4)))
2295                         return -EIO;
2296
2297                 /* Copy the status back to the users buffer. */
2298                 if (copy_to_user((void __user *) arg,
2299                                          drive_command,
2300                                          sizeof(drive_command)))
2301                         return -EFAULT;
2302
2303                 break;
2304         }
2305         case HDIO_DRIVE_TASK:
2306         {
2307                 u8 drive_command[7];
2308
2309                 /* Copy the user command info to our buffer. */
2310                 if (copy_from_user(drive_command,
2311                                          (void __user *) arg,
2312                                          sizeof(drive_command)))
2313                         return -EFAULT;
2314
2315                 /* Execute the drive command. */
2316                 if (exec_drive_task(dd->port, drive_command))
2317                         return -EIO;
2318
2319                 /* Copy the status back to the users buffer. */
2320                 if (copy_to_user((void __user *) arg,
2321                                          drive_command,
2322                                          sizeof(drive_command)))
2323                         return -EFAULT;
2324
2325                 break;
2326         }
2327         case HDIO_DRIVE_TASKFILE: {
2328                 ide_task_request_t req_task;
2329                 int ret, outtotal;
2330
2331                 if (copy_from_user(&req_task, (void __user *) arg,
2332                                         sizeof(req_task)))
2333                         return -EFAULT;
2334
2335                 outtotal = sizeof(req_task);
2336
2337                 ret = exec_drive_taskfile(dd, (void __user *) arg,
2338                                                 &req_task, outtotal);
2339
2340                 if (copy_to_user((void __user *) arg, &req_task,
2341                                                         sizeof(req_task)))
2342                         return -EFAULT;
2343
2344                 return ret;
2345         }
2346
2347         default:
2348                 return -EINVAL;
2349         }
2350         return 0;
2351 }
2352
2353 /*
2354  * Submit an IO to the hw
2355  *
2356  * This function is called by the block layer to issue an io
2357  * to the device. Upon completion, the callback function will
2358  * be called with the data parameter passed as the callback data.
2359  *
2360  * @dd       Pointer to the driver data structure.
2361  * @start    First sector to read.
2362  * @nsect    Number of sectors to read.
2363  * @nents    Number of entries in scatter list for the read command.
2364  * @tag      The tag of this read command.
2365  * @callback Pointer to the function that should be called
2366  *           when the read completes.
2367  * @data     Callback data passed to the callback function
2368  *           when the read completes.
2369  * @dir      Direction (read or write)
2370  *
2371  * return value
2372  *      None
2373  */
2374 static void mtip_hw_submit_io(struct driver_data *dd, struct request *rq,
2375                               struct mtip_cmd *command, int nents,
2376                               struct blk_mq_hw_ctx *hctx)
2377 {
2378         struct host_to_dev_fis  *fis;
2379         struct mtip_port *port = dd->port;
2380         int dma_dir = rq_data_dir(rq) == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2381         u64 start = blk_rq_pos(rq);
2382         unsigned int nsect = blk_rq_sectors(rq);
2383
2384         /* Map the scatter list for DMA access */
2385         nents = dma_map_sg(&dd->pdev->dev, command->sg, nents, dma_dir);
2386
2387         prefetch(&port->flags);
2388
2389         command->scatter_ents = nents;
2390
2391         /*
2392          * The number of retries for this command before it is
2393          * reported as a failure to the upper layers.
2394          */
2395         command->retries = MTIP_MAX_RETRIES;
2396
2397         /* Fill out fis */
2398         fis = command->command;
2399         fis->type        = 0x27;
2400         fis->opts        = 1 << 7;
2401         if (dma_dir == DMA_FROM_DEVICE)
2402                 fis->command = ATA_CMD_FPDMA_READ;
2403         else
2404                 fis->command = ATA_CMD_FPDMA_WRITE;
2405         fis->lba_low     = start & 0xFF;
2406         fis->lba_mid     = (start >> 8) & 0xFF;
2407         fis->lba_hi      = (start >> 16) & 0xFF;
2408         fis->lba_low_ex  = (start >> 24) & 0xFF;
2409         fis->lba_mid_ex  = (start >> 32) & 0xFF;
2410         fis->lba_hi_ex   = (start >> 40) & 0xFF;
2411         fis->device      = 1 << 6;
2412         fis->features    = nsect & 0xFF;
2413         fis->features_ex = (nsect >> 8) & 0xFF;
2414         fis->sect_count  = ((rq->tag << 3) | (rq->tag >> 5));
2415         fis->sect_cnt_ex = 0;
2416         fis->control     = 0;
2417         fis->res2        = 0;
2418         fis->res3        = 0;
2419         fill_command_sg(dd, command, nents);
2420
2421         if (unlikely(command->unaligned))
2422                 fis->device |= 1 << 7;
2423
2424         /* Populate the command header */
2425         command->command_header->opts =
2426                         __force_bit2int cpu_to_le32(
2427                                 (nents << 16) | 5 | AHCI_CMD_PREFETCH);
2428         command->command_header->byte_count = 0;
2429
2430         /*
2431          * Set the completion function and data for the command
2432          * within this layer.
2433          */
2434         command->comp_data = dd;
2435         command->comp_func = mtip_async_complete;
2436         command->direction = dma_dir;
2437
2438         /*
2439          * To prevent this command from being issued
2440          * if an internal command is in progress or error handling is active.
2441          */
2442         if (unlikely(port->flags & MTIP_PF_PAUSE_IO)) {
2443                 set_bit(rq->tag, port->cmds_to_issue);
2444                 set_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2445                 return;
2446         }
2447
2448         /* Issue the command to the hardware */
2449         mtip_issue_ncq_command(port, rq->tag);
2450 }
2451
2452 /*
2453  * Sysfs status dump.
2454  *
2455  * @dev  Pointer to the device structure, passed by the kernrel.
2456  * @attr Pointer to the device_attribute structure passed by the kernel.
2457  * @buf  Pointer to the char buffer that will receive the stats info.
2458  *
2459  * return value
2460  *      The size, in bytes, of the data copied into buf.
2461  */
2462 static ssize_t mtip_hw_show_status(struct device *dev,
2463                                 struct device_attribute *attr,
2464                                 char *buf)
2465 {
2466         struct driver_data *dd = dev_to_disk(dev)->private_data;
2467         int size = 0;
2468
2469         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
2470                 size += sprintf(buf, "%s", "thermal_shutdown\n");
2471         else if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag))
2472                 size += sprintf(buf, "%s", "write_protect\n");
2473         else
2474                 size += sprintf(buf, "%s", "online\n");
2475
2476         return size;
2477 }
2478
2479 static DEVICE_ATTR(status, S_IRUGO, mtip_hw_show_status, NULL);
2480
2481 /* debugsfs entries */
2482
2483 static ssize_t show_device_status(struct device_driver *drv, char *buf)
2484 {
2485         int size = 0;
2486         struct driver_data *dd, *tmp;
2487         unsigned long flags;
2488         char id_buf[42];
2489         u16 status = 0;
2490
2491         spin_lock_irqsave(&dev_lock, flags);
2492         size += sprintf(&buf[size], "Devices Present:\n");
2493         list_for_each_entry_safe(dd, tmp, &online_list, online_list) {
2494                 if (dd->pdev) {
2495                         if (dd->port &&
2496                             dd->port->identify &&
2497                             dd->port->identify_valid) {
2498                                 strlcpy(id_buf,
2499                                         (char *) (dd->port->identify + 10), 21);
2500                                 status = *(dd->port->identify + 141);
2501                         } else {
2502                                 memset(id_buf, 0, 42);
2503                                 status = 0;
2504                         }
2505
2506                         if (dd->port &&
2507                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2508                                 size += sprintf(&buf[size],
2509                                         " device %s %s (ftl rebuild %d %%)\n",
2510                                         dev_name(&dd->pdev->dev),
2511                                         id_buf,
2512                                         status);
2513                         } else {
2514                                 size += sprintf(&buf[size],
2515                                         " device %s %s\n",
2516                                         dev_name(&dd->pdev->dev),
2517                                         id_buf);
2518                         }
2519                 }
2520         }
2521
2522         size += sprintf(&buf[size], "Devices Being Removed:\n");
2523         list_for_each_entry_safe(dd, tmp, &removing_list, remove_list) {
2524                 if (dd->pdev) {
2525                         if (dd->port &&
2526                             dd->port->identify &&
2527                             dd->port->identify_valid) {
2528                                 strlcpy(id_buf,
2529                                         (char *) (dd->port->identify+10), 21);
2530                                 status = *(dd->port->identify + 141);
2531                         } else {
2532                                 memset(id_buf, 0, 42);
2533                                 status = 0;
2534                         }
2535
2536                         if (dd->port &&
2537                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2538                                 size += sprintf(&buf[size],
2539                                         " device %s %s (ftl rebuild %d %%)\n",
2540                                         dev_name(&dd->pdev->dev),
2541                                         id_buf,
2542                                         status);
2543                         } else {
2544                                 size += sprintf(&buf[size],
2545                                         " device %s %s\n",
2546                                         dev_name(&dd->pdev->dev),
2547                                         id_buf);
2548                         }
2549                 }
2550         }
2551         spin_unlock_irqrestore(&dev_lock, flags);
2552
2553         return size;
2554 }
2555
2556 static ssize_t mtip_hw_read_device_status(struct file *f, char __user *ubuf,
2557                                                 size_t len, loff_t *offset)
2558 {
2559         struct driver_data *dd =  (struct driver_data *)f->private_data;
2560         int size = *offset;
2561         char *buf;
2562         int rv = 0;
2563
2564         if (!len || *offset)
2565                 return 0;
2566
2567         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2568         if (!buf) {
2569                 dev_err(&dd->pdev->dev,
2570                         "Memory allocation: status buffer\n");
2571                 return -ENOMEM;
2572         }
2573
2574         size += show_device_status(NULL, buf);
2575
2576         *offset = size <= len ? size : len;
2577         size = copy_to_user(ubuf, buf, *offset);
2578         if (size)
2579                 rv = -EFAULT;
2580
2581         kfree(buf);
2582         return rv ? rv : *offset;
2583 }
2584
2585 static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
2586                                   size_t len, loff_t *offset)
2587 {
2588         struct driver_data *dd =  (struct driver_data *)f->private_data;
2589         char *buf;
2590         u32 group_allocated;
2591         int size = *offset;
2592         int n, rv = 0;
2593
2594         if (!len || size)
2595                 return 0;
2596
2597         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2598         if (!buf) {
2599                 dev_err(&dd->pdev->dev,
2600                         "Memory allocation: register buffer\n");
2601                 return -ENOMEM;
2602         }
2603
2604         size += sprintf(&buf[size], "H/ S ACTive      : [ 0x");
2605
2606         for (n = dd->slot_groups-1; n >= 0; n--)
2607                 size += sprintf(&buf[size], "%08X ",
2608                                          readl(dd->port->s_active[n]));
2609
2610         size += sprintf(&buf[size], "]\n");
2611         size += sprintf(&buf[size], "H/ Command Issue : [ 0x");
2612
2613         for (n = dd->slot_groups-1; n >= 0; n--)
2614                 size += sprintf(&buf[size], "%08X ",
2615                                         readl(dd->port->cmd_issue[n]));
2616
2617         size += sprintf(&buf[size], "]\n");
2618         size += sprintf(&buf[size], "H/ Completed     : [ 0x");
2619
2620         for (n = dd->slot_groups-1; n >= 0; n--)
2621                 size += sprintf(&buf[size], "%08X ",
2622                                 readl(dd->port->completed[n]));
2623
2624         size += sprintf(&buf[size], "]\n");
2625         size += sprintf(&buf[size], "H/ PORT IRQ STAT : [ 0x%08X ]\n",
2626                                 readl(dd->port->mmio + PORT_IRQ_STAT));
2627         size += sprintf(&buf[size], "H/ HOST IRQ STAT : [ 0x%08X ]\n",
2628                                 readl(dd->mmio + HOST_IRQ_STAT));
2629         size += sprintf(&buf[size], "\n");
2630
2631         size += sprintf(&buf[size], "L/ Commands in Q : [ 0x");
2632
2633         for (n = dd->slot_groups-1; n >= 0; n--) {
2634                 if (sizeof(long) > sizeof(u32))
2635                         group_allocated =
2636                                 dd->port->cmds_to_issue[n/2] >> (32*(n&1));
2637                 else
2638                         group_allocated = dd->port->cmds_to_issue[n];
2639                 size += sprintf(&buf[size], "%08X ", group_allocated);
2640         }
2641         size += sprintf(&buf[size], "]\n");
2642
2643         *offset = size <= len ? size : len;
2644         size = copy_to_user(ubuf, buf, *offset);
2645         if (size)
2646                 rv = -EFAULT;
2647
2648         kfree(buf);
2649         return rv ? rv : *offset;
2650 }
2651
2652 static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
2653                                   size_t len, loff_t *offset)
2654 {
2655         struct driver_data *dd =  (struct driver_data *)f->private_data;
2656         char *buf;
2657         int size = *offset;
2658         int rv = 0;
2659
2660         if (!len || size)
2661                 return 0;
2662
2663         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2664         if (!buf) {
2665                 dev_err(&dd->pdev->dev,
2666                         "Memory allocation: flag buffer\n");
2667                 return -ENOMEM;
2668         }
2669
2670         size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
2671                                                         dd->port->flags);
2672         size += sprintf(&buf[size], "Flag-dd   : [ %08lX ]\n",
2673                                                         dd->dd_flag);
2674
2675         *offset = size <= len ? size : len;
2676         size = copy_to_user(ubuf, buf, *offset);
2677         if (size)
2678                 rv = -EFAULT;
2679
2680         kfree(buf);
2681         return rv ? rv : *offset;
2682 }
2683
2684 static const struct file_operations mtip_device_status_fops = {
2685         .owner  = THIS_MODULE,
2686         .open   = simple_open,
2687         .read   = mtip_hw_read_device_status,
2688         .llseek = no_llseek,
2689 };
2690
2691 static const struct file_operations mtip_regs_fops = {
2692         .owner  = THIS_MODULE,
2693         .open   = simple_open,
2694         .read   = mtip_hw_read_registers,
2695         .llseek = no_llseek,
2696 };
2697
2698 static const struct file_operations mtip_flags_fops = {
2699         .owner  = THIS_MODULE,
2700         .open   = simple_open,
2701         .read   = mtip_hw_read_flags,
2702         .llseek = no_llseek,
2703 };
2704
2705 /*
2706  * Create the sysfs related attributes.
2707  *
2708  * @dd   Pointer to the driver data structure.
2709  * @kobj Pointer to the kobj for the block device.
2710  *
2711  * return value
2712  *      0       Operation completed successfully.
2713  *      -EINVAL Invalid parameter.
2714  */
2715 static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
2716 {
2717         if (!kobj || !dd)
2718                 return -EINVAL;
2719
2720         if (sysfs_create_file(kobj, &dev_attr_status.attr))
2721                 dev_warn(&dd->pdev->dev,
2722                         "Error creating 'status' sysfs entry\n");
2723         return 0;
2724 }
2725
2726 /*
2727  * Remove the sysfs related attributes.
2728  *
2729  * @dd   Pointer to the driver data structure.
2730  * @kobj Pointer to the kobj for the block device.
2731  *
2732  * return value
2733  *      0       Operation completed successfully.
2734  *      -EINVAL Invalid parameter.
2735  */
2736 static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
2737 {
2738         if (!kobj || !dd)
2739                 return -EINVAL;
2740
2741         sysfs_remove_file(kobj, &dev_attr_status.attr);
2742
2743         return 0;
2744 }
2745
2746 static int mtip_hw_debugfs_init(struct driver_data *dd)
2747 {
2748         if (!dfs_parent)
2749                 return -1;
2750
2751         dd->dfs_node = debugfs_create_dir(dd->disk->disk_name, dfs_parent);
2752         if (IS_ERR_OR_NULL(dd->dfs_node)) {
2753                 dev_warn(&dd->pdev->dev,
2754                         "Error creating node %s under debugfs\n",
2755                                                 dd->disk->disk_name);
2756                 dd->dfs_node = NULL;
2757                 return -1;
2758         }
2759
2760         debugfs_create_file("flags", S_IRUGO, dd->dfs_node, dd,
2761                                                         &mtip_flags_fops);
2762         debugfs_create_file("registers", S_IRUGO, dd->dfs_node, dd,
2763                                                         &mtip_regs_fops);
2764
2765         return 0;
2766 }
2767
2768 static void mtip_hw_debugfs_exit(struct driver_data *dd)
2769 {
2770         if (dd->dfs_node)
2771                 debugfs_remove_recursive(dd->dfs_node);
2772 }
2773
2774 /*
2775  * Perform any init/resume time hardware setup
2776  *
2777  * @dd Pointer to the driver data structure.
2778  *
2779  * return value
2780  *      None
2781  */
2782 static inline void hba_setup(struct driver_data *dd)
2783 {
2784         u32 hwdata;
2785         hwdata = readl(dd->mmio + HOST_HSORG);
2786
2787         /* interrupt bug workaround: use only 1 IS bit.*/
2788         writel(hwdata |
2789                 HSORG_DISABLE_SLOTGRP_INTR |
2790                 HSORG_DISABLE_SLOTGRP_PXIS,
2791                 dd->mmio + HOST_HSORG);
2792 }
2793
2794 static int mtip_device_unaligned_constrained(struct driver_data *dd)
2795 {
2796         return (dd->pdev->device == P420M_DEVICE_ID ? 1 : 0);
2797 }
2798
2799 /*
2800  * Detect the details of the product, and store anything needed
2801  * into the driver data structure.  This includes product type and
2802  * version and number of slot groups.
2803  *
2804  * @dd Pointer to the driver data structure.
2805  *
2806  * return value
2807  *      None
2808  */
2809 static void mtip_detect_product(struct driver_data *dd)
2810 {
2811         u32 hwdata;
2812         unsigned int rev, slotgroups;
2813
2814         /*
2815          * HBA base + 0xFC [15:0] - vendor-specific hardware interface
2816          * info register:
2817          * [15:8] hardware/software interface rev#
2818          * [   3] asic-style interface
2819          * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
2820          */
2821         hwdata = readl(dd->mmio + HOST_HSORG);
2822
2823         dd->product_type = MTIP_PRODUCT_UNKNOWN;
2824         dd->slot_groups = 1;
2825
2826         if (hwdata & 0x8) {
2827                 dd->product_type = MTIP_PRODUCT_ASICFPGA;
2828                 rev = (hwdata & HSORG_HWREV) >> 8;
2829                 slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
2830                 dev_info(&dd->pdev->dev,
2831                         "ASIC-FPGA design, HS rev 0x%x, "
2832                         "%i slot groups [%i slots]\n",
2833                          rev,
2834                          slotgroups,
2835                          slotgroups * 32);
2836
2837                 if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
2838                         dev_warn(&dd->pdev->dev,
2839                                 "Warning: driver only supports "
2840                                 "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
2841                         slotgroups = MTIP_MAX_SLOT_GROUPS;
2842                 }
2843                 dd->slot_groups = slotgroups;
2844                 return;
2845         }
2846
2847         dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
2848 }
2849
2850 /*
2851  * Blocking wait for FTL rebuild to complete
2852  *
2853  * @dd Pointer to the DRIVER_DATA structure.
2854  *
2855  * return value
2856  *      0       FTL rebuild completed successfully
2857  *      -EFAULT FTL rebuild error/timeout/interruption
2858  */
2859 static int mtip_ftl_rebuild_poll(struct driver_data *dd)
2860 {
2861         unsigned long timeout, cnt = 0, start;
2862
2863         dev_warn(&dd->pdev->dev,
2864                 "FTL rebuild in progress. Polling for completion.\n");
2865
2866         start = jiffies;
2867         timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
2868
2869         do {
2870                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2871                                 &dd->dd_flag)))
2872                         return -EFAULT;
2873                 if (mtip_check_surprise_removal(dd->pdev))
2874                         return -EFAULT;
2875
2876                 if (mtip_get_identify(dd->port, NULL) < 0)
2877                         return -EFAULT;
2878
2879                 if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2880                         MTIP_FTL_REBUILD_MAGIC) {
2881                         ssleep(1);
2882                         /* Print message every 3 minutes */
2883                         if (cnt++ >= 180) {
2884                                 dev_warn(&dd->pdev->dev,
2885                                 "FTL rebuild in progress (%d secs).\n",
2886                                 jiffies_to_msecs(jiffies - start) / 1000);
2887                                 cnt = 0;
2888                         }
2889                 } else {
2890                         dev_warn(&dd->pdev->dev,
2891                                 "FTL rebuild complete (%d secs).\n",
2892                         jiffies_to_msecs(jiffies - start) / 1000);
2893                         mtip_block_initialize(dd);
2894                         return 0;
2895                 }
2896         } while (time_before(jiffies, timeout));
2897
2898         /* Check for timeout */
2899         dev_err(&dd->pdev->dev,
2900                 "Timed out waiting for FTL rebuild to complete (%d secs).\n",
2901                 jiffies_to_msecs(jiffies - start) / 1000);
2902         return -EFAULT;
2903 }
2904
2905 static void mtip_softirq_done_fn(struct request *rq)
2906 {
2907         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
2908         struct driver_data *dd = rq->q->queuedata;
2909
2910         /* Unmap the DMA scatter list entries */
2911         dma_unmap_sg(&dd->pdev->dev, cmd->sg, cmd->scatter_ents,
2912                                                         cmd->direction);
2913
2914         if (unlikely(cmd->unaligned))
2915                 up(&dd->port->cmd_slot_unal);
2916
2917         blk_mq_end_request(rq, rq->errors);
2918 }
2919
2920 static void mtip_abort_cmd(struct request *req, void *data,
2921                                                         bool reserved)
2922 {
2923         struct driver_data *dd = data;
2924
2925         dbg_printk(MTIP_DRV_NAME " Aborting request, tag = %d\n", req->tag);
2926
2927         clear_bit(req->tag, dd->port->cmds_to_issue);
2928         req->errors = -EIO;
2929         mtip_softirq_done_fn(req);
2930 }
2931
2932 static void mtip_queue_cmd(struct request *req, void *data,
2933                                                         bool reserved)
2934 {
2935         struct driver_data *dd = data;
2936
2937         set_bit(req->tag, dd->port->cmds_to_issue);
2938         blk_abort_request(req);
2939 }
2940
2941 /*
2942  * service thread to issue queued commands
2943  *
2944  * @data Pointer to the driver data structure.
2945  *
2946  * return value
2947  *      0
2948  */
2949
2950 static int mtip_service_thread(void *data)
2951 {
2952         struct driver_data *dd = (struct driver_data *)data;
2953         unsigned long slot, slot_start, slot_wrap, to;
2954         unsigned int num_cmd_slots = dd->slot_groups * 32;
2955         struct mtip_port *port = dd->port;
2956
2957         while (1) {
2958                 if (kthread_should_stop() ||
2959                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2960                         goto st_out;
2961                 clear_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2962
2963                 /*
2964                  * the condition is to check neither an internal command is
2965                  * is in progress nor error handling is active
2966                  */
2967                 wait_event_interruptible(port->svc_wait, (port->flags) &&
2968                         (port->flags & MTIP_PF_SVC_THD_WORK));
2969
2970                 if (kthread_should_stop() ||
2971                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2972                         goto st_out;
2973
2974                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2975                                 &dd->dd_flag)))
2976                         goto st_out;
2977
2978                 set_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2979
2980 restart_eh:
2981                 /* Demux bits: start with error handling */
2982                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags)) {
2983                         mtip_handle_tfe(dd);
2984                         clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
2985                 }
2986
2987                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags))
2988                         goto restart_eh;
2989
2990                 if (test_bit(MTIP_PF_TO_ACTIVE_BIT, &port->flags)) {
2991                         to = jiffies + msecs_to_jiffies(5000);
2992
2993                         do {
2994                                 mdelay(100);
2995                         } while (atomic_read(&dd->irq_workers_active) != 0 &&
2996                                 time_before(jiffies, to));
2997
2998                         if (atomic_read(&dd->irq_workers_active) != 0)
2999                                 dev_warn(&dd->pdev->dev,
3000                                         "Completion workers still active!");
3001
3002                         spin_lock(dd->queue->queue_lock);
3003                         blk_mq_tagset_busy_iter(&dd->tags,
3004                                                         mtip_queue_cmd, dd);
3005                         spin_unlock(dd->queue->queue_lock);
3006
3007                         set_bit(MTIP_PF_ISSUE_CMDS_BIT, &dd->port->flags);
3008
3009                         if (mtip_device_reset(dd))
3010                                 blk_mq_tagset_busy_iter(&dd->tags,
3011                                                         mtip_abort_cmd, dd);
3012
3013                         clear_bit(MTIP_PF_TO_ACTIVE_BIT, &dd->port->flags);
3014                 }
3015
3016                 if (test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
3017                         slot = 1;
3018                         /* used to restrict the loop to one iteration */
3019                         slot_start = num_cmd_slots;
3020                         slot_wrap = 0;
3021                         while (1) {
3022                                 slot = find_next_bit(port->cmds_to_issue,
3023                                                 num_cmd_slots, slot);
3024                                 if (slot_wrap == 1) {
3025                                         if ((slot_start >= slot) ||
3026                                                 (slot >= num_cmd_slots))
3027                                                 break;
3028                                 }
3029                                 if (unlikely(slot_start == num_cmd_slots))
3030                                         slot_start = slot;
3031
3032                                 if (unlikely(slot == num_cmd_slots)) {
3033                                         slot = 1;
3034                                         slot_wrap = 1;
3035                                         continue;
3036                                 }
3037
3038                                 /* Issue the command to the hardware */
3039                                 mtip_issue_ncq_command(port, slot);
3040
3041                                 clear_bit(slot, port->cmds_to_issue);
3042                         }
3043
3044                         clear_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
3045                 }
3046
3047                 if (test_bit(MTIP_PF_REBUILD_BIT, &port->flags)) {
3048                         if (mtip_ftl_rebuild_poll(dd) == 0)
3049                                 clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
3050                 }
3051         }
3052
3053 st_out:
3054         return 0;
3055 }
3056
3057 /*
3058  * DMA region teardown
3059  *
3060  * @dd Pointer to driver_data structure
3061  *
3062  * return value
3063  *      None
3064  */
3065 static void mtip_dma_free(struct driver_data *dd)
3066 {
3067         struct mtip_port *port = dd->port;
3068
3069         if (port->block1)
3070                 dmam_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
3071                                         port->block1, port->block1_dma);
3072
3073         if (port->command_list) {
3074                 dmam_free_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
3075                                 port->command_list, port->command_list_dma);
3076         }
3077 }
3078
3079 /*
3080  * DMA region setup
3081  *
3082  * @dd Pointer to driver_data structure
3083  *
3084  * return value
3085  *      -ENOMEM Not enough free DMA region space to initialize driver
3086  */
3087 static int mtip_dma_alloc(struct driver_data *dd)
3088 {
3089         struct mtip_port *port = dd->port;
3090
3091         /* Allocate dma memory for RX Fis, Identify, and Sector Bufffer */
3092         port->block1 =
3093                 dmam_alloc_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
3094                                         &port->block1_dma, GFP_KERNEL);
3095         if (!port->block1)
3096                 return -ENOMEM;
3097         memset(port->block1, 0, BLOCK_DMA_ALLOC_SZ);
3098
3099         /* Allocate dma memory for command list */
3100         port->command_list =
3101                 dmam_alloc_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
3102                                         &port->command_list_dma, GFP_KERNEL);
3103         if (!port->command_list) {
3104                 dmam_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
3105                                         port->block1, port->block1_dma);
3106                 port->block1 = NULL;
3107                 port->block1_dma = 0;
3108                 return -ENOMEM;
3109         }
3110         memset(port->command_list, 0, AHCI_CMD_TBL_SZ);
3111
3112         /* Setup all pointers into first DMA region */
3113         port->rxfis         = port->block1 + AHCI_RX_FIS_OFFSET;
3114         port->rxfis_dma     = port->block1_dma + AHCI_RX_FIS_OFFSET;
3115         port->identify      = port->block1 + AHCI_IDFY_OFFSET;
3116         port->identify_dma  = port->block1_dma + AHCI_IDFY_OFFSET;
3117         port->log_buf       = port->block1 + AHCI_SECTBUF_OFFSET;
3118         port->log_buf_dma   = port->block1_dma + AHCI_SECTBUF_OFFSET;
3119         port->smart_buf     = port->block1 + AHCI_SMARTBUF_OFFSET;
3120         port->smart_buf_dma = port->block1_dma + AHCI_SMARTBUF_OFFSET;
3121
3122         return 0;
3123 }
3124
3125 static int mtip_hw_get_identify(struct driver_data *dd)
3126 {
3127         struct smart_attr attr242;
3128         unsigned char *buf;
3129         int rv;
3130
3131         if (mtip_get_identify(dd->port, NULL) < 0)
3132                 return -EFAULT;
3133
3134         if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
3135                 MTIP_FTL_REBUILD_MAGIC) {
3136                 set_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags);
3137                 return MTIP_FTL_REBUILD_MAGIC;
3138         }
3139         mtip_dump_identify(dd->port);
3140
3141         /* check write protect, over temp and rebuild statuses */
3142         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
3143                                 dd->port->log_buf,
3144                                 dd->port->log_buf_dma, 1);
3145         if (rv) {
3146                 dev_warn(&dd->pdev->dev,
3147                         "Error in READ LOG EXT (10h) command\n");
3148                 /* non-critical error, don't fail the load */
3149         } else {
3150                 buf = (unsigned char *)dd->port->log_buf;
3151                 if (buf[259] & 0x1) {
3152                         dev_info(&dd->pdev->dev,
3153                                 "Write protect bit is set.\n");
3154                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
3155                 }
3156                 if (buf[288] == 0xF7) {
3157                         dev_info(&dd->pdev->dev,
3158                                 "Exceeded Tmax, drive in thermal shutdown.\n");
3159                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
3160                 }
3161                 if (buf[288] == 0xBF) {
3162                         dev_info(&dd->pdev->dev,
3163                                 "Drive indicates rebuild has failed.\n");
3164                         set_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag);
3165                 }
3166         }
3167
3168         /* get write protect progess */
3169         memset(&attr242, 0, sizeof(struct smart_attr));
3170         if (mtip_get_smart_attr(dd->port, 242, &attr242))
3171                 dev_warn(&dd->pdev->dev,
3172                                 "Unable to check write protect progress\n");
3173         else
3174                 dev_info(&dd->pdev->dev,
3175                                 "Write protect progress: %u%% (%u blocks)\n",
3176                                 attr242.cur, le32_to_cpu(attr242.data));
3177
3178         return rv;
3179 }
3180
3181 /*
3182  * Called once for each card.
3183  *
3184  * @dd Pointer to the driver data structure.
3185  *
3186  * return value
3187  *      0 on success, else an error code.
3188  */
3189 static int mtip_hw_init(struct driver_data *dd)
3190 {
3191         int i;
3192         int rv;
3193         unsigned int num_command_slots;
3194         unsigned long timeout, timetaken;
3195
3196         dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
3197
3198         mtip_detect_product(dd);
3199         if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
3200                 rv = -EIO;
3201                 goto out1;
3202         }
3203         num_command_slots = dd->slot_groups * 32;
3204
3205         hba_setup(dd);
3206
3207         dd->port = kzalloc_node(sizeof(struct mtip_port), GFP_KERNEL,
3208                                 dd->numa_node);
3209         if (!dd->port) {
3210                 dev_err(&dd->pdev->dev,
3211                         "Memory allocation: port structure\n");
3212                 return -ENOMEM;
3213         }
3214
3215         /* Continue workqueue setup */
3216         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
3217                 dd->work[i].port = dd->port;
3218
3219         /* Enable unaligned IO constraints for some devices */
3220         if (mtip_device_unaligned_constrained(dd))
3221                 dd->unal_qdepth = MTIP_MAX_UNALIGNED_SLOTS;
3222         else
3223                 dd->unal_qdepth = 0;
3224
3225         sema_init(&dd->port->cmd_slot_unal, dd->unal_qdepth);
3226
3227         /* Spinlock to prevent concurrent issue */
3228         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
3229                 spin_lock_init(&dd->port->cmd_issue_lock[i]);
3230
3231         /* Set the port mmio base address. */
3232         dd->port->mmio  = dd->mmio + PORT_OFFSET;
3233         dd->port->dd    = dd;
3234
3235         /* DMA allocations */
3236         rv = mtip_dma_alloc(dd);
3237         if (rv < 0)
3238                 goto out1;
3239
3240         /* Setup the pointers to the extended s_active and CI registers. */
3241         for (i = 0; i < dd->slot_groups; i++) {
3242                 dd->port->s_active[i] =
3243                         dd->port->mmio + i*0x80 + PORT_SCR_ACT;
3244                 dd->port->cmd_issue[i] =
3245                         dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
3246                 dd->port->completed[i] =
3247                         dd->port->mmio + i*0x80 + PORT_SDBV;
3248         }
3249
3250         timetaken = jiffies;
3251         timeout = jiffies + msecs_to_jiffies(30000);
3252         while (((readl(dd->port->mmio + PORT_SCR_STAT) & 0x0F) != 0x03) &&
3253                  time_before(jiffies, timeout)) {
3254                 mdelay(100);
3255         }
3256         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
3257                 timetaken = jiffies - timetaken;
3258                 dev_warn(&dd->pdev->dev,
3259                         "Surprise removal detected at %u ms\n",
3260                         jiffies_to_msecs(timetaken));
3261                 rv = -ENODEV;
3262                 goto out2 ;
3263         }
3264         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
3265                 timetaken = jiffies - timetaken;
3266                 dev_warn(&dd->pdev->dev,
3267                         "Removal detected at %u ms\n",
3268                         jiffies_to_msecs(timetaken));
3269                 rv = -EFAULT;
3270                 goto out2;
3271         }
3272
3273         /* Conditionally reset the HBA. */
3274         if (!(readl(dd->mmio + HOST_CAP) & HOST_CAP_NZDMA)) {
3275                 if (mtip_hba_reset(dd) < 0) {
3276                         dev_err(&dd->pdev->dev,
3277                                 "Card did not reset within timeout\n");
3278                         rv = -EIO;
3279                         goto out2;
3280                 }
3281         } else {
3282                 /* Clear any pending interrupts on the HBA */
3283                 writel(readl(dd->mmio + HOST_IRQ_STAT),
3284                         dd->mmio + HOST_IRQ_STAT);
3285         }
3286
3287         mtip_init_port(dd->port);
3288         mtip_start_port(dd->port);
3289
3290         /* Setup the ISR and enable interrupts. */
3291         rv = devm_request_irq(&dd->pdev->dev,
3292                                 dd->pdev->irq,
3293                                 mtip_irq_handler,
3294                                 IRQF_SHARED,
3295                                 dev_driver_string(&dd->pdev->dev),
3296                                 dd);
3297
3298         if (rv) {
3299                 dev_err(&dd->pdev->dev,
3300                         "Unable to allocate IRQ %d\n", dd->pdev->irq);
3301                 goto out2;
3302         }
3303         irq_set_affinity_hint(dd->pdev->irq, get_cpu_mask(dd->isr_binding));
3304
3305         /* Enable interrupts on the HBA. */
3306         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3307                                         dd->mmio + HOST_CTL);
3308
3309         init_waitqueue_head(&dd->port->svc_wait);
3310
3311         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
3312                 rv = -EFAULT;
3313                 goto out3;
3314         }
3315
3316         return rv;
3317
3318 out3:
3319         /* Disable interrupts on the HBA. */
3320         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3321                         dd->mmio + HOST_CTL);
3322
3323         /* Release the IRQ. */
3324         irq_set_affinity_hint(dd->pdev->irq, NULL);
3325         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3326
3327 out2:
3328         mtip_deinit_port(dd->port);
3329         mtip_dma_free(dd);
3330
3331 out1:
3332         /* Free the memory allocated for the for structure. */
3333         kfree(dd->port);
3334
3335         return rv;
3336 }
3337
3338 static int mtip_standby_drive(struct driver_data *dd)
3339 {
3340         int rv = 0;
3341
3342         if (dd->sr || !dd->port)
3343                 return -ENODEV;
3344         /*
3345          * Send standby immediate (E0h) to the drive so that it
3346          * saves its state.
3347          */
3348         if (!test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags) &&
3349             !test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag) &&
3350             !test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag)) {
3351                 rv = mtip_standby_immediate(dd->port);
3352                 if (rv)
3353                         dev_warn(&dd->pdev->dev,
3354                                 "STANDBY IMMEDIATE failed\n");
3355         }
3356         return rv;
3357 }
3358
3359 /*
3360  * Called to deinitialize an interface.
3361  *
3362  * @dd Pointer to the driver data structure.
3363  *
3364  * return value
3365  *      0
3366  */
3367 static int mtip_hw_exit(struct driver_data *dd)
3368 {
3369         if (!dd->sr) {
3370                 /* de-initialize the port. */
3371                 mtip_deinit_port(dd->port);
3372
3373                 /* Disable interrupts on the HBA. */
3374                 writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3375                                 dd->mmio + HOST_CTL);
3376         }
3377
3378         /* Release the IRQ. */
3379         irq_set_affinity_hint(dd->pdev->irq, NULL);
3380         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3381         msleep(1000);
3382
3383         /* Free dma regions */
3384         mtip_dma_free(dd);
3385
3386         /* Free the memory allocated for the for structure. */
3387         kfree(dd->port);
3388         dd->port = NULL;
3389
3390         return 0;
3391 }
3392
3393 /*
3394  * Issue a Standby Immediate command to the device.
3395  *
3396  * This function is called by the Block Layer just before the
3397  * system powers off during a shutdown.
3398  *
3399  * @dd Pointer to the driver data structure.
3400  *
3401  * return value
3402  *      0
3403  */
3404 static int mtip_hw_shutdown(struct driver_data *dd)
3405 {
3406         /*
3407          * Send standby immediate (E0h) to the drive so that it
3408          * saves its state.
3409          */
3410         mtip_standby_drive(dd);
3411
3412         return 0;
3413 }
3414
3415 /*
3416  * Suspend function
3417  *
3418  * This function is called by the Block Layer just before the
3419  * system hibernates.
3420  *
3421  * @dd Pointer to the driver data structure.
3422  *
3423  * return value
3424  *      0       Suspend was successful
3425  *      -EFAULT Suspend was not successful
3426  */
3427 static int mtip_hw_suspend(struct driver_data *dd)
3428 {
3429         /*
3430          * Send standby immediate (E0h) to the drive
3431          * so that it saves its state.
3432          */
3433         if (mtip_standby_drive(dd) != 0) {
3434                 dev_err(&dd->pdev->dev,
3435                         "Failed standby-immediate command\n");
3436                 return -EFAULT;
3437         }
3438
3439         /* Disable interrupts on the HBA.*/
3440         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3441                         dd->mmio + HOST_CTL);
3442         mtip_deinit_port(dd->port);
3443
3444         return 0;
3445 }
3446
3447 /*
3448  * Resume function
3449  *
3450  * This function is called by the Block Layer as the
3451  * system resumes.
3452  *
3453  * @dd Pointer to the driver data structure.
3454  *
3455  * return value
3456  *      0       Resume was successful
3457  *      -EFAULT Resume was not successful
3458  */
3459 static int mtip_hw_resume(struct driver_data *dd)
3460 {
3461         /* Perform any needed hardware setup steps */
3462         hba_setup(dd);
3463
3464         /* Reset the HBA */
3465         if (mtip_hba_reset(dd) != 0) {
3466                 dev_err(&dd->pdev->dev,
3467                         "Unable to reset the HBA\n");
3468                 return -EFAULT;
3469         }
3470
3471         /*
3472          * Enable the port, DMA engine, and FIS reception specific
3473          * h/w in controller.
3474          */
3475         mtip_init_port(dd->port);
3476         mtip_start_port(dd->port);
3477
3478         /* Enable interrupts on the HBA.*/
3479         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3480                         dd->mmio + HOST_CTL);
3481
3482         return 0;
3483 }
3484
3485 /*
3486  * Helper function for reusing disk name
3487  * upon hot insertion.
3488  */
3489 static int rssd_disk_name_format(char *prefix,
3490                                  int index,
3491                                  char *buf,
3492                                  int buflen)
3493 {
3494         const int base = 'z' - 'a' + 1;
3495         char *begin = buf + strlen(prefix);
3496         char *end = buf + buflen;
3497         char *p;
3498         int unit;
3499
3500         p = end - 1;
3501         *p = '\0';
3502         unit = base;
3503         do {
3504                 if (p == begin)
3505                         return -EINVAL;
3506                 *--p = 'a' + (index % unit);
3507                 index = (index / unit) - 1;
3508         } while (index >= 0);
3509
3510         memmove(begin, p, end - p);
3511         memcpy(buf, prefix, strlen(prefix));
3512
3513         return 0;
3514 }
3515
3516 /*
3517  * Block layer IOCTL handler.
3518  *
3519  * @dev Pointer to the block_device structure.
3520  * @mode ignored
3521  * @cmd IOCTL command passed from the user application.
3522  * @arg Argument passed from the user application.
3523  *
3524  * return value
3525  *      0        IOCTL completed successfully.
3526  *      -ENOTTY  IOCTL not supported or invalid driver data
3527  *                 structure pointer.
3528  */
3529 static int mtip_block_ioctl(struct block_device *dev,
3530                             fmode_t mode,
3531                             unsigned cmd,
3532                             unsigned long arg)
3533 {
3534         struct driver_data *dd = dev->bd_disk->private_data;
3535
3536         if (!capable(CAP_SYS_ADMIN))
3537                 return -EACCES;
3538
3539         if (!dd)
3540                 return -ENOTTY;
3541
3542         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3543                 return -ENOTTY;
3544
3545         switch (cmd) {
3546         case BLKFLSBUF:
3547                 return -ENOTTY;
3548         default:
3549                 return mtip_hw_ioctl(dd, cmd, arg);
3550         }
3551 }
3552
3553 #ifdef CONFIG_COMPAT
3554 /*
3555  * Block layer compat IOCTL handler.
3556  *
3557  * @dev Pointer to the block_device structure.
3558  * @mode ignored
3559  * @cmd IOCTL command passed from the user application.
3560  * @arg Argument passed from the user application.
3561  *
3562  * return value
3563  *      0        IOCTL completed successfully.
3564  *      -ENOTTY  IOCTL not supported or invalid driver data
3565  *                 structure pointer.
3566  */
3567 static int mtip_block_compat_ioctl(struct block_device *dev,
3568                             fmode_t mode,
3569                             unsigned cmd,
3570                             unsigned long arg)
3571 {
3572         struct driver_data *dd = dev->bd_disk->private_data;
3573
3574         if (!capable(CAP_SYS_ADMIN))
3575                 return -EACCES;
3576
3577         if (!dd)
3578                 return -ENOTTY;
3579
3580         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3581                 return -ENOTTY;
3582
3583         switch (cmd) {
3584         case BLKFLSBUF:
3585                 return -ENOTTY;
3586         case HDIO_DRIVE_TASKFILE: {
3587                 struct mtip_compat_ide_task_request_s __user *compat_req_task;
3588                 ide_task_request_t req_task;
3589                 int compat_tasksize, outtotal, ret;
3590
3591                 compat_tasksize =
3592                         sizeof(struct mtip_compat_ide_task_request_s);
3593
3594                 compat_req_task =
3595                         (struct mtip_compat_ide_task_request_s __user *) arg;
3596
3597                 if (copy_from_user(&req_task, (void __user *) arg,
3598                         compat_tasksize - (2 * sizeof(compat_long_t))))
3599                         return -EFAULT;
3600
3601                 if (get_user(req_task.out_size, &compat_req_task->out_size))
3602                         return -EFAULT;
3603
3604                 if (get_user(req_task.in_size, &compat_req_task->in_size))
3605                         return -EFAULT;
3606
3607                 outtotal = sizeof(struct mtip_compat_ide_task_request_s);
3608
3609                 ret = exec_drive_taskfile(dd, (void __user *) arg,
3610                                                 &req_task, outtotal);
3611
3612                 if (copy_to_user((void __user *) arg, &req_task,
3613                                 compat_tasksize -
3614                                 (2 * sizeof(compat_long_t))))
3615                         return -EFAULT;
3616
3617                 if (put_user(req_task.out_size, &compat_req_task->out_size))
3618                         return -EFAULT;
3619
3620                 if (put_user(req_task.in_size, &compat_req_task->in_size))
3621                         return -EFAULT;
3622
3623                 return ret;
3624         }
3625         default:
3626                 return mtip_hw_ioctl(dd, cmd, arg);
3627         }
3628 }
3629 #endif
3630
3631 /*
3632  * Obtain the geometry of the device.
3633  *
3634  * You may think that this function is obsolete, but some applications,
3635  * fdisk for example still used CHS values. This function describes the
3636  * device as having 224 heads and 56 sectors per cylinder. These values are
3637  * chosen so that each cylinder is aligned on a 4KB boundary. Since a
3638  * partition is described in terms of a start and end cylinder this means
3639  * that each partition is also 4KB aligned. Non-aligned partitions adversely
3640  * affects performance.
3641  *
3642  * @dev Pointer to the block_device strucutre.
3643  * @geo Pointer to a hd_geometry structure.
3644  *
3645  * return value
3646  *      0       Operation completed successfully.
3647  *      -ENOTTY An error occurred while reading the drive capacity.
3648  */
3649 static int mtip_block_getgeo(struct block_device *dev,
3650                                 struct hd_geometry *geo)
3651 {
3652         struct driver_data *dd = dev->bd_disk->private_data;
3653         sector_t capacity;
3654
3655         if (!dd)
3656                 return -ENOTTY;
3657
3658         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3659                 dev_warn(&dd->pdev->dev,
3660                         "Could not get drive capacity.\n");
3661                 return -ENOTTY;
3662         }
3663
3664         geo->heads = 224;
3665         geo->sectors = 56;
3666         sector_div(capacity, (geo->heads * geo->sectors));
3667         geo->cylinders = capacity;
3668         return 0;
3669 }
3670
3671 static int mtip_block_open(struct block_device *dev, fmode_t mode)
3672 {
3673         struct driver_data *dd;
3674
3675         if (dev && dev->bd_disk) {
3676                 dd = (struct driver_data *) dev->bd_disk->private_data;
3677
3678                 if (dd) {
3679                         if (test_bit(MTIP_DDF_REMOVAL_BIT,
3680                                                         &dd->dd_flag)) {
3681                                 return -ENODEV;
3682                         }
3683                         return 0;
3684                 }
3685         }
3686         return -ENODEV;
3687 }
3688
3689 void mtip_block_release(struct gendisk *disk, fmode_t mode)
3690 {
3691 }
3692
3693 /*
3694  * Block device operation function.
3695  *
3696  * This structure contains pointers to the functions required by the block
3697  * layer.
3698  */
3699 static const struct block_device_operations mtip_block_ops = {
3700         .open           = mtip_block_open,
3701         .release        = mtip_block_release,
3702         .ioctl          = mtip_block_ioctl,
3703 #ifdef CONFIG_COMPAT
3704         .compat_ioctl   = mtip_block_compat_ioctl,
3705 #endif
3706         .getgeo         = mtip_block_getgeo,
3707         .owner          = THIS_MODULE
3708 };
3709
3710 static inline bool is_se_active(struct driver_data *dd)
3711 {
3712         if (unlikely(test_bit(MTIP_PF_SE_ACTIVE_BIT, &dd->port->flags))) {
3713                 if (dd->port->ic_pause_timer) {
3714                         unsigned long to = dd->port->ic_pause_timer +
3715                                                         msecs_to_jiffies(1000);
3716                         if (time_after(jiffies, to)) {
3717                                 clear_bit(MTIP_PF_SE_ACTIVE_BIT,
3718                                                         &dd->port->flags);
3719                                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag);
3720                                 dd->port->ic_pause_timer = 0;
3721                                 wake_up_interruptible(&dd->port->svc_wait);
3722                                 return false;
3723                         }
3724                 }
3725                 return true;
3726         }
3727         return false;
3728 }
3729
3730 /*
3731  * Block layer make request function.
3732  *
3733  * This function is called by the kernel to process a BIO for
3734  * the P320 device.
3735  *
3736  * @queue Pointer to the request queue. Unused other than to obtain
3737  *              the driver data structure.
3738  * @rq    Pointer to the request.
3739  *
3740  */
3741 static int mtip_submit_request(struct blk_mq_hw_ctx *hctx, struct request *rq)
3742 {
3743         struct driver_data *dd = hctx->queue->queuedata;
3744         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3745         unsigned int nents;
3746
3747         if (is_se_active(dd))
3748                 return -ENODATA;
3749
3750         if (unlikely(dd->dd_flag & MTIP_DDF_STOP_IO)) {
3751                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
3752                                                         &dd->dd_flag))) {
3753                         return -ENXIO;
3754                 }
3755                 if (unlikely(test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))) {
3756                         return -ENODATA;
3757                 }
3758                 if (unlikely(test_bit(MTIP_DDF_WRITE_PROTECT_BIT,
3759                                                         &dd->dd_flag) &&
3760                                 rq_data_dir(rq))) {
3761                         return -ENODATA;
3762                 }
3763                 if (unlikely(test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag) ||
3764                         test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag)))
3765                         return -ENODATA;
3766         }
3767
3768         if (rq->cmd_flags & REQ_DISCARD) {
3769                 int err;
3770
3771                 err = mtip_send_trim(dd, blk_rq_pos(rq), blk_rq_sectors(rq));
3772                 blk_mq_end_request(rq, err);
3773                 return 0;
3774         }
3775
3776         /* Create the scatter list for this request. */
3777         nents = blk_rq_map_sg(hctx->queue, rq, cmd->sg);
3778
3779         /* Issue the read/write. */
3780         mtip_hw_submit_io(dd, rq, cmd, nents, hctx);
3781         return 0;
3782 }
3783
3784 static bool mtip_check_unal_depth(struct blk_mq_hw_ctx *hctx,
3785                                   struct request *rq)
3786 {
3787         struct driver_data *dd = hctx->queue->queuedata;
3788         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3789
3790         if (rq_data_dir(rq) == READ || !dd->unal_qdepth)
3791                 return false;
3792
3793         /*
3794          * If unaligned depth must be limited on this controller, mark it
3795          * as unaligned if the IO isn't on a 4k boundary (start of length).
3796          */
3797         if (blk_rq_sectors(rq) <= 64) {
3798                 if ((blk_rq_pos(rq) & 7) || (blk_rq_sectors(rq) & 7))
3799                         cmd->unaligned = 1;
3800         }
3801
3802         if (cmd->unaligned && down_trylock(&dd->port->cmd_slot_unal))
3803                 return true;
3804
3805         return false;
3806 }
3807
3808 static int mtip_queue_rq(struct blk_mq_hw_ctx *hctx,
3809                          const struct blk_mq_queue_data *bd)
3810 {
3811         struct request *rq = bd->rq;
3812         int ret;
3813
3814         if (unlikely(mtip_check_unal_depth(hctx, rq)))
3815                 return BLK_MQ_RQ_QUEUE_BUSY;
3816
3817         blk_mq_start_request(rq);
3818
3819         ret = mtip_submit_request(hctx, rq);
3820         if (likely(!ret))
3821                 return BLK_MQ_RQ_QUEUE_OK;
3822
3823         rq->errors = ret;
3824         return BLK_MQ_RQ_QUEUE_ERROR;
3825 }
3826
3827 static void mtip_free_cmd(void *data, struct request *rq,
3828                           unsigned int hctx_idx, unsigned int request_idx)
3829 {
3830         struct driver_data *dd = data;
3831         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3832
3833         if (!cmd->command)
3834                 return;
3835
3836         dmam_free_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
3837                                 cmd->command, cmd->command_dma);
3838 }
3839
3840 static int mtip_init_cmd(void *data, struct request *rq, unsigned int hctx_idx,
3841                          unsigned int request_idx, unsigned int numa_node)
3842 {
3843         struct driver_data *dd = data;
3844         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3845         u32 host_cap_64 = readl(dd->mmio + HOST_CAP) & HOST_CAP_64;
3846
3847         /*
3848          * For flush requests, request_idx starts at the end of the
3849          * tag space.  Since we don't support FLUSH/FUA, simply return
3850          * 0 as there's nothing to be done.
3851          */
3852         if (request_idx >= MTIP_MAX_COMMAND_SLOTS)
3853                 return 0;
3854
3855         cmd->command = dmam_alloc_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
3856                         &cmd->command_dma, GFP_KERNEL);
3857         if (!cmd->command)
3858                 return -ENOMEM;
3859
3860         memset(cmd->command, 0, CMD_DMA_ALLOC_SZ);
3861
3862         /* Point the command headers at the command tables. */
3863         cmd->command_header = dd->port->command_list +
3864                                 (sizeof(struct mtip_cmd_hdr) * request_idx);
3865         cmd->command_header_dma = dd->port->command_list_dma +
3866                                 (sizeof(struct mtip_cmd_hdr) * request_idx);
3867
3868         if (host_cap_64)
3869                 cmd->command_header->ctbau = __force_bit2int cpu_to_le32((cmd->command_dma >> 16) >> 16);
3870
3871         cmd->command_header->ctba = __force_bit2int cpu_to_le32(cmd->command_dma & 0xFFFFFFFF);
3872
3873         sg_init_table(cmd->sg, MTIP_MAX_SG);
3874         return 0;
3875 }
3876
3877 static enum blk_eh_timer_return mtip_cmd_timeout(struct request *req,
3878                                                                 bool reserved)
3879 {
3880         struct driver_data *dd = req->q->queuedata;
3881
3882         if (reserved)
3883                 goto exit_handler;
3884
3885         if (test_bit(req->tag, dd->port->cmds_to_issue))
3886                 goto exit_handler;
3887
3888         if (test_and_set_bit(MTIP_PF_TO_ACTIVE_BIT, &dd->port->flags))
3889                 goto exit_handler;
3890
3891         wake_up_interruptible(&dd->port->svc_wait);
3892 exit_handler:
3893         return BLK_EH_RESET_TIMER;
3894 }
3895
3896 static struct blk_mq_ops mtip_mq_ops = {
3897         .queue_rq       = mtip_queue_rq,
3898         .map_queue      = blk_mq_map_queue,
3899         .init_request   = mtip_init_cmd,
3900         .exit_request   = mtip_free_cmd,
3901         .complete       = mtip_softirq_done_fn,
3902         .timeout        = mtip_cmd_timeout,
3903 };
3904
3905 /*
3906  * Block layer initialization function.
3907  *
3908  * This function is called once by the PCI layer for each P320
3909  * device that is connected to the system.
3910  *
3911  * @dd Pointer to the driver data structure.
3912  *
3913  * return value
3914  *      0 on success else an error code.
3915  */
3916 static int mtip_block_initialize(struct driver_data *dd)
3917 {
3918         int rv = 0, wait_for_rebuild = 0;
3919         sector_t capacity;
3920         unsigned int index = 0;
3921         struct kobject *kobj;
3922
3923         if (dd->disk)
3924                 goto skip_create_disk; /* hw init done, before rebuild */
3925
3926         if (mtip_hw_init(dd)) {
3927                 rv = -EINVAL;
3928                 goto protocol_init_error;
3929         }
3930
3931         dd->disk = alloc_disk_node(MTIP_MAX_MINORS, dd->numa_node);
3932         if (dd->disk  == NULL) {
3933                 dev_err(&dd->pdev->dev,
3934                         "Unable to allocate gendisk structure\n");
3935                 rv = -EINVAL;
3936                 goto alloc_disk_error;
3937         }
3938
3939         /* Generate the disk name, implemented same as in sd.c */
3940         do {
3941                 if (!ida_pre_get(&rssd_index_ida, GFP_KERNEL))
3942                         goto ida_get_error;
3943
3944                 spin_lock(&rssd_index_lock);
3945                 rv = ida_get_new(&rssd_index_ida, &index);
3946                 spin_unlock(&rssd_index_lock);
3947         } while (rv == -EAGAIN);
3948
3949         if (rv)
3950                 goto ida_get_error;
3951
3952         rv = rssd_disk_name_format("rssd",
3953                                 index,
3954                                 dd->disk->disk_name,
3955                                 DISK_NAME_LEN);
3956         if (rv)
3957                 goto disk_index_error;
3958
3959         dd->disk->driverfs_dev  = &dd->pdev->dev;
3960         dd->disk->major         = dd->major;
3961         dd->disk->first_minor   = index * MTIP_MAX_MINORS;
3962         dd->disk->minors        = MTIP_MAX_MINORS;
3963         dd->disk->fops          = &mtip_block_ops;
3964         dd->disk->private_data  = dd;
3965         dd->index               = index;
3966
3967         mtip_hw_debugfs_init(dd);
3968
3969         memset(&dd->tags, 0, sizeof(dd->tags));
3970         dd->tags.ops = &mtip_mq_ops;
3971         dd->tags.nr_hw_queues = 1;
3972         dd->tags.queue_depth = MTIP_MAX_COMMAND_SLOTS;
3973         dd->tags.reserved_tags = 1;
3974         dd->tags.cmd_size = sizeof(struct mtip_cmd);
3975         dd->tags.numa_node = dd->numa_node;
3976         dd->tags.flags = BLK_MQ_F_SHOULD_MERGE;
3977         dd->tags.driver_data = dd;
3978         dd->tags.timeout = MTIP_NCQ_CMD_TIMEOUT_MS;
3979
3980         rv = blk_mq_alloc_tag_set(&dd->tags);
3981         if (rv) {
3982                 dev_err(&dd->pdev->dev,
3983                         "Unable to allocate request queue\n");
3984                 goto block_queue_alloc_tag_error;
3985         }
3986
3987         /* Allocate the request queue. */
3988         dd->queue = blk_mq_init_queue(&dd->tags);
3989         if (IS_ERR(dd->queue)) {
3990                 dev_err(&dd->pdev->dev,
3991                         "Unable to allocate request queue\n");
3992                 rv = -ENOMEM;
3993                 goto block_queue_alloc_init_error;
3994         }
3995
3996         dd->disk->queue         = dd->queue;
3997         dd->queue->queuedata    = dd;
3998
3999 skip_create_disk:
4000         /* Initialize the protocol layer. */
4001         wait_for_rebuild = mtip_hw_get_identify(dd);
4002         if (wait_for_rebuild < 0) {
4003                 dev_err(&dd->pdev->dev,
4004                         "Protocol layer initialization failed\n");
4005                 rv = -EINVAL;
4006                 goto init_hw_cmds_error;
4007         }
4008
4009         /*
4010          * if rebuild pending, start the service thread, and delay the block
4011          * queue creation and add_disk()
4012          */
4013         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
4014                 goto start_service_thread;
4015
4016         /* Set device limits. */
4017         set_bit(QUEUE_FLAG_NONROT, &dd->queue->queue_flags);
4018         clear_bit(QUEUE_FLAG_ADD_RANDOM, &dd->queue->queue_flags);
4019         blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
4020         blk_queue_physical_block_size(dd->queue, 4096);
4021         blk_queue_max_hw_sectors(dd->queue, 0xffff);
4022         blk_queue_max_segment_size(dd->queue, 0x400000);
4023         blk_queue_io_min(dd->queue, 4096);
4024         blk_queue_bounce_limit(dd->queue, dd->pdev->dma_mask);
4025
4026         /* Signal trim support */
4027         if (dd->trim_supp == true) {
4028                 set_bit(QUEUE_FLAG_DISCARD, &dd->queue->queue_flags);
4029                 dd->queue->limits.discard_granularity = 4096;
4030                 blk_queue_max_discard_sectors(dd->queue,
4031                         MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES);
4032                 dd->queue->limits.discard_zeroes_data = 0;
4033         }
4034
4035         /* Set the capacity of the device in 512 byte sectors. */
4036         if (!(mtip_hw_get_capacity(dd, &capacity))) {
4037                 dev_warn(&dd->pdev->dev,
4038                         "Could not read drive capacity\n");
4039                 rv = -EIO;
4040                 goto read_capacity_error;
4041         }
4042         set_capacity(dd->disk, capacity);
4043
4044         /* Enable the block device and add it to /dev */
4045         add_disk(dd->disk);
4046
4047         dd->bdev = bdget_disk(dd->disk, 0);
4048         /*
4049          * Now that the disk is active, initialize any sysfs attributes
4050          * managed by the protocol layer.
4051          */
4052         kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
4053         if (kobj) {
4054                 mtip_hw_sysfs_init(dd, kobj);
4055                 kobject_put(kobj);
4056         }
4057
4058         if (dd->mtip_svc_handler) {
4059                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4060                 return rv; /* service thread created for handling rebuild */
4061         }
4062
4063 start_service_thread:
4064         dd->mtip_svc_handler = kthread_create_on_node(mtip_service_thread,
4065                                                 dd, dd->numa_node,
4066                                                 "mtip_svc_thd_%02d", index);
4067
4068         if (IS_ERR(dd->mtip_svc_handler)) {
4069                 dev_err(&dd->pdev->dev, "service thread failed to start\n");
4070                 dd->mtip_svc_handler = NULL;
4071                 rv = -EFAULT;
4072                 goto kthread_run_error;
4073         }
4074         wake_up_process(dd->mtip_svc_handler);
4075         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
4076                 rv = wait_for_rebuild;
4077
4078         return rv;
4079
4080 kthread_run_error:
4081         bdput(dd->bdev);
4082         dd->bdev = NULL;
4083
4084         /* Delete our gendisk. This also removes the device from /dev */
4085         del_gendisk(dd->disk);
4086
4087 read_capacity_error:
4088 init_hw_cmds_error:
4089         blk_cleanup_queue(dd->queue);
4090 block_queue_alloc_init_error:
4091         blk_mq_free_tag_set(&dd->tags);
4092 block_queue_alloc_tag_error:
4093         mtip_hw_debugfs_exit(dd);
4094 disk_index_error:
4095         spin_lock(&rssd_index_lock);
4096         ida_remove(&rssd_index_ida, index);
4097         spin_unlock(&rssd_index_lock);
4098
4099 ida_get_error:
4100         put_disk(dd->disk);
4101
4102 alloc_disk_error:
4103         mtip_hw_exit(dd); /* De-initialize the protocol layer. */
4104
4105 protocol_init_error:
4106         return rv;
4107 }
4108
4109 static void mtip_no_dev_cleanup(struct request *rq, void *data, bool reserv)
4110 {
4111         struct driver_data *dd = (struct driver_data *)data;
4112         struct mtip_cmd *cmd;
4113
4114         if (likely(!reserv))
4115                 blk_mq_complete_request(rq, -ENODEV);
4116         else if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &dd->port->flags)) {
4117
4118                 cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
4119                 if (cmd->comp_func)
4120                         cmd->comp_func(dd->port, MTIP_TAG_INTERNAL,
4121                                         cmd, -ENODEV);
4122         }
4123 }
4124
4125 /*
4126  * Block layer deinitialization function.
4127  *
4128  * Called by the PCI layer as each P320 device is removed.
4129  *
4130  * @dd Pointer to the driver data structure.
4131  *
4132  * return value
4133  *      0
4134  */
4135 static int mtip_block_remove(struct driver_data *dd)
4136 {
4137         struct kobject *kobj;
4138
4139         mtip_hw_debugfs_exit(dd);
4140
4141         if (dd->mtip_svc_handler) {
4142                 set_bit(MTIP_PF_SVC_THD_STOP_BIT, &dd->port->flags);
4143                 wake_up_interruptible(&dd->port->svc_wait);
4144                 kthread_stop(dd->mtip_svc_handler);
4145         }
4146
4147         /* Clean up the sysfs attributes, if created */
4148         if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag)) {
4149                 kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
4150                 if (kobj) {
4151                         mtip_hw_sysfs_exit(dd, kobj);
4152                         kobject_put(kobj);
4153                 }
4154         }
4155
4156         if (!dd->sr) {
4157                 /*
4158                  * Explicitly wait here for IOs to quiesce,
4159                  * as mtip_standby_drive usually won't wait for IOs.
4160                  */
4161                 if (!mtip_quiesce_io(dd->port, MTIP_QUIESCE_IO_TIMEOUT_MS,
4162                                                                 GFP_KERNEL))
4163                         mtip_standby_drive(dd);
4164         }
4165         else
4166                 dev_info(&dd->pdev->dev, "device %s surprise removal\n",
4167                                                 dd->disk->disk_name);
4168
4169         blk_mq_freeze_queue_start(dd->queue);
4170         blk_mq_stop_hw_queues(dd->queue);
4171         blk_mq_tagset_busy_iter(&dd->tags, mtip_no_dev_cleanup, dd);
4172
4173         /*
4174          * Delete our gendisk structure. This also removes the device
4175          * from /dev
4176          */
4177         if (dd->bdev) {
4178                 bdput(dd->bdev);
4179                 dd->bdev = NULL;
4180         }
4181         if (dd->disk) {
4182                 if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
4183                         del_gendisk(dd->disk);
4184                 if (dd->disk->queue) {
4185                         blk_cleanup_queue(dd->queue);
4186                         blk_mq_free_tag_set(&dd->tags);
4187                         dd->queue = NULL;
4188                 }
4189                 put_disk(dd->disk);
4190         }
4191         dd->disk  = NULL;
4192
4193         spin_lock(&rssd_index_lock);
4194         ida_remove(&rssd_index_ida, dd->index);
4195         spin_unlock(&rssd_index_lock);
4196
4197         /* De-initialize the protocol layer. */
4198         mtip_hw_exit(dd);
4199
4200         return 0;
4201 }
4202
4203 /*
4204  * Function called by the PCI layer when just before the
4205  * machine shuts down.
4206  *
4207  * If a protocol layer shutdown function is present it will be called
4208  * by this function.
4209  *
4210  * @dd Pointer to the driver data structure.
4211  *
4212  * return value
4213  *      0
4214  */
4215 static int mtip_block_shutdown(struct driver_data *dd)
4216 {
4217         mtip_hw_shutdown(dd);
4218
4219         /* Delete our gendisk structure, and cleanup the blk queue. */
4220         if (dd->disk) {
4221                 dev_info(&dd->pdev->dev,
4222                         "Shutting down %s ...\n", dd->disk->disk_name);
4223
4224                 if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
4225                         del_gendisk(dd->disk);
4226                 if (dd->disk->queue) {
4227                         blk_cleanup_queue(dd->queue);
4228                         blk_mq_free_tag_set(&dd->tags);
4229                 }
4230                 put_disk(dd->disk);
4231                 dd->disk  = NULL;
4232                 dd->queue = NULL;
4233         }
4234
4235         spin_lock(&rssd_index_lock);
4236         ida_remove(&rssd_index_ida, dd->index);
4237         spin_unlock(&rssd_index_lock);
4238         return 0;
4239 }
4240
4241 static int mtip_block_suspend(struct driver_data *dd)
4242 {
4243         dev_info(&dd->pdev->dev,
4244                 "Suspending %s ...\n", dd->disk->disk_name);
4245         mtip_hw_suspend(dd);
4246         return 0;
4247 }
4248
4249 static int mtip_block_resume(struct driver_data *dd)
4250 {
4251         dev_info(&dd->pdev->dev, "Resuming %s ...\n",
4252                 dd->disk->disk_name);
4253         mtip_hw_resume(dd);
4254         return 0;
4255 }
4256
4257 static void drop_cpu(int cpu)
4258 {
4259         cpu_use[cpu]--;
4260 }
4261
4262 static int get_least_used_cpu_on_node(int node)
4263 {
4264         int cpu, least_used_cpu, least_cnt;
4265         const struct cpumask *node_mask;
4266
4267         node_mask = cpumask_of_node(node);
4268         least_used_cpu = cpumask_first(node_mask);
4269         least_cnt = cpu_use[least_used_cpu];
4270         cpu = least_used_cpu;
4271
4272         for_each_cpu(cpu, node_mask) {
4273                 if (cpu_use[cpu] < least_cnt) {
4274                         least_used_cpu = cpu;
4275                         least_cnt = cpu_use[cpu];
4276                 }
4277         }
4278         cpu_use[least_used_cpu]++;
4279         return least_used_cpu;
4280 }
4281
4282 /* Helper for selecting a node in round robin mode */
4283 static inline int mtip_get_next_rr_node(void)
4284 {
4285         static int next_node = -1;
4286
4287         if (next_node == -1) {
4288                 next_node = first_online_node;
4289                 return next_node;
4290         }
4291
4292         next_node = next_online_node(next_node);
4293         if (next_node == MAX_NUMNODES)
4294                 next_node = first_online_node;
4295         return next_node;
4296 }
4297
4298 static DEFINE_HANDLER(0);
4299 static DEFINE_HANDLER(1);
4300 static DEFINE_HANDLER(2);
4301 static DEFINE_HANDLER(3);
4302 static DEFINE_HANDLER(4);
4303 static DEFINE_HANDLER(5);
4304 static DEFINE_HANDLER(6);
4305 static DEFINE_HANDLER(7);
4306
4307 static void mtip_disable_link_opts(struct driver_data *dd, struct pci_dev *pdev)
4308 {
4309         int pos;
4310         unsigned short pcie_dev_ctrl;
4311
4312         pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
4313         if (pos) {
4314                 pci_read_config_word(pdev,
4315                         pos + PCI_EXP_DEVCTL,
4316                         &pcie_dev_ctrl);
4317                 if (pcie_dev_ctrl & (1 << 11) ||
4318                     pcie_dev_ctrl & (1 << 4)) {
4319                         dev_info(&dd->pdev->dev,
4320                                 "Disabling ERO/No-Snoop on bridge device %04x:%04x\n",
4321                                         pdev->vendor, pdev->device);
4322                         pcie_dev_ctrl &= ~(PCI_EXP_DEVCTL_NOSNOOP_EN |
4323                                                 PCI_EXP_DEVCTL_RELAX_EN);
4324                         pci_write_config_word(pdev,
4325                                 pos + PCI_EXP_DEVCTL,
4326                                 pcie_dev_ctrl);
4327                 }
4328         }
4329 }
4330
4331 static void mtip_fix_ero_nosnoop(struct driver_data *dd, struct pci_dev *pdev)
4332 {
4333         /*
4334          * This workaround is specific to AMD/ATI chipset with a PCI upstream
4335          * device with device id 0x5aXX
4336          */
4337         if (pdev->bus && pdev->bus->self) {
4338                 if (pdev->bus->self->vendor == PCI_VENDOR_ID_ATI &&
4339                     ((pdev->bus->self->device & 0xff00) == 0x5a00)) {
4340                         mtip_disable_link_opts(dd, pdev->bus->self);
4341                 } else {
4342                         /* Check further up the topology */
4343                         struct pci_dev *parent_dev = pdev->bus->self;
4344                         if (parent_dev->bus &&
4345                                 parent_dev->bus->parent &&
4346                                 parent_dev->bus->parent->self &&
4347                                 parent_dev->bus->parent->self->vendor ==
4348                                          PCI_VENDOR_ID_ATI &&
4349                                 (parent_dev->bus->parent->self->device &
4350                                         0xff00) == 0x5a00) {
4351                                 mtip_disable_link_opts(dd,
4352                                         parent_dev->bus->parent->self);
4353                         }
4354                 }
4355         }
4356 }
4357
4358 /*
4359  * Called for each supported PCI device detected.
4360  *
4361  * This function allocates the private data structure, enables the
4362  * PCI device and then calls the block layer initialization function.
4363  *
4364  * return value
4365  *      0 on success else an error code.
4366  */
4367 static int mtip_pci_probe(struct pci_dev *pdev,
4368                         const struct pci_device_id *ent)
4369 {
4370         int rv = 0;
4371         struct driver_data *dd = NULL;
4372         char cpu_list[256];
4373         const struct cpumask *node_mask;
4374         int cpu, i = 0, j = 0;
4375         int my_node = NUMA_NO_NODE;
4376         unsigned long flags;
4377
4378         /* Allocate memory for this devices private data. */
4379         my_node = pcibus_to_node(pdev->bus);
4380         if (my_node != NUMA_NO_NODE) {
4381                 if (!node_online(my_node))
4382                         my_node = mtip_get_next_rr_node();
4383         } else {
4384                 dev_info(&pdev->dev, "Kernel not reporting proximity, choosing a node\n");
4385                 my_node = mtip_get_next_rr_node();
4386         }
4387         dev_info(&pdev->dev, "NUMA node %d (closest: %d,%d, probe on %d:%d)\n",
4388                 my_node, pcibus_to_node(pdev->bus), dev_to_node(&pdev->dev),
4389                 cpu_to_node(raw_smp_processor_id()), raw_smp_processor_id());
4390
4391         dd = kzalloc_node(sizeof(struct driver_data), GFP_KERNEL, my_node);
4392         if (dd == NULL) {
4393                 dev_err(&pdev->dev,
4394                         "Unable to allocate memory for driver data\n");
4395                 return -ENOMEM;
4396         }
4397
4398         /* Attach the private data to this PCI device.  */
4399         pci_set_drvdata(pdev, dd);
4400
4401         rv = pcim_enable_device(pdev);
4402         if (rv < 0) {
4403                 dev_err(&pdev->dev, "Unable to enable device\n");
4404                 goto iomap_err;
4405         }
4406
4407         /* Map BAR5 to memory. */
4408         rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME);
4409         if (rv < 0) {
4410                 dev_err(&pdev->dev, "Unable to map regions\n");
4411                 goto iomap_err;
4412         }
4413
4414         if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
4415                 rv = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
4416
4417                 if (rv) {
4418                         rv = pci_set_consistent_dma_mask(pdev,
4419                                                 DMA_BIT_MASK(32));
4420                         if (rv) {
4421                                 dev_warn(&pdev->dev,
4422                                         "64-bit DMA enable failed\n");
4423                                 goto setmask_err;
4424                         }
4425                 }
4426         }
4427
4428         /* Copy the info we may need later into the private data structure. */
4429         dd->major       = mtip_major;
4430         dd->instance    = instance;
4431         dd->pdev        = pdev;
4432         dd->numa_node   = my_node;
4433
4434         INIT_LIST_HEAD(&dd->online_list);
4435         INIT_LIST_HEAD(&dd->remove_list);
4436
4437         memset(dd->workq_name, 0, 32);
4438         snprintf(dd->workq_name, 31, "mtipq%d", dd->instance);
4439
4440         dd->isr_workq = create_workqueue(dd->workq_name);
4441         if (!dd->isr_workq) {
4442                 dev_warn(&pdev->dev, "Can't create wq %d\n", dd->instance);
4443                 rv = -ENOMEM;
4444                 goto block_initialize_err;
4445         }
4446
4447         memset(cpu_list, 0, sizeof(cpu_list));
4448
4449         node_mask = cpumask_of_node(dd->numa_node);
4450         if (!cpumask_empty(node_mask)) {
4451                 for_each_cpu(cpu, node_mask)
4452                 {
4453                         snprintf(&cpu_list[j], 256 - j, "%d ", cpu);
4454                         j = strlen(cpu_list);
4455                 }
4456
4457                 dev_info(&pdev->dev, "Node %d on package %d has %d cpu(s): %s\n",
4458                         dd->numa_node,
4459                         topology_physical_package_id(cpumask_first(node_mask)),
4460                         nr_cpus_node(dd->numa_node),
4461                         cpu_list);
4462         } else
4463                 dev_dbg(&pdev->dev, "mtip32xx: node_mask empty\n");
4464
4465         dd->isr_binding = get_least_used_cpu_on_node(dd->numa_node);
4466         dev_info(&pdev->dev, "Initial IRQ binding node:cpu %d:%d\n",
4467                 cpu_to_node(dd->isr_binding), dd->isr_binding);
4468
4469         /* first worker context always runs in ISR */
4470         dd->work[0].cpu_binding = dd->isr_binding;
4471         dd->work[1].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4472         dd->work[2].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4473         dd->work[3].cpu_binding = dd->work[0].cpu_binding;
4474         dd->work[4].cpu_binding = dd->work[1].cpu_binding;
4475         dd->work[5].cpu_binding = dd->work[2].cpu_binding;
4476         dd->work[6].cpu_binding = dd->work[2].cpu_binding;
4477         dd->work[7].cpu_binding = dd->work[1].cpu_binding;
4478
4479         /* Log the bindings */
4480         for_each_present_cpu(cpu) {
4481                 memset(cpu_list, 0, sizeof(cpu_list));
4482                 for (i = 0, j = 0; i < MTIP_MAX_SLOT_GROUPS; i++) {
4483                         if (dd->work[i].cpu_binding == cpu) {
4484                                 snprintf(&cpu_list[j], 256 - j, "%d ", i);
4485                                 j = strlen(cpu_list);
4486                         }
4487                 }
4488                 if (j)
4489                         dev_info(&pdev->dev, "CPU %d: WQs %s\n", cpu, cpu_list);
4490         }
4491
4492         INIT_WORK(&dd->work[0].work, mtip_workq_sdbf0);
4493         INIT_WORK(&dd->work[1].work, mtip_workq_sdbf1);
4494         INIT_WORK(&dd->work[2].work, mtip_workq_sdbf2);
4495         INIT_WORK(&dd->work[3].work, mtip_workq_sdbf3);
4496         INIT_WORK(&dd->work[4].work, mtip_workq_sdbf4);
4497         INIT_WORK(&dd->work[5].work, mtip_workq_sdbf5);
4498         INIT_WORK(&dd->work[6].work, mtip_workq_sdbf6);
4499         INIT_WORK(&dd->work[7].work, mtip_workq_sdbf7);
4500
4501         pci_set_master(pdev);
4502         rv = pci_enable_msi(pdev);
4503         if (rv) {
4504                 dev_warn(&pdev->dev,
4505                         "Unable to enable MSI interrupt.\n");
4506                 goto msi_initialize_err;
4507         }
4508
4509         mtip_fix_ero_nosnoop(dd, pdev);
4510
4511         /* Initialize the block layer. */
4512         rv = mtip_block_initialize(dd);
4513         if (rv < 0) {
4514                 dev_err(&pdev->dev,
4515                         "Unable to initialize block layer\n");
4516                 goto block_initialize_err;
4517         }
4518
4519         /*
4520          * Increment the instance count so that each device has a unique
4521          * instance number.
4522          */
4523         instance++;
4524         if (rv != MTIP_FTL_REBUILD_MAGIC)
4525                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4526         else
4527                 rv = 0; /* device in rebuild state, return 0 from probe */
4528
4529         /* Add to online list even if in ftl rebuild */
4530         spin_lock_irqsave(&dev_lock, flags);
4531         list_add(&dd->online_list, &online_list);
4532         spin_unlock_irqrestore(&dev_lock, flags);
4533
4534         goto done;
4535
4536 block_initialize_err:
4537         pci_disable_msi(pdev);
4538
4539 msi_initialize_err:
4540         if (dd->isr_workq) {
4541                 flush_workqueue(dd->isr_workq);
4542                 destroy_workqueue(dd->isr_workq);
4543                 drop_cpu(dd->work[0].cpu_binding);
4544                 drop_cpu(dd->work[1].cpu_binding);
4545                 drop_cpu(dd->work[2].cpu_binding);
4546         }
4547 setmask_err:
4548         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4549
4550 iomap_err:
4551         kfree(dd);
4552         pci_set_drvdata(pdev, NULL);
4553         return rv;
4554 done:
4555         return rv;
4556 }
4557
4558 /*
4559  * Called for each probed device when the device is removed or the
4560  * driver is unloaded.
4561  *
4562  * return value
4563  *      None
4564  */
4565 static void mtip_pci_remove(struct pci_dev *pdev)
4566 {
4567         struct driver_data *dd = pci_get_drvdata(pdev);
4568         unsigned long flags, to;
4569
4570         set_bit(MTIP_DDF_REMOVAL_BIT, &dd->dd_flag);
4571
4572         spin_lock_irqsave(&dev_lock, flags);
4573         list_del_init(&dd->online_list);
4574         list_add(&dd->remove_list, &removing_list);
4575         spin_unlock_irqrestore(&dev_lock, flags);
4576
4577         mtip_check_surprise_removal(pdev);
4578         synchronize_irq(dd->pdev->irq);
4579
4580         /* Spin until workers are done */
4581         to = jiffies + msecs_to_jiffies(4000);
4582         do {
4583                 msleep(20);
4584         } while (atomic_read(&dd->irq_workers_active) != 0 &&
4585                 time_before(jiffies, to));
4586
4587         if (!dd->sr)
4588                 fsync_bdev(dd->bdev);
4589
4590         if (atomic_read(&dd->irq_workers_active) != 0) {
4591                 dev_warn(&dd->pdev->dev,
4592                         "Completion workers still active!\n");
4593         }
4594
4595         blk_set_queue_dying(dd->queue);
4596         set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
4597
4598         /* Clean up the block layer. */
4599         mtip_block_remove(dd);
4600
4601         if (dd->isr_workq) {
4602                 flush_workqueue(dd->isr_workq);
4603                 destroy_workqueue(dd->isr_workq);
4604                 drop_cpu(dd->work[0].cpu_binding);
4605                 drop_cpu(dd->work[1].cpu_binding);
4606                 drop_cpu(dd->work[2].cpu_binding);
4607         }
4608
4609         pci_disable_msi(pdev);
4610
4611         spin_lock_irqsave(&dev_lock, flags);
4612         list_del_init(&dd->remove_list);
4613         spin_unlock_irqrestore(&dev_lock, flags);
4614
4615         kfree(dd);
4616
4617         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4618         pci_set_drvdata(pdev, NULL);
4619 }
4620
4621 /*
4622  * Called for each probed device when the device is suspended.
4623  *
4624  * return value
4625  *      0  Success
4626  *      <0 Error
4627  */
4628 static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
4629 {
4630         int rv = 0;
4631         struct driver_data *dd = pci_get_drvdata(pdev);
4632
4633         if (!dd) {
4634                 dev_err(&pdev->dev,
4635                         "Driver private datastructure is NULL\n");
4636                 return -EFAULT;
4637         }
4638
4639         set_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4640
4641         /* Disable ports & interrupts then send standby immediate */
4642         rv = mtip_block_suspend(dd);
4643         if (rv < 0) {
4644                 dev_err(&pdev->dev,
4645                         "Failed to suspend controller\n");
4646                 return rv;
4647         }
4648
4649         /*
4650          * Save the pci config space to pdev structure &
4651          * disable the device
4652          */
4653         pci_save_state(pdev);
4654         pci_disable_device(pdev);
4655
4656         /* Move to Low power state*/
4657         pci_set_power_state(pdev, PCI_D3hot);
4658
4659         return rv;
4660 }
4661
4662 /*
4663  * Called for each probed device when the device is resumed.
4664  *
4665  * return value
4666  *      0  Success
4667  *      <0 Error
4668  */
4669 static int mtip_pci_resume(struct pci_dev *pdev)
4670 {
4671         int rv = 0;
4672         struct driver_data *dd;
4673
4674         dd = pci_get_drvdata(pdev);
4675         if (!dd) {
4676                 dev_err(&pdev->dev,
4677                         "Driver private datastructure is NULL\n");
4678                 return -EFAULT;
4679         }
4680
4681         /* Move the device to active State */
4682         pci_set_power_state(pdev, PCI_D0);
4683
4684         /* Restore PCI configuration space */
4685         pci_restore_state(pdev);
4686
4687         /* Enable the PCI device*/
4688         rv = pcim_enable_device(pdev);
4689         if (rv < 0) {
4690                 dev_err(&pdev->dev,
4691                         "Failed to enable card during resume\n");
4692                 goto err;
4693         }
4694         pci_set_master(pdev);
4695
4696         /*
4697          * Calls hbaReset, initPort, & startPort function
4698          * then enables interrupts
4699          */
4700         rv = mtip_block_resume(dd);
4701         if (rv < 0)
4702                 dev_err(&pdev->dev, "Unable to resume\n");
4703
4704 err:
4705         clear_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4706
4707         return rv;
4708 }
4709
4710 /*
4711  * Shutdown routine
4712  *
4713  * return value
4714  *      None
4715  */
4716 static void mtip_pci_shutdown(struct pci_dev *pdev)
4717 {
4718         struct driver_data *dd = pci_get_drvdata(pdev);
4719         if (dd)
4720                 mtip_block_shutdown(dd);
4721 }
4722
4723 /* Table of device ids supported by this driver. */
4724 static const struct pci_device_id mtip_pci_tbl[] = {
4725         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320H_DEVICE_ID) },
4726         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320M_DEVICE_ID) },
4727         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320S_DEVICE_ID) },
4728         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P325M_DEVICE_ID) },
4729         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420H_DEVICE_ID) },
4730         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420M_DEVICE_ID) },
4731         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P425M_DEVICE_ID) },
4732         { 0 }
4733 };
4734
4735 /* Structure that describes the PCI driver functions. */
4736 static struct pci_driver mtip_pci_driver = {
4737         .name                   = MTIP_DRV_NAME,
4738         .id_table               = mtip_pci_tbl,
4739         .probe                  = mtip_pci_probe,
4740         .remove                 = mtip_pci_remove,
4741         .suspend                = mtip_pci_suspend,
4742         .resume                 = mtip_pci_resume,
4743         .shutdown               = mtip_pci_shutdown,
4744 };
4745
4746 MODULE_DEVICE_TABLE(pci, mtip_pci_tbl);
4747
4748 /*
4749  * Module initialization function.
4750  *
4751  * Called once when the module is loaded. This function allocates a major
4752  * block device number to the Cyclone devices and registers the PCI layer
4753  * of the driver.
4754  *
4755  * Return value
4756  *      0 on success else error code.
4757  */
4758 static int __init mtip_init(void)
4759 {
4760         int error;
4761
4762         pr_info(MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n");
4763
4764         spin_lock_init(&dev_lock);
4765
4766         INIT_LIST_HEAD(&online_list);
4767         INIT_LIST_HEAD(&removing_list);
4768
4769         /* Allocate a major block device number to use with this driver. */
4770         error = register_blkdev(0, MTIP_DRV_NAME);
4771         if (error <= 0) {
4772                 pr_err("Unable to register block device (%d)\n",
4773                 error);
4774                 return -EBUSY;
4775         }
4776         mtip_major = error;
4777
4778         dfs_parent = debugfs_create_dir("rssd", NULL);
4779         if (IS_ERR_OR_NULL(dfs_parent)) {
4780                 pr_warn("Error creating debugfs parent\n");
4781                 dfs_parent = NULL;
4782         }
4783         if (dfs_parent) {
4784                 dfs_device_status = debugfs_create_file("device_status",
4785                                         S_IRUGO, dfs_parent, NULL,
4786                                         &mtip_device_status_fops);
4787                 if (IS_ERR_OR_NULL(dfs_device_status)) {
4788                         pr_err("Error creating device_status node\n");
4789                         dfs_device_status = NULL;
4790                 }
4791         }
4792
4793         /* Register our PCI operations. */
4794         error = pci_register_driver(&mtip_pci_driver);
4795         if (error) {
4796                 debugfs_remove(dfs_parent);
4797                 unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4798         }
4799
4800         return error;
4801 }
4802
4803 /*
4804  * Module de-initialization function.
4805  *
4806  * Called once when the module is unloaded. This function deallocates
4807  * the major block device number allocated by mtip_init() and
4808  * unregisters the PCI layer of the driver.
4809  *
4810  * Return value
4811  *      none
4812  */
4813 static void __exit mtip_exit(void)
4814 {
4815         /* Release the allocated major block device number. */
4816         unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4817
4818         /* Unregister the PCI driver. */
4819         pci_unregister_driver(&mtip_pci_driver);
4820
4821         debugfs_remove_recursive(dfs_parent);
4822 }
4823
4824 MODULE_AUTHOR("Micron Technology, Inc");
4825 MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
4826 MODULE_LICENSE("GPL");
4827 MODULE_VERSION(MTIP_DRV_VERSION);
4828
4829 module_init(mtip_init);
4830 module_exit(mtip_exit);