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