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_IDA(rssd_index_ida);
 122
 123 static int mtip_block_initialize(struct driver_data *dd);
 124
 125 #ifdef CONFIG_COMPAT
 126 struct mtip_compat_ide_task_request_s {
 127         __u8            io_ports[8];
 128         __u8            hob_ports[8];
 129         ide_reg_valid_t out_flags;
 130         ide_reg_valid_t in_flags;
 131         int             data_phase;
 132         int             req_cmd;
 133         compat_ulong_t  out_size;
 134         compat_ulong_t  in_size;
 135 };
 136 #endif
 137
 138 /*
 139  * This function check_for_surprise_removal is called
 140  * while card is removed from the system and it will
 141  * read the vendor id from the configration space
 142  *
 143  * @pdev Pointer to the pci_dev structure.
 144  *
 145  * return value
 146  *       true if device removed, else false
 147  */
 148 static bool mtip_check_surprise_removal(struct pci_dev *pdev)
 149 {
 150         u16 vendor_id = 0;
 151         struct driver_data *dd = pci_get_drvdata(pdev);
 152
 153         if (dd->sr)
 154                 return true;
 155
 156        /* Read the vendorID from the configuration space */
 157         pci_read_config_word(pdev, 0x00, &vendor_id);
 158         if (vendor_id == 0xFFFF) {
 159                 dd->sr = true;
 160                 if (dd->queue)
 161                         blk_queue_flag_set(QUEUE_FLAG_DEAD, dd->queue);
 162                 else
 163                         dev_warn(&dd->pdev->dev,
 164                                 "%s: dd->queue is NULL\n", __func__);
 165                 return true; /* device removed */
 166         }
 167
 168         return false; /* device present */
 169 }
 170
 171 /* we have to use runtime tag to setup command header */
 172 static void mtip_init_cmd_header(struct request *rq)
 173 {
 174         struct driver_data *dd = rq->q->queuedata;
 175         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
 176
 177         /* Point the command headers at the command tables. */
 178         cmd->command_header = dd->port->command_list +
 179                                 (sizeof(struct mtip_cmd_hdr) * rq->tag);
 180         cmd->command_header_dma = dd->port->command_list_dma +
 181                                 (sizeof(struct mtip_cmd_hdr) * rq->tag);
 182
 183         if (test_bit(MTIP_PF_HOST_CAP_64, &dd->port->flags))
 184                 cmd->command_header->ctbau = __force_bit2int cpu_to_le32((cmd->command_dma >> 16) >> 16);
 185
 186         cmd->command_header->ctba = __force_bit2int cpu_to_le32(cmd->command_dma & 0xFFFFFFFF);
 187 }
 188
 189 static struct mtip_cmd *mtip_get_int_command(struct driver_data *dd)
 190 {
 191         struct request *rq;
 192
 193         if (mtip_check_surprise_removal(dd->pdev))
 194                 return NULL;
 195
 196         rq = blk_mq_alloc_request(dd->queue, REQ_OP_DRV_IN, BLK_MQ_REQ_RESERVED);
 197         if (IS_ERR(rq))
 198                 return NULL;
 199
 200         /* Internal cmd isn't submitted via .queue_rq */
 201         mtip_init_cmd_header(rq);
 202
 203         return blk_mq_rq_to_pdu(rq);
 204 }
 205
 206 static struct mtip_cmd *mtip_cmd_from_tag(struct driver_data *dd,
 207                                           unsigned int tag)
 208 {
 209         struct blk_mq_hw_ctx *hctx = dd->queue->queue_hw_ctx[0];
 210
 211         return blk_mq_rq_to_pdu(blk_mq_tag_to_rq(hctx->tags, tag));
 212 }
 213
 214 /*
 215  * Reset the HBA (without sleeping)
 216  *
 217  * @dd Pointer to the driver data structure.
 218  *
 219  * return value
 220  *      0       The reset was successful.
 221  *      -1      The HBA Reset bit did not clear.
 222  */
 223 static int mtip_hba_reset(struct driver_data *dd)
 224 {
 225         unsigned long timeout;
 226
 227         /* Set the reset bit */
 228         writel(HOST_RESET, dd->mmio + HOST_CTL);
 229
 230         /* Flush */
 231         readl(dd->mmio + HOST_CTL);
 232
 233         /*
 234          * Spin for up to 10 seconds waiting for reset acknowledgement. Spec
 235          * is 1 sec but in LUN failure conditions, up to 10 secs are required
 236          */
 237         timeout = jiffies + msecs_to_jiffies(10000);
 238         do {
 239                 mdelay(10);
 240                 if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))
 241                         return -1;
 242
 243         } while ((readl(dd->mmio + HOST_CTL) & HOST_RESET)
 244                  && time_before(jiffies, timeout));
 245
 246         if (readl(dd->mmio + HOST_CTL) & HOST_RESET)
 247                 return -1;
 248
 249         return 0;
 250 }
 251
 252 /*
 253  * Issue a command to the hardware.
 254  *
 255  * Set the appropriate bit in the s_active and Command Issue hardware
 256  * registers, causing hardware command processing to begin.
 257  *
 258  * @port Pointer to the port structure.
 259  * @tag  The tag of the command to be issued.
 260  *
 261  * return value
 262  *      None
 263  */
 264 static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag)
 265 {
 266         int group = tag >> 5;
 267
 268         /* guard SACT and CI registers */
 269         spin_lock(&port->cmd_issue_lock[group]);
 270         writel((1 << MTIP_TAG_BIT(tag)),
 271                         port->s_active[MTIP_TAG_INDEX(tag)]);
 272         writel((1 << MTIP_TAG_BIT(tag)),
 273                         port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 274         spin_unlock(&port->cmd_issue_lock[group]);
 275 }
 276
 277 /*
 278  * Enable/disable the reception of FIS
 279  *
 280  * @port   Pointer to the port data structure
 281  * @enable 1 to enable, 0 to disable
 282  *
 283  * return value
 284  *      Previous state: 1 enabled, 0 disabled
 285  */
 286 static int mtip_enable_fis(struct mtip_port *port, int enable)
 287 {
 288         u32 tmp;
 289
 290         /* enable FIS reception */
 291         tmp = readl(port->mmio + PORT_CMD);
 292         if (enable)
 293                 writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 294         else
 295                 writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 296
 297         /* Flush */
 298         readl(port->mmio + PORT_CMD);
 299
 300         return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX));
 301 }
 302
 303 /*
 304  * Enable/disable the DMA engine
 305  *
 306  * @port   Pointer to the port data structure
 307  * @enable 1 to enable, 0 to disable
 308  *
 309  * return value
 310  *      Previous state: 1 enabled, 0 disabled.
 311  */
 312 static int mtip_enable_engine(struct mtip_port *port, int enable)
 313 {
 314         u32 tmp;
 315
 316         /* enable FIS reception */
 317         tmp = readl(port->mmio + PORT_CMD);
 318         if (enable)
 319                 writel(tmp | PORT_CMD_START, port->mmio + PORT_CMD);
 320         else
 321                 writel(tmp & ~PORT_CMD_START, port->mmio + PORT_CMD);
 322
 323         readl(port->mmio + PORT_CMD);
 324         return (((tmp & PORT_CMD_START) == PORT_CMD_START));
 325 }
 326
 327 /*
 328  * Enables the port DMA engine and FIS reception.
 329  *
 330  * return value
 331  *      None
 332  */
 333 static inline void mtip_start_port(struct mtip_port *port)
 334 {
 335         /* Enable FIS reception */
 336         mtip_enable_fis(port, 1);
 337
 338         /* Enable the DMA engine */
 339         mtip_enable_engine(port, 1);
 340 }
 341
 342 /*
 343  * Deinitialize a port by disabling port interrupts, the DMA engine,
 344  * and FIS reception.
 345  *
 346  * @port Pointer to the port structure
 347  *
 348  * return value
 349  *      None
 350  */
 351 static inline void mtip_deinit_port(struct mtip_port *port)
 352 {
 353         /* Disable interrupts on this port */
 354         writel(0, port->mmio + PORT_IRQ_MASK);
 355
 356         /* Disable the DMA engine */
 357         mtip_enable_engine(port, 0);
 358
 359         /* Disable FIS reception */
 360         mtip_enable_fis(port, 0);
 361 }
 362
 363 /*
 364  * Initialize a port.
 365  *
 366  * This function deinitializes the port by calling mtip_deinit_port() and
 367  * then initializes it by setting the command header and RX FIS addresses,
 368  * clearing the SError register and any pending port interrupts before
 369  * re-enabling the default set of port interrupts.
 370  *
 371  * @port Pointer to the port structure.
 372  *
 373  * return value
 374  *      None
 375  */
 376 static void mtip_init_port(struct mtip_port *port)
 377 {
 378         int i;
 379         mtip_deinit_port(port);
 380
 381         /* Program the command list base and FIS base addresses */
 382         if (readl(port->dd->mmio + HOST_CAP) & HOST_CAP_64) {
 383                 writel((port->command_list_dma >> 16) >> 16,
 384                          port->mmio + PORT_LST_ADDR_HI);
 385                 writel((port->rxfis_dma >> 16) >> 16,
 386                          port->mmio + PORT_FIS_ADDR_HI);
 387                 set_bit(MTIP_PF_HOST_CAP_64, &port->flags);
 388         }
 389
 390         writel(port->command_list_dma & 0xFFFFFFFF,
 391                         port->mmio + PORT_LST_ADDR);
 392         writel(port->rxfis_dma & 0xFFFFFFFF, port->mmio + PORT_FIS_ADDR);
 393
 394         /* Clear SError */
 395         writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);
 396
 397         /* reset the completed registers.*/
 398         for (i = 0; i < port->dd->slot_groups; i++)
 399                 writel(0xFFFFFFFF, port->completed[i]);
 400
 401         /* Clear any pending interrupts for this port */
 402         writel(readl(port->mmio + PORT_IRQ_STAT), port->mmio + PORT_IRQ_STAT);
 403
 404         /* Clear any pending interrupts on the HBA. */
 405         writel(readl(port->dd->mmio + HOST_IRQ_STAT),
 406                                         port->dd->mmio + HOST_IRQ_STAT);
 407
 408         /* Enable port interrupts */
 409         writel(DEF_PORT_IRQ, port->mmio + PORT_IRQ_MASK);
 410 }
 411
 412 /*
 413  * Restart a port
 414  *
 415  * @port Pointer to the port data structure.
 416  *
 417  * return value
 418  *      None
 419  */
 420 static void mtip_restart_port(struct mtip_port *port)
 421 {
 422         unsigned long timeout;
 423
 424         /* Disable the DMA engine */
 425         mtip_enable_engine(port, 0);
 426
 427         /* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */
 428         timeout = jiffies + msecs_to_jiffies(500);
 429         while ((readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON)
 430                  && time_before(jiffies, timeout))
 431                 ;
 432
 433         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 434                 return;
 435
 436         /*
 437          * Chip quirk: escalate to hba reset if
 438          * PxCMD.CR not clear after 500 ms
 439          */
 440         if (readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) {
 441                 dev_warn(&port->dd->pdev->dev,
 442                         "PxCMD.CR not clear, escalating reset\n");
 443
 444                 if (mtip_hba_reset(port->dd))
 445                         dev_err(&port->dd->pdev->dev,
 446                                 "HBA reset escalation failed.\n");
 447
 448                 /* 30 ms delay before com reset to quiesce chip */
 449                 mdelay(30);
 450         }
 451
 452         dev_warn(&port->dd->pdev->dev, "Issuing COM reset\n");
 453
 454         /* Set PxSCTL.DET */
 455         writel(readl(port->mmio + PORT_SCR_CTL) |
 456                          1, port->mmio + PORT_SCR_CTL);
 457         readl(port->mmio + PORT_SCR_CTL);
 458
 459         /* Wait 1 ms to quiesce chip function */
 460         timeout = jiffies + msecs_to_jiffies(1);
 461         while (time_before(jiffies, timeout))
 462                 ;
 463
 464         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 465                 return;
 466
 467         /* Clear PxSCTL.DET */
 468         writel(readl(port->mmio + PORT_SCR_CTL) & ~1,
 469                          port->mmio + PORT_SCR_CTL);
 470         readl(port->mmio + PORT_SCR_CTL);
 471
 472         /* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */
 473         timeout = jiffies + msecs_to_jiffies(500);
 474         while (((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 475                          && time_before(jiffies, timeout))
 476                 ;
 477
 478         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 479                 return;
 480
 481         if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 482                 dev_warn(&port->dd->pdev->dev,
 483                         "COM reset failed\n");
 484
 485         mtip_init_port(port);
 486         mtip_start_port(port);
 487
 488 }
 489
 490 static int mtip_device_reset(struct driver_data *dd)
 491 {
 492         int rv = 0;
 493
 494         if (mtip_check_surprise_removal(dd->pdev))
 495                 return 0;
 496
 497         if (mtip_hba_reset(dd) < 0)
 498                 rv = -EFAULT;
 499
 500         mdelay(1);
 501         mtip_init_port(dd->port);
 502         mtip_start_port(dd->port);
 503
 504         /* Enable interrupts on the HBA. */
 505         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
 506                                         dd->mmio + HOST_CTL);
 507         return rv;
 508 }
 509
 510 /*
 511  * Helper function for tag logging
 512  */
 513 static void print_tags(struct driver_data *dd,
 514                         char *msg,
 515                         unsigned long *tagbits,
 516                         int cnt)
 517 {
 518         unsigned char tagmap[128];
 519         int group, tagmap_len = 0;
 520
 521         memset(tagmap, 0, sizeof(tagmap));
 522         for (group = SLOTBITS_IN_LONGS; group > 0; group--)
 523                 tagmap_len += sprintf(tagmap + tagmap_len, "%016lX ",
 524                                                 tagbits[group-1]);
 525         dev_warn(&dd->pdev->dev,
 526                         "%d command(s) %s: tagmap [%s]", cnt, msg, tagmap);
 527 }
 528
 529 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
 530                                 dma_addr_t buffer_dma, unsigned int sectors);
 531 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
 532                                                 struct smart_attr *attrib);
 533
 534 static void mtip_complete_command(struct mtip_cmd *cmd, blk_status_t status)
 535 {
 536         struct request *req = blk_mq_rq_from_pdu(cmd);
 537
 538         cmd->status = status;
 539         blk_mq_complete_request(req);
 540 }
 541
 542 /*
 543  * Handle an error.
 544  *
 545  * @dd Pointer to the DRIVER_DATA structure.
 546  *
 547  * return value
 548  *      None
 549  */
 550 static void mtip_handle_tfe(struct driver_data *dd)
 551 {
 552         int group, tag, bit, reissue, rv;
 553         struct mtip_port *port;
 554         struct mtip_cmd  *cmd;
 555         u32 completed;
 556         struct host_to_dev_fis *fis;
 557         unsigned long tagaccum[SLOTBITS_IN_LONGS];
 558         unsigned int cmd_cnt = 0;
 559         unsigned char *buf;
 560         char *fail_reason = NULL;
 561         int fail_all_ncq_write = 0, fail_all_ncq_cmds = 0;
 562
 563         dev_warn(&dd->pdev->dev, "Taskfile error\n");
 564
 565         port = dd->port;
 566
 567         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags)) {
 568                 cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 569                 dbg_printk(MTIP_DRV_NAME " TFE for the internal command\n");
 570                 mtip_complete_command(cmd, BLK_STS_IOERR);
 571                 return;
 572         }
 573
 574         /* clear the tag accumulator */
 575         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 576
 577         /* Loop through all the groups */
 578         for (group = 0; group < dd->slot_groups; group++) {
 579                 completed = readl(port->completed[group]);
 580
 581                 dev_warn(&dd->pdev->dev, "g=%u, comp=%x\n", group, completed);
 582
 583                 /* clear completed status register in the hardware.*/
 584                 writel(completed, port->completed[group]);
 585
 586                 /* Process successfully completed commands */
 587                 for (bit = 0; bit < 32 && completed; bit++) {
 588                         if (!(completed & (1<<bit)))
 589                                 continue;
 590                         tag = (group << 5) + bit;
 591
 592                         /* Skip the internal command slot */
 593                         if (tag == MTIP_TAG_INTERNAL)
 594                                 continue;
 595
 596                         cmd = mtip_cmd_from_tag(dd, tag);
 597                         mtip_complete_command(cmd, 0);
 598                         set_bit(tag, tagaccum);
 599                         cmd_cnt++;
 600                 }
 601         }
 602
 603         print_tags(dd, "completed (TFE)", tagaccum, cmd_cnt);
 604
 605         /* Restart the port */
 606         mdelay(20);
 607         mtip_restart_port(port);
 608
 609         /* Trying to determine the cause of the error */
 610         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
 611                                 dd->port->log_buf,
 612                                 dd->port->log_buf_dma, 1);
 613         if (rv) {
 614                 dev_warn(&dd->pdev->dev,
 615                         "Error in READ LOG EXT (10h) command\n");
 616                 /* non-critical error, don't fail the load */
 617         } else {
 618                 buf = (unsigned char *)dd->port->log_buf;
 619                 if (buf[259] & 0x1) {
 620                         dev_info(&dd->pdev->dev,
 621                                 "Write protect bit is set.\n");
 622                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
 623                         fail_all_ncq_write = 1;
 624                         fail_reason = "write protect";
 625                 }
 626                 if (buf[288] == 0xF7) {
 627                         dev_info(&dd->pdev->dev,
 628                                 "Exceeded Tmax, drive in thermal shutdown.\n");
 629                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
 630                         fail_all_ncq_cmds = 1;
 631                         fail_reason = "thermal shutdown";
 632                 }
 633                 if (buf[288] == 0xBF) {
 634                         set_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag);
 635                         dev_info(&dd->pdev->dev,
 636                                 "Drive indicates rebuild has failed. Secure erase required.\n");
 637                         fail_all_ncq_cmds = 1;
 638                         fail_reason = "rebuild failed";
 639                 }
 640         }
 641
 642         /* clear the tag accumulator */
 643         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 644
 645         /* Loop through all the groups */
 646         for (group = 0; group < dd->slot_groups; group++) {
 647                 for (bit = 0; bit < 32; bit++) {
 648                         reissue = 1;
 649                         tag = (group << 5) + bit;
 650                         cmd = mtip_cmd_from_tag(dd, tag);
 651
 652                         fis = (struct host_to_dev_fis *)cmd->command;
 653
 654                         /* Should re-issue? */
 655                         if (tag == MTIP_TAG_INTERNAL ||
 656                             fis->command == ATA_CMD_SET_FEATURES)
 657                                 reissue = 0;
 658                         else {
 659                                 if (fail_all_ncq_cmds ||
 660                                         (fail_all_ncq_write &&
 661                                         fis->command == ATA_CMD_FPDMA_WRITE)) {
 662                                         dev_warn(&dd->pdev->dev,
 663                                         "  Fail: %s w/tag %d [%s].\n",
 664                                         fis->command == ATA_CMD_FPDMA_WRITE ?
 665                                                 "write" : "read",
 666                                         tag,
 667                                         fail_reason != NULL ?
 668                                                 fail_reason : "unknown");
 669                                         mtip_complete_command(cmd, BLK_STS_MEDIUM);
 670                                         continue;
 671                                 }
 672                         }
 673
 674                         /*
 675                          * First check if this command has
 676                          *  exceeded its retries.
 677                          */
 678                         if (reissue && (cmd->retries-- > 0)) {
 679
 680                                 set_bit(tag, tagaccum);
 681
 682                                 /* Re-issue the command. */
 683                                 mtip_issue_ncq_command(port, tag);
 684
 685                                 continue;
 686                         }
 687
 688                         /* Retire a command that will not be reissued */
 689                         dev_warn(&port->dd->pdev->dev,
 690                                 "retiring tag %d\n", tag);
 691
 692                         mtip_complete_command(cmd, BLK_STS_IOERR);
 693                 }
 694         }
 695         print_tags(dd, "reissued (TFE)", tagaccum, cmd_cnt);
 696 }
 697
 698 /*
 699  * Handle a set device bits interrupt
 700  */
 701 static inline void mtip_workq_sdbfx(struct mtip_port *port, int group,
 702                                                         u32 completed)
 703 {
 704         struct driver_data *dd = port->dd;
 705         int tag, bit;
 706         struct mtip_cmd *command;
 707
 708         if (!completed) {
 709                 WARN_ON_ONCE(!completed);
 710                 return;
 711         }
 712         /* clear completed status register in the hardware.*/
 713         writel(completed, port->completed[group]);
 714
 715         /* Process completed commands. */
 716         for (bit = 0; (bit < 32) && completed; bit++) {
 717                 if (completed & 0x01) {
 718                         tag = (group << 5) | bit;
 719
 720                         /* skip internal command slot. */
 721                         if (unlikely(tag == MTIP_TAG_INTERNAL))
 722                                 continue;
 723
 724                         command = mtip_cmd_from_tag(dd, tag);
 725                         mtip_complete_command(command, 0);
 726                 }
 727                 completed >>= 1;
 728         }
 729
 730         /* If last, re-enable interrupts */
 731         if (atomic_dec_return(&dd->irq_workers_active) == 0)
 732                 writel(0xffffffff, dd->mmio + HOST_IRQ_STAT);
 733 }
 734
 735 /*
 736  * Process legacy pio and d2h interrupts
 737  */
 738 static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat)
 739 {
 740         struct mtip_port *port = dd->port;
 741         struct mtip_cmd *cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 742
 743         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) && cmd) {
 744                 int group = MTIP_TAG_INDEX(MTIP_TAG_INTERNAL);
 745                 int status = readl(port->cmd_issue[group]);
 746
 747                 if (!(status & (1 << MTIP_TAG_BIT(MTIP_TAG_INTERNAL))))
 748                         mtip_complete_command(cmd, 0);
 749         }
 750 }
 751
 752 /*
 753  * Demux and handle errors
 754  */
 755 static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat)
 756 {
 757         if (unlikely(port_stat & PORT_IRQ_CONNECT)) {
 758                 dev_warn(&dd->pdev->dev,
 759                         "Clearing PxSERR.DIAG.x\n");
 760                 writel((1 << 26), dd->port->mmio + PORT_SCR_ERR);
 761         }
 762
 763         if (unlikely(port_stat & PORT_IRQ_PHYRDY)) {
 764                 dev_warn(&dd->pdev->dev,
 765                         "Clearing PxSERR.DIAG.n\n");
 766                 writel((1 << 16), dd->port->mmio + PORT_SCR_ERR);
 767         }
 768
 769         if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) {
 770                 dev_warn(&dd->pdev->dev,
 771                         "Port stat errors %x unhandled\n",
 772                         (port_stat & ~PORT_IRQ_HANDLED));
 773                 if (mtip_check_surprise_removal(dd->pdev))
 774                         return;
 775         }
 776         if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR))) {
 777                 set_bit(MTIP_PF_EH_ACTIVE_BIT, &dd->port->flags);
 778                 wake_up_interruptible(&dd->port->svc_wait);
 779         }
 780 }
 781
 782 static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
 783 {
 784         struct driver_data *dd = (struct driver_data *) data;
 785         struct mtip_port *port = dd->port;
 786         u32 hba_stat, port_stat;
 787         int rv = IRQ_NONE;
 788         int do_irq_enable = 1, i, workers;
 789         struct mtip_work *twork;
 790
 791         hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
 792         if (hba_stat) {
 793                 rv = IRQ_HANDLED;
 794
 795                 /* Acknowledge the interrupt status on the port.*/
 796                 port_stat = readl(port->mmio + PORT_IRQ_STAT);
 797                 if (unlikely(port_stat == 0xFFFFFFFF)) {
 798                         mtip_check_surprise_removal(dd->pdev);
 799                         return IRQ_HANDLED;
 800                 }
 801                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
 802
 803                 /* Demux port status */
 804                 if (likely(port_stat & PORT_IRQ_SDB_FIS)) {
 805                         do_irq_enable = 0;
 806                         WARN_ON_ONCE(atomic_read(&dd->irq_workers_active) != 0);
 807
 808                         /* Start at 1: group zero is always local? */
 809                         for (i = 0, workers = 0; i < MTIP_MAX_SLOT_GROUPS;
 810                                                                         i++) {
 811                                 twork = &dd->work[i];
 812                                 twork->completed = readl(port->completed[i]);
 813                                 if (twork->completed)
 814                                         workers++;
 815                         }
 816
 817                         atomic_set(&dd->irq_workers_active, workers);
 818                         if (workers) {
 819                                 for (i = 1; i < MTIP_MAX_SLOT_GROUPS; i++) {
 820                                         twork = &dd->work[i];
 821                                         if (twork->completed)
 822                                                 queue_work_on(
 823                                                         twork->cpu_binding,
 824                                                         dd->isr_workq,
 825                                                         &twork->work);
 826                                 }
 827
 828                                 if (likely(dd->work[0].completed))
 829                                         mtip_workq_sdbfx(port, 0,
 830                                                         dd->work[0].completed);
 831
 832                         } else {
 833                                 /*
 834                                  * Chip quirk: SDB interrupt but nothing
 835                                  * to complete
 836                                  */
 837                                 do_irq_enable = 1;
 838                         }
 839                 }
 840
 841                 if (unlikely(port_stat & PORT_IRQ_ERR)) {
 842                         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
 843                                 /* don't proceed further */
 844                                 return IRQ_HANDLED;
 845                         }
 846                         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
 847                                                         &dd->dd_flag))
 848                                 return rv;
 849
 850                         mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
 851                 }
 852
 853                 if (unlikely(port_stat & PORT_IRQ_LEGACY))
 854                         mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY);
 855         }
 856
 857         /* acknowledge interrupt */
 858         if (unlikely(do_irq_enable))
 859                 writel(hba_stat, dd->mmio + HOST_IRQ_STAT);
 860
 861         return rv;
 862 }
 863
 864 /*
 865  * HBA interrupt subroutine.
 866  *
 867  * @irq         IRQ number.
 868  * @instance    Pointer to the driver data structure.
 869  *
 870  * return value
 871  *      IRQ_HANDLED     A HBA interrupt was pending and handled.
 872  *      IRQ_NONE        This interrupt was not for the HBA.
 873  */
 874 static irqreturn_t mtip_irq_handler(int irq, void *instance)
 875 {
 876         struct driver_data *dd = instance;
 877
 878         return mtip_handle_irq(dd);
 879 }
 880
 881 static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
 882 {
 883         writel(1 << MTIP_TAG_BIT(tag), port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 884 }
 885
 886 static bool mtip_pause_ncq(struct mtip_port *port,
 887                                 struct host_to_dev_fis *fis)
 888 {
 889         unsigned long task_file_data;
 890
 891         task_file_data = readl(port->mmio+PORT_TFDATA);
 892         if ((task_file_data & 1))
 893                 return false;
 894
 895         if (fis->command == ATA_CMD_SEC_ERASE_PREP) {
 896                 port->ic_pause_timer = jiffies;
 897                 return true;
 898         } else if ((fis->command == ATA_CMD_DOWNLOAD_MICRO) &&
 899                                         (fis->features == 0x03)) {
 900                 set_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
 901                 port->ic_pause_timer = jiffies;
 902                 return true;
 903         } else if ((fis->command == ATA_CMD_SEC_ERASE_UNIT) ||
 904                 ((fis->command == 0xFC) &&
 905                         (fis->features == 0x27 || fis->features == 0x72 ||
 906                          fis->features == 0x62 || fis->features == 0x26))) {
 907                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
 908                 clear_bit(MTIP_DDF_REBUILD_FAILED_BIT, &port->dd->dd_flag);
 909                 /* Com reset after secure erase or lowlevel format */
 910                 mtip_restart_port(port);
 911                 clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
 912                 return false;
 913         }
 914
 915         return false;
 916 }
 917
 918 static bool mtip_commands_active(struct mtip_port *port)
 919 {
 920         unsigned int active;
 921         unsigned int n;
 922
 923         /*
 924          * Ignore s_active bit 0 of array element 0.
 925          * This bit will always be set
 926          */
 927         active = readl(port->s_active[0]) & 0xFFFFFFFE;
 928         for (n = 1; n < port->dd->slot_groups; n++)
 929                 active |= readl(port->s_active[n]);
 930
 931         return active != 0;
 932 }
 933
 934 /*
 935  * Wait for port to quiesce
 936  *
 937  * @port    Pointer to port data structure
 938  * @timeout Max duration to wait (ms)
 939  *
 940  * return value
 941  *      0       Success
 942  *      -EBUSY  Commands still active
 943  */
 944 static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
 945 {
 946         unsigned long to;
 947         bool active = true;
 948
 949         blk_mq_quiesce_queue(port->dd->queue);
 950
 951         to = jiffies + msecs_to_jiffies(timeout);
 952         do {
 953                 if (test_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags) &&
 954                         test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
 955                         msleep(20);
 956                         continue; /* svc thd is actively issuing commands */
 957                 }
 958
 959                 msleep(100);
 960
 961                 if (mtip_check_surprise_removal(port->dd->pdev))
 962                         goto err_fault;
 963
 964                 active = mtip_commands_active(port);
 965                 if (!active)
 966                         break;
 967         } while (time_before(jiffies, to));
 968
 969         blk_mq_unquiesce_queue(port->dd->queue);
 970         return active ? -EBUSY : 0;
 971 err_fault:
 972         blk_mq_unquiesce_queue(port->dd->queue);
 973         return -EFAULT;
 974 }
 975
 976 struct mtip_int_cmd {
 977         int fis_len;
 978         dma_addr_t buffer;
 979         int buf_len;
 980         u32 opts;
 981 };
 982
 983 /*
 984  * Execute an internal command and wait for the completion.
 985  *
 986  * @port    Pointer to the port data structure.
 987  * @fis     Pointer to the FIS that describes the command.
 988  * @fis_len  Length in WORDS of the FIS.
 989  * @buffer  DMA accessible for command data.
 990  * @buf_len  Length, in bytes, of the data buffer.
 991  * @opts    Command header options, excluding the FIS length
 992  *             and the number of PRD entries.
 993  * @timeout Time in ms to wait for the command to complete.
 994  *
 995  * return value
 996  *      0        Command completed successfully.
 997  *      -EFAULT  The buffer address is not correctly aligned.
 998  *      -EBUSY   Internal command or other IO in progress.
 999  *      -EAGAIN  Time out waiting for command to complete.
1000  */
1001 static int mtip_exec_internal_command(struct mtip_port *port,
1002                                         struct host_to_dev_fis *fis,
1003                                         int fis_len,
1004                                         dma_addr_t buffer,
1005                                         int buf_len,
1006                                         u32 opts,
1007                                         unsigned long timeout)
1008 {
1009         struct mtip_cmd *int_cmd;
1010         struct driver_data *dd = port->dd;
1011         struct request *rq;
1012         struct mtip_int_cmd icmd = {
1013                 .fis_len = fis_len,
1014                 .buffer = buffer,
1015                 .buf_len = buf_len,
1016                 .opts = opts
1017         };
1018         int rv = 0;
1019
1020         /* Make sure the buffer is 8 byte aligned. This is asic specific. */
1021         if (buffer & 0x00000007) {
1022                 dev_err(&dd->pdev->dev, "SG buffer is not 8 byte aligned\n");
1023                 return -EFAULT;
1024         }
1025
1026         int_cmd = mtip_get_int_command(dd);
1027         if (!int_cmd) {
1028                 dbg_printk(MTIP_DRV_NAME "Unable to allocate tag for PIO cmd\n");
1029                 return -EFAULT;
1030         }
1031         rq = blk_mq_rq_from_pdu(int_cmd);
1032         rq->special = &icmd;
1033
1034         set_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1035
1036         if (fis->command == ATA_CMD_SEC_ERASE_PREP)
1037                 set_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1038
1039         clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1040
1041         if (fis->command != ATA_CMD_STANDBYNOW1) {
1042                 /* wait for io to complete if non atomic */
1043                 if (mtip_quiesce_io(port, MTIP_QUIESCE_IO_TIMEOUT_MS) < 0) {
1044                         dev_warn(&dd->pdev->dev, "Failed to quiesce IO\n");
1045                         blk_mq_free_request(rq);
1046                         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1047                         wake_up_interruptible(&port->svc_wait);
1048                         return -EBUSY;
1049                 }
1050         }
1051
1052         /* Copy the command to the command table */
1053         memcpy(int_cmd->command, fis, fis_len*4);
1054
1055         rq->timeout = timeout;
1056
1057         /* insert request and run queue */
1058         blk_execute_rq(rq->q, NULL, rq, true);
1059
1060         if (int_cmd->status) {
1061                 dev_err(&dd->pdev->dev, "Internal command [%02X] failed %d\n",
1062                                 fis->command, int_cmd->status);
1063                 rv = -EIO;
1064
1065                 if (mtip_check_surprise_removal(dd->pdev) ||
1066                         test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1067                                         &dd->dd_flag)) {
1068                         dev_err(&dd->pdev->dev,
1069                                 "Internal command [%02X] wait returned due to SR\n",
1070                                 fis->command);
1071                         rv = -ENXIO;
1072                         goto exec_ic_exit;
1073                 }
1074                 mtip_device_reset(dd); /* recover from timeout issue */
1075                 rv = -EAGAIN;
1076                 goto exec_ic_exit;
1077         }
1078
1079         if (readl(port->cmd_issue[MTIP_TAG_INDEX(MTIP_TAG_INTERNAL)])
1080                         & (1 << MTIP_TAG_BIT(MTIP_TAG_INTERNAL))) {
1081                 rv = -ENXIO;
1082                 if (!test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
1083                         mtip_device_reset(dd);
1084                         rv = -EAGAIN;
1085                 }
1086         }
1087 exec_ic_exit:
1088         /* Clear the allocated and active bits for the internal command. */
1089         blk_mq_free_request(rq);
1090         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1091         if (rv >= 0 && mtip_pause_ncq(port, fis)) {
1092                 /* NCQ paused */
1093                 return rv;
1094         }
1095         wake_up_interruptible(&port->svc_wait);
1096
1097         return rv;
1098 }
1099
1100 /*
1101  * Byte-swap ATA ID strings.
1102  *
1103  * ATA identify data contains strings in byte-swapped 16-bit words.
1104  * They must be swapped (on all architectures) to be usable as C strings.
1105  * This function swaps bytes in-place.
1106  *
1107  * @buf The buffer location of the string
1108  * @len The number of bytes to swap
1109  *
1110  * return value
1111  *      None
1112  */
1113 static inline void ata_swap_string(u16 *buf, unsigned int len)
1114 {
1115         int i;
1116         for (i = 0; i < (len/2); i++)
1117                 be16_to_cpus(&buf[i]);
1118 }
1119
1120 static void mtip_set_timeout(struct driver_data *dd,
1121                                         struct host_to_dev_fis *fis,
1122                                         unsigned int *timeout, u8 erasemode)
1123 {
1124         switch (fis->command) {
1125         case ATA_CMD_DOWNLOAD_MICRO:
1126                 *timeout = 120000; /* 2 minutes */
1127                 break;
1128         case ATA_CMD_SEC_ERASE_UNIT:
1129         case 0xFC:
1130                 if (erasemode)
1131                         *timeout = ((*(dd->port->identify + 90) * 2) * 60000);
1132                 else
1133                         *timeout = ((*(dd->port->identify + 89) * 2) * 60000);
1134                 break;
1135         case ATA_CMD_STANDBYNOW1:
1136                 *timeout = 120000;  /* 2 minutes */
1137                 break;
1138         case 0xF7:
1139         case 0xFA:
1140                 *timeout = 60000;  /* 60 seconds */
1141                 break;
1142         case ATA_CMD_SMART:
1143                 *timeout = 15000;  /* 15 seconds */
1144                 break;
1145         default:
1146                 *timeout = MTIP_IOCTL_CMD_TIMEOUT_MS;
1147                 break;
1148         }
1149 }
1150
1151 /*
1152  * Request the device identity information.
1153  *
1154  * If a user space buffer is not specified, i.e. is NULL, the
1155  * identify information is still read from the drive and placed
1156  * into the identify data buffer (@e port->identify) in the
1157  * port data structure.
1158  * When the identify buffer contains valid identify information @e
1159  * port->identify_valid is non-zero.
1160  *
1161  * @port         Pointer to the port structure.
1162  * @user_buffer  A user space buffer where the identify data should be
1163  *                    copied.
1164  *
1165  * return value
1166  *      0       Command completed successfully.
1167  *      -EFAULT An error occurred while coping data to the user buffer.
1168  *      -1      Command failed.
1169  */
1170 static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
1171 {
1172         int rv = 0;
1173         struct host_to_dev_fis fis;
1174
1175         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1176                 return -EFAULT;
1177
1178         /* Build the FIS. */
1179         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1180         fis.type        = 0x27;
1181         fis.opts        = 1 << 7;
1182         fis.command     = ATA_CMD_ID_ATA;
1183
1184         /* Set the identify information as invalid. */
1185         port->identify_valid = 0;
1186
1187         /* Clear the identify information. */
1188         memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);
1189
1190         /* Execute the command. */
1191         if (mtip_exec_internal_command(port,
1192                                 &fis,
1193                                 5,
1194                                 port->identify_dma,
1195                                 sizeof(u16) * ATA_ID_WORDS,
1196                                 0,
1197                                 MTIP_INT_CMD_TIMEOUT_MS)
1198                                 < 0) {
1199                 rv = -1;
1200                 goto out;
1201         }
1202
1203         /*
1204          * Perform any necessary byte-swapping.  Yes, the kernel does in fact
1205          * perform field-sensitive swapping on the string fields.
1206          * See the kernel use of ata_id_string() for proof of this.
1207          */
1208 #ifdef __LITTLE_ENDIAN
1209         ata_swap_string(port->identify + 27, 40);  /* model string*/
1210         ata_swap_string(port->identify + 23, 8);   /* firmware string*/
1211         ata_swap_string(port->identify + 10, 20);  /* serial# string*/
1212 #else
1213         {
1214                 int i;
1215                 for (i = 0; i < ATA_ID_WORDS; i++)
1216                         port->identify[i] = le16_to_cpu(port->identify[i]);
1217         }
1218 #endif
1219
1220         /* Check security locked state */
1221         if (port->identify[128] & 0x4)
1222                 set_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1223         else
1224                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1225
1226 #ifdef MTIP_TRIM /* Disabling TRIM support temporarily */
1227         /* Demux ID.DRAT & ID.RZAT to determine trim support */
1228         if (port->identify[69] & (1 << 14) && port->identify[69] & (1 << 5))
1229                 port->dd->trim_supp = true;
1230         else
1231 #endif
1232                 port->dd->trim_supp = false;
1233
1234         /* Set the identify buffer as valid. */
1235         port->identify_valid = 1;
1236
1237         if (user_buffer) {
1238                 if (copy_to_user(
1239                         user_buffer,
1240                         port->identify,
1241                         ATA_ID_WORDS * sizeof(u16))) {
1242                         rv = -EFAULT;
1243                         goto out;
1244                 }
1245         }
1246
1247 out:
1248         return rv;
1249 }
1250
1251 /*
1252  * Issue a standby immediate command to the device.
1253  *
1254  * @port Pointer to the port structure.
1255  *
1256  * return value
1257  *      0       Command was executed successfully.
1258  *      -1      An error occurred while executing the command.
1259  */
1260 static int mtip_standby_immediate(struct mtip_port *port)
1261 {
1262         int rv;
1263         struct host_to_dev_fis  fis;
1264         unsigned long start;
1265         unsigned int timeout;
1266
1267         /* Build the FIS. */
1268         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1269         fis.type        = 0x27;
1270         fis.opts        = 1 << 7;
1271         fis.command     = ATA_CMD_STANDBYNOW1;
1272
1273         mtip_set_timeout(port->dd, &fis, &timeout, 0);
1274
1275         start = jiffies;
1276         rv = mtip_exec_internal_command(port,
1277                                         &fis,
1278                                         5,
1279                                         0,
1280                                         0,
1281                                         0,
1282                                         timeout);
1283         dbg_printk(MTIP_DRV_NAME "Time taken to complete standby cmd: %d ms\n",
1284                         jiffies_to_msecs(jiffies - start));
1285         if (rv)
1286                 dev_warn(&port->dd->pdev->dev,
1287                         "STANDBY IMMEDIATE command failed.\n");
1288
1289         return rv;
1290 }
1291
1292 /*
1293  * Issue a READ LOG EXT command to the device.
1294  *
1295  * @port        pointer to the port structure.
1296  * @page        page number to fetch
1297  * @buffer      pointer to buffer
1298  * @buffer_dma  dma address corresponding to @buffer
1299  * @sectors     page length to fetch, in sectors
1300  *
1301  * return value
1302  *      @rv     return value from mtip_exec_internal_command()
1303  */
1304 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
1305                                 dma_addr_t buffer_dma, unsigned int sectors)
1306 {
1307         struct host_to_dev_fis fis;
1308
1309         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1310         fis.type        = 0x27;
1311         fis.opts        = 1 << 7;
1312         fis.command     = ATA_CMD_READ_LOG_EXT;
1313         fis.sect_count  = sectors & 0xFF;
1314         fis.sect_cnt_ex = (sectors >> 8) & 0xFF;
1315         fis.lba_low     = page;
1316         fis.lba_mid     = 0;
1317         fis.device      = ATA_DEVICE_OBS;
1318
1319         memset(buffer, 0, sectors * ATA_SECT_SIZE);
1320
1321         return mtip_exec_internal_command(port,
1322                                         &fis,
1323                                         5,
1324                                         buffer_dma,
1325                                         sectors * ATA_SECT_SIZE,
1326                                         0,
1327                                         MTIP_INT_CMD_TIMEOUT_MS);
1328 }
1329
1330 /*
1331  * Issue a SMART READ DATA command to the device.
1332  *
1333  * @port        pointer to the port structure.
1334  * @buffer      pointer to buffer
1335  * @buffer_dma  dma address corresponding to @buffer
1336  *
1337  * return value
1338  *      @rv     return value from mtip_exec_internal_command()
1339  */
1340 static int mtip_get_smart_data(struct mtip_port *port, u8 *buffer,
1341                                         dma_addr_t buffer_dma)
1342 {
1343         struct host_to_dev_fis fis;
1344
1345         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1346         fis.type        = 0x27;
1347         fis.opts        = 1 << 7;
1348         fis.command     = ATA_CMD_SMART;
1349         fis.features    = 0xD0;
1350         fis.sect_count  = 1;
1351         fis.lba_mid     = 0x4F;
1352         fis.lba_hi      = 0xC2;
1353         fis.device      = ATA_DEVICE_OBS;
1354
1355         return mtip_exec_internal_command(port,
1356                                         &fis,
1357                                         5,
1358                                         buffer_dma,
1359                                         ATA_SECT_SIZE,
1360                                         0,
1361                                         15000);
1362 }
1363
1364 /*
1365  * Get the value of a smart attribute
1366  *
1367  * @port        pointer to the port structure
1368  * @id          attribute number
1369  * @attrib      pointer to return attrib information corresponding to @id
1370  *
1371  * return value
1372  *      -EINVAL NULL buffer passed or unsupported attribute @id.
1373  *      -EPERM  Identify data not valid, SMART not supported or not enabled
1374  */
1375 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
1376                                                 struct smart_attr *attrib)
1377 {
1378         int rv, i;
1379         struct smart_attr *pattr;
1380
1381         if (!attrib)
1382                 return -EINVAL;
1383
1384         if (!port->identify_valid) {
1385                 dev_warn(&port->dd->pdev->dev, "IDENTIFY DATA not valid\n");
1386                 return -EPERM;
1387         }
1388         if (!(port->identify[82] & 0x1)) {
1389                 dev_warn(&port->dd->pdev->dev, "SMART not supported\n");
1390                 return -EPERM;
1391         }
1392         if (!(port->identify[85] & 0x1)) {
1393                 dev_warn(&port->dd->pdev->dev, "SMART not enabled\n");
1394                 return -EPERM;
1395         }
1396
1397         memset(port->smart_buf, 0, ATA_SECT_SIZE);
1398         rv = mtip_get_smart_data(port, port->smart_buf, port->smart_buf_dma);
1399         if (rv) {
1400                 dev_warn(&port->dd->pdev->dev, "Failed to ge SMART data\n");
1401                 return rv;
1402         }
1403
1404         pattr = (struct smart_attr *)(port->smart_buf + 2);
1405         for (i = 0; i < 29; i++, pattr++)
1406                 if (pattr->attr_id == id) {
1407                         memcpy(attrib, pattr, sizeof(struct smart_attr));
1408                         break;
1409                 }
1410
1411         if (i == 29) {
1412                 dev_warn(&port->dd->pdev->dev,
1413                         "Query for invalid SMART attribute ID\n");
1414                 rv = -EINVAL;
1415         }
1416
1417         return rv;
1418 }
1419
1420 /*
1421  * Trim unused sectors
1422  *
1423  * @dd          pointer to driver_data structure
1424  * @lba         starting lba
1425  * @len         # of 512b sectors to trim
1426  *
1427  * return value
1428  *      -ENOMEM         Out of dma memory
1429  *      -EINVAL         Invalid parameters passed in, trim not supported
1430  *      -EIO            Error submitting trim request to hw
1431  */
1432 static int mtip_send_trim(struct driver_data *dd, unsigned int lba,
1433                                 unsigned int len)
1434 {
1435         int i, rv = 0;
1436         u64 tlba, tlen, sect_left;
1437         struct mtip_trim_entry *buf;
1438         dma_addr_t dma_addr;
1439         struct host_to_dev_fis fis;
1440
1441         if (!len || dd->trim_supp == false)
1442                 return -EINVAL;
1443
1444         /* Trim request too big */
1445         WARN_ON(len > (MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES));
1446
1447         /* Trim request not aligned on 4k boundary */
1448         WARN_ON(len % 8 != 0);
1449
1450         /* Warn if vu_trim structure is too big */
1451         WARN_ON(sizeof(struct mtip_trim) > ATA_SECT_SIZE);
1452
1453         /* Allocate a DMA buffer for the trim structure */
1454         buf = dmam_alloc_coherent(&dd->pdev->dev, ATA_SECT_SIZE, &dma_addr,
1455                                                                 GFP_KERNEL);
1456         if (!buf)
1457                 return -ENOMEM;
1458         memset(buf, 0, ATA_SECT_SIZE);
1459
1460         for (i = 0, sect_left = len, tlba = lba;
1461                         i < MTIP_MAX_TRIM_ENTRIES && sect_left;
1462                         i++) {
1463                 tlen = (sect_left >= MTIP_MAX_TRIM_ENTRY_LEN ?
1464                                         MTIP_MAX_TRIM_ENTRY_LEN :
1465                                         sect_left);
1466                 buf[i].lba = __force_bit2int cpu_to_le32(tlba);
1467                 buf[i].range = __force_bit2int cpu_to_le16(tlen);
1468                 tlba += tlen;
1469                 sect_left -= tlen;
1470         }
1471         WARN_ON(sect_left != 0);
1472
1473         /* Build the fis */
1474         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1475         fis.type       = 0x27;
1476         fis.opts       = 1 << 7;
1477         fis.command    = 0xfb;
1478         fis.features   = 0x60;
1479         fis.sect_count = 1;
1480         fis.device     = ATA_DEVICE_OBS;
1481
1482         if (mtip_exec_internal_command(dd->port,
1483                                         &fis,
1484                                         5,
1485                                         dma_addr,
1486                                         ATA_SECT_SIZE,
1487                                         0,
1488                                         MTIP_TRIM_TIMEOUT_MS) < 0)
1489                 rv = -EIO;
1490
1491         dmam_free_coherent(&dd->pdev->dev, ATA_SECT_SIZE, buf, dma_addr);
1492         return rv;
1493 }
1494
1495 /*
1496  * Get the drive capacity.
1497  *
1498  * @dd      Pointer to the device data structure.
1499  * @sectors Pointer to the variable that will receive the sector count.
1500  *
1501  * return value
1502  *      1 Capacity was returned successfully.
1503  *      0 The identify information is invalid.
1504  */
1505 static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
1506 {
1507         struct mtip_port *port = dd->port;
1508         u64 total, raw0, raw1, raw2, raw3;
1509         raw0 = port->identify[100];
1510         raw1 = port->identify[101];
1511         raw2 = port->identify[102];
1512         raw3 = port->identify[103];
1513         total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
1514         *sectors = total;
1515         return (bool) !!port->identify_valid;
1516 }
1517
1518 /*
1519  * Display the identify command data.
1520  *
1521  * @port Pointer to the port data structure.
1522  *
1523  * return value
1524  *      None
1525  */
1526 static void mtip_dump_identify(struct mtip_port *port)
1527 {
1528         sector_t sectors;
1529         unsigned short revid;
1530         char cbuf[42];
1531
1532         if (!port->identify_valid)
1533                 return;
1534
1535         strlcpy(cbuf, (char *)(port->identify+10), 21);
1536         dev_info(&port->dd->pdev->dev,
1537                 "Serial No.: %s\n", cbuf);
1538
1539         strlcpy(cbuf, (char *)(port->identify+23), 9);
1540         dev_info(&port->dd->pdev->dev,
1541                 "Firmware Ver.: %s\n", cbuf);
1542
1543         strlcpy(cbuf, (char *)(port->identify+27), 41);
1544         dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);
1545
1546         dev_info(&port->dd->pdev->dev, "Security: %04x %s\n",
1547                 port->identify[128],
1548                 port->identify[128] & 0x4 ? "(LOCKED)" : "");
1549
1550         if (mtip_hw_get_capacity(port->dd, &sectors))
1551                 dev_info(&port->dd->pdev->dev,
1552                         "Capacity: %llu sectors (%llu MB)\n",
1553                          (u64)sectors,
1554                          ((u64)sectors) * ATA_SECT_SIZE >> 20);
1555
1556         pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
1557         switch (revid & 0xFF) {
1558         case 0x1:
1559                 strlcpy(cbuf, "A0", 3);
1560                 break;
1561         case 0x3:
1562                 strlcpy(cbuf, "A2", 3);
1563                 break;
1564         default:
1565                 strlcpy(cbuf, "?", 2);
1566                 break;
1567         }
1568         dev_info(&port->dd->pdev->dev,
1569                 "Card Type: %s\n", cbuf);
1570 }
1571
1572 /*
1573  * Map the commands scatter list into the command table.
1574  *
1575  * @command Pointer to the command.
1576  * @nents Number of scatter list entries.
1577  *
1578  * return value
1579  *      None
1580  */
1581 static inline void fill_command_sg(struct driver_data *dd,
1582                                 struct mtip_cmd *command,
1583                                 int nents)
1584 {
1585         int n;
1586         unsigned int dma_len;
1587         struct mtip_cmd_sg *command_sg;
1588         struct scatterlist *sg = command->sg;
1589
1590         command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
1591
1592         for (n = 0; n < nents; n++) {
1593                 dma_len = sg_dma_len(sg);
1594                 if (dma_len > 0x400000)
1595                         dev_err(&dd->pdev->dev,
1596                                 "DMA segment length truncated\n");
1597                 command_sg->info = __force_bit2int
1598                         cpu_to_le32((dma_len-1) & 0x3FFFFF);
1599                 command_sg->dba = __force_bit2int
1600                         cpu_to_le32(sg_dma_address(sg));
1601                 command_sg->dba_upper = __force_bit2int
1602                         cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
1603                 command_sg++;
1604                 sg++;
1605         }
1606 }
1607
1608 /*
1609  * @brief Execute a drive command.
1610  *
1611  * return value 0 The command completed successfully.
1612  * return value -1 An error occurred while executing the command.
1613  */
1614 static int exec_drive_task(struct mtip_port *port, u8 *command)
1615 {
1616         struct host_to_dev_fis  fis;
1617         struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
1618         unsigned int to;
1619
1620         /* Build the FIS. */
1621         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1622         fis.type        = 0x27;
1623         fis.opts        = 1 << 7;
1624         fis.command     = command[0];
1625         fis.features    = command[1];
1626         fis.sect_count  = command[2];
1627         fis.sector      = command[3];
1628         fis.cyl_low     = command[4];
1629         fis.cyl_hi      = command[5];
1630         fis.device      = command[6] & ~0x10; /* Clear the dev bit*/
1631
1632         mtip_set_timeout(port->dd, &fis, &to, 0);
1633
1634         dbg_printk(MTIP_DRV_NAME " %s: User Command: cmd %x, feat %x, nsect %x, sect %x, lcyl %x, hcyl %x, sel %x\n",
1635                 __func__,
1636                 command[0],
1637                 command[1],
1638                 command[2],
1639                 command[3],
1640                 command[4],
1641                 command[5],
1642                 command[6]);
1643
1644         /* Execute the command. */
1645         if (mtip_exec_internal_command(port,
1646                                  &fis,
1647                                  5,
1648                                  0,
1649                                  0,
1650                                  0,
1651                                  to) < 0) {
1652                 return -1;
1653         }
1654
1655         command[0] = reply->command; /* Status*/
1656         command[1] = reply->features; /* Error*/
1657         command[4] = reply->cyl_low;
1658         command[5] = reply->cyl_hi;
1659
1660         dbg_printk(MTIP_DRV_NAME " %s: Completion Status: stat %x, err %x , cyl_lo %x cyl_hi %x\n",
1661                 __func__,
1662                 command[0],
1663                 command[1],
1664                 command[4],
1665                 command[5]);
1666
1667         return 0;
1668 }
1669
1670 /*
1671  * @brief Execute a drive command.
1672  *
1673  * @param port Pointer to the port data structure.
1674  * @param command Pointer to the user specified command parameters.
1675  * @param user_buffer Pointer to the user space buffer where read sector
1676  *                   data should be copied.
1677  *
1678  * return value 0 The command completed successfully.
1679  * return value -EFAULT An error occurred while copying the completion
1680  *                 data to the user space buffer.
1681  * return value -1 An error occurred while executing the command.
1682  */
1683 static int exec_drive_command(struct mtip_port *port, u8 *command,
1684                                 void __user *user_buffer)
1685 {
1686         struct host_to_dev_fis  fis;
1687         struct host_to_dev_fis *reply;
1688         u8 *buf = NULL;
1689         dma_addr_t dma_addr = 0;
1690         int rv = 0, xfer_sz = command[3];
1691         unsigned int to;
1692
1693         if (xfer_sz) {
1694                 if (!user_buffer)
1695                         return -EFAULT;
1696
1697                 buf = dmam_alloc_coherent(&port->dd->pdev->dev,
1698                                 ATA_SECT_SIZE * xfer_sz,
1699                                 &dma_addr,
1700                                 GFP_KERNEL);
1701                 if (!buf) {
1702                         dev_err(&port->dd->pdev->dev,
1703                                 "Memory allocation failed (%d bytes)\n",
1704                                 ATA_SECT_SIZE * xfer_sz);
1705                         return -ENOMEM;
1706                 }
1707                 memset(buf, 0, ATA_SECT_SIZE * xfer_sz);
1708         }
1709
1710         /* Build the FIS. */
1711         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1712         fis.type        = 0x27;
1713         fis.opts        = 1 << 7;
1714         fis.command     = command[0];
1715         fis.features    = command[2];
1716         fis.sect_count  = command[3];
1717         if (fis.command == ATA_CMD_SMART) {
1718                 fis.sector      = command[1];
1719                 fis.cyl_low     = 0x4F;
1720                 fis.cyl_hi      = 0xC2;
1721         }
1722
1723         mtip_set_timeout(port->dd, &fis, &to, 0);
1724
1725         if (xfer_sz)
1726                 reply = (port->rxfis + RX_FIS_PIO_SETUP);
1727         else
1728                 reply = (port->rxfis + RX_FIS_D2H_REG);
1729
1730         dbg_printk(MTIP_DRV_NAME
1731                 " %s: User Command: cmd %x, sect %x, "
1732                 "feat %x, sectcnt %x\n",
1733                 __func__,
1734                 command[0],
1735                 command[1],
1736                 command[2],
1737                 command[3]);
1738
1739         /* Execute the command. */
1740         if (mtip_exec_internal_command(port,
1741                                 &fis,
1742                                  5,
1743                                  (xfer_sz ? dma_addr : 0),
1744                                  (xfer_sz ? ATA_SECT_SIZE * xfer_sz : 0),
1745                                  0,
1746                                  to)
1747                                  < 0) {
1748                 rv = -EFAULT;
1749                 goto exit_drive_command;
1750         }
1751
1752         /* Collect the completion status. */
1753         command[0] = reply->command; /* Status*/
1754         command[1] = reply->features; /* Error*/
1755         command[2] = reply->sect_count;
1756
1757         dbg_printk(MTIP_DRV_NAME
1758                 " %s: Completion Status: stat %x, "
1759                 "err %x, nsect %x\n",
1760                 __func__,
1761                 command[0],
1762                 command[1],
1763                 command[2]);
1764
1765         if (xfer_sz) {
1766                 if (copy_to_user(user_buffer,
1767                                  buf,
1768                                  ATA_SECT_SIZE * command[3])) {
1769                         rv = -EFAULT;
1770                         goto exit_drive_command;
1771                 }
1772         }
1773 exit_drive_command:
1774         if (buf)
1775                 dmam_free_coherent(&port->dd->pdev->dev,
1776                                 ATA_SECT_SIZE * xfer_sz, buf, dma_addr);
1777         return rv;
1778 }
1779
1780 /*
1781  *  Indicates whether a command has a single sector payload.
1782  *
1783  *  @command passed to the device to perform the certain event.
1784  *  @features passed to the device to perform the certain event.
1785  *
1786  *  return value
1787  *      1       command is one that always has a single sector payload,
1788  *              regardless of the value in the Sector Count field.
1789  *      0       otherwise
1790  *
1791  */
1792 static unsigned int implicit_sector(unsigned char command,
1793                                     unsigned char features)
1794 {
1795         unsigned int rv = 0;
1796
1797         /* list of commands that have an implicit sector count of 1 */
1798         switch (command) {
1799         case ATA_CMD_SEC_SET_PASS:
1800         case ATA_CMD_SEC_UNLOCK:
1801         case ATA_CMD_SEC_ERASE_PREP:
1802         case ATA_CMD_SEC_ERASE_UNIT:
1803         case ATA_CMD_SEC_FREEZE_LOCK:
1804         case ATA_CMD_SEC_DISABLE_PASS:
1805         case ATA_CMD_PMP_READ:
1806         case ATA_CMD_PMP_WRITE:
1807                 rv = 1;
1808                 break;
1809         case ATA_CMD_SET_MAX:
1810                 if (features == ATA_SET_MAX_UNLOCK)
1811                         rv = 1;
1812                 break;
1813         case ATA_CMD_SMART:
1814                 if ((features == ATA_SMART_READ_VALUES) ||
1815                                 (features == ATA_SMART_READ_THRESHOLDS))
1816                         rv = 1;
1817                 break;
1818         case ATA_CMD_CONF_OVERLAY:
1819                 if ((features == ATA_DCO_IDENTIFY) ||
1820                                 (features == ATA_DCO_SET))
1821                         rv = 1;
1822                 break;
1823         }
1824         return rv;
1825 }
1826
1827 /*
1828  * Executes a taskfile
1829  * See ide_taskfile_ioctl() for derivation
1830  */
1831 static int exec_drive_taskfile(struct driver_data *dd,
1832                                void __user *buf,
1833                                ide_task_request_t *req_task,
1834                                int outtotal)
1835 {
1836         struct host_to_dev_fis  fis;
1837         struct host_to_dev_fis *reply;
1838         u8 *outbuf = NULL;
1839         u8 *inbuf = NULL;
1840         dma_addr_t outbuf_dma = 0;
1841         dma_addr_t inbuf_dma = 0;
1842         dma_addr_t dma_buffer = 0;
1843         int err = 0;
1844         unsigned int taskin = 0;
1845         unsigned int taskout = 0;
1846         u8 nsect = 0;
1847         unsigned int timeout;
1848         unsigned int force_single_sector;
1849         unsigned int transfer_size;
1850         unsigned long task_file_data;
1851         int intotal = outtotal + req_task->out_size;
1852         int erasemode = 0;
1853
1854         taskout = req_task->out_size;
1855         taskin = req_task->in_size;
1856         /* 130560 = 512 * 0xFF*/
1857         if (taskin > 130560 || taskout > 130560)
1858                 return -EINVAL;
1859
1860         if (taskout) {
1861                 outbuf = memdup_user(buf + outtotal, taskout);
1862                 if (IS_ERR(outbuf))
1863                         return PTR_ERR(outbuf);
1864
1865                 outbuf_dma = pci_map_single(dd->pdev,
1866                                          outbuf,
1867                                          taskout,
1868                                          DMA_TO_DEVICE);
1869                 if (pci_dma_mapping_error(dd->pdev, outbuf_dma)) {
1870                         err = -ENOMEM;
1871                         goto abort;
1872                 }
1873                 dma_buffer = outbuf_dma;
1874         }
1875
1876         if (taskin) {
1877                 inbuf = memdup_user(buf + intotal, taskin);
1878                 if (IS_ERR(inbuf)) {
1879                         err = PTR_ERR(inbuf);
1880                         inbuf = NULL;
1881                         goto abort;
1882                 }
1883                 inbuf_dma = pci_map_single(dd->pdev,
1884                                          inbuf,
1885                                          taskin, DMA_FROM_DEVICE);
1886                 if (pci_dma_mapping_error(dd->pdev, inbuf_dma)) {
1887                         err = -ENOMEM;
1888                         goto abort;
1889                 }
1890                 dma_buffer = inbuf_dma;
1891         }
1892
1893         /* only supports PIO and non-data commands from this ioctl. */
1894         switch (req_task->data_phase) {
1895         case TASKFILE_OUT:
1896                 nsect = taskout / ATA_SECT_SIZE;
1897                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
1898                 break;
1899         case TASKFILE_IN:
1900                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
1901                 break;
1902         case TASKFILE_NO_DATA:
1903                 reply = (dd->port->rxfis + RX_FIS_D2H_REG);
1904                 break;
1905         default:
1906                 err = -EINVAL;
1907                 goto abort;
1908         }
1909
1910         /* Build the FIS. */
1911         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1912
1913         fis.type        = 0x27;
1914         fis.opts        = 1 << 7;
1915         fis.command     = req_task->io_ports[7];
1916         fis.features    = req_task->io_ports[1];
1917         fis.sect_count  = req_task->io_ports[2];
1918         fis.lba_low     = req_task->io_ports[3];
1919         fis.lba_mid     = req_task->io_ports[4];
1920         fis.lba_hi      = req_task->io_ports[5];
1921          /* Clear the dev bit*/
1922         fis.device      = req_task->io_ports[6] & ~0x10;
1923
1924         if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
1925                 req_task->in_flags.all  =
1926                         IDE_TASKFILE_STD_IN_FLAGS |
1927                         (IDE_HOB_STD_IN_FLAGS << 8);
1928                 fis.lba_low_ex          = req_task->hob_ports[3];
1929                 fis.lba_mid_ex          = req_task->hob_ports[4];
1930                 fis.lba_hi_ex           = req_task->hob_ports[5];
1931                 fis.features_ex         = req_task->hob_ports[1];
1932                 fis.sect_cnt_ex         = req_task->hob_ports[2];
1933
1934         } else {
1935                 req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
1936         }
1937
1938         force_single_sector = implicit_sector(fis.command, fis.features);
1939
1940         if ((taskin || taskout) && (!fis.sect_count)) {
1941                 if (nsect)
1942                         fis.sect_count = nsect;
1943                 else {
1944                         if (!force_single_sector) {
1945                                 dev_warn(&dd->pdev->dev,
1946                                         "data movement but "
1947                                         "sect_count is 0\n");
1948                                         err = -EINVAL;
1949                                         goto abort;
1950                         }
1951                 }
1952         }
1953
1954         dbg_printk(MTIP_DRV_NAME
1955                 " %s: cmd %x, feat %x, nsect %x,"
1956                 " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
1957                 " head/dev %x\n",
1958                 __func__,
1959                 fis.command,
1960                 fis.features,
1961                 fis.sect_count,
1962                 fis.lba_low,
1963                 fis.lba_mid,
1964                 fis.lba_hi,
1965                 fis.device);
1966
1967         /* check for erase mode support during secure erase.*/
1968         if ((fis.command == ATA_CMD_SEC_ERASE_UNIT) && outbuf &&
1969                                         (outbuf[0] & MTIP_SEC_ERASE_MODE)) {
1970                 erasemode = 1;
1971         }
1972
1973         mtip_set_timeout(dd, &fis, &timeout, erasemode);
1974
1975         /* Determine the correct transfer size.*/
1976         if (force_single_sector)
1977                 transfer_size = ATA_SECT_SIZE;
1978         else
1979                 transfer_size = ATA_SECT_SIZE * fis.sect_count;
1980
1981         /* Execute the command.*/
1982         if (mtip_exec_internal_command(dd->port,
1983                                  &fis,
1984                                  5,
1985                                  dma_buffer,
1986                                  transfer_size,
1987                                  0,
1988                                  timeout) < 0) {
1989                 err = -EIO;
1990                 goto abort;
1991         }
1992
1993         task_file_data = readl(dd->port->mmio+PORT_TFDATA);
1994
1995         if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
1996                 reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
1997                 req_task->io_ports[7] = reply->control;
1998         } else {
1999                 reply = dd->port->rxfis + RX_FIS_D2H_REG;
2000                 req_task->io_ports[7] = reply->command;
2001         }
2002
2003         /* reclaim the DMA buffers.*/
2004         if (inbuf_dma)
2005                 pci_unmap_single(dd->pdev, inbuf_dma,
2006                         taskin, DMA_FROM_DEVICE);
2007         if (outbuf_dma)
2008                 pci_unmap_single(dd->pdev, outbuf_dma,
2009                         taskout, DMA_TO_DEVICE);
2010         inbuf_dma  = 0;
2011         outbuf_dma = 0;
2012
2013         /* return the ATA registers to the caller.*/
2014         req_task->io_ports[1] = reply->features;
2015         req_task->io_ports[2] = reply->sect_count;
2016         req_task->io_ports[3] = reply->lba_low;
2017         req_task->io_ports[4] = reply->lba_mid;
2018         req_task->io_ports[5] = reply->lba_hi;
2019         req_task->io_ports[6] = reply->device;
2020
2021         if (req_task->out_flags.all & 1)  {
2022
2023                 req_task->hob_ports[3] = reply->lba_low_ex;
2024                 req_task->hob_ports[4] = reply->lba_mid_ex;
2025                 req_task->hob_ports[5] = reply->lba_hi_ex;
2026                 req_task->hob_ports[1] = reply->features_ex;
2027                 req_task->hob_ports[2] = reply->sect_cnt_ex;
2028         }
2029         dbg_printk(MTIP_DRV_NAME
2030                 " %s: Completion: stat %x,"
2031                 "err %x, sect_cnt %x, lbalo %x,"
2032                 "lbamid %x, lbahi %x, dev %x\n",
2033                 __func__,
2034                 req_task->io_ports[7],
2035                 req_task->io_ports[1],
2036                 req_task->io_ports[2],
2037                 req_task->io_ports[3],
2038                 req_task->io_ports[4],
2039                 req_task->io_ports[5],
2040                 req_task->io_ports[6]);
2041
2042         if (taskout) {
2043                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
2044                         err = -EFAULT;
2045                         goto abort;
2046                 }
2047         }
2048         if (taskin) {
2049                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
2050                         err = -EFAULT;
2051                         goto abort;
2052                 }
2053         }
2054 abort:
2055         if (inbuf_dma)
2056                 pci_unmap_single(dd->pdev, inbuf_dma,
2057                                         taskin, DMA_FROM_DEVICE);
2058         if (outbuf_dma)
2059                 pci_unmap_single(dd->pdev, outbuf_dma,
2060                                         taskout, DMA_TO_DEVICE);
2061         kfree(outbuf);
2062         kfree(inbuf);
2063
2064         return err;
2065 }
2066
2067 /*
2068  * Handle IOCTL calls from the Block Layer.
2069  *
2070  * This function is called by the Block Layer when it receives an IOCTL
2071  * command that it does not understand. If the IOCTL command is not supported
2072  * this function returns -ENOTTY.
2073  *
2074  * @dd  Pointer to the driver data structure.
2075  * @cmd IOCTL command passed from the Block Layer.
2076  * @arg IOCTL argument passed from the Block Layer.
2077  *
2078  * return value
2079  *      0       The IOCTL completed successfully.
2080  *      -ENOTTY The specified command is not supported.
2081  *      -EFAULT An error occurred copying data to a user space buffer.
2082  *      -EIO    An error occurred while executing the command.
2083  */
2084 static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
2085                          unsigned long arg)
2086 {
2087         switch (cmd) {
2088         case HDIO_GET_IDENTITY:
2089         {
2090                 if (copy_to_user((void __user *)arg, dd->port->identify,
2091                                                 sizeof(u16) * ATA_ID_WORDS))
2092                         return -EFAULT;
2093                 break;
2094         }
2095         case HDIO_DRIVE_CMD:
2096         {
2097                 u8 drive_command[4];
2098
2099                 /* Copy the user command info to our buffer. */
2100                 if (copy_from_user(drive_command,
2101                                          (void __user *) arg,
2102                                          sizeof(drive_command)))
2103                         return -EFAULT;
2104
2105                 /* Execute the drive command. */
2106                 if (exec_drive_command(dd->port,
2107                                          drive_command,
2108                                          (void __user *) (arg+4)))
2109                         return -EIO;
2110
2111                 /* Copy the status back to the users buffer. */
2112                 if (copy_to_user((void __user *) arg,
2113                                          drive_command,
2114                                          sizeof(drive_command)))
2115                         return -EFAULT;
2116
2117                 break;
2118         }
2119         case HDIO_DRIVE_TASK:
2120         {
2121                 u8 drive_command[7];
2122
2123                 /* Copy the user command info to our buffer. */
2124                 if (copy_from_user(drive_command,
2125                                          (void __user *) arg,
2126                                          sizeof(drive_command)))
2127                         return -EFAULT;
2128
2129                 /* Execute the drive command. */
2130                 if (exec_drive_task(dd->port, drive_command))
2131                         return -EIO;
2132
2133                 /* Copy the status back to the users buffer. */
2134                 if (copy_to_user((void __user *) arg,
2135                                          drive_command,
2136                                          sizeof(drive_command)))
2137                         return -EFAULT;
2138
2139                 break;
2140         }
2141         case HDIO_DRIVE_TASKFILE: {
2142                 ide_task_request_t req_task;
2143                 int ret, outtotal;
2144
2145                 if (copy_from_user(&req_task, (void __user *) arg,
2146                                         sizeof(req_task)))
2147                         return -EFAULT;
2148
2149                 outtotal = sizeof(req_task);
2150
2151                 ret = exec_drive_taskfile(dd, (void __user *) arg,
2152                                                 &req_task, outtotal);
2153
2154                 if (copy_to_user((void __user *) arg, &req_task,
2155                                                         sizeof(req_task)))
2156                         return -EFAULT;
2157
2158                 return ret;
2159         }
2160
2161         default:
2162                 return -EINVAL;
2163         }
2164         return 0;
2165 }
2166
2167 /*
2168  * Submit an IO to the hw
2169  *
2170  * This function is called by the block layer to issue an io
2171  * to the device. Upon completion, the callback function will
2172  * be called with the data parameter passed as the callback data.
2173  *
2174  * @dd       Pointer to the driver data structure.
2175  * @start    First sector to read.
2176  * @nsect    Number of sectors to read.
2177  * @nents    Number of entries in scatter list for the read command.
2178  * @tag      The tag of this read command.
2179  * @callback Pointer to the function that should be called
2180  *           when the read completes.
2181  * @data     Callback data passed to the callback function
2182  *           when the read completes.
2183  * @dir      Direction (read or write)
2184  *
2185  * return value
2186  *      None
2187  */
2188 static void mtip_hw_submit_io(struct driver_data *dd, struct request *rq,
2189                               struct mtip_cmd *command, int nents,
2190                               struct blk_mq_hw_ctx *hctx)
2191 {
2192         struct host_to_dev_fis  *fis;
2193         struct mtip_port *port = dd->port;
2194         int dma_dir = rq_data_dir(rq) == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2195         u64 start = blk_rq_pos(rq);
2196         unsigned int nsect = blk_rq_sectors(rq);
2197
2198         /* Map the scatter list for DMA access */
2199         nents = dma_map_sg(&dd->pdev->dev, command->sg, nents, dma_dir);
2200
2201         prefetch(&port->flags);
2202
2203         command->scatter_ents = nents;
2204
2205         /*
2206          * The number of retries for this command before it is
2207          * reported as a failure to the upper layers.
2208          */
2209         command->retries = MTIP_MAX_RETRIES;
2210
2211         /* Fill out fis */
2212         fis = command->command;
2213         fis->type        = 0x27;
2214         fis->opts        = 1 << 7;
2215         if (dma_dir == DMA_FROM_DEVICE)
2216                 fis->command = ATA_CMD_FPDMA_READ;
2217         else
2218                 fis->command = ATA_CMD_FPDMA_WRITE;
2219         fis->lba_low     = start & 0xFF;
2220         fis->lba_mid     = (start >> 8) & 0xFF;
2221         fis->lba_hi      = (start >> 16) & 0xFF;
2222         fis->lba_low_ex  = (start >> 24) & 0xFF;
2223         fis->lba_mid_ex  = (start >> 32) & 0xFF;
2224         fis->lba_hi_ex   = (start >> 40) & 0xFF;
2225         fis->device      = 1 << 6;
2226         fis->features    = nsect & 0xFF;
2227         fis->features_ex = (nsect >> 8) & 0xFF;
2228         fis->sect_count  = ((rq->tag << 3) | (rq->tag >> 5));
2229         fis->sect_cnt_ex = 0;
2230         fis->control     = 0;
2231         fis->res2        = 0;
2232         fis->res3        = 0;
2233         fill_command_sg(dd, command, nents);
2234
2235         if (unlikely(command->unaligned))
2236                 fis->device |= 1 << 7;
2237
2238         /* Populate the command header */
2239         command->command_header->opts =
2240                         __force_bit2int cpu_to_le32(
2241                                 (nents << 16) | 5 | AHCI_CMD_PREFETCH);
2242         command->command_header->byte_count = 0;
2243
2244         command->direction = dma_dir;
2245
2246         /*
2247          * To prevent this command from being issued
2248          * if an internal command is in progress or error handling is active.
2249          */
2250         if (unlikely(port->flags & MTIP_PF_PAUSE_IO)) {
2251                 set_bit(rq->tag, port->cmds_to_issue);
2252                 set_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2253                 return;
2254         }
2255
2256         /* Issue the command to the hardware */
2257         mtip_issue_ncq_command(port, rq->tag);
2258 }
2259
2260 /*
2261  * Sysfs status dump.
2262  *
2263  * @dev  Pointer to the device structure, passed by the kernrel.
2264  * @attr Pointer to the device_attribute structure passed by the kernel.
2265  * @buf  Pointer to the char buffer that will receive the stats info.
2266  *
2267  * return value
2268  *      The size, in bytes, of the data copied into buf.
2269  */
2270 static ssize_t mtip_hw_show_status(struct device *dev,
2271                                 struct device_attribute *attr,
2272                                 char *buf)
2273 {
2274         struct driver_data *dd = dev_to_disk(dev)->private_data;
2275         int size = 0;
2276
2277         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
2278                 size += sprintf(buf, "%s", "thermal_shutdown\n");
2279         else if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag))
2280                 size += sprintf(buf, "%s", "write_protect\n");
2281         else
2282                 size += sprintf(buf, "%s", "online\n");
2283
2284         return size;
2285 }
2286
2287 static DEVICE_ATTR(status, 0444, mtip_hw_show_status, NULL);
2288
2289 /* debugsfs entries */
2290
2291 static ssize_t show_device_status(struct device_driver *drv, char *buf)
2292 {
2293         int size = 0;
2294         struct driver_data *dd, *tmp;
2295         unsigned long flags;
2296         char id_buf[42];
2297         u16 status = 0;
2298
2299         spin_lock_irqsave(&dev_lock, flags);
2300         size += sprintf(&buf[size], "Devices Present:\n");
2301         list_for_each_entry_safe(dd, tmp, &online_list, online_list) {
2302                 if (dd->pdev) {
2303                         if (dd->port &&
2304                             dd->port->identify &&
2305                             dd->port->identify_valid) {
2306                                 strlcpy(id_buf,
2307                                         (char *) (dd->port->identify + 10), 21);
2308                                 status = *(dd->port->identify + 141);
2309                         } else {
2310                                 memset(id_buf, 0, 42);
2311                                 status = 0;
2312                         }
2313
2314                         if (dd->port &&
2315                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2316                                 size += sprintf(&buf[size],
2317                                         " device %s %s (ftl rebuild %d %%)\n",
2318                                         dev_name(&dd->pdev->dev),
2319                                         id_buf,
2320                                         status);
2321                         } else {
2322                                 size += sprintf(&buf[size],
2323                                         " device %s %s\n",
2324                                         dev_name(&dd->pdev->dev),
2325                                         id_buf);
2326                         }
2327                 }
2328         }
2329
2330         size += sprintf(&buf[size], "Devices Being Removed:\n");
2331         list_for_each_entry_safe(dd, tmp, &removing_list, remove_list) {
2332                 if (dd->pdev) {
2333                         if (dd->port &&
2334                             dd->port->identify &&
2335                             dd->port->identify_valid) {
2336                                 strlcpy(id_buf,
2337                                         (char *) (dd->port->identify+10), 21);
2338                                 status = *(dd->port->identify + 141);
2339                         } else {
2340                                 memset(id_buf, 0, 42);
2341                                 status = 0;
2342                         }
2343
2344                         if (dd->port &&
2345                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2346                                 size += sprintf(&buf[size],
2347                                         " device %s %s (ftl rebuild %d %%)\n",
2348                                         dev_name(&dd->pdev->dev),
2349                                         id_buf,
2350                                         status);
2351                         } else {
2352                                 size += sprintf(&buf[size],
2353                                         " device %s %s\n",
2354                                         dev_name(&dd->pdev->dev),
2355                                         id_buf);
2356                         }
2357                 }
2358         }
2359         spin_unlock_irqrestore(&dev_lock, flags);
2360
2361         return size;
2362 }
2363
2364 static ssize_t mtip_hw_read_device_status(struct file *f, char __user *ubuf,
2365                                                 size_t len, loff_t *offset)
2366 {
2367         struct driver_data *dd =  (struct driver_data *)f->private_data;
2368         int size = *offset;
2369         char *buf;
2370         int rv = 0;
2371
2372         if (!len || *offset)
2373                 return 0;
2374
2375         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2376         if (!buf) {
2377                 dev_err(&dd->pdev->dev,
2378                         "Memory allocation: status buffer\n");
2379                 return -ENOMEM;
2380         }
2381
2382         size += show_device_status(NULL, buf);
2383
2384         *offset = size <= len ? size : len;
2385         size = copy_to_user(ubuf, buf, *offset);
2386         if (size)
2387                 rv = -EFAULT;
2388
2389         kfree(buf);
2390         return rv ? rv : *offset;
2391 }
2392
2393 static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
2394                                   size_t len, loff_t *offset)
2395 {
2396         struct driver_data *dd =  (struct driver_data *)f->private_data;
2397         char *buf;
2398         u32 group_allocated;
2399         int size = *offset;
2400         int n, rv = 0;
2401
2402         if (!len || size)
2403                 return 0;
2404
2405         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2406         if (!buf) {
2407                 dev_err(&dd->pdev->dev,
2408                         "Memory allocation: register buffer\n");
2409                 return -ENOMEM;
2410         }
2411
2412         size += sprintf(&buf[size], "H/ S ACTive      : [ 0x");
2413
2414         for (n = dd->slot_groups-1; n >= 0; n--)
2415                 size += sprintf(&buf[size], "%08X ",
2416                                          readl(dd->port->s_active[n]));
2417
2418         size += sprintf(&buf[size], "]\n");
2419         size += sprintf(&buf[size], "H/ Command Issue : [ 0x");
2420
2421         for (n = dd->slot_groups-1; n >= 0; n--)
2422                 size += sprintf(&buf[size], "%08X ",
2423                                         readl(dd->port->cmd_issue[n]));
2424
2425         size += sprintf(&buf[size], "]\n");
2426         size += sprintf(&buf[size], "H/ Completed     : [ 0x");
2427
2428         for (n = dd->slot_groups-1; n >= 0; n--)
2429                 size += sprintf(&buf[size], "%08X ",
2430                                 readl(dd->port->completed[n]));
2431
2432         size += sprintf(&buf[size], "]\n");
2433         size += sprintf(&buf[size], "H/ PORT IRQ STAT : [ 0x%08X ]\n",
2434                                 readl(dd->port->mmio + PORT_IRQ_STAT));
2435         size += sprintf(&buf[size], "H/ HOST IRQ STAT : [ 0x%08X ]\n",
2436                                 readl(dd->mmio + HOST_IRQ_STAT));
2437         size += sprintf(&buf[size], "\n");
2438
2439         size += sprintf(&buf[size], "L/ Commands in Q : [ 0x");
2440
2441         for (n = dd->slot_groups-1; n >= 0; n--) {
2442                 if (sizeof(long) > sizeof(u32))
2443                         group_allocated =
2444                                 dd->port->cmds_to_issue[n/2] >> (32*(n&1));
2445                 else
2446                         group_allocated = dd->port->cmds_to_issue[n];
2447                 size += sprintf(&buf[size], "%08X ", group_allocated);
2448         }
2449         size += sprintf(&buf[size], "]\n");
2450
2451         *offset = size <= len ? size : len;
2452         size = copy_to_user(ubuf, buf, *offset);
2453         if (size)
2454                 rv = -EFAULT;
2455
2456         kfree(buf);
2457         return rv ? rv : *offset;
2458 }
2459
2460 static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
2461                                   size_t len, loff_t *offset)
2462 {
2463         struct driver_data *dd =  (struct driver_data *)f->private_data;
2464         char *buf;
2465         int size = *offset;
2466         int rv = 0;
2467
2468         if (!len || size)
2469                 return 0;
2470
2471         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2472         if (!buf) {
2473                 dev_err(&dd->pdev->dev,
2474                         "Memory allocation: flag buffer\n");
2475                 return -ENOMEM;
2476         }
2477
2478         size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
2479                                                         dd->port->flags);
2480         size += sprintf(&buf[size], "Flag-dd   : [ %08lX ]\n",
2481                                                         dd->dd_flag);
2482
2483         *offset = size <= len ? size : len;
2484         size = copy_to_user(ubuf, buf, *offset);
2485         if (size)
2486                 rv = -EFAULT;
2487
2488         kfree(buf);
2489         return rv ? rv : *offset;
2490 }
2491
2492 static const struct file_operations mtip_device_status_fops = {
2493         .owner  = THIS_MODULE,
2494         .open   = simple_open,
2495         .read   = mtip_hw_read_device_status,
2496         .llseek = no_llseek,
2497 };
2498
2499 static const struct file_operations mtip_regs_fops = {
2500         .owner  = THIS_MODULE,
2501         .open   = simple_open,
2502         .read   = mtip_hw_read_registers,
2503         .llseek = no_llseek,
2504 };
2505
2506 static const struct file_operations mtip_flags_fops = {
2507         .owner  = THIS_MODULE,
2508         .open   = simple_open,
2509         .read   = mtip_hw_read_flags,
2510         .llseek = no_llseek,
2511 };
2512
2513 /*
2514  * Create the sysfs related attributes.
2515  *
2516  * @dd   Pointer to the driver data structure.
2517  * @kobj Pointer to the kobj for the block device.
2518  *
2519  * return value
2520  *      0       Operation completed successfully.
2521  *      -EINVAL Invalid parameter.
2522  */
2523 static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
2524 {
2525         if (!kobj || !dd)
2526                 return -EINVAL;
2527
2528         if (sysfs_create_file(kobj, &dev_attr_status.attr))
2529                 dev_warn(&dd->pdev->dev,
2530                         "Error creating 'status' sysfs entry\n");
2531         return 0;
2532 }
2533
2534 /*
2535  * Remove the sysfs related attributes.
2536  *
2537  * @dd   Pointer to the driver data structure.
2538  * @kobj Pointer to the kobj for the block device.
2539  *
2540  * return value
2541  *      0       Operation completed successfully.
2542  *      -EINVAL Invalid parameter.
2543  */
2544 static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
2545 {
2546         if (!kobj || !dd)
2547                 return -EINVAL;
2548
2549         sysfs_remove_file(kobj, &dev_attr_status.attr);
2550
2551         return 0;
2552 }
2553
2554 static int mtip_hw_debugfs_init(struct driver_data *dd)
2555 {
2556         if (!dfs_parent)
2557                 return -1;
2558
2559         dd->dfs_node = debugfs_create_dir(dd->disk->disk_name, dfs_parent);
2560         if (IS_ERR_OR_NULL(dd->dfs_node)) {
2561                 dev_warn(&dd->pdev->dev,
2562                         "Error creating node %s under debugfs\n",
2563                                                 dd->disk->disk_name);
2564                 dd->dfs_node = NULL;
2565                 return -1;
2566         }
2567
2568         debugfs_create_file("flags", 0444, dd->dfs_node, dd, &mtip_flags_fops);
2569         debugfs_create_file("registers", 0444, dd->dfs_node, dd,
2570                             &mtip_regs_fops);
2571
2572         return 0;
2573 }
2574
2575 static void mtip_hw_debugfs_exit(struct driver_data *dd)
2576 {
2577         debugfs_remove_recursive(dd->dfs_node);
2578 }
2579
2580 /*
2581  * Perform any init/resume time hardware setup
2582  *
2583  * @dd Pointer to the driver data structure.
2584  *
2585  * return value
2586  *      None
2587  */
2588 static inline void hba_setup(struct driver_data *dd)
2589 {
2590         u32 hwdata;
2591         hwdata = readl(dd->mmio + HOST_HSORG);
2592
2593         /* interrupt bug workaround: use only 1 IS bit.*/
2594         writel(hwdata |
2595                 HSORG_DISABLE_SLOTGRP_INTR |
2596                 HSORG_DISABLE_SLOTGRP_PXIS,
2597                 dd->mmio + HOST_HSORG);
2598 }
2599
2600 static int mtip_device_unaligned_constrained(struct driver_data *dd)
2601 {
2602         return (dd->pdev->device == P420M_DEVICE_ID ? 1 : 0);
2603 }
2604
2605 /*
2606  * Detect the details of the product, and store anything needed
2607  * into the driver data structure.  This includes product type and
2608  * version and number of slot groups.
2609  *
2610  * @dd Pointer to the driver data structure.
2611  *
2612  * return value
2613  *      None
2614  */
2615 static void mtip_detect_product(struct driver_data *dd)
2616 {
2617         u32 hwdata;
2618         unsigned int rev, slotgroups;
2619
2620         /*
2621          * HBA base + 0xFC [15:0] - vendor-specific hardware interface
2622          * info register:
2623          * [15:8] hardware/software interface rev#
2624          * [   3] asic-style interface
2625          * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
2626          */
2627         hwdata = readl(dd->mmio + HOST_HSORG);
2628
2629         dd->product_type = MTIP_PRODUCT_UNKNOWN;
2630         dd->slot_groups = 1;
2631
2632         if (hwdata & 0x8) {
2633                 dd->product_type = MTIP_PRODUCT_ASICFPGA;
2634                 rev = (hwdata & HSORG_HWREV) >> 8;
2635                 slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
2636                 dev_info(&dd->pdev->dev,
2637                         "ASIC-FPGA design, HS rev 0x%x, "
2638                         "%i slot groups [%i slots]\n",
2639                          rev,
2640                          slotgroups,
2641                          slotgroups * 32);
2642
2643                 if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
2644                         dev_warn(&dd->pdev->dev,
2645                                 "Warning: driver only supports "
2646                                 "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
2647                         slotgroups = MTIP_MAX_SLOT_GROUPS;
2648                 }
2649                 dd->slot_groups = slotgroups;
2650                 return;
2651         }
2652
2653         dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
2654 }
2655
2656 /*
2657  * Blocking wait for FTL rebuild to complete
2658  *
2659  * @dd Pointer to the DRIVER_DATA structure.
2660  *
2661  * return value
2662  *      0       FTL rebuild completed successfully
2663  *      -EFAULT FTL rebuild error/timeout/interruption
2664  */
2665 static int mtip_ftl_rebuild_poll(struct driver_data *dd)
2666 {
2667         unsigned long timeout, cnt = 0, start;
2668
2669         dev_warn(&dd->pdev->dev,
2670                 "FTL rebuild in progress. Polling for completion.\n");
2671
2672         start = jiffies;
2673         timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
2674
2675         do {
2676                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2677                                 &dd->dd_flag)))
2678                         return -EFAULT;
2679                 if (mtip_check_surprise_removal(dd->pdev))
2680                         return -EFAULT;
2681
2682                 if (mtip_get_identify(dd->port, NULL) < 0)
2683                         return -EFAULT;
2684
2685                 if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2686                         MTIP_FTL_REBUILD_MAGIC) {
2687                         ssleep(1);
2688                         /* Print message every 3 minutes */
2689                         if (cnt++ >= 180) {
2690                                 dev_warn(&dd->pdev->dev,
2691                                 "FTL rebuild in progress (%d secs).\n",
2692                                 jiffies_to_msecs(jiffies - start) / 1000);
2693                                 cnt = 0;
2694                         }
2695                 } else {
2696                         dev_warn(&dd->pdev->dev,
2697                                 "FTL rebuild complete (%d secs).\n",
2698                         jiffies_to_msecs(jiffies - start) / 1000);
2699                         mtip_block_initialize(dd);
2700                         return 0;
2701                 }
2702         } while (time_before(jiffies, timeout));
2703
2704         /* Check for timeout */
2705         dev_err(&dd->pdev->dev,
2706                 "Timed out waiting for FTL rebuild to complete (%d secs).\n",
2707                 jiffies_to_msecs(jiffies - start) / 1000);
2708         return -EFAULT;
2709 }
2710
2711 static void mtip_softirq_done_fn(struct request *rq)
2712 {
2713         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
2714         struct driver_data *dd = rq->q->queuedata;
2715
2716         /* Unmap the DMA scatter list entries */
2717         dma_unmap_sg(&dd->pdev->dev, cmd->sg, cmd->scatter_ents,
2718                                                         cmd->direction);
2719
2720         if (unlikely(cmd->unaligned))
2721                 up(&dd->port->cmd_slot_unal);
2722
2723         blk_mq_end_request(rq, cmd->status);
2724 }
2725
2726 static void mtip_abort_cmd(struct request *req, void *data, bool reserved)
2727 {
2728         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(req);
2729         struct driver_data *dd = data;
2730
2731         dbg_printk(MTIP_DRV_NAME " Aborting request, tag = %d\n", req->tag);
2732
2733         clear_bit(req->tag, dd->port->cmds_to_issue);
2734         cmd->status = BLK_STS_IOERR;
2735         mtip_softirq_done_fn(req);
2736 }
2737
2738 static void mtip_queue_cmd(struct request *req, void *data, bool reserved)
2739 {
2740         struct driver_data *dd = data;
2741
2742         set_bit(req->tag, dd->port->cmds_to_issue);
2743         blk_abort_request(req);
2744 }
2745
2746 /*
2747  * service thread to issue queued commands
2748  *
2749  * @data Pointer to the driver data structure.
2750  *
2751  * return value
2752  *      0
2753  */
2754
2755 static int mtip_service_thread(void *data)
2756 {
2757         struct driver_data *dd = (struct driver_data *)data;
2758         unsigned long slot, slot_start, slot_wrap, to;
2759         unsigned int num_cmd_slots = dd->slot_groups * 32;
2760         struct mtip_port *port = dd->port;
2761
2762         while (1) {
2763                 if (kthread_should_stop() ||
2764                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2765                         goto st_out;
2766                 clear_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2767
2768                 /*
2769                  * the condition is to check neither an internal command is
2770                  * is in progress nor error handling is active
2771                  */
2772                 wait_event_interruptible(port->svc_wait, (port->flags) &&
2773                         (port->flags & MTIP_PF_SVC_THD_WORK));
2774
2775                 if (kthread_should_stop() ||
2776                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2777                         goto st_out;
2778
2779                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2780                                 &dd->dd_flag)))
2781                         goto st_out;
2782
2783                 set_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2784
2785 restart_eh:
2786                 /* Demux bits: start with error handling */
2787                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags)) {
2788                         mtip_handle_tfe(dd);
2789                         clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
2790                 }
2791
2792                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags))
2793                         goto restart_eh;
2794
2795                 if (test_bit(MTIP_PF_TO_ACTIVE_BIT, &port->flags)) {
2796                         to = jiffies + msecs_to_jiffies(5000);
2797
2798                         do {
2799                                 mdelay(100);
2800                         } while (atomic_read(&dd->irq_workers_active) != 0 &&
2801                                 time_before(jiffies, to));
2802
2803                         if (atomic_read(&dd->irq_workers_active) != 0)
2804                                 dev_warn(&dd->pdev->dev,
2805                                         "Completion workers still active!");
2806
2807                         blk_mq_quiesce_queue(dd->queue);
2808
2809                         spin_lock(dd->queue->queue_lock);
2810                         blk_mq_tagset_busy_iter(&dd->tags,
2811                                                         mtip_queue_cmd, dd);
2812                         spin_unlock(dd->queue->queue_lock);
2813
2814                         set_bit(MTIP_PF_ISSUE_CMDS_BIT, &dd->port->flags);
2815
2816                         if (mtip_device_reset(dd))
2817                                 blk_mq_tagset_busy_iter(&dd->tags,
2818                                                         mtip_abort_cmd, dd);
2819
2820                         clear_bit(MTIP_PF_TO_ACTIVE_BIT, &dd->port->flags);
2821
2822                         blk_mq_unquiesce_queue(dd->queue);
2823                 }
2824
2825                 if (test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
2826                         slot = 1;
2827                         /* used to restrict the loop to one iteration */
2828                         slot_start = num_cmd_slots;
2829                         slot_wrap = 0;
2830                         while (1) {
2831                                 slot = find_next_bit(port->cmds_to_issue,
2832                                                 num_cmd_slots, slot);
2833                                 if (slot_wrap == 1) {
2834                                         if ((slot_start >= slot) ||
2835                                                 (slot >= num_cmd_slots))
2836                                                 break;
2837                                 }
2838                                 if (unlikely(slot_start == num_cmd_slots))
2839                                         slot_start = slot;
2840
2841                                 if (unlikely(slot == num_cmd_slots)) {
2842                                         slot = 1;
2843                                         slot_wrap = 1;
2844                                         continue;
2845                                 }
2846
2847                                 /* Issue the command to the hardware */
2848                                 mtip_issue_ncq_command(port, slot);
2849
2850                                 clear_bit(slot, port->cmds_to_issue);
2851                         }
2852
2853                         clear_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2854                 }
2855
2856                 if (test_bit(MTIP_PF_REBUILD_BIT, &port->flags)) {
2857                         if (mtip_ftl_rebuild_poll(dd) == 0)
2858                                 clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
2859                 }
2860         }
2861
2862 st_out:
2863         return 0;
2864 }
2865
2866 /*
2867  * DMA region teardown
2868  *
2869  * @dd Pointer to driver_data structure
2870  *
2871  * return value
2872  *      None
2873  */
2874 static void mtip_dma_free(struct driver_data *dd)
2875 {
2876         struct mtip_port *port = dd->port;
2877
2878         if (port->block1)
2879                 dmam_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2880                                         port->block1, port->block1_dma);
2881
2882         if (port->command_list) {
2883                 dmam_free_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
2884                                 port->command_list, port->command_list_dma);
2885         }
2886 }
2887
2888 /*
2889  * DMA region setup
2890  *
2891  * @dd Pointer to driver_data structure
2892  *
2893  * return value
2894  *      -ENOMEM Not enough free DMA region space to initialize driver
2895  */
2896 static int mtip_dma_alloc(struct driver_data *dd)
2897 {
2898         struct mtip_port *port = dd->port;
2899
2900         /* Allocate dma memory for RX Fis, Identify, and Sector Bufffer */
2901         port->block1 =
2902                 dmam_alloc_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2903                                         &port->block1_dma, GFP_KERNEL);
2904         if (!port->block1)
2905                 return -ENOMEM;
2906         memset(port->block1, 0, BLOCK_DMA_ALLOC_SZ);
2907
2908         /* Allocate dma memory for command list */
2909         port->command_list =
2910                 dmam_alloc_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
2911                                         &port->command_list_dma, GFP_KERNEL);
2912         if (!port->command_list) {
2913                 dmam_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2914                                         port->block1, port->block1_dma);
2915                 port->block1 = NULL;
2916                 port->block1_dma = 0;
2917                 return -ENOMEM;
2918         }
2919         memset(port->command_list, 0, AHCI_CMD_TBL_SZ);
2920
2921         /* Setup all pointers into first DMA region */
2922         port->rxfis         = port->block1 + AHCI_RX_FIS_OFFSET;
2923         port->rxfis_dma     = port->block1_dma + AHCI_RX_FIS_OFFSET;
2924         port->identify      = port->block1 + AHCI_IDFY_OFFSET;
2925         port->identify_dma  = port->block1_dma + AHCI_IDFY_OFFSET;
2926         port->log_buf       = port->block1 + AHCI_SECTBUF_OFFSET;
2927         port->log_buf_dma   = port->block1_dma + AHCI_SECTBUF_OFFSET;
2928         port->smart_buf     = port->block1 + AHCI_SMARTBUF_OFFSET;
2929         port->smart_buf_dma = port->block1_dma + AHCI_SMARTBUF_OFFSET;
2930
2931         return 0;
2932 }
2933
2934 static int mtip_hw_get_identify(struct driver_data *dd)
2935 {
2936         struct smart_attr attr242;
2937         unsigned char *buf;
2938         int rv;
2939
2940         if (mtip_get_identify(dd->port, NULL) < 0)
2941                 return -EFAULT;
2942
2943         if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2944                 MTIP_FTL_REBUILD_MAGIC) {
2945                 set_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags);
2946                 return MTIP_FTL_REBUILD_MAGIC;
2947         }
2948         mtip_dump_identify(dd->port);
2949
2950         /* check write protect, over temp and rebuild statuses */
2951         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
2952                                 dd->port->log_buf,
2953                                 dd->port->log_buf_dma, 1);
2954         if (rv) {
2955                 dev_warn(&dd->pdev->dev,
2956                         "Error in READ LOG EXT (10h) command\n");
2957                 /* non-critical error, don't fail the load */
2958         } else {
2959                 buf = (unsigned char *)dd->port->log_buf;
2960                 if (buf[259] & 0x1) {
2961                         dev_info(&dd->pdev->dev,
2962                                 "Write protect bit is set.\n");
2963                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
2964                 }
2965                 if (buf[288] == 0xF7) {
2966                         dev_info(&dd->pdev->dev,
2967                                 "Exceeded Tmax, drive in thermal shutdown.\n");
2968                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
2969                 }
2970                 if (buf[288] == 0xBF) {
2971                         dev_info(&dd->pdev->dev,
2972                                 "Drive indicates rebuild has failed.\n");
2973                         set_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag);
2974                 }
2975         }
2976
2977         /* get write protect progess */
2978         memset(&attr242, 0, sizeof(struct smart_attr));
2979         if (mtip_get_smart_attr(dd->port, 242, &attr242))
2980                 dev_warn(&dd->pdev->dev,
2981                                 "Unable to check write protect progress\n");
2982         else
2983                 dev_info(&dd->pdev->dev,
2984                                 "Write protect progress: %u%% (%u blocks)\n",
2985                                 attr242.cur, le32_to_cpu(attr242.data));
2986
2987         return rv;
2988 }
2989
2990 /*
2991  * Called once for each card.
2992  *
2993  * @dd Pointer to the driver data structure.
2994  *
2995  * return value
2996  *      0 on success, else an error code.
2997  */
2998 static int mtip_hw_init(struct driver_data *dd)
2999 {
3000         int i;
3001         int rv;
3002         unsigned long timeout, timetaken;
3003
3004         dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
3005
3006         mtip_detect_product(dd);
3007         if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
3008                 rv = -EIO;
3009                 goto out1;
3010         }
3011
3012         hba_setup(dd);
3013
3014         dd->port = kzalloc_node(sizeof(struct mtip_port), GFP_KERNEL,
3015                                 dd->numa_node);
3016         if (!dd->port) {
3017                 dev_err(&dd->pdev->dev,
3018                         "Memory allocation: port structure\n");
3019                 return -ENOMEM;
3020         }
3021
3022         /* Continue workqueue setup */
3023         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
3024                 dd->work[i].port = dd->port;
3025
3026         /* Enable unaligned IO constraints for some devices */
3027         if (mtip_device_unaligned_constrained(dd))
3028                 dd->unal_qdepth = MTIP_MAX_UNALIGNED_SLOTS;
3029         else
3030                 dd->unal_qdepth = 0;
3031
3032         sema_init(&dd->port->cmd_slot_unal, dd->unal_qdepth);
3033
3034         /* Spinlock to prevent concurrent issue */
3035         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
3036                 spin_lock_init(&dd->port->cmd_issue_lock[i]);
3037
3038         /* Set the port mmio base address. */
3039         dd->port->mmio  = dd->mmio + PORT_OFFSET;
3040         dd->port->dd    = dd;
3041
3042         /* DMA allocations */
3043         rv = mtip_dma_alloc(dd);
3044         if (rv < 0)
3045                 goto out1;
3046
3047         /* Setup the pointers to the extended s_active and CI registers. */
3048         for (i = 0; i < dd->slot_groups; i++) {
3049                 dd->port->s_active[i] =
3050                         dd->port->mmio + i*0x80 + PORT_SCR_ACT;
3051                 dd->port->cmd_issue[i] =
3052                         dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
3053                 dd->port->completed[i] =
3054                         dd->port->mmio + i*0x80 + PORT_SDBV;
3055         }
3056
3057         timetaken = jiffies;
3058         timeout = jiffies + msecs_to_jiffies(30000);
3059         while (((readl(dd->port->mmio + PORT_SCR_STAT) & 0x0F) != 0x03) &&
3060                  time_before(jiffies, timeout)) {
3061                 mdelay(100);
3062         }
3063         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
3064                 timetaken = jiffies - timetaken;
3065                 dev_warn(&dd->pdev->dev,
3066                         "Surprise removal detected at %u ms\n",
3067                         jiffies_to_msecs(timetaken));
3068                 rv = -ENODEV;
3069                 goto out2 ;
3070         }
3071         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
3072                 timetaken = jiffies - timetaken;
3073                 dev_warn(&dd->pdev->dev,
3074                         "Removal detected at %u ms\n",
3075                         jiffies_to_msecs(timetaken));
3076                 rv = -EFAULT;
3077                 goto out2;
3078         }
3079
3080         /* Conditionally reset the HBA. */
3081         if (!(readl(dd->mmio + HOST_CAP) & HOST_CAP_NZDMA)) {
3082                 if (mtip_hba_reset(dd) < 0) {
3083                         dev_err(&dd->pdev->dev,
3084                                 "Card did not reset within timeout\n");
3085                         rv = -EIO;
3086                         goto out2;
3087                 }
3088         } else {
3089                 /* Clear any pending interrupts on the HBA */
3090                 writel(readl(dd->mmio + HOST_IRQ_STAT),
3091                         dd->mmio + HOST_IRQ_STAT);
3092         }
3093
3094         mtip_init_port(dd->port);
3095         mtip_start_port(dd->port);
3096
3097         /* Setup the ISR and enable interrupts. */
3098         rv = devm_request_irq(&dd->pdev->dev,
3099                                 dd->pdev->irq,
3100                                 mtip_irq_handler,
3101                                 IRQF_SHARED,
3102                                 dev_driver_string(&dd->pdev->dev),
3103                                 dd);
3104
3105         if (rv) {
3106                 dev_err(&dd->pdev->dev,
3107                         "Unable to allocate IRQ %d\n", dd->pdev->irq);
3108                 goto out2;
3109         }
3110         irq_set_affinity_hint(dd->pdev->irq, get_cpu_mask(dd->isr_binding));
3111
3112         /* Enable interrupts on the HBA. */
3113         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3114                                         dd->mmio + HOST_CTL);
3115
3116         init_waitqueue_head(&dd->port->svc_wait);
3117
3118         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
3119                 rv = -EFAULT;
3120                 goto out3;
3121         }
3122
3123         return rv;
3124
3125 out3:
3126         /* Disable interrupts on the HBA. */
3127         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3128                         dd->mmio + HOST_CTL);
3129
3130         /* Release the IRQ. */
3131         irq_set_affinity_hint(dd->pdev->irq, NULL);
3132         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3133
3134 out2:
3135         mtip_deinit_port(dd->port);
3136         mtip_dma_free(dd);
3137
3138 out1:
3139         /* Free the memory allocated for the for structure. */
3140         kfree(dd->port);
3141
3142         return rv;
3143 }
3144
3145 static int mtip_standby_drive(struct driver_data *dd)
3146 {
3147         int rv = 0;
3148
3149         if (dd->sr || !dd->port)
3150                 return -ENODEV;
3151         /*
3152          * Send standby immediate (E0h) to the drive so that it
3153          * saves its state.
3154          */
3155         if (!test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags) &&
3156             !test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag) &&
3157             !test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag)) {
3158                 rv = mtip_standby_immediate(dd->port);
3159                 if (rv)
3160                         dev_warn(&dd->pdev->dev,
3161                                 "STANDBY IMMEDIATE failed\n");
3162         }
3163         return rv;
3164 }
3165
3166 /*
3167  * Called to deinitialize an interface.
3168  *
3169  * @dd Pointer to the driver data structure.
3170  *
3171  * return value
3172  *      0
3173  */
3174 static int mtip_hw_exit(struct driver_data *dd)
3175 {
3176         if (!dd->sr) {
3177                 /* de-initialize the port. */
3178                 mtip_deinit_port(dd->port);
3179
3180                 /* Disable interrupts on the HBA. */
3181                 writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3182                                 dd->mmio + HOST_CTL);
3183         }
3184
3185         /* Release the IRQ. */
3186         irq_set_affinity_hint(dd->pdev->irq, NULL);
3187         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3188         msleep(1000);
3189
3190         /* Free dma regions */
3191         mtip_dma_free(dd);
3192
3193         /* Free the memory allocated for the for structure. */
3194         kfree(dd->port);
3195         dd->port = NULL;
3196
3197         return 0;
3198 }
3199
3200 /*
3201  * Issue a Standby Immediate command to the device.
3202  *
3203  * This function is called by the Block Layer just before the
3204  * system powers off during a shutdown.
3205  *
3206  * @dd Pointer to the driver data structure.
3207  *
3208  * return value
3209  *      0
3210  */
3211 static int mtip_hw_shutdown(struct driver_data *dd)
3212 {
3213         /*
3214          * Send standby immediate (E0h) to the drive so that it
3215          * saves its state.
3216          */
3217         mtip_standby_drive(dd);
3218
3219         return 0;
3220 }
3221
3222 /*
3223  * Suspend function
3224  *
3225  * This function is called by the Block Layer just before the
3226  * system hibernates.
3227  *
3228  * @dd Pointer to the driver data structure.
3229  *
3230  * return value
3231  *      0       Suspend was successful
3232  *      -EFAULT Suspend was not successful
3233  */
3234 static int mtip_hw_suspend(struct driver_data *dd)
3235 {
3236         /*
3237          * Send standby immediate (E0h) to the drive
3238          * so that it saves its state.
3239          */
3240         if (mtip_standby_drive(dd) != 0) {
3241                 dev_err(&dd->pdev->dev,
3242                         "Failed standby-immediate command\n");
3243                 return -EFAULT;
3244         }
3245
3246         /* Disable interrupts on the HBA.*/
3247         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3248                         dd->mmio + HOST_CTL);
3249         mtip_deinit_port(dd->port);
3250
3251         return 0;
3252 }
3253
3254 /*
3255  * Resume function
3256  *
3257  * This function is called by the Block Layer as the
3258  * system resumes.
3259  *
3260  * @dd Pointer to the driver data structure.
3261  *
3262  * return value
3263  *      0       Resume was successful
3264  *      -EFAULT Resume was not successful
3265  */
3266 static int mtip_hw_resume(struct driver_data *dd)
3267 {
3268         /* Perform any needed hardware setup steps */
3269         hba_setup(dd);
3270
3271         /* Reset the HBA */
3272         if (mtip_hba_reset(dd) != 0) {
3273                 dev_err(&dd->pdev->dev,
3274                         "Unable to reset the HBA\n");
3275                 return -EFAULT;
3276         }
3277
3278         /*
3279          * Enable the port, DMA engine, and FIS reception specific
3280          * h/w in controller.
3281          */
3282         mtip_init_port(dd->port);
3283         mtip_start_port(dd->port);
3284
3285         /* Enable interrupts on the HBA.*/
3286         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3287                         dd->mmio + HOST_CTL);
3288
3289         return 0;
3290 }
3291
3292 /*
3293  * Helper function for reusing disk name
3294  * upon hot insertion.
3295  */
3296 static int rssd_disk_name_format(char *prefix,
3297                                  int index,
3298                                  char *buf,
3299                                  int buflen)
3300 {
3301         const int base = 'z' - 'a' + 1;
3302         char *begin = buf + strlen(prefix);
3303         char *end = buf + buflen;
3304         char *p;
3305         int unit;
3306
3307         p = end - 1;
3308         *p = '\0';
3309         unit = base;
3310         do {
3311                 if (p == begin)
3312                         return -EINVAL;
3313                 *--p = 'a' + (index % unit);
3314                 index = (index / unit) - 1;
3315         } while (index >= 0);
3316
3317         memmove(begin, p, end - p);
3318         memcpy(buf, prefix, strlen(prefix));
3319
3320         return 0;
3321 }
3322
3323 /*
3324  * Block layer IOCTL handler.
3325  *
3326  * @dev Pointer to the block_device structure.
3327  * @mode ignored
3328  * @cmd IOCTL command passed from the user application.
3329  * @arg Argument passed from the user application.
3330  *
3331  * return value
3332  *      0        IOCTL completed successfully.
3333  *      -ENOTTY  IOCTL not supported or invalid driver data
3334  *                 structure pointer.
3335  */
3336 static int mtip_block_ioctl(struct block_device *dev,
3337                             fmode_t mode,
3338                             unsigned cmd,
3339                             unsigned long arg)
3340 {
3341         struct driver_data *dd = dev->bd_disk->private_data;
3342
3343         if (!capable(CAP_SYS_ADMIN))
3344                 return -EACCES;
3345
3346         if (!dd)
3347                 return -ENOTTY;
3348
3349         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3350                 return -ENOTTY;
3351
3352         switch (cmd) {
3353         case BLKFLSBUF:
3354                 return -ENOTTY;
3355         default:
3356                 return mtip_hw_ioctl(dd, cmd, arg);
3357         }
3358 }
3359
3360 #ifdef CONFIG_COMPAT
3361 /*
3362  * Block layer compat IOCTL handler.
3363  *
3364  * @dev Pointer to the block_device structure.
3365  * @mode ignored
3366  * @cmd IOCTL command passed from the user application.
3367  * @arg Argument passed from the user application.
3368  *
3369  * return value
3370  *      0        IOCTL completed successfully.
3371  *      -ENOTTY  IOCTL not supported or invalid driver data
3372  *                 structure pointer.
3373  */
3374 static int mtip_block_compat_ioctl(struct block_device *dev,
3375                             fmode_t mode,
3376                             unsigned cmd,
3377                             unsigned long arg)
3378 {
3379         struct driver_data *dd = dev->bd_disk->private_data;
3380
3381         if (!capable(CAP_SYS_ADMIN))
3382                 return -EACCES;
3383
3384         if (!dd)
3385                 return -ENOTTY;
3386
3387         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3388                 return -ENOTTY;
3389
3390         switch (cmd) {
3391         case BLKFLSBUF:
3392                 return -ENOTTY;
3393         case HDIO_DRIVE_TASKFILE: {
3394                 struct mtip_compat_ide_task_request_s __user *compat_req_task;
3395                 ide_task_request_t req_task;
3396                 int compat_tasksize, outtotal, ret;
3397
3398                 compat_tasksize =
3399                         sizeof(struct mtip_compat_ide_task_request_s);
3400
3401                 compat_req_task =
3402                         (struct mtip_compat_ide_task_request_s __user *) arg;
3403
3404                 if (copy_from_user(&req_task, (void __user *) arg,
3405                         compat_tasksize - (2 * sizeof(compat_long_t))))
3406                         return -EFAULT;
3407
3408                 if (get_user(req_task.out_size, &compat_req_task->out_size))
3409                         return -EFAULT;
3410
3411                 if (get_user(req_task.in_size, &compat_req_task->in_size))
3412                         return -EFAULT;
3413
3414                 outtotal = sizeof(struct mtip_compat_ide_task_request_s);
3415
3416                 ret = exec_drive_taskfile(dd, (void __user *) arg,
3417                                                 &req_task, outtotal);
3418
3419                 if (copy_to_user((void __user *) arg, &req_task,
3420                                 compat_tasksize -
3421                                 (2 * sizeof(compat_long_t))))
3422                         return -EFAULT;
3423
3424                 if (put_user(req_task.out_size, &compat_req_task->out_size))
3425                         return -EFAULT;
3426
3427                 if (put_user(req_task.in_size, &compat_req_task->in_size))
3428                         return -EFAULT;
3429
3430                 return ret;
3431         }
3432         default:
3433                 return mtip_hw_ioctl(dd, cmd, arg);
3434         }
3435 }
3436 #endif
3437
3438 /*
3439  * Obtain the geometry of the device.
3440  *
3441  * You may think that this function is obsolete, but some applications,
3442  * fdisk for example still used CHS values. This function describes the
3443  * device as having 224 heads and 56 sectors per cylinder. These values are
3444  * chosen so that each cylinder is aligned on a 4KB boundary. Since a
3445  * partition is described in terms of a start and end cylinder this means
3446  * that each partition is also 4KB aligned. Non-aligned partitions adversely
3447  * affects performance.
3448  *
3449  * @dev Pointer to the block_device strucutre.
3450  * @geo Pointer to a hd_geometry structure.
3451  *
3452  * return value
3453  *      0       Operation completed successfully.
3454  *      -ENOTTY An error occurred while reading the drive capacity.
3455  */
3456 static int mtip_block_getgeo(struct block_device *dev,
3457                                 struct hd_geometry *geo)
3458 {
3459         struct driver_data *dd = dev->bd_disk->private_data;
3460         sector_t capacity;
3461
3462         if (!dd)
3463                 return -ENOTTY;
3464
3465         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3466                 dev_warn(&dd->pdev->dev,
3467                         "Could not get drive capacity.\n");
3468                 return -ENOTTY;
3469         }
3470
3471         geo->heads = 224;
3472         geo->sectors = 56;
3473         sector_div(capacity, (geo->heads * geo->sectors));
3474         geo->cylinders = capacity;
3475         return 0;
3476 }
3477
3478 static int mtip_block_open(struct block_device *dev, fmode_t mode)
3479 {
3480         struct driver_data *dd;
3481
3482         if (dev && dev->bd_disk) {
3483                 dd = (struct driver_data *) dev->bd_disk->private_data;
3484
3485                 if (dd) {
3486                         if (test_bit(MTIP_DDF_REMOVAL_BIT,
3487                                                         &dd->dd_flag)) {
3488                                 return -ENODEV;
3489                         }
3490                         return 0;
3491                 }
3492         }
3493         return -ENODEV;
3494 }
3495
3496 static void mtip_block_release(struct gendisk *disk, fmode_t mode)
3497 {
3498 }
3499
3500 /*
3501  * Block device operation function.
3502  *
3503  * This structure contains pointers to the functions required by the block
3504  * layer.
3505  */
3506 static const struct block_device_operations mtip_block_ops = {
3507         .open           = mtip_block_open,
3508         .release        = mtip_block_release,
3509         .ioctl          = mtip_block_ioctl,
3510 #ifdef CONFIG_COMPAT
3511         .compat_ioctl   = mtip_block_compat_ioctl,
3512 #endif
3513         .getgeo         = mtip_block_getgeo,
3514         .owner          = THIS_MODULE
3515 };
3516
3517 static inline bool is_se_active(struct driver_data *dd)
3518 {
3519         if (unlikely(test_bit(MTIP_PF_SE_ACTIVE_BIT, &dd->port->flags))) {
3520                 if (dd->port->ic_pause_timer) {
3521                         unsigned long to = dd->port->ic_pause_timer +
3522                                                         msecs_to_jiffies(1000);
3523                         if (time_after(jiffies, to)) {
3524                                 clear_bit(MTIP_PF_SE_ACTIVE_BIT,
3525                                                         &dd->port->flags);
3526                                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag);
3527                                 dd->port->ic_pause_timer = 0;
3528                                 wake_up_interruptible(&dd->port->svc_wait);
3529                                 return false;
3530                         }
3531                 }
3532                 return true;
3533         }
3534         return false;
3535 }
3536
3537 /*
3538  * Block layer make request function.
3539  *
3540  * This function is called by the kernel to process a BIO for
3541  * the P320 device.
3542  *
3543  * @queue Pointer to the request queue. Unused other than to obtain
3544  *              the driver data structure.
3545  * @rq    Pointer to the request.
3546  *
3547  */
3548 static int mtip_submit_request(struct blk_mq_hw_ctx *hctx, struct request *rq)
3549 {
3550         struct driver_data *dd = hctx->queue->queuedata;
3551         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3552         unsigned int nents;
3553
3554         if (is_se_active(dd))
3555                 return -ENODATA;
3556
3557         if (unlikely(dd->dd_flag & MTIP_DDF_STOP_IO)) {
3558                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
3559                                                         &dd->dd_flag))) {
3560                         return -ENXIO;
3561                 }
3562                 if (unlikely(test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))) {
3563                         return -ENODATA;
3564                 }
3565                 if (unlikely(test_bit(MTIP_DDF_WRITE_PROTECT_BIT,
3566                                                         &dd->dd_flag) &&
3567                                 rq_data_dir(rq))) {
3568                         return -ENODATA;
3569                 }
3570                 if (unlikely(test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag) ||
3571                         test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag)))
3572                         return -ENODATA;
3573         }
3574
3575         if (req_op(rq) == REQ_OP_DISCARD) {
3576                 int err;
3577
3578                 err = mtip_send_trim(dd, blk_rq_pos(rq), blk_rq_sectors(rq));
3579                 blk_mq_end_request(rq, err ? BLK_STS_IOERR : BLK_STS_OK);
3580                 return 0;
3581         }
3582
3583         /* Create the scatter list for this request. */
3584         nents = blk_rq_map_sg(hctx->queue, rq, cmd->sg);
3585
3586         /* Issue the read/write. */
3587         mtip_hw_submit_io(dd, rq, cmd, nents, hctx);
3588         return 0;
3589 }
3590
3591 static bool mtip_check_unal_depth(struct blk_mq_hw_ctx *hctx,
3592                                   struct request *rq)
3593 {
3594         struct driver_data *dd = hctx->queue->queuedata;
3595         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3596
3597         if (rq_data_dir(rq) == READ || !dd->unal_qdepth)
3598                 return false;
3599
3600         /*
3601          * If unaligned depth must be limited on this controller, mark it
3602          * as unaligned if the IO isn't on a 4k boundary (start of length).
3603          */
3604         if (blk_rq_sectors(rq) <= 64) {
3605                 if ((blk_rq_pos(rq) & 7) || (blk_rq_sectors(rq) & 7))
3606                         cmd->unaligned = 1;
3607         }
3608
3609         if (cmd->unaligned && down_trylock(&dd->port->cmd_slot_unal))
3610                 return true;
3611
3612         return false;
3613 }
3614
3615 static blk_status_t mtip_issue_reserved_cmd(struct blk_mq_hw_ctx *hctx,
3616                 struct request *rq)
3617 {
3618         struct driver_data *dd = hctx->queue->queuedata;
3619         struct mtip_int_cmd *icmd = rq->special;
3620         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3621         struct mtip_cmd_sg *command_sg;
3622
3623         if (mtip_commands_active(dd->port))
3624                 return BLK_STS_RESOURCE;
3625
3626         /* Populate the SG list */
3627         cmd->command_header->opts =
3628                  __force_bit2int cpu_to_le32(icmd->opts | icmd->fis_len);
3629         if (icmd->buf_len) {
3630                 command_sg = cmd->command + AHCI_CMD_TBL_HDR_SZ;
3631
3632                 command_sg->info =
3633                         __force_bit2int cpu_to_le32((icmd->buf_len-1) & 0x3FFFFF);
3634                 command_sg->dba =
3635                         __force_bit2int cpu_to_le32(icmd->buffer & 0xFFFFFFFF);
3636                 command_sg->dba_upper =
3637                         __force_bit2int cpu_to_le32((icmd->buffer >> 16) >> 16);
3638
3639                 cmd->command_header->opts |=
3640                         __force_bit2int cpu_to_le32((1 << 16));
3641         }
3642
3643         /* Populate the command header */
3644         cmd->command_header->byte_count = 0;
3645
3646         blk_mq_start_request(rq);
3647         mtip_issue_non_ncq_command(dd->port, rq->tag);
3648         return 0;
3649 }
3650
3651 static blk_status_t mtip_queue_rq(struct blk_mq_hw_ctx *hctx,
3652                          const struct blk_mq_queue_data *bd)
3653 {
3654         struct request *rq = bd->rq;
3655         int ret;
3656
3657         mtip_init_cmd_header(rq);
3658
3659         if (blk_rq_is_passthrough(rq))
3660                 return mtip_issue_reserved_cmd(hctx, rq);
3661
3662         if (unlikely(mtip_check_unal_depth(hctx, rq)))
3663                 return BLK_STS_RESOURCE;
3664
3665         blk_mq_start_request(rq);
3666
3667         ret = mtip_submit_request(hctx, rq);
3668         if (likely(!ret))
3669                 return BLK_STS_OK;
3670         return BLK_STS_IOERR;
3671 }
3672
3673 static void mtip_free_cmd(struct blk_mq_tag_set *set, struct request *rq,
3674                           unsigned int hctx_idx)
3675 {
3676         struct driver_data *dd = set->driver_data;
3677         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3678
3679         if (!cmd->command)
3680                 return;
3681
3682         dmam_free_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
3683                                 cmd->command, cmd->command_dma);
3684 }
3685
3686 static int mtip_init_cmd(struct blk_mq_tag_set *set, struct request *rq,
3687                          unsigned int hctx_idx, unsigned int numa_node)
3688 {
3689         struct driver_data *dd = set->driver_data;
3690         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3691
3692         cmd->command = dmam_alloc_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
3693                         &cmd->command_dma, GFP_KERNEL);
3694         if (!cmd->command)
3695                 return -ENOMEM;
3696
3697         memset(cmd->command, 0, CMD_DMA_ALLOC_SZ);
3698
3699         sg_init_table(cmd->sg, MTIP_MAX_SG);
3700         return 0;
3701 }
3702
3703 static enum blk_eh_timer_return mtip_cmd_timeout(struct request *req,
3704                                                                 bool reserved)
3705 {
3706         struct driver_data *dd = req->q->queuedata;
3707
3708         if (reserved) {
3709                 struct mtip_cmd *cmd = blk_mq_rq_to_pdu(req);
3710
3711                 cmd->status = BLK_STS_TIMEOUT;
3712                 blk_mq_complete_request(req);
3713                 return BLK_EH_DONE;
3714         }
3715
3716         if (test_bit(req->tag, dd->port->cmds_to_issue))
3717                 goto exit_handler;
3718
3719         if (test_and_set_bit(MTIP_PF_TO_ACTIVE_BIT, &dd->port->flags))
3720                 goto exit_handler;
3721
3722         wake_up_interruptible(&dd->port->svc_wait);
3723 exit_handler:
3724         return BLK_EH_RESET_TIMER;
3725 }
3726
3727 static const struct blk_mq_ops mtip_mq_ops = {
3728         .queue_rq       = mtip_queue_rq,
3729         .init_request   = mtip_init_cmd,
3730         .exit_request   = mtip_free_cmd,
3731         .complete       = mtip_softirq_done_fn,
3732         .timeout        = mtip_cmd_timeout,
3733 };
3734
3735 /*
3736  * Block layer initialization function.
3737  *
3738  * This function is called once by the PCI layer for each P320
3739  * device that is connected to the system.
3740  *
3741  * @dd Pointer to the driver data structure.
3742  *
3743  * return value
3744  *      0 on success else an error code.
3745  */
3746 static int mtip_block_initialize(struct driver_data *dd)
3747 {
3748         int rv = 0, wait_for_rebuild = 0;
3749         sector_t capacity;
3750         unsigned int index = 0;
3751         struct kobject *kobj;
3752
3753         if (dd->disk)
3754                 goto skip_create_disk; /* hw init done, before rebuild */
3755
3756         if (mtip_hw_init(dd)) {
3757                 rv = -EINVAL;
3758                 goto protocol_init_error;
3759         }
3760
3761         dd->disk = alloc_disk_node(MTIP_MAX_MINORS, dd->numa_node);
3762         if (dd->disk  == NULL) {
3763                 dev_err(&dd->pdev->dev,
3764                         "Unable to allocate gendisk structure\n");
3765                 rv = -EINVAL;
3766                 goto alloc_disk_error;
3767         }
3768
3769         rv = ida_alloc(&rssd_index_ida, GFP_KERNEL);
3770         if (rv < 0)
3771                 goto ida_get_error;
3772         index = rv;
3773
3774         rv = rssd_disk_name_format("rssd",
3775                                 index,
3776                                 dd->disk->disk_name,
3777                                 DISK_NAME_LEN);
3778         if (rv)
3779                 goto disk_index_error;
3780
3781         dd->disk->major         = dd->major;
3782         dd->disk->first_minor   = index * MTIP_MAX_MINORS;
3783         dd->disk->minors        = MTIP_MAX_MINORS;
3784         dd->disk->fops          = &mtip_block_ops;
3785         dd->disk->private_data  = dd;
3786         dd->index               = index;
3787
3788         mtip_hw_debugfs_init(dd);
3789
3790         memset(&dd->tags, 0, sizeof(dd->tags));
3791         dd->tags.ops = &mtip_mq_ops;
3792         dd->tags.nr_hw_queues = 1;
3793         dd->tags.queue_depth = MTIP_MAX_COMMAND_SLOTS;
3794         dd->tags.reserved_tags = 1;
3795         dd->tags.cmd_size = sizeof(struct mtip_cmd);
3796         dd->tags.numa_node = dd->numa_node;
3797         dd->tags.flags = BLK_MQ_F_SHOULD_MERGE;
3798         dd->tags.driver_data = dd;
3799         dd->tags.timeout = MTIP_NCQ_CMD_TIMEOUT_MS;
3800
3801         rv = blk_mq_alloc_tag_set(&dd->tags);
3802         if (rv) {
3803                 dev_err(&dd->pdev->dev,
3804                         "Unable to allocate request queue\n");
3805                 goto block_queue_alloc_tag_error;
3806         }
3807
3808         /* Allocate the request queue. */
3809         dd->queue = blk_mq_init_queue(&dd->tags);
3810         if (IS_ERR(dd->queue)) {
3811                 dev_err(&dd->pdev->dev,
3812                         "Unable to allocate request queue\n");
3813                 rv = -ENOMEM;
3814                 goto block_queue_alloc_init_error;
3815         }
3816
3817         dd->disk->queue         = dd->queue;
3818         dd->queue->queuedata    = dd;
3819
3820 skip_create_disk:
3821         /* Initialize the protocol layer. */
3822         wait_for_rebuild = mtip_hw_get_identify(dd);
3823         if (wait_for_rebuild < 0) {
3824                 dev_err(&dd->pdev->dev,
3825                         "Protocol layer initialization failed\n");
3826                 rv = -EINVAL;
3827                 goto init_hw_cmds_error;
3828         }
3829
3830         /*
3831          * if rebuild pending, start the service thread, and delay the block
3832          * queue creation and device_add_disk()
3833          */
3834         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3835                 goto start_service_thread;
3836
3837         /* Set device limits. */
3838         blk_queue_flag_set(QUEUE_FLAG_NONROT, dd->queue);
3839         blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, dd->queue);
3840         blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
3841         blk_queue_physical_block_size(dd->queue, 4096);
3842         blk_queue_max_hw_sectors(dd->queue, 0xffff);
3843         blk_queue_max_segment_size(dd->queue, 0x400000);
3844         blk_queue_io_min(dd->queue, 4096);
3845
3846         /* Signal trim support */
3847         if (dd->trim_supp == true) {
3848                 blk_queue_flag_set(QUEUE_FLAG_DISCARD, dd->queue);
3849                 dd->queue->limits.discard_granularity = 4096;
3850                 blk_queue_max_discard_sectors(dd->queue,
3851                         MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES);
3852         }
3853
3854         /* Set the capacity of the device in 512 byte sectors. */
3855         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3856                 dev_warn(&dd->pdev->dev,
3857                         "Could not read drive capacity\n");
3858                 rv = -EIO;
3859                 goto read_capacity_error;
3860         }
3861         set_capacity(dd->disk, capacity);
3862
3863         /* Enable the block device and add it to /dev */
3864         device_add_disk(&dd->pdev->dev, dd->disk);
3865
3866         dd->bdev = bdget_disk(dd->disk, 0);
3867         /*
3868          * Now that the disk is active, initialize any sysfs attributes
3869          * managed by the protocol layer.
3870          */
3871         kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
3872         if (kobj) {
3873                 mtip_hw_sysfs_init(dd, kobj);
3874                 kobject_put(kobj);
3875         }
3876
3877         if (dd->mtip_svc_handler) {
3878                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
3879                 return rv; /* service thread created for handling rebuild */
3880         }
3881
3882 start_service_thread:
3883         dd->mtip_svc_handler = kthread_create_on_node(mtip_service_thread,
3884                                                 dd, dd->numa_node,
3885                                                 "mtip_svc_thd_%02d", index);
3886
3887         if (IS_ERR(dd->mtip_svc_handler)) {
3888                 dev_err(&dd->pdev->dev, "service thread failed to start\n");
3889                 dd->mtip_svc_handler = NULL;
3890                 rv = -EFAULT;
3891                 goto kthread_run_error;
3892         }
3893         wake_up_process(dd->mtip_svc_handler);
3894         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3895                 rv = wait_for_rebuild;
3896
3897         return rv;
3898
3899 kthread_run_error:
3900         bdput(dd->bdev);
3901         dd->bdev = NULL;
3902
3903         /* Delete our gendisk. This also removes the device from /dev */
3904         del_gendisk(dd->disk);
3905
3906 read_capacity_error:
3907 init_hw_cmds_error:
3908         blk_cleanup_queue(dd->queue);
3909 block_queue_alloc_init_error:
3910         blk_mq_free_tag_set(&dd->tags);
3911 block_queue_alloc_tag_error:
3912         mtip_hw_debugfs_exit(dd);
3913 disk_index_error:
3914         ida_free(&rssd_index_ida, index);
3915
3916 ida_get_error:
3917         put_disk(dd->disk);
3918
3919 alloc_disk_error:
3920         mtip_hw_exit(dd); /* De-initialize the protocol layer. */
3921
3922 protocol_init_error:
3923         return rv;
3924 }
3925
3926 static void mtip_no_dev_cleanup(struct request *rq, void *data, bool reserv)
3927 {
3928         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3929
3930         cmd->status = BLK_STS_IOERR;
3931         blk_mq_complete_request(rq);
3932 }
3933
3934 /*
3935  * Block layer deinitialization function.
3936  *
3937  * Called by the PCI layer as each P320 device is removed.
3938  *
3939  * @dd Pointer to the driver data structure.
3940  *
3941  * return value
3942  *      0
3943  */
3944 static int mtip_block_remove(struct driver_data *dd)
3945 {
3946         struct kobject *kobj;
3947
3948         mtip_hw_debugfs_exit(dd);
3949
3950         if (dd->mtip_svc_handler) {
3951                 set_bit(MTIP_PF_SVC_THD_STOP_BIT, &dd->port->flags);
3952                 wake_up_interruptible(&dd->port->svc_wait);
3953                 kthread_stop(dd->mtip_svc_handler);
3954         }
3955
3956         /* Clean up the sysfs attributes, if created */
3957         if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag)) {
3958                 kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
3959                 if (kobj) {
3960                         mtip_hw_sysfs_exit(dd, kobj);
3961                         kobject_put(kobj);
3962                 }
3963         }
3964
3965         if (!dd->sr) {
3966                 /*
3967                  * Explicitly wait here for IOs to quiesce,
3968                  * as mtip_standby_drive usually won't wait for IOs.
3969                  */
3970                 if (!mtip_quiesce_io(dd->port, MTIP_QUIESCE_IO_TIMEOUT_MS))
3971                         mtip_standby_drive(dd);
3972         }
3973         else
3974                 dev_info(&dd->pdev->dev, "device %s surprise removal\n",
3975                                                 dd->disk->disk_name);
3976
3977         blk_freeze_queue_start(dd->queue);
3978         blk_mq_quiesce_queue(dd->queue);
3979         blk_mq_tagset_busy_iter(&dd->tags, mtip_no_dev_cleanup, dd);
3980         blk_mq_unquiesce_queue(dd->queue);
3981
3982         /*
3983          * Delete our gendisk structure. This also removes the device
3984          * from /dev
3985          */
3986         if (dd->bdev) {
3987                 bdput(dd->bdev);
3988                 dd->bdev = NULL;
3989         }
3990         if (dd->disk) {
3991                 if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
3992                         del_gendisk(dd->disk);
3993                 if (dd->disk->queue) {
3994                         blk_cleanup_queue(dd->queue);
3995                         blk_mq_free_tag_set(&dd->tags);
3996                         dd->queue = NULL;
3997                 }
3998                 put_disk(dd->disk);
3999         }
4000         dd->disk  = NULL;
4001
4002         ida_free(&rssd_index_ida, dd->index);
4003
4004         /* De-initialize the protocol layer. */
4005         mtip_hw_exit(dd);
4006
4007         return 0;
4008 }
4009
4010 /*
4011  * Function called by the PCI layer when just before the
4012  * machine shuts down.
4013  *
4014  * If a protocol layer shutdown function is present it will be called
4015  * by this function.
4016  *
4017  * @dd Pointer to the driver data structure.
4018  *
4019  * return value
4020  *      0
4021  */
4022 static int mtip_block_shutdown(struct driver_data *dd)
4023 {
4024         mtip_hw_shutdown(dd);
4025
4026         /* Delete our gendisk structure, and cleanup the blk queue. */
4027         if (dd->disk) {
4028                 dev_info(&dd->pdev->dev,
4029                         "Shutting down %s ...\n", dd->disk->disk_name);
4030
4031                 if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
4032                         del_gendisk(dd->disk);
4033                 if (dd->disk->queue) {
4034                         blk_cleanup_queue(dd->queue);
4035                         blk_mq_free_tag_set(&dd->tags);
4036                 }
4037                 put_disk(dd->disk);
4038                 dd->disk  = NULL;
4039                 dd->queue = NULL;
4040         }
4041
4042         ida_free(&rssd_index_ida, dd->index);
4043         return 0;
4044 }
4045
4046 static int mtip_block_suspend(struct driver_data *dd)
4047 {
4048         dev_info(&dd->pdev->dev,
4049                 "Suspending %s ...\n", dd->disk->disk_name);
4050         mtip_hw_suspend(dd);
4051         return 0;
4052 }
4053
4054 static int mtip_block_resume(struct driver_data *dd)
4055 {
4056         dev_info(&dd->pdev->dev, "Resuming %s ...\n",
4057                 dd->disk->disk_name);
4058         mtip_hw_resume(dd);
4059         return 0;
4060 }
4061
4062 static void drop_cpu(int cpu)
4063 {
4064         cpu_use[cpu]--;
4065 }
4066
4067 static int get_least_used_cpu_on_node(int node)
4068 {
4069         int cpu, least_used_cpu, least_cnt;
4070         const struct cpumask *node_mask;
4071
4072         node_mask = cpumask_of_node(node);
4073         least_used_cpu = cpumask_first(node_mask);
4074         least_cnt = cpu_use[least_used_cpu];
4075         cpu = least_used_cpu;
4076
4077         for_each_cpu(cpu, node_mask) {
4078                 if (cpu_use[cpu] < least_cnt) {
4079                         least_used_cpu = cpu;
4080                         least_cnt = cpu_use[cpu];
4081                 }
4082         }
4083         cpu_use[least_used_cpu]++;
4084         return least_used_cpu;
4085 }
4086
4087 /* Helper for selecting a node in round robin mode */
4088 static inline int mtip_get_next_rr_node(void)
4089 {
4090         static int next_node = -1;
4091
4092         if (next_node == -1) {
4093                 next_node = first_online_node;
4094                 return next_node;
4095         }
4096
4097         next_node = next_online_node(next_node);
4098         if (next_node == MAX_NUMNODES)
4099                 next_node = first_online_node;
4100         return next_node;
4101 }
4102
4103 static DEFINE_HANDLER(0);
4104 static DEFINE_HANDLER(1);
4105 static DEFINE_HANDLER(2);
4106 static DEFINE_HANDLER(3);
4107 static DEFINE_HANDLER(4);
4108 static DEFINE_HANDLER(5);
4109 static DEFINE_HANDLER(6);
4110 static DEFINE_HANDLER(7);
4111
4112 static void mtip_disable_link_opts(struct driver_data *dd, struct pci_dev *pdev)
4113 {
4114         int pos;
4115         unsigned short pcie_dev_ctrl;
4116
4117         pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
4118         if (pos) {
4119                 pci_read_config_word(pdev,
4120                         pos + PCI_EXP_DEVCTL,
4121                         &pcie_dev_ctrl);
4122                 if (pcie_dev_ctrl & (1 << 11) ||
4123                     pcie_dev_ctrl & (1 << 4)) {
4124                         dev_info(&dd->pdev->dev,
4125                                 "Disabling ERO/No-Snoop on bridge device %04x:%04x\n",
4126                                         pdev->vendor, pdev->device);
4127                         pcie_dev_ctrl &= ~(PCI_EXP_DEVCTL_NOSNOOP_EN |
4128                                                 PCI_EXP_DEVCTL_RELAX_EN);
4129                         pci_write_config_word(pdev,
4130                                 pos + PCI_EXP_DEVCTL,
4131                                 pcie_dev_ctrl);
4132                 }
4133         }
4134 }
4135
4136 static void mtip_fix_ero_nosnoop(struct driver_data *dd, struct pci_dev *pdev)
4137 {
4138         /*
4139          * This workaround is specific to AMD/ATI chipset with a PCI upstream
4140          * device with device id 0x5aXX
4141          */
4142         if (pdev->bus && pdev->bus->self) {
4143                 if (pdev->bus->self->vendor == PCI_VENDOR_ID_ATI &&
4144                     ((pdev->bus->self->device & 0xff00) == 0x5a00)) {
4145                         mtip_disable_link_opts(dd, pdev->bus->self);
4146                 } else {
4147                         /* Check further up the topology */
4148                         struct pci_dev *parent_dev = pdev->bus->self;
4149                         if (parent_dev->bus &&
4150                                 parent_dev->bus->parent &&
4151                                 parent_dev->bus->parent->self &&
4152                                 parent_dev->bus->parent->self->vendor ==
4153                                          PCI_VENDOR_ID_ATI &&
4154                                 (parent_dev->bus->parent->self->device &
4155                                         0xff00) == 0x5a00) {
4156                                 mtip_disable_link_opts(dd,
4157                                         parent_dev->bus->parent->self);
4158                         }
4159                 }
4160         }
4161 }
4162
4163 /*
4164  * Called for each supported PCI device detected.
4165  *
4166  * This function allocates the private data structure, enables the
4167  * PCI device and then calls the block layer initialization function.
4168  *
4169  * return value
4170  *      0 on success else an error code.
4171  */
4172 static int mtip_pci_probe(struct pci_dev *pdev,
4173                         const struct pci_device_id *ent)
4174 {
4175         int rv = 0;
4176         struct driver_data *dd = NULL;
4177         char cpu_list[256];
4178         const struct cpumask *node_mask;
4179         int cpu, i = 0, j = 0;
4180         int my_node = NUMA_NO_NODE;
4181         unsigned long flags;
4182
4183         /* Allocate memory for this devices private data. */
4184         my_node = pcibus_to_node(pdev->bus);
4185         if (my_node != NUMA_NO_NODE) {
4186                 if (!node_online(my_node))
4187                         my_node = mtip_get_next_rr_node();
4188         } else {
4189                 dev_info(&pdev->dev, "Kernel not reporting proximity, choosing a node\n");
4190                 my_node = mtip_get_next_rr_node();
4191         }
4192         dev_info(&pdev->dev, "NUMA node %d (closest: %d,%d, probe on %d:%d)\n",
4193                 my_node, pcibus_to_node(pdev->bus), dev_to_node(&pdev->dev),
4194                 cpu_to_node(raw_smp_processor_id()), raw_smp_processor_id());
4195
4196         dd = kzalloc_node(sizeof(struct driver_data), GFP_KERNEL, my_node);
4197         if (dd == NULL) {
4198                 dev_err(&pdev->dev,
4199                         "Unable to allocate memory for driver data\n");
4200                 return -ENOMEM;
4201         }
4202
4203         /* Attach the private data to this PCI device.  */
4204         pci_set_drvdata(pdev, dd);
4205
4206         rv = pcim_enable_device(pdev);
4207         if (rv < 0) {
4208                 dev_err(&pdev->dev, "Unable to enable device\n");
4209                 goto iomap_err;
4210         }
4211
4212         /* Map BAR5 to memory. */
4213         rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME);
4214         if (rv < 0) {
4215                 dev_err(&pdev->dev, "Unable to map regions\n");
4216                 goto iomap_err;
4217         }
4218
4219         if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
4220                 rv = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
4221
4222                 if (rv) {
4223                         rv = pci_set_consistent_dma_mask(pdev,
4224                                                 DMA_BIT_MASK(32));
4225                         if (rv) {
4226                                 dev_warn(&pdev->dev,
4227                                         "64-bit DMA enable failed\n");
4228                                 goto setmask_err;
4229                         }
4230                 }
4231         }
4232
4233         /* Copy the info we may need later into the private data structure. */
4234         dd->major       = mtip_major;
4235         dd->instance    = instance;
4236         dd->pdev        = pdev;
4237         dd->numa_node   = my_node;
4238
4239         INIT_LIST_HEAD(&dd->online_list);
4240         INIT_LIST_HEAD(&dd->remove_list);
4241
4242         memset(dd->workq_name, 0, 32);
4243         snprintf(dd->workq_name, 31, "mtipq%d", dd->instance);
4244
4245         dd->isr_workq = create_workqueue(dd->workq_name);
4246         if (!dd->isr_workq) {
4247                 dev_warn(&pdev->dev, "Can't create wq %d\n", dd->instance);
4248                 rv = -ENOMEM;
4249                 goto setmask_err;
4250         }
4251
4252         memset(cpu_list, 0, sizeof(cpu_list));
4253
4254         node_mask = cpumask_of_node(dd->numa_node);
4255         if (!cpumask_empty(node_mask)) {
4256                 for_each_cpu(cpu, node_mask)
4257                 {
4258                         snprintf(&cpu_list[j], 256 - j, "%d ", cpu);
4259                         j = strlen(cpu_list);
4260                 }
4261
4262                 dev_info(&pdev->dev, "Node %d on package %d has %d cpu(s): %s\n",
4263                         dd->numa_node,
4264                         topology_physical_package_id(cpumask_first(node_mask)),
4265                         nr_cpus_node(dd->numa_node),
4266                         cpu_list);
4267         } else
4268                 dev_dbg(&pdev->dev, "mtip32xx: node_mask empty\n");
4269
4270         dd->isr_binding = get_least_used_cpu_on_node(dd->numa_node);
4271         dev_info(&pdev->dev, "Initial IRQ binding node:cpu %d:%d\n",
4272                 cpu_to_node(dd->isr_binding), dd->isr_binding);
4273
4274         /* first worker context always runs in ISR */
4275         dd->work[0].cpu_binding = dd->isr_binding;
4276         dd->work[1].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4277         dd->work[2].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4278         dd->work[3].cpu_binding = dd->work[0].cpu_binding;
4279         dd->work[4].cpu_binding = dd->work[1].cpu_binding;
4280         dd->work[5].cpu_binding = dd->work[2].cpu_binding;
4281         dd->work[6].cpu_binding = dd->work[2].cpu_binding;
4282         dd->work[7].cpu_binding = dd->work[1].cpu_binding;
4283
4284         /* Log the bindings */
4285         for_each_present_cpu(cpu) {
4286                 memset(cpu_list, 0, sizeof(cpu_list));
4287                 for (i = 0, j = 0; i < MTIP_MAX_SLOT_GROUPS; i++) {
4288                         if (dd->work[i].cpu_binding == cpu) {
4289                                 snprintf(&cpu_list[j], 256 - j, "%d ", i);
4290                                 j = strlen(cpu_list);
4291                         }
4292                 }
4293                 if (j)
4294                         dev_info(&pdev->dev, "CPU %d: WQs %s\n", cpu, cpu_list);
4295         }
4296
4297         INIT_WORK(&dd->work[0].work, mtip_workq_sdbf0);
4298         INIT_WORK(&dd->work[1].work, mtip_workq_sdbf1);
4299         INIT_WORK(&dd->work[2].work, mtip_workq_sdbf2);
4300         INIT_WORK(&dd->work[3].work, mtip_workq_sdbf3);
4301         INIT_WORK(&dd->work[4].work, mtip_workq_sdbf4);
4302         INIT_WORK(&dd->work[5].work, mtip_workq_sdbf5);
4303         INIT_WORK(&dd->work[6].work, mtip_workq_sdbf6);
4304         INIT_WORK(&dd->work[7].work, mtip_workq_sdbf7);
4305
4306         pci_set_master(pdev);
4307         rv = pci_enable_msi(pdev);
4308         if (rv) {
4309                 dev_warn(&pdev->dev,
4310                         "Unable to enable MSI interrupt.\n");
4311                 goto msi_initialize_err;
4312         }
4313
4314         mtip_fix_ero_nosnoop(dd, pdev);
4315
4316         /* Initialize the block layer. */
4317         rv = mtip_block_initialize(dd);
4318         if (rv < 0) {
4319                 dev_err(&pdev->dev,
4320                         "Unable to initialize block layer\n");
4321                 goto block_initialize_err;
4322         }
4323
4324         /*
4325          * Increment the instance count so that each device has a unique
4326          * instance number.
4327          */
4328         instance++;
4329         if (rv != MTIP_FTL_REBUILD_MAGIC)
4330                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4331         else
4332                 rv = 0; /* device in rebuild state, return 0 from probe */
4333
4334         /* Add to online list even if in ftl rebuild */
4335         spin_lock_irqsave(&dev_lock, flags);
4336         list_add(&dd->online_list, &online_list);
4337         spin_unlock_irqrestore(&dev_lock, flags);
4338
4339         goto done;
4340
4341 block_initialize_err:
4342         pci_disable_msi(pdev);
4343
4344 msi_initialize_err:
4345         if (dd->isr_workq) {
4346                 flush_workqueue(dd->isr_workq);
4347                 destroy_workqueue(dd->isr_workq);
4348                 drop_cpu(dd->work[0].cpu_binding);
4349                 drop_cpu(dd->work[1].cpu_binding);
4350                 drop_cpu(dd->work[2].cpu_binding);
4351         }
4352 setmask_err:
4353         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4354
4355 iomap_err:
4356         kfree(dd);
4357         pci_set_drvdata(pdev, NULL);
4358         return rv;
4359 done:
4360         return rv;
4361 }
4362
4363 /*
4364  * Called for each probed device when the device is removed or the
4365  * driver is unloaded.
4366  *
4367  * return value
4368  *      None
4369  */
4370 static void mtip_pci_remove(struct pci_dev *pdev)
4371 {
4372         struct driver_data *dd = pci_get_drvdata(pdev);
4373         unsigned long flags, to;
4374
4375         set_bit(MTIP_DDF_REMOVAL_BIT, &dd->dd_flag);
4376
4377         spin_lock_irqsave(&dev_lock, flags);
4378         list_del_init(&dd->online_list);
4379         list_add(&dd->remove_list, &removing_list);
4380         spin_unlock_irqrestore(&dev_lock, flags);
4381
4382         mtip_check_surprise_removal(pdev);
4383         synchronize_irq(dd->pdev->irq);
4384
4385         /* Spin until workers are done */
4386         to = jiffies + msecs_to_jiffies(4000);
4387         do {
4388                 msleep(20);
4389         } while (atomic_read(&dd->irq_workers_active) != 0 &&
4390                 time_before(jiffies, to));
4391
4392         if (!dd->sr)
4393                 fsync_bdev(dd->bdev);
4394
4395         if (atomic_read(&dd->irq_workers_active) != 0) {
4396                 dev_warn(&dd->pdev->dev,
4397                         "Completion workers still active!\n");
4398         }
4399
4400         blk_set_queue_dying(dd->queue);
4401         set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
4402
4403         /* Clean up the block layer. */
4404         mtip_block_remove(dd);
4405
4406         if (dd->isr_workq) {
4407                 flush_workqueue(dd->isr_workq);
4408                 destroy_workqueue(dd->isr_workq);
4409                 drop_cpu(dd->work[0].cpu_binding);
4410                 drop_cpu(dd->work[1].cpu_binding);
4411                 drop_cpu(dd->work[2].cpu_binding);
4412         }
4413
4414         pci_disable_msi(pdev);
4415
4416         spin_lock_irqsave(&dev_lock, flags);
4417         list_del_init(&dd->remove_list);
4418         spin_unlock_irqrestore(&dev_lock, flags);
4419
4420         kfree(dd);
4421
4422         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4423         pci_set_drvdata(pdev, NULL);
4424 }
4425
4426 /*
4427  * Called for each probed device when the device is suspended.
4428  *
4429  * return value
4430  *      0  Success
4431  *      <0 Error
4432  */
4433 static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
4434 {
4435         int rv = 0;
4436         struct driver_data *dd = pci_get_drvdata(pdev);
4437
4438         if (!dd) {
4439                 dev_err(&pdev->dev,
4440                         "Driver private datastructure is NULL\n");
4441                 return -EFAULT;
4442         }
4443
4444         set_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4445
4446         /* Disable ports & interrupts then send standby immediate */
4447         rv = mtip_block_suspend(dd);
4448         if (rv < 0) {
4449                 dev_err(&pdev->dev,
4450                         "Failed to suspend controller\n");
4451                 return rv;
4452         }
4453
4454         /*
4455          * Save the pci config space to pdev structure &
4456          * disable the device
4457          */
4458         pci_save_state(pdev);
4459         pci_disable_device(pdev);
4460
4461         /* Move to Low power state*/
4462         pci_set_power_state(pdev, PCI_D3hot);
4463
4464         return rv;
4465 }
4466
4467 /*
4468  * Called for each probed device when the device is resumed.
4469  *
4470  * return value
4471  *      0  Success
4472  *      <0 Error
4473  */
4474 static int mtip_pci_resume(struct pci_dev *pdev)
4475 {
4476         int rv = 0;
4477         struct driver_data *dd;
4478
4479         dd = pci_get_drvdata(pdev);
4480         if (!dd) {
4481                 dev_err(&pdev->dev,
4482                         "Driver private datastructure is NULL\n");
4483                 return -EFAULT;
4484         }
4485
4486         /* Move the device to active State */
4487         pci_set_power_state(pdev, PCI_D0);
4488
4489         /* Restore PCI configuration space */
4490         pci_restore_state(pdev);
4491
4492         /* Enable the PCI device*/
4493         rv = pcim_enable_device(pdev);
4494         if (rv < 0) {
4495                 dev_err(&pdev->dev,
4496                         "Failed to enable card during resume\n");
4497                 goto err;
4498         }
4499         pci_set_master(pdev);
4500
4501         /*
4502          * Calls hbaReset, initPort, & startPort function
4503          * then enables interrupts
4504          */
4505         rv = mtip_block_resume(dd);
4506         if (rv < 0)
4507                 dev_err(&pdev->dev, "Unable to resume\n");
4508
4509 err:
4510         clear_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4511
4512         return rv;
4513 }
4514
4515 /*
4516  * Shutdown routine
4517  *
4518  * return value
4519  *      None
4520  */
4521 static void mtip_pci_shutdown(struct pci_dev *pdev)
4522 {
4523         struct driver_data *dd = pci_get_drvdata(pdev);
4524         if (dd)
4525                 mtip_block_shutdown(dd);
4526 }
4527
4528 /* Table of device ids supported by this driver. */
4529 static const struct pci_device_id mtip_pci_tbl[] = {
4530         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320H_DEVICE_ID) },
4531         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320M_DEVICE_ID) },
4532         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320S_DEVICE_ID) },
4533         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P325M_DEVICE_ID) },
4534         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420H_DEVICE_ID) },
4535         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420M_DEVICE_ID) },
4536         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P425M_DEVICE_ID) },
4537         { 0 }
4538 };
4539
4540 /* Structure that describes the PCI driver functions. */
4541 static struct pci_driver mtip_pci_driver = {
4542         .name                   = MTIP_DRV_NAME,
4543         .id_table               = mtip_pci_tbl,
4544         .probe                  = mtip_pci_probe,
4545         .remove                 = mtip_pci_remove,
4546         .suspend                = mtip_pci_suspend,
4547         .resume                 = mtip_pci_resume,
4548         .shutdown               = mtip_pci_shutdown,
4549 };
4550
4551 MODULE_DEVICE_TABLE(pci, mtip_pci_tbl);
4552
4553 /*
4554  * Module initialization function.
4555  *
4556  * Called once when the module is loaded. This function allocates a major
4557  * block device number to the Cyclone devices and registers the PCI layer
4558  * of the driver.
4559  *
4560  * Return value
4561  *      0 on success else error code.
4562  */
4563 static int __init mtip_init(void)
4564 {
4565         int error;
4566
4567         pr_info(MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n");
4568
4569         spin_lock_init(&dev_lock);
4570
4571         INIT_LIST_HEAD(&online_list);
4572         INIT_LIST_HEAD(&removing_list);
4573
4574         /* Allocate a major block device number to use with this driver. */
4575         error = register_blkdev(0, MTIP_DRV_NAME);
4576         if (error <= 0) {
4577                 pr_err("Unable to register block device (%d)\n",
4578                 error);
4579                 return -EBUSY;
4580         }
4581         mtip_major = error;
4582
4583         dfs_parent = debugfs_create_dir("rssd", NULL);
4584         if (IS_ERR_OR_NULL(dfs_parent)) {
4585                 pr_warn("Error creating debugfs parent\n");
4586                 dfs_parent = NULL;
4587         }
4588         if (dfs_parent) {
4589                 dfs_device_status = debugfs_create_file("device_status",
4590                                         0444, dfs_parent, NULL,
4591                                         &mtip_device_status_fops);
4592                 if (IS_ERR_OR_NULL(dfs_device_status)) {
4593                         pr_err("Error creating device_status node\n");
4594                         dfs_device_status = NULL;
4595                 }
4596         }
4597
4598         /* Register our PCI operations. */
4599         error = pci_register_driver(&mtip_pci_driver);
4600         if (error) {
4601                 debugfs_remove(dfs_parent);
4602                 unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4603         }
4604
4605         return error;
4606 }
4607
4608 /*
4609  * Module de-initialization function.
4610  *
4611  * Called once when the module is unloaded. This function deallocates
4612  * the major block device number allocated by mtip_init() and
4613  * unregisters the PCI layer of the driver.
4614  *
4615  * Return value
4616  *      none
4617  */
4618 static void __exit mtip_exit(void)
4619 {
4620         /* Release the allocated major block device number. */
4621         unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4622
4623         /* Unregister the PCI driver. */
4624         pci_unregister_driver(&mtip_pci_driver);
4625
4626         debugfs_remove_recursive(dfs_parent);
4627 }
4628
4629 MODULE_AUTHOR("Micron Technology, Inc");
4630 MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
4631 MODULE_LICENSE("GPL");
4632 MODULE_VERSION(MTIP_DRV_VERSION);
4633
4634 module_init(mtip_init);
4635 module_exit(mtip_exit);