drivers/block/mtip32xx/mtip32xx.c

   1 /*
   2  * Driver for the Micron P320 SSD
   3  *   Copyright (C) 2011 Micron Technology, Inc.
   4  *
   5  * Portions of this code were derived from works subjected to the
   6  * following copyright:
   7  *    Copyright (C) 2009 Integrated Device Technology, Inc.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  */
  20
  21 #include <linux/pci.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/ata.h>
  24 #include <linux/delay.h>
  25 #include <linux/hdreg.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/random.h>
  28 #include <linux/smp.h>
  29 #include <linux/compat.h>
  30 #include <linux/fs.h>
  31 #include <linux/module.h>
  32 #include <linux/genhd.h>
  33 #include <linux/blkdev.h>
  34 #include <linux/blk-mq.h>
  35 #include <linux/bio.h>
  36 #include <linux/dma-mapping.h>
  37 #include <linux/idr.h>
  38 #include <linux/kthread.h>
  39 #include <../drivers/ata/ahci.h>
  40 #include <linux/export.h>
  41 #include <linux/debugfs.h>
  42 #include <linux/prefetch.h>
  43 #include "mtip32xx.h"
  44
  45 #define HW_CMD_SLOT_SZ          (MTIP_MAX_COMMAND_SLOTS * 32)
  46
  47 /* DMA region containing RX Fis, Identify, RLE10, and SMART buffers */
  48 #define AHCI_RX_FIS_SZ          0x100
  49 #define AHCI_RX_FIS_OFFSET      0x0
  50 #define AHCI_IDFY_SZ            ATA_SECT_SIZE
  51 #define AHCI_IDFY_OFFSET        0x400
  52 #define AHCI_SECTBUF_SZ         ATA_SECT_SIZE
  53 #define AHCI_SECTBUF_OFFSET     0x800
  54 #define AHCI_SMARTBUF_SZ        ATA_SECT_SIZE
  55 #define AHCI_SMARTBUF_OFFSET    0xC00
  56 /* 0x100 + 0x200 + 0x200 + 0x200 is smaller than 4k but we pad it out */
  57 #define BLOCK_DMA_ALLOC_SZ      4096
  58
  59 /* DMA region containing command table (should be 8192 bytes) */
  60 #define AHCI_CMD_SLOT_SZ        sizeof(struct mtip_cmd_hdr)
  61 #define AHCI_CMD_TBL_SZ         (MTIP_MAX_COMMAND_SLOTS * AHCI_CMD_SLOT_SZ)
  62 #define AHCI_CMD_TBL_OFFSET     0x0
  63
  64 /* DMA region per command (contains header and SGL) */
  65 #define AHCI_CMD_TBL_HDR_SZ     0x80
  66 #define AHCI_CMD_TBL_HDR_OFFSET 0x0
  67 #define AHCI_CMD_TBL_SGL_SZ     (MTIP_MAX_SG * sizeof(struct mtip_cmd_sg))
  68 #define AHCI_CMD_TBL_SGL_OFFSET AHCI_CMD_TBL_HDR_SZ
  69 #define CMD_DMA_ALLOC_SZ        (AHCI_CMD_TBL_SGL_SZ + AHCI_CMD_TBL_HDR_SZ)
  70
  71
  72 #define HOST_CAP_NZDMA          (1 << 19)
  73 #define HOST_HSORG              0xFC
  74 #define HSORG_DISABLE_SLOTGRP_INTR (1<<24)
  75 #define HSORG_DISABLE_SLOTGRP_PXIS (1<<16)
  76 #define HSORG_HWREV             0xFF00
  77 #define HSORG_STYLE             0x8
  78 #define HSORG_SLOTGROUPS        0x7
  79
  80 #define PORT_COMMAND_ISSUE      0x38
  81 #define PORT_SDBV               0x7C
  82
  83 #define PORT_OFFSET             0x100
  84 #define PORT_MEM_SIZE           0x80
  85
  86 #define PORT_IRQ_ERR \
  87         (PORT_IRQ_HBUS_ERR | PORT_IRQ_IF_ERR | PORT_IRQ_CONNECT | \
  88          PORT_IRQ_PHYRDY | PORT_IRQ_UNK_FIS | PORT_IRQ_BAD_PMP | \
  89          PORT_IRQ_TF_ERR | PORT_IRQ_HBUS_DATA_ERR | PORT_IRQ_IF_NONFATAL | \
  90          PORT_IRQ_OVERFLOW)
  91 #define PORT_IRQ_LEGACY \
  92         (PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS)
  93 #define PORT_IRQ_HANDLED \
  94         (PORT_IRQ_SDB_FIS | PORT_IRQ_LEGACY | \
  95          PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR | \
  96          PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)
  97 #define DEF_PORT_IRQ \
  98         (PORT_IRQ_ERR | PORT_IRQ_LEGACY | PORT_IRQ_SDB_FIS)
  99
 100 /* product numbers */
 101 #define MTIP_PRODUCT_UNKNOWN    0x00
 102 #define MTIP_PRODUCT_ASICFPGA   0x11
 103
 104 /* Device instance number, incremented each time a device is probed. */
 105 static int instance;
 106
 107 static struct list_head online_list;
 108 static struct list_head removing_list;
 109 static spinlock_t dev_lock;
 110
 111 /*
 112  * Global variable used to hold the major block device number
 113  * allocated in mtip_init().
 114  */
 115 static int mtip_major;
 116 static struct dentry *dfs_parent;
 117 static struct dentry *dfs_device_status;
 118
 119 static u32 cpu_use[NR_CPUS];
 120
 121 static DEFINE_SPINLOCK(rssd_index_lock);
 122 static DEFINE_IDA(rssd_index_ida);
 123
 124 static int mtip_block_initialize(struct driver_data *dd);
 125
 126 #ifdef CONFIG_COMPAT
 127 struct mtip_compat_ide_task_request_s {
 128         __u8            io_ports[8];
 129         __u8            hob_ports[8];
 130         ide_reg_valid_t out_flags;
 131         ide_reg_valid_t in_flags;
 132         int             data_phase;
 133         int             req_cmd;
 134         compat_ulong_t  out_size;
 135         compat_ulong_t  in_size;
 136 };
 137 #endif
 138
 139 /*
 140  * This function check_for_surprise_removal is called
 141  * while card is removed from the system and it will
 142  * read the vendor id from the configration space
 143  *
 144  * @pdev Pointer to the pci_dev structure.
 145  *
 146  * return value
 147  *       true if device removed, else false
 148  */
 149 static bool mtip_check_surprise_removal(struct pci_dev *pdev)
 150 {
 151         u16 vendor_id = 0;
 152         struct driver_data *dd = pci_get_drvdata(pdev);
 153
 154         if (dd->sr)
 155                 return true;
 156
 157        /* Read the vendorID from the configuration space */
 158         pci_read_config_word(pdev, 0x00, &vendor_id);
 159         if (vendor_id == 0xFFFF) {
 160                 dd->sr = true;
 161                 if (dd->queue)
 162                         blk_queue_flag_set(QUEUE_FLAG_DEAD, dd->queue);
 163                 else
 164                         dev_warn(&dd->pdev->dev,
 165                                 "%s: dd->queue is NULL\n", __func__);
 166                 return true; /* device removed */
 167         }
 168
 169         return false; /* device present */
 170 }
 171
 172 /* we have to use runtime tag to setup command header */
 173 static void mtip_init_cmd_header(struct request *rq)
 174 {
 175         struct driver_data *dd = rq->q->queuedata;
 176         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
 177
 178         /* Point the command headers at the command tables. */
 179         cmd->command_header = dd->port->command_list +
 180                                 (sizeof(struct mtip_cmd_hdr) * rq->tag);
 181         cmd->command_header_dma = dd->port->command_list_dma +
 182                                 (sizeof(struct mtip_cmd_hdr) * rq->tag);
 183
 184         if (test_bit(MTIP_PF_HOST_CAP_64, &dd->port->flags))
 185                 cmd->command_header->ctbau = __force_bit2int cpu_to_le32((cmd->command_dma >> 16) >> 16);
 186
 187         cmd->command_header->ctba = __force_bit2int cpu_to_le32(cmd->command_dma & 0xFFFFFFFF);
 188 }
 189
 190 static struct mtip_cmd *mtip_get_int_command(struct driver_data *dd)
 191 {
 192         struct request *rq;
 193
 194         if (mtip_check_surprise_removal(dd->pdev))
 195                 return NULL;
 196
 197         rq = blk_mq_alloc_request(dd->queue, REQ_OP_DRV_IN, BLK_MQ_REQ_RESERVED);
 198         if (IS_ERR(rq))
 199                 return NULL;
 200
 201         /* Internal cmd isn't submitted via .queue_rq */
 202         mtip_init_cmd_header(rq);
 203
 204         return blk_mq_rq_to_pdu(rq);
 205 }
 206
 207 static struct mtip_cmd *mtip_cmd_from_tag(struct driver_data *dd,
 208                                           unsigned int tag)
 209 {
 210         struct blk_mq_hw_ctx *hctx = dd->queue->queue_hw_ctx[0];
 211
 212         return blk_mq_rq_to_pdu(blk_mq_tag_to_rq(hctx->tags, tag));
 213 }
 214
 215 /*
 216  * Reset the HBA (without sleeping)
 217  *
 218  * @dd Pointer to the driver data structure.
 219  *
 220  * return value
 221  *      0       The reset was successful.
 222  *      -1      The HBA Reset bit did not clear.
 223  */
 224 static int mtip_hba_reset(struct driver_data *dd)
 225 {
 226         unsigned long timeout;
 227
 228         /* Set the reset bit */
 229         writel(HOST_RESET, dd->mmio + HOST_CTL);
 230
 231         /* Flush */
 232         readl(dd->mmio + HOST_CTL);
 233
 234         /*
 235          * Spin for up to 10 seconds waiting for reset acknowledgement. Spec
 236          * is 1 sec but in LUN failure conditions, up to 10 secs are required
 237          */
 238         timeout = jiffies + msecs_to_jiffies(10000);
 239         do {
 240                 mdelay(10);
 241                 if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))
 242                         return -1;
 243
 244         } while ((readl(dd->mmio + HOST_CTL) & HOST_RESET)
 245                  && time_before(jiffies, timeout));
 246
 247         if (readl(dd->mmio + HOST_CTL) & HOST_RESET)
 248                 return -1;
 249
 250         return 0;
 251 }
 252
 253 /*
 254  * Issue a command to the hardware.
 255  *
 256  * Set the appropriate bit in the s_active and Command Issue hardware
 257  * registers, causing hardware command processing to begin.
 258  *
 259  * @port Pointer to the port structure.
 260  * @tag  The tag of the command to be issued.
 261  *
 262  * return value
 263  *      None
 264  */
 265 static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag)
 266 {
 267         int group = tag >> 5;
 268
 269         /* guard SACT and CI registers */
 270         spin_lock(&port->cmd_issue_lock[group]);
 271         writel((1 << MTIP_TAG_BIT(tag)),
 272                         port->s_active[MTIP_TAG_INDEX(tag)]);
 273         writel((1 << MTIP_TAG_BIT(tag)),
 274                         port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 275         spin_unlock(&port->cmd_issue_lock[group]);
 276 }
 277
 278 /*
 279  * Enable/disable the reception of FIS
 280  *
 281  * @port   Pointer to the port data structure
 282  * @enable 1 to enable, 0 to disable
 283  *
 284  * return value
 285  *      Previous state: 1 enabled, 0 disabled
 286  */
 287 static int mtip_enable_fis(struct mtip_port *port, int enable)
 288 {
 289         u32 tmp;
 290
 291         /* enable FIS reception */
 292         tmp = readl(port->mmio + PORT_CMD);
 293         if (enable)
 294                 writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 295         else
 296                 writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 297
 298         /* Flush */
 299         readl(port->mmio + PORT_CMD);
 300
 301         return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX));
 302 }
 303
 304 /*
 305  * Enable/disable the DMA engine
 306  *
 307  * @port   Pointer to the port data structure
 308  * @enable 1 to enable, 0 to disable
 309  *
 310  * return value
 311  *      Previous state: 1 enabled, 0 disabled.
 312  */
 313 static int mtip_enable_engine(struct mtip_port *port, int enable)
 314 {
 315         u32 tmp;
 316
 317         /* enable FIS reception */
 318         tmp = readl(port->mmio + PORT_CMD);
 319         if (enable)
 320                 writel(tmp | PORT_CMD_START, port->mmio + PORT_CMD);
 321         else
 322                 writel(tmp & ~PORT_CMD_START, port->mmio + PORT_CMD);
 323
 324         readl(port->mmio + PORT_CMD);
 325         return (((tmp & PORT_CMD_START) == PORT_CMD_START));
 326 }
 327
 328 /*
 329  * Enables the port DMA engine and FIS reception.
 330  *
 331  * return value
 332  *      None
 333  */
 334 static inline void mtip_start_port(struct mtip_port *port)
 335 {
 336         /* Enable FIS reception */
 337         mtip_enable_fis(port, 1);
 338
 339         /* Enable the DMA engine */
 340         mtip_enable_engine(port, 1);
 341 }
 342
 343 /*
 344  * Deinitialize a port by disabling port interrupts, the DMA engine,
 345  * and FIS reception.
 346  *
 347  * @port Pointer to the port structure
 348  *
 349  * return value
 350  *      None
 351  */
 352 static inline void mtip_deinit_port(struct mtip_port *port)
 353 {
 354         /* Disable interrupts on this port */
 355         writel(0, port->mmio + PORT_IRQ_MASK);
 356
 357         /* Disable the DMA engine */
 358         mtip_enable_engine(port, 0);
 359
 360         /* Disable FIS reception */
 361         mtip_enable_fis(port, 0);
 362 }
 363
 364 /*
 365  * Initialize a port.
 366  *
 367  * This function deinitializes the port by calling mtip_deinit_port() and
 368  * then initializes it by setting the command header and RX FIS addresses,
 369  * clearing the SError register and any pending port interrupts before
 370  * re-enabling the default set of port interrupts.
 371  *
 372  * @port Pointer to the port structure.
 373  *
 374  * return value
 375  *      None
 376  */
 377 static void mtip_init_port(struct mtip_port *port)
 378 {
 379         int i;
 380         mtip_deinit_port(port);
 381
 382         /* Program the command list base and FIS base addresses */
 383         if (readl(port->dd->mmio + HOST_CAP) & HOST_CAP_64) {
 384                 writel((port->command_list_dma >> 16) >> 16,
 385                          port->mmio + PORT_LST_ADDR_HI);
 386                 writel((port->rxfis_dma >> 16) >> 16,
 387                          port->mmio + PORT_FIS_ADDR_HI);
 388                 set_bit(MTIP_PF_HOST_CAP_64, &port->flags);
 389         }
 390
 391         writel(port->command_list_dma & 0xFFFFFFFF,
 392                         port->mmio + PORT_LST_ADDR);
 393         writel(port->rxfis_dma & 0xFFFFFFFF, port->mmio + PORT_FIS_ADDR);
 394
 395         /* Clear SError */
 396         writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);
 397
 398         /* reset the completed registers.*/
 399         for (i = 0; i < port->dd->slot_groups; i++)
 400                 writel(0xFFFFFFFF, port->completed[i]);
 401
 402         /* Clear any pending interrupts for this port */
 403         writel(readl(port->mmio + PORT_IRQ_STAT), port->mmio + PORT_IRQ_STAT);
 404
 405         /* Clear any pending interrupts on the HBA. */
 406         writel(readl(port->dd->mmio + HOST_IRQ_STAT),
 407                                         port->dd->mmio + HOST_IRQ_STAT);
 408
 409         /* Enable port interrupts */
 410         writel(DEF_PORT_IRQ, port->mmio + PORT_IRQ_MASK);
 411 }
 412
 413 /*
 414  * Restart a port
 415  *
 416  * @port Pointer to the port data structure.
 417  *
 418  * return value
 419  *      None
 420  */
 421 static void mtip_restart_port(struct mtip_port *port)
 422 {
 423         unsigned long timeout;
 424
 425         /* Disable the DMA engine */
 426         mtip_enable_engine(port, 0);
 427
 428         /* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */
 429         timeout = jiffies + msecs_to_jiffies(500);
 430         while ((readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON)
 431                  && time_before(jiffies, timeout))
 432                 ;
 433
 434         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 435                 return;
 436
 437         /*
 438          * Chip quirk: escalate to hba reset if
 439          * PxCMD.CR not clear after 500 ms
 440          */
 441         if (readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) {
 442                 dev_warn(&port->dd->pdev->dev,
 443                         "PxCMD.CR not clear, escalating reset\n");
 444
 445                 if (mtip_hba_reset(port->dd))
 446                         dev_err(&port->dd->pdev->dev,
 447                                 "HBA reset escalation failed.\n");
 448
 449                 /* 30 ms delay before com reset to quiesce chip */
 450                 mdelay(30);
 451         }
 452
 453         dev_warn(&port->dd->pdev->dev, "Issuing COM reset\n");
 454
 455         /* Set PxSCTL.DET */
 456         writel(readl(port->mmio + PORT_SCR_CTL) |
 457                          1, port->mmio + PORT_SCR_CTL);
 458         readl(port->mmio + PORT_SCR_CTL);
 459
 460         /* Wait 1 ms to quiesce chip function */
 461         timeout = jiffies + msecs_to_jiffies(1);
 462         while (time_before(jiffies, timeout))
 463                 ;
 464
 465         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 466                 return;
 467
 468         /* Clear PxSCTL.DET */
 469         writel(readl(port->mmio + PORT_SCR_CTL) & ~1,
 470                          port->mmio + PORT_SCR_CTL);
 471         readl(port->mmio + PORT_SCR_CTL);
 472
 473         /* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */
 474         timeout = jiffies + msecs_to_jiffies(500);
 475         while (((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 476                          && time_before(jiffies, timeout))
 477                 ;
 478
 479         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 480                 return;
 481
 482         if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 483                 dev_warn(&port->dd->pdev->dev,
 484                         "COM reset failed\n");
 485
 486         mtip_init_port(port);
 487         mtip_start_port(port);
 488
 489 }
 490
 491 static int mtip_device_reset(struct driver_data *dd)
 492 {
 493         int rv = 0;
 494
 495         if (mtip_check_surprise_removal(dd->pdev))
 496                 return 0;
 497
 498         if (mtip_hba_reset(dd) < 0)
 499                 rv = -EFAULT;
 500
 501         mdelay(1);
 502         mtip_init_port(dd->port);
 503         mtip_start_port(dd->port);
 504
 505         /* Enable interrupts on the HBA. */
 506         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
 507                                         dd->mmio + HOST_CTL);
 508         return rv;
 509 }
 510
 511 /*
 512  * Helper function for tag logging
 513  */
 514 static void print_tags(struct driver_data *dd,
 515                         char *msg,
 516                         unsigned long *tagbits,
 517                         int cnt)
 518 {
 519         unsigned char tagmap[128];
 520         int group, tagmap_len = 0;
 521
 522         memset(tagmap, 0, sizeof(tagmap));
 523         for (group = SLOTBITS_IN_LONGS; group > 0; group--)
 524                 tagmap_len += sprintf(tagmap + tagmap_len, "%016lX ",
 525                                                 tagbits[group-1]);
 526         dev_warn(&dd->pdev->dev,
 527                         "%d command(s) %s: tagmap [%s]", cnt, msg, tagmap);
 528 }
 529
 530 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
 531                                 dma_addr_t buffer_dma, unsigned int sectors);
 532 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
 533                                                 struct smart_attr *attrib);
 534
 535 static void mtip_complete_command(struct mtip_cmd *cmd, blk_status_t status)
 536 {
 537         struct request *req = blk_mq_rq_from_pdu(cmd);
 538
 539         cmd->status = status;
 540         blk_mq_complete_request(req);
 541 }
 542
 543 /*
 544  * Handle an error.
 545  *
 546  * @dd Pointer to the DRIVER_DATA structure.
 547  *
 548  * return value
 549  *      None
 550  */
 551 static void mtip_handle_tfe(struct driver_data *dd)
 552 {
 553         int group, tag, bit, reissue, rv;
 554         struct mtip_port *port;
 555         struct mtip_cmd  *cmd;
 556         u32 completed;
 557         struct host_to_dev_fis *fis;
 558         unsigned long tagaccum[SLOTBITS_IN_LONGS];
 559         unsigned int cmd_cnt = 0;
 560         unsigned char *buf;
 561         char *fail_reason = NULL;
 562         int fail_all_ncq_write = 0, fail_all_ncq_cmds = 0;
 563
 564         dev_warn(&dd->pdev->dev, "Taskfile error\n");
 565
 566         port = dd->port;
 567
 568         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags)) {
 569                 cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 570                 dbg_printk(MTIP_DRV_NAME " TFE for the internal command\n");
 571                 mtip_complete_command(cmd, BLK_STS_IOERR);
 572                 return;
 573         }
 574
 575         /* clear the tag accumulator */
 576         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 577
 578         /* Loop through all the groups */
 579         for (group = 0; group < dd->slot_groups; group++) {
 580                 completed = readl(port->completed[group]);
 581
 582                 dev_warn(&dd->pdev->dev, "g=%u, comp=%x\n", group, completed);
 583
 584                 /* clear completed status register in the hardware.*/
 585                 writel(completed, port->completed[group]);
 586
 587                 /* Process successfully completed commands */
 588                 for (bit = 0; bit < 32 && completed; bit++) {
 589                         if (!(completed & (1<<bit)))
 590                                 continue;
 591                         tag = (group << 5) + bit;
 592
 593                         /* Skip the internal command slot */
 594                         if (tag == MTIP_TAG_INTERNAL)
 595                                 continue;
 596
 597                         cmd = mtip_cmd_from_tag(dd, tag);
 598                         mtip_complete_command(cmd, 0);
 599                         set_bit(tag, tagaccum);
 600                         cmd_cnt++;
 601                 }
 602         }
 603
 604         print_tags(dd, "completed (TFE)", tagaccum, cmd_cnt);
 605
 606         /* Restart the port */
 607         mdelay(20);
 608         mtip_restart_port(port);
 609
 610         /* Trying to determine the cause of the error */
 611         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
 612                                 dd->port->log_buf,
 613                                 dd->port->log_buf_dma, 1);
 614         if (rv) {
 615                 dev_warn(&dd->pdev->dev,
 616                         "Error in READ LOG EXT (10h) command\n");
 617                 /* non-critical error, don't fail the load */
 618         } else {
 619                 buf = (unsigned char *)dd->port->log_buf;
 620                 if (buf[259] & 0x1) {
 621                         dev_info(&dd->pdev->dev,
 622                                 "Write protect bit is set.\n");
 623                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
 624                         fail_all_ncq_write = 1;
 625                         fail_reason = "write protect";
 626                 }
 627                 if (buf[288] == 0xF7) {
 628                         dev_info(&dd->pdev->dev,
 629                                 "Exceeded Tmax, drive in thermal shutdown.\n");
 630                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
 631                         fail_all_ncq_cmds = 1;
 632                         fail_reason = "thermal shutdown";
 633                 }
 634                 if (buf[288] == 0xBF) {
 635                         set_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag);
 636                         dev_info(&dd->pdev->dev,
 637                                 "Drive indicates rebuild has failed. Secure erase required.\n");
 638                         fail_all_ncq_cmds = 1;
 639                         fail_reason = "rebuild failed";
 640                 }
 641         }
 642
 643         /* clear the tag accumulator */
 644         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 645
 646         /* Loop through all the groups */
 647         for (group = 0; group < dd->slot_groups; group++) {
 648                 for (bit = 0; bit < 32; bit++) {
 649                         reissue = 1;
 650                         tag = (group << 5) + bit;
 651                         cmd = mtip_cmd_from_tag(dd, tag);
 652
 653                         fis = (struct host_to_dev_fis *)cmd->command;
 654
 655                         /* Should re-issue? */
 656                         if (tag == MTIP_TAG_INTERNAL ||
 657                             fis->command == ATA_CMD_SET_FEATURES)
 658                                 reissue = 0;
 659                         else {
 660                                 if (fail_all_ncq_cmds ||
 661                                         (fail_all_ncq_write &&
 662                                         fis->command == ATA_CMD_FPDMA_WRITE)) {
 663                                         dev_warn(&dd->pdev->dev,
 664                                         "  Fail: %s w/tag %d [%s].\n",
 665                                         fis->command == ATA_CMD_FPDMA_WRITE ?
 666                                                 "write" : "read",
 667                                         tag,
 668                                         fail_reason != NULL ?
 669                                                 fail_reason : "unknown");
 670                                         mtip_complete_command(cmd, BLK_STS_MEDIUM);
 671                                         continue;
 672                                 }
 673                         }
 674
 675                         /*
 676                          * First check if this command has
 677                          *  exceeded its retries.
 678                          */
 679                         if (reissue && (cmd->retries-- > 0)) {
 680
 681                                 set_bit(tag, tagaccum);
 682
 683                                 /* Re-issue the command. */
 684                                 mtip_issue_ncq_command(port, tag);
 685
 686                                 continue;
 687                         }
 688
 689                         /* Retire a command that will not be reissued */
 690                         dev_warn(&port->dd->pdev->dev,
 691                                 "retiring tag %d\n", tag);
 692
 693                         mtip_complete_command(cmd, BLK_STS_IOERR);
 694                 }
 695         }
 696         print_tags(dd, "reissued (TFE)", tagaccum, cmd_cnt);
 697 }
 698
 699 /*
 700  * Handle a set device bits interrupt
 701  */
 702 static inline void mtip_workq_sdbfx(struct mtip_port *port, int group,
 703                                                         u32 completed)
 704 {
 705         struct driver_data *dd = port->dd;
 706         int tag, bit;
 707         struct mtip_cmd *command;
 708
 709         if (!completed) {
 710                 WARN_ON_ONCE(!completed);
 711                 return;
 712         }
 713         /* clear completed status register in the hardware.*/
 714         writel(completed, port->completed[group]);
 715
 716         /* Process completed commands. */
 717         for (bit = 0; (bit < 32) && completed; bit++) {
 718                 if (completed & 0x01) {
 719                         tag = (group << 5) | bit;
 720
 721                         /* skip internal command slot. */
 722                         if (unlikely(tag == MTIP_TAG_INTERNAL))
 723                                 continue;
 724
 725                         command = mtip_cmd_from_tag(dd, tag);
 726                         mtip_complete_command(command, 0);
 727                 }
 728                 completed >>= 1;
 729         }
 730
 731         /* If last, re-enable interrupts */
 732         if (atomic_dec_return(&dd->irq_workers_active) == 0)
 733                 writel(0xffffffff, dd->mmio + HOST_IRQ_STAT);
 734 }
 735
 736 /*
 737  * Process legacy pio and d2h interrupts
 738  */
 739 static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat)
 740 {
 741         struct mtip_port *port = dd->port;
 742         struct mtip_cmd *cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 743
 744         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) && cmd) {
 745                 int group = MTIP_TAG_INDEX(MTIP_TAG_INTERNAL);
 746                 int status = readl(port->cmd_issue[group]);
 747
 748                 if (!(status & (1 << MTIP_TAG_BIT(MTIP_TAG_INTERNAL))))
 749                         mtip_complete_command(cmd, 0);
 750         }
 751 }
 752
 753 /*
 754  * Demux and handle errors
 755  */
 756 static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat)
 757 {
 758         if (unlikely(port_stat & PORT_IRQ_CONNECT)) {
 759                 dev_warn(&dd->pdev->dev,
 760                         "Clearing PxSERR.DIAG.x\n");
 761                 writel((1 << 26), dd->port->mmio + PORT_SCR_ERR);
 762         }
 763
 764         if (unlikely(port_stat & PORT_IRQ_PHYRDY)) {
 765                 dev_warn(&dd->pdev->dev,
 766                         "Clearing PxSERR.DIAG.n\n");
 767                 writel((1 << 16), dd->port->mmio + PORT_SCR_ERR);
 768         }
 769
 770         if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) {
 771                 dev_warn(&dd->pdev->dev,
 772                         "Port stat errors %x unhandled\n",
 773                         (port_stat & ~PORT_IRQ_HANDLED));
 774                 if (mtip_check_surprise_removal(dd->pdev))
 775                         return;
 776         }
 777         if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR))) {
 778                 set_bit(MTIP_PF_EH_ACTIVE_BIT, &dd->port->flags);
 779                 wake_up_interruptible(&dd->port->svc_wait);
 780         }
 781 }
 782
 783 static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
 784 {
 785         struct driver_data *dd = (struct driver_data *) data;
 786         struct mtip_port *port = dd->port;
 787         u32 hba_stat, port_stat;
 788         int rv = IRQ_NONE;
 789         int do_irq_enable = 1, i, workers;
 790         struct mtip_work *twork;
 791
 792         hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
 793         if (hba_stat) {
 794                 rv = IRQ_HANDLED;
 795
 796                 /* Acknowledge the interrupt status on the port.*/
 797                 port_stat = readl(port->mmio + PORT_IRQ_STAT);
 798                 if (unlikely(port_stat == 0xFFFFFFFF)) {
 799                         mtip_check_surprise_removal(dd->pdev);
 800                         return IRQ_HANDLED;
 801                 }
 802                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
 803
 804                 /* Demux port status */
 805                 if (likely(port_stat & PORT_IRQ_SDB_FIS)) {
 806                         do_irq_enable = 0;
 807                         WARN_ON_ONCE(atomic_read(&dd->irq_workers_active) != 0);
 808
 809                         /* Start at 1: group zero is always local? */
 810                         for (i = 0, workers = 0; i < MTIP_MAX_SLOT_GROUPS;
 811                                                                         i++) {
 812                                 twork = &dd->work[i];
 813                                 twork->completed = readl(port->completed[i]);
 814                                 if (twork->completed)
 815                                         workers++;
 816                         }
 817
 818                         atomic_set(&dd->irq_workers_active, workers);
 819                         if (workers) {
 820                                 for (i = 1; i < MTIP_MAX_SLOT_GROUPS; i++) {
 821                                         twork = &dd->work[i];
 822                                         if (twork->completed)
 823                                                 queue_work_on(
 824                                                         twork->cpu_binding,
 825                                                         dd->isr_workq,
 826                                                         &twork->work);
 827                                 }
 828
 829                                 if (likely(dd->work[0].completed))
 830                                         mtip_workq_sdbfx(port, 0,
 831                                                         dd->work[0].completed);
 832
 833                         } else {
 834                                 /*
 835                                  * Chip quirk: SDB interrupt but nothing
 836                                  * to complete
 837                                  */
 838                                 do_irq_enable = 1;
 839                         }
 840                 }
 841
 842                 if (unlikely(port_stat & PORT_IRQ_ERR)) {
 843                         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
 844                                 /* don't proceed further */
 845                                 return IRQ_HANDLED;
 846                         }
 847                         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
 848                                                         &dd->dd_flag))
 849                                 return rv;
 850
 851                         mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
 852                 }
 853
 854                 if (unlikely(port_stat & PORT_IRQ_LEGACY))
 855                         mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY);
 856         }
 857
 858         /* acknowledge interrupt */
 859         if (unlikely(do_irq_enable))
 860                 writel(hba_stat, dd->mmio + HOST_IRQ_STAT);
 861
 862         return rv;
 863 }
 864
 865 /*
 866  * HBA interrupt subroutine.
 867  *
 868  * @irq         IRQ number.
 869  * @instance    Pointer to the driver data structure.
 870  *
 871  * return value
 872  *      IRQ_HANDLED     A HBA interrupt was pending and handled.
 873  *      IRQ_NONE        This interrupt was not for the HBA.
 874  */
 875 static irqreturn_t mtip_irq_handler(int irq, void *instance)
 876 {
 877         struct driver_data *dd = instance;
 878
 879         return mtip_handle_irq(dd);
 880 }
 881
 882 static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
 883 {
 884         writel(1 << MTIP_TAG_BIT(tag), port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 885 }
 886
 887 static bool mtip_pause_ncq(struct mtip_port *port,
 888                                 struct host_to_dev_fis *fis)
 889 {
 890         unsigned long task_file_data;
 891
 892         task_file_data = readl(port->mmio+PORT_TFDATA);
 893         if ((task_file_data & 1))
 894                 return false;
 895
 896         if (fis->command == ATA_CMD_SEC_ERASE_PREP) {
 897                 port->ic_pause_timer = jiffies;
 898                 return true;
 899         } else if ((fis->command == ATA_CMD_DOWNLOAD_MICRO) &&
 900                                         (fis->features == 0x03)) {
 901                 set_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
 902                 port->ic_pause_timer = jiffies;
 903                 return true;
 904         } else if ((fis->command == ATA_CMD_SEC_ERASE_UNIT) ||
 905                 ((fis->command == 0xFC) &&
 906                         (fis->features == 0x27 || fis->features == 0x72 ||
 907                          fis->features == 0x62 || fis->features == 0x26))) {
 908                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
 909                 clear_bit(MTIP_DDF_REBUILD_FAILED_BIT, &port->dd->dd_flag);
 910                 /* Com reset after secure erase or lowlevel format */
 911                 mtip_restart_port(port);
 912                 clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
 913                 return false;
 914         }
 915
 916         return false;
 917 }
 918
 919 static bool mtip_commands_active(struct mtip_port *port)
 920 {
 921         unsigned int active;
 922         unsigned int n;
 923
 924         /*
 925          * Ignore s_active bit 0 of array element 0.
 926          * This bit will always be set
 927          */
 928         active = readl(port->s_active[0]) & 0xFFFFFFFE;
 929         for (n = 1; n < port->dd->slot_groups; n++)
 930                 active |= readl(port->s_active[n]);
 931
 932         return active != 0;
 933 }
 934
 935 /*
 936  * Wait for port to quiesce
 937  *
 938  * @port    Pointer to port data structure
 939  * @timeout Max duration to wait (ms)
 940  *
 941  * return value
 942  *      0       Success
 943  *      -EBUSY  Commands still active
 944  */
 945 static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
 946 {
 947         unsigned long to;
 948         bool active = true;
 949
 950         blk_mq_quiesce_queue(port->dd->queue);
 951
 952         to = jiffies + msecs_to_jiffies(timeout);
 953         do {
 954                 if (test_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags) &&
 955                         test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
 956                         msleep(20);
 957                         continue; /* svc thd is actively issuing commands */
 958                 }
 959
 960                 msleep(100);
 961
 962                 if (mtip_check_surprise_removal(port->dd->pdev))
 963                         goto err_fault;
 964
 965                 active = mtip_commands_active(port);
 966                 if (!active)
 967                         break;
 968         } while (time_before(jiffies, to));
 969
 970         blk_mq_unquiesce_queue(port->dd->queue);
 971         return active ? -EBUSY : 0;
 972 err_fault:
 973         blk_mq_unquiesce_queue(port->dd->queue);
 974         return -EFAULT;
 975 }
 976
 977 struct mtip_int_cmd {
 978         int fis_len;
 979         dma_addr_t buffer;
 980         int buf_len;
 981         u32 opts;
 982 };
 983
 984 /*
 985  * Execute an internal command and wait for the completion.
 986  *
 987  * @port    Pointer to the port data structure.
 988  * @fis     Pointer to the FIS that describes the command.
 989  * @fis_len  Length in WORDS of the FIS.
 990  * @buffer  DMA accessible for command data.
 991  * @buf_len  Length, in bytes, of the data buffer.
 992  * @opts    Command header options, excluding the FIS length
 993  *             and the number of PRD entries.
 994  * @timeout Time in ms to wait for the command to complete.
 995  *
 996  * return value
 997  *      0        Command completed successfully.
 998  *      -EFAULT  The buffer address is not correctly aligned.
 999  *      -EBUSY   Internal command or other IO in progress.
1000  *      -EAGAIN  Time out waiting for command to complete.
1001  */
1002 static int mtip_exec_internal_command(struct mtip_port *port,
1003                                         struct host_to_dev_fis *fis,
1004                                         int fis_len,
1005                                         dma_addr_t buffer,
1006                                         int buf_len,
1007                                         u32 opts,
1008                                         unsigned long timeout)
1009 {
1010         struct mtip_cmd *int_cmd;
1011         struct driver_data *dd = port->dd;
1012         struct request *rq;
1013         struct mtip_int_cmd icmd = {
1014                 .fis_len = fis_len,
1015                 .buffer = buffer,
1016                 .buf_len = buf_len,
1017                 .opts = opts
1018         };
1019         int rv = 0;
1020
1021         /* Make sure the buffer is 8 byte aligned. This is asic specific. */
1022         if (buffer & 0x00000007) {
1023                 dev_err(&dd->pdev->dev, "SG buffer is not 8 byte aligned\n");
1024                 return -EFAULT;
1025         }
1026
1027         int_cmd = mtip_get_int_command(dd);
1028         if (!int_cmd) {
1029                 dbg_printk(MTIP_DRV_NAME "Unable to allocate tag for PIO cmd\n");
1030                 return -EFAULT;
1031         }
1032         rq = blk_mq_rq_from_pdu(int_cmd);
1033         rq->special = &icmd;
1034
1035         set_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1036
1037         if (fis->command == ATA_CMD_SEC_ERASE_PREP)
1038                 set_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1039
1040         clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1041
1042         if (fis->command != ATA_CMD_STANDBYNOW1) {
1043                 /* wait for io to complete if non atomic */
1044                 if (mtip_quiesce_io(port, MTIP_QUIESCE_IO_TIMEOUT_MS) < 0) {
1045                         dev_warn(&dd->pdev->dev, "Failed to quiesce IO\n");
1046                         blk_mq_free_request(rq);
1047                         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1048                         wake_up_interruptible(&port->svc_wait);
1049                         return -EBUSY;
1050                 }
1051         }
1052
1053         /* Copy the command to the command table */
1054         memcpy(int_cmd->command, fis, fis_len*4);
1055
1056         rq->timeout = timeout;
1057
1058         /* insert request and run queue */
1059         blk_execute_rq(rq->q, NULL, rq, true);
1060
1061         if (int_cmd->status) {
1062                 dev_err(&dd->pdev->dev, "Internal command [%02X] failed %d\n",
1063                                 fis->command, int_cmd->status);
1064                 rv = -EIO;
1065
1066                 if (mtip_check_surprise_removal(dd->pdev) ||
1067                         test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1068                                         &dd->dd_flag)) {
1069                         dev_err(&dd->pdev->dev,
1070                                 "Internal command [%02X] wait returned due to SR\n",
1071                                 fis->command);
1072                         rv = -ENXIO;
1073                         goto exec_ic_exit;
1074                 }
1075                 mtip_device_reset(dd); /* recover from timeout issue */
1076                 rv = -EAGAIN;
1077                 goto exec_ic_exit;
1078         }
1079
1080         if (readl(port->cmd_issue[MTIP_TAG_INDEX(MTIP_TAG_INTERNAL)])
1081                         & (1 << MTIP_TAG_BIT(MTIP_TAG_INTERNAL))) {
1082                 rv = -ENXIO;
1083                 if (!test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
1084                         mtip_device_reset(dd);
1085                         rv = -EAGAIN;
1086                 }
1087         }
1088 exec_ic_exit:
1089         /* Clear the allocated and active bits for the internal command. */
1090         blk_mq_free_request(rq);
1091         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1092         if (rv >= 0 && mtip_pause_ncq(port, fis)) {
1093                 /* NCQ paused */
1094                 return rv;
1095         }
1096         wake_up_interruptible(&port->svc_wait);
1097
1098         return rv;
1099 }
1100
1101 /*
1102  * Byte-swap ATA ID strings.
1103  *
1104  * ATA identify data contains strings in byte-swapped 16-bit words.
1105  * They must be swapped (on all architectures) to be usable as C strings.
1106  * This function swaps bytes in-place.
1107  *
1108  * @buf The buffer location of the string
1109  * @len The number of bytes to swap
1110  *
1111  * return value
1112  *      None
1113  */
1114 static inline void ata_swap_string(u16 *buf, unsigned int len)
1115 {
1116         int i;
1117         for (i = 0; i < (len/2); i++)
1118                 be16_to_cpus(&buf[i]);
1119 }
1120
1121 static void mtip_set_timeout(struct driver_data *dd,
1122                                         struct host_to_dev_fis *fis,
1123                                         unsigned int *timeout, u8 erasemode)
1124 {
1125         switch (fis->command) {
1126         case ATA_CMD_DOWNLOAD_MICRO:
1127                 *timeout = 120000; /* 2 minutes */
1128                 break;
1129         case ATA_CMD_SEC_ERASE_UNIT:
1130         case 0xFC:
1131                 if (erasemode)
1132                         *timeout = ((*(dd->port->identify + 90) * 2) * 60000);
1133                 else
1134                         *timeout = ((*(dd->port->identify + 89) * 2) * 60000);
1135                 break;
1136         case ATA_CMD_STANDBYNOW1:
1137                 *timeout = 120000;  /* 2 minutes */
1138                 break;
1139         case 0xF7:
1140         case 0xFA:
1141                 *timeout = 60000;  /* 60 seconds */
1142                 break;
1143         case ATA_CMD_SMART:
1144                 *timeout = 15000;  /* 15 seconds */
1145                 break;
1146         default:
1147                 *timeout = MTIP_IOCTL_CMD_TIMEOUT_MS;
1148                 break;
1149         }
1150 }
1151
1152 /*
1153  * Request the device identity information.
1154  *
1155  * If a user space buffer is not specified, i.e. is NULL, the
1156  * identify information is still read from the drive and placed
1157  * into the identify data buffer (@e port->identify) in the
1158  * port data structure.
1159  * When the identify buffer contains valid identify information @e
1160  * port->identify_valid is non-zero.
1161  *
1162  * @port         Pointer to the port structure.
1163  * @user_buffer  A user space buffer where the identify data should be
1164  *                    copied.
1165  *
1166  * return value
1167  *      0       Command completed successfully.
1168  *      -EFAULT An error occurred while coping data to the user buffer.
1169  *      -1      Command failed.
1170  */
1171 static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
1172 {
1173         int rv = 0;
1174         struct host_to_dev_fis fis;
1175
1176         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1177                 return -EFAULT;
1178
1179         /* Build the FIS. */
1180         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1181         fis.type        = 0x27;
1182         fis.opts        = 1 << 7;
1183         fis.command     = ATA_CMD_ID_ATA;
1184
1185         /* Set the identify information as invalid. */
1186         port->identify_valid = 0;
1187
1188         /* Clear the identify information. */
1189         memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);
1190
1191         /* Execute the command. */
1192         if (mtip_exec_internal_command(port,
1193                                 &fis,
1194                                 5,
1195                                 port->identify_dma,
1196                                 sizeof(u16) * ATA_ID_WORDS,
1197                                 0,
1198                                 MTIP_INT_CMD_TIMEOUT_MS)
1199                                 < 0) {
1200                 rv = -1;
1201                 goto out;
1202         }
1203
1204         /*
1205          * Perform any necessary byte-swapping.  Yes, the kernel does in fact
1206          * perform field-sensitive swapping on the string fields.
1207          * See the kernel use of ata_id_string() for proof of this.
1208          */
1209 #ifdef __LITTLE_ENDIAN
1210         ata_swap_string(port->identify + 27, 40);  /* model string*/
1211         ata_swap_string(port->identify + 23, 8);   /* firmware string*/
1212         ata_swap_string(port->identify + 10, 20);  /* serial# string*/
1213 #else
1214         {
1215                 int i;
1216                 for (i = 0; i < ATA_ID_WORDS; i++)
1217                         port->identify[i] = le16_to_cpu(port->identify[i]);
1218         }
1219 #endif
1220
1221         /* Check security locked state */
1222         if (port->identify[128] & 0x4)
1223                 set_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1224         else
1225                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1226
1227 #ifdef MTIP_TRIM /* Disabling TRIM support temporarily */
1228         /* Demux ID.DRAT & ID.RZAT to determine trim support */
1229         if (port->identify[69] & (1 << 14) && port->identify[69] & (1 << 5))
1230                 port->dd->trim_supp = true;
1231         else
1232 #endif
1233                 port->dd->trim_supp = false;
1234
1235         /* Set the identify buffer as valid. */
1236         port->identify_valid = 1;
1237
1238         if (user_buffer) {
1239                 if (copy_to_user(
1240                         user_buffer,
1241                         port->identify,
1242                         ATA_ID_WORDS * sizeof(u16))) {
1243                         rv = -EFAULT;
1244                         goto out;
1245                 }
1246         }
1247
1248 out:
1249         return rv;
1250 }
1251
1252 /*
1253  * Issue a standby immediate command to the device.
1254  *
1255  * @port Pointer to the port structure.
1256  *
1257  * return value
1258  *      0       Command was executed successfully.
1259  *      -1      An error occurred while executing the command.
1260  */
1261 static int mtip_standby_immediate(struct mtip_port *port)
1262 {
1263         int rv;
1264         struct host_to_dev_fis  fis;
1265         unsigned long start;
1266         unsigned int timeout;
1267
1268         /* Build the FIS. */
1269         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1270         fis.type        = 0x27;
1271         fis.opts        = 1 << 7;
1272         fis.command     = ATA_CMD_STANDBYNOW1;
1273
1274         mtip_set_timeout(port->dd, &fis, &timeout, 0);
1275
1276         start = jiffies;
1277         rv = mtip_exec_internal_command(port,
1278                                         &fis,
1279                                         5,
1280                                         0,
1281                                         0,
1282                                         0,
1283                                         timeout);
1284         dbg_printk(MTIP_DRV_NAME "Time taken to complete standby cmd: %d ms\n",
1285                         jiffies_to_msecs(jiffies - start));
1286         if (rv)
1287                 dev_warn(&port->dd->pdev->dev,
1288                         "STANDBY IMMEDIATE command failed.\n");
1289
1290         return rv;
1291 }
1292
1293 /*
1294  * Issue a READ LOG EXT command to the device.
1295  *
1296  * @port        pointer to the port structure.
1297  * @page        page number to fetch
1298  * @buffer      pointer to buffer
1299  * @buffer_dma  dma address corresponding to @buffer
1300  * @sectors     page length to fetch, in sectors
1301  *
1302  * return value
1303  *      @rv     return value from mtip_exec_internal_command()
1304  */
1305 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
1306                                 dma_addr_t buffer_dma, unsigned int sectors)
1307 {
1308         struct host_to_dev_fis fis;
1309
1310         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1311         fis.type        = 0x27;
1312         fis.opts        = 1 << 7;
1313         fis.command     = ATA_CMD_READ_LOG_EXT;
1314         fis.sect_count  = sectors & 0xFF;
1315         fis.sect_cnt_ex = (sectors >> 8) & 0xFF;
1316         fis.lba_low     = page;
1317         fis.lba_mid     = 0;
1318         fis.device      = ATA_DEVICE_OBS;
1319
1320         memset(buffer, 0, sectors * ATA_SECT_SIZE);
1321
1322         return mtip_exec_internal_command(port,
1323                                         &fis,
1324                                         5,
1325                                         buffer_dma,
1326                                         sectors * ATA_SECT_SIZE,
1327                                         0,
1328                                         MTIP_INT_CMD_TIMEOUT_MS);
1329 }
1330
1331 /*
1332  * Issue a SMART READ DATA command to the device.
1333  *
1334  * @port        pointer to the port structure.
1335  * @buffer      pointer to buffer
1336  * @buffer_dma  dma address corresponding to @buffer
1337  *
1338  * return value
1339  *      @rv     return value from mtip_exec_internal_command()
1340  */
1341 static int mtip_get_smart_data(struct mtip_port *port, u8 *buffer,
1342                                         dma_addr_t buffer_dma)
1343 {
1344         struct host_to_dev_fis fis;
1345
1346         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1347         fis.type        = 0x27;
1348         fis.opts        = 1 << 7;
1349         fis.command     = ATA_CMD_SMART;
1350         fis.features    = 0xD0;
1351         fis.sect_count  = 1;
1352         fis.lba_mid     = 0x4F;
1353         fis.lba_hi      = 0xC2;
1354         fis.device      = ATA_DEVICE_OBS;
1355
1356         return mtip_exec_internal_command(port,
1357                                         &fis,
1358                                         5,
1359                                         buffer_dma,
1360                                         ATA_SECT_SIZE,
1361                                         0,
1362                                         15000);
1363 }
1364
1365 /*
1366  * Get the value of a smart attribute
1367  *
1368  * @port        pointer to the port structure
1369  * @id          attribute number
1370  * @attrib      pointer to return attrib information corresponding to @id
1371  *
1372  * return value
1373  *      -EINVAL NULL buffer passed or unsupported attribute @id.
1374  *      -EPERM  Identify data not valid, SMART not supported or not enabled
1375  */
1376 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
1377                                                 struct smart_attr *attrib)
1378 {
1379         int rv, i;
1380         struct smart_attr *pattr;
1381
1382         if (!attrib)
1383                 return -EINVAL;
1384
1385         if (!port->identify_valid) {
1386                 dev_warn(&port->dd->pdev->dev, "IDENTIFY DATA not valid\n");
1387                 return -EPERM;
1388         }
1389         if (!(port->identify[82] & 0x1)) {
1390                 dev_warn(&port->dd->pdev->dev, "SMART not supported\n");
1391                 return -EPERM;
1392         }
1393         if (!(port->identify[85] & 0x1)) {
1394                 dev_warn(&port->dd->pdev->dev, "SMART not enabled\n");
1395                 return -EPERM;
1396         }
1397
1398         memset(port->smart_buf, 0, ATA_SECT_SIZE);
1399         rv = mtip_get_smart_data(port, port->smart_buf, port->smart_buf_dma);
1400         if (rv) {
1401                 dev_warn(&port->dd->pdev->dev, "Failed to ge SMART data\n");
1402                 return rv;
1403         }
1404
1405         pattr = (struct smart_attr *)(port->smart_buf + 2);
1406         for (i = 0; i < 29; i++, pattr++)
1407                 if (pattr->attr_id == id) {
1408                         memcpy(attrib, pattr, sizeof(struct smart_attr));
1409                         break;
1410                 }
1411
1412         if (i == 29) {
1413                 dev_warn(&port->dd->pdev->dev,
1414                         "Query for invalid SMART attribute ID\n");
1415                 rv = -EINVAL;
1416         }
1417
1418         return rv;
1419 }
1420
1421 /*
1422  * Trim unused sectors
1423  *
1424  * @dd          pointer to driver_data structure
1425  * @lba         starting lba
1426  * @len         # of 512b sectors to trim
1427  *
1428  * return value
1429  *      -ENOMEM         Out of dma memory
1430  *      -EINVAL         Invalid parameters passed in, trim not supported
1431  *      -EIO            Error submitting trim request to hw
1432  */
1433 static int mtip_send_trim(struct driver_data *dd, unsigned int lba,
1434                                 unsigned int len)
1435 {
1436         int i, rv = 0;
1437         u64 tlba, tlen, sect_left;
1438         struct mtip_trim_entry *buf;
1439         dma_addr_t dma_addr;
1440         struct host_to_dev_fis fis;
1441
1442         if (!len || dd->trim_supp == false)
1443                 return -EINVAL;
1444
1445         /* Trim request too big */
1446         WARN_ON(len > (MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES));
1447
1448         /* Trim request not aligned on 4k boundary */
1449         WARN_ON(len % 8 != 0);
1450
1451         /* Warn if vu_trim structure is too big */
1452         WARN_ON(sizeof(struct mtip_trim) > ATA_SECT_SIZE);
1453
1454         /* Allocate a DMA buffer for the trim structure */
1455         buf = dmam_alloc_coherent(&dd->pdev->dev, ATA_SECT_SIZE, &dma_addr,
1456                                                                 GFP_KERNEL);
1457         if (!buf)
1458                 return -ENOMEM;
1459         memset(buf, 0, ATA_SECT_SIZE);
1460
1461         for (i = 0, sect_left = len, tlba = lba;
1462                         i < MTIP_MAX_TRIM_ENTRIES && sect_left;
1463                         i++) {
1464                 tlen = (sect_left >= MTIP_MAX_TRIM_ENTRY_LEN ?
1465                                         MTIP_MAX_TRIM_ENTRY_LEN :
1466                                         sect_left);
1467                 buf[i].lba = __force_bit2int cpu_to_le32(tlba);
1468                 buf[i].range = __force_bit2int cpu_to_le16(tlen);
1469                 tlba += tlen;
1470                 sect_left -= tlen;
1471         }
1472         WARN_ON(sect_left != 0);
1473
1474         /* Build the fis */
1475         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1476         fis.type       = 0x27;
1477         fis.opts       = 1 << 7;
1478         fis.command    = 0xfb;
1479         fis.features   = 0x60;
1480         fis.sect_count = 1;
1481         fis.device     = ATA_DEVICE_OBS;
1482
1483         if (mtip_exec_internal_command(dd->port,
1484                                         &fis,
1485                                         5,
1486                                         dma_addr,
1487                                         ATA_SECT_SIZE,
1488                                         0,
1489                                         MTIP_TRIM_TIMEOUT_MS) < 0)
1490                 rv = -EIO;
1491
1492         dmam_free_coherent(&dd->pdev->dev, ATA_SECT_SIZE, buf, dma_addr);
1493         return rv;
1494 }
1495
1496 /*
1497  * Get the drive capacity.
1498  *
1499  * @dd      Pointer to the device data structure.
1500  * @sectors Pointer to the variable that will receive the sector count.
1501  *
1502  * return value
1503  *      1 Capacity was returned successfully.
1504  *      0 The identify information is invalid.
1505  */
1506 static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
1507 {
1508         struct mtip_port *port = dd->port;
1509         u64 total, raw0, raw1, raw2, raw3;
1510         raw0 = port->identify[100];
1511         raw1 = port->identify[101];
1512         raw2 = port->identify[102];
1513         raw3 = port->identify[103];
1514         total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
1515         *sectors = total;
1516         return (bool) !!port->identify_valid;
1517 }
1518
1519 /*
1520  * Display the identify command data.
1521  *
1522  * @port Pointer to the port data structure.
1523  *
1524  * return value
1525  *      None
1526  */
1527 static void mtip_dump_identify(struct mtip_port *port)
1528 {
1529         sector_t sectors;
1530         unsigned short revid;
1531         char cbuf[42];
1532
1533         if (!port->identify_valid)
1534                 return;
1535
1536         strlcpy(cbuf, (char *)(port->identify+10), 21);
1537         dev_info(&port->dd->pdev->dev,
1538                 "Serial No.: %s\n", cbuf);
1539
1540         strlcpy(cbuf, (char *)(port->identify+23), 9);
1541         dev_info(&port->dd->pdev->dev,
1542                 "Firmware Ver.: %s\n", cbuf);
1543
1544         strlcpy(cbuf, (char *)(port->identify+27), 41);
1545         dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);
1546
1547         dev_info(&port->dd->pdev->dev, "Security: %04x %s\n",
1548                 port->identify[128],
1549                 port->identify[128] & 0x4 ? "(LOCKED)" : "");
1550
1551         if (mtip_hw_get_capacity(port->dd, &sectors))
1552                 dev_info(&port->dd->pdev->dev,
1553                         "Capacity: %llu sectors (%llu MB)\n",
1554                          (u64)sectors,
1555                          ((u64)sectors) * ATA_SECT_SIZE >> 20);
1556
1557         pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
1558         switch (revid & 0xFF) {
1559         case 0x1:
1560                 strlcpy(cbuf, "A0", 3);
1561                 break;
1562         case 0x3:
1563                 strlcpy(cbuf, "A2", 3);
1564                 break;
1565         default:
1566                 strlcpy(cbuf, "?", 2);
1567                 break;
1568         }
1569         dev_info(&port->dd->pdev->dev,
1570                 "Card Type: %s\n", cbuf);
1571 }
1572
1573 /*
1574  * Map the commands scatter list into the command table.
1575  *
1576  * @command Pointer to the command.
1577  * @nents Number of scatter list entries.
1578  *
1579  * return value
1580  *      None
1581  */
1582 static inline void fill_command_sg(struct driver_data *dd,
1583                                 struct mtip_cmd *command,
1584                                 int nents)
1585 {
1586         int n;
1587         unsigned int dma_len;
1588         struct mtip_cmd_sg *command_sg;
1589         struct scatterlist *sg = command->sg;
1590
1591         command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
1592
1593         for (n = 0; n < nents; n++) {
1594                 dma_len = sg_dma_len(sg);
1595                 if (dma_len > 0x400000)
1596                         dev_err(&dd->pdev->dev,
1597                                 "DMA segment length truncated\n");
1598                 command_sg->info = __force_bit2int
1599                         cpu_to_le32((dma_len-1) & 0x3FFFFF);
1600                 command_sg->dba = __force_bit2int
1601                         cpu_to_le32(sg_dma_address(sg));
1602                 command_sg->dba_upper = __force_bit2int
1603                         cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
1604                 command_sg++;
1605                 sg++;
1606         }
1607 }
1608
1609 /*
1610  * @brief Execute a drive command.
1611  *
1612  * return value 0 The command completed successfully.
1613  * return value -1 An error occurred while executing the command.
1614  */
1615 static int exec_drive_task(struct mtip_port *port, u8 *command)
1616 {
1617         struct host_to_dev_fis  fis;
1618         struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
1619         unsigned int to;
1620
1621         /* Build the FIS. */
1622         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1623         fis.type        = 0x27;
1624         fis.opts        = 1 << 7;
1625         fis.command     = command[0];
1626         fis.features    = command[1];
1627         fis.sect_count  = command[2];
1628         fis.sector      = command[3];
1629         fis.cyl_low     = command[4];
1630         fis.cyl_hi      = command[5];
1631         fis.device      = command[6] & ~0x10; /* Clear the dev bit*/
1632
1633         mtip_set_timeout(port->dd, &fis, &to, 0);
1634
1635         dbg_printk(MTIP_DRV_NAME " %s: User Command: cmd %x, feat %x, nsect %x, sect %x, lcyl %x, hcyl %x, sel %x\n",
1636                 __func__,
1637                 command[0],
1638                 command[1],
1639                 command[2],
1640                 command[3],
1641                 command[4],
1642                 command[5],
1643                 command[6]);
1644
1645         /* Execute the command. */
1646         if (mtip_exec_internal_command(port,
1647                                  &fis,
1648                                  5,
1649                                  0,
1650                                  0,
1651                                  0,
1652                                  to) < 0) {
1653                 return -1;
1654         }
1655
1656         command[0] = reply->command; /* Status*/
1657         command[1] = reply->features; /* Error*/
1658         command[4] = reply->cyl_low;
1659         command[5] = reply->cyl_hi;
1660
1661         dbg_printk(MTIP_DRV_NAME " %s: Completion Status: stat %x, err %x , cyl_lo %x cyl_hi %x\n",
1662                 __func__,
1663                 command[0],
1664                 command[1],
1665                 command[4],
1666                 command[5]);
1667
1668         return 0;
1669 }
1670
1671 /*
1672  * @brief Execute a drive command.
1673  *
1674  * @param port Pointer to the port data structure.
1675  * @param command Pointer to the user specified command parameters.
1676  * @param user_buffer Pointer to the user space buffer where read sector
1677  *                   data should be copied.
1678  *
1679  * return value 0 The command completed successfully.
1680  * return value -EFAULT An error occurred while copying the completion
1681  *                 data to the user space buffer.
1682  * return value -1 An error occurred while executing the command.
1683  */
1684 static int exec_drive_command(struct mtip_port *port, u8 *command,
1685                                 void __user *user_buffer)
1686 {
1687         struct host_to_dev_fis  fis;
1688         struct host_to_dev_fis *reply;
1689         u8 *buf = NULL;
1690         dma_addr_t dma_addr = 0;
1691         int rv = 0, xfer_sz = command[3];
1692         unsigned int to;
1693
1694         if (xfer_sz) {
1695                 if (!user_buffer)
1696                         return -EFAULT;
1697
1698                 buf = dmam_alloc_coherent(&port->dd->pdev->dev,
1699                                 ATA_SECT_SIZE * xfer_sz,
1700                                 &dma_addr,
1701                                 GFP_KERNEL);
1702                 if (!buf) {
1703                         dev_err(&port->dd->pdev->dev,
1704                                 "Memory allocation failed (%d bytes)\n",
1705                                 ATA_SECT_SIZE * xfer_sz);
1706                         return -ENOMEM;
1707                 }
1708                 memset(buf, 0, ATA_SECT_SIZE * xfer_sz);
1709         }
1710
1711         /* Build the FIS. */
1712         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1713         fis.type        = 0x27;
1714         fis.opts        = 1 << 7;
1715         fis.command     = command[0];
1716         fis.features    = command[2];
1717         fis.sect_count  = command[3];
1718         if (fis.command == ATA_CMD_SMART) {
1719                 fis.sector      = command[1];
1720                 fis.cyl_low     = 0x4F;
1721                 fis.cyl_hi      = 0xC2;
1722         }
1723
1724         mtip_set_timeout(port->dd, &fis, &to, 0);
1725
1726         if (xfer_sz)
1727                 reply = (port->rxfis + RX_FIS_PIO_SETUP);
1728         else
1729                 reply = (port->rxfis + RX_FIS_D2H_REG);
1730
1731         dbg_printk(MTIP_DRV_NAME
1732                 " %s: User Command: cmd %x, sect %x, "
1733                 "feat %x, sectcnt %x\n",
1734                 __func__,
1735                 command[0],
1736                 command[1],
1737                 command[2],
1738                 command[3]);
1739
1740         /* Execute the command. */
1741         if (mtip_exec_internal_command(port,
1742                                 &fis,
1743                                  5,
1744                                  (xfer_sz ? dma_addr : 0),
1745                                  (xfer_sz ? ATA_SECT_SIZE * xfer_sz : 0),
1746                                  0,
1747                                  to)
1748                                  < 0) {
1749                 rv = -EFAULT;
1750                 goto exit_drive_command;
1751         }
1752
1753         /* Collect the completion status. */
1754         command[0] = reply->command; /* Status*/
1755         command[1] = reply->features; /* Error*/
1756         command[2] = reply->sect_count;
1757
1758         dbg_printk(MTIP_DRV_NAME
1759                 " %s: Completion Status: stat %x, "
1760                 "err %x, nsect %x\n",
1761                 __func__,
1762                 command[0],
1763                 command[1],
1764                 command[2]);
1765
1766         if (xfer_sz) {
1767                 if (copy_to_user(user_buffer,
1768                                  buf,
1769                                  ATA_SECT_SIZE * command[3])) {
1770                         rv = -EFAULT;
1771                         goto exit_drive_command;
1772                 }
1773         }
1774 exit_drive_command:
1775         if (buf)
1776                 dmam_free_coherent(&port->dd->pdev->dev,
1777                                 ATA_SECT_SIZE * xfer_sz, buf, dma_addr);
1778         return rv;
1779 }
1780
1781 /*
1782  *  Indicates whether a command has a single sector payload.
1783  *
1784  *  @command passed to the device to perform the certain event.
1785  *  @features passed to the device to perform the certain event.
1786  *
1787  *  return value
1788  *      1       command is one that always has a single sector payload,
1789  *              regardless of the value in the Sector Count field.
1790  *      0       otherwise
1791  *
1792  */
1793 static unsigned int implicit_sector(unsigned char command,
1794                                     unsigned char features)
1795 {
1796         unsigned int rv = 0;
1797
1798         /* list of commands that have an implicit sector count of 1 */
1799         switch (command) {
1800         case ATA_CMD_SEC_SET_PASS:
1801         case ATA_CMD_SEC_UNLOCK:
1802         case ATA_CMD_SEC_ERASE_PREP:
1803         case ATA_CMD_SEC_ERASE_UNIT:
1804         case ATA_CMD_SEC_FREEZE_LOCK:
1805         case ATA_CMD_SEC_DISABLE_PASS:
1806         case ATA_CMD_PMP_READ:
1807         case ATA_CMD_PMP_WRITE:
1808                 rv = 1;
1809                 break;
1810         case ATA_CMD_SET_MAX:
1811                 if (features == ATA_SET_MAX_UNLOCK)
1812                         rv = 1;
1813                 break;
1814         case ATA_CMD_SMART:
1815                 if ((features == ATA_SMART_READ_VALUES) ||
1816                                 (features == ATA_SMART_READ_THRESHOLDS))
1817                         rv = 1;
1818                 break;
1819         case ATA_CMD_CONF_OVERLAY:
1820                 if ((features == ATA_DCO_IDENTIFY) ||
1821                                 (features == ATA_DCO_SET))
1822                         rv = 1;
1823                 break;
1824         }
1825         return rv;
1826 }
1827
1828 /*
1829  * Executes a taskfile
1830  * See ide_taskfile_ioctl() for derivation
1831  */
1832 static int exec_drive_taskfile(struct driver_data *dd,
1833                                void __user *buf,
1834                                ide_task_request_t *req_task,
1835                                int outtotal)
1836 {
1837         struct host_to_dev_fis  fis;
1838         struct host_to_dev_fis *reply;
1839         u8 *outbuf = NULL;
1840         u8 *inbuf = NULL;
1841         dma_addr_t outbuf_dma = 0;
1842         dma_addr_t inbuf_dma = 0;
1843         dma_addr_t dma_buffer = 0;
1844         int err = 0;
1845         unsigned int taskin = 0;
1846         unsigned int taskout = 0;
1847         u8 nsect = 0;
1848         unsigned int timeout;
1849         unsigned int force_single_sector;
1850         unsigned int transfer_size;
1851         unsigned long task_file_data;
1852         int intotal = outtotal + req_task->out_size;
1853         int erasemode = 0;
1854
1855         taskout = req_task->out_size;
1856         taskin = req_task->in_size;
1857         /* 130560 = 512 * 0xFF*/
1858         if (taskin > 130560 || taskout > 130560)
1859                 return -EINVAL;
1860
1861         if (taskout) {
1862                 outbuf = memdup_user(buf + outtotal, taskout);
1863                 if (IS_ERR(outbuf))
1864                         return PTR_ERR(outbuf);
1865
1866                 outbuf_dma = pci_map_single(dd->pdev,
1867                                          outbuf,
1868                                          taskout,
1869                                          DMA_TO_DEVICE);
1870                 if (pci_dma_mapping_error(dd->pdev, outbuf_dma)) {
1871                         err = -ENOMEM;
1872                         goto abort;
1873                 }
1874                 dma_buffer = outbuf_dma;
1875         }
1876
1877         if (taskin) {
1878                 inbuf = memdup_user(buf + intotal, taskin);
1879                 if (IS_ERR(inbuf)) {
1880                         err = PTR_ERR(inbuf);
1881                         inbuf = NULL;
1882                         goto abort;
1883                 }
1884                 inbuf_dma = pci_map_single(dd->pdev,
1885                                          inbuf,
1886                                          taskin, DMA_FROM_DEVICE);
1887                 if (pci_dma_mapping_error(dd->pdev, inbuf_dma)) {
1888                         err = -ENOMEM;
1889                         goto abort;
1890                 }
1891                 dma_buffer = inbuf_dma;
1892         }
1893
1894         /* only supports PIO and non-data commands from this ioctl. */
1895         switch (req_task->data_phase) {
1896         case TASKFILE_OUT:
1897                 nsect = taskout / ATA_SECT_SIZE;
1898                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
1899                 break;
1900         case TASKFILE_IN:
1901                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
1902                 break;
1903         case TASKFILE_NO_DATA:
1904                 reply = (dd->port->rxfis + RX_FIS_D2H_REG);
1905                 break;
1906         default:
1907                 err = -EINVAL;
1908                 goto abort;
1909         }
1910
1911         /* Build the FIS. */
1912         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1913
1914         fis.type        = 0x27;
1915         fis.opts        = 1 << 7;
1916         fis.command     = req_task->io_ports[7];
1917         fis.features    = req_task->io_ports[1];
1918         fis.sect_count  = req_task->io_ports[2];
1919         fis.lba_low     = req_task->io_ports[3];
1920         fis.lba_mid     = req_task->io_ports[4];
1921         fis.lba_hi      = req_task->io_ports[5];
1922          /* Clear the dev bit*/
1923         fis.device      = req_task->io_ports[6] & ~0x10;
1924
1925         if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
1926                 req_task->in_flags.all  =
1927                         IDE_TASKFILE_STD_IN_FLAGS |
1928                         (IDE_HOB_STD_IN_FLAGS << 8);
1929                 fis.lba_low_ex          = req_task->hob_ports[3];
1930                 fis.lba_mid_ex          = req_task->hob_ports[4];
1931                 fis.lba_hi_ex           = req_task->hob_ports[5];
1932                 fis.features_ex         = req_task->hob_ports[1];
1933                 fis.sect_cnt_ex         = req_task->hob_ports[2];
1934
1935         } else {
1936                 req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
1937         }
1938
1939         force_single_sector = implicit_sector(fis.command, fis.features);
1940
1941         if ((taskin || taskout) && (!fis.sect_count)) {
1942                 if (nsect)
1943                         fis.sect_count = nsect;
1944                 else {
1945                         if (!force_single_sector) {
1946                                 dev_warn(&dd->pdev->dev,
1947                                         "data movement but "
1948                                         "sect_count is 0\n");
1949                                         err = -EINVAL;
1950                                         goto abort;
1951                         }
1952                 }
1953         }
1954
1955         dbg_printk(MTIP_DRV_NAME
1956                 " %s: cmd %x, feat %x, nsect %x,"
1957                 " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
1958                 " head/dev %x\n",
1959                 __func__,
1960                 fis.command,
1961                 fis.features,
1962                 fis.sect_count,
1963                 fis.lba_low,
1964                 fis.lba_mid,
1965                 fis.lba_hi,
1966                 fis.device);
1967
1968         /* check for erase mode support during secure erase.*/
1969         if ((fis.command == ATA_CMD_SEC_ERASE_UNIT) && outbuf &&
1970                                         (outbuf[0] & MTIP_SEC_ERASE_MODE)) {
1971                 erasemode = 1;
1972         }
1973
1974         mtip_set_timeout(dd, &fis, &timeout, erasemode);
1975
1976         /* Determine the correct transfer size.*/
1977         if (force_single_sector)
1978                 transfer_size = ATA_SECT_SIZE;
1979         else
1980                 transfer_size = ATA_SECT_SIZE * fis.sect_count;
1981
1982         /* Execute the command.*/
1983         if (mtip_exec_internal_command(dd->port,
1984                                  &fis,
1985                                  5,
1986                                  dma_buffer,
1987                                  transfer_size,
1988                                  0,
1989                                  timeout) < 0) {
1990                 err = -EIO;
1991                 goto abort;
1992         }
1993
1994         task_file_data = readl(dd->port->mmio+PORT_TFDATA);
1995
1996         if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
1997                 reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
1998                 req_task->io_ports[7] = reply->control;
1999         } else {
2000                 reply = dd->port->rxfis + RX_FIS_D2H_REG;
2001                 req_task->io_ports[7] = reply->command;
2002         }
2003
2004         /* reclaim the DMA buffers.*/
2005         if (inbuf_dma)
2006                 pci_unmap_single(dd->pdev, inbuf_dma,
2007                         taskin, DMA_FROM_DEVICE);
2008         if (outbuf_dma)
2009                 pci_unmap_single(dd->pdev, outbuf_dma,
2010                         taskout, DMA_TO_DEVICE);
2011         inbuf_dma  = 0;
2012         outbuf_dma = 0;
2013
2014         /* return the ATA registers to the caller.*/
2015         req_task->io_ports[1] = reply->features;
2016         req_task->io_ports[2] = reply->sect_count;
2017         req_task->io_ports[3] = reply->lba_low;
2018         req_task->io_ports[4] = reply->lba_mid;
2019         req_task->io_ports[5] = reply->lba_hi;
2020         req_task->io_ports[6] = reply->device;
2021
2022         if (req_task->out_flags.all & 1)  {
2023
2024                 req_task->hob_ports[3] = reply->lba_low_ex;
2025                 req_task->hob_ports[4] = reply->lba_mid_ex;
2026                 req_task->hob_ports[5] = reply->lba_hi_ex;
2027                 req_task->hob_ports[1] = reply->features_ex;
2028                 req_task->hob_ports[2] = reply->sect_cnt_ex;
2029         }
2030         dbg_printk(MTIP_DRV_NAME
2031                 " %s: Completion: stat %x,"
2032                 "err %x, sect_cnt %x, lbalo %x,"
2033                 "lbamid %x, lbahi %x, dev %x\n",
2034                 __func__,
2035                 req_task->io_ports[7],
2036                 req_task->io_ports[1],
2037                 req_task->io_ports[2],
2038                 req_task->io_ports[3],
2039                 req_task->io_ports[4],
2040                 req_task->io_ports[5],
2041                 req_task->io_ports[6]);
2042
2043         if (taskout) {
2044                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
2045                         err = -EFAULT;
2046                         goto abort;
2047                 }
2048         }
2049         if (taskin) {
2050                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
2051                         err = -EFAULT;
2052                         goto abort;
2053                 }
2054         }
2055 abort:
2056         if (inbuf_dma)
2057                 pci_unmap_single(dd->pdev, inbuf_dma,
2058                                         taskin, DMA_FROM_DEVICE);
2059         if (outbuf_dma)
2060                 pci_unmap_single(dd->pdev, outbuf_dma,
2061                                         taskout, DMA_TO_DEVICE);
2062         kfree(outbuf);
2063         kfree(inbuf);
2064
2065         return err;
2066 }
2067
2068 /*
2069  * Handle IOCTL calls from the Block Layer.
2070  *
2071  * This function is called by the Block Layer when it receives an IOCTL
2072  * command that it does not understand. If the IOCTL command is not supported
2073  * this function returns -ENOTTY.
2074  *
2075  * @dd  Pointer to the driver data structure.
2076  * @cmd IOCTL command passed from the Block Layer.
2077  * @arg IOCTL argument passed from the Block Layer.
2078  *
2079  * return value
2080  *      0       The IOCTL completed successfully.
2081  *      -ENOTTY The specified command is not supported.
2082  *      -EFAULT An error occurred copying data to a user space buffer.
2083  *      -EIO    An error occurred while executing the command.
2084  */
2085 static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
2086                          unsigned long arg)
2087 {
2088         switch (cmd) {
2089         case HDIO_GET_IDENTITY:
2090         {
2091                 if (copy_to_user((void __user *)arg, dd->port->identify,
2092                                                 sizeof(u16) * ATA_ID_WORDS))
2093                         return -EFAULT;
2094                 break;
2095         }
2096         case HDIO_DRIVE_CMD:
2097         {
2098                 u8 drive_command[4];
2099
2100                 /* Copy the user command info to our buffer. */
2101                 if (copy_from_user(drive_command,
2102                                          (void __user *) arg,
2103                                          sizeof(drive_command)))
2104                         return -EFAULT;
2105
2106                 /* Execute the drive command. */
2107                 if (exec_drive_command(dd->port,
2108                                          drive_command,
2109                                          (void __user *) (arg+4)))
2110                         return -EIO;
2111
2112                 /* Copy the status back to the users buffer. */
2113                 if (copy_to_user((void __user *) arg,
2114                                          drive_command,
2115                                          sizeof(drive_command)))
2116                         return -EFAULT;
2117
2118                 break;
2119         }
2120         case HDIO_DRIVE_TASK:
2121         {
2122                 u8 drive_command[7];
2123
2124                 /* Copy the user command info to our buffer. */
2125                 if (copy_from_user(drive_command,
2126                                          (void __user *) arg,
2127                                          sizeof(drive_command)))
2128                         return -EFAULT;
2129
2130                 /* Execute the drive command. */
2131                 if (exec_drive_task(dd->port, drive_command))
2132                         return -EIO;
2133
2134                 /* Copy the status back to the users buffer. */
2135                 if (copy_to_user((void __user *) arg,
2136                                          drive_command,
2137                                          sizeof(drive_command)))
2138                         return -EFAULT;
2139
2140                 break;
2141         }
2142         case HDIO_DRIVE_TASKFILE: {
2143                 ide_task_request_t req_task;
2144                 int ret, outtotal;
2145
2146                 if (copy_from_user(&req_task, (void __user *) arg,
2147                                         sizeof(req_task)))
2148                         return -EFAULT;
2149
2150                 outtotal = sizeof(req_task);
2151
2152                 ret = exec_drive_taskfile(dd, (void __user *) arg,
2153                                                 &req_task, outtotal);
2154
2155                 if (copy_to_user((void __user *) arg, &req_task,
2156                                                         sizeof(req_task)))
2157                         return -EFAULT;
2158
2159                 return ret;
2160         }
2161
2162         default:
2163                 return -EINVAL;
2164         }
2165         return 0;
2166 }
2167
2168 /*
2169  * Submit an IO to the hw
2170  *
2171  * This function is called by the block layer to issue an io
2172  * to the device. Upon completion, the callback function will
2173  * be called with the data parameter passed as the callback data.
2174  *
2175  * @dd       Pointer to the driver data structure.
2176  * @start    First sector to read.
2177  * @nsect    Number of sectors to read.
2178  * @nents    Number of entries in scatter list for the read command.
2179  * @tag      The tag of this read command.
2180  * @callback Pointer to the function that should be called
2181  *           when the read completes.
2182  * @data     Callback data passed to the callback function
2183  *           when the read completes.
2184  * @dir      Direction (read or write)
2185  *
2186  * return value
2187  *      None
2188  */
2189 static void mtip_hw_submit_io(struct driver_data *dd, struct request *rq,
2190                               struct mtip_cmd *command, int nents,
2191                               struct blk_mq_hw_ctx *hctx)
2192 {
2193         struct host_to_dev_fis  *fis;
2194         struct mtip_port *port = dd->port;
2195         int dma_dir = rq_data_dir(rq) == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2196         u64 start = blk_rq_pos(rq);
2197         unsigned int nsect = blk_rq_sectors(rq);
2198
2199         /* Map the scatter list for DMA access */
2200         nents = dma_map_sg(&dd->pdev->dev, command->sg, nents, dma_dir);
2201
2202         prefetch(&port->flags);
2203
2204         command->scatter_ents = nents;
2205
2206         /*
2207          * The number of retries for this command before it is
2208          * reported as a failure to the upper layers.
2209          */
2210         command->retries = MTIP_MAX_RETRIES;
2211
2212         /* Fill out fis */
2213         fis = command->command;
2214         fis->type        = 0x27;
2215         fis->opts        = 1 << 7;
2216         if (dma_dir == DMA_FROM_DEVICE)
2217                 fis->command = ATA_CMD_FPDMA_READ;
2218         else
2219                 fis->command = ATA_CMD_FPDMA_WRITE;
2220         fis->lba_low     = start & 0xFF;
2221         fis->lba_mid     = (start >> 8) & 0xFF;
2222         fis->lba_hi      = (start >> 16) & 0xFF;
2223         fis->lba_low_ex  = (start >> 24) & 0xFF;
2224         fis->lba_mid_ex  = (start >> 32) & 0xFF;
2225         fis->lba_hi_ex   = (start >> 40) & 0xFF;
2226         fis->device      = 1 << 6;
2227         fis->features    = nsect & 0xFF;
2228         fis->features_ex = (nsect >> 8) & 0xFF;
2229         fis->sect_count  = ((rq->tag << 3) | (rq->tag >> 5));
2230         fis->sect_cnt_ex = 0;
2231         fis->control     = 0;
2232         fis->res2        = 0;
2233         fis->res3        = 0;
2234         fill_command_sg(dd, command, nents);
2235
2236         if (unlikely(command->unaligned))
2237                 fis->device |= 1 << 7;
2238
2239         /* Populate the command header */
2240         command->command_header->opts =
2241                         __force_bit2int cpu_to_le32(
2242                                 (nents << 16) | 5 | AHCI_CMD_PREFETCH);
2243         command->command_header->byte_count = 0;
2244
2245         command->direction = dma_dir;
2246
2247         /*
2248          * To prevent this command from being issued
2249          * if an internal command is in progress or error handling is active.
2250          */
2251         if (unlikely(port->flags & MTIP_PF_PAUSE_IO)) {
2252                 set_bit(rq->tag, port->cmds_to_issue);
2253                 set_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2254                 return;
2255         }
2256
2257         /* Issue the command to the hardware */
2258         mtip_issue_ncq_command(port, rq->tag);
2259 }
2260
2261 /*
2262  * Sysfs status dump.
2263  *
2264  * @dev  Pointer to the device structure, passed by the kernrel.
2265  * @attr Pointer to the device_attribute structure passed by the kernel.
2266  * @buf  Pointer to the char buffer that will receive the stats info.
2267  *
2268  * return value
2269  *      The size, in bytes, of the data copied into buf.
2270  */
2271 static ssize_t mtip_hw_show_status(struct device *dev,
2272                                 struct device_attribute *attr,
2273                                 char *buf)
2274 {
2275         struct driver_data *dd = dev_to_disk(dev)->private_data;
2276         int size = 0;
2277
2278         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
2279                 size += sprintf(buf, "%s", "thermal_shutdown\n");
2280         else if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag))
2281                 size += sprintf(buf, "%s", "write_protect\n");
2282         else
2283                 size += sprintf(buf, "%s", "online\n");
2284
2285         return size;
2286 }
2287
2288 static DEVICE_ATTR(status, 0444, mtip_hw_show_status, NULL);
2289
2290 /* debugsfs entries */
2291
2292 static ssize_t show_device_status(struct device_driver *drv, char *buf)
2293 {
2294         int size = 0;
2295         struct driver_data *dd, *tmp;
2296         unsigned long flags;
2297         char id_buf[42];
2298         u16 status = 0;
2299
2300         spin_lock_irqsave(&dev_lock, flags);
2301         size += sprintf(&buf[size], "Devices Present:\n");
2302         list_for_each_entry_safe(dd, tmp, &online_list, online_list) {
2303                 if (dd->pdev) {
2304                         if (dd->port &&
2305                             dd->port->identify &&
2306                             dd->port->identify_valid) {
2307                                 strlcpy(id_buf,
2308                                         (char *) (dd->port->identify + 10), 21);
2309                                 status = *(dd->port->identify + 141);
2310                         } else {
2311                                 memset(id_buf, 0, 42);
2312                                 status = 0;
2313                         }
2314
2315                         if (dd->port &&
2316                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2317                                 size += sprintf(&buf[size],
2318                                         " device %s %s (ftl rebuild %d %%)\n",
2319                                         dev_name(&dd->pdev->dev),
2320                                         id_buf,
2321                                         status);
2322                         } else {
2323                                 size += sprintf(&buf[size],
2324                                         " device %s %s\n",
2325                                         dev_name(&dd->pdev->dev),
2326                                         id_buf);
2327                         }
2328                 }
2329         }
2330
2331         size += sprintf(&buf[size], "Devices Being Removed:\n");
2332         list_for_each_entry_safe(dd, tmp, &removing_list, remove_list) {
2333                 if (dd->pdev) {
2334                         if (dd->port &&
2335                             dd->port->identify &&
2336                             dd->port->identify_valid) {
2337                                 strlcpy(id_buf,
2338                                         (char *) (dd->port->identify+10), 21);
2339                                 status = *(dd->port->identify + 141);
2340                         } else {
2341                                 memset(id_buf, 0, 42);
2342                                 status = 0;
2343                         }
2344
2345                         if (dd->port &&
2346                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2347                                 size += sprintf(&buf[size],
2348                                         " device %s %s (ftl rebuild %d %%)\n",
2349                                         dev_name(&dd->pdev->dev),
2350                                         id_buf,
2351                                         status);
2352                         } else {
2353                                 size += sprintf(&buf[size],
2354                                         " device %s %s\n",
2355                                         dev_name(&dd->pdev->dev),
2356                                         id_buf);
2357                         }
2358                 }
2359         }
2360         spin_unlock_irqrestore(&dev_lock, flags);
2361
2362         return size;
2363 }
2364
2365 static ssize_t mtip_hw_read_device_status(struct file *f, char __user *ubuf,
2366                                                 size_t len, loff_t *offset)
2367 {
2368         struct driver_data *dd =  (struct driver_data *)f->private_data;
2369         int size = *offset;
2370         char *buf;
2371         int rv = 0;
2372
2373         if (!len || *offset)
2374                 return 0;
2375
2376         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2377         if (!buf) {
2378                 dev_err(&dd->pdev->dev,
2379                         "Memory allocation: status buffer\n");
2380                 return -ENOMEM;
2381         }
2382
2383         size += show_device_status(NULL, buf);
2384
2385         *offset = size <= len ? size : len;
2386         size = copy_to_user(ubuf, buf, *offset);
2387         if (size)
2388                 rv = -EFAULT;
2389
2390         kfree(buf);
2391         return rv ? rv : *offset;
2392 }
2393
2394 static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
2395                                   size_t len, loff_t *offset)
2396 {
2397         struct driver_data *dd =  (struct driver_data *)f->private_data;
2398         char *buf;
2399         u32 group_allocated;
2400         int size = *offset;
2401         int n, rv = 0;
2402
2403         if (!len || size)
2404                 return 0;
2405
2406         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2407         if (!buf) {
2408                 dev_err(&dd->pdev->dev,
2409                         "Memory allocation: register buffer\n");
2410                 return -ENOMEM;
2411         }
2412
2413         size += sprintf(&buf[size], "H/ S ACTive      : [ 0x");
2414
2415         for (n = dd->slot_groups-1; n >= 0; n--)
2416                 size += sprintf(&buf[size], "%08X ",
2417                                          readl(dd->port->s_active[n]));
2418
2419         size += sprintf(&buf[size], "]\n");
2420         size += sprintf(&buf[size], "H/ Command Issue : [ 0x");
2421
2422         for (n = dd->slot_groups-1; n >= 0; n--)
2423                 size += sprintf(&buf[size], "%08X ",
2424                                         readl(dd->port->cmd_issue[n]));
2425
2426         size += sprintf(&buf[size], "]\n");
2427         size += sprintf(&buf[size], "H/ Completed     : [ 0x");
2428
2429         for (n = dd->slot_groups-1; n >= 0; n--)
2430                 size += sprintf(&buf[size], "%08X ",
2431                                 readl(dd->port->completed[n]));
2432
2433         size += sprintf(&buf[size], "]\n");
2434         size += sprintf(&buf[size], "H/ PORT IRQ STAT : [ 0x%08X ]\n",
2435                                 readl(dd->port->mmio + PORT_IRQ_STAT));
2436         size += sprintf(&buf[size], "H/ HOST IRQ STAT : [ 0x%08X ]\n",
2437                                 readl(dd->mmio + HOST_IRQ_STAT));
2438         size += sprintf(&buf[size], "\n");
2439
2440         size += sprintf(&buf[size], "L/ Commands in Q : [ 0x");
2441
2442         for (n = dd->slot_groups-1; n >= 0; n--) {
2443                 if (sizeof(long) > sizeof(u32))
2444                         group_allocated =
2445                                 dd->port->cmds_to_issue[n/2] >> (32*(n&1));
2446                 else
2447                         group_allocated = dd->port->cmds_to_issue[n];
2448                 size += sprintf(&buf[size], "%08X ", group_allocated);
2449         }
2450         size += sprintf(&buf[size], "]\n");
2451
2452         *offset = size <= len ? size : len;
2453         size = copy_to_user(ubuf, buf, *offset);
2454         if (size)
2455                 rv = -EFAULT;
2456
2457         kfree(buf);
2458         return rv ? rv : *offset;
2459 }
2460
2461 static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
2462                                   size_t len, loff_t *offset)
2463 {
2464         struct driver_data *dd =  (struct driver_data *)f->private_data;
2465         char *buf;
2466         int size = *offset;
2467         int rv = 0;
2468
2469         if (!len || size)
2470                 return 0;
2471
2472         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2473         if (!buf) {
2474                 dev_err(&dd->pdev->dev,
2475                         "Memory allocation: flag buffer\n");
2476                 return -ENOMEM;
2477         }
2478
2479         size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
2480                                                         dd->port->flags);
2481         size += sprintf(&buf[size], "Flag-dd   : [ %08lX ]\n",
2482                                                         dd->dd_flag);
2483
2484         *offset = size <= len ? size : len;
2485         size = copy_to_user(ubuf, buf, *offset);
2486         if (size)
2487                 rv = -EFAULT;
2488
2489         kfree(buf);
2490         return rv ? rv : *offset;
2491 }
2492
2493 static const struct file_operations mtip_device_status_fops = {
2494         .owner  = THIS_MODULE,
2495         .open   = simple_open,
2496         .read   = mtip_hw_read_device_status,
2497         .llseek = no_llseek,
2498 };
2499
2500 static const struct file_operations mtip_regs_fops = {
2501         .owner  = THIS_MODULE,
2502         .open   = simple_open,
2503         .read   = mtip_hw_read_registers,
2504         .llseek = no_llseek,
2505 };
2506
2507 static const struct file_operations mtip_flags_fops = {
2508         .owner  = THIS_MODULE,
2509         .open   = simple_open,
2510         .read   = mtip_hw_read_flags,
2511         .llseek = no_llseek,
2512 };
2513
2514 /*
2515  * Create the sysfs related attributes.
2516  *
2517  * @dd   Pointer to the driver data structure.
2518  * @kobj Pointer to the kobj for the block device.
2519  *
2520  * return value
2521  *      0       Operation completed successfully.
2522  *      -EINVAL Invalid parameter.
2523  */
2524 static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
2525 {
2526         if (!kobj || !dd)
2527                 return -EINVAL;
2528
2529         if (sysfs_create_file(kobj, &dev_attr_status.attr))
2530                 dev_warn(&dd->pdev->dev,
2531                         "Error creating 'status' sysfs entry\n");
2532         return 0;
2533 }
2534
2535 /*
2536  * Remove the sysfs related attributes.
2537  *
2538  * @dd   Pointer to the driver data structure.
2539  * @kobj Pointer to the kobj for the block device.
2540  *
2541  * return value
2542  *      0       Operation completed successfully.
2543  *      -EINVAL Invalid parameter.
2544  */
2545 static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
2546 {
2547         if (!kobj || !dd)
2548                 return -EINVAL;
2549
2550         sysfs_remove_file(kobj, &dev_attr_status.attr);
2551
2552         return 0;
2553 }
2554
2555 static int mtip_hw_debugfs_init(struct driver_data *dd)
2556 {
2557         if (!dfs_parent)
2558                 return -1;
2559
2560         dd->dfs_node = debugfs_create_dir(dd->disk->disk_name, dfs_parent);
2561         if (IS_ERR_OR_NULL(dd->dfs_node)) {
2562                 dev_warn(&dd->pdev->dev,
2563                         "Error creating node %s under debugfs\n",
2564                                                 dd->disk->disk_name);
2565                 dd->dfs_node = NULL;
2566                 return -1;
2567         }
2568
2569         debugfs_create_file("flags", 0444, dd->dfs_node, dd, &mtip_flags_fops);
2570         debugfs_create_file("registers", 0444, dd->dfs_node, dd,
2571                             &mtip_regs_fops);
2572
2573         return 0;
2574 }
2575
2576 static void mtip_hw_debugfs_exit(struct driver_data *dd)
2577 {
2578         debugfs_remove_recursive(dd->dfs_node);
2579 }
2580
2581 /*
2582  * Perform any init/resume time hardware setup
2583  *
2584  * @dd Pointer to the driver data structure.
2585  *
2586  * return value
2587  *      None
2588  */
2589 static inline void hba_setup(struct driver_data *dd)
2590 {
2591         u32 hwdata;
2592         hwdata = readl(dd->mmio + HOST_HSORG);
2593
2594         /* interrupt bug workaround: use only 1 IS bit.*/
2595         writel(hwdata |
2596                 HSORG_DISABLE_SLOTGRP_INTR |
2597                 HSORG_DISABLE_SLOTGRP_PXIS,
2598                 dd->mmio + HOST_HSORG);
2599 }
2600
2601 static int mtip_device_unaligned_constrained(struct driver_data *dd)
2602 {
2603         return (dd->pdev->device == P420M_DEVICE_ID ? 1 : 0);
2604 }
2605
2606 /*
2607  * Detect the details of the product, and store anything needed
2608  * into the driver data structure.  This includes product type and
2609  * version and number of slot groups.
2610  *
2611  * @dd Pointer to the driver data structure.
2612  *
2613  * return value
2614  *      None
2615  */
2616 static void mtip_detect_product(struct driver_data *dd)
2617 {
2618         u32 hwdata;
2619         unsigned int rev, slotgroups;
2620
2621         /*
2622          * HBA base + 0xFC [15:0] - vendor-specific hardware interface
2623          * info register:
2624          * [15:8] hardware/software interface rev#
2625          * [   3] asic-style interface
2626          * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
2627          */
2628         hwdata = readl(dd->mmio + HOST_HSORG);
2629
2630         dd->product_type = MTIP_PRODUCT_UNKNOWN;
2631         dd->slot_groups = 1;
2632
2633         if (hwdata & 0x8) {
2634                 dd->product_type = MTIP_PRODUCT_ASICFPGA;
2635                 rev = (hwdata & HSORG_HWREV) >> 8;
2636                 slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
2637                 dev_info(&dd->pdev->dev,
2638                         "ASIC-FPGA design, HS rev 0x%x, "
2639                         "%i slot groups [%i slots]\n",
2640                          rev,
2641                          slotgroups,
2642                          slotgroups * 32);
2643
2644                 if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
2645                         dev_warn(&dd->pdev->dev,
2646                                 "Warning: driver only supports "
2647                                 "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
2648                         slotgroups = MTIP_MAX_SLOT_GROUPS;
2649                 }
2650                 dd->slot_groups = slotgroups;
2651                 return;
2652         }
2653
2654         dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
2655 }
2656
2657 /*
2658  * Blocking wait for FTL rebuild to complete
2659  *
2660  * @dd Pointer to the DRIVER_DATA structure.
2661  *
2662  * return value
2663  *      0       FTL rebuild completed successfully
2664  *      -EFAULT FTL rebuild error/timeout/interruption
2665  */
2666 static int mtip_ftl_rebuild_poll(struct driver_data *dd)
2667 {
2668         unsigned long timeout, cnt = 0, start;
2669
2670         dev_warn(&dd->pdev->dev,
2671                 "FTL rebuild in progress. Polling for completion.\n");
2672
2673         start = jiffies;
2674         timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
2675
2676         do {
2677                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2678                                 &dd->dd_flag)))
2679                         return -EFAULT;
2680                 if (mtip_check_surprise_removal(dd->pdev))
2681                         return -EFAULT;
2682
2683                 if (mtip_get_identify(dd->port, NULL) < 0)
2684                         return -EFAULT;
2685
2686                 if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2687                         MTIP_FTL_REBUILD_MAGIC) {
2688                         ssleep(1);
2689                         /* Print message every 3 minutes */
2690                         if (cnt++ >= 180) {
2691                                 dev_warn(&dd->pdev->dev,
2692                                 "FTL rebuild in progress (%d secs).\n",
2693                                 jiffies_to_msecs(jiffies - start) / 1000);
2694                                 cnt = 0;
2695                         }
2696                 } else {
2697                         dev_warn(&dd->pdev->dev,
2698                                 "FTL rebuild complete (%d secs).\n",
2699                         jiffies_to_msecs(jiffies - start) / 1000);
2700                         mtip_block_initialize(dd);
2701                         return 0;
2702                 }
2703         } while (time_before(jiffies, timeout));
2704
2705         /* Check for timeout */
2706         dev_err(&dd->pdev->dev,
2707                 "Timed out waiting for FTL rebuild to complete (%d secs).\n",
2708                 jiffies_to_msecs(jiffies - start) / 1000);
2709         return -EFAULT;
2710 }
2711
2712 static void mtip_softirq_done_fn(struct request *rq)
2713 {
2714         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
2715         struct driver_data *dd = rq->q->queuedata;
2716
2717         /* Unmap the DMA scatter list entries */
2718         dma_unmap_sg(&dd->pdev->dev, cmd->sg, cmd->scatter_ents,
2719                                                         cmd->direction);
2720
2721         if (unlikely(cmd->unaligned))
2722                 up(&dd->port->cmd_slot_unal);
2723
2724         blk_mq_end_request(rq, cmd->status);
2725 }
2726
2727 static void mtip_abort_cmd(struct request *req, void *data, bool reserved)
2728 {
2729         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(req);
2730         struct driver_data *dd = data;
2731
2732         dbg_printk(MTIP_DRV_NAME " Aborting request, tag = %d\n", req->tag);
2733
2734         clear_bit(req->tag, dd->port->cmds_to_issue);
2735         cmd->status = BLK_STS_IOERR;
2736         mtip_softirq_done_fn(req);
2737 }
2738
2739 static void mtip_queue_cmd(struct request *req, void *data, bool reserved)
2740 {
2741         struct driver_data *dd = data;
2742
2743         set_bit(req->tag, dd->port->cmds_to_issue);
2744         blk_abort_request(req);
2745 }
2746
2747 /*
2748  * service thread to issue queued commands
2749  *
2750  * @data Pointer to the driver data structure.
2751  *
2752  * return value
2753  *      0
2754  */
2755
2756 static int mtip_service_thread(void *data)
2757 {
2758         struct driver_data *dd = (struct driver_data *)data;
2759         unsigned long slot, slot_start, slot_wrap, to;
2760         unsigned int num_cmd_slots = dd->slot_groups * 32;
2761         struct mtip_port *port = dd->port;
2762
2763         while (1) {
2764                 if (kthread_should_stop() ||
2765                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2766                         goto st_out;
2767                 clear_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2768
2769                 /*
2770                  * the condition is to check neither an internal command is
2771                  * is in progress nor error handling is active
2772                  */
2773                 wait_event_interruptible(port->svc_wait, (port->flags) &&
2774                         (port->flags & MTIP_PF_SVC_THD_WORK));
2775
2776                 if (kthread_should_stop() ||
2777                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2778                         goto st_out;
2779
2780                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2781                                 &dd->dd_flag)))
2782                         goto st_out;
2783
2784                 set_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2785
2786 restart_eh:
2787                 /* Demux bits: start with error handling */
2788                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags)) {
2789                         mtip_handle_tfe(dd);
2790                         clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
2791                 }
2792
2793                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags))
2794                         goto restart_eh;
2795
2796                 if (test_bit(MTIP_PF_TO_ACTIVE_BIT, &port->flags)) {
2797                         to = jiffies + msecs_to_jiffies(5000);
2798
2799                         do {
2800                                 mdelay(100);
2801                         } while (atomic_read(&dd->irq_workers_active) != 0 &&
2802                                 time_before(jiffies, to));
2803
2804                         if (atomic_read(&dd->irq_workers_active) != 0)
2805                                 dev_warn(&dd->pdev->dev,
2806                                         "Completion workers still active!");
2807
2808                         blk_mq_quiesce_queue(dd->queue);
2809
2810                         spin_lock(dd->queue->queue_lock);
2811                         blk_mq_tagset_busy_iter(&dd->tags,
2812                                                         mtip_queue_cmd, dd);
2813                         spin_unlock(dd->queue->queue_lock);
2814
2815                         set_bit(MTIP_PF_ISSUE_CMDS_BIT, &dd->port->flags);
2816
2817                         if (mtip_device_reset(dd))
2818                                 blk_mq_tagset_busy_iter(&dd->tags,
2819                                                         mtip_abort_cmd, dd);
2820
2821                         clear_bit(MTIP_PF_TO_ACTIVE_BIT, &dd->port->flags);
2822
2823                         blk_mq_unquiesce_queue(dd->queue);
2824                 }
2825
2826                 if (test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
2827                         slot = 1;
2828                         /* used to restrict the loop to one iteration */
2829                         slot_start = num_cmd_slots;
2830                         slot_wrap = 0;
2831                         while (1) {
2832                                 slot = find_next_bit(port->cmds_to_issue,
2833                                                 num_cmd_slots, slot);
2834                                 if (slot_wrap == 1) {
2835                                         if ((slot_start >= slot) ||
2836                                                 (slot >= num_cmd_slots))
2837                                                 break;
2838                                 }
2839                                 if (unlikely(slot_start == num_cmd_slots))
2840                                         slot_start = slot;
2841
2842                                 if (unlikely(slot == num_cmd_slots)) {
2843                                         slot = 1;
2844                                         slot_wrap = 1;
2845                                         continue;
2846                                 }
2847
2848                                 /* Issue the command to the hardware */
2849                                 mtip_issue_ncq_command(port, slot);
2850
2851                                 clear_bit(slot, port->cmds_to_issue);
2852                         }
2853
2854                         clear_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2855                 }
2856
2857                 if (test_bit(MTIP_PF_REBUILD_BIT, &port->flags)) {
2858                         if (mtip_ftl_rebuild_poll(dd) == 0)
2859                                 clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
2860                 }
2861         }
2862
2863 st_out:
2864         return 0;
2865 }
2866
2867 /*
2868  * DMA region teardown
2869  *
2870  * @dd Pointer to driver_data structure
2871  *
2872  * return value
2873  *      None
2874  */
2875 static void mtip_dma_free(struct driver_data *dd)
2876 {
2877         struct mtip_port *port = dd->port;
2878
2879         if (port->block1)
2880                 dmam_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2881                                         port->block1, port->block1_dma);
2882
2883         if (port->command_list) {
2884                 dmam_free_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
2885                                 port->command_list, port->command_list_dma);
2886         }
2887 }
2888
2889 /*
2890  * DMA region setup
2891  *
2892  * @dd Pointer to driver_data structure
2893  *
2894  * return value
2895  *      -ENOMEM Not enough free DMA region space to initialize driver
2896  */
2897 static int mtip_dma_alloc(struct driver_data *dd)
2898 {
2899         struct mtip_port *port = dd->port;
2900
2901         /* Allocate dma memory for RX Fis, Identify, and Sector Bufffer */
2902         port->block1 =
2903                 dmam_alloc_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2904                                         &port->block1_dma, GFP_KERNEL);
2905         if (!port->block1)
2906                 return -ENOMEM;
2907         memset(port->block1, 0, BLOCK_DMA_ALLOC_SZ);
2908
2909         /* Allocate dma memory for command list */
2910         port->command_list =
2911                 dmam_alloc_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
2912                                         &port->command_list_dma, GFP_KERNEL);
2913         if (!port->command_list) {
2914                 dmam_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
2915                                         port->block1, port->block1_dma);
2916                 port->block1 = NULL;
2917                 port->block1_dma = 0;
2918                 return -ENOMEM;
2919         }
2920         memset(port->command_list, 0, AHCI_CMD_TBL_SZ);
2921
2922         /* Setup all pointers into first DMA region */
2923         port->rxfis         = port->block1 + AHCI_RX_FIS_OFFSET;
2924         port->rxfis_dma     = port->block1_dma + AHCI_RX_FIS_OFFSET;
2925         port->identify      = port->block1 + AHCI_IDFY_OFFSET;
2926         port->identify_dma  = port->block1_dma + AHCI_IDFY_OFFSET;
2927         port->log_buf       = port->block1 + AHCI_SECTBUF_OFFSET;
2928         port->log_buf_dma   = port->block1_dma + AHCI_SECTBUF_OFFSET;
2929         port->smart_buf     = port->block1 + AHCI_SMARTBUF_OFFSET;
2930         port->smart_buf_dma = port->block1_dma + AHCI_SMARTBUF_OFFSET;
2931
2932         return 0;
2933 }
2934
2935 static int mtip_hw_get_identify(struct driver_data *dd)
2936 {
2937         struct smart_attr attr242;
2938         unsigned char *buf;
2939         int rv;
2940
2941         if (mtip_get_identify(dd->port, NULL) < 0)
2942                 return -EFAULT;
2943
2944         if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2945                 MTIP_FTL_REBUILD_MAGIC) {
2946                 set_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags);
2947                 return MTIP_FTL_REBUILD_MAGIC;
2948         }
2949         mtip_dump_identify(dd->port);
2950
2951         /* check write protect, over temp and rebuild statuses */
2952         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
2953                                 dd->port->log_buf,
2954                                 dd->port->log_buf_dma, 1);
2955         if (rv) {
2956                 dev_warn(&dd->pdev->dev,
2957                         "Error in READ LOG EXT (10h) command\n");
2958                 /* non-critical error, don't fail the load */
2959         } else {
2960                 buf = (unsigned char *)dd->port->log_buf;
2961                 if (buf[259] & 0x1) {
2962                         dev_info(&dd->pdev->dev,
2963                                 "Write protect bit is set.\n");
2964                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
2965                 }
2966                 if (buf[288] == 0xF7) {
2967                         dev_info(&dd->pdev->dev,
2968                                 "Exceeded Tmax, drive in thermal shutdown.\n");
2969                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
2970                 }
2971                 if (buf[288] == 0xBF) {
2972                         dev_info(&dd->pdev->dev,
2973                                 "Drive indicates rebuild has failed.\n");
2974                         set_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag);
2975                 }
2976         }
2977
2978         /* get write protect progess */
2979         memset(&attr242, 0, sizeof(struct smart_attr));
2980         if (mtip_get_smart_attr(dd->port, 242, &attr242))
2981                 dev_warn(&dd->pdev->dev,
2982                                 "Unable to check write protect progress\n");
2983         else
2984                 dev_info(&dd->pdev->dev,
2985                                 "Write protect progress: %u%% (%u blocks)\n",
2986                                 attr242.cur, le32_to_cpu(attr242.data));
2987
2988         return rv;
2989 }
2990
2991 /*
2992  * Called once for each card.
2993  *
2994  * @dd Pointer to the driver data structure.
2995  *
2996  * return value
2997  *      0 on success, else an error code.
2998  */
2999 static int mtip_hw_init(struct driver_data *dd)
3000 {
3001         int i;
3002         int rv;
3003         unsigned long timeout, timetaken;
3004
3005         dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
3006
3007         mtip_detect_product(dd);
3008         if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
3009                 rv = -EIO;
3010                 goto out1;
3011         }
3012
3013         hba_setup(dd);
3014
3015         dd->port = kzalloc_node(sizeof(struct mtip_port), GFP_KERNEL,
3016                                 dd->numa_node);
3017         if (!dd->port) {
3018                 dev_err(&dd->pdev->dev,
3019                         "Memory allocation: port structure\n");
3020                 return -ENOMEM;
3021         }
3022
3023         /* Continue workqueue setup */
3024         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
3025                 dd->work[i].port = dd->port;
3026
3027         /* Enable unaligned IO constraints for some devices */
3028         if (mtip_device_unaligned_constrained(dd))
3029                 dd->unal_qdepth = MTIP_MAX_UNALIGNED_SLOTS;
3030         else
3031                 dd->unal_qdepth = 0;
3032
3033         sema_init(&dd->port->cmd_slot_unal, dd->unal_qdepth);
3034
3035         /* Spinlock to prevent concurrent issue */
3036         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
3037                 spin_lock_init(&dd->port->cmd_issue_lock[i]);
3038
3039         /* Set the port mmio base address. */
3040         dd->port->mmio  = dd->mmio + PORT_OFFSET;
3041         dd->port->dd    = dd;
3042
3043         /* DMA allocations */
3044         rv = mtip_dma_alloc(dd);
3045         if (rv < 0)
3046                 goto out1;
3047
3048         /* Setup the pointers to the extended s_active and CI registers. */
3049         for (i = 0; i < dd->slot_groups; i++) {
3050                 dd->port->s_active[i] =
3051                         dd->port->mmio + i*0x80 + PORT_SCR_ACT;
3052                 dd->port->cmd_issue[i] =
3053                         dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
3054                 dd->port->completed[i] =
3055                         dd->port->mmio + i*0x80 + PORT_SDBV;
3056         }
3057
3058         timetaken = jiffies;
3059         timeout = jiffies + msecs_to_jiffies(30000);
3060         while (((readl(dd->port->mmio + PORT_SCR_STAT) & 0x0F) != 0x03) &&
3061                  time_before(jiffies, timeout)) {
3062                 mdelay(100);
3063         }
3064         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
3065                 timetaken = jiffies - timetaken;
3066                 dev_warn(&dd->pdev->dev,
3067                         "Surprise removal detected at %u ms\n",
3068                         jiffies_to_msecs(timetaken));
3069                 rv = -ENODEV;
3070                 goto out2 ;
3071         }
3072         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
3073                 timetaken = jiffies - timetaken;
3074                 dev_warn(&dd->pdev->dev,
3075                         "Removal detected at %u ms\n",
3076                         jiffies_to_msecs(timetaken));
3077                 rv = -EFAULT;
3078                 goto out2;
3079         }
3080
3081         /* Conditionally reset the HBA. */
3082         if (!(readl(dd->mmio + HOST_CAP) & HOST_CAP_NZDMA)) {
3083                 if (mtip_hba_reset(dd) < 0) {
3084                         dev_err(&dd->pdev->dev,
3085                                 "Card did not reset within timeout\n");
3086                         rv = -EIO;
3087                         goto out2;
3088                 }
3089         } else {
3090                 /* Clear any pending interrupts on the HBA */
3091                 writel(readl(dd->mmio + HOST_IRQ_STAT),
3092                         dd->mmio + HOST_IRQ_STAT);
3093         }
3094
3095         mtip_init_port(dd->port);
3096         mtip_start_port(dd->port);
3097
3098         /* Setup the ISR and enable interrupts. */
3099         rv = devm_request_irq(&dd->pdev->dev,
3100                                 dd->pdev->irq,
3101                                 mtip_irq_handler,
3102                                 IRQF_SHARED,
3103                                 dev_driver_string(&dd->pdev->dev),
3104                                 dd);
3105
3106         if (rv) {
3107                 dev_err(&dd->pdev->dev,
3108                         "Unable to allocate IRQ %d\n", dd->pdev->irq);
3109                 goto out2;
3110         }
3111         irq_set_affinity_hint(dd->pdev->irq, get_cpu_mask(dd->isr_binding));
3112
3113         /* Enable interrupts on the HBA. */
3114         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3115                                         dd->mmio + HOST_CTL);
3116
3117         init_waitqueue_head(&dd->port->svc_wait);
3118
3119         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
3120                 rv = -EFAULT;
3121                 goto out3;
3122         }
3123
3124         return rv;
3125
3126 out3:
3127         /* Disable interrupts on the HBA. */
3128         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3129                         dd->mmio + HOST_CTL);
3130
3131         /* Release the IRQ. */
3132         irq_set_affinity_hint(dd->pdev->irq, NULL);
3133         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3134
3135 out2:
3136         mtip_deinit_port(dd->port);
3137         mtip_dma_free(dd);
3138
3139 out1:
3140         /* Free the memory allocated for the for structure. */
3141         kfree(dd->port);
3142
3143         return rv;
3144 }
3145
3146 static int mtip_standby_drive(struct driver_data *dd)
3147 {
3148         int rv = 0;
3149
3150         if (dd->sr || !dd->port)
3151                 return -ENODEV;
3152         /*
3153          * Send standby immediate (E0h) to the drive so that it
3154          * saves its state.
3155          */
3156         if (!test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags) &&
3157             !test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag) &&
3158             !test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag)) {
3159                 rv = mtip_standby_immediate(dd->port);
3160                 if (rv)
3161                         dev_warn(&dd->pdev->dev,
3162                                 "STANDBY IMMEDIATE failed\n");
3163         }
3164         return rv;
3165 }
3166
3167 /*
3168  * Called to deinitialize an interface.
3169  *
3170  * @dd Pointer to the driver data structure.
3171  *
3172  * return value
3173  *      0
3174  */
3175 static int mtip_hw_exit(struct driver_data *dd)
3176 {
3177         if (!dd->sr) {
3178                 /* de-initialize the port. */
3179                 mtip_deinit_port(dd->port);
3180
3181                 /* Disable interrupts on the HBA. */
3182                 writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3183                                 dd->mmio + HOST_CTL);
3184         }
3185
3186         /* Release the IRQ. */
3187         irq_set_affinity_hint(dd->pdev->irq, NULL);
3188         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3189         msleep(1000);
3190
3191         /* Free dma regions */
3192         mtip_dma_free(dd);
3193
3194         /* Free the memory allocated for the for structure. */
3195         kfree(dd->port);
3196         dd->port = NULL;
3197
3198         return 0;
3199 }
3200
3201 /*
3202  * Issue a Standby Immediate command to the device.
3203  *
3204  * This function is called by the Block Layer just before the
3205  * system powers off during a shutdown.
3206  *
3207  * @dd Pointer to the driver data structure.
3208  *
3209  * return value
3210  *      0
3211  */
3212 static int mtip_hw_shutdown(struct driver_data *dd)
3213 {
3214         /*
3215          * Send standby immediate (E0h) to the drive so that it
3216          * saves its state.
3217          */
3218         mtip_standby_drive(dd);
3219
3220         return 0;
3221 }
3222
3223 /*
3224  * Suspend function
3225  *
3226  * This function is called by the Block Layer just before the
3227  * system hibernates.
3228  *
3229  * @dd Pointer to the driver data structure.
3230  *
3231  * return value
3232  *      0       Suspend was successful
3233  *      -EFAULT Suspend was not successful
3234  */
3235 static int mtip_hw_suspend(struct driver_data *dd)
3236 {
3237         /*
3238          * Send standby immediate (E0h) to the drive
3239          * so that it saves its state.
3240          */
3241         if (mtip_standby_drive(dd) != 0) {
3242                 dev_err(&dd->pdev->dev,
3243                         "Failed standby-immediate command\n");
3244                 return -EFAULT;
3245         }
3246
3247         /* Disable interrupts on the HBA.*/
3248         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3249                         dd->mmio + HOST_CTL);
3250         mtip_deinit_port(dd->port);
3251
3252         return 0;
3253 }
3254
3255 /*
3256  * Resume function
3257  *
3258  * This function is called by the Block Layer as the
3259  * system resumes.
3260  *
3261  * @dd Pointer to the driver data structure.
3262  *
3263  * return value
3264  *      0       Resume was successful
3265  *      -EFAULT Resume was not successful
3266  */
3267 static int mtip_hw_resume(struct driver_data *dd)
3268 {
3269         /* Perform any needed hardware setup steps */
3270         hba_setup(dd);
3271
3272         /* Reset the HBA */
3273         if (mtip_hba_reset(dd) != 0) {
3274                 dev_err(&dd->pdev->dev,
3275                         "Unable to reset the HBA\n");
3276                 return -EFAULT;
3277         }
3278
3279         /*
3280          * Enable the port, DMA engine, and FIS reception specific
3281          * h/w in controller.
3282          */
3283         mtip_init_port(dd->port);
3284         mtip_start_port(dd->port);
3285
3286         /* Enable interrupts on the HBA.*/
3287         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3288                         dd->mmio + HOST_CTL);
3289
3290         return 0;
3291 }
3292
3293 /*
3294  * Helper function for reusing disk name
3295  * upon hot insertion.
3296  */
3297 static int rssd_disk_name_format(char *prefix,
3298                                  int index,
3299                                  char *buf,
3300                                  int buflen)
3301 {
3302         const int base = 'z' - 'a' + 1;
3303         char *begin = buf + strlen(prefix);
3304         char *end = buf + buflen;
3305         char *p;
3306         int unit;
3307
3308         p = end - 1;
3309         *p = '\0';
3310         unit = base;
3311         do {
3312                 if (p == begin)
3313                         return -EINVAL;
3314                 *--p = 'a' + (index % unit);
3315                 index = (index / unit) - 1;
3316         } while (index >= 0);
3317
3318         memmove(begin, p, end - p);
3319         memcpy(buf, prefix, strlen(prefix));
3320
3321         return 0;
3322 }
3323
3324 /*
3325  * Block layer IOCTL handler.
3326  *
3327  * @dev Pointer to the block_device structure.
3328  * @mode ignored
3329  * @cmd IOCTL command passed from the user application.
3330  * @arg Argument passed from the user application.
3331  *
3332  * return value
3333  *      0        IOCTL completed successfully.
3334  *      -ENOTTY  IOCTL not supported or invalid driver data
3335  *                 structure pointer.
3336  */
3337 static int mtip_block_ioctl(struct block_device *dev,
3338                             fmode_t mode,
3339                             unsigned cmd,
3340                             unsigned long arg)
3341 {
3342         struct driver_data *dd = dev->bd_disk->private_data;
3343
3344         if (!capable(CAP_SYS_ADMIN))
3345                 return -EACCES;
3346
3347         if (!dd)
3348                 return -ENOTTY;
3349
3350         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3351                 return -ENOTTY;
3352
3353         switch (cmd) {
3354         case BLKFLSBUF:
3355                 return -ENOTTY;
3356         default:
3357                 return mtip_hw_ioctl(dd, cmd, arg);
3358         }
3359 }
3360
3361 #ifdef CONFIG_COMPAT
3362 /*
3363  * Block layer compat IOCTL handler.
3364  *
3365  * @dev Pointer to the block_device structure.
3366  * @mode ignored
3367  * @cmd IOCTL command passed from the user application.
3368  * @arg Argument passed from the user application.
3369  *
3370  * return value
3371  *      0        IOCTL completed successfully.
3372  *      -ENOTTY  IOCTL not supported or invalid driver data
3373  *                 structure pointer.
3374  */
3375 static int mtip_block_compat_ioctl(struct block_device *dev,
3376                             fmode_t mode,
3377                             unsigned cmd,
3378                             unsigned long arg)
3379 {
3380         struct driver_data *dd = dev->bd_disk->private_data;
3381
3382         if (!capable(CAP_SYS_ADMIN))
3383                 return -EACCES;
3384
3385         if (!dd)
3386                 return -ENOTTY;
3387
3388         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3389                 return -ENOTTY;
3390
3391         switch (cmd) {
3392         case BLKFLSBUF:
3393                 return -ENOTTY;
3394         case HDIO_DRIVE_TASKFILE: {
3395                 struct mtip_compat_ide_task_request_s __user *compat_req_task;
3396                 ide_task_request_t req_task;
3397                 int compat_tasksize, outtotal, ret;
3398
3399                 compat_tasksize =
3400                         sizeof(struct mtip_compat_ide_task_request_s);
3401
3402                 compat_req_task =
3403                         (struct mtip_compat_ide_task_request_s __user *) arg;
3404
3405                 if (copy_from_user(&req_task, (void __user *) arg,
3406                         compat_tasksize - (2 * sizeof(compat_long_t))))
3407                         return -EFAULT;
3408
3409                 if (get_user(req_task.out_size, &compat_req_task->out_size))
3410                         return -EFAULT;
3411
3412                 if (get_user(req_task.in_size, &compat_req_task->in_size))
3413                         return -EFAULT;
3414
3415                 outtotal = sizeof(struct mtip_compat_ide_task_request_s);
3416
3417                 ret = exec_drive_taskfile(dd, (void __user *) arg,
3418                                                 &req_task, outtotal);
3419
3420                 if (copy_to_user((void __user *) arg, &req_task,
3421                                 compat_tasksize -
3422                                 (2 * sizeof(compat_long_t))))
3423                         return -EFAULT;
3424
3425                 if (put_user(req_task.out_size, &compat_req_task->out_size))
3426                         return -EFAULT;
3427
3428                 if (put_user(req_task.in_size, &compat_req_task->in_size))
3429                         return -EFAULT;
3430
3431                 return ret;
3432         }
3433         default:
3434                 return mtip_hw_ioctl(dd, cmd, arg);
3435         }
3436 }
3437 #endif
3438
3439 /*
3440  * Obtain the geometry of the device.
3441  *
3442  * You may think that this function is obsolete, but some applications,
3443  * fdisk for example still used CHS values. This function describes the
3444  * device as having 224 heads and 56 sectors per cylinder. These values are
3445  * chosen so that each cylinder is aligned on a 4KB boundary. Since a
3446  * partition is described in terms of a start and end cylinder this means
3447  * that each partition is also 4KB aligned. Non-aligned partitions adversely
3448  * affects performance.
3449  *
3450  * @dev Pointer to the block_device strucutre.
3451  * @geo Pointer to a hd_geometry structure.
3452  *
3453  * return value
3454  *      0       Operation completed successfully.
3455  *      -ENOTTY An error occurred while reading the drive capacity.
3456  */
3457 static int mtip_block_getgeo(struct block_device *dev,
3458                                 struct hd_geometry *geo)
3459 {
3460         struct driver_data *dd = dev->bd_disk->private_data;
3461         sector_t capacity;
3462
3463         if (!dd)
3464                 return -ENOTTY;
3465
3466         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3467                 dev_warn(&dd->pdev->dev,
3468                         "Could not get drive capacity.\n");
3469                 return -ENOTTY;
3470         }
3471
3472         geo->heads = 224;
3473         geo->sectors = 56;
3474         sector_div(capacity, (geo->heads * geo->sectors));
3475         geo->cylinders = capacity;
3476         return 0;
3477 }
3478
3479 static int mtip_block_open(struct block_device *dev, fmode_t mode)
3480 {
3481         struct driver_data *dd;
3482
3483         if (dev && dev->bd_disk) {
3484                 dd = (struct driver_data *) dev->bd_disk->private_data;
3485
3486                 if (dd) {
3487                         if (test_bit(MTIP_DDF_REMOVAL_BIT,
3488                                                         &dd->dd_flag)) {
3489                                 return -ENODEV;
3490                         }
3491                         return 0;
3492                 }
3493         }
3494         return -ENODEV;
3495 }
3496
3497 static void mtip_block_release(struct gendisk *disk, fmode_t mode)
3498 {
3499 }
3500
3501 /*
3502  * Block device operation function.
3503  *
3504  * This structure contains pointers to the functions required by the block
3505  * layer.
3506  */
3507 static const struct block_device_operations mtip_block_ops = {
3508         .open           = mtip_block_open,
3509         .release        = mtip_block_release,
3510         .ioctl          = mtip_block_ioctl,
3511 #ifdef CONFIG_COMPAT
3512         .compat_ioctl   = mtip_block_compat_ioctl,
3513 #endif
3514         .getgeo         = mtip_block_getgeo,
3515         .owner          = THIS_MODULE
3516 };
3517
3518 static inline bool is_se_active(struct driver_data *dd)
3519 {
3520         if (unlikely(test_bit(MTIP_PF_SE_ACTIVE_BIT, &dd->port->flags))) {
3521                 if (dd->port->ic_pause_timer) {
3522                         unsigned long to = dd->port->ic_pause_timer +
3523                                                         msecs_to_jiffies(1000);
3524                         if (time_after(jiffies, to)) {
3525                                 clear_bit(MTIP_PF_SE_ACTIVE_BIT,
3526                                                         &dd->port->flags);
3527                                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag);
3528                                 dd->port->ic_pause_timer = 0;
3529                                 wake_up_interruptible(&dd->port->svc_wait);
3530                                 return false;
3531                         }
3532                 }
3533                 return true;
3534         }
3535         return false;
3536 }
3537
3538 /*
3539  * Block layer make request function.
3540  *
3541  * This function is called by the kernel to process a BIO for
3542  * the P320 device.
3543  *
3544  * @queue Pointer to the request queue. Unused other than to obtain
3545  *              the driver data structure.
3546  * @rq    Pointer to the request.
3547  *
3548  */
3549 static int mtip_submit_request(struct blk_mq_hw_ctx *hctx, struct request *rq)
3550 {
3551         struct driver_data *dd = hctx->queue->queuedata;
3552         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3553         unsigned int nents;
3554
3555         if (is_se_active(dd))
3556                 return -ENODATA;
3557
3558         if (unlikely(dd->dd_flag & MTIP_DDF_STOP_IO)) {
3559                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
3560                                                         &dd->dd_flag))) {
3561                         return -ENXIO;
3562                 }
3563                 if (unlikely(test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))) {
3564                         return -ENODATA;
3565                 }
3566                 if (unlikely(test_bit(MTIP_DDF_WRITE_PROTECT_BIT,
3567                                                         &dd->dd_flag) &&
3568                                 rq_data_dir(rq))) {
3569                         return -ENODATA;
3570                 }
3571                 if (unlikely(test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag) ||
3572                         test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag)))
3573                         return -ENODATA;
3574         }
3575
3576         if (req_op(rq) == REQ_OP_DISCARD) {
3577                 int err;
3578
3579                 err = mtip_send_trim(dd, blk_rq_pos(rq), blk_rq_sectors(rq));
3580                 blk_mq_end_request(rq, err ? BLK_STS_IOERR : BLK_STS_OK);
3581                 return 0;
3582         }
3583
3584         /* Create the scatter list for this request. */
3585         nents = blk_rq_map_sg(hctx->queue, rq, cmd->sg);
3586
3587         /* Issue the read/write. */
3588         mtip_hw_submit_io(dd, rq, cmd, nents, hctx);
3589         return 0;
3590 }
3591
3592 static bool mtip_check_unal_depth(struct blk_mq_hw_ctx *hctx,
3593                                   struct request *rq)
3594 {
3595         struct driver_data *dd = hctx->queue->queuedata;
3596         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3597
3598         if (rq_data_dir(rq) == READ || !dd->unal_qdepth)
3599                 return false;
3600
3601         /*
3602          * If unaligned depth must be limited on this controller, mark it
3603          * as unaligned if the IO isn't on a 4k boundary (start of length).
3604          */
3605         if (blk_rq_sectors(rq) <= 64) {
3606                 if ((blk_rq_pos(rq) & 7) || (blk_rq_sectors(rq) & 7))
3607                         cmd->unaligned = 1;
3608         }
3609
3610         if (cmd->unaligned && down_trylock(&dd->port->cmd_slot_unal))
3611                 return true;
3612
3613         return false;
3614 }
3615
3616 static blk_status_t mtip_issue_reserved_cmd(struct blk_mq_hw_ctx *hctx,
3617                 struct request *rq)
3618 {
3619         struct driver_data *dd = hctx->queue->queuedata;
3620         struct mtip_int_cmd *icmd = rq->special;
3621         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3622         struct mtip_cmd_sg *command_sg;
3623
3624         if (mtip_commands_active(dd->port))
3625                 return BLK_STS_RESOURCE;
3626
3627         /* Populate the SG list */
3628         cmd->command_header->opts =
3629                  __force_bit2int cpu_to_le32(icmd->opts | icmd->fis_len);
3630         if (icmd->buf_len) {
3631                 command_sg = cmd->command + AHCI_CMD_TBL_HDR_SZ;
3632
3633                 command_sg->info =
3634                         __force_bit2int cpu_to_le32((icmd->buf_len-1) & 0x3FFFFF);
3635                 command_sg->dba =
3636                         __force_bit2int cpu_to_le32(icmd->buffer & 0xFFFFFFFF);
3637                 command_sg->dba_upper =
3638                         __force_bit2int cpu_to_le32((icmd->buffer >> 16) >> 16);
3639
3640                 cmd->command_header->opts |=
3641                         __force_bit2int cpu_to_le32((1 << 16));
3642         }
3643
3644         /* Populate the command header */
3645         cmd->command_header->byte_count = 0;
3646
3647         blk_mq_start_request(rq);
3648         mtip_issue_non_ncq_command(dd->port, rq->tag);
3649         return 0;
3650 }
3651
3652 static blk_status_t mtip_queue_rq(struct blk_mq_hw_ctx *hctx,
3653                          const struct blk_mq_queue_data *bd)
3654 {
3655         struct request *rq = bd->rq;
3656         int ret;
3657
3658         mtip_init_cmd_header(rq);
3659
3660         if (blk_rq_is_passthrough(rq))
3661                 return mtip_issue_reserved_cmd(hctx, rq);
3662
3663         if (unlikely(mtip_check_unal_depth(hctx, rq)))
3664                 return BLK_STS_RESOURCE;
3665
3666         blk_mq_start_request(rq);
3667
3668         ret = mtip_submit_request(hctx, rq);
3669         if (likely(!ret))
3670                 return BLK_STS_OK;
3671         return BLK_STS_IOERR;
3672 }
3673
3674 static void mtip_free_cmd(struct blk_mq_tag_set *set, struct request *rq,
3675                           unsigned int hctx_idx)
3676 {
3677         struct driver_data *dd = set->driver_data;
3678         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3679
3680         if (!cmd->command)
3681                 return;
3682
3683         dmam_free_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
3684                                 cmd->command, cmd->command_dma);
3685 }
3686
3687 static int mtip_init_cmd(struct blk_mq_tag_set *set, struct request *rq,
3688                          unsigned int hctx_idx, unsigned int numa_node)
3689 {
3690         struct driver_data *dd = set->driver_data;
3691         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3692
3693         cmd->command = dmam_alloc_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
3694                         &cmd->command_dma, GFP_KERNEL);
3695         if (!cmd->command)
3696                 return -ENOMEM;
3697
3698         memset(cmd->command, 0, CMD_DMA_ALLOC_SZ);
3699
3700         sg_init_table(cmd->sg, MTIP_MAX_SG);
3701         return 0;
3702 }
3703
3704 static enum blk_eh_timer_return mtip_cmd_timeout(struct request *req,
3705                                                                 bool reserved)
3706 {
3707         struct driver_data *dd = req->q->queuedata;
3708
3709         if (reserved) {
3710                 struct mtip_cmd *cmd = blk_mq_rq_to_pdu(req);
3711
3712                 cmd->status = BLK_STS_TIMEOUT;
3713                 blk_mq_complete_request(req);
3714                 return BLK_EH_DONE;
3715         }
3716
3717         if (test_bit(req->tag, dd->port->cmds_to_issue))
3718                 goto exit_handler;
3719
3720         if (test_and_set_bit(MTIP_PF_TO_ACTIVE_BIT, &dd->port->flags))
3721                 goto exit_handler;
3722
3723         wake_up_interruptible(&dd->port->svc_wait);
3724 exit_handler:
3725         return BLK_EH_RESET_TIMER;
3726 }
3727
3728 static const struct blk_mq_ops mtip_mq_ops = {
3729         .queue_rq       = mtip_queue_rq,
3730         .init_request   = mtip_init_cmd,
3731         .exit_request   = mtip_free_cmd,
3732         .complete       = mtip_softirq_done_fn,
3733         .timeout        = mtip_cmd_timeout,
3734 };
3735
3736 /*
3737  * Block layer initialization function.
3738  *
3739  * This function is called once by the PCI layer for each P320
3740  * device that is connected to the system.
3741  *
3742  * @dd Pointer to the driver data structure.
3743  *
3744  * return value
3745  *      0 on success else an error code.
3746  */
3747 static int mtip_block_initialize(struct driver_data *dd)
3748 {
3749         int rv = 0, wait_for_rebuild = 0;
3750         sector_t capacity;
3751         unsigned int index = 0;
3752         struct kobject *kobj;
3753
3754         if (dd->disk)
3755                 goto skip_create_disk; /* hw init done, before rebuild */
3756
3757         if (mtip_hw_init(dd)) {
3758                 rv = -EINVAL;
3759                 goto protocol_init_error;
3760         }
3761
3762         dd->disk = alloc_disk_node(MTIP_MAX_MINORS, dd->numa_node);
3763         if (dd->disk  == NULL) {
3764                 dev_err(&dd->pdev->dev,
3765                         "Unable to allocate gendisk structure\n");
3766                 rv = -EINVAL;
3767                 goto alloc_disk_error;
3768         }
3769
3770         /* Generate the disk name, implemented same as in sd.c */
3771         do {
3772                 if (!ida_pre_get(&rssd_index_ida, GFP_KERNEL)) {
3773                         rv = -ENOMEM;
3774                         goto ida_get_error;
3775                 }
3776
3777                 spin_lock(&rssd_index_lock);
3778                 rv = ida_get_new(&rssd_index_ida, &index);
3779                 spin_unlock(&rssd_index_lock);
3780         } while (rv == -EAGAIN);
3781
3782         if (rv)
3783                 goto ida_get_error;
3784
3785         rv = rssd_disk_name_format("rssd",
3786                                 index,
3787                                 dd->disk->disk_name,
3788                                 DISK_NAME_LEN);
3789         if (rv)
3790                 goto disk_index_error;
3791
3792         dd->disk->major         = dd->major;
3793         dd->disk->first_minor   = index * MTIP_MAX_MINORS;
3794         dd->disk->minors        = MTIP_MAX_MINORS;
3795         dd->disk->fops          = &mtip_block_ops;
3796         dd->disk->private_data  = dd;
3797         dd->index               = index;
3798
3799         mtip_hw_debugfs_init(dd);
3800
3801         memset(&dd->tags, 0, sizeof(dd->tags));
3802         dd->tags.ops = &mtip_mq_ops;
3803         dd->tags.nr_hw_queues = 1;
3804         dd->tags.queue_depth = MTIP_MAX_COMMAND_SLOTS;
3805         dd->tags.reserved_tags = 1;
3806         dd->tags.cmd_size = sizeof(struct mtip_cmd);
3807         dd->tags.numa_node = dd->numa_node;
3808         dd->tags.flags = BLK_MQ_F_SHOULD_MERGE;
3809         dd->tags.driver_data = dd;
3810         dd->tags.timeout = MTIP_NCQ_CMD_TIMEOUT_MS;
3811
3812         rv = blk_mq_alloc_tag_set(&dd->tags);
3813         if (rv) {
3814                 dev_err(&dd->pdev->dev,
3815                         "Unable to allocate request queue\n");
3816                 goto block_queue_alloc_tag_error;
3817         }
3818
3819         /* Allocate the request queue. */
3820         dd->queue = blk_mq_init_queue(&dd->tags);
3821         if (IS_ERR(dd->queue)) {
3822                 dev_err(&dd->pdev->dev,
3823                         "Unable to allocate request queue\n");
3824                 rv = -ENOMEM;
3825                 goto block_queue_alloc_init_error;
3826         }
3827
3828         dd->disk->queue         = dd->queue;
3829         dd->queue->queuedata    = dd;
3830
3831 skip_create_disk:
3832         /* Initialize the protocol layer. */
3833         wait_for_rebuild = mtip_hw_get_identify(dd);
3834         if (wait_for_rebuild < 0) {
3835                 dev_err(&dd->pdev->dev,
3836                         "Protocol layer initialization failed\n");
3837                 rv = -EINVAL;
3838                 goto init_hw_cmds_error;
3839         }
3840
3841         /*
3842          * if rebuild pending, start the service thread, and delay the block
3843          * queue creation and device_add_disk()
3844          */
3845         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3846                 goto start_service_thread;
3847
3848         /* Set device limits. */
3849         blk_queue_flag_set(QUEUE_FLAG_NONROT, dd->queue);
3850         blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, dd->queue);
3851         blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
3852         blk_queue_physical_block_size(dd->queue, 4096);
3853         blk_queue_max_hw_sectors(dd->queue, 0xffff);
3854         blk_queue_max_segment_size(dd->queue, 0x400000);
3855         blk_queue_io_min(dd->queue, 4096);
3856
3857         /* Signal trim support */
3858         if (dd->trim_supp == true) {
3859                 blk_queue_flag_set(QUEUE_FLAG_DISCARD, dd->queue);
3860                 dd->queue->limits.discard_granularity = 4096;
3861                 blk_queue_max_discard_sectors(dd->queue,
3862                         MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES);
3863         }
3864
3865         /* Set the capacity of the device in 512 byte sectors. */
3866         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3867                 dev_warn(&dd->pdev->dev,
3868                         "Could not read drive capacity\n");
3869                 rv = -EIO;
3870                 goto read_capacity_error;
3871         }
3872         set_capacity(dd->disk, capacity);
3873
3874         /* Enable the block device and add it to /dev */
3875         device_add_disk(&dd->pdev->dev, dd->disk);
3876
3877         dd->bdev = bdget_disk(dd->disk, 0);
3878         /*
3879          * Now that the disk is active, initialize any sysfs attributes
3880          * managed by the protocol layer.
3881          */
3882         kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
3883         if (kobj) {
3884                 mtip_hw_sysfs_init(dd, kobj);
3885                 kobject_put(kobj);
3886         }
3887
3888         if (dd->mtip_svc_handler) {
3889                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
3890                 return rv; /* service thread created for handling rebuild */
3891         }
3892
3893 start_service_thread:
3894         dd->mtip_svc_handler = kthread_create_on_node(mtip_service_thread,
3895                                                 dd, dd->numa_node,
3896                                                 "mtip_svc_thd_%02d", index);
3897
3898         if (IS_ERR(dd->mtip_svc_handler)) {
3899                 dev_err(&dd->pdev->dev, "service thread failed to start\n");
3900                 dd->mtip_svc_handler = NULL;
3901                 rv = -EFAULT;
3902                 goto kthread_run_error;
3903         }
3904         wake_up_process(dd->mtip_svc_handler);
3905         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3906                 rv = wait_for_rebuild;
3907
3908         return rv;
3909
3910 kthread_run_error:
3911         bdput(dd->bdev);
3912         dd->bdev = NULL;
3913
3914         /* Delete our gendisk. This also removes the device from /dev */
3915         del_gendisk(dd->disk);
3916
3917 read_capacity_error:
3918 init_hw_cmds_error:
3919         blk_cleanup_queue(dd->queue);
3920 block_queue_alloc_init_error:
3921         blk_mq_free_tag_set(&dd->tags);
3922 block_queue_alloc_tag_error:
3923         mtip_hw_debugfs_exit(dd);
3924 disk_index_error:
3925         spin_lock(&rssd_index_lock);
3926         ida_remove(&rssd_index_ida, index);
3927         spin_unlock(&rssd_index_lock);
3928
3929 ida_get_error:
3930         put_disk(dd->disk);
3931
3932 alloc_disk_error:
3933         mtip_hw_exit(dd); /* De-initialize the protocol layer. */
3934
3935 protocol_init_error:
3936         return rv;
3937 }
3938
3939 static void mtip_no_dev_cleanup(struct request *rq, void *data, bool reserv)
3940 {
3941         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3942
3943         cmd->status = BLK_STS_IOERR;
3944         blk_mq_complete_request(rq);
3945 }
3946
3947 /*
3948  * Block layer deinitialization function.
3949  *
3950  * Called by the PCI layer as each P320 device is removed.
3951  *
3952  * @dd Pointer to the driver data structure.
3953  *
3954  * return value
3955  *      0
3956  */
3957 static int mtip_block_remove(struct driver_data *dd)
3958 {
3959         struct kobject *kobj;
3960
3961         mtip_hw_debugfs_exit(dd);
3962
3963         if (dd->mtip_svc_handler) {
3964                 set_bit(MTIP_PF_SVC_THD_STOP_BIT, &dd->port->flags);
3965                 wake_up_interruptible(&dd->port->svc_wait);
3966                 kthread_stop(dd->mtip_svc_handler);
3967         }
3968
3969         /* Clean up the sysfs attributes, if created */
3970         if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag)) {
3971                 kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
3972                 if (kobj) {
3973                         mtip_hw_sysfs_exit(dd, kobj);
3974                         kobject_put(kobj);
3975                 }
3976         }
3977
3978         if (!dd->sr) {
3979                 /*
3980                  * Explicitly wait here for IOs to quiesce,
3981                  * as mtip_standby_drive usually won't wait for IOs.
3982                  */
3983                 if (!mtip_quiesce_io(dd->port, MTIP_QUIESCE_IO_TIMEOUT_MS))
3984                         mtip_standby_drive(dd);
3985         }
3986         else
3987                 dev_info(&dd->pdev->dev, "device %s surprise removal\n",
3988                                                 dd->disk->disk_name);
3989
3990         blk_freeze_queue_start(dd->queue);
3991         blk_mq_quiesce_queue(dd->queue);
3992         blk_mq_tagset_busy_iter(&dd->tags, mtip_no_dev_cleanup, dd);
3993         blk_mq_unquiesce_queue(dd->queue);
3994
3995         /*
3996          * Delete our gendisk structure. This also removes the device
3997          * from /dev
3998          */
3999         if (dd->bdev) {
4000                 bdput(dd->bdev);
4001                 dd->bdev = NULL;
4002         }
4003         if (dd->disk) {
4004                 if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
4005                         del_gendisk(dd->disk);
4006                 if (dd->disk->queue) {
4007                         blk_cleanup_queue(dd->queue);
4008                         blk_mq_free_tag_set(&dd->tags);
4009                         dd->queue = NULL;
4010                 }
4011                 put_disk(dd->disk);
4012         }
4013         dd->disk  = NULL;
4014
4015         spin_lock(&rssd_index_lock);
4016         ida_remove(&rssd_index_ida, dd->index);
4017         spin_unlock(&rssd_index_lock);
4018
4019         /* De-initialize the protocol layer. */
4020         mtip_hw_exit(dd);
4021
4022         return 0;
4023 }
4024
4025 /*
4026  * Function called by the PCI layer when just before the
4027  * machine shuts down.
4028  *
4029  * If a protocol layer shutdown function is present it will be called
4030  * by this function.
4031  *
4032  * @dd Pointer to the driver data structure.
4033  *
4034  * return value
4035  *      0
4036  */
4037 static int mtip_block_shutdown(struct driver_data *dd)
4038 {
4039         mtip_hw_shutdown(dd);
4040
4041         /* Delete our gendisk structure, and cleanup the blk queue. */
4042         if (dd->disk) {
4043                 dev_info(&dd->pdev->dev,
4044                         "Shutting down %s ...\n", dd->disk->disk_name);
4045
4046                 if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag))
4047                         del_gendisk(dd->disk);
4048                 if (dd->disk->queue) {
4049                         blk_cleanup_queue(dd->queue);
4050                         blk_mq_free_tag_set(&dd->tags);
4051                 }
4052                 put_disk(dd->disk);
4053                 dd->disk  = NULL;
4054                 dd->queue = NULL;
4055         }
4056
4057         spin_lock(&rssd_index_lock);
4058         ida_remove(&rssd_index_ida, dd->index);
4059         spin_unlock(&rssd_index_lock);
4060         return 0;
4061 }
4062
4063 static int mtip_block_suspend(struct driver_data *dd)
4064 {
4065         dev_info(&dd->pdev->dev,
4066                 "Suspending %s ...\n", dd->disk->disk_name);
4067         mtip_hw_suspend(dd);
4068         return 0;
4069 }
4070
4071 static int mtip_block_resume(struct driver_data *dd)
4072 {
4073         dev_info(&dd->pdev->dev, "Resuming %s ...\n",
4074                 dd->disk->disk_name);
4075         mtip_hw_resume(dd);
4076         return 0;
4077 }
4078
4079 static void drop_cpu(int cpu)
4080 {
4081         cpu_use[cpu]--;
4082 }
4083
4084 static int get_least_used_cpu_on_node(int node)
4085 {
4086         int cpu, least_used_cpu, least_cnt;
4087         const struct cpumask *node_mask;
4088
4089         node_mask = cpumask_of_node(node);
4090         least_used_cpu = cpumask_first(node_mask);
4091         least_cnt = cpu_use[least_used_cpu];
4092         cpu = least_used_cpu;
4093
4094         for_each_cpu(cpu, node_mask) {
4095                 if (cpu_use[cpu] < least_cnt) {
4096                         least_used_cpu = cpu;
4097                         least_cnt = cpu_use[cpu];
4098                 }
4099         }
4100         cpu_use[least_used_cpu]++;
4101         return least_used_cpu;
4102 }
4103
4104 /* Helper for selecting a node in round robin mode */
4105 static inline int mtip_get_next_rr_node(void)
4106 {
4107         static int next_node = -1;
4108
4109         if (next_node == -1) {
4110                 next_node = first_online_node;
4111                 return next_node;
4112         }
4113
4114         next_node = next_online_node(next_node);
4115         if (next_node == MAX_NUMNODES)
4116                 next_node = first_online_node;
4117         return next_node;
4118 }
4119
4120 static DEFINE_HANDLER(0);
4121 static DEFINE_HANDLER(1);
4122 static DEFINE_HANDLER(2);
4123 static DEFINE_HANDLER(3);
4124 static DEFINE_HANDLER(4);
4125 static DEFINE_HANDLER(5);
4126 static DEFINE_HANDLER(6);
4127 static DEFINE_HANDLER(7);
4128
4129 static void mtip_disable_link_opts(struct driver_data *dd, struct pci_dev *pdev)
4130 {
4131         int pos;
4132         unsigned short pcie_dev_ctrl;
4133
4134         pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
4135         if (pos) {
4136                 pci_read_config_word(pdev,
4137                         pos + PCI_EXP_DEVCTL,
4138                         &pcie_dev_ctrl);
4139                 if (pcie_dev_ctrl & (1 << 11) ||
4140                     pcie_dev_ctrl & (1 << 4)) {
4141                         dev_info(&dd->pdev->dev,
4142                                 "Disabling ERO/No-Snoop on bridge device %04x:%04x\n",
4143                                         pdev->vendor, pdev->device);
4144                         pcie_dev_ctrl &= ~(PCI_EXP_DEVCTL_NOSNOOP_EN |
4145                                                 PCI_EXP_DEVCTL_RELAX_EN);
4146                         pci_write_config_word(pdev,
4147                                 pos + PCI_EXP_DEVCTL,
4148                                 pcie_dev_ctrl);
4149                 }
4150         }
4151 }
4152
4153 static void mtip_fix_ero_nosnoop(struct driver_data *dd, struct pci_dev *pdev)
4154 {
4155         /*
4156          * This workaround is specific to AMD/ATI chipset with a PCI upstream
4157          * device with device id 0x5aXX
4158          */
4159         if (pdev->bus && pdev->bus->self) {
4160                 if (pdev->bus->self->vendor == PCI_VENDOR_ID_ATI &&
4161                     ((pdev->bus->self->device & 0xff00) == 0x5a00)) {
4162                         mtip_disable_link_opts(dd, pdev->bus->self);
4163                 } else {
4164                         /* Check further up the topology */
4165                         struct pci_dev *parent_dev = pdev->bus->self;
4166                         if (parent_dev->bus &&
4167                                 parent_dev->bus->parent &&
4168                                 parent_dev->bus->parent->self &&
4169                                 parent_dev->bus->parent->self->vendor ==
4170                                          PCI_VENDOR_ID_ATI &&
4171                                 (parent_dev->bus->parent->self->device &
4172                                         0xff00) == 0x5a00) {
4173                                 mtip_disable_link_opts(dd,
4174                                         parent_dev->bus->parent->self);
4175                         }
4176                 }
4177         }
4178 }
4179
4180 /*
4181  * Called for each supported PCI device detected.
4182  *
4183  * This function allocates the private data structure, enables the
4184  * PCI device and then calls the block layer initialization function.
4185  *
4186  * return value
4187  *      0 on success else an error code.
4188  */
4189 static int mtip_pci_probe(struct pci_dev *pdev,
4190                         const struct pci_device_id *ent)
4191 {
4192         int rv = 0;
4193         struct driver_data *dd = NULL;
4194         char cpu_list[256];
4195         const struct cpumask *node_mask;
4196         int cpu, i = 0, j = 0;
4197         int my_node = NUMA_NO_NODE;
4198         unsigned long flags;
4199
4200         /* Allocate memory for this devices private data. */
4201         my_node = pcibus_to_node(pdev->bus);
4202         if (my_node != NUMA_NO_NODE) {
4203                 if (!node_online(my_node))
4204                         my_node = mtip_get_next_rr_node();
4205         } else {
4206                 dev_info(&pdev->dev, "Kernel not reporting proximity, choosing a node\n");
4207                 my_node = mtip_get_next_rr_node();
4208         }
4209         dev_info(&pdev->dev, "NUMA node %d (closest: %d,%d, probe on %d:%d)\n",
4210                 my_node, pcibus_to_node(pdev->bus), dev_to_node(&pdev->dev),
4211                 cpu_to_node(raw_smp_processor_id()), raw_smp_processor_id());
4212
4213         dd = kzalloc_node(sizeof(struct driver_data), GFP_KERNEL, my_node);
4214         if (dd == NULL) {
4215                 dev_err(&pdev->dev,
4216                         "Unable to allocate memory for driver data\n");
4217                 return -ENOMEM;
4218         }
4219
4220         /* Attach the private data to this PCI device.  */
4221         pci_set_drvdata(pdev, dd);
4222
4223         rv = pcim_enable_device(pdev);
4224         if (rv < 0) {
4225                 dev_err(&pdev->dev, "Unable to enable device\n");
4226                 goto iomap_err;
4227         }
4228
4229         /* Map BAR5 to memory. */
4230         rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME);
4231         if (rv < 0) {
4232                 dev_err(&pdev->dev, "Unable to map regions\n");
4233                 goto iomap_err;
4234         }
4235
4236         if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
4237                 rv = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
4238
4239                 if (rv) {
4240                         rv = pci_set_consistent_dma_mask(pdev,
4241                                                 DMA_BIT_MASK(32));
4242                         if (rv) {
4243                                 dev_warn(&pdev->dev,
4244                                         "64-bit DMA enable failed\n");
4245                                 goto setmask_err;
4246                         }
4247                 }
4248         }
4249
4250         /* Copy the info we may need later into the private data structure. */
4251         dd->major       = mtip_major;
4252         dd->instance    = instance;
4253         dd->pdev        = pdev;
4254         dd->numa_node   = my_node;
4255
4256         INIT_LIST_HEAD(&dd->online_list);
4257         INIT_LIST_HEAD(&dd->remove_list);
4258
4259         memset(dd->workq_name, 0, 32);
4260         snprintf(dd->workq_name, 31, "mtipq%d", dd->instance);
4261
4262         dd->isr_workq = create_workqueue(dd->workq_name);
4263         if (!dd->isr_workq) {
4264                 dev_warn(&pdev->dev, "Can't create wq %d\n", dd->instance);
4265                 rv = -ENOMEM;
4266                 goto setmask_err;
4267         }
4268
4269         memset(cpu_list, 0, sizeof(cpu_list));
4270
4271         node_mask = cpumask_of_node(dd->numa_node);
4272         if (!cpumask_empty(node_mask)) {
4273                 for_each_cpu(cpu, node_mask)
4274                 {
4275                         snprintf(&cpu_list[j], 256 - j, "%d ", cpu);
4276                         j = strlen(cpu_list);
4277                 }
4278
4279                 dev_info(&pdev->dev, "Node %d on package %d has %d cpu(s): %s\n",
4280                         dd->numa_node,
4281                         topology_physical_package_id(cpumask_first(node_mask)),
4282                         nr_cpus_node(dd->numa_node),
4283                         cpu_list);
4284         } else
4285                 dev_dbg(&pdev->dev, "mtip32xx: node_mask empty\n");
4286
4287         dd->isr_binding = get_least_used_cpu_on_node(dd->numa_node);
4288         dev_info(&pdev->dev, "Initial IRQ binding node:cpu %d:%d\n",
4289                 cpu_to_node(dd->isr_binding), dd->isr_binding);
4290
4291         /* first worker context always runs in ISR */
4292         dd->work[0].cpu_binding = dd->isr_binding;
4293         dd->work[1].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4294         dd->work[2].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4295         dd->work[3].cpu_binding = dd->work[0].cpu_binding;
4296         dd->work[4].cpu_binding = dd->work[1].cpu_binding;
4297         dd->work[5].cpu_binding = dd->work[2].cpu_binding;
4298         dd->work[6].cpu_binding = dd->work[2].cpu_binding;
4299         dd->work[7].cpu_binding = dd->work[1].cpu_binding;
4300
4301         /* Log the bindings */
4302         for_each_present_cpu(cpu) {
4303                 memset(cpu_list, 0, sizeof(cpu_list));
4304                 for (i = 0, j = 0; i < MTIP_MAX_SLOT_GROUPS; i++) {
4305                         if (dd->work[i].cpu_binding == cpu) {
4306                                 snprintf(&cpu_list[j], 256 - j, "%d ", i);
4307                                 j = strlen(cpu_list);
4308                         }
4309                 }
4310                 if (j)
4311                         dev_info(&pdev->dev, "CPU %d: WQs %s\n", cpu, cpu_list);
4312         }
4313
4314         INIT_WORK(&dd->work[0].work, mtip_workq_sdbf0);
4315         INIT_WORK(&dd->work[1].work, mtip_workq_sdbf1);
4316         INIT_WORK(&dd->work[2].work, mtip_workq_sdbf2);
4317         INIT_WORK(&dd->work[3].work, mtip_workq_sdbf3);
4318         INIT_WORK(&dd->work[4].work, mtip_workq_sdbf4);
4319         INIT_WORK(&dd->work[5].work, mtip_workq_sdbf5);
4320         INIT_WORK(&dd->work[6].work, mtip_workq_sdbf6);
4321         INIT_WORK(&dd->work[7].work, mtip_workq_sdbf7);
4322
4323         pci_set_master(pdev);
4324         rv = pci_enable_msi(pdev);
4325         if (rv) {
4326                 dev_warn(&pdev->dev,
4327                         "Unable to enable MSI interrupt.\n");
4328                 goto msi_initialize_err;
4329         }
4330
4331         mtip_fix_ero_nosnoop(dd, pdev);
4332
4333         /* Initialize the block layer. */
4334         rv = mtip_block_initialize(dd);
4335         if (rv < 0) {
4336                 dev_err(&pdev->dev,
4337                         "Unable to initialize block layer\n");
4338                 goto block_initialize_err;
4339         }
4340
4341         /*
4342          * Increment the instance count so that each device has a unique
4343          * instance number.
4344          */
4345         instance++;
4346         if (rv != MTIP_FTL_REBUILD_MAGIC)
4347                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4348         else
4349                 rv = 0; /* device in rebuild state, return 0 from probe */
4350
4351         /* Add to online list even if in ftl rebuild */
4352         spin_lock_irqsave(&dev_lock, flags);
4353         list_add(&dd->online_list, &online_list);
4354         spin_unlock_irqrestore(&dev_lock, flags);
4355
4356         goto done;
4357
4358 block_initialize_err:
4359         pci_disable_msi(pdev);
4360
4361 msi_initialize_err:
4362         if (dd->isr_workq) {
4363                 flush_workqueue(dd->isr_workq);
4364                 destroy_workqueue(dd->isr_workq);
4365                 drop_cpu(dd->work[0].cpu_binding);
4366                 drop_cpu(dd->work[1].cpu_binding);
4367                 drop_cpu(dd->work[2].cpu_binding);
4368         }
4369 setmask_err:
4370         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4371
4372 iomap_err:
4373         kfree(dd);
4374         pci_set_drvdata(pdev, NULL);
4375         return rv;
4376 done:
4377         return rv;
4378 }
4379
4380 /*
4381  * Called for each probed device when the device is removed or the
4382  * driver is unloaded.
4383  *
4384  * return value
4385  *      None
4386  */
4387 static void mtip_pci_remove(struct pci_dev *pdev)
4388 {
4389         struct driver_data *dd = pci_get_drvdata(pdev);
4390         unsigned long flags, to;
4391
4392         set_bit(MTIP_DDF_REMOVAL_BIT, &dd->dd_flag);
4393
4394         spin_lock_irqsave(&dev_lock, flags);
4395         list_del_init(&dd->online_list);
4396         list_add(&dd->remove_list, &removing_list);
4397         spin_unlock_irqrestore(&dev_lock, flags);
4398
4399         mtip_check_surprise_removal(pdev);
4400         synchronize_irq(dd->pdev->irq);
4401
4402         /* Spin until workers are done */
4403         to = jiffies + msecs_to_jiffies(4000);
4404         do {
4405                 msleep(20);
4406         } while (atomic_read(&dd->irq_workers_active) != 0 &&
4407                 time_before(jiffies, to));
4408
4409         if (!dd->sr)
4410                 fsync_bdev(dd->bdev);
4411
4412         if (atomic_read(&dd->irq_workers_active) != 0) {
4413                 dev_warn(&dd->pdev->dev,
4414                         "Completion workers still active!\n");
4415         }
4416
4417         blk_set_queue_dying(dd->queue);
4418         set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
4419
4420         /* Clean up the block layer. */
4421         mtip_block_remove(dd);
4422
4423         if (dd->isr_workq) {
4424                 flush_workqueue(dd->isr_workq);
4425                 destroy_workqueue(dd->isr_workq);
4426                 drop_cpu(dd->work[0].cpu_binding);
4427                 drop_cpu(dd->work[1].cpu_binding);
4428                 drop_cpu(dd->work[2].cpu_binding);
4429         }
4430
4431         pci_disable_msi(pdev);
4432
4433         spin_lock_irqsave(&dev_lock, flags);
4434         list_del_init(&dd->remove_list);
4435         spin_unlock_irqrestore(&dev_lock, flags);
4436
4437         kfree(dd);
4438
4439         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4440         pci_set_drvdata(pdev, NULL);
4441 }
4442
4443 /*
4444  * Called for each probed device when the device is suspended.
4445  *
4446  * return value
4447  *      0  Success
4448  *      <0 Error
4449  */
4450 static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
4451 {
4452         int rv = 0;
4453         struct driver_data *dd = pci_get_drvdata(pdev);
4454
4455         if (!dd) {
4456                 dev_err(&pdev->dev,
4457                         "Driver private datastructure is NULL\n");
4458                 return -EFAULT;
4459         }
4460
4461         set_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4462
4463         /* Disable ports & interrupts then send standby immediate */
4464         rv = mtip_block_suspend(dd);
4465         if (rv < 0) {
4466                 dev_err(&pdev->dev,
4467                         "Failed to suspend controller\n");
4468                 return rv;
4469         }
4470
4471         /*
4472          * Save the pci config space to pdev structure &
4473          * disable the device
4474          */
4475         pci_save_state(pdev);
4476         pci_disable_device(pdev);
4477
4478         /* Move to Low power state*/
4479         pci_set_power_state(pdev, PCI_D3hot);
4480
4481         return rv;
4482 }
4483
4484 /*
4485  * Called for each probed device when the device is resumed.
4486  *
4487  * return value
4488  *      0  Success
4489  *      <0 Error
4490  */
4491 static int mtip_pci_resume(struct pci_dev *pdev)
4492 {
4493         int rv = 0;
4494         struct driver_data *dd;
4495
4496         dd = pci_get_drvdata(pdev);
4497         if (!dd) {
4498                 dev_err(&pdev->dev,
4499                         "Driver private datastructure is NULL\n");
4500                 return -EFAULT;
4501         }
4502
4503         /* Move the device to active State */
4504         pci_set_power_state(pdev, PCI_D0);
4505
4506         /* Restore PCI configuration space */
4507         pci_restore_state(pdev);
4508
4509         /* Enable the PCI device*/
4510         rv = pcim_enable_device(pdev);
4511         if (rv < 0) {
4512                 dev_err(&pdev->dev,
4513                         "Failed to enable card during resume\n");
4514                 goto err;
4515         }
4516         pci_set_master(pdev);
4517
4518         /*
4519          * Calls hbaReset, initPort, & startPort function
4520          * then enables interrupts
4521          */
4522         rv = mtip_block_resume(dd);
4523         if (rv < 0)
4524                 dev_err(&pdev->dev, "Unable to resume\n");
4525
4526 err:
4527         clear_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4528
4529         return rv;
4530 }
4531
4532 /*
4533  * Shutdown routine
4534  *
4535  * return value
4536  *      None
4537  */
4538 static void mtip_pci_shutdown(struct pci_dev *pdev)
4539 {
4540         struct driver_data *dd = pci_get_drvdata(pdev);
4541         if (dd)
4542                 mtip_block_shutdown(dd);
4543 }
4544
4545 /* Table of device ids supported by this driver. */
4546 static const struct pci_device_id mtip_pci_tbl[] = {
4547         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320H_DEVICE_ID) },
4548         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320M_DEVICE_ID) },
4549         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320S_DEVICE_ID) },
4550         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P325M_DEVICE_ID) },
4551         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420H_DEVICE_ID) },
4552         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420M_DEVICE_ID) },
4553         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P425M_DEVICE_ID) },
4554         { 0 }
4555 };
4556
4557 /* Structure that describes the PCI driver functions. */
4558 static struct pci_driver mtip_pci_driver = {
4559         .name                   = MTIP_DRV_NAME,
4560         .id_table               = mtip_pci_tbl,
4561         .probe                  = mtip_pci_probe,
4562         .remove                 = mtip_pci_remove,
4563         .suspend                = mtip_pci_suspend,
4564         .resume                 = mtip_pci_resume,
4565         .shutdown               = mtip_pci_shutdown,
4566 };
4567
4568 MODULE_DEVICE_TABLE(pci, mtip_pci_tbl);
4569
4570 /*
4571  * Module initialization function.
4572  *
4573  * Called once when the module is loaded. This function allocates a major
4574  * block device number to the Cyclone devices and registers the PCI layer
4575  * of the driver.
4576  *
4577  * Return value
4578  *      0 on success else error code.
4579  */
4580 static int __init mtip_init(void)
4581 {
4582         int error;
4583
4584         pr_info(MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n");
4585
4586         spin_lock_init(&dev_lock);
4587
4588         INIT_LIST_HEAD(&online_list);
4589         INIT_LIST_HEAD(&removing_list);
4590
4591         /* Allocate a major block device number to use with this driver. */
4592         error = register_blkdev(0, MTIP_DRV_NAME);
4593         if (error <= 0) {
4594                 pr_err("Unable to register block device (%d)\n",
4595                 error);
4596                 return -EBUSY;
4597         }
4598         mtip_major = error;
4599
4600         dfs_parent = debugfs_create_dir("rssd", NULL);
4601         if (IS_ERR_OR_NULL(dfs_parent)) {
4602                 pr_warn("Error creating debugfs parent\n");
4603                 dfs_parent = NULL;
4604         }
4605         if (dfs_parent) {
4606                 dfs_device_status = debugfs_create_file("device_status",
4607                                         0444, dfs_parent, NULL,
4608                                         &mtip_device_status_fops);
4609                 if (IS_ERR_OR_NULL(dfs_device_status)) {
4610                         pr_err("Error creating device_status node\n");
4611                         dfs_device_status = NULL;
4612                 }
4613         }
4614
4615         /* Register our PCI operations. */
4616         error = pci_register_driver(&mtip_pci_driver);
4617         if (error) {
4618                 debugfs_remove(dfs_parent);
4619                 unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4620         }
4621
4622         return error;
4623 }
4624
4625 /*
4626  * Module de-initialization function.
4627  *
4628  * Called once when the module is unloaded. This function deallocates
4629  * the major block device number allocated by mtip_init() and
4630  * unregisters the PCI layer of the driver.
4631  *
4632  * Return value
4633  *      none
4634  */
4635 static void __exit mtip_exit(void)
4636 {
4637         /* Release the allocated major block device number. */
4638         unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4639
4640         /* Unregister the PCI driver. */
4641         pci_unregister_driver(&mtip_pci_driver);
4642
4643         debugfs_remove_recursive(dfs_parent);
4644 }
4645
4646 MODULE_AUTHOR("Micron Technology, Inc");
4647 MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
4648 MODULE_LICENSE("GPL");
4649 MODULE_VERSION(MTIP_DRV_VERSION);
4650
4651 module_init(mtip_init);
4652 module_exit(mtip_exit);