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