drivers/block/mtip32xx/mtip32xx.c

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