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/bio.h>
  35 #include <linux/dma-mapping.h>
  36 #include <linux/idr.h>
  37 #include <linux/kthread.h>
  38 #include <../drivers/ata/ahci.h>
  39 #include <linux/export.h>
  40 #include <linux/debugfs.h>
  41 #include "mtip32xx.h"
  42
  43 #define HW_CMD_SLOT_SZ          (MTIP_MAX_COMMAND_SLOTS * 32)
  44 #define HW_CMD_TBL_SZ           (AHCI_CMD_TBL_HDR_SZ + (MTIP_MAX_SG * 16))
  45 #define HW_CMD_TBL_AR_SZ        (HW_CMD_TBL_SZ * MTIP_MAX_COMMAND_SLOTS)
  46 #define HW_PORT_PRIV_DMA_SZ \
  47                 (HW_CMD_SLOT_SZ + HW_CMD_TBL_AR_SZ + AHCI_RX_FIS_SZ)
  48
  49 #define HOST_CAP_NZDMA          (1 << 19)
  50 #define HOST_HSORG              0xFC
  51 #define HSORG_DISABLE_SLOTGRP_INTR (1<<24)
  52 #define HSORG_DISABLE_SLOTGRP_PXIS (1<<16)
  53 #define HSORG_HWREV             0xFF00
  54 #define HSORG_STYLE             0x8
  55 #define HSORG_SLOTGROUPS        0x7
  56
  57 #define PORT_COMMAND_ISSUE      0x38
  58 #define PORT_SDBV               0x7C
  59
  60 #define PORT_OFFSET             0x100
  61 #define PORT_MEM_SIZE           0x80
  62
  63 #define PORT_IRQ_ERR \
  64         (PORT_IRQ_HBUS_ERR | PORT_IRQ_IF_ERR | PORT_IRQ_CONNECT | \
  65          PORT_IRQ_PHYRDY | PORT_IRQ_UNK_FIS | PORT_IRQ_BAD_PMP | \
  66          PORT_IRQ_TF_ERR | PORT_IRQ_HBUS_DATA_ERR | PORT_IRQ_IF_NONFATAL | \
  67          PORT_IRQ_OVERFLOW)
  68 #define PORT_IRQ_LEGACY \
  69         (PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS)
  70 #define PORT_IRQ_HANDLED \
  71         (PORT_IRQ_SDB_FIS | PORT_IRQ_LEGACY | \
  72          PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR | \
  73          PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)
  74 #define DEF_PORT_IRQ \
  75         (PORT_IRQ_ERR | PORT_IRQ_LEGACY | PORT_IRQ_SDB_FIS)
  76
  77 /* product numbers */
  78 #define MTIP_PRODUCT_UNKNOWN    0x00
  79 #define MTIP_PRODUCT_ASICFPGA   0x11
  80
  81 /* Device instance number, incremented each time a device is probed. */
  82 static int instance;
  83
  84 /*
  85  * Global variable used to hold the major block device number
  86  * allocated in mtip_init().
  87  */
  88 static int mtip_major;
  89 static struct dentry *dfs_parent;
  90
  91 static DEFINE_SPINLOCK(rssd_index_lock);
  92 static DEFINE_IDA(rssd_index_ida);
  93
  94 static int mtip_block_initialize(struct driver_data *dd);
  95
  96 #ifdef CONFIG_COMPAT
  97 struct mtip_compat_ide_task_request_s {
  98         __u8            io_ports[8];
  99         __u8            hob_ports[8];
 100         ide_reg_valid_t out_flags;
 101         ide_reg_valid_t in_flags;
 102         int             data_phase;
 103         int             req_cmd;
 104         compat_ulong_t  out_size;
 105         compat_ulong_t  in_size;
 106 };
 107 #endif
 108
 109 /*
 110  * This function check_for_surprise_removal is called
 111  * while card is removed from the system and it will
 112  * read the vendor id from the configration space
 113  *
 114  * @pdev Pointer to the pci_dev structure.
 115  *
 116  * return value
 117  *       true if device removed, else false
 118  */
 119 static bool mtip_check_surprise_removal(struct pci_dev *pdev)
 120 {
 121         u16 vendor_id = 0;
 122
 123        /* Read the vendorID from the configuration space */
 124         pci_read_config_word(pdev, 0x00, &vendor_id);
 125         if (vendor_id == 0xFFFF)
 126                 return true; /* device removed */
 127
 128         return false; /* device present */
 129 }
 130
 131 /*
 132  * This function is called for clean the pending command in the
 133  * command slot during the surprise removal of device and return
 134  * error to the upper layer.
 135  *
 136  * @dd Pointer to the DRIVER_DATA structure.
 137  *
 138  * return value
 139  *      None
 140  */
 141 static void mtip_command_cleanup(struct driver_data *dd)
 142 {
 143         int group = 0, commandslot = 0, commandindex = 0;
 144         struct mtip_cmd *command;
 145         struct mtip_port *port = dd->port;
 146         static int in_progress;
 147
 148         if (in_progress)
 149                 return;
 150
 151         in_progress = 1;
 152
 153         for (group = 0; group < 4; group++) {
 154                 for (commandslot = 0; commandslot < 32; commandslot++) {
 155                         if (!(port->allocated[group] & (1 << commandslot)))
 156                                 continue;
 157
 158                         commandindex = group << 5 | commandslot;
 159                         command = &port->commands[commandindex];
 160
 161                         if (atomic_read(&command->active)
 162                             && (command->async_callback)) {
 163                                 command->async_callback(command->async_data,
 164                                         -ENODEV);
 165                                 command->async_callback = NULL;
 166                                 command->async_data = NULL;
 167                         }
 168
 169                         dma_unmap_sg(&port->dd->pdev->dev,
 170                                 command->sg,
 171                                 command->scatter_ents,
 172                                 command->direction);
 173                 }
 174         }
 175
 176         up(&port->cmd_slot);
 177
 178         set_bit(MTIP_DDF_CLEANUP_BIT, &dd->dd_flag);
 179         in_progress = 0;
 180 }
 181
 182 /*
 183  * Obtain an empty command slot.
 184  *
 185  * This function needs to be reentrant since it could be called
 186  * at the same time on multiple CPUs. The allocation of the
 187  * command slot must be atomic.
 188  *
 189  * @port Pointer to the port data structure.
 190  *
 191  * return value
 192  *      >= 0    Index of command slot obtained.
 193  *      -1      No command slots available.
 194  */
 195 static int get_slot(struct mtip_port *port)
 196 {
 197         int slot, i;
 198         unsigned int num_command_slots = port->dd->slot_groups * 32;
 199
 200         /*
 201          * Try 10 times, because there is a small race here.
 202          *  that's ok, because it's still cheaper than a lock.
 203          *
 204          * Race: Since this section is not protected by lock, same bit
 205          * could be chosen by different process contexts running in
 206          * different processor. So instead of costly lock, we are going
 207          * with loop.
 208          */
 209         for (i = 0; i < 10; i++) {
 210                 slot = find_next_zero_bit(port->allocated,
 211                                          num_command_slots, 1);
 212                 if ((slot < num_command_slots) &&
 213                     (!test_and_set_bit(slot, port->allocated)))
 214                         return slot;
 215         }
 216         dev_warn(&port->dd->pdev->dev, "Failed to get a tag.\n");
 217
 218         if (mtip_check_surprise_removal(port->dd->pdev)) {
 219                 /* Device not present, clean outstanding commands */
 220                 mtip_command_cleanup(port->dd);
 221         }
 222         return -1;
 223 }
 224
 225 /*
 226  * Release a command slot.
 227  *
 228  * @port Pointer to the port data structure.
 229  * @tag  Tag of command to release
 230  *
 231  * return value
 232  *      None
 233  */
 234 static inline void release_slot(struct mtip_port *port, int tag)
 235 {
 236         smp_mb__before_clear_bit();
 237         clear_bit(tag, port->allocated);
 238         smp_mb__after_clear_bit();
 239 }
 240
 241 /*
 242  * Reset the HBA (without sleeping)
 243  *
 244  * Just like hba_reset, except does not call sleep, so can be
 245  * run from interrupt/tasklet context.
 246  *
 247  * @dd Pointer to the driver data structure.
 248  *
 249  * return value
 250  *      0       The reset was successful.
 251  *      -1      The HBA Reset bit did not clear.
 252  */
 253 static int hba_reset_nosleep(struct driver_data *dd)
 254 {
 255         unsigned long timeout;
 256
 257         /* Chip quirk: quiesce any chip function */
 258         mdelay(10);
 259
 260         /* Set the reset bit */
 261         writel(HOST_RESET, dd->mmio + HOST_CTL);
 262
 263         /* Flush */
 264         readl(dd->mmio + HOST_CTL);
 265
 266         /*
 267          * Wait 10ms then spin for up to 1 second
 268          * waiting for reset acknowledgement
 269          */
 270         timeout = jiffies + msecs_to_jiffies(1000);
 271         mdelay(10);
 272         while ((readl(dd->mmio + HOST_CTL) & HOST_RESET)
 273                  && time_before(jiffies, timeout))
 274                 mdelay(1);
 275
 276         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))
 277                 return -1;
 278
 279         if (readl(dd->mmio + HOST_CTL) & HOST_RESET)
 280                 return -1;
 281
 282         return 0;
 283 }
 284
 285 /*
 286  * Issue a command to the hardware.
 287  *
 288  * Set the appropriate bit in the s_active and Command Issue hardware
 289  * registers, causing hardware command processing to begin.
 290  *
 291  * @port Pointer to the port structure.
 292  * @tag  The tag of the command to be issued.
 293  *
 294  * return value
 295  *      None
 296  */
 297 static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag)
 298 {
 299         atomic_set(&port->commands[tag].active, 1);
 300
 301         spin_lock(&port->cmd_issue_lock);
 302
 303         writel((1 << MTIP_TAG_BIT(tag)),
 304                         port->s_active[MTIP_TAG_INDEX(tag)]);
 305         writel((1 << MTIP_TAG_BIT(tag)),
 306                         port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 307
 308         spin_unlock(&port->cmd_issue_lock);
 309
 310         /* Set the command's timeout value.*/
 311         port->commands[tag].comp_time = jiffies + msecs_to_jiffies(
 312                                         MTIP_NCQ_COMMAND_TIMEOUT_MS);
 313 }
 314
 315 /*
 316  * Enable/disable the reception of FIS
 317  *
 318  * @port   Pointer to the port data structure
 319  * @enable 1 to enable, 0 to disable
 320  *
 321  * return value
 322  *      Previous state: 1 enabled, 0 disabled
 323  */
 324 static int mtip_enable_fis(struct mtip_port *port, int enable)
 325 {
 326         u32 tmp;
 327
 328         /* enable FIS reception */
 329         tmp = readl(port->mmio + PORT_CMD);
 330         if (enable)
 331                 writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 332         else
 333                 writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 334
 335         /* Flush */
 336         readl(port->mmio + PORT_CMD);
 337
 338         return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX));
 339 }
 340
 341 /*
 342  * Enable/disable the DMA engine
 343  *
 344  * @port   Pointer to the port data structure
 345  * @enable 1 to enable, 0 to disable
 346  *
 347  * return value
 348  *      Previous state: 1 enabled, 0 disabled.
 349  */
 350 static int mtip_enable_engine(struct mtip_port *port, int enable)
 351 {
 352         u32 tmp;
 353
 354         /* enable FIS reception */
 355         tmp = readl(port->mmio + PORT_CMD);
 356         if (enable)
 357                 writel(tmp | PORT_CMD_START, port->mmio + PORT_CMD);
 358         else
 359                 writel(tmp & ~PORT_CMD_START, port->mmio + PORT_CMD);
 360
 361         readl(port->mmio + PORT_CMD);
 362         return (((tmp & PORT_CMD_START) == PORT_CMD_START));
 363 }
 364
 365 /*
 366  * Enables the port DMA engine and FIS reception.
 367  *
 368  * return value
 369  *      None
 370  */
 371 static inline void mtip_start_port(struct mtip_port *port)
 372 {
 373         /* Enable FIS reception */
 374         mtip_enable_fis(port, 1);
 375
 376         /* Enable the DMA engine */
 377         mtip_enable_engine(port, 1);
 378 }
 379
 380 /*
 381  * Deinitialize a port by disabling port interrupts, the DMA engine,
 382  * and FIS reception.
 383  *
 384  * @port Pointer to the port structure
 385  *
 386  * return value
 387  *      None
 388  */
 389 static inline void mtip_deinit_port(struct mtip_port *port)
 390 {
 391         /* Disable interrupts on this port */
 392         writel(0, port->mmio + PORT_IRQ_MASK);
 393
 394         /* Disable the DMA engine */
 395         mtip_enable_engine(port, 0);
 396
 397         /* Disable FIS reception */
 398         mtip_enable_fis(port, 0);
 399 }
 400
 401 /*
 402  * Initialize a port.
 403  *
 404  * This function deinitializes the port by calling mtip_deinit_port() and
 405  * then initializes it by setting the command header and RX FIS addresses,
 406  * clearing the SError register and any pending port interrupts before
 407  * re-enabling the default set of port interrupts.
 408  *
 409  * @port Pointer to the port structure.
 410  *
 411  * return value
 412  *      None
 413  */
 414 static void mtip_init_port(struct mtip_port *port)
 415 {
 416         int i;
 417         mtip_deinit_port(port);
 418
 419         /* Program the command list base and FIS base addresses */
 420         if (readl(port->dd->mmio + HOST_CAP) & HOST_CAP_64) {
 421                 writel((port->command_list_dma >> 16) >> 16,
 422                          port->mmio + PORT_LST_ADDR_HI);
 423                 writel((port->rxfis_dma >> 16) >> 16,
 424                          port->mmio + PORT_FIS_ADDR_HI);
 425         }
 426
 427         writel(port->command_list_dma & 0xFFFFFFFF,
 428                         port->mmio + PORT_LST_ADDR);
 429         writel(port->rxfis_dma & 0xFFFFFFFF, port->mmio + PORT_FIS_ADDR);
 430
 431         /* Clear SError */
 432         writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);
 433
 434         /* reset the completed registers.*/
 435         for (i = 0; i < port->dd->slot_groups; i++)
 436                 writel(0xFFFFFFFF, port->completed[i]);
 437
 438         /* Clear any pending interrupts for this port */
 439         writel(readl(port->mmio + PORT_IRQ_STAT), port->mmio + PORT_IRQ_STAT);
 440
 441         /* Clear any pending interrupts on the HBA. */
 442         writel(readl(port->dd->mmio + HOST_IRQ_STAT),
 443                                         port->dd->mmio + HOST_IRQ_STAT);
 444
 445         /* Enable port interrupts */
 446         writel(DEF_PORT_IRQ, port->mmio + PORT_IRQ_MASK);
 447 }
 448
 449 /*
 450  * Restart a port
 451  *
 452  * @port Pointer to the port data structure.
 453  *
 454  * return value
 455  *      None
 456  */
 457 static void mtip_restart_port(struct mtip_port *port)
 458 {
 459         unsigned long timeout;
 460
 461         /* Disable the DMA engine */
 462         mtip_enable_engine(port, 0);
 463
 464         /* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */
 465         timeout = jiffies + msecs_to_jiffies(500);
 466         while ((readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON)
 467                  && time_before(jiffies, timeout))
 468                 ;
 469
 470         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 471                 return;
 472
 473         /*
 474          * Chip quirk: escalate to hba reset if
 475          * PxCMD.CR not clear after 500 ms
 476          */
 477         if (readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) {
 478                 dev_warn(&port->dd->pdev->dev,
 479                         "PxCMD.CR not clear, escalating reset\n");
 480
 481                 if (hba_reset_nosleep(port->dd))
 482                         dev_err(&port->dd->pdev->dev,
 483                                 "HBA reset escalation failed.\n");
 484
 485                 /* 30 ms delay before com reset to quiesce chip */
 486                 mdelay(30);
 487         }
 488
 489         dev_warn(&port->dd->pdev->dev, "Issuing COM reset\n");
 490
 491         /* Set PxSCTL.DET */
 492         writel(readl(port->mmio + PORT_SCR_CTL) |
 493                          1, port->mmio + PORT_SCR_CTL);
 494         readl(port->mmio + PORT_SCR_CTL);
 495
 496         /* Wait 1 ms to quiesce chip function */
 497         timeout = jiffies + msecs_to_jiffies(1);
 498         while (time_before(jiffies, timeout))
 499                 ;
 500
 501         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 502                 return;
 503
 504         /* Clear PxSCTL.DET */
 505         writel(readl(port->mmio + PORT_SCR_CTL) & ~1,
 506                          port->mmio + PORT_SCR_CTL);
 507         readl(port->mmio + PORT_SCR_CTL);
 508
 509         /* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */
 510         timeout = jiffies + msecs_to_jiffies(500);
 511         while (((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 512                          && time_before(jiffies, timeout))
 513                 ;
 514
 515         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 516                 return;
 517
 518         if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 519                 dev_warn(&port->dd->pdev->dev,
 520                         "COM reset failed\n");
 521
 522         mtip_init_port(port);
 523         mtip_start_port(port);
 524
 525 }
 526
 527 /*
 528  * Helper function for tag logging
 529  */
 530 static void print_tags(struct driver_data *dd,
 531                         char *msg,
 532                         unsigned long *tagbits,
 533                         int cnt)
 534 {
 535         unsigned char tagmap[128];
 536         int group, tagmap_len = 0;
 537
 538         memset(tagmap, 0, sizeof(tagmap));
 539         for (group = SLOTBITS_IN_LONGS; group > 0; group--)
 540                 tagmap_len = sprintf(tagmap + tagmap_len, "%016lX ",
 541                                                 tagbits[group-1]);
 542         dev_warn(&dd->pdev->dev,
 543                         "%d command(s) %s: tagmap [%s]", cnt, msg, tagmap);
 544 }
 545
 546 /*
 547  * Called periodically to see if any read/write commands are
 548  * taking too long to complete.
 549  *
 550  * @data Pointer to the PORT data structure.
 551  *
 552  * return value
 553  *      None
 554  */
 555 static void mtip_timeout_function(unsigned long int data)
 556 {
 557         struct mtip_port *port = (struct mtip_port *) data;
 558         struct host_to_dev_fis *fis;
 559         struct mtip_cmd *command;
 560         int tag, cmdto_cnt = 0;
 561         unsigned int bit, group;
 562         unsigned int num_command_slots = port->dd->slot_groups * 32;
 563         unsigned long to, tagaccum[SLOTBITS_IN_LONGS];
 564
 565         if (unlikely(!port))
 566                 return;
 567
 568         if (test_bit(MTIP_DDF_RESUME_BIT, &port->dd->dd_flag)) {
 569                 mod_timer(&port->cmd_timer,
 570                         jiffies + msecs_to_jiffies(30000));
 571                 return;
 572         }
 573         /* clear the tag accumulator */
 574         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 575
 576         for (tag = 0; tag < num_command_slots; tag++) {
 577                 /*
 578                  * Skip internal command slot as it has
 579                  * its own timeout mechanism
 580                  */
 581                 if (tag == MTIP_TAG_INTERNAL)
 582                         continue;
 583
 584                 if (atomic_read(&port->commands[tag].active) &&
 585                    (time_after(jiffies, port->commands[tag].comp_time))) {
 586                         group = tag >> 5;
 587                         bit = tag & 0x1F;
 588
 589                         command = &port->commands[tag];
 590                         fis = (struct host_to_dev_fis *) command->command;
 591
 592                         set_bit(tag, tagaccum);
 593                         cmdto_cnt++;
 594                         if (cmdto_cnt == 1)
 595                                 set_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
 596
 597                         /*
 598                          * Clear the completed bit. This should prevent
 599                          *  any interrupt handlers from trying to retire
 600                          *  the command.
 601                          */
 602                         writel(1 << bit, port->completed[group]);
 603
 604                         /* Call the async completion callback. */
 605                         if (likely(command->async_callback))
 606                                 command->async_callback(command->async_data,
 607                                                          -EIO);
 608                         command->async_callback = NULL;
 609                         command->comp_func = NULL;
 610
 611                         /* Unmap the DMA scatter list entries */
 612                         dma_unmap_sg(&port->dd->pdev->dev,
 613                                         command->sg,
 614                                         command->scatter_ents,
 615                                         command->direction);
 616
 617                         /*
 618                          * Clear the allocated bit and active tag for the
 619                          * command.
 620                          */
 621                         atomic_set(&port->commands[tag].active, 0);
 622                         release_slot(port, tag);
 623
 624                         up(&port->cmd_slot);
 625                 }
 626         }
 627
 628         if (cmdto_cnt && !test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags)) {
 629                 print_tags(port->dd, "timed out", tagaccum, cmdto_cnt);
 630
 631                 mtip_restart_port(port);
 632                 clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
 633                 wake_up_interruptible(&port->svc_wait);
 634         }
 635
 636         if (port->ic_pause_timer) {
 637                 to  = port->ic_pause_timer + msecs_to_jiffies(1000);
 638                 if (time_after(jiffies, to)) {
 639                         if (!test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags)) {
 640                                 port->ic_pause_timer = 0;
 641                                 clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
 642                                 clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
 643                                 clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
 644                                 wake_up_interruptible(&port->svc_wait);
 645                         }
 646
 647
 648                 }
 649         }
 650
 651         /* Restart the timer */
 652         mod_timer(&port->cmd_timer,
 653                 jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
 654 }
 655
 656 /*
 657  * IO completion function.
 658  *
 659  * This completion function is called by the driver ISR when a
 660  * command that was issued by the kernel completes. It first calls the
 661  * asynchronous completion function which normally calls back into the block
 662  * layer passing the asynchronous callback data, then unmaps the
 663  * scatter list associated with the completed command, and finally
 664  * clears the allocated bit associated with the completed command.
 665  *
 666  * @port   Pointer to the port data structure.
 667  * @tag    Tag of the command.
 668  * @data   Pointer to driver_data.
 669  * @status Completion status.
 670  *
 671  * return value
 672  *      None
 673  */
 674 static void mtip_async_complete(struct mtip_port *port,
 675                                 int tag,
 676                                 void *data,
 677                                 int status)
 678 {
 679         struct mtip_cmd *command;
 680         struct driver_data *dd = data;
 681         int cb_status = status ? -EIO : 0;
 682
 683         if (unlikely(!dd) || unlikely(!port))
 684                 return;
 685
 686         command = &port->commands[tag];
 687
 688         if (unlikely(status == PORT_IRQ_TF_ERR)) {
 689                 dev_warn(&port->dd->pdev->dev,
 690                         "Command tag %d failed due to TFE\n", tag);
 691         }
 692
 693         /* Upper layer callback */
 694         if (likely(command->async_callback))
 695                 command->async_callback(command->async_data, cb_status);
 696
 697         command->async_callback = NULL;
 698         command->comp_func = NULL;
 699
 700         /* Unmap the DMA scatter list entries */
 701         dma_unmap_sg(&dd->pdev->dev,
 702                 command->sg,
 703                 command->scatter_ents,
 704                 command->direction);
 705
 706         /* Clear the allocated and active bits for the command */
 707         atomic_set(&port->commands[tag].active, 0);
 708         release_slot(port, tag);
 709
 710         up(&port->cmd_slot);
 711 }
 712
 713 /*
 714  * Internal command completion callback function.
 715  *
 716  * This function is normally called by the driver ISR when an internal
 717  * command completed. This function signals the command completion by
 718  * calling complete().
 719  *
 720  * @port   Pointer to the port data structure.
 721  * @tag    Tag of the command that has completed.
 722  * @data   Pointer to a completion structure.
 723  * @status Completion status.
 724  *
 725  * return value
 726  *      None
 727  */
 728 static void mtip_completion(struct mtip_port *port,
 729                             int tag,
 730                             void *data,
 731                             int status)
 732 {
 733         struct mtip_cmd *command = &port->commands[tag];
 734         struct completion *waiting = data;
 735         if (unlikely(status == PORT_IRQ_TF_ERR))
 736                 dev_warn(&port->dd->pdev->dev,
 737                         "Internal command %d completed with TFE\n", tag);
 738
 739         command->async_callback = NULL;
 740         command->comp_func = NULL;
 741
 742         complete(waiting);
 743 }
 744
 745 static void mtip_null_completion(struct mtip_port *port,
 746                             int tag,
 747                             void *data,
 748                             int status)
 749 {
 750         return;
 751 }
 752
 753 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
 754                                 dma_addr_t buffer_dma, unsigned int sectors);
 755 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
 756                                                 struct smart_attr *attrib);
 757 /*
 758  * Handle an error.
 759  *
 760  * @dd Pointer to the DRIVER_DATA structure.
 761  *
 762  * return value
 763  *      None
 764  */
 765 static void mtip_handle_tfe(struct driver_data *dd)
 766 {
 767         int group, tag, bit, reissue, rv;
 768         struct mtip_port *port;
 769         struct mtip_cmd  *cmd;
 770         u32 completed;
 771         struct host_to_dev_fis *fis;
 772         unsigned long tagaccum[SLOTBITS_IN_LONGS];
 773         unsigned int cmd_cnt = 0;
 774         unsigned char *buf;
 775         char *fail_reason = NULL;
 776         int fail_all_ncq_write = 0, fail_all_ncq_cmds = 0;
 777
 778         dev_warn(&dd->pdev->dev, "Taskfile error\n");
 779
 780         port = dd->port;
 781
 782         /* Stop the timer to prevent command timeouts. */
 783         del_timer(&port->cmd_timer);
 784         set_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
 785
 786         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) &&
 787                         test_bit(MTIP_TAG_INTERNAL, port->allocated)) {
 788                 cmd = &port->commands[MTIP_TAG_INTERNAL];
 789                 dbg_printk(MTIP_DRV_NAME " TFE for the internal command\n");
 790
 791                 atomic_inc(&cmd->active); /* active > 1 indicates error */
 792                 if (cmd->comp_data && cmd->comp_func) {
 793                         cmd->comp_func(port, MTIP_TAG_INTERNAL,
 794                                         cmd->comp_data, PORT_IRQ_TF_ERR);
 795                 }
 796                 goto handle_tfe_exit;
 797         }
 798
 799         /* clear the tag accumulator */
 800         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 801
 802         /* Loop through all the groups */
 803         for (group = 0; group < dd->slot_groups; group++) {
 804                 completed = readl(port->completed[group]);
 805
 806                 /* clear completed status register in the hardware.*/
 807                 writel(completed, port->completed[group]);
 808
 809                 /* Process successfully completed commands */
 810                 for (bit = 0; bit < 32 && completed; bit++) {
 811                         if (!(completed & (1<<bit)))
 812                                 continue;
 813                         tag = (group << 5) + bit;
 814
 815                         /* Skip the internal command slot */
 816                         if (tag == MTIP_TAG_INTERNAL)
 817                                 continue;
 818
 819                         cmd = &port->commands[tag];
 820                         if (likely(cmd->comp_func)) {
 821                                 set_bit(tag, tagaccum);
 822                                 cmd_cnt++;
 823                                 atomic_set(&cmd->active, 0);
 824                                 cmd->comp_func(port,
 825                                          tag,
 826                                          cmd->comp_data,
 827                                          0);
 828                         } else {
 829                                 dev_err(&port->dd->pdev->dev,
 830                                         "Missing completion func for tag %d",
 831                                         tag);
 832                                 if (mtip_check_surprise_removal(dd->pdev)) {
 833                                         mtip_command_cleanup(dd);
 834                                         /* don't proceed further */
 835                                         return;
 836                                 }
 837                         }
 838                 }
 839         }
 840
 841         print_tags(dd, "completed (TFE)", tagaccum, cmd_cnt);
 842
 843         /* Restart the port */
 844         mdelay(20);
 845         mtip_restart_port(port);
 846
 847         /* Trying to determine the cause of the error */
 848         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
 849                                 dd->port->log_buf,
 850                                 dd->port->log_buf_dma, 1);
 851         if (rv) {
 852                 dev_warn(&dd->pdev->dev,
 853                         "Error in READ LOG EXT (10h) command\n");
 854                 /* non-critical error, don't fail the load */
 855         } else {
 856                 buf = (unsigned char *)dd->port->log_buf;
 857                 if (buf[259] & 0x1) {
 858                         dev_info(&dd->pdev->dev,
 859                                 "Write protect bit is set.\n");
 860                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
 861                         fail_all_ncq_write = 1;
 862                         fail_reason = "write protect";
 863                 }
 864                 if (buf[288] == 0xF7) {
 865                         dev_info(&dd->pdev->dev,
 866                                 "Exceeded Tmax, drive in thermal shutdown.\n");
 867                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
 868                         fail_all_ncq_cmds = 1;
 869                         fail_reason = "thermal shutdown";
 870                 }
 871                 if (buf[288] == 0xBF) {
 872                         dev_info(&dd->pdev->dev,
 873                                 "Drive indicates rebuild has failed.\n");
 874                         fail_all_ncq_cmds = 1;
 875                         fail_reason = "rebuild failed";
 876                 }
 877         }
 878
 879         /* clear the tag accumulator */
 880         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 881
 882         /* Loop through all the groups */
 883         for (group = 0; group < dd->slot_groups; group++) {
 884                 for (bit = 0; bit < 32; bit++) {
 885                         reissue = 1;
 886                         tag = (group << 5) + bit;
 887                         cmd = &port->commands[tag];
 888
 889                         /* If the active bit is set re-issue the command */
 890                         if (atomic_read(&cmd->active) == 0)
 891                                 continue;
 892
 893                         fis = (struct host_to_dev_fis *)cmd->command;
 894
 895                         /* Should re-issue? */
 896                         if (tag == MTIP_TAG_INTERNAL ||
 897                             fis->command == ATA_CMD_SET_FEATURES)
 898                                 reissue = 0;
 899                         else {
 900                                 if (fail_all_ncq_cmds ||
 901                                         (fail_all_ncq_write &&
 902                                         fis->command == ATA_CMD_FPDMA_WRITE)) {
 903                                         dev_warn(&dd->pdev->dev,
 904                                         "  Fail: %s w/tag %d [%s].\n",
 905                                         fis->command == ATA_CMD_FPDMA_WRITE ?
 906                                                 "write" : "read",
 907                                         tag,
 908                                         fail_reason != NULL ?
 909                                                 fail_reason : "unknown");
 910                                         atomic_set(&cmd->active, 0);
 911                                         if (cmd->comp_func) {
 912                                                 cmd->comp_func(port, tag,
 913                                                         cmd->comp_data,
 914                                                         -ENODATA);
 915                                         }
 916                                         continue;
 917                                 }
 918                         }
 919
 920                         /*
 921                          * First check if this command has
 922                          *  exceeded its retries.
 923                          */
 924                         if (reissue && (cmd->retries-- > 0)) {
 925
 926                                 set_bit(tag, tagaccum);
 927
 928                                 /* Re-issue the command. */
 929                                 mtip_issue_ncq_command(port, tag);
 930
 931                                 continue;
 932                         }
 933
 934                         /* Retire a command that will not be reissued */
 935                         dev_warn(&port->dd->pdev->dev,
 936                                 "retiring tag %d\n", tag);
 937                         atomic_set(&cmd->active, 0);
 938
 939                         if (cmd->comp_func)
 940                                 cmd->comp_func(
 941                                         port,
 942                                         tag,
 943                                         cmd->comp_data,
 944                                         PORT_IRQ_TF_ERR);
 945                         else
 946                                 dev_warn(&port->dd->pdev->dev,
 947                                         "Bad completion for tag %d\n",
 948                                         tag);
 949                 }
 950         }
 951         print_tags(dd, "reissued (TFE)", tagaccum, cmd_cnt);
 952
 953 handle_tfe_exit:
 954         /* clear eh_active */
 955         clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
 956         wake_up_interruptible(&port->svc_wait);
 957
 958         mod_timer(&port->cmd_timer,
 959                  jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
 960 }
 961
 962 /*
 963  * Handle a set device bits interrupt
 964  */
 965 static inline void mtip_process_sdbf(struct driver_data *dd)
 966 {
 967         struct mtip_port  *port = dd->port;
 968         int group, tag, bit;
 969         u32 completed;
 970         struct mtip_cmd *command;
 971
 972         /* walk all bits in all slot groups */
 973         for (group = 0; group < dd->slot_groups; group++) {
 974                 completed = readl(port->completed[group]);
 975                 if (!completed)
 976                         continue;
 977
 978                 /* clear completed status register in the hardware.*/
 979                 writel(completed, port->completed[group]);
 980
 981                 /* Process completed commands. */
 982                 for (bit = 0;
 983                      (bit < 32) && completed;
 984                      bit++, completed >>= 1) {
 985                         if (completed & 0x01) {
 986                                 tag = (group << 5) | bit;
 987
 988                                 /* skip internal command slot. */
 989                                 if (unlikely(tag == MTIP_TAG_INTERNAL))
 990                                         continue;
 991
 992                                 command = &port->commands[tag];
 993                                 /* make internal callback */
 994                                 if (likely(command->comp_func)) {
 995                                         command->comp_func(
 996                                                 port,
 997                                                 tag,
 998                                                 command->comp_data,
 999                                                 0);
1000                                 } else {
1001                                         dev_warn(&dd->pdev->dev,
1002                                                 "Null completion "
1003                                                 "for tag %d",
1004                                                 tag);
1005
1006                                         if (mtip_check_surprise_removal(
1007                                                 dd->pdev)) {
1008                                                 mtip_command_cleanup(dd);
1009                                                 return;
1010                                         }
1011                                 }
1012                         }
1013                 }
1014         }
1015 }
1016
1017 /*
1018  * Process legacy pio and d2h interrupts
1019  */
1020 static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat)
1021 {
1022         struct mtip_port *port = dd->port;
1023         struct mtip_cmd *cmd = &port->commands[MTIP_TAG_INTERNAL];
1024
1025         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) &&
1026             (cmd != NULL) && !(readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1027                 & (1 << MTIP_TAG_INTERNAL))) {
1028                 if (cmd->comp_func) {
1029                         cmd->comp_func(port,
1030                                 MTIP_TAG_INTERNAL,
1031                                 cmd->comp_data,
1032                                 0);
1033                         return;
1034                 }
1035         }
1036
1037         return;
1038 }
1039
1040 /*
1041  * Demux and handle errors
1042  */
1043 static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat)
1044 {
1045         if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR)))
1046                 mtip_handle_tfe(dd);
1047
1048         if (unlikely(port_stat & PORT_IRQ_CONNECT)) {
1049                 dev_warn(&dd->pdev->dev,
1050                         "Clearing PxSERR.DIAG.x\n");
1051                 writel((1 << 26), dd->port->mmio + PORT_SCR_ERR);
1052         }
1053
1054         if (unlikely(port_stat & PORT_IRQ_PHYRDY)) {
1055                 dev_warn(&dd->pdev->dev,
1056                         "Clearing PxSERR.DIAG.n\n");
1057                 writel((1 << 16), dd->port->mmio + PORT_SCR_ERR);
1058         }
1059
1060         if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) {
1061                 dev_warn(&dd->pdev->dev,
1062                         "Port stat errors %x unhandled\n",
1063                         (port_stat & ~PORT_IRQ_HANDLED));
1064         }
1065 }
1066
1067 static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
1068 {
1069         struct driver_data *dd = (struct driver_data *) data;
1070         struct mtip_port *port = dd->port;
1071         u32 hba_stat, port_stat;
1072         int rv = IRQ_NONE;
1073
1074         hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
1075         if (hba_stat) {
1076                 rv = IRQ_HANDLED;
1077
1078                 /* Acknowledge the interrupt status on the port.*/
1079                 port_stat = readl(port->mmio + PORT_IRQ_STAT);
1080                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
1081
1082                 /* Demux port status */
1083                 if (likely(port_stat & PORT_IRQ_SDB_FIS))
1084                         mtip_process_sdbf(dd);
1085
1086                 if (unlikely(port_stat & PORT_IRQ_ERR)) {
1087                         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
1088                                 mtip_command_cleanup(dd);
1089                                 /* don't proceed further */
1090                                 return IRQ_HANDLED;
1091                         }
1092                         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1093                                                         &dd->dd_flag))
1094                                 return rv;
1095
1096                         mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
1097                 }
1098
1099                 if (unlikely(port_stat & PORT_IRQ_LEGACY))
1100                         mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY);
1101         }
1102
1103         /* acknowledge interrupt */
1104         writel(hba_stat, dd->mmio + HOST_IRQ_STAT);
1105
1106         return rv;
1107 }
1108
1109 /*
1110  * Wrapper for mtip_handle_irq
1111  * (ignores return code)
1112  */
1113 static void mtip_tasklet(unsigned long data)
1114 {
1115         mtip_handle_irq((struct driver_data *) data);
1116 }
1117
1118 /*
1119  * HBA interrupt subroutine.
1120  *
1121  * @irq         IRQ number.
1122  * @instance    Pointer to the driver data structure.
1123  *
1124  * return value
1125  *      IRQ_HANDLED     A HBA interrupt was pending and handled.
1126  *      IRQ_NONE        This interrupt was not for the HBA.
1127  */
1128 static irqreturn_t mtip_irq_handler(int irq, void *instance)
1129 {
1130         struct driver_data *dd = instance;
1131         tasklet_schedule(&dd->tasklet);
1132         return IRQ_HANDLED;
1133 }
1134
1135 static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
1136 {
1137         atomic_set(&port->commands[tag].active, 1);
1138         writel(1 << MTIP_TAG_BIT(tag),
1139                 port->cmd_issue[MTIP_TAG_INDEX(tag)]);
1140 }
1141
1142 static bool mtip_pause_ncq(struct mtip_port *port,
1143                                 struct host_to_dev_fis *fis)
1144 {
1145         struct host_to_dev_fis *reply;
1146         unsigned long task_file_data;
1147
1148         reply = port->rxfis + RX_FIS_D2H_REG;
1149         task_file_data = readl(port->mmio+PORT_TFDATA);
1150
1151         if (fis->command == ATA_CMD_SEC_ERASE_UNIT)
1152                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1153
1154         if ((task_file_data & 1))
1155                 return false;
1156
1157         if (fis->command == ATA_CMD_SEC_ERASE_PREP) {
1158                 set_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1159                 set_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1160                 port->ic_pause_timer = jiffies;
1161                 return true;
1162         } else if ((fis->command == ATA_CMD_DOWNLOAD_MICRO) &&
1163                                         (fis->features == 0x03)) {
1164                 set_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1165                 port->ic_pause_timer = jiffies;
1166                 return true;
1167         } else if ((fis->command == ATA_CMD_SEC_ERASE_UNIT) ||
1168                 ((fis->command == 0xFC) &&
1169                         (fis->features == 0x27 || fis->features == 0x72 ||
1170                          fis->features == 0x62 || fis->features == 0x26))) {
1171                 /* Com reset after secure erase or lowlevel format */
1172                 mtip_restart_port(port);
1173                 return false;
1174         }
1175
1176         return false;
1177 }
1178
1179 /*
1180  * Wait for port to quiesce
1181  *
1182  * @port    Pointer to port data structure
1183  * @timeout Max duration to wait (ms)
1184  *
1185  * return value
1186  *      0       Success
1187  *      -EBUSY  Commands still active
1188  */
1189 static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
1190 {
1191         unsigned long to;
1192         unsigned int n;
1193         unsigned int active = 1;
1194
1195         to = jiffies + msecs_to_jiffies(timeout);
1196         do {
1197                 if (test_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags) &&
1198                         test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
1199                         msleep(20);
1200                         continue; /* svc thd is actively issuing commands */
1201                 }
1202                 if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1203                         return -EFAULT;
1204                 /*
1205                  * Ignore s_active bit 0 of array element 0.
1206                  * This bit will always be set
1207                  */
1208                 active = readl(port->s_active[0]) & 0xFFFFFFFE;
1209                 for (n = 1; n < port->dd->slot_groups; n++)
1210                         active |= readl(port->s_active[n]);
1211
1212                 if (!active)
1213                         break;
1214
1215                 msleep(20);
1216         } while (time_before(jiffies, to));
1217
1218         return active ? -EBUSY : 0;
1219 }
1220
1221 /*
1222  * Execute an internal command and wait for the completion.
1223  *
1224  * @port    Pointer to the port data structure.
1225  * @fis     Pointer to the FIS that describes the command.
1226  * @fis_len  Length in WORDS of the FIS.
1227  * @buffer  DMA accessible for command data.
1228  * @buf_len  Length, in bytes, of the data buffer.
1229  * @opts    Command header options, excluding the FIS length
1230  *             and the number of PRD entries.
1231  * @timeout Time in ms to wait for the command to complete.
1232  *
1233  * return value
1234  *      0        Command completed successfully.
1235  *      -EFAULT  The buffer address is not correctly aligned.
1236  *      -EBUSY   Internal command or other IO in progress.
1237  *      -EAGAIN  Time out waiting for command to complete.
1238  */
1239 static int mtip_exec_internal_command(struct mtip_port *port,
1240                                         struct host_to_dev_fis *fis,
1241                                         int fis_len,
1242                                         dma_addr_t buffer,
1243                                         int buf_len,
1244                                         u32 opts,
1245                                         gfp_t atomic,
1246                                         unsigned long timeout)
1247 {
1248         struct mtip_cmd_sg *command_sg;
1249         DECLARE_COMPLETION_ONSTACK(wait);
1250         int rv = 0, ready2go = 1;
1251         struct mtip_cmd *int_cmd = &port->commands[MTIP_TAG_INTERNAL];
1252         unsigned long to;
1253
1254         /* Make sure the buffer is 8 byte aligned. This is asic specific. */
1255         if (buffer & 0x00000007) {
1256                 dev_err(&port->dd->pdev->dev,
1257                         "SG buffer is not 8 byte aligned\n");
1258                 return -EFAULT;
1259         }
1260
1261         to = jiffies + msecs_to_jiffies(timeout);
1262         do {
1263                 ready2go = !test_and_set_bit(MTIP_TAG_INTERNAL,
1264                                                 port->allocated);
1265                 if (ready2go)
1266                         break;
1267                 mdelay(100);
1268         } while (time_before(jiffies, to));
1269         if (!ready2go) {
1270                 dev_warn(&port->dd->pdev->dev,
1271                         "Internal cmd active. new cmd [%02X]\n", fis->command);
1272                 return -EBUSY;
1273         }
1274         set_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1275         port->ic_pause_timer = 0;
1276
1277         if (fis->command == ATA_CMD_SEC_ERASE_UNIT)
1278                 clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1279         else if (fis->command == ATA_CMD_DOWNLOAD_MICRO)
1280                 clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1281
1282         if (atomic == GFP_KERNEL) {
1283                 if (fis->command != ATA_CMD_STANDBYNOW1) {
1284                         /* wait for io to complete if non atomic */
1285                         if (mtip_quiesce_io(port, 5000) < 0) {
1286                                 dev_warn(&port->dd->pdev->dev,
1287                                         "Failed to quiesce IO\n");
1288                                 release_slot(port, MTIP_TAG_INTERNAL);
1289                                 clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1290                                 wake_up_interruptible(&port->svc_wait);
1291                                 return -EBUSY;
1292                         }
1293                 }
1294
1295                 /* Set the completion function and data for the command. */
1296                 int_cmd->comp_data = &wait;
1297                 int_cmd->comp_func = mtip_completion;
1298
1299         } else {
1300                 /* Clear completion - we're going to poll */
1301                 int_cmd->comp_data = NULL;
1302                 int_cmd->comp_func = mtip_null_completion;
1303         }
1304
1305         /* Copy the command to the command table */
1306         memcpy(int_cmd->command, fis, fis_len*4);
1307
1308         /* Populate the SG list */
1309         int_cmd->command_header->opts =
1310                  __force_bit2int cpu_to_le32(opts | fis_len);
1311         if (buf_len) {
1312                 command_sg = int_cmd->command + AHCI_CMD_TBL_HDR_SZ;
1313
1314                 command_sg->info =
1315                         __force_bit2int cpu_to_le32((buf_len-1) & 0x3FFFFF);
1316                 command_sg->dba =
1317                         __force_bit2int cpu_to_le32(buffer & 0xFFFFFFFF);
1318                 command_sg->dba_upper =
1319                         __force_bit2int cpu_to_le32((buffer >> 16) >> 16);
1320
1321                 int_cmd->command_header->opts |=
1322                         __force_bit2int cpu_to_le32((1 << 16));
1323         }
1324
1325         /* Populate the command header */
1326         int_cmd->command_header->byte_count = 0;
1327
1328         /* Issue the command to the hardware */
1329         mtip_issue_non_ncq_command(port, MTIP_TAG_INTERNAL);
1330
1331         /* Poll if atomic, wait_for_completion otherwise */
1332         if (atomic == GFP_KERNEL) {
1333                 /* Wait for the command to complete or timeout. */
1334                 if (wait_for_completion_timeout(
1335                                 &wait,
1336                                 msecs_to_jiffies(timeout)) == 0) {
1337                         dev_err(&port->dd->pdev->dev,
1338                                 "Internal command did not complete [%d] "
1339                                 "within timeout of  %lu ms\n",
1340                                 atomic, timeout);
1341                         if (mtip_check_surprise_removal(port->dd->pdev) ||
1342                                 test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1343                                                 &port->dd->dd_flag)) {
1344                                 rv = -ENXIO;
1345                                 goto exec_ic_exit;
1346                         }
1347                         rv = -EAGAIN;
1348                 }
1349         } else {
1350                 /* Spin for <timeout> checking if command still outstanding */
1351                 timeout = jiffies + msecs_to_jiffies(timeout);
1352                 while ((readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1353                                 & (1 << MTIP_TAG_INTERNAL))
1354                                 && time_before(jiffies, timeout)) {
1355                         if (mtip_check_surprise_removal(port->dd->pdev)) {
1356                                 rv = -ENXIO;
1357                                 goto exec_ic_exit;
1358                         }
1359                         if ((fis->command != ATA_CMD_STANDBYNOW1) &&
1360                                 test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1361                                                 &port->dd->dd_flag)) {
1362                                 rv = -ENXIO;
1363                                 goto exec_ic_exit;
1364                         }
1365                         if (readl(port->mmio + PORT_IRQ_STAT) & PORT_IRQ_ERR) {
1366                                 atomic_inc(&int_cmd->active); /* error */
1367                                 break;
1368                         }
1369                 }
1370         }
1371
1372         if (atomic_read(&int_cmd->active) > 1) {
1373                 dev_err(&port->dd->pdev->dev,
1374                         "Internal command [%02X] failed\n", fis->command);
1375                 rv = -EIO;
1376         }
1377         if (readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1378                         & (1 << MTIP_TAG_INTERNAL)) {
1379                 rv = -ENXIO;
1380                 if (!test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1381                                         &port->dd->dd_flag)) {
1382                         mtip_restart_port(port);
1383                         rv = -EAGAIN;
1384                 }
1385         }
1386 exec_ic_exit:
1387         /* Clear the allocated and active bits for the internal command. */
1388         atomic_set(&int_cmd->active, 0);
1389         release_slot(port, MTIP_TAG_INTERNAL);
1390         if (rv >= 0 && mtip_pause_ncq(port, fis)) {
1391                 /* NCQ paused */
1392                 return rv;
1393         }
1394         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1395         wake_up_interruptible(&port->svc_wait);
1396
1397         return rv;
1398 }
1399
1400 /*
1401  * Byte-swap ATA ID strings.
1402  *
1403  * ATA identify data contains strings in byte-swapped 16-bit words.
1404  * They must be swapped (on all architectures) to be usable as C strings.
1405  * This function swaps bytes in-place.
1406  *
1407  * @buf The buffer location of the string
1408  * @len The number of bytes to swap
1409  *
1410  * return value
1411  *      None
1412  */
1413 static inline void ata_swap_string(u16 *buf, unsigned int len)
1414 {
1415         int i;
1416         for (i = 0; i < (len/2); i++)
1417                 be16_to_cpus(&buf[i]);
1418 }
1419
1420 /*
1421  * Request the device identity information.
1422  *
1423  * If a user space buffer is not specified, i.e. is NULL, the
1424  * identify information is still read from the drive and placed
1425  * into the identify data buffer (@e port->identify) in the
1426  * port data structure.
1427  * When the identify buffer contains valid identify information @e
1428  * port->identify_valid is non-zero.
1429  *
1430  * @port         Pointer to the port structure.
1431  * @user_buffer  A user space buffer where the identify data should be
1432  *                    copied.
1433  *
1434  * return value
1435  *      0       Command completed successfully.
1436  *      -EFAULT An error occurred while coping data to the user buffer.
1437  *      -1      Command failed.
1438  */
1439 static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
1440 {
1441         int rv = 0;
1442         struct host_to_dev_fis fis;
1443
1444         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1445                 return -EFAULT;
1446
1447         /* Build the FIS. */
1448         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1449         fis.type        = 0x27;
1450         fis.opts        = 1 << 7;
1451         fis.command     = ATA_CMD_ID_ATA;
1452
1453         /* Set the identify information as invalid. */
1454         port->identify_valid = 0;
1455
1456         /* Clear the identify information. */
1457         memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);
1458
1459         /* Execute the command. */
1460         if (mtip_exec_internal_command(port,
1461                                 &fis,
1462                                 5,
1463                                 port->identify_dma,
1464                                 sizeof(u16) * ATA_ID_WORDS,
1465                                 0,
1466                                 GFP_KERNEL,
1467                                 MTIP_INTERNAL_COMMAND_TIMEOUT_MS)
1468                                 < 0) {
1469                 rv = -1;
1470                 goto out;
1471         }
1472
1473         /*
1474          * Perform any necessary byte-swapping.  Yes, the kernel does in fact
1475          * perform field-sensitive swapping on the string fields.
1476          * See the kernel use of ata_id_string() for proof of this.
1477          */
1478 #ifdef __LITTLE_ENDIAN
1479         ata_swap_string(port->identify + 27, 40);  /* model string*/
1480         ata_swap_string(port->identify + 23, 8);   /* firmware string*/
1481         ata_swap_string(port->identify + 10, 20);  /* serial# string*/
1482 #else
1483         {
1484                 int i;
1485                 for (i = 0; i < ATA_ID_WORDS; i++)
1486                         port->identify[i] = le16_to_cpu(port->identify[i]);
1487         }
1488 #endif
1489
1490         /* Set the identify buffer as valid. */
1491         port->identify_valid = 1;
1492
1493         if (user_buffer) {
1494                 if (copy_to_user(
1495                         user_buffer,
1496                         port->identify,
1497                         ATA_ID_WORDS * sizeof(u16))) {
1498                         rv = -EFAULT;
1499                         goto out;
1500                 }
1501         }
1502
1503 out:
1504         return rv;
1505 }
1506
1507 /*
1508  * Issue a standby immediate command to the device.
1509  *
1510  * @port Pointer to the port structure.
1511  *
1512  * return value
1513  *      0       Command was executed successfully.
1514  *      -1      An error occurred while executing the command.
1515  */
1516 static int mtip_standby_immediate(struct mtip_port *port)
1517 {
1518         int rv;
1519         struct host_to_dev_fis  fis;
1520         unsigned long start;
1521
1522         /* Build the FIS. */
1523         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1524         fis.type        = 0x27;
1525         fis.opts        = 1 << 7;
1526         fis.command     = ATA_CMD_STANDBYNOW1;
1527
1528         start = jiffies;
1529         rv = mtip_exec_internal_command(port,
1530                                         &fis,
1531                                         5,
1532                                         0,
1533                                         0,
1534                                         0,
1535                                         GFP_ATOMIC,
1536                                         15000);
1537         dbg_printk(MTIP_DRV_NAME "Time taken to complete standby cmd: %d ms\n",
1538                         jiffies_to_msecs(jiffies - start));
1539         if (rv)
1540                 dev_warn(&port->dd->pdev->dev,
1541                         "STANDBY IMMEDIATE command failed.\n");
1542
1543         return rv;
1544 }
1545
1546 /*
1547  * Issue a READ LOG EXT command to the device.
1548  *
1549  * @port        pointer to the port structure.
1550  * @page        page number to fetch
1551  * @buffer      pointer to buffer
1552  * @buffer_dma  dma address corresponding to @buffer
1553  * @sectors     page length to fetch, in sectors
1554  *
1555  * return value
1556  *      @rv     return value from mtip_exec_internal_command()
1557  */
1558 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
1559                                 dma_addr_t buffer_dma, unsigned int sectors)
1560 {
1561         struct host_to_dev_fis fis;
1562
1563         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1564         fis.type        = 0x27;
1565         fis.opts        = 1 << 7;
1566         fis.command     = ATA_CMD_READ_LOG_EXT;
1567         fis.sect_count  = sectors & 0xFF;
1568         fis.sect_cnt_ex = (sectors >> 8) & 0xFF;
1569         fis.lba_low     = page;
1570         fis.lba_mid     = 0;
1571         fis.device      = ATA_DEVICE_OBS;
1572
1573         memset(buffer, 0, sectors * ATA_SECT_SIZE);
1574
1575         return mtip_exec_internal_command(port,
1576                                         &fis,
1577                                         5,
1578                                         buffer_dma,
1579                                         sectors * ATA_SECT_SIZE,
1580                                         0,
1581                                         GFP_ATOMIC,
1582                                         MTIP_INTERNAL_COMMAND_TIMEOUT_MS);
1583 }
1584
1585 /*
1586  * Issue a SMART READ DATA command to the device.
1587  *
1588  * @port        pointer to the port structure.
1589  * @buffer      pointer to buffer
1590  * @buffer_dma  dma address corresponding to @buffer
1591  *
1592  * return value
1593  *      @rv     return value from mtip_exec_internal_command()
1594  */
1595 static int mtip_get_smart_data(struct mtip_port *port, u8 *buffer,
1596                                         dma_addr_t buffer_dma)
1597 {
1598         struct host_to_dev_fis fis;
1599
1600         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1601         fis.type        = 0x27;
1602         fis.opts        = 1 << 7;
1603         fis.command     = ATA_CMD_SMART;
1604         fis.features    = 0xD0;
1605         fis.sect_count  = 1;
1606         fis.lba_mid     = 0x4F;
1607         fis.lba_hi      = 0xC2;
1608         fis.device      = ATA_DEVICE_OBS;
1609
1610         return mtip_exec_internal_command(port,
1611                                         &fis,
1612                                         5,
1613                                         buffer_dma,
1614                                         ATA_SECT_SIZE,
1615                                         0,
1616                                         GFP_ATOMIC,
1617                                         15000);
1618 }
1619
1620 /*
1621  * Get the value of a smart attribute
1622  *
1623  * @port        pointer to the port structure
1624  * @id          attribute number
1625  * @attrib      pointer to return attrib information corresponding to @id
1626  *
1627  * return value
1628  *      -EINVAL NULL buffer passed or unsupported attribute @id.
1629  *      -EPERM  Identify data not valid, SMART not supported or not enabled
1630  */
1631 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
1632                                                 struct smart_attr *attrib)
1633 {
1634         int rv, i;
1635         struct smart_attr *pattr;
1636
1637         if (!attrib)
1638                 return -EINVAL;
1639
1640         if (!port->identify_valid) {
1641                 dev_warn(&port->dd->pdev->dev, "IDENTIFY DATA not valid\n");
1642                 return -EPERM;
1643         }
1644         if (!(port->identify[82] & 0x1)) {
1645                 dev_warn(&port->dd->pdev->dev, "SMART not supported\n");
1646                 return -EPERM;
1647         }
1648         if (!(port->identify[85] & 0x1)) {
1649                 dev_warn(&port->dd->pdev->dev, "SMART not enabled\n");
1650                 return -EPERM;
1651         }
1652
1653         memset(port->smart_buf, 0, ATA_SECT_SIZE);
1654         rv = mtip_get_smart_data(port, port->smart_buf, port->smart_buf_dma);
1655         if (rv) {
1656                 dev_warn(&port->dd->pdev->dev, "Failed to ge SMART data\n");
1657                 return rv;
1658         }
1659
1660         pattr = (struct smart_attr *)(port->smart_buf + 2);
1661         for (i = 0; i < 29; i++, pattr++)
1662                 if (pattr->attr_id == id) {
1663                         memcpy(attrib, pattr, sizeof(struct smart_attr));
1664                         break;
1665                 }
1666
1667         if (i == 29) {
1668                 dev_warn(&port->dd->pdev->dev,
1669                         "Query for invalid SMART attribute ID\n");
1670                 rv = -EINVAL;
1671         }
1672
1673         return rv;
1674 }
1675
1676 /*
1677  * Get the drive capacity.
1678  *
1679  * @dd      Pointer to the device data structure.
1680  * @sectors Pointer to the variable that will receive the sector count.
1681  *
1682  * return value
1683  *      1 Capacity was returned successfully.
1684  *      0 The identify information is invalid.
1685  */
1686 static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
1687 {
1688         struct mtip_port *port = dd->port;
1689         u64 total, raw0, raw1, raw2, raw3;
1690         raw0 = port->identify[100];
1691         raw1 = port->identify[101];
1692         raw2 = port->identify[102];
1693         raw3 = port->identify[103];
1694         total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
1695         *sectors = total;
1696         return (bool) !!port->identify_valid;
1697 }
1698
1699 /*
1700  * Reset the HBA.
1701  *
1702  * Resets the HBA by setting the HBA Reset bit in the Global
1703  * HBA Control register. After setting the HBA Reset bit the
1704  * function waits for 1 second before reading the HBA Reset
1705  * bit to make sure it has cleared. If HBA Reset is not clear
1706  * an error is returned. Cannot be used in non-blockable
1707  * context.
1708  *
1709  * @dd Pointer to the driver data structure.
1710  *
1711  * return value
1712  *      0  The reset was successful.
1713  *      -1 The HBA Reset bit did not clear.
1714  */
1715 static int mtip_hba_reset(struct driver_data *dd)
1716 {
1717         mtip_deinit_port(dd->port);
1718
1719         /* Set the reset bit */
1720         writel(HOST_RESET, dd->mmio + HOST_CTL);
1721
1722         /* Flush */
1723         readl(dd->mmio + HOST_CTL);
1724
1725         /* Wait for reset to clear */
1726         ssleep(1);
1727
1728         /* Check the bit has cleared */
1729         if (readl(dd->mmio + HOST_CTL) & HOST_RESET) {
1730                 dev_err(&dd->pdev->dev,
1731                         "Reset bit did not clear.\n");
1732                 return -1;
1733         }
1734
1735         return 0;
1736 }
1737
1738 /*
1739  * Display the identify command data.
1740  *
1741  * @port Pointer to the port data structure.
1742  *
1743  * return value
1744  *      None
1745  */
1746 static void mtip_dump_identify(struct mtip_port *port)
1747 {
1748         sector_t sectors;
1749         unsigned short revid;
1750         char cbuf[42];
1751
1752         if (!port->identify_valid)
1753                 return;
1754
1755         strlcpy(cbuf, (char *)(port->identify+10), 21);
1756         dev_info(&port->dd->pdev->dev,
1757                 "Serial No.: %s\n", cbuf);
1758
1759         strlcpy(cbuf, (char *)(port->identify+23), 9);
1760         dev_info(&port->dd->pdev->dev,
1761                 "Firmware Ver.: %s\n", cbuf);
1762
1763         strlcpy(cbuf, (char *)(port->identify+27), 41);
1764         dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);
1765
1766         if (mtip_hw_get_capacity(port->dd, &sectors))
1767                 dev_info(&port->dd->pdev->dev,
1768                         "Capacity: %llu sectors (%llu MB)\n",
1769                          (u64)sectors,
1770                          ((u64)sectors) * ATA_SECT_SIZE >> 20);
1771
1772         pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
1773         switch (revid & 0xFF) {
1774         case 0x1:
1775                 strlcpy(cbuf, "A0", 3);
1776                 break;
1777         case 0x3:
1778                 strlcpy(cbuf, "A2", 3);
1779                 break;
1780         default:
1781                 strlcpy(cbuf, "?", 2);
1782                 break;
1783         }
1784         dev_info(&port->dd->pdev->dev,
1785                 "Card Type: %s\n", cbuf);
1786 }
1787
1788 /*
1789  * Map the commands scatter list into the command table.
1790  *
1791  * @command Pointer to the command.
1792  * @nents Number of scatter list entries.
1793  *
1794  * return value
1795  *      None
1796  */
1797 static inline void fill_command_sg(struct driver_data *dd,
1798                                 struct mtip_cmd *command,
1799                                 int nents)
1800 {
1801         int n;
1802         unsigned int dma_len;
1803         struct mtip_cmd_sg *command_sg;
1804         struct scatterlist *sg = command->sg;
1805
1806         command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
1807
1808         for (n = 0; n < nents; n++) {
1809                 dma_len = sg_dma_len(sg);
1810                 if (dma_len > 0x400000)
1811                         dev_err(&dd->pdev->dev,
1812                                 "DMA segment length truncated\n");
1813                 command_sg->info = __force_bit2int
1814                         cpu_to_le32((dma_len-1) & 0x3FFFFF);
1815                 command_sg->dba = __force_bit2int
1816                         cpu_to_le32(sg_dma_address(sg));
1817                 command_sg->dba_upper = __force_bit2int
1818                         cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
1819                 command_sg++;
1820                 sg++;
1821         }
1822 }
1823
1824 /*
1825  * @brief Execute a drive command.
1826  *
1827  * return value 0 The command completed successfully.
1828  * return value -1 An error occurred while executing the command.
1829  */
1830 static int exec_drive_task(struct mtip_port *port, u8 *command)
1831 {
1832         struct host_to_dev_fis  fis;
1833         struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
1834
1835         /* Build the FIS. */
1836         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1837         fis.type        = 0x27;
1838         fis.opts        = 1 << 7;
1839         fis.command     = command[0];
1840         fis.features    = command[1];
1841         fis.sect_count  = command[2];
1842         fis.sector      = command[3];
1843         fis.cyl_low     = command[4];
1844         fis.cyl_hi      = command[5];
1845         fis.device      = command[6] & ~0x10; /* Clear the dev bit*/
1846
1847         dbg_printk(MTIP_DRV_NAME " %s: User Command: cmd %x, feat %x, nsect %x, sect %x, lcyl %x, hcyl %x, sel %x\n",
1848                 __func__,
1849                 command[0],
1850                 command[1],
1851                 command[2],
1852                 command[3],
1853                 command[4],
1854                 command[5],
1855                 command[6]);
1856
1857         /* Execute the command. */
1858         if (mtip_exec_internal_command(port,
1859                                  &fis,
1860                                  5,
1861                                  0,
1862                                  0,
1863                                  0,
1864                                  GFP_KERNEL,
1865                                  MTIP_IOCTL_COMMAND_TIMEOUT_MS) < 0) {
1866                 return -1;
1867         }
1868
1869         command[0] = reply->command; /* Status*/
1870         command[1] = reply->features; /* Error*/
1871         command[4] = reply->cyl_low;
1872         command[5] = reply->cyl_hi;
1873
1874         dbg_printk(MTIP_DRV_NAME " %s: Completion Status: stat %x, err %x , cyl_lo %x cyl_hi %x\n",
1875                 __func__,
1876                 command[0],
1877                 command[1],
1878                 command[4],
1879                 command[5]);
1880
1881         return 0;
1882 }
1883
1884 /*
1885  * @brief Execute a drive command.
1886  *
1887  * @param port Pointer to the port data structure.
1888  * @param command Pointer to the user specified command parameters.
1889  * @param user_buffer Pointer to the user space buffer where read sector
1890  *                   data should be copied.
1891  *
1892  * return value 0 The command completed successfully.
1893  * return value -EFAULT An error occurred while copying the completion
1894  *                 data to the user space buffer.
1895  * return value -1 An error occurred while executing the command.
1896  */
1897 static int exec_drive_command(struct mtip_port *port, u8 *command,
1898                                 void __user *user_buffer)
1899 {
1900         struct host_to_dev_fis  fis;
1901         struct host_to_dev_fis *reply;
1902         u8 *buf = NULL;
1903         dma_addr_t dma_addr = 0;
1904         int rv = 0, xfer_sz = command[3];
1905
1906         if (xfer_sz) {
1907                 if (!user_buffer)
1908                         return -EFAULT;
1909
1910                 buf = dmam_alloc_coherent(&port->dd->pdev->dev,
1911                                 ATA_SECT_SIZE * xfer_sz,
1912                                 &dma_addr,
1913                                 GFP_KERNEL);
1914                 if (!buf) {
1915                         dev_err(&port->dd->pdev->dev,
1916                                 "Memory allocation failed (%d bytes)\n",
1917                                 ATA_SECT_SIZE * xfer_sz);
1918                         return -ENOMEM;
1919                 }
1920                 memset(buf, 0, ATA_SECT_SIZE * xfer_sz);
1921         }
1922
1923         /* Build the FIS. */
1924         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1925         fis.type        = 0x27;
1926         fis.opts        = 1 << 7;
1927         fis.command     = command[0];
1928         fis.features    = command[2];
1929         fis.sect_count  = command[3];
1930         if (fis.command == ATA_CMD_SMART) {
1931                 fis.sector      = command[1];
1932                 fis.cyl_low     = 0x4F;
1933                 fis.cyl_hi      = 0xC2;
1934         }
1935
1936         if (xfer_sz)
1937                 reply = (port->rxfis + RX_FIS_PIO_SETUP);
1938         else
1939                 reply = (port->rxfis + RX_FIS_D2H_REG);
1940
1941         dbg_printk(MTIP_DRV_NAME
1942                 " %s: User Command: cmd %x, sect %x, "
1943                 "feat %x, sectcnt %x\n",
1944                 __func__,
1945                 command[0],
1946                 command[1],
1947                 command[2],
1948                 command[3]);
1949
1950         /* Execute the command. */
1951         if (mtip_exec_internal_command(port,
1952                                 &fis,
1953                                  5,
1954                                  (xfer_sz ? dma_addr : 0),
1955                                  (xfer_sz ? ATA_SECT_SIZE * xfer_sz : 0),
1956                                  0,
1957                                  GFP_KERNEL,
1958                                  MTIP_IOCTL_COMMAND_TIMEOUT_MS)
1959                                  < 0) {
1960                 rv = -EFAULT;
1961                 goto exit_drive_command;
1962         }
1963
1964         /* Collect the completion status. */
1965         command[0] = reply->command; /* Status*/
1966         command[1] = reply->features; /* Error*/
1967         command[2] = reply->sect_count;
1968
1969         dbg_printk(MTIP_DRV_NAME
1970                 " %s: Completion Status: stat %x, "
1971                 "err %x, nsect %x\n",
1972                 __func__,
1973                 command[0],
1974                 command[1],
1975                 command[2]);
1976
1977         if (xfer_sz) {
1978                 if (copy_to_user(user_buffer,
1979                                  buf,
1980                                  ATA_SECT_SIZE * command[3])) {
1981                         rv = -EFAULT;
1982                         goto exit_drive_command;
1983                 }
1984         }
1985 exit_drive_command:
1986         if (buf)
1987                 dmam_free_coherent(&port->dd->pdev->dev,
1988                                 ATA_SECT_SIZE * xfer_sz, buf, dma_addr);
1989         return rv;
1990 }
1991
1992 /*
1993  *  Indicates whether a command has a single sector payload.
1994  *
1995  *  @command passed to the device to perform the certain event.
1996  *  @features passed to the device to perform the certain event.
1997  *
1998  *  return value
1999  *      1       command is one that always has a single sector payload,
2000  *              regardless of the value in the Sector Count field.
2001  *      0       otherwise
2002  *
2003  */
2004 static unsigned int implicit_sector(unsigned char command,
2005                                     unsigned char features)
2006 {
2007         unsigned int rv = 0;
2008
2009         /* list of commands that have an implicit sector count of 1 */
2010         switch (command) {
2011         case ATA_CMD_SEC_SET_PASS:
2012         case ATA_CMD_SEC_UNLOCK:
2013         case ATA_CMD_SEC_ERASE_PREP:
2014         case ATA_CMD_SEC_ERASE_UNIT:
2015         case ATA_CMD_SEC_FREEZE_LOCK:
2016         case ATA_CMD_SEC_DISABLE_PASS:
2017         case ATA_CMD_PMP_READ:
2018         case ATA_CMD_PMP_WRITE:
2019                 rv = 1;
2020                 break;
2021         case ATA_CMD_SET_MAX:
2022                 if (features == ATA_SET_MAX_UNLOCK)
2023                         rv = 1;
2024                 break;
2025         case ATA_CMD_SMART:
2026                 if ((features == ATA_SMART_READ_VALUES) ||
2027                                 (features == ATA_SMART_READ_THRESHOLDS))
2028                         rv = 1;
2029                 break;
2030         case ATA_CMD_CONF_OVERLAY:
2031                 if ((features == ATA_DCO_IDENTIFY) ||
2032                                 (features == ATA_DCO_SET))
2033                         rv = 1;
2034                 break;
2035         }
2036         return rv;
2037 }
2038
2039 static void mtip_set_timeout(struct host_to_dev_fis *fis, unsigned int *timeout)
2040 {
2041         switch (fis->command) {
2042         case ATA_CMD_DOWNLOAD_MICRO:
2043                 *timeout = 120000; /* 2 minutes */
2044                 break;
2045         case ATA_CMD_SEC_ERASE_UNIT:
2046         case 0xFC:
2047                 *timeout = 240000; /* 4 minutes */
2048                 break;
2049         case ATA_CMD_STANDBYNOW1:
2050                 *timeout = 120000;  /* 2 minutes */
2051                 break;
2052         case 0xF7:
2053         case 0xFA:
2054                 *timeout = 60000;  /* 60 seconds */
2055                 break;
2056         case ATA_CMD_SMART:
2057                 *timeout = 15000;  /* 15 seconds */
2058                 break;
2059         default:
2060                 *timeout = MTIP_IOCTL_COMMAND_TIMEOUT_MS;
2061                 break;
2062         }
2063 }
2064
2065 /*
2066  * Executes a taskfile
2067  * See ide_taskfile_ioctl() for derivation
2068  */
2069 static int exec_drive_taskfile(struct driver_data *dd,
2070                                void __user *buf,
2071                                ide_task_request_t *req_task,
2072                                int outtotal)
2073 {
2074         struct host_to_dev_fis  fis;
2075         struct host_to_dev_fis *reply;
2076         u8 *outbuf = NULL;
2077         u8 *inbuf = NULL;
2078         dma_addr_t outbuf_dma = 0;
2079         dma_addr_t inbuf_dma = 0;
2080         dma_addr_t dma_buffer = 0;
2081         int err = 0;
2082         unsigned int taskin = 0;
2083         unsigned int taskout = 0;
2084         u8 nsect = 0;
2085         unsigned int timeout;
2086         unsigned int force_single_sector;
2087         unsigned int transfer_size;
2088         unsigned long task_file_data;
2089         int intotal = outtotal + req_task->out_size;
2090
2091         taskout = req_task->out_size;
2092         taskin = req_task->in_size;
2093         /* 130560 = 512 * 0xFF*/
2094         if (taskin > 130560 || taskout > 130560) {
2095                 err = -EINVAL;
2096                 goto abort;
2097         }
2098
2099         if (taskout) {
2100                 outbuf = kzalloc(taskout, GFP_KERNEL);
2101                 if (outbuf == NULL) {
2102                         err = -ENOMEM;
2103                         goto abort;
2104                 }
2105                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
2106                         err = -EFAULT;
2107                         goto abort;
2108                 }
2109                 outbuf_dma = pci_map_single(dd->pdev,
2110                                          outbuf,
2111                                          taskout,
2112                                          DMA_TO_DEVICE);
2113                 if (outbuf_dma == 0) {
2114                         err = -ENOMEM;
2115                         goto abort;
2116                 }
2117                 dma_buffer = outbuf_dma;
2118         }
2119
2120         if (taskin) {
2121                 inbuf = kzalloc(taskin, GFP_KERNEL);
2122                 if (inbuf == NULL) {
2123                         err = -ENOMEM;
2124                         goto abort;
2125                 }
2126
2127                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
2128                         err = -EFAULT;
2129                         goto abort;
2130                 }
2131                 inbuf_dma = pci_map_single(dd->pdev,
2132                                          inbuf,
2133                                          taskin, DMA_FROM_DEVICE);
2134                 if (inbuf_dma == 0) {
2135                         err = -ENOMEM;
2136                         goto abort;
2137                 }
2138                 dma_buffer = inbuf_dma;
2139         }
2140
2141         /* only supports PIO and non-data commands from this ioctl. */
2142         switch (req_task->data_phase) {
2143         case TASKFILE_OUT:
2144                 nsect = taskout / ATA_SECT_SIZE;
2145                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
2146                 break;
2147         case TASKFILE_IN:
2148                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
2149                 break;
2150         case TASKFILE_NO_DATA:
2151                 reply = (dd->port->rxfis + RX_FIS_D2H_REG);
2152                 break;
2153         default:
2154                 err = -EINVAL;
2155                 goto abort;
2156         }
2157
2158         /* Build the FIS. */
2159         memset(&fis, 0, sizeof(struct host_to_dev_fis));
2160
2161         fis.type        = 0x27;
2162         fis.opts        = 1 << 7;
2163         fis.command     = req_task->io_ports[7];
2164         fis.features    = req_task->io_ports[1];
2165         fis.sect_count  = req_task->io_ports[2];
2166         fis.lba_low     = req_task->io_ports[3];
2167         fis.lba_mid     = req_task->io_ports[4];
2168         fis.lba_hi      = req_task->io_ports[5];
2169          /* Clear the dev bit*/
2170         fis.device      = req_task->io_ports[6] & ~0x10;
2171
2172         if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
2173                 req_task->in_flags.all  =
2174                         IDE_TASKFILE_STD_IN_FLAGS |
2175                         (IDE_HOB_STD_IN_FLAGS << 8);
2176                 fis.lba_low_ex          = req_task->hob_ports[3];
2177                 fis.lba_mid_ex          = req_task->hob_ports[4];
2178                 fis.lba_hi_ex           = req_task->hob_ports[5];
2179                 fis.features_ex         = req_task->hob_ports[1];
2180                 fis.sect_cnt_ex         = req_task->hob_ports[2];
2181
2182         } else {
2183                 req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
2184         }
2185
2186         force_single_sector = implicit_sector(fis.command, fis.features);
2187
2188         if ((taskin || taskout) && (!fis.sect_count)) {
2189                 if (nsect)
2190                         fis.sect_count = nsect;
2191                 else {
2192                         if (!force_single_sector) {
2193                                 dev_warn(&dd->pdev->dev,
2194                                         "data movement but "
2195                                         "sect_count is 0\n");
2196                                         err = -EINVAL;
2197                                         goto abort;
2198                         }
2199                 }
2200         }
2201
2202         dbg_printk(MTIP_DRV_NAME
2203                 " %s: cmd %x, feat %x, nsect %x,"
2204                 " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
2205                 " head/dev %x\n",
2206                 __func__,
2207                 fis.command,
2208                 fis.features,
2209                 fis.sect_count,
2210                 fis.lba_low,
2211                 fis.lba_mid,
2212                 fis.lba_hi,
2213                 fis.device);
2214
2215         mtip_set_timeout(&fis, &timeout);
2216
2217         /* Determine the correct transfer size.*/
2218         if (force_single_sector)
2219                 transfer_size = ATA_SECT_SIZE;
2220         else
2221                 transfer_size = ATA_SECT_SIZE * fis.sect_count;
2222
2223         /* Execute the command.*/
2224         if (mtip_exec_internal_command(dd->port,
2225                                  &fis,
2226                                  5,
2227                                  dma_buffer,
2228                                  transfer_size,
2229                                  0,
2230                                  GFP_KERNEL,
2231                                  timeout) < 0) {
2232                 err = -EIO;
2233                 goto abort;
2234         }
2235
2236         task_file_data = readl(dd->port->mmio+PORT_TFDATA);
2237
2238         if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
2239                 reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
2240                 req_task->io_ports[7] = reply->control;
2241         } else {
2242                 reply = dd->port->rxfis + RX_FIS_D2H_REG;
2243                 req_task->io_ports[7] = reply->command;
2244         }
2245
2246         /* reclaim the DMA buffers.*/
2247         if (inbuf_dma)
2248                 pci_unmap_single(dd->pdev, inbuf_dma,
2249                         taskin, DMA_FROM_DEVICE);
2250         if (outbuf_dma)
2251                 pci_unmap_single(dd->pdev, outbuf_dma,
2252                         taskout, DMA_TO_DEVICE);
2253         inbuf_dma  = 0;
2254         outbuf_dma = 0;
2255
2256         /* return the ATA registers to the caller.*/
2257         req_task->io_ports[1] = reply->features;
2258         req_task->io_ports[2] = reply->sect_count;
2259         req_task->io_ports[3] = reply->lba_low;
2260         req_task->io_ports[4] = reply->lba_mid;
2261         req_task->io_ports[5] = reply->lba_hi;
2262         req_task->io_ports[6] = reply->device;
2263
2264         if (req_task->out_flags.all & 1)  {
2265
2266                 req_task->hob_ports[3] = reply->lba_low_ex;
2267                 req_task->hob_ports[4] = reply->lba_mid_ex;
2268                 req_task->hob_ports[5] = reply->lba_hi_ex;
2269                 req_task->hob_ports[1] = reply->features_ex;
2270                 req_task->hob_ports[2] = reply->sect_cnt_ex;
2271         }
2272         dbg_printk(MTIP_DRV_NAME
2273                 " %s: Completion: stat %x,"
2274                 "err %x, sect_cnt %x, lbalo %x,"
2275                 "lbamid %x, lbahi %x, dev %x\n",
2276                 __func__,
2277                 req_task->io_ports[7],
2278                 req_task->io_ports[1],
2279                 req_task->io_ports[2],
2280                 req_task->io_ports[3],
2281                 req_task->io_ports[4],
2282                 req_task->io_ports[5],
2283                 req_task->io_ports[6]);
2284
2285         if (taskout) {
2286                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
2287                         err = -EFAULT;
2288                         goto abort;
2289                 }
2290         }
2291         if (taskin) {
2292                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
2293                         err = -EFAULT;
2294                         goto abort;
2295                 }
2296         }
2297 abort:
2298         if (inbuf_dma)
2299                 pci_unmap_single(dd->pdev, inbuf_dma,
2300                                         taskin, DMA_FROM_DEVICE);
2301         if (outbuf_dma)
2302                 pci_unmap_single(dd->pdev, outbuf_dma,
2303                                         taskout, DMA_TO_DEVICE);
2304         kfree(outbuf);
2305         kfree(inbuf);
2306
2307         return err;
2308 }
2309
2310 /*
2311  * Handle IOCTL calls from the Block Layer.
2312  *
2313  * This function is called by the Block Layer when it receives an IOCTL
2314  * command that it does not understand. If the IOCTL command is not supported
2315  * this function returns -ENOTTY.
2316  *
2317  * @dd  Pointer to the driver data structure.
2318  * @cmd IOCTL command passed from the Block Layer.
2319  * @arg IOCTL argument passed from the Block Layer.
2320  *
2321  * return value
2322  *      0       The IOCTL completed successfully.
2323  *      -ENOTTY The specified command is not supported.
2324  *      -EFAULT An error occurred copying data to a user space buffer.
2325  *      -EIO    An error occurred while executing the command.
2326  */
2327 static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
2328                          unsigned long arg)
2329 {
2330         switch (cmd) {
2331         case HDIO_GET_IDENTITY:
2332         {
2333                 if (copy_to_user((void __user *)arg, dd->port->identify,
2334                                                 sizeof(u16) * ATA_ID_WORDS))
2335                         return -EFAULT;
2336                 break;
2337         }
2338         case HDIO_DRIVE_CMD:
2339         {
2340                 u8 drive_command[4];
2341
2342                 /* Copy the user command info to our buffer. */
2343                 if (copy_from_user(drive_command,
2344                                          (void __user *) arg,
2345                                          sizeof(drive_command)))
2346                         return -EFAULT;
2347
2348                 /* Execute the drive command. */
2349                 if (exec_drive_command(dd->port,
2350                                          drive_command,
2351                                          (void __user *) (arg+4)))
2352                         return -EIO;
2353
2354                 /* Copy the status back to the users buffer. */
2355                 if (copy_to_user((void __user *) arg,
2356                                          drive_command,
2357                                          sizeof(drive_command)))
2358                         return -EFAULT;
2359
2360                 break;
2361         }
2362         case HDIO_DRIVE_TASK:
2363         {
2364                 u8 drive_command[7];
2365
2366                 /* Copy the user command info to our buffer. */
2367                 if (copy_from_user(drive_command,
2368                                          (void __user *) arg,
2369                                          sizeof(drive_command)))
2370                         return -EFAULT;
2371
2372                 /* Execute the drive command. */
2373                 if (exec_drive_task(dd->port, drive_command))
2374                         return -EIO;
2375
2376                 /* Copy the status back to the users buffer. */
2377                 if (copy_to_user((void __user *) arg,
2378                                          drive_command,
2379                                          sizeof(drive_command)))
2380                         return -EFAULT;
2381
2382                 break;
2383         }
2384         case HDIO_DRIVE_TASKFILE: {
2385                 ide_task_request_t req_task;
2386                 int ret, outtotal;
2387
2388                 if (copy_from_user(&req_task, (void __user *) arg,
2389                                         sizeof(req_task)))
2390                         return -EFAULT;
2391
2392                 outtotal = sizeof(req_task);
2393
2394                 ret = exec_drive_taskfile(dd, (void __user *) arg,
2395                                                 &req_task, outtotal);
2396
2397                 if (copy_to_user((void __user *) arg, &req_task,
2398                                                         sizeof(req_task)))
2399                         return -EFAULT;
2400
2401                 return ret;
2402         }
2403
2404         default:
2405                 return -EINVAL;
2406         }
2407         return 0;
2408 }
2409
2410 /*
2411  * Submit an IO to the hw
2412  *
2413  * This function is called by the block layer to issue an io
2414  * to the device. Upon completion, the callback function will
2415  * be called with the data parameter passed as the callback data.
2416  *
2417  * @dd       Pointer to the driver data structure.
2418  * @start    First sector to read.
2419  * @nsect    Number of sectors to read.
2420  * @nents    Number of entries in scatter list for the read command.
2421  * @tag      The tag of this read command.
2422  * @callback Pointer to the function that should be called
2423  *           when the read completes.
2424  * @data     Callback data passed to the callback function
2425  *           when the read completes.
2426  * @dir      Direction (read or write)
2427  *
2428  * return value
2429  *      None
2430  */
2431 static void mtip_hw_submit_io(struct driver_data *dd, sector_t start,
2432                               int nsect, int nents, int tag, void *callback,
2433                               void *data, int dir)
2434 {
2435         struct host_to_dev_fis  *fis;
2436         struct mtip_port *port = dd->port;
2437         struct mtip_cmd *command = &port->commands[tag];
2438         int dma_dir = (dir == READ) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2439
2440         /* Map the scatter list for DMA access */
2441         nents = dma_map_sg(&dd->pdev->dev, command->sg, nents, dma_dir);
2442
2443         command->scatter_ents = nents;
2444
2445         /*
2446          * The number of retries for this command before it is
2447          * reported as a failure to the upper layers.
2448          */
2449         command->retries = MTIP_MAX_RETRIES;
2450
2451         /* Fill out fis */
2452         fis = command->command;
2453         fis->type        = 0x27;
2454         fis->opts        = 1 << 7;
2455         fis->command     =
2456                 (dir == READ ? ATA_CMD_FPDMA_READ : ATA_CMD_FPDMA_WRITE);
2457         *((unsigned int *) &fis->lba_low) = (start & 0xFFFFFF);
2458         *((unsigned int *) &fis->lba_low_ex) = ((start >> 24) & 0xFFFFFF);
2459         fis->device      = 1 << 6;
2460         fis->features    = nsect & 0xFF;
2461         fis->features_ex = (nsect >> 8) & 0xFF;
2462         fis->sect_count  = ((tag << 3) | (tag >> 5));
2463         fis->sect_cnt_ex = 0;
2464         fis->control     = 0;
2465         fis->res2        = 0;
2466         fis->res3        = 0;
2467         fill_command_sg(dd, command, nents);
2468
2469         /* Populate the command header */
2470         command->command_header->opts =
2471                         __force_bit2int cpu_to_le32(
2472                                 (nents << 16) | 5 | AHCI_CMD_PREFETCH);
2473         command->command_header->byte_count = 0;
2474
2475         /*
2476          * Set the completion function and data for the command
2477          * within this layer.
2478          */
2479         command->comp_data = dd;
2480         command->comp_func = mtip_async_complete;
2481         command->direction = dma_dir;
2482
2483         /*
2484          * Set the completion function and data for the command passed
2485          * from the upper layer.
2486          */
2487         command->async_data = data;
2488         command->async_callback = callback;
2489
2490         /*
2491          * To prevent this command from being issued
2492          * if an internal command is in progress or error handling is active.
2493          */
2494         if (port->flags & MTIP_PF_PAUSE_IO) {
2495                 set_bit(tag, port->cmds_to_issue);
2496                 set_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2497                 return;
2498         }
2499
2500         /* Issue the command to the hardware */
2501         mtip_issue_ncq_command(port, tag);
2502
2503         return;
2504 }
2505
2506 /*
2507  * Release a command slot.
2508  *
2509  * @dd  Pointer to the driver data structure.
2510  * @tag Slot tag
2511  *
2512  * return value
2513  *      None
2514  */
2515 static void mtip_hw_release_scatterlist(struct driver_data *dd, int tag)
2516 {
2517         release_slot(dd->port, tag);
2518 }
2519
2520 /*
2521  * Obtain a command slot and return its associated scatter list.
2522  *
2523  * @dd  Pointer to the driver data structure.
2524  * @tag Pointer to an int that will receive the allocated command
2525  *            slot tag.
2526  *
2527  * return value
2528  *      Pointer to the scatter list for the allocated command slot
2529  *      or NULL if no command slots are available.
2530  */
2531 static struct scatterlist *mtip_hw_get_scatterlist(struct driver_data *dd,
2532                                                    int *tag)
2533 {
2534         /*
2535          * It is possible that, even with this semaphore, a thread
2536          * may think that no command slots are available. Therefore, we
2537          * need to make an attempt to get_slot().
2538          */
2539         down(&dd->port->cmd_slot);
2540         *tag = get_slot(dd->port);
2541
2542         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
2543                 up(&dd->port->cmd_slot);
2544                 return NULL;
2545         }
2546         if (unlikely(*tag < 0)) {
2547                 up(&dd->port->cmd_slot);
2548                 return NULL;
2549         }
2550
2551         return dd->port->commands[*tag].sg;
2552 }
2553
2554 /*
2555  * Sysfs status dump.
2556  *
2557  * @dev  Pointer to the device structure, passed by the kernrel.
2558  * @attr Pointer to the device_attribute structure passed by the kernel.
2559  * @buf  Pointer to the char buffer that will receive the stats info.
2560  *
2561  * return value
2562  *      The size, in bytes, of the data copied into buf.
2563  */
2564 static ssize_t mtip_hw_show_status(struct device *dev,
2565                                 struct device_attribute *attr,
2566                                 char *buf)
2567 {
2568         struct driver_data *dd = dev_to_disk(dev)->private_data;
2569         int size = 0;
2570
2571         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
2572                 size += sprintf(buf, "%s", "thermal_shutdown\n");
2573         else if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag))
2574                 size += sprintf(buf, "%s", "write_protect\n");
2575         else
2576                 size += sprintf(buf, "%s", "online\n");
2577
2578         return size;
2579 }
2580
2581 static DEVICE_ATTR(status, S_IRUGO, mtip_hw_show_status, NULL);
2582
2583 static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
2584                                   size_t len, loff_t *offset)
2585 {
2586         struct driver_data *dd =  (struct driver_data *)f->private_data;
2587         char buf[MTIP_DFS_MAX_BUF_SIZE];
2588         u32 group_allocated;
2589         int size = *offset;
2590         int n;
2591
2592         if (!len || size)
2593                 return 0;
2594
2595         size += sprintf(&buf[size], "H/ S ACTive      : [ 0x");
2596
2597         for (n = dd->slot_groups-1; n >= 0; n--)
2598                 size += sprintf(&buf[size], "%08X ",
2599                                          readl(dd->port->s_active[n]));
2600
2601         size += sprintf(&buf[size], "]\n");
2602         size += sprintf(&buf[size], "H/ Command Issue : [ 0x");
2603
2604         for (n = dd->slot_groups-1; n >= 0; n--)
2605                 size += sprintf(&buf[size], "%08X ",
2606                                         readl(dd->port->cmd_issue[n]));
2607
2608         size += sprintf(&buf[size], "]\n");
2609         size += sprintf(&buf[size], "H/ Completed     : [ 0x");
2610
2611         for (n = dd->slot_groups-1; n >= 0; n--)
2612                 size += sprintf(&buf[size], "%08X ",
2613                                 readl(dd->port->completed[n]));
2614
2615         size += sprintf(&buf[size], "]\n");
2616         size += sprintf(&buf[size], "H/ PORT IRQ STAT : [ 0x%08X ]\n",
2617                                 readl(dd->port->mmio + PORT_IRQ_STAT));
2618         size += sprintf(&buf[size], "H/ HOST IRQ STAT : [ 0x%08X ]\n",
2619                                 readl(dd->mmio + HOST_IRQ_STAT));
2620         size += sprintf(&buf[size], "\n");
2621
2622         size += sprintf(&buf[size], "L/ Allocated     : [ 0x");
2623
2624         for (n = dd->slot_groups-1; n >= 0; n--) {
2625                 if (sizeof(long) > sizeof(u32))
2626                         group_allocated =
2627                                 dd->port->allocated[n/2] >> (32*(n&1));
2628                 else
2629                         group_allocated = dd->port->allocated[n];
2630                 size += sprintf(&buf[size], "%08X ", group_allocated);
2631         }
2632         size += sprintf(&buf[size], "]\n");
2633
2634         size += sprintf(&buf[size], "L/ Commands in Q : [ 0x");
2635
2636         for (n = dd->slot_groups-1; n >= 0; n--) {
2637                 if (sizeof(long) > sizeof(u32))
2638                         group_allocated =
2639                                 dd->port->cmds_to_issue[n/2] >> (32*(n&1));
2640                 else
2641                         group_allocated = dd->port->cmds_to_issue[n];
2642                 size += sprintf(&buf[size], "%08X ", group_allocated);
2643         }
2644         size += sprintf(&buf[size], "]\n");
2645
2646         *offset = size <= len ? size : len;
2647         size = copy_to_user(ubuf, buf, *offset);
2648         if (size)
2649                 return -EFAULT;
2650
2651         return *offset;
2652 }
2653
2654 static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
2655                                   size_t len, loff_t *offset)
2656 {
2657         struct driver_data *dd =  (struct driver_data *)f->private_data;
2658         char buf[MTIP_DFS_MAX_BUF_SIZE];
2659         int size = *offset;
2660
2661         if (!len || size)
2662                 return 0;
2663
2664         size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
2665                                                         dd->port->flags);
2666         size += sprintf(&buf[size], "Flag-dd   : [ %08lX ]\n",
2667                                                         dd->dd_flag);
2668
2669         *offset = size <= len ? size : len;
2670         size = copy_to_user(ubuf, buf, *offset);
2671         if (size)
2672                 return -EFAULT;
2673
2674         return *offset;
2675 }
2676
2677 static const struct file_operations mtip_regs_fops = {
2678         .owner  = THIS_MODULE,
2679         .open   = simple_open,
2680         .read   = mtip_hw_read_registers,
2681         .llseek = no_llseek,
2682 };
2683
2684 static const struct file_operations mtip_flags_fops = {
2685         .owner  = THIS_MODULE,
2686         .open   = simple_open,
2687         .read   = mtip_hw_read_flags,
2688         .llseek = no_llseek,
2689 };
2690
2691 /*
2692  * Create the sysfs related attributes.
2693  *
2694  * @dd   Pointer to the driver data structure.
2695  * @kobj Pointer to the kobj for the block device.
2696  *
2697  * return value
2698  *      0       Operation completed successfully.
2699  *      -EINVAL Invalid parameter.
2700  */
2701 static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
2702 {
2703         if (!kobj || !dd)
2704                 return -EINVAL;
2705
2706         if (sysfs_create_file(kobj, &dev_attr_status.attr))
2707                 dev_warn(&dd->pdev->dev,
2708                         "Error creating 'status' sysfs entry\n");
2709         return 0;
2710 }
2711
2712 /*
2713  * Remove the sysfs related attributes.
2714  *
2715  * @dd   Pointer to the driver data structure.
2716  * @kobj Pointer to the kobj for the block device.
2717  *
2718  * return value
2719  *      0       Operation completed successfully.
2720  *      -EINVAL Invalid parameter.
2721  */
2722 static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
2723 {
2724         if (!kobj || !dd)
2725                 return -EINVAL;
2726
2727         sysfs_remove_file(kobj, &dev_attr_status.attr);
2728
2729         return 0;
2730 }
2731
2732 static int mtip_hw_debugfs_init(struct driver_data *dd)
2733 {
2734         if (!dfs_parent)
2735                 return -1;
2736
2737         dd->dfs_node = debugfs_create_dir(dd->disk->disk_name, dfs_parent);
2738         if (IS_ERR_OR_NULL(dd->dfs_node)) {
2739                 dev_warn(&dd->pdev->dev,
2740                         "Error creating node %s under debugfs\n",
2741                                                 dd->disk->disk_name);
2742                 dd->dfs_node = NULL;
2743                 return -1;
2744         }
2745
2746         debugfs_create_file("flags", S_IRUGO, dd->dfs_node, dd,
2747                                                         &mtip_flags_fops);
2748         debugfs_create_file("registers", S_IRUGO, dd->dfs_node, dd,
2749                                                         &mtip_regs_fops);
2750
2751         return 0;
2752 }
2753
2754 static void mtip_hw_debugfs_exit(struct driver_data *dd)
2755 {
2756         debugfs_remove_recursive(dd->dfs_node);
2757 }
2758
2759
2760 /*
2761  * Perform any init/resume time hardware setup
2762  *
2763  * @dd Pointer to the driver data structure.
2764  *
2765  * return value
2766  *      None
2767  */
2768 static inline void hba_setup(struct driver_data *dd)
2769 {
2770         u32 hwdata;
2771         hwdata = readl(dd->mmio + HOST_HSORG);
2772
2773         /* interrupt bug workaround: use only 1 IS bit.*/
2774         writel(hwdata |
2775                 HSORG_DISABLE_SLOTGRP_INTR |
2776                 HSORG_DISABLE_SLOTGRP_PXIS,
2777                 dd->mmio + HOST_HSORG);
2778 }
2779
2780 /*
2781  * Detect the details of the product, and store anything needed
2782  * into the driver data structure.  This includes product type and
2783  * version and number of slot groups.
2784  *
2785  * @dd Pointer to the driver data structure.
2786  *
2787  * return value
2788  *      None
2789  */
2790 static void mtip_detect_product(struct driver_data *dd)
2791 {
2792         u32 hwdata;
2793         unsigned int rev, slotgroups;
2794
2795         /*
2796          * HBA base + 0xFC [15:0] - vendor-specific hardware interface
2797          * info register:
2798          * [15:8] hardware/software interface rev#
2799          * [   3] asic-style interface
2800          * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
2801          */
2802         hwdata = readl(dd->mmio + HOST_HSORG);
2803
2804         dd->product_type = MTIP_PRODUCT_UNKNOWN;
2805         dd->slot_groups = 1;
2806
2807         if (hwdata & 0x8) {
2808                 dd->product_type = MTIP_PRODUCT_ASICFPGA;
2809                 rev = (hwdata & HSORG_HWREV) >> 8;
2810                 slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
2811                 dev_info(&dd->pdev->dev,
2812                         "ASIC-FPGA design, HS rev 0x%x, "
2813                         "%i slot groups [%i slots]\n",
2814                          rev,
2815                          slotgroups,
2816                          slotgroups * 32);
2817
2818                 if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
2819                         dev_warn(&dd->pdev->dev,
2820                                 "Warning: driver only supports "
2821                                 "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
2822                         slotgroups = MTIP_MAX_SLOT_GROUPS;
2823                 }
2824                 dd->slot_groups = slotgroups;
2825                 return;
2826         }
2827
2828         dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
2829 }
2830
2831 /*
2832  * Blocking wait for FTL rebuild to complete
2833  *
2834  * @dd Pointer to the DRIVER_DATA structure.
2835  *
2836  * return value
2837  *      0       FTL rebuild completed successfully
2838  *      -EFAULT FTL rebuild error/timeout/interruption
2839  */
2840 static int mtip_ftl_rebuild_poll(struct driver_data *dd)
2841 {
2842         unsigned long timeout, cnt = 0, start;
2843
2844         dev_warn(&dd->pdev->dev,
2845                 "FTL rebuild in progress. Polling for completion.\n");
2846
2847         start = jiffies;
2848         timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
2849
2850         do {
2851                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2852                                 &dd->dd_flag)))
2853                         return -EFAULT;
2854                 if (mtip_check_surprise_removal(dd->pdev))
2855                         return -EFAULT;
2856
2857                 if (mtip_get_identify(dd->port, NULL) < 0)
2858                         return -EFAULT;
2859
2860                 if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2861                         MTIP_FTL_REBUILD_MAGIC) {
2862                         ssleep(1);
2863                         /* Print message every 3 minutes */
2864                         if (cnt++ >= 180) {
2865                                 dev_warn(&dd->pdev->dev,
2866                                 "FTL rebuild in progress (%d secs).\n",
2867                                 jiffies_to_msecs(jiffies - start) / 1000);
2868                                 cnt = 0;
2869                         }
2870                 } else {
2871                         dev_warn(&dd->pdev->dev,
2872                                 "FTL rebuild complete (%d secs).\n",
2873                         jiffies_to_msecs(jiffies - start) / 1000);
2874                         mtip_block_initialize(dd);
2875                         return 0;
2876                 }
2877                 ssleep(10);
2878         } while (time_before(jiffies, timeout));
2879
2880         /* Check for timeout */
2881         dev_err(&dd->pdev->dev,
2882                 "Timed out waiting for FTL rebuild to complete (%d secs).\n",
2883                 jiffies_to_msecs(jiffies - start) / 1000);
2884         return -EFAULT;
2885 }
2886
2887 /*
2888  * service thread to issue queued commands
2889  *
2890  * @data Pointer to the driver data structure.
2891  *
2892  * return value
2893  *      0
2894  */
2895
2896 static int mtip_service_thread(void *data)
2897 {
2898         struct driver_data *dd = (struct driver_data *)data;
2899         unsigned long slot, slot_start, slot_wrap;
2900         unsigned int num_cmd_slots = dd->slot_groups * 32;
2901         struct mtip_port *port = dd->port;
2902
2903         while (1) {
2904                 /*
2905                  * the condition is to check neither an internal command is
2906                  * is in progress nor error handling is active
2907                  */
2908                 wait_event_interruptible(port->svc_wait, (port->flags) &&
2909                         !(port->flags & MTIP_PF_PAUSE_IO));
2910
2911                 if (kthread_should_stop())
2912                         break;
2913
2914                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2915                                 &dd->dd_flag)))
2916                         break;
2917
2918                 set_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2919                 if (test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
2920                         slot = 1;
2921                         /* used to restrict the loop to one iteration */
2922                         slot_start = num_cmd_slots;
2923                         slot_wrap = 0;
2924                         while (1) {
2925                                 slot = find_next_bit(port->cmds_to_issue,
2926                                                 num_cmd_slots, slot);
2927                                 if (slot_wrap == 1) {
2928                                         if ((slot_start >= slot) ||
2929                                                 (slot >= num_cmd_slots))
2930                                                 break;
2931                                 }
2932                                 if (unlikely(slot_start == num_cmd_slots))
2933                                         slot_start = slot;
2934
2935                                 if (unlikely(slot == num_cmd_slots)) {
2936                                         slot = 1;
2937                                         slot_wrap = 1;
2938                                         continue;
2939                                 }
2940
2941                                 /* Issue the command to the hardware */
2942                                 mtip_issue_ncq_command(port, slot);
2943
2944                                 clear_bit(slot, port->cmds_to_issue);
2945                         }
2946
2947                         clear_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2948                 } else if (test_bit(MTIP_PF_REBUILD_BIT, &port->flags)) {
2949                         if (!mtip_ftl_rebuild_poll(dd))
2950                                 set_bit(MTIP_DDF_REBUILD_FAILED_BIT,
2951                                                         &dd->dd_flag);
2952                         clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
2953                 }
2954                 clear_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2955
2956                 if (test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2957                         break;
2958         }
2959         return 0;
2960 }
2961
2962 /*
2963  * Called once for each card.
2964  *
2965  * @dd Pointer to the driver data structure.
2966  *
2967  * return value
2968  *      0 on success, else an error code.
2969  */
2970 static int mtip_hw_init(struct driver_data *dd)
2971 {
2972         int i;
2973         int rv;
2974         unsigned int num_command_slots;
2975         unsigned long timeout, timetaken;
2976         unsigned char *buf;
2977         struct smart_attr attr242;
2978
2979         dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
2980
2981         mtip_detect_product(dd);
2982         if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
2983                 rv = -EIO;
2984                 goto out1;
2985         }
2986         num_command_slots = dd->slot_groups * 32;
2987
2988         hba_setup(dd);
2989
2990         tasklet_init(&dd->tasklet, mtip_tasklet, (unsigned long)dd);
2991
2992         dd->port = kzalloc(sizeof(struct mtip_port), GFP_KERNEL);
2993         if (!dd->port) {
2994                 dev_err(&dd->pdev->dev,
2995                         "Memory allocation: port structure\n");
2996                 return -ENOMEM;
2997         }
2998
2999         /* Counting semaphore to track command slot usage */
3000         sema_init(&dd->port->cmd_slot, num_command_slots - 1);
3001
3002         /* Spinlock to prevent concurrent issue */
3003         spin_lock_init(&dd->port->cmd_issue_lock);
3004
3005         /* Set the port mmio base address. */
3006         dd->port->mmio  = dd->mmio + PORT_OFFSET;
3007         dd->port->dd    = dd;
3008
3009         /* Allocate memory for the command list. */
3010         dd->port->command_list =
3011                 dmam_alloc_coherent(&dd->pdev->dev,
3012                         HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3013                         &dd->port->command_list_dma,
3014                         GFP_KERNEL);
3015         if (!dd->port->command_list) {
3016                 dev_err(&dd->pdev->dev,
3017                         "Memory allocation: command list\n");
3018                 rv = -ENOMEM;
3019                 goto out1;
3020         }
3021
3022         /* Clear the memory we have allocated. */
3023         memset(dd->port->command_list,
3024                 0,
3025                 HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4));
3026
3027         /* Setup the addresse of the RX FIS. */
3028         dd->port->rxfis     = dd->port->command_list + HW_CMD_SLOT_SZ;
3029         dd->port->rxfis_dma = dd->port->command_list_dma + HW_CMD_SLOT_SZ;
3030
3031         /* Setup the address of the command tables. */
3032         dd->port->command_table   = dd->port->rxfis + AHCI_RX_FIS_SZ;
3033         dd->port->command_tbl_dma = dd->port->rxfis_dma + AHCI_RX_FIS_SZ;
3034
3035         /* Setup the address of the identify data. */
3036         dd->port->identify     = dd->port->command_table +
3037                                         HW_CMD_TBL_AR_SZ;
3038         dd->port->identify_dma = dd->port->command_tbl_dma +
3039                                         HW_CMD_TBL_AR_SZ;
3040
3041         /* Setup the address of the sector buffer - for some non-ncq cmds */
3042         dd->port->sector_buffer = (void *) dd->port->identify + ATA_SECT_SIZE;
3043         dd->port->sector_buffer_dma = dd->port->identify_dma + ATA_SECT_SIZE;
3044
3045         /* Setup the address of the log buf - for read log command */
3046         dd->port->log_buf = (void *)dd->port->sector_buffer  + ATA_SECT_SIZE;
3047         dd->port->log_buf_dma = dd->port->sector_buffer_dma + ATA_SECT_SIZE;
3048
3049         /* Setup the address of the smart buf - for smart read data command */
3050         dd->port->smart_buf = (void *)dd->port->log_buf  + ATA_SECT_SIZE;
3051         dd->port->smart_buf_dma = dd->port->log_buf_dma + ATA_SECT_SIZE;
3052
3053
3054         /* Point the command headers at the command tables. */
3055         for (i = 0; i < num_command_slots; i++) {
3056                 dd->port->commands[i].command_header =
3057                                         dd->port->command_list +
3058                                         (sizeof(struct mtip_cmd_hdr) * i);
3059                 dd->port->commands[i].command_header_dma =
3060                                         dd->port->command_list_dma +
3061                                         (sizeof(struct mtip_cmd_hdr) * i);
3062
3063                 dd->port->commands[i].command =
3064                         dd->port->command_table + (HW_CMD_TBL_SZ * i);
3065                 dd->port->commands[i].command_dma =
3066                         dd->port->command_tbl_dma + (HW_CMD_TBL_SZ * i);
3067
3068                 if (readl(dd->mmio + HOST_CAP) & HOST_CAP_64)
3069                         dd->port->commands[i].command_header->ctbau =
3070                         __force_bit2int cpu_to_le32(
3071                         (dd->port->commands[i].command_dma >> 16) >> 16);
3072                 dd->port->commands[i].command_header->ctba =
3073                         __force_bit2int cpu_to_le32(
3074                         dd->port->commands[i].command_dma & 0xFFFFFFFF);
3075
3076                 /*
3077                  * If this is not done, a bug is reported by the stock
3078                  * FC11 i386. Due to the fact that it has lots of kernel
3079                  * debugging enabled.
3080                  */
3081                 sg_init_table(dd->port->commands[i].sg, MTIP_MAX_SG);
3082
3083                 /* Mark all commands as currently inactive.*/
3084                 atomic_set(&dd->port->commands[i].active, 0);
3085         }
3086
3087         /* Setup the pointers to the extended s_active and CI registers. */
3088         for (i = 0; i < dd->slot_groups; i++) {
3089                 dd->port->s_active[i] =
3090                         dd->port->mmio + i*0x80 + PORT_SCR_ACT;
3091                 dd->port->cmd_issue[i] =
3092                         dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
3093                 dd->port->completed[i] =
3094                         dd->port->mmio + i*0x80 + PORT_SDBV;
3095         }
3096
3097         timetaken = jiffies;
3098         timeout = jiffies + msecs_to_jiffies(30000);
3099         while (((readl(dd->port->mmio + PORT_SCR_STAT) & 0x0F) != 0x03) &&
3100                  time_before(jiffies, timeout)) {
3101                 mdelay(100);
3102         }
3103         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
3104                 timetaken = jiffies - timetaken;
3105                 dev_warn(&dd->pdev->dev,
3106                         "Surprise removal detected at %u ms\n",
3107                         jiffies_to_msecs(timetaken));
3108                 rv = -ENODEV;
3109                 goto out2 ;
3110         }
3111         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
3112                 timetaken = jiffies - timetaken;
3113                 dev_warn(&dd->pdev->dev,
3114                         "Removal detected at %u ms\n",
3115                         jiffies_to_msecs(timetaken));
3116                 rv = -EFAULT;
3117                 goto out2;
3118         }
3119
3120         /* Conditionally reset the HBA. */
3121         if (!(readl(dd->mmio + HOST_CAP) & HOST_CAP_NZDMA)) {
3122                 if (mtip_hba_reset(dd) < 0) {
3123                         dev_err(&dd->pdev->dev,
3124                                 "Card did not reset within timeout\n");
3125                         rv = -EIO;
3126                         goto out2;
3127                 }
3128         } else {
3129                 /* Clear any pending interrupts on the HBA */
3130                 writel(readl(dd->mmio + HOST_IRQ_STAT),
3131                         dd->mmio + HOST_IRQ_STAT);
3132         }
3133
3134         mtip_init_port(dd->port);
3135         mtip_start_port(dd->port);
3136
3137         /* Setup the ISR and enable interrupts. */
3138         rv = devm_request_irq(&dd->pdev->dev,
3139                                 dd->pdev->irq,
3140                                 mtip_irq_handler,
3141                                 IRQF_SHARED,
3142                                 dev_driver_string(&dd->pdev->dev),
3143                                 dd);
3144
3145         if (rv) {
3146                 dev_err(&dd->pdev->dev,
3147                         "Unable to allocate IRQ %d\n", dd->pdev->irq);
3148                 goto out2;
3149         }
3150
3151         /* Enable interrupts on the HBA. */
3152         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3153                                         dd->mmio + HOST_CTL);
3154
3155         init_timer(&dd->port->cmd_timer);
3156         init_waitqueue_head(&dd->port->svc_wait);
3157
3158         dd->port->cmd_timer.data = (unsigned long int) dd->port;
3159         dd->port->cmd_timer.function = mtip_timeout_function;
3160         mod_timer(&dd->port->cmd_timer,
3161                 jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
3162
3163
3164         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
3165                 rv = -EFAULT;
3166                 goto out3;
3167         }
3168
3169         if (mtip_get_identify(dd->port, NULL) < 0) {
3170                 rv = -EFAULT;
3171                 goto out3;
3172         }
3173
3174         if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
3175                 MTIP_FTL_REBUILD_MAGIC) {
3176                 set_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags);
3177                 return MTIP_FTL_REBUILD_MAGIC;
3178         }
3179         mtip_dump_identify(dd->port);
3180
3181         /* check write protect, over temp and rebuild statuses */
3182         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
3183                                 dd->port->log_buf,
3184                                 dd->port->log_buf_dma, 1);
3185         if (rv) {
3186                 dev_warn(&dd->pdev->dev,
3187                         "Error in READ LOG EXT (10h) command\n");
3188                 /* non-critical error, don't fail the load */
3189         } else {
3190                 buf = (unsigned char *)dd->port->log_buf;
3191                 if (buf[259] & 0x1) {
3192                         dev_info(&dd->pdev->dev,
3193                                 "Write protect bit is set.\n");
3194                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
3195                 }
3196                 if (buf[288] == 0xF7) {
3197                         dev_info(&dd->pdev->dev,
3198                                 "Exceeded Tmax, drive in thermal shutdown.\n");
3199                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
3200                 }
3201                 if (buf[288] == 0xBF) {
3202                         dev_info(&dd->pdev->dev,
3203                                 "Drive indicates rebuild has failed.\n");
3204                         /* TODO */
3205                 }
3206         }
3207
3208         /* get write protect progess */
3209         memset(&attr242, 0, sizeof(struct smart_attr));
3210         if (mtip_get_smart_attr(dd->port, 242, &attr242))
3211                 dev_warn(&dd->pdev->dev,
3212                                 "Unable to check write protect progress\n");
3213         else
3214                 dev_info(&dd->pdev->dev,
3215                                 "Write protect progress: %u%% (%u blocks)\n",
3216                                 attr242.cur, le32_to_cpu(attr242.data));
3217         return rv;
3218
3219 out3:
3220         del_timer_sync(&dd->port->cmd_timer);
3221
3222         /* Disable interrupts on the HBA. */
3223         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3224                         dd->mmio + HOST_CTL);
3225
3226         /*Release the IRQ. */
3227         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3228
3229 out2:
3230         mtip_deinit_port(dd->port);
3231
3232         /* Free the command/command header memory. */
3233         dmam_free_coherent(&dd->pdev->dev,
3234                                 HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3235                                 dd->port->command_list,
3236                                 dd->port->command_list_dma);
3237 out1:
3238         /* Free the memory allocated for the for structure. */
3239         kfree(dd->port);
3240
3241         return rv;
3242 }
3243
3244 /*
3245  * Called to deinitialize an interface.
3246  *
3247  * @dd Pointer to the driver data structure.
3248  *
3249  * return value
3250  *      0
3251  */
3252 static int mtip_hw_exit(struct driver_data *dd)
3253 {
3254         /*
3255          * Send standby immediate (E0h) to the drive so that it
3256          * saves its state.
3257          */
3258         if (!test_bit(MTIP_DDF_CLEANUP_BIT, &dd->dd_flag)) {
3259
3260                 if (!test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags))
3261                         if (mtip_standby_immediate(dd->port))
3262                                 dev_warn(&dd->pdev->dev,
3263                                         "STANDBY IMMEDIATE failed\n");
3264
3265                 /* de-initialize the port. */
3266                 mtip_deinit_port(dd->port);
3267
3268                 /* Disable interrupts on the HBA. */
3269                 writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3270                                 dd->mmio + HOST_CTL);
3271         }
3272
3273         del_timer_sync(&dd->port->cmd_timer);
3274
3275         /* Release the IRQ. */
3276         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3277
3278         /* Stop the bottom half tasklet. */
3279         tasklet_kill(&dd->tasklet);
3280
3281         /* Free the command/command header memory. */
3282         dmam_free_coherent(&dd->pdev->dev,
3283                         HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3284                         dd->port->command_list,
3285                         dd->port->command_list_dma);
3286         /* Free the memory allocated for the for structure. */
3287         kfree(dd->port);
3288
3289         return 0;
3290 }
3291
3292 /*
3293  * Issue a Standby Immediate command to the device.
3294  *
3295  * This function is called by the Block Layer just before the
3296  * system powers off during a shutdown.
3297  *
3298  * @dd Pointer to the driver data structure.
3299  *
3300  * return value
3301  *      0
3302  */
3303 static int mtip_hw_shutdown(struct driver_data *dd)
3304 {
3305         /*
3306          * Send standby immediate (E0h) to the drive so that it
3307          * saves its state.
3308          */
3309         mtip_standby_immediate(dd->port);
3310
3311         return 0;
3312 }
3313
3314 /*
3315  * Suspend function
3316  *
3317  * This function is called by the Block Layer just before the
3318  * system hibernates.
3319  *
3320  * @dd Pointer to the driver data structure.
3321  *
3322  * return value
3323  *      0       Suspend was successful
3324  *      -EFAULT Suspend was not successful
3325  */
3326 static int mtip_hw_suspend(struct driver_data *dd)
3327 {
3328         /*
3329          * Send standby immediate (E0h) to the drive
3330          * so that it saves its state.
3331          */
3332         if (mtip_standby_immediate(dd->port) != 0) {
3333                 dev_err(&dd->pdev->dev,
3334                         "Failed standby-immediate command\n");
3335                 return -EFAULT;
3336         }
3337
3338         /* Disable interrupts on the HBA.*/
3339         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3340                         dd->mmio + HOST_CTL);
3341         mtip_deinit_port(dd->port);
3342
3343         return 0;
3344 }
3345
3346 /*
3347  * Resume function
3348  *
3349  * This function is called by the Block Layer as the
3350  * system resumes.
3351  *
3352  * @dd Pointer to the driver data structure.
3353  *
3354  * return value
3355  *      0       Resume was successful
3356  *      -EFAULT Resume was not successful
3357  */
3358 static int mtip_hw_resume(struct driver_data *dd)
3359 {
3360         /* Perform any needed hardware setup steps */
3361         hba_setup(dd);
3362
3363         /* Reset the HBA */
3364         if (mtip_hba_reset(dd) != 0) {
3365                 dev_err(&dd->pdev->dev,
3366                         "Unable to reset the HBA\n");
3367                 return -EFAULT;
3368         }
3369
3370         /*
3371          * Enable the port, DMA engine, and FIS reception specific
3372          * h/w in controller.
3373          */
3374         mtip_init_port(dd->port);
3375         mtip_start_port(dd->port);
3376
3377         /* Enable interrupts on the HBA.*/
3378         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3379                         dd->mmio + HOST_CTL);
3380
3381         return 0;
3382 }
3383
3384 /*
3385  * Helper function for reusing disk name
3386  * upon hot insertion.
3387  */
3388 static int rssd_disk_name_format(char *prefix,
3389                                  int index,
3390                                  char *buf,
3391                                  int buflen)
3392 {
3393         const int base = 'z' - 'a' + 1;
3394         char *begin = buf + strlen(prefix);
3395         char *end = buf + buflen;
3396         char *p;
3397         int unit;
3398
3399         p = end - 1;
3400         *p = '\0';
3401         unit = base;
3402         do {
3403                 if (p == begin)
3404                         return -EINVAL;
3405                 *--p = 'a' + (index % unit);
3406                 index = (index / unit) - 1;
3407         } while (index >= 0);
3408
3409         memmove(begin, p, end - p);
3410         memcpy(buf, prefix, strlen(prefix));
3411
3412         return 0;
3413 }
3414
3415 /*
3416  * Block layer IOCTL handler.
3417  *
3418  * @dev Pointer to the block_device structure.
3419  * @mode ignored
3420  * @cmd IOCTL command passed from the user application.
3421  * @arg Argument passed from the user application.
3422  *
3423  * return value
3424  *      0        IOCTL completed successfully.
3425  *      -ENOTTY  IOCTL not supported or invalid driver data
3426  *                 structure pointer.
3427  */
3428 static int mtip_block_ioctl(struct block_device *dev,
3429                             fmode_t mode,
3430                             unsigned cmd,
3431                             unsigned long arg)
3432 {
3433         struct driver_data *dd = dev->bd_disk->private_data;
3434
3435         if (!capable(CAP_SYS_ADMIN))
3436                 return -EACCES;
3437
3438         if (!dd)
3439                 return -ENOTTY;
3440
3441         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3442                 return -ENOTTY;
3443
3444         switch (cmd) {
3445         case BLKFLSBUF:
3446                 return -ENOTTY;
3447         default:
3448                 return mtip_hw_ioctl(dd, cmd, arg);
3449         }
3450 }
3451
3452 #ifdef CONFIG_COMPAT
3453 /*
3454  * Block layer compat IOCTL handler.
3455  *
3456  * @dev Pointer to the block_device structure.
3457  * @mode ignored
3458  * @cmd IOCTL command passed from the user application.
3459  * @arg Argument passed from the user application.
3460  *
3461  * return value
3462  *      0        IOCTL completed successfully.
3463  *      -ENOTTY  IOCTL not supported or invalid driver data
3464  *                 structure pointer.
3465  */
3466 static int mtip_block_compat_ioctl(struct block_device *dev,
3467                             fmode_t mode,
3468                             unsigned cmd,
3469                             unsigned long arg)
3470 {
3471         struct driver_data *dd = dev->bd_disk->private_data;
3472
3473         if (!capable(CAP_SYS_ADMIN))
3474                 return -EACCES;
3475
3476         if (!dd)
3477                 return -ENOTTY;
3478
3479         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3480                 return -ENOTTY;
3481
3482         switch (cmd) {
3483         case BLKFLSBUF:
3484                 return -ENOTTY;
3485         case HDIO_DRIVE_TASKFILE: {
3486                 struct mtip_compat_ide_task_request_s __user *compat_req_task;
3487                 ide_task_request_t req_task;
3488                 int compat_tasksize, outtotal, ret;
3489
3490                 compat_tasksize =
3491                         sizeof(struct mtip_compat_ide_task_request_s);
3492
3493                 compat_req_task =
3494                         (struct mtip_compat_ide_task_request_s __user *) arg;
3495
3496                 if (copy_from_user(&req_task, (void __user *) arg,
3497                         compat_tasksize - (2 * sizeof(compat_long_t))))
3498                         return -EFAULT;
3499
3500                 if (get_user(req_task.out_size, &compat_req_task->out_size))
3501                         return -EFAULT;
3502
3503                 if (get_user(req_task.in_size, &compat_req_task->in_size))
3504                         return -EFAULT;
3505
3506                 outtotal = sizeof(struct mtip_compat_ide_task_request_s);
3507
3508                 ret = exec_drive_taskfile(dd, (void __user *) arg,
3509                                                 &req_task, outtotal);
3510
3511                 if (copy_to_user((void __user *) arg, &req_task,
3512                                 compat_tasksize -
3513                                 (2 * sizeof(compat_long_t))))
3514                         return -EFAULT;
3515
3516                 if (put_user(req_task.out_size, &compat_req_task->out_size))
3517                         return -EFAULT;
3518
3519                 if (put_user(req_task.in_size, &compat_req_task->in_size))
3520                         return -EFAULT;
3521
3522                 return ret;
3523         }
3524         default:
3525                 return mtip_hw_ioctl(dd, cmd, arg);
3526         }
3527 }
3528 #endif
3529
3530 /*
3531  * Obtain the geometry of the device.
3532  *
3533  * You may think that this function is obsolete, but some applications,
3534  * fdisk for example still used CHS values. This function describes the
3535  * device as having 224 heads and 56 sectors per cylinder. These values are
3536  * chosen so that each cylinder is aligned on a 4KB boundary. Since a
3537  * partition is described in terms of a start and end cylinder this means
3538  * that each partition is also 4KB aligned. Non-aligned partitions adversely
3539  * affects performance.
3540  *
3541  * @dev Pointer to the block_device strucutre.
3542  * @geo Pointer to a hd_geometry structure.
3543  *
3544  * return value
3545  *      0       Operation completed successfully.
3546  *      -ENOTTY An error occurred while reading the drive capacity.
3547  */
3548 static int mtip_block_getgeo(struct block_device *dev,
3549                                 struct hd_geometry *geo)
3550 {
3551         struct driver_data *dd = dev->bd_disk->private_data;
3552         sector_t capacity;
3553
3554         if (!dd)
3555                 return -ENOTTY;
3556
3557         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3558                 dev_warn(&dd->pdev->dev,
3559                         "Could not get drive capacity.\n");
3560                 return -ENOTTY;
3561         }
3562
3563         geo->heads = 224;
3564         geo->sectors = 56;
3565         sector_div(capacity, (geo->heads * geo->sectors));
3566         geo->cylinders = capacity;
3567         return 0;
3568 }
3569
3570 /*
3571  * Block device operation function.
3572  *
3573  * This structure contains pointers to the functions required by the block
3574  * layer.
3575  */
3576 static const struct block_device_operations mtip_block_ops = {
3577         .ioctl          = mtip_block_ioctl,
3578 #ifdef CONFIG_COMPAT
3579         .compat_ioctl   = mtip_block_compat_ioctl,
3580 #endif
3581         .getgeo         = mtip_block_getgeo,
3582         .owner          = THIS_MODULE
3583 };
3584
3585 /*
3586  * Block layer make request function.
3587  *
3588  * This function is called by the kernel to process a BIO for
3589  * the P320 device.
3590  *
3591  * @queue Pointer to the request queue. Unused other than to obtain
3592  *              the driver data structure.
3593  * @bio   Pointer to the BIO.
3594  *
3595  */
3596 static void mtip_make_request(struct request_queue *queue, struct bio *bio)
3597 {
3598         struct driver_data *dd = queue->queuedata;
3599         struct scatterlist *sg;
3600         struct bio_vec *bvec;
3601         int nents = 0;
3602         int tag = 0;
3603
3604         if (unlikely(dd->dd_flag & MTIP_DDF_STOP_IO)) {
3605                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
3606                                                         &dd->dd_flag))) {
3607                         bio_endio(bio, -ENXIO);
3608                         return;
3609                 }
3610                 if (unlikely(test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))) {
3611                         bio_endio(bio, -ENODATA);
3612                         return;
3613                 }
3614                 if (unlikely(test_bit(MTIP_DDF_WRITE_PROTECT_BIT,
3615                                                         &dd->dd_flag) &&
3616                                 bio_data_dir(bio))) {
3617                         bio_endio(bio, -ENODATA);
3618                         return;
3619                 }
3620                 if (unlikely(test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag))) {
3621                         bio_endio(bio, -ENODATA);
3622                         return;
3623                 }
3624         }
3625
3626         if (unlikely(!bio_has_data(bio))) {
3627                 blk_queue_flush(queue, 0);
3628                 bio_endio(bio, 0);
3629                 return;
3630         }
3631
3632         sg = mtip_hw_get_scatterlist(dd, &tag);
3633         if (likely(sg != NULL)) {
3634                 blk_queue_bounce(queue, &bio);
3635
3636                 if (unlikely((bio)->bi_vcnt > MTIP_MAX_SG)) {
3637                         dev_warn(&dd->pdev->dev,
3638                                 "Maximum number of SGL entries exceeded\n");
3639                         bio_io_error(bio);
3640                         mtip_hw_release_scatterlist(dd, tag);
3641                         return;
3642                 }
3643
3644                 /* Create the scatter list for this bio. */
3645                 bio_for_each_segment(bvec, bio, nents) {
3646                         sg_set_page(&sg[nents],
3647                                         bvec->bv_page,
3648                                         bvec->bv_len,
3649                                         bvec->bv_offset);
3650                 }
3651
3652                 /* Issue the read/write. */
3653                 mtip_hw_submit_io(dd,
3654                                 bio->bi_sector,
3655                                 bio_sectors(bio),
3656                                 nents,
3657                                 tag,
3658                                 bio_endio,
3659                                 bio,
3660                                 bio_data_dir(bio));
3661         } else
3662                 bio_io_error(bio);
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         unsigned char thd_name[16];
3683
3684         if (dd->disk)
3685                 goto skip_create_disk; /* hw init done, before rebuild */
3686
3687         /* Initialize the protocol layer. */
3688         wait_for_rebuild = mtip_hw_init(dd);
3689         if (wait_for_rebuild < 0) {
3690                 dev_err(&dd->pdev->dev,
3691                         "Protocol layer initialization failed\n");
3692                 rv = -EINVAL;
3693                 goto protocol_init_error;
3694         }
3695
3696         dd->disk = alloc_disk(MTIP_MAX_MINORS);
3697         if (dd->disk  == NULL) {
3698                 dev_err(&dd->pdev->dev,
3699                         "Unable to allocate gendisk structure\n");
3700                 rv = -EINVAL;
3701                 goto alloc_disk_error;
3702         }
3703
3704         /* Generate the disk name, implemented same as in sd.c */
3705         do {
3706                 if (!ida_pre_get(&rssd_index_ida, GFP_KERNEL))
3707                         goto ida_get_error;
3708
3709                 spin_lock(&rssd_index_lock);
3710                 rv = ida_get_new(&rssd_index_ida, &index);
3711                 spin_unlock(&rssd_index_lock);
3712         } while (rv == -EAGAIN);
3713
3714         if (rv)
3715                 goto ida_get_error;
3716
3717         rv = rssd_disk_name_format("rssd",
3718                                 index,
3719                                 dd->disk->disk_name,
3720                                 DISK_NAME_LEN);
3721         if (rv)
3722                 goto disk_index_error;
3723
3724         dd->disk->driverfs_dev  = &dd->pdev->dev;
3725         dd->disk->major         = dd->major;
3726         dd->disk->first_minor   = dd->instance * MTIP_MAX_MINORS;
3727         dd->disk->fops          = &mtip_block_ops;
3728         dd->disk->private_data  = dd;
3729         dd->index               = index;
3730
3731         /*
3732          * if rebuild pending, start the service thread, and delay the block
3733          * queue creation and add_disk()
3734          */
3735         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3736                 goto start_service_thread;
3737
3738 skip_create_disk:
3739         /* Allocate the request queue. */
3740         dd->queue = blk_alloc_queue(GFP_KERNEL);
3741         if (dd->queue == NULL) {
3742                 dev_err(&dd->pdev->dev,
3743                         "Unable to allocate request queue\n");
3744                 rv = -ENOMEM;
3745                 goto block_queue_alloc_init_error;
3746         }
3747
3748         /* Attach our request function to the request queue. */
3749         blk_queue_make_request(dd->queue, mtip_make_request);
3750
3751         dd->disk->queue         = dd->queue;
3752         dd->queue->queuedata    = dd;
3753
3754         /* Set device limits. */
3755         set_bit(QUEUE_FLAG_NONROT, &dd->queue->queue_flags);
3756         blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
3757         blk_queue_physical_block_size(dd->queue, 4096);
3758         blk_queue_max_hw_sectors(dd->queue, 0xffff);
3759         blk_queue_max_segment_size(dd->queue, 0x400000);
3760         blk_queue_io_min(dd->queue, 4096);
3761
3762         /*
3763          * write back cache is not supported in the device. FUA depends on
3764          * write back cache support, hence setting flush support to zero.
3765          */
3766         blk_queue_flush(dd->queue, 0);
3767
3768         /* Set the capacity of the device in 512 byte sectors. */
3769         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3770                 dev_warn(&dd->pdev->dev,
3771                         "Could not read drive capacity\n");
3772                 rv = -EIO;
3773                 goto read_capacity_error;
3774         }
3775         set_capacity(dd->disk, capacity);
3776
3777         /* Enable the block device and add it to /dev */
3778         add_disk(dd->disk);
3779
3780         /*
3781          * Now that the disk is active, initialize any sysfs attributes
3782          * managed by the protocol layer.
3783          */
3784         kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
3785         if (kobj) {
3786                 mtip_hw_sysfs_init(dd, kobj);
3787                 kobject_put(kobj);
3788         }
3789         mtip_hw_debugfs_init(dd);
3790
3791         if (dd->mtip_svc_handler) {
3792                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
3793                 return rv; /* service thread created for handling rebuild */
3794         }
3795
3796 start_service_thread:
3797         sprintf(thd_name, "mtip_svc_thd_%02d", index);
3798
3799         dd->mtip_svc_handler = kthread_run(mtip_service_thread,
3800                                                 dd, thd_name);
3801
3802         if (IS_ERR(dd->mtip_svc_handler)) {
3803                 dev_err(&dd->pdev->dev, "service thread failed to start\n");
3804                 dd->mtip_svc_handler = NULL;
3805                 rv = -EFAULT;
3806                 goto kthread_run_error;
3807         }
3808
3809         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3810                 rv = wait_for_rebuild;
3811
3812         return rv;
3813
3814 kthread_run_error:
3815         mtip_hw_debugfs_exit(dd);
3816
3817         /* Delete our gendisk. This also removes the device from /dev */
3818         del_gendisk(dd->disk);
3819
3820 read_capacity_error:
3821         blk_cleanup_queue(dd->queue);
3822
3823 block_queue_alloc_init_error:
3824 disk_index_error:
3825         spin_lock(&rssd_index_lock);
3826         ida_remove(&rssd_index_ida, index);
3827         spin_unlock(&rssd_index_lock);
3828
3829 ida_get_error:
3830         put_disk(dd->disk);
3831
3832 alloc_disk_error:
3833         mtip_hw_exit(dd); /* De-initialize the protocol layer. */
3834
3835 protocol_init_error:
3836         return rv;
3837 }
3838
3839 /*
3840  * Block layer deinitialization function.
3841  *
3842  * Called by the PCI layer as each P320 device is removed.
3843  *
3844  * @dd Pointer to the driver data structure.
3845  *
3846  * return value
3847  *      0
3848  */
3849 static int mtip_block_remove(struct driver_data *dd)
3850 {
3851         struct kobject *kobj;
3852
3853         if (dd->mtip_svc_handler) {
3854                 set_bit(MTIP_PF_SVC_THD_STOP_BIT, &dd->port->flags);
3855                 wake_up_interruptible(&dd->port->svc_wait);
3856                 kthread_stop(dd->mtip_svc_handler);
3857         }
3858
3859         /* Clean up the sysfs attributes, if created */
3860         if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag)) {
3861                 kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
3862                 if (kobj) {
3863                         mtip_hw_sysfs_exit(dd, kobj);
3864                         kobject_put(kobj);
3865                 }
3866         }
3867         mtip_hw_debugfs_exit(dd);
3868
3869         /*
3870          * Delete our gendisk structure. This also removes the device
3871          * from /dev
3872          */
3873         del_gendisk(dd->disk);
3874
3875         spin_lock(&rssd_index_lock);
3876         ida_remove(&rssd_index_ida, dd->index);
3877         spin_unlock(&rssd_index_lock);
3878
3879         blk_cleanup_queue(dd->queue);
3880         dd->disk  = NULL;
3881         dd->queue = NULL;
3882
3883         /* De-initialize the protocol layer. */
3884         mtip_hw_exit(dd);
3885
3886         return 0;
3887 }
3888
3889 /*
3890  * Function called by the PCI layer when just before the
3891  * machine shuts down.
3892  *
3893  * If a protocol layer shutdown function is present it will be called
3894  * by this function.
3895  *
3896  * @dd Pointer to the driver data structure.
3897  *
3898  * return value
3899  *      0
3900  */
3901 static int mtip_block_shutdown(struct driver_data *dd)
3902 {
3903         dev_info(&dd->pdev->dev,
3904                 "Shutting down %s ...\n", dd->disk->disk_name);
3905
3906         /* Delete our gendisk structure, and cleanup the blk queue. */
3907         del_gendisk(dd->disk);
3908
3909         spin_lock(&rssd_index_lock);
3910         ida_remove(&rssd_index_ida, dd->index);
3911         spin_unlock(&rssd_index_lock);
3912
3913         blk_cleanup_queue(dd->queue);
3914         dd->disk  = NULL;
3915         dd->queue = NULL;
3916
3917         mtip_hw_shutdown(dd);
3918         return 0;
3919 }
3920
3921 static int mtip_block_suspend(struct driver_data *dd)
3922 {
3923         dev_info(&dd->pdev->dev,
3924                 "Suspending %s ...\n", dd->disk->disk_name);
3925         mtip_hw_suspend(dd);
3926         return 0;
3927 }
3928
3929 static int mtip_block_resume(struct driver_data *dd)
3930 {
3931         dev_info(&dd->pdev->dev, "Resuming %s ...\n",
3932                 dd->disk->disk_name);
3933         mtip_hw_resume(dd);
3934         return 0;
3935 }
3936
3937 /*
3938  * Called for each supported PCI device detected.
3939  *
3940  * This function allocates the private data structure, enables the
3941  * PCI device and then calls the block layer initialization function.
3942  *
3943  * return value
3944  *      0 on success else an error code.
3945  */
3946 static int mtip_pci_probe(struct pci_dev *pdev,
3947                         const struct pci_device_id *ent)
3948 {
3949         int rv = 0;
3950         struct driver_data *dd = NULL;
3951
3952         /* Allocate memory for this devices private data. */
3953         dd = kzalloc(sizeof(struct driver_data), GFP_KERNEL);
3954         if (dd == NULL) {
3955                 dev_err(&pdev->dev,
3956                         "Unable to allocate memory for driver data\n");
3957                 return -ENOMEM;
3958         }
3959
3960         /* Attach the private data to this PCI device.  */
3961         pci_set_drvdata(pdev, dd);
3962
3963         rv = pcim_enable_device(pdev);
3964         if (rv < 0) {
3965                 dev_err(&pdev->dev, "Unable to enable device\n");
3966                 goto iomap_err;
3967         }
3968
3969         /* Map BAR5 to memory. */
3970         rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME);
3971         if (rv < 0) {
3972                 dev_err(&pdev->dev, "Unable to map regions\n");
3973                 goto iomap_err;
3974         }
3975
3976         if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
3977                 rv = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
3978
3979                 if (rv) {
3980                         rv = pci_set_consistent_dma_mask(pdev,
3981                                                 DMA_BIT_MASK(32));
3982                         if (rv) {
3983                                 dev_warn(&pdev->dev,
3984                                         "64-bit DMA enable failed\n");
3985                                 goto setmask_err;
3986                         }
3987                 }
3988         }
3989
3990         pci_set_master(pdev);
3991
3992         if (pci_enable_msi(pdev)) {
3993                 dev_warn(&pdev->dev,
3994                         "Unable to enable MSI interrupt.\n");
3995                 goto block_initialize_err;
3996         }
3997
3998         /* Copy the info we may need later into the private data structure. */
3999         dd->major       = mtip_major;
4000         dd->instance    = instance;
4001         dd->pdev        = pdev;
4002
4003         /* Initialize the block layer. */
4004         rv = mtip_block_initialize(dd);
4005         if (rv < 0) {
4006                 dev_err(&pdev->dev,
4007                         "Unable to initialize block layer\n");
4008                 goto block_initialize_err;
4009         }
4010
4011         /*
4012          * Increment the instance count so that each device has a unique
4013          * instance number.
4014          */
4015         instance++;
4016         if (rv != MTIP_FTL_REBUILD_MAGIC)
4017                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4018         goto done;
4019
4020 block_initialize_err:
4021         pci_disable_msi(pdev);
4022
4023 setmask_err:
4024         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4025
4026 iomap_err:
4027         kfree(dd);
4028         pci_set_drvdata(pdev, NULL);
4029         return rv;
4030 done:
4031         return rv;
4032 }
4033
4034 /*
4035  * Called for each probed device when the device is removed or the
4036  * driver is unloaded.
4037  *
4038  * return value
4039  *      None
4040  */
4041 static void mtip_pci_remove(struct pci_dev *pdev)
4042 {
4043         struct driver_data *dd = pci_get_drvdata(pdev);
4044         int counter = 0;
4045
4046         set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
4047
4048         if (mtip_check_surprise_removal(pdev)) {
4049                 while (!test_bit(MTIP_DDF_CLEANUP_BIT, &dd->dd_flag)) {
4050                         counter++;
4051                         msleep(20);
4052                         if (counter == 10) {
4053                                 /* Cleanup the outstanding commands */
4054                                 mtip_command_cleanup(dd);
4055                                 break;
4056                         }
4057                 }
4058         }
4059
4060         /* Clean up the block layer. */
4061         mtip_block_remove(dd);
4062
4063         pci_disable_msi(pdev);
4064
4065         kfree(dd);
4066         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4067 }
4068
4069 /*
4070  * Called for each probed device when the device is suspended.
4071  *
4072  * return value
4073  *      0  Success
4074  *      <0 Error
4075  */
4076 static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
4077 {
4078         int rv = 0;
4079         struct driver_data *dd = pci_get_drvdata(pdev);
4080
4081         if (!dd) {
4082                 dev_err(&pdev->dev,
4083                         "Driver private datastructure is NULL\n");
4084                 return -EFAULT;
4085         }
4086
4087         set_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4088
4089         /* Disable ports & interrupts then send standby immediate */
4090         rv = mtip_block_suspend(dd);
4091         if (rv < 0) {
4092                 dev_err(&pdev->dev,
4093                         "Failed to suspend controller\n");
4094                 return rv;
4095         }
4096
4097         /*
4098          * Save the pci config space to pdev structure &
4099          * disable the device
4100          */
4101         pci_save_state(pdev);
4102         pci_disable_device(pdev);
4103
4104         /* Move to Low power state*/
4105         pci_set_power_state(pdev, PCI_D3hot);
4106
4107         return rv;
4108 }
4109
4110 /*
4111  * Called for each probed device when the device is resumed.
4112  *
4113  * return value
4114  *      0  Success
4115  *      <0 Error
4116  */
4117 static int mtip_pci_resume(struct pci_dev *pdev)
4118 {
4119         int rv = 0;
4120         struct driver_data *dd;
4121
4122         dd = pci_get_drvdata(pdev);
4123         if (!dd) {
4124                 dev_err(&pdev->dev,
4125                         "Driver private datastructure is NULL\n");
4126                 return -EFAULT;
4127         }
4128
4129         /* Move the device to active State */
4130         pci_set_power_state(pdev, PCI_D0);
4131
4132         /* Restore PCI configuration space */
4133         pci_restore_state(pdev);
4134
4135         /* Enable the PCI device*/
4136         rv = pcim_enable_device(pdev);
4137         if (rv < 0) {
4138                 dev_err(&pdev->dev,
4139                         "Failed to enable card during resume\n");
4140                 goto err;
4141         }
4142         pci_set_master(pdev);
4143
4144         /*
4145          * Calls hbaReset, initPort, & startPort function
4146          * then enables interrupts
4147          */
4148         rv = mtip_block_resume(dd);
4149         if (rv < 0)
4150                 dev_err(&pdev->dev, "Unable to resume\n");
4151
4152 err:
4153         clear_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4154
4155         return rv;
4156 }
4157
4158 /*
4159  * Shutdown routine
4160  *
4161  * return value
4162  *      None
4163  */
4164 static void mtip_pci_shutdown(struct pci_dev *pdev)
4165 {
4166         struct driver_data *dd = pci_get_drvdata(pdev);
4167         if (dd)
4168                 mtip_block_shutdown(dd);
4169 }
4170
4171 /* Table of device ids supported by this driver. */
4172 static DEFINE_PCI_DEVICE_TABLE(mtip_pci_tbl) = {
4173         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320H_DEVICE_ID) },
4174         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320M_DEVICE_ID) },
4175         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320S_DEVICE_ID) },
4176         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P325M_DEVICE_ID) },
4177         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420H_DEVICE_ID) },
4178         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420M_DEVICE_ID) },
4179         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P425M_DEVICE_ID) },
4180         { 0 }
4181 };
4182
4183 /* Structure that describes the PCI driver functions. */
4184 static struct pci_driver mtip_pci_driver = {
4185         .name                   = MTIP_DRV_NAME,
4186         .id_table               = mtip_pci_tbl,
4187         .probe                  = mtip_pci_probe,
4188         .remove                 = mtip_pci_remove,
4189         .suspend                = mtip_pci_suspend,
4190         .resume                 = mtip_pci_resume,
4191         .shutdown               = mtip_pci_shutdown,
4192 };
4193
4194 MODULE_DEVICE_TABLE(pci, mtip_pci_tbl);
4195
4196 /*
4197  * Module initialization function.
4198  *
4199  * Called once when the module is loaded. This function allocates a major
4200  * block device number to the Cyclone devices and registers the PCI layer
4201  * of the driver.
4202  *
4203  * Return value
4204  *      0 on success else error code.
4205  */
4206 static int __init mtip_init(void)
4207 {
4208         int error;
4209
4210         pr_info(MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n");
4211
4212         /* Allocate a major block device number to use with this driver. */
4213         error = register_blkdev(0, MTIP_DRV_NAME);
4214         if (error <= 0) {
4215                 pr_err("Unable to register block device (%d)\n",
4216                 error);
4217                 return -EBUSY;
4218         }
4219         mtip_major = error;
4220
4221         if (!dfs_parent) {
4222                 dfs_parent = debugfs_create_dir("rssd", NULL);
4223                 if (IS_ERR_OR_NULL(dfs_parent)) {
4224                         pr_warn("Error creating debugfs parent\n");
4225                         dfs_parent = NULL;
4226                 }
4227         }
4228
4229         /* Register our PCI operations. */
4230         error = pci_register_driver(&mtip_pci_driver);
4231         if (error) {
4232                 debugfs_remove(dfs_parent);
4233                 unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4234         }
4235
4236         return error;
4237 }
4238
4239 /*
4240  * Module de-initialization function.
4241  *
4242  * Called once when the module is unloaded. This function deallocates
4243  * the major block device number allocated by mtip_init() and
4244  * unregisters the PCI layer of the driver.
4245  *
4246  * Return value
4247  *      none
4248  */
4249 static void __exit mtip_exit(void)
4250 {
4251         debugfs_remove_recursive(dfs_parent);
4252
4253         /* Release the allocated major block device number. */
4254         unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4255
4256         /* Unregister the PCI driver. */
4257         pci_unregister_driver(&mtip_pci_driver);
4258 }
4259
4260 MODULE_AUTHOR("Micron Technology, Inc");
4261 MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
4262 MODULE_LICENSE("GPL");
4263 MODULE_VERSION(MTIP_DRV_VERSION);
4264
4265 module_init(mtip_init);
4266 module_exit(mtip_exit);