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 ((task_file_data & 1) || (fis->command == ATA_CMD_SEC_ERASE_UNIT))
1152                 return false;
1153
1154         if (fis->command == ATA_CMD_SEC_ERASE_PREP) {
1155                 set_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1156                 port->ic_pause_timer = jiffies;
1157                 return true;
1158         } else if ((fis->command == ATA_CMD_DOWNLOAD_MICRO) &&
1159                                         (fis->features == 0x03)) {
1160                 set_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1161                 port->ic_pause_timer = jiffies;
1162                 return true;
1163         } else if ((fis->command == ATA_CMD_SEC_ERASE_UNIT) ||
1164                 ((fis->command == 0xFC) &&
1165                         (fis->features == 0x27 || fis->features == 0x72 ||
1166                          fis->features == 0x62 || fis->features == 0x26))) {
1167                 /* Com reset after secure erase or lowlevel format */
1168                 mtip_restart_port(port);
1169                 return false;
1170         }
1171
1172         return false;
1173 }
1174
1175 /*
1176  * Wait for port to quiesce
1177  *
1178  * @port    Pointer to port data structure
1179  * @timeout Max duration to wait (ms)
1180  *
1181  * return value
1182  *      0       Success
1183  *      -EBUSY  Commands still active
1184  */
1185 static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
1186 {
1187         unsigned long to;
1188         unsigned int n;
1189         unsigned int active = 1;
1190
1191         to = jiffies + msecs_to_jiffies(timeout);
1192         do {
1193                 if (test_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags) &&
1194                         test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
1195                         msleep(20);
1196                         continue; /* svc thd is actively issuing commands */
1197                 }
1198                 if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1199                         return -EFAULT;
1200                 /*
1201                  * Ignore s_active bit 0 of array element 0.
1202                  * This bit will always be set
1203                  */
1204                 active = readl(port->s_active[0]) & 0xFFFFFFFE;
1205                 for (n = 1; n < port->dd->slot_groups; n++)
1206                         active |= readl(port->s_active[n]);
1207
1208                 if (!active)
1209                         break;
1210
1211                 msleep(20);
1212         } while (time_before(jiffies, to));
1213
1214         return active ? -EBUSY : 0;
1215 }
1216
1217 /*
1218  * Execute an internal command and wait for the completion.
1219  *
1220  * @port    Pointer to the port data structure.
1221  * @fis     Pointer to the FIS that describes the command.
1222  * @fis_len  Length in WORDS of the FIS.
1223  * @buffer  DMA accessible for command data.
1224  * @buf_len  Length, in bytes, of the data buffer.
1225  * @opts    Command header options, excluding the FIS length
1226  *             and the number of PRD entries.
1227  * @timeout Time in ms to wait for the command to complete.
1228  *
1229  * return value
1230  *      0        Command completed successfully.
1231  *      -EFAULT  The buffer address is not correctly aligned.
1232  *      -EBUSY   Internal command or other IO in progress.
1233  *      -EAGAIN  Time out waiting for command to complete.
1234  */
1235 static int mtip_exec_internal_command(struct mtip_port *port,
1236                                         struct host_to_dev_fis *fis,
1237                                         int fis_len,
1238                                         dma_addr_t buffer,
1239                                         int buf_len,
1240                                         u32 opts,
1241                                         gfp_t atomic,
1242                                         unsigned long timeout)
1243 {
1244         struct mtip_cmd_sg *command_sg;
1245         DECLARE_COMPLETION_ONSTACK(wait);
1246         int rv = 0, ready2go = 1;
1247         struct mtip_cmd *int_cmd = &port->commands[MTIP_TAG_INTERNAL];
1248         unsigned long to;
1249
1250         /* Make sure the buffer is 8 byte aligned. This is asic specific. */
1251         if (buffer & 0x00000007) {
1252                 dev_err(&port->dd->pdev->dev,
1253                         "SG buffer is not 8 byte aligned\n");
1254                 return -EFAULT;
1255         }
1256
1257         to = jiffies + msecs_to_jiffies(timeout);
1258         do {
1259                 ready2go = !test_and_set_bit(MTIP_TAG_INTERNAL,
1260                                                 port->allocated);
1261                 if (ready2go)
1262                         break;
1263                 mdelay(100);
1264         } while (time_before(jiffies, to));
1265         if (!ready2go) {
1266                 dev_warn(&port->dd->pdev->dev,
1267                         "Internal cmd active. new cmd [%02X]\n", fis->command);
1268                 return -EBUSY;
1269         }
1270         set_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1271         port->ic_pause_timer = 0;
1272
1273         if (fis->command == ATA_CMD_SEC_ERASE_UNIT)
1274                 clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1275         else if (fis->command == ATA_CMD_DOWNLOAD_MICRO)
1276                 clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1277
1278         if (atomic == GFP_KERNEL) {
1279                 if (fis->command != ATA_CMD_STANDBYNOW1) {
1280                         /* wait for io to complete if non atomic */
1281                         if (mtip_quiesce_io(port, 5000) < 0) {
1282                                 dev_warn(&port->dd->pdev->dev,
1283                                         "Failed to quiesce IO\n");
1284                                 release_slot(port, MTIP_TAG_INTERNAL);
1285                                 clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1286                                 wake_up_interruptible(&port->svc_wait);
1287                                 return -EBUSY;
1288                         }
1289                 }
1290
1291                 /* Set the completion function and data for the command. */
1292                 int_cmd->comp_data = &wait;
1293                 int_cmd->comp_func = mtip_completion;
1294
1295         } else {
1296                 /* Clear completion - we're going to poll */
1297                 int_cmd->comp_data = NULL;
1298                 int_cmd->comp_func = mtip_null_completion;
1299         }
1300
1301         /* Copy the command to the command table */
1302         memcpy(int_cmd->command, fis, fis_len*4);
1303
1304         /* Populate the SG list */
1305         int_cmd->command_header->opts =
1306                  __force_bit2int cpu_to_le32(opts | fis_len);
1307         if (buf_len) {
1308                 command_sg = int_cmd->command + AHCI_CMD_TBL_HDR_SZ;
1309
1310                 command_sg->info =
1311                         __force_bit2int cpu_to_le32((buf_len-1) & 0x3FFFFF);
1312                 command_sg->dba =
1313                         __force_bit2int cpu_to_le32(buffer & 0xFFFFFFFF);
1314                 command_sg->dba_upper =
1315                         __force_bit2int cpu_to_le32((buffer >> 16) >> 16);
1316
1317                 int_cmd->command_header->opts |=
1318                         __force_bit2int cpu_to_le32((1 << 16));
1319         }
1320
1321         /* Populate the command header */
1322         int_cmd->command_header->byte_count = 0;
1323
1324         /* Issue the command to the hardware */
1325         mtip_issue_non_ncq_command(port, MTIP_TAG_INTERNAL);
1326
1327         /* Poll if atomic, wait_for_completion otherwise */
1328         if (atomic == GFP_KERNEL) {
1329                 /* Wait for the command to complete or timeout. */
1330                 if (wait_for_completion_timeout(
1331                                 &wait,
1332                                 msecs_to_jiffies(timeout)) == 0) {
1333                         dev_err(&port->dd->pdev->dev,
1334                                 "Internal command did not complete [%d] "
1335                                 "within timeout of  %lu ms\n",
1336                                 atomic, timeout);
1337                         if (mtip_check_surprise_removal(port->dd->pdev) ||
1338                                 test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1339                                                 &port->dd->dd_flag)) {
1340                                 rv = -ENXIO;
1341                                 goto exec_ic_exit;
1342                         }
1343                         rv = -EAGAIN;
1344                 }
1345         } else {
1346                 /* Spin for <timeout> checking if command still outstanding */
1347                 timeout = jiffies + msecs_to_jiffies(timeout);
1348                 while ((readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1349                                 & (1 << MTIP_TAG_INTERNAL))
1350                                 && time_before(jiffies, timeout)) {
1351                         if (mtip_check_surprise_removal(port->dd->pdev)) {
1352                                 rv = -ENXIO;
1353                                 goto exec_ic_exit;
1354                         }
1355                         if ((fis->command != ATA_CMD_STANDBYNOW1) &&
1356                                 test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1357                                                 &port->dd->dd_flag)) {
1358                                 rv = -ENXIO;
1359                                 goto exec_ic_exit;
1360                         }
1361                         if (readl(port->mmio + PORT_IRQ_STAT) & PORT_IRQ_ERR) {
1362                                 atomic_inc(&int_cmd->active); /* error */
1363                                 break;
1364                         }
1365                 }
1366         }
1367
1368         if (atomic_read(&int_cmd->active) > 1) {
1369                 dev_err(&port->dd->pdev->dev,
1370                         "Internal command [%02X] failed\n", fis->command);
1371                 rv = -EIO;
1372         }
1373         if (readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1374                         & (1 << MTIP_TAG_INTERNAL)) {
1375                 rv = -ENXIO;
1376                 if (!test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1377                                         &port->dd->dd_flag)) {
1378                         mtip_restart_port(port);
1379                         rv = -EAGAIN;
1380                 }
1381         }
1382 exec_ic_exit:
1383         /* Clear the allocated and active bits for the internal command. */
1384         atomic_set(&int_cmd->active, 0);
1385         release_slot(port, MTIP_TAG_INTERNAL);
1386         if (rv >= 0 && mtip_pause_ncq(port, fis)) {
1387                 /* NCQ paused */
1388                 return rv;
1389         }
1390         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1391         wake_up_interruptible(&port->svc_wait);
1392
1393         return rv;
1394 }
1395
1396 /*
1397  * Byte-swap ATA ID strings.
1398  *
1399  * ATA identify data contains strings in byte-swapped 16-bit words.
1400  * They must be swapped (on all architectures) to be usable as C strings.
1401  * This function swaps bytes in-place.
1402  *
1403  * @buf The buffer location of the string
1404  * @len The number of bytes to swap
1405  *
1406  * return value
1407  *      None
1408  */
1409 static inline void ata_swap_string(u16 *buf, unsigned int len)
1410 {
1411         int i;
1412         for (i = 0; i < (len/2); i++)
1413                 be16_to_cpus(&buf[i]);
1414 }
1415
1416 /*
1417  * Request the device identity information.
1418  *
1419  * If a user space buffer is not specified, i.e. is NULL, the
1420  * identify information is still read from the drive and placed
1421  * into the identify data buffer (@e port->identify) in the
1422  * port data structure.
1423  * When the identify buffer contains valid identify information @e
1424  * port->identify_valid is non-zero.
1425  *
1426  * @port         Pointer to the port structure.
1427  * @user_buffer  A user space buffer where the identify data should be
1428  *                    copied.
1429  *
1430  * return value
1431  *      0       Command completed successfully.
1432  *      -EFAULT An error occurred while coping data to the user buffer.
1433  *      -1      Command failed.
1434  */
1435 static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
1436 {
1437         int rv = 0;
1438         struct host_to_dev_fis fis;
1439
1440         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1441                 return -EFAULT;
1442
1443         /* Build the FIS. */
1444         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1445         fis.type        = 0x27;
1446         fis.opts        = 1 << 7;
1447         fis.command     = ATA_CMD_ID_ATA;
1448
1449         /* Set the identify information as invalid. */
1450         port->identify_valid = 0;
1451
1452         /* Clear the identify information. */
1453         memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);
1454
1455         /* Execute the command. */
1456         if (mtip_exec_internal_command(port,
1457                                 &fis,
1458                                 5,
1459                                 port->identify_dma,
1460                                 sizeof(u16) * ATA_ID_WORDS,
1461                                 0,
1462                                 GFP_KERNEL,
1463                                 MTIP_INTERNAL_COMMAND_TIMEOUT_MS)
1464                                 < 0) {
1465                 rv = -1;
1466                 goto out;
1467         }
1468
1469         /*
1470          * Perform any necessary byte-swapping.  Yes, the kernel does in fact
1471          * perform field-sensitive swapping on the string fields.
1472          * See the kernel use of ata_id_string() for proof of this.
1473          */
1474 #ifdef __LITTLE_ENDIAN
1475         ata_swap_string(port->identify + 27, 40);  /* model string*/
1476         ata_swap_string(port->identify + 23, 8);   /* firmware string*/
1477         ata_swap_string(port->identify + 10, 20);  /* serial# string*/
1478 #else
1479         {
1480                 int i;
1481                 for (i = 0; i < ATA_ID_WORDS; i++)
1482                         port->identify[i] = le16_to_cpu(port->identify[i]);
1483         }
1484 #endif
1485
1486         /* Set the identify buffer as valid. */
1487         port->identify_valid = 1;
1488
1489         if (user_buffer) {
1490                 if (copy_to_user(
1491                         user_buffer,
1492                         port->identify,
1493                         ATA_ID_WORDS * sizeof(u16))) {
1494                         rv = -EFAULT;
1495                         goto out;
1496                 }
1497         }
1498
1499 out:
1500         return rv;
1501 }
1502
1503 /*
1504  * Issue a standby immediate command to the device.
1505  *
1506  * @port Pointer to the port structure.
1507  *
1508  * return value
1509  *      0       Command was executed successfully.
1510  *      -1      An error occurred while executing the command.
1511  */
1512 static int mtip_standby_immediate(struct mtip_port *port)
1513 {
1514         int rv;
1515         struct host_to_dev_fis  fis;
1516         unsigned long start;
1517
1518         /* Build the FIS. */
1519         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1520         fis.type        = 0x27;
1521         fis.opts        = 1 << 7;
1522         fis.command     = ATA_CMD_STANDBYNOW1;
1523
1524         start = jiffies;
1525         rv = mtip_exec_internal_command(port,
1526                                         &fis,
1527                                         5,
1528                                         0,
1529                                         0,
1530                                         0,
1531                                         GFP_ATOMIC,
1532                                         15000);
1533         dbg_printk(MTIP_DRV_NAME "Time taken to complete standby cmd: %d ms\n",
1534                         jiffies_to_msecs(jiffies - start));
1535         if (rv)
1536                 dev_warn(&port->dd->pdev->dev,
1537                         "STANDBY IMMEDIATE command failed.\n");
1538
1539         return rv;
1540 }
1541
1542 /*
1543  * Issue a READ LOG EXT command to the device.
1544  *
1545  * @port        pointer to the port structure.
1546  * @page        page number to fetch
1547  * @buffer      pointer to buffer
1548  * @buffer_dma  dma address corresponding to @buffer
1549  * @sectors     page length to fetch, in sectors
1550  *
1551  * return value
1552  *      @rv     return value from mtip_exec_internal_command()
1553  */
1554 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
1555                                 dma_addr_t buffer_dma, unsigned int sectors)
1556 {
1557         struct host_to_dev_fis fis;
1558
1559         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1560         fis.type        = 0x27;
1561         fis.opts        = 1 << 7;
1562         fis.command     = ATA_CMD_READ_LOG_EXT;
1563         fis.sect_count  = sectors & 0xFF;
1564         fis.sect_cnt_ex = (sectors >> 8) & 0xFF;
1565         fis.lba_low     = page;
1566         fis.lba_mid     = 0;
1567         fis.device      = ATA_DEVICE_OBS;
1568
1569         memset(buffer, 0, sectors * ATA_SECT_SIZE);
1570
1571         return mtip_exec_internal_command(port,
1572                                         &fis,
1573                                         5,
1574                                         buffer_dma,
1575                                         sectors * ATA_SECT_SIZE,
1576                                         0,
1577                                         GFP_ATOMIC,
1578                                         MTIP_INTERNAL_COMMAND_TIMEOUT_MS);
1579 }
1580
1581 /*
1582  * Issue a SMART READ DATA command to the device.
1583  *
1584  * @port        pointer to the port structure.
1585  * @buffer      pointer to buffer
1586  * @buffer_dma  dma address corresponding to @buffer
1587  *
1588  * return value
1589  *      @rv     return value from mtip_exec_internal_command()
1590  */
1591 static int mtip_get_smart_data(struct mtip_port *port, u8 *buffer,
1592                                         dma_addr_t buffer_dma)
1593 {
1594         struct host_to_dev_fis fis;
1595
1596         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1597         fis.type        = 0x27;
1598         fis.opts        = 1 << 7;
1599         fis.command     = ATA_CMD_SMART;
1600         fis.features    = 0xD0;
1601         fis.sect_count  = 1;
1602         fis.lba_mid     = 0x4F;
1603         fis.lba_hi      = 0xC2;
1604         fis.device      = ATA_DEVICE_OBS;
1605
1606         return mtip_exec_internal_command(port,
1607                                         &fis,
1608                                         5,
1609                                         buffer_dma,
1610                                         ATA_SECT_SIZE,
1611                                         0,
1612                                         GFP_ATOMIC,
1613                                         15000);
1614 }
1615
1616 /*
1617  * Get the value of a smart attribute
1618  *
1619  * @port        pointer to the port structure
1620  * @id          attribute number
1621  * @attrib      pointer to return attrib information corresponding to @id
1622  *
1623  * return value
1624  *      -EINVAL NULL buffer passed or unsupported attribute @id.
1625  *      -EPERM  Identify data not valid, SMART not supported or not enabled
1626  */
1627 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
1628                                                 struct smart_attr *attrib)
1629 {
1630         int rv, i;
1631         struct smart_attr *pattr;
1632
1633         if (!attrib)
1634                 return -EINVAL;
1635
1636         if (!port->identify_valid) {
1637                 dev_warn(&port->dd->pdev->dev, "IDENTIFY DATA not valid\n");
1638                 return -EPERM;
1639         }
1640         if (!(port->identify[82] & 0x1)) {
1641                 dev_warn(&port->dd->pdev->dev, "SMART not supported\n");
1642                 return -EPERM;
1643         }
1644         if (!(port->identify[85] & 0x1)) {
1645                 dev_warn(&port->dd->pdev->dev, "SMART not enabled\n");
1646                 return -EPERM;
1647         }
1648
1649         memset(port->smart_buf, 0, ATA_SECT_SIZE);
1650         rv = mtip_get_smart_data(port, port->smart_buf, port->smart_buf_dma);
1651         if (rv) {
1652                 dev_warn(&port->dd->pdev->dev, "Failed to ge SMART data\n");
1653                 return rv;
1654         }
1655
1656         pattr = (struct smart_attr *)(port->smart_buf + 2);
1657         for (i = 0; i < 29; i++, pattr++)
1658                 if (pattr->attr_id == id) {
1659                         memcpy(attrib, pattr, sizeof(struct smart_attr));
1660                         break;
1661                 }
1662
1663         if (i == 29) {
1664                 dev_warn(&port->dd->pdev->dev,
1665                         "Query for invalid SMART attribute ID\n");
1666                 rv = -EINVAL;
1667         }
1668
1669         return rv;
1670 }
1671
1672 /*
1673  * Get the drive capacity.
1674  *
1675  * @dd      Pointer to the device data structure.
1676  * @sectors Pointer to the variable that will receive the sector count.
1677  *
1678  * return value
1679  *      1 Capacity was returned successfully.
1680  *      0 The identify information is invalid.
1681  */
1682 static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
1683 {
1684         struct mtip_port *port = dd->port;
1685         u64 total, raw0, raw1, raw2, raw3;
1686         raw0 = port->identify[100];
1687         raw1 = port->identify[101];
1688         raw2 = port->identify[102];
1689         raw3 = port->identify[103];
1690         total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
1691         *sectors = total;
1692         return (bool) !!port->identify_valid;
1693 }
1694
1695 /*
1696  * Reset the HBA.
1697  *
1698  * Resets the HBA by setting the HBA Reset bit in the Global
1699  * HBA Control register. After setting the HBA Reset bit the
1700  * function waits for 1 second before reading the HBA Reset
1701  * bit to make sure it has cleared. If HBA Reset is not clear
1702  * an error is returned. Cannot be used in non-blockable
1703  * context.
1704  *
1705  * @dd Pointer to the driver data structure.
1706  *
1707  * return value
1708  *      0  The reset was successful.
1709  *      -1 The HBA Reset bit did not clear.
1710  */
1711 static int mtip_hba_reset(struct driver_data *dd)
1712 {
1713         mtip_deinit_port(dd->port);
1714
1715         /* Set the reset bit */
1716         writel(HOST_RESET, dd->mmio + HOST_CTL);
1717
1718         /* Flush */
1719         readl(dd->mmio + HOST_CTL);
1720
1721         /* Wait for reset to clear */
1722         ssleep(1);
1723
1724         /* Check the bit has cleared */
1725         if (readl(dd->mmio + HOST_CTL) & HOST_RESET) {
1726                 dev_err(&dd->pdev->dev,
1727                         "Reset bit did not clear.\n");
1728                 return -1;
1729         }
1730
1731         return 0;
1732 }
1733
1734 /*
1735  * Display the identify command data.
1736  *
1737  * @port Pointer to the port data structure.
1738  *
1739  * return value
1740  *      None
1741  */
1742 static void mtip_dump_identify(struct mtip_port *port)
1743 {
1744         sector_t sectors;
1745         unsigned short revid;
1746         char cbuf[42];
1747
1748         if (!port->identify_valid)
1749                 return;
1750
1751         strlcpy(cbuf, (char *)(port->identify+10), 21);
1752         dev_info(&port->dd->pdev->dev,
1753                 "Serial No.: %s\n", cbuf);
1754
1755         strlcpy(cbuf, (char *)(port->identify+23), 9);
1756         dev_info(&port->dd->pdev->dev,
1757                 "Firmware Ver.: %s\n", cbuf);
1758
1759         strlcpy(cbuf, (char *)(port->identify+27), 41);
1760         dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);
1761
1762         if (mtip_hw_get_capacity(port->dd, &sectors))
1763                 dev_info(&port->dd->pdev->dev,
1764                         "Capacity: %llu sectors (%llu MB)\n",
1765                          (u64)sectors,
1766                          ((u64)sectors) * ATA_SECT_SIZE >> 20);
1767
1768         pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
1769         switch (revid & 0xFF) {
1770         case 0x1:
1771                 strlcpy(cbuf, "A0", 3);
1772                 break;
1773         case 0x3:
1774                 strlcpy(cbuf, "A2", 3);
1775                 break;
1776         default:
1777                 strlcpy(cbuf, "?", 2);
1778                 break;
1779         }
1780         dev_info(&port->dd->pdev->dev,
1781                 "Card Type: %s\n", cbuf);
1782 }
1783
1784 /*
1785  * Map the commands scatter list into the command table.
1786  *
1787  * @command Pointer to the command.
1788  * @nents Number of scatter list entries.
1789  *
1790  * return value
1791  *      None
1792  */
1793 static inline void fill_command_sg(struct driver_data *dd,
1794                                 struct mtip_cmd *command,
1795                                 int nents)
1796 {
1797         int n;
1798         unsigned int dma_len;
1799         struct mtip_cmd_sg *command_sg;
1800         struct scatterlist *sg = command->sg;
1801
1802         command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
1803
1804         for (n = 0; n < nents; n++) {
1805                 dma_len = sg_dma_len(sg);
1806                 if (dma_len > 0x400000)
1807                         dev_err(&dd->pdev->dev,
1808                                 "DMA segment length truncated\n");
1809                 command_sg->info = __force_bit2int
1810                         cpu_to_le32((dma_len-1) & 0x3FFFFF);
1811                 command_sg->dba = __force_bit2int
1812                         cpu_to_le32(sg_dma_address(sg));
1813                 command_sg->dba_upper = __force_bit2int
1814                         cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
1815                 command_sg++;
1816                 sg++;
1817         }
1818 }
1819
1820 /*
1821  * @brief Execute a drive command.
1822  *
1823  * return value 0 The command completed successfully.
1824  * return value -1 An error occurred while executing the command.
1825  */
1826 static int exec_drive_task(struct mtip_port *port, u8 *command)
1827 {
1828         struct host_to_dev_fis  fis;
1829         struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
1830
1831         /* Build the FIS. */
1832         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1833         fis.type        = 0x27;
1834         fis.opts        = 1 << 7;
1835         fis.command     = command[0];
1836         fis.features    = command[1];
1837         fis.sect_count  = command[2];
1838         fis.sector      = command[3];
1839         fis.cyl_low     = command[4];
1840         fis.cyl_hi      = command[5];
1841         fis.device      = command[6] & ~0x10; /* Clear the dev bit*/
1842
1843         dbg_printk(MTIP_DRV_NAME " %s: User Command: cmd %x, feat %x, nsect %x, sect %x, lcyl %x, hcyl %x, sel %x\n",
1844                 __func__,
1845                 command[0],
1846                 command[1],
1847                 command[2],
1848                 command[3],
1849                 command[4],
1850                 command[5],
1851                 command[6]);
1852
1853         /* Execute the command. */
1854         if (mtip_exec_internal_command(port,
1855                                  &fis,
1856                                  5,
1857                                  0,
1858                                  0,
1859                                  0,
1860                                  GFP_KERNEL,
1861                                  MTIP_IOCTL_COMMAND_TIMEOUT_MS) < 0) {
1862                 return -1;
1863         }
1864
1865         command[0] = reply->command; /* Status*/
1866         command[1] = reply->features; /* Error*/
1867         command[4] = reply->cyl_low;
1868         command[5] = reply->cyl_hi;
1869
1870         dbg_printk(MTIP_DRV_NAME " %s: Completion Status: stat %x, err %x , cyl_lo %x cyl_hi %x\n",
1871                 __func__,
1872                 command[0],
1873                 command[1],
1874                 command[4],
1875                 command[5]);
1876
1877         return 0;
1878 }
1879
1880 /*
1881  * @brief Execute a drive command.
1882  *
1883  * @param port Pointer to the port data structure.
1884  * @param command Pointer to the user specified command parameters.
1885  * @param user_buffer Pointer to the user space buffer where read sector
1886  *                   data should be copied.
1887  *
1888  * return value 0 The command completed successfully.
1889  * return value -EFAULT An error occurred while copying the completion
1890  *                 data to the user space buffer.
1891  * return value -1 An error occurred while executing the command.
1892  */
1893 static int exec_drive_command(struct mtip_port *port, u8 *command,
1894                                 void __user *user_buffer)
1895 {
1896         struct host_to_dev_fis  fis;
1897         struct host_to_dev_fis *reply;
1898         u8 *buf = NULL;
1899         dma_addr_t dma_addr = 0;
1900         int rv = 0, xfer_sz = command[3];
1901
1902         if (xfer_sz) {
1903                 if (user_buffer)
1904                         return -EFAULT;
1905
1906                 buf = dmam_alloc_coherent(&port->dd->pdev->dev,
1907                                 ATA_SECT_SIZE * xfer_sz,
1908                                 &dma_addr,
1909                                 GFP_KERNEL);
1910                 if (!buf) {
1911                         dev_err(&port->dd->pdev->dev,
1912                                 "Memory allocation failed (%d bytes)\n",
1913                                 ATA_SECT_SIZE * xfer_sz);
1914                         return -ENOMEM;
1915                 }
1916                 memset(buf, 0, ATA_SECT_SIZE * xfer_sz);
1917         }
1918
1919         /* Build the FIS. */
1920         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1921         fis.type        = 0x27;
1922         fis.opts        = 1 << 7;
1923         fis.command     = command[0];
1924         fis.features    = command[2];
1925         fis.sect_count  = command[3];
1926         if (fis.command == ATA_CMD_SMART) {
1927                 fis.sector      = command[1];
1928                 fis.cyl_low     = 0x4F;
1929                 fis.cyl_hi      = 0xC2;
1930         }
1931
1932         if (xfer_sz)
1933                 reply = (port->rxfis + RX_FIS_PIO_SETUP);
1934         else
1935                 reply = (port->rxfis + RX_FIS_D2H_REG);
1936
1937         dbg_printk(MTIP_DRV_NAME
1938                 " %s: User Command: cmd %x, sect %x, "
1939                 "feat %x, sectcnt %x\n",
1940                 __func__,
1941                 command[0],
1942                 command[1],
1943                 command[2],
1944                 command[3]);
1945
1946         /* Execute the command. */
1947         if (mtip_exec_internal_command(port,
1948                                 &fis,
1949                                  5,
1950                                  (xfer_sz ? dma_addr : 0),
1951                                  (xfer_sz ? ATA_SECT_SIZE * xfer_sz : 0),
1952                                  0,
1953                                  GFP_KERNEL,
1954                                  MTIP_IOCTL_COMMAND_TIMEOUT_MS)
1955                                  < 0) {
1956                 rv = -EFAULT;
1957                 goto exit_drive_command;
1958         }
1959
1960         /* Collect the completion status. */
1961         command[0] = reply->command; /* Status*/
1962         command[1] = reply->features; /* Error*/
1963         command[2] = reply->sect_count;
1964
1965         dbg_printk(MTIP_DRV_NAME
1966                 " %s: Completion Status: stat %x, "
1967                 "err %x, nsect %x\n",
1968                 __func__,
1969                 command[0],
1970                 command[1],
1971                 command[2]);
1972
1973         if (xfer_sz) {
1974                 if (copy_to_user(user_buffer,
1975                                  buf,
1976                                  ATA_SECT_SIZE * command[3])) {
1977                         rv = -EFAULT;
1978                         goto exit_drive_command;
1979                 }
1980         }
1981 exit_drive_command:
1982         if (buf)
1983                 dmam_free_coherent(&port->dd->pdev->dev,
1984                                 ATA_SECT_SIZE * xfer_sz, buf, dma_addr);
1985         return rv;
1986 }
1987
1988 /*
1989  *  Indicates whether a command has a single sector payload.
1990  *
1991  *  @command passed to the device to perform the certain event.
1992  *  @features passed to the device to perform the certain event.
1993  *
1994  *  return value
1995  *      1       command is one that always has a single sector payload,
1996  *              regardless of the value in the Sector Count field.
1997  *      0       otherwise
1998  *
1999  */
2000 static unsigned int implicit_sector(unsigned char command,
2001                                     unsigned char features)
2002 {
2003         unsigned int rv = 0;
2004
2005         /* list of commands that have an implicit sector count of 1 */
2006         switch (command) {
2007         case ATA_CMD_SEC_SET_PASS:
2008         case ATA_CMD_SEC_UNLOCK:
2009         case ATA_CMD_SEC_ERASE_PREP:
2010         case ATA_CMD_SEC_ERASE_UNIT:
2011         case ATA_CMD_SEC_FREEZE_LOCK:
2012         case ATA_CMD_SEC_DISABLE_PASS:
2013         case ATA_CMD_PMP_READ:
2014         case ATA_CMD_PMP_WRITE:
2015                 rv = 1;
2016                 break;
2017         case ATA_CMD_SET_MAX:
2018                 if (features == ATA_SET_MAX_UNLOCK)
2019                         rv = 1;
2020                 break;
2021         case ATA_CMD_SMART:
2022                 if ((features == ATA_SMART_READ_VALUES) ||
2023                                 (features == ATA_SMART_READ_THRESHOLDS))
2024                         rv = 1;
2025                 break;
2026         case ATA_CMD_CONF_OVERLAY:
2027                 if ((features == ATA_DCO_IDENTIFY) ||
2028                                 (features == ATA_DCO_SET))
2029                         rv = 1;
2030                 break;
2031         }
2032         return rv;
2033 }
2034
2035 static void mtip_set_timeout(struct host_to_dev_fis *fis, unsigned int *timeout)
2036 {
2037         switch (fis->command) {
2038         case ATA_CMD_DOWNLOAD_MICRO:
2039                 *timeout = 120000; /* 2 minutes */
2040                 break;
2041         case ATA_CMD_SEC_ERASE_UNIT:
2042         case 0xFC:
2043                 *timeout = 240000; /* 4 minutes */
2044                 break;
2045         case ATA_CMD_STANDBYNOW1:
2046                 *timeout = 10000;  /* 10 seconds */
2047                 break;
2048         case 0xF7:
2049         case 0xFA:
2050                 *timeout = 60000;  /* 60 seconds */
2051                 break;
2052         case ATA_CMD_SMART:
2053                 *timeout = 15000;  /* 15 seconds */
2054                 break;
2055         default:
2056                 *timeout = MTIP_IOCTL_COMMAND_TIMEOUT_MS;
2057                 break;
2058         }
2059 }
2060
2061 /*
2062  * Executes a taskfile
2063  * See ide_taskfile_ioctl() for derivation
2064  */
2065 static int exec_drive_taskfile(struct driver_data *dd,
2066                                void __user *buf,
2067                                ide_task_request_t *req_task,
2068                                int outtotal)
2069 {
2070         struct host_to_dev_fis  fis;
2071         struct host_to_dev_fis *reply;
2072         u8 *outbuf = NULL;
2073         u8 *inbuf = NULL;
2074         dma_addr_t outbuf_dma = 0;
2075         dma_addr_t inbuf_dma = 0;
2076         dma_addr_t dma_buffer = 0;
2077         int err = 0;
2078         unsigned int taskin = 0;
2079         unsigned int taskout = 0;
2080         u8 nsect = 0;
2081         unsigned int timeout;
2082         unsigned int force_single_sector;
2083         unsigned int transfer_size;
2084         unsigned long task_file_data;
2085         int intotal = outtotal + req_task->out_size;
2086
2087         taskout = req_task->out_size;
2088         taskin = req_task->in_size;
2089         /* 130560 = 512 * 0xFF*/
2090         if (taskin > 130560 || taskout > 130560) {
2091                 err = -EINVAL;
2092                 goto abort;
2093         }
2094
2095         if (taskout) {
2096                 outbuf = kzalloc(taskout, GFP_KERNEL);
2097                 if (outbuf == NULL) {
2098                         err = -ENOMEM;
2099                         goto abort;
2100                 }
2101                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
2102                         err = -EFAULT;
2103                         goto abort;
2104                 }
2105                 outbuf_dma = pci_map_single(dd->pdev,
2106                                          outbuf,
2107                                          taskout,
2108                                          DMA_TO_DEVICE);
2109                 if (outbuf_dma == 0) {
2110                         err = -ENOMEM;
2111                         goto abort;
2112                 }
2113                 dma_buffer = outbuf_dma;
2114         }
2115
2116         if (taskin) {
2117                 inbuf = kzalloc(taskin, GFP_KERNEL);
2118                 if (inbuf == NULL) {
2119                         err = -ENOMEM;
2120                         goto abort;
2121                 }
2122
2123                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
2124                         err = -EFAULT;
2125                         goto abort;
2126                 }
2127                 inbuf_dma = pci_map_single(dd->pdev,
2128                                          inbuf,
2129                                          taskin, DMA_FROM_DEVICE);
2130                 if (inbuf_dma == 0) {
2131                         err = -ENOMEM;
2132                         goto abort;
2133                 }
2134                 dma_buffer = inbuf_dma;
2135         }
2136
2137         /* only supports PIO and non-data commands from this ioctl. */
2138         switch (req_task->data_phase) {
2139         case TASKFILE_OUT:
2140                 nsect = taskout / ATA_SECT_SIZE;
2141                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
2142                 break;
2143         case TASKFILE_IN:
2144                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
2145                 break;
2146         case TASKFILE_NO_DATA:
2147                 reply = (dd->port->rxfis + RX_FIS_D2H_REG);
2148                 break;
2149         default:
2150                 err = -EINVAL;
2151                 goto abort;
2152         }
2153
2154         /* Build the FIS. */
2155         memset(&fis, 0, sizeof(struct host_to_dev_fis));
2156
2157         fis.type        = 0x27;
2158         fis.opts        = 1 << 7;
2159         fis.command     = req_task->io_ports[7];
2160         fis.features    = req_task->io_ports[1];
2161         fis.sect_count  = req_task->io_ports[2];
2162         fis.lba_low     = req_task->io_ports[3];
2163         fis.lba_mid     = req_task->io_ports[4];
2164         fis.lba_hi      = req_task->io_ports[5];
2165          /* Clear the dev bit*/
2166         fis.device      = req_task->io_ports[6] & ~0x10;
2167
2168         if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
2169                 req_task->in_flags.all  =
2170                         IDE_TASKFILE_STD_IN_FLAGS |
2171                         (IDE_HOB_STD_IN_FLAGS << 8);
2172                 fis.lba_low_ex          = req_task->hob_ports[3];
2173                 fis.lba_mid_ex          = req_task->hob_ports[4];
2174                 fis.lba_hi_ex           = req_task->hob_ports[5];
2175                 fis.features_ex         = req_task->hob_ports[1];
2176                 fis.sect_cnt_ex         = req_task->hob_ports[2];
2177
2178         } else {
2179                 req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
2180         }
2181
2182         force_single_sector = implicit_sector(fis.command, fis.features);
2183
2184         if ((taskin || taskout) && (!fis.sect_count)) {
2185                 if (nsect)
2186                         fis.sect_count = nsect;
2187                 else {
2188                         if (!force_single_sector) {
2189                                 dev_warn(&dd->pdev->dev,
2190                                         "data movement but "
2191                                         "sect_count is 0\n");
2192                                         err = -EINVAL;
2193                                         goto abort;
2194                         }
2195                 }
2196         }
2197
2198         dbg_printk(MTIP_DRV_NAME
2199                 " %s: cmd %x, feat %x, nsect %x,"
2200                 " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
2201                 " head/dev %x\n",
2202                 __func__,
2203                 fis.command,
2204                 fis.features,
2205                 fis.sect_count,
2206                 fis.lba_low,
2207                 fis.lba_mid,
2208                 fis.lba_hi,
2209                 fis.device);
2210
2211         mtip_set_timeout(&fis, &timeout);
2212
2213         /* Determine the correct transfer size.*/
2214         if (force_single_sector)
2215                 transfer_size = ATA_SECT_SIZE;
2216         else
2217                 transfer_size = ATA_SECT_SIZE * fis.sect_count;
2218
2219         /* Execute the command.*/
2220         if (mtip_exec_internal_command(dd->port,
2221                                  &fis,
2222                                  5,
2223                                  dma_buffer,
2224                                  transfer_size,
2225                                  0,
2226                                  GFP_KERNEL,
2227                                  timeout) < 0) {
2228                 err = -EIO;
2229                 goto abort;
2230         }
2231
2232         task_file_data = readl(dd->port->mmio+PORT_TFDATA);
2233
2234         if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
2235                 reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
2236                 req_task->io_ports[7] = reply->control;
2237         } else {
2238                 reply = dd->port->rxfis + RX_FIS_D2H_REG;
2239                 req_task->io_ports[7] = reply->command;
2240         }
2241
2242         /* reclaim the DMA buffers.*/
2243         if (inbuf_dma)
2244                 pci_unmap_single(dd->pdev, inbuf_dma,
2245                         taskin, DMA_FROM_DEVICE);
2246         if (outbuf_dma)
2247                 pci_unmap_single(dd->pdev, outbuf_dma,
2248                         taskout, DMA_TO_DEVICE);
2249         inbuf_dma  = 0;
2250         outbuf_dma = 0;
2251
2252         /* return the ATA registers to the caller.*/
2253         req_task->io_ports[1] = reply->features;
2254         req_task->io_ports[2] = reply->sect_count;
2255         req_task->io_ports[3] = reply->lba_low;
2256         req_task->io_ports[4] = reply->lba_mid;
2257         req_task->io_ports[5] = reply->lba_hi;
2258         req_task->io_ports[6] = reply->device;
2259
2260         if (req_task->out_flags.all & 1)  {
2261
2262                 req_task->hob_ports[3] = reply->lba_low_ex;
2263                 req_task->hob_ports[4] = reply->lba_mid_ex;
2264                 req_task->hob_ports[5] = reply->lba_hi_ex;
2265                 req_task->hob_ports[1] = reply->features_ex;
2266                 req_task->hob_ports[2] = reply->sect_cnt_ex;
2267         }
2268         dbg_printk(MTIP_DRV_NAME
2269                 " %s: Completion: stat %x,"
2270                 "err %x, sect_cnt %x, lbalo %x,"
2271                 "lbamid %x, lbahi %x, dev %x\n",
2272                 __func__,
2273                 req_task->io_ports[7],
2274                 req_task->io_ports[1],
2275                 req_task->io_ports[2],
2276                 req_task->io_ports[3],
2277                 req_task->io_ports[4],
2278                 req_task->io_ports[5],
2279                 req_task->io_ports[6]);
2280
2281         if (taskout) {
2282                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
2283                         err = -EFAULT;
2284                         goto abort;
2285                 }
2286         }
2287         if (taskin) {
2288                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
2289                         err = -EFAULT;
2290                         goto abort;
2291                 }
2292         }
2293 abort:
2294         if (inbuf_dma)
2295                 pci_unmap_single(dd->pdev, inbuf_dma,
2296                                         taskin, DMA_FROM_DEVICE);
2297         if (outbuf_dma)
2298                 pci_unmap_single(dd->pdev, outbuf_dma,
2299                                         taskout, DMA_TO_DEVICE);
2300         kfree(outbuf);
2301         kfree(inbuf);
2302
2303         return err;
2304 }
2305
2306 /*
2307  * Handle IOCTL calls from the Block Layer.
2308  *
2309  * This function is called by the Block Layer when it receives an IOCTL
2310  * command that it does not understand. If the IOCTL command is not supported
2311  * this function returns -ENOTTY.
2312  *
2313  * @dd  Pointer to the driver data structure.
2314  * @cmd IOCTL command passed from the Block Layer.
2315  * @arg IOCTL argument passed from the Block Layer.
2316  *
2317  * return value
2318  *      0       The IOCTL completed successfully.
2319  *      -ENOTTY The specified command is not supported.
2320  *      -EFAULT An error occurred copying data to a user space buffer.
2321  *      -EIO    An error occurred while executing the command.
2322  */
2323 static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
2324                          unsigned long arg)
2325 {
2326         switch (cmd) {
2327         case HDIO_GET_IDENTITY:
2328         {
2329                 if (copy_to_user((void __user *)arg, dd->port->identify,
2330                                                 sizeof(u16) * ATA_ID_WORDS))
2331                         return -EFAULT;
2332                 break;
2333         }
2334         case HDIO_DRIVE_CMD:
2335         {
2336                 u8 drive_command[4];
2337
2338                 /* Copy the user command info to our buffer. */
2339                 if (copy_from_user(drive_command,
2340                                          (void __user *) arg,
2341                                          sizeof(drive_command)))
2342                         return -EFAULT;
2343
2344                 /* Execute the drive command. */
2345                 if (exec_drive_command(dd->port,
2346                                          drive_command,
2347                                          (void __user *) (arg+4)))
2348                         return -EIO;
2349
2350                 /* Copy the status back to the users buffer. */
2351                 if (copy_to_user((void __user *) arg,
2352                                          drive_command,
2353                                          sizeof(drive_command)))
2354                         return -EFAULT;
2355
2356                 break;
2357         }
2358         case HDIO_DRIVE_TASK:
2359         {
2360                 u8 drive_command[7];
2361
2362                 /* Copy the user command info to our buffer. */
2363                 if (copy_from_user(drive_command,
2364                                          (void __user *) arg,
2365                                          sizeof(drive_command)))
2366                         return -EFAULT;
2367
2368                 /* Execute the drive command. */
2369                 if (exec_drive_task(dd->port, drive_command))
2370                         return -EIO;
2371
2372                 /* Copy the status back to the users buffer. */
2373                 if (copy_to_user((void __user *) arg,
2374                                          drive_command,
2375                                          sizeof(drive_command)))
2376                         return -EFAULT;
2377
2378                 break;
2379         }
2380         case HDIO_DRIVE_TASKFILE: {
2381                 ide_task_request_t req_task;
2382                 int ret, outtotal;
2383
2384                 if (copy_from_user(&req_task, (void __user *) arg,
2385                                         sizeof(req_task)))
2386                         return -EFAULT;
2387
2388                 outtotal = sizeof(req_task);
2389
2390                 ret = exec_drive_taskfile(dd, (void __user *) arg,
2391                                                 &req_task, outtotal);
2392
2393                 if (copy_to_user((void __user *) arg, &req_task,
2394                                                         sizeof(req_task)))
2395                         return -EFAULT;
2396
2397                 return ret;
2398         }
2399
2400         default:
2401                 return -EINVAL;
2402         }
2403         return 0;
2404 }
2405
2406 /*
2407  * Submit an IO to the hw
2408  *
2409  * This function is called by the block layer to issue an io
2410  * to the device. Upon completion, the callback function will
2411  * be called with the data parameter passed as the callback data.
2412  *
2413  * @dd       Pointer to the driver data structure.
2414  * @start    First sector to read.
2415  * @nsect    Number of sectors to read.
2416  * @nents    Number of entries in scatter list for the read command.
2417  * @tag      The tag of this read command.
2418  * @callback Pointer to the function that should be called
2419  *           when the read completes.
2420  * @data     Callback data passed to the callback function
2421  *           when the read completes.
2422  * @dir      Direction (read or write)
2423  *
2424  * return value
2425  *      None
2426  */
2427 static void mtip_hw_submit_io(struct driver_data *dd, sector_t start,
2428                               int nsect, int nents, int tag, void *callback,
2429                               void *data, int dir)
2430 {
2431         struct host_to_dev_fis  *fis;
2432         struct mtip_port *port = dd->port;
2433         struct mtip_cmd *command = &port->commands[tag];
2434         int dma_dir = (dir == READ) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2435
2436         /* Map the scatter list for DMA access */
2437         nents = dma_map_sg(&dd->pdev->dev, command->sg, nents, dma_dir);
2438
2439         command->scatter_ents = nents;
2440
2441         /*
2442          * The number of retries for this command before it is
2443          * reported as a failure to the upper layers.
2444          */
2445         command->retries = MTIP_MAX_RETRIES;
2446
2447         /* Fill out fis */
2448         fis = command->command;
2449         fis->type        = 0x27;
2450         fis->opts        = 1 << 7;
2451         fis->command     =
2452                 (dir == READ ? ATA_CMD_FPDMA_READ : ATA_CMD_FPDMA_WRITE);
2453         *((unsigned int *) &fis->lba_low) = (start & 0xFFFFFF);
2454         *((unsigned int *) &fis->lba_low_ex) = ((start >> 24) & 0xFFFFFF);
2455         fis->device      = 1 << 6;
2456         fis->features    = nsect & 0xFF;
2457         fis->features_ex = (nsect >> 8) & 0xFF;
2458         fis->sect_count  = ((tag << 3) | (tag >> 5));
2459         fis->sect_cnt_ex = 0;
2460         fis->control     = 0;
2461         fis->res2        = 0;
2462         fis->res3        = 0;
2463         fill_command_sg(dd, command, nents);
2464
2465         /* Populate the command header */
2466         command->command_header->opts =
2467                         __force_bit2int cpu_to_le32(
2468                                 (nents << 16) | 5 | AHCI_CMD_PREFETCH);
2469         command->command_header->byte_count = 0;
2470
2471         /*
2472          * Set the completion function and data for the command
2473          * within this layer.
2474          */
2475         command->comp_data = dd;
2476         command->comp_func = mtip_async_complete;
2477         command->direction = dma_dir;
2478
2479         /*
2480          * Set the completion function and data for the command passed
2481          * from the upper layer.
2482          */
2483         command->async_data = data;
2484         command->async_callback = callback;
2485
2486         /*
2487          * To prevent this command from being issued
2488          * if an internal command is in progress or error handling is active.
2489          */
2490         if (port->flags & MTIP_PF_PAUSE_IO) {
2491                 set_bit(tag, port->cmds_to_issue);
2492                 set_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2493                 return;
2494         }
2495
2496         /* Issue the command to the hardware */
2497         mtip_issue_ncq_command(port, tag);
2498
2499         return;
2500 }
2501
2502 /*
2503  * Release a command slot.
2504  *
2505  * @dd  Pointer to the driver data structure.
2506  * @tag Slot tag
2507  *
2508  * return value
2509  *      None
2510  */
2511 static void mtip_hw_release_scatterlist(struct driver_data *dd, int tag)
2512 {
2513         release_slot(dd->port, tag);
2514 }
2515
2516 /*
2517  * Obtain a command slot and return its associated scatter list.
2518  *
2519  * @dd  Pointer to the driver data structure.
2520  * @tag Pointer to an int that will receive the allocated command
2521  *            slot tag.
2522  *
2523  * return value
2524  *      Pointer to the scatter list for the allocated command slot
2525  *      or NULL if no command slots are available.
2526  */
2527 static struct scatterlist *mtip_hw_get_scatterlist(struct driver_data *dd,
2528                                                    int *tag)
2529 {
2530         /*
2531          * It is possible that, even with this semaphore, a thread
2532          * may think that no command slots are available. Therefore, we
2533          * need to make an attempt to get_slot().
2534          */
2535         down(&dd->port->cmd_slot);
2536         *tag = get_slot(dd->port);
2537
2538         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
2539                 up(&dd->port->cmd_slot);
2540                 return NULL;
2541         }
2542         if (unlikely(*tag < 0)) {
2543                 up(&dd->port->cmd_slot);
2544                 return NULL;
2545         }
2546
2547         return dd->port->commands[*tag].sg;
2548 }
2549
2550 /*
2551  * Sysfs status dump.
2552  *
2553  * @dev  Pointer to the device structure, passed by the kernrel.
2554  * @attr Pointer to the device_attribute structure passed by the kernel.
2555  * @buf  Pointer to the char buffer that will receive the stats info.
2556  *
2557  * return value
2558  *      The size, in bytes, of the data copied into buf.
2559  */
2560 static ssize_t mtip_hw_show_status(struct device *dev,
2561                                 struct device_attribute *attr,
2562                                 char *buf)
2563 {
2564         struct driver_data *dd = dev_to_disk(dev)->private_data;
2565         int size = 0;
2566
2567         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
2568                 size += sprintf(buf, "%s", "thermal_shutdown\n");
2569         else if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag))
2570                 size += sprintf(buf, "%s", "write_protect\n");
2571         else
2572                 size += sprintf(buf, "%s", "online\n");
2573
2574         return size;
2575 }
2576
2577 static DEVICE_ATTR(status, S_IRUGO, mtip_hw_show_status, NULL);
2578
2579 static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
2580                                   size_t len, loff_t *offset)
2581 {
2582         struct driver_data *dd =  (struct driver_data *)f->private_data;
2583         char buf[MTIP_DFS_MAX_BUF_SIZE];
2584         u32 group_allocated;
2585         int size = *offset;
2586         int n;
2587
2588         if (!len || size)
2589                 return 0;
2590
2591         if (size < 0)
2592                 return -EINVAL;
2593
2594         size += sprintf(&buf[size], "H/ S ACTive      : [ 0x");
2595
2596         for (n = dd->slot_groups-1; n >= 0; n--)
2597                 size += sprintf(&buf[size], "%08X ",
2598                                          readl(dd->port->s_active[n]));
2599
2600         size += sprintf(&buf[size], "]\n");
2601         size += sprintf(&buf[size], "H/ Command Issue : [ 0x");
2602
2603         for (n = dd->slot_groups-1; n >= 0; n--)
2604                 size += sprintf(&buf[size], "%08X ",
2605                                         readl(dd->port->cmd_issue[n]));
2606
2607         size += sprintf(&buf[size], "]\n");
2608         size += sprintf(&buf[size], "H/ Completed     : [ 0x");
2609
2610         for (n = dd->slot_groups-1; n >= 0; n--)
2611                 size += sprintf(&buf[size], "%08X ",
2612                                 readl(dd->port->completed[n]));
2613
2614         size += sprintf(&buf[size], "]\n");
2615         size += sprintf(&buf[size], "H/ PORT IRQ STAT : [ 0x%08X ]\n",
2616                                 readl(dd->port->mmio + PORT_IRQ_STAT));
2617         size += sprintf(&buf[size], "H/ HOST IRQ STAT : [ 0x%08X ]\n",
2618                                 readl(dd->mmio + HOST_IRQ_STAT));
2619         size += sprintf(&buf[size], "\n");
2620
2621         size += sprintf(&buf[size], "L/ Allocated     : [ 0x");
2622
2623         for (n = dd->slot_groups-1; n >= 0; n--) {
2624                 if (sizeof(long) > sizeof(u32))
2625                         group_allocated =
2626                                 dd->port->allocated[n/2] >> (32*(n&1));
2627                 else
2628                         group_allocated = dd->port->allocated[n];
2629                 size += sprintf(&buf[size], "%08X ", group_allocated);
2630         }
2631         size += sprintf(&buf[size], "]\n");
2632
2633         size += sprintf(&buf[size], "L/ Commands in Q : [ 0x");
2634
2635         for (n = dd->slot_groups-1; n >= 0; n--) {
2636                 if (sizeof(long) > sizeof(u32))
2637                         group_allocated =
2638                                 dd->port->cmds_to_issue[n/2] >> (32*(n&1));
2639                 else
2640                         group_allocated = dd->port->cmds_to_issue[n];
2641                 size += sprintf(&buf[size], "%08X ", group_allocated);
2642         }
2643         size += sprintf(&buf[size], "]\n");
2644
2645         *offset = size <= len ? size : len;
2646         size = copy_to_user(ubuf, buf, *offset);
2647         if (size)
2648                 return -EFAULT;
2649
2650         return *offset;
2651 }
2652
2653 static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
2654                                   size_t len, loff_t *offset)
2655 {
2656         struct driver_data *dd =  (struct driver_data *)f->private_data;
2657         char buf[MTIP_DFS_MAX_BUF_SIZE];
2658         int size = *offset;
2659
2660         if (!len || size)
2661                 return 0;
2662
2663         if (size < 0)
2664                 return -EINVAL;
2665
2666         size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
2667                                                         dd->port->flags);
2668         size += sprintf(&buf[size], "Flag-dd   : [ %08lX ]\n",
2669                                                         dd->dd_flag);
2670
2671         *offset = size <= len ? size : len;
2672         size = copy_to_user(ubuf, buf, *offset);
2673         if (size)
2674                 return -EFAULT;
2675
2676         return *offset;
2677 }
2678
2679 static const struct file_operations mtip_regs_fops = {
2680         .owner  = THIS_MODULE,
2681         .open   = simple_open,
2682         .read   = mtip_hw_read_registers,
2683         .llseek = no_llseek,
2684 };
2685
2686 static const struct file_operations mtip_flags_fops = {
2687         .owner  = THIS_MODULE,
2688         .open   = simple_open,
2689         .read   = mtip_hw_read_flags,
2690         .llseek = no_llseek,
2691 };
2692
2693 /*
2694  * Create the sysfs related attributes.
2695  *
2696  * @dd   Pointer to the driver data structure.
2697  * @kobj Pointer to the kobj for the block device.
2698  *
2699  * return value
2700  *      0       Operation completed successfully.
2701  *      -EINVAL Invalid parameter.
2702  */
2703 static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
2704 {
2705         if (!kobj || !dd)
2706                 return -EINVAL;
2707
2708         if (sysfs_create_file(kobj, &dev_attr_status.attr))
2709                 dev_warn(&dd->pdev->dev,
2710                         "Error creating 'status' sysfs entry\n");
2711         return 0;
2712 }
2713
2714 /*
2715  * Remove the sysfs related attributes.
2716  *
2717  * @dd   Pointer to the driver data structure.
2718  * @kobj Pointer to the kobj for the block device.
2719  *
2720  * return value
2721  *      0       Operation completed successfully.
2722  *      -EINVAL Invalid parameter.
2723  */
2724 static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
2725 {
2726         if (!kobj || !dd)
2727                 return -EINVAL;
2728
2729         sysfs_remove_file(kobj, &dev_attr_status.attr);
2730
2731         return 0;
2732 }
2733
2734 static int mtip_hw_debugfs_init(struct driver_data *dd)
2735 {
2736         if (!dfs_parent)
2737                 return -1;
2738
2739         dd->dfs_node = debugfs_create_dir(dd->disk->disk_name, dfs_parent);
2740         if (IS_ERR_OR_NULL(dd->dfs_node)) {
2741                 dev_warn(&dd->pdev->dev,
2742                         "Error creating node %s under debugfs\n",
2743                                                 dd->disk->disk_name);
2744                 dd->dfs_node = NULL;
2745                 return -1;
2746         }
2747
2748         debugfs_create_file("flags", S_IRUGO, dd->dfs_node, dd,
2749                                                         &mtip_flags_fops);
2750         debugfs_create_file("registers", S_IRUGO, dd->dfs_node, dd,
2751                                                         &mtip_regs_fops);
2752
2753         return 0;
2754 }
2755
2756 static void mtip_hw_debugfs_exit(struct driver_data *dd)
2757 {
2758         debugfs_remove_recursive(dd->dfs_node);
2759 }
2760
2761
2762 /*
2763  * Perform any init/resume time hardware setup
2764  *
2765  * @dd Pointer to the driver data structure.
2766  *
2767  * return value
2768  *      None
2769  */
2770 static inline void hba_setup(struct driver_data *dd)
2771 {
2772         u32 hwdata;
2773         hwdata = readl(dd->mmio + HOST_HSORG);
2774
2775         /* interrupt bug workaround: use only 1 IS bit.*/
2776         writel(hwdata |
2777                 HSORG_DISABLE_SLOTGRP_INTR |
2778                 HSORG_DISABLE_SLOTGRP_PXIS,
2779                 dd->mmio + HOST_HSORG);
2780 }
2781
2782 /*
2783  * Detect the details of the product, and store anything needed
2784  * into the driver data structure.  This includes product type and
2785  * version and number of slot groups.
2786  *
2787  * @dd Pointer to the driver data structure.
2788  *
2789  * return value
2790  *      None
2791  */
2792 static void mtip_detect_product(struct driver_data *dd)
2793 {
2794         u32 hwdata;
2795         unsigned int rev, slotgroups;
2796
2797         /*
2798          * HBA base + 0xFC [15:0] - vendor-specific hardware interface
2799          * info register:
2800          * [15:8] hardware/software interface rev#
2801          * [   3] asic-style interface
2802          * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
2803          */
2804         hwdata = readl(dd->mmio + HOST_HSORG);
2805
2806         dd->product_type = MTIP_PRODUCT_UNKNOWN;
2807         dd->slot_groups = 1;
2808
2809         if (hwdata & 0x8) {
2810                 dd->product_type = MTIP_PRODUCT_ASICFPGA;
2811                 rev = (hwdata & HSORG_HWREV) >> 8;
2812                 slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
2813                 dev_info(&dd->pdev->dev,
2814                         "ASIC-FPGA design, HS rev 0x%x, "
2815                         "%i slot groups [%i slots]\n",
2816                          rev,
2817                          slotgroups,
2818                          slotgroups * 32);
2819
2820                 if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
2821                         dev_warn(&dd->pdev->dev,
2822                                 "Warning: driver only supports "
2823                                 "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
2824                         slotgroups = MTIP_MAX_SLOT_GROUPS;
2825                 }
2826                 dd->slot_groups = slotgroups;
2827                 return;
2828         }
2829
2830         dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
2831 }
2832
2833 /*
2834  * Blocking wait for FTL rebuild to complete
2835  *
2836  * @dd Pointer to the DRIVER_DATA structure.
2837  *
2838  * return value
2839  *      0       FTL rebuild completed successfully
2840  *      -EFAULT FTL rebuild error/timeout/interruption
2841  */
2842 static int mtip_ftl_rebuild_poll(struct driver_data *dd)
2843 {
2844         unsigned long timeout, cnt = 0, start;
2845
2846         dev_warn(&dd->pdev->dev,
2847                 "FTL rebuild in progress. Polling for completion.\n");
2848
2849         start = jiffies;
2850         timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
2851
2852         do {
2853                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2854                                 &dd->dd_flag)))
2855                         return -EFAULT;
2856                 if (mtip_check_surprise_removal(dd->pdev))
2857                         return -EFAULT;
2858
2859                 if (mtip_get_identify(dd->port, NULL) < 0)
2860                         return -EFAULT;
2861
2862                 if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2863                         MTIP_FTL_REBUILD_MAGIC) {
2864                         ssleep(1);
2865                         /* Print message every 3 minutes */
2866                         if (cnt++ >= 180) {
2867                                 dev_warn(&dd->pdev->dev,
2868                                 "FTL rebuild in progress (%d secs).\n",
2869                                 jiffies_to_msecs(jiffies - start) / 1000);
2870                                 cnt = 0;
2871                         }
2872                 } else {
2873                         dev_warn(&dd->pdev->dev,
2874                                 "FTL rebuild complete (%d secs).\n",
2875                         jiffies_to_msecs(jiffies - start) / 1000);
2876                         mtip_block_initialize(dd);
2877                         return 0;
2878                 }
2879                 ssleep(10);
2880         } while (time_before(jiffies, timeout));
2881
2882         /* Check for timeout */
2883         dev_err(&dd->pdev->dev,
2884                 "Timed out waiting for FTL rebuild to complete (%d secs).\n",
2885                 jiffies_to_msecs(jiffies - start) / 1000);
2886         return -EFAULT;
2887 }
2888
2889 /*
2890  * service thread to issue queued commands
2891  *
2892  * @data Pointer to the driver data structure.
2893  *
2894  * return value
2895  *      0
2896  */
2897
2898 static int mtip_service_thread(void *data)
2899 {
2900         struct driver_data *dd = (struct driver_data *)data;
2901         unsigned long slot, slot_start, slot_wrap;
2902         unsigned int num_cmd_slots = dd->slot_groups * 32;
2903         struct mtip_port *port = dd->port;
2904
2905         while (1) {
2906                 /*
2907                  * the condition is to check neither an internal command is
2908                  * is in progress nor error handling is active
2909                  */
2910                 wait_event_interruptible(port->svc_wait, (port->flags) &&
2911                         !(port->flags & MTIP_PF_PAUSE_IO));
2912
2913                 if (kthread_should_stop())
2914                         break;
2915
2916                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2917                                 &dd->dd_flag)))
2918                         break;
2919
2920                 set_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2921                 if (test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
2922                         slot = 1;
2923                         /* used to restrict the loop to one iteration */
2924                         slot_start = num_cmd_slots;
2925                         slot_wrap = 0;
2926                         while (1) {
2927                                 slot = find_next_bit(port->cmds_to_issue,
2928                                                 num_cmd_slots, slot);
2929                                 if (slot_wrap == 1) {
2930                                         if ((slot_start >= slot) ||
2931                                                 (slot >= num_cmd_slots))
2932                                                 break;
2933                                 }
2934                                 if (unlikely(slot_start == num_cmd_slots))
2935                                         slot_start = slot;
2936
2937                                 if (unlikely(slot == num_cmd_slots)) {
2938                                         slot = 1;
2939                                         slot_wrap = 1;
2940                                         continue;
2941                                 }
2942
2943                                 /* Issue the command to the hardware */
2944                                 mtip_issue_ncq_command(port, slot);
2945
2946                                 clear_bit(slot, port->cmds_to_issue);
2947                         }
2948
2949                         clear_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2950                 } else if (test_bit(MTIP_PF_REBUILD_BIT, &port->flags)) {
2951                         if (!mtip_ftl_rebuild_poll(dd))
2952                                 set_bit(MTIP_DDF_REBUILD_FAILED_BIT,
2953                                                         &dd->dd_flag);
2954                         clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
2955                 }
2956                 clear_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2957
2958                 if (test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2959                         break;
2960         }
2961         return 0;
2962 }
2963
2964 /*
2965  * Called once for each card.
2966  *
2967  * @dd Pointer to the driver data structure.
2968  *
2969  * return value
2970  *      0 on success, else an error code.
2971  */
2972 static int mtip_hw_init(struct driver_data *dd)
2973 {
2974         int i;
2975         int rv;
2976         unsigned int num_command_slots;
2977         unsigned long timeout, timetaken;
2978         unsigned char *buf;
2979         struct smart_attr attr242;
2980
2981         dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
2982
2983         mtip_detect_product(dd);
2984         if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
2985                 rv = -EIO;
2986                 goto out1;
2987         }
2988         num_command_slots = dd->slot_groups * 32;
2989
2990         hba_setup(dd);
2991
2992         tasklet_init(&dd->tasklet, mtip_tasklet, (unsigned long)dd);
2993
2994         dd->port = kzalloc(sizeof(struct mtip_port), GFP_KERNEL);
2995         if (!dd->port) {
2996                 dev_err(&dd->pdev->dev,
2997                         "Memory allocation: port structure\n");
2998                 return -ENOMEM;
2999         }
3000
3001         /* Counting semaphore to track command slot usage */
3002         sema_init(&dd->port->cmd_slot, num_command_slots - 1);
3003
3004         /* Spinlock to prevent concurrent issue */
3005         spin_lock_init(&dd->port->cmd_issue_lock);
3006
3007         /* Set the port mmio base address. */
3008         dd->port->mmio  = dd->mmio + PORT_OFFSET;
3009         dd->port->dd    = dd;
3010
3011         /* Allocate memory for the command list. */
3012         dd->port->command_list =
3013                 dmam_alloc_coherent(&dd->pdev->dev,
3014                         HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3015                         &dd->port->command_list_dma,
3016                         GFP_KERNEL);
3017         if (!dd->port->command_list) {
3018                 dev_err(&dd->pdev->dev,
3019                         "Memory allocation: command list\n");
3020                 rv = -ENOMEM;
3021                 goto out1;
3022         }
3023
3024         /* Clear the memory we have allocated. */
3025         memset(dd->port->command_list,
3026                 0,
3027                 HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4));
3028
3029         /* Setup the addresse of the RX FIS. */
3030         dd->port->rxfis     = dd->port->command_list + HW_CMD_SLOT_SZ;
3031         dd->port->rxfis_dma = dd->port->command_list_dma + HW_CMD_SLOT_SZ;
3032
3033         /* Setup the address of the command tables. */
3034         dd->port->command_table   = dd->port->rxfis + AHCI_RX_FIS_SZ;
3035         dd->port->command_tbl_dma = dd->port->rxfis_dma + AHCI_RX_FIS_SZ;
3036
3037         /* Setup the address of the identify data. */
3038         dd->port->identify     = dd->port->command_table +
3039                                         HW_CMD_TBL_AR_SZ;
3040         dd->port->identify_dma = dd->port->command_tbl_dma +
3041                                         HW_CMD_TBL_AR_SZ;
3042
3043         /* Setup the address of the sector buffer - for some non-ncq cmds */
3044         dd->port->sector_buffer = (void *) dd->port->identify + ATA_SECT_SIZE;
3045         dd->port->sector_buffer_dma = dd->port->identify_dma + ATA_SECT_SIZE;
3046
3047         /* Setup the address of the log buf - for read log command */
3048         dd->port->log_buf = (void *)dd->port->sector_buffer  + ATA_SECT_SIZE;
3049         dd->port->log_buf_dma = dd->port->sector_buffer_dma + ATA_SECT_SIZE;
3050
3051         /* Setup the address of the smart buf - for smart read data command */
3052         dd->port->smart_buf = (void *)dd->port->log_buf  + ATA_SECT_SIZE;
3053         dd->port->smart_buf_dma = dd->port->log_buf_dma + ATA_SECT_SIZE;
3054
3055
3056         /* Point the command headers at the command tables. */
3057         for (i = 0; i < num_command_slots; i++) {
3058                 dd->port->commands[i].command_header =
3059                                         dd->port->command_list +
3060                                         (sizeof(struct mtip_cmd_hdr) * i);
3061                 dd->port->commands[i].command_header_dma =
3062                                         dd->port->command_list_dma +
3063                                         (sizeof(struct mtip_cmd_hdr) * i);
3064
3065                 dd->port->commands[i].command =
3066                         dd->port->command_table + (HW_CMD_TBL_SZ * i);
3067                 dd->port->commands[i].command_dma =
3068                         dd->port->command_tbl_dma + (HW_CMD_TBL_SZ * i);
3069
3070                 if (readl(dd->mmio + HOST_CAP) & HOST_CAP_64)
3071                         dd->port->commands[i].command_header->ctbau =
3072                         __force_bit2int cpu_to_le32(
3073                         (dd->port->commands[i].command_dma >> 16) >> 16);
3074                 dd->port->commands[i].command_header->ctba =
3075                         __force_bit2int cpu_to_le32(
3076                         dd->port->commands[i].command_dma & 0xFFFFFFFF);
3077
3078                 /*
3079                  * If this is not done, a bug is reported by the stock
3080                  * FC11 i386. Due to the fact that it has lots of kernel
3081                  * debugging enabled.
3082                  */
3083                 sg_init_table(dd->port->commands[i].sg, MTIP_MAX_SG);
3084
3085                 /* Mark all commands as currently inactive.*/
3086                 atomic_set(&dd->port->commands[i].active, 0);
3087         }
3088
3089         /* Setup the pointers to the extended s_active and CI registers. */
3090         for (i = 0; i < dd->slot_groups; i++) {
3091                 dd->port->s_active[i] =
3092                         dd->port->mmio + i*0x80 + PORT_SCR_ACT;
3093                 dd->port->cmd_issue[i] =
3094                         dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
3095                 dd->port->completed[i] =
3096                         dd->port->mmio + i*0x80 + PORT_SDBV;
3097         }
3098
3099         timetaken = jiffies;
3100         timeout = jiffies + msecs_to_jiffies(30000);
3101         while (((readl(dd->port->mmio + PORT_SCR_STAT) & 0x0F) != 0x03) &&
3102                  time_before(jiffies, timeout)) {
3103                 mdelay(100);
3104         }
3105         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
3106                 timetaken = jiffies - timetaken;
3107                 dev_warn(&dd->pdev->dev,
3108                         "Surprise removal detected at %u ms\n",
3109                         jiffies_to_msecs(timetaken));
3110                 rv = -ENODEV;
3111                 goto out2 ;
3112         }
3113         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
3114                 timetaken = jiffies - timetaken;
3115                 dev_warn(&dd->pdev->dev,
3116                         "Removal detected at %u ms\n",
3117                         jiffies_to_msecs(timetaken));
3118                 rv = -EFAULT;
3119                 goto out2;
3120         }
3121
3122         /* Conditionally reset the HBA. */
3123         if (!(readl(dd->mmio + HOST_CAP) & HOST_CAP_NZDMA)) {
3124                 if (mtip_hba_reset(dd) < 0) {
3125                         dev_err(&dd->pdev->dev,
3126                                 "Card did not reset within timeout\n");
3127                         rv = -EIO;
3128                         goto out2;
3129                 }
3130         } else {
3131                 /* Clear any pending interrupts on the HBA */
3132                 writel(readl(dd->mmio + HOST_IRQ_STAT),
3133                         dd->mmio + HOST_IRQ_STAT);
3134         }
3135
3136         mtip_init_port(dd->port);
3137         mtip_start_port(dd->port);
3138
3139         /* Setup the ISR and enable interrupts. */
3140         rv = devm_request_irq(&dd->pdev->dev,
3141                                 dd->pdev->irq,
3142                                 mtip_irq_handler,
3143                                 IRQF_SHARED,
3144                                 dev_driver_string(&dd->pdev->dev),
3145                                 dd);
3146
3147         if (rv) {
3148                 dev_err(&dd->pdev->dev,
3149                         "Unable to allocate IRQ %d\n", dd->pdev->irq);
3150                 goto out2;
3151         }
3152
3153         /* Enable interrupts on the HBA. */
3154         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3155                                         dd->mmio + HOST_CTL);
3156
3157         init_timer(&dd->port->cmd_timer);
3158         init_waitqueue_head(&dd->port->svc_wait);
3159
3160         dd->port->cmd_timer.data = (unsigned long int) dd->port;
3161         dd->port->cmd_timer.function = mtip_timeout_function;
3162         mod_timer(&dd->port->cmd_timer,
3163                 jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
3164
3165
3166         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
3167                 rv = -EFAULT;
3168                 goto out3;
3169         }
3170
3171         if (mtip_get_identify(dd->port, NULL) < 0) {
3172                 rv = -EFAULT;
3173                 goto out3;
3174         }
3175
3176         if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
3177                 MTIP_FTL_REBUILD_MAGIC) {
3178                 set_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags);
3179                 return MTIP_FTL_REBUILD_MAGIC;
3180         }
3181         mtip_dump_identify(dd->port);
3182
3183         /* check write protect, over temp and rebuild statuses */
3184         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
3185                                 dd->port->log_buf,
3186                                 dd->port->log_buf_dma, 1);
3187         if (rv) {
3188                 dev_warn(&dd->pdev->dev,
3189                         "Error in READ LOG EXT (10h) command\n");
3190                 /* non-critical error, don't fail the load */
3191         } else {
3192                 buf = (unsigned char *)dd->port->log_buf;
3193                 if (buf[259] & 0x1) {
3194                         dev_info(&dd->pdev->dev,
3195                                 "Write protect bit is set.\n");
3196                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
3197                 }
3198                 if (buf[288] == 0xF7) {
3199                         dev_info(&dd->pdev->dev,
3200                                 "Exceeded Tmax, drive in thermal shutdown.\n");
3201                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
3202                 }
3203                 if (buf[288] == 0xBF) {
3204                         dev_info(&dd->pdev->dev,
3205                                 "Drive indicates rebuild has failed.\n");
3206                         /* TODO */
3207                 }
3208         }
3209
3210         /* get write protect progess */
3211         memset(&attr242, 0, sizeof(struct smart_attr));
3212         if (mtip_get_smart_attr(dd->port, 242, &attr242))
3213                 dev_warn(&dd->pdev->dev,
3214                                 "Unable to check write protect progress\n");
3215         else
3216                 dev_info(&dd->pdev->dev,
3217                                 "Write protect progress: %d%% (%d blocks)\n",
3218                                 attr242.cur, attr242.data);
3219         return rv;
3220
3221 out3:
3222         del_timer_sync(&dd->port->cmd_timer);
3223
3224         /* Disable interrupts on the HBA. */
3225         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3226                         dd->mmio + HOST_CTL);
3227
3228         /*Release the IRQ. */
3229         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3230
3231 out2:
3232         mtip_deinit_port(dd->port);
3233
3234         /* Free the command/command header memory. */
3235         dmam_free_coherent(&dd->pdev->dev,
3236                                 HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3237                                 dd->port->command_list,
3238                                 dd->port->command_list_dma);
3239 out1:
3240         /* Free the memory allocated for the for structure. */
3241         kfree(dd->port);
3242
3243         return rv;
3244 }
3245
3246 /*
3247  * Called to deinitialize an interface.
3248  *
3249  * @dd Pointer to the driver data structure.
3250  *
3251  * return value
3252  *      0
3253  */
3254 static int mtip_hw_exit(struct driver_data *dd)
3255 {
3256         /*
3257          * Send standby immediate (E0h) to the drive so that it
3258          * saves its state.
3259          */
3260         if (!test_bit(MTIP_DDF_CLEANUP_BIT, &dd->dd_flag)) {
3261
3262                 if (!test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags))
3263                         if (mtip_standby_immediate(dd->port))
3264                                 dev_warn(&dd->pdev->dev,
3265                                         "STANDBY IMMEDIATE failed\n");
3266
3267                 /* de-initialize the port. */
3268                 mtip_deinit_port(dd->port);
3269
3270                 /* Disable interrupts on the HBA. */
3271                 writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3272                                 dd->mmio + HOST_CTL);
3273         }
3274
3275         del_timer_sync(&dd->port->cmd_timer);
3276
3277         /* Release the IRQ. */
3278         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3279
3280         /* Stop the bottom half tasklet. */
3281         tasklet_kill(&dd->tasklet);
3282
3283         /* Free the command/command header memory. */
3284         dmam_free_coherent(&dd->pdev->dev,
3285                         HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3286                         dd->port->command_list,
3287                         dd->port->command_list_dma);
3288         /* Free the memory allocated for the for structure. */
3289         kfree(dd->port);
3290
3291         return 0;
3292 }
3293
3294 /*
3295  * Issue a Standby Immediate command to the device.
3296  *
3297  * This function is called by the Block Layer just before the
3298  * system powers off during a shutdown.
3299  *
3300  * @dd Pointer to the driver data structure.
3301  *
3302  * return value
3303  *      0
3304  */
3305 static int mtip_hw_shutdown(struct driver_data *dd)
3306 {
3307         /*
3308          * Send standby immediate (E0h) to the drive so that it
3309          * saves its state.
3310          */
3311         mtip_standby_immediate(dd->port);
3312
3313         return 0;
3314 }
3315
3316 /*
3317  * Suspend function
3318  *
3319  * This function is called by the Block Layer just before the
3320  * system hibernates.
3321  *
3322  * @dd Pointer to the driver data structure.
3323  *
3324  * return value
3325  *      0       Suspend was successful
3326  *      -EFAULT Suspend was not successful
3327  */
3328 static int mtip_hw_suspend(struct driver_data *dd)
3329 {
3330         /*
3331          * Send standby immediate (E0h) to the drive
3332          * so that it saves its state.
3333          */
3334         if (mtip_standby_immediate(dd->port) != 0) {
3335                 dev_err(&dd->pdev->dev,
3336                         "Failed standby-immediate command\n");
3337                 return -EFAULT;
3338         }
3339
3340         /* Disable interrupts on the HBA.*/
3341         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3342                         dd->mmio + HOST_CTL);
3343         mtip_deinit_port(dd->port);
3344
3345         return 0;
3346 }
3347
3348 /*
3349  * Resume function
3350  *
3351  * This function is called by the Block Layer as the
3352  * system resumes.
3353  *
3354  * @dd Pointer to the driver data structure.
3355  *
3356  * return value
3357  *      0       Resume was successful
3358  *      -EFAULT Resume was not successful
3359  */
3360 static int mtip_hw_resume(struct driver_data *dd)
3361 {
3362         /* Perform any needed hardware setup steps */
3363         hba_setup(dd);
3364
3365         /* Reset the HBA */
3366         if (mtip_hba_reset(dd) != 0) {
3367                 dev_err(&dd->pdev->dev,
3368                         "Unable to reset the HBA\n");
3369                 return -EFAULT;
3370         }
3371
3372         /*
3373          * Enable the port, DMA engine, and FIS reception specific
3374          * h/w in controller.
3375          */
3376         mtip_init_port(dd->port);
3377         mtip_start_port(dd->port);
3378
3379         /* Enable interrupts on the HBA.*/
3380         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3381                         dd->mmio + HOST_CTL);
3382
3383         return 0;
3384 }
3385
3386 /*
3387  * Helper function for reusing disk name
3388  * upon hot insertion.
3389  */
3390 static int rssd_disk_name_format(char *prefix,
3391                                  int index,
3392                                  char *buf,
3393                                  int buflen)
3394 {
3395         const int base = 'z' - 'a' + 1;
3396         char *begin = buf + strlen(prefix);
3397         char *end = buf + buflen;
3398         char *p;
3399         int unit;
3400
3401         p = end - 1;
3402         *p = '\0';
3403         unit = base;
3404         do {
3405                 if (p == begin)
3406                         return -EINVAL;
3407                 *--p = 'a' + (index % unit);
3408                 index = (index / unit) - 1;
3409         } while (index >= 0);
3410
3411         memmove(begin, p, end - p);
3412         memcpy(buf, prefix, strlen(prefix));
3413
3414         return 0;
3415 }
3416
3417 /*
3418  * Block layer IOCTL handler.
3419  *
3420  * @dev Pointer to the block_device structure.
3421  * @mode ignored
3422  * @cmd IOCTL command passed from the user application.
3423  * @arg Argument passed from the user application.
3424  *
3425  * return value
3426  *      0        IOCTL completed successfully.
3427  *      -ENOTTY  IOCTL not supported or invalid driver data
3428  *                 structure pointer.
3429  */
3430 static int mtip_block_ioctl(struct block_device *dev,
3431                             fmode_t mode,
3432                             unsigned cmd,
3433                             unsigned long arg)
3434 {
3435         struct driver_data *dd = dev->bd_disk->private_data;
3436
3437         if (!capable(CAP_SYS_ADMIN))
3438                 return -EACCES;
3439
3440         if (!dd)
3441                 return -ENOTTY;
3442
3443         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3444                 return -ENOTTY;
3445
3446         switch (cmd) {
3447         case BLKFLSBUF:
3448                 return -ENOTTY;
3449         default:
3450                 return mtip_hw_ioctl(dd, cmd, arg);
3451         }
3452 }
3453
3454 #ifdef CONFIG_COMPAT
3455 /*
3456  * Block layer compat IOCTL handler.
3457  *
3458  * @dev Pointer to the block_device structure.
3459  * @mode ignored
3460  * @cmd IOCTL command passed from the user application.
3461  * @arg Argument passed from the user application.
3462  *
3463  * return value
3464  *      0        IOCTL completed successfully.
3465  *      -ENOTTY  IOCTL not supported or invalid driver data
3466  *                 structure pointer.
3467  */
3468 static int mtip_block_compat_ioctl(struct block_device *dev,
3469                             fmode_t mode,
3470                             unsigned cmd,
3471                             unsigned long arg)
3472 {
3473         struct driver_data *dd = dev->bd_disk->private_data;
3474
3475         if (!capable(CAP_SYS_ADMIN))
3476                 return -EACCES;
3477
3478         if (!dd)
3479                 return -ENOTTY;
3480
3481         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3482                 return -ENOTTY;
3483
3484         switch (cmd) {
3485         case BLKFLSBUF:
3486                 return -ENOTTY;
3487         case HDIO_DRIVE_TASKFILE: {
3488                 struct mtip_compat_ide_task_request_s __user *compat_req_task;
3489                 ide_task_request_t req_task;
3490                 int compat_tasksize, outtotal, ret;
3491
3492                 compat_tasksize =
3493                         sizeof(struct mtip_compat_ide_task_request_s);
3494
3495                 compat_req_task =
3496                         (struct mtip_compat_ide_task_request_s __user *) arg;
3497
3498                 if (copy_from_user(&req_task, (void __user *) arg,
3499                         compat_tasksize - (2 * sizeof(compat_long_t))))
3500                         return -EFAULT;
3501
3502                 if (get_user(req_task.out_size, &compat_req_task->out_size))
3503                         return -EFAULT;
3504
3505                 if (get_user(req_task.in_size, &compat_req_task->in_size))
3506                         return -EFAULT;
3507
3508                 outtotal = sizeof(struct mtip_compat_ide_task_request_s);
3509
3510                 ret = exec_drive_taskfile(dd, (void __user *) arg,
3511                                                 &req_task, outtotal);
3512
3513                 if (copy_to_user((void __user *) arg, &req_task,
3514                                 compat_tasksize -
3515                                 (2 * sizeof(compat_long_t))))
3516                         return -EFAULT;
3517
3518                 if (put_user(req_task.out_size, &compat_req_task->out_size))
3519                         return -EFAULT;
3520
3521                 if (put_user(req_task.in_size, &compat_req_task->in_size))
3522                         return -EFAULT;
3523
3524                 return ret;
3525         }
3526         default:
3527                 return mtip_hw_ioctl(dd, cmd, arg);
3528         }
3529 }
3530 #endif
3531
3532 /*
3533  * Obtain the geometry of the device.
3534  *
3535  * You may think that this function is obsolete, but some applications,
3536  * fdisk for example still used CHS values. This function describes the
3537  * device as having 224 heads and 56 sectors per cylinder. These values are
3538  * chosen so that each cylinder is aligned on a 4KB boundary. Since a
3539  * partition is described in terms of a start and end cylinder this means
3540  * that each partition is also 4KB aligned. Non-aligned partitions adversely
3541  * affects performance.
3542  *
3543  * @dev Pointer to the block_device strucutre.
3544  * @geo Pointer to a hd_geometry structure.
3545  *
3546  * return value
3547  *      0       Operation completed successfully.
3548  *      -ENOTTY An error occurred while reading the drive capacity.
3549  */
3550 static int mtip_block_getgeo(struct block_device *dev,
3551                                 struct hd_geometry *geo)
3552 {
3553         struct driver_data *dd = dev->bd_disk->private_data;
3554         sector_t capacity;
3555
3556         if (!dd)
3557                 return -ENOTTY;
3558
3559         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3560                 dev_warn(&dd->pdev->dev,
3561                         "Could not get drive capacity.\n");
3562                 return -ENOTTY;
3563         }
3564
3565         geo->heads = 224;
3566         geo->sectors = 56;
3567         sector_div(capacity, (geo->heads * geo->sectors));
3568         geo->cylinders = capacity;
3569         return 0;
3570 }
3571
3572 /*
3573  * Block device operation function.
3574  *
3575  * This structure contains pointers to the functions required by the block
3576  * layer.
3577  */
3578 static const struct block_device_operations mtip_block_ops = {
3579         .ioctl          = mtip_block_ioctl,
3580 #ifdef CONFIG_COMPAT
3581         .compat_ioctl   = mtip_block_compat_ioctl,
3582 #endif
3583         .getgeo         = mtip_block_getgeo,
3584         .owner          = THIS_MODULE
3585 };
3586
3587 /*
3588  * Block layer make request function.
3589  *
3590  * This function is called by the kernel to process a BIO for
3591  * the P320 device.
3592  *
3593  * @queue Pointer to the request queue. Unused other than to obtain
3594  *              the driver data structure.
3595  * @bio   Pointer to the BIO.
3596  *
3597  */
3598 static void mtip_make_request(struct request_queue *queue, struct bio *bio)
3599 {
3600         struct driver_data *dd = queue->queuedata;
3601         struct scatterlist *sg;
3602         struct bio_vec *bvec;
3603         int nents = 0;
3604         int tag = 0;
3605
3606         if (unlikely(dd->dd_flag & MTIP_DDF_STOP_IO)) {
3607                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
3608                                                         &dd->dd_flag))) {
3609                         bio_endio(bio, -ENXIO);
3610                         return;
3611                 }
3612                 if (unlikely(test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))) {
3613                         bio_endio(bio, -ENODATA);
3614                         return;
3615                 }
3616                 if (unlikely(test_bit(MTIP_DDF_WRITE_PROTECT_BIT,
3617                                                         &dd->dd_flag) &&
3618                                 bio_data_dir(bio))) {
3619                         bio_endio(bio, -ENODATA);
3620                         return;
3621                 }
3622         }
3623
3624         if (unlikely(!bio_has_data(bio))) {
3625                 blk_queue_flush(queue, 0);
3626                 bio_endio(bio, 0);
3627                 return;
3628         }
3629
3630         sg = mtip_hw_get_scatterlist(dd, &tag);
3631         if (likely(sg != NULL)) {
3632                 blk_queue_bounce(queue, &bio);
3633
3634                 if (unlikely((bio)->bi_vcnt > MTIP_MAX_SG)) {
3635                         dev_warn(&dd->pdev->dev,
3636                                 "Maximum number of SGL entries exceeded\n");
3637                         bio_io_error(bio);
3638                         mtip_hw_release_scatterlist(dd, tag);
3639                         return;
3640                 }
3641
3642                 /* Create the scatter list for this bio. */
3643                 bio_for_each_segment(bvec, bio, nents) {
3644                         sg_set_page(&sg[nents],
3645                                         bvec->bv_page,
3646                                         bvec->bv_len,
3647                                         bvec->bv_offset);
3648                 }
3649
3650                 /* Issue the read/write. */
3651                 mtip_hw_submit_io(dd,
3652                                 bio->bi_sector,
3653                                 bio_sectors(bio),
3654                                 nents,
3655                                 tag,
3656                                 bio_endio,
3657                                 bio,
3658                                 bio_data_dir(bio));
3659         } else
3660                 bio_io_error(bio);
3661 }
3662
3663 /*
3664  * Block layer initialization function.
3665  *
3666  * This function is called once by the PCI layer for each P320
3667  * device that is connected to the system.
3668  *
3669  * @dd Pointer to the driver data structure.
3670  *
3671  * return value
3672  *      0 on success else an error code.
3673  */
3674 static int mtip_block_initialize(struct driver_data *dd)
3675 {
3676         int rv = 0, wait_for_rebuild = 0;
3677         sector_t capacity;
3678         unsigned int index = 0;
3679         struct kobject *kobj;
3680         unsigned char thd_name[16];
3681
3682         if (dd->disk)
3683                 goto skip_create_disk; /* hw init done, before rebuild */
3684
3685         /* Initialize the protocol layer. */
3686         wait_for_rebuild = mtip_hw_init(dd);
3687         if (wait_for_rebuild < 0) {
3688                 dev_err(&dd->pdev->dev,
3689                         "Protocol layer initialization failed\n");
3690                 rv = -EINVAL;
3691                 goto protocol_init_error;
3692         }
3693
3694         dd->disk = alloc_disk(MTIP_MAX_MINORS);
3695         if (dd->disk  == NULL) {
3696                 dev_err(&dd->pdev->dev,
3697                         "Unable to allocate gendisk structure\n");
3698                 rv = -EINVAL;
3699                 goto alloc_disk_error;
3700         }
3701
3702         /* Generate the disk name, implemented same as in sd.c */
3703         do {
3704                 if (!ida_pre_get(&rssd_index_ida, GFP_KERNEL))
3705                         goto ida_get_error;
3706
3707                 spin_lock(&rssd_index_lock);
3708                 rv = ida_get_new(&rssd_index_ida, &index);
3709                 spin_unlock(&rssd_index_lock);
3710         } while (rv == -EAGAIN);
3711
3712         if (rv)
3713                 goto ida_get_error;
3714
3715         rv = rssd_disk_name_format("rssd",
3716                                 index,
3717                                 dd->disk->disk_name,
3718                                 DISK_NAME_LEN);
3719         if (rv)
3720                 goto disk_index_error;
3721
3722         dd->disk->driverfs_dev  = &dd->pdev->dev;
3723         dd->disk->major         = dd->major;
3724         dd->disk->first_minor   = dd->instance * MTIP_MAX_MINORS;
3725         dd->disk->fops          = &mtip_block_ops;
3726         dd->disk->private_data  = dd;
3727         dd->index               = index;
3728
3729         /*
3730          * if rebuild pending, start the service thread, and delay the block
3731          * queue creation and add_disk()
3732          */
3733         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3734                 goto start_service_thread;
3735
3736 skip_create_disk:
3737         /* Allocate the request queue. */
3738         dd->queue = blk_alloc_queue(GFP_KERNEL);
3739         if (dd->queue == NULL) {
3740                 dev_err(&dd->pdev->dev,
3741                         "Unable to allocate request queue\n");
3742                 rv = -ENOMEM;
3743                 goto block_queue_alloc_init_error;
3744         }
3745
3746         /* Attach our request function to the request queue. */
3747         blk_queue_make_request(dd->queue, mtip_make_request);
3748
3749         dd->disk->queue         = dd->queue;
3750         dd->queue->queuedata    = dd;
3751
3752         /* Set device limits. */
3753         set_bit(QUEUE_FLAG_NONROT, &dd->queue->queue_flags);
3754         blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
3755         blk_queue_physical_block_size(dd->queue, 4096);
3756         blk_queue_max_hw_sectors(dd->queue, 0xffff);
3757         blk_queue_max_segment_size(dd->queue, 0x400000);
3758         blk_queue_io_min(dd->queue, 4096);
3759
3760         /*
3761          * write back cache is not supported in the device. FUA depends on
3762          * write back cache support, hence setting flush support to zero.
3763          */
3764         blk_queue_flush(dd->queue, 0);
3765
3766         /* Set the capacity of the device in 512 byte sectors. */
3767         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3768                 dev_warn(&dd->pdev->dev,
3769                         "Could not read drive capacity\n");
3770                 rv = -EIO;
3771                 goto read_capacity_error;
3772         }
3773         set_capacity(dd->disk, capacity);
3774
3775         /* Enable the block device and add it to /dev */
3776         add_disk(dd->disk);
3777
3778         /*
3779          * Now that the disk is active, initialize any sysfs attributes
3780          * managed by the protocol layer.
3781          */
3782         kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
3783         if (kobj) {
3784                 mtip_hw_sysfs_init(dd, kobj);
3785                 kobject_put(kobj);
3786         }
3787         mtip_hw_debugfs_init(dd);
3788
3789         if (dd->mtip_svc_handler) {
3790                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
3791                 return rv; /* service thread created for handling rebuild */
3792         }
3793
3794 start_service_thread:
3795         sprintf(thd_name, "mtip_svc_thd_%02d", index);
3796
3797         dd->mtip_svc_handler = kthread_run(mtip_service_thread,
3798                                                 dd, thd_name);
3799
3800         if (IS_ERR(dd->mtip_svc_handler)) {
3801                 dev_err(&dd->pdev->dev, "service thread failed to start\n");
3802                 dd->mtip_svc_handler = NULL;
3803                 rv = -EFAULT;
3804                 goto kthread_run_error;
3805         }
3806
3807         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3808                 rv = wait_for_rebuild;
3809
3810         return rv;
3811
3812 kthread_run_error:
3813         mtip_hw_debugfs_exit(dd);
3814
3815         /* Delete our gendisk. This also removes the device from /dev */
3816         del_gendisk(dd->disk);
3817
3818 read_capacity_error:
3819         blk_cleanup_queue(dd->queue);
3820
3821 block_queue_alloc_init_error:
3822 disk_index_error:
3823         spin_lock(&rssd_index_lock);
3824         ida_remove(&rssd_index_ida, index);
3825         spin_unlock(&rssd_index_lock);
3826
3827 ida_get_error:
3828         put_disk(dd->disk);
3829
3830 alloc_disk_error:
3831         mtip_hw_exit(dd); /* De-initialize the protocol layer. */
3832
3833 protocol_init_error:
3834         return rv;
3835 }
3836
3837 /*
3838  * Block layer deinitialization function.
3839  *
3840  * Called by the PCI layer as each P320 device is removed.
3841  *
3842  * @dd Pointer to the driver data structure.
3843  *
3844  * return value
3845  *      0
3846  */
3847 static int mtip_block_remove(struct driver_data *dd)
3848 {
3849         struct kobject *kobj;
3850
3851         if (dd->mtip_svc_handler) {
3852                 set_bit(MTIP_PF_SVC_THD_STOP_BIT, &dd->port->flags);
3853                 wake_up_interruptible(&dd->port->svc_wait);
3854                 kthread_stop(dd->mtip_svc_handler);
3855         }
3856
3857         /* Clean up the sysfs attributes, if created */
3858         if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag)) {
3859                 kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
3860                 if (kobj) {
3861                         mtip_hw_sysfs_exit(dd, kobj);
3862                         kobject_put(kobj);
3863                 }
3864         }
3865         mtip_hw_debugfs_exit(dd);
3866
3867         /*
3868          * Delete our gendisk structure. This also removes the device
3869          * from /dev
3870          */
3871         del_gendisk(dd->disk);
3872
3873         spin_lock(&rssd_index_lock);
3874         ida_remove(&rssd_index_ida, dd->index);
3875         spin_unlock(&rssd_index_lock);
3876
3877         blk_cleanup_queue(dd->queue);
3878         dd->disk  = NULL;
3879         dd->queue = NULL;
3880
3881         /* De-initialize the protocol layer. */
3882         mtip_hw_exit(dd);
3883
3884         return 0;
3885 }
3886
3887 /*
3888  * Function called by the PCI layer when just before the
3889  * machine shuts down.
3890  *
3891  * If a protocol layer shutdown function is present it will be called
3892  * by this function.
3893  *
3894  * @dd Pointer to the driver data structure.
3895  *
3896  * return value
3897  *      0
3898  */
3899 static int mtip_block_shutdown(struct driver_data *dd)
3900 {
3901         dev_info(&dd->pdev->dev,
3902                 "Shutting down %s ...\n", dd->disk->disk_name);
3903
3904         /* Delete our gendisk structure, and cleanup the blk queue. */
3905         del_gendisk(dd->disk);
3906
3907         spin_lock(&rssd_index_lock);
3908         ida_remove(&rssd_index_ida, dd->index);
3909         spin_unlock(&rssd_index_lock);
3910
3911         blk_cleanup_queue(dd->queue);
3912         dd->disk  = NULL;
3913         dd->queue = NULL;
3914
3915         mtip_hw_shutdown(dd);
3916         return 0;
3917 }
3918
3919 static int mtip_block_suspend(struct driver_data *dd)
3920 {
3921         dev_info(&dd->pdev->dev,
3922                 "Suspending %s ...\n", dd->disk->disk_name);
3923         mtip_hw_suspend(dd);
3924         return 0;
3925 }
3926
3927 static int mtip_block_resume(struct driver_data *dd)
3928 {
3929         dev_info(&dd->pdev->dev, "Resuming %s ...\n",
3930                 dd->disk->disk_name);
3931         mtip_hw_resume(dd);
3932         return 0;
3933 }
3934
3935 /*
3936  * Called for each supported PCI device detected.
3937  *
3938  * This function allocates the private data structure, enables the
3939  * PCI device and then calls the block layer initialization function.
3940  *
3941  * return value
3942  *      0 on success else an error code.
3943  */
3944 static int mtip_pci_probe(struct pci_dev *pdev,
3945                         const struct pci_device_id *ent)
3946 {
3947         int rv = 0;
3948         struct driver_data *dd = NULL;
3949
3950         /* Allocate memory for this devices private data. */
3951         dd = kzalloc(sizeof(struct driver_data), GFP_KERNEL);
3952         if (dd == NULL) {
3953                 dev_err(&pdev->dev,
3954                         "Unable to allocate memory for driver data\n");
3955                 return -ENOMEM;
3956         }
3957
3958         /* Attach the private data to this PCI device.  */
3959         pci_set_drvdata(pdev, dd);
3960
3961         rv = pcim_enable_device(pdev);
3962         if (rv < 0) {
3963                 dev_err(&pdev->dev, "Unable to enable device\n");
3964                 goto iomap_err;
3965         }
3966
3967         /* Map BAR5 to memory. */
3968         rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME);
3969         if (rv < 0) {
3970                 dev_err(&pdev->dev, "Unable to map regions\n");
3971                 goto iomap_err;
3972         }
3973
3974         if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
3975                 rv = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
3976
3977                 if (rv) {
3978                         rv = pci_set_consistent_dma_mask(pdev,
3979                                                 DMA_BIT_MASK(32));
3980                         if (rv) {
3981                                 dev_warn(&pdev->dev,
3982                                         "64-bit DMA enable failed\n");
3983                                 goto setmask_err;
3984                         }
3985                 }
3986         }
3987
3988         pci_set_master(pdev);
3989
3990         if (pci_enable_msi(pdev)) {
3991                 dev_warn(&pdev->dev,
3992                         "Unable to enable MSI interrupt.\n");
3993                 goto block_initialize_err;
3994         }
3995
3996         /* Copy the info we may need later into the private data structure. */
3997         dd->major       = mtip_major;
3998         dd->instance    = instance;
3999         dd->pdev        = pdev;
4000
4001         /* Initialize the block layer. */
4002         rv = mtip_block_initialize(dd);
4003         if (rv < 0) {
4004                 dev_err(&pdev->dev,
4005                         "Unable to initialize block layer\n");
4006                 goto block_initialize_err;
4007         }
4008
4009         /*
4010          * Increment the instance count so that each device has a unique
4011          * instance number.
4012          */
4013         instance++;
4014         if (rv != MTIP_FTL_REBUILD_MAGIC)
4015                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4016         goto done;
4017
4018 block_initialize_err:
4019         pci_disable_msi(pdev);
4020
4021 setmask_err:
4022         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4023
4024 iomap_err:
4025         kfree(dd);
4026         pci_set_drvdata(pdev, NULL);
4027         return rv;
4028 done:
4029         return rv;
4030 }
4031
4032 /*
4033  * Called for each probed device when the device is removed or the
4034  * driver is unloaded.
4035  *
4036  * return value
4037  *      None
4038  */
4039 static void mtip_pci_remove(struct pci_dev *pdev)
4040 {
4041         struct driver_data *dd = pci_get_drvdata(pdev);
4042         int counter = 0;
4043
4044         set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
4045
4046         if (mtip_check_surprise_removal(pdev)) {
4047                 while (!test_bit(MTIP_DDF_CLEANUP_BIT, &dd->dd_flag)) {
4048                         counter++;
4049                         msleep(20);
4050                         if (counter == 10) {
4051                                 /* Cleanup the outstanding commands */
4052                                 mtip_command_cleanup(dd);
4053                                 break;
4054                         }
4055                 }
4056         }
4057
4058         /* Clean up the block layer. */
4059         mtip_block_remove(dd);
4060
4061         pci_disable_msi(pdev);
4062
4063         kfree(dd);
4064         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4065 }
4066
4067 /*
4068  * Called for each probed device when the device is suspended.
4069  *
4070  * return value
4071  *      0  Success
4072  *      <0 Error
4073  */
4074 static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
4075 {
4076         int rv = 0;
4077         struct driver_data *dd = pci_get_drvdata(pdev);
4078
4079         if (!dd) {
4080                 dev_err(&pdev->dev,
4081                         "Driver private datastructure is NULL\n");
4082                 return -EFAULT;
4083         }
4084
4085         set_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4086
4087         /* Disable ports & interrupts then send standby immediate */
4088         rv = mtip_block_suspend(dd);
4089         if (rv < 0) {
4090                 dev_err(&pdev->dev,
4091                         "Failed to suspend controller\n");
4092                 return rv;
4093         }
4094
4095         /*
4096          * Save the pci config space to pdev structure &
4097          * disable the device
4098          */
4099         pci_save_state(pdev);
4100         pci_disable_device(pdev);
4101
4102         /* Move to Low power state*/
4103         pci_set_power_state(pdev, PCI_D3hot);
4104
4105         return rv;
4106 }
4107
4108 /*
4109  * Called for each probed device when the device is resumed.
4110  *
4111  * return value
4112  *      0  Success
4113  *      <0 Error
4114  */
4115 static int mtip_pci_resume(struct pci_dev *pdev)
4116 {
4117         int rv = 0;
4118         struct driver_data *dd;
4119
4120         dd = pci_get_drvdata(pdev);
4121         if (!dd) {
4122                 dev_err(&pdev->dev,
4123                         "Driver private datastructure is NULL\n");
4124                 return -EFAULT;
4125         }
4126
4127         /* Move the device to active State */
4128         pci_set_power_state(pdev, PCI_D0);
4129
4130         /* Restore PCI configuration space */
4131         pci_restore_state(pdev);
4132
4133         /* Enable the PCI device*/
4134         rv = pcim_enable_device(pdev);
4135         if (rv < 0) {
4136                 dev_err(&pdev->dev,
4137                         "Failed to enable card during resume\n");
4138                 goto err;
4139         }
4140         pci_set_master(pdev);
4141
4142         /*
4143          * Calls hbaReset, initPort, & startPort function
4144          * then enables interrupts
4145          */
4146         rv = mtip_block_resume(dd);
4147         if (rv < 0)
4148                 dev_err(&pdev->dev, "Unable to resume\n");
4149
4150 err:
4151         clear_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4152
4153         return rv;
4154 }
4155
4156 /*
4157  * Shutdown routine
4158  *
4159  * return value
4160  *      None
4161  */
4162 static void mtip_pci_shutdown(struct pci_dev *pdev)
4163 {
4164         struct driver_data *dd = pci_get_drvdata(pdev);
4165         if (dd)
4166                 mtip_block_shutdown(dd);
4167 }
4168
4169 /* Table of device ids supported by this driver. */
4170 static DEFINE_PCI_DEVICE_TABLE(mtip_pci_tbl) = {
4171         {  PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320_DEVICE_ID) },
4172         { 0 }
4173 };
4174
4175 /* Structure that describes the PCI driver functions. */
4176 static struct pci_driver mtip_pci_driver = {
4177         .name                   = MTIP_DRV_NAME,
4178         .id_table               = mtip_pci_tbl,
4179         .probe                  = mtip_pci_probe,
4180         .remove                 = mtip_pci_remove,
4181         .suspend                = mtip_pci_suspend,
4182         .resume                 = mtip_pci_resume,
4183         .shutdown               = mtip_pci_shutdown,
4184 };
4185
4186 MODULE_DEVICE_TABLE(pci, mtip_pci_tbl);
4187
4188 /*
4189  * Module initialization function.
4190  *
4191  * Called once when the module is loaded. This function allocates a major
4192  * block device number to the Cyclone devices and registers the PCI layer
4193  * of the driver.
4194  *
4195  * Return value
4196  *      0 on success else error code.
4197  */
4198 static int __init mtip_init(void)
4199 {
4200         int error;
4201
4202         printk(KERN_INFO MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n");
4203
4204         /* Allocate a major block device number to use with this driver. */
4205         error = register_blkdev(0, MTIP_DRV_NAME);
4206         if (error <= 0) {
4207                 printk(KERN_ERR "Unable to register block device (%d)\n",
4208                 error);
4209                 return -EBUSY;
4210         }
4211         mtip_major = error;
4212
4213         if (!dfs_parent) {
4214                 dfs_parent = debugfs_create_dir("rssd", NULL);
4215                 if (IS_ERR_OR_NULL(dfs_parent)) {
4216                         printk(KERN_WARNING "Error creating debugfs parent\n");
4217                         dfs_parent = NULL;
4218                 }
4219         }
4220
4221         /* Register our PCI operations. */
4222         error = pci_register_driver(&mtip_pci_driver);
4223         if (error) {
4224                 debugfs_remove(dfs_parent);
4225                 unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4226         }
4227
4228         return error;
4229 }
4230
4231 /*
4232  * Module de-initialization function.
4233  *
4234  * Called once when the module is unloaded. This function deallocates
4235  * the major block device number allocated by mtip_init() and
4236  * unregisters the PCI layer of the driver.
4237  *
4238  * Return value
4239  *      none
4240  */
4241 static void __exit mtip_exit(void)
4242 {
4243         debugfs_remove_recursive(dfs_parent);
4244
4245         /* Release the allocated major block device number. */
4246         unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4247
4248         /* Unregister the PCI driver. */
4249         pci_unregister_driver(&mtip_pci_driver);
4250 }
4251
4252 MODULE_AUTHOR("Micron Technology, Inc");
4253 MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
4254 MODULE_LICENSE("GPL");
4255 MODULE_VERSION(MTIP_DRV_VERSION);
4256
4257 module_init(mtip_init);
4258 module_exit(mtip_exit);