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 struct list_head online_list;
  85 struct list_head removing_list;
  86 spinlock_t dev_lock;
  87
  88 /*
  89  * Global variable used to hold the major block device number
  90  * allocated in mtip_init().
  91  */
  92 static int mtip_major;
  93 static struct dentry *dfs_parent;
  94 static struct dentry *dfs_device_status;
  95
  96 static u32 cpu_use[NR_CPUS];
  97
  98 static DEFINE_SPINLOCK(rssd_index_lock);
  99 static DEFINE_IDA(rssd_index_ida);
 100
 101 static int mtip_block_initialize(struct driver_data *dd);
 102
 103 #ifdef CONFIG_COMPAT
 104 struct mtip_compat_ide_task_request_s {
 105         __u8            io_ports[8];
 106         __u8            hob_ports[8];
 107         ide_reg_valid_t out_flags;
 108         ide_reg_valid_t in_flags;
 109         int             data_phase;
 110         int             req_cmd;
 111         compat_ulong_t  out_size;
 112         compat_ulong_t  in_size;
 113 };
 114 #endif
 115
 116 /*
 117  * This function check_for_surprise_removal is called
 118  * while card is removed from the system and it will
 119  * read the vendor id from the configration space
 120  *
 121  * @pdev Pointer to the pci_dev structure.
 122  *
 123  * return value
 124  *       true if device removed, else false
 125  */
 126 static bool mtip_check_surprise_removal(struct pci_dev *pdev)
 127 {
 128         u16 vendor_id = 0;
 129
 130        /* Read the vendorID from the configuration space */
 131         pci_read_config_word(pdev, 0x00, &vendor_id);
 132         if (vendor_id == 0xFFFF)
 133                 return true; /* device removed */
 134
 135         return false; /* device present */
 136 }
 137
 138 /*
 139  * This function is called for clean the pending command in the
 140  * command slot during the surprise removal of device and return
 141  * error to the upper layer.
 142  *
 143  * @dd Pointer to the DRIVER_DATA structure.
 144  *
 145  * return value
 146  *      None
 147  */
 148 static void mtip_command_cleanup(struct driver_data *dd)
 149 {
 150         int group = 0, commandslot = 0, commandindex = 0;
 151         struct mtip_cmd *command;
 152         struct mtip_port *port = dd->port;
 153         static int in_progress;
 154
 155         if (in_progress)
 156                 return;
 157
 158         in_progress = 1;
 159
 160         for (group = 0; group < 4; group++) {
 161                 for (commandslot = 0; commandslot < 32; commandslot++) {
 162                         if (!(port->allocated[group] & (1 << commandslot)))
 163                                 continue;
 164
 165                         commandindex = group << 5 | commandslot;
 166                         command = &port->commands[commandindex];
 167
 168                         if (atomic_read(&command->active)
 169                             && (command->async_callback)) {
 170                                 command->async_callback(command->async_data,
 171                                         -ENODEV);
 172                                 command->async_callback = NULL;
 173                                 command->async_data = NULL;
 174                         }
 175
 176                         dma_unmap_sg(&port->dd->pdev->dev,
 177                                 command->sg,
 178                                 command->scatter_ents,
 179                                 command->direction);
 180                 }
 181         }
 182
 183         up(&port->cmd_slot);
 184
 185         set_bit(MTIP_DDF_CLEANUP_BIT, &dd->dd_flag);
 186         in_progress = 0;
 187 }
 188
 189 /*
 190  * Obtain an empty command slot.
 191  *
 192  * This function needs to be reentrant since it could be called
 193  * at the same time on multiple CPUs. The allocation of the
 194  * command slot must be atomic.
 195  *
 196  * @port Pointer to the port data structure.
 197  *
 198  * return value
 199  *      >= 0    Index of command slot obtained.
 200  *      -1      No command slots available.
 201  */
 202 static int get_slot(struct mtip_port *port)
 203 {
 204         int slot, i;
 205         unsigned int num_command_slots = port->dd->slot_groups * 32;
 206
 207         /*
 208          * Try 10 times, because there is a small race here.
 209          *  that's ok, because it's still cheaper than a lock.
 210          *
 211          * Race: Since this section is not protected by lock, same bit
 212          * could be chosen by different process contexts running in
 213          * different processor. So instead of costly lock, we are going
 214          * with loop.
 215          */
 216         for (i = 0; i < 10; i++) {
 217                 slot = find_next_zero_bit(port->allocated,
 218                                          num_command_slots, 1);
 219                 if ((slot < num_command_slots) &&
 220                     (!test_and_set_bit(slot, port->allocated)))
 221                         return slot;
 222         }
 223         dev_warn(&port->dd->pdev->dev, "Failed to get a tag.\n");
 224
 225         if (mtip_check_surprise_removal(port->dd->pdev)) {
 226                 /* Device not present, clean outstanding commands */
 227                 mtip_command_cleanup(port->dd);
 228         }
 229         return -1;
 230 }
 231
 232 /*
 233  * Release a command slot.
 234  *
 235  * @port Pointer to the port data structure.
 236  * @tag  Tag of command to release
 237  *
 238  * return value
 239  *      None
 240  */
 241 static inline void release_slot(struct mtip_port *port, int tag)
 242 {
 243         smp_mb__before_clear_bit();
 244         clear_bit(tag, port->allocated);
 245         smp_mb__after_clear_bit();
 246 }
 247
 248 /*
 249  * Reset the HBA (without sleeping)
 250  *
 251  * @dd Pointer to the driver data structure.
 252  *
 253  * return value
 254  *      0       The reset was successful.
 255  *      -1      The HBA Reset bit did not clear.
 256  */
 257 static int mtip_hba_reset(struct driver_data *dd)
 258 {
 259         unsigned long timeout;
 260
 261         /* Set the reset bit */
 262         writel(HOST_RESET, dd->mmio + HOST_CTL);
 263
 264         /* Flush */
 265         readl(dd->mmio + HOST_CTL);
 266
 267         /* Spin for up to 2 seconds, waiting for reset acknowledgement */
 268         timeout = jiffies + msecs_to_jiffies(2000);
 269         do {
 270                 mdelay(10);
 271                 if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))
 272                         return -1;
 273
 274         } while ((readl(dd->mmio + HOST_CTL) & HOST_RESET)
 275                  && time_before(jiffies, timeout));
 276
 277         if (readl(dd->mmio + HOST_CTL) & HOST_RESET)
 278                 return -1;
 279
 280         return 0;
 281 }
 282
 283 /*
 284  * Issue a command to the hardware.
 285  *
 286  * Set the appropriate bit in the s_active and Command Issue hardware
 287  * registers, causing hardware command processing to begin.
 288  *
 289  * @port Pointer to the port structure.
 290  * @tag  The tag of the command to be issued.
 291  *
 292  * return value
 293  *      None
 294  */
 295 static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag)
 296 {
 297         int group = tag >> 5;
 298
 299         atomic_set(&port->commands[tag].active, 1);
 300
 301         /* guard SACT and CI registers */
 302         spin_lock(&port->cmd_issue_lock[group]);
 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         spin_unlock(&port->cmd_issue_lock[group]);
 308
 309         /* Set the command's timeout value.*/
 310         port->commands[tag].comp_time = jiffies + msecs_to_jiffies(
 311                                         MTIP_NCQ_COMMAND_TIMEOUT_MS);
 312 }
 313
 314 /*
 315  * Enable/disable the reception of FIS
 316  *
 317  * @port   Pointer to the port data structure
 318  * @enable 1 to enable, 0 to disable
 319  *
 320  * return value
 321  *      Previous state: 1 enabled, 0 disabled
 322  */
 323 static int mtip_enable_fis(struct mtip_port *port, int enable)
 324 {
 325         u32 tmp;
 326
 327         /* enable FIS reception */
 328         tmp = readl(port->mmio + PORT_CMD);
 329         if (enable)
 330                 writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 331         else
 332                 writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 333
 334         /* Flush */
 335         readl(port->mmio + PORT_CMD);
 336
 337         return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX));
 338 }
 339
 340 /*
 341  * Enable/disable the DMA engine
 342  *
 343  * @port   Pointer to the port data structure
 344  * @enable 1 to enable, 0 to disable
 345  *
 346  * return value
 347  *      Previous state: 1 enabled, 0 disabled.
 348  */
 349 static int mtip_enable_engine(struct mtip_port *port, int enable)
 350 {
 351         u32 tmp;
 352
 353         /* enable FIS reception */
 354         tmp = readl(port->mmio + PORT_CMD);
 355         if (enable)
 356                 writel(tmp | PORT_CMD_START, port->mmio + PORT_CMD);
 357         else
 358                 writel(tmp & ~PORT_CMD_START, port->mmio + PORT_CMD);
 359
 360         readl(port->mmio + PORT_CMD);
 361         return (((tmp & PORT_CMD_START) == PORT_CMD_START));
 362 }
 363
 364 /*
 365  * Enables the port DMA engine and FIS reception.
 366  *
 367  * return value
 368  *      None
 369  */
 370 static inline void mtip_start_port(struct mtip_port *port)
 371 {
 372         /* Enable FIS reception */
 373         mtip_enable_fis(port, 1);
 374
 375         /* Enable the DMA engine */
 376         mtip_enable_engine(port, 1);
 377 }
 378
 379 /*
 380  * Deinitialize a port by disabling port interrupts, the DMA engine,
 381  * and FIS reception.
 382  *
 383  * @port Pointer to the port structure
 384  *
 385  * return value
 386  *      None
 387  */
 388 static inline void mtip_deinit_port(struct mtip_port *port)
 389 {
 390         /* Disable interrupts on this port */
 391         writel(0, port->mmio + PORT_IRQ_MASK);
 392
 393         /* Disable the DMA engine */
 394         mtip_enable_engine(port, 0);
 395
 396         /* Disable FIS reception */
 397         mtip_enable_fis(port, 0);
 398 }
 399
 400 /*
 401  * Initialize a port.
 402  *
 403  * This function deinitializes the port by calling mtip_deinit_port() and
 404  * then initializes it by setting the command header and RX FIS addresses,
 405  * clearing the SError register and any pending port interrupts before
 406  * re-enabling the default set of port interrupts.
 407  *
 408  * @port Pointer to the port structure.
 409  *
 410  * return value
 411  *      None
 412  */
 413 static void mtip_init_port(struct mtip_port *port)
 414 {
 415         int i;
 416         mtip_deinit_port(port);
 417
 418         /* Program the command list base and FIS base addresses */
 419         if (readl(port->dd->mmio + HOST_CAP) & HOST_CAP_64) {
 420                 writel((port->command_list_dma >> 16) >> 16,
 421                          port->mmio + PORT_LST_ADDR_HI);
 422                 writel((port->rxfis_dma >> 16) >> 16,
 423                          port->mmio + PORT_FIS_ADDR_HI);
 424         }
 425
 426         writel(port->command_list_dma & 0xFFFFFFFF,
 427                         port->mmio + PORT_LST_ADDR);
 428         writel(port->rxfis_dma & 0xFFFFFFFF, port->mmio + PORT_FIS_ADDR);
 429
 430         /* Clear SError */
 431         writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);
 432
 433         /* reset the completed registers.*/
 434         for (i = 0; i < port->dd->slot_groups; i++)
 435                 writel(0xFFFFFFFF, port->completed[i]);
 436
 437         /* Clear any pending interrupts for this port */
 438         writel(readl(port->mmio + PORT_IRQ_STAT), port->mmio + PORT_IRQ_STAT);
 439
 440         /* Clear any pending interrupts on the HBA. */
 441         writel(readl(port->dd->mmio + HOST_IRQ_STAT),
 442                                         port->dd->mmio + HOST_IRQ_STAT);
 443
 444         /* Enable port interrupts */
 445         writel(DEF_PORT_IRQ, port->mmio + PORT_IRQ_MASK);
 446 }
 447
 448 /*
 449  * Restart a port
 450  *
 451  * @port Pointer to the port data structure.
 452  *
 453  * return value
 454  *      None
 455  */
 456 static void mtip_restart_port(struct mtip_port *port)
 457 {
 458         unsigned long timeout;
 459
 460         /* Disable the DMA engine */
 461         mtip_enable_engine(port, 0);
 462
 463         /* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */
 464         timeout = jiffies + msecs_to_jiffies(500);
 465         while ((readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON)
 466                  && time_before(jiffies, timeout))
 467                 ;
 468
 469         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 470                 return;
 471
 472         /*
 473          * Chip quirk: escalate to hba reset if
 474          * PxCMD.CR not clear after 500 ms
 475          */
 476         if (readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) {
 477                 dev_warn(&port->dd->pdev->dev,
 478                         "PxCMD.CR not clear, escalating reset\n");
 479
 480                 if (mtip_hba_reset(port->dd))
 481                         dev_err(&port->dd->pdev->dev,
 482                                 "HBA reset escalation failed.\n");
 483
 484                 /* 30 ms delay before com reset to quiesce chip */
 485                 mdelay(30);
 486         }
 487
 488         dev_warn(&port->dd->pdev->dev, "Issuing COM reset\n");
 489
 490         /* Set PxSCTL.DET */
 491         writel(readl(port->mmio + PORT_SCR_CTL) |
 492                          1, port->mmio + PORT_SCR_CTL);
 493         readl(port->mmio + PORT_SCR_CTL);
 494
 495         /* Wait 1 ms to quiesce chip function */
 496         timeout = jiffies + msecs_to_jiffies(1);
 497         while (time_before(jiffies, timeout))
 498                 ;
 499
 500         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 501                 return;
 502
 503         /* Clear PxSCTL.DET */
 504         writel(readl(port->mmio + PORT_SCR_CTL) & ~1,
 505                          port->mmio + PORT_SCR_CTL);
 506         readl(port->mmio + PORT_SCR_CTL);
 507
 508         /* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */
 509         timeout = jiffies + msecs_to_jiffies(500);
 510         while (((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 511                          && time_before(jiffies, timeout))
 512                 ;
 513
 514         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 515                 return;
 516
 517         if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 518                 dev_warn(&port->dd->pdev->dev,
 519                         "COM reset failed\n");
 520
 521         mtip_init_port(port);
 522         mtip_start_port(port);
 523
 524 }
 525
 526 static int mtip_device_reset(struct driver_data *dd)
 527 {
 528         int rv = 0;
 529
 530         if (mtip_check_surprise_removal(dd->pdev))
 531                 return 0;
 532
 533         if (mtip_hba_reset(dd) < 0)
 534                 rv = -EFAULT;
 535
 536         mdelay(1);
 537         mtip_init_port(dd->port);
 538         mtip_start_port(dd->port);
 539
 540         /* Enable interrupts on the HBA. */
 541         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
 542                                         dd->mmio + HOST_CTL);
 543         return rv;
 544 }
 545
 546 /*
 547  * Helper function for tag logging
 548  */
 549 static void print_tags(struct driver_data *dd,
 550                         char *msg,
 551                         unsigned long *tagbits,
 552                         int cnt)
 553 {
 554         unsigned char tagmap[128];
 555         int group, tagmap_len = 0;
 556
 557         memset(tagmap, 0, sizeof(tagmap));
 558         for (group = SLOTBITS_IN_LONGS; group > 0; group--)
 559                 tagmap_len = sprintf(tagmap + tagmap_len, "%016lX ",
 560                                                 tagbits[group-1]);
 561         dev_warn(&dd->pdev->dev,
 562                         "%d command(s) %s: tagmap [%s]", cnt, msg, tagmap);
 563 }
 564
 565 /*
 566  * Called periodically to see if any read/write commands are
 567  * taking too long to complete.
 568  *
 569  * @data Pointer to the PORT data structure.
 570  *
 571  * return value
 572  *      None
 573  */
 574 static void mtip_timeout_function(unsigned long int data)
 575 {
 576         struct mtip_port *port = (struct mtip_port *) data;
 577         struct host_to_dev_fis *fis;
 578         struct mtip_cmd *command;
 579         int tag, cmdto_cnt = 0;
 580         unsigned int bit, group;
 581         unsigned int num_command_slots;
 582         unsigned long to, tagaccum[SLOTBITS_IN_LONGS];
 583
 584         if (unlikely(!port))
 585                 return;
 586
 587         if (test_bit(MTIP_DDF_RESUME_BIT, &port->dd->dd_flag)) {
 588                 mod_timer(&port->cmd_timer,
 589                         jiffies + msecs_to_jiffies(30000));
 590                 return;
 591         }
 592         /* clear the tag accumulator */
 593         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 594         num_command_slots = port->dd->slot_groups * 32;
 595
 596         for (tag = 0; tag < num_command_slots; tag++) {
 597                 /*
 598                  * Skip internal command slot as it has
 599                  * its own timeout mechanism
 600                  */
 601                 if (tag == MTIP_TAG_INTERNAL)
 602                         continue;
 603
 604                 if (atomic_read(&port->commands[tag].active) &&
 605                    (time_after(jiffies, port->commands[tag].comp_time))) {
 606                         group = tag >> 5;
 607                         bit = tag & 0x1F;
 608
 609                         command = &port->commands[tag];
 610                         fis = (struct host_to_dev_fis *) command->command;
 611
 612                         set_bit(tag, tagaccum);
 613                         cmdto_cnt++;
 614                         if (cmdto_cnt == 1)
 615                                 set_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
 616
 617                         /*
 618                          * Clear the completed bit. This should prevent
 619                          *  any interrupt handlers from trying to retire
 620                          *  the command.
 621                          */
 622                         writel(1 << bit, port->completed[group]);
 623
 624                         /* Call the async completion callback. */
 625                         if (likely(command->async_callback))
 626                                 command->async_callback(command->async_data,
 627                                                          -EIO);
 628                         command->async_callback = NULL;
 629                         command->comp_func = NULL;
 630
 631                         /* Unmap the DMA scatter list entries */
 632                         dma_unmap_sg(&port->dd->pdev->dev,
 633                                         command->sg,
 634                                         command->scatter_ents,
 635                                         command->direction);
 636
 637                         /*
 638                          * Clear the allocated bit and active tag for the
 639                          * command.
 640                          */
 641                         atomic_set(&port->commands[tag].active, 0);
 642                         release_slot(port, tag);
 643
 644                         up(&port->cmd_slot);
 645                 }
 646         }
 647
 648         if (cmdto_cnt) {
 649                 print_tags(port->dd, "timed out", tagaccum, cmdto_cnt);
 650                 if (!test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags)) {
 651                         mtip_device_reset(port->dd);
 652                         wake_up_interruptible(&port->svc_wait);
 653                 }
 654                 clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
 655         }
 656
 657         if (port->ic_pause_timer) {
 658                 to  = port->ic_pause_timer + msecs_to_jiffies(1000);
 659                 if (time_after(jiffies, to)) {
 660                         if (!test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags)) {
 661                                 port->ic_pause_timer = 0;
 662                                 clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
 663                                 clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
 664                                 clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
 665                                 wake_up_interruptible(&port->svc_wait);
 666                         }
 667
 668
 669                 }
 670         }
 671
 672         /* Restart the timer */
 673         mod_timer(&port->cmd_timer,
 674                 jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
 675 }
 676
 677 /*
 678  * IO completion function.
 679  *
 680  * This completion function is called by the driver ISR when a
 681  * command that was issued by the kernel completes. It first calls the
 682  * asynchronous completion function which normally calls back into the block
 683  * layer passing the asynchronous callback data, then unmaps the
 684  * scatter list associated with the completed command, and finally
 685  * clears the allocated bit associated with the completed command.
 686  *
 687  * @port   Pointer to the port data structure.
 688  * @tag    Tag of the command.
 689  * @data   Pointer to driver_data.
 690  * @status Completion status.
 691  *
 692  * return value
 693  *      None
 694  */
 695 static void mtip_async_complete(struct mtip_port *port,
 696                                 int tag,
 697                                 void *data,
 698                                 int status)
 699 {
 700         struct mtip_cmd *command;
 701         struct driver_data *dd = data;
 702         int cb_status = status ? -EIO : 0;
 703
 704         if (unlikely(!dd) || unlikely(!port))
 705                 return;
 706
 707         command = &port->commands[tag];
 708
 709         if (unlikely(status == PORT_IRQ_TF_ERR)) {
 710                 dev_warn(&port->dd->pdev->dev,
 711                         "Command tag %d failed due to TFE\n", tag);
 712         }
 713
 714         /* Upper layer callback */
 715         if (likely(command->async_callback))
 716                 command->async_callback(command->async_data, cb_status);
 717
 718         command->async_callback = NULL;
 719         command->comp_func = NULL;
 720
 721         /* Unmap the DMA scatter list entries */
 722         dma_unmap_sg(&dd->pdev->dev,
 723                 command->sg,
 724                 command->scatter_ents,
 725                 command->direction);
 726
 727         /* Clear the allocated and active bits for the command */
 728         atomic_set(&port->commands[tag].active, 0);
 729         release_slot(port, tag);
 730
 731         up(&port->cmd_slot);
 732 }
 733
 734 /*
 735  * Internal command completion callback function.
 736  *
 737  * This function is normally called by the driver ISR when an internal
 738  * command completed. This function signals the command completion by
 739  * calling complete().
 740  *
 741  * @port   Pointer to the port data structure.
 742  * @tag    Tag of the command that has completed.
 743  * @data   Pointer to a completion structure.
 744  * @status Completion status.
 745  *
 746  * return value
 747  *      None
 748  */
 749 static void mtip_completion(struct mtip_port *port,
 750                             int tag,
 751                             void *data,
 752                             int status)
 753 {
 754         struct mtip_cmd *command = &port->commands[tag];
 755         struct completion *waiting = data;
 756         if (unlikely(status == PORT_IRQ_TF_ERR))
 757                 dev_warn(&port->dd->pdev->dev,
 758                         "Internal command %d completed with TFE\n", tag);
 759
 760         command->async_callback = NULL;
 761         command->comp_func = NULL;
 762
 763         complete(waiting);
 764 }
 765
 766 static void mtip_null_completion(struct mtip_port *port,
 767                             int tag,
 768                             void *data,
 769                             int status)
 770 {
 771         return;
 772 }
 773
 774 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
 775                                 dma_addr_t buffer_dma, unsigned int sectors);
 776 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
 777                                                 struct smart_attr *attrib);
 778 /*
 779  * Handle an error.
 780  *
 781  * @dd Pointer to the DRIVER_DATA structure.
 782  *
 783  * return value
 784  *      None
 785  */
 786 static void mtip_handle_tfe(struct driver_data *dd)
 787 {
 788         int group, tag, bit, reissue, rv;
 789         struct mtip_port *port;
 790         struct mtip_cmd  *cmd;
 791         u32 completed;
 792         struct host_to_dev_fis *fis;
 793         unsigned long tagaccum[SLOTBITS_IN_LONGS];
 794         unsigned int cmd_cnt = 0;
 795         unsigned char *buf;
 796         char *fail_reason = NULL;
 797         int fail_all_ncq_write = 0, fail_all_ncq_cmds = 0;
 798
 799         dev_warn(&dd->pdev->dev, "Taskfile error\n");
 800
 801         port = dd->port;
 802
 803         /* Stop the timer to prevent command timeouts. */
 804         del_timer(&port->cmd_timer);
 805         set_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
 806
 807         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) &&
 808                         test_bit(MTIP_TAG_INTERNAL, port->allocated)) {
 809                 cmd = &port->commands[MTIP_TAG_INTERNAL];
 810                 dbg_printk(MTIP_DRV_NAME " TFE for the internal command\n");
 811
 812                 atomic_inc(&cmd->active); /* active > 1 indicates error */
 813                 if (cmd->comp_data && cmd->comp_func) {
 814                         cmd->comp_func(port, MTIP_TAG_INTERNAL,
 815                                         cmd->comp_data, PORT_IRQ_TF_ERR);
 816                 }
 817                 goto handle_tfe_exit;
 818         }
 819
 820         /* clear the tag accumulator */
 821         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 822
 823         /* Loop through all the groups */
 824         for (group = 0; group < dd->slot_groups; group++) {
 825                 completed = readl(port->completed[group]);
 826
 827                 /* clear completed status register in the hardware.*/
 828                 writel(completed, port->completed[group]);
 829
 830                 /* Process successfully completed commands */
 831                 for (bit = 0; bit < 32 && completed; bit++) {
 832                         if (!(completed & (1<<bit)))
 833                                 continue;
 834                         tag = (group << 5) + bit;
 835
 836                         /* Skip the internal command slot */
 837                         if (tag == MTIP_TAG_INTERNAL)
 838                                 continue;
 839
 840                         cmd = &port->commands[tag];
 841                         if (likely(cmd->comp_func)) {
 842                                 set_bit(tag, tagaccum);
 843                                 cmd_cnt++;
 844                                 atomic_set(&cmd->active, 0);
 845                                 cmd->comp_func(port,
 846                                          tag,
 847                                          cmd->comp_data,
 848                                          0);
 849                         } else {
 850                                 dev_err(&port->dd->pdev->dev,
 851                                         "Missing completion func for tag %d",
 852                                         tag);
 853                                 if (mtip_check_surprise_removal(dd->pdev)) {
 854                                         mtip_command_cleanup(dd);
 855                                         /* don't proceed further */
 856                                         return;
 857                                 }
 858                         }
 859                 }
 860         }
 861
 862         print_tags(dd, "completed (TFE)", tagaccum, cmd_cnt);
 863
 864         /* Restart the port */
 865         mdelay(20);
 866         mtip_restart_port(port);
 867
 868         /* Trying to determine the cause of the error */
 869         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
 870                                 dd->port->log_buf,
 871                                 dd->port->log_buf_dma, 1);
 872         if (rv) {
 873                 dev_warn(&dd->pdev->dev,
 874                         "Error in READ LOG EXT (10h) command\n");
 875                 /* non-critical error, don't fail the load */
 876         } else {
 877                 buf = (unsigned char *)dd->port->log_buf;
 878                 if (buf[259] & 0x1) {
 879                         dev_info(&dd->pdev->dev,
 880                                 "Write protect bit is set.\n");
 881                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
 882                         fail_all_ncq_write = 1;
 883                         fail_reason = "write protect";
 884                 }
 885                 if (buf[288] == 0xF7) {
 886                         dev_info(&dd->pdev->dev,
 887                                 "Exceeded Tmax, drive in thermal shutdown.\n");
 888                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
 889                         fail_all_ncq_cmds = 1;
 890                         fail_reason = "thermal shutdown";
 891                 }
 892                 if (buf[288] == 0xBF) {
 893                         dev_info(&dd->pdev->dev,
 894                                 "Drive indicates rebuild has failed.\n");
 895                         fail_all_ncq_cmds = 1;
 896                         fail_reason = "rebuild failed";
 897                 }
 898         }
 899
 900         /* clear the tag accumulator */
 901         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 902
 903         /* Loop through all the groups */
 904         for (group = 0; group < dd->slot_groups; group++) {
 905                 for (bit = 0; bit < 32; bit++) {
 906                         reissue = 1;
 907                         tag = (group << 5) + bit;
 908                         cmd = &port->commands[tag];
 909
 910                         /* If the active bit is set re-issue the command */
 911                         if (atomic_read(&cmd->active) == 0)
 912                                 continue;
 913
 914                         fis = (struct host_to_dev_fis *)cmd->command;
 915
 916                         /* Should re-issue? */
 917                         if (tag == MTIP_TAG_INTERNAL ||
 918                             fis->command == ATA_CMD_SET_FEATURES)
 919                                 reissue = 0;
 920                         else {
 921                                 if (fail_all_ncq_cmds ||
 922                                         (fail_all_ncq_write &&
 923                                         fis->command == ATA_CMD_FPDMA_WRITE)) {
 924                                         dev_warn(&dd->pdev->dev,
 925                                         "  Fail: %s w/tag %d [%s].\n",
 926                                         fis->command == ATA_CMD_FPDMA_WRITE ?
 927                                                 "write" : "read",
 928                                         tag,
 929                                         fail_reason != NULL ?
 930                                                 fail_reason : "unknown");
 931                                         atomic_set(&cmd->active, 0);
 932                                         if (cmd->comp_func) {
 933                                                 cmd->comp_func(port, tag,
 934                                                         cmd->comp_data,
 935                                                         -ENODATA);
 936                                         }
 937                                         continue;
 938                                 }
 939                         }
 940
 941                         /*
 942                          * First check if this command has
 943                          *  exceeded its retries.
 944                          */
 945                         if (reissue && (cmd->retries-- > 0)) {
 946
 947                                 set_bit(tag, tagaccum);
 948
 949                                 /* Re-issue the command. */
 950                                 mtip_issue_ncq_command(port, tag);
 951
 952                                 continue;
 953                         }
 954
 955                         /* Retire a command that will not be reissued */
 956                         dev_warn(&port->dd->pdev->dev,
 957                                 "retiring tag %d\n", tag);
 958                         atomic_set(&cmd->active, 0);
 959
 960                         if (cmd->comp_func)
 961                                 cmd->comp_func(
 962                                         port,
 963                                         tag,
 964                                         cmd->comp_data,
 965                                         PORT_IRQ_TF_ERR);
 966                         else
 967                                 dev_warn(&port->dd->pdev->dev,
 968                                         "Bad completion for tag %d\n",
 969                                         tag);
 970                 }
 971         }
 972         print_tags(dd, "reissued (TFE)", tagaccum, cmd_cnt);
 973
 974 handle_tfe_exit:
 975         /* clear eh_active */
 976         clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
 977         wake_up_interruptible(&port->svc_wait);
 978
 979         mod_timer(&port->cmd_timer,
 980                  jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
 981 }
 982
 983 /*
 984  * Handle a set device bits interrupt
 985  */
 986 static inline void mtip_workq_sdbfx(struct mtip_port *port, int group,
 987                                                         u32 completed)
 988 {
 989         struct driver_data *dd = port->dd;
 990         int tag, bit;
 991         struct mtip_cmd *command;
 992
 993         if (!completed) {
 994                 WARN_ON_ONCE(!completed);
 995                 return;
 996         }
 997         /* clear completed status register in the hardware.*/
 998         writel(completed, port->completed[group]);
 999
1000         /* Process completed commands. */
1001         for (bit = 0; (bit < 32) && completed; bit++) {
1002                 if (completed & 0x01) {
1003                         tag = (group << 5) | bit;
1004
1005                         /* skip internal command slot. */
1006                         if (unlikely(tag == MTIP_TAG_INTERNAL))
1007                                 continue;
1008
1009                         command = &port->commands[tag];
1010                         /* make internal callback */
1011                         if (likely(command->comp_func)) {
1012                                 command->comp_func(
1013                                         port,
1014                                         tag,
1015                                         command->comp_data,
1016                                         0);
1017                         } else {
1018                                 dev_warn(&dd->pdev->dev,
1019                                         "Null completion "
1020                                         "for tag %d",
1021                                         tag);
1022
1023                                 if (mtip_check_surprise_removal(
1024                                         dd->pdev)) {
1025                                         mtip_command_cleanup(dd);
1026                                         return;
1027                                 }
1028                         }
1029                 }
1030                 completed >>= 1;
1031         }
1032
1033         /* If last, re-enable interrupts */
1034         if (atomic_dec_return(&dd->irq_workers_active) == 0)
1035                 writel(0xffffffff, dd->mmio + HOST_IRQ_STAT);
1036 }
1037
1038 /*
1039  * Process legacy pio and d2h interrupts
1040  */
1041 static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat)
1042 {
1043         struct mtip_port *port = dd->port;
1044         struct mtip_cmd *cmd = &port->commands[MTIP_TAG_INTERNAL];
1045
1046         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) &&
1047             (cmd != NULL) && !(readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1048                 & (1 << MTIP_TAG_INTERNAL))) {
1049                 if (cmd->comp_func) {
1050                         cmd->comp_func(port,
1051                                 MTIP_TAG_INTERNAL,
1052                                 cmd->comp_data,
1053                                 0);
1054                         return;
1055                 }
1056         }
1057
1058         return;
1059 }
1060
1061 /*
1062  * Demux and handle errors
1063  */
1064 static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat)
1065 {
1066         if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR)))
1067                 mtip_handle_tfe(dd);
1068
1069         if (unlikely(port_stat & PORT_IRQ_CONNECT)) {
1070                 dev_warn(&dd->pdev->dev,
1071                         "Clearing PxSERR.DIAG.x\n");
1072                 writel((1 << 26), dd->port->mmio + PORT_SCR_ERR);
1073         }
1074
1075         if (unlikely(port_stat & PORT_IRQ_PHYRDY)) {
1076                 dev_warn(&dd->pdev->dev,
1077                         "Clearing PxSERR.DIAG.n\n");
1078                 writel((1 << 16), dd->port->mmio + PORT_SCR_ERR);
1079         }
1080
1081         if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) {
1082                 dev_warn(&dd->pdev->dev,
1083                         "Port stat errors %x unhandled\n",
1084                         (port_stat & ~PORT_IRQ_HANDLED));
1085         }
1086 }
1087
1088 static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
1089 {
1090         struct driver_data *dd = (struct driver_data *) data;
1091         struct mtip_port *port = dd->port;
1092         u32 hba_stat, port_stat;
1093         int rv = IRQ_NONE;
1094         int do_irq_enable = 1, i, workers;
1095         struct mtip_work *twork;
1096
1097         hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
1098         if (hba_stat) {
1099                 rv = IRQ_HANDLED;
1100
1101                 /* Acknowledge the interrupt status on the port.*/
1102                 port_stat = readl(port->mmio + PORT_IRQ_STAT);
1103                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
1104
1105                 /* Demux port status */
1106                 if (likely(port_stat & PORT_IRQ_SDB_FIS)) {
1107                         do_irq_enable = 0;
1108                         WARN_ON_ONCE(atomic_read(&dd->irq_workers_active) != 0);
1109
1110                         /* Start at 1: group zero is always local? */
1111                         for (i = 0, workers = 0; i < MTIP_MAX_SLOT_GROUPS;
1112                                                                         i++) {
1113                                 twork = &dd->work[i];
1114                                 twork->completed = readl(port->completed[i]);
1115                                 if (twork->completed)
1116                                         workers++;
1117                         }
1118
1119                         atomic_set(&dd->irq_workers_active, workers);
1120                         if (workers) {
1121                                 for (i = 1; i < MTIP_MAX_SLOT_GROUPS; i++) {
1122                                         twork = &dd->work[i];
1123                                         if (twork->completed)
1124                                                 queue_work_on(
1125                                                         twork->cpu_binding,
1126                                                         dd->isr_workq,
1127                                                         &twork->work);
1128                                 }
1129
1130                                 if (likely(dd->work[0].completed))
1131                                         mtip_workq_sdbfx(port, 0,
1132                                                         dd->work[0].completed);
1133
1134                         } else {
1135                                 /*
1136                                  * Chip quirk: SDB interrupt but nothing
1137                                  * to complete
1138                                  */
1139                                 do_irq_enable = 1;
1140                         }
1141                 }
1142
1143                 if (unlikely(port_stat & PORT_IRQ_ERR)) {
1144                         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
1145                                 mtip_command_cleanup(dd);
1146                                 /* don't proceed further */
1147                                 return IRQ_HANDLED;
1148                         }
1149                         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1150                                                         &dd->dd_flag))
1151                                 return rv;
1152
1153                         mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
1154                 }
1155
1156                 if (unlikely(port_stat & PORT_IRQ_LEGACY))
1157                         mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY);
1158         }
1159
1160         /* acknowledge interrupt */
1161         if (unlikely(do_irq_enable))
1162                 writel(hba_stat, dd->mmio + HOST_IRQ_STAT);
1163
1164         return rv;
1165 }
1166
1167 /*
1168  * HBA interrupt subroutine.
1169  *
1170  * @irq         IRQ number.
1171  * @instance    Pointer to the driver data structure.
1172  *
1173  * return value
1174  *      IRQ_HANDLED     A HBA interrupt was pending and handled.
1175  *      IRQ_NONE        This interrupt was not for the HBA.
1176  */
1177 static irqreturn_t mtip_irq_handler(int irq, void *instance)
1178 {
1179         struct driver_data *dd = instance;
1180
1181         return mtip_handle_irq(dd);
1182 }
1183
1184 static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
1185 {
1186         atomic_set(&port->commands[tag].active, 1);
1187         writel(1 << MTIP_TAG_BIT(tag),
1188                 port->cmd_issue[MTIP_TAG_INDEX(tag)]);
1189 }
1190
1191 static bool mtip_pause_ncq(struct mtip_port *port,
1192                                 struct host_to_dev_fis *fis)
1193 {
1194         struct host_to_dev_fis *reply;
1195         unsigned long task_file_data;
1196
1197         reply = port->rxfis + RX_FIS_D2H_REG;
1198         task_file_data = readl(port->mmio+PORT_TFDATA);
1199
1200         if (fis->command == ATA_CMD_SEC_ERASE_UNIT)
1201                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1202
1203         if ((task_file_data & 1))
1204                 return false;
1205
1206         if (fis->command == ATA_CMD_SEC_ERASE_PREP) {
1207                 set_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1208                 set_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1209                 port->ic_pause_timer = jiffies;
1210                 return true;
1211         } else if ((fis->command == ATA_CMD_DOWNLOAD_MICRO) &&
1212                                         (fis->features == 0x03)) {
1213                 set_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1214                 port->ic_pause_timer = jiffies;
1215                 return true;
1216         } else if ((fis->command == ATA_CMD_SEC_ERASE_UNIT) ||
1217                 ((fis->command == 0xFC) &&
1218                         (fis->features == 0x27 || fis->features == 0x72 ||
1219                          fis->features == 0x62 || fis->features == 0x26))) {
1220                 /* Com reset after secure erase or lowlevel format */
1221                 mtip_restart_port(port);
1222                 return false;
1223         }
1224
1225         return false;
1226 }
1227
1228 /*
1229  * Wait for port to quiesce
1230  *
1231  * @port    Pointer to port data structure
1232  * @timeout Max duration to wait (ms)
1233  *
1234  * return value
1235  *      0       Success
1236  *      -EBUSY  Commands still active
1237  */
1238 static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
1239 {
1240         unsigned long to;
1241         unsigned int n;
1242         unsigned int active = 1;
1243
1244         to = jiffies + msecs_to_jiffies(timeout);
1245         do {
1246                 if (test_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags) &&
1247                         test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
1248                         msleep(20);
1249                         continue; /* svc thd is actively issuing commands */
1250                 }
1251                 if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1252                         return -EFAULT;
1253                 /*
1254                  * Ignore s_active bit 0 of array element 0.
1255                  * This bit will always be set
1256                  */
1257                 active = readl(port->s_active[0]) & 0xFFFFFFFE;
1258                 for (n = 1; n < port->dd->slot_groups; n++)
1259                         active |= readl(port->s_active[n]);
1260
1261                 if (!active)
1262                         break;
1263
1264                 msleep(20);
1265         } while (time_before(jiffies, to));
1266
1267         return active ? -EBUSY : 0;
1268 }
1269
1270 /*
1271  * Execute an internal command and wait for the completion.
1272  *
1273  * @port    Pointer to the port data structure.
1274  * @fis     Pointer to the FIS that describes the command.
1275  * @fis_len  Length in WORDS of the FIS.
1276  * @buffer  DMA accessible for command data.
1277  * @buf_len  Length, in bytes, of the data buffer.
1278  * @opts    Command header options, excluding the FIS length
1279  *             and the number of PRD entries.
1280  * @timeout Time in ms to wait for the command to complete.
1281  *
1282  * return value
1283  *      0        Command completed successfully.
1284  *      -EFAULT  The buffer address is not correctly aligned.
1285  *      -EBUSY   Internal command or other IO in progress.
1286  *      -EAGAIN  Time out waiting for command to complete.
1287  */
1288 static int mtip_exec_internal_command(struct mtip_port *port,
1289                                         struct host_to_dev_fis *fis,
1290                                         int fis_len,
1291                                         dma_addr_t buffer,
1292                                         int buf_len,
1293                                         u32 opts,
1294                                         gfp_t atomic,
1295                                         unsigned long timeout)
1296 {
1297         struct mtip_cmd_sg *command_sg;
1298         DECLARE_COMPLETION_ONSTACK(wait);
1299         int rv = 0, ready2go = 1;
1300         struct mtip_cmd *int_cmd = &port->commands[MTIP_TAG_INTERNAL];
1301         unsigned long to;
1302         struct driver_data *dd = port->dd;
1303
1304         /* Make sure the buffer is 8 byte aligned. This is asic specific. */
1305         if (buffer & 0x00000007) {
1306                 dev_err(&dd->pdev->dev, "SG buffer is not 8 byte aligned\n");
1307                 return -EFAULT;
1308         }
1309
1310         to = jiffies + msecs_to_jiffies(timeout);
1311         do {
1312                 ready2go = !test_and_set_bit(MTIP_TAG_INTERNAL,
1313                                                 port->allocated);
1314                 if (ready2go)
1315                         break;
1316                 mdelay(100);
1317         } while (time_before(jiffies, to));
1318         if (!ready2go) {
1319                 dev_warn(&dd->pdev->dev,
1320                         "Internal cmd active. new cmd [%02X]\n", fis->command);
1321                 return -EBUSY;
1322         }
1323         set_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1324         port->ic_pause_timer = 0;
1325
1326         clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1327         clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1328
1329         if (atomic == GFP_KERNEL) {
1330                 if (fis->command != ATA_CMD_STANDBYNOW1) {
1331                         /* wait for io to complete if non atomic */
1332                         if (mtip_quiesce_io(port, 5000) < 0) {
1333                                 dev_warn(&dd->pdev->dev,
1334                                         "Failed to quiesce IO\n");
1335                                 release_slot(port, MTIP_TAG_INTERNAL);
1336                                 clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1337                                 wake_up_interruptible(&port->svc_wait);
1338                                 return -EBUSY;
1339                         }
1340                 }
1341
1342                 /* Set the completion function and data for the command. */
1343                 int_cmd->comp_data = &wait;
1344                 int_cmd->comp_func = mtip_completion;
1345
1346         } else {
1347                 /* Clear completion - we're going to poll */
1348                 int_cmd->comp_data = NULL;
1349                 int_cmd->comp_func = mtip_null_completion;
1350         }
1351
1352         /* Copy the command to the command table */
1353         memcpy(int_cmd->command, fis, fis_len*4);
1354
1355         /* Populate the SG list */
1356         int_cmd->command_header->opts =
1357                  __force_bit2int cpu_to_le32(opts | fis_len);
1358         if (buf_len) {
1359                 command_sg = int_cmd->command + AHCI_CMD_TBL_HDR_SZ;
1360
1361                 command_sg->info =
1362                         __force_bit2int cpu_to_le32((buf_len-1) & 0x3FFFFF);
1363                 command_sg->dba =
1364                         __force_bit2int cpu_to_le32(buffer & 0xFFFFFFFF);
1365                 command_sg->dba_upper =
1366                         __force_bit2int cpu_to_le32((buffer >> 16) >> 16);
1367
1368                 int_cmd->command_header->opts |=
1369                         __force_bit2int cpu_to_le32((1 << 16));
1370         }
1371
1372         /* Populate the command header */
1373         int_cmd->command_header->byte_count = 0;
1374
1375         /* Issue the command to the hardware */
1376         mtip_issue_non_ncq_command(port, MTIP_TAG_INTERNAL);
1377
1378         if (atomic == GFP_KERNEL) {
1379                 /* Wait for the command to complete or timeout. */
1380                 if (wait_for_completion_interruptible_timeout(
1381                                 &wait,
1382                                 msecs_to_jiffies(timeout)) <= 0) {
1383                         if (rv == -ERESTARTSYS) { /* interrupted */
1384                                 dev_err(&dd->pdev->dev,
1385                                         "Internal command [%02X] was interrupted after %lu ms\n",
1386                                         fis->command, timeout);
1387                                 rv = -EINTR;
1388                                 goto exec_ic_exit;
1389                         } else if (rv == 0) /* timeout */
1390                                 dev_err(&dd->pdev->dev,
1391                                         "Internal command did not complete [%02X] within timeout of  %lu ms\n",
1392                                         fis->command, timeout);
1393                         else
1394                                 dev_err(&dd->pdev->dev,
1395                                         "Internal command [%02X] wait returned code [%d] after %lu ms - unhandled\n",
1396                                         fis->command, rv, timeout);
1397
1398                         if (mtip_check_surprise_removal(dd->pdev) ||
1399                                 test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1400                                                 &dd->dd_flag)) {
1401                                 dev_err(&dd->pdev->dev,
1402                                         "Internal command [%02X] wait returned due to SR\n",
1403                                         fis->command);
1404                                 rv = -ENXIO;
1405                                 goto exec_ic_exit;
1406                         }
1407                         mtip_device_reset(dd); /* recover from timeout issue */
1408                         rv = -EAGAIN;
1409                         goto exec_ic_exit;
1410                 }
1411         } else {
1412                 u32 hba_stat, port_stat;
1413
1414                 /* Spin for <timeout> checking if command still outstanding */
1415                 timeout = jiffies + msecs_to_jiffies(timeout);
1416                 while ((readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1417                                 & (1 << MTIP_TAG_INTERNAL))
1418                                 && time_before(jiffies, timeout)) {
1419                         if (mtip_check_surprise_removal(dd->pdev)) {
1420                                 rv = -ENXIO;
1421                                 goto exec_ic_exit;
1422                         }
1423                         if ((fis->command != ATA_CMD_STANDBYNOW1) &&
1424                                 test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1425                                                 &dd->dd_flag)) {
1426                                 rv = -ENXIO;
1427                                 goto exec_ic_exit;
1428                         }
1429                         port_stat = readl(port->mmio + PORT_IRQ_STAT);
1430                         if (!port_stat)
1431                                 continue;
1432
1433                         if (port_stat & PORT_IRQ_ERR) {
1434                                 dev_err(&dd->pdev->dev,
1435                                         "Internal command [%02X] failed\n",
1436                                         fis->command);
1437                                 mtip_device_reset(dd);
1438                                 rv = -EIO;
1439                                 goto exec_ic_exit;
1440                         } else {
1441                                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
1442                                 hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
1443                                 if (hba_stat)
1444                                         writel(hba_stat,
1445                                                 dd->mmio + HOST_IRQ_STAT);
1446                         }
1447                         break;
1448                 }
1449         }
1450
1451         if (readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1452                         & (1 << MTIP_TAG_INTERNAL)) {
1453                 rv = -ENXIO;
1454                 if (!test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
1455                         mtip_device_reset(dd);
1456                         rv = -EAGAIN;
1457                 }
1458         }
1459 exec_ic_exit:
1460         /* Clear the allocated and active bits for the internal command. */
1461         atomic_set(&int_cmd->active, 0);
1462         release_slot(port, MTIP_TAG_INTERNAL);
1463         if (rv >= 0 && mtip_pause_ncq(port, fis)) {
1464                 /* NCQ paused */
1465                 return rv;
1466         }
1467         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1468         wake_up_interruptible(&port->svc_wait);
1469
1470         return rv;
1471 }
1472
1473 /*
1474  * Byte-swap ATA ID strings.
1475  *
1476  * ATA identify data contains strings in byte-swapped 16-bit words.
1477  * They must be swapped (on all architectures) to be usable as C strings.
1478  * This function swaps bytes in-place.
1479  *
1480  * @buf The buffer location of the string
1481  * @len The number of bytes to swap
1482  *
1483  * return value
1484  *      None
1485  */
1486 static inline void ata_swap_string(u16 *buf, unsigned int len)
1487 {
1488         int i;
1489         for (i = 0; i < (len/2); i++)
1490                 be16_to_cpus(&buf[i]);
1491 }
1492
1493 /*
1494  * Request the device identity information.
1495  *
1496  * If a user space buffer is not specified, i.e. is NULL, the
1497  * identify information is still read from the drive and placed
1498  * into the identify data buffer (@e port->identify) in the
1499  * port data structure.
1500  * When the identify buffer contains valid identify information @e
1501  * port->identify_valid is non-zero.
1502  *
1503  * @port         Pointer to the port structure.
1504  * @user_buffer  A user space buffer where the identify data should be
1505  *                    copied.
1506  *
1507  * return value
1508  *      0       Command completed successfully.
1509  *      -EFAULT An error occurred while coping data to the user buffer.
1510  *      -1      Command failed.
1511  */
1512 static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
1513 {
1514         int rv = 0;
1515         struct host_to_dev_fis fis;
1516
1517         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1518                 return -EFAULT;
1519
1520         /* Build the FIS. */
1521         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1522         fis.type        = 0x27;
1523         fis.opts        = 1 << 7;
1524         fis.command     = ATA_CMD_ID_ATA;
1525
1526         /* Set the identify information as invalid. */
1527         port->identify_valid = 0;
1528
1529         /* Clear the identify information. */
1530         memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);
1531
1532         /* Execute the command. */
1533         if (mtip_exec_internal_command(port,
1534                                 &fis,
1535                                 5,
1536                                 port->identify_dma,
1537                                 sizeof(u16) * ATA_ID_WORDS,
1538                                 0,
1539                                 GFP_KERNEL,
1540                                 MTIP_INTERNAL_COMMAND_TIMEOUT_MS)
1541                                 < 0) {
1542                 rv = -1;
1543                 goto out;
1544         }
1545
1546         /*
1547          * Perform any necessary byte-swapping.  Yes, the kernel does in fact
1548          * perform field-sensitive swapping on the string fields.
1549          * See the kernel use of ata_id_string() for proof of this.
1550          */
1551 #ifdef __LITTLE_ENDIAN
1552         ata_swap_string(port->identify + 27, 40);  /* model string*/
1553         ata_swap_string(port->identify + 23, 8);   /* firmware string*/
1554         ata_swap_string(port->identify + 10, 20);  /* serial# string*/
1555 #else
1556         {
1557                 int i;
1558                 for (i = 0; i < ATA_ID_WORDS; i++)
1559                         port->identify[i] = le16_to_cpu(port->identify[i]);
1560         }
1561 #endif
1562
1563         /* Demux ID.DRAT & ID.RZAT to determine trim support */
1564         if (port->identify[69] & (1 << 14) && port->identify[69] & (1 << 5))
1565                 port->dd->trim_supp = true;
1566         else
1567                 port->dd->trim_supp = false;
1568
1569         /* Set the identify buffer as valid. */
1570         port->identify_valid = 1;
1571
1572         if (user_buffer) {
1573                 if (copy_to_user(
1574                         user_buffer,
1575                         port->identify,
1576                         ATA_ID_WORDS * sizeof(u16))) {
1577                         rv = -EFAULT;
1578                         goto out;
1579                 }
1580         }
1581
1582 out:
1583         return rv;
1584 }
1585
1586 /*
1587  * Issue a standby immediate command to the device.
1588  *
1589  * @port Pointer to the port structure.
1590  *
1591  * return value
1592  *      0       Command was executed successfully.
1593  *      -1      An error occurred while executing the command.
1594  */
1595 static int mtip_standby_immediate(struct mtip_port *port)
1596 {
1597         int rv;
1598         struct host_to_dev_fis  fis;
1599         unsigned long start;
1600
1601         /* Build the FIS. */
1602         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1603         fis.type        = 0x27;
1604         fis.opts        = 1 << 7;
1605         fis.command     = ATA_CMD_STANDBYNOW1;
1606
1607         start = jiffies;
1608         rv = mtip_exec_internal_command(port,
1609                                         &fis,
1610                                         5,
1611                                         0,
1612                                         0,
1613                                         0,
1614                                         GFP_ATOMIC,
1615                                         15000);
1616         dbg_printk(MTIP_DRV_NAME "Time taken to complete standby cmd: %d ms\n",
1617                         jiffies_to_msecs(jiffies - start));
1618         if (rv)
1619                 dev_warn(&port->dd->pdev->dev,
1620                         "STANDBY IMMEDIATE command failed.\n");
1621
1622         return rv;
1623 }
1624
1625 /*
1626  * Issue a READ LOG EXT command to the device.
1627  *
1628  * @port        pointer to the port structure.
1629  * @page        page number to fetch
1630  * @buffer      pointer to buffer
1631  * @buffer_dma  dma address corresponding to @buffer
1632  * @sectors     page length to fetch, in sectors
1633  *
1634  * return value
1635  *      @rv     return value from mtip_exec_internal_command()
1636  */
1637 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
1638                                 dma_addr_t buffer_dma, unsigned int sectors)
1639 {
1640         struct host_to_dev_fis fis;
1641
1642         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1643         fis.type        = 0x27;
1644         fis.opts        = 1 << 7;
1645         fis.command     = ATA_CMD_READ_LOG_EXT;
1646         fis.sect_count  = sectors & 0xFF;
1647         fis.sect_cnt_ex = (sectors >> 8) & 0xFF;
1648         fis.lba_low     = page;
1649         fis.lba_mid     = 0;
1650         fis.device      = ATA_DEVICE_OBS;
1651
1652         memset(buffer, 0, sectors * ATA_SECT_SIZE);
1653
1654         return mtip_exec_internal_command(port,
1655                                         &fis,
1656                                         5,
1657                                         buffer_dma,
1658                                         sectors * ATA_SECT_SIZE,
1659                                         0,
1660                                         GFP_ATOMIC,
1661                                         MTIP_INTERNAL_COMMAND_TIMEOUT_MS);
1662 }
1663
1664 /*
1665  * Issue a SMART READ DATA command to the device.
1666  *
1667  * @port        pointer to the port structure.
1668  * @buffer      pointer to buffer
1669  * @buffer_dma  dma address corresponding to @buffer
1670  *
1671  * return value
1672  *      @rv     return value from mtip_exec_internal_command()
1673  */
1674 static int mtip_get_smart_data(struct mtip_port *port, u8 *buffer,
1675                                         dma_addr_t buffer_dma)
1676 {
1677         struct host_to_dev_fis fis;
1678
1679         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1680         fis.type        = 0x27;
1681         fis.opts        = 1 << 7;
1682         fis.command     = ATA_CMD_SMART;
1683         fis.features    = 0xD0;
1684         fis.sect_count  = 1;
1685         fis.lba_mid     = 0x4F;
1686         fis.lba_hi      = 0xC2;
1687         fis.device      = ATA_DEVICE_OBS;
1688
1689         return mtip_exec_internal_command(port,
1690                                         &fis,
1691                                         5,
1692                                         buffer_dma,
1693                                         ATA_SECT_SIZE,
1694                                         0,
1695                                         GFP_ATOMIC,
1696                                         15000);
1697 }
1698
1699 /*
1700  * Get the value of a smart attribute
1701  *
1702  * @port        pointer to the port structure
1703  * @id          attribute number
1704  * @attrib      pointer to return attrib information corresponding to @id
1705  *
1706  * return value
1707  *      -EINVAL NULL buffer passed or unsupported attribute @id.
1708  *      -EPERM  Identify data not valid, SMART not supported or not enabled
1709  */
1710 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
1711                                                 struct smart_attr *attrib)
1712 {
1713         int rv, i;
1714         struct smart_attr *pattr;
1715
1716         if (!attrib)
1717                 return -EINVAL;
1718
1719         if (!port->identify_valid) {
1720                 dev_warn(&port->dd->pdev->dev, "IDENTIFY DATA not valid\n");
1721                 return -EPERM;
1722         }
1723         if (!(port->identify[82] & 0x1)) {
1724                 dev_warn(&port->dd->pdev->dev, "SMART not supported\n");
1725                 return -EPERM;
1726         }
1727         if (!(port->identify[85] & 0x1)) {
1728                 dev_warn(&port->dd->pdev->dev, "SMART not enabled\n");
1729                 return -EPERM;
1730         }
1731
1732         memset(port->smart_buf, 0, ATA_SECT_SIZE);
1733         rv = mtip_get_smart_data(port, port->smart_buf, port->smart_buf_dma);
1734         if (rv) {
1735                 dev_warn(&port->dd->pdev->dev, "Failed to ge SMART data\n");
1736                 return rv;
1737         }
1738
1739         pattr = (struct smart_attr *)(port->smart_buf + 2);
1740         for (i = 0; i < 29; i++, pattr++)
1741                 if (pattr->attr_id == id) {
1742                         memcpy(attrib, pattr, sizeof(struct smart_attr));
1743                         break;
1744                 }
1745
1746         if (i == 29) {
1747                 dev_warn(&port->dd->pdev->dev,
1748                         "Query for invalid SMART attribute ID\n");
1749                 rv = -EINVAL;
1750         }
1751
1752         return rv;
1753 }
1754
1755 /*
1756  * Trim unused sectors
1757  *
1758  * @dd          pointer to driver_data structure
1759  * @lba         starting lba
1760  * @len         # of 512b sectors to trim
1761  *
1762  * return value
1763  *      -ENOMEM         Out of dma memory
1764  *      -EINVAL         Invalid parameters passed in, trim not supported
1765  *      -EIO            Error submitting trim request to hw
1766  */
1767 static int mtip_send_trim(struct driver_data *dd, unsigned int lba,
1768                                 unsigned int len)
1769 {
1770         int i, rv = 0;
1771         u64 tlba, tlen, sect_left;
1772         struct mtip_trim_entry *buf;
1773         dma_addr_t dma_addr;
1774         struct host_to_dev_fis fis;
1775
1776         if (!len || dd->trim_supp == false)
1777                 return -EINVAL;
1778
1779         /* Trim request too big */
1780         WARN_ON(len > (MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES));
1781
1782         /* Trim request not aligned on 4k boundary */
1783         WARN_ON(len % 8 != 0);
1784
1785         /* Warn if vu_trim structure is too big */
1786         WARN_ON(sizeof(struct mtip_trim) > ATA_SECT_SIZE);
1787
1788         /* Allocate a DMA buffer for the trim structure */
1789         buf = dmam_alloc_coherent(&dd->pdev->dev, ATA_SECT_SIZE, &dma_addr,
1790                                                                 GFP_KERNEL);
1791         if (!buf)
1792                 return -ENOMEM;
1793         memset(buf, 0, ATA_SECT_SIZE);
1794
1795         for (i = 0, sect_left = len, tlba = lba;
1796                         i < MTIP_MAX_TRIM_ENTRIES && sect_left;
1797                         i++) {
1798                 tlen = (sect_left >= MTIP_MAX_TRIM_ENTRY_LEN ?
1799                                         MTIP_MAX_TRIM_ENTRY_LEN :
1800                                         sect_left);
1801                 buf[i].lba = __force_bit2int cpu_to_le32(tlba);
1802                 buf[i].range = __force_bit2int cpu_to_le16(tlen);
1803                 tlba += tlen;
1804                 sect_left -= tlen;
1805         }
1806         WARN_ON(sect_left != 0);
1807
1808         /* Build the fis */
1809         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1810         fis.type       = 0x27;
1811         fis.opts       = 1 << 7;
1812         fis.command    = 0xfb;
1813         fis.features   = 0x60;
1814         fis.sect_count = 1;
1815         fis.device     = ATA_DEVICE_OBS;
1816
1817         if (mtip_exec_internal_command(dd->port,
1818                                         &fis,
1819                                         5,
1820                                         dma_addr,
1821                                         ATA_SECT_SIZE,
1822                                         0,
1823                                         GFP_KERNEL,
1824                                         MTIP_TRIM_TIMEOUT_MS) < 0)
1825                 rv = -EIO;
1826
1827         dmam_free_coherent(&dd->pdev->dev, ATA_SECT_SIZE, buf, dma_addr);
1828         return rv;
1829 }
1830
1831 /*
1832  * Get the drive capacity.
1833  *
1834  * @dd      Pointer to the device data structure.
1835  * @sectors Pointer to the variable that will receive the sector count.
1836  *
1837  * return value
1838  *      1 Capacity was returned successfully.
1839  *      0 The identify information is invalid.
1840  */
1841 static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
1842 {
1843         struct mtip_port *port = dd->port;
1844         u64 total, raw0, raw1, raw2, raw3;
1845         raw0 = port->identify[100];
1846         raw1 = port->identify[101];
1847         raw2 = port->identify[102];
1848         raw3 = port->identify[103];
1849         total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
1850         *sectors = total;
1851         return (bool) !!port->identify_valid;
1852 }
1853
1854 /*
1855  * Display the identify command data.
1856  *
1857  * @port Pointer to the port data structure.
1858  *
1859  * return value
1860  *      None
1861  */
1862 static void mtip_dump_identify(struct mtip_port *port)
1863 {
1864         sector_t sectors;
1865         unsigned short revid;
1866         char cbuf[42];
1867
1868         if (!port->identify_valid)
1869                 return;
1870
1871         strlcpy(cbuf, (char *)(port->identify+10), 21);
1872         dev_info(&port->dd->pdev->dev,
1873                 "Serial No.: %s\n", cbuf);
1874
1875         strlcpy(cbuf, (char *)(port->identify+23), 9);
1876         dev_info(&port->dd->pdev->dev,
1877                 "Firmware Ver.: %s\n", cbuf);
1878
1879         strlcpy(cbuf, (char *)(port->identify+27), 41);
1880         dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);
1881
1882         if (mtip_hw_get_capacity(port->dd, &sectors))
1883                 dev_info(&port->dd->pdev->dev,
1884                         "Capacity: %llu sectors (%llu MB)\n",
1885                          (u64)sectors,
1886                          ((u64)sectors) * ATA_SECT_SIZE >> 20);
1887
1888         pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
1889         switch (revid & 0xFF) {
1890         case 0x1:
1891                 strlcpy(cbuf, "A0", 3);
1892                 break;
1893         case 0x3:
1894                 strlcpy(cbuf, "A2", 3);
1895                 break;
1896         default:
1897                 strlcpy(cbuf, "?", 2);
1898                 break;
1899         }
1900         dev_info(&port->dd->pdev->dev,
1901                 "Card Type: %s\n", cbuf);
1902 }
1903
1904 /*
1905  * Map the commands scatter list into the command table.
1906  *
1907  * @command Pointer to the command.
1908  * @nents Number of scatter list entries.
1909  *
1910  * return value
1911  *      None
1912  */
1913 static inline void fill_command_sg(struct driver_data *dd,
1914                                 struct mtip_cmd *command,
1915                                 int nents)
1916 {
1917         int n;
1918         unsigned int dma_len;
1919         struct mtip_cmd_sg *command_sg;
1920         struct scatterlist *sg = command->sg;
1921
1922         command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
1923
1924         for (n = 0; n < nents; n++) {
1925                 dma_len = sg_dma_len(sg);
1926                 if (dma_len > 0x400000)
1927                         dev_err(&dd->pdev->dev,
1928                                 "DMA segment length truncated\n");
1929                 command_sg->info = __force_bit2int
1930                         cpu_to_le32((dma_len-1) & 0x3FFFFF);
1931                 command_sg->dba = __force_bit2int
1932                         cpu_to_le32(sg_dma_address(sg));
1933                 command_sg->dba_upper = __force_bit2int
1934                         cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
1935                 command_sg++;
1936                 sg++;
1937         }
1938 }
1939
1940 /*
1941  * @brief Execute a drive command.
1942  *
1943  * return value 0 The command completed successfully.
1944  * return value -1 An error occurred while executing the command.
1945  */
1946 static int exec_drive_task(struct mtip_port *port, u8 *command)
1947 {
1948         struct host_to_dev_fis  fis;
1949         struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
1950
1951         /* Build the FIS. */
1952         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1953         fis.type        = 0x27;
1954         fis.opts        = 1 << 7;
1955         fis.command     = command[0];
1956         fis.features    = command[1];
1957         fis.sect_count  = command[2];
1958         fis.sector      = command[3];
1959         fis.cyl_low     = command[4];
1960         fis.cyl_hi      = command[5];
1961         fis.device      = command[6] & ~0x10; /* Clear the dev bit*/
1962
1963         dbg_printk(MTIP_DRV_NAME " %s: User Command: cmd %x, feat %x, nsect %x, sect %x, lcyl %x, hcyl %x, sel %x\n",
1964                 __func__,
1965                 command[0],
1966                 command[1],
1967                 command[2],
1968                 command[3],
1969                 command[4],
1970                 command[5],
1971                 command[6]);
1972
1973         /* Execute the command. */
1974         if (mtip_exec_internal_command(port,
1975                                  &fis,
1976                                  5,
1977                                  0,
1978                                  0,
1979                                  0,
1980                                  GFP_KERNEL,
1981                                  MTIP_IOCTL_COMMAND_TIMEOUT_MS) < 0) {
1982                 return -1;
1983         }
1984
1985         command[0] = reply->command; /* Status*/
1986         command[1] = reply->features; /* Error*/
1987         command[4] = reply->cyl_low;
1988         command[5] = reply->cyl_hi;
1989
1990         dbg_printk(MTIP_DRV_NAME " %s: Completion Status: stat %x, err %x , cyl_lo %x cyl_hi %x\n",
1991                 __func__,
1992                 command[0],
1993                 command[1],
1994                 command[4],
1995                 command[5]);
1996
1997         return 0;
1998 }
1999
2000 /*
2001  * @brief Execute a drive command.
2002  *
2003  * @param port Pointer to the port data structure.
2004  * @param command Pointer to the user specified command parameters.
2005  * @param user_buffer Pointer to the user space buffer where read sector
2006  *                   data should be copied.
2007  *
2008  * return value 0 The command completed successfully.
2009  * return value -EFAULT An error occurred while copying the completion
2010  *                 data to the user space buffer.
2011  * return value -1 An error occurred while executing the command.
2012  */
2013 static int exec_drive_command(struct mtip_port *port, u8 *command,
2014                                 void __user *user_buffer)
2015 {
2016         struct host_to_dev_fis  fis;
2017         struct host_to_dev_fis *reply;
2018         u8 *buf = NULL;
2019         dma_addr_t dma_addr = 0;
2020         int rv = 0, xfer_sz = command[3];
2021
2022         if (xfer_sz) {
2023                 if (!user_buffer)
2024                         return -EFAULT;
2025
2026                 buf = dmam_alloc_coherent(&port->dd->pdev->dev,
2027                                 ATA_SECT_SIZE * xfer_sz,
2028                                 &dma_addr,
2029                                 GFP_KERNEL);
2030                 if (!buf) {
2031                         dev_err(&port->dd->pdev->dev,
2032                                 "Memory allocation failed (%d bytes)\n",
2033                                 ATA_SECT_SIZE * xfer_sz);
2034                         return -ENOMEM;
2035                 }
2036                 memset(buf, 0, ATA_SECT_SIZE * xfer_sz);
2037         }
2038
2039         /* Build the FIS. */
2040         memset(&fis, 0, sizeof(struct host_to_dev_fis));
2041         fis.type        = 0x27;
2042         fis.opts        = 1 << 7;
2043         fis.command     = command[0];
2044         fis.features    = command[2];
2045         fis.sect_count  = command[3];
2046         if (fis.command == ATA_CMD_SMART) {
2047                 fis.sector      = command[1];
2048                 fis.cyl_low     = 0x4F;
2049                 fis.cyl_hi      = 0xC2;
2050         }
2051
2052         if (xfer_sz)
2053                 reply = (port->rxfis + RX_FIS_PIO_SETUP);
2054         else
2055                 reply = (port->rxfis + RX_FIS_D2H_REG);
2056
2057         dbg_printk(MTIP_DRV_NAME
2058                 " %s: User Command: cmd %x, sect %x, "
2059                 "feat %x, sectcnt %x\n",
2060                 __func__,
2061                 command[0],
2062                 command[1],
2063                 command[2],
2064                 command[3]);
2065
2066         /* Execute the command. */
2067         if (mtip_exec_internal_command(port,
2068                                 &fis,
2069                                  5,
2070                                  (xfer_sz ? dma_addr : 0),
2071                                  (xfer_sz ? ATA_SECT_SIZE * xfer_sz : 0),
2072                                  0,
2073                                  GFP_KERNEL,
2074                                  MTIP_IOCTL_COMMAND_TIMEOUT_MS)
2075                                  < 0) {
2076                 rv = -EFAULT;
2077                 goto exit_drive_command;
2078         }
2079
2080         /* Collect the completion status. */
2081         command[0] = reply->command; /* Status*/
2082         command[1] = reply->features; /* Error*/
2083         command[2] = reply->sect_count;
2084
2085         dbg_printk(MTIP_DRV_NAME
2086                 " %s: Completion Status: stat %x, "
2087                 "err %x, nsect %x\n",
2088                 __func__,
2089                 command[0],
2090                 command[1],
2091                 command[2]);
2092
2093         if (xfer_sz) {
2094                 if (copy_to_user(user_buffer,
2095                                  buf,
2096                                  ATA_SECT_SIZE * command[3])) {
2097                         rv = -EFAULT;
2098                         goto exit_drive_command;
2099                 }
2100         }
2101 exit_drive_command:
2102         if (buf)
2103                 dmam_free_coherent(&port->dd->pdev->dev,
2104                                 ATA_SECT_SIZE * xfer_sz, buf, dma_addr);
2105         return rv;
2106 }
2107
2108 /*
2109  *  Indicates whether a command has a single sector payload.
2110  *
2111  *  @command passed to the device to perform the certain event.
2112  *  @features passed to the device to perform the certain event.
2113  *
2114  *  return value
2115  *      1       command is one that always has a single sector payload,
2116  *              regardless of the value in the Sector Count field.
2117  *      0       otherwise
2118  *
2119  */
2120 static unsigned int implicit_sector(unsigned char command,
2121                                     unsigned char features)
2122 {
2123         unsigned int rv = 0;
2124
2125         /* list of commands that have an implicit sector count of 1 */
2126         switch (command) {
2127         case ATA_CMD_SEC_SET_PASS:
2128         case ATA_CMD_SEC_UNLOCK:
2129         case ATA_CMD_SEC_ERASE_PREP:
2130         case ATA_CMD_SEC_ERASE_UNIT:
2131         case ATA_CMD_SEC_FREEZE_LOCK:
2132         case ATA_CMD_SEC_DISABLE_PASS:
2133         case ATA_CMD_PMP_READ:
2134         case ATA_CMD_PMP_WRITE:
2135                 rv = 1;
2136                 break;
2137         case ATA_CMD_SET_MAX:
2138                 if (features == ATA_SET_MAX_UNLOCK)
2139                         rv = 1;
2140                 break;
2141         case ATA_CMD_SMART:
2142                 if ((features == ATA_SMART_READ_VALUES) ||
2143                                 (features == ATA_SMART_READ_THRESHOLDS))
2144                         rv = 1;
2145                 break;
2146         case ATA_CMD_CONF_OVERLAY:
2147                 if ((features == ATA_DCO_IDENTIFY) ||
2148                                 (features == ATA_DCO_SET))
2149                         rv = 1;
2150                 break;
2151         }
2152         return rv;
2153 }
2154 static void mtip_set_timeout(struct driver_data *dd,
2155                                         struct host_to_dev_fis *fis,
2156                                         unsigned int *timeout, u8 erasemode)
2157 {
2158         switch (fis->command) {
2159         case ATA_CMD_DOWNLOAD_MICRO:
2160                 *timeout = 120000; /* 2 minutes */
2161                 break;
2162         case ATA_CMD_SEC_ERASE_UNIT:
2163         case 0xFC:
2164                 if (erasemode)
2165                         *timeout = ((*(dd->port->identify + 90) * 2) * 60000);
2166                 else
2167                         *timeout = ((*(dd->port->identify + 89) * 2) * 60000);
2168                 break;
2169         case ATA_CMD_STANDBYNOW1:
2170                 *timeout = 120000;  /* 2 minutes */
2171                 break;
2172         case 0xF7:
2173         case 0xFA:
2174                 *timeout = 60000;  /* 60 seconds */
2175                 break;
2176         case ATA_CMD_SMART:
2177                 *timeout = 15000;  /* 15 seconds */
2178                 break;
2179         default:
2180                 *timeout = MTIP_IOCTL_COMMAND_TIMEOUT_MS;
2181                 break;
2182         }
2183 }
2184
2185 /*
2186  * Executes a taskfile
2187  * See ide_taskfile_ioctl() for derivation
2188  */
2189 static int exec_drive_taskfile(struct driver_data *dd,
2190                                void __user *buf,
2191                                ide_task_request_t *req_task,
2192                                int outtotal)
2193 {
2194         struct host_to_dev_fis  fis;
2195         struct host_to_dev_fis *reply;
2196         u8 *outbuf = NULL;
2197         u8 *inbuf = NULL;
2198         dma_addr_t outbuf_dma = 0;
2199         dma_addr_t inbuf_dma = 0;
2200         dma_addr_t dma_buffer = 0;
2201         int err = 0;
2202         unsigned int taskin = 0;
2203         unsigned int taskout = 0;
2204         u8 nsect = 0;
2205         unsigned int timeout;
2206         unsigned int force_single_sector;
2207         unsigned int transfer_size;
2208         unsigned long task_file_data;
2209         int intotal = outtotal + req_task->out_size;
2210         int erasemode = 0;
2211
2212         taskout = req_task->out_size;
2213         taskin = req_task->in_size;
2214         /* 130560 = 512 * 0xFF*/
2215         if (taskin > 130560 || taskout > 130560) {
2216                 err = -EINVAL;
2217                 goto abort;
2218         }
2219
2220         if (taskout) {
2221                 outbuf = kzalloc(taskout, GFP_KERNEL);
2222                 if (outbuf == NULL) {
2223                         err = -ENOMEM;
2224                         goto abort;
2225                 }
2226                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
2227                         err = -EFAULT;
2228                         goto abort;
2229                 }
2230                 outbuf_dma = pci_map_single(dd->pdev,
2231                                          outbuf,
2232                                          taskout,
2233                                          DMA_TO_DEVICE);
2234                 if (outbuf_dma == 0) {
2235                         err = -ENOMEM;
2236                         goto abort;
2237                 }
2238                 dma_buffer = outbuf_dma;
2239         }
2240
2241         if (taskin) {
2242                 inbuf = kzalloc(taskin, GFP_KERNEL);
2243                 if (inbuf == NULL) {
2244                         err = -ENOMEM;
2245                         goto abort;
2246                 }
2247
2248                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
2249                         err = -EFAULT;
2250                         goto abort;
2251                 }
2252                 inbuf_dma = pci_map_single(dd->pdev,
2253                                          inbuf,
2254                                          taskin, DMA_FROM_DEVICE);
2255                 if (inbuf_dma == 0) {
2256                         err = -ENOMEM;
2257                         goto abort;
2258                 }
2259                 dma_buffer = inbuf_dma;
2260         }
2261
2262         /* only supports PIO and non-data commands from this ioctl. */
2263         switch (req_task->data_phase) {
2264         case TASKFILE_OUT:
2265                 nsect = taskout / ATA_SECT_SIZE;
2266                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
2267                 break;
2268         case TASKFILE_IN:
2269                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
2270                 break;
2271         case TASKFILE_NO_DATA:
2272                 reply = (dd->port->rxfis + RX_FIS_D2H_REG);
2273                 break;
2274         default:
2275                 err = -EINVAL;
2276                 goto abort;
2277         }
2278
2279         /* Build the FIS. */
2280         memset(&fis, 0, sizeof(struct host_to_dev_fis));
2281
2282         fis.type        = 0x27;
2283         fis.opts        = 1 << 7;
2284         fis.command     = req_task->io_ports[7];
2285         fis.features    = req_task->io_ports[1];
2286         fis.sect_count  = req_task->io_ports[2];
2287         fis.lba_low     = req_task->io_ports[3];
2288         fis.lba_mid     = req_task->io_ports[4];
2289         fis.lba_hi      = req_task->io_ports[5];
2290          /* Clear the dev bit*/
2291         fis.device      = req_task->io_ports[6] & ~0x10;
2292
2293         if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
2294                 req_task->in_flags.all  =
2295                         IDE_TASKFILE_STD_IN_FLAGS |
2296                         (IDE_HOB_STD_IN_FLAGS << 8);
2297                 fis.lba_low_ex          = req_task->hob_ports[3];
2298                 fis.lba_mid_ex          = req_task->hob_ports[4];
2299                 fis.lba_hi_ex           = req_task->hob_ports[5];
2300                 fis.features_ex         = req_task->hob_ports[1];
2301                 fis.sect_cnt_ex         = req_task->hob_ports[2];
2302
2303         } else {
2304                 req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
2305         }
2306
2307         force_single_sector = implicit_sector(fis.command, fis.features);
2308
2309         if ((taskin || taskout) && (!fis.sect_count)) {
2310                 if (nsect)
2311                         fis.sect_count = nsect;
2312                 else {
2313                         if (!force_single_sector) {
2314                                 dev_warn(&dd->pdev->dev,
2315                                         "data movement but "
2316                                         "sect_count is 0\n");
2317                                         err = -EINVAL;
2318                                         goto abort;
2319                         }
2320                 }
2321         }
2322
2323         dbg_printk(MTIP_DRV_NAME
2324                 " %s: cmd %x, feat %x, nsect %x,"
2325                 " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
2326                 " head/dev %x\n",
2327                 __func__,
2328                 fis.command,
2329                 fis.features,
2330                 fis.sect_count,
2331                 fis.lba_low,
2332                 fis.lba_mid,
2333                 fis.lba_hi,
2334                 fis.device);
2335
2336         /* check for erase mode support during secure erase.*/
2337         if ((fis.command == ATA_CMD_SEC_ERASE_UNIT) && outbuf &&
2338                                         (outbuf[0] & MTIP_SEC_ERASE_MODE)) {
2339                 erasemode = 1;
2340         }
2341
2342         mtip_set_timeout(dd, &fis, &timeout, erasemode);
2343
2344         /* Determine the correct transfer size.*/
2345         if (force_single_sector)
2346                 transfer_size = ATA_SECT_SIZE;
2347         else
2348                 transfer_size = ATA_SECT_SIZE * fis.sect_count;
2349
2350         /* Execute the command.*/
2351         if (mtip_exec_internal_command(dd->port,
2352                                  &fis,
2353                                  5,
2354                                  dma_buffer,
2355                                  transfer_size,
2356                                  0,
2357                                  GFP_KERNEL,
2358                                  timeout) < 0) {
2359                 err = -EIO;
2360                 goto abort;
2361         }
2362
2363         task_file_data = readl(dd->port->mmio+PORT_TFDATA);
2364
2365         if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
2366                 reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
2367                 req_task->io_ports[7] = reply->control;
2368         } else {
2369                 reply = dd->port->rxfis + RX_FIS_D2H_REG;
2370                 req_task->io_ports[7] = reply->command;
2371         }
2372
2373         /* reclaim the DMA buffers.*/
2374         if (inbuf_dma)
2375                 pci_unmap_single(dd->pdev, inbuf_dma,
2376                         taskin, DMA_FROM_DEVICE);
2377         if (outbuf_dma)
2378                 pci_unmap_single(dd->pdev, outbuf_dma,
2379                         taskout, DMA_TO_DEVICE);
2380         inbuf_dma  = 0;
2381         outbuf_dma = 0;
2382
2383         /* return the ATA registers to the caller.*/
2384         req_task->io_ports[1] = reply->features;
2385         req_task->io_ports[2] = reply->sect_count;
2386         req_task->io_ports[3] = reply->lba_low;
2387         req_task->io_ports[4] = reply->lba_mid;
2388         req_task->io_ports[5] = reply->lba_hi;
2389         req_task->io_ports[6] = reply->device;
2390
2391         if (req_task->out_flags.all & 1)  {
2392
2393                 req_task->hob_ports[3] = reply->lba_low_ex;
2394                 req_task->hob_ports[4] = reply->lba_mid_ex;
2395                 req_task->hob_ports[5] = reply->lba_hi_ex;
2396                 req_task->hob_ports[1] = reply->features_ex;
2397                 req_task->hob_ports[2] = reply->sect_cnt_ex;
2398         }
2399         dbg_printk(MTIP_DRV_NAME
2400                 " %s: Completion: stat %x,"
2401                 "err %x, sect_cnt %x, lbalo %x,"
2402                 "lbamid %x, lbahi %x, dev %x\n",
2403                 __func__,
2404                 req_task->io_ports[7],
2405                 req_task->io_ports[1],
2406                 req_task->io_ports[2],
2407                 req_task->io_ports[3],
2408                 req_task->io_ports[4],
2409                 req_task->io_ports[5],
2410                 req_task->io_ports[6]);
2411
2412         if (taskout) {
2413                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
2414                         err = -EFAULT;
2415                         goto abort;
2416                 }
2417         }
2418         if (taskin) {
2419                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
2420                         err = -EFAULT;
2421                         goto abort;
2422                 }
2423         }
2424 abort:
2425         if (inbuf_dma)
2426                 pci_unmap_single(dd->pdev, inbuf_dma,
2427                                         taskin, DMA_FROM_DEVICE);
2428         if (outbuf_dma)
2429                 pci_unmap_single(dd->pdev, outbuf_dma,
2430                                         taskout, DMA_TO_DEVICE);
2431         kfree(outbuf);
2432         kfree(inbuf);
2433
2434         return err;
2435 }
2436
2437 /*
2438  * Handle IOCTL calls from the Block Layer.
2439  *
2440  * This function is called by the Block Layer when it receives an IOCTL
2441  * command that it does not understand. If the IOCTL command is not supported
2442  * this function returns -ENOTTY.
2443  *
2444  * @dd  Pointer to the driver data structure.
2445  * @cmd IOCTL command passed from the Block Layer.
2446  * @arg IOCTL argument passed from the Block Layer.
2447  *
2448  * return value
2449  *      0       The IOCTL completed successfully.
2450  *      -ENOTTY The specified command is not supported.
2451  *      -EFAULT An error occurred copying data to a user space buffer.
2452  *      -EIO    An error occurred while executing the command.
2453  */
2454 static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
2455                          unsigned long arg)
2456 {
2457         switch (cmd) {
2458         case HDIO_GET_IDENTITY:
2459         {
2460                 if (copy_to_user((void __user *)arg, dd->port->identify,
2461                                                 sizeof(u16) * ATA_ID_WORDS))
2462                         return -EFAULT;
2463                 break;
2464         }
2465         case HDIO_DRIVE_CMD:
2466         {
2467                 u8 drive_command[4];
2468
2469                 /* Copy the user command info to our buffer. */
2470                 if (copy_from_user(drive_command,
2471                                          (void __user *) arg,
2472                                          sizeof(drive_command)))
2473                         return -EFAULT;
2474
2475                 /* Execute the drive command. */
2476                 if (exec_drive_command(dd->port,
2477                                          drive_command,
2478                                          (void __user *) (arg+4)))
2479                         return -EIO;
2480
2481                 /* Copy the status back to the users buffer. */
2482                 if (copy_to_user((void __user *) arg,
2483                                          drive_command,
2484                                          sizeof(drive_command)))
2485                         return -EFAULT;
2486
2487                 break;
2488         }
2489         case HDIO_DRIVE_TASK:
2490         {
2491                 u8 drive_command[7];
2492
2493                 /* Copy the user command info to our buffer. */
2494                 if (copy_from_user(drive_command,
2495                                          (void __user *) arg,
2496                                          sizeof(drive_command)))
2497                         return -EFAULT;
2498
2499                 /* Execute the drive command. */
2500                 if (exec_drive_task(dd->port, drive_command))
2501                         return -EIO;
2502
2503                 /* Copy the status back to the users buffer. */
2504                 if (copy_to_user((void __user *) arg,
2505                                          drive_command,
2506                                          sizeof(drive_command)))
2507                         return -EFAULT;
2508
2509                 break;
2510         }
2511         case HDIO_DRIVE_TASKFILE: {
2512                 ide_task_request_t req_task;
2513                 int ret, outtotal;
2514
2515                 if (copy_from_user(&req_task, (void __user *) arg,
2516                                         sizeof(req_task)))
2517                         return -EFAULT;
2518
2519                 outtotal = sizeof(req_task);
2520
2521                 ret = exec_drive_taskfile(dd, (void __user *) arg,
2522                                                 &req_task, outtotal);
2523
2524                 if (copy_to_user((void __user *) arg, &req_task,
2525                                                         sizeof(req_task)))
2526                         return -EFAULT;
2527
2528                 return ret;
2529         }
2530
2531         default:
2532                 return -EINVAL;
2533         }
2534         return 0;
2535 }
2536
2537 /*
2538  * Submit an IO to the hw
2539  *
2540  * This function is called by the block layer to issue an io
2541  * to the device. Upon completion, the callback function will
2542  * be called with the data parameter passed as the callback data.
2543  *
2544  * @dd       Pointer to the driver data structure.
2545  * @start    First sector to read.
2546  * @nsect    Number of sectors to read.
2547  * @nents    Number of entries in scatter list for the read command.
2548  * @tag      The tag of this read command.
2549  * @callback Pointer to the function that should be called
2550  *           when the read completes.
2551  * @data     Callback data passed to the callback function
2552  *           when the read completes.
2553  * @dir      Direction (read or write)
2554  *
2555  * return value
2556  *      None
2557  */
2558 static void mtip_hw_submit_io(struct driver_data *dd, sector_t sector,
2559                               int nsect, int nents, int tag, void *callback,
2560                               void *data, int dir)
2561 {
2562         struct host_to_dev_fis  *fis;
2563         struct mtip_port *port = dd->port;
2564         struct mtip_cmd *command = &port->commands[tag];
2565         int dma_dir = (dir == READ) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2566         u64 start = sector;
2567
2568         /* Map the scatter list for DMA access */
2569         nents = dma_map_sg(&dd->pdev->dev, command->sg, nents, dma_dir);
2570
2571         command->scatter_ents = nents;
2572
2573         /*
2574          * The number of retries for this command before it is
2575          * reported as a failure to the upper layers.
2576          */
2577         command->retries = MTIP_MAX_RETRIES;
2578
2579         /* Fill out fis */
2580         fis = command->command;
2581         fis->type        = 0x27;
2582         fis->opts        = 1 << 7;
2583         fis->command     =
2584                 (dir == READ ? ATA_CMD_FPDMA_READ : ATA_CMD_FPDMA_WRITE);
2585         fis->lba_low     = start & 0xFF;
2586         fis->lba_mid     = (start >> 8) & 0xFF;
2587         fis->lba_hi      = (start >> 16) & 0xFF;
2588         fis->lba_low_ex  = (start >> 24) & 0xFF;
2589         fis->lba_mid_ex  = (start >> 32) & 0xFF;
2590         fis->lba_hi_ex   = (start >> 40) & 0xFF;
2591         fis->device      = 1 << 6;
2592         fis->features    = nsect & 0xFF;
2593         fis->features_ex = (nsect >> 8) & 0xFF;
2594         fis->sect_count  = ((tag << 3) | (tag >> 5));
2595         fis->sect_cnt_ex = 0;
2596         fis->control     = 0;
2597         fis->res2        = 0;
2598         fis->res3        = 0;
2599         fill_command_sg(dd, command, nents);
2600
2601         /* Populate the command header */
2602         command->command_header->opts =
2603                         __force_bit2int cpu_to_le32(
2604                                 (nents << 16) | 5 | AHCI_CMD_PREFETCH);
2605         command->command_header->byte_count = 0;
2606
2607         /*
2608          * Set the completion function and data for the command
2609          * within this layer.
2610          */
2611         command->comp_data = dd;
2612         command->comp_func = mtip_async_complete;
2613         command->direction = dma_dir;
2614
2615         /*
2616          * Set the completion function and data for the command passed
2617          * from the upper layer.
2618          */
2619         command->async_data = data;
2620         command->async_callback = callback;
2621
2622         /*
2623          * To prevent this command from being issued
2624          * if an internal command is in progress or error handling is active.
2625          */
2626         if (port->flags & MTIP_PF_PAUSE_IO) {
2627                 set_bit(tag, port->cmds_to_issue);
2628                 set_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2629                 return;
2630         }
2631
2632         /* Issue the command to the hardware */
2633         mtip_issue_ncq_command(port, tag);
2634
2635         return;
2636 }
2637
2638 /*
2639  * Release a command slot.
2640  *
2641  * @dd  Pointer to the driver data structure.
2642  * @tag Slot tag
2643  *
2644  * return value
2645  *      None
2646  */
2647 static void mtip_hw_release_scatterlist(struct driver_data *dd, int tag)
2648 {
2649         release_slot(dd->port, tag);
2650 }
2651
2652 /*
2653  * Obtain a command slot and return its associated scatter list.
2654  *
2655  * @dd  Pointer to the driver data structure.
2656  * @tag Pointer to an int that will receive the allocated command
2657  *            slot tag.
2658  *
2659  * return value
2660  *      Pointer to the scatter list for the allocated command slot
2661  *      or NULL if no command slots are available.
2662  */
2663 static struct scatterlist *mtip_hw_get_scatterlist(struct driver_data *dd,
2664                                                    int *tag)
2665 {
2666         /*
2667          * It is possible that, even with this semaphore, a thread
2668          * may think that no command slots are available. Therefore, we
2669          * need to make an attempt to get_slot().
2670          */
2671         down(&dd->port->cmd_slot);
2672         *tag = get_slot(dd->port);
2673
2674         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
2675                 up(&dd->port->cmd_slot);
2676                 return NULL;
2677         }
2678         if (unlikely(*tag < 0)) {
2679                 up(&dd->port->cmd_slot);
2680                 return NULL;
2681         }
2682
2683         return dd->port->commands[*tag].sg;
2684 }
2685
2686 /*
2687  * Sysfs status dump.
2688  *
2689  * @dev  Pointer to the device structure, passed by the kernrel.
2690  * @attr Pointer to the device_attribute structure passed by the kernel.
2691  * @buf  Pointer to the char buffer that will receive the stats info.
2692  *
2693  * return value
2694  *      The size, in bytes, of the data copied into buf.
2695  */
2696 static ssize_t mtip_hw_show_status(struct device *dev,
2697                                 struct device_attribute *attr,
2698                                 char *buf)
2699 {
2700         struct driver_data *dd = dev_to_disk(dev)->private_data;
2701         int size = 0;
2702
2703         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
2704                 size += sprintf(buf, "%s", "thermal_shutdown\n");
2705         else if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag))
2706                 size += sprintf(buf, "%s", "write_protect\n");
2707         else
2708                 size += sprintf(buf, "%s", "online\n");
2709
2710         return size;
2711 }
2712
2713 static DEVICE_ATTR(status, S_IRUGO, mtip_hw_show_status, NULL);
2714
2715 /* debugsfs entries */
2716
2717 static ssize_t show_device_status(struct device_driver *drv, char *buf)
2718 {
2719         int size = 0;
2720         struct driver_data *dd, *tmp;
2721         unsigned long flags;
2722         char id_buf[42];
2723         u16 status = 0;
2724
2725         spin_lock_irqsave(&dev_lock, flags);
2726         size += sprintf(&buf[size], "Devices Present:\n");
2727         list_for_each_entry_safe(dd, tmp, &online_list, online_list) {
2728                 if (dd->pdev) {
2729                         if (dd->port &&
2730                             dd->port->identify &&
2731                             dd->port->identify_valid) {
2732                                 strlcpy(id_buf,
2733                                         (char *) (dd->port->identify + 10), 21);
2734                                 status = *(dd->port->identify + 141);
2735                         } else {
2736                                 memset(id_buf, 0, 42);
2737                                 status = 0;
2738                         }
2739
2740                         if (dd->port &&
2741                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2742                                 size += sprintf(&buf[size],
2743                                         " device %s %s (ftl rebuild %d %%)\n",
2744                                         dev_name(&dd->pdev->dev),
2745                                         id_buf,
2746                                         status);
2747                         } else {
2748                                 size += sprintf(&buf[size],
2749                                         " device %s %s\n",
2750                                         dev_name(&dd->pdev->dev),
2751                                         id_buf);
2752                         }
2753                 }
2754         }
2755
2756         size += sprintf(&buf[size], "Devices Being Removed:\n");
2757         list_for_each_entry_safe(dd, tmp, &removing_list, remove_list) {
2758                 if (dd->pdev) {
2759                         if (dd->port &&
2760                             dd->port->identify &&
2761                             dd->port->identify_valid) {
2762                                 strlcpy(id_buf,
2763                                         (char *) (dd->port->identify+10), 21);
2764                                 status = *(dd->port->identify + 141);
2765                         } else {
2766                                 memset(id_buf, 0, 42);
2767                                 status = 0;
2768                         }
2769
2770                         if (dd->port &&
2771                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2772                                 size += sprintf(&buf[size],
2773                                         " device %s %s (ftl rebuild %d %%)\n",
2774                                         dev_name(&dd->pdev->dev),
2775                                         id_buf,
2776                                         status);
2777                         } else {
2778                                 size += sprintf(&buf[size],
2779                                         " device %s %s\n",
2780                                         dev_name(&dd->pdev->dev),
2781                                         id_buf);
2782                         }
2783                 }
2784         }
2785         spin_unlock_irqrestore(&dev_lock, flags);
2786
2787         return size;
2788 }
2789
2790 static ssize_t mtip_hw_read_device_status(struct file *f, char __user *ubuf,
2791                                                 size_t len, loff_t *offset)
2792 {
2793         int size = *offset;
2794         char buf[MTIP_DFS_MAX_BUF_SIZE];
2795
2796         if (!len || *offset)
2797                 return 0;
2798
2799         size += show_device_status(NULL, buf);
2800
2801         *offset = size <= len ? size : len;
2802         size = copy_to_user(ubuf, buf, *offset);
2803         if (size)
2804                 return -EFAULT;
2805
2806         return *offset;
2807 }
2808
2809 static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
2810                                   size_t len, loff_t *offset)
2811 {
2812         struct driver_data *dd =  (struct driver_data *)f->private_data;
2813         char buf[MTIP_DFS_MAX_BUF_SIZE];
2814         u32 group_allocated;
2815         int size = *offset;
2816         int n;
2817
2818         if (!len || size)
2819                 return 0;
2820
2821         size += sprintf(&buf[size], "H/ S ACTive      : [ 0x");
2822
2823         for (n = dd->slot_groups-1; n >= 0; n--)
2824                 size += sprintf(&buf[size], "%08X ",
2825                                          readl(dd->port->s_active[n]));
2826
2827         size += sprintf(&buf[size], "]\n");
2828         size += sprintf(&buf[size], "H/ Command Issue : [ 0x");
2829
2830         for (n = dd->slot_groups-1; n >= 0; n--)
2831                 size += sprintf(&buf[size], "%08X ",
2832                                         readl(dd->port->cmd_issue[n]));
2833
2834         size += sprintf(&buf[size], "]\n");
2835         size += sprintf(&buf[size], "H/ Completed     : [ 0x");
2836
2837         for (n = dd->slot_groups-1; n >= 0; n--)
2838                 size += sprintf(&buf[size], "%08X ",
2839                                 readl(dd->port->completed[n]));
2840
2841         size += sprintf(&buf[size], "]\n");
2842         size += sprintf(&buf[size], "H/ PORT IRQ STAT : [ 0x%08X ]\n",
2843                                 readl(dd->port->mmio + PORT_IRQ_STAT));
2844         size += sprintf(&buf[size], "H/ HOST IRQ STAT : [ 0x%08X ]\n",
2845                                 readl(dd->mmio + HOST_IRQ_STAT));
2846         size += sprintf(&buf[size], "\n");
2847
2848         size += sprintf(&buf[size], "L/ Allocated     : [ 0x");
2849
2850         for (n = dd->slot_groups-1; n >= 0; n--) {
2851                 if (sizeof(long) > sizeof(u32))
2852                         group_allocated =
2853                                 dd->port->allocated[n/2] >> (32*(n&1));
2854                 else
2855                         group_allocated = dd->port->allocated[n];
2856                 size += sprintf(&buf[size], "%08X ", group_allocated);
2857         }
2858         size += sprintf(&buf[size], "]\n");
2859
2860         size += sprintf(&buf[size], "L/ Commands in Q : [ 0x");
2861
2862         for (n = dd->slot_groups-1; n >= 0; n--) {
2863                 if (sizeof(long) > sizeof(u32))
2864                         group_allocated =
2865                                 dd->port->cmds_to_issue[n/2] >> (32*(n&1));
2866                 else
2867                         group_allocated = dd->port->cmds_to_issue[n];
2868                 size += sprintf(&buf[size], "%08X ", group_allocated);
2869         }
2870         size += sprintf(&buf[size], "]\n");
2871
2872         *offset = size <= len ? size : len;
2873         size = copy_to_user(ubuf, buf, *offset);
2874         if (size)
2875                 return -EFAULT;
2876
2877         return *offset;
2878 }
2879
2880 static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
2881                                   size_t len, loff_t *offset)
2882 {
2883         struct driver_data *dd =  (struct driver_data *)f->private_data;
2884         char buf[MTIP_DFS_MAX_BUF_SIZE];
2885         int size = *offset;
2886
2887         if (!len || size)
2888                 return 0;
2889
2890         size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
2891                                                         dd->port->flags);
2892         size += sprintf(&buf[size], "Flag-dd   : [ %08lX ]\n",
2893                                                         dd->dd_flag);
2894
2895         *offset = size <= len ? size : len;
2896         size = copy_to_user(ubuf, buf, *offset);
2897         if (size)
2898                 return -EFAULT;
2899
2900         return *offset;
2901 }
2902
2903 static const struct file_operations mtip_device_status_fops = {
2904         .owner  = THIS_MODULE,
2905         .open   = simple_open,
2906         .read   = mtip_hw_read_device_status,
2907         .llseek = no_llseek,
2908 };
2909
2910 static const struct file_operations mtip_regs_fops = {
2911         .owner  = THIS_MODULE,
2912         .open   = simple_open,
2913         .read   = mtip_hw_read_registers,
2914         .llseek = no_llseek,
2915 };
2916
2917 static const struct file_operations mtip_flags_fops = {
2918         .owner  = THIS_MODULE,
2919         .open   = simple_open,
2920         .read   = mtip_hw_read_flags,
2921         .llseek = no_llseek,
2922 };
2923
2924 /*
2925  * Create the sysfs related attributes.
2926  *
2927  * @dd   Pointer to the driver data structure.
2928  * @kobj Pointer to the kobj for the block device.
2929  *
2930  * return value
2931  *      0       Operation completed successfully.
2932  *      -EINVAL Invalid parameter.
2933  */
2934 static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
2935 {
2936         if (!kobj || !dd)
2937                 return -EINVAL;
2938
2939         if (sysfs_create_file(kobj, &dev_attr_status.attr))
2940                 dev_warn(&dd->pdev->dev,
2941                         "Error creating 'status' sysfs entry\n");
2942         return 0;
2943 }
2944
2945 /*
2946  * Remove the sysfs related attributes.
2947  *
2948  * @dd   Pointer to the driver data structure.
2949  * @kobj Pointer to the kobj for the block device.
2950  *
2951  * return value
2952  *      0       Operation completed successfully.
2953  *      -EINVAL Invalid parameter.
2954  */
2955 static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
2956 {
2957         if (!kobj || !dd)
2958                 return -EINVAL;
2959
2960         sysfs_remove_file(kobj, &dev_attr_status.attr);
2961
2962         return 0;
2963 }
2964
2965 static int mtip_hw_debugfs_init(struct driver_data *dd)
2966 {
2967         if (!dfs_parent)
2968                 return -1;
2969
2970         dd->dfs_node = debugfs_create_dir(dd->disk->disk_name, dfs_parent);
2971         if (IS_ERR_OR_NULL(dd->dfs_node)) {
2972                 dev_warn(&dd->pdev->dev,
2973                         "Error creating node %s under debugfs\n",
2974                                                 dd->disk->disk_name);
2975                 dd->dfs_node = NULL;
2976                 return -1;
2977         }
2978
2979         debugfs_create_file("flags", S_IRUGO, dd->dfs_node, dd,
2980                                                         &mtip_flags_fops);
2981         debugfs_create_file("registers", S_IRUGO, dd->dfs_node, dd,
2982                                                         &mtip_regs_fops);
2983
2984         return 0;
2985 }
2986
2987 static void mtip_hw_debugfs_exit(struct driver_data *dd)
2988 {
2989         debugfs_remove_recursive(dd->dfs_node);
2990 }
2991
2992
2993 /*
2994  * Perform any init/resume time hardware setup
2995  *
2996  * @dd Pointer to the driver data structure.
2997  *
2998  * return value
2999  *      None
3000  */
3001 static inline void hba_setup(struct driver_data *dd)
3002 {
3003         u32 hwdata;
3004         hwdata = readl(dd->mmio + HOST_HSORG);
3005
3006         /* interrupt bug workaround: use only 1 IS bit.*/
3007         writel(hwdata |
3008                 HSORG_DISABLE_SLOTGRP_INTR |
3009                 HSORG_DISABLE_SLOTGRP_PXIS,
3010                 dd->mmio + HOST_HSORG);
3011 }
3012
3013 /*
3014  * Detect the details of the product, and store anything needed
3015  * into the driver data structure.  This includes product type and
3016  * version and number of slot groups.
3017  *
3018  * @dd Pointer to the driver data structure.
3019  *
3020  * return value
3021  *      None
3022  */
3023 static void mtip_detect_product(struct driver_data *dd)
3024 {
3025         u32 hwdata;
3026         unsigned int rev, slotgroups;
3027
3028         /*
3029          * HBA base + 0xFC [15:0] - vendor-specific hardware interface
3030          * info register:
3031          * [15:8] hardware/software interface rev#
3032          * [   3] asic-style interface
3033          * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
3034          */
3035         hwdata = readl(dd->mmio + HOST_HSORG);
3036
3037         dd->product_type = MTIP_PRODUCT_UNKNOWN;
3038         dd->slot_groups = 1;
3039
3040         if (hwdata & 0x8) {
3041                 dd->product_type = MTIP_PRODUCT_ASICFPGA;
3042                 rev = (hwdata & HSORG_HWREV) >> 8;
3043                 slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
3044                 dev_info(&dd->pdev->dev,
3045                         "ASIC-FPGA design, HS rev 0x%x, "
3046                         "%i slot groups [%i slots]\n",
3047                          rev,
3048                          slotgroups,
3049                          slotgroups * 32);
3050
3051                 if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
3052                         dev_warn(&dd->pdev->dev,
3053                                 "Warning: driver only supports "
3054                                 "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
3055                         slotgroups = MTIP_MAX_SLOT_GROUPS;
3056                 }
3057                 dd->slot_groups = slotgroups;
3058                 return;
3059         }
3060
3061         dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
3062 }
3063
3064 /*
3065  * Blocking wait for FTL rebuild to complete
3066  *
3067  * @dd Pointer to the DRIVER_DATA structure.
3068  *
3069  * return value
3070  *      0       FTL rebuild completed successfully
3071  *      -EFAULT FTL rebuild error/timeout/interruption
3072  */
3073 static int mtip_ftl_rebuild_poll(struct driver_data *dd)
3074 {
3075         unsigned long timeout, cnt = 0, start;
3076
3077         dev_warn(&dd->pdev->dev,
3078                 "FTL rebuild in progress. Polling for completion.\n");
3079
3080         start = jiffies;
3081         timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
3082
3083         do {
3084                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
3085                                 &dd->dd_flag)))
3086                         return -EFAULT;
3087                 if (mtip_check_surprise_removal(dd->pdev))
3088                         return -EFAULT;
3089
3090                 if (mtip_get_identify(dd->port, NULL) < 0)
3091                         return -EFAULT;
3092
3093                 if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
3094                         MTIP_FTL_REBUILD_MAGIC) {
3095                         ssleep(1);
3096                         /* Print message every 3 minutes */
3097                         if (cnt++ >= 180) {
3098                                 dev_warn(&dd->pdev->dev,
3099                                 "FTL rebuild in progress (%d secs).\n",
3100                                 jiffies_to_msecs(jiffies - start) / 1000);
3101                                 cnt = 0;
3102                         }
3103                 } else {
3104                         dev_warn(&dd->pdev->dev,
3105                                 "FTL rebuild complete (%d secs).\n",
3106                         jiffies_to_msecs(jiffies - start) / 1000);
3107                         mtip_block_initialize(dd);
3108                         return 0;
3109                 }
3110                 ssleep(10);
3111         } while (time_before(jiffies, timeout));
3112
3113         /* Check for timeout */
3114         dev_err(&dd->pdev->dev,
3115                 "Timed out waiting for FTL rebuild to complete (%d secs).\n",
3116                 jiffies_to_msecs(jiffies - start) / 1000);
3117         return -EFAULT;
3118 }
3119
3120 /*
3121  * service thread to issue queued commands
3122  *
3123  * @data Pointer to the driver data structure.
3124  *
3125  * return value
3126  *      0
3127  */
3128
3129 static int mtip_service_thread(void *data)
3130 {
3131         struct driver_data *dd = (struct driver_data *)data;
3132         unsigned long slot, slot_start, slot_wrap;
3133         unsigned int num_cmd_slots = dd->slot_groups * 32;
3134         struct mtip_port *port = dd->port;
3135
3136         while (1) {
3137                 /*
3138                  * the condition is to check neither an internal command is
3139                  * is in progress nor error handling is active
3140                  */
3141                 wait_event_interruptible(port->svc_wait, (port->flags) &&
3142                         !(port->flags & MTIP_PF_PAUSE_IO));
3143
3144                 if (kthread_should_stop())
3145                         break;
3146
3147                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
3148                                 &dd->dd_flag)))
3149                         break;
3150
3151                 set_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
3152                 if (test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
3153                         slot = 1;
3154                         /* used to restrict the loop to one iteration */
3155                         slot_start = num_cmd_slots;
3156                         slot_wrap = 0;
3157                         while (1) {
3158                                 slot = find_next_bit(port->cmds_to_issue,
3159                                                 num_cmd_slots, slot);
3160                                 if (slot_wrap == 1) {
3161                                         if ((slot_start >= slot) ||
3162                                                 (slot >= num_cmd_slots))
3163                                                 break;
3164                                 }
3165                                 if (unlikely(slot_start == num_cmd_slots))
3166                                         slot_start = slot;
3167
3168                                 if (unlikely(slot == num_cmd_slots)) {
3169                                         slot = 1;
3170                                         slot_wrap = 1;
3171                                         continue;
3172                                 }
3173
3174                                 /* Issue the command to the hardware */
3175                                 mtip_issue_ncq_command(port, slot);
3176
3177                                 clear_bit(slot, port->cmds_to_issue);
3178                         }
3179
3180                         clear_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
3181                 } else if (test_bit(MTIP_PF_REBUILD_BIT, &port->flags)) {
3182                         if (!mtip_ftl_rebuild_poll(dd))
3183                                 set_bit(MTIP_DDF_REBUILD_FAILED_BIT,
3184                                                         &dd->dd_flag);
3185                         clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
3186                 }
3187                 clear_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
3188
3189                 if (test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
3190                         break;
3191         }
3192         return 0;
3193 }
3194
3195 /*
3196  * Called once for each card.
3197  *
3198  * @dd Pointer to the driver data structure.
3199  *
3200  * return value
3201  *      0 on success, else an error code.
3202  */
3203 static int mtip_hw_init(struct driver_data *dd)
3204 {
3205         int i;
3206         int rv;
3207         unsigned int num_command_slots;
3208         unsigned long timeout, timetaken;
3209         unsigned char *buf;
3210         struct smart_attr attr242;
3211
3212         dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
3213
3214         mtip_detect_product(dd);
3215         if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
3216                 rv = -EIO;
3217                 goto out1;
3218         }
3219         num_command_slots = dd->slot_groups * 32;
3220
3221         hba_setup(dd);
3222
3223         dd->port = kzalloc_node(sizeof(struct mtip_port), GFP_KERNEL,
3224                                 dd->numa_node);
3225         if (!dd->port) {
3226                 dev_err(&dd->pdev->dev,
3227                         "Memory allocation: port structure\n");
3228                 return -ENOMEM;
3229         }
3230
3231         /* Continue workqueue setup */
3232         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
3233                 dd->work[i].port = dd->port;
3234
3235         /* Counting semaphore to track command slot usage */
3236         sema_init(&dd->port->cmd_slot, num_command_slots - 1);
3237
3238         /* Spinlock to prevent concurrent issue */
3239         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
3240                 spin_lock_init(&dd->port->cmd_issue_lock[i]);
3241
3242         /* Set the port mmio base address. */
3243         dd->port->mmio  = dd->mmio + PORT_OFFSET;
3244         dd->port->dd    = dd;
3245
3246         /* Allocate memory for the command list. */
3247         dd->port->command_list =
3248                 dmam_alloc_coherent(&dd->pdev->dev,
3249                         HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3250                         &dd->port->command_list_dma,
3251                         GFP_KERNEL);
3252         if (!dd->port->command_list) {
3253                 dev_err(&dd->pdev->dev,
3254                         "Memory allocation: command list\n");
3255                 rv = -ENOMEM;
3256                 goto out1;
3257         }
3258
3259         /* Clear the memory we have allocated. */
3260         memset(dd->port->command_list,
3261                 0,
3262                 HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4));
3263
3264         /* Setup the addresse of the RX FIS. */
3265         dd->port->rxfis     = dd->port->command_list + HW_CMD_SLOT_SZ;
3266         dd->port->rxfis_dma = dd->port->command_list_dma + HW_CMD_SLOT_SZ;
3267
3268         /* Setup the address of the command tables. */
3269         dd->port->command_table   = dd->port->rxfis + AHCI_RX_FIS_SZ;
3270         dd->port->command_tbl_dma = dd->port->rxfis_dma + AHCI_RX_FIS_SZ;
3271
3272         /* Setup the address of the identify data. */
3273         dd->port->identify     = dd->port->command_table +
3274                                         HW_CMD_TBL_AR_SZ;
3275         dd->port->identify_dma = dd->port->command_tbl_dma +
3276                                         HW_CMD_TBL_AR_SZ;
3277
3278         /* Setup the address of the sector buffer - for some non-ncq cmds */
3279         dd->port->sector_buffer = (void *) dd->port->identify + ATA_SECT_SIZE;
3280         dd->port->sector_buffer_dma = dd->port->identify_dma + ATA_SECT_SIZE;
3281
3282         /* Setup the address of the log buf - for read log command */
3283         dd->port->log_buf = (void *)dd->port->sector_buffer  + ATA_SECT_SIZE;
3284         dd->port->log_buf_dma = dd->port->sector_buffer_dma + ATA_SECT_SIZE;
3285
3286         /* Setup the address of the smart buf - for smart read data command */
3287         dd->port->smart_buf = (void *)dd->port->log_buf  + ATA_SECT_SIZE;
3288         dd->port->smart_buf_dma = dd->port->log_buf_dma + ATA_SECT_SIZE;
3289
3290
3291         /* Point the command headers at the command tables. */
3292         for (i = 0; i < num_command_slots; i++) {
3293                 dd->port->commands[i].command_header =
3294                                         dd->port->command_list +
3295                                         (sizeof(struct mtip_cmd_hdr) * i);
3296                 dd->port->commands[i].command_header_dma =
3297                                         dd->port->command_list_dma +
3298                                         (sizeof(struct mtip_cmd_hdr) * i);
3299
3300                 dd->port->commands[i].command =
3301                         dd->port->command_table + (HW_CMD_TBL_SZ * i);
3302                 dd->port->commands[i].command_dma =
3303                         dd->port->command_tbl_dma + (HW_CMD_TBL_SZ * i);
3304
3305                 if (readl(dd->mmio + HOST_CAP) & HOST_CAP_64)
3306                         dd->port->commands[i].command_header->ctbau =
3307                         __force_bit2int cpu_to_le32(
3308                         (dd->port->commands[i].command_dma >> 16) >> 16);
3309                 dd->port->commands[i].command_header->ctba =
3310                         __force_bit2int cpu_to_le32(
3311                         dd->port->commands[i].command_dma & 0xFFFFFFFF);
3312
3313                 /*
3314                  * If this is not done, a bug is reported by the stock
3315                  * FC11 i386. Due to the fact that it has lots of kernel
3316                  * debugging enabled.
3317                  */
3318                 sg_init_table(dd->port->commands[i].sg, MTIP_MAX_SG);
3319
3320                 /* Mark all commands as currently inactive.*/
3321                 atomic_set(&dd->port->commands[i].active, 0);
3322         }
3323
3324         /* Setup the pointers to the extended s_active and CI registers. */
3325         for (i = 0; i < dd->slot_groups; i++) {
3326                 dd->port->s_active[i] =
3327                         dd->port->mmio + i*0x80 + PORT_SCR_ACT;
3328                 dd->port->cmd_issue[i] =
3329                         dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
3330                 dd->port->completed[i] =
3331                         dd->port->mmio + i*0x80 + PORT_SDBV;
3332         }
3333
3334         timetaken = jiffies;
3335         timeout = jiffies + msecs_to_jiffies(30000);
3336         while (((readl(dd->port->mmio + PORT_SCR_STAT) & 0x0F) != 0x03) &&
3337                  time_before(jiffies, timeout)) {
3338                 mdelay(100);
3339         }
3340         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
3341                 timetaken = jiffies - timetaken;
3342                 dev_warn(&dd->pdev->dev,
3343                         "Surprise removal detected at %u ms\n",
3344                         jiffies_to_msecs(timetaken));
3345                 rv = -ENODEV;
3346                 goto out2 ;
3347         }
3348         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
3349                 timetaken = jiffies - timetaken;
3350                 dev_warn(&dd->pdev->dev,
3351                         "Removal detected at %u ms\n",
3352                         jiffies_to_msecs(timetaken));
3353                 rv = -EFAULT;
3354                 goto out2;
3355         }
3356
3357         /* Conditionally reset the HBA. */
3358         if (!(readl(dd->mmio + HOST_CAP) & HOST_CAP_NZDMA)) {
3359                 if (mtip_hba_reset(dd) < 0) {
3360                         dev_err(&dd->pdev->dev,
3361                                 "Card did not reset within timeout\n");
3362                         rv = -EIO;
3363                         goto out2;
3364                 }
3365         } else {
3366                 /* Clear any pending interrupts on the HBA */
3367                 writel(readl(dd->mmio + HOST_IRQ_STAT),
3368                         dd->mmio + HOST_IRQ_STAT);
3369         }
3370
3371         mtip_init_port(dd->port);
3372         mtip_start_port(dd->port);
3373
3374         /* Setup the ISR and enable interrupts. */
3375         rv = devm_request_irq(&dd->pdev->dev,
3376                                 dd->pdev->irq,
3377                                 mtip_irq_handler,
3378                                 IRQF_SHARED,
3379                                 dev_driver_string(&dd->pdev->dev),
3380                                 dd);
3381
3382         if (rv) {
3383                 dev_err(&dd->pdev->dev,
3384                         "Unable to allocate IRQ %d\n", dd->pdev->irq);
3385                 goto out2;
3386         }
3387         irq_set_affinity_hint(dd->pdev->irq, get_cpu_mask(dd->isr_binding));
3388
3389         /* Enable interrupts on the HBA. */
3390         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3391                                         dd->mmio + HOST_CTL);
3392
3393         init_timer(&dd->port->cmd_timer);
3394         init_waitqueue_head(&dd->port->svc_wait);
3395
3396         dd->port->cmd_timer.data = (unsigned long int) dd->port;
3397         dd->port->cmd_timer.function = mtip_timeout_function;
3398         mod_timer(&dd->port->cmd_timer,
3399                 jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
3400
3401
3402         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
3403                 rv = -EFAULT;
3404                 goto out3;
3405         }
3406
3407         if (mtip_get_identify(dd->port, NULL) < 0) {
3408                 rv = -EFAULT;
3409                 goto out3;
3410         }
3411
3412         if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
3413                 MTIP_FTL_REBUILD_MAGIC) {
3414                 set_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags);
3415                 return MTIP_FTL_REBUILD_MAGIC;
3416         }
3417         mtip_dump_identify(dd->port);
3418
3419         /* check write protect, over temp and rebuild statuses */
3420         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
3421                                 dd->port->log_buf,
3422                                 dd->port->log_buf_dma, 1);
3423         if (rv) {
3424                 dev_warn(&dd->pdev->dev,
3425                         "Error in READ LOG EXT (10h) command\n");
3426                 /* non-critical error, don't fail the load */
3427         } else {
3428                 buf = (unsigned char *)dd->port->log_buf;
3429                 if (buf[259] & 0x1) {
3430                         dev_info(&dd->pdev->dev,
3431                                 "Write protect bit is set.\n");
3432                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
3433                 }
3434                 if (buf[288] == 0xF7) {
3435                         dev_info(&dd->pdev->dev,
3436                                 "Exceeded Tmax, drive in thermal shutdown.\n");
3437                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
3438                 }
3439                 if (buf[288] == 0xBF) {
3440                         dev_info(&dd->pdev->dev,
3441                                 "Drive indicates rebuild has failed.\n");
3442                         /* TODO */
3443                 }
3444         }
3445
3446         /* get write protect progess */
3447         memset(&attr242, 0, sizeof(struct smart_attr));
3448         if (mtip_get_smart_attr(dd->port, 242, &attr242))
3449                 dev_warn(&dd->pdev->dev,
3450                                 "Unable to check write protect progress\n");
3451         else
3452                 dev_info(&dd->pdev->dev,
3453                                 "Write protect progress: %u%% (%u blocks)\n",
3454                                 attr242.cur, le32_to_cpu(attr242.data));
3455         return rv;
3456
3457 out3:
3458         del_timer_sync(&dd->port->cmd_timer);
3459
3460         /* Disable interrupts on the HBA. */
3461         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3462                         dd->mmio + HOST_CTL);
3463
3464         /* Release the IRQ. */
3465         irq_set_affinity_hint(dd->pdev->irq, NULL);
3466         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3467
3468 out2:
3469         mtip_deinit_port(dd->port);
3470
3471         /* Free the command/command header memory. */
3472         dmam_free_coherent(&dd->pdev->dev,
3473                                 HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3474                                 dd->port->command_list,
3475                                 dd->port->command_list_dma);
3476 out1:
3477         /* Free the memory allocated for the for structure. */
3478         kfree(dd->port);
3479
3480         return rv;
3481 }
3482
3483 /*
3484  * Called to deinitialize an interface.
3485  *
3486  * @dd Pointer to the driver data structure.
3487  *
3488  * return value
3489  *      0
3490  */
3491 static int mtip_hw_exit(struct driver_data *dd)
3492 {
3493         /*
3494          * Send standby immediate (E0h) to the drive so that it
3495          * saves its state.
3496          */
3497         if (!test_bit(MTIP_DDF_CLEANUP_BIT, &dd->dd_flag)) {
3498
3499                 if (!test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags))
3500                         if (mtip_standby_immediate(dd->port))
3501                                 dev_warn(&dd->pdev->dev,
3502                                         "STANDBY IMMEDIATE failed\n");
3503
3504                 /* de-initialize the port. */
3505                 mtip_deinit_port(dd->port);
3506
3507                 /* Disable interrupts on the HBA. */
3508                 writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3509                                 dd->mmio + HOST_CTL);
3510         }
3511
3512         del_timer_sync(&dd->port->cmd_timer);
3513
3514         /* Release the IRQ. */
3515         irq_set_affinity_hint(dd->pdev->irq, NULL);
3516         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3517
3518         /* Free the command/command header memory. */
3519         dmam_free_coherent(&dd->pdev->dev,
3520                         HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3521                         dd->port->command_list,
3522                         dd->port->command_list_dma);
3523         /* Free the memory allocated for the for structure. */
3524         kfree(dd->port);
3525
3526         return 0;
3527 }
3528
3529 /*
3530  * Issue a Standby Immediate command to the device.
3531  *
3532  * This function is called by the Block Layer just before the
3533  * system powers off during a shutdown.
3534  *
3535  * @dd Pointer to the driver data structure.
3536  *
3537  * return value
3538  *      0
3539  */
3540 static int mtip_hw_shutdown(struct driver_data *dd)
3541 {
3542         /*
3543          * Send standby immediate (E0h) to the drive so that it
3544          * saves its state.
3545          */
3546         mtip_standby_immediate(dd->port);
3547
3548         return 0;
3549 }
3550
3551 /*
3552  * Suspend function
3553  *
3554  * This function is called by the Block Layer just before the
3555  * system hibernates.
3556  *
3557  * @dd Pointer to the driver data structure.
3558  *
3559  * return value
3560  *      0       Suspend was successful
3561  *      -EFAULT Suspend was not successful
3562  */
3563 static int mtip_hw_suspend(struct driver_data *dd)
3564 {
3565         /*
3566          * Send standby immediate (E0h) to the drive
3567          * so that it saves its state.
3568          */
3569         if (mtip_standby_immediate(dd->port) != 0) {
3570                 dev_err(&dd->pdev->dev,
3571                         "Failed standby-immediate command\n");
3572                 return -EFAULT;
3573         }
3574
3575         /* Disable interrupts on the HBA.*/
3576         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3577                         dd->mmio + HOST_CTL);
3578         mtip_deinit_port(dd->port);
3579
3580         return 0;
3581 }
3582
3583 /*
3584  * Resume function
3585  *
3586  * This function is called by the Block Layer as the
3587  * system resumes.
3588  *
3589  * @dd Pointer to the driver data structure.
3590  *
3591  * return value
3592  *      0       Resume was successful
3593  *      -EFAULT Resume was not successful
3594  */
3595 static int mtip_hw_resume(struct driver_data *dd)
3596 {
3597         /* Perform any needed hardware setup steps */
3598         hba_setup(dd);
3599
3600         /* Reset the HBA */
3601         if (mtip_hba_reset(dd) != 0) {
3602                 dev_err(&dd->pdev->dev,
3603                         "Unable to reset the HBA\n");
3604                 return -EFAULT;
3605         }
3606
3607         /*
3608          * Enable the port, DMA engine, and FIS reception specific
3609          * h/w in controller.
3610          */
3611         mtip_init_port(dd->port);
3612         mtip_start_port(dd->port);
3613
3614         /* Enable interrupts on the HBA.*/
3615         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3616                         dd->mmio + HOST_CTL);
3617
3618         return 0;
3619 }
3620
3621 /*
3622  * Helper function for reusing disk name
3623  * upon hot insertion.
3624  */
3625 static int rssd_disk_name_format(char *prefix,
3626                                  int index,
3627                                  char *buf,
3628                                  int buflen)
3629 {
3630         const int base = 'z' - 'a' + 1;
3631         char *begin = buf + strlen(prefix);
3632         char *end = buf + buflen;
3633         char *p;
3634         int unit;
3635
3636         p = end - 1;
3637         *p = '\0';
3638         unit = base;
3639         do {
3640                 if (p == begin)
3641                         return -EINVAL;
3642                 *--p = 'a' + (index % unit);
3643                 index = (index / unit) - 1;
3644         } while (index >= 0);
3645
3646         memmove(begin, p, end - p);
3647         memcpy(buf, prefix, strlen(prefix));
3648
3649         return 0;
3650 }
3651
3652 /*
3653  * Block layer IOCTL handler.
3654  *
3655  * @dev Pointer to the block_device structure.
3656  * @mode ignored
3657  * @cmd IOCTL command passed from the user application.
3658  * @arg Argument passed from the user application.
3659  *
3660  * return value
3661  *      0        IOCTL completed successfully.
3662  *      -ENOTTY  IOCTL not supported or invalid driver data
3663  *                 structure pointer.
3664  */
3665 static int mtip_block_ioctl(struct block_device *dev,
3666                             fmode_t mode,
3667                             unsigned cmd,
3668                             unsigned long arg)
3669 {
3670         struct driver_data *dd = dev->bd_disk->private_data;
3671
3672         if (!capable(CAP_SYS_ADMIN))
3673                 return -EACCES;
3674
3675         if (!dd)
3676                 return -ENOTTY;
3677
3678         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3679                 return -ENOTTY;
3680
3681         switch (cmd) {
3682         case BLKFLSBUF:
3683                 return -ENOTTY;
3684         default:
3685                 return mtip_hw_ioctl(dd, cmd, arg);
3686         }
3687 }
3688
3689 #ifdef CONFIG_COMPAT
3690 /*
3691  * Block layer compat IOCTL handler.
3692  *
3693  * @dev Pointer to the block_device structure.
3694  * @mode ignored
3695  * @cmd IOCTL command passed from the user application.
3696  * @arg Argument passed from the user application.
3697  *
3698  * return value
3699  *      0        IOCTL completed successfully.
3700  *      -ENOTTY  IOCTL not supported or invalid driver data
3701  *                 structure pointer.
3702  */
3703 static int mtip_block_compat_ioctl(struct block_device *dev,
3704                             fmode_t mode,
3705                             unsigned cmd,
3706                             unsigned long arg)
3707 {
3708         struct driver_data *dd = dev->bd_disk->private_data;
3709
3710         if (!capable(CAP_SYS_ADMIN))
3711                 return -EACCES;
3712
3713         if (!dd)
3714                 return -ENOTTY;
3715
3716         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3717                 return -ENOTTY;
3718
3719         switch (cmd) {
3720         case BLKFLSBUF:
3721                 return -ENOTTY;
3722         case HDIO_DRIVE_TASKFILE: {
3723                 struct mtip_compat_ide_task_request_s __user *compat_req_task;
3724                 ide_task_request_t req_task;
3725                 int compat_tasksize, outtotal, ret;
3726
3727                 compat_tasksize =
3728                         sizeof(struct mtip_compat_ide_task_request_s);
3729
3730                 compat_req_task =
3731                         (struct mtip_compat_ide_task_request_s __user *) arg;
3732
3733                 if (copy_from_user(&req_task, (void __user *) arg,
3734                         compat_tasksize - (2 * sizeof(compat_long_t))))
3735                         return -EFAULT;
3736
3737                 if (get_user(req_task.out_size, &compat_req_task->out_size))
3738                         return -EFAULT;
3739
3740                 if (get_user(req_task.in_size, &compat_req_task->in_size))
3741                         return -EFAULT;
3742
3743                 outtotal = sizeof(struct mtip_compat_ide_task_request_s);
3744
3745                 ret = exec_drive_taskfile(dd, (void __user *) arg,
3746                                                 &req_task, outtotal);
3747
3748                 if (copy_to_user((void __user *) arg, &req_task,
3749                                 compat_tasksize -
3750                                 (2 * sizeof(compat_long_t))))
3751                         return -EFAULT;
3752
3753                 if (put_user(req_task.out_size, &compat_req_task->out_size))
3754                         return -EFAULT;
3755
3756                 if (put_user(req_task.in_size, &compat_req_task->in_size))
3757                         return -EFAULT;
3758
3759                 return ret;
3760         }
3761         default:
3762                 return mtip_hw_ioctl(dd, cmd, arg);
3763         }
3764 }
3765 #endif
3766
3767 /*
3768  * Obtain the geometry of the device.
3769  *
3770  * You may think that this function is obsolete, but some applications,
3771  * fdisk for example still used CHS values. This function describes the
3772  * device as having 224 heads and 56 sectors per cylinder. These values are
3773  * chosen so that each cylinder is aligned on a 4KB boundary. Since a
3774  * partition is described in terms of a start and end cylinder this means
3775  * that each partition is also 4KB aligned. Non-aligned partitions adversely
3776  * affects performance.
3777  *
3778  * @dev Pointer to the block_device strucutre.
3779  * @geo Pointer to a hd_geometry structure.
3780  *
3781  * return value
3782  *      0       Operation completed successfully.
3783  *      -ENOTTY An error occurred while reading the drive capacity.
3784  */
3785 static int mtip_block_getgeo(struct block_device *dev,
3786                                 struct hd_geometry *geo)
3787 {
3788         struct driver_data *dd = dev->bd_disk->private_data;
3789         sector_t capacity;
3790
3791         if (!dd)
3792                 return -ENOTTY;
3793
3794         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3795                 dev_warn(&dd->pdev->dev,
3796                         "Could not get drive capacity.\n");
3797                 return -ENOTTY;
3798         }
3799
3800         geo->heads = 224;
3801         geo->sectors = 56;
3802         sector_div(capacity, (geo->heads * geo->sectors));
3803         geo->cylinders = capacity;
3804         return 0;
3805 }
3806
3807 /*
3808  * Block device operation function.
3809  *
3810  * This structure contains pointers to the functions required by the block
3811  * layer.
3812  */
3813 static const struct block_device_operations mtip_block_ops = {
3814         .ioctl          = mtip_block_ioctl,
3815 #ifdef CONFIG_COMPAT
3816         .compat_ioctl   = mtip_block_compat_ioctl,
3817 #endif
3818         .getgeo         = mtip_block_getgeo,
3819         .owner          = THIS_MODULE
3820 };
3821
3822 /*
3823  * Block layer make request function.
3824  *
3825  * This function is called by the kernel to process a BIO for
3826  * the P320 device.
3827  *
3828  * @queue Pointer to the request queue. Unused other than to obtain
3829  *              the driver data structure.
3830  * @bio   Pointer to the BIO.
3831  *
3832  */
3833 static void mtip_make_request(struct request_queue *queue, struct bio *bio)
3834 {
3835         struct driver_data *dd = queue->queuedata;
3836         struct scatterlist *sg;
3837         struct bio_vec *bvec;
3838         int nents = 0;
3839         int tag = 0;
3840
3841         if (unlikely(dd->dd_flag & MTIP_DDF_STOP_IO)) {
3842                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
3843                                                         &dd->dd_flag))) {
3844                         bio_endio(bio, -ENXIO);
3845                         return;
3846                 }
3847                 if (unlikely(test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))) {
3848                         bio_endio(bio, -ENODATA);
3849                         return;
3850                 }
3851                 if (unlikely(test_bit(MTIP_DDF_WRITE_PROTECT_BIT,
3852                                                         &dd->dd_flag) &&
3853                                 bio_data_dir(bio))) {
3854                         bio_endio(bio, -ENODATA);
3855                         return;
3856                 }
3857                 if (unlikely(test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag))) {
3858                         bio_endio(bio, -ENODATA);
3859                         return;
3860                 }
3861         }
3862
3863         if (unlikely(bio->bi_rw & REQ_DISCARD)) {
3864                 bio_endio(bio, mtip_send_trim(dd, bio->bi_sector,
3865                                                 bio_sectors(bio)));
3866                 return;
3867         }
3868
3869         if (unlikely(!bio_has_data(bio))) {
3870                 blk_queue_flush(queue, 0);
3871                 bio_endio(bio, 0);
3872                 return;
3873         }
3874
3875         sg = mtip_hw_get_scatterlist(dd, &tag);
3876         if (likely(sg != NULL)) {
3877                 blk_queue_bounce(queue, &bio);
3878
3879                 if (unlikely((bio)->bi_vcnt > MTIP_MAX_SG)) {
3880                         dev_warn(&dd->pdev->dev,
3881                                 "Maximum number of SGL entries exceeded\n");
3882                         bio_io_error(bio);
3883                         mtip_hw_release_scatterlist(dd, tag);
3884                         return;
3885                 }
3886
3887                 /* Create the scatter list for this bio. */
3888                 bio_for_each_segment(bvec, bio, nents) {
3889                         sg_set_page(&sg[nents],
3890                                         bvec->bv_page,
3891                                         bvec->bv_len,
3892                                         bvec->bv_offset);
3893                 }
3894
3895                 /* Issue the read/write. */
3896                 mtip_hw_submit_io(dd,
3897                                 bio->bi_sector,
3898                                 bio_sectors(bio),
3899                                 nents,
3900                                 tag,
3901                                 bio_endio,
3902                                 bio,
3903                                 bio_data_dir(bio));
3904         } else
3905                 bio_io_error(bio);
3906 }
3907
3908 /*
3909  * Block layer initialization function.
3910  *
3911  * This function is called once by the PCI layer for each P320
3912  * device that is connected to the system.
3913  *
3914  * @dd Pointer to the driver data structure.
3915  *
3916  * return value
3917  *      0 on success else an error code.
3918  */
3919 static int mtip_block_initialize(struct driver_data *dd)
3920 {
3921         int rv = 0, wait_for_rebuild = 0;
3922         sector_t capacity;
3923         unsigned int index = 0;
3924         struct kobject *kobj;
3925         unsigned char thd_name[16];
3926
3927         if (dd->disk)
3928                 goto skip_create_disk; /* hw init done, before rebuild */
3929
3930         /* Initialize the protocol layer. */
3931         wait_for_rebuild = mtip_hw_init(dd);
3932         if (wait_for_rebuild < 0) {
3933                 dev_err(&dd->pdev->dev,
3934                         "Protocol layer initialization failed\n");
3935                 rv = -EINVAL;
3936                 goto protocol_init_error;
3937         }
3938
3939         dd->disk = alloc_disk_node(MTIP_MAX_MINORS, dd->numa_node);
3940         if (dd->disk  == NULL) {
3941                 dev_err(&dd->pdev->dev,
3942                         "Unable to allocate gendisk structure\n");
3943                 rv = -EINVAL;
3944                 goto alloc_disk_error;
3945         }
3946
3947         /* Generate the disk name, implemented same as in sd.c */
3948         do {
3949                 if (!ida_pre_get(&rssd_index_ida, GFP_KERNEL))
3950                         goto ida_get_error;
3951
3952                 spin_lock(&rssd_index_lock);
3953                 rv = ida_get_new(&rssd_index_ida, &index);
3954                 spin_unlock(&rssd_index_lock);
3955         } while (rv == -EAGAIN);
3956
3957         if (rv)
3958                 goto ida_get_error;
3959
3960         rv = rssd_disk_name_format("rssd",
3961                                 index,
3962                                 dd->disk->disk_name,
3963                                 DISK_NAME_LEN);
3964         if (rv)
3965                 goto disk_index_error;
3966
3967         dd->disk->driverfs_dev  = &dd->pdev->dev;
3968         dd->disk->major         = dd->major;
3969         dd->disk->first_minor   = dd->instance * MTIP_MAX_MINORS;
3970         dd->disk->fops          = &mtip_block_ops;
3971         dd->disk->private_data  = dd;
3972         dd->index               = index;
3973
3974         /*
3975          * if rebuild pending, start the service thread, and delay the block
3976          * queue creation and add_disk()
3977          */
3978         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3979                 goto start_service_thread;
3980
3981 skip_create_disk:
3982         /* Allocate the request queue. */
3983         dd->queue = blk_alloc_queue_node(GFP_KERNEL, dd->numa_node);
3984         if (dd->queue == NULL) {
3985                 dev_err(&dd->pdev->dev,
3986                         "Unable to allocate request queue\n");
3987                 rv = -ENOMEM;
3988                 goto block_queue_alloc_init_error;
3989         }
3990
3991         /* Attach our request function to the request queue. */
3992         blk_queue_make_request(dd->queue, mtip_make_request);
3993
3994         dd->disk->queue         = dd->queue;
3995         dd->queue->queuedata    = dd;
3996
3997         /* Set device limits. */
3998         set_bit(QUEUE_FLAG_NONROT, &dd->queue->queue_flags);
3999         blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
4000         blk_queue_physical_block_size(dd->queue, 4096);
4001         blk_queue_max_hw_sectors(dd->queue, 0xffff);
4002         blk_queue_max_segment_size(dd->queue, 0x400000);
4003         blk_queue_io_min(dd->queue, 4096);
4004
4005         /*
4006          * write back cache is not supported in the device. FUA depends on
4007          * write back cache support, hence setting flush support to zero.
4008          */
4009         blk_queue_flush(dd->queue, 0);
4010
4011         /* Signal trim support */
4012         if (dd->trim_supp == true) {
4013                 set_bit(QUEUE_FLAG_DISCARD, &dd->queue->queue_flags);
4014                 dd->queue->limits.discard_granularity = 4096;
4015                 blk_queue_max_discard_sectors(dd->queue,
4016                         MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES);
4017                 dd->queue->limits.discard_zeroes_data = 0;
4018         }
4019
4020         /* Set the capacity of the device in 512 byte sectors. */
4021         if (!(mtip_hw_get_capacity(dd, &capacity))) {
4022                 dev_warn(&dd->pdev->dev,
4023                         "Could not read drive capacity\n");
4024                 rv = -EIO;
4025                 goto read_capacity_error;
4026         }
4027         set_capacity(dd->disk, capacity);
4028
4029         /* Enable the block device and add it to /dev */
4030         add_disk(dd->disk);
4031
4032         /*
4033          * Now that the disk is active, initialize any sysfs attributes
4034          * managed by the protocol layer.
4035          */
4036         kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
4037         if (kobj) {
4038                 mtip_hw_sysfs_init(dd, kobj);
4039                 kobject_put(kobj);
4040         }
4041         mtip_hw_debugfs_init(dd);
4042
4043         if (dd->mtip_svc_handler) {
4044                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4045                 return rv; /* service thread created for handling rebuild */
4046         }
4047
4048 start_service_thread:
4049         sprintf(thd_name, "mtip_svc_thd_%02d", index);
4050         dd->mtip_svc_handler = kthread_create_on_node(mtip_service_thread,
4051                                                 dd, dd->numa_node, thd_name);
4052
4053         if (IS_ERR(dd->mtip_svc_handler)) {
4054                 dev_err(&dd->pdev->dev, "service thread failed to start\n");
4055                 dd->mtip_svc_handler = NULL;
4056                 rv = -EFAULT;
4057                 goto kthread_run_error;
4058         }
4059         wake_up_process(dd->mtip_svc_handler);
4060         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
4061                 rv = wait_for_rebuild;
4062
4063         return rv;
4064
4065 kthread_run_error:
4066         mtip_hw_debugfs_exit(dd);
4067
4068         /* Delete our gendisk. This also removes the device from /dev */
4069         del_gendisk(dd->disk);
4070
4071 read_capacity_error:
4072         blk_cleanup_queue(dd->queue);
4073
4074 block_queue_alloc_init_error:
4075 disk_index_error:
4076         spin_lock(&rssd_index_lock);
4077         ida_remove(&rssd_index_ida, index);
4078         spin_unlock(&rssd_index_lock);
4079
4080 ida_get_error:
4081         put_disk(dd->disk);
4082
4083 alloc_disk_error:
4084         mtip_hw_exit(dd); /* De-initialize the protocol layer. */
4085
4086 protocol_init_error:
4087         return rv;
4088 }
4089
4090 /*
4091  * Block layer deinitialization function.
4092  *
4093  * Called by the PCI layer as each P320 device is removed.
4094  *
4095  * @dd Pointer to the driver data structure.
4096  *
4097  * return value
4098  *      0
4099  */
4100 static int mtip_block_remove(struct driver_data *dd)
4101 {
4102         struct kobject *kobj;
4103
4104         if (dd->mtip_svc_handler) {
4105                 set_bit(MTIP_PF_SVC_THD_STOP_BIT, &dd->port->flags);
4106                 wake_up_interruptible(&dd->port->svc_wait);
4107                 kthread_stop(dd->mtip_svc_handler);
4108         }
4109
4110         /* Clean up the sysfs attributes, if created */
4111         if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag)) {
4112                 kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
4113                 if (kobj) {
4114                         mtip_hw_sysfs_exit(dd, kobj);
4115                         kobject_put(kobj);
4116                 }
4117         }
4118         mtip_hw_debugfs_exit(dd);
4119
4120         /*
4121          * Delete our gendisk structure. This also removes the device
4122          * from /dev
4123          */
4124         if (dd->disk) {
4125                 if (dd->disk->queue)
4126                         del_gendisk(dd->disk);
4127                 else
4128                         put_disk(dd->disk);
4129         }
4130
4131         spin_lock(&rssd_index_lock);
4132         ida_remove(&rssd_index_ida, dd->index);
4133         spin_unlock(&rssd_index_lock);
4134
4135         blk_cleanup_queue(dd->queue);
4136         dd->disk  = NULL;
4137         dd->queue = NULL;
4138
4139         /* De-initialize the protocol layer. */
4140         mtip_hw_exit(dd);
4141
4142         return 0;
4143 }
4144
4145 /*
4146  * Function called by the PCI layer when just before the
4147  * machine shuts down.
4148  *
4149  * If a protocol layer shutdown function is present it will be called
4150  * by this function.
4151  *
4152  * @dd Pointer to the driver data structure.
4153  *
4154  * return value
4155  *      0
4156  */
4157 static int mtip_block_shutdown(struct driver_data *dd)
4158 {
4159         dev_info(&dd->pdev->dev,
4160                 "Shutting down %s ...\n", dd->disk->disk_name);
4161
4162         /* Delete our gendisk structure, and cleanup the blk queue. */
4163         if (dd->disk) {
4164                 if (dd->disk->queue)
4165                         del_gendisk(dd->disk);
4166                 else
4167                         put_disk(dd->disk);
4168         }
4169
4170
4171         spin_lock(&rssd_index_lock);
4172         ida_remove(&rssd_index_ida, dd->index);
4173         spin_unlock(&rssd_index_lock);
4174
4175         blk_cleanup_queue(dd->queue);
4176         dd->disk  = NULL;
4177         dd->queue = NULL;
4178
4179         mtip_hw_shutdown(dd);
4180         return 0;
4181 }
4182
4183 static int mtip_block_suspend(struct driver_data *dd)
4184 {
4185         dev_info(&dd->pdev->dev,
4186                 "Suspending %s ...\n", dd->disk->disk_name);
4187         mtip_hw_suspend(dd);
4188         return 0;
4189 }
4190
4191 static int mtip_block_resume(struct driver_data *dd)
4192 {
4193         dev_info(&dd->pdev->dev, "Resuming %s ...\n",
4194                 dd->disk->disk_name);
4195         mtip_hw_resume(dd);
4196         return 0;
4197 }
4198
4199 static void drop_cpu(int cpu)
4200 {
4201         cpu_use[cpu]--;
4202 }
4203
4204 static int get_least_used_cpu_on_node(int node)
4205 {
4206         int cpu, least_used_cpu, least_cnt;
4207         const struct cpumask *node_mask;
4208
4209         node_mask = cpumask_of_node(node);
4210         least_used_cpu = cpumask_first(node_mask);
4211         least_cnt = cpu_use[least_used_cpu];
4212         cpu = least_used_cpu;
4213
4214         for_each_cpu(cpu, node_mask) {
4215                 if (cpu_use[cpu] < least_cnt) {
4216                         least_used_cpu = cpu;
4217                         least_cnt = cpu_use[cpu];
4218                 }
4219         }
4220         cpu_use[least_used_cpu]++;
4221         return least_used_cpu;
4222 }
4223
4224 /* Helper for selecting a node in round robin mode */
4225 static inline int mtip_get_next_rr_node(void)
4226 {
4227         static int next_node = -1;
4228
4229         if (next_node == -1) {
4230                 next_node = first_online_node;
4231                 return next_node;
4232         }
4233
4234         next_node = next_online_node(next_node);
4235         if (next_node == MAX_NUMNODES)
4236                 next_node = first_online_node;
4237         return next_node;
4238 }
4239
4240 static DEFINE_HANDLER(0);
4241 static DEFINE_HANDLER(1);
4242 static DEFINE_HANDLER(2);
4243 static DEFINE_HANDLER(3);
4244 static DEFINE_HANDLER(4);
4245 static DEFINE_HANDLER(5);
4246 static DEFINE_HANDLER(6);
4247 static DEFINE_HANDLER(7);
4248
4249 /*
4250  * Called for each supported PCI device detected.
4251  *
4252  * This function allocates the private data structure, enables the
4253  * PCI device and then calls the block layer initialization function.
4254  *
4255  * return value
4256  *      0 on success else an error code.
4257  */
4258 static int mtip_pci_probe(struct pci_dev *pdev,
4259                         const struct pci_device_id *ent)
4260 {
4261         int rv = 0;
4262         struct driver_data *dd = NULL;
4263         char cpu_list[256];
4264         const struct cpumask *node_mask;
4265         int cpu, i = 0, j = 0;
4266         int my_node = NUMA_NO_NODE;
4267         unsigned long flags;
4268
4269         /* Allocate memory for this devices private data. */
4270         my_node = pcibus_to_node(pdev->bus);
4271         if (my_node != NUMA_NO_NODE) {
4272                 if (!node_online(my_node))
4273                         my_node = mtip_get_next_rr_node();
4274         } else {
4275                 dev_info(&pdev->dev, "Kernel not reporting proximity, choosing a node\n");
4276                 my_node = mtip_get_next_rr_node();
4277         }
4278         dev_info(&pdev->dev, "NUMA node %d (closest: %d,%d, probe on %d:%d)\n",
4279                 my_node, pcibus_to_node(pdev->bus), dev_to_node(&pdev->dev),
4280                 cpu_to_node(smp_processor_id()), smp_processor_id());
4281
4282         dd = kzalloc_node(sizeof(struct driver_data), GFP_KERNEL, my_node);
4283         if (dd == NULL) {
4284                 dev_err(&pdev->dev,
4285                         "Unable to allocate memory for driver data\n");
4286                 return -ENOMEM;
4287         }
4288
4289         /* Attach the private data to this PCI device.  */
4290         pci_set_drvdata(pdev, dd);
4291
4292         rv = pcim_enable_device(pdev);
4293         if (rv < 0) {
4294                 dev_err(&pdev->dev, "Unable to enable device\n");
4295                 goto iomap_err;
4296         }
4297
4298         /* Map BAR5 to memory. */
4299         rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME);
4300         if (rv < 0) {
4301                 dev_err(&pdev->dev, "Unable to map regions\n");
4302                 goto iomap_err;
4303         }
4304
4305         if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
4306                 rv = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
4307
4308                 if (rv) {
4309                         rv = pci_set_consistent_dma_mask(pdev,
4310                                                 DMA_BIT_MASK(32));
4311                         if (rv) {
4312                                 dev_warn(&pdev->dev,
4313                                         "64-bit DMA enable failed\n");
4314                                 goto setmask_err;
4315                         }
4316                 }
4317         }
4318
4319         /* Copy the info we may need later into the private data structure. */
4320         dd->major       = mtip_major;
4321         dd->instance    = instance;
4322         dd->pdev        = pdev;
4323         dd->numa_node   = my_node;
4324
4325         INIT_LIST_HEAD(&dd->online_list);
4326         INIT_LIST_HEAD(&dd->remove_list);
4327
4328         memset(dd->workq_name, 0, 32);
4329         snprintf(dd->workq_name, 31, "mtipq%d", dd->instance);
4330
4331         dd->isr_workq = create_workqueue(dd->workq_name);
4332         if (!dd->isr_workq) {
4333                 dev_warn(&pdev->dev, "Can't create wq %d\n", dd->instance);
4334                 rv = -ENOMEM;
4335                 goto block_initialize_err;
4336         }
4337
4338         memset(cpu_list, 0, sizeof(cpu_list));
4339
4340         node_mask = cpumask_of_node(dd->numa_node);
4341         if (!cpumask_empty(node_mask)) {
4342                 for_each_cpu(cpu, node_mask)
4343                 {
4344                         snprintf(&cpu_list[j], 256 - j, "%d ", cpu);
4345                         j = strlen(cpu_list);
4346                 }
4347
4348                 dev_info(&pdev->dev, "Node %d on package %d has %d cpu(s): %s\n",
4349                         dd->numa_node,
4350                         topology_physical_package_id(cpumask_first(node_mask)),
4351                         nr_cpus_node(dd->numa_node),
4352                         cpu_list);
4353         } else
4354                 dev_dbg(&pdev->dev, "mtip32xx: node_mask empty\n");
4355
4356         dd->isr_binding = get_least_used_cpu_on_node(dd->numa_node);
4357         dev_info(&pdev->dev, "Initial IRQ binding node:cpu %d:%d\n",
4358                 cpu_to_node(dd->isr_binding), dd->isr_binding);
4359
4360         /* first worker context always runs in ISR */
4361         dd->work[0].cpu_binding = dd->isr_binding;
4362         dd->work[1].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4363         dd->work[2].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4364         dd->work[3].cpu_binding = dd->work[0].cpu_binding;
4365         dd->work[4].cpu_binding = dd->work[1].cpu_binding;
4366         dd->work[5].cpu_binding = dd->work[2].cpu_binding;
4367         dd->work[6].cpu_binding = dd->work[2].cpu_binding;
4368         dd->work[7].cpu_binding = dd->work[1].cpu_binding;
4369
4370         /* Log the bindings */
4371         for_each_present_cpu(cpu) {
4372                 memset(cpu_list, 0, sizeof(cpu_list));
4373                 for (i = 0, j = 0; i < MTIP_MAX_SLOT_GROUPS; i++) {
4374                         if (dd->work[i].cpu_binding == cpu) {
4375                                 snprintf(&cpu_list[j], 256 - j, "%d ", i);
4376                                 j = strlen(cpu_list);
4377                         }
4378                 }
4379                 if (j)
4380                         dev_info(&pdev->dev, "CPU %d: WQs %s\n", cpu, cpu_list);
4381         }
4382
4383         INIT_WORK(&dd->work[0].work, mtip_workq_sdbf0);
4384         INIT_WORK(&dd->work[1].work, mtip_workq_sdbf1);
4385         INIT_WORK(&dd->work[2].work, mtip_workq_sdbf2);
4386         INIT_WORK(&dd->work[3].work, mtip_workq_sdbf3);
4387         INIT_WORK(&dd->work[4].work, mtip_workq_sdbf4);
4388         INIT_WORK(&dd->work[5].work, mtip_workq_sdbf5);
4389         INIT_WORK(&dd->work[6].work, mtip_workq_sdbf6);
4390         INIT_WORK(&dd->work[7].work, mtip_workq_sdbf7);
4391
4392         pci_set_master(pdev);
4393         rv = pci_enable_msi(pdev);
4394         if (rv) {
4395                 dev_warn(&pdev->dev,
4396                         "Unable to enable MSI interrupt.\n");
4397                 goto block_initialize_err;
4398         }
4399
4400         /* Initialize the block layer. */
4401         rv = mtip_block_initialize(dd);
4402         if (rv < 0) {
4403                 dev_err(&pdev->dev,
4404                         "Unable to initialize block layer\n");
4405                 goto block_initialize_err;
4406         }
4407
4408         /*
4409          * Increment the instance count so that each device has a unique
4410          * instance number.
4411          */
4412         instance++;
4413         if (rv != MTIP_FTL_REBUILD_MAGIC)
4414                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4415         else
4416                 rv = 0; /* device in rebuild state, return 0 from probe */
4417
4418         /* Add to online list even if in ftl rebuild */
4419         spin_lock_irqsave(&dev_lock, flags);
4420         list_add(&dd->online_list, &online_list);
4421         spin_unlock_irqrestore(&dev_lock, flags);
4422
4423         goto done;
4424
4425 block_initialize_err:
4426         pci_disable_msi(pdev);
4427         if (dd->isr_workq) {
4428                 flush_workqueue(dd->isr_workq);
4429                 destroy_workqueue(dd->isr_workq);
4430                 drop_cpu(dd->work[0].cpu_binding);
4431                 drop_cpu(dd->work[1].cpu_binding);
4432                 drop_cpu(dd->work[2].cpu_binding);
4433         }
4434 setmask_err:
4435         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4436
4437 iomap_err:
4438         kfree(dd);
4439         pci_set_drvdata(pdev, NULL);
4440         return rv;
4441 done:
4442         return rv;
4443 }
4444
4445 /*
4446  * Called for each probed device when the device is removed or the
4447  * driver is unloaded.
4448  *
4449  * return value
4450  *      None
4451  */
4452 static void mtip_pci_remove(struct pci_dev *pdev)
4453 {
4454         struct driver_data *dd = pci_get_drvdata(pdev);
4455         int counter = 0;
4456         unsigned long flags;
4457
4458         set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
4459
4460         spin_lock_irqsave(&dev_lock, flags);
4461         list_del_init(&dd->online_list);
4462         list_add(&dd->remove_list, &removing_list);
4463         spin_unlock_irqrestore(&dev_lock, flags);
4464
4465         if (mtip_check_surprise_removal(pdev)) {
4466                 while (!test_bit(MTIP_DDF_CLEANUP_BIT, &dd->dd_flag)) {
4467                         counter++;
4468                         msleep(20);
4469                         if (counter == 10) {
4470                                 /* Cleanup the outstanding commands */
4471                                 mtip_command_cleanup(dd);
4472                                 break;
4473                         }
4474                 }
4475         }
4476
4477         /* Clean up the block layer. */
4478         mtip_block_remove(dd);
4479
4480         if (dd->isr_workq) {
4481                 flush_workqueue(dd->isr_workq);
4482                 destroy_workqueue(dd->isr_workq);
4483                 drop_cpu(dd->work[0].cpu_binding);
4484                 drop_cpu(dd->work[1].cpu_binding);
4485                 drop_cpu(dd->work[2].cpu_binding);
4486         }
4487
4488         pci_disable_msi(pdev);
4489
4490         spin_lock_irqsave(&dev_lock, flags);
4491         list_del_init(&dd->remove_list);
4492         spin_unlock_irqrestore(&dev_lock, flags);
4493
4494         kfree(dd);
4495         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4496 }
4497
4498 /*
4499  * Called for each probed device when the device is suspended.
4500  *
4501  * return value
4502  *      0  Success
4503  *      <0 Error
4504  */
4505 static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
4506 {
4507         int rv = 0;
4508         struct driver_data *dd = pci_get_drvdata(pdev);
4509
4510         if (!dd) {
4511                 dev_err(&pdev->dev,
4512                         "Driver private datastructure is NULL\n");
4513                 return -EFAULT;
4514         }
4515
4516         set_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4517
4518         /* Disable ports & interrupts then send standby immediate */
4519         rv = mtip_block_suspend(dd);
4520         if (rv < 0) {
4521                 dev_err(&pdev->dev,
4522                         "Failed to suspend controller\n");
4523                 return rv;
4524         }
4525
4526         /*
4527          * Save the pci config space to pdev structure &
4528          * disable the device
4529          */
4530         pci_save_state(pdev);
4531         pci_disable_device(pdev);
4532
4533         /* Move to Low power state*/
4534         pci_set_power_state(pdev, PCI_D3hot);
4535
4536         return rv;
4537 }
4538
4539 /*
4540  * Called for each probed device when the device is resumed.
4541  *
4542  * return value
4543  *      0  Success
4544  *      <0 Error
4545  */
4546 static int mtip_pci_resume(struct pci_dev *pdev)
4547 {
4548         int rv = 0;
4549         struct driver_data *dd;
4550
4551         dd = pci_get_drvdata(pdev);
4552         if (!dd) {
4553                 dev_err(&pdev->dev,
4554                         "Driver private datastructure is NULL\n");
4555                 return -EFAULT;
4556         }
4557
4558         /* Move the device to active State */
4559         pci_set_power_state(pdev, PCI_D0);
4560
4561         /* Restore PCI configuration space */
4562         pci_restore_state(pdev);
4563
4564         /* Enable the PCI device*/
4565         rv = pcim_enable_device(pdev);
4566         if (rv < 0) {
4567                 dev_err(&pdev->dev,
4568                         "Failed to enable card during resume\n");
4569                 goto err;
4570         }
4571         pci_set_master(pdev);
4572
4573         /*
4574          * Calls hbaReset, initPort, & startPort function
4575          * then enables interrupts
4576          */
4577         rv = mtip_block_resume(dd);
4578         if (rv < 0)
4579                 dev_err(&pdev->dev, "Unable to resume\n");
4580
4581 err:
4582         clear_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4583
4584         return rv;
4585 }
4586
4587 /*
4588  * Shutdown routine
4589  *
4590  * return value
4591  *      None
4592  */
4593 static void mtip_pci_shutdown(struct pci_dev *pdev)
4594 {
4595         struct driver_data *dd = pci_get_drvdata(pdev);
4596         if (dd)
4597                 mtip_block_shutdown(dd);
4598 }
4599
4600 /* Table of device ids supported by this driver. */
4601 static DEFINE_PCI_DEVICE_TABLE(mtip_pci_tbl) = {
4602         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320H_DEVICE_ID) },
4603         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320M_DEVICE_ID) },
4604         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320S_DEVICE_ID) },
4605         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P325M_DEVICE_ID) },
4606         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420H_DEVICE_ID) },
4607         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420M_DEVICE_ID) },
4608         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P425M_DEVICE_ID) },
4609         { 0 }
4610 };
4611
4612 /* Structure that describes the PCI driver functions. */
4613 static struct pci_driver mtip_pci_driver = {
4614         .name                   = MTIP_DRV_NAME,
4615         .id_table               = mtip_pci_tbl,
4616         .probe                  = mtip_pci_probe,
4617         .remove                 = mtip_pci_remove,
4618         .suspend                = mtip_pci_suspend,
4619         .resume                 = mtip_pci_resume,
4620         .shutdown               = mtip_pci_shutdown,
4621 };
4622
4623 MODULE_DEVICE_TABLE(pci, mtip_pci_tbl);
4624
4625 /*
4626  * Module initialization function.
4627  *
4628  * Called once when the module is loaded. This function allocates a major
4629  * block device number to the Cyclone devices and registers the PCI layer
4630  * of the driver.
4631  *
4632  * Return value
4633  *      0 on success else error code.
4634  */
4635 static int __init mtip_init(void)
4636 {
4637         int error;
4638
4639         pr_info(MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n");
4640
4641         spin_lock_init(&dev_lock);
4642
4643         INIT_LIST_HEAD(&online_list);
4644         INIT_LIST_HEAD(&removing_list);
4645
4646         /* Allocate a major block device number to use with this driver. */
4647         error = register_blkdev(0, MTIP_DRV_NAME);
4648         if (error <= 0) {
4649                 pr_err("Unable to register block device (%d)\n",
4650                 error);
4651                 return -EBUSY;
4652         }
4653         mtip_major = error;
4654
4655         dfs_parent = debugfs_create_dir("rssd", NULL);
4656         if (IS_ERR_OR_NULL(dfs_parent)) {
4657                 pr_warn("Error creating debugfs parent\n");
4658                 dfs_parent = NULL;
4659         }
4660         if (dfs_parent) {
4661                 dfs_device_status = debugfs_create_file("device_status",
4662                                         S_IRUGO, dfs_parent, NULL,
4663                                         &mtip_device_status_fops);
4664                 if (IS_ERR_OR_NULL(dfs_device_status)) {
4665                         pr_err("Error creating device_status node\n");
4666                         dfs_device_status = NULL;
4667                 }
4668         }
4669
4670         /* Register our PCI operations. */
4671         error = pci_register_driver(&mtip_pci_driver);
4672         if (error) {
4673                 debugfs_remove(dfs_parent);
4674                 unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4675         }
4676
4677         return error;
4678 }
4679
4680 /*
4681  * Module de-initialization function.
4682  *
4683  * Called once when the module is unloaded. This function deallocates
4684  * the major block device number allocated by mtip_init() and
4685  * unregisters the PCI layer of the driver.
4686  *
4687  * Return value
4688  *      none
4689  */
4690 static void __exit mtip_exit(void)
4691 {
4692         debugfs_remove_recursive(dfs_parent);
4693
4694         /* Release the allocated major block device number. */
4695         unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4696
4697         /* Unregister the PCI driver. */
4698         pci_unregister_driver(&mtip_pci_driver);
4699 }
4700
4701 MODULE_AUTHOR("Micron Technology, Inc");
4702 MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
4703 MODULE_LICENSE("GPL");
4704 MODULE_VERSION(MTIP_DRV_VERSION);
4705
4706 module_init(mtip_init);
4707 module_exit(mtip_exit);