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         if (unlikely(command->unaligned))
 732                 up(&port->cmd_slot_unal);
 733         else
 734                 up(&port->cmd_slot);
 735 }
 736
 737 /*
 738  * Internal command completion callback function.
 739  *
 740  * This function is normally called by the driver ISR when an internal
 741  * command completed. This function signals the command completion by
 742  * calling complete().
 743  *
 744  * @port   Pointer to the port data structure.
 745  * @tag    Tag of the command that has completed.
 746  * @data   Pointer to a completion structure.
 747  * @status Completion status.
 748  *
 749  * return value
 750  *      None
 751  */
 752 static void mtip_completion(struct mtip_port *port,
 753                             int tag,
 754                             void *data,
 755                             int status)
 756 {
 757         struct mtip_cmd *command = &port->commands[tag];
 758         struct completion *waiting = data;
 759         if (unlikely(status == PORT_IRQ_TF_ERR))
 760                 dev_warn(&port->dd->pdev->dev,
 761                         "Internal command %d completed with TFE\n", tag);
 762
 763         command->async_callback = NULL;
 764         command->comp_func = NULL;
 765
 766         complete(waiting);
 767 }
 768
 769 static void mtip_null_completion(struct mtip_port *port,
 770                             int tag,
 771                             void *data,
 772                             int status)
 773 {
 774         return;
 775 }
 776
 777 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
 778                                 dma_addr_t buffer_dma, unsigned int sectors);
 779 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
 780                                                 struct smart_attr *attrib);
 781 /*
 782  * Handle an error.
 783  *
 784  * @dd Pointer to the DRIVER_DATA structure.
 785  *
 786  * return value
 787  *      None
 788  */
 789 static void mtip_handle_tfe(struct driver_data *dd)
 790 {
 791         int group, tag, bit, reissue, rv;
 792         struct mtip_port *port;
 793         struct mtip_cmd  *cmd;
 794         u32 completed;
 795         struct host_to_dev_fis *fis;
 796         unsigned long tagaccum[SLOTBITS_IN_LONGS];
 797         unsigned int cmd_cnt = 0;
 798         unsigned char *buf;
 799         char *fail_reason = NULL;
 800         int fail_all_ncq_write = 0, fail_all_ncq_cmds = 0;
 801
 802         dev_warn(&dd->pdev->dev, "Taskfile error\n");
 803
 804         port = dd->port;
 805
 806         /* Stop the timer to prevent command timeouts. */
 807         del_timer(&port->cmd_timer);
 808         set_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
 809
 810         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) &&
 811                         test_bit(MTIP_TAG_INTERNAL, port->allocated)) {
 812                 cmd = &port->commands[MTIP_TAG_INTERNAL];
 813                 dbg_printk(MTIP_DRV_NAME " TFE for the internal command\n");
 814
 815                 atomic_inc(&cmd->active); /* active > 1 indicates error */
 816                 if (cmd->comp_data && cmd->comp_func) {
 817                         cmd->comp_func(port, MTIP_TAG_INTERNAL,
 818                                         cmd->comp_data, PORT_IRQ_TF_ERR);
 819                 }
 820                 goto handle_tfe_exit;
 821         }
 822
 823         /* clear the tag accumulator */
 824         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 825
 826         /* Loop through all the groups */
 827         for (group = 0; group < dd->slot_groups; group++) {
 828                 completed = readl(port->completed[group]);
 829
 830                 /* clear completed status register in the hardware.*/
 831                 writel(completed, port->completed[group]);
 832
 833                 /* Process successfully completed commands */
 834                 for (bit = 0; bit < 32 && completed; bit++) {
 835                         if (!(completed & (1<<bit)))
 836                                 continue;
 837                         tag = (group << 5) + bit;
 838
 839                         /* Skip the internal command slot */
 840                         if (tag == MTIP_TAG_INTERNAL)
 841                                 continue;
 842
 843                         cmd = &port->commands[tag];
 844                         if (likely(cmd->comp_func)) {
 845                                 set_bit(tag, tagaccum);
 846                                 cmd_cnt++;
 847                                 atomic_set(&cmd->active, 0);
 848                                 cmd->comp_func(port,
 849                                          tag,
 850                                          cmd->comp_data,
 851                                          0);
 852                         } else {
 853                                 dev_err(&port->dd->pdev->dev,
 854                                         "Missing completion func for tag %d",
 855                                         tag);
 856                                 if (mtip_check_surprise_removal(dd->pdev)) {
 857                                         mtip_command_cleanup(dd);
 858                                         /* don't proceed further */
 859                                         return;
 860                                 }
 861                         }
 862                 }
 863         }
 864
 865         print_tags(dd, "completed (TFE)", tagaccum, cmd_cnt);
 866
 867         /* Restart the port */
 868         mdelay(20);
 869         mtip_restart_port(port);
 870
 871         /* Trying to determine the cause of the error */
 872         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
 873                                 dd->port->log_buf,
 874                                 dd->port->log_buf_dma, 1);
 875         if (rv) {
 876                 dev_warn(&dd->pdev->dev,
 877                         "Error in READ LOG EXT (10h) command\n");
 878                 /* non-critical error, don't fail the load */
 879         } else {
 880                 buf = (unsigned char *)dd->port->log_buf;
 881                 if (buf[259] & 0x1) {
 882                         dev_info(&dd->pdev->dev,
 883                                 "Write protect bit is set.\n");
 884                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
 885                         fail_all_ncq_write = 1;
 886                         fail_reason = "write protect";
 887                 }
 888                 if (buf[288] == 0xF7) {
 889                         dev_info(&dd->pdev->dev,
 890                                 "Exceeded Tmax, drive in thermal shutdown.\n");
 891                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
 892                         fail_all_ncq_cmds = 1;
 893                         fail_reason = "thermal shutdown";
 894                 }
 895                 if (buf[288] == 0xBF) {
 896                         dev_info(&dd->pdev->dev,
 897                                 "Drive indicates rebuild has failed.\n");
 898                         fail_all_ncq_cmds = 1;
 899                         fail_reason = "rebuild failed";
 900                 }
 901         }
 902
 903         /* clear the tag accumulator */
 904         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 905
 906         /* Loop through all the groups */
 907         for (group = 0; group < dd->slot_groups; group++) {
 908                 for (bit = 0; bit < 32; bit++) {
 909                         reissue = 1;
 910                         tag = (group << 5) + bit;
 911                         cmd = &port->commands[tag];
 912
 913                         /* If the active bit is set re-issue the command */
 914                         if (atomic_read(&cmd->active) == 0)
 915                                 continue;
 916
 917                         fis = (struct host_to_dev_fis *)cmd->command;
 918
 919                         /* Should re-issue? */
 920                         if (tag == MTIP_TAG_INTERNAL ||
 921                             fis->command == ATA_CMD_SET_FEATURES)
 922                                 reissue = 0;
 923                         else {
 924                                 if (fail_all_ncq_cmds ||
 925                                         (fail_all_ncq_write &&
 926                                         fis->command == ATA_CMD_FPDMA_WRITE)) {
 927                                         dev_warn(&dd->pdev->dev,
 928                                         "  Fail: %s w/tag %d [%s].\n",
 929                                         fis->command == ATA_CMD_FPDMA_WRITE ?
 930                                                 "write" : "read",
 931                                         tag,
 932                                         fail_reason != NULL ?
 933                                                 fail_reason : "unknown");
 934                                         atomic_set(&cmd->active, 0);
 935                                         if (cmd->comp_func) {
 936                                                 cmd->comp_func(port, tag,
 937                                                         cmd->comp_data,
 938                                                         -ENODATA);
 939                                         }
 940                                         continue;
 941                                 }
 942                         }
 943
 944                         /*
 945                          * First check if this command has
 946                          *  exceeded its retries.
 947                          */
 948                         if (reissue && (cmd->retries-- > 0)) {
 949
 950                                 set_bit(tag, tagaccum);
 951
 952                                 /* Re-issue the command. */
 953                                 mtip_issue_ncq_command(port, tag);
 954
 955                                 continue;
 956                         }
 957
 958                         /* Retire a command that will not be reissued */
 959                         dev_warn(&port->dd->pdev->dev,
 960                                 "retiring tag %d\n", tag);
 961                         atomic_set(&cmd->active, 0);
 962
 963                         if (cmd->comp_func)
 964                                 cmd->comp_func(
 965                                         port,
 966                                         tag,
 967                                         cmd->comp_data,
 968                                         PORT_IRQ_TF_ERR);
 969                         else
 970                                 dev_warn(&port->dd->pdev->dev,
 971                                         "Bad completion for tag %d\n",
 972                                         tag);
 973                 }
 974         }
 975         print_tags(dd, "reissued (TFE)", tagaccum, cmd_cnt);
 976
 977 handle_tfe_exit:
 978         /* clear eh_active */
 979         clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
 980         wake_up_interruptible(&port->svc_wait);
 981
 982         mod_timer(&port->cmd_timer,
 983                  jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
 984 }
 985
 986 /*
 987  * Handle a set device bits interrupt
 988  */
 989 static inline void mtip_workq_sdbfx(struct mtip_port *port, int group,
 990                                                         u32 completed)
 991 {
 992         struct driver_data *dd = port->dd;
 993         int tag, bit;
 994         struct mtip_cmd *command;
 995
 996         if (!completed) {
 997                 WARN_ON_ONCE(!completed);
 998                 return;
 999         }
1000         /* clear completed status register in the hardware.*/
1001         writel(completed, port->completed[group]);
1002
1003         /* Process completed commands. */
1004         for (bit = 0; (bit < 32) && completed; bit++) {
1005                 if (completed & 0x01) {
1006                         tag = (group << 5) | bit;
1007
1008                         /* skip internal command slot. */
1009                         if (unlikely(tag == MTIP_TAG_INTERNAL))
1010                                 continue;
1011
1012                         command = &port->commands[tag];
1013                         /* make internal callback */
1014                         if (likely(command->comp_func)) {
1015                                 command->comp_func(
1016                                         port,
1017                                         tag,
1018                                         command->comp_data,
1019                                         0);
1020                         } else {
1021                                 dev_warn(&dd->pdev->dev,
1022                                         "Null completion "
1023                                         "for tag %d",
1024                                         tag);
1025
1026                                 if (mtip_check_surprise_removal(
1027                                         dd->pdev)) {
1028                                         mtip_command_cleanup(dd);
1029                                         return;
1030                                 }
1031                         }
1032                 }
1033                 completed >>= 1;
1034         }
1035
1036         /* If last, re-enable interrupts */
1037         if (atomic_dec_return(&dd->irq_workers_active) == 0)
1038                 writel(0xffffffff, dd->mmio + HOST_IRQ_STAT);
1039 }
1040
1041 /*
1042  * Process legacy pio and d2h interrupts
1043  */
1044 static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat)
1045 {
1046         struct mtip_port *port = dd->port;
1047         struct mtip_cmd *cmd = &port->commands[MTIP_TAG_INTERNAL];
1048
1049         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) &&
1050             (cmd != NULL) && !(readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1051                 & (1 << MTIP_TAG_INTERNAL))) {
1052                 if (cmd->comp_func) {
1053                         cmd->comp_func(port,
1054                                 MTIP_TAG_INTERNAL,
1055                                 cmd->comp_data,
1056                                 0);
1057                         return;
1058                 }
1059         }
1060
1061         return;
1062 }
1063
1064 /*
1065  * Demux and handle errors
1066  */
1067 static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat)
1068 {
1069         if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR)))
1070                 mtip_handle_tfe(dd);
1071
1072         if (unlikely(port_stat & PORT_IRQ_CONNECT)) {
1073                 dev_warn(&dd->pdev->dev,
1074                         "Clearing PxSERR.DIAG.x\n");
1075                 writel((1 << 26), dd->port->mmio + PORT_SCR_ERR);
1076         }
1077
1078         if (unlikely(port_stat & PORT_IRQ_PHYRDY)) {
1079                 dev_warn(&dd->pdev->dev,
1080                         "Clearing PxSERR.DIAG.n\n");
1081                 writel((1 << 16), dd->port->mmio + PORT_SCR_ERR);
1082         }
1083
1084         if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) {
1085                 dev_warn(&dd->pdev->dev,
1086                         "Port stat errors %x unhandled\n",
1087                         (port_stat & ~PORT_IRQ_HANDLED));
1088         }
1089 }
1090
1091 static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
1092 {
1093         struct driver_data *dd = (struct driver_data *) data;
1094         struct mtip_port *port = dd->port;
1095         u32 hba_stat, port_stat;
1096         int rv = IRQ_NONE;
1097         int do_irq_enable = 1, i, workers;
1098         struct mtip_work *twork;
1099
1100         hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
1101         if (hba_stat) {
1102                 rv = IRQ_HANDLED;
1103
1104                 /* Acknowledge the interrupt status on the port.*/
1105                 port_stat = readl(port->mmio + PORT_IRQ_STAT);
1106                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
1107
1108                 /* Demux port status */
1109                 if (likely(port_stat & PORT_IRQ_SDB_FIS)) {
1110                         do_irq_enable = 0;
1111                         WARN_ON_ONCE(atomic_read(&dd->irq_workers_active) != 0);
1112
1113                         /* Start at 1: group zero is always local? */
1114                         for (i = 0, workers = 0; i < MTIP_MAX_SLOT_GROUPS;
1115                                                                         i++) {
1116                                 twork = &dd->work[i];
1117                                 twork->completed = readl(port->completed[i]);
1118                                 if (twork->completed)
1119                                         workers++;
1120                         }
1121
1122                         atomic_set(&dd->irq_workers_active, workers);
1123                         if (workers) {
1124                                 for (i = 1; i < MTIP_MAX_SLOT_GROUPS; i++) {
1125                                         twork = &dd->work[i];
1126                                         if (twork->completed)
1127                                                 queue_work_on(
1128                                                         twork->cpu_binding,
1129                                                         dd->isr_workq,
1130                                                         &twork->work);
1131                                 }
1132
1133                                 if (likely(dd->work[0].completed))
1134                                         mtip_workq_sdbfx(port, 0,
1135                                                         dd->work[0].completed);
1136
1137                         } else {
1138                                 /*
1139                                  * Chip quirk: SDB interrupt but nothing
1140                                  * to complete
1141                                  */
1142                                 do_irq_enable = 1;
1143                         }
1144                 }
1145
1146                 if (unlikely(port_stat & PORT_IRQ_ERR)) {
1147                         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
1148                                 mtip_command_cleanup(dd);
1149                                 /* don't proceed further */
1150                                 return IRQ_HANDLED;
1151                         }
1152                         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1153                                                         &dd->dd_flag))
1154                                 return rv;
1155
1156                         mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
1157                 }
1158
1159                 if (unlikely(port_stat & PORT_IRQ_LEGACY))
1160                         mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY);
1161         }
1162
1163         /* acknowledge interrupt */
1164         if (unlikely(do_irq_enable))
1165                 writel(hba_stat, dd->mmio + HOST_IRQ_STAT);
1166
1167         return rv;
1168 }
1169
1170 /*
1171  * HBA interrupt subroutine.
1172  *
1173  * @irq         IRQ number.
1174  * @instance    Pointer to the driver data structure.
1175  *
1176  * return value
1177  *      IRQ_HANDLED     A HBA interrupt was pending and handled.
1178  *      IRQ_NONE        This interrupt was not for the HBA.
1179  */
1180 static irqreturn_t mtip_irq_handler(int irq, void *instance)
1181 {
1182         struct driver_data *dd = instance;
1183
1184         return mtip_handle_irq(dd);
1185 }
1186
1187 static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
1188 {
1189         atomic_set(&port->commands[tag].active, 1);
1190         writel(1 << MTIP_TAG_BIT(tag),
1191                 port->cmd_issue[MTIP_TAG_INDEX(tag)]);
1192 }
1193
1194 static bool mtip_pause_ncq(struct mtip_port *port,
1195                                 struct host_to_dev_fis *fis)
1196 {
1197         struct host_to_dev_fis *reply;
1198         unsigned long task_file_data;
1199
1200         reply = port->rxfis + RX_FIS_D2H_REG;
1201         task_file_data = readl(port->mmio+PORT_TFDATA);
1202
1203         if (fis->command == ATA_CMD_SEC_ERASE_UNIT)
1204                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1205
1206         if ((task_file_data & 1))
1207                 return false;
1208
1209         if (fis->command == ATA_CMD_SEC_ERASE_PREP) {
1210                 set_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1211                 set_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1212                 port->ic_pause_timer = jiffies;
1213                 return true;
1214         } else if ((fis->command == ATA_CMD_DOWNLOAD_MICRO) &&
1215                                         (fis->features == 0x03)) {
1216                 set_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1217                 port->ic_pause_timer = jiffies;
1218                 return true;
1219         } else if ((fis->command == ATA_CMD_SEC_ERASE_UNIT) ||
1220                 ((fis->command == 0xFC) &&
1221                         (fis->features == 0x27 || fis->features == 0x72 ||
1222                          fis->features == 0x62 || fis->features == 0x26))) {
1223                 /* Com reset after secure erase or lowlevel format */
1224                 mtip_restart_port(port);
1225                 return false;
1226         }
1227
1228         return false;
1229 }
1230
1231 /*
1232  * Wait for port to quiesce
1233  *
1234  * @port    Pointer to port data structure
1235  * @timeout Max duration to wait (ms)
1236  *
1237  * return value
1238  *      0       Success
1239  *      -EBUSY  Commands still active
1240  */
1241 static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
1242 {
1243         unsigned long to;
1244         unsigned int n;
1245         unsigned int active = 1;
1246
1247         to = jiffies + msecs_to_jiffies(timeout);
1248         do {
1249                 if (test_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags) &&
1250                         test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
1251                         msleep(20);
1252                         continue; /* svc thd is actively issuing commands */
1253                 }
1254                 if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1255                         return -EFAULT;
1256                 /*
1257                  * Ignore s_active bit 0 of array element 0.
1258                  * This bit will always be set
1259                  */
1260                 active = readl(port->s_active[0]) & 0xFFFFFFFE;
1261                 for (n = 1; n < port->dd->slot_groups; n++)
1262                         active |= readl(port->s_active[n]);
1263
1264                 if (!active)
1265                         break;
1266
1267                 msleep(20);
1268         } while (time_before(jiffies, to));
1269
1270         return active ? -EBUSY : 0;
1271 }
1272
1273 /*
1274  * Execute an internal command and wait for the completion.
1275  *
1276  * @port    Pointer to the port data structure.
1277  * @fis     Pointer to the FIS that describes the command.
1278  * @fis_len  Length in WORDS of the FIS.
1279  * @buffer  DMA accessible for command data.
1280  * @buf_len  Length, in bytes, of the data buffer.
1281  * @opts    Command header options, excluding the FIS length
1282  *             and the number of PRD entries.
1283  * @timeout Time in ms to wait for the command to complete.
1284  *
1285  * return value
1286  *      0        Command completed successfully.
1287  *      -EFAULT  The buffer address is not correctly aligned.
1288  *      -EBUSY   Internal command or other IO in progress.
1289  *      -EAGAIN  Time out waiting for command to complete.
1290  */
1291 static int mtip_exec_internal_command(struct mtip_port *port,
1292                                         struct host_to_dev_fis *fis,
1293                                         int fis_len,
1294                                         dma_addr_t buffer,
1295                                         int buf_len,
1296                                         u32 opts,
1297                                         gfp_t atomic,
1298                                         unsigned long timeout)
1299 {
1300         struct mtip_cmd_sg *command_sg;
1301         DECLARE_COMPLETION_ONSTACK(wait);
1302         int rv = 0, ready2go = 1;
1303         struct mtip_cmd *int_cmd = &port->commands[MTIP_TAG_INTERNAL];
1304         unsigned long to;
1305         struct driver_data *dd = port->dd;
1306
1307         /* Make sure the buffer is 8 byte aligned. This is asic specific. */
1308         if (buffer & 0x00000007) {
1309                 dev_err(&dd->pdev->dev, "SG buffer is not 8 byte aligned\n");
1310                 return -EFAULT;
1311         }
1312
1313         to = jiffies + msecs_to_jiffies(timeout);
1314         do {
1315                 ready2go = !test_and_set_bit(MTIP_TAG_INTERNAL,
1316                                                 port->allocated);
1317                 if (ready2go)
1318                         break;
1319                 mdelay(100);
1320         } while (time_before(jiffies, to));
1321         if (!ready2go) {
1322                 dev_warn(&dd->pdev->dev,
1323                         "Internal cmd active. new cmd [%02X]\n", fis->command);
1324                 return -EBUSY;
1325         }
1326         set_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1327         port->ic_pause_timer = 0;
1328
1329         clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1330         clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1331
1332         if (atomic == GFP_KERNEL) {
1333                 if (fis->command != ATA_CMD_STANDBYNOW1) {
1334                         /* wait for io to complete if non atomic */
1335                         if (mtip_quiesce_io(port, 5000) < 0) {
1336                                 dev_warn(&dd->pdev->dev,
1337                                         "Failed to quiesce IO\n");
1338                                 release_slot(port, MTIP_TAG_INTERNAL);
1339                                 clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1340                                 wake_up_interruptible(&port->svc_wait);
1341                                 return -EBUSY;
1342                         }
1343                 }
1344
1345                 /* Set the completion function and data for the command. */
1346                 int_cmd->comp_data = &wait;
1347                 int_cmd->comp_func = mtip_completion;
1348
1349         } else {
1350                 /* Clear completion - we're going to poll */
1351                 int_cmd->comp_data = NULL;
1352                 int_cmd->comp_func = mtip_null_completion;
1353         }
1354
1355         /* Copy the command to the command table */
1356         memcpy(int_cmd->command, fis, fis_len*4);
1357
1358         /* Populate the SG list */
1359         int_cmd->command_header->opts =
1360                  __force_bit2int cpu_to_le32(opts | fis_len);
1361         if (buf_len) {
1362                 command_sg = int_cmd->command + AHCI_CMD_TBL_HDR_SZ;
1363
1364                 command_sg->info =
1365                         __force_bit2int cpu_to_le32((buf_len-1) & 0x3FFFFF);
1366                 command_sg->dba =
1367                         __force_bit2int cpu_to_le32(buffer & 0xFFFFFFFF);
1368                 command_sg->dba_upper =
1369                         __force_bit2int cpu_to_le32((buffer >> 16) >> 16);
1370
1371                 int_cmd->command_header->opts |=
1372                         __force_bit2int cpu_to_le32((1 << 16));
1373         }
1374
1375         /* Populate the command header */
1376         int_cmd->command_header->byte_count = 0;
1377
1378         /* Issue the command to the hardware */
1379         mtip_issue_non_ncq_command(port, MTIP_TAG_INTERNAL);
1380
1381         if (atomic == GFP_KERNEL) {
1382                 /* Wait for the command to complete or timeout. */
1383                 if (wait_for_completion_interruptible_timeout(
1384                                 &wait,
1385                                 msecs_to_jiffies(timeout)) <= 0) {
1386                         if (rv == -ERESTARTSYS) { /* interrupted */
1387                                 dev_err(&dd->pdev->dev,
1388                                         "Internal command [%02X] was interrupted after %lu ms\n",
1389                                         fis->command, timeout);
1390                                 rv = -EINTR;
1391                                 goto exec_ic_exit;
1392                         } else if (rv == 0) /* timeout */
1393                                 dev_err(&dd->pdev->dev,
1394                                         "Internal command did not complete [%02X] within timeout of  %lu ms\n",
1395                                         fis->command, timeout);
1396                         else
1397                                 dev_err(&dd->pdev->dev,
1398                                         "Internal command [%02X] wait returned code [%d] after %lu ms - unhandled\n",
1399                                         fis->command, rv, timeout);
1400
1401                         if (mtip_check_surprise_removal(dd->pdev) ||
1402                                 test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1403                                                 &dd->dd_flag)) {
1404                                 dev_err(&dd->pdev->dev,
1405                                         "Internal command [%02X] wait returned due to SR\n",
1406                                         fis->command);
1407                                 rv = -ENXIO;
1408                                 goto exec_ic_exit;
1409                         }
1410                         mtip_device_reset(dd); /* recover from timeout issue */
1411                         rv = -EAGAIN;
1412                         goto exec_ic_exit;
1413                 }
1414         } else {
1415                 u32 hba_stat, port_stat;
1416
1417                 /* Spin for <timeout> checking if command still outstanding */
1418                 timeout = jiffies + msecs_to_jiffies(timeout);
1419                 while ((readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1420                                 & (1 << MTIP_TAG_INTERNAL))
1421                                 && time_before(jiffies, timeout)) {
1422                         if (mtip_check_surprise_removal(dd->pdev)) {
1423                                 rv = -ENXIO;
1424                                 goto exec_ic_exit;
1425                         }
1426                         if ((fis->command != ATA_CMD_STANDBYNOW1) &&
1427                                 test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1428                                                 &dd->dd_flag)) {
1429                                 rv = -ENXIO;
1430                                 goto exec_ic_exit;
1431                         }
1432                         port_stat = readl(port->mmio + PORT_IRQ_STAT);
1433                         if (!port_stat)
1434                                 continue;
1435
1436                         if (port_stat & PORT_IRQ_ERR) {
1437                                 dev_err(&dd->pdev->dev,
1438                                         "Internal command [%02X] failed\n",
1439                                         fis->command);
1440                                 mtip_device_reset(dd);
1441                                 rv = -EIO;
1442                                 goto exec_ic_exit;
1443                         } else {
1444                                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
1445                                 hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
1446                                 if (hba_stat)
1447                                         writel(hba_stat,
1448                                                 dd->mmio + HOST_IRQ_STAT);
1449                         }
1450                         break;
1451                 }
1452         }
1453
1454         if (readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1455                         & (1 << MTIP_TAG_INTERNAL)) {
1456                 rv = -ENXIO;
1457                 if (!test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
1458                         mtip_device_reset(dd);
1459                         rv = -EAGAIN;
1460                 }
1461         }
1462 exec_ic_exit:
1463         /* Clear the allocated and active bits for the internal command. */
1464         atomic_set(&int_cmd->active, 0);
1465         release_slot(port, MTIP_TAG_INTERNAL);
1466         if (rv >= 0 && mtip_pause_ncq(port, fis)) {
1467                 /* NCQ paused */
1468                 return rv;
1469         }
1470         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1471         wake_up_interruptible(&port->svc_wait);
1472
1473         return rv;
1474 }
1475
1476 /*
1477  * Byte-swap ATA ID strings.
1478  *
1479  * ATA identify data contains strings in byte-swapped 16-bit words.
1480  * They must be swapped (on all architectures) to be usable as C strings.
1481  * This function swaps bytes in-place.
1482  *
1483  * @buf The buffer location of the string
1484  * @len The number of bytes to swap
1485  *
1486  * return value
1487  *      None
1488  */
1489 static inline void ata_swap_string(u16 *buf, unsigned int len)
1490 {
1491         int i;
1492         for (i = 0; i < (len/2); i++)
1493                 be16_to_cpus(&buf[i]);
1494 }
1495
1496 /*
1497  * Request the device identity information.
1498  *
1499  * If a user space buffer is not specified, i.e. is NULL, the
1500  * identify information is still read from the drive and placed
1501  * into the identify data buffer (@e port->identify) in the
1502  * port data structure.
1503  * When the identify buffer contains valid identify information @e
1504  * port->identify_valid is non-zero.
1505  *
1506  * @port         Pointer to the port structure.
1507  * @user_buffer  A user space buffer where the identify data should be
1508  *                    copied.
1509  *
1510  * return value
1511  *      0       Command completed successfully.
1512  *      -EFAULT An error occurred while coping data to the user buffer.
1513  *      -1      Command failed.
1514  */
1515 static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
1516 {
1517         int rv = 0;
1518         struct host_to_dev_fis fis;
1519
1520         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1521                 return -EFAULT;
1522
1523         /* Build the FIS. */
1524         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1525         fis.type        = 0x27;
1526         fis.opts        = 1 << 7;
1527         fis.command     = ATA_CMD_ID_ATA;
1528
1529         /* Set the identify information as invalid. */
1530         port->identify_valid = 0;
1531
1532         /* Clear the identify information. */
1533         memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);
1534
1535         /* Execute the command. */
1536         if (mtip_exec_internal_command(port,
1537                                 &fis,
1538                                 5,
1539                                 port->identify_dma,
1540                                 sizeof(u16) * ATA_ID_WORDS,
1541                                 0,
1542                                 GFP_KERNEL,
1543                                 MTIP_INTERNAL_COMMAND_TIMEOUT_MS)
1544                                 < 0) {
1545                 rv = -1;
1546                 goto out;
1547         }
1548
1549         /*
1550          * Perform any necessary byte-swapping.  Yes, the kernel does in fact
1551          * perform field-sensitive swapping on the string fields.
1552          * See the kernel use of ata_id_string() for proof of this.
1553          */
1554 #ifdef __LITTLE_ENDIAN
1555         ata_swap_string(port->identify + 27, 40);  /* model string*/
1556         ata_swap_string(port->identify + 23, 8);   /* firmware string*/
1557         ata_swap_string(port->identify + 10, 20);  /* serial# string*/
1558 #else
1559         {
1560                 int i;
1561                 for (i = 0; i < ATA_ID_WORDS; i++)
1562                         port->identify[i] = le16_to_cpu(port->identify[i]);
1563         }
1564 #endif
1565
1566 #ifdef MTIP_TRIM /* Disabling TRIM support temporarily */
1567         /* Demux ID.DRAT & ID.RZAT to determine trim support */
1568         if (port->identify[69] & (1 << 14) && port->identify[69] & (1 << 5))
1569                 port->dd->trim_supp = true;
1570         else
1571 #endif
1572                 port->dd->trim_supp = false;
1573
1574         /* Set the identify buffer as valid. */
1575         port->identify_valid = 1;
1576
1577         if (user_buffer) {
1578                 if (copy_to_user(
1579                         user_buffer,
1580                         port->identify,
1581                         ATA_ID_WORDS * sizeof(u16))) {
1582                         rv = -EFAULT;
1583                         goto out;
1584                 }
1585         }
1586
1587 out:
1588         return rv;
1589 }
1590
1591 /*
1592  * Issue a standby immediate command to the device.
1593  *
1594  * @port Pointer to the port structure.
1595  *
1596  * return value
1597  *      0       Command was executed successfully.
1598  *      -1      An error occurred while executing the command.
1599  */
1600 static int mtip_standby_immediate(struct mtip_port *port)
1601 {
1602         int rv;
1603         struct host_to_dev_fis  fis;
1604         unsigned long start;
1605
1606         /* Build the FIS. */
1607         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1608         fis.type        = 0x27;
1609         fis.opts        = 1 << 7;
1610         fis.command     = ATA_CMD_STANDBYNOW1;
1611
1612         start = jiffies;
1613         rv = mtip_exec_internal_command(port,
1614                                         &fis,
1615                                         5,
1616                                         0,
1617                                         0,
1618                                         0,
1619                                         GFP_ATOMIC,
1620                                         15000);
1621         dbg_printk(MTIP_DRV_NAME "Time taken to complete standby cmd: %d ms\n",
1622                         jiffies_to_msecs(jiffies - start));
1623         if (rv)
1624                 dev_warn(&port->dd->pdev->dev,
1625                         "STANDBY IMMEDIATE command failed.\n");
1626
1627         return rv;
1628 }
1629
1630 /*
1631  * Issue a READ LOG EXT command to the device.
1632  *
1633  * @port        pointer to the port structure.
1634  * @page        page number to fetch
1635  * @buffer      pointer to buffer
1636  * @buffer_dma  dma address corresponding to @buffer
1637  * @sectors     page length to fetch, in sectors
1638  *
1639  * return value
1640  *      @rv     return value from mtip_exec_internal_command()
1641  */
1642 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
1643                                 dma_addr_t buffer_dma, unsigned int sectors)
1644 {
1645         struct host_to_dev_fis fis;
1646
1647         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1648         fis.type        = 0x27;
1649         fis.opts        = 1 << 7;
1650         fis.command     = ATA_CMD_READ_LOG_EXT;
1651         fis.sect_count  = sectors & 0xFF;
1652         fis.sect_cnt_ex = (sectors >> 8) & 0xFF;
1653         fis.lba_low     = page;
1654         fis.lba_mid     = 0;
1655         fis.device      = ATA_DEVICE_OBS;
1656
1657         memset(buffer, 0, sectors * ATA_SECT_SIZE);
1658
1659         return mtip_exec_internal_command(port,
1660                                         &fis,
1661                                         5,
1662                                         buffer_dma,
1663                                         sectors * ATA_SECT_SIZE,
1664                                         0,
1665                                         GFP_ATOMIC,
1666                                         MTIP_INTERNAL_COMMAND_TIMEOUT_MS);
1667 }
1668
1669 /*
1670  * Issue a SMART READ DATA command to the device.
1671  *
1672  * @port        pointer to the port structure.
1673  * @buffer      pointer to buffer
1674  * @buffer_dma  dma address corresponding to @buffer
1675  *
1676  * return value
1677  *      @rv     return value from mtip_exec_internal_command()
1678  */
1679 static int mtip_get_smart_data(struct mtip_port *port, u8 *buffer,
1680                                         dma_addr_t buffer_dma)
1681 {
1682         struct host_to_dev_fis fis;
1683
1684         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1685         fis.type        = 0x27;
1686         fis.opts        = 1 << 7;
1687         fis.command     = ATA_CMD_SMART;
1688         fis.features    = 0xD0;
1689         fis.sect_count  = 1;
1690         fis.lba_mid     = 0x4F;
1691         fis.lba_hi      = 0xC2;
1692         fis.device      = ATA_DEVICE_OBS;
1693
1694         return mtip_exec_internal_command(port,
1695                                         &fis,
1696                                         5,
1697                                         buffer_dma,
1698                                         ATA_SECT_SIZE,
1699                                         0,
1700                                         GFP_ATOMIC,
1701                                         15000);
1702 }
1703
1704 /*
1705  * Get the value of a smart attribute
1706  *
1707  * @port        pointer to the port structure
1708  * @id          attribute number
1709  * @attrib      pointer to return attrib information corresponding to @id
1710  *
1711  * return value
1712  *      -EINVAL NULL buffer passed or unsupported attribute @id.
1713  *      -EPERM  Identify data not valid, SMART not supported or not enabled
1714  */
1715 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
1716                                                 struct smart_attr *attrib)
1717 {
1718         int rv, i;
1719         struct smart_attr *pattr;
1720
1721         if (!attrib)
1722                 return -EINVAL;
1723
1724         if (!port->identify_valid) {
1725                 dev_warn(&port->dd->pdev->dev, "IDENTIFY DATA not valid\n");
1726                 return -EPERM;
1727         }
1728         if (!(port->identify[82] & 0x1)) {
1729                 dev_warn(&port->dd->pdev->dev, "SMART not supported\n");
1730                 return -EPERM;
1731         }
1732         if (!(port->identify[85] & 0x1)) {
1733                 dev_warn(&port->dd->pdev->dev, "SMART not enabled\n");
1734                 return -EPERM;
1735         }
1736
1737         memset(port->smart_buf, 0, ATA_SECT_SIZE);
1738         rv = mtip_get_smart_data(port, port->smart_buf, port->smart_buf_dma);
1739         if (rv) {
1740                 dev_warn(&port->dd->pdev->dev, "Failed to ge SMART data\n");
1741                 return rv;
1742         }
1743
1744         pattr = (struct smart_attr *)(port->smart_buf + 2);
1745         for (i = 0; i < 29; i++, pattr++)
1746                 if (pattr->attr_id == id) {
1747                         memcpy(attrib, pattr, sizeof(struct smart_attr));
1748                         break;
1749                 }
1750
1751         if (i == 29) {
1752                 dev_warn(&port->dd->pdev->dev,
1753                         "Query for invalid SMART attribute ID\n");
1754                 rv = -EINVAL;
1755         }
1756
1757         return rv;
1758 }
1759
1760 /*
1761  * Trim unused sectors
1762  *
1763  * @dd          pointer to driver_data structure
1764  * @lba         starting lba
1765  * @len         # of 512b sectors to trim
1766  *
1767  * return value
1768  *      -ENOMEM         Out of dma memory
1769  *      -EINVAL         Invalid parameters passed in, trim not supported
1770  *      -EIO            Error submitting trim request to hw
1771  */
1772 static int mtip_send_trim(struct driver_data *dd, unsigned int lba,
1773                                 unsigned int len)
1774 {
1775         int i, rv = 0;
1776         u64 tlba, tlen, sect_left;
1777         struct mtip_trim_entry *buf;
1778         dma_addr_t dma_addr;
1779         struct host_to_dev_fis fis;
1780
1781         if (!len || dd->trim_supp == false)
1782                 return -EINVAL;
1783
1784         /* Trim request too big */
1785         WARN_ON(len > (MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES));
1786
1787         /* Trim request not aligned on 4k boundary */
1788         WARN_ON(len % 8 != 0);
1789
1790         /* Warn if vu_trim structure is too big */
1791         WARN_ON(sizeof(struct mtip_trim) > ATA_SECT_SIZE);
1792
1793         /* Allocate a DMA buffer for the trim structure */
1794         buf = dmam_alloc_coherent(&dd->pdev->dev, ATA_SECT_SIZE, &dma_addr,
1795                                                                 GFP_KERNEL);
1796         if (!buf)
1797                 return -ENOMEM;
1798         memset(buf, 0, ATA_SECT_SIZE);
1799
1800         for (i = 0, sect_left = len, tlba = lba;
1801                         i < MTIP_MAX_TRIM_ENTRIES && sect_left;
1802                         i++) {
1803                 tlen = (sect_left >= MTIP_MAX_TRIM_ENTRY_LEN ?
1804                                         MTIP_MAX_TRIM_ENTRY_LEN :
1805                                         sect_left);
1806                 buf[i].lba = __force_bit2int cpu_to_le32(tlba);
1807                 buf[i].range = __force_bit2int cpu_to_le16(tlen);
1808                 tlba += tlen;
1809                 sect_left -= tlen;
1810         }
1811         WARN_ON(sect_left != 0);
1812
1813         /* Build the fis */
1814         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1815         fis.type       = 0x27;
1816         fis.opts       = 1 << 7;
1817         fis.command    = 0xfb;
1818         fis.features   = 0x60;
1819         fis.sect_count = 1;
1820         fis.device     = ATA_DEVICE_OBS;
1821
1822         if (mtip_exec_internal_command(dd->port,
1823                                         &fis,
1824                                         5,
1825                                         dma_addr,
1826                                         ATA_SECT_SIZE,
1827                                         0,
1828                                         GFP_KERNEL,
1829                                         MTIP_TRIM_TIMEOUT_MS) < 0)
1830                 rv = -EIO;
1831
1832         dmam_free_coherent(&dd->pdev->dev, ATA_SECT_SIZE, buf, dma_addr);
1833         return rv;
1834 }
1835
1836 /*
1837  * Get the drive capacity.
1838  *
1839  * @dd      Pointer to the device data structure.
1840  * @sectors Pointer to the variable that will receive the sector count.
1841  *
1842  * return value
1843  *      1 Capacity was returned successfully.
1844  *      0 The identify information is invalid.
1845  */
1846 static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
1847 {
1848         struct mtip_port *port = dd->port;
1849         u64 total, raw0, raw1, raw2, raw3;
1850         raw0 = port->identify[100];
1851         raw1 = port->identify[101];
1852         raw2 = port->identify[102];
1853         raw3 = port->identify[103];
1854         total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
1855         *sectors = total;
1856         return (bool) !!port->identify_valid;
1857 }
1858
1859 /*
1860  * Display the identify command data.
1861  *
1862  * @port Pointer to the port data structure.
1863  *
1864  * return value
1865  *      None
1866  */
1867 static void mtip_dump_identify(struct mtip_port *port)
1868 {
1869         sector_t sectors;
1870         unsigned short revid;
1871         char cbuf[42];
1872
1873         if (!port->identify_valid)
1874                 return;
1875
1876         strlcpy(cbuf, (char *)(port->identify+10), 21);
1877         dev_info(&port->dd->pdev->dev,
1878                 "Serial No.: %s\n", cbuf);
1879
1880         strlcpy(cbuf, (char *)(port->identify+23), 9);
1881         dev_info(&port->dd->pdev->dev,
1882                 "Firmware Ver.: %s\n", cbuf);
1883
1884         strlcpy(cbuf, (char *)(port->identify+27), 41);
1885         dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);
1886
1887         if (mtip_hw_get_capacity(port->dd, &sectors))
1888                 dev_info(&port->dd->pdev->dev,
1889                         "Capacity: %llu sectors (%llu MB)\n",
1890                          (u64)sectors,
1891                          ((u64)sectors) * ATA_SECT_SIZE >> 20);
1892
1893         pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
1894         switch (revid & 0xFF) {
1895         case 0x1:
1896                 strlcpy(cbuf, "A0", 3);
1897                 break;
1898         case 0x3:
1899                 strlcpy(cbuf, "A2", 3);
1900                 break;
1901         default:
1902                 strlcpy(cbuf, "?", 2);
1903                 break;
1904         }
1905         dev_info(&port->dd->pdev->dev,
1906                 "Card Type: %s\n", cbuf);
1907 }
1908
1909 /*
1910  * Map the commands scatter list into the command table.
1911  *
1912  * @command Pointer to the command.
1913  * @nents Number of scatter list entries.
1914  *
1915  * return value
1916  *      None
1917  */
1918 static inline void fill_command_sg(struct driver_data *dd,
1919                                 struct mtip_cmd *command,
1920                                 int nents)
1921 {
1922         int n;
1923         unsigned int dma_len;
1924         struct mtip_cmd_sg *command_sg;
1925         struct scatterlist *sg = command->sg;
1926
1927         command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
1928
1929         for (n = 0; n < nents; n++) {
1930                 dma_len = sg_dma_len(sg);
1931                 if (dma_len > 0x400000)
1932                         dev_err(&dd->pdev->dev,
1933                                 "DMA segment length truncated\n");
1934                 command_sg->info = __force_bit2int
1935                         cpu_to_le32((dma_len-1) & 0x3FFFFF);
1936                 command_sg->dba = __force_bit2int
1937                         cpu_to_le32(sg_dma_address(sg));
1938                 command_sg->dba_upper = __force_bit2int
1939                         cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
1940                 command_sg++;
1941                 sg++;
1942         }
1943 }
1944
1945 /*
1946  * @brief Execute a drive command.
1947  *
1948  * return value 0 The command completed successfully.
1949  * return value -1 An error occurred while executing the command.
1950  */
1951 static int exec_drive_task(struct mtip_port *port, u8 *command)
1952 {
1953         struct host_to_dev_fis  fis;
1954         struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
1955
1956         /* Build the FIS. */
1957         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1958         fis.type        = 0x27;
1959         fis.opts        = 1 << 7;
1960         fis.command     = command[0];
1961         fis.features    = command[1];
1962         fis.sect_count  = command[2];
1963         fis.sector      = command[3];
1964         fis.cyl_low     = command[4];
1965         fis.cyl_hi      = command[5];
1966         fis.device      = command[6] & ~0x10; /* Clear the dev bit*/
1967
1968         dbg_printk(MTIP_DRV_NAME " %s: User Command: cmd %x, feat %x, nsect %x, sect %x, lcyl %x, hcyl %x, sel %x\n",
1969                 __func__,
1970                 command[0],
1971                 command[1],
1972                 command[2],
1973                 command[3],
1974                 command[4],
1975                 command[5],
1976                 command[6]);
1977
1978         /* Execute the command. */
1979         if (mtip_exec_internal_command(port,
1980                                  &fis,
1981                                  5,
1982                                  0,
1983                                  0,
1984                                  0,
1985                                  GFP_KERNEL,
1986                                  MTIP_IOCTL_COMMAND_TIMEOUT_MS) < 0) {
1987                 return -1;
1988         }
1989
1990         command[0] = reply->command; /* Status*/
1991         command[1] = reply->features; /* Error*/
1992         command[4] = reply->cyl_low;
1993         command[5] = reply->cyl_hi;
1994
1995         dbg_printk(MTIP_DRV_NAME " %s: Completion Status: stat %x, err %x , cyl_lo %x cyl_hi %x\n",
1996                 __func__,
1997                 command[0],
1998                 command[1],
1999                 command[4],
2000                 command[5]);
2001
2002         return 0;
2003 }
2004
2005 /*
2006  * @brief Execute a drive command.
2007  *
2008  * @param port Pointer to the port data structure.
2009  * @param command Pointer to the user specified command parameters.
2010  * @param user_buffer Pointer to the user space buffer where read sector
2011  *                   data should be copied.
2012  *
2013  * return value 0 The command completed successfully.
2014  * return value -EFAULT An error occurred while copying the completion
2015  *                 data to the user space buffer.
2016  * return value -1 An error occurred while executing the command.
2017  */
2018 static int exec_drive_command(struct mtip_port *port, u8 *command,
2019                                 void __user *user_buffer)
2020 {
2021         struct host_to_dev_fis  fis;
2022         struct host_to_dev_fis *reply;
2023         u8 *buf = NULL;
2024         dma_addr_t dma_addr = 0;
2025         int rv = 0, xfer_sz = command[3];
2026
2027         if (xfer_sz) {
2028                 if (!user_buffer)
2029                         return -EFAULT;
2030
2031                 buf = dmam_alloc_coherent(&port->dd->pdev->dev,
2032                                 ATA_SECT_SIZE * xfer_sz,
2033                                 &dma_addr,
2034                                 GFP_KERNEL);
2035                 if (!buf) {
2036                         dev_err(&port->dd->pdev->dev,
2037                                 "Memory allocation failed (%d bytes)\n",
2038                                 ATA_SECT_SIZE * xfer_sz);
2039                         return -ENOMEM;
2040                 }
2041                 memset(buf, 0, ATA_SECT_SIZE * xfer_sz);
2042         }
2043
2044         /* Build the FIS. */
2045         memset(&fis, 0, sizeof(struct host_to_dev_fis));
2046         fis.type        = 0x27;
2047         fis.opts        = 1 << 7;
2048         fis.command     = command[0];
2049         fis.features    = command[2];
2050         fis.sect_count  = command[3];
2051         if (fis.command == ATA_CMD_SMART) {
2052                 fis.sector      = command[1];
2053                 fis.cyl_low     = 0x4F;
2054                 fis.cyl_hi      = 0xC2;
2055         }
2056
2057         if (xfer_sz)
2058                 reply = (port->rxfis + RX_FIS_PIO_SETUP);
2059         else
2060                 reply = (port->rxfis + RX_FIS_D2H_REG);
2061
2062         dbg_printk(MTIP_DRV_NAME
2063                 " %s: User Command: cmd %x, sect %x, "
2064                 "feat %x, sectcnt %x\n",
2065                 __func__,
2066                 command[0],
2067                 command[1],
2068                 command[2],
2069                 command[3]);
2070
2071         /* Execute the command. */
2072         if (mtip_exec_internal_command(port,
2073                                 &fis,
2074                                  5,
2075                                  (xfer_sz ? dma_addr : 0),
2076                                  (xfer_sz ? ATA_SECT_SIZE * xfer_sz : 0),
2077                                  0,
2078                                  GFP_KERNEL,
2079                                  MTIP_IOCTL_COMMAND_TIMEOUT_MS)
2080                                  < 0) {
2081                 rv = -EFAULT;
2082                 goto exit_drive_command;
2083         }
2084
2085         /* Collect the completion status. */
2086         command[0] = reply->command; /* Status*/
2087         command[1] = reply->features; /* Error*/
2088         command[2] = reply->sect_count;
2089
2090         dbg_printk(MTIP_DRV_NAME
2091                 " %s: Completion Status: stat %x, "
2092                 "err %x, nsect %x\n",
2093                 __func__,
2094                 command[0],
2095                 command[1],
2096                 command[2]);
2097
2098         if (xfer_sz) {
2099                 if (copy_to_user(user_buffer,
2100                                  buf,
2101                                  ATA_SECT_SIZE * command[3])) {
2102                         rv = -EFAULT;
2103                         goto exit_drive_command;
2104                 }
2105         }
2106 exit_drive_command:
2107         if (buf)
2108                 dmam_free_coherent(&port->dd->pdev->dev,
2109                                 ATA_SECT_SIZE * xfer_sz, buf, dma_addr);
2110         return rv;
2111 }
2112
2113 /*
2114  *  Indicates whether a command has a single sector payload.
2115  *
2116  *  @command passed to the device to perform the certain event.
2117  *  @features passed to the device to perform the certain event.
2118  *
2119  *  return value
2120  *      1       command is one that always has a single sector payload,
2121  *              regardless of the value in the Sector Count field.
2122  *      0       otherwise
2123  *
2124  */
2125 static unsigned int implicit_sector(unsigned char command,
2126                                     unsigned char features)
2127 {
2128         unsigned int rv = 0;
2129
2130         /* list of commands that have an implicit sector count of 1 */
2131         switch (command) {
2132         case ATA_CMD_SEC_SET_PASS:
2133         case ATA_CMD_SEC_UNLOCK:
2134         case ATA_CMD_SEC_ERASE_PREP:
2135         case ATA_CMD_SEC_ERASE_UNIT:
2136         case ATA_CMD_SEC_FREEZE_LOCK:
2137         case ATA_CMD_SEC_DISABLE_PASS:
2138         case ATA_CMD_PMP_READ:
2139         case ATA_CMD_PMP_WRITE:
2140                 rv = 1;
2141                 break;
2142         case ATA_CMD_SET_MAX:
2143                 if (features == ATA_SET_MAX_UNLOCK)
2144                         rv = 1;
2145                 break;
2146         case ATA_CMD_SMART:
2147                 if ((features == ATA_SMART_READ_VALUES) ||
2148                                 (features == ATA_SMART_READ_THRESHOLDS))
2149                         rv = 1;
2150                 break;
2151         case ATA_CMD_CONF_OVERLAY:
2152                 if ((features == ATA_DCO_IDENTIFY) ||
2153                                 (features == ATA_DCO_SET))
2154                         rv = 1;
2155                 break;
2156         }
2157         return rv;
2158 }
2159 static void mtip_set_timeout(struct driver_data *dd,
2160                                         struct host_to_dev_fis *fis,
2161                                         unsigned int *timeout, u8 erasemode)
2162 {
2163         switch (fis->command) {
2164         case ATA_CMD_DOWNLOAD_MICRO:
2165                 *timeout = 120000; /* 2 minutes */
2166                 break;
2167         case ATA_CMD_SEC_ERASE_UNIT:
2168         case 0xFC:
2169                 if (erasemode)
2170                         *timeout = ((*(dd->port->identify + 90) * 2) * 60000);
2171                 else
2172                         *timeout = ((*(dd->port->identify + 89) * 2) * 60000);
2173                 break;
2174         case ATA_CMD_STANDBYNOW1:
2175                 *timeout = 120000;  /* 2 minutes */
2176                 break;
2177         case 0xF7:
2178         case 0xFA:
2179                 *timeout = 60000;  /* 60 seconds */
2180                 break;
2181         case ATA_CMD_SMART:
2182                 *timeout = 15000;  /* 15 seconds */
2183                 break;
2184         default:
2185                 *timeout = MTIP_IOCTL_COMMAND_TIMEOUT_MS;
2186                 break;
2187         }
2188 }
2189
2190 /*
2191  * Executes a taskfile
2192  * See ide_taskfile_ioctl() for derivation
2193  */
2194 static int exec_drive_taskfile(struct driver_data *dd,
2195                                void __user *buf,
2196                                ide_task_request_t *req_task,
2197                                int outtotal)
2198 {
2199         struct host_to_dev_fis  fis;
2200         struct host_to_dev_fis *reply;
2201         u8 *outbuf = NULL;
2202         u8 *inbuf = NULL;
2203         dma_addr_t outbuf_dma = 0;
2204         dma_addr_t inbuf_dma = 0;
2205         dma_addr_t dma_buffer = 0;
2206         int err = 0;
2207         unsigned int taskin = 0;
2208         unsigned int taskout = 0;
2209         u8 nsect = 0;
2210         unsigned int timeout;
2211         unsigned int force_single_sector;
2212         unsigned int transfer_size;
2213         unsigned long task_file_data;
2214         int intotal = outtotal + req_task->out_size;
2215         int erasemode = 0;
2216
2217         taskout = req_task->out_size;
2218         taskin = req_task->in_size;
2219         /* 130560 = 512 * 0xFF*/
2220         if (taskin > 130560 || taskout > 130560) {
2221                 err = -EINVAL;
2222                 goto abort;
2223         }
2224
2225         if (taskout) {
2226                 outbuf = kzalloc(taskout, GFP_KERNEL);
2227                 if (outbuf == NULL) {
2228                         err = -ENOMEM;
2229                         goto abort;
2230                 }
2231                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
2232                         err = -EFAULT;
2233                         goto abort;
2234                 }
2235                 outbuf_dma = pci_map_single(dd->pdev,
2236                                          outbuf,
2237                                          taskout,
2238                                          DMA_TO_DEVICE);
2239                 if (outbuf_dma == 0) {
2240                         err = -ENOMEM;
2241                         goto abort;
2242                 }
2243                 dma_buffer = outbuf_dma;
2244         }
2245
2246         if (taskin) {
2247                 inbuf = kzalloc(taskin, GFP_KERNEL);
2248                 if (inbuf == NULL) {
2249                         err = -ENOMEM;
2250                         goto abort;
2251                 }
2252
2253                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
2254                         err = -EFAULT;
2255                         goto abort;
2256                 }
2257                 inbuf_dma = pci_map_single(dd->pdev,
2258                                          inbuf,
2259                                          taskin, DMA_FROM_DEVICE);
2260                 if (inbuf_dma == 0) {
2261                         err = -ENOMEM;
2262                         goto abort;
2263                 }
2264                 dma_buffer = inbuf_dma;
2265         }
2266
2267         /* only supports PIO and non-data commands from this ioctl. */
2268         switch (req_task->data_phase) {
2269         case TASKFILE_OUT:
2270                 nsect = taskout / ATA_SECT_SIZE;
2271                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
2272                 break;
2273         case TASKFILE_IN:
2274                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
2275                 break;
2276         case TASKFILE_NO_DATA:
2277                 reply = (dd->port->rxfis + RX_FIS_D2H_REG);
2278                 break;
2279         default:
2280                 err = -EINVAL;
2281                 goto abort;
2282         }
2283
2284         /* Build the FIS. */
2285         memset(&fis, 0, sizeof(struct host_to_dev_fis));
2286
2287         fis.type        = 0x27;
2288         fis.opts        = 1 << 7;
2289         fis.command     = req_task->io_ports[7];
2290         fis.features    = req_task->io_ports[1];
2291         fis.sect_count  = req_task->io_ports[2];
2292         fis.lba_low     = req_task->io_ports[3];
2293         fis.lba_mid     = req_task->io_ports[4];
2294         fis.lba_hi      = req_task->io_ports[5];
2295          /* Clear the dev bit*/
2296         fis.device      = req_task->io_ports[6] & ~0x10;
2297
2298         if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
2299                 req_task->in_flags.all  =
2300                         IDE_TASKFILE_STD_IN_FLAGS |
2301                         (IDE_HOB_STD_IN_FLAGS << 8);
2302                 fis.lba_low_ex          = req_task->hob_ports[3];
2303                 fis.lba_mid_ex          = req_task->hob_ports[4];
2304                 fis.lba_hi_ex           = req_task->hob_ports[5];
2305                 fis.features_ex         = req_task->hob_ports[1];
2306                 fis.sect_cnt_ex         = req_task->hob_ports[2];
2307
2308         } else {
2309                 req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
2310         }
2311
2312         force_single_sector = implicit_sector(fis.command, fis.features);
2313
2314         if ((taskin || taskout) && (!fis.sect_count)) {
2315                 if (nsect)
2316                         fis.sect_count = nsect;
2317                 else {
2318                         if (!force_single_sector) {
2319                                 dev_warn(&dd->pdev->dev,
2320                                         "data movement but "
2321                                         "sect_count is 0\n");
2322                                         err = -EINVAL;
2323                                         goto abort;
2324                         }
2325                 }
2326         }
2327
2328         dbg_printk(MTIP_DRV_NAME
2329                 " %s: cmd %x, feat %x, nsect %x,"
2330                 " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
2331                 " head/dev %x\n",
2332                 __func__,
2333                 fis.command,
2334                 fis.features,
2335                 fis.sect_count,
2336                 fis.lba_low,
2337                 fis.lba_mid,
2338                 fis.lba_hi,
2339                 fis.device);
2340
2341         /* check for erase mode support during secure erase.*/
2342         if ((fis.command == ATA_CMD_SEC_ERASE_UNIT) && outbuf &&
2343                                         (outbuf[0] & MTIP_SEC_ERASE_MODE)) {
2344                 erasemode = 1;
2345         }
2346
2347         mtip_set_timeout(dd, &fis, &timeout, erasemode);
2348
2349         /* Determine the correct transfer size.*/
2350         if (force_single_sector)
2351                 transfer_size = ATA_SECT_SIZE;
2352         else
2353                 transfer_size = ATA_SECT_SIZE * fis.sect_count;
2354
2355         /* Execute the command.*/
2356         if (mtip_exec_internal_command(dd->port,
2357                                  &fis,
2358                                  5,
2359                                  dma_buffer,
2360                                  transfer_size,
2361                                  0,
2362                                  GFP_KERNEL,
2363                                  timeout) < 0) {
2364                 err = -EIO;
2365                 goto abort;
2366         }
2367
2368         task_file_data = readl(dd->port->mmio+PORT_TFDATA);
2369
2370         if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
2371                 reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
2372                 req_task->io_ports[7] = reply->control;
2373         } else {
2374                 reply = dd->port->rxfis + RX_FIS_D2H_REG;
2375                 req_task->io_ports[7] = reply->command;
2376         }
2377
2378         /* reclaim the DMA buffers.*/
2379         if (inbuf_dma)
2380                 pci_unmap_single(dd->pdev, inbuf_dma,
2381                         taskin, DMA_FROM_DEVICE);
2382         if (outbuf_dma)
2383                 pci_unmap_single(dd->pdev, outbuf_dma,
2384                         taskout, DMA_TO_DEVICE);
2385         inbuf_dma  = 0;
2386         outbuf_dma = 0;
2387
2388         /* return the ATA registers to the caller.*/
2389         req_task->io_ports[1] = reply->features;
2390         req_task->io_ports[2] = reply->sect_count;
2391         req_task->io_ports[3] = reply->lba_low;
2392         req_task->io_ports[4] = reply->lba_mid;
2393         req_task->io_ports[5] = reply->lba_hi;
2394         req_task->io_ports[6] = reply->device;
2395
2396         if (req_task->out_flags.all & 1)  {
2397
2398                 req_task->hob_ports[3] = reply->lba_low_ex;
2399                 req_task->hob_ports[4] = reply->lba_mid_ex;
2400                 req_task->hob_ports[5] = reply->lba_hi_ex;
2401                 req_task->hob_ports[1] = reply->features_ex;
2402                 req_task->hob_ports[2] = reply->sect_cnt_ex;
2403         }
2404         dbg_printk(MTIP_DRV_NAME
2405                 " %s: Completion: stat %x,"
2406                 "err %x, sect_cnt %x, lbalo %x,"
2407                 "lbamid %x, lbahi %x, dev %x\n",
2408                 __func__,
2409                 req_task->io_ports[7],
2410                 req_task->io_ports[1],
2411                 req_task->io_ports[2],
2412                 req_task->io_ports[3],
2413                 req_task->io_ports[4],
2414                 req_task->io_ports[5],
2415                 req_task->io_ports[6]);
2416
2417         if (taskout) {
2418                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
2419                         err = -EFAULT;
2420                         goto abort;
2421                 }
2422         }
2423         if (taskin) {
2424                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
2425                         err = -EFAULT;
2426                         goto abort;
2427                 }
2428         }
2429 abort:
2430         if (inbuf_dma)
2431                 pci_unmap_single(dd->pdev, inbuf_dma,
2432                                         taskin, DMA_FROM_DEVICE);
2433         if (outbuf_dma)
2434                 pci_unmap_single(dd->pdev, outbuf_dma,
2435                                         taskout, DMA_TO_DEVICE);
2436         kfree(outbuf);
2437         kfree(inbuf);
2438
2439         return err;
2440 }
2441
2442 /*
2443  * Handle IOCTL calls from the Block Layer.
2444  *
2445  * This function is called by the Block Layer when it receives an IOCTL
2446  * command that it does not understand. If the IOCTL command is not supported
2447  * this function returns -ENOTTY.
2448  *
2449  * @dd  Pointer to the driver data structure.
2450  * @cmd IOCTL command passed from the Block Layer.
2451  * @arg IOCTL argument passed from the Block Layer.
2452  *
2453  * return value
2454  *      0       The IOCTL completed successfully.
2455  *      -ENOTTY The specified command is not supported.
2456  *      -EFAULT An error occurred copying data to a user space buffer.
2457  *      -EIO    An error occurred while executing the command.
2458  */
2459 static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
2460                          unsigned long arg)
2461 {
2462         switch (cmd) {
2463         case HDIO_GET_IDENTITY:
2464         {
2465                 if (copy_to_user((void __user *)arg, dd->port->identify,
2466                                                 sizeof(u16) * ATA_ID_WORDS))
2467                         return -EFAULT;
2468                 break;
2469         }
2470         case HDIO_DRIVE_CMD:
2471         {
2472                 u8 drive_command[4];
2473
2474                 /* Copy the user command info to our buffer. */
2475                 if (copy_from_user(drive_command,
2476                                          (void __user *) arg,
2477                                          sizeof(drive_command)))
2478                         return -EFAULT;
2479
2480                 /* Execute the drive command. */
2481                 if (exec_drive_command(dd->port,
2482                                          drive_command,
2483                                          (void __user *) (arg+4)))
2484                         return -EIO;
2485
2486                 /* Copy the status back to the users buffer. */
2487                 if (copy_to_user((void __user *) arg,
2488                                          drive_command,
2489                                          sizeof(drive_command)))
2490                         return -EFAULT;
2491
2492                 break;
2493         }
2494         case HDIO_DRIVE_TASK:
2495         {
2496                 u8 drive_command[7];
2497
2498                 /* Copy the user command info to our buffer. */
2499                 if (copy_from_user(drive_command,
2500                                          (void __user *) arg,
2501                                          sizeof(drive_command)))
2502                         return -EFAULT;
2503
2504                 /* Execute the drive command. */
2505                 if (exec_drive_task(dd->port, drive_command))
2506                         return -EIO;
2507
2508                 /* Copy the status back to the users buffer. */
2509                 if (copy_to_user((void __user *) arg,
2510                                          drive_command,
2511                                          sizeof(drive_command)))
2512                         return -EFAULT;
2513
2514                 break;
2515         }
2516         case HDIO_DRIVE_TASKFILE: {
2517                 ide_task_request_t req_task;
2518                 int ret, outtotal;
2519
2520                 if (copy_from_user(&req_task, (void __user *) arg,
2521                                         sizeof(req_task)))
2522                         return -EFAULT;
2523
2524                 outtotal = sizeof(req_task);
2525
2526                 ret = exec_drive_taskfile(dd, (void __user *) arg,
2527                                                 &req_task, outtotal);
2528
2529                 if (copy_to_user((void __user *) arg, &req_task,
2530                                                         sizeof(req_task)))
2531                         return -EFAULT;
2532
2533                 return ret;
2534         }
2535
2536         default:
2537                 return -EINVAL;
2538         }
2539         return 0;
2540 }
2541
2542 /*
2543  * Submit an IO to the hw
2544  *
2545  * This function is called by the block layer to issue an io
2546  * to the device. Upon completion, the callback function will
2547  * be called with the data parameter passed as the callback data.
2548  *
2549  * @dd       Pointer to the driver data structure.
2550  * @start    First sector to read.
2551  * @nsect    Number of sectors to read.
2552  * @nents    Number of entries in scatter list for the read command.
2553  * @tag      The tag of this read command.
2554  * @callback Pointer to the function that should be called
2555  *           when the read completes.
2556  * @data     Callback data passed to the callback function
2557  *           when the read completes.
2558  * @dir      Direction (read or write)
2559  *
2560  * return value
2561  *      None
2562  */
2563 static void mtip_hw_submit_io(struct driver_data *dd, sector_t sector,
2564                               int nsect, int nents, int tag, void *callback,
2565                               void *data, int dir, int unaligned)
2566 {
2567         struct host_to_dev_fis  *fis;
2568         struct mtip_port *port = dd->port;
2569         struct mtip_cmd *command = &port->commands[tag];
2570         int dma_dir = (dir == READ) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2571         u64 start = sector;
2572
2573         /* Map the scatter list for DMA access */
2574         nents = dma_map_sg(&dd->pdev->dev, command->sg, nents, dma_dir);
2575
2576         command->scatter_ents = nents;
2577
2578         command->unaligned = unaligned;
2579         /*
2580          * The number of retries for this command before it is
2581          * reported as a failure to the upper layers.
2582          */
2583         command->retries = MTIP_MAX_RETRIES;
2584
2585         /* Fill out fis */
2586         fis = command->command;
2587         fis->type        = 0x27;
2588         fis->opts        = 1 << 7;
2589         fis->command     =
2590                 (dir == READ ? ATA_CMD_FPDMA_READ : ATA_CMD_FPDMA_WRITE);
2591         fis->lba_low     = start & 0xFF;
2592         fis->lba_mid     = (start >> 8) & 0xFF;
2593         fis->lba_hi      = (start >> 16) & 0xFF;
2594         fis->lba_low_ex  = (start >> 24) & 0xFF;
2595         fis->lba_mid_ex  = (start >> 32) & 0xFF;
2596         fis->lba_hi_ex   = (start >> 40) & 0xFF;
2597         fis->device      = 1 << 6;
2598         fis->features    = nsect & 0xFF;
2599         fis->features_ex = (nsect >> 8) & 0xFF;
2600         fis->sect_count  = ((tag << 3) | (tag >> 5));
2601         fis->sect_cnt_ex = 0;
2602         fis->control     = 0;
2603         fis->res2        = 0;
2604         fis->res3        = 0;
2605         fill_command_sg(dd, command, nents);
2606
2607         if (unaligned)
2608                 fis->device |= 1 << 7;
2609
2610         /* Populate the command header */
2611         command->command_header->opts =
2612                         __force_bit2int cpu_to_le32(
2613                                 (nents << 16) | 5 | AHCI_CMD_PREFETCH);
2614         command->command_header->byte_count = 0;
2615
2616         /*
2617          * Set the completion function and data for the command
2618          * within this layer.
2619          */
2620         command->comp_data = dd;
2621         command->comp_func = mtip_async_complete;
2622         command->direction = dma_dir;
2623
2624         /*
2625          * Set the completion function and data for the command passed
2626          * from the upper layer.
2627          */
2628         command->async_data = data;
2629         command->async_callback = callback;
2630
2631         /*
2632          * To prevent this command from being issued
2633          * if an internal command is in progress or error handling is active.
2634          */
2635         if (port->flags & MTIP_PF_PAUSE_IO) {
2636                 set_bit(tag, port->cmds_to_issue);
2637                 set_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2638                 return;
2639         }
2640
2641         /* Issue the command to the hardware */
2642         mtip_issue_ncq_command(port, tag);
2643
2644         return;
2645 }
2646
2647 /*
2648  * Release a command slot.
2649  *
2650  * @dd  Pointer to the driver data structure.
2651  * @tag Slot tag
2652  *
2653  * return value
2654  *      None
2655  */
2656 static void mtip_hw_release_scatterlist(struct driver_data *dd, int tag,
2657                                                                 int unaligned)
2658 {
2659         struct semaphore *sem = unaligned ? &dd->port->cmd_slot_unal :
2660                                                         &dd->port->cmd_slot;
2661         release_slot(dd->port, tag);
2662         up(sem);
2663 }
2664
2665 /*
2666  * Obtain a command slot and return its associated scatter list.
2667  *
2668  * @dd  Pointer to the driver data structure.
2669  * @tag Pointer to an int that will receive the allocated command
2670  *            slot tag.
2671  *
2672  * return value
2673  *      Pointer to the scatter list for the allocated command slot
2674  *      or NULL if no command slots are available.
2675  */
2676 static struct scatterlist *mtip_hw_get_scatterlist(struct driver_data *dd,
2677                                                    int *tag, int unaligned)
2678 {
2679         struct semaphore *sem = unaligned ? &dd->port->cmd_slot_unal :
2680                                                         &dd->port->cmd_slot;
2681
2682         /*
2683          * It is possible that, even with this semaphore, a thread
2684          * may think that no command slots are available. Therefore, we
2685          * need to make an attempt to get_slot().
2686          */
2687         down(sem);
2688         *tag = get_slot(dd->port);
2689
2690         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
2691                 up(sem);
2692                 return NULL;
2693         }
2694         if (unlikely(*tag < 0)) {
2695                 up(sem);
2696                 return NULL;
2697         }
2698
2699         return dd->port->commands[*tag].sg;
2700 }
2701
2702 /*
2703  * Sysfs status dump.
2704  *
2705  * @dev  Pointer to the device structure, passed by the kernrel.
2706  * @attr Pointer to the device_attribute structure passed by the kernel.
2707  * @buf  Pointer to the char buffer that will receive the stats info.
2708  *
2709  * return value
2710  *      The size, in bytes, of the data copied into buf.
2711  */
2712 static ssize_t mtip_hw_show_status(struct device *dev,
2713                                 struct device_attribute *attr,
2714                                 char *buf)
2715 {
2716         struct driver_data *dd = dev_to_disk(dev)->private_data;
2717         int size = 0;
2718
2719         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
2720                 size += sprintf(buf, "%s", "thermal_shutdown\n");
2721         else if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag))
2722                 size += sprintf(buf, "%s", "write_protect\n");
2723         else
2724                 size += sprintf(buf, "%s", "online\n");
2725
2726         return size;
2727 }
2728
2729 static DEVICE_ATTR(status, S_IRUGO, mtip_hw_show_status, NULL);
2730
2731 /* debugsfs entries */
2732
2733 static ssize_t show_device_status(struct device_driver *drv, char *buf)
2734 {
2735         int size = 0;
2736         struct driver_data *dd, *tmp;
2737         unsigned long flags;
2738         char id_buf[42];
2739         u16 status = 0;
2740
2741         spin_lock_irqsave(&dev_lock, flags);
2742         size += sprintf(&buf[size], "Devices Present:\n");
2743         list_for_each_entry_safe(dd, tmp, &online_list, online_list) {
2744                 if (dd->pdev) {
2745                         if (dd->port &&
2746                             dd->port->identify &&
2747                             dd->port->identify_valid) {
2748                                 strlcpy(id_buf,
2749                                         (char *) (dd->port->identify + 10), 21);
2750                                 status = *(dd->port->identify + 141);
2751                         } else {
2752                                 memset(id_buf, 0, 42);
2753                                 status = 0;
2754                         }
2755
2756                         if (dd->port &&
2757                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2758                                 size += sprintf(&buf[size],
2759                                         " device %s %s (ftl rebuild %d %%)\n",
2760                                         dev_name(&dd->pdev->dev),
2761                                         id_buf,
2762                                         status);
2763                         } else {
2764                                 size += sprintf(&buf[size],
2765                                         " device %s %s\n",
2766                                         dev_name(&dd->pdev->dev),
2767                                         id_buf);
2768                         }
2769                 }
2770         }
2771
2772         size += sprintf(&buf[size], "Devices Being Removed:\n");
2773         list_for_each_entry_safe(dd, tmp, &removing_list, remove_list) {
2774                 if (dd->pdev) {
2775                         if (dd->port &&
2776                             dd->port->identify &&
2777                             dd->port->identify_valid) {
2778                                 strlcpy(id_buf,
2779                                         (char *) (dd->port->identify+10), 21);
2780                                 status = *(dd->port->identify + 141);
2781                         } else {
2782                                 memset(id_buf, 0, 42);
2783                                 status = 0;
2784                         }
2785
2786                         if (dd->port &&
2787                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2788                                 size += sprintf(&buf[size],
2789                                         " device %s %s (ftl rebuild %d %%)\n",
2790                                         dev_name(&dd->pdev->dev),
2791                                         id_buf,
2792                                         status);
2793                         } else {
2794                                 size += sprintf(&buf[size],
2795                                         " device %s %s\n",
2796                                         dev_name(&dd->pdev->dev),
2797                                         id_buf);
2798                         }
2799                 }
2800         }
2801         spin_unlock_irqrestore(&dev_lock, flags);
2802
2803         return size;
2804 }
2805
2806 static ssize_t mtip_hw_read_device_status(struct file *f, char __user *ubuf,
2807                                                 size_t len, loff_t *offset)
2808 {
2809         int size = *offset;
2810         char buf[MTIP_DFS_MAX_BUF_SIZE];
2811
2812         if (!len || *offset)
2813                 return 0;
2814
2815         size += show_device_status(NULL, buf);
2816
2817         *offset = size <= len ? size : len;
2818         size = copy_to_user(ubuf, buf, *offset);
2819         if (size)
2820                 return -EFAULT;
2821
2822         return *offset;
2823 }
2824
2825 static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
2826                                   size_t len, loff_t *offset)
2827 {
2828         struct driver_data *dd =  (struct driver_data *)f->private_data;
2829         char buf[MTIP_DFS_MAX_BUF_SIZE];
2830         u32 group_allocated;
2831         int size = *offset;
2832         int n;
2833
2834         if (!len || size)
2835                 return 0;
2836
2837         size += sprintf(&buf[size], "H/ S ACTive      : [ 0x");
2838
2839         for (n = dd->slot_groups-1; n >= 0; n--)
2840                 size += sprintf(&buf[size], "%08X ",
2841                                          readl(dd->port->s_active[n]));
2842
2843         size += sprintf(&buf[size], "]\n");
2844         size += sprintf(&buf[size], "H/ Command Issue : [ 0x");
2845
2846         for (n = dd->slot_groups-1; n >= 0; n--)
2847                 size += sprintf(&buf[size], "%08X ",
2848                                         readl(dd->port->cmd_issue[n]));
2849
2850         size += sprintf(&buf[size], "]\n");
2851         size += sprintf(&buf[size], "H/ Completed     : [ 0x");
2852
2853         for (n = dd->slot_groups-1; n >= 0; n--)
2854                 size += sprintf(&buf[size], "%08X ",
2855                                 readl(dd->port->completed[n]));
2856
2857         size += sprintf(&buf[size], "]\n");
2858         size += sprintf(&buf[size], "H/ PORT IRQ STAT : [ 0x%08X ]\n",
2859                                 readl(dd->port->mmio + PORT_IRQ_STAT));
2860         size += sprintf(&buf[size], "H/ HOST IRQ STAT : [ 0x%08X ]\n",
2861                                 readl(dd->mmio + HOST_IRQ_STAT));
2862         size += sprintf(&buf[size], "\n");
2863
2864         size += sprintf(&buf[size], "L/ Allocated     : [ 0x");
2865
2866         for (n = dd->slot_groups-1; n >= 0; n--) {
2867                 if (sizeof(long) > sizeof(u32))
2868                         group_allocated =
2869                                 dd->port->allocated[n/2] >> (32*(n&1));
2870                 else
2871                         group_allocated = dd->port->allocated[n];
2872                 size += sprintf(&buf[size], "%08X ", group_allocated);
2873         }
2874         size += sprintf(&buf[size], "]\n");
2875
2876         size += sprintf(&buf[size], "L/ Commands in Q : [ 0x");
2877
2878         for (n = dd->slot_groups-1; n >= 0; n--) {
2879                 if (sizeof(long) > sizeof(u32))
2880                         group_allocated =
2881                                 dd->port->cmds_to_issue[n/2] >> (32*(n&1));
2882                 else
2883                         group_allocated = dd->port->cmds_to_issue[n];
2884                 size += sprintf(&buf[size], "%08X ", group_allocated);
2885         }
2886         size += sprintf(&buf[size], "]\n");
2887
2888         *offset = size <= len ? size : len;
2889         size = copy_to_user(ubuf, buf, *offset);
2890         if (size)
2891                 return -EFAULT;
2892
2893         return *offset;
2894 }
2895
2896 static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
2897                                   size_t len, loff_t *offset)
2898 {
2899         struct driver_data *dd =  (struct driver_data *)f->private_data;
2900         char buf[MTIP_DFS_MAX_BUF_SIZE];
2901         int size = *offset;
2902
2903         if (!len || size)
2904                 return 0;
2905
2906         size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
2907                                                         dd->port->flags);
2908         size += sprintf(&buf[size], "Flag-dd   : [ %08lX ]\n",
2909                                                         dd->dd_flag);
2910
2911         *offset = size <= len ? size : len;
2912         size = copy_to_user(ubuf, buf, *offset);
2913         if (size)
2914                 return -EFAULT;
2915
2916         return *offset;
2917 }
2918
2919 static const struct file_operations mtip_device_status_fops = {
2920         .owner  = THIS_MODULE,
2921         .open   = simple_open,
2922         .read   = mtip_hw_read_device_status,
2923         .llseek = no_llseek,
2924 };
2925
2926 static const struct file_operations mtip_regs_fops = {
2927         .owner  = THIS_MODULE,
2928         .open   = simple_open,
2929         .read   = mtip_hw_read_registers,
2930         .llseek = no_llseek,
2931 };
2932
2933 static const struct file_operations mtip_flags_fops = {
2934         .owner  = THIS_MODULE,
2935         .open   = simple_open,
2936         .read   = mtip_hw_read_flags,
2937         .llseek = no_llseek,
2938 };
2939
2940 /*
2941  * Create the sysfs related attributes.
2942  *
2943  * @dd   Pointer to the driver data structure.
2944  * @kobj Pointer to the kobj for the block device.
2945  *
2946  * return value
2947  *      0       Operation completed successfully.
2948  *      -EINVAL Invalid parameter.
2949  */
2950 static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
2951 {
2952         if (!kobj || !dd)
2953                 return -EINVAL;
2954
2955         if (sysfs_create_file(kobj, &dev_attr_status.attr))
2956                 dev_warn(&dd->pdev->dev,
2957                         "Error creating 'status' sysfs entry\n");
2958         return 0;
2959 }
2960
2961 /*
2962  * Remove the sysfs related attributes.
2963  *
2964  * @dd   Pointer to the driver data structure.
2965  * @kobj Pointer to the kobj for the block device.
2966  *
2967  * return value
2968  *      0       Operation completed successfully.
2969  *      -EINVAL Invalid parameter.
2970  */
2971 static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
2972 {
2973         if (!kobj || !dd)
2974                 return -EINVAL;
2975
2976         sysfs_remove_file(kobj, &dev_attr_status.attr);
2977
2978         return 0;
2979 }
2980
2981 static int mtip_hw_debugfs_init(struct driver_data *dd)
2982 {
2983         if (!dfs_parent)
2984                 return -1;
2985
2986         dd->dfs_node = debugfs_create_dir(dd->disk->disk_name, dfs_parent);
2987         if (IS_ERR_OR_NULL(dd->dfs_node)) {
2988                 dev_warn(&dd->pdev->dev,
2989                         "Error creating node %s under debugfs\n",
2990                                                 dd->disk->disk_name);
2991                 dd->dfs_node = NULL;
2992                 return -1;
2993         }
2994
2995         debugfs_create_file("flags", S_IRUGO, dd->dfs_node, dd,
2996                                                         &mtip_flags_fops);
2997         debugfs_create_file("registers", S_IRUGO, dd->dfs_node, dd,
2998                                                         &mtip_regs_fops);
2999
3000         return 0;
3001 }
3002
3003 static void mtip_hw_debugfs_exit(struct driver_data *dd)
3004 {
3005         if (dd->dfs_node)
3006                 debugfs_remove_recursive(dd->dfs_node);
3007 }
3008
3009
3010 /*
3011  * Perform any init/resume time hardware setup
3012  *
3013  * @dd Pointer to the driver data structure.
3014  *
3015  * return value
3016  *      None
3017  */
3018 static inline void hba_setup(struct driver_data *dd)
3019 {
3020         u32 hwdata;
3021         hwdata = readl(dd->mmio + HOST_HSORG);
3022
3023         /* interrupt bug workaround: use only 1 IS bit.*/
3024         writel(hwdata |
3025                 HSORG_DISABLE_SLOTGRP_INTR |
3026                 HSORG_DISABLE_SLOTGRP_PXIS,
3027                 dd->mmio + HOST_HSORG);
3028 }
3029
3030 static int mtip_device_unaligned_constrained(struct driver_data *dd)
3031 {
3032         return (dd->pdev->device == P420M_DEVICE_ID ? 1 : 0);
3033 }
3034
3035 /*
3036  * Detect the details of the product, and store anything needed
3037  * into the driver data structure.  This includes product type and
3038  * version and number of slot groups.
3039  *
3040  * @dd Pointer to the driver data structure.
3041  *
3042  * return value
3043  *      None
3044  */
3045 static void mtip_detect_product(struct driver_data *dd)
3046 {
3047         u32 hwdata;
3048         unsigned int rev, slotgroups;
3049
3050         /*
3051          * HBA base + 0xFC [15:0] - vendor-specific hardware interface
3052          * info register:
3053          * [15:8] hardware/software interface rev#
3054          * [   3] asic-style interface
3055          * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
3056          */
3057         hwdata = readl(dd->mmio + HOST_HSORG);
3058
3059         dd->product_type = MTIP_PRODUCT_UNKNOWN;
3060         dd->slot_groups = 1;
3061
3062         if (hwdata & 0x8) {
3063                 dd->product_type = MTIP_PRODUCT_ASICFPGA;
3064                 rev = (hwdata & HSORG_HWREV) >> 8;
3065                 slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
3066                 dev_info(&dd->pdev->dev,
3067                         "ASIC-FPGA design, HS rev 0x%x, "
3068                         "%i slot groups [%i slots]\n",
3069                          rev,
3070                          slotgroups,
3071                          slotgroups * 32);
3072
3073                 if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
3074                         dev_warn(&dd->pdev->dev,
3075                                 "Warning: driver only supports "
3076                                 "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
3077                         slotgroups = MTIP_MAX_SLOT_GROUPS;
3078                 }
3079                 dd->slot_groups = slotgroups;
3080                 return;
3081         }
3082
3083         dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
3084 }
3085
3086 /*
3087  * Blocking wait for FTL rebuild to complete
3088  *
3089  * @dd Pointer to the DRIVER_DATA structure.
3090  *
3091  * return value
3092  *      0       FTL rebuild completed successfully
3093  *      -EFAULT FTL rebuild error/timeout/interruption
3094  */
3095 static int mtip_ftl_rebuild_poll(struct driver_data *dd)
3096 {
3097         unsigned long timeout, cnt = 0, start;
3098
3099         dev_warn(&dd->pdev->dev,
3100                 "FTL rebuild in progress. Polling for completion.\n");
3101
3102         start = jiffies;
3103         timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
3104
3105         do {
3106                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
3107                                 &dd->dd_flag)))
3108                         return -EFAULT;
3109                 if (mtip_check_surprise_removal(dd->pdev))
3110                         return -EFAULT;
3111
3112                 if (mtip_get_identify(dd->port, NULL) < 0)
3113                         return -EFAULT;
3114
3115                 if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
3116                         MTIP_FTL_REBUILD_MAGIC) {
3117                         ssleep(1);
3118                         /* Print message every 3 minutes */
3119                         if (cnt++ >= 180) {
3120                                 dev_warn(&dd->pdev->dev,
3121                                 "FTL rebuild in progress (%d secs).\n",
3122                                 jiffies_to_msecs(jiffies - start) / 1000);
3123                                 cnt = 0;
3124                         }
3125                 } else {
3126                         dev_warn(&dd->pdev->dev,
3127                                 "FTL rebuild complete (%d secs).\n",
3128                         jiffies_to_msecs(jiffies - start) / 1000);
3129                         mtip_block_initialize(dd);
3130                         return 0;
3131                 }
3132                 ssleep(10);
3133         } while (time_before(jiffies, timeout));
3134
3135         /* Check for timeout */
3136         dev_err(&dd->pdev->dev,
3137                 "Timed out waiting for FTL rebuild to complete (%d secs).\n",
3138                 jiffies_to_msecs(jiffies - start) / 1000);
3139         return -EFAULT;
3140 }
3141
3142 /*
3143  * service thread to issue queued commands
3144  *
3145  * @data Pointer to the driver data structure.
3146  *
3147  * return value
3148  *      0
3149  */
3150
3151 static int mtip_service_thread(void *data)
3152 {
3153         struct driver_data *dd = (struct driver_data *)data;
3154         unsigned long slot, slot_start, slot_wrap;
3155         unsigned int num_cmd_slots = dd->slot_groups * 32;
3156         struct mtip_port *port = dd->port;
3157
3158         while (1) {
3159                 /*
3160                  * the condition is to check neither an internal command is
3161                  * is in progress nor error handling is active
3162                  */
3163                 wait_event_interruptible(port->svc_wait, (port->flags) &&
3164                         !(port->flags & MTIP_PF_PAUSE_IO));
3165
3166                 if (kthread_should_stop())
3167                         break;
3168
3169                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
3170                                 &dd->dd_flag)))
3171                         break;
3172
3173                 set_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
3174                 if (test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
3175                         slot = 1;
3176                         /* used to restrict the loop to one iteration */
3177                         slot_start = num_cmd_slots;
3178                         slot_wrap = 0;
3179                         while (1) {
3180                                 slot = find_next_bit(port->cmds_to_issue,
3181                                                 num_cmd_slots, slot);
3182                                 if (slot_wrap == 1) {
3183                                         if ((slot_start >= slot) ||
3184                                                 (slot >= num_cmd_slots))
3185                                                 break;
3186                                 }
3187                                 if (unlikely(slot_start == num_cmd_slots))
3188                                         slot_start = slot;
3189
3190                                 if (unlikely(slot == num_cmd_slots)) {
3191                                         slot = 1;
3192                                         slot_wrap = 1;
3193                                         continue;
3194                                 }
3195
3196                                 /* Issue the command to the hardware */
3197                                 mtip_issue_ncq_command(port, slot);
3198
3199                                 clear_bit(slot, port->cmds_to_issue);
3200                         }
3201
3202                         clear_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
3203                 } else if (test_bit(MTIP_PF_REBUILD_BIT, &port->flags)) {
3204                         if (!mtip_ftl_rebuild_poll(dd))
3205                                 set_bit(MTIP_DDF_REBUILD_FAILED_BIT,
3206                                                         &dd->dd_flag);
3207                         clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
3208                 }
3209                 clear_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
3210
3211                 if (test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
3212                         break;
3213         }
3214         return 0;
3215 }
3216
3217 /*
3218  * Called once for each card.
3219  *
3220  * @dd Pointer to the driver data structure.
3221  *
3222  * return value
3223  *      0 on success, else an error code.
3224  */
3225 static int mtip_hw_init(struct driver_data *dd)
3226 {
3227         int i;
3228         int rv;
3229         unsigned int num_command_slots;
3230         unsigned long timeout, timetaken;
3231         unsigned char *buf;
3232         struct smart_attr attr242;
3233
3234         dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
3235
3236         mtip_detect_product(dd);
3237         if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
3238                 rv = -EIO;
3239                 goto out1;
3240         }
3241         num_command_slots = dd->slot_groups * 32;
3242
3243         hba_setup(dd);
3244
3245         dd->port = kzalloc_node(sizeof(struct mtip_port), GFP_KERNEL,
3246                                 dd->numa_node);
3247         if (!dd->port) {
3248                 dev_err(&dd->pdev->dev,
3249                         "Memory allocation: port structure\n");
3250                 return -ENOMEM;
3251         }
3252
3253         /* Continue workqueue setup */
3254         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
3255                 dd->work[i].port = dd->port;
3256
3257         /* Enable unaligned IO constraints for some devices */
3258         if (mtip_device_unaligned_constrained(dd))
3259                 dd->unal_qdepth = MTIP_MAX_UNALIGNED_SLOTS;
3260         else
3261                 dd->unal_qdepth = 0;
3262
3263         /* Counting semaphore to track command slot usage */
3264         sema_init(&dd->port->cmd_slot, num_command_slots - 1 - dd->unal_qdepth);
3265         sema_init(&dd->port->cmd_slot_unal, dd->unal_qdepth);
3266
3267         /* Spinlock to prevent concurrent issue */
3268         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
3269                 spin_lock_init(&dd->port->cmd_issue_lock[i]);
3270
3271         /* Set the port mmio base address. */
3272         dd->port->mmio  = dd->mmio + PORT_OFFSET;
3273         dd->port->dd    = dd;
3274
3275         /* Allocate memory for the command list. */
3276         dd->port->command_list =
3277                 dmam_alloc_coherent(&dd->pdev->dev,
3278                         HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3279                         &dd->port->command_list_dma,
3280                         GFP_KERNEL);
3281         if (!dd->port->command_list) {
3282                 dev_err(&dd->pdev->dev,
3283                         "Memory allocation: command list\n");
3284                 rv = -ENOMEM;
3285                 goto out1;
3286         }
3287
3288         /* Clear the memory we have allocated. */
3289         memset(dd->port->command_list,
3290                 0,
3291                 HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4));
3292
3293         /* Setup the addresse of the RX FIS. */
3294         dd->port->rxfis     = dd->port->command_list + HW_CMD_SLOT_SZ;
3295         dd->port->rxfis_dma = dd->port->command_list_dma + HW_CMD_SLOT_SZ;
3296
3297         /* Setup the address of the command tables. */
3298         dd->port->command_table   = dd->port->rxfis + AHCI_RX_FIS_SZ;
3299         dd->port->command_tbl_dma = dd->port->rxfis_dma + AHCI_RX_FIS_SZ;
3300
3301         /* Setup the address of the identify data. */
3302         dd->port->identify     = dd->port->command_table +
3303                                         HW_CMD_TBL_AR_SZ;
3304         dd->port->identify_dma = dd->port->command_tbl_dma +
3305                                         HW_CMD_TBL_AR_SZ;
3306
3307         /* Setup the address of the sector buffer - for some non-ncq cmds */
3308         dd->port->sector_buffer = (void *) dd->port->identify + ATA_SECT_SIZE;
3309         dd->port->sector_buffer_dma = dd->port->identify_dma + ATA_SECT_SIZE;
3310
3311         /* Setup the address of the log buf - for read log command */
3312         dd->port->log_buf = (void *)dd->port->sector_buffer  + ATA_SECT_SIZE;
3313         dd->port->log_buf_dma = dd->port->sector_buffer_dma + ATA_SECT_SIZE;
3314
3315         /* Setup the address of the smart buf - for smart read data command */
3316         dd->port->smart_buf = (void *)dd->port->log_buf  + ATA_SECT_SIZE;
3317         dd->port->smart_buf_dma = dd->port->log_buf_dma + ATA_SECT_SIZE;
3318
3319
3320         /* Point the command headers at the command tables. */
3321         for (i = 0; i < num_command_slots; i++) {
3322                 dd->port->commands[i].command_header =
3323                                         dd->port->command_list +
3324                                         (sizeof(struct mtip_cmd_hdr) * i);
3325                 dd->port->commands[i].command_header_dma =
3326                                         dd->port->command_list_dma +
3327                                         (sizeof(struct mtip_cmd_hdr) * i);
3328
3329                 dd->port->commands[i].command =
3330                         dd->port->command_table + (HW_CMD_TBL_SZ * i);
3331                 dd->port->commands[i].command_dma =
3332                         dd->port->command_tbl_dma + (HW_CMD_TBL_SZ * i);
3333
3334                 if (readl(dd->mmio + HOST_CAP) & HOST_CAP_64)
3335                         dd->port->commands[i].command_header->ctbau =
3336                         __force_bit2int cpu_to_le32(
3337                         (dd->port->commands[i].command_dma >> 16) >> 16);
3338                 dd->port->commands[i].command_header->ctba =
3339                         __force_bit2int cpu_to_le32(
3340                         dd->port->commands[i].command_dma & 0xFFFFFFFF);
3341
3342                 /*
3343                  * If this is not done, a bug is reported by the stock
3344                  * FC11 i386. Due to the fact that it has lots of kernel
3345                  * debugging enabled.
3346                  */
3347                 sg_init_table(dd->port->commands[i].sg, MTIP_MAX_SG);
3348
3349                 /* Mark all commands as currently inactive.*/
3350                 atomic_set(&dd->port->commands[i].active, 0);
3351         }
3352
3353         /* Setup the pointers to the extended s_active and CI registers. */
3354         for (i = 0; i < dd->slot_groups; i++) {
3355                 dd->port->s_active[i] =
3356                         dd->port->mmio + i*0x80 + PORT_SCR_ACT;
3357                 dd->port->cmd_issue[i] =
3358                         dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
3359                 dd->port->completed[i] =
3360                         dd->port->mmio + i*0x80 + PORT_SDBV;
3361         }
3362
3363         timetaken = jiffies;
3364         timeout = jiffies + msecs_to_jiffies(30000);
3365         while (((readl(dd->port->mmio + PORT_SCR_STAT) & 0x0F) != 0x03) &&
3366                  time_before(jiffies, timeout)) {
3367                 mdelay(100);
3368         }
3369         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
3370                 timetaken = jiffies - timetaken;
3371                 dev_warn(&dd->pdev->dev,
3372                         "Surprise removal detected at %u ms\n",
3373                         jiffies_to_msecs(timetaken));
3374                 rv = -ENODEV;
3375                 goto out2 ;
3376         }
3377         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
3378                 timetaken = jiffies - timetaken;
3379                 dev_warn(&dd->pdev->dev,
3380                         "Removal detected at %u ms\n",
3381                         jiffies_to_msecs(timetaken));
3382                 rv = -EFAULT;
3383                 goto out2;
3384         }
3385
3386         /* Conditionally reset the HBA. */
3387         if (!(readl(dd->mmio + HOST_CAP) & HOST_CAP_NZDMA)) {
3388                 if (mtip_hba_reset(dd) < 0) {
3389                         dev_err(&dd->pdev->dev,
3390                                 "Card did not reset within timeout\n");
3391                         rv = -EIO;
3392                         goto out2;
3393                 }
3394         } else {
3395                 /* Clear any pending interrupts on the HBA */
3396                 writel(readl(dd->mmio + HOST_IRQ_STAT),
3397                         dd->mmio + HOST_IRQ_STAT);
3398         }
3399
3400         mtip_init_port(dd->port);
3401         mtip_start_port(dd->port);
3402
3403         /* Setup the ISR and enable interrupts. */
3404         rv = devm_request_irq(&dd->pdev->dev,
3405                                 dd->pdev->irq,
3406                                 mtip_irq_handler,
3407                                 IRQF_SHARED,
3408                                 dev_driver_string(&dd->pdev->dev),
3409                                 dd);
3410
3411         if (rv) {
3412                 dev_err(&dd->pdev->dev,
3413                         "Unable to allocate IRQ %d\n", dd->pdev->irq);
3414                 goto out2;
3415         }
3416         irq_set_affinity_hint(dd->pdev->irq, get_cpu_mask(dd->isr_binding));
3417
3418         /* Enable interrupts on the HBA. */
3419         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3420                                         dd->mmio + HOST_CTL);
3421
3422         init_timer(&dd->port->cmd_timer);
3423         init_waitqueue_head(&dd->port->svc_wait);
3424
3425         dd->port->cmd_timer.data = (unsigned long int) dd->port;
3426         dd->port->cmd_timer.function = mtip_timeout_function;
3427         mod_timer(&dd->port->cmd_timer,
3428                 jiffies + msecs_to_jiffies(MTIP_TIMEOUT_CHECK_PERIOD));
3429
3430
3431         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
3432                 rv = -EFAULT;
3433                 goto out3;
3434         }
3435
3436         if (mtip_get_identify(dd->port, NULL) < 0) {
3437                 rv = -EFAULT;
3438                 goto out3;
3439         }
3440
3441         if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
3442                 MTIP_FTL_REBUILD_MAGIC) {
3443                 set_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags);
3444                 return MTIP_FTL_REBUILD_MAGIC;
3445         }
3446         mtip_dump_identify(dd->port);
3447
3448         /* check write protect, over temp and rebuild statuses */
3449         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
3450                                 dd->port->log_buf,
3451                                 dd->port->log_buf_dma, 1);
3452         if (rv) {
3453                 dev_warn(&dd->pdev->dev,
3454                         "Error in READ LOG EXT (10h) command\n");
3455                 /* non-critical error, don't fail the load */
3456         } else {
3457                 buf = (unsigned char *)dd->port->log_buf;
3458                 if (buf[259] & 0x1) {
3459                         dev_info(&dd->pdev->dev,
3460                                 "Write protect bit is set.\n");
3461                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
3462                 }
3463                 if (buf[288] == 0xF7) {
3464                         dev_info(&dd->pdev->dev,
3465                                 "Exceeded Tmax, drive in thermal shutdown.\n");
3466                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
3467                 }
3468                 if (buf[288] == 0xBF) {
3469                         dev_info(&dd->pdev->dev,
3470                                 "Drive indicates rebuild has failed.\n");
3471                         /* TODO */
3472                 }
3473         }
3474
3475         /* get write protect progess */
3476         memset(&attr242, 0, sizeof(struct smart_attr));
3477         if (mtip_get_smart_attr(dd->port, 242, &attr242))
3478                 dev_warn(&dd->pdev->dev,
3479                                 "Unable to check write protect progress\n");
3480         else
3481                 dev_info(&dd->pdev->dev,
3482                                 "Write protect progress: %u%% (%u blocks)\n",
3483                                 attr242.cur, le32_to_cpu(attr242.data));
3484         return rv;
3485
3486 out3:
3487         del_timer_sync(&dd->port->cmd_timer);
3488
3489         /* Disable interrupts on the HBA. */
3490         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3491                         dd->mmio + HOST_CTL);
3492
3493         /* Release the IRQ. */
3494         irq_set_affinity_hint(dd->pdev->irq, NULL);
3495         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3496
3497 out2:
3498         mtip_deinit_port(dd->port);
3499
3500         /* Free the command/command header memory. */
3501         dmam_free_coherent(&dd->pdev->dev,
3502                                 HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3503                                 dd->port->command_list,
3504                                 dd->port->command_list_dma);
3505 out1:
3506         /* Free the memory allocated for the for structure. */
3507         kfree(dd->port);
3508
3509         return rv;
3510 }
3511
3512 /*
3513  * Called to deinitialize an interface.
3514  *
3515  * @dd Pointer to the driver data structure.
3516  *
3517  * return value
3518  *      0
3519  */
3520 static int mtip_hw_exit(struct driver_data *dd)
3521 {
3522         /*
3523          * Send standby immediate (E0h) to the drive so that it
3524          * saves its state.
3525          */
3526         if (!test_bit(MTIP_DDF_CLEANUP_BIT, &dd->dd_flag)) {
3527
3528                 if (!test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags))
3529                         if (mtip_standby_immediate(dd->port))
3530                                 dev_warn(&dd->pdev->dev,
3531                                         "STANDBY IMMEDIATE failed\n");
3532
3533                 /* de-initialize the port. */
3534                 mtip_deinit_port(dd->port);
3535
3536                 /* Disable interrupts on the HBA. */
3537                 writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3538                                 dd->mmio + HOST_CTL);
3539         }
3540
3541         del_timer_sync(&dd->port->cmd_timer);
3542
3543         /* Release the IRQ. */
3544         irq_set_affinity_hint(dd->pdev->irq, NULL);
3545         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3546
3547         /* Free the command/command header memory. */
3548         dmam_free_coherent(&dd->pdev->dev,
3549                         HW_PORT_PRIV_DMA_SZ + (ATA_SECT_SIZE * 4),
3550                         dd->port->command_list,
3551                         dd->port->command_list_dma);
3552         /* Free the memory allocated for the for structure. */
3553         kfree(dd->port);
3554
3555         return 0;
3556 }
3557
3558 /*
3559  * Issue a Standby Immediate command to the device.
3560  *
3561  * This function is called by the Block Layer just before the
3562  * system powers off during a shutdown.
3563  *
3564  * @dd Pointer to the driver data structure.
3565  *
3566  * return value
3567  *      0
3568  */
3569 static int mtip_hw_shutdown(struct driver_data *dd)
3570 {
3571         /*
3572          * Send standby immediate (E0h) to the drive so that it
3573          * saves its state.
3574          */
3575         mtip_standby_immediate(dd->port);
3576
3577         return 0;
3578 }
3579
3580 /*
3581  * Suspend function
3582  *
3583  * This function is called by the Block Layer just before the
3584  * system hibernates.
3585  *
3586  * @dd Pointer to the driver data structure.
3587  *
3588  * return value
3589  *      0       Suspend was successful
3590  *      -EFAULT Suspend was not successful
3591  */
3592 static int mtip_hw_suspend(struct driver_data *dd)
3593 {
3594         /*
3595          * Send standby immediate (E0h) to the drive
3596          * so that it saves its state.
3597          */
3598         if (mtip_standby_immediate(dd->port) != 0) {
3599                 dev_err(&dd->pdev->dev,
3600                         "Failed standby-immediate command\n");
3601                 return -EFAULT;
3602         }
3603
3604         /* Disable interrupts on the HBA.*/
3605         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3606                         dd->mmio + HOST_CTL);
3607         mtip_deinit_port(dd->port);
3608
3609         return 0;
3610 }
3611
3612 /*
3613  * Resume function
3614  *
3615  * This function is called by the Block Layer as the
3616  * system resumes.
3617  *
3618  * @dd Pointer to the driver data structure.
3619  *
3620  * return value
3621  *      0       Resume was successful
3622  *      -EFAULT Resume was not successful
3623  */
3624 static int mtip_hw_resume(struct driver_data *dd)
3625 {
3626         /* Perform any needed hardware setup steps */
3627         hba_setup(dd);
3628
3629         /* Reset the HBA */
3630         if (mtip_hba_reset(dd) != 0) {
3631                 dev_err(&dd->pdev->dev,
3632                         "Unable to reset the HBA\n");
3633                 return -EFAULT;
3634         }
3635
3636         /*
3637          * Enable the port, DMA engine, and FIS reception specific
3638          * h/w in controller.
3639          */
3640         mtip_init_port(dd->port);
3641         mtip_start_port(dd->port);
3642
3643         /* Enable interrupts on the HBA.*/
3644         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3645                         dd->mmio + HOST_CTL);
3646
3647         return 0;
3648 }
3649
3650 /*
3651  * Helper function for reusing disk name
3652  * upon hot insertion.
3653  */
3654 static int rssd_disk_name_format(char *prefix,
3655                                  int index,
3656                                  char *buf,
3657                                  int buflen)
3658 {
3659         const int base = 'z' - 'a' + 1;
3660         char *begin = buf + strlen(prefix);
3661         char *end = buf + buflen;
3662         char *p;
3663         int unit;
3664
3665         p = end - 1;
3666         *p = '\0';
3667         unit = base;
3668         do {
3669                 if (p == begin)
3670                         return -EINVAL;
3671                 *--p = 'a' + (index % unit);
3672                 index = (index / unit) - 1;
3673         } while (index >= 0);
3674
3675         memmove(begin, p, end - p);
3676         memcpy(buf, prefix, strlen(prefix));
3677
3678         return 0;
3679 }
3680
3681 /*
3682  * Block layer IOCTL handler.
3683  *
3684  * @dev Pointer to the block_device structure.
3685  * @mode ignored
3686  * @cmd IOCTL command passed from the user application.
3687  * @arg Argument passed from the user application.
3688  *
3689  * return value
3690  *      0        IOCTL completed successfully.
3691  *      -ENOTTY  IOCTL not supported or invalid driver data
3692  *                 structure pointer.
3693  */
3694 static int mtip_block_ioctl(struct block_device *dev,
3695                             fmode_t mode,
3696                             unsigned cmd,
3697                             unsigned long arg)
3698 {
3699         struct driver_data *dd = dev->bd_disk->private_data;
3700
3701         if (!capable(CAP_SYS_ADMIN))
3702                 return -EACCES;
3703
3704         if (!dd)
3705                 return -ENOTTY;
3706
3707         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3708                 return -ENOTTY;
3709
3710         switch (cmd) {
3711         case BLKFLSBUF:
3712                 return -ENOTTY;
3713         default:
3714                 return mtip_hw_ioctl(dd, cmd, arg);
3715         }
3716 }
3717
3718 #ifdef CONFIG_COMPAT
3719 /*
3720  * Block layer compat IOCTL handler.
3721  *
3722  * @dev Pointer to the block_device structure.
3723  * @mode ignored
3724  * @cmd IOCTL command passed from the user application.
3725  * @arg Argument passed from the user application.
3726  *
3727  * return value
3728  *      0        IOCTL completed successfully.
3729  *      -ENOTTY  IOCTL not supported or invalid driver data
3730  *                 structure pointer.
3731  */
3732 static int mtip_block_compat_ioctl(struct block_device *dev,
3733                             fmode_t mode,
3734                             unsigned cmd,
3735                             unsigned long arg)
3736 {
3737         struct driver_data *dd = dev->bd_disk->private_data;
3738
3739         if (!capable(CAP_SYS_ADMIN))
3740                 return -EACCES;
3741
3742         if (!dd)
3743                 return -ENOTTY;
3744
3745         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3746                 return -ENOTTY;
3747
3748         switch (cmd) {
3749         case BLKFLSBUF:
3750                 return -ENOTTY;
3751         case HDIO_DRIVE_TASKFILE: {
3752                 struct mtip_compat_ide_task_request_s __user *compat_req_task;
3753                 ide_task_request_t req_task;
3754                 int compat_tasksize, outtotal, ret;
3755
3756                 compat_tasksize =
3757                         sizeof(struct mtip_compat_ide_task_request_s);
3758
3759                 compat_req_task =
3760                         (struct mtip_compat_ide_task_request_s __user *) arg;
3761
3762                 if (copy_from_user(&req_task, (void __user *) arg,
3763                         compat_tasksize - (2 * sizeof(compat_long_t))))
3764                         return -EFAULT;
3765
3766                 if (get_user(req_task.out_size, &compat_req_task->out_size))
3767                         return -EFAULT;
3768
3769                 if (get_user(req_task.in_size, &compat_req_task->in_size))
3770                         return -EFAULT;
3771
3772                 outtotal = sizeof(struct mtip_compat_ide_task_request_s);
3773
3774                 ret = exec_drive_taskfile(dd, (void __user *) arg,
3775                                                 &req_task, outtotal);
3776
3777                 if (copy_to_user((void __user *) arg, &req_task,
3778                                 compat_tasksize -
3779                                 (2 * sizeof(compat_long_t))))
3780                         return -EFAULT;
3781
3782                 if (put_user(req_task.out_size, &compat_req_task->out_size))
3783                         return -EFAULT;
3784
3785                 if (put_user(req_task.in_size, &compat_req_task->in_size))
3786                         return -EFAULT;
3787
3788                 return ret;
3789         }
3790         default:
3791                 return mtip_hw_ioctl(dd, cmd, arg);
3792         }
3793 }
3794 #endif
3795
3796 /*
3797  * Obtain the geometry of the device.
3798  *
3799  * You may think that this function is obsolete, but some applications,
3800  * fdisk for example still used CHS values. This function describes the
3801  * device as having 224 heads and 56 sectors per cylinder. These values are
3802  * chosen so that each cylinder is aligned on a 4KB boundary. Since a
3803  * partition is described in terms of a start and end cylinder this means
3804  * that each partition is also 4KB aligned. Non-aligned partitions adversely
3805  * affects performance.
3806  *
3807  * @dev Pointer to the block_device strucutre.
3808  * @geo Pointer to a hd_geometry structure.
3809  *
3810  * return value
3811  *      0       Operation completed successfully.
3812  *      -ENOTTY An error occurred while reading the drive capacity.
3813  */
3814 static int mtip_block_getgeo(struct block_device *dev,
3815                                 struct hd_geometry *geo)
3816 {
3817         struct driver_data *dd = dev->bd_disk->private_data;
3818         sector_t capacity;
3819
3820         if (!dd)
3821                 return -ENOTTY;
3822
3823         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3824                 dev_warn(&dd->pdev->dev,
3825                         "Could not get drive capacity.\n");
3826                 return -ENOTTY;
3827         }
3828
3829         geo->heads = 224;
3830         geo->sectors = 56;
3831         sector_div(capacity, (geo->heads * geo->sectors));
3832         geo->cylinders = capacity;
3833         return 0;
3834 }
3835
3836 /*
3837  * Block device operation function.
3838  *
3839  * This structure contains pointers to the functions required by the block
3840  * layer.
3841  */
3842 static const struct block_device_operations mtip_block_ops = {
3843         .ioctl          = mtip_block_ioctl,
3844 #ifdef CONFIG_COMPAT
3845         .compat_ioctl   = mtip_block_compat_ioctl,
3846 #endif
3847         .getgeo         = mtip_block_getgeo,
3848         .owner          = THIS_MODULE
3849 };
3850
3851 /*
3852  * Block layer make request function.
3853  *
3854  * This function is called by the kernel to process a BIO for
3855  * the P320 device.
3856  *
3857  * @queue Pointer to the request queue. Unused other than to obtain
3858  *              the driver data structure.
3859  * @bio   Pointer to the BIO.
3860  *
3861  */
3862 static void mtip_make_request(struct request_queue *queue, struct bio *bio)
3863 {
3864         struct driver_data *dd = queue->queuedata;
3865         struct scatterlist *sg;
3866         struct bio_vec *bvec;
3867         int i, nents = 0;
3868         int tag = 0, unaligned = 0;
3869
3870         if (unlikely(dd->dd_flag & MTIP_DDF_STOP_IO)) {
3871                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
3872                                                         &dd->dd_flag))) {
3873                         bio_endio(bio, -ENXIO);
3874                         return;
3875                 }
3876                 if (unlikely(test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))) {
3877                         bio_endio(bio, -ENODATA);
3878                         return;
3879                 }
3880                 if (unlikely(test_bit(MTIP_DDF_WRITE_PROTECT_BIT,
3881                                                         &dd->dd_flag) &&
3882                                 bio_data_dir(bio))) {
3883                         bio_endio(bio, -ENODATA);
3884                         return;
3885                 }
3886                 if (unlikely(test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag))) {
3887                         bio_endio(bio, -ENODATA);
3888                         return;
3889                 }
3890         }
3891
3892         if (unlikely(bio->bi_rw & REQ_DISCARD)) {
3893                 bio_endio(bio, mtip_send_trim(dd, bio->bi_sector,
3894                                                 bio_sectors(bio)));
3895                 return;
3896         }
3897
3898         if (unlikely(!bio_has_data(bio))) {
3899                 blk_queue_flush(queue, 0);
3900                 bio_endio(bio, 0);
3901                 return;
3902         }
3903
3904         if (bio_data_dir(bio) == WRITE && bio_sectors(bio) <= 64 &&
3905                                                         dd->unal_qdepth) {
3906                 if (bio->bi_sector % 8 != 0) /* Unaligned on 4k boundaries */
3907                         unaligned = 1;
3908                 else if (bio_sectors(bio) % 8 != 0) /* Aligned but not 4k/8k */
3909                         unaligned = 1;
3910         }
3911
3912         sg = mtip_hw_get_scatterlist(dd, &tag, unaligned);
3913         if (likely(sg != NULL)) {
3914                 blk_queue_bounce(queue, &bio);
3915
3916                 if (unlikely((bio)->bi_vcnt > MTIP_MAX_SG)) {
3917                         dev_warn(&dd->pdev->dev,
3918                                 "Maximum number of SGL entries exceeded\n");
3919                         bio_io_error(bio);
3920                         mtip_hw_release_scatterlist(dd, tag, unaligned);
3921                         return;
3922                 }
3923
3924                 /* Create the scatter list for this bio. */
3925                 bio_for_each_segment(bvec, bio, i) {
3926                         sg_set_page(&sg[nents],
3927                                         bvec->bv_page,
3928                                         bvec->bv_len,
3929                                         bvec->bv_offset);
3930                         nents++;
3931                 }
3932
3933                 /* Issue the read/write. */
3934                 mtip_hw_submit_io(dd,
3935                                 bio->bi_sector,
3936                                 bio_sectors(bio),
3937                                 nents,
3938                                 tag,
3939                                 bio_endio,
3940                                 bio,
3941                                 bio_data_dir(bio),
3942                                 unaligned);
3943         } else
3944                 bio_io_error(bio);
3945 }
3946
3947 /*
3948  * Block layer initialization function.
3949  *
3950  * This function is called once by the PCI layer for each P320
3951  * device that is connected to the system.
3952  *
3953  * @dd Pointer to the driver data structure.
3954  *
3955  * return value
3956  *      0 on success else an error code.
3957  */
3958 static int mtip_block_initialize(struct driver_data *dd)
3959 {
3960         int rv = 0, wait_for_rebuild = 0;
3961         sector_t capacity;
3962         unsigned int index = 0;
3963         struct kobject *kobj;
3964         unsigned char thd_name[16];
3965
3966         if (dd->disk)
3967                 goto skip_create_disk; /* hw init done, before rebuild */
3968
3969         /* Initialize the protocol layer. */
3970         wait_for_rebuild = mtip_hw_init(dd);
3971         if (wait_for_rebuild < 0) {
3972                 dev_err(&dd->pdev->dev,
3973                         "Protocol layer initialization failed\n");
3974                 rv = -EINVAL;
3975                 goto protocol_init_error;
3976         }
3977
3978         dd->disk = alloc_disk_node(MTIP_MAX_MINORS, dd->numa_node);
3979         if (dd->disk  == NULL) {
3980                 dev_err(&dd->pdev->dev,
3981                         "Unable to allocate gendisk structure\n");
3982                 rv = -EINVAL;
3983                 goto alloc_disk_error;
3984         }
3985
3986         /* Generate the disk name, implemented same as in sd.c */
3987         do {
3988                 if (!ida_pre_get(&rssd_index_ida, GFP_KERNEL))
3989                         goto ida_get_error;
3990
3991                 spin_lock(&rssd_index_lock);
3992                 rv = ida_get_new(&rssd_index_ida, &index);
3993                 spin_unlock(&rssd_index_lock);
3994         } while (rv == -EAGAIN);
3995
3996         if (rv)
3997                 goto ida_get_error;
3998
3999         rv = rssd_disk_name_format("rssd",
4000                                 index,
4001                                 dd->disk->disk_name,
4002                                 DISK_NAME_LEN);
4003         if (rv)
4004                 goto disk_index_error;
4005
4006         dd->disk->driverfs_dev  = &dd->pdev->dev;
4007         dd->disk->major         = dd->major;
4008         dd->disk->first_minor   = dd->instance * MTIP_MAX_MINORS;
4009         dd->disk->fops          = &mtip_block_ops;
4010         dd->disk->private_data  = dd;
4011         dd->index               = index;
4012
4013         /*
4014          * if rebuild pending, start the service thread, and delay the block
4015          * queue creation and add_disk()
4016          */
4017         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
4018                 goto start_service_thread;
4019
4020 skip_create_disk:
4021         /* Allocate the request queue. */
4022         dd->queue = blk_alloc_queue_node(GFP_KERNEL, dd->numa_node);
4023         if (dd->queue == NULL) {
4024                 dev_err(&dd->pdev->dev,
4025                         "Unable to allocate request queue\n");
4026                 rv = -ENOMEM;
4027                 goto block_queue_alloc_init_error;
4028         }
4029
4030         /* Attach our request function to the request queue. */
4031         blk_queue_make_request(dd->queue, mtip_make_request);
4032
4033         dd->disk->queue         = dd->queue;
4034         dd->queue->queuedata    = dd;
4035
4036         /* Set device limits. */
4037         set_bit(QUEUE_FLAG_NONROT, &dd->queue->queue_flags);
4038         blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
4039         blk_queue_physical_block_size(dd->queue, 4096);
4040         blk_queue_max_hw_sectors(dd->queue, 0xffff);
4041         blk_queue_max_segment_size(dd->queue, 0x400000);
4042         blk_queue_io_min(dd->queue, 4096);
4043
4044         /*
4045          * write back cache is not supported in the device. FUA depends on
4046          * write back cache support, hence setting flush support to zero.
4047          */
4048         blk_queue_flush(dd->queue, 0);
4049
4050         /* Signal trim support */
4051         if (dd->trim_supp == true) {
4052                 set_bit(QUEUE_FLAG_DISCARD, &dd->queue->queue_flags);
4053                 dd->queue->limits.discard_granularity = 4096;
4054                 blk_queue_max_discard_sectors(dd->queue,
4055                         MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES);
4056                 dd->queue->limits.discard_zeroes_data = 0;
4057         }
4058
4059         /* Set the capacity of the device in 512 byte sectors. */
4060         if (!(mtip_hw_get_capacity(dd, &capacity))) {
4061                 dev_warn(&dd->pdev->dev,
4062                         "Could not read drive capacity\n");
4063                 rv = -EIO;
4064                 goto read_capacity_error;
4065         }
4066         set_capacity(dd->disk, capacity);
4067
4068         /* Enable the block device and add it to /dev */
4069         add_disk(dd->disk);
4070
4071         /*
4072          * Now that the disk is active, initialize any sysfs attributes
4073          * managed by the protocol layer.
4074          */
4075         kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
4076         if (kobj) {
4077                 mtip_hw_sysfs_init(dd, kobj);
4078                 kobject_put(kobj);
4079         }
4080         mtip_hw_debugfs_init(dd);
4081
4082         if (dd->mtip_svc_handler) {
4083                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4084                 return rv; /* service thread created for handling rebuild */
4085         }
4086
4087 start_service_thread:
4088         sprintf(thd_name, "mtip_svc_thd_%02d", index);
4089         dd->mtip_svc_handler = kthread_create_on_node(mtip_service_thread,
4090                                                 dd, dd->numa_node, thd_name);
4091
4092         if (IS_ERR(dd->mtip_svc_handler)) {
4093                 dev_err(&dd->pdev->dev, "service thread failed to start\n");
4094                 dd->mtip_svc_handler = NULL;
4095                 rv = -EFAULT;
4096                 goto kthread_run_error;
4097         }
4098         wake_up_process(dd->mtip_svc_handler);
4099         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
4100                 rv = wait_for_rebuild;
4101
4102         return rv;
4103
4104 kthread_run_error:
4105         mtip_hw_debugfs_exit(dd);
4106
4107         /* Delete our gendisk. This also removes the device from /dev */
4108         del_gendisk(dd->disk);
4109
4110 read_capacity_error:
4111         blk_cleanup_queue(dd->queue);
4112
4113 block_queue_alloc_init_error:
4114 disk_index_error:
4115         spin_lock(&rssd_index_lock);
4116         ida_remove(&rssd_index_ida, index);
4117         spin_unlock(&rssd_index_lock);
4118
4119 ida_get_error:
4120         put_disk(dd->disk);
4121
4122 alloc_disk_error:
4123         mtip_hw_exit(dd); /* De-initialize the protocol layer. */
4124
4125 protocol_init_error:
4126         return rv;
4127 }
4128
4129 /*
4130  * Block layer deinitialization function.
4131  *
4132  * Called by the PCI layer as each P320 device is removed.
4133  *
4134  * @dd Pointer to the driver data structure.
4135  *
4136  * return value
4137  *      0
4138  */
4139 static int mtip_block_remove(struct driver_data *dd)
4140 {
4141         struct kobject *kobj;
4142
4143         if (dd->mtip_svc_handler) {
4144                 set_bit(MTIP_PF_SVC_THD_STOP_BIT, &dd->port->flags);
4145                 wake_up_interruptible(&dd->port->svc_wait);
4146                 kthread_stop(dd->mtip_svc_handler);
4147         }
4148
4149         /* Clean up the sysfs attributes, if created */
4150         if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag)) {
4151                 kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
4152                 if (kobj) {
4153                         mtip_hw_sysfs_exit(dd, kobj);
4154                         kobject_put(kobj);
4155                 }
4156         }
4157         mtip_hw_debugfs_exit(dd);
4158
4159         /*
4160          * Delete our gendisk structure. This also removes the device
4161          * from /dev
4162          */
4163         if (dd->disk) {
4164                 if (dd->disk->queue)
4165                         del_gendisk(dd->disk);
4166                 else
4167                         put_disk(dd->disk);
4168         }
4169
4170         spin_lock(&rssd_index_lock);
4171         ida_remove(&rssd_index_ida, dd->index);
4172         spin_unlock(&rssd_index_lock);
4173
4174         blk_cleanup_queue(dd->queue);
4175         dd->disk  = NULL;
4176         dd->queue = NULL;
4177
4178         /* De-initialize the protocol layer. */
4179         mtip_hw_exit(dd);
4180
4181         return 0;
4182 }
4183
4184 /*
4185  * Function called by the PCI layer when just before the
4186  * machine shuts down.
4187  *
4188  * If a protocol layer shutdown function is present it will be called
4189  * by this function.
4190  *
4191  * @dd Pointer to the driver data structure.
4192  *
4193  * return value
4194  *      0
4195  */
4196 static int mtip_block_shutdown(struct driver_data *dd)
4197 {
4198         /* Delete our gendisk structure, and cleanup the blk queue. */
4199         if (dd->disk) {
4200                 dev_info(&dd->pdev->dev,
4201                         "Shutting down %s ...\n", dd->disk->disk_name);
4202
4203                 if (dd->disk->queue) {
4204                         del_gendisk(dd->disk);
4205                         blk_cleanup_queue(dd->queue);
4206                 } else
4207                         put_disk(dd->disk);
4208                 dd->disk  = NULL;
4209                 dd->queue = NULL;
4210         }
4211
4212         spin_lock(&rssd_index_lock);
4213         ida_remove(&rssd_index_ida, dd->index);
4214         spin_unlock(&rssd_index_lock);
4215
4216         mtip_hw_shutdown(dd);
4217         return 0;
4218 }
4219
4220 static int mtip_block_suspend(struct driver_data *dd)
4221 {
4222         dev_info(&dd->pdev->dev,
4223                 "Suspending %s ...\n", dd->disk->disk_name);
4224         mtip_hw_suspend(dd);
4225         return 0;
4226 }
4227
4228 static int mtip_block_resume(struct driver_data *dd)
4229 {
4230         dev_info(&dd->pdev->dev, "Resuming %s ...\n",
4231                 dd->disk->disk_name);
4232         mtip_hw_resume(dd);
4233         return 0;
4234 }
4235
4236 static void drop_cpu(int cpu)
4237 {
4238         cpu_use[cpu]--;
4239 }
4240
4241 static int get_least_used_cpu_on_node(int node)
4242 {
4243         int cpu, least_used_cpu, least_cnt;
4244         const struct cpumask *node_mask;
4245
4246         node_mask = cpumask_of_node(node);
4247         least_used_cpu = cpumask_first(node_mask);
4248         least_cnt = cpu_use[least_used_cpu];
4249         cpu = least_used_cpu;
4250
4251         for_each_cpu(cpu, node_mask) {
4252                 if (cpu_use[cpu] < least_cnt) {
4253                         least_used_cpu = cpu;
4254                         least_cnt = cpu_use[cpu];
4255                 }
4256         }
4257         cpu_use[least_used_cpu]++;
4258         return least_used_cpu;
4259 }
4260
4261 /* Helper for selecting a node in round robin mode */
4262 static inline int mtip_get_next_rr_node(void)
4263 {
4264         static int next_node = -1;
4265
4266         if (next_node == -1) {
4267                 next_node = first_online_node;
4268                 return next_node;
4269         }
4270
4271         next_node = next_online_node(next_node);
4272         if (next_node == MAX_NUMNODES)
4273                 next_node = first_online_node;
4274         return next_node;
4275 }
4276
4277 static DEFINE_HANDLER(0);
4278 static DEFINE_HANDLER(1);
4279 static DEFINE_HANDLER(2);
4280 static DEFINE_HANDLER(3);
4281 static DEFINE_HANDLER(4);
4282 static DEFINE_HANDLER(5);
4283 static DEFINE_HANDLER(6);
4284 static DEFINE_HANDLER(7);
4285
4286 /*
4287  * Called for each supported PCI device detected.
4288  *
4289  * This function allocates the private data structure, enables the
4290  * PCI device and then calls the block layer initialization function.
4291  *
4292  * return value
4293  *      0 on success else an error code.
4294  */
4295 static int mtip_pci_probe(struct pci_dev *pdev,
4296                         const struct pci_device_id *ent)
4297 {
4298         int rv = 0;
4299         struct driver_data *dd = NULL;
4300         char cpu_list[256];
4301         const struct cpumask *node_mask;
4302         int cpu, i = 0, j = 0;
4303         int my_node = NUMA_NO_NODE;
4304         unsigned long flags;
4305
4306         /* Allocate memory for this devices private data. */
4307         my_node = pcibus_to_node(pdev->bus);
4308         if (my_node != NUMA_NO_NODE) {
4309                 if (!node_online(my_node))
4310                         my_node = mtip_get_next_rr_node();
4311         } else {
4312                 dev_info(&pdev->dev, "Kernel not reporting proximity, choosing a node\n");
4313                 my_node = mtip_get_next_rr_node();
4314         }
4315         dev_info(&pdev->dev, "NUMA node %d (closest: %d,%d, probe on %d:%d)\n",
4316                 my_node, pcibus_to_node(pdev->bus), dev_to_node(&pdev->dev),
4317                 cpu_to_node(smp_processor_id()), smp_processor_id());
4318
4319         dd = kzalloc_node(sizeof(struct driver_data), GFP_KERNEL, my_node);
4320         if (dd == NULL) {
4321                 dev_err(&pdev->dev,
4322                         "Unable to allocate memory for driver data\n");
4323                 return -ENOMEM;
4324         }
4325
4326         /* Attach the private data to this PCI device.  */
4327         pci_set_drvdata(pdev, dd);
4328
4329         rv = pcim_enable_device(pdev);
4330         if (rv < 0) {
4331                 dev_err(&pdev->dev, "Unable to enable device\n");
4332                 goto iomap_err;
4333         }
4334
4335         /* Map BAR5 to memory. */
4336         rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME);
4337         if (rv < 0) {
4338                 dev_err(&pdev->dev, "Unable to map regions\n");
4339                 goto iomap_err;
4340         }
4341
4342         if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
4343                 rv = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
4344
4345                 if (rv) {
4346                         rv = pci_set_consistent_dma_mask(pdev,
4347                                                 DMA_BIT_MASK(32));
4348                         if (rv) {
4349                                 dev_warn(&pdev->dev,
4350                                         "64-bit DMA enable failed\n");
4351                                 goto setmask_err;
4352                         }
4353                 }
4354         }
4355
4356         /* Copy the info we may need later into the private data structure. */
4357         dd->major       = mtip_major;
4358         dd->instance    = instance;
4359         dd->pdev        = pdev;
4360         dd->numa_node   = my_node;
4361
4362         INIT_LIST_HEAD(&dd->online_list);
4363         INIT_LIST_HEAD(&dd->remove_list);
4364
4365         memset(dd->workq_name, 0, 32);
4366         snprintf(dd->workq_name, 31, "mtipq%d", dd->instance);
4367
4368         dd->isr_workq = create_workqueue(dd->workq_name);
4369         if (!dd->isr_workq) {
4370                 dev_warn(&pdev->dev, "Can't create wq %d\n", dd->instance);
4371                 rv = -ENOMEM;
4372                 goto block_initialize_err;
4373         }
4374
4375         memset(cpu_list, 0, sizeof(cpu_list));
4376
4377         node_mask = cpumask_of_node(dd->numa_node);
4378         if (!cpumask_empty(node_mask)) {
4379                 for_each_cpu(cpu, node_mask)
4380                 {
4381                         snprintf(&cpu_list[j], 256 - j, "%d ", cpu);
4382                         j = strlen(cpu_list);
4383                 }
4384
4385                 dev_info(&pdev->dev, "Node %d on package %d has %d cpu(s): %s\n",
4386                         dd->numa_node,
4387                         topology_physical_package_id(cpumask_first(node_mask)),
4388                         nr_cpus_node(dd->numa_node),
4389                         cpu_list);
4390         } else
4391                 dev_dbg(&pdev->dev, "mtip32xx: node_mask empty\n");
4392
4393         dd->isr_binding = get_least_used_cpu_on_node(dd->numa_node);
4394         dev_info(&pdev->dev, "Initial IRQ binding node:cpu %d:%d\n",
4395                 cpu_to_node(dd->isr_binding), dd->isr_binding);
4396
4397         /* first worker context always runs in ISR */
4398         dd->work[0].cpu_binding = dd->isr_binding;
4399         dd->work[1].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4400         dd->work[2].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4401         dd->work[3].cpu_binding = dd->work[0].cpu_binding;
4402         dd->work[4].cpu_binding = dd->work[1].cpu_binding;
4403         dd->work[5].cpu_binding = dd->work[2].cpu_binding;
4404         dd->work[6].cpu_binding = dd->work[2].cpu_binding;
4405         dd->work[7].cpu_binding = dd->work[1].cpu_binding;
4406
4407         /* Log the bindings */
4408         for_each_present_cpu(cpu) {
4409                 memset(cpu_list, 0, sizeof(cpu_list));
4410                 for (i = 0, j = 0; i < MTIP_MAX_SLOT_GROUPS; i++) {
4411                         if (dd->work[i].cpu_binding == cpu) {
4412                                 snprintf(&cpu_list[j], 256 - j, "%d ", i);
4413                                 j = strlen(cpu_list);
4414                         }
4415                 }
4416                 if (j)
4417                         dev_info(&pdev->dev, "CPU %d: WQs %s\n", cpu, cpu_list);
4418         }
4419
4420         INIT_WORK(&dd->work[0].work, mtip_workq_sdbf0);
4421         INIT_WORK(&dd->work[1].work, mtip_workq_sdbf1);
4422         INIT_WORK(&dd->work[2].work, mtip_workq_sdbf2);
4423         INIT_WORK(&dd->work[3].work, mtip_workq_sdbf3);
4424         INIT_WORK(&dd->work[4].work, mtip_workq_sdbf4);
4425         INIT_WORK(&dd->work[5].work, mtip_workq_sdbf5);
4426         INIT_WORK(&dd->work[6].work, mtip_workq_sdbf6);
4427         INIT_WORK(&dd->work[7].work, mtip_workq_sdbf7);
4428
4429         pci_set_master(pdev);
4430         rv = pci_enable_msi(pdev);
4431         if (rv) {
4432                 dev_warn(&pdev->dev,
4433                         "Unable to enable MSI interrupt.\n");
4434                 goto block_initialize_err;
4435         }
4436
4437         /* Initialize the block layer. */
4438         rv = mtip_block_initialize(dd);
4439         if (rv < 0) {
4440                 dev_err(&pdev->dev,
4441                         "Unable to initialize block layer\n");
4442                 goto block_initialize_err;
4443         }
4444
4445         /*
4446          * Increment the instance count so that each device has a unique
4447          * instance number.
4448          */
4449         instance++;
4450         if (rv != MTIP_FTL_REBUILD_MAGIC)
4451                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4452         else
4453                 rv = 0; /* device in rebuild state, return 0 from probe */
4454
4455         /* Add to online list even if in ftl rebuild */
4456         spin_lock_irqsave(&dev_lock, flags);
4457         list_add(&dd->online_list, &online_list);
4458         spin_unlock_irqrestore(&dev_lock, flags);
4459
4460         goto done;
4461
4462 block_initialize_err:
4463         pci_disable_msi(pdev);
4464         if (dd->isr_workq) {
4465                 flush_workqueue(dd->isr_workq);
4466                 destroy_workqueue(dd->isr_workq);
4467                 drop_cpu(dd->work[0].cpu_binding);
4468                 drop_cpu(dd->work[1].cpu_binding);
4469                 drop_cpu(dd->work[2].cpu_binding);
4470         }
4471 setmask_err:
4472         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4473
4474 iomap_err:
4475         kfree(dd);
4476         pci_set_drvdata(pdev, NULL);
4477         return rv;
4478 done:
4479         return rv;
4480 }
4481
4482 /*
4483  * Called for each probed device when the device is removed or the
4484  * driver is unloaded.
4485  *
4486  * return value
4487  *      None
4488  */
4489 static void mtip_pci_remove(struct pci_dev *pdev)
4490 {
4491         struct driver_data *dd = pci_get_drvdata(pdev);
4492         int counter = 0;
4493         unsigned long flags;
4494
4495         set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
4496
4497         spin_lock_irqsave(&dev_lock, flags);
4498         list_del_init(&dd->online_list);
4499         list_add(&dd->remove_list, &removing_list);
4500         spin_unlock_irqrestore(&dev_lock, flags);
4501
4502         if (mtip_check_surprise_removal(pdev)) {
4503                 while (!test_bit(MTIP_DDF_CLEANUP_BIT, &dd->dd_flag)) {
4504                         counter++;
4505                         msleep(20);
4506                         if (counter == 10) {
4507                                 /* Cleanup the outstanding commands */
4508                                 mtip_command_cleanup(dd);
4509                                 break;
4510                         }
4511                 }
4512         }
4513
4514         /* Clean up the block layer. */
4515         mtip_block_remove(dd);
4516
4517         if (dd->isr_workq) {
4518                 flush_workqueue(dd->isr_workq);
4519                 destroy_workqueue(dd->isr_workq);
4520                 drop_cpu(dd->work[0].cpu_binding);
4521                 drop_cpu(dd->work[1].cpu_binding);
4522                 drop_cpu(dd->work[2].cpu_binding);
4523         }
4524
4525         pci_disable_msi(pdev);
4526
4527         spin_lock_irqsave(&dev_lock, flags);
4528         list_del_init(&dd->remove_list);
4529         spin_unlock_irqrestore(&dev_lock, flags);
4530
4531         kfree(dd);
4532         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4533 }
4534
4535 /*
4536  * Called for each probed device when the device is suspended.
4537  *
4538  * return value
4539  *      0  Success
4540  *      <0 Error
4541  */
4542 static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
4543 {
4544         int rv = 0;
4545         struct driver_data *dd = pci_get_drvdata(pdev);
4546
4547         if (!dd) {
4548                 dev_err(&pdev->dev,
4549                         "Driver private datastructure is NULL\n");
4550                 return -EFAULT;
4551         }
4552
4553         set_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4554
4555         /* Disable ports & interrupts then send standby immediate */
4556         rv = mtip_block_suspend(dd);
4557         if (rv < 0) {
4558                 dev_err(&pdev->dev,
4559                         "Failed to suspend controller\n");
4560                 return rv;
4561         }
4562
4563         /*
4564          * Save the pci config space to pdev structure &
4565          * disable the device
4566          */
4567         pci_save_state(pdev);
4568         pci_disable_device(pdev);
4569
4570         /* Move to Low power state*/
4571         pci_set_power_state(pdev, PCI_D3hot);
4572
4573         return rv;
4574 }
4575
4576 /*
4577  * Called for each probed device when the device is resumed.
4578  *
4579  * return value
4580  *      0  Success
4581  *      <0 Error
4582  */
4583 static int mtip_pci_resume(struct pci_dev *pdev)
4584 {
4585         int rv = 0;
4586         struct driver_data *dd;
4587
4588         dd = pci_get_drvdata(pdev);
4589         if (!dd) {
4590                 dev_err(&pdev->dev,
4591                         "Driver private datastructure is NULL\n");
4592                 return -EFAULT;
4593         }
4594
4595         /* Move the device to active State */
4596         pci_set_power_state(pdev, PCI_D0);
4597
4598         /* Restore PCI configuration space */
4599         pci_restore_state(pdev);
4600
4601         /* Enable the PCI device*/
4602         rv = pcim_enable_device(pdev);
4603         if (rv < 0) {
4604                 dev_err(&pdev->dev,
4605                         "Failed to enable card during resume\n");
4606                 goto err;
4607         }
4608         pci_set_master(pdev);
4609
4610         /*
4611          * Calls hbaReset, initPort, & startPort function
4612          * then enables interrupts
4613          */
4614         rv = mtip_block_resume(dd);
4615         if (rv < 0)
4616                 dev_err(&pdev->dev, "Unable to resume\n");
4617
4618 err:
4619         clear_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4620
4621         return rv;
4622 }
4623
4624 /*
4625  * Shutdown routine
4626  *
4627  * return value
4628  *      None
4629  */
4630 static void mtip_pci_shutdown(struct pci_dev *pdev)
4631 {
4632         struct driver_data *dd = pci_get_drvdata(pdev);
4633         if (dd)
4634                 mtip_block_shutdown(dd);
4635 }
4636
4637 /* Table of device ids supported by this driver. */
4638 static DEFINE_PCI_DEVICE_TABLE(mtip_pci_tbl) = {
4639         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320H_DEVICE_ID) },
4640         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320M_DEVICE_ID) },
4641         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320S_DEVICE_ID) },
4642         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P325M_DEVICE_ID) },
4643         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420H_DEVICE_ID) },
4644         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420M_DEVICE_ID) },
4645         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P425M_DEVICE_ID) },
4646         { 0 }
4647 };
4648
4649 /* Structure that describes the PCI driver functions. */
4650 static struct pci_driver mtip_pci_driver = {
4651         .name                   = MTIP_DRV_NAME,
4652         .id_table               = mtip_pci_tbl,
4653         .probe                  = mtip_pci_probe,
4654         .remove                 = mtip_pci_remove,
4655         .suspend                = mtip_pci_suspend,
4656         .resume                 = mtip_pci_resume,
4657         .shutdown               = mtip_pci_shutdown,
4658 };
4659
4660 MODULE_DEVICE_TABLE(pci, mtip_pci_tbl);
4661
4662 /*
4663  * Module initialization function.
4664  *
4665  * Called once when the module is loaded. This function allocates a major
4666  * block device number to the Cyclone devices and registers the PCI layer
4667  * of the driver.
4668  *
4669  * Return value
4670  *      0 on success else error code.
4671  */
4672 static int __init mtip_init(void)
4673 {
4674         int error;
4675
4676         pr_info(MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n");
4677
4678         spin_lock_init(&dev_lock);
4679
4680         INIT_LIST_HEAD(&online_list);
4681         INIT_LIST_HEAD(&removing_list);
4682
4683         /* Allocate a major block device number to use with this driver. */
4684         error = register_blkdev(0, MTIP_DRV_NAME);
4685         if (error <= 0) {
4686                 pr_err("Unable to register block device (%d)\n",
4687                 error);
4688                 return -EBUSY;
4689         }
4690         mtip_major = error;
4691
4692         dfs_parent = debugfs_create_dir("rssd", NULL);
4693         if (IS_ERR_OR_NULL(dfs_parent)) {
4694                 pr_warn("Error creating debugfs parent\n");
4695                 dfs_parent = NULL;
4696         }
4697         if (dfs_parent) {
4698                 dfs_device_status = debugfs_create_file("device_status",
4699                                         S_IRUGO, dfs_parent, NULL,
4700                                         &mtip_device_status_fops);
4701                 if (IS_ERR_OR_NULL(dfs_device_status)) {
4702                         pr_err("Error creating device_status node\n");
4703                         dfs_device_status = NULL;
4704                 }
4705         }
4706
4707         /* Register our PCI operations. */
4708         error = pci_register_driver(&mtip_pci_driver);
4709         if (error) {
4710                 debugfs_remove(dfs_parent);
4711                 unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4712         }
4713
4714         return error;
4715 }
4716
4717 /*
4718  * Module de-initialization function.
4719  *
4720  * Called once when the module is unloaded. This function deallocates
4721  * the major block device number allocated by mtip_init() and
4722  * unregisters the PCI layer of the driver.
4723  *
4724  * Return value
4725  *      none
4726  */
4727 static void __exit mtip_exit(void)
4728 {
4729         debugfs_remove_recursive(dfs_parent);
4730
4731         /* Release the allocated major block device number. */
4732         unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4733
4734         /* Unregister the PCI driver. */
4735         pci_unregister_driver(&mtip_pci_driver);
4736 }
4737
4738 MODULE_AUTHOR("Micron Technology, Inc");
4739 MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
4740 MODULE_LICENSE("GPL");
4741 MODULE_VERSION(MTIP_DRV_VERSION);
4742
4743 module_init(mtip_init);
4744 module_exit(mtip_exit);