kernel/drivers/block/mtip32xx/mtip32xx.c

   1 /*
   2  * Driver for the Micron P320 SSD
   3  *   Copyright (C) 2011 Micron Technology, Inc.
   4  *
   5  * Portions of this code were derived from works subjected to the
   6  * following copyright:
   7  *    Copyright (C) 2009 Integrated Device Technology, Inc.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  */
  20
  21 #include <linux/pci.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/ata.h>
  24 #include <linux/delay.h>
  25 #include <linux/hdreg.h>
  26 #include <linux/uaccess.h>
  27 #include <linux/random.h>
  28 #include <linux/smp.h>
  29 #include <linux/compat.h>
  30 #include <linux/fs.h>
  31 #include <linux/module.h>
  32 #include <linux/genhd.h>
  33 #include <linux/blkdev.h>
  34 #include <linux/blk-mq.h>
  35 #include <linux/bio.h>
  36 #include <linux/dma-mapping.h>
  37 #include <linux/idr.h>
  38 #include <linux/kthread.h>
  39 #include <../drivers/ata/ahci.h>
  40 #include <linux/export.h>
  41 #include <linux/debugfs.h>
  42 #include <linux/prefetch.h>
  43 #include "mtip32xx.h"
  44
  45 #define HW_CMD_SLOT_SZ          (MTIP_MAX_COMMAND_SLOTS * 32)
  46
  47 /* DMA region containing RX Fis, Identify, RLE10, and SMART buffers */
  48 #define AHCI_RX_FIS_SZ          0x100
  49 #define AHCI_RX_FIS_OFFSET      0x0
  50 #define AHCI_IDFY_SZ            ATA_SECT_SIZE
  51 #define AHCI_IDFY_OFFSET        0x400
  52 #define AHCI_SECTBUF_SZ         ATA_SECT_SIZE
  53 #define AHCI_SECTBUF_OFFSET     0x800
  54 #define AHCI_SMARTBUF_SZ        ATA_SECT_SIZE
  55 #define AHCI_SMARTBUF_OFFSET    0xC00
  56 /* 0x100 + 0x200 + 0x200 + 0x200 is smaller than 4k but we pad it out */
  57 #define BLOCK_DMA_ALLOC_SZ      4096
  58
  59 /* DMA region containing command table (should be 8192 bytes) */
  60 #define AHCI_CMD_SLOT_SZ        sizeof(struct mtip_cmd_hdr)
  61 #define AHCI_CMD_TBL_SZ         (MTIP_MAX_COMMAND_SLOTS * AHCI_CMD_SLOT_SZ)
  62 #define AHCI_CMD_TBL_OFFSET     0x0
  63
  64 /* DMA region per command (contains header and SGL) */
  65 #define AHCI_CMD_TBL_HDR_SZ     0x80
  66 #define AHCI_CMD_TBL_HDR_OFFSET 0x0
  67 #define AHCI_CMD_TBL_SGL_SZ     (MTIP_MAX_SG * sizeof(struct mtip_cmd_sg))
  68 #define AHCI_CMD_TBL_SGL_OFFSET AHCI_CMD_TBL_HDR_SZ
  69 #define CMD_DMA_ALLOC_SZ        (AHCI_CMD_TBL_SGL_SZ + AHCI_CMD_TBL_HDR_SZ)
  70
  71
  72 #define HOST_CAP_NZDMA          (1 << 19)
  73 #define HOST_HSORG              0xFC
  74 #define HSORG_DISABLE_SLOTGRP_INTR (1<<24)
  75 #define HSORG_DISABLE_SLOTGRP_PXIS (1<<16)
  76 #define HSORG_HWREV             0xFF00
  77 #define HSORG_STYLE             0x8
  78 #define HSORG_SLOTGROUPS        0x7
  79
  80 #define PORT_COMMAND_ISSUE      0x38
  81 #define PORT_SDBV               0x7C
  82
  83 #define PORT_OFFSET             0x100
  84 #define PORT_MEM_SIZE           0x80
  85
  86 #define PORT_IRQ_ERR \
  87         (PORT_IRQ_HBUS_ERR | PORT_IRQ_IF_ERR | PORT_IRQ_CONNECT | \
  88          PORT_IRQ_PHYRDY | PORT_IRQ_UNK_FIS | PORT_IRQ_BAD_PMP | \
  89          PORT_IRQ_TF_ERR | PORT_IRQ_HBUS_DATA_ERR | PORT_IRQ_IF_NONFATAL | \
  90          PORT_IRQ_OVERFLOW)
  91 #define PORT_IRQ_LEGACY \
  92         (PORT_IRQ_PIOS_FIS | PORT_IRQ_D2H_REG_FIS)
  93 #define PORT_IRQ_HANDLED \
  94         (PORT_IRQ_SDB_FIS | PORT_IRQ_LEGACY | \
  95          PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR | \
  96          PORT_IRQ_CONNECT | PORT_IRQ_PHYRDY)
  97 #define DEF_PORT_IRQ \
  98         (PORT_IRQ_ERR | PORT_IRQ_LEGACY | PORT_IRQ_SDB_FIS)
  99
 100 /* product numbers */
 101 #define MTIP_PRODUCT_UNKNOWN    0x00
 102 #define MTIP_PRODUCT_ASICFPGA   0x11
 103
 104 /* Device instance number, incremented each time a device is probed. */
 105 static int instance;
 106
 107 struct list_head online_list;
 108 struct list_head removing_list;
 109 spinlock_t dev_lock;
 110
 111 /*
 112  * Global variable used to hold the major block device number
 113  * allocated in mtip_init().
 114  */
 115 static int mtip_major;
 116 static struct dentry *dfs_parent;
 117 static struct dentry *dfs_device_status;
 118
 119 static u32 cpu_use[NR_CPUS];
 120
 121 static DEFINE_SPINLOCK(rssd_index_lock);
 122 static DEFINE_IDA(rssd_index_ida);
 123
 124 static int mtip_block_initialize(struct driver_data *dd);
 125
 126 #ifdef CONFIG_COMPAT
 127 struct mtip_compat_ide_task_request_s {
 128         __u8            io_ports[8];
 129         __u8            hob_ports[8];
 130         ide_reg_valid_t out_flags;
 131         ide_reg_valid_t in_flags;
 132         int             data_phase;
 133         int             req_cmd;
 134         compat_ulong_t  out_size;
 135         compat_ulong_t  in_size;
 136 };
 137 #endif
 138
 139 /*
 140  * This function check_for_surprise_removal is called
 141  * while card is removed from the system and it will
 142  * read the vendor id from the configration space
 143  *
 144  * @pdev Pointer to the pci_dev structure.
 145  *
 146  * return value
 147  *       true if device removed, else false
 148  */
 149 static bool mtip_check_surprise_removal(struct pci_dev *pdev)
 150 {
 151         u16 vendor_id = 0;
 152         struct driver_data *dd = pci_get_drvdata(pdev);
 153
 154         if (dd->sr)
 155                 return true;
 156
 157        /* Read the vendorID from the configuration space */
 158         pci_read_config_word(pdev, 0x00, &vendor_id);
 159         if (vendor_id == 0xFFFF) {
 160                 dd->sr = true;
 161                 if (dd->queue)
 162                         set_bit(QUEUE_FLAG_DEAD, &dd->queue->queue_flags);
 163                 else
 164                         dev_warn(&dd->pdev->dev,
 165                                 "%s: dd->queue is NULL\n", __func__);
 166                 return true; /* device removed */
 167         }
 168
 169         return false; /* device present */
 170 }
 171
 172 static struct mtip_cmd *mtip_get_int_command(struct driver_data *dd)
 173 {
 174         struct request *rq;
 175
 176         rq = blk_mq_alloc_request(dd->queue, 0, __GFP_RECLAIM, true);
 177         return blk_mq_rq_to_pdu(rq);
 178 }
 179
 180 static void mtip_put_int_command(struct driver_data *dd, struct mtip_cmd *cmd)
 181 {
 182         blk_put_request(blk_mq_rq_from_pdu(cmd));
 183 }
 184
 185 /*
 186  * Once we add support for one hctx per mtip group, this will change a bit
 187  */
 188 static struct request *mtip_rq_from_tag(struct driver_data *dd,
 189                                         unsigned int tag)
 190 {
 191         struct blk_mq_hw_ctx *hctx = dd->queue->queue_hw_ctx[0];
 192
 193         return blk_mq_tag_to_rq(hctx->tags, tag);
 194 }
 195
 196 static struct mtip_cmd *mtip_cmd_from_tag(struct driver_data *dd,
 197                                           unsigned int tag)
 198 {
 199         struct request *rq = mtip_rq_from_tag(dd, tag);
 200
 201         return blk_mq_rq_to_pdu(rq);
 202 }
 203
 204 /*
 205  * IO completion function.
 206  *
 207  * This completion function is called by the driver ISR when a
 208  * command that was issued by the kernel completes. It first calls the
 209  * asynchronous completion function which normally calls back into the block
 210  * layer passing the asynchronous callback data, then unmaps the
 211  * scatter list associated with the completed command, and finally
 212  * clears the allocated bit associated with the completed command.
 213  *
 214  * @port   Pointer to the port data structure.
 215  * @tag    Tag of the command.
 216  * @data   Pointer to driver_data.
 217  * @status Completion status.
 218  *
 219  * return value
 220  *      None
 221  */
 222 static void mtip_async_complete(struct mtip_port *port,
 223                                 int tag, struct mtip_cmd *cmd, int status)
 224 {
 225         struct driver_data *dd = port->dd;
 226         struct request *rq;
 227
 228         if (unlikely(!dd) || unlikely(!port))
 229                 return;
 230
 231         if (unlikely(status == PORT_IRQ_TF_ERR)) {
 232                 dev_warn(&port->dd->pdev->dev,
 233                         "Command tag %d failed due to TFE\n", tag);
 234         }
 235
 236         /* Unmap the DMA scatter list entries */
 237         dma_unmap_sg(&dd->pdev->dev, cmd->sg, cmd->scatter_ents, cmd->direction);
 238
 239         rq = mtip_rq_from_tag(dd, tag);
 240
 241         if (unlikely(cmd->unaligned))
 242                 up(&port->cmd_slot_unal);
 243
 244         blk_mq_end_request(rq, status ? -EIO : 0);
 245 }
 246
 247 /*
 248  * Reset the HBA (without sleeping)
 249  *
 250  * @dd Pointer to the driver data structure.
 251  *
 252  * return value
 253  *      0       The reset was successful.
 254  *      -1      The HBA Reset bit did not clear.
 255  */
 256 static int mtip_hba_reset(struct driver_data *dd)
 257 {
 258         unsigned long timeout;
 259
 260         /* Set the reset bit */
 261         writel(HOST_RESET, dd->mmio + HOST_CTL);
 262
 263         /* Flush */
 264         readl(dd->mmio + HOST_CTL);
 265
 266         /*
 267          * Spin for up to 10 seconds waiting for reset acknowledgement. Spec
 268          * is 1 sec but in LUN failure conditions, up to 10 secs are required
 269          */
 270         timeout = jiffies + msecs_to_jiffies(10000);
 271         do {
 272                 mdelay(10);
 273                 if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))
 274                         return -1;
 275
 276         } while ((readl(dd->mmio + HOST_CTL) & HOST_RESET)
 277                  && time_before(jiffies, timeout));
 278
 279         if (readl(dd->mmio + HOST_CTL) & HOST_RESET)
 280                 return -1;
 281
 282         return 0;
 283 }
 284
 285 /*
 286  * Issue a command to the hardware.
 287  *
 288  * Set the appropriate bit in the s_active and Command Issue hardware
 289  * registers, causing hardware command processing to begin.
 290  *
 291  * @port Pointer to the port structure.
 292  * @tag  The tag of the command to be issued.
 293  *
 294  * return value
 295  *      None
 296  */
 297 static inline void mtip_issue_ncq_command(struct mtip_port *port, int tag)
 298 {
 299         int group = tag >> 5;
 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
 310 /*
 311  * Enable/disable the reception of FIS
 312  *
 313  * @port   Pointer to the port data structure
 314  * @enable 1 to enable, 0 to disable
 315  *
 316  * return value
 317  *      Previous state: 1 enabled, 0 disabled
 318  */
 319 static int mtip_enable_fis(struct mtip_port *port, int enable)
 320 {
 321         u32 tmp;
 322
 323         /* enable FIS reception */
 324         tmp = readl(port->mmio + PORT_CMD);
 325         if (enable)
 326                 writel(tmp | PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 327         else
 328                 writel(tmp & ~PORT_CMD_FIS_RX, port->mmio + PORT_CMD);
 329
 330         /* Flush */
 331         readl(port->mmio + PORT_CMD);
 332
 333         return (((tmp & PORT_CMD_FIS_RX) == PORT_CMD_FIS_RX));
 334 }
 335
 336 /*
 337  * Enable/disable the DMA engine
 338  *
 339  * @port   Pointer to the port data structure
 340  * @enable 1 to enable, 0 to disable
 341  *
 342  * return value
 343  *      Previous state: 1 enabled, 0 disabled.
 344  */
 345 static int mtip_enable_engine(struct mtip_port *port, int enable)
 346 {
 347         u32 tmp;
 348
 349         /* enable FIS reception */
 350         tmp = readl(port->mmio + PORT_CMD);
 351         if (enable)
 352                 writel(tmp | PORT_CMD_START, port->mmio + PORT_CMD);
 353         else
 354                 writel(tmp & ~PORT_CMD_START, port->mmio + PORT_CMD);
 355
 356         readl(port->mmio + PORT_CMD);
 357         return (((tmp & PORT_CMD_START) == PORT_CMD_START));
 358 }
 359
 360 /*
 361  * Enables the port DMA engine and FIS reception.
 362  *
 363  * return value
 364  *      None
 365  */
 366 static inline void mtip_start_port(struct mtip_port *port)
 367 {
 368         /* Enable FIS reception */
 369         mtip_enable_fis(port, 1);
 370
 371         /* Enable the DMA engine */
 372         mtip_enable_engine(port, 1);
 373 }
 374
 375 /*
 376  * Deinitialize a port by disabling port interrupts, the DMA engine,
 377  * and FIS reception.
 378  *
 379  * @port Pointer to the port structure
 380  *
 381  * return value
 382  *      None
 383  */
 384 static inline void mtip_deinit_port(struct mtip_port *port)
 385 {
 386         /* Disable interrupts on this port */
 387         writel(0, port->mmio + PORT_IRQ_MASK);
 388
 389         /* Disable the DMA engine */
 390         mtip_enable_engine(port, 0);
 391
 392         /* Disable FIS reception */
 393         mtip_enable_fis(port, 0);
 394 }
 395
 396 /*
 397  * Initialize a port.
 398  *
 399  * This function deinitializes the port by calling mtip_deinit_port() and
 400  * then initializes it by setting the command header and RX FIS addresses,
 401  * clearing the SError register and any pending port interrupts before
 402  * re-enabling the default set of port interrupts.
 403  *
 404  * @port Pointer to the port structure.
 405  *
 406  * return value
 407  *      None
 408  */
 409 static void mtip_init_port(struct mtip_port *port)
 410 {
 411         int i;
 412         mtip_deinit_port(port);
 413
 414         /* Program the command list base and FIS base addresses */
 415         if (readl(port->dd->mmio + HOST_CAP) & HOST_CAP_64) {
 416                 writel((port->command_list_dma >> 16) >> 16,
 417                          port->mmio + PORT_LST_ADDR_HI);
 418                 writel((port->rxfis_dma >> 16) >> 16,
 419                          port->mmio + PORT_FIS_ADDR_HI);
 420         }
 421
 422         writel(port->command_list_dma & 0xFFFFFFFF,
 423                         port->mmio + PORT_LST_ADDR);
 424         writel(port->rxfis_dma & 0xFFFFFFFF, port->mmio + PORT_FIS_ADDR);
 425
 426         /* Clear SError */
 427         writel(readl(port->mmio + PORT_SCR_ERR), port->mmio + PORT_SCR_ERR);
 428
 429         /* reset the completed registers.*/
 430         for (i = 0; i < port->dd->slot_groups; i++)
 431                 writel(0xFFFFFFFF, port->completed[i]);
 432
 433         /* Clear any pending interrupts for this port */
 434         writel(readl(port->mmio + PORT_IRQ_STAT), port->mmio + PORT_IRQ_STAT);
 435
 436         /* Clear any pending interrupts on the HBA. */
 437         writel(readl(port->dd->mmio + HOST_IRQ_STAT),
 438                                         port->dd->mmio + HOST_IRQ_STAT);
 439
 440         /* Enable port interrupts */
 441         writel(DEF_PORT_IRQ, port->mmio + PORT_IRQ_MASK);
 442 }
 443
 444 /*
 445  * Restart a port
 446  *
 447  * @port Pointer to the port data structure.
 448  *
 449  * return value
 450  *      None
 451  */
 452 static void mtip_restart_port(struct mtip_port *port)
 453 {
 454         unsigned long timeout;
 455
 456         /* Disable the DMA engine */
 457         mtip_enable_engine(port, 0);
 458
 459         /* Chip quirk: wait up to 500ms for PxCMD.CR == 0 */
 460         timeout = jiffies + msecs_to_jiffies(500);
 461         while ((readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON)
 462                  && time_before(jiffies, timeout))
 463                 ;
 464
 465         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 466                 return;
 467
 468         /*
 469          * Chip quirk: escalate to hba reset if
 470          * PxCMD.CR not clear after 500 ms
 471          */
 472         if (readl(port->mmio + PORT_CMD) & PORT_CMD_LIST_ON) {
 473                 dev_warn(&port->dd->pdev->dev,
 474                         "PxCMD.CR not clear, escalating reset\n");
 475
 476                 if (mtip_hba_reset(port->dd))
 477                         dev_err(&port->dd->pdev->dev,
 478                                 "HBA reset escalation failed.\n");
 479
 480                 /* 30 ms delay before com reset to quiesce chip */
 481                 mdelay(30);
 482         }
 483
 484         dev_warn(&port->dd->pdev->dev, "Issuing COM reset\n");
 485
 486         /* Set PxSCTL.DET */
 487         writel(readl(port->mmio + PORT_SCR_CTL) |
 488                          1, port->mmio + PORT_SCR_CTL);
 489         readl(port->mmio + PORT_SCR_CTL);
 490
 491         /* Wait 1 ms to quiesce chip function */
 492         timeout = jiffies + msecs_to_jiffies(1);
 493         while (time_before(jiffies, timeout))
 494                 ;
 495
 496         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 497                 return;
 498
 499         /* Clear PxSCTL.DET */
 500         writel(readl(port->mmio + PORT_SCR_CTL) & ~1,
 501                          port->mmio + PORT_SCR_CTL);
 502         readl(port->mmio + PORT_SCR_CTL);
 503
 504         /* Wait 500 ms for bit 0 of PORT_SCR_STS to be set */
 505         timeout = jiffies + msecs_to_jiffies(500);
 506         while (((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 507                          && time_before(jiffies, timeout))
 508                 ;
 509
 510         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
 511                 return;
 512
 513         if ((readl(port->mmio + PORT_SCR_STAT) & 0x01) == 0)
 514                 dev_warn(&port->dd->pdev->dev,
 515                         "COM reset failed\n");
 516
 517         mtip_init_port(port);
 518         mtip_start_port(port);
 519
 520 }
 521
 522 static int mtip_device_reset(struct driver_data *dd)
 523 {
 524         int rv = 0;
 525
 526         if (mtip_check_surprise_removal(dd->pdev))
 527                 return 0;
 528
 529         if (mtip_hba_reset(dd) < 0)
 530                 rv = -EFAULT;
 531
 532         mdelay(1);
 533         mtip_init_port(dd->port);
 534         mtip_start_port(dd->port);
 535
 536         /* Enable interrupts on the HBA. */
 537         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
 538                                         dd->mmio + HOST_CTL);
 539         return rv;
 540 }
 541
 542 /*
 543  * Helper function for tag logging
 544  */
 545 static void print_tags(struct driver_data *dd,
 546                         char *msg,
 547                         unsigned long *tagbits,
 548                         int cnt)
 549 {
 550         unsigned char tagmap[128];
 551         int group, tagmap_len = 0;
 552
 553         memset(tagmap, 0, sizeof(tagmap));
 554         for (group = SLOTBITS_IN_LONGS; group > 0; group--)
 555                 tagmap_len += sprintf(tagmap + tagmap_len, "%016lX ",
 556                                                 tagbits[group-1]);
 557         dev_warn(&dd->pdev->dev,
 558                         "%d command(s) %s: tagmap [%s]", cnt, msg, tagmap);
 559 }
 560
 561 /*
 562  * Internal command completion callback function.
 563  *
 564  * This function is normally called by the driver ISR when an internal
 565  * command completed. This function signals the command completion by
 566  * calling complete().
 567  *
 568  * @port   Pointer to the port data structure.
 569  * @tag    Tag of the command that has completed.
 570  * @data   Pointer to a completion structure.
 571  * @status Completion status.
 572  *
 573  * return value
 574  *      None
 575  */
 576 static void mtip_completion(struct mtip_port *port,
 577                             int tag, struct mtip_cmd *command, int status)
 578 {
 579         struct completion *waiting = command->comp_data;
 580         if (unlikely(status == PORT_IRQ_TF_ERR))
 581                 dev_warn(&port->dd->pdev->dev,
 582                         "Internal command %d completed with TFE\n", tag);
 583
 584         complete(waiting);
 585 }
 586
 587 static void mtip_null_completion(struct mtip_port *port,
 588                             int tag, struct mtip_cmd *command, int status)
 589 {
 590 }
 591
 592 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
 593                                 dma_addr_t buffer_dma, unsigned int sectors);
 594 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
 595                                                 struct smart_attr *attrib);
 596 /*
 597  * Handle an error.
 598  *
 599  * @dd Pointer to the DRIVER_DATA structure.
 600  *
 601  * return value
 602  *      None
 603  */
 604 static void mtip_handle_tfe(struct driver_data *dd)
 605 {
 606         int group, tag, bit, reissue, rv;
 607         struct mtip_port *port;
 608         struct mtip_cmd  *cmd;
 609         u32 completed;
 610         struct host_to_dev_fis *fis;
 611         unsigned long tagaccum[SLOTBITS_IN_LONGS];
 612         unsigned int cmd_cnt = 0;
 613         unsigned char *buf;
 614         char *fail_reason = NULL;
 615         int fail_all_ncq_write = 0, fail_all_ncq_cmds = 0;
 616
 617         dev_warn(&dd->pdev->dev, "Taskfile error\n");
 618
 619         port = dd->port;
 620
 621         set_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
 622
 623         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags)) {
 624                 cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 625                 dbg_printk(MTIP_DRV_NAME " TFE for the internal command\n");
 626
 627                 if (cmd->comp_data && cmd->comp_func) {
 628                         cmd->comp_func(port, MTIP_TAG_INTERNAL,
 629                                         cmd, PORT_IRQ_TF_ERR);
 630                 }
 631                 goto handle_tfe_exit;
 632         }
 633
 634         /* clear the tag accumulator */
 635         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 636
 637         /* Loop through all the groups */
 638         for (group = 0; group < dd->slot_groups; group++) {
 639                 completed = readl(port->completed[group]);
 640
 641                 dev_warn(&dd->pdev->dev, "g=%u, comp=%x\n", group, completed);
 642
 643                 /* clear completed status register in the hardware.*/
 644                 writel(completed, port->completed[group]);
 645
 646                 /* Process successfully completed commands */
 647                 for (bit = 0; bit < 32 && completed; bit++) {
 648                         if (!(completed & (1<<bit)))
 649                                 continue;
 650                         tag = (group << 5) + bit;
 651
 652                         /* Skip the internal command slot */
 653                         if (tag == MTIP_TAG_INTERNAL)
 654                                 continue;
 655
 656                         cmd = mtip_cmd_from_tag(dd, tag);
 657                         if (likely(cmd->comp_func)) {
 658                                 set_bit(tag, tagaccum);
 659                                 cmd_cnt++;
 660                                 cmd->comp_func(port, tag, cmd, 0);
 661                         } else {
 662                                 dev_err(&port->dd->pdev->dev,
 663                                         "Missing completion func for tag %d",
 664                                         tag);
 665                                 if (mtip_check_surprise_removal(dd->pdev)) {
 666                                         /* don't proceed further */
 667                                         return;
 668                                 }
 669                         }
 670                 }
 671         }
 672
 673         print_tags(dd, "completed (TFE)", tagaccum, cmd_cnt);
 674
 675         /* Restart the port */
 676         mdelay(20);
 677         mtip_restart_port(port);
 678
 679         /* Trying to determine the cause of the error */
 680         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
 681                                 dd->port->log_buf,
 682                                 dd->port->log_buf_dma, 1);
 683         if (rv) {
 684                 dev_warn(&dd->pdev->dev,
 685                         "Error in READ LOG EXT (10h) command\n");
 686                 /* non-critical error, don't fail the load */
 687         } else {
 688                 buf = (unsigned char *)dd->port->log_buf;
 689                 if (buf[259] & 0x1) {
 690                         dev_info(&dd->pdev->dev,
 691                                 "Write protect bit is set.\n");
 692                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
 693                         fail_all_ncq_write = 1;
 694                         fail_reason = "write protect";
 695                 }
 696                 if (buf[288] == 0xF7) {
 697                         dev_info(&dd->pdev->dev,
 698                                 "Exceeded Tmax, drive in thermal shutdown.\n");
 699                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
 700                         fail_all_ncq_cmds = 1;
 701                         fail_reason = "thermal shutdown";
 702                 }
 703                 if (buf[288] == 0xBF) {
 704                         set_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag);
 705                         dev_info(&dd->pdev->dev,
 706                                 "Drive indicates rebuild has failed. Secure erase required.\n");
 707                         fail_all_ncq_cmds = 1;
 708                         fail_reason = "rebuild failed";
 709                 }
 710         }
 711
 712         /* clear the tag accumulator */
 713         memset(tagaccum, 0, SLOTBITS_IN_LONGS * sizeof(long));
 714
 715         /* Loop through all the groups */
 716         for (group = 0; group < dd->slot_groups; group++) {
 717                 for (bit = 0; bit < 32; bit++) {
 718                         reissue = 1;
 719                         tag = (group << 5) + bit;
 720                         cmd = mtip_cmd_from_tag(dd, tag);
 721
 722                         fis = (struct host_to_dev_fis *)cmd->command;
 723
 724                         /* Should re-issue? */
 725                         if (tag == MTIP_TAG_INTERNAL ||
 726                             fis->command == ATA_CMD_SET_FEATURES)
 727                                 reissue = 0;
 728                         else {
 729                                 if (fail_all_ncq_cmds ||
 730                                         (fail_all_ncq_write &&
 731                                         fis->command == ATA_CMD_FPDMA_WRITE)) {
 732                                         dev_warn(&dd->pdev->dev,
 733                                         "  Fail: %s w/tag %d [%s].\n",
 734                                         fis->command == ATA_CMD_FPDMA_WRITE ?
 735                                                 "write" : "read",
 736                                         tag,
 737                                         fail_reason != NULL ?
 738                                                 fail_reason : "unknown");
 739                                         if (cmd->comp_func) {
 740                                                 cmd->comp_func(port, tag,
 741                                                         cmd, -ENODATA);
 742                                         }
 743                                         continue;
 744                                 }
 745                         }
 746
 747                         /*
 748                          * First check if this command has
 749                          *  exceeded its retries.
 750                          */
 751                         if (reissue && (cmd->retries-- > 0)) {
 752
 753                                 set_bit(tag, tagaccum);
 754
 755                                 /* Re-issue the command. */
 756                                 mtip_issue_ncq_command(port, tag);
 757
 758                                 continue;
 759                         }
 760
 761                         /* Retire a command that will not be reissued */
 762                         dev_warn(&port->dd->pdev->dev,
 763                                 "retiring tag %d\n", tag);
 764
 765                         if (cmd->comp_func)
 766                                 cmd->comp_func(port, tag, cmd, PORT_IRQ_TF_ERR);
 767                         else
 768                                 dev_warn(&port->dd->pdev->dev,
 769                                         "Bad completion for tag %d\n",
 770                                         tag);
 771                 }
 772         }
 773         print_tags(dd, "reissued (TFE)", tagaccum, cmd_cnt);
 774
 775 handle_tfe_exit:
 776         /* clear eh_active */
 777         clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
 778         wake_up_interruptible(&port->svc_wait);
 779 }
 780
 781 /*
 782  * Handle a set device bits interrupt
 783  */
 784 static inline void mtip_workq_sdbfx(struct mtip_port *port, int group,
 785                                                         u32 completed)
 786 {
 787         struct driver_data *dd = port->dd;
 788         int tag, bit;
 789         struct mtip_cmd *command;
 790
 791         if (!completed) {
 792                 WARN_ON_ONCE(!completed);
 793                 return;
 794         }
 795         /* clear completed status register in the hardware.*/
 796         writel(completed, port->completed[group]);
 797
 798         /* Process completed commands. */
 799         for (bit = 0; (bit < 32) && completed; bit++) {
 800                 if (completed & 0x01) {
 801                         tag = (group << 5) | bit;
 802
 803                         /* skip internal command slot. */
 804                         if (unlikely(tag == MTIP_TAG_INTERNAL))
 805                                 continue;
 806
 807                         command = mtip_cmd_from_tag(dd, tag);
 808                         if (likely(command->comp_func))
 809                                 command->comp_func(port, tag, command, 0);
 810                         else {
 811                                 dev_dbg(&dd->pdev->dev,
 812                                         "Null completion for tag %d",
 813                                         tag);
 814
 815                                 if (mtip_check_surprise_removal(
 816                                         dd->pdev)) {
 817                                         return;
 818                                 }
 819                         }
 820                 }
 821                 completed >>= 1;
 822         }
 823
 824         /* If last, re-enable interrupts */
 825         if (atomic_dec_return(&dd->irq_workers_active) == 0)
 826                 writel(0xffffffff, dd->mmio + HOST_IRQ_STAT);
 827 }
 828
 829 /*
 830  * Process legacy pio and d2h interrupts
 831  */
 832 static inline void mtip_process_legacy(struct driver_data *dd, u32 port_stat)
 833 {
 834         struct mtip_port *port = dd->port;
 835         struct mtip_cmd *cmd = mtip_cmd_from_tag(dd, MTIP_TAG_INTERNAL);
 836
 837         if (test_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags) &&
 838             (cmd != NULL) && !(readl(port->cmd_issue[MTIP_TAG_INTERNAL])
 839                 & (1 << MTIP_TAG_INTERNAL))) {
 840                 if (cmd->comp_func) {
 841                         cmd->comp_func(port, MTIP_TAG_INTERNAL, cmd, 0);
 842                         return;
 843                 }
 844         }
 845
 846         return;
 847 }
 848
 849 /*
 850  * Demux and handle errors
 851  */
 852 static inline void mtip_process_errors(struct driver_data *dd, u32 port_stat)
 853 {
 854
 855         if (unlikely(port_stat & PORT_IRQ_CONNECT)) {
 856                 dev_warn(&dd->pdev->dev,
 857                         "Clearing PxSERR.DIAG.x\n");
 858                 writel((1 << 26), dd->port->mmio + PORT_SCR_ERR);
 859         }
 860
 861         if (unlikely(port_stat & PORT_IRQ_PHYRDY)) {
 862                 dev_warn(&dd->pdev->dev,
 863                         "Clearing PxSERR.DIAG.n\n");
 864                 writel((1 << 16), dd->port->mmio + PORT_SCR_ERR);
 865         }
 866
 867         if (unlikely(port_stat & ~PORT_IRQ_HANDLED)) {
 868                 dev_warn(&dd->pdev->dev,
 869                         "Port stat errors %x unhandled\n",
 870                         (port_stat & ~PORT_IRQ_HANDLED));
 871                 if (mtip_check_surprise_removal(dd->pdev))
 872                         return;
 873         }
 874         if (likely(port_stat & (PORT_IRQ_TF_ERR | PORT_IRQ_IF_ERR))) {
 875                 set_bit(MTIP_PF_EH_ACTIVE_BIT, &dd->port->flags);
 876                 wake_up_interruptible(&dd->port->svc_wait);
 877         }
 878 }
 879
 880 static inline irqreturn_t mtip_handle_irq(struct driver_data *data)
 881 {
 882         struct driver_data *dd = (struct driver_data *) data;
 883         struct mtip_port *port = dd->port;
 884         u32 hba_stat, port_stat;
 885         int rv = IRQ_NONE;
 886         int do_irq_enable = 1, i, workers;
 887         struct mtip_work *twork;
 888
 889         hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
 890         if (hba_stat) {
 891                 rv = IRQ_HANDLED;
 892
 893                 /* Acknowledge the interrupt status on the port.*/
 894                 port_stat = readl(port->mmio + PORT_IRQ_STAT);
 895                 if (unlikely(port_stat == 0xFFFFFFFF)) {
 896                         mtip_check_surprise_removal(dd->pdev);
 897                         return IRQ_HANDLED;
 898                 }
 899                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
 900
 901                 /* Demux port status */
 902                 if (likely(port_stat & PORT_IRQ_SDB_FIS)) {
 903                         do_irq_enable = 0;
 904                         WARN_ON_ONCE(atomic_read(&dd->irq_workers_active) != 0);
 905
 906                         /* Start at 1: group zero is always local? */
 907                         for (i = 0, workers = 0; i < MTIP_MAX_SLOT_GROUPS;
 908                                                                         i++) {
 909                                 twork = &dd->work[i];
 910                                 twork->completed = readl(port->completed[i]);
 911                                 if (twork->completed)
 912                                         workers++;
 913                         }
 914
 915                         atomic_set(&dd->irq_workers_active, workers);
 916                         if (workers) {
 917                                 for (i = 1; i < MTIP_MAX_SLOT_GROUPS; i++) {
 918                                         twork = &dd->work[i];
 919                                         if (twork->completed)
 920                                                 queue_work_on(
 921                                                         twork->cpu_binding,
 922                                                         dd->isr_workq,
 923                                                         &twork->work);
 924                                 }
 925
 926                                 if (likely(dd->work[0].completed))
 927                                         mtip_workq_sdbfx(port, 0,
 928                                                         dd->work[0].completed);
 929
 930                         } else {
 931                                 /*
 932                                  * Chip quirk: SDB interrupt but nothing
 933                                  * to complete
 934                                  */
 935                                 do_irq_enable = 1;
 936                         }
 937                 }
 938
 939                 if (unlikely(port_stat & PORT_IRQ_ERR)) {
 940                         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
 941                                 /* don't proceed further */
 942                                 return IRQ_HANDLED;
 943                         }
 944                         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
 945                                                         &dd->dd_flag))
 946                                 return rv;
 947
 948                         mtip_process_errors(dd, port_stat & PORT_IRQ_ERR);
 949                 }
 950
 951                 if (unlikely(port_stat & PORT_IRQ_LEGACY))
 952                         mtip_process_legacy(dd, port_stat & PORT_IRQ_LEGACY);
 953         }
 954
 955         /* acknowledge interrupt */
 956         if (unlikely(do_irq_enable))
 957                 writel(hba_stat, dd->mmio + HOST_IRQ_STAT);
 958
 959         return rv;
 960 }
 961
 962 /*
 963  * HBA interrupt subroutine.
 964  *
 965  * @irq         IRQ number.
 966  * @instance    Pointer to the driver data structure.
 967  *
 968  * return value
 969  *      IRQ_HANDLED     A HBA interrupt was pending and handled.
 970  *      IRQ_NONE        This interrupt was not for the HBA.
 971  */
 972 static irqreturn_t mtip_irq_handler(int irq, void *instance)
 973 {
 974         struct driver_data *dd = instance;
 975
 976         return mtip_handle_irq(dd);
 977 }
 978
 979 static void mtip_issue_non_ncq_command(struct mtip_port *port, int tag)
 980 {
 981         writel(1 << MTIP_TAG_BIT(tag),
 982                 port->cmd_issue[MTIP_TAG_INDEX(tag)]);
 983 }
 984
 985 static bool mtip_pause_ncq(struct mtip_port *port,
 986                                 struct host_to_dev_fis *fis)
 987 {
 988         struct host_to_dev_fis *reply;
 989         unsigned long task_file_data;
 990
 991         reply = port->rxfis + RX_FIS_D2H_REG;
 992         task_file_data = readl(port->mmio+PORT_TFDATA);
 993
 994         if ((task_file_data & 1))
 995                 return false;
 996
 997         if (fis->command == ATA_CMD_SEC_ERASE_PREP) {
 998                 port->ic_pause_timer = jiffies;
 999                 return true;
1000         } else if ((fis->command == ATA_CMD_DOWNLOAD_MICRO) &&
1001                                         (fis->features == 0x03)) {
1002                 set_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1003                 port->ic_pause_timer = jiffies;
1004                 return true;
1005         } else if ((fis->command == ATA_CMD_SEC_ERASE_UNIT) ||
1006                 ((fis->command == 0xFC) &&
1007                         (fis->features == 0x27 || fis->features == 0x72 ||
1008                          fis->features == 0x62 || fis->features == 0x26))) {
1009                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1010                 /* Com reset after secure erase or lowlevel format */
1011                 mtip_restart_port(port);
1012                 clear_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1013                 return false;
1014         }
1015
1016         return false;
1017 }
1018
1019 /*
1020  * Wait for port to quiesce
1021  *
1022  * @port    Pointer to port data structure
1023  * @timeout Max duration to wait (ms)
1024  *
1025  * return value
1026  *      0       Success
1027  *      -EBUSY  Commands still active
1028  */
1029 static int mtip_quiesce_io(struct mtip_port *port, unsigned long timeout)
1030 {
1031         unsigned long to;
1032         unsigned int n;
1033         unsigned int active = 1;
1034
1035         blk_mq_stop_hw_queues(port->dd->queue);
1036
1037         to = jiffies + msecs_to_jiffies(timeout);
1038         do {
1039                 if (test_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags) &&
1040                         test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
1041                         msleep(20);
1042                         continue; /* svc thd is actively issuing commands */
1043                 }
1044
1045                 msleep(100);
1046                 if (mtip_check_surprise_removal(port->dd->pdev))
1047                         goto err_fault;
1048                 if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1049                         goto err_fault;
1050
1051                 /*
1052                  * Ignore s_active bit 0 of array element 0.
1053                  * This bit will always be set
1054                  */
1055                 active = readl(port->s_active[0]) & 0xFFFFFFFE;
1056                 for (n = 1; n < port->dd->slot_groups; n++)
1057                         active |= readl(port->s_active[n]);
1058
1059                 if (!active)
1060                         break;
1061         } while (time_before(jiffies, to));
1062
1063         blk_mq_start_stopped_hw_queues(port->dd->queue, true);
1064         return active ? -EBUSY : 0;
1065 err_fault:
1066         blk_mq_start_stopped_hw_queues(port->dd->queue, true);
1067         return -EFAULT;
1068 }
1069
1070 /*
1071  * Execute an internal command and wait for the completion.
1072  *
1073  * @port    Pointer to the port data structure.
1074  * @fis     Pointer to the FIS that describes the command.
1075  * @fis_len  Length in WORDS of the FIS.
1076  * @buffer  DMA accessible for command data.
1077  * @buf_len  Length, in bytes, of the data buffer.
1078  * @opts    Command header options, excluding the FIS length
1079  *             and the number of PRD entries.
1080  * @timeout Time in ms to wait for the command to complete.
1081  *
1082  * return value
1083  *      0        Command completed successfully.
1084  *      -EFAULT  The buffer address is not correctly aligned.
1085  *      -EBUSY   Internal command or other IO in progress.
1086  *      -EAGAIN  Time out waiting for command to complete.
1087  */
1088 static int mtip_exec_internal_command(struct mtip_port *port,
1089                                         struct host_to_dev_fis *fis,
1090                                         int fis_len,
1091                                         dma_addr_t buffer,
1092                                         int buf_len,
1093                                         u32 opts,
1094                                         gfp_t atomic,
1095                                         unsigned long timeout)
1096 {
1097         struct mtip_cmd_sg *command_sg;
1098         DECLARE_COMPLETION_ONSTACK(wait);
1099         struct mtip_cmd *int_cmd;
1100         struct driver_data *dd = port->dd;
1101         int rv = 0;
1102
1103         /* Make sure the buffer is 8 byte aligned. This is asic specific. */
1104         if (buffer & 0x00000007) {
1105                 dev_err(&dd->pdev->dev, "SG buffer is not 8 byte aligned\n");
1106                 return -EFAULT;
1107         }
1108
1109         int_cmd = mtip_get_int_command(dd);
1110
1111         set_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1112
1113         if (fis->command == ATA_CMD_SEC_ERASE_PREP)
1114                 set_bit(MTIP_PF_SE_ACTIVE_BIT, &port->flags);
1115
1116         clear_bit(MTIP_PF_DM_ACTIVE_BIT, &port->flags);
1117
1118         if (atomic == GFP_KERNEL) {
1119                 if (fis->command != ATA_CMD_STANDBYNOW1) {
1120                         /* wait for io to complete if non atomic */
1121                         if (mtip_quiesce_io(port,
1122                                         MTIP_QUIESCE_IO_TIMEOUT_MS) < 0) {
1123                                 dev_warn(&dd->pdev->dev,
1124                                         "Failed to quiesce IO\n");
1125                                 mtip_put_int_command(dd, int_cmd);
1126                                 clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1127                                 wake_up_interruptible(&port->svc_wait);
1128                                 return -EBUSY;
1129                         }
1130                 }
1131
1132                 /* Set the completion function and data for the command. */
1133                 int_cmd->comp_data = &wait;
1134                 int_cmd->comp_func = mtip_completion;
1135
1136         } else {
1137                 /* Clear completion - we're going to poll */
1138                 int_cmd->comp_data = NULL;
1139                 int_cmd->comp_func = mtip_null_completion;
1140         }
1141
1142         /* Copy the command to the command table */
1143         memcpy(int_cmd->command, fis, fis_len*4);
1144
1145         /* Populate the SG list */
1146         int_cmd->command_header->opts =
1147                  __force_bit2int cpu_to_le32(opts | fis_len);
1148         if (buf_len) {
1149                 command_sg = int_cmd->command + AHCI_CMD_TBL_HDR_SZ;
1150
1151                 command_sg->info =
1152                         __force_bit2int cpu_to_le32((buf_len-1) & 0x3FFFFF);
1153                 command_sg->dba =
1154                         __force_bit2int cpu_to_le32(buffer & 0xFFFFFFFF);
1155                 command_sg->dba_upper =
1156                         __force_bit2int cpu_to_le32((buffer >> 16) >> 16);
1157
1158                 int_cmd->command_header->opts |=
1159                         __force_bit2int cpu_to_le32((1 << 16));
1160         }
1161
1162         /* Populate the command header */
1163         int_cmd->command_header->byte_count = 0;
1164
1165         /* Issue the command to the hardware */
1166         mtip_issue_non_ncq_command(port, MTIP_TAG_INTERNAL);
1167
1168         if (atomic == GFP_KERNEL) {
1169                 /* Wait for the command to complete or timeout. */
1170                 if ((rv = wait_for_completion_interruptible_timeout(
1171                                 &wait,
1172                                 msecs_to_jiffies(timeout))) <= 0) {
1173                         if (rv == -ERESTARTSYS) { /* interrupted */
1174                                 dev_err(&dd->pdev->dev,
1175                                         "Internal command [%02X] was interrupted after %lu ms\n",
1176                                         fis->command, timeout);
1177                                 rv = -EINTR;
1178                                 goto exec_ic_exit;
1179                         } else if (rv == 0) /* timeout */
1180                                 dev_err(&dd->pdev->dev,
1181                                         "Internal command did not complete [%02X] within timeout of  %lu ms\n",
1182                                         fis->command, timeout);
1183                         else
1184                                 dev_err(&dd->pdev->dev,
1185                                         "Internal command [%02X] wait returned code [%d] after %lu ms - unhandled\n",
1186                                         fis->command, rv, timeout);
1187
1188                         if (mtip_check_surprise_removal(dd->pdev) ||
1189                                 test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1190                                                 &dd->dd_flag)) {
1191                                 dev_err(&dd->pdev->dev,
1192                                         "Internal command [%02X] wait returned due to SR\n",
1193                                         fis->command);
1194                                 rv = -ENXIO;
1195                                 goto exec_ic_exit;
1196                         }
1197                         mtip_device_reset(dd); /* recover from timeout issue */
1198                         rv = -EAGAIN;
1199                         goto exec_ic_exit;
1200                 }
1201         } else {
1202                 u32 hba_stat, port_stat;
1203
1204                 /* Spin for <timeout> checking if command still outstanding */
1205                 timeout = jiffies + msecs_to_jiffies(timeout);
1206                 while ((readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1207                                 & (1 << MTIP_TAG_INTERNAL))
1208                                 && time_before(jiffies, timeout)) {
1209                         if (mtip_check_surprise_removal(dd->pdev)) {
1210                                 rv = -ENXIO;
1211                                 goto exec_ic_exit;
1212                         }
1213                         if ((fis->command != ATA_CMD_STANDBYNOW1) &&
1214                                 test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
1215                                                 &dd->dd_flag)) {
1216                                 rv = -ENXIO;
1217                                 goto exec_ic_exit;
1218                         }
1219                         port_stat = readl(port->mmio + PORT_IRQ_STAT);
1220                         if (!port_stat)
1221                                 continue;
1222
1223                         if (port_stat & PORT_IRQ_ERR) {
1224                                 dev_err(&dd->pdev->dev,
1225                                         "Internal command [%02X] failed\n",
1226                                         fis->command);
1227                                 mtip_device_reset(dd);
1228                                 rv = -EIO;
1229                                 goto exec_ic_exit;
1230                         } else {
1231                                 writel(port_stat, port->mmio + PORT_IRQ_STAT);
1232                                 hba_stat = readl(dd->mmio + HOST_IRQ_STAT);
1233                                 if (hba_stat)
1234                                         writel(hba_stat,
1235                                                 dd->mmio + HOST_IRQ_STAT);
1236                         }
1237                         break;
1238                 }
1239         }
1240
1241         if (readl(port->cmd_issue[MTIP_TAG_INTERNAL])
1242                         & (1 << MTIP_TAG_INTERNAL)) {
1243                 rv = -ENXIO;
1244                 if (!test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
1245                         mtip_device_reset(dd);
1246                         rv = -EAGAIN;
1247                 }
1248         }
1249 exec_ic_exit:
1250         /* Clear the allocated and active bits for the internal command. */
1251         mtip_put_int_command(dd, int_cmd);
1252         clear_bit(MTIP_PF_IC_ACTIVE_BIT, &port->flags);
1253         if (rv >= 0 && mtip_pause_ncq(port, fis)) {
1254                 /* NCQ paused */
1255                 return rv;
1256         }
1257         wake_up_interruptible(&port->svc_wait);
1258
1259         return rv;
1260 }
1261
1262 /*
1263  * Byte-swap ATA ID strings.
1264  *
1265  * ATA identify data contains strings in byte-swapped 16-bit words.
1266  * They must be swapped (on all architectures) to be usable as C strings.
1267  * This function swaps bytes in-place.
1268  *
1269  * @buf The buffer location of the string
1270  * @len The number of bytes to swap
1271  *
1272  * return value
1273  *      None
1274  */
1275 static inline void ata_swap_string(u16 *buf, unsigned int len)
1276 {
1277         int i;
1278         for (i = 0; i < (len/2); i++)
1279                 be16_to_cpus(&buf[i]);
1280 }
1281
1282 static void mtip_set_timeout(struct driver_data *dd,
1283                                         struct host_to_dev_fis *fis,
1284                                         unsigned int *timeout, u8 erasemode)
1285 {
1286         switch (fis->command) {
1287         case ATA_CMD_DOWNLOAD_MICRO:
1288                 *timeout = 120000; /* 2 minutes */
1289                 break;
1290         case ATA_CMD_SEC_ERASE_UNIT:
1291         case 0xFC:
1292                 if (erasemode)
1293                         *timeout = ((*(dd->port->identify + 90) * 2) * 60000);
1294                 else
1295                         *timeout = ((*(dd->port->identify + 89) * 2) * 60000);
1296                 break;
1297         case ATA_CMD_STANDBYNOW1:
1298                 *timeout = 120000;  /* 2 minutes */
1299                 break;
1300         case 0xF7:
1301         case 0xFA:
1302                 *timeout = 60000;  /* 60 seconds */
1303                 break;
1304         case ATA_CMD_SMART:
1305                 *timeout = 15000;  /* 15 seconds */
1306                 break;
1307         default:
1308                 *timeout = MTIP_IOCTL_CMD_TIMEOUT_MS;
1309                 break;
1310         }
1311 }
1312
1313 /*
1314  * Request the device identity information.
1315  *
1316  * If a user space buffer is not specified, i.e. is NULL, the
1317  * identify information is still read from the drive and placed
1318  * into the identify data buffer (@e port->identify) in the
1319  * port data structure.
1320  * When the identify buffer contains valid identify information @e
1321  * port->identify_valid is non-zero.
1322  *
1323  * @port         Pointer to the port structure.
1324  * @user_buffer  A user space buffer where the identify data should be
1325  *                    copied.
1326  *
1327  * return value
1328  *      0       Command completed successfully.
1329  *      -EFAULT An error occurred while coping data to the user buffer.
1330  *      -1      Command failed.
1331  */
1332 static int mtip_get_identify(struct mtip_port *port, void __user *user_buffer)
1333 {
1334         int rv = 0;
1335         struct host_to_dev_fis fis;
1336
1337         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &port->dd->dd_flag))
1338                 return -EFAULT;
1339
1340         /* Build the FIS. */
1341         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1342         fis.type        = 0x27;
1343         fis.opts        = 1 << 7;
1344         fis.command     = ATA_CMD_ID_ATA;
1345
1346         /* Set the identify information as invalid. */
1347         port->identify_valid = 0;
1348
1349         /* Clear the identify information. */
1350         memset(port->identify, 0, sizeof(u16) * ATA_ID_WORDS);
1351
1352         /* Execute the command. */
1353         if (mtip_exec_internal_command(port,
1354                                 &fis,
1355                                 5,
1356                                 port->identify_dma,
1357                                 sizeof(u16) * ATA_ID_WORDS,
1358                                 0,
1359                                 GFP_KERNEL,
1360                                 MTIP_INT_CMD_TIMEOUT_MS)
1361                                 < 0) {
1362                 rv = -1;
1363                 goto out;
1364         }
1365
1366         /*
1367          * Perform any necessary byte-swapping.  Yes, the kernel does in fact
1368          * perform field-sensitive swapping on the string fields.
1369          * See the kernel use of ata_id_string() for proof of this.
1370          */
1371 #ifdef __LITTLE_ENDIAN
1372         ata_swap_string(port->identify + 27, 40);  /* model string*/
1373         ata_swap_string(port->identify + 23, 8);   /* firmware string*/
1374         ata_swap_string(port->identify + 10, 20);  /* serial# string*/
1375 #else
1376         {
1377                 int i;
1378                 for (i = 0; i < ATA_ID_WORDS; i++)
1379                         port->identify[i] = le16_to_cpu(port->identify[i]);
1380         }
1381 #endif
1382
1383         /* Check security locked state */
1384         if (port->identify[128] & 0x4)
1385                 set_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1386         else
1387                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &port->dd->dd_flag);
1388
1389 #ifdef MTIP_TRIM /* Disabling TRIM support temporarily */
1390         /* Demux ID.DRAT & ID.RZAT to determine trim support */
1391         if (port->identify[69] & (1 << 14) && port->identify[69] & (1 << 5))
1392                 port->dd->trim_supp = true;
1393         else
1394 #endif
1395                 port->dd->trim_supp = false;
1396
1397         /* Set the identify buffer as valid. */
1398         port->identify_valid = 1;
1399
1400         if (user_buffer) {
1401                 if (copy_to_user(
1402                         user_buffer,
1403                         port->identify,
1404                         ATA_ID_WORDS * sizeof(u16))) {
1405                         rv = -EFAULT;
1406                         goto out;
1407                 }
1408         }
1409
1410 out:
1411         return rv;
1412 }
1413
1414 /*
1415  * Issue a standby immediate command to the device.
1416  *
1417  * @port Pointer to the port structure.
1418  *
1419  * return value
1420  *      0       Command was executed successfully.
1421  *      -1      An error occurred while executing the command.
1422  */
1423 static int mtip_standby_immediate(struct mtip_port *port)
1424 {
1425         int rv;
1426         struct host_to_dev_fis  fis;
1427         unsigned long start;
1428         unsigned int timeout;
1429
1430         /* Build the FIS. */
1431         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1432         fis.type        = 0x27;
1433         fis.opts        = 1 << 7;
1434         fis.command     = ATA_CMD_STANDBYNOW1;
1435
1436         mtip_set_timeout(port->dd, &fis, &timeout, 0);
1437
1438         start = jiffies;
1439         rv = mtip_exec_internal_command(port,
1440                                         &fis,
1441                                         5,
1442                                         0,
1443                                         0,
1444                                         0,
1445                                         GFP_ATOMIC,
1446                                         timeout);
1447         dbg_printk(MTIP_DRV_NAME "Time taken to complete standby cmd: %d ms\n",
1448                         jiffies_to_msecs(jiffies - start));
1449         if (rv)
1450                 dev_warn(&port->dd->pdev->dev,
1451                         "STANDBY IMMEDIATE command failed.\n");
1452
1453         return rv;
1454 }
1455
1456 /*
1457  * Issue a READ LOG EXT command to the device.
1458  *
1459  * @port        pointer to the port structure.
1460  * @page        page number to fetch
1461  * @buffer      pointer to buffer
1462  * @buffer_dma  dma address corresponding to @buffer
1463  * @sectors     page length to fetch, in sectors
1464  *
1465  * return value
1466  *      @rv     return value from mtip_exec_internal_command()
1467  */
1468 static int mtip_read_log_page(struct mtip_port *port, u8 page, u16 *buffer,
1469                                 dma_addr_t buffer_dma, unsigned int sectors)
1470 {
1471         struct host_to_dev_fis fis;
1472
1473         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1474         fis.type        = 0x27;
1475         fis.opts        = 1 << 7;
1476         fis.command     = ATA_CMD_READ_LOG_EXT;
1477         fis.sect_count  = sectors & 0xFF;
1478         fis.sect_cnt_ex = (sectors >> 8) & 0xFF;
1479         fis.lba_low     = page;
1480         fis.lba_mid     = 0;
1481         fis.device      = ATA_DEVICE_OBS;
1482
1483         memset(buffer, 0, sectors * ATA_SECT_SIZE);
1484
1485         return mtip_exec_internal_command(port,
1486                                         &fis,
1487                                         5,
1488                                         buffer_dma,
1489                                         sectors * ATA_SECT_SIZE,
1490                                         0,
1491                                         GFP_ATOMIC,
1492                                         MTIP_INT_CMD_TIMEOUT_MS);
1493 }
1494
1495 /*
1496  * Issue a SMART READ DATA command to the device.
1497  *
1498  * @port        pointer to the port structure.
1499  * @buffer      pointer to buffer
1500  * @buffer_dma  dma address corresponding to @buffer
1501  *
1502  * return value
1503  *      @rv     return value from mtip_exec_internal_command()
1504  */
1505 static int mtip_get_smart_data(struct mtip_port *port, u8 *buffer,
1506                                         dma_addr_t buffer_dma)
1507 {
1508         struct host_to_dev_fis fis;
1509
1510         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1511         fis.type        = 0x27;
1512         fis.opts        = 1 << 7;
1513         fis.command     = ATA_CMD_SMART;
1514         fis.features    = 0xD0;
1515         fis.sect_count  = 1;
1516         fis.lba_mid     = 0x4F;
1517         fis.lba_hi      = 0xC2;
1518         fis.device      = ATA_DEVICE_OBS;
1519
1520         return mtip_exec_internal_command(port,
1521                                         &fis,
1522                                         5,
1523                                         buffer_dma,
1524                                         ATA_SECT_SIZE,
1525                                         0,
1526                                         GFP_ATOMIC,
1527                                         15000);
1528 }
1529
1530 /*
1531  * Get the value of a smart attribute
1532  *
1533  * @port        pointer to the port structure
1534  * @id          attribute number
1535  * @attrib      pointer to return attrib information corresponding to @id
1536  *
1537  * return value
1538  *      -EINVAL NULL buffer passed or unsupported attribute @id.
1539  *      -EPERM  Identify data not valid, SMART not supported or not enabled
1540  */
1541 static int mtip_get_smart_attr(struct mtip_port *port, unsigned int id,
1542                                                 struct smart_attr *attrib)
1543 {
1544         int rv, i;
1545         struct smart_attr *pattr;
1546
1547         if (!attrib)
1548                 return -EINVAL;
1549
1550         if (!port->identify_valid) {
1551                 dev_warn(&port->dd->pdev->dev, "IDENTIFY DATA not valid\n");
1552                 return -EPERM;
1553         }
1554         if (!(port->identify[82] & 0x1)) {
1555                 dev_warn(&port->dd->pdev->dev, "SMART not supported\n");
1556                 return -EPERM;
1557         }
1558         if (!(port->identify[85] & 0x1)) {
1559                 dev_warn(&port->dd->pdev->dev, "SMART not enabled\n");
1560                 return -EPERM;
1561         }
1562
1563         memset(port->smart_buf, 0, ATA_SECT_SIZE);
1564         rv = mtip_get_smart_data(port, port->smart_buf, port->smart_buf_dma);
1565         if (rv) {
1566                 dev_warn(&port->dd->pdev->dev, "Failed to ge SMART data\n");
1567                 return rv;
1568         }
1569
1570         pattr = (struct smart_attr *)(port->smart_buf + 2);
1571         for (i = 0; i < 29; i++, pattr++)
1572                 if (pattr->attr_id == id) {
1573                         memcpy(attrib, pattr, sizeof(struct smart_attr));
1574                         break;
1575                 }
1576
1577         if (i == 29) {
1578                 dev_warn(&port->dd->pdev->dev,
1579                         "Query for invalid SMART attribute ID\n");
1580                 rv = -EINVAL;
1581         }
1582
1583         return rv;
1584 }
1585
1586 /*
1587  * Trim unused sectors
1588  *
1589  * @dd          pointer to driver_data structure
1590  * @lba         starting lba
1591  * @len         # of 512b sectors to trim
1592  *
1593  * return value
1594  *      -ENOMEM         Out of dma memory
1595  *      -EINVAL         Invalid parameters passed in, trim not supported
1596  *      -EIO            Error submitting trim request to hw
1597  */
1598 static int mtip_send_trim(struct driver_data *dd, unsigned int lba,
1599                                 unsigned int len)
1600 {
1601         int i, rv = 0;
1602         u64 tlba, tlen, sect_left;
1603         struct mtip_trim_entry *buf;
1604         dma_addr_t dma_addr;
1605         struct host_to_dev_fis fis;
1606
1607         if (!len || dd->trim_supp == false)
1608                 return -EINVAL;
1609
1610         /* Trim request too big */
1611         WARN_ON(len > (MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES));
1612
1613         /* Trim request not aligned on 4k boundary */
1614         WARN_ON(len % 8 != 0);
1615
1616         /* Warn if vu_trim structure is too big */
1617         WARN_ON(sizeof(struct mtip_trim) > ATA_SECT_SIZE);
1618
1619         /* Allocate a DMA buffer for the trim structure */
1620         buf = dmam_alloc_coherent(&dd->pdev->dev, ATA_SECT_SIZE, &dma_addr,
1621                                                                 GFP_KERNEL);
1622         if (!buf)
1623                 return -ENOMEM;
1624         memset(buf, 0, ATA_SECT_SIZE);
1625
1626         for (i = 0, sect_left = len, tlba = lba;
1627                         i < MTIP_MAX_TRIM_ENTRIES && sect_left;
1628                         i++) {
1629                 tlen = (sect_left >= MTIP_MAX_TRIM_ENTRY_LEN ?
1630                                         MTIP_MAX_TRIM_ENTRY_LEN :
1631                                         sect_left);
1632                 buf[i].lba = __force_bit2int cpu_to_le32(tlba);
1633                 buf[i].range = __force_bit2int cpu_to_le16(tlen);
1634                 tlba += tlen;
1635                 sect_left -= tlen;
1636         }
1637         WARN_ON(sect_left != 0);
1638
1639         /* Build the fis */
1640         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1641         fis.type       = 0x27;
1642         fis.opts       = 1 << 7;
1643         fis.command    = 0xfb;
1644         fis.features   = 0x60;
1645         fis.sect_count = 1;
1646         fis.device     = ATA_DEVICE_OBS;
1647
1648         if (mtip_exec_internal_command(dd->port,
1649                                         &fis,
1650                                         5,
1651                                         dma_addr,
1652                                         ATA_SECT_SIZE,
1653                                         0,
1654                                         GFP_KERNEL,
1655                                         MTIP_TRIM_TIMEOUT_MS) < 0)
1656                 rv = -EIO;
1657
1658         dmam_free_coherent(&dd->pdev->dev, ATA_SECT_SIZE, buf, dma_addr);
1659         return rv;
1660 }
1661
1662 /*
1663  * Get the drive capacity.
1664  *
1665  * @dd      Pointer to the device data structure.
1666  * @sectors Pointer to the variable that will receive the sector count.
1667  *
1668  * return value
1669  *      1 Capacity was returned successfully.
1670  *      0 The identify information is invalid.
1671  */
1672 static bool mtip_hw_get_capacity(struct driver_data *dd, sector_t *sectors)
1673 {
1674         struct mtip_port *port = dd->port;
1675         u64 total, raw0, raw1, raw2, raw3;
1676         raw0 = port->identify[100];
1677         raw1 = port->identify[101];
1678         raw2 = port->identify[102];
1679         raw3 = port->identify[103];
1680         total = raw0 | raw1<<16 | raw2<<32 | raw3<<48;
1681         *sectors = total;
1682         return (bool) !!port->identify_valid;
1683 }
1684
1685 /*
1686  * Display the identify command data.
1687  *
1688  * @port Pointer to the port data structure.
1689  *
1690  * return value
1691  *      None
1692  */
1693 static void mtip_dump_identify(struct mtip_port *port)
1694 {
1695         sector_t sectors;
1696         unsigned short revid;
1697         char cbuf[42];
1698
1699         if (!port->identify_valid)
1700                 return;
1701
1702         strlcpy(cbuf, (char *)(port->identify+10), 21);
1703         dev_info(&port->dd->pdev->dev,
1704                 "Serial No.: %s\n", cbuf);
1705
1706         strlcpy(cbuf, (char *)(port->identify+23), 9);
1707         dev_info(&port->dd->pdev->dev,
1708                 "Firmware Ver.: %s\n", cbuf);
1709
1710         strlcpy(cbuf, (char *)(port->identify+27), 41);
1711         dev_info(&port->dd->pdev->dev, "Model: %s\n", cbuf);
1712
1713         dev_info(&port->dd->pdev->dev, "Security: %04x %s\n",
1714                 port->identify[128],
1715                 port->identify[128] & 0x4 ? "(LOCKED)" : "");
1716
1717         if (mtip_hw_get_capacity(port->dd, &sectors))
1718                 dev_info(&port->dd->pdev->dev,
1719                         "Capacity: %llu sectors (%llu MB)\n",
1720                          (u64)sectors,
1721                          ((u64)sectors) * ATA_SECT_SIZE >> 20);
1722
1723         pci_read_config_word(port->dd->pdev, PCI_REVISION_ID, &revid);
1724         switch (revid & 0xFF) {
1725         case 0x1:
1726                 strlcpy(cbuf, "A0", 3);
1727                 break;
1728         case 0x3:
1729                 strlcpy(cbuf, "A2", 3);
1730                 break;
1731         default:
1732                 strlcpy(cbuf, "?", 2);
1733                 break;
1734         }
1735         dev_info(&port->dd->pdev->dev,
1736                 "Card Type: %s\n", cbuf);
1737 }
1738
1739 /*
1740  * Map the commands scatter list into the command table.
1741  *
1742  * @command Pointer to the command.
1743  * @nents Number of scatter list entries.
1744  *
1745  * return value
1746  *      None
1747  */
1748 static inline void fill_command_sg(struct driver_data *dd,
1749                                 struct mtip_cmd *command,
1750                                 int nents)
1751 {
1752         int n;
1753         unsigned int dma_len;
1754         struct mtip_cmd_sg *command_sg;
1755         struct scatterlist *sg = command->sg;
1756
1757         command_sg = command->command + AHCI_CMD_TBL_HDR_SZ;
1758
1759         for (n = 0; n < nents; n++) {
1760                 dma_len = sg_dma_len(sg);
1761                 if (dma_len > 0x400000)
1762                         dev_err(&dd->pdev->dev,
1763                                 "DMA segment length truncated\n");
1764                 command_sg->info = __force_bit2int
1765                         cpu_to_le32((dma_len-1) & 0x3FFFFF);
1766                 command_sg->dba = __force_bit2int
1767                         cpu_to_le32(sg_dma_address(sg));
1768                 command_sg->dba_upper = __force_bit2int
1769                         cpu_to_le32((sg_dma_address(sg) >> 16) >> 16);
1770                 command_sg++;
1771                 sg++;
1772         }
1773 }
1774
1775 /*
1776  * @brief Execute a drive command.
1777  *
1778  * return value 0 The command completed successfully.
1779  * return value -1 An error occurred while executing the command.
1780  */
1781 static int exec_drive_task(struct mtip_port *port, u8 *command)
1782 {
1783         struct host_to_dev_fis  fis;
1784         struct host_to_dev_fis *reply = (port->rxfis + RX_FIS_D2H_REG);
1785         unsigned int to;
1786
1787         /* Build the FIS. */
1788         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1789         fis.type        = 0x27;
1790         fis.opts        = 1 << 7;
1791         fis.command     = command[0];
1792         fis.features    = command[1];
1793         fis.sect_count  = command[2];
1794         fis.sector      = command[3];
1795         fis.cyl_low     = command[4];
1796         fis.cyl_hi      = command[5];
1797         fis.device      = command[6] & ~0x10; /* Clear the dev bit*/
1798
1799         mtip_set_timeout(port->dd, &fis, &to, 0);
1800
1801         dbg_printk(MTIP_DRV_NAME " %s: User Command: cmd %x, feat %x, nsect %x, sect %x, lcyl %x, hcyl %x, sel %x\n",
1802                 __func__,
1803                 command[0],
1804                 command[1],
1805                 command[2],
1806                 command[3],
1807                 command[4],
1808                 command[5],
1809                 command[6]);
1810
1811         /* Execute the command. */
1812         if (mtip_exec_internal_command(port,
1813                                  &fis,
1814                                  5,
1815                                  0,
1816                                  0,
1817                                  0,
1818                                  GFP_KERNEL,
1819                                  to) < 0) {
1820                 return -1;
1821         }
1822
1823         command[0] = reply->command; /* Status*/
1824         command[1] = reply->features; /* Error*/
1825         command[4] = reply->cyl_low;
1826         command[5] = reply->cyl_hi;
1827
1828         dbg_printk(MTIP_DRV_NAME " %s: Completion Status: stat %x, err %x , cyl_lo %x cyl_hi %x\n",
1829                 __func__,
1830                 command[0],
1831                 command[1],
1832                 command[4],
1833                 command[5]);
1834
1835         return 0;
1836 }
1837
1838 /*
1839  * @brief Execute a drive command.
1840  *
1841  * @param port Pointer to the port data structure.
1842  * @param command Pointer to the user specified command parameters.
1843  * @param user_buffer Pointer to the user space buffer where read sector
1844  *                   data should be copied.
1845  *
1846  * return value 0 The command completed successfully.
1847  * return value -EFAULT An error occurred while copying the completion
1848  *                 data to the user space buffer.
1849  * return value -1 An error occurred while executing the command.
1850  */
1851 static int exec_drive_command(struct mtip_port *port, u8 *command,
1852                                 void __user *user_buffer)
1853 {
1854         struct host_to_dev_fis  fis;
1855         struct host_to_dev_fis *reply;
1856         u8 *buf = NULL;
1857         dma_addr_t dma_addr = 0;
1858         int rv = 0, xfer_sz = command[3];
1859         unsigned int to;
1860
1861         if (xfer_sz) {
1862                 if (!user_buffer)
1863                         return -EFAULT;
1864
1865                 buf = dmam_alloc_coherent(&port->dd->pdev->dev,
1866                                 ATA_SECT_SIZE * xfer_sz,
1867                                 &dma_addr,
1868                                 GFP_KERNEL);
1869                 if (!buf) {
1870                         dev_err(&port->dd->pdev->dev,
1871                                 "Memory allocation failed (%d bytes)\n",
1872                                 ATA_SECT_SIZE * xfer_sz);
1873                         return -ENOMEM;
1874                 }
1875                 memset(buf, 0, ATA_SECT_SIZE * xfer_sz);
1876         }
1877
1878         /* Build the FIS. */
1879         memset(&fis, 0, sizeof(struct host_to_dev_fis));
1880         fis.type        = 0x27;
1881         fis.opts        = 1 << 7;
1882         fis.command     = command[0];
1883         fis.features    = command[2];
1884         fis.sect_count  = command[3];
1885         if (fis.command == ATA_CMD_SMART) {
1886                 fis.sector      = command[1];
1887                 fis.cyl_low     = 0x4F;
1888                 fis.cyl_hi      = 0xC2;
1889         }
1890
1891         mtip_set_timeout(port->dd, &fis, &to, 0);
1892
1893         if (xfer_sz)
1894                 reply = (port->rxfis + RX_FIS_PIO_SETUP);
1895         else
1896                 reply = (port->rxfis + RX_FIS_D2H_REG);
1897
1898         dbg_printk(MTIP_DRV_NAME
1899                 " %s: User Command: cmd %x, sect %x, "
1900                 "feat %x, sectcnt %x\n",
1901                 __func__,
1902                 command[0],
1903                 command[1],
1904                 command[2],
1905                 command[3]);
1906
1907         /* Execute the command. */
1908         if (mtip_exec_internal_command(port,
1909                                 &fis,
1910                                  5,
1911                                  (xfer_sz ? dma_addr : 0),
1912                                  (xfer_sz ? ATA_SECT_SIZE * xfer_sz : 0),
1913                                  0,
1914                                  GFP_KERNEL,
1915                                  to)
1916                                  < 0) {
1917                 rv = -EFAULT;
1918                 goto exit_drive_command;
1919         }
1920
1921         /* Collect the completion status. */
1922         command[0] = reply->command; /* Status*/
1923         command[1] = reply->features; /* Error*/
1924         command[2] = reply->sect_count;
1925
1926         dbg_printk(MTIP_DRV_NAME
1927                 " %s: Completion Status: stat %x, "
1928                 "err %x, nsect %x\n",
1929                 __func__,
1930                 command[0],
1931                 command[1],
1932                 command[2]);
1933
1934         if (xfer_sz) {
1935                 if (copy_to_user(user_buffer,
1936                                  buf,
1937                                  ATA_SECT_SIZE * command[3])) {
1938                         rv = -EFAULT;
1939                         goto exit_drive_command;
1940                 }
1941         }
1942 exit_drive_command:
1943         if (buf)
1944                 dmam_free_coherent(&port->dd->pdev->dev,
1945                                 ATA_SECT_SIZE * xfer_sz, buf, dma_addr);
1946         return rv;
1947 }
1948
1949 /*
1950  *  Indicates whether a command has a single sector payload.
1951  *
1952  *  @command passed to the device to perform the certain event.
1953  *  @features passed to the device to perform the certain event.
1954  *
1955  *  return value
1956  *      1       command is one that always has a single sector payload,
1957  *              regardless of the value in the Sector Count field.
1958  *      0       otherwise
1959  *
1960  */
1961 static unsigned int implicit_sector(unsigned char command,
1962                                     unsigned char features)
1963 {
1964         unsigned int rv = 0;
1965
1966         /* list of commands that have an implicit sector count of 1 */
1967         switch (command) {
1968         case ATA_CMD_SEC_SET_PASS:
1969         case ATA_CMD_SEC_UNLOCK:
1970         case ATA_CMD_SEC_ERASE_PREP:
1971         case ATA_CMD_SEC_ERASE_UNIT:
1972         case ATA_CMD_SEC_FREEZE_LOCK:
1973         case ATA_CMD_SEC_DISABLE_PASS:
1974         case ATA_CMD_PMP_READ:
1975         case ATA_CMD_PMP_WRITE:
1976                 rv = 1;
1977                 break;
1978         case ATA_CMD_SET_MAX:
1979                 if (features == ATA_SET_MAX_UNLOCK)
1980                         rv = 1;
1981                 break;
1982         case ATA_CMD_SMART:
1983                 if ((features == ATA_SMART_READ_VALUES) ||
1984                                 (features == ATA_SMART_READ_THRESHOLDS))
1985                         rv = 1;
1986                 break;
1987         case ATA_CMD_CONF_OVERLAY:
1988                 if ((features == ATA_DCO_IDENTIFY) ||
1989                                 (features == ATA_DCO_SET))
1990                         rv = 1;
1991                 break;
1992         }
1993         return rv;
1994 }
1995
1996 /*
1997  * Executes a taskfile
1998  * See ide_taskfile_ioctl() for derivation
1999  */
2000 static int exec_drive_taskfile(struct driver_data *dd,
2001                                void __user *buf,
2002                                ide_task_request_t *req_task,
2003                                int outtotal)
2004 {
2005         struct host_to_dev_fis  fis;
2006         struct host_to_dev_fis *reply;
2007         u8 *outbuf = NULL;
2008         u8 *inbuf = NULL;
2009         dma_addr_t outbuf_dma = 0;
2010         dma_addr_t inbuf_dma = 0;
2011         dma_addr_t dma_buffer = 0;
2012         int err = 0;
2013         unsigned int taskin = 0;
2014         unsigned int taskout = 0;
2015         u8 nsect = 0;
2016         unsigned int timeout;
2017         unsigned int force_single_sector;
2018         unsigned int transfer_size;
2019         unsigned long task_file_data;
2020         int intotal = outtotal + req_task->out_size;
2021         int erasemode = 0;
2022
2023         taskout = req_task->out_size;
2024         taskin = req_task->in_size;
2025         /* 130560 = 512 * 0xFF*/
2026         if (taskin > 130560 || taskout > 130560) {
2027                 err = -EINVAL;
2028                 goto abort;
2029         }
2030
2031         if (taskout) {
2032                 outbuf = kzalloc(taskout, GFP_KERNEL);
2033                 if (outbuf == NULL) {
2034                         err = -ENOMEM;
2035                         goto abort;
2036                 }
2037                 if (copy_from_user(outbuf, buf + outtotal, taskout)) {
2038                         err = -EFAULT;
2039                         goto abort;
2040                 }
2041                 outbuf_dma = pci_map_single(dd->pdev,
2042                                          outbuf,
2043                                          taskout,
2044                                          DMA_TO_DEVICE);
2045                 if (outbuf_dma == 0) {
2046                         err = -ENOMEM;
2047                         goto abort;
2048                 }
2049                 dma_buffer = outbuf_dma;
2050         }
2051
2052         if (taskin) {
2053                 inbuf = kzalloc(taskin, GFP_KERNEL);
2054                 if (inbuf == NULL) {
2055                         err = -ENOMEM;
2056                         goto abort;
2057                 }
2058
2059                 if (copy_from_user(inbuf, buf + intotal, taskin)) {
2060                         err = -EFAULT;
2061                         goto abort;
2062                 }
2063                 inbuf_dma = pci_map_single(dd->pdev,
2064                                          inbuf,
2065                                          taskin, DMA_FROM_DEVICE);
2066                 if (inbuf_dma == 0) {
2067                         err = -ENOMEM;
2068                         goto abort;
2069                 }
2070                 dma_buffer = inbuf_dma;
2071         }
2072
2073         /* only supports PIO and non-data commands from this ioctl. */
2074         switch (req_task->data_phase) {
2075         case TASKFILE_OUT:
2076                 nsect = taskout / ATA_SECT_SIZE;
2077                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
2078                 break;
2079         case TASKFILE_IN:
2080                 reply = (dd->port->rxfis + RX_FIS_PIO_SETUP);
2081                 break;
2082         case TASKFILE_NO_DATA:
2083                 reply = (dd->port->rxfis + RX_FIS_D2H_REG);
2084                 break;
2085         default:
2086                 err = -EINVAL;
2087                 goto abort;
2088         }
2089
2090         /* Build the FIS. */
2091         memset(&fis, 0, sizeof(struct host_to_dev_fis));
2092
2093         fis.type        = 0x27;
2094         fis.opts        = 1 << 7;
2095         fis.command     = req_task->io_ports[7];
2096         fis.features    = req_task->io_ports[1];
2097         fis.sect_count  = req_task->io_ports[2];
2098         fis.lba_low     = req_task->io_ports[3];
2099         fis.lba_mid     = req_task->io_ports[4];
2100         fis.lba_hi      = req_task->io_ports[5];
2101          /* Clear the dev bit*/
2102         fis.device      = req_task->io_ports[6] & ~0x10;
2103
2104         if ((req_task->in_flags.all == 0) && (req_task->out_flags.all & 1)) {
2105                 req_task->in_flags.all  =
2106                         IDE_TASKFILE_STD_IN_FLAGS |
2107                         (IDE_HOB_STD_IN_FLAGS << 8);
2108                 fis.lba_low_ex          = req_task->hob_ports[3];
2109                 fis.lba_mid_ex          = req_task->hob_ports[4];
2110                 fis.lba_hi_ex           = req_task->hob_ports[5];
2111                 fis.features_ex         = req_task->hob_ports[1];
2112                 fis.sect_cnt_ex         = req_task->hob_ports[2];
2113
2114         } else {
2115                 req_task->in_flags.all = IDE_TASKFILE_STD_IN_FLAGS;
2116         }
2117
2118         force_single_sector = implicit_sector(fis.command, fis.features);
2119
2120         if ((taskin || taskout) && (!fis.sect_count)) {
2121                 if (nsect)
2122                         fis.sect_count = nsect;
2123                 else {
2124                         if (!force_single_sector) {
2125                                 dev_warn(&dd->pdev->dev,
2126                                         "data movement but "
2127                                         "sect_count is 0\n");
2128                                         err = -EINVAL;
2129                                         goto abort;
2130                         }
2131                 }
2132         }
2133
2134         dbg_printk(MTIP_DRV_NAME
2135                 " %s: cmd %x, feat %x, nsect %x,"
2136                 " sect/lbal %x, lcyl/lbam %x, hcyl/lbah %x,"
2137                 " head/dev %x\n",
2138                 __func__,
2139                 fis.command,
2140                 fis.features,
2141                 fis.sect_count,
2142                 fis.lba_low,
2143                 fis.lba_mid,
2144                 fis.lba_hi,
2145                 fis.device);
2146
2147         /* check for erase mode support during secure erase.*/
2148         if ((fis.command == ATA_CMD_SEC_ERASE_UNIT) && outbuf &&
2149                                         (outbuf[0] & MTIP_SEC_ERASE_MODE)) {
2150                 erasemode = 1;
2151         }
2152
2153         mtip_set_timeout(dd, &fis, &timeout, erasemode);
2154
2155         /* Determine the correct transfer size.*/
2156         if (force_single_sector)
2157                 transfer_size = ATA_SECT_SIZE;
2158         else
2159                 transfer_size = ATA_SECT_SIZE * fis.sect_count;
2160
2161         /* Execute the command.*/
2162         if (mtip_exec_internal_command(dd->port,
2163                                  &fis,
2164                                  5,
2165                                  dma_buffer,
2166                                  transfer_size,
2167                                  0,
2168                                  GFP_KERNEL,
2169                                  timeout) < 0) {
2170                 err = -EIO;
2171                 goto abort;
2172         }
2173
2174         task_file_data = readl(dd->port->mmio+PORT_TFDATA);
2175
2176         if ((req_task->data_phase == TASKFILE_IN) && !(task_file_data & 1)) {
2177                 reply = dd->port->rxfis + RX_FIS_PIO_SETUP;
2178                 req_task->io_ports[7] = reply->control;
2179         } else {
2180                 reply = dd->port->rxfis + RX_FIS_D2H_REG;
2181                 req_task->io_ports[7] = reply->command;
2182         }
2183
2184         /* reclaim the DMA buffers.*/
2185         if (inbuf_dma)
2186                 pci_unmap_single(dd->pdev, inbuf_dma,
2187                         taskin, DMA_FROM_DEVICE);
2188         if (outbuf_dma)
2189                 pci_unmap_single(dd->pdev, outbuf_dma,
2190                         taskout, DMA_TO_DEVICE);
2191         inbuf_dma  = 0;
2192         outbuf_dma = 0;
2193
2194         /* return the ATA registers to the caller.*/
2195         req_task->io_ports[1] = reply->features;
2196         req_task->io_ports[2] = reply->sect_count;
2197         req_task->io_ports[3] = reply->lba_low;
2198         req_task->io_ports[4] = reply->lba_mid;
2199         req_task->io_ports[5] = reply->lba_hi;
2200         req_task->io_ports[6] = reply->device;
2201
2202         if (req_task->out_flags.all & 1)  {
2203
2204                 req_task->hob_ports[3] = reply->lba_low_ex;
2205                 req_task->hob_ports[4] = reply->lba_mid_ex;
2206                 req_task->hob_ports[5] = reply->lba_hi_ex;
2207                 req_task->hob_ports[1] = reply->features_ex;
2208                 req_task->hob_ports[2] = reply->sect_cnt_ex;
2209         }
2210         dbg_printk(MTIP_DRV_NAME
2211                 " %s: Completion: stat %x,"
2212                 "err %x, sect_cnt %x, lbalo %x,"
2213                 "lbamid %x, lbahi %x, dev %x\n",
2214                 __func__,
2215                 req_task->io_ports[7],
2216                 req_task->io_ports[1],
2217                 req_task->io_ports[2],
2218                 req_task->io_ports[3],
2219                 req_task->io_ports[4],
2220                 req_task->io_ports[5],
2221                 req_task->io_ports[6]);
2222
2223         if (taskout) {
2224                 if (copy_to_user(buf + outtotal, outbuf, taskout)) {
2225                         err = -EFAULT;
2226                         goto abort;
2227                 }
2228         }
2229         if (taskin) {
2230                 if (copy_to_user(buf + intotal, inbuf, taskin)) {
2231                         err = -EFAULT;
2232                         goto abort;
2233                 }
2234         }
2235 abort:
2236         if (inbuf_dma)
2237                 pci_unmap_single(dd->pdev, inbuf_dma,
2238                                         taskin, DMA_FROM_DEVICE);
2239         if (outbuf_dma)
2240                 pci_unmap_single(dd->pdev, outbuf_dma,
2241                                         taskout, DMA_TO_DEVICE);
2242         kfree(outbuf);
2243         kfree(inbuf);
2244
2245         return err;
2246 }
2247
2248 /*
2249  * Handle IOCTL calls from the Block Layer.
2250  *
2251  * This function is called by the Block Layer when it receives an IOCTL
2252  * command that it does not understand. If the IOCTL command is not supported
2253  * this function returns -ENOTTY.
2254  *
2255  * @dd  Pointer to the driver data structure.
2256  * @cmd IOCTL command passed from the Block Layer.
2257  * @arg IOCTL argument passed from the Block Layer.
2258  *
2259  * return value
2260  *      0       The IOCTL completed successfully.
2261  *      -ENOTTY The specified command is not supported.
2262  *      -EFAULT An error occurred copying data to a user space buffer.
2263  *      -EIO    An error occurred while executing the command.
2264  */
2265 static int mtip_hw_ioctl(struct driver_data *dd, unsigned int cmd,
2266                          unsigned long arg)
2267 {
2268         switch (cmd) {
2269         case HDIO_GET_IDENTITY:
2270         {
2271                 if (copy_to_user((void __user *)arg, dd->port->identify,
2272                                                 sizeof(u16) * ATA_ID_WORDS))
2273                         return -EFAULT;
2274                 break;
2275         }
2276         case HDIO_DRIVE_CMD:
2277         {
2278                 u8 drive_command[4];
2279
2280                 /* Copy the user command info to our buffer. */
2281                 if (copy_from_user(drive_command,
2282                                          (void __user *) arg,
2283                                          sizeof(drive_command)))
2284                         return -EFAULT;
2285
2286                 /* Execute the drive command. */
2287                 if (exec_drive_command(dd->port,
2288                                          drive_command,
2289                                          (void __user *) (arg+4)))
2290                         return -EIO;
2291
2292                 /* Copy the status back to the users buffer. */
2293                 if (copy_to_user((void __user *) arg,
2294                                          drive_command,
2295                                          sizeof(drive_command)))
2296                         return -EFAULT;
2297
2298                 break;
2299         }
2300         case HDIO_DRIVE_TASK:
2301         {
2302                 u8 drive_command[7];
2303
2304                 /* Copy the user command info to our buffer. */
2305                 if (copy_from_user(drive_command,
2306                                          (void __user *) arg,
2307                                          sizeof(drive_command)))
2308                         return -EFAULT;
2309
2310                 /* Execute the drive command. */
2311                 if (exec_drive_task(dd->port, drive_command))
2312                         return -EIO;
2313
2314                 /* Copy the status back to the users buffer. */
2315                 if (copy_to_user((void __user *) arg,
2316                                          drive_command,
2317                                          sizeof(drive_command)))
2318                         return -EFAULT;
2319
2320                 break;
2321         }
2322         case HDIO_DRIVE_TASKFILE: {
2323                 ide_task_request_t req_task;
2324                 int ret, outtotal;
2325
2326                 if (copy_from_user(&req_task, (void __user *) arg,
2327                                         sizeof(req_task)))
2328                         return -EFAULT;
2329
2330                 outtotal = sizeof(req_task);
2331
2332                 ret = exec_drive_taskfile(dd, (void __user *) arg,
2333                                                 &req_task, outtotal);
2334
2335                 if (copy_to_user((void __user *) arg, &req_task,
2336                                                         sizeof(req_task)))
2337                         return -EFAULT;
2338
2339                 return ret;
2340         }
2341
2342         default:
2343                 return -EINVAL;
2344         }
2345         return 0;
2346 }
2347
2348 /*
2349  * Submit an IO to the hw
2350  *
2351  * This function is called by the block layer to issue an io
2352  * to the device. Upon completion, the callback function will
2353  * be called with the data parameter passed as the callback data.
2354  *
2355  * @dd       Pointer to the driver data structure.
2356  * @start    First sector to read.
2357  * @nsect    Number of sectors to read.
2358  * @nents    Number of entries in scatter list for the read command.
2359  * @tag      The tag of this read command.
2360  * @callback Pointer to the function that should be called
2361  *           when the read completes.
2362  * @data     Callback data passed to the callback function
2363  *           when the read completes.
2364  * @dir      Direction (read or write)
2365  *
2366  * return value
2367  *      None
2368  */
2369 static void mtip_hw_submit_io(struct driver_data *dd, struct request *rq,
2370                               struct mtip_cmd *command, int nents,
2371                               struct blk_mq_hw_ctx *hctx)
2372 {
2373         struct host_to_dev_fis  *fis;
2374         struct mtip_port *port = dd->port;
2375         int dma_dir = rq_data_dir(rq) == READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
2376         u64 start = blk_rq_pos(rq);
2377         unsigned int nsect = blk_rq_sectors(rq);
2378
2379         /* Map the scatter list for DMA access */
2380         nents = dma_map_sg(&dd->pdev->dev, command->sg, nents, dma_dir);
2381
2382         prefetch(&port->flags);
2383
2384         command->scatter_ents = nents;
2385
2386         /*
2387          * The number of retries for this command before it is
2388          * reported as a failure to the upper layers.
2389          */
2390         command->retries = MTIP_MAX_RETRIES;
2391
2392         /* Fill out fis */
2393         fis = command->command;
2394         fis->type        = 0x27;
2395         fis->opts        = 1 << 7;
2396         if (dma_dir == DMA_FROM_DEVICE)
2397                 fis->command = ATA_CMD_FPDMA_READ;
2398         else
2399                 fis->command = ATA_CMD_FPDMA_WRITE;
2400         fis->lba_low     = start & 0xFF;
2401         fis->lba_mid     = (start >> 8) & 0xFF;
2402         fis->lba_hi      = (start >> 16) & 0xFF;
2403         fis->lba_low_ex  = (start >> 24) & 0xFF;
2404         fis->lba_mid_ex  = (start >> 32) & 0xFF;
2405         fis->lba_hi_ex   = (start >> 40) & 0xFF;
2406         fis->device      = 1 << 6;
2407         fis->features    = nsect & 0xFF;
2408         fis->features_ex = (nsect >> 8) & 0xFF;
2409         fis->sect_count  = ((rq->tag << 3) | (rq->tag >> 5));
2410         fis->sect_cnt_ex = 0;
2411         fis->control     = 0;
2412         fis->res2        = 0;
2413         fis->res3        = 0;
2414         fill_command_sg(dd, command, nents);
2415
2416         if (unlikely(command->unaligned))
2417                 fis->device |= 1 << 7;
2418
2419         /* Populate the command header */
2420         command->command_header->opts =
2421                         __force_bit2int cpu_to_le32(
2422                                 (nents << 16) | 5 | AHCI_CMD_PREFETCH);
2423         command->command_header->byte_count = 0;
2424
2425         /*
2426          * Set the completion function and data for the command
2427          * within this layer.
2428          */
2429         command->comp_data = dd;
2430         command->comp_func = mtip_async_complete;
2431         command->direction = dma_dir;
2432
2433         /*
2434          * To prevent this command from being issued
2435          * if an internal command is in progress or error handling is active.
2436          */
2437         if (unlikely(port->flags & MTIP_PF_PAUSE_IO)) {
2438                 set_bit(rq->tag, port->cmds_to_issue);
2439                 set_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2440                 return;
2441         }
2442
2443         /* Issue the command to the hardware */
2444         mtip_issue_ncq_command(port, rq->tag);
2445 }
2446
2447 /*
2448  * Sysfs status dump.
2449  *
2450  * @dev  Pointer to the device structure, passed by the kernrel.
2451  * @attr Pointer to the device_attribute structure passed by the kernel.
2452  * @buf  Pointer to the char buffer that will receive the stats info.
2453  *
2454  * return value
2455  *      The size, in bytes, of the data copied into buf.
2456  */
2457 static ssize_t mtip_hw_show_status(struct device *dev,
2458                                 struct device_attribute *attr,
2459                                 char *buf)
2460 {
2461         struct driver_data *dd = dev_to_disk(dev)->private_data;
2462         int size = 0;
2463
2464         if (test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))
2465                 size += sprintf(buf, "%s", "thermal_shutdown\n");
2466         else if (test_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag))
2467                 size += sprintf(buf, "%s", "write_protect\n");
2468         else
2469                 size += sprintf(buf, "%s", "online\n");
2470
2471         return size;
2472 }
2473
2474 static DEVICE_ATTR(status, S_IRUGO, mtip_hw_show_status, NULL);
2475
2476 /* debugsfs entries */
2477
2478 static ssize_t show_device_status(struct device_driver *drv, char *buf)
2479 {
2480         int size = 0;
2481         struct driver_data *dd, *tmp;
2482         unsigned long flags;
2483         char id_buf[42];
2484         u16 status = 0;
2485
2486         spin_lock_irqsave(&dev_lock, flags);
2487         size += sprintf(&buf[size], "Devices Present:\n");
2488         list_for_each_entry_safe(dd, tmp, &online_list, online_list) {
2489                 if (dd->pdev) {
2490                         if (dd->port &&
2491                             dd->port->identify &&
2492                             dd->port->identify_valid) {
2493                                 strlcpy(id_buf,
2494                                         (char *) (dd->port->identify + 10), 21);
2495                                 status = *(dd->port->identify + 141);
2496                         } else {
2497                                 memset(id_buf, 0, 42);
2498                                 status = 0;
2499                         }
2500
2501                         if (dd->port &&
2502                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2503                                 size += sprintf(&buf[size],
2504                                         " device %s %s (ftl rebuild %d %%)\n",
2505                                         dev_name(&dd->pdev->dev),
2506                                         id_buf,
2507                                         status);
2508                         } else {
2509                                 size += sprintf(&buf[size],
2510                                         " device %s %s\n",
2511                                         dev_name(&dd->pdev->dev),
2512                                         id_buf);
2513                         }
2514                 }
2515         }
2516
2517         size += sprintf(&buf[size], "Devices Being Removed:\n");
2518         list_for_each_entry_safe(dd, tmp, &removing_list, remove_list) {
2519                 if (dd->pdev) {
2520                         if (dd->port &&
2521                             dd->port->identify &&
2522                             dd->port->identify_valid) {
2523                                 strlcpy(id_buf,
2524                                         (char *) (dd->port->identify+10), 21);
2525                                 status = *(dd->port->identify + 141);
2526                         } else {
2527                                 memset(id_buf, 0, 42);
2528                                 status = 0;
2529                         }
2530
2531                         if (dd->port &&
2532                             test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags)) {
2533                                 size += sprintf(&buf[size],
2534                                         " device %s %s (ftl rebuild %d %%)\n",
2535                                         dev_name(&dd->pdev->dev),
2536                                         id_buf,
2537                                         status);
2538                         } else {
2539                                 size += sprintf(&buf[size],
2540                                         " device %s %s\n",
2541                                         dev_name(&dd->pdev->dev),
2542                                         id_buf);
2543                         }
2544                 }
2545         }
2546         spin_unlock_irqrestore(&dev_lock, flags);
2547
2548         return size;
2549 }
2550
2551 static ssize_t mtip_hw_read_device_status(struct file *f, char __user *ubuf,
2552                                                 size_t len, loff_t *offset)
2553 {
2554         struct driver_data *dd =  (struct driver_data *)f->private_data;
2555         int size = *offset;
2556         char *buf;
2557         int rv = 0;
2558
2559         if (!len || *offset)
2560                 return 0;
2561
2562         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2563         if (!buf) {
2564                 dev_err(&dd->pdev->dev,
2565                         "Memory allocation: status buffer\n");
2566                 return -ENOMEM;
2567         }
2568
2569         size += show_device_status(NULL, buf);
2570
2571         *offset = size <= len ? size : len;
2572         size = copy_to_user(ubuf, buf, *offset);
2573         if (size)
2574                 rv = -EFAULT;
2575
2576         kfree(buf);
2577         return rv ? rv : *offset;
2578 }
2579
2580 static ssize_t mtip_hw_read_registers(struct file *f, char __user *ubuf,
2581                                   size_t len, loff_t *offset)
2582 {
2583         struct driver_data *dd =  (struct driver_data *)f->private_data;
2584         char *buf;
2585         u32 group_allocated;
2586         int size = *offset;
2587         int n, rv = 0;
2588
2589         if (!len || size)
2590                 return 0;
2591
2592         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2593         if (!buf) {
2594                 dev_err(&dd->pdev->dev,
2595                         "Memory allocation: register buffer\n");
2596                 return -ENOMEM;
2597         }
2598
2599         size += sprintf(&buf[size], "H/ S ACTive      : [ 0x");
2600
2601         for (n = dd->slot_groups-1; n >= 0; n--)
2602                 size += sprintf(&buf[size], "%08X ",
2603                                          readl(dd->port->s_active[n]));
2604
2605         size += sprintf(&buf[size], "]\n");
2606         size += sprintf(&buf[size], "H/ Command Issue : [ 0x");
2607
2608         for (n = dd->slot_groups-1; n >= 0; n--)
2609                 size += sprintf(&buf[size], "%08X ",
2610                                         readl(dd->port->cmd_issue[n]));
2611
2612         size += sprintf(&buf[size], "]\n");
2613         size += sprintf(&buf[size], "H/ Completed     : [ 0x");
2614
2615         for (n = dd->slot_groups-1; n >= 0; n--)
2616                 size += sprintf(&buf[size], "%08X ",
2617                                 readl(dd->port->completed[n]));
2618
2619         size += sprintf(&buf[size], "]\n");
2620         size += sprintf(&buf[size], "H/ PORT IRQ STAT : [ 0x%08X ]\n",
2621                                 readl(dd->port->mmio + PORT_IRQ_STAT));
2622         size += sprintf(&buf[size], "H/ HOST IRQ STAT : [ 0x%08X ]\n",
2623                                 readl(dd->mmio + HOST_IRQ_STAT));
2624         size += sprintf(&buf[size], "\n");
2625
2626         size += sprintf(&buf[size], "L/ Commands in Q : [ 0x");
2627
2628         for (n = dd->slot_groups-1; n >= 0; n--) {
2629                 if (sizeof(long) > sizeof(u32))
2630                         group_allocated =
2631                                 dd->port->cmds_to_issue[n/2] >> (32*(n&1));
2632                 else
2633                         group_allocated = dd->port->cmds_to_issue[n];
2634                 size += sprintf(&buf[size], "%08X ", group_allocated);
2635         }
2636         size += sprintf(&buf[size], "]\n");
2637
2638         *offset = size <= len ? size : len;
2639         size = copy_to_user(ubuf, buf, *offset);
2640         if (size)
2641                 rv = -EFAULT;
2642
2643         kfree(buf);
2644         return rv ? rv : *offset;
2645 }
2646
2647 static ssize_t mtip_hw_read_flags(struct file *f, char __user *ubuf,
2648                                   size_t len, loff_t *offset)
2649 {
2650         struct driver_data *dd =  (struct driver_data *)f->private_data;
2651         char *buf;
2652         int size = *offset;
2653         int rv = 0;
2654
2655         if (!len || size)
2656                 return 0;
2657
2658         buf = kzalloc(MTIP_DFS_MAX_BUF_SIZE, GFP_KERNEL);
2659         if (!buf) {
2660                 dev_err(&dd->pdev->dev,
2661                         "Memory allocation: flag buffer\n");
2662                 return -ENOMEM;
2663         }
2664
2665         size += sprintf(&buf[size], "Flag-port : [ %08lX ]\n",
2666                                                         dd->port->flags);
2667         size += sprintf(&buf[size], "Flag-dd   : [ %08lX ]\n",
2668                                                         dd->dd_flag);
2669
2670         *offset = size <= len ? size : len;
2671         size = copy_to_user(ubuf, buf, *offset);
2672         if (size)
2673                 rv = -EFAULT;
2674
2675         kfree(buf);
2676         return rv ? rv : *offset;
2677 }
2678
2679 static const struct file_operations mtip_device_status_fops = {
2680         .owner  = THIS_MODULE,
2681         .open   = simple_open,
2682         .read   = mtip_hw_read_device_status,
2683         .llseek = no_llseek,
2684 };
2685
2686 static const struct file_operations mtip_regs_fops = {
2687         .owner  = THIS_MODULE,
2688         .open   = simple_open,
2689         .read   = mtip_hw_read_registers,
2690         .llseek = no_llseek,
2691 };
2692
2693 static const struct file_operations mtip_flags_fops = {
2694         .owner  = THIS_MODULE,
2695         .open   = simple_open,
2696         .read   = mtip_hw_read_flags,
2697         .llseek = no_llseek,
2698 };
2699
2700 /*
2701  * Create the sysfs related attributes.
2702  *
2703  * @dd   Pointer to the driver data structure.
2704  * @kobj Pointer to the kobj for the block device.
2705  *
2706  * return value
2707  *      0       Operation completed successfully.
2708  *      -EINVAL Invalid parameter.
2709  */
2710 static int mtip_hw_sysfs_init(struct driver_data *dd, struct kobject *kobj)
2711 {
2712         if (!kobj || !dd)
2713                 return -EINVAL;
2714
2715         if (sysfs_create_file(kobj, &dev_attr_status.attr))
2716                 dev_warn(&dd->pdev->dev,
2717                         "Error creating 'status' sysfs entry\n");
2718         return 0;
2719 }
2720
2721 /*
2722  * Remove the sysfs related attributes.
2723  *
2724  * @dd   Pointer to the driver data structure.
2725  * @kobj Pointer to the kobj for the block device.
2726  *
2727  * return value
2728  *      0       Operation completed successfully.
2729  *      -EINVAL Invalid parameter.
2730  */
2731 static int mtip_hw_sysfs_exit(struct driver_data *dd, struct kobject *kobj)
2732 {
2733         if (!kobj || !dd)
2734                 return -EINVAL;
2735
2736         sysfs_remove_file(kobj, &dev_attr_status.attr);
2737
2738         return 0;
2739 }
2740
2741 static int mtip_hw_debugfs_init(struct driver_data *dd)
2742 {
2743         if (!dfs_parent)
2744                 return -1;
2745
2746         dd->dfs_node = debugfs_create_dir(dd->disk->disk_name, dfs_parent);
2747         if (IS_ERR_OR_NULL(dd->dfs_node)) {
2748                 dev_warn(&dd->pdev->dev,
2749                         "Error creating node %s under debugfs\n",
2750                                                 dd->disk->disk_name);
2751                 dd->dfs_node = NULL;
2752                 return -1;
2753         }
2754
2755         debugfs_create_file("flags", S_IRUGO, dd->dfs_node, dd,
2756                                                         &mtip_flags_fops);
2757         debugfs_create_file("registers", S_IRUGO, dd->dfs_node, dd,
2758                                                         &mtip_regs_fops);
2759
2760         return 0;
2761 }
2762
2763 static void mtip_hw_debugfs_exit(struct driver_data *dd)
2764 {
2765         if (dd->dfs_node)
2766                 debugfs_remove_recursive(dd->dfs_node);
2767 }
2768
2769 /*
2770  * Perform any init/resume time hardware setup
2771  *
2772  * @dd Pointer to the driver data structure.
2773  *
2774  * return value
2775  *      None
2776  */
2777 static inline void hba_setup(struct driver_data *dd)
2778 {
2779         u32 hwdata;
2780         hwdata = readl(dd->mmio + HOST_HSORG);
2781
2782         /* interrupt bug workaround: use only 1 IS bit.*/
2783         writel(hwdata |
2784                 HSORG_DISABLE_SLOTGRP_INTR |
2785                 HSORG_DISABLE_SLOTGRP_PXIS,
2786                 dd->mmio + HOST_HSORG);
2787 }
2788
2789 static int mtip_device_unaligned_constrained(struct driver_data *dd)
2790 {
2791         return (dd->pdev->device == P420M_DEVICE_ID ? 1 : 0);
2792 }
2793
2794 /*
2795  * Detect the details of the product, and store anything needed
2796  * into the driver data structure.  This includes product type and
2797  * version and number of slot groups.
2798  *
2799  * @dd Pointer to the driver data structure.
2800  *
2801  * return value
2802  *      None
2803  */
2804 static void mtip_detect_product(struct driver_data *dd)
2805 {
2806         u32 hwdata;
2807         unsigned int rev, slotgroups;
2808
2809         /*
2810          * HBA base + 0xFC [15:0] - vendor-specific hardware interface
2811          * info register:
2812          * [15:8] hardware/software interface rev#
2813          * [   3] asic-style interface
2814          * [ 2:0] number of slot groups, minus 1 (only valid for asic-style).
2815          */
2816         hwdata = readl(dd->mmio + HOST_HSORG);
2817
2818         dd->product_type = MTIP_PRODUCT_UNKNOWN;
2819         dd->slot_groups = 1;
2820
2821         if (hwdata & 0x8) {
2822                 dd->product_type = MTIP_PRODUCT_ASICFPGA;
2823                 rev = (hwdata & HSORG_HWREV) >> 8;
2824                 slotgroups = (hwdata & HSORG_SLOTGROUPS) + 1;
2825                 dev_info(&dd->pdev->dev,
2826                         "ASIC-FPGA design, HS rev 0x%x, "
2827                         "%i slot groups [%i slots]\n",
2828                          rev,
2829                          slotgroups,
2830                          slotgroups * 32);
2831
2832                 if (slotgroups > MTIP_MAX_SLOT_GROUPS) {
2833                         dev_warn(&dd->pdev->dev,
2834                                 "Warning: driver only supports "
2835                                 "%i slot groups.\n", MTIP_MAX_SLOT_GROUPS);
2836                         slotgroups = MTIP_MAX_SLOT_GROUPS;
2837                 }
2838                 dd->slot_groups = slotgroups;
2839                 return;
2840         }
2841
2842         dev_warn(&dd->pdev->dev, "Unrecognized product id\n");
2843 }
2844
2845 /*
2846  * Blocking wait for FTL rebuild to complete
2847  *
2848  * @dd Pointer to the DRIVER_DATA structure.
2849  *
2850  * return value
2851  *      0       FTL rebuild completed successfully
2852  *      -EFAULT FTL rebuild error/timeout/interruption
2853  */
2854 static int mtip_ftl_rebuild_poll(struct driver_data *dd)
2855 {
2856         unsigned long timeout, cnt = 0, start;
2857
2858         dev_warn(&dd->pdev->dev,
2859                 "FTL rebuild in progress. Polling for completion.\n");
2860
2861         start = jiffies;
2862         timeout = jiffies + msecs_to_jiffies(MTIP_FTL_REBUILD_TIMEOUT_MS);
2863
2864         do {
2865                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2866                                 &dd->dd_flag)))
2867                         return -EFAULT;
2868                 if (mtip_check_surprise_removal(dd->pdev))
2869                         return -EFAULT;
2870
2871                 if (mtip_get_identify(dd->port, NULL) < 0)
2872                         return -EFAULT;
2873
2874                 if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
2875                         MTIP_FTL_REBUILD_MAGIC) {
2876                         ssleep(1);
2877                         /* Print message every 3 minutes */
2878                         if (cnt++ >= 180) {
2879                                 dev_warn(&dd->pdev->dev,
2880                                 "FTL rebuild in progress (%d secs).\n",
2881                                 jiffies_to_msecs(jiffies - start) / 1000);
2882                                 cnt = 0;
2883                         }
2884                 } else {
2885                         dev_warn(&dd->pdev->dev,
2886                                 "FTL rebuild complete (%d secs).\n",
2887                         jiffies_to_msecs(jiffies - start) / 1000);
2888                         mtip_block_initialize(dd);
2889                         return 0;
2890                 }
2891         } while (time_before(jiffies, timeout));
2892
2893         /* Check for timeout */
2894         dev_err(&dd->pdev->dev,
2895                 "Timed out waiting for FTL rebuild to complete (%d secs).\n",
2896                 jiffies_to_msecs(jiffies - start) / 1000);
2897         return -EFAULT;
2898 }
2899
2900 /*
2901  * service thread to issue queued commands
2902  *
2903  * @data Pointer to the driver data structure.
2904  *
2905  * return value
2906  *      0
2907  */
2908
2909 static int mtip_service_thread(void *data)
2910 {
2911         struct driver_data *dd = (struct driver_data *)data;
2912         unsigned long slot, slot_start, slot_wrap;
2913         unsigned int num_cmd_slots = dd->slot_groups * 32;
2914         struct mtip_port *port = dd->port;
2915
2916         while (1) {
2917                 if (kthread_should_stop() ||
2918                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2919                         goto st_out;
2920                 clear_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2921
2922                 /*
2923                  * the condition is to check neither an internal command is
2924                  * is in progress nor error handling is active
2925                  */
2926                 wait_event_interruptible(port->svc_wait, (port->flags) &&
2927                         !(port->flags & MTIP_PF_PAUSE_IO));
2928
2929                 set_bit(MTIP_PF_SVC_THD_ACTIVE_BIT, &port->flags);
2930
2931                 if (kthread_should_stop() ||
2932                         test_bit(MTIP_PF_SVC_THD_STOP_BIT, &port->flags))
2933                         goto st_out;
2934
2935                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
2936                                 &dd->dd_flag)))
2937                         goto st_out;
2938
2939 restart_eh:
2940                 /* Demux bits: start with error handling */
2941                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags)) {
2942                         mtip_handle_tfe(dd);
2943                         clear_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags);
2944                 }
2945
2946                 if (test_bit(MTIP_PF_EH_ACTIVE_BIT, &port->flags))
2947                         goto restart_eh;
2948
2949                 if (test_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags)) {
2950                         slot = 1;
2951                         /* used to restrict the loop to one iteration */
2952                         slot_start = num_cmd_slots;
2953                         slot_wrap = 0;
2954                         while (1) {
2955                                 slot = find_next_bit(port->cmds_to_issue,
2956                                                 num_cmd_slots, slot);
2957                                 if (slot_wrap == 1) {
2958                                         if ((slot_start >= slot) ||
2959                                                 (slot >= num_cmd_slots))
2960                                                 break;
2961                                 }
2962                                 if (unlikely(slot_start == num_cmd_slots))
2963                                         slot_start = slot;
2964
2965                                 if (unlikely(slot == num_cmd_slots)) {
2966                                         slot = 1;
2967                                         slot_wrap = 1;
2968                                         continue;
2969                                 }
2970
2971                                 /* Issue the command to the hardware */
2972                                 mtip_issue_ncq_command(port, slot);
2973
2974                                 clear_bit(slot, port->cmds_to_issue);
2975                         }
2976
2977                         clear_bit(MTIP_PF_ISSUE_CMDS_BIT, &port->flags);
2978                 }
2979
2980                 if (test_bit(MTIP_PF_REBUILD_BIT, &port->flags)) {
2981                         if (mtip_ftl_rebuild_poll(dd) < 0)
2982                                 set_bit(MTIP_DDF_REBUILD_FAILED_BIT,
2983                                                         &dd->dd_flag);
2984                         clear_bit(MTIP_PF_REBUILD_BIT, &port->flags);
2985                 }
2986         }
2987
2988 st_out:
2989         return 0;
2990 }
2991
2992 /*
2993  * DMA region teardown
2994  *
2995  * @dd Pointer to driver_data structure
2996  *
2997  * return value
2998  *      None
2999  */
3000 static void mtip_dma_free(struct driver_data *dd)
3001 {
3002         struct mtip_port *port = dd->port;
3003
3004         if (port->block1)
3005                 dmam_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
3006                                         port->block1, port->block1_dma);
3007
3008         if (port->command_list) {
3009                 dmam_free_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
3010                                 port->command_list, port->command_list_dma);
3011         }
3012 }
3013
3014 /*
3015  * DMA region setup
3016  *
3017  * @dd Pointer to driver_data structure
3018  *
3019  * return value
3020  *      -ENOMEM Not enough free DMA region space to initialize driver
3021  */
3022 static int mtip_dma_alloc(struct driver_data *dd)
3023 {
3024         struct mtip_port *port = dd->port;
3025
3026         /* Allocate dma memory for RX Fis, Identify, and Sector Bufffer */
3027         port->block1 =
3028                 dmam_alloc_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
3029                                         &port->block1_dma, GFP_KERNEL);
3030         if (!port->block1)
3031                 return -ENOMEM;
3032         memset(port->block1, 0, BLOCK_DMA_ALLOC_SZ);
3033
3034         /* Allocate dma memory for command list */
3035         port->command_list =
3036                 dmam_alloc_coherent(&dd->pdev->dev, AHCI_CMD_TBL_SZ,
3037                                         &port->command_list_dma, GFP_KERNEL);
3038         if (!port->command_list) {
3039                 dmam_free_coherent(&dd->pdev->dev, BLOCK_DMA_ALLOC_SZ,
3040                                         port->block1, port->block1_dma);
3041                 port->block1 = NULL;
3042                 port->block1_dma = 0;
3043                 return -ENOMEM;
3044         }
3045         memset(port->command_list, 0, AHCI_CMD_TBL_SZ);
3046
3047         /* Setup all pointers into first DMA region */
3048         port->rxfis         = port->block1 + AHCI_RX_FIS_OFFSET;
3049         port->rxfis_dma     = port->block1_dma + AHCI_RX_FIS_OFFSET;
3050         port->identify      = port->block1 + AHCI_IDFY_OFFSET;
3051         port->identify_dma  = port->block1_dma + AHCI_IDFY_OFFSET;
3052         port->log_buf       = port->block1 + AHCI_SECTBUF_OFFSET;
3053         port->log_buf_dma   = port->block1_dma + AHCI_SECTBUF_OFFSET;
3054         port->smart_buf     = port->block1 + AHCI_SMARTBUF_OFFSET;
3055         port->smart_buf_dma = port->block1_dma + AHCI_SMARTBUF_OFFSET;
3056
3057         return 0;
3058 }
3059
3060 static int mtip_hw_get_identify(struct driver_data *dd)
3061 {
3062         struct smart_attr attr242;
3063         unsigned char *buf;
3064         int rv;
3065
3066         if (mtip_get_identify(dd->port, NULL) < 0)
3067                 return -EFAULT;
3068
3069         if (*(dd->port->identify + MTIP_FTL_REBUILD_OFFSET) ==
3070                 MTIP_FTL_REBUILD_MAGIC) {
3071                 set_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags);
3072                 return MTIP_FTL_REBUILD_MAGIC;
3073         }
3074         mtip_dump_identify(dd->port);
3075
3076         /* check write protect, over temp and rebuild statuses */
3077         rv = mtip_read_log_page(dd->port, ATA_LOG_SATA_NCQ,
3078                                 dd->port->log_buf,
3079                                 dd->port->log_buf_dma, 1);
3080         if (rv) {
3081                 dev_warn(&dd->pdev->dev,
3082                         "Error in READ LOG EXT (10h) command\n");
3083                 /* non-critical error, don't fail the load */
3084         } else {
3085                 buf = (unsigned char *)dd->port->log_buf;
3086                 if (buf[259] & 0x1) {
3087                         dev_info(&dd->pdev->dev,
3088                                 "Write protect bit is set.\n");
3089                         set_bit(MTIP_DDF_WRITE_PROTECT_BIT, &dd->dd_flag);
3090                 }
3091                 if (buf[288] == 0xF7) {
3092                         dev_info(&dd->pdev->dev,
3093                                 "Exceeded Tmax, drive in thermal shutdown.\n");
3094                         set_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag);
3095                 }
3096                 if (buf[288] == 0xBF) {
3097                         dev_info(&dd->pdev->dev,
3098                                 "Drive indicates rebuild has failed.\n");
3099                         /* TODO */
3100                 }
3101         }
3102
3103         /* get write protect progess */
3104         memset(&attr242, 0, sizeof(struct smart_attr));
3105         if (mtip_get_smart_attr(dd->port, 242, &attr242))
3106                 dev_warn(&dd->pdev->dev,
3107                                 "Unable to check write protect progress\n");
3108         else
3109                 dev_info(&dd->pdev->dev,
3110                                 "Write protect progress: %u%% (%u blocks)\n",
3111                                 attr242.cur, le32_to_cpu(attr242.data));
3112
3113         return rv;
3114 }
3115
3116 /*
3117  * Called once for each card.
3118  *
3119  * @dd Pointer to the driver data structure.
3120  *
3121  * return value
3122  *      0 on success, else an error code.
3123  */
3124 static int mtip_hw_init(struct driver_data *dd)
3125 {
3126         int i;
3127         int rv;
3128         unsigned int num_command_slots;
3129         unsigned long timeout, timetaken;
3130
3131         dd->mmio = pcim_iomap_table(dd->pdev)[MTIP_ABAR];
3132
3133         mtip_detect_product(dd);
3134         if (dd->product_type == MTIP_PRODUCT_UNKNOWN) {
3135                 rv = -EIO;
3136                 goto out1;
3137         }
3138         num_command_slots = dd->slot_groups * 32;
3139
3140         hba_setup(dd);
3141
3142         dd->port = kzalloc_node(sizeof(struct mtip_port), GFP_KERNEL,
3143                                 dd->numa_node);
3144         if (!dd->port) {
3145                 dev_err(&dd->pdev->dev,
3146                         "Memory allocation: port structure\n");
3147                 return -ENOMEM;
3148         }
3149
3150         /* Continue workqueue setup */
3151         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
3152                 dd->work[i].port = dd->port;
3153
3154         /* Enable unaligned IO constraints for some devices */
3155         if (mtip_device_unaligned_constrained(dd))
3156                 dd->unal_qdepth = MTIP_MAX_UNALIGNED_SLOTS;
3157         else
3158                 dd->unal_qdepth = 0;
3159
3160         sema_init(&dd->port->cmd_slot_unal, dd->unal_qdepth);
3161
3162         /* Spinlock to prevent concurrent issue */
3163         for (i = 0; i < MTIP_MAX_SLOT_GROUPS; i++)
3164                 spin_lock_init(&dd->port->cmd_issue_lock[i]);
3165
3166         /* Set the port mmio base address. */
3167         dd->port->mmio  = dd->mmio + PORT_OFFSET;
3168         dd->port->dd    = dd;
3169
3170         /* DMA allocations */
3171         rv = mtip_dma_alloc(dd);
3172         if (rv < 0)
3173                 goto out1;
3174
3175         /* Setup the pointers to the extended s_active and CI registers. */
3176         for (i = 0; i < dd->slot_groups; i++) {
3177                 dd->port->s_active[i] =
3178                         dd->port->mmio + i*0x80 + PORT_SCR_ACT;
3179                 dd->port->cmd_issue[i] =
3180                         dd->port->mmio + i*0x80 + PORT_COMMAND_ISSUE;
3181                 dd->port->completed[i] =
3182                         dd->port->mmio + i*0x80 + PORT_SDBV;
3183         }
3184
3185         timetaken = jiffies;
3186         timeout = jiffies + msecs_to_jiffies(30000);
3187         while (((readl(dd->port->mmio + PORT_SCR_STAT) & 0x0F) != 0x03) &&
3188                  time_before(jiffies, timeout)) {
3189                 mdelay(100);
3190         }
3191         if (unlikely(mtip_check_surprise_removal(dd->pdev))) {
3192                 timetaken = jiffies - timetaken;
3193                 dev_warn(&dd->pdev->dev,
3194                         "Surprise removal detected at %u ms\n",
3195                         jiffies_to_msecs(timetaken));
3196                 rv = -ENODEV;
3197                 goto out2 ;
3198         }
3199         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag))) {
3200                 timetaken = jiffies - timetaken;
3201                 dev_warn(&dd->pdev->dev,
3202                         "Removal detected at %u ms\n",
3203                         jiffies_to_msecs(timetaken));
3204                 rv = -EFAULT;
3205                 goto out2;
3206         }
3207
3208         /* Conditionally reset the HBA. */
3209         if (!(readl(dd->mmio + HOST_CAP) & HOST_CAP_NZDMA)) {
3210                 if (mtip_hba_reset(dd) < 0) {
3211                         dev_err(&dd->pdev->dev,
3212                                 "Card did not reset within timeout\n");
3213                         rv = -EIO;
3214                         goto out2;
3215                 }
3216         } else {
3217                 /* Clear any pending interrupts on the HBA */
3218                 writel(readl(dd->mmio + HOST_IRQ_STAT),
3219                         dd->mmio + HOST_IRQ_STAT);
3220         }
3221
3222         mtip_init_port(dd->port);
3223         mtip_start_port(dd->port);
3224
3225         /* Setup the ISR and enable interrupts. */
3226         rv = devm_request_irq(&dd->pdev->dev,
3227                                 dd->pdev->irq,
3228                                 mtip_irq_handler,
3229                                 IRQF_SHARED,
3230                                 dev_driver_string(&dd->pdev->dev),
3231                                 dd);
3232
3233         if (rv) {
3234                 dev_err(&dd->pdev->dev,
3235                         "Unable to allocate IRQ %d\n", dd->pdev->irq);
3236                 goto out2;
3237         }
3238         irq_set_affinity_hint(dd->pdev->irq, get_cpu_mask(dd->isr_binding));
3239
3240         /* Enable interrupts on the HBA. */
3241         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3242                                         dd->mmio + HOST_CTL);
3243
3244         init_waitqueue_head(&dd->port->svc_wait);
3245
3246         if (test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)) {
3247                 rv = -EFAULT;
3248                 goto out3;
3249         }
3250
3251         return rv;
3252
3253 out3:
3254         /* Disable interrupts on the HBA. */
3255         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3256                         dd->mmio + HOST_CTL);
3257
3258         /* Release the IRQ. */
3259         irq_set_affinity_hint(dd->pdev->irq, NULL);
3260         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3261
3262 out2:
3263         mtip_deinit_port(dd->port);
3264         mtip_dma_free(dd);
3265
3266 out1:
3267         /* Free the memory allocated for the for structure. */
3268         kfree(dd->port);
3269
3270         return rv;
3271 }
3272
3273 static void mtip_standby_drive(struct driver_data *dd)
3274 {
3275         if (dd->sr)
3276                 return;
3277
3278         /*
3279          * Send standby immediate (E0h) to the drive so that it
3280          * saves its state.
3281          */
3282         if (!test_bit(MTIP_PF_REBUILD_BIT, &dd->port->flags) &&
3283             !test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag))
3284                 if (mtip_standby_immediate(dd->port))
3285                         dev_warn(&dd->pdev->dev,
3286                                 "STANDBY IMMEDIATE failed\n");
3287 }
3288
3289 /*
3290  * Called to deinitialize an interface.
3291  *
3292  * @dd Pointer to the driver data structure.
3293  *
3294  * return value
3295  *      0
3296  */
3297 static int mtip_hw_exit(struct driver_data *dd)
3298 {
3299         /*
3300          * Send standby immediate (E0h) to the drive so that it
3301          * saves its state.
3302          */
3303         if (!dd->sr) {
3304                 /* de-initialize the port. */
3305                 mtip_deinit_port(dd->port);
3306
3307                 /* Disable interrupts on the HBA. */
3308                 writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3309                                 dd->mmio + HOST_CTL);
3310         }
3311
3312         /* Release the IRQ. */
3313         irq_set_affinity_hint(dd->pdev->irq, NULL);
3314         devm_free_irq(&dd->pdev->dev, dd->pdev->irq, dd);
3315         msleep(1000);
3316
3317         /* Free dma regions */
3318         mtip_dma_free(dd);
3319
3320         /* Free the memory allocated for the for structure. */
3321         kfree(dd->port);
3322         dd->port = NULL;
3323
3324         return 0;
3325 }
3326
3327 /*
3328  * Issue a Standby Immediate command to the device.
3329  *
3330  * This function is called by the Block Layer just before the
3331  * system powers off during a shutdown.
3332  *
3333  * @dd Pointer to the driver data structure.
3334  *
3335  * return value
3336  *      0
3337  */
3338 static int mtip_hw_shutdown(struct driver_data *dd)
3339 {
3340         /*
3341          * Send standby immediate (E0h) to the drive so that it
3342          * saves its state.
3343          */
3344         if (!dd->sr && dd->port)
3345                 mtip_standby_immediate(dd->port);
3346
3347         return 0;
3348 }
3349
3350 /*
3351  * Suspend function
3352  *
3353  * This function is called by the Block Layer just before the
3354  * system hibernates.
3355  *
3356  * @dd Pointer to the driver data structure.
3357  *
3358  * return value
3359  *      0       Suspend was successful
3360  *      -EFAULT Suspend was not successful
3361  */
3362 static int mtip_hw_suspend(struct driver_data *dd)
3363 {
3364         /*
3365          * Send standby immediate (E0h) to the drive
3366          * so that it saves its state.
3367          */
3368         if (mtip_standby_immediate(dd->port) != 0) {
3369                 dev_err(&dd->pdev->dev,
3370                         "Failed standby-immediate command\n");
3371                 return -EFAULT;
3372         }
3373
3374         /* Disable interrupts on the HBA.*/
3375         writel(readl(dd->mmio + HOST_CTL) & ~HOST_IRQ_EN,
3376                         dd->mmio + HOST_CTL);
3377         mtip_deinit_port(dd->port);
3378
3379         return 0;
3380 }
3381
3382 /*
3383  * Resume function
3384  *
3385  * This function is called by the Block Layer as the
3386  * system resumes.
3387  *
3388  * @dd Pointer to the driver data structure.
3389  *
3390  * return value
3391  *      0       Resume was successful
3392  *      -EFAULT Resume was not successful
3393  */
3394 static int mtip_hw_resume(struct driver_data *dd)
3395 {
3396         /* Perform any needed hardware setup steps */
3397         hba_setup(dd);
3398
3399         /* Reset the HBA */
3400         if (mtip_hba_reset(dd) != 0) {
3401                 dev_err(&dd->pdev->dev,
3402                         "Unable to reset the HBA\n");
3403                 return -EFAULT;
3404         }
3405
3406         /*
3407          * Enable the port, DMA engine, and FIS reception specific
3408          * h/w in controller.
3409          */
3410         mtip_init_port(dd->port);
3411         mtip_start_port(dd->port);
3412
3413         /* Enable interrupts on the HBA.*/
3414         writel(readl(dd->mmio + HOST_CTL) | HOST_IRQ_EN,
3415                         dd->mmio + HOST_CTL);
3416
3417         return 0;
3418 }
3419
3420 /*
3421  * Helper function for reusing disk name
3422  * upon hot insertion.
3423  */
3424 static int rssd_disk_name_format(char *prefix,
3425                                  int index,
3426                                  char *buf,
3427                                  int buflen)
3428 {
3429         const int base = 'z' - 'a' + 1;
3430         char *begin = buf + strlen(prefix);
3431         char *end = buf + buflen;
3432         char *p;
3433         int unit;
3434
3435         p = end - 1;
3436         *p = '\0';
3437         unit = base;
3438         do {
3439                 if (p == begin)
3440                         return -EINVAL;
3441                 *--p = 'a' + (index % unit);
3442                 index = (index / unit) - 1;
3443         } while (index >= 0);
3444
3445         memmove(begin, p, end - p);
3446         memcpy(buf, prefix, strlen(prefix));
3447
3448         return 0;
3449 }
3450
3451 /*
3452  * Block layer IOCTL handler.
3453  *
3454  * @dev Pointer to the block_device structure.
3455  * @mode ignored
3456  * @cmd IOCTL command passed from the user application.
3457  * @arg Argument passed from the user application.
3458  *
3459  * return value
3460  *      0        IOCTL completed successfully.
3461  *      -ENOTTY  IOCTL not supported or invalid driver data
3462  *                 structure pointer.
3463  */
3464 static int mtip_block_ioctl(struct block_device *dev,
3465                             fmode_t mode,
3466                             unsigned cmd,
3467                             unsigned long arg)
3468 {
3469         struct driver_data *dd = dev->bd_disk->private_data;
3470
3471         if (!capable(CAP_SYS_ADMIN))
3472                 return -EACCES;
3473
3474         if (!dd)
3475                 return -ENOTTY;
3476
3477         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3478                 return -ENOTTY;
3479
3480         switch (cmd) {
3481         case BLKFLSBUF:
3482                 return -ENOTTY;
3483         default:
3484                 return mtip_hw_ioctl(dd, cmd, arg);
3485         }
3486 }
3487
3488 #ifdef CONFIG_COMPAT
3489 /*
3490  * Block layer compat IOCTL handler.
3491  *
3492  * @dev Pointer to the block_device structure.
3493  * @mode ignored
3494  * @cmd IOCTL command passed from the user application.
3495  * @arg Argument passed from the user application.
3496  *
3497  * return value
3498  *      0        IOCTL completed successfully.
3499  *      -ENOTTY  IOCTL not supported or invalid driver data
3500  *                 structure pointer.
3501  */
3502 static int mtip_block_compat_ioctl(struct block_device *dev,
3503                             fmode_t mode,
3504                             unsigned cmd,
3505                             unsigned long arg)
3506 {
3507         struct driver_data *dd = dev->bd_disk->private_data;
3508
3509         if (!capable(CAP_SYS_ADMIN))
3510                 return -EACCES;
3511
3512         if (!dd)
3513                 return -ENOTTY;
3514
3515         if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag)))
3516                 return -ENOTTY;
3517
3518         switch (cmd) {
3519         case BLKFLSBUF:
3520                 return -ENOTTY;
3521         case HDIO_DRIVE_TASKFILE: {
3522                 struct mtip_compat_ide_task_request_s __user *compat_req_task;
3523                 ide_task_request_t req_task;
3524                 int compat_tasksize, outtotal, ret;
3525
3526                 compat_tasksize =
3527                         sizeof(struct mtip_compat_ide_task_request_s);
3528
3529                 compat_req_task =
3530                         (struct mtip_compat_ide_task_request_s __user *) arg;
3531
3532                 if (copy_from_user(&req_task, (void __user *) arg,
3533                         compat_tasksize - (2 * sizeof(compat_long_t))))
3534                         return -EFAULT;
3535
3536                 if (get_user(req_task.out_size, &compat_req_task->out_size))
3537                         return -EFAULT;
3538
3539                 if (get_user(req_task.in_size, &compat_req_task->in_size))
3540                         return -EFAULT;
3541
3542                 outtotal = sizeof(struct mtip_compat_ide_task_request_s);
3543
3544                 ret = exec_drive_taskfile(dd, (void __user *) arg,
3545                                                 &req_task, outtotal);
3546
3547                 if (copy_to_user((void __user *) arg, &req_task,
3548                                 compat_tasksize -
3549                                 (2 * sizeof(compat_long_t))))
3550                         return -EFAULT;
3551
3552                 if (put_user(req_task.out_size, &compat_req_task->out_size))
3553                         return -EFAULT;
3554
3555                 if (put_user(req_task.in_size, &compat_req_task->in_size))
3556                         return -EFAULT;
3557
3558                 return ret;
3559         }
3560         default:
3561                 return mtip_hw_ioctl(dd, cmd, arg);
3562         }
3563 }
3564 #endif
3565
3566 /*
3567  * Obtain the geometry of the device.
3568  *
3569  * You may think that this function is obsolete, but some applications,
3570  * fdisk for example still used CHS values. This function describes the
3571  * device as having 224 heads and 56 sectors per cylinder. These values are
3572  * chosen so that each cylinder is aligned on a 4KB boundary. Since a
3573  * partition is described in terms of a start and end cylinder this means
3574  * that each partition is also 4KB aligned. Non-aligned partitions adversely
3575  * affects performance.
3576  *
3577  * @dev Pointer to the block_device strucutre.
3578  * @geo Pointer to a hd_geometry structure.
3579  *
3580  * return value
3581  *      0       Operation completed successfully.
3582  *      -ENOTTY An error occurred while reading the drive capacity.
3583  */
3584 static int mtip_block_getgeo(struct block_device *dev,
3585                                 struct hd_geometry *geo)
3586 {
3587         struct driver_data *dd = dev->bd_disk->private_data;
3588         sector_t capacity;
3589
3590         if (!dd)
3591                 return -ENOTTY;
3592
3593         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3594                 dev_warn(&dd->pdev->dev,
3595                         "Could not get drive capacity.\n");
3596                 return -ENOTTY;
3597         }
3598
3599         geo->heads = 224;
3600         geo->sectors = 56;
3601         sector_div(capacity, (geo->heads * geo->sectors));
3602         geo->cylinders = capacity;
3603         return 0;
3604 }
3605
3606 /*
3607  * Block device operation function.
3608  *
3609  * This structure contains pointers to the functions required by the block
3610  * layer.
3611  */
3612 static const struct block_device_operations mtip_block_ops = {
3613         .ioctl          = mtip_block_ioctl,
3614 #ifdef CONFIG_COMPAT
3615         .compat_ioctl   = mtip_block_compat_ioctl,
3616 #endif
3617         .getgeo         = mtip_block_getgeo,
3618         .owner          = THIS_MODULE
3619 };
3620
3621 static inline bool is_se_active(struct driver_data *dd)
3622 {
3623         if (unlikely(test_bit(MTIP_PF_SE_ACTIVE_BIT, &dd->port->flags))) {
3624                 if (dd->port->ic_pause_timer) {
3625                         unsigned long to = dd->port->ic_pause_timer +
3626                                                         msecs_to_jiffies(1000);
3627                         if (time_after(jiffies, to)) {
3628                                 clear_bit(MTIP_PF_SE_ACTIVE_BIT,
3629                                                         &dd->port->flags);
3630                                 clear_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag);
3631                                 dd->port->ic_pause_timer = 0;
3632                                 wake_up_interruptible(&dd->port->svc_wait);
3633                                 return false;
3634                         }
3635                 }
3636                 return true;
3637         }
3638         return false;
3639 }
3640
3641 /*
3642  * Block layer make request function.
3643  *
3644  * This function is called by the kernel to process a BIO for
3645  * the P320 device.
3646  *
3647  * @queue Pointer to the request queue. Unused other than to obtain
3648  *              the driver data structure.
3649  * @rq    Pointer to the request.
3650  *
3651  */
3652 static int mtip_submit_request(struct blk_mq_hw_ctx *hctx, struct request *rq)
3653 {
3654         struct driver_data *dd = hctx->queue->queuedata;
3655         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3656         unsigned int nents;
3657
3658         if (is_se_active(dd))
3659                 return -ENODATA;
3660
3661         if (unlikely(dd->dd_flag & MTIP_DDF_STOP_IO)) {
3662                 if (unlikely(test_bit(MTIP_DDF_REMOVE_PENDING_BIT,
3663                                                         &dd->dd_flag))) {
3664                         return -ENXIO;
3665                 }
3666                 if (unlikely(test_bit(MTIP_DDF_OVER_TEMP_BIT, &dd->dd_flag))) {
3667                         return -ENODATA;
3668                 }
3669                 if (unlikely(test_bit(MTIP_DDF_WRITE_PROTECT_BIT,
3670                                                         &dd->dd_flag) &&
3671                                 rq_data_dir(rq))) {
3672                         return -ENODATA;
3673                 }
3674                 if (unlikely(test_bit(MTIP_DDF_SEC_LOCK_BIT, &dd->dd_flag)))
3675                         return -ENODATA;
3676                 if (test_bit(MTIP_DDF_REBUILD_FAILED_BIT, &dd->dd_flag))
3677                         return -ENXIO;
3678         }
3679
3680         if (rq->cmd_flags & REQ_DISCARD) {
3681                 int err;
3682
3683                 err = mtip_send_trim(dd, blk_rq_pos(rq), blk_rq_sectors(rq));
3684                 blk_mq_end_request(rq, err);
3685                 return 0;
3686         }
3687
3688         /* Create the scatter list for this request. */
3689         nents = blk_rq_map_sg(hctx->queue, rq, cmd->sg);
3690
3691         /* Issue the read/write. */
3692         mtip_hw_submit_io(dd, rq, cmd, nents, hctx);
3693         return 0;
3694 }
3695
3696 static bool mtip_check_unal_depth(struct blk_mq_hw_ctx *hctx,
3697                                   struct request *rq)
3698 {
3699         struct driver_data *dd = hctx->queue->queuedata;
3700         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3701
3702         if (rq_data_dir(rq) == READ || !dd->unal_qdepth)
3703                 return false;
3704
3705         /*
3706          * If unaligned depth must be limited on this controller, mark it
3707          * as unaligned if the IO isn't on a 4k boundary (start of length).
3708          */
3709         if (blk_rq_sectors(rq) <= 64) {
3710                 if ((blk_rq_pos(rq) & 7) || (blk_rq_sectors(rq) & 7))
3711                         cmd->unaligned = 1;
3712         }
3713
3714         if (cmd->unaligned && down_trylock(&dd->port->cmd_slot_unal))
3715                 return true;
3716
3717         return false;
3718 }
3719
3720 static int mtip_queue_rq(struct blk_mq_hw_ctx *hctx,
3721                          const struct blk_mq_queue_data *bd)
3722 {
3723         struct request *rq = bd->rq;
3724         int ret;
3725
3726         if (unlikely(mtip_check_unal_depth(hctx, rq)))
3727                 return BLK_MQ_RQ_QUEUE_BUSY;
3728
3729         blk_mq_start_request(rq);
3730
3731         ret = mtip_submit_request(hctx, rq);
3732         if (likely(!ret))
3733                 return BLK_MQ_RQ_QUEUE_OK;
3734
3735         rq->errors = ret;
3736         return BLK_MQ_RQ_QUEUE_ERROR;
3737 }
3738
3739 static void mtip_free_cmd(void *data, struct request *rq,
3740                           unsigned int hctx_idx, unsigned int request_idx)
3741 {
3742         struct driver_data *dd = data;
3743         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3744
3745         if (!cmd->command)
3746                 return;
3747
3748         dmam_free_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
3749                                 cmd->command, cmd->command_dma);
3750 }
3751
3752 static int mtip_init_cmd(void *data, struct request *rq, unsigned int hctx_idx,
3753                          unsigned int request_idx, unsigned int numa_node)
3754 {
3755         struct driver_data *dd = data;
3756         struct mtip_cmd *cmd = blk_mq_rq_to_pdu(rq);
3757         u32 host_cap_64 = readl(dd->mmio + HOST_CAP) & HOST_CAP_64;
3758
3759         /*
3760          * For flush requests, request_idx starts at the end of the
3761          * tag space.  Since we don't support FLUSH/FUA, simply return
3762          * 0 as there's nothing to be done.
3763          */
3764         if (request_idx >= MTIP_MAX_COMMAND_SLOTS)
3765                 return 0;
3766
3767         cmd->command = dmam_alloc_coherent(&dd->pdev->dev, CMD_DMA_ALLOC_SZ,
3768                         &cmd->command_dma, GFP_KERNEL);
3769         if (!cmd->command)
3770                 return -ENOMEM;
3771
3772         memset(cmd->command, 0, CMD_DMA_ALLOC_SZ);
3773
3774         /* Point the command headers at the command tables. */
3775         cmd->command_header = dd->port->command_list +
3776                                 (sizeof(struct mtip_cmd_hdr) * request_idx);
3777         cmd->command_header_dma = dd->port->command_list_dma +
3778                                 (sizeof(struct mtip_cmd_hdr) * request_idx);
3779
3780         if (host_cap_64)
3781                 cmd->command_header->ctbau = __force_bit2int cpu_to_le32((cmd->command_dma >> 16) >> 16);
3782
3783         cmd->command_header->ctba = __force_bit2int cpu_to_le32(cmd->command_dma & 0xFFFFFFFF);
3784
3785         sg_init_table(cmd->sg, MTIP_MAX_SG);
3786         return 0;
3787 }
3788
3789 static struct blk_mq_ops mtip_mq_ops = {
3790         .queue_rq       = mtip_queue_rq,
3791         .map_queue      = blk_mq_map_queue,
3792         .init_request   = mtip_init_cmd,
3793         .exit_request   = mtip_free_cmd,
3794 };
3795
3796 /*
3797  * Block layer initialization function.
3798  *
3799  * This function is called once by the PCI layer for each P320
3800  * device that is connected to the system.
3801  *
3802  * @dd Pointer to the driver data structure.
3803  *
3804  * return value
3805  *      0 on success else an error code.
3806  */
3807 static int mtip_block_initialize(struct driver_data *dd)
3808 {
3809         int rv = 0, wait_for_rebuild = 0;
3810         sector_t capacity;
3811         unsigned int index = 0;
3812         struct kobject *kobj;
3813
3814         if (dd->disk)
3815                 goto skip_create_disk; /* hw init done, before rebuild */
3816
3817         if (mtip_hw_init(dd)) {
3818                 rv = -EINVAL;
3819                 goto protocol_init_error;
3820         }
3821
3822         dd->disk = alloc_disk_node(MTIP_MAX_MINORS, dd->numa_node);
3823         if (dd->disk  == NULL) {
3824                 dev_err(&dd->pdev->dev,
3825                         "Unable to allocate gendisk structure\n");
3826                 rv = -EINVAL;
3827                 goto alloc_disk_error;
3828         }
3829
3830         /* Generate the disk name, implemented same as in sd.c */
3831         do {
3832                 if (!ida_pre_get(&rssd_index_ida, GFP_KERNEL))
3833                         goto ida_get_error;
3834
3835                 spin_lock(&rssd_index_lock);
3836                 rv = ida_get_new(&rssd_index_ida, &index);
3837                 spin_unlock(&rssd_index_lock);
3838         } while (rv == -EAGAIN);
3839
3840         if (rv)
3841                 goto ida_get_error;
3842
3843         rv = rssd_disk_name_format("rssd",
3844                                 index,
3845                                 dd->disk->disk_name,
3846                                 DISK_NAME_LEN);
3847         if (rv)
3848                 goto disk_index_error;
3849
3850         dd->disk->driverfs_dev  = &dd->pdev->dev;
3851         dd->disk->major         = dd->major;
3852         dd->disk->first_minor   = index * MTIP_MAX_MINORS;
3853         dd->disk->minors        = MTIP_MAX_MINORS;
3854         dd->disk->fops          = &mtip_block_ops;
3855         dd->disk->private_data  = dd;
3856         dd->index               = index;
3857
3858         mtip_hw_debugfs_init(dd);
3859
3860 skip_create_disk:
3861         memset(&dd->tags, 0, sizeof(dd->tags));
3862         dd->tags.ops = &mtip_mq_ops;
3863         dd->tags.nr_hw_queues = 1;
3864         dd->tags.queue_depth = MTIP_MAX_COMMAND_SLOTS;
3865         dd->tags.reserved_tags = 1;
3866         dd->tags.cmd_size = sizeof(struct mtip_cmd);
3867         dd->tags.numa_node = dd->numa_node;
3868         dd->tags.flags = BLK_MQ_F_SHOULD_MERGE;
3869         dd->tags.driver_data = dd;
3870
3871         rv = blk_mq_alloc_tag_set(&dd->tags);
3872         if (rv) {
3873                 dev_err(&dd->pdev->dev,
3874                         "Unable to allocate request queue\n");
3875                 goto block_queue_alloc_init_error;
3876         }
3877
3878         /* Allocate the request queue. */
3879         dd->queue = blk_mq_init_queue(&dd->tags);
3880         if (IS_ERR(dd->queue)) {
3881                 dev_err(&dd->pdev->dev,
3882                         "Unable to allocate request queue\n");
3883                 rv = -ENOMEM;
3884                 goto block_queue_alloc_init_error;
3885         }
3886
3887         dd->disk->queue         = dd->queue;
3888         dd->queue->queuedata    = dd;
3889
3890         /* Initialize the protocol layer. */
3891         wait_for_rebuild = mtip_hw_get_identify(dd);
3892         if (wait_for_rebuild < 0) {
3893                 dev_err(&dd->pdev->dev,
3894                         "Protocol layer initialization failed\n");
3895                 rv = -EINVAL;
3896                 goto init_hw_cmds_error;
3897         }
3898
3899         /*
3900          * if rebuild pending, start the service thread, and delay the block
3901          * queue creation and add_disk()
3902          */
3903         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3904                 goto start_service_thread;
3905
3906         /* Set device limits. */
3907         set_bit(QUEUE_FLAG_NONROT, &dd->queue->queue_flags);
3908         clear_bit(QUEUE_FLAG_ADD_RANDOM, &dd->queue->queue_flags);
3909         blk_queue_max_segments(dd->queue, MTIP_MAX_SG);
3910         blk_queue_physical_block_size(dd->queue, 4096);
3911         blk_queue_max_hw_sectors(dd->queue, 0xffff);
3912         blk_queue_max_segment_size(dd->queue, 0x400000);
3913         blk_queue_io_min(dd->queue, 4096);
3914         blk_queue_bounce_limit(dd->queue, dd->pdev->dma_mask);
3915
3916         /*
3917          * write back cache is not supported in the device. FUA depends on
3918          * write back cache support, hence setting flush support to zero.
3919          */
3920         blk_queue_flush(dd->queue, 0);
3921
3922         /* Signal trim support */
3923         if (dd->trim_supp == true) {
3924                 set_bit(QUEUE_FLAG_DISCARD, &dd->queue->queue_flags);
3925                 dd->queue->limits.discard_granularity = 4096;
3926                 blk_queue_max_discard_sectors(dd->queue,
3927                         MTIP_MAX_TRIM_ENTRY_LEN * MTIP_MAX_TRIM_ENTRIES);
3928                 dd->queue->limits.discard_zeroes_data = 0;
3929         }
3930
3931         /* Set the capacity of the device in 512 byte sectors. */
3932         if (!(mtip_hw_get_capacity(dd, &capacity))) {
3933                 dev_warn(&dd->pdev->dev,
3934                         "Could not read drive capacity\n");
3935                 rv = -EIO;
3936                 goto read_capacity_error;
3937         }
3938         set_capacity(dd->disk, capacity);
3939
3940         /* Enable the block device and add it to /dev */
3941         add_disk(dd->disk);
3942
3943         dd->bdev = bdget_disk(dd->disk, 0);
3944         /*
3945          * Now that the disk is active, initialize any sysfs attributes
3946          * managed by the protocol layer.
3947          */
3948         kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
3949         if (kobj) {
3950                 mtip_hw_sysfs_init(dd, kobj);
3951                 kobject_put(kobj);
3952         }
3953
3954         if (dd->mtip_svc_handler) {
3955                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
3956                 return rv; /* service thread created for handling rebuild */
3957         }
3958
3959 start_service_thread:
3960         dd->mtip_svc_handler = kthread_create_on_node(mtip_service_thread,
3961                                                 dd, dd->numa_node,
3962                                                 "mtip_svc_thd_%02d", index);
3963
3964         if (IS_ERR(dd->mtip_svc_handler)) {
3965                 dev_err(&dd->pdev->dev, "service thread failed to start\n");
3966                 dd->mtip_svc_handler = NULL;
3967                 rv = -EFAULT;
3968                 goto kthread_run_error;
3969         }
3970         wake_up_process(dd->mtip_svc_handler);
3971         if (wait_for_rebuild == MTIP_FTL_REBUILD_MAGIC)
3972                 rv = wait_for_rebuild;
3973
3974         return rv;
3975
3976 kthread_run_error:
3977         bdput(dd->bdev);
3978         dd->bdev = NULL;
3979
3980         /* Delete our gendisk. This also removes the device from /dev */
3981         del_gendisk(dd->disk);
3982
3983 read_capacity_error:
3984 init_hw_cmds_error:
3985         blk_cleanup_queue(dd->queue);
3986         blk_mq_free_tag_set(&dd->tags);
3987 block_queue_alloc_init_error:
3988         mtip_hw_debugfs_exit(dd);
3989 disk_index_error:
3990         spin_lock(&rssd_index_lock);
3991         ida_remove(&rssd_index_ida, index);
3992         spin_unlock(&rssd_index_lock);
3993
3994 ida_get_error:
3995         put_disk(dd->disk);
3996
3997 alloc_disk_error:
3998         mtip_hw_exit(dd); /* De-initialize the protocol layer. */
3999
4000 protocol_init_error:
4001         return rv;
4002 }
4003
4004 /*
4005  * Block layer deinitialization function.
4006  *
4007  * Called by the PCI layer as each P320 device is removed.
4008  *
4009  * @dd Pointer to the driver data structure.
4010  *
4011  * return value
4012  *      0
4013  */
4014 static int mtip_block_remove(struct driver_data *dd)
4015 {
4016         struct kobject *kobj;
4017
4018         mtip_hw_debugfs_exit(dd);
4019
4020         if (dd->mtip_svc_handler) {
4021                 set_bit(MTIP_PF_SVC_THD_STOP_BIT, &dd->port->flags);
4022                 wake_up_interruptible(&dd->port->svc_wait);
4023                 kthread_stop(dd->mtip_svc_handler);
4024         }
4025
4026         /* Clean up the sysfs attributes, if created */
4027         if (test_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag)) {
4028                 kobj = kobject_get(&disk_to_dev(dd->disk)->kobj);
4029                 if (kobj) {
4030                         mtip_hw_sysfs_exit(dd, kobj);
4031                         kobject_put(kobj);
4032                 }
4033         }
4034
4035         if (!dd->sr)
4036                 mtip_standby_drive(dd);
4037         else
4038                 dev_info(&dd->pdev->dev, "device %s surprise removal\n",
4039                                                 dd->disk->disk_name);
4040
4041         /*
4042          * Delete our gendisk structure. This also removes the device
4043          * from /dev
4044          */
4045         if (dd->bdev) {
4046                 bdput(dd->bdev);
4047                 dd->bdev = NULL;
4048         }
4049         if (dd->disk) {
4050                 del_gendisk(dd->disk);
4051                 if (dd->disk->queue) {
4052                         blk_cleanup_queue(dd->queue);
4053                         blk_mq_free_tag_set(&dd->tags);
4054                         dd->queue = NULL;
4055                 }
4056                 put_disk(dd->disk);
4057         }
4058         dd->disk  = NULL;
4059
4060         spin_lock(&rssd_index_lock);
4061         ida_remove(&rssd_index_ida, dd->index);
4062         spin_unlock(&rssd_index_lock);
4063
4064         /* De-initialize the protocol layer. */
4065         mtip_hw_exit(dd);
4066
4067         return 0;
4068 }
4069
4070 /*
4071  * Function called by the PCI layer when just before the
4072  * machine shuts down.
4073  *
4074  * If a protocol layer shutdown function is present it will be called
4075  * by this function.
4076  *
4077  * @dd Pointer to the driver data structure.
4078  *
4079  * return value
4080  *      0
4081  */
4082 static int mtip_block_shutdown(struct driver_data *dd)
4083 {
4084         mtip_hw_shutdown(dd);
4085
4086         /* Delete our gendisk structure, and cleanup the blk queue. */
4087         if (dd->disk) {
4088                 dev_info(&dd->pdev->dev,
4089                         "Shutting down %s ...\n", dd->disk->disk_name);
4090
4091                 del_gendisk(dd->disk);
4092                 if (dd->disk->queue) {
4093                         blk_cleanup_queue(dd->queue);
4094                         blk_mq_free_tag_set(&dd->tags);
4095                 }
4096                 put_disk(dd->disk);
4097                 dd->disk  = NULL;
4098                 dd->queue = NULL;
4099         }
4100
4101         spin_lock(&rssd_index_lock);
4102         ida_remove(&rssd_index_ida, dd->index);
4103         spin_unlock(&rssd_index_lock);
4104         return 0;
4105 }
4106
4107 static int mtip_block_suspend(struct driver_data *dd)
4108 {
4109         dev_info(&dd->pdev->dev,
4110                 "Suspending %s ...\n", dd->disk->disk_name);
4111         mtip_hw_suspend(dd);
4112         return 0;
4113 }
4114
4115 static int mtip_block_resume(struct driver_data *dd)
4116 {
4117         dev_info(&dd->pdev->dev, "Resuming %s ...\n",
4118                 dd->disk->disk_name);
4119         mtip_hw_resume(dd);
4120         return 0;
4121 }
4122
4123 static void drop_cpu(int cpu)
4124 {
4125         cpu_use[cpu]--;
4126 }
4127
4128 static int get_least_used_cpu_on_node(int node)
4129 {
4130         int cpu, least_used_cpu, least_cnt;
4131         const struct cpumask *node_mask;
4132
4133         node_mask = cpumask_of_node(node);
4134         least_used_cpu = cpumask_first(node_mask);
4135         least_cnt = cpu_use[least_used_cpu];
4136         cpu = least_used_cpu;
4137
4138         for_each_cpu(cpu, node_mask) {
4139                 if (cpu_use[cpu] < least_cnt) {
4140                         least_used_cpu = cpu;
4141                         least_cnt = cpu_use[cpu];
4142                 }
4143         }
4144         cpu_use[least_used_cpu]++;
4145         return least_used_cpu;
4146 }
4147
4148 /* Helper for selecting a node in round robin mode */
4149 static inline int mtip_get_next_rr_node(void)
4150 {
4151         static int next_node = -1;
4152
4153         if (next_node == -1) {
4154                 next_node = first_online_node;
4155                 return next_node;
4156         }
4157
4158         next_node = next_online_node(next_node);
4159         if (next_node == MAX_NUMNODES)
4160                 next_node = first_online_node;
4161         return next_node;
4162 }
4163
4164 static DEFINE_HANDLER(0);
4165 static DEFINE_HANDLER(1);
4166 static DEFINE_HANDLER(2);
4167 static DEFINE_HANDLER(3);
4168 static DEFINE_HANDLER(4);
4169 static DEFINE_HANDLER(5);
4170 static DEFINE_HANDLER(6);
4171 static DEFINE_HANDLER(7);
4172
4173 static void mtip_disable_link_opts(struct driver_data *dd, struct pci_dev *pdev)
4174 {
4175         int pos;
4176         unsigned short pcie_dev_ctrl;
4177
4178         pos = pci_find_capability(pdev, PCI_CAP_ID_EXP);
4179         if (pos) {
4180                 pci_read_config_word(pdev,
4181                         pos + PCI_EXP_DEVCTL,
4182                         &pcie_dev_ctrl);
4183                 if (pcie_dev_ctrl & (1 << 11) ||
4184                     pcie_dev_ctrl & (1 << 4)) {
4185                         dev_info(&dd->pdev->dev,
4186                                 "Disabling ERO/No-Snoop on bridge device %04x:%04x\n",
4187                                         pdev->vendor, pdev->device);
4188                         pcie_dev_ctrl &= ~(PCI_EXP_DEVCTL_NOSNOOP_EN |
4189                                                 PCI_EXP_DEVCTL_RELAX_EN);
4190                         pci_write_config_word(pdev,
4191                                 pos + PCI_EXP_DEVCTL,
4192                                 pcie_dev_ctrl);
4193                 }
4194         }
4195 }
4196
4197 static void mtip_fix_ero_nosnoop(struct driver_data *dd, struct pci_dev *pdev)
4198 {
4199         /*
4200          * This workaround is specific to AMD/ATI chipset with a PCI upstream
4201          * device with device id 0x5aXX
4202          */
4203         if (pdev->bus && pdev->bus->self) {
4204                 if (pdev->bus->self->vendor == PCI_VENDOR_ID_ATI &&
4205                     ((pdev->bus->self->device & 0xff00) == 0x5a00)) {
4206                         mtip_disable_link_opts(dd, pdev->bus->self);
4207                 } else {
4208                         /* Check further up the topology */
4209                         struct pci_dev *parent_dev = pdev->bus->self;
4210                         if (parent_dev->bus &&
4211                                 parent_dev->bus->parent &&
4212                                 parent_dev->bus->parent->self &&
4213                                 parent_dev->bus->parent->self->vendor ==
4214                                          PCI_VENDOR_ID_ATI &&
4215                                 (parent_dev->bus->parent->self->device &
4216                                         0xff00) == 0x5a00) {
4217                                 mtip_disable_link_opts(dd,
4218                                         parent_dev->bus->parent->self);
4219                         }
4220                 }
4221         }
4222 }
4223
4224 /*
4225  * Called for each supported PCI device detected.
4226  *
4227  * This function allocates the private data structure, enables the
4228  * PCI device and then calls the block layer initialization function.
4229  *
4230  * return value
4231  *      0 on success else an error code.
4232  */
4233 static int mtip_pci_probe(struct pci_dev *pdev,
4234                         const struct pci_device_id *ent)
4235 {
4236         int rv = 0;
4237         struct driver_data *dd = NULL;
4238         char cpu_list[256];
4239         const struct cpumask *node_mask;
4240         int cpu, i = 0, j = 0;
4241         int my_node = NUMA_NO_NODE;
4242         unsigned long flags;
4243
4244         /* Allocate memory for this devices private data. */
4245         my_node = pcibus_to_node(pdev->bus);
4246         if (my_node != NUMA_NO_NODE) {
4247                 if (!node_online(my_node))
4248                         my_node = mtip_get_next_rr_node();
4249         } else {
4250                 dev_info(&pdev->dev, "Kernel not reporting proximity, choosing a node\n");
4251                 my_node = mtip_get_next_rr_node();
4252         }
4253         dev_info(&pdev->dev, "NUMA node %d (closest: %d,%d, probe on %d:%d)\n",
4254                 my_node, pcibus_to_node(pdev->bus), dev_to_node(&pdev->dev),
4255                 cpu_to_node(raw_smp_processor_id()), raw_smp_processor_id());
4256
4257         dd = kzalloc_node(sizeof(struct driver_data), GFP_KERNEL, my_node);
4258         if (dd == NULL) {
4259                 dev_err(&pdev->dev,
4260                         "Unable to allocate memory for driver data\n");
4261                 return -ENOMEM;
4262         }
4263
4264         /* Attach the private data to this PCI device.  */
4265         pci_set_drvdata(pdev, dd);
4266
4267         rv = pcim_enable_device(pdev);
4268         if (rv < 0) {
4269                 dev_err(&pdev->dev, "Unable to enable device\n");
4270                 goto iomap_err;
4271         }
4272
4273         /* Map BAR5 to memory. */
4274         rv = pcim_iomap_regions(pdev, 1 << MTIP_ABAR, MTIP_DRV_NAME);
4275         if (rv < 0) {
4276                 dev_err(&pdev->dev, "Unable to map regions\n");
4277                 goto iomap_err;
4278         }
4279
4280         if (!pci_set_dma_mask(pdev, DMA_BIT_MASK(64))) {
4281                 rv = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
4282
4283                 if (rv) {
4284                         rv = pci_set_consistent_dma_mask(pdev,
4285                                                 DMA_BIT_MASK(32));
4286                         if (rv) {
4287                                 dev_warn(&pdev->dev,
4288                                         "64-bit DMA enable failed\n");
4289                                 goto setmask_err;
4290                         }
4291                 }
4292         }
4293
4294         /* Copy the info we may need later into the private data structure. */
4295         dd->major       = mtip_major;
4296         dd->instance    = instance;
4297         dd->pdev        = pdev;
4298         dd->numa_node   = my_node;
4299
4300         INIT_LIST_HEAD(&dd->online_list);
4301         INIT_LIST_HEAD(&dd->remove_list);
4302
4303         memset(dd->workq_name, 0, 32);
4304         snprintf(dd->workq_name, 31, "mtipq%d", dd->instance);
4305
4306         dd->isr_workq = create_workqueue(dd->workq_name);
4307         if (!dd->isr_workq) {
4308                 dev_warn(&pdev->dev, "Can't create wq %d\n", dd->instance);
4309                 rv = -ENOMEM;
4310                 goto block_initialize_err;
4311         }
4312
4313         memset(cpu_list, 0, sizeof(cpu_list));
4314
4315         node_mask = cpumask_of_node(dd->numa_node);
4316         if (!cpumask_empty(node_mask)) {
4317                 for_each_cpu(cpu, node_mask)
4318                 {
4319                         snprintf(&cpu_list[j], 256 - j, "%d ", cpu);
4320                         j = strlen(cpu_list);
4321                 }
4322
4323                 dev_info(&pdev->dev, "Node %d on package %d has %d cpu(s): %s\n",
4324                         dd->numa_node,
4325                         topology_physical_package_id(cpumask_first(node_mask)),
4326                         nr_cpus_node(dd->numa_node),
4327                         cpu_list);
4328         } else
4329                 dev_dbg(&pdev->dev, "mtip32xx: node_mask empty\n");
4330
4331         dd->isr_binding = get_least_used_cpu_on_node(dd->numa_node);
4332         dev_info(&pdev->dev, "Initial IRQ binding node:cpu %d:%d\n",
4333                 cpu_to_node(dd->isr_binding), dd->isr_binding);
4334
4335         /* first worker context always runs in ISR */
4336         dd->work[0].cpu_binding = dd->isr_binding;
4337         dd->work[1].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4338         dd->work[2].cpu_binding = get_least_used_cpu_on_node(dd->numa_node);
4339         dd->work[3].cpu_binding = dd->work[0].cpu_binding;
4340         dd->work[4].cpu_binding = dd->work[1].cpu_binding;
4341         dd->work[5].cpu_binding = dd->work[2].cpu_binding;
4342         dd->work[6].cpu_binding = dd->work[2].cpu_binding;
4343         dd->work[7].cpu_binding = dd->work[1].cpu_binding;
4344
4345         /* Log the bindings */
4346         for_each_present_cpu(cpu) {
4347                 memset(cpu_list, 0, sizeof(cpu_list));
4348                 for (i = 0, j = 0; i < MTIP_MAX_SLOT_GROUPS; i++) {
4349                         if (dd->work[i].cpu_binding == cpu) {
4350                                 snprintf(&cpu_list[j], 256 - j, "%d ", i);
4351                                 j = strlen(cpu_list);
4352                         }
4353                 }
4354                 if (j)
4355                         dev_info(&pdev->dev, "CPU %d: WQs %s\n", cpu, cpu_list);
4356         }
4357
4358         INIT_WORK(&dd->work[0].work, mtip_workq_sdbf0);
4359         INIT_WORK(&dd->work[1].work, mtip_workq_sdbf1);
4360         INIT_WORK(&dd->work[2].work, mtip_workq_sdbf2);
4361         INIT_WORK(&dd->work[3].work, mtip_workq_sdbf3);
4362         INIT_WORK(&dd->work[4].work, mtip_workq_sdbf4);
4363         INIT_WORK(&dd->work[5].work, mtip_workq_sdbf5);
4364         INIT_WORK(&dd->work[6].work, mtip_workq_sdbf6);
4365         INIT_WORK(&dd->work[7].work, mtip_workq_sdbf7);
4366
4367         pci_set_master(pdev);
4368         rv = pci_enable_msi(pdev);
4369         if (rv) {
4370                 dev_warn(&pdev->dev,
4371                         "Unable to enable MSI interrupt.\n");
4372                 goto msi_initialize_err;
4373         }
4374
4375         mtip_fix_ero_nosnoop(dd, pdev);
4376
4377         /* Initialize the block layer. */
4378         rv = mtip_block_initialize(dd);
4379         if (rv < 0) {
4380                 dev_err(&pdev->dev,
4381                         "Unable to initialize block layer\n");
4382                 goto block_initialize_err;
4383         }
4384
4385         /*
4386          * Increment the instance count so that each device has a unique
4387          * instance number.
4388          */
4389         instance++;
4390         if (rv != MTIP_FTL_REBUILD_MAGIC)
4391                 set_bit(MTIP_DDF_INIT_DONE_BIT, &dd->dd_flag);
4392         else
4393                 rv = 0; /* device in rebuild state, return 0 from probe */
4394
4395         /* Add to online list even if in ftl rebuild */
4396         spin_lock_irqsave(&dev_lock, flags);
4397         list_add(&dd->online_list, &online_list);
4398         spin_unlock_irqrestore(&dev_lock, flags);
4399
4400         goto done;
4401
4402 block_initialize_err:
4403         pci_disable_msi(pdev);
4404
4405 msi_initialize_err:
4406         if (dd->isr_workq) {
4407                 flush_workqueue(dd->isr_workq);
4408                 destroy_workqueue(dd->isr_workq);
4409                 drop_cpu(dd->work[0].cpu_binding);
4410                 drop_cpu(dd->work[1].cpu_binding);
4411                 drop_cpu(dd->work[2].cpu_binding);
4412         }
4413 setmask_err:
4414         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4415
4416 iomap_err:
4417         kfree(dd);
4418         pci_set_drvdata(pdev, NULL);
4419         return rv;
4420 done:
4421         return rv;
4422 }
4423
4424 /*
4425  * Called for each probed device when the device is removed or the
4426  * driver is unloaded.
4427  *
4428  * return value
4429  *      None
4430  */
4431 static void mtip_pci_remove(struct pci_dev *pdev)
4432 {
4433         struct driver_data *dd = pci_get_drvdata(pdev);
4434         unsigned long flags, to;
4435
4436         set_bit(MTIP_DDF_REMOVE_PENDING_BIT, &dd->dd_flag);
4437
4438         spin_lock_irqsave(&dev_lock, flags);
4439         list_del_init(&dd->online_list);
4440         list_add(&dd->remove_list, &removing_list);
4441         spin_unlock_irqrestore(&dev_lock, flags);
4442
4443         mtip_check_surprise_removal(pdev);
4444         synchronize_irq(dd->pdev->irq);
4445
4446         /* Spin until workers are done */
4447         to = jiffies + msecs_to_jiffies(4000);
4448         do {
4449                 msleep(20);
4450         } while (atomic_read(&dd->irq_workers_active) != 0 &&
4451                 time_before(jiffies, to));
4452
4453         if (atomic_read(&dd->irq_workers_active) != 0) {
4454                 dev_warn(&dd->pdev->dev,
4455                         "Completion workers still active!\n");
4456         }
4457
4458         blk_mq_stop_hw_queues(dd->queue);
4459         /* Clean up the block layer. */
4460         mtip_block_remove(dd);
4461
4462         if (dd->isr_workq) {
4463                 flush_workqueue(dd->isr_workq);
4464                 destroy_workqueue(dd->isr_workq);
4465                 drop_cpu(dd->work[0].cpu_binding);
4466                 drop_cpu(dd->work[1].cpu_binding);
4467                 drop_cpu(dd->work[2].cpu_binding);
4468         }
4469
4470         pci_disable_msi(pdev);
4471
4472         spin_lock_irqsave(&dev_lock, flags);
4473         list_del_init(&dd->remove_list);
4474         spin_unlock_irqrestore(&dev_lock, flags);
4475
4476         kfree(dd);
4477
4478         pcim_iounmap_regions(pdev, 1 << MTIP_ABAR);
4479         pci_set_drvdata(pdev, NULL);
4480 }
4481
4482 /*
4483  * Called for each probed device when the device is suspended.
4484  *
4485  * return value
4486  *      0  Success
4487  *      <0 Error
4488  */
4489 static int mtip_pci_suspend(struct pci_dev *pdev, pm_message_t mesg)
4490 {
4491         int rv = 0;
4492         struct driver_data *dd = pci_get_drvdata(pdev);
4493
4494         if (!dd) {
4495                 dev_err(&pdev->dev,
4496                         "Driver private datastructure is NULL\n");
4497                 return -EFAULT;
4498         }
4499
4500         set_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4501
4502         /* Disable ports & interrupts then send standby immediate */
4503         rv = mtip_block_suspend(dd);
4504         if (rv < 0) {
4505                 dev_err(&pdev->dev,
4506                         "Failed to suspend controller\n");
4507                 return rv;
4508         }
4509
4510         /*
4511          * Save the pci config space to pdev structure &
4512          * disable the device
4513          */
4514         pci_save_state(pdev);
4515         pci_disable_device(pdev);
4516
4517         /* Move to Low power state*/
4518         pci_set_power_state(pdev, PCI_D3hot);
4519
4520         return rv;
4521 }
4522
4523 /*
4524  * Called for each probed device when the device is resumed.
4525  *
4526  * return value
4527  *      0  Success
4528  *      <0 Error
4529  */
4530 static int mtip_pci_resume(struct pci_dev *pdev)
4531 {
4532         int rv = 0;
4533         struct driver_data *dd;
4534
4535         dd = pci_get_drvdata(pdev);
4536         if (!dd) {
4537                 dev_err(&pdev->dev,
4538                         "Driver private datastructure is NULL\n");
4539                 return -EFAULT;
4540         }
4541
4542         /* Move the device to active State */
4543         pci_set_power_state(pdev, PCI_D0);
4544
4545         /* Restore PCI configuration space */
4546         pci_restore_state(pdev);
4547
4548         /* Enable the PCI device*/
4549         rv = pcim_enable_device(pdev);
4550         if (rv < 0) {
4551                 dev_err(&pdev->dev,
4552                         "Failed to enable card during resume\n");
4553                 goto err;
4554         }
4555         pci_set_master(pdev);
4556
4557         /*
4558          * Calls hbaReset, initPort, & startPort function
4559          * then enables interrupts
4560          */
4561         rv = mtip_block_resume(dd);
4562         if (rv < 0)
4563                 dev_err(&pdev->dev, "Unable to resume\n");
4564
4565 err:
4566         clear_bit(MTIP_DDF_RESUME_BIT, &dd->dd_flag);
4567
4568         return rv;
4569 }
4570
4571 /*
4572  * Shutdown routine
4573  *
4574  * return value
4575  *      None
4576  */
4577 static void mtip_pci_shutdown(struct pci_dev *pdev)
4578 {
4579         struct driver_data *dd = pci_get_drvdata(pdev);
4580         if (dd)
4581                 mtip_block_shutdown(dd);
4582 }
4583
4584 /* Table of device ids supported by this driver. */
4585 static const struct pci_device_id mtip_pci_tbl[] = {
4586         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320H_DEVICE_ID) },
4587         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320M_DEVICE_ID) },
4588         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P320S_DEVICE_ID) },
4589         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P325M_DEVICE_ID) },
4590         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420H_DEVICE_ID) },
4591         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P420M_DEVICE_ID) },
4592         { PCI_DEVICE(PCI_VENDOR_ID_MICRON, P425M_DEVICE_ID) },
4593         { 0 }
4594 };
4595
4596 /* Structure that describes the PCI driver functions. */
4597 static struct pci_driver mtip_pci_driver = {
4598         .name                   = MTIP_DRV_NAME,
4599         .id_table               = mtip_pci_tbl,
4600         .probe                  = mtip_pci_probe,
4601         .remove                 = mtip_pci_remove,
4602         .suspend                = mtip_pci_suspend,
4603         .resume                 = mtip_pci_resume,
4604         .shutdown               = mtip_pci_shutdown,
4605 };
4606
4607 MODULE_DEVICE_TABLE(pci, mtip_pci_tbl);
4608
4609 /*
4610  * Module initialization function.
4611  *
4612  * Called once when the module is loaded. This function allocates a major
4613  * block device number to the Cyclone devices and registers the PCI layer
4614  * of the driver.
4615  *
4616  * Return value
4617  *      0 on success else error code.
4618  */
4619 static int __init mtip_init(void)
4620 {
4621         int error;
4622
4623         pr_info(MTIP_DRV_NAME " Version " MTIP_DRV_VERSION "\n");
4624
4625         spin_lock_init(&dev_lock);
4626
4627         INIT_LIST_HEAD(&online_list);
4628         INIT_LIST_HEAD(&removing_list);
4629
4630         /* Allocate a major block device number to use with this driver. */
4631         error = register_blkdev(0, MTIP_DRV_NAME);
4632         if (error <= 0) {
4633                 pr_err("Unable to register block device (%d)\n",
4634                 error);
4635                 return -EBUSY;
4636         }
4637         mtip_major = error;
4638
4639         dfs_parent = debugfs_create_dir("rssd", NULL);
4640         if (IS_ERR_OR_NULL(dfs_parent)) {
4641                 pr_warn("Error creating debugfs parent\n");
4642                 dfs_parent = NULL;
4643         }
4644         if (dfs_parent) {
4645                 dfs_device_status = debugfs_create_file("device_status",
4646                                         S_IRUGO, dfs_parent, NULL,
4647                                         &mtip_device_status_fops);
4648                 if (IS_ERR_OR_NULL(dfs_device_status)) {
4649                         pr_err("Error creating device_status node\n");
4650                         dfs_device_status = NULL;
4651                 }
4652         }
4653
4654         /* Register our PCI operations. */
4655         error = pci_register_driver(&mtip_pci_driver);
4656         if (error) {
4657                 debugfs_remove(dfs_parent);
4658                 unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4659         }
4660
4661         return error;
4662 }
4663
4664 /*
4665  * Module de-initialization function.
4666  *
4667  * Called once when the module is unloaded. This function deallocates
4668  * the major block device number allocated by mtip_init() and
4669  * unregisters the PCI layer of the driver.
4670  *
4671  * Return value
4672  *      none
4673  */
4674 static void __exit mtip_exit(void)
4675 {
4676         /* Release the allocated major block device number. */
4677         unregister_blkdev(mtip_major, MTIP_DRV_NAME);
4678
4679         /* Unregister the PCI driver. */
4680         pci_unregister_driver(&mtip_pci_driver);
4681
4682         debugfs_remove_recursive(dfs_parent);
4683 }
4684
4685 MODULE_AUTHOR("Micron Technology, Inc");
4686 MODULE_DESCRIPTION("Micron RealSSD PCIe Block Driver");
4687 MODULE_LICENSE("GPL");
4688 MODULE_VERSION(MTIP_DRV_VERSION);
4689
4690 module_init(mtip_init);
4691 module_exit(mtip_exit);