drivers/mmc/card/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/mutex.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/string_helpers.h>
  34 #include <linux/delay.h>
  35 #include <linux/capability.h>
  36 #include <linux/compat.h>
  37 #include <linux/pm_runtime.h>
  38
  39 #include <linux/mmc/ioctl.h>
  40 #include <linux/mmc/card.h>
  41 #include <linux/mmc/host.h>
  42 #include <linux/mmc/mmc.h>
  43 #include <linux/mmc/sd.h>
  44
  45 #include <asm/uaccess.h>
  46
  47 #include "queue.h"
  48
  49 MODULE_ALIAS("mmc:block");
  50
  51 #ifdef KERNEL
  52 #ifdef MODULE_PARAM_PREFIX
  53 #undef MODULE_PARAM_PREFIX
  54 #endif
  55 #define MODULE_PARAM_PREFIX "mmcblk."
  56 #endif
  57
  58 #define INAND_CMD38_ARG_EXT_CSD  113
  59 #define INAND_CMD38_ARG_ERASE    0x00
  60 #define INAND_CMD38_ARG_TRIM     0x01
  61 #define INAND_CMD38_ARG_SECERASE 0x80
  62 #define INAND_CMD38_ARG_SECTRIM1 0x81
  63 #define INAND_CMD38_ARG_SECTRIM2 0x88
  64 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  65 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  66 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  67
  68 #define mmc_req_rel_wr(req)     ((req->cmd_flags & REQ_FUA) && \
  69                                   (rq_data_dir(req) == WRITE))
  70 #define PACKED_CMD_VER  0x01
  71 #define PACKED_CMD_WR   0x02
  72
  73 static DEFINE_MUTEX(block_mutex);
  74
  75 /*
  76  * The defaults come from config options but can be overriden by module
  77  * or bootarg options.
  78  */
  79 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  80
  81 /*
  82  * We've only got one major, so number of mmcblk devices is
  83  * limited to (1 << 20) / number of minors per device.  It is also
  84  * currently limited by the size of the static bitmaps below.
  85  */
  86 static int max_devices;
  87
  88 #define MAX_DEVICES 256
  89
  90 /* TODO: Replace these with struct ida */
  91 static DECLARE_BITMAP(dev_use, MAX_DEVICES);
  92 static DECLARE_BITMAP(name_use, MAX_DEVICES);
  93
  94 /*
  95  * There is one mmc_blk_data per slot.
  96  */
  97 struct mmc_blk_data {
  98         spinlock_t      lock;
  99         struct gendisk  *disk;
 100         struct mmc_queue queue;
 101         struct list_head part;
 102
 103         unsigned int    flags;
 104 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
 105 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
 106 #define MMC_BLK_PACKED_CMD      (1 << 2)        /* MMC packed command support */
 107
 108         unsigned int    usage;
 109         unsigned int    read_only;
 110         unsigned int    part_type;
 111         unsigned int    name_idx;
 112         unsigned int    reset_done;
 113 #define MMC_BLK_READ            BIT(0)
 114 #define MMC_BLK_WRITE           BIT(1)
 115 #define MMC_BLK_DISCARD         BIT(2)
 116 #define MMC_BLK_SECDISCARD      BIT(3)
 117
 118         /*
 119          * Only set in main mmc_blk_data associated
 120          * with mmc_card with dev_set_drvdata, and keeps
 121          * track of the current selected device partition.
 122          */
 123         unsigned int    part_curr;
 124         struct device_attribute force_ro;
 125         struct device_attribute power_ro_lock;
 126         int     area_type;
 127 };
 128
 129 static DEFINE_MUTEX(open_lock);
 130
 131 enum {
 132         MMC_PACKED_NR_IDX = -1,
 133         MMC_PACKED_NR_ZERO,
 134         MMC_PACKED_NR_SINGLE,
 135 };
 136
 137 module_param(perdev_minors, int, 0444);
 138 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 139
 140 static inline int mmc_blk_part_switch(struct mmc_card *card,
 141                                       struct mmc_blk_data *md);
 142 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 143
 144 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 145 {
 146         struct mmc_packed *packed = mqrq->packed;
 147
 148         BUG_ON(!packed);
 149
 150         mqrq->cmd_type = MMC_PACKED_NONE;
 151         packed->nr_entries = MMC_PACKED_NR_ZERO;
 152         packed->idx_failure = MMC_PACKED_NR_IDX;
 153         packed->retries = 0;
 154         packed->blocks = 0;
 155 }
 156
 157 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 158 {
 159         struct mmc_blk_data *md;
 160
 161         mutex_lock(&open_lock);
 162         md = disk->private_data;
 163         if (md && md->usage == 0)
 164                 md = NULL;
 165         if (md)
 166                 md->usage++;
 167         mutex_unlock(&open_lock);
 168
 169         return md;
 170 }
 171
 172 static inline int mmc_get_devidx(struct gendisk *disk)
 173 {
 174         int devidx = disk->first_minor / perdev_minors;
 175         return devidx;
 176 }
 177
 178 static void mmc_blk_put(struct mmc_blk_data *md)
 179 {
 180         mutex_lock(&open_lock);
 181         md->usage--;
 182         if (md->usage == 0) {
 183                 int devidx = mmc_get_devidx(md->disk);
 184                 blk_cleanup_queue(md->queue.queue);
 185
 186                 __clear_bit(devidx, dev_use);
 187
 188                 put_disk(md->disk);
 189                 kfree(md);
 190         }
 191         mutex_unlock(&open_lock);
 192 }
 193
 194 static ssize_t power_ro_lock_show(struct device *dev,
 195                 struct device_attribute *attr, char *buf)
 196 {
 197         int ret;
 198         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 199         struct mmc_card *card = md->queue.card;
 200         int locked = 0;
 201
 202         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 203                 locked = 2;
 204         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 205                 locked = 1;
 206
 207         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 208
 209         mmc_blk_put(md);
 210
 211         return ret;
 212 }
 213
 214 static ssize_t power_ro_lock_store(struct device *dev,
 215                 struct device_attribute *attr, const char *buf, size_t count)
 216 {
 217         int ret;
 218         struct mmc_blk_data *md, *part_md;
 219         struct mmc_card *card;
 220         unsigned long set;
 221
 222         if (kstrtoul(buf, 0, &set))
 223                 return -EINVAL;
 224
 225         if (set != 1)
 226                 return count;
 227
 228         md = mmc_blk_get(dev_to_disk(dev));
 229         card = md->queue.card;
 230
 231         mmc_get_card(card);
 232
 233         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 234                                 card->ext_csd.boot_ro_lock |
 235                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 236                                 card->ext_csd.part_time);
 237         if (ret)
 238                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 239         else
 240                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 241
 242         mmc_put_card(card);
 243
 244         if (!ret) {
 245                 pr_info("%s: Locking boot partition ro until next power on\n",
 246                         md->disk->disk_name);
 247                 set_disk_ro(md->disk, 1);
 248
 249                 list_for_each_entry(part_md, &md->part, part)
 250                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 251                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 252                                 set_disk_ro(part_md->disk, 1);
 253                         }
 254         }
 255
 256         mmc_blk_put(md);
 257         return count;
 258 }
 259
 260 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 261                              char *buf)
 262 {
 263         int ret;
 264         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 265
 266         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 267                        get_disk_ro(dev_to_disk(dev)) ^
 268                        md->read_only);
 269         mmc_blk_put(md);
 270         return ret;
 271 }
 272
 273 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 274                               const char *buf, size_t count)
 275 {
 276         int ret;
 277         char *end;
 278         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 279         unsigned long set = simple_strtoul(buf, &end, 0);
 280         if (end == buf) {
 281                 ret = -EINVAL;
 282                 goto out;
 283         }
 284
 285         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 286         ret = count;
 287 out:
 288         mmc_blk_put(md);
 289         return ret;
 290 }
 291
 292 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 293 {
 294         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 295         int ret = -ENXIO;
 296
 297         mutex_lock(&block_mutex);
 298         if (md) {
 299                 if (md->usage == 2)
 300                         check_disk_change(bdev);
 301                 ret = 0;
 302
 303                 if ((mode & FMODE_WRITE) && md->read_only) {
 304                         mmc_blk_put(md);
 305                         ret = -EROFS;
 306                 }
 307         }
 308         mutex_unlock(&block_mutex);
 309
 310         return ret;
 311 }
 312
 313 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 314 {
 315         struct mmc_blk_data *md = disk->private_data;
 316
 317         mutex_lock(&block_mutex);
 318         mmc_blk_put(md);
 319         mutex_unlock(&block_mutex);
 320 }
 321
 322 static int
 323 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 324 {
 325         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 326         geo->heads = 4;
 327         geo->sectors = 16;
 328         return 0;
 329 }
 330
 331 struct mmc_blk_ioc_data {
 332         struct mmc_ioc_cmd ic;
 333         unsigned char *buf;
 334         u64 buf_bytes;
 335 };
 336
 337 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 338         struct mmc_ioc_cmd __user *user)
 339 {
 340         struct mmc_blk_ioc_data *idata;
 341         int err;
 342
 343         idata = kzalloc(sizeof(*idata), GFP_KERNEL);
 344         if (!idata) {
 345                 err = -ENOMEM;
 346                 goto out;
 347         }
 348
 349         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 350                 err = -EFAULT;
 351                 goto idata_err;
 352         }
 353
 354         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 355         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 356                 err = -EOVERFLOW;
 357                 goto idata_err;
 358         }
 359
 360         if (!idata->buf_bytes)
 361                 return idata;
 362
 363         idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
 364         if (!idata->buf) {
 365                 err = -ENOMEM;
 366                 goto idata_err;
 367         }
 368
 369         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 370                                         idata->ic.data_ptr, idata->buf_bytes)) {
 371                 err = -EFAULT;
 372                 goto copy_err;
 373         }
 374
 375         return idata;
 376
 377 copy_err:
 378         kfree(idata->buf);
 379 idata_err:
 380         kfree(idata);
 381 out:
 382         return ERR_PTR(err);
 383 }
 384
 385 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
 386                                       struct mmc_blk_ioc_data *idata)
 387 {
 388         struct mmc_ioc_cmd *ic = &idata->ic;
 389
 390         if (copy_to_user(&(ic_ptr->response), ic->response,
 391                          sizeof(ic->response)))
 392                 return -EFAULT;
 393
 394         if (!idata->ic.write_flag) {
 395                 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
 396                                  idata->buf, idata->buf_bytes))
 397                         return -EFAULT;
 398         }
 399
 400         return 0;
 401 }
 402
 403 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 404                                        u32 retries_max)
 405 {
 406         int err;
 407         u32 retry_count = 0;
 408
 409         if (!status || !retries_max)
 410                 return -EINVAL;
 411
 412         do {
 413                 err = get_card_status(card, status, 5);
 414                 if (err)
 415                         break;
 416
 417                 if (!R1_STATUS(*status) &&
 418                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 419                         break; /* RPMB programming operation complete */
 420
 421                 /*
 422                  * Rechedule to give the MMC device a chance to continue
 423                  * processing the previous command without being polled too
 424                  * frequently.
 425                  */
 426                 usleep_range(1000, 5000);
 427         } while (++retry_count < retries_max);
 428
 429         if (retry_count == retries_max)
 430                 err = -EPERM;
 431
 432         return err;
 433 }
 434
 435 static int ioctl_do_sanitize(struct mmc_card *card)
 436 {
 437         int err;
 438
 439         if (!mmc_can_sanitize(card)) {
 440                         pr_warn("%s: %s - SANITIZE is not supported\n",
 441                                 mmc_hostname(card->host), __func__);
 442                         err = -EOPNOTSUPP;
 443                         goto out;
 444         }
 445
 446         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 447                 mmc_hostname(card->host), __func__);
 448
 449         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 450                                         EXT_CSD_SANITIZE_START, 1,
 451                                         MMC_SANITIZE_REQ_TIMEOUT);
 452
 453         if (err)
 454                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 455                        mmc_hostname(card->host), __func__, err);
 456
 457         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 458                                              __func__);
 459 out:
 460         return err;
 461 }
 462
 463 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 464                                struct mmc_blk_ioc_data *idata)
 465 {
 466         struct mmc_command cmd = {0};
 467         struct mmc_data data = {0};
 468         struct mmc_request mrq = {NULL};
 469         struct scatterlist sg;
 470         int err;
 471         int is_rpmb = false;
 472         u32 status = 0;
 473
 474         if (!card || !md || !idata)
 475                 return -EINVAL;
 476
 477         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 478                 is_rpmb = true;
 479
 480         cmd.opcode = idata->ic.opcode;
 481         cmd.arg = idata->ic.arg;
 482         cmd.flags = idata->ic.flags;
 483
 484         if (idata->buf_bytes) {
 485                 data.sg = &sg;
 486                 data.sg_len = 1;
 487                 data.blksz = idata->ic.blksz;
 488                 data.blocks = idata->ic.blocks;
 489
 490                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 491
 492                 if (idata->ic.write_flag)
 493                         data.flags = MMC_DATA_WRITE;
 494                 else
 495                         data.flags = MMC_DATA_READ;
 496
 497                 /* data.flags must already be set before doing this. */
 498                 mmc_set_data_timeout(&data, card);
 499
 500                 /* Allow overriding the timeout_ns for empirical tuning. */
 501                 if (idata->ic.data_timeout_ns)
 502                         data.timeout_ns = idata->ic.data_timeout_ns;
 503
 504                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 505                         /*
 506                          * Pretend this is a data transfer and rely on the
 507                          * host driver to compute timeout.  When all host
 508                          * drivers support cmd.cmd_timeout for R1B, this
 509                          * can be changed to:
 510                          *
 511                          *     mrq.data = NULL;
 512                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 513                          */
 514                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 515                 }
 516
 517                 mrq.data = &data;
 518         }
 519
 520         mrq.cmd = &cmd;
 521
 522         err = mmc_blk_part_switch(card, md);
 523         if (err)
 524                 return err;
 525
 526         if (idata->ic.is_acmd) {
 527                 err = mmc_app_cmd(card->host, card);
 528                 if (err)
 529                         return err;
 530         }
 531
 532         if (is_rpmb) {
 533                 err = mmc_set_blockcount(card, data.blocks,
 534                         idata->ic.write_flag & (1 << 31));
 535                 if (err)
 536                         return err;
 537         }
 538
 539         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 540             (cmd.opcode == MMC_SWITCH)) {
 541                 err = ioctl_do_sanitize(card);
 542
 543                 if (err)
 544                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 545                                __func__, err);
 546
 547                 return err;
 548         }
 549
 550         mmc_wait_for_req(card->host, &mrq);
 551
 552         if (cmd.error) {
 553                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 554                                                 __func__, cmd.error);
 555                 return cmd.error;
 556         }
 557         if (data.error) {
 558                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 559                                                 __func__, data.error);
 560                 return data.error;
 561         }
 562
 563         /*
 564          * According to the SD specs, some commands require a delay after
 565          * issuing the command.
 566          */
 567         if (idata->ic.postsleep_min_us)
 568                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 569
 570         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
 571
 572         if (is_rpmb) {
 573                 /*
 574                  * Ensure RPMB command has completed by polling CMD13
 575                  * "Send Status".
 576                  */
 577                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 578                 if (err)
 579                         dev_err(mmc_dev(card->host),
 580                                         "%s: Card Status=0x%08X, error %d\n",
 581                                         __func__, status, err);
 582         }
 583
 584         return err;
 585 }
 586
 587 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 588                              struct mmc_ioc_cmd __user *ic_ptr)
 589 {
 590         struct mmc_blk_ioc_data *idata;
 591         struct mmc_blk_data *md;
 592         struct mmc_card *card;
 593         int err = 0, ioc_err = 0;
 594
 595         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 596         if (IS_ERR(idata))
 597                 return PTR_ERR(idata);
 598
 599         md = mmc_blk_get(bdev->bd_disk);
 600         if (!md) {
 601                 err = -EINVAL;
 602                 goto cmd_err;
 603         }
 604
 605         card = md->queue.card;
 606         if (IS_ERR(card)) {
 607                 err = PTR_ERR(card);
 608                 goto cmd_done;
 609         }
 610
 611         mmc_get_card(card);
 612
 613         ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
 614
 615         mmc_put_card(card);
 616
 617         err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
 618
 619 cmd_done:
 620         mmc_blk_put(md);
 621 cmd_err:
 622         kfree(idata->buf);
 623         kfree(idata);
 624         return ioc_err ? ioc_err : err;
 625 }
 626
 627 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 628                                    struct mmc_ioc_multi_cmd __user *user)
 629 {
 630         struct mmc_blk_ioc_data **idata = NULL;
 631         struct mmc_ioc_cmd __user *cmds = user->cmds;
 632         struct mmc_card *card;
 633         struct mmc_blk_data *md;
 634         int i, err = 0, ioc_err = 0;
 635         __u64 num_of_cmds;
 636
 637         if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
 638                            sizeof(num_of_cmds)))
 639                 return -EFAULT;
 640
 641         if (num_of_cmds > MMC_IOC_MAX_CMDS)
 642                 return -EINVAL;
 643
 644         idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
 645         if (!idata)
 646                 return -ENOMEM;
 647
 648         for (i = 0; i < num_of_cmds; i++) {
 649                 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
 650                 if (IS_ERR(idata[i])) {
 651                         err = PTR_ERR(idata[i]);
 652                         num_of_cmds = i;
 653                         goto cmd_err;
 654                 }
 655         }
 656
 657         md = mmc_blk_get(bdev->bd_disk);
 658         if (!md)
 659                 goto cmd_err;
 660
 661         card = md->queue.card;
 662         if (IS_ERR(card)) {
 663                 err = PTR_ERR(card);
 664                 goto cmd_done;
 665         }
 666
 667         mmc_get_card(card);
 668
 669         for (i = 0; i < num_of_cmds && !ioc_err; i++)
 670                 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 671
 672         mmc_put_card(card);
 673
 674         /* copy to user if data and response */
 675         for (i = 0; i < num_of_cmds && !err; i++)
 676                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 677
 678 cmd_done:
 679         mmc_blk_put(md);
 680 cmd_err:
 681         for (i = 0; i < num_of_cmds; i++) {
 682                 kfree(idata[i]->buf);
 683                 kfree(idata[i]);
 684         }
 685         kfree(idata);
 686         return ioc_err ? ioc_err : err;
 687 }
 688
 689 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 690         unsigned int cmd, unsigned long arg)
 691 {
 692         /*
 693          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 694          * whole block device, not on a partition.  This prevents overspray
 695          * between sibling partitions.
 696          */
 697         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 698                 return -EPERM;
 699
 700         switch (cmd) {
 701         case MMC_IOC_CMD:
 702                 return mmc_blk_ioctl_cmd(bdev,
 703                                 (struct mmc_ioc_cmd __user *)arg);
 704         case MMC_IOC_MULTI_CMD:
 705                 return mmc_blk_ioctl_multi_cmd(bdev,
 706                                 (struct mmc_ioc_multi_cmd __user *)arg);
 707         default:
 708                 return -EINVAL;
 709         }
 710 }
 711
 712 #ifdef CONFIG_COMPAT
 713 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 714         unsigned int cmd, unsigned long arg)
 715 {
 716         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 717 }
 718 #endif
 719
 720 static const struct block_device_operations mmc_bdops = {
 721         .open                   = mmc_blk_open,
 722         .release                = mmc_blk_release,
 723         .getgeo                 = mmc_blk_getgeo,
 724         .owner                  = THIS_MODULE,
 725         .ioctl                  = mmc_blk_ioctl,
 726 #ifdef CONFIG_COMPAT
 727         .compat_ioctl           = mmc_blk_compat_ioctl,
 728 #endif
 729 };
 730
 731 static inline int mmc_blk_part_switch(struct mmc_card *card,
 732                                       struct mmc_blk_data *md)
 733 {
 734         int ret;
 735         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 736
 737         if (main_md->part_curr == md->part_type)
 738                 return 0;
 739
 740         if (mmc_card_mmc(card)) {
 741                 u8 part_config = card->ext_csd.part_config;
 742
 743                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 744                 part_config |= md->part_type;
 745
 746                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 747                                  EXT_CSD_PART_CONFIG, part_config,
 748                                  card->ext_csd.part_time);
 749                 if (ret)
 750                         return ret;
 751
 752                 card->ext_csd.part_config = part_config;
 753         }
 754
 755         main_md->part_curr = md->part_type;
 756         return 0;
 757 }
 758
 759 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 760 {
 761         int err;
 762         u32 result;
 763         __be32 *blocks;
 764
 765         struct mmc_request mrq = {NULL};
 766         struct mmc_command cmd = {0};
 767         struct mmc_data data = {0};
 768
 769         struct scatterlist sg;
 770
 771         cmd.opcode = MMC_APP_CMD;
 772         cmd.arg = card->rca << 16;
 773         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 774
 775         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 776         if (err)
 777                 return (u32)-1;
 778         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 779                 return (u32)-1;
 780
 781         memset(&cmd, 0, sizeof(struct mmc_command));
 782
 783         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 784         cmd.arg = 0;
 785         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 786
 787         data.blksz = 4;
 788         data.blocks = 1;
 789         data.flags = MMC_DATA_READ;
 790         data.sg = &sg;
 791         data.sg_len = 1;
 792         mmc_set_data_timeout(&data, card);
 793
 794         mrq.cmd = &cmd;
 795         mrq.data = &data;
 796
 797         blocks = kmalloc(4, GFP_KERNEL);
 798         if (!blocks)
 799                 return (u32)-1;
 800
 801         sg_init_one(&sg, blocks, 4);
 802
 803         mmc_wait_for_req(card->host, &mrq);
 804
 805         result = ntohl(*blocks);
 806         kfree(blocks);
 807
 808         if (cmd.error || data.error)
 809                 result = (u32)-1;
 810
 811         return result;
 812 }
 813
 814 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 815 {
 816         struct mmc_command cmd = {0};
 817         int err;
 818
 819         cmd.opcode = MMC_SEND_STATUS;
 820         if (!mmc_host_is_spi(card->host))
 821                 cmd.arg = card->rca << 16;
 822         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 823         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 824         if (err == 0)
 825                 *status = cmd.resp[0];
 826         return err;
 827 }
 828
 829 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 830                 bool hw_busy_detect, struct request *req, int *gen_err)
 831 {
 832         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 833         int err = 0;
 834         u32 status;
 835
 836         do {
 837                 err = get_card_status(card, &status, 5);
 838                 if (err) {
 839                         pr_err("%s: error %d requesting status\n",
 840                                req->rq_disk->disk_name, err);
 841                         return err;
 842                 }
 843
 844                 if (status & R1_ERROR) {
 845                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 846                                 req->rq_disk->disk_name, __func__, status);
 847                         *gen_err = 1;
 848                 }
 849
 850                 /* We may rely on the host hw to handle busy detection.*/
 851                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 852                         hw_busy_detect)
 853                         break;
 854
 855                 /*
 856                  * Timeout if the device never becomes ready for data and never
 857                  * leaves the program state.
 858                  */
 859                 if (time_after(jiffies, timeout)) {
 860                         pr_err("%s: Card stuck in programming state! %s %s\n",
 861                                 mmc_hostname(card->host),
 862                                 req->rq_disk->disk_name, __func__);
 863                         return -ETIMEDOUT;
 864                 }
 865
 866                 /*
 867                  * Some cards mishandle the status bits,
 868                  * so make sure to check both the busy
 869                  * indication and the card state.
 870                  */
 871         } while (!(status & R1_READY_FOR_DATA) ||
 872                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 873
 874         return err;
 875 }
 876
 877 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 878                 struct request *req, int *gen_err, u32 *stop_status)
 879 {
 880         struct mmc_host *host = card->host;
 881         struct mmc_command cmd = {0};
 882         int err;
 883         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 884
 885         /*
 886          * Normally we use R1B responses for WRITE, but in cases where the host
 887          * has specified a max_busy_timeout we need to validate it. A failure
 888          * means we need to prevent the host from doing hw busy detection, which
 889          * is done by converting to a R1 response instead.
 890          */
 891         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 892                 use_r1b_resp = false;
 893
 894         cmd.opcode = MMC_STOP_TRANSMISSION;
 895         if (use_r1b_resp) {
 896                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 897                 cmd.busy_timeout = timeout_ms;
 898         } else {
 899                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 900         }
 901
 902         err = mmc_wait_for_cmd(host, &cmd, 5);
 903         if (err)
 904                 return err;
 905
 906         *stop_status = cmd.resp[0];
 907
 908         /* No need to check card status in case of READ. */
 909         if (rq_data_dir(req) == READ)
 910                 return 0;
 911
 912         if (!mmc_host_is_spi(host) &&
 913                 (*stop_status & R1_ERROR)) {
 914                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 915                         req->rq_disk->disk_name, __func__, *stop_status);
 916                 *gen_err = 1;
 917         }
 918
 919         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 920 }
 921
 922 #define ERR_NOMEDIUM    3
 923 #define ERR_RETRY       2
 924 #define ERR_ABORT       1
 925 #define ERR_CONTINUE    0
 926
 927 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 928         bool status_valid, u32 status)
 929 {
 930         switch (error) {
 931         case -EILSEQ:
 932                 /* response crc error, retry the r/w cmd */
 933                 pr_err("%s: %s sending %s command, card status %#x\n",
 934                         req->rq_disk->disk_name, "response CRC error",
 935                         name, status);
 936                 return ERR_RETRY;
 937
 938         case -ETIMEDOUT:
 939                 pr_err("%s: %s sending %s command, card status %#x\n",
 940                         req->rq_disk->disk_name, "timed out", name, status);
 941
 942                 /* If the status cmd initially failed, retry the r/w cmd */
 943                 if (!status_valid) {
 944                         pr_err("%s: status not valid, retrying timeout\n", req->rq_disk->disk_name);
 945                         return ERR_RETRY;
 946                 }
 947                 /*
 948                  * If it was a r/w cmd crc error, or illegal command
 949                  * (eg, issued in wrong state) then retry - we should
 950                  * have corrected the state problem above.
 951                  */
 952                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
 953                         pr_err("%s: command error, retrying timeout\n", req->rq_disk->disk_name);
 954                         return ERR_RETRY;
 955                 }
 956
 957                 /* Otherwise abort the command */
 958                 pr_err("%s: not retrying timeout\n", req->rq_disk->disk_name);
 959                 return ERR_ABORT;
 960
 961         default:
 962                 /* We don't understand the error code the driver gave us */
 963                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 964                        req->rq_disk->disk_name, error, status);
 965                 return ERR_ABORT;
 966         }
 967 }
 968
 969 /*
 970  * Initial r/w and stop cmd error recovery.
 971  * We don't know whether the card received the r/w cmd or not, so try to
 972  * restore things back to a sane state.  Essentially, we do this as follows:
 973  * - Obtain card status.  If the first attempt to obtain card status fails,
 974  *   the status word will reflect the failed status cmd, not the failed
 975  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 976  *   longer communicate with the card.
 977  * - Check the card state.  If the card received the cmd but there was a
 978  *   transient problem with the response, it might still be in a data transfer
 979  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 980  * - If the r/w cmd failed due to a response CRC error, it was probably
 981  *   transient, so retry the cmd.
 982  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 983  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 984  *   illegal cmd, retry.
 985  * Otherwise we don't understand what happened, so abort.
 986  */
 987 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 988         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 989 {
 990         bool prev_cmd_status_valid = true;
 991         u32 status, stop_status = 0;
 992         int err, retry;
 993
 994         if (mmc_card_removed(card))
 995                 return ERR_NOMEDIUM;
 996
 997         /*
 998          * Try to get card status which indicates both the card state
 999          * and why there was no response.  If the first attempt fails,
1000          * we can't be sure the returned status is for the r/w command.
1001          */
1002         for (retry = 2; retry >= 0; retry--) {
1003                 err = get_card_status(card, &status, 0);
1004                 if (!err)
1005                         break;
1006
1007                 /* Re-tune if needed */
1008                 mmc_retune_recheck(card->host);
1009
1010                 prev_cmd_status_valid = false;
1011                 pr_err("%s: error %d sending status command, %sing\n",
1012                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1013         }
1014
1015         /* We couldn't get a response from the card.  Give up. */
1016         if (err) {
1017                 /* Check if the card is removed */
1018                 if (mmc_detect_card_removed(card->host))
1019                         return ERR_NOMEDIUM;
1020                 return ERR_ABORT;
1021         }
1022
1023         /* Flag ECC errors */
1024         if ((status & R1_CARD_ECC_FAILED) ||
1025             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1026             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1027                 *ecc_err = 1;
1028
1029         /* Flag General errors */
1030         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1031                 if ((status & R1_ERROR) ||
1032                         (brq->stop.resp[0] & R1_ERROR)) {
1033                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1034                                req->rq_disk->disk_name, __func__,
1035                                brq->stop.resp[0], status);
1036                         *gen_err = 1;
1037                 }
1038
1039         /*
1040          * Check the current card state.  If it is in some data transfer
1041          * mode, tell it to stop (and hopefully transition back to TRAN.)
1042          */
1043         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1044             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1045                 err = send_stop(card,
1046                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1047                         req, gen_err, &stop_status);
1048                 if (err) {
1049                         pr_err("%s: error %d sending stop command\n",
1050                                req->rq_disk->disk_name, err);
1051                         /*
1052                          * If the stop cmd also timed out, the card is probably
1053                          * not present, so abort. Other errors are bad news too.
1054                          */
1055                         return ERR_ABORT;
1056                 }
1057
1058                 if (stop_status & R1_CARD_ECC_FAILED)
1059                         *ecc_err = 1;
1060         }
1061
1062         /* Check for set block count errors */
1063         if (brq->sbc.error)
1064                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1065                                 prev_cmd_status_valid, status);
1066
1067         /* Check for r/w command errors */
1068         if (brq->cmd.error)
1069                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1070                                 prev_cmd_status_valid, status);
1071
1072         /* Data errors */
1073         if (!brq->stop.error)
1074                 return ERR_CONTINUE;
1075
1076         /* Now for stop errors.  These aren't fatal to the transfer. */
1077         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1078                req->rq_disk->disk_name, brq->stop.error,
1079                brq->cmd.resp[0], status);
1080
1081         /*
1082          * Subsitute in our own stop status as this will give the error
1083          * state which happened during the execution of the r/w command.
1084          */
1085         if (stop_status) {
1086                 brq->stop.resp[0] = stop_status;
1087                 brq->stop.error = 0;
1088         }
1089         return ERR_CONTINUE;
1090 }
1091
1092 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1093                          int type)
1094 {
1095         int err;
1096
1097         if (md->reset_done & type)
1098                 return -EEXIST;
1099
1100         md->reset_done |= type;
1101         err = mmc_hw_reset(host);
1102         /* Ensure we switch back to the correct partition */
1103         if (err != -EOPNOTSUPP) {
1104                 struct mmc_blk_data *main_md =
1105                         dev_get_drvdata(&host->card->dev);
1106                 int part_err;
1107
1108                 main_md->part_curr = main_md->part_type;
1109                 part_err = mmc_blk_part_switch(host->card, md);
1110                 if (part_err) {
1111                         /*
1112                          * We have failed to get back into the correct
1113                          * partition, so we need to abort the whole request.
1114                          */
1115                         return -ENODEV;
1116                 }
1117         }
1118         return err;
1119 }
1120
1121 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1122 {
1123         md->reset_done &= ~type;
1124 }
1125
1126 int mmc_access_rpmb(struct mmc_queue *mq)
1127 {
1128         struct mmc_blk_data *md = mq->data;
1129         /*
1130          * If this is a RPMB partition access, return ture
1131          */
1132         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1133                 return true;
1134
1135         return false;
1136 }
1137
1138 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1139 {
1140         struct mmc_blk_data *md = mq->data;
1141         struct mmc_card *card = md->queue.card;
1142         unsigned int from, nr, arg;
1143         int err = 0, type = MMC_BLK_DISCARD;
1144
1145         if (!mmc_can_erase(card)) {
1146                 err = -EOPNOTSUPP;
1147                 goto out;
1148         }
1149
1150         from = blk_rq_pos(req);
1151         nr = blk_rq_sectors(req);
1152
1153         if (mmc_can_discard(card))
1154                 arg = MMC_DISCARD_ARG;
1155         else if (mmc_can_trim(card))
1156                 arg = MMC_TRIM_ARG;
1157         else
1158                 arg = MMC_ERASE_ARG;
1159 retry:
1160         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1161                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1162                                  INAND_CMD38_ARG_EXT_CSD,
1163                                  arg == MMC_TRIM_ARG ?
1164                                  INAND_CMD38_ARG_TRIM :
1165                                  INAND_CMD38_ARG_ERASE,
1166                                  0);
1167                 if (err)
1168                         goto out;
1169         }
1170         err = mmc_erase(card, from, nr, arg);
1171 out:
1172         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1173                 goto retry;
1174         if (!err)
1175                 mmc_blk_reset_success(md, type);
1176         blk_end_request(req, err, blk_rq_bytes(req));
1177
1178         return err ? 0 : 1;
1179 }
1180
1181 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1182                                        struct request *req)
1183 {
1184         struct mmc_blk_data *md = mq->data;
1185         struct mmc_card *card = md->queue.card;
1186         unsigned int from, nr, arg;
1187         int err = 0, type = MMC_BLK_SECDISCARD;
1188
1189         if (!(mmc_can_secure_erase_trim(card))) {
1190                 err = -EOPNOTSUPP;
1191                 goto out;
1192         }
1193
1194         from = blk_rq_pos(req);
1195         nr = blk_rq_sectors(req);
1196
1197         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1198                 arg = MMC_SECURE_TRIM1_ARG;
1199         else
1200                 arg = MMC_SECURE_ERASE_ARG;
1201
1202 retry:
1203         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1204                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1205                                  INAND_CMD38_ARG_EXT_CSD,
1206                                  arg == MMC_SECURE_TRIM1_ARG ?
1207                                  INAND_CMD38_ARG_SECTRIM1 :
1208                                  INAND_CMD38_ARG_SECERASE,
1209                                  0);
1210                 if (err)
1211                         goto out_retry;
1212         }
1213
1214         err = mmc_erase(card, from, nr, arg);
1215         if (err == -EIO)
1216                 goto out_retry;
1217         if (err)
1218                 goto out;
1219
1220         if (arg == MMC_SECURE_TRIM1_ARG) {
1221                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1222                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1223                                          INAND_CMD38_ARG_EXT_CSD,
1224                                          INAND_CMD38_ARG_SECTRIM2,
1225                                          0);
1226                         if (err)
1227                                 goto out_retry;
1228                 }
1229
1230                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1231                 if (err == -EIO)
1232                         goto out_retry;
1233                 if (err)
1234                         goto out;
1235         }
1236
1237 out_retry:
1238         if (err && !mmc_blk_reset(md, card->host, type))
1239                 goto retry;
1240         if (!err)
1241                 mmc_blk_reset_success(md, type);
1242 out:
1243         blk_end_request(req, err, blk_rq_bytes(req));
1244
1245         return err ? 0 : 1;
1246 }
1247
1248 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1249 {
1250         struct mmc_blk_data *md = mq->data;
1251         struct mmc_card *card = md->queue.card;
1252         int ret = 0;
1253
1254         ret = mmc_flush_cache(card);
1255         if (ret)
1256                 ret = -EIO;
1257
1258         blk_end_request_all(req, ret);
1259
1260         return ret ? 0 : 1;
1261 }
1262
1263 /*
1264  * Reformat current write as a reliable write, supporting
1265  * both legacy and the enhanced reliable write MMC cards.
1266  * In each transfer we'll handle only as much as a single
1267  * reliable write can handle, thus finish the request in
1268  * partial completions.
1269  */
1270 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1271                                     struct mmc_card *card,
1272                                     struct request *req)
1273 {
1274         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1275                 /* Legacy mode imposes restrictions on transfers. */
1276                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1277                         brq->data.blocks = 1;
1278
1279                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1280                         brq->data.blocks = card->ext_csd.rel_sectors;
1281                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1282                         brq->data.blocks = 1;
1283         }
1284 }
1285
1286 #define CMD_ERRORS                                                      \
1287         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1288          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1289          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1290          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1291          R1_CC_ERROR |          /* Card controller error */             \
1292          R1_ERROR)              /* General/unknown error */
1293
1294 static int mmc_blk_err_check(struct mmc_card *card,
1295                              struct mmc_async_req *areq)
1296 {
1297         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1298                                                     mmc_active);
1299         struct mmc_blk_request *brq = &mq_mrq->brq;
1300         struct request *req = mq_mrq->req;
1301         int need_retune = card->host->need_retune;
1302         int ecc_err = 0, gen_err = 0;
1303
1304         /*
1305          * sbc.error indicates a problem with the set block count
1306          * command.  No data will have been transferred.
1307          *
1308          * cmd.error indicates a problem with the r/w command.  No
1309          * data will have been transferred.
1310          *
1311          * stop.error indicates a problem with the stop command.  Data
1312          * may have been transferred, or may still be transferring.
1313          */
1314         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1315             brq->data.error) {
1316                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1317                 case ERR_RETRY:
1318                         return MMC_BLK_RETRY;
1319                 case ERR_ABORT:
1320                         return MMC_BLK_ABORT;
1321                 case ERR_NOMEDIUM:
1322                         return MMC_BLK_NOMEDIUM;
1323                 case ERR_CONTINUE:
1324                         break;
1325                 }
1326         }
1327
1328         /*
1329          * Check for errors relating to the execution of the
1330          * initial command - such as address errors.  No data
1331          * has been transferred.
1332          */
1333         if (brq->cmd.resp[0] & CMD_ERRORS) {
1334                 pr_err("%s: r/w command failed, status = %#x\n",
1335                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1336                 return MMC_BLK_ABORT;
1337         }
1338
1339         /*
1340          * Everything else is either success, or a data error of some
1341          * kind.  If it was a write, we may have transitioned to
1342          * program mode, which we have to wait for it to complete.
1343          */
1344         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1345                 int err;
1346
1347                 /* Check stop command response */
1348                 if (brq->stop.resp[0] & R1_ERROR) {
1349                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1350                                req->rq_disk->disk_name, __func__,
1351                                brq->stop.resp[0]);
1352                         gen_err = 1;
1353                 }
1354
1355                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1356                                         &gen_err);
1357                 if (err)
1358                         return MMC_BLK_CMD_ERR;
1359         }
1360
1361         /* if general error occurs, retry the write operation. */
1362         if (gen_err) {
1363                 pr_warn("%s: retrying write for general error\n",
1364                                 req->rq_disk->disk_name);
1365                 return MMC_BLK_RETRY;
1366         }
1367
1368         if (brq->data.error) {
1369                 if (need_retune && !brq->retune_retry_done) {
1370                         pr_info("%s: retrying because a re-tune was needed\n",
1371                                 req->rq_disk->disk_name);
1372                         brq->retune_retry_done = 1;
1373                         return MMC_BLK_RETRY;
1374                 }
1375                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1376                        req->rq_disk->disk_name, brq->data.error,
1377                        (unsigned)blk_rq_pos(req),
1378                        (unsigned)blk_rq_sectors(req),
1379                        brq->cmd.resp[0], brq->stop.resp[0]);
1380
1381                 if (rq_data_dir(req) == READ) {
1382                         if (ecc_err)
1383                                 return MMC_BLK_ECC_ERR;
1384                         return MMC_BLK_DATA_ERR;
1385                 } else {
1386                         return MMC_BLK_CMD_ERR;
1387                 }
1388         }
1389
1390         if (!brq->data.bytes_xfered)
1391                 return MMC_BLK_RETRY;
1392
1393         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1394                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1395                         return MMC_BLK_PARTIAL;
1396                 else
1397                         return MMC_BLK_SUCCESS;
1398         }
1399
1400         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1401                 return MMC_BLK_PARTIAL;
1402
1403         return MMC_BLK_SUCCESS;
1404 }
1405
1406 static int mmc_blk_packed_err_check(struct mmc_card *card,
1407                                     struct mmc_async_req *areq)
1408 {
1409         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1410                         mmc_active);
1411         struct request *req = mq_rq->req;
1412         struct mmc_packed *packed = mq_rq->packed;
1413         int err, check, status;
1414         u8 *ext_csd;
1415
1416         BUG_ON(!packed);
1417
1418         packed->retries--;
1419         check = mmc_blk_err_check(card, areq);
1420         err = get_card_status(card, &status, 0);
1421         if (err) {
1422                 pr_err("%s: error %d sending status command\n",
1423                        req->rq_disk->disk_name, err);
1424                 return MMC_BLK_ABORT;
1425         }
1426
1427         if (status & R1_EXCEPTION_EVENT) {
1428                 err = mmc_get_ext_csd(card, &ext_csd);
1429                 if (err) {
1430                         pr_err("%s: error %d sending ext_csd\n",
1431                                req->rq_disk->disk_name, err);
1432                         return MMC_BLK_ABORT;
1433                 }
1434
1435                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1436                      EXT_CSD_PACKED_FAILURE) &&
1437                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1438                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1439                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1440                             EXT_CSD_PACKED_INDEXED_ERROR) {
1441                                 packed->idx_failure =
1442                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1443                                 check = MMC_BLK_PARTIAL;
1444                         }
1445                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1446                                "failure index: %d\n",
1447                                req->rq_disk->disk_name, packed->nr_entries,
1448                                packed->blocks, packed->idx_failure);
1449                 }
1450                 kfree(ext_csd);
1451         }
1452
1453         return check;
1454 }
1455
1456 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1457                                struct mmc_card *card,
1458                                int disable_multi,
1459                                struct mmc_queue *mq)
1460 {
1461         u32 readcmd, writecmd;
1462         struct mmc_blk_request *brq = &mqrq->brq;
1463         struct request *req = mqrq->req;
1464         struct mmc_blk_data *md = mq->data;
1465         bool do_data_tag;
1466
1467         /*
1468          * Reliable writes are used to implement Forced Unit Access and
1469          * are supported only on MMCs.
1470          */
1471         bool do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1472                 (rq_data_dir(req) == WRITE) &&
1473                 (md->flags & MMC_BLK_REL_WR);
1474
1475         memset(brq, 0, sizeof(struct mmc_blk_request));
1476         brq->mrq.cmd = &brq->cmd;
1477         brq->mrq.data = &brq->data;
1478
1479         brq->cmd.arg = blk_rq_pos(req);
1480         if (!mmc_card_blockaddr(card))
1481                 brq->cmd.arg <<= 9;
1482         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1483         brq->data.blksz = 512;
1484         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1485         brq->stop.arg = 0;
1486         brq->data.blocks = blk_rq_sectors(req);
1487
1488         /*
1489          * The block layer doesn't support all sector count
1490          * restrictions, so we need to be prepared for too big
1491          * requests.
1492          */
1493         if (brq->data.blocks > card->host->max_blk_count)
1494                 brq->data.blocks = card->host->max_blk_count;
1495
1496         if (brq->data.blocks > 1) {
1497                 /*
1498                  * After a read error, we redo the request one sector
1499                  * at a time in order to accurately determine which
1500                  * sectors can be read successfully.
1501                  */
1502                 if (disable_multi)
1503                         brq->data.blocks = 1;
1504
1505                 /*
1506                  * Some controllers have HW issues while operating
1507                  * in multiple I/O mode
1508                  */
1509                 if (card->host->ops->multi_io_quirk)
1510                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1511                                                 (rq_data_dir(req) == READ) ?
1512                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1513                                                 brq->data.blocks);
1514         }
1515
1516         if (brq->data.blocks > 1 || do_rel_wr) {
1517                 /* SPI multiblock writes terminate using a special
1518                  * token, not a STOP_TRANSMISSION request.
1519                  */
1520                 if (!mmc_host_is_spi(card->host) ||
1521                     rq_data_dir(req) == READ)
1522                         brq->mrq.stop = &brq->stop;
1523                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1524                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1525         } else {
1526                 brq->mrq.stop = NULL;
1527                 readcmd = MMC_READ_SINGLE_BLOCK;
1528                 writecmd = MMC_WRITE_BLOCK;
1529         }
1530         if (rq_data_dir(req) == READ) {
1531                 brq->cmd.opcode = readcmd;
1532                 brq->data.flags |= MMC_DATA_READ;
1533                 if (brq->mrq.stop)
1534                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1535                                         MMC_CMD_AC;
1536         } else {
1537                 brq->cmd.opcode = writecmd;
1538                 brq->data.flags |= MMC_DATA_WRITE;
1539                 if (brq->mrq.stop)
1540                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1541                                         MMC_CMD_AC;
1542         }
1543
1544         if (do_rel_wr)
1545                 mmc_apply_rel_rw(brq, card, req);
1546
1547         /*
1548          * Data tag is used only during writing meta data to speed
1549          * up write and any subsequent read of this meta data
1550          */
1551         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1552                 (req->cmd_flags & REQ_META) &&
1553                 (rq_data_dir(req) == WRITE) &&
1554                 ((brq->data.blocks * brq->data.blksz) >=
1555                  card->ext_csd.data_tag_unit_size);
1556
1557         /*
1558          * Pre-defined multi-block transfers are preferable to
1559          * open ended-ones (and necessary for reliable writes).
1560          * However, it is not sufficient to just send CMD23,
1561          * and avoid the final CMD12, as on an error condition
1562          * CMD12 (stop) needs to be sent anyway. This, coupled
1563          * with Auto-CMD23 enhancements provided by some
1564          * hosts, means that the complexity of dealing
1565          * with this is best left to the host. If CMD23 is
1566          * supported by card and host, we'll fill sbc in and let
1567          * the host deal with handling it correctly. This means
1568          * that for hosts that don't expose MMC_CAP_CMD23, no
1569          * change of behavior will be observed.
1570          *
1571          * N.B: Some MMC cards experience perf degradation.
1572          * We'll avoid using CMD23-bounded multiblock writes for
1573          * these, while retaining features like reliable writes.
1574          */
1575         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1576             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1577              do_data_tag)) {
1578                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1579                 brq->sbc.arg = brq->data.blocks |
1580                         (do_rel_wr ? (1 << 31) : 0) |
1581                         (do_data_tag ? (1 << 29) : 0);
1582                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1583                 brq->mrq.sbc = &brq->sbc;
1584         }
1585
1586         mmc_set_data_timeout(&brq->data, card);
1587
1588         brq->data.sg = mqrq->sg;
1589         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1590
1591         /*
1592          * Adjust the sg list so it is the same size as the
1593          * request.
1594          */
1595         if (brq->data.blocks != blk_rq_sectors(req)) {
1596                 int i, data_size = brq->data.blocks << 9;
1597                 struct scatterlist *sg;
1598
1599                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1600                         data_size -= sg->length;
1601                         if (data_size <= 0) {
1602                                 sg->length += data_size;
1603                                 i++;
1604                                 break;
1605                         }
1606                 }
1607                 brq->data.sg_len = i;
1608         }
1609
1610         mqrq->mmc_active.mrq = &brq->mrq;
1611         mqrq->mmc_active.err_check = mmc_blk_err_check;
1612
1613         mmc_queue_bounce_pre(mqrq);
1614 }
1615
1616 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1617                                           struct mmc_card *card)
1618 {
1619         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1620         unsigned int max_seg_sz = queue_max_segment_size(q);
1621         unsigned int len, nr_segs = 0;
1622
1623         do {
1624                 len = min(hdr_sz, max_seg_sz);
1625                 hdr_sz -= len;
1626                 nr_segs++;
1627         } while (hdr_sz);
1628
1629         return nr_segs;
1630 }
1631
1632 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1633 {
1634         struct request_queue *q = mq->queue;
1635         struct mmc_card *card = mq->card;
1636         struct request *cur = req, *next = NULL;
1637         struct mmc_blk_data *md = mq->data;
1638         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1639         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1640         unsigned int req_sectors = 0, phys_segments = 0;
1641         unsigned int max_blk_count, max_phys_segs;
1642         bool put_back = true;
1643         u8 max_packed_rw = 0;
1644         u8 reqs = 0;
1645
1646         if (!(md->flags & MMC_BLK_PACKED_CMD))
1647                 goto no_packed;
1648
1649         if ((rq_data_dir(cur) == WRITE) &&
1650             mmc_host_packed_wr(card->host))
1651                 max_packed_rw = card->ext_csd.max_packed_writes;
1652
1653         if (max_packed_rw == 0)
1654                 goto no_packed;
1655
1656         if (mmc_req_rel_wr(cur) &&
1657             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1658                 goto no_packed;
1659
1660         if (mmc_large_sector(card) &&
1661             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1662                 goto no_packed;
1663
1664         mmc_blk_clear_packed(mqrq);
1665
1666         max_blk_count = min(card->host->max_blk_count,
1667                             card->host->max_req_size >> 9);
1668         if (unlikely(max_blk_count > 0xffff))
1669                 max_blk_count = 0xffff;
1670
1671         max_phys_segs = queue_max_segments(q);
1672         req_sectors += blk_rq_sectors(cur);
1673         phys_segments += cur->nr_phys_segments;
1674
1675         if (rq_data_dir(cur) == WRITE) {
1676                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1677                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1678         }
1679
1680         do {
1681                 if (reqs >= max_packed_rw - 1) {
1682                         put_back = false;
1683                         break;
1684                 }
1685
1686                 spin_lock_irq(q->queue_lock);
1687                 next = blk_fetch_request(q);
1688                 spin_unlock_irq(q->queue_lock);
1689                 if (!next) {
1690                         put_back = false;
1691                         break;
1692                 }
1693
1694                 if (mmc_large_sector(card) &&
1695                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1696                         break;
1697
1698                 if (next->cmd_flags & REQ_DISCARD ||
1699                     next->cmd_flags & REQ_FLUSH)
1700                         break;
1701
1702                 if (rq_data_dir(cur) != rq_data_dir(next))
1703                         break;
1704
1705                 if (mmc_req_rel_wr(next) &&
1706                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1707                         break;
1708
1709                 req_sectors += blk_rq_sectors(next);
1710                 if (req_sectors > max_blk_count)
1711                         break;
1712
1713                 phys_segments +=  next->nr_phys_segments;
1714                 if (phys_segments > max_phys_segs)
1715                         break;
1716
1717                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1718                 cur = next;
1719                 reqs++;
1720         } while (1);
1721
1722         if (put_back) {
1723                 spin_lock_irq(q->queue_lock);
1724                 blk_requeue_request(q, next);
1725                 spin_unlock_irq(q->queue_lock);
1726         }
1727
1728         if (reqs > 0) {
1729                 list_add(&req->queuelist, &mqrq->packed->list);
1730                 mqrq->packed->nr_entries = ++reqs;
1731                 mqrq->packed->retries = reqs;
1732                 return reqs;
1733         }
1734
1735 no_packed:
1736         mqrq->cmd_type = MMC_PACKED_NONE;
1737         return 0;
1738 }
1739
1740 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1741                                         struct mmc_card *card,
1742                                         struct mmc_queue *mq)
1743 {
1744         struct mmc_blk_request *brq = &mqrq->brq;
1745         struct request *req = mqrq->req;
1746         struct request *prq;
1747         struct mmc_blk_data *md = mq->data;
1748         struct mmc_packed *packed = mqrq->packed;
1749         bool do_rel_wr, do_data_tag;
1750         u32 *packed_cmd_hdr;
1751         u8 hdr_blocks;
1752         u8 i = 1;
1753
1754         BUG_ON(!packed);
1755
1756         mqrq->cmd_type = MMC_PACKED_WRITE;
1757         packed->blocks = 0;
1758         packed->idx_failure = MMC_PACKED_NR_IDX;
1759
1760         packed_cmd_hdr = packed->cmd_hdr;
1761         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1762         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1763                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1764         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1765
1766         /*
1767          * Argument for each entry of packed group
1768          */
1769         list_for_each_entry(prq, &packed->list, queuelist) {
1770                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1771                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1772                         (prq->cmd_flags & REQ_META) &&
1773                         (rq_data_dir(prq) == WRITE) &&
1774                         ((brq->data.blocks * brq->data.blksz) >=
1775                          card->ext_csd.data_tag_unit_size);
1776                 /* Argument of CMD23 */
1777                 packed_cmd_hdr[(i * 2)] =
1778                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1779                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1780                         blk_rq_sectors(prq);
1781                 /* Argument of CMD18 or CMD25 */
1782                 packed_cmd_hdr[((i * 2)) + 1] =
1783                         mmc_card_blockaddr(card) ?
1784                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1785                 packed->blocks += blk_rq_sectors(prq);
1786                 i++;
1787         }
1788
1789         memset(brq, 0, sizeof(struct mmc_blk_request));
1790         brq->mrq.cmd = &brq->cmd;
1791         brq->mrq.data = &brq->data;
1792         brq->mrq.sbc = &brq->sbc;
1793         brq->mrq.stop = &brq->stop;
1794
1795         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1796         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1797         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1798
1799         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1800         brq->cmd.arg = blk_rq_pos(req);
1801         if (!mmc_card_blockaddr(card))
1802                 brq->cmd.arg <<= 9;
1803         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1804
1805         brq->data.blksz = 512;
1806         brq->data.blocks = packed->blocks + hdr_blocks;
1807         brq->data.flags |= MMC_DATA_WRITE;
1808
1809         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1810         brq->stop.arg = 0;
1811         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1812
1813         mmc_set_data_timeout(&brq->data, card);
1814
1815         brq->data.sg = mqrq->sg;
1816         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1817
1818         mqrq->mmc_active.mrq = &brq->mrq;
1819         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1820
1821         mmc_queue_bounce_pre(mqrq);
1822 }
1823
1824 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1825                            struct mmc_blk_request *brq, struct request *req,
1826                            int ret)
1827 {
1828         struct mmc_queue_req *mq_rq;
1829         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1830
1831         /*
1832          * If this is an SD card and we're writing, we can first
1833          * mark the known good sectors as ok.
1834          *
1835          * If the card is not SD, we can still ok written sectors
1836          * as reported by the controller (which might be less than
1837          * the real number of written sectors, but never more).
1838          */
1839         if (mmc_card_sd(card)) {
1840                 u32 blocks;
1841
1842                 blocks = mmc_sd_num_wr_blocks(card);
1843                 if (blocks != (u32)-1) {
1844                         ret = blk_end_request(req, 0, blocks << 9);
1845                 }
1846         } else {
1847                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1848                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1849         }
1850         return ret;
1851 }
1852
1853 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1854 {
1855         struct request *prq;
1856         struct mmc_packed *packed = mq_rq->packed;
1857         int idx = packed->idx_failure, i = 0;
1858         int ret = 0;
1859
1860         BUG_ON(!packed);
1861
1862         while (!list_empty(&packed->list)) {
1863                 prq = list_entry_rq(packed->list.next);
1864                 if (idx == i) {
1865                         /* retry from error index */
1866                         packed->nr_entries -= idx;
1867                         mq_rq->req = prq;
1868                         ret = 1;
1869
1870                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1871                                 list_del_init(&prq->queuelist);
1872                                 mmc_blk_clear_packed(mq_rq);
1873                         }
1874                         return ret;
1875                 }
1876                 list_del_init(&prq->queuelist);
1877                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1878                 i++;
1879         }
1880
1881         mmc_blk_clear_packed(mq_rq);
1882         return ret;
1883 }
1884
1885 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1886 {
1887         struct request *prq;
1888         struct mmc_packed *packed = mq_rq->packed;
1889
1890         BUG_ON(!packed);
1891
1892         while (!list_empty(&packed->list)) {
1893                 prq = list_entry_rq(packed->list.next);
1894                 list_del_init(&prq->queuelist);
1895                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1896         }
1897
1898         mmc_blk_clear_packed(mq_rq);
1899 }
1900
1901 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1902                                       struct mmc_queue_req *mq_rq)
1903 {
1904         struct request *prq;
1905         struct request_queue *q = mq->queue;
1906         struct mmc_packed *packed = mq_rq->packed;
1907
1908         BUG_ON(!packed);
1909
1910         while (!list_empty(&packed->list)) {
1911                 prq = list_entry_rq(packed->list.prev);
1912                 if (prq->queuelist.prev != &packed->list) {
1913                         list_del_init(&prq->queuelist);
1914                         spin_lock_irq(q->queue_lock);
1915                         blk_requeue_request(mq->queue, prq);
1916                         spin_unlock_irq(q->queue_lock);
1917                 } else {
1918                         list_del_init(&prq->queuelist);
1919                 }
1920         }
1921
1922         mmc_blk_clear_packed(mq_rq);
1923 }
1924
1925 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1926 {
1927         struct mmc_blk_data *md = mq->data;
1928         struct mmc_card *card = md->queue.card;
1929         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1930         int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1931         enum mmc_blk_status status;
1932         struct mmc_queue_req *mq_rq;
1933         struct request *req = rqc;
1934         struct mmc_async_req *areq;
1935         const u8 packed_nr = 2;
1936         u8 reqs = 0;
1937
1938         if (!rqc && !mq->mqrq_prev->req)
1939                 return 0;
1940
1941         if (rqc)
1942                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1943
1944         do {
1945                 if (rqc) {
1946                         /*
1947                          * When 4KB native sector is enabled, only 8 blocks
1948                          * multiple read or write is allowed
1949                          */
1950                         if ((brq->data.blocks & 0x07) &&
1951                             (card->ext_csd.data_sector_size == 4096)) {
1952                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1953                                         req->rq_disk->disk_name);
1954                                 mq_rq = mq->mqrq_cur;
1955                                 goto cmd_abort;
1956                         }
1957
1958                         if (reqs >= packed_nr)
1959                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1960                                                             card, mq);
1961                         else
1962                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1963                         areq = &mq->mqrq_cur->mmc_active;
1964                 } else
1965                         areq = NULL;
1966                 areq = mmc_start_req(card->host, areq, (int *) &status);
1967                 if (!areq) {
1968                         if (status == MMC_BLK_NEW_REQUEST)
1969                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1970                         return 0;
1971                 }
1972
1973                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1974                 brq = &mq_rq->brq;
1975                 req = mq_rq->req;
1976                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1977                 mmc_queue_bounce_post(mq_rq);
1978
1979                 switch (status) {
1980                 case MMC_BLK_SUCCESS:
1981                 case MMC_BLK_PARTIAL:
1982                         /*
1983                          * A block was successfully transferred.
1984                          */
1985                         mmc_blk_reset_success(md, type);
1986
1987                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1988                                 ret = mmc_blk_end_packed_req(mq_rq);
1989                                 break;
1990                         } else {
1991                                 ret = blk_end_request(req, 0,
1992                                                 brq->data.bytes_xfered);
1993                         }
1994
1995                         /*
1996                          * If the blk_end_request function returns non-zero even
1997                          * though all data has been transferred and no errors
1998                          * were returned by the host controller, it's a bug.
1999                          */
2000                         if (status == MMC_BLK_SUCCESS && ret) {
2001                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
2002                                        __func__, blk_rq_bytes(req),
2003                                        brq->data.bytes_xfered);
2004                                 rqc = NULL;
2005                                 goto cmd_abort;
2006                         }
2007                         break;
2008                 case MMC_BLK_CMD_ERR:
2009                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
2010                         if (mmc_blk_reset(md, card->host, type))
2011                                 goto cmd_abort;
2012                         if (!ret)
2013                                 goto start_new_req;
2014                         break;
2015                 case MMC_BLK_RETRY:
2016                         retune_retry_done = brq->retune_retry_done;
2017                         if (retry++ < 5)
2018                                 break;
2019                         /* Fall through */
2020                 case MMC_BLK_ABORT:
2021                         if (!mmc_blk_reset(md, card->host, type))
2022                                 break;
2023                         goto cmd_abort;
2024                 case MMC_BLK_DATA_ERR: {
2025                         int err;
2026
2027                         err = mmc_blk_reset(md, card->host, type);
2028                         if (!err)
2029                                 break;
2030                         if (err == -ENODEV ||
2031                                 mmc_packed_cmd(mq_rq->cmd_type))
2032                                 goto cmd_abort;
2033                         /* Fall through */
2034                 }
2035                 case MMC_BLK_ECC_ERR:
2036                         if (brq->data.blocks > 1) {
2037                                 /* Redo read one sector at a time */
2038                                 pr_warn("%s: retrying using single block read\n",
2039                                         req->rq_disk->disk_name);
2040                                 disable_multi = 1;
2041                                 break;
2042                         }
2043                         /*
2044                          * After an error, we redo I/O one sector at a
2045                          * time, so we only reach here after trying to
2046                          * read a single sector.
2047                          */
2048                         ret = blk_end_request(req, -EIO,
2049                                                 brq->data.blksz);
2050                         if (!ret)
2051                                 goto start_new_req;
2052                         break;
2053                 case MMC_BLK_NOMEDIUM:
2054                         goto cmd_abort;
2055                 default:
2056                         pr_err("%s: Unhandled return value (%d)",
2057                                         req->rq_disk->disk_name, status);
2058                         goto cmd_abort;
2059                 }
2060
2061                 if (ret) {
2062                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2063                                 if (!mq_rq->packed->retries)
2064                                         goto cmd_abort;
2065                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
2066                                 mmc_start_req(card->host,
2067                                               &mq_rq->mmc_active, NULL);
2068                         } else {
2069
2070                                 /*
2071                                  * In case of a incomplete request
2072                                  * prepare it again and resend.
2073                                  */
2074                                 mmc_blk_rw_rq_prep(mq_rq, card,
2075                                                 disable_multi, mq);
2076                                 mmc_start_req(card->host,
2077                                                 &mq_rq->mmc_active, NULL);
2078                         }
2079                         mq_rq->brq.retune_retry_done = retune_retry_done;
2080                 }
2081         } while (ret);
2082
2083         return 1;
2084
2085  cmd_abort:
2086         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2087                 mmc_blk_abort_packed_req(mq_rq);
2088         } else {
2089                 if (mmc_card_removed(card))
2090                         req->cmd_flags |= REQ_QUIET;
2091                 while (ret)
2092                         ret = blk_end_request(req, -EIO,
2093                                         blk_rq_cur_bytes(req));
2094         }
2095
2096  start_new_req:
2097         if (rqc) {
2098                 if (mmc_card_removed(card)) {
2099                         rqc->cmd_flags |= REQ_QUIET;
2100                         blk_end_request_all(rqc, -EIO);
2101                 } else {
2102                         /*
2103                          * If current request is packed, it needs to put back.
2104                          */
2105                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2106                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2107
2108                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2109                         mmc_start_req(card->host,
2110                                       &mq->mqrq_cur->mmc_active, NULL);
2111                 }
2112         }
2113
2114         return 0;
2115 }
2116
2117 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2118 {
2119         int ret;
2120         struct mmc_blk_data *md = mq->data;
2121         struct mmc_card *card = md->queue.card;
2122         struct mmc_host *host = card->host;
2123         unsigned long flags;
2124         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2125
2126         if (req && !mq->mqrq_prev->req)
2127                 /* claim host only for the first request */
2128                 mmc_get_card(card);
2129
2130         ret = mmc_blk_part_switch(card, md);
2131         if (ret) {
2132                 if (req) {
2133                         blk_end_request_all(req, -EIO);
2134                 }
2135                 ret = 0;
2136                 goto out;
2137         }
2138
2139         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2140         if (cmd_flags & REQ_DISCARD) {
2141                 /* complete ongoing async transfer before issuing discard */
2142                 if (card->host->areq)
2143                         mmc_blk_issue_rw_rq(mq, NULL);
2144                 if (req->cmd_flags & REQ_SECURE)
2145                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2146                 else
2147                         ret = mmc_blk_issue_discard_rq(mq, req);
2148         } else if (cmd_flags & REQ_FLUSH) {
2149                 /* complete ongoing async transfer before issuing flush */
2150                 if (card->host->areq)
2151                         mmc_blk_issue_rw_rq(mq, NULL);
2152                 ret = mmc_blk_issue_flush(mq, req);
2153         } else {
2154                 if (!req && host->areq) {
2155                         spin_lock_irqsave(&host->context_info.lock, flags);
2156                         host->context_info.is_waiting_last_req = true;
2157                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2158                 }
2159                 ret = mmc_blk_issue_rw_rq(mq, req);
2160         }
2161
2162 out:
2163         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2164              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2165                 /*
2166                  * Release host when there are no more requests
2167                  * and after special request(discard, flush) is done.
2168                  * In case sepecial request, there is no reentry to
2169                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2170                  */
2171                 mmc_put_card(card);
2172         return ret;
2173 }
2174
2175 static inline int mmc_blk_readonly(struct mmc_card *card)
2176 {
2177         return mmc_card_readonly(card) ||
2178                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2179 }
2180
2181 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2182                                               struct device *parent,
2183                                               sector_t size,
2184                                               bool default_ro,
2185                                               const char *subname,
2186                                               int area_type)
2187 {
2188         struct mmc_blk_data *md;
2189         int devidx, ret;
2190
2191         devidx = find_first_zero_bit(dev_use, max_devices);
2192         if (devidx >= max_devices)
2193                 return ERR_PTR(-ENOSPC);
2194         __set_bit(devidx, dev_use);
2195
2196         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2197         if (!md) {
2198                 ret = -ENOMEM;
2199                 goto out;
2200         }
2201
2202         /*
2203          * !subname implies we are creating main mmc_blk_data that will be
2204          * associated with mmc_card with dev_set_drvdata. Due to device
2205          * partitions, devidx will not coincide with a per-physical card
2206          * index anymore so we keep track of a name index.
2207          */
2208         if (!subname) {
2209                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2210                 __set_bit(md->name_idx, name_use);
2211         } else
2212                 md->name_idx = ((struct mmc_blk_data *)
2213                                 dev_to_disk(parent)->private_data)->name_idx;
2214
2215         md->area_type = area_type;
2216
2217         /*
2218          * Set the read-only status based on the supported commands
2219          * and the write protect switch.
2220          */
2221         md->read_only = mmc_blk_readonly(card);
2222
2223         md->disk = alloc_disk(perdev_minors);
2224         if (md->disk == NULL) {
2225                 ret = -ENOMEM;
2226                 goto err_kfree;
2227         }
2228
2229         spin_lock_init(&md->lock);
2230         INIT_LIST_HEAD(&md->part);
2231         md->usage = 1;
2232
2233         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2234         if (ret)
2235                 goto err_putdisk;
2236
2237         md->queue.issue_fn = mmc_blk_issue_rq;
2238         md->queue.data = md;
2239
2240         md->disk->major = MMC_BLOCK_MAJOR;
2241         md->disk->first_minor = devidx * perdev_minors;
2242         md->disk->fops = &mmc_bdops;
2243         md->disk->private_data = md;
2244         md->disk->queue = md->queue.queue;
2245         md->disk->driverfs_dev = parent;
2246         set_disk_ro(md->disk, md->read_only || default_ro);
2247         md->disk->flags = GENHD_FL_EXT_DEVT;
2248         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2249                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2250
2251         /*
2252          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2253          *
2254          * - be set for removable media with permanent block devices
2255          * - be unset for removable block devices with permanent media
2256          *
2257          * Since MMC block devices clearly fall under the second
2258          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2259          * should use the block device creation/destruction hotplug
2260          * messages to tell when the card is present.
2261          */
2262
2263         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2264                  "mmcblk%u%s", md->name_idx, subname ? subname : "");
2265
2266         if (mmc_card_mmc(card))
2267                 blk_queue_logical_block_size(md->queue.queue,
2268                                              card->ext_csd.data_sector_size);
2269         else
2270                 blk_queue_logical_block_size(md->queue.queue, 512);
2271
2272         set_capacity(md->disk, size);
2273
2274         if (mmc_host_cmd23(card->host)) {
2275                 if (mmc_card_mmc(card) ||
2276                     (mmc_card_sd(card) &&
2277                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2278                         md->flags |= MMC_BLK_CMD23;
2279         }
2280
2281         if (mmc_card_mmc(card) &&
2282             md->flags & MMC_BLK_CMD23 &&
2283             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2284              card->ext_csd.rel_sectors)) {
2285                 md->flags |= MMC_BLK_REL_WR;
2286                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2287         }
2288
2289         if (mmc_card_mmc(card) &&
2290             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2291             (md->flags & MMC_BLK_CMD23) &&
2292             card->ext_csd.packed_event_en) {
2293                 if (!mmc_packed_init(&md->queue, card))
2294                         md->flags |= MMC_BLK_PACKED_CMD;
2295         }
2296
2297         return md;
2298
2299  err_putdisk:
2300         put_disk(md->disk);
2301  err_kfree:
2302         kfree(md);
2303  out:
2304         return ERR_PTR(ret);
2305 }
2306
2307 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2308 {
2309         sector_t size;
2310
2311         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2312                 /*
2313                  * The EXT_CSD sector count is in number or 512 byte
2314                  * sectors.
2315                  */
2316                 size = card->ext_csd.sectors;
2317         } else {
2318                 /*
2319                  * The CSD capacity field is in units of read_blkbits.
2320                  * set_capacity takes units of 512 bytes.
2321                  */
2322                 size = (typeof(sector_t))card->csd.capacity
2323                         << (card->csd.read_blkbits - 9);
2324         }
2325
2326         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2327                                         MMC_BLK_DATA_AREA_MAIN);
2328 }
2329
2330 static int mmc_blk_alloc_part(struct mmc_card *card,
2331                               struct mmc_blk_data *md,
2332                               unsigned int part_type,
2333                               sector_t size,
2334                               bool default_ro,
2335                               const char *subname,
2336                               int area_type)
2337 {
2338         char cap_str[10];
2339         struct mmc_blk_data *part_md;
2340
2341         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2342                                     subname, area_type);
2343         if (IS_ERR(part_md))
2344                 return PTR_ERR(part_md);
2345         part_md->part_type = part_type;
2346         list_add(&part_md->part, &md->part);
2347
2348         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2349                         cap_str, sizeof(cap_str));
2350         pr_info("%s: %s %s partition %u %s\n",
2351                part_md->disk->disk_name, mmc_card_id(card),
2352                mmc_card_name(card), part_md->part_type, cap_str);
2353         return 0;
2354 }
2355
2356 /* MMC Physical partitions consist of two boot partitions and
2357  * up to four general purpose partitions.
2358  * For each partition enabled in EXT_CSD a block device will be allocatedi
2359  * to provide access to the partition.
2360  */
2361
2362 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2363 {
2364         int idx, ret = 0;
2365
2366         if (!mmc_card_mmc(card))
2367                 return 0;
2368
2369         for (idx = 0; idx < card->nr_parts; idx++) {
2370                 if (card->part[idx].size) {
2371                         ret = mmc_blk_alloc_part(card, md,
2372                                 card->part[idx].part_cfg,
2373                                 card->part[idx].size >> 9,
2374                                 card->part[idx].force_ro,
2375                                 card->part[idx].name,
2376                                 card->part[idx].area_type);
2377                         if (ret)
2378                                 return ret;
2379                 }
2380         }
2381
2382         return ret;
2383 }
2384
2385 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2386 {
2387         struct mmc_card *card;
2388
2389         if (md) {
2390                 /*
2391                  * Flush remaining requests and free queues. It
2392                  * is freeing the queue that stops new requests
2393                  * from being accepted.
2394                  */
2395                 card = md->queue.card;
2396                 mmc_cleanup_queue(&md->queue);
2397                 if (md->flags & MMC_BLK_PACKED_CMD)
2398                         mmc_packed_clean(&md->queue);
2399                 if (md->disk->flags & GENHD_FL_UP) {
2400                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2401                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2402                                         card->ext_csd.boot_ro_lockable)
2403                                 device_remove_file(disk_to_dev(md->disk),
2404                                         &md->power_ro_lock);
2405
2406                         del_gendisk(md->disk);
2407                 }
2408                 mmc_blk_put(md);
2409         }
2410 }
2411
2412 static void mmc_blk_remove_parts(struct mmc_card *card,
2413                                  struct mmc_blk_data *md)
2414 {
2415         struct list_head *pos, *q;
2416         struct mmc_blk_data *part_md;
2417
2418         __clear_bit(md->name_idx, name_use);
2419         list_for_each_safe(pos, q, &md->part) {
2420                 part_md = list_entry(pos, struct mmc_blk_data, part);
2421                 list_del(pos);
2422                 mmc_blk_remove_req(part_md);
2423         }
2424 }
2425
2426 static int mmc_add_disk(struct mmc_blk_data *md)
2427 {
2428         int ret;
2429         struct mmc_card *card = md->queue.card;
2430
2431         add_disk(md->disk);
2432         md->force_ro.show = force_ro_show;
2433         md->force_ro.store = force_ro_store;
2434         sysfs_attr_init(&md->force_ro.attr);
2435         md->force_ro.attr.name = "force_ro";
2436         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2437         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2438         if (ret)
2439                 goto force_ro_fail;
2440
2441         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2442              card->ext_csd.boot_ro_lockable) {
2443                 umode_t mode;
2444
2445                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2446                         mode = S_IRUGO;
2447                 else
2448                         mode = S_IRUGO | S_IWUSR;
2449
2450                 md->power_ro_lock.show = power_ro_lock_show;
2451                 md->power_ro_lock.store = power_ro_lock_store;
2452                 sysfs_attr_init(&md->power_ro_lock.attr);
2453                 md->power_ro_lock.attr.mode = mode;
2454                 md->power_ro_lock.attr.name =
2455                                         "ro_lock_until_next_power_on";
2456                 ret = device_create_file(disk_to_dev(md->disk),
2457                                 &md->power_ro_lock);
2458                 if (ret)
2459                         goto power_ro_lock_fail;
2460         }
2461         return ret;
2462
2463 power_ro_lock_fail:
2464         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2465 force_ro_fail:
2466         del_gendisk(md->disk);
2467
2468         return ret;
2469 }
2470
2471 #define CID_MANFID_SANDISK      0x2
2472 #define CID_MANFID_TOSHIBA      0x11
2473 #define CID_MANFID_MICRON       0x13
2474 #define CID_MANFID_SAMSUNG      0x15
2475 #define CID_MANFID_KINGSTON     0x70
2476
2477 static const struct mmc_fixup blk_fixups[] =
2478 {
2479         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2480                   MMC_QUIRK_INAND_CMD38),
2481         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2482                   MMC_QUIRK_INAND_CMD38),
2483         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2484                   MMC_QUIRK_INAND_CMD38),
2485         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2486                   MMC_QUIRK_INAND_CMD38),
2487         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2488                   MMC_QUIRK_INAND_CMD38),
2489
2490         /*
2491          * Some MMC cards experience performance degradation with CMD23
2492          * instead of CMD12-bounded multiblock transfers. For now we'll
2493          * black list what's bad...
2494          * - Certain Toshiba cards.
2495          *
2496          * N.B. This doesn't affect SD cards.
2497          */
2498         MMC_FIXUP("SDMB-32", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2499                   MMC_QUIRK_BLK_NO_CMD23),
2500         MMC_FIXUP("SDM032", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2501                   MMC_QUIRK_BLK_NO_CMD23),
2502         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2503                   MMC_QUIRK_BLK_NO_CMD23),
2504         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2505                   MMC_QUIRK_BLK_NO_CMD23),
2506         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2507                   MMC_QUIRK_BLK_NO_CMD23),
2508
2509         /*
2510          * Some Micron MMC cards needs longer data read timeout than
2511          * indicated in CSD.
2512          */
2513         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2514                   MMC_QUIRK_LONG_READ_TIME),
2515
2516         /*
2517          * On these Samsung MoviNAND parts, performing secure erase or
2518          * secure trim can result in unrecoverable corruption due to a
2519          * firmware bug.
2520          */
2521         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2522                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2523         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2524                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2525         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2526                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2527         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2528                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2529         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2530                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2531         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2532                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2533         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2534                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2535         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2536                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2537
2538         /*
2539          *  On Some Kingston eMMCs, performing trim can result in
2540          *  unrecoverable data conrruption occasionally due to a firmware bug.
2541          */
2542         MMC_FIXUP("V10008", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2543                   MMC_QUIRK_TRIM_BROKEN),
2544         MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2545                   MMC_QUIRK_TRIM_BROKEN),
2546
2547         END_FIXUP
2548 };
2549
2550 static int mmc_blk_probe(struct mmc_card *card)
2551 {
2552         struct mmc_blk_data *md, *part_md;
2553         char cap_str[10];
2554
2555         /*
2556          * Check that the card supports the command class(es) we need.
2557          */
2558         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2559                 return -ENODEV;
2560
2561         mmc_fixup_device(card, blk_fixups);
2562
2563         md = mmc_blk_alloc(card);
2564         if (IS_ERR(md))
2565                 return PTR_ERR(md);
2566
2567         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2568                         cap_str, sizeof(cap_str));
2569         pr_info("%s: %s %s %s %s\n",
2570                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2571                 cap_str, md->read_only ? "(ro)" : "");
2572
2573         if (mmc_blk_alloc_parts(card, md))
2574                 goto out;
2575
2576         dev_set_drvdata(&card->dev, md);
2577
2578         if (mmc_add_disk(md))
2579                 goto out;
2580
2581         list_for_each_entry(part_md, &md->part, part) {
2582                 if (mmc_add_disk(part_md))
2583                         goto out;
2584         }
2585
2586         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2587         pm_runtime_use_autosuspend(&card->dev);
2588
2589         /*
2590          * Don't enable runtime PM for SD-combo cards here. Leave that
2591          * decision to be taken during the SDIO init sequence instead.
2592          */
2593         if (card->type != MMC_TYPE_SD_COMBO) {
2594                 pm_runtime_set_active(&card->dev);
2595                 pm_runtime_enable(&card->dev);
2596         }
2597
2598         return 0;
2599
2600  out:
2601         mmc_blk_remove_parts(card, md);
2602         mmc_blk_remove_req(md);
2603         return 0;
2604 }
2605
2606 static void mmc_blk_remove(struct mmc_card *card)
2607 {
2608         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2609
2610         mmc_blk_remove_parts(card, md);
2611         pm_runtime_get_sync(&card->dev);
2612         mmc_claim_host(card->host);
2613         mmc_blk_part_switch(card, md);
2614         mmc_release_host(card->host);
2615         if (card->type != MMC_TYPE_SD_COMBO)
2616                 pm_runtime_disable(&card->dev);
2617         pm_runtime_put_noidle(&card->dev);
2618         mmc_blk_remove_req(md);
2619         dev_set_drvdata(&card->dev, NULL);
2620 }
2621
2622 static int _mmc_blk_suspend(struct mmc_card *card)
2623 {
2624         struct mmc_blk_data *part_md;
2625         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2626
2627         if (md) {
2628                 mmc_queue_suspend(&md->queue);
2629                 list_for_each_entry(part_md, &md->part, part) {
2630                         mmc_queue_suspend(&part_md->queue);
2631                 }
2632         }
2633         return 0;
2634 }
2635
2636 static void mmc_blk_shutdown(struct mmc_card *card)
2637 {
2638         _mmc_blk_suspend(card);
2639 }
2640
2641 #ifdef CONFIG_PM_SLEEP
2642 static int mmc_blk_suspend(struct device *dev)
2643 {
2644         struct mmc_card *card = mmc_dev_to_card(dev);
2645
2646         return _mmc_blk_suspend(card);
2647 }
2648
2649 static int mmc_blk_resume(struct device *dev)
2650 {
2651         struct mmc_blk_data *part_md;
2652         struct mmc_blk_data *md = dev_get_drvdata(dev);
2653
2654         if (md) {
2655                 /*
2656                  * Resume involves the card going into idle state,
2657                  * so current partition is always the main one.
2658                  */
2659                 md->part_curr = md->part_type;
2660                 mmc_queue_resume(&md->queue);
2661                 list_for_each_entry(part_md, &md->part, part) {
2662                         mmc_queue_resume(&part_md->queue);
2663                 }
2664         }
2665         return 0;
2666 }
2667 #endif
2668
2669 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2670
2671 static struct mmc_driver mmc_driver = {
2672         .drv            = {
2673                 .name   = "mmcblk",
2674                 .pm     = &mmc_blk_pm_ops,
2675         },
2676         .probe          = mmc_blk_probe,
2677         .remove         = mmc_blk_remove,
2678         .shutdown       = mmc_blk_shutdown,
2679 };
2680
2681 static int __init mmc_blk_init(void)
2682 {
2683         int res;
2684
2685         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2686                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2687
2688         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2689
2690         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2691         if (res)
2692                 goto out;
2693
2694         res = mmc_register_driver(&mmc_driver);
2695         if (res)
2696                 goto out2;
2697
2698         return 0;
2699  out2:
2700         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2701  out:
2702         return res;
2703 }
2704
2705 static void __exit mmc_blk_exit(void)
2706 {
2707         mmc_unregister_driver(&mmc_driver);
2708         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2709 }
2710
2711 module_init(mmc_blk_init);
2712 module_exit(mmc_blk_exit);
2713
2714 MODULE_LICENSE("GPL");
2715 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2716