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
  38 #include <linux/mmc/ioctl.h>
  39 #include <linux/mmc/card.h>
  40 #include <linux/mmc/host.h>
  41 #include <linux/mmc/mmc.h>
  42 #include <linux/mmc/sd.h>
  43
  44 #include <asm/uaccess.h>
  45
  46 #include "queue.h"
  47
  48 MODULE_ALIAS("mmc:block");
  49 #ifdef MODULE_PARAM_PREFIX
  50 #undef MODULE_PARAM_PREFIX
  51 #endif
  52 #define MODULE_PARAM_PREFIX "mmcblk."
  53
  54 #define INAND_CMD38_ARG_EXT_CSD  113
  55 #define INAND_CMD38_ARG_ERASE    0x00
  56 #define INAND_CMD38_ARG_TRIM     0x01
  57 #define INAND_CMD38_ARG_SECERASE 0x80
  58 #define INAND_CMD38_ARG_SECTRIM1 0x81
  59 #define INAND_CMD38_ARG_SECTRIM2 0x88
  60 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  61
  62 #define mmc_req_rel_wr(req)     (((req->cmd_flags & REQ_FUA) || \
  63                                   (req->cmd_flags & REQ_META)) && \
  64                                   (rq_data_dir(req) == WRITE))
  65 #define PACKED_CMD_VER  0x01
  66 #define PACKED_CMD_WR   0x02
  67
  68 static DEFINE_MUTEX(block_mutex);
  69
  70 /*
  71  * The defaults come from config options but can be overriden by module
  72  * or bootarg options.
  73  */
  74 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  75
  76 /*
  77  * We've only got one major, so number of mmcblk devices is
  78  * limited to 256 / number of minors per device.
  79  */
  80 static int max_devices;
  81
  82 /* 256 minors, so at most 256 separate devices */
  83 static DECLARE_BITMAP(dev_use, 256);
  84 static DECLARE_BITMAP(name_use, 256);
  85
  86 /*
  87  * There is one mmc_blk_data per slot.
  88  */
  89 struct mmc_blk_data {
  90         spinlock_t      lock;
  91         struct gendisk  *disk;
  92         struct mmc_queue queue;
  93         struct list_head part;
  94
  95         unsigned int    flags;
  96 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
  97 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
  98 #define MMC_BLK_PACKED_CMD      (1 << 2)        /* MMC packed command support */
  99
 100         unsigned int    usage;
 101         unsigned int    read_only;
 102         unsigned int    part_type;
 103         unsigned int    name_idx;
 104         unsigned int    reset_done;
 105 #define MMC_BLK_READ            BIT(0)
 106 #define MMC_BLK_WRITE           BIT(1)
 107 #define MMC_BLK_DISCARD         BIT(2)
 108 #define MMC_BLK_SECDISCARD      BIT(3)
 109
 110         /*
 111          * Only set in main mmc_blk_data associated
 112          * with mmc_card with mmc_set_drvdata, and keeps
 113          * track of the current selected device partition.
 114          */
 115         unsigned int    part_curr;
 116         struct device_attribute force_ro;
 117         struct device_attribute power_ro_lock;
 118         int     area_type;
 119 };
 120
 121 static DEFINE_MUTEX(open_lock);
 122
 123 enum {
 124         MMC_PACKED_NR_IDX = -1,
 125         MMC_PACKED_NR_ZERO,
 126         MMC_PACKED_NR_SINGLE,
 127 };
 128
 129 module_param(perdev_minors, int, 0444);
 130 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 131
 132 static inline int mmc_blk_part_switch(struct mmc_card *card,
 133                                       struct mmc_blk_data *md);
 134 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 135
 136 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 137 {
 138         struct mmc_packed *packed = mqrq->packed;
 139
 140         BUG_ON(!packed);
 141
 142         mqrq->cmd_type = MMC_PACKED_NONE;
 143         packed->nr_entries = MMC_PACKED_NR_ZERO;
 144         packed->idx_failure = MMC_PACKED_NR_IDX;
 145         packed->retries = 0;
 146         packed->blocks = 0;
 147 }
 148
 149 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 150 {
 151         struct mmc_blk_data *md;
 152
 153         mutex_lock(&open_lock);
 154         md = disk->private_data;
 155         if (md && md->usage == 0)
 156                 md = NULL;
 157         if (md)
 158                 md->usage++;
 159         mutex_unlock(&open_lock);
 160
 161         return md;
 162 }
 163
 164 static inline int mmc_get_devidx(struct gendisk *disk)
 165 {
 166         int devmaj = MAJOR(disk_devt(disk));
 167         int devidx = MINOR(disk_devt(disk)) / perdev_minors;
 168
 169         if (!devmaj)
 170                 devidx = disk->first_minor / perdev_minors;
 171         return devidx;
 172 }
 173
 174 static void mmc_blk_put(struct mmc_blk_data *md)
 175 {
 176         mutex_lock(&open_lock);
 177         md->usage--;
 178         if (md->usage == 0) {
 179                 int devidx = mmc_get_devidx(md->disk);
 180                 blk_cleanup_queue(md->queue.queue);
 181
 182                 __clear_bit(devidx, dev_use);
 183
 184                 put_disk(md->disk);
 185                 kfree(md);
 186         }
 187         mutex_unlock(&open_lock);
 188 }
 189
 190 static ssize_t power_ro_lock_show(struct device *dev,
 191                 struct device_attribute *attr, char *buf)
 192 {
 193         int ret;
 194         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 195         struct mmc_card *card = md->queue.card;
 196         int locked = 0;
 197
 198         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 199                 locked = 2;
 200         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 201                 locked = 1;
 202
 203         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 204
 205         return ret;
 206 }
 207
 208 static ssize_t power_ro_lock_store(struct device *dev,
 209                 struct device_attribute *attr, const char *buf, size_t count)
 210 {
 211         int ret;
 212         struct mmc_blk_data *md, *part_md;
 213         struct mmc_card *card;
 214         unsigned long set;
 215
 216         if (kstrtoul(buf, 0, &set))
 217                 return -EINVAL;
 218
 219         if (set != 1)
 220                 return count;
 221
 222         md = mmc_blk_get(dev_to_disk(dev));
 223         card = md->queue.card;
 224
 225         mmc_claim_host(card->host);
 226
 227         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 228                                 card->ext_csd.boot_ro_lock |
 229                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 230                                 card->ext_csd.part_time);
 231         if (ret)
 232                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 233         else
 234                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 235
 236         mmc_release_host(card->host);
 237
 238         if (!ret) {
 239                 pr_info("%s: Locking boot partition ro until next power on\n",
 240                         md->disk->disk_name);
 241                 set_disk_ro(md->disk, 1);
 242
 243                 list_for_each_entry(part_md, &md->part, part)
 244                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 245                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 246                                 set_disk_ro(part_md->disk, 1);
 247                         }
 248         }
 249
 250         mmc_blk_put(md);
 251         return count;
 252 }
 253
 254 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 255                              char *buf)
 256 {
 257         int ret;
 258         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 259
 260         ret = snprintf(buf, PAGE_SIZE, "%d",
 261                        get_disk_ro(dev_to_disk(dev)) ^
 262                        md->read_only);
 263         mmc_blk_put(md);
 264         return ret;
 265 }
 266
 267 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 268                               const char *buf, size_t count)
 269 {
 270         int ret;
 271         char *end;
 272         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 273         unsigned long set = simple_strtoul(buf, &end, 0);
 274         if (end == buf) {
 275                 ret = -EINVAL;
 276                 goto out;
 277         }
 278
 279         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 280         ret = count;
 281 out:
 282         mmc_blk_put(md);
 283         return ret;
 284 }
 285
 286 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 287 {
 288         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 289         int ret = -ENXIO;
 290
 291         mutex_lock(&block_mutex);
 292         if (md) {
 293                 if (md->usage == 2)
 294                         check_disk_change(bdev);
 295                 ret = 0;
 296
 297                 if ((mode & FMODE_WRITE) && md->read_only) {
 298                         mmc_blk_put(md);
 299                         ret = -EROFS;
 300                 }
 301         }
 302         mutex_unlock(&block_mutex);
 303
 304         return ret;
 305 }
 306
 307 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 308 {
 309         struct mmc_blk_data *md = disk->private_data;
 310
 311         mutex_lock(&block_mutex);
 312         mmc_blk_put(md);
 313         mutex_unlock(&block_mutex);
 314 }
 315
 316 static int
 317 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 318 {
 319         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 320         geo->heads = 4;
 321         geo->sectors = 16;
 322         return 0;
 323 }
 324
 325 struct mmc_blk_ioc_data {
 326         struct mmc_ioc_cmd ic;
 327         unsigned char *buf;
 328         u64 buf_bytes;
 329 };
 330
 331 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 332         struct mmc_ioc_cmd __user *user)
 333 {
 334         struct mmc_blk_ioc_data *idata;
 335         int err;
 336
 337         idata = kzalloc(sizeof(*idata), GFP_KERNEL);
 338         if (!idata) {
 339                 err = -ENOMEM;
 340                 goto out;
 341         }
 342
 343         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 344                 err = -EFAULT;
 345                 goto idata_err;
 346         }
 347
 348         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 349         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 350                 err = -EOVERFLOW;
 351                 goto idata_err;
 352         }
 353
 354         if (!idata->buf_bytes)
 355                 return idata;
 356
 357         idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
 358         if (!idata->buf) {
 359                 err = -ENOMEM;
 360                 goto idata_err;
 361         }
 362
 363         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 364                                         idata->ic.data_ptr, idata->buf_bytes)) {
 365                 err = -EFAULT;
 366                 goto copy_err;
 367         }
 368
 369         return idata;
 370
 371 copy_err:
 372         kfree(idata->buf);
 373 idata_err:
 374         kfree(idata);
 375 out:
 376         return ERR_PTR(err);
 377 }
 378
 379 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 380                                        u32 retries_max)
 381 {
 382         int err;
 383         u32 retry_count = 0;
 384
 385         if (!status || !retries_max)
 386                 return -EINVAL;
 387
 388         do {
 389                 err = get_card_status(card, status, 5);
 390                 if (err)
 391                         break;
 392
 393                 if (!R1_STATUS(*status) &&
 394                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 395                         break; /* RPMB programming operation complete */
 396
 397                 /*
 398                  * Rechedule to give the MMC device a chance to continue
 399                  * processing the previous command without being polled too
 400                  * frequently.
 401                  */
 402                 usleep_range(1000, 5000);
 403         } while (++retry_count < retries_max);
 404
 405         if (retry_count == retries_max)
 406                 err = -EPERM;
 407
 408         return err;
 409 }
 410
 411 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 412         struct mmc_ioc_cmd __user *ic_ptr)
 413 {
 414         struct mmc_blk_ioc_data *idata;
 415         struct mmc_blk_data *md;
 416         struct mmc_card *card;
 417         struct mmc_command cmd = {0};
 418         struct mmc_data data = {0};
 419         struct mmc_request mrq = {NULL};
 420         struct scatterlist sg;
 421         int err;
 422         int is_rpmb = false;
 423         u32 status = 0;
 424
 425         /*
 426          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 427          * whole block device, not on a partition.  This prevents overspray
 428          * between sibling partitions.
 429          */
 430         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 431                 return -EPERM;
 432
 433         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 434         if (IS_ERR(idata))
 435                 return PTR_ERR(idata);
 436
 437         md = mmc_blk_get(bdev->bd_disk);
 438         if (!md) {
 439                 err = -EINVAL;
 440                 goto cmd_err;
 441         }
 442
 443         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 444                 is_rpmb = true;
 445
 446         card = md->queue.card;
 447         if (IS_ERR(card)) {
 448                 err = PTR_ERR(card);
 449                 goto cmd_done;
 450         }
 451
 452         cmd.opcode = idata->ic.opcode;
 453         cmd.arg = idata->ic.arg;
 454         cmd.flags = idata->ic.flags;
 455
 456         if (idata->buf_bytes) {
 457                 data.sg = &sg;
 458                 data.sg_len = 1;
 459                 data.blksz = idata->ic.blksz;
 460                 data.blocks = idata->ic.blocks;
 461
 462                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 463
 464                 if (idata->ic.write_flag)
 465                         data.flags = MMC_DATA_WRITE;
 466                 else
 467                         data.flags = MMC_DATA_READ;
 468
 469                 /* data.flags must already be set before doing this. */
 470                 mmc_set_data_timeout(&data, card);
 471
 472                 /* Allow overriding the timeout_ns for empirical tuning. */
 473                 if (idata->ic.data_timeout_ns)
 474                         data.timeout_ns = idata->ic.data_timeout_ns;
 475
 476                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 477                         /*
 478                          * Pretend this is a data transfer and rely on the
 479                          * host driver to compute timeout.  When all host
 480                          * drivers support cmd.cmd_timeout for R1B, this
 481                          * can be changed to:
 482                          *
 483                          *     mrq.data = NULL;
 484                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 485                          */
 486                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 487                 }
 488
 489                 mrq.data = &data;
 490         }
 491
 492         mrq.cmd = &cmd;
 493
 494         mmc_claim_host(card->host);
 495
 496         err = mmc_blk_part_switch(card, md);
 497         if (err)
 498                 goto cmd_rel_host;
 499
 500         if (idata->ic.is_acmd) {
 501                 err = mmc_app_cmd(card->host, card);
 502                 if (err)
 503                         goto cmd_rel_host;
 504         }
 505
 506         if (is_rpmb) {
 507                 err = mmc_set_blockcount(card, data.blocks,
 508                         idata->ic.write_flag & (1 << 31));
 509                 if (err)
 510                         goto cmd_rel_host;
 511         }
 512
 513         mmc_wait_for_req(card->host, &mrq);
 514
 515         if (cmd.error) {
 516                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 517                                                 __func__, cmd.error);
 518                 err = cmd.error;
 519                 goto cmd_rel_host;
 520         }
 521         if (data.error) {
 522                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 523                                                 __func__, data.error);
 524                 err = data.error;
 525                 goto cmd_rel_host;
 526         }
 527
 528         /*
 529          * According to the SD specs, some commands require a delay after
 530          * issuing the command.
 531          */
 532         if (idata->ic.postsleep_min_us)
 533                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 534
 535         if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
 536                 err = -EFAULT;
 537                 goto cmd_rel_host;
 538         }
 539
 540         if (!idata->ic.write_flag) {
 541                 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
 542                                                 idata->buf, idata->buf_bytes)) {
 543                         err = -EFAULT;
 544                         goto cmd_rel_host;
 545                 }
 546         }
 547
 548         if (is_rpmb) {
 549                 /*
 550                  * Ensure RPMB command has completed by polling CMD13
 551                  * "Send Status".
 552                  */
 553                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 554                 if (err)
 555                         dev_err(mmc_dev(card->host),
 556                                         "%s: Card Status=0x%08X, error %d\n",
 557                                         __func__, status, err);
 558         }
 559
 560 cmd_rel_host:
 561         mmc_release_host(card->host);
 562
 563 cmd_done:
 564         mmc_blk_put(md);
 565 cmd_err:
 566         kfree(idata->buf);
 567         kfree(idata);
 568         return err;
 569 }
 570
 571 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 572         unsigned int cmd, unsigned long arg)
 573 {
 574         int ret = -EINVAL;
 575         if (cmd == MMC_IOC_CMD)
 576                 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
 577         return ret;
 578 }
 579
 580 #ifdef CONFIG_COMPAT
 581 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 582         unsigned int cmd, unsigned long arg)
 583 {
 584         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 585 }
 586 #endif
 587
 588 static const struct block_device_operations mmc_bdops = {
 589         .open                   = mmc_blk_open,
 590         .release                = mmc_blk_release,
 591         .getgeo                 = mmc_blk_getgeo,
 592         .owner                  = THIS_MODULE,
 593         .ioctl                  = mmc_blk_ioctl,
 594 #ifdef CONFIG_COMPAT
 595         .compat_ioctl           = mmc_blk_compat_ioctl,
 596 #endif
 597 };
 598
 599 static inline int mmc_blk_part_switch(struct mmc_card *card,
 600                                       struct mmc_blk_data *md)
 601 {
 602         int ret;
 603         struct mmc_blk_data *main_md = mmc_get_drvdata(card);
 604
 605         if (main_md->part_curr == md->part_type)
 606                 return 0;
 607
 608         if (mmc_card_mmc(card)) {
 609                 u8 part_config = card->ext_csd.part_config;
 610
 611                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 612                 part_config |= md->part_type;
 613
 614                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 615                                  EXT_CSD_PART_CONFIG, part_config,
 616                                  card->ext_csd.part_time);
 617                 if (ret)
 618                         return ret;
 619
 620                 card->ext_csd.part_config = part_config;
 621         }
 622
 623         main_md->part_curr = md->part_type;
 624         return 0;
 625 }
 626
 627 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 628 {
 629         int err;
 630         u32 result;
 631         __be32 *blocks;
 632
 633         struct mmc_request mrq = {NULL};
 634         struct mmc_command cmd = {0};
 635         struct mmc_data data = {0};
 636
 637         struct scatterlist sg;
 638
 639         cmd.opcode = MMC_APP_CMD;
 640         cmd.arg = card->rca << 16;
 641         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 642
 643         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 644         if (err)
 645                 return (u32)-1;
 646         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 647                 return (u32)-1;
 648
 649         memset(&cmd, 0, sizeof(struct mmc_command));
 650
 651         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 652         cmd.arg = 0;
 653         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 654
 655         data.blksz = 4;
 656         data.blocks = 1;
 657         data.flags = MMC_DATA_READ;
 658         data.sg = &sg;
 659         data.sg_len = 1;
 660         mmc_set_data_timeout(&data, card);
 661
 662         mrq.cmd = &cmd;
 663         mrq.data = &data;
 664
 665         blocks = kmalloc(4, GFP_KERNEL);
 666         if (!blocks)
 667                 return (u32)-1;
 668
 669         sg_init_one(&sg, blocks, 4);
 670
 671         mmc_wait_for_req(card->host, &mrq);
 672
 673         result = ntohl(*blocks);
 674         kfree(blocks);
 675
 676         if (cmd.error || data.error)
 677                 result = (u32)-1;
 678
 679         return result;
 680 }
 681
 682 static int send_stop(struct mmc_card *card, u32 *status)
 683 {
 684         struct mmc_command cmd = {0};
 685         int err;
 686
 687         cmd.opcode = MMC_STOP_TRANSMISSION;
 688         cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 689         err = mmc_wait_for_cmd(card->host, &cmd, 5);
 690         if (err == 0)
 691                 *status = cmd.resp[0];
 692         return err;
 693 }
 694
 695 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 696 {
 697         struct mmc_command cmd = {0};
 698         int err;
 699
 700         cmd.opcode = MMC_SEND_STATUS;
 701         if (!mmc_host_is_spi(card->host))
 702                 cmd.arg = card->rca << 16;
 703         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 704         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 705         if (err == 0)
 706                 *status = cmd.resp[0];
 707         return err;
 708 }
 709
 710 #define ERR_NOMEDIUM    3
 711 #define ERR_RETRY       2
 712 #define ERR_ABORT       1
 713 #define ERR_CONTINUE    0
 714
 715 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 716         bool status_valid, u32 status)
 717 {
 718         switch (error) {
 719         case -EILSEQ:
 720                 /* response crc error, retry the r/w cmd */
 721                 pr_err("%s: %s sending %s command, card status %#x\n",
 722                         req->rq_disk->disk_name, "response CRC error",
 723                         name, status);
 724                 return ERR_RETRY;
 725
 726         case -ETIMEDOUT:
 727                 pr_err("%s: %s sending %s command, card status %#x\n",
 728                         req->rq_disk->disk_name, "timed out", name, status);
 729
 730                 /* If the status cmd initially failed, retry the r/w cmd */
 731                 if (!status_valid)
 732                         return ERR_RETRY;
 733
 734                 /*
 735                  * If it was a r/w cmd crc error, or illegal command
 736                  * (eg, issued in wrong state) then retry - we should
 737                  * have corrected the state problem above.
 738                  */
 739                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
 740                         return ERR_RETRY;
 741
 742                 /* Otherwise abort the command */
 743                 return ERR_ABORT;
 744
 745         default:
 746                 /* We don't understand the error code the driver gave us */
 747                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 748                        req->rq_disk->disk_name, error, status);
 749                 return ERR_ABORT;
 750         }
 751 }
 752
 753 /*
 754  * Initial r/w and stop cmd error recovery.
 755  * We don't know whether the card received the r/w cmd or not, so try to
 756  * restore things back to a sane state.  Essentially, we do this as follows:
 757  * - Obtain card status.  If the first attempt to obtain card status fails,
 758  *   the status word will reflect the failed status cmd, not the failed
 759  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 760  *   longer communicate with the card.
 761  * - Check the card state.  If the card received the cmd but there was a
 762  *   transient problem with the response, it might still be in a data transfer
 763  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 764  * - If the r/w cmd failed due to a response CRC error, it was probably
 765  *   transient, so retry the cmd.
 766  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 767  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 768  *   illegal cmd, retry.
 769  * Otherwise we don't understand what happened, so abort.
 770  */
 771 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 772         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 773 {
 774         bool prev_cmd_status_valid = true;
 775         u32 status, stop_status = 0;
 776         int err, retry;
 777
 778         if (mmc_card_removed(card))
 779                 return ERR_NOMEDIUM;
 780
 781         /*
 782          * Try to get card status which indicates both the card state
 783          * and why there was no response.  If the first attempt fails,
 784          * we can't be sure the returned status is for the r/w command.
 785          */
 786         for (retry = 2; retry >= 0; retry--) {
 787                 err = get_card_status(card, &status, 0);
 788                 if (!err)
 789                         break;
 790
 791                 prev_cmd_status_valid = false;
 792                 pr_err("%s: error %d sending status command, %sing\n",
 793                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
 794         }
 795
 796         /* We couldn't get a response from the card.  Give up. */
 797         if (err) {
 798                 /* Check if the card is removed */
 799                 if (mmc_detect_card_removed(card->host))
 800                         return ERR_NOMEDIUM;
 801                 return ERR_ABORT;
 802         }
 803
 804         /* Flag ECC errors */
 805         if ((status & R1_CARD_ECC_FAILED) ||
 806             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
 807             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
 808                 *ecc_err = 1;
 809
 810         /* Flag General errors */
 811         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
 812                 if ((status & R1_ERROR) ||
 813                         (brq->stop.resp[0] & R1_ERROR)) {
 814                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
 815                                req->rq_disk->disk_name, __func__,
 816                                brq->stop.resp[0], status);
 817                         *gen_err = 1;
 818                 }
 819
 820         /*
 821          * Check the current card state.  If it is in some data transfer
 822          * mode, tell it to stop (and hopefully transition back to TRAN.)
 823          */
 824         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
 825             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
 826                 err = send_stop(card, &stop_status);
 827                 if (err)
 828                         pr_err("%s: error %d sending stop command\n",
 829                                req->rq_disk->disk_name, err);
 830
 831                 /*
 832                  * If the stop cmd also timed out, the card is probably
 833                  * not present, so abort.  Other errors are bad news too.
 834                  */
 835                 if (err)
 836                         return ERR_ABORT;
 837                 if (stop_status & R1_CARD_ECC_FAILED)
 838                         *ecc_err = 1;
 839                 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
 840                         if (stop_status & R1_ERROR) {
 841                                 pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
 842                                        req->rq_disk->disk_name, __func__,
 843                                        stop_status);
 844                                 *gen_err = 1;
 845                         }
 846         }
 847
 848         /* Check for set block count errors */
 849         if (brq->sbc.error)
 850                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
 851                                 prev_cmd_status_valid, status);
 852
 853         /* Check for r/w command errors */
 854         if (brq->cmd.error)
 855                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
 856                                 prev_cmd_status_valid, status);
 857
 858         /* Data errors */
 859         if (!brq->stop.error)
 860                 return ERR_CONTINUE;
 861
 862         /* Now for stop errors.  These aren't fatal to the transfer. */
 863         pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
 864                req->rq_disk->disk_name, brq->stop.error,
 865                brq->cmd.resp[0], status);
 866
 867         /*
 868          * Subsitute in our own stop status as this will give the error
 869          * state which happened during the execution of the r/w command.
 870          */
 871         if (stop_status) {
 872                 brq->stop.resp[0] = stop_status;
 873                 brq->stop.error = 0;
 874         }
 875         return ERR_CONTINUE;
 876 }
 877
 878 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
 879                          int type)
 880 {
 881         int err;
 882
 883         if (md->reset_done & type)
 884                 return -EEXIST;
 885
 886         md->reset_done |= type;
 887         err = mmc_hw_reset(host);
 888         /* Ensure we switch back to the correct partition */
 889         if (err != -EOPNOTSUPP) {
 890                 struct mmc_blk_data *main_md = mmc_get_drvdata(host->card);
 891                 int part_err;
 892
 893                 main_md->part_curr = main_md->part_type;
 894                 part_err = mmc_blk_part_switch(host->card, md);
 895                 if (part_err) {
 896                         /*
 897                          * We have failed to get back into the correct
 898                          * partition, so we need to abort the whole request.
 899                          */
 900                         return -ENODEV;
 901                 }
 902         }
 903         return err;
 904 }
 905
 906 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
 907 {
 908         md->reset_done &= ~type;
 909 }
 910
 911 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
 912 {
 913         struct mmc_blk_data *md = mq->data;
 914         struct mmc_card *card = md->queue.card;
 915         unsigned int from, nr, arg;
 916         int err = 0, type = MMC_BLK_DISCARD;
 917
 918         if (!mmc_can_erase(card)) {
 919                 err = -EOPNOTSUPP;
 920                 goto out;
 921         }
 922
 923         from = blk_rq_pos(req);
 924         nr = blk_rq_sectors(req);
 925
 926         if (mmc_can_discard(card))
 927                 arg = MMC_DISCARD_ARG;
 928         else if (mmc_can_trim(card))
 929                 arg = MMC_TRIM_ARG;
 930         else
 931                 arg = MMC_ERASE_ARG;
 932 retry:
 933         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
 934                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 935                                  INAND_CMD38_ARG_EXT_CSD,
 936                                  arg == MMC_TRIM_ARG ?
 937                                  INAND_CMD38_ARG_TRIM :
 938                                  INAND_CMD38_ARG_ERASE,
 939                                  0);
 940                 if (err)
 941                         goto out;
 942         }
 943         err = mmc_erase(card, from, nr, arg);
 944 out:
 945         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
 946                 goto retry;
 947         if (!err)
 948                 mmc_blk_reset_success(md, type);
 949         blk_end_request(req, err, blk_rq_bytes(req));
 950
 951         return err ? 0 : 1;
 952 }
 953
 954 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
 955                                        struct request *req)
 956 {
 957         struct mmc_blk_data *md = mq->data;
 958         struct mmc_card *card = md->queue.card;
 959         unsigned int from, nr, arg, trim_arg, erase_arg;
 960         int err = 0, type = MMC_BLK_SECDISCARD;
 961
 962         if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
 963                 err = -EOPNOTSUPP;
 964                 goto out;
 965         }
 966
 967         from = blk_rq_pos(req);
 968         nr = blk_rq_sectors(req);
 969
 970         /* The sanitize operation is supported at v4.5 only */
 971         if (mmc_can_sanitize(card)) {
 972                 erase_arg = MMC_ERASE_ARG;
 973                 trim_arg = MMC_TRIM_ARG;
 974         } else {
 975                 erase_arg = MMC_SECURE_ERASE_ARG;
 976                 trim_arg = MMC_SECURE_TRIM1_ARG;
 977         }
 978
 979         if (mmc_erase_group_aligned(card, from, nr))
 980                 arg = erase_arg;
 981         else if (mmc_can_trim(card))
 982                 arg = trim_arg;
 983         else {
 984                 err = -EINVAL;
 985                 goto out;
 986         }
 987 retry:
 988         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
 989                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 990                                  INAND_CMD38_ARG_EXT_CSD,
 991                                  arg == MMC_SECURE_TRIM1_ARG ?
 992                                  INAND_CMD38_ARG_SECTRIM1 :
 993                                  INAND_CMD38_ARG_SECERASE,
 994                                  0);
 995                 if (err)
 996                         goto out_retry;
 997         }
 998
 999         err = mmc_erase(card, from, nr, arg);
1000         if (err == -EIO)
1001                 goto out_retry;
1002         if (err)
1003                 goto out;
1004
1005         if (arg == MMC_SECURE_TRIM1_ARG) {
1006                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1007                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1008                                          INAND_CMD38_ARG_EXT_CSD,
1009                                          INAND_CMD38_ARG_SECTRIM2,
1010                                          0);
1011                         if (err)
1012                                 goto out_retry;
1013                 }
1014
1015                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1016                 if (err == -EIO)
1017                         goto out_retry;
1018                 if (err)
1019                         goto out;
1020         }
1021
1022         if (mmc_can_sanitize(card))
1023                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1024                                  EXT_CSD_SANITIZE_START, 1, 0);
1025 out_retry:
1026         if (err && !mmc_blk_reset(md, card->host, type))
1027                 goto retry;
1028         if (!err)
1029                 mmc_blk_reset_success(md, type);
1030 out:
1031         blk_end_request(req, err, blk_rq_bytes(req));
1032
1033         return err ? 0 : 1;
1034 }
1035
1036 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1037 {
1038         struct mmc_blk_data *md = mq->data;
1039         struct mmc_card *card = md->queue.card;
1040         int ret = 0;
1041
1042         ret = mmc_flush_cache(card);
1043         if (ret)
1044                 ret = -EIO;
1045
1046         blk_end_request_all(req, ret);
1047
1048         return ret ? 0 : 1;
1049 }
1050
1051 /*
1052  * Reformat current write as a reliable write, supporting
1053  * both legacy and the enhanced reliable write MMC cards.
1054  * In each transfer we'll handle only as much as a single
1055  * reliable write can handle, thus finish the request in
1056  * partial completions.
1057  */
1058 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1059                                     struct mmc_card *card,
1060                                     struct request *req)
1061 {
1062         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1063                 /* Legacy mode imposes restrictions on transfers. */
1064                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1065                         brq->data.blocks = 1;
1066
1067                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1068                         brq->data.blocks = card->ext_csd.rel_sectors;
1069                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1070                         brq->data.blocks = 1;
1071         }
1072 }
1073
1074 #define CMD_ERRORS                                                      \
1075         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1076          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1077          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1078          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1079          R1_CC_ERROR |          /* Card controller error */             \
1080          R1_ERROR)              /* General/unknown error */
1081
1082 static int mmc_blk_err_check(struct mmc_card *card,
1083                              struct mmc_async_req *areq)
1084 {
1085         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1086                                                     mmc_active);
1087         struct mmc_blk_request *brq = &mq_mrq->brq;
1088         struct request *req = mq_mrq->req;
1089         int ecc_err = 0, gen_err = 0;
1090
1091         /*
1092          * sbc.error indicates a problem with the set block count
1093          * command.  No data will have been transferred.
1094          *
1095          * cmd.error indicates a problem with the r/w command.  No
1096          * data will have been transferred.
1097          *
1098          * stop.error indicates a problem with the stop command.  Data
1099          * may have been transferred, or may still be transferring.
1100          */
1101         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1102             brq->data.error) {
1103                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1104                 case ERR_RETRY:
1105                         return MMC_BLK_RETRY;
1106                 case ERR_ABORT:
1107                         return MMC_BLK_ABORT;
1108                 case ERR_NOMEDIUM:
1109                         return MMC_BLK_NOMEDIUM;
1110                 case ERR_CONTINUE:
1111                         break;
1112                 }
1113         }
1114
1115         /*
1116          * Check for errors relating to the execution of the
1117          * initial command - such as address errors.  No data
1118          * has been transferred.
1119          */
1120         if (brq->cmd.resp[0] & CMD_ERRORS) {
1121                 pr_err("%s: r/w command failed, status = %#x\n",
1122                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1123                 return MMC_BLK_ABORT;
1124         }
1125
1126         /*
1127          * Everything else is either success, or a data error of some
1128          * kind.  If it was a write, we may have transitioned to
1129          * program mode, which we have to wait for it to complete.
1130          */
1131         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1132                 u32 status;
1133                 unsigned long timeout;
1134
1135                 /* Check stop command response */
1136                 if (brq->stop.resp[0] & R1_ERROR) {
1137                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1138                                req->rq_disk->disk_name, __func__,
1139                                brq->stop.resp[0]);
1140                         gen_err = 1;
1141                 }
1142
1143                 timeout = jiffies + msecs_to_jiffies(MMC_BLK_TIMEOUT_MS);
1144                 do {
1145                         int err = get_card_status(card, &status, 5);
1146                         if (err) {
1147                                 pr_err("%s: error %d requesting status\n",
1148                                        req->rq_disk->disk_name, err);
1149                                 return MMC_BLK_CMD_ERR;
1150                         }
1151
1152                         if (status & R1_ERROR) {
1153                                 pr_err("%s: %s: general error sending status command, card status %#x\n",
1154                                        req->rq_disk->disk_name, __func__,
1155                                        status);
1156                                 gen_err = 1;
1157                         }
1158
1159                         /* Timeout if the device never becomes ready for data
1160                          * and never leaves the program state.
1161                          */
1162                         if (time_after(jiffies, timeout)) {
1163                                 pr_err("%s: Card stuck in programming state!"\
1164                                         " %s %s\n", mmc_hostname(card->host),
1165                                         req->rq_disk->disk_name, __func__);
1166
1167                                 return MMC_BLK_CMD_ERR;
1168                         }
1169                         /*
1170                          * Some cards mishandle the status bits,
1171                          * so make sure to check both the busy
1172                          * indication and the card state.
1173                          */
1174                 } while (!(status & R1_READY_FOR_DATA) ||
1175                          (R1_CURRENT_STATE(status) == R1_STATE_PRG));
1176         }
1177
1178         /* if general error occurs, retry the write operation. */
1179         if (gen_err) {
1180                 pr_warn("%s: retrying write for general error\n",
1181                                 req->rq_disk->disk_name);
1182                 return MMC_BLK_RETRY;
1183         }
1184
1185         if (brq->data.error) {
1186                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1187                        req->rq_disk->disk_name, brq->data.error,
1188                        (unsigned)blk_rq_pos(req),
1189                        (unsigned)blk_rq_sectors(req),
1190                        brq->cmd.resp[0], brq->stop.resp[0]);
1191
1192                 if (rq_data_dir(req) == READ) {
1193                         if (ecc_err)
1194                                 return MMC_BLK_ECC_ERR;
1195                         return MMC_BLK_DATA_ERR;
1196                 } else {
1197                         return MMC_BLK_CMD_ERR;
1198                 }
1199         }
1200
1201         if (!brq->data.bytes_xfered)
1202                 return MMC_BLK_RETRY;
1203
1204         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1205                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1206                         return MMC_BLK_PARTIAL;
1207                 else
1208                         return MMC_BLK_SUCCESS;
1209         }
1210
1211         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1212                 return MMC_BLK_PARTIAL;
1213
1214         return MMC_BLK_SUCCESS;
1215 }
1216
1217 static int mmc_blk_packed_err_check(struct mmc_card *card,
1218                                     struct mmc_async_req *areq)
1219 {
1220         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1221                         mmc_active);
1222         struct request *req = mq_rq->req;
1223         struct mmc_packed *packed = mq_rq->packed;
1224         int err, check, status;
1225         u8 *ext_csd;
1226
1227         BUG_ON(!packed);
1228
1229         packed->retries--;
1230         check = mmc_blk_err_check(card, areq);
1231         err = get_card_status(card, &status, 0);
1232         if (err) {
1233                 pr_err("%s: error %d sending status command\n",
1234                        req->rq_disk->disk_name, err);
1235                 return MMC_BLK_ABORT;
1236         }
1237
1238         if (status & R1_EXCEPTION_EVENT) {
1239                 ext_csd = kzalloc(512, GFP_KERNEL);
1240                 if (!ext_csd) {
1241                         pr_err("%s: unable to allocate buffer for ext_csd\n",
1242                                req->rq_disk->disk_name);
1243                         return -ENOMEM;
1244                 }
1245
1246                 err = mmc_send_ext_csd(card, ext_csd);
1247                 if (err) {
1248                         pr_err("%s: error %d sending ext_csd\n",
1249                                req->rq_disk->disk_name, err);
1250                         check = MMC_BLK_ABORT;
1251                         goto free;
1252                 }
1253
1254                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1255                      EXT_CSD_PACKED_FAILURE) &&
1256                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1257                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1258                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1259                             EXT_CSD_PACKED_INDEXED_ERROR) {
1260                                 packed->idx_failure =
1261                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1262                                 check = MMC_BLK_PARTIAL;
1263                         }
1264                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1265                                "failure index: %d\n",
1266                                req->rq_disk->disk_name, packed->nr_entries,
1267                                packed->blocks, packed->idx_failure);
1268                 }
1269 free:
1270                 kfree(ext_csd);
1271         }
1272
1273         return check;
1274 }
1275
1276 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1277                                struct mmc_card *card,
1278                                int disable_multi,
1279                                struct mmc_queue *mq)
1280 {
1281         u32 readcmd, writecmd;
1282         struct mmc_blk_request *brq = &mqrq->brq;
1283         struct request *req = mqrq->req;
1284         struct mmc_blk_data *md = mq->data;
1285         bool do_data_tag;
1286
1287         /*
1288          * Reliable writes are used to implement Forced Unit Access and
1289          * REQ_META accesses, and are supported only on MMCs.
1290          *
1291          * XXX: this really needs a good explanation of why REQ_META
1292          * is treated special.
1293          */
1294         bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1295                           (req->cmd_flags & REQ_META)) &&
1296                 (rq_data_dir(req) == WRITE) &&
1297                 (md->flags & MMC_BLK_REL_WR);
1298
1299         memset(brq, 0, sizeof(struct mmc_blk_request));
1300         brq->mrq.cmd = &brq->cmd;
1301         brq->mrq.data = &brq->data;
1302
1303         brq->cmd.arg = blk_rq_pos(req);
1304         if (!mmc_card_blockaddr(card))
1305                 brq->cmd.arg <<= 9;
1306         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1307         brq->data.blksz = 512;
1308         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1309         brq->stop.arg = 0;
1310         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1311         brq->data.blocks = blk_rq_sectors(req);
1312
1313         /*
1314          * The block layer doesn't support all sector count
1315          * restrictions, so we need to be prepared for too big
1316          * requests.
1317          */
1318         if (brq->data.blocks > card->host->max_blk_count)
1319                 brq->data.blocks = card->host->max_blk_count;
1320
1321         if (brq->data.blocks > 1) {
1322                 /*
1323                  * After a read error, we redo the request one sector
1324                  * at a time in order to accurately determine which
1325                  * sectors can be read successfully.
1326                  */
1327                 if (disable_multi)
1328                         brq->data.blocks = 1;
1329
1330                 /* Some controllers can't do multiblock reads due to hw bugs */
1331                 if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
1332                     rq_data_dir(req) == READ)
1333                         brq->data.blocks = 1;
1334         }
1335
1336         if (brq->data.blocks > 1 || do_rel_wr) {
1337                 /* SPI multiblock writes terminate using a special
1338                  * token, not a STOP_TRANSMISSION request.
1339                  */
1340                 if (!mmc_host_is_spi(card->host) ||
1341                     rq_data_dir(req) == READ)
1342                         brq->mrq.stop = &brq->stop;
1343                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1344                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1345         } else {
1346                 brq->mrq.stop = NULL;
1347                 readcmd = MMC_READ_SINGLE_BLOCK;
1348                 writecmd = MMC_WRITE_BLOCK;
1349         }
1350         if (rq_data_dir(req) == READ) {
1351                 brq->cmd.opcode = readcmd;
1352                 brq->data.flags |= MMC_DATA_READ;
1353         } else {
1354                 brq->cmd.opcode = writecmd;
1355                 brq->data.flags |= MMC_DATA_WRITE;
1356         }
1357
1358         if (do_rel_wr)
1359                 mmc_apply_rel_rw(brq, card, req);
1360
1361         /*
1362          * Data tag is used only during writing meta data to speed
1363          * up write and any subsequent read of this meta data
1364          */
1365         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1366                 (req->cmd_flags & REQ_META) &&
1367                 (rq_data_dir(req) == WRITE) &&
1368                 ((brq->data.blocks * brq->data.blksz) >=
1369                  card->ext_csd.data_tag_unit_size);
1370
1371         /*
1372          * Pre-defined multi-block transfers are preferable to
1373          * open ended-ones (and necessary for reliable writes).
1374          * However, it is not sufficient to just send CMD23,
1375          * and avoid the final CMD12, as on an error condition
1376          * CMD12 (stop) needs to be sent anyway. This, coupled
1377          * with Auto-CMD23 enhancements provided by some
1378          * hosts, means that the complexity of dealing
1379          * with this is best left to the host. If CMD23 is
1380          * supported by card and host, we'll fill sbc in and let
1381          * the host deal with handling it correctly. This means
1382          * that for hosts that don't expose MMC_CAP_CMD23, no
1383          * change of behavior will be observed.
1384          *
1385          * N.B: Some MMC cards experience perf degradation.
1386          * We'll avoid using CMD23-bounded multiblock writes for
1387          * these, while retaining features like reliable writes.
1388          */
1389         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1390             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1391              do_data_tag)) {
1392                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1393                 brq->sbc.arg = brq->data.blocks |
1394                         (do_rel_wr ? (1 << 31) : 0) |
1395                         (do_data_tag ? (1 << 29) : 0);
1396                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1397                 brq->mrq.sbc = &brq->sbc;
1398         }
1399
1400         mmc_set_data_timeout(&brq->data, card);
1401
1402         brq->data.sg = mqrq->sg;
1403         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1404
1405         /*
1406          * Adjust the sg list so it is the same size as the
1407          * request.
1408          */
1409         if (brq->data.blocks != blk_rq_sectors(req)) {
1410                 int i, data_size = brq->data.blocks << 9;
1411                 struct scatterlist *sg;
1412
1413                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1414                         data_size -= sg->length;
1415                         if (data_size <= 0) {
1416                                 sg->length += data_size;
1417                                 i++;
1418                                 break;
1419                         }
1420                 }
1421                 brq->data.sg_len = i;
1422         }
1423
1424         mqrq->mmc_active.mrq = &brq->mrq;
1425         mqrq->mmc_active.err_check = mmc_blk_err_check;
1426
1427         mmc_queue_bounce_pre(mqrq);
1428 }
1429
1430 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1431                                           struct mmc_card *card)
1432 {
1433         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1434         unsigned int max_seg_sz = queue_max_segment_size(q);
1435         unsigned int len, nr_segs = 0;
1436
1437         do {
1438                 len = min(hdr_sz, max_seg_sz);
1439                 hdr_sz -= len;
1440                 nr_segs++;
1441         } while (hdr_sz);
1442
1443         return nr_segs;
1444 }
1445
1446 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1447 {
1448         struct request_queue *q = mq->queue;
1449         struct mmc_card *card = mq->card;
1450         struct request *cur = req, *next = NULL;
1451         struct mmc_blk_data *md = mq->data;
1452         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1453         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1454         unsigned int req_sectors = 0, phys_segments = 0;
1455         unsigned int max_blk_count, max_phys_segs;
1456         bool put_back = true;
1457         u8 max_packed_rw = 0;
1458         u8 reqs = 0;
1459
1460         if (!(md->flags & MMC_BLK_PACKED_CMD))
1461                 goto no_packed;
1462
1463         if ((rq_data_dir(cur) == WRITE) &&
1464             mmc_host_packed_wr(card->host))
1465                 max_packed_rw = card->ext_csd.max_packed_writes;
1466
1467         if (max_packed_rw == 0)
1468                 goto no_packed;
1469
1470         if (mmc_req_rel_wr(cur) &&
1471             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1472                 goto no_packed;
1473
1474         if (mmc_large_sector(card) &&
1475             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1476                 goto no_packed;
1477
1478         mmc_blk_clear_packed(mqrq);
1479
1480         max_blk_count = min(card->host->max_blk_count,
1481                             card->host->max_req_size >> 9);
1482         if (unlikely(max_blk_count > 0xffff))
1483                 max_blk_count = 0xffff;
1484
1485         max_phys_segs = queue_max_segments(q);
1486         req_sectors += blk_rq_sectors(cur);
1487         phys_segments += cur->nr_phys_segments;
1488
1489         if (rq_data_dir(cur) == WRITE) {
1490                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1491                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1492         }
1493
1494         do {
1495                 if (reqs >= max_packed_rw - 1) {
1496                         put_back = false;
1497                         break;
1498                 }
1499
1500                 spin_lock_irq(q->queue_lock);
1501                 next = blk_fetch_request(q);
1502                 spin_unlock_irq(q->queue_lock);
1503                 if (!next) {
1504                         put_back = false;
1505                         break;
1506                 }
1507
1508                 if (mmc_large_sector(card) &&
1509                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1510                         break;
1511
1512                 if (next->cmd_flags & REQ_DISCARD ||
1513                     next->cmd_flags & REQ_FLUSH)
1514                         break;
1515
1516                 if (rq_data_dir(cur) != rq_data_dir(next))
1517                         break;
1518
1519                 if (mmc_req_rel_wr(next) &&
1520                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1521                         break;
1522
1523                 req_sectors += blk_rq_sectors(next);
1524                 if (req_sectors > max_blk_count)
1525                         break;
1526
1527                 phys_segments +=  next->nr_phys_segments;
1528                 if (phys_segments > max_phys_segs)
1529                         break;
1530
1531                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1532                 cur = next;
1533                 reqs++;
1534         } while (1);
1535
1536         if (put_back) {
1537                 spin_lock_irq(q->queue_lock);
1538                 blk_requeue_request(q, next);
1539                 spin_unlock_irq(q->queue_lock);
1540         }
1541
1542         if (reqs > 0) {
1543                 list_add(&req->queuelist, &mqrq->packed->list);
1544                 mqrq->packed->nr_entries = ++reqs;
1545                 mqrq->packed->retries = reqs;
1546                 return reqs;
1547         }
1548
1549 no_packed:
1550         mqrq->cmd_type = MMC_PACKED_NONE;
1551         return 0;
1552 }
1553
1554 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1555                                         struct mmc_card *card,
1556                                         struct mmc_queue *mq)
1557 {
1558         struct mmc_blk_request *brq = &mqrq->brq;
1559         struct request *req = mqrq->req;
1560         struct request *prq;
1561         struct mmc_blk_data *md = mq->data;
1562         struct mmc_packed *packed = mqrq->packed;
1563         bool do_rel_wr, do_data_tag;
1564         u32 *packed_cmd_hdr;
1565         u8 hdr_blocks;
1566         u8 i = 1;
1567
1568         BUG_ON(!packed);
1569
1570         mqrq->cmd_type = MMC_PACKED_WRITE;
1571         packed->blocks = 0;
1572         packed->idx_failure = MMC_PACKED_NR_IDX;
1573
1574         packed_cmd_hdr = packed->cmd_hdr;
1575         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1576         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1577                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1578         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1579
1580         /*
1581          * Argument for each entry of packed group
1582          */
1583         list_for_each_entry(prq, &packed->list, queuelist) {
1584                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1585                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1586                         (prq->cmd_flags & REQ_META) &&
1587                         (rq_data_dir(prq) == WRITE) &&
1588                         ((brq->data.blocks * brq->data.blksz) >=
1589                          card->ext_csd.data_tag_unit_size);
1590                 /* Argument of CMD23 */
1591                 packed_cmd_hdr[(i * 2)] =
1592                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1593                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1594                         blk_rq_sectors(prq);
1595                 /* Argument of CMD18 or CMD25 */
1596                 packed_cmd_hdr[((i * 2)) + 1] =
1597                         mmc_card_blockaddr(card) ?
1598                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1599                 packed->blocks += blk_rq_sectors(prq);
1600                 i++;
1601         }
1602
1603         memset(brq, 0, sizeof(struct mmc_blk_request));
1604         brq->mrq.cmd = &brq->cmd;
1605         brq->mrq.data = &brq->data;
1606         brq->mrq.sbc = &brq->sbc;
1607         brq->mrq.stop = &brq->stop;
1608
1609         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1610         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1611         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1612
1613         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1614         brq->cmd.arg = blk_rq_pos(req);
1615         if (!mmc_card_blockaddr(card))
1616                 brq->cmd.arg <<= 9;
1617         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1618
1619         brq->data.blksz = 512;
1620         brq->data.blocks = packed->blocks + hdr_blocks;
1621         brq->data.flags |= MMC_DATA_WRITE;
1622
1623         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1624         brq->stop.arg = 0;
1625         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1626
1627         mmc_set_data_timeout(&brq->data, card);
1628
1629         brq->data.sg = mqrq->sg;
1630         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1631
1632         mqrq->mmc_active.mrq = &brq->mrq;
1633         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1634
1635         mmc_queue_bounce_pre(mqrq);
1636 }
1637
1638 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1639                            struct mmc_blk_request *brq, struct request *req,
1640                            int ret)
1641 {
1642         struct mmc_queue_req *mq_rq;
1643         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1644
1645         /*
1646          * If this is an SD card and we're writing, we can first
1647          * mark the known good sectors as ok.
1648          *
1649          * If the card is not SD, we can still ok written sectors
1650          * as reported by the controller (which might be less than
1651          * the real number of written sectors, but never more).
1652          */
1653         if (mmc_card_sd(card)) {
1654                 u32 blocks;
1655
1656                 blocks = mmc_sd_num_wr_blocks(card);
1657                 if (blocks != (u32)-1) {
1658                         ret = blk_end_request(req, 0, blocks << 9);
1659                 }
1660         } else {
1661                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1662                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1663         }
1664         return ret;
1665 }
1666
1667 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1668 {
1669         struct request *prq;
1670         struct mmc_packed *packed = mq_rq->packed;
1671         int idx = packed->idx_failure, i = 0;
1672         int ret = 0;
1673
1674         BUG_ON(!packed);
1675
1676         while (!list_empty(&packed->list)) {
1677                 prq = list_entry_rq(packed->list.next);
1678                 if (idx == i) {
1679                         /* retry from error index */
1680                         packed->nr_entries -= idx;
1681                         mq_rq->req = prq;
1682                         ret = 1;
1683
1684                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1685                                 list_del_init(&prq->queuelist);
1686                                 mmc_blk_clear_packed(mq_rq);
1687                         }
1688                         return ret;
1689                 }
1690                 list_del_init(&prq->queuelist);
1691                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1692                 i++;
1693         }
1694
1695         mmc_blk_clear_packed(mq_rq);
1696         return ret;
1697 }
1698
1699 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1700 {
1701         struct request *prq;
1702         struct mmc_packed *packed = mq_rq->packed;
1703
1704         BUG_ON(!packed);
1705
1706         while (!list_empty(&packed->list)) {
1707                 prq = list_entry_rq(packed->list.next);
1708                 list_del_init(&prq->queuelist);
1709                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1710         }
1711
1712         mmc_blk_clear_packed(mq_rq);
1713 }
1714
1715 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1716                                       struct mmc_queue_req *mq_rq)
1717 {
1718         struct request *prq;
1719         struct request_queue *q = mq->queue;
1720         struct mmc_packed *packed = mq_rq->packed;
1721
1722         BUG_ON(!packed);
1723
1724         while (!list_empty(&packed->list)) {
1725                 prq = list_entry_rq(packed->list.prev);
1726                 if (prq->queuelist.prev != &packed->list) {
1727                         list_del_init(&prq->queuelist);
1728                         spin_lock_irq(q->queue_lock);
1729                         blk_requeue_request(mq->queue, prq);
1730                         spin_unlock_irq(q->queue_lock);
1731                 } else {
1732                         list_del_init(&prq->queuelist);
1733                 }
1734         }
1735
1736         mmc_blk_clear_packed(mq_rq);
1737 }
1738
1739 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1740 {
1741         struct mmc_blk_data *md = mq->data;
1742         struct mmc_card *card = md->queue.card;
1743         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1744         int ret = 1, disable_multi = 0, retry = 0, type;
1745         enum mmc_blk_status status;
1746         struct mmc_queue_req *mq_rq;
1747         struct request *req = rqc;
1748         struct mmc_async_req *areq;
1749         const u8 packed_nr = 2;
1750         u8 reqs = 0;
1751
1752         if (!rqc && !mq->mqrq_prev->req)
1753                 return 0;
1754
1755         if (rqc)
1756                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1757
1758         do {
1759                 if (rqc) {
1760                         /*
1761                          * When 4KB native sector is enabled, only 8 blocks
1762                          * multiple read or write is allowed
1763                          */
1764                         if ((brq->data.blocks & 0x07) &&
1765                             (card->ext_csd.data_sector_size == 4096)) {
1766                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1767                                         req->rq_disk->disk_name);
1768                                 mq_rq = mq->mqrq_cur;
1769                                 goto cmd_abort;
1770                         }
1771
1772                         if (reqs >= packed_nr)
1773                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1774                                                             card, mq);
1775                         else
1776                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1777                         areq = &mq->mqrq_cur->mmc_active;
1778                 } else
1779                         areq = NULL;
1780                 areq = mmc_start_req(card->host, areq, (int *) &status);
1781                 if (!areq) {
1782                         if (status == MMC_BLK_NEW_REQUEST)
1783                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1784                         return 0;
1785                 }
1786
1787                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1788                 brq = &mq_rq->brq;
1789                 req = mq_rq->req;
1790                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1791                 mmc_queue_bounce_post(mq_rq);
1792
1793                 switch (status) {
1794                 case MMC_BLK_SUCCESS:
1795                 case MMC_BLK_PARTIAL:
1796                         /*
1797                          * A block was successfully transferred.
1798                          */
1799                         mmc_blk_reset_success(md, type);
1800
1801                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1802                                 ret = mmc_blk_end_packed_req(mq_rq);
1803                                 break;
1804                         } else {
1805                                 ret = blk_end_request(req, 0,
1806                                                 brq->data.bytes_xfered);
1807                         }
1808
1809                         /*
1810                          * If the blk_end_request function returns non-zero even
1811                          * though all data has been transferred and no errors
1812                          * were returned by the host controller, it's a bug.
1813                          */
1814                         if (status == MMC_BLK_SUCCESS && ret) {
1815                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1816                                        __func__, blk_rq_bytes(req),
1817                                        brq->data.bytes_xfered);
1818                                 rqc = NULL;
1819                                 goto cmd_abort;
1820                         }
1821                         break;
1822                 case MMC_BLK_CMD_ERR:
1823                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1824                         if (!mmc_blk_reset(md, card->host, type))
1825                                 break;
1826                         goto cmd_abort;
1827                 case MMC_BLK_RETRY:
1828                         if (retry++ < 5)
1829                                 break;
1830                         /* Fall through */
1831                 case MMC_BLK_ABORT:
1832                         if (!mmc_blk_reset(md, card->host, type))
1833                                 break;
1834                         goto cmd_abort;
1835                 case MMC_BLK_DATA_ERR: {
1836                         int err;
1837
1838                         err = mmc_blk_reset(md, card->host, type);
1839                         if (!err)
1840                                 break;
1841                         if (err == -ENODEV ||
1842                                 mmc_packed_cmd(mq_rq->cmd_type))
1843                                 goto cmd_abort;
1844                         /* Fall through */
1845                 }
1846                 case MMC_BLK_ECC_ERR:
1847                         if (brq->data.blocks > 1) {
1848                                 /* Redo read one sector at a time */
1849                                 pr_warning("%s: retrying using single block read\n",
1850                                            req->rq_disk->disk_name);
1851                                 disable_multi = 1;
1852                                 break;
1853                         }
1854                         /*
1855                          * After an error, we redo I/O one sector at a
1856                          * time, so we only reach here after trying to
1857                          * read a single sector.
1858                          */
1859                         ret = blk_end_request(req, -EIO,
1860                                                 brq->data.blksz);
1861                         if (!ret)
1862                                 goto start_new_req;
1863                         break;
1864                 case MMC_BLK_NOMEDIUM:
1865                         goto cmd_abort;
1866                 default:
1867                         pr_err("%s: Unhandled return value (%d)",
1868                                         req->rq_disk->disk_name, status);
1869                         goto cmd_abort;
1870                 }
1871
1872                 if (ret) {
1873                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1874                                 if (!mq_rq->packed->retries)
1875                                         goto cmd_abort;
1876                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
1877                                 mmc_start_req(card->host,
1878                                               &mq_rq->mmc_active, NULL);
1879                         } else {
1880
1881                                 /*
1882                                  * In case of a incomplete request
1883                                  * prepare it again and resend.
1884                                  */
1885                                 mmc_blk_rw_rq_prep(mq_rq, card,
1886                                                 disable_multi, mq);
1887                                 mmc_start_req(card->host,
1888                                                 &mq_rq->mmc_active, NULL);
1889                         }
1890                 }
1891         } while (ret);
1892
1893         return 1;
1894
1895  cmd_abort:
1896         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1897                 mmc_blk_abort_packed_req(mq_rq);
1898         } else {
1899                 if (mmc_card_removed(card))
1900                         req->cmd_flags |= REQ_QUIET;
1901                 while (ret)
1902                         ret = blk_end_request(req, -EIO,
1903                                         blk_rq_cur_bytes(req));
1904         }
1905
1906  start_new_req:
1907         if (rqc) {
1908                 if (mmc_card_removed(card)) {
1909                         rqc->cmd_flags |= REQ_QUIET;
1910                         blk_end_request_all(rqc, -EIO);
1911                 } else {
1912                         /*
1913                          * If current request is packed, it needs to put back.
1914                          */
1915                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
1916                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
1917
1918                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1919                         mmc_start_req(card->host,
1920                                       &mq->mqrq_cur->mmc_active, NULL);
1921                 }
1922         }
1923
1924         return 0;
1925 }
1926
1927 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1928 {
1929         int ret;
1930         struct mmc_blk_data *md = mq->data;
1931         struct mmc_card *card = md->queue.card;
1932         struct mmc_host *host = card->host;
1933         unsigned long flags;
1934         unsigned int cmd_flags = req ? req->cmd_flags : 0;
1935
1936         if (req && !mq->mqrq_prev->req)
1937                 /* claim host only for the first request */
1938                 mmc_claim_host(card->host);
1939
1940         ret = mmc_blk_part_switch(card, md);
1941         if (ret) {
1942                 if (req) {
1943                         blk_end_request_all(req, -EIO);
1944                 }
1945                 ret = 0;
1946                 goto out;
1947         }
1948
1949         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
1950         if (cmd_flags & REQ_DISCARD) {
1951                 /* complete ongoing async transfer before issuing discard */
1952                 if (card->host->areq)
1953                         mmc_blk_issue_rw_rq(mq, NULL);
1954                 if (req->cmd_flags & REQ_SECURE &&
1955                         !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
1956                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
1957                 else
1958                         ret = mmc_blk_issue_discard_rq(mq, req);
1959         } else if (cmd_flags & REQ_FLUSH) {
1960                 /* complete ongoing async transfer before issuing flush */
1961                 if (card->host->areq)
1962                         mmc_blk_issue_rw_rq(mq, NULL);
1963                 ret = mmc_blk_issue_flush(mq, req);
1964         } else {
1965                 if (!req && host->areq) {
1966                         spin_lock_irqsave(&host->context_info.lock, flags);
1967                         host->context_info.is_waiting_last_req = true;
1968                         spin_unlock_irqrestore(&host->context_info.lock, flags);
1969                 }
1970                 ret = mmc_blk_issue_rw_rq(mq, req);
1971         }
1972
1973 out:
1974         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
1975              (cmd_flags & MMC_REQ_SPECIAL_MASK))
1976                 /*
1977                  * Release host when there are no more requests
1978                  * and after special request(discard, flush) is done.
1979                  * In case sepecial request, there is no reentry to
1980                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
1981                  */
1982                 mmc_release_host(card->host);
1983         return ret;
1984 }
1985
1986 static inline int mmc_blk_readonly(struct mmc_card *card)
1987 {
1988         return mmc_card_readonly(card) ||
1989                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
1990 }
1991
1992 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
1993                                               struct device *parent,
1994                                               sector_t size,
1995                                               bool default_ro,
1996                                               const char *subname,
1997                                               int area_type)
1998 {
1999         struct mmc_blk_data *md;
2000         int devidx, ret;
2001
2002         devidx = find_first_zero_bit(dev_use, max_devices);
2003         if (devidx >= max_devices)
2004                 return ERR_PTR(-ENOSPC);
2005         __set_bit(devidx, dev_use);
2006
2007         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2008         if (!md) {
2009                 ret = -ENOMEM;
2010                 goto out;
2011         }
2012
2013         /*
2014          * !subname implies we are creating main mmc_blk_data that will be
2015          * associated with mmc_card with mmc_set_drvdata. Due to device
2016          * partitions, devidx will not coincide with a per-physical card
2017          * index anymore so we keep track of a name index.
2018          */
2019         if (!subname) {
2020                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2021                 __set_bit(md->name_idx, name_use);
2022         } else
2023                 md->name_idx = ((struct mmc_blk_data *)
2024                                 dev_to_disk(parent)->private_data)->name_idx;
2025
2026         md->area_type = area_type;
2027
2028         /*
2029          * Set the read-only status based on the supported commands
2030          * and the write protect switch.
2031          */
2032         md->read_only = mmc_blk_readonly(card);
2033
2034         md->disk = alloc_disk(perdev_minors);
2035         if (md->disk == NULL) {
2036                 ret = -ENOMEM;
2037                 goto err_kfree;
2038         }
2039
2040         spin_lock_init(&md->lock);
2041         INIT_LIST_HEAD(&md->part);
2042         md->usage = 1;
2043
2044         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2045         if (ret)
2046                 goto err_putdisk;
2047
2048         md->queue.issue_fn = mmc_blk_issue_rq;
2049         md->queue.data = md;
2050
2051         md->disk->major = MMC_BLOCK_MAJOR;
2052         md->disk->first_minor = devidx * perdev_minors;
2053         md->disk->fops = &mmc_bdops;
2054         md->disk->private_data = md;
2055         md->disk->queue = md->queue.queue;
2056         md->disk->driverfs_dev = parent;
2057         set_disk_ro(md->disk, md->read_only || default_ro);
2058         if (area_type & MMC_BLK_DATA_AREA_RPMB)
2059                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2060
2061         /*
2062          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2063          *
2064          * - be set for removable media with permanent block devices
2065          * - be unset for removable block devices with permanent media
2066          *
2067          * Since MMC block devices clearly fall under the second
2068          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2069          * should use the block device creation/destruction hotplug
2070          * messages to tell when the card is present.
2071          */
2072
2073         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2074                  "mmcblk%d%s", md->name_idx, subname ? subname : "");
2075
2076         if (mmc_card_mmc(card))
2077                 blk_queue_logical_block_size(md->queue.queue,
2078                                              card->ext_csd.data_sector_size);
2079         else
2080                 blk_queue_logical_block_size(md->queue.queue, 512);
2081
2082         set_capacity(md->disk, size);
2083
2084         if (mmc_host_cmd23(card->host)) {
2085                 if (mmc_card_mmc(card) ||
2086                     (mmc_card_sd(card) &&
2087                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2088                         md->flags |= MMC_BLK_CMD23;
2089         }
2090
2091         if (mmc_card_mmc(card) &&
2092             md->flags & MMC_BLK_CMD23 &&
2093             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2094              card->ext_csd.rel_sectors)) {
2095                 md->flags |= MMC_BLK_REL_WR;
2096                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2097         }
2098
2099         if (mmc_card_mmc(card) &&
2100             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2101             (md->flags & MMC_BLK_CMD23) &&
2102             card->ext_csd.packed_event_en) {
2103                 if (!mmc_packed_init(&md->queue, card))
2104                         md->flags |= MMC_BLK_PACKED_CMD;
2105         }
2106
2107         return md;
2108
2109  err_putdisk:
2110         put_disk(md->disk);
2111  err_kfree:
2112         kfree(md);
2113  out:
2114         return ERR_PTR(ret);
2115 }
2116
2117 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2118 {
2119         sector_t size;
2120         struct mmc_blk_data *md;
2121
2122         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2123                 /*
2124                  * The EXT_CSD sector count is in number or 512 byte
2125                  * sectors.
2126                  */
2127                 size = card->ext_csd.sectors;
2128         } else {
2129                 /*
2130                  * The CSD capacity field is in units of read_blkbits.
2131                  * set_capacity takes units of 512 bytes.
2132                  */
2133                 size = card->csd.capacity << (card->csd.read_blkbits - 9);
2134         }
2135
2136         md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2137                                         MMC_BLK_DATA_AREA_MAIN);
2138         return md;
2139 }
2140
2141 static int mmc_blk_alloc_part(struct mmc_card *card,
2142                               struct mmc_blk_data *md,
2143                               unsigned int part_type,
2144                               sector_t size,
2145                               bool default_ro,
2146                               const char *subname,
2147                               int area_type)
2148 {
2149         char cap_str[10];
2150         struct mmc_blk_data *part_md;
2151
2152         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2153                                     subname, area_type);
2154         if (IS_ERR(part_md))
2155                 return PTR_ERR(part_md);
2156         part_md->part_type = part_type;
2157         list_add(&part_md->part, &md->part);
2158
2159         string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
2160                         cap_str, sizeof(cap_str));
2161         pr_info("%s: %s %s partition %u %s\n",
2162                part_md->disk->disk_name, mmc_card_id(card),
2163                mmc_card_name(card), part_md->part_type, cap_str);
2164         return 0;
2165 }
2166
2167 /* MMC Physical partitions consist of two boot partitions and
2168  * up to four general purpose partitions.
2169  * For each partition enabled in EXT_CSD a block device will be allocatedi
2170  * to provide access to the partition.
2171  */
2172
2173 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2174 {
2175         int idx, ret = 0;
2176
2177         if (!mmc_card_mmc(card))
2178                 return 0;
2179
2180         for (idx = 0; idx < card->nr_parts; idx++) {
2181                 if (card->part[idx].size) {
2182                         ret = mmc_blk_alloc_part(card, md,
2183                                 card->part[idx].part_cfg,
2184                                 card->part[idx].size >> 9,
2185                                 card->part[idx].force_ro,
2186                                 card->part[idx].name,
2187                                 card->part[idx].area_type);
2188                         if (ret)
2189                                 return ret;
2190                 }
2191         }
2192
2193         return ret;
2194 }
2195
2196 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2197 {
2198         struct mmc_card *card;
2199
2200         if (md) {
2201                 card = md->queue.card;
2202                 if (md->disk->flags & GENHD_FL_UP) {
2203                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2204                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2205                                         card->ext_csd.boot_ro_lockable)
2206                                 device_remove_file(disk_to_dev(md->disk),
2207                                         &md->power_ro_lock);
2208
2209                         /* Stop new requests from getting into the queue */
2210                         del_gendisk(md->disk);
2211                 }
2212
2213                 /* Then flush out any already in there */
2214                 mmc_cleanup_queue(&md->queue);
2215                 if (md->flags & MMC_BLK_PACKED_CMD)
2216                         mmc_packed_clean(&md->queue);
2217                 mmc_blk_put(md);
2218         }
2219 }
2220
2221 static void mmc_blk_remove_parts(struct mmc_card *card,
2222                                  struct mmc_blk_data *md)
2223 {
2224         struct list_head *pos, *q;
2225         struct mmc_blk_data *part_md;
2226
2227         __clear_bit(md->name_idx, name_use);
2228         list_for_each_safe(pos, q, &md->part) {
2229                 part_md = list_entry(pos, struct mmc_blk_data, part);
2230                 list_del(pos);
2231                 mmc_blk_remove_req(part_md);
2232         }
2233 }
2234
2235 static int mmc_add_disk(struct mmc_blk_data *md)
2236 {
2237         int ret;
2238         struct mmc_card *card = md->queue.card;
2239
2240         add_disk(md->disk);
2241         md->force_ro.show = force_ro_show;
2242         md->force_ro.store = force_ro_store;
2243         sysfs_attr_init(&md->force_ro.attr);
2244         md->force_ro.attr.name = "force_ro";
2245         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2246         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2247         if (ret)
2248                 goto force_ro_fail;
2249
2250         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2251              card->ext_csd.boot_ro_lockable) {
2252                 umode_t mode;
2253
2254                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2255                         mode = S_IRUGO;
2256                 else
2257                         mode = S_IRUGO | S_IWUSR;
2258
2259                 md->power_ro_lock.show = power_ro_lock_show;
2260                 md->power_ro_lock.store = power_ro_lock_store;
2261                 sysfs_attr_init(&md->power_ro_lock.attr);
2262                 md->power_ro_lock.attr.mode = mode;
2263                 md->power_ro_lock.attr.name =
2264                                         "ro_lock_until_next_power_on";
2265                 ret = device_create_file(disk_to_dev(md->disk),
2266                                 &md->power_ro_lock);
2267                 if (ret)
2268                         goto power_ro_lock_fail;
2269         }
2270         return ret;
2271
2272 power_ro_lock_fail:
2273         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2274 force_ro_fail:
2275         del_gendisk(md->disk);
2276
2277         return ret;
2278 }
2279
2280 #define CID_MANFID_SANDISK      0x2
2281 #define CID_MANFID_TOSHIBA      0x11
2282 #define CID_MANFID_MICRON       0x13
2283 #define CID_MANFID_SAMSUNG      0x15
2284
2285 static const struct mmc_fixup blk_fixups[] =
2286 {
2287         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2288                   MMC_QUIRK_INAND_CMD38),
2289         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2290                   MMC_QUIRK_INAND_CMD38),
2291         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2292                   MMC_QUIRK_INAND_CMD38),
2293         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2294                   MMC_QUIRK_INAND_CMD38),
2295         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2296                   MMC_QUIRK_INAND_CMD38),
2297
2298         /*
2299          * Some MMC cards experience performance degradation with CMD23
2300          * instead of CMD12-bounded multiblock transfers. For now we'll
2301          * black list what's bad...
2302          * - Certain Toshiba cards.
2303          *
2304          * N.B. This doesn't affect SD cards.
2305          */
2306         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2307                   MMC_QUIRK_BLK_NO_CMD23),
2308         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2309                   MMC_QUIRK_BLK_NO_CMD23),
2310         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2311                   MMC_QUIRK_BLK_NO_CMD23),
2312
2313         /*
2314          * Some Micron MMC cards needs longer data read timeout than
2315          * indicated in CSD.
2316          */
2317         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2318                   MMC_QUIRK_LONG_READ_TIME),
2319
2320         /*
2321          * On these Samsung MoviNAND parts, performing secure erase or
2322          * secure trim can result in unrecoverable corruption due to a
2323          * firmware bug.
2324          */
2325         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2326                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2327         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2328                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2329         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2330                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2331         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2332                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2333         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2334                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2335         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2336                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2337         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2338                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2339         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2340                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2341
2342         END_FIXUP
2343 };
2344
2345 static int mmc_blk_probe(struct mmc_card *card)
2346 {
2347         struct mmc_blk_data *md, *part_md;
2348         char cap_str[10];
2349
2350         /*
2351          * Check that the card supports the command class(es) we need.
2352          */
2353         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2354                 return -ENODEV;
2355
2356         md = mmc_blk_alloc(card);
2357         if (IS_ERR(md))
2358                 return PTR_ERR(md);
2359
2360         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
2361                         cap_str, sizeof(cap_str));
2362         pr_info("%s: %s %s %s %s\n",
2363                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2364                 cap_str, md->read_only ? "(ro)" : "");
2365
2366         if (mmc_blk_alloc_parts(card, md))
2367                 goto out;
2368
2369         mmc_set_drvdata(card, md);
2370         mmc_fixup_device(card, blk_fixups);
2371
2372         if (mmc_add_disk(md))
2373                 goto out;
2374
2375         list_for_each_entry(part_md, &md->part, part) {
2376                 if (mmc_add_disk(part_md))
2377                         goto out;
2378         }
2379         return 0;
2380
2381  out:
2382         mmc_blk_remove_parts(card, md);
2383         mmc_blk_remove_req(md);
2384         return 0;
2385 }
2386
2387 static void mmc_blk_remove(struct mmc_card *card)
2388 {
2389         struct mmc_blk_data *md = mmc_get_drvdata(card);
2390
2391         mmc_blk_remove_parts(card, md);
2392         mmc_claim_host(card->host);
2393         mmc_blk_part_switch(card, md);
2394         mmc_release_host(card->host);
2395         mmc_blk_remove_req(md);
2396         mmc_set_drvdata(card, NULL);
2397 }
2398
2399 #ifdef CONFIG_PM
2400 static int mmc_blk_suspend(struct mmc_card *card)
2401 {
2402         struct mmc_blk_data *part_md;
2403         struct mmc_blk_data *md = mmc_get_drvdata(card);
2404
2405         if (md) {
2406                 mmc_queue_suspend(&md->queue);
2407                 list_for_each_entry(part_md, &md->part, part) {
2408                         mmc_queue_suspend(&part_md->queue);
2409                 }
2410         }
2411         return 0;
2412 }
2413
2414 static int mmc_blk_resume(struct mmc_card *card)
2415 {
2416         struct mmc_blk_data *part_md;
2417         struct mmc_blk_data *md = mmc_get_drvdata(card);
2418
2419         if (md) {
2420                 /*
2421                  * Resume involves the card going into idle state,
2422                  * so current partition is always the main one.
2423                  */
2424                 md->part_curr = md->part_type;
2425                 mmc_queue_resume(&md->queue);
2426                 list_for_each_entry(part_md, &md->part, part) {
2427                         mmc_queue_resume(&part_md->queue);
2428                 }
2429         }
2430         return 0;
2431 }
2432 #else
2433 #define mmc_blk_suspend NULL
2434 #define mmc_blk_resume  NULL
2435 #endif
2436
2437 static struct mmc_driver mmc_driver = {
2438         .drv            = {
2439                 .name   = "mmcblk",
2440         },
2441         .probe          = mmc_blk_probe,
2442         .remove         = mmc_blk_remove,
2443         .suspend        = mmc_blk_suspend,
2444         .resume         = mmc_blk_resume,
2445 };
2446
2447 static int __init mmc_blk_init(void)
2448 {
2449         int res;
2450
2451         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2452                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2453
2454         max_devices = 256 / perdev_minors;
2455
2456         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2457         if (res)
2458                 goto out;
2459
2460         res = mmc_register_driver(&mmc_driver);
2461         if (res)
2462                 goto out2;
2463
2464         return 0;
2465  out2:
2466         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2467  out:
2468         return res;
2469 }
2470
2471 static void __exit mmc_blk_exit(void)
2472 {
2473         mmc_unregister_driver(&mmc_driver);
2474         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2475 }
2476
2477 module_init(mmc_blk_init);
2478 module_exit(mmc_blk_exit);
2479
2480 MODULE_LICENSE("GPL");
2481 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2482