drivers/mmc/card/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/mutex.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/string_helpers.h>
  34 #include <linux/delay.h>
  35 #include <linux/capability.h>
  36 #include <linux/compat.h>
  37 #include <linux/pm_runtime.h>
  38
  39 #include <linux/mmc/ioctl.h>
  40 #include <linux/mmc/card.h>
  41 #include <linux/mmc/host.h>
  42 #include <linux/mmc/mmc.h>
  43 #include <linux/mmc/sd.h>
  44
  45 #include <asm/uaccess.h>
  46
  47 #include "queue.h"
  48
  49 MODULE_ALIAS("mmc:block");
  50 #ifdef MODULE_PARAM_PREFIX
  51 #undef MODULE_PARAM_PREFIX
  52 #endif
  53 #define MODULE_PARAM_PREFIX "mmcblk."
  54
  55 #define INAND_CMD38_ARG_EXT_CSD  113
  56 #define INAND_CMD38_ARG_ERASE    0x00
  57 #define INAND_CMD38_ARG_TRIM     0x01
  58 #define INAND_CMD38_ARG_SECERASE 0x80
  59 #define INAND_CMD38_ARG_SECTRIM1 0x81
  60 #define INAND_CMD38_ARG_SECTRIM2 0x88
  61 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  62 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  63 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  64
  65 #define mmc_req_rel_wr(req)     ((req->cmd_flags & REQ_FUA) && \
  66                                   (rq_data_dir(req) == WRITE))
  67 #define PACKED_CMD_VER  0x01
  68 #define PACKED_CMD_WR   0x02
  69
  70 static DEFINE_MUTEX(block_mutex);
  71
  72 /*
  73  * The defaults come from config options but can be overriden by module
  74  * or bootarg options.
  75  */
  76 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  77
  78 /*
  79  * We've only got one major, so number of mmcblk devices is
  80  * limited to (1 << 20) / number of minors per device.  It is also
  81  * currently limited by the size of the static bitmaps below.
  82  */
  83 static int max_devices;
  84
  85 #define MAX_DEVICES 256
  86
  87 /* TODO: Replace these with struct ida */
  88 static DECLARE_BITMAP(dev_use, MAX_DEVICES);
  89 static DECLARE_BITMAP(name_use, MAX_DEVICES);
  90
  91 /*
  92  * There is one mmc_blk_data per slot.
  93  */
  94 struct mmc_blk_data {
  95         spinlock_t      lock;
  96         struct gendisk  *disk;
  97         struct mmc_queue queue;
  98         struct list_head part;
  99
 100         unsigned int    flags;
 101 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
 102 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
 103 #define MMC_BLK_PACKED_CMD      (1 << 2)        /* MMC packed command support */
 104
 105         unsigned int    usage;
 106         unsigned int    read_only;
 107         unsigned int    part_type;
 108         unsigned int    name_idx;
 109         unsigned int    reset_done;
 110 #define MMC_BLK_READ            BIT(0)
 111 #define MMC_BLK_WRITE           BIT(1)
 112 #define MMC_BLK_DISCARD         BIT(2)
 113 #define MMC_BLK_SECDISCARD      BIT(3)
 114
 115         /*
 116          * Only set in main mmc_blk_data associated
 117          * with mmc_card with dev_set_drvdata, and keeps
 118          * track of the current selected device partition.
 119          */
 120         unsigned int    part_curr;
 121         struct device_attribute force_ro;
 122         struct device_attribute power_ro_lock;
 123         int     area_type;
 124 };
 125
 126 static DEFINE_MUTEX(open_lock);
 127
 128 enum {
 129         MMC_PACKED_NR_IDX = -1,
 130         MMC_PACKED_NR_ZERO,
 131         MMC_PACKED_NR_SINGLE,
 132 };
 133
 134 module_param(perdev_minors, int, 0444);
 135 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 136
 137 static inline int mmc_blk_part_switch(struct mmc_card *card,
 138                                       struct mmc_blk_data *md);
 139 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 140
 141 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 142 {
 143         struct mmc_packed *packed = mqrq->packed;
 144
 145         BUG_ON(!packed);
 146
 147         mqrq->cmd_type = MMC_PACKED_NONE;
 148         packed->nr_entries = MMC_PACKED_NR_ZERO;
 149         packed->idx_failure = MMC_PACKED_NR_IDX;
 150         packed->retries = 0;
 151         packed->blocks = 0;
 152 }
 153
 154 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 155 {
 156         struct mmc_blk_data *md;
 157
 158         mutex_lock(&open_lock);
 159         md = disk->private_data;
 160         if (md && md->usage == 0)
 161                 md = NULL;
 162         if (md)
 163                 md->usage++;
 164         mutex_unlock(&open_lock);
 165
 166         return md;
 167 }
 168
 169 static inline int mmc_get_devidx(struct gendisk *disk)
 170 {
 171         int devidx = disk->first_minor / perdev_minors;
 172         return devidx;
 173 }
 174
 175 static void mmc_blk_put(struct mmc_blk_data *md)
 176 {
 177         mutex_lock(&open_lock);
 178         md->usage--;
 179         if (md->usage == 0) {
 180                 int devidx = mmc_get_devidx(md->disk);
 181                 blk_cleanup_queue(md->queue.queue);
 182
 183                 __clear_bit(devidx, dev_use);
 184
 185                 put_disk(md->disk);
 186                 kfree(md);
 187         }
 188         mutex_unlock(&open_lock);
 189 }
 190
 191 static ssize_t power_ro_lock_show(struct device *dev,
 192                 struct device_attribute *attr, char *buf)
 193 {
 194         int ret;
 195         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 196         struct mmc_card *card = md->queue.card;
 197         int locked = 0;
 198
 199         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 200                 locked = 2;
 201         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 202                 locked = 1;
 203
 204         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 205
 206         mmc_blk_put(md);
 207
 208         return ret;
 209 }
 210
 211 static ssize_t power_ro_lock_store(struct device *dev,
 212                 struct device_attribute *attr, const char *buf, size_t count)
 213 {
 214         int ret;
 215         struct mmc_blk_data *md, *part_md;
 216         struct mmc_card *card;
 217         unsigned long set;
 218
 219         if (kstrtoul(buf, 0, &set))
 220                 return -EINVAL;
 221
 222         if (set != 1)
 223                 return count;
 224
 225         md = mmc_blk_get(dev_to_disk(dev));
 226         card = md->queue.card;
 227
 228         mmc_get_card(card);
 229
 230         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 231                                 card->ext_csd.boot_ro_lock |
 232                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 233                                 card->ext_csd.part_time);
 234         if (ret)
 235                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 236         else
 237                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 238
 239         mmc_put_card(card);
 240
 241         if (!ret) {
 242                 pr_info("%s: Locking boot partition ro until next power on\n",
 243                         md->disk->disk_name);
 244                 set_disk_ro(md->disk, 1);
 245
 246                 list_for_each_entry(part_md, &md->part, part)
 247                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 248                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 249                                 set_disk_ro(part_md->disk, 1);
 250                         }
 251         }
 252
 253         mmc_blk_put(md);
 254         return count;
 255 }
 256
 257 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 258                              char *buf)
 259 {
 260         int ret;
 261         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 262
 263         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 264                        get_disk_ro(dev_to_disk(dev)) ^
 265                        md->read_only);
 266         mmc_blk_put(md);
 267         return ret;
 268 }
 269
 270 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 271                               const char *buf, size_t count)
 272 {
 273         int ret;
 274         char *end;
 275         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 276         unsigned long set = simple_strtoul(buf, &end, 0);
 277         if (end == buf) {
 278                 ret = -EINVAL;
 279                 goto out;
 280         }
 281
 282         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 283         ret = count;
 284 out:
 285         mmc_blk_put(md);
 286         return ret;
 287 }
 288
 289 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 290 {
 291         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 292         int ret = -ENXIO;
 293
 294         mutex_lock(&block_mutex);
 295         if (md) {
 296                 if (md->usage == 2)
 297                         check_disk_change(bdev);
 298                 ret = 0;
 299
 300                 if ((mode & FMODE_WRITE) && md->read_only) {
 301                         mmc_blk_put(md);
 302                         ret = -EROFS;
 303                 }
 304         }
 305         mutex_unlock(&block_mutex);
 306
 307         return ret;
 308 }
 309
 310 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 311 {
 312         struct mmc_blk_data *md = disk->private_data;
 313
 314         mutex_lock(&block_mutex);
 315         mmc_blk_put(md);
 316         mutex_unlock(&block_mutex);
 317 }
 318
 319 static int
 320 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 321 {
 322         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 323         geo->heads = 4;
 324         geo->sectors = 16;
 325         return 0;
 326 }
 327
 328 struct mmc_blk_ioc_data {
 329         struct mmc_ioc_cmd ic;
 330         unsigned char *buf;
 331         u64 buf_bytes;
 332 };
 333
 334 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 335         struct mmc_ioc_cmd __user *user)
 336 {
 337         struct mmc_blk_ioc_data *idata;
 338         int err;
 339
 340         idata = kmalloc(sizeof(*idata), GFP_KERNEL);
 341         if (!idata) {
 342                 err = -ENOMEM;
 343                 goto out;
 344         }
 345
 346         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 347                 err = -EFAULT;
 348                 goto idata_err;
 349         }
 350
 351         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 352         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 353                 err = -EOVERFLOW;
 354                 goto idata_err;
 355         }
 356
 357         if (!idata->buf_bytes)
 358                 return idata;
 359
 360         idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
 361         if (!idata->buf) {
 362                 err = -ENOMEM;
 363                 goto idata_err;
 364         }
 365
 366         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 367                                         idata->ic.data_ptr, idata->buf_bytes)) {
 368                 err = -EFAULT;
 369                 goto copy_err;
 370         }
 371
 372         return idata;
 373
 374 copy_err:
 375         kfree(idata->buf);
 376 idata_err:
 377         kfree(idata);
 378 out:
 379         return ERR_PTR(err);
 380 }
 381
 382 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
 383                                       struct mmc_blk_ioc_data *idata)
 384 {
 385         struct mmc_ioc_cmd *ic = &idata->ic;
 386
 387         if (copy_to_user(&(ic_ptr->response), ic->response,
 388                          sizeof(ic->response)))
 389                 return -EFAULT;
 390
 391         if (!idata->ic.write_flag) {
 392                 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
 393                                  idata->buf, idata->buf_bytes))
 394                         return -EFAULT;
 395         }
 396
 397         return 0;
 398 }
 399
 400 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 401                                        u32 retries_max)
 402 {
 403         int err;
 404         u32 retry_count = 0;
 405
 406         if (!status || !retries_max)
 407                 return -EINVAL;
 408
 409         do {
 410                 err = get_card_status(card, status, 5);
 411                 if (err)
 412                         break;
 413
 414                 if (!R1_STATUS(*status) &&
 415                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 416                         break; /* RPMB programming operation complete */
 417
 418                 /*
 419                  * Rechedule to give the MMC device a chance to continue
 420                  * processing the previous command without being polled too
 421                  * frequently.
 422                  */
 423                 usleep_range(1000, 5000);
 424         } while (++retry_count < retries_max);
 425
 426         if (retry_count == retries_max)
 427                 err = -EPERM;
 428
 429         return err;
 430 }
 431
 432 static int ioctl_do_sanitize(struct mmc_card *card)
 433 {
 434         int err;
 435
 436         if (!mmc_can_sanitize(card)) {
 437                         pr_warn("%s: %s - SANITIZE is not supported\n",
 438                                 mmc_hostname(card->host), __func__);
 439                         err = -EOPNOTSUPP;
 440                         goto out;
 441         }
 442
 443         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 444                 mmc_hostname(card->host), __func__);
 445
 446         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 447                                         EXT_CSD_SANITIZE_START, 1,
 448                                         MMC_SANITIZE_REQ_TIMEOUT);
 449
 450         if (err)
 451                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 452                        mmc_hostname(card->host), __func__, err);
 453
 454         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 455                                              __func__);
 456 out:
 457         return err;
 458 }
 459
 460 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 461                                struct mmc_blk_ioc_data *idata)
 462 {
 463         struct mmc_command cmd = {0};
 464         struct mmc_data data = {0};
 465         struct mmc_request mrq = {NULL};
 466         struct scatterlist sg;
 467         int err;
 468         int is_rpmb = false;
 469         u32 status = 0;
 470
 471         if (!card || !md || !idata)
 472                 return -EINVAL;
 473
 474         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 475                 is_rpmb = true;
 476
 477         cmd.opcode = idata->ic.opcode;
 478         cmd.arg = idata->ic.arg;
 479         cmd.flags = idata->ic.flags;
 480
 481         if (idata->buf_bytes) {
 482                 data.sg = &sg;
 483                 data.sg_len = 1;
 484                 data.blksz = idata->ic.blksz;
 485                 data.blocks = idata->ic.blocks;
 486
 487                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 488
 489                 if (idata->ic.write_flag)
 490                         data.flags = MMC_DATA_WRITE;
 491                 else
 492                         data.flags = MMC_DATA_READ;
 493
 494                 /* data.flags must already be set before doing this. */
 495                 mmc_set_data_timeout(&data, card);
 496
 497                 /* Allow overriding the timeout_ns for empirical tuning. */
 498                 if (idata->ic.data_timeout_ns)
 499                         data.timeout_ns = idata->ic.data_timeout_ns;
 500
 501                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 502                         /*
 503                          * Pretend this is a data transfer and rely on the
 504                          * host driver to compute timeout.  When all host
 505                          * drivers support cmd.cmd_timeout for R1B, this
 506                          * can be changed to:
 507                          *
 508                          *     mrq.data = NULL;
 509                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 510                          */
 511                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 512                 }
 513
 514                 mrq.data = &data;
 515         }
 516
 517         mrq.cmd = &cmd;
 518
 519         err = mmc_blk_part_switch(card, md);
 520         if (err)
 521                 return err;
 522
 523         if (idata->ic.is_acmd) {
 524                 err = mmc_app_cmd(card->host, card);
 525                 if (err)
 526                         return err;
 527         }
 528
 529         if (is_rpmb) {
 530                 err = mmc_set_blockcount(card, data.blocks,
 531                         idata->ic.write_flag & (1 << 31));
 532                 if (err)
 533                         return err;
 534         }
 535
 536         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 537             (cmd.opcode == MMC_SWITCH)) {
 538                 err = ioctl_do_sanitize(card);
 539
 540                 if (err)
 541                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 542                                __func__, err);
 543
 544                 return err;
 545         }
 546
 547         mmc_wait_for_req(card->host, &mrq);
 548
 549         if (cmd.error) {
 550                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 551                                                 __func__, cmd.error);
 552                 return cmd.error;
 553         }
 554         if (data.error) {
 555                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 556                                                 __func__, data.error);
 557                 return data.error;
 558         }
 559
 560         /*
 561          * According to the SD specs, some commands require a delay after
 562          * issuing the command.
 563          */
 564         if (idata->ic.postsleep_min_us)
 565                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 566
 567         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
 568
 569         if (is_rpmb) {
 570                 /*
 571                  * Ensure RPMB command has completed by polling CMD13
 572                  * "Send Status".
 573                  */
 574                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 575                 if (err)
 576                         dev_err(mmc_dev(card->host),
 577                                         "%s: Card Status=0x%08X, error %d\n",
 578                                         __func__, status, err);
 579         }
 580
 581         return err;
 582 }
 583
 584 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 585                              struct mmc_ioc_cmd __user *ic_ptr)
 586 {
 587         struct mmc_blk_ioc_data *idata;
 588         struct mmc_blk_data *md;
 589         struct mmc_card *card;
 590         int err = 0, ioc_err = 0;
 591
 592         /*
 593          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 594          * whole block device, not on a partition.  This prevents overspray
 595          * between sibling partitions.
 596          */
 597         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 598                 return -EPERM;
 599
 600         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 601         if (IS_ERR(idata))
 602                 return PTR_ERR(idata);
 603
 604         md = mmc_blk_get(bdev->bd_disk);
 605         if (!md) {
 606                 err = -EINVAL;
 607                 goto cmd_err;
 608         }
 609
 610         card = md->queue.card;
 611         if (IS_ERR(card)) {
 612                 err = PTR_ERR(card);
 613                 goto cmd_done;
 614         }
 615
 616         mmc_get_card(card);
 617
 618         ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
 619
 620         mmc_put_card(card);
 621
 622         err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
 623
 624 cmd_done:
 625         mmc_blk_put(md);
 626 cmd_err:
 627         kfree(idata->buf);
 628         kfree(idata);
 629         return ioc_err ? ioc_err : err;
 630 }
 631
 632 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 633                                    struct mmc_ioc_multi_cmd __user *user)
 634 {
 635         struct mmc_blk_ioc_data **idata = NULL;
 636         struct mmc_ioc_cmd __user *cmds = user->cmds;
 637         struct mmc_card *card;
 638         struct mmc_blk_data *md;
 639         int i, err = 0, ioc_err = 0;
 640         __u64 num_of_cmds;
 641
 642         /*
 643          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 644          * whole block device, not on a partition.  This prevents overspray
 645          * between sibling partitions.
 646          */
 647         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 648                 return -EPERM;
 649
 650         if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
 651                            sizeof(num_of_cmds)))
 652                 return -EFAULT;
 653
 654         if (num_of_cmds > MMC_IOC_MAX_CMDS)
 655                 return -EINVAL;
 656
 657         idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
 658         if (!idata)
 659                 return -ENOMEM;
 660
 661         for (i = 0; i < num_of_cmds; i++) {
 662                 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
 663                 if (IS_ERR(idata[i])) {
 664                         err = PTR_ERR(idata[i]);
 665                         num_of_cmds = i;
 666                         goto cmd_err;
 667                 }
 668         }
 669
 670         md = mmc_blk_get(bdev->bd_disk);
 671         if (!md) {
 672                 err = -EINVAL;
 673                 goto cmd_err;
 674         }
 675
 676         card = md->queue.card;
 677         if (IS_ERR(card)) {
 678                 err = PTR_ERR(card);
 679                 goto cmd_done;
 680         }
 681
 682         mmc_get_card(card);
 683
 684         for (i = 0; i < num_of_cmds && !ioc_err; i++)
 685                 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 686
 687         mmc_put_card(card);
 688
 689         /* copy to user if data and response */
 690         for (i = 0; i < num_of_cmds && !err; i++)
 691                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 692
 693 cmd_done:
 694         mmc_blk_put(md);
 695 cmd_err:
 696         for (i = 0; i < num_of_cmds; i++) {
 697                 kfree(idata[i]->buf);
 698                 kfree(idata[i]);
 699         }
 700         kfree(idata);
 701         return ioc_err ? ioc_err : err;
 702 }
 703
 704 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 705         unsigned int cmd, unsigned long arg)
 706 {
 707         switch (cmd) {
 708         case MMC_IOC_CMD:
 709                 return mmc_blk_ioctl_cmd(bdev,
 710                                 (struct mmc_ioc_cmd __user *)arg);
 711         case MMC_IOC_MULTI_CMD:
 712                 return mmc_blk_ioctl_multi_cmd(bdev,
 713                                 (struct mmc_ioc_multi_cmd __user *)arg);
 714         default:
 715                 return -EINVAL;
 716         }
 717 }
 718
 719 #ifdef CONFIG_COMPAT
 720 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 721         unsigned int cmd, unsigned long arg)
 722 {
 723         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 724 }
 725 #endif
 726
 727 static const struct block_device_operations mmc_bdops = {
 728         .open                   = mmc_blk_open,
 729         .release                = mmc_blk_release,
 730         .getgeo                 = mmc_blk_getgeo,
 731         .owner                  = THIS_MODULE,
 732         .ioctl                  = mmc_blk_ioctl,
 733 #ifdef CONFIG_COMPAT
 734         .compat_ioctl           = mmc_blk_compat_ioctl,
 735 #endif
 736 };
 737
 738 static inline int mmc_blk_part_switch(struct mmc_card *card,
 739                                       struct mmc_blk_data *md)
 740 {
 741         int ret;
 742         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 743
 744         if (main_md->part_curr == md->part_type)
 745                 return 0;
 746
 747         if (mmc_card_mmc(card)) {
 748                 u8 part_config = card->ext_csd.part_config;
 749
 750                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 751                 part_config |= md->part_type;
 752
 753                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 754                                  EXT_CSD_PART_CONFIG, part_config,
 755                                  card->ext_csd.part_time);
 756                 if (ret)
 757                         return ret;
 758
 759                 card->ext_csd.part_config = part_config;
 760         }
 761
 762         main_md->part_curr = md->part_type;
 763         return 0;
 764 }
 765
 766 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 767 {
 768         int err;
 769         u32 result;
 770         __be32 *blocks;
 771
 772         struct mmc_request mrq = {NULL};
 773         struct mmc_command cmd = {0};
 774         struct mmc_data data = {0};
 775
 776         struct scatterlist sg;
 777
 778         cmd.opcode = MMC_APP_CMD;
 779         cmd.arg = card->rca << 16;
 780         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 781
 782         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 783         if (err)
 784                 return (u32)-1;
 785         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 786                 return (u32)-1;
 787
 788         memset(&cmd, 0, sizeof(struct mmc_command));
 789
 790         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 791         cmd.arg = 0;
 792         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 793
 794         data.blksz = 4;
 795         data.blocks = 1;
 796         data.flags = MMC_DATA_READ;
 797         data.sg = &sg;
 798         data.sg_len = 1;
 799         mmc_set_data_timeout(&data, card);
 800
 801         mrq.cmd = &cmd;
 802         mrq.data = &data;
 803
 804         blocks = kmalloc(4, GFP_KERNEL);
 805         if (!blocks)
 806                 return (u32)-1;
 807
 808         sg_init_one(&sg, blocks, 4);
 809
 810         mmc_wait_for_req(card->host, &mrq);
 811
 812         result = ntohl(*blocks);
 813         kfree(blocks);
 814
 815         if (cmd.error || data.error)
 816                 result = (u32)-1;
 817
 818         return result;
 819 }
 820
 821 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 822 {
 823         struct mmc_command cmd = {0};
 824         int err;
 825
 826         cmd.opcode = MMC_SEND_STATUS;
 827         if (!mmc_host_is_spi(card->host))
 828                 cmd.arg = card->rca << 16;
 829         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 830         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 831         if (err == 0)
 832                 *status = cmd.resp[0];
 833         return err;
 834 }
 835
 836 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 837                 bool hw_busy_detect, struct request *req, int *gen_err)
 838 {
 839         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 840         int err = 0;
 841         u32 status;
 842
 843         do {
 844                 err = get_card_status(card, &status, 5);
 845                 if (err) {
 846                         pr_err("%s: error %d requesting status\n",
 847                                req->rq_disk->disk_name, err);
 848                         return err;
 849                 }
 850
 851                 if (status & R1_ERROR) {
 852                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 853                                 req->rq_disk->disk_name, __func__, status);
 854                         *gen_err = 1;
 855                 }
 856
 857                 /* We may rely on the host hw to handle busy detection.*/
 858                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 859                         hw_busy_detect)
 860                         break;
 861
 862                 /*
 863                  * Timeout if the device never becomes ready for data and never
 864                  * leaves the program state.
 865                  */
 866                 if (time_after(jiffies, timeout)) {
 867                         pr_err("%s: Card stuck in programming state! %s %s\n",
 868                                 mmc_hostname(card->host),
 869                                 req->rq_disk->disk_name, __func__);
 870                         return -ETIMEDOUT;
 871                 }
 872
 873                 /*
 874                  * Some cards mishandle the status bits,
 875                  * so make sure to check both the busy
 876                  * indication and the card state.
 877                  */
 878         } while (!(status & R1_READY_FOR_DATA) ||
 879                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 880
 881         return err;
 882 }
 883
 884 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 885                 struct request *req, int *gen_err, u32 *stop_status)
 886 {
 887         struct mmc_host *host = card->host;
 888         struct mmc_command cmd = {0};
 889         int err;
 890         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 891
 892         /*
 893          * Normally we use R1B responses for WRITE, but in cases where the host
 894          * has specified a max_busy_timeout we need to validate it. A failure
 895          * means we need to prevent the host from doing hw busy detection, which
 896          * is done by converting to a R1 response instead.
 897          */
 898         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 899                 use_r1b_resp = false;
 900
 901         cmd.opcode = MMC_STOP_TRANSMISSION;
 902         if (use_r1b_resp) {
 903                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 904                 cmd.busy_timeout = timeout_ms;
 905         } else {
 906                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 907         }
 908
 909         err = mmc_wait_for_cmd(host, &cmd, 5);
 910         if (err)
 911                 return err;
 912
 913         *stop_status = cmd.resp[0];
 914
 915         /* No need to check card status in case of READ. */
 916         if (rq_data_dir(req) == READ)
 917                 return 0;
 918
 919         if (!mmc_host_is_spi(host) &&
 920                 (*stop_status & R1_ERROR)) {
 921                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 922                         req->rq_disk->disk_name, __func__, *stop_status);
 923                 *gen_err = 1;
 924         }
 925
 926         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 927 }
 928
 929 #define ERR_NOMEDIUM    3
 930 #define ERR_RETRY       2
 931 #define ERR_ABORT       1
 932 #define ERR_CONTINUE    0
 933
 934 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 935         bool status_valid, u32 status)
 936 {
 937         switch (error) {
 938         case -EILSEQ:
 939                 /* response crc error, retry the r/w cmd */
 940                 pr_err("%s: %s sending %s command, card status %#x\n",
 941                         req->rq_disk->disk_name, "response CRC error",
 942                         name, status);
 943                 return ERR_RETRY;
 944
 945         case -ETIMEDOUT:
 946                 pr_err("%s: %s sending %s command, card status %#x\n",
 947                         req->rq_disk->disk_name, "timed out", name, status);
 948
 949                 /* If the status cmd initially failed, retry the r/w cmd */
 950                 if (!status_valid)
 951                         return ERR_RETRY;
 952
 953                 /*
 954                  * If it was a r/w cmd crc error, or illegal command
 955                  * (eg, issued in wrong state) then retry - we should
 956                  * have corrected the state problem above.
 957                  */
 958                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
 959                         return ERR_RETRY;
 960
 961                 /* Otherwise abort the command */
 962                 return ERR_ABORT;
 963
 964         default:
 965                 /* We don't understand the error code the driver gave us */
 966                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 967                        req->rq_disk->disk_name, error, status);
 968                 return ERR_ABORT;
 969         }
 970 }
 971
 972 /*
 973  * Initial r/w and stop cmd error recovery.
 974  * We don't know whether the card received the r/w cmd or not, so try to
 975  * restore things back to a sane state.  Essentially, we do this as follows:
 976  * - Obtain card status.  If the first attempt to obtain card status fails,
 977  *   the status word will reflect the failed status cmd, not the failed
 978  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 979  *   longer communicate with the card.
 980  * - Check the card state.  If the card received the cmd but there was a
 981  *   transient problem with the response, it might still be in a data transfer
 982  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 983  * - If the r/w cmd failed due to a response CRC error, it was probably
 984  *   transient, so retry the cmd.
 985  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 986  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 987  *   illegal cmd, retry.
 988  * Otherwise we don't understand what happened, so abort.
 989  */
 990 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 991         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 992 {
 993         bool prev_cmd_status_valid = true;
 994         u32 status, stop_status = 0;
 995         int err, retry;
 996
 997         if (mmc_card_removed(card))
 998                 return ERR_NOMEDIUM;
 999
1000         /*
1001          * Try to get card status which indicates both the card state
1002          * and why there was no response.  If the first attempt fails,
1003          * we can't be sure the returned status is for the r/w command.
1004          */
1005         for (retry = 2; retry >= 0; retry--) {
1006                 err = get_card_status(card, &status, 0);
1007                 if (!err)
1008                         break;
1009
1010                 /* Re-tune if needed */
1011                 mmc_retune_recheck(card->host);
1012
1013                 prev_cmd_status_valid = false;
1014                 pr_err("%s: error %d sending status command, %sing\n",
1015                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1016         }
1017
1018         /* We couldn't get a response from the card.  Give up. */
1019         if (err) {
1020                 /* Check if the card is removed */
1021                 if (mmc_detect_card_removed(card->host))
1022                         return ERR_NOMEDIUM;
1023                 return ERR_ABORT;
1024         }
1025
1026         /* Flag ECC errors */
1027         if ((status & R1_CARD_ECC_FAILED) ||
1028             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1029             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1030                 *ecc_err = 1;
1031
1032         /* Flag General errors */
1033         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1034                 if ((status & R1_ERROR) ||
1035                         (brq->stop.resp[0] & R1_ERROR)) {
1036                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1037                                req->rq_disk->disk_name, __func__,
1038                                brq->stop.resp[0], status);
1039                         *gen_err = 1;
1040                 }
1041
1042         /*
1043          * Check the current card state.  If it is in some data transfer
1044          * mode, tell it to stop (and hopefully transition back to TRAN.)
1045          */
1046         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1047             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1048                 err = send_stop(card,
1049                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1050                         req, gen_err, &stop_status);
1051                 if (err) {
1052                         pr_err("%s: error %d sending stop command\n",
1053                                req->rq_disk->disk_name, err);
1054                         /*
1055                          * If the stop cmd also timed out, the card is probably
1056                          * not present, so abort. Other errors are bad news too.
1057                          */
1058                         return ERR_ABORT;
1059                 }
1060
1061                 if (stop_status & R1_CARD_ECC_FAILED)
1062                         *ecc_err = 1;
1063         }
1064
1065         /* Check for set block count errors */
1066         if (brq->sbc.error)
1067                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1068                                 prev_cmd_status_valid, status);
1069
1070         /* Check for r/w command errors */
1071         if (brq->cmd.error)
1072                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1073                                 prev_cmd_status_valid, status);
1074
1075         /* Data errors */
1076         if (!brq->stop.error)
1077                 return ERR_CONTINUE;
1078
1079         /* Now for stop errors.  These aren't fatal to the transfer. */
1080         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1081                req->rq_disk->disk_name, brq->stop.error,
1082                brq->cmd.resp[0], status);
1083
1084         /*
1085          * Subsitute in our own stop status as this will give the error
1086          * state which happened during the execution of the r/w command.
1087          */
1088         if (stop_status) {
1089                 brq->stop.resp[0] = stop_status;
1090                 brq->stop.error = 0;
1091         }
1092         return ERR_CONTINUE;
1093 }
1094
1095 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1096                          int type)
1097 {
1098         int err;
1099
1100         if (md->reset_done & type)
1101                 return -EEXIST;
1102
1103         md->reset_done |= type;
1104         err = mmc_hw_reset(host);
1105         /* Ensure we switch back to the correct partition */
1106         if (err != -EOPNOTSUPP) {
1107                 struct mmc_blk_data *main_md =
1108                         dev_get_drvdata(&host->card->dev);
1109                 int part_err;
1110
1111                 main_md->part_curr = main_md->part_type;
1112                 part_err = mmc_blk_part_switch(host->card, md);
1113                 if (part_err) {
1114                         /*
1115                          * We have failed to get back into the correct
1116                          * partition, so we need to abort the whole request.
1117                          */
1118                         return -ENODEV;
1119                 }
1120         }
1121         return err;
1122 }
1123
1124 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1125 {
1126         md->reset_done &= ~type;
1127 }
1128
1129 int mmc_access_rpmb(struct mmc_queue *mq)
1130 {
1131         struct mmc_blk_data *md = mq->data;
1132         /*
1133          * If this is a RPMB partition access, return ture
1134          */
1135         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1136                 return true;
1137
1138         return false;
1139 }
1140
1141 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1142 {
1143         struct mmc_blk_data *md = mq->data;
1144         struct mmc_card *card = md->queue.card;
1145         unsigned int from, nr, arg;
1146         int err = 0, type = MMC_BLK_DISCARD;
1147
1148         if (!mmc_can_erase(card)) {
1149                 err = -EOPNOTSUPP;
1150                 goto out;
1151         }
1152
1153         from = blk_rq_pos(req);
1154         nr = blk_rq_sectors(req);
1155
1156         if (mmc_can_discard(card))
1157                 arg = MMC_DISCARD_ARG;
1158         else if (mmc_can_trim(card))
1159                 arg = MMC_TRIM_ARG;
1160         else
1161                 arg = MMC_ERASE_ARG;
1162 retry:
1163         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1164                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1165                                  INAND_CMD38_ARG_EXT_CSD,
1166                                  arg == MMC_TRIM_ARG ?
1167                                  INAND_CMD38_ARG_TRIM :
1168                                  INAND_CMD38_ARG_ERASE,
1169                                  0);
1170                 if (err)
1171                         goto out;
1172         }
1173         err = mmc_erase(card, from, nr, arg);
1174 out:
1175         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1176                 goto retry;
1177         if (!err)
1178                 mmc_blk_reset_success(md, type);
1179         blk_end_request(req, err, blk_rq_bytes(req));
1180
1181         return err ? 0 : 1;
1182 }
1183
1184 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1185                                        struct request *req)
1186 {
1187         struct mmc_blk_data *md = mq->data;
1188         struct mmc_card *card = md->queue.card;
1189         unsigned int from, nr, arg;
1190         int err = 0, type = MMC_BLK_SECDISCARD;
1191
1192         if (!(mmc_can_secure_erase_trim(card))) {
1193                 err = -EOPNOTSUPP;
1194                 goto out;
1195         }
1196
1197         from = blk_rq_pos(req);
1198         nr = blk_rq_sectors(req);
1199
1200         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1201                 arg = MMC_SECURE_TRIM1_ARG;
1202         else
1203                 arg = MMC_SECURE_ERASE_ARG;
1204
1205 retry:
1206         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1207                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1208                                  INAND_CMD38_ARG_EXT_CSD,
1209                                  arg == MMC_SECURE_TRIM1_ARG ?
1210                                  INAND_CMD38_ARG_SECTRIM1 :
1211                                  INAND_CMD38_ARG_SECERASE,
1212                                  0);
1213                 if (err)
1214                         goto out_retry;
1215         }
1216
1217         err = mmc_erase(card, from, nr, arg);
1218         if (err == -EIO)
1219                 goto out_retry;
1220         if (err)
1221                 goto out;
1222
1223         if (arg == MMC_SECURE_TRIM1_ARG) {
1224                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1225                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1226                                          INAND_CMD38_ARG_EXT_CSD,
1227                                          INAND_CMD38_ARG_SECTRIM2,
1228                                          0);
1229                         if (err)
1230                                 goto out_retry;
1231                 }
1232
1233                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1234                 if (err == -EIO)
1235                         goto out_retry;
1236                 if (err)
1237                         goto out;
1238         }
1239
1240 out_retry:
1241         if (err && !mmc_blk_reset(md, card->host, type))
1242                 goto retry;
1243         if (!err)
1244                 mmc_blk_reset_success(md, type);
1245 out:
1246         blk_end_request(req, err, blk_rq_bytes(req));
1247
1248         return err ? 0 : 1;
1249 }
1250
1251 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1252 {
1253         struct mmc_blk_data *md = mq->data;
1254         struct mmc_card *card = md->queue.card;
1255         int ret = 0;
1256
1257         ret = mmc_flush_cache(card);
1258         if (ret)
1259                 ret = -EIO;
1260
1261         blk_end_request_all(req, ret);
1262
1263         return ret ? 0 : 1;
1264 }
1265
1266 /*
1267  * Reformat current write as a reliable write, supporting
1268  * both legacy and the enhanced reliable write MMC cards.
1269  * In each transfer we'll handle only as much as a single
1270  * reliable write can handle, thus finish the request in
1271  * partial completions.
1272  */
1273 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1274                                     struct mmc_card *card,
1275                                     struct request *req)
1276 {
1277         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1278                 /* Legacy mode imposes restrictions on transfers. */
1279                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1280                         brq->data.blocks = 1;
1281
1282                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1283                         brq->data.blocks = card->ext_csd.rel_sectors;
1284                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1285                         brq->data.blocks = 1;
1286         }
1287 }
1288
1289 #define CMD_ERRORS                                                      \
1290         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1291          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1292          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1293          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1294          R1_CC_ERROR |          /* Card controller error */             \
1295          R1_ERROR)              /* General/unknown error */
1296
1297 static int mmc_blk_err_check(struct mmc_card *card,
1298                              struct mmc_async_req *areq)
1299 {
1300         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1301                                                     mmc_active);
1302         struct mmc_blk_request *brq = &mq_mrq->brq;
1303         struct request *req = mq_mrq->req;
1304         int need_retune = card->host->need_retune;
1305         int ecc_err = 0, gen_err = 0;
1306
1307         /*
1308          * sbc.error indicates a problem with the set block count
1309          * command.  No data will have been transferred.
1310          *
1311          * cmd.error indicates a problem with the r/w command.  No
1312          * data will have been transferred.
1313          *
1314          * stop.error indicates a problem with the stop command.  Data
1315          * may have been transferred, or may still be transferring.
1316          */
1317         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1318             brq->data.error) {
1319                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1320                 case ERR_RETRY:
1321                         return MMC_BLK_RETRY;
1322                 case ERR_ABORT:
1323                         return MMC_BLK_ABORT;
1324                 case ERR_NOMEDIUM:
1325                         return MMC_BLK_NOMEDIUM;
1326                 case ERR_CONTINUE:
1327                         break;
1328                 }
1329         }
1330
1331         /*
1332          * Check for errors relating to the execution of the
1333          * initial command - such as address errors.  No data
1334          * has been transferred.
1335          */
1336         if (brq->cmd.resp[0] & CMD_ERRORS) {
1337                 pr_err("%s: r/w command failed, status = %#x\n",
1338                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1339                 return MMC_BLK_ABORT;
1340         }
1341
1342         /*
1343          * Everything else is either success, or a data error of some
1344          * kind.  If it was a write, we may have transitioned to
1345          * program mode, which we have to wait for it to complete.
1346          */
1347         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1348                 int err;
1349
1350                 /* Check stop command response */
1351                 if (brq->stop.resp[0] & R1_ERROR) {
1352                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1353                                req->rq_disk->disk_name, __func__,
1354                                brq->stop.resp[0]);
1355                         gen_err = 1;
1356                 }
1357
1358                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1359                                         &gen_err);
1360                 if (err)
1361                         return MMC_BLK_CMD_ERR;
1362         }
1363
1364         /* if general error occurs, retry the write operation. */
1365         if (gen_err) {
1366                 pr_warn("%s: retrying write for general error\n",
1367                                 req->rq_disk->disk_name);
1368                 return MMC_BLK_RETRY;
1369         }
1370
1371         if (brq->data.error) {
1372                 if (need_retune && !brq->retune_retry_done) {
1373                         pr_debug("%s: retrying because a re-tune was needed\n",
1374                                  req->rq_disk->disk_name);
1375                         brq->retune_retry_done = 1;
1376                         return MMC_BLK_RETRY;
1377                 }
1378                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1379                        req->rq_disk->disk_name, brq->data.error,
1380                        (unsigned)blk_rq_pos(req),
1381                        (unsigned)blk_rq_sectors(req),
1382                        brq->cmd.resp[0], brq->stop.resp[0]);
1383
1384                 if (rq_data_dir(req) == READ) {
1385                         if (ecc_err)
1386                                 return MMC_BLK_ECC_ERR;
1387                         return MMC_BLK_DATA_ERR;
1388                 } else {
1389                         return MMC_BLK_CMD_ERR;
1390                 }
1391         }
1392
1393         if (!brq->data.bytes_xfered)
1394                 return MMC_BLK_RETRY;
1395
1396         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1397                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1398                         return MMC_BLK_PARTIAL;
1399                 else
1400                         return MMC_BLK_SUCCESS;
1401         }
1402
1403         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1404                 return MMC_BLK_PARTIAL;
1405
1406         return MMC_BLK_SUCCESS;
1407 }
1408
1409 static int mmc_blk_packed_err_check(struct mmc_card *card,
1410                                     struct mmc_async_req *areq)
1411 {
1412         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1413                         mmc_active);
1414         struct request *req = mq_rq->req;
1415         struct mmc_packed *packed = mq_rq->packed;
1416         int err, check, status;
1417         u8 *ext_csd;
1418
1419         BUG_ON(!packed);
1420
1421         packed->retries--;
1422         check = mmc_blk_err_check(card, areq);
1423         err = get_card_status(card, &status, 0);
1424         if (err) {
1425                 pr_err("%s: error %d sending status command\n",
1426                        req->rq_disk->disk_name, err);
1427                 return MMC_BLK_ABORT;
1428         }
1429
1430         if (status & R1_EXCEPTION_EVENT) {
1431                 err = mmc_get_ext_csd(card, &ext_csd);
1432                 if (err) {
1433                         pr_err("%s: error %d sending ext_csd\n",
1434                                req->rq_disk->disk_name, err);
1435                         return MMC_BLK_ABORT;
1436                 }
1437
1438                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1439                      EXT_CSD_PACKED_FAILURE) &&
1440                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1441                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1442                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1443                             EXT_CSD_PACKED_INDEXED_ERROR) {
1444                                 packed->idx_failure =
1445                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1446                                 check = MMC_BLK_PARTIAL;
1447                         }
1448                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1449                                "failure index: %d\n",
1450                                req->rq_disk->disk_name, packed->nr_entries,
1451                                packed->blocks, packed->idx_failure);
1452                 }
1453                 kfree(ext_csd);
1454         }
1455
1456         return check;
1457 }
1458
1459 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1460                                struct mmc_card *card,
1461                                int disable_multi,
1462                                struct mmc_queue *mq)
1463 {
1464         u32 readcmd, writecmd;
1465         struct mmc_blk_request *brq = &mqrq->brq;
1466         struct request *req = mqrq->req;
1467         struct mmc_blk_data *md = mq->data;
1468         bool do_data_tag;
1469
1470         /*
1471          * Reliable writes are used to implement Forced Unit Access and
1472          * are supported only on MMCs.
1473          */
1474         bool do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1475                 (rq_data_dir(req) == WRITE) &&
1476                 (md->flags & MMC_BLK_REL_WR);
1477
1478         memset(brq, 0, sizeof(struct mmc_blk_request));
1479         brq->mrq.cmd = &brq->cmd;
1480         brq->mrq.data = &brq->data;
1481
1482         brq->cmd.arg = blk_rq_pos(req);
1483         if (!mmc_card_blockaddr(card))
1484                 brq->cmd.arg <<= 9;
1485         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1486         brq->data.blksz = 512;
1487         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1488         brq->stop.arg = 0;
1489         brq->data.blocks = blk_rq_sectors(req);
1490
1491         /*
1492          * The block layer doesn't support all sector count
1493          * restrictions, so we need to be prepared for too big
1494          * requests.
1495          */
1496         if (brq->data.blocks > card->host->max_blk_count)
1497                 brq->data.blocks = card->host->max_blk_count;
1498
1499         if (brq->data.blocks > 1) {
1500                 /*
1501                  * After a read error, we redo the request one sector
1502                  * at a time in order to accurately determine which
1503                  * sectors can be read successfully.
1504                  */
1505                 if (disable_multi)
1506                         brq->data.blocks = 1;
1507
1508                 /*
1509                  * Some controllers have HW issues while operating
1510                  * in multiple I/O mode
1511                  */
1512                 if (card->host->ops->multi_io_quirk)
1513                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1514                                                 (rq_data_dir(req) == READ) ?
1515                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1516                                                 brq->data.blocks);
1517         }
1518
1519         if (brq->data.blocks > 1 || do_rel_wr) {
1520                 /* SPI multiblock writes terminate using a special
1521                  * token, not a STOP_TRANSMISSION request.
1522                  */
1523                 if (!mmc_host_is_spi(card->host) ||
1524                     rq_data_dir(req) == READ)
1525                         brq->mrq.stop = &brq->stop;
1526                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1527                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1528         } else {
1529                 brq->mrq.stop = NULL;
1530                 readcmd = MMC_READ_SINGLE_BLOCK;
1531                 writecmd = MMC_WRITE_BLOCK;
1532         }
1533         if (rq_data_dir(req) == READ) {
1534                 brq->cmd.opcode = readcmd;
1535                 brq->data.flags = MMC_DATA_READ;
1536                 if (brq->mrq.stop)
1537                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1538                                         MMC_CMD_AC;
1539         } else {
1540                 brq->cmd.opcode = writecmd;
1541                 brq->data.flags = MMC_DATA_WRITE;
1542                 if (brq->mrq.stop)
1543                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1544                                         MMC_CMD_AC;
1545         }
1546
1547         if (do_rel_wr)
1548                 mmc_apply_rel_rw(brq, card, req);
1549
1550         /*
1551          * Data tag is used only during writing meta data to speed
1552          * up write and any subsequent read of this meta data
1553          */
1554         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1555                 (req->cmd_flags & REQ_META) &&
1556                 (rq_data_dir(req) == WRITE) &&
1557                 ((brq->data.blocks * brq->data.blksz) >=
1558                  card->ext_csd.data_tag_unit_size);
1559
1560         /*
1561          * Pre-defined multi-block transfers are preferable to
1562          * open ended-ones (and necessary for reliable writes).
1563          * However, it is not sufficient to just send CMD23,
1564          * and avoid the final CMD12, as on an error condition
1565          * CMD12 (stop) needs to be sent anyway. This, coupled
1566          * with Auto-CMD23 enhancements provided by some
1567          * hosts, means that the complexity of dealing
1568          * with this is best left to the host. If CMD23 is
1569          * supported by card and host, we'll fill sbc in and let
1570          * the host deal with handling it correctly. This means
1571          * that for hosts that don't expose MMC_CAP_CMD23, no
1572          * change of behavior will be observed.
1573          *
1574          * N.B: Some MMC cards experience perf degradation.
1575          * We'll avoid using CMD23-bounded multiblock writes for
1576          * these, while retaining features like reliable writes.
1577          */
1578         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1579             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1580              do_data_tag)) {
1581                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1582                 brq->sbc.arg = brq->data.blocks |
1583                         (do_rel_wr ? (1 << 31) : 0) |
1584                         (do_data_tag ? (1 << 29) : 0);
1585                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1586                 brq->mrq.sbc = &brq->sbc;
1587         }
1588
1589         mmc_set_data_timeout(&brq->data, card);
1590
1591         brq->data.sg = mqrq->sg;
1592         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1593
1594         /*
1595          * Adjust the sg list so it is the same size as the
1596          * request.
1597          */
1598         if (brq->data.blocks != blk_rq_sectors(req)) {
1599                 int i, data_size = brq->data.blocks << 9;
1600                 struct scatterlist *sg;
1601
1602                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1603                         data_size -= sg->length;
1604                         if (data_size <= 0) {
1605                                 sg->length += data_size;
1606                                 i++;
1607                                 break;
1608                         }
1609                 }
1610                 brq->data.sg_len = i;
1611         }
1612
1613         mqrq->mmc_active.mrq = &brq->mrq;
1614         mqrq->mmc_active.err_check = mmc_blk_err_check;
1615
1616         mmc_queue_bounce_pre(mqrq);
1617 }
1618
1619 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1620                                           struct mmc_card *card)
1621 {
1622         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1623         unsigned int max_seg_sz = queue_max_segment_size(q);
1624         unsigned int len, nr_segs = 0;
1625
1626         do {
1627                 len = min(hdr_sz, max_seg_sz);
1628                 hdr_sz -= len;
1629                 nr_segs++;
1630         } while (hdr_sz);
1631
1632         return nr_segs;
1633 }
1634
1635 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1636 {
1637         struct request_queue *q = mq->queue;
1638         struct mmc_card *card = mq->card;
1639         struct request *cur = req, *next = NULL;
1640         struct mmc_blk_data *md = mq->data;
1641         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1642         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1643         unsigned int req_sectors = 0, phys_segments = 0;
1644         unsigned int max_blk_count, max_phys_segs;
1645         bool put_back = true;
1646         u8 max_packed_rw = 0;
1647         u8 reqs = 0;
1648
1649         if (!(md->flags & MMC_BLK_PACKED_CMD))
1650                 goto no_packed;
1651
1652         if ((rq_data_dir(cur) == WRITE) &&
1653             mmc_host_packed_wr(card->host))
1654                 max_packed_rw = card->ext_csd.max_packed_writes;
1655
1656         if (max_packed_rw == 0)
1657                 goto no_packed;
1658
1659         if (mmc_req_rel_wr(cur) &&
1660             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1661                 goto no_packed;
1662
1663         if (mmc_large_sector(card) &&
1664             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1665                 goto no_packed;
1666
1667         mmc_blk_clear_packed(mqrq);
1668
1669         max_blk_count = min(card->host->max_blk_count,
1670                             card->host->max_req_size >> 9);
1671         if (unlikely(max_blk_count > 0xffff))
1672                 max_blk_count = 0xffff;
1673
1674         max_phys_segs = queue_max_segments(q);
1675         req_sectors += blk_rq_sectors(cur);
1676         phys_segments += cur->nr_phys_segments;
1677
1678         if (rq_data_dir(cur) == WRITE) {
1679                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1680                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1681         }
1682
1683         do {
1684                 if (reqs >= max_packed_rw - 1) {
1685                         put_back = false;
1686                         break;
1687                 }
1688
1689                 spin_lock_irq(q->queue_lock);
1690                 next = blk_fetch_request(q);
1691                 spin_unlock_irq(q->queue_lock);
1692                 if (!next) {
1693                         put_back = false;
1694                         break;
1695                 }
1696
1697                 if (mmc_large_sector(card) &&
1698                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1699                         break;
1700
1701                 if (next->cmd_flags & REQ_DISCARD ||
1702                     next->cmd_flags & REQ_FLUSH)
1703                         break;
1704
1705                 if (rq_data_dir(cur) != rq_data_dir(next))
1706                         break;
1707
1708                 if (mmc_req_rel_wr(next) &&
1709                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1710                         break;
1711
1712                 req_sectors += blk_rq_sectors(next);
1713                 if (req_sectors > max_blk_count)
1714                         break;
1715
1716                 phys_segments +=  next->nr_phys_segments;
1717                 if (phys_segments > max_phys_segs)
1718                         break;
1719
1720                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1721                 cur = next;
1722                 reqs++;
1723         } while (1);
1724
1725         if (put_back) {
1726                 spin_lock_irq(q->queue_lock);
1727                 blk_requeue_request(q, next);
1728                 spin_unlock_irq(q->queue_lock);
1729         }
1730
1731         if (reqs > 0) {
1732                 list_add(&req->queuelist, &mqrq->packed->list);
1733                 mqrq->packed->nr_entries = ++reqs;
1734                 mqrq->packed->retries = reqs;
1735                 return reqs;
1736         }
1737
1738 no_packed:
1739         mqrq->cmd_type = MMC_PACKED_NONE;
1740         return 0;
1741 }
1742
1743 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1744                                         struct mmc_card *card,
1745                                         struct mmc_queue *mq)
1746 {
1747         struct mmc_blk_request *brq = &mqrq->brq;
1748         struct request *req = mqrq->req;
1749         struct request *prq;
1750         struct mmc_blk_data *md = mq->data;
1751         struct mmc_packed *packed = mqrq->packed;
1752         bool do_rel_wr, do_data_tag;
1753         u32 *packed_cmd_hdr;
1754         u8 hdr_blocks;
1755         u8 i = 1;
1756
1757         BUG_ON(!packed);
1758
1759         mqrq->cmd_type = MMC_PACKED_WRITE;
1760         packed->blocks = 0;
1761         packed->idx_failure = MMC_PACKED_NR_IDX;
1762
1763         packed_cmd_hdr = packed->cmd_hdr;
1764         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1765         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1766                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1767         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1768
1769         /*
1770          * Argument for each entry of packed group
1771          */
1772         list_for_each_entry(prq, &packed->list, queuelist) {
1773                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1774                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1775                         (prq->cmd_flags & REQ_META) &&
1776                         (rq_data_dir(prq) == WRITE) &&
1777                         ((brq->data.blocks * brq->data.blksz) >=
1778                          card->ext_csd.data_tag_unit_size);
1779                 /* Argument of CMD23 */
1780                 packed_cmd_hdr[(i * 2)] =
1781                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1782                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1783                         blk_rq_sectors(prq);
1784                 /* Argument of CMD18 or CMD25 */
1785                 packed_cmd_hdr[((i * 2)) + 1] =
1786                         mmc_card_blockaddr(card) ?
1787                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1788                 packed->blocks += blk_rq_sectors(prq);
1789                 i++;
1790         }
1791
1792         memset(brq, 0, sizeof(struct mmc_blk_request));
1793         brq->mrq.cmd = &brq->cmd;
1794         brq->mrq.data = &brq->data;
1795         brq->mrq.sbc = &brq->sbc;
1796         brq->mrq.stop = &brq->stop;
1797
1798         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1799         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1800         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1801
1802         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1803         brq->cmd.arg = blk_rq_pos(req);
1804         if (!mmc_card_blockaddr(card))
1805                 brq->cmd.arg <<= 9;
1806         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1807
1808         brq->data.blksz = 512;
1809         brq->data.blocks = packed->blocks + hdr_blocks;
1810         brq->data.flags = MMC_DATA_WRITE;
1811
1812         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1813         brq->stop.arg = 0;
1814         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1815
1816         mmc_set_data_timeout(&brq->data, card);
1817
1818         brq->data.sg = mqrq->sg;
1819         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1820
1821         mqrq->mmc_active.mrq = &brq->mrq;
1822         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1823
1824         mmc_queue_bounce_pre(mqrq);
1825 }
1826
1827 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1828                            struct mmc_blk_request *brq, struct request *req,
1829                            int ret)
1830 {
1831         struct mmc_queue_req *mq_rq;
1832         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1833
1834         /*
1835          * If this is an SD card and we're writing, we can first
1836          * mark the known good sectors as ok.
1837          *
1838          * If the card is not SD, we can still ok written sectors
1839          * as reported by the controller (which might be less than
1840          * the real number of written sectors, but never more).
1841          */
1842         if (mmc_card_sd(card)) {
1843                 u32 blocks;
1844
1845                 blocks = mmc_sd_num_wr_blocks(card);
1846                 if (blocks != (u32)-1) {
1847                         ret = blk_end_request(req, 0, blocks << 9);
1848                 }
1849         } else {
1850                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1851                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1852         }
1853         return ret;
1854 }
1855
1856 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1857 {
1858         struct request *prq;
1859         struct mmc_packed *packed = mq_rq->packed;
1860         int idx = packed->idx_failure, i = 0;
1861         int ret = 0;
1862
1863         BUG_ON(!packed);
1864
1865         while (!list_empty(&packed->list)) {
1866                 prq = list_entry_rq(packed->list.next);
1867                 if (idx == i) {
1868                         /* retry from error index */
1869                         packed->nr_entries -= idx;
1870                         mq_rq->req = prq;
1871                         ret = 1;
1872
1873                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1874                                 list_del_init(&prq->queuelist);
1875                                 mmc_blk_clear_packed(mq_rq);
1876                         }
1877                         return ret;
1878                 }
1879                 list_del_init(&prq->queuelist);
1880                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1881                 i++;
1882         }
1883
1884         mmc_blk_clear_packed(mq_rq);
1885         return ret;
1886 }
1887
1888 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1889 {
1890         struct request *prq;
1891         struct mmc_packed *packed = mq_rq->packed;
1892
1893         BUG_ON(!packed);
1894
1895         while (!list_empty(&packed->list)) {
1896                 prq = list_entry_rq(packed->list.next);
1897                 list_del_init(&prq->queuelist);
1898                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1899         }
1900
1901         mmc_blk_clear_packed(mq_rq);
1902 }
1903
1904 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1905                                       struct mmc_queue_req *mq_rq)
1906 {
1907         struct request *prq;
1908         struct request_queue *q = mq->queue;
1909         struct mmc_packed *packed = mq_rq->packed;
1910
1911         BUG_ON(!packed);
1912
1913         while (!list_empty(&packed->list)) {
1914                 prq = list_entry_rq(packed->list.prev);
1915                 if (prq->queuelist.prev != &packed->list) {
1916                         list_del_init(&prq->queuelist);
1917                         spin_lock_irq(q->queue_lock);
1918                         blk_requeue_request(mq->queue, prq);
1919                         spin_unlock_irq(q->queue_lock);
1920                 } else {
1921                         list_del_init(&prq->queuelist);
1922                 }
1923         }
1924
1925         mmc_blk_clear_packed(mq_rq);
1926 }
1927
1928 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1929 {
1930         struct mmc_blk_data *md = mq->data;
1931         struct mmc_card *card = md->queue.card;
1932         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1933         int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1934         enum mmc_blk_status status;
1935         struct mmc_queue_req *mq_rq;
1936         struct request *req = rqc;
1937         struct mmc_async_req *areq;
1938         const u8 packed_nr = 2;
1939         u8 reqs = 0;
1940
1941         if (!rqc && !mq->mqrq_prev->req)
1942                 return 0;
1943
1944         if (rqc)
1945                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1946
1947         do {
1948                 if (rqc) {
1949                         /*
1950                          * When 4KB native sector is enabled, only 8 blocks
1951                          * multiple read or write is allowed
1952                          */
1953                         if ((brq->data.blocks & 0x07) &&
1954                             (card->ext_csd.data_sector_size == 4096)) {
1955                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1956                                         req->rq_disk->disk_name);
1957                                 mq_rq = mq->mqrq_cur;
1958                                 goto cmd_abort;
1959                         }
1960
1961                         if (reqs >= packed_nr)
1962                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1963                                                             card, mq);
1964                         else
1965                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1966                         areq = &mq->mqrq_cur->mmc_active;
1967                 } else
1968                         areq = NULL;
1969                 areq = mmc_start_req(card->host, areq, (int *) &status);
1970                 if (!areq) {
1971                         if (status == MMC_BLK_NEW_REQUEST)
1972                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1973                         return 0;
1974                 }
1975
1976                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1977                 brq = &mq_rq->brq;
1978                 req = mq_rq->req;
1979                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1980                 mmc_queue_bounce_post(mq_rq);
1981
1982                 switch (status) {
1983                 case MMC_BLK_SUCCESS:
1984                 case MMC_BLK_PARTIAL:
1985                         /*
1986                          * A block was successfully transferred.
1987                          */
1988                         mmc_blk_reset_success(md, type);
1989
1990                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1991                                 ret = mmc_blk_end_packed_req(mq_rq);
1992                                 break;
1993                         } else {
1994                                 ret = blk_end_request(req, 0,
1995                                                 brq->data.bytes_xfered);
1996                         }
1997
1998                         /*
1999                          * If the blk_end_request function returns non-zero even
2000                          * though all data has been transferred and no errors
2001                          * were returned by the host controller, it's a bug.
2002                          */
2003                         if (status == MMC_BLK_SUCCESS && ret) {
2004                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
2005                                        __func__, blk_rq_bytes(req),
2006                                        brq->data.bytes_xfered);
2007                                 rqc = NULL;
2008                                 goto cmd_abort;
2009                         }
2010                         break;
2011                 case MMC_BLK_CMD_ERR:
2012                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
2013                         if (mmc_blk_reset(md, card->host, type))
2014                                 goto cmd_abort;
2015                         if (!ret)
2016                                 goto start_new_req;
2017                         break;
2018                 case MMC_BLK_RETRY:
2019                         retune_retry_done = brq->retune_retry_done;
2020                         if (retry++ < 5)
2021                                 break;
2022                         /* Fall through */
2023                 case MMC_BLK_ABORT:
2024                         if (!mmc_blk_reset(md, card->host, type))
2025                                 break;
2026                         goto cmd_abort;
2027                 case MMC_BLK_DATA_ERR: {
2028                         int err;
2029
2030                         err = mmc_blk_reset(md, card->host, type);
2031                         if (!err)
2032                                 break;
2033                         if (err == -ENODEV ||
2034                                 mmc_packed_cmd(mq_rq->cmd_type))
2035                                 goto cmd_abort;
2036                         /* Fall through */
2037                 }
2038                 case MMC_BLK_ECC_ERR:
2039                         if (brq->data.blocks > 1) {
2040                                 /* Redo read one sector at a time */
2041                                 pr_warn("%s: retrying using single block read\n",
2042                                         req->rq_disk->disk_name);
2043                                 disable_multi = 1;
2044                                 break;
2045                         }
2046                         /*
2047                          * After an error, we redo I/O one sector at a
2048                          * time, so we only reach here after trying to
2049                          * read a single sector.
2050                          */
2051                         ret = blk_end_request(req, -EIO,
2052                                                 brq->data.blksz);
2053                         if (!ret)
2054                                 goto start_new_req;
2055                         break;
2056                 case MMC_BLK_NOMEDIUM:
2057                         goto cmd_abort;
2058                 default:
2059                         pr_err("%s: Unhandled return value (%d)",
2060                                         req->rq_disk->disk_name, status);
2061                         goto cmd_abort;
2062                 }
2063
2064                 if (ret) {
2065                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2066                                 if (!mq_rq->packed->retries)
2067                                         goto cmd_abort;
2068                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
2069                                 mmc_start_req(card->host,
2070                                               &mq_rq->mmc_active, NULL);
2071                         } else {
2072
2073                                 /*
2074                                  * In case of a incomplete request
2075                                  * prepare it again and resend.
2076                                  */
2077                                 mmc_blk_rw_rq_prep(mq_rq, card,
2078                                                 disable_multi, mq);
2079                                 mmc_start_req(card->host,
2080                                                 &mq_rq->mmc_active, NULL);
2081                         }
2082                         mq_rq->brq.retune_retry_done = retune_retry_done;
2083                 }
2084         } while (ret);
2085
2086         return 1;
2087
2088  cmd_abort:
2089         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2090                 mmc_blk_abort_packed_req(mq_rq);
2091         } else {
2092                 if (mmc_card_removed(card))
2093                         req->cmd_flags |= REQ_QUIET;
2094                 while (ret)
2095                         ret = blk_end_request(req, -EIO,
2096                                         blk_rq_cur_bytes(req));
2097         }
2098
2099  start_new_req:
2100         if (rqc) {
2101                 if (mmc_card_removed(card)) {
2102                         rqc->cmd_flags |= REQ_QUIET;
2103                         blk_end_request_all(rqc, -EIO);
2104                 } else {
2105                         /*
2106                          * If current request is packed, it needs to put back.
2107                          */
2108                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2109                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2110
2111                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2112                         mmc_start_req(card->host,
2113                                       &mq->mqrq_cur->mmc_active, NULL);
2114                 }
2115         }
2116
2117         return 0;
2118 }
2119
2120 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2121 {
2122         int ret;
2123         struct mmc_blk_data *md = mq->data;
2124         struct mmc_card *card = md->queue.card;
2125         struct mmc_host *host = card->host;
2126         unsigned long flags;
2127         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2128
2129         if (req && !mq->mqrq_prev->req)
2130                 /* claim host only for the first request */
2131                 mmc_get_card(card);
2132
2133         ret = mmc_blk_part_switch(card, md);
2134         if (ret) {
2135                 if (req) {
2136                         blk_end_request_all(req, -EIO);
2137                 }
2138                 ret = 0;
2139                 goto out;
2140         }
2141
2142         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2143         if (cmd_flags & REQ_DISCARD) {
2144                 /* complete ongoing async transfer before issuing discard */
2145                 if (card->host->areq)
2146                         mmc_blk_issue_rw_rq(mq, NULL);
2147                 if (req->cmd_flags & REQ_SECURE)
2148                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2149                 else
2150                         ret = mmc_blk_issue_discard_rq(mq, req);
2151         } else if (cmd_flags & REQ_FLUSH) {
2152                 /* complete ongoing async transfer before issuing flush */
2153                 if (card->host->areq)
2154                         mmc_blk_issue_rw_rq(mq, NULL);
2155                 ret = mmc_blk_issue_flush(mq, req);
2156         } else {
2157                 if (!req && host->areq) {
2158                         spin_lock_irqsave(&host->context_info.lock, flags);
2159                         host->context_info.is_waiting_last_req = true;
2160                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2161                 }
2162                 ret = mmc_blk_issue_rw_rq(mq, req);
2163         }
2164
2165 out:
2166         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2167              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2168                 /*
2169                  * Release host when there are no more requests
2170                  * and after special request(discard, flush) is done.
2171                  * In case sepecial request, there is no reentry to
2172                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2173                  */
2174                 mmc_put_card(card);
2175         return ret;
2176 }
2177
2178 static inline int mmc_blk_readonly(struct mmc_card *card)
2179 {
2180         return mmc_card_readonly(card) ||
2181                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2182 }
2183
2184 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2185                                               struct device *parent,
2186                                               sector_t size,
2187                                               bool default_ro,
2188                                               const char *subname,
2189                                               int area_type)
2190 {
2191         struct mmc_blk_data *md;
2192         int devidx, ret;
2193
2194         devidx = find_first_zero_bit(dev_use, max_devices);
2195         if (devidx >= max_devices)
2196                 return ERR_PTR(-ENOSPC);
2197         __set_bit(devidx, dev_use);
2198
2199         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2200         if (!md) {
2201                 ret = -ENOMEM;
2202                 goto out;
2203         }
2204
2205         /*
2206          * !subname implies we are creating main mmc_blk_data that will be
2207          * associated with mmc_card with dev_set_drvdata. Due to device
2208          * partitions, devidx will not coincide with a per-physical card
2209          * index anymore so we keep track of a name index.
2210          */
2211         if (!subname) {
2212                 md->name_idx = find_first_zero_bit(name_use, max_devices);
2213                 __set_bit(md->name_idx, name_use);
2214         } else
2215                 md->name_idx = ((struct mmc_blk_data *)
2216                                 dev_to_disk(parent)->private_data)->name_idx;
2217
2218         md->area_type = area_type;
2219
2220         /*
2221          * Set the read-only status based on the supported commands
2222          * and the write protect switch.
2223          */
2224         md->read_only = mmc_blk_readonly(card);
2225
2226         md->disk = alloc_disk(perdev_minors);
2227         if (md->disk == NULL) {
2228                 ret = -ENOMEM;
2229                 goto err_kfree;
2230         }
2231
2232         spin_lock_init(&md->lock);
2233         INIT_LIST_HEAD(&md->part);
2234         md->usage = 1;
2235
2236         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2237         if (ret)
2238                 goto err_putdisk;
2239
2240         md->queue.issue_fn = mmc_blk_issue_rq;
2241         md->queue.data = md;
2242
2243         md->disk->major = MMC_BLOCK_MAJOR;
2244         md->disk->first_minor = devidx * perdev_minors;
2245         md->disk->fops = &mmc_bdops;
2246         md->disk->private_data = md;
2247         md->disk->queue = md->queue.queue;
2248         md->disk->driverfs_dev = parent;
2249         set_disk_ro(md->disk, md->read_only || default_ro);
2250         md->disk->flags = GENHD_FL_EXT_DEVT;
2251         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2252                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2253
2254         /*
2255          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2256          *
2257          * - be set for removable media with permanent block devices
2258          * - be unset for removable block devices with permanent media
2259          *
2260          * Since MMC block devices clearly fall under the second
2261          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2262          * should use the block device creation/destruction hotplug
2263          * messages to tell when the card is present.
2264          */
2265
2266         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2267                  "mmcblk%u%s", md->name_idx, subname ? subname : "");
2268
2269         if (mmc_card_mmc(card))
2270                 blk_queue_logical_block_size(md->queue.queue,
2271                                              card->ext_csd.data_sector_size);
2272         else
2273                 blk_queue_logical_block_size(md->queue.queue, 512);
2274
2275         set_capacity(md->disk, size);
2276
2277         if (mmc_host_cmd23(card->host)) {
2278                 if (mmc_card_mmc(card) ||
2279                     (mmc_card_sd(card) &&
2280                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2281                         md->flags |= MMC_BLK_CMD23;
2282         }
2283
2284         if (mmc_card_mmc(card) &&
2285             md->flags & MMC_BLK_CMD23 &&
2286             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2287              card->ext_csd.rel_sectors)) {
2288                 md->flags |= MMC_BLK_REL_WR;
2289                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2290         }
2291
2292         if (mmc_card_mmc(card) &&
2293             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2294             (md->flags & MMC_BLK_CMD23) &&
2295             card->ext_csd.packed_event_en) {
2296                 if (!mmc_packed_init(&md->queue, card))
2297                         md->flags |= MMC_BLK_PACKED_CMD;
2298         }
2299
2300         return md;
2301
2302  err_putdisk:
2303         put_disk(md->disk);
2304  err_kfree:
2305         kfree(md);
2306  out:
2307         return ERR_PTR(ret);
2308 }
2309
2310 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2311 {
2312         sector_t size;
2313
2314         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2315                 /*
2316                  * The EXT_CSD sector count is in number or 512 byte
2317                  * sectors.
2318                  */
2319                 size = card->ext_csd.sectors;
2320         } else {
2321                 /*
2322                  * The CSD capacity field is in units of read_blkbits.
2323                  * set_capacity takes units of 512 bytes.
2324                  */
2325                 size = (typeof(sector_t))card->csd.capacity
2326                         << (card->csd.read_blkbits - 9);
2327         }
2328
2329         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2330                                         MMC_BLK_DATA_AREA_MAIN);
2331 }
2332
2333 static int mmc_blk_alloc_part(struct mmc_card *card,
2334                               struct mmc_blk_data *md,
2335                               unsigned int part_type,
2336                               sector_t size,
2337                               bool default_ro,
2338                               const char *subname,
2339                               int area_type)
2340 {
2341         char cap_str[10];
2342         struct mmc_blk_data *part_md;
2343
2344         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2345                                     subname, area_type);
2346         if (IS_ERR(part_md))
2347                 return PTR_ERR(part_md);
2348         part_md->part_type = part_type;
2349         list_add(&part_md->part, &md->part);
2350
2351         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2352                         cap_str, sizeof(cap_str));
2353         pr_info("%s: %s %s partition %u %s\n",
2354                part_md->disk->disk_name, mmc_card_id(card),
2355                mmc_card_name(card), part_md->part_type, cap_str);
2356         return 0;
2357 }
2358
2359 /* MMC Physical partitions consist of two boot partitions and
2360  * up to four general purpose partitions.
2361  * For each partition enabled in EXT_CSD a block device will be allocatedi
2362  * to provide access to the partition.
2363  */
2364
2365 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2366 {
2367         int idx, ret = 0;
2368
2369         if (!mmc_card_mmc(card))
2370                 return 0;
2371
2372         for (idx = 0; idx < card->nr_parts; idx++) {
2373                 if (card->part[idx].size) {
2374                         ret = mmc_blk_alloc_part(card, md,
2375                                 card->part[idx].part_cfg,
2376                                 card->part[idx].size >> 9,
2377                                 card->part[idx].force_ro,
2378                                 card->part[idx].name,
2379                                 card->part[idx].area_type);
2380                         if (ret)
2381                                 return ret;
2382                 }
2383         }
2384
2385         return ret;
2386 }
2387
2388 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2389 {
2390         struct mmc_card *card;
2391
2392         if (md) {
2393                 /*
2394                  * Flush remaining requests and free queues. It
2395                  * is freeing the queue that stops new requests
2396                  * from being accepted.
2397                  */
2398                 card = md->queue.card;
2399                 mmc_cleanup_queue(&md->queue);
2400                 if (md->flags & MMC_BLK_PACKED_CMD)
2401                         mmc_packed_clean(&md->queue);
2402                 if (md->disk->flags & GENHD_FL_UP) {
2403                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2404                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2405                                         card->ext_csd.boot_ro_lockable)
2406                                 device_remove_file(disk_to_dev(md->disk),
2407                                         &md->power_ro_lock);
2408
2409                         del_gendisk(md->disk);
2410                 }
2411                 mmc_blk_put(md);
2412         }
2413 }
2414
2415 static void mmc_blk_remove_parts(struct mmc_card *card,
2416                                  struct mmc_blk_data *md)
2417 {
2418         struct list_head *pos, *q;
2419         struct mmc_blk_data *part_md;
2420
2421         __clear_bit(md->name_idx, name_use);
2422         list_for_each_safe(pos, q, &md->part) {
2423                 part_md = list_entry(pos, struct mmc_blk_data, part);
2424                 list_del(pos);
2425                 mmc_blk_remove_req(part_md);
2426         }
2427 }
2428
2429 static int mmc_add_disk(struct mmc_blk_data *md)
2430 {
2431         int ret;
2432         struct mmc_card *card = md->queue.card;
2433
2434         add_disk(md->disk);
2435         md->force_ro.show = force_ro_show;
2436         md->force_ro.store = force_ro_store;
2437         sysfs_attr_init(&md->force_ro.attr);
2438         md->force_ro.attr.name = "force_ro";
2439         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2440         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2441         if (ret)
2442                 goto force_ro_fail;
2443
2444         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2445              card->ext_csd.boot_ro_lockable) {
2446                 umode_t mode;
2447
2448                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2449                         mode = S_IRUGO;
2450                 else
2451                         mode = S_IRUGO | S_IWUSR;
2452
2453                 md->power_ro_lock.show = power_ro_lock_show;
2454                 md->power_ro_lock.store = power_ro_lock_store;
2455                 sysfs_attr_init(&md->power_ro_lock.attr);
2456                 md->power_ro_lock.attr.mode = mode;
2457                 md->power_ro_lock.attr.name =
2458                                         "ro_lock_until_next_power_on";
2459                 ret = device_create_file(disk_to_dev(md->disk),
2460                                 &md->power_ro_lock);
2461                 if (ret)
2462                         goto power_ro_lock_fail;
2463         }
2464         return ret;
2465
2466 power_ro_lock_fail:
2467         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2468 force_ro_fail:
2469         del_gendisk(md->disk);
2470
2471         return ret;
2472 }
2473
2474 #define CID_MANFID_SANDISK      0x2
2475 #define CID_MANFID_TOSHIBA      0x11
2476 #define CID_MANFID_MICRON       0x13
2477 #define CID_MANFID_SAMSUNG      0x15
2478 #define CID_MANFID_KINGSTON     0x70
2479
2480 static const struct mmc_fixup blk_fixups[] =
2481 {
2482         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2483                   MMC_QUIRK_INAND_CMD38),
2484         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2485                   MMC_QUIRK_INAND_CMD38),
2486         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2487                   MMC_QUIRK_INAND_CMD38),
2488         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2489                   MMC_QUIRK_INAND_CMD38),
2490         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2491                   MMC_QUIRK_INAND_CMD38),
2492
2493         /*
2494          * Some MMC cards experience performance degradation with CMD23
2495          * instead of CMD12-bounded multiblock transfers. For now we'll
2496          * black list what's bad...
2497          * - Certain Toshiba cards.
2498          *
2499          * N.B. This doesn't affect SD cards.
2500          */
2501         MMC_FIXUP("SDMB-32", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2502                   MMC_QUIRK_BLK_NO_CMD23),
2503         MMC_FIXUP("SDM032", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2504                   MMC_QUIRK_BLK_NO_CMD23),
2505         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2506                   MMC_QUIRK_BLK_NO_CMD23),
2507         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2508                   MMC_QUIRK_BLK_NO_CMD23),
2509         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2510                   MMC_QUIRK_BLK_NO_CMD23),
2511
2512         /*
2513          * Some Micron MMC cards needs longer data read timeout than
2514          * indicated in CSD.
2515          */
2516         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2517                   MMC_QUIRK_LONG_READ_TIME),
2518
2519         /*
2520          * On these Samsung MoviNAND parts, performing secure erase or
2521          * secure trim can result in unrecoverable corruption due to a
2522          * firmware bug.
2523          */
2524         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2525                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2526         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2527                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2528         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2529                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2530         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2531                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2532         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2533                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2534         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2535                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2536         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2537                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2538         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2539                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2540
2541         /*
2542          *  On Some Kingston eMMCs, performing trim can result in
2543          *  unrecoverable data conrruption occasionally due to a firmware bug.
2544          */
2545         MMC_FIXUP("V10008", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2546                   MMC_QUIRK_TRIM_BROKEN),
2547         MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2548                   MMC_QUIRK_TRIM_BROKEN),
2549
2550         END_FIXUP
2551 };
2552
2553 static int mmc_blk_probe(struct mmc_card *card)
2554 {
2555         struct mmc_blk_data *md, *part_md;
2556         char cap_str[10];
2557
2558         /*
2559          * Check that the card supports the command class(es) we need.
2560          */
2561         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2562                 return -ENODEV;
2563
2564         mmc_fixup_device(card, blk_fixups);
2565
2566         md = mmc_blk_alloc(card);
2567         if (IS_ERR(md))
2568                 return PTR_ERR(md);
2569
2570         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2571                         cap_str, sizeof(cap_str));
2572         pr_info("%s: %s %s %s %s\n",
2573                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2574                 cap_str, md->read_only ? "(ro)" : "");
2575
2576         if (mmc_blk_alloc_parts(card, md))
2577                 goto out;
2578
2579         dev_set_drvdata(&card->dev, md);
2580
2581         if (mmc_add_disk(md))
2582                 goto out;
2583
2584         list_for_each_entry(part_md, &md->part, part) {
2585                 if (mmc_add_disk(part_md))
2586                         goto out;
2587         }
2588
2589         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2590         pm_runtime_use_autosuspend(&card->dev);
2591
2592         /*
2593          * Don't enable runtime PM for SD-combo cards here. Leave that
2594          * decision to be taken during the SDIO init sequence instead.
2595          */
2596         if (card->type != MMC_TYPE_SD_COMBO) {
2597                 pm_runtime_set_active(&card->dev);
2598                 pm_runtime_enable(&card->dev);
2599         }
2600
2601         return 0;
2602
2603  out:
2604         mmc_blk_remove_parts(card, md);
2605         mmc_blk_remove_req(md);
2606         return 0;
2607 }
2608
2609 static void mmc_blk_remove(struct mmc_card *card)
2610 {
2611         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2612
2613         mmc_blk_remove_parts(card, md);
2614         pm_runtime_get_sync(&card->dev);
2615         mmc_claim_host(card->host);
2616         mmc_blk_part_switch(card, md);
2617         mmc_release_host(card->host);
2618         if (card->type != MMC_TYPE_SD_COMBO)
2619                 pm_runtime_disable(&card->dev);
2620         pm_runtime_put_noidle(&card->dev);
2621         mmc_blk_remove_req(md);
2622         dev_set_drvdata(&card->dev, NULL);
2623 }
2624
2625 static int _mmc_blk_suspend(struct mmc_card *card)
2626 {
2627         struct mmc_blk_data *part_md;
2628         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2629
2630         if (md) {
2631                 mmc_queue_suspend(&md->queue);
2632                 list_for_each_entry(part_md, &md->part, part) {
2633                         mmc_queue_suspend(&part_md->queue);
2634                 }
2635         }
2636         return 0;
2637 }
2638
2639 static void mmc_blk_shutdown(struct mmc_card *card)
2640 {
2641         _mmc_blk_suspend(card);
2642 }
2643
2644 #ifdef CONFIG_PM_SLEEP
2645 static int mmc_blk_suspend(struct device *dev)
2646 {
2647         struct mmc_card *card = mmc_dev_to_card(dev);
2648
2649         return _mmc_blk_suspend(card);
2650 }
2651
2652 static int mmc_blk_resume(struct device *dev)
2653 {
2654         struct mmc_blk_data *part_md;
2655         struct mmc_blk_data *md = dev_get_drvdata(dev);
2656
2657         if (md) {
2658                 /*
2659                  * Resume involves the card going into idle state,
2660                  * so current partition is always the main one.
2661                  */
2662                 md->part_curr = md->part_type;
2663                 mmc_queue_resume(&md->queue);
2664                 list_for_each_entry(part_md, &md->part, part) {
2665                         mmc_queue_resume(&part_md->queue);
2666                 }
2667         }
2668         return 0;
2669 }
2670 #endif
2671
2672 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2673
2674 static struct mmc_driver mmc_driver = {
2675         .drv            = {
2676                 .name   = "mmcblk",
2677                 .pm     = &mmc_blk_pm_ops,
2678         },
2679         .probe          = mmc_blk_probe,
2680         .remove         = mmc_blk_remove,
2681         .shutdown       = mmc_blk_shutdown,
2682 };
2683
2684 static int __init mmc_blk_init(void)
2685 {
2686         int res;
2687
2688         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2689                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2690
2691         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2692
2693         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2694         if (res)
2695                 goto out;
2696
2697         res = mmc_register_driver(&mmc_driver);
2698         if (res)
2699                 goto out2;
2700
2701         return 0;
2702  out2:
2703         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2704  out:
2705         return res;
2706 }
2707
2708 static void __exit mmc_blk_exit(void)
2709 {
2710         mmc_unregister_driver(&mmc_driver);
2711         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2712 }
2713
2714 module_init(mmc_blk_init);
2715 module_exit(mmc_blk_exit);
2716
2717 MODULE_LICENSE("GPL");
2718 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2719