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