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 #include <linux/idr.h>
  39
  40 #include <linux/mmc/ioctl.h>
  41 #include <linux/mmc/card.h>
  42 #include <linux/mmc/host.h>
  43 #include <linux/mmc/mmc.h>
  44 #include <linux/mmc/sd.h>
  45
  46 #include <asm/uaccess.h>
  47
  48 #include "queue.h"
  49
  50 MODULE_ALIAS("mmc:block");
  51 #ifdef MODULE_PARAM_PREFIX
  52 #undef MODULE_PARAM_PREFIX
  53 #endif
  54 #define MODULE_PARAM_PREFIX "mmcblk."
  55
  56 #define INAND_CMD38_ARG_EXT_CSD  113
  57 #define INAND_CMD38_ARG_ERASE    0x00
  58 #define INAND_CMD38_ARG_TRIM     0x01
  59 #define INAND_CMD38_ARG_SECERASE 0x80
  60 #define INAND_CMD38_ARG_SECTRIM1 0x81
  61 #define INAND_CMD38_ARG_SECTRIM2 0x88
  62 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  63 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  64 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  65
  66 #define mmc_req_rel_wr(req)     ((req->cmd_flags & REQ_FUA) && \
  67                                   (rq_data_dir(req) == WRITE))
  68 #define PACKED_CMD_VER  0x01
  69 #define PACKED_CMD_WR   0x02
  70
  71 static DEFINE_MUTEX(block_mutex);
  72
  73 /*
  74  * The defaults come from config options but can be overriden by module
  75  * or bootarg options.
  76  */
  77 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  78
  79 /*
  80  * We've only got one major, so number of mmcblk devices is
  81  * limited to (1 << 20) / number of minors per device.  It is also
  82  * limited by the MAX_DEVICES below.
  83  */
  84 static int max_devices;
  85
  86 #define MAX_DEVICES 256
  87
  88 static DEFINE_IDA(mmc_blk_ida);
  89 static DEFINE_SPINLOCK(mmc_blk_lock);
  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    reset_done;
 109 #define MMC_BLK_READ            BIT(0)
 110 #define MMC_BLK_WRITE           BIT(1)
 111 #define MMC_BLK_DISCARD         BIT(2)
 112 #define MMC_BLK_SECDISCARD      BIT(3)
 113
 114         /*
 115          * Only set in main mmc_blk_data associated
 116          * with mmc_card with dev_set_drvdata, and keeps
 117          * track of the current selected device partition.
 118          */
 119         unsigned int    part_curr;
 120         struct device_attribute force_ro;
 121         struct device_attribute power_ro_lock;
 122         int     area_type;
 123 };
 124
 125 static DEFINE_MUTEX(open_lock);
 126
 127 enum {
 128         MMC_PACKED_NR_IDX = -1,
 129         MMC_PACKED_NR_ZERO,
 130         MMC_PACKED_NR_SINGLE,
 131 };
 132
 133 module_param(perdev_minors, int, 0444);
 134 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 135
 136 static inline int mmc_blk_part_switch(struct mmc_card *card,
 137                                       struct mmc_blk_data *md);
 138 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 139
 140 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 141 {
 142         struct mmc_packed *packed = mqrq->packed;
 143
 144         BUG_ON(!packed);
 145
 146         mqrq->cmd_type = MMC_PACKED_NONE;
 147         packed->nr_entries = MMC_PACKED_NR_ZERO;
 148         packed->idx_failure = MMC_PACKED_NR_IDX;
 149         packed->retries = 0;
 150         packed->blocks = 0;
 151 }
 152
 153 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 154 {
 155         struct mmc_blk_data *md;
 156
 157         mutex_lock(&open_lock);
 158         md = disk->private_data;
 159         if (md && md->usage == 0)
 160                 md = NULL;
 161         if (md)
 162                 md->usage++;
 163         mutex_unlock(&open_lock);
 164
 165         return md;
 166 }
 167
 168 static inline int mmc_get_devidx(struct gendisk *disk)
 169 {
 170         int devidx = disk->first_minor / perdev_minors;
 171         return devidx;
 172 }
 173
 174 static void mmc_blk_put(struct mmc_blk_data *md)
 175 {
 176         mutex_lock(&open_lock);
 177         md->usage--;
 178         if (md->usage == 0) {
 179                 int devidx = mmc_get_devidx(md->disk);
 180                 blk_cleanup_queue(md->queue.queue);
 181
 182                 spin_lock(&mmc_blk_lock);
 183                 ida_remove(&mmc_blk_ida, devidx);
 184                 spin_unlock(&mmc_blk_lock);
 185
 186                 put_disk(md->disk);
 187                 kfree(md);
 188         }
 189         mutex_unlock(&open_lock);
 190 }
 191
 192 static ssize_t power_ro_lock_show(struct device *dev,
 193                 struct device_attribute *attr, char *buf)
 194 {
 195         int ret;
 196         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 197         struct mmc_card *card = md->queue.card;
 198         int locked = 0;
 199
 200         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 201                 locked = 2;
 202         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 203                 locked = 1;
 204
 205         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 206
 207         mmc_blk_put(md);
 208
 209         return ret;
 210 }
 211
 212 static ssize_t power_ro_lock_store(struct device *dev,
 213                 struct device_attribute *attr, const char *buf, size_t count)
 214 {
 215         int ret;
 216         struct mmc_blk_data *md, *part_md;
 217         struct mmc_card *card;
 218         unsigned long set;
 219
 220         if (kstrtoul(buf, 0, &set))
 221                 return -EINVAL;
 222
 223         if (set != 1)
 224                 return count;
 225
 226         md = mmc_blk_get(dev_to_disk(dev));
 227         card = md->queue.card;
 228
 229         mmc_get_card(card);
 230
 231         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 232                                 card->ext_csd.boot_ro_lock |
 233                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 234                                 card->ext_csd.part_time);
 235         if (ret)
 236                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 237         else
 238                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 239
 240         mmc_put_card(card);
 241
 242         if (!ret) {
 243                 pr_info("%s: Locking boot partition ro until next power on\n",
 244                         md->disk->disk_name);
 245                 set_disk_ro(md->disk, 1);
 246
 247                 list_for_each_entry(part_md, &md->part, part)
 248                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 249                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 250                                 set_disk_ro(part_md->disk, 1);
 251                         }
 252         }
 253
 254         mmc_blk_put(md);
 255         return count;
 256 }
 257
 258 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 259                              char *buf)
 260 {
 261         int ret;
 262         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 263
 264         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 265                        get_disk_ro(dev_to_disk(dev)) ^
 266                        md->read_only);
 267         mmc_blk_put(md);
 268         return ret;
 269 }
 270
 271 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 272                               const char *buf, size_t count)
 273 {
 274         int ret;
 275         char *end;
 276         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 277         unsigned long set = simple_strtoul(buf, &end, 0);
 278         if (end == buf) {
 279                 ret = -EINVAL;
 280                 goto out;
 281         }
 282
 283         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 284         ret = count;
 285 out:
 286         mmc_blk_put(md);
 287         return ret;
 288 }
 289
 290 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 291 {
 292         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 293         int ret = -ENXIO;
 294
 295         mutex_lock(&block_mutex);
 296         if (md) {
 297                 if (md->usage == 2)
 298                         check_disk_change(bdev);
 299                 ret = 0;
 300
 301                 if ((mode & FMODE_WRITE) && md->read_only) {
 302                         mmc_blk_put(md);
 303                         ret = -EROFS;
 304                 }
 305         }
 306         mutex_unlock(&block_mutex);
 307
 308         return ret;
 309 }
 310
 311 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 312 {
 313         struct mmc_blk_data *md = disk->private_data;
 314
 315         mutex_lock(&block_mutex);
 316         mmc_blk_put(md);
 317         mutex_unlock(&block_mutex);
 318 }
 319
 320 static int
 321 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 322 {
 323         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 324         geo->heads = 4;
 325         geo->sectors = 16;
 326         return 0;
 327 }
 328
 329 struct mmc_blk_ioc_data {
 330         struct mmc_ioc_cmd ic;
 331         unsigned char *buf;
 332         u64 buf_bytes;
 333 };
 334
 335 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 336         struct mmc_ioc_cmd __user *user)
 337 {
 338         struct mmc_blk_ioc_data *idata;
 339         int err;
 340
 341         idata = kmalloc(sizeof(*idata), GFP_KERNEL);
 342         if (!idata) {
 343                 err = -ENOMEM;
 344                 goto out;
 345         }
 346
 347         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 348                 err = -EFAULT;
 349                 goto idata_err;
 350         }
 351
 352         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 353         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 354                 err = -EOVERFLOW;
 355                 goto idata_err;
 356         }
 357
 358         if (!idata->buf_bytes)
 359                 return idata;
 360
 361         idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
 362         if (!idata->buf) {
 363                 err = -ENOMEM;
 364                 goto idata_err;
 365         }
 366
 367         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 368                                         idata->ic.data_ptr, idata->buf_bytes)) {
 369                 err = -EFAULT;
 370                 goto copy_err;
 371         }
 372
 373         return idata;
 374
 375 copy_err:
 376         kfree(idata->buf);
 377 idata_err:
 378         kfree(idata);
 379 out:
 380         return ERR_PTR(err);
 381 }
 382
 383 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
 384                                       struct mmc_blk_ioc_data *idata)
 385 {
 386         struct mmc_ioc_cmd *ic = &idata->ic;
 387
 388         if (copy_to_user(&(ic_ptr->response), ic->response,
 389                          sizeof(ic->response)))
 390                 return -EFAULT;
 391
 392         if (!idata->ic.write_flag) {
 393                 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
 394                                  idata->buf, idata->buf_bytes))
 395                         return -EFAULT;
 396         }
 397
 398         return 0;
 399 }
 400
 401 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 402                                        u32 retries_max)
 403 {
 404         int err;
 405         u32 retry_count = 0;
 406
 407         if (!status || !retries_max)
 408                 return -EINVAL;
 409
 410         do {
 411                 err = get_card_status(card, status, 5);
 412                 if (err)
 413                         break;
 414
 415                 if (!R1_STATUS(*status) &&
 416                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 417                         break; /* RPMB programming operation complete */
 418
 419                 /*
 420                  * Rechedule to give the MMC device a chance to continue
 421                  * processing the previous command without being polled too
 422                  * frequently.
 423                  */
 424                 usleep_range(1000, 5000);
 425         } while (++retry_count < retries_max);
 426
 427         if (retry_count == retries_max)
 428                 err = -EPERM;
 429
 430         return err;
 431 }
 432
 433 static int ioctl_do_sanitize(struct mmc_card *card)
 434 {
 435         int err;
 436
 437         if (!mmc_can_sanitize(card)) {
 438                         pr_warn("%s: %s - SANITIZE is not supported\n",
 439                                 mmc_hostname(card->host), __func__);
 440                         err = -EOPNOTSUPP;
 441                         goto out;
 442         }
 443
 444         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 445                 mmc_hostname(card->host), __func__);
 446
 447         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 448                                         EXT_CSD_SANITIZE_START, 1,
 449                                         MMC_SANITIZE_REQ_TIMEOUT);
 450
 451         if (err)
 452                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 453                        mmc_hostname(card->host), __func__, err);
 454
 455         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 456                                              __func__);
 457 out:
 458         return err;
 459 }
 460
 461 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 462                                struct mmc_blk_ioc_data *idata)
 463 {
 464         struct mmc_command cmd = {0};
 465         struct mmc_data data = {0};
 466         struct mmc_request mrq = {NULL};
 467         struct scatterlist sg;
 468         int err;
 469         int is_rpmb = false;
 470         u32 status = 0;
 471
 472         if (!card || !md || !idata)
 473                 return -EINVAL;
 474
 475         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 476                 is_rpmb = true;
 477
 478         cmd.opcode = idata->ic.opcode;
 479         cmd.arg = idata->ic.arg;
 480         cmd.flags = idata->ic.flags;
 481
 482         if (idata->buf_bytes) {
 483                 data.sg = &sg;
 484                 data.sg_len = 1;
 485                 data.blksz = idata->ic.blksz;
 486                 data.blocks = idata->ic.blocks;
 487
 488                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 489
 490                 if (idata->ic.write_flag)
 491                         data.flags = MMC_DATA_WRITE;
 492                 else
 493                         data.flags = MMC_DATA_READ;
 494
 495                 /* data.flags must already be set before doing this. */
 496                 mmc_set_data_timeout(&data, card);
 497
 498                 /* Allow overriding the timeout_ns for empirical tuning. */
 499                 if (idata->ic.data_timeout_ns)
 500                         data.timeout_ns = idata->ic.data_timeout_ns;
 501
 502                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 503                         /*
 504                          * Pretend this is a data transfer and rely on the
 505                          * host driver to compute timeout.  When all host
 506                          * drivers support cmd.cmd_timeout for R1B, this
 507                          * can be changed to:
 508                          *
 509                          *     mrq.data = NULL;
 510                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 511                          */
 512                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 513                 }
 514
 515                 mrq.data = &data;
 516         }
 517
 518         mrq.cmd = &cmd;
 519
 520         err = mmc_blk_part_switch(card, md);
 521         if (err)
 522                 return err;
 523
 524         if (idata->ic.is_acmd) {
 525                 err = mmc_app_cmd(card->host, card);
 526                 if (err)
 527                         return err;
 528         }
 529
 530         if (is_rpmb) {
 531                 err = mmc_set_blockcount(card, data.blocks,
 532                         idata->ic.write_flag & (1 << 31));
 533                 if (err)
 534                         return err;
 535         }
 536
 537         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 538             (cmd.opcode == MMC_SWITCH)) {
 539                 err = ioctl_do_sanitize(card);
 540
 541                 if (err)
 542                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 543                                __func__, err);
 544
 545                 return err;
 546         }
 547
 548         mmc_wait_for_req(card->host, &mrq);
 549
 550         if (cmd.error) {
 551                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 552                                                 __func__, cmd.error);
 553                 return cmd.error;
 554         }
 555         if (data.error) {
 556                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 557                                                 __func__, data.error);
 558                 return data.error;
 559         }
 560
 561         /*
 562          * According to the SD specs, some commands require a delay after
 563          * issuing the command.
 564          */
 565         if (idata->ic.postsleep_min_us)
 566                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 567
 568         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
 569
 570         if (is_rpmb) {
 571                 /*
 572                  * Ensure RPMB command has completed by polling CMD13
 573                  * "Send Status".
 574                  */
 575                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 576                 if (err)
 577                         dev_err(mmc_dev(card->host),
 578                                         "%s: Card Status=0x%08X, error %d\n",
 579                                         __func__, status, err);
 580         }
 581
 582         return err;
 583 }
 584
 585 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 586                              struct mmc_ioc_cmd __user *ic_ptr)
 587 {
 588         struct mmc_blk_ioc_data *idata;
 589         struct mmc_blk_data *md;
 590         struct mmc_card *card;
 591         int err = 0, ioc_err = 0;
 592
 593         /*
 594          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 595          * whole block device, not on a partition.  This prevents overspray
 596          * between sibling partitions.
 597          */
 598         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 599                 return -EPERM;
 600
 601         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 602         if (IS_ERR(idata))
 603                 return PTR_ERR(idata);
 604
 605         md = mmc_blk_get(bdev->bd_disk);
 606         if (!md) {
 607                 err = -EINVAL;
 608                 goto cmd_err;
 609         }
 610
 611         card = md->queue.card;
 612         if (IS_ERR(card)) {
 613                 err = PTR_ERR(card);
 614                 goto cmd_done;
 615         }
 616
 617         mmc_get_card(card);
 618
 619         ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
 620
 621         mmc_put_card(card);
 622
 623         err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
 624
 625 cmd_done:
 626         mmc_blk_put(md);
 627 cmd_err:
 628         kfree(idata->buf);
 629         kfree(idata);
 630         return ioc_err ? ioc_err : err;
 631 }
 632
 633 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 634                                    struct mmc_ioc_multi_cmd __user *user)
 635 {
 636         struct mmc_blk_ioc_data **idata = NULL;
 637         struct mmc_ioc_cmd __user *cmds = user->cmds;
 638         struct mmc_card *card;
 639         struct mmc_blk_data *md;
 640         int i, err = 0, ioc_err = 0;
 641         __u64 num_of_cmds;
 642
 643         /*
 644          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 645          * whole block device, not on a partition.  This prevents overspray
 646          * between sibling partitions.
 647          */
 648         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 649                 return -EPERM;
 650
 651         if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
 652                            sizeof(num_of_cmds)))
 653                 return -EFAULT;
 654
 655         if (num_of_cmds > MMC_IOC_MAX_CMDS)
 656                 return -EINVAL;
 657
 658         idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
 659         if (!idata)
 660                 return -ENOMEM;
 661
 662         for (i = 0; i < num_of_cmds; i++) {
 663                 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
 664                 if (IS_ERR(idata[i])) {
 665                         err = PTR_ERR(idata[i]);
 666                         num_of_cmds = i;
 667                         goto cmd_err;
 668                 }
 669         }
 670
 671         md = mmc_blk_get(bdev->bd_disk);
 672         if (!md) {
 673                 err = -EINVAL;
 674                 goto cmd_err;
 675         }
 676
 677         card = md->queue.card;
 678         if (IS_ERR(card)) {
 679                 err = PTR_ERR(card);
 680                 goto cmd_done;
 681         }
 682
 683         mmc_get_card(card);
 684
 685         for (i = 0; i < num_of_cmds && !ioc_err; i++)
 686                 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 687
 688         mmc_put_card(card);
 689
 690         /* copy to user if data and response */
 691         for (i = 0; i < num_of_cmds && !err; i++)
 692                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 693
 694 cmd_done:
 695         mmc_blk_put(md);
 696 cmd_err:
 697         for (i = 0; i < num_of_cmds; i++) {
 698                 kfree(idata[i]->buf);
 699                 kfree(idata[i]);
 700         }
 701         kfree(idata);
 702         return ioc_err ? ioc_err : err;
 703 }
 704
 705 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 706         unsigned int cmd, unsigned long arg)
 707 {
 708         switch (cmd) {
 709         case MMC_IOC_CMD:
 710                 return mmc_blk_ioctl_cmd(bdev,
 711                                 (struct mmc_ioc_cmd __user *)arg);
 712         case MMC_IOC_MULTI_CMD:
 713                 return mmc_blk_ioctl_multi_cmd(bdev,
 714                                 (struct mmc_ioc_multi_cmd __user *)arg);
 715         default:
 716                 return -EINVAL;
 717         }
 718 }
 719
 720 #ifdef CONFIG_COMPAT
 721 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 722         unsigned int cmd, unsigned long arg)
 723 {
 724         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 725 }
 726 #endif
 727
 728 static const struct block_device_operations mmc_bdops = {
 729         .open                   = mmc_blk_open,
 730         .release                = mmc_blk_release,
 731         .getgeo                 = mmc_blk_getgeo,
 732         .owner                  = THIS_MODULE,
 733         .ioctl                  = mmc_blk_ioctl,
 734 #ifdef CONFIG_COMPAT
 735         .compat_ioctl           = mmc_blk_compat_ioctl,
 736 #endif
 737 };
 738
 739 static inline int mmc_blk_part_switch(struct mmc_card *card,
 740                                       struct mmc_blk_data *md)
 741 {
 742         int ret;
 743         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 744
 745         if (main_md->part_curr == md->part_type)
 746                 return 0;
 747
 748         if (mmc_card_mmc(card)) {
 749                 u8 part_config = card->ext_csd.part_config;
 750
 751                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 752                 part_config |= md->part_type;
 753
 754                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 755                                  EXT_CSD_PART_CONFIG, part_config,
 756                                  card->ext_csd.part_time);
 757                 if (ret)
 758                         return ret;
 759
 760                 card->ext_csd.part_config = part_config;
 761         }
 762
 763         main_md->part_curr = md->part_type;
 764         return 0;
 765 }
 766
 767 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 768 {
 769         int err;
 770         u32 result;
 771         __be32 *blocks;
 772
 773         struct mmc_request mrq = {NULL};
 774         struct mmc_command cmd = {0};
 775         struct mmc_data data = {0};
 776
 777         struct scatterlist sg;
 778
 779         cmd.opcode = MMC_APP_CMD;
 780         cmd.arg = card->rca << 16;
 781         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 782
 783         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 784         if (err)
 785                 return (u32)-1;
 786         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 787                 return (u32)-1;
 788
 789         memset(&cmd, 0, sizeof(struct mmc_command));
 790
 791         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 792         cmd.arg = 0;
 793         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 794
 795         data.blksz = 4;
 796         data.blocks = 1;
 797         data.flags = MMC_DATA_READ;
 798         data.sg = &sg;
 799         data.sg_len = 1;
 800         mmc_set_data_timeout(&data, card);
 801
 802         mrq.cmd = &cmd;
 803         mrq.data = &data;
 804
 805         blocks = kmalloc(4, GFP_KERNEL);
 806         if (!blocks)
 807                 return (u32)-1;
 808
 809         sg_init_one(&sg, blocks, 4);
 810
 811         mmc_wait_for_req(card->host, &mrq);
 812
 813         result = ntohl(*blocks);
 814         kfree(blocks);
 815
 816         if (cmd.error || data.error)
 817                 result = (u32)-1;
 818
 819         return result;
 820 }
 821
 822 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 823 {
 824         struct mmc_command cmd = {0};
 825         int err;
 826
 827         cmd.opcode = MMC_SEND_STATUS;
 828         if (!mmc_host_is_spi(card->host))
 829                 cmd.arg = card->rca << 16;
 830         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 831         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 832         if (err == 0)
 833                 *status = cmd.resp[0];
 834         return err;
 835 }
 836
 837 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 838                 bool hw_busy_detect, struct request *req, int *gen_err)
 839 {
 840         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 841         int err = 0;
 842         u32 status;
 843
 844         do {
 845                 err = get_card_status(card, &status, 5);
 846                 if (err) {
 847                         pr_err("%s: error %d requesting status\n",
 848                                req->rq_disk->disk_name, err);
 849                         return err;
 850                 }
 851
 852                 if (status & R1_ERROR) {
 853                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 854                                 req->rq_disk->disk_name, __func__, status);
 855                         *gen_err = 1;
 856                 }
 857
 858                 /* We may rely on the host hw to handle busy detection.*/
 859                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 860                         hw_busy_detect)
 861                         break;
 862
 863                 /*
 864                  * Timeout if the device never becomes ready for data and never
 865                  * leaves the program state.
 866                  */
 867                 if (time_after(jiffies, timeout)) {
 868                         pr_err("%s: Card stuck in programming state! %s %s\n",
 869                                 mmc_hostname(card->host),
 870                                 req->rq_disk->disk_name, __func__);
 871                         return -ETIMEDOUT;
 872                 }
 873
 874                 /*
 875                  * Some cards mishandle the status bits,
 876                  * so make sure to check both the busy
 877                  * indication and the card state.
 878                  */
 879         } while (!(status & R1_READY_FOR_DATA) ||
 880                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 881
 882         return err;
 883 }
 884
 885 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 886                 struct request *req, int *gen_err, u32 *stop_status)
 887 {
 888         struct mmc_host *host = card->host;
 889         struct mmc_command cmd = {0};
 890         int err;
 891         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 892
 893         /*
 894          * Normally we use R1B responses for WRITE, but in cases where the host
 895          * has specified a max_busy_timeout we need to validate it. A failure
 896          * means we need to prevent the host from doing hw busy detection, which
 897          * is done by converting to a R1 response instead.
 898          */
 899         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 900                 use_r1b_resp = false;
 901
 902         cmd.opcode = MMC_STOP_TRANSMISSION;
 903         if (use_r1b_resp) {
 904                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 905                 cmd.busy_timeout = timeout_ms;
 906         } else {
 907                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 908         }
 909
 910         err = mmc_wait_for_cmd(host, &cmd, 5);
 911         if (err)
 912                 return err;
 913
 914         *stop_status = cmd.resp[0];
 915
 916         /* No need to check card status in case of READ. */
 917         if (rq_data_dir(req) == READ)
 918                 return 0;
 919
 920         if (!mmc_host_is_spi(host) &&
 921                 (*stop_status & R1_ERROR)) {
 922                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 923                         req->rq_disk->disk_name, __func__, *stop_status);
 924                 *gen_err = 1;
 925         }
 926
 927         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 928 }
 929
 930 #define ERR_NOMEDIUM    3
 931 #define ERR_RETRY       2
 932 #define ERR_ABORT       1
 933 #define ERR_CONTINUE    0
 934
 935 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 936         bool status_valid, u32 status)
 937 {
 938         switch (error) {
 939         case -EILSEQ:
 940                 /* response crc error, retry the r/w cmd */
 941                 pr_err("%s: %s sending %s command, card status %#x\n",
 942                         req->rq_disk->disk_name, "response CRC error",
 943                         name, status);
 944                 return ERR_RETRY;
 945
 946         case -ETIMEDOUT:
 947                 pr_err("%s: %s sending %s command, card status %#x\n",
 948                         req->rq_disk->disk_name, "timed out", name, status);
 949
 950                 /* If the status cmd initially failed, retry the r/w cmd */
 951                 if (!status_valid) {
 952                         pr_err("%s: status not valid, retrying timeout\n",
 953                                 req->rq_disk->disk_name);
 954                         return ERR_RETRY;
 955                 }
 956
 957                 /*
 958                  * If it was a r/w cmd crc error, or illegal command
 959                  * (eg, issued in wrong state) then retry - we should
 960                  * have corrected the state problem above.
 961                  */
 962                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
 963                         pr_err("%s: command error, retrying timeout\n",
 964                                 req->rq_disk->disk_name);
 965                         return ERR_RETRY;
 966                 }
 967
 968                 /* Otherwise abort the command */
 969                 return ERR_ABORT;
 970
 971         default:
 972                 /* We don't understand the error code the driver gave us */
 973                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 974                        req->rq_disk->disk_name, error, status);
 975                 return ERR_ABORT;
 976         }
 977 }
 978
 979 /*
 980  * Initial r/w and stop cmd error recovery.
 981  * We don't know whether the card received the r/w cmd or not, so try to
 982  * restore things back to a sane state.  Essentially, we do this as follows:
 983  * - Obtain card status.  If the first attempt to obtain card status fails,
 984  *   the status word will reflect the failed status cmd, not the failed
 985  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 986  *   longer communicate with the card.
 987  * - Check the card state.  If the card received the cmd but there was a
 988  *   transient problem with the response, it might still be in a data transfer
 989  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 990  * - If the r/w cmd failed due to a response CRC error, it was probably
 991  *   transient, so retry the cmd.
 992  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 993  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 994  *   illegal cmd, retry.
 995  * Otherwise we don't understand what happened, so abort.
 996  */
 997 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 998         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
 999 {
1000         bool prev_cmd_status_valid = true;
1001         u32 status, stop_status = 0;
1002         int err, retry;
1003
1004         if (mmc_card_removed(card))
1005                 return ERR_NOMEDIUM;
1006
1007         /*
1008          * Try to get card status which indicates both the card state
1009          * and why there was no response.  If the first attempt fails,
1010          * we can't be sure the returned status is for the r/w command.
1011          */
1012         for (retry = 2; retry >= 0; retry--) {
1013                 err = get_card_status(card, &status, 0);
1014                 if (!err)
1015                         break;
1016
1017                 /* Re-tune if needed */
1018                 mmc_retune_recheck(card->host);
1019
1020                 prev_cmd_status_valid = false;
1021                 pr_err("%s: error %d sending status command, %sing\n",
1022                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1023         }
1024
1025         /* We couldn't get a response from the card.  Give up. */
1026         if (err) {
1027                 /* Check if the card is removed */
1028                 if (mmc_detect_card_removed(card->host))
1029                         return ERR_NOMEDIUM;
1030                 return ERR_ABORT;
1031         }
1032
1033         /* Flag ECC errors */
1034         if ((status & R1_CARD_ECC_FAILED) ||
1035             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1036             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1037                 *ecc_err = 1;
1038
1039         /* Flag General errors */
1040         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1041                 if ((status & R1_ERROR) ||
1042                         (brq->stop.resp[0] & R1_ERROR)) {
1043                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1044                                req->rq_disk->disk_name, __func__,
1045                                brq->stop.resp[0], status);
1046                         *gen_err = 1;
1047                 }
1048
1049         /*
1050          * Check the current card state.  If it is in some data transfer
1051          * mode, tell it to stop (and hopefully transition back to TRAN.)
1052          */
1053         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1054             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1055                 err = send_stop(card,
1056                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1057                         req, gen_err, &stop_status);
1058                 if (err) {
1059                         pr_err("%s: error %d sending stop command\n",
1060                                req->rq_disk->disk_name, err);
1061                         /*
1062                          * If the stop cmd also timed out, the card is probably
1063                          * not present, so abort. Other errors are bad news too.
1064                          */
1065                         return ERR_ABORT;
1066                 }
1067
1068                 if (stop_status & R1_CARD_ECC_FAILED)
1069                         *ecc_err = 1;
1070         }
1071
1072         /* Check for set block count errors */
1073         if (brq->sbc.error)
1074                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1075                                 prev_cmd_status_valid, status);
1076
1077         /* Check for r/w command errors */
1078         if (brq->cmd.error)
1079                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1080                                 prev_cmd_status_valid, status);
1081
1082         /* Data errors */
1083         if (!brq->stop.error)
1084                 return ERR_CONTINUE;
1085
1086         /* Now for stop errors.  These aren't fatal to the transfer. */
1087         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1088                req->rq_disk->disk_name, brq->stop.error,
1089                brq->cmd.resp[0], status);
1090
1091         /*
1092          * Subsitute in our own stop status as this will give the error
1093          * state which happened during the execution of the r/w command.
1094          */
1095         if (stop_status) {
1096                 brq->stop.resp[0] = stop_status;
1097                 brq->stop.error = 0;
1098         }
1099         return ERR_CONTINUE;
1100 }
1101
1102 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1103                          int type)
1104 {
1105         int err;
1106
1107         if (md->reset_done & type)
1108                 return -EEXIST;
1109
1110         md->reset_done |= type;
1111         err = mmc_hw_reset(host);
1112         /* Ensure we switch back to the correct partition */
1113         if (err != -EOPNOTSUPP) {
1114                 struct mmc_blk_data *main_md =
1115                         dev_get_drvdata(&host->card->dev);
1116                 int part_err;
1117
1118                 main_md->part_curr = main_md->part_type;
1119                 part_err = mmc_blk_part_switch(host->card, md);
1120                 if (part_err) {
1121                         /*
1122                          * We have failed to get back into the correct
1123                          * partition, so we need to abort the whole request.
1124                          */
1125                         return -ENODEV;
1126                 }
1127         }
1128         return err;
1129 }
1130
1131 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1132 {
1133         md->reset_done &= ~type;
1134 }
1135
1136 int mmc_access_rpmb(struct mmc_queue *mq)
1137 {
1138         struct mmc_blk_data *md = mq->data;
1139         /*
1140          * If this is a RPMB partition access, return ture
1141          */
1142         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1143                 return true;
1144
1145         return false;
1146 }
1147
1148 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1149 {
1150         struct mmc_blk_data *md = mq->data;
1151         struct mmc_card *card = md->queue.card;
1152         unsigned int from, nr, arg;
1153         int err = 0, type = MMC_BLK_DISCARD;
1154
1155         if (!mmc_can_erase(card)) {
1156                 err = -EOPNOTSUPP;
1157                 goto out;
1158         }
1159
1160         from = blk_rq_pos(req);
1161         nr = blk_rq_sectors(req);
1162
1163         if (mmc_can_discard(card))
1164                 arg = MMC_DISCARD_ARG;
1165         else if (mmc_can_trim(card))
1166                 arg = MMC_TRIM_ARG;
1167         else
1168                 arg = MMC_ERASE_ARG;
1169 retry:
1170         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1171                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1172                                  INAND_CMD38_ARG_EXT_CSD,
1173                                  arg == MMC_TRIM_ARG ?
1174                                  INAND_CMD38_ARG_TRIM :
1175                                  INAND_CMD38_ARG_ERASE,
1176                                  0);
1177                 if (err)
1178                         goto out;
1179         }
1180         err = mmc_erase(card, from, nr, arg);
1181 out:
1182         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1183                 goto retry;
1184         if (!err)
1185                 mmc_blk_reset_success(md, type);
1186         blk_end_request(req, err, blk_rq_bytes(req));
1187
1188         return err ? 0 : 1;
1189 }
1190
1191 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1192                                        struct request *req)
1193 {
1194         struct mmc_blk_data *md = mq->data;
1195         struct mmc_card *card = md->queue.card;
1196         unsigned int from, nr, arg;
1197         int err = 0, type = MMC_BLK_SECDISCARD;
1198
1199         if (!(mmc_can_secure_erase_trim(card))) {
1200                 err = -EOPNOTSUPP;
1201                 goto out;
1202         }
1203
1204         from = blk_rq_pos(req);
1205         nr = blk_rq_sectors(req);
1206
1207         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1208                 arg = MMC_SECURE_TRIM1_ARG;
1209         else
1210                 arg = MMC_SECURE_ERASE_ARG;
1211
1212 retry:
1213         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1214                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1215                                  INAND_CMD38_ARG_EXT_CSD,
1216                                  arg == MMC_SECURE_TRIM1_ARG ?
1217                                  INAND_CMD38_ARG_SECTRIM1 :
1218                                  INAND_CMD38_ARG_SECERASE,
1219                                  0);
1220                 if (err)
1221                         goto out_retry;
1222         }
1223
1224         err = mmc_erase(card, from, nr, arg);
1225         if (err == -EIO)
1226                 goto out_retry;
1227         if (err)
1228                 goto out;
1229
1230         if (arg == MMC_SECURE_TRIM1_ARG) {
1231                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1232                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1233                                          INAND_CMD38_ARG_EXT_CSD,
1234                                          INAND_CMD38_ARG_SECTRIM2,
1235                                          0);
1236                         if (err)
1237                                 goto out_retry;
1238                 }
1239
1240                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1241                 if (err == -EIO)
1242                         goto out_retry;
1243                 if (err)
1244                         goto out;
1245         }
1246
1247 out_retry:
1248         if (err && !mmc_blk_reset(md, card->host, type))
1249                 goto retry;
1250         if (!err)
1251                 mmc_blk_reset_success(md, type);
1252 out:
1253         blk_end_request(req, err, blk_rq_bytes(req));
1254
1255         return err ? 0 : 1;
1256 }
1257
1258 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1259 {
1260         struct mmc_blk_data *md = mq->data;
1261         struct mmc_card *card = md->queue.card;
1262         int ret = 0;
1263
1264         ret = mmc_flush_cache(card);
1265         if (ret)
1266                 ret = -EIO;
1267
1268         blk_end_request_all(req, ret);
1269
1270         return ret ? 0 : 1;
1271 }
1272
1273 /*
1274  * Reformat current write as a reliable write, supporting
1275  * both legacy and the enhanced reliable write MMC cards.
1276  * In each transfer we'll handle only as much as a single
1277  * reliable write can handle, thus finish the request in
1278  * partial completions.
1279  */
1280 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1281                                     struct mmc_card *card,
1282                                     struct request *req)
1283 {
1284         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1285                 /* Legacy mode imposes restrictions on transfers. */
1286                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1287                         brq->data.blocks = 1;
1288
1289                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1290                         brq->data.blocks = card->ext_csd.rel_sectors;
1291                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1292                         brq->data.blocks = 1;
1293         }
1294 }
1295
1296 #define CMD_ERRORS                                                      \
1297         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1298          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1299          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1300          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1301          R1_CC_ERROR |          /* Card controller error */             \
1302          R1_ERROR)              /* General/unknown error */
1303
1304 static int mmc_blk_err_check(struct mmc_card *card,
1305                              struct mmc_async_req *areq)
1306 {
1307         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1308                                                     mmc_active);
1309         struct mmc_blk_request *brq = &mq_mrq->brq;
1310         struct request *req = mq_mrq->req;
1311         int need_retune = card->host->need_retune;
1312         int ecc_err = 0, gen_err = 0;
1313
1314         /*
1315          * sbc.error indicates a problem with the set block count
1316          * command.  No data will have been transferred.
1317          *
1318          * cmd.error indicates a problem with the r/w command.  No
1319          * data will have been transferred.
1320          *
1321          * stop.error indicates a problem with the stop command.  Data
1322          * may have been transferred, or may still be transferring.
1323          */
1324         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1325             brq->data.error) {
1326                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1327                 case ERR_RETRY:
1328                         return MMC_BLK_RETRY;
1329                 case ERR_ABORT:
1330                         return MMC_BLK_ABORT;
1331                 case ERR_NOMEDIUM:
1332                         return MMC_BLK_NOMEDIUM;
1333                 case ERR_CONTINUE:
1334                         break;
1335                 }
1336         }
1337
1338         /*
1339          * Check for errors relating to the execution of the
1340          * initial command - such as address errors.  No data
1341          * has been transferred.
1342          */
1343         if (brq->cmd.resp[0] & CMD_ERRORS) {
1344                 pr_err("%s: r/w command failed, status = %#x\n",
1345                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1346                 return MMC_BLK_ABORT;
1347         }
1348
1349         /*
1350          * Everything else is either success, or a data error of some
1351          * kind.  If it was a write, we may have transitioned to
1352          * program mode, which we have to wait for it to complete.
1353          */
1354         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1355                 int err;
1356
1357                 /* Check stop command response */
1358                 if (brq->stop.resp[0] & R1_ERROR) {
1359                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1360                                req->rq_disk->disk_name, __func__,
1361                                brq->stop.resp[0]);
1362                         gen_err = 1;
1363                 }
1364
1365                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1366                                         &gen_err);
1367                 if (err)
1368                         return MMC_BLK_CMD_ERR;
1369         }
1370
1371         /* if general error occurs, retry the write operation. */
1372         if (gen_err) {
1373                 pr_warn("%s: retrying write for general error\n",
1374                                 req->rq_disk->disk_name);
1375                 return MMC_BLK_RETRY;
1376         }
1377
1378         if (brq->data.error) {
1379                 if (need_retune && !brq->retune_retry_done) {
1380                         pr_debug("%s: retrying because a re-tune was needed\n",
1381                                  req->rq_disk->disk_name);
1382                         brq->retune_retry_done = 1;
1383                         return MMC_BLK_RETRY;
1384                 }
1385                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1386                        req->rq_disk->disk_name, brq->data.error,
1387                        (unsigned)blk_rq_pos(req),
1388                        (unsigned)blk_rq_sectors(req),
1389                        brq->cmd.resp[0], brq->stop.resp[0]);
1390
1391                 if (rq_data_dir(req) == READ) {
1392                         if (ecc_err)
1393                                 return MMC_BLK_ECC_ERR;
1394                         return MMC_BLK_DATA_ERR;
1395                 } else {
1396                         return MMC_BLK_CMD_ERR;
1397                 }
1398         }
1399
1400         if (!brq->data.bytes_xfered)
1401                 return MMC_BLK_RETRY;
1402
1403         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1404                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1405                         return MMC_BLK_PARTIAL;
1406                 else
1407                         return MMC_BLK_SUCCESS;
1408         }
1409
1410         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1411                 return MMC_BLK_PARTIAL;
1412
1413         return MMC_BLK_SUCCESS;
1414 }
1415
1416 static int mmc_blk_packed_err_check(struct mmc_card *card,
1417                                     struct mmc_async_req *areq)
1418 {
1419         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1420                         mmc_active);
1421         struct request *req = mq_rq->req;
1422         struct mmc_packed *packed = mq_rq->packed;
1423         int err, check, status;
1424         u8 *ext_csd;
1425
1426         BUG_ON(!packed);
1427
1428         packed->retries--;
1429         check = mmc_blk_err_check(card, areq);
1430         err = get_card_status(card, &status, 0);
1431         if (err) {
1432                 pr_err("%s: error %d sending status command\n",
1433                        req->rq_disk->disk_name, err);
1434                 return MMC_BLK_ABORT;
1435         }
1436
1437         if (status & R1_EXCEPTION_EVENT) {
1438                 err = mmc_get_ext_csd(card, &ext_csd);
1439                 if (err) {
1440                         pr_err("%s: error %d sending ext_csd\n",
1441                                req->rq_disk->disk_name, err);
1442                         return MMC_BLK_ABORT;
1443                 }
1444
1445                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1446                      EXT_CSD_PACKED_FAILURE) &&
1447                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1448                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1449                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1450                             EXT_CSD_PACKED_INDEXED_ERROR) {
1451                                 packed->idx_failure =
1452                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1453                                 check = MMC_BLK_PARTIAL;
1454                         }
1455                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1456                                "failure index: %d\n",
1457                                req->rq_disk->disk_name, packed->nr_entries,
1458                                packed->blocks, packed->idx_failure);
1459                 }
1460                 kfree(ext_csd);
1461         }
1462
1463         return check;
1464 }
1465
1466 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1467                                struct mmc_card *card,
1468                                int disable_multi,
1469                                struct mmc_queue *mq)
1470 {
1471         u32 readcmd, writecmd;
1472         struct mmc_blk_request *brq = &mqrq->brq;
1473         struct request *req = mqrq->req;
1474         struct mmc_blk_data *md = mq->data;
1475         bool do_data_tag;
1476
1477         /*
1478          * Reliable writes are used to implement Forced Unit Access and
1479          * are supported only on MMCs.
1480          */
1481         bool do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1482                 (rq_data_dir(req) == WRITE) &&
1483                 (md->flags & MMC_BLK_REL_WR);
1484
1485         memset(brq, 0, sizeof(struct mmc_blk_request));
1486         brq->mrq.cmd = &brq->cmd;
1487         brq->mrq.data = &brq->data;
1488
1489         brq->cmd.arg = blk_rq_pos(req);
1490         if (!mmc_card_blockaddr(card))
1491                 brq->cmd.arg <<= 9;
1492         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1493         brq->data.blksz = 512;
1494         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1495         brq->stop.arg = 0;
1496         brq->data.blocks = blk_rq_sectors(req);
1497
1498         /*
1499          * The block layer doesn't support all sector count
1500          * restrictions, so we need to be prepared for too big
1501          * requests.
1502          */
1503         if (brq->data.blocks > card->host->max_blk_count)
1504                 brq->data.blocks = card->host->max_blk_count;
1505
1506         if (brq->data.blocks > 1) {
1507                 /*
1508                  * After a read error, we redo the request one sector
1509                  * at a time in order to accurately determine which
1510                  * sectors can be read successfully.
1511                  */
1512                 if (disable_multi)
1513                         brq->data.blocks = 1;
1514
1515                 /*
1516                  * Some controllers have HW issues while operating
1517                  * in multiple I/O mode
1518                  */
1519                 if (card->host->ops->multi_io_quirk)
1520                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1521                                                 (rq_data_dir(req) == READ) ?
1522                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1523                                                 brq->data.blocks);
1524         }
1525
1526         if (brq->data.blocks > 1 || do_rel_wr) {
1527                 /* SPI multiblock writes terminate using a special
1528                  * token, not a STOP_TRANSMISSION request.
1529                  */
1530                 if (!mmc_host_is_spi(card->host) ||
1531                     rq_data_dir(req) == READ)
1532                         brq->mrq.stop = &brq->stop;
1533                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1534                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1535         } else {
1536                 brq->mrq.stop = NULL;
1537                 readcmd = MMC_READ_SINGLE_BLOCK;
1538                 writecmd = MMC_WRITE_BLOCK;
1539         }
1540         if (rq_data_dir(req) == READ) {
1541                 brq->cmd.opcode = readcmd;
1542                 brq->data.flags = MMC_DATA_READ;
1543                 if (brq->mrq.stop)
1544                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1545                                         MMC_CMD_AC;
1546         } else {
1547                 brq->cmd.opcode = writecmd;
1548                 brq->data.flags = MMC_DATA_WRITE;
1549                 if (brq->mrq.stop)
1550                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1551                                         MMC_CMD_AC;
1552         }
1553
1554         if (do_rel_wr)
1555                 mmc_apply_rel_rw(brq, card, req);
1556
1557         /*
1558          * Data tag is used only during writing meta data to speed
1559          * up write and any subsequent read of this meta data
1560          */
1561         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1562                 (req->cmd_flags & REQ_META) &&
1563                 (rq_data_dir(req) == WRITE) &&
1564                 ((brq->data.blocks * brq->data.blksz) >=
1565                  card->ext_csd.data_tag_unit_size);
1566
1567         /*
1568          * Pre-defined multi-block transfers are preferable to
1569          * open ended-ones (and necessary for reliable writes).
1570          * However, it is not sufficient to just send CMD23,
1571          * and avoid the final CMD12, as on an error condition
1572          * CMD12 (stop) needs to be sent anyway. This, coupled
1573          * with Auto-CMD23 enhancements provided by some
1574          * hosts, means that the complexity of dealing
1575          * with this is best left to the host. If CMD23 is
1576          * supported by card and host, we'll fill sbc in and let
1577          * the host deal with handling it correctly. This means
1578          * that for hosts that don't expose MMC_CAP_CMD23, no
1579          * change of behavior will be observed.
1580          *
1581          * N.B: Some MMC cards experience perf degradation.
1582          * We'll avoid using CMD23-bounded multiblock writes for
1583          * these, while retaining features like reliable writes.
1584          */
1585         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1586             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1587              do_data_tag)) {
1588                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1589                 brq->sbc.arg = brq->data.blocks |
1590                         (do_rel_wr ? (1 << 31) : 0) |
1591                         (do_data_tag ? (1 << 29) : 0);
1592                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1593                 brq->mrq.sbc = &brq->sbc;
1594         }
1595
1596         mmc_set_data_timeout(&brq->data, card);
1597
1598         brq->data.sg = mqrq->sg;
1599         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1600
1601         /*
1602          * Adjust the sg list so it is the same size as the
1603          * request.
1604          */
1605         if (brq->data.blocks != blk_rq_sectors(req)) {
1606                 int i, data_size = brq->data.blocks << 9;
1607                 struct scatterlist *sg;
1608
1609                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1610                         data_size -= sg->length;
1611                         if (data_size <= 0) {
1612                                 sg->length += data_size;
1613                                 i++;
1614                                 break;
1615                         }
1616                 }
1617                 brq->data.sg_len = i;
1618         }
1619
1620         mqrq->mmc_active.mrq = &brq->mrq;
1621         mqrq->mmc_active.err_check = mmc_blk_err_check;
1622
1623         mmc_queue_bounce_pre(mqrq);
1624 }
1625
1626 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1627                                           struct mmc_card *card)
1628 {
1629         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1630         unsigned int max_seg_sz = queue_max_segment_size(q);
1631         unsigned int len, nr_segs = 0;
1632
1633         do {
1634                 len = min(hdr_sz, max_seg_sz);
1635                 hdr_sz -= len;
1636                 nr_segs++;
1637         } while (hdr_sz);
1638
1639         return nr_segs;
1640 }
1641
1642 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1643 {
1644         struct request_queue *q = mq->queue;
1645         struct mmc_card *card = mq->card;
1646         struct request *cur = req, *next = NULL;
1647         struct mmc_blk_data *md = mq->data;
1648         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1649         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1650         unsigned int req_sectors = 0, phys_segments = 0;
1651         unsigned int max_blk_count, max_phys_segs;
1652         bool put_back = true;
1653         u8 max_packed_rw = 0;
1654         u8 reqs = 0;
1655
1656         if (!(md->flags & MMC_BLK_PACKED_CMD))
1657                 goto no_packed;
1658
1659         if ((rq_data_dir(cur) == WRITE) &&
1660             mmc_host_packed_wr(card->host))
1661                 max_packed_rw = card->ext_csd.max_packed_writes;
1662
1663         if (max_packed_rw == 0)
1664                 goto no_packed;
1665
1666         if (mmc_req_rel_wr(cur) &&
1667             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1668                 goto no_packed;
1669
1670         if (mmc_large_sector(card) &&
1671             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1672                 goto no_packed;
1673
1674         mmc_blk_clear_packed(mqrq);
1675
1676         max_blk_count = min(card->host->max_blk_count,
1677                             card->host->max_req_size >> 9);
1678         if (unlikely(max_blk_count > 0xffff))
1679                 max_blk_count = 0xffff;
1680
1681         max_phys_segs = queue_max_segments(q);
1682         req_sectors += blk_rq_sectors(cur);
1683         phys_segments += cur->nr_phys_segments;
1684
1685         if (rq_data_dir(cur) == WRITE) {
1686                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1687                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1688         }
1689
1690         do {
1691                 if (reqs >= max_packed_rw - 1) {
1692                         put_back = false;
1693                         break;
1694                 }
1695
1696                 spin_lock_irq(q->queue_lock);
1697                 next = blk_fetch_request(q);
1698                 spin_unlock_irq(q->queue_lock);
1699                 if (!next) {
1700                         put_back = false;
1701                         break;
1702                 }
1703
1704                 if (mmc_large_sector(card) &&
1705                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1706                         break;
1707
1708                 if (next->cmd_flags & REQ_DISCARD ||
1709                     next->cmd_flags & REQ_FLUSH)
1710                         break;
1711
1712                 if (rq_data_dir(cur) != rq_data_dir(next))
1713                         break;
1714
1715                 if (mmc_req_rel_wr(next) &&
1716                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1717                         break;
1718
1719                 req_sectors += blk_rq_sectors(next);
1720                 if (req_sectors > max_blk_count)
1721                         break;
1722
1723                 phys_segments +=  next->nr_phys_segments;
1724                 if (phys_segments > max_phys_segs)
1725                         break;
1726
1727                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1728                 cur = next;
1729                 reqs++;
1730         } while (1);
1731
1732         if (put_back) {
1733                 spin_lock_irq(q->queue_lock);
1734                 blk_requeue_request(q, next);
1735                 spin_unlock_irq(q->queue_lock);
1736         }
1737
1738         if (reqs > 0) {
1739                 list_add(&req->queuelist, &mqrq->packed->list);
1740                 mqrq->packed->nr_entries = ++reqs;
1741                 mqrq->packed->retries = reqs;
1742                 return reqs;
1743         }
1744
1745 no_packed:
1746         mqrq->cmd_type = MMC_PACKED_NONE;
1747         return 0;
1748 }
1749
1750 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1751                                         struct mmc_card *card,
1752                                         struct mmc_queue *mq)
1753 {
1754         struct mmc_blk_request *brq = &mqrq->brq;
1755         struct request *req = mqrq->req;
1756         struct request *prq;
1757         struct mmc_blk_data *md = mq->data;
1758         struct mmc_packed *packed = mqrq->packed;
1759         bool do_rel_wr, do_data_tag;
1760         u32 *packed_cmd_hdr;
1761         u8 hdr_blocks;
1762         u8 i = 1;
1763
1764         BUG_ON(!packed);
1765
1766         mqrq->cmd_type = MMC_PACKED_WRITE;
1767         packed->blocks = 0;
1768         packed->idx_failure = MMC_PACKED_NR_IDX;
1769
1770         packed_cmd_hdr = packed->cmd_hdr;
1771         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1772         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1773                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1774         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1775
1776         /*
1777          * Argument for each entry of packed group
1778          */
1779         list_for_each_entry(prq, &packed->list, queuelist) {
1780                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1781                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1782                         (prq->cmd_flags & REQ_META) &&
1783                         (rq_data_dir(prq) == WRITE) &&
1784                         ((brq->data.blocks * brq->data.blksz) >=
1785                          card->ext_csd.data_tag_unit_size);
1786                 /* Argument of CMD23 */
1787                 packed_cmd_hdr[(i * 2)] =
1788                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1789                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1790                         blk_rq_sectors(prq);
1791                 /* Argument of CMD18 or CMD25 */
1792                 packed_cmd_hdr[((i * 2)) + 1] =
1793                         mmc_card_blockaddr(card) ?
1794                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1795                 packed->blocks += blk_rq_sectors(prq);
1796                 i++;
1797         }
1798
1799         memset(brq, 0, sizeof(struct mmc_blk_request));
1800         brq->mrq.cmd = &brq->cmd;
1801         brq->mrq.data = &brq->data;
1802         brq->mrq.sbc = &brq->sbc;
1803         brq->mrq.stop = &brq->stop;
1804
1805         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1806         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1807         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1808
1809         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1810         brq->cmd.arg = blk_rq_pos(req);
1811         if (!mmc_card_blockaddr(card))
1812                 brq->cmd.arg <<= 9;
1813         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1814
1815         brq->data.blksz = 512;
1816         brq->data.blocks = packed->blocks + hdr_blocks;
1817         brq->data.flags = MMC_DATA_WRITE;
1818
1819         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1820         brq->stop.arg = 0;
1821         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1822
1823         mmc_set_data_timeout(&brq->data, card);
1824
1825         brq->data.sg = mqrq->sg;
1826         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1827
1828         mqrq->mmc_active.mrq = &brq->mrq;
1829         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1830
1831         mmc_queue_bounce_pre(mqrq);
1832 }
1833
1834 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1835                            struct mmc_blk_request *brq, struct request *req,
1836                            int ret)
1837 {
1838         struct mmc_queue_req *mq_rq;
1839         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1840
1841         /*
1842          * If this is an SD card and we're writing, we can first
1843          * mark the known good sectors as ok.
1844          *
1845          * If the card is not SD, we can still ok written sectors
1846          * as reported by the controller (which might be less than
1847          * the real number of written sectors, but never more).
1848          */
1849         if (mmc_card_sd(card)) {
1850                 u32 blocks;
1851
1852                 blocks = mmc_sd_num_wr_blocks(card);
1853                 if (blocks != (u32)-1) {
1854                         ret = blk_end_request(req, 0, blocks << 9);
1855                 }
1856         } else {
1857                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1858                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1859         }
1860         return ret;
1861 }
1862
1863 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1864 {
1865         struct request *prq;
1866         struct mmc_packed *packed = mq_rq->packed;
1867         int idx = packed->idx_failure, i = 0;
1868         int ret = 0;
1869
1870         BUG_ON(!packed);
1871
1872         while (!list_empty(&packed->list)) {
1873                 prq = list_entry_rq(packed->list.next);
1874                 if (idx == i) {
1875                         /* retry from error index */
1876                         packed->nr_entries -= idx;
1877                         mq_rq->req = prq;
1878                         ret = 1;
1879
1880                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1881                                 list_del_init(&prq->queuelist);
1882                                 mmc_blk_clear_packed(mq_rq);
1883                         }
1884                         return ret;
1885                 }
1886                 list_del_init(&prq->queuelist);
1887                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1888                 i++;
1889         }
1890
1891         mmc_blk_clear_packed(mq_rq);
1892         return ret;
1893 }
1894
1895 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1896 {
1897         struct request *prq;
1898         struct mmc_packed *packed = mq_rq->packed;
1899
1900         BUG_ON(!packed);
1901
1902         while (!list_empty(&packed->list)) {
1903                 prq = list_entry_rq(packed->list.next);
1904                 list_del_init(&prq->queuelist);
1905                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1906         }
1907
1908         mmc_blk_clear_packed(mq_rq);
1909 }
1910
1911 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1912                                       struct mmc_queue_req *mq_rq)
1913 {
1914         struct request *prq;
1915         struct request_queue *q = mq->queue;
1916         struct mmc_packed *packed = mq_rq->packed;
1917
1918         BUG_ON(!packed);
1919
1920         while (!list_empty(&packed->list)) {
1921                 prq = list_entry_rq(packed->list.prev);
1922                 if (prq->queuelist.prev != &packed->list) {
1923                         list_del_init(&prq->queuelist);
1924                         spin_lock_irq(q->queue_lock);
1925                         blk_requeue_request(mq->queue, prq);
1926                         spin_unlock_irq(q->queue_lock);
1927                 } else {
1928                         list_del_init(&prq->queuelist);
1929                 }
1930         }
1931
1932         mmc_blk_clear_packed(mq_rq);
1933 }
1934
1935 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1936 {
1937         struct mmc_blk_data *md = mq->data;
1938         struct mmc_card *card = md->queue.card;
1939         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1940         int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1941         enum mmc_blk_status status;
1942         struct mmc_queue_req *mq_rq;
1943         struct request *req = rqc;
1944         struct mmc_async_req *areq;
1945         const u8 packed_nr = 2;
1946         u8 reqs = 0;
1947
1948         if (!rqc && !mq->mqrq_prev->req)
1949                 return 0;
1950
1951         if (rqc)
1952                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1953
1954         do {
1955                 if (rqc) {
1956                         /*
1957                          * When 4KB native sector is enabled, only 8 blocks
1958                          * multiple read or write is allowed
1959                          */
1960                         if ((brq->data.blocks & 0x07) &&
1961                             (card->ext_csd.data_sector_size == 4096)) {
1962                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1963                                         req->rq_disk->disk_name);
1964                                 mq_rq = mq->mqrq_cur;
1965                                 goto cmd_abort;
1966                         }
1967
1968                         if (reqs >= packed_nr)
1969                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1970                                                             card, mq);
1971                         else
1972                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1973                         areq = &mq->mqrq_cur->mmc_active;
1974                 } else
1975                         areq = NULL;
1976                 areq = mmc_start_req(card->host, areq, (int *) &status);
1977                 if (!areq) {
1978                         if (status == MMC_BLK_NEW_REQUEST)
1979                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1980                         return 0;
1981                 }
1982
1983                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1984                 brq = &mq_rq->brq;
1985                 req = mq_rq->req;
1986                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1987                 mmc_queue_bounce_post(mq_rq);
1988
1989                 switch (status) {
1990                 case MMC_BLK_SUCCESS:
1991                 case MMC_BLK_PARTIAL:
1992                         /*
1993                          * A block was successfully transferred.
1994                          */
1995                         mmc_blk_reset_success(md, type);
1996
1997                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1998                                 ret = mmc_blk_end_packed_req(mq_rq);
1999                                 break;
2000                         } else {
2001                                 ret = blk_end_request(req, 0,
2002                                                 brq->data.bytes_xfered);
2003                         }
2004
2005                         /*
2006                          * If the blk_end_request function returns non-zero even
2007                          * though all data has been transferred and no errors
2008                          * were returned by the host controller, it's a bug.
2009                          */
2010                         if (status == MMC_BLK_SUCCESS && ret) {
2011                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
2012                                        __func__, blk_rq_bytes(req),
2013                                        brq->data.bytes_xfered);
2014                                 rqc = NULL;
2015                                 goto cmd_abort;
2016                         }
2017                         break;
2018                 case MMC_BLK_CMD_ERR:
2019                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
2020                         if (mmc_blk_reset(md, card->host, type))
2021                                 goto cmd_abort;
2022                         if (!ret)
2023                                 goto start_new_req;
2024                         break;
2025                 case MMC_BLK_RETRY:
2026                         retune_retry_done = brq->retune_retry_done;
2027                         if (retry++ < 5)
2028                                 break;
2029                         /* Fall through */
2030                 case MMC_BLK_ABORT:
2031                         if (!mmc_blk_reset(md, card->host, type))
2032                                 break;
2033                         goto cmd_abort;
2034                 case MMC_BLK_DATA_ERR: {
2035                         int err;
2036
2037                         err = mmc_blk_reset(md, card->host, type);
2038                         if (!err)
2039                                 break;
2040                         if (err == -ENODEV ||
2041                                 mmc_packed_cmd(mq_rq->cmd_type))
2042                                 goto cmd_abort;
2043                         /* Fall through */
2044                 }
2045                 case MMC_BLK_ECC_ERR:
2046                         if (brq->data.blocks > 1) {
2047                                 /* Redo read one sector at a time */
2048                                 pr_warn("%s: retrying using single block read\n",
2049                                         req->rq_disk->disk_name);
2050                                 disable_multi = 1;
2051                                 break;
2052                         }
2053                         /*
2054                          * After an error, we redo I/O one sector at a
2055                          * time, so we only reach here after trying to
2056                          * read a single sector.
2057                          */
2058                         ret = blk_end_request(req, -EIO,
2059                                                 brq->data.blksz);
2060                         if (!ret)
2061                                 goto start_new_req;
2062                         break;
2063                 case MMC_BLK_NOMEDIUM:
2064                         goto cmd_abort;
2065                 default:
2066                         pr_err("%s: Unhandled return value (%d)",
2067                                         req->rq_disk->disk_name, status);
2068                         goto cmd_abort;
2069                 }
2070
2071                 if (ret) {
2072                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2073                                 if (!mq_rq->packed->retries)
2074                                         goto cmd_abort;
2075                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
2076                                 mmc_start_req(card->host,
2077                                               &mq_rq->mmc_active, NULL);
2078                         } else {
2079
2080                                 /*
2081                                  * In case of a incomplete request
2082                                  * prepare it again and resend.
2083                                  */
2084                                 mmc_blk_rw_rq_prep(mq_rq, card,
2085                                                 disable_multi, mq);
2086                                 mmc_start_req(card->host,
2087                                                 &mq_rq->mmc_active, NULL);
2088                         }
2089                         mq_rq->brq.retune_retry_done = retune_retry_done;
2090                 }
2091         } while (ret);
2092
2093         return 1;
2094
2095  cmd_abort:
2096         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2097                 mmc_blk_abort_packed_req(mq_rq);
2098         } else {
2099                 if (mmc_card_removed(card))
2100                         req->cmd_flags |= REQ_QUIET;
2101                 while (ret)
2102                         ret = blk_end_request(req, -EIO,
2103                                         blk_rq_cur_bytes(req));
2104         }
2105
2106  start_new_req:
2107         if (rqc) {
2108                 if (mmc_card_removed(card)) {
2109                         rqc->cmd_flags |= REQ_QUIET;
2110                         blk_end_request_all(rqc, -EIO);
2111                 } else {
2112                         /*
2113                          * If current request is packed, it needs to put back.
2114                          */
2115                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2116                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2117
2118                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2119                         mmc_start_req(card->host,
2120                                       &mq->mqrq_cur->mmc_active, NULL);
2121                 }
2122         }
2123
2124         return 0;
2125 }
2126
2127 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2128 {
2129         int ret;
2130         struct mmc_blk_data *md = mq->data;
2131         struct mmc_card *card = md->queue.card;
2132         struct mmc_host *host = card->host;
2133         unsigned long flags;
2134         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2135
2136         if (req && !mq->mqrq_prev->req)
2137                 /* claim host only for the first request */
2138                 mmc_get_card(card);
2139
2140         ret = mmc_blk_part_switch(card, md);
2141         if (ret) {
2142                 if (req) {
2143                         blk_end_request_all(req, -EIO);
2144                 }
2145                 ret = 0;
2146                 goto out;
2147         }
2148
2149         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2150         if (cmd_flags & REQ_DISCARD) {
2151                 /* complete ongoing async transfer before issuing discard */
2152                 if (card->host->areq)
2153                         mmc_blk_issue_rw_rq(mq, NULL);
2154                 if (req->cmd_flags & REQ_SECURE)
2155                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2156                 else
2157                         ret = mmc_blk_issue_discard_rq(mq, req);
2158         } else if (cmd_flags & REQ_FLUSH) {
2159                 /* complete ongoing async transfer before issuing flush */
2160                 if (card->host->areq)
2161                         mmc_blk_issue_rw_rq(mq, NULL);
2162                 ret = mmc_blk_issue_flush(mq, req);
2163         } else {
2164                 if (!req && host->areq) {
2165                         spin_lock_irqsave(&host->context_info.lock, flags);
2166                         host->context_info.is_waiting_last_req = true;
2167                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2168                 }
2169                 ret = mmc_blk_issue_rw_rq(mq, req);
2170         }
2171
2172 out:
2173         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2174              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2175                 /*
2176                  * Release host when there are no more requests
2177                  * and after special request(discard, flush) is done.
2178                  * In case sepecial request, there is no reentry to
2179                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2180                  */
2181                 mmc_put_card(card);
2182         return ret;
2183 }
2184
2185 static inline int mmc_blk_readonly(struct mmc_card *card)
2186 {
2187         return mmc_card_readonly(card) ||
2188                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2189 }
2190
2191 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2192                                               struct device *parent,
2193                                               sector_t size,
2194                                               bool default_ro,
2195                                               const char *subname,
2196                                               int area_type)
2197 {
2198         struct mmc_blk_data *md;
2199         int devidx, ret;
2200
2201 again:
2202         if (!ida_pre_get(&mmc_blk_ida, GFP_KERNEL))
2203                 return ERR_PTR(-ENOMEM);
2204
2205         spin_lock(&mmc_blk_lock);
2206         ret = ida_get_new(&mmc_blk_ida, &devidx);
2207         spin_unlock(&mmc_blk_lock);
2208
2209         if (ret == -EAGAIN)
2210                 goto again;
2211         else if (ret)
2212                 return ERR_PTR(ret);
2213
2214         if (devidx >= max_devices) {
2215                 ret = -ENOSPC;
2216                 goto out;
2217         }
2218
2219         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2220         if (!md) {
2221                 ret = -ENOMEM;
2222                 goto out;
2223         }
2224
2225         md->area_type = area_type;
2226
2227         /*
2228          * Set the read-only status based on the supported commands
2229          * and the write protect switch.
2230          */
2231         md->read_only = mmc_blk_readonly(card);
2232
2233         md->disk = alloc_disk(perdev_minors);
2234         if (md->disk == NULL) {
2235                 ret = -ENOMEM;
2236                 goto err_kfree;
2237         }
2238
2239         spin_lock_init(&md->lock);
2240         INIT_LIST_HEAD(&md->part);
2241         md->usage = 1;
2242
2243         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2244         if (ret)
2245                 goto err_putdisk;
2246
2247         md->queue.issue_fn = mmc_blk_issue_rq;
2248         md->queue.data = md;
2249
2250         md->disk->major = MMC_BLOCK_MAJOR;
2251         md->disk->first_minor = devidx * perdev_minors;
2252         md->disk->fops = &mmc_bdops;
2253         md->disk->private_data = md;
2254         md->disk->queue = md->queue.queue;
2255         md->disk->driverfs_dev = parent;
2256         set_disk_ro(md->disk, md->read_only || default_ro);
2257         md->disk->flags = GENHD_FL_EXT_DEVT;
2258         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2259                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2260
2261         /*
2262          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2263          *
2264          * - be set for removable media with permanent block devices
2265          * - be unset for removable block devices with permanent media
2266          *
2267          * Since MMC block devices clearly fall under the second
2268          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2269          * should use the block device creation/destruction hotplug
2270          * messages to tell when the card is present.
2271          */
2272
2273         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2274                  "mmcblk%u%s", card->host->index, subname ? subname : "");
2275
2276         if (mmc_card_mmc(card))
2277                 blk_queue_logical_block_size(md->queue.queue,
2278                                              card->ext_csd.data_sector_size);
2279         else
2280                 blk_queue_logical_block_size(md->queue.queue, 512);
2281
2282         set_capacity(md->disk, size);
2283
2284         if (mmc_host_cmd23(card->host)) {
2285                 if (mmc_card_mmc(card) ||
2286                     (mmc_card_sd(card) &&
2287                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2288                         md->flags |= MMC_BLK_CMD23;
2289         }
2290
2291         if (mmc_card_mmc(card) &&
2292             md->flags & MMC_BLK_CMD23 &&
2293             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2294              card->ext_csd.rel_sectors)) {
2295                 md->flags |= MMC_BLK_REL_WR;
2296                 blk_queue_write_cache(md->queue.queue, true, true);
2297         }
2298
2299         if (mmc_card_mmc(card) &&
2300             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2301             (md->flags & MMC_BLK_CMD23) &&
2302             card->ext_csd.packed_event_en) {
2303                 if (!mmc_packed_init(&md->queue, card))
2304                         md->flags |= MMC_BLK_PACKED_CMD;
2305         }
2306
2307         return md;
2308
2309  err_putdisk:
2310         put_disk(md->disk);
2311  err_kfree:
2312         kfree(md);
2313  out:
2314         spin_lock(&mmc_blk_lock);
2315         ida_remove(&mmc_blk_ida, devidx);
2316         spin_unlock(&mmc_blk_lock);
2317         return ERR_PTR(ret);
2318 }
2319
2320 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2321 {
2322         sector_t size;
2323
2324         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2325                 /*
2326                  * The EXT_CSD sector count is in number or 512 byte
2327                  * sectors.
2328                  */
2329                 size = card->ext_csd.sectors;
2330         } else {
2331                 /*
2332                  * The CSD capacity field is in units of read_blkbits.
2333                  * set_capacity takes units of 512 bytes.
2334                  */
2335                 size = (typeof(sector_t))card->csd.capacity
2336                         << (card->csd.read_blkbits - 9);
2337         }
2338
2339         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2340                                         MMC_BLK_DATA_AREA_MAIN);
2341 }
2342
2343 static int mmc_blk_alloc_part(struct mmc_card *card,
2344                               struct mmc_blk_data *md,
2345                               unsigned int part_type,
2346                               sector_t size,
2347                               bool default_ro,
2348                               const char *subname,
2349                               int area_type)
2350 {
2351         char cap_str[10];
2352         struct mmc_blk_data *part_md;
2353
2354         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2355                                     subname, area_type);
2356         if (IS_ERR(part_md))
2357                 return PTR_ERR(part_md);
2358         part_md->part_type = part_type;
2359         list_add(&part_md->part, &md->part);
2360
2361         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2362                         cap_str, sizeof(cap_str));
2363         pr_info("%s: %s %s partition %u %s\n",
2364                part_md->disk->disk_name, mmc_card_id(card),
2365                mmc_card_name(card), part_md->part_type, cap_str);
2366         return 0;
2367 }
2368
2369 /* MMC Physical partitions consist of two boot partitions and
2370  * up to four general purpose partitions.
2371  * For each partition enabled in EXT_CSD a block device will be allocatedi
2372  * to provide access to the partition.
2373  */
2374
2375 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2376 {
2377         int idx, ret = 0;
2378
2379         if (!mmc_card_mmc(card))
2380                 return 0;
2381
2382         for (idx = 0; idx < card->nr_parts; idx++) {
2383                 if (card->part[idx].size) {
2384                         ret = mmc_blk_alloc_part(card, md,
2385                                 card->part[idx].part_cfg,
2386                                 card->part[idx].size >> 9,
2387                                 card->part[idx].force_ro,
2388                                 card->part[idx].name,
2389                                 card->part[idx].area_type);
2390                         if (ret)
2391                                 return ret;
2392                 }
2393         }
2394
2395         return ret;
2396 }
2397
2398 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2399 {
2400         struct mmc_card *card;
2401
2402         if (md) {
2403                 /*
2404                  * Flush remaining requests and free queues. It
2405                  * is freeing the queue that stops new requests
2406                  * from being accepted.
2407                  */
2408                 card = md->queue.card;
2409                 mmc_cleanup_queue(&md->queue);
2410                 if (md->flags & MMC_BLK_PACKED_CMD)
2411                         mmc_packed_clean(&md->queue);
2412                 if (md->disk->flags & GENHD_FL_UP) {
2413                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2414                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2415                                         card->ext_csd.boot_ro_lockable)
2416                                 device_remove_file(disk_to_dev(md->disk),
2417                                         &md->power_ro_lock);
2418
2419                         del_gendisk(md->disk);
2420                 }
2421                 mmc_blk_put(md);
2422         }
2423 }
2424
2425 static void mmc_blk_remove_parts(struct mmc_card *card,
2426                                  struct mmc_blk_data *md)
2427 {
2428         struct list_head *pos, *q;
2429         struct mmc_blk_data *part_md;
2430
2431         list_for_each_safe(pos, q, &md->part) {
2432                 part_md = list_entry(pos, struct mmc_blk_data, part);
2433                 list_del(pos);
2434                 mmc_blk_remove_req(part_md);
2435         }
2436 }
2437
2438 static int mmc_add_disk(struct mmc_blk_data *md)
2439 {
2440         int ret;
2441         struct mmc_card *card = md->queue.card;
2442
2443         add_disk(md->disk);
2444         md->force_ro.show = force_ro_show;
2445         md->force_ro.store = force_ro_store;
2446         sysfs_attr_init(&md->force_ro.attr);
2447         md->force_ro.attr.name = "force_ro";
2448         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2449         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2450         if (ret)
2451                 goto force_ro_fail;
2452
2453         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2454              card->ext_csd.boot_ro_lockable) {
2455                 umode_t mode;
2456
2457                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2458                         mode = S_IRUGO;
2459                 else
2460                         mode = S_IRUGO | S_IWUSR;
2461
2462                 md->power_ro_lock.show = power_ro_lock_show;
2463                 md->power_ro_lock.store = power_ro_lock_store;
2464                 sysfs_attr_init(&md->power_ro_lock.attr);
2465                 md->power_ro_lock.attr.mode = mode;
2466                 md->power_ro_lock.attr.name =
2467                                         "ro_lock_until_next_power_on";
2468                 ret = device_create_file(disk_to_dev(md->disk),
2469                                 &md->power_ro_lock);
2470                 if (ret)
2471                         goto power_ro_lock_fail;
2472         }
2473         return ret;
2474
2475 power_ro_lock_fail:
2476         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2477 force_ro_fail:
2478         del_gendisk(md->disk);
2479
2480         return ret;
2481 }
2482
2483 #define CID_MANFID_SANDISK      0x2
2484 #define CID_MANFID_TOSHIBA      0x11
2485 #define CID_MANFID_MICRON       0x13
2486 #define CID_MANFID_SAMSUNG      0x15
2487 #define CID_MANFID_KINGSTON     0x70
2488
2489 static const struct mmc_fixup blk_fixups[] =
2490 {
2491         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2492                   MMC_QUIRK_INAND_CMD38),
2493         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2494                   MMC_QUIRK_INAND_CMD38),
2495         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2496                   MMC_QUIRK_INAND_CMD38),
2497         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2498                   MMC_QUIRK_INAND_CMD38),
2499         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2500                   MMC_QUIRK_INAND_CMD38),
2501
2502         /*
2503          * Some MMC cards experience performance degradation with CMD23
2504          * instead of CMD12-bounded multiblock transfers. For now we'll
2505          * black list what's bad...
2506          * - Certain Toshiba cards.
2507          *
2508          * N.B. This doesn't affect SD cards.
2509          */
2510         MMC_FIXUP("SDMB-32", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2511                   MMC_QUIRK_BLK_NO_CMD23),
2512         MMC_FIXUP("SDM032", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2513                   MMC_QUIRK_BLK_NO_CMD23),
2514         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2515                   MMC_QUIRK_BLK_NO_CMD23),
2516         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2517                   MMC_QUIRK_BLK_NO_CMD23),
2518         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2519                   MMC_QUIRK_BLK_NO_CMD23),
2520
2521         /*
2522          * Some Micron MMC cards needs longer data read timeout than
2523          * indicated in CSD.
2524          */
2525         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2526                   MMC_QUIRK_LONG_READ_TIME),
2527
2528         /*
2529          * On these Samsung MoviNAND parts, performing secure erase or
2530          * secure trim can result in unrecoverable corruption due to a
2531          * firmware bug.
2532          */
2533         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2534                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2535         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2536                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2537         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2538                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2539         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2540                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2541         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2542                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2543         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2544                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2545         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2546                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2547         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2548                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2549
2550         /*
2551          *  On Some Kingston eMMCs, performing trim can result in
2552          *  unrecoverable data conrruption occasionally due to a firmware bug.
2553          */
2554         MMC_FIXUP("V10008", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2555                   MMC_QUIRK_TRIM_BROKEN),
2556         MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2557                   MMC_QUIRK_TRIM_BROKEN),
2558
2559         END_FIXUP
2560 };
2561
2562 static int mmc_blk_probe(struct mmc_card *card)
2563 {
2564         struct mmc_blk_data *md, *part_md;
2565         char cap_str[10];
2566
2567         /*
2568          * Check that the card supports the command class(es) we need.
2569          */
2570         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2571                 return -ENODEV;
2572
2573         mmc_fixup_device(card, blk_fixups);
2574
2575         md = mmc_blk_alloc(card);
2576         if (IS_ERR(md))
2577                 return PTR_ERR(md);
2578
2579         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2580                         cap_str, sizeof(cap_str));
2581         pr_info("%s: %s %s %s %s\n",
2582                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2583                 cap_str, md->read_only ? "(ro)" : "");
2584
2585         if (mmc_blk_alloc_parts(card, md))
2586                 goto out;
2587
2588         dev_set_drvdata(&card->dev, md);
2589
2590         if (mmc_add_disk(md))
2591                 goto out;
2592
2593         list_for_each_entry(part_md, &md->part, part) {
2594                 if (mmc_add_disk(part_md))
2595                         goto out;
2596         }
2597
2598         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2599         pm_runtime_use_autosuspend(&card->dev);
2600
2601         /*
2602          * Don't enable runtime PM for SD-combo cards here. Leave that
2603          * decision to be taken during the SDIO init sequence instead.
2604          */
2605         if (card->type != MMC_TYPE_SD_COMBO) {
2606                 pm_runtime_set_active(&card->dev);
2607                 pm_runtime_enable(&card->dev);
2608         }
2609
2610         return 0;
2611
2612  out:
2613         mmc_blk_remove_parts(card, md);
2614         mmc_blk_remove_req(md);
2615         return 0;
2616 }
2617
2618 static void mmc_blk_remove(struct mmc_card *card)
2619 {
2620         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2621
2622         mmc_blk_remove_parts(card, md);
2623         pm_runtime_get_sync(&card->dev);
2624         mmc_claim_host(card->host);
2625         mmc_blk_part_switch(card, md);
2626         mmc_release_host(card->host);
2627         if (card->type != MMC_TYPE_SD_COMBO)
2628                 pm_runtime_disable(&card->dev);
2629         pm_runtime_put_noidle(&card->dev);
2630         mmc_blk_remove_req(md);
2631         dev_set_drvdata(&card->dev, NULL);
2632 }
2633
2634 static int _mmc_blk_suspend(struct mmc_card *card)
2635 {
2636         struct mmc_blk_data *part_md;
2637         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2638
2639         if (md) {
2640                 mmc_queue_suspend(&md->queue);
2641                 list_for_each_entry(part_md, &md->part, part) {
2642                         mmc_queue_suspend(&part_md->queue);
2643                 }
2644         }
2645         return 0;
2646 }
2647
2648 static void mmc_blk_shutdown(struct mmc_card *card)
2649 {
2650         _mmc_blk_suspend(card);
2651 }
2652
2653 #ifdef CONFIG_PM_SLEEP
2654 static int mmc_blk_suspend(struct device *dev)
2655 {
2656         struct mmc_card *card = mmc_dev_to_card(dev);
2657
2658         return _mmc_blk_suspend(card);
2659 }
2660
2661 static int mmc_blk_resume(struct device *dev)
2662 {
2663         struct mmc_blk_data *part_md;
2664         struct mmc_blk_data *md = dev_get_drvdata(dev);
2665
2666         if (md) {
2667                 /*
2668                  * Resume involves the card going into idle state,
2669                  * so current partition is always the main one.
2670                  */
2671                 md->part_curr = md->part_type;
2672                 mmc_queue_resume(&md->queue);
2673                 list_for_each_entry(part_md, &md->part, part) {
2674                         mmc_queue_resume(&part_md->queue);
2675                 }
2676         }
2677         return 0;
2678 }
2679 #endif
2680
2681 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2682
2683 static struct mmc_driver mmc_driver = {
2684         .drv            = {
2685                 .name   = "mmcblk",
2686                 .pm     = &mmc_blk_pm_ops,
2687         },
2688         .probe          = mmc_blk_probe,
2689         .remove         = mmc_blk_remove,
2690         .shutdown       = mmc_blk_shutdown,
2691 };
2692
2693 static int __init mmc_blk_init(void)
2694 {
2695         int res;
2696
2697         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2698                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2699
2700         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2701
2702         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2703         if (res)
2704                 goto out;
2705
2706         res = mmc_register_driver(&mmc_driver);
2707         if (res)
2708                 goto out2;
2709
2710         return 0;
2711  out2:
2712         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2713  out:
2714         return res;
2715 }
2716
2717 static void __exit mmc_blk_exit(void)
2718 {
2719         mmc_unregister_driver(&mmc_driver);
2720         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2721 }
2722
2723 module_init(mmc_blk_init);
2724 module_exit(mmc_blk_exit);
2725
2726 MODULE_LICENSE("GPL");
2727 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2728