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 device   *parent;
  97         struct gendisk  *disk;
  98         struct mmc_queue queue;
  99         struct list_head part;
 100
 101         unsigned int    flags;
 102 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
 103 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
 104 #define MMC_BLK_PACKED_CMD      (1 << 2)        /* MMC packed command support */
 105
 106         unsigned int    usage;
 107         unsigned int    read_only;
 108         unsigned int    part_type;
 109         unsigned int    reset_done;
 110 #define MMC_BLK_READ            BIT(0)
 111 #define MMC_BLK_WRITE           BIT(1)
 112 #define MMC_BLK_DISCARD         BIT(2)
 113 #define MMC_BLK_SECDISCARD      BIT(3)
 114
 115         /*
 116          * Only set in main mmc_blk_data associated
 117          * with mmc_card with dev_set_drvdata, and keeps
 118          * track of the current selected device partition.
 119          */
 120         unsigned int    part_curr;
 121         struct device_attribute force_ro;
 122         struct device_attribute power_ro_lock;
 123         int     area_type;
 124 };
 125
 126 static DEFINE_MUTEX(open_lock);
 127
 128 enum {
 129         MMC_PACKED_NR_IDX = -1,
 130         MMC_PACKED_NR_ZERO,
 131         MMC_PACKED_NR_SINGLE,
 132 };
 133
 134 module_param(perdev_minors, int, 0444);
 135 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 136
 137 static inline int mmc_blk_part_switch(struct mmc_card *card,
 138                                       struct mmc_blk_data *md);
 139 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 140
 141 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 142 {
 143         struct mmc_packed *packed = mqrq->packed;
 144
 145         mqrq->cmd_type = MMC_PACKED_NONE;
 146         packed->nr_entries = MMC_PACKED_NR_ZERO;
 147         packed->idx_failure = MMC_PACKED_NR_IDX;
 148         packed->retries = 0;
 149         packed->blocks = 0;
 150 }
 151
 152 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 153 {
 154         struct mmc_blk_data *md;
 155
 156         mutex_lock(&open_lock);
 157         md = disk->private_data;
 158         if (md && md->usage == 0)
 159                 md = NULL;
 160         if (md)
 161                 md->usage++;
 162         mutex_unlock(&open_lock);
 163
 164         return md;
 165 }
 166
 167 static inline int mmc_get_devidx(struct gendisk *disk)
 168 {
 169         int devidx = disk->first_minor / perdev_minors;
 170         return devidx;
 171 }
 172
 173 static void mmc_blk_put(struct mmc_blk_data *md)
 174 {
 175         mutex_lock(&open_lock);
 176         md->usage--;
 177         if (md->usage == 0) {
 178                 int devidx = mmc_get_devidx(md->disk);
 179                 blk_cleanup_queue(md->queue.queue);
 180
 181                 spin_lock(&mmc_blk_lock);
 182                 ida_remove(&mmc_blk_ida, devidx);
 183                 spin_unlock(&mmc_blk_lock);
 184
 185                 put_disk(md->disk);
 186                 kfree(md);
 187         }
 188         mutex_unlock(&open_lock);
 189 }
 190
 191 static ssize_t power_ro_lock_show(struct device *dev,
 192                 struct device_attribute *attr, char *buf)
 193 {
 194         int ret;
 195         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 196         struct mmc_card *card = md->queue.card;
 197         int locked = 0;
 198
 199         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 200                 locked = 2;
 201         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 202                 locked = 1;
 203
 204         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 205
 206         mmc_blk_put(md);
 207
 208         return ret;
 209 }
 210
 211 static ssize_t power_ro_lock_store(struct device *dev,
 212                 struct device_attribute *attr, const char *buf, size_t count)
 213 {
 214         int ret;
 215         struct mmc_blk_data *md, *part_md;
 216         struct mmc_card *card;
 217         unsigned long set;
 218
 219         if (kstrtoul(buf, 0, &set))
 220                 return -EINVAL;
 221
 222         if (set != 1)
 223                 return count;
 224
 225         md = mmc_blk_get(dev_to_disk(dev));
 226         card = md->queue.card;
 227
 228         mmc_get_card(card);
 229
 230         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 231                                 card->ext_csd.boot_ro_lock |
 232                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 233                                 card->ext_csd.part_time);
 234         if (ret)
 235                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 236         else
 237                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 238
 239         mmc_put_card(card);
 240
 241         if (!ret) {
 242                 pr_info("%s: Locking boot partition ro until next power on\n",
 243                         md->disk->disk_name);
 244                 set_disk_ro(md->disk, 1);
 245
 246                 list_for_each_entry(part_md, &md->part, part)
 247                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 248                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 249                                 set_disk_ro(part_md->disk, 1);
 250                         }
 251         }
 252
 253         mmc_blk_put(md);
 254         return count;
 255 }
 256
 257 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 258                              char *buf)
 259 {
 260         int ret;
 261         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 262
 263         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 264                        get_disk_ro(dev_to_disk(dev)) ^
 265                        md->read_only);
 266         mmc_blk_put(md);
 267         return ret;
 268 }
 269
 270 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 271                               const char *buf, size_t count)
 272 {
 273         int ret;
 274         char *end;
 275         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 276         unsigned long set = simple_strtoul(buf, &end, 0);
 277         if (end == buf) {
 278                 ret = -EINVAL;
 279                 goto out;
 280         }
 281
 282         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 283         ret = count;
 284 out:
 285         mmc_blk_put(md);
 286         return ret;
 287 }
 288
 289 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 290 {
 291         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 292         int ret = -ENXIO;
 293
 294         mutex_lock(&block_mutex);
 295         if (md) {
 296                 if (md->usage == 2)
 297                         check_disk_change(bdev);
 298                 ret = 0;
 299
 300                 if ((mode & FMODE_WRITE) && md->read_only) {
 301                         mmc_blk_put(md);
 302                         ret = -EROFS;
 303                 }
 304         }
 305         mutex_unlock(&block_mutex);
 306
 307         return ret;
 308 }
 309
 310 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 311 {
 312         struct mmc_blk_data *md = disk->private_data;
 313
 314         mutex_lock(&block_mutex);
 315         mmc_blk_put(md);
 316         mutex_unlock(&block_mutex);
 317 }
 318
 319 static int
 320 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 321 {
 322         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 323         geo->heads = 4;
 324         geo->sectors = 16;
 325         return 0;
 326 }
 327
 328 struct mmc_blk_ioc_data {
 329         struct mmc_ioc_cmd ic;
 330         unsigned char *buf;
 331         u64 buf_bytes;
 332 };
 333
 334 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 335         struct mmc_ioc_cmd __user *user)
 336 {
 337         struct mmc_blk_ioc_data *idata;
 338         int err;
 339
 340         idata = kmalloc(sizeof(*idata), GFP_KERNEL);
 341         if (!idata) {
 342                 err = -ENOMEM;
 343                 goto out;
 344         }
 345
 346         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 347                 err = -EFAULT;
 348                 goto idata_err;
 349         }
 350
 351         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 352         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 353                 err = -EOVERFLOW;
 354                 goto idata_err;
 355         }
 356
 357         if (!idata->buf_bytes) {
 358                 idata->buf = NULL;
 359                 return idata;
 360         }
 361
 362         idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
 363         if (!idata->buf) {
 364                 err = -ENOMEM;
 365                 goto idata_err;
 366         }
 367
 368         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 369                                         idata->ic.data_ptr, idata->buf_bytes)) {
 370                 err = -EFAULT;
 371                 goto copy_err;
 372         }
 373
 374         return idata;
 375
 376 copy_err:
 377         kfree(idata->buf);
 378 idata_err:
 379         kfree(idata);
 380 out:
 381         return ERR_PTR(err);
 382 }
 383
 384 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
 385                                       struct mmc_blk_ioc_data *idata)
 386 {
 387         struct mmc_ioc_cmd *ic = &idata->ic;
 388
 389         if (copy_to_user(&(ic_ptr->response), ic->response,
 390                          sizeof(ic->response)))
 391                 return -EFAULT;
 392
 393         if (!idata->ic.write_flag) {
 394                 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
 395                                  idata->buf, idata->buf_bytes))
 396                         return -EFAULT;
 397         }
 398
 399         return 0;
 400 }
 401
 402 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 403                                        u32 retries_max)
 404 {
 405         int err;
 406         u32 retry_count = 0;
 407
 408         if (!status || !retries_max)
 409                 return -EINVAL;
 410
 411         do {
 412                 err = get_card_status(card, status, 5);
 413                 if (err)
 414                         break;
 415
 416                 if (!R1_STATUS(*status) &&
 417                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 418                         break; /* RPMB programming operation complete */
 419
 420                 /*
 421                  * Rechedule to give the MMC device a chance to continue
 422                  * processing the previous command without being polled too
 423                  * frequently.
 424                  */
 425                 usleep_range(1000, 5000);
 426         } while (++retry_count < retries_max);
 427
 428         if (retry_count == retries_max)
 429                 err = -EPERM;
 430
 431         return err;
 432 }
 433
 434 static int ioctl_do_sanitize(struct mmc_card *card)
 435 {
 436         int err;
 437
 438         if (!mmc_can_sanitize(card)) {
 439                         pr_warn("%s: %s - SANITIZE is not supported\n",
 440                                 mmc_hostname(card->host), __func__);
 441                         err = -EOPNOTSUPP;
 442                         goto out;
 443         }
 444
 445         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 446                 mmc_hostname(card->host), __func__);
 447
 448         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 449                                         EXT_CSD_SANITIZE_START, 1,
 450                                         MMC_SANITIZE_REQ_TIMEOUT);
 451
 452         if (err)
 453                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 454                        mmc_hostname(card->host), __func__, err);
 455
 456         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 457                                              __func__);
 458 out:
 459         return err;
 460 }
 461
 462 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 463                                struct mmc_blk_ioc_data *idata)
 464 {
 465         struct mmc_command cmd = {0};
 466         struct mmc_data data = {0};
 467         struct mmc_request mrq = {NULL};
 468         struct scatterlist sg;
 469         int err;
 470         int is_rpmb = false;
 471         u32 status = 0;
 472
 473         if (!card || !md || !idata)
 474                 return -EINVAL;
 475
 476         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 477                 is_rpmb = true;
 478
 479         cmd.opcode = idata->ic.opcode;
 480         cmd.arg = idata->ic.arg;
 481         cmd.flags = idata->ic.flags;
 482
 483         if (idata->buf_bytes) {
 484                 data.sg = &sg;
 485                 data.sg_len = 1;
 486                 data.blksz = idata->ic.blksz;
 487                 data.blocks = idata->ic.blocks;
 488
 489                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 490
 491                 if (idata->ic.write_flag)
 492                         data.flags = MMC_DATA_WRITE;
 493                 else
 494                         data.flags = MMC_DATA_READ;
 495
 496                 /* data.flags must already be set before doing this. */
 497                 mmc_set_data_timeout(&data, card);
 498
 499                 /* Allow overriding the timeout_ns for empirical tuning. */
 500                 if (idata->ic.data_timeout_ns)
 501                         data.timeout_ns = idata->ic.data_timeout_ns;
 502
 503                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 504                         /*
 505                          * Pretend this is a data transfer and rely on the
 506                          * host driver to compute timeout.  When all host
 507                          * drivers support cmd.cmd_timeout for R1B, this
 508                          * can be changed to:
 509                          *
 510                          *     mrq.data = NULL;
 511                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 512                          */
 513                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 514                 }
 515
 516                 mrq.data = &data;
 517         }
 518
 519         mrq.cmd = &cmd;
 520
 521         err = mmc_blk_part_switch(card, md);
 522         if (err)
 523                 return err;
 524
 525         if (idata->ic.is_acmd) {
 526                 err = mmc_app_cmd(card->host, card);
 527                 if (err)
 528                         return err;
 529         }
 530
 531         if (is_rpmb) {
 532                 err = mmc_set_blockcount(card, data.blocks,
 533                         idata->ic.write_flag & (1 << 31));
 534                 if (err)
 535                         return err;
 536         }
 537
 538         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 539             (cmd.opcode == MMC_SWITCH)) {
 540                 err = ioctl_do_sanitize(card);
 541
 542                 if (err)
 543                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 544                                __func__, err);
 545
 546                 return err;
 547         }
 548
 549         mmc_wait_for_req(card->host, &mrq);
 550
 551         if (cmd.error) {
 552                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 553                                                 __func__, cmd.error);
 554                 return cmd.error;
 555         }
 556         if (data.error) {
 557                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 558                                                 __func__, data.error);
 559                 return data.error;
 560         }
 561
 562         /*
 563          * According to the SD specs, some commands require a delay after
 564          * issuing the command.
 565          */
 566         if (idata->ic.postsleep_min_us)
 567                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 568
 569         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
 570
 571         if (is_rpmb) {
 572                 /*
 573                  * Ensure RPMB command has completed by polling CMD13
 574                  * "Send Status".
 575                  */
 576                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 577                 if (err)
 578                         dev_err(mmc_dev(card->host),
 579                                         "%s: Card Status=0x%08X, error %d\n",
 580                                         __func__, status, err);
 581         }
 582
 583         return err;
 584 }
 585
 586 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 587                              struct mmc_ioc_cmd __user *ic_ptr)
 588 {
 589         struct mmc_blk_ioc_data *idata;
 590         struct mmc_blk_data *md;
 591         struct mmc_card *card;
 592         int err = 0, ioc_err = 0;
 593
 594         /*
 595          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 596          * whole block device, not on a partition.  This prevents overspray
 597          * between sibling partitions.
 598          */
 599         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 600                 return -EPERM;
 601
 602         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 603         if (IS_ERR(idata))
 604                 return PTR_ERR(idata);
 605
 606         md = mmc_blk_get(bdev->bd_disk);
 607         if (!md) {
 608                 err = -EINVAL;
 609                 goto cmd_err;
 610         }
 611
 612         card = md->queue.card;
 613         if (IS_ERR(card)) {
 614                 err = PTR_ERR(card);
 615                 goto cmd_done;
 616         }
 617
 618         mmc_get_card(card);
 619
 620         ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
 621
 622         /* Always switch back to main area after RPMB access */
 623         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 624                 mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
 625
 626         mmc_put_card(card);
 627
 628         err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
 629
 630 cmd_done:
 631         mmc_blk_put(md);
 632 cmd_err:
 633         kfree(idata->buf);
 634         kfree(idata);
 635         return ioc_err ? ioc_err : err;
 636 }
 637
 638 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 639                                    struct mmc_ioc_multi_cmd __user *user)
 640 {
 641         struct mmc_blk_ioc_data **idata = NULL;
 642         struct mmc_ioc_cmd __user *cmds = user->cmds;
 643         struct mmc_card *card;
 644         struct mmc_blk_data *md;
 645         int i, err = 0, ioc_err = 0;
 646         __u64 num_of_cmds;
 647
 648         /*
 649          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 650          * whole block device, not on a partition.  This prevents overspray
 651          * between sibling partitions.
 652          */
 653         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 654                 return -EPERM;
 655
 656         if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
 657                            sizeof(num_of_cmds)))
 658                 return -EFAULT;
 659
 660         if (num_of_cmds > MMC_IOC_MAX_CMDS)
 661                 return -EINVAL;
 662
 663         idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
 664         if (!idata)
 665                 return -ENOMEM;
 666
 667         for (i = 0; i < num_of_cmds; i++) {
 668                 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
 669                 if (IS_ERR(idata[i])) {
 670                         err = PTR_ERR(idata[i]);
 671                         num_of_cmds = i;
 672                         goto cmd_err;
 673                 }
 674         }
 675
 676         md = mmc_blk_get(bdev->bd_disk);
 677         if (!md) {
 678                 err = -EINVAL;
 679                 goto cmd_err;
 680         }
 681
 682         card = md->queue.card;
 683         if (IS_ERR(card)) {
 684                 err = PTR_ERR(card);
 685                 goto cmd_done;
 686         }
 687
 688         mmc_get_card(card);
 689
 690         for (i = 0; i < num_of_cmds && !ioc_err; i++)
 691                 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 692
 693         /* Always switch back to main area after RPMB access */
 694         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 695                 mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
 696
 697         mmc_put_card(card);
 698
 699         /* copy to user if data and response */
 700         for (i = 0; i < num_of_cmds && !err; i++)
 701                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 702
 703 cmd_done:
 704         mmc_blk_put(md);
 705 cmd_err:
 706         for (i = 0; i < num_of_cmds; i++) {
 707                 kfree(idata[i]->buf);
 708                 kfree(idata[i]);
 709         }
 710         kfree(idata);
 711         return ioc_err ? ioc_err : err;
 712 }
 713
 714 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 715         unsigned int cmd, unsigned long arg)
 716 {
 717         switch (cmd) {
 718         case MMC_IOC_CMD:
 719                 return mmc_blk_ioctl_cmd(bdev,
 720                                 (struct mmc_ioc_cmd __user *)arg);
 721         case MMC_IOC_MULTI_CMD:
 722                 return mmc_blk_ioctl_multi_cmd(bdev,
 723                                 (struct mmc_ioc_multi_cmd __user *)arg);
 724         default:
 725                 return -EINVAL;
 726         }
 727 }
 728
 729 #ifdef CONFIG_COMPAT
 730 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 731         unsigned int cmd, unsigned long arg)
 732 {
 733         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 734 }
 735 #endif
 736
 737 static const struct block_device_operations mmc_bdops = {
 738         .open                   = mmc_blk_open,
 739         .release                = mmc_blk_release,
 740         .getgeo                 = mmc_blk_getgeo,
 741         .owner                  = THIS_MODULE,
 742         .ioctl                  = mmc_blk_ioctl,
 743 #ifdef CONFIG_COMPAT
 744         .compat_ioctl           = mmc_blk_compat_ioctl,
 745 #endif
 746 };
 747
 748 static inline int mmc_blk_part_switch(struct mmc_card *card,
 749                                       struct mmc_blk_data *md)
 750 {
 751         int ret;
 752         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 753
 754         if (main_md->part_curr == md->part_type)
 755                 return 0;
 756
 757         if (mmc_card_mmc(card)) {
 758                 u8 part_config = card->ext_csd.part_config;
 759
 760                 if (md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
 761                         mmc_retune_pause(card->host);
 762
 763                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 764                 part_config |= md->part_type;
 765
 766                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 767                                  EXT_CSD_PART_CONFIG, part_config,
 768                                  card->ext_csd.part_time);
 769                 if (ret) {
 770                         if (md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
 771                                 mmc_retune_unpause(card->host);
 772                         return ret;
 773                 }
 774
 775                 card->ext_csd.part_config = part_config;
 776
 777                 if (main_md->part_curr == EXT_CSD_PART_CONFIG_ACC_RPMB)
 778                         mmc_retune_unpause(card->host);
 779         }
 780
 781         main_md->part_curr = md->part_type;
 782         return 0;
 783 }
 784
 785 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 786 {
 787         int err;
 788         u32 result;
 789         __be32 *blocks;
 790
 791         struct mmc_request mrq = {NULL};
 792         struct mmc_command cmd = {0};
 793         struct mmc_data data = {0};
 794
 795         struct scatterlist sg;
 796
 797         cmd.opcode = MMC_APP_CMD;
 798         cmd.arg = card->rca << 16;
 799         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 800
 801         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 802         if (err)
 803                 return (u32)-1;
 804         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 805                 return (u32)-1;
 806
 807         memset(&cmd, 0, sizeof(struct mmc_command));
 808
 809         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 810         cmd.arg = 0;
 811         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 812
 813         data.blksz = 4;
 814         data.blocks = 1;
 815         data.flags = MMC_DATA_READ;
 816         data.sg = &sg;
 817         data.sg_len = 1;
 818         mmc_set_data_timeout(&data, card);
 819
 820         mrq.cmd = &cmd;
 821         mrq.data = &data;
 822
 823         blocks = kmalloc(4, GFP_KERNEL);
 824         if (!blocks)
 825                 return (u32)-1;
 826
 827         sg_init_one(&sg, blocks, 4);
 828
 829         mmc_wait_for_req(card->host, &mrq);
 830
 831         result = ntohl(*blocks);
 832         kfree(blocks);
 833
 834         if (cmd.error || data.error)
 835                 result = (u32)-1;
 836
 837         return result;
 838 }
 839
 840 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 841 {
 842         struct mmc_command cmd = {0};
 843         int err;
 844
 845         cmd.opcode = MMC_SEND_STATUS;
 846         if (!mmc_host_is_spi(card->host))
 847                 cmd.arg = card->rca << 16;
 848         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 849         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 850         if (err == 0)
 851                 *status = cmd.resp[0];
 852         return err;
 853 }
 854
 855 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 856                 bool hw_busy_detect, struct request *req, int *gen_err)
 857 {
 858         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 859         int err = 0;
 860         u32 status;
 861
 862         do {
 863                 err = get_card_status(card, &status, 5);
 864                 if (err) {
 865                         pr_err("%s: error %d requesting status\n",
 866                                req->rq_disk->disk_name, err);
 867                         return err;
 868                 }
 869
 870                 if (status & R1_ERROR) {
 871                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 872                                 req->rq_disk->disk_name, __func__, status);
 873                         *gen_err = 1;
 874                 }
 875
 876                 /* We may rely on the host hw to handle busy detection.*/
 877                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 878                         hw_busy_detect)
 879                         break;
 880
 881                 /*
 882                  * Timeout if the device never becomes ready for data and never
 883                  * leaves the program state.
 884                  */
 885                 if (time_after(jiffies, timeout)) {
 886                         pr_err("%s: Card stuck in programming state! %s %s\n",
 887                                 mmc_hostname(card->host),
 888                                 req->rq_disk->disk_name, __func__);
 889                         return -ETIMEDOUT;
 890                 }
 891
 892                 /*
 893                  * Some cards mishandle the status bits,
 894                  * so make sure to check both the busy
 895                  * indication and the card state.
 896                  */
 897         } while (!(status & R1_READY_FOR_DATA) ||
 898                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 899
 900         return err;
 901 }
 902
 903 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 904                 struct request *req, int *gen_err, u32 *stop_status)
 905 {
 906         struct mmc_host *host = card->host;
 907         struct mmc_command cmd = {0};
 908         int err;
 909         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 910
 911         /*
 912          * Normally we use R1B responses for WRITE, but in cases where the host
 913          * has specified a max_busy_timeout we need to validate it. A failure
 914          * means we need to prevent the host from doing hw busy detection, which
 915          * is done by converting to a R1 response instead.
 916          */
 917         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 918                 use_r1b_resp = false;
 919
 920         cmd.opcode = MMC_STOP_TRANSMISSION;
 921         if (use_r1b_resp) {
 922                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 923                 cmd.busy_timeout = timeout_ms;
 924         } else {
 925                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 926         }
 927
 928         err = mmc_wait_for_cmd(host, &cmd, 5);
 929         if (err)
 930                 return err;
 931
 932         *stop_status = cmd.resp[0];
 933
 934         /* No need to check card status in case of READ. */
 935         if (rq_data_dir(req) == READ)
 936                 return 0;
 937
 938         if (!mmc_host_is_spi(host) &&
 939                 (*stop_status & R1_ERROR)) {
 940                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 941                         req->rq_disk->disk_name, __func__, *stop_status);
 942                 *gen_err = 1;
 943         }
 944
 945         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 946 }
 947
 948 #define ERR_NOMEDIUM    3
 949 #define ERR_RETRY       2
 950 #define ERR_ABORT       1
 951 #define ERR_CONTINUE    0
 952
 953 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 954         bool status_valid, u32 status)
 955 {
 956         switch (error) {
 957         case -EILSEQ:
 958                 /* response crc error, retry the r/w cmd */
 959                 pr_err("%s: %s sending %s command, card status %#x\n",
 960                         req->rq_disk->disk_name, "response CRC error",
 961                         name, status);
 962                 return ERR_RETRY;
 963
 964         case -ETIMEDOUT:
 965                 pr_err("%s: %s sending %s command, card status %#x\n",
 966                         req->rq_disk->disk_name, "timed out", name, status);
 967
 968                 /* If the status cmd initially failed, retry the r/w cmd */
 969                 if (!status_valid) {
 970                         pr_err("%s: status not valid, retrying timeout\n",
 971                                 req->rq_disk->disk_name);
 972                         return ERR_RETRY;
 973                 }
 974
 975                 /*
 976                  * If it was a r/w cmd crc error, or illegal command
 977                  * (eg, issued in wrong state) then retry - we should
 978                  * have corrected the state problem above.
 979                  */
 980                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
 981                         pr_err("%s: command error, retrying timeout\n",
 982                                 req->rq_disk->disk_name);
 983                         return ERR_RETRY;
 984                 }
 985
 986                 /* Otherwise abort the command */
 987                 return ERR_ABORT;
 988
 989         default:
 990                 /* We don't understand the error code the driver gave us */
 991                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 992                        req->rq_disk->disk_name, error, status);
 993                 return ERR_ABORT;
 994         }
 995 }
 996
 997 /*
 998  * Initial r/w and stop cmd error recovery.
 999  * We don't know whether the card received the r/w cmd or not, so try to
1000  * restore things back to a sane state.  Essentially, we do this as follows:
1001  * - Obtain card status.  If the first attempt to obtain card status fails,
1002  *   the status word will reflect the failed status cmd, not the failed
1003  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
1004  *   longer communicate with the card.
1005  * - Check the card state.  If the card received the cmd but there was a
1006  *   transient problem with the response, it might still be in a data transfer
1007  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
1008  * - If the r/w cmd failed due to a response CRC error, it was probably
1009  *   transient, so retry the cmd.
1010  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
1011  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
1012  *   illegal cmd, retry.
1013  * Otherwise we don't understand what happened, so abort.
1014  */
1015 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
1016         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
1017 {
1018         bool prev_cmd_status_valid = true;
1019         u32 status, stop_status = 0;
1020         int err, retry;
1021
1022         if (mmc_card_removed(card))
1023                 return ERR_NOMEDIUM;
1024
1025         /*
1026          * Try to get card status which indicates both the card state
1027          * and why there was no response.  If the first attempt fails,
1028          * we can't be sure the returned status is for the r/w command.
1029          */
1030         for (retry = 2; retry >= 0; retry--) {
1031                 err = get_card_status(card, &status, 0);
1032                 if (!err)
1033                         break;
1034
1035                 /* Re-tune if needed */
1036                 mmc_retune_recheck(card->host);
1037
1038                 prev_cmd_status_valid = false;
1039                 pr_err("%s: error %d sending status command, %sing\n",
1040                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1041         }
1042
1043         /* We couldn't get a response from the card.  Give up. */
1044         if (err) {
1045                 /* Check if the card is removed */
1046                 if (mmc_detect_card_removed(card->host))
1047                         return ERR_NOMEDIUM;
1048                 return ERR_ABORT;
1049         }
1050
1051         /* Flag ECC errors */
1052         if ((status & R1_CARD_ECC_FAILED) ||
1053             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1054             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1055                 *ecc_err = 1;
1056
1057         /* Flag General errors */
1058         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1059                 if ((status & R1_ERROR) ||
1060                         (brq->stop.resp[0] & R1_ERROR)) {
1061                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1062                                req->rq_disk->disk_name, __func__,
1063                                brq->stop.resp[0], status);
1064                         *gen_err = 1;
1065                 }
1066
1067         /*
1068          * Check the current card state.  If it is in some data transfer
1069          * mode, tell it to stop (and hopefully transition back to TRAN.)
1070          */
1071         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1072             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1073                 err = send_stop(card,
1074                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1075                         req, gen_err, &stop_status);
1076                 if (err) {
1077                         pr_err("%s: error %d sending stop command\n",
1078                                req->rq_disk->disk_name, err);
1079                         /*
1080                          * If the stop cmd also timed out, the card is probably
1081                          * not present, so abort. Other errors are bad news too.
1082                          */
1083                         return ERR_ABORT;
1084                 }
1085
1086                 if (stop_status & R1_CARD_ECC_FAILED)
1087                         *ecc_err = 1;
1088         }
1089
1090         /* Check for set block count errors */
1091         if (brq->sbc.error)
1092                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1093                                 prev_cmd_status_valid, status);
1094
1095         /* Check for r/w command errors */
1096         if (brq->cmd.error)
1097                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1098                                 prev_cmd_status_valid, status);
1099
1100         /* Data errors */
1101         if (!brq->stop.error)
1102                 return ERR_CONTINUE;
1103
1104         /* Now for stop errors.  These aren't fatal to the transfer. */
1105         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1106                req->rq_disk->disk_name, brq->stop.error,
1107                brq->cmd.resp[0], status);
1108
1109         /*
1110          * Subsitute in our own stop status as this will give the error
1111          * state which happened during the execution of the r/w command.
1112          */
1113         if (stop_status) {
1114                 brq->stop.resp[0] = stop_status;
1115                 brq->stop.error = 0;
1116         }
1117         return ERR_CONTINUE;
1118 }
1119
1120 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1121                          int type)
1122 {
1123         int err;
1124
1125         if (md->reset_done & type)
1126                 return -EEXIST;
1127
1128         md->reset_done |= type;
1129         err = mmc_hw_reset(host);
1130         /* Ensure we switch back to the correct partition */
1131         if (err != -EOPNOTSUPP) {
1132                 struct mmc_blk_data *main_md =
1133                         dev_get_drvdata(&host->card->dev);
1134                 int part_err;
1135
1136                 main_md->part_curr = main_md->part_type;
1137                 part_err = mmc_blk_part_switch(host->card, md);
1138                 if (part_err) {
1139                         /*
1140                          * We have failed to get back into the correct
1141                          * partition, so we need to abort the whole request.
1142                          */
1143                         return -ENODEV;
1144                 }
1145         }
1146         return err;
1147 }
1148
1149 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1150 {
1151         md->reset_done &= ~type;
1152 }
1153
1154 int mmc_access_rpmb(struct mmc_queue *mq)
1155 {
1156         struct mmc_blk_data *md = mq->data;
1157         /*
1158          * If this is a RPMB partition access, return ture
1159          */
1160         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1161                 return true;
1162
1163         return false;
1164 }
1165
1166 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1167 {
1168         struct mmc_blk_data *md = mq->data;
1169         struct mmc_card *card = md->queue.card;
1170         unsigned int from, nr, arg;
1171         int err = 0, type = MMC_BLK_DISCARD;
1172
1173         if (!mmc_can_erase(card)) {
1174                 err = -EOPNOTSUPP;
1175                 goto out;
1176         }
1177
1178         from = blk_rq_pos(req);
1179         nr = blk_rq_sectors(req);
1180
1181         if (mmc_can_discard(card))
1182                 arg = MMC_DISCARD_ARG;
1183         else if (mmc_can_trim(card))
1184                 arg = MMC_TRIM_ARG;
1185         else
1186                 arg = MMC_ERASE_ARG;
1187 retry:
1188         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1189                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1190                                  INAND_CMD38_ARG_EXT_CSD,
1191                                  arg == MMC_TRIM_ARG ?
1192                                  INAND_CMD38_ARG_TRIM :
1193                                  INAND_CMD38_ARG_ERASE,
1194                                  0);
1195                 if (err)
1196                         goto out;
1197         }
1198         err = mmc_erase(card, from, nr, arg);
1199 out:
1200         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1201                 goto retry;
1202         if (!err)
1203                 mmc_blk_reset_success(md, type);
1204         blk_end_request(req, err, blk_rq_bytes(req));
1205
1206         return err ? 0 : 1;
1207 }
1208
1209 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1210                                        struct request *req)
1211 {
1212         struct mmc_blk_data *md = mq->data;
1213         struct mmc_card *card = md->queue.card;
1214         unsigned int from, nr, arg;
1215         int err = 0, type = MMC_BLK_SECDISCARD;
1216
1217         if (!(mmc_can_secure_erase_trim(card))) {
1218                 err = -EOPNOTSUPP;
1219                 goto out;
1220         }
1221
1222         from = blk_rq_pos(req);
1223         nr = blk_rq_sectors(req);
1224
1225         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1226                 arg = MMC_SECURE_TRIM1_ARG;
1227         else
1228                 arg = MMC_SECURE_ERASE_ARG;
1229
1230 retry:
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                                  arg == MMC_SECURE_TRIM1_ARG ?
1235                                  INAND_CMD38_ARG_SECTRIM1 :
1236                                  INAND_CMD38_ARG_SECERASE,
1237                                  0);
1238                 if (err)
1239                         goto out_retry;
1240         }
1241
1242         err = mmc_erase(card, from, nr, arg);
1243         if (err == -EIO)
1244                 goto out_retry;
1245         if (err)
1246                 goto out;
1247
1248         if (arg == MMC_SECURE_TRIM1_ARG) {
1249                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1250                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1251                                          INAND_CMD38_ARG_EXT_CSD,
1252                                          INAND_CMD38_ARG_SECTRIM2,
1253                                          0);
1254                         if (err)
1255                                 goto out_retry;
1256                 }
1257
1258                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1259                 if (err == -EIO)
1260                         goto out_retry;
1261                 if (err)
1262                         goto out;
1263         }
1264
1265 out_retry:
1266         if (err && !mmc_blk_reset(md, card->host, type))
1267                 goto retry;
1268         if (!err)
1269                 mmc_blk_reset_success(md, type);
1270 out:
1271         blk_end_request(req, err, blk_rq_bytes(req));
1272
1273         return err ? 0 : 1;
1274 }
1275
1276 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1277 {
1278         struct mmc_blk_data *md = mq->data;
1279         struct mmc_card *card = md->queue.card;
1280         int ret = 0;
1281
1282         ret = mmc_flush_cache(card);
1283         if (ret)
1284                 ret = -EIO;
1285
1286         blk_end_request_all(req, ret);
1287
1288         return ret ? 0 : 1;
1289 }
1290
1291 /*
1292  * Reformat current write as a reliable write, supporting
1293  * both legacy and the enhanced reliable write MMC cards.
1294  * In each transfer we'll handle only as much as a single
1295  * reliable write can handle, thus finish the request in
1296  * partial completions.
1297  */
1298 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1299                                     struct mmc_card *card,
1300                                     struct request *req)
1301 {
1302         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1303                 /* Legacy mode imposes restrictions on transfers. */
1304                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1305                         brq->data.blocks = 1;
1306
1307                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1308                         brq->data.blocks = card->ext_csd.rel_sectors;
1309                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1310                         brq->data.blocks = 1;
1311         }
1312 }
1313
1314 #define CMD_ERRORS                                                      \
1315         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1316          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1317          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1318          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1319          R1_CC_ERROR |          /* Card controller error */             \
1320          R1_ERROR)              /* General/unknown error */
1321
1322 static int mmc_blk_err_check(struct mmc_card *card,
1323                              struct mmc_async_req *areq)
1324 {
1325         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1326                                                     mmc_active);
1327         struct mmc_blk_request *brq = &mq_mrq->brq;
1328         struct request *req = mq_mrq->req;
1329         int need_retune = card->host->need_retune;
1330         int ecc_err = 0, gen_err = 0;
1331
1332         /*
1333          * sbc.error indicates a problem with the set block count
1334          * command.  No data will have been transferred.
1335          *
1336          * cmd.error indicates a problem with the r/w command.  No
1337          * data will have been transferred.
1338          *
1339          * stop.error indicates a problem with the stop command.  Data
1340          * may have been transferred, or may still be transferring.
1341          */
1342         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1343             brq->data.error) {
1344                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1345                 case ERR_RETRY:
1346                         return MMC_BLK_RETRY;
1347                 case ERR_ABORT:
1348                         return MMC_BLK_ABORT;
1349                 case ERR_NOMEDIUM:
1350                         return MMC_BLK_NOMEDIUM;
1351                 case ERR_CONTINUE:
1352                         break;
1353                 }
1354         }
1355
1356         /*
1357          * Check for errors relating to the execution of the
1358          * initial command - such as address errors.  No data
1359          * has been transferred.
1360          */
1361         if (brq->cmd.resp[0] & CMD_ERRORS) {
1362                 pr_err("%s: r/w command failed, status = %#x\n",
1363                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1364                 return MMC_BLK_ABORT;
1365         }
1366
1367         /*
1368          * Everything else is either success, or a data error of some
1369          * kind.  If it was a write, we may have transitioned to
1370          * program mode, which we have to wait for it to complete.
1371          */
1372         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1373                 int err;
1374
1375                 /* Check stop command response */
1376                 if (brq->stop.resp[0] & R1_ERROR) {
1377                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1378                                req->rq_disk->disk_name, __func__,
1379                                brq->stop.resp[0]);
1380                         gen_err = 1;
1381                 }
1382
1383                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1384                                         &gen_err);
1385                 if (err)
1386                         return MMC_BLK_CMD_ERR;
1387         }
1388
1389         /* if general error occurs, retry the write operation. */
1390         if (gen_err) {
1391                 pr_warn("%s: retrying write for general error\n",
1392                                 req->rq_disk->disk_name);
1393                 return MMC_BLK_RETRY;
1394         }
1395
1396         if (brq->data.error) {
1397                 if (need_retune && !brq->retune_retry_done) {
1398                         pr_debug("%s: retrying because a re-tune was needed\n",
1399                                  req->rq_disk->disk_name);
1400                         brq->retune_retry_done = 1;
1401                         return MMC_BLK_RETRY;
1402                 }
1403                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1404                        req->rq_disk->disk_name, brq->data.error,
1405                        (unsigned)blk_rq_pos(req),
1406                        (unsigned)blk_rq_sectors(req),
1407                        brq->cmd.resp[0], brq->stop.resp[0]);
1408
1409                 if (rq_data_dir(req) == READ) {
1410                         if (ecc_err)
1411                                 return MMC_BLK_ECC_ERR;
1412                         return MMC_BLK_DATA_ERR;
1413                 } else {
1414                         return MMC_BLK_CMD_ERR;
1415                 }
1416         }
1417
1418         if (!brq->data.bytes_xfered)
1419                 return MMC_BLK_RETRY;
1420
1421         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1422                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1423                         return MMC_BLK_PARTIAL;
1424                 else
1425                         return MMC_BLK_SUCCESS;
1426         }
1427
1428         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1429                 return MMC_BLK_PARTIAL;
1430
1431         return MMC_BLK_SUCCESS;
1432 }
1433
1434 static int mmc_blk_packed_err_check(struct mmc_card *card,
1435                                     struct mmc_async_req *areq)
1436 {
1437         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1438                         mmc_active);
1439         struct request *req = mq_rq->req;
1440         struct mmc_packed *packed = mq_rq->packed;
1441         int err, check, status;
1442         u8 *ext_csd;
1443
1444         packed->retries--;
1445         check = mmc_blk_err_check(card, areq);
1446         err = get_card_status(card, &status, 0);
1447         if (err) {
1448                 pr_err("%s: error %d sending status command\n",
1449                        req->rq_disk->disk_name, err);
1450                 return MMC_BLK_ABORT;
1451         }
1452
1453         if (status & R1_EXCEPTION_EVENT) {
1454                 err = mmc_get_ext_csd(card, &ext_csd);
1455                 if (err) {
1456                         pr_err("%s: error %d sending ext_csd\n",
1457                                req->rq_disk->disk_name, err);
1458                         return MMC_BLK_ABORT;
1459                 }
1460
1461                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1462                      EXT_CSD_PACKED_FAILURE) &&
1463                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1464                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1465                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1466                             EXT_CSD_PACKED_INDEXED_ERROR) {
1467                                 packed->idx_failure =
1468                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1469                                 check = MMC_BLK_PARTIAL;
1470                         }
1471                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1472                                "failure index: %d\n",
1473                                req->rq_disk->disk_name, packed->nr_entries,
1474                                packed->blocks, packed->idx_failure);
1475                 }
1476                 kfree(ext_csd);
1477         }
1478
1479         return check;
1480 }
1481
1482 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1483                                struct mmc_card *card,
1484                                int disable_multi,
1485                                struct mmc_queue *mq)
1486 {
1487         u32 readcmd, writecmd;
1488         struct mmc_blk_request *brq = &mqrq->brq;
1489         struct request *req = mqrq->req;
1490         struct mmc_blk_data *md = mq->data;
1491         bool do_data_tag;
1492
1493         /*
1494          * Reliable writes are used to implement Forced Unit Access and
1495          * are supported only on MMCs.
1496          */
1497         bool do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1498                 (rq_data_dir(req) == WRITE) &&
1499                 (md->flags & MMC_BLK_REL_WR);
1500
1501         memset(brq, 0, sizeof(struct mmc_blk_request));
1502         brq->mrq.cmd = &brq->cmd;
1503         brq->mrq.data = &brq->data;
1504
1505         brq->cmd.arg = blk_rq_pos(req);
1506         if (!mmc_card_blockaddr(card))
1507                 brq->cmd.arg <<= 9;
1508         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1509         brq->data.blksz = 512;
1510         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1511         brq->stop.arg = 0;
1512         brq->data.blocks = blk_rq_sectors(req);
1513
1514         /*
1515          * The block layer doesn't support all sector count
1516          * restrictions, so we need to be prepared for too big
1517          * requests.
1518          */
1519         if (brq->data.blocks > card->host->max_blk_count)
1520                 brq->data.blocks = card->host->max_blk_count;
1521
1522         if (brq->data.blocks > 1) {
1523                 /*
1524                  * After a read error, we redo the request one sector
1525                  * at a time in order to accurately determine which
1526                  * sectors can be read successfully.
1527                  */
1528                 if (disable_multi)
1529                         brq->data.blocks = 1;
1530
1531                 /*
1532                  * Some controllers have HW issues while operating
1533                  * in multiple I/O mode
1534                  */
1535                 if (card->host->ops->multi_io_quirk)
1536                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1537                                                 (rq_data_dir(req) == READ) ?
1538                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1539                                                 brq->data.blocks);
1540         }
1541
1542         if (brq->data.blocks > 1 || do_rel_wr) {
1543                 /* SPI multiblock writes terminate using a special
1544                  * token, not a STOP_TRANSMISSION request.
1545                  */
1546                 if (!mmc_host_is_spi(card->host) ||
1547                     rq_data_dir(req) == READ)
1548                         brq->mrq.stop = &brq->stop;
1549                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1550                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1551         } else {
1552                 brq->mrq.stop = NULL;
1553                 readcmd = MMC_READ_SINGLE_BLOCK;
1554                 writecmd = MMC_WRITE_BLOCK;
1555         }
1556         if (rq_data_dir(req) == READ) {
1557                 brq->cmd.opcode = readcmd;
1558                 brq->data.flags = MMC_DATA_READ;
1559                 if (brq->mrq.stop)
1560                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1561                                         MMC_CMD_AC;
1562         } else {
1563                 brq->cmd.opcode = writecmd;
1564                 brq->data.flags = MMC_DATA_WRITE;
1565                 if (brq->mrq.stop)
1566                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1567                                         MMC_CMD_AC;
1568         }
1569
1570         if (do_rel_wr)
1571                 mmc_apply_rel_rw(brq, card, req);
1572
1573         /*
1574          * Data tag is used only during writing meta data to speed
1575          * up write and any subsequent read of this meta data
1576          */
1577         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1578                 (req->cmd_flags & REQ_META) &&
1579                 (rq_data_dir(req) == WRITE) &&
1580                 ((brq->data.blocks * brq->data.blksz) >=
1581                  card->ext_csd.data_tag_unit_size);
1582
1583         /*
1584          * Pre-defined multi-block transfers are preferable to
1585          * open ended-ones (and necessary for reliable writes).
1586          * However, it is not sufficient to just send CMD23,
1587          * and avoid the final CMD12, as on an error condition
1588          * CMD12 (stop) needs to be sent anyway. This, coupled
1589          * with Auto-CMD23 enhancements provided by some
1590          * hosts, means that the complexity of dealing
1591          * with this is best left to the host. If CMD23 is
1592          * supported by card and host, we'll fill sbc in and let
1593          * the host deal with handling it correctly. This means
1594          * that for hosts that don't expose MMC_CAP_CMD23, no
1595          * change of behavior will be observed.
1596          *
1597          * N.B: Some MMC cards experience perf degradation.
1598          * We'll avoid using CMD23-bounded multiblock writes for
1599          * these, while retaining features like reliable writes.
1600          */
1601         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1602             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1603              do_data_tag)) {
1604                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1605                 brq->sbc.arg = brq->data.blocks |
1606                         (do_rel_wr ? (1 << 31) : 0) |
1607                         (do_data_tag ? (1 << 29) : 0);
1608                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1609                 brq->mrq.sbc = &brq->sbc;
1610         }
1611
1612         mmc_set_data_timeout(&brq->data, card);
1613
1614         brq->data.sg = mqrq->sg;
1615         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1616
1617         /*
1618          * Adjust the sg list so it is the same size as the
1619          * request.
1620          */
1621         if (brq->data.blocks != blk_rq_sectors(req)) {
1622                 int i, data_size = brq->data.blocks << 9;
1623                 struct scatterlist *sg;
1624
1625                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1626                         data_size -= sg->length;
1627                         if (data_size <= 0) {
1628                                 sg->length += data_size;
1629                                 i++;
1630                                 break;
1631                         }
1632                 }
1633                 brq->data.sg_len = i;
1634         }
1635
1636         mqrq->mmc_active.mrq = &brq->mrq;
1637         mqrq->mmc_active.err_check = mmc_blk_err_check;
1638
1639         mmc_queue_bounce_pre(mqrq);
1640 }
1641
1642 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1643                                           struct mmc_card *card)
1644 {
1645         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1646         unsigned int max_seg_sz = queue_max_segment_size(q);
1647         unsigned int len, nr_segs = 0;
1648
1649         do {
1650                 len = min(hdr_sz, max_seg_sz);
1651                 hdr_sz -= len;
1652                 nr_segs++;
1653         } while (hdr_sz);
1654
1655         return nr_segs;
1656 }
1657
1658 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1659 {
1660         struct request_queue *q = mq->queue;
1661         struct mmc_card *card = mq->card;
1662         struct request *cur = req, *next = NULL;
1663         struct mmc_blk_data *md = mq->data;
1664         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1665         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1666         unsigned int req_sectors = 0, phys_segments = 0;
1667         unsigned int max_blk_count, max_phys_segs;
1668         bool put_back = true;
1669         u8 max_packed_rw = 0;
1670         u8 reqs = 0;
1671
1672         /*
1673          * We don't need to check packed for any further
1674          * operation of packed stuff as we set MMC_PACKED_NONE
1675          * and return zero for reqs if geting null packed. Also
1676          * we clean the flag of MMC_BLK_PACKED_CMD to avoid doing
1677          * it again when removing blk req.
1678          */
1679         if (!mqrq->packed) {
1680                 md->flags &= (~MMC_BLK_PACKED_CMD);
1681                 goto no_packed;
1682         }
1683
1684         if (!(md->flags & MMC_BLK_PACKED_CMD))
1685                 goto no_packed;
1686
1687         if ((rq_data_dir(cur) == WRITE) &&
1688             mmc_host_packed_wr(card->host))
1689                 max_packed_rw = card->ext_csd.max_packed_writes;
1690
1691         if (max_packed_rw == 0)
1692                 goto no_packed;
1693
1694         if (mmc_req_rel_wr(cur) &&
1695             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1696                 goto no_packed;
1697
1698         if (mmc_large_sector(card) &&
1699             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1700                 goto no_packed;
1701
1702         mmc_blk_clear_packed(mqrq);
1703
1704         max_blk_count = min(card->host->max_blk_count,
1705                             card->host->max_req_size >> 9);
1706         if (unlikely(max_blk_count > 0xffff))
1707                 max_blk_count = 0xffff;
1708
1709         max_phys_segs = queue_max_segments(q);
1710         req_sectors += blk_rq_sectors(cur);
1711         phys_segments += cur->nr_phys_segments;
1712
1713         if (rq_data_dir(cur) == WRITE) {
1714                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1715                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1716         }
1717
1718         do {
1719                 if (reqs >= max_packed_rw - 1) {
1720                         put_back = false;
1721                         break;
1722                 }
1723
1724                 spin_lock_irq(q->queue_lock);
1725                 next = blk_fetch_request(q);
1726                 spin_unlock_irq(q->queue_lock);
1727                 if (!next) {
1728                         put_back = false;
1729                         break;
1730                 }
1731
1732                 if (mmc_large_sector(card) &&
1733                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1734                         break;
1735
1736                 if (req_op(next) == REQ_OP_DISCARD ||
1737                     req_op(next) == REQ_OP_SECURE_ERASE ||
1738                     req_op(next) == REQ_OP_FLUSH)
1739                         break;
1740
1741                 if (rq_data_dir(cur) != rq_data_dir(next))
1742                         break;
1743
1744                 if (mmc_req_rel_wr(next) &&
1745                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1746                         break;
1747
1748                 req_sectors += blk_rq_sectors(next);
1749                 if (req_sectors > max_blk_count)
1750                         break;
1751
1752                 phys_segments +=  next->nr_phys_segments;
1753                 if (phys_segments > max_phys_segs)
1754                         break;
1755
1756                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1757                 cur = next;
1758                 reqs++;
1759         } while (1);
1760
1761         if (put_back) {
1762                 spin_lock_irq(q->queue_lock);
1763                 blk_requeue_request(q, next);
1764                 spin_unlock_irq(q->queue_lock);
1765         }
1766
1767         if (reqs > 0) {
1768                 list_add(&req->queuelist, &mqrq->packed->list);
1769                 mqrq->packed->nr_entries = ++reqs;
1770                 mqrq->packed->retries = reqs;
1771                 return reqs;
1772         }
1773
1774 no_packed:
1775         mqrq->cmd_type = MMC_PACKED_NONE;
1776         return 0;
1777 }
1778
1779 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1780                                         struct mmc_card *card,
1781                                         struct mmc_queue *mq)
1782 {
1783         struct mmc_blk_request *brq = &mqrq->brq;
1784         struct request *req = mqrq->req;
1785         struct request *prq;
1786         struct mmc_blk_data *md = mq->data;
1787         struct mmc_packed *packed = mqrq->packed;
1788         bool do_rel_wr, do_data_tag;
1789         u32 *packed_cmd_hdr;
1790         u8 hdr_blocks;
1791         u8 i = 1;
1792
1793         mqrq->cmd_type = MMC_PACKED_WRITE;
1794         packed->blocks = 0;
1795         packed->idx_failure = MMC_PACKED_NR_IDX;
1796
1797         packed_cmd_hdr = packed->cmd_hdr;
1798         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1799         packed_cmd_hdr[0] = cpu_to_le32((packed->nr_entries << 16) |
1800                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER);
1801         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1802
1803         /*
1804          * Argument for each entry of packed group
1805          */
1806         list_for_each_entry(prq, &packed->list, queuelist) {
1807                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1808                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1809                         (prq->cmd_flags & REQ_META) &&
1810                         (rq_data_dir(prq) == WRITE) &&
1811                         blk_rq_bytes(prq) >= card->ext_csd.data_tag_unit_size;
1812                 /* Argument of CMD23 */
1813                 packed_cmd_hdr[(i * 2)] = cpu_to_le32(
1814                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1815                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1816                         blk_rq_sectors(prq));
1817                 /* Argument of CMD18 or CMD25 */
1818                 packed_cmd_hdr[((i * 2)) + 1] = cpu_to_le32(
1819                         mmc_card_blockaddr(card) ?
1820                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9);
1821                 packed->blocks += blk_rq_sectors(prq);
1822                 i++;
1823         }
1824
1825         memset(brq, 0, sizeof(struct mmc_blk_request));
1826         brq->mrq.cmd = &brq->cmd;
1827         brq->mrq.data = &brq->data;
1828         brq->mrq.sbc = &brq->sbc;
1829         brq->mrq.stop = &brq->stop;
1830
1831         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1832         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1833         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1834
1835         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1836         brq->cmd.arg = blk_rq_pos(req);
1837         if (!mmc_card_blockaddr(card))
1838                 brq->cmd.arg <<= 9;
1839         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1840
1841         brq->data.blksz = 512;
1842         brq->data.blocks = packed->blocks + hdr_blocks;
1843         brq->data.flags = MMC_DATA_WRITE;
1844
1845         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1846         brq->stop.arg = 0;
1847         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1848
1849         mmc_set_data_timeout(&brq->data, card);
1850
1851         brq->data.sg = mqrq->sg;
1852         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1853
1854         mqrq->mmc_active.mrq = &brq->mrq;
1855         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1856
1857         mmc_queue_bounce_pre(mqrq);
1858 }
1859
1860 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1861                            struct mmc_blk_request *brq, struct request *req,
1862                            int ret)
1863 {
1864         struct mmc_queue_req *mq_rq;
1865         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1866
1867         /*
1868          * If this is an SD card and we're writing, we can first
1869          * mark the known good sectors as ok.
1870          *
1871          * If the card is not SD, we can still ok written sectors
1872          * as reported by the controller (which might be less than
1873          * the real number of written sectors, but never more).
1874          */
1875         if (mmc_card_sd(card)) {
1876                 u32 blocks;
1877
1878                 blocks = mmc_sd_num_wr_blocks(card);
1879                 if (blocks != (u32)-1) {
1880                         ret = blk_end_request(req, 0, blocks << 9);
1881                 }
1882         } else {
1883                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1884                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1885         }
1886         return ret;
1887 }
1888
1889 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1890 {
1891         struct request *prq;
1892         struct mmc_packed *packed = mq_rq->packed;
1893         int idx = packed->idx_failure, i = 0;
1894         int ret = 0;
1895
1896         while (!list_empty(&packed->list)) {
1897                 prq = list_entry_rq(packed->list.next);
1898                 if (idx == i) {
1899                         /* retry from error index */
1900                         packed->nr_entries -= idx;
1901                         mq_rq->req = prq;
1902                         ret = 1;
1903
1904                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1905                                 list_del_init(&prq->queuelist);
1906                                 mmc_blk_clear_packed(mq_rq);
1907                         }
1908                         return ret;
1909                 }
1910                 list_del_init(&prq->queuelist);
1911                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1912                 i++;
1913         }
1914
1915         mmc_blk_clear_packed(mq_rq);
1916         return ret;
1917 }
1918
1919 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1920 {
1921         struct request *prq;
1922         struct mmc_packed *packed = mq_rq->packed;
1923
1924         while (!list_empty(&packed->list)) {
1925                 prq = list_entry_rq(packed->list.next);
1926                 list_del_init(&prq->queuelist);
1927                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1928         }
1929
1930         mmc_blk_clear_packed(mq_rq);
1931 }
1932
1933 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1934                                       struct mmc_queue_req *mq_rq)
1935 {
1936         struct request *prq;
1937         struct request_queue *q = mq->queue;
1938         struct mmc_packed *packed = mq_rq->packed;
1939
1940         while (!list_empty(&packed->list)) {
1941                 prq = list_entry_rq(packed->list.prev);
1942                 if (prq->queuelist.prev != &packed->list) {
1943                         list_del_init(&prq->queuelist);
1944                         spin_lock_irq(q->queue_lock);
1945                         blk_requeue_request(mq->queue, prq);
1946                         spin_unlock_irq(q->queue_lock);
1947                 } else {
1948                         list_del_init(&prq->queuelist);
1949                 }
1950         }
1951
1952         mmc_blk_clear_packed(mq_rq);
1953 }
1954
1955 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1956 {
1957         struct mmc_blk_data *md = mq->data;
1958         struct mmc_card *card = md->queue.card;
1959         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1960         int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1961         enum mmc_blk_status status;
1962         struct mmc_queue_req *mq_rq;
1963         struct request *req = rqc;
1964         struct mmc_async_req *areq;
1965         const u8 packed_nr = 2;
1966         u8 reqs = 0;
1967
1968         if (!rqc && !mq->mqrq_prev->req)
1969                 return 0;
1970
1971         if (rqc)
1972                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1973
1974         do {
1975                 if (rqc) {
1976                         /*
1977                          * When 4KB native sector is enabled, only 8 blocks
1978                          * multiple read or write is allowed
1979                          */
1980                         if (mmc_large_sector(card) &&
1981                                 !IS_ALIGNED(blk_rq_sectors(rqc), 8)) {
1982                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1983                                         req->rq_disk->disk_name);
1984                                 mq_rq = mq->mqrq_cur;
1985                                 goto cmd_abort;
1986                         }
1987
1988                         if (reqs >= packed_nr)
1989                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1990                                                             card, mq);
1991                         else
1992                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1993                         areq = &mq->mqrq_cur->mmc_active;
1994                 } else
1995                         areq = NULL;
1996                 areq = mmc_start_req(card->host, areq, (int *) &status);
1997                 if (!areq) {
1998                         if (status == MMC_BLK_NEW_REQUEST)
1999                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
2000                         return 0;
2001                 }
2002
2003                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
2004                 brq = &mq_rq->brq;
2005                 req = mq_rq->req;
2006                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
2007                 mmc_queue_bounce_post(mq_rq);
2008
2009                 switch (status) {
2010                 case MMC_BLK_SUCCESS:
2011                 case MMC_BLK_PARTIAL:
2012                         /*
2013                          * A block was successfully transferred.
2014                          */
2015                         mmc_blk_reset_success(md, type);
2016
2017                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2018                                 ret = mmc_blk_end_packed_req(mq_rq);
2019                                 break;
2020                         } else {
2021                                 ret = blk_end_request(req, 0,
2022                                                 brq->data.bytes_xfered);
2023                         }
2024
2025                         /*
2026                          * If the blk_end_request function returns non-zero even
2027                          * though all data has been transferred and no errors
2028                          * were returned by the host controller, it's a bug.
2029                          */
2030                         if (status == MMC_BLK_SUCCESS && ret) {
2031                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
2032                                        __func__, blk_rq_bytes(req),
2033                                        brq->data.bytes_xfered);
2034                                 rqc = NULL;
2035                                 goto cmd_abort;
2036                         }
2037                         break;
2038                 case MMC_BLK_CMD_ERR:
2039                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
2040                         if (mmc_blk_reset(md, card->host, type))
2041                                 goto cmd_abort;
2042                         if (!ret)
2043                                 goto start_new_req;
2044                         break;
2045                 case MMC_BLK_RETRY:
2046                         retune_retry_done = brq->retune_retry_done;
2047                         if (retry++ < 5)
2048                                 break;
2049                         /* Fall through */
2050                 case MMC_BLK_ABORT:
2051                         if (!mmc_blk_reset(md, card->host, type))
2052                                 break;
2053                         goto cmd_abort;
2054                 case MMC_BLK_DATA_ERR: {
2055                         int err;
2056
2057                         err = mmc_blk_reset(md, card->host, type);
2058                         if (!err)
2059                                 break;
2060                         if (err == -ENODEV ||
2061                                 mmc_packed_cmd(mq_rq->cmd_type))
2062                                 goto cmd_abort;
2063                         /* Fall through */
2064                 }
2065                 case MMC_BLK_ECC_ERR:
2066                         if (brq->data.blocks > 1) {
2067                                 /* Redo read one sector at a time */
2068                                 pr_warn("%s: retrying using single block read\n",
2069                                         req->rq_disk->disk_name);
2070                                 disable_multi = 1;
2071                                 break;
2072                         }
2073                         /*
2074                          * After an error, we redo I/O one sector at a
2075                          * time, so we only reach here after trying to
2076                          * read a single sector.
2077                          */
2078                         ret = blk_end_request(req, -EIO,
2079                                                 brq->data.blksz);
2080                         if (!ret)
2081                                 goto start_new_req;
2082                         break;
2083                 case MMC_BLK_NOMEDIUM:
2084                         goto cmd_abort;
2085                 default:
2086                         pr_err("%s: Unhandled return value (%d)",
2087                                         req->rq_disk->disk_name, status);
2088                         goto cmd_abort;
2089                 }
2090
2091                 if (ret) {
2092                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2093                                 if (!mq_rq->packed->retries)
2094                                         goto cmd_abort;
2095                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
2096                                 mmc_start_req(card->host,
2097                                               &mq_rq->mmc_active, NULL);
2098                         } else {
2099
2100                                 /*
2101                                  * In case of a incomplete request
2102                                  * prepare it again and resend.
2103                                  */
2104                                 mmc_blk_rw_rq_prep(mq_rq, card,
2105                                                 disable_multi, mq);
2106                                 mmc_start_req(card->host,
2107                                                 &mq_rq->mmc_active, NULL);
2108                         }
2109                         mq_rq->brq.retune_retry_done = retune_retry_done;
2110                 }
2111         } while (ret);
2112
2113         return 1;
2114
2115  cmd_abort:
2116         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2117                 mmc_blk_abort_packed_req(mq_rq);
2118         } else {
2119                 if (mmc_card_removed(card))
2120                         req->cmd_flags |= REQ_QUIET;
2121                 while (ret)
2122                         ret = blk_end_request(req, -EIO,
2123                                         blk_rq_cur_bytes(req));
2124         }
2125
2126  start_new_req:
2127         if (rqc) {
2128                 if (mmc_card_removed(card)) {
2129                         rqc->cmd_flags |= REQ_QUIET;
2130                         blk_end_request_all(rqc, -EIO);
2131                 } else {
2132                         /*
2133                          * If current request is packed, it needs to put back.
2134                          */
2135                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2136                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2137
2138                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2139                         mmc_start_req(card->host,
2140                                       &mq->mqrq_cur->mmc_active, NULL);
2141                 }
2142         }
2143
2144         return 0;
2145 }
2146
2147 int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2148 {
2149         int ret;
2150         struct mmc_blk_data *md = mq->data;
2151         struct mmc_card *card = md->queue.card;
2152         struct mmc_host *host = card->host;
2153         unsigned long flags;
2154         bool req_is_special = mmc_req_is_special(req);
2155
2156         if (req && !mq->mqrq_prev->req)
2157                 /* claim host only for the first request */
2158                 mmc_get_card(card);
2159
2160         ret = mmc_blk_part_switch(card, md);
2161         if (ret) {
2162                 if (req) {
2163                         blk_end_request_all(req, -EIO);
2164                 }
2165                 ret = 0;
2166                 goto out;
2167         }
2168
2169         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2170         if (req && req_op(req) == REQ_OP_DISCARD) {
2171                 /* complete ongoing async transfer before issuing discard */
2172                 if (card->host->areq)
2173                         mmc_blk_issue_rw_rq(mq, NULL);
2174                 ret = mmc_blk_issue_discard_rq(mq, req);
2175         } else if (req && req_op(req) == REQ_OP_SECURE_ERASE) {
2176                 /* complete ongoing async transfer before issuing secure erase*/
2177                 if (card->host->areq)
2178                         mmc_blk_issue_rw_rq(mq, NULL);
2179                 ret = mmc_blk_issue_secdiscard_rq(mq, req);
2180         } else if (req && req_op(req) == REQ_OP_FLUSH) {
2181                 /* complete ongoing async transfer before issuing flush */
2182                 if (card->host->areq)
2183                         mmc_blk_issue_rw_rq(mq, NULL);
2184                 ret = mmc_blk_issue_flush(mq, req);
2185         } else {
2186                 if (!req && host->areq) {
2187                         spin_lock_irqsave(&host->context_info.lock, flags);
2188                         host->context_info.is_waiting_last_req = true;
2189                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2190                 }
2191                 ret = mmc_blk_issue_rw_rq(mq, req);
2192         }
2193
2194 out:
2195         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) || req_is_special)
2196                 /*
2197                  * Release host when there are no more requests
2198                  * and after special request(discard, flush) is done.
2199                  * In case sepecial request, there is no reentry to
2200                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2201                  */
2202                 mmc_put_card(card);
2203         return ret;
2204 }
2205
2206 static inline int mmc_blk_readonly(struct mmc_card *card)
2207 {
2208         return mmc_card_readonly(card) ||
2209                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2210 }
2211
2212 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2213                                               struct device *parent,
2214                                               sector_t size,
2215                                               bool default_ro,
2216                                               const char *subname,
2217                                               int area_type)
2218 {
2219         struct mmc_blk_data *md;
2220         int devidx, ret;
2221
2222 again:
2223         if (!ida_pre_get(&mmc_blk_ida, GFP_KERNEL))
2224                 return ERR_PTR(-ENOMEM);
2225
2226         spin_lock(&mmc_blk_lock);
2227         ret = ida_get_new(&mmc_blk_ida, &devidx);
2228         spin_unlock(&mmc_blk_lock);
2229
2230         if (ret == -EAGAIN)
2231                 goto again;
2232         else if (ret)
2233                 return ERR_PTR(ret);
2234
2235         if (devidx >= max_devices) {
2236                 ret = -ENOSPC;
2237                 goto out;
2238         }
2239
2240         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2241         if (!md) {
2242                 ret = -ENOMEM;
2243                 goto out;
2244         }
2245
2246         md->area_type = area_type;
2247
2248         /*
2249          * Set the read-only status based on the supported commands
2250          * and the write protect switch.
2251          */
2252         md->read_only = mmc_blk_readonly(card);
2253
2254         md->disk = alloc_disk(perdev_minors);
2255         if (md->disk == NULL) {
2256                 ret = -ENOMEM;
2257                 goto err_kfree;
2258         }
2259
2260         spin_lock_init(&md->lock);
2261         INIT_LIST_HEAD(&md->part);
2262         md->usage = 1;
2263
2264         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2265         if (ret)
2266                 goto err_putdisk;
2267
2268         md->queue.data = md;
2269
2270         md->disk->major = MMC_BLOCK_MAJOR;
2271         md->disk->first_minor = devidx * perdev_minors;
2272         md->disk->fops = &mmc_bdops;
2273         md->disk->private_data = md;
2274         md->disk->queue = md->queue.queue;
2275         md->parent = parent;
2276         set_disk_ro(md->disk, md->read_only || default_ro);
2277         md->disk->flags = GENHD_FL_EXT_DEVT;
2278         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2279                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2280
2281         /*
2282          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2283          *
2284          * - be set for removable media with permanent block devices
2285          * - be unset for removable block devices with permanent media
2286          *
2287          * Since MMC block devices clearly fall under the second
2288          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2289          * should use the block device creation/destruction hotplug
2290          * messages to tell when the card is present.
2291          */
2292
2293         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2294                  "mmcblk%u%s", card->host->index, subname ? subname : "");
2295
2296         if (mmc_card_mmc(card))
2297                 blk_queue_logical_block_size(md->queue.queue,
2298                                              card->ext_csd.data_sector_size);
2299         else
2300                 blk_queue_logical_block_size(md->queue.queue, 512);
2301
2302         set_capacity(md->disk, size);
2303
2304         if (mmc_host_cmd23(card->host)) {
2305                 if ((mmc_card_mmc(card) &&
2306                      card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
2307                     (mmc_card_sd(card) &&
2308                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2309                         md->flags |= MMC_BLK_CMD23;
2310         }
2311
2312         if (mmc_card_mmc(card) &&
2313             md->flags & MMC_BLK_CMD23 &&
2314             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2315              card->ext_csd.rel_sectors)) {
2316                 md->flags |= MMC_BLK_REL_WR;
2317                 blk_queue_write_cache(md->queue.queue, true, true);
2318         }
2319
2320         if (mmc_card_mmc(card) &&
2321             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2322             (md->flags & MMC_BLK_CMD23) &&
2323             card->ext_csd.packed_event_en) {
2324                 if (!mmc_packed_init(&md->queue, card))
2325                         md->flags |= MMC_BLK_PACKED_CMD;
2326         }
2327
2328         return md;
2329
2330  err_putdisk:
2331         put_disk(md->disk);
2332  err_kfree:
2333         kfree(md);
2334  out:
2335         spin_lock(&mmc_blk_lock);
2336         ida_remove(&mmc_blk_ida, devidx);
2337         spin_unlock(&mmc_blk_lock);
2338         return ERR_PTR(ret);
2339 }
2340
2341 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2342 {
2343         sector_t size;
2344
2345         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2346                 /*
2347                  * The EXT_CSD sector count is in number or 512 byte
2348                  * sectors.
2349                  */
2350                 size = card->ext_csd.sectors;
2351         } else {
2352                 /*
2353                  * The CSD capacity field is in units of read_blkbits.
2354                  * set_capacity takes units of 512 bytes.
2355                  */
2356                 size = (typeof(sector_t))card->csd.capacity
2357                         << (card->csd.read_blkbits - 9);
2358         }
2359
2360         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2361                                         MMC_BLK_DATA_AREA_MAIN);
2362 }
2363
2364 static int mmc_blk_alloc_part(struct mmc_card *card,
2365                               struct mmc_blk_data *md,
2366                               unsigned int part_type,
2367                               sector_t size,
2368                               bool default_ro,
2369                               const char *subname,
2370                               int area_type)
2371 {
2372         char cap_str[10];
2373         struct mmc_blk_data *part_md;
2374
2375         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2376                                     subname, area_type);
2377         if (IS_ERR(part_md))
2378                 return PTR_ERR(part_md);
2379         part_md->part_type = part_type;
2380         list_add(&part_md->part, &md->part);
2381
2382         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2383                         cap_str, sizeof(cap_str));
2384         pr_info("%s: %s %s partition %u %s\n",
2385                part_md->disk->disk_name, mmc_card_id(card),
2386                mmc_card_name(card), part_md->part_type, cap_str);
2387         return 0;
2388 }
2389
2390 /* MMC Physical partitions consist of two boot partitions and
2391  * up to four general purpose partitions.
2392  * For each partition enabled in EXT_CSD a block device will be allocatedi
2393  * to provide access to the partition.
2394  */
2395
2396 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2397 {
2398         int idx, ret = 0;
2399
2400         if (!mmc_card_mmc(card))
2401                 return 0;
2402
2403         for (idx = 0; idx < card->nr_parts; idx++) {
2404                 if (card->part[idx].size) {
2405                         ret = mmc_blk_alloc_part(card, md,
2406                                 card->part[idx].part_cfg,
2407                                 card->part[idx].size >> 9,
2408                                 card->part[idx].force_ro,
2409                                 card->part[idx].name,
2410                                 card->part[idx].area_type);
2411                         if (ret)
2412                                 return ret;
2413                 }
2414         }
2415
2416         return ret;
2417 }
2418
2419 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2420 {
2421         struct mmc_card *card;
2422
2423         if (md) {
2424                 /*
2425                  * Flush remaining requests and free queues. It
2426                  * is freeing the queue that stops new requests
2427                  * from being accepted.
2428                  */
2429                 card = md->queue.card;
2430                 mmc_cleanup_queue(&md->queue);
2431                 if (md->flags & MMC_BLK_PACKED_CMD)
2432                         mmc_packed_clean(&md->queue);
2433                 if (md->disk->flags & GENHD_FL_UP) {
2434                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2435                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2436                                         card->ext_csd.boot_ro_lockable)
2437                                 device_remove_file(disk_to_dev(md->disk),
2438                                         &md->power_ro_lock);
2439
2440                         del_gendisk(md->disk);
2441                 }
2442                 mmc_blk_put(md);
2443         }
2444 }
2445
2446 static void mmc_blk_remove_parts(struct mmc_card *card,
2447                                  struct mmc_blk_data *md)
2448 {
2449         struct list_head *pos, *q;
2450         struct mmc_blk_data *part_md;
2451
2452         list_for_each_safe(pos, q, &md->part) {
2453                 part_md = list_entry(pos, struct mmc_blk_data, part);
2454                 list_del(pos);
2455                 mmc_blk_remove_req(part_md);
2456         }
2457 }
2458
2459 static int mmc_add_disk(struct mmc_blk_data *md)
2460 {
2461         int ret;
2462         struct mmc_card *card = md->queue.card;
2463
2464         device_add_disk(md->parent, md->disk);
2465         md->force_ro.show = force_ro_show;
2466         md->force_ro.store = force_ro_store;
2467         sysfs_attr_init(&md->force_ro.attr);
2468         md->force_ro.attr.name = "force_ro";
2469         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2470         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2471         if (ret)
2472                 goto force_ro_fail;
2473
2474         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2475              card->ext_csd.boot_ro_lockable) {
2476                 umode_t mode;
2477
2478                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2479                         mode = S_IRUGO;
2480                 else
2481                         mode = S_IRUGO | S_IWUSR;
2482
2483                 md->power_ro_lock.show = power_ro_lock_show;
2484                 md->power_ro_lock.store = power_ro_lock_store;
2485                 sysfs_attr_init(&md->power_ro_lock.attr);
2486                 md->power_ro_lock.attr.mode = mode;
2487                 md->power_ro_lock.attr.name =
2488                                         "ro_lock_until_next_power_on";
2489                 ret = device_create_file(disk_to_dev(md->disk),
2490                                 &md->power_ro_lock);
2491                 if (ret)
2492                         goto power_ro_lock_fail;
2493         }
2494         return ret;
2495
2496 power_ro_lock_fail:
2497         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2498 force_ro_fail:
2499         del_gendisk(md->disk);
2500
2501         return ret;
2502 }
2503
2504 static const struct mmc_fixup blk_fixups[] =
2505 {
2506         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2507                   MMC_QUIRK_INAND_CMD38),
2508         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2509                   MMC_QUIRK_INAND_CMD38),
2510         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2511                   MMC_QUIRK_INAND_CMD38),
2512         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2513                   MMC_QUIRK_INAND_CMD38),
2514         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2515                   MMC_QUIRK_INAND_CMD38),
2516
2517         /*
2518          * Some MMC cards experience performance degradation with CMD23
2519          * instead of CMD12-bounded multiblock transfers. For now we'll
2520          * black list what's bad...
2521          * - Certain Toshiba cards.
2522          *
2523          * N.B. This doesn't affect SD cards.
2524          */
2525         MMC_FIXUP("SDMB-32", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2526                   MMC_QUIRK_BLK_NO_CMD23),
2527         MMC_FIXUP("SDM032", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2528                   MMC_QUIRK_BLK_NO_CMD23),
2529         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2530                   MMC_QUIRK_BLK_NO_CMD23),
2531         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2532                   MMC_QUIRK_BLK_NO_CMD23),
2533         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2534                   MMC_QUIRK_BLK_NO_CMD23),
2535
2536         /*
2537          * Some MMC cards need longer data read timeout than indicated in CSD.
2538          */
2539         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2540                   MMC_QUIRK_LONG_READ_TIME),
2541         MMC_FIXUP("008GE0", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2542                   MMC_QUIRK_LONG_READ_TIME),
2543
2544         /*
2545          * On these Samsung MoviNAND parts, performing secure erase or
2546          * secure trim can result in unrecoverable corruption due to a
2547          * firmware bug.
2548          */
2549         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2550                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2551         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2552                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2553         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2554                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2555         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2556                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2557         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2558                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2559         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2560                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2561         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2562                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2563         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2564                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2565
2566         /*
2567          *  On Some Kingston eMMCs, performing trim can result in
2568          *  unrecoverable data conrruption occasionally due to a firmware bug.
2569          */
2570         MMC_FIXUP("V10008", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2571                   MMC_QUIRK_TRIM_BROKEN),
2572         MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2573                   MMC_QUIRK_TRIM_BROKEN),
2574
2575         END_FIXUP
2576 };
2577
2578 static int mmc_blk_probe(struct mmc_card *card)
2579 {
2580         struct mmc_blk_data *md, *part_md;
2581         char cap_str[10];
2582
2583         /*
2584          * Check that the card supports the command class(es) we need.
2585          */
2586         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2587                 return -ENODEV;
2588
2589         mmc_fixup_device(card, blk_fixups);
2590
2591         md = mmc_blk_alloc(card);
2592         if (IS_ERR(md))
2593                 return PTR_ERR(md);
2594
2595         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2596                         cap_str, sizeof(cap_str));
2597         pr_info("%s: %s %s %s %s\n",
2598                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2599                 cap_str, md->read_only ? "(ro)" : "");
2600
2601         if (mmc_blk_alloc_parts(card, md))
2602                 goto out;
2603
2604         dev_set_drvdata(&card->dev, md);
2605
2606         if (mmc_add_disk(md))
2607                 goto out;
2608
2609         list_for_each_entry(part_md, &md->part, part) {
2610                 if (mmc_add_disk(part_md))
2611                         goto out;
2612         }
2613
2614         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2615         pm_runtime_use_autosuspend(&card->dev);
2616
2617         /*
2618          * Don't enable runtime PM for SD-combo cards here. Leave that
2619          * decision to be taken during the SDIO init sequence instead.
2620          */
2621         if (card->type != MMC_TYPE_SD_COMBO) {
2622                 pm_runtime_set_active(&card->dev);
2623                 pm_runtime_enable(&card->dev);
2624         }
2625
2626         return 0;
2627
2628  out:
2629         mmc_blk_remove_parts(card, md);
2630         mmc_blk_remove_req(md);
2631         return 0;
2632 }
2633
2634 static void mmc_blk_remove(struct mmc_card *card)
2635 {
2636         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2637
2638         mmc_blk_remove_parts(card, md);
2639         pm_runtime_get_sync(&card->dev);
2640         mmc_claim_host(card->host);
2641         mmc_blk_part_switch(card, md);
2642         mmc_release_host(card->host);
2643         if (card->type != MMC_TYPE_SD_COMBO)
2644                 pm_runtime_disable(&card->dev);
2645         pm_runtime_put_noidle(&card->dev);
2646         mmc_blk_remove_req(md);
2647         dev_set_drvdata(&card->dev, NULL);
2648 }
2649
2650 static int _mmc_blk_suspend(struct mmc_card *card)
2651 {
2652         struct mmc_blk_data *part_md;
2653         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2654
2655         if (md) {
2656                 mmc_queue_suspend(&md->queue);
2657                 list_for_each_entry(part_md, &md->part, part) {
2658                         mmc_queue_suspend(&part_md->queue);
2659                 }
2660         }
2661         return 0;
2662 }
2663
2664 static void mmc_blk_shutdown(struct mmc_card *card)
2665 {
2666         _mmc_blk_suspend(card);
2667 }
2668
2669 #ifdef CONFIG_PM_SLEEP
2670 static int mmc_blk_suspend(struct device *dev)
2671 {
2672         struct mmc_card *card = mmc_dev_to_card(dev);
2673
2674         return _mmc_blk_suspend(card);
2675 }
2676
2677 static int mmc_blk_resume(struct device *dev)
2678 {
2679         struct mmc_blk_data *part_md;
2680         struct mmc_blk_data *md = dev_get_drvdata(dev);
2681
2682         if (md) {
2683                 /*
2684                  * Resume involves the card going into idle state,
2685                  * so current partition is always the main one.
2686                  */
2687                 md->part_curr = md->part_type;
2688                 mmc_queue_resume(&md->queue);
2689                 list_for_each_entry(part_md, &md->part, part) {
2690                         mmc_queue_resume(&part_md->queue);
2691                 }
2692         }
2693         return 0;
2694 }
2695 #endif
2696
2697 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2698
2699 static struct mmc_driver mmc_driver = {
2700         .drv            = {
2701                 .name   = "mmcblk",
2702                 .pm     = &mmc_blk_pm_ops,
2703         },
2704         .probe          = mmc_blk_probe,
2705         .remove         = mmc_blk_remove,
2706         .shutdown       = mmc_blk_shutdown,
2707 };
2708
2709 static int __init mmc_blk_init(void)
2710 {
2711         int res;
2712
2713         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2714                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2715
2716         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2717
2718         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2719         if (res)
2720                 goto out;
2721
2722         res = mmc_register_driver(&mmc_driver);
2723         if (res)
2724                 goto out2;
2725
2726         return 0;
2727  out2:
2728         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2729  out:
2730         return res;
2731 }
2732
2733 static void __exit mmc_blk_exit(void)
2734 {
2735         mmc_unregister_driver(&mmc_driver);
2736         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2737 }
2738
2739 module_init(mmc_blk_init);
2740 module_exit(mmc_blk_exit);
2741
2742 MODULE_LICENSE("GPL");
2743 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2744