drivers/mmc/card/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/mutex.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/string_helpers.h>
  34 #include <linux/delay.h>
  35 #include <linux/capability.h>
  36 #include <linux/compat.h>
  37 #include <linux/pm_runtime.h>
  38 #include <linux/idr.h>
  39
  40 #include <linux/mmc/ioctl.h>
  41 #include <linux/mmc/card.h>
  42 #include <linux/mmc/host.h>
  43 #include <linux/mmc/mmc.h>
  44 #include <linux/mmc/sd.h>
  45
  46 #include <asm/uaccess.h>
  47
  48 #include "queue.h"
  49
  50 MODULE_ALIAS("mmc:block");
  51 #ifdef MODULE_PARAM_PREFIX
  52 #undef MODULE_PARAM_PREFIX
  53 #endif
  54 #define MODULE_PARAM_PREFIX "mmcblk."
  55
  56 #define INAND_CMD38_ARG_EXT_CSD  113
  57 #define INAND_CMD38_ARG_ERASE    0x00
  58 #define INAND_CMD38_ARG_TRIM     0x01
  59 #define INAND_CMD38_ARG_SECERASE 0x80
  60 #define INAND_CMD38_ARG_SECTRIM1 0x81
  61 #define INAND_CMD38_ARG_SECTRIM2 0x88
  62 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  63 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  64 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  65
  66 #define mmc_req_rel_wr(req)     ((req->cmd_flags & REQ_FUA) && \
  67                                   (rq_data_dir(req) == WRITE))
  68 #define PACKED_CMD_VER  0x01
  69 #define PACKED_CMD_WR   0x02
  70
  71 static DEFINE_MUTEX(block_mutex);
  72
  73 /*
  74  * The defaults come from config options but can be overriden by module
  75  * or bootarg options.
  76  */
  77 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  78
  79 /*
  80  * We've only got one major, so number of mmcblk devices is
  81  * limited to (1 << 20) / number of minors per device.  It is also
  82  * limited by the MAX_DEVICES below.
  83  */
  84 static int max_devices;
  85
  86 #define MAX_DEVICES 256
  87
  88 static DEFINE_IDA(mmc_blk_ida);
  89 static DEFINE_SPINLOCK(mmc_blk_lock);
  90
  91 /*
  92  * There is one mmc_blk_data per slot.
  93  */
  94 struct mmc_blk_data {
  95         spinlock_t      lock;
  96         struct gendisk  *disk;
  97         struct mmc_queue queue;
  98         struct list_head part;
  99
 100         unsigned int    flags;
 101 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
 102 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
 103 #define MMC_BLK_PACKED_CMD      (1 << 2)        /* MMC packed command support */
 104
 105         unsigned int    usage;
 106         unsigned int    read_only;
 107         unsigned int    part_type;
 108         unsigned int    reset_done;
 109 #define MMC_BLK_READ            BIT(0)
 110 #define MMC_BLK_WRITE           BIT(1)
 111 #define MMC_BLK_DISCARD         BIT(2)
 112 #define MMC_BLK_SECDISCARD      BIT(3)
 113
 114         /*
 115          * Only set in main mmc_blk_data associated
 116          * with mmc_card with dev_set_drvdata, and keeps
 117          * track of the current selected device partition.
 118          */
 119         unsigned int    part_curr;
 120         struct device_attribute force_ro;
 121         struct device_attribute power_ro_lock;
 122         int     area_type;
 123 };
 124
 125 static DEFINE_MUTEX(open_lock);
 126
 127 enum {
 128         MMC_PACKED_NR_IDX = -1,
 129         MMC_PACKED_NR_ZERO,
 130         MMC_PACKED_NR_SINGLE,
 131 };
 132
 133 module_param(perdev_minors, int, 0444);
 134 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 135
 136 static inline int mmc_blk_part_switch(struct mmc_card *card,
 137                                       struct mmc_blk_data *md);
 138 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 139
 140 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
 141 {
 142         struct mmc_packed *packed = mqrq->packed;
 143
 144         BUG_ON(!packed);
 145
 146         mqrq->cmd_type = MMC_PACKED_NONE;
 147         packed->nr_entries = MMC_PACKED_NR_ZERO;
 148         packed->idx_failure = MMC_PACKED_NR_IDX;
 149         packed->retries = 0;
 150         packed->blocks = 0;
 151 }
 152
 153 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 154 {
 155         struct mmc_blk_data *md;
 156
 157         mutex_lock(&open_lock);
 158         md = disk->private_data;
 159         if (md && md->usage == 0)
 160                 md = NULL;
 161         if (md)
 162                 md->usage++;
 163         mutex_unlock(&open_lock);
 164
 165         return md;
 166 }
 167
 168 static inline int mmc_get_devidx(struct gendisk *disk)
 169 {
 170         int devidx = disk->first_minor / perdev_minors;
 171         return devidx;
 172 }
 173
 174 static void mmc_blk_put(struct mmc_blk_data *md)
 175 {
 176         mutex_lock(&open_lock);
 177         md->usage--;
 178         if (md->usage == 0) {
 179                 int devidx = mmc_get_devidx(md->disk);
 180                 blk_cleanup_queue(md->queue.queue);
 181
 182                 spin_lock(&mmc_blk_lock);
 183                 ida_remove(&mmc_blk_ida, devidx);
 184                 spin_unlock(&mmc_blk_lock);
 185
 186                 put_disk(md->disk);
 187                 kfree(md);
 188         }
 189         mutex_unlock(&open_lock);
 190 }
 191
 192 static ssize_t power_ro_lock_show(struct device *dev,
 193                 struct device_attribute *attr, char *buf)
 194 {
 195         int ret;
 196         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 197         struct mmc_card *card = md->queue.card;
 198         int locked = 0;
 199
 200         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 201                 locked = 2;
 202         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 203                 locked = 1;
 204
 205         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 206
 207         mmc_blk_put(md);
 208
 209         return ret;
 210 }
 211
 212 static ssize_t power_ro_lock_store(struct device *dev,
 213                 struct device_attribute *attr, const char *buf, size_t count)
 214 {
 215         int ret;
 216         struct mmc_blk_data *md, *part_md;
 217         struct mmc_card *card;
 218         unsigned long set;
 219
 220         if (kstrtoul(buf, 0, &set))
 221                 return -EINVAL;
 222
 223         if (set != 1)
 224                 return count;
 225
 226         md = mmc_blk_get(dev_to_disk(dev));
 227         card = md->queue.card;
 228
 229         mmc_get_card(card);
 230
 231         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 232                                 card->ext_csd.boot_ro_lock |
 233                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 234                                 card->ext_csd.part_time);
 235         if (ret)
 236                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 237         else
 238                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 239
 240         mmc_put_card(card);
 241
 242         if (!ret) {
 243                 pr_info("%s: Locking boot partition ro until next power on\n",
 244                         md->disk->disk_name);
 245                 set_disk_ro(md->disk, 1);
 246
 247                 list_for_each_entry(part_md, &md->part, part)
 248                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 249                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 250                                 set_disk_ro(part_md->disk, 1);
 251                         }
 252         }
 253
 254         mmc_blk_put(md);
 255         return count;
 256 }
 257
 258 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 259                              char *buf)
 260 {
 261         int ret;
 262         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 263
 264         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 265                        get_disk_ro(dev_to_disk(dev)) ^
 266                        md->read_only);
 267         mmc_blk_put(md);
 268         return ret;
 269 }
 270
 271 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 272                               const char *buf, size_t count)
 273 {
 274         int ret;
 275         char *end;
 276         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 277         unsigned long set = simple_strtoul(buf, &end, 0);
 278         if (end == buf) {
 279                 ret = -EINVAL;
 280                 goto out;
 281         }
 282
 283         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 284         ret = count;
 285 out:
 286         mmc_blk_put(md);
 287         return ret;
 288 }
 289
 290 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 291 {
 292         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 293         int ret = -ENXIO;
 294
 295         mutex_lock(&block_mutex);
 296         if (md) {
 297                 if (md->usage == 2)
 298                         check_disk_change(bdev);
 299                 ret = 0;
 300
 301                 if ((mode & FMODE_WRITE) && md->read_only) {
 302                         mmc_blk_put(md);
 303                         ret = -EROFS;
 304                 }
 305         }
 306         mutex_unlock(&block_mutex);
 307
 308         return ret;
 309 }
 310
 311 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 312 {
 313         struct mmc_blk_data *md = disk->private_data;
 314
 315         mutex_lock(&block_mutex);
 316         mmc_blk_put(md);
 317         mutex_unlock(&block_mutex);
 318 }
 319
 320 static int
 321 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 322 {
 323         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 324         geo->heads = 4;
 325         geo->sectors = 16;
 326         return 0;
 327 }
 328
 329 struct mmc_blk_ioc_data {
 330         struct mmc_ioc_cmd ic;
 331         unsigned char *buf;
 332         u64 buf_bytes;
 333 };
 334
 335 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 336         struct mmc_ioc_cmd __user *user)
 337 {
 338         struct mmc_blk_ioc_data *idata;
 339         int err;
 340
 341         idata = kmalloc(sizeof(*idata), GFP_KERNEL);
 342         if (!idata) {
 343                 err = -ENOMEM;
 344                 goto out;
 345         }
 346
 347         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 348                 err = -EFAULT;
 349                 goto idata_err;
 350         }
 351
 352         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 353         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 354                 err = -EOVERFLOW;
 355                 goto idata_err;
 356         }
 357
 358         if (!idata->buf_bytes)
 359                 return idata;
 360
 361         idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
 362         if (!idata->buf) {
 363                 err = -ENOMEM;
 364                 goto idata_err;
 365         }
 366
 367         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 368                                         idata->ic.data_ptr, idata->buf_bytes)) {
 369                 err = -EFAULT;
 370                 goto copy_err;
 371         }
 372
 373         return idata;
 374
 375 copy_err:
 376         kfree(idata->buf);
 377 idata_err:
 378         kfree(idata);
 379 out:
 380         return ERR_PTR(err);
 381 }
 382
 383 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
 384                                       struct mmc_blk_ioc_data *idata)
 385 {
 386         struct mmc_ioc_cmd *ic = &idata->ic;
 387
 388         if (copy_to_user(&(ic_ptr->response), ic->response,
 389                          sizeof(ic->response)))
 390                 return -EFAULT;
 391
 392         if (!idata->ic.write_flag) {
 393                 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
 394                                  idata->buf, idata->buf_bytes))
 395                         return -EFAULT;
 396         }
 397
 398         return 0;
 399 }
 400
 401 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 402                                        u32 retries_max)
 403 {
 404         int err;
 405         u32 retry_count = 0;
 406
 407         if (!status || !retries_max)
 408                 return -EINVAL;
 409
 410         do {
 411                 err = get_card_status(card, status, 5);
 412                 if (err)
 413                         break;
 414
 415                 if (!R1_STATUS(*status) &&
 416                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 417                         break; /* RPMB programming operation complete */
 418
 419                 /*
 420                  * Rechedule to give the MMC device a chance to continue
 421                  * processing the previous command without being polled too
 422                  * frequently.
 423                  */
 424                 usleep_range(1000, 5000);
 425         } while (++retry_count < retries_max);
 426
 427         if (retry_count == retries_max)
 428                 err = -EPERM;
 429
 430         return err;
 431 }
 432
 433 static int ioctl_do_sanitize(struct mmc_card *card)
 434 {
 435         int err;
 436
 437         if (!mmc_can_sanitize(card)) {
 438                         pr_warn("%s: %s - SANITIZE is not supported\n",
 439                                 mmc_hostname(card->host), __func__);
 440                         err = -EOPNOTSUPP;
 441                         goto out;
 442         }
 443
 444         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 445                 mmc_hostname(card->host), __func__);
 446
 447         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 448                                         EXT_CSD_SANITIZE_START, 1,
 449                                         MMC_SANITIZE_REQ_TIMEOUT);
 450
 451         if (err)
 452                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 453                        mmc_hostname(card->host), __func__, err);
 454
 455         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 456                                              __func__);
 457 out:
 458         return err;
 459 }
 460
 461 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 462                                struct mmc_blk_ioc_data *idata)
 463 {
 464         struct mmc_command cmd = {0};
 465         struct mmc_data data = {0};
 466         struct mmc_request mrq = {NULL};
 467         struct scatterlist sg;
 468         int err;
 469         int is_rpmb = false;
 470         u32 status = 0;
 471
 472         if (!card || !md || !idata)
 473                 return -EINVAL;
 474
 475         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 476                 is_rpmb = true;
 477
 478         cmd.opcode = idata->ic.opcode;
 479         cmd.arg = idata->ic.arg;
 480         cmd.flags = idata->ic.flags;
 481
 482         if (idata->buf_bytes) {
 483                 data.sg = &sg;
 484                 data.sg_len = 1;
 485                 data.blksz = idata->ic.blksz;
 486                 data.blocks = idata->ic.blocks;
 487
 488                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 489
 490                 if (idata->ic.write_flag)
 491                         data.flags = MMC_DATA_WRITE;
 492                 else
 493                         data.flags = MMC_DATA_READ;
 494
 495                 /* data.flags must already be set before doing this. */
 496                 mmc_set_data_timeout(&data, card);
 497
 498                 /* Allow overriding the timeout_ns for empirical tuning. */
 499                 if (idata->ic.data_timeout_ns)
 500                         data.timeout_ns = idata->ic.data_timeout_ns;
 501
 502                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 503                         /*
 504                          * Pretend this is a data transfer and rely on the
 505                          * host driver to compute timeout.  When all host
 506                          * drivers support cmd.cmd_timeout for R1B, this
 507                          * can be changed to:
 508                          *
 509                          *     mrq.data = NULL;
 510                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 511                          */
 512                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 513                 }
 514
 515                 mrq.data = &data;
 516         }
 517
 518         mrq.cmd = &cmd;
 519
 520         err = mmc_blk_part_switch(card, md);
 521         if (err)
 522                 return err;
 523
 524         if (idata->ic.is_acmd) {
 525                 err = mmc_app_cmd(card->host, card);
 526                 if (err)
 527                         return err;
 528         }
 529
 530         if (is_rpmb) {
 531                 err = mmc_set_blockcount(card, data.blocks,
 532                         idata->ic.write_flag & (1 << 31));
 533                 if (err)
 534                         return err;
 535         }
 536
 537         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 538             (cmd.opcode == MMC_SWITCH)) {
 539                 err = ioctl_do_sanitize(card);
 540
 541                 if (err)
 542                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 543                                __func__, err);
 544
 545                 return err;
 546         }
 547
 548         mmc_wait_for_req(card->host, &mrq);
 549
 550         if (cmd.error) {
 551                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 552                                                 __func__, cmd.error);
 553                 return cmd.error;
 554         }
 555         if (data.error) {
 556                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 557                                                 __func__, data.error);
 558                 return data.error;
 559         }
 560
 561         /*
 562          * According to the SD specs, some commands require a delay after
 563          * issuing the command.
 564          */
 565         if (idata->ic.postsleep_min_us)
 566                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 567
 568         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
 569
 570         if (is_rpmb) {
 571                 /*
 572                  * Ensure RPMB command has completed by polling CMD13
 573                  * "Send Status".
 574                  */
 575                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 576                 if (err)
 577                         dev_err(mmc_dev(card->host),
 578                                         "%s: Card Status=0x%08X, error %d\n",
 579                                         __func__, status, err);
 580         }
 581
 582         return err;
 583 }
 584
 585 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 586                              struct mmc_ioc_cmd __user *ic_ptr)
 587 {
 588         struct mmc_blk_ioc_data *idata;
 589         struct mmc_blk_data *md;
 590         struct mmc_card *card;
 591         int err = 0, ioc_err = 0;
 592
 593         /*
 594          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 595          * whole block device, not on a partition.  This prevents overspray
 596          * between sibling partitions.
 597          */
 598         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 599                 return -EPERM;
 600
 601         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 602         if (IS_ERR(idata))
 603                 return PTR_ERR(idata);
 604
 605         md = mmc_blk_get(bdev->bd_disk);
 606         if (!md) {
 607                 err = -EINVAL;
 608                 goto cmd_err;
 609         }
 610
 611         card = md->queue.card;
 612         if (IS_ERR(card)) {
 613                 err = PTR_ERR(card);
 614                 goto cmd_done;
 615         }
 616
 617         mmc_get_card(card);
 618
 619         ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
 620
 621         /* Always switch back to main area after RPMB access */
 622         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 623                 mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
 624
 625         mmc_put_card(card);
 626
 627         err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
 628
 629 cmd_done:
 630         mmc_blk_put(md);
 631 cmd_err:
 632         kfree(idata->buf);
 633         kfree(idata);
 634         return ioc_err ? ioc_err : err;
 635 }
 636
 637 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 638                                    struct mmc_ioc_multi_cmd __user *user)
 639 {
 640         struct mmc_blk_ioc_data **idata = NULL;
 641         struct mmc_ioc_cmd __user *cmds = user->cmds;
 642         struct mmc_card *card;
 643         struct mmc_blk_data *md;
 644         int i, err = 0, ioc_err = 0;
 645         __u64 num_of_cmds;
 646
 647         /*
 648          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 649          * whole block device, not on a partition.  This prevents overspray
 650          * between sibling partitions.
 651          */
 652         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 653                 return -EPERM;
 654
 655         if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
 656                            sizeof(num_of_cmds)))
 657                 return -EFAULT;
 658
 659         if (num_of_cmds > MMC_IOC_MAX_CMDS)
 660                 return -EINVAL;
 661
 662         idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
 663         if (!idata)
 664                 return -ENOMEM;
 665
 666         for (i = 0; i < num_of_cmds; i++) {
 667                 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
 668                 if (IS_ERR(idata[i])) {
 669                         err = PTR_ERR(idata[i]);
 670                         num_of_cmds = i;
 671                         goto cmd_err;
 672                 }
 673         }
 674
 675         md = mmc_blk_get(bdev->bd_disk);
 676         if (!md) {
 677                 err = -EINVAL;
 678                 goto cmd_err;
 679         }
 680
 681         card = md->queue.card;
 682         if (IS_ERR(card)) {
 683                 err = PTR_ERR(card);
 684                 goto cmd_done;
 685         }
 686
 687         mmc_get_card(card);
 688
 689         for (i = 0; i < num_of_cmds && !ioc_err; i++)
 690                 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 691
 692         /* Always switch back to main area after RPMB access */
 693         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 694                 mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
 695
 696         mmc_put_card(card);
 697
 698         /* copy to user if data and response */
 699         for (i = 0; i < num_of_cmds && !err; i++)
 700                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 701
 702 cmd_done:
 703         mmc_blk_put(md);
 704 cmd_err:
 705         for (i = 0; i < num_of_cmds; i++) {
 706                 kfree(idata[i]->buf);
 707                 kfree(idata[i]);
 708         }
 709         kfree(idata);
 710         return ioc_err ? ioc_err : err;
 711 }
 712
 713 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 714         unsigned int cmd, unsigned long arg)
 715 {
 716         switch (cmd) {
 717         case MMC_IOC_CMD:
 718                 return mmc_blk_ioctl_cmd(bdev,
 719                                 (struct mmc_ioc_cmd __user *)arg);
 720         case MMC_IOC_MULTI_CMD:
 721                 return mmc_blk_ioctl_multi_cmd(bdev,
 722                                 (struct mmc_ioc_multi_cmd __user *)arg);
 723         default:
 724                 return -EINVAL;
 725         }
 726 }
 727
 728 #ifdef CONFIG_COMPAT
 729 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 730         unsigned int cmd, unsigned long arg)
 731 {
 732         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 733 }
 734 #endif
 735
 736 static const struct block_device_operations mmc_bdops = {
 737         .open                   = mmc_blk_open,
 738         .release                = mmc_blk_release,
 739         .getgeo                 = mmc_blk_getgeo,
 740         .owner                  = THIS_MODULE,
 741         .ioctl                  = mmc_blk_ioctl,
 742 #ifdef CONFIG_COMPAT
 743         .compat_ioctl           = mmc_blk_compat_ioctl,
 744 #endif
 745 };
 746
 747 static inline int mmc_blk_part_switch(struct mmc_card *card,
 748                                       struct mmc_blk_data *md)
 749 {
 750         int ret;
 751         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 752
 753         if (main_md->part_curr == md->part_type)
 754                 return 0;
 755
 756         if (mmc_card_mmc(card)) {
 757                 u8 part_config = card->ext_csd.part_config;
 758
 759                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 760                 part_config |= md->part_type;
 761
 762                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 763                                  EXT_CSD_PART_CONFIG, part_config,
 764                                  card->ext_csd.part_time);
 765                 if (ret)
 766                         return ret;
 767
 768                 card->ext_csd.part_config = part_config;
 769         }
 770
 771         main_md->part_curr = md->part_type;
 772         return 0;
 773 }
 774
 775 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 776 {
 777         int err;
 778         u32 result;
 779         __be32 *blocks;
 780
 781         struct mmc_request mrq = {NULL};
 782         struct mmc_command cmd = {0};
 783         struct mmc_data data = {0};
 784
 785         struct scatterlist sg;
 786
 787         cmd.opcode = MMC_APP_CMD;
 788         cmd.arg = card->rca << 16;
 789         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 790
 791         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 792         if (err)
 793                 return (u32)-1;
 794         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 795                 return (u32)-1;
 796
 797         memset(&cmd, 0, sizeof(struct mmc_command));
 798
 799         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 800         cmd.arg = 0;
 801         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 802
 803         data.blksz = 4;
 804         data.blocks = 1;
 805         data.flags = MMC_DATA_READ;
 806         data.sg = &sg;
 807         data.sg_len = 1;
 808         mmc_set_data_timeout(&data, card);
 809
 810         mrq.cmd = &cmd;
 811         mrq.data = &data;
 812
 813         blocks = kmalloc(4, GFP_KERNEL);
 814         if (!blocks)
 815                 return (u32)-1;
 816
 817         sg_init_one(&sg, blocks, 4);
 818
 819         mmc_wait_for_req(card->host, &mrq);
 820
 821         result = ntohl(*blocks);
 822         kfree(blocks);
 823
 824         if (cmd.error || data.error)
 825                 result = (u32)-1;
 826
 827         return result;
 828 }
 829
 830 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 831 {
 832         struct mmc_command cmd = {0};
 833         int err;
 834
 835         cmd.opcode = MMC_SEND_STATUS;
 836         if (!mmc_host_is_spi(card->host))
 837                 cmd.arg = card->rca << 16;
 838         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 839         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 840         if (err == 0)
 841                 *status = cmd.resp[0];
 842         return err;
 843 }
 844
 845 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 846                 bool hw_busy_detect, struct request *req, int *gen_err)
 847 {
 848         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 849         int err = 0;
 850         u32 status;
 851
 852         do {
 853                 err = get_card_status(card, &status, 5);
 854                 if (err) {
 855                         pr_err("%s: error %d requesting status\n",
 856                                req->rq_disk->disk_name, err);
 857                         return err;
 858                 }
 859
 860                 if (status & R1_ERROR) {
 861                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 862                                 req->rq_disk->disk_name, __func__, status);
 863                         *gen_err = 1;
 864                 }
 865
 866                 /* We may rely on the host hw to handle busy detection.*/
 867                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 868                         hw_busy_detect)
 869                         break;
 870
 871                 /*
 872                  * Timeout if the device never becomes ready for data and never
 873                  * leaves the program state.
 874                  */
 875                 if (time_after(jiffies, timeout)) {
 876                         pr_err("%s: Card stuck in programming state! %s %s\n",
 877                                 mmc_hostname(card->host),
 878                                 req->rq_disk->disk_name, __func__);
 879                         return -ETIMEDOUT;
 880                 }
 881
 882                 /*
 883                  * Some cards mishandle the status bits,
 884                  * so make sure to check both the busy
 885                  * indication and the card state.
 886                  */
 887         } while (!(status & R1_READY_FOR_DATA) ||
 888                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 889
 890         return err;
 891 }
 892
 893 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 894                 struct request *req, int *gen_err, u32 *stop_status)
 895 {
 896         struct mmc_host *host = card->host;
 897         struct mmc_command cmd = {0};
 898         int err;
 899         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 900
 901         /*
 902          * Normally we use R1B responses for WRITE, but in cases where the host
 903          * has specified a max_busy_timeout we need to validate it. A failure
 904          * means we need to prevent the host from doing hw busy detection, which
 905          * is done by converting to a R1 response instead.
 906          */
 907         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 908                 use_r1b_resp = false;
 909
 910         cmd.opcode = MMC_STOP_TRANSMISSION;
 911         if (use_r1b_resp) {
 912                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 913                 cmd.busy_timeout = timeout_ms;
 914         } else {
 915                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 916         }
 917
 918         err = mmc_wait_for_cmd(host, &cmd, 5);
 919         if (err)
 920                 return err;
 921
 922         *stop_status = cmd.resp[0];
 923
 924         /* No need to check card status in case of READ. */
 925         if (rq_data_dir(req) == READ)
 926                 return 0;
 927
 928         if (!mmc_host_is_spi(host) &&
 929                 (*stop_status & R1_ERROR)) {
 930                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 931                         req->rq_disk->disk_name, __func__, *stop_status);
 932                 *gen_err = 1;
 933         }
 934
 935         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 936 }
 937
 938 #define ERR_NOMEDIUM    3
 939 #define ERR_RETRY       2
 940 #define ERR_ABORT       1
 941 #define ERR_CONTINUE    0
 942
 943 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 944         bool status_valid, u32 status)
 945 {
 946         switch (error) {
 947         case -EILSEQ:
 948                 /* response crc error, retry the r/w cmd */
 949                 pr_err("%s: %s sending %s command, card status %#x\n",
 950                         req->rq_disk->disk_name, "response CRC error",
 951                         name, status);
 952                 return ERR_RETRY;
 953
 954         case -ETIMEDOUT:
 955                 pr_err("%s: %s sending %s command, card status %#x\n",
 956                         req->rq_disk->disk_name, "timed out", name, status);
 957
 958                 /* If the status cmd initially failed, retry the r/w cmd */
 959                 if (!status_valid) {
 960                         pr_err("%s: status not valid, retrying timeout\n",
 961                                 req->rq_disk->disk_name);
 962                         return ERR_RETRY;
 963                 }
 964
 965                 /*
 966                  * If it was a r/w cmd crc error, or illegal command
 967                  * (eg, issued in wrong state) then retry - we should
 968                  * have corrected the state problem above.
 969                  */
 970                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
 971                         pr_err("%s: command error, retrying timeout\n",
 972                                 req->rq_disk->disk_name);
 973                         return ERR_RETRY;
 974                 }
 975
 976                 /* Otherwise abort the command */
 977                 return ERR_ABORT;
 978
 979         default:
 980                 /* We don't understand the error code the driver gave us */
 981                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 982                        req->rq_disk->disk_name, error, status);
 983                 return ERR_ABORT;
 984         }
 985 }
 986
 987 /*
 988  * Initial r/w and stop cmd error recovery.
 989  * We don't know whether the card received the r/w cmd or not, so try to
 990  * restore things back to a sane state.  Essentially, we do this as follows:
 991  * - Obtain card status.  If the first attempt to obtain card status fails,
 992  *   the status word will reflect the failed status cmd, not the failed
 993  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 994  *   longer communicate with the card.
 995  * - Check the card state.  If the card received the cmd but there was a
 996  *   transient problem with the response, it might still be in a data transfer
 997  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 998  * - If the r/w cmd failed due to a response CRC error, it was probably
 999  *   transient, so retry the cmd.
1000  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
1001  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
1002  *   illegal cmd, retry.
1003  * Otherwise we don't understand what happened, so abort.
1004  */
1005 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
1006         struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
1007 {
1008         bool prev_cmd_status_valid = true;
1009         u32 status, stop_status = 0;
1010         int err, retry;
1011
1012         if (mmc_card_removed(card))
1013                 return ERR_NOMEDIUM;
1014
1015         /*
1016          * Try to get card status which indicates both the card state
1017          * and why there was no response.  If the first attempt fails,
1018          * we can't be sure the returned status is for the r/w command.
1019          */
1020         for (retry = 2; retry >= 0; retry--) {
1021                 err = get_card_status(card, &status, 0);
1022                 if (!err)
1023                         break;
1024
1025                 /* Re-tune if needed */
1026                 mmc_retune_recheck(card->host);
1027
1028                 prev_cmd_status_valid = false;
1029                 pr_err("%s: error %d sending status command, %sing\n",
1030                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1031         }
1032
1033         /* We couldn't get a response from the card.  Give up. */
1034         if (err) {
1035                 /* Check if the card is removed */
1036                 if (mmc_detect_card_removed(card->host))
1037                         return ERR_NOMEDIUM;
1038                 return ERR_ABORT;
1039         }
1040
1041         /* Flag ECC errors */
1042         if ((status & R1_CARD_ECC_FAILED) ||
1043             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1044             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1045                 *ecc_err = 1;
1046
1047         /* Flag General errors */
1048         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1049                 if ((status & R1_ERROR) ||
1050                         (brq->stop.resp[0] & R1_ERROR)) {
1051                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1052                                req->rq_disk->disk_name, __func__,
1053                                brq->stop.resp[0], status);
1054                         *gen_err = 1;
1055                 }
1056
1057         /*
1058          * Check the current card state.  If it is in some data transfer
1059          * mode, tell it to stop (and hopefully transition back to TRAN.)
1060          */
1061         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1062             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1063                 err = send_stop(card,
1064                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1065                         req, gen_err, &stop_status);
1066                 if (err) {
1067                         pr_err("%s: error %d sending stop command\n",
1068                                req->rq_disk->disk_name, err);
1069                         /*
1070                          * If the stop cmd also timed out, the card is probably
1071                          * not present, so abort. Other errors are bad news too.
1072                          */
1073                         return ERR_ABORT;
1074                 }
1075
1076                 if (stop_status & R1_CARD_ECC_FAILED)
1077                         *ecc_err = 1;
1078         }
1079
1080         /* Check for set block count errors */
1081         if (brq->sbc.error)
1082                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1083                                 prev_cmd_status_valid, status);
1084
1085         /* Check for r/w command errors */
1086         if (brq->cmd.error)
1087                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1088                                 prev_cmd_status_valid, status);
1089
1090         /* Data errors */
1091         if (!brq->stop.error)
1092                 return ERR_CONTINUE;
1093
1094         /* Now for stop errors.  These aren't fatal to the transfer. */
1095         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1096                req->rq_disk->disk_name, brq->stop.error,
1097                brq->cmd.resp[0], status);
1098
1099         /*
1100          * Subsitute in our own stop status as this will give the error
1101          * state which happened during the execution of the r/w command.
1102          */
1103         if (stop_status) {
1104                 brq->stop.resp[0] = stop_status;
1105                 brq->stop.error = 0;
1106         }
1107         return ERR_CONTINUE;
1108 }
1109
1110 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1111                          int type)
1112 {
1113         int err;
1114
1115         if (md->reset_done & type)
1116                 return -EEXIST;
1117
1118         md->reset_done |= type;
1119         err = mmc_hw_reset(host);
1120         /* Ensure we switch back to the correct partition */
1121         if (err != -EOPNOTSUPP) {
1122                 struct mmc_blk_data *main_md =
1123                         dev_get_drvdata(&host->card->dev);
1124                 int part_err;
1125
1126                 main_md->part_curr = main_md->part_type;
1127                 part_err = mmc_blk_part_switch(host->card, md);
1128                 if (part_err) {
1129                         /*
1130                          * We have failed to get back into the correct
1131                          * partition, so we need to abort the whole request.
1132                          */
1133                         return -ENODEV;
1134                 }
1135         }
1136         return err;
1137 }
1138
1139 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1140 {
1141         md->reset_done &= ~type;
1142 }
1143
1144 int mmc_access_rpmb(struct mmc_queue *mq)
1145 {
1146         struct mmc_blk_data *md = mq->data;
1147         /*
1148          * If this is a RPMB partition access, return ture
1149          */
1150         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1151                 return true;
1152
1153         return false;
1154 }
1155
1156 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1157 {
1158         struct mmc_blk_data *md = mq->data;
1159         struct mmc_card *card = md->queue.card;
1160         unsigned int from, nr, arg;
1161         int err = 0, type = MMC_BLK_DISCARD;
1162
1163         if (!mmc_can_erase(card)) {
1164                 err = -EOPNOTSUPP;
1165                 goto out;
1166         }
1167
1168         from = blk_rq_pos(req);
1169         nr = blk_rq_sectors(req);
1170
1171         if (mmc_can_discard(card))
1172                 arg = MMC_DISCARD_ARG;
1173         else if (mmc_can_trim(card))
1174                 arg = MMC_TRIM_ARG;
1175         else
1176                 arg = MMC_ERASE_ARG;
1177 retry:
1178         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1179                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1180                                  INAND_CMD38_ARG_EXT_CSD,
1181                                  arg == MMC_TRIM_ARG ?
1182                                  INAND_CMD38_ARG_TRIM :
1183                                  INAND_CMD38_ARG_ERASE,
1184                                  0);
1185                 if (err)
1186                         goto out;
1187         }
1188         err = mmc_erase(card, from, nr, arg);
1189 out:
1190         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1191                 goto retry;
1192         if (!err)
1193                 mmc_blk_reset_success(md, type);
1194         blk_end_request(req, err, blk_rq_bytes(req));
1195
1196         return err ? 0 : 1;
1197 }
1198
1199 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1200                                        struct request *req)
1201 {
1202         struct mmc_blk_data *md = mq->data;
1203         struct mmc_card *card = md->queue.card;
1204         unsigned int from, nr, arg;
1205         int err = 0, type = MMC_BLK_SECDISCARD;
1206
1207         if (!(mmc_can_secure_erase_trim(card))) {
1208                 err = -EOPNOTSUPP;
1209                 goto out;
1210         }
1211
1212         from = blk_rq_pos(req);
1213         nr = blk_rq_sectors(req);
1214
1215         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1216                 arg = MMC_SECURE_TRIM1_ARG;
1217         else
1218                 arg = MMC_SECURE_ERASE_ARG;
1219
1220 retry:
1221         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1222                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1223                                  INAND_CMD38_ARG_EXT_CSD,
1224                                  arg == MMC_SECURE_TRIM1_ARG ?
1225                                  INAND_CMD38_ARG_SECTRIM1 :
1226                                  INAND_CMD38_ARG_SECERASE,
1227                                  0);
1228                 if (err)
1229                         goto out_retry;
1230         }
1231
1232         err = mmc_erase(card, from, nr, arg);
1233         if (err == -EIO)
1234                 goto out_retry;
1235         if (err)
1236                 goto out;
1237
1238         if (arg == MMC_SECURE_TRIM1_ARG) {
1239                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1240                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1241                                          INAND_CMD38_ARG_EXT_CSD,
1242                                          INAND_CMD38_ARG_SECTRIM2,
1243                                          0);
1244                         if (err)
1245                                 goto out_retry;
1246                 }
1247
1248                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1249                 if (err == -EIO)
1250                         goto out_retry;
1251                 if (err)
1252                         goto out;
1253         }
1254
1255 out_retry:
1256         if (err && !mmc_blk_reset(md, card->host, type))
1257                 goto retry;
1258         if (!err)
1259                 mmc_blk_reset_success(md, type);
1260 out:
1261         blk_end_request(req, err, blk_rq_bytes(req));
1262
1263         return err ? 0 : 1;
1264 }
1265
1266 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1267 {
1268         struct mmc_blk_data *md = mq->data;
1269         struct mmc_card *card = md->queue.card;
1270         int ret = 0;
1271
1272         ret = mmc_flush_cache(card);
1273         if (ret)
1274                 ret = -EIO;
1275
1276         blk_end_request_all(req, ret);
1277
1278         return ret ? 0 : 1;
1279 }
1280
1281 /*
1282  * Reformat current write as a reliable write, supporting
1283  * both legacy and the enhanced reliable write MMC cards.
1284  * In each transfer we'll handle only as much as a single
1285  * reliable write can handle, thus finish the request in
1286  * partial completions.
1287  */
1288 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1289                                     struct mmc_card *card,
1290                                     struct request *req)
1291 {
1292         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1293                 /* Legacy mode imposes restrictions on transfers. */
1294                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1295                         brq->data.blocks = 1;
1296
1297                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1298                         brq->data.blocks = card->ext_csd.rel_sectors;
1299                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1300                         brq->data.blocks = 1;
1301         }
1302 }
1303
1304 #define CMD_ERRORS                                                      \
1305         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1306          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1307          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1308          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1309          R1_CC_ERROR |          /* Card controller error */             \
1310          R1_ERROR)              /* General/unknown error */
1311
1312 static int mmc_blk_err_check(struct mmc_card *card,
1313                              struct mmc_async_req *areq)
1314 {
1315         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1316                                                     mmc_active);
1317         struct mmc_blk_request *brq = &mq_mrq->brq;
1318         struct request *req = mq_mrq->req;
1319         int need_retune = card->host->need_retune;
1320         int ecc_err = 0, gen_err = 0;
1321
1322         /*
1323          * sbc.error indicates a problem with the set block count
1324          * command.  No data will have been transferred.
1325          *
1326          * cmd.error indicates a problem with the r/w command.  No
1327          * data will have been transferred.
1328          *
1329          * stop.error indicates a problem with the stop command.  Data
1330          * may have been transferred, or may still be transferring.
1331          */
1332         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1333             brq->data.error) {
1334                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1335                 case ERR_RETRY:
1336                         return MMC_BLK_RETRY;
1337                 case ERR_ABORT:
1338                         return MMC_BLK_ABORT;
1339                 case ERR_NOMEDIUM:
1340                         return MMC_BLK_NOMEDIUM;
1341                 case ERR_CONTINUE:
1342                         break;
1343                 }
1344         }
1345
1346         /*
1347          * Check for errors relating to the execution of the
1348          * initial command - such as address errors.  No data
1349          * has been transferred.
1350          */
1351         if (brq->cmd.resp[0] & CMD_ERRORS) {
1352                 pr_err("%s: r/w command failed, status = %#x\n",
1353                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1354                 return MMC_BLK_ABORT;
1355         }
1356
1357         /*
1358          * Everything else is either success, or a data error of some
1359          * kind.  If it was a write, we may have transitioned to
1360          * program mode, which we have to wait for it to complete.
1361          */
1362         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1363                 int err;
1364
1365                 /* Check stop command response */
1366                 if (brq->stop.resp[0] & R1_ERROR) {
1367                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1368                                req->rq_disk->disk_name, __func__,
1369                                brq->stop.resp[0]);
1370                         gen_err = 1;
1371                 }
1372
1373                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1374                                         &gen_err);
1375                 if (err)
1376                         return MMC_BLK_CMD_ERR;
1377         }
1378
1379         /* if general error occurs, retry the write operation. */
1380         if (gen_err) {
1381                 pr_warn("%s: retrying write for general error\n",
1382                                 req->rq_disk->disk_name);
1383                 return MMC_BLK_RETRY;
1384         }
1385
1386         if (brq->data.error) {
1387                 if (need_retune && !brq->retune_retry_done) {
1388                         pr_debug("%s: retrying because a re-tune was needed\n",
1389                                  req->rq_disk->disk_name);
1390                         brq->retune_retry_done = 1;
1391                         return MMC_BLK_RETRY;
1392                 }
1393                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1394                        req->rq_disk->disk_name, brq->data.error,
1395                        (unsigned)blk_rq_pos(req),
1396                        (unsigned)blk_rq_sectors(req),
1397                        brq->cmd.resp[0], brq->stop.resp[0]);
1398
1399                 if (rq_data_dir(req) == READ) {
1400                         if (ecc_err)
1401                                 return MMC_BLK_ECC_ERR;
1402                         return MMC_BLK_DATA_ERR;
1403                 } else {
1404                         return MMC_BLK_CMD_ERR;
1405                 }
1406         }
1407
1408         if (!brq->data.bytes_xfered)
1409                 return MMC_BLK_RETRY;
1410
1411         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1412                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1413                         return MMC_BLK_PARTIAL;
1414                 else
1415                         return MMC_BLK_SUCCESS;
1416         }
1417
1418         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1419                 return MMC_BLK_PARTIAL;
1420
1421         return MMC_BLK_SUCCESS;
1422 }
1423
1424 static int mmc_blk_packed_err_check(struct mmc_card *card,
1425                                     struct mmc_async_req *areq)
1426 {
1427         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1428                         mmc_active);
1429         struct request *req = mq_rq->req;
1430         struct mmc_packed *packed = mq_rq->packed;
1431         int err, check, status;
1432         u8 *ext_csd;
1433
1434         BUG_ON(!packed);
1435
1436         packed->retries--;
1437         check = mmc_blk_err_check(card, areq);
1438         err = get_card_status(card, &status, 0);
1439         if (err) {
1440                 pr_err("%s: error %d sending status command\n",
1441                        req->rq_disk->disk_name, err);
1442                 return MMC_BLK_ABORT;
1443         }
1444
1445         if (status & R1_EXCEPTION_EVENT) {
1446                 err = mmc_get_ext_csd(card, &ext_csd);
1447                 if (err) {
1448                         pr_err("%s: error %d sending ext_csd\n",
1449                                req->rq_disk->disk_name, err);
1450                         return MMC_BLK_ABORT;
1451                 }
1452
1453                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1454                      EXT_CSD_PACKED_FAILURE) &&
1455                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1456                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1457                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1458                             EXT_CSD_PACKED_INDEXED_ERROR) {
1459                                 packed->idx_failure =
1460                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1461                                 check = MMC_BLK_PARTIAL;
1462                         }
1463                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1464                                "failure index: %d\n",
1465                                req->rq_disk->disk_name, packed->nr_entries,
1466                                packed->blocks, packed->idx_failure);
1467                 }
1468                 kfree(ext_csd);
1469         }
1470
1471         return check;
1472 }
1473
1474 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1475                                struct mmc_card *card,
1476                                int disable_multi,
1477                                struct mmc_queue *mq)
1478 {
1479         u32 readcmd, writecmd;
1480         struct mmc_blk_request *brq = &mqrq->brq;
1481         struct request *req = mqrq->req;
1482         struct mmc_blk_data *md = mq->data;
1483         bool do_data_tag;
1484
1485         /*
1486          * Reliable writes are used to implement Forced Unit Access and
1487          * are supported only on MMCs.
1488          */
1489         bool do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1490                 (rq_data_dir(req) == WRITE) &&
1491                 (md->flags & MMC_BLK_REL_WR);
1492
1493         memset(brq, 0, sizeof(struct mmc_blk_request));
1494         brq->mrq.cmd = &brq->cmd;
1495         brq->mrq.data = &brq->data;
1496
1497         brq->cmd.arg = blk_rq_pos(req);
1498         if (!mmc_card_blockaddr(card))
1499                 brq->cmd.arg <<= 9;
1500         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1501         brq->data.blksz = 512;
1502         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1503         brq->stop.arg = 0;
1504         brq->data.blocks = blk_rq_sectors(req);
1505
1506         /*
1507          * The block layer doesn't support all sector count
1508          * restrictions, so we need to be prepared for too big
1509          * requests.
1510          */
1511         if (brq->data.blocks > card->host->max_blk_count)
1512                 brq->data.blocks = card->host->max_blk_count;
1513
1514         if (brq->data.blocks > 1) {
1515                 /*
1516                  * After a read error, we redo the request one sector
1517                  * at a time in order to accurately determine which
1518                  * sectors can be read successfully.
1519                  */
1520                 if (disable_multi)
1521                         brq->data.blocks = 1;
1522
1523                 /*
1524                  * Some controllers have HW issues while operating
1525                  * in multiple I/O mode
1526                  */
1527                 if (card->host->ops->multi_io_quirk)
1528                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1529                                                 (rq_data_dir(req) == READ) ?
1530                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1531                                                 brq->data.blocks);
1532         }
1533
1534         if (brq->data.blocks > 1 || do_rel_wr) {
1535                 /* SPI multiblock writes terminate using a special
1536                  * token, not a STOP_TRANSMISSION request.
1537                  */
1538                 if (!mmc_host_is_spi(card->host) ||
1539                     rq_data_dir(req) == READ)
1540                         brq->mrq.stop = &brq->stop;
1541                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1542                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1543         } else {
1544                 brq->mrq.stop = NULL;
1545                 readcmd = MMC_READ_SINGLE_BLOCK;
1546                 writecmd = MMC_WRITE_BLOCK;
1547         }
1548         if (rq_data_dir(req) == READ) {
1549                 brq->cmd.opcode = readcmd;
1550                 brq->data.flags = MMC_DATA_READ;
1551                 if (brq->mrq.stop)
1552                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1553                                         MMC_CMD_AC;
1554         } else {
1555                 brq->cmd.opcode = writecmd;
1556                 brq->data.flags = MMC_DATA_WRITE;
1557                 if (brq->mrq.stop)
1558                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1559                                         MMC_CMD_AC;
1560         }
1561
1562         if (do_rel_wr)
1563                 mmc_apply_rel_rw(brq, card, req);
1564
1565         /*
1566          * Data tag is used only during writing meta data to speed
1567          * up write and any subsequent read of this meta data
1568          */
1569         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1570                 (req->cmd_flags & REQ_META) &&
1571                 (rq_data_dir(req) == WRITE) &&
1572                 ((brq->data.blocks * brq->data.blksz) >=
1573                  card->ext_csd.data_tag_unit_size);
1574
1575         /*
1576          * Pre-defined multi-block transfers are preferable to
1577          * open ended-ones (and necessary for reliable writes).
1578          * However, it is not sufficient to just send CMD23,
1579          * and avoid the final CMD12, as on an error condition
1580          * CMD12 (stop) needs to be sent anyway. This, coupled
1581          * with Auto-CMD23 enhancements provided by some
1582          * hosts, means that the complexity of dealing
1583          * with this is best left to the host. If CMD23 is
1584          * supported by card and host, we'll fill sbc in and let
1585          * the host deal with handling it correctly. This means
1586          * that for hosts that don't expose MMC_CAP_CMD23, no
1587          * change of behavior will be observed.
1588          *
1589          * N.B: Some MMC cards experience perf degradation.
1590          * We'll avoid using CMD23-bounded multiblock writes for
1591          * these, while retaining features like reliable writes.
1592          */
1593         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1594             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1595              do_data_tag)) {
1596                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1597                 brq->sbc.arg = brq->data.blocks |
1598                         (do_rel_wr ? (1 << 31) : 0) |
1599                         (do_data_tag ? (1 << 29) : 0);
1600                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1601                 brq->mrq.sbc = &brq->sbc;
1602         }
1603
1604         mmc_set_data_timeout(&brq->data, card);
1605
1606         brq->data.sg = mqrq->sg;
1607         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1608
1609         /*
1610          * Adjust the sg list so it is the same size as the
1611          * request.
1612          */
1613         if (brq->data.blocks != blk_rq_sectors(req)) {
1614                 int i, data_size = brq->data.blocks << 9;
1615                 struct scatterlist *sg;
1616
1617                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1618                         data_size -= sg->length;
1619                         if (data_size <= 0) {
1620                                 sg->length += data_size;
1621                                 i++;
1622                                 break;
1623                         }
1624                 }
1625                 brq->data.sg_len = i;
1626         }
1627
1628         mqrq->mmc_active.mrq = &brq->mrq;
1629         mqrq->mmc_active.err_check = mmc_blk_err_check;
1630
1631         mmc_queue_bounce_pre(mqrq);
1632 }
1633
1634 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1635                                           struct mmc_card *card)
1636 {
1637         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1638         unsigned int max_seg_sz = queue_max_segment_size(q);
1639         unsigned int len, nr_segs = 0;
1640
1641         do {
1642                 len = min(hdr_sz, max_seg_sz);
1643                 hdr_sz -= len;
1644                 nr_segs++;
1645         } while (hdr_sz);
1646
1647         return nr_segs;
1648 }
1649
1650 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1651 {
1652         struct request_queue *q = mq->queue;
1653         struct mmc_card *card = mq->card;
1654         struct request *cur = req, *next = NULL;
1655         struct mmc_blk_data *md = mq->data;
1656         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1657         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1658         unsigned int req_sectors = 0, phys_segments = 0;
1659         unsigned int max_blk_count, max_phys_segs;
1660         bool put_back = true;
1661         u8 max_packed_rw = 0;
1662         u8 reqs = 0;
1663
1664         if (!(md->flags & MMC_BLK_PACKED_CMD))
1665                 goto no_packed;
1666
1667         if ((rq_data_dir(cur) == WRITE) &&
1668             mmc_host_packed_wr(card->host))
1669                 max_packed_rw = card->ext_csd.max_packed_writes;
1670
1671         if (max_packed_rw == 0)
1672                 goto no_packed;
1673
1674         if (mmc_req_rel_wr(cur) &&
1675             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1676                 goto no_packed;
1677
1678         if (mmc_large_sector(card) &&
1679             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1680                 goto no_packed;
1681
1682         mmc_blk_clear_packed(mqrq);
1683
1684         max_blk_count = min(card->host->max_blk_count,
1685                             card->host->max_req_size >> 9);
1686         if (unlikely(max_blk_count > 0xffff))
1687                 max_blk_count = 0xffff;
1688
1689         max_phys_segs = queue_max_segments(q);
1690         req_sectors += blk_rq_sectors(cur);
1691         phys_segments += cur->nr_phys_segments;
1692
1693         if (rq_data_dir(cur) == WRITE) {
1694                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1695                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1696         }
1697
1698         do {
1699                 if (reqs >= max_packed_rw - 1) {
1700                         put_back = false;
1701                         break;
1702                 }
1703
1704                 spin_lock_irq(q->queue_lock);
1705                 next = blk_fetch_request(q);
1706                 spin_unlock_irq(q->queue_lock);
1707                 if (!next) {
1708                         put_back = false;
1709                         break;
1710                 }
1711
1712                 if (mmc_large_sector(card) &&
1713                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1714                         break;
1715
1716                 if (next->cmd_flags & REQ_DISCARD ||
1717                     next->cmd_flags & REQ_FLUSH)
1718                         break;
1719
1720                 if (rq_data_dir(cur) != rq_data_dir(next))
1721                         break;
1722
1723                 if (mmc_req_rel_wr(next) &&
1724                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1725                         break;
1726
1727                 req_sectors += blk_rq_sectors(next);
1728                 if (req_sectors > max_blk_count)
1729                         break;
1730
1731                 phys_segments +=  next->nr_phys_segments;
1732                 if (phys_segments > max_phys_segs)
1733                         break;
1734
1735                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1736                 cur = next;
1737                 reqs++;
1738         } while (1);
1739
1740         if (put_back) {
1741                 spin_lock_irq(q->queue_lock);
1742                 blk_requeue_request(q, next);
1743                 spin_unlock_irq(q->queue_lock);
1744         }
1745
1746         if (reqs > 0) {
1747                 list_add(&req->queuelist, &mqrq->packed->list);
1748                 mqrq->packed->nr_entries = ++reqs;
1749                 mqrq->packed->retries = reqs;
1750                 return reqs;
1751         }
1752
1753 no_packed:
1754         mqrq->cmd_type = MMC_PACKED_NONE;
1755         return 0;
1756 }
1757
1758 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1759                                         struct mmc_card *card,
1760                                         struct mmc_queue *mq)
1761 {
1762         struct mmc_blk_request *brq = &mqrq->brq;
1763         struct request *req = mqrq->req;
1764         struct request *prq;
1765         struct mmc_blk_data *md = mq->data;
1766         struct mmc_packed *packed = mqrq->packed;
1767         bool do_rel_wr, do_data_tag;
1768         u32 *packed_cmd_hdr;
1769         u8 hdr_blocks;
1770         u8 i = 1;
1771
1772         BUG_ON(!packed);
1773
1774         mqrq->cmd_type = MMC_PACKED_WRITE;
1775         packed->blocks = 0;
1776         packed->idx_failure = MMC_PACKED_NR_IDX;
1777
1778         packed_cmd_hdr = packed->cmd_hdr;
1779         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1780         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1781                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1782         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1783
1784         /*
1785          * Argument for each entry of packed group
1786          */
1787         list_for_each_entry(prq, &packed->list, queuelist) {
1788                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1789                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1790                         (prq->cmd_flags & REQ_META) &&
1791                         (rq_data_dir(prq) == WRITE) &&
1792                         ((brq->data.blocks * brq->data.blksz) >=
1793                          card->ext_csd.data_tag_unit_size);
1794                 /* Argument of CMD23 */
1795                 packed_cmd_hdr[(i * 2)] =
1796                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1797                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1798                         blk_rq_sectors(prq);
1799                 /* Argument of CMD18 or CMD25 */
1800                 packed_cmd_hdr[((i * 2)) + 1] =
1801                         mmc_card_blockaddr(card) ?
1802                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1803                 packed->blocks += blk_rq_sectors(prq);
1804                 i++;
1805         }
1806
1807         memset(brq, 0, sizeof(struct mmc_blk_request));
1808         brq->mrq.cmd = &brq->cmd;
1809         brq->mrq.data = &brq->data;
1810         brq->mrq.sbc = &brq->sbc;
1811         brq->mrq.stop = &brq->stop;
1812
1813         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1814         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1815         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1816
1817         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1818         brq->cmd.arg = blk_rq_pos(req);
1819         if (!mmc_card_blockaddr(card))
1820                 brq->cmd.arg <<= 9;
1821         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1822
1823         brq->data.blksz = 512;
1824         brq->data.blocks = packed->blocks + hdr_blocks;
1825         brq->data.flags = MMC_DATA_WRITE;
1826
1827         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1828         brq->stop.arg = 0;
1829         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1830
1831         mmc_set_data_timeout(&brq->data, card);
1832
1833         brq->data.sg = mqrq->sg;
1834         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1835
1836         mqrq->mmc_active.mrq = &brq->mrq;
1837         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1838
1839         mmc_queue_bounce_pre(mqrq);
1840 }
1841
1842 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1843                            struct mmc_blk_request *brq, struct request *req,
1844                            int ret)
1845 {
1846         struct mmc_queue_req *mq_rq;
1847         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1848
1849         /*
1850          * If this is an SD card and we're writing, we can first
1851          * mark the known good sectors as ok.
1852          *
1853          * If the card is not SD, we can still ok written sectors
1854          * as reported by the controller (which might be less than
1855          * the real number of written sectors, but never more).
1856          */
1857         if (mmc_card_sd(card)) {
1858                 u32 blocks;
1859
1860                 blocks = mmc_sd_num_wr_blocks(card);
1861                 if (blocks != (u32)-1) {
1862                         ret = blk_end_request(req, 0, blocks << 9);
1863                 }
1864         } else {
1865                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1866                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1867         }
1868         return ret;
1869 }
1870
1871 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1872 {
1873         struct request *prq;
1874         struct mmc_packed *packed = mq_rq->packed;
1875         int idx = packed->idx_failure, i = 0;
1876         int ret = 0;
1877
1878         BUG_ON(!packed);
1879
1880         while (!list_empty(&packed->list)) {
1881                 prq = list_entry_rq(packed->list.next);
1882                 if (idx == i) {
1883                         /* retry from error index */
1884                         packed->nr_entries -= idx;
1885                         mq_rq->req = prq;
1886                         ret = 1;
1887
1888                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1889                                 list_del_init(&prq->queuelist);
1890                                 mmc_blk_clear_packed(mq_rq);
1891                         }
1892                         return ret;
1893                 }
1894                 list_del_init(&prq->queuelist);
1895                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1896                 i++;
1897         }
1898
1899         mmc_blk_clear_packed(mq_rq);
1900         return ret;
1901 }
1902
1903 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1904 {
1905         struct request *prq;
1906         struct mmc_packed *packed = mq_rq->packed;
1907
1908         BUG_ON(!packed);
1909
1910         while (!list_empty(&packed->list)) {
1911                 prq = list_entry_rq(packed->list.next);
1912                 list_del_init(&prq->queuelist);
1913                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1914         }
1915
1916         mmc_blk_clear_packed(mq_rq);
1917 }
1918
1919 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1920                                       struct mmc_queue_req *mq_rq)
1921 {
1922         struct request *prq;
1923         struct request_queue *q = mq->queue;
1924         struct mmc_packed *packed = mq_rq->packed;
1925
1926         BUG_ON(!packed);
1927
1928         while (!list_empty(&packed->list)) {
1929                 prq = list_entry_rq(packed->list.prev);
1930                 if (prq->queuelist.prev != &packed->list) {
1931                         list_del_init(&prq->queuelist);
1932                         spin_lock_irq(q->queue_lock);
1933                         blk_requeue_request(mq->queue, prq);
1934                         spin_unlock_irq(q->queue_lock);
1935                 } else {
1936                         list_del_init(&prq->queuelist);
1937                 }
1938         }
1939
1940         mmc_blk_clear_packed(mq_rq);
1941 }
1942
1943 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1944 {
1945         struct mmc_blk_data *md = mq->data;
1946         struct mmc_card *card = md->queue.card;
1947         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1948         int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1949         enum mmc_blk_status status;
1950         struct mmc_queue_req *mq_rq;
1951         struct request *req = rqc;
1952         struct mmc_async_req *areq;
1953         const u8 packed_nr = 2;
1954         u8 reqs = 0;
1955
1956         if (!rqc && !mq->mqrq_prev->req)
1957                 return 0;
1958
1959         if (rqc)
1960                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1961
1962         do {
1963                 if (rqc) {
1964                         /*
1965                          * When 4KB native sector is enabled, only 8 blocks
1966                          * multiple read or write is allowed
1967                          */
1968                         if ((brq->data.blocks & 0x07) &&
1969                             (card->ext_csd.data_sector_size == 4096)) {
1970                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1971                                         req->rq_disk->disk_name);
1972                                 mq_rq = mq->mqrq_cur;
1973                                 goto cmd_abort;
1974                         }
1975
1976                         if (reqs >= packed_nr)
1977                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1978                                                             card, mq);
1979                         else
1980                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1981                         areq = &mq->mqrq_cur->mmc_active;
1982                 } else
1983                         areq = NULL;
1984                 areq = mmc_start_req(card->host, areq, (int *) &status);
1985                 if (!areq) {
1986                         if (status == MMC_BLK_NEW_REQUEST)
1987                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1988                         return 0;
1989                 }
1990
1991                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1992                 brq = &mq_rq->brq;
1993                 req = mq_rq->req;
1994                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1995                 mmc_queue_bounce_post(mq_rq);
1996
1997                 switch (status) {
1998                 case MMC_BLK_SUCCESS:
1999                 case MMC_BLK_PARTIAL:
2000                         /*
2001                          * A block was successfully transferred.
2002                          */
2003                         mmc_blk_reset_success(md, type);
2004
2005                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2006                                 ret = mmc_blk_end_packed_req(mq_rq);
2007                                 break;
2008                         } else {
2009                                 ret = blk_end_request(req, 0,
2010                                                 brq->data.bytes_xfered);
2011                         }
2012
2013                         /*
2014                          * If the blk_end_request function returns non-zero even
2015                          * though all data has been transferred and no errors
2016                          * were returned by the host controller, it's a bug.
2017                          */
2018                         if (status == MMC_BLK_SUCCESS && ret) {
2019                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
2020                                        __func__, blk_rq_bytes(req),
2021                                        brq->data.bytes_xfered);
2022                                 rqc = NULL;
2023                                 goto cmd_abort;
2024                         }
2025                         break;
2026                 case MMC_BLK_CMD_ERR:
2027                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
2028                         if (mmc_blk_reset(md, card->host, type))
2029                                 goto cmd_abort;
2030                         if (!ret)
2031                                 goto start_new_req;
2032                         break;
2033                 case MMC_BLK_RETRY:
2034                         retune_retry_done = brq->retune_retry_done;
2035                         if (retry++ < 5)
2036                                 break;
2037                         /* Fall through */
2038                 case MMC_BLK_ABORT:
2039                         if (!mmc_blk_reset(md, card->host, type))
2040                                 break;
2041                         goto cmd_abort;
2042                 case MMC_BLK_DATA_ERR: {
2043                         int err;
2044
2045                         err = mmc_blk_reset(md, card->host, type);
2046                         if (!err)
2047                                 break;
2048                         if (err == -ENODEV ||
2049                                 mmc_packed_cmd(mq_rq->cmd_type))
2050                                 goto cmd_abort;
2051                         /* Fall through */
2052                 }
2053                 case MMC_BLK_ECC_ERR:
2054                         if (brq->data.blocks > 1) {
2055                                 /* Redo read one sector at a time */
2056                                 pr_warn("%s: retrying using single block read\n",
2057                                         req->rq_disk->disk_name);
2058                                 disable_multi = 1;
2059                                 break;
2060                         }
2061                         /*
2062                          * After an error, we redo I/O one sector at a
2063                          * time, so we only reach here after trying to
2064                          * read a single sector.
2065                          */
2066                         ret = blk_end_request(req, -EIO,
2067                                                 brq->data.blksz);
2068                         if (!ret)
2069                                 goto start_new_req;
2070                         break;
2071                 case MMC_BLK_NOMEDIUM:
2072                         goto cmd_abort;
2073                 default:
2074                         pr_err("%s: Unhandled return value (%d)",
2075                                         req->rq_disk->disk_name, status);
2076                         goto cmd_abort;
2077                 }
2078
2079                 if (ret) {
2080                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2081                                 if (!mq_rq->packed->retries)
2082                                         goto cmd_abort;
2083                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
2084                                 mmc_start_req(card->host,
2085                                               &mq_rq->mmc_active, NULL);
2086                         } else {
2087
2088                                 /*
2089                                  * In case of a incomplete request
2090                                  * prepare it again and resend.
2091                                  */
2092                                 mmc_blk_rw_rq_prep(mq_rq, card,
2093                                                 disable_multi, mq);
2094                                 mmc_start_req(card->host,
2095                                                 &mq_rq->mmc_active, NULL);
2096                         }
2097                         mq_rq->brq.retune_retry_done = retune_retry_done;
2098                 }
2099         } while (ret);
2100
2101         return 1;
2102
2103  cmd_abort:
2104         if (mmc_packed_cmd(mq_rq->cmd_type)) {
2105                 mmc_blk_abort_packed_req(mq_rq);
2106         } else {
2107                 if (mmc_card_removed(card))
2108                         req->cmd_flags |= REQ_QUIET;
2109                 while (ret)
2110                         ret = blk_end_request(req, -EIO,
2111                                         blk_rq_cur_bytes(req));
2112         }
2113
2114  start_new_req:
2115         if (rqc) {
2116                 if (mmc_card_removed(card)) {
2117                         rqc->cmd_flags |= REQ_QUIET;
2118                         blk_end_request_all(rqc, -EIO);
2119                 } else {
2120                         /*
2121                          * If current request is packed, it needs to put back.
2122                          */
2123                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
2124                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
2125
2126                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
2127                         mmc_start_req(card->host,
2128                                       &mq->mqrq_cur->mmc_active, NULL);
2129                 }
2130         }
2131
2132         return 0;
2133 }
2134
2135 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
2136 {
2137         int ret;
2138         struct mmc_blk_data *md = mq->data;
2139         struct mmc_card *card = md->queue.card;
2140         struct mmc_host *host = card->host;
2141         unsigned long flags;
2142         unsigned int cmd_flags = req ? req->cmd_flags : 0;
2143
2144         if (req && !mq->mqrq_prev->req)
2145                 /* claim host only for the first request */
2146                 mmc_get_card(card);
2147
2148         ret = mmc_blk_part_switch(card, md);
2149         if (ret) {
2150                 if (req) {
2151                         blk_end_request_all(req, -EIO);
2152                 }
2153                 ret = 0;
2154                 goto out;
2155         }
2156
2157         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
2158         if (cmd_flags & REQ_DISCARD) {
2159                 /* complete ongoing async transfer before issuing discard */
2160                 if (card->host->areq)
2161                         mmc_blk_issue_rw_rq(mq, NULL);
2162                 if (req->cmd_flags & REQ_SECURE)
2163                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
2164                 else
2165                         ret = mmc_blk_issue_discard_rq(mq, req);
2166         } else if (cmd_flags & REQ_FLUSH) {
2167                 /* complete ongoing async transfer before issuing flush */
2168                 if (card->host->areq)
2169                         mmc_blk_issue_rw_rq(mq, NULL);
2170                 ret = mmc_blk_issue_flush(mq, req);
2171         } else {
2172                 if (!req && host->areq) {
2173                         spin_lock_irqsave(&host->context_info.lock, flags);
2174                         host->context_info.is_waiting_last_req = true;
2175                         spin_unlock_irqrestore(&host->context_info.lock, flags);
2176                 }
2177                 ret = mmc_blk_issue_rw_rq(mq, req);
2178         }
2179
2180 out:
2181         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
2182              (cmd_flags & MMC_REQ_SPECIAL_MASK))
2183                 /*
2184                  * Release host when there are no more requests
2185                  * and after special request(discard, flush) is done.
2186                  * In case sepecial request, there is no reentry to
2187                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
2188                  */
2189                 mmc_put_card(card);
2190         return ret;
2191 }
2192
2193 static inline int mmc_blk_readonly(struct mmc_card *card)
2194 {
2195         return mmc_card_readonly(card) ||
2196                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2197 }
2198
2199 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2200                                               struct device *parent,
2201                                               sector_t size,
2202                                               bool default_ro,
2203                                               const char *subname,
2204                                               int area_type)
2205 {
2206         struct mmc_blk_data *md;
2207         int devidx, ret;
2208
2209 again:
2210         if (!ida_pre_get(&mmc_blk_ida, GFP_KERNEL))
2211                 return ERR_PTR(-ENOMEM);
2212
2213         spin_lock(&mmc_blk_lock);
2214         ret = ida_get_new(&mmc_blk_ida, &devidx);
2215         spin_unlock(&mmc_blk_lock);
2216
2217         if (ret == -EAGAIN)
2218                 goto again;
2219         else if (ret)
2220                 return ERR_PTR(ret);
2221
2222         if (devidx >= max_devices) {
2223                 ret = -ENOSPC;
2224                 goto out;
2225         }
2226
2227         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2228         if (!md) {
2229                 ret = -ENOMEM;
2230                 goto out;
2231         }
2232
2233         md->area_type = area_type;
2234
2235         /*
2236          * Set the read-only status based on the supported commands
2237          * and the write protect switch.
2238          */
2239         md->read_only = mmc_blk_readonly(card);
2240
2241         md->disk = alloc_disk(perdev_minors);
2242         if (md->disk == NULL) {
2243                 ret = -ENOMEM;
2244                 goto err_kfree;
2245         }
2246
2247         spin_lock_init(&md->lock);
2248         INIT_LIST_HEAD(&md->part);
2249         md->usage = 1;
2250
2251         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2252         if (ret)
2253                 goto err_putdisk;
2254
2255         md->queue.issue_fn = mmc_blk_issue_rq;
2256         md->queue.data = md;
2257
2258         md->disk->major = MMC_BLOCK_MAJOR;
2259         md->disk->first_minor = devidx * perdev_minors;
2260         md->disk->fops = &mmc_bdops;
2261         md->disk->private_data = md;
2262         md->disk->queue = md->queue.queue;
2263         md->disk->driverfs_dev = parent;
2264         set_disk_ro(md->disk, md->read_only || default_ro);
2265         md->disk->flags = GENHD_FL_EXT_DEVT;
2266         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2267                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2268
2269         /*
2270          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2271          *
2272          * - be set for removable media with permanent block devices
2273          * - be unset for removable block devices with permanent media
2274          *
2275          * Since MMC block devices clearly fall under the second
2276          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2277          * should use the block device creation/destruction hotplug
2278          * messages to tell when the card is present.
2279          */
2280
2281         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2282                  "mmcblk%u%s", card->host->index, subname ? subname : "");
2283
2284         if (mmc_card_mmc(card))
2285                 blk_queue_logical_block_size(md->queue.queue,
2286                                              card->ext_csd.data_sector_size);
2287         else
2288                 blk_queue_logical_block_size(md->queue.queue, 512);
2289
2290         set_capacity(md->disk, size);
2291
2292         if (mmc_host_cmd23(card->host)) {
2293                 if (mmc_card_mmc(card) ||
2294                     (mmc_card_sd(card) &&
2295                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2296                         md->flags |= MMC_BLK_CMD23;
2297         }
2298
2299         if (mmc_card_mmc(card) &&
2300             md->flags & MMC_BLK_CMD23 &&
2301             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2302              card->ext_csd.rel_sectors)) {
2303                 md->flags |= MMC_BLK_REL_WR;
2304                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2305         }
2306
2307         if (mmc_card_mmc(card) &&
2308             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2309             (md->flags & MMC_BLK_CMD23) &&
2310             card->ext_csd.packed_event_en) {
2311                 if (!mmc_packed_init(&md->queue, card))
2312                         md->flags |= MMC_BLK_PACKED_CMD;
2313         }
2314
2315         return md;
2316
2317  err_putdisk:
2318         put_disk(md->disk);
2319  err_kfree:
2320         kfree(md);
2321  out:
2322         spin_lock(&mmc_blk_lock);
2323         ida_remove(&mmc_blk_ida, devidx);
2324         spin_unlock(&mmc_blk_lock);
2325         return ERR_PTR(ret);
2326 }
2327
2328 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2329 {
2330         sector_t size;
2331
2332         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2333                 /*
2334                  * The EXT_CSD sector count is in number or 512 byte
2335                  * sectors.
2336                  */
2337                 size = card->ext_csd.sectors;
2338         } else {
2339                 /*
2340                  * The CSD capacity field is in units of read_blkbits.
2341                  * set_capacity takes units of 512 bytes.
2342                  */
2343                 size = (typeof(sector_t))card->csd.capacity
2344                         << (card->csd.read_blkbits - 9);
2345         }
2346
2347         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2348                                         MMC_BLK_DATA_AREA_MAIN);
2349 }
2350
2351 static int mmc_blk_alloc_part(struct mmc_card *card,
2352                               struct mmc_blk_data *md,
2353                               unsigned int part_type,
2354                               sector_t size,
2355                               bool default_ro,
2356                               const char *subname,
2357                               int area_type)
2358 {
2359         char cap_str[10];
2360         struct mmc_blk_data *part_md;
2361
2362         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2363                                     subname, area_type);
2364         if (IS_ERR(part_md))
2365                 return PTR_ERR(part_md);
2366         part_md->part_type = part_type;
2367         list_add(&part_md->part, &md->part);
2368
2369         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2370                         cap_str, sizeof(cap_str));
2371         pr_info("%s: %s %s partition %u %s\n",
2372                part_md->disk->disk_name, mmc_card_id(card),
2373                mmc_card_name(card), part_md->part_type, cap_str);
2374         return 0;
2375 }
2376
2377 /* MMC Physical partitions consist of two boot partitions and
2378  * up to four general purpose partitions.
2379  * For each partition enabled in EXT_CSD a block device will be allocatedi
2380  * to provide access to the partition.
2381  */
2382
2383 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2384 {
2385         int idx, ret = 0;
2386
2387         if (!mmc_card_mmc(card))
2388                 return 0;
2389
2390         for (idx = 0; idx < card->nr_parts; idx++) {
2391                 if (card->part[idx].size) {
2392                         ret = mmc_blk_alloc_part(card, md,
2393                                 card->part[idx].part_cfg,
2394                                 card->part[idx].size >> 9,
2395                                 card->part[idx].force_ro,
2396                                 card->part[idx].name,
2397                                 card->part[idx].area_type);
2398                         if (ret)
2399                                 return ret;
2400                 }
2401         }
2402
2403         return ret;
2404 }
2405
2406 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2407 {
2408         struct mmc_card *card;
2409
2410         if (md) {
2411                 /*
2412                  * Flush remaining requests and free queues. It
2413                  * is freeing the queue that stops new requests
2414                  * from being accepted.
2415                  */
2416                 card = md->queue.card;
2417                 mmc_cleanup_queue(&md->queue);
2418                 if (md->flags & MMC_BLK_PACKED_CMD)
2419                         mmc_packed_clean(&md->queue);
2420                 if (md->disk->flags & GENHD_FL_UP) {
2421                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2422                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2423                                         card->ext_csd.boot_ro_lockable)
2424                                 device_remove_file(disk_to_dev(md->disk),
2425                                         &md->power_ro_lock);
2426
2427                         del_gendisk(md->disk);
2428                 }
2429                 mmc_blk_put(md);
2430         }
2431 }
2432
2433 static void mmc_blk_remove_parts(struct mmc_card *card,
2434                                  struct mmc_blk_data *md)
2435 {
2436         struct list_head *pos, *q;
2437         struct mmc_blk_data *part_md;
2438
2439         list_for_each_safe(pos, q, &md->part) {
2440                 part_md = list_entry(pos, struct mmc_blk_data, part);
2441                 list_del(pos);
2442                 mmc_blk_remove_req(part_md);
2443         }
2444 }
2445
2446 static int mmc_add_disk(struct mmc_blk_data *md)
2447 {
2448         int ret;
2449         struct mmc_card *card = md->queue.card;
2450
2451         add_disk(md->disk);
2452         md->force_ro.show = force_ro_show;
2453         md->force_ro.store = force_ro_store;
2454         sysfs_attr_init(&md->force_ro.attr);
2455         md->force_ro.attr.name = "force_ro";
2456         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2457         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2458         if (ret)
2459                 goto force_ro_fail;
2460
2461         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2462              card->ext_csd.boot_ro_lockable) {
2463                 umode_t mode;
2464
2465                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2466                         mode = S_IRUGO;
2467                 else
2468                         mode = S_IRUGO | S_IWUSR;
2469
2470                 md->power_ro_lock.show = power_ro_lock_show;
2471                 md->power_ro_lock.store = power_ro_lock_store;
2472                 sysfs_attr_init(&md->power_ro_lock.attr);
2473                 md->power_ro_lock.attr.mode = mode;
2474                 md->power_ro_lock.attr.name =
2475                                         "ro_lock_until_next_power_on";
2476                 ret = device_create_file(disk_to_dev(md->disk),
2477                                 &md->power_ro_lock);
2478                 if (ret)
2479                         goto power_ro_lock_fail;
2480         }
2481         return ret;
2482
2483 power_ro_lock_fail:
2484         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2485 force_ro_fail:
2486         del_gendisk(md->disk);
2487
2488         return ret;
2489 }
2490
2491 #define CID_MANFID_SANDISK      0x2
2492 #define CID_MANFID_TOSHIBA      0x11
2493 #define CID_MANFID_MICRON       0x13
2494 #define CID_MANFID_SAMSUNG      0x15
2495 #define CID_MANFID_KINGSTON     0x70
2496
2497 static const struct mmc_fixup blk_fixups[] =
2498 {
2499         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2500                   MMC_QUIRK_INAND_CMD38),
2501         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2502                   MMC_QUIRK_INAND_CMD38),
2503         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2504                   MMC_QUIRK_INAND_CMD38),
2505         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2506                   MMC_QUIRK_INAND_CMD38),
2507         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2508                   MMC_QUIRK_INAND_CMD38),
2509
2510         /*
2511          * Some MMC cards experience performance degradation with CMD23
2512          * instead of CMD12-bounded multiblock transfers. For now we'll
2513          * black list what's bad...
2514          * - Certain Toshiba cards.
2515          *
2516          * N.B. This doesn't affect SD cards.
2517          */
2518         MMC_FIXUP("SDMB-32", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2519                   MMC_QUIRK_BLK_NO_CMD23),
2520         MMC_FIXUP("SDM032", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2521                   MMC_QUIRK_BLK_NO_CMD23),
2522         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2523                   MMC_QUIRK_BLK_NO_CMD23),
2524         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2525                   MMC_QUIRK_BLK_NO_CMD23),
2526         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2527                   MMC_QUIRK_BLK_NO_CMD23),
2528
2529         /*
2530          * Some Micron MMC cards needs longer data read timeout than
2531          * indicated in CSD.
2532          */
2533         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2534                   MMC_QUIRK_LONG_READ_TIME),
2535
2536         /*
2537          * On these Samsung MoviNAND parts, performing secure erase or
2538          * secure trim can result in unrecoverable corruption due to a
2539          * firmware bug.
2540          */
2541         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2542                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2543         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2544                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2545         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2546                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2547         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2548                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2549         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2550                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2551         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2552                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2553         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2554                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2555         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2556                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2557
2558         /*
2559          *  On Some Kingston eMMCs, performing trim can result in
2560          *  unrecoverable data conrruption occasionally due to a firmware bug.
2561          */
2562         MMC_FIXUP("V10008", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2563                   MMC_QUIRK_TRIM_BROKEN),
2564         MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2565                   MMC_QUIRK_TRIM_BROKEN),
2566
2567         END_FIXUP
2568 };
2569
2570 static int mmc_blk_probe(struct mmc_card *card)
2571 {
2572         struct mmc_blk_data *md, *part_md;
2573         char cap_str[10];
2574
2575         /*
2576          * Check that the card supports the command class(es) we need.
2577          */
2578         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2579                 return -ENODEV;
2580
2581         mmc_fixup_device(card, blk_fixups);
2582
2583         md = mmc_blk_alloc(card);
2584         if (IS_ERR(md))
2585                 return PTR_ERR(md);
2586
2587         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2588                         cap_str, sizeof(cap_str));
2589         pr_info("%s: %s %s %s %s\n",
2590                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2591                 cap_str, md->read_only ? "(ro)" : "");
2592
2593         if (mmc_blk_alloc_parts(card, md))
2594                 goto out;
2595
2596         dev_set_drvdata(&card->dev, md);
2597
2598         if (mmc_add_disk(md))
2599                 goto out;
2600
2601         list_for_each_entry(part_md, &md->part, part) {
2602                 if (mmc_add_disk(part_md))
2603                         goto out;
2604         }
2605
2606         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2607         pm_runtime_use_autosuspend(&card->dev);
2608
2609         /*
2610          * Don't enable runtime PM for SD-combo cards here. Leave that
2611          * decision to be taken during the SDIO init sequence instead.
2612          */
2613         if (card->type != MMC_TYPE_SD_COMBO) {
2614                 pm_runtime_set_active(&card->dev);
2615                 pm_runtime_enable(&card->dev);
2616         }
2617
2618         return 0;
2619
2620  out:
2621         mmc_blk_remove_parts(card, md);
2622         mmc_blk_remove_req(md);
2623         return 0;
2624 }
2625
2626 static void mmc_blk_remove(struct mmc_card *card)
2627 {
2628         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2629
2630         mmc_blk_remove_parts(card, md);
2631         pm_runtime_get_sync(&card->dev);
2632         mmc_claim_host(card->host);
2633         mmc_blk_part_switch(card, md);
2634         mmc_release_host(card->host);
2635         if (card->type != MMC_TYPE_SD_COMBO)
2636                 pm_runtime_disable(&card->dev);
2637         pm_runtime_put_noidle(&card->dev);
2638         mmc_blk_remove_req(md);
2639         dev_set_drvdata(&card->dev, NULL);
2640 }
2641
2642 static int _mmc_blk_suspend(struct mmc_card *card)
2643 {
2644         struct mmc_blk_data *part_md;
2645         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2646
2647         if (md) {
2648                 mmc_queue_suspend(&md->queue);
2649                 list_for_each_entry(part_md, &md->part, part) {
2650                         mmc_queue_suspend(&part_md->queue);
2651                 }
2652         }
2653         return 0;
2654 }
2655
2656 static void mmc_blk_shutdown(struct mmc_card *card)
2657 {
2658         _mmc_blk_suspend(card);
2659 }
2660
2661 #ifdef CONFIG_PM_SLEEP
2662 static int mmc_blk_suspend(struct device *dev)
2663 {
2664         struct mmc_card *card = mmc_dev_to_card(dev);
2665
2666         return _mmc_blk_suspend(card);
2667 }
2668
2669 static int mmc_blk_resume(struct device *dev)
2670 {
2671         struct mmc_blk_data *part_md;
2672         struct mmc_blk_data *md = dev_get_drvdata(dev);
2673
2674         if (md) {
2675                 /*
2676                  * Resume involves the card going into idle state,
2677                  * so current partition is always the main one.
2678                  */
2679                 md->part_curr = md->part_type;
2680                 mmc_queue_resume(&md->queue);
2681                 list_for_each_entry(part_md, &md->part, part) {
2682                         mmc_queue_resume(&part_md->queue);
2683                 }
2684         }
2685         return 0;
2686 }
2687 #endif
2688
2689 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2690
2691 static struct mmc_driver mmc_driver = {
2692         .drv            = {
2693                 .name   = "mmcblk",
2694                 .pm     = &mmc_blk_pm_ops,
2695         },
2696         .probe          = mmc_blk_probe,
2697         .remove         = mmc_blk_remove,
2698         .shutdown       = mmc_blk_shutdown,
2699 };
2700
2701 static int __init mmc_blk_init(void)
2702 {
2703         int res;
2704
2705         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2706                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2707
2708         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2709
2710         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2711         if (res)
2712                 goto out;
2713
2714         res = mmc_register_driver(&mmc_driver);
2715         if (res)
2716                 goto out2;
2717
2718         return 0;
2719  out2:
2720         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2721  out:
2722         return res;
2723 }
2724
2725 static void __exit mmc_blk_exit(void)
2726 {
2727         mmc_unregister_driver(&mmc_driver);
2728         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2729 }
2730
2731 module_init(mmc_blk_init);
2732 module_exit(mmc_blk_exit);
2733
2734 MODULE_LICENSE("GPL");
2735 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2736