drivers/mmc/core/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 #include "block.h"
  50
  51 MODULE_ALIAS("mmc:block");
  52 #ifdef MODULE_PARAM_PREFIX
  53 #undef MODULE_PARAM_PREFIX
  54 #endif
  55 #define MODULE_PARAM_PREFIX "mmcblk."
  56
  57 #define INAND_CMD38_ARG_EXT_CSD  113
  58 #define INAND_CMD38_ARG_ERASE    0x00
  59 #define INAND_CMD38_ARG_TRIM     0x01
  60 #define INAND_CMD38_ARG_SECERASE 0x80
  61 #define INAND_CMD38_ARG_SECTRIM1 0x81
  62 #define INAND_CMD38_ARG_SECTRIM2 0x88
  63 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  64 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  65 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  66
  67 #define mmc_req_rel_wr(req)     ((req->cmd_flags & REQ_FUA) && \
  68                                   (rq_data_dir(req) == WRITE))
  69 static DEFINE_MUTEX(block_mutex);
  70
  71 /*
  72  * The defaults come from config options but can be overriden by module
  73  * or bootarg options.
  74  */
  75 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  76
  77 /*
  78  * We've only got one major, so number of mmcblk devices is
  79  * limited to (1 << 20) / number of minors per device.  It is also
  80  * limited by the MAX_DEVICES below.
  81  */
  82 static int max_devices;
  83
  84 #define MAX_DEVICES 256
  85
  86 static DEFINE_IDA(mmc_blk_ida);
  87 static DEFINE_SPINLOCK(mmc_blk_lock);
  88
  89 /*
  90  * There is one mmc_blk_data per slot.
  91  */
  92 struct mmc_blk_data {
  93         spinlock_t      lock;
  94         struct device   *parent;
  95         struct gendisk  *disk;
  96         struct mmc_queue queue;
  97         struct list_head part;
  98
  99         unsigned int    flags;
 100 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
 101 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
 102
 103         unsigned int    usage;
 104         unsigned int    read_only;
 105         unsigned int    part_type;
 106         unsigned int    reset_done;
 107 #define MMC_BLK_READ            BIT(0)
 108 #define MMC_BLK_WRITE           BIT(1)
 109 #define MMC_BLK_DISCARD         BIT(2)
 110 #define MMC_BLK_SECDISCARD      BIT(3)
 111
 112         /*
 113          * Only set in main mmc_blk_data associated
 114          * with mmc_card with dev_set_drvdata, and keeps
 115          * track of the current selected device partition.
 116          */
 117         unsigned int    part_curr;
 118         struct device_attribute force_ro;
 119         struct device_attribute power_ro_lock;
 120         int     area_type;
 121 };
 122
 123 static DEFINE_MUTEX(open_lock);
 124
 125 module_param(perdev_minors, int, 0444);
 126 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
 127
 128 static inline int mmc_blk_part_switch(struct mmc_card *card,
 129                                       struct mmc_blk_data *md);
 130 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
 131
 132 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 133 {
 134         struct mmc_blk_data *md;
 135
 136         mutex_lock(&open_lock);
 137         md = disk->private_data;
 138         if (md && md->usage == 0)
 139                 md = NULL;
 140         if (md)
 141                 md->usage++;
 142         mutex_unlock(&open_lock);
 143
 144         return md;
 145 }
 146
 147 static inline int mmc_get_devidx(struct gendisk *disk)
 148 {
 149         int devidx = disk->first_minor / perdev_minors;
 150         return devidx;
 151 }
 152
 153 static void mmc_blk_put(struct mmc_blk_data *md)
 154 {
 155         mutex_lock(&open_lock);
 156         md->usage--;
 157         if (md->usage == 0) {
 158                 int devidx = mmc_get_devidx(md->disk);
 159                 blk_cleanup_queue(md->queue.queue);
 160
 161                 spin_lock(&mmc_blk_lock);
 162                 ida_remove(&mmc_blk_ida, devidx);
 163                 spin_unlock(&mmc_blk_lock);
 164
 165                 put_disk(md->disk);
 166                 kfree(md);
 167         }
 168         mutex_unlock(&open_lock);
 169 }
 170
 171 static ssize_t power_ro_lock_show(struct device *dev,
 172                 struct device_attribute *attr, char *buf)
 173 {
 174         int ret;
 175         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 176         struct mmc_card *card = md->queue.card;
 177         int locked = 0;
 178
 179         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 180                 locked = 2;
 181         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 182                 locked = 1;
 183
 184         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 185
 186         mmc_blk_put(md);
 187
 188         return ret;
 189 }
 190
 191 static ssize_t power_ro_lock_store(struct device *dev,
 192                 struct device_attribute *attr, const char *buf, size_t count)
 193 {
 194         int ret;
 195         struct mmc_blk_data *md, *part_md;
 196         struct mmc_card *card;
 197         unsigned long set;
 198
 199         if (kstrtoul(buf, 0, &set))
 200                 return -EINVAL;
 201
 202         if (set != 1)
 203                 return count;
 204
 205         md = mmc_blk_get(dev_to_disk(dev));
 206         card = md->queue.card;
 207
 208         mmc_get_card(card);
 209
 210         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
 211                                 card->ext_csd.boot_ro_lock |
 212                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
 213                                 card->ext_csd.part_time);
 214         if (ret)
 215                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
 216         else
 217                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
 218
 219         mmc_put_card(card);
 220
 221         if (!ret) {
 222                 pr_info("%s: Locking boot partition ro until next power on\n",
 223                         md->disk->disk_name);
 224                 set_disk_ro(md->disk, 1);
 225
 226                 list_for_each_entry(part_md, &md->part, part)
 227                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 228                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 229                                 set_disk_ro(part_md->disk, 1);
 230                         }
 231         }
 232
 233         mmc_blk_put(md);
 234         return count;
 235 }
 236
 237 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 238                              char *buf)
 239 {
 240         int ret;
 241         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 242
 243         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 244                        get_disk_ro(dev_to_disk(dev)) ^
 245                        md->read_only);
 246         mmc_blk_put(md);
 247         return ret;
 248 }
 249
 250 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 251                               const char *buf, size_t count)
 252 {
 253         int ret;
 254         char *end;
 255         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 256         unsigned long set = simple_strtoul(buf, &end, 0);
 257         if (end == buf) {
 258                 ret = -EINVAL;
 259                 goto out;
 260         }
 261
 262         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 263         ret = count;
 264 out:
 265         mmc_blk_put(md);
 266         return ret;
 267 }
 268
 269 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 270 {
 271         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 272         int ret = -ENXIO;
 273
 274         mutex_lock(&block_mutex);
 275         if (md) {
 276                 if (md->usage == 2)
 277                         check_disk_change(bdev);
 278                 ret = 0;
 279
 280                 if ((mode & FMODE_WRITE) && md->read_only) {
 281                         mmc_blk_put(md);
 282                         ret = -EROFS;
 283                 }
 284         }
 285         mutex_unlock(&block_mutex);
 286
 287         return ret;
 288 }
 289
 290 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 291 {
 292         struct mmc_blk_data *md = disk->private_data;
 293
 294         mutex_lock(&block_mutex);
 295         mmc_blk_put(md);
 296         mutex_unlock(&block_mutex);
 297 }
 298
 299 static int
 300 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 301 {
 302         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 303         geo->heads = 4;
 304         geo->sectors = 16;
 305         return 0;
 306 }
 307
 308 struct mmc_blk_ioc_data {
 309         struct mmc_ioc_cmd ic;
 310         unsigned char *buf;
 311         u64 buf_bytes;
 312 };
 313
 314 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 315         struct mmc_ioc_cmd __user *user)
 316 {
 317         struct mmc_blk_ioc_data *idata;
 318         int err;
 319
 320         idata = kmalloc(sizeof(*idata), GFP_KERNEL);
 321         if (!idata) {
 322                 err = -ENOMEM;
 323                 goto out;
 324         }
 325
 326         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 327                 err = -EFAULT;
 328                 goto idata_err;
 329         }
 330
 331         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 332         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 333                 err = -EOVERFLOW;
 334                 goto idata_err;
 335         }
 336
 337         if (!idata->buf_bytes) {
 338                 idata->buf = NULL;
 339                 return idata;
 340         }
 341
 342         idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
 343         if (!idata->buf) {
 344                 err = -ENOMEM;
 345                 goto idata_err;
 346         }
 347
 348         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 349                                         idata->ic.data_ptr, idata->buf_bytes)) {
 350                 err = -EFAULT;
 351                 goto copy_err;
 352         }
 353
 354         return idata;
 355
 356 copy_err:
 357         kfree(idata->buf);
 358 idata_err:
 359         kfree(idata);
 360 out:
 361         return ERR_PTR(err);
 362 }
 363
 364 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
 365                                       struct mmc_blk_ioc_data *idata)
 366 {
 367         struct mmc_ioc_cmd *ic = &idata->ic;
 368
 369         if (copy_to_user(&(ic_ptr->response), ic->response,
 370                          sizeof(ic->response)))
 371                 return -EFAULT;
 372
 373         if (!idata->ic.write_flag) {
 374                 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
 375                                  idata->buf, idata->buf_bytes))
 376                         return -EFAULT;
 377         }
 378
 379         return 0;
 380 }
 381
 382 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 383                                        u32 retries_max)
 384 {
 385         int err;
 386         u32 retry_count = 0;
 387
 388         if (!status || !retries_max)
 389                 return -EINVAL;
 390
 391         do {
 392                 err = get_card_status(card, status, 5);
 393                 if (err)
 394                         break;
 395
 396                 if (!R1_STATUS(*status) &&
 397                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 398                         break; /* RPMB programming operation complete */
 399
 400                 /*
 401                  * Rechedule to give the MMC device a chance to continue
 402                  * processing the previous command without being polled too
 403                  * frequently.
 404                  */
 405                 usleep_range(1000, 5000);
 406         } while (++retry_count < retries_max);
 407
 408         if (retry_count == retries_max)
 409                 err = -EPERM;
 410
 411         return err;
 412 }
 413
 414 static int ioctl_do_sanitize(struct mmc_card *card)
 415 {
 416         int err;
 417
 418         if (!mmc_can_sanitize(card)) {
 419                         pr_warn("%s: %s - SANITIZE is not supported\n",
 420                                 mmc_hostname(card->host), __func__);
 421                         err = -EOPNOTSUPP;
 422                         goto out;
 423         }
 424
 425         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 426                 mmc_hostname(card->host), __func__);
 427
 428         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 429                                         EXT_CSD_SANITIZE_START, 1,
 430                                         MMC_SANITIZE_REQ_TIMEOUT);
 431
 432         if (err)
 433                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 434                        mmc_hostname(card->host), __func__, err);
 435
 436         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 437                                              __func__);
 438 out:
 439         return err;
 440 }
 441
 442 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 443                                struct mmc_blk_ioc_data *idata)
 444 {
 445         struct mmc_command cmd = {0};
 446         struct mmc_data data = {0};
 447         struct mmc_request mrq = {NULL};
 448         struct scatterlist sg;
 449         int err;
 450         int is_rpmb = false;
 451         u32 status = 0;
 452
 453         if (!card || !md || !idata)
 454                 return -EINVAL;
 455
 456         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 457                 is_rpmb = true;
 458
 459         cmd.opcode = idata->ic.opcode;
 460         cmd.arg = idata->ic.arg;
 461         cmd.flags = idata->ic.flags;
 462
 463         if (idata->buf_bytes) {
 464                 data.sg = &sg;
 465                 data.sg_len = 1;
 466                 data.blksz = idata->ic.blksz;
 467                 data.blocks = idata->ic.blocks;
 468
 469                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 470
 471                 if (idata->ic.write_flag)
 472                         data.flags = MMC_DATA_WRITE;
 473                 else
 474                         data.flags = MMC_DATA_READ;
 475
 476                 /* data.flags must already be set before doing this. */
 477                 mmc_set_data_timeout(&data, card);
 478
 479                 /* Allow overriding the timeout_ns for empirical tuning. */
 480                 if (idata->ic.data_timeout_ns)
 481                         data.timeout_ns = idata->ic.data_timeout_ns;
 482
 483                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 484                         /*
 485                          * Pretend this is a data transfer and rely on the
 486                          * host driver to compute timeout.  When all host
 487                          * drivers support cmd.cmd_timeout for R1B, this
 488                          * can be changed to:
 489                          *
 490                          *     mrq.data = NULL;
 491                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 492                          */
 493                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 494                 }
 495
 496                 mrq.data = &data;
 497         }
 498
 499         mrq.cmd = &cmd;
 500
 501         err = mmc_blk_part_switch(card, md);
 502         if (err)
 503                 return err;
 504
 505         if (idata->ic.is_acmd) {
 506                 err = mmc_app_cmd(card->host, card);
 507                 if (err)
 508                         return err;
 509         }
 510
 511         if (is_rpmb) {
 512                 err = mmc_set_blockcount(card, data.blocks,
 513                         idata->ic.write_flag & (1 << 31));
 514                 if (err)
 515                         return err;
 516         }
 517
 518         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 519             (cmd.opcode == MMC_SWITCH)) {
 520                 err = ioctl_do_sanitize(card);
 521
 522                 if (err)
 523                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 524                                __func__, err);
 525
 526                 return err;
 527         }
 528
 529         mmc_wait_for_req(card->host, &mrq);
 530
 531         if (cmd.error) {
 532                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 533                                                 __func__, cmd.error);
 534                 return cmd.error;
 535         }
 536         if (data.error) {
 537                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 538                                                 __func__, data.error);
 539                 return data.error;
 540         }
 541
 542         /*
 543          * According to the SD specs, some commands require a delay after
 544          * issuing the command.
 545          */
 546         if (idata->ic.postsleep_min_us)
 547                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 548
 549         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
 550
 551         if (is_rpmb) {
 552                 /*
 553                  * Ensure RPMB command has completed by polling CMD13
 554                  * "Send Status".
 555                  */
 556                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 557                 if (err)
 558                         dev_err(mmc_dev(card->host),
 559                                         "%s: Card Status=0x%08X, error %d\n",
 560                                         __func__, status, err);
 561         }
 562
 563         return err;
 564 }
 565
 566 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 567                              struct mmc_ioc_cmd __user *ic_ptr)
 568 {
 569         struct mmc_blk_ioc_data *idata;
 570         struct mmc_blk_data *md;
 571         struct mmc_card *card;
 572         int err = 0, ioc_err = 0;
 573
 574         /*
 575          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 576          * whole block device, not on a partition.  This prevents overspray
 577          * between sibling partitions.
 578          */
 579         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 580                 return -EPERM;
 581
 582         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 583         if (IS_ERR(idata))
 584                 return PTR_ERR(idata);
 585
 586         md = mmc_blk_get(bdev->bd_disk);
 587         if (!md) {
 588                 err = -EINVAL;
 589                 goto cmd_err;
 590         }
 591
 592         card = md->queue.card;
 593         if (IS_ERR(card)) {
 594                 err = PTR_ERR(card);
 595                 goto cmd_done;
 596         }
 597
 598         mmc_get_card(card);
 599
 600         ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
 601
 602         /* Always switch back to main area after RPMB access */
 603         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 604                 mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
 605
 606         mmc_put_card(card);
 607
 608         err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
 609
 610 cmd_done:
 611         mmc_blk_put(md);
 612 cmd_err:
 613         kfree(idata->buf);
 614         kfree(idata);
 615         return ioc_err ? ioc_err : err;
 616 }
 617
 618 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 619                                    struct mmc_ioc_multi_cmd __user *user)
 620 {
 621         struct mmc_blk_ioc_data **idata = NULL;
 622         struct mmc_ioc_cmd __user *cmds = user->cmds;
 623         struct mmc_card *card;
 624         struct mmc_blk_data *md;
 625         int i, err = 0, ioc_err = 0;
 626         __u64 num_of_cmds;
 627
 628         /*
 629          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 630          * whole block device, not on a partition.  This prevents overspray
 631          * between sibling partitions.
 632          */
 633         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 634                 return -EPERM;
 635
 636         if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
 637                            sizeof(num_of_cmds)))
 638                 return -EFAULT;
 639
 640         if (num_of_cmds > MMC_IOC_MAX_CMDS)
 641                 return -EINVAL;
 642
 643         idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
 644         if (!idata)
 645                 return -ENOMEM;
 646
 647         for (i = 0; i < num_of_cmds; i++) {
 648                 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
 649                 if (IS_ERR(idata[i])) {
 650                         err = PTR_ERR(idata[i]);
 651                         num_of_cmds = i;
 652                         goto cmd_err;
 653                 }
 654         }
 655
 656         md = mmc_blk_get(bdev->bd_disk);
 657         if (!md) {
 658                 err = -EINVAL;
 659                 goto cmd_err;
 660         }
 661
 662         card = md->queue.card;
 663         if (IS_ERR(card)) {
 664                 err = PTR_ERR(card);
 665                 goto cmd_done;
 666         }
 667
 668         mmc_get_card(card);
 669
 670         for (i = 0; i < num_of_cmds && !ioc_err; i++)
 671                 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 672
 673         /* Always switch back to main area after RPMB access */
 674         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 675                 mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
 676
 677         mmc_put_card(card);
 678
 679         /* copy to user if data and response */
 680         for (i = 0; i < num_of_cmds && !err; i++)
 681                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 682
 683 cmd_done:
 684         mmc_blk_put(md);
 685 cmd_err:
 686         for (i = 0; i < num_of_cmds; i++) {
 687                 kfree(idata[i]->buf);
 688                 kfree(idata[i]);
 689         }
 690         kfree(idata);
 691         return ioc_err ? ioc_err : err;
 692 }
 693
 694 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 695         unsigned int cmd, unsigned long arg)
 696 {
 697         switch (cmd) {
 698         case MMC_IOC_CMD:
 699                 return mmc_blk_ioctl_cmd(bdev,
 700                                 (struct mmc_ioc_cmd __user *)arg);
 701         case MMC_IOC_MULTI_CMD:
 702                 return mmc_blk_ioctl_multi_cmd(bdev,
 703                                 (struct mmc_ioc_multi_cmd __user *)arg);
 704         default:
 705                 return -EINVAL;
 706         }
 707 }
 708
 709 #ifdef CONFIG_COMPAT
 710 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 711         unsigned int cmd, unsigned long arg)
 712 {
 713         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 714 }
 715 #endif
 716
 717 static const struct block_device_operations mmc_bdops = {
 718         .open                   = mmc_blk_open,
 719         .release                = mmc_blk_release,
 720         .getgeo                 = mmc_blk_getgeo,
 721         .owner                  = THIS_MODULE,
 722         .ioctl                  = mmc_blk_ioctl,
 723 #ifdef CONFIG_COMPAT
 724         .compat_ioctl           = mmc_blk_compat_ioctl,
 725 #endif
 726 };
 727
 728 static inline int mmc_blk_part_switch(struct mmc_card *card,
 729                                       struct mmc_blk_data *md)
 730 {
 731         int ret;
 732         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 733
 734         if (main_md->part_curr == md->part_type)
 735                 return 0;
 736
 737         if (mmc_card_mmc(card)) {
 738                 u8 part_config = card->ext_csd.part_config;
 739
 740                 if (md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
 741                         mmc_retune_pause(card->host);
 742
 743                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 744                 part_config |= md->part_type;
 745
 746                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 747                                  EXT_CSD_PART_CONFIG, part_config,
 748                                  card->ext_csd.part_time);
 749                 if (ret) {
 750                         if (md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
 751                                 mmc_retune_unpause(card->host);
 752                         return ret;
 753                 }
 754
 755                 card->ext_csd.part_config = part_config;
 756
 757                 if (main_md->part_curr == EXT_CSD_PART_CONFIG_ACC_RPMB)
 758                         mmc_retune_unpause(card->host);
 759         }
 760
 761         main_md->part_curr = md->part_type;
 762         return 0;
 763 }
 764
 765 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 766 {
 767         int err;
 768         u32 result;
 769         __be32 *blocks;
 770
 771         struct mmc_request mrq = {NULL};
 772         struct mmc_command cmd = {0};
 773         struct mmc_data data = {0};
 774
 775         struct scatterlist sg;
 776
 777         cmd.opcode = MMC_APP_CMD;
 778         cmd.arg = card->rca << 16;
 779         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 780
 781         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 782         if (err)
 783                 return (u32)-1;
 784         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 785                 return (u32)-1;
 786
 787         memset(&cmd, 0, sizeof(struct mmc_command));
 788
 789         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 790         cmd.arg = 0;
 791         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 792
 793         data.blksz = 4;
 794         data.blocks = 1;
 795         data.flags = MMC_DATA_READ;
 796         data.sg = &sg;
 797         data.sg_len = 1;
 798         mmc_set_data_timeout(&data, card);
 799
 800         mrq.cmd = &cmd;
 801         mrq.data = &data;
 802
 803         blocks = kmalloc(4, GFP_KERNEL);
 804         if (!blocks)
 805                 return (u32)-1;
 806
 807         sg_init_one(&sg, blocks, 4);
 808
 809         mmc_wait_for_req(card->host, &mrq);
 810
 811         result = ntohl(*blocks);
 812         kfree(blocks);
 813
 814         if (cmd.error || data.error)
 815                 result = (u32)-1;
 816
 817         return result;
 818 }
 819
 820 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
 821 {
 822         struct mmc_command cmd = {0};
 823         int err;
 824
 825         cmd.opcode = MMC_SEND_STATUS;
 826         if (!mmc_host_is_spi(card->host))
 827                 cmd.arg = card->rca << 16;
 828         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 829         err = mmc_wait_for_cmd(card->host, &cmd, retries);
 830         if (err == 0)
 831                 *status = cmd.resp[0];
 832         return err;
 833 }
 834
 835 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 836                 bool hw_busy_detect, struct request *req, bool *gen_err)
 837 {
 838         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 839         int err = 0;
 840         u32 status;
 841
 842         do {
 843                 err = get_card_status(card, &status, 5);
 844                 if (err) {
 845                         pr_err("%s: error %d requesting status\n",
 846                                req->rq_disk->disk_name, err);
 847                         return err;
 848                 }
 849
 850                 if (status & R1_ERROR) {
 851                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 852                                 req->rq_disk->disk_name, __func__, status);
 853                         *gen_err = true;
 854                 }
 855
 856                 /* We may rely on the host hw to handle busy detection.*/
 857                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 858                         hw_busy_detect)
 859                         break;
 860
 861                 /*
 862                  * Timeout if the device never becomes ready for data and never
 863                  * leaves the program state.
 864                  */
 865                 if (time_after(jiffies, timeout)) {
 866                         pr_err("%s: Card stuck in programming state! %s %s\n",
 867                                 mmc_hostname(card->host),
 868                                 req->rq_disk->disk_name, __func__);
 869                         return -ETIMEDOUT;
 870                 }
 871
 872                 /*
 873                  * Some cards mishandle the status bits,
 874                  * so make sure to check both the busy
 875                  * indication and the card state.
 876                  */
 877         } while (!(status & R1_READY_FOR_DATA) ||
 878                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 879
 880         return err;
 881 }
 882
 883 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 884                 struct request *req, bool *gen_err, u32 *stop_status)
 885 {
 886         struct mmc_host *host = card->host;
 887         struct mmc_command cmd = {0};
 888         int err;
 889         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 890
 891         /*
 892          * Normally we use R1B responses for WRITE, but in cases where the host
 893          * has specified a max_busy_timeout we need to validate it. A failure
 894          * means we need to prevent the host from doing hw busy detection, which
 895          * is done by converting to a R1 response instead.
 896          */
 897         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 898                 use_r1b_resp = false;
 899
 900         cmd.opcode = MMC_STOP_TRANSMISSION;
 901         if (use_r1b_resp) {
 902                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 903                 cmd.busy_timeout = timeout_ms;
 904         } else {
 905                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 906         }
 907
 908         err = mmc_wait_for_cmd(host, &cmd, 5);
 909         if (err)
 910                 return err;
 911
 912         *stop_status = cmd.resp[0];
 913
 914         /* No need to check card status in case of READ. */
 915         if (rq_data_dir(req) == READ)
 916                 return 0;
 917
 918         if (!mmc_host_is_spi(host) &&
 919                 (*stop_status & R1_ERROR)) {
 920                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 921                         req->rq_disk->disk_name, __func__, *stop_status);
 922                 *gen_err = true;
 923         }
 924
 925         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 926 }
 927
 928 #define ERR_NOMEDIUM    3
 929 #define ERR_RETRY       2
 930 #define ERR_ABORT       1
 931 #define ERR_CONTINUE    0
 932
 933 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 934         bool status_valid, u32 status)
 935 {
 936         switch (error) {
 937         case -EILSEQ:
 938                 /* response crc error, retry the r/w cmd */
 939                 pr_err("%s: %s sending %s command, card status %#x\n",
 940                         req->rq_disk->disk_name, "response CRC error",
 941                         name, status);
 942                 return ERR_RETRY;
 943
 944         case -ETIMEDOUT:
 945                 pr_err("%s: %s sending %s command, card status %#x\n",
 946                         req->rq_disk->disk_name, "timed out", name, status);
 947
 948                 /* If the status cmd initially failed, retry the r/w cmd */
 949                 if (!status_valid) {
 950                         pr_err("%s: status not valid, retrying timeout\n",
 951                                 req->rq_disk->disk_name);
 952                         return ERR_RETRY;
 953                 }
 954
 955                 /*
 956                  * If it was a r/w cmd crc error, or illegal command
 957                  * (eg, issued in wrong state) then retry - we should
 958                  * have corrected the state problem above.
 959                  */
 960                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
 961                         pr_err("%s: command error, retrying timeout\n",
 962                                 req->rq_disk->disk_name);
 963                         return ERR_RETRY;
 964                 }
 965
 966                 /* Otherwise abort the command */
 967                 return ERR_ABORT;
 968
 969         default:
 970                 /* We don't understand the error code the driver gave us */
 971                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 972                        req->rq_disk->disk_name, error, status);
 973                 return ERR_ABORT;
 974         }
 975 }
 976
 977 /*
 978  * Initial r/w and stop cmd error recovery.
 979  * We don't know whether the card received the r/w cmd or not, so try to
 980  * restore things back to a sane state.  Essentially, we do this as follows:
 981  * - Obtain card status.  If the first attempt to obtain card status fails,
 982  *   the status word will reflect the failed status cmd, not the failed
 983  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
 984  *   longer communicate with the card.
 985  * - Check the card state.  If the card received the cmd but there was a
 986  *   transient problem with the response, it might still be in a data transfer
 987  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
 988  * - If the r/w cmd failed due to a response CRC error, it was probably
 989  *   transient, so retry the cmd.
 990  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
 991  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
 992  *   illegal cmd, retry.
 993  * Otherwise we don't understand what happened, so abort.
 994  */
 995 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
 996         struct mmc_blk_request *brq, bool *ecc_err, bool *gen_err)
 997 {
 998         bool prev_cmd_status_valid = true;
 999         u32 status, stop_status = 0;
1000         int err, retry;
1001
1002         if (mmc_card_removed(card))
1003                 return ERR_NOMEDIUM;
1004
1005         /*
1006          * Try to get card status which indicates both the card state
1007          * and why there was no response.  If the first attempt fails,
1008          * we can't be sure the returned status is for the r/w command.
1009          */
1010         for (retry = 2; retry >= 0; retry--) {
1011                 err = get_card_status(card, &status, 0);
1012                 if (!err)
1013                         break;
1014
1015                 /* Re-tune if needed */
1016                 mmc_retune_recheck(card->host);
1017
1018                 prev_cmd_status_valid = false;
1019                 pr_err("%s: error %d sending status command, %sing\n",
1020                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1021         }
1022
1023         /* We couldn't get a response from the card.  Give up. */
1024         if (err) {
1025                 /* Check if the card is removed */
1026                 if (mmc_detect_card_removed(card->host))
1027                         return ERR_NOMEDIUM;
1028                 return ERR_ABORT;
1029         }
1030
1031         /* Flag ECC errors */
1032         if ((status & R1_CARD_ECC_FAILED) ||
1033             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1034             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1035                 *ecc_err = true;
1036
1037         /* Flag General errors */
1038         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1039                 if ((status & R1_ERROR) ||
1040                         (brq->stop.resp[0] & R1_ERROR)) {
1041                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1042                                req->rq_disk->disk_name, __func__,
1043                                brq->stop.resp[0], status);
1044                         *gen_err = true;
1045                 }
1046
1047         /*
1048          * Check the current card state.  If it is in some data transfer
1049          * mode, tell it to stop (and hopefully transition back to TRAN.)
1050          */
1051         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1052             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1053                 err = send_stop(card,
1054                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1055                         req, gen_err, &stop_status);
1056                 if (err) {
1057                         pr_err("%s: error %d sending stop command\n",
1058                                req->rq_disk->disk_name, err);
1059                         /*
1060                          * If the stop cmd also timed out, the card is probably
1061                          * not present, so abort. Other errors are bad news too.
1062                          */
1063                         return ERR_ABORT;
1064                 }
1065
1066                 if (stop_status & R1_CARD_ECC_FAILED)
1067                         *ecc_err = true;
1068         }
1069
1070         /* Check for set block count errors */
1071         if (brq->sbc.error)
1072                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1073                                 prev_cmd_status_valid, status);
1074
1075         /* Check for r/w command errors */
1076         if (brq->cmd.error)
1077                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1078                                 prev_cmd_status_valid, status);
1079
1080         /* Data errors */
1081         if (!brq->stop.error)
1082                 return ERR_CONTINUE;
1083
1084         /* Now for stop errors.  These aren't fatal to the transfer. */
1085         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1086                req->rq_disk->disk_name, brq->stop.error,
1087                brq->cmd.resp[0], status);
1088
1089         /*
1090          * Subsitute in our own stop status as this will give the error
1091          * state which happened during the execution of the r/w command.
1092          */
1093         if (stop_status) {
1094                 brq->stop.resp[0] = stop_status;
1095                 brq->stop.error = 0;
1096         }
1097         return ERR_CONTINUE;
1098 }
1099
1100 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1101                          int type)
1102 {
1103         int err;
1104
1105         if (md->reset_done & type)
1106                 return -EEXIST;
1107
1108         md->reset_done |= type;
1109         err = mmc_hw_reset(host);
1110         /* Ensure we switch back to the correct partition */
1111         if (err != -EOPNOTSUPP) {
1112                 struct mmc_blk_data *main_md =
1113                         dev_get_drvdata(&host->card->dev);
1114                 int part_err;
1115
1116                 main_md->part_curr = main_md->part_type;
1117                 part_err = mmc_blk_part_switch(host->card, md);
1118                 if (part_err) {
1119                         /*
1120                          * We have failed to get back into the correct
1121                          * partition, so we need to abort the whole request.
1122                          */
1123                         return -ENODEV;
1124                 }
1125         }
1126         return err;
1127 }
1128
1129 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1130 {
1131         md->reset_done &= ~type;
1132 }
1133
1134 int mmc_access_rpmb(struct mmc_queue *mq)
1135 {
1136         struct mmc_blk_data *md = mq->blkdata;
1137         /*
1138          * If this is a RPMB partition access, return ture
1139          */
1140         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1141                 return true;
1142
1143         return false;
1144 }
1145
1146 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1147 {
1148         struct mmc_blk_data *md = mq->blkdata;
1149         struct mmc_card *card = md->queue.card;
1150         unsigned int from, nr, arg;
1151         int err = 0, type = MMC_BLK_DISCARD;
1152
1153         if (!mmc_can_erase(card)) {
1154                 err = -EOPNOTSUPP;
1155                 goto out;
1156         }
1157
1158         from = blk_rq_pos(req);
1159         nr = blk_rq_sectors(req);
1160
1161         if (mmc_can_discard(card))
1162                 arg = MMC_DISCARD_ARG;
1163         else if (mmc_can_trim(card))
1164                 arg = MMC_TRIM_ARG;
1165         else
1166                 arg = MMC_ERASE_ARG;
1167 retry:
1168         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1169                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1170                                  INAND_CMD38_ARG_EXT_CSD,
1171                                  arg == MMC_TRIM_ARG ?
1172                                  INAND_CMD38_ARG_TRIM :
1173                                  INAND_CMD38_ARG_ERASE,
1174                                  0);
1175                 if (err)
1176                         goto out;
1177         }
1178         err = mmc_erase(card, from, nr, arg);
1179 out:
1180         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
1181                 goto retry;
1182         if (!err)
1183                 mmc_blk_reset_success(md, type);
1184         blk_end_request(req, err, blk_rq_bytes(req));
1185
1186         return err ? 0 : 1;
1187 }
1188
1189 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1190                                        struct request *req)
1191 {
1192         struct mmc_blk_data *md = mq->blkdata;
1193         struct mmc_card *card = md->queue.card;
1194         unsigned int from, nr, arg;
1195         int err = 0, type = MMC_BLK_SECDISCARD;
1196
1197         if (!(mmc_can_secure_erase_trim(card))) {
1198                 err = -EOPNOTSUPP;
1199                 goto out;
1200         }
1201
1202         from = blk_rq_pos(req);
1203         nr = blk_rq_sectors(req);
1204
1205         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1206                 arg = MMC_SECURE_TRIM1_ARG;
1207         else
1208                 arg = MMC_SECURE_ERASE_ARG;
1209
1210 retry:
1211         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1212                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1213                                  INAND_CMD38_ARG_EXT_CSD,
1214                                  arg == MMC_SECURE_TRIM1_ARG ?
1215                                  INAND_CMD38_ARG_SECTRIM1 :
1216                                  INAND_CMD38_ARG_SECERASE,
1217                                  0);
1218                 if (err)
1219                         goto out_retry;
1220         }
1221
1222         err = mmc_erase(card, from, nr, arg);
1223         if (err == -EIO)
1224                 goto out_retry;
1225         if (err)
1226                 goto out;
1227
1228         if (arg == MMC_SECURE_TRIM1_ARG) {
1229                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1230                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1231                                          INAND_CMD38_ARG_EXT_CSD,
1232                                          INAND_CMD38_ARG_SECTRIM2,
1233                                          0);
1234                         if (err)
1235                                 goto out_retry;
1236                 }
1237
1238                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1239                 if (err == -EIO)
1240                         goto out_retry;
1241                 if (err)
1242                         goto out;
1243         }
1244
1245 out_retry:
1246         if (err && !mmc_blk_reset(md, card->host, type))
1247                 goto retry;
1248         if (!err)
1249                 mmc_blk_reset_success(md, type);
1250 out:
1251         blk_end_request(req, err, blk_rq_bytes(req));
1252
1253         return err ? 0 : 1;
1254 }
1255
1256 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1257 {
1258         struct mmc_blk_data *md = mq->blkdata;
1259         struct mmc_card *card = md->queue.card;
1260         int ret = 0;
1261
1262         ret = mmc_flush_cache(card);
1263         if (ret)
1264                 ret = -EIO;
1265
1266         blk_end_request_all(req, ret);
1267
1268         return ret ? 0 : 1;
1269 }
1270
1271 /*
1272  * Reformat current write as a reliable write, supporting
1273  * both legacy and the enhanced reliable write MMC cards.
1274  * In each transfer we'll handle only as much as a single
1275  * reliable write can handle, thus finish the request in
1276  * partial completions.
1277  */
1278 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1279                                     struct mmc_card *card,
1280                                     struct request *req)
1281 {
1282         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1283                 /* Legacy mode imposes restrictions on transfers. */
1284                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1285                         brq->data.blocks = 1;
1286
1287                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1288                         brq->data.blocks = card->ext_csd.rel_sectors;
1289                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1290                         brq->data.blocks = 1;
1291         }
1292 }
1293
1294 #define CMD_ERRORS                                                      \
1295         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1296          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1297          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1298          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1299          R1_CC_ERROR |          /* Card controller error */             \
1300          R1_ERROR)              /* General/unknown error */
1301
1302 static enum mmc_blk_status mmc_blk_err_check(struct mmc_card *card,
1303                                              struct mmc_async_req *areq)
1304 {
1305         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1306                                                     mmc_active);
1307         struct mmc_blk_request *brq = &mq_mrq->brq;
1308         struct request *req = mq_mrq->req;
1309         int need_retune = card->host->need_retune;
1310         bool ecc_err = false;
1311         bool gen_err = false;
1312
1313         /*
1314          * sbc.error indicates a problem with the set block count
1315          * command.  No data will have been transferred.
1316          *
1317          * cmd.error indicates a problem with the r/w command.  No
1318          * data will have been transferred.
1319          *
1320          * stop.error indicates a problem with the stop command.  Data
1321          * may have been transferred, or may still be transferring.
1322          */
1323         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1324             brq->data.error) {
1325                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1326                 case ERR_RETRY:
1327                         return MMC_BLK_RETRY;
1328                 case ERR_ABORT:
1329                         return MMC_BLK_ABORT;
1330                 case ERR_NOMEDIUM:
1331                         return MMC_BLK_NOMEDIUM;
1332                 case ERR_CONTINUE:
1333                         break;
1334                 }
1335         }
1336
1337         /*
1338          * Check for errors relating to the execution of the
1339          * initial command - such as address errors.  No data
1340          * has been transferred.
1341          */
1342         if (brq->cmd.resp[0] & CMD_ERRORS) {
1343                 pr_err("%s: r/w command failed, status = %#x\n",
1344                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1345                 return MMC_BLK_ABORT;
1346         }
1347
1348         /*
1349          * Everything else is either success, or a data error of some
1350          * kind.  If it was a write, we may have transitioned to
1351          * program mode, which we have to wait for it to complete.
1352          */
1353         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1354                 int err;
1355
1356                 /* Check stop command response */
1357                 if (brq->stop.resp[0] & R1_ERROR) {
1358                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1359                                req->rq_disk->disk_name, __func__,
1360                                brq->stop.resp[0]);
1361                         gen_err = true;
1362                 }
1363
1364                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1365                                         &gen_err);
1366                 if (err)
1367                         return MMC_BLK_CMD_ERR;
1368         }
1369
1370         /* if general error occurs, retry the write operation. */
1371         if (gen_err) {
1372                 pr_warn("%s: retrying write for general error\n",
1373                                 req->rq_disk->disk_name);
1374                 return MMC_BLK_RETRY;
1375         }
1376
1377         if (brq->data.error) {
1378                 if (need_retune && !brq->retune_retry_done) {
1379                         pr_debug("%s: retrying because a re-tune was needed\n",
1380                                  req->rq_disk->disk_name);
1381                         brq->retune_retry_done = 1;
1382                         return MMC_BLK_RETRY;
1383                 }
1384                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1385                        req->rq_disk->disk_name, brq->data.error,
1386                        (unsigned)blk_rq_pos(req),
1387                        (unsigned)blk_rq_sectors(req),
1388                        brq->cmd.resp[0], brq->stop.resp[0]);
1389
1390                 if (rq_data_dir(req) == READ) {
1391                         if (ecc_err)
1392                                 return MMC_BLK_ECC_ERR;
1393                         return MMC_BLK_DATA_ERR;
1394                 } else {
1395                         return MMC_BLK_CMD_ERR;
1396                 }
1397         }
1398
1399         if (!brq->data.bytes_xfered)
1400                 return MMC_BLK_RETRY;
1401
1402         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1403                 return MMC_BLK_PARTIAL;
1404
1405         return MMC_BLK_SUCCESS;
1406 }
1407
1408 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1409                                struct mmc_card *card,
1410                                int disable_multi,
1411                                struct mmc_queue *mq)
1412 {
1413         u32 readcmd, writecmd;
1414         struct mmc_blk_request *brq = &mqrq->brq;
1415         struct request *req = mqrq->req;
1416         struct mmc_blk_data *md = mq->blkdata;
1417         bool do_data_tag;
1418
1419         /*
1420          * Reliable writes are used to implement Forced Unit Access and
1421          * are supported only on MMCs.
1422          */
1423         bool do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1424                 (rq_data_dir(req) == WRITE) &&
1425                 (md->flags & MMC_BLK_REL_WR);
1426
1427         memset(brq, 0, sizeof(struct mmc_blk_request));
1428         brq->mrq.cmd = &brq->cmd;
1429         brq->mrq.data = &brq->data;
1430
1431         brq->cmd.arg = blk_rq_pos(req);
1432         if (!mmc_card_blockaddr(card))
1433                 brq->cmd.arg <<= 9;
1434         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1435         brq->data.blksz = 512;
1436         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1437         brq->stop.arg = 0;
1438         brq->data.blocks = blk_rq_sectors(req);
1439
1440         /*
1441          * The block layer doesn't support all sector count
1442          * restrictions, so we need to be prepared for too big
1443          * requests.
1444          */
1445         if (brq->data.blocks > card->host->max_blk_count)
1446                 brq->data.blocks = card->host->max_blk_count;
1447
1448         if (brq->data.blocks > 1) {
1449                 /*
1450                  * After a read error, we redo the request one sector
1451                  * at a time in order to accurately determine which
1452                  * sectors can be read successfully.
1453                  */
1454                 if (disable_multi)
1455                         brq->data.blocks = 1;
1456
1457                 /*
1458                  * Some controllers have HW issues while operating
1459                  * in multiple I/O mode
1460                  */
1461                 if (card->host->ops->multi_io_quirk)
1462                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1463                                                 (rq_data_dir(req) == READ) ?
1464                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1465                                                 brq->data.blocks);
1466         }
1467
1468         if (brq->data.blocks > 1 || do_rel_wr) {
1469                 /* SPI multiblock writes terminate using a special
1470                  * token, not a STOP_TRANSMISSION request.
1471                  */
1472                 if (!mmc_host_is_spi(card->host) ||
1473                     rq_data_dir(req) == READ)
1474                         brq->mrq.stop = &brq->stop;
1475                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1476                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1477         } else {
1478                 brq->mrq.stop = NULL;
1479                 readcmd = MMC_READ_SINGLE_BLOCK;
1480                 writecmd = MMC_WRITE_BLOCK;
1481         }
1482         if (rq_data_dir(req) == READ) {
1483                 brq->cmd.opcode = readcmd;
1484                 brq->data.flags = MMC_DATA_READ;
1485                 if (brq->mrq.stop)
1486                         brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 |
1487                                         MMC_CMD_AC;
1488         } else {
1489                 brq->cmd.opcode = writecmd;
1490                 brq->data.flags = MMC_DATA_WRITE;
1491                 if (brq->mrq.stop)
1492                         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B |
1493                                         MMC_CMD_AC;
1494         }
1495
1496         if (do_rel_wr)
1497                 mmc_apply_rel_rw(brq, card, req);
1498
1499         /*
1500          * Data tag is used only during writing meta data to speed
1501          * up write and any subsequent read of this meta data
1502          */
1503         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1504                 (req->cmd_flags & REQ_META) &&
1505                 (rq_data_dir(req) == WRITE) &&
1506                 ((brq->data.blocks * brq->data.blksz) >=
1507                  card->ext_csd.data_tag_unit_size);
1508
1509         /*
1510          * Pre-defined multi-block transfers are preferable to
1511          * open ended-ones (and necessary for reliable writes).
1512          * However, it is not sufficient to just send CMD23,
1513          * and avoid the final CMD12, as on an error condition
1514          * CMD12 (stop) needs to be sent anyway. This, coupled
1515          * with Auto-CMD23 enhancements provided by some
1516          * hosts, means that the complexity of dealing
1517          * with this is best left to the host. If CMD23 is
1518          * supported by card and host, we'll fill sbc in and let
1519          * the host deal with handling it correctly. This means
1520          * that for hosts that don't expose MMC_CAP_CMD23, no
1521          * change of behavior will be observed.
1522          *
1523          * N.B: Some MMC cards experience perf degradation.
1524          * We'll avoid using CMD23-bounded multiblock writes for
1525          * these, while retaining features like reliable writes.
1526          */
1527         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1528             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1529              do_data_tag)) {
1530                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1531                 brq->sbc.arg = brq->data.blocks |
1532                         (do_rel_wr ? (1 << 31) : 0) |
1533                         (do_data_tag ? (1 << 29) : 0);
1534                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1535                 brq->mrq.sbc = &brq->sbc;
1536         }
1537
1538         mmc_set_data_timeout(&brq->data, card);
1539
1540         brq->data.sg = mqrq->sg;
1541         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1542
1543         /*
1544          * Adjust the sg list so it is the same size as the
1545          * request.
1546          */
1547         if (brq->data.blocks != blk_rq_sectors(req)) {
1548                 int i, data_size = brq->data.blocks << 9;
1549                 struct scatterlist *sg;
1550
1551                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1552                         data_size -= sg->length;
1553                         if (data_size <= 0) {
1554                                 sg->length += data_size;
1555                                 i++;
1556                                 break;
1557                         }
1558                 }
1559                 brq->data.sg_len = i;
1560         }
1561
1562         mqrq->mmc_active.mrq = &brq->mrq;
1563         mqrq->mmc_active.err_check = mmc_blk_err_check;
1564
1565         mmc_queue_bounce_pre(mqrq);
1566 }
1567
1568 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1569                            struct mmc_blk_request *brq, struct request *req,
1570                            int ret)
1571 {
1572         struct mmc_queue_req *mq_rq;
1573         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1574
1575         /*
1576          * If this is an SD card and we're writing, we can first
1577          * mark the known good sectors as ok.
1578          *
1579          * If the card is not SD, we can still ok written sectors
1580          * as reported by the controller (which might be less than
1581          * the real number of written sectors, but never more).
1582          */
1583         if (mmc_card_sd(card)) {
1584                 u32 blocks;
1585
1586                 blocks = mmc_sd_num_wr_blocks(card);
1587                 if (blocks != (u32)-1) {
1588                         ret = blk_end_request(req, 0, blocks << 9);
1589                 }
1590         } else {
1591                 ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1592         }
1593         return ret;
1594 }
1595
1596 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1597 {
1598         struct mmc_blk_data *md = mq->blkdata;
1599         struct mmc_card *card = md->queue.card;
1600         struct mmc_blk_request *brq;
1601         int ret = 1, disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1602         enum mmc_blk_status status;
1603         struct mmc_queue_req *mq_rq;
1604         struct request *req;
1605         struct mmc_async_req *areq;
1606
1607         if (!rqc && !mq->mqrq_prev->req)
1608                 return 0;
1609
1610         do {
1611                 if (rqc) {
1612                         /*
1613                          * When 4KB native sector is enabled, only 8 blocks
1614                          * multiple read or write is allowed
1615                          */
1616                         if (mmc_large_sector(card) &&
1617                                 !IS_ALIGNED(blk_rq_sectors(rqc), 8)) {
1618                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1619                                         rqc->rq_disk->disk_name);
1620                                 mq_rq = mq->mqrq_cur;
1621                                 req = rqc;
1622                                 rqc = NULL;
1623                                 goto cmd_abort;
1624                         }
1625
1626                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1627                         areq = &mq->mqrq_cur->mmc_active;
1628                 } else
1629                         areq = NULL;
1630                 areq = mmc_start_req(card->host, areq, &status);
1631                 if (!areq) {
1632                         if (status == MMC_BLK_NEW_REQUEST)
1633                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1634                         return 0;
1635                 }
1636
1637                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1638                 brq = &mq_rq->brq;
1639                 req = mq_rq->req;
1640                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1641                 mmc_queue_bounce_post(mq_rq);
1642
1643                 switch (status) {
1644                 case MMC_BLK_SUCCESS:
1645                 case MMC_BLK_PARTIAL:
1646                         /*
1647                          * A block was successfully transferred.
1648                          */
1649                         mmc_blk_reset_success(md, type);
1650
1651                         ret = blk_end_request(req, 0,
1652                                         brq->data.bytes_xfered);
1653
1654                         /*
1655                          * If the blk_end_request function returns non-zero even
1656                          * though all data has been transferred and no errors
1657                          * were returned by the host controller, it's a bug.
1658                          */
1659                         if (status == MMC_BLK_SUCCESS && ret) {
1660                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1661                                        __func__, blk_rq_bytes(req),
1662                                        brq->data.bytes_xfered);
1663                                 rqc = NULL;
1664                                 goto cmd_abort;
1665                         }
1666                         break;
1667                 case MMC_BLK_CMD_ERR:
1668                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1669                         if (mmc_blk_reset(md, card->host, type))
1670                                 goto cmd_abort;
1671                         if (!ret)
1672                                 goto start_new_req;
1673                         break;
1674                 case MMC_BLK_RETRY:
1675                         retune_retry_done = brq->retune_retry_done;
1676                         if (retry++ < 5)
1677                                 break;
1678                         /* Fall through */
1679                 case MMC_BLK_ABORT:
1680                         if (!mmc_blk_reset(md, card->host, type))
1681                                 break;
1682                         goto cmd_abort;
1683                 case MMC_BLK_DATA_ERR: {
1684                         int err;
1685
1686                         err = mmc_blk_reset(md, card->host, type);
1687                         if (!err)
1688                                 break;
1689                         if (err == -ENODEV)
1690                                 goto cmd_abort;
1691                         /* Fall through */
1692                 }
1693                 case MMC_BLK_ECC_ERR:
1694                         if (brq->data.blocks > 1) {
1695                                 /* Redo read one sector at a time */
1696                                 pr_warn("%s: retrying using single block read\n",
1697                                         req->rq_disk->disk_name);
1698                                 disable_multi = 1;
1699                                 break;
1700                         }
1701                         /*
1702                          * After an error, we redo I/O one sector at a
1703                          * time, so we only reach here after trying to
1704                          * read a single sector.
1705                          */
1706                         ret = blk_end_request(req, -EIO,
1707                                                 brq->data.blksz);
1708                         if (!ret)
1709                                 goto start_new_req;
1710                         break;
1711                 case MMC_BLK_NOMEDIUM:
1712                         goto cmd_abort;
1713                 default:
1714                         pr_err("%s: Unhandled return value (%d)",
1715                                         req->rq_disk->disk_name, status);
1716                         goto cmd_abort;
1717                 }
1718
1719                 if (ret) {
1720                         /*
1721                          * In case of a incomplete request
1722                          * prepare it again and resend.
1723                          */
1724                         mmc_blk_rw_rq_prep(mq_rq, card,
1725                                         disable_multi, mq);
1726                         mmc_start_req(card->host,
1727                                         &mq_rq->mmc_active, NULL);
1728                         mq_rq->brq.retune_retry_done = retune_retry_done;
1729                 }
1730         } while (ret);
1731
1732         return 1;
1733
1734  cmd_abort:
1735         if (mmc_card_removed(card))
1736                 req->rq_flags |= RQF_QUIET;
1737         while (ret)
1738                 ret = blk_end_request(req, -EIO,
1739                                 blk_rq_cur_bytes(req));
1740
1741  start_new_req:
1742         if (rqc) {
1743                 if (mmc_card_removed(card)) {
1744                         rqc->rq_flags |= RQF_QUIET;
1745                         blk_end_request_all(rqc, -EIO);
1746                 } else {
1747                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1748                         mmc_start_req(card->host,
1749                                       &mq->mqrq_cur->mmc_active, NULL);
1750                 }
1751         }
1752
1753         return 0;
1754 }
1755
1756 int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1757 {
1758         int ret;
1759         struct mmc_blk_data *md = mq->blkdata;
1760         struct mmc_card *card = md->queue.card;
1761         bool req_is_special = mmc_req_is_special(req);
1762
1763         if (req && !mq->mqrq_prev->req)
1764                 /* claim host only for the first request */
1765                 mmc_get_card(card);
1766
1767         ret = mmc_blk_part_switch(card, md);
1768         if (ret) {
1769                 if (req) {
1770                         blk_end_request_all(req, -EIO);
1771                 }
1772                 ret = 0;
1773                 goto out;
1774         }
1775
1776         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
1777         if (req && req_op(req) == REQ_OP_DISCARD) {
1778                 /* complete ongoing async transfer before issuing discard */
1779                 if (card->host->areq)
1780                         mmc_blk_issue_rw_rq(mq, NULL);
1781                 ret = mmc_blk_issue_discard_rq(mq, req);
1782         } else if (req && req_op(req) == REQ_OP_SECURE_ERASE) {
1783                 /* complete ongoing async transfer before issuing secure erase*/
1784                 if (card->host->areq)
1785                         mmc_blk_issue_rw_rq(mq, NULL);
1786                 ret = mmc_blk_issue_secdiscard_rq(mq, req);
1787         } else if (req && req_op(req) == REQ_OP_FLUSH) {
1788                 /* complete ongoing async transfer before issuing flush */
1789                 if (card->host->areq)
1790                         mmc_blk_issue_rw_rq(mq, NULL);
1791                 ret = mmc_blk_issue_flush(mq, req);
1792         } else {
1793                 ret = mmc_blk_issue_rw_rq(mq, req);
1794         }
1795
1796 out:
1797         if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) || req_is_special)
1798                 /*
1799                  * Release host when there are no more requests
1800                  * and after special request(discard, flush) is done.
1801                  * In case sepecial request, there is no reentry to
1802                  * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
1803                  */
1804                 mmc_put_card(card);
1805         return ret;
1806 }
1807
1808 static inline int mmc_blk_readonly(struct mmc_card *card)
1809 {
1810         return mmc_card_readonly(card) ||
1811                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
1812 }
1813
1814 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
1815                                               struct device *parent,
1816                                               sector_t size,
1817                                               bool default_ro,
1818                                               const char *subname,
1819                                               int area_type)
1820 {
1821         struct mmc_blk_data *md;
1822         int devidx, ret;
1823
1824 again:
1825         if (!ida_pre_get(&mmc_blk_ida, GFP_KERNEL))
1826                 return ERR_PTR(-ENOMEM);
1827
1828         spin_lock(&mmc_blk_lock);
1829         ret = ida_get_new(&mmc_blk_ida, &devidx);
1830         spin_unlock(&mmc_blk_lock);
1831
1832         if (ret == -EAGAIN)
1833                 goto again;
1834         else if (ret)
1835                 return ERR_PTR(ret);
1836
1837         if (devidx >= max_devices) {
1838                 ret = -ENOSPC;
1839                 goto out;
1840         }
1841
1842         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
1843         if (!md) {
1844                 ret = -ENOMEM;
1845                 goto out;
1846         }
1847
1848         md->area_type = area_type;
1849
1850         /*
1851          * Set the read-only status based on the supported commands
1852          * and the write protect switch.
1853          */
1854         md->read_only = mmc_blk_readonly(card);
1855
1856         md->disk = alloc_disk(perdev_minors);
1857         if (md->disk == NULL) {
1858                 ret = -ENOMEM;
1859                 goto err_kfree;
1860         }
1861
1862         spin_lock_init(&md->lock);
1863         INIT_LIST_HEAD(&md->part);
1864         md->usage = 1;
1865
1866         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
1867         if (ret)
1868                 goto err_putdisk;
1869
1870         md->queue.blkdata = md;
1871
1872         md->disk->major = MMC_BLOCK_MAJOR;
1873         md->disk->first_minor = devidx * perdev_minors;
1874         md->disk->fops = &mmc_bdops;
1875         md->disk->private_data = md;
1876         md->disk->queue = md->queue.queue;
1877         md->parent = parent;
1878         set_disk_ro(md->disk, md->read_only || default_ro);
1879         md->disk->flags = GENHD_FL_EXT_DEVT;
1880         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
1881                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
1882
1883         /*
1884          * As discussed on lkml, GENHD_FL_REMOVABLE should:
1885          *
1886          * - be set for removable media with permanent block devices
1887          * - be unset for removable block devices with permanent media
1888          *
1889          * Since MMC block devices clearly fall under the second
1890          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
1891          * should use the block device creation/destruction hotplug
1892          * messages to tell when the card is present.
1893          */
1894
1895         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
1896                  "mmcblk%u%s", card->host->index, subname ? subname : "");
1897
1898         if (mmc_card_mmc(card))
1899                 blk_queue_logical_block_size(md->queue.queue,
1900                                              card->ext_csd.data_sector_size);
1901         else
1902                 blk_queue_logical_block_size(md->queue.queue, 512);
1903
1904         set_capacity(md->disk, size);
1905
1906         if (mmc_host_cmd23(card->host)) {
1907                 if ((mmc_card_mmc(card) &&
1908                      card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
1909                     (mmc_card_sd(card) &&
1910                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
1911                         md->flags |= MMC_BLK_CMD23;
1912         }
1913
1914         if (mmc_card_mmc(card) &&
1915             md->flags & MMC_BLK_CMD23 &&
1916             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
1917              card->ext_csd.rel_sectors)) {
1918                 md->flags |= MMC_BLK_REL_WR;
1919                 blk_queue_write_cache(md->queue.queue, true, true);
1920         }
1921
1922         return md;
1923
1924  err_putdisk:
1925         put_disk(md->disk);
1926  err_kfree:
1927         kfree(md);
1928  out:
1929         spin_lock(&mmc_blk_lock);
1930         ida_remove(&mmc_blk_ida, devidx);
1931         spin_unlock(&mmc_blk_lock);
1932         return ERR_PTR(ret);
1933 }
1934
1935 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
1936 {
1937         sector_t size;
1938
1939         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
1940                 /*
1941                  * The EXT_CSD sector count is in number or 512 byte
1942                  * sectors.
1943                  */
1944                 size = card->ext_csd.sectors;
1945         } else {
1946                 /*
1947                  * The CSD capacity field is in units of read_blkbits.
1948                  * set_capacity takes units of 512 bytes.
1949                  */
1950                 size = (typeof(sector_t))card->csd.capacity
1951                         << (card->csd.read_blkbits - 9);
1952         }
1953
1954         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
1955                                         MMC_BLK_DATA_AREA_MAIN);
1956 }
1957
1958 static int mmc_blk_alloc_part(struct mmc_card *card,
1959                               struct mmc_blk_data *md,
1960                               unsigned int part_type,
1961                               sector_t size,
1962                               bool default_ro,
1963                               const char *subname,
1964                               int area_type)
1965 {
1966         char cap_str[10];
1967         struct mmc_blk_data *part_md;
1968
1969         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
1970                                     subname, area_type);
1971         if (IS_ERR(part_md))
1972                 return PTR_ERR(part_md);
1973         part_md->part_type = part_type;
1974         list_add(&part_md->part, &md->part);
1975
1976         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
1977                         cap_str, sizeof(cap_str));
1978         pr_info("%s: %s %s partition %u %s\n",
1979                part_md->disk->disk_name, mmc_card_id(card),
1980                mmc_card_name(card), part_md->part_type, cap_str);
1981         return 0;
1982 }
1983
1984 /* MMC Physical partitions consist of two boot partitions and
1985  * up to four general purpose partitions.
1986  * For each partition enabled in EXT_CSD a block device will be allocatedi
1987  * to provide access to the partition.
1988  */
1989
1990 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
1991 {
1992         int idx, ret = 0;
1993
1994         if (!mmc_card_mmc(card))
1995                 return 0;
1996
1997         for (idx = 0; idx < card->nr_parts; idx++) {
1998                 if (card->part[idx].size) {
1999                         ret = mmc_blk_alloc_part(card, md,
2000                                 card->part[idx].part_cfg,
2001                                 card->part[idx].size >> 9,
2002                                 card->part[idx].force_ro,
2003                                 card->part[idx].name,
2004                                 card->part[idx].area_type);
2005                         if (ret)
2006                                 return ret;
2007                 }
2008         }
2009
2010         return ret;
2011 }
2012
2013 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2014 {
2015         struct mmc_card *card;
2016
2017         if (md) {
2018                 /*
2019                  * Flush remaining requests and free queues. It
2020                  * is freeing the queue that stops new requests
2021                  * from being accepted.
2022                  */
2023                 card = md->queue.card;
2024                 mmc_cleanup_queue(&md->queue);
2025                 if (md->disk->flags & GENHD_FL_UP) {
2026                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2027                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2028                                         card->ext_csd.boot_ro_lockable)
2029                                 device_remove_file(disk_to_dev(md->disk),
2030                                         &md->power_ro_lock);
2031
2032                         del_gendisk(md->disk);
2033                 }
2034                 mmc_blk_put(md);
2035         }
2036 }
2037
2038 static void mmc_blk_remove_parts(struct mmc_card *card,
2039                                  struct mmc_blk_data *md)
2040 {
2041         struct list_head *pos, *q;
2042         struct mmc_blk_data *part_md;
2043
2044         list_for_each_safe(pos, q, &md->part) {
2045                 part_md = list_entry(pos, struct mmc_blk_data, part);
2046                 list_del(pos);
2047                 mmc_blk_remove_req(part_md);
2048         }
2049 }
2050
2051 static int mmc_add_disk(struct mmc_blk_data *md)
2052 {
2053         int ret;
2054         struct mmc_card *card = md->queue.card;
2055
2056         device_add_disk(md->parent, md->disk);
2057         md->force_ro.show = force_ro_show;
2058         md->force_ro.store = force_ro_store;
2059         sysfs_attr_init(&md->force_ro.attr);
2060         md->force_ro.attr.name = "force_ro";
2061         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2062         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2063         if (ret)
2064                 goto force_ro_fail;
2065
2066         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2067              card->ext_csd.boot_ro_lockable) {
2068                 umode_t mode;
2069
2070                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2071                         mode = S_IRUGO;
2072                 else
2073                         mode = S_IRUGO | S_IWUSR;
2074
2075                 md->power_ro_lock.show = power_ro_lock_show;
2076                 md->power_ro_lock.store = power_ro_lock_store;
2077                 sysfs_attr_init(&md->power_ro_lock.attr);
2078                 md->power_ro_lock.attr.mode = mode;
2079                 md->power_ro_lock.attr.name =
2080                                         "ro_lock_until_next_power_on";
2081                 ret = device_create_file(disk_to_dev(md->disk),
2082                                 &md->power_ro_lock);
2083                 if (ret)
2084                         goto power_ro_lock_fail;
2085         }
2086         return ret;
2087
2088 power_ro_lock_fail:
2089         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2090 force_ro_fail:
2091         del_gendisk(md->disk);
2092
2093         return ret;
2094 }
2095
2096 static const struct mmc_fixup blk_fixups[] =
2097 {
2098         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2099                   MMC_QUIRK_INAND_CMD38),
2100         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2101                   MMC_QUIRK_INAND_CMD38),
2102         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2103                   MMC_QUIRK_INAND_CMD38),
2104         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2105                   MMC_QUIRK_INAND_CMD38),
2106         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2107                   MMC_QUIRK_INAND_CMD38),
2108
2109         /*
2110          * Some MMC cards experience performance degradation with CMD23
2111          * instead of CMD12-bounded multiblock transfers. For now we'll
2112          * black list what's bad...
2113          * - Certain Toshiba cards.
2114          *
2115          * N.B. This doesn't affect SD cards.
2116          */
2117         MMC_FIXUP("SDMB-32", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2118                   MMC_QUIRK_BLK_NO_CMD23),
2119         MMC_FIXUP("SDM032", CID_MANFID_SANDISK, CID_OEMID_ANY, add_quirk_mmc,
2120                   MMC_QUIRK_BLK_NO_CMD23),
2121         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2122                   MMC_QUIRK_BLK_NO_CMD23),
2123         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2124                   MMC_QUIRK_BLK_NO_CMD23),
2125         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2126                   MMC_QUIRK_BLK_NO_CMD23),
2127
2128         /*
2129          * Some MMC cards need longer data read timeout than indicated in CSD.
2130          */
2131         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2132                   MMC_QUIRK_LONG_READ_TIME),
2133         MMC_FIXUP("008GE0", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2134                   MMC_QUIRK_LONG_READ_TIME),
2135
2136         /*
2137          * On these Samsung MoviNAND parts, performing secure erase or
2138          * secure trim can result in unrecoverable corruption due to a
2139          * firmware bug.
2140          */
2141         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2142                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2143         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2144                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2145         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2146                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2147         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2148                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2149         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2150                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2151         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2152                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2153         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2154                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2155         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2156                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2157
2158         /*
2159          *  On Some Kingston eMMCs, performing trim can result in
2160          *  unrecoverable data conrruption occasionally due to a firmware bug.
2161          */
2162         MMC_FIXUP("V10008", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2163                   MMC_QUIRK_TRIM_BROKEN),
2164         MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
2165                   MMC_QUIRK_TRIM_BROKEN),
2166
2167         END_FIXUP
2168 };
2169
2170 static int mmc_blk_probe(struct mmc_card *card)
2171 {
2172         struct mmc_blk_data *md, *part_md;
2173         char cap_str[10];
2174
2175         /*
2176          * Check that the card supports the command class(es) we need.
2177          */
2178         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2179                 return -ENODEV;
2180
2181         mmc_fixup_device(card, blk_fixups);
2182
2183         md = mmc_blk_alloc(card);
2184         if (IS_ERR(md))
2185                 return PTR_ERR(md);
2186
2187         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2188                         cap_str, sizeof(cap_str));
2189         pr_info("%s: %s %s %s %s\n",
2190                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2191                 cap_str, md->read_only ? "(ro)" : "");
2192
2193         if (mmc_blk_alloc_parts(card, md))
2194                 goto out;
2195
2196         dev_set_drvdata(&card->dev, md);
2197
2198         if (mmc_add_disk(md))
2199                 goto out;
2200
2201         list_for_each_entry(part_md, &md->part, part) {
2202                 if (mmc_add_disk(part_md))
2203                         goto out;
2204         }
2205
2206         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2207         pm_runtime_use_autosuspend(&card->dev);
2208
2209         /*
2210          * Don't enable runtime PM for SD-combo cards here. Leave that
2211          * decision to be taken during the SDIO init sequence instead.
2212          */
2213         if (card->type != MMC_TYPE_SD_COMBO) {
2214                 pm_runtime_set_active(&card->dev);
2215                 pm_runtime_enable(&card->dev);
2216         }
2217
2218         return 0;
2219
2220  out:
2221         mmc_blk_remove_parts(card, md);
2222         mmc_blk_remove_req(md);
2223         return 0;
2224 }
2225
2226 static void mmc_blk_remove(struct mmc_card *card)
2227 {
2228         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2229
2230         mmc_blk_remove_parts(card, md);
2231         pm_runtime_get_sync(&card->dev);
2232         mmc_claim_host(card->host);
2233         mmc_blk_part_switch(card, md);
2234         mmc_release_host(card->host);
2235         if (card->type != MMC_TYPE_SD_COMBO)
2236                 pm_runtime_disable(&card->dev);
2237         pm_runtime_put_noidle(&card->dev);
2238         mmc_blk_remove_req(md);
2239         dev_set_drvdata(&card->dev, NULL);
2240 }
2241
2242 static int _mmc_blk_suspend(struct mmc_card *card)
2243 {
2244         struct mmc_blk_data *part_md;
2245         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2246
2247         if (md) {
2248                 mmc_queue_suspend(&md->queue);
2249                 list_for_each_entry(part_md, &md->part, part) {
2250                         mmc_queue_suspend(&part_md->queue);
2251                 }
2252         }
2253         return 0;
2254 }
2255
2256 static void mmc_blk_shutdown(struct mmc_card *card)
2257 {
2258         _mmc_blk_suspend(card);
2259 }
2260
2261 #ifdef CONFIG_PM_SLEEP
2262 static int mmc_blk_suspend(struct device *dev)
2263 {
2264         struct mmc_card *card = mmc_dev_to_card(dev);
2265
2266         return _mmc_blk_suspend(card);
2267 }
2268
2269 static int mmc_blk_resume(struct device *dev)
2270 {
2271         struct mmc_blk_data *part_md;
2272         struct mmc_blk_data *md = dev_get_drvdata(dev);
2273
2274         if (md) {
2275                 /*
2276                  * Resume involves the card going into idle state,
2277                  * so current partition is always the main one.
2278                  */
2279                 md->part_curr = md->part_type;
2280                 mmc_queue_resume(&md->queue);
2281                 list_for_each_entry(part_md, &md->part, part) {
2282                         mmc_queue_resume(&part_md->queue);
2283                 }
2284         }
2285         return 0;
2286 }
2287 #endif
2288
2289 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2290
2291 static struct mmc_driver mmc_driver = {
2292         .drv            = {
2293                 .name   = "mmcblk",
2294                 .pm     = &mmc_blk_pm_ops,
2295         },
2296         .probe          = mmc_blk_probe,
2297         .remove         = mmc_blk_remove,
2298         .shutdown       = mmc_blk_shutdown,
2299 };
2300
2301 static int __init mmc_blk_init(void)
2302 {
2303         int res;
2304
2305         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2306                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2307
2308         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2309
2310         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2311         if (res)
2312                 goto out;
2313
2314         res = mmc_register_driver(&mmc_driver);
2315         if (res)
2316                 goto out2;
2317
2318         return 0;
2319  out2:
2320         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2321  out:
2322         return res;
2323 }
2324
2325 static void __exit mmc_blk_exit(void)
2326 {
2327         mmc_unregister_driver(&mmc_driver);
2328         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2329 }
2330
2331 module_init(mmc_blk_init);
2332 module_exit(mmc_blk_exit);
2333
2334 MODULE_LICENSE("GPL");
2335 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2336