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 <linux/uaccess.h>
  47
  48 #include "queue.h"
  49 #include "block.h"
  50 #include "core.h"
  51 #include "card.h"
  52 #include "host.h"
  53 #include "bus.h"
  54 #include "mmc_ops.h"
  55 #include "quirks.h"
  56 #include "sd_ops.h"
  57
  58 MODULE_ALIAS("mmc:block");
  59 #ifdef MODULE_PARAM_PREFIX
  60 #undef MODULE_PARAM_PREFIX
  61 #endif
  62 #define MODULE_PARAM_PREFIX "mmcblk."
  63
  64 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
  65 #define MMC_SANITIZE_REQ_TIMEOUT 240000
  66 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
  67
  68 #define mmc_req_rel_wr(req)     ((req->cmd_flags & REQ_FUA) && \
  69                                   (rq_data_dir(req) == WRITE))
  70 static DEFINE_MUTEX(block_mutex);
  71
  72 /*
  73  * The defaults come from config options but can be overriden by module
  74  * or bootarg options.
  75  */
  76 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  77
  78 /*
  79  * We've only got one major, so number of mmcblk devices is
  80  * limited to (1 << 20) / number of minors per device.  It is also
  81  * limited by the MAX_DEVICES below.
  82  */
  83 static int max_devices;
  84
  85 #define MAX_DEVICES 256
  86
  87 static DEFINE_IDA(mmc_blk_ida);
  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
 131 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 132 {
 133         struct mmc_blk_data *md;
 134
 135         mutex_lock(&open_lock);
 136         md = disk->private_data;
 137         if (md && md->usage == 0)
 138                 md = NULL;
 139         if (md)
 140                 md->usage++;
 141         mutex_unlock(&open_lock);
 142
 143         return md;
 144 }
 145
 146 static inline int mmc_get_devidx(struct gendisk *disk)
 147 {
 148         int devidx = disk->first_minor / perdev_minors;
 149         return devidx;
 150 }
 151
 152 static void mmc_blk_put(struct mmc_blk_data *md)
 153 {
 154         mutex_lock(&open_lock);
 155         md->usage--;
 156         if (md->usage == 0) {
 157                 int devidx = mmc_get_devidx(md->disk);
 158                 blk_cleanup_queue(md->queue.queue);
 159                 ida_simple_remove(&mmc_blk_ida, devidx);
 160                 put_disk(md->disk);
 161                 kfree(md);
 162         }
 163         mutex_unlock(&open_lock);
 164 }
 165
 166 static ssize_t power_ro_lock_show(struct device *dev,
 167                 struct device_attribute *attr, char *buf)
 168 {
 169         int ret;
 170         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 171         struct mmc_card *card = md->queue.card;
 172         int locked = 0;
 173
 174         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
 175                 locked = 2;
 176         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
 177                 locked = 1;
 178
 179         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
 180
 181         mmc_blk_put(md);
 182
 183         return ret;
 184 }
 185
 186 static ssize_t power_ro_lock_store(struct device *dev,
 187                 struct device_attribute *attr, const char *buf, size_t count)
 188 {
 189         int ret;
 190         struct mmc_blk_data *md, *part_md;
 191         struct mmc_card *card;
 192         struct mmc_queue *mq;
 193         struct request *req;
 194         unsigned long set;
 195
 196         if (kstrtoul(buf, 0, &set))
 197                 return -EINVAL;
 198
 199         if (set != 1)
 200                 return count;
 201
 202         md = mmc_blk_get(dev_to_disk(dev));
 203         mq = &md->queue;
 204         card = md->queue.card;
 205
 206         /* Dispatch locking to the block layer */
 207         req = blk_get_request(mq->queue, REQ_OP_DRV_OUT, __GFP_RECLAIM);
 208         req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_BOOT_WP;
 209         blk_execute_rq(mq->queue, NULL, req, 0);
 210         ret = req_to_mmc_queue_req(req)->drv_op_result;
 211
 212         if (!ret) {
 213                 pr_info("%s: Locking boot partition ro until next power on\n",
 214                         md->disk->disk_name);
 215                 set_disk_ro(md->disk, 1);
 216
 217                 list_for_each_entry(part_md, &md->part, part)
 218                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
 219                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
 220                                 set_disk_ro(part_md->disk, 1);
 221                         }
 222         }
 223
 224         mmc_blk_put(md);
 225         return count;
 226 }
 227
 228 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 229                              char *buf)
 230 {
 231         int ret;
 232         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 233
 234         ret = snprintf(buf, PAGE_SIZE, "%d\n",
 235                        get_disk_ro(dev_to_disk(dev)) ^
 236                        md->read_only);
 237         mmc_blk_put(md);
 238         return ret;
 239 }
 240
 241 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 242                               const char *buf, size_t count)
 243 {
 244         int ret;
 245         char *end;
 246         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 247         unsigned long set = simple_strtoul(buf, &end, 0);
 248         if (end == buf) {
 249                 ret = -EINVAL;
 250                 goto out;
 251         }
 252
 253         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 254         ret = count;
 255 out:
 256         mmc_blk_put(md);
 257         return ret;
 258 }
 259
 260 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 261 {
 262         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 263         int ret = -ENXIO;
 264
 265         mutex_lock(&block_mutex);
 266         if (md) {
 267                 if (md->usage == 2)
 268                         check_disk_change(bdev);
 269                 ret = 0;
 270
 271                 if ((mode & FMODE_WRITE) && md->read_only) {
 272                         mmc_blk_put(md);
 273                         ret = -EROFS;
 274                 }
 275         }
 276         mutex_unlock(&block_mutex);
 277
 278         return ret;
 279 }
 280
 281 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
 282 {
 283         struct mmc_blk_data *md = disk->private_data;
 284
 285         mutex_lock(&block_mutex);
 286         mmc_blk_put(md);
 287         mutex_unlock(&block_mutex);
 288 }
 289
 290 static int
 291 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 292 {
 293         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 294         geo->heads = 4;
 295         geo->sectors = 16;
 296         return 0;
 297 }
 298
 299 struct mmc_blk_ioc_data {
 300         struct mmc_ioc_cmd ic;
 301         unsigned char *buf;
 302         u64 buf_bytes;
 303 };
 304
 305 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
 306         struct mmc_ioc_cmd __user *user)
 307 {
 308         struct mmc_blk_ioc_data *idata;
 309         int err;
 310
 311         idata = kmalloc(sizeof(*idata), GFP_KERNEL);
 312         if (!idata) {
 313                 err = -ENOMEM;
 314                 goto out;
 315         }
 316
 317         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
 318                 err = -EFAULT;
 319                 goto idata_err;
 320         }
 321
 322         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
 323         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
 324                 err = -EOVERFLOW;
 325                 goto idata_err;
 326         }
 327
 328         if (!idata->buf_bytes) {
 329                 idata->buf = NULL;
 330                 return idata;
 331         }
 332
 333         idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
 334         if (!idata->buf) {
 335                 err = -ENOMEM;
 336                 goto idata_err;
 337         }
 338
 339         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
 340                                         idata->ic.data_ptr, idata->buf_bytes)) {
 341                 err = -EFAULT;
 342                 goto copy_err;
 343         }
 344
 345         return idata;
 346
 347 copy_err:
 348         kfree(idata->buf);
 349 idata_err:
 350         kfree(idata);
 351 out:
 352         return ERR_PTR(err);
 353 }
 354
 355 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
 356                                       struct mmc_blk_ioc_data *idata)
 357 {
 358         struct mmc_ioc_cmd *ic = &idata->ic;
 359
 360         if (copy_to_user(&(ic_ptr->response), ic->response,
 361                          sizeof(ic->response)))
 362                 return -EFAULT;
 363
 364         if (!idata->ic.write_flag) {
 365                 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
 366                                  idata->buf, idata->buf_bytes))
 367                         return -EFAULT;
 368         }
 369
 370         return 0;
 371 }
 372
 373 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
 374                                        u32 retries_max)
 375 {
 376         int err;
 377         u32 retry_count = 0;
 378
 379         if (!status || !retries_max)
 380                 return -EINVAL;
 381
 382         do {
 383                 err = __mmc_send_status(card, status, 5);
 384                 if (err)
 385                         break;
 386
 387                 if (!R1_STATUS(*status) &&
 388                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
 389                         break; /* RPMB programming operation complete */
 390
 391                 /*
 392                  * Rechedule to give the MMC device a chance to continue
 393                  * processing the previous command without being polled too
 394                  * frequently.
 395                  */
 396                 usleep_range(1000, 5000);
 397         } while (++retry_count < retries_max);
 398
 399         if (retry_count == retries_max)
 400                 err = -EPERM;
 401
 402         return err;
 403 }
 404
 405 static int ioctl_do_sanitize(struct mmc_card *card)
 406 {
 407         int err;
 408
 409         if (!mmc_can_sanitize(card)) {
 410                         pr_warn("%s: %s - SANITIZE is not supported\n",
 411                                 mmc_hostname(card->host), __func__);
 412                         err = -EOPNOTSUPP;
 413                         goto out;
 414         }
 415
 416         pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
 417                 mmc_hostname(card->host), __func__);
 418
 419         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 420                                         EXT_CSD_SANITIZE_START, 1,
 421                                         MMC_SANITIZE_REQ_TIMEOUT);
 422
 423         if (err)
 424                 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
 425                        mmc_hostname(card->host), __func__, err);
 426
 427         pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
 428                                              __func__);
 429 out:
 430         return err;
 431 }
 432
 433 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
 434                                struct mmc_blk_ioc_data *idata)
 435 {
 436         struct mmc_command cmd = {};
 437         struct mmc_data data = {};
 438         struct mmc_request mrq = {};
 439         struct scatterlist sg;
 440         int err;
 441         bool is_rpmb = false;
 442         u32 status = 0;
 443
 444         if (!card || !md || !idata)
 445                 return -EINVAL;
 446
 447         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
 448                 is_rpmb = true;
 449
 450         cmd.opcode = idata->ic.opcode;
 451         cmd.arg = idata->ic.arg;
 452         cmd.flags = idata->ic.flags;
 453
 454         if (idata->buf_bytes) {
 455                 data.sg = &sg;
 456                 data.sg_len = 1;
 457                 data.blksz = idata->ic.blksz;
 458                 data.blocks = idata->ic.blocks;
 459
 460                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
 461
 462                 if (idata->ic.write_flag)
 463                         data.flags = MMC_DATA_WRITE;
 464                 else
 465                         data.flags = MMC_DATA_READ;
 466
 467                 /* data.flags must already be set before doing this. */
 468                 mmc_set_data_timeout(&data, card);
 469
 470                 /* Allow overriding the timeout_ns for empirical tuning. */
 471                 if (idata->ic.data_timeout_ns)
 472                         data.timeout_ns = idata->ic.data_timeout_ns;
 473
 474                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
 475                         /*
 476                          * Pretend this is a data transfer and rely on the
 477                          * host driver to compute timeout.  When all host
 478                          * drivers support cmd.cmd_timeout for R1B, this
 479                          * can be changed to:
 480                          *
 481                          *     mrq.data = NULL;
 482                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
 483                          */
 484                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
 485                 }
 486
 487                 mrq.data = &data;
 488         }
 489
 490         mrq.cmd = &cmd;
 491
 492         err = mmc_blk_part_switch(card, md);
 493         if (err)
 494                 return err;
 495
 496         if (idata->ic.is_acmd) {
 497                 err = mmc_app_cmd(card->host, card);
 498                 if (err)
 499                         return err;
 500         }
 501
 502         if (is_rpmb) {
 503                 err = mmc_set_blockcount(card, data.blocks,
 504                         idata->ic.write_flag & (1 << 31));
 505                 if (err)
 506                         return err;
 507         }
 508
 509         if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
 510             (cmd.opcode == MMC_SWITCH)) {
 511                 err = ioctl_do_sanitize(card);
 512
 513                 if (err)
 514                         pr_err("%s: ioctl_do_sanitize() failed. err = %d",
 515                                __func__, err);
 516
 517                 return err;
 518         }
 519
 520         mmc_wait_for_req(card->host, &mrq);
 521
 522         if (cmd.error) {
 523                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
 524                                                 __func__, cmd.error);
 525                 return cmd.error;
 526         }
 527         if (data.error) {
 528                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
 529                                                 __func__, data.error);
 530                 return data.error;
 531         }
 532
 533         /*
 534          * According to the SD specs, some commands require a delay after
 535          * issuing the command.
 536          */
 537         if (idata->ic.postsleep_min_us)
 538                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
 539
 540         memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
 541
 542         if (is_rpmb) {
 543                 /*
 544                  * Ensure RPMB command has completed by polling CMD13
 545                  * "Send Status".
 546                  */
 547                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
 548                 if (err)
 549                         dev_err(mmc_dev(card->host),
 550                                         "%s: Card Status=0x%08X, error %d\n",
 551                                         __func__, status, err);
 552         }
 553
 554         return err;
 555 }
 556
 557 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 558                              struct mmc_ioc_cmd __user *ic_ptr)
 559 {
 560         struct mmc_blk_ioc_data *idata;
 561         struct mmc_blk_ioc_data *idatas[1];
 562         struct mmc_blk_data *md;
 563         struct mmc_queue *mq;
 564         struct mmc_card *card;
 565         int err = 0, ioc_err = 0;
 566         struct request *req;
 567
 568         /*
 569          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
 570          * whole block device, not on a partition.  This prevents overspray
 571          * between sibling partitions.
 572          */
 573         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
 574                 return -EPERM;
 575
 576         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
 577         if (IS_ERR(idata))
 578                 return PTR_ERR(idata);
 579
 580         md = mmc_blk_get(bdev->bd_disk);
 581         if (!md) {
 582                 err = -EINVAL;
 583                 goto cmd_err;
 584         }
 585
 586         card = md->queue.card;
 587         if (IS_ERR(card)) {
 588                 err = PTR_ERR(card);
 589                 goto cmd_done;
 590         }
 591
 592         /*
 593          * Dispatch the ioctl() into the block request queue.
 594          */
 595         mq = &md->queue;
 596         req = blk_get_request(mq->queue,
 597                 idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
 598                 __GFP_RECLAIM);
 599         idatas[0] = idata;
 600         req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_IOCTL;
 601         req_to_mmc_queue_req(req)->idata = idatas;
 602         req_to_mmc_queue_req(req)->ioc_count = 1;
 603         blk_execute_rq(mq->queue, NULL, req, 0);
 604         ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
 605         err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
 606         blk_put_request(req);
 607
 608 cmd_done:
 609         mmc_blk_put(md);
 610 cmd_err:
 611         kfree(idata->buf);
 612         kfree(idata);
 613         return ioc_err ? ioc_err : err;
 614 }
 615
 616 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 617                                    struct mmc_ioc_multi_cmd __user *user)
 618 {
 619         struct mmc_blk_ioc_data **idata = NULL;
 620         struct mmc_ioc_cmd __user *cmds = user->cmds;
 621         struct mmc_card *card;
 622         struct mmc_blk_data *md;
 623         struct mmc_queue *mq;
 624         int i, err = 0, ioc_err = 0;
 625         __u64 num_of_cmds;
 626         struct request *req;
 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)
 641                 return 0;
 642
 643         if (num_of_cmds > MMC_IOC_MAX_CMDS)
 644                 return -EINVAL;
 645
 646         idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
 647         if (!idata)
 648                 return -ENOMEM;
 649
 650         for (i = 0; i < num_of_cmds; i++) {
 651                 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
 652                 if (IS_ERR(idata[i])) {
 653                         err = PTR_ERR(idata[i]);
 654                         num_of_cmds = i;
 655                         goto cmd_err;
 656                 }
 657         }
 658
 659         md = mmc_blk_get(bdev->bd_disk);
 660         if (!md) {
 661                 err = -EINVAL;
 662                 goto cmd_err;
 663         }
 664
 665         card = md->queue.card;
 666         if (IS_ERR(card)) {
 667                 err = PTR_ERR(card);
 668                 goto cmd_done;
 669         }
 670
 671
 672         /*
 673          * Dispatch the ioctl()s into the block request queue.
 674          */
 675         mq = &md->queue;
 676         req = blk_get_request(mq->queue,
 677                 idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN,
 678                 __GFP_RECLAIM);
 679         req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_IOCTL;
 680         req_to_mmc_queue_req(req)->idata = idata;
 681         req_to_mmc_queue_req(req)->ioc_count = num_of_cmds;
 682         blk_execute_rq(mq->queue, NULL, req, 0);
 683         ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
 684
 685         /* copy to user if data and response */
 686         for (i = 0; i < num_of_cmds && !err; i++)
 687                 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
 688
 689         blk_put_request(req);
 690
 691 cmd_done:
 692         mmc_blk_put(md);
 693 cmd_err:
 694         for (i = 0; i < num_of_cmds; i++) {
 695                 kfree(idata[i]->buf);
 696                 kfree(idata[i]);
 697         }
 698         kfree(idata);
 699         return ioc_err ? ioc_err : err;
 700 }
 701
 702 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
 703         unsigned int cmd, unsigned long arg)
 704 {
 705         switch (cmd) {
 706         case MMC_IOC_CMD:
 707                 return mmc_blk_ioctl_cmd(bdev,
 708                                 (struct mmc_ioc_cmd __user *)arg);
 709         case MMC_IOC_MULTI_CMD:
 710                 return mmc_blk_ioctl_multi_cmd(bdev,
 711                                 (struct mmc_ioc_multi_cmd __user *)arg);
 712         default:
 713                 return -EINVAL;
 714         }
 715 }
 716
 717 #ifdef CONFIG_COMPAT
 718 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
 719         unsigned int cmd, unsigned long arg)
 720 {
 721         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
 722 }
 723 #endif
 724
 725 static const struct block_device_operations mmc_bdops = {
 726         .open                   = mmc_blk_open,
 727         .release                = mmc_blk_release,
 728         .getgeo                 = mmc_blk_getgeo,
 729         .owner                  = THIS_MODULE,
 730         .ioctl                  = mmc_blk_ioctl,
 731 #ifdef CONFIG_COMPAT
 732         .compat_ioctl           = mmc_blk_compat_ioctl,
 733 #endif
 734 };
 735
 736 static int mmc_blk_part_switch_pre(struct mmc_card *card,
 737                                    unsigned int part_type)
 738 {
 739         int ret = 0;
 740
 741         if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
 742                 if (card->ext_csd.cmdq_en) {
 743                         ret = mmc_cmdq_disable(card);
 744                         if (ret)
 745                                 return ret;
 746                 }
 747                 mmc_retune_pause(card->host);
 748         }
 749
 750         return ret;
 751 }
 752
 753 static int mmc_blk_part_switch_post(struct mmc_card *card,
 754                                     unsigned int part_type)
 755 {
 756         int ret = 0;
 757
 758         if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
 759                 mmc_retune_unpause(card->host);
 760                 if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
 761                         ret = mmc_cmdq_enable(card);
 762         }
 763
 764         return ret;
 765 }
 766
 767 static inline int mmc_blk_part_switch(struct mmc_card *card,
 768                                       struct mmc_blk_data *md)
 769 {
 770         int ret = 0;
 771         struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
 772
 773         if (main_md->part_curr == md->part_type)
 774                 return 0;
 775
 776         if (mmc_card_mmc(card)) {
 777                 u8 part_config = card->ext_csd.part_config;
 778
 779                 ret = mmc_blk_part_switch_pre(card, md->part_type);
 780                 if (ret)
 781                         return ret;
 782
 783                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 784                 part_config |= md->part_type;
 785
 786                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 787                                  EXT_CSD_PART_CONFIG, part_config,
 788                                  card->ext_csd.part_time);
 789                 if (ret) {
 790                         mmc_blk_part_switch_post(card, md->part_type);
 791                         return ret;
 792                 }
 793
 794                 card->ext_csd.part_config = part_config;
 795
 796                 ret = mmc_blk_part_switch_post(card, main_md->part_curr);
 797         }
 798
 799         main_md->part_curr = md->part_type;
 800         return ret;
 801 }
 802
 803 static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
 804 {
 805         int err;
 806         u32 result;
 807         __be32 *blocks;
 808
 809         struct mmc_request mrq = {};
 810         struct mmc_command cmd = {};
 811         struct mmc_data data = {};
 812
 813         struct scatterlist sg;
 814
 815         cmd.opcode = MMC_APP_CMD;
 816         cmd.arg = card->rca << 16;
 817         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 818
 819         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 820         if (err)
 821                 return err;
 822         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 823                 return -EIO;
 824
 825         memset(&cmd, 0, sizeof(struct mmc_command));
 826
 827         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 828         cmd.arg = 0;
 829         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 830
 831         data.blksz = 4;
 832         data.blocks = 1;
 833         data.flags = MMC_DATA_READ;
 834         data.sg = &sg;
 835         data.sg_len = 1;
 836         mmc_set_data_timeout(&data, card);
 837
 838         mrq.cmd = &cmd;
 839         mrq.data = &data;
 840
 841         blocks = kmalloc(4, GFP_KERNEL);
 842         if (!blocks)
 843                 return -ENOMEM;
 844
 845         sg_init_one(&sg, blocks, 4);
 846
 847         mmc_wait_for_req(card->host, &mrq);
 848
 849         result = ntohl(*blocks);
 850         kfree(blocks);
 851
 852         if (cmd.error || data.error)
 853                 return -EIO;
 854
 855         *written_blocks = result;
 856
 857         return 0;
 858 }
 859
 860 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
 861                 bool hw_busy_detect, struct request *req, bool *gen_err)
 862 {
 863         unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
 864         int err = 0;
 865         u32 status;
 866
 867         do {
 868                 err = __mmc_send_status(card, &status, 5);
 869                 if (err) {
 870                         pr_err("%s: error %d requesting status\n",
 871                                req->rq_disk->disk_name, err);
 872                         return err;
 873                 }
 874
 875                 if (status & R1_ERROR) {
 876                         pr_err("%s: %s: error sending status cmd, status %#x\n",
 877                                 req->rq_disk->disk_name, __func__, status);
 878                         *gen_err = true;
 879                 }
 880
 881                 /* We may rely on the host hw to handle busy detection.*/
 882                 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
 883                         hw_busy_detect)
 884                         break;
 885
 886                 /*
 887                  * Timeout if the device never becomes ready for data and never
 888                  * leaves the program state.
 889                  */
 890                 if (time_after(jiffies, timeout)) {
 891                         pr_err("%s: Card stuck in programming state! %s %s\n",
 892                                 mmc_hostname(card->host),
 893                                 req->rq_disk->disk_name, __func__);
 894                         return -ETIMEDOUT;
 895                 }
 896
 897                 /*
 898                  * Some cards mishandle the status bits,
 899                  * so make sure to check both the busy
 900                  * indication and the card state.
 901                  */
 902         } while (!(status & R1_READY_FOR_DATA) ||
 903                  (R1_CURRENT_STATE(status) == R1_STATE_PRG));
 904
 905         return err;
 906 }
 907
 908 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
 909                 struct request *req, bool *gen_err, u32 *stop_status)
 910 {
 911         struct mmc_host *host = card->host;
 912         struct mmc_command cmd = {};
 913         int err;
 914         bool use_r1b_resp = rq_data_dir(req) == WRITE;
 915
 916         /*
 917          * Normally we use R1B responses for WRITE, but in cases where the host
 918          * has specified a max_busy_timeout we need to validate it. A failure
 919          * means we need to prevent the host from doing hw busy detection, which
 920          * is done by converting to a R1 response instead.
 921          */
 922         if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
 923                 use_r1b_resp = false;
 924
 925         cmd.opcode = MMC_STOP_TRANSMISSION;
 926         if (use_r1b_resp) {
 927                 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 928                 cmd.busy_timeout = timeout_ms;
 929         } else {
 930                 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 931         }
 932
 933         err = mmc_wait_for_cmd(host, &cmd, 5);
 934         if (err)
 935                 return err;
 936
 937         *stop_status = cmd.resp[0];
 938
 939         /* No need to check card status in case of READ. */
 940         if (rq_data_dir(req) == READ)
 941                 return 0;
 942
 943         if (!mmc_host_is_spi(host) &&
 944                 (*stop_status & R1_ERROR)) {
 945                 pr_err("%s: %s: general error sending stop command, resp %#x\n",
 946                         req->rq_disk->disk_name, __func__, *stop_status);
 947                 *gen_err = true;
 948         }
 949
 950         return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
 951 }
 952
 953 #define ERR_NOMEDIUM    3
 954 #define ERR_RETRY       2
 955 #define ERR_ABORT       1
 956 #define ERR_CONTINUE    0
 957
 958 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
 959         bool status_valid, u32 status)
 960 {
 961         switch (error) {
 962         case -EILSEQ:
 963                 /* response crc error, retry the r/w cmd */
 964                 pr_err("%s: %s sending %s command, card status %#x\n",
 965                         req->rq_disk->disk_name, "response CRC error",
 966                         name, status);
 967                 return ERR_RETRY;
 968
 969         case -ETIMEDOUT:
 970                 pr_err("%s: %s sending %s command, card status %#x\n",
 971                         req->rq_disk->disk_name, "timed out", name, status);
 972
 973                 /* If the status cmd initially failed, retry the r/w cmd */
 974                 if (!status_valid) {
 975                         pr_err("%s: status not valid, retrying timeout\n",
 976                                 req->rq_disk->disk_name);
 977                         return ERR_RETRY;
 978                 }
 979
 980                 /*
 981                  * If it was a r/w cmd crc error, or illegal command
 982                  * (eg, issued in wrong state) then retry - we should
 983                  * have corrected the state problem above.
 984                  */
 985                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
 986                         pr_err("%s: command error, retrying timeout\n",
 987                                 req->rq_disk->disk_name);
 988                         return ERR_RETRY;
 989                 }
 990
 991                 /* Otherwise abort the command */
 992                 return ERR_ABORT;
 993
 994         default:
 995                 /* We don't understand the error code the driver gave us */
 996                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
 997                        req->rq_disk->disk_name, error, status);
 998                 return ERR_ABORT;
 999         }
1000 }
1001
1002 /*
1003  * Initial r/w and stop cmd error recovery.
1004  * We don't know whether the card received the r/w cmd or not, so try to
1005  * restore things back to a sane state.  Essentially, we do this as follows:
1006  * - Obtain card status.  If the first attempt to obtain card status fails,
1007  *   the status word will reflect the failed status cmd, not the failed
1008  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
1009  *   longer communicate with the card.
1010  * - Check the card state.  If the card received the cmd but there was a
1011  *   transient problem with the response, it might still be in a data transfer
1012  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
1013  * - If the r/w cmd failed due to a response CRC error, it was probably
1014  *   transient, so retry the cmd.
1015  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
1016  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
1017  *   illegal cmd, retry.
1018  * Otherwise we don't understand what happened, so abort.
1019  */
1020 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
1021         struct mmc_blk_request *brq, bool *ecc_err, bool *gen_err)
1022 {
1023         bool prev_cmd_status_valid = true;
1024         u32 status, stop_status = 0;
1025         int err, retry;
1026
1027         if (mmc_card_removed(card))
1028                 return ERR_NOMEDIUM;
1029
1030         /*
1031          * Try to get card status which indicates both the card state
1032          * and why there was no response.  If the first attempt fails,
1033          * we can't be sure the returned status is for the r/w command.
1034          */
1035         for (retry = 2; retry >= 0; retry--) {
1036                 err = __mmc_send_status(card, &status, 0);
1037                 if (!err)
1038                         break;
1039
1040                 /* Re-tune if needed */
1041                 mmc_retune_recheck(card->host);
1042
1043                 prev_cmd_status_valid = false;
1044                 pr_err("%s: error %d sending status command, %sing\n",
1045                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1046         }
1047
1048         /* We couldn't get a response from the card.  Give up. */
1049         if (err) {
1050                 /* Check if the card is removed */
1051                 if (mmc_detect_card_removed(card->host))
1052                         return ERR_NOMEDIUM;
1053                 return ERR_ABORT;
1054         }
1055
1056         /* Flag ECC errors */
1057         if ((status & R1_CARD_ECC_FAILED) ||
1058             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1059             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1060                 *ecc_err = true;
1061
1062         /* Flag General errors */
1063         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1064                 if ((status & R1_ERROR) ||
1065                         (brq->stop.resp[0] & R1_ERROR)) {
1066                         pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1067                                req->rq_disk->disk_name, __func__,
1068                                brq->stop.resp[0], status);
1069                         *gen_err = true;
1070                 }
1071
1072         /*
1073          * Check the current card state.  If it is in some data transfer
1074          * mode, tell it to stop (and hopefully transition back to TRAN.)
1075          */
1076         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1077             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1078                 err = send_stop(card,
1079                         DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1080                         req, gen_err, &stop_status);
1081                 if (err) {
1082                         pr_err("%s: error %d sending stop command\n",
1083                                req->rq_disk->disk_name, err);
1084                         /*
1085                          * If the stop cmd also timed out, the card is probably
1086                          * not present, so abort. Other errors are bad news too.
1087                          */
1088                         return ERR_ABORT;
1089                 }
1090
1091                 if (stop_status & R1_CARD_ECC_FAILED)
1092                         *ecc_err = true;
1093         }
1094
1095         /* Check for set block count errors */
1096         if (brq->sbc.error)
1097                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1098                                 prev_cmd_status_valid, status);
1099
1100         /* Check for r/w command errors */
1101         if (brq->cmd.error)
1102                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1103                                 prev_cmd_status_valid, status);
1104
1105         /* Data errors */
1106         if (!brq->stop.error)
1107                 return ERR_CONTINUE;
1108
1109         /* Now for stop errors.  These aren't fatal to the transfer. */
1110         pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1111                req->rq_disk->disk_name, brq->stop.error,
1112                brq->cmd.resp[0], status);
1113
1114         /*
1115          * Subsitute in our own stop status as this will give the error
1116          * state which happened during the execution of the r/w command.
1117          */
1118         if (stop_status) {
1119                 brq->stop.resp[0] = stop_status;
1120                 brq->stop.error = 0;
1121         }
1122         return ERR_CONTINUE;
1123 }
1124
1125 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1126                          int type)
1127 {
1128         int err;
1129
1130         if (md->reset_done & type)
1131                 return -EEXIST;
1132
1133         md->reset_done |= type;
1134         err = mmc_hw_reset(host);
1135         /* Ensure we switch back to the correct partition */
1136         if (err != -EOPNOTSUPP) {
1137                 struct mmc_blk_data *main_md =
1138                         dev_get_drvdata(&host->card->dev);
1139                 int part_err;
1140
1141                 main_md->part_curr = main_md->part_type;
1142                 part_err = mmc_blk_part_switch(host->card, md);
1143                 if (part_err) {
1144                         /*
1145                          * We have failed to get back into the correct
1146                          * partition, so we need to abort the whole request.
1147                          */
1148                         return -ENODEV;
1149                 }
1150         }
1151         return err;
1152 }
1153
1154 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1155 {
1156         md->reset_done &= ~type;
1157 }
1158
1159 int mmc_access_rpmb(struct mmc_queue *mq)
1160 {
1161         struct mmc_blk_data *md = mq->blkdata;
1162         /*
1163          * If this is a RPMB partition access, return ture
1164          */
1165         if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1166                 return true;
1167
1168         return false;
1169 }
1170
1171 /*
1172  * The non-block commands come back from the block layer after it queued it and
1173  * processed it with all other requests and then they get issued in this
1174  * function.
1175  */
1176 static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
1177 {
1178         struct mmc_queue_req *mq_rq;
1179         struct mmc_card *card = mq->card;
1180         struct mmc_blk_data *md = mq->blkdata;
1181         int ret;
1182         int i;
1183
1184         mq_rq = req_to_mmc_queue_req(req);
1185
1186         switch (mq_rq->drv_op) {
1187         case MMC_DRV_OP_IOCTL:
1188                 for (i = 0, ret = 0; i < mq_rq->ioc_count; i++) {
1189                         ret = __mmc_blk_ioctl_cmd(card, md, mq_rq->idata[i]);
1190                         if (ret)
1191                                 break;
1192                 }
1193                 /* Always switch back to main area after RPMB access */
1194                 if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
1195                         mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
1196                 break;
1197         case MMC_DRV_OP_BOOT_WP:
1198                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
1199                                  card->ext_csd.boot_ro_lock |
1200                                  EXT_CSD_BOOT_WP_B_PWR_WP_EN,
1201                                  card->ext_csd.part_time);
1202                 if (ret)
1203                         pr_err("%s: Locking boot partition ro until next power on failed: %d\n",
1204                                md->disk->disk_name, ret);
1205                 else
1206                         card->ext_csd.boot_ro_lock |=
1207                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN;
1208                 break;
1209         default:
1210                 pr_err("%s: unknown driver specific operation\n",
1211                        md->disk->disk_name);
1212                 ret = -EINVAL;
1213                 break;
1214         }
1215         mq_rq->drv_op_result = ret;
1216         blk_end_request_all(req, ret);
1217 }
1218
1219 static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1220 {
1221         struct mmc_blk_data *md = mq->blkdata;
1222         struct mmc_card *card = md->queue.card;
1223         unsigned int from, nr, arg;
1224         int err = 0, type = MMC_BLK_DISCARD;
1225         blk_status_t status = BLK_STS_OK;
1226
1227         if (!mmc_can_erase(card)) {
1228                 status = BLK_STS_NOTSUPP;
1229                 goto fail;
1230         }
1231
1232         from = blk_rq_pos(req);
1233         nr = blk_rq_sectors(req);
1234
1235         if (mmc_can_discard(card))
1236                 arg = MMC_DISCARD_ARG;
1237         else if (mmc_can_trim(card))
1238                 arg = MMC_TRIM_ARG;
1239         else
1240                 arg = MMC_ERASE_ARG;
1241         do {
1242                 err = 0;
1243                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1244                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1245                                          INAND_CMD38_ARG_EXT_CSD,
1246                                          arg == MMC_TRIM_ARG ?
1247                                          INAND_CMD38_ARG_TRIM :
1248                                          INAND_CMD38_ARG_ERASE,
1249                                          0);
1250                 }
1251                 if (!err)
1252                         err = mmc_erase(card, from, nr, arg);
1253         } while (err == -EIO && !mmc_blk_reset(md, card->host, type));
1254         if (err)
1255                 status = BLK_STS_IOERR;
1256         else
1257                 mmc_blk_reset_success(md, type);
1258 fail:
1259         blk_end_request(req, status, blk_rq_bytes(req));
1260 }
1261
1262 static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1263                                        struct request *req)
1264 {
1265         struct mmc_blk_data *md = mq->blkdata;
1266         struct mmc_card *card = md->queue.card;
1267         unsigned int from, nr, arg;
1268         int err = 0, type = MMC_BLK_SECDISCARD;
1269         blk_status_t status = BLK_STS_OK;
1270
1271         if (!(mmc_can_secure_erase_trim(card))) {
1272                 status = BLK_STS_NOTSUPP;
1273                 goto out;
1274         }
1275
1276         from = blk_rq_pos(req);
1277         nr = blk_rq_sectors(req);
1278
1279         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1280                 arg = MMC_SECURE_TRIM1_ARG;
1281         else
1282                 arg = MMC_SECURE_ERASE_ARG;
1283
1284 retry:
1285         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1286                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1287                                  INAND_CMD38_ARG_EXT_CSD,
1288                                  arg == MMC_SECURE_TRIM1_ARG ?
1289                                  INAND_CMD38_ARG_SECTRIM1 :
1290                                  INAND_CMD38_ARG_SECERASE,
1291                                  0);
1292                 if (err)
1293                         goto out_retry;
1294         }
1295
1296         err = mmc_erase(card, from, nr, arg);
1297         if (err == -EIO)
1298                 goto out_retry;
1299         if (err) {
1300                 status = BLK_STS_IOERR;
1301                 goto out;
1302         }
1303
1304         if (arg == MMC_SECURE_TRIM1_ARG) {
1305                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1306                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1307                                          INAND_CMD38_ARG_EXT_CSD,
1308                                          INAND_CMD38_ARG_SECTRIM2,
1309                                          0);
1310                         if (err)
1311                                 goto out_retry;
1312                 }
1313
1314                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1315                 if (err == -EIO)
1316                         goto out_retry;
1317                 if (err) {
1318                         status = BLK_STS_IOERR;
1319                         goto out;
1320                 }
1321         }
1322
1323 out_retry:
1324         if (err && !mmc_blk_reset(md, card->host, type))
1325                 goto retry;
1326         if (!err)
1327                 mmc_blk_reset_success(md, type);
1328 out:
1329         blk_end_request(req, status, blk_rq_bytes(req));
1330 }
1331
1332 static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1333 {
1334         struct mmc_blk_data *md = mq->blkdata;
1335         struct mmc_card *card = md->queue.card;
1336         int ret = 0;
1337
1338         ret = mmc_flush_cache(card);
1339         blk_end_request_all(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1340 }
1341
1342 /*
1343  * Reformat current write as a reliable write, supporting
1344  * both legacy and the enhanced reliable write MMC cards.
1345  * In each transfer we'll handle only as much as a single
1346  * reliable write can handle, thus finish the request in
1347  * partial completions.
1348  */
1349 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1350                                     struct mmc_card *card,
1351                                     struct request *req)
1352 {
1353         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1354                 /* Legacy mode imposes restrictions on transfers. */
1355                 if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors))
1356                         brq->data.blocks = 1;
1357
1358                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1359                         brq->data.blocks = card->ext_csd.rel_sectors;
1360                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1361                         brq->data.blocks = 1;
1362         }
1363 }
1364
1365 #define CMD_ERRORS                                                      \
1366         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1367          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1368          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1369          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1370          R1_CARD_ECC_FAILED |   /* Card ECC failed */                   \
1371          R1_CC_ERROR |          /* Card controller error */             \
1372          R1_ERROR)              /* General/unknown error */
1373
1374 static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq)
1375 {
1376         u32 val;
1377
1378         /*
1379          * Per the SD specification(physical layer version 4.10)[1],
1380          * section 4.3.3, it explicitly states that "When the last
1381          * block of user area is read using CMD18, the host should
1382          * ignore OUT_OF_RANGE error that may occur even the sequence
1383          * is correct". And JESD84-B51 for eMMC also has a similar
1384          * statement on section 6.8.3.
1385          *
1386          * Multiple block read/write could be done by either predefined
1387          * method, namely CMD23, or open-ending mode. For open-ending mode,
1388          * we should ignore the OUT_OF_RANGE error as it's normal behaviour.
1389          *
1390          * However the spec[1] doesn't tell us whether we should also
1391          * ignore that for predefined method. But per the spec[1], section
1392          * 4.15 Set Block Count Command, it says"If illegal block count
1393          * is set, out of range error will be indicated during read/write
1394          * operation (For example, data transfer is stopped at user area
1395          * boundary)." In another word, we could expect a out of range error
1396          * in the response for the following CMD18/25. And if argument of
1397          * CMD23 + the argument of CMD18/25 exceed the max number of blocks,
1398          * we could also expect to get a -ETIMEDOUT or any error number from
1399          * the host drivers due to missing data response(for write)/data(for
1400          * read), as the cards will stop the data transfer by itself per the
1401          * spec. So we only need to check R1_OUT_OF_RANGE for open-ending mode.
1402          */
1403
1404         if (!brq->stop.error) {
1405                 bool oor_with_open_end;
1406                 /* If there is no error yet, check R1 response */
1407
1408                 val = brq->stop.resp[0] & CMD_ERRORS;
1409                 oor_with_open_end = val & R1_OUT_OF_RANGE && !brq->mrq.sbc;
1410
1411                 if (val && !oor_with_open_end)
1412                         brq->stop.error = -EIO;
1413         }
1414 }
1415
1416 static enum mmc_blk_status mmc_blk_err_check(struct mmc_card *card,
1417                                              struct mmc_async_req *areq)
1418 {
1419         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1420                                                     areq);
1421         struct mmc_blk_request *brq = &mq_mrq->brq;
1422         struct request *req = mmc_queue_req_to_req(mq_mrq);
1423         int need_retune = card->host->need_retune;
1424         bool ecc_err = false;
1425         bool gen_err = false;
1426
1427         /*
1428          * sbc.error indicates a problem with the set block count
1429          * command.  No data will have been transferred.
1430          *
1431          * cmd.error indicates a problem with the r/w command.  No
1432          * data will have been transferred.
1433          *
1434          * stop.error indicates a problem with the stop command.  Data
1435          * may have been transferred, or may still be transferring.
1436          */
1437
1438         mmc_blk_eval_resp_error(brq);
1439
1440         if (brq->sbc.error || brq->cmd.error ||
1441             brq->stop.error || brq->data.error) {
1442                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1443                 case ERR_RETRY:
1444                         return MMC_BLK_RETRY;
1445                 case ERR_ABORT:
1446                         return MMC_BLK_ABORT;
1447                 case ERR_NOMEDIUM:
1448                         return MMC_BLK_NOMEDIUM;
1449                 case ERR_CONTINUE:
1450                         break;
1451                 }
1452         }
1453
1454         /*
1455          * Check for errors relating to the execution of the
1456          * initial command - such as address errors.  No data
1457          * has been transferred.
1458          */
1459         if (brq->cmd.resp[0] & CMD_ERRORS) {
1460                 pr_err("%s: r/w command failed, status = %#x\n",
1461                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1462                 return MMC_BLK_ABORT;
1463         }
1464
1465         /*
1466          * Everything else is either success, or a data error of some
1467          * kind.  If it was a write, we may have transitioned to
1468          * program mode, which we have to wait for it to complete.
1469          */
1470         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1471                 int err;
1472
1473                 /* Check stop command response */
1474                 if (brq->stop.resp[0] & R1_ERROR) {
1475                         pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1476                                req->rq_disk->disk_name, __func__,
1477                                brq->stop.resp[0]);
1478                         gen_err = true;
1479                 }
1480
1481                 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1482                                         &gen_err);
1483                 if (err)
1484                         return MMC_BLK_CMD_ERR;
1485         }
1486
1487         /* if general error occurs, retry the write operation. */
1488         if (gen_err) {
1489                 pr_warn("%s: retrying write for general error\n",
1490                                 req->rq_disk->disk_name);
1491                 return MMC_BLK_RETRY;
1492         }
1493
1494         /* Some errors (ECC) are flagged on the next commmand, so check stop, too */
1495         if (brq->data.error || brq->stop.error) {
1496                 if (need_retune && !brq->retune_retry_done) {
1497                         pr_debug("%s: retrying because a re-tune was needed\n",
1498                                  req->rq_disk->disk_name);
1499                         brq->retune_retry_done = 1;
1500                         return MMC_BLK_RETRY;
1501                 }
1502                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1503                        req->rq_disk->disk_name, brq->data.error ?: brq->stop.error,
1504                        (unsigned)blk_rq_pos(req),
1505                        (unsigned)blk_rq_sectors(req),
1506                        brq->cmd.resp[0], brq->stop.resp[0]);
1507
1508                 if (rq_data_dir(req) == READ) {
1509                         if (ecc_err)
1510                                 return MMC_BLK_ECC_ERR;
1511                         return MMC_BLK_DATA_ERR;
1512                 } else {
1513                         return MMC_BLK_CMD_ERR;
1514                 }
1515         }
1516
1517         if (!brq->data.bytes_xfered)
1518                 return MMC_BLK_RETRY;
1519
1520         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1521                 return MMC_BLK_PARTIAL;
1522
1523         return MMC_BLK_SUCCESS;
1524 }
1525
1526 static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
1527                               int disable_multi, bool *do_rel_wr,
1528                               bool *do_data_tag)
1529 {
1530         struct mmc_blk_data *md = mq->blkdata;
1531         struct mmc_card *card = md->queue.card;
1532         struct mmc_blk_request *brq = &mqrq->brq;
1533         struct request *req = mmc_queue_req_to_req(mqrq);
1534
1535         /*
1536          * Reliable writes are used to implement Forced Unit Access and
1537          * are supported only on MMCs.
1538          */
1539         *do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1540                      rq_data_dir(req) == WRITE &&
1541                      (md->flags & MMC_BLK_REL_WR);
1542
1543         memset(brq, 0, sizeof(struct mmc_blk_request));
1544
1545         brq->mrq.data = &brq->data;
1546
1547         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1548         brq->stop.arg = 0;
1549
1550         if (rq_data_dir(req) == READ) {
1551                 brq->data.flags = MMC_DATA_READ;
1552                 brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1553         } else {
1554                 brq->data.flags = MMC_DATA_WRITE;
1555                 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1556         }
1557
1558         brq->data.blksz = 512;
1559         brq->data.blocks = blk_rq_sectors(req);
1560
1561         /*
1562          * The block layer doesn't support all sector count
1563          * restrictions, so we need to be prepared for too big
1564          * requests.
1565          */
1566         if (brq->data.blocks > card->host->max_blk_count)
1567                 brq->data.blocks = card->host->max_blk_count;
1568
1569         if (brq->data.blocks > 1) {
1570                 /*
1571                  * After a read error, we redo the request one sector
1572                  * at a time in order to accurately determine which
1573                  * sectors can be read successfully.
1574                  */
1575                 if (disable_multi)
1576                         brq->data.blocks = 1;
1577
1578                 /*
1579                  * Some controllers have HW issues while operating
1580                  * in multiple I/O mode
1581                  */
1582                 if (card->host->ops->multi_io_quirk)
1583                         brq->data.blocks = card->host->ops->multi_io_quirk(card,
1584                                                 (rq_data_dir(req) == READ) ?
1585                                                 MMC_DATA_READ : MMC_DATA_WRITE,
1586                                                 brq->data.blocks);
1587         }
1588
1589         if (*do_rel_wr)
1590                 mmc_apply_rel_rw(brq, card, req);
1591
1592         /*
1593          * Data tag is used only during writing meta data to speed
1594          * up write and any subsequent read of this meta data
1595          */
1596         *do_data_tag = card->ext_csd.data_tag_unit_size &&
1597                        (req->cmd_flags & REQ_META) &&
1598                        (rq_data_dir(req) == WRITE) &&
1599                        ((brq->data.blocks * brq->data.blksz) >=
1600                         card->ext_csd.data_tag_unit_size);
1601
1602         mmc_set_data_timeout(&brq->data, card);
1603
1604         brq->data.sg = mqrq->sg;
1605         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1606
1607         /*
1608          * Adjust the sg list so it is the same size as the
1609          * request.
1610          */
1611         if (brq->data.blocks != blk_rq_sectors(req)) {
1612                 int i, data_size = brq->data.blocks << 9;
1613                 struct scatterlist *sg;
1614
1615                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1616                         data_size -= sg->length;
1617                         if (data_size <= 0) {
1618                                 sg->length += data_size;
1619                                 i++;
1620                                 break;
1621                         }
1622                 }
1623                 brq->data.sg_len = i;
1624         }
1625
1626         mqrq->areq.mrq = &brq->mrq;
1627
1628         mmc_queue_bounce_pre(mqrq);
1629 }
1630
1631 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1632                                struct mmc_card *card,
1633                                int disable_multi,
1634                                struct mmc_queue *mq)
1635 {
1636         u32 readcmd, writecmd;
1637         struct mmc_blk_request *brq = &mqrq->brq;
1638         struct request *req = mmc_queue_req_to_req(mqrq);
1639         struct mmc_blk_data *md = mq->blkdata;
1640         bool do_rel_wr, do_data_tag;
1641
1642         mmc_blk_data_prep(mq, mqrq, disable_multi, &do_rel_wr, &do_data_tag);
1643
1644         brq->mrq.cmd = &brq->cmd;
1645
1646         brq->cmd.arg = blk_rq_pos(req);
1647         if (!mmc_card_blockaddr(card))
1648                 brq->cmd.arg <<= 9;
1649         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1650
1651         if (brq->data.blocks > 1 || do_rel_wr) {
1652                 /* SPI multiblock writes terminate using a special
1653                  * token, not a STOP_TRANSMISSION request.
1654                  */
1655                 if (!mmc_host_is_spi(card->host) ||
1656                     rq_data_dir(req) == READ)
1657                         brq->mrq.stop = &brq->stop;
1658                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1659                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1660         } else {
1661                 brq->mrq.stop = NULL;
1662                 readcmd = MMC_READ_SINGLE_BLOCK;
1663                 writecmd = MMC_WRITE_BLOCK;
1664         }
1665         brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd;
1666
1667         /*
1668          * Pre-defined multi-block transfers are preferable to
1669          * open ended-ones (and necessary for reliable writes).
1670          * However, it is not sufficient to just send CMD23,
1671          * and avoid the final CMD12, as on an error condition
1672          * CMD12 (stop) needs to be sent anyway. This, coupled
1673          * with Auto-CMD23 enhancements provided by some
1674          * hosts, means that the complexity of dealing
1675          * with this is best left to the host. If CMD23 is
1676          * supported by card and host, we'll fill sbc in and let
1677          * the host deal with handling it correctly. This means
1678          * that for hosts that don't expose MMC_CAP_CMD23, no
1679          * change of behavior will be observed.
1680          *
1681          * N.B: Some MMC cards experience perf degradation.
1682          * We'll avoid using CMD23-bounded multiblock writes for
1683          * these, while retaining features like reliable writes.
1684          */
1685         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1686             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1687              do_data_tag)) {
1688                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1689                 brq->sbc.arg = brq->data.blocks |
1690                         (do_rel_wr ? (1 << 31) : 0) |
1691                         (do_data_tag ? (1 << 29) : 0);
1692                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1693                 brq->mrq.sbc = &brq->sbc;
1694         }
1695
1696         mqrq->areq.err_check = mmc_blk_err_check;
1697 }
1698
1699 static bool mmc_blk_rw_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1700                                struct mmc_blk_request *brq, struct request *req,
1701                                bool old_req_pending)
1702 {
1703         bool req_pending;
1704
1705         /*
1706          * If this is an SD card and we're writing, we can first
1707          * mark the known good sectors as ok.
1708          *
1709          * If the card is not SD, we can still ok written sectors
1710          * as reported by the controller (which might be less than
1711          * the real number of written sectors, but never more).
1712          */
1713         if (mmc_card_sd(card)) {
1714                 u32 blocks;
1715                 int err;
1716
1717                 err = mmc_sd_num_wr_blocks(card, &blocks);
1718                 if (err)
1719                         req_pending = old_req_pending;
1720                 else
1721                         req_pending = blk_end_request(req, 0, blocks << 9);
1722         } else {
1723                 req_pending = blk_end_request(req, 0, brq->data.bytes_xfered);
1724         }
1725         return req_pending;
1726 }
1727
1728 static void mmc_blk_rw_cmd_abort(struct mmc_queue *mq, struct mmc_card *card,
1729                                  struct request *req,
1730                                  struct mmc_queue_req *mqrq)
1731 {
1732         if (mmc_card_removed(card))
1733                 req->rq_flags |= RQF_QUIET;
1734         while (blk_end_request(req, BLK_STS_IOERR, blk_rq_cur_bytes(req)));
1735         mq->qcnt--;
1736 }
1737
1738 /**
1739  * mmc_blk_rw_try_restart() - tries to restart the current async request
1740  * @mq: the queue with the card and host to restart
1741  * @req: a new request that want to be started after the current one
1742  */
1743 static void mmc_blk_rw_try_restart(struct mmc_queue *mq, struct request *req,
1744                                    struct mmc_queue_req *mqrq)
1745 {
1746         if (!req)
1747                 return;
1748
1749         /*
1750          * If the card was removed, just cancel everything and return.
1751          */
1752         if (mmc_card_removed(mq->card)) {
1753                 req->rq_flags |= RQF_QUIET;
1754                 blk_end_request_all(req, BLK_STS_IOERR);
1755                 mq->qcnt--; /* FIXME: just set to 0? */
1756                 return;
1757         }
1758         /* Else proceed and try to restart the current async request */
1759         mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
1760         mmc_start_areq(mq->card->host, &mqrq->areq, NULL);
1761 }
1762
1763 static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
1764 {
1765         struct mmc_blk_data *md = mq->blkdata;
1766         struct mmc_card *card = md->queue.card;
1767         struct mmc_blk_request *brq;
1768         int disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1769         enum mmc_blk_status status;
1770         struct mmc_queue_req *mqrq_cur = NULL;
1771         struct mmc_queue_req *mq_rq;
1772         struct request *old_req;
1773         struct mmc_async_req *new_areq;
1774         struct mmc_async_req *old_areq;
1775         bool req_pending = true;
1776
1777         if (new_req) {
1778                 mqrq_cur = req_to_mmc_queue_req(new_req);
1779                 mq->qcnt++;
1780         }
1781
1782         if (!mq->qcnt)
1783                 return;
1784
1785         do {
1786                 if (new_req) {
1787                         /*
1788                          * When 4KB native sector is enabled, only 8 blocks
1789                          * multiple read or write is allowed
1790                          */
1791                         if (mmc_large_sector(card) &&
1792                                 !IS_ALIGNED(blk_rq_sectors(new_req), 8)) {
1793                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1794                                         new_req->rq_disk->disk_name);
1795                                 mmc_blk_rw_cmd_abort(mq, card, new_req, mqrq_cur);
1796                                 return;
1797                         }
1798
1799                         mmc_blk_rw_rq_prep(mqrq_cur, card, 0, mq);
1800                         new_areq = &mqrq_cur->areq;
1801                 } else
1802                         new_areq = NULL;
1803
1804                 old_areq = mmc_start_areq(card->host, new_areq, &status);
1805                 if (!old_areq) {
1806                         /*
1807                          * We have just put the first request into the pipeline
1808                          * and there is nothing more to do until it is
1809                          * complete.
1810                          */
1811                         return;
1812                 }
1813
1814                 /*
1815                  * An asynchronous request has been completed and we proceed
1816                  * to handle the result of it.
1817                  */
1818                 mq_rq = container_of(old_areq, struct mmc_queue_req, areq);
1819                 brq = &mq_rq->brq;
1820                 old_req = mmc_queue_req_to_req(mq_rq);
1821                 type = rq_data_dir(old_req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1822                 mmc_queue_bounce_post(mq_rq);
1823
1824                 switch (status) {
1825                 case MMC_BLK_SUCCESS:
1826                 case MMC_BLK_PARTIAL:
1827                         /*
1828                          * A block was successfully transferred.
1829                          */
1830                         mmc_blk_reset_success(md, type);
1831
1832                         req_pending = blk_end_request(old_req, BLK_STS_OK,
1833                                                       brq->data.bytes_xfered);
1834                         /*
1835                          * If the blk_end_request function returns non-zero even
1836                          * though all data has been transferred and no errors
1837                          * were returned by the host controller, it's a bug.
1838                          */
1839                         if (status == MMC_BLK_SUCCESS && req_pending) {
1840                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1841                                        __func__, blk_rq_bytes(old_req),
1842                                        brq->data.bytes_xfered);
1843                                 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1844                                 return;
1845                         }
1846                         break;
1847                 case MMC_BLK_CMD_ERR:
1848                         req_pending = mmc_blk_rw_cmd_err(md, card, brq, old_req, req_pending);
1849                         if (mmc_blk_reset(md, card->host, type)) {
1850                                 if (req_pending)
1851                                         mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1852                                 else
1853                                         mq->qcnt--;
1854                                 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1855                                 return;
1856                         }
1857                         if (!req_pending) {
1858                                 mq->qcnt--;
1859                                 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1860                                 return;
1861                         }
1862                         break;
1863                 case MMC_BLK_RETRY:
1864                         retune_retry_done = brq->retune_retry_done;
1865                         if (retry++ < 5)
1866                                 break;
1867                         /* Fall through */
1868                 case MMC_BLK_ABORT:
1869                         if (!mmc_blk_reset(md, card->host, type))
1870                                 break;
1871                         mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1872                         mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1873                         return;
1874                 case MMC_BLK_DATA_ERR: {
1875                         int err;
1876
1877                         err = mmc_blk_reset(md, card->host, type);
1878                         if (!err)
1879                                 break;
1880                         if (err == -ENODEV) {
1881                                 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1882                                 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1883                                 return;
1884                         }
1885                         /* Fall through */
1886                 }
1887                 case MMC_BLK_ECC_ERR:
1888                         if (brq->data.blocks > 1) {
1889                                 /* Redo read one sector at a time */
1890                                 pr_warn("%s: retrying using single block read\n",
1891                                         old_req->rq_disk->disk_name);
1892                                 disable_multi = 1;
1893                                 break;
1894                         }
1895                         /*
1896                          * After an error, we redo I/O one sector at a
1897                          * time, so we only reach here after trying to
1898                          * read a single sector.
1899                          */
1900                         req_pending = blk_end_request(old_req, BLK_STS_IOERR,
1901                                                       brq->data.blksz);
1902                         if (!req_pending) {
1903                                 mq->qcnt--;
1904                                 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1905                                 return;
1906                         }
1907                         break;
1908                 case MMC_BLK_NOMEDIUM:
1909                         mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1910                         mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1911                         return;
1912                 default:
1913                         pr_err("%s: Unhandled return value (%d)",
1914                                         old_req->rq_disk->disk_name, status);
1915                         mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1916                         mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1917                         return;
1918                 }
1919
1920                 if (req_pending) {
1921                         /*
1922                          * In case of a incomplete request
1923                          * prepare it again and resend.
1924                          */
1925                         mmc_blk_rw_rq_prep(mq_rq, card,
1926                                         disable_multi, mq);
1927                         mmc_start_areq(card->host,
1928                                         &mq_rq->areq, NULL);
1929                         mq_rq->brq.retune_retry_done = retune_retry_done;
1930                 }
1931         } while (req_pending);
1932
1933         mq->qcnt--;
1934 }
1935
1936 void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1937 {
1938         int ret;
1939         struct mmc_blk_data *md = mq->blkdata;
1940         struct mmc_card *card = md->queue.card;
1941
1942         if (req && !mq->qcnt)
1943                 /* claim host only for the first request */
1944                 mmc_get_card(card);
1945
1946         ret = mmc_blk_part_switch(card, md);
1947         if (ret) {
1948                 if (req) {
1949                         blk_end_request_all(req, BLK_STS_IOERR);
1950                 }
1951                 goto out;
1952         }
1953
1954         if (req) {
1955                 switch (req_op(req)) {
1956                 case REQ_OP_DRV_IN:
1957                 case REQ_OP_DRV_OUT:
1958                         /*
1959                          * Complete ongoing async transfer before issuing
1960                          * ioctl()s
1961                          */
1962                         if (mq->qcnt)
1963                                 mmc_blk_issue_rw_rq(mq, NULL);
1964                         mmc_blk_issue_drv_op(mq, req);
1965                         break;
1966                 case REQ_OP_DISCARD:
1967                         /*
1968                          * Complete ongoing async transfer before issuing
1969                          * discard.
1970                          */
1971                         if (mq->qcnt)
1972                                 mmc_blk_issue_rw_rq(mq, NULL);
1973                         mmc_blk_issue_discard_rq(mq, req);
1974                         break;
1975                 case REQ_OP_SECURE_ERASE:
1976                         /*
1977                          * Complete ongoing async transfer before issuing
1978                          * secure erase.
1979                          */
1980                         if (mq->qcnt)
1981                                 mmc_blk_issue_rw_rq(mq, NULL);
1982                         mmc_blk_issue_secdiscard_rq(mq, req);
1983                         break;
1984                 case REQ_OP_FLUSH:
1985                         /*
1986                          * Complete ongoing async transfer before issuing
1987                          * flush.
1988                          */
1989                         if (mq->qcnt)
1990                                 mmc_blk_issue_rw_rq(mq, NULL);
1991                         mmc_blk_issue_flush(mq, req);
1992                         break;
1993                 default:
1994                         /* Normal request, just issue it */
1995                         mmc_blk_issue_rw_rq(mq, req);
1996                         card->host->context_info.is_waiting_last_req = false;
1997                         break;
1998                 }
1999         } else {
2000                 /* No request, flushing the pipeline with NULL */
2001                 mmc_blk_issue_rw_rq(mq, NULL);
2002                 card->host->context_info.is_waiting_last_req = false;
2003         }
2004
2005 out:
2006         if (!mq->qcnt)
2007                 mmc_put_card(card);
2008 }
2009
2010 static inline int mmc_blk_readonly(struct mmc_card *card)
2011 {
2012         return mmc_card_readonly(card) ||
2013                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2014 }
2015
2016 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2017                                               struct device *parent,
2018                                               sector_t size,
2019                                               bool default_ro,
2020                                               const char *subname,
2021                                               int area_type)
2022 {
2023         struct mmc_blk_data *md;
2024         int devidx, ret;
2025
2026         devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL);
2027         if (devidx < 0)
2028                 return ERR_PTR(devidx);
2029
2030         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2031         if (!md) {
2032                 ret = -ENOMEM;
2033                 goto out;
2034         }
2035
2036         md->area_type = area_type;
2037
2038         /*
2039          * Set the read-only status based on the supported commands
2040          * and the write protect switch.
2041          */
2042         md->read_only = mmc_blk_readonly(card);
2043
2044         md->disk = alloc_disk(perdev_minors);
2045         if (md->disk == NULL) {
2046                 ret = -ENOMEM;
2047                 goto err_kfree;
2048         }
2049
2050         spin_lock_init(&md->lock);
2051         INIT_LIST_HEAD(&md->part);
2052         md->usage = 1;
2053
2054         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2055         if (ret)
2056                 goto err_putdisk;
2057
2058         md->queue.blkdata = md;
2059
2060         md->disk->major = MMC_BLOCK_MAJOR;
2061         md->disk->first_minor = devidx * perdev_minors;
2062         md->disk->fops = &mmc_bdops;
2063         md->disk->private_data = md;
2064         md->disk->queue = md->queue.queue;
2065         md->parent = parent;
2066         set_disk_ro(md->disk, md->read_only || default_ro);
2067         md->disk->flags = GENHD_FL_EXT_DEVT;
2068         if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2069                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2070
2071         /*
2072          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2073          *
2074          * - be set for removable media with permanent block devices
2075          * - be unset for removable block devices with permanent media
2076          *
2077          * Since MMC block devices clearly fall under the second
2078          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2079          * should use the block device creation/destruction hotplug
2080          * messages to tell when the card is present.
2081          */
2082
2083         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2084                  "mmcblk%u%s", card->host->index, subname ? subname : "");
2085
2086         if (mmc_card_mmc(card))
2087                 blk_queue_logical_block_size(md->queue.queue,
2088                                              card->ext_csd.data_sector_size);
2089         else
2090                 blk_queue_logical_block_size(md->queue.queue, 512);
2091
2092         set_capacity(md->disk, size);
2093
2094         if (mmc_host_cmd23(card->host)) {
2095                 if ((mmc_card_mmc(card) &&
2096                      card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
2097                     (mmc_card_sd(card) &&
2098                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2099                         md->flags |= MMC_BLK_CMD23;
2100         }
2101
2102         if (mmc_card_mmc(card) &&
2103             md->flags & MMC_BLK_CMD23 &&
2104             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2105              card->ext_csd.rel_sectors)) {
2106                 md->flags |= MMC_BLK_REL_WR;
2107                 blk_queue_write_cache(md->queue.queue, true, true);
2108         }
2109
2110         return md;
2111
2112  err_putdisk:
2113         put_disk(md->disk);
2114  err_kfree:
2115         kfree(md);
2116  out:
2117         ida_simple_remove(&mmc_blk_ida, devidx);
2118         return ERR_PTR(ret);
2119 }
2120
2121 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2122 {
2123         sector_t size;
2124
2125         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2126                 /*
2127                  * The EXT_CSD sector count is in number or 512 byte
2128                  * sectors.
2129                  */
2130                 size = card->ext_csd.sectors;
2131         } else {
2132                 /*
2133                  * The CSD capacity field is in units of read_blkbits.
2134                  * set_capacity takes units of 512 bytes.
2135                  */
2136                 size = (typeof(sector_t))card->csd.capacity
2137                         << (card->csd.read_blkbits - 9);
2138         }
2139
2140         return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2141                                         MMC_BLK_DATA_AREA_MAIN);
2142 }
2143
2144 static int mmc_blk_alloc_part(struct mmc_card *card,
2145                               struct mmc_blk_data *md,
2146                               unsigned int part_type,
2147                               sector_t size,
2148                               bool default_ro,
2149                               const char *subname,
2150                               int area_type)
2151 {
2152         char cap_str[10];
2153         struct mmc_blk_data *part_md;
2154
2155         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2156                                     subname, area_type);
2157         if (IS_ERR(part_md))
2158                 return PTR_ERR(part_md);
2159         part_md->part_type = part_type;
2160         list_add(&part_md->part, &md->part);
2161
2162         string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2163                         cap_str, sizeof(cap_str));
2164         pr_info("%s: %s %s partition %u %s\n",
2165                part_md->disk->disk_name, mmc_card_id(card),
2166                mmc_card_name(card), part_md->part_type, cap_str);
2167         return 0;
2168 }
2169
2170 /* MMC Physical partitions consist of two boot partitions and
2171  * up to four general purpose partitions.
2172  * For each partition enabled in EXT_CSD a block device will be allocatedi
2173  * to provide access to the partition.
2174  */
2175
2176 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2177 {
2178         int idx, ret = 0;
2179
2180         if (!mmc_card_mmc(card))
2181                 return 0;
2182
2183         for (idx = 0; idx < card->nr_parts; idx++) {
2184                 if (card->part[idx].size) {
2185                         ret = mmc_blk_alloc_part(card, md,
2186                                 card->part[idx].part_cfg,
2187                                 card->part[idx].size >> 9,
2188                                 card->part[idx].force_ro,
2189                                 card->part[idx].name,
2190                                 card->part[idx].area_type);
2191                         if (ret)
2192                                 return ret;
2193                 }
2194         }
2195
2196         return ret;
2197 }
2198
2199 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2200 {
2201         struct mmc_card *card;
2202
2203         if (md) {
2204                 /*
2205                  * Flush remaining requests and free queues. It
2206                  * is freeing the queue that stops new requests
2207                  * from being accepted.
2208                  */
2209                 card = md->queue.card;
2210                 spin_lock_irq(md->queue.queue->queue_lock);
2211                 queue_flag_set(QUEUE_FLAG_BYPASS, md->queue.queue);
2212                 spin_unlock_irq(md->queue.queue->queue_lock);
2213                 blk_set_queue_dying(md->queue.queue);
2214                 mmc_cleanup_queue(&md->queue);
2215                 if (md->disk->flags & GENHD_FL_UP) {
2216                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2217                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2218                                         card->ext_csd.boot_ro_lockable)
2219                                 device_remove_file(disk_to_dev(md->disk),
2220                                         &md->power_ro_lock);
2221
2222                         del_gendisk(md->disk);
2223                 }
2224                 mmc_blk_put(md);
2225         }
2226 }
2227
2228 static void mmc_blk_remove_parts(struct mmc_card *card,
2229                                  struct mmc_blk_data *md)
2230 {
2231         struct list_head *pos, *q;
2232         struct mmc_blk_data *part_md;
2233
2234         list_for_each_safe(pos, q, &md->part) {
2235                 part_md = list_entry(pos, struct mmc_blk_data, part);
2236                 list_del(pos);
2237                 mmc_blk_remove_req(part_md);
2238         }
2239 }
2240
2241 static int mmc_add_disk(struct mmc_blk_data *md)
2242 {
2243         int ret;
2244         struct mmc_card *card = md->queue.card;
2245
2246         device_add_disk(md->parent, md->disk);
2247         md->force_ro.show = force_ro_show;
2248         md->force_ro.store = force_ro_store;
2249         sysfs_attr_init(&md->force_ro.attr);
2250         md->force_ro.attr.name = "force_ro";
2251         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2252         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2253         if (ret)
2254                 goto force_ro_fail;
2255
2256         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2257              card->ext_csd.boot_ro_lockable) {
2258                 umode_t mode;
2259
2260                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2261                         mode = S_IRUGO;
2262                 else
2263                         mode = S_IRUGO | S_IWUSR;
2264
2265                 md->power_ro_lock.show = power_ro_lock_show;
2266                 md->power_ro_lock.store = power_ro_lock_store;
2267                 sysfs_attr_init(&md->power_ro_lock.attr);
2268                 md->power_ro_lock.attr.mode = mode;
2269                 md->power_ro_lock.attr.name =
2270                                         "ro_lock_until_next_power_on";
2271                 ret = device_create_file(disk_to_dev(md->disk),
2272                                 &md->power_ro_lock);
2273                 if (ret)
2274                         goto power_ro_lock_fail;
2275         }
2276         return ret;
2277
2278 power_ro_lock_fail:
2279         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2280 force_ro_fail:
2281         del_gendisk(md->disk);
2282
2283         return ret;
2284 }
2285
2286 static int mmc_blk_probe(struct mmc_card *card)
2287 {
2288         struct mmc_blk_data *md, *part_md;
2289         char cap_str[10];
2290
2291         /*
2292          * Check that the card supports the command class(es) we need.
2293          */
2294         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2295                 return -ENODEV;
2296
2297         mmc_fixup_device(card, mmc_blk_fixups);
2298
2299         md = mmc_blk_alloc(card);
2300         if (IS_ERR(md))
2301                 return PTR_ERR(md);
2302
2303         string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2304                         cap_str, sizeof(cap_str));
2305         pr_info("%s: %s %s %s %s\n",
2306                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2307                 cap_str, md->read_only ? "(ro)" : "");
2308
2309         if (mmc_blk_alloc_parts(card, md))
2310                 goto out;
2311
2312         dev_set_drvdata(&card->dev, md);
2313
2314         if (mmc_add_disk(md))
2315                 goto out;
2316
2317         list_for_each_entry(part_md, &md->part, part) {
2318                 if (mmc_add_disk(part_md))
2319                         goto out;
2320         }
2321
2322         pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2323         pm_runtime_use_autosuspend(&card->dev);
2324
2325         /*
2326          * Don't enable runtime PM for SD-combo cards here. Leave that
2327          * decision to be taken during the SDIO init sequence instead.
2328          */
2329         if (card->type != MMC_TYPE_SD_COMBO) {
2330                 pm_runtime_set_active(&card->dev);
2331                 pm_runtime_enable(&card->dev);
2332         }
2333
2334         return 0;
2335
2336  out:
2337         mmc_blk_remove_parts(card, md);
2338         mmc_blk_remove_req(md);
2339         return 0;
2340 }
2341
2342 static void mmc_blk_remove(struct mmc_card *card)
2343 {
2344         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2345
2346         mmc_blk_remove_parts(card, md);
2347         pm_runtime_get_sync(&card->dev);
2348         mmc_claim_host(card->host);
2349         mmc_blk_part_switch(card, md);
2350         mmc_release_host(card->host);
2351         if (card->type != MMC_TYPE_SD_COMBO)
2352                 pm_runtime_disable(&card->dev);
2353         pm_runtime_put_noidle(&card->dev);
2354         mmc_blk_remove_req(md);
2355         dev_set_drvdata(&card->dev, NULL);
2356 }
2357
2358 static int _mmc_blk_suspend(struct mmc_card *card)
2359 {
2360         struct mmc_blk_data *part_md;
2361         struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2362
2363         if (md) {
2364                 mmc_queue_suspend(&md->queue);
2365                 list_for_each_entry(part_md, &md->part, part) {
2366                         mmc_queue_suspend(&part_md->queue);
2367                 }
2368         }
2369         return 0;
2370 }
2371
2372 static void mmc_blk_shutdown(struct mmc_card *card)
2373 {
2374         _mmc_blk_suspend(card);
2375 }
2376
2377 #ifdef CONFIG_PM_SLEEP
2378 static int mmc_blk_suspend(struct device *dev)
2379 {
2380         struct mmc_card *card = mmc_dev_to_card(dev);
2381
2382         return _mmc_blk_suspend(card);
2383 }
2384
2385 static int mmc_blk_resume(struct device *dev)
2386 {
2387         struct mmc_blk_data *part_md;
2388         struct mmc_blk_data *md = dev_get_drvdata(dev);
2389
2390         if (md) {
2391                 /*
2392                  * Resume involves the card going into idle state,
2393                  * so current partition is always the main one.
2394                  */
2395                 md->part_curr = md->part_type;
2396                 mmc_queue_resume(&md->queue);
2397                 list_for_each_entry(part_md, &md->part, part) {
2398                         mmc_queue_resume(&part_md->queue);
2399                 }
2400         }
2401         return 0;
2402 }
2403 #endif
2404
2405 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2406
2407 static struct mmc_driver mmc_driver = {
2408         .drv            = {
2409                 .name   = "mmcblk",
2410                 .pm     = &mmc_blk_pm_ops,
2411         },
2412         .probe          = mmc_blk_probe,
2413         .remove         = mmc_blk_remove,
2414         .shutdown       = mmc_blk_shutdown,
2415 };
2416
2417 static int __init mmc_blk_init(void)
2418 {
2419         int res;
2420
2421         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2422                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2423
2424         max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2425
2426         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2427         if (res)
2428                 goto out;
2429
2430         res = mmc_register_driver(&mmc_driver);
2431         if (res)
2432                 goto out2;
2433
2434         return 0;
2435  out2:
2436         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2437  out:
2438         return res;
2439 }
2440
2441 static void __exit mmc_blk_exit(void)
2442 {
2443         mmc_unregister_driver(&mmc_driver);
2444         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2445 }
2446
2447 module_init(mmc_blk_init);
2448 module_exit(mmc_blk_exit);
2449
2450 MODULE_LICENSE("GPL");
2451 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2452