drivers/mmc/card/block.c

   1 /*
   2  * Block driver for media (i.e., flash cards)
   3  *
   4  * Copyright 2002 Hewlett-Packard Company
   5  * Copyright 2005-2008 Pierre Ossman
   6  *
   7  * Use consistent with the GNU GPL is permitted,
   8  * provided that this copyright notice is
   9  * preserved in its entirety in all copies and derived works.
  10  *
  11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
  12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
  13  * FITNESS FOR ANY PARTICULAR PURPOSE.
  14  *
  15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
  16  *
  17  * Author:  Andrew Christian
  18  *          28 May 2002
  19  */
  20 #include <linux/moduleparam.h>
  21 #include <linux/module.h>
  22 #include <linux/init.h>
  23
  24 #include <linux/kernel.h>
  25 #include <linux/fs.h>
  26 #include <linux/slab.h>
  27 #include <linux/errno.h>
  28 #include <linux/hdreg.h>
  29 #include <linux/kdev_t.h>
  30 #include <linux/blkdev.h>
  31 #include <linux/mutex.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/string_helpers.h>
  34
  35 #include <linux/mmc/card.h>
  36 #include <linux/mmc/host.h>
  37 #include <linux/mmc/mmc.h>
  38 #include <linux/mmc/sd.h>
  39
  40 #include <asm/system.h>
  41 #include <asm/uaccess.h>
  42
  43 #include "queue.h"
  44
  45 MODULE_ALIAS("mmc:block");
  46 #ifdef MODULE_PARAM_PREFIX
  47 #undef MODULE_PARAM_PREFIX
  48 #endif
  49 #define MODULE_PARAM_PREFIX "mmcblk."
  50
  51 #define REL_WRITES_SUPPORTED(card) (mmc_card_mmc((card)) &&     \
  52     (((card)->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||   \
  53      ((card)->ext_csd.rel_sectors)))
  54
  55 static DEFINE_MUTEX(block_mutex);
  56
  57 /*
  58  * The defaults come from config options but can be overriden by module
  59  * or bootarg options.
  60  */
  61 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
  62
  63 /*
  64  * We've only got one major, so number of mmcblk devices is
  65  * limited to 256 / number of minors per device.
  66  */
  67 static int max_devices;
  68
  69 /* 256 minors, so at most 256 separate devices */
  70 static DECLARE_BITMAP(dev_use, 256);
  71
  72 /*
  73  * There is one mmc_blk_data per slot.
  74  */
  75 struct mmc_blk_data {
  76         spinlock_t      lock;
  77         struct gendisk  *disk;
  78         struct mmc_queue queue;
  79         struct list_head part;
  80
  81         unsigned int    usage;
  82         unsigned int    read_only;
  83         unsigned int    part_type;
  84
  85         /*
  86          * Only set in main mmc_blk_data associated
  87          * with mmc_card with mmc_set_drvdata, and keeps
  88          * track of the current selected device partition.
  89          */
  90         unsigned int    part_curr;
  91         struct device_attribute force_ro;
  92 };
  93
  94 static DEFINE_MUTEX(open_lock);
  95
  96 module_param(perdev_minors, int, 0444);
  97 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
  98
  99 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
 100 {
 101         struct mmc_blk_data *md;
 102
 103         mutex_lock(&open_lock);
 104         md = disk->private_data;
 105         if (md && md->usage == 0)
 106                 md = NULL;
 107         if (md)
 108                 md->usage++;
 109         mutex_unlock(&open_lock);
 110
 111         return md;
 112 }
 113
 114 static inline int mmc_get_devidx(struct gendisk *disk)
 115 {
 116         int devmaj = MAJOR(disk_devt(disk));
 117         int devidx = MINOR(disk_devt(disk)) / perdev_minors;
 118
 119         if (!devmaj)
 120                 devidx = disk->first_minor / perdev_minors;
 121         return devidx;
 122 }
 123
 124 static void mmc_blk_put(struct mmc_blk_data *md)
 125 {
 126         mutex_lock(&open_lock);
 127         md->usage--;
 128         if (md->usage == 0) {
 129                 int devidx = mmc_get_devidx(md->disk);
 130                 blk_cleanup_queue(md->queue.queue);
 131
 132                 __clear_bit(devidx, dev_use);
 133
 134                 put_disk(md->disk);
 135                 kfree(md);
 136         }
 137         mutex_unlock(&open_lock);
 138 }
 139
 140 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
 141                              char *buf)
 142 {
 143         int ret;
 144         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 145
 146         ret = snprintf(buf, PAGE_SIZE, "%d",
 147                        get_disk_ro(dev_to_disk(dev)) ^
 148                        md->read_only);
 149         mmc_blk_put(md);
 150         return ret;
 151 }
 152
 153 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
 154                               const char *buf, size_t count)
 155 {
 156         int ret;
 157         char *end;
 158         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
 159         unsigned long set = simple_strtoul(buf, &end, 0);
 160         if (end == buf) {
 161                 ret = -EINVAL;
 162                 goto out;
 163         }
 164
 165         set_disk_ro(dev_to_disk(dev), set || md->read_only);
 166         ret = count;
 167 out:
 168         mmc_blk_put(md);
 169         return ret;
 170 }
 171
 172 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
 173 {
 174         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
 175         int ret = -ENXIO;
 176
 177         mutex_lock(&block_mutex);
 178         if (md) {
 179                 if (md->usage == 2)
 180                         check_disk_change(bdev);
 181                 ret = 0;
 182
 183                 if ((mode & FMODE_WRITE) && md->read_only) {
 184                         mmc_blk_put(md);
 185                         ret = -EROFS;
 186                 }
 187         }
 188         mutex_unlock(&block_mutex);
 189
 190         return ret;
 191 }
 192
 193 static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
 194 {
 195         struct mmc_blk_data *md = disk->private_data;
 196
 197         mutex_lock(&block_mutex);
 198         mmc_blk_put(md);
 199         mutex_unlock(&block_mutex);
 200         return 0;
 201 }
 202
 203 static int
 204 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
 205 {
 206         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
 207         geo->heads = 4;
 208         geo->sectors = 16;
 209         return 0;
 210 }
 211
 212 static const struct block_device_operations mmc_bdops = {
 213         .open                   = mmc_blk_open,
 214         .release                = mmc_blk_release,
 215         .getgeo                 = mmc_blk_getgeo,
 216         .owner                  = THIS_MODULE,
 217 };
 218
 219 struct mmc_blk_request {
 220         struct mmc_request      mrq;
 221         struct mmc_command      cmd;
 222         struct mmc_command      stop;
 223         struct mmc_data         data;
 224 };
 225
 226 static inline int mmc_blk_part_switch(struct mmc_card *card,
 227                                       struct mmc_blk_data *md)
 228 {
 229         int ret;
 230         struct mmc_blk_data *main_md = mmc_get_drvdata(card);
 231         if (main_md->part_curr == md->part_type)
 232                 return 0;
 233
 234         if (mmc_card_mmc(card)) {
 235                 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
 236                 card->ext_csd.part_config |= md->part_type;
 237
 238                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
 239                                  EXT_CSD_PART_CONFIG, card->ext_csd.part_config,
 240                                  card->ext_csd.part_time);
 241                 if (ret)
 242                         return ret;
 243 }
 244
 245         main_md->part_curr = md->part_type;
 246         return 0;
 247 }
 248
 249 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 250 {
 251         int err;
 252         u32 result;
 253         __be32 *blocks;
 254
 255         struct mmc_request mrq;
 256         struct mmc_command cmd;
 257         struct mmc_data data;
 258         unsigned int timeout_us;
 259
 260         struct scatterlist sg;
 261
 262         memset(&cmd, 0, sizeof(struct mmc_command));
 263
 264         cmd.opcode = MMC_APP_CMD;
 265         cmd.arg = card->rca << 16;
 266         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
 267
 268         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 269         if (err)
 270                 return (u32)-1;
 271         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
 272                 return (u32)-1;
 273
 274         memset(&cmd, 0, sizeof(struct mmc_command));
 275
 276         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
 277         cmd.arg = 0;
 278         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 279
 280         memset(&data, 0, sizeof(struct mmc_data));
 281
 282         data.timeout_ns = card->csd.tacc_ns * 100;
 283         data.timeout_clks = card->csd.tacc_clks * 100;
 284
 285         timeout_us = data.timeout_ns / 1000;
 286         timeout_us += data.timeout_clks * 1000 /
 287                 (card->host->ios.clock / 1000);
 288
 289         if (timeout_us > 100000) {
 290                 data.timeout_ns = 100000000;
 291                 data.timeout_clks = 0;
 292         }
 293
 294         data.blksz = 4;
 295         data.blocks = 1;
 296         data.flags = MMC_DATA_READ;
 297         data.sg = &sg;
 298         data.sg_len = 1;
 299
 300         memset(&mrq, 0, sizeof(struct mmc_request));
 301
 302         mrq.cmd = &cmd;
 303         mrq.data = &data;
 304
 305         blocks = kmalloc(4, GFP_KERNEL);
 306         if (!blocks)
 307                 return (u32)-1;
 308
 309         sg_init_one(&sg, blocks, 4);
 310
 311         mmc_wait_for_req(card->host, &mrq);
 312
 313         result = ntohl(*blocks);
 314         kfree(blocks);
 315
 316         if (cmd.error || data.error)
 317                 result = (u32)-1;
 318
 319         return result;
 320 }
 321
 322 static u32 get_card_status(struct mmc_card *card, struct request *req)
 323 {
 324         struct mmc_command cmd;
 325         int err;
 326
 327         memset(&cmd, 0, sizeof(struct mmc_command));
 328         cmd.opcode = MMC_SEND_STATUS;
 329         if (!mmc_host_is_spi(card->host))
 330                 cmd.arg = card->rca << 16;
 331         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
 332         err = mmc_wait_for_cmd(card->host, &cmd, 0);
 333         if (err)
 334                 printk(KERN_ERR "%s: error %d sending status command",
 335                        req->rq_disk->disk_name, err);
 336         return cmd.resp[0];
 337 }
 338
 339 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
 340 {
 341         struct mmc_blk_data *md = mq->data;
 342         struct mmc_card *card = md->queue.card;
 343         unsigned int from, nr, arg;
 344         int err = 0;
 345
 346         if (!mmc_can_erase(card)) {
 347                 err = -EOPNOTSUPP;
 348                 goto out;
 349         }
 350
 351         from = blk_rq_pos(req);
 352         nr = blk_rq_sectors(req);
 353
 354         if (mmc_can_trim(card))
 355                 arg = MMC_TRIM_ARG;
 356         else
 357                 arg = MMC_ERASE_ARG;
 358
 359         err = mmc_erase(card, from, nr, arg);
 360 out:
 361         spin_lock_irq(&md->lock);
 362         __blk_end_request(req, err, blk_rq_bytes(req));
 363         spin_unlock_irq(&md->lock);
 364
 365         return err ? 0 : 1;
 366 }
 367
 368 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
 369                                        struct request *req)
 370 {
 371         struct mmc_blk_data *md = mq->data;
 372         struct mmc_card *card = md->queue.card;
 373         unsigned int from, nr, arg;
 374         int err = 0;
 375
 376         if (!mmc_can_secure_erase_trim(card)) {
 377                 err = -EOPNOTSUPP;
 378                 goto out;
 379         }
 380
 381         from = blk_rq_pos(req);
 382         nr = blk_rq_sectors(req);
 383
 384         if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
 385                 arg = MMC_SECURE_TRIM1_ARG;
 386         else
 387                 arg = MMC_SECURE_ERASE_ARG;
 388
 389         err = mmc_erase(card, from, nr, arg);
 390         if (!err && arg == MMC_SECURE_TRIM1_ARG)
 391                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
 392 out:
 393         spin_lock_irq(&md->lock);
 394         __blk_end_request(req, err, blk_rq_bytes(req));
 395         spin_unlock_irq(&md->lock);
 396
 397         return err ? 0 : 1;
 398 }
 399
 400 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
 401 {
 402         struct mmc_blk_data *md = mq->data;
 403
 404         /*
 405          * No-op, only service this because we need REQ_FUA for reliable
 406          * writes.
 407          */
 408         spin_lock_irq(&md->lock);
 409         __blk_end_request_all(req, 0);
 410         spin_unlock_irq(&md->lock);
 411
 412         return 1;
 413 }
 414
 415 /*
 416  * Reformat current write as a reliable write, supporting
 417  * both legacy and the enhanced reliable write MMC cards.
 418  * In each transfer we'll handle only as much as a single
 419  * reliable write can handle, thus finish the request in
 420  * partial completions.
 421  */
 422 static inline int mmc_apply_rel_rw(struct mmc_blk_request *brq,
 423                                    struct mmc_card *card,
 424                                    struct request *req)
 425 {
 426         int err;
 427         struct mmc_command set_count;
 428
 429         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
 430                 /* Legacy mode imposes restrictions on transfers. */
 431                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
 432                         brq->data.blocks = 1;
 433
 434                 if (brq->data.blocks > card->ext_csd.rel_sectors)
 435                         brq->data.blocks = card->ext_csd.rel_sectors;
 436                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
 437                         brq->data.blocks = 1;
 438         }
 439
 440         memset(&set_count, 0, sizeof(struct mmc_command));
 441         set_count.opcode = MMC_SET_BLOCK_COUNT;
 442         set_count.arg = brq->data.blocks | (1 << 31);
 443         set_count.flags = MMC_RSP_R1 | MMC_CMD_AC;
 444         err = mmc_wait_for_cmd(card->host, &set_count, 0);
 445         if (err)
 446                 printk(KERN_ERR "%s: error %d SET_BLOCK_COUNT\n",
 447                        req->rq_disk->disk_name, err);
 448         return err;
 449 }
 450
 451 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *req)
 452 {
 453         struct mmc_blk_data *md = mq->data;
 454         struct mmc_card *card = md->queue.card;
 455         struct mmc_blk_request brq;
 456         int ret = 1, disable_multi = 0;
 457
 458         /*
 459          * Reliable writes are used to implement Forced Unit Access and
 460          * REQ_META accesses, and are supported only on MMCs.
 461          */
 462         bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
 463                           (req->cmd_flags & REQ_META)) &&
 464                 (rq_data_dir(req) == WRITE) &&
 465                 REL_WRITES_SUPPORTED(card);
 466
 467         do {
 468                 struct mmc_command cmd;
 469                 u32 readcmd, writecmd, status = 0;
 470
 471                 memset(&brq, 0, sizeof(struct mmc_blk_request));
 472                 brq.mrq.cmd = &brq.cmd;
 473                 brq.mrq.data = &brq.data;
 474
 475                 brq.cmd.arg = blk_rq_pos(req);
 476                 if (!mmc_card_blockaddr(card))
 477                         brq.cmd.arg <<= 9;
 478                 brq.cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 479                 brq.data.blksz = 512;
 480                 brq.stop.opcode = MMC_STOP_TRANSMISSION;
 481                 brq.stop.arg = 0;
 482                 brq.stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
 483                 brq.data.blocks = blk_rq_sectors(req);
 484
 485                 /*
 486                  * The block layer doesn't support all sector count
 487                  * restrictions, so we need to be prepared for too big
 488                  * requests.
 489                  */
 490                 if (brq.data.blocks > card->host->max_blk_count)
 491                         brq.data.blocks = card->host->max_blk_count;
 492
 493                 /*
 494                  * After a read error, we redo the request one sector at a time
 495                  * in order to accurately determine which sectors can be read
 496                  * successfully.
 497                  */
 498                 if (disable_multi && brq.data.blocks > 1)
 499                         brq.data.blocks = 1;
 500
 501                 if (brq.data.blocks > 1 || do_rel_wr) {
 502                         /* SPI multiblock writes terminate using a special
 503                          * token, not a STOP_TRANSMISSION request. Reliable
 504                          * writes use SET_BLOCK_COUNT and do not use a
 505                          * STOP_TRANSMISSION request either.
 506                          */
 507                         if ((!mmc_host_is_spi(card->host) && !do_rel_wr) ||
 508                             rq_data_dir(req) == READ)
 509                                 brq.mrq.stop = &brq.stop;
 510                         readcmd = MMC_READ_MULTIPLE_BLOCK;
 511                         writecmd = MMC_WRITE_MULTIPLE_BLOCK;
 512                 } else {
 513                         brq.mrq.stop = NULL;
 514                         readcmd = MMC_READ_SINGLE_BLOCK;
 515                         writecmd = MMC_WRITE_BLOCK;
 516                 }
 517                 if (rq_data_dir(req) == READ) {
 518                         brq.cmd.opcode = readcmd;
 519                         brq.data.flags |= MMC_DATA_READ;
 520                 } else {
 521                         brq.cmd.opcode = writecmd;
 522                         brq.data.flags |= MMC_DATA_WRITE;
 523                 }
 524
 525                 if (do_rel_wr && mmc_apply_rel_rw(&brq, card, req))
 526                         goto cmd_err;
 527
 528                 mmc_set_data_timeout(&brq.data, card);
 529
 530                 brq.data.sg = mq->sg;
 531                 brq.data.sg_len = mmc_queue_map_sg(mq);
 532
 533                 /*
 534                  * Adjust the sg list so it is the same size as the
 535                  * request.
 536                  */
 537                 if (brq.data.blocks != blk_rq_sectors(req)) {
 538                         int i, data_size = brq.data.blocks << 9;
 539                         struct scatterlist *sg;
 540
 541                         for_each_sg(brq.data.sg, sg, brq.data.sg_len, i) {
 542                                 data_size -= sg->length;
 543                                 if (data_size <= 0) {
 544                                         sg->length += data_size;
 545                                         i++;
 546                                         break;
 547                                 }
 548                         }
 549                         brq.data.sg_len = i;
 550                 }
 551
 552                 mmc_queue_bounce_pre(mq);
 553
 554                 mmc_wait_for_req(card->host, &brq.mrq);
 555
 556                 mmc_queue_bounce_post(mq);
 557
 558                 /*
 559                  * Check for errors here, but don't jump to cmd_err
 560                  * until later as we need to wait for the card to leave
 561                  * programming mode even when things go wrong.
 562                  */
 563                 if (brq.cmd.error || brq.data.error || brq.stop.error) {
 564                         if (brq.data.blocks > 1 && rq_data_dir(req) == READ) {
 565                                 /* Redo read one sector at a time */
 566                                 printk(KERN_WARNING "%s: retrying using single "
 567                                        "block read\n", req->rq_disk->disk_name);
 568                                 disable_multi = 1;
 569                                 continue;
 570                         }
 571                         status = get_card_status(card, req);
 572                 }
 573
 574                 if (brq.cmd.error) {
 575                         printk(KERN_ERR "%s: error %d sending read/write "
 576                                "command, response %#x, card status %#x\n",
 577                                req->rq_disk->disk_name, brq.cmd.error,
 578                                brq.cmd.resp[0], status);
 579                 }
 580
 581                 if (brq.data.error) {
 582                         if (brq.data.error == -ETIMEDOUT && brq.mrq.stop)
 583                                 /* 'Stop' response contains card status */
 584                                 status = brq.mrq.stop->resp[0];
 585                         printk(KERN_ERR "%s: error %d transferring data,"
 586                                " sector %u, nr %u, card status %#x\n",
 587                                req->rq_disk->disk_name, brq.data.error,
 588                                (unsigned)blk_rq_pos(req),
 589                                (unsigned)blk_rq_sectors(req), status);
 590                 }
 591
 592                 if (brq.stop.error) {
 593                         printk(KERN_ERR "%s: error %d sending stop command, "
 594                                "response %#x, card status %#x\n",
 595                                req->rq_disk->disk_name, brq.stop.error,
 596                                brq.stop.resp[0], status);
 597                 }
 598
 599                 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
 600                         do {
 601                                 int err;
 602
 603                                 cmd.opcode = MMC_SEND_STATUS;
 604                                 cmd.arg = card->rca << 16;
 605                                 cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
 606                                 err = mmc_wait_for_cmd(card->host, &cmd, 5);
 607                                 if (err) {
 608                                         printk(KERN_ERR "%s: error %d requesting status\n",
 609                                                req->rq_disk->disk_name, err);
 610                                         goto cmd_err;
 611                                 }
 612                                 /*
 613                                  * Some cards mishandle the status bits,
 614                                  * so make sure to check both the busy
 615                                  * indication and the card state.
 616                                  */
 617                         } while (!(cmd.resp[0] & R1_READY_FOR_DATA) ||
 618                                 (R1_CURRENT_STATE(cmd.resp[0]) == 7));
 619
 620 #if 0
 621                         if (cmd.resp[0] & ~0x00000900)
 622                                 printk(KERN_ERR "%s: status = %08x\n",
 623                                        req->rq_disk->disk_name, cmd.resp[0]);
 624                         if (mmc_decode_status(cmd.resp))
 625                                 goto cmd_err;
 626 #endif
 627                 }
 628
 629                 if (brq.cmd.error || brq.stop.error || brq.data.error) {
 630                         if (rq_data_dir(req) == READ) {
 631                                 /*
 632                                  * After an error, we redo I/O one sector at a
 633                                  * time, so we only reach here after trying to
 634                                  * read a single sector.
 635                                  */
 636                                 spin_lock_irq(&md->lock);
 637                                 ret = __blk_end_request(req, -EIO, brq.data.blksz);
 638                                 spin_unlock_irq(&md->lock);
 639                                 continue;
 640                         }
 641                         goto cmd_err;
 642                 }
 643
 644                 /*
 645                  * A block was successfully transferred.
 646                  */
 647                 spin_lock_irq(&md->lock);
 648                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 649                 spin_unlock_irq(&md->lock);
 650         } while (ret);
 651
 652         return 1;
 653
 654  cmd_err:
 655         /*
 656          * If this is an SD card and we're writing, we can first
 657          * mark the known good sectors as ok.
 658          *
 659          * If the card is not SD, we can still ok written sectors
 660          * as reported by the controller (which might be less than
 661          * the real number of written sectors, but never more).
 662          */
 663         if (mmc_card_sd(card)) {
 664                 u32 blocks;
 665
 666                 blocks = mmc_sd_num_wr_blocks(card);
 667                 if (blocks != (u32)-1) {
 668                         spin_lock_irq(&md->lock);
 669                         ret = __blk_end_request(req, 0, blocks << 9);
 670                         spin_unlock_irq(&md->lock);
 671                 }
 672         } else {
 673                 spin_lock_irq(&md->lock);
 674                 ret = __blk_end_request(req, 0, brq.data.bytes_xfered);
 675                 spin_unlock_irq(&md->lock);
 676         }
 677
 678         spin_lock_irq(&md->lock);
 679         while (ret)
 680                 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
 681         spin_unlock_irq(&md->lock);
 682
 683         return 0;
 684 }
 685
 686 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 687 {
 688         int ret;
 689         struct mmc_blk_data *md = mq->data;
 690         struct mmc_card *card = md->queue.card;
 691
 692         mmc_claim_host(card->host);
 693         ret = mmc_blk_part_switch(card, md);
 694         if (ret) {
 695                 ret = 0;
 696                 goto out;
 697         }
 698
 699         if (req->cmd_flags & REQ_DISCARD) {
 700                 if (req->cmd_flags & REQ_SECURE)
 701                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
 702                 else
 703                         ret = mmc_blk_issue_discard_rq(mq, req);
 704         } else if (req->cmd_flags & REQ_FLUSH) {
 705                 ret = mmc_blk_issue_flush(mq, req);
 706         } else {
 707                 ret = mmc_blk_issue_rw_rq(mq, req);
 708         }
 709
 710 out:
 711         mmc_release_host(card->host);
 712         return ret;
 713 }
 714
 715 static inline int mmc_blk_readonly(struct mmc_card *card)
 716 {
 717         return mmc_card_readonly(card) ||
 718                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
 719 }
 720
 721 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
 722                                               struct device *parent,
 723                                               sector_t size,
 724                                               bool default_ro,
 725                                               const char *subname)
 726 {
 727         struct mmc_blk_data *md;
 728         int devidx, ret;
 729
 730         devidx = find_first_zero_bit(dev_use, max_devices);
 731         if (devidx >= max_devices)
 732                 return ERR_PTR(-ENOSPC);
 733         __set_bit(devidx, dev_use);
 734
 735         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
 736         if (!md) {
 737                 ret = -ENOMEM;
 738                 goto out;
 739         }
 740
 741         /*
 742          * Set the read-only status based on the supported commands
 743          * and the write protect switch.
 744          */
 745         md->read_only = mmc_blk_readonly(card);
 746
 747         md->disk = alloc_disk(perdev_minors);
 748         if (md->disk == NULL) {
 749                 ret = -ENOMEM;
 750                 goto err_kfree;
 751         }
 752
 753         spin_lock_init(&md->lock);
 754         INIT_LIST_HEAD(&md->part);
 755         md->usage = 1;
 756
 757         ret = mmc_init_queue(&md->queue, card, &md->lock);
 758         if (ret)
 759                 goto err_putdisk;
 760
 761         md->queue.issue_fn = mmc_blk_issue_rq;
 762         md->queue.data = md;
 763
 764         md->disk->major = MMC_BLOCK_MAJOR;
 765         md->disk->first_minor = devidx * perdev_minors;
 766         md->disk->fops = &mmc_bdops;
 767         md->disk->private_data = md;
 768         md->disk->queue = md->queue.queue;
 769         md->disk->driverfs_dev = parent;
 770         set_disk_ro(md->disk, md->read_only || default_ro);
 771         if (REL_WRITES_SUPPORTED(card))
 772                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
 773
 774         /*
 775          * As discussed on lkml, GENHD_FL_REMOVABLE should:
 776          *
 777          * - be set for removable media with permanent block devices
 778          * - be unset for removable block devices with permanent media
 779          *
 780          * Since MMC block devices clearly fall under the second
 781          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
 782          * should use the block device creation/destruction hotplug
 783          * messages to tell when the card is present.
 784          */
 785
 786         if (subname)
 787                 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
 788                          "mmcblk%d%s",
 789                          mmc_get_devidx(dev_to_disk(parent)), subname);
 790         else
 791                 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
 792                          "mmcblk%d", devidx);
 793
 794         blk_queue_logical_block_size(md->queue.queue, 512);
 795         set_capacity(md->disk, size);
 796         return md;
 797
 798  err_putdisk:
 799         put_disk(md->disk);
 800  err_kfree:
 801         kfree(md);
 802  out:
 803         return ERR_PTR(ret);
 804 }
 805
 806 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
 807 {
 808         sector_t size;
 809         struct mmc_blk_data *md;
 810
 811         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
 812                 /*
 813                  * The EXT_CSD sector count is in number or 512 byte
 814                  * sectors.
 815                  */
 816                 size = card->ext_csd.sectors;
 817         } else {
 818                 /*
 819                  * The CSD capacity field is in units of read_blkbits.
 820                  * set_capacity takes units of 512 bytes.
 821                  */
 822                 size = card->csd.capacity << (card->csd.read_blkbits - 9);
 823         }
 824
 825         md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL);
 826         return md;
 827 }
 828
 829 static int mmc_blk_alloc_part(struct mmc_card *card,
 830                               struct mmc_blk_data *md,
 831                               unsigned int part_type,
 832                               sector_t size,
 833                               bool default_ro,
 834                               const char *subname)
 835 {
 836         char cap_str[10];
 837         struct mmc_blk_data *part_md;
 838
 839         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
 840                                     subname);
 841         if (IS_ERR(part_md))
 842                 return PTR_ERR(part_md);
 843         part_md->part_type = part_type;
 844         list_add(&part_md->part, &md->part);
 845
 846         string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
 847                         cap_str, sizeof(cap_str));
 848         printk(KERN_INFO "%s: %s %s partition %u %s\n",
 849                part_md->disk->disk_name, mmc_card_id(card),
 850                mmc_card_name(card), part_md->part_type, cap_str);
 851         return 0;
 852 }
 853
 854 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
 855 {
 856         int ret = 0;
 857
 858         if (!mmc_card_mmc(card))
 859                 return 0;
 860
 861         if (card->ext_csd.boot_size) {
 862                 ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT0,
 863                                          card->ext_csd.boot_size >> 9,
 864                                          true,
 865                                          "boot0");
 866                 if (ret)
 867                         return ret;
 868                 ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT1,
 869                                          card->ext_csd.boot_size >> 9,
 870                                          true,
 871                                          "boot1");
 872                 if (ret)
 873                         return ret;
 874         }
 875
 876         return ret;
 877 }
 878
 879 static int
 880 mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card)
 881 {
 882         int err;
 883
 884         mmc_claim_host(card->host);
 885         err = mmc_set_blocklen(card, 512);
 886         mmc_release_host(card->host);
 887
 888         if (err) {
 889                 printk(KERN_ERR "%s: unable to set block size to 512: %d\n",
 890                         md->disk->disk_name, err);
 891                 return -EINVAL;
 892         }
 893
 894         return 0;
 895 }
 896
 897 static void mmc_blk_remove_req(struct mmc_blk_data *md)
 898 {
 899         if (md) {
 900                 if (md->disk->flags & GENHD_FL_UP) {
 901                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
 902
 903                         /* Stop new requests from getting into the queue */
 904                         del_gendisk(md->disk);
 905                 }
 906
 907                 /* Then flush out any already in there */
 908                 mmc_cleanup_queue(&md->queue);
 909                 mmc_blk_put(md);
 910         }
 911 }
 912
 913 static void mmc_blk_remove_parts(struct mmc_card *card,
 914                                  struct mmc_blk_data *md)
 915 {
 916         struct list_head *pos, *q;
 917         struct mmc_blk_data *part_md;
 918
 919         list_for_each_safe(pos, q, &md->part) {
 920                 part_md = list_entry(pos, struct mmc_blk_data, part);
 921                 list_del(pos);
 922                 mmc_blk_remove_req(part_md);
 923         }
 924 }
 925
 926 static int mmc_add_disk(struct mmc_blk_data *md)
 927 {
 928         int ret;
 929
 930         add_disk(md->disk);
 931         md->force_ro.show = force_ro_show;
 932         md->force_ro.store = force_ro_store;
 933         md->force_ro.attr.name = "force_ro";
 934         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
 935         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
 936         if (ret)
 937                 del_gendisk(md->disk);
 938
 939         return ret;
 940 }
 941
 942 static int mmc_blk_probe(struct mmc_card *card)
 943 {
 944         struct mmc_blk_data *md, *part_md;
 945         int err;
 946         char cap_str[10];
 947
 948         /*
 949          * Check that the card supports the command class(es) we need.
 950          */
 951         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
 952                 return -ENODEV;
 953
 954         md = mmc_blk_alloc(card);
 955         if (IS_ERR(md))
 956                 return PTR_ERR(md);
 957
 958         err = mmc_blk_set_blksize(md, card);
 959         if (err)
 960                 goto out;
 961
 962         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
 963                         cap_str, sizeof(cap_str));
 964         printk(KERN_INFO "%s: %s %s %s %s\n",
 965                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
 966                 cap_str, md->read_only ? "(ro)" : "");
 967
 968         if (mmc_blk_alloc_parts(card, md))
 969                 goto out;
 970
 971         mmc_set_drvdata(card, md);
 972         if (mmc_add_disk(md))
 973                 goto out;
 974
 975         list_for_each_entry(part_md, &md->part, part) {
 976                 if (mmc_add_disk(part_md))
 977                         goto out;
 978         }
 979         return 0;
 980
 981  out:
 982         mmc_blk_remove_parts(card, md);
 983         mmc_blk_remove_req(md);
 984         return err;
 985 }
 986
 987 static void mmc_blk_remove(struct mmc_card *card)
 988 {
 989         struct mmc_blk_data *md = mmc_get_drvdata(card);
 990
 991         mmc_blk_remove_parts(card, md);
 992         mmc_blk_remove_req(md);
 993         mmc_set_drvdata(card, NULL);
 994 }
 995
 996 #ifdef CONFIG_PM
 997 static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state)
 998 {
 999         struct mmc_blk_data *part_md;
1000         struct mmc_blk_data *md = mmc_get_drvdata(card);
1001
1002         if (md) {
1003                 mmc_queue_suspend(&md->queue);
1004                 list_for_each_entry(part_md, &md->part, part) {
1005                         mmc_queue_suspend(&part_md->queue);
1006                 }
1007         }
1008         return 0;
1009 }
1010
1011 static int mmc_blk_resume(struct mmc_card *card)
1012 {
1013         struct mmc_blk_data *part_md;
1014         struct mmc_blk_data *md = mmc_get_drvdata(card);
1015
1016         if (md) {
1017                 mmc_blk_set_blksize(md, card);
1018
1019                 /*
1020                  * Resume involves the card going into idle state,
1021                  * so current partition is always the main one.
1022                  */
1023                 md->part_curr = md->part_type;
1024                 mmc_queue_resume(&md->queue);
1025                 list_for_each_entry(part_md, &md->part, part) {
1026                         mmc_queue_resume(&part_md->queue);
1027                 }
1028         }
1029         return 0;
1030 }
1031 #else
1032 #define mmc_blk_suspend NULL
1033 #define mmc_blk_resume  NULL
1034 #endif
1035
1036 static struct mmc_driver mmc_driver = {
1037         .drv            = {
1038                 .name   = "mmcblk",
1039         },
1040         .probe          = mmc_blk_probe,
1041         .remove         = mmc_blk_remove,
1042         .suspend        = mmc_blk_suspend,
1043         .resume         = mmc_blk_resume,
1044 };
1045
1046 static int __init mmc_blk_init(void)
1047 {
1048         int res;
1049
1050         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
1051                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
1052
1053         max_devices = 256 / perdev_minors;
1054
1055         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
1056         if (res)
1057                 goto out;
1058
1059         res = mmc_register_driver(&mmc_driver);
1060         if (res)
1061                 goto out2;
1062
1063         return 0;
1064  out2:
1065         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1066  out:
1067         return res;
1068 }
1069
1070 static void __exit mmc_blk_exit(void)
1071 {
1072         mmc_unregister_driver(&mmc_driver);
1073         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1074 }
1075
1076 module_init(mmc_blk_init);
1077 module_exit(mmc_blk_exit);
1078
1079 MODULE_LICENSE("GPL");
1080 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
1081