block.c revision 65299a3b788bd274bed92f9fa3232082c9f3ea70
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 38#include <linux/mmc/ioctl.h> 39#include <linux/mmc/card.h> 40#include <linux/mmc/host.h> 41#include <linux/mmc/mmc.h> 42#include <linux/mmc/sd.h> 43 44#include <asm/system.h> 45#include <asm/uaccess.h> 46 47#include "queue.h" 48 49MODULE_ALIAS("mmc:block"); 50#ifdef MODULE_PARAM_PREFIX 51#undef MODULE_PARAM_PREFIX 52#endif 53#define MODULE_PARAM_PREFIX "mmcblk." 54 55#define INAND_CMD38_ARG_EXT_CSD 113 56#define INAND_CMD38_ARG_ERASE 0x00 57#define INAND_CMD38_ARG_TRIM 0x01 58#define INAND_CMD38_ARG_SECERASE 0x80 59#define INAND_CMD38_ARG_SECTRIM1 0x81 60#define INAND_CMD38_ARG_SECTRIM2 0x88 61 62static DEFINE_MUTEX(block_mutex); 63 64/* 65 * The defaults come from config options but can be overriden by module 66 * or bootarg options. 67 */ 68static int perdev_minors = CONFIG_MMC_BLOCK_MINORS; 69 70/* 71 * We've only got one major, so number of mmcblk devices is 72 * limited to 256 / number of minors per device. 73 */ 74static int max_devices; 75 76/* 256 minors, so at most 256 separate devices */ 77static DECLARE_BITMAP(dev_use, 256); 78static DECLARE_BITMAP(name_use, 256); 79 80/* 81 * There is one mmc_blk_data per slot. 82 */ 83struct mmc_blk_data { 84 spinlock_t lock; 85 struct gendisk *disk; 86 struct mmc_queue queue; 87 struct list_head part; 88 89 unsigned int flags; 90#define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */ 91#define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */ 92 93 unsigned int usage; 94 unsigned int read_only; 95 unsigned int part_type; 96 unsigned int name_idx; 97 98 /* 99 * Only set in main mmc_blk_data associated 100 * with mmc_card with mmc_set_drvdata, and keeps 101 * track of the current selected device partition. 102 */ 103 unsigned int part_curr; 104 struct device_attribute force_ro; 105}; 106 107static DEFINE_MUTEX(open_lock); 108 109enum mmc_blk_status { 110 MMC_BLK_SUCCESS = 0, 111 MMC_BLK_PARTIAL, 112 MMC_BLK_RETRY, 113 MMC_BLK_RETRY_SINGLE, 114 MMC_BLK_DATA_ERR, 115 MMC_BLK_CMD_ERR, 116 MMC_BLK_ABORT, 117}; 118 119module_param(perdev_minors, int, 0444); 120MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device"); 121 122static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) 123{ 124 struct mmc_blk_data *md; 125 126 mutex_lock(&open_lock); 127 md = disk->private_data; 128 if (md && md->usage == 0) 129 md = NULL; 130 if (md) 131 md->usage++; 132 mutex_unlock(&open_lock); 133 134 return md; 135} 136 137static inline int mmc_get_devidx(struct gendisk *disk) 138{ 139 int devmaj = MAJOR(disk_devt(disk)); 140 int devidx = MINOR(disk_devt(disk)) / perdev_minors; 141 142 if (!devmaj) 143 devidx = disk->first_minor / perdev_minors; 144 return devidx; 145} 146 147static void mmc_blk_put(struct mmc_blk_data *md) 148{ 149 mutex_lock(&open_lock); 150 md->usage--; 151 if (md->usage == 0) { 152 int devidx = mmc_get_devidx(md->disk); 153 blk_cleanup_queue(md->queue.queue); 154 155 __clear_bit(devidx, dev_use); 156 157 put_disk(md->disk); 158 kfree(md); 159 } 160 mutex_unlock(&open_lock); 161} 162 163static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr, 164 char *buf) 165{ 166 int ret; 167 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev)); 168 169 ret = snprintf(buf, PAGE_SIZE, "%d", 170 get_disk_ro(dev_to_disk(dev)) ^ 171 md->read_only); 172 mmc_blk_put(md); 173 return ret; 174} 175 176static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr, 177 const char *buf, size_t count) 178{ 179 int ret; 180 char *end; 181 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev)); 182 unsigned long set = simple_strtoul(buf, &end, 0); 183 if (end == buf) { 184 ret = -EINVAL; 185 goto out; 186 } 187 188 set_disk_ro(dev_to_disk(dev), set || md->read_only); 189 ret = count; 190out: 191 mmc_blk_put(md); 192 return ret; 193} 194 195static int mmc_blk_open(struct block_device *bdev, fmode_t mode) 196{ 197 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk); 198 int ret = -ENXIO; 199 200 mutex_lock(&block_mutex); 201 if (md) { 202 if (md->usage == 2) 203 check_disk_change(bdev); 204 ret = 0; 205 206 if ((mode & FMODE_WRITE) && md->read_only) { 207 mmc_blk_put(md); 208 ret = -EROFS; 209 } 210 } 211 mutex_unlock(&block_mutex); 212 213 return ret; 214} 215 216static int mmc_blk_release(struct gendisk *disk, fmode_t mode) 217{ 218 struct mmc_blk_data *md = disk->private_data; 219 220 mutex_lock(&block_mutex); 221 mmc_blk_put(md); 222 mutex_unlock(&block_mutex); 223 return 0; 224} 225 226static int 227mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo) 228{ 229 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16); 230 geo->heads = 4; 231 geo->sectors = 16; 232 return 0; 233} 234 235struct mmc_blk_ioc_data { 236 struct mmc_ioc_cmd ic; 237 unsigned char *buf; 238 u64 buf_bytes; 239}; 240 241static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user( 242 struct mmc_ioc_cmd __user *user) 243{ 244 struct mmc_blk_ioc_data *idata; 245 int err; 246 247 idata = kzalloc(sizeof(*idata), GFP_KERNEL); 248 if (!idata) { 249 err = -ENOMEM; 250 goto out; 251 } 252 253 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) { 254 err = -EFAULT; 255 goto idata_err; 256 } 257 258 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks; 259 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) { 260 err = -EOVERFLOW; 261 goto idata_err; 262 } 263 264 idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL); 265 if (!idata->buf) { 266 err = -ENOMEM; 267 goto idata_err; 268 } 269 270 if (copy_from_user(idata->buf, (void __user *)(unsigned long) 271 idata->ic.data_ptr, idata->buf_bytes)) { 272 err = -EFAULT; 273 goto copy_err; 274 } 275 276 return idata; 277 278copy_err: 279 kfree(idata->buf); 280idata_err: 281 kfree(idata); 282out: 283 return ERR_PTR(err); 284} 285 286static int mmc_blk_ioctl_cmd(struct block_device *bdev, 287 struct mmc_ioc_cmd __user *ic_ptr) 288{ 289 struct mmc_blk_ioc_data *idata; 290 struct mmc_blk_data *md; 291 struct mmc_card *card; 292 struct mmc_command cmd = {0}; 293 struct mmc_data data = {0}; 294 struct mmc_request mrq = {0}; 295 struct scatterlist sg; 296 int err; 297 298 /* 299 * The caller must have CAP_SYS_RAWIO, and must be calling this on the 300 * whole block device, not on a partition. This prevents overspray 301 * between sibling partitions. 302 */ 303 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains)) 304 return -EPERM; 305 306 idata = mmc_blk_ioctl_copy_from_user(ic_ptr); 307 if (IS_ERR(idata)) 308 return PTR_ERR(idata); 309 310 cmd.opcode = idata->ic.opcode; 311 cmd.arg = idata->ic.arg; 312 cmd.flags = idata->ic.flags; 313 314 data.sg = &sg; 315 data.sg_len = 1; 316 data.blksz = idata->ic.blksz; 317 data.blocks = idata->ic.blocks; 318 319 sg_init_one(data.sg, idata->buf, idata->buf_bytes); 320 321 if (idata->ic.write_flag) 322 data.flags = MMC_DATA_WRITE; 323 else 324 data.flags = MMC_DATA_READ; 325 326 mrq.cmd = &cmd; 327 mrq.data = &data; 328 329 md = mmc_blk_get(bdev->bd_disk); 330 if (!md) { 331 err = -EINVAL; 332 goto cmd_done; 333 } 334 335 card = md->queue.card; 336 if (IS_ERR(card)) { 337 err = PTR_ERR(card); 338 goto cmd_done; 339 } 340 341 mmc_claim_host(card->host); 342 343 if (idata->ic.is_acmd) { 344 err = mmc_app_cmd(card->host, card); 345 if (err) 346 goto cmd_rel_host; 347 } 348 349 /* data.flags must already be set before doing this. */ 350 mmc_set_data_timeout(&data, card); 351 /* Allow overriding the timeout_ns for empirical tuning. */ 352 if (idata->ic.data_timeout_ns) 353 data.timeout_ns = idata->ic.data_timeout_ns; 354 355 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) { 356 /* 357 * Pretend this is a data transfer and rely on the host driver 358 * to compute timeout. When all host drivers support 359 * cmd.cmd_timeout for R1B, this can be changed to: 360 * 361 * mrq.data = NULL; 362 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms; 363 */ 364 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000; 365 } 366 367 mmc_wait_for_req(card->host, &mrq); 368 369 if (cmd.error) { 370 dev_err(mmc_dev(card->host), "%s: cmd error %d\n", 371 __func__, cmd.error); 372 err = cmd.error; 373 goto cmd_rel_host; 374 } 375 if (data.error) { 376 dev_err(mmc_dev(card->host), "%s: data error %d\n", 377 __func__, data.error); 378 err = data.error; 379 goto cmd_rel_host; 380 } 381 382 /* 383 * According to the SD specs, some commands require a delay after 384 * issuing the command. 385 */ 386 if (idata->ic.postsleep_min_us) 387 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us); 388 389 if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) { 390 err = -EFAULT; 391 goto cmd_rel_host; 392 } 393 394 if (!idata->ic.write_flag) { 395 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr, 396 idata->buf, idata->buf_bytes)) { 397 err = -EFAULT; 398 goto cmd_rel_host; 399 } 400 } 401 402cmd_rel_host: 403 mmc_release_host(card->host); 404 405cmd_done: 406 mmc_blk_put(md); 407 kfree(idata->buf); 408 kfree(idata); 409 return err; 410} 411 412static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode, 413 unsigned int cmd, unsigned long arg) 414{ 415 int ret = -EINVAL; 416 if (cmd == MMC_IOC_CMD) 417 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg); 418 return ret; 419} 420 421#ifdef CONFIG_COMPAT 422static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode, 423 unsigned int cmd, unsigned long arg) 424{ 425 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg)); 426} 427#endif 428 429static const struct block_device_operations mmc_bdops = { 430 .open = mmc_blk_open, 431 .release = mmc_blk_release, 432 .getgeo = mmc_blk_getgeo, 433 .owner = THIS_MODULE, 434 .ioctl = mmc_blk_ioctl, 435#ifdef CONFIG_COMPAT 436 .compat_ioctl = mmc_blk_compat_ioctl, 437#endif 438}; 439 440static inline int mmc_blk_part_switch(struct mmc_card *card, 441 struct mmc_blk_data *md) 442{ 443 int ret; 444 struct mmc_blk_data *main_md = mmc_get_drvdata(card); 445 if (main_md->part_curr == md->part_type) 446 return 0; 447 448 if (mmc_card_mmc(card)) { 449 card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK; 450 card->ext_csd.part_config |= md->part_type; 451 452 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 453 EXT_CSD_PART_CONFIG, card->ext_csd.part_config, 454 card->ext_csd.part_time); 455 if (ret) 456 return ret; 457} 458 459 main_md->part_curr = md->part_type; 460 return 0; 461} 462 463static u32 mmc_sd_num_wr_blocks(struct mmc_card *card) 464{ 465 int err; 466 u32 result; 467 __be32 *blocks; 468 469 struct mmc_request mrq = {0}; 470 struct mmc_command cmd = {0}; 471 struct mmc_data data = {0}; 472 unsigned int timeout_us; 473 474 struct scatterlist sg; 475 476 cmd.opcode = MMC_APP_CMD; 477 cmd.arg = card->rca << 16; 478 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC; 479 480 err = mmc_wait_for_cmd(card->host, &cmd, 0); 481 if (err) 482 return (u32)-1; 483 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD)) 484 return (u32)-1; 485 486 memset(&cmd, 0, sizeof(struct mmc_command)); 487 488 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS; 489 cmd.arg = 0; 490 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 491 492 data.timeout_ns = card->csd.tacc_ns * 100; 493 data.timeout_clks = card->csd.tacc_clks * 100; 494 495 timeout_us = data.timeout_ns / 1000; 496 timeout_us += data.timeout_clks * 1000 / 497 (card->host->ios.clock / 1000); 498 499 if (timeout_us > 100000) { 500 data.timeout_ns = 100000000; 501 data.timeout_clks = 0; 502 } 503 504 data.blksz = 4; 505 data.blocks = 1; 506 data.flags = MMC_DATA_READ; 507 data.sg = &sg; 508 data.sg_len = 1; 509 510 mrq.cmd = &cmd; 511 mrq.data = &data; 512 513 blocks = kmalloc(4, GFP_KERNEL); 514 if (!blocks) 515 return (u32)-1; 516 517 sg_init_one(&sg, blocks, 4); 518 519 mmc_wait_for_req(card->host, &mrq); 520 521 result = ntohl(*blocks); 522 kfree(blocks); 523 524 if (cmd.error || data.error) 525 result = (u32)-1; 526 527 return result; 528} 529 530static int send_stop(struct mmc_card *card, u32 *status) 531{ 532 struct mmc_command cmd = {0}; 533 int err; 534 535 cmd.opcode = MMC_STOP_TRANSMISSION; 536 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; 537 err = mmc_wait_for_cmd(card->host, &cmd, 5); 538 if (err == 0) 539 *status = cmd.resp[0]; 540 return err; 541} 542 543static int get_card_status(struct mmc_card *card, u32 *status, int retries) 544{ 545 struct mmc_command cmd = {0}; 546 int err; 547 548 cmd.opcode = MMC_SEND_STATUS; 549 if (!mmc_host_is_spi(card->host)) 550 cmd.arg = card->rca << 16; 551 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC; 552 err = mmc_wait_for_cmd(card->host, &cmd, retries); 553 if (err == 0) 554 *status = cmd.resp[0]; 555 return err; 556} 557 558#define ERR_RETRY 2 559#define ERR_ABORT 1 560#define ERR_CONTINUE 0 561 562static int mmc_blk_cmd_error(struct request *req, const char *name, int error, 563 bool status_valid, u32 status) 564{ 565 switch (error) { 566 case -EILSEQ: 567 /* response crc error, retry the r/w cmd */ 568 pr_err("%s: %s sending %s command, card status %#x\n", 569 req->rq_disk->disk_name, "response CRC error", 570 name, status); 571 return ERR_RETRY; 572 573 case -ETIMEDOUT: 574 pr_err("%s: %s sending %s command, card status %#x\n", 575 req->rq_disk->disk_name, "timed out", name, status); 576 577 /* If the status cmd initially failed, retry the r/w cmd */ 578 if (!status_valid) 579 return ERR_RETRY; 580 581 /* 582 * If it was a r/w cmd crc error, or illegal command 583 * (eg, issued in wrong state) then retry - we should 584 * have corrected the state problem above. 585 */ 586 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) 587 return ERR_RETRY; 588 589 /* Otherwise abort the command */ 590 return ERR_ABORT; 591 592 default: 593 /* We don't understand the error code the driver gave us */ 594 pr_err("%s: unknown error %d sending read/write command, card status %#x\n", 595 req->rq_disk->disk_name, error, status); 596 return ERR_ABORT; 597 } 598} 599 600/* 601 * Initial r/w and stop cmd error recovery. 602 * We don't know whether the card received the r/w cmd or not, so try to 603 * restore things back to a sane state. Essentially, we do this as follows: 604 * - Obtain card status. If the first attempt to obtain card status fails, 605 * the status word will reflect the failed status cmd, not the failed 606 * r/w cmd. If we fail to obtain card status, it suggests we can no 607 * longer communicate with the card. 608 * - Check the card state. If the card received the cmd but there was a 609 * transient problem with the response, it might still be in a data transfer 610 * mode. Try to send it a stop command. If this fails, we can't recover. 611 * - If the r/w cmd failed due to a response CRC error, it was probably 612 * transient, so retry the cmd. 613 * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry. 614 * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or 615 * illegal cmd, retry. 616 * Otherwise we don't understand what happened, so abort. 617 */ 618static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req, 619 struct mmc_blk_request *brq) 620{ 621 bool prev_cmd_status_valid = true; 622 u32 status, stop_status = 0; 623 int err, retry; 624 625 /* 626 * Try to get card status which indicates both the card state 627 * and why there was no response. If the first attempt fails, 628 * we can't be sure the returned status is for the r/w command. 629 */ 630 for (retry = 2; retry >= 0; retry--) { 631 err = get_card_status(card, &status, 0); 632 if (!err) 633 break; 634 635 prev_cmd_status_valid = false; 636 pr_err("%s: error %d sending status command, %sing\n", 637 req->rq_disk->disk_name, err, retry ? "retry" : "abort"); 638 } 639 640 /* We couldn't get a response from the card. Give up. */ 641 if (err) 642 return ERR_ABORT; 643 644 /* 645 * Check the current card state. If it is in some data transfer 646 * mode, tell it to stop (and hopefully transition back to TRAN.) 647 */ 648 if (R1_CURRENT_STATE(status) == R1_STATE_DATA || 649 R1_CURRENT_STATE(status) == R1_STATE_RCV) { 650 err = send_stop(card, &stop_status); 651 if (err) 652 pr_err("%s: error %d sending stop command\n", 653 req->rq_disk->disk_name, err); 654 655 /* 656 * If the stop cmd also timed out, the card is probably 657 * not present, so abort. Other errors are bad news too. 658 */ 659 if (err) 660 return ERR_ABORT; 661 } 662 663 /* Check for set block count errors */ 664 if (brq->sbc.error) 665 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error, 666 prev_cmd_status_valid, status); 667 668 /* Check for r/w command errors */ 669 if (brq->cmd.error) 670 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error, 671 prev_cmd_status_valid, status); 672 673 /* Now for stop errors. These aren't fatal to the transfer. */ 674 pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n", 675 req->rq_disk->disk_name, brq->stop.error, 676 brq->cmd.resp[0], status); 677 678 /* 679 * Subsitute in our own stop status as this will give the error 680 * state which happened during the execution of the r/w command. 681 */ 682 if (stop_status) { 683 brq->stop.resp[0] = stop_status; 684 brq->stop.error = 0; 685 } 686 return ERR_CONTINUE; 687} 688 689static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req) 690{ 691 struct mmc_blk_data *md = mq->data; 692 struct mmc_card *card = md->queue.card; 693 unsigned int from, nr, arg; 694 int err = 0; 695 696 if (!mmc_can_erase(card)) { 697 err = -EOPNOTSUPP; 698 goto out; 699 } 700 701 from = blk_rq_pos(req); 702 nr = blk_rq_sectors(req); 703 704 if (mmc_can_trim(card)) 705 arg = MMC_TRIM_ARG; 706 else 707 arg = MMC_ERASE_ARG; 708 709 if (card->quirks & MMC_QUIRK_INAND_CMD38) { 710 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 711 INAND_CMD38_ARG_EXT_CSD, 712 arg == MMC_TRIM_ARG ? 713 INAND_CMD38_ARG_TRIM : 714 INAND_CMD38_ARG_ERASE, 715 0); 716 if (err) 717 goto out; 718 } 719 err = mmc_erase(card, from, nr, arg); 720out: 721 spin_lock_irq(&md->lock); 722 __blk_end_request(req, err, blk_rq_bytes(req)); 723 spin_unlock_irq(&md->lock); 724 725 return err ? 0 : 1; 726} 727 728static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq, 729 struct request *req) 730{ 731 struct mmc_blk_data *md = mq->data; 732 struct mmc_card *card = md->queue.card; 733 unsigned int from, nr, arg; 734 int err = 0; 735 736 if (!mmc_can_secure_erase_trim(card)) { 737 err = -EOPNOTSUPP; 738 goto out; 739 } 740 741 from = blk_rq_pos(req); 742 nr = blk_rq_sectors(req); 743 744 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr)) 745 arg = MMC_SECURE_TRIM1_ARG; 746 else 747 arg = MMC_SECURE_ERASE_ARG; 748 749 if (card->quirks & MMC_QUIRK_INAND_CMD38) { 750 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 751 INAND_CMD38_ARG_EXT_CSD, 752 arg == MMC_SECURE_TRIM1_ARG ? 753 INAND_CMD38_ARG_SECTRIM1 : 754 INAND_CMD38_ARG_SECERASE, 755 0); 756 if (err) 757 goto out; 758 } 759 err = mmc_erase(card, from, nr, arg); 760 if (!err && arg == MMC_SECURE_TRIM1_ARG) { 761 if (card->quirks & MMC_QUIRK_INAND_CMD38) { 762 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, 763 INAND_CMD38_ARG_EXT_CSD, 764 INAND_CMD38_ARG_SECTRIM2, 765 0); 766 if (err) 767 goto out; 768 } 769 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG); 770 } 771out: 772 spin_lock_irq(&md->lock); 773 __blk_end_request(req, err, blk_rq_bytes(req)); 774 spin_unlock_irq(&md->lock); 775 776 return err ? 0 : 1; 777} 778 779static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req) 780{ 781 struct mmc_blk_data *md = mq->data; 782 783 /* 784 * No-op, only service this because we need REQ_FUA for reliable 785 * writes. 786 */ 787 spin_lock_irq(&md->lock); 788 __blk_end_request_all(req, 0); 789 spin_unlock_irq(&md->lock); 790 791 return 1; 792} 793 794/* 795 * Reformat current write as a reliable write, supporting 796 * both legacy and the enhanced reliable write MMC cards. 797 * In each transfer we'll handle only as much as a single 798 * reliable write can handle, thus finish the request in 799 * partial completions. 800 */ 801static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq, 802 struct mmc_card *card, 803 struct request *req) 804{ 805 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) { 806 /* Legacy mode imposes restrictions on transfers. */ 807 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors)) 808 brq->data.blocks = 1; 809 810 if (brq->data.blocks > card->ext_csd.rel_sectors) 811 brq->data.blocks = card->ext_csd.rel_sectors; 812 else if (brq->data.blocks < card->ext_csd.rel_sectors) 813 brq->data.blocks = 1; 814 } 815} 816 817#define CMD_ERRORS \ 818 (R1_OUT_OF_RANGE | /* Command argument out of range */ \ 819 R1_ADDRESS_ERROR | /* Misaligned address */ \ 820 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\ 821 R1_WP_VIOLATION | /* Tried to write to protected block */ \ 822 R1_CC_ERROR | /* Card controller error */ \ 823 R1_ERROR) /* General/unknown error */ 824 825static int mmc_blk_err_check(struct mmc_card *card, 826 struct mmc_async_req *areq) 827{ 828 enum mmc_blk_status ret = MMC_BLK_SUCCESS; 829 struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req, 830 mmc_active); 831 struct mmc_blk_request *brq = &mq_mrq->brq; 832 struct request *req = mq_mrq->req; 833 834 /* 835 * sbc.error indicates a problem with the set block count 836 * command. No data will have been transferred. 837 * 838 * cmd.error indicates a problem with the r/w command. No 839 * data will have been transferred. 840 * 841 * stop.error indicates a problem with the stop command. Data 842 * may have been transferred, or may still be transferring. 843 */ 844 if (brq->sbc.error || brq->cmd.error || brq->stop.error) { 845 switch (mmc_blk_cmd_recovery(card, req, brq)) { 846 case ERR_RETRY: 847 return MMC_BLK_RETRY; 848 case ERR_ABORT: 849 return MMC_BLK_ABORT; 850 case ERR_CONTINUE: 851 break; 852 } 853 } 854 855 /* 856 * Check for errors relating to the execution of the 857 * initial command - such as address errors. No data 858 * has been transferred. 859 */ 860 if (brq->cmd.resp[0] & CMD_ERRORS) { 861 pr_err("%s: r/w command failed, status = %#x\n", 862 req->rq_disk->disk_name, brq->cmd.resp[0]); 863 return MMC_BLK_ABORT; 864 } 865 866 /* 867 * Everything else is either success, or a data error of some 868 * kind. If it was a write, we may have transitioned to 869 * program mode, which we have to wait for it to complete. 870 */ 871 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) { 872 u32 status; 873 do { 874 int err = get_card_status(card, &status, 5); 875 if (err) { 876 printk(KERN_ERR "%s: error %d requesting status\n", 877 req->rq_disk->disk_name, err); 878 return MMC_BLK_CMD_ERR; 879 } 880 /* 881 * Some cards mishandle the status bits, 882 * so make sure to check both the busy 883 * indication and the card state. 884 */ 885 } while (!(status & R1_READY_FOR_DATA) || 886 (R1_CURRENT_STATE(status) == R1_STATE_PRG)); 887 } 888 889 if (brq->data.error) { 890 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n", 891 req->rq_disk->disk_name, brq->data.error, 892 (unsigned)blk_rq_pos(req), 893 (unsigned)blk_rq_sectors(req), 894 brq->cmd.resp[0], brq->stop.resp[0]); 895 896 if (rq_data_dir(req) == READ) { 897 if (brq->data.blocks > 1) { 898 /* Redo read one sector at a time */ 899 pr_warning("%s: retrying using single block read\n", 900 req->rq_disk->disk_name); 901 return MMC_BLK_RETRY_SINGLE; 902 } 903 return MMC_BLK_DATA_ERR; 904 } else { 905 return MMC_BLK_CMD_ERR; 906 } 907 } 908 909 if (ret == MMC_BLK_SUCCESS && 910 blk_rq_bytes(req) != brq->data.bytes_xfered) 911 ret = MMC_BLK_PARTIAL; 912 913 return ret; 914} 915 916static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq, 917 struct mmc_card *card, 918 int disable_multi, 919 struct mmc_queue *mq) 920{ 921 u32 readcmd, writecmd; 922 struct mmc_blk_request *brq = &mqrq->brq; 923 struct request *req = mqrq->req; 924 struct mmc_blk_data *md = mq->data; 925 926 /* 927 * Reliable writes are used to implement Forced Unit Access and 928 * REQ_META accesses, and are supported only on MMCs. 929 * 930 * XXX: this really needs a good explanation of why REQ_META 931 * is treated special. 932 */ 933 bool do_rel_wr = ((req->cmd_flags & REQ_FUA) || 934 (req->cmd_flags & REQ_META)) && 935 (rq_data_dir(req) == WRITE) && 936 (md->flags & MMC_BLK_REL_WR); 937 938 memset(brq, 0, sizeof(struct mmc_blk_request)); 939 brq->mrq.cmd = &brq->cmd; 940 brq->mrq.data = &brq->data; 941 942 brq->cmd.arg = blk_rq_pos(req); 943 if (!mmc_card_blockaddr(card)) 944 brq->cmd.arg <<= 9; 945 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC; 946 brq->data.blksz = 512; 947 brq->stop.opcode = MMC_STOP_TRANSMISSION; 948 brq->stop.arg = 0; 949 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC; 950 brq->data.blocks = blk_rq_sectors(req); 951 952 /* 953 * The block layer doesn't support all sector count 954 * restrictions, so we need to be prepared for too big 955 * requests. 956 */ 957 if (brq->data.blocks > card->host->max_blk_count) 958 brq->data.blocks = card->host->max_blk_count; 959 960 /* 961 * After a read error, we redo the request one sector at a time 962 * in order to accurately determine which sectors can be read 963 * successfully. 964 */ 965 if (disable_multi && brq->data.blocks > 1) 966 brq->data.blocks = 1; 967 968 if (brq->data.blocks > 1 || do_rel_wr) { 969 /* SPI multiblock writes terminate using a special 970 * token, not a STOP_TRANSMISSION request. 971 */ 972 if (!mmc_host_is_spi(card->host) || 973 rq_data_dir(req) == READ) 974 brq->mrq.stop = &brq->stop; 975 readcmd = MMC_READ_MULTIPLE_BLOCK; 976 writecmd = MMC_WRITE_MULTIPLE_BLOCK; 977 } else { 978 brq->mrq.stop = NULL; 979 readcmd = MMC_READ_SINGLE_BLOCK; 980 writecmd = MMC_WRITE_BLOCK; 981 } 982 if (rq_data_dir(req) == READ) { 983 brq->cmd.opcode = readcmd; 984 brq->data.flags |= MMC_DATA_READ; 985 } else { 986 brq->cmd.opcode = writecmd; 987 brq->data.flags |= MMC_DATA_WRITE; 988 } 989 990 if (do_rel_wr) 991 mmc_apply_rel_rw(brq, card, req); 992 993 /* 994 * Pre-defined multi-block transfers are preferable to 995 * open ended-ones (and necessary for reliable writes). 996 * However, it is not sufficient to just send CMD23, 997 * and avoid the final CMD12, as on an error condition 998 * CMD12 (stop) needs to be sent anyway. This, coupled 999 * with Auto-CMD23 enhancements provided by some 1000 * hosts, means that the complexity of dealing 1001 * with this is best left to the host. If CMD23 is 1002 * supported by card and host, we'll fill sbc in and let 1003 * the host deal with handling it correctly. This means 1004 * that for hosts that don't expose MMC_CAP_CMD23, no 1005 * change of behavior will be observed. 1006 * 1007 * N.B: Some MMC cards experience perf degradation. 1008 * We'll avoid using CMD23-bounded multiblock writes for 1009 * these, while retaining features like reliable writes. 1010 */ 1011 1012 if ((md->flags & MMC_BLK_CMD23) && 1013 mmc_op_multi(brq->cmd.opcode) && 1014 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23))) { 1015 brq->sbc.opcode = MMC_SET_BLOCK_COUNT; 1016 brq->sbc.arg = brq->data.blocks | 1017 (do_rel_wr ? (1 << 31) : 0); 1018 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC; 1019 brq->mrq.sbc = &brq->sbc; 1020 } 1021 1022 mmc_set_data_timeout(&brq->data, card); 1023 1024 brq->data.sg = mqrq->sg; 1025 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq); 1026 1027 /* 1028 * Adjust the sg list so it is the same size as the 1029 * request. 1030 */ 1031 if (brq->data.blocks != blk_rq_sectors(req)) { 1032 int i, data_size = brq->data.blocks << 9; 1033 struct scatterlist *sg; 1034 1035 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) { 1036 data_size -= sg->length; 1037 if (data_size <= 0) { 1038 sg->length += data_size; 1039 i++; 1040 break; 1041 } 1042 } 1043 brq->data.sg_len = i; 1044 } 1045 1046 mqrq->mmc_active.mrq = &brq->mrq; 1047 mqrq->mmc_active.err_check = mmc_blk_err_check; 1048 1049 mmc_queue_bounce_pre(mqrq); 1050} 1051 1052static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc) 1053{ 1054 struct mmc_blk_data *md = mq->data; 1055 struct mmc_card *card = md->queue.card; 1056 struct mmc_blk_request *brq = &mq->mqrq_cur->brq; 1057 int ret = 1, disable_multi = 0, retry = 0; 1058 enum mmc_blk_status status; 1059 struct mmc_queue_req *mq_rq; 1060 struct request *req; 1061 struct mmc_async_req *areq; 1062 1063 if (!rqc && !mq->mqrq_prev->req) 1064 return 0; 1065 1066 do { 1067 if (rqc) { 1068 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq); 1069 areq = &mq->mqrq_cur->mmc_active; 1070 } else 1071 areq = NULL; 1072 areq = mmc_start_req(card->host, areq, (int *) &status); 1073 if (!areq) 1074 return 0; 1075 1076 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active); 1077 brq = &mq_rq->brq; 1078 req = mq_rq->req; 1079 mmc_queue_bounce_post(mq_rq); 1080 1081 switch (status) { 1082 case MMC_BLK_SUCCESS: 1083 case MMC_BLK_PARTIAL: 1084 /* 1085 * A block was successfully transferred. 1086 */ 1087 spin_lock_irq(&md->lock); 1088 ret = __blk_end_request(req, 0, 1089 brq->data.bytes_xfered); 1090 spin_unlock_irq(&md->lock); 1091 if (status == MMC_BLK_SUCCESS && ret) { 1092 /* 1093 * The blk_end_request has returned non zero 1094 * even though all data is transfered and no 1095 * erros returned by host. 1096 * If this happen it's a bug. 1097 */ 1098 printk(KERN_ERR "%s BUG rq_tot %d d_xfer %d\n", 1099 __func__, blk_rq_bytes(req), 1100 brq->data.bytes_xfered); 1101 rqc = NULL; 1102 goto cmd_abort; 1103 } 1104 break; 1105 case MMC_BLK_CMD_ERR: 1106 goto cmd_err; 1107 case MMC_BLK_RETRY_SINGLE: 1108 disable_multi = 1; 1109 break; 1110 case MMC_BLK_RETRY: 1111 if (retry++ < 5) 1112 break; 1113 case MMC_BLK_ABORT: 1114 goto cmd_abort; 1115 case MMC_BLK_DATA_ERR: 1116 /* 1117 * After an error, we redo I/O one sector at a 1118 * time, so we only reach here after trying to 1119 * read a single sector. 1120 */ 1121 spin_lock_irq(&md->lock); 1122 ret = __blk_end_request(req, -EIO, 1123 brq->data.blksz); 1124 spin_unlock_irq(&md->lock); 1125 if (!ret) 1126 goto start_new_req; 1127 break; 1128 } 1129 1130 if (ret) { 1131 /* 1132 * In case of a none complete request 1133 * prepare it again and resend. 1134 */ 1135 mmc_blk_rw_rq_prep(mq_rq, card, disable_multi, mq); 1136 mmc_start_req(card->host, &mq_rq->mmc_active, NULL); 1137 } 1138 } while (ret); 1139 1140 return 1; 1141 1142 cmd_err: 1143 /* 1144 * If this is an SD card and we're writing, we can first 1145 * mark the known good sectors as ok. 1146 * 1147 * If the card is not SD, we can still ok written sectors 1148 * as reported by the controller (which might be less than 1149 * the real number of written sectors, but never more). 1150 */ 1151 if (mmc_card_sd(card)) { 1152 u32 blocks; 1153 1154 blocks = mmc_sd_num_wr_blocks(card); 1155 if (blocks != (u32)-1) { 1156 spin_lock_irq(&md->lock); 1157 ret = __blk_end_request(req, 0, blocks << 9); 1158 spin_unlock_irq(&md->lock); 1159 } 1160 } else { 1161 spin_lock_irq(&md->lock); 1162 ret = __blk_end_request(req, 0, brq->data.bytes_xfered); 1163 spin_unlock_irq(&md->lock); 1164 } 1165 1166 cmd_abort: 1167 spin_lock_irq(&md->lock); 1168 while (ret) 1169 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req)); 1170 spin_unlock_irq(&md->lock); 1171 1172 start_new_req: 1173 if (rqc) { 1174 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq); 1175 mmc_start_req(card->host, &mq->mqrq_cur->mmc_active, NULL); 1176 } 1177 1178 return 0; 1179} 1180 1181static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) 1182{ 1183 int ret; 1184 struct mmc_blk_data *md = mq->data; 1185 struct mmc_card *card = md->queue.card; 1186 1187 if (req && !mq->mqrq_prev->req) 1188 /* claim host only for the first request */ 1189 mmc_claim_host(card->host); 1190 1191 ret = mmc_blk_part_switch(card, md); 1192 if (ret) { 1193 ret = 0; 1194 goto out; 1195 } 1196 1197 if (req && req->cmd_flags & REQ_DISCARD) { 1198 /* complete ongoing async transfer before issuing discard */ 1199 if (card->host->areq) 1200 mmc_blk_issue_rw_rq(mq, NULL); 1201 if (req->cmd_flags & REQ_SECURE) 1202 ret = mmc_blk_issue_secdiscard_rq(mq, req); 1203 else 1204 ret = mmc_blk_issue_discard_rq(mq, req); 1205 } else if (req && req->cmd_flags & REQ_FLUSH) { 1206 /* complete ongoing async transfer before issuing flush */ 1207 if (card->host->areq) 1208 mmc_blk_issue_rw_rq(mq, NULL); 1209 ret = mmc_blk_issue_flush(mq, req); 1210 } else { 1211 ret = mmc_blk_issue_rw_rq(mq, req); 1212 } 1213 1214out: 1215 if (!req) 1216 /* release host only when there are no more requests */ 1217 mmc_release_host(card->host); 1218 return ret; 1219} 1220 1221static inline int mmc_blk_readonly(struct mmc_card *card) 1222{ 1223 return mmc_card_readonly(card) || 1224 !(card->csd.cmdclass & CCC_BLOCK_WRITE); 1225} 1226 1227static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, 1228 struct device *parent, 1229 sector_t size, 1230 bool default_ro, 1231 const char *subname) 1232{ 1233 struct mmc_blk_data *md; 1234 int devidx, ret; 1235 1236 devidx = find_first_zero_bit(dev_use, max_devices); 1237 if (devidx >= max_devices) 1238 return ERR_PTR(-ENOSPC); 1239 __set_bit(devidx, dev_use); 1240 1241 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL); 1242 if (!md) { 1243 ret = -ENOMEM; 1244 goto out; 1245 } 1246 1247 /* 1248 * !subname implies we are creating main mmc_blk_data that will be 1249 * associated with mmc_card with mmc_set_drvdata. Due to device 1250 * partitions, devidx will not coincide with a per-physical card 1251 * index anymore so we keep track of a name index. 1252 */ 1253 if (!subname) { 1254 md->name_idx = find_first_zero_bit(name_use, max_devices); 1255 __set_bit(md->name_idx, name_use); 1256 } 1257 else 1258 md->name_idx = ((struct mmc_blk_data *) 1259 dev_to_disk(parent)->private_data)->name_idx; 1260 1261 /* 1262 * Set the read-only status based on the supported commands 1263 * and the write protect switch. 1264 */ 1265 md->read_only = mmc_blk_readonly(card); 1266 1267 md->disk = alloc_disk(perdev_minors); 1268 if (md->disk == NULL) { 1269 ret = -ENOMEM; 1270 goto err_kfree; 1271 } 1272 1273 spin_lock_init(&md->lock); 1274 INIT_LIST_HEAD(&md->part); 1275 md->usage = 1; 1276 1277 ret = mmc_init_queue(&md->queue, card, &md->lock, subname); 1278 if (ret) 1279 goto err_putdisk; 1280 1281 md->queue.issue_fn = mmc_blk_issue_rq; 1282 md->queue.data = md; 1283 1284 md->disk->major = MMC_BLOCK_MAJOR; 1285 md->disk->first_minor = devidx * perdev_minors; 1286 md->disk->fops = &mmc_bdops; 1287 md->disk->private_data = md; 1288 md->disk->queue = md->queue.queue; 1289 md->disk->driverfs_dev = parent; 1290 set_disk_ro(md->disk, md->read_only || default_ro); 1291 1292 /* 1293 * As discussed on lkml, GENHD_FL_REMOVABLE should: 1294 * 1295 * - be set for removable media with permanent block devices 1296 * - be unset for removable block devices with permanent media 1297 * 1298 * Since MMC block devices clearly fall under the second 1299 * case, we do not set GENHD_FL_REMOVABLE. Userspace 1300 * should use the block device creation/destruction hotplug 1301 * messages to tell when the card is present. 1302 */ 1303 1304 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name), 1305 "mmcblk%d%s", md->name_idx, subname ? subname : ""); 1306 1307 blk_queue_logical_block_size(md->queue.queue, 512); 1308 set_capacity(md->disk, size); 1309 1310 if (mmc_host_cmd23(card->host)) { 1311 if (mmc_card_mmc(card) || 1312 (mmc_card_sd(card) && 1313 card->scr.cmds & SD_SCR_CMD23_SUPPORT)) 1314 md->flags |= MMC_BLK_CMD23; 1315 } 1316 1317 if (mmc_card_mmc(card) && 1318 md->flags & MMC_BLK_CMD23 && 1319 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) || 1320 card->ext_csd.rel_sectors)) { 1321 md->flags |= MMC_BLK_REL_WR; 1322 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA); 1323 } 1324 1325 return md; 1326 1327 err_putdisk: 1328 put_disk(md->disk); 1329 err_kfree: 1330 kfree(md); 1331 out: 1332 return ERR_PTR(ret); 1333} 1334 1335static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) 1336{ 1337 sector_t size; 1338 struct mmc_blk_data *md; 1339 1340 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) { 1341 /* 1342 * The EXT_CSD sector count is in number or 512 byte 1343 * sectors. 1344 */ 1345 size = card->ext_csd.sectors; 1346 } else { 1347 /* 1348 * The CSD capacity field is in units of read_blkbits. 1349 * set_capacity takes units of 512 bytes. 1350 */ 1351 size = card->csd.capacity << (card->csd.read_blkbits - 9); 1352 } 1353 1354 md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL); 1355 return md; 1356} 1357 1358static int mmc_blk_alloc_part(struct mmc_card *card, 1359 struct mmc_blk_data *md, 1360 unsigned int part_type, 1361 sector_t size, 1362 bool default_ro, 1363 const char *subname) 1364{ 1365 char cap_str[10]; 1366 struct mmc_blk_data *part_md; 1367 1368 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro, 1369 subname); 1370 if (IS_ERR(part_md)) 1371 return PTR_ERR(part_md); 1372 part_md->part_type = part_type; 1373 list_add(&part_md->part, &md->part); 1374 1375 string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2, 1376 cap_str, sizeof(cap_str)); 1377 printk(KERN_INFO "%s: %s %s partition %u %s\n", 1378 part_md->disk->disk_name, mmc_card_id(card), 1379 mmc_card_name(card), part_md->part_type, cap_str); 1380 return 0; 1381} 1382 1383static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md) 1384{ 1385 int ret = 0; 1386 1387 if (!mmc_card_mmc(card)) 1388 return 0; 1389 1390 if (card->ext_csd.boot_size) { 1391 ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT0, 1392 card->ext_csd.boot_size >> 9, 1393 true, 1394 "boot0"); 1395 if (ret) 1396 return ret; 1397 ret = mmc_blk_alloc_part(card, md, EXT_CSD_PART_CONFIG_ACC_BOOT1, 1398 card->ext_csd.boot_size >> 9, 1399 true, 1400 "boot1"); 1401 if (ret) 1402 return ret; 1403 } 1404 1405 return ret; 1406} 1407 1408static int 1409mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card) 1410{ 1411 int err; 1412 1413 mmc_claim_host(card->host); 1414 err = mmc_set_blocklen(card, 512); 1415 mmc_release_host(card->host); 1416 1417 if (err) { 1418 printk(KERN_ERR "%s: unable to set block size to 512: %d\n", 1419 md->disk->disk_name, err); 1420 return -EINVAL; 1421 } 1422 1423 return 0; 1424} 1425 1426static void mmc_blk_remove_req(struct mmc_blk_data *md) 1427{ 1428 if (md) { 1429 if (md->disk->flags & GENHD_FL_UP) { 1430 device_remove_file(disk_to_dev(md->disk), &md->force_ro); 1431 1432 /* Stop new requests from getting into the queue */ 1433 del_gendisk(md->disk); 1434 } 1435 1436 /* Then flush out any already in there */ 1437 mmc_cleanup_queue(&md->queue); 1438 mmc_blk_put(md); 1439 } 1440} 1441 1442static void mmc_blk_remove_parts(struct mmc_card *card, 1443 struct mmc_blk_data *md) 1444{ 1445 struct list_head *pos, *q; 1446 struct mmc_blk_data *part_md; 1447 1448 __clear_bit(md->name_idx, name_use); 1449 list_for_each_safe(pos, q, &md->part) { 1450 part_md = list_entry(pos, struct mmc_blk_data, part); 1451 list_del(pos); 1452 mmc_blk_remove_req(part_md); 1453 } 1454} 1455 1456static int mmc_add_disk(struct mmc_blk_data *md) 1457{ 1458 int ret; 1459 1460 add_disk(md->disk); 1461 md->force_ro.show = force_ro_show; 1462 md->force_ro.store = force_ro_store; 1463 sysfs_attr_init(&md->force_ro.attr); 1464 md->force_ro.attr.name = "force_ro"; 1465 md->force_ro.attr.mode = S_IRUGO | S_IWUSR; 1466 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro); 1467 if (ret) 1468 del_gendisk(md->disk); 1469 1470 return ret; 1471} 1472 1473static const struct mmc_fixup blk_fixups[] = 1474{ 1475 MMC_FIXUP("SEM02G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38), 1476 MMC_FIXUP("SEM04G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38), 1477 MMC_FIXUP("SEM08G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38), 1478 MMC_FIXUP("SEM16G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38), 1479 MMC_FIXUP("SEM32G", 0x2, 0x100, add_quirk, MMC_QUIRK_INAND_CMD38), 1480 1481 /* 1482 * Some MMC cards experience performance degradation with CMD23 1483 * instead of CMD12-bounded multiblock transfers. For now we'll 1484 * black list what's bad... 1485 * - Certain Toshiba cards. 1486 * 1487 * N.B. This doesn't affect SD cards. 1488 */ 1489 MMC_FIXUP("MMC08G", 0x11, CID_OEMID_ANY, add_quirk_mmc, 1490 MMC_QUIRK_BLK_NO_CMD23), 1491 MMC_FIXUP("MMC16G", 0x11, CID_OEMID_ANY, add_quirk_mmc, 1492 MMC_QUIRK_BLK_NO_CMD23), 1493 MMC_FIXUP("MMC32G", 0x11, CID_OEMID_ANY, add_quirk_mmc, 1494 MMC_QUIRK_BLK_NO_CMD23), 1495 END_FIXUP 1496}; 1497 1498static int mmc_blk_probe(struct mmc_card *card) 1499{ 1500 struct mmc_blk_data *md, *part_md; 1501 int err; 1502 char cap_str[10]; 1503 1504 /* 1505 * Check that the card supports the command class(es) we need. 1506 */ 1507 if (!(card->csd.cmdclass & CCC_BLOCK_READ)) 1508 return -ENODEV; 1509 1510 md = mmc_blk_alloc(card); 1511 if (IS_ERR(md)) 1512 return PTR_ERR(md); 1513 1514 err = mmc_blk_set_blksize(md, card); 1515 if (err) 1516 goto out; 1517 1518 string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2, 1519 cap_str, sizeof(cap_str)); 1520 printk(KERN_INFO "%s: %s %s %s %s\n", 1521 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card), 1522 cap_str, md->read_only ? "(ro)" : ""); 1523 1524 if (mmc_blk_alloc_parts(card, md)) 1525 goto out; 1526 1527 mmc_set_drvdata(card, md); 1528 mmc_fixup_device(card, blk_fixups); 1529 1530 if (mmc_add_disk(md)) 1531 goto out; 1532 1533 list_for_each_entry(part_md, &md->part, part) { 1534 if (mmc_add_disk(part_md)) 1535 goto out; 1536 } 1537 return 0; 1538 1539 out: 1540 mmc_blk_remove_parts(card, md); 1541 mmc_blk_remove_req(md); 1542 return err; 1543} 1544 1545static void mmc_blk_remove(struct mmc_card *card) 1546{ 1547 struct mmc_blk_data *md = mmc_get_drvdata(card); 1548 1549 mmc_blk_remove_parts(card, md); 1550 mmc_claim_host(card->host); 1551 mmc_blk_part_switch(card, md); 1552 mmc_release_host(card->host); 1553 mmc_blk_remove_req(md); 1554 mmc_set_drvdata(card, NULL); 1555} 1556 1557#ifdef CONFIG_PM 1558static int mmc_blk_suspend(struct mmc_card *card, pm_message_t state) 1559{ 1560 struct mmc_blk_data *part_md; 1561 struct mmc_blk_data *md = mmc_get_drvdata(card); 1562 1563 if (md) { 1564 mmc_queue_suspend(&md->queue); 1565 list_for_each_entry(part_md, &md->part, part) { 1566 mmc_queue_suspend(&part_md->queue); 1567 } 1568 } 1569 return 0; 1570} 1571 1572static int mmc_blk_resume(struct mmc_card *card) 1573{ 1574 struct mmc_blk_data *part_md; 1575 struct mmc_blk_data *md = mmc_get_drvdata(card); 1576 1577 if (md) { 1578 mmc_blk_set_blksize(md, card); 1579 1580 /* 1581 * Resume involves the card going into idle state, 1582 * so current partition is always the main one. 1583 */ 1584 md->part_curr = md->part_type; 1585 mmc_queue_resume(&md->queue); 1586 list_for_each_entry(part_md, &md->part, part) { 1587 mmc_queue_resume(&part_md->queue); 1588 } 1589 } 1590 return 0; 1591} 1592#else 1593#define mmc_blk_suspend NULL 1594#define mmc_blk_resume NULL 1595#endif 1596 1597static struct mmc_driver mmc_driver = { 1598 .drv = { 1599 .name = "mmcblk", 1600 }, 1601 .probe = mmc_blk_probe, 1602 .remove = mmc_blk_remove, 1603 .suspend = mmc_blk_suspend, 1604 .resume = mmc_blk_resume, 1605}; 1606 1607static int __init mmc_blk_init(void) 1608{ 1609 int res; 1610 1611 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS) 1612 pr_info("mmcblk: using %d minors per device\n", perdev_minors); 1613 1614 max_devices = 256 / perdev_minors; 1615 1616 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc"); 1617 if (res) 1618 goto out; 1619 1620 res = mmc_register_driver(&mmc_driver); 1621 if (res) 1622 goto out2; 1623 1624 return 0; 1625 out2: 1626 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); 1627 out: 1628 return res; 1629} 1630 1631static void __exit mmc_blk_exit(void) 1632{ 1633 mmc_unregister_driver(&mmc_driver); 1634 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); 1635} 1636 1637module_init(mmc_blk_init); 1638module_exit(mmc_blk_exit); 1639 1640MODULE_LICENSE("GPL"); 1641MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver"); 1642 1643