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[mirror_ubuntu-artful-kernel.git] / drivers / mmc / card / block.c
1 /*
2 * Block driver for media (i.e., flash cards)
3 *
4 * Copyright 2002 Hewlett-Packard Company
5 * Copyright 2005-2008 Pierre Ossman
6 *
7 * Use consistent with the GNU GPL is permitted,
8 * provided that this copyright notice is
9 * preserved in its entirety in all copies and derived works.
10 *
11 * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
12 * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
13 * FITNESS FOR ANY PARTICULAR PURPOSE.
14 *
15 * Many thanks to Alessandro Rubini and Jonathan Corbet!
16 *
17 * Author: Andrew Christian
18 * 28 May 2002
19 */
20 #include <linux/moduleparam.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23
24 #include <linux/kernel.h>
25 #include <linux/fs.h>
26 #include <linux/slab.h>
27 #include <linux/errno.h>
28 #include <linux/hdreg.h>
29 #include <linux/kdev_t.h>
30 #include <linux/blkdev.h>
31 #include <linux/mutex.h>
32 #include <linux/scatterlist.h>
33 #include <linux/string_helpers.h>
34 #include <linux/delay.h>
35 #include <linux/capability.h>
36 #include <linux/compat.h>
37
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/uaccess.h>
45
46 #include "queue.h"
47
48 MODULE_ALIAS("mmc:block");
49 #ifdef MODULE_PARAM_PREFIX
50 #undef MODULE_PARAM_PREFIX
51 #endif
52 #define MODULE_PARAM_PREFIX "mmcblk."
53
54 #define INAND_CMD38_ARG_EXT_CSD 113
55 #define INAND_CMD38_ARG_ERASE 0x00
56 #define INAND_CMD38_ARG_TRIM 0x01
57 #define INAND_CMD38_ARG_SECERASE 0x80
58 #define INAND_CMD38_ARG_SECTRIM1 0x81
59 #define INAND_CMD38_ARG_SECTRIM2 0x88
60
61 static DEFINE_MUTEX(block_mutex);
62
63 /*
64 * The defaults come from config options but can be overriden by module
65 * or bootarg options.
66 */
67 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
68
69 /*
70 * We've only got one major, so number of mmcblk devices is
71 * limited to 256 / number of minors per device.
72 */
73 static int max_devices;
74
75 /* 256 minors, so at most 256 separate devices */
76 static DECLARE_BITMAP(dev_use, 256);
77 static DECLARE_BITMAP(name_use, 256);
78
79 /*
80 * There is one mmc_blk_data per slot.
81 */
82 struct mmc_blk_data {
83 spinlock_t lock;
84 struct gendisk *disk;
85 struct mmc_queue queue;
86 struct list_head part;
87
88 unsigned int flags;
89 #define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
90 #define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */
91
92 unsigned int usage;
93 unsigned int read_only;
94 unsigned int part_type;
95 unsigned int name_idx;
96 unsigned int reset_done;
97 #define MMC_BLK_READ BIT(0)
98 #define MMC_BLK_WRITE BIT(1)
99 #define MMC_BLK_DISCARD BIT(2)
100 #define MMC_BLK_SECDISCARD BIT(3)
101
102 /*
103 * Only set in main mmc_blk_data associated
104 * with mmc_card with mmc_set_drvdata, and keeps
105 * track of the current selected device partition.
106 */
107 unsigned int part_curr;
108 struct device_attribute force_ro;
109 struct device_attribute power_ro_lock;
110 int area_type;
111 };
112
113 static DEFINE_MUTEX(open_lock);
114
115 enum mmc_blk_status {
116 MMC_BLK_SUCCESS = 0,
117 MMC_BLK_PARTIAL,
118 MMC_BLK_CMD_ERR,
119 MMC_BLK_RETRY,
120 MMC_BLK_ABORT,
121 MMC_BLK_DATA_ERR,
122 MMC_BLK_ECC_ERR,
123 MMC_BLK_NOMEDIUM,
124 };
125
126 module_param(perdev_minors, int, 0444);
127 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
128
129 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
130 {
131 struct mmc_blk_data *md;
132
133 mutex_lock(&open_lock);
134 md = disk->private_data;
135 if (md && md->usage == 0)
136 md = NULL;
137 if (md)
138 md->usage++;
139 mutex_unlock(&open_lock);
140
141 return md;
142 }
143
144 static inline int mmc_get_devidx(struct gendisk *disk)
145 {
146 int devmaj = MAJOR(disk_devt(disk));
147 int devidx = MINOR(disk_devt(disk)) / perdev_minors;
148
149 if (!devmaj)
150 devidx = disk->first_minor / perdev_minors;
151 return devidx;
152 }
153
154 static void mmc_blk_put(struct mmc_blk_data *md)
155 {
156 mutex_lock(&open_lock);
157 md->usage--;
158 if (md->usage == 0) {
159 int devidx = mmc_get_devidx(md->disk);
160 blk_cleanup_queue(md->queue.queue);
161
162 __clear_bit(devidx, dev_use);
163
164 put_disk(md->disk);
165 kfree(md);
166 }
167 mutex_unlock(&open_lock);
168 }
169
170 static ssize_t power_ro_lock_show(struct device *dev,
171 struct device_attribute *attr, char *buf)
172 {
173 int ret;
174 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
175 struct mmc_card *card = md->queue.card;
176 int locked = 0;
177
178 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
179 locked = 2;
180 else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
181 locked = 1;
182
183 ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
184
185 return ret;
186 }
187
188 static ssize_t power_ro_lock_store(struct device *dev,
189 struct device_attribute *attr, const char *buf, size_t count)
190 {
191 int ret;
192 struct mmc_blk_data *md, *part_md;
193 struct mmc_card *card;
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 card = md->queue.card;
204
205 mmc_claim_host(card->host);
206
207 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
208 card->ext_csd.boot_ro_lock |
209 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
210 card->ext_csd.part_time);
211 if (ret)
212 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
213 else
214 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
215
216 mmc_release_host(card->host);
217
218 if (!ret) {
219 pr_info("%s: Locking boot partition ro until next power on\n",
220 md->disk->disk_name);
221 set_disk_ro(md->disk, 1);
222
223 list_for_each_entry(part_md, &md->part, part)
224 if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
225 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
226 set_disk_ro(part_md->disk, 1);
227 }
228 }
229
230 mmc_blk_put(md);
231 return count;
232 }
233
234 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
235 char *buf)
236 {
237 int ret;
238 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
239
240 ret = snprintf(buf, PAGE_SIZE, "%d",
241 get_disk_ro(dev_to_disk(dev)) ^
242 md->read_only);
243 mmc_blk_put(md);
244 return ret;
245 }
246
247 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
248 const char *buf, size_t count)
249 {
250 int ret;
251 char *end;
252 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
253 unsigned long set = simple_strtoul(buf, &end, 0);
254 if (end == buf) {
255 ret = -EINVAL;
256 goto out;
257 }
258
259 set_disk_ro(dev_to_disk(dev), set || md->read_only);
260 ret = count;
261 out:
262 mmc_blk_put(md);
263 return ret;
264 }
265
266 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
267 {
268 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
269 int ret = -ENXIO;
270
271 mutex_lock(&block_mutex);
272 if (md) {
273 if (md->usage == 2)
274 check_disk_change(bdev);
275 ret = 0;
276
277 if ((mode & FMODE_WRITE) && md->read_only) {
278 mmc_blk_put(md);
279 ret = -EROFS;
280 }
281 }
282 mutex_unlock(&block_mutex);
283
284 return ret;
285 }
286
287 static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
288 {
289 struct mmc_blk_data *md = disk->private_data;
290
291 mutex_lock(&block_mutex);
292 mmc_blk_put(md);
293 mutex_unlock(&block_mutex);
294 return 0;
295 }
296
297 static int
298 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
299 {
300 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
301 geo->heads = 4;
302 geo->sectors = 16;
303 return 0;
304 }
305
306 struct mmc_blk_ioc_data {
307 struct mmc_ioc_cmd ic;
308 unsigned char *buf;
309 u64 buf_bytes;
310 };
311
312 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
313 struct mmc_ioc_cmd __user *user)
314 {
315 struct mmc_blk_ioc_data *idata;
316 int err;
317
318 idata = kzalloc(sizeof(*idata), GFP_KERNEL);
319 if (!idata) {
320 err = -ENOMEM;
321 goto out;
322 }
323
324 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
325 err = -EFAULT;
326 goto idata_err;
327 }
328
329 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
330 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
331 err = -EOVERFLOW;
332 goto idata_err;
333 }
334
335 if (!idata->buf_bytes)
336 return idata;
337
338 idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
339 if (!idata->buf) {
340 err = -ENOMEM;
341 goto idata_err;
342 }
343
344 if (copy_from_user(idata->buf, (void __user *)(unsigned long)
345 idata->ic.data_ptr, idata->buf_bytes)) {
346 err = -EFAULT;
347 goto copy_err;
348 }
349
350 return idata;
351
352 copy_err:
353 kfree(idata->buf);
354 idata_err:
355 kfree(idata);
356 out:
357 return ERR_PTR(err);
358 }
359
360 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
361 struct mmc_ioc_cmd __user *ic_ptr)
362 {
363 struct mmc_blk_ioc_data *idata;
364 struct mmc_blk_data *md;
365 struct mmc_card *card;
366 struct mmc_command cmd = {0};
367 struct mmc_data data = {0};
368 struct mmc_request mrq = {NULL};
369 struct scatterlist sg;
370 int err;
371
372 /*
373 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
374 * whole block device, not on a partition. This prevents overspray
375 * between sibling partitions.
376 */
377 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
378 return -EPERM;
379
380 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
381 if (IS_ERR(idata))
382 return PTR_ERR(idata);
383
384 md = mmc_blk_get(bdev->bd_disk);
385 if (!md) {
386 err = -EINVAL;
387 goto cmd_done;
388 }
389
390 card = md->queue.card;
391 if (IS_ERR(card)) {
392 err = PTR_ERR(card);
393 goto cmd_done;
394 }
395
396 cmd.opcode = idata->ic.opcode;
397 cmd.arg = idata->ic.arg;
398 cmd.flags = idata->ic.flags;
399
400 if (idata->buf_bytes) {
401 data.sg = &sg;
402 data.sg_len = 1;
403 data.blksz = idata->ic.blksz;
404 data.blocks = idata->ic.blocks;
405
406 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
407
408 if (idata->ic.write_flag)
409 data.flags = MMC_DATA_WRITE;
410 else
411 data.flags = MMC_DATA_READ;
412
413 /* data.flags must already be set before doing this. */
414 mmc_set_data_timeout(&data, card);
415
416 /* Allow overriding the timeout_ns for empirical tuning. */
417 if (idata->ic.data_timeout_ns)
418 data.timeout_ns = idata->ic.data_timeout_ns;
419
420 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
421 /*
422 * Pretend this is a data transfer and rely on the
423 * host driver to compute timeout. When all host
424 * drivers support cmd.cmd_timeout for R1B, this
425 * can be changed to:
426 *
427 * mrq.data = NULL;
428 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
429 */
430 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
431 }
432
433 mrq.data = &data;
434 }
435
436 mrq.cmd = &cmd;
437
438 mmc_claim_host(card->host);
439
440 if (idata->ic.is_acmd) {
441 err = mmc_app_cmd(card->host, card);
442 if (err)
443 goto cmd_rel_host;
444 }
445
446 mmc_wait_for_req(card->host, &mrq);
447
448 if (cmd.error) {
449 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
450 __func__, cmd.error);
451 err = cmd.error;
452 goto cmd_rel_host;
453 }
454 if (data.error) {
455 dev_err(mmc_dev(card->host), "%s: data error %d\n",
456 __func__, data.error);
457 err = data.error;
458 goto cmd_rel_host;
459 }
460
461 /*
462 * According to the SD specs, some commands require a delay after
463 * issuing the command.
464 */
465 if (idata->ic.postsleep_min_us)
466 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
467
468 if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
469 err = -EFAULT;
470 goto cmd_rel_host;
471 }
472
473 if (!idata->ic.write_flag) {
474 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
475 idata->buf, idata->buf_bytes)) {
476 err = -EFAULT;
477 goto cmd_rel_host;
478 }
479 }
480
481 cmd_rel_host:
482 mmc_release_host(card->host);
483
484 cmd_done:
485 mmc_blk_put(md);
486 kfree(idata->buf);
487 kfree(idata);
488 return err;
489 }
490
491 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
492 unsigned int cmd, unsigned long arg)
493 {
494 int ret = -EINVAL;
495 if (cmd == MMC_IOC_CMD)
496 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
497 return ret;
498 }
499
500 #ifdef CONFIG_COMPAT
501 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
502 unsigned int cmd, unsigned long arg)
503 {
504 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
505 }
506 #endif
507
508 static const struct block_device_operations mmc_bdops = {
509 .open = mmc_blk_open,
510 .release = mmc_blk_release,
511 .getgeo = mmc_blk_getgeo,
512 .owner = THIS_MODULE,
513 .ioctl = mmc_blk_ioctl,
514 #ifdef CONFIG_COMPAT
515 .compat_ioctl = mmc_blk_compat_ioctl,
516 #endif
517 };
518
519 static inline int mmc_blk_part_switch(struct mmc_card *card,
520 struct mmc_blk_data *md)
521 {
522 int ret;
523 struct mmc_blk_data *main_md = mmc_get_drvdata(card);
524
525 if (main_md->part_curr == md->part_type)
526 return 0;
527
528 if (mmc_card_mmc(card)) {
529 u8 part_config = card->ext_csd.part_config;
530
531 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
532 part_config |= md->part_type;
533
534 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
535 EXT_CSD_PART_CONFIG, part_config,
536 card->ext_csd.part_time);
537 if (ret)
538 return ret;
539
540 card->ext_csd.part_config = part_config;
541 }
542
543 main_md->part_curr = md->part_type;
544 return 0;
545 }
546
547 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
548 {
549 int err;
550 u32 result;
551 __be32 *blocks;
552
553 struct mmc_request mrq = {NULL};
554 struct mmc_command cmd = {0};
555 struct mmc_data data = {0};
556 unsigned int timeout_us;
557
558 struct scatterlist sg;
559
560 cmd.opcode = MMC_APP_CMD;
561 cmd.arg = card->rca << 16;
562 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
563
564 err = mmc_wait_for_cmd(card->host, &cmd, 0);
565 if (err)
566 return (u32)-1;
567 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
568 return (u32)-1;
569
570 memset(&cmd, 0, sizeof(struct mmc_command));
571
572 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
573 cmd.arg = 0;
574 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
575
576 data.timeout_ns = card->csd.tacc_ns * 100;
577 data.timeout_clks = card->csd.tacc_clks * 100;
578
579 timeout_us = data.timeout_ns / 1000;
580 timeout_us += data.timeout_clks * 1000 /
581 (card->host->ios.clock / 1000);
582
583 if (timeout_us > 100000) {
584 data.timeout_ns = 100000000;
585 data.timeout_clks = 0;
586 }
587
588 data.blksz = 4;
589 data.blocks = 1;
590 data.flags = MMC_DATA_READ;
591 data.sg = &sg;
592 data.sg_len = 1;
593
594 mrq.cmd = &cmd;
595 mrq.data = &data;
596
597 blocks = kmalloc(4, GFP_KERNEL);
598 if (!blocks)
599 return (u32)-1;
600
601 sg_init_one(&sg, blocks, 4);
602
603 mmc_wait_for_req(card->host, &mrq);
604
605 result = ntohl(*blocks);
606 kfree(blocks);
607
608 if (cmd.error || data.error)
609 result = (u32)-1;
610
611 return result;
612 }
613
614 static int send_stop(struct mmc_card *card, u32 *status)
615 {
616 struct mmc_command cmd = {0};
617 int err;
618
619 cmd.opcode = MMC_STOP_TRANSMISSION;
620 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
621 err = mmc_wait_for_cmd(card->host, &cmd, 5);
622 if (err == 0)
623 *status = cmd.resp[0];
624 return err;
625 }
626
627 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
628 {
629 struct mmc_command cmd = {0};
630 int err;
631
632 cmd.opcode = MMC_SEND_STATUS;
633 if (!mmc_host_is_spi(card->host))
634 cmd.arg = card->rca << 16;
635 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
636 err = mmc_wait_for_cmd(card->host, &cmd, retries);
637 if (err == 0)
638 *status = cmd.resp[0];
639 return err;
640 }
641
642 #define ERR_NOMEDIUM 3
643 #define ERR_RETRY 2
644 #define ERR_ABORT 1
645 #define ERR_CONTINUE 0
646
647 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
648 bool status_valid, u32 status)
649 {
650 switch (error) {
651 case -EILSEQ:
652 /* response crc error, retry the r/w cmd */
653 pr_err("%s: %s sending %s command, card status %#x\n",
654 req->rq_disk->disk_name, "response CRC error",
655 name, status);
656 return ERR_RETRY;
657
658 case -ETIMEDOUT:
659 pr_err("%s: %s sending %s command, card status %#x\n",
660 req->rq_disk->disk_name, "timed out", name, status);
661
662 /* If the status cmd initially failed, retry the r/w cmd */
663 if (!status_valid)
664 return ERR_RETRY;
665
666 /*
667 * If it was a r/w cmd crc error, or illegal command
668 * (eg, issued in wrong state) then retry - we should
669 * have corrected the state problem above.
670 */
671 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
672 return ERR_RETRY;
673
674 /* Otherwise abort the command */
675 return ERR_ABORT;
676
677 default:
678 /* We don't understand the error code the driver gave us */
679 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
680 req->rq_disk->disk_name, error, status);
681 return ERR_ABORT;
682 }
683 }
684
685 /*
686 * Initial r/w and stop cmd error recovery.
687 * We don't know whether the card received the r/w cmd or not, so try to
688 * restore things back to a sane state. Essentially, we do this as follows:
689 * - Obtain card status. If the first attempt to obtain card status fails,
690 * the status word will reflect the failed status cmd, not the failed
691 * r/w cmd. If we fail to obtain card status, it suggests we can no
692 * longer communicate with the card.
693 * - Check the card state. If the card received the cmd but there was a
694 * transient problem with the response, it might still be in a data transfer
695 * mode. Try to send it a stop command. If this fails, we can't recover.
696 * - If the r/w cmd failed due to a response CRC error, it was probably
697 * transient, so retry the cmd.
698 * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
699 * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
700 * illegal cmd, retry.
701 * Otherwise we don't understand what happened, so abort.
702 */
703 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
704 struct mmc_blk_request *brq, int *ecc_err)
705 {
706 bool prev_cmd_status_valid = true;
707 u32 status, stop_status = 0;
708 int err, retry;
709
710 if (mmc_card_removed(card))
711 return ERR_NOMEDIUM;
712
713 /*
714 * Try to get card status which indicates both the card state
715 * and why there was no response. If the first attempt fails,
716 * we can't be sure the returned status is for the r/w command.
717 */
718 for (retry = 2; retry >= 0; retry--) {
719 err = get_card_status(card, &status, 0);
720 if (!err)
721 break;
722
723 prev_cmd_status_valid = false;
724 pr_err("%s: error %d sending status command, %sing\n",
725 req->rq_disk->disk_name, err, retry ? "retry" : "abort");
726 }
727
728 /* We couldn't get a response from the card. Give up. */
729 if (err) {
730 /* Check if the card is removed */
731 if (mmc_detect_card_removed(card->host))
732 return ERR_NOMEDIUM;
733 return ERR_ABORT;
734 }
735
736 /* Flag ECC errors */
737 if ((status & R1_CARD_ECC_FAILED) ||
738 (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
739 (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
740 *ecc_err = 1;
741
742 /*
743 * Check the current card state. If it is in some data transfer
744 * mode, tell it to stop (and hopefully transition back to TRAN.)
745 */
746 if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
747 R1_CURRENT_STATE(status) == R1_STATE_RCV) {
748 err = send_stop(card, &stop_status);
749 if (err)
750 pr_err("%s: error %d sending stop command\n",
751 req->rq_disk->disk_name, err);
752
753 /*
754 * If the stop cmd also timed out, the card is probably
755 * not present, so abort. Other errors are bad news too.
756 */
757 if (err)
758 return ERR_ABORT;
759 if (stop_status & R1_CARD_ECC_FAILED)
760 *ecc_err = 1;
761 }
762
763 /* Check for set block count errors */
764 if (brq->sbc.error)
765 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
766 prev_cmd_status_valid, status);
767
768 /* Check for r/w command errors */
769 if (brq->cmd.error)
770 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
771 prev_cmd_status_valid, status);
772
773 /* Data errors */
774 if (!brq->stop.error)
775 return ERR_CONTINUE;
776
777 /* Now for stop errors. These aren't fatal to the transfer. */
778 pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
779 req->rq_disk->disk_name, brq->stop.error,
780 brq->cmd.resp[0], status);
781
782 /*
783 * Subsitute in our own stop status as this will give the error
784 * state which happened during the execution of the r/w command.
785 */
786 if (stop_status) {
787 brq->stop.resp[0] = stop_status;
788 brq->stop.error = 0;
789 }
790 return ERR_CONTINUE;
791 }
792
793 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
794 int type)
795 {
796 int err;
797
798 if (md->reset_done & type)
799 return -EEXIST;
800
801 md->reset_done |= type;
802 err = mmc_hw_reset(host);
803 /* Ensure we switch back to the correct partition */
804 if (err != -EOPNOTSUPP) {
805 struct mmc_blk_data *main_md = mmc_get_drvdata(host->card);
806 int part_err;
807
808 main_md->part_curr = main_md->part_type;
809 part_err = mmc_blk_part_switch(host->card, md);
810 if (part_err) {
811 /*
812 * We have failed to get back into the correct
813 * partition, so we need to abort the whole request.
814 */
815 return -ENODEV;
816 }
817 }
818 return err;
819 }
820
821 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
822 {
823 md->reset_done &= ~type;
824 }
825
826 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
827 {
828 struct mmc_blk_data *md = mq->data;
829 struct mmc_card *card = md->queue.card;
830 unsigned int from, nr, arg;
831 int err = 0, type = MMC_BLK_DISCARD;
832
833 if (!mmc_can_erase(card)) {
834 err = -EOPNOTSUPP;
835 goto out;
836 }
837
838 from = blk_rq_pos(req);
839 nr = blk_rq_sectors(req);
840
841 if (mmc_can_discard(card))
842 arg = MMC_DISCARD_ARG;
843 else if (mmc_can_trim(card))
844 arg = MMC_TRIM_ARG;
845 else
846 arg = MMC_ERASE_ARG;
847 retry:
848 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
849 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
850 INAND_CMD38_ARG_EXT_CSD,
851 arg == MMC_TRIM_ARG ?
852 INAND_CMD38_ARG_TRIM :
853 INAND_CMD38_ARG_ERASE,
854 0);
855 if (err)
856 goto out;
857 }
858 err = mmc_erase(card, from, nr, arg);
859 out:
860 if (err == -EIO && !mmc_blk_reset(md, card->host, type))
861 goto retry;
862 if (!err)
863 mmc_blk_reset_success(md, type);
864 spin_lock_irq(&md->lock);
865 __blk_end_request(req, err, blk_rq_bytes(req));
866 spin_unlock_irq(&md->lock);
867
868 return err ? 0 : 1;
869 }
870
871 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
872 struct request *req)
873 {
874 struct mmc_blk_data *md = mq->data;
875 struct mmc_card *card = md->queue.card;
876 unsigned int from, nr, arg, trim_arg, erase_arg;
877 int err = 0, type = MMC_BLK_SECDISCARD;
878
879 if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
880 err = -EOPNOTSUPP;
881 goto out;
882 }
883
884 from = blk_rq_pos(req);
885 nr = blk_rq_sectors(req);
886
887 /* The sanitize operation is supported at v4.5 only */
888 if (mmc_can_sanitize(card)) {
889 erase_arg = MMC_ERASE_ARG;
890 trim_arg = MMC_TRIM_ARG;
891 } else {
892 erase_arg = MMC_SECURE_ERASE_ARG;
893 trim_arg = MMC_SECURE_TRIM1_ARG;
894 }
895
896 if (mmc_erase_group_aligned(card, from, nr))
897 arg = erase_arg;
898 else if (mmc_can_trim(card))
899 arg = trim_arg;
900 else {
901 err = -EINVAL;
902 goto out;
903 }
904 retry:
905 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
906 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
907 INAND_CMD38_ARG_EXT_CSD,
908 arg == MMC_SECURE_TRIM1_ARG ?
909 INAND_CMD38_ARG_SECTRIM1 :
910 INAND_CMD38_ARG_SECERASE,
911 0);
912 if (err)
913 goto out_retry;
914 }
915
916 err = mmc_erase(card, from, nr, arg);
917 if (err == -EIO)
918 goto out_retry;
919 if (err)
920 goto out;
921
922 if (arg == MMC_SECURE_TRIM1_ARG) {
923 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
924 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
925 INAND_CMD38_ARG_EXT_CSD,
926 INAND_CMD38_ARG_SECTRIM2,
927 0);
928 if (err)
929 goto out_retry;
930 }
931
932 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
933 if (err == -EIO)
934 goto out_retry;
935 if (err)
936 goto out;
937 }
938
939 if (mmc_can_sanitize(card))
940 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
941 EXT_CSD_SANITIZE_START, 1, 0);
942 out_retry:
943 if (err && !mmc_blk_reset(md, card->host, type))
944 goto retry;
945 if (!err)
946 mmc_blk_reset_success(md, type);
947 out:
948 spin_lock_irq(&md->lock);
949 __blk_end_request(req, err, blk_rq_bytes(req));
950 spin_unlock_irq(&md->lock);
951
952 return err ? 0 : 1;
953 }
954
955 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
956 {
957 struct mmc_blk_data *md = mq->data;
958 struct mmc_card *card = md->queue.card;
959 int ret = 0;
960
961 ret = mmc_flush_cache(card);
962 if (ret)
963 ret = -EIO;
964
965 spin_lock_irq(&md->lock);
966 __blk_end_request_all(req, ret);
967 spin_unlock_irq(&md->lock);
968
969 return ret ? 0 : 1;
970 }
971
972 /*
973 * Reformat current write as a reliable write, supporting
974 * both legacy and the enhanced reliable write MMC cards.
975 * In each transfer we'll handle only as much as a single
976 * reliable write can handle, thus finish the request in
977 * partial completions.
978 */
979 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
980 struct mmc_card *card,
981 struct request *req)
982 {
983 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
984 /* Legacy mode imposes restrictions on transfers. */
985 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
986 brq->data.blocks = 1;
987
988 if (brq->data.blocks > card->ext_csd.rel_sectors)
989 brq->data.blocks = card->ext_csd.rel_sectors;
990 else if (brq->data.blocks < card->ext_csd.rel_sectors)
991 brq->data.blocks = 1;
992 }
993 }
994
995 #define CMD_ERRORS \
996 (R1_OUT_OF_RANGE | /* Command argument out of range */ \
997 R1_ADDRESS_ERROR | /* Misaligned address */ \
998 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
999 R1_WP_VIOLATION | /* Tried to write to protected block */ \
1000 R1_CC_ERROR | /* Card controller error */ \
1001 R1_ERROR) /* General/unknown error */
1002
1003 static int mmc_blk_err_check(struct mmc_card *card,
1004 struct mmc_async_req *areq)
1005 {
1006 struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1007 mmc_active);
1008 struct mmc_blk_request *brq = &mq_mrq->brq;
1009 struct request *req = mq_mrq->req;
1010 int ecc_err = 0;
1011
1012 /*
1013 * sbc.error indicates a problem with the set block count
1014 * command. No data will have been transferred.
1015 *
1016 * cmd.error indicates a problem with the r/w command. No
1017 * data will have been transferred.
1018 *
1019 * stop.error indicates a problem with the stop command. Data
1020 * may have been transferred, or may still be transferring.
1021 */
1022 if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1023 brq->data.error) {
1024 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err)) {
1025 case ERR_RETRY:
1026 return MMC_BLK_RETRY;
1027 case ERR_ABORT:
1028 return MMC_BLK_ABORT;
1029 case ERR_NOMEDIUM:
1030 return MMC_BLK_NOMEDIUM;
1031 case ERR_CONTINUE:
1032 break;
1033 }
1034 }
1035
1036 /*
1037 * Check for errors relating to the execution of the
1038 * initial command - such as address errors. No data
1039 * has been transferred.
1040 */
1041 if (brq->cmd.resp[0] & CMD_ERRORS) {
1042 pr_err("%s: r/w command failed, status = %#x\n",
1043 req->rq_disk->disk_name, brq->cmd.resp[0]);
1044 return MMC_BLK_ABORT;
1045 }
1046
1047 /*
1048 * Everything else is either success, or a data error of some
1049 * kind. If it was a write, we may have transitioned to
1050 * program mode, which we have to wait for it to complete.
1051 */
1052 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1053 u32 status;
1054 do {
1055 int err = get_card_status(card, &status, 5);
1056 if (err) {
1057 pr_err("%s: error %d requesting status\n",
1058 req->rq_disk->disk_name, err);
1059 return MMC_BLK_CMD_ERR;
1060 }
1061 /*
1062 * Some cards mishandle the status bits,
1063 * so make sure to check both the busy
1064 * indication and the card state.
1065 */
1066 } while (!(status & R1_READY_FOR_DATA) ||
1067 (R1_CURRENT_STATE(status) == R1_STATE_PRG));
1068 }
1069
1070 if (brq->data.error) {
1071 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1072 req->rq_disk->disk_name, brq->data.error,
1073 (unsigned)blk_rq_pos(req),
1074 (unsigned)blk_rq_sectors(req),
1075 brq->cmd.resp[0], brq->stop.resp[0]);
1076
1077 if (rq_data_dir(req) == READ) {
1078 if (ecc_err)
1079 return MMC_BLK_ECC_ERR;
1080 return MMC_BLK_DATA_ERR;
1081 } else {
1082 return MMC_BLK_CMD_ERR;
1083 }
1084 }
1085
1086 if (!brq->data.bytes_xfered)
1087 return MMC_BLK_RETRY;
1088
1089 if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1090 return MMC_BLK_PARTIAL;
1091
1092 return MMC_BLK_SUCCESS;
1093 }
1094
1095 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1096 struct mmc_card *card,
1097 int disable_multi,
1098 struct mmc_queue *mq)
1099 {
1100 u32 readcmd, writecmd;
1101 struct mmc_blk_request *brq = &mqrq->brq;
1102 struct request *req = mqrq->req;
1103 struct mmc_blk_data *md = mq->data;
1104 bool do_data_tag;
1105
1106 /*
1107 * Reliable writes are used to implement Forced Unit Access and
1108 * REQ_META accesses, and are supported only on MMCs.
1109 *
1110 * XXX: this really needs a good explanation of why REQ_META
1111 * is treated special.
1112 */
1113 bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1114 (req->cmd_flags & REQ_META)) &&
1115 (rq_data_dir(req) == WRITE) &&
1116 (md->flags & MMC_BLK_REL_WR);
1117
1118 memset(brq, 0, sizeof(struct mmc_blk_request));
1119 brq->mrq.cmd = &brq->cmd;
1120 brq->mrq.data = &brq->data;
1121
1122 brq->cmd.arg = blk_rq_pos(req);
1123 if (!mmc_card_blockaddr(card))
1124 brq->cmd.arg <<= 9;
1125 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1126 brq->data.blksz = 512;
1127 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1128 brq->stop.arg = 0;
1129 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1130 brq->data.blocks = blk_rq_sectors(req);
1131
1132 /*
1133 * The block layer doesn't support all sector count
1134 * restrictions, so we need to be prepared for too big
1135 * requests.
1136 */
1137 if (brq->data.blocks > card->host->max_blk_count)
1138 brq->data.blocks = card->host->max_blk_count;
1139
1140 if (brq->data.blocks > 1) {
1141 /*
1142 * After a read error, we redo the request one sector
1143 * at a time in order to accurately determine which
1144 * sectors can be read successfully.
1145 */
1146 if (disable_multi)
1147 brq->data.blocks = 1;
1148
1149 /* Some controllers can't do multiblock reads due to hw bugs */
1150 if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
1151 rq_data_dir(req) == READ)
1152 brq->data.blocks = 1;
1153 }
1154
1155 if (brq->data.blocks > 1 || do_rel_wr) {
1156 /* SPI multiblock writes terminate using a special
1157 * token, not a STOP_TRANSMISSION request.
1158 */
1159 if (!mmc_host_is_spi(card->host) ||
1160 rq_data_dir(req) == READ)
1161 brq->mrq.stop = &brq->stop;
1162 readcmd = MMC_READ_MULTIPLE_BLOCK;
1163 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1164 } else {
1165 brq->mrq.stop = NULL;
1166 readcmd = MMC_READ_SINGLE_BLOCK;
1167 writecmd = MMC_WRITE_BLOCK;
1168 }
1169 if (rq_data_dir(req) == READ) {
1170 brq->cmd.opcode = readcmd;
1171 brq->data.flags |= MMC_DATA_READ;
1172 } else {
1173 brq->cmd.opcode = writecmd;
1174 brq->data.flags |= MMC_DATA_WRITE;
1175 }
1176
1177 if (do_rel_wr)
1178 mmc_apply_rel_rw(brq, card, req);
1179
1180 /*
1181 * Data tag is used only during writing meta data to speed
1182 * up write and any subsequent read of this meta data
1183 */
1184 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1185 (req->cmd_flags & REQ_META) &&
1186 (rq_data_dir(req) == WRITE) &&
1187 ((brq->data.blocks * brq->data.blksz) >=
1188 card->ext_csd.data_tag_unit_size);
1189
1190 /*
1191 * Pre-defined multi-block transfers are preferable to
1192 * open ended-ones (and necessary for reliable writes).
1193 * However, it is not sufficient to just send CMD23,
1194 * and avoid the final CMD12, as on an error condition
1195 * CMD12 (stop) needs to be sent anyway. This, coupled
1196 * with Auto-CMD23 enhancements provided by some
1197 * hosts, means that the complexity of dealing
1198 * with this is best left to the host. If CMD23 is
1199 * supported by card and host, we'll fill sbc in and let
1200 * the host deal with handling it correctly. This means
1201 * that for hosts that don't expose MMC_CAP_CMD23, no
1202 * change of behavior will be observed.
1203 *
1204 * N.B: Some MMC cards experience perf degradation.
1205 * We'll avoid using CMD23-bounded multiblock writes for
1206 * these, while retaining features like reliable writes.
1207 */
1208 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1209 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1210 do_data_tag)) {
1211 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1212 brq->sbc.arg = brq->data.blocks |
1213 (do_rel_wr ? (1 << 31) : 0) |
1214 (do_data_tag ? (1 << 29) : 0);
1215 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1216 brq->mrq.sbc = &brq->sbc;
1217 }
1218
1219 mmc_set_data_timeout(&brq->data, card);
1220
1221 brq->data.sg = mqrq->sg;
1222 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1223
1224 /*
1225 * Adjust the sg list so it is the same size as the
1226 * request.
1227 */
1228 if (brq->data.blocks != blk_rq_sectors(req)) {
1229 int i, data_size = brq->data.blocks << 9;
1230 struct scatterlist *sg;
1231
1232 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1233 data_size -= sg->length;
1234 if (data_size <= 0) {
1235 sg->length += data_size;
1236 i++;
1237 break;
1238 }
1239 }
1240 brq->data.sg_len = i;
1241 }
1242
1243 mqrq->mmc_active.mrq = &brq->mrq;
1244 mqrq->mmc_active.err_check = mmc_blk_err_check;
1245
1246 mmc_queue_bounce_pre(mqrq);
1247 }
1248
1249 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1250 struct mmc_blk_request *brq, struct request *req,
1251 int ret)
1252 {
1253 /*
1254 * If this is an SD card and we're writing, we can first
1255 * mark the known good sectors as ok.
1256 *
1257 * If the card is not SD, we can still ok written sectors
1258 * as reported by the controller (which might be less than
1259 * the real number of written sectors, but never more).
1260 */
1261 if (mmc_card_sd(card)) {
1262 u32 blocks;
1263
1264 blocks = mmc_sd_num_wr_blocks(card);
1265 if (blocks != (u32)-1) {
1266 spin_lock_irq(&md->lock);
1267 ret = __blk_end_request(req, 0, blocks << 9);
1268 spin_unlock_irq(&md->lock);
1269 }
1270 } else {
1271 spin_lock_irq(&md->lock);
1272 ret = __blk_end_request(req, 0, brq->data.bytes_xfered);
1273 spin_unlock_irq(&md->lock);
1274 }
1275 return ret;
1276 }
1277
1278 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1279 {
1280 struct mmc_blk_data *md = mq->data;
1281 struct mmc_card *card = md->queue.card;
1282 struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1283 int ret = 1, disable_multi = 0, retry = 0, type;
1284 enum mmc_blk_status status;
1285 struct mmc_queue_req *mq_rq;
1286 struct request *req;
1287 struct mmc_async_req *areq;
1288
1289 if (!rqc && !mq->mqrq_prev->req)
1290 return 0;
1291
1292 do {
1293 if (rqc) {
1294 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1295 areq = &mq->mqrq_cur->mmc_active;
1296 } else
1297 areq = NULL;
1298 areq = mmc_start_req(card->host, areq, (int *) &status);
1299 if (!areq)
1300 return 0;
1301
1302 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1303 brq = &mq_rq->brq;
1304 req = mq_rq->req;
1305 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1306 mmc_queue_bounce_post(mq_rq);
1307
1308 switch (status) {
1309 case MMC_BLK_SUCCESS:
1310 case MMC_BLK_PARTIAL:
1311 /*
1312 * A block was successfully transferred.
1313 */
1314 mmc_blk_reset_success(md, type);
1315 spin_lock_irq(&md->lock);
1316 ret = __blk_end_request(req, 0,
1317 brq->data.bytes_xfered);
1318 spin_unlock_irq(&md->lock);
1319 /*
1320 * If the blk_end_request function returns non-zero even
1321 * though all data has been transferred and no errors
1322 * were returned by the host controller, it's a bug.
1323 */
1324 if (status == MMC_BLK_SUCCESS && ret) {
1325 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1326 __func__, blk_rq_bytes(req),
1327 brq->data.bytes_xfered);
1328 rqc = NULL;
1329 goto cmd_abort;
1330 }
1331 break;
1332 case MMC_BLK_CMD_ERR:
1333 ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1334 if (!mmc_blk_reset(md, card->host, type))
1335 break;
1336 goto cmd_abort;
1337 case MMC_BLK_RETRY:
1338 if (retry++ < 5)
1339 break;
1340 /* Fall through */
1341 case MMC_BLK_ABORT:
1342 if (!mmc_blk_reset(md, card->host, type))
1343 break;
1344 goto cmd_abort;
1345 case MMC_BLK_DATA_ERR: {
1346 int err;
1347
1348 err = mmc_blk_reset(md, card->host, type);
1349 if (!err)
1350 break;
1351 if (err == -ENODEV)
1352 goto cmd_abort;
1353 /* Fall through */
1354 }
1355 case MMC_BLK_ECC_ERR:
1356 if (brq->data.blocks > 1) {
1357 /* Redo read one sector at a time */
1358 pr_warning("%s: retrying using single block read\n",
1359 req->rq_disk->disk_name);
1360 disable_multi = 1;
1361 break;
1362 }
1363 /*
1364 * After an error, we redo I/O one sector at a
1365 * time, so we only reach here after trying to
1366 * read a single sector.
1367 */
1368 spin_lock_irq(&md->lock);
1369 ret = __blk_end_request(req, -EIO,
1370 brq->data.blksz);
1371 spin_unlock_irq(&md->lock);
1372 if (!ret)
1373 goto start_new_req;
1374 break;
1375 case MMC_BLK_NOMEDIUM:
1376 goto cmd_abort;
1377 }
1378
1379 if (ret) {
1380 /*
1381 * In case of a incomplete request
1382 * prepare it again and resend.
1383 */
1384 mmc_blk_rw_rq_prep(mq_rq, card, disable_multi, mq);
1385 mmc_start_req(card->host, &mq_rq->mmc_active, NULL);
1386 }
1387 } while (ret);
1388
1389 return 1;
1390
1391 cmd_abort:
1392 spin_lock_irq(&md->lock);
1393 if (mmc_card_removed(card))
1394 req->cmd_flags |= REQ_QUIET;
1395 while (ret)
1396 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
1397 spin_unlock_irq(&md->lock);
1398
1399 start_new_req:
1400 if (rqc) {
1401 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1402 mmc_start_req(card->host, &mq->mqrq_cur->mmc_active, NULL);
1403 }
1404
1405 return 0;
1406 }
1407
1408 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1409 {
1410 int ret;
1411 struct mmc_blk_data *md = mq->data;
1412 struct mmc_card *card = md->queue.card;
1413
1414 if (req && !mq->mqrq_prev->req)
1415 /* claim host only for the first request */
1416 mmc_claim_host(card->host);
1417
1418 ret = mmc_blk_part_switch(card, md);
1419 if (ret) {
1420 if (req) {
1421 spin_lock_irq(&md->lock);
1422 __blk_end_request_all(req, -EIO);
1423 spin_unlock_irq(&md->lock);
1424 }
1425 ret = 0;
1426 goto out;
1427 }
1428
1429 if (req && req->cmd_flags & REQ_DISCARD) {
1430 /* complete ongoing async transfer before issuing discard */
1431 if (card->host->areq)
1432 mmc_blk_issue_rw_rq(mq, NULL);
1433 if (req->cmd_flags & REQ_SECURE)
1434 ret = mmc_blk_issue_secdiscard_rq(mq, req);
1435 else
1436 ret = mmc_blk_issue_discard_rq(mq, req);
1437 } else if (req && req->cmd_flags & REQ_FLUSH) {
1438 /* complete ongoing async transfer before issuing flush */
1439 if (card->host->areq)
1440 mmc_blk_issue_rw_rq(mq, NULL);
1441 ret = mmc_blk_issue_flush(mq, req);
1442 } else {
1443 ret = mmc_blk_issue_rw_rq(mq, req);
1444 }
1445
1446 out:
1447 if (!req)
1448 /* release host only when there are no more requests */
1449 mmc_release_host(card->host);
1450 return ret;
1451 }
1452
1453 static inline int mmc_blk_readonly(struct mmc_card *card)
1454 {
1455 return mmc_card_readonly(card) ||
1456 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
1457 }
1458
1459 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
1460 struct device *parent,
1461 sector_t size,
1462 bool default_ro,
1463 const char *subname,
1464 int area_type)
1465 {
1466 struct mmc_blk_data *md;
1467 int devidx, ret;
1468
1469 devidx = find_first_zero_bit(dev_use, max_devices);
1470 if (devidx >= max_devices)
1471 return ERR_PTR(-ENOSPC);
1472 __set_bit(devidx, dev_use);
1473
1474 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
1475 if (!md) {
1476 ret = -ENOMEM;
1477 goto out;
1478 }
1479
1480 /*
1481 * !subname implies we are creating main mmc_blk_data that will be
1482 * associated with mmc_card with mmc_set_drvdata. Due to device
1483 * partitions, devidx will not coincide with a per-physical card
1484 * index anymore so we keep track of a name index.
1485 */
1486 if (!subname) {
1487 md->name_idx = find_first_zero_bit(name_use, max_devices);
1488 __set_bit(md->name_idx, name_use);
1489 } else
1490 md->name_idx = ((struct mmc_blk_data *)
1491 dev_to_disk(parent)->private_data)->name_idx;
1492
1493 md->area_type = area_type;
1494
1495 /*
1496 * Set the read-only status based on the supported commands
1497 * and the write protect switch.
1498 */
1499 md->read_only = mmc_blk_readonly(card);
1500
1501 md->disk = alloc_disk(perdev_minors);
1502 if (md->disk == NULL) {
1503 ret = -ENOMEM;
1504 goto err_kfree;
1505 }
1506
1507 spin_lock_init(&md->lock);
1508 INIT_LIST_HEAD(&md->part);
1509 md->usage = 1;
1510
1511 ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
1512 if (ret)
1513 goto err_putdisk;
1514
1515 md->queue.issue_fn = mmc_blk_issue_rq;
1516 md->queue.data = md;
1517
1518 md->disk->major = MMC_BLOCK_MAJOR;
1519 md->disk->first_minor = devidx * perdev_minors;
1520 md->disk->fops = &mmc_bdops;
1521 md->disk->private_data = md;
1522 md->disk->queue = md->queue.queue;
1523 md->disk->driverfs_dev = parent;
1524 set_disk_ro(md->disk, md->read_only || default_ro);
1525
1526 /*
1527 * As discussed on lkml, GENHD_FL_REMOVABLE should:
1528 *
1529 * - be set for removable media with permanent block devices
1530 * - be unset for removable block devices with permanent media
1531 *
1532 * Since MMC block devices clearly fall under the second
1533 * case, we do not set GENHD_FL_REMOVABLE. Userspace
1534 * should use the block device creation/destruction hotplug
1535 * messages to tell when the card is present.
1536 */
1537
1538 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
1539 "mmcblk%d%s", md->name_idx, subname ? subname : "");
1540
1541 blk_queue_logical_block_size(md->queue.queue, 512);
1542 set_capacity(md->disk, size);
1543
1544 if (mmc_host_cmd23(card->host)) {
1545 if (mmc_card_mmc(card) ||
1546 (mmc_card_sd(card) &&
1547 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
1548 md->flags |= MMC_BLK_CMD23;
1549 }
1550
1551 if (mmc_card_mmc(card) &&
1552 md->flags & MMC_BLK_CMD23 &&
1553 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
1554 card->ext_csd.rel_sectors)) {
1555 md->flags |= MMC_BLK_REL_WR;
1556 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
1557 }
1558
1559 return md;
1560
1561 err_putdisk:
1562 put_disk(md->disk);
1563 err_kfree:
1564 kfree(md);
1565 out:
1566 return ERR_PTR(ret);
1567 }
1568
1569 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
1570 {
1571 sector_t size;
1572 struct mmc_blk_data *md;
1573
1574 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
1575 /*
1576 * The EXT_CSD sector count is in number or 512 byte
1577 * sectors.
1578 */
1579 size = card->ext_csd.sectors;
1580 } else {
1581 /*
1582 * The CSD capacity field is in units of read_blkbits.
1583 * set_capacity takes units of 512 bytes.
1584 */
1585 size = card->csd.capacity << (card->csd.read_blkbits - 9);
1586 }
1587
1588 md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
1589 MMC_BLK_DATA_AREA_MAIN);
1590 return md;
1591 }
1592
1593 static int mmc_blk_alloc_part(struct mmc_card *card,
1594 struct mmc_blk_data *md,
1595 unsigned int part_type,
1596 sector_t size,
1597 bool default_ro,
1598 const char *subname,
1599 int area_type)
1600 {
1601 char cap_str[10];
1602 struct mmc_blk_data *part_md;
1603
1604 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
1605 subname, area_type);
1606 if (IS_ERR(part_md))
1607 return PTR_ERR(part_md);
1608 part_md->part_type = part_type;
1609 list_add(&part_md->part, &md->part);
1610
1611 string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
1612 cap_str, sizeof(cap_str));
1613 pr_info("%s: %s %s partition %u %s\n",
1614 part_md->disk->disk_name, mmc_card_id(card),
1615 mmc_card_name(card), part_md->part_type, cap_str);
1616 return 0;
1617 }
1618
1619 /* MMC Physical partitions consist of two boot partitions and
1620 * up to four general purpose partitions.
1621 * For each partition enabled in EXT_CSD a block device will be allocatedi
1622 * to provide access to the partition.
1623 */
1624
1625 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
1626 {
1627 int idx, ret = 0;
1628
1629 if (!mmc_card_mmc(card))
1630 return 0;
1631
1632 for (idx = 0; idx < card->nr_parts; idx++) {
1633 if (card->part[idx].size) {
1634 ret = mmc_blk_alloc_part(card, md,
1635 card->part[idx].part_cfg,
1636 card->part[idx].size >> 9,
1637 card->part[idx].force_ro,
1638 card->part[idx].name,
1639 card->part[idx].area_type);
1640 if (ret)
1641 return ret;
1642 }
1643 }
1644
1645 return ret;
1646 }
1647
1648 static void mmc_blk_remove_req(struct mmc_blk_data *md)
1649 {
1650 struct mmc_card *card;
1651
1652 if (md) {
1653 card = md->queue.card;
1654 if (md->disk->flags & GENHD_FL_UP) {
1655 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
1656 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
1657 card->ext_csd.boot_ro_lockable)
1658 device_remove_file(disk_to_dev(md->disk),
1659 &md->power_ro_lock);
1660
1661 /* Stop new requests from getting into the queue */
1662 del_gendisk(md->disk);
1663 }
1664
1665 /* Then flush out any already in there */
1666 mmc_cleanup_queue(&md->queue);
1667 mmc_blk_put(md);
1668 }
1669 }
1670
1671 static void mmc_blk_remove_parts(struct mmc_card *card,
1672 struct mmc_blk_data *md)
1673 {
1674 struct list_head *pos, *q;
1675 struct mmc_blk_data *part_md;
1676
1677 __clear_bit(md->name_idx, name_use);
1678 list_for_each_safe(pos, q, &md->part) {
1679 part_md = list_entry(pos, struct mmc_blk_data, part);
1680 list_del(pos);
1681 mmc_blk_remove_req(part_md);
1682 }
1683 }
1684
1685 static int mmc_add_disk(struct mmc_blk_data *md)
1686 {
1687 int ret;
1688 struct mmc_card *card = md->queue.card;
1689
1690 add_disk(md->disk);
1691 md->force_ro.show = force_ro_show;
1692 md->force_ro.store = force_ro_store;
1693 sysfs_attr_init(&md->force_ro.attr);
1694 md->force_ro.attr.name = "force_ro";
1695 md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
1696 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
1697 if (ret)
1698 goto force_ro_fail;
1699
1700 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
1701 card->ext_csd.boot_ro_lockable) {
1702 umode_t mode;
1703
1704 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
1705 mode = S_IRUGO;
1706 else
1707 mode = S_IRUGO | S_IWUSR;
1708
1709 md->power_ro_lock.show = power_ro_lock_show;
1710 md->power_ro_lock.store = power_ro_lock_store;
1711 sysfs_attr_init(&md->power_ro_lock.attr);
1712 md->power_ro_lock.attr.mode = mode;
1713 md->power_ro_lock.attr.name =
1714 "ro_lock_until_next_power_on";
1715 ret = device_create_file(disk_to_dev(md->disk),
1716 &md->power_ro_lock);
1717 if (ret)
1718 goto power_ro_lock_fail;
1719 }
1720 return ret;
1721
1722 power_ro_lock_fail:
1723 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
1724 force_ro_fail:
1725 del_gendisk(md->disk);
1726
1727 return ret;
1728 }
1729
1730 #define CID_MANFID_SANDISK 0x2
1731 #define CID_MANFID_TOSHIBA 0x11
1732 #define CID_MANFID_MICRON 0x13
1733
1734 static const struct mmc_fixup blk_fixups[] =
1735 {
1736 MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
1737 MMC_QUIRK_INAND_CMD38),
1738 MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
1739 MMC_QUIRK_INAND_CMD38),
1740 MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
1741 MMC_QUIRK_INAND_CMD38),
1742 MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
1743 MMC_QUIRK_INAND_CMD38),
1744 MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
1745 MMC_QUIRK_INAND_CMD38),
1746
1747 /*
1748 * Some MMC cards experience performance degradation with CMD23
1749 * instead of CMD12-bounded multiblock transfers. For now we'll
1750 * black list what's bad...
1751 * - Certain Toshiba cards.
1752 *
1753 * N.B. This doesn't affect SD cards.
1754 */
1755 MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
1756 MMC_QUIRK_BLK_NO_CMD23),
1757 MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
1758 MMC_QUIRK_BLK_NO_CMD23),
1759 MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
1760 MMC_QUIRK_BLK_NO_CMD23),
1761
1762 /*
1763 * Some Micron MMC cards needs longer data read timeout than
1764 * indicated in CSD.
1765 */
1766 MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
1767 MMC_QUIRK_LONG_READ_TIME),
1768
1769 END_FIXUP
1770 };
1771
1772 static int mmc_blk_probe(struct mmc_card *card)
1773 {
1774 struct mmc_blk_data *md, *part_md;
1775 char cap_str[10];
1776
1777 /*
1778 * Check that the card supports the command class(es) we need.
1779 */
1780 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
1781 return -ENODEV;
1782
1783 md = mmc_blk_alloc(card);
1784 if (IS_ERR(md))
1785 return PTR_ERR(md);
1786
1787 string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
1788 cap_str, sizeof(cap_str));
1789 pr_info("%s: %s %s %s %s\n",
1790 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
1791 cap_str, md->read_only ? "(ro)" : "");
1792
1793 if (mmc_blk_alloc_parts(card, md))
1794 goto out;
1795
1796 mmc_set_drvdata(card, md);
1797 mmc_fixup_device(card, blk_fixups);
1798
1799 if (mmc_add_disk(md))
1800 goto out;
1801
1802 list_for_each_entry(part_md, &md->part, part) {
1803 if (mmc_add_disk(part_md))
1804 goto out;
1805 }
1806 return 0;
1807
1808 out:
1809 mmc_blk_remove_parts(card, md);
1810 mmc_blk_remove_req(md);
1811 return 0;
1812 }
1813
1814 static void mmc_blk_remove(struct mmc_card *card)
1815 {
1816 struct mmc_blk_data *md = mmc_get_drvdata(card);
1817
1818 mmc_blk_remove_parts(card, md);
1819 mmc_claim_host(card->host);
1820 mmc_blk_part_switch(card, md);
1821 mmc_release_host(card->host);
1822 mmc_blk_remove_req(md);
1823 mmc_set_drvdata(card, NULL);
1824 }
1825
1826 #ifdef CONFIG_PM
1827 static int mmc_blk_suspend(struct mmc_card *card)
1828 {
1829 struct mmc_blk_data *part_md;
1830 struct mmc_blk_data *md = mmc_get_drvdata(card);
1831
1832 if (md) {
1833 mmc_queue_suspend(&md->queue);
1834 list_for_each_entry(part_md, &md->part, part) {
1835 mmc_queue_suspend(&part_md->queue);
1836 }
1837 }
1838 return 0;
1839 }
1840
1841 static int mmc_blk_resume(struct mmc_card *card)
1842 {
1843 struct mmc_blk_data *part_md;
1844 struct mmc_blk_data *md = mmc_get_drvdata(card);
1845
1846 if (md) {
1847 /*
1848 * Resume involves the card going into idle state,
1849 * so current partition is always the main one.
1850 */
1851 md->part_curr = md->part_type;
1852 mmc_queue_resume(&md->queue);
1853 list_for_each_entry(part_md, &md->part, part) {
1854 mmc_queue_resume(&part_md->queue);
1855 }
1856 }
1857 return 0;
1858 }
1859 #else
1860 #define mmc_blk_suspend NULL
1861 #define mmc_blk_resume NULL
1862 #endif
1863
1864 static struct mmc_driver mmc_driver = {
1865 .drv = {
1866 .name = "mmcblk",
1867 },
1868 .probe = mmc_blk_probe,
1869 .remove = mmc_blk_remove,
1870 .suspend = mmc_blk_suspend,
1871 .resume = mmc_blk_resume,
1872 };
1873
1874 static int __init mmc_blk_init(void)
1875 {
1876 int res;
1877
1878 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
1879 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
1880
1881 max_devices = 256 / perdev_minors;
1882
1883 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
1884 if (res)
1885 goto out;
1886
1887 res = mmc_register_driver(&mmc_driver);
1888 if (res)
1889 goto out2;
1890
1891 return 0;
1892 out2:
1893 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1894 out:
1895 return res;
1896 }
1897
1898 static void __exit mmc_blk_exit(void)
1899 {
1900 mmc_unregister_driver(&mmc_driver);
1901 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1902 }
1903
1904 module_init(mmc_blk_init);
1905 module_exit(mmc_blk_exit);
1906
1907 MODULE_LICENSE("GPL");
1908 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
1909
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