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Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux-2.6.git] / drivers / mmc / card / block.c
blob276d21ce6bc1ba6a18c844258331d6417f6278d7
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_err;
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 cmd_err:
487 kfree(idata->buf);
488 kfree(idata);
489 return err;
490 }
491
492 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
493 unsigned int cmd, unsigned long arg)
494 {
495 int ret = -EINVAL;
496 if (cmd == MMC_IOC_CMD)
497 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
498 return ret;
499 }
500
501 #ifdef CONFIG_COMPAT
502 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
503 unsigned int cmd, unsigned long arg)
504 {
505 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
506 }
507 #endif
508
509 static const struct block_device_operations mmc_bdops = {
510 .open = mmc_blk_open,
511 .release = mmc_blk_release,
512 .getgeo = mmc_blk_getgeo,
513 .owner = THIS_MODULE,
514 .ioctl = mmc_blk_ioctl,
515 #ifdef CONFIG_COMPAT
516 .compat_ioctl = mmc_blk_compat_ioctl,
517 #endif
518 };
519
520 static inline int mmc_blk_part_switch(struct mmc_card *card,
521 struct mmc_blk_data *md)
522 {
523 int ret;
524 struct mmc_blk_data *main_md = mmc_get_drvdata(card);
525
526 if (main_md->part_curr == md->part_type)
527 return 0;
528
529 if (mmc_card_mmc(card)) {
530 u8 part_config = card->ext_csd.part_config;
531
532 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
533 part_config |= md->part_type;
534
535 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
536 EXT_CSD_PART_CONFIG, part_config,
537 card->ext_csd.part_time);
538 if (ret)
539 return ret;
540
541 card->ext_csd.part_config = part_config;
542 }
543
544 main_md->part_curr = md->part_type;
545 return 0;
546 }
547
548 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
549 {
550 int err;
551 u32 result;
552 __be32 *blocks;
553
554 struct mmc_request mrq = {NULL};
555 struct mmc_command cmd = {0};
556 struct mmc_data data = {0};
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.blksz = 4;
577 data.blocks = 1;
578 data.flags = MMC_DATA_READ;
579 data.sg = &sg;
580 data.sg_len = 1;
581 mmc_set_data_timeout(&data, card);
582
583 mrq.cmd = &cmd;
584 mrq.data = &data;
585
586 blocks = kmalloc(4, GFP_KERNEL);
587 if (!blocks)
588 return (u32)-1;
589
590 sg_init_one(&sg, blocks, 4);
591
592 mmc_wait_for_req(card->host, &mrq);
593
594 result = ntohl(*blocks);
595 kfree(blocks);
596
597 if (cmd.error || data.error)
598 result = (u32)-1;
599
600 return result;
601 }
602
603 static int send_stop(struct mmc_card *card, u32 *status)
604 {
605 struct mmc_command cmd = {0};
606 int err;
607
608 cmd.opcode = MMC_STOP_TRANSMISSION;
609 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
610 err = mmc_wait_for_cmd(card->host, &cmd, 5);
611 if (err == 0)
612 *status = cmd.resp[0];
613 return err;
614 }
615
616 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
617 {
618 struct mmc_command cmd = {0};
619 int err;
620
621 cmd.opcode = MMC_SEND_STATUS;
622 if (!mmc_host_is_spi(card->host))
623 cmd.arg = card->rca << 16;
624 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
625 err = mmc_wait_for_cmd(card->host, &cmd, retries);
626 if (err == 0)
627 *status = cmd.resp[0];
628 return err;
629 }
630
631 #define ERR_NOMEDIUM 3
632 #define ERR_RETRY 2
633 #define ERR_ABORT 1
634 #define ERR_CONTINUE 0
635
636 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
637 bool status_valid, u32 status)
638 {
639 switch (error) {
640 case -EILSEQ:
641 /* response crc error, retry the r/w cmd */
642 pr_err("%s: %s sending %s command, card status %#x\n",
643 req->rq_disk->disk_name, "response CRC error",
644 name, status);
645 return ERR_RETRY;
646
647 case -ETIMEDOUT:
648 pr_err("%s: %s sending %s command, card status %#x\n",
649 req->rq_disk->disk_name, "timed out", name, status);
650
651 /* If the status cmd initially failed, retry the r/w cmd */
652 if (!status_valid)
653 return ERR_RETRY;
654
655 /*
656 * If it was a r/w cmd crc error, or illegal command
657 * (eg, issued in wrong state) then retry - we should
658 * have corrected the state problem above.
659 */
660 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
661 return ERR_RETRY;
662
663 /* Otherwise abort the command */
664 return ERR_ABORT;
665
666 default:
667 /* We don't understand the error code the driver gave us */
668 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
669 req->rq_disk->disk_name, error, status);
670 return ERR_ABORT;
671 }
672 }
673
674 /*
675 * Initial r/w and stop cmd error recovery.
676 * We don't know whether the card received the r/w cmd or not, so try to
677 * restore things back to a sane state. Essentially, we do this as follows:
678 * - Obtain card status. If the first attempt to obtain card status fails,
679 * the status word will reflect the failed status cmd, not the failed
680 * r/w cmd. If we fail to obtain card status, it suggests we can no
681 * longer communicate with the card.
682 * - Check the card state. If the card received the cmd but there was a
683 * transient problem with the response, it might still be in a data transfer
684 * mode. Try to send it a stop command. If this fails, we can't recover.
685 * - If the r/w cmd failed due to a response CRC error, it was probably
686 * transient, so retry the cmd.
687 * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
688 * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
689 * illegal cmd, retry.
690 * Otherwise we don't understand what happened, so abort.
691 */
692 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
693 struct mmc_blk_request *brq, int *ecc_err)
694 {
695 bool prev_cmd_status_valid = true;
696 u32 status, stop_status = 0;
697 int err, retry;
698
699 if (mmc_card_removed(card))
700 return ERR_NOMEDIUM;
701
702 /*
703 * Try to get card status which indicates both the card state
704 * and why there was no response. If the first attempt fails,
705 * we can't be sure the returned status is for the r/w command.
706 */
707 for (retry = 2; retry >= 0; retry--) {
708 err = get_card_status(card, &status, 0);
709 if (!err)
710 break;
711
712 prev_cmd_status_valid = false;
713 pr_err("%s: error %d sending status command, %sing\n",
714 req->rq_disk->disk_name, err, retry ? "retry" : "abort");
715 }
716
717 /* We couldn't get a response from the card. Give up. */
718 if (err) {
719 /* Check if the card is removed */
720 if (mmc_detect_card_removed(card->host))
721 return ERR_NOMEDIUM;
722 return ERR_ABORT;
723 }
724
725 /* Flag ECC errors */
726 if ((status & R1_CARD_ECC_FAILED) ||
727 (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
728 (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
729 *ecc_err = 1;
730
731 /*
732 * Check the current card state. If it is in some data transfer
733 * mode, tell it to stop (and hopefully transition back to TRAN.)
734 */
735 if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
736 R1_CURRENT_STATE(status) == R1_STATE_RCV) {
737 err = send_stop(card, &stop_status);
738 if (err)
739 pr_err("%s: error %d sending stop command\n",
740 req->rq_disk->disk_name, err);
741
742 /*
743 * If the stop cmd also timed out, the card is probably
744 * not present, so abort. Other errors are bad news too.
745 */
746 if (err)
747 return ERR_ABORT;
748 if (stop_status & R1_CARD_ECC_FAILED)
749 *ecc_err = 1;
750 }
751
752 /* Check for set block count errors */
753 if (brq->sbc.error)
754 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
755 prev_cmd_status_valid, status);
756
757 /* Check for r/w command errors */
758 if (brq->cmd.error)
759 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
760 prev_cmd_status_valid, status);
761
762 /* Data errors */
763 if (!brq->stop.error)
764 return ERR_CONTINUE;
765
766 /* Now for stop errors. These aren't fatal to the transfer. */
767 pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
768 req->rq_disk->disk_name, brq->stop.error,
769 brq->cmd.resp[0], status);
770
771 /*
772 * Subsitute in our own stop status as this will give the error
773 * state which happened during the execution of the r/w command.
774 */
775 if (stop_status) {
776 brq->stop.resp[0] = stop_status;
777 brq->stop.error = 0;
778 }
779 return ERR_CONTINUE;
780 }
781
782 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
783 int type)
784 {
785 int err;
786
787 if (md->reset_done & type)
788 return -EEXIST;
789
790 md->reset_done |= type;
791 err = mmc_hw_reset(host);
792 /* Ensure we switch back to the correct partition */
793 if (err != -EOPNOTSUPP) {
794 struct mmc_blk_data *main_md = mmc_get_drvdata(host->card);
795 int part_err;
796
797 main_md->part_curr = main_md->part_type;
798 part_err = mmc_blk_part_switch(host->card, md);
799 if (part_err) {
800 /*
801 * We have failed to get back into the correct
802 * partition, so we need to abort the whole request.
803 */
804 return -ENODEV;
805 }
806 }
807 return err;
808 }
809
810 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
811 {
812 md->reset_done &= ~type;
813 }
814
815 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
816 {
817 struct mmc_blk_data *md = mq->data;
818 struct mmc_card *card = md->queue.card;
819 unsigned int from, nr, arg;
820 int err = 0, type = MMC_BLK_DISCARD;
821
822 if (!mmc_can_erase(card)) {
823 err = -EOPNOTSUPP;
824 goto out;
825 }
826
827 from = blk_rq_pos(req);
828 nr = blk_rq_sectors(req);
829
830 if (mmc_can_discard(card))
831 arg = MMC_DISCARD_ARG;
832 else if (mmc_can_trim(card))
833 arg = MMC_TRIM_ARG;
834 else
835 arg = MMC_ERASE_ARG;
836 retry:
837 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
838 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
839 INAND_CMD38_ARG_EXT_CSD,
840 arg == MMC_TRIM_ARG ?
841 INAND_CMD38_ARG_TRIM :
842 INAND_CMD38_ARG_ERASE,
843 0);
844 if (err)
845 goto out;
846 }
847 err = mmc_erase(card, from, nr, arg);
848 out:
849 if (err == -EIO && !mmc_blk_reset(md, card->host, type))
850 goto retry;
851 if (!err)
852 mmc_blk_reset_success(md, type);
853 spin_lock_irq(&md->lock);
854 __blk_end_request(req, err, blk_rq_bytes(req));
855 spin_unlock_irq(&md->lock);
856
857 return err ? 0 : 1;
858 }
859
860 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
861 struct request *req)
862 {
863 struct mmc_blk_data *md = mq->data;
864 struct mmc_card *card = md->queue.card;
865 unsigned int from, nr, arg, trim_arg, erase_arg;
866 int err = 0, type = MMC_BLK_SECDISCARD;
867
868 if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
869 err = -EOPNOTSUPP;
870 goto out;
871 }
872
873 from = blk_rq_pos(req);
874 nr = blk_rq_sectors(req);
875
876 /* The sanitize operation is supported at v4.5 only */
877 if (mmc_can_sanitize(card)) {
878 erase_arg = MMC_ERASE_ARG;
879 trim_arg = MMC_TRIM_ARG;
880 } else {
881 erase_arg = MMC_SECURE_ERASE_ARG;
882 trim_arg = MMC_SECURE_TRIM1_ARG;
883 }
884
885 if (mmc_erase_group_aligned(card, from, nr))
886 arg = erase_arg;
887 else if (mmc_can_trim(card))
888 arg = trim_arg;
889 else {
890 err = -EINVAL;
891 goto out;
892 }
893 retry:
894 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
895 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
896 INAND_CMD38_ARG_EXT_CSD,
897 arg == MMC_SECURE_TRIM1_ARG ?
898 INAND_CMD38_ARG_SECTRIM1 :
899 INAND_CMD38_ARG_SECERASE,
900 0);
901 if (err)
902 goto out_retry;
903 }
904
905 err = mmc_erase(card, from, nr, arg);
906 if (err == -EIO)
907 goto out_retry;
908 if (err)
909 goto out;
910
911 if (arg == MMC_SECURE_TRIM1_ARG) {
912 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
913 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
914 INAND_CMD38_ARG_EXT_CSD,
915 INAND_CMD38_ARG_SECTRIM2,
916 0);
917 if (err)
918 goto out_retry;
919 }
920
921 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
922 if (err == -EIO)
923 goto out_retry;
924 if (err)
925 goto out;
926 }
927
928 if (mmc_can_sanitize(card))
929 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
930 EXT_CSD_SANITIZE_START, 1, 0);
931 out_retry:
932 if (err && !mmc_blk_reset(md, card->host, type))
933 goto retry;
934 if (!err)
935 mmc_blk_reset_success(md, type);
936 out:
937 spin_lock_irq(&md->lock);
938 __blk_end_request(req, err, blk_rq_bytes(req));
939 spin_unlock_irq(&md->lock);
940
941 return err ? 0 : 1;
942 }
943
944 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
945 {
946 struct mmc_blk_data *md = mq->data;
947 struct mmc_card *card = md->queue.card;
948 int ret = 0;
949
950 ret = mmc_flush_cache(card);
951 if (ret)
952 ret = -EIO;
953
954 spin_lock_irq(&md->lock);
955 __blk_end_request_all(req, ret);
956 spin_unlock_irq(&md->lock);
957
958 return ret ? 0 : 1;
959 }
960
961 /*
962 * Reformat current write as a reliable write, supporting
963 * both legacy and the enhanced reliable write MMC cards.
964 * In each transfer we'll handle only as much as a single
965 * reliable write can handle, thus finish the request in
966 * partial completions.
967 */
968 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
969 struct mmc_card *card,
970 struct request *req)
971 {
972 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
973 /* Legacy mode imposes restrictions on transfers. */
974 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
975 brq->data.blocks = 1;
976
977 if (brq->data.blocks > card->ext_csd.rel_sectors)
978 brq->data.blocks = card->ext_csd.rel_sectors;
979 else if (brq->data.blocks < card->ext_csd.rel_sectors)
980 brq->data.blocks = 1;
981 }
982 }
983
984 #define CMD_ERRORS \
985 (R1_OUT_OF_RANGE | /* Command argument out of range */ \
986 R1_ADDRESS_ERROR | /* Misaligned address */ \
987 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
988 R1_WP_VIOLATION | /* Tried to write to protected block */ \
989 R1_CC_ERROR | /* Card controller error */ \
990 R1_ERROR) /* General/unknown error */
991
992 static int mmc_blk_err_check(struct mmc_card *card,
993 struct mmc_async_req *areq)
994 {
995 struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
996 mmc_active);
997 struct mmc_blk_request *brq = &mq_mrq->brq;
998 struct request *req = mq_mrq->req;
999 int ecc_err = 0;
1000
1001 /*
1002 * sbc.error indicates a problem with the set block count
1003 * command. No data will have been transferred.
1004 *
1005 * cmd.error indicates a problem with the r/w command. No
1006 * data will have been transferred.
1007 *
1008 * stop.error indicates a problem with the stop command. Data
1009 * may have been transferred, or may still be transferring.
1010 */
1011 if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1012 brq->data.error) {
1013 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err)) {
1014 case ERR_RETRY:
1015 return MMC_BLK_RETRY;
1016 case ERR_ABORT:
1017 return MMC_BLK_ABORT;
1018 case ERR_NOMEDIUM:
1019 return MMC_BLK_NOMEDIUM;
1020 case ERR_CONTINUE:
1021 break;
1022 }
1023 }
1024
1025 /*
1026 * Check for errors relating to the execution of the
1027 * initial command - such as address errors. No data
1028 * has been transferred.
1029 */
1030 if (brq->cmd.resp[0] & CMD_ERRORS) {
1031 pr_err("%s: r/w command failed, status = %#x\n",
1032 req->rq_disk->disk_name, brq->cmd.resp[0]);
1033 return MMC_BLK_ABORT;
1034 }
1035
1036 /*
1037 * Everything else is either success, or a data error of some
1038 * kind. If it was a write, we may have transitioned to
1039 * program mode, which we have to wait for it to complete.
1040 */
1041 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1042 u32 status;
1043 do {
1044 int err = get_card_status(card, &status, 5);
1045 if (err) {
1046 pr_err("%s: error %d requesting status\n",
1047 req->rq_disk->disk_name, err);
1048 return MMC_BLK_CMD_ERR;
1049 }
1050 /*
1051 * Some cards mishandle the status bits,
1052 * so make sure to check both the busy
1053 * indication and the card state.
1054 */
1055 } while (!(status & R1_READY_FOR_DATA) ||
1056 (R1_CURRENT_STATE(status) == R1_STATE_PRG));
1057 }
1058
1059 if (brq->data.error) {
1060 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1061 req->rq_disk->disk_name, brq->data.error,
1062 (unsigned)blk_rq_pos(req),
1063 (unsigned)blk_rq_sectors(req),
1064 brq->cmd.resp[0], brq->stop.resp[0]);
1065
1066 if (rq_data_dir(req) == READ) {
1067 if (ecc_err)
1068 return MMC_BLK_ECC_ERR;
1069 return MMC_BLK_DATA_ERR;
1070 } else {
1071 return MMC_BLK_CMD_ERR;
1072 }
1073 }
1074
1075 if (!brq->data.bytes_xfered)
1076 return MMC_BLK_RETRY;
1077
1078 if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1079 return MMC_BLK_PARTIAL;
1080
1081 return MMC_BLK_SUCCESS;
1082 }
1083
1084 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1085 struct mmc_card *card,
1086 int disable_multi,
1087 struct mmc_queue *mq)
1088 {
1089 u32 readcmd, writecmd;
1090 struct mmc_blk_request *brq = &mqrq->brq;
1091 struct request *req = mqrq->req;
1092 struct mmc_blk_data *md = mq->data;
1093 bool do_data_tag;
1094
1095 /*
1096 * Reliable writes are used to implement Forced Unit Access and
1097 * REQ_META accesses, and are supported only on MMCs.
1098 *
1099 * XXX: this really needs a good explanation of why REQ_META
1100 * is treated special.
1101 */
1102 bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1103 (req->cmd_flags & REQ_META)) &&
1104 (rq_data_dir(req) == WRITE) &&
1105 (md->flags & MMC_BLK_REL_WR);
1106
1107 memset(brq, 0, sizeof(struct mmc_blk_request));
1108 brq->mrq.cmd = &brq->cmd;
1109 brq->mrq.data = &brq->data;
1110
1111 brq->cmd.arg = blk_rq_pos(req);
1112 if (!mmc_card_blockaddr(card))
1113 brq->cmd.arg <<= 9;
1114 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1115 brq->data.blksz = 512;
1116 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1117 brq->stop.arg = 0;
1118 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1119 brq->data.blocks = blk_rq_sectors(req);
1120
1121 /*
1122 * The block layer doesn't support all sector count
1123 * restrictions, so we need to be prepared for too big
1124 * requests.
1125 */
1126 if (brq->data.blocks > card->host->max_blk_count)
1127 brq->data.blocks = card->host->max_blk_count;
1128
1129 if (brq->data.blocks > 1) {
1130 /*
1131 * After a read error, we redo the request one sector
1132 * at a time in order to accurately determine which
1133 * sectors can be read successfully.
1134 */
1135 if (disable_multi)
1136 brq->data.blocks = 1;
1137
1138 /* Some controllers can't do multiblock reads due to hw bugs */
1139 if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
1140 rq_data_dir(req) == READ)
1141 brq->data.blocks = 1;
1142 }
1143
1144 if (brq->data.blocks > 1 || do_rel_wr) {
1145 /* SPI multiblock writes terminate using a special
1146 * token, not a STOP_TRANSMISSION request.
1147 */
1148 if (!mmc_host_is_spi(card->host) ||
1149 rq_data_dir(req) == READ)
1150 brq->mrq.stop = &brq->stop;
1151 readcmd = MMC_READ_MULTIPLE_BLOCK;
1152 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1153 } else {
1154 brq->mrq.stop = NULL;
1155 readcmd = MMC_READ_SINGLE_BLOCK;
1156 writecmd = MMC_WRITE_BLOCK;
1157 }
1158 if (rq_data_dir(req) == READ) {
1159 brq->cmd.opcode = readcmd;
1160 brq->data.flags |= MMC_DATA_READ;
1161 } else {
1162 brq->cmd.opcode = writecmd;
1163 brq->data.flags |= MMC_DATA_WRITE;
1164 }
1165
1166 if (do_rel_wr)
1167 mmc_apply_rel_rw(brq, card, req);
1168
1169 /*
1170 * Data tag is used only during writing meta data to speed
1171 * up write and any subsequent read of this meta data
1172 */
1173 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1174 (req->cmd_flags & REQ_META) &&
1175 (rq_data_dir(req) == WRITE) &&
1176 ((brq->data.blocks * brq->data.blksz) >=
1177 card->ext_csd.data_tag_unit_size);
1178
1179 /*
1180 * Pre-defined multi-block transfers are preferable to
1181 * open ended-ones (and necessary for reliable writes).
1182 * However, it is not sufficient to just send CMD23,
1183 * and avoid the final CMD12, as on an error condition
1184 * CMD12 (stop) needs to be sent anyway. This, coupled
1185 * with Auto-CMD23 enhancements provided by some
1186 * hosts, means that the complexity of dealing
1187 * with this is best left to the host. If CMD23 is
1188 * supported by card and host, we'll fill sbc in and let
1189 * the host deal with handling it correctly. This means
1190 * that for hosts that don't expose MMC_CAP_CMD23, no
1191 * change of behavior will be observed.
1192 *
1193 * N.B: Some MMC cards experience perf degradation.
1194 * We'll avoid using CMD23-bounded multiblock writes for
1195 * these, while retaining features like reliable writes.
1196 */
1197 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1198 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1199 do_data_tag)) {
1200 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1201 brq->sbc.arg = brq->data.blocks |
1202 (do_rel_wr ? (1 << 31) : 0) |
1203 (do_data_tag ? (1 << 29) : 0);
1204 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1205 brq->mrq.sbc = &brq->sbc;
1206 }
1207
1208 mmc_set_data_timeout(&brq->data, card);
1209
1210 brq->data.sg = mqrq->sg;
1211 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1212
1213 /*
1214 * Adjust the sg list so it is the same size as the
1215 * request.
1216 */
1217 if (brq->data.blocks != blk_rq_sectors(req)) {
1218 int i, data_size = brq->data.blocks << 9;
1219 struct scatterlist *sg;
1220
1221 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1222 data_size -= sg->length;
1223 if (data_size <= 0) {
1224 sg->length += data_size;
1225 i++;
1226 break;
1227 }
1228 }
1229 brq->data.sg_len = i;
1230 }
1231
1232 mqrq->mmc_active.mrq = &brq->mrq;
1233 mqrq->mmc_active.err_check = mmc_blk_err_check;
1234
1235 mmc_queue_bounce_pre(mqrq);
1236 }
1237
1238 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1239 struct mmc_blk_request *brq, struct request *req,
1240 int ret)
1241 {
1242 /*
1243 * If this is an SD card and we're writing, we can first
1244 * mark the known good sectors as ok.
1245 *
1246 * If the card is not SD, we can still ok written sectors
1247 * as reported by the controller (which might be less than
1248 * the real number of written sectors, but never more).
1249 */
1250 if (mmc_card_sd(card)) {
1251 u32 blocks;
1252
1253 blocks = mmc_sd_num_wr_blocks(card);
1254 if (blocks != (u32)-1) {
1255 spin_lock_irq(&md->lock);
1256 ret = __blk_end_request(req, 0, blocks << 9);
1257 spin_unlock_irq(&md->lock);
1258 }
1259 } else {
1260 spin_lock_irq(&md->lock);
1261 ret = __blk_end_request(req, 0, brq->data.bytes_xfered);
1262 spin_unlock_irq(&md->lock);
1263 }
1264 return ret;
1265 }
1266
1267 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1268 {
1269 struct mmc_blk_data *md = mq->data;
1270 struct mmc_card *card = md->queue.card;
1271 struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1272 int ret = 1, disable_multi = 0, retry = 0, type;
1273 enum mmc_blk_status status;
1274 struct mmc_queue_req *mq_rq;
1275 struct request *req = rqc;
1276 struct mmc_async_req *areq;
1277
1278 if (!rqc && !mq->mqrq_prev->req)
1279 return 0;
1280
1281 do {
1282 if (rqc) {
1283 /*
1284 * When 4KB native sector is enabled, only 8 blocks
1285 * multiple read or write is allowed
1286 */
1287 if ((brq->data.blocks & 0x07) &&
1288 (card->ext_csd.data_sector_size == 4096)) {
1289 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1290 req->rq_disk->disk_name);
1291 goto cmd_abort;
1292 }
1293 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1294 areq = &mq->mqrq_cur->mmc_active;
1295 } else
1296 areq = NULL;
1297 areq = mmc_start_req(card->host, areq, (int *) &status);
1298 if (!areq)
1299 return 0;
1300
1301 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1302 brq = &mq_rq->brq;
1303 req = mq_rq->req;
1304 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1305 mmc_queue_bounce_post(mq_rq);
1306
1307 switch (status) {
1308 case MMC_BLK_SUCCESS:
1309 case MMC_BLK_PARTIAL:
1310 /*
1311 * A block was successfully transferred.
1312 */
1313 mmc_blk_reset_success(md, type);
1314 spin_lock_irq(&md->lock);
1315 ret = __blk_end_request(req, 0,
1316 brq->data.bytes_xfered);
1317 spin_unlock_irq(&md->lock);
1318 /*
1319 * If the blk_end_request function returns non-zero even
1320 * though all data has been transferred and no errors
1321 * were returned by the host controller, it's a bug.
1322 */
1323 if (status == MMC_BLK_SUCCESS && ret) {
1324 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1325 __func__, blk_rq_bytes(req),
1326 brq->data.bytes_xfered);
1327 rqc = NULL;
1328 goto cmd_abort;
1329 }
1330 break;
1331 case MMC_BLK_CMD_ERR:
1332 ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1333 if (!mmc_blk_reset(md, card->host, type))
1334 break;
1335 goto cmd_abort;
1336 case MMC_BLK_RETRY:
1337 if (retry++ < 5)
1338 break;
1339 /* Fall through */
1340 case MMC_BLK_ABORT:
1341 if (!mmc_blk_reset(md, card->host, type))
1342 break;
1343 goto cmd_abort;
1344 case MMC_BLK_DATA_ERR: {
1345 int err;
1346
1347 err = mmc_blk_reset(md, card->host, type);
1348 if (!err)
1349 break;
1350 if (err == -ENODEV)
1351 goto cmd_abort;
1352 /* Fall through */
1353 }
1354 case MMC_BLK_ECC_ERR:
1355 if (brq->data.blocks > 1) {
1356 /* Redo read one sector at a time */
1357 pr_warning("%s: retrying using single block read\n",
1358 req->rq_disk->disk_name);
1359 disable_multi = 1;
1360 break;
1361 }
1362 /*
1363 * After an error, we redo I/O one sector at a
1364 * time, so we only reach here after trying to
1365 * read a single sector.
1366 */
1367 spin_lock_irq(&md->lock);
1368 ret = __blk_end_request(req, -EIO,
1369 brq->data.blksz);
1370 spin_unlock_irq(&md->lock);
1371 if (!ret)
1372 goto start_new_req;
1373 break;
1374 case MMC_BLK_NOMEDIUM:
1375 goto cmd_abort;
1376 }
1377
1378 if (ret) {
1379 /*
1380 * In case of a incomplete request
1381 * prepare it again and resend.
1382 */
1383 mmc_blk_rw_rq_prep(mq_rq, card, disable_multi, mq);
1384 mmc_start_req(card->host, &mq_rq->mmc_active, NULL);
1385 }
1386 } while (ret);
1387
1388 return 1;
1389
1390 cmd_abort:
1391 spin_lock_irq(&md->lock);
1392 if (mmc_card_removed(card))
1393 req->cmd_flags |= REQ_QUIET;
1394 while (ret)
1395 ret = __blk_end_request(req, -EIO, blk_rq_cur_bytes(req));
1396 spin_unlock_irq(&md->lock);
1397
1398 start_new_req:
1399 if (rqc) {
1400 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1401 mmc_start_req(card->host, &mq->mqrq_cur->mmc_active, NULL);
1402 }
1403
1404 return 0;
1405 }
1406
1407 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1408 {
1409 int ret;
1410 struct mmc_blk_data *md = mq->data;
1411 struct mmc_card *card = md->queue.card;
1412
1413 if (req && !mq->mqrq_prev->req)
1414 /* claim host only for the first request */
1415 mmc_claim_host(card->host);
1416
1417 ret = mmc_blk_part_switch(card, md);
1418 if (ret) {
1419 if (req) {
1420 spin_lock_irq(&md->lock);
1421 __blk_end_request_all(req, -EIO);
1422 spin_unlock_irq(&md->lock);
1423 }
1424 ret = 0;
1425 goto out;
1426 }
1427
1428 if (req && req->cmd_flags & REQ_DISCARD) {
1429 /* complete ongoing async transfer before issuing discard */
1430 if (card->host->areq)
1431 mmc_blk_issue_rw_rq(mq, NULL);
1432 if (req->cmd_flags & REQ_SECURE)
1433 ret = mmc_blk_issue_secdiscard_rq(mq, req);
1434 else
1435 ret = mmc_blk_issue_discard_rq(mq, req);
1436 } else if (req && req->cmd_flags & REQ_FLUSH) {
1437 /* complete ongoing async transfer before issuing flush */
1438 if (card->host->areq)
1439 mmc_blk_issue_rw_rq(mq, NULL);
1440 ret = mmc_blk_issue_flush(mq, req);
1441 } else {
1442 ret = mmc_blk_issue_rw_rq(mq, req);
1443 }
1444
1445 out:
1446 if (!req)
1447 /* release host only when there are no more requests */
1448 mmc_release_host(card->host);
1449 return ret;
1450 }
1451
1452 static inline int mmc_blk_readonly(struct mmc_card *card)
1453 {
1454 return mmc_card_readonly(card) ||
1455 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
1456 }
1457
1458 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
1459 struct device *parent,
1460 sector_t size,
1461 bool default_ro,
1462 const char *subname,
1463 int area_type)
1464 {
1465 struct mmc_blk_data *md;
1466 int devidx, ret;
1467
1468 devidx = find_first_zero_bit(dev_use, max_devices);
1469 if (devidx >= max_devices)
1470 return ERR_PTR(-ENOSPC);
1471 __set_bit(devidx, dev_use);
1472
1473 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
1474 if (!md) {
1475 ret = -ENOMEM;
1476 goto out;
1477 }
1478
1479 /*
1480 * !subname implies we are creating main mmc_blk_data that will be
1481 * associated with mmc_card with mmc_set_drvdata. Due to device
1482 * partitions, devidx will not coincide with a per-physical card
1483 * index anymore so we keep track of a name index.
1484 */
1485 if (!subname) {
1486 md->name_idx = find_first_zero_bit(name_use, max_devices);
1487 __set_bit(md->name_idx, name_use);
1488 } else
1489 md->name_idx = ((struct mmc_blk_data *)
1490 dev_to_disk(parent)->private_data)->name_idx;
1491
1492 md->area_type = area_type;
1493
1494 /*
1495 * Set the read-only status based on the supported commands
1496 * and the write protect switch.
1497 */
1498 md->read_only = mmc_blk_readonly(card);
1499
1500 md->disk = alloc_disk(perdev_minors);
1501 if (md->disk == NULL) {
1502 ret = -ENOMEM;
1503 goto err_kfree;
1504 }
1505
1506 spin_lock_init(&md->lock);
1507 INIT_LIST_HEAD(&md->part);
1508 md->usage = 1;
1509
1510 ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
1511 if (ret)
1512 goto err_putdisk;
1513
1514 md->queue.issue_fn = mmc_blk_issue_rq;
1515 md->queue.data = md;
1516
1517 md->disk->major = MMC_BLOCK_MAJOR;
1518 md->disk->first_minor = devidx * perdev_minors;
1519 md->disk->fops = &mmc_bdops;
1520 md->disk->private_data = md;
1521 md->disk->queue = md->queue.queue;
1522 md->disk->driverfs_dev = parent;
1523 set_disk_ro(md->disk, md->read_only || default_ro);
1524
1525 /*
1526 * As discussed on lkml, GENHD_FL_REMOVABLE should:
1527 *
1528 * - be set for removable media with permanent block devices
1529 * - be unset for removable block devices with permanent media
1530 *
1531 * Since MMC block devices clearly fall under the second
1532 * case, we do not set GENHD_FL_REMOVABLE. Userspace
1533 * should use the block device creation/destruction hotplug
1534 * messages to tell when the card is present.
1535 */
1536
1537 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
1538 "mmcblk%d%s", md->name_idx, subname ? subname : "");
1539
1540 if (mmc_card_mmc(card))
1541 blk_queue_logical_block_size(md->queue.queue,
1542 card->ext_csd.data_sector_size);
1543 else
1544 blk_queue_logical_block_size(md->queue.queue, 512);
1545
1546 set_capacity(md->disk, size);
1547
1548 if (mmc_host_cmd23(card->host)) {
1549 if (mmc_card_mmc(card) ||
1550 (mmc_card_sd(card) &&
1551 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
1552 md->flags |= MMC_BLK_CMD23;
1553 }
1554
1555 if (mmc_card_mmc(card) &&
1556 md->flags & MMC_BLK_CMD23 &&
1557 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
1558 card->ext_csd.rel_sectors)) {
1559 md->flags |= MMC_BLK_REL_WR;
1560 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
1561 }
1562
1563 return md;
1564
1565 err_putdisk:
1566 put_disk(md->disk);
1567 err_kfree:
1568 kfree(md);
1569 out:
1570 return ERR_PTR(ret);
1571 }
1572
1573 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
1574 {
1575 sector_t size;
1576 struct mmc_blk_data *md;
1577
1578 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
1579 /*
1580 * The EXT_CSD sector count is in number or 512 byte
1581 * sectors.
1582 */
1583 size = card->ext_csd.sectors;
1584 } else {
1585 /*
1586 * The CSD capacity field is in units of read_blkbits.
1587 * set_capacity takes units of 512 bytes.
1588 */
1589 size = card->csd.capacity << (card->csd.read_blkbits - 9);
1590 }
1591
1592 md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
1593 MMC_BLK_DATA_AREA_MAIN);
1594 return md;
1595 }
1596
1597 static int mmc_blk_alloc_part(struct mmc_card *card,
1598 struct mmc_blk_data *md,
1599 unsigned int part_type,
1600 sector_t size,
1601 bool default_ro,
1602 const char *subname,
1603 int area_type)
1604 {
1605 char cap_str[10];
1606 struct mmc_blk_data *part_md;
1607
1608 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
1609 subname, area_type);
1610 if (IS_ERR(part_md))
1611 return PTR_ERR(part_md);
1612 part_md->part_type = part_type;
1613 list_add(&part_md->part, &md->part);
1614
1615 string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
1616 cap_str, sizeof(cap_str));
1617 pr_info("%s: %s %s partition %u %s\n",
1618 part_md->disk->disk_name, mmc_card_id(card),
1619 mmc_card_name(card), part_md->part_type, cap_str);
1620 return 0;
1621 }
1622
1623 /* MMC Physical partitions consist of two boot partitions and
1624 * up to four general purpose partitions.
1625 * For each partition enabled in EXT_CSD a block device will be allocatedi
1626 * to provide access to the partition.
1627 */
1628
1629 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
1630 {
1631 int idx, ret = 0;
1632
1633 if (!mmc_card_mmc(card))
1634 return 0;
1635
1636 for (idx = 0; idx < card->nr_parts; idx++) {
1637 if (card->part[idx].size) {
1638 ret = mmc_blk_alloc_part(card, md,
1639 card->part[idx].part_cfg,
1640 card->part[idx].size >> 9,
1641 card->part[idx].force_ro,
1642 card->part[idx].name,
1643 card->part[idx].area_type);
1644 if (ret)
1645 return ret;
1646 }
1647 }
1648
1649 return ret;
1650 }
1651
1652 static void mmc_blk_remove_req(struct mmc_blk_data *md)
1653 {
1654 struct mmc_card *card;
1655
1656 if (md) {
1657 card = md->queue.card;
1658 if (md->disk->flags & GENHD_FL_UP) {
1659 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
1660 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
1661 card->ext_csd.boot_ro_lockable)
1662 device_remove_file(disk_to_dev(md->disk),
1663 &md->power_ro_lock);
1664
1665 /* Stop new requests from getting into the queue */
1666 del_gendisk(md->disk);
1667 }
1668
1669 /* Then flush out any already in there */
1670 mmc_cleanup_queue(&md->queue);
1671 mmc_blk_put(md);
1672 }
1673 }
1674
1675 static void mmc_blk_remove_parts(struct mmc_card *card,
1676 struct mmc_blk_data *md)
1677 {
1678 struct list_head *pos, *q;
1679 struct mmc_blk_data *part_md;
1680
1681 __clear_bit(md->name_idx, name_use);
1682 list_for_each_safe(pos, q, &md->part) {
1683 part_md = list_entry(pos, struct mmc_blk_data, part);
1684 list_del(pos);
1685 mmc_blk_remove_req(part_md);
1686 }
1687 }
1688
1689 static int mmc_add_disk(struct mmc_blk_data *md)
1690 {
1691 int ret;
1692 struct mmc_card *card = md->queue.card;
1693
1694 add_disk(md->disk);
1695 md->force_ro.show = force_ro_show;
1696 md->force_ro.store = force_ro_store;
1697 sysfs_attr_init(&md->force_ro.attr);
1698 md->force_ro.attr.name = "force_ro";
1699 md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
1700 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
1701 if (ret)
1702 goto force_ro_fail;
1703
1704 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
1705 card->ext_csd.boot_ro_lockable) {
1706 umode_t mode;
1707
1708 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
1709 mode = S_IRUGO;
1710 else
1711 mode = S_IRUGO | S_IWUSR;
1712
1713 md->power_ro_lock.show = power_ro_lock_show;
1714 md->power_ro_lock.store = power_ro_lock_store;
1715 sysfs_attr_init(&md->power_ro_lock.attr);
1716 md->power_ro_lock.attr.mode = mode;
1717 md->power_ro_lock.attr.name =
1718 "ro_lock_until_next_power_on";
1719 ret = device_create_file(disk_to_dev(md->disk),
1720 &md->power_ro_lock);
1721 if (ret)
1722 goto power_ro_lock_fail;
1723 }
1724 return ret;
1725
1726 power_ro_lock_fail:
1727 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
1728 force_ro_fail:
1729 del_gendisk(md->disk);
1730
1731 return ret;
1732 }
1733
1734 #define CID_MANFID_SANDISK 0x2
1735 #define CID_MANFID_TOSHIBA 0x11
1736 #define CID_MANFID_MICRON 0x13
1737
1738 static const struct mmc_fixup blk_fixups[] =
1739 {
1740 MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
1741 MMC_QUIRK_INAND_CMD38),
1742 MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
1743 MMC_QUIRK_INAND_CMD38),
1744 MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
1745 MMC_QUIRK_INAND_CMD38),
1746 MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
1747 MMC_QUIRK_INAND_CMD38),
1748 MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
1749 MMC_QUIRK_INAND_CMD38),
1750
1751 /*
1752 * Some MMC cards experience performance degradation with CMD23
1753 * instead of CMD12-bounded multiblock transfers. For now we'll
1754 * black list what's bad...
1755 * - Certain Toshiba cards.
1756 *
1757 * N.B. This doesn't affect SD cards.
1758 */
1759 MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
1760 MMC_QUIRK_BLK_NO_CMD23),
1761 MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
1762 MMC_QUIRK_BLK_NO_CMD23),
1763 MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
1764 MMC_QUIRK_BLK_NO_CMD23),
1765
1766 /*
1767 * Some Micron MMC cards needs longer data read timeout than
1768 * indicated in CSD.
1769 */
1770 MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
1771 MMC_QUIRK_LONG_READ_TIME),
1772
1773 END_FIXUP
1774 };
1775
1776 static int mmc_blk_probe(struct mmc_card *card)
1777 {
1778 struct mmc_blk_data *md, *part_md;
1779 char cap_str[10];
1780
1781 /*
1782 * Check that the card supports the command class(es) we need.
1783 */
1784 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
1785 return -ENODEV;
1786
1787 md = mmc_blk_alloc(card);
1788 if (IS_ERR(md))
1789 return PTR_ERR(md);
1790
1791 string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
1792 cap_str, sizeof(cap_str));
1793 pr_info("%s: %s %s %s %s\n",
1794 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
1795 cap_str, md->read_only ? "(ro)" : "");
1796
1797 if (mmc_blk_alloc_parts(card, md))
1798 goto out;
1799
1800 mmc_set_drvdata(card, md);
1801 mmc_fixup_device(card, blk_fixups);
1802
1803 if (mmc_add_disk(md))
1804 goto out;
1805
1806 list_for_each_entry(part_md, &md->part, part) {
1807 if (mmc_add_disk(part_md))
1808 goto out;
1809 }
1810 return 0;
1811
1812 out:
1813 mmc_blk_remove_parts(card, md);
1814 mmc_blk_remove_req(md);
1815 return 0;
1816 }
1817
1818 static void mmc_blk_remove(struct mmc_card *card)
1819 {
1820 struct mmc_blk_data *md = mmc_get_drvdata(card);
1821
1822 mmc_blk_remove_parts(card, md);
1823 mmc_claim_host(card->host);
1824 mmc_blk_part_switch(card, md);
1825 mmc_release_host(card->host);
1826 mmc_blk_remove_req(md);
1827 mmc_set_drvdata(card, NULL);
1828 }
1829
1830 #ifdef CONFIG_PM
1831 static int mmc_blk_suspend(struct mmc_card *card)
1832 {
1833 struct mmc_blk_data *part_md;
1834 struct mmc_blk_data *md = mmc_get_drvdata(card);
1835
1836 if (md) {
1837 mmc_queue_suspend(&md->queue);
1838 list_for_each_entry(part_md, &md->part, part) {
1839 mmc_queue_suspend(&part_md->queue);
1840 }
1841 }
1842 return 0;
1843 }
1844
1845 static int mmc_blk_resume(struct mmc_card *card)
1846 {
1847 struct mmc_blk_data *part_md;
1848 struct mmc_blk_data *md = mmc_get_drvdata(card);
1849
1850 if (md) {
1851 /*
1852 * Resume involves the card going into idle state,
1853 * so current partition is always the main one.
1854 */
1855 md->part_curr = md->part_type;
1856 mmc_queue_resume(&md->queue);
1857 list_for_each_entry(part_md, &md->part, part) {
1858 mmc_queue_resume(&part_md->queue);
1859 }
1860 }
1861 return 0;
1862 }
1863 #else
1864 #define mmc_blk_suspend NULL
1865 #define mmc_blk_resume NULL
1866 #endif
1867
1868 static struct mmc_driver mmc_driver = {
1869 .drv = {
1870 .name = "mmcblk",
1871 },
1872 .probe = mmc_blk_probe,
1873 .remove = mmc_blk_remove,
1874 .suspend = mmc_blk_suspend,
1875 .resume = mmc_blk_resume,
1876 };
1877
1878 static int __init mmc_blk_init(void)
1879 {
1880 int res;
1881
1882 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
1883 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
1884
1885 max_devices = 256 / perdev_minors;
1886
1887 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
1888 if (res)
1889 goto out;
1890
1891 res = mmc_register_driver(&mmc_driver);
1892 if (res)
1893 goto out2;
1894
1895 return 0;
1896 out2:
1897 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1898 out:
1899 return res;
1900 }
1901
1902 static void __exit mmc_blk_exit(void)
1903 {
1904 mmc_unregister_driver(&mmc_driver);
1905 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
1906 }
1907
1908 module_init(mmc_blk_init);
1909 module_exit(mmc_blk_exit);
1910
1911 MODULE_LICENSE("GPL");
1912 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
1913
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