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mmc: fix host release issue after discard operation
[GitHub/mt8127/android_kernel_alcatel_ttab.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 #define MMC_BLK_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
61
62 #define mmc_req_rel_wr(req) (((req->cmd_flags & REQ_FUA) || \
63 (req->cmd_flags & REQ_META)) && \
64 (rq_data_dir(req) == WRITE))
65 #define PACKED_CMD_VER 0x01
66 #define PACKED_CMD_WR 0x02
67
68 static DEFINE_MUTEX(block_mutex);
69
70 /*
71 * The defaults come from config options but can be overriden by module
72 * or bootarg options.
73 */
74 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
75
76 /*
77 * We've only got one major, so number of mmcblk devices is
78 * limited to 256 / number of minors per device.
79 */
80 static int max_devices;
81
82 /* 256 minors, so at most 256 separate devices */
83 static DECLARE_BITMAP(dev_use, 256);
84 static DECLARE_BITMAP(name_use, 256);
85
86 /*
87 * There is one mmc_blk_data per slot.
88 */
89 struct mmc_blk_data {
90 spinlock_t lock;
91 struct gendisk *disk;
92 struct mmc_queue queue;
93 struct list_head part;
94
95 unsigned int flags;
96 #define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
97 #define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */
98 #define MMC_BLK_PACKED_CMD (1 << 2) /* MMC packed command support */
99
100 unsigned int usage;
101 unsigned int read_only;
102 unsigned int part_type;
103 unsigned int name_idx;
104 unsigned int reset_done;
105 #define MMC_BLK_READ BIT(0)
106 #define MMC_BLK_WRITE BIT(1)
107 #define MMC_BLK_DISCARD BIT(2)
108 #define MMC_BLK_SECDISCARD BIT(3)
109
110 /*
111 * Only set in main mmc_blk_data associated
112 * with mmc_card with mmc_set_drvdata, and keeps
113 * track of the current selected device partition.
114 */
115 unsigned int part_curr;
116 struct device_attribute force_ro;
117 struct device_attribute power_ro_lock;
118 int area_type;
119 };
120
121 static DEFINE_MUTEX(open_lock);
122
123 enum {
124 MMC_PACKED_NR_IDX = -1,
125 MMC_PACKED_NR_ZERO,
126 MMC_PACKED_NR_SINGLE,
127 };
128
129 module_param(perdev_minors, int, 0444);
130 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
131
132 static inline int mmc_blk_part_switch(struct mmc_card *card,
133 struct mmc_blk_data *md);
134 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
135
136 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
137 {
138 struct mmc_packed *packed = mqrq->packed;
139
140 BUG_ON(!packed);
141
142 mqrq->cmd_type = MMC_PACKED_NONE;
143 packed->nr_entries = MMC_PACKED_NR_ZERO;
144 packed->idx_failure = MMC_PACKED_NR_IDX;
145 packed->retries = 0;
146 packed->blocks = 0;
147 }
148
149 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
150 {
151 struct mmc_blk_data *md;
152
153 mutex_lock(&open_lock);
154 md = disk->private_data;
155 if (md && md->usage == 0)
156 md = NULL;
157 if (md)
158 md->usage++;
159 mutex_unlock(&open_lock);
160
161 return md;
162 }
163
164 static inline int mmc_get_devidx(struct gendisk *disk)
165 {
166 int devmaj = MAJOR(disk_devt(disk));
167 int devidx = MINOR(disk_devt(disk)) / perdev_minors;
168
169 if (!devmaj)
170 devidx = disk->first_minor / perdev_minors;
171 return devidx;
172 }
173
174 static void mmc_blk_put(struct mmc_blk_data *md)
175 {
176 mutex_lock(&open_lock);
177 md->usage--;
178 if (md->usage == 0) {
179 int devidx = mmc_get_devidx(md->disk);
180 blk_cleanup_queue(md->queue.queue);
181
182 __clear_bit(devidx, dev_use);
183
184 put_disk(md->disk);
185 kfree(md);
186 }
187 mutex_unlock(&open_lock);
188 }
189
190 static ssize_t power_ro_lock_show(struct device *dev,
191 struct device_attribute *attr, char *buf)
192 {
193 int ret;
194 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
195 struct mmc_card *card = md->queue.card;
196 int locked = 0;
197
198 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
199 locked = 2;
200 else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
201 locked = 1;
202
203 ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
204
205 return ret;
206 }
207
208 static ssize_t power_ro_lock_store(struct device *dev,
209 struct device_attribute *attr, const char *buf, size_t count)
210 {
211 int ret;
212 struct mmc_blk_data *md, *part_md;
213 struct mmc_card *card;
214 unsigned long set;
215
216 if (kstrtoul(buf, 0, &set))
217 return -EINVAL;
218
219 if (set != 1)
220 return count;
221
222 md = mmc_blk_get(dev_to_disk(dev));
223 card = md->queue.card;
224
225 mmc_claim_host(card->host);
226
227 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
228 card->ext_csd.boot_ro_lock |
229 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
230 card->ext_csd.part_time);
231 if (ret)
232 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
233 else
234 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
235
236 mmc_release_host(card->host);
237
238 if (!ret) {
239 pr_info("%s: Locking boot partition ro until next power on\n",
240 md->disk->disk_name);
241 set_disk_ro(md->disk, 1);
242
243 list_for_each_entry(part_md, &md->part, part)
244 if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
245 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
246 set_disk_ro(part_md->disk, 1);
247 }
248 }
249
250 mmc_blk_put(md);
251 return count;
252 }
253
254 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
255 char *buf)
256 {
257 int ret;
258 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
259
260 ret = snprintf(buf, PAGE_SIZE, "%d",
261 get_disk_ro(dev_to_disk(dev)) ^
262 md->read_only);
263 mmc_blk_put(md);
264 return ret;
265 }
266
267 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
268 const char *buf, size_t count)
269 {
270 int ret;
271 char *end;
272 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
273 unsigned long set = simple_strtoul(buf, &end, 0);
274 if (end == buf) {
275 ret = -EINVAL;
276 goto out;
277 }
278
279 set_disk_ro(dev_to_disk(dev), set || md->read_only);
280 ret = count;
281 out:
282 mmc_blk_put(md);
283 return ret;
284 }
285
286 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
287 {
288 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
289 int ret = -ENXIO;
290
291 mutex_lock(&block_mutex);
292 if (md) {
293 if (md->usage == 2)
294 check_disk_change(bdev);
295 ret = 0;
296
297 if ((mode & FMODE_WRITE) && md->read_only) {
298 mmc_blk_put(md);
299 ret = -EROFS;
300 }
301 }
302 mutex_unlock(&block_mutex);
303
304 return ret;
305 }
306
307 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
308 {
309 struct mmc_blk_data *md = disk->private_data;
310
311 mutex_lock(&block_mutex);
312 mmc_blk_put(md);
313 mutex_unlock(&block_mutex);
314 }
315
316 static int
317 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
318 {
319 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
320 geo->heads = 4;
321 geo->sectors = 16;
322 return 0;
323 }
324
325 struct mmc_blk_ioc_data {
326 struct mmc_ioc_cmd ic;
327 unsigned char *buf;
328 u64 buf_bytes;
329 };
330
331 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
332 struct mmc_ioc_cmd __user *user)
333 {
334 struct mmc_blk_ioc_data *idata;
335 int err;
336
337 idata = kzalloc(sizeof(*idata), GFP_KERNEL);
338 if (!idata) {
339 err = -ENOMEM;
340 goto out;
341 }
342
343 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
344 err = -EFAULT;
345 goto idata_err;
346 }
347
348 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
349 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
350 err = -EOVERFLOW;
351 goto idata_err;
352 }
353
354 if (!idata->buf_bytes)
355 return idata;
356
357 idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
358 if (!idata->buf) {
359 err = -ENOMEM;
360 goto idata_err;
361 }
362
363 if (copy_from_user(idata->buf, (void __user *)(unsigned long)
364 idata->ic.data_ptr, idata->buf_bytes)) {
365 err = -EFAULT;
366 goto copy_err;
367 }
368
369 return idata;
370
371 copy_err:
372 kfree(idata->buf);
373 idata_err:
374 kfree(idata);
375 out:
376 return ERR_PTR(err);
377 }
378
379 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
380 u32 retries_max)
381 {
382 int err;
383 u32 retry_count = 0;
384
385 if (!status || !retries_max)
386 return -EINVAL;
387
388 do {
389 err = get_card_status(card, status, 5);
390 if (err)
391 break;
392
393 if (!R1_STATUS(*status) &&
394 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
395 break; /* RPMB programming operation complete */
396
397 /*
398 * Rechedule to give the MMC device a chance to continue
399 * processing the previous command without being polled too
400 * frequently.
401 */
402 usleep_range(1000, 5000);
403 } while (++retry_count < retries_max);
404
405 if (retry_count == retries_max)
406 err = -EPERM;
407
408 return err;
409 }
410
411 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
412 struct mmc_ioc_cmd __user *ic_ptr)
413 {
414 struct mmc_blk_ioc_data *idata;
415 struct mmc_blk_data *md;
416 struct mmc_card *card;
417 struct mmc_command cmd = {0};
418 struct mmc_data data = {0};
419 struct mmc_request mrq = {NULL};
420 struct scatterlist sg;
421 int err;
422 int is_rpmb = false;
423 u32 status = 0;
424
425 /*
426 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
427 * whole block device, not on a partition. This prevents overspray
428 * between sibling partitions.
429 */
430 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
431 return -EPERM;
432
433 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
434 if (IS_ERR(idata))
435 return PTR_ERR(idata);
436
437 md = mmc_blk_get(bdev->bd_disk);
438 if (!md) {
439 err = -EINVAL;
440 goto cmd_err;
441 }
442
443 if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
444 is_rpmb = true;
445
446 card = md->queue.card;
447 if (IS_ERR(card)) {
448 err = PTR_ERR(card);
449 goto cmd_done;
450 }
451
452 cmd.opcode = idata->ic.opcode;
453 cmd.arg = idata->ic.arg;
454 cmd.flags = idata->ic.flags;
455
456 if (idata->buf_bytes) {
457 data.sg = &sg;
458 data.sg_len = 1;
459 data.blksz = idata->ic.blksz;
460 data.blocks = idata->ic.blocks;
461
462 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
463
464 if (idata->ic.write_flag)
465 data.flags = MMC_DATA_WRITE;
466 else
467 data.flags = MMC_DATA_READ;
468
469 /* data.flags must already be set before doing this. */
470 mmc_set_data_timeout(&data, card);
471
472 /* Allow overriding the timeout_ns for empirical tuning. */
473 if (idata->ic.data_timeout_ns)
474 data.timeout_ns = idata->ic.data_timeout_ns;
475
476 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
477 /*
478 * Pretend this is a data transfer and rely on the
479 * host driver to compute timeout. When all host
480 * drivers support cmd.cmd_timeout for R1B, this
481 * can be changed to:
482 *
483 * mrq.data = NULL;
484 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
485 */
486 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
487 }
488
489 mrq.data = &data;
490 }
491
492 mrq.cmd = &cmd;
493
494 mmc_claim_host(card->host);
495
496 err = mmc_blk_part_switch(card, md);
497 if (err)
498 goto cmd_rel_host;
499
500 if (idata->ic.is_acmd) {
501 err = mmc_app_cmd(card->host, card);
502 if (err)
503 goto cmd_rel_host;
504 }
505
506 if (is_rpmb) {
507 err = mmc_set_blockcount(card, data.blocks,
508 idata->ic.write_flag & (1 << 31));
509 if (err)
510 goto cmd_rel_host;
511 }
512
513 mmc_wait_for_req(card->host, &mrq);
514
515 if (cmd.error) {
516 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
517 __func__, cmd.error);
518 err = cmd.error;
519 goto cmd_rel_host;
520 }
521 if (data.error) {
522 dev_err(mmc_dev(card->host), "%s: data error %d\n",
523 __func__, data.error);
524 err = data.error;
525 goto cmd_rel_host;
526 }
527
528 /*
529 * According to the SD specs, some commands require a delay after
530 * issuing the command.
531 */
532 if (idata->ic.postsleep_min_us)
533 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
534
535 if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
536 err = -EFAULT;
537 goto cmd_rel_host;
538 }
539
540 if (!idata->ic.write_flag) {
541 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
542 idata->buf, idata->buf_bytes)) {
543 err = -EFAULT;
544 goto cmd_rel_host;
545 }
546 }
547
548 if (is_rpmb) {
549 /*
550 * Ensure RPMB command has completed by polling CMD13
551 * "Send Status".
552 */
553 err = ioctl_rpmb_card_status_poll(card, &status, 5);
554 if (err)
555 dev_err(mmc_dev(card->host),
556 "%s: Card Status=0x%08X, error %d\n",
557 __func__, status, err);
558 }
559
560 cmd_rel_host:
561 mmc_release_host(card->host);
562
563 cmd_done:
564 mmc_blk_put(md);
565 cmd_err:
566 kfree(idata->buf);
567 kfree(idata);
568 return err;
569 }
570
571 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
572 unsigned int cmd, unsigned long arg)
573 {
574 int ret = -EINVAL;
575 if (cmd == MMC_IOC_CMD)
576 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
577 return ret;
578 }
579
580 #ifdef CONFIG_COMPAT
581 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
582 unsigned int cmd, unsigned long arg)
583 {
584 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
585 }
586 #endif
587
588 static const struct block_device_operations mmc_bdops = {
589 .open = mmc_blk_open,
590 .release = mmc_blk_release,
591 .getgeo = mmc_blk_getgeo,
592 .owner = THIS_MODULE,
593 .ioctl = mmc_blk_ioctl,
594 #ifdef CONFIG_COMPAT
595 .compat_ioctl = mmc_blk_compat_ioctl,
596 #endif
597 };
598
599 static inline int mmc_blk_part_switch(struct mmc_card *card,
600 struct mmc_blk_data *md)
601 {
602 int ret;
603 struct mmc_blk_data *main_md = mmc_get_drvdata(card);
604
605 if (main_md->part_curr == md->part_type)
606 return 0;
607
608 if (mmc_card_mmc(card)) {
609 u8 part_config = card->ext_csd.part_config;
610
611 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
612 part_config |= md->part_type;
613
614 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
615 EXT_CSD_PART_CONFIG, part_config,
616 card->ext_csd.part_time);
617 if (ret)
618 return ret;
619
620 card->ext_csd.part_config = part_config;
621 }
622
623 main_md->part_curr = md->part_type;
624 return 0;
625 }
626
627 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
628 {
629 int err;
630 u32 result;
631 __be32 *blocks;
632
633 struct mmc_request mrq = {NULL};
634 struct mmc_command cmd = {0};
635 struct mmc_data data = {0};
636
637 struct scatterlist sg;
638
639 cmd.opcode = MMC_APP_CMD;
640 cmd.arg = card->rca << 16;
641 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
642
643 err = mmc_wait_for_cmd(card->host, &cmd, 0);
644 if (err)
645 return (u32)-1;
646 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
647 return (u32)-1;
648
649 memset(&cmd, 0, sizeof(struct mmc_command));
650
651 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
652 cmd.arg = 0;
653 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
654
655 data.blksz = 4;
656 data.blocks = 1;
657 data.flags = MMC_DATA_READ;
658 data.sg = &sg;
659 data.sg_len = 1;
660 mmc_set_data_timeout(&data, card);
661
662 mrq.cmd = &cmd;
663 mrq.data = &data;
664
665 blocks = kmalloc(4, GFP_KERNEL);
666 if (!blocks)
667 return (u32)-1;
668
669 sg_init_one(&sg, blocks, 4);
670
671 mmc_wait_for_req(card->host, &mrq);
672
673 result = ntohl(*blocks);
674 kfree(blocks);
675
676 if (cmd.error || data.error)
677 result = (u32)-1;
678
679 return result;
680 }
681
682 static int send_stop(struct mmc_card *card, u32 *status)
683 {
684 struct mmc_command cmd = {0};
685 int err;
686
687 cmd.opcode = MMC_STOP_TRANSMISSION;
688 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
689 err = mmc_wait_for_cmd(card->host, &cmd, 5);
690 if (err == 0)
691 *status = cmd.resp[0];
692 return err;
693 }
694
695 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
696 {
697 struct mmc_command cmd = {0};
698 int err;
699
700 cmd.opcode = MMC_SEND_STATUS;
701 if (!mmc_host_is_spi(card->host))
702 cmd.arg = card->rca << 16;
703 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
704 err = mmc_wait_for_cmd(card->host, &cmd, retries);
705 if (err == 0)
706 *status = cmd.resp[0];
707 return err;
708 }
709
710 #define ERR_NOMEDIUM 3
711 #define ERR_RETRY 2
712 #define ERR_ABORT 1
713 #define ERR_CONTINUE 0
714
715 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
716 bool status_valid, u32 status)
717 {
718 switch (error) {
719 case -EILSEQ:
720 /* response crc error, retry the r/w cmd */
721 pr_err("%s: %s sending %s command, card status %#x\n",
722 req->rq_disk->disk_name, "response CRC error",
723 name, status);
724 return ERR_RETRY;
725
726 case -ETIMEDOUT:
727 pr_err("%s: %s sending %s command, card status %#x\n",
728 req->rq_disk->disk_name, "timed out", name, status);
729
730 /* If the status cmd initially failed, retry the r/w cmd */
731 if (!status_valid)
732 return ERR_RETRY;
733
734 /*
735 * If it was a r/w cmd crc error, or illegal command
736 * (eg, issued in wrong state) then retry - we should
737 * have corrected the state problem above.
738 */
739 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
740 return ERR_RETRY;
741
742 /* Otherwise abort the command */
743 return ERR_ABORT;
744
745 default:
746 /* We don't understand the error code the driver gave us */
747 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
748 req->rq_disk->disk_name, error, status);
749 return ERR_ABORT;
750 }
751 }
752
753 /*
754 * Initial r/w and stop cmd error recovery.
755 * We don't know whether the card received the r/w cmd or not, so try to
756 * restore things back to a sane state. Essentially, we do this as follows:
757 * - Obtain card status. If the first attempt to obtain card status fails,
758 * the status word will reflect the failed status cmd, not the failed
759 * r/w cmd. If we fail to obtain card status, it suggests we can no
760 * longer communicate with the card.
761 * - Check the card state. If the card received the cmd but there was a
762 * transient problem with the response, it might still be in a data transfer
763 * mode. Try to send it a stop command. If this fails, we can't recover.
764 * - If the r/w cmd failed due to a response CRC error, it was probably
765 * transient, so retry the cmd.
766 * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
767 * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
768 * illegal cmd, retry.
769 * Otherwise we don't understand what happened, so abort.
770 */
771 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
772 struct mmc_blk_request *brq, int *ecc_err, int *gen_err)
773 {
774 bool prev_cmd_status_valid = true;
775 u32 status, stop_status = 0;
776 int err, retry;
777
778 if (mmc_card_removed(card))
779 return ERR_NOMEDIUM;
780
781 /*
782 * Try to get card status which indicates both the card state
783 * and why there was no response. If the first attempt fails,
784 * we can't be sure the returned status is for the r/w command.
785 */
786 for (retry = 2; retry >= 0; retry--) {
787 err = get_card_status(card, &status, 0);
788 if (!err)
789 break;
790
791 prev_cmd_status_valid = false;
792 pr_err("%s: error %d sending status command, %sing\n",
793 req->rq_disk->disk_name, err, retry ? "retry" : "abort");
794 }
795
796 /* We couldn't get a response from the card. Give up. */
797 if (err) {
798 /* Check if the card is removed */
799 if (mmc_detect_card_removed(card->host))
800 return ERR_NOMEDIUM;
801 return ERR_ABORT;
802 }
803
804 /* Flag ECC errors */
805 if ((status & R1_CARD_ECC_FAILED) ||
806 (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
807 (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
808 *ecc_err = 1;
809
810 /* Flag General errors */
811 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
812 if ((status & R1_ERROR) ||
813 (brq->stop.resp[0] & R1_ERROR)) {
814 pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
815 req->rq_disk->disk_name, __func__,
816 brq->stop.resp[0], status);
817 *gen_err = 1;
818 }
819
820 /*
821 * Check the current card state. If it is in some data transfer
822 * mode, tell it to stop (and hopefully transition back to TRAN.)
823 */
824 if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
825 R1_CURRENT_STATE(status) == R1_STATE_RCV) {
826 err = send_stop(card, &stop_status);
827 if (err)
828 pr_err("%s: error %d sending stop command\n",
829 req->rq_disk->disk_name, err);
830
831 /*
832 * If the stop cmd also timed out, the card is probably
833 * not present, so abort. Other errors are bad news too.
834 */
835 if (err)
836 return ERR_ABORT;
837 if (stop_status & R1_CARD_ECC_FAILED)
838 *ecc_err = 1;
839 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
840 if (stop_status & R1_ERROR) {
841 pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
842 req->rq_disk->disk_name, __func__,
843 stop_status);
844 *gen_err = 1;
845 }
846 }
847
848 /* Check for set block count errors */
849 if (brq->sbc.error)
850 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
851 prev_cmd_status_valid, status);
852
853 /* Check for r/w command errors */
854 if (brq->cmd.error)
855 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
856 prev_cmd_status_valid, status);
857
858 /* Data errors */
859 if (!brq->stop.error)
860 return ERR_CONTINUE;
861
862 /* Now for stop errors. These aren't fatal to the transfer. */
863 pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
864 req->rq_disk->disk_name, brq->stop.error,
865 brq->cmd.resp[0], status);
866
867 /*
868 * Subsitute in our own stop status as this will give the error
869 * state which happened during the execution of the r/w command.
870 */
871 if (stop_status) {
872 brq->stop.resp[0] = stop_status;
873 brq->stop.error = 0;
874 }
875 return ERR_CONTINUE;
876 }
877
878 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
879 int type)
880 {
881 int err;
882
883 if (md->reset_done & type)
884 return -EEXIST;
885
886 md->reset_done |= type;
887 err = mmc_hw_reset(host);
888 /* Ensure we switch back to the correct partition */
889 if (err != -EOPNOTSUPP) {
890 struct mmc_blk_data *main_md = mmc_get_drvdata(host->card);
891 int part_err;
892
893 main_md->part_curr = main_md->part_type;
894 part_err = mmc_blk_part_switch(host->card, md);
895 if (part_err) {
896 /*
897 * We have failed to get back into the correct
898 * partition, so we need to abort the whole request.
899 */
900 return -ENODEV;
901 }
902 }
903 return err;
904 }
905
906 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
907 {
908 md->reset_done &= ~type;
909 }
910
911 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
912 {
913 struct mmc_blk_data *md = mq->data;
914 struct mmc_card *card = md->queue.card;
915 unsigned int from, nr, arg;
916 int err = 0, type = MMC_BLK_DISCARD;
917
918 if (!mmc_can_erase(card)) {
919 err = -EOPNOTSUPP;
920 goto out;
921 }
922
923 from = blk_rq_pos(req);
924 nr = blk_rq_sectors(req);
925
926 if (mmc_can_discard(card))
927 arg = MMC_DISCARD_ARG;
928 else if (mmc_can_trim(card))
929 arg = MMC_TRIM_ARG;
930 else
931 arg = MMC_ERASE_ARG;
932 retry:
933 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
934 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
935 INAND_CMD38_ARG_EXT_CSD,
936 arg == MMC_TRIM_ARG ?
937 INAND_CMD38_ARG_TRIM :
938 INAND_CMD38_ARG_ERASE,
939 0);
940 if (err)
941 goto out;
942 }
943 err = mmc_erase(card, from, nr, arg);
944 out:
945 if (err == -EIO && !mmc_blk_reset(md, card->host, type))
946 goto retry;
947 if (!err)
948 mmc_blk_reset_success(md, type);
949 blk_end_request(req, err, blk_rq_bytes(req));
950
951 return err ? 0 : 1;
952 }
953
954 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
955 struct request *req)
956 {
957 struct mmc_blk_data *md = mq->data;
958 struct mmc_card *card = md->queue.card;
959 unsigned int from, nr, arg, trim_arg, erase_arg;
960 int err = 0, type = MMC_BLK_SECDISCARD;
961
962 if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
963 err = -EOPNOTSUPP;
964 goto out;
965 }
966
967 from = blk_rq_pos(req);
968 nr = blk_rq_sectors(req);
969
970 /* The sanitize operation is supported at v4.5 only */
971 if (mmc_can_sanitize(card)) {
972 erase_arg = MMC_ERASE_ARG;
973 trim_arg = MMC_TRIM_ARG;
974 } else {
975 erase_arg = MMC_SECURE_ERASE_ARG;
976 trim_arg = MMC_SECURE_TRIM1_ARG;
977 }
978
979 if (mmc_erase_group_aligned(card, from, nr))
980 arg = erase_arg;
981 else if (mmc_can_trim(card))
982 arg = trim_arg;
983 else {
984 err = -EINVAL;
985 goto out;
986 }
987 retry:
988 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
989 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
990 INAND_CMD38_ARG_EXT_CSD,
991 arg == MMC_SECURE_TRIM1_ARG ?
992 INAND_CMD38_ARG_SECTRIM1 :
993 INAND_CMD38_ARG_SECERASE,
994 0);
995 if (err)
996 goto out_retry;
997 }
998
999 err = mmc_erase(card, from, nr, arg);
1000 if (err == -EIO)
1001 goto out_retry;
1002 if (err)
1003 goto out;
1004
1005 if (arg == MMC_SECURE_TRIM1_ARG) {
1006 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1007 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1008 INAND_CMD38_ARG_EXT_CSD,
1009 INAND_CMD38_ARG_SECTRIM2,
1010 0);
1011 if (err)
1012 goto out_retry;
1013 }
1014
1015 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1016 if (err == -EIO)
1017 goto out_retry;
1018 if (err)
1019 goto out;
1020 }
1021
1022 if (mmc_can_sanitize(card))
1023 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1024 EXT_CSD_SANITIZE_START, 1, 0);
1025 out_retry:
1026 if (err && !mmc_blk_reset(md, card->host, type))
1027 goto retry;
1028 if (!err)
1029 mmc_blk_reset_success(md, type);
1030 out:
1031 blk_end_request(req, err, blk_rq_bytes(req));
1032
1033 return err ? 0 : 1;
1034 }
1035
1036 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1037 {
1038 struct mmc_blk_data *md = mq->data;
1039 struct mmc_card *card = md->queue.card;
1040 int ret = 0;
1041
1042 ret = mmc_flush_cache(card);
1043 if (ret)
1044 ret = -EIO;
1045
1046 blk_end_request_all(req, ret);
1047
1048 return ret ? 0 : 1;
1049 }
1050
1051 /*
1052 * Reformat current write as a reliable write, supporting
1053 * both legacy and the enhanced reliable write MMC cards.
1054 * In each transfer we'll handle only as much as a single
1055 * reliable write can handle, thus finish the request in
1056 * partial completions.
1057 */
1058 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1059 struct mmc_card *card,
1060 struct request *req)
1061 {
1062 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1063 /* Legacy mode imposes restrictions on transfers. */
1064 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1065 brq->data.blocks = 1;
1066
1067 if (brq->data.blocks > card->ext_csd.rel_sectors)
1068 brq->data.blocks = card->ext_csd.rel_sectors;
1069 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1070 brq->data.blocks = 1;
1071 }
1072 }
1073
1074 #define CMD_ERRORS \
1075 (R1_OUT_OF_RANGE | /* Command argument out of range */ \
1076 R1_ADDRESS_ERROR | /* Misaligned address */ \
1077 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
1078 R1_WP_VIOLATION | /* Tried to write to protected block */ \
1079 R1_CC_ERROR | /* Card controller error */ \
1080 R1_ERROR) /* General/unknown error */
1081
1082 static int mmc_blk_err_check(struct mmc_card *card,
1083 struct mmc_async_req *areq)
1084 {
1085 struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1086 mmc_active);
1087 struct mmc_blk_request *brq = &mq_mrq->brq;
1088 struct request *req = mq_mrq->req;
1089 int ecc_err = 0, gen_err = 0;
1090
1091 /*
1092 * sbc.error indicates a problem with the set block count
1093 * command. No data will have been transferred.
1094 *
1095 * cmd.error indicates a problem with the r/w command. No
1096 * data will have been transferred.
1097 *
1098 * stop.error indicates a problem with the stop command. Data
1099 * may have been transferred, or may still be transferring.
1100 */
1101 if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1102 brq->data.error) {
1103 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1104 case ERR_RETRY:
1105 return MMC_BLK_RETRY;
1106 case ERR_ABORT:
1107 return MMC_BLK_ABORT;
1108 case ERR_NOMEDIUM:
1109 return MMC_BLK_NOMEDIUM;
1110 case ERR_CONTINUE:
1111 break;
1112 }
1113 }
1114
1115 /*
1116 * Check for errors relating to the execution of the
1117 * initial command - such as address errors. No data
1118 * has been transferred.
1119 */
1120 if (brq->cmd.resp[0] & CMD_ERRORS) {
1121 pr_err("%s: r/w command failed, status = %#x\n",
1122 req->rq_disk->disk_name, brq->cmd.resp[0]);
1123 return MMC_BLK_ABORT;
1124 }
1125
1126 /*
1127 * Everything else is either success, or a data error of some
1128 * kind. If it was a write, we may have transitioned to
1129 * program mode, which we have to wait for it to complete.
1130 */
1131 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1132 u32 status;
1133 unsigned long timeout;
1134
1135 /* Check stop command response */
1136 if (brq->stop.resp[0] & R1_ERROR) {
1137 pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1138 req->rq_disk->disk_name, __func__,
1139 brq->stop.resp[0]);
1140 gen_err = 1;
1141 }
1142
1143 timeout = jiffies + msecs_to_jiffies(MMC_BLK_TIMEOUT_MS);
1144 do {
1145 int err = get_card_status(card, &status, 5);
1146 if (err) {
1147 pr_err("%s: error %d requesting status\n",
1148 req->rq_disk->disk_name, err);
1149 return MMC_BLK_CMD_ERR;
1150 }
1151
1152 if (status & R1_ERROR) {
1153 pr_err("%s: %s: general error sending status command, card status %#x\n",
1154 req->rq_disk->disk_name, __func__,
1155 status);
1156 gen_err = 1;
1157 }
1158
1159 /* Timeout if the device never becomes ready for data
1160 * and never leaves the program state.
1161 */
1162 if (time_after(jiffies, timeout)) {
1163 pr_err("%s: Card stuck in programming state!"\
1164 " %s %s\n", mmc_hostname(card->host),
1165 req->rq_disk->disk_name, __func__);
1166
1167 return MMC_BLK_CMD_ERR;
1168 }
1169 /*
1170 * Some cards mishandle the status bits,
1171 * so make sure to check both the busy
1172 * indication and the card state.
1173 */
1174 } while (!(status & R1_READY_FOR_DATA) ||
1175 (R1_CURRENT_STATE(status) == R1_STATE_PRG));
1176 }
1177
1178 /* if general error occurs, retry the write operation. */
1179 if (gen_err) {
1180 pr_warn("%s: retrying write for general error\n",
1181 req->rq_disk->disk_name);
1182 return MMC_BLK_RETRY;
1183 }
1184
1185 if (brq->data.error) {
1186 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1187 req->rq_disk->disk_name, brq->data.error,
1188 (unsigned)blk_rq_pos(req),
1189 (unsigned)blk_rq_sectors(req),
1190 brq->cmd.resp[0], brq->stop.resp[0]);
1191
1192 if (rq_data_dir(req) == READ) {
1193 if (ecc_err)
1194 return MMC_BLK_ECC_ERR;
1195 return MMC_BLK_DATA_ERR;
1196 } else {
1197 return MMC_BLK_CMD_ERR;
1198 }
1199 }
1200
1201 if (!brq->data.bytes_xfered)
1202 return MMC_BLK_RETRY;
1203
1204 if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1205 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1206 return MMC_BLK_PARTIAL;
1207 else
1208 return MMC_BLK_SUCCESS;
1209 }
1210
1211 if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1212 return MMC_BLK_PARTIAL;
1213
1214 return MMC_BLK_SUCCESS;
1215 }
1216
1217 static int mmc_blk_packed_err_check(struct mmc_card *card,
1218 struct mmc_async_req *areq)
1219 {
1220 struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1221 mmc_active);
1222 struct request *req = mq_rq->req;
1223 struct mmc_packed *packed = mq_rq->packed;
1224 int err, check, status;
1225 u8 *ext_csd;
1226
1227 BUG_ON(!packed);
1228
1229 packed->retries--;
1230 check = mmc_blk_err_check(card, areq);
1231 err = get_card_status(card, &status, 0);
1232 if (err) {
1233 pr_err("%s: error %d sending status command\n",
1234 req->rq_disk->disk_name, err);
1235 return MMC_BLK_ABORT;
1236 }
1237
1238 if (status & R1_EXCEPTION_EVENT) {
1239 ext_csd = kzalloc(512, GFP_KERNEL);
1240 if (!ext_csd) {
1241 pr_err("%s: unable to allocate buffer for ext_csd\n",
1242 req->rq_disk->disk_name);
1243 return -ENOMEM;
1244 }
1245
1246 err = mmc_send_ext_csd(card, ext_csd);
1247 if (err) {
1248 pr_err("%s: error %d sending ext_csd\n",
1249 req->rq_disk->disk_name, err);
1250 check = MMC_BLK_ABORT;
1251 goto free;
1252 }
1253
1254 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1255 EXT_CSD_PACKED_FAILURE) &&
1256 (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1257 EXT_CSD_PACKED_GENERIC_ERROR)) {
1258 if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1259 EXT_CSD_PACKED_INDEXED_ERROR) {
1260 packed->idx_failure =
1261 ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1262 check = MMC_BLK_PARTIAL;
1263 }
1264 pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1265 "failure index: %d\n",
1266 req->rq_disk->disk_name, packed->nr_entries,
1267 packed->blocks, packed->idx_failure);
1268 }
1269 free:
1270 kfree(ext_csd);
1271 }
1272
1273 return check;
1274 }
1275
1276 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1277 struct mmc_card *card,
1278 int disable_multi,
1279 struct mmc_queue *mq)
1280 {
1281 u32 readcmd, writecmd;
1282 struct mmc_blk_request *brq = &mqrq->brq;
1283 struct request *req = mqrq->req;
1284 struct mmc_blk_data *md = mq->data;
1285 bool do_data_tag;
1286
1287 /*
1288 * Reliable writes are used to implement Forced Unit Access and
1289 * REQ_META accesses, and are supported only on MMCs.
1290 *
1291 * XXX: this really needs a good explanation of why REQ_META
1292 * is treated special.
1293 */
1294 bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1295 (req->cmd_flags & REQ_META)) &&
1296 (rq_data_dir(req) == WRITE) &&
1297 (md->flags & MMC_BLK_REL_WR);
1298
1299 memset(brq, 0, sizeof(struct mmc_blk_request));
1300 brq->mrq.cmd = &brq->cmd;
1301 brq->mrq.data = &brq->data;
1302
1303 brq->cmd.arg = blk_rq_pos(req);
1304 if (!mmc_card_blockaddr(card))
1305 brq->cmd.arg <<= 9;
1306 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1307 brq->data.blksz = 512;
1308 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1309 brq->stop.arg = 0;
1310 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1311 brq->data.blocks = blk_rq_sectors(req);
1312
1313 /*
1314 * The block layer doesn't support all sector count
1315 * restrictions, so we need to be prepared for too big
1316 * requests.
1317 */
1318 if (brq->data.blocks > card->host->max_blk_count)
1319 brq->data.blocks = card->host->max_blk_count;
1320
1321 if (brq->data.blocks > 1) {
1322 /*
1323 * After a read error, we redo the request one sector
1324 * at a time in order to accurately determine which
1325 * sectors can be read successfully.
1326 */
1327 if (disable_multi)
1328 brq->data.blocks = 1;
1329
1330 /* Some controllers can't do multiblock reads due to hw bugs */
1331 if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
1332 rq_data_dir(req) == READ)
1333 brq->data.blocks = 1;
1334 }
1335
1336 if (brq->data.blocks > 1 || do_rel_wr) {
1337 /* SPI multiblock writes terminate using a special
1338 * token, not a STOP_TRANSMISSION request.
1339 */
1340 if (!mmc_host_is_spi(card->host) ||
1341 rq_data_dir(req) == READ)
1342 brq->mrq.stop = &brq->stop;
1343 readcmd = MMC_READ_MULTIPLE_BLOCK;
1344 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1345 } else {
1346 brq->mrq.stop = NULL;
1347 readcmd = MMC_READ_SINGLE_BLOCK;
1348 writecmd = MMC_WRITE_BLOCK;
1349 }
1350 if (rq_data_dir(req) == READ) {
1351 brq->cmd.opcode = readcmd;
1352 brq->data.flags |= MMC_DATA_READ;
1353 } else {
1354 brq->cmd.opcode = writecmd;
1355 brq->data.flags |= MMC_DATA_WRITE;
1356 }
1357
1358 if (do_rel_wr)
1359 mmc_apply_rel_rw(brq, card, req);
1360
1361 /*
1362 * Data tag is used only during writing meta data to speed
1363 * up write and any subsequent read of this meta data
1364 */
1365 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1366 (req->cmd_flags & REQ_META) &&
1367 (rq_data_dir(req) == WRITE) &&
1368 ((brq->data.blocks * brq->data.blksz) >=
1369 card->ext_csd.data_tag_unit_size);
1370
1371 /*
1372 * Pre-defined multi-block transfers are preferable to
1373 * open ended-ones (and necessary for reliable writes).
1374 * However, it is not sufficient to just send CMD23,
1375 * and avoid the final CMD12, as on an error condition
1376 * CMD12 (stop) needs to be sent anyway. This, coupled
1377 * with Auto-CMD23 enhancements provided by some
1378 * hosts, means that the complexity of dealing
1379 * with this is best left to the host. If CMD23 is
1380 * supported by card and host, we'll fill sbc in and let
1381 * the host deal with handling it correctly. This means
1382 * that for hosts that don't expose MMC_CAP_CMD23, no
1383 * change of behavior will be observed.
1384 *
1385 * N.B: Some MMC cards experience perf degradation.
1386 * We'll avoid using CMD23-bounded multiblock writes for
1387 * these, while retaining features like reliable writes.
1388 */
1389 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1390 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1391 do_data_tag)) {
1392 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1393 brq->sbc.arg = brq->data.blocks |
1394 (do_rel_wr ? (1 << 31) : 0) |
1395 (do_data_tag ? (1 << 29) : 0);
1396 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1397 brq->mrq.sbc = &brq->sbc;
1398 }
1399
1400 mmc_set_data_timeout(&brq->data, card);
1401
1402 brq->data.sg = mqrq->sg;
1403 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1404
1405 /*
1406 * Adjust the sg list so it is the same size as the
1407 * request.
1408 */
1409 if (brq->data.blocks != blk_rq_sectors(req)) {
1410 int i, data_size = brq->data.blocks << 9;
1411 struct scatterlist *sg;
1412
1413 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1414 data_size -= sg->length;
1415 if (data_size <= 0) {
1416 sg->length += data_size;
1417 i++;
1418 break;
1419 }
1420 }
1421 brq->data.sg_len = i;
1422 }
1423
1424 mqrq->mmc_active.mrq = &brq->mrq;
1425 mqrq->mmc_active.err_check = mmc_blk_err_check;
1426
1427 mmc_queue_bounce_pre(mqrq);
1428 }
1429
1430 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1431 struct mmc_card *card)
1432 {
1433 unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1434 unsigned int max_seg_sz = queue_max_segment_size(q);
1435 unsigned int len, nr_segs = 0;
1436
1437 do {
1438 len = min(hdr_sz, max_seg_sz);
1439 hdr_sz -= len;
1440 nr_segs++;
1441 } while (hdr_sz);
1442
1443 return nr_segs;
1444 }
1445
1446 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1447 {
1448 struct request_queue *q = mq->queue;
1449 struct mmc_card *card = mq->card;
1450 struct request *cur = req, *next = NULL;
1451 struct mmc_blk_data *md = mq->data;
1452 struct mmc_queue_req *mqrq = mq->mqrq_cur;
1453 bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1454 unsigned int req_sectors = 0, phys_segments = 0;
1455 unsigned int max_blk_count, max_phys_segs;
1456 bool put_back = true;
1457 u8 max_packed_rw = 0;
1458 u8 reqs = 0;
1459
1460 if (!(md->flags & MMC_BLK_PACKED_CMD))
1461 goto no_packed;
1462
1463 if ((rq_data_dir(cur) == WRITE) &&
1464 mmc_host_packed_wr(card->host))
1465 max_packed_rw = card->ext_csd.max_packed_writes;
1466
1467 if (max_packed_rw == 0)
1468 goto no_packed;
1469
1470 if (mmc_req_rel_wr(cur) &&
1471 (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1472 goto no_packed;
1473
1474 if (mmc_large_sector(card) &&
1475 !IS_ALIGNED(blk_rq_sectors(cur), 8))
1476 goto no_packed;
1477
1478 mmc_blk_clear_packed(mqrq);
1479
1480 max_blk_count = min(card->host->max_blk_count,
1481 card->host->max_req_size >> 9);
1482 if (unlikely(max_blk_count > 0xffff))
1483 max_blk_count = 0xffff;
1484
1485 max_phys_segs = queue_max_segments(q);
1486 req_sectors += blk_rq_sectors(cur);
1487 phys_segments += cur->nr_phys_segments;
1488
1489 if (rq_data_dir(cur) == WRITE) {
1490 req_sectors += mmc_large_sector(card) ? 8 : 1;
1491 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1492 }
1493
1494 do {
1495 if (reqs >= max_packed_rw - 1) {
1496 put_back = false;
1497 break;
1498 }
1499
1500 spin_lock_irq(q->queue_lock);
1501 next = blk_fetch_request(q);
1502 spin_unlock_irq(q->queue_lock);
1503 if (!next) {
1504 put_back = false;
1505 break;
1506 }
1507
1508 if (mmc_large_sector(card) &&
1509 !IS_ALIGNED(blk_rq_sectors(next), 8))
1510 break;
1511
1512 if (next->cmd_flags & REQ_DISCARD ||
1513 next->cmd_flags & REQ_FLUSH)
1514 break;
1515
1516 if (rq_data_dir(cur) != rq_data_dir(next))
1517 break;
1518
1519 if (mmc_req_rel_wr(next) &&
1520 (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1521 break;
1522
1523 req_sectors += blk_rq_sectors(next);
1524 if (req_sectors > max_blk_count)
1525 break;
1526
1527 phys_segments += next->nr_phys_segments;
1528 if (phys_segments > max_phys_segs)
1529 break;
1530
1531 list_add_tail(&next->queuelist, &mqrq->packed->list);
1532 cur = next;
1533 reqs++;
1534 } while (1);
1535
1536 if (put_back) {
1537 spin_lock_irq(q->queue_lock);
1538 blk_requeue_request(q, next);
1539 spin_unlock_irq(q->queue_lock);
1540 }
1541
1542 if (reqs > 0) {
1543 list_add(&req->queuelist, &mqrq->packed->list);
1544 mqrq->packed->nr_entries = ++reqs;
1545 mqrq->packed->retries = reqs;
1546 return reqs;
1547 }
1548
1549 no_packed:
1550 mqrq->cmd_type = MMC_PACKED_NONE;
1551 return 0;
1552 }
1553
1554 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1555 struct mmc_card *card,
1556 struct mmc_queue *mq)
1557 {
1558 struct mmc_blk_request *brq = &mqrq->brq;
1559 struct request *req = mqrq->req;
1560 struct request *prq;
1561 struct mmc_blk_data *md = mq->data;
1562 struct mmc_packed *packed = mqrq->packed;
1563 bool do_rel_wr, do_data_tag;
1564 u32 *packed_cmd_hdr;
1565 u8 hdr_blocks;
1566 u8 i = 1;
1567
1568 BUG_ON(!packed);
1569
1570 mqrq->cmd_type = MMC_PACKED_WRITE;
1571 packed->blocks = 0;
1572 packed->idx_failure = MMC_PACKED_NR_IDX;
1573
1574 packed_cmd_hdr = packed->cmd_hdr;
1575 memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1576 packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1577 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1578 hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1579
1580 /*
1581 * Argument for each entry of packed group
1582 */
1583 list_for_each_entry(prq, &packed->list, queuelist) {
1584 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1585 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1586 (prq->cmd_flags & REQ_META) &&
1587 (rq_data_dir(prq) == WRITE) &&
1588 ((brq->data.blocks * brq->data.blksz) >=
1589 card->ext_csd.data_tag_unit_size);
1590 /* Argument of CMD23 */
1591 packed_cmd_hdr[(i * 2)] =
1592 (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1593 (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1594 blk_rq_sectors(prq);
1595 /* Argument of CMD18 or CMD25 */
1596 packed_cmd_hdr[((i * 2)) + 1] =
1597 mmc_card_blockaddr(card) ?
1598 blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1599 packed->blocks += blk_rq_sectors(prq);
1600 i++;
1601 }
1602
1603 memset(brq, 0, sizeof(struct mmc_blk_request));
1604 brq->mrq.cmd = &brq->cmd;
1605 brq->mrq.data = &brq->data;
1606 brq->mrq.sbc = &brq->sbc;
1607 brq->mrq.stop = &brq->stop;
1608
1609 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1610 brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1611 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1612
1613 brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1614 brq->cmd.arg = blk_rq_pos(req);
1615 if (!mmc_card_blockaddr(card))
1616 brq->cmd.arg <<= 9;
1617 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1618
1619 brq->data.blksz = 512;
1620 brq->data.blocks = packed->blocks + hdr_blocks;
1621 brq->data.flags |= MMC_DATA_WRITE;
1622
1623 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1624 brq->stop.arg = 0;
1625 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1626
1627 mmc_set_data_timeout(&brq->data, card);
1628
1629 brq->data.sg = mqrq->sg;
1630 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1631
1632 mqrq->mmc_active.mrq = &brq->mrq;
1633 mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1634
1635 mmc_queue_bounce_pre(mqrq);
1636 }
1637
1638 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1639 struct mmc_blk_request *brq, struct request *req,
1640 int ret)
1641 {
1642 struct mmc_queue_req *mq_rq;
1643 mq_rq = container_of(brq, struct mmc_queue_req, brq);
1644
1645 /*
1646 * If this is an SD card and we're writing, we can first
1647 * mark the known good sectors as ok.
1648 *
1649 * If the card is not SD, we can still ok written sectors
1650 * as reported by the controller (which might be less than
1651 * the real number of written sectors, but never more).
1652 */
1653 if (mmc_card_sd(card)) {
1654 u32 blocks;
1655
1656 blocks = mmc_sd_num_wr_blocks(card);
1657 if (blocks != (u32)-1) {
1658 ret = blk_end_request(req, 0, blocks << 9);
1659 }
1660 } else {
1661 if (!mmc_packed_cmd(mq_rq->cmd_type))
1662 ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1663 }
1664 return ret;
1665 }
1666
1667 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1668 {
1669 struct request *prq;
1670 struct mmc_packed *packed = mq_rq->packed;
1671 int idx = packed->idx_failure, i = 0;
1672 int ret = 0;
1673
1674 BUG_ON(!packed);
1675
1676 while (!list_empty(&packed->list)) {
1677 prq = list_entry_rq(packed->list.next);
1678 if (idx == i) {
1679 /* retry from error index */
1680 packed->nr_entries -= idx;
1681 mq_rq->req = prq;
1682 ret = 1;
1683
1684 if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1685 list_del_init(&prq->queuelist);
1686 mmc_blk_clear_packed(mq_rq);
1687 }
1688 return ret;
1689 }
1690 list_del_init(&prq->queuelist);
1691 blk_end_request(prq, 0, blk_rq_bytes(prq));
1692 i++;
1693 }
1694
1695 mmc_blk_clear_packed(mq_rq);
1696 return ret;
1697 }
1698
1699 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1700 {
1701 struct request *prq;
1702 struct mmc_packed *packed = mq_rq->packed;
1703
1704 BUG_ON(!packed);
1705
1706 while (!list_empty(&packed->list)) {
1707 prq = list_entry_rq(packed->list.next);
1708 list_del_init(&prq->queuelist);
1709 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1710 }
1711
1712 mmc_blk_clear_packed(mq_rq);
1713 }
1714
1715 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1716 struct mmc_queue_req *mq_rq)
1717 {
1718 struct request *prq;
1719 struct request_queue *q = mq->queue;
1720 struct mmc_packed *packed = mq_rq->packed;
1721
1722 BUG_ON(!packed);
1723
1724 while (!list_empty(&packed->list)) {
1725 prq = list_entry_rq(packed->list.prev);
1726 if (prq->queuelist.prev != &packed->list) {
1727 list_del_init(&prq->queuelist);
1728 spin_lock_irq(q->queue_lock);
1729 blk_requeue_request(mq->queue, prq);
1730 spin_unlock_irq(q->queue_lock);
1731 } else {
1732 list_del_init(&prq->queuelist);
1733 }
1734 }
1735
1736 mmc_blk_clear_packed(mq_rq);
1737 }
1738
1739 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1740 {
1741 struct mmc_blk_data *md = mq->data;
1742 struct mmc_card *card = md->queue.card;
1743 struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1744 int ret = 1, disable_multi = 0, retry = 0, type;
1745 enum mmc_blk_status status;
1746 struct mmc_queue_req *mq_rq;
1747 struct request *req = rqc;
1748 struct mmc_async_req *areq;
1749 const u8 packed_nr = 2;
1750 u8 reqs = 0;
1751
1752 if (!rqc && !mq->mqrq_prev->req)
1753 return 0;
1754
1755 if (rqc)
1756 reqs = mmc_blk_prep_packed_list(mq, rqc);
1757
1758 do {
1759 if (rqc) {
1760 /*
1761 * When 4KB native sector is enabled, only 8 blocks
1762 * multiple read or write is allowed
1763 */
1764 if ((brq->data.blocks & 0x07) &&
1765 (card->ext_csd.data_sector_size == 4096)) {
1766 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1767 req->rq_disk->disk_name);
1768 mq_rq = mq->mqrq_cur;
1769 goto cmd_abort;
1770 }
1771
1772 if (reqs >= packed_nr)
1773 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1774 card, mq);
1775 else
1776 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1777 areq = &mq->mqrq_cur->mmc_active;
1778 } else
1779 areq = NULL;
1780 areq = mmc_start_req(card->host, areq, (int *) &status);
1781 if (!areq) {
1782 if (status == MMC_BLK_NEW_REQUEST)
1783 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1784 return 0;
1785 }
1786
1787 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1788 brq = &mq_rq->brq;
1789 req = mq_rq->req;
1790 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1791 mmc_queue_bounce_post(mq_rq);
1792
1793 switch (status) {
1794 case MMC_BLK_SUCCESS:
1795 case MMC_BLK_PARTIAL:
1796 /*
1797 * A block was successfully transferred.
1798 */
1799 mmc_blk_reset_success(md, type);
1800
1801 if (mmc_packed_cmd(mq_rq->cmd_type)) {
1802 ret = mmc_blk_end_packed_req(mq_rq);
1803 break;
1804 } else {
1805 ret = blk_end_request(req, 0,
1806 brq->data.bytes_xfered);
1807 }
1808
1809 /*
1810 * If the blk_end_request function returns non-zero even
1811 * though all data has been transferred and no errors
1812 * were returned by the host controller, it's a bug.
1813 */
1814 if (status == MMC_BLK_SUCCESS && ret) {
1815 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1816 __func__, blk_rq_bytes(req),
1817 brq->data.bytes_xfered);
1818 rqc = NULL;
1819 goto cmd_abort;
1820 }
1821 break;
1822 case MMC_BLK_CMD_ERR:
1823 ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1824 if (!mmc_blk_reset(md, card->host, type))
1825 break;
1826 goto cmd_abort;
1827 case MMC_BLK_RETRY:
1828 if (retry++ < 5)
1829 break;
1830 /* Fall through */
1831 case MMC_BLK_ABORT:
1832 if (!mmc_blk_reset(md, card->host, type))
1833 break;
1834 goto cmd_abort;
1835 case MMC_BLK_DATA_ERR: {
1836 int err;
1837
1838 err = mmc_blk_reset(md, card->host, type);
1839 if (!err)
1840 break;
1841 if (err == -ENODEV ||
1842 mmc_packed_cmd(mq_rq->cmd_type))
1843 goto cmd_abort;
1844 /* Fall through */
1845 }
1846 case MMC_BLK_ECC_ERR:
1847 if (brq->data.blocks > 1) {
1848 /* Redo read one sector at a time */
1849 pr_warning("%s: retrying using single block read\n",
1850 req->rq_disk->disk_name);
1851 disable_multi = 1;
1852 break;
1853 }
1854 /*
1855 * After an error, we redo I/O one sector at a
1856 * time, so we only reach here after trying to
1857 * read a single sector.
1858 */
1859 ret = blk_end_request(req, -EIO,
1860 brq->data.blksz);
1861 if (!ret)
1862 goto start_new_req;
1863 break;
1864 case MMC_BLK_NOMEDIUM:
1865 goto cmd_abort;
1866 default:
1867 pr_err("%s: Unhandled return value (%d)",
1868 req->rq_disk->disk_name, status);
1869 goto cmd_abort;
1870 }
1871
1872 if (ret) {
1873 if (mmc_packed_cmd(mq_rq->cmd_type)) {
1874 if (!mq_rq->packed->retries)
1875 goto cmd_abort;
1876 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
1877 mmc_start_req(card->host,
1878 &mq_rq->mmc_active, NULL);
1879 } else {
1880
1881 /*
1882 * In case of a incomplete request
1883 * prepare it again and resend.
1884 */
1885 mmc_blk_rw_rq_prep(mq_rq, card,
1886 disable_multi, mq);
1887 mmc_start_req(card->host,
1888 &mq_rq->mmc_active, NULL);
1889 }
1890 }
1891 } while (ret);
1892
1893 return 1;
1894
1895 cmd_abort:
1896 if (mmc_packed_cmd(mq_rq->cmd_type)) {
1897 mmc_blk_abort_packed_req(mq_rq);
1898 } else {
1899 if (mmc_card_removed(card))
1900 req->cmd_flags |= REQ_QUIET;
1901 while (ret)
1902 ret = blk_end_request(req, -EIO,
1903 blk_rq_cur_bytes(req));
1904 }
1905
1906 start_new_req:
1907 if (rqc) {
1908 if (mmc_card_removed(card)) {
1909 rqc->cmd_flags |= REQ_QUIET;
1910 blk_end_request_all(rqc, -EIO);
1911 } else {
1912 /*
1913 * If current request is packed, it needs to put back.
1914 */
1915 if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
1916 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
1917
1918 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1919 mmc_start_req(card->host,
1920 &mq->mqrq_cur->mmc_active, NULL);
1921 }
1922 }
1923
1924 return 0;
1925 }
1926
1927 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1928 {
1929 int ret;
1930 struct mmc_blk_data *md = mq->data;
1931 struct mmc_card *card = md->queue.card;
1932 struct mmc_host *host = card->host;
1933 unsigned long flags;
1934 unsigned int cmd_flags = req ? req->cmd_flags : 0;
1935
1936 if (req && !mq->mqrq_prev->req)
1937 /* claim host only for the first request */
1938 mmc_claim_host(card->host);
1939
1940 ret = mmc_blk_part_switch(card, md);
1941 if (ret) {
1942 if (req) {
1943 blk_end_request_all(req, -EIO);
1944 }
1945 ret = 0;
1946 goto out;
1947 }
1948
1949 mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
1950 if (cmd_flags & REQ_DISCARD) {
1951 /* complete ongoing async transfer before issuing discard */
1952 if (card->host->areq)
1953 mmc_blk_issue_rw_rq(mq, NULL);
1954 if (req->cmd_flags & REQ_SECURE &&
1955 !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
1956 ret = mmc_blk_issue_secdiscard_rq(mq, req);
1957 else
1958 ret = mmc_blk_issue_discard_rq(mq, req);
1959 } else if (cmd_flags & REQ_FLUSH) {
1960 /* complete ongoing async transfer before issuing flush */
1961 if (card->host->areq)
1962 mmc_blk_issue_rw_rq(mq, NULL);
1963 ret = mmc_blk_issue_flush(mq, req);
1964 } else {
1965 if (!req && host->areq) {
1966 spin_lock_irqsave(&host->context_info.lock, flags);
1967 host->context_info.is_waiting_last_req = true;
1968 spin_unlock_irqrestore(&host->context_info.lock, flags);
1969 }
1970 ret = mmc_blk_issue_rw_rq(mq, req);
1971 }
1972
1973 out:
1974 if ((!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST)) ||
1975 (cmd_flags & MMC_REQ_SPECIAL_MASK))
1976 /*
1977 * Release host when there are no more requests
1978 * and after special request(discard, flush) is done.
1979 * In case sepecial request, there is no reentry to
1980 * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
1981 */
1982 mmc_release_host(card->host);
1983 return ret;
1984 }
1985
1986 static inline int mmc_blk_readonly(struct mmc_card *card)
1987 {
1988 return mmc_card_readonly(card) ||
1989 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
1990 }
1991
1992 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
1993 struct device *parent,
1994 sector_t size,
1995 bool default_ro,
1996 const char *subname,
1997 int area_type)
1998 {
1999 struct mmc_blk_data *md;
2000 int devidx, ret;
2001
2002 devidx = find_first_zero_bit(dev_use, max_devices);
2003 if (devidx >= max_devices)
2004 return ERR_PTR(-ENOSPC);
2005 __set_bit(devidx, dev_use);
2006
2007 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2008 if (!md) {
2009 ret = -ENOMEM;
2010 goto out;
2011 }
2012
2013 /*
2014 * !subname implies we are creating main mmc_blk_data that will be
2015 * associated with mmc_card with mmc_set_drvdata. Due to device
2016 * partitions, devidx will not coincide with a per-physical card
2017 * index anymore so we keep track of a name index.
2018 */
2019 if (!subname) {
2020 md->name_idx = find_first_zero_bit(name_use, max_devices);
2021 __set_bit(md->name_idx, name_use);
2022 } else
2023 md->name_idx = ((struct mmc_blk_data *)
2024 dev_to_disk(parent)->private_data)->name_idx;
2025
2026 md->area_type = area_type;
2027
2028 /*
2029 * Set the read-only status based on the supported commands
2030 * and the write protect switch.
2031 */
2032 md->read_only = mmc_blk_readonly(card);
2033
2034 md->disk = alloc_disk(perdev_minors);
2035 if (md->disk == NULL) {
2036 ret = -ENOMEM;
2037 goto err_kfree;
2038 }
2039
2040 spin_lock_init(&md->lock);
2041 INIT_LIST_HEAD(&md->part);
2042 md->usage = 1;
2043
2044 ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2045 if (ret)
2046 goto err_putdisk;
2047
2048 md->queue.issue_fn = mmc_blk_issue_rq;
2049 md->queue.data = md;
2050
2051 md->disk->major = MMC_BLOCK_MAJOR;
2052 md->disk->first_minor = devidx * perdev_minors;
2053 md->disk->fops = &mmc_bdops;
2054 md->disk->private_data = md;
2055 md->disk->queue = md->queue.queue;
2056 md->disk->driverfs_dev = parent;
2057 set_disk_ro(md->disk, md->read_only || default_ro);
2058 if (area_type & MMC_BLK_DATA_AREA_RPMB)
2059 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2060
2061 /*
2062 * As discussed on lkml, GENHD_FL_REMOVABLE should:
2063 *
2064 * - be set for removable media with permanent block devices
2065 * - be unset for removable block devices with permanent media
2066 *
2067 * Since MMC block devices clearly fall under the second
2068 * case, we do not set GENHD_FL_REMOVABLE. Userspace
2069 * should use the block device creation/destruction hotplug
2070 * messages to tell when the card is present.
2071 */
2072
2073 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2074 "mmcblk%d%s", md->name_idx, subname ? subname : "");
2075
2076 if (mmc_card_mmc(card))
2077 blk_queue_logical_block_size(md->queue.queue,
2078 card->ext_csd.data_sector_size);
2079 else
2080 blk_queue_logical_block_size(md->queue.queue, 512);
2081
2082 set_capacity(md->disk, size);
2083
2084 if (mmc_host_cmd23(card->host)) {
2085 if (mmc_card_mmc(card) ||
2086 (mmc_card_sd(card) &&
2087 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2088 md->flags |= MMC_BLK_CMD23;
2089 }
2090
2091 if (mmc_card_mmc(card) &&
2092 md->flags & MMC_BLK_CMD23 &&
2093 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2094 card->ext_csd.rel_sectors)) {
2095 md->flags |= MMC_BLK_REL_WR;
2096 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2097 }
2098
2099 if (mmc_card_mmc(card) &&
2100 (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2101 (md->flags & MMC_BLK_CMD23) &&
2102 card->ext_csd.packed_event_en) {
2103 if (!mmc_packed_init(&md->queue, card))
2104 md->flags |= MMC_BLK_PACKED_CMD;
2105 }
2106
2107 return md;
2108
2109 err_putdisk:
2110 put_disk(md->disk);
2111 err_kfree:
2112 kfree(md);
2113 out:
2114 return ERR_PTR(ret);
2115 }
2116
2117 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2118 {
2119 sector_t size;
2120 struct mmc_blk_data *md;
2121
2122 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2123 /*
2124 * The EXT_CSD sector count is in number or 512 byte
2125 * sectors.
2126 */
2127 size = card->ext_csd.sectors;
2128 } else {
2129 /*
2130 * The CSD capacity field is in units of read_blkbits.
2131 * set_capacity takes units of 512 bytes.
2132 */
2133 size = card->csd.capacity << (card->csd.read_blkbits - 9);
2134 }
2135
2136 md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2137 MMC_BLK_DATA_AREA_MAIN);
2138 return md;
2139 }
2140
2141 static int mmc_blk_alloc_part(struct mmc_card *card,
2142 struct mmc_blk_data *md,
2143 unsigned int part_type,
2144 sector_t size,
2145 bool default_ro,
2146 const char *subname,
2147 int area_type)
2148 {
2149 char cap_str[10];
2150 struct mmc_blk_data *part_md;
2151
2152 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2153 subname, area_type);
2154 if (IS_ERR(part_md))
2155 return PTR_ERR(part_md);
2156 part_md->part_type = part_type;
2157 list_add(&part_md->part, &md->part);
2158
2159 string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
2160 cap_str, sizeof(cap_str));
2161 pr_info("%s: %s %s partition %u %s\n",
2162 part_md->disk->disk_name, mmc_card_id(card),
2163 mmc_card_name(card), part_md->part_type, cap_str);
2164 return 0;
2165 }
2166
2167 /* MMC Physical partitions consist of two boot partitions and
2168 * up to four general purpose partitions.
2169 * For each partition enabled in EXT_CSD a block device will be allocatedi
2170 * to provide access to the partition.
2171 */
2172
2173 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2174 {
2175 int idx, ret = 0;
2176
2177 if (!mmc_card_mmc(card))
2178 return 0;
2179
2180 for (idx = 0; idx < card->nr_parts; idx++) {
2181 if (card->part[idx].size) {
2182 ret = mmc_blk_alloc_part(card, md,
2183 card->part[idx].part_cfg,
2184 card->part[idx].size >> 9,
2185 card->part[idx].force_ro,
2186 card->part[idx].name,
2187 card->part[idx].area_type);
2188 if (ret)
2189 return ret;
2190 }
2191 }
2192
2193 return ret;
2194 }
2195
2196 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2197 {
2198 struct mmc_card *card;
2199
2200 if (md) {
2201 card = md->queue.card;
2202 if (md->disk->flags & GENHD_FL_UP) {
2203 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2204 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2205 card->ext_csd.boot_ro_lockable)
2206 device_remove_file(disk_to_dev(md->disk),
2207 &md->power_ro_lock);
2208
2209 /* Stop new requests from getting into the queue */
2210 del_gendisk(md->disk);
2211 }
2212
2213 /* Then flush out any already in there */
2214 mmc_cleanup_queue(&md->queue);
2215 if (md->flags & MMC_BLK_PACKED_CMD)
2216 mmc_packed_clean(&md->queue);
2217 mmc_blk_put(md);
2218 }
2219 }
2220
2221 static void mmc_blk_remove_parts(struct mmc_card *card,
2222 struct mmc_blk_data *md)
2223 {
2224 struct list_head *pos, *q;
2225 struct mmc_blk_data *part_md;
2226
2227 __clear_bit(md->name_idx, name_use);
2228 list_for_each_safe(pos, q, &md->part) {
2229 part_md = list_entry(pos, struct mmc_blk_data, part);
2230 list_del(pos);
2231 mmc_blk_remove_req(part_md);
2232 }
2233 }
2234
2235 static int mmc_add_disk(struct mmc_blk_data *md)
2236 {
2237 int ret;
2238 struct mmc_card *card = md->queue.card;
2239
2240 add_disk(md->disk);
2241 md->force_ro.show = force_ro_show;
2242 md->force_ro.store = force_ro_store;
2243 sysfs_attr_init(&md->force_ro.attr);
2244 md->force_ro.attr.name = "force_ro";
2245 md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2246 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2247 if (ret)
2248 goto force_ro_fail;
2249
2250 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2251 card->ext_csd.boot_ro_lockable) {
2252 umode_t mode;
2253
2254 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2255 mode = S_IRUGO;
2256 else
2257 mode = S_IRUGO | S_IWUSR;
2258
2259 md->power_ro_lock.show = power_ro_lock_show;
2260 md->power_ro_lock.store = power_ro_lock_store;
2261 sysfs_attr_init(&md->power_ro_lock.attr);
2262 md->power_ro_lock.attr.mode = mode;
2263 md->power_ro_lock.attr.name =
2264 "ro_lock_until_next_power_on";
2265 ret = device_create_file(disk_to_dev(md->disk),
2266 &md->power_ro_lock);
2267 if (ret)
2268 goto power_ro_lock_fail;
2269 }
2270 return ret;
2271
2272 power_ro_lock_fail:
2273 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2274 force_ro_fail:
2275 del_gendisk(md->disk);
2276
2277 return ret;
2278 }
2279
2280 #define CID_MANFID_SANDISK 0x2
2281 #define CID_MANFID_TOSHIBA 0x11
2282 #define CID_MANFID_MICRON 0x13
2283 #define CID_MANFID_SAMSUNG 0x15
2284
2285 static const struct mmc_fixup blk_fixups[] =
2286 {
2287 MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2288 MMC_QUIRK_INAND_CMD38),
2289 MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2290 MMC_QUIRK_INAND_CMD38),
2291 MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2292 MMC_QUIRK_INAND_CMD38),
2293 MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2294 MMC_QUIRK_INAND_CMD38),
2295 MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2296 MMC_QUIRK_INAND_CMD38),
2297
2298 /*
2299 * Some MMC cards experience performance degradation with CMD23
2300 * instead of CMD12-bounded multiblock transfers. For now we'll
2301 * black list what's bad...
2302 * - Certain Toshiba cards.
2303 *
2304 * N.B. This doesn't affect SD cards.
2305 */
2306 MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2307 MMC_QUIRK_BLK_NO_CMD23),
2308 MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2309 MMC_QUIRK_BLK_NO_CMD23),
2310 MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2311 MMC_QUIRK_BLK_NO_CMD23),
2312
2313 /*
2314 * Some Micron MMC cards needs longer data read timeout than
2315 * indicated in CSD.
2316 */
2317 MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2318 MMC_QUIRK_LONG_READ_TIME),
2319
2320 /*
2321 * On these Samsung MoviNAND parts, performing secure erase or
2322 * secure trim can result in unrecoverable corruption due to a
2323 * firmware bug.
2324 */
2325 MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2326 MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2327 MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2328 MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2329 MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2330 MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2331 MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2332 MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2333 MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2334 MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2335 MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2336 MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2337 MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2338 MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2339 MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2340 MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2341
2342 END_FIXUP
2343 };
2344
2345 static int mmc_blk_probe(struct mmc_card *card)
2346 {
2347 struct mmc_blk_data *md, *part_md;
2348 char cap_str[10];
2349
2350 /*
2351 * Check that the card supports the command class(es) we need.
2352 */
2353 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2354 return -ENODEV;
2355
2356 md = mmc_blk_alloc(card);
2357 if (IS_ERR(md))
2358 return PTR_ERR(md);
2359
2360 string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
2361 cap_str, sizeof(cap_str));
2362 pr_info("%s: %s %s %s %s\n",
2363 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2364 cap_str, md->read_only ? "(ro)" : "");
2365
2366 if (mmc_blk_alloc_parts(card, md))
2367 goto out;
2368
2369 mmc_set_drvdata(card, md);
2370 mmc_fixup_device(card, blk_fixups);
2371
2372 if (mmc_add_disk(md))
2373 goto out;
2374
2375 list_for_each_entry(part_md, &md->part, part) {
2376 if (mmc_add_disk(part_md))
2377 goto out;
2378 }
2379 return 0;
2380
2381 out:
2382 mmc_blk_remove_parts(card, md);
2383 mmc_blk_remove_req(md);
2384 return 0;
2385 }
2386
2387 static void mmc_blk_remove(struct mmc_card *card)
2388 {
2389 struct mmc_blk_data *md = mmc_get_drvdata(card);
2390
2391 mmc_blk_remove_parts(card, md);
2392 mmc_claim_host(card->host);
2393 mmc_blk_part_switch(card, md);
2394 mmc_release_host(card->host);
2395 mmc_blk_remove_req(md);
2396 mmc_set_drvdata(card, NULL);
2397 }
2398
2399 #ifdef CONFIG_PM
2400 static int mmc_blk_suspend(struct mmc_card *card)
2401 {
2402 struct mmc_blk_data *part_md;
2403 struct mmc_blk_data *md = mmc_get_drvdata(card);
2404
2405 if (md) {
2406 mmc_queue_suspend(&md->queue);
2407 list_for_each_entry(part_md, &md->part, part) {
2408 mmc_queue_suspend(&part_md->queue);
2409 }
2410 }
2411 return 0;
2412 }
2413
2414 static int mmc_blk_resume(struct mmc_card *card)
2415 {
2416 struct mmc_blk_data *part_md;
2417 struct mmc_blk_data *md = mmc_get_drvdata(card);
2418
2419 if (md) {
2420 /*
2421 * Resume involves the card going into idle state,
2422 * so current partition is always the main one.
2423 */
2424 md->part_curr = md->part_type;
2425 mmc_queue_resume(&md->queue);
2426 list_for_each_entry(part_md, &md->part, part) {
2427 mmc_queue_resume(&part_md->queue);
2428 }
2429 }
2430 return 0;
2431 }
2432 #else
2433 #define mmc_blk_suspend NULL
2434 #define mmc_blk_resume NULL
2435 #endif
2436
2437 static struct mmc_driver mmc_driver = {
2438 .drv = {
2439 .name = "mmcblk",
2440 },
2441 .probe = mmc_blk_probe,
2442 .remove = mmc_blk_remove,
2443 .suspend = mmc_blk_suspend,
2444 .resume = mmc_blk_resume,
2445 };
2446
2447 static int __init mmc_blk_init(void)
2448 {
2449 int res;
2450
2451 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2452 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2453
2454 max_devices = 256 / perdev_minors;
2455
2456 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2457 if (res)
2458 goto out;
2459
2460 res = mmc_register_driver(&mmc_driver);
2461 if (res)
2462 goto out2;
2463
2464 return 0;
2465 out2:
2466 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2467 out:
2468 return res;
2469 }
2470
2471 static void __exit mmc_blk_exit(void)
2472 {
2473 mmc_unregister_driver(&mmc_driver);
2474 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2475 }
2476
2477 module_init(mmc_blk_init);
2478 module_exit(mmc_blk_exit);
2479
2480 MODULE_LICENSE("GPL");
2481 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2482
kernel source for telekom puls (alcatel/mediatek)