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block: introduce new block status code type
[mirror_ubuntu-bionic-kernel.git] / drivers / mmc / core / 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 #include <linux/pm_runtime.h>
38 #include <linux/idr.h>
39
40 #include <linux/mmc/ioctl.h>
41 #include <linux/mmc/card.h>
42 #include <linux/mmc/host.h>
43 #include <linux/mmc/mmc.h>
44 #include <linux/mmc/sd.h>
45
46 #include <linux/uaccess.h>
47
48 #include "queue.h"
49 #include "block.h"
50 #include "core.h"
51 #include "card.h"
52 #include "host.h"
53 #include "bus.h"
54 #include "mmc_ops.h"
55 #include "quirks.h"
56 #include "sd_ops.h"
57
58 MODULE_ALIAS("mmc:block");
59 #ifdef MODULE_PARAM_PREFIX
60 #undef MODULE_PARAM_PREFIX
61 #endif
62 #define MODULE_PARAM_PREFIX "mmcblk."
63
64 #define MMC_BLK_TIMEOUT_MS (10 * 60 * 1000) /* 10 minute timeout */
65 #define MMC_SANITIZE_REQ_TIMEOUT 240000
66 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
67
68 #define mmc_req_rel_wr(req) ((req->cmd_flags & REQ_FUA) && \
69 (rq_data_dir(req) == WRITE))
70 static DEFINE_MUTEX(block_mutex);
71
72 /*
73 * The defaults come from config options but can be overriden by module
74 * or bootarg options.
75 */
76 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
77
78 /*
79 * We've only got one major, so number of mmcblk devices is
80 * limited to (1 << 20) / number of minors per device. It is also
81 * limited by the MAX_DEVICES below.
82 */
83 static int max_devices;
84
85 #define MAX_DEVICES 256
86
87 static DEFINE_IDA(mmc_blk_ida);
88
89 /*
90 * There is one mmc_blk_data per slot.
91 */
92 struct mmc_blk_data {
93 spinlock_t lock;
94 struct device *parent;
95 struct gendisk *disk;
96 struct mmc_queue queue;
97 struct list_head part;
98
99 unsigned int flags;
100 #define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
101 #define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */
102
103 unsigned int usage;
104 unsigned int read_only;
105 unsigned int part_type;
106 unsigned int reset_done;
107 #define MMC_BLK_READ BIT(0)
108 #define MMC_BLK_WRITE BIT(1)
109 #define MMC_BLK_DISCARD BIT(2)
110 #define MMC_BLK_SECDISCARD BIT(3)
111
112 /*
113 * Only set in main mmc_blk_data associated
114 * with mmc_card with dev_set_drvdata, and keeps
115 * track of the current selected device partition.
116 */
117 unsigned int part_curr;
118 struct device_attribute force_ro;
119 struct device_attribute power_ro_lock;
120 int area_type;
121 };
122
123 static DEFINE_MUTEX(open_lock);
124
125 module_param(perdev_minors, int, 0444);
126 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
127
128 static inline int mmc_blk_part_switch(struct mmc_card *card,
129 struct mmc_blk_data *md);
130 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
131
132 static void mmc_blk_requeue(struct request_queue *q, struct request *req)
133 {
134 spin_lock_irq(q->queue_lock);
135 blk_requeue_request(q, req);
136 spin_unlock_irq(q->queue_lock);
137 }
138
139 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
140 {
141 struct mmc_blk_data *md;
142
143 mutex_lock(&open_lock);
144 md = disk->private_data;
145 if (md && md->usage == 0)
146 md = NULL;
147 if (md)
148 md->usage++;
149 mutex_unlock(&open_lock);
150
151 return md;
152 }
153
154 static inline int mmc_get_devidx(struct gendisk *disk)
155 {
156 int devidx = disk->first_minor / perdev_minors;
157 return devidx;
158 }
159
160 static void mmc_blk_put(struct mmc_blk_data *md)
161 {
162 mutex_lock(&open_lock);
163 md->usage--;
164 if (md->usage == 0) {
165 int devidx = mmc_get_devidx(md->disk);
166 blk_cleanup_queue(md->queue.queue);
167 ida_simple_remove(&mmc_blk_ida, devidx);
168 put_disk(md->disk);
169 kfree(md);
170 }
171 mutex_unlock(&open_lock);
172 }
173
174 static ssize_t power_ro_lock_show(struct device *dev,
175 struct device_attribute *attr, char *buf)
176 {
177 int ret;
178 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
179 struct mmc_card *card = md->queue.card;
180 int locked = 0;
181
182 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
183 locked = 2;
184 else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
185 locked = 1;
186
187 ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
188
189 mmc_blk_put(md);
190
191 return ret;
192 }
193
194 static ssize_t power_ro_lock_store(struct device *dev,
195 struct device_attribute *attr, const char *buf, size_t count)
196 {
197 int ret;
198 struct mmc_blk_data *md, *part_md;
199 struct mmc_card *card;
200 unsigned long set;
201
202 if (kstrtoul(buf, 0, &set))
203 return -EINVAL;
204
205 if (set != 1)
206 return count;
207
208 md = mmc_blk_get(dev_to_disk(dev));
209 card = md->queue.card;
210
211 mmc_get_card(card);
212
213 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
214 card->ext_csd.boot_ro_lock |
215 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
216 card->ext_csd.part_time);
217 if (ret)
218 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
219 else
220 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
221
222 mmc_put_card(card);
223
224 if (!ret) {
225 pr_info("%s: Locking boot partition ro until next power on\n",
226 md->disk->disk_name);
227 set_disk_ro(md->disk, 1);
228
229 list_for_each_entry(part_md, &md->part, part)
230 if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
231 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
232 set_disk_ro(part_md->disk, 1);
233 }
234 }
235
236 mmc_blk_put(md);
237 return count;
238 }
239
240 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
241 char *buf)
242 {
243 int ret;
244 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
245
246 ret = snprintf(buf, PAGE_SIZE, "%d\n",
247 get_disk_ro(dev_to_disk(dev)) ^
248 md->read_only);
249 mmc_blk_put(md);
250 return ret;
251 }
252
253 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
254 const char *buf, size_t count)
255 {
256 int ret;
257 char *end;
258 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
259 unsigned long set = simple_strtoul(buf, &end, 0);
260 if (end == buf) {
261 ret = -EINVAL;
262 goto out;
263 }
264
265 set_disk_ro(dev_to_disk(dev), set || md->read_only);
266 ret = count;
267 out:
268 mmc_blk_put(md);
269 return ret;
270 }
271
272 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
273 {
274 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
275 int ret = -ENXIO;
276
277 mutex_lock(&block_mutex);
278 if (md) {
279 if (md->usage == 2)
280 check_disk_change(bdev);
281 ret = 0;
282
283 if ((mode & FMODE_WRITE) && md->read_only) {
284 mmc_blk_put(md);
285 ret = -EROFS;
286 }
287 }
288 mutex_unlock(&block_mutex);
289
290 return ret;
291 }
292
293 static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
294 {
295 struct mmc_blk_data *md = disk->private_data;
296
297 mutex_lock(&block_mutex);
298 mmc_blk_put(md);
299 mutex_unlock(&block_mutex);
300 }
301
302 static int
303 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
304 {
305 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
306 geo->heads = 4;
307 geo->sectors = 16;
308 return 0;
309 }
310
311 struct mmc_blk_ioc_data {
312 struct mmc_ioc_cmd ic;
313 unsigned char *buf;
314 u64 buf_bytes;
315 };
316
317 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
318 struct mmc_ioc_cmd __user *user)
319 {
320 struct mmc_blk_ioc_data *idata;
321 int err;
322
323 idata = kmalloc(sizeof(*idata), GFP_KERNEL);
324 if (!idata) {
325 err = -ENOMEM;
326 goto out;
327 }
328
329 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
330 err = -EFAULT;
331 goto idata_err;
332 }
333
334 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
335 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
336 err = -EOVERFLOW;
337 goto idata_err;
338 }
339
340 if (!idata->buf_bytes) {
341 idata->buf = NULL;
342 return idata;
343 }
344
345 idata->buf = kmalloc(idata->buf_bytes, GFP_KERNEL);
346 if (!idata->buf) {
347 err = -ENOMEM;
348 goto idata_err;
349 }
350
351 if (copy_from_user(idata->buf, (void __user *)(unsigned long)
352 idata->ic.data_ptr, idata->buf_bytes)) {
353 err = -EFAULT;
354 goto copy_err;
355 }
356
357 return idata;
358
359 copy_err:
360 kfree(idata->buf);
361 idata_err:
362 kfree(idata);
363 out:
364 return ERR_PTR(err);
365 }
366
367 static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
368 struct mmc_blk_ioc_data *idata)
369 {
370 struct mmc_ioc_cmd *ic = &idata->ic;
371
372 if (copy_to_user(&(ic_ptr->response), ic->response,
373 sizeof(ic->response)))
374 return -EFAULT;
375
376 if (!idata->ic.write_flag) {
377 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
378 idata->buf, idata->buf_bytes))
379 return -EFAULT;
380 }
381
382 return 0;
383 }
384
385 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
386 u32 retries_max)
387 {
388 int err;
389 u32 retry_count = 0;
390
391 if (!status || !retries_max)
392 return -EINVAL;
393
394 do {
395 err = get_card_status(card, status, 5);
396 if (err)
397 break;
398
399 if (!R1_STATUS(*status) &&
400 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
401 break; /* RPMB programming operation complete */
402
403 /*
404 * Rechedule to give the MMC device a chance to continue
405 * processing the previous command without being polled too
406 * frequently.
407 */
408 usleep_range(1000, 5000);
409 } while (++retry_count < retries_max);
410
411 if (retry_count == retries_max)
412 err = -EPERM;
413
414 return err;
415 }
416
417 static int ioctl_do_sanitize(struct mmc_card *card)
418 {
419 int err;
420
421 if (!mmc_can_sanitize(card)) {
422 pr_warn("%s: %s - SANITIZE is not supported\n",
423 mmc_hostname(card->host), __func__);
424 err = -EOPNOTSUPP;
425 goto out;
426 }
427
428 pr_debug("%s: %s - SANITIZE IN PROGRESS...\n",
429 mmc_hostname(card->host), __func__);
430
431 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
432 EXT_CSD_SANITIZE_START, 1,
433 MMC_SANITIZE_REQ_TIMEOUT);
434
435 if (err)
436 pr_err("%s: %s - EXT_CSD_SANITIZE_START failed. err=%d\n",
437 mmc_hostname(card->host), __func__, err);
438
439 pr_debug("%s: %s - SANITIZE COMPLETED\n", mmc_hostname(card->host),
440 __func__);
441 out:
442 return err;
443 }
444
445 static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
446 struct mmc_blk_ioc_data *idata)
447 {
448 struct mmc_command cmd = {};
449 struct mmc_data data = {};
450 struct mmc_request mrq = {};
451 struct scatterlist sg;
452 int err;
453 int is_rpmb = false;
454 u32 status = 0;
455
456 if (!card || !md || !idata)
457 return -EINVAL;
458
459 if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
460 is_rpmb = true;
461
462 cmd.opcode = idata->ic.opcode;
463 cmd.arg = idata->ic.arg;
464 cmd.flags = idata->ic.flags;
465
466 if (idata->buf_bytes) {
467 data.sg = &sg;
468 data.sg_len = 1;
469 data.blksz = idata->ic.blksz;
470 data.blocks = idata->ic.blocks;
471
472 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
473
474 if (idata->ic.write_flag)
475 data.flags = MMC_DATA_WRITE;
476 else
477 data.flags = MMC_DATA_READ;
478
479 /* data.flags must already be set before doing this. */
480 mmc_set_data_timeout(&data, card);
481
482 /* Allow overriding the timeout_ns for empirical tuning. */
483 if (idata->ic.data_timeout_ns)
484 data.timeout_ns = idata->ic.data_timeout_ns;
485
486 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
487 /*
488 * Pretend this is a data transfer and rely on the
489 * host driver to compute timeout. When all host
490 * drivers support cmd.cmd_timeout for R1B, this
491 * can be changed to:
492 *
493 * mrq.data = NULL;
494 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
495 */
496 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
497 }
498
499 mrq.data = &data;
500 }
501
502 mrq.cmd = &cmd;
503
504 err = mmc_blk_part_switch(card, md);
505 if (err)
506 return err;
507
508 if (idata->ic.is_acmd) {
509 err = mmc_app_cmd(card->host, card);
510 if (err)
511 return err;
512 }
513
514 if (is_rpmb) {
515 err = mmc_set_blockcount(card, data.blocks,
516 idata->ic.write_flag & (1 << 31));
517 if (err)
518 return err;
519 }
520
521 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
522 (cmd.opcode == MMC_SWITCH)) {
523 err = ioctl_do_sanitize(card);
524
525 if (err)
526 pr_err("%s: ioctl_do_sanitize() failed. err = %d",
527 __func__, err);
528
529 return err;
530 }
531
532 mmc_wait_for_req(card->host, &mrq);
533
534 if (cmd.error) {
535 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
536 __func__, cmd.error);
537 return cmd.error;
538 }
539 if (data.error) {
540 dev_err(mmc_dev(card->host), "%s: data error %d\n",
541 __func__, data.error);
542 return data.error;
543 }
544
545 /*
546 * According to the SD specs, some commands require a delay after
547 * issuing the command.
548 */
549 if (idata->ic.postsleep_min_us)
550 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
551
552 memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
553
554 if (is_rpmb) {
555 /*
556 * Ensure RPMB command has completed by polling CMD13
557 * "Send Status".
558 */
559 err = ioctl_rpmb_card_status_poll(card, &status, 5);
560 if (err)
561 dev_err(mmc_dev(card->host),
562 "%s: Card Status=0x%08X, error %d\n",
563 __func__, status, err);
564 }
565
566 return err;
567 }
568
569 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
570 struct mmc_ioc_cmd __user *ic_ptr)
571 {
572 struct mmc_blk_ioc_data *idata;
573 struct mmc_blk_data *md;
574 struct mmc_card *card;
575 int err = 0, ioc_err = 0;
576
577 /*
578 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
579 * whole block device, not on a partition. This prevents overspray
580 * between sibling partitions.
581 */
582 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
583 return -EPERM;
584
585 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
586 if (IS_ERR(idata))
587 return PTR_ERR(idata);
588
589 md = mmc_blk_get(bdev->bd_disk);
590 if (!md) {
591 err = -EINVAL;
592 goto cmd_err;
593 }
594
595 card = md->queue.card;
596 if (IS_ERR(card)) {
597 err = PTR_ERR(card);
598 goto cmd_done;
599 }
600
601 mmc_get_card(card);
602
603 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
604
605 /* Always switch back to main area after RPMB access */
606 if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
607 mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
608
609 mmc_put_card(card);
610
611 err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
612
613 cmd_done:
614 mmc_blk_put(md);
615 cmd_err:
616 kfree(idata->buf);
617 kfree(idata);
618 return ioc_err ? ioc_err : err;
619 }
620
621 static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
622 struct mmc_ioc_multi_cmd __user *user)
623 {
624 struct mmc_blk_ioc_data **idata = NULL;
625 struct mmc_ioc_cmd __user *cmds = user->cmds;
626 struct mmc_card *card;
627 struct mmc_blk_data *md;
628 int i, err = 0, ioc_err = 0;
629 __u64 num_of_cmds;
630
631 /*
632 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
633 * whole block device, not on a partition. This prevents overspray
634 * between sibling partitions.
635 */
636 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
637 return -EPERM;
638
639 if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
640 sizeof(num_of_cmds)))
641 return -EFAULT;
642
643 if (num_of_cmds > MMC_IOC_MAX_CMDS)
644 return -EINVAL;
645
646 idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
647 if (!idata)
648 return -ENOMEM;
649
650 for (i = 0; i < num_of_cmds; i++) {
651 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
652 if (IS_ERR(idata[i])) {
653 err = PTR_ERR(idata[i]);
654 num_of_cmds = i;
655 goto cmd_err;
656 }
657 }
658
659 md = mmc_blk_get(bdev->bd_disk);
660 if (!md) {
661 err = -EINVAL;
662 goto cmd_err;
663 }
664
665 card = md->queue.card;
666 if (IS_ERR(card)) {
667 err = PTR_ERR(card);
668 goto cmd_done;
669 }
670
671 mmc_get_card(card);
672
673 for (i = 0; i < num_of_cmds && !ioc_err; i++)
674 ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
675
676 /* Always switch back to main area after RPMB access */
677 if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
678 mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
679
680 mmc_put_card(card);
681
682 /* copy to user if data and response */
683 for (i = 0; i < num_of_cmds && !err; i++)
684 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
685
686 cmd_done:
687 mmc_blk_put(md);
688 cmd_err:
689 for (i = 0; i < num_of_cmds; i++) {
690 kfree(idata[i]->buf);
691 kfree(idata[i]);
692 }
693 kfree(idata);
694 return ioc_err ? ioc_err : err;
695 }
696
697 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
698 unsigned int cmd, unsigned long arg)
699 {
700 switch (cmd) {
701 case MMC_IOC_CMD:
702 return mmc_blk_ioctl_cmd(bdev,
703 (struct mmc_ioc_cmd __user *)arg);
704 case MMC_IOC_MULTI_CMD:
705 return mmc_blk_ioctl_multi_cmd(bdev,
706 (struct mmc_ioc_multi_cmd __user *)arg);
707 default:
708 return -EINVAL;
709 }
710 }
711
712 #ifdef CONFIG_COMPAT
713 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
714 unsigned int cmd, unsigned long arg)
715 {
716 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
717 }
718 #endif
719
720 static const struct block_device_operations mmc_bdops = {
721 .open = mmc_blk_open,
722 .release = mmc_blk_release,
723 .getgeo = mmc_blk_getgeo,
724 .owner = THIS_MODULE,
725 .ioctl = mmc_blk_ioctl,
726 #ifdef CONFIG_COMPAT
727 .compat_ioctl = mmc_blk_compat_ioctl,
728 #endif
729 };
730
731 static int mmc_blk_part_switch_pre(struct mmc_card *card,
732 unsigned int part_type)
733 {
734 int ret = 0;
735
736 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
737 if (card->ext_csd.cmdq_en) {
738 ret = mmc_cmdq_disable(card);
739 if (ret)
740 return ret;
741 }
742 mmc_retune_pause(card->host);
743 }
744
745 return ret;
746 }
747
748 static int mmc_blk_part_switch_post(struct mmc_card *card,
749 unsigned int part_type)
750 {
751 int ret = 0;
752
753 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
754 mmc_retune_unpause(card->host);
755 if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
756 ret = mmc_cmdq_enable(card);
757 }
758
759 return ret;
760 }
761
762 static inline int mmc_blk_part_switch(struct mmc_card *card,
763 struct mmc_blk_data *md)
764 {
765 int ret = 0;
766 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
767
768 if (main_md->part_curr == md->part_type)
769 return 0;
770
771 if (mmc_card_mmc(card)) {
772 u8 part_config = card->ext_csd.part_config;
773
774 ret = mmc_blk_part_switch_pre(card, md->part_type);
775 if (ret)
776 return ret;
777
778 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
779 part_config |= md->part_type;
780
781 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
782 EXT_CSD_PART_CONFIG, part_config,
783 card->ext_csd.part_time);
784 if (ret) {
785 mmc_blk_part_switch_post(card, md->part_type);
786 return ret;
787 }
788
789 card->ext_csd.part_config = part_config;
790
791 ret = mmc_blk_part_switch_post(card, main_md->part_curr);
792 }
793
794 main_md->part_curr = md->part_type;
795 return ret;
796 }
797
798 static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
799 {
800 int err;
801 u32 result;
802 __be32 *blocks;
803
804 struct mmc_request mrq = {};
805 struct mmc_command cmd = {};
806 struct mmc_data data = {};
807
808 struct scatterlist sg;
809
810 cmd.opcode = MMC_APP_CMD;
811 cmd.arg = card->rca << 16;
812 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
813
814 err = mmc_wait_for_cmd(card->host, &cmd, 0);
815 if (err)
816 return err;
817 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
818 return -EIO;
819
820 memset(&cmd, 0, sizeof(struct mmc_command));
821
822 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
823 cmd.arg = 0;
824 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
825
826 data.blksz = 4;
827 data.blocks = 1;
828 data.flags = MMC_DATA_READ;
829 data.sg = &sg;
830 data.sg_len = 1;
831 mmc_set_data_timeout(&data, card);
832
833 mrq.cmd = &cmd;
834 mrq.data = &data;
835
836 blocks = kmalloc(4, GFP_KERNEL);
837 if (!blocks)
838 return -ENOMEM;
839
840 sg_init_one(&sg, blocks, 4);
841
842 mmc_wait_for_req(card->host, &mrq);
843
844 result = ntohl(*blocks);
845 kfree(blocks);
846
847 if (cmd.error || data.error)
848 return -EIO;
849
850 *written_blocks = result;
851
852 return 0;
853 }
854
855 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
856 {
857 struct mmc_command cmd = {};
858 int err;
859
860 cmd.opcode = MMC_SEND_STATUS;
861 if (!mmc_host_is_spi(card->host))
862 cmd.arg = card->rca << 16;
863 cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
864 err = mmc_wait_for_cmd(card->host, &cmd, retries);
865 if (err == 0)
866 *status = cmd.resp[0];
867 return err;
868 }
869
870 static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
871 bool hw_busy_detect, struct request *req, bool *gen_err)
872 {
873 unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
874 int err = 0;
875 u32 status;
876
877 do {
878 err = get_card_status(card, &status, 5);
879 if (err) {
880 pr_err("%s: error %d requesting status\n",
881 req->rq_disk->disk_name, err);
882 return err;
883 }
884
885 if (status & R1_ERROR) {
886 pr_err("%s: %s: error sending status cmd, status %#x\n",
887 req->rq_disk->disk_name, __func__, status);
888 *gen_err = true;
889 }
890
891 /* We may rely on the host hw to handle busy detection.*/
892 if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) &&
893 hw_busy_detect)
894 break;
895
896 /*
897 * Timeout if the device never becomes ready for data and never
898 * leaves the program state.
899 */
900 if (time_after(jiffies, timeout)) {
901 pr_err("%s: Card stuck in programming state! %s %s\n",
902 mmc_hostname(card->host),
903 req->rq_disk->disk_name, __func__);
904 return -ETIMEDOUT;
905 }
906
907 /*
908 * Some cards mishandle the status bits,
909 * so make sure to check both the busy
910 * indication and the card state.
911 */
912 } while (!(status & R1_READY_FOR_DATA) ||
913 (R1_CURRENT_STATE(status) == R1_STATE_PRG));
914
915 return err;
916 }
917
918 static int send_stop(struct mmc_card *card, unsigned int timeout_ms,
919 struct request *req, bool *gen_err, u32 *stop_status)
920 {
921 struct mmc_host *host = card->host;
922 struct mmc_command cmd = {};
923 int err;
924 bool use_r1b_resp = rq_data_dir(req) == WRITE;
925
926 /*
927 * Normally we use R1B responses for WRITE, but in cases where the host
928 * has specified a max_busy_timeout we need to validate it. A failure
929 * means we need to prevent the host from doing hw busy detection, which
930 * is done by converting to a R1 response instead.
931 */
932 if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout))
933 use_r1b_resp = false;
934
935 cmd.opcode = MMC_STOP_TRANSMISSION;
936 if (use_r1b_resp) {
937 cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
938 cmd.busy_timeout = timeout_ms;
939 } else {
940 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
941 }
942
943 err = mmc_wait_for_cmd(host, &cmd, 5);
944 if (err)
945 return err;
946
947 *stop_status = cmd.resp[0];
948
949 /* No need to check card status in case of READ. */
950 if (rq_data_dir(req) == READ)
951 return 0;
952
953 if (!mmc_host_is_spi(host) &&
954 (*stop_status & R1_ERROR)) {
955 pr_err("%s: %s: general error sending stop command, resp %#x\n",
956 req->rq_disk->disk_name, __func__, *stop_status);
957 *gen_err = true;
958 }
959
960 return card_busy_detect(card, timeout_ms, use_r1b_resp, req, gen_err);
961 }
962
963 #define ERR_NOMEDIUM 3
964 #define ERR_RETRY 2
965 #define ERR_ABORT 1
966 #define ERR_CONTINUE 0
967
968 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
969 bool status_valid, u32 status)
970 {
971 switch (error) {
972 case -EILSEQ:
973 /* response crc error, retry the r/w cmd */
974 pr_err("%s: %s sending %s command, card status %#x\n",
975 req->rq_disk->disk_name, "response CRC error",
976 name, status);
977 return ERR_RETRY;
978
979 case -ETIMEDOUT:
980 pr_err("%s: %s sending %s command, card status %#x\n",
981 req->rq_disk->disk_name, "timed out", name, status);
982
983 /* If the status cmd initially failed, retry the r/w cmd */
984 if (!status_valid) {
985 pr_err("%s: status not valid, retrying timeout\n",
986 req->rq_disk->disk_name);
987 return ERR_RETRY;
988 }
989
990 /*
991 * If it was a r/w cmd crc error, or illegal command
992 * (eg, issued in wrong state) then retry - we should
993 * have corrected the state problem above.
994 */
995 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND)) {
996 pr_err("%s: command error, retrying timeout\n",
997 req->rq_disk->disk_name);
998 return ERR_RETRY;
999 }
1000
1001 /* Otherwise abort the command */
1002 return ERR_ABORT;
1003
1004 default:
1005 /* We don't understand the error code the driver gave us */
1006 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
1007 req->rq_disk->disk_name, error, status);
1008 return ERR_ABORT;
1009 }
1010 }
1011
1012 /*
1013 * Initial r/w and stop cmd error recovery.
1014 * We don't know whether the card received the r/w cmd or not, so try to
1015 * restore things back to a sane state. Essentially, we do this as follows:
1016 * - Obtain card status. If the first attempt to obtain card status fails,
1017 * the status word will reflect the failed status cmd, not the failed
1018 * r/w cmd. If we fail to obtain card status, it suggests we can no
1019 * longer communicate with the card.
1020 * - Check the card state. If the card received the cmd but there was a
1021 * transient problem with the response, it might still be in a data transfer
1022 * mode. Try to send it a stop command. If this fails, we can't recover.
1023 * - If the r/w cmd failed due to a response CRC error, it was probably
1024 * transient, so retry the cmd.
1025 * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
1026 * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
1027 * illegal cmd, retry.
1028 * Otherwise we don't understand what happened, so abort.
1029 */
1030 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
1031 struct mmc_blk_request *brq, bool *ecc_err, bool *gen_err)
1032 {
1033 bool prev_cmd_status_valid = true;
1034 u32 status, stop_status = 0;
1035 int err, retry;
1036
1037 if (mmc_card_removed(card))
1038 return ERR_NOMEDIUM;
1039
1040 /*
1041 * Try to get card status which indicates both the card state
1042 * and why there was no response. If the first attempt fails,
1043 * we can't be sure the returned status is for the r/w command.
1044 */
1045 for (retry = 2; retry >= 0; retry--) {
1046 err = get_card_status(card, &status, 0);
1047 if (!err)
1048 break;
1049
1050 /* Re-tune if needed */
1051 mmc_retune_recheck(card->host);
1052
1053 prev_cmd_status_valid = false;
1054 pr_err("%s: error %d sending status command, %sing\n",
1055 req->rq_disk->disk_name, err, retry ? "retry" : "abort");
1056 }
1057
1058 /* We couldn't get a response from the card. Give up. */
1059 if (err) {
1060 /* Check if the card is removed */
1061 if (mmc_detect_card_removed(card->host))
1062 return ERR_NOMEDIUM;
1063 return ERR_ABORT;
1064 }
1065
1066 /* Flag ECC errors */
1067 if ((status & R1_CARD_ECC_FAILED) ||
1068 (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
1069 (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
1070 *ecc_err = true;
1071
1072 /* Flag General errors */
1073 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ)
1074 if ((status & R1_ERROR) ||
1075 (brq->stop.resp[0] & R1_ERROR)) {
1076 pr_err("%s: %s: general error sending stop or status command, stop cmd response %#x, card status %#x\n",
1077 req->rq_disk->disk_name, __func__,
1078 brq->stop.resp[0], status);
1079 *gen_err = true;
1080 }
1081
1082 /*
1083 * Check the current card state. If it is in some data transfer
1084 * mode, tell it to stop (and hopefully transition back to TRAN.)
1085 */
1086 if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
1087 R1_CURRENT_STATE(status) == R1_STATE_RCV) {
1088 err = send_stop(card,
1089 DIV_ROUND_UP(brq->data.timeout_ns, 1000000),
1090 req, gen_err, &stop_status);
1091 if (err) {
1092 pr_err("%s: error %d sending stop command\n",
1093 req->rq_disk->disk_name, err);
1094 /*
1095 * If the stop cmd also timed out, the card is probably
1096 * not present, so abort. Other errors are bad news too.
1097 */
1098 return ERR_ABORT;
1099 }
1100
1101 if (stop_status & R1_CARD_ECC_FAILED)
1102 *ecc_err = true;
1103 }
1104
1105 /* Check for set block count errors */
1106 if (brq->sbc.error)
1107 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
1108 prev_cmd_status_valid, status);
1109
1110 /* Check for r/w command errors */
1111 if (brq->cmd.error)
1112 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
1113 prev_cmd_status_valid, status);
1114
1115 /* Data errors */
1116 if (!brq->stop.error)
1117 return ERR_CONTINUE;
1118
1119 /* Now for stop errors. These aren't fatal to the transfer. */
1120 pr_info("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
1121 req->rq_disk->disk_name, brq->stop.error,
1122 brq->cmd.resp[0], status);
1123
1124 /*
1125 * Subsitute in our own stop status as this will give the error
1126 * state which happened during the execution of the r/w command.
1127 */
1128 if (stop_status) {
1129 brq->stop.resp[0] = stop_status;
1130 brq->stop.error = 0;
1131 }
1132 return ERR_CONTINUE;
1133 }
1134
1135 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1136 int type)
1137 {
1138 int err;
1139
1140 if (md->reset_done & type)
1141 return -EEXIST;
1142
1143 md->reset_done |= type;
1144 err = mmc_hw_reset(host);
1145 /* Ensure we switch back to the correct partition */
1146 if (err != -EOPNOTSUPP) {
1147 struct mmc_blk_data *main_md =
1148 dev_get_drvdata(&host->card->dev);
1149 int part_err;
1150
1151 main_md->part_curr = main_md->part_type;
1152 part_err = mmc_blk_part_switch(host->card, md);
1153 if (part_err) {
1154 /*
1155 * We have failed to get back into the correct
1156 * partition, so we need to abort the whole request.
1157 */
1158 return -ENODEV;
1159 }
1160 }
1161 return err;
1162 }
1163
1164 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1165 {
1166 md->reset_done &= ~type;
1167 }
1168
1169 int mmc_access_rpmb(struct mmc_queue *mq)
1170 {
1171 struct mmc_blk_data *md = mq->blkdata;
1172 /*
1173 * If this is a RPMB partition access, return ture
1174 */
1175 if (md && md->part_type == EXT_CSD_PART_CONFIG_ACC_RPMB)
1176 return true;
1177
1178 return false;
1179 }
1180
1181 static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1182 {
1183 struct mmc_blk_data *md = mq->blkdata;
1184 struct mmc_card *card = md->queue.card;
1185 unsigned int from, nr, arg;
1186 int err = 0, type = MMC_BLK_DISCARD;
1187 blk_status_t status = BLK_STS_OK;
1188
1189 if (!mmc_can_erase(card)) {
1190 status = BLK_STS_NOTSUPP;
1191 goto fail;
1192 }
1193
1194 from = blk_rq_pos(req);
1195 nr = blk_rq_sectors(req);
1196
1197 if (mmc_can_discard(card))
1198 arg = MMC_DISCARD_ARG;
1199 else if (mmc_can_trim(card))
1200 arg = MMC_TRIM_ARG;
1201 else
1202 arg = MMC_ERASE_ARG;
1203 do {
1204 err = 0;
1205 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1206 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1207 INAND_CMD38_ARG_EXT_CSD,
1208 arg == MMC_TRIM_ARG ?
1209 INAND_CMD38_ARG_TRIM :
1210 INAND_CMD38_ARG_ERASE,
1211 0);
1212 }
1213 if (!err)
1214 err = mmc_erase(card, from, nr, arg);
1215 } while (err == -EIO && !mmc_blk_reset(md, card->host, type));
1216 if (err)
1217 status = BLK_STS_IOERR;
1218 else
1219 mmc_blk_reset_success(md, type);
1220 fail:
1221 blk_end_request(req, status, blk_rq_bytes(req));
1222 }
1223
1224 static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1225 struct request *req)
1226 {
1227 struct mmc_blk_data *md = mq->blkdata;
1228 struct mmc_card *card = md->queue.card;
1229 unsigned int from, nr, arg;
1230 int err = 0, type = MMC_BLK_SECDISCARD;
1231 blk_status_t status = BLK_STS_OK;
1232
1233 if (!(mmc_can_secure_erase_trim(card))) {
1234 status = BLK_STS_NOTSUPP;
1235 goto out;
1236 }
1237
1238 from = blk_rq_pos(req);
1239 nr = blk_rq_sectors(req);
1240
1241 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1242 arg = MMC_SECURE_TRIM1_ARG;
1243 else
1244 arg = MMC_SECURE_ERASE_ARG;
1245
1246 retry:
1247 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1248 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1249 INAND_CMD38_ARG_EXT_CSD,
1250 arg == MMC_SECURE_TRIM1_ARG ?
1251 INAND_CMD38_ARG_SECTRIM1 :
1252 INAND_CMD38_ARG_SECERASE,
1253 0);
1254 if (err)
1255 goto out_retry;
1256 }
1257
1258 err = mmc_erase(card, from, nr, arg);
1259 if (err == -EIO)
1260 goto out_retry;
1261 if (err) {
1262 status = BLK_STS_IOERR;
1263 goto out;
1264 }
1265
1266 if (arg == MMC_SECURE_TRIM1_ARG) {
1267 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1268 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1269 INAND_CMD38_ARG_EXT_CSD,
1270 INAND_CMD38_ARG_SECTRIM2,
1271 0);
1272 if (err)
1273 goto out_retry;
1274 }
1275
1276 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1277 if (err == -EIO)
1278 goto out_retry;
1279 if (err) {
1280 status = BLK_STS_IOERR;
1281 goto out;
1282 }
1283 }
1284
1285 out_retry:
1286 if (err && !mmc_blk_reset(md, card->host, type))
1287 goto retry;
1288 if (!err)
1289 mmc_blk_reset_success(md, type);
1290 out:
1291 blk_end_request(req, status, blk_rq_bytes(req));
1292 }
1293
1294 static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1295 {
1296 struct mmc_blk_data *md = mq->blkdata;
1297 struct mmc_card *card = md->queue.card;
1298 int ret = 0;
1299
1300 ret = mmc_flush_cache(card);
1301 blk_end_request_all(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1302 }
1303
1304 /*
1305 * Reformat current write as a reliable write, supporting
1306 * both legacy and the enhanced reliable write MMC cards.
1307 * In each transfer we'll handle only as much as a single
1308 * reliable write can handle, thus finish the request in
1309 * partial completions.
1310 */
1311 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1312 struct mmc_card *card,
1313 struct request *req)
1314 {
1315 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1316 /* Legacy mode imposes restrictions on transfers. */
1317 if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors))
1318 brq->data.blocks = 1;
1319
1320 if (brq->data.blocks > card->ext_csd.rel_sectors)
1321 brq->data.blocks = card->ext_csd.rel_sectors;
1322 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1323 brq->data.blocks = 1;
1324 }
1325 }
1326
1327 #define CMD_ERRORS \
1328 (R1_OUT_OF_RANGE | /* Command argument out of range */ \
1329 R1_ADDRESS_ERROR | /* Misaligned address */ \
1330 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
1331 R1_WP_VIOLATION | /* Tried to write to protected block */ \
1332 R1_CC_ERROR | /* Card controller error */ \
1333 R1_ERROR) /* General/unknown error */
1334
1335 static enum mmc_blk_status mmc_blk_err_check(struct mmc_card *card,
1336 struct mmc_async_req *areq)
1337 {
1338 struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1339 areq);
1340 struct mmc_blk_request *brq = &mq_mrq->brq;
1341 struct request *req = mq_mrq->req;
1342 int need_retune = card->host->need_retune;
1343 bool ecc_err = false;
1344 bool gen_err = false;
1345
1346 /*
1347 * sbc.error indicates a problem with the set block count
1348 * command. No data will have been transferred.
1349 *
1350 * cmd.error indicates a problem with the r/w command. No
1351 * data will have been transferred.
1352 *
1353 * stop.error indicates a problem with the stop command. Data
1354 * may have been transferred, or may still be transferring.
1355 */
1356 if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1357 brq->data.error) {
1358 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err, &gen_err)) {
1359 case ERR_RETRY:
1360 return MMC_BLK_RETRY;
1361 case ERR_ABORT:
1362 return MMC_BLK_ABORT;
1363 case ERR_NOMEDIUM:
1364 return MMC_BLK_NOMEDIUM;
1365 case ERR_CONTINUE:
1366 break;
1367 }
1368 }
1369
1370 /*
1371 * Check for errors relating to the execution of the
1372 * initial command - such as address errors. No data
1373 * has been transferred.
1374 */
1375 if (brq->cmd.resp[0] & CMD_ERRORS) {
1376 pr_err("%s: r/w command failed, status = %#x\n",
1377 req->rq_disk->disk_name, brq->cmd.resp[0]);
1378 return MMC_BLK_ABORT;
1379 }
1380
1381 /*
1382 * Everything else is either success, or a data error of some
1383 * kind. If it was a write, we may have transitioned to
1384 * program mode, which we have to wait for it to complete.
1385 */
1386 if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1387 int err;
1388
1389 /* Check stop command response */
1390 if (brq->stop.resp[0] & R1_ERROR) {
1391 pr_err("%s: %s: general error sending stop command, stop cmd response %#x\n",
1392 req->rq_disk->disk_name, __func__,
1393 brq->stop.resp[0]);
1394 gen_err = true;
1395 }
1396
1397 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, false, req,
1398 &gen_err);
1399 if (err)
1400 return MMC_BLK_CMD_ERR;
1401 }
1402
1403 /* if general error occurs, retry the write operation. */
1404 if (gen_err) {
1405 pr_warn("%s: retrying write for general error\n",
1406 req->rq_disk->disk_name);
1407 return MMC_BLK_RETRY;
1408 }
1409
1410 if (brq->data.error) {
1411 if (need_retune && !brq->retune_retry_done) {
1412 pr_debug("%s: retrying because a re-tune was needed\n",
1413 req->rq_disk->disk_name);
1414 brq->retune_retry_done = 1;
1415 return MMC_BLK_RETRY;
1416 }
1417 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1418 req->rq_disk->disk_name, brq->data.error,
1419 (unsigned)blk_rq_pos(req),
1420 (unsigned)blk_rq_sectors(req),
1421 brq->cmd.resp[0], brq->stop.resp[0]);
1422
1423 if (rq_data_dir(req) == READ) {
1424 if (ecc_err)
1425 return MMC_BLK_ECC_ERR;
1426 return MMC_BLK_DATA_ERR;
1427 } else {
1428 return MMC_BLK_CMD_ERR;
1429 }
1430 }
1431
1432 if (!brq->data.bytes_xfered)
1433 return MMC_BLK_RETRY;
1434
1435 if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1436 return MMC_BLK_PARTIAL;
1437
1438 return MMC_BLK_SUCCESS;
1439 }
1440
1441 static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
1442 int disable_multi, bool *do_rel_wr,
1443 bool *do_data_tag)
1444 {
1445 struct mmc_blk_data *md = mq->blkdata;
1446 struct mmc_card *card = md->queue.card;
1447 struct mmc_blk_request *brq = &mqrq->brq;
1448 struct request *req = mqrq->req;
1449
1450 /*
1451 * Reliable writes are used to implement Forced Unit Access and
1452 * are supported only on MMCs.
1453 */
1454 *do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1455 rq_data_dir(req) == WRITE &&
1456 (md->flags & MMC_BLK_REL_WR);
1457
1458 memset(brq, 0, sizeof(struct mmc_blk_request));
1459
1460 brq->mrq.data = &brq->data;
1461
1462 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1463 brq->stop.arg = 0;
1464
1465 if (rq_data_dir(req) == READ) {
1466 brq->data.flags = MMC_DATA_READ;
1467 brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1468 } else {
1469 brq->data.flags = MMC_DATA_WRITE;
1470 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1471 }
1472
1473 brq->data.blksz = 512;
1474 brq->data.blocks = blk_rq_sectors(req);
1475
1476 /*
1477 * The block layer doesn't support all sector count
1478 * restrictions, so we need to be prepared for too big
1479 * requests.
1480 */
1481 if (brq->data.blocks > card->host->max_blk_count)
1482 brq->data.blocks = card->host->max_blk_count;
1483
1484 if (brq->data.blocks > 1) {
1485 /*
1486 * After a read error, we redo the request one sector
1487 * at a time in order to accurately determine which
1488 * sectors can be read successfully.
1489 */
1490 if (disable_multi)
1491 brq->data.blocks = 1;
1492
1493 /*
1494 * Some controllers have HW issues while operating
1495 * in multiple I/O mode
1496 */
1497 if (card->host->ops->multi_io_quirk)
1498 brq->data.blocks = card->host->ops->multi_io_quirk(card,
1499 (rq_data_dir(req) == READ) ?
1500 MMC_DATA_READ : MMC_DATA_WRITE,
1501 brq->data.blocks);
1502 }
1503
1504 if (*do_rel_wr)
1505 mmc_apply_rel_rw(brq, card, req);
1506
1507 /*
1508 * Data tag is used only during writing meta data to speed
1509 * up write and any subsequent read of this meta data
1510 */
1511 *do_data_tag = card->ext_csd.data_tag_unit_size &&
1512 (req->cmd_flags & REQ_META) &&
1513 (rq_data_dir(req) == WRITE) &&
1514 ((brq->data.blocks * brq->data.blksz) >=
1515 card->ext_csd.data_tag_unit_size);
1516
1517 mmc_set_data_timeout(&brq->data, card);
1518
1519 brq->data.sg = mqrq->sg;
1520 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1521
1522 /*
1523 * Adjust the sg list so it is the same size as the
1524 * request.
1525 */
1526 if (brq->data.blocks != blk_rq_sectors(req)) {
1527 int i, data_size = brq->data.blocks << 9;
1528 struct scatterlist *sg;
1529
1530 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1531 data_size -= sg->length;
1532 if (data_size <= 0) {
1533 sg->length += data_size;
1534 i++;
1535 break;
1536 }
1537 }
1538 brq->data.sg_len = i;
1539 }
1540
1541 mqrq->areq.mrq = &brq->mrq;
1542
1543 mmc_queue_bounce_pre(mqrq);
1544 }
1545
1546 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1547 struct mmc_card *card,
1548 int disable_multi,
1549 struct mmc_queue *mq)
1550 {
1551 u32 readcmd, writecmd;
1552 struct mmc_blk_request *brq = &mqrq->brq;
1553 struct request *req = mqrq->req;
1554 struct mmc_blk_data *md = mq->blkdata;
1555 bool do_rel_wr, do_data_tag;
1556
1557 mmc_blk_data_prep(mq, mqrq, disable_multi, &do_rel_wr, &do_data_tag);
1558
1559 brq->mrq.cmd = &brq->cmd;
1560
1561 brq->cmd.arg = blk_rq_pos(req);
1562 if (!mmc_card_blockaddr(card))
1563 brq->cmd.arg <<= 9;
1564 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1565
1566 if (brq->data.blocks > 1 || do_rel_wr) {
1567 /* SPI multiblock writes terminate using a special
1568 * token, not a STOP_TRANSMISSION request.
1569 */
1570 if (!mmc_host_is_spi(card->host) ||
1571 rq_data_dir(req) == READ)
1572 brq->mrq.stop = &brq->stop;
1573 readcmd = MMC_READ_MULTIPLE_BLOCK;
1574 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1575 } else {
1576 brq->mrq.stop = NULL;
1577 readcmd = MMC_READ_SINGLE_BLOCK;
1578 writecmd = MMC_WRITE_BLOCK;
1579 }
1580 brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd;
1581
1582 /*
1583 * Pre-defined multi-block transfers are preferable to
1584 * open ended-ones (and necessary for reliable writes).
1585 * However, it is not sufficient to just send CMD23,
1586 * and avoid the final CMD12, as on an error condition
1587 * CMD12 (stop) needs to be sent anyway. This, coupled
1588 * with Auto-CMD23 enhancements provided by some
1589 * hosts, means that the complexity of dealing
1590 * with this is best left to the host. If CMD23 is
1591 * supported by card and host, we'll fill sbc in and let
1592 * the host deal with handling it correctly. This means
1593 * that for hosts that don't expose MMC_CAP_CMD23, no
1594 * change of behavior will be observed.
1595 *
1596 * N.B: Some MMC cards experience perf degradation.
1597 * We'll avoid using CMD23-bounded multiblock writes for
1598 * these, while retaining features like reliable writes.
1599 */
1600 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1601 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1602 do_data_tag)) {
1603 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1604 brq->sbc.arg = brq->data.blocks |
1605 (do_rel_wr ? (1 << 31) : 0) |
1606 (do_data_tag ? (1 << 29) : 0);
1607 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1608 brq->mrq.sbc = &brq->sbc;
1609 }
1610
1611 mqrq->areq.err_check = mmc_blk_err_check;
1612 }
1613
1614 static bool mmc_blk_rw_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1615 struct mmc_blk_request *brq, struct request *req,
1616 bool old_req_pending)
1617 {
1618 bool req_pending;
1619
1620 /*
1621 * If this is an SD card and we're writing, we can first
1622 * mark the known good sectors as ok.
1623 *
1624 * If the card is not SD, we can still ok written sectors
1625 * as reported by the controller (which might be less than
1626 * the real number of written sectors, but never more).
1627 */
1628 if (mmc_card_sd(card)) {
1629 u32 blocks;
1630 int err;
1631
1632 err = mmc_sd_num_wr_blocks(card, &blocks);
1633 if (err)
1634 req_pending = old_req_pending;
1635 else
1636 req_pending = blk_end_request(req, 0, blocks << 9);
1637 } else {
1638 req_pending = blk_end_request(req, 0, brq->data.bytes_xfered);
1639 }
1640 return req_pending;
1641 }
1642
1643 static void mmc_blk_rw_cmd_abort(struct mmc_queue *mq, struct mmc_card *card,
1644 struct request *req,
1645 struct mmc_queue_req *mqrq)
1646 {
1647 if (mmc_card_removed(card))
1648 req->rq_flags |= RQF_QUIET;
1649 while (blk_end_request(req, BLK_STS_IOERR, blk_rq_cur_bytes(req)));
1650 mmc_queue_req_free(mq, mqrq);
1651 }
1652
1653 /**
1654 * mmc_blk_rw_try_restart() - tries to restart the current async request
1655 * @mq: the queue with the card and host to restart
1656 * @req: a new request that want to be started after the current one
1657 */
1658 static void mmc_blk_rw_try_restart(struct mmc_queue *mq, struct request *req,
1659 struct mmc_queue_req *mqrq)
1660 {
1661 if (!req)
1662 return;
1663
1664 /*
1665 * If the card was removed, just cancel everything and return.
1666 */
1667 if (mmc_card_removed(mq->card)) {
1668 req->rq_flags |= RQF_QUIET;
1669 blk_end_request_all(req, BLK_STS_IOERR);
1670 mmc_queue_req_free(mq, mqrq);
1671 return;
1672 }
1673 /* Else proceed and try to restart the current async request */
1674 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
1675 mmc_start_areq(mq->card->host, &mqrq->areq, NULL);
1676 }
1677
1678 static void mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *new_req)
1679 {
1680 struct mmc_blk_data *md = mq->blkdata;
1681 struct mmc_card *card = md->queue.card;
1682 struct mmc_blk_request *brq;
1683 int disable_multi = 0, retry = 0, type, retune_retry_done = 0;
1684 enum mmc_blk_status status;
1685 struct mmc_queue_req *mqrq_cur = NULL;
1686 struct mmc_queue_req *mq_rq;
1687 struct request *old_req;
1688 struct mmc_async_req *new_areq;
1689 struct mmc_async_req *old_areq;
1690 bool req_pending = true;
1691
1692 if (new_req) {
1693 mqrq_cur = mmc_queue_req_find(mq, new_req);
1694 if (!mqrq_cur) {
1695 WARN_ON(1);
1696 mmc_blk_requeue(mq->queue, new_req);
1697 new_req = NULL;
1698 }
1699 }
1700
1701 if (!mq->qcnt)
1702 return;
1703
1704 do {
1705 if (new_req) {
1706 /*
1707 * When 4KB native sector is enabled, only 8 blocks
1708 * multiple read or write is allowed
1709 */
1710 if (mmc_large_sector(card) &&
1711 !IS_ALIGNED(blk_rq_sectors(new_req), 8)) {
1712 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1713 new_req->rq_disk->disk_name);
1714 mmc_blk_rw_cmd_abort(mq, card, new_req, mqrq_cur);
1715 return;
1716 }
1717
1718 mmc_blk_rw_rq_prep(mqrq_cur, card, 0, mq);
1719 new_areq = &mqrq_cur->areq;
1720 } else
1721 new_areq = NULL;
1722
1723 old_areq = mmc_start_areq(card->host, new_areq, &status);
1724 if (!old_areq) {
1725 /*
1726 * We have just put the first request into the pipeline
1727 * and there is nothing more to do until it is
1728 * complete.
1729 */
1730 return;
1731 }
1732
1733 /*
1734 * An asynchronous request has been completed and we proceed
1735 * to handle the result of it.
1736 */
1737 mq_rq = container_of(old_areq, struct mmc_queue_req, areq);
1738 brq = &mq_rq->brq;
1739 old_req = mq_rq->req;
1740 type = rq_data_dir(old_req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1741 mmc_queue_bounce_post(mq_rq);
1742
1743 switch (status) {
1744 case MMC_BLK_SUCCESS:
1745 case MMC_BLK_PARTIAL:
1746 /*
1747 * A block was successfully transferred.
1748 */
1749 mmc_blk_reset_success(md, type);
1750
1751 req_pending = blk_end_request(old_req, BLK_STS_OK,
1752 brq->data.bytes_xfered);
1753 /*
1754 * If the blk_end_request function returns non-zero even
1755 * though all data has been transferred and no errors
1756 * were returned by the host controller, it's a bug.
1757 */
1758 if (status == MMC_BLK_SUCCESS && req_pending) {
1759 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1760 __func__, blk_rq_bytes(old_req),
1761 brq->data.bytes_xfered);
1762 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1763 return;
1764 }
1765 break;
1766 case MMC_BLK_CMD_ERR:
1767 req_pending = mmc_blk_rw_cmd_err(md, card, brq, old_req, req_pending);
1768 if (mmc_blk_reset(md, card->host, type)) {
1769 if (req_pending)
1770 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1771 else
1772 mmc_queue_req_free(mq, mq_rq);
1773 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1774 return;
1775 }
1776 if (!req_pending) {
1777 mmc_queue_req_free(mq, mq_rq);
1778 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1779 return;
1780 }
1781 break;
1782 case MMC_BLK_RETRY:
1783 retune_retry_done = brq->retune_retry_done;
1784 if (retry++ < 5)
1785 break;
1786 /* Fall through */
1787 case MMC_BLK_ABORT:
1788 if (!mmc_blk_reset(md, card->host, type))
1789 break;
1790 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1791 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1792 return;
1793 case MMC_BLK_DATA_ERR: {
1794 int err;
1795
1796 err = mmc_blk_reset(md, card->host, type);
1797 if (!err)
1798 break;
1799 if (err == -ENODEV) {
1800 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1801 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1802 return;
1803 }
1804 /* Fall through */
1805 }
1806 case MMC_BLK_ECC_ERR:
1807 if (brq->data.blocks > 1) {
1808 /* Redo read one sector at a time */
1809 pr_warn("%s: retrying using single block read\n",
1810 old_req->rq_disk->disk_name);
1811 disable_multi = 1;
1812 break;
1813 }
1814 /*
1815 * After an error, we redo I/O one sector at a
1816 * time, so we only reach here after trying to
1817 * read a single sector.
1818 */
1819 req_pending = blk_end_request(old_req, BLK_STS_IOERR,
1820 brq->data.blksz);
1821 if (!req_pending) {
1822 mmc_queue_req_free(mq, mq_rq);
1823 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1824 return;
1825 }
1826 break;
1827 case MMC_BLK_NOMEDIUM:
1828 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1829 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1830 return;
1831 default:
1832 pr_err("%s: Unhandled return value (%d)",
1833 old_req->rq_disk->disk_name, status);
1834 mmc_blk_rw_cmd_abort(mq, card, old_req, mq_rq);
1835 mmc_blk_rw_try_restart(mq, new_req, mqrq_cur);
1836 return;
1837 }
1838
1839 if (req_pending) {
1840 /*
1841 * In case of a incomplete request
1842 * prepare it again and resend.
1843 */
1844 mmc_blk_rw_rq_prep(mq_rq, card,
1845 disable_multi, mq);
1846 mmc_start_areq(card->host,
1847 &mq_rq->areq, NULL);
1848 mq_rq->brq.retune_retry_done = retune_retry_done;
1849 }
1850 } while (req_pending);
1851
1852 mmc_queue_req_free(mq, mq_rq);
1853 }
1854
1855 void mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1856 {
1857 int ret;
1858 struct mmc_blk_data *md = mq->blkdata;
1859 struct mmc_card *card = md->queue.card;
1860
1861 if (req && !mq->qcnt)
1862 /* claim host only for the first request */
1863 mmc_get_card(card);
1864
1865 ret = mmc_blk_part_switch(card, md);
1866 if (ret) {
1867 if (req) {
1868 blk_end_request_all(req, BLK_STS_IOERR);
1869 }
1870 goto out;
1871 }
1872
1873 if (req && req_op(req) == REQ_OP_DISCARD) {
1874 /* complete ongoing async transfer before issuing discard */
1875 if (mq->qcnt)
1876 mmc_blk_issue_rw_rq(mq, NULL);
1877 mmc_blk_issue_discard_rq(mq, req);
1878 } else if (req && req_op(req) == REQ_OP_SECURE_ERASE) {
1879 /* complete ongoing async transfer before issuing secure erase*/
1880 if (mq->qcnt)
1881 mmc_blk_issue_rw_rq(mq, NULL);
1882 mmc_blk_issue_secdiscard_rq(mq, req);
1883 } else if (req && req_op(req) == REQ_OP_FLUSH) {
1884 /* complete ongoing async transfer before issuing flush */
1885 if (mq->qcnt)
1886 mmc_blk_issue_rw_rq(mq, NULL);
1887 mmc_blk_issue_flush(mq, req);
1888 } else {
1889 mmc_blk_issue_rw_rq(mq, req);
1890 card->host->context_info.is_waiting_last_req = false;
1891 }
1892
1893 out:
1894 if (!mq->qcnt)
1895 mmc_put_card(card);
1896 }
1897
1898 static inline int mmc_blk_readonly(struct mmc_card *card)
1899 {
1900 return mmc_card_readonly(card) ||
1901 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
1902 }
1903
1904 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
1905 struct device *parent,
1906 sector_t size,
1907 bool default_ro,
1908 const char *subname,
1909 int area_type)
1910 {
1911 struct mmc_blk_data *md;
1912 int devidx, ret;
1913
1914 devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL);
1915 if (devidx < 0)
1916 return ERR_PTR(devidx);
1917
1918 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
1919 if (!md) {
1920 ret = -ENOMEM;
1921 goto out;
1922 }
1923
1924 md->area_type = area_type;
1925
1926 /*
1927 * Set the read-only status based on the supported commands
1928 * and the write protect switch.
1929 */
1930 md->read_only = mmc_blk_readonly(card);
1931
1932 md->disk = alloc_disk(perdev_minors);
1933 if (md->disk == NULL) {
1934 ret = -ENOMEM;
1935 goto err_kfree;
1936 }
1937
1938 spin_lock_init(&md->lock);
1939 INIT_LIST_HEAD(&md->part);
1940 md->usage = 1;
1941
1942 ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
1943 if (ret)
1944 goto err_putdisk;
1945
1946 md->queue.blkdata = md;
1947
1948 md->disk->major = MMC_BLOCK_MAJOR;
1949 md->disk->first_minor = devidx * perdev_minors;
1950 md->disk->fops = &mmc_bdops;
1951 md->disk->private_data = md;
1952 md->disk->queue = md->queue.queue;
1953 md->parent = parent;
1954 set_disk_ro(md->disk, md->read_only || default_ro);
1955 md->disk->flags = GENHD_FL_EXT_DEVT;
1956 if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
1957 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
1958
1959 /*
1960 * As discussed on lkml, GENHD_FL_REMOVABLE should:
1961 *
1962 * - be set for removable media with permanent block devices
1963 * - be unset for removable block devices with permanent media
1964 *
1965 * Since MMC block devices clearly fall under the second
1966 * case, we do not set GENHD_FL_REMOVABLE. Userspace
1967 * should use the block device creation/destruction hotplug
1968 * messages to tell when the card is present.
1969 */
1970
1971 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
1972 "mmcblk%u%s", card->host->index, subname ? subname : "");
1973
1974 if (mmc_card_mmc(card))
1975 blk_queue_logical_block_size(md->queue.queue,
1976 card->ext_csd.data_sector_size);
1977 else
1978 blk_queue_logical_block_size(md->queue.queue, 512);
1979
1980 set_capacity(md->disk, size);
1981
1982 if (mmc_host_cmd23(card->host)) {
1983 if ((mmc_card_mmc(card) &&
1984 card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
1985 (mmc_card_sd(card) &&
1986 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
1987 md->flags |= MMC_BLK_CMD23;
1988 }
1989
1990 if (mmc_card_mmc(card) &&
1991 md->flags & MMC_BLK_CMD23 &&
1992 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
1993 card->ext_csd.rel_sectors)) {
1994 md->flags |= MMC_BLK_REL_WR;
1995 blk_queue_write_cache(md->queue.queue, true, true);
1996 }
1997
1998 return md;
1999
2000 err_putdisk:
2001 put_disk(md->disk);
2002 err_kfree:
2003 kfree(md);
2004 out:
2005 ida_simple_remove(&mmc_blk_ida, devidx);
2006 return ERR_PTR(ret);
2007 }
2008
2009 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2010 {
2011 sector_t size;
2012
2013 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2014 /*
2015 * The EXT_CSD sector count is in number or 512 byte
2016 * sectors.
2017 */
2018 size = card->ext_csd.sectors;
2019 } else {
2020 /*
2021 * The CSD capacity field is in units of read_blkbits.
2022 * set_capacity takes units of 512 bytes.
2023 */
2024 size = (typeof(sector_t))card->csd.capacity
2025 << (card->csd.read_blkbits - 9);
2026 }
2027
2028 return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2029 MMC_BLK_DATA_AREA_MAIN);
2030 }
2031
2032 static int mmc_blk_alloc_part(struct mmc_card *card,
2033 struct mmc_blk_data *md,
2034 unsigned int part_type,
2035 sector_t size,
2036 bool default_ro,
2037 const char *subname,
2038 int area_type)
2039 {
2040 char cap_str[10];
2041 struct mmc_blk_data *part_md;
2042
2043 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2044 subname, area_type);
2045 if (IS_ERR(part_md))
2046 return PTR_ERR(part_md);
2047 part_md->part_type = part_type;
2048 list_add(&part_md->part, &md->part);
2049
2050 string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2051 cap_str, sizeof(cap_str));
2052 pr_info("%s: %s %s partition %u %s\n",
2053 part_md->disk->disk_name, mmc_card_id(card),
2054 mmc_card_name(card), part_md->part_type, cap_str);
2055 return 0;
2056 }
2057
2058 /* MMC Physical partitions consist of two boot partitions and
2059 * up to four general purpose partitions.
2060 * For each partition enabled in EXT_CSD a block device will be allocatedi
2061 * to provide access to the partition.
2062 */
2063
2064 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2065 {
2066 int idx, ret = 0;
2067
2068 if (!mmc_card_mmc(card))
2069 return 0;
2070
2071 for (idx = 0; idx < card->nr_parts; idx++) {
2072 if (card->part[idx].size) {
2073 ret = mmc_blk_alloc_part(card, md,
2074 card->part[idx].part_cfg,
2075 card->part[idx].size >> 9,
2076 card->part[idx].force_ro,
2077 card->part[idx].name,
2078 card->part[idx].area_type);
2079 if (ret)
2080 return ret;
2081 }
2082 }
2083
2084 return ret;
2085 }
2086
2087 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2088 {
2089 struct mmc_card *card;
2090
2091 if (md) {
2092 /*
2093 * Flush remaining requests and free queues. It
2094 * is freeing the queue that stops new requests
2095 * from being accepted.
2096 */
2097 card = md->queue.card;
2098 mmc_cleanup_queue(&md->queue);
2099 if (md->disk->flags & GENHD_FL_UP) {
2100 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2101 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2102 card->ext_csd.boot_ro_lockable)
2103 device_remove_file(disk_to_dev(md->disk),
2104 &md->power_ro_lock);
2105
2106 del_gendisk(md->disk);
2107 }
2108 mmc_blk_put(md);
2109 }
2110 }
2111
2112 static void mmc_blk_remove_parts(struct mmc_card *card,
2113 struct mmc_blk_data *md)
2114 {
2115 struct list_head *pos, *q;
2116 struct mmc_blk_data *part_md;
2117
2118 list_for_each_safe(pos, q, &md->part) {
2119 part_md = list_entry(pos, struct mmc_blk_data, part);
2120 list_del(pos);
2121 mmc_blk_remove_req(part_md);
2122 }
2123 }
2124
2125 static int mmc_add_disk(struct mmc_blk_data *md)
2126 {
2127 int ret;
2128 struct mmc_card *card = md->queue.card;
2129
2130 device_add_disk(md->parent, md->disk);
2131 md->force_ro.show = force_ro_show;
2132 md->force_ro.store = force_ro_store;
2133 sysfs_attr_init(&md->force_ro.attr);
2134 md->force_ro.attr.name = "force_ro";
2135 md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2136 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2137 if (ret)
2138 goto force_ro_fail;
2139
2140 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2141 card->ext_csd.boot_ro_lockable) {
2142 umode_t mode;
2143
2144 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2145 mode = S_IRUGO;
2146 else
2147 mode = S_IRUGO | S_IWUSR;
2148
2149 md->power_ro_lock.show = power_ro_lock_show;
2150 md->power_ro_lock.store = power_ro_lock_store;
2151 sysfs_attr_init(&md->power_ro_lock.attr);
2152 md->power_ro_lock.attr.mode = mode;
2153 md->power_ro_lock.attr.name =
2154 "ro_lock_until_next_power_on";
2155 ret = device_create_file(disk_to_dev(md->disk),
2156 &md->power_ro_lock);
2157 if (ret)
2158 goto power_ro_lock_fail;
2159 }
2160 return ret;
2161
2162 power_ro_lock_fail:
2163 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2164 force_ro_fail:
2165 del_gendisk(md->disk);
2166
2167 return ret;
2168 }
2169
2170 static int mmc_blk_probe(struct mmc_card *card)
2171 {
2172 struct mmc_blk_data *md, *part_md;
2173 char cap_str[10];
2174 int ret;
2175
2176 /*
2177 * Check that the card supports the command class(es) we need.
2178 */
2179 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2180 return -ENODEV;
2181
2182 mmc_fixup_device(card, mmc_blk_fixups);
2183
2184 ret = mmc_queue_alloc_shared_queue(card);
2185 if (ret)
2186 return ret;
2187
2188 md = mmc_blk_alloc(card);
2189 if (IS_ERR(md)) {
2190 mmc_queue_free_shared_queue(card);
2191 return PTR_ERR(md);
2192 }
2193
2194 string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2195 cap_str, sizeof(cap_str));
2196 pr_info("%s: %s %s %s %s\n",
2197 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2198 cap_str, md->read_only ? "(ro)" : "");
2199
2200 if (mmc_blk_alloc_parts(card, md))
2201 goto out;
2202
2203 dev_set_drvdata(&card->dev, md);
2204
2205 if (mmc_add_disk(md))
2206 goto out;
2207
2208 list_for_each_entry(part_md, &md->part, part) {
2209 if (mmc_add_disk(part_md))
2210 goto out;
2211 }
2212
2213 pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2214 pm_runtime_use_autosuspend(&card->dev);
2215
2216 /*
2217 * Don't enable runtime PM for SD-combo cards here. Leave that
2218 * decision to be taken during the SDIO init sequence instead.
2219 */
2220 if (card->type != MMC_TYPE_SD_COMBO) {
2221 pm_runtime_set_active(&card->dev);
2222 pm_runtime_enable(&card->dev);
2223 }
2224
2225 return 0;
2226
2227 out:
2228 mmc_blk_remove_parts(card, md);
2229 mmc_blk_remove_req(md);
2230 mmc_queue_free_shared_queue(card);
2231 return 0;
2232 }
2233
2234 static void mmc_blk_remove(struct mmc_card *card)
2235 {
2236 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2237
2238 mmc_blk_remove_parts(card, md);
2239 pm_runtime_get_sync(&card->dev);
2240 mmc_claim_host(card->host);
2241 mmc_blk_part_switch(card, md);
2242 mmc_release_host(card->host);
2243 if (card->type != MMC_TYPE_SD_COMBO)
2244 pm_runtime_disable(&card->dev);
2245 pm_runtime_put_noidle(&card->dev);
2246 mmc_blk_remove_req(md);
2247 dev_set_drvdata(&card->dev, NULL);
2248 mmc_queue_free_shared_queue(card);
2249 }
2250
2251 static int _mmc_blk_suspend(struct mmc_card *card)
2252 {
2253 struct mmc_blk_data *part_md;
2254 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2255
2256 if (md) {
2257 mmc_queue_suspend(&md->queue);
2258 list_for_each_entry(part_md, &md->part, part) {
2259 mmc_queue_suspend(&part_md->queue);
2260 }
2261 }
2262 return 0;
2263 }
2264
2265 static void mmc_blk_shutdown(struct mmc_card *card)
2266 {
2267 _mmc_blk_suspend(card);
2268 }
2269
2270 #ifdef CONFIG_PM_SLEEP
2271 static int mmc_blk_suspend(struct device *dev)
2272 {
2273 struct mmc_card *card = mmc_dev_to_card(dev);
2274
2275 return _mmc_blk_suspend(card);
2276 }
2277
2278 static int mmc_blk_resume(struct device *dev)
2279 {
2280 struct mmc_blk_data *part_md;
2281 struct mmc_blk_data *md = dev_get_drvdata(dev);
2282
2283 if (md) {
2284 /*
2285 * Resume involves the card going into idle state,
2286 * so current partition is always the main one.
2287 */
2288 md->part_curr = md->part_type;
2289 mmc_queue_resume(&md->queue);
2290 list_for_each_entry(part_md, &md->part, part) {
2291 mmc_queue_resume(&part_md->queue);
2292 }
2293 }
2294 return 0;
2295 }
2296 #endif
2297
2298 static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
2299
2300 static struct mmc_driver mmc_driver = {
2301 .drv = {
2302 .name = "mmcblk",
2303 .pm = &mmc_blk_pm_ops,
2304 },
2305 .probe = mmc_blk_probe,
2306 .remove = mmc_blk_remove,
2307 .shutdown = mmc_blk_shutdown,
2308 };
2309
2310 static int __init mmc_blk_init(void)
2311 {
2312 int res;
2313
2314 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2315 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2316
2317 max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
2318
2319 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2320 if (res)
2321 goto out;
2322
2323 res = mmc_register_driver(&mmc_driver);
2324 if (res)
2325 goto out2;
2326
2327 return 0;
2328 out2:
2329 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2330 out:
2331 return res;
2332 }
2333
2334 static void __exit mmc_blk_exit(void)
2335 {
2336 mmc_unregister_driver(&mmc_driver);
2337 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2338 }
2339
2340 module_init(mmc_blk_init);
2341 module_exit(mmc_blk_exit);
2342
2343 MODULE_LICENSE("GPL");
2344 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2345
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