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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Block driver for media (i.e., flash cards)
4 *
5 * Copyright 2002 Hewlett-Packard Company
6 * Copyright 2005-2008 Pierre Ossman
7 *
8 * Use consistent with the GNU GPL is permitted,
9 * provided that this copyright notice is
10 * preserved in its entirety in all copies and derived works.
11 *
12 * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
13 * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
14 * FITNESS FOR ANY PARTICULAR PURPOSE.
15 *
16 * Many thanks to Alessandro Rubini and Jonathan Corbet!
17 *
18 * Author: Andrew Christian
19 * 28 May 2002
20 */
21#include <linux/moduleparam.h>
22#include <linux/module.h>
23#include <linux/init.h>
24
25#include <linux/kernel.h>
26#include <linux/fs.h>
27#include <linux/slab.h>
28#include <linux/errno.h>
29#include <linux/hdreg.h>
30#include <linux/kdev_t.h>
31#include <linux/kref.h>
32#include <linux/blkdev.h>
33#include <linux/cdev.h>
34#include <linux/mutex.h>
35#include <linux/scatterlist.h>
36#include <linux/string_helpers.h>
37#include <linux/delay.h>
38#include <linux/capability.h>
39#include <linux/compat.h>
40#include <linux/pm_runtime.h>
41#include <linux/idr.h>
42#include <linux/debugfs.h>
43
44#include <linux/mmc/ioctl.h>
45#include <linux/mmc/card.h>
46#include <linux/mmc/host.h>
47#include <linux/mmc/mmc.h>
48#include <linux/mmc/sd.h>
49
50#include <linux/uaccess.h>
51
52#include "queue.h"
53#include "block.h"
54#include "core.h"
55#include "card.h"
56#include "crypto.h"
57#include "host.h"
58#include "bus.h"
59#include "mmc_ops.h"
60#include "quirks.h"
61#include "sd_ops.h"
62
63MODULE_ALIAS("mmc:block");
64#ifdef MODULE_PARAM_PREFIX
65#undef MODULE_PARAM_PREFIX
66#endif
67#define MODULE_PARAM_PREFIX "mmcblk."
68
69/*
70 * Set a 10 second timeout for polling write request busy state. Note, mmc core
71 * is setting a 3 second timeout for SD cards, and SDHCI has long had a 10
72 * second software timer to timeout the whole request, so 10 seconds should be
73 * ample.
74 */
75#define MMC_BLK_TIMEOUT_MS (10 * 1000)
76#define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
77#define MMC_EXTRACT_VALUE_FROM_ARG(x) ((x & 0x0000FF00) >> 8)
78
79#define mmc_req_rel_wr(req) ((req->cmd_flags & REQ_FUA) && \
80 (rq_data_dir(req) == WRITE))
81static DEFINE_MUTEX(block_mutex);
82
83/*
84 * The defaults come from config options but can be overriden by module
85 * or bootarg options.
86 */
87static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
88
89/*
90 * We've only got one major, so number of mmcblk devices is
91 * limited to (1 << 20) / number of minors per device. It is also
92 * limited by the MAX_DEVICES below.
93 */
94static int max_devices;
95
96#define MAX_DEVICES 256
97
98static DEFINE_IDA(mmc_blk_ida);
99static DEFINE_IDA(mmc_rpmb_ida);
100
101struct mmc_blk_busy_data {
102 struct mmc_card *card;
103 u32 status;
104};
105
106/*
107 * There is one mmc_blk_data per slot.
108 */
109struct mmc_blk_data {
110 struct device *parent;
111 struct gendisk *disk;
112 struct mmc_queue queue;
113 struct list_head part;
114 struct list_head rpmbs;
115
116 unsigned int flags;
117#define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
118#define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */
119
120 struct kref kref;
121 unsigned int read_only;
122 unsigned int part_type;
123 unsigned int reset_done;
124#define MMC_BLK_READ BIT(0)
125#define MMC_BLK_WRITE BIT(1)
126#define MMC_BLK_DISCARD BIT(2)
127#define MMC_BLK_SECDISCARD BIT(3)
128#define MMC_BLK_CQE_RECOVERY BIT(4)
129#define MMC_BLK_TRIM BIT(5)
130
131 /*
132 * Only set in main mmc_blk_data associated
133 * with mmc_card with dev_set_drvdata, and keeps
134 * track of the current selected device partition.
135 */
136 unsigned int part_curr;
137#define MMC_BLK_PART_INVALID UINT_MAX /* Unknown partition active */
138 int area_type;
139
140 /* debugfs files (only in main mmc_blk_data) */
141 struct dentry *status_dentry;
142 struct dentry *ext_csd_dentry;
143};
144
145/* Device type for RPMB character devices */
146static dev_t mmc_rpmb_devt;
147
148/* Bus type for RPMB character devices */
149static struct bus_type mmc_rpmb_bus_type = {
150 .name = "mmc_rpmb",
151};
152
153/**
154 * struct mmc_rpmb_data - special RPMB device type for these areas
155 * @dev: the device for the RPMB area
156 * @chrdev: character device for the RPMB area
157 * @id: unique device ID number
158 * @part_index: partition index (0 on first)
159 * @md: parent MMC block device
160 * @node: list item, so we can put this device on a list
161 */
162struct mmc_rpmb_data {
163 struct device dev;
164 struct cdev chrdev;
165 int id;
166 unsigned int part_index;
167 struct mmc_blk_data *md;
168 struct list_head node;
169};
170
171static DEFINE_MUTEX(open_lock);
172
173module_param(perdev_minors, int, 0444);
174MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
175
176static inline int mmc_blk_part_switch(struct mmc_card *card,
177 unsigned int part_type);
178static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
179 struct mmc_card *card,
180 int recovery_mode,
181 struct mmc_queue *mq);
182static void mmc_blk_hsq_req_done(struct mmc_request *mrq);
183
184static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
185{
186 struct mmc_blk_data *md;
187
188 mutex_lock(&open_lock);
189 md = disk->private_data;
190 if (md && !kref_get_unless_zero(&md->kref))
191 md = NULL;
192 mutex_unlock(&open_lock);
193
194 return md;
195}
196
197static inline int mmc_get_devidx(struct gendisk *disk)
198{
199 int devidx = disk->first_minor / perdev_minors;
200 return devidx;
201}
202
203static void mmc_blk_kref_release(struct kref *ref)
204{
205 struct mmc_blk_data *md = container_of(ref, struct mmc_blk_data, kref);
206 int devidx;
207
208 devidx = mmc_get_devidx(md->disk);
209 ida_simple_remove(&mmc_blk_ida, devidx);
210
211 mutex_lock(&open_lock);
212 md->disk->private_data = NULL;
213 mutex_unlock(&open_lock);
214
215 put_disk(md->disk);
216 kfree(md);
217}
218
219static void mmc_blk_put(struct mmc_blk_data *md)
220{
221 kref_put(&md->kref, mmc_blk_kref_release);
222}
223
224static ssize_t power_ro_lock_show(struct device *dev,
225 struct device_attribute *attr, char *buf)
226{
227 int ret;
228 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
229 struct mmc_card *card = md->queue.card;
230 int locked = 0;
231
232 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
233 locked = 2;
234 else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
235 locked = 1;
236
237 ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
238
239 mmc_blk_put(md);
240
241 return ret;
242}
243
244static ssize_t power_ro_lock_store(struct device *dev,
245 struct device_attribute *attr, const char *buf, size_t count)
246{
247 int ret;
248 struct mmc_blk_data *md, *part_md;
249 struct mmc_queue *mq;
250 struct request *req;
251 unsigned long set;
252
253 if (kstrtoul(buf, 0, &set))
254 return -EINVAL;
255
256 if (set != 1)
257 return count;
258
259 md = mmc_blk_get(dev_to_disk(dev));
260 mq = &md->queue;
261
262 /* Dispatch locking to the block layer */
263 req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_OUT, 0);
264 if (IS_ERR(req)) {
265 count = PTR_ERR(req);
266 goto out_put;
267 }
268 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_BOOT_WP;
269 blk_execute_rq(req, false);
270 ret = req_to_mmc_queue_req(req)->drv_op_result;
271 blk_mq_free_request(req);
272
273 if (!ret) {
274 pr_info("%s: Locking boot partition ro until next power on\n",
275 md->disk->disk_name);
276 set_disk_ro(md->disk, 1);
277
278 list_for_each_entry(part_md, &md->part, part)
279 if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
280 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
281 set_disk_ro(part_md->disk, 1);
282 }
283 }
284out_put:
285 mmc_blk_put(md);
286 return count;
287}
288
289static DEVICE_ATTR(ro_lock_until_next_power_on, 0,
290 power_ro_lock_show, power_ro_lock_store);
291
292static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
293 char *buf)
294{
295 int ret;
296 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
297
298 ret = snprintf(buf, PAGE_SIZE, "%d\n",
299 get_disk_ro(dev_to_disk(dev)) ^
300 md->read_only);
301 mmc_blk_put(md);
302 return ret;
303}
304
305static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
306 const char *buf, size_t count)
307{
308 int ret;
309 char *end;
310 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
311 unsigned long set = simple_strtoul(buf, &end, 0);
312 if (end == buf) {
313 ret = -EINVAL;
314 goto out;
315 }
316
317 set_disk_ro(dev_to_disk(dev), set || md->read_only);
318 ret = count;
319out:
320 mmc_blk_put(md);
321 return ret;
322}
323
324static DEVICE_ATTR(force_ro, 0644, force_ro_show, force_ro_store);
325
326static struct attribute *mmc_disk_attrs[] = {
327 &dev_attr_force_ro.attr,
328 &dev_attr_ro_lock_until_next_power_on.attr,
329 NULL,
330};
331
332static umode_t mmc_disk_attrs_is_visible(struct kobject *kobj,
333 struct attribute *a, int n)
334{
335 struct device *dev = kobj_to_dev(kobj);
336 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
337 umode_t mode = a->mode;
338
339 if (a == &dev_attr_ro_lock_until_next_power_on.attr &&
340 (md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
341 md->queue.card->ext_csd.boot_ro_lockable) {
342 mode = S_IRUGO;
343 if (!(md->queue.card->ext_csd.boot_ro_lock &
344 EXT_CSD_BOOT_WP_B_PWR_WP_DIS))
345 mode |= S_IWUSR;
346 }
347
348 mmc_blk_put(md);
349 return mode;
350}
351
352static const struct attribute_group mmc_disk_attr_group = {
353 .is_visible = mmc_disk_attrs_is_visible,
354 .attrs = mmc_disk_attrs,
355};
356
357static const struct attribute_group *mmc_disk_attr_groups[] = {
358 &mmc_disk_attr_group,
359 NULL,
360};
361
362static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
363{
364 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
365 int ret = -ENXIO;
366
367 mutex_lock(&block_mutex);
368 if (md) {
369 ret = 0;
370 if ((mode & FMODE_WRITE) && md->read_only) {
371 mmc_blk_put(md);
372 ret = -EROFS;
373 }
374 }
375 mutex_unlock(&block_mutex);
376
377 return ret;
378}
379
380static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
381{
382 struct mmc_blk_data *md = disk->private_data;
383
384 mutex_lock(&block_mutex);
385 mmc_blk_put(md);
386 mutex_unlock(&block_mutex);
387}
388
389static int
390mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
391{
392 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
393 geo->heads = 4;
394 geo->sectors = 16;
395 return 0;
396}
397
398struct mmc_blk_ioc_data {
399 struct mmc_ioc_cmd ic;
400 unsigned char *buf;
401 u64 buf_bytes;
402 struct mmc_rpmb_data *rpmb;
403};
404
405static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
406 struct mmc_ioc_cmd __user *user)
407{
408 struct mmc_blk_ioc_data *idata;
409 int err;
410
411 idata = kmalloc(sizeof(*idata), GFP_KERNEL);
412 if (!idata) {
413 err = -ENOMEM;
414 goto out;
415 }
416
417 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
418 err = -EFAULT;
419 goto idata_err;
420 }
421
422 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
423 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
424 err = -EOVERFLOW;
425 goto idata_err;
426 }
427
428 if (!idata->buf_bytes) {
429 idata->buf = NULL;
430 return idata;
431 }
432
433 idata->buf = memdup_user((void __user *)(unsigned long)
434 idata->ic.data_ptr, idata->buf_bytes);
435 if (IS_ERR(idata->buf)) {
436 err = PTR_ERR(idata->buf);
437 goto idata_err;
438 }
439
440 return idata;
441
442idata_err:
443 kfree(idata);
444out:
445 return ERR_PTR(err);
446}
447
448static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
449 struct mmc_blk_ioc_data *idata)
450{
451 struct mmc_ioc_cmd *ic = &idata->ic;
452
453 if (copy_to_user(&(ic_ptr->response), ic->response,
454 sizeof(ic->response)))
455 return -EFAULT;
456
457 if (!idata->ic.write_flag) {
458 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
459 idata->buf, idata->buf_bytes))
460 return -EFAULT;
461 }
462
463 return 0;
464}
465
466static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
467 struct mmc_blk_ioc_data *idata)
468{
469 struct mmc_command cmd = {}, sbc = {};
470 struct mmc_data data = {};
471 struct mmc_request mrq = {};
472 struct scatterlist sg;
473 int err;
474 unsigned int target_part;
475
476 if (!card || !md || !idata)
477 return -EINVAL;
478
479 /*
480 * The RPMB accesses comes in from the character device, so we
481 * need to target these explicitly. Else we just target the
482 * partition type for the block device the ioctl() was issued
483 * on.
484 */
485 if (idata->rpmb) {
486 /* Support multiple RPMB partitions */
487 target_part = idata->rpmb->part_index;
488 target_part |= EXT_CSD_PART_CONFIG_ACC_RPMB;
489 } else {
490 target_part = md->part_type;
491 }
492
493 cmd.opcode = idata->ic.opcode;
494 cmd.arg = idata->ic.arg;
495 cmd.flags = idata->ic.flags;
496
497 if (idata->buf_bytes) {
498 data.sg = &sg;
499 data.sg_len = 1;
500 data.blksz = idata->ic.blksz;
501 data.blocks = idata->ic.blocks;
502
503 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
504
505 if (idata->ic.write_flag)
506 data.flags = MMC_DATA_WRITE;
507 else
508 data.flags = MMC_DATA_READ;
509
510 /* data.flags must already be set before doing this. */
511 mmc_set_data_timeout(&data, card);
512
513 /* Allow overriding the timeout_ns for empirical tuning. */
514 if (idata->ic.data_timeout_ns)
515 data.timeout_ns = idata->ic.data_timeout_ns;
516
517 mrq.data = &data;
518 }
519
520 mrq.cmd = &cmd;
521
522 err = mmc_blk_part_switch(card, target_part);
523 if (err)
524 return err;
525
526 if (idata->ic.is_acmd) {
527 err = mmc_app_cmd(card->host, card);
528 if (err)
529 return err;
530 }
531
532 if (idata->rpmb) {
533 sbc.opcode = MMC_SET_BLOCK_COUNT;
534 /*
535 * We don't do any blockcount validation because the max size
536 * may be increased by a future standard. We just copy the
537 * 'Reliable Write' bit here.
538 */
539 sbc.arg = data.blocks | (idata->ic.write_flag & BIT(31));
540 sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
541 mrq.sbc = &sbc;
542 }
543
544 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
545 (cmd.opcode == MMC_SWITCH))
546 return mmc_sanitize(card, idata->ic.cmd_timeout_ms);
547
548 mmc_wait_for_req(card->host, &mrq);
549 memcpy(&idata->ic.response, cmd.resp, sizeof(cmd.resp));
550
551 if (cmd.error) {
552 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
553 __func__, cmd.error);
554 return cmd.error;
555 }
556 if (data.error) {
557 dev_err(mmc_dev(card->host), "%s: data error %d\n",
558 __func__, data.error);
559 return data.error;
560 }
561
562 /*
563 * Make sure the cache of the PARTITION_CONFIG register and
564 * PARTITION_ACCESS bits is updated in case the ioctl ext_csd write
565 * changed it successfully.
566 */
567 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_PART_CONFIG) &&
568 (cmd.opcode == MMC_SWITCH)) {
569 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
570 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg);
571
572 /*
573 * Update cache so the next mmc_blk_part_switch call operates
574 * on up-to-date data.
575 */
576 card->ext_csd.part_config = value;
577 main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK;
578 }
579
580 /*
581 * Make sure to update CACHE_CTRL in case it was changed. The cache
582 * will get turned back on if the card is re-initialized, e.g.
583 * suspend/resume or hw reset in recovery.
584 */
585 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_CACHE_CTRL) &&
586 (cmd.opcode == MMC_SWITCH)) {
587 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg) & 1;
588
589 card->ext_csd.cache_ctrl = value;
590 }
591
592 /*
593 * According to the SD specs, some commands require a delay after
594 * issuing the command.
595 */
596 if (idata->ic.postsleep_min_us)
597 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
598
599 if (idata->rpmb || (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
600 /*
601 * Ensure RPMB/R1B command has completed by polling CMD13 "Send Status". Here we
602 * allow to override the default timeout value if a custom timeout is specified.
603 */
604 err = mmc_poll_for_busy(card, idata->ic.cmd_timeout_ms ? : MMC_BLK_TIMEOUT_MS,
605 false, MMC_BUSY_IO);
606 }
607
608 return err;
609}
610
611static int mmc_blk_ioctl_cmd(struct mmc_blk_data *md,
612 struct mmc_ioc_cmd __user *ic_ptr,
613 struct mmc_rpmb_data *rpmb)
614{
615 struct mmc_blk_ioc_data *idata;
616 struct mmc_blk_ioc_data *idatas[1];
617 struct mmc_queue *mq;
618 struct mmc_card *card;
619 int err = 0, ioc_err = 0;
620 struct request *req;
621
622 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
623 if (IS_ERR(idata))
624 return PTR_ERR(idata);
625 /* This will be NULL on non-RPMB ioctl():s */
626 idata->rpmb = rpmb;
627
628 card = md->queue.card;
629 if (IS_ERR(card)) {
630 err = PTR_ERR(card);
631 goto cmd_done;
632 }
633
634 /*
635 * Dispatch the ioctl() into the block request queue.
636 */
637 mq = &md->queue;
638 req = blk_mq_alloc_request(mq->queue,
639 idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
640 if (IS_ERR(req)) {
641 err = PTR_ERR(req);
642 goto cmd_done;
643 }
644 idatas[0] = idata;
645 req_to_mmc_queue_req(req)->drv_op =
646 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
647 req_to_mmc_queue_req(req)->drv_op_data = idatas;
648 req_to_mmc_queue_req(req)->ioc_count = 1;
649 blk_execute_rq(req, false);
650 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
651 err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
652 blk_mq_free_request(req);
653
654cmd_done:
655 kfree(idata->buf);
656 kfree(idata);
657 return ioc_err ? ioc_err : err;
658}
659
660static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md,
661 struct mmc_ioc_multi_cmd __user *user,
662 struct mmc_rpmb_data *rpmb)
663{
664 struct mmc_blk_ioc_data **idata = NULL;
665 struct mmc_ioc_cmd __user *cmds = user->cmds;
666 struct mmc_card *card;
667 struct mmc_queue *mq;
668 int err = 0, ioc_err = 0;
669 __u64 num_of_cmds;
670 unsigned int i, n;
671 struct request *req;
672
673 if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
674 sizeof(num_of_cmds)))
675 return -EFAULT;
676
677 if (!num_of_cmds)
678 return 0;
679
680 if (num_of_cmds > MMC_IOC_MAX_CMDS)
681 return -EINVAL;
682
683 n = num_of_cmds;
684 idata = kcalloc(n, sizeof(*idata), GFP_KERNEL);
685 if (!idata)
686 return -ENOMEM;
687
688 for (i = 0; i < n; i++) {
689 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
690 if (IS_ERR(idata[i])) {
691 err = PTR_ERR(idata[i]);
692 n = i;
693 goto cmd_err;
694 }
695 /* This will be NULL on non-RPMB ioctl():s */
696 idata[i]->rpmb = rpmb;
697 }
698
699 card = md->queue.card;
700 if (IS_ERR(card)) {
701 err = PTR_ERR(card);
702 goto cmd_err;
703 }
704
705
706 /*
707 * Dispatch the ioctl()s into the block request queue.
708 */
709 mq = &md->queue;
710 req = blk_mq_alloc_request(mq->queue,
711 idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
712 if (IS_ERR(req)) {
713 err = PTR_ERR(req);
714 goto cmd_err;
715 }
716 req_to_mmc_queue_req(req)->drv_op =
717 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
718 req_to_mmc_queue_req(req)->drv_op_data = idata;
719 req_to_mmc_queue_req(req)->ioc_count = n;
720 blk_execute_rq(req, false);
721 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
722
723 /* copy to user if data and response */
724 for (i = 0; i < n && !err; i++)
725 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
726
727 blk_mq_free_request(req);
728
729cmd_err:
730 for (i = 0; i < n; i++) {
731 kfree(idata[i]->buf);
732 kfree(idata[i]);
733 }
734 kfree(idata);
735 return ioc_err ? ioc_err : err;
736}
737
738static int mmc_blk_check_blkdev(struct block_device *bdev)
739{
740 /*
741 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
742 * whole block device, not on a partition. This prevents overspray
743 * between sibling partitions.
744 */
745 if (!capable(CAP_SYS_RAWIO) || bdev_is_partition(bdev))
746 return -EPERM;
747 return 0;
748}
749
750static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
751 unsigned int cmd, unsigned long arg)
752{
753 struct mmc_blk_data *md;
754 int ret;
755
756 switch (cmd) {
757 case MMC_IOC_CMD:
758 ret = mmc_blk_check_blkdev(bdev);
759 if (ret)
760 return ret;
761 md = mmc_blk_get(bdev->bd_disk);
762 if (!md)
763 return -EINVAL;
764 ret = mmc_blk_ioctl_cmd(md,
765 (struct mmc_ioc_cmd __user *)arg,
766 NULL);
767 mmc_blk_put(md);
768 return ret;
769 case MMC_IOC_MULTI_CMD:
770 ret = mmc_blk_check_blkdev(bdev);
771 if (ret)
772 return ret;
773 md = mmc_blk_get(bdev->bd_disk);
774 if (!md)
775 return -EINVAL;
776 ret = mmc_blk_ioctl_multi_cmd(md,
777 (struct mmc_ioc_multi_cmd __user *)arg,
778 NULL);
779 mmc_blk_put(md);
780 return ret;
781 default:
782 return -EINVAL;
783 }
784}
785
786#ifdef CONFIG_COMPAT
787static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
788 unsigned int cmd, unsigned long arg)
789{
790 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
791}
792#endif
793
794static int mmc_blk_alternative_gpt_sector(struct gendisk *disk,
795 sector_t *sector)
796{
797 struct mmc_blk_data *md;
798 int ret;
799
800 md = mmc_blk_get(disk);
801 if (!md)
802 return -EINVAL;
803
804 if (md->queue.card)
805 ret = mmc_card_alternative_gpt_sector(md->queue.card, sector);
806 else
807 ret = -ENODEV;
808
809 mmc_blk_put(md);
810
811 return ret;
812}
813
814static const struct block_device_operations mmc_bdops = {
815 .open = mmc_blk_open,
816 .release = mmc_blk_release,
817 .getgeo = mmc_blk_getgeo,
818 .owner = THIS_MODULE,
819 .ioctl = mmc_blk_ioctl,
820#ifdef CONFIG_COMPAT
821 .compat_ioctl = mmc_blk_compat_ioctl,
822#endif
823 .alternative_gpt_sector = mmc_blk_alternative_gpt_sector,
824};
825
826static int mmc_blk_part_switch_pre(struct mmc_card *card,
827 unsigned int part_type)
828{
829 int ret = 0;
830
831 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
832 if (card->ext_csd.cmdq_en) {
833 ret = mmc_cmdq_disable(card);
834 if (ret)
835 return ret;
836 }
837 mmc_retune_pause(card->host);
838 }
839
840 return ret;
841}
842
843static int mmc_blk_part_switch_post(struct mmc_card *card,
844 unsigned int part_type)
845{
846 int ret = 0;
847
848 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
849 mmc_retune_unpause(card->host);
850 if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
851 ret = mmc_cmdq_enable(card);
852 }
853
854 return ret;
855}
856
857static inline int mmc_blk_part_switch(struct mmc_card *card,
858 unsigned int part_type)
859{
860 int ret = 0;
861 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
862
863 if (main_md->part_curr == part_type)
864 return 0;
865
866 if (mmc_card_mmc(card)) {
867 u8 part_config = card->ext_csd.part_config;
868
869 ret = mmc_blk_part_switch_pre(card, part_type);
870 if (ret)
871 return ret;
872
873 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
874 part_config |= part_type;
875
876 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
877 EXT_CSD_PART_CONFIG, part_config,
878 card->ext_csd.part_time);
879 if (ret) {
880 mmc_blk_part_switch_post(card, part_type);
881 return ret;
882 }
883
884 card->ext_csd.part_config = part_config;
885
886 ret = mmc_blk_part_switch_post(card, main_md->part_curr);
887 }
888
889 main_md->part_curr = part_type;
890 return ret;
891}
892
893static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
894{
895 int err;
896 u32 result;
897 __be32 *blocks;
898
899 struct mmc_request mrq = {};
900 struct mmc_command cmd = {};
901 struct mmc_data data = {};
902
903 struct scatterlist sg;
904
905 cmd.opcode = MMC_APP_CMD;
906 cmd.arg = card->rca << 16;
907 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
908
909 err = mmc_wait_for_cmd(card->host, &cmd, 0);
910 if (err)
911 return err;
912 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
913 return -EIO;
914
915 memset(&cmd, 0, sizeof(struct mmc_command));
916
917 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
918 cmd.arg = 0;
919 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
920
921 data.blksz = 4;
922 data.blocks = 1;
923 data.flags = MMC_DATA_READ;
924 data.sg = &sg;
925 data.sg_len = 1;
926 mmc_set_data_timeout(&data, card);
927
928 mrq.cmd = &cmd;
929 mrq.data = &data;
930
931 blocks = kmalloc(4, GFP_KERNEL);
932 if (!blocks)
933 return -ENOMEM;
934
935 sg_init_one(&sg, blocks, 4);
936
937 mmc_wait_for_req(card->host, &mrq);
938
939 result = ntohl(*blocks);
940 kfree(blocks);
941
942 if (cmd.error || data.error)
943 return -EIO;
944
945 *written_blocks = result;
946
947 return 0;
948}
949
950static unsigned int mmc_blk_clock_khz(struct mmc_host *host)
951{
952 if (host->actual_clock)
953 return host->actual_clock / 1000;
954
955 /* Clock may be subject to a divisor, fudge it by a factor of 2. */
956 if (host->ios.clock)
957 return host->ios.clock / 2000;
958
959 /* How can there be no clock */
960 WARN_ON_ONCE(1);
961 return 100; /* 100 kHz is minimum possible value */
962}
963
964static unsigned int mmc_blk_data_timeout_ms(struct mmc_host *host,
965 struct mmc_data *data)
966{
967 unsigned int ms = DIV_ROUND_UP(data->timeout_ns, 1000000);
968 unsigned int khz;
969
970 if (data->timeout_clks) {
971 khz = mmc_blk_clock_khz(host);
972 ms += DIV_ROUND_UP(data->timeout_clks, khz);
973 }
974
975 return ms;
976}
977
978/*
979 * Attempts to reset the card and get back to the requested partition.
980 * Therefore any error here must result in cancelling the block layer
981 * request, it must not be reattempted without going through the mmc_blk
982 * partition sanity checks.
983 */
984static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
985 int type)
986{
987 int err;
988 struct mmc_blk_data *main_md = dev_get_drvdata(&host->card->dev);
989
990 if (md->reset_done & type)
991 return -EEXIST;
992
993 md->reset_done |= type;
994 err = mmc_hw_reset(host->card);
995 /*
996 * A successful reset will leave the card in the main partition, but
997 * upon failure it might not be, so set it to MMC_BLK_PART_INVALID
998 * in that case.
999 */
1000 main_md->part_curr = err ? MMC_BLK_PART_INVALID : main_md->part_type;
1001 if (err)
1002 return err;
1003 /* Ensure we switch back to the correct partition */
1004 if (mmc_blk_part_switch(host->card, md->part_type))
1005 /*
1006 * We have failed to get back into the correct
1007 * partition, so we need to abort the whole request.
1008 */
1009 return -ENODEV;
1010 return 0;
1011}
1012
1013static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1014{
1015 md->reset_done &= ~type;
1016}
1017
1018/*
1019 * The non-block commands come back from the block layer after it queued it and
1020 * processed it with all other requests and then they get issued in this
1021 * function.
1022 */
1023static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
1024{
1025 struct mmc_queue_req *mq_rq;
1026 struct mmc_card *card = mq->card;
1027 struct mmc_blk_data *md = mq->blkdata;
1028 struct mmc_blk_ioc_data **idata;
1029 bool rpmb_ioctl;
1030 u8 **ext_csd;
1031 u32 status;
1032 int ret;
1033 int i;
1034
1035 mq_rq = req_to_mmc_queue_req(req);
1036 rpmb_ioctl = (mq_rq->drv_op == MMC_DRV_OP_IOCTL_RPMB);
1037
1038 switch (mq_rq->drv_op) {
1039 case MMC_DRV_OP_IOCTL:
1040 if (card->ext_csd.cmdq_en) {
1041 ret = mmc_cmdq_disable(card);
1042 if (ret)
1043 break;
1044 }
1045 fallthrough;
1046 case MMC_DRV_OP_IOCTL_RPMB:
1047 idata = mq_rq->drv_op_data;
1048 for (i = 0, ret = 0; i < mq_rq->ioc_count; i++) {
1049 ret = __mmc_blk_ioctl_cmd(card, md, idata[i]);
1050 if (ret)
1051 break;
1052 }
1053 /* Always switch back to main area after RPMB access */
1054 if (rpmb_ioctl)
1055 mmc_blk_part_switch(card, 0);
1056 else if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
1057 mmc_cmdq_enable(card);
1058 break;
1059 case MMC_DRV_OP_BOOT_WP:
1060 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
1061 card->ext_csd.boot_ro_lock |
1062 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
1063 card->ext_csd.part_time);
1064 if (ret)
1065 pr_err("%s: Locking boot partition ro until next power on failed: %d\n",
1066 md->disk->disk_name, ret);
1067 else
1068 card->ext_csd.boot_ro_lock |=
1069 EXT_CSD_BOOT_WP_B_PWR_WP_EN;
1070 break;
1071 case MMC_DRV_OP_GET_CARD_STATUS:
1072 ret = mmc_send_status(card, &status);
1073 if (!ret)
1074 ret = status;
1075 break;
1076 case MMC_DRV_OP_GET_EXT_CSD:
1077 ext_csd = mq_rq->drv_op_data;
1078 ret = mmc_get_ext_csd(card, ext_csd);
1079 break;
1080 default:
1081 pr_err("%s: unknown driver specific operation\n",
1082 md->disk->disk_name);
1083 ret = -EINVAL;
1084 break;
1085 }
1086 mq_rq->drv_op_result = ret;
1087 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1088}
1089
1090static void mmc_blk_issue_erase_rq(struct mmc_queue *mq, struct request *req,
1091 int type, unsigned int erase_arg)
1092{
1093 struct mmc_blk_data *md = mq->blkdata;
1094 struct mmc_card *card = md->queue.card;
1095 unsigned int from, nr;
1096 int err = 0;
1097 blk_status_t status = BLK_STS_OK;
1098
1099 if (!mmc_can_erase(card)) {
1100 status = BLK_STS_NOTSUPP;
1101 goto fail;
1102 }
1103
1104 from = blk_rq_pos(req);
1105 nr = blk_rq_sectors(req);
1106
1107 do {
1108 err = 0;
1109 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1110 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1111 INAND_CMD38_ARG_EXT_CSD,
1112 erase_arg == MMC_TRIM_ARG ?
1113 INAND_CMD38_ARG_TRIM :
1114 INAND_CMD38_ARG_ERASE,
1115 card->ext_csd.generic_cmd6_time);
1116 }
1117 if (!err)
1118 err = mmc_erase(card, from, nr, erase_arg);
1119 } while (err == -EIO && !mmc_blk_reset(md, card->host, type));
1120 if (err)
1121 status = BLK_STS_IOERR;
1122 else
1123 mmc_blk_reset_success(md, type);
1124fail:
1125 blk_mq_end_request(req, status);
1126}
1127
1128static void mmc_blk_issue_trim_rq(struct mmc_queue *mq, struct request *req)
1129{
1130 mmc_blk_issue_erase_rq(mq, req, MMC_BLK_TRIM, MMC_TRIM_ARG);
1131}
1132
1133static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1134{
1135 struct mmc_blk_data *md = mq->blkdata;
1136 struct mmc_card *card = md->queue.card;
1137 unsigned int arg = card->erase_arg;
1138
1139 if (mmc_card_broken_sd_discard(card))
1140 arg = SD_ERASE_ARG;
1141
1142 mmc_blk_issue_erase_rq(mq, req, MMC_BLK_DISCARD, arg);
1143}
1144
1145static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1146 struct request *req)
1147{
1148 struct mmc_blk_data *md = mq->blkdata;
1149 struct mmc_card *card = md->queue.card;
1150 unsigned int from, nr, arg;
1151 int err = 0, type = MMC_BLK_SECDISCARD;
1152 blk_status_t status = BLK_STS_OK;
1153
1154 if (!(mmc_can_secure_erase_trim(card))) {
1155 status = BLK_STS_NOTSUPP;
1156 goto out;
1157 }
1158
1159 from = blk_rq_pos(req);
1160 nr = blk_rq_sectors(req);
1161
1162 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1163 arg = MMC_SECURE_TRIM1_ARG;
1164 else
1165 arg = MMC_SECURE_ERASE_ARG;
1166
1167retry:
1168 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1169 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1170 INAND_CMD38_ARG_EXT_CSD,
1171 arg == MMC_SECURE_TRIM1_ARG ?
1172 INAND_CMD38_ARG_SECTRIM1 :
1173 INAND_CMD38_ARG_SECERASE,
1174 card->ext_csd.generic_cmd6_time);
1175 if (err)
1176 goto out_retry;
1177 }
1178
1179 err = mmc_erase(card, from, nr, arg);
1180 if (err == -EIO)
1181 goto out_retry;
1182 if (err) {
1183 status = BLK_STS_IOERR;
1184 goto out;
1185 }
1186
1187 if (arg == MMC_SECURE_TRIM1_ARG) {
1188 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1189 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1190 INAND_CMD38_ARG_EXT_CSD,
1191 INAND_CMD38_ARG_SECTRIM2,
1192 card->ext_csd.generic_cmd6_time);
1193 if (err)
1194 goto out_retry;
1195 }
1196
1197 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1198 if (err == -EIO)
1199 goto out_retry;
1200 if (err) {
1201 status = BLK_STS_IOERR;
1202 goto out;
1203 }
1204 }
1205
1206out_retry:
1207 if (err && !mmc_blk_reset(md, card->host, type))
1208 goto retry;
1209 if (!err)
1210 mmc_blk_reset_success(md, type);
1211out:
1212 blk_mq_end_request(req, status);
1213}
1214
1215static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1216{
1217 struct mmc_blk_data *md = mq->blkdata;
1218 struct mmc_card *card = md->queue.card;
1219 int ret = 0;
1220
1221 ret = mmc_flush_cache(card->host);
1222 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1223}
1224
1225/*
1226 * Reformat current write as a reliable write, supporting
1227 * both legacy and the enhanced reliable write MMC cards.
1228 * In each transfer we'll handle only as much as a single
1229 * reliable write can handle, thus finish the request in
1230 * partial completions.
1231 */
1232static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1233 struct mmc_card *card,
1234 struct request *req)
1235{
1236 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1237 /* Legacy mode imposes restrictions on transfers. */
1238 if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors))
1239 brq->data.blocks = 1;
1240
1241 if (brq->data.blocks > card->ext_csd.rel_sectors)
1242 brq->data.blocks = card->ext_csd.rel_sectors;
1243 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1244 brq->data.blocks = 1;
1245 }
1246}
1247
1248#define CMD_ERRORS_EXCL_OOR \
1249 (R1_ADDRESS_ERROR | /* Misaligned address */ \
1250 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
1251 R1_WP_VIOLATION | /* Tried to write to protected block */ \
1252 R1_CARD_ECC_FAILED | /* Card ECC failed */ \
1253 R1_CC_ERROR | /* Card controller error */ \
1254 R1_ERROR) /* General/unknown error */
1255
1256#define CMD_ERRORS \
1257 (CMD_ERRORS_EXCL_OOR | \
1258 R1_OUT_OF_RANGE) /* Command argument out of range */ \
1259
1260static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq)
1261{
1262 u32 val;
1263
1264 /*
1265 * Per the SD specification(physical layer version 4.10)[1],
1266 * section 4.3.3, it explicitly states that "When the last
1267 * block of user area is read using CMD18, the host should
1268 * ignore OUT_OF_RANGE error that may occur even the sequence
1269 * is correct". And JESD84-B51 for eMMC also has a similar
1270 * statement on section 6.8.3.
1271 *
1272 * Multiple block read/write could be done by either predefined
1273 * method, namely CMD23, or open-ending mode. For open-ending mode,
1274 * we should ignore the OUT_OF_RANGE error as it's normal behaviour.
1275 *
1276 * However the spec[1] doesn't tell us whether we should also
1277 * ignore that for predefined method. But per the spec[1], section
1278 * 4.15 Set Block Count Command, it says"If illegal block count
1279 * is set, out of range error will be indicated during read/write
1280 * operation (For example, data transfer is stopped at user area
1281 * boundary)." In another word, we could expect a out of range error
1282 * in the response for the following CMD18/25. And if argument of
1283 * CMD23 + the argument of CMD18/25 exceed the max number of blocks,
1284 * we could also expect to get a -ETIMEDOUT or any error number from
1285 * the host drivers due to missing data response(for write)/data(for
1286 * read), as the cards will stop the data transfer by itself per the
1287 * spec. So we only need to check R1_OUT_OF_RANGE for open-ending mode.
1288 */
1289
1290 if (!brq->stop.error) {
1291 bool oor_with_open_end;
1292 /* If there is no error yet, check R1 response */
1293
1294 val = brq->stop.resp[0] & CMD_ERRORS;
1295 oor_with_open_end = val & R1_OUT_OF_RANGE && !brq->mrq.sbc;
1296
1297 if (val && !oor_with_open_end)
1298 brq->stop.error = -EIO;
1299 }
1300}
1301
1302static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
1303 int recovery_mode, bool *do_rel_wr_p,
1304 bool *do_data_tag_p)
1305{
1306 struct mmc_blk_data *md = mq->blkdata;
1307 struct mmc_card *card = md->queue.card;
1308 struct mmc_blk_request *brq = &mqrq->brq;
1309 struct request *req = mmc_queue_req_to_req(mqrq);
1310 bool do_rel_wr, do_data_tag;
1311
1312 /*
1313 * Reliable writes are used to implement Forced Unit Access and
1314 * are supported only on MMCs.
1315 */
1316 do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1317 rq_data_dir(req) == WRITE &&
1318 (md->flags & MMC_BLK_REL_WR);
1319
1320 memset(brq, 0, sizeof(struct mmc_blk_request));
1321
1322 mmc_crypto_prepare_req(mqrq);
1323
1324 brq->mrq.data = &brq->data;
1325 brq->mrq.tag = req->tag;
1326
1327 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1328 brq->stop.arg = 0;
1329
1330 if (rq_data_dir(req) == READ) {
1331 brq->data.flags = MMC_DATA_READ;
1332 brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1333 } else {
1334 brq->data.flags = MMC_DATA_WRITE;
1335 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1336 }
1337
1338 brq->data.blksz = 512;
1339 brq->data.blocks = blk_rq_sectors(req);
1340 brq->data.blk_addr = blk_rq_pos(req);
1341
1342 /*
1343 * The command queue supports 2 priorities: "high" (1) and "simple" (0).
1344 * The eMMC will give "high" priority tasks priority over "simple"
1345 * priority tasks. Here we always set "simple" priority by not setting
1346 * MMC_DATA_PRIO.
1347 */
1348
1349 /*
1350 * The block layer doesn't support all sector count
1351 * restrictions, so we need to be prepared for too big
1352 * requests.
1353 */
1354 if (brq->data.blocks > card->host->max_blk_count)
1355 brq->data.blocks = card->host->max_blk_count;
1356
1357 if (brq->data.blocks > 1) {
1358 /*
1359 * Some SD cards in SPI mode return a CRC error or even lock up
1360 * completely when trying to read the last block using a
1361 * multiblock read command.
1362 */
1363 if (mmc_host_is_spi(card->host) && (rq_data_dir(req) == READ) &&
1364 (blk_rq_pos(req) + blk_rq_sectors(req) ==
1365 get_capacity(md->disk)))
1366 brq->data.blocks--;
1367
1368 /*
1369 * After a read error, we redo the request one (native) sector
1370 * at a time in order to accurately determine which
1371 * sectors can be read successfully.
1372 */
1373 if (recovery_mode)
1374 brq->data.blocks = queue_physical_block_size(mq->queue) >> 9;
1375
1376 /*
1377 * Some controllers have HW issues while operating
1378 * in multiple I/O mode
1379 */
1380 if (card->host->ops->multi_io_quirk)
1381 brq->data.blocks = card->host->ops->multi_io_quirk(card,
1382 (rq_data_dir(req) == READ) ?
1383 MMC_DATA_READ : MMC_DATA_WRITE,
1384 brq->data.blocks);
1385 }
1386
1387 if (do_rel_wr) {
1388 mmc_apply_rel_rw(brq, card, req);
1389 brq->data.flags |= MMC_DATA_REL_WR;
1390 }
1391
1392 /*
1393 * Data tag is used only during writing meta data to speed
1394 * up write and any subsequent read of this meta data
1395 */
1396 do_data_tag = card->ext_csd.data_tag_unit_size &&
1397 (req->cmd_flags & REQ_META) &&
1398 (rq_data_dir(req) == WRITE) &&
1399 ((brq->data.blocks * brq->data.blksz) >=
1400 card->ext_csd.data_tag_unit_size);
1401
1402 if (do_data_tag)
1403 brq->data.flags |= MMC_DATA_DAT_TAG;
1404
1405 mmc_set_data_timeout(&brq->data, card);
1406
1407 brq->data.sg = mqrq->sg;
1408 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1409
1410 /*
1411 * Adjust the sg list so it is the same size as the
1412 * request.
1413 */
1414 if (brq->data.blocks != blk_rq_sectors(req)) {
1415 int i, data_size = brq->data.blocks << 9;
1416 struct scatterlist *sg;
1417
1418 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1419 data_size -= sg->length;
1420 if (data_size <= 0) {
1421 sg->length += data_size;
1422 i++;
1423 break;
1424 }
1425 }
1426 brq->data.sg_len = i;
1427 }
1428
1429 if (do_rel_wr_p)
1430 *do_rel_wr_p = do_rel_wr;
1431
1432 if (do_data_tag_p)
1433 *do_data_tag_p = do_data_tag;
1434}
1435
1436#define MMC_CQE_RETRIES 2
1437
1438static void mmc_blk_cqe_complete_rq(struct mmc_queue *mq, struct request *req)
1439{
1440 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1441 struct mmc_request *mrq = &mqrq->brq.mrq;
1442 struct request_queue *q = req->q;
1443 struct mmc_host *host = mq->card->host;
1444 enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
1445 unsigned long flags;
1446 bool put_card;
1447 int err;
1448
1449 mmc_cqe_post_req(host, mrq);
1450
1451 if (mrq->cmd && mrq->cmd->error)
1452 err = mrq->cmd->error;
1453 else if (mrq->data && mrq->data->error)
1454 err = mrq->data->error;
1455 else
1456 err = 0;
1457
1458 if (err) {
1459 if (mqrq->retries++ < MMC_CQE_RETRIES)
1460 blk_mq_requeue_request(req, true);
1461 else
1462 blk_mq_end_request(req, BLK_STS_IOERR);
1463 } else if (mrq->data) {
1464 if (blk_update_request(req, BLK_STS_OK, mrq->data->bytes_xfered))
1465 blk_mq_requeue_request(req, true);
1466 else
1467 __blk_mq_end_request(req, BLK_STS_OK);
1468 } else {
1469 blk_mq_end_request(req, BLK_STS_OK);
1470 }
1471
1472 spin_lock_irqsave(&mq->lock, flags);
1473
1474 mq->in_flight[issue_type] -= 1;
1475
1476 put_card = (mmc_tot_in_flight(mq) == 0);
1477
1478 mmc_cqe_check_busy(mq);
1479
1480 spin_unlock_irqrestore(&mq->lock, flags);
1481
1482 if (!mq->cqe_busy)
1483 blk_mq_run_hw_queues(q, true);
1484
1485 if (put_card)
1486 mmc_put_card(mq->card, &mq->ctx);
1487}
1488
1489void mmc_blk_cqe_recovery(struct mmc_queue *mq)
1490{
1491 struct mmc_card *card = mq->card;
1492 struct mmc_host *host = card->host;
1493 int err;
1494
1495 pr_debug("%s: CQE recovery start\n", mmc_hostname(host));
1496
1497 err = mmc_cqe_recovery(host);
1498 if (err)
1499 mmc_blk_reset(mq->blkdata, host, MMC_BLK_CQE_RECOVERY);
1500 mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
1501
1502 pr_debug("%s: CQE recovery done\n", mmc_hostname(host));
1503}
1504
1505static void mmc_blk_cqe_req_done(struct mmc_request *mrq)
1506{
1507 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
1508 brq.mrq);
1509 struct request *req = mmc_queue_req_to_req(mqrq);
1510 struct request_queue *q = req->q;
1511 struct mmc_queue *mq = q->queuedata;
1512
1513 /*
1514 * Block layer timeouts race with completions which means the normal
1515 * completion path cannot be used during recovery.
1516 */
1517 if (mq->in_recovery)
1518 mmc_blk_cqe_complete_rq(mq, req);
1519 else if (likely(!blk_should_fake_timeout(req->q)))
1520 blk_mq_complete_request(req);
1521}
1522
1523static int mmc_blk_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
1524{
1525 mrq->done = mmc_blk_cqe_req_done;
1526 mrq->recovery_notifier = mmc_cqe_recovery_notifier;
1527
1528 return mmc_cqe_start_req(host, mrq);
1529}
1530
1531static struct mmc_request *mmc_blk_cqe_prep_dcmd(struct mmc_queue_req *mqrq,
1532 struct request *req)
1533{
1534 struct mmc_blk_request *brq = &mqrq->brq;
1535
1536 memset(brq, 0, sizeof(*brq));
1537
1538 brq->mrq.cmd = &brq->cmd;
1539 brq->mrq.tag = req->tag;
1540
1541 return &brq->mrq;
1542}
1543
1544static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req)
1545{
1546 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1547 struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req);
1548
1549 mrq->cmd->opcode = MMC_SWITCH;
1550 mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1551 (EXT_CSD_FLUSH_CACHE << 16) |
1552 (1 << 8) |
1553 EXT_CSD_CMD_SET_NORMAL;
1554 mrq->cmd->flags = MMC_CMD_AC | MMC_RSP_R1B;
1555
1556 return mmc_blk_cqe_start_req(mq->card->host, mrq);
1557}
1558
1559static int mmc_blk_hsq_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1560{
1561 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1562 struct mmc_host *host = mq->card->host;
1563 int err;
1564
1565 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
1566 mqrq->brq.mrq.done = mmc_blk_hsq_req_done;
1567 mmc_pre_req(host, &mqrq->brq.mrq);
1568
1569 err = mmc_cqe_start_req(host, &mqrq->brq.mrq);
1570 if (err)
1571 mmc_post_req(host, &mqrq->brq.mrq, err);
1572
1573 return err;
1574}
1575
1576static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1577{
1578 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1579 struct mmc_host *host = mq->card->host;
1580
1581 if (host->hsq_enabled)
1582 return mmc_blk_hsq_issue_rw_rq(mq, req);
1583
1584 mmc_blk_data_prep(mq, mqrq, 0, NULL, NULL);
1585
1586 return mmc_blk_cqe_start_req(mq->card->host, &mqrq->brq.mrq);
1587}
1588
1589static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1590 struct mmc_card *card,
1591 int recovery_mode,
1592 struct mmc_queue *mq)
1593{
1594 u32 readcmd, writecmd;
1595 struct mmc_blk_request *brq = &mqrq->brq;
1596 struct request *req = mmc_queue_req_to_req(mqrq);
1597 struct mmc_blk_data *md = mq->blkdata;
1598 bool do_rel_wr, do_data_tag;
1599
1600 mmc_blk_data_prep(mq, mqrq, recovery_mode, &do_rel_wr, &do_data_tag);
1601
1602 brq->mrq.cmd = &brq->cmd;
1603
1604 brq->cmd.arg = blk_rq_pos(req);
1605 if (!mmc_card_blockaddr(card))
1606 brq->cmd.arg <<= 9;
1607 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1608
1609 if (brq->data.blocks > 1 || do_rel_wr) {
1610 /* SPI multiblock writes terminate using a special
1611 * token, not a STOP_TRANSMISSION request.
1612 */
1613 if (!mmc_host_is_spi(card->host) ||
1614 rq_data_dir(req) == READ)
1615 brq->mrq.stop = &brq->stop;
1616 readcmd = MMC_READ_MULTIPLE_BLOCK;
1617 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1618 } else {
1619 brq->mrq.stop = NULL;
1620 readcmd = MMC_READ_SINGLE_BLOCK;
1621 writecmd = MMC_WRITE_BLOCK;
1622 }
1623 brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd;
1624
1625 /*
1626 * Pre-defined multi-block transfers are preferable to
1627 * open ended-ones (and necessary for reliable writes).
1628 * However, it is not sufficient to just send CMD23,
1629 * and avoid the final CMD12, as on an error condition
1630 * CMD12 (stop) needs to be sent anyway. This, coupled
1631 * with Auto-CMD23 enhancements provided by some
1632 * hosts, means that the complexity of dealing
1633 * with this is best left to the host. If CMD23 is
1634 * supported by card and host, we'll fill sbc in and let
1635 * the host deal with handling it correctly. This means
1636 * that for hosts that don't expose MMC_CAP_CMD23, no
1637 * change of behavior will be observed.
1638 *
1639 * N.B: Some MMC cards experience perf degradation.
1640 * We'll avoid using CMD23-bounded multiblock writes for
1641 * these, while retaining features like reliable writes.
1642 */
1643 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1644 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1645 do_data_tag)) {
1646 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1647 brq->sbc.arg = brq->data.blocks |
1648 (do_rel_wr ? (1 << 31) : 0) |
1649 (do_data_tag ? (1 << 29) : 0);
1650 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1651 brq->mrq.sbc = &brq->sbc;
1652 }
1653}
1654
1655#define MMC_MAX_RETRIES 5
1656#define MMC_DATA_RETRIES 2
1657#define MMC_NO_RETRIES (MMC_MAX_RETRIES + 1)
1658
1659static int mmc_blk_send_stop(struct mmc_card *card, unsigned int timeout)
1660{
1661 struct mmc_command cmd = {
1662 .opcode = MMC_STOP_TRANSMISSION,
1663 .flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC,
1664 /* Some hosts wait for busy anyway, so provide a busy timeout */
1665 .busy_timeout = timeout,
1666 };
1667
1668 return mmc_wait_for_cmd(card->host, &cmd, 5);
1669}
1670
1671static int mmc_blk_fix_state(struct mmc_card *card, struct request *req)
1672{
1673 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1674 struct mmc_blk_request *brq = &mqrq->brq;
1675 unsigned int timeout = mmc_blk_data_timeout_ms(card->host, &brq->data);
1676 int err;
1677
1678 mmc_retune_hold_now(card->host);
1679
1680 mmc_blk_send_stop(card, timeout);
1681
1682 err = mmc_poll_for_busy(card, timeout, false, MMC_BUSY_IO);
1683
1684 mmc_retune_release(card->host);
1685
1686 return err;
1687}
1688
1689#define MMC_READ_SINGLE_RETRIES 2
1690
1691/* Single (native) sector read during recovery */
1692static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
1693{
1694 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1695 struct mmc_request *mrq = &mqrq->brq.mrq;
1696 struct mmc_card *card = mq->card;
1697 struct mmc_host *host = card->host;
1698 blk_status_t error = BLK_STS_OK;
1699 size_t bytes_per_read = queue_physical_block_size(mq->queue);
1700
1701 do {
1702 u32 status;
1703 int err;
1704 int retries = 0;
1705
1706 while (retries++ <= MMC_READ_SINGLE_RETRIES) {
1707 mmc_blk_rw_rq_prep(mqrq, card, 1, mq);
1708
1709 mmc_wait_for_req(host, mrq);
1710
1711 err = mmc_send_status(card, &status);
1712 if (err)
1713 goto error_exit;
1714
1715 if (!mmc_host_is_spi(host) &&
1716 !mmc_ready_for_data(status)) {
1717 err = mmc_blk_fix_state(card, req);
1718 if (err)
1719 goto error_exit;
1720 }
1721
1722 if (!mrq->cmd->error)
1723 break;
1724 }
1725
1726 if (mrq->cmd->error ||
1727 mrq->data->error ||
1728 (!mmc_host_is_spi(host) &&
1729 (mrq->cmd->resp[0] & CMD_ERRORS || status & CMD_ERRORS)))
1730 error = BLK_STS_IOERR;
1731 else
1732 error = BLK_STS_OK;
1733
1734 } while (blk_update_request(req, error, bytes_per_read));
1735
1736 return;
1737
1738error_exit:
1739 mrq->data->bytes_xfered = 0;
1740 blk_update_request(req, BLK_STS_IOERR, bytes_per_read);
1741 /* Let it try the remaining request again */
1742 if (mqrq->retries > MMC_MAX_RETRIES - 1)
1743 mqrq->retries = MMC_MAX_RETRIES - 1;
1744}
1745
1746static inline bool mmc_blk_oor_valid(struct mmc_blk_request *brq)
1747{
1748 return !!brq->mrq.sbc;
1749}
1750
1751static inline u32 mmc_blk_stop_err_bits(struct mmc_blk_request *brq)
1752{
1753 return mmc_blk_oor_valid(brq) ? CMD_ERRORS : CMD_ERRORS_EXCL_OOR;
1754}
1755
1756/*
1757 * Check for errors the host controller driver might not have seen such as
1758 * response mode errors or invalid card state.
1759 */
1760static bool mmc_blk_status_error(struct request *req, u32 status)
1761{
1762 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1763 struct mmc_blk_request *brq = &mqrq->brq;
1764 struct mmc_queue *mq = req->q->queuedata;
1765 u32 stop_err_bits;
1766
1767 if (mmc_host_is_spi(mq->card->host))
1768 return false;
1769
1770 stop_err_bits = mmc_blk_stop_err_bits(brq);
1771
1772 return brq->cmd.resp[0] & CMD_ERRORS ||
1773 brq->stop.resp[0] & stop_err_bits ||
1774 status & stop_err_bits ||
1775 (rq_data_dir(req) == WRITE && !mmc_ready_for_data(status));
1776}
1777
1778static inline bool mmc_blk_cmd_started(struct mmc_blk_request *brq)
1779{
1780 return !brq->sbc.error && !brq->cmd.error &&
1781 !(brq->cmd.resp[0] & CMD_ERRORS);
1782}
1783
1784/*
1785 * Requests are completed by mmc_blk_mq_complete_rq() which sets simple
1786 * policy:
1787 * 1. A request that has transferred at least some data is considered
1788 * successful and will be requeued if there is remaining data to
1789 * transfer.
1790 * 2. Otherwise the number of retries is incremented and the request
1791 * will be requeued if there are remaining retries.
1792 * 3. Otherwise the request will be errored out.
1793 * That means mmc_blk_mq_complete_rq() is controlled by bytes_xfered and
1794 * mqrq->retries. So there are only 4 possible actions here:
1795 * 1. do not accept the bytes_xfered value i.e. set it to zero
1796 * 2. change mqrq->retries to determine the number of retries
1797 * 3. try to reset the card
1798 * 4. read one sector at a time
1799 */
1800static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req)
1801{
1802 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1803 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1804 struct mmc_blk_request *brq = &mqrq->brq;
1805 struct mmc_blk_data *md = mq->blkdata;
1806 struct mmc_card *card = mq->card;
1807 u32 status;
1808 u32 blocks;
1809 int err;
1810
1811 /*
1812 * Some errors the host driver might not have seen. Set the number of
1813 * bytes transferred to zero in that case.
1814 */
1815 err = __mmc_send_status(card, &status, 0);
1816 if (err || mmc_blk_status_error(req, status))
1817 brq->data.bytes_xfered = 0;
1818
1819 mmc_retune_release(card->host);
1820
1821 /*
1822 * Try again to get the status. This also provides an opportunity for
1823 * re-tuning.
1824 */
1825 if (err)
1826 err = __mmc_send_status(card, &status, 0);
1827
1828 /*
1829 * Nothing more to do after the number of bytes transferred has been
1830 * updated and there is no card.
1831 */
1832 if (err && mmc_detect_card_removed(card->host))
1833 return;
1834
1835 /* Try to get back to "tran" state */
1836 if (!mmc_host_is_spi(mq->card->host) &&
1837 (err || !mmc_ready_for_data(status)))
1838 err = mmc_blk_fix_state(mq->card, req);
1839
1840 /*
1841 * Special case for SD cards where the card might record the number of
1842 * blocks written.
1843 */
1844 if (!err && mmc_blk_cmd_started(brq) && mmc_card_sd(card) &&
1845 rq_data_dir(req) == WRITE) {
1846 if (mmc_sd_num_wr_blocks(card, &blocks))
1847 brq->data.bytes_xfered = 0;
1848 else
1849 brq->data.bytes_xfered = blocks << 9;
1850 }
1851
1852 /* Reset if the card is in a bad state */
1853 if (!mmc_host_is_spi(mq->card->host) &&
1854 err && mmc_blk_reset(md, card->host, type)) {
1855 pr_err("%s: recovery failed!\n", req->q->disk->disk_name);
1856 mqrq->retries = MMC_NO_RETRIES;
1857 return;
1858 }
1859
1860 /*
1861 * If anything was done, just return and if there is anything remaining
1862 * on the request it will get requeued.
1863 */
1864 if (brq->data.bytes_xfered)
1865 return;
1866
1867 /* Reset before last retry */
1868 if (mqrq->retries + 1 == MMC_MAX_RETRIES &&
1869 mmc_blk_reset(md, card->host, type))
1870 return;
1871
1872 /* Command errors fail fast, so use all MMC_MAX_RETRIES */
1873 if (brq->sbc.error || brq->cmd.error)
1874 return;
1875
1876 /* Reduce the remaining retries for data errors */
1877 if (mqrq->retries < MMC_MAX_RETRIES - MMC_DATA_RETRIES) {
1878 mqrq->retries = MMC_MAX_RETRIES - MMC_DATA_RETRIES;
1879 return;
1880 }
1881
1882 if (rq_data_dir(req) == READ && brq->data.blocks >
1883 queue_physical_block_size(mq->queue) >> 9) {
1884 /* Read one (native) sector at a time */
1885 mmc_blk_read_single(mq, req);
1886 return;
1887 }
1888}
1889
1890static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq)
1891{
1892 mmc_blk_eval_resp_error(brq);
1893
1894 return brq->sbc.error || brq->cmd.error || brq->stop.error ||
1895 brq->data.error || brq->cmd.resp[0] & CMD_ERRORS;
1896}
1897
1898static int mmc_spi_err_check(struct mmc_card *card)
1899{
1900 u32 status = 0;
1901 int err;
1902
1903 /*
1904 * SPI does not have a TRAN state we have to wait on, instead the
1905 * card is ready again when it no longer holds the line LOW.
1906 * We still have to ensure two things here before we know the write
1907 * was successful:
1908 * 1. The card has not disconnected during busy and we actually read our
1909 * own pull-up, thinking it was still connected, so ensure it
1910 * still responds.
1911 * 2. Check for any error bits, in particular R1_SPI_IDLE to catch a
1912 * just reconnected card after being disconnected during busy.
1913 */
1914 err = __mmc_send_status(card, &status, 0);
1915 if (err)
1916 return err;
1917 /* All R1 and R2 bits of SPI are errors in our case */
1918 if (status)
1919 return -EIO;
1920 return 0;
1921}
1922
1923static int mmc_blk_busy_cb(void *cb_data, bool *busy)
1924{
1925 struct mmc_blk_busy_data *data = cb_data;
1926 u32 status = 0;
1927 int err;
1928
1929 err = mmc_send_status(data->card, &status);
1930 if (err)
1931 return err;
1932
1933 /* Accumulate response error bits. */
1934 data->status |= status;
1935
1936 *busy = !mmc_ready_for_data(status);
1937 return 0;
1938}
1939
1940static int mmc_blk_card_busy(struct mmc_card *card, struct request *req)
1941{
1942 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1943 struct mmc_blk_busy_data cb_data;
1944 int err;
1945
1946 if (rq_data_dir(req) == READ)
1947 return 0;
1948
1949 if (mmc_host_is_spi(card->host)) {
1950 err = mmc_spi_err_check(card);
1951 if (err)
1952 mqrq->brq.data.bytes_xfered = 0;
1953 return err;
1954 }
1955
1956 cb_data.card = card;
1957 cb_data.status = 0;
1958 err = __mmc_poll_for_busy(card->host, 0, MMC_BLK_TIMEOUT_MS,
1959 &mmc_blk_busy_cb, &cb_data);
1960
1961 /*
1962 * Do not assume data transferred correctly if there are any error bits
1963 * set.
1964 */
1965 if (cb_data.status & mmc_blk_stop_err_bits(&mqrq->brq)) {
1966 mqrq->brq.data.bytes_xfered = 0;
1967 err = err ? err : -EIO;
1968 }
1969
1970 /* Copy the exception bit so it will be seen later on */
1971 if (mmc_card_mmc(card) && cb_data.status & R1_EXCEPTION_EVENT)
1972 mqrq->brq.cmd.resp[0] |= R1_EXCEPTION_EVENT;
1973
1974 return err;
1975}
1976
1977static inline void mmc_blk_rw_reset_success(struct mmc_queue *mq,
1978 struct request *req)
1979{
1980 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1981
1982 mmc_blk_reset_success(mq->blkdata, type);
1983}
1984
1985static void mmc_blk_mq_complete_rq(struct mmc_queue *mq, struct request *req)
1986{
1987 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1988 unsigned int nr_bytes = mqrq->brq.data.bytes_xfered;
1989
1990 if (nr_bytes) {
1991 if (blk_update_request(req, BLK_STS_OK, nr_bytes))
1992 blk_mq_requeue_request(req, true);
1993 else
1994 __blk_mq_end_request(req, BLK_STS_OK);
1995 } else if (!blk_rq_bytes(req)) {
1996 __blk_mq_end_request(req, BLK_STS_IOERR);
1997 } else if (mqrq->retries++ < MMC_MAX_RETRIES) {
1998 blk_mq_requeue_request(req, true);
1999 } else {
2000 if (mmc_card_removed(mq->card))
2001 req->rq_flags |= RQF_QUIET;
2002 blk_mq_end_request(req, BLK_STS_IOERR);
2003 }
2004}
2005
2006static bool mmc_blk_urgent_bkops_needed(struct mmc_queue *mq,
2007 struct mmc_queue_req *mqrq)
2008{
2009 return mmc_card_mmc(mq->card) && !mmc_host_is_spi(mq->card->host) &&
2010 (mqrq->brq.cmd.resp[0] & R1_EXCEPTION_EVENT ||
2011 mqrq->brq.stop.resp[0] & R1_EXCEPTION_EVENT);
2012}
2013
2014static void mmc_blk_urgent_bkops(struct mmc_queue *mq,
2015 struct mmc_queue_req *mqrq)
2016{
2017 if (mmc_blk_urgent_bkops_needed(mq, mqrq))
2018 mmc_run_bkops(mq->card);
2019}
2020
2021static void mmc_blk_hsq_req_done(struct mmc_request *mrq)
2022{
2023 struct mmc_queue_req *mqrq =
2024 container_of(mrq, struct mmc_queue_req, brq.mrq);
2025 struct request *req = mmc_queue_req_to_req(mqrq);
2026 struct request_queue *q = req->q;
2027 struct mmc_queue *mq = q->queuedata;
2028 struct mmc_host *host = mq->card->host;
2029 unsigned long flags;
2030
2031 if (mmc_blk_rq_error(&mqrq->brq) ||
2032 mmc_blk_urgent_bkops_needed(mq, mqrq)) {
2033 spin_lock_irqsave(&mq->lock, flags);
2034 mq->recovery_needed = true;
2035 mq->recovery_req = req;
2036 spin_unlock_irqrestore(&mq->lock, flags);
2037
2038 host->cqe_ops->cqe_recovery_start(host);
2039
2040 schedule_work(&mq->recovery_work);
2041 return;
2042 }
2043
2044 mmc_blk_rw_reset_success(mq, req);
2045
2046 /*
2047 * Block layer timeouts race with completions which means the normal
2048 * completion path cannot be used during recovery.
2049 */
2050 if (mq->in_recovery)
2051 mmc_blk_cqe_complete_rq(mq, req);
2052 else if (likely(!blk_should_fake_timeout(req->q)))
2053 blk_mq_complete_request(req);
2054}
2055
2056void mmc_blk_mq_complete(struct request *req)
2057{
2058 struct mmc_queue *mq = req->q->queuedata;
2059 struct mmc_host *host = mq->card->host;
2060
2061 if (host->cqe_enabled)
2062 mmc_blk_cqe_complete_rq(mq, req);
2063 else if (likely(!blk_should_fake_timeout(req->q)))
2064 mmc_blk_mq_complete_rq(mq, req);
2065}
2066
2067static void mmc_blk_mq_poll_completion(struct mmc_queue *mq,
2068 struct request *req)
2069{
2070 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2071 struct mmc_host *host = mq->card->host;
2072
2073 if (mmc_blk_rq_error(&mqrq->brq) ||
2074 mmc_blk_card_busy(mq->card, req)) {
2075 mmc_blk_mq_rw_recovery(mq, req);
2076 } else {
2077 mmc_blk_rw_reset_success(mq, req);
2078 mmc_retune_release(host);
2079 }
2080
2081 mmc_blk_urgent_bkops(mq, mqrq);
2082}
2083
2084static void mmc_blk_mq_dec_in_flight(struct mmc_queue *mq, struct request *req)
2085{
2086 unsigned long flags;
2087 bool put_card;
2088
2089 spin_lock_irqsave(&mq->lock, flags);
2090
2091 mq->in_flight[mmc_issue_type(mq, req)] -= 1;
2092
2093 put_card = (mmc_tot_in_flight(mq) == 0);
2094
2095 spin_unlock_irqrestore(&mq->lock, flags);
2096
2097 if (put_card)
2098 mmc_put_card(mq->card, &mq->ctx);
2099}
2100
2101static void mmc_blk_mq_post_req(struct mmc_queue *mq, struct request *req,
2102 bool can_sleep)
2103{
2104 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2105 struct mmc_request *mrq = &mqrq->brq.mrq;
2106 struct mmc_host *host = mq->card->host;
2107
2108 mmc_post_req(host, mrq, 0);
2109
2110 /*
2111 * Block layer timeouts race with completions which means the normal
2112 * completion path cannot be used during recovery.
2113 */
2114 if (mq->in_recovery) {
2115 mmc_blk_mq_complete_rq(mq, req);
2116 } else if (likely(!blk_should_fake_timeout(req->q))) {
2117 if (can_sleep)
2118 blk_mq_complete_request_direct(req, mmc_blk_mq_complete);
2119 else
2120 blk_mq_complete_request(req);
2121 }
2122
2123 mmc_blk_mq_dec_in_flight(mq, req);
2124}
2125
2126void mmc_blk_mq_recovery(struct mmc_queue *mq)
2127{
2128 struct request *req = mq->recovery_req;
2129 struct mmc_host *host = mq->card->host;
2130 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2131
2132 mq->recovery_req = NULL;
2133 mq->rw_wait = false;
2134
2135 if (mmc_blk_rq_error(&mqrq->brq)) {
2136 mmc_retune_hold_now(host);
2137 mmc_blk_mq_rw_recovery(mq, req);
2138 }
2139
2140 mmc_blk_urgent_bkops(mq, mqrq);
2141
2142 mmc_blk_mq_post_req(mq, req, true);
2143}
2144
2145static void mmc_blk_mq_complete_prev_req(struct mmc_queue *mq,
2146 struct request **prev_req)
2147{
2148 if (mmc_host_done_complete(mq->card->host))
2149 return;
2150
2151 mutex_lock(&mq->complete_lock);
2152
2153 if (!mq->complete_req)
2154 goto out_unlock;
2155
2156 mmc_blk_mq_poll_completion(mq, mq->complete_req);
2157
2158 if (prev_req)
2159 *prev_req = mq->complete_req;
2160 else
2161 mmc_blk_mq_post_req(mq, mq->complete_req, true);
2162
2163 mq->complete_req = NULL;
2164
2165out_unlock:
2166 mutex_unlock(&mq->complete_lock);
2167}
2168
2169void mmc_blk_mq_complete_work(struct work_struct *work)
2170{
2171 struct mmc_queue *mq = container_of(work, struct mmc_queue,
2172 complete_work);
2173
2174 mmc_blk_mq_complete_prev_req(mq, NULL);
2175}
2176
2177static void mmc_blk_mq_req_done(struct mmc_request *mrq)
2178{
2179 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
2180 brq.mrq);
2181 struct request *req = mmc_queue_req_to_req(mqrq);
2182 struct request_queue *q = req->q;
2183 struct mmc_queue *mq = q->queuedata;
2184 struct mmc_host *host = mq->card->host;
2185 unsigned long flags;
2186
2187 if (!mmc_host_done_complete(host)) {
2188 bool waiting;
2189
2190 /*
2191 * We cannot complete the request in this context, so record
2192 * that there is a request to complete, and that a following
2193 * request does not need to wait (although it does need to
2194 * complete complete_req first).
2195 */
2196 spin_lock_irqsave(&mq->lock, flags);
2197 mq->complete_req = req;
2198 mq->rw_wait = false;
2199 waiting = mq->waiting;
2200 spin_unlock_irqrestore(&mq->lock, flags);
2201
2202 /*
2203 * If 'waiting' then the waiting task will complete this
2204 * request, otherwise queue a work to do it. Note that
2205 * complete_work may still race with the dispatch of a following
2206 * request.
2207 */
2208 if (waiting)
2209 wake_up(&mq->wait);
2210 else
2211 queue_work(mq->card->complete_wq, &mq->complete_work);
2212
2213 return;
2214 }
2215
2216 /* Take the recovery path for errors or urgent background operations */
2217 if (mmc_blk_rq_error(&mqrq->brq) ||
2218 mmc_blk_urgent_bkops_needed(mq, mqrq)) {
2219 spin_lock_irqsave(&mq->lock, flags);
2220 mq->recovery_needed = true;
2221 mq->recovery_req = req;
2222 spin_unlock_irqrestore(&mq->lock, flags);
2223 wake_up(&mq->wait);
2224 schedule_work(&mq->recovery_work);
2225 return;
2226 }
2227
2228 mmc_blk_rw_reset_success(mq, req);
2229
2230 mq->rw_wait = false;
2231 wake_up(&mq->wait);
2232
2233 /* context unknown */
2234 mmc_blk_mq_post_req(mq, req, false);
2235}
2236
2237static bool mmc_blk_rw_wait_cond(struct mmc_queue *mq, int *err)
2238{
2239 unsigned long flags;
2240 bool done;
2241
2242 /*
2243 * Wait while there is another request in progress, but not if recovery
2244 * is needed. Also indicate whether there is a request waiting to start.
2245 */
2246 spin_lock_irqsave(&mq->lock, flags);
2247 if (mq->recovery_needed) {
2248 *err = -EBUSY;
2249 done = true;
2250 } else {
2251 done = !mq->rw_wait;
2252 }
2253 mq->waiting = !done;
2254 spin_unlock_irqrestore(&mq->lock, flags);
2255
2256 return done;
2257}
2258
2259static int mmc_blk_rw_wait(struct mmc_queue *mq, struct request **prev_req)
2260{
2261 int err = 0;
2262
2263 wait_event(mq->wait, mmc_blk_rw_wait_cond(mq, &err));
2264
2265 /* Always complete the previous request if there is one */
2266 mmc_blk_mq_complete_prev_req(mq, prev_req);
2267
2268 return err;
2269}
2270
2271static int mmc_blk_mq_issue_rw_rq(struct mmc_queue *mq,
2272 struct request *req)
2273{
2274 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2275 struct mmc_host *host = mq->card->host;
2276 struct request *prev_req = NULL;
2277 int err = 0;
2278
2279 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
2280
2281 mqrq->brq.mrq.done = mmc_blk_mq_req_done;
2282
2283 mmc_pre_req(host, &mqrq->brq.mrq);
2284
2285 err = mmc_blk_rw_wait(mq, &prev_req);
2286 if (err)
2287 goto out_post_req;
2288
2289 mq->rw_wait = true;
2290
2291 err = mmc_start_request(host, &mqrq->brq.mrq);
2292
2293 if (prev_req)
2294 mmc_blk_mq_post_req(mq, prev_req, true);
2295
2296 if (err)
2297 mq->rw_wait = false;
2298
2299 /* Release re-tuning here where there is no synchronization required */
2300 if (err || mmc_host_done_complete(host))
2301 mmc_retune_release(host);
2302
2303out_post_req:
2304 if (err)
2305 mmc_post_req(host, &mqrq->brq.mrq, err);
2306
2307 return err;
2308}
2309
2310static int mmc_blk_wait_for_idle(struct mmc_queue *mq, struct mmc_host *host)
2311{
2312 if (host->cqe_enabled)
2313 return host->cqe_ops->cqe_wait_for_idle(host);
2314
2315 return mmc_blk_rw_wait(mq, NULL);
2316}
2317
2318enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req)
2319{
2320 struct mmc_blk_data *md = mq->blkdata;
2321 struct mmc_card *card = md->queue.card;
2322 struct mmc_host *host = card->host;
2323 int ret;
2324
2325 ret = mmc_blk_part_switch(card, md->part_type);
2326 if (ret)
2327 return MMC_REQ_FAILED_TO_START;
2328
2329 switch (mmc_issue_type(mq, req)) {
2330 case MMC_ISSUE_SYNC:
2331 ret = mmc_blk_wait_for_idle(mq, host);
2332 if (ret)
2333 return MMC_REQ_BUSY;
2334 switch (req_op(req)) {
2335 case REQ_OP_DRV_IN:
2336 case REQ_OP_DRV_OUT:
2337 mmc_blk_issue_drv_op(mq, req);
2338 break;
2339 case REQ_OP_DISCARD:
2340 mmc_blk_issue_discard_rq(mq, req);
2341 break;
2342 case REQ_OP_SECURE_ERASE:
2343 mmc_blk_issue_secdiscard_rq(mq, req);
2344 break;
2345 case REQ_OP_WRITE_ZEROES:
2346 mmc_blk_issue_trim_rq(mq, req);
2347 break;
2348 case REQ_OP_FLUSH:
2349 mmc_blk_issue_flush(mq, req);
2350 break;
2351 default:
2352 WARN_ON_ONCE(1);
2353 return MMC_REQ_FAILED_TO_START;
2354 }
2355 return MMC_REQ_FINISHED;
2356 case MMC_ISSUE_DCMD:
2357 case MMC_ISSUE_ASYNC:
2358 switch (req_op(req)) {
2359 case REQ_OP_FLUSH:
2360 if (!mmc_cache_enabled(host)) {
2361 blk_mq_end_request(req, BLK_STS_OK);
2362 return MMC_REQ_FINISHED;
2363 }
2364 ret = mmc_blk_cqe_issue_flush(mq, req);
2365 break;
2366 case REQ_OP_READ:
2367 case REQ_OP_WRITE:
2368 if (host->cqe_enabled)
2369 ret = mmc_blk_cqe_issue_rw_rq(mq, req);
2370 else
2371 ret = mmc_blk_mq_issue_rw_rq(mq, req);
2372 break;
2373 default:
2374 WARN_ON_ONCE(1);
2375 ret = -EINVAL;
2376 }
2377 if (!ret)
2378 return MMC_REQ_STARTED;
2379 return ret == -EBUSY ? MMC_REQ_BUSY : MMC_REQ_FAILED_TO_START;
2380 default:
2381 WARN_ON_ONCE(1);
2382 return MMC_REQ_FAILED_TO_START;
2383 }
2384}
2385
2386static inline int mmc_blk_readonly(struct mmc_card *card)
2387{
2388 return mmc_card_readonly(card) ||
2389 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2390}
2391
2392static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2393 struct device *parent,
2394 sector_t size,
2395 bool default_ro,
2396 const char *subname,
2397 int area_type,
2398 unsigned int part_type)
2399{
2400 struct mmc_blk_data *md;
2401 int devidx, ret;
2402 char cap_str[10];
2403 bool cache_enabled = false;
2404 bool fua_enabled = false;
2405
2406 devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL);
2407 if (devidx < 0) {
2408 /*
2409 * We get -ENOSPC because there are no more any available
2410 * devidx. The reason may be that, either userspace haven't yet
2411 * unmounted the partitions, which postpones mmc_blk_release()
2412 * from being called, or the device has more partitions than
2413 * what we support.
2414 */
2415 if (devidx == -ENOSPC)
2416 dev_err(mmc_dev(card->host),
2417 "no more device IDs available\n");
2418
2419 return ERR_PTR(devidx);
2420 }
2421
2422 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2423 if (!md) {
2424 ret = -ENOMEM;
2425 goto out;
2426 }
2427
2428 md->area_type = area_type;
2429
2430 /*
2431 * Set the read-only status based on the supported commands
2432 * and the write protect switch.
2433 */
2434 md->read_only = mmc_blk_readonly(card);
2435
2436 md->disk = mmc_init_queue(&md->queue, card);
2437 if (IS_ERR(md->disk)) {
2438 ret = PTR_ERR(md->disk);
2439 goto err_kfree;
2440 }
2441
2442 INIT_LIST_HEAD(&md->part);
2443 INIT_LIST_HEAD(&md->rpmbs);
2444 kref_init(&md->kref);
2445
2446 md->queue.blkdata = md;
2447 md->part_type = part_type;
2448
2449 md->disk->major = MMC_BLOCK_MAJOR;
2450 md->disk->minors = perdev_minors;
2451 md->disk->first_minor = devidx * perdev_minors;
2452 md->disk->fops = &mmc_bdops;
2453 md->disk->private_data = md;
2454 md->parent = parent;
2455 set_disk_ro(md->disk, md->read_only || default_ro);
2456 if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2457 md->disk->flags |= GENHD_FL_NO_PART;
2458
2459 /*
2460 * As discussed on lkml, GENHD_FL_REMOVABLE should:
2461 *
2462 * - be set for removable media with permanent block devices
2463 * - be unset for removable block devices with permanent media
2464 *
2465 * Since MMC block devices clearly fall under the second
2466 * case, we do not set GENHD_FL_REMOVABLE. Userspace
2467 * should use the block device creation/destruction hotplug
2468 * messages to tell when the card is present.
2469 */
2470
2471 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2472 "mmcblk%u%s", card->host->index, subname ? subname : "");
2473
2474 set_capacity(md->disk, size);
2475
2476 if (mmc_host_cmd23(card->host)) {
2477 if ((mmc_card_mmc(card) &&
2478 card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
2479 (mmc_card_sd(card) &&
2480 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2481 md->flags |= MMC_BLK_CMD23;
2482 }
2483
2484 if (md->flags & MMC_BLK_CMD23 &&
2485 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2486 card->ext_csd.rel_sectors)) {
2487 md->flags |= MMC_BLK_REL_WR;
2488 fua_enabled = true;
2489 cache_enabled = true;
2490 }
2491 if (mmc_cache_enabled(card->host))
2492 cache_enabled = true;
2493
2494 blk_queue_write_cache(md->queue.queue, cache_enabled, fua_enabled);
2495
2496 string_get_size((u64)size, 512, STRING_UNITS_2,
2497 cap_str, sizeof(cap_str));
2498 pr_info("%s: %s %s %s %s\n",
2499 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2500 cap_str, md->read_only ? "(ro)" : "");
2501
2502 /* used in ->open, must be set before add_disk: */
2503 if (area_type == MMC_BLK_DATA_AREA_MAIN)
2504 dev_set_drvdata(&card->dev, md);
2505 ret = device_add_disk(md->parent, md->disk, mmc_disk_attr_groups);
2506 if (ret)
2507 goto err_put_disk;
2508 return md;
2509
2510 err_put_disk:
2511 put_disk(md->disk);
2512 blk_mq_free_tag_set(&md->queue.tag_set);
2513 err_kfree:
2514 kfree(md);
2515 out:
2516 ida_simple_remove(&mmc_blk_ida, devidx);
2517 return ERR_PTR(ret);
2518}
2519
2520static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2521{
2522 sector_t size;
2523
2524 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2525 /*
2526 * The EXT_CSD sector count is in number or 512 byte
2527 * sectors.
2528 */
2529 size = card->ext_csd.sectors;
2530 } else {
2531 /*
2532 * The CSD capacity field is in units of read_blkbits.
2533 * set_capacity takes units of 512 bytes.
2534 */
2535 size = (typeof(sector_t))card->csd.capacity
2536 << (card->csd.read_blkbits - 9);
2537 }
2538
2539 return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2540 MMC_BLK_DATA_AREA_MAIN, 0);
2541}
2542
2543static int mmc_blk_alloc_part(struct mmc_card *card,
2544 struct mmc_blk_data *md,
2545 unsigned int part_type,
2546 sector_t size,
2547 bool default_ro,
2548 const char *subname,
2549 int area_type)
2550{
2551 struct mmc_blk_data *part_md;
2552
2553 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2554 subname, area_type, part_type);
2555 if (IS_ERR(part_md))
2556 return PTR_ERR(part_md);
2557 list_add(&part_md->part, &md->part);
2558
2559 return 0;
2560}
2561
2562/**
2563 * mmc_rpmb_ioctl() - ioctl handler for the RPMB chardev
2564 * @filp: the character device file
2565 * @cmd: the ioctl() command
2566 * @arg: the argument from userspace
2567 *
2568 * This will essentially just redirect the ioctl()s coming in over to
2569 * the main block device spawning the RPMB character device.
2570 */
2571static long mmc_rpmb_ioctl(struct file *filp, unsigned int cmd,
2572 unsigned long arg)
2573{
2574 struct mmc_rpmb_data *rpmb = filp->private_data;
2575 int ret;
2576
2577 switch (cmd) {
2578 case MMC_IOC_CMD:
2579 ret = mmc_blk_ioctl_cmd(rpmb->md,
2580 (struct mmc_ioc_cmd __user *)arg,
2581 rpmb);
2582 break;
2583 case MMC_IOC_MULTI_CMD:
2584 ret = mmc_blk_ioctl_multi_cmd(rpmb->md,
2585 (struct mmc_ioc_multi_cmd __user *)arg,
2586 rpmb);
2587 break;
2588 default:
2589 ret = -EINVAL;
2590 break;
2591 }
2592
2593 return ret;
2594}
2595
2596#ifdef CONFIG_COMPAT
2597static long mmc_rpmb_ioctl_compat(struct file *filp, unsigned int cmd,
2598 unsigned long arg)
2599{
2600 return mmc_rpmb_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
2601}
2602#endif
2603
2604static int mmc_rpmb_chrdev_open(struct inode *inode, struct file *filp)
2605{
2606 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2607 struct mmc_rpmb_data, chrdev);
2608
2609 get_device(&rpmb->dev);
2610 filp->private_data = rpmb;
2611 mmc_blk_get(rpmb->md->disk);
2612
2613 return nonseekable_open(inode, filp);
2614}
2615
2616static int mmc_rpmb_chrdev_release(struct inode *inode, struct file *filp)
2617{
2618 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2619 struct mmc_rpmb_data, chrdev);
2620
2621 mmc_blk_put(rpmb->md);
2622 put_device(&rpmb->dev);
2623
2624 return 0;
2625}
2626
2627static const struct file_operations mmc_rpmb_fileops = {
2628 .release = mmc_rpmb_chrdev_release,
2629 .open = mmc_rpmb_chrdev_open,
2630 .owner = THIS_MODULE,
2631 .llseek = no_llseek,
2632 .unlocked_ioctl = mmc_rpmb_ioctl,
2633#ifdef CONFIG_COMPAT
2634 .compat_ioctl = mmc_rpmb_ioctl_compat,
2635#endif
2636};
2637
2638static void mmc_blk_rpmb_device_release(struct device *dev)
2639{
2640 struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev);
2641
2642 ida_simple_remove(&mmc_rpmb_ida, rpmb->id);
2643 kfree(rpmb);
2644}
2645
2646static int mmc_blk_alloc_rpmb_part(struct mmc_card *card,
2647 struct mmc_blk_data *md,
2648 unsigned int part_index,
2649 sector_t size,
2650 const char *subname)
2651{
2652 int devidx, ret;
2653 char rpmb_name[DISK_NAME_LEN];
2654 char cap_str[10];
2655 struct mmc_rpmb_data *rpmb;
2656
2657 /* This creates the minor number for the RPMB char device */
2658 devidx = ida_simple_get(&mmc_rpmb_ida, 0, max_devices, GFP_KERNEL);
2659 if (devidx < 0)
2660 return devidx;
2661
2662 rpmb = kzalloc(sizeof(*rpmb), GFP_KERNEL);
2663 if (!rpmb) {
2664 ida_simple_remove(&mmc_rpmb_ida, devidx);
2665 return -ENOMEM;
2666 }
2667
2668 snprintf(rpmb_name, sizeof(rpmb_name),
2669 "mmcblk%u%s", card->host->index, subname ? subname : "");
2670
2671 rpmb->id = devidx;
2672 rpmb->part_index = part_index;
2673 rpmb->dev.init_name = rpmb_name;
2674 rpmb->dev.bus = &mmc_rpmb_bus_type;
2675 rpmb->dev.devt = MKDEV(MAJOR(mmc_rpmb_devt), rpmb->id);
2676 rpmb->dev.parent = &card->dev;
2677 rpmb->dev.release = mmc_blk_rpmb_device_release;
2678 device_initialize(&rpmb->dev);
2679 dev_set_drvdata(&rpmb->dev, rpmb);
2680 rpmb->md = md;
2681
2682 cdev_init(&rpmb->chrdev, &mmc_rpmb_fileops);
2683 rpmb->chrdev.owner = THIS_MODULE;
2684 ret = cdev_device_add(&rpmb->chrdev, &rpmb->dev);
2685 if (ret) {
2686 pr_err("%s: could not add character device\n", rpmb_name);
2687 goto out_put_device;
2688 }
2689
2690 list_add(&rpmb->node, &md->rpmbs);
2691
2692 string_get_size((u64)size, 512, STRING_UNITS_2,
2693 cap_str, sizeof(cap_str));
2694
2695 pr_info("%s: %s %s %s, chardev (%d:%d)\n",
2696 rpmb_name, mmc_card_id(card), mmc_card_name(card), cap_str,
2697 MAJOR(mmc_rpmb_devt), rpmb->id);
2698
2699 return 0;
2700
2701out_put_device:
2702 put_device(&rpmb->dev);
2703 return ret;
2704}
2705
2706static void mmc_blk_remove_rpmb_part(struct mmc_rpmb_data *rpmb)
2707
2708{
2709 cdev_device_del(&rpmb->chrdev, &rpmb->dev);
2710 put_device(&rpmb->dev);
2711}
2712
2713/* MMC Physical partitions consist of two boot partitions and
2714 * up to four general purpose partitions.
2715 * For each partition enabled in EXT_CSD a block device will be allocatedi
2716 * to provide access to the partition.
2717 */
2718
2719static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2720{
2721 int idx, ret;
2722
2723 if (!mmc_card_mmc(card))
2724 return 0;
2725
2726 for (idx = 0; idx < card->nr_parts; idx++) {
2727 if (card->part[idx].area_type & MMC_BLK_DATA_AREA_RPMB) {
2728 /*
2729 * RPMB partitions does not provide block access, they
2730 * are only accessed using ioctl():s. Thus create
2731 * special RPMB block devices that do not have a
2732 * backing block queue for these.
2733 */
2734 ret = mmc_blk_alloc_rpmb_part(card, md,
2735 card->part[idx].part_cfg,
2736 card->part[idx].size >> 9,
2737 card->part[idx].name);
2738 if (ret)
2739 return ret;
2740 } else if (card->part[idx].size) {
2741 ret = mmc_blk_alloc_part(card, md,
2742 card->part[idx].part_cfg,
2743 card->part[idx].size >> 9,
2744 card->part[idx].force_ro,
2745 card->part[idx].name,
2746 card->part[idx].area_type);
2747 if (ret)
2748 return ret;
2749 }
2750 }
2751
2752 return 0;
2753}
2754
2755static void mmc_blk_remove_req(struct mmc_blk_data *md)
2756{
2757 /*
2758 * Flush remaining requests and free queues. It is freeing the queue
2759 * that stops new requests from being accepted.
2760 */
2761 del_gendisk(md->disk);
2762 mmc_cleanup_queue(&md->queue);
2763 mmc_blk_put(md);
2764}
2765
2766static void mmc_blk_remove_parts(struct mmc_card *card,
2767 struct mmc_blk_data *md)
2768{
2769 struct list_head *pos, *q;
2770 struct mmc_blk_data *part_md;
2771 struct mmc_rpmb_data *rpmb;
2772
2773 /* Remove RPMB partitions */
2774 list_for_each_safe(pos, q, &md->rpmbs) {
2775 rpmb = list_entry(pos, struct mmc_rpmb_data, node);
2776 list_del(pos);
2777 mmc_blk_remove_rpmb_part(rpmb);
2778 }
2779 /* Remove block partitions */
2780 list_for_each_safe(pos, q, &md->part) {
2781 part_md = list_entry(pos, struct mmc_blk_data, part);
2782 list_del(pos);
2783 mmc_blk_remove_req(part_md);
2784 }
2785}
2786
2787#ifdef CONFIG_DEBUG_FS
2788
2789static int mmc_dbg_card_status_get(void *data, u64 *val)
2790{
2791 struct mmc_card *card = data;
2792 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2793 struct mmc_queue *mq = &md->queue;
2794 struct request *req;
2795 int ret;
2796
2797 /* Ask the block layer about the card status */
2798 req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_IN, 0);
2799 if (IS_ERR(req))
2800 return PTR_ERR(req);
2801 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_CARD_STATUS;
2802 blk_execute_rq(req, false);
2803 ret = req_to_mmc_queue_req(req)->drv_op_result;
2804 if (ret >= 0) {
2805 *val = ret;
2806 ret = 0;
2807 }
2808 blk_mq_free_request(req);
2809
2810 return ret;
2811}
2812DEFINE_DEBUGFS_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
2813 NULL, "%08llx\n");
2814
2815/* That is two digits * 512 + 1 for newline */
2816#define EXT_CSD_STR_LEN 1025
2817
2818static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
2819{
2820 struct mmc_card *card = inode->i_private;
2821 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2822 struct mmc_queue *mq = &md->queue;
2823 struct request *req;
2824 char *buf;
2825 ssize_t n = 0;
2826 u8 *ext_csd;
2827 int err, i;
2828
2829 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
2830 if (!buf)
2831 return -ENOMEM;
2832
2833 /* Ask the block layer for the EXT CSD */
2834 req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_IN, 0);
2835 if (IS_ERR(req)) {
2836 err = PTR_ERR(req);
2837 goto out_free;
2838 }
2839 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_EXT_CSD;
2840 req_to_mmc_queue_req(req)->drv_op_data = &ext_csd;
2841 blk_execute_rq(req, false);
2842 err = req_to_mmc_queue_req(req)->drv_op_result;
2843 blk_mq_free_request(req);
2844 if (err) {
2845 pr_err("FAILED %d\n", err);
2846 goto out_free;
2847 }
2848
2849 for (i = 0; i < 512; i++)
2850 n += sprintf(buf + n, "%02x", ext_csd[i]);
2851 n += sprintf(buf + n, "\n");
2852
2853 if (n != EXT_CSD_STR_LEN) {
2854 err = -EINVAL;
2855 kfree(ext_csd);
2856 goto out_free;
2857 }
2858
2859 filp->private_data = buf;
2860 kfree(ext_csd);
2861 return 0;
2862
2863out_free:
2864 kfree(buf);
2865 return err;
2866}
2867
2868static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
2869 size_t cnt, loff_t *ppos)
2870{
2871 char *buf = filp->private_data;
2872
2873 return simple_read_from_buffer(ubuf, cnt, ppos,
2874 buf, EXT_CSD_STR_LEN);
2875}
2876
2877static int mmc_ext_csd_release(struct inode *inode, struct file *file)
2878{
2879 kfree(file->private_data);
2880 return 0;
2881}
2882
2883static const struct file_operations mmc_dbg_ext_csd_fops = {
2884 .open = mmc_ext_csd_open,
2885 .read = mmc_ext_csd_read,
2886 .release = mmc_ext_csd_release,
2887 .llseek = default_llseek,
2888};
2889
2890static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
2891{
2892 struct dentry *root;
2893
2894 if (!card->debugfs_root)
2895 return 0;
2896
2897 root = card->debugfs_root;
2898
2899 if (mmc_card_mmc(card) || mmc_card_sd(card)) {
2900 md->status_dentry =
2901 debugfs_create_file_unsafe("status", 0400, root,
2902 card,
2903 &mmc_dbg_card_status_fops);
2904 if (!md->status_dentry)
2905 return -EIO;
2906 }
2907
2908 if (mmc_card_mmc(card)) {
2909 md->ext_csd_dentry =
2910 debugfs_create_file("ext_csd", S_IRUSR, root, card,
2911 &mmc_dbg_ext_csd_fops);
2912 if (!md->ext_csd_dentry)
2913 return -EIO;
2914 }
2915
2916 return 0;
2917}
2918
2919static void mmc_blk_remove_debugfs(struct mmc_card *card,
2920 struct mmc_blk_data *md)
2921{
2922 if (!card->debugfs_root)
2923 return;
2924
2925 if (!IS_ERR_OR_NULL(md->status_dentry)) {
2926 debugfs_remove(md->status_dentry);
2927 md->status_dentry = NULL;
2928 }
2929
2930 if (!IS_ERR_OR_NULL(md->ext_csd_dentry)) {
2931 debugfs_remove(md->ext_csd_dentry);
2932 md->ext_csd_dentry = NULL;
2933 }
2934}
2935
2936#else
2937
2938static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
2939{
2940 return 0;
2941}
2942
2943static void mmc_blk_remove_debugfs(struct mmc_card *card,
2944 struct mmc_blk_data *md)
2945{
2946}
2947
2948#endif /* CONFIG_DEBUG_FS */
2949
2950static int mmc_blk_probe(struct mmc_card *card)
2951{
2952 struct mmc_blk_data *md;
2953 int ret = 0;
2954
2955 /*
2956 * Check that the card supports the command class(es) we need.
2957 */
2958 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2959 return -ENODEV;
2960
2961 mmc_fixup_device(card, mmc_blk_fixups);
2962
2963 card->complete_wq = alloc_workqueue("mmc_complete",
2964 WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
2965 if (!card->complete_wq) {
2966 pr_err("Failed to create mmc completion workqueue");
2967 return -ENOMEM;
2968 }
2969
2970 md = mmc_blk_alloc(card);
2971 if (IS_ERR(md)) {
2972 ret = PTR_ERR(md);
2973 goto out_free;
2974 }
2975
2976 ret = mmc_blk_alloc_parts(card, md);
2977 if (ret)
2978 goto out;
2979
2980 /* Add two debugfs entries */
2981 mmc_blk_add_debugfs(card, md);
2982
2983 pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2984 pm_runtime_use_autosuspend(&card->dev);
2985
2986 /*
2987 * Don't enable runtime PM for SD-combo cards here. Leave that
2988 * decision to be taken during the SDIO init sequence instead.
2989 */
2990 if (!mmc_card_sd_combo(card)) {
2991 pm_runtime_set_active(&card->dev);
2992 pm_runtime_enable(&card->dev);
2993 }
2994
2995 return 0;
2996
2997out:
2998 mmc_blk_remove_parts(card, md);
2999 mmc_blk_remove_req(md);
3000out_free:
3001 destroy_workqueue(card->complete_wq);
3002 return ret;
3003}
3004
3005static void mmc_blk_remove(struct mmc_card *card)
3006{
3007 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
3008
3009 mmc_blk_remove_debugfs(card, md);
3010 mmc_blk_remove_parts(card, md);
3011 pm_runtime_get_sync(&card->dev);
3012 if (md->part_curr != md->part_type) {
3013 mmc_claim_host(card->host);
3014 mmc_blk_part_switch(card, md->part_type);
3015 mmc_release_host(card->host);
3016 }
3017 if (!mmc_card_sd_combo(card))
3018 pm_runtime_disable(&card->dev);
3019 pm_runtime_put_noidle(&card->dev);
3020 mmc_blk_remove_req(md);
3021 dev_set_drvdata(&card->dev, NULL);
3022 destroy_workqueue(card->complete_wq);
3023}
3024
3025static int _mmc_blk_suspend(struct mmc_card *card)
3026{
3027 struct mmc_blk_data *part_md;
3028 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
3029
3030 if (md) {
3031 mmc_queue_suspend(&md->queue);
3032 list_for_each_entry(part_md, &md->part, part) {
3033 mmc_queue_suspend(&part_md->queue);
3034 }
3035 }
3036 return 0;
3037}
3038
3039static void mmc_blk_shutdown(struct mmc_card *card)
3040{
3041 _mmc_blk_suspend(card);
3042}
3043
3044#ifdef CONFIG_PM_SLEEP
3045static int mmc_blk_suspend(struct device *dev)
3046{
3047 struct mmc_card *card = mmc_dev_to_card(dev);
3048
3049 return _mmc_blk_suspend(card);
3050}
3051
3052static int mmc_blk_resume(struct device *dev)
3053{
3054 struct mmc_blk_data *part_md;
3055 struct mmc_blk_data *md = dev_get_drvdata(dev);
3056
3057 if (md) {
3058 /*
3059 * Resume involves the card going into idle state,
3060 * so current partition is always the main one.
3061 */
3062 md->part_curr = md->part_type;
3063 mmc_queue_resume(&md->queue);
3064 list_for_each_entry(part_md, &md->part, part) {
3065 mmc_queue_resume(&part_md->queue);
3066 }
3067 }
3068 return 0;
3069}
3070#endif
3071
3072static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
3073
3074static struct mmc_driver mmc_driver = {
3075 .drv = {
3076 .name = "mmcblk",
3077 .pm = &mmc_blk_pm_ops,
3078 },
3079 .probe = mmc_blk_probe,
3080 .remove = mmc_blk_remove,
3081 .shutdown = mmc_blk_shutdown,
3082};
3083
3084static int __init mmc_blk_init(void)
3085{
3086 int res;
3087
3088 res = bus_register(&mmc_rpmb_bus_type);
3089 if (res < 0) {
3090 pr_err("mmcblk: could not register RPMB bus type\n");
3091 return res;
3092 }
3093 res = alloc_chrdev_region(&mmc_rpmb_devt, 0, MAX_DEVICES, "rpmb");
3094 if (res < 0) {
3095 pr_err("mmcblk: failed to allocate rpmb chrdev region\n");
3096 goto out_bus_unreg;
3097 }
3098
3099 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
3100 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
3101
3102 max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
3103
3104 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
3105 if (res)
3106 goto out_chrdev_unreg;
3107
3108 res = mmc_register_driver(&mmc_driver);
3109 if (res)
3110 goto out_blkdev_unreg;
3111
3112 return 0;
3113
3114out_blkdev_unreg:
3115 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3116out_chrdev_unreg:
3117 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3118out_bus_unreg:
3119 bus_unregister(&mmc_rpmb_bus_type);
3120 return res;
3121}
3122
3123static void __exit mmc_blk_exit(void)
3124{
3125 mmc_unregister_driver(&mmc_driver);
3126 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3127 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3128 bus_unregister(&mmc_rpmb_bus_type);
3129}
3130
3131module_init(mmc_blk_init);
3132module_exit(mmc_blk_exit);
3133
3134MODULE_LICENSE("GPL");
3135MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
3136
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/cdev.h>
32#include <linux/mutex.h>
33#include <linux/scatterlist.h>
34#include <linux/string_helpers.h>
35#include <linux/delay.h>
36#include <linux/capability.h>
37#include <linux/compat.h>
38#include <linux/pm_runtime.h>
39#include <linux/idr.h>
40#include <linux/debugfs.h>
41
42#include <linux/mmc/ioctl.h>
43#include <linux/mmc/card.h>
44#include <linux/mmc/host.h>
45#include <linux/mmc/mmc.h>
46#include <linux/mmc/sd.h>
47
48#include <linux/uaccess.h>
49
50#include "queue.h"
51#include "block.h"
52#include "core.h"
53#include "card.h"
54#include "host.h"
55#include "bus.h"
56#include "mmc_ops.h"
57#include "quirks.h"
58#include "sd_ops.h"
59
60MODULE_ALIAS("mmc:block");
61#ifdef MODULE_PARAM_PREFIX
62#undef MODULE_PARAM_PREFIX
63#endif
64#define MODULE_PARAM_PREFIX "mmcblk."
65
66/*
67 * Set a 10 second timeout for polling write request busy state. Note, mmc core
68 * is setting a 3 second timeout for SD cards, and SDHCI has long had a 10
69 * second software timer to timeout the whole request, so 10 seconds should be
70 * ample.
71 */
72#define MMC_BLK_TIMEOUT_MS (10 * 1000)
73#define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
74#define MMC_EXTRACT_VALUE_FROM_ARG(x) ((x & 0x0000FF00) >> 8)
75
76#define mmc_req_rel_wr(req) ((req->cmd_flags & REQ_FUA) && \
77 (rq_data_dir(req) == WRITE))
78static DEFINE_MUTEX(block_mutex);
79
80/*
81 * The defaults come from config options but can be overriden by module
82 * or bootarg options.
83 */
84static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
85
86/*
87 * We've only got one major, so number of mmcblk devices is
88 * limited to (1 << 20) / number of minors per device. It is also
89 * limited by the MAX_DEVICES below.
90 */
91static int max_devices;
92
93#define MAX_DEVICES 256
94
95static DEFINE_IDA(mmc_blk_ida);
96static DEFINE_IDA(mmc_rpmb_ida);
97
98/*
99 * There is one mmc_blk_data per slot.
100 */
101struct mmc_blk_data {
102 struct device *parent;
103 struct gendisk *disk;
104 struct mmc_queue queue;
105 struct list_head part;
106 struct list_head rpmbs;
107
108 unsigned int flags;
109#define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
110#define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */
111
112 unsigned int usage;
113 unsigned int read_only;
114 unsigned int part_type;
115 unsigned int reset_done;
116#define MMC_BLK_READ BIT(0)
117#define MMC_BLK_WRITE BIT(1)
118#define MMC_BLK_DISCARD BIT(2)
119#define MMC_BLK_SECDISCARD BIT(3)
120#define MMC_BLK_CQE_RECOVERY BIT(4)
121
122 /*
123 * Only set in main mmc_blk_data associated
124 * with mmc_card with dev_set_drvdata, and keeps
125 * track of the current selected device partition.
126 */
127 unsigned int part_curr;
128 struct device_attribute force_ro;
129 struct device_attribute power_ro_lock;
130 int area_type;
131
132 /* debugfs files (only in main mmc_blk_data) */
133 struct dentry *status_dentry;
134 struct dentry *ext_csd_dentry;
135};
136
137/* Device type for RPMB character devices */
138static dev_t mmc_rpmb_devt;
139
140/* Bus type for RPMB character devices */
141static struct bus_type mmc_rpmb_bus_type = {
142 .name = "mmc_rpmb",
143};
144
145/**
146 * struct mmc_rpmb_data - special RPMB device type for these areas
147 * @dev: the device for the RPMB area
148 * @chrdev: character device for the RPMB area
149 * @id: unique device ID number
150 * @part_index: partition index (0 on first)
151 * @md: parent MMC block device
152 * @node: list item, so we can put this device on a list
153 */
154struct mmc_rpmb_data {
155 struct device dev;
156 struct cdev chrdev;
157 int id;
158 unsigned int part_index;
159 struct mmc_blk_data *md;
160 struct list_head node;
161};
162
163static DEFINE_MUTEX(open_lock);
164
165module_param(perdev_minors, int, 0444);
166MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
167
168static inline int mmc_blk_part_switch(struct mmc_card *card,
169 unsigned int part_type);
170static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
171 struct mmc_card *card,
172 int disable_multi,
173 struct mmc_queue *mq);
174static void mmc_blk_hsq_req_done(struct mmc_request *mrq);
175
176static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
177{
178 struct mmc_blk_data *md;
179
180 mutex_lock(&open_lock);
181 md = disk->private_data;
182 if (md && md->usage == 0)
183 md = NULL;
184 if (md)
185 md->usage++;
186 mutex_unlock(&open_lock);
187
188 return md;
189}
190
191static inline int mmc_get_devidx(struct gendisk *disk)
192{
193 int devidx = disk->first_minor / perdev_minors;
194 return devidx;
195}
196
197static void mmc_blk_put(struct mmc_blk_data *md)
198{
199 mutex_lock(&open_lock);
200 md->usage--;
201 if (md->usage == 0) {
202 int devidx = mmc_get_devidx(md->disk);
203 blk_put_queue(md->queue.queue);
204 ida_simple_remove(&mmc_blk_ida, devidx);
205 put_disk(md->disk);
206 kfree(md);
207 }
208 mutex_unlock(&open_lock);
209}
210
211static ssize_t power_ro_lock_show(struct device *dev,
212 struct device_attribute *attr, char *buf)
213{
214 int ret;
215 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
216 struct mmc_card *card = md->queue.card;
217 int locked = 0;
218
219 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
220 locked = 2;
221 else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
222 locked = 1;
223
224 ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
225
226 mmc_blk_put(md);
227
228 return ret;
229}
230
231static ssize_t power_ro_lock_store(struct device *dev,
232 struct device_attribute *attr, const char *buf, size_t count)
233{
234 int ret;
235 struct mmc_blk_data *md, *part_md;
236 struct mmc_queue *mq;
237 struct request *req;
238 unsigned long set;
239
240 if (kstrtoul(buf, 0, &set))
241 return -EINVAL;
242
243 if (set != 1)
244 return count;
245
246 md = mmc_blk_get(dev_to_disk(dev));
247 mq = &md->queue;
248
249 /* Dispatch locking to the block layer */
250 req = blk_get_request(mq->queue, REQ_OP_DRV_OUT, 0);
251 if (IS_ERR(req)) {
252 count = PTR_ERR(req);
253 goto out_put;
254 }
255 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_BOOT_WP;
256 blk_execute_rq(mq->queue, NULL, req, 0);
257 ret = req_to_mmc_queue_req(req)->drv_op_result;
258 blk_put_request(req);
259
260 if (!ret) {
261 pr_info("%s: Locking boot partition ro until next power on\n",
262 md->disk->disk_name);
263 set_disk_ro(md->disk, 1);
264
265 list_for_each_entry(part_md, &md->part, part)
266 if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
267 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
268 set_disk_ro(part_md->disk, 1);
269 }
270 }
271out_put:
272 mmc_blk_put(md);
273 return count;
274}
275
276static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
277 char *buf)
278{
279 int ret;
280 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
281
282 ret = snprintf(buf, PAGE_SIZE, "%d\n",
283 get_disk_ro(dev_to_disk(dev)) ^
284 md->read_only);
285 mmc_blk_put(md);
286 return ret;
287}
288
289static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
290 const char *buf, size_t count)
291{
292 int ret;
293 char *end;
294 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
295 unsigned long set = simple_strtoul(buf, &end, 0);
296 if (end == buf) {
297 ret = -EINVAL;
298 goto out;
299 }
300
301 set_disk_ro(dev_to_disk(dev), set || md->read_only);
302 ret = count;
303out:
304 mmc_blk_put(md);
305 return ret;
306}
307
308static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
309{
310 struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
311 int ret = -ENXIO;
312
313 mutex_lock(&block_mutex);
314 if (md) {
315 ret = 0;
316 if ((mode & FMODE_WRITE) && md->read_only) {
317 mmc_blk_put(md);
318 ret = -EROFS;
319 }
320 }
321 mutex_unlock(&block_mutex);
322
323 return ret;
324}
325
326static void mmc_blk_release(struct gendisk *disk, fmode_t mode)
327{
328 struct mmc_blk_data *md = disk->private_data;
329
330 mutex_lock(&block_mutex);
331 mmc_blk_put(md);
332 mutex_unlock(&block_mutex);
333}
334
335static int
336mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
337{
338 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
339 geo->heads = 4;
340 geo->sectors = 16;
341 return 0;
342}
343
344struct mmc_blk_ioc_data {
345 struct mmc_ioc_cmd ic;
346 unsigned char *buf;
347 u64 buf_bytes;
348 struct mmc_rpmb_data *rpmb;
349};
350
351static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
352 struct mmc_ioc_cmd __user *user)
353{
354 struct mmc_blk_ioc_data *idata;
355 int err;
356
357 idata = kmalloc(sizeof(*idata), GFP_KERNEL);
358 if (!idata) {
359 err = -ENOMEM;
360 goto out;
361 }
362
363 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
364 err = -EFAULT;
365 goto idata_err;
366 }
367
368 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
369 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
370 err = -EOVERFLOW;
371 goto idata_err;
372 }
373
374 if (!idata->buf_bytes) {
375 idata->buf = NULL;
376 return idata;
377 }
378
379 idata->buf = memdup_user((void __user *)(unsigned long)
380 idata->ic.data_ptr, idata->buf_bytes);
381 if (IS_ERR(idata->buf)) {
382 err = PTR_ERR(idata->buf);
383 goto idata_err;
384 }
385
386 return idata;
387
388idata_err:
389 kfree(idata);
390out:
391 return ERR_PTR(err);
392}
393
394static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
395 struct mmc_blk_ioc_data *idata)
396{
397 struct mmc_ioc_cmd *ic = &idata->ic;
398
399 if (copy_to_user(&(ic_ptr->response), ic->response,
400 sizeof(ic->response)))
401 return -EFAULT;
402
403 if (!idata->ic.write_flag) {
404 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
405 idata->buf, idata->buf_bytes))
406 return -EFAULT;
407 }
408
409 return 0;
410}
411
412static int card_busy_detect(struct mmc_card *card, unsigned int timeout_ms,
413 u32 *resp_errs)
414{
415 unsigned long timeout = jiffies + msecs_to_jiffies(timeout_ms);
416 int err = 0;
417 u32 status;
418
419 do {
420 bool done = time_after(jiffies, timeout);
421
422 err = __mmc_send_status(card, &status, 5);
423 if (err) {
424 dev_err(mmc_dev(card->host),
425 "error %d requesting status\n", err);
426 return err;
427 }
428
429 /* Accumulate any response error bits seen */
430 if (resp_errs)
431 *resp_errs |= status;
432
433 /*
434 * Timeout if the device never becomes ready for data and never
435 * leaves the program state.
436 */
437 if (done) {
438 dev_err(mmc_dev(card->host),
439 "Card stuck in wrong state! %s status: %#x\n",
440 __func__, status);
441 return -ETIMEDOUT;
442 }
443 } while (!mmc_ready_for_data(status));
444
445 return err;
446}
447
448static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
449 struct mmc_blk_ioc_data *idata)
450{
451 struct mmc_command cmd = {}, sbc = {};
452 struct mmc_data data = {};
453 struct mmc_request mrq = {};
454 struct scatterlist sg;
455 int err;
456 unsigned int target_part;
457
458 if (!card || !md || !idata)
459 return -EINVAL;
460
461 /*
462 * The RPMB accesses comes in from the character device, so we
463 * need to target these explicitly. Else we just target the
464 * partition type for the block device the ioctl() was issued
465 * on.
466 */
467 if (idata->rpmb) {
468 /* Support multiple RPMB partitions */
469 target_part = idata->rpmb->part_index;
470 target_part |= EXT_CSD_PART_CONFIG_ACC_RPMB;
471 } else {
472 target_part = md->part_type;
473 }
474
475 cmd.opcode = idata->ic.opcode;
476 cmd.arg = idata->ic.arg;
477 cmd.flags = idata->ic.flags;
478
479 if (idata->buf_bytes) {
480 data.sg = &sg;
481 data.sg_len = 1;
482 data.blksz = idata->ic.blksz;
483 data.blocks = idata->ic.blocks;
484
485 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
486
487 if (idata->ic.write_flag)
488 data.flags = MMC_DATA_WRITE;
489 else
490 data.flags = MMC_DATA_READ;
491
492 /* data.flags must already be set before doing this. */
493 mmc_set_data_timeout(&data, card);
494
495 /* Allow overriding the timeout_ns for empirical tuning. */
496 if (idata->ic.data_timeout_ns)
497 data.timeout_ns = idata->ic.data_timeout_ns;
498
499 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
500 /*
501 * Pretend this is a data transfer and rely on the
502 * host driver to compute timeout. When all host
503 * drivers support cmd.cmd_timeout for R1B, this
504 * can be changed to:
505 *
506 * mrq.data = NULL;
507 * cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
508 */
509 data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
510 }
511
512 mrq.data = &data;
513 }
514
515 mrq.cmd = &cmd;
516
517 err = mmc_blk_part_switch(card, target_part);
518 if (err)
519 return err;
520
521 if (idata->ic.is_acmd) {
522 err = mmc_app_cmd(card->host, card);
523 if (err)
524 return err;
525 }
526
527 if (idata->rpmb) {
528 sbc.opcode = MMC_SET_BLOCK_COUNT;
529 /*
530 * We don't do any blockcount validation because the max size
531 * may be increased by a future standard. We just copy the
532 * 'Reliable Write' bit here.
533 */
534 sbc.arg = data.blocks | (idata->ic.write_flag & BIT(31));
535 sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
536 mrq.sbc = &sbc;
537 }
538
539 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
540 (cmd.opcode == MMC_SWITCH))
541 return mmc_sanitize(card);
542
543 mmc_wait_for_req(card->host, &mrq);
544
545 if (cmd.error) {
546 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
547 __func__, cmd.error);
548 return cmd.error;
549 }
550 if (data.error) {
551 dev_err(mmc_dev(card->host), "%s: data error %d\n",
552 __func__, data.error);
553 return data.error;
554 }
555
556 /*
557 * Make sure the cache of the PARTITION_CONFIG register and
558 * PARTITION_ACCESS bits is updated in case the ioctl ext_csd write
559 * changed it successfully.
560 */
561 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_PART_CONFIG) &&
562 (cmd.opcode == MMC_SWITCH)) {
563 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
564 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg);
565
566 /*
567 * Update cache so the next mmc_blk_part_switch call operates
568 * on up-to-date data.
569 */
570 card->ext_csd.part_config = value;
571 main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK;
572 }
573
574 /*
575 * According to the SD specs, some commands require a delay after
576 * issuing the command.
577 */
578 if (idata->ic.postsleep_min_us)
579 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
580
581 memcpy(&(idata->ic.response), cmd.resp, sizeof(cmd.resp));
582
583 if (idata->rpmb || (cmd.flags & MMC_RSP_R1B)) {
584 /*
585 * Ensure RPMB/R1B command has completed by polling CMD13
586 * "Send Status".
587 */
588 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, NULL);
589 }
590
591 return err;
592}
593
594static int mmc_blk_ioctl_cmd(struct mmc_blk_data *md,
595 struct mmc_ioc_cmd __user *ic_ptr,
596 struct mmc_rpmb_data *rpmb)
597{
598 struct mmc_blk_ioc_data *idata;
599 struct mmc_blk_ioc_data *idatas[1];
600 struct mmc_queue *mq;
601 struct mmc_card *card;
602 int err = 0, ioc_err = 0;
603 struct request *req;
604
605 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
606 if (IS_ERR(idata))
607 return PTR_ERR(idata);
608 /* This will be NULL on non-RPMB ioctl():s */
609 idata->rpmb = rpmb;
610
611 card = md->queue.card;
612 if (IS_ERR(card)) {
613 err = PTR_ERR(card);
614 goto cmd_done;
615 }
616
617 /*
618 * Dispatch the ioctl() into the block request queue.
619 */
620 mq = &md->queue;
621 req = blk_get_request(mq->queue,
622 idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
623 if (IS_ERR(req)) {
624 err = PTR_ERR(req);
625 goto cmd_done;
626 }
627 idatas[0] = idata;
628 req_to_mmc_queue_req(req)->drv_op =
629 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
630 req_to_mmc_queue_req(req)->drv_op_data = idatas;
631 req_to_mmc_queue_req(req)->ioc_count = 1;
632 blk_execute_rq(mq->queue, NULL, req, 0);
633 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
634 err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
635 blk_put_request(req);
636
637cmd_done:
638 kfree(idata->buf);
639 kfree(idata);
640 return ioc_err ? ioc_err : err;
641}
642
643static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md,
644 struct mmc_ioc_multi_cmd __user *user,
645 struct mmc_rpmb_data *rpmb)
646{
647 struct mmc_blk_ioc_data **idata = NULL;
648 struct mmc_ioc_cmd __user *cmds = user->cmds;
649 struct mmc_card *card;
650 struct mmc_queue *mq;
651 int i, err = 0, ioc_err = 0;
652 __u64 num_of_cmds;
653 struct request *req;
654
655 if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
656 sizeof(num_of_cmds)))
657 return -EFAULT;
658
659 if (!num_of_cmds)
660 return 0;
661
662 if (num_of_cmds > MMC_IOC_MAX_CMDS)
663 return -EINVAL;
664
665 idata = kcalloc(num_of_cmds, sizeof(*idata), GFP_KERNEL);
666 if (!idata)
667 return -ENOMEM;
668
669 for (i = 0; i < num_of_cmds; i++) {
670 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
671 if (IS_ERR(idata[i])) {
672 err = PTR_ERR(idata[i]);
673 num_of_cmds = i;
674 goto cmd_err;
675 }
676 /* This will be NULL on non-RPMB ioctl():s */
677 idata[i]->rpmb = rpmb;
678 }
679
680 card = md->queue.card;
681 if (IS_ERR(card)) {
682 err = PTR_ERR(card);
683 goto cmd_err;
684 }
685
686
687 /*
688 * Dispatch the ioctl()s into the block request queue.
689 */
690 mq = &md->queue;
691 req = blk_get_request(mq->queue,
692 idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
693 if (IS_ERR(req)) {
694 err = PTR_ERR(req);
695 goto cmd_err;
696 }
697 req_to_mmc_queue_req(req)->drv_op =
698 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
699 req_to_mmc_queue_req(req)->drv_op_data = idata;
700 req_to_mmc_queue_req(req)->ioc_count = num_of_cmds;
701 blk_execute_rq(mq->queue, NULL, req, 0);
702 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
703
704 /* copy to user if data and response */
705 for (i = 0; i < num_of_cmds && !err; i++)
706 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
707
708 blk_put_request(req);
709
710cmd_err:
711 for (i = 0; i < num_of_cmds; i++) {
712 kfree(idata[i]->buf);
713 kfree(idata[i]);
714 }
715 kfree(idata);
716 return ioc_err ? ioc_err : err;
717}
718
719static int mmc_blk_check_blkdev(struct block_device *bdev)
720{
721 /*
722 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
723 * whole block device, not on a partition. This prevents overspray
724 * between sibling partitions.
725 */
726 if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
727 return -EPERM;
728 return 0;
729}
730
731static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
732 unsigned int cmd, unsigned long arg)
733{
734 struct mmc_blk_data *md;
735 int ret;
736
737 switch (cmd) {
738 case MMC_IOC_CMD:
739 ret = mmc_blk_check_blkdev(bdev);
740 if (ret)
741 return ret;
742 md = mmc_blk_get(bdev->bd_disk);
743 if (!md)
744 return -EINVAL;
745 ret = mmc_blk_ioctl_cmd(md,
746 (struct mmc_ioc_cmd __user *)arg,
747 NULL);
748 mmc_blk_put(md);
749 return ret;
750 case MMC_IOC_MULTI_CMD:
751 ret = mmc_blk_check_blkdev(bdev);
752 if (ret)
753 return ret;
754 md = mmc_blk_get(bdev->bd_disk);
755 if (!md)
756 return -EINVAL;
757 ret = mmc_blk_ioctl_multi_cmd(md,
758 (struct mmc_ioc_multi_cmd __user *)arg,
759 NULL);
760 mmc_blk_put(md);
761 return ret;
762 default:
763 return -EINVAL;
764 }
765}
766
767#ifdef CONFIG_COMPAT
768static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
769 unsigned int cmd, unsigned long arg)
770{
771 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
772}
773#endif
774
775static const struct block_device_operations mmc_bdops = {
776 .open = mmc_blk_open,
777 .release = mmc_blk_release,
778 .getgeo = mmc_blk_getgeo,
779 .owner = THIS_MODULE,
780 .ioctl = mmc_blk_ioctl,
781#ifdef CONFIG_COMPAT
782 .compat_ioctl = mmc_blk_compat_ioctl,
783#endif
784};
785
786static int mmc_blk_part_switch_pre(struct mmc_card *card,
787 unsigned int part_type)
788{
789 int ret = 0;
790
791 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
792 if (card->ext_csd.cmdq_en) {
793 ret = mmc_cmdq_disable(card);
794 if (ret)
795 return ret;
796 }
797 mmc_retune_pause(card->host);
798 }
799
800 return ret;
801}
802
803static int mmc_blk_part_switch_post(struct mmc_card *card,
804 unsigned int part_type)
805{
806 int ret = 0;
807
808 if (part_type == EXT_CSD_PART_CONFIG_ACC_RPMB) {
809 mmc_retune_unpause(card->host);
810 if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
811 ret = mmc_cmdq_enable(card);
812 }
813
814 return ret;
815}
816
817static inline int mmc_blk_part_switch(struct mmc_card *card,
818 unsigned int part_type)
819{
820 int ret = 0;
821 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
822
823 if (main_md->part_curr == part_type)
824 return 0;
825
826 if (mmc_card_mmc(card)) {
827 u8 part_config = card->ext_csd.part_config;
828
829 ret = mmc_blk_part_switch_pre(card, part_type);
830 if (ret)
831 return ret;
832
833 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
834 part_config |= part_type;
835
836 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
837 EXT_CSD_PART_CONFIG, part_config,
838 card->ext_csd.part_time);
839 if (ret) {
840 mmc_blk_part_switch_post(card, part_type);
841 return ret;
842 }
843
844 card->ext_csd.part_config = part_config;
845
846 ret = mmc_blk_part_switch_post(card, main_md->part_curr);
847 }
848
849 main_md->part_curr = part_type;
850 return ret;
851}
852
853static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
854{
855 int err;
856 u32 result;
857 __be32 *blocks;
858
859 struct mmc_request mrq = {};
860 struct mmc_command cmd = {};
861 struct mmc_data data = {};
862
863 struct scatterlist sg;
864
865 cmd.opcode = MMC_APP_CMD;
866 cmd.arg = card->rca << 16;
867 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
868
869 err = mmc_wait_for_cmd(card->host, &cmd, 0);
870 if (err)
871 return err;
872 if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
873 return -EIO;
874
875 memset(&cmd, 0, sizeof(struct mmc_command));
876
877 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
878 cmd.arg = 0;
879 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
880
881 data.blksz = 4;
882 data.blocks = 1;
883 data.flags = MMC_DATA_READ;
884 data.sg = &sg;
885 data.sg_len = 1;
886 mmc_set_data_timeout(&data, card);
887
888 mrq.cmd = &cmd;
889 mrq.data = &data;
890
891 blocks = kmalloc(4, GFP_KERNEL);
892 if (!blocks)
893 return -ENOMEM;
894
895 sg_init_one(&sg, blocks, 4);
896
897 mmc_wait_for_req(card->host, &mrq);
898
899 result = ntohl(*blocks);
900 kfree(blocks);
901
902 if (cmd.error || data.error)
903 return -EIO;
904
905 *written_blocks = result;
906
907 return 0;
908}
909
910static unsigned int mmc_blk_clock_khz(struct mmc_host *host)
911{
912 if (host->actual_clock)
913 return host->actual_clock / 1000;
914
915 /* Clock may be subject to a divisor, fudge it by a factor of 2. */
916 if (host->ios.clock)
917 return host->ios.clock / 2000;
918
919 /* How can there be no clock */
920 WARN_ON_ONCE(1);
921 return 100; /* 100 kHz is minimum possible value */
922}
923
924static unsigned int mmc_blk_data_timeout_ms(struct mmc_host *host,
925 struct mmc_data *data)
926{
927 unsigned int ms = DIV_ROUND_UP(data->timeout_ns, 1000000);
928 unsigned int khz;
929
930 if (data->timeout_clks) {
931 khz = mmc_blk_clock_khz(host);
932 ms += DIV_ROUND_UP(data->timeout_clks, khz);
933 }
934
935 return ms;
936}
937
938static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
939 int type)
940{
941 int err;
942
943 if (md->reset_done & type)
944 return -EEXIST;
945
946 md->reset_done |= type;
947 err = mmc_hw_reset(host);
948 /* Ensure we switch back to the correct partition */
949 if (err != -EOPNOTSUPP) {
950 struct mmc_blk_data *main_md =
951 dev_get_drvdata(&host->card->dev);
952 int part_err;
953
954 main_md->part_curr = main_md->part_type;
955 part_err = mmc_blk_part_switch(host->card, md->part_type);
956 if (part_err) {
957 /*
958 * We have failed to get back into the correct
959 * partition, so we need to abort the whole request.
960 */
961 return -ENODEV;
962 }
963 }
964 return err;
965}
966
967static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
968{
969 md->reset_done &= ~type;
970}
971
972/*
973 * The non-block commands come back from the block layer after it queued it and
974 * processed it with all other requests and then they get issued in this
975 * function.
976 */
977static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
978{
979 struct mmc_queue_req *mq_rq;
980 struct mmc_card *card = mq->card;
981 struct mmc_blk_data *md = mq->blkdata;
982 struct mmc_blk_ioc_data **idata;
983 bool rpmb_ioctl;
984 u8 **ext_csd;
985 u32 status;
986 int ret;
987 int i;
988
989 mq_rq = req_to_mmc_queue_req(req);
990 rpmb_ioctl = (mq_rq->drv_op == MMC_DRV_OP_IOCTL_RPMB);
991
992 switch (mq_rq->drv_op) {
993 case MMC_DRV_OP_IOCTL:
994 case MMC_DRV_OP_IOCTL_RPMB:
995 idata = mq_rq->drv_op_data;
996 for (i = 0, ret = 0; i < mq_rq->ioc_count; i++) {
997 ret = __mmc_blk_ioctl_cmd(card, md, idata[i]);
998 if (ret)
999 break;
1000 }
1001 /* Always switch back to main area after RPMB access */
1002 if (rpmb_ioctl)
1003 mmc_blk_part_switch(card, 0);
1004 break;
1005 case MMC_DRV_OP_BOOT_WP:
1006 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
1007 card->ext_csd.boot_ro_lock |
1008 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
1009 card->ext_csd.part_time);
1010 if (ret)
1011 pr_err("%s: Locking boot partition ro until next power on failed: %d\n",
1012 md->disk->disk_name, ret);
1013 else
1014 card->ext_csd.boot_ro_lock |=
1015 EXT_CSD_BOOT_WP_B_PWR_WP_EN;
1016 break;
1017 case MMC_DRV_OP_GET_CARD_STATUS:
1018 ret = mmc_send_status(card, &status);
1019 if (!ret)
1020 ret = status;
1021 break;
1022 case MMC_DRV_OP_GET_EXT_CSD:
1023 ext_csd = mq_rq->drv_op_data;
1024 ret = mmc_get_ext_csd(card, ext_csd);
1025 break;
1026 default:
1027 pr_err("%s: unknown driver specific operation\n",
1028 md->disk->disk_name);
1029 ret = -EINVAL;
1030 break;
1031 }
1032 mq_rq->drv_op_result = ret;
1033 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1034}
1035
1036static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1037{
1038 struct mmc_blk_data *md = mq->blkdata;
1039 struct mmc_card *card = md->queue.card;
1040 unsigned int from, nr;
1041 int err = 0, type = MMC_BLK_DISCARD;
1042 blk_status_t status = BLK_STS_OK;
1043
1044 if (!mmc_can_erase(card)) {
1045 status = BLK_STS_NOTSUPP;
1046 goto fail;
1047 }
1048
1049 from = blk_rq_pos(req);
1050 nr = blk_rq_sectors(req);
1051
1052 do {
1053 err = 0;
1054 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1055 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1056 INAND_CMD38_ARG_EXT_CSD,
1057 card->erase_arg == MMC_TRIM_ARG ?
1058 INAND_CMD38_ARG_TRIM :
1059 INAND_CMD38_ARG_ERASE,
1060 card->ext_csd.generic_cmd6_time);
1061 }
1062 if (!err)
1063 err = mmc_erase(card, from, nr, card->erase_arg);
1064 } while (err == -EIO && !mmc_blk_reset(md, card->host, type));
1065 if (err)
1066 status = BLK_STS_IOERR;
1067 else
1068 mmc_blk_reset_success(md, type);
1069fail:
1070 blk_mq_end_request(req, status);
1071}
1072
1073static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1074 struct request *req)
1075{
1076 struct mmc_blk_data *md = mq->blkdata;
1077 struct mmc_card *card = md->queue.card;
1078 unsigned int from, nr, arg;
1079 int err = 0, type = MMC_BLK_SECDISCARD;
1080 blk_status_t status = BLK_STS_OK;
1081
1082 if (!(mmc_can_secure_erase_trim(card))) {
1083 status = BLK_STS_NOTSUPP;
1084 goto out;
1085 }
1086
1087 from = blk_rq_pos(req);
1088 nr = blk_rq_sectors(req);
1089
1090 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1091 arg = MMC_SECURE_TRIM1_ARG;
1092 else
1093 arg = MMC_SECURE_ERASE_ARG;
1094
1095retry:
1096 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1097 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1098 INAND_CMD38_ARG_EXT_CSD,
1099 arg == MMC_SECURE_TRIM1_ARG ?
1100 INAND_CMD38_ARG_SECTRIM1 :
1101 INAND_CMD38_ARG_SECERASE,
1102 card->ext_csd.generic_cmd6_time);
1103 if (err)
1104 goto out_retry;
1105 }
1106
1107 err = mmc_erase(card, from, nr, arg);
1108 if (err == -EIO)
1109 goto out_retry;
1110 if (err) {
1111 status = BLK_STS_IOERR;
1112 goto out;
1113 }
1114
1115 if (arg == MMC_SECURE_TRIM1_ARG) {
1116 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1117 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1118 INAND_CMD38_ARG_EXT_CSD,
1119 INAND_CMD38_ARG_SECTRIM2,
1120 card->ext_csd.generic_cmd6_time);
1121 if (err)
1122 goto out_retry;
1123 }
1124
1125 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1126 if (err == -EIO)
1127 goto out_retry;
1128 if (err) {
1129 status = BLK_STS_IOERR;
1130 goto out;
1131 }
1132 }
1133
1134out_retry:
1135 if (err && !mmc_blk_reset(md, card->host, type))
1136 goto retry;
1137 if (!err)
1138 mmc_blk_reset_success(md, type);
1139out:
1140 blk_mq_end_request(req, status);
1141}
1142
1143static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1144{
1145 struct mmc_blk_data *md = mq->blkdata;
1146 struct mmc_card *card = md->queue.card;
1147 int ret = 0;
1148
1149 ret = mmc_flush_cache(card);
1150 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1151}
1152
1153/*
1154 * Reformat current write as a reliable write, supporting
1155 * both legacy and the enhanced reliable write MMC cards.
1156 * In each transfer we'll handle only as much as a single
1157 * reliable write can handle, thus finish the request in
1158 * partial completions.
1159 */
1160static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1161 struct mmc_card *card,
1162 struct request *req)
1163{
1164 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1165 /* Legacy mode imposes restrictions on transfers. */
1166 if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors))
1167 brq->data.blocks = 1;
1168
1169 if (brq->data.blocks > card->ext_csd.rel_sectors)
1170 brq->data.blocks = card->ext_csd.rel_sectors;
1171 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1172 brq->data.blocks = 1;
1173 }
1174}
1175
1176#define CMD_ERRORS_EXCL_OOR \
1177 (R1_ADDRESS_ERROR | /* Misaligned address */ \
1178 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
1179 R1_WP_VIOLATION | /* Tried to write to protected block */ \
1180 R1_CARD_ECC_FAILED | /* Card ECC failed */ \
1181 R1_CC_ERROR | /* Card controller error */ \
1182 R1_ERROR) /* General/unknown error */
1183
1184#define CMD_ERRORS \
1185 (CMD_ERRORS_EXCL_OOR | \
1186 R1_OUT_OF_RANGE) /* Command argument out of range */ \
1187
1188static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq)
1189{
1190 u32 val;
1191
1192 /*
1193 * Per the SD specification(physical layer version 4.10)[1],
1194 * section 4.3.3, it explicitly states that "When the last
1195 * block of user area is read using CMD18, the host should
1196 * ignore OUT_OF_RANGE error that may occur even the sequence
1197 * is correct". And JESD84-B51 for eMMC also has a similar
1198 * statement on section 6.8.3.
1199 *
1200 * Multiple block read/write could be done by either predefined
1201 * method, namely CMD23, or open-ending mode. For open-ending mode,
1202 * we should ignore the OUT_OF_RANGE error as it's normal behaviour.
1203 *
1204 * However the spec[1] doesn't tell us whether we should also
1205 * ignore that for predefined method. But per the spec[1], section
1206 * 4.15 Set Block Count Command, it says"If illegal block count
1207 * is set, out of range error will be indicated during read/write
1208 * operation (For example, data transfer is stopped at user area
1209 * boundary)." In another word, we could expect a out of range error
1210 * in the response for the following CMD18/25. And if argument of
1211 * CMD23 + the argument of CMD18/25 exceed the max number of blocks,
1212 * we could also expect to get a -ETIMEDOUT or any error number from
1213 * the host drivers due to missing data response(for write)/data(for
1214 * read), as the cards will stop the data transfer by itself per the
1215 * spec. So we only need to check R1_OUT_OF_RANGE for open-ending mode.
1216 */
1217
1218 if (!brq->stop.error) {
1219 bool oor_with_open_end;
1220 /* If there is no error yet, check R1 response */
1221
1222 val = brq->stop.resp[0] & CMD_ERRORS;
1223 oor_with_open_end = val & R1_OUT_OF_RANGE && !brq->mrq.sbc;
1224
1225 if (val && !oor_with_open_end)
1226 brq->stop.error = -EIO;
1227 }
1228}
1229
1230static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
1231 int disable_multi, bool *do_rel_wr_p,
1232 bool *do_data_tag_p)
1233{
1234 struct mmc_blk_data *md = mq->blkdata;
1235 struct mmc_card *card = md->queue.card;
1236 struct mmc_blk_request *brq = &mqrq->brq;
1237 struct request *req = mmc_queue_req_to_req(mqrq);
1238 bool do_rel_wr, do_data_tag;
1239
1240 /*
1241 * Reliable writes are used to implement Forced Unit Access and
1242 * are supported only on MMCs.
1243 */
1244 do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1245 rq_data_dir(req) == WRITE &&
1246 (md->flags & MMC_BLK_REL_WR);
1247
1248 memset(brq, 0, sizeof(struct mmc_blk_request));
1249
1250 brq->mrq.data = &brq->data;
1251 brq->mrq.tag = req->tag;
1252
1253 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1254 brq->stop.arg = 0;
1255
1256 if (rq_data_dir(req) == READ) {
1257 brq->data.flags = MMC_DATA_READ;
1258 brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1259 } else {
1260 brq->data.flags = MMC_DATA_WRITE;
1261 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1262 }
1263
1264 brq->data.blksz = 512;
1265 brq->data.blocks = blk_rq_sectors(req);
1266 brq->data.blk_addr = blk_rq_pos(req);
1267
1268 /*
1269 * The command queue supports 2 priorities: "high" (1) and "simple" (0).
1270 * The eMMC will give "high" priority tasks priority over "simple"
1271 * priority tasks. Here we always set "simple" priority by not setting
1272 * MMC_DATA_PRIO.
1273 */
1274
1275 /*
1276 * The block layer doesn't support all sector count
1277 * restrictions, so we need to be prepared for too big
1278 * requests.
1279 */
1280 if (brq->data.blocks > card->host->max_blk_count)
1281 brq->data.blocks = card->host->max_blk_count;
1282
1283 if (brq->data.blocks > 1) {
1284 /*
1285 * Some SD cards in SPI mode return a CRC error or even lock up
1286 * completely when trying to read the last block using a
1287 * multiblock read command.
1288 */
1289 if (mmc_host_is_spi(card->host) && (rq_data_dir(req) == READ) &&
1290 (blk_rq_pos(req) + blk_rq_sectors(req) ==
1291 get_capacity(md->disk)))
1292 brq->data.blocks--;
1293
1294 /*
1295 * After a read error, we redo the request one sector
1296 * at a time in order to accurately determine which
1297 * sectors can be read successfully.
1298 */
1299 if (disable_multi)
1300 brq->data.blocks = 1;
1301
1302 /*
1303 * Some controllers have HW issues while operating
1304 * in multiple I/O mode
1305 */
1306 if (card->host->ops->multi_io_quirk)
1307 brq->data.blocks = card->host->ops->multi_io_quirk(card,
1308 (rq_data_dir(req) == READ) ?
1309 MMC_DATA_READ : MMC_DATA_WRITE,
1310 brq->data.blocks);
1311 }
1312
1313 if (do_rel_wr) {
1314 mmc_apply_rel_rw(brq, card, req);
1315 brq->data.flags |= MMC_DATA_REL_WR;
1316 }
1317
1318 /*
1319 * Data tag is used only during writing meta data to speed
1320 * up write and any subsequent read of this meta data
1321 */
1322 do_data_tag = card->ext_csd.data_tag_unit_size &&
1323 (req->cmd_flags & REQ_META) &&
1324 (rq_data_dir(req) == WRITE) &&
1325 ((brq->data.blocks * brq->data.blksz) >=
1326 card->ext_csd.data_tag_unit_size);
1327
1328 if (do_data_tag)
1329 brq->data.flags |= MMC_DATA_DAT_TAG;
1330
1331 mmc_set_data_timeout(&brq->data, card);
1332
1333 brq->data.sg = mqrq->sg;
1334 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1335
1336 /*
1337 * Adjust the sg list so it is the same size as the
1338 * request.
1339 */
1340 if (brq->data.blocks != blk_rq_sectors(req)) {
1341 int i, data_size = brq->data.blocks << 9;
1342 struct scatterlist *sg;
1343
1344 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1345 data_size -= sg->length;
1346 if (data_size <= 0) {
1347 sg->length += data_size;
1348 i++;
1349 break;
1350 }
1351 }
1352 brq->data.sg_len = i;
1353 }
1354
1355 if (do_rel_wr_p)
1356 *do_rel_wr_p = do_rel_wr;
1357
1358 if (do_data_tag_p)
1359 *do_data_tag_p = do_data_tag;
1360}
1361
1362#define MMC_CQE_RETRIES 2
1363
1364static void mmc_blk_cqe_complete_rq(struct mmc_queue *mq, struct request *req)
1365{
1366 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1367 struct mmc_request *mrq = &mqrq->brq.mrq;
1368 struct request_queue *q = req->q;
1369 struct mmc_host *host = mq->card->host;
1370 enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
1371 unsigned long flags;
1372 bool put_card;
1373 int err;
1374
1375 mmc_cqe_post_req(host, mrq);
1376
1377 if (mrq->cmd && mrq->cmd->error)
1378 err = mrq->cmd->error;
1379 else if (mrq->data && mrq->data->error)
1380 err = mrq->data->error;
1381 else
1382 err = 0;
1383
1384 if (err) {
1385 if (mqrq->retries++ < MMC_CQE_RETRIES)
1386 blk_mq_requeue_request(req, true);
1387 else
1388 blk_mq_end_request(req, BLK_STS_IOERR);
1389 } else if (mrq->data) {
1390 if (blk_update_request(req, BLK_STS_OK, mrq->data->bytes_xfered))
1391 blk_mq_requeue_request(req, true);
1392 else
1393 __blk_mq_end_request(req, BLK_STS_OK);
1394 } else {
1395 blk_mq_end_request(req, BLK_STS_OK);
1396 }
1397
1398 spin_lock_irqsave(&mq->lock, flags);
1399
1400 mq->in_flight[issue_type] -= 1;
1401
1402 put_card = (mmc_tot_in_flight(mq) == 0);
1403
1404 mmc_cqe_check_busy(mq);
1405
1406 spin_unlock_irqrestore(&mq->lock, flags);
1407
1408 if (!mq->cqe_busy)
1409 blk_mq_run_hw_queues(q, true);
1410
1411 if (put_card)
1412 mmc_put_card(mq->card, &mq->ctx);
1413}
1414
1415void mmc_blk_cqe_recovery(struct mmc_queue *mq)
1416{
1417 struct mmc_card *card = mq->card;
1418 struct mmc_host *host = card->host;
1419 int err;
1420
1421 pr_debug("%s: CQE recovery start\n", mmc_hostname(host));
1422
1423 err = mmc_cqe_recovery(host);
1424 if (err)
1425 mmc_blk_reset(mq->blkdata, host, MMC_BLK_CQE_RECOVERY);
1426 else
1427 mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
1428
1429 pr_debug("%s: CQE recovery done\n", mmc_hostname(host));
1430}
1431
1432static void mmc_blk_cqe_req_done(struct mmc_request *mrq)
1433{
1434 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
1435 brq.mrq);
1436 struct request *req = mmc_queue_req_to_req(mqrq);
1437 struct request_queue *q = req->q;
1438 struct mmc_queue *mq = q->queuedata;
1439
1440 /*
1441 * Block layer timeouts race with completions which means the normal
1442 * completion path cannot be used during recovery.
1443 */
1444 if (mq->in_recovery)
1445 mmc_blk_cqe_complete_rq(mq, req);
1446 else if (likely(!blk_should_fake_timeout(req->q)))
1447 blk_mq_complete_request(req);
1448}
1449
1450static int mmc_blk_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
1451{
1452 mrq->done = mmc_blk_cqe_req_done;
1453 mrq->recovery_notifier = mmc_cqe_recovery_notifier;
1454
1455 return mmc_cqe_start_req(host, mrq);
1456}
1457
1458static struct mmc_request *mmc_blk_cqe_prep_dcmd(struct mmc_queue_req *mqrq,
1459 struct request *req)
1460{
1461 struct mmc_blk_request *brq = &mqrq->brq;
1462
1463 memset(brq, 0, sizeof(*brq));
1464
1465 brq->mrq.cmd = &brq->cmd;
1466 brq->mrq.tag = req->tag;
1467
1468 return &brq->mrq;
1469}
1470
1471static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req)
1472{
1473 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1474 struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req);
1475
1476 mrq->cmd->opcode = MMC_SWITCH;
1477 mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1478 (EXT_CSD_FLUSH_CACHE << 16) |
1479 (1 << 8) |
1480 EXT_CSD_CMD_SET_NORMAL;
1481 mrq->cmd->flags = MMC_CMD_AC | MMC_RSP_R1B;
1482
1483 return mmc_blk_cqe_start_req(mq->card->host, mrq);
1484}
1485
1486static int mmc_blk_hsq_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1487{
1488 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1489 struct mmc_host *host = mq->card->host;
1490 int err;
1491
1492 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
1493 mqrq->brq.mrq.done = mmc_blk_hsq_req_done;
1494 mmc_pre_req(host, &mqrq->brq.mrq);
1495
1496 err = mmc_cqe_start_req(host, &mqrq->brq.mrq);
1497 if (err)
1498 mmc_post_req(host, &mqrq->brq.mrq, err);
1499
1500 return err;
1501}
1502
1503static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1504{
1505 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1506 struct mmc_host *host = mq->card->host;
1507
1508 if (host->hsq_enabled)
1509 return mmc_blk_hsq_issue_rw_rq(mq, req);
1510
1511 mmc_blk_data_prep(mq, mqrq, 0, NULL, NULL);
1512
1513 return mmc_blk_cqe_start_req(mq->card->host, &mqrq->brq.mrq);
1514}
1515
1516static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1517 struct mmc_card *card,
1518 int disable_multi,
1519 struct mmc_queue *mq)
1520{
1521 u32 readcmd, writecmd;
1522 struct mmc_blk_request *brq = &mqrq->brq;
1523 struct request *req = mmc_queue_req_to_req(mqrq);
1524 struct mmc_blk_data *md = mq->blkdata;
1525 bool do_rel_wr, do_data_tag;
1526
1527 mmc_blk_data_prep(mq, mqrq, disable_multi, &do_rel_wr, &do_data_tag);
1528
1529 brq->mrq.cmd = &brq->cmd;
1530
1531 brq->cmd.arg = blk_rq_pos(req);
1532 if (!mmc_card_blockaddr(card))
1533 brq->cmd.arg <<= 9;
1534 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1535
1536 if (brq->data.blocks > 1 || do_rel_wr) {
1537 /* SPI multiblock writes terminate using a special
1538 * token, not a STOP_TRANSMISSION request.
1539 */
1540 if (!mmc_host_is_spi(card->host) ||
1541 rq_data_dir(req) == READ)
1542 brq->mrq.stop = &brq->stop;
1543 readcmd = MMC_READ_MULTIPLE_BLOCK;
1544 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1545 } else {
1546 brq->mrq.stop = NULL;
1547 readcmd = MMC_READ_SINGLE_BLOCK;
1548 writecmd = MMC_WRITE_BLOCK;
1549 }
1550 brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd;
1551
1552 /*
1553 * Pre-defined multi-block transfers are preferable to
1554 * open ended-ones (and necessary for reliable writes).
1555 * However, it is not sufficient to just send CMD23,
1556 * and avoid the final CMD12, as on an error condition
1557 * CMD12 (stop) needs to be sent anyway. This, coupled
1558 * with Auto-CMD23 enhancements provided by some
1559 * hosts, means that the complexity of dealing
1560 * with this is best left to the host. If CMD23 is
1561 * supported by card and host, we'll fill sbc in and let
1562 * the host deal with handling it correctly. This means
1563 * that for hosts that don't expose MMC_CAP_CMD23, no
1564 * change of behavior will be observed.
1565 *
1566 * N.B: Some MMC cards experience perf degradation.
1567 * We'll avoid using CMD23-bounded multiblock writes for
1568 * these, while retaining features like reliable writes.
1569 */
1570 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1571 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1572 do_data_tag)) {
1573 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1574 brq->sbc.arg = brq->data.blocks |
1575 (do_rel_wr ? (1 << 31) : 0) |
1576 (do_data_tag ? (1 << 29) : 0);
1577 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1578 brq->mrq.sbc = &brq->sbc;
1579 }
1580}
1581
1582#define MMC_MAX_RETRIES 5
1583#define MMC_DATA_RETRIES 2
1584#define MMC_NO_RETRIES (MMC_MAX_RETRIES + 1)
1585
1586static int mmc_blk_send_stop(struct mmc_card *card, unsigned int timeout)
1587{
1588 struct mmc_command cmd = {
1589 .opcode = MMC_STOP_TRANSMISSION,
1590 .flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC,
1591 /* Some hosts wait for busy anyway, so provide a busy timeout */
1592 .busy_timeout = timeout,
1593 };
1594
1595 return mmc_wait_for_cmd(card->host, &cmd, 5);
1596}
1597
1598static int mmc_blk_fix_state(struct mmc_card *card, struct request *req)
1599{
1600 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1601 struct mmc_blk_request *brq = &mqrq->brq;
1602 unsigned int timeout = mmc_blk_data_timeout_ms(card->host, &brq->data);
1603 int err;
1604
1605 mmc_retune_hold_now(card->host);
1606
1607 mmc_blk_send_stop(card, timeout);
1608
1609 err = card_busy_detect(card, timeout, NULL);
1610
1611 mmc_retune_release(card->host);
1612
1613 return err;
1614}
1615
1616#define MMC_READ_SINGLE_RETRIES 2
1617
1618/* Single sector read during recovery */
1619static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
1620{
1621 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1622 struct mmc_request *mrq = &mqrq->brq.mrq;
1623 struct mmc_card *card = mq->card;
1624 struct mmc_host *host = card->host;
1625 blk_status_t error = BLK_STS_OK;
1626 int retries = 0;
1627
1628 do {
1629 u32 status;
1630 int err;
1631
1632 mmc_blk_rw_rq_prep(mqrq, card, 1, mq);
1633
1634 mmc_wait_for_req(host, mrq);
1635
1636 err = mmc_send_status(card, &status);
1637 if (err)
1638 goto error_exit;
1639
1640 if (!mmc_host_is_spi(host) &&
1641 !mmc_ready_for_data(status)) {
1642 err = mmc_blk_fix_state(card, req);
1643 if (err)
1644 goto error_exit;
1645 }
1646
1647 if (mrq->cmd->error && retries++ < MMC_READ_SINGLE_RETRIES)
1648 continue;
1649
1650 retries = 0;
1651
1652 if (mrq->cmd->error ||
1653 mrq->data->error ||
1654 (!mmc_host_is_spi(host) &&
1655 (mrq->cmd->resp[0] & CMD_ERRORS || status & CMD_ERRORS)))
1656 error = BLK_STS_IOERR;
1657 else
1658 error = BLK_STS_OK;
1659
1660 } while (blk_update_request(req, error, 512));
1661
1662 return;
1663
1664error_exit:
1665 mrq->data->bytes_xfered = 0;
1666 blk_update_request(req, BLK_STS_IOERR, 512);
1667 /* Let it try the remaining request again */
1668 if (mqrq->retries > MMC_MAX_RETRIES - 1)
1669 mqrq->retries = MMC_MAX_RETRIES - 1;
1670}
1671
1672static inline bool mmc_blk_oor_valid(struct mmc_blk_request *brq)
1673{
1674 return !!brq->mrq.sbc;
1675}
1676
1677static inline u32 mmc_blk_stop_err_bits(struct mmc_blk_request *brq)
1678{
1679 return mmc_blk_oor_valid(brq) ? CMD_ERRORS : CMD_ERRORS_EXCL_OOR;
1680}
1681
1682/*
1683 * Check for errors the host controller driver might not have seen such as
1684 * response mode errors or invalid card state.
1685 */
1686static bool mmc_blk_status_error(struct request *req, u32 status)
1687{
1688 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1689 struct mmc_blk_request *brq = &mqrq->brq;
1690 struct mmc_queue *mq = req->q->queuedata;
1691 u32 stop_err_bits;
1692
1693 if (mmc_host_is_spi(mq->card->host))
1694 return false;
1695
1696 stop_err_bits = mmc_blk_stop_err_bits(brq);
1697
1698 return brq->cmd.resp[0] & CMD_ERRORS ||
1699 brq->stop.resp[0] & stop_err_bits ||
1700 status & stop_err_bits ||
1701 (rq_data_dir(req) == WRITE && !mmc_ready_for_data(status));
1702}
1703
1704static inline bool mmc_blk_cmd_started(struct mmc_blk_request *brq)
1705{
1706 return !brq->sbc.error && !brq->cmd.error &&
1707 !(brq->cmd.resp[0] & CMD_ERRORS);
1708}
1709
1710/*
1711 * Requests are completed by mmc_blk_mq_complete_rq() which sets simple
1712 * policy:
1713 * 1. A request that has transferred at least some data is considered
1714 * successful and will be requeued if there is remaining data to
1715 * transfer.
1716 * 2. Otherwise the number of retries is incremented and the request
1717 * will be requeued if there are remaining retries.
1718 * 3. Otherwise the request will be errored out.
1719 * That means mmc_blk_mq_complete_rq() is controlled by bytes_xfered and
1720 * mqrq->retries. So there are only 4 possible actions here:
1721 * 1. do not accept the bytes_xfered value i.e. set it to zero
1722 * 2. change mqrq->retries to determine the number of retries
1723 * 3. try to reset the card
1724 * 4. read one sector at a time
1725 */
1726static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req)
1727{
1728 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1729 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1730 struct mmc_blk_request *brq = &mqrq->brq;
1731 struct mmc_blk_data *md = mq->blkdata;
1732 struct mmc_card *card = mq->card;
1733 u32 status;
1734 u32 blocks;
1735 int err;
1736
1737 /*
1738 * Some errors the host driver might not have seen. Set the number of
1739 * bytes transferred to zero in that case.
1740 */
1741 err = __mmc_send_status(card, &status, 0);
1742 if (err || mmc_blk_status_error(req, status))
1743 brq->data.bytes_xfered = 0;
1744
1745 mmc_retune_release(card->host);
1746
1747 /*
1748 * Try again to get the status. This also provides an opportunity for
1749 * re-tuning.
1750 */
1751 if (err)
1752 err = __mmc_send_status(card, &status, 0);
1753
1754 /*
1755 * Nothing more to do after the number of bytes transferred has been
1756 * updated and there is no card.
1757 */
1758 if (err && mmc_detect_card_removed(card->host))
1759 return;
1760
1761 /* Try to get back to "tran" state */
1762 if (!mmc_host_is_spi(mq->card->host) &&
1763 (err || !mmc_ready_for_data(status)))
1764 err = mmc_blk_fix_state(mq->card, req);
1765
1766 /*
1767 * Special case for SD cards where the card might record the number of
1768 * blocks written.
1769 */
1770 if (!err && mmc_blk_cmd_started(brq) && mmc_card_sd(card) &&
1771 rq_data_dir(req) == WRITE) {
1772 if (mmc_sd_num_wr_blocks(card, &blocks))
1773 brq->data.bytes_xfered = 0;
1774 else
1775 brq->data.bytes_xfered = blocks << 9;
1776 }
1777
1778 /* Reset if the card is in a bad state */
1779 if (!mmc_host_is_spi(mq->card->host) &&
1780 err && mmc_blk_reset(md, card->host, type)) {
1781 pr_err("%s: recovery failed!\n", req->rq_disk->disk_name);
1782 mqrq->retries = MMC_NO_RETRIES;
1783 return;
1784 }
1785
1786 /*
1787 * If anything was done, just return and if there is anything remaining
1788 * on the request it will get requeued.
1789 */
1790 if (brq->data.bytes_xfered)
1791 return;
1792
1793 /* Reset before last retry */
1794 if (mqrq->retries + 1 == MMC_MAX_RETRIES)
1795 mmc_blk_reset(md, card->host, type);
1796
1797 /* Command errors fail fast, so use all MMC_MAX_RETRIES */
1798 if (brq->sbc.error || brq->cmd.error)
1799 return;
1800
1801 /* Reduce the remaining retries for data errors */
1802 if (mqrq->retries < MMC_MAX_RETRIES - MMC_DATA_RETRIES) {
1803 mqrq->retries = MMC_MAX_RETRIES - MMC_DATA_RETRIES;
1804 return;
1805 }
1806
1807 /* FIXME: Missing single sector read for large sector size */
1808 if (!mmc_large_sector(card) && rq_data_dir(req) == READ &&
1809 brq->data.blocks > 1) {
1810 /* Read one sector at a time */
1811 mmc_blk_read_single(mq, req);
1812 return;
1813 }
1814}
1815
1816static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq)
1817{
1818 mmc_blk_eval_resp_error(brq);
1819
1820 return brq->sbc.error || brq->cmd.error || brq->stop.error ||
1821 brq->data.error || brq->cmd.resp[0] & CMD_ERRORS;
1822}
1823
1824static int mmc_blk_card_busy(struct mmc_card *card, struct request *req)
1825{
1826 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1827 u32 status = 0;
1828 int err;
1829
1830 if (mmc_host_is_spi(card->host) || rq_data_dir(req) == READ)
1831 return 0;
1832
1833 err = card_busy_detect(card, MMC_BLK_TIMEOUT_MS, &status);
1834
1835 /*
1836 * Do not assume data transferred correctly if there are any error bits
1837 * set.
1838 */
1839 if (status & mmc_blk_stop_err_bits(&mqrq->brq)) {
1840 mqrq->brq.data.bytes_xfered = 0;
1841 err = err ? err : -EIO;
1842 }
1843
1844 /* Copy the exception bit so it will be seen later on */
1845 if (mmc_card_mmc(card) && status & R1_EXCEPTION_EVENT)
1846 mqrq->brq.cmd.resp[0] |= R1_EXCEPTION_EVENT;
1847
1848 return err;
1849}
1850
1851static inline void mmc_blk_rw_reset_success(struct mmc_queue *mq,
1852 struct request *req)
1853{
1854 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1855
1856 mmc_blk_reset_success(mq->blkdata, type);
1857}
1858
1859static void mmc_blk_mq_complete_rq(struct mmc_queue *mq, struct request *req)
1860{
1861 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1862 unsigned int nr_bytes = mqrq->brq.data.bytes_xfered;
1863
1864 if (nr_bytes) {
1865 if (blk_update_request(req, BLK_STS_OK, nr_bytes))
1866 blk_mq_requeue_request(req, true);
1867 else
1868 __blk_mq_end_request(req, BLK_STS_OK);
1869 } else if (!blk_rq_bytes(req)) {
1870 __blk_mq_end_request(req, BLK_STS_IOERR);
1871 } else if (mqrq->retries++ < MMC_MAX_RETRIES) {
1872 blk_mq_requeue_request(req, true);
1873 } else {
1874 if (mmc_card_removed(mq->card))
1875 req->rq_flags |= RQF_QUIET;
1876 blk_mq_end_request(req, BLK_STS_IOERR);
1877 }
1878}
1879
1880static bool mmc_blk_urgent_bkops_needed(struct mmc_queue *mq,
1881 struct mmc_queue_req *mqrq)
1882{
1883 return mmc_card_mmc(mq->card) && !mmc_host_is_spi(mq->card->host) &&
1884 (mqrq->brq.cmd.resp[0] & R1_EXCEPTION_EVENT ||
1885 mqrq->brq.stop.resp[0] & R1_EXCEPTION_EVENT);
1886}
1887
1888static void mmc_blk_urgent_bkops(struct mmc_queue *mq,
1889 struct mmc_queue_req *mqrq)
1890{
1891 if (mmc_blk_urgent_bkops_needed(mq, mqrq))
1892 mmc_run_bkops(mq->card);
1893}
1894
1895static void mmc_blk_hsq_req_done(struct mmc_request *mrq)
1896{
1897 struct mmc_queue_req *mqrq =
1898 container_of(mrq, struct mmc_queue_req, brq.mrq);
1899 struct request *req = mmc_queue_req_to_req(mqrq);
1900 struct request_queue *q = req->q;
1901 struct mmc_queue *mq = q->queuedata;
1902 struct mmc_host *host = mq->card->host;
1903 unsigned long flags;
1904
1905 if (mmc_blk_rq_error(&mqrq->brq) ||
1906 mmc_blk_urgent_bkops_needed(mq, mqrq)) {
1907 spin_lock_irqsave(&mq->lock, flags);
1908 mq->recovery_needed = true;
1909 mq->recovery_req = req;
1910 spin_unlock_irqrestore(&mq->lock, flags);
1911
1912 host->cqe_ops->cqe_recovery_start(host);
1913
1914 schedule_work(&mq->recovery_work);
1915 return;
1916 }
1917
1918 mmc_blk_rw_reset_success(mq, req);
1919
1920 /*
1921 * Block layer timeouts race with completions which means the normal
1922 * completion path cannot be used during recovery.
1923 */
1924 if (mq->in_recovery)
1925 mmc_blk_cqe_complete_rq(mq, req);
1926 else if (likely(!blk_should_fake_timeout(req->q)))
1927 blk_mq_complete_request(req);
1928}
1929
1930void mmc_blk_mq_complete(struct request *req)
1931{
1932 struct mmc_queue *mq = req->q->queuedata;
1933
1934 if (mq->use_cqe)
1935 mmc_blk_cqe_complete_rq(mq, req);
1936 else if (likely(!blk_should_fake_timeout(req->q)))
1937 mmc_blk_mq_complete_rq(mq, req);
1938}
1939
1940static void mmc_blk_mq_poll_completion(struct mmc_queue *mq,
1941 struct request *req)
1942{
1943 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1944 struct mmc_host *host = mq->card->host;
1945
1946 if (mmc_blk_rq_error(&mqrq->brq) ||
1947 mmc_blk_card_busy(mq->card, req)) {
1948 mmc_blk_mq_rw_recovery(mq, req);
1949 } else {
1950 mmc_blk_rw_reset_success(mq, req);
1951 mmc_retune_release(host);
1952 }
1953
1954 mmc_blk_urgent_bkops(mq, mqrq);
1955}
1956
1957static void mmc_blk_mq_dec_in_flight(struct mmc_queue *mq, struct request *req)
1958{
1959 unsigned long flags;
1960 bool put_card;
1961
1962 spin_lock_irqsave(&mq->lock, flags);
1963
1964 mq->in_flight[mmc_issue_type(mq, req)] -= 1;
1965
1966 put_card = (mmc_tot_in_flight(mq) == 0);
1967
1968 spin_unlock_irqrestore(&mq->lock, flags);
1969
1970 if (put_card)
1971 mmc_put_card(mq->card, &mq->ctx);
1972}
1973
1974static void mmc_blk_mq_post_req(struct mmc_queue *mq, struct request *req)
1975{
1976 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1977 struct mmc_request *mrq = &mqrq->brq.mrq;
1978 struct mmc_host *host = mq->card->host;
1979
1980 mmc_post_req(host, mrq, 0);
1981
1982 /*
1983 * Block layer timeouts race with completions which means the normal
1984 * completion path cannot be used during recovery.
1985 */
1986 if (mq->in_recovery)
1987 mmc_blk_mq_complete_rq(mq, req);
1988 else if (likely(!blk_should_fake_timeout(req->q)))
1989 blk_mq_complete_request(req);
1990
1991 mmc_blk_mq_dec_in_flight(mq, req);
1992}
1993
1994void mmc_blk_mq_recovery(struct mmc_queue *mq)
1995{
1996 struct request *req = mq->recovery_req;
1997 struct mmc_host *host = mq->card->host;
1998 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1999
2000 mq->recovery_req = NULL;
2001 mq->rw_wait = false;
2002
2003 if (mmc_blk_rq_error(&mqrq->brq)) {
2004 mmc_retune_hold_now(host);
2005 mmc_blk_mq_rw_recovery(mq, req);
2006 }
2007
2008 mmc_blk_urgent_bkops(mq, mqrq);
2009
2010 mmc_blk_mq_post_req(mq, req);
2011}
2012
2013static void mmc_blk_mq_complete_prev_req(struct mmc_queue *mq,
2014 struct request **prev_req)
2015{
2016 if (mmc_host_done_complete(mq->card->host))
2017 return;
2018
2019 mutex_lock(&mq->complete_lock);
2020
2021 if (!mq->complete_req)
2022 goto out_unlock;
2023
2024 mmc_blk_mq_poll_completion(mq, mq->complete_req);
2025
2026 if (prev_req)
2027 *prev_req = mq->complete_req;
2028 else
2029 mmc_blk_mq_post_req(mq, mq->complete_req);
2030
2031 mq->complete_req = NULL;
2032
2033out_unlock:
2034 mutex_unlock(&mq->complete_lock);
2035}
2036
2037void mmc_blk_mq_complete_work(struct work_struct *work)
2038{
2039 struct mmc_queue *mq = container_of(work, struct mmc_queue,
2040 complete_work);
2041
2042 mmc_blk_mq_complete_prev_req(mq, NULL);
2043}
2044
2045static void mmc_blk_mq_req_done(struct mmc_request *mrq)
2046{
2047 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
2048 brq.mrq);
2049 struct request *req = mmc_queue_req_to_req(mqrq);
2050 struct request_queue *q = req->q;
2051 struct mmc_queue *mq = q->queuedata;
2052 struct mmc_host *host = mq->card->host;
2053 unsigned long flags;
2054
2055 if (!mmc_host_done_complete(host)) {
2056 bool waiting;
2057
2058 /*
2059 * We cannot complete the request in this context, so record
2060 * that there is a request to complete, and that a following
2061 * request does not need to wait (although it does need to
2062 * complete complete_req first).
2063 */
2064 spin_lock_irqsave(&mq->lock, flags);
2065 mq->complete_req = req;
2066 mq->rw_wait = false;
2067 waiting = mq->waiting;
2068 spin_unlock_irqrestore(&mq->lock, flags);
2069
2070 /*
2071 * If 'waiting' then the waiting task will complete this
2072 * request, otherwise queue a work to do it. Note that
2073 * complete_work may still race with the dispatch of a following
2074 * request.
2075 */
2076 if (waiting)
2077 wake_up(&mq->wait);
2078 else
2079 queue_work(mq->card->complete_wq, &mq->complete_work);
2080
2081 return;
2082 }
2083
2084 /* Take the recovery path for errors or urgent background operations */
2085 if (mmc_blk_rq_error(&mqrq->brq) ||
2086 mmc_blk_urgent_bkops_needed(mq, mqrq)) {
2087 spin_lock_irqsave(&mq->lock, flags);
2088 mq->recovery_needed = true;
2089 mq->recovery_req = req;
2090 spin_unlock_irqrestore(&mq->lock, flags);
2091 wake_up(&mq->wait);
2092 schedule_work(&mq->recovery_work);
2093 return;
2094 }
2095
2096 mmc_blk_rw_reset_success(mq, req);
2097
2098 mq->rw_wait = false;
2099 wake_up(&mq->wait);
2100
2101 mmc_blk_mq_post_req(mq, req);
2102}
2103
2104static bool mmc_blk_rw_wait_cond(struct mmc_queue *mq, int *err)
2105{
2106 unsigned long flags;
2107 bool done;
2108
2109 /*
2110 * Wait while there is another request in progress, but not if recovery
2111 * is needed. Also indicate whether there is a request waiting to start.
2112 */
2113 spin_lock_irqsave(&mq->lock, flags);
2114 if (mq->recovery_needed) {
2115 *err = -EBUSY;
2116 done = true;
2117 } else {
2118 done = !mq->rw_wait;
2119 }
2120 mq->waiting = !done;
2121 spin_unlock_irqrestore(&mq->lock, flags);
2122
2123 return done;
2124}
2125
2126static int mmc_blk_rw_wait(struct mmc_queue *mq, struct request **prev_req)
2127{
2128 int err = 0;
2129
2130 wait_event(mq->wait, mmc_blk_rw_wait_cond(mq, &err));
2131
2132 /* Always complete the previous request if there is one */
2133 mmc_blk_mq_complete_prev_req(mq, prev_req);
2134
2135 return err;
2136}
2137
2138static int mmc_blk_mq_issue_rw_rq(struct mmc_queue *mq,
2139 struct request *req)
2140{
2141 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2142 struct mmc_host *host = mq->card->host;
2143 struct request *prev_req = NULL;
2144 int err = 0;
2145
2146 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
2147
2148 mqrq->brq.mrq.done = mmc_blk_mq_req_done;
2149
2150 mmc_pre_req(host, &mqrq->brq.mrq);
2151
2152 err = mmc_blk_rw_wait(mq, &prev_req);
2153 if (err)
2154 goto out_post_req;
2155
2156 mq->rw_wait = true;
2157
2158 err = mmc_start_request(host, &mqrq->brq.mrq);
2159
2160 if (prev_req)
2161 mmc_blk_mq_post_req(mq, prev_req);
2162
2163 if (err)
2164 mq->rw_wait = false;
2165
2166 /* Release re-tuning here where there is no synchronization required */
2167 if (err || mmc_host_done_complete(host))
2168 mmc_retune_release(host);
2169
2170out_post_req:
2171 if (err)
2172 mmc_post_req(host, &mqrq->brq.mrq, err);
2173
2174 return err;
2175}
2176
2177static int mmc_blk_wait_for_idle(struct mmc_queue *mq, struct mmc_host *host)
2178{
2179 if (mq->use_cqe)
2180 return host->cqe_ops->cqe_wait_for_idle(host);
2181
2182 return mmc_blk_rw_wait(mq, NULL);
2183}
2184
2185enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req)
2186{
2187 struct mmc_blk_data *md = mq->blkdata;
2188 struct mmc_card *card = md->queue.card;
2189 struct mmc_host *host = card->host;
2190 int ret;
2191
2192 ret = mmc_blk_part_switch(card, md->part_type);
2193 if (ret)
2194 return MMC_REQ_FAILED_TO_START;
2195
2196 switch (mmc_issue_type(mq, req)) {
2197 case MMC_ISSUE_SYNC:
2198 ret = mmc_blk_wait_for_idle(mq, host);
2199 if (ret)
2200 return MMC_REQ_BUSY;
2201 switch (req_op(req)) {
2202 case REQ_OP_DRV_IN:
2203 case REQ_OP_DRV_OUT:
2204 mmc_blk_issue_drv_op(mq, req);
2205 break;
2206 case REQ_OP_DISCARD:
2207 mmc_blk_issue_discard_rq(mq, req);
2208 break;
2209 case REQ_OP_SECURE_ERASE:
2210 mmc_blk_issue_secdiscard_rq(mq, req);
2211 break;
2212 case REQ_OP_FLUSH:
2213 mmc_blk_issue_flush(mq, req);
2214 break;
2215 default:
2216 WARN_ON_ONCE(1);
2217 return MMC_REQ_FAILED_TO_START;
2218 }
2219 return MMC_REQ_FINISHED;
2220 case MMC_ISSUE_DCMD:
2221 case MMC_ISSUE_ASYNC:
2222 switch (req_op(req)) {
2223 case REQ_OP_FLUSH:
2224 ret = mmc_blk_cqe_issue_flush(mq, req);
2225 break;
2226 case REQ_OP_READ:
2227 case REQ_OP_WRITE:
2228 if (mq->use_cqe)
2229 ret = mmc_blk_cqe_issue_rw_rq(mq, req);
2230 else
2231 ret = mmc_blk_mq_issue_rw_rq(mq, req);
2232 break;
2233 default:
2234 WARN_ON_ONCE(1);
2235 ret = -EINVAL;
2236 }
2237 if (!ret)
2238 return MMC_REQ_STARTED;
2239 return ret == -EBUSY ? MMC_REQ_BUSY : MMC_REQ_FAILED_TO_START;
2240 default:
2241 WARN_ON_ONCE(1);
2242 return MMC_REQ_FAILED_TO_START;
2243 }
2244}
2245
2246static inline int mmc_blk_readonly(struct mmc_card *card)
2247{
2248 return mmc_card_readonly(card) ||
2249 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2250}
2251
2252static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2253 struct device *parent,
2254 sector_t size,
2255 bool default_ro,
2256 const char *subname,
2257 int area_type)
2258{
2259 struct mmc_blk_data *md;
2260 int devidx, ret;
2261
2262 devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL);
2263 if (devidx < 0) {
2264 /*
2265 * We get -ENOSPC because there are no more any available
2266 * devidx. The reason may be that, either userspace haven't yet
2267 * unmounted the partitions, which postpones mmc_blk_release()
2268 * from being called, or the device has more partitions than
2269 * what we support.
2270 */
2271 if (devidx == -ENOSPC)
2272 dev_err(mmc_dev(card->host),
2273 "no more device IDs available\n");
2274
2275 return ERR_PTR(devidx);
2276 }
2277
2278 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2279 if (!md) {
2280 ret = -ENOMEM;
2281 goto out;
2282 }
2283
2284 md->area_type = area_type;
2285
2286 /*
2287 * Set the read-only status based on the supported commands
2288 * and the write protect switch.
2289 */
2290 md->read_only = mmc_blk_readonly(card);
2291
2292 md->disk = alloc_disk(perdev_minors);
2293 if (md->disk == NULL) {
2294 ret = -ENOMEM;
2295 goto err_kfree;
2296 }
2297
2298 INIT_LIST_HEAD(&md->part);
2299 INIT_LIST_HEAD(&md->rpmbs);
2300 md->usage = 1;
2301
2302 ret = mmc_init_queue(&md->queue, card);
2303 if (ret)
2304 goto err_putdisk;
2305
2306 md->queue.blkdata = md;
2307
2308 /*
2309 * Keep an extra reference to the queue so that we can shutdown the
2310 * queue (i.e. call blk_cleanup_queue()) while there are still
2311 * references to the 'md'. The corresponding blk_put_queue() is in
2312 * mmc_blk_put().
2313 */
2314 if (!blk_get_queue(md->queue.queue)) {
2315 mmc_cleanup_queue(&md->queue);
2316 ret = -ENODEV;
2317 goto err_putdisk;
2318 }
2319
2320 md->disk->major = MMC_BLOCK_MAJOR;
2321 md->disk->first_minor = devidx * perdev_minors;
2322 md->disk->fops = &mmc_bdops;
2323 md->disk->private_data = md;
2324 md->disk->queue = md->queue.queue;
2325 md->parent = parent;
2326 set_disk_ro(md->disk, md->read_only || default_ro);
2327 md->disk->flags = GENHD_FL_EXT_DEVT;
2328 if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2329 md->disk->flags |= GENHD_FL_NO_PART_SCAN
2330 | GENHD_FL_SUPPRESS_PARTITION_INFO;
2331
2332 /*
2333 * As discussed on lkml, GENHD_FL_REMOVABLE should:
2334 *
2335 * - be set for removable media with permanent block devices
2336 * - be unset for removable block devices with permanent media
2337 *
2338 * Since MMC block devices clearly fall under the second
2339 * case, we do not set GENHD_FL_REMOVABLE. Userspace
2340 * should use the block device creation/destruction hotplug
2341 * messages to tell when the card is present.
2342 */
2343
2344 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2345 "mmcblk%u%s", card->host->index, subname ? subname : "");
2346
2347 set_capacity(md->disk, size);
2348
2349 if (mmc_host_cmd23(card->host)) {
2350 if ((mmc_card_mmc(card) &&
2351 card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
2352 (mmc_card_sd(card) &&
2353 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2354 md->flags |= MMC_BLK_CMD23;
2355 }
2356
2357 if (mmc_card_mmc(card) &&
2358 md->flags & MMC_BLK_CMD23 &&
2359 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2360 card->ext_csd.rel_sectors)) {
2361 md->flags |= MMC_BLK_REL_WR;
2362 blk_queue_write_cache(md->queue.queue, true, true);
2363 }
2364
2365 return md;
2366
2367 err_putdisk:
2368 put_disk(md->disk);
2369 err_kfree:
2370 kfree(md);
2371 out:
2372 ida_simple_remove(&mmc_blk_ida, devidx);
2373 return ERR_PTR(ret);
2374}
2375
2376static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2377{
2378 sector_t size;
2379
2380 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2381 /*
2382 * The EXT_CSD sector count is in number or 512 byte
2383 * sectors.
2384 */
2385 size = card->ext_csd.sectors;
2386 } else {
2387 /*
2388 * The CSD capacity field is in units of read_blkbits.
2389 * set_capacity takes units of 512 bytes.
2390 */
2391 size = (typeof(sector_t))card->csd.capacity
2392 << (card->csd.read_blkbits - 9);
2393 }
2394
2395 return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2396 MMC_BLK_DATA_AREA_MAIN);
2397}
2398
2399static int mmc_blk_alloc_part(struct mmc_card *card,
2400 struct mmc_blk_data *md,
2401 unsigned int part_type,
2402 sector_t size,
2403 bool default_ro,
2404 const char *subname,
2405 int area_type)
2406{
2407 char cap_str[10];
2408 struct mmc_blk_data *part_md;
2409
2410 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2411 subname, area_type);
2412 if (IS_ERR(part_md))
2413 return PTR_ERR(part_md);
2414 part_md->part_type = part_type;
2415 list_add(&part_md->part, &md->part);
2416
2417 string_get_size((u64)get_capacity(part_md->disk), 512, STRING_UNITS_2,
2418 cap_str, sizeof(cap_str));
2419 pr_info("%s: %s %s partition %u %s\n",
2420 part_md->disk->disk_name, mmc_card_id(card),
2421 mmc_card_name(card), part_md->part_type, cap_str);
2422 return 0;
2423}
2424
2425/**
2426 * mmc_rpmb_ioctl() - ioctl handler for the RPMB chardev
2427 * @filp: the character device file
2428 * @cmd: the ioctl() command
2429 * @arg: the argument from userspace
2430 *
2431 * This will essentially just redirect the ioctl()s coming in over to
2432 * the main block device spawning the RPMB character device.
2433 */
2434static long mmc_rpmb_ioctl(struct file *filp, unsigned int cmd,
2435 unsigned long arg)
2436{
2437 struct mmc_rpmb_data *rpmb = filp->private_data;
2438 int ret;
2439
2440 switch (cmd) {
2441 case MMC_IOC_CMD:
2442 ret = mmc_blk_ioctl_cmd(rpmb->md,
2443 (struct mmc_ioc_cmd __user *)arg,
2444 rpmb);
2445 break;
2446 case MMC_IOC_MULTI_CMD:
2447 ret = mmc_blk_ioctl_multi_cmd(rpmb->md,
2448 (struct mmc_ioc_multi_cmd __user *)arg,
2449 rpmb);
2450 break;
2451 default:
2452 ret = -EINVAL;
2453 break;
2454 }
2455
2456 return ret;
2457}
2458
2459#ifdef CONFIG_COMPAT
2460static long mmc_rpmb_ioctl_compat(struct file *filp, unsigned int cmd,
2461 unsigned long arg)
2462{
2463 return mmc_rpmb_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
2464}
2465#endif
2466
2467static int mmc_rpmb_chrdev_open(struct inode *inode, struct file *filp)
2468{
2469 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2470 struct mmc_rpmb_data, chrdev);
2471
2472 get_device(&rpmb->dev);
2473 filp->private_data = rpmb;
2474 mmc_blk_get(rpmb->md->disk);
2475
2476 return nonseekable_open(inode, filp);
2477}
2478
2479static int mmc_rpmb_chrdev_release(struct inode *inode, struct file *filp)
2480{
2481 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2482 struct mmc_rpmb_data, chrdev);
2483
2484 mmc_blk_put(rpmb->md);
2485 put_device(&rpmb->dev);
2486
2487 return 0;
2488}
2489
2490static const struct file_operations mmc_rpmb_fileops = {
2491 .release = mmc_rpmb_chrdev_release,
2492 .open = mmc_rpmb_chrdev_open,
2493 .owner = THIS_MODULE,
2494 .llseek = no_llseek,
2495 .unlocked_ioctl = mmc_rpmb_ioctl,
2496#ifdef CONFIG_COMPAT
2497 .compat_ioctl = mmc_rpmb_ioctl_compat,
2498#endif
2499};
2500
2501static void mmc_blk_rpmb_device_release(struct device *dev)
2502{
2503 struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev);
2504
2505 ida_simple_remove(&mmc_rpmb_ida, rpmb->id);
2506 kfree(rpmb);
2507}
2508
2509static int mmc_blk_alloc_rpmb_part(struct mmc_card *card,
2510 struct mmc_blk_data *md,
2511 unsigned int part_index,
2512 sector_t size,
2513 const char *subname)
2514{
2515 int devidx, ret;
2516 char rpmb_name[DISK_NAME_LEN];
2517 char cap_str[10];
2518 struct mmc_rpmb_data *rpmb;
2519
2520 /* This creates the minor number for the RPMB char device */
2521 devidx = ida_simple_get(&mmc_rpmb_ida, 0, max_devices, GFP_KERNEL);
2522 if (devidx < 0)
2523 return devidx;
2524
2525 rpmb = kzalloc(sizeof(*rpmb), GFP_KERNEL);
2526 if (!rpmb) {
2527 ida_simple_remove(&mmc_rpmb_ida, devidx);
2528 return -ENOMEM;
2529 }
2530
2531 snprintf(rpmb_name, sizeof(rpmb_name),
2532 "mmcblk%u%s", card->host->index, subname ? subname : "");
2533
2534 rpmb->id = devidx;
2535 rpmb->part_index = part_index;
2536 rpmb->dev.init_name = rpmb_name;
2537 rpmb->dev.bus = &mmc_rpmb_bus_type;
2538 rpmb->dev.devt = MKDEV(MAJOR(mmc_rpmb_devt), rpmb->id);
2539 rpmb->dev.parent = &card->dev;
2540 rpmb->dev.release = mmc_blk_rpmb_device_release;
2541 device_initialize(&rpmb->dev);
2542 dev_set_drvdata(&rpmb->dev, rpmb);
2543 rpmb->md = md;
2544
2545 cdev_init(&rpmb->chrdev, &mmc_rpmb_fileops);
2546 rpmb->chrdev.owner = THIS_MODULE;
2547 ret = cdev_device_add(&rpmb->chrdev, &rpmb->dev);
2548 if (ret) {
2549 pr_err("%s: could not add character device\n", rpmb_name);
2550 goto out_put_device;
2551 }
2552
2553 list_add(&rpmb->node, &md->rpmbs);
2554
2555 string_get_size((u64)size, 512, STRING_UNITS_2,
2556 cap_str, sizeof(cap_str));
2557
2558 pr_info("%s: %s %s partition %u %s, chardev (%d:%d)\n",
2559 rpmb_name, mmc_card_id(card),
2560 mmc_card_name(card), EXT_CSD_PART_CONFIG_ACC_RPMB, cap_str,
2561 MAJOR(mmc_rpmb_devt), rpmb->id);
2562
2563 return 0;
2564
2565out_put_device:
2566 put_device(&rpmb->dev);
2567 return ret;
2568}
2569
2570static void mmc_blk_remove_rpmb_part(struct mmc_rpmb_data *rpmb)
2571
2572{
2573 cdev_device_del(&rpmb->chrdev, &rpmb->dev);
2574 put_device(&rpmb->dev);
2575}
2576
2577/* MMC Physical partitions consist of two boot partitions and
2578 * up to four general purpose partitions.
2579 * For each partition enabled in EXT_CSD a block device will be allocatedi
2580 * to provide access to the partition.
2581 */
2582
2583static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2584{
2585 int idx, ret;
2586
2587 if (!mmc_card_mmc(card))
2588 return 0;
2589
2590 for (idx = 0; idx < card->nr_parts; idx++) {
2591 if (card->part[idx].area_type & MMC_BLK_DATA_AREA_RPMB) {
2592 /*
2593 * RPMB partitions does not provide block access, they
2594 * are only accessed using ioctl():s. Thus create
2595 * special RPMB block devices that do not have a
2596 * backing block queue for these.
2597 */
2598 ret = mmc_blk_alloc_rpmb_part(card, md,
2599 card->part[idx].part_cfg,
2600 card->part[idx].size >> 9,
2601 card->part[idx].name);
2602 if (ret)
2603 return ret;
2604 } else if (card->part[idx].size) {
2605 ret = mmc_blk_alloc_part(card, md,
2606 card->part[idx].part_cfg,
2607 card->part[idx].size >> 9,
2608 card->part[idx].force_ro,
2609 card->part[idx].name,
2610 card->part[idx].area_type);
2611 if (ret)
2612 return ret;
2613 }
2614 }
2615
2616 return 0;
2617}
2618
2619static void mmc_blk_remove_req(struct mmc_blk_data *md)
2620{
2621 struct mmc_card *card;
2622
2623 if (md) {
2624 /*
2625 * Flush remaining requests and free queues. It
2626 * is freeing the queue that stops new requests
2627 * from being accepted.
2628 */
2629 card = md->queue.card;
2630 if (md->disk->flags & GENHD_FL_UP) {
2631 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2632 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2633 card->ext_csd.boot_ro_lockable)
2634 device_remove_file(disk_to_dev(md->disk),
2635 &md->power_ro_lock);
2636
2637 del_gendisk(md->disk);
2638 }
2639 mmc_cleanup_queue(&md->queue);
2640 mmc_blk_put(md);
2641 }
2642}
2643
2644static void mmc_blk_remove_parts(struct mmc_card *card,
2645 struct mmc_blk_data *md)
2646{
2647 struct list_head *pos, *q;
2648 struct mmc_blk_data *part_md;
2649 struct mmc_rpmb_data *rpmb;
2650
2651 /* Remove RPMB partitions */
2652 list_for_each_safe(pos, q, &md->rpmbs) {
2653 rpmb = list_entry(pos, struct mmc_rpmb_data, node);
2654 list_del(pos);
2655 mmc_blk_remove_rpmb_part(rpmb);
2656 }
2657 /* Remove block partitions */
2658 list_for_each_safe(pos, q, &md->part) {
2659 part_md = list_entry(pos, struct mmc_blk_data, part);
2660 list_del(pos);
2661 mmc_blk_remove_req(part_md);
2662 }
2663}
2664
2665static int mmc_add_disk(struct mmc_blk_data *md)
2666{
2667 int ret;
2668 struct mmc_card *card = md->queue.card;
2669
2670 device_add_disk(md->parent, md->disk, NULL);
2671 md->force_ro.show = force_ro_show;
2672 md->force_ro.store = force_ro_store;
2673 sysfs_attr_init(&md->force_ro.attr);
2674 md->force_ro.attr.name = "force_ro";
2675 md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2676 ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2677 if (ret)
2678 goto force_ro_fail;
2679
2680 if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2681 card->ext_csd.boot_ro_lockable) {
2682 umode_t mode;
2683
2684 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2685 mode = S_IRUGO;
2686 else
2687 mode = S_IRUGO | S_IWUSR;
2688
2689 md->power_ro_lock.show = power_ro_lock_show;
2690 md->power_ro_lock.store = power_ro_lock_store;
2691 sysfs_attr_init(&md->power_ro_lock.attr);
2692 md->power_ro_lock.attr.mode = mode;
2693 md->power_ro_lock.attr.name =
2694 "ro_lock_until_next_power_on";
2695 ret = device_create_file(disk_to_dev(md->disk),
2696 &md->power_ro_lock);
2697 if (ret)
2698 goto power_ro_lock_fail;
2699 }
2700 return ret;
2701
2702power_ro_lock_fail:
2703 device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2704force_ro_fail:
2705 del_gendisk(md->disk);
2706
2707 return ret;
2708}
2709
2710#ifdef CONFIG_DEBUG_FS
2711
2712static int mmc_dbg_card_status_get(void *data, u64 *val)
2713{
2714 struct mmc_card *card = data;
2715 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2716 struct mmc_queue *mq = &md->queue;
2717 struct request *req;
2718 int ret;
2719
2720 /* Ask the block layer about the card status */
2721 req = blk_get_request(mq->queue, REQ_OP_DRV_IN, 0);
2722 if (IS_ERR(req))
2723 return PTR_ERR(req);
2724 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_CARD_STATUS;
2725 blk_execute_rq(mq->queue, NULL, req, 0);
2726 ret = req_to_mmc_queue_req(req)->drv_op_result;
2727 if (ret >= 0) {
2728 *val = ret;
2729 ret = 0;
2730 }
2731 blk_put_request(req);
2732
2733 return ret;
2734}
2735DEFINE_DEBUGFS_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
2736 NULL, "%08llx\n");
2737
2738/* That is two digits * 512 + 1 for newline */
2739#define EXT_CSD_STR_LEN 1025
2740
2741static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
2742{
2743 struct mmc_card *card = inode->i_private;
2744 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2745 struct mmc_queue *mq = &md->queue;
2746 struct request *req;
2747 char *buf;
2748 ssize_t n = 0;
2749 u8 *ext_csd;
2750 int err, i;
2751
2752 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
2753 if (!buf)
2754 return -ENOMEM;
2755
2756 /* Ask the block layer for the EXT CSD */
2757 req = blk_get_request(mq->queue, REQ_OP_DRV_IN, 0);
2758 if (IS_ERR(req)) {
2759 err = PTR_ERR(req);
2760 goto out_free;
2761 }
2762 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_EXT_CSD;
2763 req_to_mmc_queue_req(req)->drv_op_data = &ext_csd;
2764 blk_execute_rq(mq->queue, NULL, req, 0);
2765 err = req_to_mmc_queue_req(req)->drv_op_result;
2766 blk_put_request(req);
2767 if (err) {
2768 pr_err("FAILED %d\n", err);
2769 goto out_free;
2770 }
2771
2772 for (i = 0; i < 512; i++)
2773 n += sprintf(buf + n, "%02x", ext_csd[i]);
2774 n += sprintf(buf + n, "\n");
2775
2776 if (n != EXT_CSD_STR_LEN) {
2777 err = -EINVAL;
2778 kfree(ext_csd);
2779 goto out_free;
2780 }
2781
2782 filp->private_data = buf;
2783 kfree(ext_csd);
2784 return 0;
2785
2786out_free:
2787 kfree(buf);
2788 return err;
2789}
2790
2791static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
2792 size_t cnt, loff_t *ppos)
2793{
2794 char *buf = filp->private_data;
2795
2796 return simple_read_from_buffer(ubuf, cnt, ppos,
2797 buf, EXT_CSD_STR_LEN);
2798}
2799
2800static int mmc_ext_csd_release(struct inode *inode, struct file *file)
2801{
2802 kfree(file->private_data);
2803 return 0;
2804}
2805
2806static const struct file_operations mmc_dbg_ext_csd_fops = {
2807 .open = mmc_ext_csd_open,
2808 .read = mmc_ext_csd_read,
2809 .release = mmc_ext_csd_release,
2810 .llseek = default_llseek,
2811};
2812
2813static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
2814{
2815 struct dentry *root;
2816
2817 if (!card->debugfs_root)
2818 return 0;
2819
2820 root = card->debugfs_root;
2821
2822 if (mmc_card_mmc(card) || mmc_card_sd(card)) {
2823 md->status_dentry =
2824 debugfs_create_file_unsafe("status", 0400, root,
2825 card,
2826 &mmc_dbg_card_status_fops);
2827 if (!md->status_dentry)
2828 return -EIO;
2829 }
2830
2831 if (mmc_card_mmc(card)) {
2832 md->ext_csd_dentry =
2833 debugfs_create_file("ext_csd", S_IRUSR, root, card,
2834 &mmc_dbg_ext_csd_fops);
2835 if (!md->ext_csd_dentry)
2836 return -EIO;
2837 }
2838
2839 return 0;
2840}
2841
2842static void mmc_blk_remove_debugfs(struct mmc_card *card,
2843 struct mmc_blk_data *md)
2844{
2845 if (!card->debugfs_root)
2846 return;
2847
2848 if (!IS_ERR_OR_NULL(md->status_dentry)) {
2849 debugfs_remove(md->status_dentry);
2850 md->status_dentry = NULL;
2851 }
2852
2853 if (!IS_ERR_OR_NULL(md->ext_csd_dentry)) {
2854 debugfs_remove(md->ext_csd_dentry);
2855 md->ext_csd_dentry = NULL;
2856 }
2857}
2858
2859#else
2860
2861static int mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
2862{
2863 return 0;
2864}
2865
2866static void mmc_blk_remove_debugfs(struct mmc_card *card,
2867 struct mmc_blk_data *md)
2868{
2869}
2870
2871#endif /* CONFIG_DEBUG_FS */
2872
2873static int mmc_blk_probe(struct mmc_card *card)
2874{
2875 struct mmc_blk_data *md, *part_md;
2876 char cap_str[10];
2877
2878 /*
2879 * Check that the card supports the command class(es) we need.
2880 */
2881 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2882 return -ENODEV;
2883
2884 mmc_fixup_device(card, mmc_blk_fixups);
2885
2886 card->complete_wq = alloc_workqueue("mmc_complete",
2887 WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
2888 if (unlikely(!card->complete_wq)) {
2889 pr_err("Failed to create mmc completion workqueue");
2890 return -ENOMEM;
2891 }
2892
2893 md = mmc_blk_alloc(card);
2894 if (IS_ERR(md))
2895 return PTR_ERR(md);
2896
2897 string_get_size((u64)get_capacity(md->disk), 512, STRING_UNITS_2,
2898 cap_str, sizeof(cap_str));
2899 pr_info("%s: %s %s %s %s\n",
2900 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2901 cap_str, md->read_only ? "(ro)" : "");
2902
2903 if (mmc_blk_alloc_parts(card, md))
2904 goto out;
2905
2906 dev_set_drvdata(&card->dev, md);
2907
2908 if (mmc_add_disk(md))
2909 goto out;
2910
2911 list_for_each_entry(part_md, &md->part, part) {
2912 if (mmc_add_disk(part_md))
2913 goto out;
2914 }
2915
2916 /* Add two debugfs entries */
2917 mmc_blk_add_debugfs(card, md);
2918
2919 pm_runtime_set_autosuspend_delay(&card->dev, 3000);
2920 pm_runtime_use_autosuspend(&card->dev);
2921
2922 /*
2923 * Don't enable runtime PM for SD-combo cards here. Leave that
2924 * decision to be taken during the SDIO init sequence instead.
2925 */
2926 if (card->type != MMC_TYPE_SD_COMBO) {
2927 pm_runtime_set_active(&card->dev);
2928 pm_runtime_enable(&card->dev);
2929 }
2930
2931 return 0;
2932
2933 out:
2934 mmc_blk_remove_parts(card, md);
2935 mmc_blk_remove_req(md);
2936 return 0;
2937}
2938
2939static void mmc_blk_remove(struct mmc_card *card)
2940{
2941 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2942
2943 mmc_blk_remove_debugfs(card, md);
2944 mmc_blk_remove_parts(card, md);
2945 pm_runtime_get_sync(&card->dev);
2946 if (md->part_curr != md->part_type) {
2947 mmc_claim_host(card->host);
2948 mmc_blk_part_switch(card, md->part_type);
2949 mmc_release_host(card->host);
2950 }
2951 if (card->type != MMC_TYPE_SD_COMBO)
2952 pm_runtime_disable(&card->dev);
2953 pm_runtime_put_noidle(&card->dev);
2954 mmc_blk_remove_req(md);
2955 dev_set_drvdata(&card->dev, NULL);
2956 destroy_workqueue(card->complete_wq);
2957}
2958
2959static int _mmc_blk_suspend(struct mmc_card *card)
2960{
2961 struct mmc_blk_data *part_md;
2962 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2963
2964 if (md) {
2965 mmc_queue_suspend(&md->queue);
2966 list_for_each_entry(part_md, &md->part, part) {
2967 mmc_queue_suspend(&part_md->queue);
2968 }
2969 }
2970 return 0;
2971}
2972
2973static void mmc_blk_shutdown(struct mmc_card *card)
2974{
2975 _mmc_blk_suspend(card);
2976}
2977
2978#ifdef CONFIG_PM_SLEEP
2979static int mmc_blk_suspend(struct device *dev)
2980{
2981 struct mmc_card *card = mmc_dev_to_card(dev);
2982
2983 return _mmc_blk_suspend(card);
2984}
2985
2986static int mmc_blk_resume(struct device *dev)
2987{
2988 struct mmc_blk_data *part_md;
2989 struct mmc_blk_data *md = dev_get_drvdata(dev);
2990
2991 if (md) {
2992 /*
2993 * Resume involves the card going into idle state,
2994 * so current partition is always the main one.
2995 */
2996 md->part_curr = md->part_type;
2997 mmc_queue_resume(&md->queue);
2998 list_for_each_entry(part_md, &md->part, part) {
2999 mmc_queue_resume(&part_md->queue);
3000 }
3001 }
3002 return 0;
3003}
3004#endif
3005
3006static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
3007
3008static struct mmc_driver mmc_driver = {
3009 .drv = {
3010 .name = "mmcblk",
3011 .pm = &mmc_blk_pm_ops,
3012 },
3013 .probe = mmc_blk_probe,
3014 .remove = mmc_blk_remove,
3015 .shutdown = mmc_blk_shutdown,
3016};
3017
3018static int __init mmc_blk_init(void)
3019{
3020 int res;
3021
3022 res = bus_register(&mmc_rpmb_bus_type);
3023 if (res < 0) {
3024 pr_err("mmcblk: could not register RPMB bus type\n");
3025 return res;
3026 }
3027 res = alloc_chrdev_region(&mmc_rpmb_devt, 0, MAX_DEVICES, "rpmb");
3028 if (res < 0) {
3029 pr_err("mmcblk: failed to allocate rpmb chrdev region\n");
3030 goto out_bus_unreg;
3031 }
3032
3033 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
3034 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
3035
3036 max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
3037
3038 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
3039 if (res)
3040 goto out_chrdev_unreg;
3041
3042 res = mmc_register_driver(&mmc_driver);
3043 if (res)
3044 goto out_blkdev_unreg;
3045
3046 return 0;
3047
3048out_blkdev_unreg:
3049 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3050out_chrdev_unreg:
3051 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3052out_bus_unreg:
3053 bus_unregister(&mmc_rpmb_bus_type);
3054 return res;
3055}
3056
3057static void __exit mmc_blk_exit(void)
3058{
3059 mmc_unregister_driver(&mmc_driver);
3060 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3061 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3062 bus_unregister(&mmc_rpmb_bus_type);
3063}
3064
3065module_init(mmc_blk_init);
3066module_exit(mmc_blk_exit);
3067
3068MODULE_LICENSE("GPL");
3069MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
3070