Loading...
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.h>
37#include <linux/string_helpers.h>
38#include <linux/delay.h>
39#include <linux/capability.h>
40#include <linux/compat.h>
41#include <linux/pm_runtime.h>
42#include <linux/idr.h>
43#include <linux/debugfs.h>
44#include <linux/rpmb.h>
45
46#include <linux/mmc/ioctl.h>
47#include <linux/mmc/card.h>
48#include <linux/mmc/host.h>
49#include <linux/mmc/mmc.h>
50#include <linux/mmc/sd.h>
51
52#include <linux/uaccess.h>
53#include <linux/unaligned.h>
54
55#include "queue.h"
56#include "block.h"
57#include "core.h"
58#include "card.h"
59#include "crypto.h"
60#include "host.h"
61#include "bus.h"
62#include "mmc_ops.h"
63#include "quirks.h"
64#include "sd_ops.h"
65
66MODULE_ALIAS("mmc:block");
67#ifdef MODULE_PARAM_PREFIX
68#undef MODULE_PARAM_PREFIX
69#endif
70#define MODULE_PARAM_PREFIX "mmcblk."
71
72/*
73 * Set a 10 second timeout for polling write request busy state. Note, mmc core
74 * is setting a 3 second timeout for SD cards, and SDHCI has long had a 10
75 * second software timer to timeout the whole request, so 10 seconds should be
76 * ample.
77 */
78#define MMC_BLK_TIMEOUT_MS (10 * 1000)
79#define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
80#define MMC_EXTRACT_VALUE_FROM_ARG(x) ((x & 0x0000FF00) >> 8)
81
82/**
83 * struct rpmb_frame - rpmb frame as defined by eMMC 5.1 (JESD84-B51)
84 *
85 * @stuff : stuff bytes
86 * @key_mac : The authentication key or the message authentication
87 * code (MAC) depending on the request/response type.
88 * The MAC will be delivered in the last (or the only)
89 * block of data.
90 * @data : Data to be written or read by signed access.
91 * @nonce : Random number generated by the host for the requests
92 * and copied to the response by the RPMB engine.
93 * @write_counter: Counter value for the total amount of the successful
94 * authenticated data write requests made by the host.
95 * @addr : Address of the data to be programmed to or read
96 * from the RPMB. Address is the serial number of
97 * the accessed block (half sector 256B).
98 * @block_count : Number of blocks (half sectors, 256B) requested to be
99 * read/programmed.
100 * @result : Includes information about the status of the write counter
101 * (valid, expired) and result of the access made to the RPMB.
102 * @req_resp : Defines the type of request and response to/from the memory.
103 *
104 * The stuff bytes and big-endian properties are modeled to fit to the spec.
105 */
106struct rpmb_frame {
107 u8 stuff[196];
108 u8 key_mac[32];
109 u8 data[256];
110 u8 nonce[16];
111 __be32 write_counter;
112 __be16 addr;
113 __be16 block_count;
114 __be16 result;
115 __be16 req_resp;
116} __packed;
117
118#define RPMB_PROGRAM_KEY 0x1 /* Program RPMB Authentication Key */
119#define RPMB_GET_WRITE_COUNTER 0x2 /* Read RPMB write counter */
120#define RPMB_WRITE_DATA 0x3 /* Write data to RPMB partition */
121#define RPMB_READ_DATA 0x4 /* Read data from RPMB partition */
122#define RPMB_RESULT_READ 0x5 /* Read result request (Internal) */
123
124static DEFINE_MUTEX(block_mutex);
125
126/*
127 * The defaults come from config options but can be overriden by module
128 * or bootarg options.
129 */
130static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
131
132/*
133 * We've only got one major, so number of mmcblk devices is
134 * limited to (1 << 20) / number of minors per device. It is also
135 * limited by the MAX_DEVICES below.
136 */
137static int max_devices;
138
139#define MAX_DEVICES 256
140
141static DEFINE_IDA(mmc_blk_ida);
142static DEFINE_IDA(mmc_rpmb_ida);
143
144struct mmc_blk_busy_data {
145 struct mmc_card *card;
146 u32 status;
147};
148
149/*
150 * There is one mmc_blk_data per slot.
151 */
152struct mmc_blk_data {
153 struct device *parent;
154 struct gendisk *disk;
155 struct mmc_queue queue;
156 struct list_head part;
157 struct list_head rpmbs;
158
159 unsigned int flags;
160#define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
161#define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */
162
163 struct kref kref;
164 unsigned int read_only;
165 unsigned int part_type;
166 unsigned int reset_done;
167#define MMC_BLK_READ BIT(0)
168#define MMC_BLK_WRITE BIT(1)
169#define MMC_BLK_DISCARD BIT(2)
170#define MMC_BLK_SECDISCARD BIT(3)
171#define MMC_BLK_CQE_RECOVERY BIT(4)
172#define MMC_BLK_TRIM BIT(5)
173
174 /*
175 * Only set in main mmc_blk_data associated
176 * with mmc_card with dev_set_drvdata, and keeps
177 * track of the current selected device partition.
178 */
179 unsigned int part_curr;
180#define MMC_BLK_PART_INVALID UINT_MAX /* Unknown partition active */
181 int area_type;
182
183 /* debugfs files (only in main mmc_blk_data) */
184 struct dentry *status_dentry;
185 struct dentry *ext_csd_dentry;
186};
187
188/* Device type for RPMB character devices */
189static dev_t mmc_rpmb_devt;
190
191/* Bus type for RPMB character devices */
192static const struct bus_type mmc_rpmb_bus_type = {
193 .name = "mmc_rpmb",
194};
195
196/**
197 * struct mmc_rpmb_data - special RPMB device type for these areas
198 * @dev: the device for the RPMB area
199 * @chrdev: character device for the RPMB area
200 * @id: unique device ID number
201 * @part_index: partition index (0 on first)
202 * @md: parent MMC block device
203 * @rdev: registered RPMB device
204 * @node: list item, so we can put this device on a list
205 */
206struct mmc_rpmb_data {
207 struct device dev;
208 struct cdev chrdev;
209 int id;
210 unsigned int part_index;
211 struct mmc_blk_data *md;
212 struct rpmb_dev *rdev;
213 struct list_head node;
214};
215
216static DEFINE_MUTEX(open_lock);
217
218module_param(perdev_minors, int, 0444);
219MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
220
221static inline int mmc_blk_part_switch(struct mmc_card *card,
222 unsigned int part_type);
223static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
224 struct mmc_card *card,
225 int recovery_mode,
226 struct mmc_queue *mq);
227static void mmc_blk_hsq_req_done(struct mmc_request *mrq);
228static int mmc_spi_err_check(struct mmc_card *card);
229static int mmc_blk_busy_cb(void *cb_data, bool *busy);
230
231static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
232{
233 struct mmc_blk_data *md;
234
235 mutex_lock(&open_lock);
236 md = disk->private_data;
237 if (md && !kref_get_unless_zero(&md->kref))
238 md = NULL;
239 mutex_unlock(&open_lock);
240
241 return md;
242}
243
244static inline int mmc_get_devidx(struct gendisk *disk)
245{
246 int devidx = disk->first_minor / perdev_minors;
247 return devidx;
248}
249
250static void mmc_blk_kref_release(struct kref *ref)
251{
252 struct mmc_blk_data *md = container_of(ref, struct mmc_blk_data, kref);
253 int devidx;
254
255 devidx = mmc_get_devidx(md->disk);
256 ida_free(&mmc_blk_ida, devidx);
257
258 mutex_lock(&open_lock);
259 md->disk->private_data = NULL;
260 mutex_unlock(&open_lock);
261
262 put_disk(md->disk);
263 kfree(md);
264}
265
266static void mmc_blk_put(struct mmc_blk_data *md)
267{
268 kref_put(&md->kref, mmc_blk_kref_release);
269}
270
271static ssize_t power_ro_lock_show(struct device *dev,
272 struct device_attribute *attr, char *buf)
273{
274 int ret;
275 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
276 struct mmc_card *card = md->queue.card;
277 int locked = 0;
278
279 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
280 locked = 2;
281 else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
282 locked = 1;
283
284 ret = sysfs_emit(buf, "%d\n", locked);
285
286 mmc_blk_put(md);
287
288 return ret;
289}
290
291static ssize_t power_ro_lock_store(struct device *dev,
292 struct device_attribute *attr, const char *buf, size_t count)
293{
294 int ret;
295 struct mmc_blk_data *md, *part_md;
296 struct mmc_queue *mq;
297 struct request *req;
298 unsigned long set;
299
300 if (kstrtoul(buf, 0, &set))
301 return -EINVAL;
302
303 if (set != 1)
304 return count;
305
306 md = mmc_blk_get(dev_to_disk(dev));
307 mq = &md->queue;
308
309 /* Dispatch locking to the block layer */
310 req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_OUT, 0);
311 if (IS_ERR(req)) {
312 count = PTR_ERR(req);
313 goto out_put;
314 }
315 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_BOOT_WP;
316 req_to_mmc_queue_req(req)->drv_op_result = -EIO;
317 blk_execute_rq(req, false);
318 ret = req_to_mmc_queue_req(req)->drv_op_result;
319 blk_mq_free_request(req);
320
321 if (!ret) {
322 pr_info("%s: Locking boot partition ro until next power on\n",
323 md->disk->disk_name);
324 set_disk_ro(md->disk, 1);
325
326 list_for_each_entry(part_md, &md->part, part)
327 if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
328 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
329 set_disk_ro(part_md->disk, 1);
330 }
331 }
332out_put:
333 mmc_blk_put(md);
334 return count;
335}
336
337static DEVICE_ATTR(ro_lock_until_next_power_on, 0,
338 power_ro_lock_show, power_ro_lock_store);
339
340static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
341 char *buf)
342{
343 int ret;
344 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
345
346 ret = sysfs_emit(buf, "%d\n",
347 get_disk_ro(dev_to_disk(dev)) ^
348 md->read_only);
349 mmc_blk_put(md);
350 return ret;
351}
352
353static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
354 const char *buf, size_t count)
355{
356 int ret;
357 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
358 unsigned long set;
359
360 if (kstrtoul(buf, 0, &set)) {
361 ret = -EINVAL;
362 goto out;
363 }
364
365 set_disk_ro(dev_to_disk(dev), set || md->read_only);
366 ret = count;
367out:
368 mmc_blk_put(md);
369 return ret;
370}
371
372static DEVICE_ATTR(force_ro, 0644, force_ro_show, force_ro_store);
373
374static struct attribute *mmc_disk_attrs[] = {
375 &dev_attr_force_ro.attr,
376 &dev_attr_ro_lock_until_next_power_on.attr,
377 NULL,
378};
379
380static umode_t mmc_disk_attrs_is_visible(struct kobject *kobj,
381 struct attribute *a, int n)
382{
383 struct device *dev = kobj_to_dev(kobj);
384 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
385 umode_t mode = a->mode;
386
387 if (a == &dev_attr_ro_lock_until_next_power_on.attr &&
388 (md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
389 md->queue.card->ext_csd.boot_ro_lockable) {
390 mode = S_IRUGO;
391 if (!(md->queue.card->ext_csd.boot_ro_lock &
392 EXT_CSD_BOOT_WP_B_PWR_WP_DIS))
393 mode |= S_IWUSR;
394 }
395
396 mmc_blk_put(md);
397 return mode;
398}
399
400static const struct attribute_group mmc_disk_attr_group = {
401 .is_visible = mmc_disk_attrs_is_visible,
402 .attrs = mmc_disk_attrs,
403};
404
405static const struct attribute_group *mmc_disk_attr_groups[] = {
406 &mmc_disk_attr_group,
407 NULL,
408};
409
410static int mmc_blk_open(struct gendisk *disk, blk_mode_t mode)
411{
412 struct mmc_blk_data *md = mmc_blk_get(disk);
413 int ret = -ENXIO;
414
415 mutex_lock(&block_mutex);
416 if (md) {
417 ret = 0;
418 if ((mode & BLK_OPEN_WRITE) && md->read_only) {
419 mmc_blk_put(md);
420 ret = -EROFS;
421 }
422 }
423 mutex_unlock(&block_mutex);
424
425 return ret;
426}
427
428static void mmc_blk_release(struct gendisk *disk)
429{
430 struct mmc_blk_data *md = disk->private_data;
431
432 mutex_lock(&block_mutex);
433 mmc_blk_put(md);
434 mutex_unlock(&block_mutex);
435}
436
437static int
438mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
439{
440 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
441 geo->heads = 4;
442 geo->sectors = 16;
443 return 0;
444}
445
446struct mmc_blk_ioc_data {
447 struct mmc_ioc_cmd ic;
448 unsigned char *buf;
449 u64 buf_bytes;
450 unsigned int flags;
451#define MMC_BLK_IOC_DROP BIT(0) /* drop this mrq */
452#define MMC_BLK_IOC_SBC BIT(1) /* use mrq.sbc */
453
454 struct mmc_rpmb_data *rpmb;
455};
456
457static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
458 struct mmc_ioc_cmd __user *user)
459{
460 struct mmc_blk_ioc_data *idata;
461 int err;
462
463 idata = kzalloc(sizeof(*idata), GFP_KERNEL);
464 if (!idata) {
465 err = -ENOMEM;
466 goto out;
467 }
468
469 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
470 err = -EFAULT;
471 goto idata_err;
472 }
473
474 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
475 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
476 err = -EOVERFLOW;
477 goto idata_err;
478 }
479
480 if (!idata->buf_bytes) {
481 idata->buf = NULL;
482 return idata;
483 }
484
485 idata->buf = memdup_user((void __user *)(unsigned long)
486 idata->ic.data_ptr, idata->buf_bytes);
487 if (IS_ERR(idata->buf)) {
488 err = PTR_ERR(idata->buf);
489 goto idata_err;
490 }
491
492 return idata;
493
494idata_err:
495 kfree(idata);
496out:
497 return ERR_PTR(err);
498}
499
500static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
501 struct mmc_blk_ioc_data *idata)
502{
503 struct mmc_ioc_cmd *ic = &idata->ic;
504
505 if (copy_to_user(&(ic_ptr->response), ic->response,
506 sizeof(ic->response)))
507 return -EFAULT;
508
509 if (!idata->ic.write_flag) {
510 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
511 idata->buf, idata->buf_bytes))
512 return -EFAULT;
513 }
514
515 return 0;
516}
517
518static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
519 struct mmc_blk_ioc_data **idatas, int i)
520{
521 struct mmc_command cmd = {}, sbc = {};
522 struct mmc_data data = {};
523 struct mmc_request mrq = {};
524 struct scatterlist sg;
525 bool r1b_resp;
526 unsigned int busy_timeout_ms;
527 int err;
528 unsigned int target_part;
529 struct mmc_blk_ioc_data *idata = idatas[i];
530 struct mmc_blk_ioc_data *prev_idata = NULL;
531
532 if (!card || !md || !idata)
533 return -EINVAL;
534
535 if (idata->flags & MMC_BLK_IOC_DROP)
536 return 0;
537
538 if (idata->flags & MMC_BLK_IOC_SBC && i > 0)
539 prev_idata = idatas[i - 1];
540
541 /*
542 * The RPMB accesses comes in from the character device, so we
543 * need to target these explicitly. Else we just target the
544 * partition type for the block device the ioctl() was issued
545 * on.
546 */
547 if (idata->rpmb) {
548 /* Support multiple RPMB partitions */
549 target_part = idata->rpmb->part_index;
550 target_part |= EXT_CSD_PART_CONFIG_ACC_RPMB;
551 } else {
552 target_part = md->part_type;
553 }
554
555 cmd.opcode = idata->ic.opcode;
556 cmd.arg = idata->ic.arg;
557 cmd.flags = idata->ic.flags;
558
559 if (idata->buf_bytes) {
560 data.sg = &sg;
561 data.sg_len = 1;
562 data.blksz = idata->ic.blksz;
563 data.blocks = idata->ic.blocks;
564
565 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
566
567 if (idata->ic.write_flag)
568 data.flags = MMC_DATA_WRITE;
569 else
570 data.flags = MMC_DATA_READ;
571
572 /* data.flags must already be set before doing this. */
573 mmc_set_data_timeout(&data, card);
574
575 /* Allow overriding the timeout_ns for empirical tuning. */
576 if (idata->ic.data_timeout_ns)
577 data.timeout_ns = idata->ic.data_timeout_ns;
578
579 mrq.data = &data;
580 }
581
582 mrq.cmd = &cmd;
583
584 err = mmc_blk_part_switch(card, target_part);
585 if (err)
586 return err;
587
588 if (idata->ic.is_acmd) {
589 err = mmc_app_cmd(card->host, card);
590 if (err)
591 return err;
592 }
593
594 if (idata->rpmb || prev_idata) {
595 sbc.opcode = MMC_SET_BLOCK_COUNT;
596 /*
597 * We don't do any blockcount validation because the max size
598 * may be increased by a future standard. We just copy the
599 * 'Reliable Write' bit here.
600 */
601 sbc.arg = data.blocks | (idata->ic.write_flag & BIT(31));
602 if (prev_idata)
603 sbc.arg = prev_idata->ic.arg;
604 sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
605 mrq.sbc = &sbc;
606 }
607
608 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
609 (cmd.opcode == MMC_SWITCH))
610 return mmc_sanitize(card, idata->ic.cmd_timeout_ms);
611
612 /* If it's an R1B response we need some more preparations. */
613 busy_timeout_ms = idata->ic.cmd_timeout_ms ? : MMC_BLK_TIMEOUT_MS;
614 r1b_resp = (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B;
615 if (r1b_resp)
616 mmc_prepare_busy_cmd(card->host, &cmd, busy_timeout_ms);
617
618 mmc_wait_for_req(card->host, &mrq);
619 memcpy(&idata->ic.response, cmd.resp, sizeof(cmd.resp));
620
621 if (prev_idata) {
622 memcpy(&prev_idata->ic.response, sbc.resp, sizeof(sbc.resp));
623 if (sbc.error) {
624 dev_err(mmc_dev(card->host), "%s: sbc error %d\n",
625 __func__, sbc.error);
626 return sbc.error;
627 }
628 }
629
630 if (cmd.error) {
631 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
632 __func__, cmd.error);
633 return cmd.error;
634 }
635 if (data.error) {
636 dev_err(mmc_dev(card->host), "%s: data error %d\n",
637 __func__, data.error);
638 return data.error;
639 }
640
641 /*
642 * Make sure the cache of the PARTITION_CONFIG register and
643 * PARTITION_ACCESS bits is updated in case the ioctl ext_csd write
644 * changed it successfully.
645 */
646 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_PART_CONFIG) &&
647 (cmd.opcode == MMC_SWITCH)) {
648 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
649 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg);
650
651 /*
652 * Update cache so the next mmc_blk_part_switch call operates
653 * on up-to-date data.
654 */
655 card->ext_csd.part_config = value;
656 main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK;
657 }
658
659 /*
660 * Make sure to update CACHE_CTRL in case it was changed. The cache
661 * will get turned back on if the card is re-initialized, e.g.
662 * suspend/resume or hw reset in recovery.
663 */
664 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_CACHE_CTRL) &&
665 (cmd.opcode == MMC_SWITCH)) {
666 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg) & 1;
667
668 card->ext_csd.cache_ctrl = value;
669 }
670
671 /*
672 * According to the SD specs, some commands require a delay after
673 * issuing the command.
674 */
675 if (idata->ic.postsleep_min_us)
676 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
677
678 if (mmc_host_is_spi(card->host)) {
679 if (idata->ic.write_flag || r1b_resp || cmd.flags & MMC_RSP_SPI_BUSY)
680 return mmc_spi_err_check(card);
681 return err;
682 }
683
684 /*
685 * Ensure RPMB, writes and R1B responses are completed by polling with
686 * CMD13. Note that, usually we don't need to poll when using HW busy
687 * detection, but here it's needed since some commands may indicate the
688 * error through the R1 status bits.
689 */
690 if (idata->rpmb || idata->ic.write_flag || r1b_resp) {
691 struct mmc_blk_busy_data cb_data = {
692 .card = card,
693 };
694
695 err = __mmc_poll_for_busy(card->host, 0, busy_timeout_ms,
696 &mmc_blk_busy_cb, &cb_data);
697
698 idata->ic.response[0] = cb_data.status;
699 }
700
701 return err;
702}
703
704static int mmc_blk_ioctl_cmd(struct mmc_blk_data *md,
705 struct mmc_ioc_cmd __user *ic_ptr,
706 struct mmc_rpmb_data *rpmb)
707{
708 struct mmc_blk_ioc_data *idata;
709 struct mmc_blk_ioc_data *idatas[1];
710 struct mmc_queue *mq;
711 struct mmc_card *card;
712 int err = 0, ioc_err = 0;
713 struct request *req;
714
715 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
716 if (IS_ERR(idata))
717 return PTR_ERR(idata);
718 /* This will be NULL on non-RPMB ioctl():s */
719 idata->rpmb = rpmb;
720
721 card = md->queue.card;
722 if (IS_ERR(card)) {
723 err = PTR_ERR(card);
724 goto cmd_done;
725 }
726
727 /*
728 * Dispatch the ioctl() into the block request queue.
729 */
730 mq = &md->queue;
731 req = blk_mq_alloc_request(mq->queue,
732 idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
733 if (IS_ERR(req)) {
734 err = PTR_ERR(req);
735 goto cmd_done;
736 }
737 idatas[0] = idata;
738 req_to_mmc_queue_req(req)->drv_op =
739 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
740 req_to_mmc_queue_req(req)->drv_op_result = -EIO;
741 req_to_mmc_queue_req(req)->drv_op_data = idatas;
742 req_to_mmc_queue_req(req)->ioc_count = 1;
743 blk_execute_rq(req, false);
744 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
745 err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
746 blk_mq_free_request(req);
747
748cmd_done:
749 kfree(idata->buf);
750 kfree(idata);
751 return ioc_err ? ioc_err : err;
752}
753
754static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md,
755 struct mmc_ioc_multi_cmd __user *user,
756 struct mmc_rpmb_data *rpmb)
757{
758 struct mmc_blk_ioc_data **idata = NULL;
759 struct mmc_ioc_cmd __user *cmds = user->cmds;
760 struct mmc_card *card;
761 struct mmc_queue *mq;
762 int err = 0, ioc_err = 0;
763 __u64 num_of_cmds;
764 unsigned int i, n;
765 struct request *req;
766
767 if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
768 sizeof(num_of_cmds)))
769 return -EFAULT;
770
771 if (!num_of_cmds)
772 return 0;
773
774 if (num_of_cmds > MMC_IOC_MAX_CMDS)
775 return -EINVAL;
776
777 n = num_of_cmds;
778 idata = kcalloc(n, sizeof(*idata), GFP_KERNEL);
779 if (!idata)
780 return -ENOMEM;
781
782 for (i = 0; i < n; i++) {
783 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
784 if (IS_ERR(idata[i])) {
785 err = PTR_ERR(idata[i]);
786 n = i;
787 goto cmd_err;
788 }
789 /* This will be NULL on non-RPMB ioctl():s */
790 idata[i]->rpmb = rpmb;
791 }
792
793 card = md->queue.card;
794 if (IS_ERR(card)) {
795 err = PTR_ERR(card);
796 goto cmd_err;
797 }
798
799
800 /*
801 * Dispatch the ioctl()s into the block request queue.
802 */
803 mq = &md->queue;
804 req = blk_mq_alloc_request(mq->queue,
805 idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
806 if (IS_ERR(req)) {
807 err = PTR_ERR(req);
808 goto cmd_err;
809 }
810 req_to_mmc_queue_req(req)->drv_op =
811 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
812 req_to_mmc_queue_req(req)->drv_op_result = -EIO;
813 req_to_mmc_queue_req(req)->drv_op_data = idata;
814 req_to_mmc_queue_req(req)->ioc_count = n;
815 blk_execute_rq(req, false);
816 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
817
818 /* copy to user if data and response */
819 for (i = 0; i < n && !err; i++)
820 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
821
822 blk_mq_free_request(req);
823
824cmd_err:
825 for (i = 0; i < n; i++) {
826 kfree(idata[i]->buf);
827 kfree(idata[i]);
828 }
829 kfree(idata);
830 return ioc_err ? ioc_err : err;
831}
832
833static int mmc_blk_check_blkdev(struct block_device *bdev)
834{
835 /*
836 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
837 * whole block device, not on a partition. This prevents overspray
838 * between sibling partitions.
839 */
840 if (!capable(CAP_SYS_RAWIO) || bdev_is_partition(bdev))
841 return -EPERM;
842 return 0;
843}
844
845static int mmc_blk_ioctl(struct block_device *bdev, blk_mode_t mode,
846 unsigned int cmd, unsigned long arg)
847{
848 struct mmc_blk_data *md;
849 int ret;
850
851 switch (cmd) {
852 case MMC_IOC_CMD:
853 ret = mmc_blk_check_blkdev(bdev);
854 if (ret)
855 return ret;
856 md = mmc_blk_get(bdev->bd_disk);
857 if (!md)
858 return -EINVAL;
859 ret = mmc_blk_ioctl_cmd(md,
860 (struct mmc_ioc_cmd __user *)arg,
861 NULL);
862 mmc_blk_put(md);
863 return ret;
864 case MMC_IOC_MULTI_CMD:
865 ret = mmc_blk_check_blkdev(bdev);
866 if (ret)
867 return ret;
868 md = mmc_blk_get(bdev->bd_disk);
869 if (!md)
870 return -EINVAL;
871 ret = mmc_blk_ioctl_multi_cmd(md,
872 (struct mmc_ioc_multi_cmd __user *)arg,
873 NULL);
874 mmc_blk_put(md);
875 return ret;
876 default:
877 return -EINVAL;
878 }
879}
880
881#ifdef CONFIG_COMPAT
882static int mmc_blk_compat_ioctl(struct block_device *bdev, blk_mode_t mode,
883 unsigned int cmd, unsigned long arg)
884{
885 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
886}
887#endif
888
889static int mmc_blk_alternative_gpt_sector(struct gendisk *disk,
890 sector_t *sector)
891{
892 struct mmc_blk_data *md;
893 int ret;
894
895 md = mmc_blk_get(disk);
896 if (!md)
897 return -EINVAL;
898
899 if (md->queue.card)
900 ret = mmc_card_alternative_gpt_sector(md->queue.card, sector);
901 else
902 ret = -ENODEV;
903
904 mmc_blk_put(md);
905
906 return ret;
907}
908
909static const struct block_device_operations mmc_bdops = {
910 .open = mmc_blk_open,
911 .release = mmc_blk_release,
912 .getgeo = mmc_blk_getgeo,
913 .owner = THIS_MODULE,
914 .ioctl = mmc_blk_ioctl,
915#ifdef CONFIG_COMPAT
916 .compat_ioctl = mmc_blk_compat_ioctl,
917#endif
918 .alternative_gpt_sector = mmc_blk_alternative_gpt_sector,
919};
920
921static int mmc_blk_part_switch_pre(struct mmc_card *card,
922 unsigned int part_type)
923{
924 const unsigned int mask = EXT_CSD_PART_CONFIG_ACC_MASK;
925 const unsigned int rpmb = EXT_CSD_PART_CONFIG_ACC_RPMB;
926 int ret = 0;
927
928 if ((part_type & mask) == rpmb) {
929 if (card->ext_csd.cmdq_en) {
930 ret = mmc_cmdq_disable(card);
931 if (ret)
932 return ret;
933 }
934 mmc_retune_pause(card->host);
935 }
936
937 return ret;
938}
939
940static int mmc_blk_part_switch_post(struct mmc_card *card,
941 unsigned int part_type)
942{
943 const unsigned int mask = EXT_CSD_PART_CONFIG_ACC_MASK;
944 const unsigned int rpmb = EXT_CSD_PART_CONFIG_ACC_RPMB;
945 int ret = 0;
946
947 if ((part_type & mask) == rpmb) {
948 mmc_retune_unpause(card->host);
949 if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
950 ret = mmc_cmdq_enable(card);
951 }
952
953 return ret;
954}
955
956static inline int mmc_blk_part_switch(struct mmc_card *card,
957 unsigned int part_type)
958{
959 int ret = 0;
960 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
961
962 if (main_md->part_curr == part_type)
963 return 0;
964
965 if (mmc_card_mmc(card)) {
966 u8 part_config = card->ext_csd.part_config;
967
968 ret = mmc_blk_part_switch_pre(card, part_type);
969 if (ret)
970 return ret;
971
972 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
973 part_config |= part_type;
974
975 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
976 EXT_CSD_PART_CONFIG, part_config,
977 card->ext_csd.part_time);
978 if (ret) {
979 mmc_blk_part_switch_post(card, part_type);
980 return ret;
981 }
982
983 card->ext_csd.part_config = part_config;
984
985 ret = mmc_blk_part_switch_post(card, main_md->part_curr);
986 }
987
988 main_md->part_curr = part_type;
989 return ret;
990}
991
992static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
993{
994 int err;
995 u32 result;
996 __be32 *blocks;
997 u8 resp_sz = mmc_card_ult_capacity(card) ? 8 : 4;
998 unsigned int noio_flag;
999
1000 struct mmc_request mrq = {};
1001 struct mmc_command cmd = {};
1002 struct mmc_data data = {};
1003 struct scatterlist sg;
1004
1005 err = mmc_app_cmd(card->host, card);
1006 if (err)
1007 return err;
1008
1009 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
1010 cmd.arg = 0;
1011 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1012
1013 data.blksz = resp_sz;
1014 data.blocks = 1;
1015 data.flags = MMC_DATA_READ;
1016 data.sg = &sg;
1017 data.sg_len = 1;
1018 mmc_set_data_timeout(&data, card);
1019
1020 mrq.cmd = &cmd;
1021 mrq.data = &data;
1022
1023 noio_flag = memalloc_noio_save();
1024 blocks = kmalloc(resp_sz, GFP_KERNEL);
1025 memalloc_noio_restore(noio_flag);
1026 if (!blocks)
1027 return -ENOMEM;
1028
1029 sg_init_one(&sg, blocks, resp_sz);
1030
1031 mmc_wait_for_req(card->host, &mrq);
1032
1033 if (mmc_card_ult_capacity(card)) {
1034 /*
1035 * Normally, ACMD22 returns the number of written sectors as
1036 * u32. SDUC, however, returns it as u64. This is not a
1037 * superfluous requirement, because SDUC writes may exceed 2TB.
1038 * For Linux mmc however, the previously write operation could
1039 * not be more than the block layer limits, thus just make room
1040 * for a u64 and cast the response back to u32.
1041 */
1042 result = clamp_val(get_unaligned_be64(blocks), 0, UINT_MAX);
1043 } else {
1044 result = ntohl(*blocks);
1045 }
1046 kfree(blocks);
1047
1048 if (cmd.error || data.error)
1049 return -EIO;
1050
1051 *written_blocks = result;
1052
1053 return 0;
1054}
1055
1056static unsigned int mmc_blk_clock_khz(struct mmc_host *host)
1057{
1058 if (host->actual_clock)
1059 return host->actual_clock / 1000;
1060
1061 /* Clock may be subject to a divisor, fudge it by a factor of 2. */
1062 if (host->ios.clock)
1063 return host->ios.clock / 2000;
1064
1065 /* How can there be no clock */
1066 WARN_ON_ONCE(1);
1067 return 100; /* 100 kHz is minimum possible value */
1068}
1069
1070static unsigned int mmc_blk_data_timeout_ms(struct mmc_host *host,
1071 struct mmc_data *data)
1072{
1073 unsigned int ms = DIV_ROUND_UP(data->timeout_ns, 1000000);
1074 unsigned int khz;
1075
1076 if (data->timeout_clks) {
1077 khz = mmc_blk_clock_khz(host);
1078 ms += DIV_ROUND_UP(data->timeout_clks, khz);
1079 }
1080
1081 return ms;
1082}
1083
1084/*
1085 * Attempts to reset the card and get back to the requested partition.
1086 * Therefore any error here must result in cancelling the block layer
1087 * request, it must not be reattempted without going through the mmc_blk
1088 * partition sanity checks.
1089 */
1090static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1091 int type)
1092{
1093 int err;
1094 struct mmc_blk_data *main_md = dev_get_drvdata(&host->card->dev);
1095
1096 if (md->reset_done & type)
1097 return -EEXIST;
1098
1099 md->reset_done |= type;
1100 err = mmc_hw_reset(host->card);
1101 /*
1102 * A successful reset will leave the card in the main partition, but
1103 * upon failure it might not be, so set it to MMC_BLK_PART_INVALID
1104 * in that case.
1105 */
1106 main_md->part_curr = err ? MMC_BLK_PART_INVALID : main_md->part_type;
1107 if (err)
1108 return err;
1109 /* Ensure we switch back to the correct partition */
1110 if (mmc_blk_part_switch(host->card, md->part_type))
1111 /*
1112 * We have failed to get back into the correct
1113 * partition, so we need to abort the whole request.
1114 */
1115 return -ENODEV;
1116 return 0;
1117}
1118
1119static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1120{
1121 md->reset_done &= ~type;
1122}
1123
1124static void mmc_blk_check_sbc(struct mmc_queue_req *mq_rq)
1125{
1126 struct mmc_blk_ioc_data **idata = mq_rq->drv_op_data;
1127 int i;
1128
1129 for (i = 1; i < mq_rq->ioc_count; i++) {
1130 if (idata[i - 1]->ic.opcode == MMC_SET_BLOCK_COUNT &&
1131 mmc_op_multi(idata[i]->ic.opcode)) {
1132 idata[i - 1]->flags |= MMC_BLK_IOC_DROP;
1133 idata[i]->flags |= MMC_BLK_IOC_SBC;
1134 }
1135 }
1136}
1137
1138/*
1139 * The non-block commands come back from the block layer after it queued it and
1140 * processed it with all other requests and then they get issued in this
1141 * function.
1142 */
1143static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
1144{
1145 struct mmc_queue_req *mq_rq;
1146 struct mmc_card *card = mq->card;
1147 struct mmc_blk_data *md = mq->blkdata;
1148 struct mmc_blk_ioc_data **idata;
1149 bool rpmb_ioctl;
1150 u8 **ext_csd;
1151 u32 status;
1152 int ret;
1153 int i;
1154
1155 mq_rq = req_to_mmc_queue_req(req);
1156 rpmb_ioctl = (mq_rq->drv_op == MMC_DRV_OP_IOCTL_RPMB);
1157
1158 switch (mq_rq->drv_op) {
1159 case MMC_DRV_OP_IOCTL:
1160 if (card->ext_csd.cmdq_en) {
1161 ret = mmc_cmdq_disable(card);
1162 if (ret)
1163 break;
1164 }
1165
1166 mmc_blk_check_sbc(mq_rq);
1167
1168 fallthrough;
1169 case MMC_DRV_OP_IOCTL_RPMB:
1170 idata = mq_rq->drv_op_data;
1171 for (i = 0, ret = 0; i < mq_rq->ioc_count; i++) {
1172 ret = __mmc_blk_ioctl_cmd(card, md, idata, i);
1173 if (ret)
1174 break;
1175 }
1176 /* Always switch back to main area after RPMB access */
1177 if (rpmb_ioctl)
1178 mmc_blk_part_switch(card, 0);
1179 else if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
1180 mmc_cmdq_enable(card);
1181 break;
1182 case MMC_DRV_OP_BOOT_WP:
1183 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
1184 card->ext_csd.boot_ro_lock |
1185 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
1186 card->ext_csd.part_time);
1187 if (ret)
1188 pr_err("%s: Locking boot partition ro until next power on failed: %d\n",
1189 md->disk->disk_name, ret);
1190 else
1191 card->ext_csd.boot_ro_lock |=
1192 EXT_CSD_BOOT_WP_B_PWR_WP_EN;
1193 break;
1194 case MMC_DRV_OP_GET_CARD_STATUS:
1195 ret = mmc_send_status(card, &status);
1196 if (!ret)
1197 ret = status;
1198 break;
1199 case MMC_DRV_OP_GET_EXT_CSD:
1200 ext_csd = mq_rq->drv_op_data;
1201 ret = mmc_get_ext_csd(card, ext_csd);
1202 break;
1203 default:
1204 pr_err("%s: unknown driver specific operation\n",
1205 md->disk->disk_name);
1206 ret = -EINVAL;
1207 break;
1208 }
1209 mq_rq->drv_op_result = ret;
1210 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1211}
1212
1213static void mmc_blk_issue_erase_rq(struct mmc_queue *mq, struct request *req,
1214 int type, unsigned int erase_arg)
1215{
1216 struct mmc_blk_data *md = mq->blkdata;
1217 struct mmc_card *card = md->queue.card;
1218 unsigned int nr;
1219 sector_t from;
1220 int err = 0;
1221 blk_status_t status = BLK_STS_OK;
1222
1223 if (!mmc_can_erase(card)) {
1224 status = BLK_STS_NOTSUPP;
1225 goto fail;
1226 }
1227
1228 from = blk_rq_pos(req);
1229 nr = blk_rq_sectors(req);
1230
1231 do {
1232 err = 0;
1233 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1234 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1235 INAND_CMD38_ARG_EXT_CSD,
1236 erase_arg == MMC_TRIM_ARG ?
1237 INAND_CMD38_ARG_TRIM :
1238 INAND_CMD38_ARG_ERASE,
1239 card->ext_csd.generic_cmd6_time);
1240 }
1241 if (!err)
1242 err = mmc_erase(card, from, nr, erase_arg);
1243 } while (err == -EIO && !mmc_blk_reset(md, card->host, type));
1244 if (err)
1245 status = BLK_STS_IOERR;
1246 else
1247 mmc_blk_reset_success(md, type);
1248fail:
1249 blk_mq_end_request(req, status);
1250}
1251
1252static void mmc_blk_issue_trim_rq(struct mmc_queue *mq, struct request *req)
1253{
1254 mmc_blk_issue_erase_rq(mq, req, MMC_BLK_TRIM, MMC_TRIM_ARG);
1255}
1256
1257static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1258{
1259 struct mmc_blk_data *md = mq->blkdata;
1260 struct mmc_card *card = md->queue.card;
1261 unsigned int arg = card->erase_arg;
1262
1263 if (mmc_card_broken_sd_discard(card))
1264 arg = SD_ERASE_ARG;
1265
1266 mmc_blk_issue_erase_rq(mq, req, MMC_BLK_DISCARD, arg);
1267}
1268
1269static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1270 struct request *req)
1271{
1272 struct mmc_blk_data *md = mq->blkdata;
1273 struct mmc_card *card = md->queue.card;
1274 unsigned int nr, arg;
1275 sector_t from;
1276 int err = 0, type = MMC_BLK_SECDISCARD;
1277 blk_status_t status = BLK_STS_OK;
1278
1279 if (!(mmc_can_secure_erase_trim(card))) {
1280 status = BLK_STS_NOTSUPP;
1281 goto out;
1282 }
1283
1284 from = blk_rq_pos(req);
1285 nr = blk_rq_sectors(req);
1286
1287 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1288 arg = MMC_SECURE_TRIM1_ARG;
1289 else
1290 arg = MMC_SECURE_ERASE_ARG;
1291
1292retry:
1293 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1294 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1295 INAND_CMD38_ARG_EXT_CSD,
1296 arg == MMC_SECURE_TRIM1_ARG ?
1297 INAND_CMD38_ARG_SECTRIM1 :
1298 INAND_CMD38_ARG_SECERASE,
1299 card->ext_csd.generic_cmd6_time);
1300 if (err)
1301 goto out_retry;
1302 }
1303
1304 err = mmc_erase(card, from, nr, arg);
1305 if (err == -EIO)
1306 goto out_retry;
1307 if (err) {
1308 status = BLK_STS_IOERR;
1309 goto out;
1310 }
1311
1312 if (arg == MMC_SECURE_TRIM1_ARG) {
1313 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1314 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1315 INAND_CMD38_ARG_EXT_CSD,
1316 INAND_CMD38_ARG_SECTRIM2,
1317 card->ext_csd.generic_cmd6_time);
1318 if (err)
1319 goto out_retry;
1320 }
1321
1322 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1323 if (err == -EIO)
1324 goto out_retry;
1325 if (err) {
1326 status = BLK_STS_IOERR;
1327 goto out;
1328 }
1329 }
1330
1331out_retry:
1332 if (err && !mmc_blk_reset(md, card->host, type))
1333 goto retry;
1334 if (!err)
1335 mmc_blk_reset_success(md, type);
1336out:
1337 blk_mq_end_request(req, status);
1338}
1339
1340static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1341{
1342 struct mmc_blk_data *md = mq->blkdata;
1343 struct mmc_card *card = md->queue.card;
1344 int ret = 0;
1345
1346 ret = mmc_flush_cache(card->host);
1347 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1348}
1349
1350/*
1351 * Reformat current write as a reliable write, supporting
1352 * both legacy and the enhanced reliable write MMC cards.
1353 * In each transfer we'll handle only as much as a single
1354 * reliable write can handle, thus finish the request in
1355 * partial completions.
1356 */
1357static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1358 struct mmc_card *card,
1359 struct request *req)
1360{
1361 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1362 /* Legacy mode imposes restrictions on transfers. */
1363 if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors))
1364 brq->data.blocks = 1;
1365
1366 if (brq->data.blocks > card->ext_csd.rel_sectors)
1367 brq->data.blocks = card->ext_csd.rel_sectors;
1368 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1369 brq->data.blocks = 1;
1370 }
1371}
1372
1373#define CMD_ERRORS_EXCL_OOR \
1374 (R1_ADDRESS_ERROR | /* Misaligned address */ \
1375 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
1376 R1_WP_VIOLATION | /* Tried to write to protected block */ \
1377 R1_CARD_ECC_FAILED | /* Card ECC failed */ \
1378 R1_CC_ERROR | /* Card controller error */ \
1379 R1_ERROR) /* General/unknown error */
1380
1381#define CMD_ERRORS \
1382 (CMD_ERRORS_EXCL_OOR | \
1383 R1_OUT_OF_RANGE) /* Command argument out of range */ \
1384
1385static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq)
1386{
1387 u32 val;
1388
1389 /*
1390 * Per the SD specification(physical layer version 4.10)[1],
1391 * section 4.3.3, it explicitly states that "When the last
1392 * block of user area is read using CMD18, the host should
1393 * ignore OUT_OF_RANGE error that may occur even the sequence
1394 * is correct". And JESD84-B51 for eMMC also has a similar
1395 * statement on section 6.8.3.
1396 *
1397 * Multiple block read/write could be done by either predefined
1398 * method, namely CMD23, or open-ending mode. For open-ending mode,
1399 * we should ignore the OUT_OF_RANGE error as it's normal behaviour.
1400 *
1401 * However the spec[1] doesn't tell us whether we should also
1402 * ignore that for predefined method. But per the spec[1], section
1403 * 4.15 Set Block Count Command, it says"If illegal block count
1404 * is set, out of range error will be indicated during read/write
1405 * operation (For example, data transfer is stopped at user area
1406 * boundary)." In another word, we could expect a out of range error
1407 * in the response for the following CMD18/25. And if argument of
1408 * CMD23 + the argument of CMD18/25 exceed the max number of blocks,
1409 * we could also expect to get a -ETIMEDOUT or any error number from
1410 * the host drivers due to missing data response(for write)/data(for
1411 * read), as the cards will stop the data transfer by itself per the
1412 * spec. So we only need to check R1_OUT_OF_RANGE for open-ending mode.
1413 */
1414
1415 if (!brq->stop.error) {
1416 bool oor_with_open_end;
1417 /* If there is no error yet, check R1 response */
1418
1419 val = brq->stop.resp[0] & CMD_ERRORS;
1420 oor_with_open_end = val & R1_OUT_OF_RANGE && !brq->mrq.sbc;
1421
1422 if (val && !oor_with_open_end)
1423 brq->stop.error = -EIO;
1424 }
1425}
1426
1427static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
1428 int recovery_mode, bool *do_rel_wr_p,
1429 bool *do_data_tag_p)
1430{
1431 struct mmc_blk_data *md = mq->blkdata;
1432 struct mmc_card *card = md->queue.card;
1433 struct mmc_blk_request *brq = &mqrq->brq;
1434 struct request *req = mmc_queue_req_to_req(mqrq);
1435 bool do_rel_wr, do_data_tag;
1436
1437 /*
1438 * Reliable writes are used to implement Forced Unit Access and
1439 * are supported only on MMCs.
1440 */
1441 do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1442 rq_data_dir(req) == WRITE &&
1443 (md->flags & MMC_BLK_REL_WR);
1444
1445 memset(brq, 0, sizeof(struct mmc_blk_request));
1446
1447 mmc_crypto_prepare_req(mqrq);
1448
1449 brq->mrq.data = &brq->data;
1450 brq->mrq.tag = req->tag;
1451
1452 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1453 brq->stop.arg = 0;
1454
1455 if (rq_data_dir(req) == READ) {
1456 brq->data.flags = MMC_DATA_READ;
1457 brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1458 } else {
1459 brq->data.flags = MMC_DATA_WRITE;
1460 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1461 }
1462
1463 brq->data.blksz = 512;
1464 brq->data.blocks = blk_rq_sectors(req);
1465 brq->data.blk_addr = blk_rq_pos(req);
1466
1467 /*
1468 * The command queue supports 2 priorities: "high" (1) and "simple" (0).
1469 * The eMMC will give "high" priority tasks priority over "simple"
1470 * priority tasks. Here we always set "simple" priority by not setting
1471 * MMC_DATA_PRIO.
1472 */
1473
1474 /*
1475 * The block layer doesn't support all sector count
1476 * restrictions, so we need to be prepared for too big
1477 * requests.
1478 */
1479 if (brq->data.blocks > card->host->max_blk_count)
1480 brq->data.blocks = card->host->max_blk_count;
1481
1482 if (brq->data.blocks > 1) {
1483 /*
1484 * Some SD cards in SPI mode return a CRC error or even lock up
1485 * completely when trying to read the last block using a
1486 * multiblock read command.
1487 */
1488 if (mmc_host_is_spi(card->host) && (rq_data_dir(req) == READ) &&
1489 (blk_rq_pos(req) + blk_rq_sectors(req) ==
1490 get_capacity(md->disk)))
1491 brq->data.blocks--;
1492
1493 /*
1494 * After a read error, we redo the request one (native) sector
1495 * at a time in order to accurately determine which
1496 * sectors can be read successfully.
1497 */
1498 if (recovery_mode)
1499 brq->data.blocks = queue_physical_block_size(mq->queue) >> 9;
1500
1501 /*
1502 * Some controllers have HW issues while operating
1503 * in multiple I/O mode
1504 */
1505 if (card->host->ops->multi_io_quirk)
1506 brq->data.blocks = card->host->ops->multi_io_quirk(card,
1507 (rq_data_dir(req) == READ) ?
1508 MMC_DATA_READ : MMC_DATA_WRITE,
1509 brq->data.blocks);
1510 }
1511
1512 if (do_rel_wr) {
1513 mmc_apply_rel_rw(brq, card, req);
1514 brq->data.flags |= MMC_DATA_REL_WR;
1515 }
1516
1517 /*
1518 * Data tag is used only during writing meta data to speed
1519 * up write and any subsequent read of this meta data
1520 */
1521 do_data_tag = card->ext_csd.data_tag_unit_size &&
1522 (req->cmd_flags & REQ_META) &&
1523 (rq_data_dir(req) == WRITE) &&
1524 ((brq->data.blocks * brq->data.blksz) >=
1525 card->ext_csd.data_tag_unit_size);
1526
1527 if (do_data_tag)
1528 brq->data.flags |= MMC_DATA_DAT_TAG;
1529
1530 mmc_set_data_timeout(&brq->data, card);
1531
1532 brq->data.sg = mqrq->sg;
1533 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1534
1535 /*
1536 * Adjust the sg list so it is the same size as the
1537 * request.
1538 */
1539 if (brq->data.blocks != blk_rq_sectors(req)) {
1540 int i, data_size = brq->data.blocks << 9;
1541 struct scatterlist *sg;
1542
1543 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1544 data_size -= sg->length;
1545 if (data_size <= 0) {
1546 sg->length += data_size;
1547 i++;
1548 break;
1549 }
1550 }
1551 brq->data.sg_len = i;
1552 }
1553
1554 if (do_rel_wr_p)
1555 *do_rel_wr_p = do_rel_wr;
1556
1557 if (do_data_tag_p)
1558 *do_data_tag_p = do_data_tag;
1559}
1560
1561#define MMC_CQE_RETRIES 2
1562
1563static void mmc_blk_cqe_complete_rq(struct mmc_queue *mq, struct request *req)
1564{
1565 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1566 struct mmc_request *mrq = &mqrq->brq.mrq;
1567 struct request_queue *q = req->q;
1568 struct mmc_host *host = mq->card->host;
1569 enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
1570 unsigned long flags;
1571 bool put_card;
1572 int err;
1573
1574 mmc_cqe_post_req(host, mrq);
1575
1576 if (mrq->cmd && mrq->cmd->error)
1577 err = mrq->cmd->error;
1578 else if (mrq->data && mrq->data->error)
1579 err = mrq->data->error;
1580 else
1581 err = 0;
1582
1583 if (err) {
1584 if (mqrq->retries++ < MMC_CQE_RETRIES)
1585 blk_mq_requeue_request(req, true);
1586 else
1587 blk_mq_end_request(req, BLK_STS_IOERR);
1588 } else if (mrq->data) {
1589 if (blk_update_request(req, BLK_STS_OK, mrq->data->bytes_xfered))
1590 blk_mq_requeue_request(req, true);
1591 else
1592 __blk_mq_end_request(req, BLK_STS_OK);
1593 } else if (mq->in_recovery) {
1594 blk_mq_requeue_request(req, true);
1595 } else {
1596 blk_mq_end_request(req, BLK_STS_OK);
1597 }
1598
1599 spin_lock_irqsave(&mq->lock, flags);
1600
1601 mq->in_flight[issue_type] -= 1;
1602
1603 put_card = (mmc_tot_in_flight(mq) == 0);
1604
1605 mmc_cqe_check_busy(mq);
1606
1607 spin_unlock_irqrestore(&mq->lock, flags);
1608
1609 if (!mq->cqe_busy)
1610 blk_mq_run_hw_queues(q, true);
1611
1612 if (put_card)
1613 mmc_put_card(mq->card, &mq->ctx);
1614}
1615
1616void mmc_blk_cqe_recovery(struct mmc_queue *mq)
1617{
1618 struct mmc_card *card = mq->card;
1619 struct mmc_host *host = card->host;
1620 int err;
1621
1622 pr_debug("%s: CQE recovery start\n", mmc_hostname(host));
1623
1624 err = mmc_cqe_recovery(host);
1625 if (err)
1626 mmc_blk_reset(mq->blkdata, host, MMC_BLK_CQE_RECOVERY);
1627 mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
1628
1629 pr_debug("%s: CQE recovery done\n", mmc_hostname(host));
1630}
1631
1632static void mmc_blk_cqe_req_done(struct mmc_request *mrq)
1633{
1634 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
1635 brq.mrq);
1636 struct request *req = mmc_queue_req_to_req(mqrq);
1637 struct request_queue *q = req->q;
1638 struct mmc_queue *mq = q->queuedata;
1639
1640 /*
1641 * Block layer timeouts race with completions which means the normal
1642 * completion path cannot be used during recovery.
1643 */
1644 if (mq->in_recovery)
1645 mmc_blk_cqe_complete_rq(mq, req);
1646 else if (likely(!blk_should_fake_timeout(req->q)))
1647 blk_mq_complete_request(req);
1648}
1649
1650static int mmc_blk_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
1651{
1652 mrq->done = mmc_blk_cqe_req_done;
1653 mrq->recovery_notifier = mmc_cqe_recovery_notifier;
1654
1655 return mmc_cqe_start_req(host, mrq);
1656}
1657
1658static struct mmc_request *mmc_blk_cqe_prep_dcmd(struct mmc_queue_req *mqrq,
1659 struct request *req)
1660{
1661 struct mmc_blk_request *brq = &mqrq->brq;
1662
1663 memset(brq, 0, sizeof(*brq));
1664
1665 brq->mrq.cmd = &brq->cmd;
1666 brq->mrq.tag = req->tag;
1667
1668 return &brq->mrq;
1669}
1670
1671static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req)
1672{
1673 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1674 struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req);
1675
1676 mrq->cmd->opcode = MMC_SWITCH;
1677 mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1678 (EXT_CSD_FLUSH_CACHE << 16) |
1679 (1 << 8) |
1680 EXT_CSD_CMD_SET_NORMAL;
1681 mrq->cmd->flags = MMC_CMD_AC | MMC_RSP_R1B;
1682
1683 return mmc_blk_cqe_start_req(mq->card->host, mrq);
1684}
1685
1686static int mmc_blk_hsq_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1687{
1688 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1689 struct mmc_host *host = mq->card->host;
1690 int err;
1691
1692 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
1693 mqrq->brq.mrq.done = mmc_blk_hsq_req_done;
1694 mmc_pre_req(host, &mqrq->brq.mrq);
1695
1696 err = mmc_cqe_start_req(host, &mqrq->brq.mrq);
1697 if (err)
1698 mmc_post_req(host, &mqrq->brq.mrq, err);
1699
1700 return err;
1701}
1702
1703static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1704{
1705 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1706 struct mmc_host *host = mq->card->host;
1707
1708 if (host->hsq_enabled)
1709 return mmc_blk_hsq_issue_rw_rq(mq, req);
1710
1711 mmc_blk_data_prep(mq, mqrq, 0, NULL, NULL);
1712
1713 return mmc_blk_cqe_start_req(mq->card->host, &mqrq->brq.mrq);
1714}
1715
1716static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1717 struct mmc_card *card,
1718 int recovery_mode,
1719 struct mmc_queue *mq)
1720{
1721 u32 readcmd, writecmd;
1722 struct mmc_blk_request *brq = &mqrq->brq;
1723 struct request *req = mmc_queue_req_to_req(mqrq);
1724 struct mmc_blk_data *md = mq->blkdata;
1725 bool do_rel_wr, do_data_tag;
1726
1727 mmc_blk_data_prep(mq, mqrq, recovery_mode, &do_rel_wr, &do_data_tag);
1728
1729 brq->mrq.cmd = &brq->cmd;
1730
1731 brq->cmd.arg = blk_rq_pos(req);
1732 if (!mmc_card_blockaddr(card))
1733 brq->cmd.arg <<= 9;
1734 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1735
1736 if (brq->data.blocks > 1 || do_rel_wr) {
1737 /* SPI multiblock writes terminate using a special
1738 * token, not a STOP_TRANSMISSION request.
1739 */
1740 if (!mmc_host_is_spi(card->host) ||
1741 rq_data_dir(req) == READ)
1742 brq->mrq.stop = &brq->stop;
1743 readcmd = MMC_READ_MULTIPLE_BLOCK;
1744 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1745 } else {
1746 brq->mrq.stop = NULL;
1747 readcmd = MMC_READ_SINGLE_BLOCK;
1748 writecmd = MMC_WRITE_BLOCK;
1749 }
1750 brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd;
1751
1752 /*
1753 * Pre-defined multi-block transfers are preferable to
1754 * open ended-ones (and necessary for reliable writes).
1755 * However, it is not sufficient to just send CMD23,
1756 * and avoid the final CMD12, as on an error condition
1757 * CMD12 (stop) needs to be sent anyway. This, coupled
1758 * with Auto-CMD23 enhancements provided by some
1759 * hosts, means that the complexity of dealing
1760 * with this is best left to the host. If CMD23 is
1761 * supported by card and host, we'll fill sbc in and let
1762 * the host deal with handling it correctly. This means
1763 * that for hosts that don't expose MMC_CAP_CMD23, no
1764 * change of behavior will be observed.
1765 *
1766 * N.B: Some MMC cards experience perf degradation.
1767 * We'll avoid using CMD23-bounded multiblock writes for
1768 * these, while retaining features like reliable writes.
1769 */
1770 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1771 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1772 do_data_tag)) {
1773 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1774 brq->sbc.arg = brq->data.blocks |
1775 (do_rel_wr ? (1 << 31) : 0) |
1776 (do_data_tag ? (1 << 29) : 0);
1777 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1778 brq->mrq.sbc = &brq->sbc;
1779 }
1780
1781 if (mmc_card_ult_capacity(card)) {
1782 brq->cmd.ext_addr = blk_rq_pos(req) >> 32;
1783 brq->cmd.has_ext_addr = true;
1784 }
1785}
1786
1787#define MMC_MAX_RETRIES 5
1788#define MMC_DATA_RETRIES 2
1789#define MMC_NO_RETRIES (MMC_MAX_RETRIES + 1)
1790
1791static int mmc_blk_send_stop(struct mmc_card *card, unsigned int timeout)
1792{
1793 struct mmc_command cmd = {
1794 .opcode = MMC_STOP_TRANSMISSION,
1795 .flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC,
1796 /* Some hosts wait for busy anyway, so provide a busy timeout */
1797 .busy_timeout = timeout,
1798 };
1799
1800 return mmc_wait_for_cmd(card->host, &cmd, 5);
1801}
1802
1803static int mmc_blk_fix_state(struct mmc_card *card, struct request *req)
1804{
1805 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1806 struct mmc_blk_request *brq = &mqrq->brq;
1807 unsigned int timeout = mmc_blk_data_timeout_ms(card->host, &brq->data);
1808 int err;
1809
1810 mmc_retune_hold_now(card->host);
1811
1812 mmc_blk_send_stop(card, timeout);
1813
1814 err = mmc_poll_for_busy(card, timeout, false, MMC_BUSY_IO);
1815
1816 mmc_retune_release(card->host);
1817
1818 return err;
1819}
1820
1821#define MMC_READ_SINGLE_RETRIES 2
1822
1823/* Single (native) sector read during recovery */
1824static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
1825{
1826 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1827 struct mmc_request *mrq = &mqrq->brq.mrq;
1828 struct mmc_card *card = mq->card;
1829 struct mmc_host *host = card->host;
1830 blk_status_t error = BLK_STS_OK;
1831 size_t bytes_per_read = queue_physical_block_size(mq->queue);
1832
1833 do {
1834 u32 status;
1835 int err;
1836 int retries = 0;
1837
1838 while (retries++ <= MMC_READ_SINGLE_RETRIES) {
1839 mmc_blk_rw_rq_prep(mqrq, card, 1, mq);
1840
1841 mmc_wait_for_req(host, mrq);
1842
1843 err = mmc_send_status(card, &status);
1844 if (err)
1845 goto error_exit;
1846
1847 if (!mmc_host_is_spi(host) &&
1848 !mmc_ready_for_data(status)) {
1849 err = mmc_blk_fix_state(card, req);
1850 if (err)
1851 goto error_exit;
1852 }
1853
1854 if (!mrq->cmd->error)
1855 break;
1856 }
1857
1858 if (mrq->cmd->error ||
1859 mrq->data->error ||
1860 (!mmc_host_is_spi(host) &&
1861 (mrq->cmd->resp[0] & CMD_ERRORS || status & CMD_ERRORS)))
1862 error = BLK_STS_IOERR;
1863 else
1864 error = BLK_STS_OK;
1865
1866 } while (blk_update_request(req, error, bytes_per_read));
1867
1868 return;
1869
1870error_exit:
1871 mrq->data->bytes_xfered = 0;
1872 blk_update_request(req, BLK_STS_IOERR, bytes_per_read);
1873 /* Let it try the remaining request again */
1874 if (mqrq->retries > MMC_MAX_RETRIES - 1)
1875 mqrq->retries = MMC_MAX_RETRIES - 1;
1876}
1877
1878static inline bool mmc_blk_oor_valid(struct mmc_blk_request *brq)
1879{
1880 return !!brq->mrq.sbc;
1881}
1882
1883static inline u32 mmc_blk_stop_err_bits(struct mmc_blk_request *brq)
1884{
1885 return mmc_blk_oor_valid(brq) ? CMD_ERRORS : CMD_ERRORS_EXCL_OOR;
1886}
1887
1888/*
1889 * Check for errors the host controller driver might not have seen such as
1890 * response mode errors or invalid card state.
1891 */
1892static bool mmc_blk_status_error(struct request *req, u32 status)
1893{
1894 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1895 struct mmc_blk_request *brq = &mqrq->brq;
1896 struct mmc_queue *mq = req->q->queuedata;
1897 u32 stop_err_bits;
1898
1899 if (mmc_host_is_spi(mq->card->host))
1900 return false;
1901
1902 stop_err_bits = mmc_blk_stop_err_bits(brq);
1903
1904 return brq->cmd.resp[0] & CMD_ERRORS ||
1905 brq->stop.resp[0] & stop_err_bits ||
1906 status & stop_err_bits ||
1907 (rq_data_dir(req) == WRITE && !mmc_ready_for_data(status));
1908}
1909
1910static inline bool mmc_blk_cmd_started(struct mmc_blk_request *brq)
1911{
1912 return !brq->sbc.error && !brq->cmd.error &&
1913 !(brq->cmd.resp[0] & CMD_ERRORS);
1914}
1915
1916/*
1917 * Requests are completed by mmc_blk_mq_complete_rq() which sets simple
1918 * policy:
1919 * 1. A request that has transferred at least some data is considered
1920 * successful and will be requeued if there is remaining data to
1921 * transfer.
1922 * 2. Otherwise the number of retries is incremented and the request
1923 * will be requeued if there are remaining retries.
1924 * 3. Otherwise the request will be errored out.
1925 * That means mmc_blk_mq_complete_rq() is controlled by bytes_xfered and
1926 * mqrq->retries. So there are only 4 possible actions here:
1927 * 1. do not accept the bytes_xfered value i.e. set it to zero
1928 * 2. change mqrq->retries to determine the number of retries
1929 * 3. try to reset the card
1930 * 4. read one sector at a time
1931 */
1932static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req)
1933{
1934 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1935 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1936 struct mmc_blk_request *brq = &mqrq->brq;
1937 struct mmc_blk_data *md = mq->blkdata;
1938 struct mmc_card *card = mq->card;
1939 u32 status;
1940 u32 blocks;
1941 int err;
1942
1943 /*
1944 * Some errors the host driver might not have seen. Set the number of
1945 * bytes transferred to zero in that case.
1946 */
1947 err = __mmc_send_status(card, &status, 0);
1948 if (err || mmc_blk_status_error(req, status))
1949 brq->data.bytes_xfered = 0;
1950
1951 mmc_retune_release(card->host);
1952
1953 /*
1954 * Try again to get the status. This also provides an opportunity for
1955 * re-tuning.
1956 */
1957 if (err)
1958 err = __mmc_send_status(card, &status, 0);
1959
1960 /*
1961 * Nothing more to do after the number of bytes transferred has been
1962 * updated and there is no card.
1963 */
1964 if (err && mmc_detect_card_removed(card->host))
1965 return;
1966
1967 /* Try to get back to "tran" state */
1968 if (!mmc_host_is_spi(mq->card->host) &&
1969 (err || !mmc_ready_for_data(status)))
1970 err = mmc_blk_fix_state(mq->card, req);
1971
1972 /*
1973 * Special case for SD cards where the card might record the number of
1974 * blocks written.
1975 */
1976 if (!err && mmc_blk_cmd_started(brq) && mmc_card_sd(card) &&
1977 rq_data_dir(req) == WRITE) {
1978 if (mmc_sd_num_wr_blocks(card, &blocks))
1979 brq->data.bytes_xfered = 0;
1980 else
1981 brq->data.bytes_xfered = blocks << 9;
1982 }
1983
1984 /* Reset if the card is in a bad state */
1985 if (!mmc_host_is_spi(mq->card->host) &&
1986 err && mmc_blk_reset(md, card->host, type)) {
1987 pr_err("%s: recovery failed!\n", req->q->disk->disk_name);
1988 mqrq->retries = MMC_NO_RETRIES;
1989 return;
1990 }
1991
1992 /*
1993 * If anything was done, just return and if there is anything remaining
1994 * on the request it will get requeued.
1995 */
1996 if (brq->data.bytes_xfered)
1997 return;
1998
1999 /* Reset before last retry */
2000 if (mqrq->retries + 1 == MMC_MAX_RETRIES &&
2001 mmc_blk_reset(md, card->host, type))
2002 return;
2003
2004 /* Command errors fail fast, so use all MMC_MAX_RETRIES */
2005 if (brq->sbc.error || brq->cmd.error)
2006 return;
2007
2008 /* Reduce the remaining retries for data errors */
2009 if (mqrq->retries < MMC_MAX_RETRIES - MMC_DATA_RETRIES) {
2010 mqrq->retries = MMC_MAX_RETRIES - MMC_DATA_RETRIES;
2011 return;
2012 }
2013
2014 if (rq_data_dir(req) == READ && brq->data.blocks >
2015 queue_physical_block_size(mq->queue) >> 9) {
2016 /* Read one (native) sector at a time */
2017 mmc_blk_read_single(mq, req);
2018 return;
2019 }
2020}
2021
2022static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq)
2023{
2024 mmc_blk_eval_resp_error(brq);
2025
2026 return brq->sbc.error || brq->cmd.error || brq->stop.error ||
2027 brq->data.error || brq->cmd.resp[0] & CMD_ERRORS;
2028}
2029
2030static int mmc_spi_err_check(struct mmc_card *card)
2031{
2032 u32 status = 0;
2033 int err;
2034
2035 /*
2036 * SPI does not have a TRAN state we have to wait on, instead the
2037 * card is ready again when it no longer holds the line LOW.
2038 * We still have to ensure two things here before we know the write
2039 * was successful:
2040 * 1. The card has not disconnected during busy and we actually read our
2041 * own pull-up, thinking it was still connected, so ensure it
2042 * still responds.
2043 * 2. Check for any error bits, in particular R1_SPI_IDLE to catch a
2044 * just reconnected card after being disconnected during busy.
2045 */
2046 err = __mmc_send_status(card, &status, 0);
2047 if (err)
2048 return err;
2049 /* All R1 and R2 bits of SPI are errors in our case */
2050 if (status)
2051 return -EIO;
2052 return 0;
2053}
2054
2055static int mmc_blk_busy_cb(void *cb_data, bool *busy)
2056{
2057 struct mmc_blk_busy_data *data = cb_data;
2058 u32 status = 0;
2059 int err;
2060
2061 err = mmc_send_status(data->card, &status);
2062 if (err)
2063 return err;
2064
2065 /* Accumulate response error bits. */
2066 data->status |= status;
2067
2068 *busy = !mmc_ready_for_data(status);
2069 return 0;
2070}
2071
2072static int mmc_blk_card_busy(struct mmc_card *card, struct request *req)
2073{
2074 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2075 struct mmc_blk_busy_data cb_data;
2076 int err;
2077
2078 if (rq_data_dir(req) == READ)
2079 return 0;
2080
2081 if (mmc_host_is_spi(card->host)) {
2082 err = mmc_spi_err_check(card);
2083 if (err)
2084 mqrq->brq.data.bytes_xfered = 0;
2085 return err;
2086 }
2087
2088 cb_data.card = card;
2089 cb_data.status = 0;
2090 err = __mmc_poll_for_busy(card->host, 0, MMC_BLK_TIMEOUT_MS,
2091 &mmc_blk_busy_cb, &cb_data);
2092
2093 /*
2094 * Do not assume data transferred correctly if there are any error bits
2095 * set.
2096 */
2097 if (cb_data.status & mmc_blk_stop_err_bits(&mqrq->brq)) {
2098 mqrq->brq.data.bytes_xfered = 0;
2099 err = err ? err : -EIO;
2100 }
2101
2102 /* Copy the exception bit so it will be seen later on */
2103 if (mmc_card_mmc(card) && cb_data.status & R1_EXCEPTION_EVENT)
2104 mqrq->brq.cmd.resp[0] |= R1_EXCEPTION_EVENT;
2105
2106 return err;
2107}
2108
2109static inline void mmc_blk_rw_reset_success(struct mmc_queue *mq,
2110 struct request *req)
2111{
2112 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
2113
2114 mmc_blk_reset_success(mq->blkdata, type);
2115}
2116
2117static void mmc_blk_mq_complete_rq(struct mmc_queue *mq, struct request *req)
2118{
2119 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2120 unsigned int nr_bytes = mqrq->brq.data.bytes_xfered;
2121
2122 if (nr_bytes) {
2123 if (blk_update_request(req, BLK_STS_OK, nr_bytes))
2124 blk_mq_requeue_request(req, true);
2125 else
2126 __blk_mq_end_request(req, BLK_STS_OK);
2127 } else if (!blk_rq_bytes(req)) {
2128 __blk_mq_end_request(req, BLK_STS_IOERR);
2129 } else if (mqrq->retries++ < MMC_MAX_RETRIES) {
2130 blk_mq_requeue_request(req, true);
2131 } else {
2132 if (mmc_card_removed(mq->card))
2133 req->rq_flags |= RQF_QUIET;
2134 blk_mq_end_request(req, BLK_STS_IOERR);
2135 }
2136}
2137
2138static bool mmc_blk_urgent_bkops_needed(struct mmc_queue *mq,
2139 struct mmc_queue_req *mqrq)
2140{
2141 return mmc_card_mmc(mq->card) && !mmc_host_is_spi(mq->card->host) &&
2142 (mqrq->brq.cmd.resp[0] & R1_EXCEPTION_EVENT ||
2143 mqrq->brq.stop.resp[0] & R1_EXCEPTION_EVENT);
2144}
2145
2146static void mmc_blk_urgent_bkops(struct mmc_queue *mq,
2147 struct mmc_queue_req *mqrq)
2148{
2149 if (mmc_blk_urgent_bkops_needed(mq, mqrq))
2150 mmc_run_bkops(mq->card);
2151}
2152
2153static void mmc_blk_hsq_req_done(struct mmc_request *mrq)
2154{
2155 struct mmc_queue_req *mqrq =
2156 container_of(mrq, struct mmc_queue_req, brq.mrq);
2157 struct request *req = mmc_queue_req_to_req(mqrq);
2158 struct request_queue *q = req->q;
2159 struct mmc_queue *mq = q->queuedata;
2160 struct mmc_host *host = mq->card->host;
2161 unsigned long flags;
2162
2163 if (mmc_blk_rq_error(&mqrq->brq) ||
2164 mmc_blk_urgent_bkops_needed(mq, mqrq)) {
2165 spin_lock_irqsave(&mq->lock, flags);
2166 mq->recovery_needed = true;
2167 mq->recovery_req = req;
2168 spin_unlock_irqrestore(&mq->lock, flags);
2169
2170 host->cqe_ops->cqe_recovery_start(host);
2171
2172 schedule_work(&mq->recovery_work);
2173 return;
2174 }
2175
2176 mmc_blk_rw_reset_success(mq, req);
2177
2178 /*
2179 * Block layer timeouts race with completions which means the normal
2180 * completion path cannot be used during recovery.
2181 */
2182 if (mq->in_recovery)
2183 mmc_blk_cqe_complete_rq(mq, req);
2184 else if (likely(!blk_should_fake_timeout(req->q)))
2185 blk_mq_complete_request(req);
2186}
2187
2188void mmc_blk_mq_complete(struct request *req)
2189{
2190 struct mmc_queue *mq = req->q->queuedata;
2191 struct mmc_host *host = mq->card->host;
2192
2193 if (host->cqe_enabled)
2194 mmc_blk_cqe_complete_rq(mq, req);
2195 else if (likely(!blk_should_fake_timeout(req->q)))
2196 mmc_blk_mq_complete_rq(mq, req);
2197}
2198
2199static void mmc_blk_mq_poll_completion(struct mmc_queue *mq,
2200 struct request *req)
2201{
2202 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2203 struct mmc_host *host = mq->card->host;
2204
2205 if (mmc_blk_rq_error(&mqrq->brq) ||
2206 mmc_blk_card_busy(mq->card, req)) {
2207 mmc_blk_mq_rw_recovery(mq, req);
2208 } else {
2209 mmc_blk_rw_reset_success(mq, req);
2210 mmc_retune_release(host);
2211 }
2212
2213 mmc_blk_urgent_bkops(mq, mqrq);
2214}
2215
2216static void mmc_blk_mq_dec_in_flight(struct mmc_queue *mq, enum mmc_issue_type issue_type)
2217{
2218 unsigned long flags;
2219 bool put_card;
2220
2221 spin_lock_irqsave(&mq->lock, flags);
2222
2223 mq->in_flight[issue_type] -= 1;
2224
2225 put_card = (mmc_tot_in_flight(mq) == 0);
2226
2227 spin_unlock_irqrestore(&mq->lock, flags);
2228
2229 if (put_card)
2230 mmc_put_card(mq->card, &mq->ctx);
2231}
2232
2233static void mmc_blk_mq_post_req(struct mmc_queue *mq, struct request *req,
2234 bool can_sleep)
2235{
2236 enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
2237 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2238 struct mmc_request *mrq = &mqrq->brq.mrq;
2239 struct mmc_host *host = mq->card->host;
2240
2241 mmc_post_req(host, mrq, 0);
2242
2243 /*
2244 * Block layer timeouts race with completions which means the normal
2245 * completion path cannot be used during recovery.
2246 */
2247 if (mq->in_recovery) {
2248 mmc_blk_mq_complete_rq(mq, req);
2249 } else if (likely(!blk_should_fake_timeout(req->q))) {
2250 if (can_sleep)
2251 blk_mq_complete_request_direct(req, mmc_blk_mq_complete);
2252 else
2253 blk_mq_complete_request(req);
2254 }
2255
2256 mmc_blk_mq_dec_in_flight(mq, issue_type);
2257}
2258
2259void mmc_blk_mq_recovery(struct mmc_queue *mq)
2260{
2261 struct request *req = mq->recovery_req;
2262 struct mmc_host *host = mq->card->host;
2263 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2264
2265 mq->recovery_req = NULL;
2266 mq->rw_wait = false;
2267
2268 if (mmc_blk_rq_error(&mqrq->brq)) {
2269 mmc_retune_hold_now(host);
2270 mmc_blk_mq_rw_recovery(mq, req);
2271 }
2272
2273 mmc_blk_urgent_bkops(mq, mqrq);
2274
2275 mmc_blk_mq_post_req(mq, req, true);
2276}
2277
2278static void mmc_blk_mq_complete_prev_req(struct mmc_queue *mq,
2279 struct request **prev_req)
2280{
2281 if (mmc_host_done_complete(mq->card->host))
2282 return;
2283
2284 mutex_lock(&mq->complete_lock);
2285
2286 if (!mq->complete_req)
2287 goto out_unlock;
2288
2289 mmc_blk_mq_poll_completion(mq, mq->complete_req);
2290
2291 if (prev_req)
2292 *prev_req = mq->complete_req;
2293 else
2294 mmc_blk_mq_post_req(mq, mq->complete_req, true);
2295
2296 mq->complete_req = NULL;
2297
2298out_unlock:
2299 mutex_unlock(&mq->complete_lock);
2300}
2301
2302void mmc_blk_mq_complete_work(struct work_struct *work)
2303{
2304 struct mmc_queue *mq = container_of(work, struct mmc_queue,
2305 complete_work);
2306
2307 mmc_blk_mq_complete_prev_req(mq, NULL);
2308}
2309
2310static void mmc_blk_mq_req_done(struct mmc_request *mrq)
2311{
2312 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
2313 brq.mrq);
2314 struct request *req = mmc_queue_req_to_req(mqrq);
2315 struct request_queue *q = req->q;
2316 struct mmc_queue *mq = q->queuedata;
2317 struct mmc_host *host = mq->card->host;
2318 unsigned long flags;
2319
2320 if (!mmc_host_done_complete(host)) {
2321 bool waiting;
2322
2323 /*
2324 * We cannot complete the request in this context, so record
2325 * that there is a request to complete, and that a following
2326 * request does not need to wait (although it does need to
2327 * complete complete_req first).
2328 */
2329 spin_lock_irqsave(&mq->lock, flags);
2330 mq->complete_req = req;
2331 mq->rw_wait = false;
2332 waiting = mq->waiting;
2333 spin_unlock_irqrestore(&mq->lock, flags);
2334
2335 /*
2336 * If 'waiting' then the waiting task will complete this
2337 * request, otherwise queue a work to do it. Note that
2338 * complete_work may still race with the dispatch of a following
2339 * request.
2340 */
2341 if (waiting)
2342 wake_up(&mq->wait);
2343 else
2344 queue_work(mq->card->complete_wq, &mq->complete_work);
2345
2346 return;
2347 }
2348
2349 /* Take the recovery path for errors or urgent background operations */
2350 if (mmc_blk_rq_error(&mqrq->brq) ||
2351 mmc_blk_urgent_bkops_needed(mq, mqrq)) {
2352 spin_lock_irqsave(&mq->lock, flags);
2353 mq->recovery_needed = true;
2354 mq->recovery_req = req;
2355 spin_unlock_irqrestore(&mq->lock, flags);
2356 wake_up(&mq->wait);
2357 schedule_work(&mq->recovery_work);
2358 return;
2359 }
2360
2361 mmc_blk_rw_reset_success(mq, req);
2362
2363 mq->rw_wait = false;
2364 wake_up(&mq->wait);
2365
2366 /* context unknown */
2367 mmc_blk_mq_post_req(mq, req, false);
2368}
2369
2370static bool mmc_blk_rw_wait_cond(struct mmc_queue *mq, int *err)
2371{
2372 unsigned long flags;
2373 bool done;
2374
2375 /*
2376 * Wait while there is another request in progress, but not if recovery
2377 * is needed. Also indicate whether there is a request waiting to start.
2378 */
2379 spin_lock_irqsave(&mq->lock, flags);
2380 if (mq->recovery_needed) {
2381 *err = -EBUSY;
2382 done = true;
2383 } else {
2384 done = !mq->rw_wait;
2385 }
2386 mq->waiting = !done;
2387 spin_unlock_irqrestore(&mq->lock, flags);
2388
2389 return done;
2390}
2391
2392static int mmc_blk_rw_wait(struct mmc_queue *mq, struct request **prev_req)
2393{
2394 int err = 0;
2395
2396 wait_event(mq->wait, mmc_blk_rw_wait_cond(mq, &err));
2397
2398 /* Always complete the previous request if there is one */
2399 mmc_blk_mq_complete_prev_req(mq, prev_req);
2400
2401 return err;
2402}
2403
2404static int mmc_blk_mq_issue_rw_rq(struct mmc_queue *mq,
2405 struct request *req)
2406{
2407 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2408 struct mmc_host *host = mq->card->host;
2409 struct request *prev_req = NULL;
2410 int err = 0;
2411
2412 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
2413
2414 mqrq->brq.mrq.done = mmc_blk_mq_req_done;
2415
2416 mmc_pre_req(host, &mqrq->brq.mrq);
2417
2418 err = mmc_blk_rw_wait(mq, &prev_req);
2419 if (err)
2420 goto out_post_req;
2421
2422 mq->rw_wait = true;
2423
2424 err = mmc_start_request(host, &mqrq->brq.mrq);
2425
2426 if (prev_req)
2427 mmc_blk_mq_post_req(mq, prev_req, true);
2428
2429 if (err)
2430 mq->rw_wait = false;
2431
2432 /* Release re-tuning here where there is no synchronization required */
2433 if (err || mmc_host_done_complete(host))
2434 mmc_retune_release(host);
2435
2436out_post_req:
2437 if (err)
2438 mmc_post_req(host, &mqrq->brq.mrq, err);
2439
2440 return err;
2441}
2442
2443static int mmc_blk_wait_for_idle(struct mmc_queue *mq, struct mmc_host *host)
2444{
2445 if (host->cqe_enabled)
2446 return host->cqe_ops->cqe_wait_for_idle(host);
2447
2448 return mmc_blk_rw_wait(mq, NULL);
2449}
2450
2451enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req)
2452{
2453 struct mmc_blk_data *md = mq->blkdata;
2454 struct mmc_card *card = md->queue.card;
2455 struct mmc_host *host = card->host;
2456 int ret;
2457
2458 ret = mmc_blk_part_switch(card, md->part_type);
2459 if (ret)
2460 return MMC_REQ_FAILED_TO_START;
2461
2462 switch (mmc_issue_type(mq, req)) {
2463 case MMC_ISSUE_SYNC:
2464 ret = mmc_blk_wait_for_idle(mq, host);
2465 if (ret)
2466 return MMC_REQ_BUSY;
2467 switch (req_op(req)) {
2468 case REQ_OP_DRV_IN:
2469 case REQ_OP_DRV_OUT:
2470 mmc_blk_issue_drv_op(mq, req);
2471 break;
2472 case REQ_OP_DISCARD:
2473 mmc_blk_issue_discard_rq(mq, req);
2474 break;
2475 case REQ_OP_SECURE_ERASE:
2476 mmc_blk_issue_secdiscard_rq(mq, req);
2477 break;
2478 case REQ_OP_WRITE_ZEROES:
2479 mmc_blk_issue_trim_rq(mq, req);
2480 break;
2481 case REQ_OP_FLUSH:
2482 mmc_blk_issue_flush(mq, req);
2483 break;
2484 default:
2485 WARN_ON_ONCE(1);
2486 return MMC_REQ_FAILED_TO_START;
2487 }
2488 return MMC_REQ_FINISHED;
2489 case MMC_ISSUE_DCMD:
2490 case MMC_ISSUE_ASYNC:
2491 switch (req_op(req)) {
2492 case REQ_OP_FLUSH:
2493 if (!mmc_cache_enabled(host)) {
2494 blk_mq_end_request(req, BLK_STS_OK);
2495 return MMC_REQ_FINISHED;
2496 }
2497 ret = mmc_blk_cqe_issue_flush(mq, req);
2498 break;
2499 case REQ_OP_WRITE:
2500 card->written_flag = true;
2501 fallthrough;
2502 case REQ_OP_READ:
2503 if (host->cqe_enabled)
2504 ret = mmc_blk_cqe_issue_rw_rq(mq, req);
2505 else
2506 ret = mmc_blk_mq_issue_rw_rq(mq, req);
2507 break;
2508 default:
2509 WARN_ON_ONCE(1);
2510 ret = -EINVAL;
2511 }
2512 if (!ret)
2513 return MMC_REQ_STARTED;
2514 return ret == -EBUSY ? MMC_REQ_BUSY : MMC_REQ_FAILED_TO_START;
2515 default:
2516 WARN_ON_ONCE(1);
2517 return MMC_REQ_FAILED_TO_START;
2518 }
2519}
2520
2521static inline int mmc_blk_readonly(struct mmc_card *card)
2522{
2523 return mmc_card_readonly(card) ||
2524 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2525}
2526
2527/*
2528 * Search for a declared partitions node for the disk in mmc-card related node.
2529 *
2530 * This is to permit support for partition table defined in DT in special case
2531 * where a partition table is not written in the disk and is expected to be
2532 * passed from the running system.
2533 *
2534 * For the user disk, "partitions" node is searched.
2535 * For the special HW disk, "partitions-" node with the appended name is used
2536 * following this conversion table (to adhere to JEDEC naming)
2537 * - boot0 -> partitions-boot1
2538 * - boot1 -> partitions-boot2
2539 * - gp0 -> partitions-gp1
2540 * - gp1 -> partitions-gp2
2541 * - gp2 -> partitions-gp3
2542 * - gp3 -> partitions-gp4
2543 */
2544static struct fwnode_handle *mmc_blk_get_partitions_node(struct device *mmc_dev,
2545 const char *subname)
2546{
2547 const char *node_name = "partitions";
2548
2549 if (subname) {
2550 mmc_dev = mmc_dev->parent;
2551
2552 /*
2553 * Check if we are allocating a BOOT disk boot0/1 disk.
2554 * In DT we use the JEDEC naming boot1/2.
2555 */
2556 if (!strcmp(subname, "boot0"))
2557 node_name = "partitions-boot1";
2558 if (!strcmp(subname, "boot1"))
2559 node_name = "partitions-boot2";
2560 /*
2561 * Check if we are allocating a GP disk gp0/1/2/3 disk.
2562 * In DT we use the JEDEC naming gp1/2/3/4.
2563 */
2564 if (!strcmp(subname, "gp0"))
2565 node_name = "partitions-gp1";
2566 if (!strcmp(subname, "gp1"))
2567 node_name = "partitions-gp2";
2568 if (!strcmp(subname, "gp2"))
2569 node_name = "partitions-gp3";
2570 if (!strcmp(subname, "gp3"))
2571 node_name = "partitions-gp4";
2572 }
2573
2574 return device_get_named_child_node(mmc_dev, node_name);
2575}
2576
2577static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2578 struct device *parent,
2579 sector_t size,
2580 bool default_ro,
2581 const char *subname,
2582 int area_type,
2583 unsigned int part_type)
2584{
2585 struct fwnode_handle *disk_fwnode;
2586 struct mmc_blk_data *md;
2587 int devidx, ret;
2588 char cap_str[10];
2589 unsigned int features = 0;
2590
2591 devidx = ida_alloc_max(&mmc_blk_ida, max_devices - 1, GFP_KERNEL);
2592 if (devidx < 0) {
2593 /*
2594 * We get -ENOSPC because there are no more any available
2595 * devidx. The reason may be that, either userspace haven't yet
2596 * unmounted the partitions, which postpones mmc_blk_release()
2597 * from being called, or the device has more partitions than
2598 * what we support.
2599 */
2600 if (devidx == -ENOSPC)
2601 dev_err(mmc_dev(card->host),
2602 "no more device IDs available\n");
2603
2604 return ERR_PTR(devidx);
2605 }
2606
2607 md = kzalloc(sizeof(*md), GFP_KERNEL);
2608 if (!md) {
2609 ret = -ENOMEM;
2610 goto out;
2611 }
2612
2613 md->area_type = area_type;
2614
2615 /*
2616 * Set the read-only status based on the supported commands
2617 * and the write protect switch.
2618 */
2619 md->read_only = mmc_blk_readonly(card);
2620
2621 if (mmc_host_cmd23(card->host)) {
2622 if ((mmc_card_mmc(card) &&
2623 card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
2624 (mmc_card_sd(card) && !mmc_card_ult_capacity(card) &&
2625 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2626 md->flags |= MMC_BLK_CMD23;
2627 }
2628
2629 if (md->flags & MMC_BLK_CMD23 &&
2630 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2631 card->ext_csd.rel_sectors)) {
2632 md->flags |= MMC_BLK_REL_WR;
2633 features |= (BLK_FEAT_WRITE_CACHE | BLK_FEAT_FUA);
2634 } else if (mmc_cache_enabled(card->host)) {
2635 features |= BLK_FEAT_WRITE_CACHE;
2636 }
2637
2638 md->disk = mmc_init_queue(&md->queue, card, features);
2639 if (IS_ERR(md->disk)) {
2640 ret = PTR_ERR(md->disk);
2641 goto err_kfree;
2642 }
2643
2644 INIT_LIST_HEAD(&md->part);
2645 INIT_LIST_HEAD(&md->rpmbs);
2646 kref_init(&md->kref);
2647
2648 md->queue.blkdata = md;
2649 md->part_type = part_type;
2650
2651 md->disk->major = MMC_BLOCK_MAJOR;
2652 md->disk->minors = perdev_minors;
2653 md->disk->first_minor = devidx * perdev_minors;
2654 md->disk->fops = &mmc_bdops;
2655 md->disk->private_data = md;
2656 md->parent = parent;
2657 set_disk_ro(md->disk, md->read_only || default_ro);
2658 if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2659 md->disk->flags |= GENHD_FL_NO_PART;
2660
2661 /*
2662 * As discussed on lkml, GENHD_FL_REMOVABLE should:
2663 *
2664 * - be set for removable media with permanent block devices
2665 * - be unset for removable block devices with permanent media
2666 *
2667 * Since MMC block devices clearly fall under the second
2668 * case, we do not set GENHD_FL_REMOVABLE. Userspace
2669 * should use the block device creation/destruction hotplug
2670 * messages to tell when the card is present.
2671 */
2672
2673 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2674 "mmcblk%u%s", card->host->index, subname ? subname : "");
2675
2676 set_capacity(md->disk, size);
2677
2678 string_get_size((u64)size, 512, STRING_UNITS_2,
2679 cap_str, sizeof(cap_str));
2680 pr_info("%s: %s %s %s%s\n",
2681 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2682 cap_str, md->read_only ? " (ro)" : "");
2683
2684 /* used in ->open, must be set before add_disk: */
2685 if (area_type == MMC_BLK_DATA_AREA_MAIN)
2686 dev_set_drvdata(&card->dev, md);
2687 disk_fwnode = mmc_blk_get_partitions_node(parent, subname);
2688 ret = add_disk_fwnode(md->parent, md->disk, mmc_disk_attr_groups,
2689 disk_fwnode);
2690 if (ret)
2691 goto err_put_disk;
2692 return md;
2693
2694 err_put_disk:
2695 put_disk(md->disk);
2696 blk_mq_free_tag_set(&md->queue.tag_set);
2697 err_kfree:
2698 kfree(md);
2699 out:
2700 ida_free(&mmc_blk_ida, devidx);
2701 return ERR_PTR(ret);
2702}
2703
2704static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2705{
2706 sector_t size;
2707
2708 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2709 /*
2710 * The EXT_CSD sector count is in number or 512 byte
2711 * sectors.
2712 */
2713 size = card->ext_csd.sectors;
2714 } else {
2715 /*
2716 * The CSD capacity field is in units of read_blkbits.
2717 * set_capacity takes units of 512 bytes.
2718 */
2719 size = (typeof(sector_t))card->csd.capacity
2720 << (card->csd.read_blkbits - 9);
2721 }
2722
2723 return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2724 MMC_BLK_DATA_AREA_MAIN, 0);
2725}
2726
2727static int mmc_blk_alloc_part(struct mmc_card *card,
2728 struct mmc_blk_data *md,
2729 unsigned int part_type,
2730 sector_t size,
2731 bool default_ro,
2732 const char *subname,
2733 int area_type)
2734{
2735 struct mmc_blk_data *part_md;
2736
2737 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2738 subname, area_type, part_type);
2739 if (IS_ERR(part_md))
2740 return PTR_ERR(part_md);
2741 list_add(&part_md->part, &md->part);
2742
2743 return 0;
2744}
2745
2746/**
2747 * mmc_rpmb_ioctl() - ioctl handler for the RPMB chardev
2748 * @filp: the character device file
2749 * @cmd: the ioctl() command
2750 * @arg: the argument from userspace
2751 *
2752 * This will essentially just redirect the ioctl()s coming in over to
2753 * the main block device spawning the RPMB character device.
2754 */
2755static long mmc_rpmb_ioctl(struct file *filp, unsigned int cmd,
2756 unsigned long arg)
2757{
2758 struct mmc_rpmb_data *rpmb = filp->private_data;
2759 int ret;
2760
2761 switch (cmd) {
2762 case MMC_IOC_CMD:
2763 ret = mmc_blk_ioctl_cmd(rpmb->md,
2764 (struct mmc_ioc_cmd __user *)arg,
2765 rpmb);
2766 break;
2767 case MMC_IOC_MULTI_CMD:
2768 ret = mmc_blk_ioctl_multi_cmd(rpmb->md,
2769 (struct mmc_ioc_multi_cmd __user *)arg,
2770 rpmb);
2771 break;
2772 default:
2773 ret = -EINVAL;
2774 break;
2775 }
2776
2777 return ret;
2778}
2779
2780#ifdef CONFIG_COMPAT
2781static long mmc_rpmb_ioctl_compat(struct file *filp, unsigned int cmd,
2782 unsigned long arg)
2783{
2784 return mmc_rpmb_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
2785}
2786#endif
2787
2788static int mmc_rpmb_chrdev_open(struct inode *inode, struct file *filp)
2789{
2790 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2791 struct mmc_rpmb_data, chrdev);
2792
2793 get_device(&rpmb->dev);
2794 filp->private_data = rpmb;
2795
2796 return nonseekable_open(inode, filp);
2797}
2798
2799static int mmc_rpmb_chrdev_release(struct inode *inode, struct file *filp)
2800{
2801 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2802 struct mmc_rpmb_data, chrdev);
2803
2804 put_device(&rpmb->dev);
2805
2806 return 0;
2807}
2808
2809static const struct file_operations mmc_rpmb_fileops = {
2810 .release = mmc_rpmb_chrdev_release,
2811 .open = mmc_rpmb_chrdev_open,
2812 .owner = THIS_MODULE,
2813 .unlocked_ioctl = mmc_rpmb_ioctl,
2814#ifdef CONFIG_COMPAT
2815 .compat_ioctl = mmc_rpmb_ioctl_compat,
2816#endif
2817};
2818
2819static void mmc_blk_rpmb_device_release(struct device *dev)
2820{
2821 struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev);
2822
2823 rpmb_dev_unregister(rpmb->rdev);
2824 mmc_blk_put(rpmb->md);
2825 ida_free(&mmc_rpmb_ida, rpmb->id);
2826 kfree(rpmb);
2827}
2828
2829static void free_idata(struct mmc_blk_ioc_data **idata, unsigned int cmd_count)
2830{
2831 unsigned int n;
2832
2833 for (n = 0; n < cmd_count; n++)
2834 kfree(idata[n]);
2835 kfree(idata);
2836}
2837
2838static struct mmc_blk_ioc_data **alloc_idata(struct mmc_rpmb_data *rpmb,
2839 unsigned int cmd_count)
2840{
2841 struct mmc_blk_ioc_data **idata;
2842 unsigned int n;
2843
2844 idata = kcalloc(cmd_count, sizeof(*idata), GFP_KERNEL);
2845 if (!idata)
2846 return NULL;
2847
2848 for (n = 0; n < cmd_count; n++) {
2849 idata[n] = kcalloc(1, sizeof(**idata), GFP_KERNEL);
2850 if (!idata[n]) {
2851 free_idata(idata, n);
2852 return NULL;
2853 }
2854 idata[n]->rpmb = rpmb;
2855 }
2856
2857 return idata;
2858}
2859
2860static void set_idata(struct mmc_blk_ioc_data *idata, u32 opcode,
2861 int write_flag, u8 *buf, unsigned int buf_bytes)
2862{
2863 /*
2864 * The size of an RPMB frame must match what's expected by the
2865 * hardware.
2866 */
2867 BUILD_BUG_ON(sizeof(struct rpmb_frame) != 512);
2868
2869 idata->ic.opcode = opcode;
2870 idata->ic.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
2871 idata->ic.write_flag = write_flag;
2872 idata->ic.blksz = sizeof(struct rpmb_frame);
2873 idata->ic.blocks = buf_bytes / idata->ic.blksz;
2874 idata->buf = buf;
2875 idata->buf_bytes = buf_bytes;
2876}
2877
2878static int mmc_route_rpmb_frames(struct device *dev, u8 *req,
2879 unsigned int req_len, u8 *resp,
2880 unsigned int resp_len)
2881{
2882 struct rpmb_frame *frm = (struct rpmb_frame *)req;
2883 struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev);
2884 struct mmc_blk_data *md = rpmb->md;
2885 struct mmc_blk_ioc_data **idata;
2886 struct mmc_queue_req *mq_rq;
2887 unsigned int cmd_count;
2888 struct request *rq;
2889 u16 req_type;
2890 bool write;
2891 int ret;
2892
2893 if (IS_ERR(md->queue.card))
2894 return PTR_ERR(md->queue.card);
2895
2896 if (req_len < sizeof(*frm))
2897 return -EINVAL;
2898
2899 req_type = be16_to_cpu(frm->req_resp);
2900 switch (req_type) {
2901 case RPMB_PROGRAM_KEY:
2902 if (req_len != sizeof(struct rpmb_frame) ||
2903 resp_len != sizeof(struct rpmb_frame))
2904 return -EINVAL;
2905 write = true;
2906 break;
2907 case RPMB_GET_WRITE_COUNTER:
2908 if (req_len != sizeof(struct rpmb_frame) ||
2909 resp_len != sizeof(struct rpmb_frame))
2910 return -EINVAL;
2911 write = false;
2912 break;
2913 case RPMB_WRITE_DATA:
2914 if (req_len % sizeof(struct rpmb_frame) ||
2915 resp_len != sizeof(struct rpmb_frame))
2916 return -EINVAL;
2917 write = true;
2918 break;
2919 case RPMB_READ_DATA:
2920 if (req_len != sizeof(struct rpmb_frame) ||
2921 resp_len % sizeof(struct rpmb_frame))
2922 return -EINVAL;
2923 write = false;
2924 break;
2925 default:
2926 return -EINVAL;
2927 }
2928
2929 if (write)
2930 cmd_count = 3;
2931 else
2932 cmd_count = 2;
2933
2934 idata = alloc_idata(rpmb, cmd_count);
2935 if (!idata)
2936 return -ENOMEM;
2937
2938 if (write) {
2939 struct rpmb_frame *frm = (struct rpmb_frame *)resp;
2940
2941 /* Send write request frame(s) */
2942 set_idata(idata[0], MMC_WRITE_MULTIPLE_BLOCK,
2943 1 | MMC_CMD23_ARG_REL_WR, req, req_len);
2944
2945 /* Send result request frame */
2946 memset(frm, 0, sizeof(*frm));
2947 frm->req_resp = cpu_to_be16(RPMB_RESULT_READ);
2948 set_idata(idata[1], MMC_WRITE_MULTIPLE_BLOCK, 1, resp,
2949 resp_len);
2950
2951 /* Read response frame */
2952 set_idata(idata[2], MMC_READ_MULTIPLE_BLOCK, 0, resp, resp_len);
2953 } else {
2954 /* Send write request frame(s) */
2955 set_idata(idata[0], MMC_WRITE_MULTIPLE_BLOCK, 1, req, req_len);
2956
2957 /* Read response frame */
2958 set_idata(idata[1], MMC_READ_MULTIPLE_BLOCK, 0, resp, resp_len);
2959 }
2960
2961 rq = blk_mq_alloc_request(md->queue.queue, REQ_OP_DRV_OUT, 0);
2962 if (IS_ERR(rq)) {
2963 ret = PTR_ERR(rq);
2964 goto out;
2965 }
2966
2967 mq_rq = req_to_mmc_queue_req(rq);
2968 mq_rq->drv_op = MMC_DRV_OP_IOCTL_RPMB;
2969 mq_rq->drv_op_result = -EIO;
2970 mq_rq->drv_op_data = idata;
2971 mq_rq->ioc_count = cmd_count;
2972 blk_execute_rq(rq, false);
2973 ret = req_to_mmc_queue_req(rq)->drv_op_result;
2974
2975 blk_mq_free_request(rq);
2976
2977out:
2978 free_idata(idata, cmd_count);
2979 return ret;
2980}
2981
2982static int mmc_blk_alloc_rpmb_part(struct mmc_card *card,
2983 struct mmc_blk_data *md,
2984 unsigned int part_index,
2985 sector_t size,
2986 const char *subname)
2987{
2988 int devidx, ret;
2989 char rpmb_name[DISK_NAME_LEN];
2990 char cap_str[10];
2991 struct mmc_rpmb_data *rpmb;
2992
2993 /* This creates the minor number for the RPMB char device */
2994 devidx = ida_alloc_max(&mmc_rpmb_ida, max_devices - 1, GFP_KERNEL);
2995 if (devidx < 0)
2996 return devidx;
2997
2998 rpmb = kzalloc(sizeof(*rpmb), GFP_KERNEL);
2999 if (!rpmb) {
3000 ida_free(&mmc_rpmb_ida, devidx);
3001 return -ENOMEM;
3002 }
3003
3004 snprintf(rpmb_name, sizeof(rpmb_name),
3005 "mmcblk%u%s", card->host->index, subname ? subname : "");
3006
3007 rpmb->id = devidx;
3008 rpmb->part_index = part_index;
3009 rpmb->dev.init_name = rpmb_name;
3010 rpmb->dev.bus = &mmc_rpmb_bus_type;
3011 rpmb->dev.devt = MKDEV(MAJOR(mmc_rpmb_devt), rpmb->id);
3012 rpmb->dev.parent = &card->dev;
3013 rpmb->dev.release = mmc_blk_rpmb_device_release;
3014 device_initialize(&rpmb->dev);
3015 dev_set_drvdata(&rpmb->dev, rpmb);
3016 mmc_blk_get(md->disk);
3017 rpmb->md = md;
3018
3019 cdev_init(&rpmb->chrdev, &mmc_rpmb_fileops);
3020 rpmb->chrdev.owner = THIS_MODULE;
3021 ret = cdev_device_add(&rpmb->chrdev, &rpmb->dev);
3022 if (ret) {
3023 pr_err("%s: could not add character device\n", rpmb_name);
3024 goto out_put_device;
3025 }
3026
3027 list_add(&rpmb->node, &md->rpmbs);
3028
3029 string_get_size((u64)size, 512, STRING_UNITS_2,
3030 cap_str, sizeof(cap_str));
3031
3032 pr_info("%s: %s %s %s, chardev (%d:%d)\n",
3033 rpmb_name, mmc_card_id(card), mmc_card_name(card), cap_str,
3034 MAJOR(mmc_rpmb_devt), rpmb->id);
3035
3036 return 0;
3037
3038out_put_device:
3039 put_device(&rpmb->dev);
3040 return ret;
3041}
3042
3043static void mmc_blk_remove_rpmb_part(struct mmc_rpmb_data *rpmb)
3044
3045{
3046 cdev_device_del(&rpmb->chrdev, &rpmb->dev);
3047 put_device(&rpmb->dev);
3048}
3049
3050/* MMC Physical partitions consist of two boot partitions and
3051 * up to four general purpose partitions.
3052 * For each partition enabled in EXT_CSD a block device will be allocatedi
3053 * to provide access to the partition.
3054 */
3055
3056static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
3057{
3058 int idx, ret;
3059
3060 if (!mmc_card_mmc(card))
3061 return 0;
3062
3063 for (idx = 0; idx < card->nr_parts; idx++) {
3064 if (card->part[idx].area_type & MMC_BLK_DATA_AREA_RPMB) {
3065 /*
3066 * RPMB partitions does not provide block access, they
3067 * are only accessed using ioctl():s. Thus create
3068 * special RPMB block devices that do not have a
3069 * backing block queue for these.
3070 */
3071 ret = mmc_blk_alloc_rpmb_part(card, md,
3072 card->part[idx].part_cfg,
3073 card->part[idx].size >> 9,
3074 card->part[idx].name);
3075 if (ret)
3076 return ret;
3077 } else if (card->part[idx].size) {
3078 ret = mmc_blk_alloc_part(card, md,
3079 card->part[idx].part_cfg,
3080 card->part[idx].size >> 9,
3081 card->part[idx].force_ro,
3082 card->part[idx].name,
3083 card->part[idx].area_type);
3084 if (ret)
3085 return ret;
3086 }
3087 }
3088
3089 return 0;
3090}
3091
3092static void mmc_blk_remove_req(struct mmc_blk_data *md)
3093{
3094 /*
3095 * Flush remaining requests and free queues. It is freeing the queue
3096 * that stops new requests from being accepted.
3097 */
3098 del_gendisk(md->disk);
3099 mmc_cleanup_queue(&md->queue);
3100 mmc_blk_put(md);
3101}
3102
3103static void mmc_blk_remove_parts(struct mmc_card *card,
3104 struct mmc_blk_data *md)
3105{
3106 struct list_head *pos, *q;
3107 struct mmc_blk_data *part_md;
3108 struct mmc_rpmb_data *rpmb;
3109
3110 /* Remove RPMB partitions */
3111 list_for_each_safe(pos, q, &md->rpmbs) {
3112 rpmb = list_entry(pos, struct mmc_rpmb_data, node);
3113 list_del(pos);
3114 mmc_blk_remove_rpmb_part(rpmb);
3115 }
3116 /* Remove block partitions */
3117 list_for_each_safe(pos, q, &md->part) {
3118 part_md = list_entry(pos, struct mmc_blk_data, part);
3119 list_del(pos);
3120 mmc_blk_remove_req(part_md);
3121 }
3122}
3123
3124#ifdef CONFIG_DEBUG_FS
3125
3126static int mmc_dbg_card_status_get(void *data, u64 *val)
3127{
3128 struct mmc_card *card = data;
3129 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
3130 struct mmc_queue *mq = &md->queue;
3131 struct request *req;
3132 int ret;
3133
3134 /* Ask the block layer about the card status */
3135 req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_IN, 0);
3136 if (IS_ERR(req))
3137 return PTR_ERR(req);
3138 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_CARD_STATUS;
3139 req_to_mmc_queue_req(req)->drv_op_result = -EIO;
3140 blk_execute_rq(req, false);
3141 ret = req_to_mmc_queue_req(req)->drv_op_result;
3142 if (ret >= 0) {
3143 *val = ret;
3144 ret = 0;
3145 }
3146 blk_mq_free_request(req);
3147
3148 return ret;
3149}
3150DEFINE_DEBUGFS_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
3151 NULL, "%08llx\n");
3152
3153/* That is two digits * 512 + 1 for newline */
3154#define EXT_CSD_STR_LEN 1025
3155
3156static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
3157{
3158 struct mmc_card *card = inode->i_private;
3159 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
3160 struct mmc_queue *mq = &md->queue;
3161 struct request *req;
3162 char *buf;
3163 ssize_t n = 0;
3164 u8 *ext_csd;
3165 int err, i;
3166
3167 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
3168 if (!buf)
3169 return -ENOMEM;
3170
3171 /* Ask the block layer for the EXT CSD */
3172 req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_IN, 0);
3173 if (IS_ERR(req)) {
3174 err = PTR_ERR(req);
3175 goto out_free;
3176 }
3177 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_EXT_CSD;
3178 req_to_mmc_queue_req(req)->drv_op_result = -EIO;
3179 req_to_mmc_queue_req(req)->drv_op_data = &ext_csd;
3180 blk_execute_rq(req, false);
3181 err = req_to_mmc_queue_req(req)->drv_op_result;
3182 blk_mq_free_request(req);
3183 if (err) {
3184 pr_err("FAILED %d\n", err);
3185 goto out_free;
3186 }
3187
3188 for (i = 0; i < 512; i++)
3189 n += sprintf(buf + n, "%02x", ext_csd[i]);
3190 n += sprintf(buf + n, "\n");
3191
3192 if (n != EXT_CSD_STR_LEN) {
3193 err = -EINVAL;
3194 kfree(ext_csd);
3195 goto out_free;
3196 }
3197
3198 filp->private_data = buf;
3199 kfree(ext_csd);
3200 return 0;
3201
3202out_free:
3203 kfree(buf);
3204 return err;
3205}
3206
3207static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
3208 size_t cnt, loff_t *ppos)
3209{
3210 char *buf = filp->private_data;
3211
3212 return simple_read_from_buffer(ubuf, cnt, ppos,
3213 buf, EXT_CSD_STR_LEN);
3214}
3215
3216static int mmc_ext_csd_release(struct inode *inode, struct file *file)
3217{
3218 kfree(file->private_data);
3219 return 0;
3220}
3221
3222static const struct file_operations mmc_dbg_ext_csd_fops = {
3223 .open = mmc_ext_csd_open,
3224 .read = mmc_ext_csd_read,
3225 .release = mmc_ext_csd_release,
3226 .llseek = default_llseek,
3227};
3228
3229static void mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
3230{
3231 struct dentry *root;
3232
3233 if (!card->debugfs_root)
3234 return;
3235
3236 root = card->debugfs_root;
3237
3238 if (mmc_card_mmc(card) || mmc_card_sd(card)) {
3239 md->status_dentry =
3240 debugfs_create_file_unsafe("status", 0400, root,
3241 card,
3242 &mmc_dbg_card_status_fops);
3243 }
3244
3245 if (mmc_card_mmc(card)) {
3246 md->ext_csd_dentry =
3247 debugfs_create_file("ext_csd", S_IRUSR, root, card,
3248 &mmc_dbg_ext_csd_fops);
3249 }
3250}
3251
3252static void mmc_blk_remove_debugfs(struct mmc_card *card,
3253 struct mmc_blk_data *md)
3254{
3255 if (!card->debugfs_root)
3256 return;
3257
3258 debugfs_remove(md->status_dentry);
3259 md->status_dentry = NULL;
3260
3261 debugfs_remove(md->ext_csd_dentry);
3262 md->ext_csd_dentry = NULL;
3263}
3264
3265#else
3266
3267static void mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
3268{
3269}
3270
3271static void mmc_blk_remove_debugfs(struct mmc_card *card,
3272 struct mmc_blk_data *md)
3273{
3274}
3275
3276#endif /* CONFIG_DEBUG_FS */
3277
3278static void mmc_blk_rpmb_add(struct mmc_card *card)
3279{
3280 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
3281 struct mmc_rpmb_data *rpmb;
3282 struct rpmb_dev *rdev;
3283 unsigned int n;
3284 u32 cid[4];
3285 struct rpmb_descr descr = {
3286 .type = RPMB_TYPE_EMMC,
3287 .route_frames = mmc_route_rpmb_frames,
3288 .reliable_wr_count = card->ext_csd.enhanced_rpmb_supported ?
3289 2 : 32,
3290 .capacity = card->ext_csd.raw_rpmb_size_mult,
3291 .dev_id = (void *)cid,
3292 .dev_id_len = sizeof(cid),
3293 };
3294
3295 /*
3296 * Provice CID as an octet array. The CID needs to be interpreted
3297 * when used as input to derive the RPMB key since some fields
3298 * will change due to firmware updates.
3299 */
3300 for (n = 0; n < 4; n++)
3301 cid[n] = be32_to_cpu((__force __be32)card->raw_cid[n]);
3302
3303 list_for_each_entry(rpmb, &md->rpmbs, node) {
3304 rdev = rpmb_dev_register(&rpmb->dev, &descr);
3305 if (IS_ERR(rdev)) {
3306 pr_warn("%s: could not register RPMB device\n",
3307 dev_name(&rpmb->dev));
3308 continue;
3309 }
3310 rpmb->rdev = rdev;
3311 }
3312}
3313
3314static int mmc_blk_probe(struct mmc_card *card)
3315{
3316 struct mmc_blk_data *md;
3317 int ret = 0;
3318
3319 /*
3320 * Check that the card supports the command class(es) we need.
3321 */
3322 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
3323 return -ENODEV;
3324
3325 mmc_fixup_device(card, mmc_blk_fixups);
3326
3327 card->complete_wq = alloc_workqueue("mmc_complete",
3328 WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
3329 if (!card->complete_wq) {
3330 pr_err("Failed to create mmc completion workqueue");
3331 return -ENOMEM;
3332 }
3333
3334 md = mmc_blk_alloc(card);
3335 if (IS_ERR(md)) {
3336 ret = PTR_ERR(md);
3337 goto out_free;
3338 }
3339
3340 ret = mmc_blk_alloc_parts(card, md);
3341 if (ret)
3342 goto out;
3343
3344 /* Add two debugfs entries */
3345 mmc_blk_add_debugfs(card, md);
3346
3347 pm_runtime_set_autosuspend_delay(&card->dev, 3000);
3348 pm_runtime_use_autosuspend(&card->dev);
3349
3350 /*
3351 * Don't enable runtime PM for SD-combo cards here. Leave that
3352 * decision to be taken during the SDIO init sequence instead.
3353 */
3354 if (!mmc_card_sd_combo(card)) {
3355 pm_runtime_set_active(&card->dev);
3356 pm_runtime_enable(&card->dev);
3357 }
3358
3359 mmc_blk_rpmb_add(card);
3360
3361 return 0;
3362
3363out:
3364 mmc_blk_remove_parts(card, md);
3365 mmc_blk_remove_req(md);
3366out_free:
3367 destroy_workqueue(card->complete_wq);
3368 return ret;
3369}
3370
3371static void mmc_blk_remove(struct mmc_card *card)
3372{
3373 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
3374
3375 mmc_blk_remove_debugfs(card, md);
3376 mmc_blk_remove_parts(card, md);
3377 pm_runtime_get_sync(&card->dev);
3378 if (md->part_curr != md->part_type) {
3379 mmc_claim_host(card->host);
3380 mmc_blk_part_switch(card, md->part_type);
3381 mmc_release_host(card->host);
3382 }
3383 if (!mmc_card_sd_combo(card))
3384 pm_runtime_disable(&card->dev);
3385 pm_runtime_put_noidle(&card->dev);
3386 mmc_blk_remove_req(md);
3387 destroy_workqueue(card->complete_wq);
3388}
3389
3390static int _mmc_blk_suspend(struct mmc_card *card)
3391{
3392 struct mmc_blk_data *part_md;
3393 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
3394
3395 if (md) {
3396 mmc_queue_suspend(&md->queue);
3397 list_for_each_entry(part_md, &md->part, part) {
3398 mmc_queue_suspend(&part_md->queue);
3399 }
3400 }
3401 return 0;
3402}
3403
3404static void mmc_blk_shutdown(struct mmc_card *card)
3405{
3406 _mmc_blk_suspend(card);
3407}
3408
3409#ifdef CONFIG_PM_SLEEP
3410static int mmc_blk_suspend(struct device *dev)
3411{
3412 struct mmc_card *card = mmc_dev_to_card(dev);
3413
3414 return _mmc_blk_suspend(card);
3415}
3416
3417static int mmc_blk_resume(struct device *dev)
3418{
3419 struct mmc_blk_data *part_md;
3420 struct mmc_blk_data *md = dev_get_drvdata(dev);
3421
3422 if (md) {
3423 /*
3424 * Resume involves the card going into idle state,
3425 * so current partition is always the main one.
3426 */
3427 md->part_curr = md->part_type;
3428 mmc_queue_resume(&md->queue);
3429 list_for_each_entry(part_md, &md->part, part) {
3430 mmc_queue_resume(&part_md->queue);
3431 }
3432 }
3433 return 0;
3434}
3435#endif
3436
3437static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
3438
3439static struct mmc_driver mmc_driver = {
3440 .drv = {
3441 .name = "mmcblk",
3442 .pm = &mmc_blk_pm_ops,
3443 },
3444 .probe = mmc_blk_probe,
3445 .remove = mmc_blk_remove,
3446 .shutdown = mmc_blk_shutdown,
3447};
3448
3449static int __init mmc_blk_init(void)
3450{
3451 int res;
3452
3453 res = bus_register(&mmc_rpmb_bus_type);
3454 if (res < 0) {
3455 pr_err("mmcblk: could not register RPMB bus type\n");
3456 return res;
3457 }
3458 res = alloc_chrdev_region(&mmc_rpmb_devt, 0, MAX_DEVICES, "rpmb");
3459 if (res < 0) {
3460 pr_err("mmcblk: failed to allocate rpmb chrdev region\n");
3461 goto out_bus_unreg;
3462 }
3463
3464 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
3465 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
3466
3467 max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
3468
3469 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
3470 if (res)
3471 goto out_chrdev_unreg;
3472
3473 res = mmc_register_driver(&mmc_driver);
3474 if (res)
3475 goto out_blkdev_unreg;
3476
3477 return 0;
3478
3479out_blkdev_unreg:
3480 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3481out_chrdev_unreg:
3482 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3483out_bus_unreg:
3484 bus_unregister(&mmc_rpmb_bus_type);
3485 return res;
3486}
3487
3488static void __exit mmc_blk_exit(void)
3489{
3490 mmc_unregister_driver(&mmc_driver);
3491 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3492 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3493 bus_unregister(&mmc_rpmb_bus_type);
3494}
3495
3496module_init(mmc_blk_init);
3497module_exit(mmc_blk_exit);
3498
3499MODULE_LICENSE("GPL");
3500MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
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
79static DEFINE_MUTEX(block_mutex);
80
81/*
82 * The defaults come from config options but can be overriden by module
83 * or bootarg options.
84 */
85static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
86
87/*
88 * We've only got one major, so number of mmcblk devices is
89 * limited to (1 << 20) / number of minors per device. It is also
90 * limited by the MAX_DEVICES below.
91 */
92static int max_devices;
93
94#define MAX_DEVICES 256
95
96static DEFINE_IDA(mmc_blk_ida);
97static DEFINE_IDA(mmc_rpmb_ida);
98
99struct mmc_blk_busy_data {
100 struct mmc_card *card;
101 u32 status;
102};
103
104/*
105 * There is one mmc_blk_data per slot.
106 */
107struct mmc_blk_data {
108 struct device *parent;
109 struct gendisk *disk;
110 struct mmc_queue queue;
111 struct list_head part;
112 struct list_head rpmbs;
113
114 unsigned int flags;
115#define MMC_BLK_CMD23 (1 << 0) /* Can do SET_BLOCK_COUNT for multiblock */
116#define MMC_BLK_REL_WR (1 << 1) /* MMC Reliable write support */
117
118 struct kref kref;
119 unsigned int read_only;
120 unsigned int part_type;
121 unsigned int reset_done;
122#define MMC_BLK_READ BIT(0)
123#define MMC_BLK_WRITE BIT(1)
124#define MMC_BLK_DISCARD BIT(2)
125#define MMC_BLK_SECDISCARD BIT(3)
126#define MMC_BLK_CQE_RECOVERY BIT(4)
127#define MMC_BLK_TRIM BIT(5)
128
129 /*
130 * Only set in main mmc_blk_data associated
131 * with mmc_card with dev_set_drvdata, and keeps
132 * track of the current selected device partition.
133 */
134 unsigned int part_curr;
135#define MMC_BLK_PART_INVALID UINT_MAX /* Unknown partition active */
136 int area_type;
137
138 /* debugfs files (only in main mmc_blk_data) */
139 struct dentry *status_dentry;
140 struct dentry *ext_csd_dentry;
141};
142
143/* Device type for RPMB character devices */
144static dev_t mmc_rpmb_devt;
145
146/* Bus type for RPMB character devices */
147static struct bus_type mmc_rpmb_bus_type = {
148 .name = "mmc_rpmb",
149};
150
151/**
152 * struct mmc_rpmb_data - special RPMB device type for these areas
153 * @dev: the device for the RPMB area
154 * @chrdev: character device for the RPMB area
155 * @id: unique device ID number
156 * @part_index: partition index (0 on first)
157 * @md: parent MMC block device
158 * @node: list item, so we can put this device on a list
159 */
160struct mmc_rpmb_data {
161 struct device dev;
162 struct cdev chrdev;
163 int id;
164 unsigned int part_index;
165 struct mmc_blk_data *md;
166 struct list_head node;
167};
168
169static DEFINE_MUTEX(open_lock);
170
171module_param(perdev_minors, int, 0444);
172MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
173
174static inline int mmc_blk_part_switch(struct mmc_card *card,
175 unsigned int part_type);
176static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
177 struct mmc_card *card,
178 int recovery_mode,
179 struct mmc_queue *mq);
180static void mmc_blk_hsq_req_done(struct mmc_request *mrq);
181static int mmc_spi_err_check(struct mmc_card *card);
182static int mmc_blk_busy_cb(void *cb_data, bool *busy);
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 req_to_mmc_queue_req(req)->drv_op_result = -EIO;
270 blk_execute_rq(req, false);
271 ret = req_to_mmc_queue_req(req)->drv_op_result;
272 blk_mq_free_request(req);
273
274 if (!ret) {
275 pr_info("%s: Locking boot partition ro until next power on\n",
276 md->disk->disk_name);
277 set_disk_ro(md->disk, 1);
278
279 list_for_each_entry(part_md, &md->part, part)
280 if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
281 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
282 set_disk_ro(part_md->disk, 1);
283 }
284 }
285out_put:
286 mmc_blk_put(md);
287 return count;
288}
289
290static DEVICE_ATTR(ro_lock_until_next_power_on, 0,
291 power_ro_lock_show, power_ro_lock_store);
292
293static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
294 char *buf)
295{
296 int ret;
297 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
298
299 ret = snprintf(buf, PAGE_SIZE, "%d\n",
300 get_disk_ro(dev_to_disk(dev)) ^
301 md->read_only);
302 mmc_blk_put(md);
303 return ret;
304}
305
306static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
307 const char *buf, size_t count)
308{
309 int ret;
310 char *end;
311 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
312 unsigned long set = simple_strtoul(buf, &end, 0);
313 if (end == buf) {
314 ret = -EINVAL;
315 goto out;
316 }
317
318 set_disk_ro(dev_to_disk(dev), set || md->read_only);
319 ret = count;
320out:
321 mmc_blk_put(md);
322 return ret;
323}
324
325static DEVICE_ATTR(force_ro, 0644, force_ro_show, force_ro_store);
326
327static struct attribute *mmc_disk_attrs[] = {
328 &dev_attr_force_ro.attr,
329 &dev_attr_ro_lock_until_next_power_on.attr,
330 NULL,
331};
332
333static umode_t mmc_disk_attrs_is_visible(struct kobject *kobj,
334 struct attribute *a, int n)
335{
336 struct device *dev = kobj_to_dev(kobj);
337 struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
338 umode_t mode = a->mode;
339
340 if (a == &dev_attr_ro_lock_until_next_power_on.attr &&
341 (md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
342 md->queue.card->ext_csd.boot_ro_lockable) {
343 mode = S_IRUGO;
344 if (!(md->queue.card->ext_csd.boot_ro_lock &
345 EXT_CSD_BOOT_WP_B_PWR_WP_DIS))
346 mode |= S_IWUSR;
347 }
348
349 mmc_blk_put(md);
350 return mode;
351}
352
353static const struct attribute_group mmc_disk_attr_group = {
354 .is_visible = mmc_disk_attrs_is_visible,
355 .attrs = mmc_disk_attrs,
356};
357
358static const struct attribute_group *mmc_disk_attr_groups[] = {
359 &mmc_disk_attr_group,
360 NULL,
361};
362
363static int mmc_blk_open(struct gendisk *disk, blk_mode_t mode)
364{
365 struct mmc_blk_data *md = mmc_blk_get(disk);
366 int ret = -ENXIO;
367
368 mutex_lock(&block_mutex);
369 if (md) {
370 ret = 0;
371 if ((mode & BLK_OPEN_WRITE) && md->read_only) {
372 mmc_blk_put(md);
373 ret = -EROFS;
374 }
375 }
376 mutex_unlock(&block_mutex);
377
378 return ret;
379}
380
381static void mmc_blk_release(struct gendisk *disk)
382{
383 struct mmc_blk_data *md = disk->private_data;
384
385 mutex_lock(&block_mutex);
386 mmc_blk_put(md);
387 mutex_unlock(&block_mutex);
388}
389
390static int
391mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
392{
393 geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
394 geo->heads = 4;
395 geo->sectors = 16;
396 return 0;
397}
398
399struct mmc_blk_ioc_data {
400 struct mmc_ioc_cmd ic;
401 unsigned char *buf;
402 u64 buf_bytes;
403 unsigned int flags;
404#define MMC_BLK_IOC_DROP BIT(0) /* drop this mrq */
405#define MMC_BLK_IOC_SBC BIT(1) /* use mrq.sbc */
406
407 struct mmc_rpmb_data *rpmb;
408};
409
410static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
411 struct mmc_ioc_cmd __user *user)
412{
413 struct mmc_blk_ioc_data *idata;
414 int err;
415
416 idata = kmalloc(sizeof(*idata), GFP_KERNEL);
417 if (!idata) {
418 err = -ENOMEM;
419 goto out;
420 }
421
422 if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
423 err = -EFAULT;
424 goto idata_err;
425 }
426
427 idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
428 if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
429 err = -EOVERFLOW;
430 goto idata_err;
431 }
432
433 if (!idata->buf_bytes) {
434 idata->buf = NULL;
435 return idata;
436 }
437
438 idata->buf = memdup_user((void __user *)(unsigned long)
439 idata->ic.data_ptr, idata->buf_bytes);
440 if (IS_ERR(idata->buf)) {
441 err = PTR_ERR(idata->buf);
442 goto idata_err;
443 }
444
445 return idata;
446
447idata_err:
448 kfree(idata);
449out:
450 return ERR_PTR(err);
451}
452
453static int mmc_blk_ioctl_copy_to_user(struct mmc_ioc_cmd __user *ic_ptr,
454 struct mmc_blk_ioc_data *idata)
455{
456 struct mmc_ioc_cmd *ic = &idata->ic;
457
458 if (copy_to_user(&(ic_ptr->response), ic->response,
459 sizeof(ic->response)))
460 return -EFAULT;
461
462 if (!idata->ic.write_flag) {
463 if (copy_to_user((void __user *)(unsigned long)ic->data_ptr,
464 idata->buf, idata->buf_bytes))
465 return -EFAULT;
466 }
467
468 return 0;
469}
470
471static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
472 struct mmc_blk_ioc_data **idatas, int i)
473{
474 struct mmc_command cmd = {}, sbc = {};
475 struct mmc_data data = {};
476 struct mmc_request mrq = {};
477 struct scatterlist sg;
478 bool r1b_resp;
479 unsigned int busy_timeout_ms;
480 int err;
481 unsigned int target_part;
482 struct mmc_blk_ioc_data *idata = idatas[i];
483 struct mmc_blk_ioc_data *prev_idata = NULL;
484
485 if (!card || !md || !idata)
486 return -EINVAL;
487
488 if (idata->flags & MMC_BLK_IOC_DROP)
489 return 0;
490
491 if (idata->flags & MMC_BLK_IOC_SBC)
492 prev_idata = idatas[i - 1];
493
494 /*
495 * The RPMB accesses comes in from the character device, so we
496 * need to target these explicitly. Else we just target the
497 * partition type for the block device the ioctl() was issued
498 * on.
499 */
500 if (idata->rpmb) {
501 /* Support multiple RPMB partitions */
502 target_part = idata->rpmb->part_index;
503 target_part |= EXT_CSD_PART_CONFIG_ACC_RPMB;
504 } else {
505 target_part = md->part_type;
506 }
507
508 cmd.opcode = idata->ic.opcode;
509 cmd.arg = idata->ic.arg;
510 cmd.flags = idata->ic.flags;
511
512 if (idata->buf_bytes) {
513 data.sg = &sg;
514 data.sg_len = 1;
515 data.blksz = idata->ic.blksz;
516 data.blocks = idata->ic.blocks;
517
518 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
519
520 if (idata->ic.write_flag)
521 data.flags = MMC_DATA_WRITE;
522 else
523 data.flags = MMC_DATA_READ;
524
525 /* data.flags must already be set before doing this. */
526 mmc_set_data_timeout(&data, card);
527
528 /* Allow overriding the timeout_ns for empirical tuning. */
529 if (idata->ic.data_timeout_ns)
530 data.timeout_ns = idata->ic.data_timeout_ns;
531
532 mrq.data = &data;
533 }
534
535 mrq.cmd = &cmd;
536
537 err = mmc_blk_part_switch(card, target_part);
538 if (err)
539 return err;
540
541 if (idata->ic.is_acmd) {
542 err = mmc_app_cmd(card->host, card);
543 if (err)
544 return err;
545 }
546
547 if (idata->rpmb || prev_idata) {
548 sbc.opcode = MMC_SET_BLOCK_COUNT;
549 /*
550 * We don't do any blockcount validation because the max size
551 * may be increased by a future standard. We just copy the
552 * 'Reliable Write' bit here.
553 */
554 sbc.arg = data.blocks | (idata->ic.write_flag & BIT(31));
555 if (prev_idata)
556 sbc.arg = prev_idata->ic.arg;
557 sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
558 mrq.sbc = &sbc;
559 }
560
561 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_SANITIZE_START) &&
562 (cmd.opcode == MMC_SWITCH))
563 return mmc_sanitize(card, idata->ic.cmd_timeout_ms);
564
565 /* If it's an R1B response we need some more preparations. */
566 busy_timeout_ms = idata->ic.cmd_timeout_ms ? : MMC_BLK_TIMEOUT_MS;
567 r1b_resp = (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B;
568 if (r1b_resp)
569 mmc_prepare_busy_cmd(card->host, &cmd, busy_timeout_ms);
570
571 mmc_wait_for_req(card->host, &mrq);
572 memcpy(&idata->ic.response, cmd.resp, sizeof(cmd.resp));
573
574 if (prev_idata) {
575 memcpy(&prev_idata->ic.response, sbc.resp, sizeof(sbc.resp));
576 if (sbc.error) {
577 dev_err(mmc_dev(card->host), "%s: sbc error %d\n",
578 __func__, sbc.error);
579 return sbc.error;
580 }
581 }
582
583 if (cmd.error) {
584 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
585 __func__, cmd.error);
586 return cmd.error;
587 }
588 if (data.error) {
589 dev_err(mmc_dev(card->host), "%s: data error %d\n",
590 __func__, data.error);
591 return data.error;
592 }
593
594 /*
595 * Make sure the cache of the PARTITION_CONFIG register and
596 * PARTITION_ACCESS bits is updated in case the ioctl ext_csd write
597 * changed it successfully.
598 */
599 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_PART_CONFIG) &&
600 (cmd.opcode == MMC_SWITCH)) {
601 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
602 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg);
603
604 /*
605 * Update cache so the next mmc_blk_part_switch call operates
606 * on up-to-date data.
607 */
608 card->ext_csd.part_config = value;
609 main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK;
610 }
611
612 /*
613 * Make sure to update CACHE_CTRL in case it was changed. The cache
614 * will get turned back on if the card is re-initialized, e.g.
615 * suspend/resume or hw reset in recovery.
616 */
617 if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_CACHE_CTRL) &&
618 (cmd.opcode == MMC_SWITCH)) {
619 u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg) & 1;
620
621 card->ext_csd.cache_ctrl = value;
622 }
623
624 /*
625 * According to the SD specs, some commands require a delay after
626 * issuing the command.
627 */
628 if (idata->ic.postsleep_min_us)
629 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
630
631 if (mmc_host_is_spi(card->host)) {
632 if (idata->ic.write_flag || r1b_resp || cmd.flags & MMC_RSP_SPI_BUSY)
633 return mmc_spi_err_check(card);
634 return err;
635 }
636
637 /*
638 * Ensure RPMB, writes and R1B responses are completed by polling with
639 * CMD13. Note that, usually we don't need to poll when using HW busy
640 * detection, but here it's needed since some commands may indicate the
641 * error through the R1 status bits.
642 */
643 if (idata->rpmb || idata->ic.write_flag || r1b_resp) {
644 struct mmc_blk_busy_data cb_data = {
645 .card = card,
646 };
647
648 err = __mmc_poll_for_busy(card->host, 0, busy_timeout_ms,
649 &mmc_blk_busy_cb, &cb_data);
650
651 idata->ic.response[0] = cb_data.status;
652 }
653
654 return err;
655}
656
657static int mmc_blk_ioctl_cmd(struct mmc_blk_data *md,
658 struct mmc_ioc_cmd __user *ic_ptr,
659 struct mmc_rpmb_data *rpmb)
660{
661 struct mmc_blk_ioc_data *idata;
662 struct mmc_blk_ioc_data *idatas[1];
663 struct mmc_queue *mq;
664 struct mmc_card *card;
665 int err = 0, ioc_err = 0;
666 struct request *req;
667
668 idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
669 if (IS_ERR(idata))
670 return PTR_ERR(idata);
671 /* This will be NULL on non-RPMB ioctl():s */
672 idata->rpmb = rpmb;
673
674 card = md->queue.card;
675 if (IS_ERR(card)) {
676 err = PTR_ERR(card);
677 goto cmd_done;
678 }
679
680 /*
681 * Dispatch the ioctl() into the block request queue.
682 */
683 mq = &md->queue;
684 req = blk_mq_alloc_request(mq->queue,
685 idata->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
686 if (IS_ERR(req)) {
687 err = PTR_ERR(req);
688 goto cmd_done;
689 }
690 idatas[0] = idata;
691 req_to_mmc_queue_req(req)->drv_op =
692 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
693 req_to_mmc_queue_req(req)->drv_op_result = -EIO;
694 req_to_mmc_queue_req(req)->drv_op_data = idatas;
695 req_to_mmc_queue_req(req)->ioc_count = 1;
696 blk_execute_rq(req, false);
697 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
698 err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
699 blk_mq_free_request(req);
700
701cmd_done:
702 kfree(idata->buf);
703 kfree(idata);
704 return ioc_err ? ioc_err : err;
705}
706
707static int mmc_blk_ioctl_multi_cmd(struct mmc_blk_data *md,
708 struct mmc_ioc_multi_cmd __user *user,
709 struct mmc_rpmb_data *rpmb)
710{
711 struct mmc_blk_ioc_data **idata = NULL;
712 struct mmc_ioc_cmd __user *cmds = user->cmds;
713 struct mmc_card *card;
714 struct mmc_queue *mq;
715 int err = 0, ioc_err = 0;
716 __u64 num_of_cmds;
717 unsigned int i, n;
718 struct request *req;
719
720 if (copy_from_user(&num_of_cmds, &user->num_of_cmds,
721 sizeof(num_of_cmds)))
722 return -EFAULT;
723
724 if (!num_of_cmds)
725 return 0;
726
727 if (num_of_cmds > MMC_IOC_MAX_CMDS)
728 return -EINVAL;
729
730 n = num_of_cmds;
731 idata = kcalloc(n, sizeof(*idata), GFP_KERNEL);
732 if (!idata)
733 return -ENOMEM;
734
735 for (i = 0; i < n; i++) {
736 idata[i] = mmc_blk_ioctl_copy_from_user(&cmds[i]);
737 if (IS_ERR(idata[i])) {
738 err = PTR_ERR(idata[i]);
739 n = i;
740 goto cmd_err;
741 }
742 /* This will be NULL on non-RPMB ioctl():s */
743 idata[i]->rpmb = rpmb;
744 }
745
746 card = md->queue.card;
747 if (IS_ERR(card)) {
748 err = PTR_ERR(card);
749 goto cmd_err;
750 }
751
752
753 /*
754 * Dispatch the ioctl()s into the block request queue.
755 */
756 mq = &md->queue;
757 req = blk_mq_alloc_request(mq->queue,
758 idata[0]->ic.write_flag ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0);
759 if (IS_ERR(req)) {
760 err = PTR_ERR(req);
761 goto cmd_err;
762 }
763 req_to_mmc_queue_req(req)->drv_op =
764 rpmb ? MMC_DRV_OP_IOCTL_RPMB : MMC_DRV_OP_IOCTL;
765 req_to_mmc_queue_req(req)->drv_op_result = -EIO;
766 req_to_mmc_queue_req(req)->drv_op_data = idata;
767 req_to_mmc_queue_req(req)->ioc_count = n;
768 blk_execute_rq(req, false);
769 ioc_err = req_to_mmc_queue_req(req)->drv_op_result;
770
771 /* copy to user if data and response */
772 for (i = 0; i < n && !err; i++)
773 err = mmc_blk_ioctl_copy_to_user(&cmds[i], idata[i]);
774
775 blk_mq_free_request(req);
776
777cmd_err:
778 for (i = 0; i < n; i++) {
779 kfree(idata[i]->buf);
780 kfree(idata[i]);
781 }
782 kfree(idata);
783 return ioc_err ? ioc_err : err;
784}
785
786static int mmc_blk_check_blkdev(struct block_device *bdev)
787{
788 /*
789 * The caller must have CAP_SYS_RAWIO, and must be calling this on the
790 * whole block device, not on a partition. This prevents overspray
791 * between sibling partitions.
792 */
793 if (!capable(CAP_SYS_RAWIO) || bdev_is_partition(bdev))
794 return -EPERM;
795 return 0;
796}
797
798static int mmc_blk_ioctl(struct block_device *bdev, blk_mode_t mode,
799 unsigned int cmd, unsigned long arg)
800{
801 struct mmc_blk_data *md;
802 int ret;
803
804 switch (cmd) {
805 case MMC_IOC_CMD:
806 ret = mmc_blk_check_blkdev(bdev);
807 if (ret)
808 return ret;
809 md = mmc_blk_get(bdev->bd_disk);
810 if (!md)
811 return -EINVAL;
812 ret = mmc_blk_ioctl_cmd(md,
813 (struct mmc_ioc_cmd __user *)arg,
814 NULL);
815 mmc_blk_put(md);
816 return ret;
817 case MMC_IOC_MULTI_CMD:
818 ret = mmc_blk_check_blkdev(bdev);
819 if (ret)
820 return ret;
821 md = mmc_blk_get(bdev->bd_disk);
822 if (!md)
823 return -EINVAL;
824 ret = mmc_blk_ioctl_multi_cmd(md,
825 (struct mmc_ioc_multi_cmd __user *)arg,
826 NULL);
827 mmc_blk_put(md);
828 return ret;
829 default:
830 return -EINVAL;
831 }
832}
833
834#ifdef CONFIG_COMPAT
835static int mmc_blk_compat_ioctl(struct block_device *bdev, blk_mode_t mode,
836 unsigned int cmd, unsigned long arg)
837{
838 return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
839}
840#endif
841
842static int mmc_blk_alternative_gpt_sector(struct gendisk *disk,
843 sector_t *sector)
844{
845 struct mmc_blk_data *md;
846 int ret;
847
848 md = mmc_blk_get(disk);
849 if (!md)
850 return -EINVAL;
851
852 if (md->queue.card)
853 ret = mmc_card_alternative_gpt_sector(md->queue.card, sector);
854 else
855 ret = -ENODEV;
856
857 mmc_blk_put(md);
858
859 return ret;
860}
861
862static const struct block_device_operations mmc_bdops = {
863 .open = mmc_blk_open,
864 .release = mmc_blk_release,
865 .getgeo = mmc_blk_getgeo,
866 .owner = THIS_MODULE,
867 .ioctl = mmc_blk_ioctl,
868#ifdef CONFIG_COMPAT
869 .compat_ioctl = mmc_blk_compat_ioctl,
870#endif
871 .alternative_gpt_sector = mmc_blk_alternative_gpt_sector,
872};
873
874static int mmc_blk_part_switch_pre(struct mmc_card *card,
875 unsigned int part_type)
876{
877 const unsigned int mask = EXT_CSD_PART_CONFIG_ACC_RPMB;
878 int ret = 0;
879
880 if ((part_type & mask) == mask) {
881 if (card->ext_csd.cmdq_en) {
882 ret = mmc_cmdq_disable(card);
883 if (ret)
884 return ret;
885 }
886 mmc_retune_pause(card->host);
887 }
888
889 return ret;
890}
891
892static int mmc_blk_part_switch_post(struct mmc_card *card,
893 unsigned int part_type)
894{
895 const unsigned int mask = EXT_CSD_PART_CONFIG_ACC_RPMB;
896 int ret = 0;
897
898 if ((part_type & mask) == mask) {
899 mmc_retune_unpause(card->host);
900 if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
901 ret = mmc_cmdq_enable(card);
902 }
903
904 return ret;
905}
906
907static inline int mmc_blk_part_switch(struct mmc_card *card,
908 unsigned int part_type)
909{
910 int ret = 0;
911 struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
912
913 if (main_md->part_curr == part_type)
914 return 0;
915
916 if (mmc_card_mmc(card)) {
917 u8 part_config = card->ext_csd.part_config;
918
919 ret = mmc_blk_part_switch_pre(card, part_type);
920 if (ret)
921 return ret;
922
923 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
924 part_config |= part_type;
925
926 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
927 EXT_CSD_PART_CONFIG, part_config,
928 card->ext_csd.part_time);
929 if (ret) {
930 mmc_blk_part_switch_post(card, part_type);
931 return ret;
932 }
933
934 card->ext_csd.part_config = part_config;
935
936 ret = mmc_blk_part_switch_post(card, main_md->part_curr);
937 }
938
939 main_md->part_curr = part_type;
940 return ret;
941}
942
943static int mmc_sd_num_wr_blocks(struct mmc_card *card, u32 *written_blocks)
944{
945 int err;
946 u32 result;
947 __be32 *blocks;
948
949 struct mmc_request mrq = {};
950 struct mmc_command cmd = {};
951 struct mmc_data data = {};
952
953 struct scatterlist sg;
954
955 err = mmc_app_cmd(card->host, card);
956 if (err)
957 return err;
958
959 cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
960 cmd.arg = 0;
961 cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
962
963 data.blksz = 4;
964 data.blocks = 1;
965 data.flags = MMC_DATA_READ;
966 data.sg = &sg;
967 data.sg_len = 1;
968 mmc_set_data_timeout(&data, card);
969
970 mrq.cmd = &cmd;
971 mrq.data = &data;
972
973 blocks = kmalloc(4, GFP_KERNEL);
974 if (!blocks)
975 return -ENOMEM;
976
977 sg_init_one(&sg, blocks, 4);
978
979 mmc_wait_for_req(card->host, &mrq);
980
981 result = ntohl(*blocks);
982 kfree(blocks);
983
984 if (cmd.error || data.error)
985 return -EIO;
986
987 *written_blocks = result;
988
989 return 0;
990}
991
992static unsigned int mmc_blk_clock_khz(struct mmc_host *host)
993{
994 if (host->actual_clock)
995 return host->actual_clock / 1000;
996
997 /* Clock may be subject to a divisor, fudge it by a factor of 2. */
998 if (host->ios.clock)
999 return host->ios.clock / 2000;
1000
1001 /* How can there be no clock */
1002 WARN_ON_ONCE(1);
1003 return 100; /* 100 kHz is minimum possible value */
1004}
1005
1006static unsigned int mmc_blk_data_timeout_ms(struct mmc_host *host,
1007 struct mmc_data *data)
1008{
1009 unsigned int ms = DIV_ROUND_UP(data->timeout_ns, 1000000);
1010 unsigned int khz;
1011
1012 if (data->timeout_clks) {
1013 khz = mmc_blk_clock_khz(host);
1014 ms += DIV_ROUND_UP(data->timeout_clks, khz);
1015 }
1016
1017 return ms;
1018}
1019
1020/*
1021 * Attempts to reset the card and get back to the requested partition.
1022 * Therefore any error here must result in cancelling the block layer
1023 * request, it must not be reattempted without going through the mmc_blk
1024 * partition sanity checks.
1025 */
1026static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
1027 int type)
1028{
1029 int err;
1030 struct mmc_blk_data *main_md = dev_get_drvdata(&host->card->dev);
1031
1032 if (md->reset_done & type)
1033 return -EEXIST;
1034
1035 md->reset_done |= type;
1036 err = mmc_hw_reset(host->card);
1037 /*
1038 * A successful reset will leave the card in the main partition, but
1039 * upon failure it might not be, so set it to MMC_BLK_PART_INVALID
1040 * in that case.
1041 */
1042 main_md->part_curr = err ? MMC_BLK_PART_INVALID : main_md->part_type;
1043 if (err)
1044 return err;
1045 /* Ensure we switch back to the correct partition */
1046 if (mmc_blk_part_switch(host->card, md->part_type))
1047 /*
1048 * We have failed to get back into the correct
1049 * partition, so we need to abort the whole request.
1050 */
1051 return -ENODEV;
1052 return 0;
1053}
1054
1055static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
1056{
1057 md->reset_done &= ~type;
1058}
1059
1060static void mmc_blk_check_sbc(struct mmc_queue_req *mq_rq)
1061{
1062 struct mmc_blk_ioc_data **idata = mq_rq->drv_op_data;
1063 int i;
1064
1065 for (i = 1; i < mq_rq->ioc_count; i++) {
1066 if (idata[i - 1]->ic.opcode == MMC_SET_BLOCK_COUNT &&
1067 mmc_op_multi(idata[i]->ic.opcode)) {
1068 idata[i - 1]->flags |= MMC_BLK_IOC_DROP;
1069 idata[i]->flags |= MMC_BLK_IOC_SBC;
1070 }
1071 }
1072}
1073
1074/*
1075 * The non-block commands come back from the block layer after it queued it and
1076 * processed it with all other requests and then they get issued in this
1077 * function.
1078 */
1079static void mmc_blk_issue_drv_op(struct mmc_queue *mq, struct request *req)
1080{
1081 struct mmc_queue_req *mq_rq;
1082 struct mmc_card *card = mq->card;
1083 struct mmc_blk_data *md = mq->blkdata;
1084 struct mmc_blk_ioc_data **idata;
1085 bool rpmb_ioctl;
1086 u8 **ext_csd;
1087 u32 status;
1088 int ret;
1089 int i;
1090
1091 mq_rq = req_to_mmc_queue_req(req);
1092 rpmb_ioctl = (mq_rq->drv_op == MMC_DRV_OP_IOCTL_RPMB);
1093
1094 switch (mq_rq->drv_op) {
1095 case MMC_DRV_OP_IOCTL:
1096 if (card->ext_csd.cmdq_en) {
1097 ret = mmc_cmdq_disable(card);
1098 if (ret)
1099 break;
1100 }
1101
1102 mmc_blk_check_sbc(mq_rq);
1103
1104 fallthrough;
1105 case MMC_DRV_OP_IOCTL_RPMB:
1106 idata = mq_rq->drv_op_data;
1107 for (i = 0, ret = 0; i < mq_rq->ioc_count; i++) {
1108 ret = __mmc_blk_ioctl_cmd(card, md, idata, i);
1109 if (ret)
1110 break;
1111 }
1112 /* Always switch back to main area after RPMB access */
1113 if (rpmb_ioctl)
1114 mmc_blk_part_switch(card, 0);
1115 else if (card->reenable_cmdq && !card->ext_csd.cmdq_en)
1116 mmc_cmdq_enable(card);
1117 break;
1118 case MMC_DRV_OP_BOOT_WP:
1119 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
1120 card->ext_csd.boot_ro_lock |
1121 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
1122 card->ext_csd.part_time);
1123 if (ret)
1124 pr_err("%s: Locking boot partition ro until next power on failed: %d\n",
1125 md->disk->disk_name, ret);
1126 else
1127 card->ext_csd.boot_ro_lock |=
1128 EXT_CSD_BOOT_WP_B_PWR_WP_EN;
1129 break;
1130 case MMC_DRV_OP_GET_CARD_STATUS:
1131 ret = mmc_send_status(card, &status);
1132 if (!ret)
1133 ret = status;
1134 break;
1135 case MMC_DRV_OP_GET_EXT_CSD:
1136 ext_csd = mq_rq->drv_op_data;
1137 ret = mmc_get_ext_csd(card, ext_csd);
1138 break;
1139 default:
1140 pr_err("%s: unknown driver specific operation\n",
1141 md->disk->disk_name);
1142 ret = -EINVAL;
1143 break;
1144 }
1145 mq_rq->drv_op_result = ret;
1146 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1147}
1148
1149static void mmc_blk_issue_erase_rq(struct mmc_queue *mq, struct request *req,
1150 int type, unsigned int erase_arg)
1151{
1152 struct mmc_blk_data *md = mq->blkdata;
1153 struct mmc_card *card = md->queue.card;
1154 unsigned int from, nr;
1155 int err = 0;
1156 blk_status_t status = BLK_STS_OK;
1157
1158 if (!mmc_can_erase(card)) {
1159 status = BLK_STS_NOTSUPP;
1160 goto fail;
1161 }
1162
1163 from = blk_rq_pos(req);
1164 nr = blk_rq_sectors(req);
1165
1166 do {
1167 err = 0;
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 erase_arg == MMC_TRIM_ARG ?
1172 INAND_CMD38_ARG_TRIM :
1173 INAND_CMD38_ARG_ERASE,
1174 card->ext_csd.generic_cmd6_time);
1175 }
1176 if (!err)
1177 err = mmc_erase(card, from, nr, erase_arg);
1178 } while (err == -EIO && !mmc_blk_reset(md, card->host, type));
1179 if (err)
1180 status = BLK_STS_IOERR;
1181 else
1182 mmc_blk_reset_success(md, type);
1183fail:
1184 blk_mq_end_request(req, status);
1185}
1186
1187static void mmc_blk_issue_trim_rq(struct mmc_queue *mq, struct request *req)
1188{
1189 mmc_blk_issue_erase_rq(mq, req, MMC_BLK_TRIM, MMC_TRIM_ARG);
1190}
1191
1192static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
1193{
1194 struct mmc_blk_data *md = mq->blkdata;
1195 struct mmc_card *card = md->queue.card;
1196 unsigned int arg = card->erase_arg;
1197
1198 if (mmc_card_broken_sd_discard(card))
1199 arg = SD_ERASE_ARG;
1200
1201 mmc_blk_issue_erase_rq(mq, req, MMC_BLK_DISCARD, arg);
1202}
1203
1204static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
1205 struct request *req)
1206{
1207 struct mmc_blk_data *md = mq->blkdata;
1208 struct mmc_card *card = md->queue.card;
1209 unsigned int from, nr, arg;
1210 int err = 0, type = MMC_BLK_SECDISCARD;
1211 blk_status_t status = BLK_STS_OK;
1212
1213 if (!(mmc_can_secure_erase_trim(card))) {
1214 status = BLK_STS_NOTSUPP;
1215 goto out;
1216 }
1217
1218 from = blk_rq_pos(req);
1219 nr = blk_rq_sectors(req);
1220
1221 if (mmc_can_trim(card) && !mmc_erase_group_aligned(card, from, nr))
1222 arg = MMC_SECURE_TRIM1_ARG;
1223 else
1224 arg = MMC_SECURE_ERASE_ARG;
1225
1226retry:
1227 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1228 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1229 INAND_CMD38_ARG_EXT_CSD,
1230 arg == MMC_SECURE_TRIM1_ARG ?
1231 INAND_CMD38_ARG_SECTRIM1 :
1232 INAND_CMD38_ARG_SECERASE,
1233 card->ext_csd.generic_cmd6_time);
1234 if (err)
1235 goto out_retry;
1236 }
1237
1238 err = mmc_erase(card, from, nr, arg);
1239 if (err == -EIO)
1240 goto out_retry;
1241 if (err) {
1242 status = BLK_STS_IOERR;
1243 goto out;
1244 }
1245
1246 if (arg == MMC_SECURE_TRIM1_ARG) {
1247 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
1248 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1249 INAND_CMD38_ARG_EXT_CSD,
1250 INAND_CMD38_ARG_SECTRIM2,
1251 card->ext_csd.generic_cmd6_time);
1252 if (err)
1253 goto out_retry;
1254 }
1255
1256 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1257 if (err == -EIO)
1258 goto out_retry;
1259 if (err) {
1260 status = BLK_STS_IOERR;
1261 goto out;
1262 }
1263 }
1264
1265out_retry:
1266 if (err && !mmc_blk_reset(md, card->host, type))
1267 goto retry;
1268 if (!err)
1269 mmc_blk_reset_success(md, type);
1270out:
1271 blk_mq_end_request(req, status);
1272}
1273
1274static void mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1275{
1276 struct mmc_blk_data *md = mq->blkdata;
1277 struct mmc_card *card = md->queue.card;
1278 int ret = 0;
1279
1280 ret = mmc_flush_cache(card->host);
1281 blk_mq_end_request(req, ret ? BLK_STS_IOERR : BLK_STS_OK);
1282}
1283
1284/*
1285 * Reformat current write as a reliable write, supporting
1286 * both legacy and the enhanced reliable write MMC cards.
1287 * In each transfer we'll handle only as much as a single
1288 * reliable write can handle, thus finish the request in
1289 * partial completions.
1290 */
1291static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1292 struct mmc_card *card,
1293 struct request *req)
1294{
1295 if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1296 /* Legacy mode imposes restrictions on transfers. */
1297 if (!IS_ALIGNED(blk_rq_pos(req), card->ext_csd.rel_sectors))
1298 brq->data.blocks = 1;
1299
1300 if (brq->data.blocks > card->ext_csd.rel_sectors)
1301 brq->data.blocks = card->ext_csd.rel_sectors;
1302 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1303 brq->data.blocks = 1;
1304 }
1305}
1306
1307#define CMD_ERRORS_EXCL_OOR \
1308 (R1_ADDRESS_ERROR | /* Misaligned address */ \
1309 R1_BLOCK_LEN_ERROR | /* Transferred block length incorrect */\
1310 R1_WP_VIOLATION | /* Tried to write to protected block */ \
1311 R1_CARD_ECC_FAILED | /* Card ECC failed */ \
1312 R1_CC_ERROR | /* Card controller error */ \
1313 R1_ERROR) /* General/unknown error */
1314
1315#define CMD_ERRORS \
1316 (CMD_ERRORS_EXCL_OOR | \
1317 R1_OUT_OF_RANGE) /* Command argument out of range */ \
1318
1319static void mmc_blk_eval_resp_error(struct mmc_blk_request *brq)
1320{
1321 u32 val;
1322
1323 /*
1324 * Per the SD specification(physical layer version 4.10)[1],
1325 * section 4.3.3, it explicitly states that "When the last
1326 * block of user area is read using CMD18, the host should
1327 * ignore OUT_OF_RANGE error that may occur even the sequence
1328 * is correct". And JESD84-B51 for eMMC also has a similar
1329 * statement on section 6.8.3.
1330 *
1331 * Multiple block read/write could be done by either predefined
1332 * method, namely CMD23, or open-ending mode. For open-ending mode,
1333 * we should ignore the OUT_OF_RANGE error as it's normal behaviour.
1334 *
1335 * However the spec[1] doesn't tell us whether we should also
1336 * ignore that for predefined method. But per the spec[1], section
1337 * 4.15 Set Block Count Command, it says"If illegal block count
1338 * is set, out of range error will be indicated during read/write
1339 * operation (For example, data transfer is stopped at user area
1340 * boundary)." In another word, we could expect a out of range error
1341 * in the response for the following CMD18/25. And if argument of
1342 * CMD23 + the argument of CMD18/25 exceed the max number of blocks,
1343 * we could also expect to get a -ETIMEDOUT or any error number from
1344 * the host drivers due to missing data response(for write)/data(for
1345 * read), as the cards will stop the data transfer by itself per the
1346 * spec. So we only need to check R1_OUT_OF_RANGE for open-ending mode.
1347 */
1348
1349 if (!brq->stop.error) {
1350 bool oor_with_open_end;
1351 /* If there is no error yet, check R1 response */
1352
1353 val = brq->stop.resp[0] & CMD_ERRORS;
1354 oor_with_open_end = val & R1_OUT_OF_RANGE && !brq->mrq.sbc;
1355
1356 if (val && !oor_with_open_end)
1357 brq->stop.error = -EIO;
1358 }
1359}
1360
1361static void mmc_blk_data_prep(struct mmc_queue *mq, struct mmc_queue_req *mqrq,
1362 int recovery_mode, bool *do_rel_wr_p,
1363 bool *do_data_tag_p)
1364{
1365 struct mmc_blk_data *md = mq->blkdata;
1366 struct mmc_card *card = md->queue.card;
1367 struct mmc_blk_request *brq = &mqrq->brq;
1368 struct request *req = mmc_queue_req_to_req(mqrq);
1369 bool do_rel_wr, do_data_tag;
1370
1371 /*
1372 * Reliable writes are used to implement Forced Unit Access and
1373 * are supported only on MMCs.
1374 */
1375 do_rel_wr = (req->cmd_flags & REQ_FUA) &&
1376 rq_data_dir(req) == WRITE &&
1377 (md->flags & MMC_BLK_REL_WR);
1378
1379 memset(brq, 0, sizeof(struct mmc_blk_request));
1380
1381 mmc_crypto_prepare_req(mqrq);
1382
1383 brq->mrq.data = &brq->data;
1384 brq->mrq.tag = req->tag;
1385
1386 brq->stop.opcode = MMC_STOP_TRANSMISSION;
1387 brq->stop.arg = 0;
1388
1389 if (rq_data_dir(req) == READ) {
1390 brq->data.flags = MMC_DATA_READ;
1391 brq->stop.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
1392 } else {
1393 brq->data.flags = MMC_DATA_WRITE;
1394 brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1395 }
1396
1397 brq->data.blksz = 512;
1398 brq->data.blocks = blk_rq_sectors(req);
1399 brq->data.blk_addr = blk_rq_pos(req);
1400
1401 /*
1402 * The command queue supports 2 priorities: "high" (1) and "simple" (0).
1403 * The eMMC will give "high" priority tasks priority over "simple"
1404 * priority tasks. Here we always set "simple" priority by not setting
1405 * MMC_DATA_PRIO.
1406 */
1407
1408 /*
1409 * The block layer doesn't support all sector count
1410 * restrictions, so we need to be prepared for too big
1411 * requests.
1412 */
1413 if (brq->data.blocks > card->host->max_blk_count)
1414 brq->data.blocks = card->host->max_blk_count;
1415
1416 if (brq->data.blocks > 1) {
1417 /*
1418 * Some SD cards in SPI mode return a CRC error or even lock up
1419 * completely when trying to read the last block using a
1420 * multiblock read command.
1421 */
1422 if (mmc_host_is_spi(card->host) && (rq_data_dir(req) == READ) &&
1423 (blk_rq_pos(req) + blk_rq_sectors(req) ==
1424 get_capacity(md->disk)))
1425 brq->data.blocks--;
1426
1427 /*
1428 * After a read error, we redo the request one (native) sector
1429 * at a time in order to accurately determine which
1430 * sectors can be read successfully.
1431 */
1432 if (recovery_mode)
1433 brq->data.blocks = queue_physical_block_size(mq->queue) >> 9;
1434
1435 /*
1436 * Some controllers have HW issues while operating
1437 * in multiple I/O mode
1438 */
1439 if (card->host->ops->multi_io_quirk)
1440 brq->data.blocks = card->host->ops->multi_io_quirk(card,
1441 (rq_data_dir(req) == READ) ?
1442 MMC_DATA_READ : MMC_DATA_WRITE,
1443 brq->data.blocks);
1444 }
1445
1446 if (do_rel_wr) {
1447 mmc_apply_rel_rw(brq, card, req);
1448 brq->data.flags |= MMC_DATA_REL_WR;
1449 }
1450
1451 /*
1452 * Data tag is used only during writing meta data to speed
1453 * up write and any subsequent read of this meta data
1454 */
1455 do_data_tag = card->ext_csd.data_tag_unit_size &&
1456 (req->cmd_flags & REQ_META) &&
1457 (rq_data_dir(req) == WRITE) &&
1458 ((brq->data.blocks * brq->data.blksz) >=
1459 card->ext_csd.data_tag_unit_size);
1460
1461 if (do_data_tag)
1462 brq->data.flags |= MMC_DATA_DAT_TAG;
1463
1464 mmc_set_data_timeout(&brq->data, card);
1465
1466 brq->data.sg = mqrq->sg;
1467 brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1468
1469 /*
1470 * Adjust the sg list so it is the same size as the
1471 * request.
1472 */
1473 if (brq->data.blocks != blk_rq_sectors(req)) {
1474 int i, data_size = brq->data.blocks << 9;
1475 struct scatterlist *sg;
1476
1477 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1478 data_size -= sg->length;
1479 if (data_size <= 0) {
1480 sg->length += data_size;
1481 i++;
1482 break;
1483 }
1484 }
1485 brq->data.sg_len = i;
1486 }
1487
1488 if (do_rel_wr_p)
1489 *do_rel_wr_p = do_rel_wr;
1490
1491 if (do_data_tag_p)
1492 *do_data_tag_p = do_data_tag;
1493}
1494
1495#define MMC_CQE_RETRIES 2
1496
1497static void mmc_blk_cqe_complete_rq(struct mmc_queue *mq, struct request *req)
1498{
1499 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1500 struct mmc_request *mrq = &mqrq->brq.mrq;
1501 struct request_queue *q = req->q;
1502 struct mmc_host *host = mq->card->host;
1503 enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
1504 unsigned long flags;
1505 bool put_card;
1506 int err;
1507
1508 mmc_cqe_post_req(host, mrq);
1509
1510 if (mrq->cmd && mrq->cmd->error)
1511 err = mrq->cmd->error;
1512 else if (mrq->data && mrq->data->error)
1513 err = mrq->data->error;
1514 else
1515 err = 0;
1516
1517 if (err) {
1518 if (mqrq->retries++ < MMC_CQE_RETRIES)
1519 blk_mq_requeue_request(req, true);
1520 else
1521 blk_mq_end_request(req, BLK_STS_IOERR);
1522 } else if (mrq->data) {
1523 if (blk_update_request(req, BLK_STS_OK, mrq->data->bytes_xfered))
1524 blk_mq_requeue_request(req, true);
1525 else
1526 __blk_mq_end_request(req, BLK_STS_OK);
1527 } else if (mq->in_recovery) {
1528 blk_mq_requeue_request(req, true);
1529 } else {
1530 blk_mq_end_request(req, BLK_STS_OK);
1531 }
1532
1533 spin_lock_irqsave(&mq->lock, flags);
1534
1535 mq->in_flight[issue_type] -= 1;
1536
1537 put_card = (mmc_tot_in_flight(mq) == 0);
1538
1539 mmc_cqe_check_busy(mq);
1540
1541 spin_unlock_irqrestore(&mq->lock, flags);
1542
1543 if (!mq->cqe_busy)
1544 blk_mq_run_hw_queues(q, true);
1545
1546 if (put_card)
1547 mmc_put_card(mq->card, &mq->ctx);
1548}
1549
1550void mmc_blk_cqe_recovery(struct mmc_queue *mq)
1551{
1552 struct mmc_card *card = mq->card;
1553 struct mmc_host *host = card->host;
1554 int err;
1555
1556 pr_debug("%s: CQE recovery start\n", mmc_hostname(host));
1557
1558 err = mmc_cqe_recovery(host);
1559 if (err)
1560 mmc_blk_reset(mq->blkdata, host, MMC_BLK_CQE_RECOVERY);
1561 mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
1562
1563 pr_debug("%s: CQE recovery done\n", mmc_hostname(host));
1564}
1565
1566static void mmc_blk_cqe_req_done(struct mmc_request *mrq)
1567{
1568 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
1569 brq.mrq);
1570 struct request *req = mmc_queue_req_to_req(mqrq);
1571 struct request_queue *q = req->q;
1572 struct mmc_queue *mq = q->queuedata;
1573
1574 /*
1575 * Block layer timeouts race with completions which means the normal
1576 * completion path cannot be used during recovery.
1577 */
1578 if (mq->in_recovery)
1579 mmc_blk_cqe_complete_rq(mq, req);
1580 else if (likely(!blk_should_fake_timeout(req->q)))
1581 blk_mq_complete_request(req);
1582}
1583
1584static int mmc_blk_cqe_start_req(struct mmc_host *host, struct mmc_request *mrq)
1585{
1586 mrq->done = mmc_blk_cqe_req_done;
1587 mrq->recovery_notifier = mmc_cqe_recovery_notifier;
1588
1589 return mmc_cqe_start_req(host, mrq);
1590}
1591
1592static struct mmc_request *mmc_blk_cqe_prep_dcmd(struct mmc_queue_req *mqrq,
1593 struct request *req)
1594{
1595 struct mmc_blk_request *brq = &mqrq->brq;
1596
1597 memset(brq, 0, sizeof(*brq));
1598
1599 brq->mrq.cmd = &brq->cmd;
1600 brq->mrq.tag = req->tag;
1601
1602 return &brq->mrq;
1603}
1604
1605static int mmc_blk_cqe_issue_flush(struct mmc_queue *mq, struct request *req)
1606{
1607 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1608 struct mmc_request *mrq = mmc_blk_cqe_prep_dcmd(mqrq, req);
1609
1610 mrq->cmd->opcode = MMC_SWITCH;
1611 mrq->cmd->arg = (MMC_SWITCH_MODE_WRITE_BYTE << 24) |
1612 (EXT_CSD_FLUSH_CACHE << 16) |
1613 (1 << 8) |
1614 EXT_CSD_CMD_SET_NORMAL;
1615 mrq->cmd->flags = MMC_CMD_AC | MMC_RSP_R1B;
1616
1617 return mmc_blk_cqe_start_req(mq->card->host, mrq);
1618}
1619
1620static int mmc_blk_hsq_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1621{
1622 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1623 struct mmc_host *host = mq->card->host;
1624 int err;
1625
1626 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
1627 mqrq->brq.mrq.done = mmc_blk_hsq_req_done;
1628 mmc_pre_req(host, &mqrq->brq.mrq);
1629
1630 err = mmc_cqe_start_req(host, &mqrq->brq.mrq);
1631 if (err)
1632 mmc_post_req(host, &mqrq->brq.mrq, err);
1633
1634 return err;
1635}
1636
1637static int mmc_blk_cqe_issue_rw_rq(struct mmc_queue *mq, struct request *req)
1638{
1639 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1640 struct mmc_host *host = mq->card->host;
1641
1642 if (host->hsq_enabled)
1643 return mmc_blk_hsq_issue_rw_rq(mq, req);
1644
1645 mmc_blk_data_prep(mq, mqrq, 0, NULL, NULL);
1646
1647 return mmc_blk_cqe_start_req(mq->card->host, &mqrq->brq.mrq);
1648}
1649
1650static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1651 struct mmc_card *card,
1652 int recovery_mode,
1653 struct mmc_queue *mq)
1654{
1655 u32 readcmd, writecmd;
1656 struct mmc_blk_request *brq = &mqrq->brq;
1657 struct request *req = mmc_queue_req_to_req(mqrq);
1658 struct mmc_blk_data *md = mq->blkdata;
1659 bool do_rel_wr, do_data_tag;
1660
1661 mmc_blk_data_prep(mq, mqrq, recovery_mode, &do_rel_wr, &do_data_tag);
1662
1663 brq->mrq.cmd = &brq->cmd;
1664
1665 brq->cmd.arg = blk_rq_pos(req);
1666 if (!mmc_card_blockaddr(card))
1667 brq->cmd.arg <<= 9;
1668 brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1669
1670 if (brq->data.blocks > 1 || do_rel_wr) {
1671 /* SPI multiblock writes terminate using a special
1672 * token, not a STOP_TRANSMISSION request.
1673 */
1674 if (!mmc_host_is_spi(card->host) ||
1675 rq_data_dir(req) == READ)
1676 brq->mrq.stop = &brq->stop;
1677 readcmd = MMC_READ_MULTIPLE_BLOCK;
1678 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1679 } else {
1680 brq->mrq.stop = NULL;
1681 readcmd = MMC_READ_SINGLE_BLOCK;
1682 writecmd = MMC_WRITE_BLOCK;
1683 }
1684 brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd;
1685
1686 /*
1687 * Pre-defined multi-block transfers are preferable to
1688 * open ended-ones (and necessary for reliable writes).
1689 * However, it is not sufficient to just send CMD23,
1690 * and avoid the final CMD12, as on an error condition
1691 * CMD12 (stop) needs to be sent anyway. This, coupled
1692 * with Auto-CMD23 enhancements provided by some
1693 * hosts, means that the complexity of dealing
1694 * with this is best left to the host. If CMD23 is
1695 * supported by card and host, we'll fill sbc in and let
1696 * the host deal with handling it correctly. This means
1697 * that for hosts that don't expose MMC_CAP_CMD23, no
1698 * change of behavior will be observed.
1699 *
1700 * N.B: Some MMC cards experience perf degradation.
1701 * We'll avoid using CMD23-bounded multiblock writes for
1702 * these, while retaining features like reliable writes.
1703 */
1704 if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1705 (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1706 do_data_tag)) {
1707 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1708 brq->sbc.arg = brq->data.blocks |
1709 (do_rel_wr ? (1 << 31) : 0) |
1710 (do_data_tag ? (1 << 29) : 0);
1711 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1712 brq->mrq.sbc = &brq->sbc;
1713 }
1714}
1715
1716#define MMC_MAX_RETRIES 5
1717#define MMC_DATA_RETRIES 2
1718#define MMC_NO_RETRIES (MMC_MAX_RETRIES + 1)
1719
1720static int mmc_blk_send_stop(struct mmc_card *card, unsigned int timeout)
1721{
1722 struct mmc_command cmd = {
1723 .opcode = MMC_STOP_TRANSMISSION,
1724 .flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC,
1725 /* Some hosts wait for busy anyway, so provide a busy timeout */
1726 .busy_timeout = timeout,
1727 };
1728
1729 return mmc_wait_for_cmd(card->host, &cmd, 5);
1730}
1731
1732static int mmc_blk_fix_state(struct mmc_card *card, struct request *req)
1733{
1734 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1735 struct mmc_blk_request *brq = &mqrq->brq;
1736 unsigned int timeout = mmc_blk_data_timeout_ms(card->host, &brq->data);
1737 int err;
1738
1739 mmc_retune_hold_now(card->host);
1740
1741 mmc_blk_send_stop(card, timeout);
1742
1743 err = mmc_poll_for_busy(card, timeout, false, MMC_BUSY_IO);
1744
1745 mmc_retune_release(card->host);
1746
1747 return err;
1748}
1749
1750#define MMC_READ_SINGLE_RETRIES 2
1751
1752/* Single (native) sector read during recovery */
1753static void mmc_blk_read_single(struct mmc_queue *mq, struct request *req)
1754{
1755 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1756 struct mmc_request *mrq = &mqrq->brq.mrq;
1757 struct mmc_card *card = mq->card;
1758 struct mmc_host *host = card->host;
1759 blk_status_t error = BLK_STS_OK;
1760 size_t bytes_per_read = queue_physical_block_size(mq->queue);
1761
1762 do {
1763 u32 status;
1764 int err;
1765 int retries = 0;
1766
1767 while (retries++ <= MMC_READ_SINGLE_RETRIES) {
1768 mmc_blk_rw_rq_prep(mqrq, card, 1, mq);
1769
1770 mmc_wait_for_req(host, mrq);
1771
1772 err = mmc_send_status(card, &status);
1773 if (err)
1774 goto error_exit;
1775
1776 if (!mmc_host_is_spi(host) &&
1777 !mmc_ready_for_data(status)) {
1778 err = mmc_blk_fix_state(card, req);
1779 if (err)
1780 goto error_exit;
1781 }
1782
1783 if (!mrq->cmd->error)
1784 break;
1785 }
1786
1787 if (mrq->cmd->error ||
1788 mrq->data->error ||
1789 (!mmc_host_is_spi(host) &&
1790 (mrq->cmd->resp[0] & CMD_ERRORS || status & CMD_ERRORS)))
1791 error = BLK_STS_IOERR;
1792 else
1793 error = BLK_STS_OK;
1794
1795 } while (blk_update_request(req, error, bytes_per_read));
1796
1797 return;
1798
1799error_exit:
1800 mrq->data->bytes_xfered = 0;
1801 blk_update_request(req, BLK_STS_IOERR, bytes_per_read);
1802 /* Let it try the remaining request again */
1803 if (mqrq->retries > MMC_MAX_RETRIES - 1)
1804 mqrq->retries = MMC_MAX_RETRIES - 1;
1805}
1806
1807static inline bool mmc_blk_oor_valid(struct mmc_blk_request *brq)
1808{
1809 return !!brq->mrq.sbc;
1810}
1811
1812static inline u32 mmc_blk_stop_err_bits(struct mmc_blk_request *brq)
1813{
1814 return mmc_blk_oor_valid(brq) ? CMD_ERRORS : CMD_ERRORS_EXCL_OOR;
1815}
1816
1817/*
1818 * Check for errors the host controller driver might not have seen such as
1819 * response mode errors or invalid card state.
1820 */
1821static bool mmc_blk_status_error(struct request *req, u32 status)
1822{
1823 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1824 struct mmc_blk_request *brq = &mqrq->brq;
1825 struct mmc_queue *mq = req->q->queuedata;
1826 u32 stop_err_bits;
1827
1828 if (mmc_host_is_spi(mq->card->host))
1829 return false;
1830
1831 stop_err_bits = mmc_blk_stop_err_bits(brq);
1832
1833 return brq->cmd.resp[0] & CMD_ERRORS ||
1834 brq->stop.resp[0] & stop_err_bits ||
1835 status & stop_err_bits ||
1836 (rq_data_dir(req) == WRITE && !mmc_ready_for_data(status));
1837}
1838
1839static inline bool mmc_blk_cmd_started(struct mmc_blk_request *brq)
1840{
1841 return !brq->sbc.error && !brq->cmd.error &&
1842 !(brq->cmd.resp[0] & CMD_ERRORS);
1843}
1844
1845/*
1846 * Requests are completed by mmc_blk_mq_complete_rq() which sets simple
1847 * policy:
1848 * 1. A request that has transferred at least some data is considered
1849 * successful and will be requeued if there is remaining data to
1850 * transfer.
1851 * 2. Otherwise the number of retries is incremented and the request
1852 * will be requeued if there are remaining retries.
1853 * 3. Otherwise the request will be errored out.
1854 * That means mmc_blk_mq_complete_rq() is controlled by bytes_xfered and
1855 * mqrq->retries. So there are only 4 possible actions here:
1856 * 1. do not accept the bytes_xfered value i.e. set it to zero
1857 * 2. change mqrq->retries to determine the number of retries
1858 * 3. try to reset the card
1859 * 4. read one sector at a time
1860 */
1861static void mmc_blk_mq_rw_recovery(struct mmc_queue *mq, struct request *req)
1862{
1863 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1864 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
1865 struct mmc_blk_request *brq = &mqrq->brq;
1866 struct mmc_blk_data *md = mq->blkdata;
1867 struct mmc_card *card = mq->card;
1868 u32 status;
1869 u32 blocks;
1870 int err;
1871
1872 /*
1873 * Some errors the host driver might not have seen. Set the number of
1874 * bytes transferred to zero in that case.
1875 */
1876 err = __mmc_send_status(card, &status, 0);
1877 if (err || mmc_blk_status_error(req, status))
1878 brq->data.bytes_xfered = 0;
1879
1880 mmc_retune_release(card->host);
1881
1882 /*
1883 * Try again to get the status. This also provides an opportunity for
1884 * re-tuning.
1885 */
1886 if (err)
1887 err = __mmc_send_status(card, &status, 0);
1888
1889 /*
1890 * Nothing more to do after the number of bytes transferred has been
1891 * updated and there is no card.
1892 */
1893 if (err && mmc_detect_card_removed(card->host))
1894 return;
1895
1896 /* Try to get back to "tran" state */
1897 if (!mmc_host_is_spi(mq->card->host) &&
1898 (err || !mmc_ready_for_data(status)))
1899 err = mmc_blk_fix_state(mq->card, req);
1900
1901 /*
1902 * Special case for SD cards where the card might record the number of
1903 * blocks written.
1904 */
1905 if (!err && mmc_blk_cmd_started(brq) && mmc_card_sd(card) &&
1906 rq_data_dir(req) == WRITE) {
1907 if (mmc_sd_num_wr_blocks(card, &blocks))
1908 brq->data.bytes_xfered = 0;
1909 else
1910 brq->data.bytes_xfered = blocks << 9;
1911 }
1912
1913 /* Reset if the card is in a bad state */
1914 if (!mmc_host_is_spi(mq->card->host) &&
1915 err && mmc_blk_reset(md, card->host, type)) {
1916 pr_err("%s: recovery failed!\n", req->q->disk->disk_name);
1917 mqrq->retries = MMC_NO_RETRIES;
1918 return;
1919 }
1920
1921 /*
1922 * If anything was done, just return and if there is anything remaining
1923 * on the request it will get requeued.
1924 */
1925 if (brq->data.bytes_xfered)
1926 return;
1927
1928 /* Reset before last retry */
1929 if (mqrq->retries + 1 == MMC_MAX_RETRIES &&
1930 mmc_blk_reset(md, card->host, type))
1931 return;
1932
1933 /* Command errors fail fast, so use all MMC_MAX_RETRIES */
1934 if (brq->sbc.error || brq->cmd.error)
1935 return;
1936
1937 /* Reduce the remaining retries for data errors */
1938 if (mqrq->retries < MMC_MAX_RETRIES - MMC_DATA_RETRIES) {
1939 mqrq->retries = MMC_MAX_RETRIES - MMC_DATA_RETRIES;
1940 return;
1941 }
1942
1943 if (rq_data_dir(req) == READ && brq->data.blocks >
1944 queue_physical_block_size(mq->queue) >> 9) {
1945 /* Read one (native) sector at a time */
1946 mmc_blk_read_single(mq, req);
1947 return;
1948 }
1949}
1950
1951static inline bool mmc_blk_rq_error(struct mmc_blk_request *brq)
1952{
1953 mmc_blk_eval_resp_error(brq);
1954
1955 return brq->sbc.error || brq->cmd.error || brq->stop.error ||
1956 brq->data.error || brq->cmd.resp[0] & CMD_ERRORS;
1957}
1958
1959static int mmc_spi_err_check(struct mmc_card *card)
1960{
1961 u32 status = 0;
1962 int err;
1963
1964 /*
1965 * SPI does not have a TRAN state we have to wait on, instead the
1966 * card is ready again when it no longer holds the line LOW.
1967 * We still have to ensure two things here before we know the write
1968 * was successful:
1969 * 1. The card has not disconnected during busy and we actually read our
1970 * own pull-up, thinking it was still connected, so ensure it
1971 * still responds.
1972 * 2. Check for any error bits, in particular R1_SPI_IDLE to catch a
1973 * just reconnected card after being disconnected during busy.
1974 */
1975 err = __mmc_send_status(card, &status, 0);
1976 if (err)
1977 return err;
1978 /* All R1 and R2 bits of SPI are errors in our case */
1979 if (status)
1980 return -EIO;
1981 return 0;
1982}
1983
1984static int mmc_blk_busy_cb(void *cb_data, bool *busy)
1985{
1986 struct mmc_blk_busy_data *data = cb_data;
1987 u32 status = 0;
1988 int err;
1989
1990 err = mmc_send_status(data->card, &status);
1991 if (err)
1992 return err;
1993
1994 /* Accumulate response error bits. */
1995 data->status |= status;
1996
1997 *busy = !mmc_ready_for_data(status);
1998 return 0;
1999}
2000
2001static int mmc_blk_card_busy(struct mmc_card *card, struct request *req)
2002{
2003 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2004 struct mmc_blk_busy_data cb_data;
2005 int err;
2006
2007 if (rq_data_dir(req) == READ)
2008 return 0;
2009
2010 if (mmc_host_is_spi(card->host)) {
2011 err = mmc_spi_err_check(card);
2012 if (err)
2013 mqrq->brq.data.bytes_xfered = 0;
2014 return err;
2015 }
2016
2017 cb_data.card = card;
2018 cb_data.status = 0;
2019 err = __mmc_poll_for_busy(card->host, 0, MMC_BLK_TIMEOUT_MS,
2020 &mmc_blk_busy_cb, &cb_data);
2021
2022 /*
2023 * Do not assume data transferred correctly if there are any error bits
2024 * set.
2025 */
2026 if (cb_data.status & mmc_blk_stop_err_bits(&mqrq->brq)) {
2027 mqrq->brq.data.bytes_xfered = 0;
2028 err = err ? err : -EIO;
2029 }
2030
2031 /* Copy the exception bit so it will be seen later on */
2032 if (mmc_card_mmc(card) && cb_data.status & R1_EXCEPTION_EVENT)
2033 mqrq->brq.cmd.resp[0] |= R1_EXCEPTION_EVENT;
2034
2035 return err;
2036}
2037
2038static inline void mmc_blk_rw_reset_success(struct mmc_queue *mq,
2039 struct request *req)
2040{
2041 int type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
2042
2043 mmc_blk_reset_success(mq->blkdata, type);
2044}
2045
2046static void mmc_blk_mq_complete_rq(struct mmc_queue *mq, struct request *req)
2047{
2048 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2049 unsigned int nr_bytes = mqrq->brq.data.bytes_xfered;
2050
2051 if (nr_bytes) {
2052 if (blk_update_request(req, BLK_STS_OK, nr_bytes))
2053 blk_mq_requeue_request(req, true);
2054 else
2055 __blk_mq_end_request(req, BLK_STS_OK);
2056 } else if (!blk_rq_bytes(req)) {
2057 __blk_mq_end_request(req, BLK_STS_IOERR);
2058 } else if (mqrq->retries++ < MMC_MAX_RETRIES) {
2059 blk_mq_requeue_request(req, true);
2060 } else {
2061 if (mmc_card_removed(mq->card))
2062 req->rq_flags |= RQF_QUIET;
2063 blk_mq_end_request(req, BLK_STS_IOERR);
2064 }
2065}
2066
2067static bool mmc_blk_urgent_bkops_needed(struct mmc_queue *mq,
2068 struct mmc_queue_req *mqrq)
2069{
2070 return mmc_card_mmc(mq->card) && !mmc_host_is_spi(mq->card->host) &&
2071 (mqrq->brq.cmd.resp[0] & R1_EXCEPTION_EVENT ||
2072 mqrq->brq.stop.resp[0] & R1_EXCEPTION_EVENT);
2073}
2074
2075static void mmc_blk_urgent_bkops(struct mmc_queue *mq,
2076 struct mmc_queue_req *mqrq)
2077{
2078 if (mmc_blk_urgent_bkops_needed(mq, mqrq))
2079 mmc_run_bkops(mq->card);
2080}
2081
2082static void mmc_blk_hsq_req_done(struct mmc_request *mrq)
2083{
2084 struct mmc_queue_req *mqrq =
2085 container_of(mrq, struct mmc_queue_req, brq.mrq);
2086 struct request *req = mmc_queue_req_to_req(mqrq);
2087 struct request_queue *q = req->q;
2088 struct mmc_queue *mq = q->queuedata;
2089 struct mmc_host *host = mq->card->host;
2090 unsigned long flags;
2091
2092 if (mmc_blk_rq_error(&mqrq->brq) ||
2093 mmc_blk_urgent_bkops_needed(mq, mqrq)) {
2094 spin_lock_irqsave(&mq->lock, flags);
2095 mq->recovery_needed = true;
2096 mq->recovery_req = req;
2097 spin_unlock_irqrestore(&mq->lock, flags);
2098
2099 host->cqe_ops->cqe_recovery_start(host);
2100
2101 schedule_work(&mq->recovery_work);
2102 return;
2103 }
2104
2105 mmc_blk_rw_reset_success(mq, req);
2106
2107 /*
2108 * Block layer timeouts race with completions which means the normal
2109 * completion path cannot be used during recovery.
2110 */
2111 if (mq->in_recovery)
2112 mmc_blk_cqe_complete_rq(mq, req);
2113 else if (likely(!blk_should_fake_timeout(req->q)))
2114 blk_mq_complete_request(req);
2115}
2116
2117void mmc_blk_mq_complete(struct request *req)
2118{
2119 struct mmc_queue *mq = req->q->queuedata;
2120 struct mmc_host *host = mq->card->host;
2121
2122 if (host->cqe_enabled)
2123 mmc_blk_cqe_complete_rq(mq, req);
2124 else if (likely(!blk_should_fake_timeout(req->q)))
2125 mmc_blk_mq_complete_rq(mq, req);
2126}
2127
2128static void mmc_blk_mq_poll_completion(struct mmc_queue *mq,
2129 struct request *req)
2130{
2131 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2132 struct mmc_host *host = mq->card->host;
2133
2134 if (mmc_blk_rq_error(&mqrq->brq) ||
2135 mmc_blk_card_busy(mq->card, req)) {
2136 mmc_blk_mq_rw_recovery(mq, req);
2137 } else {
2138 mmc_blk_rw_reset_success(mq, req);
2139 mmc_retune_release(host);
2140 }
2141
2142 mmc_blk_urgent_bkops(mq, mqrq);
2143}
2144
2145static void mmc_blk_mq_dec_in_flight(struct mmc_queue *mq, enum mmc_issue_type issue_type)
2146{
2147 unsigned long flags;
2148 bool put_card;
2149
2150 spin_lock_irqsave(&mq->lock, flags);
2151
2152 mq->in_flight[issue_type] -= 1;
2153
2154 put_card = (mmc_tot_in_flight(mq) == 0);
2155
2156 spin_unlock_irqrestore(&mq->lock, flags);
2157
2158 if (put_card)
2159 mmc_put_card(mq->card, &mq->ctx);
2160}
2161
2162static void mmc_blk_mq_post_req(struct mmc_queue *mq, struct request *req,
2163 bool can_sleep)
2164{
2165 enum mmc_issue_type issue_type = mmc_issue_type(mq, req);
2166 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2167 struct mmc_request *mrq = &mqrq->brq.mrq;
2168 struct mmc_host *host = mq->card->host;
2169
2170 mmc_post_req(host, mrq, 0);
2171
2172 /*
2173 * Block layer timeouts race with completions which means the normal
2174 * completion path cannot be used during recovery.
2175 */
2176 if (mq->in_recovery) {
2177 mmc_blk_mq_complete_rq(mq, req);
2178 } else if (likely(!blk_should_fake_timeout(req->q))) {
2179 if (can_sleep)
2180 blk_mq_complete_request_direct(req, mmc_blk_mq_complete);
2181 else
2182 blk_mq_complete_request(req);
2183 }
2184
2185 mmc_blk_mq_dec_in_flight(mq, issue_type);
2186}
2187
2188void mmc_blk_mq_recovery(struct mmc_queue *mq)
2189{
2190 struct request *req = mq->recovery_req;
2191 struct mmc_host *host = mq->card->host;
2192 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2193
2194 mq->recovery_req = NULL;
2195 mq->rw_wait = false;
2196
2197 if (mmc_blk_rq_error(&mqrq->brq)) {
2198 mmc_retune_hold_now(host);
2199 mmc_blk_mq_rw_recovery(mq, req);
2200 }
2201
2202 mmc_blk_urgent_bkops(mq, mqrq);
2203
2204 mmc_blk_mq_post_req(mq, req, true);
2205}
2206
2207static void mmc_blk_mq_complete_prev_req(struct mmc_queue *mq,
2208 struct request **prev_req)
2209{
2210 if (mmc_host_done_complete(mq->card->host))
2211 return;
2212
2213 mutex_lock(&mq->complete_lock);
2214
2215 if (!mq->complete_req)
2216 goto out_unlock;
2217
2218 mmc_blk_mq_poll_completion(mq, mq->complete_req);
2219
2220 if (prev_req)
2221 *prev_req = mq->complete_req;
2222 else
2223 mmc_blk_mq_post_req(mq, mq->complete_req, true);
2224
2225 mq->complete_req = NULL;
2226
2227out_unlock:
2228 mutex_unlock(&mq->complete_lock);
2229}
2230
2231void mmc_blk_mq_complete_work(struct work_struct *work)
2232{
2233 struct mmc_queue *mq = container_of(work, struct mmc_queue,
2234 complete_work);
2235
2236 mmc_blk_mq_complete_prev_req(mq, NULL);
2237}
2238
2239static void mmc_blk_mq_req_done(struct mmc_request *mrq)
2240{
2241 struct mmc_queue_req *mqrq = container_of(mrq, struct mmc_queue_req,
2242 brq.mrq);
2243 struct request *req = mmc_queue_req_to_req(mqrq);
2244 struct request_queue *q = req->q;
2245 struct mmc_queue *mq = q->queuedata;
2246 struct mmc_host *host = mq->card->host;
2247 unsigned long flags;
2248
2249 if (!mmc_host_done_complete(host)) {
2250 bool waiting;
2251
2252 /*
2253 * We cannot complete the request in this context, so record
2254 * that there is a request to complete, and that a following
2255 * request does not need to wait (although it does need to
2256 * complete complete_req first).
2257 */
2258 spin_lock_irqsave(&mq->lock, flags);
2259 mq->complete_req = req;
2260 mq->rw_wait = false;
2261 waiting = mq->waiting;
2262 spin_unlock_irqrestore(&mq->lock, flags);
2263
2264 /*
2265 * If 'waiting' then the waiting task will complete this
2266 * request, otherwise queue a work to do it. Note that
2267 * complete_work may still race with the dispatch of a following
2268 * request.
2269 */
2270 if (waiting)
2271 wake_up(&mq->wait);
2272 else
2273 queue_work(mq->card->complete_wq, &mq->complete_work);
2274
2275 return;
2276 }
2277
2278 /* Take the recovery path for errors or urgent background operations */
2279 if (mmc_blk_rq_error(&mqrq->brq) ||
2280 mmc_blk_urgent_bkops_needed(mq, mqrq)) {
2281 spin_lock_irqsave(&mq->lock, flags);
2282 mq->recovery_needed = true;
2283 mq->recovery_req = req;
2284 spin_unlock_irqrestore(&mq->lock, flags);
2285 wake_up(&mq->wait);
2286 schedule_work(&mq->recovery_work);
2287 return;
2288 }
2289
2290 mmc_blk_rw_reset_success(mq, req);
2291
2292 mq->rw_wait = false;
2293 wake_up(&mq->wait);
2294
2295 /* context unknown */
2296 mmc_blk_mq_post_req(mq, req, false);
2297}
2298
2299static bool mmc_blk_rw_wait_cond(struct mmc_queue *mq, int *err)
2300{
2301 unsigned long flags;
2302 bool done;
2303
2304 /*
2305 * Wait while there is another request in progress, but not if recovery
2306 * is needed. Also indicate whether there is a request waiting to start.
2307 */
2308 spin_lock_irqsave(&mq->lock, flags);
2309 if (mq->recovery_needed) {
2310 *err = -EBUSY;
2311 done = true;
2312 } else {
2313 done = !mq->rw_wait;
2314 }
2315 mq->waiting = !done;
2316 spin_unlock_irqrestore(&mq->lock, flags);
2317
2318 return done;
2319}
2320
2321static int mmc_blk_rw_wait(struct mmc_queue *mq, struct request **prev_req)
2322{
2323 int err = 0;
2324
2325 wait_event(mq->wait, mmc_blk_rw_wait_cond(mq, &err));
2326
2327 /* Always complete the previous request if there is one */
2328 mmc_blk_mq_complete_prev_req(mq, prev_req);
2329
2330 return err;
2331}
2332
2333static int mmc_blk_mq_issue_rw_rq(struct mmc_queue *mq,
2334 struct request *req)
2335{
2336 struct mmc_queue_req *mqrq = req_to_mmc_queue_req(req);
2337 struct mmc_host *host = mq->card->host;
2338 struct request *prev_req = NULL;
2339 int err = 0;
2340
2341 mmc_blk_rw_rq_prep(mqrq, mq->card, 0, mq);
2342
2343 mqrq->brq.mrq.done = mmc_blk_mq_req_done;
2344
2345 mmc_pre_req(host, &mqrq->brq.mrq);
2346
2347 err = mmc_blk_rw_wait(mq, &prev_req);
2348 if (err)
2349 goto out_post_req;
2350
2351 mq->rw_wait = true;
2352
2353 err = mmc_start_request(host, &mqrq->brq.mrq);
2354
2355 if (prev_req)
2356 mmc_blk_mq_post_req(mq, prev_req, true);
2357
2358 if (err)
2359 mq->rw_wait = false;
2360
2361 /* Release re-tuning here where there is no synchronization required */
2362 if (err || mmc_host_done_complete(host))
2363 mmc_retune_release(host);
2364
2365out_post_req:
2366 if (err)
2367 mmc_post_req(host, &mqrq->brq.mrq, err);
2368
2369 return err;
2370}
2371
2372static int mmc_blk_wait_for_idle(struct mmc_queue *mq, struct mmc_host *host)
2373{
2374 if (host->cqe_enabled)
2375 return host->cqe_ops->cqe_wait_for_idle(host);
2376
2377 return mmc_blk_rw_wait(mq, NULL);
2378}
2379
2380enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req)
2381{
2382 struct mmc_blk_data *md = mq->blkdata;
2383 struct mmc_card *card = md->queue.card;
2384 struct mmc_host *host = card->host;
2385 int ret;
2386
2387 ret = mmc_blk_part_switch(card, md->part_type);
2388 if (ret)
2389 return MMC_REQ_FAILED_TO_START;
2390
2391 switch (mmc_issue_type(mq, req)) {
2392 case MMC_ISSUE_SYNC:
2393 ret = mmc_blk_wait_for_idle(mq, host);
2394 if (ret)
2395 return MMC_REQ_BUSY;
2396 switch (req_op(req)) {
2397 case REQ_OP_DRV_IN:
2398 case REQ_OP_DRV_OUT:
2399 mmc_blk_issue_drv_op(mq, req);
2400 break;
2401 case REQ_OP_DISCARD:
2402 mmc_blk_issue_discard_rq(mq, req);
2403 break;
2404 case REQ_OP_SECURE_ERASE:
2405 mmc_blk_issue_secdiscard_rq(mq, req);
2406 break;
2407 case REQ_OP_WRITE_ZEROES:
2408 mmc_blk_issue_trim_rq(mq, req);
2409 break;
2410 case REQ_OP_FLUSH:
2411 mmc_blk_issue_flush(mq, req);
2412 break;
2413 default:
2414 WARN_ON_ONCE(1);
2415 return MMC_REQ_FAILED_TO_START;
2416 }
2417 return MMC_REQ_FINISHED;
2418 case MMC_ISSUE_DCMD:
2419 case MMC_ISSUE_ASYNC:
2420 switch (req_op(req)) {
2421 case REQ_OP_FLUSH:
2422 if (!mmc_cache_enabled(host)) {
2423 blk_mq_end_request(req, BLK_STS_OK);
2424 return MMC_REQ_FINISHED;
2425 }
2426 ret = mmc_blk_cqe_issue_flush(mq, req);
2427 break;
2428 case REQ_OP_WRITE:
2429 card->written_flag = true;
2430 fallthrough;
2431 case REQ_OP_READ:
2432 if (host->cqe_enabled)
2433 ret = mmc_blk_cqe_issue_rw_rq(mq, req);
2434 else
2435 ret = mmc_blk_mq_issue_rw_rq(mq, req);
2436 break;
2437 default:
2438 WARN_ON_ONCE(1);
2439 ret = -EINVAL;
2440 }
2441 if (!ret)
2442 return MMC_REQ_STARTED;
2443 return ret == -EBUSY ? MMC_REQ_BUSY : MMC_REQ_FAILED_TO_START;
2444 default:
2445 WARN_ON_ONCE(1);
2446 return MMC_REQ_FAILED_TO_START;
2447 }
2448}
2449
2450static inline int mmc_blk_readonly(struct mmc_card *card)
2451{
2452 return mmc_card_readonly(card) ||
2453 !(card->csd.cmdclass & CCC_BLOCK_WRITE);
2454}
2455
2456static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
2457 struct device *parent,
2458 sector_t size,
2459 bool default_ro,
2460 const char *subname,
2461 int area_type,
2462 unsigned int part_type)
2463{
2464 struct mmc_blk_data *md;
2465 int devidx, ret;
2466 char cap_str[10];
2467 bool cache_enabled = false;
2468 bool fua_enabled = false;
2469
2470 devidx = ida_simple_get(&mmc_blk_ida, 0, max_devices, GFP_KERNEL);
2471 if (devidx < 0) {
2472 /*
2473 * We get -ENOSPC because there are no more any available
2474 * devidx. The reason may be that, either userspace haven't yet
2475 * unmounted the partitions, which postpones mmc_blk_release()
2476 * from being called, or the device has more partitions than
2477 * what we support.
2478 */
2479 if (devidx == -ENOSPC)
2480 dev_err(mmc_dev(card->host),
2481 "no more device IDs available\n");
2482
2483 return ERR_PTR(devidx);
2484 }
2485
2486 md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
2487 if (!md) {
2488 ret = -ENOMEM;
2489 goto out;
2490 }
2491
2492 md->area_type = area_type;
2493
2494 /*
2495 * Set the read-only status based on the supported commands
2496 * and the write protect switch.
2497 */
2498 md->read_only = mmc_blk_readonly(card);
2499
2500 md->disk = mmc_init_queue(&md->queue, card);
2501 if (IS_ERR(md->disk)) {
2502 ret = PTR_ERR(md->disk);
2503 goto err_kfree;
2504 }
2505
2506 INIT_LIST_HEAD(&md->part);
2507 INIT_LIST_HEAD(&md->rpmbs);
2508 kref_init(&md->kref);
2509
2510 md->queue.blkdata = md;
2511 md->part_type = part_type;
2512
2513 md->disk->major = MMC_BLOCK_MAJOR;
2514 md->disk->minors = perdev_minors;
2515 md->disk->first_minor = devidx * perdev_minors;
2516 md->disk->fops = &mmc_bdops;
2517 md->disk->private_data = md;
2518 md->parent = parent;
2519 set_disk_ro(md->disk, md->read_only || default_ro);
2520 if (area_type & (MMC_BLK_DATA_AREA_RPMB | MMC_BLK_DATA_AREA_BOOT))
2521 md->disk->flags |= GENHD_FL_NO_PART;
2522
2523 /*
2524 * As discussed on lkml, GENHD_FL_REMOVABLE should:
2525 *
2526 * - be set for removable media with permanent block devices
2527 * - be unset for removable block devices with permanent media
2528 *
2529 * Since MMC block devices clearly fall under the second
2530 * case, we do not set GENHD_FL_REMOVABLE. Userspace
2531 * should use the block device creation/destruction hotplug
2532 * messages to tell when the card is present.
2533 */
2534
2535 snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2536 "mmcblk%u%s", card->host->index, subname ? subname : "");
2537
2538 set_capacity(md->disk, size);
2539
2540 if (mmc_host_cmd23(card->host)) {
2541 if ((mmc_card_mmc(card) &&
2542 card->csd.mmca_vsn >= CSD_SPEC_VER_3) ||
2543 (mmc_card_sd(card) &&
2544 card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2545 md->flags |= MMC_BLK_CMD23;
2546 }
2547
2548 if (md->flags & MMC_BLK_CMD23 &&
2549 ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2550 card->ext_csd.rel_sectors)) {
2551 md->flags |= MMC_BLK_REL_WR;
2552 fua_enabled = true;
2553 cache_enabled = true;
2554 }
2555 if (mmc_cache_enabled(card->host))
2556 cache_enabled = true;
2557
2558 blk_queue_write_cache(md->queue.queue, cache_enabled, fua_enabled);
2559
2560 string_get_size((u64)size, 512, STRING_UNITS_2,
2561 cap_str, sizeof(cap_str));
2562 pr_info("%s: %s %s %s%s\n",
2563 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2564 cap_str, md->read_only ? " (ro)" : "");
2565
2566 /* used in ->open, must be set before add_disk: */
2567 if (area_type == MMC_BLK_DATA_AREA_MAIN)
2568 dev_set_drvdata(&card->dev, md);
2569 ret = device_add_disk(md->parent, md->disk, mmc_disk_attr_groups);
2570 if (ret)
2571 goto err_put_disk;
2572 return md;
2573
2574 err_put_disk:
2575 put_disk(md->disk);
2576 blk_mq_free_tag_set(&md->queue.tag_set);
2577 err_kfree:
2578 kfree(md);
2579 out:
2580 ida_simple_remove(&mmc_blk_ida, devidx);
2581 return ERR_PTR(ret);
2582}
2583
2584static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2585{
2586 sector_t size;
2587
2588 if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2589 /*
2590 * The EXT_CSD sector count is in number or 512 byte
2591 * sectors.
2592 */
2593 size = card->ext_csd.sectors;
2594 } else {
2595 /*
2596 * The CSD capacity field is in units of read_blkbits.
2597 * set_capacity takes units of 512 bytes.
2598 */
2599 size = (typeof(sector_t))card->csd.capacity
2600 << (card->csd.read_blkbits - 9);
2601 }
2602
2603 return mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2604 MMC_BLK_DATA_AREA_MAIN, 0);
2605}
2606
2607static int mmc_blk_alloc_part(struct mmc_card *card,
2608 struct mmc_blk_data *md,
2609 unsigned int part_type,
2610 sector_t size,
2611 bool default_ro,
2612 const char *subname,
2613 int area_type)
2614{
2615 struct mmc_blk_data *part_md;
2616
2617 part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2618 subname, area_type, part_type);
2619 if (IS_ERR(part_md))
2620 return PTR_ERR(part_md);
2621 list_add(&part_md->part, &md->part);
2622
2623 return 0;
2624}
2625
2626/**
2627 * mmc_rpmb_ioctl() - ioctl handler for the RPMB chardev
2628 * @filp: the character device file
2629 * @cmd: the ioctl() command
2630 * @arg: the argument from userspace
2631 *
2632 * This will essentially just redirect the ioctl()s coming in over to
2633 * the main block device spawning the RPMB character device.
2634 */
2635static long mmc_rpmb_ioctl(struct file *filp, unsigned int cmd,
2636 unsigned long arg)
2637{
2638 struct mmc_rpmb_data *rpmb = filp->private_data;
2639 int ret;
2640
2641 switch (cmd) {
2642 case MMC_IOC_CMD:
2643 ret = mmc_blk_ioctl_cmd(rpmb->md,
2644 (struct mmc_ioc_cmd __user *)arg,
2645 rpmb);
2646 break;
2647 case MMC_IOC_MULTI_CMD:
2648 ret = mmc_blk_ioctl_multi_cmd(rpmb->md,
2649 (struct mmc_ioc_multi_cmd __user *)arg,
2650 rpmb);
2651 break;
2652 default:
2653 ret = -EINVAL;
2654 break;
2655 }
2656
2657 return ret;
2658}
2659
2660#ifdef CONFIG_COMPAT
2661static long mmc_rpmb_ioctl_compat(struct file *filp, unsigned int cmd,
2662 unsigned long arg)
2663{
2664 return mmc_rpmb_ioctl(filp, cmd, (unsigned long)compat_ptr(arg));
2665}
2666#endif
2667
2668static int mmc_rpmb_chrdev_open(struct inode *inode, struct file *filp)
2669{
2670 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2671 struct mmc_rpmb_data, chrdev);
2672
2673 get_device(&rpmb->dev);
2674 filp->private_data = rpmb;
2675 mmc_blk_get(rpmb->md->disk);
2676
2677 return nonseekable_open(inode, filp);
2678}
2679
2680static int mmc_rpmb_chrdev_release(struct inode *inode, struct file *filp)
2681{
2682 struct mmc_rpmb_data *rpmb = container_of(inode->i_cdev,
2683 struct mmc_rpmb_data, chrdev);
2684
2685 mmc_blk_put(rpmb->md);
2686 put_device(&rpmb->dev);
2687
2688 return 0;
2689}
2690
2691static const struct file_operations mmc_rpmb_fileops = {
2692 .release = mmc_rpmb_chrdev_release,
2693 .open = mmc_rpmb_chrdev_open,
2694 .owner = THIS_MODULE,
2695 .llseek = no_llseek,
2696 .unlocked_ioctl = mmc_rpmb_ioctl,
2697#ifdef CONFIG_COMPAT
2698 .compat_ioctl = mmc_rpmb_ioctl_compat,
2699#endif
2700};
2701
2702static void mmc_blk_rpmb_device_release(struct device *dev)
2703{
2704 struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev);
2705
2706 ida_simple_remove(&mmc_rpmb_ida, rpmb->id);
2707 kfree(rpmb);
2708}
2709
2710static int mmc_blk_alloc_rpmb_part(struct mmc_card *card,
2711 struct mmc_blk_data *md,
2712 unsigned int part_index,
2713 sector_t size,
2714 const char *subname)
2715{
2716 int devidx, ret;
2717 char rpmb_name[DISK_NAME_LEN];
2718 char cap_str[10];
2719 struct mmc_rpmb_data *rpmb;
2720
2721 /* This creates the minor number for the RPMB char device */
2722 devidx = ida_simple_get(&mmc_rpmb_ida, 0, max_devices, GFP_KERNEL);
2723 if (devidx < 0)
2724 return devidx;
2725
2726 rpmb = kzalloc(sizeof(*rpmb), GFP_KERNEL);
2727 if (!rpmb) {
2728 ida_simple_remove(&mmc_rpmb_ida, devidx);
2729 return -ENOMEM;
2730 }
2731
2732 snprintf(rpmb_name, sizeof(rpmb_name),
2733 "mmcblk%u%s", card->host->index, subname ? subname : "");
2734
2735 rpmb->id = devidx;
2736 rpmb->part_index = part_index;
2737 rpmb->dev.init_name = rpmb_name;
2738 rpmb->dev.bus = &mmc_rpmb_bus_type;
2739 rpmb->dev.devt = MKDEV(MAJOR(mmc_rpmb_devt), rpmb->id);
2740 rpmb->dev.parent = &card->dev;
2741 rpmb->dev.release = mmc_blk_rpmb_device_release;
2742 device_initialize(&rpmb->dev);
2743 dev_set_drvdata(&rpmb->dev, rpmb);
2744 rpmb->md = md;
2745
2746 cdev_init(&rpmb->chrdev, &mmc_rpmb_fileops);
2747 rpmb->chrdev.owner = THIS_MODULE;
2748 ret = cdev_device_add(&rpmb->chrdev, &rpmb->dev);
2749 if (ret) {
2750 pr_err("%s: could not add character device\n", rpmb_name);
2751 goto out_put_device;
2752 }
2753
2754 list_add(&rpmb->node, &md->rpmbs);
2755
2756 string_get_size((u64)size, 512, STRING_UNITS_2,
2757 cap_str, sizeof(cap_str));
2758
2759 pr_info("%s: %s %s %s, chardev (%d:%d)\n",
2760 rpmb_name, mmc_card_id(card), mmc_card_name(card), cap_str,
2761 MAJOR(mmc_rpmb_devt), rpmb->id);
2762
2763 return 0;
2764
2765out_put_device:
2766 put_device(&rpmb->dev);
2767 return ret;
2768}
2769
2770static void mmc_blk_remove_rpmb_part(struct mmc_rpmb_data *rpmb)
2771
2772{
2773 cdev_device_del(&rpmb->chrdev, &rpmb->dev);
2774 put_device(&rpmb->dev);
2775}
2776
2777/* MMC Physical partitions consist of two boot partitions and
2778 * up to four general purpose partitions.
2779 * For each partition enabled in EXT_CSD a block device will be allocatedi
2780 * to provide access to the partition.
2781 */
2782
2783static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2784{
2785 int idx, ret;
2786
2787 if (!mmc_card_mmc(card))
2788 return 0;
2789
2790 for (idx = 0; idx < card->nr_parts; idx++) {
2791 if (card->part[idx].area_type & MMC_BLK_DATA_AREA_RPMB) {
2792 /*
2793 * RPMB partitions does not provide block access, they
2794 * are only accessed using ioctl():s. Thus create
2795 * special RPMB block devices that do not have a
2796 * backing block queue for these.
2797 */
2798 ret = mmc_blk_alloc_rpmb_part(card, md,
2799 card->part[idx].part_cfg,
2800 card->part[idx].size >> 9,
2801 card->part[idx].name);
2802 if (ret)
2803 return ret;
2804 } else if (card->part[idx].size) {
2805 ret = mmc_blk_alloc_part(card, md,
2806 card->part[idx].part_cfg,
2807 card->part[idx].size >> 9,
2808 card->part[idx].force_ro,
2809 card->part[idx].name,
2810 card->part[idx].area_type);
2811 if (ret)
2812 return ret;
2813 }
2814 }
2815
2816 return 0;
2817}
2818
2819static void mmc_blk_remove_req(struct mmc_blk_data *md)
2820{
2821 /*
2822 * Flush remaining requests and free queues. It is freeing the queue
2823 * that stops new requests from being accepted.
2824 */
2825 del_gendisk(md->disk);
2826 mmc_cleanup_queue(&md->queue);
2827 mmc_blk_put(md);
2828}
2829
2830static void mmc_blk_remove_parts(struct mmc_card *card,
2831 struct mmc_blk_data *md)
2832{
2833 struct list_head *pos, *q;
2834 struct mmc_blk_data *part_md;
2835 struct mmc_rpmb_data *rpmb;
2836
2837 /* Remove RPMB partitions */
2838 list_for_each_safe(pos, q, &md->rpmbs) {
2839 rpmb = list_entry(pos, struct mmc_rpmb_data, node);
2840 list_del(pos);
2841 mmc_blk_remove_rpmb_part(rpmb);
2842 }
2843 /* Remove block partitions */
2844 list_for_each_safe(pos, q, &md->part) {
2845 part_md = list_entry(pos, struct mmc_blk_data, part);
2846 list_del(pos);
2847 mmc_blk_remove_req(part_md);
2848 }
2849}
2850
2851#ifdef CONFIG_DEBUG_FS
2852
2853static int mmc_dbg_card_status_get(void *data, u64 *val)
2854{
2855 struct mmc_card *card = data;
2856 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2857 struct mmc_queue *mq = &md->queue;
2858 struct request *req;
2859 int ret;
2860
2861 /* Ask the block layer about the card status */
2862 req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_IN, 0);
2863 if (IS_ERR(req))
2864 return PTR_ERR(req);
2865 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_CARD_STATUS;
2866 req_to_mmc_queue_req(req)->drv_op_result = -EIO;
2867 blk_execute_rq(req, false);
2868 ret = req_to_mmc_queue_req(req)->drv_op_result;
2869 if (ret >= 0) {
2870 *val = ret;
2871 ret = 0;
2872 }
2873 blk_mq_free_request(req);
2874
2875 return ret;
2876}
2877DEFINE_DEBUGFS_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
2878 NULL, "%08llx\n");
2879
2880/* That is two digits * 512 + 1 for newline */
2881#define EXT_CSD_STR_LEN 1025
2882
2883static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
2884{
2885 struct mmc_card *card = inode->i_private;
2886 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
2887 struct mmc_queue *mq = &md->queue;
2888 struct request *req;
2889 char *buf;
2890 ssize_t n = 0;
2891 u8 *ext_csd;
2892 int err, i;
2893
2894 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
2895 if (!buf)
2896 return -ENOMEM;
2897
2898 /* Ask the block layer for the EXT CSD */
2899 req = blk_mq_alloc_request(mq->queue, REQ_OP_DRV_IN, 0);
2900 if (IS_ERR(req)) {
2901 err = PTR_ERR(req);
2902 goto out_free;
2903 }
2904 req_to_mmc_queue_req(req)->drv_op = MMC_DRV_OP_GET_EXT_CSD;
2905 req_to_mmc_queue_req(req)->drv_op_result = -EIO;
2906 req_to_mmc_queue_req(req)->drv_op_data = &ext_csd;
2907 blk_execute_rq(req, false);
2908 err = req_to_mmc_queue_req(req)->drv_op_result;
2909 blk_mq_free_request(req);
2910 if (err) {
2911 pr_err("FAILED %d\n", err);
2912 goto out_free;
2913 }
2914
2915 for (i = 0; i < 512; i++)
2916 n += sprintf(buf + n, "%02x", ext_csd[i]);
2917 n += sprintf(buf + n, "\n");
2918
2919 if (n != EXT_CSD_STR_LEN) {
2920 err = -EINVAL;
2921 kfree(ext_csd);
2922 goto out_free;
2923 }
2924
2925 filp->private_data = buf;
2926 kfree(ext_csd);
2927 return 0;
2928
2929out_free:
2930 kfree(buf);
2931 return err;
2932}
2933
2934static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
2935 size_t cnt, loff_t *ppos)
2936{
2937 char *buf = filp->private_data;
2938
2939 return simple_read_from_buffer(ubuf, cnt, ppos,
2940 buf, EXT_CSD_STR_LEN);
2941}
2942
2943static int mmc_ext_csd_release(struct inode *inode, struct file *file)
2944{
2945 kfree(file->private_data);
2946 return 0;
2947}
2948
2949static const struct file_operations mmc_dbg_ext_csd_fops = {
2950 .open = mmc_ext_csd_open,
2951 .read = mmc_ext_csd_read,
2952 .release = mmc_ext_csd_release,
2953 .llseek = default_llseek,
2954};
2955
2956static void mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
2957{
2958 struct dentry *root;
2959
2960 if (!card->debugfs_root)
2961 return;
2962
2963 root = card->debugfs_root;
2964
2965 if (mmc_card_mmc(card) || mmc_card_sd(card)) {
2966 md->status_dentry =
2967 debugfs_create_file_unsafe("status", 0400, root,
2968 card,
2969 &mmc_dbg_card_status_fops);
2970 }
2971
2972 if (mmc_card_mmc(card)) {
2973 md->ext_csd_dentry =
2974 debugfs_create_file("ext_csd", S_IRUSR, root, card,
2975 &mmc_dbg_ext_csd_fops);
2976 }
2977}
2978
2979static void mmc_blk_remove_debugfs(struct mmc_card *card,
2980 struct mmc_blk_data *md)
2981{
2982 if (!card->debugfs_root)
2983 return;
2984
2985 debugfs_remove(md->status_dentry);
2986 md->status_dentry = NULL;
2987
2988 debugfs_remove(md->ext_csd_dentry);
2989 md->ext_csd_dentry = NULL;
2990}
2991
2992#else
2993
2994static void mmc_blk_add_debugfs(struct mmc_card *card, struct mmc_blk_data *md)
2995{
2996}
2997
2998static void mmc_blk_remove_debugfs(struct mmc_card *card,
2999 struct mmc_blk_data *md)
3000{
3001}
3002
3003#endif /* CONFIG_DEBUG_FS */
3004
3005static int mmc_blk_probe(struct mmc_card *card)
3006{
3007 struct mmc_blk_data *md;
3008 int ret = 0;
3009
3010 /*
3011 * Check that the card supports the command class(es) we need.
3012 */
3013 if (!(card->csd.cmdclass & CCC_BLOCK_READ))
3014 return -ENODEV;
3015
3016 mmc_fixup_device(card, mmc_blk_fixups);
3017
3018 card->complete_wq = alloc_workqueue("mmc_complete",
3019 WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
3020 if (!card->complete_wq) {
3021 pr_err("Failed to create mmc completion workqueue");
3022 return -ENOMEM;
3023 }
3024
3025 md = mmc_blk_alloc(card);
3026 if (IS_ERR(md)) {
3027 ret = PTR_ERR(md);
3028 goto out_free;
3029 }
3030
3031 ret = mmc_blk_alloc_parts(card, md);
3032 if (ret)
3033 goto out;
3034
3035 /* Add two debugfs entries */
3036 mmc_blk_add_debugfs(card, md);
3037
3038 pm_runtime_set_autosuspend_delay(&card->dev, 3000);
3039 pm_runtime_use_autosuspend(&card->dev);
3040
3041 /*
3042 * Don't enable runtime PM for SD-combo cards here. Leave that
3043 * decision to be taken during the SDIO init sequence instead.
3044 */
3045 if (!mmc_card_sd_combo(card)) {
3046 pm_runtime_set_active(&card->dev);
3047 pm_runtime_enable(&card->dev);
3048 }
3049
3050 return 0;
3051
3052out:
3053 mmc_blk_remove_parts(card, md);
3054 mmc_blk_remove_req(md);
3055out_free:
3056 destroy_workqueue(card->complete_wq);
3057 return ret;
3058}
3059
3060static void mmc_blk_remove(struct mmc_card *card)
3061{
3062 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
3063
3064 mmc_blk_remove_debugfs(card, md);
3065 mmc_blk_remove_parts(card, md);
3066 pm_runtime_get_sync(&card->dev);
3067 if (md->part_curr != md->part_type) {
3068 mmc_claim_host(card->host);
3069 mmc_blk_part_switch(card, md->part_type);
3070 mmc_release_host(card->host);
3071 }
3072 if (!mmc_card_sd_combo(card))
3073 pm_runtime_disable(&card->dev);
3074 pm_runtime_put_noidle(&card->dev);
3075 mmc_blk_remove_req(md);
3076 destroy_workqueue(card->complete_wq);
3077}
3078
3079static int _mmc_blk_suspend(struct mmc_card *card)
3080{
3081 struct mmc_blk_data *part_md;
3082 struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
3083
3084 if (md) {
3085 mmc_queue_suspend(&md->queue);
3086 list_for_each_entry(part_md, &md->part, part) {
3087 mmc_queue_suspend(&part_md->queue);
3088 }
3089 }
3090 return 0;
3091}
3092
3093static void mmc_blk_shutdown(struct mmc_card *card)
3094{
3095 _mmc_blk_suspend(card);
3096}
3097
3098#ifdef CONFIG_PM_SLEEP
3099static int mmc_blk_suspend(struct device *dev)
3100{
3101 struct mmc_card *card = mmc_dev_to_card(dev);
3102
3103 return _mmc_blk_suspend(card);
3104}
3105
3106static int mmc_blk_resume(struct device *dev)
3107{
3108 struct mmc_blk_data *part_md;
3109 struct mmc_blk_data *md = dev_get_drvdata(dev);
3110
3111 if (md) {
3112 /*
3113 * Resume involves the card going into idle state,
3114 * so current partition is always the main one.
3115 */
3116 md->part_curr = md->part_type;
3117 mmc_queue_resume(&md->queue);
3118 list_for_each_entry(part_md, &md->part, part) {
3119 mmc_queue_resume(&part_md->queue);
3120 }
3121 }
3122 return 0;
3123}
3124#endif
3125
3126static SIMPLE_DEV_PM_OPS(mmc_blk_pm_ops, mmc_blk_suspend, mmc_blk_resume);
3127
3128static struct mmc_driver mmc_driver = {
3129 .drv = {
3130 .name = "mmcblk",
3131 .pm = &mmc_blk_pm_ops,
3132 },
3133 .probe = mmc_blk_probe,
3134 .remove = mmc_blk_remove,
3135 .shutdown = mmc_blk_shutdown,
3136};
3137
3138static int __init mmc_blk_init(void)
3139{
3140 int res;
3141
3142 res = bus_register(&mmc_rpmb_bus_type);
3143 if (res < 0) {
3144 pr_err("mmcblk: could not register RPMB bus type\n");
3145 return res;
3146 }
3147 res = alloc_chrdev_region(&mmc_rpmb_devt, 0, MAX_DEVICES, "rpmb");
3148 if (res < 0) {
3149 pr_err("mmcblk: failed to allocate rpmb chrdev region\n");
3150 goto out_bus_unreg;
3151 }
3152
3153 if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
3154 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
3155
3156 max_devices = min(MAX_DEVICES, (1 << MINORBITS) / perdev_minors);
3157
3158 res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
3159 if (res)
3160 goto out_chrdev_unreg;
3161
3162 res = mmc_register_driver(&mmc_driver);
3163 if (res)
3164 goto out_blkdev_unreg;
3165
3166 return 0;
3167
3168out_blkdev_unreg:
3169 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3170out_chrdev_unreg:
3171 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3172out_bus_unreg:
3173 bus_unregister(&mmc_rpmb_bus_type);
3174 return res;
3175}
3176
3177static void __exit mmc_blk_exit(void)
3178{
3179 mmc_unregister_driver(&mmc_driver);
3180 unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
3181 unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES);
3182 bus_unregister(&mmc_rpmb_bus_type);
3183}
3184
3185module_init(mmc_blk_init);
3186module_exit(mmc_blk_exit);
3187
3188MODULE_LICENSE("GPL");
3189MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");