Merge tag 'mmc-updates-for-3.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel...
[~shefty/rdma-dev.git] / drivers / mmc / card / block.c
1 /*
2  * Block driver for media (i.e., flash cards)
3  *
4  * Copyright 2002 Hewlett-Packard Company
5  * Copyright 2005-2008 Pierre Ossman
6  *
7  * Use consistent with the GNU GPL is permitted,
8  * provided that this copyright notice is
9  * preserved in its entirety in all copies and derived works.
10  *
11  * HEWLETT-PACKARD COMPANY MAKES NO WARRANTIES, EXPRESSED OR IMPLIED,
12  * AS TO THE USEFULNESS OR CORRECTNESS OF THIS CODE OR ITS
13  * FITNESS FOR ANY PARTICULAR PURPOSE.
14  *
15  * Many thanks to Alessandro Rubini and Jonathan Corbet!
16  *
17  * Author:  Andrew Christian
18  *          28 May 2002
19  */
20 #include <linux/moduleparam.h>
21 #include <linux/module.h>
22 #include <linux/init.h>
23
24 #include <linux/kernel.h>
25 #include <linux/fs.h>
26 #include <linux/slab.h>
27 #include <linux/errno.h>
28 #include <linux/hdreg.h>
29 #include <linux/kdev_t.h>
30 #include <linux/blkdev.h>
31 #include <linux/mutex.h>
32 #include <linux/scatterlist.h>
33 #include <linux/string_helpers.h>
34 #include <linux/delay.h>
35 #include <linux/capability.h>
36 #include <linux/compat.h>
37
38 #include <linux/mmc/ioctl.h>
39 #include <linux/mmc/card.h>
40 #include <linux/mmc/host.h>
41 #include <linux/mmc/mmc.h>
42 #include <linux/mmc/sd.h>
43
44 #include <asm/uaccess.h>
45
46 #include "queue.h"
47
48 MODULE_ALIAS("mmc:block");
49 #ifdef MODULE_PARAM_PREFIX
50 #undef MODULE_PARAM_PREFIX
51 #endif
52 #define MODULE_PARAM_PREFIX "mmcblk."
53
54 #define INAND_CMD38_ARG_EXT_CSD  113
55 #define INAND_CMD38_ARG_ERASE    0x00
56 #define INAND_CMD38_ARG_TRIM     0x01
57 #define INAND_CMD38_ARG_SECERASE 0x80
58 #define INAND_CMD38_ARG_SECTRIM1 0x81
59 #define INAND_CMD38_ARG_SECTRIM2 0x88
60 #define MMC_BLK_TIMEOUT_MS  (10 * 60 * 1000)        /* 10 minute timeout */
61
62 #define mmc_req_rel_wr(req)     (((req->cmd_flags & REQ_FUA) || \
63                                   (req->cmd_flags & REQ_META)) && \
64                                   (rq_data_dir(req) == WRITE))
65 #define PACKED_CMD_VER  0x01
66 #define PACKED_CMD_WR   0x02
67
68 static DEFINE_MUTEX(block_mutex);
69
70 /*
71  * The defaults come from config options but can be overriden by module
72  * or bootarg options.
73  */
74 static int perdev_minors = CONFIG_MMC_BLOCK_MINORS;
75
76 /*
77  * We've only got one major, so number of mmcblk devices is
78  * limited to 256 / number of minors per device.
79  */
80 static int max_devices;
81
82 /* 256 minors, so at most 256 separate devices */
83 static DECLARE_BITMAP(dev_use, 256);
84 static DECLARE_BITMAP(name_use, 256);
85
86 /*
87  * There is one mmc_blk_data per slot.
88  */
89 struct mmc_blk_data {
90         spinlock_t      lock;
91         struct gendisk  *disk;
92         struct mmc_queue queue;
93         struct list_head part;
94
95         unsigned int    flags;
96 #define MMC_BLK_CMD23   (1 << 0)        /* Can do SET_BLOCK_COUNT for multiblock */
97 #define MMC_BLK_REL_WR  (1 << 1)        /* MMC Reliable write support */
98 #define MMC_BLK_PACKED_CMD      (1 << 2)        /* MMC packed command support */
99
100         unsigned int    usage;
101         unsigned int    read_only;
102         unsigned int    part_type;
103         unsigned int    name_idx;
104         unsigned int    reset_done;
105 #define MMC_BLK_READ            BIT(0)
106 #define MMC_BLK_WRITE           BIT(1)
107 #define MMC_BLK_DISCARD         BIT(2)
108 #define MMC_BLK_SECDISCARD      BIT(3)
109
110         /*
111          * Only set in main mmc_blk_data associated
112          * with mmc_card with mmc_set_drvdata, and keeps
113          * track of the current selected device partition.
114          */
115         unsigned int    part_curr;
116         struct device_attribute force_ro;
117         struct device_attribute power_ro_lock;
118         int     area_type;
119 };
120
121 static DEFINE_MUTEX(open_lock);
122
123 enum {
124         MMC_PACKED_NR_IDX = -1,
125         MMC_PACKED_NR_ZERO,
126         MMC_PACKED_NR_SINGLE,
127 };
128
129 module_param(perdev_minors, int, 0444);
130 MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device");
131
132 static inline int mmc_blk_part_switch(struct mmc_card *card,
133                                       struct mmc_blk_data *md);
134 static int get_card_status(struct mmc_card *card, u32 *status, int retries);
135
136 static inline void mmc_blk_clear_packed(struct mmc_queue_req *mqrq)
137 {
138         struct mmc_packed *packed = mqrq->packed;
139
140         BUG_ON(!packed);
141
142         mqrq->cmd_type = MMC_PACKED_NONE;
143         packed->nr_entries = MMC_PACKED_NR_ZERO;
144         packed->idx_failure = MMC_PACKED_NR_IDX;
145         packed->retries = 0;
146         packed->blocks = 0;
147 }
148
149 static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk)
150 {
151         struct mmc_blk_data *md;
152
153         mutex_lock(&open_lock);
154         md = disk->private_data;
155         if (md && md->usage == 0)
156                 md = NULL;
157         if (md)
158                 md->usage++;
159         mutex_unlock(&open_lock);
160
161         return md;
162 }
163
164 static inline int mmc_get_devidx(struct gendisk *disk)
165 {
166         int devmaj = MAJOR(disk_devt(disk));
167         int devidx = MINOR(disk_devt(disk)) / perdev_minors;
168
169         if (!devmaj)
170                 devidx = disk->first_minor / perdev_minors;
171         return devidx;
172 }
173
174 static void mmc_blk_put(struct mmc_blk_data *md)
175 {
176         mutex_lock(&open_lock);
177         md->usage--;
178         if (md->usage == 0) {
179                 int devidx = mmc_get_devidx(md->disk);
180                 blk_cleanup_queue(md->queue.queue);
181
182                 __clear_bit(devidx, dev_use);
183
184                 put_disk(md->disk);
185                 kfree(md);
186         }
187         mutex_unlock(&open_lock);
188 }
189
190 static ssize_t power_ro_lock_show(struct device *dev,
191                 struct device_attribute *attr, char *buf)
192 {
193         int ret;
194         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
195         struct mmc_card *card = md->queue.card;
196         int locked = 0;
197
198         if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN)
199                 locked = 2;
200         else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN)
201                 locked = 1;
202
203         ret = snprintf(buf, PAGE_SIZE, "%d\n", locked);
204
205         return ret;
206 }
207
208 static ssize_t power_ro_lock_store(struct device *dev,
209                 struct device_attribute *attr, const char *buf, size_t count)
210 {
211         int ret;
212         struct mmc_blk_data *md, *part_md;
213         struct mmc_card *card;
214         unsigned long set;
215
216         if (kstrtoul(buf, 0, &set))
217                 return -EINVAL;
218
219         if (set != 1)
220                 return count;
221
222         md = mmc_blk_get(dev_to_disk(dev));
223         card = md->queue.card;
224
225         mmc_claim_host(card->host);
226
227         ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP,
228                                 card->ext_csd.boot_ro_lock |
229                                 EXT_CSD_BOOT_WP_B_PWR_WP_EN,
230                                 card->ext_csd.part_time);
231         if (ret)
232                 pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret);
233         else
234                 card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN;
235
236         mmc_release_host(card->host);
237
238         if (!ret) {
239                 pr_info("%s: Locking boot partition ro until next power on\n",
240                         md->disk->disk_name);
241                 set_disk_ro(md->disk, 1);
242
243                 list_for_each_entry(part_md, &md->part, part)
244                         if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) {
245                                 pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name);
246                                 set_disk_ro(part_md->disk, 1);
247                         }
248         }
249
250         mmc_blk_put(md);
251         return count;
252 }
253
254 static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr,
255                              char *buf)
256 {
257         int ret;
258         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
259
260         ret = snprintf(buf, PAGE_SIZE, "%d",
261                        get_disk_ro(dev_to_disk(dev)) ^
262                        md->read_only);
263         mmc_blk_put(md);
264         return ret;
265 }
266
267 static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr,
268                               const char *buf, size_t count)
269 {
270         int ret;
271         char *end;
272         struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev));
273         unsigned long set = simple_strtoul(buf, &end, 0);
274         if (end == buf) {
275                 ret = -EINVAL;
276                 goto out;
277         }
278
279         set_disk_ro(dev_to_disk(dev), set || md->read_only);
280         ret = count;
281 out:
282         mmc_blk_put(md);
283         return ret;
284 }
285
286 static int mmc_blk_open(struct block_device *bdev, fmode_t mode)
287 {
288         struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
289         int ret = -ENXIO;
290
291         mutex_lock(&block_mutex);
292         if (md) {
293                 if (md->usage == 2)
294                         check_disk_change(bdev);
295                 ret = 0;
296
297                 if ((mode & FMODE_WRITE) && md->read_only) {
298                         mmc_blk_put(md);
299                         ret = -EROFS;
300                 }
301         }
302         mutex_unlock(&block_mutex);
303
304         return ret;
305 }
306
307 static int mmc_blk_release(struct gendisk *disk, fmode_t mode)
308 {
309         struct mmc_blk_data *md = disk->private_data;
310
311         mutex_lock(&block_mutex);
312         mmc_blk_put(md);
313         mutex_unlock(&block_mutex);
314         return 0;
315 }
316
317 static int
318 mmc_blk_getgeo(struct block_device *bdev, struct hd_geometry *geo)
319 {
320         geo->cylinders = get_capacity(bdev->bd_disk) / (4 * 16);
321         geo->heads = 4;
322         geo->sectors = 16;
323         return 0;
324 }
325
326 struct mmc_blk_ioc_data {
327         struct mmc_ioc_cmd ic;
328         unsigned char *buf;
329         u64 buf_bytes;
330 };
331
332 static struct mmc_blk_ioc_data *mmc_blk_ioctl_copy_from_user(
333         struct mmc_ioc_cmd __user *user)
334 {
335         struct mmc_blk_ioc_data *idata;
336         int err;
337
338         idata = kzalloc(sizeof(*idata), GFP_KERNEL);
339         if (!idata) {
340                 err = -ENOMEM;
341                 goto out;
342         }
343
344         if (copy_from_user(&idata->ic, user, sizeof(idata->ic))) {
345                 err = -EFAULT;
346                 goto idata_err;
347         }
348
349         idata->buf_bytes = (u64) idata->ic.blksz * idata->ic.blocks;
350         if (idata->buf_bytes > MMC_IOC_MAX_BYTES) {
351                 err = -EOVERFLOW;
352                 goto idata_err;
353         }
354
355         if (!idata->buf_bytes)
356                 return idata;
357
358         idata->buf = kzalloc(idata->buf_bytes, GFP_KERNEL);
359         if (!idata->buf) {
360                 err = -ENOMEM;
361                 goto idata_err;
362         }
363
364         if (copy_from_user(idata->buf, (void __user *)(unsigned long)
365                                         idata->ic.data_ptr, idata->buf_bytes)) {
366                 err = -EFAULT;
367                 goto copy_err;
368         }
369
370         return idata;
371
372 copy_err:
373         kfree(idata->buf);
374 idata_err:
375         kfree(idata);
376 out:
377         return ERR_PTR(err);
378 }
379
380 static int ioctl_rpmb_card_status_poll(struct mmc_card *card, u32 *status,
381                                        u32 retries_max)
382 {
383         int err;
384         u32 retry_count = 0;
385
386         if (!status || !retries_max)
387                 return -EINVAL;
388
389         do {
390                 err = get_card_status(card, status, 5);
391                 if (err)
392                         break;
393
394                 if (!R1_STATUS(*status) &&
395                                 (R1_CURRENT_STATE(*status) != R1_STATE_PRG))
396                         break; /* RPMB programming operation complete */
397
398                 /*
399                  * Rechedule to give the MMC device a chance to continue
400                  * processing the previous command without being polled too
401                  * frequently.
402                  */
403                 usleep_range(1000, 5000);
404         } while (++retry_count < retries_max);
405
406         if (retry_count == retries_max)
407                 err = -EPERM;
408
409         return err;
410 }
411
412 static int mmc_blk_ioctl_cmd(struct block_device *bdev,
413         struct mmc_ioc_cmd __user *ic_ptr)
414 {
415         struct mmc_blk_ioc_data *idata;
416         struct mmc_blk_data *md;
417         struct mmc_card *card;
418         struct mmc_command cmd = {0};
419         struct mmc_data data = {0};
420         struct mmc_request mrq = {NULL};
421         struct scatterlist sg;
422         int err;
423         int is_rpmb = false;
424         u32 status = 0;
425
426         /*
427          * The caller must have CAP_SYS_RAWIO, and must be calling this on the
428          * whole block device, not on a partition.  This prevents overspray
429          * between sibling partitions.
430          */
431         if ((!capable(CAP_SYS_RAWIO)) || (bdev != bdev->bd_contains))
432                 return -EPERM;
433
434         idata = mmc_blk_ioctl_copy_from_user(ic_ptr);
435         if (IS_ERR(idata))
436                 return PTR_ERR(idata);
437
438         md = mmc_blk_get(bdev->bd_disk);
439         if (!md) {
440                 err = -EINVAL;
441                 goto cmd_err;
442         }
443
444         if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
445                 is_rpmb = true;
446
447         card = md->queue.card;
448         if (IS_ERR(card)) {
449                 err = PTR_ERR(card);
450                 goto cmd_done;
451         }
452
453         cmd.opcode = idata->ic.opcode;
454         cmd.arg = idata->ic.arg;
455         cmd.flags = idata->ic.flags;
456
457         if (idata->buf_bytes) {
458                 data.sg = &sg;
459                 data.sg_len = 1;
460                 data.blksz = idata->ic.blksz;
461                 data.blocks = idata->ic.blocks;
462
463                 sg_init_one(data.sg, idata->buf, idata->buf_bytes);
464
465                 if (idata->ic.write_flag)
466                         data.flags = MMC_DATA_WRITE;
467                 else
468                         data.flags = MMC_DATA_READ;
469
470                 /* data.flags must already be set before doing this. */
471                 mmc_set_data_timeout(&data, card);
472
473                 /* Allow overriding the timeout_ns for empirical tuning. */
474                 if (idata->ic.data_timeout_ns)
475                         data.timeout_ns = idata->ic.data_timeout_ns;
476
477                 if ((cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
478                         /*
479                          * Pretend this is a data transfer and rely on the
480                          * host driver to compute timeout.  When all host
481                          * drivers support cmd.cmd_timeout for R1B, this
482                          * can be changed to:
483                          *
484                          *     mrq.data = NULL;
485                          *     cmd.cmd_timeout = idata->ic.cmd_timeout_ms;
486                          */
487                         data.timeout_ns = idata->ic.cmd_timeout_ms * 1000000;
488                 }
489
490                 mrq.data = &data;
491         }
492
493         mrq.cmd = &cmd;
494
495         mmc_claim_host(card->host);
496
497         err = mmc_blk_part_switch(card, md);
498         if (err)
499                 goto cmd_rel_host;
500
501         if (idata->ic.is_acmd) {
502                 err = mmc_app_cmd(card->host, card);
503                 if (err)
504                         goto cmd_rel_host;
505         }
506
507         if (is_rpmb) {
508                 err = mmc_set_blockcount(card, data.blocks,
509                         idata->ic.write_flag & (1 << 31));
510                 if (err)
511                         goto cmd_rel_host;
512         }
513
514         mmc_wait_for_req(card->host, &mrq);
515
516         if (cmd.error) {
517                 dev_err(mmc_dev(card->host), "%s: cmd error %d\n",
518                                                 __func__, cmd.error);
519                 err = cmd.error;
520                 goto cmd_rel_host;
521         }
522         if (data.error) {
523                 dev_err(mmc_dev(card->host), "%s: data error %d\n",
524                                                 __func__, data.error);
525                 err = data.error;
526                 goto cmd_rel_host;
527         }
528
529         /*
530          * According to the SD specs, some commands require a delay after
531          * issuing the command.
532          */
533         if (idata->ic.postsleep_min_us)
534                 usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
535
536         if (copy_to_user(&(ic_ptr->response), cmd.resp, sizeof(cmd.resp))) {
537                 err = -EFAULT;
538                 goto cmd_rel_host;
539         }
540
541         if (!idata->ic.write_flag) {
542                 if (copy_to_user((void __user *)(unsigned long) idata->ic.data_ptr,
543                                                 idata->buf, idata->buf_bytes)) {
544                         err = -EFAULT;
545                         goto cmd_rel_host;
546                 }
547         }
548
549         if (is_rpmb) {
550                 /*
551                  * Ensure RPMB command has completed by polling CMD13
552                  * "Send Status".
553                  */
554                 err = ioctl_rpmb_card_status_poll(card, &status, 5);
555                 if (err)
556                         dev_err(mmc_dev(card->host),
557                                         "%s: Card Status=0x%08X, error %d\n",
558                                         __func__, status, err);
559         }
560
561 cmd_rel_host:
562         mmc_release_host(card->host);
563
564 cmd_done:
565         mmc_blk_put(md);
566 cmd_err:
567         kfree(idata->buf);
568         kfree(idata);
569         return err;
570 }
571
572 static int mmc_blk_ioctl(struct block_device *bdev, fmode_t mode,
573         unsigned int cmd, unsigned long arg)
574 {
575         int ret = -EINVAL;
576         if (cmd == MMC_IOC_CMD)
577                 ret = mmc_blk_ioctl_cmd(bdev, (struct mmc_ioc_cmd __user *)arg);
578         return ret;
579 }
580
581 #ifdef CONFIG_COMPAT
582 static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode,
583         unsigned int cmd, unsigned long arg)
584 {
585         return mmc_blk_ioctl(bdev, mode, cmd, (unsigned long) compat_ptr(arg));
586 }
587 #endif
588
589 static const struct block_device_operations mmc_bdops = {
590         .open                   = mmc_blk_open,
591         .release                = mmc_blk_release,
592         .getgeo                 = mmc_blk_getgeo,
593         .owner                  = THIS_MODULE,
594         .ioctl                  = mmc_blk_ioctl,
595 #ifdef CONFIG_COMPAT
596         .compat_ioctl           = mmc_blk_compat_ioctl,
597 #endif
598 };
599
600 static inline int mmc_blk_part_switch(struct mmc_card *card,
601                                       struct mmc_blk_data *md)
602 {
603         int ret;
604         struct mmc_blk_data *main_md = mmc_get_drvdata(card);
605
606         if (main_md->part_curr == md->part_type)
607                 return 0;
608
609         if (mmc_card_mmc(card)) {
610                 u8 part_config = card->ext_csd.part_config;
611
612                 part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
613                 part_config |= md->part_type;
614
615                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
616                                  EXT_CSD_PART_CONFIG, part_config,
617                                  card->ext_csd.part_time);
618                 if (ret)
619                         return ret;
620
621                 card->ext_csd.part_config = part_config;
622         }
623
624         main_md->part_curr = md->part_type;
625         return 0;
626 }
627
628 static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
629 {
630         int err;
631         u32 result;
632         __be32 *blocks;
633
634         struct mmc_request mrq = {NULL};
635         struct mmc_command cmd = {0};
636         struct mmc_data data = {0};
637
638         struct scatterlist sg;
639
640         cmd.opcode = MMC_APP_CMD;
641         cmd.arg = card->rca << 16;
642         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_AC;
643
644         err = mmc_wait_for_cmd(card->host, &cmd, 0);
645         if (err)
646                 return (u32)-1;
647         if (!mmc_host_is_spi(card->host) && !(cmd.resp[0] & R1_APP_CMD))
648                 return (u32)-1;
649
650         memset(&cmd, 0, sizeof(struct mmc_command));
651
652         cmd.opcode = SD_APP_SEND_NUM_WR_BLKS;
653         cmd.arg = 0;
654         cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
655
656         data.blksz = 4;
657         data.blocks = 1;
658         data.flags = MMC_DATA_READ;
659         data.sg = &sg;
660         data.sg_len = 1;
661         mmc_set_data_timeout(&data, card);
662
663         mrq.cmd = &cmd;
664         mrq.data = &data;
665
666         blocks = kmalloc(4, GFP_KERNEL);
667         if (!blocks)
668                 return (u32)-1;
669
670         sg_init_one(&sg, blocks, 4);
671
672         mmc_wait_for_req(card->host, &mrq);
673
674         result = ntohl(*blocks);
675         kfree(blocks);
676
677         if (cmd.error || data.error)
678                 result = (u32)-1;
679
680         return result;
681 }
682
683 static int send_stop(struct mmc_card *card, u32 *status)
684 {
685         struct mmc_command cmd = {0};
686         int err;
687
688         cmd.opcode = MMC_STOP_TRANSMISSION;
689         cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
690         err = mmc_wait_for_cmd(card->host, &cmd, 5);
691         if (err == 0)
692                 *status = cmd.resp[0];
693         return err;
694 }
695
696 static int get_card_status(struct mmc_card *card, u32 *status, int retries)
697 {
698         struct mmc_command cmd = {0};
699         int err;
700
701         cmd.opcode = MMC_SEND_STATUS;
702         if (!mmc_host_is_spi(card->host))
703                 cmd.arg = card->rca << 16;
704         cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_AC;
705         err = mmc_wait_for_cmd(card->host, &cmd, retries);
706         if (err == 0)
707                 *status = cmd.resp[0];
708         return err;
709 }
710
711 #define ERR_NOMEDIUM    3
712 #define ERR_RETRY       2
713 #define ERR_ABORT       1
714 #define ERR_CONTINUE    0
715
716 static int mmc_blk_cmd_error(struct request *req, const char *name, int error,
717         bool status_valid, u32 status)
718 {
719         switch (error) {
720         case -EILSEQ:
721                 /* response crc error, retry the r/w cmd */
722                 pr_err("%s: %s sending %s command, card status %#x\n",
723                         req->rq_disk->disk_name, "response CRC error",
724                         name, status);
725                 return ERR_RETRY;
726
727         case -ETIMEDOUT:
728                 pr_err("%s: %s sending %s command, card status %#x\n",
729                         req->rq_disk->disk_name, "timed out", name, status);
730
731                 /* If the status cmd initially failed, retry the r/w cmd */
732                 if (!status_valid)
733                         return ERR_RETRY;
734
735                 /*
736                  * If it was a r/w cmd crc error, or illegal command
737                  * (eg, issued in wrong state) then retry - we should
738                  * have corrected the state problem above.
739                  */
740                 if (status & (R1_COM_CRC_ERROR | R1_ILLEGAL_COMMAND))
741                         return ERR_RETRY;
742
743                 /* Otherwise abort the command */
744                 return ERR_ABORT;
745
746         default:
747                 /* We don't understand the error code the driver gave us */
748                 pr_err("%s: unknown error %d sending read/write command, card status %#x\n",
749                        req->rq_disk->disk_name, error, status);
750                 return ERR_ABORT;
751         }
752 }
753
754 /*
755  * Initial r/w and stop cmd error recovery.
756  * We don't know whether the card received the r/w cmd or not, so try to
757  * restore things back to a sane state.  Essentially, we do this as follows:
758  * - Obtain card status.  If the first attempt to obtain card status fails,
759  *   the status word will reflect the failed status cmd, not the failed
760  *   r/w cmd.  If we fail to obtain card status, it suggests we can no
761  *   longer communicate with the card.
762  * - Check the card state.  If the card received the cmd but there was a
763  *   transient problem with the response, it might still be in a data transfer
764  *   mode.  Try to send it a stop command.  If this fails, we can't recover.
765  * - If the r/w cmd failed due to a response CRC error, it was probably
766  *   transient, so retry the cmd.
767  * - If the r/w cmd timed out, but we didn't get the r/w cmd status, retry.
768  * - If the r/w cmd timed out, and the r/w cmd failed due to CRC error or
769  *   illegal cmd, retry.
770  * Otherwise we don't understand what happened, so abort.
771  */
772 static int mmc_blk_cmd_recovery(struct mmc_card *card, struct request *req,
773         struct mmc_blk_request *brq, int *ecc_err)
774 {
775         bool prev_cmd_status_valid = true;
776         u32 status, stop_status = 0;
777         int err, retry;
778
779         if (mmc_card_removed(card))
780                 return ERR_NOMEDIUM;
781
782         /*
783          * Try to get card status which indicates both the card state
784          * and why there was no response.  If the first attempt fails,
785          * we can't be sure the returned status is for the r/w command.
786          */
787         for (retry = 2; retry >= 0; retry--) {
788                 err = get_card_status(card, &status, 0);
789                 if (!err)
790                         break;
791
792                 prev_cmd_status_valid = false;
793                 pr_err("%s: error %d sending status command, %sing\n",
794                        req->rq_disk->disk_name, err, retry ? "retry" : "abort");
795         }
796
797         /* We couldn't get a response from the card.  Give up. */
798         if (err) {
799                 /* Check if the card is removed */
800                 if (mmc_detect_card_removed(card->host))
801                         return ERR_NOMEDIUM;
802                 return ERR_ABORT;
803         }
804
805         /* Flag ECC errors */
806         if ((status & R1_CARD_ECC_FAILED) ||
807             (brq->stop.resp[0] & R1_CARD_ECC_FAILED) ||
808             (brq->cmd.resp[0] & R1_CARD_ECC_FAILED))
809                 *ecc_err = 1;
810
811         /*
812          * Check the current card state.  If it is in some data transfer
813          * mode, tell it to stop (and hopefully transition back to TRAN.)
814          */
815         if (R1_CURRENT_STATE(status) == R1_STATE_DATA ||
816             R1_CURRENT_STATE(status) == R1_STATE_RCV) {
817                 err = send_stop(card, &stop_status);
818                 if (err)
819                         pr_err("%s: error %d sending stop command\n",
820                                req->rq_disk->disk_name, err);
821
822                 /*
823                  * If the stop cmd also timed out, the card is probably
824                  * not present, so abort.  Other errors are bad news too.
825                  */
826                 if (err)
827                         return ERR_ABORT;
828                 if (stop_status & R1_CARD_ECC_FAILED)
829                         *ecc_err = 1;
830         }
831
832         /* Check for set block count errors */
833         if (brq->sbc.error)
834                 return mmc_blk_cmd_error(req, "SET_BLOCK_COUNT", brq->sbc.error,
835                                 prev_cmd_status_valid, status);
836
837         /* Check for r/w command errors */
838         if (brq->cmd.error)
839                 return mmc_blk_cmd_error(req, "r/w cmd", brq->cmd.error,
840                                 prev_cmd_status_valid, status);
841
842         /* Data errors */
843         if (!brq->stop.error)
844                 return ERR_CONTINUE;
845
846         /* Now for stop errors.  These aren't fatal to the transfer. */
847         pr_err("%s: error %d sending stop command, original cmd response %#x, card status %#x\n",
848                req->rq_disk->disk_name, brq->stop.error,
849                brq->cmd.resp[0], status);
850
851         /*
852          * Subsitute in our own stop status as this will give the error
853          * state which happened during the execution of the r/w command.
854          */
855         if (stop_status) {
856                 brq->stop.resp[0] = stop_status;
857                 brq->stop.error = 0;
858         }
859         return ERR_CONTINUE;
860 }
861
862 static int mmc_blk_reset(struct mmc_blk_data *md, struct mmc_host *host,
863                          int type)
864 {
865         int err;
866
867         if (md->reset_done & type)
868                 return -EEXIST;
869
870         md->reset_done |= type;
871         err = mmc_hw_reset(host);
872         /* Ensure we switch back to the correct partition */
873         if (err != -EOPNOTSUPP) {
874                 struct mmc_blk_data *main_md = mmc_get_drvdata(host->card);
875                 int part_err;
876
877                 main_md->part_curr = main_md->part_type;
878                 part_err = mmc_blk_part_switch(host->card, md);
879                 if (part_err) {
880                         /*
881                          * We have failed to get back into the correct
882                          * partition, so we need to abort the whole request.
883                          */
884                         return -ENODEV;
885                 }
886         }
887         return err;
888 }
889
890 static inline void mmc_blk_reset_success(struct mmc_blk_data *md, int type)
891 {
892         md->reset_done &= ~type;
893 }
894
895 static int mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
896 {
897         struct mmc_blk_data *md = mq->data;
898         struct mmc_card *card = md->queue.card;
899         unsigned int from, nr, arg;
900         int err = 0, type = MMC_BLK_DISCARD;
901
902         if (!mmc_can_erase(card)) {
903                 err = -EOPNOTSUPP;
904                 goto out;
905         }
906
907         from = blk_rq_pos(req);
908         nr = blk_rq_sectors(req);
909
910         if (mmc_can_discard(card))
911                 arg = MMC_DISCARD_ARG;
912         else if (mmc_can_trim(card))
913                 arg = MMC_TRIM_ARG;
914         else
915                 arg = MMC_ERASE_ARG;
916 retry:
917         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
918                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
919                                  INAND_CMD38_ARG_EXT_CSD,
920                                  arg == MMC_TRIM_ARG ?
921                                  INAND_CMD38_ARG_TRIM :
922                                  INAND_CMD38_ARG_ERASE,
923                                  0);
924                 if (err)
925                         goto out;
926         }
927         err = mmc_erase(card, from, nr, arg);
928 out:
929         if (err == -EIO && !mmc_blk_reset(md, card->host, type))
930                 goto retry;
931         if (!err)
932                 mmc_blk_reset_success(md, type);
933         blk_end_request(req, err, blk_rq_bytes(req));
934
935         return err ? 0 : 1;
936 }
937
938 static int mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,
939                                        struct request *req)
940 {
941         struct mmc_blk_data *md = mq->data;
942         struct mmc_card *card = md->queue.card;
943         unsigned int from, nr, arg, trim_arg, erase_arg;
944         int err = 0, type = MMC_BLK_SECDISCARD;
945
946         if (!(mmc_can_secure_erase_trim(card) || mmc_can_sanitize(card))) {
947                 err = -EOPNOTSUPP;
948                 goto out;
949         }
950
951         from = blk_rq_pos(req);
952         nr = blk_rq_sectors(req);
953
954         /* The sanitize operation is supported at v4.5 only */
955         if (mmc_can_sanitize(card)) {
956                 erase_arg = MMC_ERASE_ARG;
957                 trim_arg = MMC_TRIM_ARG;
958         } else {
959                 erase_arg = MMC_SECURE_ERASE_ARG;
960                 trim_arg = MMC_SECURE_TRIM1_ARG;
961         }
962
963         if (mmc_erase_group_aligned(card, from, nr))
964                 arg = erase_arg;
965         else if (mmc_can_trim(card))
966                 arg = trim_arg;
967         else {
968                 err = -EINVAL;
969                 goto out;
970         }
971 retry:
972         if (card->quirks & MMC_QUIRK_INAND_CMD38) {
973                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
974                                  INAND_CMD38_ARG_EXT_CSD,
975                                  arg == MMC_SECURE_TRIM1_ARG ?
976                                  INAND_CMD38_ARG_SECTRIM1 :
977                                  INAND_CMD38_ARG_SECERASE,
978                                  0);
979                 if (err)
980                         goto out_retry;
981         }
982
983         err = mmc_erase(card, from, nr, arg);
984         if (err == -EIO)
985                 goto out_retry;
986         if (err)
987                 goto out;
988
989         if (arg == MMC_SECURE_TRIM1_ARG) {
990                 if (card->quirks & MMC_QUIRK_INAND_CMD38) {
991                         err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
992                                          INAND_CMD38_ARG_EXT_CSD,
993                                          INAND_CMD38_ARG_SECTRIM2,
994                                          0);
995                         if (err)
996                                 goto out_retry;
997                 }
998
999                 err = mmc_erase(card, from, nr, MMC_SECURE_TRIM2_ARG);
1000                 if (err == -EIO)
1001                         goto out_retry;
1002                 if (err)
1003                         goto out;
1004         }
1005
1006         if (mmc_can_sanitize(card))
1007                 err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
1008                                  EXT_CSD_SANITIZE_START, 1, 0);
1009 out_retry:
1010         if (err && !mmc_blk_reset(md, card->host, type))
1011                 goto retry;
1012         if (!err)
1013                 mmc_blk_reset_success(md, type);
1014 out:
1015         blk_end_request(req, err, blk_rq_bytes(req));
1016
1017         return err ? 0 : 1;
1018 }
1019
1020 static int mmc_blk_issue_flush(struct mmc_queue *mq, struct request *req)
1021 {
1022         struct mmc_blk_data *md = mq->data;
1023         struct mmc_card *card = md->queue.card;
1024         int ret = 0;
1025
1026         ret = mmc_flush_cache(card);
1027         if (ret)
1028                 ret = -EIO;
1029
1030         blk_end_request_all(req, ret);
1031
1032         return ret ? 0 : 1;
1033 }
1034
1035 /*
1036  * Reformat current write as a reliable write, supporting
1037  * both legacy and the enhanced reliable write MMC cards.
1038  * In each transfer we'll handle only as much as a single
1039  * reliable write can handle, thus finish the request in
1040  * partial completions.
1041  */
1042 static inline void mmc_apply_rel_rw(struct mmc_blk_request *brq,
1043                                     struct mmc_card *card,
1044                                     struct request *req)
1045 {
1046         if (!(card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN)) {
1047                 /* Legacy mode imposes restrictions on transfers. */
1048                 if (!IS_ALIGNED(brq->cmd.arg, card->ext_csd.rel_sectors))
1049                         brq->data.blocks = 1;
1050
1051                 if (brq->data.blocks > card->ext_csd.rel_sectors)
1052                         brq->data.blocks = card->ext_csd.rel_sectors;
1053                 else if (brq->data.blocks < card->ext_csd.rel_sectors)
1054                         brq->data.blocks = 1;
1055         }
1056 }
1057
1058 #define CMD_ERRORS                                                      \
1059         (R1_OUT_OF_RANGE |      /* Command argument out of range */     \
1060          R1_ADDRESS_ERROR |     /* Misaligned address */                \
1061          R1_BLOCK_LEN_ERROR |   /* Transferred block length incorrect */\
1062          R1_WP_VIOLATION |      /* Tried to write to protected block */ \
1063          R1_CC_ERROR |          /* Card controller error */             \
1064          R1_ERROR)              /* General/unknown error */
1065
1066 static int mmc_blk_err_check(struct mmc_card *card,
1067                              struct mmc_async_req *areq)
1068 {
1069         struct mmc_queue_req *mq_mrq = container_of(areq, struct mmc_queue_req,
1070                                                     mmc_active);
1071         struct mmc_blk_request *brq = &mq_mrq->brq;
1072         struct request *req = mq_mrq->req;
1073         int ecc_err = 0;
1074
1075         /*
1076          * sbc.error indicates a problem with the set block count
1077          * command.  No data will have been transferred.
1078          *
1079          * cmd.error indicates a problem with the r/w command.  No
1080          * data will have been transferred.
1081          *
1082          * stop.error indicates a problem with the stop command.  Data
1083          * may have been transferred, or may still be transferring.
1084          */
1085         if (brq->sbc.error || brq->cmd.error || brq->stop.error ||
1086             brq->data.error) {
1087                 switch (mmc_blk_cmd_recovery(card, req, brq, &ecc_err)) {
1088                 case ERR_RETRY:
1089                         return MMC_BLK_RETRY;
1090                 case ERR_ABORT:
1091                         return MMC_BLK_ABORT;
1092                 case ERR_NOMEDIUM:
1093                         return MMC_BLK_NOMEDIUM;
1094                 case ERR_CONTINUE:
1095                         break;
1096                 }
1097         }
1098
1099         /*
1100          * Check for errors relating to the execution of the
1101          * initial command - such as address errors.  No data
1102          * has been transferred.
1103          */
1104         if (brq->cmd.resp[0] & CMD_ERRORS) {
1105                 pr_err("%s: r/w command failed, status = %#x\n",
1106                        req->rq_disk->disk_name, brq->cmd.resp[0]);
1107                 return MMC_BLK_ABORT;
1108         }
1109
1110         /*
1111          * Everything else is either success, or a data error of some
1112          * kind.  If it was a write, we may have transitioned to
1113          * program mode, which we have to wait for it to complete.
1114          */
1115         if (!mmc_host_is_spi(card->host) && rq_data_dir(req) != READ) {
1116                 u32 status;
1117                 unsigned long timeout;
1118
1119                 timeout = jiffies + msecs_to_jiffies(MMC_BLK_TIMEOUT_MS);
1120                 do {
1121                         int err = get_card_status(card, &status, 5);
1122                         if (err) {
1123                                 pr_err("%s: error %d requesting status\n",
1124                                        req->rq_disk->disk_name, err);
1125                                 return MMC_BLK_CMD_ERR;
1126                         }
1127
1128                         /* Timeout if the device never becomes ready for data
1129                          * and never leaves the program state.
1130                          */
1131                         if (time_after(jiffies, timeout)) {
1132                                 pr_err("%s: Card stuck in programming state!"\
1133                                         " %s %s\n", mmc_hostname(card->host),
1134                                         req->rq_disk->disk_name, __func__);
1135
1136                                 return MMC_BLK_CMD_ERR;
1137                         }
1138                         /*
1139                          * Some cards mishandle the status bits,
1140                          * so make sure to check both the busy
1141                          * indication and the card state.
1142                          */
1143                 } while (!(status & R1_READY_FOR_DATA) ||
1144                          (R1_CURRENT_STATE(status) == R1_STATE_PRG));
1145         }
1146
1147         if (brq->data.error) {
1148                 pr_err("%s: error %d transferring data, sector %u, nr %u, cmd response %#x, card status %#x\n",
1149                        req->rq_disk->disk_name, brq->data.error,
1150                        (unsigned)blk_rq_pos(req),
1151                        (unsigned)blk_rq_sectors(req),
1152                        brq->cmd.resp[0], brq->stop.resp[0]);
1153
1154                 if (rq_data_dir(req) == READ) {
1155                         if (ecc_err)
1156                                 return MMC_BLK_ECC_ERR;
1157                         return MMC_BLK_DATA_ERR;
1158                 } else {
1159                         return MMC_BLK_CMD_ERR;
1160                 }
1161         }
1162
1163         if (!brq->data.bytes_xfered)
1164                 return MMC_BLK_RETRY;
1165
1166         if (mmc_packed_cmd(mq_mrq->cmd_type)) {
1167                 if (unlikely(brq->data.blocks << 9 != brq->data.bytes_xfered))
1168                         return MMC_BLK_PARTIAL;
1169                 else
1170                         return MMC_BLK_SUCCESS;
1171         }
1172
1173         if (blk_rq_bytes(req) != brq->data.bytes_xfered)
1174                 return MMC_BLK_PARTIAL;
1175
1176         return MMC_BLK_SUCCESS;
1177 }
1178
1179 static int mmc_blk_packed_err_check(struct mmc_card *card,
1180                                     struct mmc_async_req *areq)
1181 {
1182         struct mmc_queue_req *mq_rq = container_of(areq, struct mmc_queue_req,
1183                         mmc_active);
1184         struct request *req = mq_rq->req;
1185         struct mmc_packed *packed = mq_rq->packed;
1186         int err, check, status;
1187         u8 *ext_csd;
1188
1189         BUG_ON(!packed);
1190
1191         packed->retries--;
1192         check = mmc_blk_err_check(card, areq);
1193         err = get_card_status(card, &status, 0);
1194         if (err) {
1195                 pr_err("%s: error %d sending status command\n",
1196                        req->rq_disk->disk_name, err);
1197                 return MMC_BLK_ABORT;
1198         }
1199
1200         if (status & R1_EXCEPTION_EVENT) {
1201                 ext_csd = kzalloc(512, GFP_KERNEL);
1202                 if (!ext_csd) {
1203                         pr_err("%s: unable to allocate buffer for ext_csd\n",
1204                                req->rq_disk->disk_name);
1205                         return -ENOMEM;
1206                 }
1207
1208                 err = mmc_send_ext_csd(card, ext_csd);
1209                 if (err) {
1210                         pr_err("%s: error %d sending ext_csd\n",
1211                                req->rq_disk->disk_name, err);
1212                         check = MMC_BLK_ABORT;
1213                         goto free;
1214                 }
1215
1216                 if ((ext_csd[EXT_CSD_EXP_EVENTS_STATUS] &
1217                      EXT_CSD_PACKED_FAILURE) &&
1218                     (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1219                      EXT_CSD_PACKED_GENERIC_ERROR)) {
1220                         if (ext_csd[EXT_CSD_PACKED_CMD_STATUS] &
1221                             EXT_CSD_PACKED_INDEXED_ERROR) {
1222                                 packed->idx_failure =
1223                                   ext_csd[EXT_CSD_PACKED_FAILURE_INDEX] - 1;
1224                                 check = MMC_BLK_PARTIAL;
1225                         }
1226                         pr_err("%s: packed cmd failed, nr %u, sectors %u, "
1227                                "failure index: %d\n",
1228                                req->rq_disk->disk_name, packed->nr_entries,
1229                                packed->blocks, packed->idx_failure);
1230                 }
1231 free:
1232                 kfree(ext_csd);
1233         }
1234
1235         return check;
1236 }
1237
1238 static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
1239                                struct mmc_card *card,
1240                                int disable_multi,
1241                                struct mmc_queue *mq)
1242 {
1243         u32 readcmd, writecmd;
1244         struct mmc_blk_request *brq = &mqrq->brq;
1245         struct request *req = mqrq->req;
1246         struct mmc_blk_data *md = mq->data;
1247         bool do_data_tag;
1248
1249         /*
1250          * Reliable writes are used to implement Forced Unit Access and
1251          * REQ_META accesses, and are supported only on MMCs.
1252          *
1253          * XXX: this really needs a good explanation of why REQ_META
1254          * is treated special.
1255          */
1256         bool do_rel_wr = ((req->cmd_flags & REQ_FUA) ||
1257                           (req->cmd_flags & REQ_META)) &&
1258                 (rq_data_dir(req) == WRITE) &&
1259                 (md->flags & MMC_BLK_REL_WR);
1260
1261         memset(brq, 0, sizeof(struct mmc_blk_request));
1262         brq->mrq.cmd = &brq->cmd;
1263         brq->mrq.data = &brq->data;
1264
1265         brq->cmd.arg = blk_rq_pos(req);
1266         if (!mmc_card_blockaddr(card))
1267                 brq->cmd.arg <<= 9;
1268         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1269         brq->data.blksz = 512;
1270         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1271         brq->stop.arg = 0;
1272         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1273         brq->data.blocks = blk_rq_sectors(req);
1274
1275         /*
1276          * The block layer doesn't support all sector count
1277          * restrictions, so we need to be prepared for too big
1278          * requests.
1279          */
1280         if (brq->data.blocks > card->host->max_blk_count)
1281                 brq->data.blocks = card->host->max_blk_count;
1282
1283         if (brq->data.blocks > 1) {
1284                 /*
1285                  * After a read error, we redo the request one sector
1286                  * at a time in order to accurately determine which
1287                  * sectors can be read successfully.
1288                  */
1289                 if (disable_multi)
1290                         brq->data.blocks = 1;
1291
1292                 /* Some controllers can't do multiblock reads due to hw bugs */
1293                 if (card->host->caps2 & MMC_CAP2_NO_MULTI_READ &&
1294                     rq_data_dir(req) == READ)
1295                         brq->data.blocks = 1;
1296         }
1297
1298         if (brq->data.blocks > 1 || do_rel_wr) {
1299                 /* SPI multiblock writes terminate using a special
1300                  * token, not a STOP_TRANSMISSION request.
1301                  */
1302                 if (!mmc_host_is_spi(card->host) ||
1303                     rq_data_dir(req) == READ)
1304                         brq->mrq.stop = &brq->stop;
1305                 readcmd = MMC_READ_MULTIPLE_BLOCK;
1306                 writecmd = MMC_WRITE_MULTIPLE_BLOCK;
1307         } else {
1308                 brq->mrq.stop = NULL;
1309                 readcmd = MMC_READ_SINGLE_BLOCK;
1310                 writecmd = MMC_WRITE_BLOCK;
1311         }
1312         if (rq_data_dir(req) == READ) {
1313                 brq->cmd.opcode = readcmd;
1314                 brq->data.flags |= MMC_DATA_READ;
1315         } else {
1316                 brq->cmd.opcode = writecmd;
1317                 brq->data.flags |= MMC_DATA_WRITE;
1318         }
1319
1320         if (do_rel_wr)
1321                 mmc_apply_rel_rw(brq, card, req);
1322
1323         /*
1324          * Data tag is used only during writing meta data to speed
1325          * up write and any subsequent read of this meta data
1326          */
1327         do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1328                 (req->cmd_flags & REQ_META) &&
1329                 (rq_data_dir(req) == WRITE) &&
1330                 ((brq->data.blocks * brq->data.blksz) >=
1331                  card->ext_csd.data_tag_unit_size);
1332
1333         /*
1334          * Pre-defined multi-block transfers are preferable to
1335          * open ended-ones (and necessary for reliable writes).
1336          * However, it is not sufficient to just send CMD23,
1337          * and avoid the final CMD12, as on an error condition
1338          * CMD12 (stop) needs to be sent anyway. This, coupled
1339          * with Auto-CMD23 enhancements provided by some
1340          * hosts, means that the complexity of dealing
1341          * with this is best left to the host. If CMD23 is
1342          * supported by card and host, we'll fill sbc in and let
1343          * the host deal with handling it correctly. This means
1344          * that for hosts that don't expose MMC_CAP_CMD23, no
1345          * change of behavior will be observed.
1346          *
1347          * N.B: Some MMC cards experience perf degradation.
1348          * We'll avoid using CMD23-bounded multiblock writes for
1349          * these, while retaining features like reliable writes.
1350          */
1351         if ((md->flags & MMC_BLK_CMD23) && mmc_op_multi(brq->cmd.opcode) &&
1352             (do_rel_wr || !(card->quirks & MMC_QUIRK_BLK_NO_CMD23) ||
1353              do_data_tag)) {
1354                 brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1355                 brq->sbc.arg = brq->data.blocks |
1356                         (do_rel_wr ? (1 << 31) : 0) |
1357                         (do_data_tag ? (1 << 29) : 0);
1358                 brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1359                 brq->mrq.sbc = &brq->sbc;
1360         }
1361
1362         mmc_set_data_timeout(&brq->data, card);
1363
1364         brq->data.sg = mqrq->sg;
1365         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1366
1367         /*
1368          * Adjust the sg list so it is the same size as the
1369          * request.
1370          */
1371         if (brq->data.blocks != blk_rq_sectors(req)) {
1372                 int i, data_size = brq->data.blocks << 9;
1373                 struct scatterlist *sg;
1374
1375                 for_each_sg(brq->data.sg, sg, brq->data.sg_len, i) {
1376                         data_size -= sg->length;
1377                         if (data_size <= 0) {
1378                                 sg->length += data_size;
1379                                 i++;
1380                                 break;
1381                         }
1382                 }
1383                 brq->data.sg_len = i;
1384         }
1385
1386         mqrq->mmc_active.mrq = &brq->mrq;
1387         mqrq->mmc_active.err_check = mmc_blk_err_check;
1388
1389         mmc_queue_bounce_pre(mqrq);
1390 }
1391
1392 static inline u8 mmc_calc_packed_hdr_segs(struct request_queue *q,
1393                                           struct mmc_card *card)
1394 {
1395         unsigned int hdr_sz = mmc_large_sector(card) ? 4096 : 512;
1396         unsigned int max_seg_sz = queue_max_segment_size(q);
1397         unsigned int len, nr_segs = 0;
1398
1399         do {
1400                 len = min(hdr_sz, max_seg_sz);
1401                 hdr_sz -= len;
1402                 nr_segs++;
1403         } while (hdr_sz);
1404
1405         return nr_segs;
1406 }
1407
1408 static u8 mmc_blk_prep_packed_list(struct mmc_queue *mq, struct request *req)
1409 {
1410         struct request_queue *q = mq->queue;
1411         struct mmc_card *card = mq->card;
1412         struct request *cur = req, *next = NULL;
1413         struct mmc_blk_data *md = mq->data;
1414         struct mmc_queue_req *mqrq = mq->mqrq_cur;
1415         bool en_rel_wr = card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN;
1416         unsigned int req_sectors = 0, phys_segments = 0;
1417         unsigned int max_blk_count, max_phys_segs;
1418         bool put_back = true;
1419         u8 max_packed_rw = 0;
1420         u8 reqs = 0;
1421
1422         if (!(md->flags & MMC_BLK_PACKED_CMD))
1423                 goto no_packed;
1424
1425         if ((rq_data_dir(cur) == WRITE) &&
1426             mmc_host_packed_wr(card->host))
1427                 max_packed_rw = card->ext_csd.max_packed_writes;
1428
1429         if (max_packed_rw == 0)
1430                 goto no_packed;
1431
1432         if (mmc_req_rel_wr(cur) &&
1433             (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1434                 goto no_packed;
1435
1436         if (mmc_large_sector(card) &&
1437             !IS_ALIGNED(blk_rq_sectors(cur), 8))
1438                 goto no_packed;
1439
1440         mmc_blk_clear_packed(mqrq);
1441
1442         max_blk_count = min(card->host->max_blk_count,
1443                             card->host->max_req_size >> 9);
1444         if (unlikely(max_blk_count > 0xffff))
1445                 max_blk_count = 0xffff;
1446
1447         max_phys_segs = queue_max_segments(q);
1448         req_sectors += blk_rq_sectors(cur);
1449         phys_segments += cur->nr_phys_segments;
1450
1451         if (rq_data_dir(cur) == WRITE) {
1452                 req_sectors += mmc_large_sector(card) ? 8 : 1;
1453                 phys_segments += mmc_calc_packed_hdr_segs(q, card);
1454         }
1455
1456         do {
1457                 if (reqs >= max_packed_rw - 1) {
1458                         put_back = false;
1459                         break;
1460                 }
1461
1462                 spin_lock_irq(q->queue_lock);
1463                 next = blk_fetch_request(q);
1464                 spin_unlock_irq(q->queue_lock);
1465                 if (!next) {
1466                         put_back = false;
1467                         break;
1468                 }
1469
1470                 if (mmc_large_sector(card) &&
1471                     !IS_ALIGNED(blk_rq_sectors(next), 8))
1472                         break;
1473
1474                 if (next->cmd_flags & REQ_DISCARD ||
1475                     next->cmd_flags & REQ_FLUSH)
1476                         break;
1477
1478                 if (rq_data_dir(cur) != rq_data_dir(next))
1479                         break;
1480
1481                 if (mmc_req_rel_wr(next) &&
1482                     (md->flags & MMC_BLK_REL_WR) && !en_rel_wr)
1483                         break;
1484
1485                 req_sectors += blk_rq_sectors(next);
1486                 if (req_sectors > max_blk_count)
1487                         break;
1488
1489                 phys_segments +=  next->nr_phys_segments;
1490                 if (phys_segments > max_phys_segs)
1491                         break;
1492
1493                 list_add_tail(&next->queuelist, &mqrq->packed->list);
1494                 cur = next;
1495                 reqs++;
1496         } while (1);
1497
1498         if (put_back) {
1499                 spin_lock_irq(q->queue_lock);
1500                 blk_requeue_request(q, next);
1501                 spin_unlock_irq(q->queue_lock);
1502         }
1503
1504         if (reqs > 0) {
1505                 list_add(&req->queuelist, &mqrq->packed->list);
1506                 mqrq->packed->nr_entries = ++reqs;
1507                 mqrq->packed->retries = reqs;
1508                 return reqs;
1509         }
1510
1511 no_packed:
1512         mqrq->cmd_type = MMC_PACKED_NONE;
1513         return 0;
1514 }
1515
1516 static void mmc_blk_packed_hdr_wrq_prep(struct mmc_queue_req *mqrq,
1517                                         struct mmc_card *card,
1518                                         struct mmc_queue *mq)
1519 {
1520         struct mmc_blk_request *brq = &mqrq->brq;
1521         struct request *req = mqrq->req;
1522         struct request *prq;
1523         struct mmc_blk_data *md = mq->data;
1524         struct mmc_packed *packed = mqrq->packed;
1525         bool do_rel_wr, do_data_tag;
1526         u32 *packed_cmd_hdr;
1527         u8 hdr_blocks;
1528         u8 i = 1;
1529
1530         BUG_ON(!packed);
1531
1532         mqrq->cmd_type = MMC_PACKED_WRITE;
1533         packed->blocks = 0;
1534         packed->idx_failure = MMC_PACKED_NR_IDX;
1535
1536         packed_cmd_hdr = packed->cmd_hdr;
1537         memset(packed_cmd_hdr, 0, sizeof(packed->cmd_hdr));
1538         packed_cmd_hdr[0] = (packed->nr_entries << 16) |
1539                 (PACKED_CMD_WR << 8) | PACKED_CMD_VER;
1540         hdr_blocks = mmc_large_sector(card) ? 8 : 1;
1541
1542         /*
1543          * Argument for each entry of packed group
1544          */
1545         list_for_each_entry(prq, &packed->list, queuelist) {
1546                 do_rel_wr = mmc_req_rel_wr(prq) && (md->flags & MMC_BLK_REL_WR);
1547                 do_data_tag = (card->ext_csd.data_tag_unit_size) &&
1548                         (prq->cmd_flags & REQ_META) &&
1549                         (rq_data_dir(prq) == WRITE) &&
1550                         ((brq->data.blocks * brq->data.blksz) >=
1551                          card->ext_csd.data_tag_unit_size);
1552                 /* Argument of CMD23 */
1553                 packed_cmd_hdr[(i * 2)] =
1554                         (do_rel_wr ? MMC_CMD23_ARG_REL_WR : 0) |
1555                         (do_data_tag ? MMC_CMD23_ARG_TAG_REQ : 0) |
1556                         blk_rq_sectors(prq);
1557                 /* Argument of CMD18 or CMD25 */
1558                 packed_cmd_hdr[((i * 2)) + 1] =
1559                         mmc_card_blockaddr(card) ?
1560                         blk_rq_pos(prq) : blk_rq_pos(prq) << 9;
1561                 packed->blocks += blk_rq_sectors(prq);
1562                 i++;
1563         }
1564
1565         memset(brq, 0, sizeof(struct mmc_blk_request));
1566         brq->mrq.cmd = &brq->cmd;
1567         brq->mrq.data = &brq->data;
1568         brq->mrq.sbc = &brq->sbc;
1569         brq->mrq.stop = &brq->stop;
1570
1571         brq->sbc.opcode = MMC_SET_BLOCK_COUNT;
1572         brq->sbc.arg = MMC_CMD23_ARG_PACKED | (packed->blocks + hdr_blocks);
1573         brq->sbc.flags = MMC_RSP_R1 | MMC_CMD_AC;
1574
1575         brq->cmd.opcode = MMC_WRITE_MULTIPLE_BLOCK;
1576         brq->cmd.arg = blk_rq_pos(req);
1577         if (!mmc_card_blockaddr(card))
1578                 brq->cmd.arg <<= 9;
1579         brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
1580
1581         brq->data.blksz = 512;
1582         brq->data.blocks = packed->blocks + hdr_blocks;
1583         brq->data.flags |= MMC_DATA_WRITE;
1584
1585         brq->stop.opcode = MMC_STOP_TRANSMISSION;
1586         brq->stop.arg = 0;
1587         brq->stop.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
1588
1589         mmc_set_data_timeout(&brq->data, card);
1590
1591         brq->data.sg = mqrq->sg;
1592         brq->data.sg_len = mmc_queue_map_sg(mq, mqrq);
1593
1594         mqrq->mmc_active.mrq = &brq->mrq;
1595         mqrq->mmc_active.err_check = mmc_blk_packed_err_check;
1596
1597         mmc_queue_bounce_pre(mqrq);
1598 }
1599
1600 static int mmc_blk_cmd_err(struct mmc_blk_data *md, struct mmc_card *card,
1601                            struct mmc_blk_request *brq, struct request *req,
1602                            int ret)
1603 {
1604         struct mmc_queue_req *mq_rq;
1605         mq_rq = container_of(brq, struct mmc_queue_req, brq);
1606
1607         /*
1608          * If this is an SD card and we're writing, we can first
1609          * mark the known good sectors as ok.
1610          *
1611          * If the card is not SD, we can still ok written sectors
1612          * as reported by the controller (which might be less than
1613          * the real number of written sectors, but never more).
1614          */
1615         if (mmc_card_sd(card)) {
1616                 u32 blocks;
1617
1618                 blocks = mmc_sd_num_wr_blocks(card);
1619                 if (blocks != (u32)-1) {
1620                         ret = blk_end_request(req, 0, blocks << 9);
1621                 }
1622         } else {
1623                 if (!mmc_packed_cmd(mq_rq->cmd_type))
1624                         ret = blk_end_request(req, 0, brq->data.bytes_xfered);
1625         }
1626         return ret;
1627 }
1628
1629 static int mmc_blk_end_packed_req(struct mmc_queue_req *mq_rq)
1630 {
1631         struct request *prq;
1632         struct mmc_packed *packed = mq_rq->packed;
1633         int idx = packed->idx_failure, i = 0;
1634         int ret = 0;
1635
1636         BUG_ON(!packed);
1637
1638         while (!list_empty(&packed->list)) {
1639                 prq = list_entry_rq(packed->list.next);
1640                 if (idx == i) {
1641                         /* retry from error index */
1642                         packed->nr_entries -= idx;
1643                         mq_rq->req = prq;
1644                         ret = 1;
1645
1646                         if (packed->nr_entries == MMC_PACKED_NR_SINGLE) {
1647                                 list_del_init(&prq->queuelist);
1648                                 mmc_blk_clear_packed(mq_rq);
1649                         }
1650                         return ret;
1651                 }
1652                 list_del_init(&prq->queuelist);
1653                 blk_end_request(prq, 0, blk_rq_bytes(prq));
1654                 i++;
1655         }
1656
1657         mmc_blk_clear_packed(mq_rq);
1658         return ret;
1659 }
1660
1661 static void mmc_blk_abort_packed_req(struct mmc_queue_req *mq_rq)
1662 {
1663         struct request *prq;
1664         struct mmc_packed *packed = mq_rq->packed;
1665
1666         BUG_ON(!packed);
1667
1668         while (!list_empty(&packed->list)) {
1669                 prq = list_entry_rq(packed->list.next);
1670                 list_del_init(&prq->queuelist);
1671                 blk_end_request(prq, -EIO, blk_rq_bytes(prq));
1672         }
1673
1674         mmc_blk_clear_packed(mq_rq);
1675 }
1676
1677 static void mmc_blk_revert_packed_req(struct mmc_queue *mq,
1678                                       struct mmc_queue_req *mq_rq)
1679 {
1680         struct request *prq;
1681         struct request_queue *q = mq->queue;
1682         struct mmc_packed *packed = mq_rq->packed;
1683
1684         BUG_ON(!packed);
1685
1686         while (!list_empty(&packed->list)) {
1687                 prq = list_entry_rq(packed->list.prev);
1688                 if (prq->queuelist.prev != &packed->list) {
1689                         list_del_init(&prq->queuelist);
1690                         spin_lock_irq(q->queue_lock);
1691                         blk_requeue_request(mq->queue, prq);
1692                         spin_unlock_irq(q->queue_lock);
1693                 } else {
1694                         list_del_init(&prq->queuelist);
1695                 }
1696         }
1697
1698         mmc_blk_clear_packed(mq_rq);
1699 }
1700
1701 static int mmc_blk_issue_rw_rq(struct mmc_queue *mq, struct request *rqc)
1702 {
1703         struct mmc_blk_data *md = mq->data;
1704         struct mmc_card *card = md->queue.card;
1705         struct mmc_blk_request *brq = &mq->mqrq_cur->brq;
1706         int ret = 1, disable_multi = 0, retry = 0, type;
1707         enum mmc_blk_status status;
1708         struct mmc_queue_req *mq_rq;
1709         struct request *req = rqc;
1710         struct mmc_async_req *areq;
1711         const u8 packed_nr = 2;
1712         u8 reqs = 0;
1713
1714         if (!rqc && !mq->mqrq_prev->req)
1715                 return 0;
1716
1717         if (rqc)
1718                 reqs = mmc_blk_prep_packed_list(mq, rqc);
1719
1720         do {
1721                 if (rqc) {
1722                         /*
1723                          * When 4KB native sector is enabled, only 8 blocks
1724                          * multiple read or write is allowed
1725                          */
1726                         if ((brq->data.blocks & 0x07) &&
1727                             (card->ext_csd.data_sector_size == 4096)) {
1728                                 pr_err("%s: Transfer size is not 4KB sector size aligned\n",
1729                                         req->rq_disk->disk_name);
1730                                 mq_rq = mq->mqrq_cur;
1731                                 goto cmd_abort;
1732                         }
1733
1734                         if (reqs >= packed_nr)
1735                                 mmc_blk_packed_hdr_wrq_prep(mq->mqrq_cur,
1736                                                             card, mq);
1737                         else
1738                                 mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1739                         areq = &mq->mqrq_cur->mmc_active;
1740                 } else
1741                         areq = NULL;
1742                 areq = mmc_start_req(card->host, areq, (int *) &status);
1743                 if (!areq) {
1744                         if (status == MMC_BLK_NEW_REQUEST)
1745                                 mq->flags |= MMC_QUEUE_NEW_REQUEST;
1746                         return 0;
1747                 }
1748
1749                 mq_rq = container_of(areq, struct mmc_queue_req, mmc_active);
1750                 brq = &mq_rq->brq;
1751                 req = mq_rq->req;
1752                 type = rq_data_dir(req) == READ ? MMC_BLK_READ : MMC_BLK_WRITE;
1753                 mmc_queue_bounce_post(mq_rq);
1754
1755                 switch (status) {
1756                 case MMC_BLK_SUCCESS:
1757                 case MMC_BLK_PARTIAL:
1758                         /*
1759                          * A block was successfully transferred.
1760                          */
1761                         mmc_blk_reset_success(md, type);
1762
1763                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1764                                 ret = mmc_blk_end_packed_req(mq_rq);
1765                                 break;
1766                         } else {
1767                                 ret = blk_end_request(req, 0,
1768                                                 brq->data.bytes_xfered);
1769                         }
1770
1771                         /*
1772                          * If the blk_end_request function returns non-zero even
1773                          * though all data has been transferred and no errors
1774                          * were returned by the host controller, it's a bug.
1775                          */
1776                         if (status == MMC_BLK_SUCCESS && ret) {
1777                                 pr_err("%s BUG rq_tot %d d_xfer %d\n",
1778                                        __func__, blk_rq_bytes(req),
1779                                        brq->data.bytes_xfered);
1780                                 rqc = NULL;
1781                                 goto cmd_abort;
1782                         }
1783                         break;
1784                 case MMC_BLK_CMD_ERR:
1785                         ret = mmc_blk_cmd_err(md, card, brq, req, ret);
1786                         if (!mmc_blk_reset(md, card->host, type))
1787                                 break;
1788                         goto cmd_abort;
1789                 case MMC_BLK_RETRY:
1790                         if (retry++ < 5)
1791                                 break;
1792                         /* Fall through */
1793                 case MMC_BLK_ABORT:
1794                         if (!mmc_blk_reset(md, card->host, type))
1795                                 break;
1796                         goto cmd_abort;
1797                 case MMC_BLK_DATA_ERR: {
1798                         int err;
1799
1800                         err = mmc_blk_reset(md, card->host, type);
1801                         if (!err)
1802                                 break;
1803                         if (err == -ENODEV ||
1804                                 mmc_packed_cmd(mq_rq->cmd_type))
1805                                 goto cmd_abort;
1806                         /* Fall through */
1807                 }
1808                 case MMC_BLK_ECC_ERR:
1809                         if (brq->data.blocks > 1) {
1810                                 /* Redo read one sector at a time */
1811                                 pr_warning("%s: retrying using single block read\n",
1812                                            req->rq_disk->disk_name);
1813                                 disable_multi = 1;
1814                                 break;
1815                         }
1816                         /*
1817                          * After an error, we redo I/O one sector at a
1818                          * time, so we only reach here after trying to
1819                          * read a single sector.
1820                          */
1821                         ret = blk_end_request(req, -EIO,
1822                                                 brq->data.blksz);
1823                         if (!ret)
1824                                 goto start_new_req;
1825                         break;
1826                 case MMC_BLK_NOMEDIUM:
1827                         goto cmd_abort;
1828                 default:
1829                         pr_err("%s: Unhandled return value (%d)",
1830                                         req->rq_disk->disk_name, status);
1831                         goto cmd_abort;
1832                 }
1833
1834                 if (ret) {
1835                         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1836                                 if (!mq_rq->packed->retries)
1837                                         goto cmd_abort;
1838                                 mmc_blk_packed_hdr_wrq_prep(mq_rq, card, mq);
1839                                 mmc_start_req(card->host,
1840                                               &mq_rq->mmc_active, NULL);
1841                         } else {
1842
1843                                 /*
1844                                  * In case of a incomplete request
1845                                  * prepare it again and resend.
1846                                  */
1847                                 mmc_blk_rw_rq_prep(mq_rq, card,
1848                                                 disable_multi, mq);
1849                                 mmc_start_req(card->host,
1850                                                 &mq_rq->mmc_active, NULL);
1851                         }
1852                 }
1853         } while (ret);
1854
1855         return 1;
1856
1857  cmd_abort:
1858         if (mmc_packed_cmd(mq_rq->cmd_type)) {
1859                 mmc_blk_abort_packed_req(mq_rq);
1860         } else {
1861                 if (mmc_card_removed(card))
1862                         req->cmd_flags |= REQ_QUIET;
1863                 while (ret)
1864                         ret = blk_end_request(req, -EIO,
1865                                         blk_rq_cur_bytes(req));
1866         }
1867
1868  start_new_req:
1869         if (rqc) {
1870                 if (mmc_card_removed(card)) {
1871                         rqc->cmd_flags |= REQ_QUIET;
1872                         blk_end_request_all(rqc, -EIO);
1873                 } else {
1874                         /*
1875                          * If current request is packed, it needs to put back.
1876                          */
1877                         if (mmc_packed_cmd(mq->mqrq_cur->cmd_type))
1878                                 mmc_blk_revert_packed_req(mq, mq->mqrq_cur);
1879
1880                         mmc_blk_rw_rq_prep(mq->mqrq_cur, card, 0, mq);
1881                         mmc_start_req(card->host,
1882                                       &mq->mqrq_cur->mmc_active, NULL);
1883                 }
1884         }
1885
1886         return 0;
1887 }
1888
1889 static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
1890 {
1891         int ret;
1892         struct mmc_blk_data *md = mq->data;
1893         struct mmc_card *card = md->queue.card;
1894         struct mmc_host *host = card->host;
1895         unsigned long flags;
1896
1897         if (req && !mq->mqrq_prev->req)
1898                 /* claim host only for the first request */
1899                 mmc_claim_host(card->host);
1900
1901         ret = mmc_blk_part_switch(card, md);
1902         if (ret) {
1903                 if (req) {
1904                         blk_end_request_all(req, -EIO);
1905                 }
1906                 ret = 0;
1907                 goto out;
1908         }
1909
1910         mq->flags &= ~MMC_QUEUE_NEW_REQUEST;
1911         if (req && req->cmd_flags & REQ_DISCARD) {
1912                 /* complete ongoing async transfer before issuing discard */
1913                 if (card->host->areq)
1914                         mmc_blk_issue_rw_rq(mq, NULL);
1915                 if (req->cmd_flags & REQ_SECURE &&
1916                         !(card->quirks & MMC_QUIRK_SEC_ERASE_TRIM_BROKEN))
1917                         ret = mmc_blk_issue_secdiscard_rq(mq, req);
1918                 else
1919                         ret = mmc_blk_issue_discard_rq(mq, req);
1920         } else if (req && req->cmd_flags & REQ_FLUSH) {
1921                 /* complete ongoing async transfer before issuing flush */
1922                 if (card->host->areq)
1923                         mmc_blk_issue_rw_rq(mq, NULL);
1924                 ret = mmc_blk_issue_flush(mq, req);
1925         } else {
1926                 if (!req && host->areq) {
1927                         spin_lock_irqsave(&host->context_info.lock, flags);
1928                         host->context_info.is_waiting_last_req = true;
1929                         spin_unlock_irqrestore(&host->context_info.lock, flags);
1930                 }
1931                 ret = mmc_blk_issue_rw_rq(mq, req);
1932         }
1933
1934 out:
1935         if (!req && !(mq->flags & MMC_QUEUE_NEW_REQUEST))
1936                 /* release host only when there are no more requests */
1937                 mmc_release_host(card->host);
1938         return ret;
1939 }
1940
1941 static inline int mmc_blk_readonly(struct mmc_card *card)
1942 {
1943         return mmc_card_readonly(card) ||
1944                !(card->csd.cmdclass & CCC_BLOCK_WRITE);
1945 }
1946
1947 static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
1948                                               struct device *parent,
1949                                               sector_t size,
1950                                               bool default_ro,
1951                                               const char *subname,
1952                                               int area_type)
1953 {
1954         struct mmc_blk_data *md;
1955         int devidx, ret;
1956
1957         devidx = find_first_zero_bit(dev_use, max_devices);
1958         if (devidx >= max_devices)
1959                 return ERR_PTR(-ENOSPC);
1960         __set_bit(devidx, dev_use);
1961
1962         md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);
1963         if (!md) {
1964                 ret = -ENOMEM;
1965                 goto out;
1966         }
1967
1968         /*
1969          * !subname implies we are creating main mmc_blk_data that will be
1970          * associated with mmc_card with mmc_set_drvdata. Due to device
1971          * partitions, devidx will not coincide with a per-physical card
1972          * index anymore so we keep track of a name index.
1973          */
1974         if (!subname) {
1975                 md->name_idx = find_first_zero_bit(name_use, max_devices);
1976                 __set_bit(md->name_idx, name_use);
1977         } else
1978                 md->name_idx = ((struct mmc_blk_data *)
1979                                 dev_to_disk(parent)->private_data)->name_idx;
1980
1981         md->area_type = area_type;
1982
1983         /*
1984          * Set the read-only status based on the supported commands
1985          * and the write protect switch.
1986          */
1987         md->read_only = mmc_blk_readonly(card);
1988
1989         md->disk = alloc_disk(perdev_minors);
1990         if (md->disk == NULL) {
1991                 ret = -ENOMEM;
1992                 goto err_kfree;
1993         }
1994
1995         spin_lock_init(&md->lock);
1996         INIT_LIST_HEAD(&md->part);
1997         md->usage = 1;
1998
1999         ret = mmc_init_queue(&md->queue, card, &md->lock, subname);
2000         if (ret)
2001                 goto err_putdisk;
2002
2003         md->queue.issue_fn = mmc_blk_issue_rq;
2004         md->queue.data = md;
2005
2006         md->disk->major = MMC_BLOCK_MAJOR;
2007         md->disk->first_minor = devidx * perdev_minors;
2008         md->disk->fops = &mmc_bdops;
2009         md->disk->private_data = md;
2010         md->disk->queue = md->queue.queue;
2011         md->disk->driverfs_dev = parent;
2012         set_disk_ro(md->disk, md->read_only || default_ro);
2013         if (area_type & MMC_BLK_DATA_AREA_RPMB)
2014                 md->disk->flags |= GENHD_FL_NO_PART_SCAN;
2015
2016         /*
2017          * As discussed on lkml, GENHD_FL_REMOVABLE should:
2018          *
2019          * - be set for removable media with permanent block devices
2020          * - be unset for removable block devices with permanent media
2021          *
2022          * Since MMC block devices clearly fall under the second
2023          * case, we do not set GENHD_FL_REMOVABLE.  Userspace
2024          * should use the block device creation/destruction hotplug
2025          * messages to tell when the card is present.
2026          */
2027
2028         snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
2029                  "mmcblk%d%s", md->name_idx, subname ? subname : "");
2030
2031         if (mmc_card_mmc(card))
2032                 blk_queue_logical_block_size(md->queue.queue,
2033                                              card->ext_csd.data_sector_size);
2034         else
2035                 blk_queue_logical_block_size(md->queue.queue, 512);
2036
2037         set_capacity(md->disk, size);
2038
2039         if (mmc_host_cmd23(card->host)) {
2040                 if (mmc_card_mmc(card) ||
2041                     (mmc_card_sd(card) &&
2042                      card->scr.cmds & SD_SCR_CMD23_SUPPORT))
2043                         md->flags |= MMC_BLK_CMD23;
2044         }
2045
2046         if (mmc_card_mmc(card) &&
2047             md->flags & MMC_BLK_CMD23 &&
2048             ((card->ext_csd.rel_param & EXT_CSD_WR_REL_PARAM_EN) ||
2049              card->ext_csd.rel_sectors)) {
2050                 md->flags |= MMC_BLK_REL_WR;
2051                 blk_queue_flush(md->queue.queue, REQ_FLUSH | REQ_FUA);
2052         }
2053
2054         if (mmc_card_mmc(card) &&
2055             (area_type == MMC_BLK_DATA_AREA_MAIN) &&
2056             (md->flags & MMC_BLK_CMD23) &&
2057             card->ext_csd.packed_event_en) {
2058                 if (!mmc_packed_init(&md->queue, card))
2059                         md->flags |= MMC_BLK_PACKED_CMD;
2060         }
2061
2062         return md;
2063
2064  err_putdisk:
2065         put_disk(md->disk);
2066  err_kfree:
2067         kfree(md);
2068  out:
2069         return ERR_PTR(ret);
2070 }
2071
2072 static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card)
2073 {
2074         sector_t size;
2075         struct mmc_blk_data *md;
2076
2077         if (!mmc_card_sd(card) && mmc_card_blockaddr(card)) {
2078                 /*
2079                  * The EXT_CSD sector count is in number or 512 byte
2080                  * sectors.
2081                  */
2082                 size = card->ext_csd.sectors;
2083         } else {
2084                 /*
2085                  * The CSD capacity field is in units of read_blkbits.
2086                  * set_capacity takes units of 512 bytes.
2087                  */
2088                 size = card->csd.capacity << (card->csd.read_blkbits - 9);
2089         }
2090
2091         md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL,
2092                                         MMC_BLK_DATA_AREA_MAIN);
2093         return md;
2094 }
2095
2096 static int mmc_blk_alloc_part(struct mmc_card *card,
2097                               struct mmc_blk_data *md,
2098                               unsigned int part_type,
2099                               sector_t size,
2100                               bool default_ro,
2101                               const char *subname,
2102                               int area_type)
2103 {
2104         char cap_str[10];
2105         struct mmc_blk_data *part_md;
2106
2107         part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro,
2108                                     subname, area_type);
2109         if (IS_ERR(part_md))
2110                 return PTR_ERR(part_md);
2111         part_md->part_type = part_type;
2112         list_add(&part_md->part, &md->part);
2113
2114         string_get_size((u64)get_capacity(part_md->disk) << 9, STRING_UNITS_2,
2115                         cap_str, sizeof(cap_str));
2116         pr_info("%s: %s %s partition %u %s\n",
2117                part_md->disk->disk_name, mmc_card_id(card),
2118                mmc_card_name(card), part_md->part_type, cap_str);
2119         return 0;
2120 }
2121
2122 /* MMC Physical partitions consist of two boot partitions and
2123  * up to four general purpose partitions.
2124  * For each partition enabled in EXT_CSD a block device will be allocatedi
2125  * to provide access to the partition.
2126  */
2127
2128 static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md)
2129 {
2130         int idx, ret = 0;
2131
2132         if (!mmc_card_mmc(card))
2133                 return 0;
2134
2135         for (idx = 0; idx < card->nr_parts; idx++) {
2136                 if (card->part[idx].size) {
2137                         ret = mmc_blk_alloc_part(card, md,
2138                                 card->part[idx].part_cfg,
2139                                 card->part[idx].size >> 9,
2140                                 card->part[idx].force_ro,
2141                                 card->part[idx].name,
2142                                 card->part[idx].area_type);
2143                         if (ret)
2144                                 return ret;
2145                 }
2146         }
2147
2148         return ret;
2149 }
2150
2151 static void mmc_blk_remove_req(struct mmc_blk_data *md)
2152 {
2153         struct mmc_card *card;
2154
2155         if (md) {
2156                 card = md->queue.card;
2157                 if (md->disk->flags & GENHD_FL_UP) {
2158                         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2159                         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2160                                         card->ext_csd.boot_ro_lockable)
2161                                 device_remove_file(disk_to_dev(md->disk),
2162                                         &md->power_ro_lock);
2163
2164                         /* Stop new requests from getting into the queue */
2165                         del_gendisk(md->disk);
2166                 }
2167
2168                 /* Then flush out any already in there */
2169                 mmc_cleanup_queue(&md->queue);
2170                 if (md->flags & MMC_BLK_PACKED_CMD)
2171                         mmc_packed_clean(&md->queue);
2172                 mmc_blk_put(md);
2173         }
2174 }
2175
2176 static void mmc_blk_remove_parts(struct mmc_card *card,
2177                                  struct mmc_blk_data *md)
2178 {
2179         struct list_head *pos, *q;
2180         struct mmc_blk_data *part_md;
2181
2182         __clear_bit(md->name_idx, name_use);
2183         list_for_each_safe(pos, q, &md->part) {
2184                 part_md = list_entry(pos, struct mmc_blk_data, part);
2185                 list_del(pos);
2186                 mmc_blk_remove_req(part_md);
2187         }
2188 }
2189
2190 static int mmc_add_disk(struct mmc_blk_data *md)
2191 {
2192         int ret;
2193         struct mmc_card *card = md->queue.card;
2194
2195         add_disk(md->disk);
2196         md->force_ro.show = force_ro_show;
2197         md->force_ro.store = force_ro_store;
2198         sysfs_attr_init(&md->force_ro.attr);
2199         md->force_ro.attr.name = "force_ro";
2200         md->force_ro.attr.mode = S_IRUGO | S_IWUSR;
2201         ret = device_create_file(disk_to_dev(md->disk), &md->force_ro);
2202         if (ret)
2203                 goto force_ro_fail;
2204
2205         if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) &&
2206              card->ext_csd.boot_ro_lockable) {
2207                 umode_t mode;
2208
2209                 if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS)
2210                         mode = S_IRUGO;
2211                 else
2212                         mode = S_IRUGO | S_IWUSR;
2213
2214                 md->power_ro_lock.show = power_ro_lock_show;
2215                 md->power_ro_lock.store = power_ro_lock_store;
2216                 sysfs_attr_init(&md->power_ro_lock.attr);
2217                 md->power_ro_lock.attr.mode = mode;
2218                 md->power_ro_lock.attr.name =
2219                                         "ro_lock_until_next_power_on";
2220                 ret = device_create_file(disk_to_dev(md->disk),
2221                                 &md->power_ro_lock);
2222                 if (ret)
2223                         goto power_ro_lock_fail;
2224         }
2225         return ret;
2226
2227 power_ro_lock_fail:
2228         device_remove_file(disk_to_dev(md->disk), &md->force_ro);
2229 force_ro_fail:
2230         del_gendisk(md->disk);
2231
2232         return ret;
2233 }
2234
2235 #define CID_MANFID_SANDISK      0x2
2236 #define CID_MANFID_TOSHIBA      0x11
2237 #define CID_MANFID_MICRON       0x13
2238 #define CID_MANFID_SAMSUNG      0x15
2239
2240 static const struct mmc_fixup blk_fixups[] =
2241 {
2242         MMC_FIXUP("SEM02G", CID_MANFID_SANDISK, 0x100, add_quirk,
2243                   MMC_QUIRK_INAND_CMD38),
2244         MMC_FIXUP("SEM04G", CID_MANFID_SANDISK, 0x100, add_quirk,
2245                   MMC_QUIRK_INAND_CMD38),
2246         MMC_FIXUP("SEM08G", CID_MANFID_SANDISK, 0x100, add_quirk,
2247                   MMC_QUIRK_INAND_CMD38),
2248         MMC_FIXUP("SEM16G", CID_MANFID_SANDISK, 0x100, add_quirk,
2249                   MMC_QUIRK_INAND_CMD38),
2250         MMC_FIXUP("SEM32G", CID_MANFID_SANDISK, 0x100, add_quirk,
2251                   MMC_QUIRK_INAND_CMD38),
2252
2253         /*
2254          * Some MMC cards experience performance degradation with CMD23
2255          * instead of CMD12-bounded multiblock transfers. For now we'll
2256          * black list what's bad...
2257          * - Certain Toshiba cards.
2258          *
2259          * N.B. This doesn't affect SD cards.
2260          */
2261         MMC_FIXUP("MMC08G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2262                   MMC_QUIRK_BLK_NO_CMD23),
2263         MMC_FIXUP("MMC16G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2264                   MMC_QUIRK_BLK_NO_CMD23),
2265         MMC_FIXUP("MMC32G", CID_MANFID_TOSHIBA, CID_OEMID_ANY, add_quirk_mmc,
2266                   MMC_QUIRK_BLK_NO_CMD23),
2267
2268         /*
2269          * Some Micron MMC cards needs longer data read timeout than
2270          * indicated in CSD.
2271          */
2272         MMC_FIXUP(CID_NAME_ANY, CID_MANFID_MICRON, 0x200, add_quirk_mmc,
2273                   MMC_QUIRK_LONG_READ_TIME),
2274
2275         /*
2276          * On these Samsung MoviNAND parts, performing secure erase or
2277          * secure trim can result in unrecoverable corruption due to a
2278          * firmware bug.
2279          */
2280         MMC_FIXUP("M8G2FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2281                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2282         MMC_FIXUP("MAG4FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2283                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2284         MMC_FIXUP("MBG8FA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2285                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2286         MMC_FIXUP("MCGAFA", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2287                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2288         MMC_FIXUP("VAL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2289                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2290         MMC_FIXUP("VYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2291                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2292         MMC_FIXUP("KYL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2293                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2294         MMC_FIXUP("VZL00M", CID_MANFID_SAMSUNG, CID_OEMID_ANY, add_quirk_mmc,
2295                   MMC_QUIRK_SEC_ERASE_TRIM_BROKEN),
2296
2297         END_FIXUP
2298 };
2299
2300 static int mmc_blk_probe(struct mmc_card *card)
2301 {
2302         struct mmc_blk_data *md, *part_md;
2303         char cap_str[10];
2304
2305         /*
2306          * Check that the card supports the command class(es) we need.
2307          */
2308         if (!(card->csd.cmdclass & CCC_BLOCK_READ))
2309                 return -ENODEV;
2310
2311         md = mmc_blk_alloc(card);
2312         if (IS_ERR(md))
2313                 return PTR_ERR(md);
2314
2315         string_get_size((u64)get_capacity(md->disk) << 9, STRING_UNITS_2,
2316                         cap_str, sizeof(cap_str));
2317         pr_info("%s: %s %s %s %s\n",
2318                 md->disk->disk_name, mmc_card_id(card), mmc_card_name(card),
2319                 cap_str, md->read_only ? "(ro)" : "");
2320
2321         if (mmc_blk_alloc_parts(card, md))
2322                 goto out;
2323
2324         mmc_set_drvdata(card, md);
2325         mmc_fixup_device(card, blk_fixups);
2326
2327         if (mmc_add_disk(md))
2328                 goto out;
2329
2330         list_for_each_entry(part_md, &md->part, part) {
2331                 if (mmc_add_disk(part_md))
2332                         goto out;
2333         }
2334         return 0;
2335
2336  out:
2337         mmc_blk_remove_parts(card, md);
2338         mmc_blk_remove_req(md);
2339         return 0;
2340 }
2341
2342 static void mmc_blk_remove(struct mmc_card *card)
2343 {
2344         struct mmc_blk_data *md = mmc_get_drvdata(card);
2345
2346         mmc_blk_remove_parts(card, md);
2347         mmc_claim_host(card->host);
2348         mmc_blk_part_switch(card, md);
2349         mmc_release_host(card->host);
2350         mmc_blk_remove_req(md);
2351         mmc_set_drvdata(card, NULL);
2352 }
2353
2354 #ifdef CONFIG_PM
2355 static int mmc_blk_suspend(struct mmc_card *card)
2356 {
2357         struct mmc_blk_data *part_md;
2358         struct mmc_blk_data *md = mmc_get_drvdata(card);
2359
2360         if (md) {
2361                 mmc_queue_suspend(&md->queue);
2362                 list_for_each_entry(part_md, &md->part, part) {
2363                         mmc_queue_suspend(&part_md->queue);
2364                 }
2365         }
2366         return 0;
2367 }
2368
2369 static int mmc_blk_resume(struct mmc_card *card)
2370 {
2371         struct mmc_blk_data *part_md;
2372         struct mmc_blk_data *md = mmc_get_drvdata(card);
2373
2374         if (md) {
2375                 /*
2376                  * Resume involves the card going into idle state,
2377                  * so current partition is always the main one.
2378                  */
2379                 md->part_curr = md->part_type;
2380                 mmc_queue_resume(&md->queue);
2381                 list_for_each_entry(part_md, &md->part, part) {
2382                         mmc_queue_resume(&part_md->queue);
2383                 }
2384         }
2385         return 0;
2386 }
2387 #else
2388 #define mmc_blk_suspend NULL
2389 #define mmc_blk_resume  NULL
2390 #endif
2391
2392 static struct mmc_driver mmc_driver = {
2393         .drv            = {
2394                 .name   = "mmcblk",
2395         },
2396         .probe          = mmc_blk_probe,
2397         .remove         = mmc_blk_remove,
2398         .suspend        = mmc_blk_suspend,
2399         .resume         = mmc_blk_resume,
2400 };
2401
2402 static int __init mmc_blk_init(void)
2403 {
2404         int res;
2405
2406         if (perdev_minors != CONFIG_MMC_BLOCK_MINORS)
2407                 pr_info("mmcblk: using %d minors per device\n", perdev_minors);
2408
2409         max_devices = 256 / perdev_minors;
2410
2411         res = register_blkdev(MMC_BLOCK_MAJOR, "mmc");
2412         if (res)
2413                 goto out;
2414
2415         res = mmc_register_driver(&mmc_driver);
2416         if (res)
2417                 goto out2;
2418
2419         return 0;
2420  out2:
2421         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2422  out:
2423         return res;
2424 }
2425
2426 static void __exit mmc_blk_exit(void)
2427 {
2428         mmc_unregister_driver(&mmc_driver);
2429         unregister_blkdev(MMC_BLOCK_MAJOR, "mmc");
2430 }
2431
2432 module_init(mmc_blk_init);
2433 module_exit(mmc_blk_exit);
2434
2435 MODULE_LICENSE("GPL");
2436 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
2437