2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 * Modification history:
9 * - Drew Eckhardt <drew@colorado.edu> original
10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11 * outstanding request, and other enhancements.
12 * Support loadable low-level scsi drivers.
13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14 * eight major numbers.
15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17 * sd_init and cleanups.
18 * - Alex Davis <letmein@erols.com> Fix problem where partition info
19 * not being read in sd_open. Fix problem where removable media
20 * could be ejected after sd_open.
21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24 * Support 32k/1M disks.
26 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30 * - entering other commands: SCSI_LOG_HLQUEUE level 3
31 * Note: when the logging level is set by the user, it must be greater
32 * than the level indicated above to trigger output.
35 #include <linux/module.h>
37 #include <linux/kernel.h>
39 #include <linux/bio.h>
40 #include <linux/genhd.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <linux/async.h>
52 #include <linux/slab.h>
53 #include <linux/pm_runtime.h>
55 #include <linux/t10-pi.h>
56 #include <asm/uaccess.h>
57 #include <asm/unaligned.h>
59 #include <scsi/scsi.h>
60 #include <scsi/scsi_cmnd.h>
61 #include <scsi/scsi_dbg.h>
62 #include <scsi/scsi_device.h>
63 #include <scsi/scsi_driver.h>
64 #include <scsi/scsi_eh.h>
65 #include <scsi/scsi_host.h>
66 #include <scsi/scsi_ioctl.h>
67 #include <scsi/scsicam.h>
70 #include "scsi_priv.h"
71 #include "scsi_logging.h"
73 MODULE_AUTHOR("Eric Youngdale");
74 MODULE_DESCRIPTION("SCSI disk (sd) driver");
75 MODULE_LICENSE("GPL");
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
92 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
94 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
95 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
97 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
103 static void sd_config_discard(struct scsi_disk *, unsigned int);
104 static void sd_config_write_same(struct scsi_disk *);
105 static int sd_revalidate_disk(struct gendisk *);
106 static void sd_unlock_native_capacity(struct gendisk *disk);
107 static int sd_probe(struct device *);
108 static int sd_remove(struct device *);
109 static void sd_shutdown(struct device *);
110 static int sd_suspend_system(struct device *);
111 static int sd_suspend_runtime(struct device *);
112 static int sd_resume(struct device *);
113 static void sd_rescan(struct device *);
114 static int sd_init_command(struct scsi_cmnd *SCpnt);
115 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
116 static int sd_done(struct scsi_cmnd *);
117 static int sd_eh_action(struct scsi_cmnd *, int);
118 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
119 static void scsi_disk_release(struct device *cdev);
120 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
121 static void sd_print_result(const struct scsi_disk *, const char *, int);
123 static DEFINE_SPINLOCK(sd_index_lock);
124 static DEFINE_IDA(sd_index_ida);
126 /* This semaphore is used to mediate the 0->1 reference get in the
127 * face of object destruction (i.e. we can't allow a get on an
128 * object after last put) */
129 static DEFINE_MUTEX(sd_ref_mutex);
131 static struct kmem_cache *sd_cdb_cache;
132 static mempool_t *sd_cdb_pool;
134 static const char *sd_cache_types[] = {
135 "write through", "none", "write back",
136 "write back, no read (daft)"
139 static void sd_set_flush_flag(struct scsi_disk *sdkp)
141 bool wc = false, fua = false;
149 blk_queue_write_cache(sdkp->disk->queue, wc, fua);
153 cache_type_store(struct device *dev, struct device_attribute *attr,
154 const char *buf, size_t count)
156 int i, ct = -1, rcd, wce, sp;
157 struct scsi_disk *sdkp = to_scsi_disk(dev);
158 struct scsi_device *sdp = sdkp->device;
161 struct scsi_mode_data data;
162 struct scsi_sense_hdr sshdr;
163 static const char temp[] = "temporary ";
166 if (sdp->type != TYPE_DISK)
167 /* no cache control on RBC devices; theoretically they
168 * can do it, but there's probably so many exceptions
169 * it's not worth the risk */
172 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
173 buf += sizeof(temp) - 1;
174 sdkp->cache_override = 1;
176 sdkp->cache_override = 0;
179 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
180 len = strlen(sd_cache_types[i]);
181 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
189 rcd = ct & 0x01 ? 1 : 0;
190 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
192 if (sdkp->cache_override) {
195 sd_set_flush_flag(sdkp);
199 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
200 SD_MAX_RETRIES, &data, NULL))
202 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
203 data.block_descriptor_length);
204 buffer_data = buffer + data.header_length +
205 data.block_descriptor_length;
206 buffer_data[2] &= ~0x05;
207 buffer_data[2] |= wce << 2 | rcd;
208 sp = buffer_data[0] & 0x80 ? 1 : 0;
209 buffer_data[0] &= ~0x80;
212 * Ensure WP, DPOFUA, and RESERVED fields are cleared in
213 * received mode parameter buffer before doing MODE SELECT.
215 data.device_specific = 0;
217 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
218 SD_MAX_RETRIES, &data, &sshdr)) {
219 if (scsi_sense_valid(&sshdr))
220 sd_print_sense_hdr(sdkp, &sshdr);
223 revalidate_disk(sdkp->disk);
228 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
231 struct scsi_disk *sdkp = to_scsi_disk(dev);
232 struct scsi_device *sdp = sdkp->device;
234 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
238 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
239 const char *buf, size_t count)
241 struct scsi_disk *sdkp = to_scsi_disk(dev);
242 struct scsi_device *sdp = sdkp->device;
245 if (!capable(CAP_SYS_ADMIN))
248 if (kstrtobool(buf, &v))
251 sdp->manage_start_stop = v;
255 static DEVICE_ATTR_RW(manage_start_stop);
258 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
260 struct scsi_disk *sdkp = to_scsi_disk(dev);
262 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
266 allow_restart_store(struct device *dev, struct device_attribute *attr,
267 const char *buf, size_t count)
270 struct scsi_disk *sdkp = to_scsi_disk(dev);
271 struct scsi_device *sdp = sdkp->device;
273 if (!capable(CAP_SYS_ADMIN))
276 if (sdp->type != TYPE_DISK)
279 if (kstrtobool(buf, &v))
282 sdp->allow_restart = v;
286 static DEVICE_ATTR_RW(allow_restart);
289 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
291 struct scsi_disk *sdkp = to_scsi_disk(dev);
292 int ct = sdkp->RCD + 2*sdkp->WCE;
294 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
296 static DEVICE_ATTR_RW(cache_type);
299 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
301 struct scsi_disk *sdkp = to_scsi_disk(dev);
303 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
305 static DEVICE_ATTR_RO(FUA);
308 protection_type_show(struct device *dev, struct device_attribute *attr,
311 struct scsi_disk *sdkp = to_scsi_disk(dev);
313 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
317 protection_type_store(struct device *dev, struct device_attribute *attr,
318 const char *buf, size_t count)
320 struct scsi_disk *sdkp = to_scsi_disk(dev);
324 if (!capable(CAP_SYS_ADMIN))
327 err = kstrtouint(buf, 10, &val);
332 if (val >= 0 && val <= T10_PI_TYPE3_PROTECTION)
333 sdkp->protection_type = val;
337 static DEVICE_ATTR_RW(protection_type);
340 protection_mode_show(struct device *dev, struct device_attribute *attr,
343 struct scsi_disk *sdkp = to_scsi_disk(dev);
344 struct scsi_device *sdp = sdkp->device;
345 unsigned int dif, dix;
347 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
348 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
350 if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
356 return snprintf(buf, 20, "none\n");
358 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
360 static DEVICE_ATTR_RO(protection_mode);
363 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
365 struct scsi_disk *sdkp = to_scsi_disk(dev);
367 return snprintf(buf, 20, "%u\n", sdkp->ATO);
369 static DEVICE_ATTR_RO(app_tag_own);
372 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
375 struct scsi_disk *sdkp = to_scsi_disk(dev);
377 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
379 static DEVICE_ATTR_RO(thin_provisioning);
381 static const char *lbp_mode[] = {
382 [SD_LBP_FULL] = "full",
383 [SD_LBP_UNMAP] = "unmap",
384 [SD_LBP_WS16] = "writesame_16",
385 [SD_LBP_WS10] = "writesame_10",
386 [SD_LBP_ZERO] = "writesame_zero",
387 [SD_LBP_DISABLE] = "disabled",
391 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
394 struct scsi_disk *sdkp = to_scsi_disk(dev);
396 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
400 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
401 const char *buf, size_t count)
403 struct scsi_disk *sdkp = to_scsi_disk(dev);
404 struct scsi_device *sdp = sdkp->device;
406 if (!capable(CAP_SYS_ADMIN))
409 if (sdp->type != TYPE_DISK)
412 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
413 sd_config_discard(sdkp, SD_LBP_UNMAP);
414 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
415 sd_config_discard(sdkp, SD_LBP_WS16);
416 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
417 sd_config_discard(sdkp, SD_LBP_WS10);
418 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
419 sd_config_discard(sdkp, SD_LBP_ZERO);
420 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
421 sd_config_discard(sdkp, SD_LBP_DISABLE);
427 static DEVICE_ATTR_RW(provisioning_mode);
430 max_medium_access_timeouts_show(struct device *dev,
431 struct device_attribute *attr, char *buf)
433 struct scsi_disk *sdkp = to_scsi_disk(dev);
435 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
439 max_medium_access_timeouts_store(struct device *dev,
440 struct device_attribute *attr, const char *buf,
443 struct scsi_disk *sdkp = to_scsi_disk(dev);
446 if (!capable(CAP_SYS_ADMIN))
449 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
451 return err ? err : count;
453 static DEVICE_ATTR_RW(max_medium_access_timeouts);
456 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
459 struct scsi_disk *sdkp = to_scsi_disk(dev);
461 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
465 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
466 const char *buf, size_t count)
468 struct scsi_disk *sdkp = to_scsi_disk(dev);
469 struct scsi_device *sdp = sdkp->device;
473 if (!capable(CAP_SYS_ADMIN))
476 if (sdp->type != TYPE_DISK)
479 err = kstrtoul(buf, 10, &max);
485 sdp->no_write_same = 1;
486 else if (max <= SD_MAX_WS16_BLOCKS) {
487 sdp->no_write_same = 0;
488 sdkp->max_ws_blocks = max;
491 sd_config_write_same(sdkp);
495 static DEVICE_ATTR_RW(max_write_same_blocks);
497 static struct attribute *sd_disk_attrs[] = {
498 &dev_attr_cache_type.attr,
500 &dev_attr_allow_restart.attr,
501 &dev_attr_manage_start_stop.attr,
502 &dev_attr_protection_type.attr,
503 &dev_attr_protection_mode.attr,
504 &dev_attr_app_tag_own.attr,
505 &dev_attr_thin_provisioning.attr,
506 &dev_attr_provisioning_mode.attr,
507 &dev_attr_max_write_same_blocks.attr,
508 &dev_attr_max_medium_access_timeouts.attr,
511 ATTRIBUTE_GROUPS(sd_disk);
513 static struct class sd_disk_class = {
515 .owner = THIS_MODULE,
516 .dev_release = scsi_disk_release,
517 .dev_groups = sd_disk_groups,
520 static const struct dev_pm_ops sd_pm_ops = {
521 .suspend = sd_suspend_system,
523 .poweroff = sd_suspend_system,
524 .restore = sd_resume,
525 .runtime_suspend = sd_suspend_runtime,
526 .runtime_resume = sd_resume,
529 static struct scsi_driver sd_template = {
532 .owner = THIS_MODULE,
535 .shutdown = sd_shutdown,
539 .init_command = sd_init_command,
540 .uninit_command = sd_uninit_command,
542 .eh_action = sd_eh_action,
546 * Dummy kobj_map->probe function.
547 * The default ->probe function will call modprobe, which is
548 * pointless as this module is already loaded.
550 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
556 * Device no to disk mapping:
558 * major disc2 disc p1
559 * |............|.............|....|....| <- dev_t
562 * Inside a major, we have 16k disks, however mapped non-
563 * contiguously. The first 16 disks are for major0, the next
564 * ones with major1, ... Disk 256 is for major0 again, disk 272
566 * As we stay compatible with our numbering scheme, we can reuse
567 * the well-know SCSI majors 8, 65--71, 136--143.
569 static int sd_major(int major_idx)
573 return SCSI_DISK0_MAJOR;
575 return SCSI_DISK1_MAJOR + major_idx - 1;
577 return SCSI_DISK8_MAJOR + major_idx - 8;
580 return 0; /* shut up gcc */
584 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
586 struct scsi_disk *sdkp = NULL;
588 mutex_lock(&sd_ref_mutex);
590 if (disk->private_data) {
591 sdkp = scsi_disk(disk);
592 if (scsi_device_get(sdkp->device) == 0)
593 get_device(&sdkp->dev);
597 mutex_unlock(&sd_ref_mutex);
601 static void scsi_disk_put(struct scsi_disk *sdkp)
603 struct scsi_device *sdev = sdkp->device;
605 mutex_lock(&sd_ref_mutex);
606 put_device(&sdkp->dev);
607 scsi_device_put(sdev);
608 mutex_unlock(&sd_ref_mutex);
611 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
612 unsigned int dix, unsigned int dif)
614 struct bio *bio = scmd->request->bio;
615 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
616 unsigned int protect = 0;
618 if (dix) { /* DIX Type 0, 1, 2, 3 */
619 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
620 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
622 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
623 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
626 if (dif != T10_PI_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
627 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
629 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
630 scmd->prot_flags |= SCSI_PROT_REF_CHECK;
633 if (dif) { /* DIX/DIF Type 1, 2, 3 */
634 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
636 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
637 protect = 3 << 5; /* Disable target PI checking */
639 protect = 1 << 5; /* Enable target PI checking */
642 scsi_set_prot_op(scmd, prot_op);
643 scsi_set_prot_type(scmd, dif);
644 scmd->prot_flags &= sd_prot_flag_mask(prot_op);
649 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
651 struct request_queue *q = sdkp->disk->queue;
652 unsigned int logical_block_size = sdkp->device->sector_size;
653 unsigned int max_blocks = 0;
655 q->limits.discard_zeroes_data = 0;
658 * When LBPRZ is reported, discard alignment and granularity
659 * must be fixed to the logical block size. Otherwise the block
660 * layer will drop misaligned portions of the request which can
661 * lead to data corruption. If LBPRZ is not set, we honor the
665 q->limits.discard_alignment = 0;
666 q->limits.discard_granularity = logical_block_size;
668 q->limits.discard_alignment = sdkp->unmap_alignment *
670 q->limits.discard_granularity =
671 max(sdkp->physical_block_size,
672 sdkp->unmap_granularity * logical_block_size);
675 sdkp->provisioning_mode = mode;
680 blk_queue_max_discard_sectors(q, 0);
681 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
685 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
686 (u32)SD_MAX_WS16_BLOCKS);
690 max_blocks = min_not_zero(sdkp->max_ws_blocks,
691 (u32)SD_MAX_WS16_BLOCKS);
692 q->limits.discard_zeroes_data = sdkp->lbprz;
696 max_blocks = min_not_zero(sdkp->max_ws_blocks,
697 (u32)SD_MAX_WS10_BLOCKS);
698 q->limits.discard_zeroes_data = sdkp->lbprz;
702 max_blocks = min_not_zero(sdkp->max_ws_blocks,
703 (u32)SD_MAX_WS10_BLOCKS);
704 q->limits.discard_zeroes_data = 1;
708 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
709 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
713 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
714 * @sdp: scsi device to operate one
715 * @rq: Request to prepare
717 * Will issue either UNMAP or WRITE SAME(16) depending on preference
718 * indicated by target device.
720 static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
722 struct request *rq = cmd->request;
723 struct scsi_device *sdp = cmd->device;
724 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
725 sector_t sector = blk_rq_pos(rq);
726 unsigned int nr_sectors = blk_rq_sectors(rq);
727 unsigned int nr_bytes = blk_rq_bytes(rq);
733 sector >>= ilog2(sdp->sector_size) - 9;
734 nr_sectors >>= ilog2(sdp->sector_size) - 9;
736 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
738 return BLKPREP_DEFER;
740 switch (sdkp->provisioning_mode) {
742 buf = page_address(page);
745 cmd->cmnd[0] = UNMAP;
748 put_unaligned_be16(6 + 16, &buf[0]);
749 put_unaligned_be16(16, &buf[2]);
750 put_unaligned_be64(sector, &buf[8]);
751 put_unaligned_be32(nr_sectors, &buf[16]);
758 cmd->cmnd[0] = WRITE_SAME_16;
759 cmd->cmnd[1] = 0x8; /* UNMAP */
760 put_unaligned_be64(sector, &cmd->cmnd[2]);
761 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
763 len = sdkp->device->sector_size;
769 cmd->cmnd[0] = WRITE_SAME;
770 if (sdkp->provisioning_mode == SD_LBP_WS10)
771 cmd->cmnd[1] = 0x8; /* UNMAP */
772 put_unaligned_be32(sector, &cmd->cmnd[2]);
773 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
775 len = sdkp->device->sector_size;
779 ret = BLKPREP_INVALID;
783 rq->completion_data = page;
784 rq->timeout = SD_TIMEOUT;
786 cmd->transfersize = len;
787 cmd->allowed = SD_MAX_RETRIES;
790 * Initially __data_len is set to the amount of data that needs to be
791 * transferred to the target. This amount depends on whether WRITE SAME
792 * or UNMAP is being used. After the scatterlist has been mapped by
793 * scsi_init_io() we set __data_len to the size of the area to be
794 * discarded on disk. This allows us to report completion on the full
795 * amount of blocks described by the request.
797 blk_add_request_payload(rq, page, 0, len);
798 ret = scsi_init_io(cmd);
799 rq->__data_len = nr_bytes;
802 if (ret != BLKPREP_OK)
807 static void sd_config_write_same(struct scsi_disk *sdkp)
809 struct request_queue *q = sdkp->disk->queue;
810 unsigned int logical_block_size = sdkp->device->sector_size;
812 if (sdkp->device->no_write_same) {
813 sdkp->max_ws_blocks = 0;
817 /* Some devices can not handle block counts above 0xffff despite
818 * supporting WRITE SAME(16). Consequently we default to 64k
819 * blocks per I/O unless the device explicitly advertises a
822 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
823 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
824 (u32)SD_MAX_WS16_BLOCKS);
825 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
826 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
827 (u32)SD_MAX_WS10_BLOCKS);
829 sdkp->device->no_write_same = 1;
830 sdkp->max_ws_blocks = 0;
834 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
835 (logical_block_size >> 9));
839 * sd_setup_write_same_cmnd - write the same data to multiple blocks
840 * @cmd: command to prepare
842 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
843 * preference indicated by target device.
845 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
847 struct request *rq = cmd->request;
848 struct scsi_device *sdp = cmd->device;
849 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
850 struct bio *bio = rq->bio;
851 sector_t sector = blk_rq_pos(rq);
852 unsigned int nr_sectors = blk_rq_sectors(rq);
853 unsigned int nr_bytes = blk_rq_bytes(rq);
856 if (sdkp->device->no_write_same)
857 return BLKPREP_INVALID;
859 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
861 sector >>= ilog2(sdp->sector_size) - 9;
862 nr_sectors >>= ilog2(sdp->sector_size) - 9;
864 rq->timeout = SD_WRITE_SAME_TIMEOUT;
866 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
868 cmd->cmnd[0] = WRITE_SAME_16;
869 put_unaligned_be64(sector, &cmd->cmnd[2]);
870 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
873 cmd->cmnd[0] = WRITE_SAME;
874 put_unaligned_be32(sector, &cmd->cmnd[2]);
875 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
878 cmd->transfersize = sdp->sector_size;
879 cmd->allowed = SD_MAX_RETRIES;
882 * For WRITE_SAME the data transferred in the DATA IN buffer is
883 * different from the amount of data actually written to the target.
885 * We set up __data_len to the amount of data transferred from the
886 * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list
887 * to transfer a single sector of data first, but then reset it to
888 * the amount of data to be written right after so that the I/O path
889 * knows how much to actually write.
891 rq->__data_len = sdp->sector_size;
892 ret = scsi_init_io(cmd);
893 rq->__data_len = nr_bytes;
897 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
899 struct request *rq = cmd->request;
901 /* flush requests don't perform I/O, zero the S/G table */
902 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
904 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
906 cmd->transfersize = 0;
907 cmd->allowed = SD_MAX_RETRIES;
909 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
913 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
915 struct request *rq = SCpnt->request;
916 struct scsi_device *sdp = SCpnt->device;
917 struct gendisk *disk = rq->rq_disk;
918 struct scsi_disk *sdkp;
919 sector_t block = blk_rq_pos(rq);
921 unsigned int this_count = blk_rq_sectors(rq);
922 unsigned int dif, dix;
924 unsigned char protect;
926 ret = scsi_init_io(SCpnt);
927 if (ret != BLKPREP_OK)
930 sdkp = scsi_disk(disk);
932 /* from here on until we're complete, any goto out
933 * is used for a killable error condition */
937 scmd_printk(KERN_INFO, SCpnt,
938 "%s: block=%llu, count=%d\n",
939 __func__, (unsigned long long)block, this_count));
941 if (!sdp || !scsi_device_online(sdp) ||
942 block + blk_rq_sectors(rq) > get_capacity(disk)) {
943 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
944 "Finishing %u sectors\n",
945 blk_rq_sectors(rq)));
946 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
947 "Retry with 0x%p\n", SCpnt));
953 * quietly refuse to do anything to a changed disc until
954 * the changed bit has been reset
956 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
961 * Some SD card readers can't handle multi-sector accesses which touch
962 * the last one or two hardware sectors. Split accesses as needed.
964 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
965 (sdp->sector_size / 512);
967 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
968 if (block < threshold) {
969 /* Access up to the threshold but not beyond */
970 this_count = threshold - block;
972 /* Access only a single hardware sector */
973 this_count = sdp->sector_size / 512;
977 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
978 (unsigned long long)block));
981 * If we have a 1K hardware sectorsize, prevent access to single
982 * 512 byte sectors. In theory we could handle this - in fact
983 * the scsi cdrom driver must be able to handle this because
984 * we typically use 1K blocksizes, and cdroms typically have
985 * 2K hardware sectorsizes. Of course, things are simpler
986 * with the cdrom, since it is read-only. For performance
987 * reasons, the filesystems should be able to handle this
988 * and not force the scsi disk driver to use bounce buffers
991 if (sdp->sector_size == 1024) {
992 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
993 scmd_printk(KERN_ERR, SCpnt,
994 "Bad block number requested\n");
998 this_count = this_count >> 1;
1001 if (sdp->sector_size == 2048) {
1002 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
1003 scmd_printk(KERN_ERR, SCpnt,
1004 "Bad block number requested\n");
1008 this_count = this_count >> 2;
1011 if (sdp->sector_size == 4096) {
1012 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
1013 scmd_printk(KERN_ERR, SCpnt,
1014 "Bad block number requested\n");
1018 this_count = this_count >> 3;
1021 if (rq_data_dir(rq) == WRITE) {
1022 SCpnt->cmnd[0] = WRITE_6;
1024 if (blk_integrity_rq(rq))
1025 sd_dif_prepare(SCpnt);
1027 } else if (rq_data_dir(rq) == READ) {
1028 SCpnt->cmnd[0] = READ_6;
1030 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llu,%llx\n",
1031 req_op(rq), (unsigned long long) rq->cmd_flags);
1035 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1036 "%s %d/%u 512 byte blocks.\n",
1037 (rq_data_dir(rq) == WRITE) ?
1038 "writing" : "reading", this_count,
1039 blk_rq_sectors(rq)));
1041 dix = scsi_prot_sg_count(SCpnt);
1042 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1045 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1049 if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1050 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1052 if (unlikely(SCpnt->cmnd == NULL)) {
1053 ret = BLKPREP_DEFER;
1057 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1058 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1059 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1060 SCpnt->cmnd[7] = 0x18;
1061 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1062 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1065 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1066 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1067 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1068 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1069 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1070 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1071 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1072 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1074 /* Expected Indirect LBA */
1075 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1076 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1077 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1078 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1080 /* Transfer length */
1081 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1082 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1083 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1084 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1085 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1086 SCpnt->cmnd[0] += READ_16 - READ_6;
1087 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1088 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1089 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1090 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1091 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1092 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1093 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1094 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1095 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1096 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1097 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1098 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1099 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1100 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1101 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1102 scsi_device_protection(SCpnt->device) ||
1103 SCpnt->device->use_10_for_rw) {
1104 SCpnt->cmnd[0] += READ_10 - READ_6;
1105 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1106 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1107 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1108 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1109 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1110 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1111 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1112 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1114 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1116 * This happens only if this drive failed
1117 * 10byte rw command with ILLEGAL_REQUEST
1118 * during operation and thus turned off
1121 scmd_printk(KERN_ERR, SCpnt,
1122 "FUA write on READ/WRITE(6) drive\n");
1126 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1127 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1128 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1129 SCpnt->cmnd[4] = (unsigned char) this_count;
1132 SCpnt->sdb.length = this_count * sdp->sector_size;
1135 * We shouldn't disconnect in the middle of a sector, so with a dumb
1136 * host adapter, it's safe to assume that we can at least transfer
1137 * this many bytes between each connect / disconnect.
1139 SCpnt->transfersize = sdp->sector_size;
1140 SCpnt->underflow = this_count << 9;
1141 SCpnt->allowed = SD_MAX_RETRIES;
1144 * This indicates that the command is ready from our end to be
1152 static int sd_init_command(struct scsi_cmnd *cmd)
1154 struct request *rq = cmd->request;
1156 switch (req_op(rq)) {
1157 case REQ_OP_DISCARD:
1158 return sd_setup_discard_cmnd(cmd);
1159 case REQ_OP_WRITE_SAME:
1160 return sd_setup_write_same_cmnd(cmd);
1162 return sd_setup_flush_cmnd(cmd);
1165 return sd_setup_read_write_cmnd(cmd);
1168 return BLKPREP_KILL;
1172 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1174 struct request *rq = SCpnt->request;
1176 if (req_op(rq) == REQ_OP_DISCARD)
1177 __free_page(rq->completion_data);
1179 if (SCpnt->cmnd != rq->cmd) {
1180 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1187 * sd_open - open a scsi disk device
1188 * @inode: only i_rdev member may be used
1189 * @filp: only f_mode and f_flags may be used
1191 * Returns 0 if successful. Returns a negated errno value in case
1194 * Note: This can be called from a user context (e.g. fsck(1) )
1195 * or from within the kernel (e.g. as a result of a mount(1) ).
1196 * In the latter case @inode and @filp carry an abridged amount
1197 * of information as noted above.
1199 * Locking: called with bdev->bd_mutex held.
1201 static int sd_open(struct block_device *bdev, fmode_t mode)
1203 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1204 struct scsi_device *sdev;
1210 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1212 sdev = sdkp->device;
1215 * If the device is in error recovery, wait until it is done.
1216 * If the device is offline, then disallow any access to it.
1219 if (!scsi_block_when_processing_errors(sdev))
1222 if (sdev->removable || sdkp->write_prot)
1223 check_disk_change(bdev);
1226 * If the drive is empty, just let the open fail.
1228 retval = -ENOMEDIUM;
1229 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1233 * If the device has the write protect tab set, have the open fail
1234 * if the user expects to be able to write to the thing.
1237 if (sdkp->write_prot && (mode & FMODE_WRITE))
1241 * It is possible that the disk changing stuff resulted in
1242 * the device being taken offline. If this is the case,
1243 * report this to the user, and don't pretend that the
1244 * open actually succeeded.
1247 if (!scsi_device_online(sdev))
1250 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1251 if (scsi_block_when_processing_errors(sdev))
1252 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1258 scsi_disk_put(sdkp);
1263 * sd_release - invoked when the (last) close(2) is called on this
1265 * @inode: only i_rdev member may be used
1266 * @filp: only f_mode and f_flags may be used
1270 * Note: may block (uninterruptible) if error recovery is underway
1273 * Locking: called with bdev->bd_mutex held.
1275 static void sd_release(struct gendisk *disk, fmode_t mode)
1277 struct scsi_disk *sdkp = scsi_disk(disk);
1278 struct scsi_device *sdev = sdkp->device;
1280 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1282 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1283 if (scsi_block_when_processing_errors(sdev))
1284 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1287 scsi_disk_put(sdkp);
1290 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1292 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1293 struct scsi_device *sdp = sdkp->device;
1294 struct Scsi_Host *host = sdp->host;
1295 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1298 /* default to most commonly used values */
1299 diskinfo[0] = 0x40; /* 1 << 6 */
1300 diskinfo[1] = 0x20; /* 1 << 5 */
1301 diskinfo[2] = capacity >> 11;
1303 /* override with calculated, extended default, or driver values */
1304 if (host->hostt->bios_param)
1305 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1307 scsicam_bios_param(bdev, capacity, diskinfo);
1309 geo->heads = diskinfo[0];
1310 geo->sectors = diskinfo[1];
1311 geo->cylinders = diskinfo[2];
1316 * sd_ioctl - process an ioctl
1317 * @inode: only i_rdev/i_bdev members may be used
1318 * @filp: only f_mode and f_flags may be used
1319 * @cmd: ioctl command number
1320 * @arg: this is third argument given to ioctl(2) system call.
1321 * Often contains a pointer.
1323 * Returns 0 if successful (some ioctls return positive numbers on
1324 * success as well). Returns a negated errno value in case of error.
1326 * Note: most ioctls are forward onto the block subsystem or further
1327 * down in the scsi subsystem.
1329 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1330 unsigned int cmd, unsigned long arg)
1332 struct gendisk *disk = bdev->bd_disk;
1333 struct scsi_disk *sdkp = scsi_disk(disk);
1334 struct scsi_device *sdp = sdkp->device;
1335 void __user *p = (void __user *)arg;
1338 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1339 "cmd=0x%x\n", disk->disk_name, cmd));
1341 error = scsi_verify_blk_ioctl(bdev, cmd);
1346 * If we are in the middle of error recovery, don't let anyone
1347 * else try and use this device. Also, if error recovery fails, it
1348 * may try and take the device offline, in which case all further
1349 * access to the device is prohibited.
1351 error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1352 (mode & FMODE_NDELAY) != 0);
1357 * Send SCSI addressing ioctls directly to mid level, send other
1358 * ioctls to block level and then onto mid level if they can't be
1362 case SCSI_IOCTL_GET_IDLUN:
1363 case SCSI_IOCTL_GET_BUS_NUMBER:
1364 error = scsi_ioctl(sdp, cmd, p);
1367 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1368 if (error != -ENOTTY)
1370 error = scsi_ioctl(sdp, cmd, p);
1377 static void set_media_not_present(struct scsi_disk *sdkp)
1379 if (sdkp->media_present)
1380 sdkp->device->changed = 1;
1382 if (sdkp->device->removable) {
1383 sdkp->media_present = 0;
1388 static int media_not_present(struct scsi_disk *sdkp,
1389 struct scsi_sense_hdr *sshdr)
1391 if (!scsi_sense_valid(sshdr))
1394 /* not invoked for commands that could return deferred errors */
1395 switch (sshdr->sense_key) {
1396 case UNIT_ATTENTION:
1398 /* medium not present */
1399 if (sshdr->asc == 0x3A) {
1400 set_media_not_present(sdkp);
1408 * sd_check_events - check media events
1409 * @disk: kernel device descriptor
1410 * @clearing: disk events currently being cleared
1412 * Returns mask of DISK_EVENT_*.
1414 * Note: this function is invoked from the block subsystem.
1416 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1418 struct scsi_disk *sdkp = scsi_disk_get(disk);
1419 struct scsi_device *sdp;
1420 struct scsi_sense_hdr *sshdr = NULL;
1427 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1430 * If the device is offline, don't send any commands - just pretend as
1431 * if the command failed. If the device ever comes back online, we
1432 * can deal with it then. It is only because of unrecoverable errors
1433 * that we would ever take a device offline in the first place.
1435 if (!scsi_device_online(sdp)) {
1436 set_media_not_present(sdkp);
1441 * Using TEST_UNIT_READY enables differentiation between drive with
1442 * no cartridge loaded - NOT READY, drive with changed cartridge -
1443 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1445 * Drives that auto spin down. eg iomega jaz 1G, will be started
1446 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1447 * sd_revalidate() is called.
1451 if (scsi_block_when_processing_errors(sdp)) {
1452 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1453 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1457 /* failed to execute TUR, assume media not present */
1458 if (host_byte(retval)) {
1459 set_media_not_present(sdkp);
1463 if (media_not_present(sdkp, sshdr))
1467 * For removable scsi disk we have to recognise the presence
1468 * of a disk in the drive.
1470 if (!sdkp->media_present)
1472 sdkp->media_present = 1;
1475 * sdp->changed is set under the following conditions:
1477 * Medium present state has changed in either direction.
1478 * Device has indicated UNIT_ATTENTION.
1481 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1483 scsi_disk_put(sdkp);
1487 static int sd_sync_cache(struct scsi_disk *sdkp)
1490 struct scsi_device *sdp = sdkp->device;
1491 const int timeout = sdp->request_queue->rq_timeout
1492 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1493 struct scsi_sense_hdr sshdr;
1495 if (!scsi_device_online(sdp))
1498 for (retries = 3; retries > 0; --retries) {
1499 unsigned char cmd[10] = { 0 };
1501 cmd[0] = SYNCHRONIZE_CACHE;
1503 * Leave the rest of the command zero to indicate
1506 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1507 &sshdr, timeout, SD_MAX_RETRIES,
1514 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1516 if (driver_byte(res) & DRIVER_SENSE)
1517 sd_print_sense_hdr(sdkp, &sshdr);
1518 /* we need to evaluate the error return */
1519 if (scsi_sense_valid(&sshdr) &&
1520 (sshdr.asc == 0x3a || /* medium not present */
1521 sshdr.asc == 0x20)) /* invalid command */
1522 /* this is no error here */
1525 switch (host_byte(res)) {
1526 /* ignore errors due to racing a disconnection */
1527 case DID_BAD_TARGET:
1528 case DID_NO_CONNECT:
1530 /* signal the upper layer it might try again */
1534 case DID_SOFT_ERROR:
1543 static void sd_rescan(struct device *dev)
1545 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1547 revalidate_disk(sdkp->disk);
1551 #ifdef CONFIG_COMPAT
1553 * This gets directly called from VFS. When the ioctl
1554 * is not recognized we go back to the other translation paths.
1556 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1557 unsigned int cmd, unsigned long arg)
1559 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1562 error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1563 (mode & FMODE_NDELAY) != 0);
1568 * Let the static ioctl translation table take care of it.
1570 if (!sdev->host->hostt->compat_ioctl)
1571 return -ENOIOCTLCMD;
1572 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1576 static char sd_pr_type(enum pr_type type)
1579 case PR_WRITE_EXCLUSIVE:
1581 case PR_EXCLUSIVE_ACCESS:
1583 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1585 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1587 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1589 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1596 static int sd_pr_command(struct block_device *bdev, u8 sa,
1597 u64 key, u64 sa_key, u8 type, u8 flags)
1599 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1600 struct scsi_sense_hdr sshdr;
1602 u8 cmd[16] = { 0, };
1603 u8 data[24] = { 0, };
1605 cmd[0] = PERSISTENT_RESERVE_OUT;
1608 put_unaligned_be32(sizeof(data), &cmd[5]);
1610 put_unaligned_be64(key, &data[0]);
1611 put_unaligned_be64(sa_key, &data[8]);
1614 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1615 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1617 if ((driver_byte(result) & DRIVER_SENSE) &&
1618 (scsi_sense_valid(&sshdr))) {
1619 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1620 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1626 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1629 if (flags & ~PR_FL_IGNORE_KEY)
1631 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1632 old_key, new_key, 0,
1633 (1 << 0) /* APTPL */);
1636 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1641 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1644 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1646 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1649 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1650 enum pr_type type, bool abort)
1652 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1653 sd_pr_type(type), 0);
1656 static int sd_pr_clear(struct block_device *bdev, u64 key)
1658 return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1661 static const struct pr_ops sd_pr_ops = {
1662 .pr_register = sd_pr_register,
1663 .pr_reserve = sd_pr_reserve,
1664 .pr_release = sd_pr_release,
1665 .pr_preempt = sd_pr_preempt,
1666 .pr_clear = sd_pr_clear,
1669 static const struct block_device_operations sd_fops = {
1670 .owner = THIS_MODULE,
1672 .release = sd_release,
1674 .getgeo = sd_getgeo,
1675 #ifdef CONFIG_COMPAT
1676 .compat_ioctl = sd_compat_ioctl,
1678 .check_events = sd_check_events,
1679 .revalidate_disk = sd_revalidate_disk,
1680 .unlock_native_capacity = sd_unlock_native_capacity,
1681 .pr_ops = &sd_pr_ops,
1685 * sd_eh_action - error handling callback
1686 * @scmd: sd-issued command that has failed
1687 * @eh_disp: The recovery disposition suggested by the midlayer
1689 * This function is called by the SCSI midlayer upon completion of an
1690 * error test command (currently TEST UNIT READY). The result of sending
1691 * the eh command is passed in eh_disp. We're looking for devices that
1692 * fail medium access commands but are OK with non access commands like
1693 * test unit ready (so wrongly see the device as having a successful
1696 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1698 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1700 if (!scsi_device_online(scmd->device) ||
1701 !scsi_medium_access_command(scmd) ||
1702 host_byte(scmd->result) != DID_TIME_OUT ||
1707 * The device has timed out executing a medium access command.
1708 * However, the TEST UNIT READY command sent during error
1709 * handling completed successfully. Either the device is in the
1710 * process of recovering or has it suffered an internal failure
1711 * that prevents access to the storage medium.
1713 sdkp->medium_access_timed_out++;
1716 * If the device keeps failing read/write commands but TEST UNIT
1717 * READY always completes successfully we assume that medium
1718 * access is no longer possible and take the device offline.
1720 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1721 scmd_printk(KERN_ERR, scmd,
1722 "Medium access timeout failure. Offlining disk!\n");
1723 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1731 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1733 u64 start_lba = blk_rq_pos(scmd->request);
1734 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1735 u64 factor = scmd->device->sector_size / 512;
1739 * resid is optional but mostly filled in. When it's unused,
1740 * its value is zero, so we assume the whole buffer transferred
1742 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1743 unsigned int good_bytes;
1745 if (scmd->request->cmd_type != REQ_TYPE_FS)
1748 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1749 SCSI_SENSE_BUFFERSIZE,
1754 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1757 /* be careful ... don't want any overflows */
1758 do_div(start_lba, factor);
1759 do_div(end_lba, factor);
1761 /* The bad lba was reported incorrectly, we have no idea where
1764 if (bad_lba < start_lba || bad_lba >= end_lba)
1767 /* This computation should always be done in terms of
1768 * the resolution of the device's medium.
1770 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1771 return min(good_bytes, transferred);
1775 * sd_done - bottom half handler: called when the lower level
1776 * driver has completed (successfully or otherwise) a scsi command.
1777 * @SCpnt: mid-level's per command structure.
1779 * Note: potentially run from within an ISR. Must not block.
1781 static int sd_done(struct scsi_cmnd *SCpnt)
1783 int result = SCpnt->result;
1784 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1785 struct scsi_sense_hdr sshdr;
1786 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1787 struct request *req = SCpnt->request;
1788 int sense_valid = 0;
1789 int sense_deferred = 0;
1790 unsigned char op = SCpnt->cmnd[0];
1791 unsigned char unmap = SCpnt->cmnd[1] & 8;
1793 if (req_op(req) == REQ_OP_DISCARD || req_op(req) == REQ_OP_WRITE_SAME) {
1795 good_bytes = blk_rq_bytes(req);
1796 scsi_set_resid(SCpnt, 0);
1799 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1804 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1806 sense_deferred = scsi_sense_is_deferred(&sshdr);
1808 sdkp->medium_access_timed_out = 0;
1810 if (driver_byte(result) != DRIVER_SENSE &&
1811 (!sense_valid || sense_deferred))
1814 switch (sshdr.sense_key) {
1815 case HARDWARE_ERROR:
1817 good_bytes = sd_completed_bytes(SCpnt);
1819 case RECOVERED_ERROR:
1820 good_bytes = scsi_bufflen(SCpnt);
1823 /* This indicates a false check condition, so ignore it. An
1824 * unknown amount of data was transferred so treat it as an
1828 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1830 case ABORTED_COMMAND:
1831 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1832 good_bytes = sd_completed_bytes(SCpnt);
1834 case ILLEGAL_REQUEST:
1835 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1836 good_bytes = sd_completed_bytes(SCpnt);
1837 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1838 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1841 sd_config_discard(sdkp, SD_LBP_DISABLE);
1846 sd_config_discard(sdkp, SD_LBP_DISABLE);
1848 sdkp->device->no_write_same = 1;
1849 sd_config_write_same(sdkp);
1852 req->__data_len = blk_rq_bytes(req);
1853 req->cmd_flags |= REQ_QUIET;
1862 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1863 "sd_done: completed %d of %d bytes\n",
1864 good_bytes, scsi_bufflen(SCpnt)));
1866 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1867 sd_dif_complete(SCpnt, good_bytes);
1873 * spinup disk - called only in sd_revalidate_disk()
1876 sd_spinup_disk(struct scsi_disk *sdkp)
1878 unsigned char cmd[10];
1879 unsigned long spintime_expire = 0;
1880 int retries, spintime;
1881 unsigned int the_result;
1882 struct scsi_sense_hdr sshdr;
1883 int sense_valid = 0;
1887 /* Spin up drives, as required. Only do this at boot time */
1888 /* Spinup needs to be done for module loads too. */
1893 cmd[0] = TEST_UNIT_READY;
1894 memset((void *) &cmd[1], 0, 9);
1896 the_result = scsi_execute_req(sdkp->device, cmd,
1899 SD_MAX_RETRIES, NULL);
1902 * If the drive has indicated to us that it
1903 * doesn't have any media in it, don't bother
1904 * with any more polling.
1906 if (media_not_present(sdkp, &sshdr))
1910 sense_valid = scsi_sense_valid(&sshdr);
1912 } while (retries < 3 &&
1913 (!scsi_status_is_good(the_result) ||
1914 ((driver_byte(the_result) & DRIVER_SENSE) &&
1915 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1917 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1918 /* no sense, TUR either succeeded or failed
1919 * with a status error */
1920 if(!spintime && !scsi_status_is_good(the_result)) {
1921 sd_print_result(sdkp, "Test Unit Ready failed",
1928 * The device does not want the automatic start to be issued.
1930 if (sdkp->device->no_start_on_add)
1933 if (sense_valid && sshdr.sense_key == NOT_READY) {
1934 if (sshdr.asc == 4 && sshdr.ascq == 3)
1935 break; /* manual intervention required */
1936 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1937 break; /* standby */
1938 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1939 break; /* unavailable */
1940 if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
1941 break; /* sanitize in progress */
1943 * Issue command to spin up drive when not ready
1946 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1947 cmd[0] = START_STOP;
1948 cmd[1] = 1; /* Return immediately */
1949 memset((void *) &cmd[2], 0, 8);
1950 cmd[4] = 1; /* Start spin cycle */
1951 if (sdkp->device->start_stop_pwr_cond)
1953 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1955 SD_TIMEOUT, SD_MAX_RETRIES,
1957 spintime_expire = jiffies + 100 * HZ;
1960 /* Wait 1 second for next try */
1965 * Wait for USB flash devices with slow firmware.
1966 * Yes, this sense key/ASC combination shouldn't
1967 * occur here. It's characteristic of these devices.
1969 } else if (sense_valid &&
1970 sshdr.sense_key == UNIT_ATTENTION &&
1971 sshdr.asc == 0x28) {
1973 spintime_expire = jiffies + 5 * HZ;
1976 /* Wait 1 second for next try */
1979 /* we don't understand the sense code, so it's
1980 * probably pointless to loop */
1982 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1983 sd_print_sense_hdr(sdkp, &sshdr);
1988 } while (spintime && time_before_eq(jiffies, spintime_expire));
1991 if (scsi_status_is_good(the_result))
1994 printk("not responding...\n");
2000 * Determine whether disk supports Data Integrity Field.
2002 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2004 struct scsi_device *sdp = sdkp->device;
2008 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) {
2009 sdkp->protection_type = 0;
2013 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2015 if (type > T10_PI_TYPE3_PROTECTION)
2017 else if (scsi_host_dif_capable(sdp->host, type))
2020 if (sdkp->first_scan || type != sdkp->protection_type)
2023 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2024 " protection type %u. Disabling disk!\n",
2028 sd_printk(KERN_NOTICE, sdkp,
2029 "Enabling DIF Type %u protection\n", type);
2032 sd_printk(KERN_NOTICE, sdkp,
2033 "Disabling DIF Type %u protection\n", type);
2037 sdkp->protection_type = type;
2042 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2043 struct scsi_sense_hdr *sshdr, int sense_valid,
2046 if (driver_byte(the_result) & DRIVER_SENSE)
2047 sd_print_sense_hdr(sdkp, sshdr);
2049 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2052 * Set dirty bit for removable devices if not ready -
2053 * sometimes drives will not report this properly.
2055 if (sdp->removable &&
2056 sense_valid && sshdr->sense_key == NOT_READY)
2057 set_media_not_present(sdkp);
2060 * We used to set media_present to 0 here to indicate no media
2061 * in the drive, but some drives fail read capacity even with
2062 * media present, so we can't do that.
2064 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2068 #if RC16_LEN > SD_BUF_SIZE
2069 #error RC16_LEN must not be more than SD_BUF_SIZE
2072 #define READ_CAPACITY_RETRIES_ON_RESET 10
2075 * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
2076 * and the reported logical block size is bigger than 512 bytes. Note
2077 * that last_sector is a u64 and therefore logical_to_sectors() is not
2080 static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
2082 u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
2084 if (sizeof(sector_t) == 4 && last_sector > U32_MAX)
2090 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2091 unsigned char *buffer)
2093 unsigned char cmd[16];
2094 struct scsi_sense_hdr sshdr;
2095 int sense_valid = 0;
2097 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2098 unsigned int alignment;
2099 unsigned long long lba;
2100 unsigned sector_size;
2102 if (sdp->no_read_capacity_16)
2107 cmd[0] = SERVICE_ACTION_IN_16;
2108 cmd[1] = SAI_READ_CAPACITY_16;
2110 memset(buffer, 0, RC16_LEN);
2112 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2113 buffer, RC16_LEN, &sshdr,
2114 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2116 if (media_not_present(sdkp, &sshdr))
2120 sense_valid = scsi_sense_valid(&sshdr);
2122 sshdr.sense_key == ILLEGAL_REQUEST &&
2123 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2125 /* Invalid Command Operation Code or
2126 * Invalid Field in CDB, just retry
2127 * silently with RC10 */
2130 sshdr.sense_key == UNIT_ATTENTION &&
2131 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2132 /* Device reset might occur several times,
2133 * give it one more chance */
2134 if (--reset_retries > 0)
2139 } while (the_result && retries);
2142 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2143 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2147 sector_size = get_unaligned_be32(&buffer[8]);
2148 lba = get_unaligned_be64(&buffer[0]);
2150 if (sd_read_protection_type(sdkp, buffer) < 0) {
2155 if (!sd_addressable_capacity(lba, sector_size)) {
2156 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2157 "kernel compiled with support for large block "
2163 /* Logical blocks per physical block exponent */
2164 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2166 /* Lowest aligned logical block */
2167 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2168 blk_queue_alignment_offset(sdp->request_queue, alignment);
2169 if (alignment && sdkp->first_scan)
2170 sd_printk(KERN_NOTICE, sdkp,
2171 "physical block alignment offset: %u\n", alignment);
2173 if (buffer[14] & 0x80) { /* LBPME */
2176 if (buffer[14] & 0x40) /* LBPRZ */
2179 sd_config_discard(sdkp, SD_LBP_WS16);
2182 sdkp->capacity = lba + 1;
2186 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2187 unsigned char *buffer)
2189 unsigned char cmd[16];
2190 struct scsi_sense_hdr sshdr;
2191 int sense_valid = 0;
2193 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2195 unsigned sector_size;
2198 cmd[0] = READ_CAPACITY;
2199 memset(&cmd[1], 0, 9);
2200 memset(buffer, 0, 8);
2202 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2204 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2206 if (media_not_present(sdkp, &sshdr))
2210 sense_valid = scsi_sense_valid(&sshdr);
2212 sshdr.sense_key == UNIT_ATTENTION &&
2213 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2214 /* Device reset might occur several times,
2215 * give it one more chance */
2216 if (--reset_retries > 0)
2221 } while (the_result && retries);
2224 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2225 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2229 sector_size = get_unaligned_be32(&buffer[4]);
2230 lba = get_unaligned_be32(&buffer[0]);
2232 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2233 /* Some buggy (usb cardreader) devices return an lba of
2234 0xffffffff when the want to report a size of 0 (with
2235 which they really mean no media is present) */
2237 sdkp->physical_block_size = sector_size;
2241 if (!sd_addressable_capacity(lba, sector_size)) {
2242 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2243 "kernel compiled with support for large block "
2249 sdkp->capacity = lba + 1;
2250 sdkp->physical_block_size = sector_size;
2254 static int sd_try_rc16_first(struct scsi_device *sdp)
2256 if (sdp->host->max_cmd_len < 16)
2258 if (sdp->try_rc_10_first)
2260 if (sdp->scsi_level > SCSI_SPC_2)
2262 if (scsi_device_protection(sdp))
2268 * read disk capacity
2271 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2274 struct scsi_device *sdp = sdkp->device;
2275 sector_t old_capacity = sdkp->capacity;
2277 if (sd_try_rc16_first(sdp)) {
2278 sector_size = read_capacity_16(sdkp, sdp, buffer);
2279 if (sector_size == -EOVERFLOW)
2281 if (sector_size == -ENODEV)
2283 if (sector_size < 0)
2284 sector_size = read_capacity_10(sdkp, sdp, buffer);
2285 if (sector_size < 0)
2288 sector_size = read_capacity_10(sdkp, sdp, buffer);
2289 if (sector_size == -EOVERFLOW)
2291 if (sector_size < 0)
2293 if ((sizeof(sdkp->capacity) > 4) &&
2294 (sdkp->capacity > 0xffffffffULL)) {
2295 int old_sector_size = sector_size;
2296 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2297 "Trying to use READ CAPACITY(16).\n");
2298 sector_size = read_capacity_16(sdkp, sdp, buffer);
2299 if (sector_size < 0) {
2300 sd_printk(KERN_NOTICE, sdkp,
2301 "Using 0xffffffff as device size\n");
2302 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2303 sector_size = old_sector_size;
2309 /* Some devices are known to return the total number of blocks,
2310 * not the highest block number. Some devices have versions
2311 * which do this and others which do not. Some devices we might
2312 * suspect of doing this but we don't know for certain.
2314 * If we know the reported capacity is wrong, decrement it. If
2315 * we can only guess, then assume the number of blocks is even
2316 * (usually true but not always) and err on the side of lowering
2319 if (sdp->fix_capacity ||
2320 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2321 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2322 "from its reported value: %llu\n",
2323 (unsigned long long) sdkp->capacity);
2328 if (sector_size == 0) {
2330 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2334 if (sector_size != 512 &&
2335 sector_size != 1024 &&
2336 sector_size != 2048 &&
2337 sector_size != 4096) {
2338 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2341 * The user might want to re-format the drive with
2342 * a supported sectorsize. Once this happens, it
2343 * would be relatively trivial to set the thing up.
2344 * For this reason, we leave the thing in the table.
2348 * set a bogus sector size so the normal read/write
2349 * logic in the block layer will eventually refuse any
2350 * request on this device without tripping over power
2351 * of two sector size assumptions
2355 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2358 char cap_str_2[10], cap_str_10[10];
2360 string_get_size(sdkp->capacity, sector_size,
2361 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2362 string_get_size(sdkp->capacity, sector_size,
2363 STRING_UNITS_10, cap_str_10,
2364 sizeof(cap_str_10));
2366 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2367 sd_printk(KERN_NOTICE, sdkp,
2368 "%llu %d-byte logical blocks: (%s/%s)\n",
2369 (unsigned long long)sdkp->capacity,
2370 sector_size, cap_str_10, cap_str_2);
2372 if (sdkp->physical_block_size != sector_size)
2373 sd_printk(KERN_NOTICE, sdkp,
2374 "%u-byte physical blocks\n",
2375 sdkp->physical_block_size);
2379 if (sdkp->capacity > 0xffffffff)
2380 sdp->use_16_for_rw = 1;
2382 blk_queue_physical_block_size(sdp->request_queue,
2383 sdkp->physical_block_size);
2384 sdkp->device->sector_size = sector_size;
2387 /* called with buffer of length 512 */
2389 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2390 unsigned char *buffer, int len, struct scsi_mode_data *data,
2391 struct scsi_sense_hdr *sshdr)
2393 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2394 SD_TIMEOUT, SD_MAX_RETRIES, data,
2399 * read write protect setting, if possible - called only in sd_revalidate_disk()
2400 * called with buffer of length SD_BUF_SIZE
2403 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2406 struct scsi_device *sdp = sdkp->device;
2407 struct scsi_mode_data data;
2408 int old_wp = sdkp->write_prot;
2410 set_disk_ro(sdkp->disk, 0);
2411 if (sdp->skip_ms_page_3f) {
2412 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2416 if (sdp->use_192_bytes_for_3f) {
2417 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2420 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2421 * We have to start carefully: some devices hang if we ask
2422 * for more than is available.
2424 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2427 * Second attempt: ask for page 0 When only page 0 is
2428 * implemented, a request for page 3F may return Sense Key
2429 * 5: Illegal Request, Sense Code 24: Invalid field in
2432 if (!scsi_status_is_good(res))
2433 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2436 * Third attempt: ask 255 bytes, as we did earlier.
2438 if (!scsi_status_is_good(res))
2439 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2443 if (!scsi_status_is_good(res)) {
2444 sd_first_printk(KERN_WARNING, sdkp,
2445 "Test WP failed, assume Write Enabled\n");
2447 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2448 set_disk_ro(sdkp->disk, sdkp->write_prot);
2449 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2450 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2451 sdkp->write_prot ? "on" : "off");
2452 sd_printk(KERN_DEBUG, sdkp,
2453 "Mode Sense: %02x %02x %02x %02x\n",
2454 buffer[0], buffer[1], buffer[2], buffer[3]);
2460 * sd_read_cache_type - called only from sd_revalidate_disk()
2461 * called with buffer of length SD_BUF_SIZE
2464 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2467 struct scsi_device *sdp = sdkp->device;
2472 struct scsi_mode_data data;
2473 struct scsi_sense_hdr sshdr;
2474 int old_wce = sdkp->WCE;
2475 int old_rcd = sdkp->RCD;
2476 int old_dpofua = sdkp->DPOFUA;
2479 if (sdkp->cache_override)
2483 if (sdp->skip_ms_page_8) {
2484 if (sdp->type == TYPE_RBC)
2487 if (sdp->skip_ms_page_3f)
2490 if (sdp->use_192_bytes_for_3f)
2494 } else if (sdp->type == TYPE_RBC) {
2502 /* cautiously ask */
2503 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2506 if (!scsi_status_is_good(res))
2509 if (!data.header_length) {
2512 sd_first_printk(KERN_ERR, sdkp,
2513 "Missing header in MODE_SENSE response\n");
2516 /* that went OK, now ask for the proper length */
2520 * We're only interested in the first three bytes, actually.
2521 * But the data cache page is defined for the first 20.
2525 else if (len > SD_BUF_SIZE) {
2526 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2527 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2530 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2534 if (len > first_len)
2535 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2538 if (scsi_status_is_good(res)) {
2539 int offset = data.header_length + data.block_descriptor_length;
2541 while (offset < len) {
2542 u8 page_code = buffer[offset] & 0x3F;
2543 u8 spf = buffer[offset] & 0x40;
2545 if (page_code == 8 || page_code == 6) {
2546 /* We're interested only in the first 3 bytes.
2548 if (len - offset <= 2) {
2549 sd_first_printk(KERN_ERR, sdkp,
2550 "Incomplete mode parameter "
2554 modepage = page_code;
2558 /* Go to the next page */
2559 if (spf && len - offset > 3)
2560 offset += 4 + (buffer[offset+2] << 8) +
2562 else if (!spf && len - offset > 1)
2563 offset += 2 + buffer[offset+1];
2565 sd_first_printk(KERN_ERR, sdkp,
2567 "parameter data\n");
2573 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2577 if (modepage == 8) {
2578 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2579 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2581 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2585 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2586 if (sdp->broken_fua) {
2587 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2589 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2590 !sdkp->device->use_16_for_rw) {
2591 sd_first_printk(KERN_NOTICE, sdkp,
2592 "Uses READ/WRITE(6), disabling FUA\n");
2596 /* No cache flush allowed for write protected devices */
2597 if (sdkp->WCE && sdkp->write_prot)
2600 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2601 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2602 sd_printk(KERN_NOTICE, sdkp,
2603 "Write cache: %s, read cache: %s, %s\n",
2604 sdkp->WCE ? "enabled" : "disabled",
2605 sdkp->RCD ? "disabled" : "enabled",
2606 sdkp->DPOFUA ? "supports DPO and FUA"
2607 : "doesn't support DPO or FUA");
2613 if (scsi_sense_valid(&sshdr) &&
2614 sshdr.sense_key == ILLEGAL_REQUEST &&
2615 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2616 /* Invalid field in CDB */
2617 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2619 sd_first_printk(KERN_ERR, sdkp,
2620 "Asking for cache data failed\n");
2623 if (sdp->wce_default_on) {
2624 sd_first_printk(KERN_NOTICE, sdkp,
2625 "Assuming drive cache: write back\n");
2628 sd_first_printk(KERN_ERR, sdkp,
2629 "Assuming drive cache: write through\n");
2637 * The ATO bit indicates whether the DIF application tag is available
2638 * for use by the operating system.
2640 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2643 struct scsi_device *sdp = sdkp->device;
2644 struct scsi_mode_data data;
2645 struct scsi_sense_hdr sshdr;
2647 if (sdp->type != TYPE_DISK)
2650 if (sdkp->protection_type == 0)
2653 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2654 SD_MAX_RETRIES, &data, &sshdr);
2656 if (!scsi_status_is_good(res) || !data.header_length ||
2658 sd_first_printk(KERN_WARNING, sdkp,
2659 "getting Control mode page failed, assume no ATO\n");
2661 if (scsi_sense_valid(&sshdr))
2662 sd_print_sense_hdr(sdkp, &sshdr);
2667 offset = data.header_length + data.block_descriptor_length;
2669 if ((buffer[offset] & 0x3f) != 0x0a) {
2670 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2674 if ((buffer[offset + 5] & 0x80) == 0)
2683 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2684 * @disk: disk to query
2686 static void sd_read_block_limits(struct scsi_disk *sdkp)
2688 unsigned int sector_sz = sdkp->device->sector_size;
2689 const int vpd_len = 64;
2690 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2693 /* Block Limits VPD */
2694 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2697 blk_queue_io_min(sdkp->disk->queue,
2698 get_unaligned_be16(&buffer[6]) * sector_sz);
2700 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2701 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2703 if (buffer[3] == 0x3c) {
2704 unsigned int lba_count, desc_count;
2706 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2711 lba_count = get_unaligned_be32(&buffer[20]);
2712 desc_count = get_unaligned_be32(&buffer[24]);
2714 if (lba_count && desc_count)
2715 sdkp->max_unmap_blocks = lba_count;
2717 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2719 if (buffer[32] & 0x80)
2720 sdkp->unmap_alignment =
2721 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2723 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2725 if (sdkp->max_unmap_blocks)
2726 sd_config_discard(sdkp, SD_LBP_UNMAP);
2728 sd_config_discard(sdkp, SD_LBP_WS16);
2730 } else { /* LBP VPD page tells us what to use */
2731 if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
2732 sd_config_discard(sdkp, SD_LBP_UNMAP);
2733 else if (sdkp->lbpws)
2734 sd_config_discard(sdkp, SD_LBP_WS16);
2735 else if (sdkp->lbpws10)
2736 sd_config_discard(sdkp, SD_LBP_WS10);
2737 else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2738 sd_config_discard(sdkp, SD_LBP_UNMAP);
2740 sd_config_discard(sdkp, SD_LBP_DISABLE);
2749 * sd_read_block_characteristics - Query block dev. characteristics
2750 * @disk: disk to query
2752 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2754 unsigned char *buffer;
2756 const int vpd_len = 64;
2758 buffer = kmalloc(vpd_len, GFP_KERNEL);
2761 /* Block Device Characteristics VPD */
2762 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2765 rot = get_unaligned_be16(&buffer[4]);
2768 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2769 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue);
2777 * sd_read_block_provisioning - Query provisioning VPD page
2778 * @disk: disk to query
2780 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2782 unsigned char *buffer;
2783 const int vpd_len = 8;
2785 if (sdkp->lbpme == 0)
2788 buffer = kmalloc(vpd_len, GFP_KERNEL);
2790 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2794 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2795 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2796 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2802 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2804 struct scsi_device *sdev = sdkp->device;
2806 if (sdev->host->no_write_same) {
2807 sdev->no_write_same = 1;
2812 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2813 /* too large values might cause issues with arcmsr */
2814 int vpd_buf_len = 64;
2816 sdev->no_report_opcodes = 1;
2818 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2819 * CODES is unsupported and the device has an ATA
2820 * Information VPD page (SAT).
2822 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2823 sdev->no_write_same = 1;
2826 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2829 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2834 * Determine the device's preferred I/O size for reads and writes
2835 * unless the reported value is unreasonably small, large, not a
2836 * multiple of the physical block size, or simply garbage.
2838 static bool sd_validate_opt_xfer_size(struct scsi_disk *sdkp,
2839 unsigned int dev_max)
2841 struct scsi_device *sdp = sdkp->device;
2842 unsigned int opt_xfer_bytes =
2843 logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
2845 if (sdkp->opt_xfer_blocks == 0)
2848 if (sdkp->opt_xfer_blocks > dev_max) {
2849 sd_first_printk(KERN_WARNING, sdkp,
2850 "Optimal transfer size %u logical blocks " \
2851 "> dev_max (%u logical blocks)\n",
2852 sdkp->opt_xfer_blocks, dev_max);
2856 if (sdkp->opt_xfer_blocks > SD_DEF_XFER_BLOCKS) {
2857 sd_first_printk(KERN_WARNING, sdkp,
2858 "Optimal transfer size %u logical blocks " \
2859 "> sd driver limit (%u logical blocks)\n",
2860 sdkp->opt_xfer_blocks, SD_DEF_XFER_BLOCKS);
2864 if (opt_xfer_bytes < PAGE_SIZE) {
2865 sd_first_printk(KERN_WARNING, sdkp,
2866 "Optimal transfer size %u bytes < " \
2867 "PAGE_SIZE (%u bytes)\n",
2868 opt_xfer_bytes, (unsigned int)PAGE_SIZE);
2872 if (opt_xfer_bytes & (sdkp->physical_block_size - 1)) {
2873 sd_first_printk(KERN_WARNING, sdkp,
2874 "Optimal transfer size %u bytes not a " \
2875 "multiple of physical block size (%u bytes)\n",
2876 opt_xfer_bytes, sdkp->physical_block_size);
2880 sd_first_printk(KERN_INFO, sdkp, "Optimal transfer size %u bytes\n",
2886 * sd_revalidate_disk - called the first time a new disk is seen,
2887 * performs disk spin up, read_capacity, etc.
2888 * @disk: struct gendisk we care about
2890 static int sd_revalidate_disk(struct gendisk *disk)
2892 struct scsi_disk *sdkp = scsi_disk(disk);
2893 struct scsi_device *sdp = sdkp->device;
2894 struct request_queue *q = sdkp->disk->queue;
2895 unsigned char *buffer;
2896 unsigned int dev_max, rw_max;
2898 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2899 "sd_revalidate_disk\n"));
2902 * If the device is offline, don't try and read capacity or any
2903 * of the other niceties.
2905 if (!scsi_device_online(sdp))
2908 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2910 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2911 "allocation failure.\n");
2915 sd_spinup_disk(sdkp);
2918 * Without media there is no reason to ask; moreover, some devices
2919 * react badly if we do.
2921 if (sdkp->media_present) {
2922 sd_read_capacity(sdkp, buffer);
2924 if (scsi_device_supports_vpd(sdp)) {
2925 sd_read_block_provisioning(sdkp);
2926 sd_read_block_limits(sdkp);
2927 sd_read_block_characteristics(sdkp);
2930 sd_read_write_protect_flag(sdkp, buffer);
2931 sd_read_cache_type(sdkp, buffer);
2932 sd_read_app_tag_own(sdkp, buffer);
2933 sd_read_write_same(sdkp, buffer);
2937 * We now have all cache related info, determine how we deal
2938 * with flush requests.
2940 sd_set_flush_flag(sdkp);
2942 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2943 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
2945 /* Some devices report a maximum block count for READ/WRITE requests. */
2946 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
2947 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
2949 if (sd_validate_opt_xfer_size(sdkp, dev_max)) {
2950 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
2951 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
2953 q->limits.io_opt = 0;
2954 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
2955 (sector_t)BLK_DEF_MAX_SECTORS);
2958 /* Do not exceed controller limit */
2959 rw_max = min(rw_max, queue_max_hw_sectors(q));
2962 * Only update max_sectors if previously unset or if the current value
2963 * exceeds the capabilities of the hardware.
2965 if (sdkp->first_scan ||
2966 q->limits.max_sectors > q->limits.max_dev_sectors ||
2967 q->limits.max_sectors > q->limits.max_hw_sectors)
2968 q->limits.max_sectors = rw_max;
2970 sdkp->first_scan = 0;
2972 set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
2973 sd_config_write_same(sdkp);
2981 * sd_unlock_native_capacity - unlock native capacity
2982 * @disk: struct gendisk to set capacity for
2984 * Block layer calls this function if it detects that partitions
2985 * on @disk reach beyond the end of the device. If the SCSI host
2986 * implements ->unlock_native_capacity() method, it's invoked to
2987 * give it a chance to adjust the device capacity.
2990 * Defined by block layer. Might sleep.
2992 static void sd_unlock_native_capacity(struct gendisk *disk)
2994 struct scsi_device *sdev = scsi_disk(disk)->device;
2996 if (sdev->host->hostt->unlock_native_capacity)
2997 sdev->host->hostt->unlock_native_capacity(sdev);
3001 * sd_format_disk_name - format disk name
3002 * @prefix: name prefix - ie. "sd" for SCSI disks
3003 * @index: index of the disk to format name for
3004 * @buf: output buffer
3005 * @buflen: length of the output buffer
3007 * SCSI disk names starts at sda. The 26th device is sdz and the
3008 * 27th is sdaa. The last one for two lettered suffix is sdzz
3009 * which is followed by sdaaa.
3011 * This is basically 26 base counting with one extra 'nil' entry
3012 * at the beginning from the second digit on and can be
3013 * determined using similar method as 26 base conversion with the
3014 * index shifted -1 after each digit is computed.
3020 * 0 on success, -errno on failure.
3022 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3024 const int base = 'z' - 'a' + 1;
3025 char *begin = buf + strlen(prefix);
3026 char *end = buf + buflen;
3036 *--p = 'a' + (index % unit);
3037 index = (index / unit) - 1;
3038 } while (index >= 0);
3040 memmove(begin, p, end - p);
3041 memcpy(buf, prefix, strlen(prefix));
3047 * The asynchronous part of sd_probe
3049 static void sd_probe_async(void *data, async_cookie_t cookie)
3051 struct scsi_disk *sdkp = data;
3052 struct scsi_device *sdp;
3059 index = sdkp->index;
3060 dev = &sdp->sdev_gendev;
3062 gd->major = sd_major((index & 0xf0) >> 4);
3063 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3064 gd->minors = SD_MINORS;
3066 gd->fops = &sd_fops;
3067 gd->private_data = &sdkp->driver;
3068 gd->queue = sdkp->device->request_queue;
3070 /* defaults, until the device tells us otherwise */
3071 sdp->sector_size = 512;
3073 sdkp->media_present = 1;
3074 sdkp->write_prot = 0;
3075 sdkp->cache_override = 0;
3079 sdkp->first_scan = 1;
3080 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3082 sd_revalidate_disk(gd);
3084 gd->flags = GENHD_FL_EXT_DEVT;
3085 if (sdp->removable) {
3086 gd->flags |= GENHD_FL_REMOVABLE;
3087 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3090 blk_pm_runtime_init(sdp->request_queue, dev);
3091 device_add_disk(dev, gd);
3093 sd_dif_config_host(sdkp);
3095 sd_revalidate_disk(gd);
3097 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3098 sdp->removable ? "removable " : "");
3099 scsi_autopm_put_device(sdp);
3100 put_device(&sdkp->dev);
3104 * sd_probe - called during driver initialization and whenever a
3105 * new scsi device is attached to the system. It is called once
3106 * for each scsi device (not just disks) present.
3107 * @dev: pointer to device object
3109 * Returns 0 if successful (or not interested in this scsi device
3110 * (e.g. scanner)); 1 when there is an error.
3112 * Note: this function is invoked from the scsi mid-level.
3113 * This function sets up the mapping between a given
3114 * <host,channel,id,lun> (found in sdp) and new device name
3115 * (e.g. /dev/sda). More precisely it is the block device major
3116 * and minor number that is chosen here.
3118 * Assume sd_probe is not re-entrant (for time being)
3119 * Also think about sd_probe() and sd_remove() running coincidentally.
3121 static int sd_probe(struct device *dev)
3123 struct scsi_device *sdp = to_scsi_device(dev);
3124 struct scsi_disk *sdkp;
3129 scsi_autopm_get_device(sdp);
3131 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
3134 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3138 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3142 gd = alloc_disk(SD_MINORS);
3147 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3150 spin_lock(&sd_index_lock);
3151 error = ida_get_new(&sd_index_ida, &index);
3152 spin_unlock(&sd_index_lock);
3153 } while (error == -EAGAIN);
3156 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3160 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3162 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3163 goto out_free_index;
3167 sdkp->driver = &sd_template;
3169 sdkp->index = index;
3170 atomic_set(&sdkp->openers, 0);
3171 atomic_set(&sdkp->device->ioerr_cnt, 0);
3173 if (!sdp->request_queue->rq_timeout) {
3174 if (sdp->type != TYPE_MOD)
3175 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3177 blk_queue_rq_timeout(sdp->request_queue,
3181 device_initialize(&sdkp->dev);
3182 sdkp->dev.parent = get_device(dev);
3183 sdkp->dev.class = &sd_disk_class;
3184 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3186 error = device_add(&sdkp->dev);
3188 put_device(&sdkp->dev);
3192 dev_set_drvdata(dev, sdkp);
3194 get_device(&sdkp->dev); /* prevent release before async_schedule */
3195 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3200 spin_lock(&sd_index_lock);
3201 ida_remove(&sd_index_ida, index);
3202 spin_unlock(&sd_index_lock);
3208 scsi_autopm_put_device(sdp);
3213 * sd_remove - called whenever a scsi disk (previously recognized by
3214 * sd_probe) is detached from the system. It is called (potentially
3215 * multiple times) during sd module unload.
3216 * @sdp: pointer to mid level scsi device object
3218 * Note: this function is invoked from the scsi mid-level.
3219 * This function potentially frees up a device name (e.g. /dev/sdc)
3220 * that could be re-used by a subsequent sd_probe().
3221 * This function is not called when the built-in sd driver is "exit-ed".
3223 static int sd_remove(struct device *dev)
3225 struct scsi_disk *sdkp;
3228 sdkp = dev_get_drvdata(dev);
3229 devt = disk_devt(sdkp->disk);
3230 scsi_autopm_get_device(sdkp->device);
3232 async_synchronize_full_domain(&scsi_sd_pm_domain);
3233 async_synchronize_full_domain(&scsi_sd_probe_domain);
3234 device_del(&sdkp->dev);
3235 del_gendisk(sdkp->disk);
3238 blk_register_region(devt, SD_MINORS, NULL,
3239 sd_default_probe, NULL, NULL);
3241 mutex_lock(&sd_ref_mutex);
3242 dev_set_drvdata(dev, NULL);
3243 put_device(&sdkp->dev);
3244 mutex_unlock(&sd_ref_mutex);
3250 * scsi_disk_release - Called to free the scsi_disk structure
3251 * @dev: pointer to embedded class device
3253 * sd_ref_mutex must be held entering this routine. Because it is
3254 * called on last put, you should always use the scsi_disk_get()
3255 * scsi_disk_put() helpers which manipulate the semaphore directly
3256 * and never do a direct put_device.
3258 static void scsi_disk_release(struct device *dev)
3260 struct scsi_disk *sdkp = to_scsi_disk(dev);
3261 struct gendisk *disk = sdkp->disk;
3262 struct request_queue *q = disk->queue;
3264 spin_lock(&sd_index_lock);
3265 ida_remove(&sd_index_ida, sdkp->index);
3266 spin_unlock(&sd_index_lock);
3269 * Wait until all requests that are in progress have completed.
3270 * This is necessary to avoid that e.g. scsi_end_request() crashes
3271 * due to clearing the disk->private_data pointer. Wait from inside
3272 * scsi_disk_release() instead of from sd_release() to avoid that
3273 * freezing and unfreezing the request queue affects user space I/O
3274 * in case multiple processes open a /dev/sd... node concurrently.
3276 blk_mq_freeze_queue(q);
3277 blk_mq_unfreeze_queue(q);
3279 disk->private_data = NULL;
3281 put_device(&sdkp->device->sdev_gendev);
3286 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3288 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3289 struct scsi_sense_hdr sshdr;
3290 struct scsi_device *sdp = sdkp->device;
3294 cmd[4] |= 1; /* START */
3296 if (sdp->start_stop_pwr_cond)
3297 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3299 if (!scsi_device_online(sdp))
3302 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3303 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3305 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3306 if (driver_byte(res) & DRIVER_SENSE)
3307 sd_print_sense_hdr(sdkp, &sshdr);
3308 if (scsi_sense_valid(&sshdr) &&
3309 /* 0x3a is medium not present */
3314 /* SCSI error codes must not go to the generic layer */
3322 * Send a SYNCHRONIZE CACHE instruction down to the device through
3323 * the normal SCSI command structure. Wait for the command to
3326 static void sd_shutdown(struct device *dev)
3328 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3331 return; /* this can happen */
3333 if (pm_runtime_suspended(dev))
3336 if (sdkp->WCE && sdkp->media_present) {
3337 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3338 sd_sync_cache(sdkp);
3341 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3342 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3343 sd_start_stop_device(sdkp, 0);
3347 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3349 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3352 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3355 if (sdkp->WCE && sdkp->media_present) {
3356 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3357 ret = sd_sync_cache(sdkp);
3359 /* ignore OFFLINE device */
3366 if (sdkp->device->manage_start_stop) {
3367 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3368 /* an error is not worth aborting a system sleep */
3369 ret = sd_start_stop_device(sdkp, 0);
3370 if (ignore_stop_errors)
3378 static int sd_suspend_system(struct device *dev)
3380 return sd_suspend_common(dev, true);
3383 static int sd_suspend_runtime(struct device *dev)
3385 return sd_suspend_common(dev, false);
3388 static int sd_resume(struct device *dev)
3390 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3392 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3395 if (!sdkp->device->manage_start_stop)
3398 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3399 return sd_start_stop_device(sdkp, 1);
3403 * init_sd - entry point for this driver (both when built in or when
3406 * Note: this function registers this driver with the scsi mid-level.
3408 static int __init init_sd(void)
3410 int majors = 0, i, err;
3412 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3414 for (i = 0; i < SD_MAJORS; i++) {
3415 if (register_blkdev(sd_major(i), "sd") != 0)
3418 blk_register_region(sd_major(i), SD_MINORS, NULL,
3419 sd_default_probe, NULL, NULL);
3425 err = class_register(&sd_disk_class);
3429 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3431 if (!sd_cdb_cache) {
3432 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3437 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3439 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3444 err = scsi_register_driver(&sd_template.gendrv);
3446 goto err_out_driver;
3451 mempool_destroy(sd_cdb_pool);
3454 kmem_cache_destroy(sd_cdb_cache);
3457 class_unregister(&sd_disk_class);
3459 for (i = 0; i < SD_MAJORS; i++)
3460 unregister_blkdev(sd_major(i), "sd");
3465 * exit_sd - exit point for this driver (when it is a module).
3467 * Note: this function unregisters this driver from the scsi mid-level.
3469 static void __exit exit_sd(void)
3473 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3475 scsi_unregister_driver(&sd_template.gendrv);
3476 mempool_destroy(sd_cdb_pool);
3477 kmem_cache_destroy(sd_cdb_cache);
3479 class_unregister(&sd_disk_class);
3481 for (i = 0; i < SD_MAJORS; i++) {
3482 blk_unregister_region(sd_major(i), SD_MINORS);
3483 unregister_blkdev(sd_major(i), "sd");
3487 module_init(init_sd);
3488 module_exit(exit_sd);
3490 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3491 struct scsi_sense_hdr *sshdr)
3493 scsi_print_sense_hdr(sdkp->device,
3494 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3497 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3500 const char *hb_string = scsi_hostbyte_string(result);
3501 const char *db_string = scsi_driverbyte_string(result);
3503 if (hb_string || db_string)
3504 sd_printk(KERN_INFO, sdkp,
3505 "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3506 hb_string ? hb_string : "invalid",
3507 db_string ? db_string : "invalid");
3509 sd_printk(KERN_INFO, sdkp,
3510 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3511 msg, host_byte(result), driver_byte(result));