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 <linux/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);
96 MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
98 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
104 static void sd_config_discard(struct scsi_disk *, unsigned int);
105 static void sd_config_write_same(struct scsi_disk *);
106 static int sd_revalidate_disk(struct gendisk *);
107 static void sd_unlock_native_capacity(struct gendisk *disk);
108 static int sd_probe(struct device *);
109 static int sd_remove(struct device *);
110 static void sd_shutdown(struct device *);
111 static int sd_suspend_system(struct device *);
112 static int sd_suspend_runtime(struct device *);
113 static int sd_resume(struct device *);
114 static void sd_rescan(struct device *);
115 static int sd_init_command(struct scsi_cmnd *SCpnt);
116 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
117 static int sd_done(struct scsi_cmnd *);
118 static int sd_eh_action(struct scsi_cmnd *, int);
119 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
120 static void scsi_disk_release(struct device *cdev);
121 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
122 static void sd_print_result(const struct scsi_disk *, const char *, int);
124 static DEFINE_SPINLOCK(sd_index_lock);
125 static DEFINE_IDA(sd_index_ida);
127 /* This semaphore is used to mediate the 0->1 reference get in the
128 * face of object destruction (i.e. we can't allow a get on an
129 * object after last put) */
130 static DEFINE_MUTEX(sd_ref_mutex);
132 static struct kmem_cache *sd_cdb_cache;
133 static mempool_t *sd_cdb_pool;
135 static const char *sd_cache_types[] = {
136 "write through", "none", "write back",
137 "write back, no read (daft)"
140 static void sd_set_flush_flag(struct scsi_disk *sdkp)
142 bool wc = false, fua = false;
150 blk_queue_write_cache(sdkp->disk->queue, wc, fua);
154 cache_type_store(struct device *dev, struct device_attribute *attr,
155 const char *buf, size_t count)
157 int i, ct = -1, rcd, wce, sp;
158 struct scsi_disk *sdkp = to_scsi_disk(dev);
159 struct scsi_device *sdp = sdkp->device;
162 struct scsi_mode_data data;
163 struct scsi_sense_hdr sshdr;
164 static const char temp[] = "temporary ";
167 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
168 /* no cache control on RBC devices; theoretically they
169 * can do it, but there's probably so many exceptions
170 * it's not worth the risk */
173 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
174 buf += sizeof(temp) - 1;
175 sdkp->cache_override = 1;
177 sdkp->cache_override = 0;
180 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
181 len = strlen(sd_cache_types[i]);
182 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
190 rcd = ct & 0x01 ? 1 : 0;
191 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
193 if (sdkp->cache_override) {
196 sd_set_flush_flag(sdkp);
200 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
201 SD_MAX_RETRIES, &data, NULL))
203 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
204 data.block_descriptor_length);
205 buffer_data = buffer + data.header_length +
206 data.block_descriptor_length;
207 buffer_data[2] &= ~0x05;
208 buffer_data[2] |= wce << 2 | rcd;
209 sp = buffer_data[0] & 0x80 ? 1 : 0;
210 buffer_data[0] &= ~0x80;
212 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
213 SD_MAX_RETRIES, &data, &sshdr)) {
214 if (scsi_sense_valid(&sshdr))
215 sd_print_sense_hdr(sdkp, &sshdr);
218 revalidate_disk(sdkp->disk);
223 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
226 struct scsi_disk *sdkp = to_scsi_disk(dev);
227 struct scsi_device *sdp = sdkp->device;
229 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
233 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
234 const char *buf, size_t count)
236 struct scsi_disk *sdkp = to_scsi_disk(dev);
237 struct scsi_device *sdp = sdkp->device;
239 if (!capable(CAP_SYS_ADMIN))
242 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
246 static DEVICE_ATTR_RW(manage_start_stop);
249 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
251 struct scsi_disk *sdkp = to_scsi_disk(dev);
253 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
257 allow_restart_store(struct device *dev, struct device_attribute *attr,
258 const char *buf, size_t count)
260 struct scsi_disk *sdkp = to_scsi_disk(dev);
261 struct scsi_device *sdp = sdkp->device;
263 if (!capable(CAP_SYS_ADMIN))
266 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
269 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
273 static DEVICE_ATTR_RW(allow_restart);
276 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
278 struct scsi_disk *sdkp = to_scsi_disk(dev);
279 int ct = sdkp->RCD + 2*sdkp->WCE;
281 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
283 static DEVICE_ATTR_RW(cache_type);
286 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
288 struct scsi_disk *sdkp = to_scsi_disk(dev);
290 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
292 static DEVICE_ATTR_RO(FUA);
295 protection_type_show(struct device *dev, struct device_attribute *attr,
298 struct scsi_disk *sdkp = to_scsi_disk(dev);
300 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
304 protection_type_store(struct device *dev, struct device_attribute *attr,
305 const char *buf, size_t count)
307 struct scsi_disk *sdkp = to_scsi_disk(dev);
311 if (!capable(CAP_SYS_ADMIN))
314 err = kstrtouint(buf, 10, &val);
319 if (val >= 0 && val <= T10_PI_TYPE3_PROTECTION)
320 sdkp->protection_type = val;
324 static DEVICE_ATTR_RW(protection_type);
327 protection_mode_show(struct device *dev, struct device_attribute *attr,
330 struct scsi_disk *sdkp = to_scsi_disk(dev);
331 struct scsi_device *sdp = sdkp->device;
332 unsigned int dif, dix;
334 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
335 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
337 if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
343 return snprintf(buf, 20, "none\n");
345 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
347 static DEVICE_ATTR_RO(protection_mode);
350 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
352 struct scsi_disk *sdkp = to_scsi_disk(dev);
354 return snprintf(buf, 20, "%u\n", sdkp->ATO);
356 static DEVICE_ATTR_RO(app_tag_own);
359 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
362 struct scsi_disk *sdkp = to_scsi_disk(dev);
364 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
366 static DEVICE_ATTR_RO(thin_provisioning);
368 static const char *lbp_mode[] = {
369 [SD_LBP_FULL] = "full",
370 [SD_LBP_UNMAP] = "unmap",
371 [SD_LBP_WS16] = "writesame_16",
372 [SD_LBP_WS10] = "writesame_10",
373 [SD_LBP_ZERO] = "writesame_zero",
374 [SD_LBP_DISABLE] = "disabled",
378 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
381 struct scsi_disk *sdkp = to_scsi_disk(dev);
383 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
387 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
388 const char *buf, size_t count)
390 struct scsi_disk *sdkp = to_scsi_disk(dev);
391 struct scsi_device *sdp = sdkp->device;
393 if (!capable(CAP_SYS_ADMIN))
396 if (sd_is_zoned(sdkp)) {
397 sd_config_discard(sdkp, SD_LBP_DISABLE);
401 if (sdp->type != TYPE_DISK)
404 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
405 sd_config_discard(sdkp, SD_LBP_UNMAP);
406 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
407 sd_config_discard(sdkp, SD_LBP_WS16);
408 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
409 sd_config_discard(sdkp, SD_LBP_WS10);
410 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
411 sd_config_discard(sdkp, SD_LBP_ZERO);
412 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
413 sd_config_discard(sdkp, SD_LBP_DISABLE);
419 static DEVICE_ATTR_RW(provisioning_mode);
422 max_medium_access_timeouts_show(struct device *dev,
423 struct device_attribute *attr, char *buf)
425 struct scsi_disk *sdkp = to_scsi_disk(dev);
427 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
431 max_medium_access_timeouts_store(struct device *dev,
432 struct device_attribute *attr, const char *buf,
435 struct scsi_disk *sdkp = to_scsi_disk(dev);
438 if (!capable(CAP_SYS_ADMIN))
441 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
443 return err ? err : count;
445 static DEVICE_ATTR_RW(max_medium_access_timeouts);
448 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
451 struct scsi_disk *sdkp = to_scsi_disk(dev);
453 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
457 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
458 const char *buf, size_t count)
460 struct scsi_disk *sdkp = to_scsi_disk(dev);
461 struct scsi_device *sdp = sdkp->device;
465 if (!capable(CAP_SYS_ADMIN))
468 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
471 err = kstrtoul(buf, 10, &max);
477 sdp->no_write_same = 1;
478 else if (max <= SD_MAX_WS16_BLOCKS) {
479 sdp->no_write_same = 0;
480 sdkp->max_ws_blocks = max;
483 sd_config_write_same(sdkp);
487 static DEVICE_ATTR_RW(max_write_same_blocks);
489 static struct attribute *sd_disk_attrs[] = {
490 &dev_attr_cache_type.attr,
492 &dev_attr_allow_restart.attr,
493 &dev_attr_manage_start_stop.attr,
494 &dev_attr_protection_type.attr,
495 &dev_attr_protection_mode.attr,
496 &dev_attr_app_tag_own.attr,
497 &dev_attr_thin_provisioning.attr,
498 &dev_attr_provisioning_mode.attr,
499 &dev_attr_max_write_same_blocks.attr,
500 &dev_attr_max_medium_access_timeouts.attr,
503 ATTRIBUTE_GROUPS(sd_disk);
505 static struct class sd_disk_class = {
507 .owner = THIS_MODULE,
508 .dev_release = scsi_disk_release,
509 .dev_groups = sd_disk_groups,
512 static const struct dev_pm_ops sd_pm_ops = {
513 .suspend = sd_suspend_system,
515 .poweroff = sd_suspend_system,
516 .restore = sd_resume,
517 .runtime_suspend = sd_suspend_runtime,
518 .runtime_resume = sd_resume,
521 static struct scsi_driver sd_template = {
524 .owner = THIS_MODULE,
527 .shutdown = sd_shutdown,
531 .init_command = sd_init_command,
532 .uninit_command = sd_uninit_command,
534 .eh_action = sd_eh_action,
538 * Dummy kobj_map->probe function.
539 * The default ->probe function will call modprobe, which is
540 * pointless as this module is already loaded.
542 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
548 * Device no to disk mapping:
550 * major disc2 disc p1
551 * |............|.............|....|....| <- dev_t
554 * Inside a major, we have 16k disks, however mapped non-
555 * contiguously. The first 16 disks are for major0, the next
556 * ones with major1, ... Disk 256 is for major0 again, disk 272
558 * As we stay compatible with our numbering scheme, we can reuse
559 * the well-know SCSI majors 8, 65--71, 136--143.
561 static int sd_major(int major_idx)
565 return SCSI_DISK0_MAJOR;
567 return SCSI_DISK1_MAJOR + major_idx - 1;
569 return SCSI_DISK8_MAJOR + major_idx - 8;
572 return 0; /* shut up gcc */
576 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
578 struct scsi_disk *sdkp = NULL;
580 mutex_lock(&sd_ref_mutex);
582 if (disk->private_data) {
583 sdkp = scsi_disk(disk);
584 if (scsi_device_get(sdkp->device) == 0)
585 get_device(&sdkp->dev);
589 mutex_unlock(&sd_ref_mutex);
593 static void scsi_disk_put(struct scsi_disk *sdkp)
595 struct scsi_device *sdev = sdkp->device;
597 mutex_lock(&sd_ref_mutex);
598 put_device(&sdkp->dev);
599 scsi_device_put(sdev);
600 mutex_unlock(&sd_ref_mutex);
603 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
604 unsigned int dix, unsigned int dif)
606 struct bio *bio = scmd->request->bio;
607 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
608 unsigned int protect = 0;
610 if (dix) { /* DIX Type 0, 1, 2, 3 */
611 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
612 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
614 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
615 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
618 if (dif != T10_PI_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
619 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
621 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
622 scmd->prot_flags |= SCSI_PROT_REF_CHECK;
625 if (dif) { /* DIX/DIF Type 1, 2, 3 */
626 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
628 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
629 protect = 3 << 5; /* Disable target PI checking */
631 protect = 1 << 5; /* Enable target PI checking */
634 scsi_set_prot_op(scmd, prot_op);
635 scsi_set_prot_type(scmd, dif);
636 scmd->prot_flags &= sd_prot_flag_mask(prot_op);
641 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
643 struct request_queue *q = sdkp->disk->queue;
644 unsigned int logical_block_size = sdkp->device->sector_size;
645 unsigned int max_blocks = 0;
647 q->limits.discard_zeroes_data = 0;
650 * When LBPRZ is reported, discard alignment and granularity
651 * must be fixed to the logical block size. Otherwise the block
652 * layer will drop misaligned portions of the request which can
653 * lead to data corruption. If LBPRZ is not set, we honor the
657 q->limits.discard_alignment = 0;
658 q->limits.discard_granularity = logical_block_size;
660 q->limits.discard_alignment = sdkp->unmap_alignment *
662 q->limits.discard_granularity =
663 max(sdkp->physical_block_size,
664 sdkp->unmap_granularity * logical_block_size);
667 sdkp->provisioning_mode = mode;
672 blk_queue_max_discard_sectors(q, 0);
673 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
677 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
678 (u32)SD_MAX_WS16_BLOCKS);
682 max_blocks = min_not_zero(sdkp->max_ws_blocks,
683 (u32)SD_MAX_WS16_BLOCKS);
684 q->limits.discard_zeroes_data = sdkp->lbprz;
688 max_blocks = min_not_zero(sdkp->max_ws_blocks,
689 (u32)SD_MAX_WS10_BLOCKS);
690 q->limits.discard_zeroes_data = sdkp->lbprz;
694 max_blocks = min_not_zero(sdkp->max_ws_blocks,
695 (u32)SD_MAX_WS10_BLOCKS);
696 q->limits.discard_zeroes_data = 1;
700 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
701 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
705 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
706 * @sdp: scsi device to operate on
707 * @rq: Request to prepare
709 * Will issue either UNMAP or WRITE SAME(16) depending on preference
710 * indicated by target device.
712 static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
714 struct request *rq = cmd->request;
715 struct scsi_device *sdp = cmd->device;
716 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
717 sector_t sector = blk_rq_pos(rq);
718 unsigned int nr_sectors = blk_rq_sectors(rq);
724 sector >>= ilog2(sdp->sector_size) - 9;
725 nr_sectors >>= ilog2(sdp->sector_size) - 9;
727 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
729 return BLKPREP_DEFER;
731 switch (sdkp->provisioning_mode) {
733 buf = page_address(page);
736 cmd->cmnd[0] = UNMAP;
739 put_unaligned_be16(6 + 16, &buf[0]);
740 put_unaligned_be16(16, &buf[2]);
741 put_unaligned_be64(sector, &buf[8]);
742 put_unaligned_be32(nr_sectors, &buf[16]);
749 cmd->cmnd[0] = WRITE_SAME_16;
750 cmd->cmnd[1] = 0x8; /* UNMAP */
751 put_unaligned_be64(sector, &cmd->cmnd[2]);
752 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
754 len = sdkp->device->sector_size;
760 cmd->cmnd[0] = WRITE_SAME;
761 if (sdkp->provisioning_mode == SD_LBP_WS10)
762 cmd->cmnd[1] = 0x8; /* UNMAP */
763 put_unaligned_be32(sector, &cmd->cmnd[2]);
764 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
766 len = sdkp->device->sector_size;
770 ret = BLKPREP_INVALID;
774 rq->timeout = SD_TIMEOUT;
776 cmd->transfersize = len;
777 cmd->allowed = SD_MAX_RETRIES;
779 rq->special_vec.bv_page = page;
780 rq->special_vec.bv_offset = 0;
781 rq->special_vec.bv_len = len;
783 rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
784 scsi_req(rq)->resid_len = len;
786 ret = scsi_init_io(cmd);
788 if (ret != BLKPREP_OK)
793 static void sd_config_write_same(struct scsi_disk *sdkp)
795 struct request_queue *q = sdkp->disk->queue;
796 unsigned int logical_block_size = sdkp->device->sector_size;
798 if (sdkp->device->no_write_same) {
799 sdkp->max_ws_blocks = 0;
803 /* Some devices can not handle block counts above 0xffff despite
804 * supporting WRITE SAME(16). Consequently we default to 64k
805 * blocks per I/O unless the device explicitly advertises a
808 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
809 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
810 (u32)SD_MAX_WS16_BLOCKS);
811 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
812 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
813 (u32)SD_MAX_WS10_BLOCKS);
815 sdkp->device->no_write_same = 1;
816 sdkp->max_ws_blocks = 0;
820 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
821 (logical_block_size >> 9));
825 * sd_setup_write_same_cmnd - write the same data to multiple blocks
826 * @cmd: command to prepare
828 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
829 * preference indicated by target device.
831 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
833 struct request *rq = cmd->request;
834 struct scsi_device *sdp = cmd->device;
835 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
836 struct bio *bio = rq->bio;
837 sector_t sector = blk_rq_pos(rq);
838 unsigned int nr_sectors = blk_rq_sectors(rq);
839 unsigned int nr_bytes = blk_rq_bytes(rq);
842 if (sdkp->device->no_write_same)
843 return BLKPREP_INVALID;
845 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
847 if (sd_is_zoned(sdkp)) {
848 ret = sd_zbc_setup_write_cmnd(cmd);
849 if (ret != BLKPREP_OK)
853 sector >>= ilog2(sdp->sector_size) - 9;
854 nr_sectors >>= ilog2(sdp->sector_size) - 9;
856 rq->timeout = SD_WRITE_SAME_TIMEOUT;
858 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
860 cmd->cmnd[0] = WRITE_SAME_16;
861 put_unaligned_be64(sector, &cmd->cmnd[2]);
862 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
865 cmd->cmnd[0] = WRITE_SAME;
866 put_unaligned_be32(sector, &cmd->cmnd[2]);
867 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
870 cmd->transfersize = sdp->sector_size;
871 cmd->allowed = SD_MAX_RETRIES;
874 * For WRITE SAME the data transferred via the DATA OUT buffer is
875 * different from the amount of data actually written to the target.
877 * We set up __data_len to the amount of data transferred via the
878 * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
879 * to transfer a single sector of data first, but then reset it to
880 * the amount of data to be written right after so that the I/O path
881 * knows how much to actually write.
883 rq->__data_len = sdp->sector_size;
884 ret = scsi_init_io(cmd);
885 rq->__data_len = nr_bytes;
889 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
891 struct request *rq = cmd->request;
893 /* flush requests don't perform I/O, zero the S/G table */
894 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
896 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
898 cmd->transfersize = 0;
899 cmd->allowed = SD_MAX_RETRIES;
901 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
905 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
907 struct request *rq = SCpnt->request;
908 struct scsi_device *sdp = SCpnt->device;
909 struct gendisk *disk = rq->rq_disk;
910 struct scsi_disk *sdkp = scsi_disk(disk);
911 sector_t block = blk_rq_pos(rq);
913 unsigned int this_count = blk_rq_sectors(rq);
914 unsigned int dif, dix;
915 bool zoned_write = sd_is_zoned(sdkp) && rq_data_dir(rq) == WRITE;
917 unsigned char protect;
920 ret = sd_zbc_setup_write_cmnd(SCpnt);
921 if (ret != BLKPREP_OK)
925 ret = scsi_init_io(SCpnt);
926 if (ret != BLKPREP_OK)
930 /* from here on until we're complete, any goto out
931 * is used for a killable error condition */
935 scmd_printk(KERN_INFO, SCpnt,
936 "%s: block=%llu, count=%d\n",
937 __func__, (unsigned long long)block, this_count));
939 if (!sdp || !scsi_device_online(sdp) ||
940 block + blk_rq_sectors(rq) > get_capacity(disk)) {
941 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
942 "Finishing %u sectors\n",
943 blk_rq_sectors(rq)));
944 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
945 "Retry with 0x%p\n", SCpnt));
951 * quietly refuse to do anything to a changed disc until
952 * the changed bit has been reset
954 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
959 * Some SD card readers can't handle multi-sector accesses which touch
960 * the last one or two hardware sectors. Split accesses as needed.
962 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
963 (sdp->sector_size / 512);
965 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
966 if (block < threshold) {
967 /* Access up to the threshold but not beyond */
968 this_count = threshold - block;
970 /* Access only a single hardware sector */
971 this_count = sdp->sector_size / 512;
975 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
976 (unsigned long long)block));
979 * If we have a 1K hardware sectorsize, prevent access to single
980 * 512 byte sectors. In theory we could handle this - in fact
981 * the scsi cdrom driver must be able to handle this because
982 * we typically use 1K blocksizes, and cdroms typically have
983 * 2K hardware sectorsizes. Of course, things are simpler
984 * with the cdrom, since it is read-only. For performance
985 * reasons, the filesystems should be able to handle this
986 * and not force the scsi disk driver to use bounce buffers
989 if (sdp->sector_size == 1024) {
990 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
991 scmd_printk(KERN_ERR, SCpnt,
992 "Bad block number requested\n");
996 this_count = this_count >> 1;
999 if (sdp->sector_size == 2048) {
1000 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
1001 scmd_printk(KERN_ERR, SCpnt,
1002 "Bad block number requested\n");
1006 this_count = this_count >> 2;
1009 if (sdp->sector_size == 4096) {
1010 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
1011 scmd_printk(KERN_ERR, SCpnt,
1012 "Bad block number requested\n");
1016 this_count = this_count >> 3;
1019 if (rq_data_dir(rq) == WRITE) {
1020 SCpnt->cmnd[0] = WRITE_6;
1022 if (blk_integrity_rq(rq))
1023 sd_dif_prepare(SCpnt);
1025 } else if (rq_data_dir(rq) == READ) {
1026 SCpnt->cmnd[0] = READ_6;
1028 scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq));
1032 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1033 "%s %d/%u 512 byte blocks.\n",
1034 (rq_data_dir(rq) == WRITE) ?
1035 "writing" : "reading", this_count,
1036 blk_rq_sectors(rq)));
1038 dix = scsi_prot_sg_count(SCpnt);
1039 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1042 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1046 if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1047 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1049 if (unlikely(SCpnt->cmnd == NULL)) {
1050 ret = BLKPREP_DEFER;
1054 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1055 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1056 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1057 SCpnt->cmnd[7] = 0x18;
1058 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1059 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1062 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1063 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1064 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1065 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1066 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1067 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1068 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1069 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1071 /* Expected Indirect LBA */
1072 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1073 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1074 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1075 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1077 /* Transfer length */
1078 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1079 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1080 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1081 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1082 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1083 SCpnt->cmnd[0] += READ_16 - READ_6;
1084 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1085 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1086 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1087 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1088 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1089 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1090 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1091 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1092 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1093 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1094 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1095 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1096 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1097 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1098 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1099 scsi_device_protection(SCpnt->device) ||
1100 SCpnt->device->use_10_for_rw) {
1101 SCpnt->cmnd[0] += READ_10 - READ_6;
1102 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1103 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1104 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1105 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1106 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1107 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1108 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1109 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1111 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1113 * This happens only if this drive failed
1114 * 10byte rw command with ILLEGAL_REQUEST
1115 * during operation and thus turned off
1118 scmd_printk(KERN_ERR, SCpnt,
1119 "FUA write on READ/WRITE(6) drive\n");
1123 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1124 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1125 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1126 SCpnt->cmnd[4] = (unsigned char) this_count;
1129 SCpnt->sdb.length = this_count * sdp->sector_size;
1132 * We shouldn't disconnect in the middle of a sector, so with a dumb
1133 * host adapter, it's safe to assume that we can at least transfer
1134 * this many bytes between each connect / disconnect.
1136 SCpnt->transfersize = sdp->sector_size;
1137 SCpnt->underflow = this_count << 9;
1138 SCpnt->allowed = SD_MAX_RETRIES;
1141 * This indicates that the command is ready from our end to be
1146 if (zoned_write && ret != BLKPREP_OK)
1147 sd_zbc_cancel_write_cmnd(SCpnt);
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);
1166 case REQ_OP_ZONE_REPORT:
1167 return sd_zbc_setup_report_cmnd(cmd);
1168 case REQ_OP_ZONE_RESET:
1169 return sd_zbc_setup_reset_cmnd(cmd);
1175 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1177 struct request *rq = SCpnt->request;
1179 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1180 __free_page(rq->special_vec.bv_page);
1182 if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1183 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1190 * sd_open - open a scsi disk device
1191 * @inode: only i_rdev member may be used
1192 * @filp: only f_mode and f_flags may be used
1194 * Returns 0 if successful. Returns a negated errno value in case
1197 * Note: This can be called from a user context (e.g. fsck(1) )
1198 * or from within the kernel (e.g. as a result of a mount(1) ).
1199 * In the latter case @inode and @filp carry an abridged amount
1200 * of information as noted above.
1202 * Locking: called with bdev->bd_mutex held.
1204 static int sd_open(struct block_device *bdev, fmode_t mode)
1206 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1207 struct scsi_device *sdev;
1213 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1215 sdev = sdkp->device;
1218 * If the device is in error recovery, wait until it is done.
1219 * If the device is offline, then disallow any access to it.
1222 if (!scsi_block_when_processing_errors(sdev))
1225 if (sdev->removable || sdkp->write_prot)
1226 check_disk_change(bdev);
1229 * If the drive is empty, just let the open fail.
1231 retval = -ENOMEDIUM;
1232 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1236 * If the device has the write protect tab set, have the open fail
1237 * if the user expects to be able to write to the thing.
1240 if (sdkp->write_prot && (mode & FMODE_WRITE))
1244 * It is possible that the disk changing stuff resulted in
1245 * the device being taken offline. If this is the case,
1246 * report this to the user, and don't pretend that the
1247 * open actually succeeded.
1250 if (!scsi_device_online(sdev))
1253 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1254 if (scsi_block_when_processing_errors(sdev))
1255 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1261 scsi_disk_put(sdkp);
1266 * sd_release - invoked when the (last) close(2) is called on this
1268 * @inode: only i_rdev member may be used
1269 * @filp: only f_mode and f_flags may be used
1273 * Note: may block (uninterruptible) if error recovery is underway
1276 * Locking: called with bdev->bd_mutex held.
1278 static void sd_release(struct gendisk *disk, fmode_t mode)
1280 struct scsi_disk *sdkp = scsi_disk(disk);
1281 struct scsi_device *sdev = sdkp->device;
1283 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1285 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1286 if (scsi_block_when_processing_errors(sdev))
1287 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1291 * XXX and what if there are packets in flight and this close()
1292 * XXX is followed by a "rmmod sd_mod"?
1295 scsi_disk_put(sdkp);
1298 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1300 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1301 struct scsi_device *sdp = sdkp->device;
1302 struct Scsi_Host *host = sdp->host;
1303 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1306 /* default to most commonly used values */
1307 diskinfo[0] = 0x40; /* 1 << 6 */
1308 diskinfo[1] = 0x20; /* 1 << 5 */
1309 diskinfo[2] = capacity >> 11;
1311 /* override with calculated, extended default, or driver values */
1312 if (host->hostt->bios_param)
1313 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1315 scsicam_bios_param(bdev, capacity, diskinfo);
1317 geo->heads = diskinfo[0];
1318 geo->sectors = diskinfo[1];
1319 geo->cylinders = diskinfo[2];
1324 * sd_ioctl - process an ioctl
1325 * @inode: only i_rdev/i_bdev members may be used
1326 * @filp: only f_mode and f_flags may be used
1327 * @cmd: ioctl command number
1328 * @arg: this is third argument given to ioctl(2) system call.
1329 * Often contains a pointer.
1331 * Returns 0 if successful (some ioctls return positive numbers on
1332 * success as well). Returns a negated errno value in case of error.
1334 * Note: most ioctls are forward onto the block subsystem or further
1335 * down in the scsi subsystem.
1337 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1338 unsigned int cmd, unsigned long arg)
1340 struct gendisk *disk = bdev->bd_disk;
1341 struct scsi_disk *sdkp = scsi_disk(disk);
1342 struct scsi_device *sdp = sdkp->device;
1343 void __user *p = (void __user *)arg;
1346 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1347 "cmd=0x%x\n", disk->disk_name, cmd));
1349 error = scsi_verify_blk_ioctl(bdev, cmd);
1354 * If we are in the middle of error recovery, don't let anyone
1355 * else try and use this device. Also, if error recovery fails, it
1356 * may try and take the device offline, in which case all further
1357 * access to the device is prohibited.
1359 error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1360 (mode & FMODE_NDELAY) != 0);
1365 * Send SCSI addressing ioctls directly to mid level, send other
1366 * ioctls to block level and then onto mid level if they can't be
1370 case SCSI_IOCTL_GET_IDLUN:
1371 case SCSI_IOCTL_GET_BUS_NUMBER:
1372 error = scsi_ioctl(sdp, cmd, p);
1375 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1376 if (error != -ENOTTY)
1378 error = scsi_ioctl(sdp, cmd, p);
1385 static void set_media_not_present(struct scsi_disk *sdkp)
1387 if (sdkp->media_present)
1388 sdkp->device->changed = 1;
1390 if (sdkp->device->removable) {
1391 sdkp->media_present = 0;
1396 static int media_not_present(struct scsi_disk *sdkp,
1397 struct scsi_sense_hdr *sshdr)
1399 if (!scsi_sense_valid(sshdr))
1402 /* not invoked for commands that could return deferred errors */
1403 switch (sshdr->sense_key) {
1404 case UNIT_ATTENTION:
1406 /* medium not present */
1407 if (sshdr->asc == 0x3A) {
1408 set_media_not_present(sdkp);
1416 * sd_check_events - check media events
1417 * @disk: kernel device descriptor
1418 * @clearing: disk events currently being cleared
1420 * Returns mask of DISK_EVENT_*.
1422 * Note: this function is invoked from the block subsystem.
1424 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1426 struct scsi_disk *sdkp = scsi_disk_get(disk);
1427 struct scsi_device *sdp;
1434 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1437 * If the device is offline, don't send any commands - just pretend as
1438 * if the command failed. If the device ever comes back online, we
1439 * can deal with it then. It is only because of unrecoverable errors
1440 * that we would ever take a device offline in the first place.
1442 if (!scsi_device_online(sdp)) {
1443 set_media_not_present(sdkp);
1448 * Using TEST_UNIT_READY enables differentiation between drive with
1449 * no cartridge loaded - NOT READY, drive with changed cartridge -
1450 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1452 * Drives that auto spin down. eg iomega jaz 1G, will be started
1453 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1454 * sd_revalidate() is called.
1456 if (scsi_block_when_processing_errors(sdp)) {
1457 struct scsi_sense_hdr sshdr = { 0, };
1459 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1462 /* failed to execute TUR, assume media not present */
1463 if (host_byte(retval)) {
1464 set_media_not_present(sdkp);
1468 if (media_not_present(sdkp, &sshdr))
1473 * For removable scsi disk we have to recognise the presence
1474 * of a disk in the drive.
1476 if (!sdkp->media_present)
1478 sdkp->media_present = 1;
1481 * sdp->changed is set under the following conditions:
1483 * Medium present state has changed in either direction.
1484 * Device has indicated UNIT_ATTENTION.
1486 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1488 scsi_disk_put(sdkp);
1492 static int sd_sync_cache(struct scsi_disk *sdkp)
1495 struct scsi_device *sdp = sdkp->device;
1496 const int timeout = sdp->request_queue->rq_timeout
1497 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1498 struct scsi_sense_hdr sshdr;
1500 if (!scsi_device_online(sdp))
1503 for (retries = 3; retries > 0; --retries) {
1504 unsigned char cmd[10] = { 0 };
1506 cmd[0] = SYNCHRONIZE_CACHE;
1508 * Leave the rest of the command zero to indicate
1511 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
1512 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1518 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1520 if (driver_byte(res) & DRIVER_SENSE)
1521 sd_print_sense_hdr(sdkp, &sshdr);
1522 /* we need to evaluate the error return */
1523 if (scsi_sense_valid(&sshdr) &&
1524 (sshdr.asc == 0x3a || /* medium not present */
1525 sshdr.asc == 0x20)) /* invalid command */
1526 /* this is no error here */
1529 switch (host_byte(res)) {
1530 /* ignore errors due to racing a disconnection */
1531 case DID_BAD_TARGET:
1532 case DID_NO_CONNECT:
1534 /* signal the upper layer it might try again */
1538 case DID_SOFT_ERROR:
1547 static void sd_rescan(struct device *dev)
1549 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1551 revalidate_disk(sdkp->disk);
1555 #ifdef CONFIG_COMPAT
1557 * This gets directly called from VFS. When the ioctl
1558 * is not recognized we go back to the other translation paths.
1560 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1561 unsigned int cmd, unsigned long arg)
1563 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1566 error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1567 (mode & FMODE_NDELAY) != 0);
1572 * Let the static ioctl translation table take care of it.
1574 if (!sdev->host->hostt->compat_ioctl)
1575 return -ENOIOCTLCMD;
1576 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1580 static char sd_pr_type(enum pr_type type)
1583 case PR_WRITE_EXCLUSIVE:
1585 case PR_EXCLUSIVE_ACCESS:
1587 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1589 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1591 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1593 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1600 static int sd_pr_command(struct block_device *bdev, u8 sa,
1601 u64 key, u64 sa_key, u8 type, u8 flags)
1603 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1604 struct scsi_sense_hdr sshdr;
1606 u8 cmd[16] = { 0, };
1607 u8 data[24] = { 0, };
1609 cmd[0] = PERSISTENT_RESERVE_OUT;
1612 put_unaligned_be32(sizeof(data), &cmd[5]);
1614 put_unaligned_be64(key, &data[0]);
1615 put_unaligned_be64(sa_key, &data[8]);
1618 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1619 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1621 if ((driver_byte(result) & DRIVER_SENSE) &&
1622 (scsi_sense_valid(&sshdr))) {
1623 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1624 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1630 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1633 if (flags & ~PR_FL_IGNORE_KEY)
1635 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1636 old_key, new_key, 0,
1637 (1 << 0) /* APTPL */);
1640 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1645 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1648 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1650 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1653 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1654 enum pr_type type, bool abort)
1656 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1657 sd_pr_type(type), 0);
1660 static int sd_pr_clear(struct block_device *bdev, u64 key)
1662 return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1665 static const struct pr_ops sd_pr_ops = {
1666 .pr_register = sd_pr_register,
1667 .pr_reserve = sd_pr_reserve,
1668 .pr_release = sd_pr_release,
1669 .pr_preempt = sd_pr_preempt,
1670 .pr_clear = sd_pr_clear,
1673 static const struct block_device_operations sd_fops = {
1674 .owner = THIS_MODULE,
1676 .release = sd_release,
1678 .getgeo = sd_getgeo,
1679 #ifdef CONFIG_COMPAT
1680 .compat_ioctl = sd_compat_ioctl,
1682 .check_events = sd_check_events,
1683 .revalidate_disk = sd_revalidate_disk,
1684 .unlock_native_capacity = sd_unlock_native_capacity,
1685 .pr_ops = &sd_pr_ops,
1689 * sd_eh_action - error handling callback
1690 * @scmd: sd-issued command that has failed
1691 * @eh_disp: The recovery disposition suggested by the midlayer
1693 * This function is called by the SCSI midlayer upon completion of an
1694 * error test command (currently TEST UNIT READY). The result of sending
1695 * the eh command is passed in eh_disp. We're looking for devices that
1696 * fail medium access commands but are OK with non access commands like
1697 * test unit ready (so wrongly see the device as having a successful
1700 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1702 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1704 if (!scsi_device_online(scmd->device) ||
1705 !scsi_medium_access_command(scmd) ||
1706 host_byte(scmd->result) != DID_TIME_OUT ||
1711 * The device has timed out executing a medium access command.
1712 * However, the TEST UNIT READY command sent during error
1713 * handling completed successfully. Either the device is in the
1714 * process of recovering or has it suffered an internal failure
1715 * that prevents access to the storage medium.
1717 sdkp->medium_access_timed_out++;
1720 * If the device keeps failing read/write commands but TEST UNIT
1721 * READY always completes successfully we assume that medium
1722 * access is no longer possible and take the device offline.
1724 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1725 scmd_printk(KERN_ERR, scmd,
1726 "Medium access timeout failure. Offlining disk!\n");
1727 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1735 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1737 u64 start_lba = blk_rq_pos(scmd->request);
1738 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1739 u64 factor = scmd->device->sector_size / 512;
1743 * resid is optional but mostly filled in. When it's unused,
1744 * its value is zero, so we assume the whole buffer transferred
1746 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1747 unsigned int good_bytes;
1749 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1750 SCSI_SENSE_BUFFERSIZE,
1755 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1758 /* be careful ... don't want any overflows */
1759 do_div(start_lba, factor);
1760 do_div(end_lba, factor);
1762 /* The bad lba was reported incorrectly, we have no idea where
1765 if (bad_lba < start_lba || bad_lba >= end_lba)
1768 /* This computation should always be done in terms of
1769 * the resolution of the device's medium.
1771 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1772 return min(good_bytes, transferred);
1776 * sd_done - bottom half handler: called when the lower level
1777 * driver has completed (successfully or otherwise) a scsi command.
1778 * @SCpnt: mid-level's per command structure.
1780 * Note: potentially run from within an ISR. Must not block.
1782 static int sd_done(struct scsi_cmnd *SCpnt)
1784 int result = SCpnt->result;
1785 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1786 unsigned int sector_size = SCpnt->device->sector_size;
1788 struct scsi_sense_hdr sshdr;
1789 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1790 struct request *req = SCpnt->request;
1791 int sense_valid = 0;
1792 int sense_deferred = 0;
1793 unsigned char op = SCpnt->cmnd[0];
1794 unsigned char unmap = SCpnt->cmnd[1] & 8;
1796 switch (req_op(req)) {
1797 case REQ_OP_DISCARD:
1798 case REQ_OP_WRITE_SAME:
1799 case REQ_OP_ZONE_RESET:
1801 good_bytes = blk_rq_bytes(req);
1802 scsi_set_resid(SCpnt, 0);
1805 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1808 case REQ_OP_ZONE_REPORT:
1810 good_bytes = scsi_bufflen(SCpnt)
1811 - scsi_get_resid(SCpnt);
1812 scsi_set_resid(SCpnt, 0);
1815 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1820 * In case of bogus fw or device, we could end up having
1821 * an unaligned partial completion. Check this here and force
1824 resid = scsi_get_resid(SCpnt);
1825 if (resid & (sector_size - 1)) {
1826 sd_printk(KERN_INFO, sdkp,
1827 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1828 resid, sector_size);
1829 resid = min(scsi_bufflen(SCpnt),
1830 round_up(resid, sector_size));
1831 scsi_set_resid(SCpnt, resid);
1836 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1838 sense_deferred = scsi_sense_is_deferred(&sshdr);
1840 sdkp->medium_access_timed_out = 0;
1842 if (driver_byte(result) != DRIVER_SENSE &&
1843 (!sense_valid || sense_deferred))
1846 switch (sshdr.sense_key) {
1847 case HARDWARE_ERROR:
1849 good_bytes = sd_completed_bytes(SCpnt);
1851 case RECOVERED_ERROR:
1852 good_bytes = scsi_bufflen(SCpnt);
1855 /* This indicates a false check condition, so ignore it. An
1856 * unknown amount of data was transferred so treat it as an
1860 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1862 case ABORTED_COMMAND:
1863 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1864 good_bytes = sd_completed_bytes(SCpnt);
1866 case ILLEGAL_REQUEST:
1867 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1868 good_bytes = sd_completed_bytes(SCpnt);
1869 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1870 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1873 sd_config_discard(sdkp, SD_LBP_DISABLE);
1878 sd_config_discard(sdkp, SD_LBP_DISABLE);
1880 sdkp->device->no_write_same = 1;
1881 sd_config_write_same(sdkp);
1884 req->__data_len = blk_rq_bytes(req);
1885 req->rq_flags |= RQF_QUIET;
1895 if (sd_is_zoned(sdkp))
1896 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
1898 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1899 "sd_done: completed %d of %d bytes\n",
1900 good_bytes, scsi_bufflen(SCpnt)));
1902 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1903 sd_dif_complete(SCpnt, good_bytes);
1909 * spinup disk - called only in sd_revalidate_disk()
1912 sd_spinup_disk(struct scsi_disk *sdkp)
1914 unsigned char cmd[10];
1915 unsigned long spintime_expire = 0;
1916 int retries, spintime;
1917 unsigned int the_result;
1918 struct scsi_sense_hdr sshdr;
1919 int sense_valid = 0;
1923 /* Spin up drives, as required. Only do this at boot time */
1924 /* Spinup needs to be done for module loads too. */
1929 cmd[0] = TEST_UNIT_READY;
1930 memset((void *) &cmd[1], 0, 9);
1932 the_result = scsi_execute_req(sdkp->device, cmd,
1935 SD_MAX_RETRIES, NULL);
1938 * If the drive has indicated to us that it
1939 * doesn't have any media in it, don't bother
1940 * with any more polling.
1942 if (media_not_present(sdkp, &sshdr))
1946 sense_valid = scsi_sense_valid(&sshdr);
1948 } while (retries < 3 &&
1949 (!scsi_status_is_good(the_result) ||
1950 ((driver_byte(the_result) & DRIVER_SENSE) &&
1951 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1953 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1954 /* no sense, TUR either succeeded or failed
1955 * with a status error */
1956 if(!spintime && !scsi_status_is_good(the_result)) {
1957 sd_print_result(sdkp, "Test Unit Ready failed",
1964 * The device does not want the automatic start to be issued.
1966 if (sdkp->device->no_start_on_add)
1969 if (sense_valid && sshdr.sense_key == NOT_READY) {
1970 if (sshdr.asc == 4 && sshdr.ascq == 3)
1971 break; /* manual intervention required */
1972 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1973 break; /* standby */
1974 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1975 break; /* unavailable */
1977 * Issue command to spin up drive when not ready
1980 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1981 cmd[0] = START_STOP;
1982 cmd[1] = 1; /* Return immediately */
1983 memset((void *) &cmd[2], 0, 8);
1984 cmd[4] = 1; /* Start spin cycle */
1985 if (sdkp->device->start_stop_pwr_cond)
1987 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1989 SD_TIMEOUT, SD_MAX_RETRIES,
1991 spintime_expire = jiffies + 100 * HZ;
1994 /* Wait 1 second for next try */
1999 * Wait for USB flash devices with slow firmware.
2000 * Yes, this sense key/ASC combination shouldn't
2001 * occur here. It's characteristic of these devices.
2003 } else if (sense_valid &&
2004 sshdr.sense_key == UNIT_ATTENTION &&
2005 sshdr.asc == 0x28) {
2007 spintime_expire = jiffies + 5 * HZ;
2010 /* Wait 1 second for next try */
2013 /* we don't understand the sense code, so it's
2014 * probably pointless to loop */
2016 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2017 sd_print_sense_hdr(sdkp, &sshdr);
2022 } while (spintime && time_before_eq(jiffies, spintime_expire));
2025 if (scsi_status_is_good(the_result))
2028 printk("not responding...\n");
2033 * Determine whether disk supports Data Integrity Field.
2035 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2037 struct scsi_device *sdp = sdkp->device;
2041 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2044 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2046 if (type > T10_PI_TYPE3_PROTECTION)
2048 else if (scsi_host_dif_capable(sdp->host, type))
2051 if (sdkp->first_scan || type != sdkp->protection_type)
2054 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2055 " protection type %u. Disabling disk!\n",
2059 sd_printk(KERN_NOTICE, sdkp,
2060 "Enabling DIF Type %u protection\n", type);
2063 sd_printk(KERN_NOTICE, sdkp,
2064 "Disabling DIF Type %u protection\n", type);
2068 sdkp->protection_type = type;
2073 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2074 struct scsi_sense_hdr *sshdr, int sense_valid,
2077 if (driver_byte(the_result) & DRIVER_SENSE)
2078 sd_print_sense_hdr(sdkp, sshdr);
2080 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2083 * Set dirty bit for removable devices if not ready -
2084 * sometimes drives will not report this properly.
2086 if (sdp->removable &&
2087 sense_valid && sshdr->sense_key == NOT_READY)
2088 set_media_not_present(sdkp);
2091 * We used to set media_present to 0 here to indicate no media
2092 * in the drive, but some drives fail read capacity even with
2093 * media present, so we can't do that.
2095 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2099 #if RC16_LEN > SD_BUF_SIZE
2100 #error RC16_LEN must not be more than SD_BUF_SIZE
2103 #define READ_CAPACITY_RETRIES_ON_RESET 10
2105 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2106 unsigned char *buffer)
2108 unsigned char cmd[16];
2109 struct scsi_sense_hdr sshdr;
2110 int sense_valid = 0;
2112 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2113 unsigned int alignment;
2114 unsigned long long lba;
2115 unsigned sector_size;
2117 if (sdp->no_read_capacity_16)
2122 cmd[0] = SERVICE_ACTION_IN_16;
2123 cmd[1] = SAI_READ_CAPACITY_16;
2125 memset(buffer, 0, RC16_LEN);
2127 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2128 buffer, RC16_LEN, &sshdr,
2129 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2131 if (media_not_present(sdkp, &sshdr))
2135 sense_valid = scsi_sense_valid(&sshdr);
2137 sshdr.sense_key == ILLEGAL_REQUEST &&
2138 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2140 /* Invalid Command Operation Code or
2141 * Invalid Field in CDB, just retry
2142 * silently with RC10 */
2145 sshdr.sense_key == UNIT_ATTENTION &&
2146 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2147 /* Device reset might occur several times,
2148 * give it one more chance */
2149 if (--reset_retries > 0)
2154 } while (the_result && retries);
2157 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2158 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2162 sector_size = get_unaligned_be32(&buffer[8]);
2163 lba = get_unaligned_be64(&buffer[0]);
2165 if (sd_read_protection_type(sdkp, buffer) < 0) {
2170 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2171 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2172 "kernel compiled with support for large block "
2178 /* Logical blocks per physical block exponent */
2179 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2182 sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2184 /* Lowest aligned logical block */
2185 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2186 blk_queue_alignment_offset(sdp->request_queue, alignment);
2187 if (alignment && sdkp->first_scan)
2188 sd_printk(KERN_NOTICE, sdkp,
2189 "physical block alignment offset: %u\n", alignment);
2191 if (buffer[14] & 0x80) { /* LBPME */
2194 if (buffer[14] & 0x40) /* LBPRZ */
2197 sd_config_discard(sdkp, SD_LBP_WS16);
2200 sdkp->capacity = lba + 1;
2204 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2205 unsigned char *buffer)
2207 unsigned char cmd[16];
2208 struct scsi_sense_hdr sshdr;
2209 int sense_valid = 0;
2211 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2213 unsigned sector_size;
2216 cmd[0] = READ_CAPACITY;
2217 memset(&cmd[1], 0, 9);
2218 memset(buffer, 0, 8);
2220 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2222 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2224 if (media_not_present(sdkp, &sshdr))
2228 sense_valid = scsi_sense_valid(&sshdr);
2230 sshdr.sense_key == UNIT_ATTENTION &&
2231 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2232 /* Device reset might occur several times,
2233 * give it one more chance */
2234 if (--reset_retries > 0)
2239 } while (the_result && retries);
2242 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2243 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2247 sector_size = get_unaligned_be32(&buffer[4]);
2248 lba = get_unaligned_be32(&buffer[0]);
2250 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2251 /* Some buggy (usb cardreader) devices return an lba of
2252 0xffffffff when the want to report a size of 0 (with
2253 which they really mean no media is present) */
2255 sdkp->physical_block_size = sector_size;
2259 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2260 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2261 "kernel compiled with support for large block "
2267 sdkp->capacity = lba + 1;
2268 sdkp->physical_block_size = sector_size;
2272 static int sd_try_rc16_first(struct scsi_device *sdp)
2274 if (sdp->host->max_cmd_len < 16)
2276 if (sdp->try_rc_10_first)
2278 if (sdp->scsi_level > SCSI_SPC_2)
2280 if (scsi_device_protection(sdp))
2286 * read disk capacity
2289 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2292 struct scsi_device *sdp = sdkp->device;
2294 if (sd_try_rc16_first(sdp)) {
2295 sector_size = read_capacity_16(sdkp, sdp, buffer);
2296 if (sector_size == -EOVERFLOW)
2298 if (sector_size == -ENODEV)
2300 if (sector_size < 0)
2301 sector_size = read_capacity_10(sdkp, sdp, buffer);
2302 if (sector_size < 0)
2305 sector_size = read_capacity_10(sdkp, sdp, buffer);
2306 if (sector_size == -EOVERFLOW)
2308 if (sector_size < 0)
2310 if ((sizeof(sdkp->capacity) > 4) &&
2311 (sdkp->capacity > 0xffffffffULL)) {
2312 int old_sector_size = sector_size;
2313 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2314 "Trying to use READ CAPACITY(16).\n");
2315 sector_size = read_capacity_16(sdkp, sdp, buffer);
2316 if (sector_size < 0) {
2317 sd_printk(KERN_NOTICE, sdkp,
2318 "Using 0xffffffff as device size\n");
2319 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2320 sector_size = old_sector_size;
2326 /* Some devices are known to return the total number of blocks,
2327 * not the highest block number. Some devices have versions
2328 * which do this and others which do not. Some devices we might
2329 * suspect of doing this but we don't know for certain.
2331 * If we know the reported capacity is wrong, decrement it. If
2332 * we can only guess, then assume the number of blocks is even
2333 * (usually true but not always) and err on the side of lowering
2336 if (sdp->fix_capacity ||
2337 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2338 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2339 "from its reported value: %llu\n",
2340 (unsigned long long) sdkp->capacity);
2345 if (sector_size == 0) {
2347 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2351 if (sector_size != 512 &&
2352 sector_size != 1024 &&
2353 sector_size != 2048 &&
2354 sector_size != 4096) {
2355 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2358 * The user might want to re-format the drive with
2359 * a supported sectorsize. Once this happens, it
2360 * would be relatively trivial to set the thing up.
2361 * For this reason, we leave the thing in the table.
2365 * set a bogus sector size so the normal read/write
2366 * logic in the block layer will eventually refuse any
2367 * request on this device without tripping over power
2368 * of two sector size assumptions
2372 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2373 blk_queue_physical_block_size(sdp->request_queue,
2374 sdkp->physical_block_size);
2375 sdkp->device->sector_size = sector_size;
2377 if (sdkp->capacity > 0xffffffff)
2378 sdp->use_16_for_rw = 1;
2383 * Print disk capacity
2386 sd_print_capacity(struct scsi_disk *sdkp,
2387 sector_t old_capacity)
2389 int sector_size = sdkp->device->sector_size;
2390 char cap_str_2[10], cap_str_10[10];
2392 string_get_size(sdkp->capacity, sector_size,
2393 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2394 string_get_size(sdkp->capacity, sector_size,
2395 STRING_UNITS_10, cap_str_10,
2396 sizeof(cap_str_10));
2398 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2399 sd_printk(KERN_NOTICE, sdkp,
2400 "%llu %d-byte logical blocks: (%s/%s)\n",
2401 (unsigned long long)sdkp->capacity,
2402 sector_size, cap_str_10, cap_str_2);
2404 if (sdkp->physical_block_size != sector_size)
2405 sd_printk(KERN_NOTICE, sdkp,
2406 "%u-byte physical blocks\n",
2407 sdkp->physical_block_size);
2409 sd_zbc_print_zones(sdkp);
2413 /* called with buffer of length 512 */
2415 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2416 unsigned char *buffer, int len, struct scsi_mode_data *data,
2417 struct scsi_sense_hdr *sshdr)
2419 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2420 SD_TIMEOUT, SD_MAX_RETRIES, data,
2425 * read write protect setting, if possible - called only in sd_revalidate_disk()
2426 * called with buffer of length SD_BUF_SIZE
2429 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2432 struct scsi_device *sdp = sdkp->device;
2433 struct scsi_mode_data data;
2434 int old_wp = sdkp->write_prot;
2436 set_disk_ro(sdkp->disk, 0);
2437 if (sdp->skip_ms_page_3f) {
2438 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2442 if (sdp->use_192_bytes_for_3f) {
2443 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2446 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2447 * We have to start carefully: some devices hang if we ask
2448 * for more than is available.
2450 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2453 * Second attempt: ask for page 0 When only page 0 is
2454 * implemented, a request for page 3F may return Sense Key
2455 * 5: Illegal Request, Sense Code 24: Invalid field in
2458 if (!scsi_status_is_good(res))
2459 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2462 * Third attempt: ask 255 bytes, as we did earlier.
2464 if (!scsi_status_is_good(res))
2465 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2469 if (!scsi_status_is_good(res)) {
2470 sd_first_printk(KERN_WARNING, sdkp,
2471 "Test WP failed, assume Write Enabled\n");
2473 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2474 set_disk_ro(sdkp->disk, sdkp->write_prot);
2475 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2476 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2477 sdkp->write_prot ? "on" : "off");
2478 sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2484 * sd_read_cache_type - called only from sd_revalidate_disk()
2485 * called with buffer of length SD_BUF_SIZE
2488 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2491 struct scsi_device *sdp = sdkp->device;
2496 struct scsi_mode_data data;
2497 struct scsi_sense_hdr sshdr;
2498 int old_wce = sdkp->WCE;
2499 int old_rcd = sdkp->RCD;
2500 int old_dpofua = sdkp->DPOFUA;
2503 if (sdkp->cache_override)
2507 if (sdp->skip_ms_page_8) {
2508 if (sdp->type == TYPE_RBC)
2511 if (sdp->skip_ms_page_3f)
2514 if (sdp->use_192_bytes_for_3f)
2518 } else if (sdp->type == TYPE_RBC) {
2526 /* cautiously ask */
2527 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2530 if (!scsi_status_is_good(res))
2533 if (!data.header_length) {
2536 sd_first_printk(KERN_ERR, sdkp,
2537 "Missing header in MODE_SENSE response\n");
2540 /* that went OK, now ask for the proper length */
2544 * We're only interested in the first three bytes, actually.
2545 * But the data cache page is defined for the first 20.
2549 else if (len > SD_BUF_SIZE) {
2550 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2551 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2554 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2558 if (len > first_len)
2559 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2562 if (scsi_status_is_good(res)) {
2563 int offset = data.header_length + data.block_descriptor_length;
2565 while (offset < len) {
2566 u8 page_code = buffer[offset] & 0x3F;
2567 u8 spf = buffer[offset] & 0x40;
2569 if (page_code == 8 || page_code == 6) {
2570 /* We're interested only in the first 3 bytes.
2572 if (len - offset <= 2) {
2573 sd_first_printk(KERN_ERR, sdkp,
2574 "Incomplete mode parameter "
2578 modepage = page_code;
2582 /* Go to the next page */
2583 if (spf && len - offset > 3)
2584 offset += 4 + (buffer[offset+2] << 8) +
2586 else if (!spf && len - offset > 1)
2587 offset += 2 + buffer[offset+1];
2589 sd_first_printk(KERN_ERR, sdkp,
2591 "parameter data\n");
2597 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2601 if (modepage == 8) {
2602 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2603 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2605 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2609 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2610 if (sdp->broken_fua) {
2611 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2613 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2614 !sdkp->device->use_16_for_rw) {
2615 sd_first_printk(KERN_NOTICE, sdkp,
2616 "Uses READ/WRITE(6), disabling FUA\n");
2620 /* No cache flush allowed for write protected devices */
2621 if (sdkp->WCE && sdkp->write_prot)
2624 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2625 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2626 sd_printk(KERN_NOTICE, sdkp,
2627 "Write cache: %s, read cache: %s, %s\n",
2628 sdkp->WCE ? "enabled" : "disabled",
2629 sdkp->RCD ? "disabled" : "enabled",
2630 sdkp->DPOFUA ? "supports DPO and FUA"
2631 : "doesn't support DPO or FUA");
2637 if (scsi_sense_valid(&sshdr) &&
2638 sshdr.sense_key == ILLEGAL_REQUEST &&
2639 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2640 /* Invalid field in CDB */
2641 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2643 sd_first_printk(KERN_ERR, sdkp,
2644 "Asking for cache data failed\n");
2647 if (sdp->wce_default_on) {
2648 sd_first_printk(KERN_NOTICE, sdkp,
2649 "Assuming drive cache: write back\n");
2652 sd_first_printk(KERN_ERR, sdkp,
2653 "Assuming drive cache: write through\n");
2661 * The ATO bit indicates whether the DIF application tag is available
2662 * for use by the operating system.
2664 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2667 struct scsi_device *sdp = sdkp->device;
2668 struct scsi_mode_data data;
2669 struct scsi_sense_hdr sshdr;
2671 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2674 if (sdkp->protection_type == 0)
2677 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2678 SD_MAX_RETRIES, &data, &sshdr);
2680 if (!scsi_status_is_good(res) || !data.header_length ||
2682 sd_first_printk(KERN_WARNING, sdkp,
2683 "getting Control mode page failed, assume no ATO\n");
2685 if (scsi_sense_valid(&sshdr))
2686 sd_print_sense_hdr(sdkp, &sshdr);
2691 offset = data.header_length + data.block_descriptor_length;
2693 if ((buffer[offset] & 0x3f) != 0x0a) {
2694 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2698 if ((buffer[offset + 5] & 0x80) == 0)
2707 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2708 * @disk: disk to query
2710 static void sd_read_block_limits(struct scsi_disk *sdkp)
2712 unsigned int sector_sz = sdkp->device->sector_size;
2713 const int vpd_len = 64;
2714 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2717 /* Block Limits VPD */
2718 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2721 blk_queue_io_min(sdkp->disk->queue,
2722 get_unaligned_be16(&buffer[6]) * sector_sz);
2724 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2725 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2727 if (buffer[3] == 0x3c) {
2728 unsigned int lba_count, desc_count;
2730 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2735 lba_count = get_unaligned_be32(&buffer[20]);
2736 desc_count = get_unaligned_be32(&buffer[24]);
2738 if (lba_count && desc_count)
2739 sdkp->max_unmap_blocks = lba_count;
2741 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2743 if (buffer[32] & 0x80)
2744 sdkp->unmap_alignment =
2745 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2747 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2749 if (sdkp->max_unmap_blocks)
2750 sd_config_discard(sdkp, SD_LBP_UNMAP);
2752 sd_config_discard(sdkp, SD_LBP_WS16);
2754 } else { /* LBP VPD page tells us what to use */
2755 if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
2756 sd_config_discard(sdkp, SD_LBP_UNMAP);
2757 else if (sdkp->lbpws)
2758 sd_config_discard(sdkp, SD_LBP_WS16);
2759 else if (sdkp->lbpws10)
2760 sd_config_discard(sdkp, SD_LBP_WS10);
2761 else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2762 sd_config_discard(sdkp, SD_LBP_UNMAP);
2764 sd_config_discard(sdkp, SD_LBP_DISABLE);
2773 * sd_read_block_characteristics - Query block dev. characteristics
2774 * @disk: disk to query
2776 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2778 struct request_queue *q = sdkp->disk->queue;
2779 unsigned char *buffer;
2781 const int vpd_len = 64;
2783 buffer = kmalloc(vpd_len, GFP_KERNEL);
2786 /* Block Device Characteristics VPD */
2787 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2790 rot = get_unaligned_be16(&buffer[4]);
2793 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, q);
2794 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, q);
2797 if (sdkp->device->type == TYPE_ZBC) {
2799 q->limits.zoned = BLK_ZONED_HM;
2801 sdkp->zoned = (buffer[8] >> 4) & 3;
2802 if (sdkp->zoned == 1)
2804 q->limits.zoned = BLK_ZONED_HA;
2807 * Treat drive-managed devices as
2808 * regular block devices.
2810 q->limits.zoned = BLK_ZONED_NONE;
2812 if (blk_queue_is_zoned(q) && sdkp->first_scan)
2813 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2814 q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2821 * sd_read_block_provisioning - Query provisioning VPD page
2822 * @disk: disk to query
2824 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2826 unsigned char *buffer;
2827 const int vpd_len = 8;
2829 if (sdkp->lbpme == 0)
2832 buffer = kmalloc(vpd_len, GFP_KERNEL);
2834 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2838 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2839 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2840 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2846 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2848 struct scsi_device *sdev = sdkp->device;
2850 if (sdev->host->no_write_same) {
2851 sdev->no_write_same = 1;
2856 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2857 /* too large values might cause issues with arcmsr */
2858 int vpd_buf_len = 64;
2860 sdev->no_report_opcodes = 1;
2862 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2863 * CODES is unsupported and the device has an ATA
2864 * Information VPD page (SAT).
2866 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2867 sdev->no_write_same = 1;
2870 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2873 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2878 * sd_revalidate_disk - called the first time a new disk is seen,
2879 * performs disk spin up, read_capacity, etc.
2880 * @disk: struct gendisk we care about
2882 static int sd_revalidate_disk(struct gendisk *disk)
2884 struct scsi_disk *sdkp = scsi_disk(disk);
2885 struct scsi_device *sdp = sdkp->device;
2886 struct request_queue *q = sdkp->disk->queue;
2887 sector_t old_capacity = sdkp->capacity;
2888 unsigned char *buffer;
2889 unsigned int dev_max, rw_max;
2891 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2892 "sd_revalidate_disk\n"));
2895 * If the device is offline, don't try and read capacity or any
2896 * of the other niceties.
2898 if (!scsi_device_online(sdp))
2901 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2903 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2904 "allocation failure.\n");
2908 sd_spinup_disk(sdkp);
2911 * Without media there is no reason to ask; moreover, some devices
2912 * react badly if we do.
2914 if (sdkp->media_present) {
2915 sd_read_capacity(sdkp, buffer);
2917 if (scsi_device_supports_vpd(sdp)) {
2918 sd_read_block_provisioning(sdkp);
2919 sd_read_block_limits(sdkp);
2920 sd_read_block_characteristics(sdkp);
2921 sd_zbc_read_zones(sdkp, buffer);
2924 sd_print_capacity(sdkp, old_capacity);
2926 sd_read_write_protect_flag(sdkp, buffer);
2927 sd_read_cache_type(sdkp, buffer);
2928 sd_read_app_tag_own(sdkp, buffer);
2929 sd_read_write_same(sdkp, buffer);
2932 sdkp->first_scan = 0;
2935 * We now have all cache related info, determine how we deal
2936 * with flush requests.
2938 sd_set_flush_flag(sdkp);
2940 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2941 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
2943 /* Some devices report a maximum block count for READ/WRITE requests. */
2944 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
2945 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
2948 * Use the device's preferred I/O size for reads and writes
2949 * unless the reported value is unreasonably small, large, or
2952 if (sdkp->opt_xfer_blocks &&
2953 sdkp->opt_xfer_blocks <= dev_max &&
2954 sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
2955 logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
2956 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
2957 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
2959 rw_max = BLK_DEF_MAX_SECTORS;
2961 /* Combine with controller limits */
2962 q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
2964 set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
2965 sd_config_write_same(sdkp);
2973 * sd_unlock_native_capacity - unlock native capacity
2974 * @disk: struct gendisk to set capacity for
2976 * Block layer calls this function if it detects that partitions
2977 * on @disk reach beyond the end of the device. If the SCSI host
2978 * implements ->unlock_native_capacity() method, it's invoked to
2979 * give it a chance to adjust the device capacity.
2982 * Defined by block layer. Might sleep.
2984 static void sd_unlock_native_capacity(struct gendisk *disk)
2986 struct scsi_device *sdev = scsi_disk(disk)->device;
2988 if (sdev->host->hostt->unlock_native_capacity)
2989 sdev->host->hostt->unlock_native_capacity(sdev);
2993 * sd_format_disk_name - format disk name
2994 * @prefix: name prefix - ie. "sd" for SCSI disks
2995 * @index: index of the disk to format name for
2996 * @buf: output buffer
2997 * @buflen: length of the output buffer
2999 * SCSI disk names starts at sda. The 26th device is sdz and the
3000 * 27th is sdaa. The last one for two lettered suffix is sdzz
3001 * which is followed by sdaaa.
3003 * This is basically 26 base counting with one extra 'nil' entry
3004 * at the beginning from the second digit on and can be
3005 * determined using similar method as 26 base conversion with the
3006 * index shifted -1 after each digit is computed.
3012 * 0 on success, -errno on failure.
3014 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3016 const int base = 'z' - 'a' + 1;
3017 char *begin = buf + strlen(prefix);
3018 char *end = buf + buflen;
3028 *--p = 'a' + (index % unit);
3029 index = (index / unit) - 1;
3030 } while (index >= 0);
3032 memmove(begin, p, end - p);
3033 memcpy(buf, prefix, strlen(prefix));
3039 * The asynchronous part of sd_probe
3041 static void sd_probe_async(void *data, async_cookie_t cookie)
3043 struct scsi_disk *sdkp = data;
3044 struct scsi_device *sdp;
3051 index = sdkp->index;
3052 dev = &sdp->sdev_gendev;
3054 gd->major = sd_major((index & 0xf0) >> 4);
3055 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3056 gd->minors = SD_MINORS;
3058 gd->fops = &sd_fops;
3059 gd->private_data = &sdkp->driver;
3060 gd->queue = sdkp->device->request_queue;
3062 /* defaults, until the device tells us otherwise */
3063 sdp->sector_size = 512;
3065 sdkp->media_present = 1;
3066 sdkp->write_prot = 0;
3067 sdkp->cache_override = 0;
3071 sdkp->first_scan = 1;
3072 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3074 sd_revalidate_disk(gd);
3076 gd->flags = GENHD_FL_EXT_DEVT;
3077 if (sdp->removable) {
3078 gd->flags |= GENHD_FL_REMOVABLE;
3079 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3082 blk_pm_runtime_init(sdp->request_queue, dev);
3083 device_add_disk(dev, gd);
3085 sd_dif_config_host(sdkp);
3087 sd_revalidate_disk(gd);
3089 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3090 sdp->removable ? "removable " : "");
3091 scsi_autopm_put_device(sdp);
3092 put_device(&sdkp->dev);
3096 * sd_probe - called during driver initialization and whenever a
3097 * new scsi device is attached to the system. It is called once
3098 * for each scsi device (not just disks) present.
3099 * @dev: pointer to device object
3101 * Returns 0 if successful (or not interested in this scsi device
3102 * (e.g. scanner)); 1 when there is an error.
3104 * Note: this function is invoked from the scsi mid-level.
3105 * This function sets up the mapping between a given
3106 * <host,channel,id,lun> (found in sdp) and new device name
3107 * (e.g. /dev/sda). More precisely it is the block device major
3108 * and minor number that is chosen here.
3110 * Assume sd_probe is not re-entrant (for time being)
3111 * Also think about sd_probe() and sd_remove() running coincidentally.
3113 static int sd_probe(struct device *dev)
3115 struct scsi_device *sdp = to_scsi_device(dev);
3116 struct scsi_disk *sdkp;
3121 scsi_autopm_get_device(sdp);
3123 if (sdp->type != TYPE_DISK &&
3124 sdp->type != TYPE_ZBC &&
3125 sdp->type != TYPE_MOD &&
3126 sdp->type != TYPE_RBC)
3129 #ifndef CONFIG_BLK_DEV_ZONED
3130 if (sdp->type == TYPE_ZBC)
3133 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3137 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3141 gd = alloc_disk(SD_MINORS);
3146 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3149 spin_lock(&sd_index_lock);
3150 error = ida_get_new(&sd_index_ida, &index);
3151 spin_unlock(&sd_index_lock);
3152 } while (error == -EAGAIN);
3155 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3159 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3161 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3162 goto out_free_index;
3166 sdkp->driver = &sd_template;
3168 sdkp->index = index;
3169 atomic_set(&sdkp->openers, 0);
3170 atomic_set(&sdkp->device->ioerr_cnt, 0);
3172 if (!sdp->request_queue->rq_timeout) {
3173 if (sdp->type != TYPE_MOD)
3174 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3176 blk_queue_rq_timeout(sdp->request_queue,
3180 device_initialize(&sdkp->dev);
3181 sdkp->dev.parent = dev;
3182 sdkp->dev.class = &sd_disk_class;
3183 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3185 error = device_add(&sdkp->dev);
3187 goto out_free_index;
3190 dev_set_drvdata(dev, sdkp);
3192 get_device(&sdkp->dev); /* prevent release before async_schedule */
3193 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3198 spin_lock(&sd_index_lock);
3199 ida_remove(&sd_index_ida, index);
3200 spin_unlock(&sd_index_lock);
3206 scsi_autopm_put_device(sdp);
3211 * sd_remove - called whenever a scsi disk (previously recognized by
3212 * sd_probe) is detached from the system. It is called (potentially
3213 * multiple times) during sd module unload.
3214 * @dev: pointer to device object
3216 * Note: this function is invoked from the scsi mid-level.
3217 * This function potentially frees up a device name (e.g. /dev/sdc)
3218 * that could be re-used by a subsequent sd_probe().
3219 * This function is not called when the built-in sd driver is "exit-ed".
3221 static int sd_remove(struct device *dev)
3223 struct scsi_disk *sdkp;
3226 sdkp = dev_get_drvdata(dev);
3227 devt = disk_devt(sdkp->disk);
3228 scsi_autopm_get_device(sdkp->device);
3230 async_synchronize_full_domain(&scsi_sd_pm_domain);
3231 async_synchronize_full_domain(&scsi_sd_probe_domain);
3232 device_del(&sdkp->dev);
3233 del_gendisk(sdkp->disk);
3236 sd_zbc_remove(sdkp);
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;
3263 spin_lock(&sd_index_lock);
3264 ida_remove(&sd_index_ida, sdkp->index);
3265 spin_unlock(&sd_index_lock);
3267 disk->private_data = NULL;
3269 put_device(&sdkp->device->sdev_gendev);
3274 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3276 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3277 struct scsi_sense_hdr sshdr;
3278 struct scsi_device *sdp = sdkp->device;
3282 cmd[4] |= 1; /* START */
3284 if (sdp->start_stop_pwr_cond)
3285 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3287 if (!scsi_device_online(sdp))
3290 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3291 SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3293 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3294 if (driver_byte(res) & DRIVER_SENSE)
3295 sd_print_sense_hdr(sdkp, &sshdr);
3296 if (scsi_sense_valid(&sshdr) &&
3297 /* 0x3a is medium not present */
3302 /* SCSI error codes must not go to the generic layer */
3310 * Send a SYNCHRONIZE CACHE instruction down to the device through
3311 * the normal SCSI command structure. Wait for the command to
3314 static void sd_shutdown(struct device *dev)
3316 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3319 return; /* this can happen */
3321 if (pm_runtime_suspended(dev))
3324 if (sdkp->WCE && sdkp->media_present) {
3325 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3326 sd_sync_cache(sdkp);
3329 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3330 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3331 sd_start_stop_device(sdkp, 0);
3335 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3337 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3340 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3343 if (sdkp->WCE && sdkp->media_present) {
3344 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3345 ret = sd_sync_cache(sdkp);
3347 /* ignore OFFLINE device */
3354 if (sdkp->device->manage_start_stop) {
3355 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3356 /* an error is not worth aborting a system sleep */
3357 ret = sd_start_stop_device(sdkp, 0);
3358 if (ignore_stop_errors)
3366 static int sd_suspend_system(struct device *dev)
3368 return sd_suspend_common(dev, true);
3371 static int sd_suspend_runtime(struct device *dev)
3373 return sd_suspend_common(dev, false);
3376 static int sd_resume(struct device *dev)
3378 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3380 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3383 if (!sdkp->device->manage_start_stop)
3386 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3387 return sd_start_stop_device(sdkp, 1);
3391 * init_sd - entry point for this driver (both when built in or when
3394 * Note: this function registers this driver with the scsi mid-level.
3396 static int __init init_sd(void)
3398 int majors = 0, i, err;
3400 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3402 for (i = 0; i < SD_MAJORS; i++) {
3403 if (register_blkdev(sd_major(i), "sd") != 0)
3406 blk_register_region(sd_major(i), SD_MINORS, NULL,
3407 sd_default_probe, NULL, NULL);
3413 err = class_register(&sd_disk_class);
3417 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3419 if (!sd_cdb_cache) {
3420 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3425 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3427 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3432 err = scsi_register_driver(&sd_template.gendrv);
3434 goto err_out_driver;
3439 mempool_destroy(sd_cdb_pool);
3442 kmem_cache_destroy(sd_cdb_cache);
3445 class_unregister(&sd_disk_class);
3447 for (i = 0; i < SD_MAJORS; i++)
3448 unregister_blkdev(sd_major(i), "sd");
3453 * exit_sd - exit point for this driver (when it is a module).
3455 * Note: this function unregisters this driver from the scsi mid-level.
3457 static void __exit exit_sd(void)
3461 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3463 scsi_unregister_driver(&sd_template.gendrv);
3464 mempool_destroy(sd_cdb_pool);
3465 kmem_cache_destroy(sd_cdb_cache);
3467 class_unregister(&sd_disk_class);
3469 for (i = 0; i < SD_MAJORS; i++) {
3470 blk_unregister_region(sd_major(i), SD_MINORS);
3471 unregister_blkdev(sd_major(i), "sd");
3475 module_init(init_sd);
3476 module_exit(exit_sd);
3478 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3479 struct scsi_sense_hdr *sshdr)
3481 scsi_print_sense_hdr(sdkp->device,
3482 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3485 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3488 const char *hb_string = scsi_hostbyte_string(result);
3489 const char *db_string = scsi_driverbyte_string(result);
3491 if (hb_string || db_string)
3492 sd_printk(KERN_INFO, sdkp,
3493 "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3494 hb_string ? hb_string : "invalid",
3495 db_string ? db_string : "invalid");
3497 sd_printk(KERN_INFO, sdkp,
3498 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3499 msg, host_byte(result), driver_byte(result));