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 <asm/uaccess.h>
56 #include <asm/unaligned.h>
58 #include <scsi/scsi.h>
59 #include <scsi/scsi_cmnd.h>
60 #include <scsi/scsi_dbg.h>
61 #include <scsi/scsi_device.h>
62 #include <scsi/scsi_driver.h>
63 #include <scsi/scsi_eh.h>
64 #include <scsi/scsi_host.h>
65 #include <scsi/scsi_ioctl.h>
66 #include <scsi/scsicam.h>
69 #include "scsi_priv.h"
70 #include "scsi_logging.h"
72 MODULE_AUTHOR("Eric Youngdale");
73 MODULE_DESCRIPTION("SCSI disk (sd) driver");
74 MODULE_LICENSE("GPL");
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
91 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
94 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
96 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
102 static void sd_config_discard(struct scsi_disk *, unsigned int);
103 static void sd_config_write_same(struct scsi_disk *);
104 static int sd_revalidate_disk(struct gendisk *);
105 static void sd_unlock_native_capacity(struct gendisk *disk);
106 static int sd_probe(struct device *);
107 static int sd_remove(struct device *);
108 static void sd_shutdown(struct device *);
109 static int sd_suspend_system(struct device *);
110 static int sd_suspend_runtime(struct device *);
111 static int sd_resume(struct device *);
112 static void sd_rescan(struct device *);
113 static int sd_init_command(struct scsi_cmnd *SCpnt);
114 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
115 static int sd_done(struct scsi_cmnd *);
116 static int sd_eh_action(struct scsi_cmnd *, int);
117 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
118 static void scsi_disk_release(struct device *cdev);
119 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
120 static void sd_print_result(const struct scsi_disk *, const char *, int);
122 static DEFINE_SPINLOCK(sd_index_lock);
123 static DEFINE_IDA(sd_index_ida);
125 /* This semaphore is used to mediate the 0->1 reference get in the
126 * face of object destruction (i.e. we can't allow a get on an
127 * object after last put) */
128 static DEFINE_MUTEX(sd_ref_mutex);
130 static struct kmem_cache *sd_cdb_cache;
131 static mempool_t *sd_cdb_pool;
133 static const char *sd_cache_types[] = {
134 "write through", "none", "write back",
135 "write back, no read (daft)"
138 static void sd_set_flush_flag(struct scsi_disk *sdkp)
148 blk_queue_flush(sdkp->disk->queue, flush);
152 cache_type_store(struct device *dev, struct device_attribute *attr,
153 const char *buf, size_t count)
155 int i, ct = -1, rcd, wce, sp;
156 struct scsi_disk *sdkp = to_scsi_disk(dev);
157 struct scsi_device *sdp = sdkp->device;
160 struct scsi_mode_data data;
161 struct scsi_sense_hdr sshdr;
162 static const char temp[] = "temporary ";
165 if (sdp->type != TYPE_DISK)
166 /* no cache control on RBC devices; theoretically they
167 * can do it, but there's probably so many exceptions
168 * it's not worth the risk */
171 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
172 buf += sizeof(temp) - 1;
173 sdkp->cache_override = 1;
175 sdkp->cache_override = 0;
178 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
179 len = strlen(sd_cache_types[i]);
180 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
188 rcd = ct & 0x01 ? 1 : 0;
189 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
191 if (sdkp->cache_override) {
194 sd_set_flush_flag(sdkp);
198 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
199 SD_MAX_RETRIES, &data, NULL))
201 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
202 data.block_descriptor_length);
203 buffer_data = buffer + data.header_length +
204 data.block_descriptor_length;
205 buffer_data[2] &= ~0x05;
206 buffer_data[2] |= wce << 2 | rcd;
207 sp = buffer_data[0] & 0x80 ? 1 : 0;
208 buffer_data[0] &= ~0x80;
210 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
211 SD_MAX_RETRIES, &data, &sshdr)) {
212 if (scsi_sense_valid(&sshdr))
213 sd_print_sense_hdr(sdkp, &sshdr);
216 revalidate_disk(sdkp->disk);
221 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
224 struct scsi_disk *sdkp = to_scsi_disk(dev);
225 struct scsi_device *sdp = sdkp->device;
227 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
231 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
232 const char *buf, size_t count)
234 struct scsi_disk *sdkp = to_scsi_disk(dev);
235 struct scsi_device *sdp = sdkp->device;
237 if (!capable(CAP_SYS_ADMIN))
240 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
244 static DEVICE_ATTR_RW(manage_start_stop);
247 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
249 struct scsi_disk *sdkp = to_scsi_disk(dev);
251 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
255 allow_restart_store(struct device *dev, struct device_attribute *attr,
256 const char *buf, size_t count)
258 struct scsi_disk *sdkp = to_scsi_disk(dev);
259 struct scsi_device *sdp = sdkp->device;
261 if (!capable(CAP_SYS_ADMIN))
264 if (sdp->type != TYPE_DISK)
267 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
271 static DEVICE_ATTR_RW(allow_restart);
274 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
276 struct scsi_disk *sdkp = to_scsi_disk(dev);
277 int ct = sdkp->RCD + 2*sdkp->WCE;
279 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
281 static DEVICE_ATTR_RW(cache_type);
284 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
286 struct scsi_disk *sdkp = to_scsi_disk(dev);
288 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
290 static DEVICE_ATTR_RO(FUA);
293 protection_type_show(struct device *dev, struct device_attribute *attr,
296 struct scsi_disk *sdkp = to_scsi_disk(dev);
298 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
302 protection_type_store(struct device *dev, struct device_attribute *attr,
303 const char *buf, size_t count)
305 struct scsi_disk *sdkp = to_scsi_disk(dev);
309 if (!capable(CAP_SYS_ADMIN))
312 err = kstrtouint(buf, 10, &val);
317 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
318 sdkp->protection_type = val;
322 static DEVICE_ATTR_RW(protection_type);
325 protection_mode_show(struct device *dev, struct device_attribute *attr,
328 struct scsi_disk *sdkp = to_scsi_disk(dev);
329 struct scsi_device *sdp = sdkp->device;
330 unsigned int dif, dix;
332 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
333 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
335 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
341 return snprintf(buf, 20, "none\n");
343 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
345 static DEVICE_ATTR_RO(protection_mode);
348 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
350 struct scsi_disk *sdkp = to_scsi_disk(dev);
352 return snprintf(buf, 20, "%u\n", sdkp->ATO);
354 static DEVICE_ATTR_RO(app_tag_own);
357 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
360 struct scsi_disk *sdkp = to_scsi_disk(dev);
362 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
364 static DEVICE_ATTR_RO(thin_provisioning);
366 static const char *lbp_mode[] = {
367 [SD_LBP_FULL] = "full",
368 [SD_LBP_UNMAP] = "unmap",
369 [SD_LBP_WS16] = "writesame_16",
370 [SD_LBP_WS10] = "writesame_10",
371 [SD_LBP_ZERO] = "writesame_zero",
372 [SD_LBP_DISABLE] = "disabled",
376 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
379 struct scsi_disk *sdkp = to_scsi_disk(dev);
381 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
385 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
386 const char *buf, size_t count)
388 struct scsi_disk *sdkp = to_scsi_disk(dev);
389 struct scsi_device *sdp = sdkp->device;
391 if (!capable(CAP_SYS_ADMIN))
394 if (sdp->type != TYPE_DISK)
397 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
398 sd_config_discard(sdkp, SD_LBP_UNMAP);
399 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
400 sd_config_discard(sdkp, SD_LBP_WS16);
401 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
402 sd_config_discard(sdkp, SD_LBP_WS10);
403 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
404 sd_config_discard(sdkp, SD_LBP_ZERO);
405 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
406 sd_config_discard(sdkp, SD_LBP_DISABLE);
412 static DEVICE_ATTR_RW(provisioning_mode);
415 max_medium_access_timeouts_show(struct device *dev,
416 struct device_attribute *attr, char *buf)
418 struct scsi_disk *sdkp = to_scsi_disk(dev);
420 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
424 max_medium_access_timeouts_store(struct device *dev,
425 struct device_attribute *attr, const char *buf,
428 struct scsi_disk *sdkp = to_scsi_disk(dev);
431 if (!capable(CAP_SYS_ADMIN))
434 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
436 return err ? err : count;
438 static DEVICE_ATTR_RW(max_medium_access_timeouts);
441 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
444 struct scsi_disk *sdkp = to_scsi_disk(dev);
446 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
450 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
451 const char *buf, size_t count)
453 struct scsi_disk *sdkp = to_scsi_disk(dev);
454 struct scsi_device *sdp = sdkp->device;
458 if (!capable(CAP_SYS_ADMIN))
461 if (sdp->type != TYPE_DISK)
464 err = kstrtoul(buf, 10, &max);
470 sdp->no_write_same = 1;
471 else if (max <= SD_MAX_WS16_BLOCKS) {
472 sdp->no_write_same = 0;
473 sdkp->max_ws_blocks = max;
476 sd_config_write_same(sdkp);
480 static DEVICE_ATTR_RW(max_write_same_blocks);
482 static struct attribute *sd_disk_attrs[] = {
483 &dev_attr_cache_type.attr,
485 &dev_attr_allow_restart.attr,
486 &dev_attr_manage_start_stop.attr,
487 &dev_attr_protection_type.attr,
488 &dev_attr_protection_mode.attr,
489 &dev_attr_app_tag_own.attr,
490 &dev_attr_thin_provisioning.attr,
491 &dev_attr_provisioning_mode.attr,
492 &dev_attr_max_write_same_blocks.attr,
493 &dev_attr_max_medium_access_timeouts.attr,
496 ATTRIBUTE_GROUPS(sd_disk);
498 static struct class sd_disk_class = {
500 .owner = THIS_MODULE,
501 .dev_release = scsi_disk_release,
502 .dev_groups = sd_disk_groups,
505 static const struct dev_pm_ops sd_pm_ops = {
506 .suspend = sd_suspend_system,
508 .poweroff = sd_suspend_system,
509 .restore = sd_resume,
510 .runtime_suspend = sd_suspend_runtime,
511 .runtime_resume = sd_resume,
514 static struct scsi_driver sd_template = {
517 .owner = THIS_MODULE,
520 .shutdown = sd_shutdown,
524 .init_command = sd_init_command,
525 .uninit_command = sd_uninit_command,
527 .eh_action = sd_eh_action,
531 * Dummy kobj_map->probe function.
532 * The default ->probe function will call modprobe, which is
533 * pointless as this module is already loaded.
535 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
541 * Device no to disk mapping:
543 * major disc2 disc p1
544 * |............|.............|....|....| <- dev_t
547 * Inside a major, we have 16k disks, however mapped non-
548 * contiguously. The first 16 disks are for major0, the next
549 * ones with major1, ... Disk 256 is for major0 again, disk 272
551 * As we stay compatible with our numbering scheme, we can reuse
552 * the well-know SCSI majors 8, 65--71, 136--143.
554 static int sd_major(int major_idx)
558 return SCSI_DISK0_MAJOR;
560 return SCSI_DISK1_MAJOR + major_idx - 1;
562 return SCSI_DISK8_MAJOR + major_idx - 8;
565 return 0; /* shut up gcc */
569 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
571 struct scsi_disk *sdkp = NULL;
573 mutex_lock(&sd_ref_mutex);
575 if (disk->private_data) {
576 sdkp = scsi_disk(disk);
577 if (scsi_device_get(sdkp->device) == 0)
578 get_device(&sdkp->dev);
582 mutex_unlock(&sd_ref_mutex);
586 static void scsi_disk_put(struct scsi_disk *sdkp)
588 struct scsi_device *sdev = sdkp->device;
590 mutex_lock(&sd_ref_mutex);
591 put_device(&sdkp->dev);
592 scsi_device_put(sdev);
593 mutex_unlock(&sd_ref_mutex);
596 static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
597 unsigned int dix, unsigned int dif)
599 struct bio *bio = scmd->request->bio;
600 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
601 unsigned int protect = 0;
603 if (dix) { /* DIX Type 0, 1, 2, 3 */
604 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
605 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
607 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
608 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
611 if (dif != SD_DIF_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
612 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
614 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
615 scmd->prot_flags |= SCSI_PROT_REF_CHECK;
618 if (dif) { /* DIX/DIF Type 1, 2, 3 */
619 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
621 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
622 protect = 3 << 5; /* Disable target PI checking */
624 protect = 1 << 5; /* Enable target PI checking */
627 scsi_set_prot_op(scmd, prot_op);
628 scsi_set_prot_type(scmd, dif);
629 scmd->prot_flags &= sd_prot_flag_mask(prot_op);
634 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
636 struct request_queue *q = sdkp->disk->queue;
637 unsigned int logical_block_size = sdkp->device->sector_size;
638 unsigned int max_blocks = 0;
640 q->limits.discard_zeroes_data = 0;
643 * When LBPRZ is reported, discard alignment and granularity
644 * must be fixed to the logical block size. Otherwise the block
645 * layer will drop misaligned portions of the request which can
646 * lead to data corruption. If LBPRZ is not set, we honor the
650 q->limits.discard_alignment = 0;
651 q->limits.discard_granularity = logical_block_size;
653 q->limits.discard_alignment = sdkp->unmap_alignment *
655 q->limits.discard_granularity =
656 max(sdkp->physical_block_size,
657 sdkp->unmap_granularity * logical_block_size);
660 sdkp->provisioning_mode = mode;
665 blk_queue_max_discard_sectors(q, 0);
666 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
670 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
671 (u32)SD_MAX_WS16_BLOCKS);
675 max_blocks = min_not_zero(sdkp->max_ws_blocks,
676 (u32)SD_MAX_WS16_BLOCKS);
677 q->limits.discard_zeroes_data = sdkp->lbprz;
681 max_blocks = min_not_zero(sdkp->max_ws_blocks,
682 (u32)SD_MAX_WS10_BLOCKS);
683 q->limits.discard_zeroes_data = sdkp->lbprz;
687 max_blocks = min_not_zero(sdkp->max_ws_blocks,
688 (u32)SD_MAX_WS10_BLOCKS);
689 q->limits.discard_zeroes_data = 1;
693 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
694 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
698 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
699 * @sdp: scsi device to operate one
700 * @rq: Request to prepare
702 * Will issue either UNMAP or WRITE SAME(16) depending on preference
703 * indicated by target device.
705 static int sd_setup_discard_cmnd(struct scsi_cmnd *cmd)
707 struct request *rq = cmd->request;
708 struct scsi_device *sdp = cmd->device;
709 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
710 sector_t sector = blk_rq_pos(rq);
711 unsigned int nr_sectors = blk_rq_sectors(rq);
712 unsigned int nr_bytes = blk_rq_bytes(rq);
718 sector >>= ilog2(sdp->sector_size) - 9;
719 nr_sectors >>= ilog2(sdp->sector_size) - 9;
721 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
723 return BLKPREP_DEFER;
725 switch (sdkp->provisioning_mode) {
727 buf = page_address(page);
730 cmd->cmnd[0] = UNMAP;
733 put_unaligned_be16(6 + 16, &buf[0]);
734 put_unaligned_be16(16, &buf[2]);
735 put_unaligned_be64(sector, &buf[8]);
736 put_unaligned_be32(nr_sectors, &buf[16]);
743 cmd->cmnd[0] = WRITE_SAME_16;
744 cmd->cmnd[1] = 0x8; /* UNMAP */
745 put_unaligned_be64(sector, &cmd->cmnd[2]);
746 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
748 len = sdkp->device->sector_size;
754 cmd->cmnd[0] = WRITE_SAME;
755 if (sdkp->provisioning_mode == SD_LBP_WS10)
756 cmd->cmnd[1] = 0x8; /* UNMAP */
757 put_unaligned_be32(sector, &cmd->cmnd[2]);
758 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
760 len = sdkp->device->sector_size;
768 rq->completion_data = page;
769 rq->timeout = SD_TIMEOUT;
771 cmd->transfersize = len;
772 cmd->allowed = SD_MAX_RETRIES;
775 * Initially __data_len is set to the amount of data that needs to be
776 * transferred to the target. This amount depends on whether WRITE SAME
777 * or UNMAP is being used. After the scatterlist has been mapped by
778 * scsi_init_io() we set __data_len to the size of the area to be
779 * discarded on disk. This allows us to report completion on the full
780 * amount of blocks described by the request.
782 blk_add_request_payload(rq, page, len);
783 ret = scsi_init_io(cmd);
784 rq->__data_len = nr_bytes;
787 if (ret != BLKPREP_OK)
792 static void sd_config_write_same(struct scsi_disk *sdkp)
794 struct request_queue *q = sdkp->disk->queue;
795 unsigned int logical_block_size = sdkp->device->sector_size;
797 if (sdkp->device->no_write_same) {
798 sdkp->max_ws_blocks = 0;
802 /* Some devices can not handle block counts above 0xffff despite
803 * supporting WRITE SAME(16). Consequently we default to 64k
804 * blocks per I/O unless the device explicitly advertises a
807 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
808 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
809 (u32)SD_MAX_WS16_BLOCKS);
810 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
811 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
812 (u32)SD_MAX_WS10_BLOCKS);
814 sdkp->device->no_write_same = 1;
815 sdkp->max_ws_blocks = 0;
819 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
820 (logical_block_size >> 9));
824 * sd_setup_write_same_cmnd - write the same data to multiple blocks
825 * @cmd: command to prepare
827 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
828 * preference indicated by target device.
830 static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
832 struct request *rq = cmd->request;
833 struct scsi_device *sdp = cmd->device;
834 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
835 struct bio *bio = rq->bio;
836 sector_t sector = blk_rq_pos(rq);
837 unsigned int nr_sectors = blk_rq_sectors(rq);
838 unsigned int nr_bytes = blk_rq_bytes(rq);
841 if (sdkp->device->no_write_same)
844 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
846 sector >>= ilog2(sdp->sector_size) - 9;
847 nr_sectors >>= ilog2(sdp->sector_size) - 9;
849 rq->timeout = SD_WRITE_SAME_TIMEOUT;
851 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
853 cmd->cmnd[0] = WRITE_SAME_16;
854 put_unaligned_be64(sector, &cmd->cmnd[2]);
855 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
858 cmd->cmnd[0] = WRITE_SAME;
859 put_unaligned_be32(sector, &cmd->cmnd[2]);
860 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
863 cmd->transfersize = sdp->sector_size;
864 cmd->allowed = SD_MAX_RETRIES;
867 * For WRITE_SAME the data transferred in the DATA IN buffer is
868 * different from the amount of data actually written to the target.
870 * We set up __data_len to the amount of data transferred from the
871 * DATA IN buffer so that blk_rq_map_sg set up the proper S/G list
872 * to transfer a single sector of data first, but then reset it to
873 * the amount of data to be written right after so that the I/O path
874 * knows how much to actually write.
876 rq->__data_len = sdp->sector_size;
877 ret = scsi_init_io(cmd);
878 rq->__data_len = nr_bytes;
882 static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
884 struct request *rq = cmd->request;
886 /* flush requests don't perform I/O, zero the S/G table */
887 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
889 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
891 cmd->transfersize = 0;
892 cmd->allowed = SD_MAX_RETRIES;
894 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
898 static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
900 struct request *rq = SCpnt->request;
901 struct scsi_device *sdp = SCpnt->device;
902 struct gendisk *disk = rq->rq_disk;
903 struct scsi_disk *sdkp;
904 sector_t block = blk_rq_pos(rq);
906 unsigned int this_count = blk_rq_sectors(rq);
907 unsigned int dif, dix;
909 unsigned char protect;
911 ret = scsi_init_io(SCpnt);
912 if (ret != BLKPREP_OK)
915 sdkp = scsi_disk(disk);
917 /* from here on until we're complete, any goto out
918 * is used for a killable error condition */
922 scmd_printk(KERN_INFO, SCpnt,
923 "%s: block=%llu, count=%d\n",
924 __func__, (unsigned long long)block, this_count));
926 if (!sdp || !scsi_device_online(sdp) ||
927 block + blk_rq_sectors(rq) > get_capacity(disk)) {
928 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
929 "Finishing %u sectors\n",
930 blk_rq_sectors(rq)));
931 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
932 "Retry with 0x%p\n", SCpnt));
938 * quietly refuse to do anything to a changed disc until
939 * the changed bit has been reset
941 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
946 * Some SD card readers can't handle multi-sector accesses which touch
947 * the last one or two hardware sectors. Split accesses as needed.
949 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
950 (sdp->sector_size / 512);
952 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
953 if (block < threshold) {
954 /* Access up to the threshold but not beyond */
955 this_count = threshold - block;
957 /* Access only a single hardware sector */
958 this_count = sdp->sector_size / 512;
962 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
963 (unsigned long long)block));
966 * If we have a 1K hardware sectorsize, prevent access to single
967 * 512 byte sectors. In theory we could handle this - in fact
968 * the scsi cdrom driver must be able to handle this because
969 * we typically use 1K blocksizes, and cdroms typically have
970 * 2K hardware sectorsizes. Of course, things are simpler
971 * with the cdrom, since it is read-only. For performance
972 * reasons, the filesystems should be able to handle this
973 * and not force the scsi disk driver to use bounce buffers
976 if (sdp->sector_size == 1024) {
977 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
978 scmd_printk(KERN_ERR, SCpnt,
979 "Bad block number requested\n");
983 this_count = this_count >> 1;
986 if (sdp->sector_size == 2048) {
987 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
988 scmd_printk(KERN_ERR, SCpnt,
989 "Bad block number requested\n");
993 this_count = this_count >> 2;
996 if (sdp->sector_size == 4096) {
997 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
998 scmd_printk(KERN_ERR, SCpnt,
999 "Bad block number requested\n");
1003 this_count = this_count >> 3;
1006 if (rq_data_dir(rq) == WRITE) {
1007 SCpnt->cmnd[0] = WRITE_6;
1009 if (blk_integrity_rq(rq))
1010 sd_dif_prepare(SCpnt);
1012 } else if (rq_data_dir(rq) == READ) {
1013 SCpnt->cmnd[0] = READ_6;
1015 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
1019 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1020 "%s %d/%u 512 byte blocks.\n",
1021 (rq_data_dir(rq) == WRITE) ?
1022 "writing" : "reading", this_count,
1023 blk_rq_sectors(rq)));
1025 dix = scsi_prot_sg_count(SCpnt);
1026 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1029 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1033 if (protect && sdkp->protection_type == SD_DIF_TYPE2_PROTECTION) {
1034 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1036 if (unlikely(SCpnt->cmnd == NULL)) {
1037 ret = BLKPREP_DEFER;
1041 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1042 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1043 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1044 SCpnt->cmnd[7] = 0x18;
1045 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1046 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1049 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1050 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1051 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1052 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1053 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1054 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1055 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1056 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1058 /* Expected Indirect LBA */
1059 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1060 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1061 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1062 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1064 /* Transfer length */
1065 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1066 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1067 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1068 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1069 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1070 SCpnt->cmnd[0] += READ_16 - READ_6;
1071 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1072 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1073 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1074 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1075 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1076 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1077 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1078 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1079 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1080 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1081 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1082 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1083 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1084 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1085 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1086 scsi_device_protection(SCpnt->device) ||
1087 SCpnt->device->use_10_for_rw) {
1088 SCpnt->cmnd[0] += READ_10 - READ_6;
1089 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1090 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1091 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1092 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1093 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1094 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1095 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1096 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1098 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1100 * This happens only if this drive failed
1101 * 10byte rw command with ILLEGAL_REQUEST
1102 * during operation and thus turned off
1105 scmd_printk(KERN_ERR, SCpnt,
1106 "FUA write on READ/WRITE(6) drive\n");
1110 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1111 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1112 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1113 SCpnt->cmnd[4] = (unsigned char) this_count;
1116 SCpnt->sdb.length = this_count * sdp->sector_size;
1119 * We shouldn't disconnect in the middle of a sector, so with a dumb
1120 * host adapter, it's safe to assume that we can at least transfer
1121 * this many bytes between each connect / disconnect.
1123 SCpnt->transfersize = sdp->sector_size;
1124 SCpnt->underflow = this_count << 9;
1125 SCpnt->allowed = SD_MAX_RETRIES;
1128 * This indicates that the command is ready from our end to be
1136 static int sd_init_command(struct scsi_cmnd *cmd)
1138 struct request *rq = cmd->request;
1140 if (rq->cmd_flags & REQ_DISCARD)
1141 return sd_setup_discard_cmnd(cmd);
1142 else if (rq->cmd_flags & REQ_WRITE_SAME)
1143 return sd_setup_write_same_cmnd(cmd);
1144 else if (rq->cmd_flags & REQ_FLUSH)
1145 return sd_setup_flush_cmnd(cmd);
1147 return sd_setup_read_write_cmnd(cmd);
1150 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1152 struct request *rq = SCpnt->request;
1154 if (rq->cmd_flags & REQ_DISCARD)
1155 __free_page(rq->completion_data);
1157 if (SCpnt->cmnd != rq->cmd) {
1158 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1165 * sd_open - open a scsi disk device
1166 * @inode: only i_rdev member may be used
1167 * @filp: only f_mode and f_flags may be used
1169 * Returns 0 if successful. Returns a negated errno value in case
1172 * Note: This can be called from a user context (e.g. fsck(1) )
1173 * or from within the kernel (e.g. as a result of a mount(1) ).
1174 * In the latter case @inode and @filp carry an abridged amount
1175 * of information as noted above.
1177 * Locking: called with bdev->bd_mutex held.
1179 static int sd_open(struct block_device *bdev, fmode_t mode)
1181 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1182 struct scsi_device *sdev;
1188 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1190 sdev = sdkp->device;
1193 * If the device is in error recovery, wait until it is done.
1194 * If the device is offline, then disallow any access to it.
1197 if (!scsi_block_when_processing_errors(sdev))
1200 if (sdev->removable || sdkp->write_prot)
1201 check_disk_change(bdev);
1204 * If the drive is empty, just let the open fail.
1206 retval = -ENOMEDIUM;
1207 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1211 * If the device has the write protect tab set, have the open fail
1212 * if the user expects to be able to write to the thing.
1215 if (sdkp->write_prot && (mode & FMODE_WRITE))
1219 * It is possible that the disk changing stuff resulted in
1220 * the device being taken offline. If this is the case,
1221 * report this to the user, and don't pretend that the
1222 * open actually succeeded.
1225 if (!scsi_device_online(sdev))
1228 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1229 if (scsi_block_when_processing_errors(sdev))
1230 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1236 scsi_disk_put(sdkp);
1241 * sd_release - invoked when the (last) close(2) is called on this
1243 * @inode: only i_rdev member may be used
1244 * @filp: only f_mode and f_flags may be used
1248 * Note: may block (uninterruptible) if error recovery is underway
1251 * Locking: called with bdev->bd_mutex held.
1253 static void sd_release(struct gendisk *disk, fmode_t mode)
1255 struct scsi_disk *sdkp = scsi_disk(disk);
1256 struct scsi_device *sdev = sdkp->device;
1258 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1260 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1261 if (scsi_block_when_processing_errors(sdev))
1262 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1266 * XXX and what if there are packets in flight and this close()
1267 * XXX is followed by a "rmmod sd_mod"?
1270 scsi_disk_put(sdkp);
1273 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1275 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1276 struct scsi_device *sdp = sdkp->device;
1277 struct Scsi_Host *host = sdp->host;
1278 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1281 /* default to most commonly used values */
1282 diskinfo[0] = 0x40; /* 1 << 6 */
1283 diskinfo[1] = 0x20; /* 1 << 5 */
1284 diskinfo[2] = capacity >> 11;
1286 /* override with calculated, extended default, or driver values */
1287 if (host->hostt->bios_param)
1288 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1290 scsicam_bios_param(bdev, capacity, diskinfo);
1292 geo->heads = diskinfo[0];
1293 geo->sectors = diskinfo[1];
1294 geo->cylinders = diskinfo[2];
1299 * sd_ioctl - process an ioctl
1300 * @inode: only i_rdev/i_bdev members may be used
1301 * @filp: only f_mode and f_flags may be used
1302 * @cmd: ioctl command number
1303 * @arg: this is third argument given to ioctl(2) system call.
1304 * Often contains a pointer.
1306 * Returns 0 if successful (some ioctls return positive numbers on
1307 * success as well). Returns a negated errno value in case of error.
1309 * Note: most ioctls are forward onto the block subsystem or further
1310 * down in the scsi subsystem.
1312 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1313 unsigned int cmd, unsigned long arg)
1315 struct gendisk *disk = bdev->bd_disk;
1316 struct scsi_disk *sdkp = scsi_disk(disk);
1317 struct scsi_device *sdp = sdkp->device;
1318 void __user *p = (void __user *)arg;
1321 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1322 "cmd=0x%x\n", disk->disk_name, cmd));
1324 error = scsi_verify_blk_ioctl(bdev, cmd);
1329 * If we are in the middle of error recovery, don't let anyone
1330 * else try and use this device. Also, if error recovery fails, it
1331 * may try and take the device offline, in which case all further
1332 * access to the device is prohibited.
1334 error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1335 (mode & FMODE_NDELAY) != 0);
1340 * Send SCSI addressing ioctls directly to mid level, send other
1341 * ioctls to block level and then onto mid level if they can't be
1345 case SCSI_IOCTL_GET_IDLUN:
1346 case SCSI_IOCTL_GET_BUS_NUMBER:
1347 error = scsi_ioctl(sdp, cmd, p);
1350 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1351 if (error != -ENOTTY)
1353 error = scsi_ioctl(sdp, cmd, p);
1360 static void set_media_not_present(struct scsi_disk *sdkp)
1362 if (sdkp->media_present)
1363 sdkp->device->changed = 1;
1365 if (sdkp->device->removable) {
1366 sdkp->media_present = 0;
1371 static int media_not_present(struct scsi_disk *sdkp,
1372 struct scsi_sense_hdr *sshdr)
1374 if (!scsi_sense_valid(sshdr))
1377 /* not invoked for commands that could return deferred errors */
1378 switch (sshdr->sense_key) {
1379 case UNIT_ATTENTION:
1381 /* medium not present */
1382 if (sshdr->asc == 0x3A) {
1383 set_media_not_present(sdkp);
1391 * sd_check_events - check media events
1392 * @disk: kernel device descriptor
1393 * @clearing: disk events currently being cleared
1395 * Returns mask of DISK_EVENT_*.
1397 * Note: this function is invoked from the block subsystem.
1399 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1401 struct scsi_disk *sdkp = scsi_disk_get(disk);
1402 struct scsi_device *sdp;
1403 struct scsi_sense_hdr *sshdr = NULL;
1410 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1413 * If the device is offline, don't send any commands - just pretend as
1414 * if the command failed. If the device ever comes back online, we
1415 * can deal with it then. It is only because of unrecoverable errors
1416 * that we would ever take a device offline in the first place.
1418 if (!scsi_device_online(sdp)) {
1419 set_media_not_present(sdkp);
1424 * Using TEST_UNIT_READY enables differentiation between drive with
1425 * no cartridge loaded - NOT READY, drive with changed cartridge -
1426 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1428 * Drives that auto spin down. eg iomega jaz 1G, will be started
1429 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1430 * sd_revalidate() is called.
1434 if (scsi_block_when_processing_errors(sdp)) {
1435 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1436 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1440 /* failed to execute TUR, assume media not present */
1441 if (host_byte(retval)) {
1442 set_media_not_present(sdkp);
1446 if (media_not_present(sdkp, sshdr))
1450 * For removable scsi disk we have to recognise the presence
1451 * of a disk in the drive.
1453 if (!sdkp->media_present)
1455 sdkp->media_present = 1;
1458 * sdp->changed is set under the following conditions:
1460 * Medium present state has changed in either direction.
1461 * Device has indicated UNIT_ATTENTION.
1464 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1466 scsi_disk_put(sdkp);
1470 static int sd_sync_cache(struct scsi_disk *sdkp)
1473 struct scsi_device *sdp = sdkp->device;
1474 const int timeout = sdp->request_queue->rq_timeout
1475 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1476 struct scsi_sense_hdr sshdr;
1478 if (!scsi_device_online(sdp))
1481 for (retries = 3; retries > 0; --retries) {
1482 unsigned char cmd[10] = { 0 };
1484 cmd[0] = SYNCHRONIZE_CACHE;
1486 * Leave the rest of the command zero to indicate
1489 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1490 &sshdr, timeout, SD_MAX_RETRIES,
1497 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1499 if (driver_byte(res) & DRIVER_SENSE)
1500 sd_print_sense_hdr(sdkp, &sshdr);
1501 /* we need to evaluate the error return */
1502 if (scsi_sense_valid(&sshdr) &&
1503 (sshdr.asc == 0x3a || /* medium not present */
1504 sshdr.asc == 0x20)) /* invalid command */
1505 /* this is no error here */
1508 switch (host_byte(res)) {
1509 /* ignore errors due to racing a disconnection */
1510 case DID_BAD_TARGET:
1511 case DID_NO_CONNECT:
1513 /* signal the upper layer it might try again */
1517 case DID_SOFT_ERROR:
1526 static void sd_rescan(struct device *dev)
1528 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1530 revalidate_disk(sdkp->disk);
1534 #ifdef CONFIG_COMPAT
1536 * This gets directly called from VFS. When the ioctl
1537 * is not recognized we go back to the other translation paths.
1539 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1540 unsigned int cmd, unsigned long arg)
1542 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1545 error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1546 (mode & FMODE_NDELAY) != 0);
1551 * Let the static ioctl translation table take care of it.
1553 if (!sdev->host->hostt->compat_ioctl)
1554 return -ENOIOCTLCMD;
1555 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1559 static char sd_pr_type(enum pr_type type)
1562 case PR_WRITE_EXCLUSIVE:
1564 case PR_EXCLUSIVE_ACCESS:
1566 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1568 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1570 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1572 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1579 static int sd_pr_command(struct block_device *bdev, u8 sa,
1580 u64 key, u64 sa_key, u8 type, u8 flags)
1582 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1583 struct scsi_sense_hdr sshdr;
1585 u8 cmd[16] = { 0, };
1586 u8 data[24] = { 0, };
1588 cmd[0] = PERSISTENT_RESERVE_OUT;
1591 put_unaligned_be32(sizeof(data), &cmd[5]);
1593 put_unaligned_be64(key, &data[0]);
1594 put_unaligned_be64(sa_key, &data[8]);
1597 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1598 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1600 if ((driver_byte(result) & DRIVER_SENSE) &&
1601 (scsi_sense_valid(&sshdr))) {
1602 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1603 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1609 static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1612 if (flags & ~PR_FL_IGNORE_KEY)
1614 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1615 old_key, new_key, 0,
1616 (1 << 0) /* APTPL */ |
1617 (1 << 2) /* ALL_TG_PT */);
1620 static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1625 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1628 static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1630 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1633 static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1634 enum pr_type type, bool abort)
1636 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1637 sd_pr_type(type), 0);
1640 static int sd_pr_clear(struct block_device *bdev, u64 key)
1642 return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1645 static const struct pr_ops sd_pr_ops = {
1646 .pr_register = sd_pr_register,
1647 .pr_reserve = sd_pr_reserve,
1648 .pr_release = sd_pr_release,
1649 .pr_preempt = sd_pr_preempt,
1650 .pr_clear = sd_pr_clear,
1653 static const struct block_device_operations sd_fops = {
1654 .owner = THIS_MODULE,
1656 .release = sd_release,
1658 .getgeo = sd_getgeo,
1659 #ifdef CONFIG_COMPAT
1660 .compat_ioctl = sd_compat_ioctl,
1662 .check_events = sd_check_events,
1663 .revalidate_disk = sd_revalidate_disk,
1664 .unlock_native_capacity = sd_unlock_native_capacity,
1665 .pr_ops = &sd_pr_ops,
1669 * sd_eh_action - error handling callback
1670 * @scmd: sd-issued command that has failed
1671 * @eh_disp: The recovery disposition suggested by the midlayer
1673 * This function is called by the SCSI midlayer upon completion of an
1674 * error test command (currently TEST UNIT READY). The result of sending
1675 * the eh command is passed in eh_disp. We're looking for devices that
1676 * fail medium access commands but are OK with non access commands like
1677 * test unit ready (so wrongly see the device as having a successful
1680 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1682 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1684 if (!scsi_device_online(scmd->device) ||
1685 !scsi_medium_access_command(scmd) ||
1686 host_byte(scmd->result) != DID_TIME_OUT ||
1691 * The device has timed out executing a medium access command.
1692 * However, the TEST UNIT READY command sent during error
1693 * handling completed successfully. Either the device is in the
1694 * process of recovering or has it suffered an internal failure
1695 * that prevents access to the storage medium.
1697 sdkp->medium_access_timed_out++;
1700 * If the device keeps failing read/write commands but TEST UNIT
1701 * READY always completes successfully we assume that medium
1702 * access is no longer possible and take the device offline.
1704 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1705 scmd_printk(KERN_ERR, scmd,
1706 "Medium access timeout failure. Offlining disk!\n");
1707 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1715 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1717 u64 start_lba = blk_rq_pos(scmd->request);
1718 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1719 u64 factor = scmd->device->sector_size / 512;
1723 * resid is optional but mostly filled in. When it's unused,
1724 * its value is zero, so we assume the whole buffer transferred
1726 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1727 unsigned int good_bytes;
1729 if (scmd->request->cmd_type != REQ_TYPE_FS)
1732 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1733 SCSI_SENSE_BUFFERSIZE,
1738 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1741 /* be careful ... don't want any overflows */
1742 do_div(start_lba, factor);
1743 do_div(end_lba, factor);
1745 /* The bad lba was reported incorrectly, we have no idea where
1748 if (bad_lba < start_lba || bad_lba >= end_lba)
1751 /* This computation should always be done in terms of
1752 * the resolution of the device's medium.
1754 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1755 return min(good_bytes, transferred);
1759 * sd_done - bottom half handler: called when the lower level
1760 * driver has completed (successfully or otherwise) a scsi command.
1761 * @SCpnt: mid-level's per command structure.
1763 * Note: potentially run from within an ISR. Must not block.
1765 static int sd_done(struct scsi_cmnd *SCpnt)
1767 int result = SCpnt->result;
1768 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1769 struct scsi_sense_hdr sshdr;
1770 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1771 struct request *req = SCpnt->request;
1772 int sense_valid = 0;
1773 int sense_deferred = 0;
1774 unsigned char op = SCpnt->cmnd[0];
1775 unsigned char unmap = SCpnt->cmnd[1] & 8;
1777 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1779 good_bytes = blk_rq_bytes(req);
1780 scsi_set_resid(SCpnt, 0);
1783 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1788 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1790 sense_deferred = scsi_sense_is_deferred(&sshdr);
1792 sdkp->medium_access_timed_out = 0;
1794 if (driver_byte(result) != DRIVER_SENSE &&
1795 (!sense_valid || sense_deferred))
1798 switch (sshdr.sense_key) {
1799 case HARDWARE_ERROR:
1801 good_bytes = sd_completed_bytes(SCpnt);
1803 case RECOVERED_ERROR:
1804 good_bytes = scsi_bufflen(SCpnt);
1807 /* This indicates a false check condition, so ignore it. An
1808 * unknown amount of data was transferred so treat it as an
1812 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1814 case ABORTED_COMMAND:
1815 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1816 good_bytes = sd_completed_bytes(SCpnt);
1818 case ILLEGAL_REQUEST:
1819 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1820 good_bytes = sd_completed_bytes(SCpnt);
1821 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1822 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1825 sd_config_discard(sdkp, SD_LBP_DISABLE);
1830 sd_config_discard(sdkp, SD_LBP_DISABLE);
1832 sdkp->device->no_write_same = 1;
1833 sd_config_write_same(sdkp);
1836 req->__data_len = blk_rq_bytes(req);
1837 req->cmd_flags |= REQ_QUIET;
1846 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1847 "sd_done: completed %d of %d bytes\n",
1848 good_bytes, scsi_bufflen(SCpnt)));
1850 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1851 sd_dif_complete(SCpnt, good_bytes);
1857 * spinup disk - called only in sd_revalidate_disk()
1860 sd_spinup_disk(struct scsi_disk *sdkp)
1862 unsigned char cmd[10];
1863 unsigned long spintime_expire = 0;
1864 int retries, spintime;
1865 unsigned int the_result;
1866 struct scsi_sense_hdr sshdr;
1867 int sense_valid = 0;
1871 /* Spin up drives, as required. Only do this at boot time */
1872 /* Spinup needs to be done for module loads too. */
1877 cmd[0] = TEST_UNIT_READY;
1878 memset((void *) &cmd[1], 0, 9);
1880 the_result = scsi_execute_req(sdkp->device, cmd,
1883 SD_MAX_RETRIES, NULL);
1886 * If the drive has indicated to us that it
1887 * doesn't have any media in it, don't bother
1888 * with any more polling.
1890 if (media_not_present(sdkp, &sshdr))
1894 sense_valid = scsi_sense_valid(&sshdr);
1896 } while (retries < 3 &&
1897 (!scsi_status_is_good(the_result) ||
1898 ((driver_byte(the_result) & DRIVER_SENSE) &&
1899 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1901 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1902 /* no sense, TUR either succeeded or failed
1903 * with a status error */
1904 if(!spintime && !scsi_status_is_good(the_result)) {
1905 sd_print_result(sdkp, "Test Unit Ready failed",
1912 * The device does not want the automatic start to be issued.
1914 if (sdkp->device->no_start_on_add)
1917 if (sense_valid && sshdr.sense_key == NOT_READY) {
1918 if (sshdr.asc == 4 && sshdr.ascq == 3)
1919 break; /* manual intervention required */
1920 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1921 break; /* standby */
1922 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1923 break; /* unavailable */
1925 * Issue command to spin up drive when not ready
1928 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1929 cmd[0] = START_STOP;
1930 cmd[1] = 1; /* Return immediately */
1931 memset((void *) &cmd[2], 0, 8);
1932 cmd[4] = 1; /* Start spin cycle */
1933 if (sdkp->device->start_stop_pwr_cond)
1935 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1937 SD_TIMEOUT, SD_MAX_RETRIES,
1939 spintime_expire = jiffies + 100 * HZ;
1942 /* Wait 1 second for next try */
1947 * Wait for USB flash devices with slow firmware.
1948 * Yes, this sense key/ASC combination shouldn't
1949 * occur here. It's characteristic of these devices.
1951 } else if (sense_valid &&
1952 sshdr.sense_key == UNIT_ATTENTION &&
1953 sshdr.asc == 0x28) {
1955 spintime_expire = jiffies + 5 * HZ;
1958 /* Wait 1 second for next try */
1961 /* we don't understand the sense code, so it's
1962 * probably pointless to loop */
1964 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1965 sd_print_sense_hdr(sdkp, &sshdr);
1970 } while (spintime && time_before_eq(jiffies, spintime_expire));
1973 if (scsi_status_is_good(the_result))
1976 printk("not responding...\n");
1982 * Determine whether disk supports Data Integrity Field.
1984 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1986 struct scsi_device *sdp = sdkp->device;
1990 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1993 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1995 if (type > SD_DIF_TYPE3_PROTECTION)
1997 else if (scsi_host_dif_capable(sdp->host, type))
2000 if (sdkp->first_scan || type != sdkp->protection_type)
2003 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2004 " protection type %u. Disabling disk!\n",
2008 sd_printk(KERN_NOTICE, sdkp,
2009 "Enabling DIF Type %u protection\n", type);
2012 sd_printk(KERN_NOTICE, sdkp,
2013 "Disabling DIF Type %u protection\n", type);
2017 sdkp->protection_type = type;
2022 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2023 struct scsi_sense_hdr *sshdr, int sense_valid,
2026 if (driver_byte(the_result) & DRIVER_SENSE)
2027 sd_print_sense_hdr(sdkp, sshdr);
2029 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2032 * Set dirty bit for removable devices if not ready -
2033 * sometimes drives will not report this properly.
2035 if (sdp->removable &&
2036 sense_valid && sshdr->sense_key == NOT_READY)
2037 set_media_not_present(sdkp);
2040 * We used to set media_present to 0 here to indicate no media
2041 * in the drive, but some drives fail read capacity even with
2042 * media present, so we can't do that.
2044 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2048 #if RC16_LEN > SD_BUF_SIZE
2049 #error RC16_LEN must not be more than SD_BUF_SIZE
2052 #define READ_CAPACITY_RETRIES_ON_RESET 10
2054 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2055 unsigned char *buffer)
2057 unsigned char cmd[16];
2058 struct scsi_sense_hdr sshdr;
2059 int sense_valid = 0;
2061 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2062 unsigned int alignment;
2063 unsigned long long lba;
2064 unsigned sector_size;
2066 if (sdp->no_read_capacity_16)
2071 cmd[0] = SERVICE_ACTION_IN_16;
2072 cmd[1] = SAI_READ_CAPACITY_16;
2074 memset(buffer, 0, RC16_LEN);
2076 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2077 buffer, RC16_LEN, &sshdr,
2078 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2080 if (media_not_present(sdkp, &sshdr))
2084 sense_valid = scsi_sense_valid(&sshdr);
2086 sshdr.sense_key == ILLEGAL_REQUEST &&
2087 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2089 /* Invalid Command Operation Code or
2090 * Invalid Field in CDB, just retry
2091 * silently with RC10 */
2094 sshdr.sense_key == UNIT_ATTENTION &&
2095 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2096 /* Device reset might occur several times,
2097 * give it one more chance */
2098 if (--reset_retries > 0)
2103 } while (the_result && retries);
2106 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2107 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2111 sector_size = get_unaligned_be32(&buffer[8]);
2112 lba = get_unaligned_be64(&buffer[0]);
2114 if (sd_read_protection_type(sdkp, buffer) < 0) {
2119 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2120 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2121 "kernel compiled with support for large block "
2127 /* Logical blocks per physical block exponent */
2128 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2130 /* Lowest aligned logical block */
2131 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2132 blk_queue_alignment_offset(sdp->request_queue, alignment);
2133 if (alignment && sdkp->first_scan)
2134 sd_printk(KERN_NOTICE, sdkp,
2135 "physical block alignment offset: %u\n", alignment);
2137 if (buffer[14] & 0x80) { /* LBPME */
2140 if (buffer[14] & 0x40) /* LBPRZ */
2143 sd_config_discard(sdkp, SD_LBP_WS16);
2146 sdkp->capacity = lba + 1;
2150 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2151 unsigned char *buffer)
2153 unsigned char cmd[16];
2154 struct scsi_sense_hdr sshdr;
2155 int sense_valid = 0;
2157 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2159 unsigned sector_size;
2162 cmd[0] = READ_CAPACITY;
2163 memset(&cmd[1], 0, 9);
2164 memset(buffer, 0, 8);
2166 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2168 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2170 if (media_not_present(sdkp, &sshdr))
2174 sense_valid = scsi_sense_valid(&sshdr);
2176 sshdr.sense_key == UNIT_ATTENTION &&
2177 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2178 /* Device reset might occur several times,
2179 * give it one more chance */
2180 if (--reset_retries > 0)
2185 } while (the_result && retries);
2188 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2189 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2193 sector_size = get_unaligned_be32(&buffer[4]);
2194 lba = get_unaligned_be32(&buffer[0]);
2196 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2197 /* Some buggy (usb cardreader) devices return an lba of
2198 0xffffffff when the want to report a size of 0 (with
2199 which they really mean no media is present) */
2201 sdkp->physical_block_size = sector_size;
2205 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2206 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2207 "kernel compiled with support for large block "
2213 sdkp->capacity = lba + 1;
2214 sdkp->physical_block_size = sector_size;
2218 static int sd_try_rc16_first(struct scsi_device *sdp)
2220 if (sdp->host->max_cmd_len < 16)
2222 if (sdp->try_rc_10_first)
2224 if (sdp->scsi_level > SCSI_SPC_2)
2226 if (scsi_device_protection(sdp))
2232 * read disk capacity
2235 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2238 struct scsi_device *sdp = sdkp->device;
2239 sector_t old_capacity = sdkp->capacity;
2241 if (sd_try_rc16_first(sdp)) {
2242 sector_size = read_capacity_16(sdkp, sdp, buffer);
2243 if (sector_size == -EOVERFLOW)
2245 if (sector_size == -ENODEV)
2247 if (sector_size < 0)
2248 sector_size = read_capacity_10(sdkp, sdp, buffer);
2249 if (sector_size < 0)
2252 sector_size = read_capacity_10(sdkp, sdp, buffer);
2253 if (sector_size == -EOVERFLOW)
2255 if (sector_size < 0)
2257 if ((sizeof(sdkp->capacity) > 4) &&
2258 (sdkp->capacity > 0xffffffffULL)) {
2259 int old_sector_size = sector_size;
2260 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2261 "Trying to use READ CAPACITY(16).\n");
2262 sector_size = read_capacity_16(sdkp, sdp, buffer);
2263 if (sector_size < 0) {
2264 sd_printk(KERN_NOTICE, sdkp,
2265 "Using 0xffffffff as device size\n");
2266 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2267 sector_size = old_sector_size;
2273 /* Some devices are known to return the total number of blocks,
2274 * not the highest block number. Some devices have versions
2275 * which do this and others which do not. Some devices we might
2276 * suspect of doing this but we don't know for certain.
2278 * If we know the reported capacity is wrong, decrement it. If
2279 * we can only guess, then assume the number of blocks is even
2280 * (usually true but not always) and err on the side of lowering
2283 if (sdp->fix_capacity ||
2284 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2285 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2286 "from its reported value: %llu\n",
2287 (unsigned long long) sdkp->capacity);
2292 if (sector_size == 0) {
2294 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2298 if (sector_size != 512 &&
2299 sector_size != 1024 &&
2300 sector_size != 2048 &&
2301 sector_size != 4096) {
2302 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2305 * The user might want to re-format the drive with
2306 * a supported sectorsize. Once this happens, it
2307 * would be relatively trivial to set the thing up.
2308 * For this reason, we leave the thing in the table.
2312 * set a bogus sector size so the normal read/write
2313 * logic in the block layer will eventually refuse any
2314 * request on this device without tripping over power
2315 * of two sector size assumptions
2319 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2322 char cap_str_2[10], cap_str_10[10];
2324 string_get_size(sdkp->capacity, sector_size,
2325 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2326 string_get_size(sdkp->capacity, sector_size,
2327 STRING_UNITS_10, cap_str_10,
2328 sizeof(cap_str_10));
2330 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2331 sd_printk(KERN_NOTICE, sdkp,
2332 "%llu %d-byte logical blocks: (%s/%s)\n",
2333 (unsigned long long)sdkp->capacity,
2334 sector_size, cap_str_10, cap_str_2);
2336 if (sdkp->physical_block_size != sector_size)
2337 sd_printk(KERN_NOTICE, sdkp,
2338 "%u-byte physical blocks\n",
2339 sdkp->physical_block_size);
2343 if (sdkp->capacity > 0xffffffff)
2344 sdp->use_16_for_rw = 1;
2346 blk_queue_physical_block_size(sdp->request_queue,
2347 sdkp->physical_block_size);
2348 sdkp->device->sector_size = sector_size;
2351 /* called with buffer of length 512 */
2353 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2354 unsigned char *buffer, int len, struct scsi_mode_data *data,
2355 struct scsi_sense_hdr *sshdr)
2357 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2358 SD_TIMEOUT, SD_MAX_RETRIES, data,
2363 * read write protect setting, if possible - called only in sd_revalidate_disk()
2364 * called with buffer of length SD_BUF_SIZE
2367 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2370 struct scsi_device *sdp = sdkp->device;
2371 struct scsi_mode_data data;
2372 int old_wp = sdkp->write_prot;
2374 set_disk_ro(sdkp->disk, 0);
2375 if (sdp->skip_ms_page_3f) {
2376 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2380 if (sdp->use_192_bytes_for_3f) {
2381 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2384 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2385 * We have to start carefully: some devices hang if we ask
2386 * for more than is available.
2388 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2391 * Second attempt: ask for page 0 When only page 0 is
2392 * implemented, a request for page 3F may return Sense Key
2393 * 5: Illegal Request, Sense Code 24: Invalid field in
2396 if (!scsi_status_is_good(res))
2397 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2400 * Third attempt: ask 255 bytes, as we did earlier.
2402 if (!scsi_status_is_good(res))
2403 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2407 if (!scsi_status_is_good(res)) {
2408 sd_first_printk(KERN_WARNING, sdkp,
2409 "Test WP failed, assume Write Enabled\n");
2411 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2412 set_disk_ro(sdkp->disk, sdkp->write_prot);
2413 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2414 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2415 sdkp->write_prot ? "on" : "off");
2416 sd_printk(KERN_DEBUG, sdkp,
2417 "Mode Sense: %02x %02x %02x %02x\n",
2418 buffer[0], buffer[1], buffer[2], buffer[3]);
2424 * sd_read_cache_type - called only from sd_revalidate_disk()
2425 * called with buffer of length SD_BUF_SIZE
2428 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2431 struct scsi_device *sdp = sdkp->device;
2436 struct scsi_mode_data data;
2437 struct scsi_sense_hdr sshdr;
2438 int old_wce = sdkp->WCE;
2439 int old_rcd = sdkp->RCD;
2440 int old_dpofua = sdkp->DPOFUA;
2443 if (sdkp->cache_override)
2447 if (sdp->skip_ms_page_8) {
2448 if (sdp->type == TYPE_RBC)
2451 if (sdp->skip_ms_page_3f)
2454 if (sdp->use_192_bytes_for_3f)
2458 } else if (sdp->type == TYPE_RBC) {
2466 /* cautiously ask */
2467 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2470 if (!scsi_status_is_good(res))
2473 if (!data.header_length) {
2476 sd_first_printk(KERN_ERR, sdkp,
2477 "Missing header in MODE_SENSE response\n");
2480 /* that went OK, now ask for the proper length */
2484 * We're only interested in the first three bytes, actually.
2485 * But the data cache page is defined for the first 20.
2489 else if (len > SD_BUF_SIZE) {
2490 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2491 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2494 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2498 if (len > first_len)
2499 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2502 if (scsi_status_is_good(res)) {
2503 int offset = data.header_length + data.block_descriptor_length;
2505 while (offset < len) {
2506 u8 page_code = buffer[offset] & 0x3F;
2507 u8 spf = buffer[offset] & 0x40;
2509 if (page_code == 8 || page_code == 6) {
2510 /* We're interested only in the first 3 bytes.
2512 if (len - offset <= 2) {
2513 sd_first_printk(KERN_ERR, sdkp,
2514 "Incomplete mode parameter "
2518 modepage = page_code;
2522 /* Go to the next page */
2523 if (spf && len - offset > 3)
2524 offset += 4 + (buffer[offset+2] << 8) +
2526 else if (!spf && len - offset > 1)
2527 offset += 2 + buffer[offset+1];
2529 sd_first_printk(KERN_ERR, sdkp,
2531 "parameter data\n");
2537 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2541 if (modepage == 8) {
2542 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2543 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2545 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2549 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2550 if (sdp->broken_fua) {
2551 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2553 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2554 sd_first_printk(KERN_NOTICE, sdkp,
2555 "Uses READ/WRITE(6), disabling FUA\n");
2559 /* No cache flush allowed for write protected devices */
2560 if (sdkp->WCE && sdkp->write_prot)
2563 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2564 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2565 sd_printk(KERN_NOTICE, sdkp,
2566 "Write cache: %s, read cache: %s, %s\n",
2567 sdkp->WCE ? "enabled" : "disabled",
2568 sdkp->RCD ? "disabled" : "enabled",
2569 sdkp->DPOFUA ? "supports DPO and FUA"
2570 : "doesn't support DPO or FUA");
2576 if (scsi_sense_valid(&sshdr) &&
2577 sshdr.sense_key == ILLEGAL_REQUEST &&
2578 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2579 /* Invalid field in CDB */
2580 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2582 sd_first_printk(KERN_ERR, sdkp,
2583 "Asking for cache data failed\n");
2586 if (sdp->wce_default_on) {
2587 sd_first_printk(KERN_NOTICE, sdkp,
2588 "Assuming drive cache: write back\n");
2591 sd_first_printk(KERN_ERR, sdkp,
2592 "Assuming drive cache: write through\n");
2600 * The ATO bit indicates whether the DIF application tag is available
2601 * for use by the operating system.
2603 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2606 struct scsi_device *sdp = sdkp->device;
2607 struct scsi_mode_data data;
2608 struct scsi_sense_hdr sshdr;
2610 if (sdp->type != TYPE_DISK)
2613 if (sdkp->protection_type == 0)
2616 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2617 SD_MAX_RETRIES, &data, &sshdr);
2619 if (!scsi_status_is_good(res) || !data.header_length ||
2621 sd_first_printk(KERN_WARNING, sdkp,
2622 "getting Control mode page failed, assume no ATO\n");
2624 if (scsi_sense_valid(&sshdr))
2625 sd_print_sense_hdr(sdkp, &sshdr);
2630 offset = data.header_length + data.block_descriptor_length;
2632 if ((buffer[offset] & 0x3f) != 0x0a) {
2633 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2637 if ((buffer[offset + 5] & 0x80) == 0)
2646 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2647 * @disk: disk to query
2649 static void sd_read_block_limits(struct scsi_disk *sdkp)
2651 unsigned int sector_sz = sdkp->device->sector_size;
2652 const int vpd_len = 64;
2653 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2656 /* Block Limits VPD */
2657 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2660 blk_queue_io_min(sdkp->disk->queue,
2661 get_unaligned_be16(&buffer[6]) * sector_sz);
2663 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2664 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2666 if (buffer[3] == 0x3c) {
2667 unsigned int lba_count, desc_count;
2669 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2674 lba_count = get_unaligned_be32(&buffer[20]);
2675 desc_count = get_unaligned_be32(&buffer[24]);
2677 if (lba_count && desc_count)
2678 sdkp->max_unmap_blocks = lba_count;
2680 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2682 if (buffer[32] & 0x80)
2683 sdkp->unmap_alignment =
2684 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2686 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2688 if (sdkp->max_unmap_blocks)
2689 sd_config_discard(sdkp, SD_LBP_UNMAP);
2691 sd_config_discard(sdkp, SD_LBP_WS16);
2693 } else { /* LBP VPD page tells us what to use */
2694 if (sdkp->lbpu && sdkp->max_unmap_blocks && !sdkp->lbprz)
2695 sd_config_discard(sdkp, SD_LBP_UNMAP);
2696 else if (sdkp->lbpws)
2697 sd_config_discard(sdkp, SD_LBP_WS16);
2698 else if (sdkp->lbpws10)
2699 sd_config_discard(sdkp, SD_LBP_WS10);
2700 else if (sdkp->lbpu && sdkp->max_unmap_blocks)
2701 sd_config_discard(sdkp, SD_LBP_UNMAP);
2703 sd_config_discard(sdkp, SD_LBP_DISABLE);
2712 * sd_read_block_characteristics - Query block dev. characteristics
2713 * @disk: disk to query
2715 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2717 unsigned char *buffer;
2719 const int vpd_len = 64;
2721 buffer = kmalloc(vpd_len, GFP_KERNEL);
2724 /* Block Device Characteristics VPD */
2725 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2728 rot = get_unaligned_be16(&buffer[4]);
2731 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2732 queue_flag_clear_unlocked(QUEUE_FLAG_ADD_RANDOM, sdkp->disk->queue);
2740 * sd_read_block_provisioning - Query provisioning VPD page
2741 * @disk: disk to query
2743 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2745 unsigned char *buffer;
2746 const int vpd_len = 8;
2748 if (sdkp->lbpme == 0)
2751 buffer = kmalloc(vpd_len, GFP_KERNEL);
2753 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2757 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2758 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2759 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2765 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2767 struct scsi_device *sdev = sdkp->device;
2769 if (sdev->host->no_write_same) {
2770 sdev->no_write_same = 1;
2775 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2776 /* too large values might cause issues with arcmsr */
2777 int vpd_buf_len = 64;
2779 sdev->no_report_opcodes = 1;
2781 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2782 * CODES is unsupported and the device has an ATA
2783 * Information VPD page (SAT).
2785 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2786 sdev->no_write_same = 1;
2789 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2792 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2796 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2798 /* Attempt VPD inquiry if the device blacklist explicitly calls
2801 if (sdp->try_vpd_pages)
2804 * Although VPD inquiries can go to SCSI-2 type devices,
2805 * some USB ones crash on receiving them, and the pages
2806 * we currently ask for are for SPC-3 and beyond
2808 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2814 * sd_revalidate_disk - called the first time a new disk is seen,
2815 * performs disk spin up, read_capacity, etc.
2816 * @disk: struct gendisk we care about
2818 static int sd_revalidate_disk(struct gendisk *disk)
2820 struct scsi_disk *sdkp = scsi_disk(disk);
2821 struct scsi_device *sdp = sdkp->device;
2822 struct request_queue *q = sdkp->disk->queue;
2823 unsigned char *buffer;
2824 unsigned int dev_max, rw_max;
2826 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2827 "sd_revalidate_disk\n"));
2830 * If the device is offline, don't try and read capacity or any
2831 * of the other niceties.
2833 if (!scsi_device_online(sdp))
2836 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2838 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2839 "allocation failure.\n");
2843 sd_spinup_disk(sdkp);
2846 * Without media there is no reason to ask; moreover, some devices
2847 * react badly if we do.
2849 if (sdkp->media_present) {
2850 sd_read_capacity(sdkp, buffer);
2852 if (sd_try_extended_inquiry(sdp)) {
2853 sd_read_block_provisioning(sdkp);
2854 sd_read_block_limits(sdkp);
2855 sd_read_block_characteristics(sdkp);
2858 sd_read_write_protect_flag(sdkp, buffer);
2859 sd_read_cache_type(sdkp, buffer);
2860 sd_read_app_tag_own(sdkp, buffer);
2861 sd_read_write_same(sdkp, buffer);
2864 sdkp->first_scan = 0;
2867 * We now have all cache related info, determine how we deal
2868 * with flush requests.
2870 sd_set_flush_flag(sdkp);
2872 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
2873 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
2875 /* Some devices report a maximum block count for READ/WRITE requests. */
2876 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
2877 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
2880 * Use the device's preferred I/O size for reads and writes
2881 * unless the reported value is unreasonably small, large, or
2884 if (sdkp->opt_xfer_blocks &&
2885 sdkp->opt_xfer_blocks <= dev_max &&
2886 sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
2887 logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_CACHE_SIZE) {
2888 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
2889 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
2891 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
2892 (sector_t)BLK_DEF_MAX_SECTORS);
2894 /* Combine with controller limits */
2895 q->limits.max_sectors = min(rw_max, queue_max_hw_sectors(q));
2897 set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
2898 sd_config_write_same(sdkp);
2906 * sd_unlock_native_capacity - unlock native capacity
2907 * @disk: struct gendisk to set capacity for
2909 * Block layer calls this function if it detects that partitions
2910 * on @disk reach beyond the end of the device. If the SCSI host
2911 * implements ->unlock_native_capacity() method, it's invoked to
2912 * give it a chance to adjust the device capacity.
2915 * Defined by block layer. Might sleep.
2917 static void sd_unlock_native_capacity(struct gendisk *disk)
2919 struct scsi_device *sdev = scsi_disk(disk)->device;
2921 if (sdev->host->hostt->unlock_native_capacity)
2922 sdev->host->hostt->unlock_native_capacity(sdev);
2926 * sd_format_disk_name - format disk name
2927 * @prefix: name prefix - ie. "sd" for SCSI disks
2928 * @index: index of the disk to format name for
2929 * @buf: output buffer
2930 * @buflen: length of the output buffer
2932 * SCSI disk names starts at sda. The 26th device is sdz and the
2933 * 27th is sdaa. The last one for two lettered suffix is sdzz
2934 * which is followed by sdaaa.
2936 * This is basically 26 base counting with one extra 'nil' entry
2937 * at the beginning from the second digit on and can be
2938 * determined using similar method as 26 base conversion with the
2939 * index shifted -1 after each digit is computed.
2945 * 0 on success, -errno on failure.
2947 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2949 const int base = 'z' - 'a' + 1;
2950 char *begin = buf + strlen(prefix);
2951 char *end = buf + buflen;
2961 *--p = 'a' + (index % unit);
2962 index = (index / unit) - 1;
2963 } while (index >= 0);
2965 memmove(begin, p, end - p);
2966 memcpy(buf, prefix, strlen(prefix));
2972 * The asynchronous part of sd_probe
2974 static void sd_probe_async(void *data, async_cookie_t cookie)
2976 struct scsi_disk *sdkp = data;
2977 struct scsi_device *sdp;
2984 index = sdkp->index;
2985 dev = &sdp->sdev_gendev;
2987 gd->major = sd_major((index & 0xf0) >> 4);
2988 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2989 gd->minors = SD_MINORS;
2991 gd->fops = &sd_fops;
2992 gd->private_data = &sdkp->driver;
2993 gd->queue = sdkp->device->request_queue;
2995 /* defaults, until the device tells us otherwise */
2996 sdp->sector_size = 512;
2998 sdkp->media_present = 1;
2999 sdkp->write_prot = 0;
3000 sdkp->cache_override = 0;
3004 sdkp->first_scan = 1;
3005 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3007 sd_revalidate_disk(gd);
3009 gd->driverfs_dev = &sdp->sdev_gendev;
3010 gd->flags = GENHD_FL_EXT_DEVT;
3011 if (sdp->removable) {
3012 gd->flags |= GENHD_FL_REMOVABLE;
3013 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3016 blk_pm_runtime_init(sdp->request_queue, dev);
3019 sd_dif_config_host(sdkp);
3021 sd_revalidate_disk(gd);
3023 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3024 sdp->removable ? "removable " : "");
3025 scsi_autopm_put_device(sdp);
3026 put_device(&sdkp->dev);
3030 * sd_probe - called during driver initialization and whenever a
3031 * new scsi device is attached to the system. It is called once
3032 * for each scsi device (not just disks) present.
3033 * @dev: pointer to device object
3035 * Returns 0 if successful (or not interested in this scsi device
3036 * (e.g. scanner)); 1 when there is an error.
3038 * Note: this function is invoked from the scsi mid-level.
3039 * This function sets up the mapping between a given
3040 * <host,channel,id,lun> (found in sdp) and new device name
3041 * (e.g. /dev/sda). More precisely it is the block device major
3042 * and minor number that is chosen here.
3044 * Assume sd_probe is not re-entrant (for time being)
3045 * Also think about sd_probe() and sd_remove() running coincidentally.
3047 static int sd_probe(struct device *dev)
3049 struct scsi_device *sdp = to_scsi_device(dev);
3050 struct scsi_disk *sdkp;
3055 scsi_autopm_get_device(sdp);
3057 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
3060 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3064 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3068 gd = alloc_disk(SD_MINORS);
3073 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3076 spin_lock(&sd_index_lock);
3077 error = ida_get_new(&sd_index_ida, &index);
3078 spin_unlock(&sd_index_lock);
3079 } while (error == -EAGAIN);
3082 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3086 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3088 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3089 goto out_free_index;
3093 sdkp->driver = &sd_template;
3095 sdkp->index = index;
3096 atomic_set(&sdkp->openers, 0);
3097 atomic_set(&sdkp->device->ioerr_cnt, 0);
3099 if (!sdp->request_queue->rq_timeout) {
3100 if (sdp->type != TYPE_MOD)
3101 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3103 blk_queue_rq_timeout(sdp->request_queue,
3107 device_initialize(&sdkp->dev);
3108 sdkp->dev.parent = dev;
3109 sdkp->dev.class = &sd_disk_class;
3110 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3112 error = device_add(&sdkp->dev);
3114 goto out_free_index;
3117 dev_set_drvdata(dev, sdkp);
3119 get_device(&sdkp->dev); /* prevent release before async_schedule */
3120 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3125 spin_lock(&sd_index_lock);
3126 ida_remove(&sd_index_ida, index);
3127 spin_unlock(&sd_index_lock);
3133 scsi_autopm_put_device(sdp);
3138 * sd_remove - called whenever a scsi disk (previously recognized by
3139 * sd_probe) is detached from the system. It is called (potentially
3140 * multiple times) during sd module unload.
3141 * @sdp: pointer to mid level scsi device object
3143 * Note: this function is invoked from the scsi mid-level.
3144 * This function potentially frees up a device name (e.g. /dev/sdc)
3145 * that could be re-used by a subsequent sd_probe().
3146 * This function is not called when the built-in sd driver is "exit-ed".
3148 static int sd_remove(struct device *dev)
3150 struct scsi_disk *sdkp;
3153 sdkp = dev_get_drvdata(dev);
3154 devt = disk_devt(sdkp->disk);
3155 scsi_autopm_get_device(sdkp->device);
3157 async_synchronize_full_domain(&scsi_sd_pm_domain);
3158 async_synchronize_full_domain(&scsi_sd_probe_domain);
3159 device_del(&sdkp->dev);
3160 del_gendisk(sdkp->disk);
3163 blk_register_region(devt, SD_MINORS, NULL,
3164 sd_default_probe, NULL, NULL);
3166 mutex_lock(&sd_ref_mutex);
3167 dev_set_drvdata(dev, NULL);
3168 put_device(&sdkp->dev);
3169 mutex_unlock(&sd_ref_mutex);
3175 * scsi_disk_release - Called to free the scsi_disk structure
3176 * @dev: pointer to embedded class device
3178 * sd_ref_mutex must be held entering this routine. Because it is
3179 * called on last put, you should always use the scsi_disk_get()
3180 * scsi_disk_put() helpers which manipulate the semaphore directly
3181 * and never do a direct put_device.
3183 static void scsi_disk_release(struct device *dev)
3185 struct scsi_disk *sdkp = to_scsi_disk(dev);
3186 struct gendisk *disk = sdkp->disk;
3188 spin_lock(&sd_index_lock);
3189 ida_remove(&sd_index_ida, sdkp->index);
3190 spin_unlock(&sd_index_lock);
3192 disk->private_data = NULL;
3194 put_device(&sdkp->device->sdev_gendev);
3199 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3201 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3202 struct scsi_sense_hdr sshdr;
3203 struct scsi_device *sdp = sdkp->device;
3207 cmd[4] |= 1; /* START */
3209 if (sdp->start_stop_pwr_cond)
3210 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3212 if (!scsi_device_online(sdp))
3215 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3216 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3218 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3219 if (driver_byte(res) & DRIVER_SENSE)
3220 sd_print_sense_hdr(sdkp, &sshdr);
3221 if (scsi_sense_valid(&sshdr) &&
3222 /* 0x3a is medium not present */
3227 /* SCSI error codes must not go to the generic layer */
3235 * Send a SYNCHRONIZE CACHE instruction down to the device through
3236 * the normal SCSI command structure. Wait for the command to
3239 static void sd_shutdown(struct device *dev)
3241 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3244 return; /* this can happen */
3246 if (pm_runtime_suspended(dev))
3249 if (sdkp->WCE && sdkp->media_present) {
3250 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3251 sd_sync_cache(sdkp);
3254 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3255 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3256 sd_start_stop_device(sdkp, 0);
3260 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3262 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3265 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3268 if (sdkp->WCE && sdkp->media_present) {
3269 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3270 ret = sd_sync_cache(sdkp);
3272 /* ignore OFFLINE device */
3279 if (sdkp->device->manage_start_stop) {
3280 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3281 /* an error is not worth aborting a system sleep */
3282 ret = sd_start_stop_device(sdkp, 0);
3283 if (ignore_stop_errors)
3291 static int sd_suspend_system(struct device *dev)
3293 return sd_suspend_common(dev, true);
3296 static int sd_suspend_runtime(struct device *dev)
3298 return sd_suspend_common(dev, false);
3301 static int sd_resume(struct device *dev)
3303 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3305 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3308 if (!sdkp->device->manage_start_stop)
3311 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3312 return sd_start_stop_device(sdkp, 1);
3316 * init_sd - entry point for this driver (both when built in or when
3319 * Note: this function registers this driver with the scsi mid-level.
3321 static int __init init_sd(void)
3323 int majors = 0, i, err;
3325 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3327 for (i = 0; i < SD_MAJORS; i++) {
3328 if (register_blkdev(sd_major(i), "sd") != 0)
3331 blk_register_region(sd_major(i), SD_MINORS, NULL,
3332 sd_default_probe, NULL, NULL);
3338 err = class_register(&sd_disk_class);
3342 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3344 if (!sd_cdb_cache) {
3345 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3350 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3352 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3357 err = scsi_register_driver(&sd_template.gendrv);
3359 goto err_out_driver;
3364 mempool_destroy(sd_cdb_pool);
3367 kmem_cache_destroy(sd_cdb_cache);
3370 class_unregister(&sd_disk_class);
3372 for (i = 0; i < SD_MAJORS; i++)
3373 unregister_blkdev(sd_major(i), "sd");
3378 * exit_sd - exit point for this driver (when it is a module).
3380 * Note: this function unregisters this driver from the scsi mid-level.
3382 static void __exit exit_sd(void)
3386 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3388 scsi_unregister_driver(&sd_template.gendrv);
3389 mempool_destroy(sd_cdb_pool);
3390 kmem_cache_destroy(sd_cdb_cache);
3392 class_unregister(&sd_disk_class);
3394 for (i = 0; i < SD_MAJORS; i++) {
3395 blk_unregister_region(sd_major(i), SD_MINORS);
3396 unregister_blkdev(sd_major(i), "sd");
3400 module_init(init_sd);
3401 module_exit(exit_sd);
3403 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3404 struct scsi_sense_hdr *sshdr)
3406 scsi_print_sense_hdr(sdkp->device,
3407 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3410 static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3413 const char *hb_string = scsi_hostbyte_string(result);
3414 const char *db_string = scsi_driverbyte_string(result);
3416 if (hb_string || db_string)
3417 sd_printk(KERN_INFO, sdkp,
3418 "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3419 hb_string ? hb_string : "invalid",
3420 db_string ? db_string : "invalid");
3422 sd_printk(KERN_INFO, sdkp,
3423 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3424 msg, host_byte(result), driver_byte(result));