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>
54 #include <asm/uaccess.h>
55 #include <asm/unaligned.h>
57 #include <scsi/scsi.h>
58 #include <scsi/scsi_cmnd.h>
59 #include <scsi/scsi_dbg.h>
60 #include <scsi/scsi_device.h>
61 #include <scsi/scsi_driver.h>
62 #include <scsi/scsi_eh.h>
63 #include <scsi/scsi_host.h>
64 #include <scsi/scsi_ioctl.h>
65 #include <scsi/scsicam.h>
68 #include "scsi_priv.h"
69 #include "scsi_logging.h"
71 MODULE_AUTHOR("Eric Youngdale");
72 MODULE_DESCRIPTION("SCSI disk (sd) driver");
73 MODULE_LICENSE("GPL");
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
95 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
101 static void sd_config_discard(struct scsi_disk *, unsigned int);
102 static void sd_config_write_same(struct scsi_disk *);
103 static int sd_revalidate_disk(struct gendisk *);
104 static void sd_unlock_native_capacity(struct gendisk *disk);
105 static int sd_probe(struct device *);
106 static int sd_remove(struct device *);
107 static void sd_shutdown(struct device *);
108 static int sd_suspend_system(struct device *);
109 static int sd_suspend_runtime(struct device *);
110 static int sd_resume(struct device *);
111 static void sd_rescan(struct device *);
112 static int sd_init_command(struct scsi_cmnd *SCpnt);
113 static void sd_uninit_command(struct scsi_cmnd *SCpnt);
114 static int sd_done(struct scsi_cmnd *);
115 static int sd_eh_action(struct scsi_cmnd *, int);
116 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
117 static void scsi_disk_release(struct device *cdev);
118 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
119 static void sd_print_result(struct scsi_disk *, int);
121 static DEFINE_SPINLOCK(sd_index_lock);
122 static DEFINE_IDA(sd_index_ida);
124 /* This semaphore is used to mediate the 0->1 reference get in the
125 * face of object destruction (i.e. we can't allow a get on an
126 * object after last put) */
127 static DEFINE_MUTEX(sd_ref_mutex);
129 static struct kmem_cache *sd_cdb_cache;
130 static mempool_t *sd_cdb_pool;
132 static const char *sd_cache_types[] = {
133 "write through", "none", "write back",
134 "write back, no read (daft)"
137 static void sd_set_flush_flag(struct scsi_disk *sdkp)
147 blk_queue_flush(sdkp->disk->queue, flush);
151 cache_type_store(struct device *dev, struct device_attribute *attr,
152 const char *buf, size_t count)
154 int i, ct = -1, rcd, wce, sp;
155 struct scsi_disk *sdkp = to_scsi_disk(dev);
156 struct scsi_device *sdp = sdkp->device;
159 struct scsi_mode_data data;
160 struct scsi_sense_hdr sshdr;
161 static const char temp[] = "temporary ";
164 if (sdp->type != TYPE_DISK)
165 /* no cache control on RBC devices; theoretically they
166 * can do it, but there's probably so many exceptions
167 * it's not worth the risk */
170 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
171 buf += sizeof(temp) - 1;
172 sdkp->cache_override = 1;
174 sdkp->cache_override = 0;
177 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
178 len = strlen(sd_cache_types[i]);
179 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
187 rcd = ct & 0x01 ? 1 : 0;
188 wce = ct & 0x02 ? 1 : 0;
190 if (sdkp->cache_override) {
193 sd_set_flush_flag(sdkp);
197 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
198 SD_MAX_RETRIES, &data, NULL))
200 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
201 data.block_descriptor_length);
202 buffer_data = buffer + data.header_length +
203 data.block_descriptor_length;
204 buffer_data[2] &= ~0x05;
205 buffer_data[2] |= wce << 2 | rcd;
206 sp = buffer_data[0] & 0x80 ? 1 : 0;
208 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
209 SD_MAX_RETRIES, &data, &sshdr)) {
210 if (scsi_sense_valid(&sshdr))
211 sd_print_sense_hdr(sdkp, &sshdr);
214 revalidate_disk(sdkp->disk);
219 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
222 struct scsi_disk *sdkp = to_scsi_disk(dev);
223 struct scsi_device *sdp = sdkp->device;
225 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
229 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
230 const char *buf, size_t count)
232 struct scsi_disk *sdkp = to_scsi_disk(dev);
233 struct scsi_device *sdp = sdkp->device;
235 if (!capable(CAP_SYS_ADMIN))
238 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
242 static DEVICE_ATTR_RW(manage_start_stop);
245 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
247 struct scsi_disk *sdkp = to_scsi_disk(dev);
249 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
253 allow_restart_store(struct device *dev, struct device_attribute *attr,
254 const char *buf, size_t count)
256 struct scsi_disk *sdkp = to_scsi_disk(dev);
257 struct scsi_device *sdp = sdkp->device;
259 if (!capable(CAP_SYS_ADMIN))
262 if (sdp->type != TYPE_DISK)
265 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
269 static DEVICE_ATTR_RW(allow_restart);
272 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
274 struct scsi_disk *sdkp = to_scsi_disk(dev);
275 int ct = sdkp->RCD + 2*sdkp->WCE;
277 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
279 static DEVICE_ATTR_RW(cache_type);
282 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
284 struct scsi_disk *sdkp = to_scsi_disk(dev);
286 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
288 static DEVICE_ATTR_RO(FUA);
291 protection_type_show(struct device *dev, struct device_attribute *attr,
294 struct scsi_disk *sdkp = to_scsi_disk(dev);
296 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
300 protection_type_store(struct device *dev, struct device_attribute *attr,
301 const char *buf, size_t count)
303 struct scsi_disk *sdkp = to_scsi_disk(dev);
307 if (!capable(CAP_SYS_ADMIN))
310 err = kstrtouint(buf, 10, &val);
315 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
316 sdkp->protection_type = val;
320 static DEVICE_ATTR_RW(protection_type);
323 protection_mode_show(struct device *dev, struct device_attribute *attr,
326 struct scsi_disk *sdkp = to_scsi_disk(dev);
327 struct scsi_device *sdp = sdkp->device;
328 unsigned int dif, dix;
330 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
331 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
333 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
339 return snprintf(buf, 20, "none\n");
341 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
343 static DEVICE_ATTR_RO(protection_mode);
346 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
348 struct scsi_disk *sdkp = to_scsi_disk(dev);
350 return snprintf(buf, 20, "%u\n", sdkp->ATO);
352 static DEVICE_ATTR_RO(app_tag_own);
355 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
358 struct scsi_disk *sdkp = to_scsi_disk(dev);
360 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
362 static DEVICE_ATTR_RO(thin_provisioning);
364 static const char *lbp_mode[] = {
365 [SD_LBP_FULL] = "full",
366 [SD_LBP_UNMAP] = "unmap",
367 [SD_LBP_WS16] = "writesame_16",
368 [SD_LBP_WS10] = "writesame_10",
369 [SD_LBP_ZERO] = "writesame_zero",
370 [SD_LBP_DISABLE] = "disabled",
374 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
377 struct scsi_disk *sdkp = to_scsi_disk(dev);
379 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
383 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
384 const char *buf, size_t count)
386 struct scsi_disk *sdkp = to_scsi_disk(dev);
387 struct scsi_device *sdp = sdkp->device;
389 if (!capable(CAP_SYS_ADMIN))
392 if (sdp->type != TYPE_DISK)
395 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
396 sd_config_discard(sdkp, SD_LBP_UNMAP);
397 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
398 sd_config_discard(sdkp, SD_LBP_WS16);
399 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
400 sd_config_discard(sdkp, SD_LBP_WS10);
401 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
402 sd_config_discard(sdkp, SD_LBP_ZERO);
403 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
404 sd_config_discard(sdkp, SD_LBP_DISABLE);
410 static DEVICE_ATTR_RW(provisioning_mode);
413 max_medium_access_timeouts_show(struct device *dev,
414 struct device_attribute *attr, char *buf)
416 struct scsi_disk *sdkp = to_scsi_disk(dev);
418 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
422 max_medium_access_timeouts_store(struct device *dev,
423 struct device_attribute *attr, const char *buf,
426 struct scsi_disk *sdkp = to_scsi_disk(dev);
429 if (!capable(CAP_SYS_ADMIN))
432 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
434 return err ? err : count;
436 static DEVICE_ATTR_RW(max_medium_access_timeouts);
439 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
442 struct scsi_disk *sdkp = to_scsi_disk(dev);
444 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
448 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
449 const char *buf, size_t count)
451 struct scsi_disk *sdkp = to_scsi_disk(dev);
452 struct scsi_device *sdp = sdkp->device;
456 if (!capable(CAP_SYS_ADMIN))
459 if (sdp->type != TYPE_DISK)
462 err = kstrtoul(buf, 10, &max);
468 sdp->no_write_same = 1;
469 else if (max <= SD_MAX_WS16_BLOCKS) {
470 sdp->no_write_same = 0;
471 sdkp->max_ws_blocks = max;
474 sd_config_write_same(sdkp);
478 static DEVICE_ATTR_RW(max_write_same_blocks);
480 static struct attribute *sd_disk_attrs[] = {
481 &dev_attr_cache_type.attr,
483 &dev_attr_allow_restart.attr,
484 &dev_attr_manage_start_stop.attr,
485 &dev_attr_protection_type.attr,
486 &dev_attr_protection_mode.attr,
487 &dev_attr_app_tag_own.attr,
488 &dev_attr_thin_provisioning.attr,
489 &dev_attr_provisioning_mode.attr,
490 &dev_attr_max_write_same_blocks.attr,
491 &dev_attr_max_medium_access_timeouts.attr,
494 ATTRIBUTE_GROUPS(sd_disk);
496 static struct class sd_disk_class = {
498 .owner = THIS_MODULE,
499 .dev_release = scsi_disk_release,
500 .dev_groups = sd_disk_groups,
503 static const struct dev_pm_ops sd_pm_ops = {
504 .suspend = sd_suspend_system,
506 .poweroff = sd_suspend_system,
507 .restore = sd_resume,
508 .runtime_suspend = sd_suspend_runtime,
509 .runtime_resume = sd_resume,
512 static struct scsi_driver sd_template = {
513 .owner = THIS_MODULE,
518 .shutdown = sd_shutdown,
522 .init_command = sd_init_command,
523 .uninit_command = sd_uninit_command,
525 .eh_action = sd_eh_action,
529 * Dummy kobj_map->probe function.
530 * The default ->probe function will call modprobe, which is
531 * pointless as this module is already loaded.
533 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
539 * Device no to disk mapping:
541 * major disc2 disc p1
542 * |............|.............|....|....| <- dev_t
545 * Inside a major, we have 16k disks, however mapped non-
546 * contiguously. The first 16 disks are for major0, the next
547 * ones with major1, ... Disk 256 is for major0 again, disk 272
549 * As we stay compatible with our numbering scheme, we can reuse
550 * the well-know SCSI majors 8, 65--71, 136--143.
552 static int sd_major(int major_idx)
556 return SCSI_DISK0_MAJOR;
558 return SCSI_DISK1_MAJOR + major_idx - 1;
560 return SCSI_DISK8_MAJOR + major_idx - 8;
563 return 0; /* shut up gcc */
567 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
569 struct scsi_disk *sdkp = NULL;
571 if (disk->private_data) {
572 sdkp = scsi_disk(disk);
573 if (scsi_device_get(sdkp->device) == 0)
574 get_device(&sdkp->dev);
581 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
583 struct scsi_disk *sdkp;
585 mutex_lock(&sd_ref_mutex);
586 sdkp = __scsi_disk_get(disk);
587 mutex_unlock(&sd_ref_mutex);
591 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
593 struct scsi_disk *sdkp;
595 mutex_lock(&sd_ref_mutex);
596 sdkp = dev_get_drvdata(dev);
598 sdkp = __scsi_disk_get(sdkp->disk);
599 mutex_unlock(&sd_ref_mutex);
603 static void scsi_disk_put(struct scsi_disk *sdkp)
605 struct scsi_device *sdev = sdkp->device;
607 mutex_lock(&sd_ref_mutex);
608 put_device(&sdkp->dev);
609 scsi_device_put(sdev);
610 mutex_unlock(&sd_ref_mutex);
613 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
615 unsigned int prot_op = SCSI_PROT_NORMAL;
616 unsigned int dix = scsi_prot_sg_count(scmd);
618 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
620 prot_op = SCSI_PROT_READ_PASS;
621 else if (dif && !dix)
622 prot_op = SCSI_PROT_READ_STRIP;
623 else if (!dif && dix)
624 prot_op = SCSI_PROT_READ_INSERT;
627 prot_op = SCSI_PROT_WRITE_PASS;
628 else if (dif && !dix)
629 prot_op = SCSI_PROT_WRITE_INSERT;
630 else if (!dif && dix)
631 prot_op = SCSI_PROT_WRITE_STRIP;
634 scsi_set_prot_op(scmd, prot_op);
635 scsi_set_prot_type(scmd, dif);
638 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
640 struct request_queue *q = sdkp->disk->queue;
641 unsigned int logical_block_size = sdkp->device->sector_size;
642 unsigned int max_blocks = 0;
644 q->limits.discard_zeroes_data = sdkp->lbprz;
645 q->limits.discard_alignment = sdkp->unmap_alignment *
647 q->limits.discard_granularity =
648 max(sdkp->physical_block_size,
649 sdkp->unmap_granularity * logical_block_size);
651 sdkp->provisioning_mode = mode;
656 q->limits.max_discard_sectors = 0;
657 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
661 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
662 (u32)SD_MAX_WS16_BLOCKS);
666 max_blocks = min_not_zero(sdkp->max_ws_blocks,
667 (u32)SD_MAX_WS16_BLOCKS);
671 max_blocks = min_not_zero(sdkp->max_ws_blocks,
672 (u32)SD_MAX_WS10_BLOCKS);
676 max_blocks = min_not_zero(sdkp->max_ws_blocks,
677 (u32)SD_MAX_WS10_BLOCKS);
678 q->limits.discard_zeroes_data = 1;
682 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
683 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
687 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
688 * @sdp: scsi device to operate one
689 * @rq: Request to prepare
691 * Will issue either UNMAP or WRITE SAME(16) depending on preference
692 * indicated by target device.
694 static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
696 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
697 sector_t sector = blk_rq_pos(rq);
698 unsigned int nr_sectors = blk_rq_sectors(rq);
699 unsigned int nr_bytes = blk_rq_bytes(rq);
705 sector >>= ilog2(sdp->sector_size) - 9;
706 nr_sectors >>= ilog2(sdp->sector_size) - 9;
707 rq->timeout = SD_TIMEOUT;
709 memset(rq->cmd, 0, rq->cmd_len);
711 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
713 return BLKPREP_DEFER;
715 switch (sdkp->provisioning_mode) {
717 buf = page_address(page);
723 put_unaligned_be16(6 + 16, &buf[0]);
724 put_unaligned_be16(16, &buf[2]);
725 put_unaligned_be64(sector, &buf[8]);
726 put_unaligned_be32(nr_sectors, &buf[16]);
733 rq->cmd[0] = WRITE_SAME_16;
734 rq->cmd[1] = 0x8; /* UNMAP */
735 put_unaligned_be64(sector, &rq->cmd[2]);
736 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
738 len = sdkp->device->sector_size;
744 rq->cmd[0] = WRITE_SAME;
745 if (sdkp->provisioning_mode == SD_LBP_WS10)
746 rq->cmd[1] = 0x8; /* UNMAP */
747 put_unaligned_be32(sector, &rq->cmd[2]);
748 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
750 len = sdkp->device->sector_size;
758 rq->completion_data = page;
759 blk_add_request_payload(rq, page, len);
760 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
761 rq->__data_len = nr_bytes;
764 if (ret != BLKPREP_OK)
769 static void sd_config_write_same(struct scsi_disk *sdkp)
771 struct request_queue *q = sdkp->disk->queue;
772 unsigned int logical_block_size = sdkp->device->sector_size;
774 if (sdkp->device->no_write_same) {
775 sdkp->max_ws_blocks = 0;
779 /* Some devices can not handle block counts above 0xffff despite
780 * supporting WRITE SAME(16). Consequently we default to 64k
781 * blocks per I/O unless the device explicitly advertises a
784 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
785 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
786 (u32)SD_MAX_WS16_BLOCKS);
787 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
788 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
789 (u32)SD_MAX_WS10_BLOCKS);
791 sdkp->device->no_write_same = 1;
792 sdkp->max_ws_blocks = 0;
796 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
797 (logical_block_size >> 9));
801 * sd_setup_write_same_cmnd - write the same data to multiple blocks
802 * @sdp: scsi device to operate one
803 * @rq: Request to prepare
805 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
806 * preference indicated by target device.
808 static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
810 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
811 struct bio *bio = rq->bio;
812 sector_t sector = blk_rq_pos(rq);
813 unsigned int nr_sectors = blk_rq_sectors(rq);
814 unsigned int nr_bytes = blk_rq_bytes(rq);
817 if (sdkp->device->no_write_same)
820 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
822 sector >>= ilog2(sdp->sector_size) - 9;
823 nr_sectors >>= ilog2(sdp->sector_size) - 9;
825 rq->__data_len = sdp->sector_size;
826 rq->timeout = SD_WRITE_SAME_TIMEOUT;
827 memset(rq->cmd, 0, rq->cmd_len);
829 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
831 rq->cmd[0] = WRITE_SAME_16;
832 put_unaligned_be64(sector, &rq->cmd[2]);
833 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
836 rq->cmd[0] = WRITE_SAME;
837 put_unaligned_be32(sector, &rq->cmd[2]);
838 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
841 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
842 rq->__data_len = nr_bytes;
847 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
849 rq->timeout *= SD_FLUSH_TIMEOUT_MULTIPLIER;
850 rq->retries = SD_MAX_RETRIES;
851 rq->cmd[0] = SYNCHRONIZE_CACHE;
854 return scsi_setup_blk_pc_cmnd(sdp, rq);
857 static void sd_uninit_command(struct scsi_cmnd *SCpnt)
859 struct request *rq = SCpnt->request;
861 if (rq->cmd_flags & REQ_DISCARD)
862 __free_page(rq->completion_data);
864 if (SCpnt->cmnd != rq->cmd) {
865 mempool_free(SCpnt->cmnd, sd_cdb_pool);
871 static int sd_init_command(struct scsi_cmnd *SCpnt)
873 struct request *rq = SCpnt->request;
874 struct scsi_device *sdp = SCpnt->device;
875 struct gendisk *disk = rq->rq_disk;
876 struct scsi_disk *sdkp;
877 sector_t block = blk_rq_pos(rq);
879 unsigned int this_count = blk_rq_sectors(rq);
881 unsigned char protect;
884 * Discard request come in as REQ_TYPE_FS but we turn them into
885 * block PC requests to make life easier.
887 if (rq->cmd_flags & REQ_DISCARD) {
888 ret = sd_setup_discard_cmnd(sdp, rq);
890 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
891 ret = sd_setup_write_same_cmnd(sdp, rq);
893 } else if (rq->cmd_flags & REQ_FLUSH) {
894 ret = scsi_setup_flush_cmnd(sdp, rq);
897 ret = scsi_init_io(SCpnt, GFP_ATOMIC);
898 if (ret != BLKPREP_OK)
901 sdkp = scsi_disk(disk);
903 /* from here on until we're complete, any goto out
904 * is used for a killable error condition */
908 scmd_printk(KERN_INFO, SCpnt,
909 "%s: block=%llu, count=%d\n",
910 __func__, (unsigned long long)block, this_count));
912 if (!sdp || !scsi_device_online(sdp) ||
913 block + blk_rq_sectors(rq) > get_capacity(disk)) {
914 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
915 "Finishing %u sectors\n",
916 blk_rq_sectors(rq)));
917 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
918 "Retry with 0x%p\n", SCpnt));
924 * quietly refuse to do anything to a changed disc until
925 * the changed bit has been reset
927 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
932 * Some SD card readers can't handle multi-sector accesses which touch
933 * the last one or two hardware sectors. Split accesses as needed.
935 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
936 (sdp->sector_size / 512);
938 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
939 if (block < threshold) {
940 /* Access up to the threshold but not beyond */
941 this_count = threshold - block;
943 /* Access only a single hardware sector */
944 this_count = sdp->sector_size / 512;
948 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
949 (unsigned long long)block));
952 * If we have a 1K hardware sectorsize, prevent access to single
953 * 512 byte sectors. In theory we could handle this - in fact
954 * the scsi cdrom driver must be able to handle this because
955 * we typically use 1K blocksizes, and cdroms typically have
956 * 2K hardware sectorsizes. Of course, things are simpler
957 * with the cdrom, since it is read-only. For performance
958 * reasons, the filesystems should be able to handle this
959 * and not force the scsi disk driver to use bounce buffers
962 if (sdp->sector_size == 1024) {
963 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
964 scmd_printk(KERN_ERR, SCpnt,
965 "Bad block number requested\n");
969 this_count = this_count >> 1;
972 if (sdp->sector_size == 2048) {
973 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
974 scmd_printk(KERN_ERR, SCpnt,
975 "Bad block number requested\n");
979 this_count = this_count >> 2;
982 if (sdp->sector_size == 4096) {
983 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
984 scmd_printk(KERN_ERR, SCpnt,
985 "Bad block number requested\n");
989 this_count = this_count >> 3;
992 if (rq_data_dir(rq) == WRITE) {
993 if (!sdp->writeable) {
996 SCpnt->cmnd[0] = WRITE_6;
997 SCpnt->sc_data_direction = DMA_TO_DEVICE;
999 if (blk_integrity_rq(rq))
1000 sd_dif_prepare(rq, block, sdp->sector_size);
1002 } else if (rq_data_dir(rq) == READ) {
1003 SCpnt->cmnd[0] = READ_6;
1004 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
1006 scmd_printk(KERN_ERR, SCpnt, "Unknown command %llx\n", (unsigned long long) rq->cmd_flags);
1010 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1011 "%s %d/%u 512 byte blocks.\n",
1012 (rq_data_dir(rq) == WRITE) ?
1013 "writing" : "reading", this_count,
1014 blk_rq_sectors(rq)));
1016 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
1017 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
1023 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1024 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1026 if (unlikely(SCpnt->cmnd == NULL)) {
1027 ret = BLKPREP_DEFER;
1031 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1032 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1033 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1034 SCpnt->cmnd[7] = 0x18;
1035 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1036 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1039 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1040 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1041 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1042 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1043 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1044 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1045 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1046 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1048 /* Expected Indirect LBA */
1049 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1050 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1051 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1052 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1054 /* Transfer length */
1055 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1056 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1057 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1058 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1059 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1060 SCpnt->cmnd[0] += READ_16 - READ_6;
1061 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1062 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1063 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1064 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1065 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1066 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1067 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1068 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1069 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1070 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1071 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1072 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1073 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1074 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1075 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1076 scsi_device_protection(SCpnt->device) ||
1077 SCpnt->device->use_10_for_rw) {
1078 SCpnt->cmnd[0] += READ_10 - READ_6;
1079 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1080 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1081 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1082 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1083 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1084 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1085 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1086 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1088 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1090 * This happens only if this drive failed
1091 * 10byte rw command with ILLEGAL_REQUEST
1092 * during operation and thus turned off
1095 scmd_printk(KERN_ERR, SCpnt,
1096 "FUA write on READ/WRITE(6) drive\n");
1100 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1101 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1102 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1103 SCpnt->cmnd[4] = (unsigned char) this_count;
1106 SCpnt->sdb.length = this_count * sdp->sector_size;
1108 /* If DIF or DIX is enabled, tell HBA how to handle request */
1109 if (host_dif || scsi_prot_sg_count(SCpnt))
1110 sd_prot_op(SCpnt, host_dif);
1113 * We shouldn't disconnect in the middle of a sector, so with a dumb
1114 * host adapter, it's safe to assume that we can at least transfer
1115 * this many bytes between each connect / disconnect.
1117 SCpnt->transfersize = sdp->sector_size;
1118 SCpnt->underflow = this_count << 9;
1119 SCpnt->allowed = SD_MAX_RETRIES;
1122 * This indicates that the command is ready from our end to be
1131 * sd_open - open a scsi disk device
1132 * @inode: only i_rdev member may be used
1133 * @filp: only f_mode and f_flags may be used
1135 * Returns 0 if successful. Returns a negated errno value in case
1138 * Note: This can be called from a user context (e.g. fsck(1) )
1139 * or from within the kernel (e.g. as a result of a mount(1) ).
1140 * In the latter case @inode and @filp carry an abridged amount
1141 * of information as noted above.
1143 * Locking: called with bdev->bd_mutex held.
1145 static int sd_open(struct block_device *bdev, fmode_t mode)
1147 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1148 struct scsi_device *sdev;
1154 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1156 sdev = sdkp->device;
1159 * If the device is in error recovery, wait until it is done.
1160 * If the device is offline, then disallow any access to it.
1163 if (!scsi_block_when_processing_errors(sdev))
1166 if (sdev->removable || sdkp->write_prot)
1167 check_disk_change(bdev);
1170 * If the drive is empty, just let the open fail.
1172 retval = -ENOMEDIUM;
1173 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1177 * If the device has the write protect tab set, have the open fail
1178 * if the user expects to be able to write to the thing.
1181 if (sdkp->write_prot && (mode & FMODE_WRITE))
1185 * It is possible that the disk changing stuff resulted in
1186 * the device being taken offline. If this is the case,
1187 * report this to the user, and don't pretend that the
1188 * open actually succeeded.
1191 if (!scsi_device_online(sdev))
1194 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1195 if (scsi_block_when_processing_errors(sdev))
1196 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1202 scsi_disk_put(sdkp);
1207 * sd_release - invoked when the (last) close(2) is called on this
1209 * @inode: only i_rdev member may be used
1210 * @filp: only f_mode and f_flags may be used
1214 * Note: may block (uninterruptible) if error recovery is underway
1217 * Locking: called with bdev->bd_mutex held.
1219 static void sd_release(struct gendisk *disk, fmode_t mode)
1221 struct scsi_disk *sdkp = scsi_disk(disk);
1222 struct scsi_device *sdev = sdkp->device;
1224 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1226 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1227 if (scsi_block_when_processing_errors(sdev))
1228 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1232 * XXX and what if there are packets in flight and this close()
1233 * XXX is followed by a "rmmod sd_mod"?
1236 scsi_disk_put(sdkp);
1239 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1241 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1242 struct scsi_device *sdp = sdkp->device;
1243 struct Scsi_Host *host = sdp->host;
1246 /* default to most commonly used values */
1247 diskinfo[0] = 0x40; /* 1 << 6 */
1248 diskinfo[1] = 0x20; /* 1 << 5 */
1249 diskinfo[2] = sdkp->capacity >> 11;
1251 /* override with calculated, extended default, or driver values */
1252 if (host->hostt->bios_param)
1253 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1255 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1257 geo->heads = diskinfo[0];
1258 geo->sectors = diskinfo[1];
1259 geo->cylinders = diskinfo[2];
1264 * sd_ioctl - process an ioctl
1265 * @inode: only i_rdev/i_bdev members may be used
1266 * @filp: only f_mode and f_flags may be used
1267 * @cmd: ioctl command number
1268 * @arg: this is third argument given to ioctl(2) system call.
1269 * Often contains a pointer.
1271 * Returns 0 if successful (some ioctls return positive numbers on
1272 * success as well). Returns a negated errno value in case of error.
1274 * Note: most ioctls are forward onto the block subsystem or further
1275 * down in the scsi subsystem.
1277 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1278 unsigned int cmd, unsigned long arg)
1280 struct gendisk *disk = bdev->bd_disk;
1281 struct scsi_disk *sdkp = scsi_disk(disk);
1282 struct scsi_device *sdp = sdkp->device;
1283 void __user *p = (void __user *)arg;
1286 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1287 "cmd=0x%x\n", disk->disk_name, cmd));
1289 error = scsi_verify_blk_ioctl(bdev, cmd);
1294 * If we are in the middle of error recovery, don't let anyone
1295 * else try and use this device. Also, if error recovery fails, it
1296 * may try and take the device offline, in which case all further
1297 * access to the device is prohibited.
1299 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1300 (mode & FMODE_NDELAY) != 0);
1301 if (!scsi_block_when_processing_errors(sdp) || !error)
1305 * Send SCSI addressing ioctls directly to mid level, send other
1306 * ioctls to block level and then onto mid level if they can't be
1310 case SCSI_IOCTL_GET_IDLUN:
1311 case SCSI_IOCTL_GET_BUS_NUMBER:
1312 error = scsi_ioctl(sdp, cmd, p);
1315 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1316 if (error != -ENOTTY)
1318 error = scsi_ioctl(sdp, cmd, p);
1325 static void set_media_not_present(struct scsi_disk *sdkp)
1327 if (sdkp->media_present)
1328 sdkp->device->changed = 1;
1330 if (sdkp->device->removable) {
1331 sdkp->media_present = 0;
1336 static int media_not_present(struct scsi_disk *sdkp,
1337 struct scsi_sense_hdr *sshdr)
1339 if (!scsi_sense_valid(sshdr))
1342 /* not invoked for commands that could return deferred errors */
1343 switch (sshdr->sense_key) {
1344 case UNIT_ATTENTION:
1346 /* medium not present */
1347 if (sshdr->asc == 0x3A) {
1348 set_media_not_present(sdkp);
1356 * sd_check_events - check media events
1357 * @disk: kernel device descriptor
1358 * @clearing: disk events currently being cleared
1360 * Returns mask of DISK_EVENT_*.
1362 * Note: this function is invoked from the block subsystem.
1364 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1366 struct scsi_disk *sdkp = scsi_disk(disk);
1367 struct scsi_device *sdp = sdkp->device;
1368 struct scsi_sense_hdr *sshdr = NULL;
1371 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1374 * If the device is offline, don't send any commands - just pretend as
1375 * if the command failed. If the device ever comes back online, we
1376 * can deal with it then. It is only because of unrecoverable errors
1377 * that we would ever take a device offline in the first place.
1379 if (!scsi_device_online(sdp)) {
1380 set_media_not_present(sdkp);
1385 * Using TEST_UNIT_READY enables differentiation between drive with
1386 * no cartridge loaded - NOT READY, drive with changed cartridge -
1387 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1389 * Drives that auto spin down. eg iomega jaz 1G, will be started
1390 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1391 * sd_revalidate() is called.
1395 if (scsi_block_when_processing_errors(sdp)) {
1396 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1397 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1401 /* failed to execute TUR, assume media not present */
1402 if (host_byte(retval)) {
1403 set_media_not_present(sdkp);
1407 if (media_not_present(sdkp, sshdr))
1411 * For removable scsi disk we have to recognise the presence
1412 * of a disk in the drive.
1414 if (!sdkp->media_present)
1416 sdkp->media_present = 1;
1419 * sdp->changed is set under the following conditions:
1421 * Medium present state has changed in either direction.
1422 * Device has indicated UNIT_ATTENTION.
1425 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1430 static int sd_sync_cache(struct scsi_disk *sdkp)
1433 struct scsi_device *sdp = sdkp->device;
1434 const int timeout = sdp->request_queue->rq_timeout
1435 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1436 struct scsi_sense_hdr sshdr;
1438 if (!scsi_device_online(sdp))
1441 for (retries = 3; retries > 0; --retries) {
1442 unsigned char cmd[10] = { 0 };
1444 cmd[0] = SYNCHRONIZE_CACHE;
1446 * Leave the rest of the command zero to indicate
1449 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1450 &sshdr, timeout, SD_MAX_RETRIES,
1457 sd_print_result(sdkp, res);
1459 if (driver_byte(res) & DRIVER_SENSE)
1460 sd_print_sense_hdr(sdkp, &sshdr);
1461 /* we need to evaluate the error return */
1462 if (scsi_sense_valid(&sshdr) &&
1463 (sshdr.asc == 0x3a || /* medium not present */
1464 sshdr.asc == 0x20)) /* invalid command */
1465 /* this is no error here */
1468 switch (host_byte(res)) {
1469 /* ignore errors due to racing a disconnection */
1470 case DID_BAD_TARGET:
1471 case DID_NO_CONNECT:
1473 /* signal the upper layer it might try again */
1477 case DID_SOFT_ERROR:
1486 static void sd_rescan(struct device *dev)
1488 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1491 revalidate_disk(sdkp->disk);
1492 scsi_disk_put(sdkp);
1497 #ifdef CONFIG_COMPAT
1499 * This gets directly called from VFS. When the ioctl
1500 * is not recognized we go back to the other translation paths.
1502 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1503 unsigned int cmd, unsigned long arg)
1505 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1508 ret = scsi_verify_blk_ioctl(bdev, cmd);
1513 * If we are in the middle of error recovery, don't let anyone
1514 * else try and use this device. Also, if error recovery fails, it
1515 * may try and take the device offline, in which case all further
1516 * access to the device is prohibited.
1518 if (!scsi_block_when_processing_errors(sdev))
1521 if (sdev->host->hostt->compat_ioctl) {
1522 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1528 * Let the static ioctl translation table take care of it.
1530 return -ENOIOCTLCMD;
1534 static const struct block_device_operations sd_fops = {
1535 .owner = THIS_MODULE,
1537 .release = sd_release,
1539 .getgeo = sd_getgeo,
1540 #ifdef CONFIG_COMPAT
1541 .compat_ioctl = sd_compat_ioctl,
1543 .check_events = sd_check_events,
1544 .revalidate_disk = sd_revalidate_disk,
1545 .unlock_native_capacity = sd_unlock_native_capacity,
1549 * sd_eh_action - error handling callback
1550 * @scmd: sd-issued command that has failed
1551 * @eh_disp: The recovery disposition suggested by the midlayer
1553 * This function is called by the SCSI midlayer upon completion of an
1554 * error test command (currently TEST UNIT READY). The result of sending
1555 * the eh command is passed in eh_disp. We're looking for devices that
1556 * fail medium access commands but are OK with non access commands like
1557 * test unit ready (so wrongly see the device as having a successful
1560 static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1562 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1564 if (!scsi_device_online(scmd->device) ||
1565 !scsi_medium_access_command(scmd) ||
1566 host_byte(scmd->result) != DID_TIME_OUT ||
1571 * The device has timed out executing a medium access command.
1572 * However, the TEST UNIT READY command sent during error
1573 * handling completed successfully. Either the device is in the
1574 * process of recovering or has it suffered an internal failure
1575 * that prevents access to the storage medium.
1577 sdkp->medium_access_timed_out++;
1580 * If the device keeps failing read/write commands but TEST UNIT
1581 * READY always completes successfully we assume that medium
1582 * access is no longer possible and take the device offline.
1584 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1585 scmd_printk(KERN_ERR, scmd,
1586 "Medium access timeout failure. Offlining disk!\n");
1587 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1595 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1597 u64 start_lba = blk_rq_pos(scmd->request);
1598 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1602 * resid is optional but mostly filled in. When it's unused,
1603 * its value is zero, so we assume the whole buffer transferred
1605 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1606 unsigned int good_bytes;
1608 if (scmd->request->cmd_type != REQ_TYPE_FS)
1611 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1612 SCSI_SENSE_BUFFERSIZE,
1617 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1620 if (scmd->device->sector_size < 512) {
1621 /* only legitimate sector_size here is 256 */
1625 /* be careful ... don't want any overflows */
1626 unsigned int factor = scmd->device->sector_size / 512;
1627 do_div(start_lba, factor);
1628 do_div(end_lba, factor);
1631 /* The bad lba was reported incorrectly, we have no idea where
1634 if (bad_lba < start_lba || bad_lba >= end_lba)
1637 /* This computation should always be done in terms of
1638 * the resolution of the device's medium.
1640 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1641 return min(good_bytes, transferred);
1645 * sd_done - bottom half handler: called when the lower level
1646 * driver has completed (successfully or otherwise) a scsi command.
1647 * @SCpnt: mid-level's per command structure.
1649 * Note: potentially run from within an ISR. Must not block.
1651 static int sd_done(struct scsi_cmnd *SCpnt)
1653 int result = SCpnt->result;
1654 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1655 struct scsi_sense_hdr sshdr;
1656 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1657 struct request *req = SCpnt->request;
1658 int sense_valid = 0;
1659 int sense_deferred = 0;
1660 unsigned char op = SCpnt->cmnd[0];
1661 unsigned char unmap = SCpnt->cmnd[1] & 8;
1663 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1665 good_bytes = blk_rq_bytes(req);
1666 scsi_set_resid(SCpnt, 0);
1669 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1674 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1676 sense_deferred = scsi_sense_is_deferred(&sshdr);
1678 #ifdef CONFIG_SCSI_LOGGING
1679 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1681 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1682 "sd_done: sb[respc,sk,asc,"
1683 "ascq]=%x,%x,%x,%x\n",
1684 sshdr.response_code,
1685 sshdr.sense_key, sshdr.asc,
1689 sdkp->medium_access_timed_out = 0;
1691 if (driver_byte(result) != DRIVER_SENSE &&
1692 (!sense_valid || sense_deferred))
1695 switch (sshdr.sense_key) {
1696 case HARDWARE_ERROR:
1698 good_bytes = sd_completed_bytes(SCpnt);
1700 case RECOVERED_ERROR:
1701 good_bytes = scsi_bufflen(SCpnt);
1704 /* This indicates a false check condition, so ignore it. An
1705 * unknown amount of data was transferred so treat it as an
1708 scsi_print_sense("sd", SCpnt);
1710 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1712 case ABORTED_COMMAND:
1713 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1714 good_bytes = sd_completed_bytes(SCpnt);
1716 case ILLEGAL_REQUEST:
1717 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1718 good_bytes = sd_completed_bytes(SCpnt);
1719 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1720 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1723 sd_config_discard(sdkp, SD_LBP_DISABLE);
1728 sd_config_discard(sdkp, SD_LBP_DISABLE);
1730 sdkp->device->no_write_same = 1;
1731 sd_config_write_same(sdkp);
1734 req->__data_len = blk_rq_bytes(req);
1735 req->cmd_flags |= REQ_QUIET;
1744 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1745 sd_dif_complete(SCpnt, good_bytes);
1751 * spinup disk - called only in sd_revalidate_disk()
1754 sd_spinup_disk(struct scsi_disk *sdkp)
1756 unsigned char cmd[10];
1757 unsigned long spintime_expire = 0;
1758 int retries, spintime;
1759 unsigned int the_result;
1760 struct scsi_sense_hdr sshdr;
1761 int sense_valid = 0;
1765 /* Spin up drives, as required. Only do this at boot time */
1766 /* Spinup needs to be done for module loads too. */
1771 cmd[0] = TEST_UNIT_READY;
1772 memset((void *) &cmd[1], 0, 9);
1774 the_result = scsi_execute_req(sdkp->device, cmd,
1777 SD_MAX_RETRIES, NULL);
1780 * If the drive has indicated to us that it
1781 * doesn't have any media in it, don't bother
1782 * with any more polling.
1784 if (media_not_present(sdkp, &sshdr))
1788 sense_valid = scsi_sense_valid(&sshdr);
1790 } while (retries < 3 &&
1791 (!scsi_status_is_good(the_result) ||
1792 ((driver_byte(the_result) & DRIVER_SENSE) &&
1793 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1795 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1796 /* no sense, TUR either succeeded or failed
1797 * with a status error */
1798 if(!spintime && !scsi_status_is_good(the_result)) {
1799 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1800 sd_print_result(sdkp, the_result);
1806 * The device does not want the automatic start to be issued.
1808 if (sdkp->device->no_start_on_add)
1811 if (sense_valid && sshdr.sense_key == NOT_READY) {
1812 if (sshdr.asc == 4 && sshdr.ascq == 3)
1813 break; /* manual intervention required */
1814 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1815 break; /* standby */
1816 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1817 break; /* unavailable */
1819 * Issue command to spin up drive when not ready
1822 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1823 cmd[0] = START_STOP;
1824 cmd[1] = 1; /* Return immediately */
1825 memset((void *) &cmd[2], 0, 8);
1826 cmd[4] = 1; /* Start spin cycle */
1827 if (sdkp->device->start_stop_pwr_cond)
1829 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1831 SD_TIMEOUT, SD_MAX_RETRIES,
1833 spintime_expire = jiffies + 100 * HZ;
1836 /* Wait 1 second for next try */
1841 * Wait for USB flash devices with slow firmware.
1842 * Yes, this sense key/ASC combination shouldn't
1843 * occur here. It's characteristic of these devices.
1845 } else if (sense_valid &&
1846 sshdr.sense_key == UNIT_ATTENTION &&
1847 sshdr.asc == 0x28) {
1849 spintime_expire = jiffies + 5 * HZ;
1852 /* Wait 1 second for next try */
1855 /* we don't understand the sense code, so it's
1856 * probably pointless to loop */
1858 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1859 sd_print_sense_hdr(sdkp, &sshdr);
1864 } while (spintime && time_before_eq(jiffies, spintime_expire));
1867 if (scsi_status_is_good(the_result))
1870 printk("not responding...\n");
1876 * Determine whether disk supports Data Integrity Field.
1878 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1880 struct scsi_device *sdp = sdkp->device;
1884 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1887 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1889 if (type > SD_DIF_TYPE3_PROTECTION)
1891 else if (scsi_host_dif_capable(sdp->host, type))
1894 if (sdkp->first_scan || type != sdkp->protection_type)
1897 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1898 " protection type %u. Disabling disk!\n",
1902 sd_printk(KERN_NOTICE, sdkp,
1903 "Enabling DIF Type %u protection\n", type);
1906 sd_printk(KERN_NOTICE, sdkp,
1907 "Disabling DIF Type %u protection\n", type);
1911 sdkp->protection_type = type;
1916 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1917 struct scsi_sense_hdr *sshdr, int sense_valid,
1920 sd_print_result(sdkp, the_result);
1921 if (driver_byte(the_result) & DRIVER_SENSE)
1922 sd_print_sense_hdr(sdkp, sshdr);
1924 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1927 * Set dirty bit for removable devices if not ready -
1928 * sometimes drives will not report this properly.
1930 if (sdp->removable &&
1931 sense_valid && sshdr->sense_key == NOT_READY)
1932 set_media_not_present(sdkp);
1935 * We used to set media_present to 0 here to indicate no media
1936 * in the drive, but some drives fail read capacity even with
1937 * media present, so we can't do that.
1939 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1943 #if RC16_LEN > SD_BUF_SIZE
1944 #error RC16_LEN must not be more than SD_BUF_SIZE
1947 #define READ_CAPACITY_RETRIES_ON_RESET 10
1949 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1950 unsigned char *buffer)
1952 unsigned char cmd[16];
1953 struct scsi_sense_hdr sshdr;
1954 int sense_valid = 0;
1956 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1957 unsigned int alignment;
1958 unsigned long long lba;
1959 unsigned sector_size;
1961 if (sdp->no_read_capacity_16)
1966 cmd[0] = SERVICE_ACTION_IN;
1967 cmd[1] = SAI_READ_CAPACITY_16;
1969 memset(buffer, 0, RC16_LEN);
1971 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1972 buffer, RC16_LEN, &sshdr,
1973 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1975 if (media_not_present(sdkp, &sshdr))
1979 sense_valid = scsi_sense_valid(&sshdr);
1981 sshdr.sense_key == ILLEGAL_REQUEST &&
1982 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1984 /* Invalid Command Operation Code or
1985 * Invalid Field in CDB, just retry
1986 * silently with RC10 */
1989 sshdr.sense_key == UNIT_ATTENTION &&
1990 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1991 /* Device reset might occur several times,
1992 * give it one more chance */
1993 if (--reset_retries > 0)
1998 } while (the_result && retries);
2001 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
2002 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2006 sector_size = get_unaligned_be32(&buffer[8]);
2007 lba = get_unaligned_be64(&buffer[0]);
2009 if (sd_read_protection_type(sdkp, buffer) < 0) {
2014 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
2015 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2016 "kernel compiled with support for large block "
2022 /* Logical blocks per physical block exponent */
2023 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2025 /* Lowest aligned logical block */
2026 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2027 blk_queue_alignment_offset(sdp->request_queue, alignment);
2028 if (alignment && sdkp->first_scan)
2029 sd_printk(KERN_NOTICE, sdkp,
2030 "physical block alignment offset: %u\n", alignment);
2032 if (buffer[14] & 0x80) { /* LBPME */
2035 if (buffer[14] & 0x40) /* LBPRZ */
2038 sd_config_discard(sdkp, SD_LBP_WS16);
2041 sdkp->capacity = lba + 1;
2045 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2046 unsigned char *buffer)
2048 unsigned char cmd[16];
2049 struct scsi_sense_hdr sshdr;
2050 int sense_valid = 0;
2052 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2054 unsigned sector_size;
2057 cmd[0] = READ_CAPACITY;
2058 memset(&cmd[1], 0, 9);
2059 memset(buffer, 0, 8);
2061 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2063 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2065 if (media_not_present(sdkp, &sshdr))
2069 sense_valid = scsi_sense_valid(&sshdr);
2071 sshdr.sense_key == UNIT_ATTENTION &&
2072 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2073 /* Device reset might occur several times,
2074 * give it one more chance */
2075 if (--reset_retries > 0)
2080 } while (the_result && retries);
2083 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2084 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2088 sector_size = get_unaligned_be32(&buffer[4]);
2089 lba = get_unaligned_be32(&buffer[0]);
2091 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2092 /* Some buggy (usb cardreader) devices return an lba of
2093 0xffffffff when the want to report a size of 0 (with
2094 which they really mean no media is present) */
2096 sdkp->physical_block_size = sector_size;
2100 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2101 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2102 "kernel compiled with support for large block "
2108 sdkp->capacity = lba + 1;
2109 sdkp->physical_block_size = sector_size;
2113 static int sd_try_rc16_first(struct scsi_device *sdp)
2115 if (sdp->host->max_cmd_len < 16)
2117 if (sdp->try_rc_10_first)
2119 if (sdp->scsi_level > SCSI_SPC_2)
2121 if (scsi_device_protection(sdp))
2127 * read disk capacity
2130 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2133 struct scsi_device *sdp = sdkp->device;
2134 sector_t old_capacity = sdkp->capacity;
2136 if (sd_try_rc16_first(sdp)) {
2137 sector_size = read_capacity_16(sdkp, sdp, buffer);
2138 if (sector_size == -EOVERFLOW)
2140 if (sector_size == -ENODEV)
2142 if (sector_size < 0)
2143 sector_size = read_capacity_10(sdkp, sdp, buffer);
2144 if (sector_size < 0)
2147 sector_size = read_capacity_10(sdkp, sdp, buffer);
2148 if (sector_size == -EOVERFLOW)
2150 if (sector_size < 0)
2152 if ((sizeof(sdkp->capacity) > 4) &&
2153 (sdkp->capacity > 0xffffffffULL)) {
2154 int old_sector_size = sector_size;
2155 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2156 "Trying to use READ CAPACITY(16).\n");
2157 sector_size = read_capacity_16(sdkp, sdp, buffer);
2158 if (sector_size < 0) {
2159 sd_printk(KERN_NOTICE, sdkp,
2160 "Using 0xffffffff as device size\n");
2161 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2162 sector_size = old_sector_size;
2168 /* Some devices are known to return the total number of blocks,
2169 * not the highest block number. Some devices have versions
2170 * which do this and others which do not. Some devices we might
2171 * suspect of doing this but we don't know for certain.
2173 * If we know the reported capacity is wrong, decrement it. If
2174 * we can only guess, then assume the number of blocks is even
2175 * (usually true but not always) and err on the side of lowering
2178 if (sdp->fix_capacity ||
2179 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2180 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2181 "from its reported value: %llu\n",
2182 (unsigned long long) sdkp->capacity);
2187 if (sector_size == 0) {
2189 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2193 if (sector_size != 512 &&
2194 sector_size != 1024 &&
2195 sector_size != 2048 &&
2196 sector_size != 4096 &&
2197 sector_size != 256) {
2198 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2201 * The user might want to re-format the drive with
2202 * a supported sectorsize. Once this happens, it
2203 * would be relatively trivial to set the thing up.
2204 * For this reason, we leave the thing in the table.
2208 * set a bogus sector size so the normal read/write
2209 * logic in the block layer will eventually refuse any
2210 * request on this device without tripping over power
2211 * of two sector size assumptions
2215 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2218 char cap_str_2[10], cap_str_10[10];
2219 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2221 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2223 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2224 sizeof(cap_str_10));
2226 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2227 sd_printk(KERN_NOTICE, sdkp,
2228 "%llu %d-byte logical blocks: (%s/%s)\n",
2229 (unsigned long long)sdkp->capacity,
2230 sector_size, cap_str_10, cap_str_2);
2232 if (sdkp->physical_block_size != sector_size)
2233 sd_printk(KERN_NOTICE, sdkp,
2234 "%u-byte physical blocks\n",
2235 sdkp->physical_block_size);
2239 if (sdkp->capacity > 0xffffffff) {
2240 sdp->use_16_for_rw = 1;
2241 sdkp->max_xfer_blocks = SD_MAX_XFER_BLOCKS;
2243 sdkp->max_xfer_blocks = SD_DEF_XFER_BLOCKS;
2245 /* Rescale capacity to 512-byte units */
2246 if (sector_size == 4096)
2247 sdkp->capacity <<= 3;
2248 else if (sector_size == 2048)
2249 sdkp->capacity <<= 2;
2250 else if (sector_size == 1024)
2251 sdkp->capacity <<= 1;
2252 else if (sector_size == 256)
2253 sdkp->capacity >>= 1;
2255 blk_queue_physical_block_size(sdp->request_queue,
2256 sdkp->physical_block_size);
2257 sdkp->device->sector_size = sector_size;
2260 /* called with buffer of length 512 */
2262 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2263 unsigned char *buffer, int len, struct scsi_mode_data *data,
2264 struct scsi_sense_hdr *sshdr)
2266 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2267 SD_TIMEOUT, SD_MAX_RETRIES, data,
2272 * read write protect setting, if possible - called only in sd_revalidate_disk()
2273 * called with buffer of length SD_BUF_SIZE
2276 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2279 struct scsi_device *sdp = sdkp->device;
2280 struct scsi_mode_data data;
2281 int old_wp = sdkp->write_prot;
2283 set_disk_ro(sdkp->disk, 0);
2284 if (sdp->skip_ms_page_3f) {
2285 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2289 if (sdp->use_192_bytes_for_3f) {
2290 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2293 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2294 * We have to start carefully: some devices hang if we ask
2295 * for more than is available.
2297 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2300 * Second attempt: ask for page 0 When only page 0 is
2301 * implemented, a request for page 3F may return Sense Key
2302 * 5: Illegal Request, Sense Code 24: Invalid field in
2305 if (!scsi_status_is_good(res))
2306 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2309 * Third attempt: ask 255 bytes, as we did earlier.
2311 if (!scsi_status_is_good(res))
2312 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2316 if (!scsi_status_is_good(res)) {
2317 sd_first_printk(KERN_WARNING, sdkp,
2318 "Test WP failed, assume Write Enabled\n");
2320 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2321 set_disk_ro(sdkp->disk, sdkp->write_prot);
2322 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2323 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2324 sdkp->write_prot ? "on" : "off");
2325 sd_printk(KERN_DEBUG, sdkp,
2326 "Mode Sense: %02x %02x %02x %02x\n",
2327 buffer[0], buffer[1], buffer[2], buffer[3]);
2333 * sd_read_cache_type - called only from sd_revalidate_disk()
2334 * called with buffer of length SD_BUF_SIZE
2337 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2340 struct scsi_device *sdp = sdkp->device;
2345 struct scsi_mode_data data;
2346 struct scsi_sense_hdr sshdr;
2347 int old_wce = sdkp->WCE;
2348 int old_rcd = sdkp->RCD;
2349 int old_dpofua = sdkp->DPOFUA;
2352 if (sdkp->cache_override)
2356 if (sdp->skip_ms_page_8) {
2357 if (sdp->type == TYPE_RBC)
2360 if (sdp->skip_ms_page_3f)
2363 if (sdp->use_192_bytes_for_3f)
2367 } else if (sdp->type == TYPE_RBC) {
2375 /* cautiously ask */
2376 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2379 if (!scsi_status_is_good(res))
2382 if (!data.header_length) {
2385 sd_first_printk(KERN_ERR, sdkp,
2386 "Missing header in MODE_SENSE response\n");
2389 /* that went OK, now ask for the proper length */
2393 * We're only interested in the first three bytes, actually.
2394 * But the data cache page is defined for the first 20.
2398 else if (len > SD_BUF_SIZE) {
2399 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2400 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2403 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2407 if (len > first_len)
2408 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2411 if (scsi_status_is_good(res)) {
2412 int offset = data.header_length + data.block_descriptor_length;
2414 while (offset < len) {
2415 u8 page_code = buffer[offset] & 0x3F;
2416 u8 spf = buffer[offset] & 0x40;
2418 if (page_code == 8 || page_code == 6) {
2419 /* We're interested only in the first 3 bytes.
2421 if (len - offset <= 2) {
2422 sd_first_printk(KERN_ERR, sdkp,
2423 "Incomplete mode parameter "
2427 modepage = page_code;
2431 /* Go to the next page */
2432 if (spf && len - offset > 3)
2433 offset += 4 + (buffer[offset+2] << 8) +
2435 else if (!spf && len - offset > 1)
2436 offset += 2 + buffer[offset+1];
2438 sd_first_printk(KERN_ERR, sdkp,
2440 "parameter data\n");
2446 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2450 if (modepage == 8) {
2451 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2452 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2454 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2458 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2459 if (sdp->broken_fua) {
2460 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2462 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2463 sd_first_printk(KERN_NOTICE, sdkp,
2464 "Uses READ/WRITE(6), disabling FUA\n");
2468 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2469 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2470 sd_printk(KERN_NOTICE, sdkp,
2471 "Write cache: %s, read cache: %s, %s\n",
2472 sdkp->WCE ? "enabled" : "disabled",
2473 sdkp->RCD ? "disabled" : "enabled",
2474 sdkp->DPOFUA ? "supports DPO and FUA"
2475 : "doesn't support DPO or FUA");
2481 if (scsi_sense_valid(&sshdr) &&
2482 sshdr.sense_key == ILLEGAL_REQUEST &&
2483 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2484 /* Invalid field in CDB */
2485 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2487 sd_first_printk(KERN_ERR, sdkp,
2488 "Asking for cache data failed\n");
2491 if (sdp->wce_default_on) {
2492 sd_first_printk(KERN_NOTICE, sdkp,
2493 "Assuming drive cache: write back\n");
2496 sd_first_printk(KERN_ERR, sdkp,
2497 "Assuming drive cache: write through\n");
2505 * The ATO bit indicates whether the DIF application tag is available
2506 * for use by the operating system.
2508 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2511 struct scsi_device *sdp = sdkp->device;
2512 struct scsi_mode_data data;
2513 struct scsi_sense_hdr sshdr;
2515 if (sdp->type != TYPE_DISK)
2518 if (sdkp->protection_type == 0)
2521 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2522 SD_MAX_RETRIES, &data, &sshdr);
2524 if (!scsi_status_is_good(res) || !data.header_length ||
2526 sd_first_printk(KERN_WARNING, sdkp,
2527 "getting Control mode page failed, assume no ATO\n");
2529 if (scsi_sense_valid(&sshdr))
2530 sd_print_sense_hdr(sdkp, &sshdr);
2535 offset = data.header_length + data.block_descriptor_length;
2537 if ((buffer[offset] & 0x3f) != 0x0a) {
2538 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2542 if ((buffer[offset + 5] & 0x80) == 0)
2551 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2552 * @disk: disk to query
2554 static void sd_read_block_limits(struct scsi_disk *sdkp)
2556 unsigned int sector_sz = sdkp->device->sector_size;
2557 const int vpd_len = 64;
2558 u32 max_xfer_length;
2559 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2562 /* Block Limits VPD */
2563 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2566 max_xfer_length = get_unaligned_be32(&buffer[8]);
2567 if (max_xfer_length)
2568 sdkp->max_xfer_blocks = max_xfer_length;
2570 blk_queue_io_min(sdkp->disk->queue,
2571 get_unaligned_be16(&buffer[6]) * sector_sz);
2572 blk_queue_io_opt(sdkp->disk->queue,
2573 get_unaligned_be32(&buffer[12]) * sector_sz);
2575 if (buffer[3] == 0x3c) {
2576 unsigned int lba_count, desc_count;
2578 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2583 lba_count = get_unaligned_be32(&buffer[20]);
2584 desc_count = get_unaligned_be32(&buffer[24]);
2586 if (lba_count && desc_count)
2587 sdkp->max_unmap_blocks = lba_count;
2589 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2591 if (buffer[32] & 0x80)
2592 sdkp->unmap_alignment =
2593 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2595 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2597 if (sdkp->max_unmap_blocks)
2598 sd_config_discard(sdkp, SD_LBP_UNMAP);
2600 sd_config_discard(sdkp, SD_LBP_WS16);
2602 } else { /* LBP VPD page tells us what to use */
2604 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2605 sd_config_discard(sdkp, SD_LBP_UNMAP);
2606 else if (sdkp->lbpws)
2607 sd_config_discard(sdkp, SD_LBP_WS16);
2608 else if (sdkp->lbpws10)
2609 sd_config_discard(sdkp, SD_LBP_WS10);
2611 sd_config_discard(sdkp, SD_LBP_DISABLE);
2620 * sd_read_block_characteristics - Query block dev. characteristics
2621 * @disk: disk to query
2623 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2625 unsigned char *buffer;
2627 const int vpd_len = 64;
2629 buffer = kmalloc(vpd_len, GFP_KERNEL);
2632 /* Block Device Characteristics VPD */
2633 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2636 rot = get_unaligned_be16(&buffer[4]);
2639 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2646 * sd_read_block_provisioning - Query provisioning VPD page
2647 * @disk: disk to query
2649 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2651 unsigned char *buffer;
2652 const int vpd_len = 8;
2654 if (sdkp->lbpme == 0)
2657 buffer = kmalloc(vpd_len, GFP_KERNEL);
2659 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2663 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2664 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2665 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2671 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2673 struct scsi_device *sdev = sdkp->device;
2675 if (sdev->host->no_write_same) {
2676 sdev->no_write_same = 1;
2681 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2682 /* too large values might cause issues with arcmsr */
2683 int vpd_buf_len = 64;
2685 sdev->no_report_opcodes = 1;
2687 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2688 * CODES is unsupported and the device has an ATA
2689 * Information VPD page (SAT).
2691 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2692 sdev->no_write_same = 1;
2695 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2698 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2702 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2705 * Although VPD inquiries can go to SCSI-2 type devices,
2706 * some USB ones crash on receiving them, and the pages
2707 * we currently ask for are for SPC-3 and beyond
2709 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2715 * sd_revalidate_disk - called the first time a new disk is seen,
2716 * performs disk spin up, read_capacity, etc.
2717 * @disk: struct gendisk we care about
2719 static int sd_revalidate_disk(struct gendisk *disk)
2721 struct scsi_disk *sdkp = scsi_disk(disk);
2722 struct scsi_device *sdp = sdkp->device;
2723 unsigned char *buffer;
2724 unsigned int max_xfer;
2726 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2727 "sd_revalidate_disk\n"));
2730 * If the device is offline, don't try and read capacity or any
2731 * of the other niceties.
2733 if (!scsi_device_online(sdp))
2736 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2738 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2739 "allocation failure.\n");
2743 sd_spinup_disk(sdkp);
2746 * Without media there is no reason to ask; moreover, some devices
2747 * react badly if we do.
2749 if (sdkp->media_present) {
2750 sd_read_capacity(sdkp, buffer);
2752 if (sd_try_extended_inquiry(sdp)) {
2753 sd_read_block_provisioning(sdkp);
2754 sd_read_block_limits(sdkp);
2755 sd_read_block_characteristics(sdkp);
2758 sd_read_write_protect_flag(sdkp, buffer);
2759 sd_read_cache_type(sdkp, buffer);
2760 sd_read_app_tag_own(sdkp, buffer);
2761 sd_read_write_same(sdkp, buffer);
2764 sdkp->first_scan = 0;
2767 * We now have all cache related info, determine how we deal
2768 * with flush requests.
2770 sd_set_flush_flag(sdkp);
2772 max_xfer = min_not_zero(queue_max_hw_sectors(sdkp->disk->queue),
2773 sdkp->max_xfer_blocks);
2774 max_xfer <<= ilog2(sdp->sector_size) - 9;
2775 blk_queue_max_hw_sectors(sdkp->disk->queue, max_xfer);
2776 set_capacity(disk, sdkp->capacity);
2777 sd_config_write_same(sdkp);
2785 * sd_unlock_native_capacity - unlock native capacity
2786 * @disk: struct gendisk to set capacity for
2788 * Block layer calls this function if it detects that partitions
2789 * on @disk reach beyond the end of the device. If the SCSI host
2790 * implements ->unlock_native_capacity() method, it's invoked to
2791 * give it a chance to adjust the device capacity.
2794 * Defined by block layer. Might sleep.
2796 static void sd_unlock_native_capacity(struct gendisk *disk)
2798 struct scsi_device *sdev = scsi_disk(disk)->device;
2800 if (sdev->host->hostt->unlock_native_capacity)
2801 sdev->host->hostt->unlock_native_capacity(sdev);
2805 * sd_format_disk_name - format disk name
2806 * @prefix: name prefix - ie. "sd" for SCSI disks
2807 * @index: index of the disk to format name for
2808 * @buf: output buffer
2809 * @buflen: length of the output buffer
2811 * SCSI disk names starts at sda. The 26th device is sdz and the
2812 * 27th is sdaa. The last one for two lettered suffix is sdzz
2813 * which is followed by sdaaa.
2815 * This is basically 26 base counting with one extra 'nil' entry
2816 * at the beginning from the second digit on and can be
2817 * determined using similar method as 26 base conversion with the
2818 * index shifted -1 after each digit is computed.
2824 * 0 on success, -errno on failure.
2826 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2828 const int base = 'z' - 'a' + 1;
2829 char *begin = buf + strlen(prefix);
2830 char *end = buf + buflen;
2840 *--p = 'a' + (index % unit);
2841 index = (index / unit) - 1;
2842 } while (index >= 0);
2844 memmove(begin, p, end - p);
2845 memcpy(buf, prefix, strlen(prefix));
2851 * The asynchronous part of sd_probe
2853 static void sd_probe_async(void *data, async_cookie_t cookie)
2855 struct scsi_disk *sdkp = data;
2856 struct scsi_device *sdp;
2863 index = sdkp->index;
2864 dev = &sdp->sdev_gendev;
2866 gd->major = sd_major((index & 0xf0) >> 4);
2867 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2868 gd->minors = SD_MINORS;
2870 gd->fops = &sd_fops;
2871 gd->private_data = &sdkp->driver;
2872 gd->queue = sdkp->device->request_queue;
2874 /* defaults, until the device tells us otherwise */
2875 sdp->sector_size = 512;
2877 sdkp->media_present = 1;
2878 sdkp->write_prot = 0;
2879 sdkp->cache_override = 0;
2883 sdkp->first_scan = 1;
2884 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2886 sd_revalidate_disk(gd);
2888 gd->driverfs_dev = &sdp->sdev_gendev;
2889 gd->flags = GENHD_FL_EXT_DEVT;
2890 if (sdp->removable) {
2891 gd->flags |= GENHD_FL_REMOVABLE;
2892 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2895 blk_pm_runtime_init(sdp->request_queue, dev);
2898 sd_dif_config_host(sdkp);
2900 sd_revalidate_disk(gd);
2902 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2903 sdp->removable ? "removable " : "");
2904 scsi_autopm_put_device(sdp);
2905 put_device(&sdkp->dev);
2909 * sd_probe - called during driver initialization and whenever a
2910 * new scsi device is attached to the system. It is called once
2911 * for each scsi device (not just disks) present.
2912 * @dev: pointer to device object
2914 * Returns 0 if successful (or not interested in this scsi device
2915 * (e.g. scanner)); 1 when there is an error.
2917 * Note: this function is invoked from the scsi mid-level.
2918 * This function sets up the mapping between a given
2919 * <host,channel,id,lun> (found in sdp) and new device name
2920 * (e.g. /dev/sda). More precisely it is the block device major
2921 * and minor number that is chosen here.
2923 * Assume sd_probe is not re-entrant (for time being)
2924 * Also think about sd_probe() and sd_remove() running coincidentally.
2926 static int sd_probe(struct device *dev)
2928 struct scsi_device *sdp = to_scsi_device(dev);
2929 struct scsi_disk *sdkp;
2935 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2938 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2942 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2946 gd = alloc_disk(SD_MINORS);
2951 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2954 spin_lock(&sd_index_lock);
2955 error = ida_get_new(&sd_index_ida, &index);
2956 spin_unlock(&sd_index_lock);
2957 } while (error == -EAGAIN);
2960 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2964 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2966 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2967 goto out_free_index;
2971 sdkp->driver = &sd_template;
2973 sdkp->index = index;
2974 atomic_set(&sdkp->openers, 0);
2975 atomic_set(&sdkp->device->ioerr_cnt, 0);
2977 if (!sdp->request_queue->rq_timeout) {
2978 if (sdp->type != TYPE_MOD)
2979 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2981 blk_queue_rq_timeout(sdp->request_queue,
2985 device_initialize(&sdkp->dev);
2986 sdkp->dev.parent = dev;
2987 sdkp->dev.class = &sd_disk_class;
2988 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
2990 if (device_add(&sdkp->dev))
2991 goto out_free_index;
2994 dev_set_drvdata(dev, sdkp);
2996 get_device(&sdkp->dev); /* prevent release before async_schedule */
2997 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3002 spin_lock(&sd_index_lock);
3003 ida_remove(&sd_index_ida, index);
3004 spin_unlock(&sd_index_lock);
3014 * sd_remove - called whenever a scsi disk (previously recognized by
3015 * sd_probe) is detached from the system. It is called (potentially
3016 * multiple times) during sd module unload.
3017 * @sdp: pointer to mid level scsi device object
3019 * Note: this function is invoked from the scsi mid-level.
3020 * This function potentially frees up a device name (e.g. /dev/sdc)
3021 * that could be re-used by a subsequent sd_probe().
3022 * This function is not called when the built-in sd driver is "exit-ed".
3024 static int sd_remove(struct device *dev)
3026 struct scsi_disk *sdkp;
3029 sdkp = dev_get_drvdata(dev);
3030 devt = disk_devt(sdkp->disk);
3031 scsi_autopm_get_device(sdkp->device);
3033 async_synchronize_full_domain(&scsi_sd_pm_domain);
3034 async_synchronize_full_domain(&scsi_sd_probe_domain);
3035 device_del(&sdkp->dev);
3036 del_gendisk(sdkp->disk);
3039 blk_register_region(devt, SD_MINORS, NULL,
3040 sd_default_probe, NULL, NULL);
3042 mutex_lock(&sd_ref_mutex);
3043 dev_set_drvdata(dev, NULL);
3044 put_device(&sdkp->dev);
3045 mutex_unlock(&sd_ref_mutex);
3051 * scsi_disk_release - Called to free the scsi_disk structure
3052 * @dev: pointer to embedded class device
3054 * sd_ref_mutex must be held entering this routine. Because it is
3055 * called on last put, you should always use the scsi_disk_get()
3056 * scsi_disk_put() helpers which manipulate the semaphore directly
3057 * and never do a direct put_device.
3059 static void scsi_disk_release(struct device *dev)
3061 struct scsi_disk *sdkp = to_scsi_disk(dev);
3062 struct gendisk *disk = sdkp->disk;
3064 spin_lock(&sd_index_lock);
3065 ida_remove(&sd_index_ida, sdkp->index);
3066 spin_unlock(&sd_index_lock);
3068 disk->private_data = NULL;
3070 put_device(&sdkp->device->sdev_gendev);
3075 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3077 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3078 struct scsi_sense_hdr sshdr;
3079 struct scsi_device *sdp = sdkp->device;
3083 cmd[4] |= 1; /* START */
3085 if (sdp->start_stop_pwr_cond)
3086 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3088 if (!scsi_device_online(sdp))
3091 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3092 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3094 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3095 sd_print_result(sdkp, res);
3096 if (driver_byte(res) & DRIVER_SENSE)
3097 sd_print_sense_hdr(sdkp, &sshdr);
3098 if (scsi_sense_valid(&sshdr) &&
3099 /* 0x3a is medium not present */
3104 /* SCSI error codes must not go to the generic layer */
3112 * Send a SYNCHRONIZE CACHE instruction down to the device through
3113 * the normal SCSI command structure. Wait for the command to
3116 static void sd_shutdown(struct device *dev)
3118 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3121 return; /* this can happen */
3123 if (pm_runtime_suspended(dev))
3126 if (sdkp->WCE && sdkp->media_present) {
3127 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3128 sd_sync_cache(sdkp);
3131 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3132 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3133 sd_start_stop_device(sdkp, 0);
3137 scsi_disk_put(sdkp);
3140 static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3142 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3146 return 0; /* this can happen */
3148 if (sdkp->WCE && sdkp->media_present) {
3149 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3150 ret = sd_sync_cache(sdkp);
3152 /* ignore OFFLINE device */
3159 if (sdkp->device->manage_start_stop) {
3160 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3161 /* an error is not worth aborting a system sleep */
3162 ret = sd_start_stop_device(sdkp, 0);
3163 if (ignore_stop_errors)
3168 scsi_disk_put(sdkp);
3172 static int sd_suspend_system(struct device *dev)
3174 return sd_suspend_common(dev, true);
3177 static int sd_suspend_runtime(struct device *dev)
3179 return sd_suspend_common(dev, false);
3182 static int sd_resume(struct device *dev)
3184 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3187 if (!sdkp->device->manage_start_stop)
3190 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3191 ret = sd_start_stop_device(sdkp, 1);
3194 scsi_disk_put(sdkp);
3199 * init_sd - entry point for this driver (both when built in or when
3202 * Note: this function registers this driver with the scsi mid-level.
3204 static int __init init_sd(void)
3206 int majors = 0, i, err;
3208 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3210 for (i = 0; i < SD_MAJORS; i++) {
3211 if (register_blkdev(sd_major(i), "sd") != 0)
3214 blk_register_region(sd_major(i), SD_MINORS, NULL,
3215 sd_default_probe, NULL, NULL);
3221 err = class_register(&sd_disk_class);
3225 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3227 if (!sd_cdb_cache) {
3228 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3233 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3235 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3240 err = scsi_register_driver(&sd_template.gendrv);
3242 goto err_out_driver;
3247 mempool_destroy(sd_cdb_pool);
3250 kmem_cache_destroy(sd_cdb_cache);
3253 class_unregister(&sd_disk_class);
3255 for (i = 0; i < SD_MAJORS; i++)
3256 unregister_blkdev(sd_major(i), "sd");
3261 * exit_sd - exit point for this driver (when it is a module).
3263 * Note: this function unregisters this driver from the scsi mid-level.
3265 static void __exit exit_sd(void)
3269 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3271 scsi_unregister_driver(&sd_template.gendrv);
3272 mempool_destroy(sd_cdb_pool);
3273 kmem_cache_destroy(sd_cdb_cache);
3275 class_unregister(&sd_disk_class);
3277 for (i = 0; i < SD_MAJORS; i++) {
3278 blk_unregister_region(sd_major(i), SD_MINORS);
3279 unregister_blkdev(sd_major(i), "sd");
3283 module_init(init_sd);
3284 module_exit(exit_sd);
3286 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3287 struct scsi_sense_hdr *sshdr)
3289 sd_printk(KERN_INFO, sdkp, " ");
3290 scsi_show_sense_hdr(sshdr);
3291 sd_printk(KERN_INFO, sdkp, " ");
3292 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3295 static void sd_print_result(struct scsi_disk *sdkp, int result)
3297 sd_printk(KERN_INFO, sdkp, " ");
3298 scsi_show_result(result);