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_logging.h"
70 MODULE_AUTHOR("Eric Youngdale");
71 MODULE_DESCRIPTION("SCSI disk (sd) driver");
72 MODULE_LICENSE("GPL");
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
94 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
100 static void sd_config_discard(struct scsi_disk *, unsigned int);
101 static int sd_revalidate_disk(struct gendisk *);
102 static void sd_unlock_native_capacity(struct gendisk *disk);
103 static int sd_probe(struct device *);
104 static int sd_remove(struct device *);
105 static void sd_shutdown(struct device *);
106 static int sd_suspend(struct device *, pm_message_t state);
107 static int sd_resume(struct device *);
108 static void sd_rescan(struct device *);
109 static int sd_done(struct scsi_cmnd *);
110 static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
111 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
112 static void scsi_disk_release(struct device *cdev);
113 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
114 static void sd_print_result(struct scsi_disk *, int);
116 static DEFINE_SPINLOCK(sd_index_lock);
117 static DEFINE_IDA(sd_index_ida);
119 /* This semaphore is used to mediate the 0->1 reference get in the
120 * face of object destruction (i.e. we can't allow a get on an
121 * object after last put) */
122 static DEFINE_MUTEX(sd_ref_mutex);
124 static struct kmem_cache *sd_cdb_cache;
125 static mempool_t *sd_cdb_pool;
127 static const char *sd_cache_types[] = {
128 "write through", "none", "write back",
129 "write back, no read (daft)"
133 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
134 const char *buf, size_t count)
136 int i, ct = -1, rcd, wce, sp;
137 struct scsi_disk *sdkp = to_scsi_disk(dev);
138 struct scsi_device *sdp = sdkp->device;
141 struct scsi_mode_data data;
142 struct scsi_sense_hdr sshdr;
145 if (sdp->type != TYPE_DISK)
146 /* no cache control on RBC devices; theoretically they
147 * can do it, but there's probably so many exceptions
148 * it's not worth the risk */
151 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
152 len = strlen(sd_cache_types[i]);
153 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
161 rcd = ct & 0x01 ? 1 : 0;
162 wce = ct & 0x02 ? 1 : 0;
163 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
164 SD_MAX_RETRIES, &data, NULL))
166 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
167 data.block_descriptor_length);
168 buffer_data = buffer + data.header_length +
169 data.block_descriptor_length;
170 buffer_data[2] &= ~0x05;
171 buffer_data[2] |= wce << 2 | rcd;
172 sp = buffer_data[0] & 0x80 ? 1 : 0;
174 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
175 SD_MAX_RETRIES, &data, &sshdr)) {
176 if (scsi_sense_valid(&sshdr))
177 sd_print_sense_hdr(sdkp, &sshdr);
180 revalidate_disk(sdkp->disk);
185 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
186 const char *buf, size_t count)
188 struct scsi_disk *sdkp = to_scsi_disk(dev);
189 struct scsi_device *sdp = sdkp->device;
191 if (!capable(CAP_SYS_ADMIN))
194 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
200 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
201 const char *buf, size_t count)
203 struct scsi_disk *sdkp = to_scsi_disk(dev);
204 struct scsi_device *sdp = sdkp->device;
206 if (!capable(CAP_SYS_ADMIN))
209 if (sdp->type != TYPE_DISK)
212 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
218 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
221 struct scsi_disk *sdkp = to_scsi_disk(dev);
222 int ct = sdkp->RCD + 2*sdkp->WCE;
224 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
228 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
230 struct scsi_disk *sdkp = to_scsi_disk(dev);
232 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
236 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
239 struct scsi_disk *sdkp = to_scsi_disk(dev);
240 struct scsi_device *sdp = sdkp->device;
242 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
246 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
249 struct scsi_disk *sdkp = to_scsi_disk(dev);
251 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
255 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
258 struct scsi_disk *sdkp = to_scsi_disk(dev);
260 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
264 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
267 struct scsi_disk *sdkp = to_scsi_disk(dev);
268 struct scsi_device *sdp = sdkp->device;
269 unsigned int dif, dix;
271 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
272 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
274 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
280 return snprintf(buf, 20, "none\n");
282 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
286 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
289 struct scsi_disk *sdkp = to_scsi_disk(dev);
291 return snprintf(buf, 20, "%u\n", sdkp->ATO);
295 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
298 struct scsi_disk *sdkp = to_scsi_disk(dev);
300 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
303 static const char *lbp_mode[] = {
304 [SD_LBP_FULL] = "full",
305 [SD_LBP_UNMAP] = "unmap",
306 [SD_LBP_WS16] = "writesame_16",
307 [SD_LBP_WS10] = "writesame_10",
308 [SD_LBP_ZERO] = "writesame_zero",
309 [SD_LBP_DISABLE] = "disabled",
313 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
316 struct scsi_disk *sdkp = to_scsi_disk(dev);
318 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
322 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
323 const char *buf, size_t count)
325 struct scsi_disk *sdkp = to_scsi_disk(dev);
326 struct scsi_device *sdp = sdkp->device;
328 if (!capable(CAP_SYS_ADMIN))
331 if (sdp->type != TYPE_DISK)
334 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
335 sd_config_discard(sdkp, SD_LBP_UNMAP);
336 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
337 sd_config_discard(sdkp, SD_LBP_WS16);
338 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
339 sd_config_discard(sdkp, SD_LBP_WS10);
340 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
341 sd_config_discard(sdkp, SD_LBP_ZERO);
342 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
343 sd_config_discard(sdkp, SD_LBP_DISABLE);
351 sd_show_max_medium_access_timeouts(struct device *dev,
352 struct device_attribute *attr, char *buf)
354 struct scsi_disk *sdkp = to_scsi_disk(dev);
356 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
360 sd_store_max_medium_access_timeouts(struct device *dev,
361 struct device_attribute *attr,
362 const char *buf, size_t count)
364 struct scsi_disk *sdkp = to_scsi_disk(dev);
367 if (!capable(CAP_SYS_ADMIN))
370 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
372 return err ? err : count;
375 static struct device_attribute sd_disk_attrs[] = {
376 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
377 sd_store_cache_type),
378 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
379 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
380 sd_store_allow_restart),
381 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
382 sd_store_manage_start_stop),
383 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
384 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
385 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
386 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
387 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
388 sd_store_provisioning_mode),
389 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
390 sd_show_max_medium_access_timeouts,
391 sd_store_max_medium_access_timeouts),
395 static struct class sd_disk_class = {
397 .owner = THIS_MODULE,
398 .dev_release = scsi_disk_release,
399 .dev_attrs = sd_disk_attrs,
402 static struct scsi_driver sd_template = {
403 .owner = THIS_MODULE,
408 .suspend = sd_suspend,
410 .shutdown = sd_shutdown,
414 .eh_action = sd_eh_action,
418 * Device no to disk mapping:
420 * major disc2 disc p1
421 * |............|.............|....|....| <- dev_t
424 * Inside a major, we have 16k disks, however mapped non-
425 * contiguously. The first 16 disks are for major0, the next
426 * ones with major1, ... Disk 256 is for major0 again, disk 272
428 * As we stay compatible with our numbering scheme, we can reuse
429 * the well-know SCSI majors 8, 65--71, 136--143.
431 static int sd_major(int major_idx)
435 return SCSI_DISK0_MAJOR;
437 return SCSI_DISK1_MAJOR + major_idx - 1;
439 return SCSI_DISK8_MAJOR + major_idx - 8;
442 return 0; /* shut up gcc */
446 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
448 struct scsi_disk *sdkp = NULL;
450 if (disk->private_data) {
451 sdkp = scsi_disk(disk);
452 if (scsi_device_get(sdkp->device) == 0)
453 get_device(&sdkp->dev);
460 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
462 struct scsi_disk *sdkp;
464 mutex_lock(&sd_ref_mutex);
465 sdkp = __scsi_disk_get(disk);
466 mutex_unlock(&sd_ref_mutex);
470 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
472 struct scsi_disk *sdkp;
474 mutex_lock(&sd_ref_mutex);
475 sdkp = dev_get_drvdata(dev);
477 sdkp = __scsi_disk_get(sdkp->disk);
478 mutex_unlock(&sd_ref_mutex);
482 static void scsi_disk_put(struct scsi_disk *sdkp)
484 struct scsi_device *sdev = sdkp->device;
486 mutex_lock(&sd_ref_mutex);
487 put_device(&sdkp->dev);
488 scsi_device_put(sdev);
489 mutex_unlock(&sd_ref_mutex);
492 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
494 unsigned int prot_op = SCSI_PROT_NORMAL;
495 unsigned int dix = scsi_prot_sg_count(scmd);
497 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
499 prot_op = SCSI_PROT_READ_PASS;
500 else if (dif && !dix)
501 prot_op = SCSI_PROT_READ_STRIP;
502 else if (!dif && dix)
503 prot_op = SCSI_PROT_READ_INSERT;
506 prot_op = SCSI_PROT_WRITE_PASS;
507 else if (dif && !dix)
508 prot_op = SCSI_PROT_WRITE_INSERT;
509 else if (!dif && dix)
510 prot_op = SCSI_PROT_WRITE_STRIP;
513 scsi_set_prot_op(scmd, prot_op);
514 scsi_set_prot_type(scmd, dif);
517 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
519 struct request_queue *q = sdkp->disk->queue;
520 unsigned int logical_block_size = sdkp->device->sector_size;
521 unsigned int max_blocks = 0;
523 q->limits.discard_zeroes_data = sdkp->lbprz;
524 q->limits.discard_alignment = sdkp->unmap_alignment *
526 q->limits.discard_granularity =
527 max(sdkp->physical_block_size,
528 sdkp->unmap_granularity * logical_block_size);
530 sdkp->provisioning_mode = mode;
535 q->limits.max_discard_sectors = 0;
536 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
540 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
544 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
548 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
552 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
553 q->limits.discard_zeroes_data = 1;
557 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
558 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
562 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
563 * @sdp: scsi device to operate one
564 * @rq: Request to prepare
566 * Will issue either UNMAP or WRITE SAME(16) depending on preference
567 * indicated by target device.
569 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
571 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
572 struct bio *bio = rq->bio;
573 sector_t sector = bio->bi_sector;
574 unsigned int nr_sectors = bio_sectors(bio);
580 if (sdkp->device->sector_size == 4096) {
585 rq->timeout = SD_TIMEOUT;
587 memset(rq->cmd, 0, rq->cmd_len);
589 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
591 return BLKPREP_DEFER;
593 switch (sdkp->provisioning_mode) {
595 buf = page_address(page);
601 put_unaligned_be16(6 + 16, &buf[0]);
602 put_unaligned_be16(16, &buf[2]);
603 put_unaligned_be64(sector, &buf[8]);
604 put_unaligned_be32(nr_sectors, &buf[16]);
611 rq->cmd[0] = WRITE_SAME_16;
612 rq->cmd[1] = 0x8; /* UNMAP */
613 put_unaligned_be64(sector, &rq->cmd[2]);
614 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
616 len = sdkp->device->sector_size;
622 rq->cmd[0] = WRITE_SAME;
623 if (sdkp->provisioning_mode == SD_LBP_WS10)
624 rq->cmd[1] = 0x8; /* UNMAP */
625 put_unaligned_be32(sector, &rq->cmd[2]);
626 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
628 len = sdkp->device->sector_size;
636 blk_add_request_payload(rq, page, len);
637 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
638 rq->buffer = page_address(page);
641 if (ret != BLKPREP_OK) {
648 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
650 rq->timeout = SD_FLUSH_TIMEOUT;
651 rq->retries = SD_MAX_RETRIES;
652 rq->cmd[0] = SYNCHRONIZE_CACHE;
655 return scsi_setup_blk_pc_cmnd(sdp, rq);
658 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
660 if (rq->cmd_flags & REQ_DISCARD) {
661 free_page((unsigned long)rq->buffer);
667 * sd_init_command - build a scsi (read or write) command from
668 * information in the request structure.
669 * @SCpnt: pointer to mid-level's per scsi command structure that
670 * contains request and into which the scsi command is written
672 * Returns 1 if successful and 0 if error (or cannot be done now).
674 static int sd_prep_fn(struct request_queue *q, struct request *rq)
676 struct scsi_cmnd *SCpnt;
677 struct scsi_device *sdp = q->queuedata;
678 struct gendisk *disk = rq->rq_disk;
679 struct scsi_disk *sdkp;
680 sector_t block = blk_rq_pos(rq);
682 unsigned int this_count = blk_rq_sectors(rq);
684 unsigned char protect;
687 * Discard request come in as REQ_TYPE_FS but we turn them into
688 * block PC requests to make life easier.
690 if (rq->cmd_flags & REQ_DISCARD) {
691 ret = scsi_setup_discard_cmnd(sdp, rq);
693 } else if (rq->cmd_flags & REQ_FLUSH) {
694 ret = scsi_setup_flush_cmnd(sdp, rq);
696 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
697 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
699 } else if (rq->cmd_type != REQ_TYPE_FS) {
703 ret = scsi_setup_fs_cmnd(sdp, rq);
704 if (ret != BLKPREP_OK)
707 sdkp = scsi_disk(disk);
709 /* from here on until we're complete, any goto out
710 * is used for a killable error condition */
713 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
714 "sd_init_command: block=%llu, "
716 (unsigned long long)block,
719 if (!sdp || !scsi_device_online(sdp) ||
720 block + blk_rq_sectors(rq) > get_capacity(disk)) {
721 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
722 "Finishing %u sectors\n",
723 blk_rq_sectors(rq)));
724 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
725 "Retry with 0x%p\n", SCpnt));
731 * quietly refuse to do anything to a changed disc until
732 * the changed bit has been reset
734 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
739 * Some SD card readers can't handle multi-sector accesses which touch
740 * the last one or two hardware sectors. Split accesses as needed.
742 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
743 (sdp->sector_size / 512);
745 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
746 if (block < threshold) {
747 /* Access up to the threshold but not beyond */
748 this_count = threshold - block;
750 /* Access only a single hardware sector */
751 this_count = sdp->sector_size / 512;
755 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
756 (unsigned long long)block));
759 * If we have a 1K hardware sectorsize, prevent access to single
760 * 512 byte sectors. In theory we could handle this - in fact
761 * the scsi cdrom driver must be able to handle this because
762 * we typically use 1K blocksizes, and cdroms typically have
763 * 2K hardware sectorsizes. Of course, things are simpler
764 * with the cdrom, since it is read-only. For performance
765 * reasons, the filesystems should be able to handle this
766 * and not force the scsi disk driver to use bounce buffers
769 if (sdp->sector_size == 1024) {
770 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
771 scmd_printk(KERN_ERR, SCpnt,
772 "Bad block number requested\n");
776 this_count = this_count >> 1;
779 if (sdp->sector_size == 2048) {
780 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
781 scmd_printk(KERN_ERR, SCpnt,
782 "Bad block number requested\n");
786 this_count = this_count >> 2;
789 if (sdp->sector_size == 4096) {
790 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
791 scmd_printk(KERN_ERR, SCpnt,
792 "Bad block number requested\n");
796 this_count = this_count >> 3;
799 if (rq_data_dir(rq) == WRITE) {
800 if (!sdp->writeable) {
803 SCpnt->cmnd[0] = WRITE_6;
804 SCpnt->sc_data_direction = DMA_TO_DEVICE;
806 if (blk_integrity_rq(rq) &&
807 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
810 } else if (rq_data_dir(rq) == READ) {
811 SCpnt->cmnd[0] = READ_6;
812 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
814 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
818 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
819 "%s %d/%u 512 byte blocks.\n",
820 (rq_data_dir(rq) == WRITE) ?
821 "writing" : "reading", this_count,
822 blk_rq_sectors(rq)));
824 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
825 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
831 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
832 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
834 if (unlikely(SCpnt->cmnd == NULL)) {
839 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
840 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
841 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
842 SCpnt->cmnd[7] = 0x18;
843 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
844 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
847 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
848 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
849 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
850 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
851 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
852 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
853 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
854 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
856 /* Expected Indirect LBA */
857 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
858 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
859 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
860 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
862 /* Transfer length */
863 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
864 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
865 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
866 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
867 } else if (block > 0xffffffff) {
868 SCpnt->cmnd[0] += READ_16 - READ_6;
869 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
870 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
871 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
872 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
873 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
874 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
875 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
876 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
877 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
878 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
879 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
880 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
881 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
882 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
883 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
884 scsi_device_protection(SCpnt->device) ||
885 SCpnt->device->use_10_for_rw) {
886 if (this_count > 0xffff)
889 SCpnt->cmnd[0] += READ_10 - READ_6;
890 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
891 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
892 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
893 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
894 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
895 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
896 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
897 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
899 if (unlikely(rq->cmd_flags & REQ_FUA)) {
901 * This happens only if this drive failed
902 * 10byte rw command with ILLEGAL_REQUEST
903 * during operation and thus turned off
906 scmd_printk(KERN_ERR, SCpnt,
907 "FUA write on READ/WRITE(6) drive\n");
911 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
912 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
913 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
914 SCpnt->cmnd[4] = (unsigned char) this_count;
917 SCpnt->sdb.length = this_count * sdp->sector_size;
919 /* If DIF or DIX is enabled, tell HBA how to handle request */
920 if (host_dif || scsi_prot_sg_count(SCpnt))
921 sd_prot_op(SCpnt, host_dif);
924 * We shouldn't disconnect in the middle of a sector, so with a dumb
925 * host adapter, it's safe to assume that we can at least transfer
926 * this many bytes between each connect / disconnect.
928 SCpnt->transfersize = sdp->sector_size;
929 SCpnt->underflow = this_count << 9;
930 SCpnt->allowed = SD_MAX_RETRIES;
933 * This indicates that the command is ready from our end to be
938 return scsi_prep_return(q, rq, ret);
942 * sd_open - open a scsi disk device
943 * @inode: only i_rdev member may be used
944 * @filp: only f_mode and f_flags may be used
946 * Returns 0 if successful. Returns a negated errno value in case
949 * Note: This can be called from a user context (e.g. fsck(1) )
950 * or from within the kernel (e.g. as a result of a mount(1) ).
951 * In the latter case @inode and @filp carry an abridged amount
952 * of information as noted above.
954 * Locking: called with bdev->bd_mutex held.
956 static int sd_open(struct block_device *bdev, fmode_t mode)
958 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
959 struct scsi_device *sdev;
965 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
969 retval = scsi_autopm_get_device(sdev);
974 * If the device is in error recovery, wait until it is done.
975 * If the device is offline, then disallow any access to it.
978 if (!scsi_block_when_processing_errors(sdev))
981 if (sdev->removable || sdkp->write_prot)
982 check_disk_change(bdev);
985 * If the drive is empty, just let the open fail.
988 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
992 * If the device has the write protect tab set, have the open fail
993 * if the user expects to be able to write to the thing.
996 if (sdkp->write_prot && (mode & FMODE_WRITE))
1000 * It is possible that the disk changing stuff resulted in
1001 * the device being taken offline. If this is the case,
1002 * report this to the user, and don't pretend that the
1003 * open actually succeeded.
1006 if (!scsi_device_online(sdev))
1009 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1010 if (scsi_block_when_processing_errors(sdev))
1011 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1017 scsi_autopm_put_device(sdev);
1019 scsi_disk_put(sdkp);
1024 * sd_release - invoked when the (last) close(2) is called on this
1026 * @inode: only i_rdev member may be used
1027 * @filp: only f_mode and f_flags may be used
1031 * Note: may block (uninterruptible) if error recovery is underway
1034 * Locking: called with bdev->bd_mutex held.
1036 static int sd_release(struct gendisk *disk, fmode_t mode)
1038 struct scsi_disk *sdkp = scsi_disk(disk);
1039 struct scsi_device *sdev = sdkp->device;
1041 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1043 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1044 if (scsi_block_when_processing_errors(sdev))
1045 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1049 * XXX and what if there are packets in flight and this close()
1050 * XXX is followed by a "rmmod sd_mod"?
1053 scsi_autopm_put_device(sdev);
1054 scsi_disk_put(sdkp);
1058 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1060 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1061 struct scsi_device *sdp = sdkp->device;
1062 struct Scsi_Host *host = sdp->host;
1065 /* default to most commonly used values */
1066 diskinfo[0] = 0x40; /* 1 << 6 */
1067 diskinfo[1] = 0x20; /* 1 << 5 */
1068 diskinfo[2] = sdkp->capacity >> 11;
1070 /* override with calculated, extended default, or driver values */
1071 if (host->hostt->bios_param)
1072 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1074 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1076 geo->heads = diskinfo[0];
1077 geo->sectors = diskinfo[1];
1078 geo->cylinders = diskinfo[2];
1083 * sd_ioctl - process an ioctl
1084 * @inode: only i_rdev/i_bdev members may be used
1085 * @filp: only f_mode and f_flags may be used
1086 * @cmd: ioctl command number
1087 * @arg: this is third argument given to ioctl(2) system call.
1088 * Often contains a pointer.
1090 * Returns 0 if successful (some ioctls return positive numbers on
1091 * success as well). Returns a negated errno value in case of error.
1093 * Note: most ioctls are forward onto the block subsystem or further
1094 * down in the scsi subsystem.
1096 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1097 unsigned int cmd, unsigned long arg)
1099 struct gendisk *disk = bdev->bd_disk;
1100 struct scsi_disk *sdkp = scsi_disk(disk);
1101 struct scsi_device *sdp = sdkp->device;
1102 void __user *p = (void __user *)arg;
1105 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1106 "cmd=0x%x\n", disk->disk_name, cmd));
1108 error = scsi_verify_blk_ioctl(bdev, cmd);
1113 * If we are in the middle of error recovery, don't let anyone
1114 * else try and use this device. Also, if error recovery fails, it
1115 * may try and take the device offline, in which case all further
1116 * access to the device is prohibited.
1118 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1119 (mode & FMODE_NDELAY) != 0);
1120 if (!scsi_block_when_processing_errors(sdp) || !error)
1124 * Send SCSI addressing ioctls directly to mid level, send other
1125 * ioctls to block level and then onto mid level if they can't be
1129 case SCSI_IOCTL_GET_IDLUN:
1130 case SCSI_IOCTL_GET_BUS_NUMBER:
1131 error = scsi_ioctl(sdp, cmd, p);
1134 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1135 if (error != -ENOTTY)
1137 error = scsi_ioctl(sdp, cmd, p);
1144 static void set_media_not_present(struct scsi_disk *sdkp)
1146 if (sdkp->media_present)
1147 sdkp->device->changed = 1;
1149 if (sdkp->device->removable) {
1150 sdkp->media_present = 0;
1155 static int media_not_present(struct scsi_disk *sdkp,
1156 struct scsi_sense_hdr *sshdr)
1158 if (!scsi_sense_valid(sshdr))
1161 /* not invoked for commands that could return deferred errors */
1162 switch (sshdr->sense_key) {
1163 case UNIT_ATTENTION:
1165 /* medium not present */
1166 if (sshdr->asc == 0x3A) {
1167 set_media_not_present(sdkp);
1175 * sd_check_events - check media events
1176 * @disk: kernel device descriptor
1177 * @clearing: disk events currently being cleared
1179 * Returns mask of DISK_EVENT_*.
1181 * Note: this function is invoked from the block subsystem.
1183 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1185 struct scsi_disk *sdkp = scsi_disk(disk);
1186 struct scsi_device *sdp = sdkp->device;
1187 struct scsi_sense_hdr *sshdr = NULL;
1190 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1193 * If the device is offline, don't send any commands - just pretend as
1194 * if the command failed. If the device ever comes back online, we
1195 * can deal with it then. It is only because of unrecoverable errors
1196 * that we would ever take a device offline in the first place.
1198 if (!scsi_device_online(sdp)) {
1199 set_media_not_present(sdkp);
1204 * Using TEST_UNIT_READY enables differentiation between drive with
1205 * no cartridge loaded - NOT READY, drive with changed cartridge -
1206 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1208 * Drives that auto spin down. eg iomega jaz 1G, will be started
1209 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1210 * sd_revalidate() is called.
1214 if (scsi_block_when_processing_errors(sdp)) {
1215 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1216 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1220 /* failed to execute TUR, assume media not present */
1221 if (host_byte(retval)) {
1222 set_media_not_present(sdkp);
1226 if (media_not_present(sdkp, sshdr))
1230 * For removable scsi disk we have to recognise the presence
1231 * of a disk in the drive.
1233 if (!sdkp->media_present)
1235 sdkp->media_present = 1;
1238 * sdp->changed is set under the following conditions:
1240 * Medium present state has changed in either direction.
1241 * Device has indicated UNIT_ATTENTION.
1244 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1249 static int sd_sync_cache(struct scsi_disk *sdkp)
1252 struct scsi_device *sdp = sdkp->device;
1253 struct scsi_sense_hdr sshdr;
1255 if (!scsi_device_online(sdp))
1259 for (retries = 3; retries > 0; --retries) {
1260 unsigned char cmd[10] = { 0 };
1262 cmd[0] = SYNCHRONIZE_CACHE;
1264 * Leave the rest of the command zero to indicate
1267 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1268 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1274 sd_print_result(sdkp, res);
1275 if (driver_byte(res) & DRIVER_SENSE)
1276 sd_print_sense_hdr(sdkp, &sshdr);
1284 static void sd_rescan(struct device *dev)
1286 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1289 revalidate_disk(sdkp->disk);
1290 scsi_disk_put(sdkp);
1295 #ifdef CONFIG_COMPAT
1297 * This gets directly called from VFS. When the ioctl
1298 * is not recognized we go back to the other translation paths.
1300 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1301 unsigned int cmd, unsigned long arg)
1303 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1306 ret = scsi_verify_blk_ioctl(bdev, cmd);
1311 * If we are in the middle of error recovery, don't let anyone
1312 * else try and use this device. Also, if error recovery fails, it
1313 * may try and take the device offline, in which case all further
1314 * access to the device is prohibited.
1316 if (!scsi_block_when_processing_errors(sdev))
1319 if (sdev->host->hostt->compat_ioctl) {
1320 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1326 * Let the static ioctl translation table take care of it.
1328 return -ENOIOCTLCMD;
1332 static const struct block_device_operations sd_fops = {
1333 .owner = THIS_MODULE,
1335 .release = sd_release,
1337 .getgeo = sd_getgeo,
1338 #ifdef CONFIG_COMPAT
1339 .compat_ioctl = sd_compat_ioctl,
1341 .check_events = sd_check_events,
1342 .revalidate_disk = sd_revalidate_disk,
1343 .unlock_native_capacity = sd_unlock_native_capacity,
1347 * sd_eh_action - error handling callback
1348 * @scmd: sd-issued command that has failed
1349 * @eh_cmnd: The command that was sent during error handling
1350 * @eh_cmnd_len: Length of eh_cmnd in bytes
1351 * @eh_disp: The recovery disposition suggested by the midlayer
1353 * This function is called by the SCSI midlayer upon completion of
1354 * an error handling command (TEST UNIT READY, START STOP UNIT,
1355 * etc.) The command sent to the device by the error handler is
1356 * stored in eh_cmnd. The result of sending the eh command is
1357 * passed in eh_disp.
1359 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1360 int eh_cmnd_len, int eh_disp)
1362 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1364 if (!scsi_device_online(scmd->device) ||
1365 !scsi_medium_access_command(scmd))
1369 * The device has timed out executing a medium access command.
1370 * However, the TEST UNIT READY command sent during error
1371 * handling completed successfully. Either the device is in the
1372 * process of recovering or has it suffered an internal failure
1373 * that prevents access to the storage medium.
1375 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1376 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1377 sdkp->medium_access_timed_out++;
1380 * If the device keeps failing read/write commands but TEST UNIT
1381 * READY always completes successfully we assume that medium
1382 * access is no longer possible and take the device offline.
1384 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1385 scmd_printk(KERN_ERR, scmd,
1386 "Medium access timeout failure. Offlining disk!\n");
1387 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1395 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1397 u64 start_lba = blk_rq_pos(scmd->request);
1398 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1402 * resid is optional but mostly filled in. When it's unused,
1403 * its value is zero, so we assume the whole buffer transferred
1405 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1406 unsigned int good_bytes;
1408 if (scmd->request->cmd_type != REQ_TYPE_FS)
1411 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1412 SCSI_SENSE_BUFFERSIZE,
1417 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1420 if (scmd->device->sector_size < 512) {
1421 /* only legitimate sector_size here is 256 */
1425 /* be careful ... don't want any overflows */
1426 u64 factor = scmd->device->sector_size / 512;
1427 do_div(start_lba, factor);
1428 do_div(end_lba, factor);
1431 /* The bad lba was reported incorrectly, we have no idea where
1434 if (bad_lba < start_lba || bad_lba >= end_lba)
1437 /* This computation should always be done in terms of
1438 * the resolution of the device's medium.
1440 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1441 return min(good_bytes, transferred);
1445 * sd_done - bottom half handler: called when the lower level
1446 * driver has completed (successfully or otherwise) a scsi command.
1447 * @SCpnt: mid-level's per command structure.
1449 * Note: potentially run from within an ISR. Must not block.
1451 static int sd_done(struct scsi_cmnd *SCpnt)
1453 int result = SCpnt->result;
1454 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1455 struct scsi_sense_hdr sshdr;
1456 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1457 int sense_valid = 0;
1458 int sense_deferred = 0;
1459 unsigned char op = SCpnt->cmnd[0];
1461 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1462 scsi_set_resid(SCpnt, 0);
1465 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1467 sense_deferred = scsi_sense_is_deferred(&sshdr);
1469 #ifdef CONFIG_SCSI_LOGGING
1470 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1472 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1473 "sd_done: sb[respc,sk,asc,"
1474 "ascq]=%x,%x,%x,%x\n",
1475 sshdr.response_code,
1476 sshdr.sense_key, sshdr.asc,
1480 if (driver_byte(result) != DRIVER_SENSE &&
1481 (!sense_valid || sense_deferred))
1484 sdkp->medium_access_timed_out = 0;
1486 switch (sshdr.sense_key) {
1487 case HARDWARE_ERROR:
1489 good_bytes = sd_completed_bytes(SCpnt);
1491 case RECOVERED_ERROR:
1492 good_bytes = scsi_bufflen(SCpnt);
1495 /* This indicates a false check condition, so ignore it. An
1496 * unknown amount of data was transferred so treat it as an
1499 scsi_print_sense("sd", SCpnt);
1501 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1503 case ABORTED_COMMAND:
1504 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1505 good_bytes = sd_completed_bytes(SCpnt);
1507 case ILLEGAL_REQUEST:
1508 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1509 good_bytes = sd_completed_bytes(SCpnt);
1510 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1511 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1512 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1513 sd_config_discard(sdkp, SD_LBP_DISABLE);
1519 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1520 sd_dif_complete(SCpnt, good_bytes);
1522 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1523 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1525 /* We have to print a failed command here as the
1526 * extended CDB gets freed before scsi_io_completion()
1530 scsi_print_command(SCpnt);
1532 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1541 * spinup disk - called only in sd_revalidate_disk()
1544 sd_spinup_disk(struct scsi_disk *sdkp)
1546 unsigned char cmd[10];
1547 unsigned long spintime_expire = 0;
1548 int retries, spintime;
1549 unsigned int the_result;
1550 struct scsi_sense_hdr sshdr;
1551 int sense_valid = 0;
1555 /* Spin up drives, as required. Only do this at boot time */
1556 /* Spinup needs to be done for module loads too. */
1561 cmd[0] = TEST_UNIT_READY;
1562 memset((void *) &cmd[1], 0, 9);
1564 the_result = scsi_execute_req(sdkp->device, cmd,
1567 SD_MAX_RETRIES, NULL);
1570 * If the drive has indicated to us that it
1571 * doesn't have any media in it, don't bother
1572 * with any more polling.
1574 if (media_not_present(sdkp, &sshdr))
1578 sense_valid = scsi_sense_valid(&sshdr);
1580 } while (retries < 3 &&
1581 (!scsi_status_is_good(the_result) ||
1582 ((driver_byte(the_result) & DRIVER_SENSE) &&
1583 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1585 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1586 /* no sense, TUR either succeeded or failed
1587 * with a status error */
1588 if(!spintime && !scsi_status_is_good(the_result)) {
1589 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1590 sd_print_result(sdkp, the_result);
1596 * The device does not want the automatic start to be issued.
1598 if (sdkp->device->no_start_on_add)
1601 if (sense_valid && sshdr.sense_key == NOT_READY) {
1602 if (sshdr.asc == 4 && sshdr.ascq == 3)
1603 break; /* manual intervention required */
1604 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1605 break; /* standby */
1606 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1607 break; /* unavailable */
1609 * Issue command to spin up drive when not ready
1612 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1613 cmd[0] = START_STOP;
1614 cmd[1] = 1; /* Return immediately */
1615 memset((void *) &cmd[2], 0, 8);
1616 cmd[4] = 1; /* Start spin cycle */
1617 if (sdkp->device->start_stop_pwr_cond)
1619 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1621 SD_TIMEOUT, SD_MAX_RETRIES,
1623 spintime_expire = jiffies + 100 * HZ;
1626 /* Wait 1 second for next try */
1631 * Wait for USB flash devices with slow firmware.
1632 * Yes, this sense key/ASC combination shouldn't
1633 * occur here. It's characteristic of these devices.
1635 } else if (sense_valid &&
1636 sshdr.sense_key == UNIT_ATTENTION &&
1637 sshdr.asc == 0x28) {
1639 spintime_expire = jiffies + 5 * HZ;
1642 /* Wait 1 second for next try */
1645 /* we don't understand the sense code, so it's
1646 * probably pointless to loop */
1648 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1649 sd_print_sense_hdr(sdkp, &sshdr);
1654 } while (spintime && time_before_eq(jiffies, spintime_expire));
1657 if (scsi_status_is_good(the_result))
1660 printk("not responding...\n");
1666 * Determine whether disk supports Data Integrity Field.
1668 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1670 struct scsi_device *sdp = sdkp->device;
1673 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1676 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1678 if (type == sdkp->protection_type || !sdkp->first_scan)
1681 sdkp->protection_type = type;
1683 if (type > SD_DIF_TYPE3_PROTECTION) {
1684 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1685 "protection type %u. Disabling disk!\n", type);
1690 if (scsi_host_dif_capable(sdp->host, type))
1691 sd_printk(KERN_NOTICE, sdkp,
1692 "Enabling DIF Type %u protection\n", type);
1694 sd_printk(KERN_NOTICE, sdkp,
1695 "Disabling DIF Type %u protection\n", type);
1698 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1699 struct scsi_sense_hdr *sshdr, int sense_valid,
1702 sd_print_result(sdkp, the_result);
1703 if (driver_byte(the_result) & DRIVER_SENSE)
1704 sd_print_sense_hdr(sdkp, sshdr);
1706 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1709 * Set dirty bit for removable devices if not ready -
1710 * sometimes drives will not report this properly.
1712 if (sdp->removable &&
1713 sense_valid && sshdr->sense_key == NOT_READY)
1714 set_media_not_present(sdkp);
1717 * We used to set media_present to 0 here to indicate no media
1718 * in the drive, but some drives fail read capacity even with
1719 * media present, so we can't do that.
1721 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1725 #if RC16_LEN > SD_BUF_SIZE
1726 #error RC16_LEN must not be more than SD_BUF_SIZE
1729 #define READ_CAPACITY_RETRIES_ON_RESET 10
1731 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1732 unsigned char *buffer)
1734 unsigned char cmd[16];
1735 struct scsi_sense_hdr sshdr;
1736 int sense_valid = 0;
1738 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1739 unsigned int alignment;
1740 unsigned long long lba;
1741 unsigned sector_size;
1743 if (sdp->no_read_capacity_16)
1748 cmd[0] = SERVICE_ACTION_IN;
1749 cmd[1] = SAI_READ_CAPACITY_16;
1751 memset(buffer, 0, RC16_LEN);
1753 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1754 buffer, RC16_LEN, &sshdr,
1755 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1757 if (media_not_present(sdkp, &sshdr))
1761 sense_valid = scsi_sense_valid(&sshdr);
1763 sshdr.sense_key == ILLEGAL_REQUEST &&
1764 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1766 /* Invalid Command Operation Code or
1767 * Invalid Field in CDB, just retry
1768 * silently with RC10 */
1771 sshdr.sense_key == UNIT_ATTENTION &&
1772 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1773 /* Device reset might occur several times,
1774 * give it one more chance */
1775 if (--reset_retries > 0)
1780 } while (the_result && retries);
1783 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1784 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1788 sector_size = get_unaligned_be32(&buffer[8]);
1789 lba = get_unaligned_be64(&buffer[0]);
1791 sd_read_protection_type(sdkp, buffer);
1793 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1794 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1795 "kernel compiled with support for large block "
1801 /* Logical blocks per physical block exponent */
1802 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1804 /* Lowest aligned logical block */
1805 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1806 blk_queue_alignment_offset(sdp->request_queue, alignment);
1807 if (alignment && sdkp->first_scan)
1808 sd_printk(KERN_NOTICE, sdkp,
1809 "physical block alignment offset: %u\n", alignment);
1811 if (buffer[14] & 0x80) { /* LBPME */
1814 if (buffer[14] & 0x40) /* LBPRZ */
1817 sd_config_discard(sdkp, SD_LBP_WS16);
1820 sdkp->capacity = lba + 1;
1824 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1825 unsigned char *buffer)
1827 unsigned char cmd[16];
1828 struct scsi_sense_hdr sshdr;
1829 int sense_valid = 0;
1831 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1833 unsigned sector_size;
1836 cmd[0] = READ_CAPACITY;
1837 memset(&cmd[1], 0, 9);
1838 memset(buffer, 0, 8);
1840 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1842 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1844 if (media_not_present(sdkp, &sshdr))
1848 sense_valid = scsi_sense_valid(&sshdr);
1850 sshdr.sense_key == UNIT_ATTENTION &&
1851 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1852 /* Device reset might occur several times,
1853 * give it one more chance */
1854 if (--reset_retries > 0)
1859 } while (the_result && retries);
1862 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1863 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1867 sector_size = get_unaligned_be32(&buffer[4]);
1868 lba = get_unaligned_be32(&buffer[0]);
1870 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1871 /* Some buggy (usb cardreader) devices return an lba of
1872 0xffffffff when the want to report a size of 0 (with
1873 which they really mean no media is present) */
1875 sdkp->physical_block_size = sector_size;
1879 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1880 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1881 "kernel compiled with support for large block "
1887 sdkp->capacity = lba + 1;
1888 sdkp->physical_block_size = sector_size;
1892 static int sd_try_rc16_first(struct scsi_device *sdp)
1894 if (sdp->host->max_cmd_len < 16)
1896 if (sdp->scsi_level > SCSI_SPC_2)
1898 if (scsi_device_protection(sdp))
1904 * read disk capacity
1907 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1910 struct scsi_device *sdp = sdkp->device;
1911 sector_t old_capacity = sdkp->capacity;
1913 if (sd_try_rc16_first(sdp)) {
1914 sector_size = read_capacity_16(sdkp, sdp, buffer);
1915 if (sector_size == -EOVERFLOW)
1917 if (sector_size == -ENODEV)
1919 if (sector_size < 0)
1920 sector_size = read_capacity_10(sdkp, sdp, buffer);
1921 if (sector_size < 0)
1924 sector_size = read_capacity_10(sdkp, sdp, buffer);
1925 if (sector_size == -EOVERFLOW)
1927 if (sector_size < 0)
1929 if ((sizeof(sdkp->capacity) > 4) &&
1930 (sdkp->capacity > 0xffffffffULL)) {
1931 int old_sector_size = sector_size;
1932 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1933 "Trying to use READ CAPACITY(16).\n");
1934 sector_size = read_capacity_16(sdkp, sdp, buffer);
1935 if (sector_size < 0) {
1936 sd_printk(KERN_NOTICE, sdkp,
1937 "Using 0xffffffff as device size\n");
1938 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1939 sector_size = old_sector_size;
1945 /* Some devices are known to return the total number of blocks,
1946 * not the highest block number. Some devices have versions
1947 * which do this and others which do not. Some devices we might
1948 * suspect of doing this but we don't know for certain.
1950 * If we know the reported capacity is wrong, decrement it. If
1951 * we can only guess, then assume the number of blocks is even
1952 * (usually true but not always) and err on the side of lowering
1955 if (sdp->fix_capacity ||
1956 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1957 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1958 "from its reported value: %llu\n",
1959 (unsigned long long) sdkp->capacity);
1964 if (sector_size == 0) {
1966 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1970 if (sector_size != 512 &&
1971 sector_size != 1024 &&
1972 sector_size != 2048 &&
1973 sector_size != 4096 &&
1974 sector_size != 256) {
1975 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1978 * The user might want to re-format the drive with
1979 * a supported sectorsize. Once this happens, it
1980 * would be relatively trivial to set the thing up.
1981 * For this reason, we leave the thing in the table.
1985 * set a bogus sector size so the normal read/write
1986 * logic in the block layer will eventually refuse any
1987 * request on this device without tripping over power
1988 * of two sector size assumptions
1992 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1995 char cap_str_2[10], cap_str_10[10];
1996 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1998 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2000 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2001 sizeof(cap_str_10));
2003 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2004 sd_printk(KERN_NOTICE, sdkp,
2005 "%llu %d-byte logical blocks: (%s/%s)\n",
2006 (unsigned long long)sdkp->capacity,
2007 sector_size, cap_str_10, cap_str_2);
2009 if (sdkp->physical_block_size != sector_size)
2010 sd_printk(KERN_NOTICE, sdkp,
2011 "%u-byte physical blocks\n",
2012 sdkp->physical_block_size);
2016 /* Rescale capacity to 512-byte units */
2017 if (sector_size == 4096)
2018 sdkp->capacity <<= 3;
2019 else if (sector_size == 2048)
2020 sdkp->capacity <<= 2;
2021 else if (sector_size == 1024)
2022 sdkp->capacity <<= 1;
2023 else if (sector_size == 256)
2024 sdkp->capacity >>= 1;
2026 blk_queue_physical_block_size(sdp->request_queue,
2027 sdkp->physical_block_size);
2028 sdkp->device->sector_size = sector_size;
2031 /* called with buffer of length 512 */
2033 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2034 unsigned char *buffer, int len, struct scsi_mode_data *data,
2035 struct scsi_sense_hdr *sshdr)
2037 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2038 SD_TIMEOUT, SD_MAX_RETRIES, data,
2043 * read write protect setting, if possible - called only in sd_revalidate_disk()
2044 * called with buffer of length SD_BUF_SIZE
2047 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2050 struct scsi_device *sdp = sdkp->device;
2051 struct scsi_mode_data data;
2052 int old_wp = sdkp->write_prot;
2054 set_disk_ro(sdkp->disk, 0);
2055 if (sdp->skip_ms_page_3f) {
2056 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2060 if (sdp->use_192_bytes_for_3f) {
2061 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2064 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2065 * We have to start carefully: some devices hang if we ask
2066 * for more than is available.
2068 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2071 * Second attempt: ask for page 0 When only page 0 is
2072 * implemented, a request for page 3F may return Sense Key
2073 * 5: Illegal Request, Sense Code 24: Invalid field in
2076 if (!scsi_status_is_good(res))
2077 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2080 * Third attempt: ask 255 bytes, as we did earlier.
2082 if (!scsi_status_is_good(res))
2083 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2087 if (!scsi_status_is_good(res)) {
2088 sd_printk(KERN_WARNING, sdkp,
2089 "Test WP failed, assume Write Enabled\n");
2091 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2092 set_disk_ro(sdkp->disk, sdkp->write_prot);
2093 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2094 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2095 sdkp->write_prot ? "on" : "off");
2096 sd_printk(KERN_DEBUG, sdkp,
2097 "Mode Sense: %02x %02x %02x %02x\n",
2098 buffer[0], buffer[1], buffer[2], buffer[3]);
2104 * sd_read_cache_type - called only from sd_revalidate_disk()
2105 * called with buffer of length SD_BUF_SIZE
2108 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2111 struct scsi_device *sdp = sdkp->device;
2116 struct scsi_mode_data data;
2117 struct scsi_sense_hdr sshdr;
2118 int old_wce = sdkp->WCE;
2119 int old_rcd = sdkp->RCD;
2120 int old_dpofua = sdkp->DPOFUA;
2123 if (sdp->skip_ms_page_8) {
2124 if (sdp->type == TYPE_RBC)
2127 if (sdp->skip_ms_page_3f)
2130 if (sdp->use_192_bytes_for_3f)
2134 } else if (sdp->type == TYPE_RBC) {
2142 /* cautiously ask */
2143 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2146 if (!scsi_status_is_good(res))
2149 if (!data.header_length) {
2152 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2155 /* that went OK, now ask for the proper length */
2159 * We're only interested in the first three bytes, actually.
2160 * But the data cache page is defined for the first 20.
2164 else if (len > SD_BUF_SIZE) {
2165 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2166 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2169 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2173 if (len > first_len)
2174 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2177 if (scsi_status_is_good(res)) {
2178 int offset = data.header_length + data.block_descriptor_length;
2180 while (offset < len) {
2181 u8 page_code = buffer[offset] & 0x3F;
2182 u8 spf = buffer[offset] & 0x40;
2184 if (page_code == 8 || page_code == 6) {
2185 /* We're interested only in the first 3 bytes.
2187 if (len - offset <= 2) {
2188 sd_printk(KERN_ERR, sdkp, "Incomplete "
2189 "mode parameter data\n");
2192 modepage = page_code;
2196 /* Go to the next page */
2197 if (spf && len - offset > 3)
2198 offset += 4 + (buffer[offset+2] << 8) +
2200 else if (!spf && len - offset > 1)
2201 offset += 2 + buffer[offset+1];
2203 sd_printk(KERN_ERR, sdkp, "Incomplete "
2204 "mode parameter data\n");
2210 if (modepage == 0x3F) {
2211 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2214 } else if ((buffer[offset] & 0x3f) != modepage) {
2215 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2219 if (modepage == 8) {
2220 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2221 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2223 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2227 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2228 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2229 sd_printk(KERN_NOTICE, sdkp,
2230 "Uses READ/WRITE(6), disabling FUA\n");
2234 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2235 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2236 sd_printk(KERN_NOTICE, sdkp,
2237 "Write cache: %s, read cache: %s, %s\n",
2238 sdkp->WCE ? "enabled" : "disabled",
2239 sdkp->RCD ? "disabled" : "enabled",
2240 sdkp->DPOFUA ? "supports DPO and FUA"
2241 : "doesn't support DPO or FUA");
2247 if (scsi_sense_valid(&sshdr) &&
2248 sshdr.sense_key == ILLEGAL_REQUEST &&
2249 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2250 /* Invalid field in CDB */
2251 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2253 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2256 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2263 * The ATO bit indicates whether the DIF application tag is available
2264 * for use by the operating system.
2266 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2269 struct scsi_device *sdp = sdkp->device;
2270 struct scsi_mode_data data;
2271 struct scsi_sense_hdr sshdr;
2273 if (sdp->type != TYPE_DISK)
2276 if (sdkp->protection_type == 0)
2279 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2280 SD_MAX_RETRIES, &data, &sshdr);
2282 if (!scsi_status_is_good(res) || !data.header_length ||
2284 sd_printk(KERN_WARNING, sdkp,
2285 "getting Control mode page failed, assume no ATO\n");
2287 if (scsi_sense_valid(&sshdr))
2288 sd_print_sense_hdr(sdkp, &sshdr);
2293 offset = data.header_length + data.block_descriptor_length;
2295 if ((buffer[offset] & 0x3f) != 0x0a) {
2296 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2300 if ((buffer[offset + 5] & 0x80) == 0)
2309 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2310 * @disk: disk to query
2312 static void sd_read_block_limits(struct scsi_disk *sdkp)
2314 unsigned int sector_sz = sdkp->device->sector_size;
2315 const int vpd_len = 64;
2316 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2319 /* Block Limits VPD */
2320 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2323 blk_queue_io_min(sdkp->disk->queue,
2324 get_unaligned_be16(&buffer[6]) * sector_sz);
2325 blk_queue_io_opt(sdkp->disk->queue,
2326 get_unaligned_be32(&buffer[12]) * sector_sz);
2328 if (buffer[3] == 0x3c) {
2329 unsigned int lba_count, desc_count;
2331 sdkp->max_ws_blocks =
2332 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2338 lba_count = get_unaligned_be32(&buffer[20]);
2339 desc_count = get_unaligned_be32(&buffer[24]);
2341 if (lba_count && desc_count)
2342 sdkp->max_unmap_blocks = lba_count;
2344 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2346 if (buffer[32] & 0x80)
2347 sdkp->unmap_alignment =
2348 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2350 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2352 if (sdkp->max_unmap_blocks)
2353 sd_config_discard(sdkp, SD_LBP_UNMAP);
2355 sd_config_discard(sdkp, SD_LBP_WS16);
2357 } else { /* LBP VPD page tells us what to use */
2359 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2360 sd_config_discard(sdkp, SD_LBP_UNMAP);
2361 else if (sdkp->lbpws)
2362 sd_config_discard(sdkp, SD_LBP_WS16);
2363 else if (sdkp->lbpws10)
2364 sd_config_discard(sdkp, SD_LBP_WS10);
2366 sd_config_discard(sdkp, SD_LBP_DISABLE);
2375 * sd_read_block_characteristics - Query block dev. characteristics
2376 * @disk: disk to query
2378 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2380 unsigned char *buffer;
2382 const int vpd_len = 64;
2384 buffer = kmalloc(vpd_len, GFP_KERNEL);
2387 /* Block Device Characteristics VPD */
2388 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2391 rot = get_unaligned_be16(&buffer[4]);
2394 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2401 * sd_read_block_provisioning - Query provisioning VPD page
2402 * @disk: disk to query
2404 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2406 unsigned char *buffer;
2407 const int vpd_len = 8;
2409 if (sdkp->lbpme == 0)
2412 buffer = kmalloc(vpd_len, GFP_KERNEL);
2414 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2418 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2419 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2420 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2426 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2429 * Although VPD inquiries can go to SCSI-2 type devices,
2430 * some USB ones crash on receiving them, and the pages
2431 * we currently ask for are for SPC-3 and beyond
2433 if (sdp->scsi_level > SCSI_SPC_2)
2439 * sd_revalidate_disk - called the first time a new disk is seen,
2440 * performs disk spin up, read_capacity, etc.
2441 * @disk: struct gendisk we care about
2443 static int sd_revalidate_disk(struct gendisk *disk)
2445 struct scsi_disk *sdkp = scsi_disk(disk);
2446 struct scsi_device *sdp = sdkp->device;
2447 unsigned char *buffer;
2450 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2451 "sd_revalidate_disk\n"));
2454 * If the device is offline, don't try and read capacity or any
2455 * of the other niceties.
2457 if (!scsi_device_online(sdp))
2460 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2462 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2463 "allocation failure.\n");
2467 sd_spinup_disk(sdkp);
2470 * Without media there is no reason to ask; moreover, some devices
2471 * react badly if we do.
2473 if (sdkp->media_present) {
2474 sd_read_capacity(sdkp, buffer);
2476 if (sd_try_extended_inquiry(sdp)) {
2477 sd_read_block_provisioning(sdkp);
2478 sd_read_block_limits(sdkp);
2479 sd_read_block_characteristics(sdkp);
2482 sd_read_write_protect_flag(sdkp, buffer);
2483 sd_read_cache_type(sdkp, buffer);
2484 sd_read_app_tag_own(sdkp, buffer);
2487 sdkp->first_scan = 0;
2490 * We now have all cache related info, determine how we deal
2491 * with flush requests.
2499 blk_queue_flush(sdkp->disk->queue, flush);
2501 set_capacity(disk, sdkp->capacity);
2509 * sd_unlock_native_capacity - unlock native capacity
2510 * @disk: struct gendisk to set capacity for
2512 * Block layer calls this function if it detects that partitions
2513 * on @disk reach beyond the end of the device. If the SCSI host
2514 * implements ->unlock_native_capacity() method, it's invoked to
2515 * give it a chance to adjust the device capacity.
2518 * Defined by block layer. Might sleep.
2520 static void sd_unlock_native_capacity(struct gendisk *disk)
2522 struct scsi_device *sdev = scsi_disk(disk)->device;
2524 if (sdev->host->hostt->unlock_native_capacity)
2525 sdev->host->hostt->unlock_native_capacity(sdev);
2529 * sd_format_disk_name - format disk name
2530 * @prefix: name prefix - ie. "sd" for SCSI disks
2531 * @index: index of the disk to format name for
2532 * @buf: output buffer
2533 * @buflen: length of the output buffer
2535 * SCSI disk names starts at sda. The 26th device is sdz and the
2536 * 27th is sdaa. The last one for two lettered suffix is sdzz
2537 * which is followed by sdaaa.
2539 * This is basically 26 base counting with one extra 'nil' entry
2540 * at the beginning from the second digit on and can be
2541 * determined using similar method as 26 base conversion with the
2542 * index shifted -1 after each digit is computed.
2548 * 0 on success, -errno on failure.
2550 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2552 const int base = 'z' - 'a' + 1;
2553 char *begin = buf + strlen(prefix);
2554 char *end = buf + buflen;
2564 *--p = 'a' + (index % unit);
2565 index = (index / unit) - 1;
2566 } while (index >= 0);
2568 memmove(begin, p, end - p);
2569 memcpy(buf, prefix, strlen(prefix));
2575 * The asynchronous part of sd_probe
2577 static void sd_probe_async(void *data, async_cookie_t cookie)
2579 struct scsi_disk *sdkp = data;
2580 struct scsi_device *sdp;
2587 index = sdkp->index;
2588 dev = &sdp->sdev_gendev;
2590 gd->major = sd_major((index & 0xf0) >> 4);
2591 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2592 gd->minors = SD_MINORS;
2594 gd->fops = &sd_fops;
2595 gd->private_data = &sdkp->driver;
2596 gd->queue = sdkp->device->request_queue;
2598 /* defaults, until the device tells us otherwise */
2599 sdp->sector_size = 512;
2601 sdkp->media_present = 1;
2602 sdkp->write_prot = 0;
2606 sdkp->first_scan = 1;
2607 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2609 sd_revalidate_disk(gd);
2611 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2612 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2614 gd->driverfs_dev = &sdp->sdev_gendev;
2615 gd->flags = GENHD_FL_EXT_DEVT;
2616 if (sdp->removable) {
2617 gd->flags |= GENHD_FL_REMOVABLE;
2618 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2622 sd_dif_config_host(sdkp);
2624 sd_revalidate_disk(gd);
2626 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2627 sdp->removable ? "removable " : "");
2628 scsi_autopm_put_device(sdp);
2629 put_device(&sdkp->dev);
2633 * sd_probe - called during driver initialization and whenever a
2634 * new scsi device is attached to the system. It is called once
2635 * for each scsi device (not just disks) present.
2636 * @dev: pointer to device object
2638 * Returns 0 if successful (or not interested in this scsi device
2639 * (e.g. scanner)); 1 when there is an error.
2641 * Note: this function is invoked from the scsi mid-level.
2642 * This function sets up the mapping between a given
2643 * <host,channel,id,lun> (found in sdp) and new device name
2644 * (e.g. /dev/sda). More precisely it is the block device major
2645 * and minor number that is chosen here.
2647 * Assume sd_attach is not re-entrant (for time being)
2648 * Also think about sd_attach() and sd_remove() running coincidentally.
2650 static int sd_probe(struct device *dev)
2652 struct scsi_device *sdp = to_scsi_device(dev);
2653 struct scsi_disk *sdkp;
2659 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2662 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2666 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2670 gd = alloc_disk(SD_MINORS);
2675 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2678 spin_lock(&sd_index_lock);
2679 error = ida_get_new(&sd_index_ida, &index);
2680 spin_unlock(&sd_index_lock);
2681 } while (error == -EAGAIN);
2684 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2688 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2690 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2691 goto out_free_index;
2695 sdkp->driver = &sd_template;
2697 sdkp->index = index;
2698 atomic_set(&sdkp->openers, 0);
2700 if (!sdp->request_queue->rq_timeout) {
2701 if (sdp->type != TYPE_MOD)
2702 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2704 blk_queue_rq_timeout(sdp->request_queue,
2708 device_initialize(&sdkp->dev);
2709 sdkp->dev.parent = dev;
2710 sdkp->dev.class = &sd_disk_class;
2711 dev_set_name(&sdkp->dev, dev_name(dev));
2713 if (device_add(&sdkp->dev))
2714 goto out_free_index;
2717 dev_set_drvdata(dev, sdkp);
2719 get_device(&sdkp->dev); /* prevent release before async_schedule */
2720 async_schedule(sd_probe_async, sdkp);
2725 spin_lock(&sd_index_lock);
2726 ida_remove(&sd_index_ida, index);
2727 spin_unlock(&sd_index_lock);
2737 * sd_remove - called whenever a scsi disk (previously recognized by
2738 * sd_probe) is detached from the system. It is called (potentially
2739 * multiple times) during sd module unload.
2740 * @sdp: pointer to mid level scsi device object
2742 * Note: this function is invoked from the scsi mid-level.
2743 * This function potentially frees up a device name (e.g. /dev/sdc)
2744 * that could be re-used by a subsequent sd_probe().
2745 * This function is not called when the built-in sd driver is "exit-ed".
2747 static int sd_remove(struct device *dev)
2749 struct scsi_disk *sdkp;
2751 sdkp = dev_get_drvdata(dev);
2752 scsi_autopm_get_device(sdkp->device);
2754 async_synchronize_full();
2755 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2756 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2757 device_del(&sdkp->dev);
2758 del_gendisk(sdkp->disk);
2761 mutex_lock(&sd_ref_mutex);
2762 dev_set_drvdata(dev, NULL);
2763 put_device(&sdkp->dev);
2764 mutex_unlock(&sd_ref_mutex);
2770 * scsi_disk_release - Called to free the scsi_disk structure
2771 * @dev: pointer to embedded class device
2773 * sd_ref_mutex must be held entering this routine. Because it is
2774 * called on last put, you should always use the scsi_disk_get()
2775 * scsi_disk_put() helpers which manipulate the semaphore directly
2776 * and never do a direct put_device.
2778 static void scsi_disk_release(struct device *dev)
2780 struct scsi_disk *sdkp = to_scsi_disk(dev);
2781 struct gendisk *disk = sdkp->disk;
2783 spin_lock(&sd_index_lock);
2784 ida_remove(&sd_index_ida, sdkp->index);
2785 spin_unlock(&sd_index_lock);
2787 disk->private_data = NULL;
2789 put_device(&sdkp->device->sdev_gendev);
2794 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2796 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2797 struct scsi_sense_hdr sshdr;
2798 struct scsi_device *sdp = sdkp->device;
2802 cmd[4] |= 1; /* START */
2804 if (sdp->start_stop_pwr_cond)
2805 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2807 if (!scsi_device_online(sdp))
2810 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2811 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2813 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2814 sd_print_result(sdkp, res);
2815 if (driver_byte(res) & DRIVER_SENSE)
2816 sd_print_sense_hdr(sdkp, &sshdr);
2823 * Send a SYNCHRONIZE CACHE instruction down to the device through
2824 * the normal SCSI command structure. Wait for the command to
2827 static void sd_shutdown(struct device *dev)
2829 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2832 return; /* this can happen */
2834 if (pm_runtime_suspended(dev))
2838 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2839 sd_sync_cache(sdkp);
2842 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2843 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2844 sd_start_stop_device(sdkp, 0);
2848 scsi_disk_put(sdkp);
2851 static int sd_suspend(struct device *dev, pm_message_t mesg)
2853 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2857 return 0; /* this can happen */
2860 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2861 ret = sd_sync_cache(sdkp);
2866 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2867 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2868 ret = sd_start_stop_device(sdkp, 0);
2872 scsi_disk_put(sdkp);
2876 static int sd_resume(struct device *dev)
2878 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2881 if (!sdkp->device->manage_start_stop)
2884 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2885 ret = sd_start_stop_device(sdkp, 1);
2888 scsi_disk_put(sdkp);
2893 * init_sd - entry point for this driver (both when built in or when
2896 * Note: this function registers this driver with the scsi mid-level.
2898 static int __init init_sd(void)
2900 int majors = 0, i, err;
2902 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2904 for (i = 0; i < SD_MAJORS; i++)
2905 if (register_blkdev(sd_major(i), "sd") == 0)
2911 err = class_register(&sd_disk_class);
2915 err = scsi_register_driver(&sd_template.gendrv);
2919 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2921 if (!sd_cdb_cache) {
2922 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2926 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2928 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2935 kmem_cache_destroy(sd_cdb_cache);
2938 class_unregister(&sd_disk_class);
2940 for (i = 0; i < SD_MAJORS; i++)
2941 unregister_blkdev(sd_major(i), "sd");
2946 * exit_sd - exit point for this driver (when it is a module).
2948 * Note: this function unregisters this driver from the scsi mid-level.
2950 static void __exit exit_sd(void)
2954 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2956 mempool_destroy(sd_cdb_pool);
2957 kmem_cache_destroy(sd_cdb_cache);
2959 scsi_unregister_driver(&sd_template.gendrv);
2960 class_unregister(&sd_disk_class);
2962 for (i = 0; i < SD_MAJORS; i++)
2963 unregister_blkdev(sd_major(i), "sd");
2966 module_init(init_sd);
2967 module_exit(exit_sd);
2969 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2970 struct scsi_sense_hdr *sshdr)
2972 sd_printk(KERN_INFO, sdkp, " ");
2973 scsi_show_sense_hdr(sshdr);
2974 sd_printk(KERN_INFO, sdkp, " ");
2975 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2978 static void sd_print_result(struct scsi_disk *sdkp, int result)
2980 sd_printk(KERN_INFO, sdkp, " ");
2981 scsi_show_result(result);