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 int sd_revalidate_disk(struct gendisk *);
103 static void sd_unlock_native_capacity(struct gendisk *disk);
104 static int sd_probe(struct device *);
105 static int sd_remove(struct device *);
106 static void sd_shutdown(struct device *);
107 static int sd_suspend(struct device *, pm_message_t state);
108 static int sd_resume(struct device *);
109 static void sd_rescan(struct device *);
110 static int sd_done(struct scsi_cmnd *);
111 static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
112 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
113 static void scsi_disk_release(struct device *cdev);
114 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
115 static void sd_print_result(struct scsi_disk *, int);
117 static DEFINE_SPINLOCK(sd_index_lock);
118 static DEFINE_IDA(sd_index_ida);
120 /* This semaphore is used to mediate the 0->1 reference get in the
121 * face of object destruction (i.e. we can't allow a get on an
122 * object after last put) */
123 static DEFINE_MUTEX(sd_ref_mutex);
125 static struct kmem_cache *sd_cdb_cache;
126 static mempool_t *sd_cdb_pool;
128 static const char *sd_cache_types[] = {
129 "write through", "none", "write back",
130 "write back, no read (daft)"
134 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
135 const char *buf, size_t count)
137 int i, ct = -1, rcd, wce, sp;
138 struct scsi_disk *sdkp = to_scsi_disk(dev);
139 struct scsi_device *sdp = sdkp->device;
142 struct scsi_mode_data data;
143 struct scsi_sense_hdr sshdr;
146 if (sdp->type != TYPE_DISK)
147 /* no cache control on RBC devices; theoretically they
148 * can do it, but there's probably so many exceptions
149 * it's not worth the risk */
152 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
153 len = strlen(sd_cache_types[i]);
154 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
162 rcd = ct & 0x01 ? 1 : 0;
163 wce = ct & 0x02 ? 1 : 0;
164 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
165 SD_MAX_RETRIES, &data, NULL))
167 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
168 data.block_descriptor_length);
169 buffer_data = buffer + data.header_length +
170 data.block_descriptor_length;
171 buffer_data[2] &= ~0x05;
172 buffer_data[2] |= wce << 2 | rcd;
173 sp = buffer_data[0] & 0x80 ? 1 : 0;
175 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
176 SD_MAX_RETRIES, &data, &sshdr)) {
177 if (scsi_sense_valid(&sshdr))
178 sd_print_sense_hdr(sdkp, &sshdr);
181 revalidate_disk(sdkp->disk);
186 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
187 const char *buf, size_t count)
189 struct scsi_disk *sdkp = to_scsi_disk(dev);
190 struct scsi_device *sdp = sdkp->device;
192 if (!capable(CAP_SYS_ADMIN))
195 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
201 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
202 const char *buf, size_t count)
204 struct scsi_disk *sdkp = to_scsi_disk(dev);
205 struct scsi_device *sdp = sdkp->device;
207 if (!capable(CAP_SYS_ADMIN))
210 if (sdp->type != TYPE_DISK)
213 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
219 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
222 struct scsi_disk *sdkp = to_scsi_disk(dev);
223 int ct = sdkp->RCD + 2*sdkp->WCE;
225 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
229 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
231 struct scsi_disk *sdkp = to_scsi_disk(dev);
233 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
237 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
240 struct scsi_disk *sdkp = to_scsi_disk(dev);
241 struct scsi_device *sdp = sdkp->device;
243 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
247 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
250 struct scsi_disk *sdkp = to_scsi_disk(dev);
252 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
256 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
259 struct scsi_disk *sdkp = to_scsi_disk(dev);
261 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
265 sd_store_protection_type(struct device *dev, struct device_attribute *attr,
266 const char *buf, size_t count)
268 struct scsi_disk *sdkp = to_scsi_disk(dev);
272 if (!capable(CAP_SYS_ADMIN))
275 err = kstrtouint(buf, 10, &val);
280 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
281 sdkp->protection_type = val;
287 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
290 struct scsi_disk *sdkp = to_scsi_disk(dev);
291 struct scsi_device *sdp = sdkp->device;
292 unsigned int dif, dix;
294 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
295 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
297 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
303 return snprintf(buf, 20, "none\n");
305 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
309 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
312 struct scsi_disk *sdkp = to_scsi_disk(dev);
314 return snprintf(buf, 20, "%u\n", sdkp->ATO);
318 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
321 struct scsi_disk *sdkp = to_scsi_disk(dev);
323 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
326 static const char *lbp_mode[] = {
327 [SD_LBP_FULL] = "full",
328 [SD_LBP_UNMAP] = "unmap",
329 [SD_LBP_WS16] = "writesame_16",
330 [SD_LBP_WS10] = "writesame_10",
331 [SD_LBP_ZERO] = "writesame_zero",
332 [SD_LBP_DISABLE] = "disabled",
336 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
339 struct scsi_disk *sdkp = to_scsi_disk(dev);
341 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
345 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
346 const char *buf, size_t count)
348 struct scsi_disk *sdkp = to_scsi_disk(dev);
349 struct scsi_device *sdp = sdkp->device;
351 if (!capable(CAP_SYS_ADMIN))
354 if (sdp->type != TYPE_DISK)
357 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
358 sd_config_discard(sdkp, SD_LBP_UNMAP);
359 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
360 sd_config_discard(sdkp, SD_LBP_WS16);
361 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
362 sd_config_discard(sdkp, SD_LBP_WS10);
363 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
364 sd_config_discard(sdkp, SD_LBP_ZERO);
365 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
366 sd_config_discard(sdkp, SD_LBP_DISABLE);
374 sd_show_max_medium_access_timeouts(struct device *dev,
375 struct device_attribute *attr, char *buf)
377 struct scsi_disk *sdkp = to_scsi_disk(dev);
379 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
383 sd_store_max_medium_access_timeouts(struct device *dev,
384 struct device_attribute *attr,
385 const char *buf, size_t count)
387 struct scsi_disk *sdkp = to_scsi_disk(dev);
390 if (!capable(CAP_SYS_ADMIN))
393 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
395 return err ? err : count;
398 static struct device_attribute sd_disk_attrs[] = {
399 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
400 sd_store_cache_type),
401 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
402 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
403 sd_store_allow_restart),
404 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
405 sd_store_manage_start_stop),
406 __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
407 sd_store_protection_type),
408 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
409 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
410 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
411 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
412 sd_store_provisioning_mode),
413 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
414 sd_show_max_medium_access_timeouts,
415 sd_store_max_medium_access_timeouts),
419 static struct class sd_disk_class = {
421 .owner = THIS_MODULE,
422 .dev_release = scsi_disk_release,
423 .dev_attrs = sd_disk_attrs,
426 static struct scsi_driver sd_template = {
427 .owner = THIS_MODULE,
432 .suspend = sd_suspend,
434 .shutdown = sd_shutdown,
438 .eh_action = sd_eh_action,
442 * Device no to disk mapping:
444 * major disc2 disc p1
445 * |............|.............|....|....| <- dev_t
448 * Inside a major, we have 16k disks, however mapped non-
449 * contiguously. The first 16 disks are for major0, the next
450 * ones with major1, ... Disk 256 is for major0 again, disk 272
452 * As we stay compatible with our numbering scheme, we can reuse
453 * the well-know SCSI majors 8, 65--71, 136--143.
455 static int sd_major(int major_idx)
459 return SCSI_DISK0_MAJOR;
461 return SCSI_DISK1_MAJOR + major_idx - 1;
463 return SCSI_DISK8_MAJOR + major_idx - 8;
466 return 0; /* shut up gcc */
470 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
472 struct scsi_disk *sdkp = NULL;
474 if (disk->private_data) {
475 sdkp = scsi_disk(disk);
476 if (scsi_device_get(sdkp->device) == 0)
477 get_device(&sdkp->dev);
484 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
486 struct scsi_disk *sdkp;
488 mutex_lock(&sd_ref_mutex);
489 sdkp = __scsi_disk_get(disk);
490 mutex_unlock(&sd_ref_mutex);
494 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
496 struct scsi_disk *sdkp;
498 mutex_lock(&sd_ref_mutex);
499 sdkp = dev_get_drvdata(dev);
501 sdkp = __scsi_disk_get(sdkp->disk);
502 mutex_unlock(&sd_ref_mutex);
506 static void scsi_disk_put(struct scsi_disk *sdkp)
508 struct scsi_device *sdev = sdkp->device;
510 mutex_lock(&sd_ref_mutex);
511 put_device(&sdkp->dev);
512 scsi_device_put(sdev);
513 mutex_unlock(&sd_ref_mutex);
516 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
518 unsigned int prot_op = SCSI_PROT_NORMAL;
519 unsigned int dix = scsi_prot_sg_count(scmd);
521 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
523 prot_op = SCSI_PROT_READ_PASS;
524 else if (dif && !dix)
525 prot_op = SCSI_PROT_READ_STRIP;
526 else if (!dif && dix)
527 prot_op = SCSI_PROT_READ_INSERT;
530 prot_op = SCSI_PROT_WRITE_PASS;
531 else if (dif && !dix)
532 prot_op = SCSI_PROT_WRITE_INSERT;
533 else if (!dif && dix)
534 prot_op = SCSI_PROT_WRITE_STRIP;
537 scsi_set_prot_op(scmd, prot_op);
538 scsi_set_prot_type(scmd, dif);
541 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
543 struct request_queue *q = sdkp->disk->queue;
544 unsigned int logical_block_size = sdkp->device->sector_size;
545 unsigned int max_blocks = 0;
547 q->limits.discard_zeroes_data = sdkp->lbprz;
548 q->limits.discard_alignment = sdkp->unmap_alignment *
550 q->limits.discard_granularity =
551 max(sdkp->physical_block_size,
552 sdkp->unmap_granularity * logical_block_size);
554 sdkp->provisioning_mode = mode;
559 q->limits.max_discard_sectors = 0;
560 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
564 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
568 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
572 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
576 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
577 q->limits.discard_zeroes_data = 1;
581 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
582 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
586 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
587 * @sdp: scsi device to operate one
588 * @rq: Request to prepare
590 * Will issue either UNMAP or WRITE SAME(16) depending on preference
591 * indicated by target device.
593 static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
595 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
596 sector_t sector = blk_rq_pos(rq);
597 unsigned int nr_sectors = blk_rq_sectors(rq);
598 unsigned int nr_bytes = blk_rq_bytes(rq);
604 sector >>= ilog2(sdp->sector_size) - 9;
605 nr_sectors >>= ilog2(sdp->sector_size) - 9;
606 rq->timeout = SD_TIMEOUT;
608 memset(rq->cmd, 0, rq->cmd_len);
610 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
612 return BLKPREP_DEFER;
614 switch (sdkp->provisioning_mode) {
616 buf = page_address(page);
622 put_unaligned_be16(6 + 16, &buf[0]);
623 put_unaligned_be16(16, &buf[2]);
624 put_unaligned_be64(sector, &buf[8]);
625 put_unaligned_be32(nr_sectors, &buf[16]);
632 rq->cmd[0] = WRITE_SAME_16;
633 rq->cmd[1] = 0x8; /* UNMAP */
634 put_unaligned_be64(sector, &rq->cmd[2]);
635 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
637 len = sdkp->device->sector_size;
643 rq->cmd[0] = WRITE_SAME;
644 if (sdkp->provisioning_mode == SD_LBP_WS10)
645 rq->cmd[1] = 0x8; /* UNMAP */
646 put_unaligned_be32(sector, &rq->cmd[2]);
647 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
649 len = sdkp->device->sector_size;
657 blk_add_request_payload(rq, page, len);
658 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
659 rq->buffer = page_address(page);
660 rq->__data_len = nr_bytes;
663 if (ret != BLKPREP_OK) {
670 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
672 rq->timeout = SD_FLUSH_TIMEOUT;
673 rq->retries = SD_MAX_RETRIES;
674 rq->cmd[0] = SYNCHRONIZE_CACHE;
677 return scsi_setup_blk_pc_cmnd(sdp, rq);
680 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
682 if (rq->cmd_flags & REQ_DISCARD) {
683 free_page((unsigned long)rq->buffer);
689 * sd_prep_fn - build a scsi (read or write) command from
690 * information in the request structure.
691 * @SCpnt: pointer to mid-level's per scsi command structure that
692 * contains request and into which the scsi command is written
694 * Returns 1 if successful and 0 if error (or cannot be done now).
696 static int sd_prep_fn(struct request_queue *q, struct request *rq)
698 struct scsi_cmnd *SCpnt;
699 struct scsi_device *sdp = q->queuedata;
700 struct gendisk *disk = rq->rq_disk;
701 struct scsi_disk *sdkp;
702 sector_t block = blk_rq_pos(rq);
704 unsigned int this_count = blk_rq_sectors(rq);
706 unsigned char protect;
709 * Discard request come in as REQ_TYPE_FS but we turn them into
710 * block PC requests to make life easier.
712 if (rq->cmd_flags & REQ_DISCARD) {
713 ret = sd_setup_discard_cmnd(sdp, rq);
715 } else if (rq->cmd_flags & REQ_FLUSH) {
716 ret = scsi_setup_flush_cmnd(sdp, rq);
718 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
719 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
721 } else if (rq->cmd_type != REQ_TYPE_FS) {
725 ret = scsi_setup_fs_cmnd(sdp, rq);
726 if (ret != BLKPREP_OK)
729 sdkp = scsi_disk(disk);
731 /* from here on until we're complete, any goto out
732 * is used for a killable error condition */
735 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
736 "sd_prep_fn: block=%llu, "
738 (unsigned long long)block,
741 if (!sdp || !scsi_device_online(sdp) ||
742 block + blk_rq_sectors(rq) > get_capacity(disk)) {
743 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
744 "Finishing %u sectors\n",
745 blk_rq_sectors(rq)));
746 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
747 "Retry with 0x%p\n", SCpnt));
753 * quietly refuse to do anything to a changed disc until
754 * the changed bit has been reset
756 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
761 * Some SD card readers can't handle multi-sector accesses which touch
762 * the last one or two hardware sectors. Split accesses as needed.
764 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
765 (sdp->sector_size / 512);
767 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
768 if (block < threshold) {
769 /* Access up to the threshold but not beyond */
770 this_count = threshold - block;
772 /* Access only a single hardware sector */
773 this_count = sdp->sector_size / 512;
777 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
778 (unsigned long long)block));
781 * If we have a 1K hardware sectorsize, prevent access to single
782 * 512 byte sectors. In theory we could handle this - in fact
783 * the scsi cdrom driver must be able to handle this because
784 * we typically use 1K blocksizes, and cdroms typically have
785 * 2K hardware sectorsizes. Of course, things are simpler
786 * with the cdrom, since it is read-only. For performance
787 * reasons, the filesystems should be able to handle this
788 * and not force the scsi disk driver to use bounce buffers
791 if (sdp->sector_size == 1024) {
792 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
793 scmd_printk(KERN_ERR, SCpnt,
794 "Bad block number requested\n");
798 this_count = this_count >> 1;
801 if (sdp->sector_size == 2048) {
802 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
803 scmd_printk(KERN_ERR, SCpnt,
804 "Bad block number requested\n");
808 this_count = this_count >> 2;
811 if (sdp->sector_size == 4096) {
812 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
813 scmd_printk(KERN_ERR, SCpnt,
814 "Bad block number requested\n");
818 this_count = this_count >> 3;
821 if (rq_data_dir(rq) == WRITE) {
822 if (!sdp->writeable) {
825 SCpnt->cmnd[0] = WRITE_6;
826 SCpnt->sc_data_direction = DMA_TO_DEVICE;
828 if (blk_integrity_rq(rq))
829 sd_dif_prepare(rq, block, sdp->sector_size);
831 } else if (rq_data_dir(rq) == READ) {
832 SCpnt->cmnd[0] = READ_6;
833 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
835 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
839 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
840 "%s %d/%u 512 byte blocks.\n",
841 (rq_data_dir(rq) == WRITE) ?
842 "writing" : "reading", this_count,
843 blk_rq_sectors(rq)));
845 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
846 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
852 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
853 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
855 if (unlikely(SCpnt->cmnd == NULL)) {
860 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
861 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
862 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
863 SCpnt->cmnd[7] = 0x18;
864 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
865 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
868 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
869 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
870 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
871 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
872 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
873 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
874 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
875 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
877 /* Expected Indirect LBA */
878 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
879 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
880 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
881 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
883 /* Transfer length */
884 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
885 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
886 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
887 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
888 } else if (block > 0xffffffff) {
889 SCpnt->cmnd[0] += READ_16 - READ_6;
890 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
891 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
892 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
893 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
894 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
895 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
896 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
897 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
898 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
899 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
900 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
901 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
902 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
903 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
904 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
905 scsi_device_protection(SCpnt->device) ||
906 SCpnt->device->use_10_for_rw) {
907 if (this_count > 0xffff)
910 SCpnt->cmnd[0] += READ_10 - READ_6;
911 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
912 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
913 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
914 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
915 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
916 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
917 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
918 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
920 if (unlikely(rq->cmd_flags & REQ_FUA)) {
922 * This happens only if this drive failed
923 * 10byte rw command with ILLEGAL_REQUEST
924 * during operation and thus turned off
927 scmd_printk(KERN_ERR, SCpnt,
928 "FUA write on READ/WRITE(6) drive\n");
932 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
933 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
934 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
935 SCpnt->cmnd[4] = (unsigned char) this_count;
938 SCpnt->sdb.length = this_count * sdp->sector_size;
940 /* If DIF or DIX is enabled, tell HBA how to handle request */
941 if (host_dif || scsi_prot_sg_count(SCpnt))
942 sd_prot_op(SCpnt, host_dif);
945 * We shouldn't disconnect in the middle of a sector, so with a dumb
946 * host adapter, it's safe to assume that we can at least transfer
947 * this many bytes between each connect / disconnect.
949 SCpnt->transfersize = sdp->sector_size;
950 SCpnt->underflow = this_count << 9;
951 SCpnt->allowed = SD_MAX_RETRIES;
954 * This indicates that the command is ready from our end to be
959 return scsi_prep_return(q, rq, ret);
963 * sd_open - open a scsi disk device
964 * @inode: only i_rdev member may be used
965 * @filp: only f_mode and f_flags may be used
967 * Returns 0 if successful. Returns a negated errno value in case
970 * Note: This can be called from a user context (e.g. fsck(1) )
971 * or from within the kernel (e.g. as a result of a mount(1) ).
972 * In the latter case @inode and @filp carry an abridged amount
973 * of information as noted above.
975 * Locking: called with bdev->bd_mutex held.
977 static int sd_open(struct block_device *bdev, fmode_t mode)
979 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
980 struct scsi_device *sdev;
986 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
990 retval = scsi_autopm_get_device(sdev);
995 * If the device is in error recovery, wait until it is done.
996 * If the device is offline, then disallow any access to it.
999 if (!scsi_block_when_processing_errors(sdev))
1002 if (sdev->removable || sdkp->write_prot)
1003 check_disk_change(bdev);
1006 * If the drive is empty, just let the open fail.
1008 retval = -ENOMEDIUM;
1009 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1013 * If the device has the write protect tab set, have the open fail
1014 * if the user expects to be able to write to the thing.
1017 if (sdkp->write_prot && (mode & FMODE_WRITE))
1021 * It is possible that the disk changing stuff resulted in
1022 * the device being taken offline. If this is the case,
1023 * report this to the user, and don't pretend that the
1024 * open actually succeeded.
1027 if (!scsi_device_online(sdev))
1030 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1031 if (scsi_block_when_processing_errors(sdev))
1032 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1038 scsi_autopm_put_device(sdev);
1040 scsi_disk_put(sdkp);
1045 * sd_release - invoked when the (last) close(2) is called on this
1047 * @inode: only i_rdev member may be used
1048 * @filp: only f_mode and f_flags may be used
1052 * Note: may block (uninterruptible) if error recovery is underway
1055 * Locking: called with bdev->bd_mutex held.
1057 static int sd_release(struct gendisk *disk, fmode_t mode)
1059 struct scsi_disk *sdkp = scsi_disk(disk);
1060 struct scsi_device *sdev = sdkp->device;
1062 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1064 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1065 if (scsi_block_when_processing_errors(sdev))
1066 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1070 * XXX and what if there are packets in flight and this close()
1071 * XXX is followed by a "rmmod sd_mod"?
1074 scsi_autopm_put_device(sdev);
1075 scsi_disk_put(sdkp);
1079 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1081 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1082 struct scsi_device *sdp = sdkp->device;
1083 struct Scsi_Host *host = sdp->host;
1086 /* default to most commonly used values */
1087 diskinfo[0] = 0x40; /* 1 << 6 */
1088 diskinfo[1] = 0x20; /* 1 << 5 */
1089 diskinfo[2] = sdkp->capacity >> 11;
1091 /* override with calculated, extended default, or driver values */
1092 if (host->hostt->bios_param)
1093 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1095 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1097 geo->heads = diskinfo[0];
1098 geo->sectors = diskinfo[1];
1099 geo->cylinders = diskinfo[2];
1104 * sd_ioctl - process an ioctl
1105 * @inode: only i_rdev/i_bdev members may be used
1106 * @filp: only f_mode and f_flags may be used
1107 * @cmd: ioctl command number
1108 * @arg: this is third argument given to ioctl(2) system call.
1109 * Often contains a pointer.
1111 * Returns 0 if successful (some ioctls return positive numbers on
1112 * success as well). Returns a negated errno value in case of error.
1114 * Note: most ioctls are forward onto the block subsystem or further
1115 * down in the scsi subsystem.
1117 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1118 unsigned int cmd, unsigned long arg)
1120 struct gendisk *disk = bdev->bd_disk;
1121 struct scsi_disk *sdkp = scsi_disk(disk);
1122 struct scsi_device *sdp = sdkp->device;
1123 void __user *p = (void __user *)arg;
1126 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1127 "cmd=0x%x\n", disk->disk_name, cmd));
1129 error = scsi_verify_blk_ioctl(bdev, cmd);
1134 * If we are in the middle of error recovery, don't let anyone
1135 * else try and use this device. Also, if error recovery fails, it
1136 * may try and take the device offline, in which case all further
1137 * access to the device is prohibited.
1139 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1140 (mode & FMODE_NDELAY) != 0);
1141 if (!scsi_block_when_processing_errors(sdp) || !error)
1145 * Send SCSI addressing ioctls directly to mid level, send other
1146 * ioctls to block level and then onto mid level if they can't be
1150 case SCSI_IOCTL_GET_IDLUN:
1151 case SCSI_IOCTL_GET_BUS_NUMBER:
1152 error = scsi_ioctl(sdp, cmd, p);
1155 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1156 if (error != -ENOTTY)
1158 error = scsi_ioctl(sdp, cmd, p);
1165 static void set_media_not_present(struct scsi_disk *sdkp)
1167 if (sdkp->media_present)
1168 sdkp->device->changed = 1;
1170 if (sdkp->device->removable) {
1171 sdkp->media_present = 0;
1176 static int media_not_present(struct scsi_disk *sdkp,
1177 struct scsi_sense_hdr *sshdr)
1179 if (!scsi_sense_valid(sshdr))
1182 /* not invoked for commands that could return deferred errors */
1183 switch (sshdr->sense_key) {
1184 case UNIT_ATTENTION:
1186 /* medium not present */
1187 if (sshdr->asc == 0x3A) {
1188 set_media_not_present(sdkp);
1196 * sd_check_events - check media events
1197 * @disk: kernel device descriptor
1198 * @clearing: disk events currently being cleared
1200 * Returns mask of DISK_EVENT_*.
1202 * Note: this function is invoked from the block subsystem.
1204 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1206 struct scsi_disk *sdkp = scsi_disk(disk);
1207 struct scsi_device *sdp = sdkp->device;
1208 struct scsi_sense_hdr *sshdr = NULL;
1211 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1214 * If the device is offline, don't send any commands - just pretend as
1215 * if the command failed. If the device ever comes back online, we
1216 * can deal with it then. It is only because of unrecoverable errors
1217 * that we would ever take a device offline in the first place.
1219 if (!scsi_device_online(sdp)) {
1220 set_media_not_present(sdkp);
1225 * Using TEST_UNIT_READY enables differentiation between drive with
1226 * no cartridge loaded - NOT READY, drive with changed cartridge -
1227 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1229 * Drives that auto spin down. eg iomega jaz 1G, will be started
1230 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1231 * sd_revalidate() is called.
1235 if (scsi_block_when_processing_errors(sdp)) {
1236 retval = scsi_autopm_get_device(sdp);
1240 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1241 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1243 scsi_autopm_put_device(sdp);
1246 /* failed to execute TUR, assume media not present */
1247 if (host_byte(retval)) {
1248 set_media_not_present(sdkp);
1252 if (media_not_present(sdkp, sshdr))
1256 * For removable scsi disk we have to recognise the presence
1257 * of a disk in the drive.
1259 if (!sdkp->media_present)
1261 sdkp->media_present = 1;
1264 * sdp->changed is set under the following conditions:
1266 * Medium present state has changed in either direction.
1267 * Device has indicated UNIT_ATTENTION.
1270 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1275 static int sd_sync_cache(struct scsi_disk *sdkp)
1278 struct scsi_device *sdp = sdkp->device;
1279 struct scsi_sense_hdr sshdr;
1281 if (!scsi_device_online(sdp))
1285 for (retries = 3; retries > 0; --retries) {
1286 unsigned char cmd[10] = { 0 };
1288 cmd[0] = SYNCHRONIZE_CACHE;
1290 * Leave the rest of the command zero to indicate
1293 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1294 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1300 sd_print_result(sdkp, res);
1301 if (driver_byte(res) & DRIVER_SENSE)
1302 sd_print_sense_hdr(sdkp, &sshdr);
1310 static void sd_rescan(struct device *dev)
1312 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1315 revalidate_disk(sdkp->disk);
1316 scsi_disk_put(sdkp);
1321 #ifdef CONFIG_COMPAT
1323 * This gets directly called from VFS. When the ioctl
1324 * is not recognized we go back to the other translation paths.
1326 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1327 unsigned int cmd, unsigned long arg)
1329 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1332 ret = scsi_verify_blk_ioctl(bdev, cmd);
1337 * If we are in the middle of error recovery, don't let anyone
1338 * else try and use this device. Also, if error recovery fails, it
1339 * may try and take the device offline, in which case all further
1340 * access to the device is prohibited.
1342 if (!scsi_block_when_processing_errors(sdev))
1345 if (sdev->host->hostt->compat_ioctl) {
1346 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1352 * Let the static ioctl translation table take care of it.
1354 return -ENOIOCTLCMD;
1358 static const struct block_device_operations sd_fops = {
1359 .owner = THIS_MODULE,
1361 .release = sd_release,
1363 .getgeo = sd_getgeo,
1364 #ifdef CONFIG_COMPAT
1365 .compat_ioctl = sd_compat_ioctl,
1367 .check_events = sd_check_events,
1368 .revalidate_disk = sd_revalidate_disk,
1369 .unlock_native_capacity = sd_unlock_native_capacity,
1373 * sd_eh_action - error handling callback
1374 * @scmd: sd-issued command that has failed
1375 * @eh_cmnd: The command that was sent during error handling
1376 * @eh_cmnd_len: Length of eh_cmnd in bytes
1377 * @eh_disp: The recovery disposition suggested by the midlayer
1379 * This function is called by the SCSI midlayer upon completion of
1380 * an error handling command (TEST UNIT READY, START STOP UNIT,
1381 * etc.) The command sent to the device by the error handler is
1382 * stored in eh_cmnd. The result of sending the eh command is
1383 * passed in eh_disp.
1385 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1386 int eh_cmnd_len, int eh_disp)
1388 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1390 if (!scsi_device_online(scmd->device) ||
1391 !scsi_medium_access_command(scmd))
1395 * The device has timed out executing a medium access command.
1396 * However, the TEST UNIT READY command sent during error
1397 * handling completed successfully. Either the device is in the
1398 * process of recovering or has it suffered an internal failure
1399 * that prevents access to the storage medium.
1401 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1402 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1403 sdkp->medium_access_timed_out++;
1406 * If the device keeps failing read/write commands but TEST UNIT
1407 * READY always completes successfully we assume that medium
1408 * access is no longer possible and take the device offline.
1410 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1411 scmd_printk(KERN_ERR, scmd,
1412 "Medium access timeout failure. Offlining disk!\n");
1413 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1421 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1423 u64 start_lba = blk_rq_pos(scmd->request);
1424 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1428 * resid is optional but mostly filled in. When it's unused,
1429 * its value is zero, so we assume the whole buffer transferred
1431 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1432 unsigned int good_bytes;
1434 if (scmd->request->cmd_type != REQ_TYPE_FS)
1437 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1438 SCSI_SENSE_BUFFERSIZE,
1443 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1446 if (scmd->device->sector_size < 512) {
1447 /* only legitimate sector_size here is 256 */
1451 /* be careful ... don't want any overflows */
1452 u64 factor = scmd->device->sector_size / 512;
1453 do_div(start_lba, factor);
1454 do_div(end_lba, factor);
1457 /* The bad lba was reported incorrectly, we have no idea where
1460 if (bad_lba < start_lba || bad_lba >= end_lba)
1463 /* This computation should always be done in terms of
1464 * the resolution of the device's medium.
1466 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1467 return min(good_bytes, transferred);
1471 * sd_done - bottom half handler: called when the lower level
1472 * driver has completed (successfully or otherwise) a scsi command.
1473 * @SCpnt: mid-level's per command structure.
1475 * Note: potentially run from within an ISR. Must not block.
1477 static int sd_done(struct scsi_cmnd *SCpnt)
1479 int result = SCpnt->result;
1480 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1481 struct scsi_sense_hdr sshdr;
1482 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1483 struct request *req = SCpnt->request;
1484 int sense_valid = 0;
1485 int sense_deferred = 0;
1486 unsigned char op = SCpnt->cmnd[0];
1488 if (req->cmd_flags & REQ_DISCARD) {
1490 good_bytes = blk_rq_bytes(req);
1491 scsi_set_resid(SCpnt, 0);
1494 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1499 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1501 sense_deferred = scsi_sense_is_deferred(&sshdr);
1503 #ifdef CONFIG_SCSI_LOGGING
1504 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1506 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1507 "sd_done: sb[respc,sk,asc,"
1508 "ascq]=%x,%x,%x,%x\n",
1509 sshdr.response_code,
1510 sshdr.sense_key, sshdr.asc,
1514 if (driver_byte(result) != DRIVER_SENSE &&
1515 (!sense_valid || sense_deferred))
1518 sdkp->medium_access_timed_out = 0;
1520 switch (sshdr.sense_key) {
1521 case HARDWARE_ERROR:
1523 good_bytes = sd_completed_bytes(SCpnt);
1525 case RECOVERED_ERROR:
1526 good_bytes = scsi_bufflen(SCpnt);
1529 /* This indicates a false check condition, so ignore it. An
1530 * unknown amount of data was transferred so treat it as an
1533 scsi_print_sense("sd", SCpnt);
1535 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1537 case ABORTED_COMMAND:
1538 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1539 good_bytes = sd_completed_bytes(SCpnt);
1541 case ILLEGAL_REQUEST:
1542 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1543 good_bytes = sd_completed_bytes(SCpnt);
1544 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1545 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1546 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1547 sd_config_discard(sdkp, SD_LBP_DISABLE);
1553 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1554 sd_dif_complete(SCpnt, good_bytes);
1556 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1557 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1559 /* We have to print a failed command here as the
1560 * extended CDB gets freed before scsi_io_completion()
1564 scsi_print_command(SCpnt);
1566 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1575 * spinup disk - called only in sd_revalidate_disk()
1578 sd_spinup_disk(struct scsi_disk *sdkp)
1580 unsigned char cmd[10];
1581 unsigned long spintime_expire = 0;
1582 int retries, spintime;
1583 unsigned int the_result;
1584 struct scsi_sense_hdr sshdr;
1585 int sense_valid = 0;
1589 /* Spin up drives, as required. Only do this at boot time */
1590 /* Spinup needs to be done for module loads too. */
1595 cmd[0] = TEST_UNIT_READY;
1596 memset((void *) &cmd[1], 0, 9);
1598 the_result = scsi_execute_req(sdkp->device, cmd,
1601 SD_MAX_RETRIES, NULL);
1604 * If the drive has indicated to us that it
1605 * doesn't have any media in it, don't bother
1606 * with any more polling.
1608 if (media_not_present(sdkp, &sshdr))
1612 sense_valid = scsi_sense_valid(&sshdr);
1614 } while (retries < 3 &&
1615 (!scsi_status_is_good(the_result) ||
1616 ((driver_byte(the_result) & DRIVER_SENSE) &&
1617 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1619 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1620 /* no sense, TUR either succeeded or failed
1621 * with a status error */
1622 if(!spintime && !scsi_status_is_good(the_result)) {
1623 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1624 sd_print_result(sdkp, the_result);
1630 * The device does not want the automatic start to be issued.
1632 if (sdkp->device->no_start_on_add)
1635 if (sense_valid && sshdr.sense_key == NOT_READY) {
1636 if (sshdr.asc == 4 && sshdr.ascq == 3)
1637 break; /* manual intervention required */
1638 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1639 break; /* standby */
1640 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1641 break; /* unavailable */
1643 * Issue command to spin up drive when not ready
1646 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1647 cmd[0] = START_STOP;
1648 cmd[1] = 1; /* Return immediately */
1649 memset((void *) &cmd[2], 0, 8);
1650 cmd[4] = 1; /* Start spin cycle */
1651 if (sdkp->device->start_stop_pwr_cond)
1653 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1655 SD_TIMEOUT, SD_MAX_RETRIES,
1657 spintime_expire = jiffies + 100 * HZ;
1660 /* Wait 1 second for next try */
1665 * Wait for USB flash devices with slow firmware.
1666 * Yes, this sense key/ASC combination shouldn't
1667 * occur here. It's characteristic of these devices.
1669 } else if (sense_valid &&
1670 sshdr.sense_key == UNIT_ATTENTION &&
1671 sshdr.asc == 0x28) {
1673 spintime_expire = jiffies + 5 * HZ;
1676 /* Wait 1 second for next try */
1679 /* we don't understand the sense code, so it's
1680 * probably pointless to loop */
1682 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1683 sd_print_sense_hdr(sdkp, &sshdr);
1688 } while (spintime && time_before_eq(jiffies, spintime_expire));
1691 if (scsi_status_is_good(the_result))
1694 printk("not responding...\n");
1700 * Determine whether disk supports Data Integrity Field.
1702 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1704 struct scsi_device *sdp = sdkp->device;
1708 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1711 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1713 if (type > SD_DIF_TYPE3_PROTECTION)
1715 else if (scsi_host_dif_capable(sdp->host, type))
1718 if (sdkp->first_scan || type != sdkp->protection_type)
1721 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1722 " protection type %u. Disabling disk!\n",
1726 sd_printk(KERN_NOTICE, sdkp,
1727 "Enabling DIF Type %u protection\n", type);
1730 sd_printk(KERN_NOTICE, sdkp,
1731 "Disabling DIF Type %u protection\n", type);
1735 sdkp->protection_type = type;
1740 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1741 struct scsi_sense_hdr *sshdr, int sense_valid,
1744 sd_print_result(sdkp, the_result);
1745 if (driver_byte(the_result) & DRIVER_SENSE)
1746 sd_print_sense_hdr(sdkp, sshdr);
1748 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1751 * Set dirty bit for removable devices if not ready -
1752 * sometimes drives will not report this properly.
1754 if (sdp->removable &&
1755 sense_valid && sshdr->sense_key == NOT_READY)
1756 set_media_not_present(sdkp);
1759 * We used to set media_present to 0 here to indicate no media
1760 * in the drive, but some drives fail read capacity even with
1761 * media present, so we can't do that.
1763 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1767 #if RC16_LEN > SD_BUF_SIZE
1768 #error RC16_LEN must not be more than SD_BUF_SIZE
1771 #define READ_CAPACITY_RETRIES_ON_RESET 10
1773 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1774 unsigned char *buffer)
1776 unsigned char cmd[16];
1777 struct scsi_sense_hdr sshdr;
1778 int sense_valid = 0;
1780 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1781 unsigned int alignment;
1782 unsigned long long lba;
1783 unsigned sector_size;
1785 if (sdp->no_read_capacity_16)
1790 cmd[0] = SERVICE_ACTION_IN;
1791 cmd[1] = SAI_READ_CAPACITY_16;
1793 memset(buffer, 0, RC16_LEN);
1795 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1796 buffer, RC16_LEN, &sshdr,
1797 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1799 if (media_not_present(sdkp, &sshdr))
1803 sense_valid = scsi_sense_valid(&sshdr);
1805 sshdr.sense_key == ILLEGAL_REQUEST &&
1806 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1808 /* Invalid Command Operation Code or
1809 * Invalid Field in CDB, just retry
1810 * silently with RC10 */
1813 sshdr.sense_key == UNIT_ATTENTION &&
1814 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1815 /* Device reset might occur several times,
1816 * give it one more chance */
1817 if (--reset_retries > 0)
1822 } while (the_result && retries);
1825 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1826 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1830 sector_size = get_unaligned_be32(&buffer[8]);
1831 lba = get_unaligned_be64(&buffer[0]);
1833 if (sd_read_protection_type(sdkp, buffer) < 0) {
1838 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1839 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1840 "kernel compiled with support for large block "
1846 /* Logical blocks per physical block exponent */
1847 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1849 /* Lowest aligned logical block */
1850 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1851 blk_queue_alignment_offset(sdp->request_queue, alignment);
1852 if (alignment && sdkp->first_scan)
1853 sd_printk(KERN_NOTICE, sdkp,
1854 "physical block alignment offset: %u\n", alignment);
1856 if (buffer[14] & 0x80) { /* LBPME */
1859 if (buffer[14] & 0x40) /* LBPRZ */
1862 sd_config_discard(sdkp, SD_LBP_WS16);
1865 sdkp->capacity = lba + 1;
1869 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1870 unsigned char *buffer)
1872 unsigned char cmd[16];
1873 struct scsi_sense_hdr sshdr;
1874 int sense_valid = 0;
1876 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1878 unsigned sector_size;
1881 cmd[0] = READ_CAPACITY;
1882 memset(&cmd[1], 0, 9);
1883 memset(buffer, 0, 8);
1885 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1887 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1889 if (media_not_present(sdkp, &sshdr))
1893 sense_valid = scsi_sense_valid(&sshdr);
1895 sshdr.sense_key == UNIT_ATTENTION &&
1896 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1897 /* Device reset might occur several times,
1898 * give it one more chance */
1899 if (--reset_retries > 0)
1904 } while (the_result && retries);
1907 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1908 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1912 sector_size = get_unaligned_be32(&buffer[4]);
1913 lba = get_unaligned_be32(&buffer[0]);
1915 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1916 /* Some buggy (usb cardreader) devices return an lba of
1917 0xffffffff when the want to report a size of 0 (with
1918 which they really mean no media is present) */
1920 sdkp->physical_block_size = sector_size;
1924 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1925 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1926 "kernel compiled with support for large block "
1932 sdkp->capacity = lba + 1;
1933 sdkp->physical_block_size = sector_size;
1937 static int sd_try_rc16_first(struct scsi_device *sdp)
1939 if (sdp->host->max_cmd_len < 16)
1941 if (sdp->try_rc_10_first)
1943 if (sdp->scsi_level > SCSI_SPC_2)
1945 if (scsi_device_protection(sdp))
1951 * read disk capacity
1954 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1957 struct scsi_device *sdp = sdkp->device;
1958 sector_t old_capacity = sdkp->capacity;
1960 if (sd_try_rc16_first(sdp)) {
1961 sector_size = read_capacity_16(sdkp, sdp, buffer);
1962 if (sector_size == -EOVERFLOW)
1964 if (sector_size == -ENODEV)
1966 if (sector_size < 0)
1967 sector_size = read_capacity_10(sdkp, sdp, buffer);
1968 if (sector_size < 0)
1971 sector_size = read_capacity_10(sdkp, sdp, buffer);
1972 if (sector_size == -EOVERFLOW)
1974 if (sector_size < 0)
1976 if ((sizeof(sdkp->capacity) > 4) &&
1977 (sdkp->capacity > 0xffffffffULL)) {
1978 int old_sector_size = sector_size;
1979 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1980 "Trying to use READ CAPACITY(16).\n");
1981 sector_size = read_capacity_16(sdkp, sdp, buffer);
1982 if (sector_size < 0) {
1983 sd_printk(KERN_NOTICE, sdkp,
1984 "Using 0xffffffff as device size\n");
1985 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1986 sector_size = old_sector_size;
1992 /* Some devices are known to return the total number of blocks,
1993 * not the highest block number. Some devices have versions
1994 * which do this and others which do not. Some devices we might
1995 * suspect of doing this but we don't know for certain.
1997 * If we know the reported capacity is wrong, decrement it. If
1998 * we can only guess, then assume the number of blocks is even
1999 * (usually true but not always) and err on the side of lowering
2002 if (sdp->fix_capacity ||
2003 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2004 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2005 "from its reported value: %llu\n",
2006 (unsigned long long) sdkp->capacity);
2011 if (sector_size == 0) {
2013 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2017 if (sector_size != 512 &&
2018 sector_size != 1024 &&
2019 sector_size != 2048 &&
2020 sector_size != 4096 &&
2021 sector_size != 256) {
2022 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2025 * The user might want to re-format the drive with
2026 * a supported sectorsize. Once this happens, it
2027 * would be relatively trivial to set the thing up.
2028 * For this reason, we leave the thing in the table.
2032 * set a bogus sector size so the normal read/write
2033 * logic in the block layer will eventually refuse any
2034 * request on this device without tripping over power
2035 * of two sector size assumptions
2039 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2042 char cap_str_2[10], cap_str_10[10];
2043 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2045 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2047 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2048 sizeof(cap_str_10));
2050 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2051 sd_printk(KERN_NOTICE, sdkp,
2052 "%llu %d-byte logical blocks: (%s/%s)\n",
2053 (unsigned long long)sdkp->capacity,
2054 sector_size, cap_str_10, cap_str_2);
2056 if (sdkp->physical_block_size != sector_size)
2057 sd_printk(KERN_NOTICE, sdkp,
2058 "%u-byte physical blocks\n",
2059 sdkp->physical_block_size);
2063 /* Rescale capacity to 512-byte units */
2064 if (sector_size == 4096)
2065 sdkp->capacity <<= 3;
2066 else if (sector_size == 2048)
2067 sdkp->capacity <<= 2;
2068 else if (sector_size == 1024)
2069 sdkp->capacity <<= 1;
2070 else if (sector_size == 256)
2071 sdkp->capacity >>= 1;
2073 blk_queue_physical_block_size(sdp->request_queue,
2074 sdkp->physical_block_size);
2075 sdkp->device->sector_size = sector_size;
2078 /* called with buffer of length 512 */
2080 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2081 unsigned char *buffer, int len, struct scsi_mode_data *data,
2082 struct scsi_sense_hdr *sshdr)
2084 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2085 SD_TIMEOUT, SD_MAX_RETRIES, data,
2090 * read write protect setting, if possible - called only in sd_revalidate_disk()
2091 * called with buffer of length SD_BUF_SIZE
2094 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2097 struct scsi_device *sdp = sdkp->device;
2098 struct scsi_mode_data data;
2099 int old_wp = sdkp->write_prot;
2101 set_disk_ro(sdkp->disk, 0);
2102 if (sdp->skip_ms_page_3f) {
2103 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2107 if (sdp->use_192_bytes_for_3f) {
2108 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2111 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2112 * We have to start carefully: some devices hang if we ask
2113 * for more than is available.
2115 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2118 * Second attempt: ask for page 0 When only page 0 is
2119 * implemented, a request for page 3F may return Sense Key
2120 * 5: Illegal Request, Sense Code 24: Invalid field in
2123 if (!scsi_status_is_good(res))
2124 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2127 * Third attempt: ask 255 bytes, as we did earlier.
2129 if (!scsi_status_is_good(res))
2130 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2134 if (!scsi_status_is_good(res)) {
2135 sd_printk(KERN_WARNING, sdkp,
2136 "Test WP failed, assume Write Enabled\n");
2138 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2139 set_disk_ro(sdkp->disk, sdkp->write_prot);
2140 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2141 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2142 sdkp->write_prot ? "on" : "off");
2143 sd_printk(KERN_DEBUG, sdkp,
2144 "Mode Sense: %02x %02x %02x %02x\n",
2145 buffer[0], buffer[1], buffer[2], buffer[3]);
2151 * sd_read_cache_type - called only from sd_revalidate_disk()
2152 * called with buffer of length SD_BUF_SIZE
2155 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2158 struct scsi_device *sdp = sdkp->device;
2163 struct scsi_mode_data data;
2164 struct scsi_sense_hdr sshdr;
2165 int old_wce = sdkp->WCE;
2166 int old_rcd = sdkp->RCD;
2167 int old_dpofua = sdkp->DPOFUA;
2170 if (sdp->skip_ms_page_8) {
2171 if (sdp->type == TYPE_RBC)
2174 if (sdp->skip_ms_page_3f)
2177 if (sdp->use_192_bytes_for_3f)
2181 } else if (sdp->type == TYPE_RBC) {
2189 /* cautiously ask */
2190 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2193 if (!scsi_status_is_good(res))
2196 if (!data.header_length) {
2199 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2202 /* that went OK, now ask for the proper length */
2206 * We're only interested in the first three bytes, actually.
2207 * But the data cache page is defined for the first 20.
2211 else if (len > SD_BUF_SIZE) {
2212 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2213 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2216 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2220 if (len > first_len)
2221 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2224 if (scsi_status_is_good(res)) {
2225 int offset = data.header_length + data.block_descriptor_length;
2227 while (offset < len) {
2228 u8 page_code = buffer[offset] & 0x3F;
2229 u8 spf = buffer[offset] & 0x40;
2231 if (page_code == 8 || page_code == 6) {
2232 /* We're interested only in the first 3 bytes.
2234 if (len - offset <= 2) {
2235 sd_printk(KERN_ERR, sdkp, "Incomplete "
2236 "mode parameter data\n");
2239 modepage = page_code;
2243 /* Go to the next page */
2244 if (spf && len - offset > 3)
2245 offset += 4 + (buffer[offset+2] << 8) +
2247 else if (!spf && len - offset > 1)
2248 offset += 2 + buffer[offset+1];
2250 sd_printk(KERN_ERR, sdkp, "Incomplete "
2251 "mode parameter data\n");
2257 if (modepage == 0x3F) {
2258 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2261 } else if ((buffer[offset] & 0x3f) != modepage) {
2262 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2266 if (modepage == 8) {
2267 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2268 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2270 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2274 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2275 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2276 sd_printk(KERN_NOTICE, sdkp,
2277 "Uses READ/WRITE(6), disabling FUA\n");
2281 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2282 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2283 sd_printk(KERN_NOTICE, sdkp,
2284 "Write cache: %s, read cache: %s, %s\n",
2285 sdkp->WCE ? "enabled" : "disabled",
2286 sdkp->RCD ? "disabled" : "enabled",
2287 sdkp->DPOFUA ? "supports DPO and FUA"
2288 : "doesn't support DPO or FUA");
2294 if (scsi_sense_valid(&sshdr) &&
2295 sshdr.sense_key == ILLEGAL_REQUEST &&
2296 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2297 /* Invalid field in CDB */
2298 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2300 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2303 if (sdp->wce_default_on) {
2304 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2307 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2315 * The ATO bit indicates whether the DIF application tag is available
2316 * for use by the operating system.
2318 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2321 struct scsi_device *sdp = sdkp->device;
2322 struct scsi_mode_data data;
2323 struct scsi_sense_hdr sshdr;
2325 if (sdp->type != TYPE_DISK)
2328 if (sdkp->protection_type == 0)
2331 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2332 SD_MAX_RETRIES, &data, &sshdr);
2334 if (!scsi_status_is_good(res) || !data.header_length ||
2336 sd_printk(KERN_WARNING, sdkp,
2337 "getting Control mode page failed, assume no ATO\n");
2339 if (scsi_sense_valid(&sshdr))
2340 sd_print_sense_hdr(sdkp, &sshdr);
2345 offset = data.header_length + data.block_descriptor_length;
2347 if ((buffer[offset] & 0x3f) != 0x0a) {
2348 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2352 if ((buffer[offset + 5] & 0x80) == 0)
2361 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2362 * @disk: disk to query
2364 static void sd_read_block_limits(struct scsi_disk *sdkp)
2366 unsigned int sector_sz = sdkp->device->sector_size;
2367 const int vpd_len = 64;
2368 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2371 /* Block Limits VPD */
2372 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2375 blk_queue_io_min(sdkp->disk->queue,
2376 get_unaligned_be16(&buffer[6]) * sector_sz);
2377 blk_queue_io_opt(sdkp->disk->queue,
2378 get_unaligned_be32(&buffer[12]) * sector_sz);
2380 if (buffer[3] == 0x3c) {
2381 unsigned int lba_count, desc_count;
2383 sdkp->max_ws_blocks =
2384 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2390 lba_count = get_unaligned_be32(&buffer[20]);
2391 desc_count = get_unaligned_be32(&buffer[24]);
2393 if (lba_count && desc_count)
2394 sdkp->max_unmap_blocks = lba_count;
2396 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2398 if (buffer[32] & 0x80)
2399 sdkp->unmap_alignment =
2400 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2402 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2404 if (sdkp->max_unmap_blocks)
2405 sd_config_discard(sdkp, SD_LBP_UNMAP);
2407 sd_config_discard(sdkp, SD_LBP_WS16);
2409 } else { /* LBP VPD page tells us what to use */
2411 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2412 sd_config_discard(sdkp, SD_LBP_UNMAP);
2413 else if (sdkp->lbpws)
2414 sd_config_discard(sdkp, SD_LBP_WS16);
2415 else if (sdkp->lbpws10)
2416 sd_config_discard(sdkp, SD_LBP_WS10);
2418 sd_config_discard(sdkp, SD_LBP_DISABLE);
2427 * sd_read_block_characteristics - Query block dev. characteristics
2428 * @disk: disk to query
2430 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2432 unsigned char *buffer;
2434 const int vpd_len = 64;
2436 buffer = kmalloc(vpd_len, GFP_KERNEL);
2439 /* Block Device Characteristics VPD */
2440 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2443 rot = get_unaligned_be16(&buffer[4]);
2446 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2453 * sd_read_block_provisioning - Query provisioning VPD page
2454 * @disk: disk to query
2456 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2458 unsigned char *buffer;
2459 const int vpd_len = 8;
2461 if (sdkp->lbpme == 0)
2464 buffer = kmalloc(vpd_len, GFP_KERNEL);
2466 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2470 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2471 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2472 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2478 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2481 * Although VPD inquiries can go to SCSI-2 type devices,
2482 * some USB ones crash on receiving them, and the pages
2483 * we currently ask for are for SPC-3 and beyond
2485 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2491 * sd_revalidate_disk - called the first time a new disk is seen,
2492 * performs disk spin up, read_capacity, etc.
2493 * @disk: struct gendisk we care about
2495 static int sd_revalidate_disk(struct gendisk *disk)
2497 struct scsi_disk *sdkp = scsi_disk(disk);
2498 struct scsi_device *sdp = sdkp->device;
2499 unsigned char *buffer;
2502 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2503 "sd_revalidate_disk\n"));
2506 * If the device is offline, don't try and read capacity or any
2507 * of the other niceties.
2509 if (!scsi_device_online(sdp))
2512 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2514 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2515 "allocation failure.\n");
2519 sd_spinup_disk(sdkp);
2522 * Without media there is no reason to ask; moreover, some devices
2523 * react badly if we do.
2525 if (sdkp->media_present) {
2526 sd_read_capacity(sdkp, buffer);
2528 if (sd_try_extended_inquiry(sdp)) {
2529 sd_read_block_provisioning(sdkp);
2530 sd_read_block_limits(sdkp);
2531 sd_read_block_characteristics(sdkp);
2534 sd_read_write_protect_flag(sdkp, buffer);
2535 sd_read_cache_type(sdkp, buffer);
2536 sd_read_app_tag_own(sdkp, buffer);
2539 sdkp->first_scan = 0;
2542 * We now have all cache related info, determine how we deal
2543 * with flush requests.
2551 blk_queue_flush(sdkp->disk->queue, flush);
2553 set_capacity(disk, sdkp->capacity);
2561 * sd_unlock_native_capacity - unlock native capacity
2562 * @disk: struct gendisk to set capacity for
2564 * Block layer calls this function if it detects that partitions
2565 * on @disk reach beyond the end of the device. If the SCSI host
2566 * implements ->unlock_native_capacity() method, it's invoked to
2567 * give it a chance to adjust the device capacity.
2570 * Defined by block layer. Might sleep.
2572 static void sd_unlock_native_capacity(struct gendisk *disk)
2574 struct scsi_device *sdev = scsi_disk(disk)->device;
2576 if (sdev->host->hostt->unlock_native_capacity)
2577 sdev->host->hostt->unlock_native_capacity(sdev);
2581 * sd_format_disk_name - format disk name
2582 * @prefix: name prefix - ie. "sd" for SCSI disks
2583 * @index: index of the disk to format name for
2584 * @buf: output buffer
2585 * @buflen: length of the output buffer
2587 * SCSI disk names starts at sda. The 26th device is sdz and the
2588 * 27th is sdaa. The last one for two lettered suffix is sdzz
2589 * which is followed by sdaaa.
2591 * This is basically 26 base counting with one extra 'nil' entry
2592 * at the beginning from the second digit on and can be
2593 * determined using similar method as 26 base conversion with the
2594 * index shifted -1 after each digit is computed.
2600 * 0 on success, -errno on failure.
2602 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2604 const int base = 'z' - 'a' + 1;
2605 char *begin = buf + strlen(prefix);
2606 char *end = buf + buflen;
2616 *--p = 'a' + (index % unit);
2617 index = (index / unit) - 1;
2618 } while (index >= 0);
2620 memmove(begin, p, end - p);
2621 memcpy(buf, prefix, strlen(prefix));
2627 * The asynchronous part of sd_probe
2629 static void sd_probe_async(void *data, async_cookie_t cookie)
2631 struct scsi_disk *sdkp = data;
2632 struct scsi_device *sdp;
2639 index = sdkp->index;
2640 dev = &sdp->sdev_gendev;
2642 gd->major = sd_major((index & 0xf0) >> 4);
2643 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2644 gd->minors = SD_MINORS;
2646 gd->fops = &sd_fops;
2647 gd->private_data = &sdkp->driver;
2648 gd->queue = sdkp->device->request_queue;
2650 /* defaults, until the device tells us otherwise */
2651 sdp->sector_size = 512;
2653 sdkp->media_present = 1;
2654 sdkp->write_prot = 0;
2658 sdkp->first_scan = 1;
2659 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2661 sd_revalidate_disk(gd);
2663 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2664 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2666 gd->driverfs_dev = &sdp->sdev_gendev;
2667 gd->flags = GENHD_FL_EXT_DEVT;
2668 if (sdp->removable) {
2669 gd->flags |= GENHD_FL_REMOVABLE;
2670 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2675 sd_dif_config_host(sdkp);
2677 sd_revalidate_disk(gd);
2679 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2680 sdp->removable ? "removable " : "");
2681 scsi_autopm_put_device(sdp);
2682 put_device(&sdkp->dev);
2686 * sd_probe - called during driver initialization and whenever a
2687 * new scsi device is attached to the system. It is called once
2688 * for each scsi device (not just disks) present.
2689 * @dev: pointer to device object
2691 * Returns 0 if successful (or not interested in this scsi device
2692 * (e.g. scanner)); 1 when there is an error.
2694 * Note: this function is invoked from the scsi mid-level.
2695 * This function sets up the mapping between a given
2696 * <host,channel,id,lun> (found in sdp) and new device name
2697 * (e.g. /dev/sda). More precisely it is the block device major
2698 * and minor number that is chosen here.
2700 * Assume sd_probe is not re-entrant (for time being)
2701 * Also think about sd_probe() and sd_remove() running coincidentally.
2703 static int sd_probe(struct device *dev)
2705 struct scsi_device *sdp = to_scsi_device(dev);
2706 struct scsi_disk *sdkp;
2712 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2715 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2719 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2723 gd = alloc_disk(SD_MINORS);
2728 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2731 spin_lock(&sd_index_lock);
2732 error = ida_get_new(&sd_index_ida, &index);
2733 spin_unlock(&sd_index_lock);
2734 } while (error == -EAGAIN);
2737 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2741 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2743 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2744 goto out_free_index;
2748 sdkp->driver = &sd_template;
2750 sdkp->index = index;
2751 atomic_set(&sdkp->openers, 0);
2752 atomic_set(&sdkp->device->ioerr_cnt, 0);
2754 if (!sdp->request_queue->rq_timeout) {
2755 if (sdp->type != TYPE_MOD)
2756 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2758 blk_queue_rq_timeout(sdp->request_queue,
2762 device_initialize(&sdkp->dev);
2763 sdkp->dev.parent = dev;
2764 sdkp->dev.class = &sd_disk_class;
2765 dev_set_name(&sdkp->dev, dev_name(dev));
2767 if (device_add(&sdkp->dev))
2768 goto out_free_index;
2771 dev_set_drvdata(dev, sdkp);
2773 get_device(&sdkp->dev); /* prevent release before async_schedule */
2774 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2779 spin_lock(&sd_index_lock);
2780 ida_remove(&sd_index_ida, index);
2781 spin_unlock(&sd_index_lock);
2791 * sd_remove - called whenever a scsi disk (previously recognized by
2792 * sd_probe) is detached from the system. It is called (potentially
2793 * multiple times) during sd module unload.
2794 * @sdp: pointer to mid level scsi device object
2796 * Note: this function is invoked from the scsi mid-level.
2797 * This function potentially frees up a device name (e.g. /dev/sdc)
2798 * that could be re-used by a subsequent sd_probe().
2799 * This function is not called when the built-in sd driver is "exit-ed".
2801 static int sd_remove(struct device *dev)
2803 struct scsi_disk *sdkp;
2805 sdkp = dev_get_drvdata(dev);
2806 scsi_autopm_get_device(sdkp->device);
2808 async_synchronize_full_domain(&scsi_sd_probe_domain);
2809 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2810 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2811 device_del(&sdkp->dev);
2812 del_gendisk(sdkp->disk);
2815 mutex_lock(&sd_ref_mutex);
2816 dev_set_drvdata(dev, NULL);
2817 put_device(&sdkp->dev);
2818 mutex_unlock(&sd_ref_mutex);
2824 * scsi_disk_release - Called to free the scsi_disk structure
2825 * @dev: pointer to embedded class device
2827 * sd_ref_mutex must be held entering this routine. Because it is
2828 * called on last put, you should always use the scsi_disk_get()
2829 * scsi_disk_put() helpers which manipulate the semaphore directly
2830 * and never do a direct put_device.
2832 static void scsi_disk_release(struct device *dev)
2834 struct scsi_disk *sdkp = to_scsi_disk(dev);
2835 struct gendisk *disk = sdkp->disk;
2837 spin_lock(&sd_index_lock);
2838 ida_remove(&sd_index_ida, sdkp->index);
2839 spin_unlock(&sd_index_lock);
2841 disk->private_data = NULL;
2843 put_device(&sdkp->device->sdev_gendev);
2848 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2850 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2851 struct scsi_sense_hdr sshdr;
2852 struct scsi_device *sdp = sdkp->device;
2856 cmd[4] |= 1; /* START */
2858 if (sdp->start_stop_pwr_cond)
2859 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2861 if (!scsi_device_online(sdp))
2864 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2865 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2867 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2868 sd_print_result(sdkp, res);
2869 if (driver_byte(res) & DRIVER_SENSE)
2870 sd_print_sense_hdr(sdkp, &sshdr);
2877 * Send a SYNCHRONIZE CACHE instruction down to the device through
2878 * the normal SCSI command structure. Wait for the command to
2881 static void sd_shutdown(struct device *dev)
2883 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2886 return; /* this can happen */
2888 if (pm_runtime_suspended(dev))
2892 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2893 sd_sync_cache(sdkp);
2896 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2897 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2898 sd_start_stop_device(sdkp, 0);
2902 scsi_disk_put(sdkp);
2905 static int sd_suspend(struct device *dev, pm_message_t mesg)
2907 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2911 return 0; /* this can happen */
2914 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2915 ret = sd_sync_cache(sdkp);
2920 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2921 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2922 ret = sd_start_stop_device(sdkp, 0);
2926 scsi_disk_put(sdkp);
2930 static int sd_resume(struct device *dev)
2932 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2935 if (!sdkp->device->manage_start_stop)
2938 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2939 ret = sd_start_stop_device(sdkp, 1);
2942 scsi_disk_put(sdkp);
2947 * init_sd - entry point for this driver (both when built in or when
2950 * Note: this function registers this driver with the scsi mid-level.
2952 static int __init init_sd(void)
2954 int majors = 0, i, err;
2956 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2958 for (i = 0; i < SD_MAJORS; i++)
2959 if (register_blkdev(sd_major(i), "sd") == 0)
2965 err = class_register(&sd_disk_class);
2969 err = scsi_register_driver(&sd_template.gendrv);
2973 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2975 if (!sd_cdb_cache) {
2976 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2980 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2982 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2989 kmem_cache_destroy(sd_cdb_cache);
2992 class_unregister(&sd_disk_class);
2994 for (i = 0; i < SD_MAJORS; i++)
2995 unregister_blkdev(sd_major(i), "sd");
3000 * exit_sd - exit point for this driver (when it is a module).
3002 * Note: this function unregisters this driver from the scsi mid-level.
3004 static void __exit exit_sd(void)
3008 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3010 mempool_destroy(sd_cdb_pool);
3011 kmem_cache_destroy(sd_cdb_cache);
3013 scsi_unregister_driver(&sd_template.gendrv);
3014 class_unregister(&sd_disk_class);
3016 for (i = 0; i < SD_MAJORS; i++)
3017 unregister_blkdev(sd_major(i), "sd");
3020 module_init(init_sd);
3021 module_exit(exit_sd);
3023 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3024 struct scsi_sense_hdr *sshdr)
3026 sd_printk(KERN_INFO, sdkp, " ");
3027 scsi_show_sense_hdr(sshdr);
3028 sd_printk(KERN_INFO, sdkp, " ");
3029 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3032 static void sd_print_result(struct scsi_disk *sdkp, int result)
3034 sd_printk(KERN_INFO, sdkp, " ");
3035 scsi_show_result(result);