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_show_protection_mode(struct device *dev, struct device_attribute *attr,
268 struct scsi_disk *sdkp = to_scsi_disk(dev);
269 struct scsi_device *sdp = sdkp->device;
270 unsigned int dif, dix;
272 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
273 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
275 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
281 return snprintf(buf, 20, "none\n");
283 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
287 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
290 struct scsi_disk *sdkp = to_scsi_disk(dev);
292 return snprintf(buf, 20, "%u\n", sdkp->ATO);
296 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
299 struct scsi_disk *sdkp = to_scsi_disk(dev);
301 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
304 static const char *lbp_mode[] = {
305 [SD_LBP_FULL] = "full",
306 [SD_LBP_UNMAP] = "unmap",
307 [SD_LBP_WS16] = "writesame_16",
308 [SD_LBP_WS10] = "writesame_10",
309 [SD_LBP_ZERO] = "writesame_zero",
310 [SD_LBP_DISABLE] = "disabled",
314 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
317 struct scsi_disk *sdkp = to_scsi_disk(dev);
319 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
323 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
324 const char *buf, size_t count)
326 struct scsi_disk *sdkp = to_scsi_disk(dev);
327 struct scsi_device *sdp = sdkp->device;
329 if (!capable(CAP_SYS_ADMIN))
332 if (sdp->type != TYPE_DISK)
335 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
336 sd_config_discard(sdkp, SD_LBP_UNMAP);
337 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
338 sd_config_discard(sdkp, SD_LBP_WS16);
339 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
340 sd_config_discard(sdkp, SD_LBP_WS10);
341 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
342 sd_config_discard(sdkp, SD_LBP_ZERO);
343 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
344 sd_config_discard(sdkp, SD_LBP_DISABLE);
352 sd_show_max_medium_access_timeouts(struct device *dev,
353 struct device_attribute *attr, char *buf)
355 struct scsi_disk *sdkp = to_scsi_disk(dev);
357 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
361 sd_store_max_medium_access_timeouts(struct device *dev,
362 struct device_attribute *attr,
363 const char *buf, size_t count)
365 struct scsi_disk *sdkp = to_scsi_disk(dev);
368 if (!capable(CAP_SYS_ADMIN))
371 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
373 return err ? err : count;
376 static struct device_attribute sd_disk_attrs[] = {
377 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
378 sd_store_cache_type),
379 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
380 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
381 sd_store_allow_restart),
382 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
383 sd_store_manage_start_stop),
384 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
385 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
386 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
387 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
388 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
389 sd_store_provisioning_mode),
390 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
391 sd_show_max_medium_access_timeouts,
392 sd_store_max_medium_access_timeouts),
396 static struct class sd_disk_class = {
398 .owner = THIS_MODULE,
399 .dev_release = scsi_disk_release,
400 .dev_attrs = sd_disk_attrs,
403 static struct scsi_driver sd_template = {
404 .owner = THIS_MODULE,
409 .suspend = sd_suspend,
411 .shutdown = sd_shutdown,
415 .eh_action = sd_eh_action,
419 * Device no to disk mapping:
421 * major disc2 disc p1
422 * |............|.............|....|....| <- dev_t
425 * Inside a major, we have 16k disks, however mapped non-
426 * contiguously. The first 16 disks are for major0, the next
427 * ones with major1, ... Disk 256 is for major0 again, disk 272
429 * As we stay compatible with our numbering scheme, we can reuse
430 * the well-know SCSI majors 8, 65--71, 136--143.
432 static int sd_major(int major_idx)
436 return SCSI_DISK0_MAJOR;
438 return SCSI_DISK1_MAJOR + major_idx - 1;
440 return SCSI_DISK8_MAJOR + major_idx - 8;
443 return 0; /* shut up gcc */
447 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
449 struct scsi_disk *sdkp = NULL;
451 if (disk->private_data) {
452 sdkp = scsi_disk(disk);
453 if (scsi_device_get(sdkp->device) == 0)
454 get_device(&sdkp->dev);
461 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
463 struct scsi_disk *sdkp;
465 mutex_lock(&sd_ref_mutex);
466 sdkp = __scsi_disk_get(disk);
467 mutex_unlock(&sd_ref_mutex);
471 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
473 struct scsi_disk *sdkp;
475 mutex_lock(&sd_ref_mutex);
476 sdkp = dev_get_drvdata(dev);
478 sdkp = __scsi_disk_get(sdkp->disk);
479 mutex_unlock(&sd_ref_mutex);
483 static void scsi_disk_put(struct scsi_disk *sdkp)
485 struct scsi_device *sdev = sdkp->device;
487 mutex_lock(&sd_ref_mutex);
488 put_device(&sdkp->dev);
489 scsi_device_put(sdev);
490 mutex_unlock(&sd_ref_mutex);
493 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
495 unsigned int prot_op = SCSI_PROT_NORMAL;
496 unsigned int dix = scsi_prot_sg_count(scmd);
498 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
500 prot_op = SCSI_PROT_READ_PASS;
501 else if (dif && !dix)
502 prot_op = SCSI_PROT_READ_STRIP;
503 else if (!dif && dix)
504 prot_op = SCSI_PROT_READ_INSERT;
507 prot_op = SCSI_PROT_WRITE_PASS;
508 else if (dif && !dix)
509 prot_op = SCSI_PROT_WRITE_INSERT;
510 else if (!dif && dix)
511 prot_op = SCSI_PROT_WRITE_STRIP;
514 scsi_set_prot_op(scmd, prot_op);
515 scsi_set_prot_type(scmd, dif);
518 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
520 struct request_queue *q = sdkp->disk->queue;
521 unsigned int logical_block_size = sdkp->device->sector_size;
522 unsigned int max_blocks = 0;
524 q->limits.discard_zeroes_data = sdkp->lbprz;
525 q->limits.discard_alignment = sdkp->unmap_alignment *
527 q->limits.discard_granularity =
528 max(sdkp->physical_block_size,
529 sdkp->unmap_granularity * logical_block_size);
531 sdkp->provisioning_mode = mode;
536 q->limits.max_discard_sectors = 0;
537 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
541 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
545 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
549 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
553 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
554 q->limits.discard_zeroes_data = 1;
558 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
559 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
563 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
564 * @sdp: scsi device to operate one
565 * @rq: Request to prepare
567 * Will issue either UNMAP or WRITE SAME(16) depending on preference
568 * indicated by target device.
570 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
572 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
573 struct bio *bio = rq->bio;
574 sector_t sector = bio->bi_sector;
575 unsigned int nr_sectors = bio_sectors(bio);
581 if (sdkp->device->sector_size == 4096) {
586 rq->timeout = SD_TIMEOUT;
588 memset(rq->cmd, 0, rq->cmd_len);
590 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
592 return BLKPREP_DEFER;
594 switch (sdkp->provisioning_mode) {
596 buf = page_address(page);
602 put_unaligned_be16(6 + 16, &buf[0]);
603 put_unaligned_be16(16, &buf[2]);
604 put_unaligned_be64(sector, &buf[8]);
605 put_unaligned_be32(nr_sectors, &buf[16]);
612 rq->cmd[0] = WRITE_SAME_16;
613 rq->cmd[1] = 0x8; /* UNMAP */
614 put_unaligned_be64(sector, &rq->cmd[2]);
615 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
617 len = sdkp->device->sector_size;
623 rq->cmd[0] = WRITE_SAME;
624 if (sdkp->provisioning_mode == SD_LBP_WS10)
625 rq->cmd[1] = 0x8; /* UNMAP */
626 put_unaligned_be32(sector, &rq->cmd[2]);
627 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
629 len = sdkp->device->sector_size;
637 blk_add_request_payload(rq, page, len);
638 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
639 rq->buffer = page_address(page);
642 if (ret != BLKPREP_OK) {
649 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
651 rq->timeout = SD_FLUSH_TIMEOUT;
652 rq->retries = SD_MAX_RETRIES;
653 rq->cmd[0] = SYNCHRONIZE_CACHE;
656 return scsi_setup_blk_pc_cmnd(sdp, rq);
659 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
661 if (rq->cmd_flags & REQ_DISCARD) {
662 free_page((unsigned long)rq->buffer);
668 * sd_prep_fn - build a scsi (read or write) command from
669 * information in the request structure.
670 * @SCpnt: pointer to mid-level's per scsi command structure that
671 * contains request and into which the scsi command is written
673 * Returns 1 if successful and 0 if error (or cannot be done now).
675 static int sd_prep_fn(struct request_queue *q, struct request *rq)
677 struct scsi_cmnd *SCpnt;
678 struct scsi_device *sdp = q->queuedata;
679 struct gendisk *disk = rq->rq_disk;
680 struct scsi_disk *sdkp;
681 sector_t block = blk_rq_pos(rq);
683 unsigned int this_count = blk_rq_sectors(rq);
685 unsigned char protect;
688 * Discard request come in as REQ_TYPE_FS but we turn them into
689 * block PC requests to make life easier.
691 if (rq->cmd_flags & REQ_DISCARD) {
692 ret = scsi_setup_discard_cmnd(sdp, rq);
694 } else if (rq->cmd_flags & REQ_FLUSH) {
695 ret = scsi_setup_flush_cmnd(sdp, rq);
697 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
698 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
700 } else if (rq->cmd_type != REQ_TYPE_FS) {
704 ret = scsi_setup_fs_cmnd(sdp, rq);
705 if (ret != BLKPREP_OK)
708 sdkp = scsi_disk(disk);
710 /* from here on until we're complete, any goto out
711 * is used for a killable error condition */
714 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
715 "sd_prep_fn: block=%llu, "
717 (unsigned long long)block,
720 if (!sdp || !scsi_device_online(sdp) ||
721 block + blk_rq_sectors(rq) > get_capacity(disk)) {
722 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
723 "Finishing %u sectors\n",
724 blk_rq_sectors(rq)));
725 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
726 "Retry with 0x%p\n", SCpnt));
732 * quietly refuse to do anything to a changed disc until
733 * the changed bit has been reset
735 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
740 * Some SD card readers can't handle multi-sector accesses which touch
741 * the last one or two hardware sectors. Split accesses as needed.
743 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
744 (sdp->sector_size / 512);
746 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
747 if (block < threshold) {
748 /* Access up to the threshold but not beyond */
749 this_count = threshold - block;
751 /* Access only a single hardware sector */
752 this_count = sdp->sector_size / 512;
756 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
757 (unsigned long long)block));
760 * If we have a 1K hardware sectorsize, prevent access to single
761 * 512 byte sectors. In theory we could handle this - in fact
762 * the scsi cdrom driver must be able to handle this because
763 * we typically use 1K blocksizes, and cdroms typically have
764 * 2K hardware sectorsizes. Of course, things are simpler
765 * with the cdrom, since it is read-only. For performance
766 * reasons, the filesystems should be able to handle this
767 * and not force the scsi disk driver to use bounce buffers
770 if (sdp->sector_size == 1024) {
771 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
772 scmd_printk(KERN_ERR, SCpnt,
773 "Bad block number requested\n");
777 this_count = this_count >> 1;
780 if (sdp->sector_size == 2048) {
781 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
782 scmd_printk(KERN_ERR, SCpnt,
783 "Bad block number requested\n");
787 this_count = this_count >> 2;
790 if (sdp->sector_size == 4096) {
791 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
792 scmd_printk(KERN_ERR, SCpnt,
793 "Bad block number requested\n");
797 this_count = this_count >> 3;
800 if (rq_data_dir(rq) == WRITE) {
801 if (!sdp->writeable) {
804 SCpnt->cmnd[0] = WRITE_6;
805 SCpnt->sc_data_direction = DMA_TO_DEVICE;
807 if (blk_integrity_rq(rq) &&
808 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
811 } else if (rq_data_dir(rq) == READ) {
812 SCpnt->cmnd[0] = READ_6;
813 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
815 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
819 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
820 "%s %d/%u 512 byte blocks.\n",
821 (rq_data_dir(rq) == WRITE) ?
822 "writing" : "reading", this_count,
823 blk_rq_sectors(rq)));
825 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
826 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
832 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
833 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
835 if (unlikely(SCpnt->cmnd == NULL)) {
840 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
841 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
842 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
843 SCpnt->cmnd[7] = 0x18;
844 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
845 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
848 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
849 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
850 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
851 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
852 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
853 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
854 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
855 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
857 /* Expected Indirect LBA */
858 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
859 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
860 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
861 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
863 /* Transfer length */
864 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
865 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
866 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
867 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
868 } else if (block > 0xffffffff) {
869 SCpnt->cmnd[0] += READ_16 - READ_6;
870 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
871 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
872 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
873 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
874 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
875 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
876 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
877 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
878 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
879 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
880 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
881 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
882 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
883 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
884 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
885 scsi_device_protection(SCpnt->device) ||
886 SCpnt->device->use_10_for_rw) {
887 if (this_count > 0xffff)
890 SCpnt->cmnd[0] += READ_10 - READ_6;
891 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
892 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
893 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
894 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
895 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
896 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
897 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
898 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
900 if (unlikely(rq->cmd_flags & REQ_FUA)) {
902 * This happens only if this drive failed
903 * 10byte rw command with ILLEGAL_REQUEST
904 * during operation and thus turned off
907 scmd_printk(KERN_ERR, SCpnt,
908 "FUA write on READ/WRITE(6) drive\n");
912 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
913 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
914 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
915 SCpnt->cmnd[4] = (unsigned char) this_count;
918 SCpnt->sdb.length = this_count * sdp->sector_size;
920 /* If DIF or DIX is enabled, tell HBA how to handle request */
921 if (host_dif || scsi_prot_sg_count(SCpnt))
922 sd_prot_op(SCpnt, host_dif);
925 * We shouldn't disconnect in the middle of a sector, so with a dumb
926 * host adapter, it's safe to assume that we can at least transfer
927 * this many bytes between each connect / disconnect.
929 SCpnt->transfersize = sdp->sector_size;
930 SCpnt->underflow = this_count << 9;
931 SCpnt->allowed = SD_MAX_RETRIES;
934 * This indicates that the command is ready from our end to be
939 return scsi_prep_return(q, rq, ret);
943 * sd_open - open a scsi disk device
944 * @inode: only i_rdev member may be used
945 * @filp: only f_mode and f_flags may be used
947 * Returns 0 if successful. Returns a negated errno value in case
950 * Note: This can be called from a user context (e.g. fsck(1) )
951 * or from within the kernel (e.g. as a result of a mount(1) ).
952 * In the latter case @inode and @filp carry an abridged amount
953 * of information as noted above.
955 * Locking: called with bdev->bd_mutex held.
957 static int sd_open(struct block_device *bdev, fmode_t mode)
959 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
960 struct scsi_device *sdev;
966 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
970 retval = scsi_autopm_get_device(sdev);
975 * If the device is in error recovery, wait until it is done.
976 * If the device is offline, then disallow any access to it.
979 if (!scsi_block_when_processing_errors(sdev))
982 if (sdev->removable || sdkp->write_prot)
983 check_disk_change(bdev);
986 * If the drive is empty, just let the open fail.
989 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
993 * If the device has the write protect tab set, have the open fail
994 * if the user expects to be able to write to the thing.
997 if (sdkp->write_prot && (mode & FMODE_WRITE))
1001 * It is possible that the disk changing stuff resulted in
1002 * the device being taken offline. If this is the case,
1003 * report this to the user, and don't pretend that the
1004 * open actually succeeded.
1007 if (!scsi_device_online(sdev))
1010 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1011 if (scsi_block_when_processing_errors(sdev))
1012 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1018 scsi_autopm_put_device(sdev);
1020 scsi_disk_put(sdkp);
1025 * sd_release - invoked when the (last) close(2) is called on this
1027 * @inode: only i_rdev member may be used
1028 * @filp: only f_mode and f_flags may be used
1032 * Note: may block (uninterruptible) if error recovery is underway
1035 * Locking: called with bdev->bd_mutex held.
1037 static int sd_release(struct gendisk *disk, fmode_t mode)
1039 struct scsi_disk *sdkp = scsi_disk(disk);
1040 struct scsi_device *sdev = sdkp->device;
1042 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1044 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1045 if (scsi_block_when_processing_errors(sdev))
1046 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1050 * XXX and what if there are packets in flight and this close()
1051 * XXX is followed by a "rmmod sd_mod"?
1054 scsi_autopm_put_device(sdev);
1055 scsi_disk_put(sdkp);
1059 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1061 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1062 struct scsi_device *sdp = sdkp->device;
1063 struct Scsi_Host *host = sdp->host;
1066 /* default to most commonly used values */
1067 diskinfo[0] = 0x40; /* 1 << 6 */
1068 diskinfo[1] = 0x20; /* 1 << 5 */
1069 diskinfo[2] = sdkp->capacity >> 11;
1071 /* override with calculated, extended default, or driver values */
1072 if (host->hostt->bios_param)
1073 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1075 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1077 geo->heads = diskinfo[0];
1078 geo->sectors = diskinfo[1];
1079 geo->cylinders = diskinfo[2];
1084 * sd_ioctl - process an ioctl
1085 * @inode: only i_rdev/i_bdev members may be used
1086 * @filp: only f_mode and f_flags may be used
1087 * @cmd: ioctl command number
1088 * @arg: this is third argument given to ioctl(2) system call.
1089 * Often contains a pointer.
1091 * Returns 0 if successful (some ioctls return positive numbers on
1092 * success as well). Returns a negated errno value in case of error.
1094 * Note: most ioctls are forward onto the block subsystem or further
1095 * down in the scsi subsystem.
1097 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1098 unsigned int cmd, unsigned long arg)
1100 struct gendisk *disk = bdev->bd_disk;
1101 struct scsi_disk *sdkp = scsi_disk(disk);
1102 struct scsi_device *sdp = sdkp->device;
1103 void __user *p = (void __user *)arg;
1106 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1107 "cmd=0x%x\n", disk->disk_name, cmd));
1109 error = scsi_verify_blk_ioctl(bdev, cmd);
1114 * If we are in the middle of error recovery, don't let anyone
1115 * else try and use this device. Also, if error recovery fails, it
1116 * may try and take the device offline, in which case all further
1117 * access to the device is prohibited.
1119 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1120 (mode & FMODE_NDELAY) != 0);
1121 if (!scsi_block_when_processing_errors(sdp) || !error)
1125 * Send SCSI addressing ioctls directly to mid level, send other
1126 * ioctls to block level and then onto mid level if they can't be
1130 case SCSI_IOCTL_GET_IDLUN:
1131 case SCSI_IOCTL_GET_BUS_NUMBER:
1132 error = scsi_ioctl(sdp, cmd, p);
1135 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1136 if (error != -ENOTTY)
1138 error = scsi_ioctl(sdp, cmd, p);
1145 static void set_media_not_present(struct scsi_disk *sdkp)
1147 if (sdkp->media_present)
1148 sdkp->device->changed = 1;
1150 if (sdkp->device->removable) {
1151 sdkp->media_present = 0;
1156 static int media_not_present(struct scsi_disk *sdkp,
1157 struct scsi_sense_hdr *sshdr)
1159 if (!scsi_sense_valid(sshdr))
1162 /* not invoked for commands that could return deferred errors */
1163 switch (sshdr->sense_key) {
1164 case UNIT_ATTENTION:
1166 /* medium not present */
1167 if (sshdr->asc == 0x3A) {
1168 set_media_not_present(sdkp);
1176 * sd_check_events - check media events
1177 * @disk: kernel device descriptor
1178 * @clearing: disk events currently being cleared
1180 * Returns mask of DISK_EVENT_*.
1182 * Note: this function is invoked from the block subsystem.
1184 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1186 struct scsi_disk *sdkp = scsi_disk(disk);
1187 struct scsi_device *sdp = sdkp->device;
1188 struct scsi_sense_hdr *sshdr = NULL;
1191 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1194 * If the device is offline, don't send any commands - just pretend as
1195 * if the command failed. If the device ever comes back online, we
1196 * can deal with it then. It is only because of unrecoverable errors
1197 * that we would ever take a device offline in the first place.
1199 if (!scsi_device_online(sdp)) {
1200 set_media_not_present(sdkp);
1205 * Using TEST_UNIT_READY enables differentiation between drive with
1206 * no cartridge loaded - NOT READY, drive with changed cartridge -
1207 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1209 * Drives that auto spin down. eg iomega jaz 1G, will be started
1210 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1211 * sd_revalidate() is called.
1215 if (scsi_block_when_processing_errors(sdp)) {
1216 retval = scsi_autopm_get_device(sdp);
1220 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1221 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1223 scsi_autopm_put_device(sdp);
1226 /* failed to execute TUR, assume media not present */
1227 if (host_byte(retval)) {
1228 set_media_not_present(sdkp);
1232 if (media_not_present(sdkp, sshdr))
1236 * For removable scsi disk we have to recognise the presence
1237 * of a disk in the drive.
1239 if (!sdkp->media_present)
1241 sdkp->media_present = 1;
1244 * sdp->changed is set under the following conditions:
1246 * Medium present state has changed in either direction.
1247 * Device has indicated UNIT_ATTENTION.
1250 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1255 static int sd_sync_cache(struct scsi_disk *sdkp)
1258 struct scsi_device *sdp = sdkp->device;
1259 struct scsi_sense_hdr sshdr;
1261 if (!scsi_device_online(sdp))
1265 for (retries = 3; retries > 0; --retries) {
1266 unsigned char cmd[10] = { 0 };
1268 cmd[0] = SYNCHRONIZE_CACHE;
1270 * Leave the rest of the command zero to indicate
1273 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1274 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1280 sd_print_result(sdkp, res);
1281 if (driver_byte(res) & DRIVER_SENSE)
1282 sd_print_sense_hdr(sdkp, &sshdr);
1290 static void sd_rescan(struct device *dev)
1292 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1295 revalidate_disk(sdkp->disk);
1296 scsi_disk_put(sdkp);
1301 #ifdef CONFIG_COMPAT
1303 * This gets directly called from VFS. When the ioctl
1304 * is not recognized we go back to the other translation paths.
1306 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1307 unsigned int cmd, unsigned long arg)
1309 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1312 ret = scsi_verify_blk_ioctl(bdev, cmd);
1317 * If we are in the middle of error recovery, don't let anyone
1318 * else try and use this device. Also, if error recovery fails, it
1319 * may try and take the device offline, in which case all further
1320 * access to the device is prohibited.
1322 if (!scsi_block_when_processing_errors(sdev))
1325 if (sdev->host->hostt->compat_ioctl) {
1326 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1332 * Let the static ioctl translation table take care of it.
1334 return -ENOIOCTLCMD;
1338 static const struct block_device_operations sd_fops = {
1339 .owner = THIS_MODULE,
1341 .release = sd_release,
1343 .getgeo = sd_getgeo,
1344 #ifdef CONFIG_COMPAT
1345 .compat_ioctl = sd_compat_ioctl,
1347 .check_events = sd_check_events,
1348 .revalidate_disk = sd_revalidate_disk,
1349 .unlock_native_capacity = sd_unlock_native_capacity,
1353 * sd_eh_action - error handling callback
1354 * @scmd: sd-issued command that has failed
1355 * @eh_cmnd: The command that was sent during error handling
1356 * @eh_cmnd_len: Length of eh_cmnd in bytes
1357 * @eh_disp: The recovery disposition suggested by the midlayer
1359 * This function is called by the SCSI midlayer upon completion of
1360 * an error handling command (TEST UNIT READY, START STOP UNIT,
1361 * etc.) The command sent to the device by the error handler is
1362 * stored in eh_cmnd. The result of sending the eh command is
1363 * passed in eh_disp.
1365 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1366 int eh_cmnd_len, int eh_disp)
1368 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1370 if (!scsi_device_online(scmd->device) ||
1371 !scsi_medium_access_command(scmd))
1375 * The device has timed out executing a medium access command.
1376 * However, the TEST UNIT READY command sent during error
1377 * handling completed successfully. Either the device is in the
1378 * process of recovering or has it suffered an internal failure
1379 * that prevents access to the storage medium.
1381 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1382 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1383 sdkp->medium_access_timed_out++;
1386 * If the device keeps failing read/write commands but TEST UNIT
1387 * READY always completes successfully we assume that medium
1388 * access is no longer possible and take the device offline.
1390 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1391 scmd_printk(KERN_ERR, scmd,
1392 "Medium access timeout failure. Offlining disk!\n");
1393 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1401 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1403 u64 start_lba = blk_rq_pos(scmd->request);
1404 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1408 * resid is optional but mostly filled in. When it's unused,
1409 * its value is zero, so we assume the whole buffer transferred
1411 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1412 unsigned int good_bytes;
1414 if (scmd->request->cmd_type != REQ_TYPE_FS)
1417 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1418 SCSI_SENSE_BUFFERSIZE,
1423 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1426 if (scmd->device->sector_size < 512) {
1427 /* only legitimate sector_size here is 256 */
1431 /* be careful ... don't want any overflows */
1432 u64 factor = scmd->device->sector_size / 512;
1433 do_div(start_lba, factor);
1434 do_div(end_lba, factor);
1437 /* The bad lba was reported incorrectly, we have no idea where
1440 if (bad_lba < start_lba || bad_lba >= end_lba)
1443 /* This computation should always be done in terms of
1444 * the resolution of the device's medium.
1446 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1447 return min(good_bytes, transferred);
1451 * sd_done - bottom half handler: called when the lower level
1452 * driver has completed (successfully or otherwise) a scsi command.
1453 * @SCpnt: mid-level's per command structure.
1455 * Note: potentially run from within an ISR. Must not block.
1457 static int sd_done(struct scsi_cmnd *SCpnt)
1459 int result = SCpnt->result;
1460 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1461 struct scsi_sense_hdr sshdr;
1462 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1463 int sense_valid = 0;
1464 int sense_deferred = 0;
1465 unsigned char op = SCpnt->cmnd[0];
1467 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1468 scsi_set_resid(SCpnt, 0);
1471 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1473 sense_deferred = scsi_sense_is_deferred(&sshdr);
1475 #ifdef CONFIG_SCSI_LOGGING
1476 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1478 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1479 "sd_done: sb[respc,sk,asc,"
1480 "ascq]=%x,%x,%x,%x\n",
1481 sshdr.response_code,
1482 sshdr.sense_key, sshdr.asc,
1486 if (driver_byte(result) != DRIVER_SENSE &&
1487 (!sense_valid || sense_deferred))
1490 sdkp->medium_access_timed_out = 0;
1492 switch (sshdr.sense_key) {
1493 case HARDWARE_ERROR:
1495 good_bytes = sd_completed_bytes(SCpnt);
1497 case RECOVERED_ERROR:
1498 good_bytes = scsi_bufflen(SCpnt);
1501 /* This indicates a false check condition, so ignore it. An
1502 * unknown amount of data was transferred so treat it as an
1505 scsi_print_sense("sd", SCpnt);
1507 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1509 case ABORTED_COMMAND:
1510 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1511 good_bytes = sd_completed_bytes(SCpnt);
1513 case ILLEGAL_REQUEST:
1514 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1515 good_bytes = sd_completed_bytes(SCpnt);
1516 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1517 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1518 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1519 sd_config_discard(sdkp, SD_LBP_DISABLE);
1525 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1526 sd_dif_complete(SCpnt, good_bytes);
1528 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1529 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1531 /* We have to print a failed command here as the
1532 * extended CDB gets freed before scsi_io_completion()
1536 scsi_print_command(SCpnt);
1538 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1547 * spinup disk - called only in sd_revalidate_disk()
1550 sd_spinup_disk(struct scsi_disk *sdkp)
1552 unsigned char cmd[10];
1553 unsigned long spintime_expire = 0;
1554 int retries, spintime;
1555 unsigned int the_result;
1556 struct scsi_sense_hdr sshdr;
1557 int sense_valid = 0;
1561 /* Spin up drives, as required. Only do this at boot time */
1562 /* Spinup needs to be done for module loads too. */
1567 cmd[0] = TEST_UNIT_READY;
1568 memset((void *) &cmd[1], 0, 9);
1570 the_result = scsi_execute_req(sdkp->device, cmd,
1573 SD_MAX_RETRIES, NULL);
1576 * If the drive has indicated to us that it
1577 * doesn't have any media in it, don't bother
1578 * with any more polling.
1580 if (media_not_present(sdkp, &sshdr))
1584 sense_valid = scsi_sense_valid(&sshdr);
1586 } while (retries < 3 &&
1587 (!scsi_status_is_good(the_result) ||
1588 ((driver_byte(the_result) & DRIVER_SENSE) &&
1589 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1591 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1592 /* no sense, TUR either succeeded or failed
1593 * with a status error */
1594 if(!spintime && !scsi_status_is_good(the_result)) {
1595 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1596 sd_print_result(sdkp, the_result);
1602 * The device does not want the automatic start to be issued.
1604 if (sdkp->device->no_start_on_add)
1607 if (sense_valid && sshdr.sense_key == NOT_READY) {
1608 if (sshdr.asc == 4 && sshdr.ascq == 3)
1609 break; /* manual intervention required */
1610 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1611 break; /* standby */
1612 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1613 break; /* unavailable */
1615 * Issue command to spin up drive when not ready
1618 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1619 cmd[0] = START_STOP;
1620 cmd[1] = 1; /* Return immediately */
1621 memset((void *) &cmd[2], 0, 8);
1622 cmd[4] = 1; /* Start spin cycle */
1623 if (sdkp->device->start_stop_pwr_cond)
1625 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1627 SD_TIMEOUT, SD_MAX_RETRIES,
1629 spintime_expire = jiffies + 100 * HZ;
1632 /* Wait 1 second for next try */
1637 * Wait for USB flash devices with slow firmware.
1638 * Yes, this sense key/ASC combination shouldn't
1639 * occur here. It's characteristic of these devices.
1641 } else if (sense_valid &&
1642 sshdr.sense_key == UNIT_ATTENTION &&
1643 sshdr.asc == 0x28) {
1645 spintime_expire = jiffies + 5 * HZ;
1648 /* Wait 1 second for next try */
1651 /* we don't understand the sense code, so it's
1652 * probably pointless to loop */
1654 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1655 sd_print_sense_hdr(sdkp, &sshdr);
1660 } while (spintime && time_before_eq(jiffies, spintime_expire));
1663 if (scsi_status_is_good(the_result))
1666 printk("not responding...\n");
1672 * Determine whether disk supports Data Integrity Field.
1674 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1676 struct scsi_device *sdp = sdkp->device;
1679 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1682 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1684 if (type == sdkp->protection_type || !sdkp->first_scan)
1687 sdkp->protection_type = type;
1689 if (type > SD_DIF_TYPE3_PROTECTION) {
1690 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1691 "protection type %u. Disabling disk!\n", type);
1696 if (scsi_host_dif_capable(sdp->host, type))
1697 sd_printk(KERN_NOTICE, sdkp,
1698 "Enabling DIF Type %u protection\n", type);
1700 sd_printk(KERN_NOTICE, sdkp,
1701 "Disabling DIF Type %u protection\n", type);
1704 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1705 struct scsi_sense_hdr *sshdr, int sense_valid,
1708 sd_print_result(sdkp, the_result);
1709 if (driver_byte(the_result) & DRIVER_SENSE)
1710 sd_print_sense_hdr(sdkp, sshdr);
1712 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1715 * Set dirty bit for removable devices if not ready -
1716 * sometimes drives will not report this properly.
1718 if (sdp->removable &&
1719 sense_valid && sshdr->sense_key == NOT_READY)
1720 set_media_not_present(sdkp);
1723 * We used to set media_present to 0 here to indicate no media
1724 * in the drive, but some drives fail read capacity even with
1725 * media present, so we can't do that.
1727 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1731 #if RC16_LEN > SD_BUF_SIZE
1732 #error RC16_LEN must not be more than SD_BUF_SIZE
1735 #define READ_CAPACITY_RETRIES_ON_RESET 10
1737 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1738 unsigned char *buffer)
1740 unsigned char cmd[16];
1741 struct scsi_sense_hdr sshdr;
1742 int sense_valid = 0;
1744 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1745 unsigned int alignment;
1746 unsigned long long lba;
1747 unsigned sector_size;
1749 if (sdp->no_read_capacity_16)
1754 cmd[0] = SERVICE_ACTION_IN;
1755 cmd[1] = SAI_READ_CAPACITY_16;
1757 memset(buffer, 0, RC16_LEN);
1759 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1760 buffer, RC16_LEN, &sshdr,
1761 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1763 if (media_not_present(sdkp, &sshdr))
1767 sense_valid = scsi_sense_valid(&sshdr);
1769 sshdr.sense_key == ILLEGAL_REQUEST &&
1770 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1772 /* Invalid Command Operation Code or
1773 * Invalid Field in CDB, just retry
1774 * silently with RC10 */
1777 sshdr.sense_key == UNIT_ATTENTION &&
1778 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1779 /* Device reset might occur several times,
1780 * give it one more chance */
1781 if (--reset_retries > 0)
1786 } while (the_result && retries);
1789 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1790 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1794 sector_size = get_unaligned_be32(&buffer[8]);
1795 lba = get_unaligned_be64(&buffer[0]);
1797 sd_read_protection_type(sdkp, buffer);
1799 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1800 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1801 "kernel compiled with support for large block "
1807 /* Logical blocks per physical block exponent */
1808 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1810 /* Lowest aligned logical block */
1811 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1812 blk_queue_alignment_offset(sdp->request_queue, alignment);
1813 if (alignment && sdkp->first_scan)
1814 sd_printk(KERN_NOTICE, sdkp,
1815 "physical block alignment offset: %u\n", alignment);
1817 if (buffer[14] & 0x80) { /* LBPME */
1820 if (buffer[14] & 0x40) /* LBPRZ */
1823 sd_config_discard(sdkp, SD_LBP_WS16);
1826 sdkp->capacity = lba + 1;
1830 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1831 unsigned char *buffer)
1833 unsigned char cmd[16];
1834 struct scsi_sense_hdr sshdr;
1835 int sense_valid = 0;
1837 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1839 unsigned sector_size;
1842 cmd[0] = READ_CAPACITY;
1843 memset(&cmd[1], 0, 9);
1844 memset(buffer, 0, 8);
1846 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1848 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1850 if (media_not_present(sdkp, &sshdr))
1854 sense_valid = scsi_sense_valid(&sshdr);
1856 sshdr.sense_key == UNIT_ATTENTION &&
1857 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1858 /* Device reset might occur several times,
1859 * give it one more chance */
1860 if (--reset_retries > 0)
1865 } while (the_result && retries);
1868 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1869 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1873 sector_size = get_unaligned_be32(&buffer[4]);
1874 lba = get_unaligned_be32(&buffer[0]);
1876 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1877 /* Some buggy (usb cardreader) devices return an lba of
1878 0xffffffff when the want to report a size of 0 (with
1879 which they really mean no media is present) */
1881 sdkp->physical_block_size = sector_size;
1885 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1886 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1887 "kernel compiled with support for large block "
1893 sdkp->capacity = lba + 1;
1894 sdkp->physical_block_size = sector_size;
1898 static int sd_try_rc16_first(struct scsi_device *sdp)
1900 if (sdp->host->max_cmd_len < 16)
1902 if (sdp->try_rc_10_first)
1904 if (sdp->scsi_level > SCSI_SPC_2)
1906 if (scsi_device_protection(sdp))
1912 * read disk capacity
1915 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1918 struct scsi_device *sdp = sdkp->device;
1919 sector_t old_capacity = sdkp->capacity;
1921 if (sd_try_rc16_first(sdp)) {
1922 sector_size = read_capacity_16(sdkp, sdp, buffer);
1923 if (sector_size == -EOVERFLOW)
1925 if (sector_size == -ENODEV)
1927 if (sector_size < 0)
1928 sector_size = read_capacity_10(sdkp, sdp, buffer);
1929 if (sector_size < 0)
1932 sector_size = read_capacity_10(sdkp, sdp, buffer);
1933 if (sector_size == -EOVERFLOW)
1935 if (sector_size < 0)
1937 if ((sizeof(sdkp->capacity) > 4) &&
1938 (sdkp->capacity > 0xffffffffULL)) {
1939 int old_sector_size = sector_size;
1940 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1941 "Trying to use READ CAPACITY(16).\n");
1942 sector_size = read_capacity_16(sdkp, sdp, buffer);
1943 if (sector_size < 0) {
1944 sd_printk(KERN_NOTICE, sdkp,
1945 "Using 0xffffffff as device size\n");
1946 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1947 sector_size = old_sector_size;
1953 /* Some devices are known to return the total number of blocks,
1954 * not the highest block number. Some devices have versions
1955 * which do this and others which do not. Some devices we might
1956 * suspect of doing this but we don't know for certain.
1958 * If we know the reported capacity is wrong, decrement it. If
1959 * we can only guess, then assume the number of blocks is even
1960 * (usually true but not always) and err on the side of lowering
1963 if (sdp->fix_capacity ||
1964 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1965 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1966 "from its reported value: %llu\n",
1967 (unsigned long long) sdkp->capacity);
1972 if (sector_size == 0) {
1974 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1978 if (sector_size != 512 &&
1979 sector_size != 1024 &&
1980 sector_size != 2048 &&
1981 sector_size != 4096 &&
1982 sector_size != 256) {
1983 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1986 * The user might want to re-format the drive with
1987 * a supported sectorsize. Once this happens, it
1988 * would be relatively trivial to set the thing up.
1989 * For this reason, we leave the thing in the table.
1993 * set a bogus sector size so the normal read/write
1994 * logic in the block layer will eventually refuse any
1995 * request on this device without tripping over power
1996 * of two sector size assumptions
2000 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2003 char cap_str_2[10], cap_str_10[10];
2004 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2006 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2008 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2009 sizeof(cap_str_10));
2011 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2012 sd_printk(KERN_NOTICE, sdkp,
2013 "%llu %d-byte logical blocks: (%s/%s)\n",
2014 (unsigned long long)sdkp->capacity,
2015 sector_size, cap_str_10, cap_str_2);
2017 if (sdkp->physical_block_size != sector_size)
2018 sd_printk(KERN_NOTICE, sdkp,
2019 "%u-byte physical blocks\n",
2020 sdkp->physical_block_size);
2024 /* Rescale capacity to 512-byte units */
2025 if (sector_size == 4096)
2026 sdkp->capacity <<= 3;
2027 else if (sector_size == 2048)
2028 sdkp->capacity <<= 2;
2029 else if (sector_size == 1024)
2030 sdkp->capacity <<= 1;
2031 else if (sector_size == 256)
2032 sdkp->capacity >>= 1;
2034 blk_queue_physical_block_size(sdp->request_queue,
2035 sdkp->physical_block_size);
2036 sdkp->device->sector_size = sector_size;
2039 /* called with buffer of length 512 */
2041 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2042 unsigned char *buffer, int len, struct scsi_mode_data *data,
2043 struct scsi_sense_hdr *sshdr)
2045 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2046 SD_TIMEOUT, SD_MAX_RETRIES, data,
2051 * read write protect setting, if possible - called only in sd_revalidate_disk()
2052 * called with buffer of length SD_BUF_SIZE
2055 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2058 struct scsi_device *sdp = sdkp->device;
2059 struct scsi_mode_data data;
2060 int old_wp = sdkp->write_prot;
2062 set_disk_ro(sdkp->disk, 0);
2063 if (sdp->skip_ms_page_3f) {
2064 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2068 if (sdp->use_192_bytes_for_3f) {
2069 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2072 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2073 * We have to start carefully: some devices hang if we ask
2074 * for more than is available.
2076 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2079 * Second attempt: ask for page 0 When only page 0 is
2080 * implemented, a request for page 3F may return Sense Key
2081 * 5: Illegal Request, Sense Code 24: Invalid field in
2084 if (!scsi_status_is_good(res))
2085 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2088 * Third attempt: ask 255 bytes, as we did earlier.
2090 if (!scsi_status_is_good(res))
2091 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2095 if (!scsi_status_is_good(res)) {
2096 sd_printk(KERN_WARNING, sdkp,
2097 "Test WP failed, assume Write Enabled\n");
2099 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2100 set_disk_ro(sdkp->disk, sdkp->write_prot);
2101 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2102 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2103 sdkp->write_prot ? "on" : "off");
2104 sd_printk(KERN_DEBUG, sdkp,
2105 "Mode Sense: %02x %02x %02x %02x\n",
2106 buffer[0], buffer[1], buffer[2], buffer[3]);
2112 * sd_read_cache_type - called only from sd_revalidate_disk()
2113 * called with buffer of length SD_BUF_SIZE
2116 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2119 struct scsi_device *sdp = sdkp->device;
2124 struct scsi_mode_data data;
2125 struct scsi_sense_hdr sshdr;
2126 int old_wce = sdkp->WCE;
2127 int old_rcd = sdkp->RCD;
2128 int old_dpofua = sdkp->DPOFUA;
2131 if (sdp->skip_ms_page_8) {
2132 if (sdp->type == TYPE_RBC)
2135 if (sdp->skip_ms_page_3f)
2138 if (sdp->use_192_bytes_for_3f)
2142 } else if (sdp->type == TYPE_RBC) {
2150 /* cautiously ask */
2151 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2154 if (!scsi_status_is_good(res))
2157 if (!data.header_length) {
2160 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2163 /* that went OK, now ask for the proper length */
2167 * We're only interested in the first three bytes, actually.
2168 * But the data cache page is defined for the first 20.
2172 else if (len > SD_BUF_SIZE) {
2173 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2174 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2177 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2181 if (len > first_len)
2182 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2185 if (scsi_status_is_good(res)) {
2186 int offset = data.header_length + data.block_descriptor_length;
2188 while (offset < len) {
2189 u8 page_code = buffer[offset] & 0x3F;
2190 u8 spf = buffer[offset] & 0x40;
2192 if (page_code == 8 || page_code == 6) {
2193 /* We're interested only in the first 3 bytes.
2195 if (len - offset <= 2) {
2196 sd_printk(KERN_ERR, sdkp, "Incomplete "
2197 "mode parameter data\n");
2200 modepage = page_code;
2204 /* Go to the next page */
2205 if (spf && len - offset > 3)
2206 offset += 4 + (buffer[offset+2] << 8) +
2208 else if (!spf && len - offset > 1)
2209 offset += 2 + buffer[offset+1];
2211 sd_printk(KERN_ERR, sdkp, "Incomplete "
2212 "mode parameter data\n");
2218 if (modepage == 0x3F) {
2219 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2222 } else if ((buffer[offset] & 0x3f) != modepage) {
2223 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2227 if (modepage == 8) {
2228 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2229 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2231 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2235 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2236 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2237 sd_printk(KERN_NOTICE, sdkp,
2238 "Uses READ/WRITE(6), disabling FUA\n");
2242 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2243 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2244 sd_printk(KERN_NOTICE, sdkp,
2245 "Write cache: %s, read cache: %s, %s\n",
2246 sdkp->WCE ? "enabled" : "disabled",
2247 sdkp->RCD ? "disabled" : "enabled",
2248 sdkp->DPOFUA ? "supports DPO and FUA"
2249 : "doesn't support DPO or FUA");
2255 if (scsi_sense_valid(&sshdr) &&
2256 sshdr.sense_key == ILLEGAL_REQUEST &&
2257 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2258 /* Invalid field in CDB */
2259 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2261 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2264 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2271 * The ATO bit indicates whether the DIF application tag is available
2272 * for use by the operating system.
2274 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2277 struct scsi_device *sdp = sdkp->device;
2278 struct scsi_mode_data data;
2279 struct scsi_sense_hdr sshdr;
2281 if (sdp->type != TYPE_DISK)
2284 if (sdkp->protection_type == 0)
2287 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2288 SD_MAX_RETRIES, &data, &sshdr);
2290 if (!scsi_status_is_good(res) || !data.header_length ||
2292 sd_printk(KERN_WARNING, sdkp,
2293 "getting Control mode page failed, assume no ATO\n");
2295 if (scsi_sense_valid(&sshdr))
2296 sd_print_sense_hdr(sdkp, &sshdr);
2301 offset = data.header_length + data.block_descriptor_length;
2303 if ((buffer[offset] & 0x3f) != 0x0a) {
2304 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2308 if ((buffer[offset + 5] & 0x80) == 0)
2317 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2318 * @disk: disk to query
2320 static void sd_read_block_limits(struct scsi_disk *sdkp)
2322 unsigned int sector_sz = sdkp->device->sector_size;
2323 const int vpd_len = 64;
2324 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2327 /* Block Limits VPD */
2328 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2331 blk_queue_io_min(sdkp->disk->queue,
2332 get_unaligned_be16(&buffer[6]) * sector_sz);
2333 blk_queue_io_opt(sdkp->disk->queue,
2334 get_unaligned_be32(&buffer[12]) * sector_sz);
2336 if (buffer[3] == 0x3c) {
2337 unsigned int lba_count, desc_count;
2339 sdkp->max_ws_blocks =
2340 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2346 lba_count = get_unaligned_be32(&buffer[20]);
2347 desc_count = get_unaligned_be32(&buffer[24]);
2349 if (lba_count && desc_count)
2350 sdkp->max_unmap_blocks = lba_count;
2352 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2354 if (buffer[32] & 0x80)
2355 sdkp->unmap_alignment =
2356 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2358 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2360 if (sdkp->max_unmap_blocks)
2361 sd_config_discard(sdkp, SD_LBP_UNMAP);
2363 sd_config_discard(sdkp, SD_LBP_WS16);
2365 } else { /* LBP VPD page tells us what to use */
2367 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2368 sd_config_discard(sdkp, SD_LBP_UNMAP);
2369 else if (sdkp->lbpws)
2370 sd_config_discard(sdkp, SD_LBP_WS16);
2371 else if (sdkp->lbpws10)
2372 sd_config_discard(sdkp, SD_LBP_WS10);
2374 sd_config_discard(sdkp, SD_LBP_DISABLE);
2383 * sd_read_block_characteristics - Query block dev. characteristics
2384 * @disk: disk to query
2386 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2388 unsigned char *buffer;
2390 const int vpd_len = 64;
2392 buffer = kmalloc(vpd_len, GFP_KERNEL);
2395 /* Block Device Characteristics VPD */
2396 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2399 rot = get_unaligned_be16(&buffer[4]);
2402 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2409 * sd_read_block_provisioning - Query provisioning VPD page
2410 * @disk: disk to query
2412 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2414 unsigned char *buffer;
2415 const int vpd_len = 8;
2417 if (sdkp->lbpme == 0)
2420 buffer = kmalloc(vpd_len, GFP_KERNEL);
2422 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2426 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2427 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2428 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2434 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2437 * Although VPD inquiries can go to SCSI-2 type devices,
2438 * some USB ones crash on receiving them, and the pages
2439 * we currently ask for are for SPC-3 and beyond
2441 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2447 * sd_revalidate_disk - called the first time a new disk is seen,
2448 * performs disk spin up, read_capacity, etc.
2449 * @disk: struct gendisk we care about
2451 static int sd_revalidate_disk(struct gendisk *disk)
2453 struct scsi_disk *sdkp = scsi_disk(disk);
2454 struct scsi_device *sdp = sdkp->device;
2455 unsigned char *buffer;
2458 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2459 "sd_revalidate_disk\n"));
2462 * If the device is offline, don't try and read capacity or any
2463 * of the other niceties.
2465 if (!scsi_device_online(sdp))
2468 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2470 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2471 "allocation failure.\n");
2475 sd_spinup_disk(sdkp);
2478 * Without media there is no reason to ask; moreover, some devices
2479 * react badly if we do.
2481 if (sdkp->media_present) {
2482 sd_read_capacity(sdkp, buffer);
2484 if (sd_try_extended_inquiry(sdp)) {
2485 sd_read_block_provisioning(sdkp);
2486 sd_read_block_limits(sdkp);
2487 sd_read_block_characteristics(sdkp);
2490 sd_read_write_protect_flag(sdkp, buffer);
2491 sd_read_cache_type(sdkp, buffer);
2492 sd_read_app_tag_own(sdkp, buffer);
2495 sdkp->first_scan = 0;
2498 * We now have all cache related info, determine how we deal
2499 * with flush requests.
2507 blk_queue_flush(sdkp->disk->queue, flush);
2509 set_capacity(disk, sdkp->capacity);
2517 * sd_unlock_native_capacity - unlock native capacity
2518 * @disk: struct gendisk to set capacity for
2520 * Block layer calls this function if it detects that partitions
2521 * on @disk reach beyond the end of the device. If the SCSI host
2522 * implements ->unlock_native_capacity() method, it's invoked to
2523 * give it a chance to adjust the device capacity.
2526 * Defined by block layer. Might sleep.
2528 static void sd_unlock_native_capacity(struct gendisk *disk)
2530 struct scsi_device *sdev = scsi_disk(disk)->device;
2532 if (sdev->host->hostt->unlock_native_capacity)
2533 sdev->host->hostt->unlock_native_capacity(sdev);
2537 * sd_format_disk_name - format disk name
2538 * @prefix: name prefix - ie. "sd" for SCSI disks
2539 * @index: index of the disk to format name for
2540 * @buf: output buffer
2541 * @buflen: length of the output buffer
2543 * SCSI disk names starts at sda. The 26th device is sdz and the
2544 * 27th is sdaa. The last one for two lettered suffix is sdzz
2545 * which is followed by sdaaa.
2547 * This is basically 26 base counting with one extra 'nil' entry
2548 * at the beginning from the second digit on and can be
2549 * determined using similar method as 26 base conversion with the
2550 * index shifted -1 after each digit is computed.
2556 * 0 on success, -errno on failure.
2558 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2560 const int base = 'z' - 'a' + 1;
2561 char *begin = buf + strlen(prefix);
2562 char *end = buf + buflen;
2572 *--p = 'a' + (index % unit);
2573 index = (index / unit) - 1;
2574 } while (index >= 0);
2576 memmove(begin, p, end - p);
2577 memcpy(buf, prefix, strlen(prefix));
2583 * The asynchronous part of sd_probe
2585 static void sd_probe_async(void *data, async_cookie_t cookie)
2587 struct scsi_disk *sdkp = data;
2588 struct scsi_device *sdp;
2595 index = sdkp->index;
2596 dev = &sdp->sdev_gendev;
2598 gd->major = sd_major((index & 0xf0) >> 4);
2599 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2600 gd->minors = SD_MINORS;
2602 gd->fops = &sd_fops;
2603 gd->private_data = &sdkp->driver;
2604 gd->queue = sdkp->device->request_queue;
2606 /* defaults, until the device tells us otherwise */
2607 sdp->sector_size = 512;
2609 sdkp->media_present = 1;
2610 sdkp->write_prot = 0;
2614 sdkp->first_scan = 1;
2615 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2617 sd_revalidate_disk(gd);
2619 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2620 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2622 gd->driverfs_dev = &sdp->sdev_gendev;
2623 gd->flags = GENHD_FL_EXT_DEVT;
2624 if (sdp->removable) {
2625 gd->flags |= GENHD_FL_REMOVABLE;
2626 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2630 sd_dif_config_host(sdkp);
2632 sd_revalidate_disk(gd);
2634 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2635 sdp->removable ? "removable " : "");
2636 scsi_autopm_put_device(sdp);
2637 put_device(&sdkp->dev);
2641 * sd_probe - called during driver initialization and whenever a
2642 * new scsi device is attached to the system. It is called once
2643 * for each scsi device (not just disks) present.
2644 * @dev: pointer to device object
2646 * Returns 0 if successful (or not interested in this scsi device
2647 * (e.g. scanner)); 1 when there is an error.
2649 * Note: this function is invoked from the scsi mid-level.
2650 * This function sets up the mapping between a given
2651 * <host,channel,id,lun> (found in sdp) and new device name
2652 * (e.g. /dev/sda). More precisely it is the block device major
2653 * and minor number that is chosen here.
2655 * Assume sd_probe is not re-entrant (for time being)
2656 * Also think about sd_probe() and sd_remove() running coincidentally.
2658 static int sd_probe(struct device *dev)
2660 struct scsi_device *sdp = to_scsi_device(dev);
2661 struct scsi_disk *sdkp;
2667 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2670 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2674 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2678 gd = alloc_disk(SD_MINORS);
2683 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2686 spin_lock(&sd_index_lock);
2687 error = ida_get_new(&sd_index_ida, &index);
2688 spin_unlock(&sd_index_lock);
2689 } while (error == -EAGAIN);
2692 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2696 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2698 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2699 goto out_free_index;
2703 sdkp->driver = &sd_template;
2705 sdkp->index = index;
2706 atomic_set(&sdkp->openers, 0);
2707 atomic_set(&sdkp->device->ioerr_cnt, 0);
2709 if (!sdp->request_queue->rq_timeout) {
2710 if (sdp->type != TYPE_MOD)
2711 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2713 blk_queue_rq_timeout(sdp->request_queue,
2717 device_initialize(&sdkp->dev);
2718 sdkp->dev.parent = dev;
2719 sdkp->dev.class = &sd_disk_class;
2720 dev_set_name(&sdkp->dev, dev_name(dev));
2722 if (device_add(&sdkp->dev))
2723 goto out_free_index;
2726 dev_set_drvdata(dev, sdkp);
2728 get_device(&sdkp->dev); /* prevent release before async_schedule */
2729 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2734 spin_lock(&sd_index_lock);
2735 ida_remove(&sd_index_ida, index);
2736 spin_unlock(&sd_index_lock);
2746 * sd_remove - called whenever a scsi disk (previously recognized by
2747 * sd_probe) is detached from the system. It is called (potentially
2748 * multiple times) during sd module unload.
2749 * @sdp: pointer to mid level scsi device object
2751 * Note: this function is invoked from the scsi mid-level.
2752 * This function potentially frees up a device name (e.g. /dev/sdc)
2753 * that could be re-used by a subsequent sd_probe().
2754 * This function is not called when the built-in sd driver is "exit-ed".
2756 static int sd_remove(struct device *dev)
2758 struct scsi_disk *sdkp;
2760 sdkp = dev_get_drvdata(dev);
2761 scsi_autopm_get_device(sdkp->device);
2763 async_synchronize_full_domain(&scsi_sd_probe_domain);
2764 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2765 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2766 device_del(&sdkp->dev);
2767 del_gendisk(sdkp->disk);
2770 mutex_lock(&sd_ref_mutex);
2771 dev_set_drvdata(dev, NULL);
2772 put_device(&sdkp->dev);
2773 mutex_unlock(&sd_ref_mutex);
2779 * scsi_disk_release - Called to free the scsi_disk structure
2780 * @dev: pointer to embedded class device
2782 * sd_ref_mutex must be held entering this routine. Because it is
2783 * called on last put, you should always use the scsi_disk_get()
2784 * scsi_disk_put() helpers which manipulate the semaphore directly
2785 * and never do a direct put_device.
2787 static void scsi_disk_release(struct device *dev)
2789 struct scsi_disk *sdkp = to_scsi_disk(dev);
2790 struct gendisk *disk = sdkp->disk;
2792 spin_lock(&sd_index_lock);
2793 ida_remove(&sd_index_ida, sdkp->index);
2794 spin_unlock(&sd_index_lock);
2796 disk->private_data = NULL;
2798 put_device(&sdkp->device->sdev_gendev);
2803 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2805 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2806 struct scsi_sense_hdr sshdr;
2807 struct scsi_device *sdp = sdkp->device;
2811 cmd[4] |= 1; /* START */
2813 if (sdp->start_stop_pwr_cond)
2814 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2816 if (!scsi_device_online(sdp))
2819 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2820 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2822 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2823 sd_print_result(sdkp, res);
2824 if (driver_byte(res) & DRIVER_SENSE)
2825 sd_print_sense_hdr(sdkp, &sshdr);
2832 * Send a SYNCHRONIZE CACHE instruction down to the device through
2833 * the normal SCSI command structure. Wait for the command to
2836 static void sd_shutdown(struct device *dev)
2838 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2841 return; /* this can happen */
2843 if (pm_runtime_suspended(dev))
2847 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2848 sd_sync_cache(sdkp);
2851 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2852 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2853 sd_start_stop_device(sdkp, 0);
2857 scsi_disk_put(sdkp);
2860 static int sd_suspend(struct device *dev, pm_message_t mesg)
2862 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2866 return 0; /* this can happen */
2869 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2870 ret = sd_sync_cache(sdkp);
2875 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2876 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2877 ret = sd_start_stop_device(sdkp, 0);
2881 scsi_disk_put(sdkp);
2885 static int sd_resume(struct device *dev)
2887 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2890 if (!sdkp->device->manage_start_stop)
2893 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2894 ret = sd_start_stop_device(sdkp, 1);
2897 scsi_disk_put(sdkp);
2902 * init_sd - entry point for this driver (both when built in or when
2905 * Note: this function registers this driver with the scsi mid-level.
2907 static int __init init_sd(void)
2909 int majors = 0, i, err;
2911 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2913 for (i = 0; i < SD_MAJORS; i++)
2914 if (register_blkdev(sd_major(i), "sd") == 0)
2920 err = class_register(&sd_disk_class);
2924 err = scsi_register_driver(&sd_template.gendrv);
2928 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2930 if (!sd_cdb_cache) {
2931 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2935 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2937 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2944 kmem_cache_destroy(sd_cdb_cache);
2947 class_unregister(&sd_disk_class);
2949 for (i = 0; i < SD_MAJORS; i++)
2950 unregister_blkdev(sd_major(i), "sd");
2955 * exit_sd - exit point for this driver (when it is a module).
2957 * Note: this function unregisters this driver from the scsi mid-level.
2959 static void __exit exit_sd(void)
2963 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2965 mempool_destroy(sd_cdb_pool);
2966 kmem_cache_destroy(sd_cdb_cache);
2968 scsi_unregister_driver(&sd_template.gendrv);
2969 class_unregister(&sd_disk_class);
2971 for (i = 0; i < SD_MAJORS; i++)
2972 unregister_blkdev(sd_major(i), "sd");
2975 module_init(init_sd);
2976 module_exit(exit_sd);
2978 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2979 struct scsi_sense_hdr *sshdr)
2981 sd_printk(KERN_INFO, sdkp, " ");
2982 scsi_show_sense_hdr(sshdr);
2983 sd_printk(KERN_INFO, sdkp, " ");
2984 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2987 static void sd_print_result(struct scsi_disk *sdkp, int result)
2989 sd_printk(KERN_INFO, sdkp, " ");
2990 scsi_show_result(result);