2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 * Modification history:
9 * - Drew Eckhardt <drew@colorado.edu> original
10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11 * outstanding request, and other enhancements.
12 * Support loadable low-level scsi drivers.
13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14 * eight major numbers.
15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17 * sd_init and cleanups.
18 * - Alex Davis <letmein@erols.com> Fix problem where partition info
19 * not being read in sd_open. Fix problem where removable media
20 * could be ejected after sd_open.
21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24 * Support 32k/1M disks.
26 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30 * - entering other commands: SCSI_LOG_HLQUEUE level 3
31 * Note: when the logging level is set by the user, it must be greater
32 * than the level indicated above to trigger output.
35 #include <linux/module.h>
37 #include <linux/kernel.h>
39 #include <linux/bio.h>
40 #include <linux/genhd.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <linux/async.h>
52 #include <linux/slab.h>
53 #include <linux/pm_runtime.h>
54 #include <asm/uaccess.h>
55 #include <asm/unaligned.h>
57 #include <scsi/scsi.h>
58 #include <scsi/scsi_cmnd.h>
59 #include <scsi/scsi_dbg.h>
60 #include <scsi/scsi_device.h>
61 #include <scsi/scsi_driver.h>
62 #include <scsi/scsi_eh.h>
63 #include <scsi/scsi_host.h>
64 #include <scsi/scsi_ioctl.h>
65 #include <scsi/scsicam.h>
68 #include "scsi_logging.h"
70 MODULE_AUTHOR("Eric Youngdale");
71 MODULE_DESCRIPTION("SCSI disk (sd) driver");
72 MODULE_LICENSE("GPL");
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
94 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
100 static void sd_config_discard(struct scsi_disk *, unsigned int);
101 static int sd_revalidate_disk(struct gendisk *);
102 static void sd_unlock_native_capacity(struct gendisk *disk);
103 static int sd_probe(struct device *);
104 static int sd_remove(struct device *);
105 static void sd_shutdown(struct device *);
106 static int sd_suspend(struct device *, pm_message_t state);
107 static int sd_resume(struct device *);
108 static void sd_rescan(struct device *);
109 static int sd_done(struct scsi_cmnd *);
110 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
111 static void scsi_disk_release(struct device *cdev);
112 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
113 static void sd_print_result(struct scsi_disk *, int);
115 static DEFINE_SPINLOCK(sd_index_lock);
116 static DEFINE_IDA(sd_index_ida);
118 /* This semaphore is used to mediate the 0->1 reference get in the
119 * face of object destruction (i.e. we can't allow a get on an
120 * object after last put) */
121 static DEFINE_MUTEX(sd_ref_mutex);
123 static struct kmem_cache *sd_cdb_cache;
124 static mempool_t *sd_cdb_pool;
126 static const char *sd_cache_types[] = {
127 "write through", "none", "write back",
128 "write back, no read (daft)"
132 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
133 const char *buf, size_t count)
135 int i, ct = -1, rcd, wce, sp;
136 struct scsi_disk *sdkp = to_scsi_disk(dev);
137 struct scsi_device *sdp = sdkp->device;
140 struct scsi_mode_data data;
141 struct scsi_sense_hdr sshdr;
144 if (sdp->type != TYPE_DISK)
145 /* no cache control on RBC devices; theoretically they
146 * can do it, but there's probably so many exceptions
147 * it's not worth the risk */
150 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
151 len = strlen(sd_cache_types[i]);
152 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
160 rcd = ct & 0x01 ? 1 : 0;
161 wce = ct & 0x02 ? 1 : 0;
162 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
163 SD_MAX_RETRIES, &data, NULL))
165 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
166 data.block_descriptor_length);
167 buffer_data = buffer + data.header_length +
168 data.block_descriptor_length;
169 buffer_data[2] &= ~0x05;
170 buffer_data[2] |= wce << 2 | rcd;
171 sp = buffer_data[0] & 0x80 ? 1 : 0;
173 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
174 SD_MAX_RETRIES, &data, &sshdr)) {
175 if (scsi_sense_valid(&sshdr))
176 sd_print_sense_hdr(sdkp, &sshdr);
179 revalidate_disk(sdkp->disk);
184 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
185 const char *buf, size_t count)
187 struct scsi_disk *sdkp = to_scsi_disk(dev);
188 struct scsi_device *sdp = sdkp->device;
190 if (!capable(CAP_SYS_ADMIN))
193 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
199 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
200 const char *buf, size_t count)
202 struct scsi_disk *sdkp = to_scsi_disk(dev);
203 struct scsi_device *sdp = sdkp->device;
205 if (!capable(CAP_SYS_ADMIN))
208 if (sdp->type != TYPE_DISK)
211 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
217 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
220 struct scsi_disk *sdkp = to_scsi_disk(dev);
221 int ct = sdkp->RCD + 2*sdkp->WCE;
223 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
227 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
229 struct scsi_disk *sdkp = to_scsi_disk(dev);
231 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
235 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
238 struct scsi_disk *sdkp = to_scsi_disk(dev);
239 struct scsi_device *sdp = sdkp->device;
241 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
245 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
248 struct scsi_disk *sdkp = to_scsi_disk(dev);
250 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
254 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
257 struct scsi_disk *sdkp = to_scsi_disk(dev);
259 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
263 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
266 struct scsi_disk *sdkp = to_scsi_disk(dev);
267 struct scsi_device *sdp = sdkp->device;
268 unsigned int dif, dix;
270 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
271 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
273 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
279 return snprintf(buf, 20, "none\n");
281 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
285 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
288 struct scsi_disk *sdkp = to_scsi_disk(dev);
290 return snprintf(buf, 20, "%u\n", sdkp->ATO);
294 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
297 struct scsi_disk *sdkp = to_scsi_disk(dev);
299 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
302 static const char *lbp_mode[] = {
303 [SD_LBP_FULL] = "full",
304 [SD_LBP_UNMAP] = "unmap",
305 [SD_LBP_WS16] = "writesame_16",
306 [SD_LBP_WS10] = "writesame_10",
307 [SD_LBP_ZERO] = "writesame_zero",
308 [SD_LBP_DISABLE] = "disabled",
312 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
315 struct scsi_disk *sdkp = to_scsi_disk(dev);
317 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
321 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
322 const char *buf, size_t count)
324 struct scsi_disk *sdkp = to_scsi_disk(dev);
325 struct scsi_device *sdp = sdkp->device;
327 if (!capable(CAP_SYS_ADMIN))
330 if (sdp->type != TYPE_DISK)
333 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
334 sd_config_discard(sdkp, SD_LBP_UNMAP);
335 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
336 sd_config_discard(sdkp, SD_LBP_WS16);
337 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
338 sd_config_discard(sdkp, SD_LBP_WS10);
339 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
340 sd_config_discard(sdkp, SD_LBP_ZERO);
341 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
342 sd_config_discard(sdkp, SD_LBP_DISABLE);
349 static struct device_attribute sd_disk_attrs[] = {
350 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
351 sd_store_cache_type),
352 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
353 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
354 sd_store_allow_restart),
355 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
356 sd_store_manage_start_stop),
357 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
358 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
359 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
360 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
361 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
362 sd_store_provisioning_mode),
366 static struct class sd_disk_class = {
368 .owner = THIS_MODULE,
369 .dev_release = scsi_disk_release,
370 .dev_attrs = sd_disk_attrs,
373 static struct scsi_driver sd_template = {
374 .owner = THIS_MODULE,
379 .suspend = sd_suspend,
381 .shutdown = sd_shutdown,
388 * Device no to disk mapping:
390 * major disc2 disc p1
391 * |............|.............|....|....| <- dev_t
394 * Inside a major, we have 16k disks, however mapped non-
395 * contiguously. The first 16 disks are for major0, the next
396 * ones with major1, ... Disk 256 is for major0 again, disk 272
398 * As we stay compatible with our numbering scheme, we can reuse
399 * the well-know SCSI majors 8, 65--71, 136--143.
401 static int sd_major(int major_idx)
405 return SCSI_DISK0_MAJOR;
407 return SCSI_DISK1_MAJOR + major_idx - 1;
409 return SCSI_DISK8_MAJOR + major_idx - 8;
412 return 0; /* shut up gcc */
416 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
418 struct scsi_disk *sdkp = NULL;
420 if (disk->private_data) {
421 sdkp = scsi_disk(disk);
422 if (scsi_device_get(sdkp->device) == 0)
423 get_device(&sdkp->dev);
430 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
432 struct scsi_disk *sdkp;
434 mutex_lock(&sd_ref_mutex);
435 sdkp = __scsi_disk_get(disk);
436 mutex_unlock(&sd_ref_mutex);
440 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
442 struct scsi_disk *sdkp;
444 mutex_lock(&sd_ref_mutex);
445 sdkp = dev_get_drvdata(dev);
447 sdkp = __scsi_disk_get(sdkp->disk);
448 mutex_unlock(&sd_ref_mutex);
452 static void scsi_disk_put(struct scsi_disk *sdkp)
454 struct scsi_device *sdev = sdkp->device;
456 mutex_lock(&sd_ref_mutex);
457 put_device(&sdkp->dev);
458 scsi_device_put(sdev);
459 mutex_unlock(&sd_ref_mutex);
462 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
464 unsigned int prot_op = SCSI_PROT_NORMAL;
465 unsigned int dix = scsi_prot_sg_count(scmd);
467 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
469 prot_op = SCSI_PROT_READ_PASS;
470 else if (dif && !dix)
471 prot_op = SCSI_PROT_READ_STRIP;
472 else if (!dif && dix)
473 prot_op = SCSI_PROT_READ_INSERT;
476 prot_op = SCSI_PROT_WRITE_PASS;
477 else if (dif && !dix)
478 prot_op = SCSI_PROT_WRITE_INSERT;
479 else if (!dif && dix)
480 prot_op = SCSI_PROT_WRITE_STRIP;
483 scsi_set_prot_op(scmd, prot_op);
484 scsi_set_prot_type(scmd, dif);
487 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
489 struct request_queue *q = sdkp->disk->queue;
490 unsigned int logical_block_size = sdkp->device->sector_size;
491 unsigned int max_blocks = 0;
493 q->limits.discard_zeroes_data = sdkp->lbprz;
494 q->limits.discard_alignment = sdkp->unmap_alignment *
496 q->limits.discard_granularity =
497 max(sdkp->physical_block_size,
498 sdkp->unmap_granularity * logical_block_size);
503 q->limits.max_discard_sectors = 0;
504 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
508 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
512 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
516 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
520 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
521 q->limits.discard_zeroes_data = 1;
525 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
526 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
528 sdkp->provisioning_mode = mode;
532 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
533 * @sdp: scsi device to operate one
534 * @rq: Request to prepare
536 * Will issue either UNMAP or WRITE SAME(16) depending on preference
537 * indicated by target device.
539 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
541 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
542 struct bio *bio = rq->bio;
543 sector_t sector = bio->bi_sector;
544 unsigned int nr_sectors = bio_sectors(bio);
550 if (sdkp->device->sector_size == 4096) {
555 rq->timeout = SD_TIMEOUT;
557 memset(rq->cmd, 0, rq->cmd_len);
559 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
561 return BLKPREP_DEFER;
563 switch (sdkp->provisioning_mode) {
565 buf = page_address(page);
571 put_unaligned_be16(6 + 16, &buf[0]);
572 put_unaligned_be16(16, &buf[2]);
573 put_unaligned_be64(sector, &buf[8]);
574 put_unaligned_be32(nr_sectors, &buf[16]);
581 rq->cmd[0] = WRITE_SAME_16;
582 rq->cmd[1] = 0x8; /* UNMAP */
583 put_unaligned_be64(sector, &rq->cmd[2]);
584 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
586 len = sdkp->device->sector_size;
592 rq->cmd[0] = WRITE_SAME;
593 if (sdkp->provisioning_mode == SD_LBP_WS10)
594 rq->cmd[1] = 0x8; /* UNMAP */
595 put_unaligned_be32(sector, &rq->cmd[2]);
596 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
598 len = sdkp->device->sector_size;
606 blk_add_request_payload(rq, page, len);
607 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
608 rq->buffer = page_address(page);
611 if (ret != BLKPREP_OK) {
618 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
620 rq->timeout = SD_FLUSH_TIMEOUT;
621 rq->retries = SD_MAX_RETRIES;
622 rq->cmd[0] = SYNCHRONIZE_CACHE;
625 return scsi_setup_blk_pc_cmnd(sdp, rq);
628 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
630 if (rq->cmd_flags & REQ_DISCARD) {
631 free_page((unsigned long)rq->buffer);
637 * sd_init_command - build a scsi (read or write) command from
638 * information in the request structure.
639 * @SCpnt: pointer to mid-level's per scsi command structure that
640 * contains request and into which the scsi command is written
642 * Returns 1 if successful and 0 if error (or cannot be done now).
644 static int sd_prep_fn(struct request_queue *q, struct request *rq)
646 struct scsi_cmnd *SCpnt;
647 struct scsi_device *sdp = q->queuedata;
648 struct gendisk *disk = rq->rq_disk;
649 struct scsi_disk *sdkp;
650 sector_t block = blk_rq_pos(rq);
652 unsigned int this_count = blk_rq_sectors(rq);
654 unsigned char protect;
657 * Discard request come in as REQ_TYPE_FS but we turn them into
658 * block PC requests to make life easier.
660 if (rq->cmd_flags & REQ_DISCARD) {
661 ret = scsi_setup_discard_cmnd(sdp, rq);
663 } else if (rq->cmd_flags & REQ_FLUSH) {
664 ret = scsi_setup_flush_cmnd(sdp, rq);
666 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
667 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
669 } else if (rq->cmd_type != REQ_TYPE_FS) {
673 ret = scsi_setup_fs_cmnd(sdp, rq);
674 if (ret != BLKPREP_OK)
677 sdkp = scsi_disk(disk);
679 /* from here on until we're complete, any goto out
680 * is used for a killable error condition */
683 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
684 "sd_init_command: block=%llu, "
686 (unsigned long long)block,
689 if (!sdp || !scsi_device_online(sdp) ||
690 block + blk_rq_sectors(rq) > get_capacity(disk)) {
691 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
692 "Finishing %u sectors\n",
693 blk_rq_sectors(rq)));
694 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
695 "Retry with 0x%p\n", SCpnt));
701 * quietly refuse to do anything to a changed disc until
702 * the changed bit has been reset
704 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
709 * Some SD card readers can't handle multi-sector accesses which touch
710 * the last one or two hardware sectors. Split accesses as needed.
712 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
713 (sdp->sector_size / 512);
715 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
716 if (block < threshold) {
717 /* Access up to the threshold but not beyond */
718 this_count = threshold - block;
720 /* Access only a single hardware sector */
721 this_count = sdp->sector_size / 512;
725 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
726 (unsigned long long)block));
729 * If we have a 1K hardware sectorsize, prevent access to single
730 * 512 byte sectors. In theory we could handle this - in fact
731 * the scsi cdrom driver must be able to handle this because
732 * we typically use 1K blocksizes, and cdroms typically have
733 * 2K hardware sectorsizes. Of course, things are simpler
734 * with the cdrom, since it is read-only. For performance
735 * reasons, the filesystems should be able to handle this
736 * and not force the scsi disk driver to use bounce buffers
739 if (sdp->sector_size == 1024) {
740 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
741 scmd_printk(KERN_ERR, SCpnt,
742 "Bad block number requested\n");
746 this_count = this_count >> 1;
749 if (sdp->sector_size == 2048) {
750 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
751 scmd_printk(KERN_ERR, SCpnt,
752 "Bad block number requested\n");
756 this_count = this_count >> 2;
759 if (sdp->sector_size == 4096) {
760 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
761 scmd_printk(KERN_ERR, SCpnt,
762 "Bad block number requested\n");
766 this_count = this_count >> 3;
769 if (rq_data_dir(rq) == WRITE) {
770 if (!sdp->writeable) {
773 SCpnt->cmnd[0] = WRITE_6;
774 SCpnt->sc_data_direction = DMA_TO_DEVICE;
776 if (blk_integrity_rq(rq) &&
777 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
780 } else if (rq_data_dir(rq) == READ) {
781 SCpnt->cmnd[0] = READ_6;
782 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
784 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
788 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
789 "%s %d/%u 512 byte blocks.\n",
790 (rq_data_dir(rq) == WRITE) ?
791 "writing" : "reading", this_count,
792 blk_rq_sectors(rq)));
794 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
795 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
801 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
802 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
804 if (unlikely(SCpnt->cmnd == NULL)) {
809 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
810 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
811 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
812 SCpnt->cmnd[7] = 0x18;
813 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
814 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
817 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
818 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
819 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
820 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
821 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
822 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
823 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
824 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
826 /* Expected Indirect LBA */
827 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
828 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
829 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
830 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
832 /* Transfer length */
833 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
834 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
835 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
836 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
837 } else if (block > 0xffffffff) {
838 SCpnt->cmnd[0] += READ_16 - READ_6;
839 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
840 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
841 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
842 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
843 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
844 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
845 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
846 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
847 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
848 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
849 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
850 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
851 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
852 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
853 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
854 scsi_device_protection(SCpnt->device) ||
855 SCpnt->device->use_10_for_rw) {
856 if (this_count > 0xffff)
859 SCpnt->cmnd[0] += READ_10 - READ_6;
860 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
861 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
862 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
863 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
864 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
865 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
866 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
867 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
869 if (unlikely(rq->cmd_flags & REQ_FUA)) {
871 * This happens only if this drive failed
872 * 10byte rw command with ILLEGAL_REQUEST
873 * during operation and thus turned off
876 scmd_printk(KERN_ERR, SCpnt,
877 "FUA write on READ/WRITE(6) drive\n");
881 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
882 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
883 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
884 SCpnt->cmnd[4] = (unsigned char) this_count;
887 SCpnt->sdb.length = this_count * sdp->sector_size;
889 /* If DIF or DIX is enabled, tell HBA how to handle request */
890 if (host_dif || scsi_prot_sg_count(SCpnt))
891 sd_prot_op(SCpnt, host_dif);
894 * We shouldn't disconnect in the middle of a sector, so with a dumb
895 * host adapter, it's safe to assume that we can at least transfer
896 * this many bytes between each connect / disconnect.
898 SCpnt->transfersize = sdp->sector_size;
899 SCpnt->underflow = this_count << 9;
900 SCpnt->allowed = SD_MAX_RETRIES;
903 * This indicates that the command is ready from our end to be
908 return scsi_prep_return(q, rq, ret);
912 * sd_open - open a scsi disk device
913 * @inode: only i_rdev member may be used
914 * @filp: only f_mode and f_flags may be used
916 * Returns 0 if successful. Returns a negated errno value in case
919 * Note: This can be called from a user context (e.g. fsck(1) )
920 * or from within the kernel (e.g. as a result of a mount(1) ).
921 * In the latter case @inode and @filp carry an abridged amount
922 * of information as noted above.
924 * Locking: called with bdev->bd_mutex held.
926 static int sd_open(struct block_device *bdev, fmode_t mode)
928 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
929 struct scsi_device *sdev;
935 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
939 retval = scsi_autopm_get_device(sdev);
944 * If the device is in error recovery, wait until it is done.
945 * If the device is offline, then disallow any access to it.
948 if (!scsi_block_when_processing_errors(sdev))
951 if (sdev->removable || sdkp->write_prot)
952 check_disk_change(bdev);
955 * If the drive is empty, just let the open fail.
958 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
962 * If the device has the write protect tab set, have the open fail
963 * if the user expects to be able to write to the thing.
966 if (sdkp->write_prot && (mode & FMODE_WRITE))
970 * It is possible that the disk changing stuff resulted in
971 * the device being taken offline. If this is the case,
972 * report this to the user, and don't pretend that the
973 * open actually succeeded.
976 if (!scsi_device_online(sdev))
979 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
980 if (scsi_block_when_processing_errors(sdev))
981 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
987 scsi_autopm_put_device(sdev);
994 * sd_release - invoked when the (last) close(2) is called on this
996 * @inode: only i_rdev member may be used
997 * @filp: only f_mode and f_flags may be used
1001 * Note: may block (uninterruptible) if error recovery is underway
1004 * Locking: called with bdev->bd_mutex held.
1006 static int sd_release(struct gendisk *disk, fmode_t mode)
1008 struct scsi_disk *sdkp = scsi_disk(disk);
1009 struct scsi_device *sdev = sdkp->device;
1011 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1013 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1014 if (scsi_block_when_processing_errors(sdev))
1015 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1019 * XXX and what if there are packets in flight and this close()
1020 * XXX is followed by a "rmmod sd_mod"?
1023 scsi_autopm_put_device(sdev);
1024 scsi_disk_put(sdkp);
1028 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1030 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1031 struct scsi_device *sdp = sdkp->device;
1032 struct Scsi_Host *host = sdp->host;
1035 /* default to most commonly used values */
1036 diskinfo[0] = 0x40; /* 1 << 6 */
1037 diskinfo[1] = 0x20; /* 1 << 5 */
1038 diskinfo[2] = sdkp->capacity >> 11;
1040 /* override with calculated, extended default, or driver values */
1041 if (host->hostt->bios_param)
1042 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1044 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1046 geo->heads = diskinfo[0];
1047 geo->sectors = diskinfo[1];
1048 geo->cylinders = diskinfo[2];
1053 * sd_ioctl - process an ioctl
1054 * @inode: only i_rdev/i_bdev members may be used
1055 * @filp: only f_mode and f_flags may be used
1056 * @cmd: ioctl command number
1057 * @arg: this is third argument given to ioctl(2) system call.
1058 * Often contains a pointer.
1060 * Returns 0 if successful (some ioctls return positive numbers on
1061 * success as well). Returns a negated errno value in case of error.
1063 * Note: most ioctls are forward onto the block subsystem or further
1064 * down in the scsi subsystem.
1066 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1067 unsigned int cmd, unsigned long arg)
1069 struct gendisk *disk = bdev->bd_disk;
1070 struct scsi_disk *sdkp = scsi_disk(disk);
1071 struct scsi_device *sdp = sdkp->device;
1072 void __user *p = (void __user *)arg;
1075 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1076 "cmd=0x%x\n", disk->disk_name, cmd));
1079 * If we are in the middle of error recovery, don't let anyone
1080 * else try and use this device. Also, if error recovery fails, it
1081 * may try and take the device offline, in which case all further
1082 * access to the device is prohibited.
1084 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1085 (mode & FMODE_NDELAY) != 0);
1086 if (!scsi_block_when_processing_errors(sdp) || !error)
1090 * Send SCSI addressing ioctls directly to mid level, send other
1091 * ioctls to block level and then onto mid level if they can't be
1095 case SCSI_IOCTL_GET_IDLUN:
1096 case SCSI_IOCTL_GET_BUS_NUMBER:
1097 error = scsi_ioctl(sdp, cmd, p);
1100 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
1101 if (error != -ENOTTY)
1103 error = scsi_ioctl(sdp, cmd, p);
1110 static void set_media_not_present(struct scsi_disk *sdkp)
1112 if (sdkp->media_present)
1113 sdkp->device->changed = 1;
1115 if (sdkp->device->removable) {
1116 sdkp->media_present = 0;
1121 static int media_not_present(struct scsi_disk *sdkp,
1122 struct scsi_sense_hdr *sshdr)
1124 if (!scsi_sense_valid(sshdr))
1127 /* not invoked for commands that could return deferred errors */
1128 switch (sshdr->sense_key) {
1129 case UNIT_ATTENTION:
1131 /* medium not present */
1132 if (sshdr->asc == 0x3A) {
1133 set_media_not_present(sdkp);
1141 * sd_check_events - check media events
1142 * @disk: kernel device descriptor
1143 * @clearing: disk events currently being cleared
1145 * Returns mask of DISK_EVENT_*.
1147 * Note: this function is invoked from the block subsystem.
1149 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1151 struct scsi_disk *sdkp = scsi_disk(disk);
1152 struct scsi_device *sdp = sdkp->device;
1153 struct scsi_sense_hdr *sshdr = NULL;
1156 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1159 * If the device is offline, don't send any commands - just pretend as
1160 * if the command failed. If the device ever comes back online, we
1161 * can deal with it then. It is only because of unrecoverable errors
1162 * that we would ever take a device offline in the first place.
1164 if (!scsi_device_online(sdp)) {
1165 set_media_not_present(sdkp);
1170 * Using TEST_UNIT_READY enables differentiation between drive with
1171 * no cartridge loaded - NOT READY, drive with changed cartridge -
1172 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1174 * Drives that auto spin down. eg iomega jaz 1G, will be started
1175 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1176 * sd_revalidate() is called.
1180 if (scsi_block_when_processing_errors(sdp)) {
1181 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1182 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1186 /* failed to execute TUR, assume media not present */
1187 if (host_byte(retval)) {
1188 set_media_not_present(sdkp);
1192 if (media_not_present(sdkp, sshdr))
1196 * For removable scsi disk we have to recognise the presence
1197 * of a disk in the drive.
1199 if (!sdkp->media_present)
1201 sdkp->media_present = 1;
1204 * sdp->changed is set under the following conditions:
1206 * Medium present state has changed in either direction.
1207 * Device has indicated UNIT_ATTENTION.
1210 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1215 static int sd_sync_cache(struct scsi_disk *sdkp)
1218 struct scsi_device *sdp = sdkp->device;
1219 struct scsi_sense_hdr sshdr;
1221 if (!scsi_device_online(sdp))
1225 for (retries = 3; retries > 0; --retries) {
1226 unsigned char cmd[10] = { 0 };
1228 cmd[0] = SYNCHRONIZE_CACHE;
1230 * Leave the rest of the command zero to indicate
1233 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1234 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1240 sd_print_result(sdkp, res);
1241 if (driver_byte(res) & DRIVER_SENSE)
1242 sd_print_sense_hdr(sdkp, &sshdr);
1250 static void sd_rescan(struct device *dev)
1252 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1255 revalidate_disk(sdkp->disk);
1256 scsi_disk_put(sdkp);
1261 #ifdef CONFIG_COMPAT
1263 * This gets directly called from VFS. When the ioctl
1264 * is not recognized we go back to the other translation paths.
1266 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1267 unsigned int cmd, unsigned long arg)
1269 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1272 * If we are in the middle of error recovery, don't let anyone
1273 * else try and use this device. Also, if error recovery fails, it
1274 * may try and take the device offline, in which case all further
1275 * access to the device is prohibited.
1277 if (!scsi_block_when_processing_errors(sdev))
1280 if (sdev->host->hostt->compat_ioctl) {
1283 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1289 * Let the static ioctl translation table take care of it.
1291 return -ENOIOCTLCMD;
1295 static const struct block_device_operations sd_fops = {
1296 .owner = THIS_MODULE,
1298 .release = sd_release,
1300 .getgeo = sd_getgeo,
1301 #ifdef CONFIG_COMPAT
1302 .compat_ioctl = sd_compat_ioctl,
1304 .check_events = sd_check_events,
1305 .revalidate_disk = sd_revalidate_disk,
1306 .unlock_native_capacity = sd_unlock_native_capacity,
1309 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1311 u64 start_lba = blk_rq_pos(scmd->request);
1312 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1316 * resid is optional but mostly filled in. When it's unused,
1317 * its value is zero, so we assume the whole buffer transferred
1319 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1320 unsigned int good_bytes;
1322 if (scmd->request->cmd_type != REQ_TYPE_FS)
1325 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1326 SCSI_SENSE_BUFFERSIZE,
1331 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1334 if (scmd->device->sector_size < 512) {
1335 /* only legitimate sector_size here is 256 */
1339 /* be careful ... don't want any overflows */
1340 u64 factor = scmd->device->sector_size / 512;
1341 do_div(start_lba, factor);
1342 do_div(end_lba, factor);
1345 /* The bad lba was reported incorrectly, we have no idea where
1348 if (bad_lba < start_lba || bad_lba >= end_lba)
1351 /* This computation should always be done in terms of
1352 * the resolution of the device's medium.
1354 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1355 return min(good_bytes, transferred);
1359 * sd_done - bottom half handler: called when the lower level
1360 * driver has completed (successfully or otherwise) a scsi command.
1361 * @SCpnt: mid-level's per command structure.
1363 * Note: potentially run from within an ISR. Must not block.
1365 static int sd_done(struct scsi_cmnd *SCpnt)
1367 int result = SCpnt->result;
1368 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1369 struct scsi_sense_hdr sshdr;
1370 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1371 int sense_valid = 0;
1372 int sense_deferred = 0;
1373 unsigned char op = SCpnt->cmnd[0];
1375 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1376 scsi_set_resid(SCpnt, 0);
1379 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1381 sense_deferred = scsi_sense_is_deferred(&sshdr);
1383 #ifdef CONFIG_SCSI_LOGGING
1384 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1386 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1387 "sd_done: sb[respc,sk,asc,"
1388 "ascq]=%x,%x,%x,%x\n",
1389 sshdr.response_code,
1390 sshdr.sense_key, sshdr.asc,
1394 if (driver_byte(result) != DRIVER_SENSE &&
1395 (!sense_valid || sense_deferred))
1398 switch (sshdr.sense_key) {
1399 case HARDWARE_ERROR:
1401 good_bytes = sd_completed_bytes(SCpnt);
1403 case RECOVERED_ERROR:
1404 good_bytes = scsi_bufflen(SCpnt);
1407 /* This indicates a false check condition, so ignore it. An
1408 * unknown amount of data was transferred so treat it as an
1411 scsi_print_sense("sd", SCpnt);
1413 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1415 case ABORTED_COMMAND:
1416 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1417 good_bytes = sd_completed_bytes(SCpnt);
1419 case ILLEGAL_REQUEST:
1420 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1421 good_bytes = sd_completed_bytes(SCpnt);
1422 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1423 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1424 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1425 sd_config_discard(sdkp, SD_LBP_DISABLE);
1431 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1432 sd_dif_complete(SCpnt, good_bytes);
1434 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1435 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1437 /* We have to print a failed command here as the
1438 * extended CDB gets freed before scsi_io_completion()
1442 scsi_print_command(SCpnt);
1444 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1453 * spinup disk - called only in sd_revalidate_disk()
1456 sd_spinup_disk(struct scsi_disk *sdkp)
1458 unsigned char cmd[10];
1459 unsigned long spintime_expire = 0;
1460 int retries, spintime;
1461 unsigned int the_result;
1462 struct scsi_sense_hdr sshdr;
1463 int sense_valid = 0;
1467 /* Spin up drives, as required. Only do this at boot time */
1468 /* Spinup needs to be done for module loads too. */
1473 cmd[0] = TEST_UNIT_READY;
1474 memset((void *) &cmd[1], 0, 9);
1476 the_result = scsi_execute_req(sdkp->device, cmd,
1479 SD_MAX_RETRIES, NULL);
1482 * If the drive has indicated to us that it
1483 * doesn't have any media in it, don't bother
1484 * with any more polling.
1486 if (media_not_present(sdkp, &sshdr))
1490 sense_valid = scsi_sense_valid(&sshdr);
1492 } while (retries < 3 &&
1493 (!scsi_status_is_good(the_result) ||
1494 ((driver_byte(the_result) & DRIVER_SENSE) &&
1495 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1497 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1498 /* no sense, TUR either succeeded or failed
1499 * with a status error */
1500 if(!spintime && !scsi_status_is_good(the_result)) {
1501 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1502 sd_print_result(sdkp, the_result);
1508 * The device does not want the automatic start to be issued.
1510 if (sdkp->device->no_start_on_add)
1513 if (sense_valid && sshdr.sense_key == NOT_READY) {
1514 if (sshdr.asc == 4 && sshdr.ascq == 3)
1515 break; /* manual intervention required */
1516 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1517 break; /* standby */
1518 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1519 break; /* unavailable */
1521 * Issue command to spin up drive when not ready
1524 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1525 cmd[0] = START_STOP;
1526 cmd[1] = 1; /* Return immediately */
1527 memset((void *) &cmd[2], 0, 8);
1528 cmd[4] = 1; /* Start spin cycle */
1529 if (sdkp->device->start_stop_pwr_cond)
1531 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1533 SD_TIMEOUT, SD_MAX_RETRIES,
1535 spintime_expire = jiffies + 100 * HZ;
1538 /* Wait 1 second for next try */
1543 * Wait for USB flash devices with slow firmware.
1544 * Yes, this sense key/ASC combination shouldn't
1545 * occur here. It's characteristic of these devices.
1547 } else if (sense_valid &&
1548 sshdr.sense_key == UNIT_ATTENTION &&
1549 sshdr.asc == 0x28) {
1551 spintime_expire = jiffies + 5 * HZ;
1554 /* Wait 1 second for next try */
1557 /* we don't understand the sense code, so it's
1558 * probably pointless to loop */
1560 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1561 sd_print_sense_hdr(sdkp, &sshdr);
1566 } while (spintime && time_before_eq(jiffies, spintime_expire));
1569 if (scsi_status_is_good(the_result))
1572 printk("not responding...\n");
1578 * Determine whether disk supports Data Integrity Field.
1580 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1582 struct scsi_device *sdp = sdkp->device;
1585 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1588 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1590 if (type == sdkp->protection_type || !sdkp->first_scan)
1593 sdkp->protection_type = type;
1595 if (type > SD_DIF_TYPE3_PROTECTION) {
1596 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1597 "protection type %u. Disabling disk!\n", type);
1602 if (scsi_host_dif_capable(sdp->host, type))
1603 sd_printk(KERN_NOTICE, sdkp,
1604 "Enabling DIF Type %u protection\n", type);
1606 sd_printk(KERN_NOTICE, sdkp,
1607 "Disabling DIF Type %u protection\n", type);
1610 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1611 struct scsi_sense_hdr *sshdr, int sense_valid,
1614 sd_print_result(sdkp, the_result);
1615 if (driver_byte(the_result) & DRIVER_SENSE)
1616 sd_print_sense_hdr(sdkp, sshdr);
1618 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1621 * Set dirty bit for removable devices if not ready -
1622 * sometimes drives will not report this properly.
1624 if (sdp->removable &&
1625 sense_valid && sshdr->sense_key == NOT_READY)
1626 set_media_not_present(sdkp);
1629 * We used to set media_present to 0 here to indicate no media
1630 * in the drive, but some drives fail read capacity even with
1631 * media present, so we can't do that.
1633 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1637 #if RC16_LEN > SD_BUF_SIZE
1638 #error RC16_LEN must not be more than SD_BUF_SIZE
1641 #define READ_CAPACITY_RETRIES_ON_RESET 10
1643 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1644 unsigned char *buffer)
1646 unsigned char cmd[16];
1647 struct scsi_sense_hdr sshdr;
1648 int sense_valid = 0;
1650 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1651 unsigned int alignment;
1652 unsigned long long lba;
1653 unsigned sector_size;
1655 if (sdp->no_read_capacity_16)
1660 cmd[0] = SERVICE_ACTION_IN;
1661 cmd[1] = SAI_READ_CAPACITY_16;
1663 memset(buffer, 0, RC16_LEN);
1665 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1666 buffer, RC16_LEN, &sshdr,
1667 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1669 if (media_not_present(sdkp, &sshdr))
1673 sense_valid = scsi_sense_valid(&sshdr);
1675 sshdr.sense_key == ILLEGAL_REQUEST &&
1676 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1678 /* Invalid Command Operation Code or
1679 * Invalid Field in CDB, just retry
1680 * silently with RC10 */
1683 sshdr.sense_key == UNIT_ATTENTION &&
1684 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1685 /* Device reset might occur several times,
1686 * give it one more chance */
1687 if (--reset_retries > 0)
1692 } while (the_result && retries);
1695 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1696 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1700 sector_size = get_unaligned_be32(&buffer[8]);
1701 lba = get_unaligned_be64(&buffer[0]);
1703 sd_read_protection_type(sdkp, buffer);
1705 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1706 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1707 "kernel compiled with support for large block "
1713 /* Logical blocks per physical block exponent */
1714 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1716 /* Lowest aligned logical block */
1717 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1718 blk_queue_alignment_offset(sdp->request_queue, alignment);
1719 if (alignment && sdkp->first_scan)
1720 sd_printk(KERN_NOTICE, sdkp,
1721 "physical block alignment offset: %u\n", alignment);
1723 if (buffer[14] & 0x80) { /* LBPME */
1726 if (buffer[14] & 0x40) /* LBPRZ */
1729 sd_config_discard(sdkp, SD_LBP_WS16);
1732 sdkp->capacity = lba + 1;
1736 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1737 unsigned char *buffer)
1739 unsigned char cmd[16];
1740 struct scsi_sense_hdr sshdr;
1741 int sense_valid = 0;
1743 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1745 unsigned sector_size;
1748 cmd[0] = READ_CAPACITY;
1749 memset(&cmd[1], 0, 9);
1750 memset(buffer, 0, 8);
1752 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1754 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1756 if (media_not_present(sdkp, &sshdr))
1760 sense_valid = scsi_sense_valid(&sshdr);
1762 sshdr.sense_key == UNIT_ATTENTION &&
1763 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1764 /* Device reset might occur several times,
1765 * give it one more chance */
1766 if (--reset_retries > 0)
1771 } while (the_result && retries);
1774 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1775 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1779 sector_size = get_unaligned_be32(&buffer[4]);
1780 lba = get_unaligned_be32(&buffer[0]);
1782 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1783 /* Some buggy (usb cardreader) devices return an lba of
1784 0xffffffff when the want to report a size of 0 (with
1785 which they really mean no media is present) */
1787 sdkp->physical_block_size = sector_size;
1791 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1792 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1793 "kernel compiled with support for large block "
1799 sdkp->capacity = lba + 1;
1800 sdkp->physical_block_size = sector_size;
1804 static int sd_try_rc16_first(struct scsi_device *sdp)
1806 if (sdp->host->max_cmd_len < 16)
1808 if (sdp->scsi_level > SCSI_SPC_2)
1810 if (scsi_device_protection(sdp))
1816 * read disk capacity
1819 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1822 struct scsi_device *sdp = sdkp->device;
1823 sector_t old_capacity = sdkp->capacity;
1825 if (sd_try_rc16_first(sdp)) {
1826 sector_size = read_capacity_16(sdkp, sdp, buffer);
1827 if (sector_size == -EOVERFLOW)
1829 if (sector_size == -ENODEV)
1831 if (sector_size < 0)
1832 sector_size = read_capacity_10(sdkp, sdp, buffer);
1833 if (sector_size < 0)
1836 sector_size = read_capacity_10(sdkp, sdp, buffer);
1837 if (sector_size == -EOVERFLOW)
1839 if (sector_size < 0)
1841 if ((sizeof(sdkp->capacity) > 4) &&
1842 (sdkp->capacity > 0xffffffffULL)) {
1843 int old_sector_size = sector_size;
1844 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1845 "Trying to use READ CAPACITY(16).\n");
1846 sector_size = read_capacity_16(sdkp, sdp, buffer);
1847 if (sector_size < 0) {
1848 sd_printk(KERN_NOTICE, sdkp,
1849 "Using 0xffffffff as device size\n");
1850 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1851 sector_size = old_sector_size;
1857 /* Some devices are known to return the total number of blocks,
1858 * not the highest block number. Some devices have versions
1859 * which do this and others which do not. Some devices we might
1860 * suspect of doing this but we don't know for certain.
1862 * If we know the reported capacity is wrong, decrement it. If
1863 * we can only guess, then assume the number of blocks is even
1864 * (usually true but not always) and err on the side of lowering
1867 if (sdp->fix_capacity ||
1868 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1869 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1870 "from its reported value: %llu\n",
1871 (unsigned long long) sdkp->capacity);
1876 if (sector_size == 0) {
1878 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1882 if (sector_size != 512 &&
1883 sector_size != 1024 &&
1884 sector_size != 2048 &&
1885 sector_size != 4096 &&
1886 sector_size != 256) {
1887 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1890 * The user might want to re-format the drive with
1891 * a supported sectorsize. Once this happens, it
1892 * would be relatively trivial to set the thing up.
1893 * For this reason, we leave the thing in the table.
1897 * set a bogus sector size so the normal read/write
1898 * logic in the block layer will eventually refuse any
1899 * request on this device without tripping over power
1900 * of two sector size assumptions
1904 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1907 char cap_str_2[10], cap_str_10[10];
1908 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1910 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1912 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1913 sizeof(cap_str_10));
1915 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1916 sd_printk(KERN_NOTICE, sdkp,
1917 "%llu %d-byte logical blocks: (%s/%s)\n",
1918 (unsigned long long)sdkp->capacity,
1919 sector_size, cap_str_10, cap_str_2);
1921 if (sdkp->physical_block_size != sector_size)
1922 sd_printk(KERN_NOTICE, sdkp,
1923 "%u-byte physical blocks\n",
1924 sdkp->physical_block_size);
1928 /* Rescale capacity to 512-byte units */
1929 if (sector_size == 4096)
1930 sdkp->capacity <<= 3;
1931 else if (sector_size == 2048)
1932 sdkp->capacity <<= 2;
1933 else if (sector_size == 1024)
1934 sdkp->capacity <<= 1;
1935 else if (sector_size == 256)
1936 sdkp->capacity >>= 1;
1938 blk_queue_physical_block_size(sdp->request_queue,
1939 sdkp->physical_block_size);
1940 sdkp->device->sector_size = sector_size;
1943 /* called with buffer of length 512 */
1945 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1946 unsigned char *buffer, int len, struct scsi_mode_data *data,
1947 struct scsi_sense_hdr *sshdr)
1949 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1950 SD_TIMEOUT, SD_MAX_RETRIES, data,
1955 * read write protect setting, if possible - called only in sd_revalidate_disk()
1956 * called with buffer of length SD_BUF_SIZE
1959 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1962 struct scsi_device *sdp = sdkp->device;
1963 struct scsi_mode_data data;
1964 int old_wp = sdkp->write_prot;
1966 set_disk_ro(sdkp->disk, 0);
1967 if (sdp->skip_ms_page_3f) {
1968 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1972 if (sdp->use_192_bytes_for_3f) {
1973 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1976 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1977 * We have to start carefully: some devices hang if we ask
1978 * for more than is available.
1980 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1983 * Second attempt: ask for page 0 When only page 0 is
1984 * implemented, a request for page 3F may return Sense Key
1985 * 5: Illegal Request, Sense Code 24: Invalid field in
1988 if (!scsi_status_is_good(res))
1989 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1992 * Third attempt: ask 255 bytes, as we did earlier.
1994 if (!scsi_status_is_good(res))
1995 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1999 if (!scsi_status_is_good(res)) {
2000 sd_printk(KERN_WARNING, sdkp,
2001 "Test WP failed, assume Write Enabled\n");
2003 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2004 set_disk_ro(sdkp->disk, sdkp->write_prot);
2005 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2006 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2007 sdkp->write_prot ? "on" : "off");
2008 sd_printk(KERN_DEBUG, sdkp,
2009 "Mode Sense: %02x %02x %02x %02x\n",
2010 buffer[0], buffer[1], buffer[2], buffer[3]);
2016 * sd_read_cache_type - called only from sd_revalidate_disk()
2017 * called with buffer of length SD_BUF_SIZE
2020 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2023 struct scsi_device *sdp = sdkp->device;
2028 struct scsi_mode_data data;
2029 struct scsi_sense_hdr sshdr;
2030 int old_wce = sdkp->WCE;
2031 int old_rcd = sdkp->RCD;
2032 int old_dpofua = sdkp->DPOFUA;
2035 if (sdp->skip_ms_page_8) {
2036 if (sdp->type == TYPE_RBC)
2039 if (sdp->skip_ms_page_3f)
2042 if (sdp->use_192_bytes_for_3f)
2046 } else if (sdp->type == TYPE_RBC) {
2054 /* cautiously ask */
2055 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2058 if (!scsi_status_is_good(res))
2061 if (!data.header_length) {
2064 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2067 /* that went OK, now ask for the proper length */
2071 * We're only interested in the first three bytes, actually.
2072 * But the data cache page is defined for the first 20.
2076 else if (len > SD_BUF_SIZE) {
2077 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2078 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2081 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2085 if (len > first_len)
2086 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2089 if (scsi_status_is_good(res)) {
2090 int offset = data.header_length + data.block_descriptor_length;
2092 while (offset < len) {
2093 u8 page_code = buffer[offset] & 0x3F;
2094 u8 spf = buffer[offset] & 0x40;
2096 if (page_code == 8 || page_code == 6) {
2097 /* We're interested only in the first 3 bytes.
2099 if (len - offset <= 2) {
2100 sd_printk(KERN_ERR, sdkp, "Incomplete "
2101 "mode parameter data\n");
2104 modepage = page_code;
2108 /* Go to the next page */
2109 if (spf && len - offset > 3)
2110 offset += 4 + (buffer[offset+2] << 8) +
2112 else if (!spf && len - offset > 1)
2113 offset += 2 + buffer[offset+1];
2115 sd_printk(KERN_ERR, sdkp, "Incomplete "
2116 "mode parameter data\n");
2122 if (modepage == 0x3F) {
2123 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2126 } else if ((buffer[offset] & 0x3f) != modepage) {
2127 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2131 if (modepage == 8) {
2132 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2133 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2135 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2139 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2140 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2141 sd_printk(KERN_NOTICE, sdkp,
2142 "Uses READ/WRITE(6), disabling FUA\n");
2146 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2147 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2148 sd_printk(KERN_NOTICE, sdkp,
2149 "Write cache: %s, read cache: %s, %s\n",
2150 sdkp->WCE ? "enabled" : "disabled",
2151 sdkp->RCD ? "disabled" : "enabled",
2152 sdkp->DPOFUA ? "supports DPO and FUA"
2153 : "doesn't support DPO or FUA");
2159 if (scsi_sense_valid(&sshdr) &&
2160 sshdr.sense_key == ILLEGAL_REQUEST &&
2161 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2162 /* Invalid field in CDB */
2163 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2165 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2168 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2175 * The ATO bit indicates whether the DIF application tag is available
2176 * for use by the operating system.
2178 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2181 struct scsi_device *sdp = sdkp->device;
2182 struct scsi_mode_data data;
2183 struct scsi_sense_hdr sshdr;
2185 if (sdp->type != TYPE_DISK)
2188 if (sdkp->protection_type == 0)
2191 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2192 SD_MAX_RETRIES, &data, &sshdr);
2194 if (!scsi_status_is_good(res) || !data.header_length ||
2196 sd_printk(KERN_WARNING, sdkp,
2197 "getting Control mode page failed, assume no ATO\n");
2199 if (scsi_sense_valid(&sshdr))
2200 sd_print_sense_hdr(sdkp, &sshdr);
2205 offset = data.header_length + data.block_descriptor_length;
2207 if ((buffer[offset] & 0x3f) != 0x0a) {
2208 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2212 if ((buffer[offset + 5] & 0x80) == 0)
2221 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2222 * @disk: disk to query
2224 static void sd_read_block_limits(struct scsi_disk *sdkp)
2226 unsigned int sector_sz = sdkp->device->sector_size;
2227 const int vpd_len = 64;
2228 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2231 /* Block Limits VPD */
2232 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2235 blk_queue_io_min(sdkp->disk->queue,
2236 get_unaligned_be16(&buffer[6]) * sector_sz);
2237 blk_queue_io_opt(sdkp->disk->queue,
2238 get_unaligned_be32(&buffer[12]) * sector_sz);
2240 if (buffer[3] == 0x3c) {
2241 unsigned int lba_count, desc_count;
2243 sdkp->max_ws_blocks =
2244 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2250 lba_count = get_unaligned_be32(&buffer[20]);
2251 desc_count = get_unaligned_be32(&buffer[24]);
2253 if (lba_count && desc_count)
2254 sdkp->max_unmap_blocks = lba_count;
2256 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2258 if (buffer[32] & 0x80)
2259 sdkp->unmap_alignment =
2260 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2262 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2264 if (sdkp->max_unmap_blocks)
2265 sd_config_discard(sdkp, SD_LBP_UNMAP);
2267 sd_config_discard(sdkp, SD_LBP_WS16);
2269 } else { /* LBP VPD page tells us what to use */
2271 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2272 sd_config_discard(sdkp, SD_LBP_UNMAP);
2273 else if (sdkp->lbpws)
2274 sd_config_discard(sdkp, SD_LBP_WS16);
2275 else if (sdkp->lbpws10)
2276 sd_config_discard(sdkp, SD_LBP_WS10);
2278 sd_config_discard(sdkp, SD_LBP_DISABLE);
2287 * sd_read_block_characteristics - Query block dev. characteristics
2288 * @disk: disk to query
2290 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2292 unsigned char *buffer;
2294 const int vpd_len = 64;
2296 buffer = kmalloc(vpd_len, GFP_KERNEL);
2299 /* Block Device Characteristics VPD */
2300 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2303 rot = get_unaligned_be16(&buffer[4]);
2306 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2313 * sd_read_block_provisioning - Query provisioning VPD page
2314 * @disk: disk to query
2316 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2318 unsigned char *buffer;
2319 const int vpd_len = 8;
2321 if (sdkp->lbpme == 0)
2324 buffer = kmalloc(vpd_len, GFP_KERNEL);
2326 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2330 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2331 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2332 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2338 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2341 * Although VPD inquiries can go to SCSI-2 type devices,
2342 * some USB ones crash on receiving them, and the pages
2343 * we currently ask for are for SPC-3 and beyond
2345 if (sdp->scsi_level > SCSI_SPC_2)
2351 * sd_revalidate_disk - called the first time a new disk is seen,
2352 * performs disk spin up, read_capacity, etc.
2353 * @disk: struct gendisk we care about
2355 static int sd_revalidate_disk(struct gendisk *disk)
2357 struct scsi_disk *sdkp = scsi_disk(disk);
2358 struct scsi_device *sdp = sdkp->device;
2359 unsigned char *buffer;
2362 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2363 "sd_revalidate_disk\n"));
2366 * If the device is offline, don't try and read capacity or any
2367 * of the other niceties.
2369 if (!scsi_device_online(sdp))
2372 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2374 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2375 "allocation failure.\n");
2379 sd_spinup_disk(sdkp);
2382 * Without media there is no reason to ask; moreover, some devices
2383 * react badly if we do.
2385 if (sdkp->media_present) {
2386 sd_read_capacity(sdkp, buffer);
2388 if (sd_try_extended_inquiry(sdp)) {
2389 sd_read_block_provisioning(sdkp);
2390 sd_read_block_limits(sdkp);
2391 sd_read_block_characteristics(sdkp);
2394 sd_read_write_protect_flag(sdkp, buffer);
2395 sd_read_cache_type(sdkp, buffer);
2396 sd_read_app_tag_own(sdkp, buffer);
2399 sdkp->first_scan = 0;
2402 * We now have all cache related info, determine how we deal
2403 * with flush requests.
2411 blk_queue_flush(sdkp->disk->queue, flush);
2413 set_capacity(disk, sdkp->capacity);
2421 * sd_unlock_native_capacity - unlock native capacity
2422 * @disk: struct gendisk to set capacity for
2424 * Block layer calls this function if it detects that partitions
2425 * on @disk reach beyond the end of the device. If the SCSI host
2426 * implements ->unlock_native_capacity() method, it's invoked to
2427 * give it a chance to adjust the device capacity.
2430 * Defined by block layer. Might sleep.
2432 static void sd_unlock_native_capacity(struct gendisk *disk)
2434 struct scsi_device *sdev = scsi_disk(disk)->device;
2436 if (sdev->host->hostt->unlock_native_capacity)
2437 sdev->host->hostt->unlock_native_capacity(sdev);
2441 * sd_format_disk_name - format disk name
2442 * @prefix: name prefix - ie. "sd" for SCSI disks
2443 * @index: index of the disk to format name for
2444 * @buf: output buffer
2445 * @buflen: length of the output buffer
2447 * SCSI disk names starts at sda. The 26th device is sdz and the
2448 * 27th is sdaa. The last one for two lettered suffix is sdzz
2449 * which is followed by sdaaa.
2451 * This is basically 26 base counting with one extra 'nil' entry
2452 * at the beginning from the second digit on and can be
2453 * determined using similar method as 26 base conversion with the
2454 * index shifted -1 after each digit is computed.
2460 * 0 on success, -errno on failure.
2462 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2464 const int base = 'z' - 'a' + 1;
2465 char *begin = buf + strlen(prefix);
2466 char *end = buf + buflen;
2476 *--p = 'a' + (index % unit);
2477 index = (index / unit) - 1;
2478 } while (index >= 0);
2480 memmove(begin, p, end - p);
2481 memcpy(buf, prefix, strlen(prefix));
2487 * The asynchronous part of sd_probe
2489 static void sd_probe_async(void *data, async_cookie_t cookie)
2491 struct scsi_disk *sdkp = data;
2492 struct scsi_device *sdp;
2499 index = sdkp->index;
2500 dev = &sdp->sdev_gendev;
2502 gd->major = sd_major((index & 0xf0) >> 4);
2503 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2504 gd->minors = SD_MINORS;
2506 gd->fops = &sd_fops;
2507 gd->private_data = &sdkp->driver;
2508 gd->queue = sdkp->device->request_queue;
2510 /* defaults, until the device tells us otherwise */
2511 sdp->sector_size = 512;
2513 sdkp->media_present = 1;
2514 sdkp->write_prot = 0;
2518 sdkp->first_scan = 1;
2520 sd_revalidate_disk(gd);
2522 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2523 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2525 gd->driverfs_dev = &sdp->sdev_gendev;
2526 gd->flags = GENHD_FL_EXT_DEVT;
2527 if (sdp->removable) {
2528 gd->flags |= GENHD_FL_REMOVABLE;
2529 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2533 sd_dif_config_host(sdkp);
2535 sd_revalidate_disk(gd);
2537 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2538 sdp->removable ? "removable " : "");
2539 scsi_autopm_put_device(sdp);
2540 put_device(&sdkp->dev);
2544 * sd_probe - called during driver initialization and whenever a
2545 * new scsi device is attached to the system. It is called once
2546 * for each scsi device (not just disks) present.
2547 * @dev: pointer to device object
2549 * Returns 0 if successful (or not interested in this scsi device
2550 * (e.g. scanner)); 1 when there is an error.
2552 * Note: this function is invoked from the scsi mid-level.
2553 * This function sets up the mapping between a given
2554 * <host,channel,id,lun> (found in sdp) and new device name
2555 * (e.g. /dev/sda). More precisely it is the block device major
2556 * and minor number that is chosen here.
2558 * Assume sd_attach is not re-entrant (for time being)
2559 * Also think about sd_attach() and sd_remove() running coincidentally.
2561 static int sd_probe(struct device *dev)
2563 struct scsi_device *sdp = to_scsi_device(dev);
2564 struct scsi_disk *sdkp;
2570 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2573 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2577 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2581 gd = alloc_disk(SD_MINORS);
2586 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2589 spin_lock(&sd_index_lock);
2590 error = ida_get_new(&sd_index_ida, &index);
2591 spin_unlock(&sd_index_lock);
2592 } while (error == -EAGAIN);
2595 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2599 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2601 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2602 goto out_free_index;
2606 sdkp->driver = &sd_template;
2608 sdkp->index = index;
2609 atomic_set(&sdkp->openers, 0);
2611 if (!sdp->request_queue->rq_timeout) {
2612 if (sdp->type != TYPE_MOD)
2613 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2615 blk_queue_rq_timeout(sdp->request_queue,
2619 device_initialize(&sdkp->dev);
2620 sdkp->dev.parent = dev;
2621 sdkp->dev.class = &sd_disk_class;
2622 dev_set_name(&sdkp->dev, dev_name(dev));
2624 if (device_add(&sdkp->dev))
2625 goto out_free_index;
2628 dev_set_drvdata(dev, sdkp);
2630 get_device(&sdkp->dev); /* prevent release before async_schedule */
2631 async_schedule(sd_probe_async, sdkp);
2636 spin_lock(&sd_index_lock);
2637 ida_remove(&sd_index_ida, index);
2638 spin_unlock(&sd_index_lock);
2648 * sd_remove - called whenever a scsi disk (previously recognized by
2649 * sd_probe) is detached from the system. It is called (potentially
2650 * multiple times) during sd module unload.
2651 * @sdp: pointer to mid level scsi device object
2653 * Note: this function is invoked from the scsi mid-level.
2654 * This function potentially frees up a device name (e.g. /dev/sdc)
2655 * that could be re-used by a subsequent sd_probe().
2656 * This function is not called when the built-in sd driver is "exit-ed".
2658 static int sd_remove(struct device *dev)
2660 struct scsi_disk *sdkp;
2662 sdkp = dev_get_drvdata(dev);
2663 scsi_autopm_get_device(sdkp->device);
2665 async_synchronize_full();
2666 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2667 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2668 device_del(&sdkp->dev);
2669 del_gendisk(sdkp->disk);
2672 mutex_lock(&sd_ref_mutex);
2673 dev_set_drvdata(dev, NULL);
2674 put_device(&sdkp->dev);
2675 mutex_unlock(&sd_ref_mutex);
2681 * scsi_disk_release - Called to free the scsi_disk structure
2682 * @dev: pointer to embedded class device
2684 * sd_ref_mutex must be held entering this routine. Because it is
2685 * called on last put, you should always use the scsi_disk_get()
2686 * scsi_disk_put() helpers which manipulate the semaphore directly
2687 * and never do a direct put_device.
2689 static void scsi_disk_release(struct device *dev)
2691 struct scsi_disk *sdkp = to_scsi_disk(dev);
2692 struct gendisk *disk = sdkp->disk;
2694 spin_lock(&sd_index_lock);
2695 ida_remove(&sd_index_ida, sdkp->index);
2696 spin_unlock(&sd_index_lock);
2698 disk->private_data = NULL;
2700 put_device(&sdkp->device->sdev_gendev);
2705 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2707 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2708 struct scsi_sense_hdr sshdr;
2709 struct scsi_device *sdp = sdkp->device;
2713 cmd[4] |= 1; /* START */
2715 if (sdp->start_stop_pwr_cond)
2716 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2718 if (!scsi_device_online(sdp))
2721 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2722 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2724 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2725 sd_print_result(sdkp, res);
2726 if (driver_byte(res) & DRIVER_SENSE)
2727 sd_print_sense_hdr(sdkp, &sshdr);
2734 * Send a SYNCHRONIZE CACHE instruction down to the device through
2735 * the normal SCSI command structure. Wait for the command to
2738 static void sd_shutdown(struct device *dev)
2740 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2743 return; /* this can happen */
2745 if (pm_runtime_suspended(dev))
2749 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2750 sd_sync_cache(sdkp);
2753 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2754 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2755 sd_start_stop_device(sdkp, 0);
2759 scsi_disk_put(sdkp);
2762 static int sd_suspend(struct device *dev, pm_message_t mesg)
2764 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2768 return 0; /* this can happen */
2771 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2772 ret = sd_sync_cache(sdkp);
2777 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2778 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2779 ret = sd_start_stop_device(sdkp, 0);
2783 scsi_disk_put(sdkp);
2787 static int sd_resume(struct device *dev)
2789 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2792 if (!sdkp->device->manage_start_stop)
2795 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2796 ret = sd_start_stop_device(sdkp, 1);
2799 scsi_disk_put(sdkp);
2804 * init_sd - entry point for this driver (both when built in or when
2807 * Note: this function registers this driver with the scsi mid-level.
2809 static int __init init_sd(void)
2811 int majors = 0, i, err;
2813 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2815 for (i = 0; i < SD_MAJORS; i++)
2816 if (register_blkdev(sd_major(i), "sd") == 0)
2822 err = class_register(&sd_disk_class);
2826 err = scsi_register_driver(&sd_template.gendrv);
2830 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2832 if (!sd_cdb_cache) {
2833 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2837 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2839 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2846 kmem_cache_destroy(sd_cdb_cache);
2849 class_unregister(&sd_disk_class);
2851 for (i = 0; i < SD_MAJORS; i++)
2852 unregister_blkdev(sd_major(i), "sd");
2857 * exit_sd - exit point for this driver (when it is a module).
2859 * Note: this function unregisters this driver from the scsi mid-level.
2861 static void __exit exit_sd(void)
2865 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2867 mempool_destroy(sd_cdb_pool);
2868 kmem_cache_destroy(sd_cdb_cache);
2870 scsi_unregister_driver(&sd_template.gendrv);
2871 class_unregister(&sd_disk_class);
2873 for (i = 0; i < SD_MAJORS; i++)
2874 unregister_blkdev(sd_major(i), "sd");
2877 module_init(init_sd);
2878 module_exit(exit_sd);
2880 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2881 struct scsi_sense_hdr *sshdr)
2883 sd_printk(KERN_INFO, sdkp, " ");
2884 scsi_show_sense_hdr(sshdr);
2885 sd_printk(KERN_INFO, sdkp, " ");
2886 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2889 static void sd_print_result(struct scsi_disk *sdkp, int result)
2891 sd_printk(KERN_INFO, sdkp, " ");
2892 scsi_show_result(result);