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 <asm/uaccess.h>
54 #include <asm/unaligned.h>
56 #include <scsi/scsi.h>
57 #include <scsi/scsi_cmnd.h>
58 #include <scsi/scsi_dbg.h>
59 #include <scsi/scsi_device.h>
60 #include <scsi/scsi_driver.h>
61 #include <scsi/scsi_eh.h>
62 #include <scsi/scsi_host.h>
63 #include <scsi/scsi_ioctl.h>
64 #include <scsi/scsicam.h>
67 #include "scsi_logging.h"
69 MODULE_AUTHOR("Eric Youngdale");
70 MODULE_DESCRIPTION("SCSI disk (sd) driver");
71 MODULE_LICENSE("GPL");
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
89 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
93 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
99 static void sd_config_discard(struct scsi_disk *, unsigned int);
100 static int sd_revalidate_disk(struct gendisk *);
101 static void sd_unlock_native_capacity(struct gendisk *disk);
102 static int sd_probe(struct device *);
103 static int sd_remove(struct device *);
104 static void sd_shutdown(struct device *);
105 static int sd_suspend(struct device *, pm_message_t state);
106 static int sd_resume(struct device *);
107 static void sd_rescan(struct device *);
108 static int sd_done(struct scsi_cmnd *);
109 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
110 static void scsi_disk_release(struct device *cdev);
111 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
112 static void sd_print_result(struct scsi_disk *, int);
114 static DEFINE_SPINLOCK(sd_index_lock);
115 static DEFINE_IDA(sd_index_ida);
117 /* This semaphore is used to mediate the 0->1 reference get in the
118 * face of object destruction (i.e. we can't allow a get on an
119 * object after last put) */
120 static DEFINE_MUTEX(sd_ref_mutex);
122 static struct kmem_cache *sd_cdb_cache;
123 static mempool_t *sd_cdb_pool;
125 static const char *sd_cache_types[] = {
126 "write through", "none", "write back",
127 "write back, no read (daft)"
131 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
132 const char *buf, size_t count)
134 int i, ct = -1, rcd, wce, sp;
135 struct scsi_disk *sdkp = to_scsi_disk(dev);
136 struct scsi_device *sdp = sdkp->device;
139 struct scsi_mode_data data;
140 struct scsi_sense_hdr sshdr;
141 static const char temp[] = "temporary ";
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 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
151 buf += sizeof(temp) - 1;
152 sdkp->cache_override = 1;
154 sdkp->cache_override = 0;
157 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
158 len = strlen(sd_cache_types[i]);
159 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
167 rcd = ct & 0x01 ? 1 : 0;
168 wce = ct & 0x02 ? 1 : 0;
170 if (sdkp->cache_override) {
176 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
177 SD_MAX_RETRIES, &data, NULL))
179 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
180 data.block_descriptor_length);
181 buffer_data = buffer + data.header_length +
182 data.block_descriptor_length;
183 buffer_data[2] &= ~0x05;
184 buffer_data[2] |= wce << 2 | rcd;
185 sp = buffer_data[0] & 0x80 ? 1 : 0;
187 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
188 SD_MAX_RETRIES, &data, &sshdr)) {
189 if (scsi_sense_valid(&sshdr))
190 sd_print_sense_hdr(sdkp, &sshdr);
193 revalidate_disk(sdkp->disk);
198 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
199 const char *buf, size_t count)
201 struct scsi_disk *sdkp = to_scsi_disk(dev);
202 struct scsi_device *sdp = sdkp->device;
204 if (!capable(CAP_SYS_ADMIN))
207 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
213 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
214 const char *buf, size_t count)
216 struct scsi_disk *sdkp = to_scsi_disk(dev);
217 struct scsi_device *sdp = sdkp->device;
219 if (!capable(CAP_SYS_ADMIN))
222 if (sdp->type != TYPE_DISK)
225 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
231 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
234 struct scsi_disk *sdkp = to_scsi_disk(dev);
235 int ct = sdkp->RCD + 2*sdkp->WCE;
237 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
241 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
243 struct scsi_disk *sdkp = to_scsi_disk(dev);
245 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
249 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
252 struct scsi_disk *sdkp = to_scsi_disk(dev);
253 struct scsi_device *sdp = sdkp->device;
255 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
259 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
262 struct scsi_disk *sdkp = to_scsi_disk(dev);
264 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
268 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
271 struct scsi_disk *sdkp = to_scsi_disk(dev);
273 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
277 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
280 struct scsi_disk *sdkp = to_scsi_disk(dev);
281 struct scsi_device *sdp = sdkp->device;
282 unsigned int dif, dix;
284 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
285 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
287 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
293 return snprintf(buf, 20, "none\n");
295 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
299 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
302 struct scsi_disk *sdkp = to_scsi_disk(dev);
304 return snprintf(buf, 20, "%u\n", sdkp->ATO);
308 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
311 struct scsi_disk *sdkp = to_scsi_disk(dev);
313 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
316 static const char *lbp_mode[] = {
317 [SD_LBP_FULL] = "full",
318 [SD_LBP_UNMAP] = "unmap",
319 [SD_LBP_WS16] = "writesame_16",
320 [SD_LBP_WS10] = "writesame_10",
321 [SD_LBP_ZERO] = "writesame_zero",
322 [SD_LBP_DISABLE] = "disabled",
326 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
329 struct scsi_disk *sdkp = to_scsi_disk(dev);
331 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
335 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
336 const char *buf, size_t count)
338 struct scsi_disk *sdkp = to_scsi_disk(dev);
339 struct scsi_device *sdp = sdkp->device;
341 if (!capable(CAP_SYS_ADMIN))
344 if (sdp->type != TYPE_DISK)
347 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
348 sd_config_discard(sdkp, SD_LBP_UNMAP);
349 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
350 sd_config_discard(sdkp, SD_LBP_WS16);
351 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
352 sd_config_discard(sdkp, SD_LBP_WS10);
353 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
354 sd_config_discard(sdkp, SD_LBP_ZERO);
355 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
356 sd_config_discard(sdkp, SD_LBP_DISABLE);
363 static struct device_attribute sd_disk_attrs[] = {
364 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
365 sd_store_cache_type),
366 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
367 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
368 sd_store_allow_restart),
369 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
370 sd_store_manage_start_stop),
371 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
372 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
373 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
374 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
375 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
376 sd_store_provisioning_mode),
380 static struct class sd_disk_class = {
382 .owner = THIS_MODULE,
383 .dev_release = scsi_disk_release,
384 .dev_attrs = sd_disk_attrs,
387 static struct scsi_driver sd_template = {
388 .owner = THIS_MODULE,
393 .suspend = sd_suspend,
395 .shutdown = sd_shutdown,
402 * Device no to disk mapping:
404 * major disc2 disc p1
405 * |............|.............|....|....| <- dev_t
408 * Inside a major, we have 16k disks, however mapped non-
409 * contiguously. The first 16 disks are for major0, the next
410 * ones with major1, ... Disk 256 is for major0 again, disk 272
412 * As we stay compatible with our numbering scheme, we can reuse
413 * the well-know SCSI majors 8, 65--71, 136--143.
415 static int sd_major(int major_idx)
419 return SCSI_DISK0_MAJOR;
421 return SCSI_DISK1_MAJOR + major_idx - 1;
423 return SCSI_DISK8_MAJOR + major_idx - 8;
426 return 0; /* shut up gcc */
430 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
432 struct scsi_disk *sdkp = NULL;
434 if (disk->private_data) {
435 sdkp = scsi_disk(disk);
436 if (scsi_device_get(sdkp->device) == 0)
437 get_device(&sdkp->dev);
444 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
446 struct scsi_disk *sdkp;
448 mutex_lock(&sd_ref_mutex);
449 sdkp = __scsi_disk_get(disk);
450 mutex_unlock(&sd_ref_mutex);
454 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
456 struct scsi_disk *sdkp;
458 mutex_lock(&sd_ref_mutex);
459 sdkp = dev_get_drvdata(dev);
461 sdkp = __scsi_disk_get(sdkp->disk);
462 mutex_unlock(&sd_ref_mutex);
466 static void scsi_disk_put(struct scsi_disk *sdkp)
468 struct scsi_device *sdev = sdkp->device;
470 mutex_lock(&sd_ref_mutex);
471 put_device(&sdkp->dev);
472 scsi_device_put(sdev);
473 mutex_unlock(&sd_ref_mutex);
476 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
478 unsigned int prot_op = SCSI_PROT_NORMAL;
479 unsigned int dix = scsi_prot_sg_count(scmd);
481 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
483 prot_op = SCSI_PROT_READ_PASS;
484 else if (dif && !dix)
485 prot_op = SCSI_PROT_READ_STRIP;
486 else if (!dif && dix)
487 prot_op = SCSI_PROT_READ_INSERT;
490 prot_op = SCSI_PROT_WRITE_PASS;
491 else if (dif && !dix)
492 prot_op = SCSI_PROT_WRITE_INSERT;
493 else if (!dif && dix)
494 prot_op = SCSI_PROT_WRITE_STRIP;
497 scsi_set_prot_op(scmd, prot_op);
498 scsi_set_prot_type(scmd, dif);
501 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
503 struct request_queue *q = sdkp->disk->queue;
504 unsigned int logical_block_size = sdkp->device->sector_size;
505 unsigned int max_blocks = 0;
507 q->limits.discard_zeroes_data = sdkp->lbprz;
508 q->limits.discard_alignment = sdkp->unmap_alignment *
510 q->limits.discard_granularity =
511 max(sdkp->physical_block_size,
512 sdkp->unmap_granularity * logical_block_size);
517 q->limits.max_discard_sectors = 0;
518 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
522 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
526 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
530 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
534 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
535 q->limits.discard_zeroes_data = 1;
539 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
540 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
542 sdkp->provisioning_mode = mode;
546 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
547 * @sdp: scsi device to operate one
548 * @rq: Request to prepare
550 * Will issue either UNMAP or WRITE SAME(16) depending on preference
551 * indicated by target device.
553 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
555 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
556 struct bio *bio = rq->bio;
557 sector_t sector = bio->bi_sector;
558 unsigned int nr_sectors = bio_sectors(bio);
564 if (sdkp->device->sector_size == 4096) {
569 rq->timeout = SD_TIMEOUT;
571 memset(rq->cmd, 0, rq->cmd_len);
573 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
575 return BLKPREP_DEFER;
577 switch (sdkp->provisioning_mode) {
579 buf = page_address(page);
585 put_unaligned_be16(6 + 16, &buf[0]);
586 put_unaligned_be16(16, &buf[2]);
587 put_unaligned_be64(sector, &buf[8]);
588 put_unaligned_be32(nr_sectors, &buf[16]);
595 rq->cmd[0] = WRITE_SAME_16;
596 rq->cmd[1] = 0x8; /* UNMAP */
597 put_unaligned_be64(sector, &rq->cmd[2]);
598 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
600 len = sdkp->device->sector_size;
606 rq->cmd[0] = WRITE_SAME;
607 if (sdkp->provisioning_mode == SD_LBP_WS10)
608 rq->cmd[1] = 0x8; /* UNMAP */
609 put_unaligned_be32(sector, &rq->cmd[2]);
610 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
612 len = sdkp->device->sector_size;
620 blk_add_request_payload(rq, page, len);
621 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
622 rq->buffer = page_address(page);
625 if (ret != BLKPREP_OK) {
632 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
634 rq->timeout = SD_FLUSH_TIMEOUT;
635 rq->retries = SD_MAX_RETRIES;
636 rq->cmd[0] = SYNCHRONIZE_CACHE;
639 return scsi_setup_blk_pc_cmnd(sdp, rq);
642 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
644 struct scsi_cmnd *SCpnt = rq->special;
646 if (rq->cmd_flags & REQ_DISCARD) {
647 free_page((unsigned long)rq->buffer);
650 if (SCpnt->cmnd != rq->cmd) {
651 mempool_free(SCpnt->cmnd, sd_cdb_pool);
658 * sd_init_command - build a scsi (read or write) command from
659 * information in the request structure.
660 * @SCpnt: pointer to mid-level's per scsi command structure that
661 * contains request and into which the scsi command is written
663 * Returns 1 if successful and 0 if error (or cannot be done now).
665 static int sd_prep_fn(struct request_queue *q, struct request *rq)
667 struct scsi_cmnd *SCpnt;
668 struct scsi_device *sdp = q->queuedata;
669 struct gendisk *disk = rq->rq_disk;
670 struct scsi_disk *sdkp;
671 sector_t block = blk_rq_pos(rq);
673 unsigned int this_count = blk_rq_sectors(rq);
675 unsigned char protect;
678 * Discard request come in as REQ_TYPE_FS but we turn them into
679 * block PC requests to make life easier.
681 if (rq->cmd_flags & REQ_DISCARD) {
682 ret = scsi_setup_discard_cmnd(sdp, rq);
684 } else if (rq->cmd_flags & REQ_FLUSH) {
685 ret = scsi_setup_flush_cmnd(sdp, rq);
687 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
688 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
690 } else if (rq->cmd_type != REQ_TYPE_FS) {
694 ret = scsi_setup_fs_cmnd(sdp, rq);
695 if (ret != BLKPREP_OK)
698 sdkp = scsi_disk(disk);
700 /* from here on until we're complete, any goto out
701 * is used for a killable error condition */
704 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
705 "sd_init_command: block=%llu, "
707 (unsigned long long)block,
710 if (!sdp || !scsi_device_online(sdp) ||
711 block + blk_rq_sectors(rq) > get_capacity(disk)) {
712 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
713 "Finishing %u sectors\n",
714 blk_rq_sectors(rq)));
715 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
716 "Retry with 0x%p\n", SCpnt));
722 * quietly refuse to do anything to a changed disc until
723 * the changed bit has been reset
725 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
730 * Some SD card readers can't handle multi-sector accesses which touch
731 * the last one or two hardware sectors. Split accesses as needed.
733 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
734 (sdp->sector_size / 512);
736 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
737 if (block < threshold) {
738 /* Access up to the threshold but not beyond */
739 this_count = threshold - block;
741 /* Access only a single hardware sector */
742 this_count = sdp->sector_size / 512;
746 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
747 (unsigned long long)block));
750 * If we have a 1K hardware sectorsize, prevent access to single
751 * 512 byte sectors. In theory we could handle this - in fact
752 * the scsi cdrom driver must be able to handle this because
753 * we typically use 1K blocksizes, and cdroms typically have
754 * 2K hardware sectorsizes. Of course, things are simpler
755 * with the cdrom, since it is read-only. For performance
756 * reasons, the filesystems should be able to handle this
757 * and not force the scsi disk driver to use bounce buffers
760 if (sdp->sector_size == 1024) {
761 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
762 scmd_printk(KERN_ERR, SCpnt,
763 "Bad block number requested\n");
767 this_count = this_count >> 1;
770 if (sdp->sector_size == 2048) {
771 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
772 scmd_printk(KERN_ERR, SCpnt,
773 "Bad block number requested\n");
777 this_count = this_count >> 2;
780 if (sdp->sector_size == 4096) {
781 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
782 scmd_printk(KERN_ERR, SCpnt,
783 "Bad block number requested\n");
787 this_count = this_count >> 3;
790 if (rq_data_dir(rq) == WRITE) {
791 if (!sdp->writeable) {
794 SCpnt->cmnd[0] = WRITE_6;
795 SCpnt->sc_data_direction = DMA_TO_DEVICE;
797 if (blk_integrity_rq(rq) &&
798 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
801 } else if (rq_data_dir(rq) == READ) {
802 SCpnt->cmnd[0] = READ_6;
803 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
805 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
809 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
810 "%s %d/%u 512 byte blocks.\n",
811 (rq_data_dir(rq) == WRITE) ?
812 "writing" : "reading", this_count,
813 blk_rq_sectors(rq)));
815 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
816 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
822 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
823 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
825 if (unlikely(SCpnt->cmnd == NULL)) {
830 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
831 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
832 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
833 SCpnt->cmnd[7] = 0x18;
834 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
835 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
838 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
839 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
840 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
841 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
842 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
843 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
844 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
845 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
847 /* Expected Indirect LBA */
848 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
849 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
850 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
851 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
853 /* Transfer length */
854 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
855 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
856 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
857 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
858 } else if (block > 0xffffffff) {
859 SCpnt->cmnd[0] += READ_16 - READ_6;
860 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
861 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
862 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
863 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
864 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
865 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
866 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
867 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
868 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
869 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
870 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
871 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
872 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
873 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
874 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
875 scsi_device_protection(SCpnt->device) ||
876 SCpnt->device->use_10_for_rw) {
877 if (this_count > 0xffff)
880 SCpnt->cmnd[0] += READ_10 - READ_6;
881 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
882 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
883 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
884 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
885 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
886 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
887 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
888 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
890 if (unlikely(rq->cmd_flags & REQ_FUA)) {
892 * This happens only if this drive failed
893 * 10byte rw command with ILLEGAL_REQUEST
894 * during operation and thus turned off
897 scmd_printk(KERN_ERR, SCpnt,
898 "FUA write on READ/WRITE(6) drive\n");
902 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
903 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
904 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
905 SCpnt->cmnd[4] = (unsigned char) this_count;
908 SCpnt->sdb.length = this_count * sdp->sector_size;
910 /* If DIF or DIX is enabled, tell HBA how to handle request */
911 if (host_dif || scsi_prot_sg_count(SCpnt))
912 sd_prot_op(SCpnt, host_dif);
915 * We shouldn't disconnect in the middle of a sector, so with a dumb
916 * host adapter, it's safe to assume that we can at least transfer
917 * this many bytes between each connect / disconnect.
919 SCpnt->transfersize = sdp->sector_size;
920 SCpnt->underflow = this_count << 9;
921 SCpnt->allowed = SD_MAX_RETRIES;
924 * This indicates that the command is ready from our end to be
929 return scsi_prep_return(q, rq, ret);
933 * sd_open - open a scsi disk device
934 * @inode: only i_rdev member may be used
935 * @filp: only f_mode and f_flags may be used
937 * Returns 0 if successful. Returns a negated errno value in case
940 * Note: This can be called from a user context (e.g. fsck(1) )
941 * or from within the kernel (e.g. as a result of a mount(1) ).
942 * In the latter case @inode and @filp carry an abridged amount
943 * of information as noted above.
945 * Locking: called with bdev->bd_mutex held.
947 static int sd_open(struct block_device *bdev, fmode_t mode)
949 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
950 struct scsi_device *sdev;
956 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
960 retval = scsi_autopm_get_device(sdev);
965 * If the device is in error recovery, wait until it is done.
966 * If the device is offline, then disallow any access to it.
969 if (!scsi_block_when_processing_errors(sdev))
972 if (sdev->removable || sdkp->write_prot)
973 check_disk_change(bdev);
976 * If the drive is empty, just let the open fail.
979 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
983 * If the device has the write protect tab set, have the open fail
984 * if the user expects to be able to write to the thing.
987 if (sdkp->write_prot && (mode & FMODE_WRITE))
991 * It is possible that the disk changing stuff resulted in
992 * the device being taken offline. If this is the case,
993 * report this to the user, and don't pretend that the
994 * open actually succeeded.
997 if (!scsi_device_online(sdev))
1000 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1001 if (scsi_block_when_processing_errors(sdev))
1002 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1008 scsi_autopm_put_device(sdev);
1010 scsi_disk_put(sdkp);
1015 * sd_release - invoked when the (last) close(2) is called on this
1017 * @inode: only i_rdev member may be used
1018 * @filp: only f_mode and f_flags may be used
1022 * Note: may block (uninterruptible) if error recovery is underway
1025 * Locking: called with bdev->bd_mutex held.
1027 static int sd_release(struct gendisk *disk, fmode_t mode)
1029 struct scsi_disk *sdkp = scsi_disk(disk);
1030 struct scsi_device *sdev = sdkp->device;
1032 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1034 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1035 if (scsi_block_when_processing_errors(sdev))
1036 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1040 * XXX and what if there are packets in flight and this close()
1041 * XXX is followed by a "rmmod sd_mod"?
1044 scsi_autopm_put_device(sdev);
1045 scsi_disk_put(sdkp);
1049 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1051 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1052 struct scsi_device *sdp = sdkp->device;
1053 struct Scsi_Host *host = sdp->host;
1054 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1057 /* default to most commonly used values */
1058 diskinfo[0] = 0x40; /* 1 << 6 */
1059 diskinfo[1] = 0x20; /* 1 << 5 */
1060 diskinfo[2] = capacity >> 11;
1062 /* override with calculated, extended default, or driver values */
1063 if (host->hostt->bios_param)
1064 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1066 scsicam_bios_param(bdev, capacity, diskinfo);
1068 geo->heads = diskinfo[0];
1069 geo->sectors = diskinfo[1];
1070 geo->cylinders = diskinfo[2];
1075 * sd_ioctl - process an ioctl
1076 * @inode: only i_rdev/i_bdev members may be used
1077 * @filp: only f_mode and f_flags may be used
1078 * @cmd: ioctl command number
1079 * @arg: this is third argument given to ioctl(2) system call.
1080 * Often contains a pointer.
1082 * Returns 0 if successful (some ioctls return positive numbers on
1083 * success as well). Returns a negated errno value in case of error.
1085 * Note: most ioctls are forward onto the block subsystem or further
1086 * down in the scsi subsystem.
1088 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1089 unsigned int cmd, unsigned long arg)
1091 struct gendisk *disk = bdev->bd_disk;
1092 struct scsi_disk *sdkp = scsi_disk(disk);
1093 struct scsi_device *sdp = sdkp->device;
1094 void __user *p = (void __user *)arg;
1097 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1098 "cmd=0x%x\n", disk->disk_name, cmd));
1100 error = scsi_verify_blk_ioctl(bdev, cmd);
1105 * If we are in the middle of error recovery, don't let anyone
1106 * else try and use this device. Also, if error recovery fails, it
1107 * may try and take the device offline, in which case all further
1108 * access to the device is prohibited.
1110 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1111 (mode & FMODE_NDELAY) != 0);
1112 if (!scsi_block_when_processing_errors(sdp) || !error)
1116 * Send SCSI addressing ioctls directly to mid level, send other
1117 * ioctls to block level and then onto mid level if they can't be
1121 case SCSI_IOCTL_GET_IDLUN:
1122 case SCSI_IOCTL_GET_BUS_NUMBER:
1123 error = scsi_ioctl(sdp, cmd, p);
1126 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1127 if (error != -ENOTTY)
1129 error = scsi_ioctl(sdp, cmd, p);
1136 static void set_media_not_present(struct scsi_disk *sdkp)
1138 if (sdkp->media_present)
1139 sdkp->device->changed = 1;
1141 if (sdkp->device->removable) {
1142 sdkp->media_present = 0;
1147 static int media_not_present(struct scsi_disk *sdkp,
1148 struct scsi_sense_hdr *sshdr)
1150 if (!scsi_sense_valid(sshdr))
1153 /* not invoked for commands that could return deferred errors */
1154 switch (sshdr->sense_key) {
1155 case UNIT_ATTENTION:
1157 /* medium not present */
1158 if (sshdr->asc == 0x3A) {
1159 set_media_not_present(sdkp);
1167 * sd_check_events - check media events
1168 * @disk: kernel device descriptor
1169 * @clearing: disk events currently being cleared
1171 * Returns mask of DISK_EVENT_*.
1173 * Note: this function is invoked from the block subsystem.
1175 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1177 struct scsi_disk *sdkp = scsi_disk(disk);
1178 struct scsi_device *sdp = sdkp->device;
1179 struct scsi_sense_hdr *sshdr = NULL;
1182 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1185 * If the device is offline, don't send any commands - just pretend as
1186 * if the command failed. If the device ever comes back online, we
1187 * can deal with it then. It is only because of unrecoverable errors
1188 * that we would ever take a device offline in the first place.
1190 if (!scsi_device_online(sdp)) {
1191 set_media_not_present(sdkp);
1196 * Using TEST_UNIT_READY enables differentiation between drive with
1197 * no cartridge loaded - NOT READY, drive with changed cartridge -
1198 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1200 * Drives that auto spin down. eg iomega jaz 1G, will be started
1201 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1202 * sd_revalidate() is called.
1206 if (scsi_block_when_processing_errors(sdp)) {
1207 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1208 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1212 /* failed to execute TUR, assume media not present */
1213 if (host_byte(retval)) {
1214 set_media_not_present(sdkp);
1218 if (media_not_present(sdkp, sshdr))
1222 * For removable scsi disk we have to recognise the presence
1223 * of a disk in the drive.
1225 if (!sdkp->media_present)
1227 sdkp->media_present = 1;
1230 * sdp->changed is set under the following conditions:
1232 * Medium present state has changed in either direction.
1233 * Device has indicated UNIT_ATTENTION.
1236 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1241 static int sd_sync_cache(struct scsi_disk *sdkp)
1244 struct scsi_device *sdp = sdkp->device;
1245 struct scsi_sense_hdr sshdr;
1247 if (!scsi_device_online(sdp))
1251 for (retries = 3; retries > 0; --retries) {
1252 unsigned char cmd[10] = { 0 };
1254 cmd[0] = SYNCHRONIZE_CACHE;
1256 * Leave the rest of the command zero to indicate
1259 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1260 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1266 sd_print_result(sdkp, res);
1267 if (driver_byte(res) & DRIVER_SENSE)
1268 sd_print_sense_hdr(sdkp, &sshdr);
1276 static void sd_rescan(struct device *dev)
1278 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1281 revalidate_disk(sdkp->disk);
1282 scsi_disk_put(sdkp);
1287 #ifdef CONFIG_COMPAT
1289 * This gets directly called from VFS. When the ioctl
1290 * is not recognized we go back to the other translation paths.
1292 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1293 unsigned int cmd, unsigned long arg)
1295 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1298 ret = scsi_verify_blk_ioctl(bdev, cmd);
1300 return -ENOIOCTLCMD;
1303 * If we are in the middle of error recovery, don't let anyone
1304 * else try and use this device. Also, if error recovery fails, it
1305 * may try and take the device offline, in which case all further
1306 * access to the device is prohibited.
1308 if (!scsi_block_when_processing_errors(sdev))
1311 if (sdev->host->hostt->compat_ioctl) {
1312 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1318 * Let the static ioctl translation table take care of it.
1320 return -ENOIOCTLCMD;
1324 static const struct block_device_operations sd_fops = {
1325 .owner = THIS_MODULE,
1327 .release = sd_release,
1329 .getgeo = sd_getgeo,
1330 #ifdef CONFIG_COMPAT
1331 .compat_ioctl = sd_compat_ioctl,
1333 .check_events = sd_check_events,
1334 .revalidate_disk = sd_revalidate_disk,
1335 .unlock_native_capacity = sd_unlock_native_capacity,
1338 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1340 u64 start_lba = blk_rq_pos(scmd->request);
1341 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1342 u64 factor = scmd->device->sector_size / 512;
1346 * resid is optional but mostly filled in. When it's unused,
1347 * its value is zero, so we assume the whole buffer transferred
1349 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1350 unsigned int good_bytes;
1352 if (scmd->request->cmd_type != REQ_TYPE_FS)
1355 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1356 SCSI_SENSE_BUFFERSIZE,
1361 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1364 /* be careful ... don't want any overflows */
1365 do_div(start_lba, factor);
1366 do_div(end_lba, factor);
1368 /* The bad lba was reported incorrectly, we have no idea where
1371 if (bad_lba < start_lba || bad_lba >= end_lba)
1374 /* This computation should always be done in terms of
1375 * the resolution of the device's medium.
1377 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1378 return min(good_bytes, transferred);
1382 * sd_done - bottom half handler: called when the lower level
1383 * driver has completed (successfully or otherwise) a scsi command.
1384 * @SCpnt: mid-level's per command structure.
1386 * Note: potentially run from within an ISR. Must not block.
1388 static int sd_done(struct scsi_cmnd *SCpnt)
1390 int result = SCpnt->result;
1391 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1392 struct scsi_sense_hdr sshdr;
1393 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1394 int sense_valid = 0;
1395 int sense_deferred = 0;
1396 unsigned char op = SCpnt->cmnd[0];
1398 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1399 scsi_set_resid(SCpnt, 0);
1402 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1404 sense_deferred = scsi_sense_is_deferred(&sshdr);
1406 #ifdef CONFIG_SCSI_LOGGING
1407 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1409 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1410 "sd_done: sb[respc,sk,asc,"
1411 "ascq]=%x,%x,%x,%x\n",
1412 sshdr.response_code,
1413 sshdr.sense_key, sshdr.asc,
1417 if (driver_byte(result) != DRIVER_SENSE &&
1418 (!sense_valid || sense_deferred))
1421 switch (sshdr.sense_key) {
1422 case HARDWARE_ERROR:
1424 good_bytes = sd_completed_bytes(SCpnt);
1426 case RECOVERED_ERROR:
1427 good_bytes = scsi_bufflen(SCpnt);
1430 /* This indicates a false check condition, so ignore it. An
1431 * unknown amount of data was transferred so treat it as an
1434 scsi_print_sense("sd", SCpnt);
1436 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1438 case ABORTED_COMMAND:
1439 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1440 good_bytes = sd_completed_bytes(SCpnt);
1442 case ILLEGAL_REQUEST:
1443 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1444 good_bytes = sd_completed_bytes(SCpnt);
1445 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1446 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1447 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1448 sd_config_discard(sdkp, SD_LBP_DISABLE);
1454 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1455 sd_dif_complete(SCpnt, good_bytes);
1461 * spinup disk - called only in sd_revalidate_disk()
1464 sd_spinup_disk(struct scsi_disk *sdkp)
1466 unsigned char cmd[10];
1467 unsigned long spintime_expire = 0;
1468 int retries, spintime;
1469 unsigned int the_result;
1470 struct scsi_sense_hdr sshdr;
1471 int sense_valid = 0;
1475 /* Spin up drives, as required. Only do this at boot time */
1476 /* Spinup needs to be done for module loads too. */
1481 cmd[0] = TEST_UNIT_READY;
1482 memset((void *) &cmd[1], 0, 9);
1484 the_result = scsi_execute_req(sdkp->device, cmd,
1487 SD_MAX_RETRIES, NULL);
1490 * If the drive has indicated to us that it
1491 * doesn't have any media in it, don't bother
1492 * with any more polling.
1494 if (media_not_present(sdkp, &sshdr))
1498 sense_valid = scsi_sense_valid(&sshdr);
1500 } while (retries < 3 &&
1501 (!scsi_status_is_good(the_result) ||
1502 ((driver_byte(the_result) & DRIVER_SENSE) &&
1503 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1505 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1506 /* no sense, TUR either succeeded or failed
1507 * with a status error */
1508 if(!spintime && !scsi_status_is_good(the_result)) {
1509 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1510 sd_print_result(sdkp, the_result);
1516 * The device does not want the automatic start to be issued.
1518 if (sdkp->device->no_start_on_add)
1521 if (sense_valid && sshdr.sense_key == NOT_READY) {
1522 if (sshdr.asc == 4 && sshdr.ascq == 3)
1523 break; /* manual intervention required */
1524 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1525 break; /* standby */
1526 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1527 break; /* unavailable */
1529 * Issue command to spin up drive when not ready
1532 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1533 cmd[0] = START_STOP;
1534 cmd[1] = 1; /* Return immediately */
1535 memset((void *) &cmd[2], 0, 8);
1536 cmd[4] = 1; /* Start spin cycle */
1537 if (sdkp->device->start_stop_pwr_cond)
1539 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1541 SD_TIMEOUT, SD_MAX_RETRIES,
1543 spintime_expire = jiffies + 100 * HZ;
1546 /* Wait 1 second for next try */
1551 * Wait for USB flash devices with slow firmware.
1552 * Yes, this sense key/ASC combination shouldn't
1553 * occur here. It's characteristic of these devices.
1555 } else if (sense_valid &&
1556 sshdr.sense_key == UNIT_ATTENTION &&
1557 sshdr.asc == 0x28) {
1559 spintime_expire = jiffies + 5 * HZ;
1562 /* Wait 1 second for next try */
1565 /* we don't understand the sense code, so it's
1566 * probably pointless to loop */
1568 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1569 sd_print_sense_hdr(sdkp, &sshdr);
1574 } while (spintime && time_before_eq(jiffies, spintime_expire));
1577 if (scsi_status_is_good(the_result))
1580 printk("not responding...\n");
1586 * Determine whether disk supports Data Integrity Field.
1588 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1590 struct scsi_device *sdp = sdkp->device;
1593 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1596 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1598 if (type == sdkp->protection_type || !sdkp->first_scan)
1601 sdkp->protection_type = type;
1603 if (type > SD_DIF_TYPE3_PROTECTION) {
1604 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1605 "protection type %u. Disabling disk!\n", type);
1610 if (scsi_host_dif_capable(sdp->host, type))
1611 sd_printk(KERN_NOTICE, sdkp,
1612 "Enabling DIF Type %u protection\n", type);
1614 sd_printk(KERN_NOTICE, sdkp,
1615 "Disabling DIF Type %u protection\n", type);
1618 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1619 struct scsi_sense_hdr *sshdr, int sense_valid,
1622 sd_print_result(sdkp, the_result);
1623 if (driver_byte(the_result) & DRIVER_SENSE)
1624 sd_print_sense_hdr(sdkp, sshdr);
1626 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1629 * Set dirty bit for removable devices if not ready -
1630 * sometimes drives will not report this properly.
1632 if (sdp->removable &&
1633 sense_valid && sshdr->sense_key == NOT_READY)
1634 set_media_not_present(sdkp);
1637 * We used to set media_present to 0 here to indicate no media
1638 * in the drive, but some drives fail read capacity even with
1639 * media present, so we can't do that.
1641 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1645 #if RC16_LEN > SD_BUF_SIZE
1646 #error RC16_LEN must not be more than SD_BUF_SIZE
1649 #define READ_CAPACITY_RETRIES_ON_RESET 10
1652 * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
1653 * and the reported logical block size is bigger than 512 bytes. Note
1654 * that last_sector is a u64 and therefore logical_to_sectors() is not
1657 static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
1659 u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
1661 if (sizeof(sector_t) == 4 && last_sector > 0xffffffffULL)
1667 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1668 unsigned char *buffer)
1670 unsigned char cmd[16];
1671 struct scsi_sense_hdr sshdr;
1672 int sense_valid = 0;
1674 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1675 unsigned int alignment;
1676 unsigned long long lba;
1677 unsigned sector_size;
1679 if (sdp->no_read_capacity_16)
1684 cmd[0] = SERVICE_ACTION_IN;
1685 cmd[1] = SAI_READ_CAPACITY_16;
1687 memset(buffer, 0, RC16_LEN);
1689 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1690 buffer, RC16_LEN, &sshdr,
1691 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1693 if (media_not_present(sdkp, &sshdr))
1697 sense_valid = scsi_sense_valid(&sshdr);
1699 sshdr.sense_key == ILLEGAL_REQUEST &&
1700 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1702 /* Invalid Command Operation Code or
1703 * Invalid Field in CDB, just retry
1704 * silently with RC10 */
1707 sshdr.sense_key == UNIT_ATTENTION &&
1708 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1709 /* Device reset might occur several times,
1710 * give it one more chance */
1711 if (--reset_retries > 0)
1716 } while (the_result && retries);
1719 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1720 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1724 sector_size = get_unaligned_be32(&buffer[8]);
1725 lba = get_unaligned_be64(&buffer[0]);
1727 sd_read_protection_type(sdkp, buffer);
1729 if (!sd_addressable_capacity(lba, sector_size)) {
1730 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1731 "kernel compiled with support for large block "
1737 /* Logical blocks per physical block exponent */
1738 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1740 /* Lowest aligned logical block */
1741 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1742 blk_queue_alignment_offset(sdp->request_queue, alignment);
1743 if (alignment && sdkp->first_scan)
1744 sd_printk(KERN_NOTICE, sdkp,
1745 "physical block alignment offset: %u\n", alignment);
1747 if (buffer[14] & 0x80) { /* LBPME */
1750 if (buffer[14] & 0x40) /* LBPRZ */
1753 sd_config_discard(sdkp, SD_LBP_WS16);
1756 sdkp->capacity = lba + 1;
1760 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1761 unsigned char *buffer)
1763 unsigned char cmd[16];
1764 struct scsi_sense_hdr sshdr;
1765 int sense_valid = 0;
1767 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1769 unsigned sector_size;
1772 cmd[0] = READ_CAPACITY;
1773 memset(&cmd[1], 0, 9);
1774 memset(buffer, 0, 8);
1776 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1778 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1780 if (media_not_present(sdkp, &sshdr))
1784 sense_valid = scsi_sense_valid(&sshdr);
1786 sshdr.sense_key == UNIT_ATTENTION &&
1787 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1788 /* Device reset might occur several times,
1789 * give it one more chance */
1790 if (--reset_retries > 0)
1795 } while (the_result && retries);
1798 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1799 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1803 sector_size = get_unaligned_be32(&buffer[4]);
1804 lba = get_unaligned_be32(&buffer[0]);
1806 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1807 /* Some buggy (usb cardreader) devices return an lba of
1808 0xffffffff when the want to report a size of 0 (with
1809 which they really mean no media is present) */
1811 sdkp->physical_block_size = sector_size;
1815 if (!sd_addressable_capacity(lba, sector_size)) {
1816 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1817 "kernel compiled with support for large block "
1823 sdkp->capacity = lba + 1;
1824 sdkp->physical_block_size = sector_size;
1828 static int sd_try_rc16_first(struct scsi_device *sdp)
1830 if (sdp->host->max_cmd_len < 16)
1832 if (sdp->scsi_level > SCSI_SPC_2)
1834 if (scsi_device_protection(sdp))
1840 * read disk capacity
1843 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1846 struct scsi_device *sdp = sdkp->device;
1847 sector_t old_capacity = sdkp->capacity;
1849 if (sd_try_rc16_first(sdp)) {
1850 sector_size = read_capacity_16(sdkp, sdp, buffer);
1851 if (sector_size == -EOVERFLOW)
1853 if (sector_size == -ENODEV)
1855 if (sector_size < 0)
1856 sector_size = read_capacity_10(sdkp, sdp, buffer);
1857 if (sector_size < 0)
1860 sector_size = read_capacity_10(sdkp, sdp, buffer);
1861 if (sector_size == -EOVERFLOW)
1863 if (sector_size < 0)
1865 if ((sizeof(sdkp->capacity) > 4) &&
1866 (sdkp->capacity > 0xffffffffULL)) {
1867 int old_sector_size = sector_size;
1868 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1869 "Trying to use READ CAPACITY(16).\n");
1870 sector_size = read_capacity_16(sdkp, sdp, buffer);
1871 if (sector_size < 0) {
1872 sd_printk(KERN_NOTICE, sdkp,
1873 "Using 0xffffffff as device size\n");
1874 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1875 sector_size = old_sector_size;
1881 /* Some devices are known to return the total number of blocks,
1882 * not the highest block number. Some devices have versions
1883 * which do this and others which do not. Some devices we might
1884 * suspect of doing this but we don't know for certain.
1886 * If we know the reported capacity is wrong, decrement it. If
1887 * we can only guess, then assume the number of blocks is even
1888 * (usually true but not always) and err on the side of lowering
1891 if (sdp->fix_capacity ||
1892 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1893 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1894 "from its reported value: %llu\n",
1895 (unsigned long long) sdkp->capacity);
1900 if (sector_size == 0) {
1902 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1906 if (sector_size != 512 &&
1907 sector_size != 1024 &&
1908 sector_size != 2048 &&
1909 sector_size != 4096) {
1910 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1913 * The user might want to re-format the drive with
1914 * a supported sectorsize. Once this happens, it
1915 * would be relatively trivial to set the thing up.
1916 * For this reason, we leave the thing in the table.
1920 * set a bogus sector size so the normal read/write
1921 * logic in the block layer will eventually refuse any
1922 * request on this device without tripping over power
1923 * of two sector size assumptions
1927 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1930 char cap_str_2[10], cap_str_10[10];
1931 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1933 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1935 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1936 sizeof(cap_str_10));
1938 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1939 sd_printk(KERN_NOTICE, sdkp,
1940 "%llu %d-byte logical blocks: (%s/%s)\n",
1941 (unsigned long long)sdkp->capacity,
1942 sector_size, cap_str_10, cap_str_2);
1944 if (sdkp->physical_block_size != sector_size)
1945 sd_printk(KERN_NOTICE, sdkp,
1946 "%u-byte physical blocks\n",
1947 sdkp->physical_block_size);
1951 blk_queue_physical_block_size(sdp->request_queue,
1952 sdkp->physical_block_size);
1953 sdkp->device->sector_size = sector_size;
1956 /* called with buffer of length 512 */
1958 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1959 unsigned char *buffer, int len, struct scsi_mode_data *data,
1960 struct scsi_sense_hdr *sshdr)
1962 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1963 SD_TIMEOUT, SD_MAX_RETRIES, data,
1968 * read write protect setting, if possible - called only in sd_revalidate_disk()
1969 * called with buffer of length SD_BUF_SIZE
1972 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1975 struct scsi_device *sdp = sdkp->device;
1976 struct scsi_mode_data data;
1977 int old_wp = sdkp->write_prot;
1979 set_disk_ro(sdkp->disk, 0);
1980 if (sdp->skip_ms_page_3f) {
1981 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1985 if (sdp->use_192_bytes_for_3f) {
1986 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1989 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1990 * We have to start carefully: some devices hang if we ask
1991 * for more than is available.
1993 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1996 * Second attempt: ask for page 0 When only page 0 is
1997 * implemented, a request for page 3F may return Sense Key
1998 * 5: Illegal Request, Sense Code 24: Invalid field in
2001 if (!scsi_status_is_good(res))
2002 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2005 * Third attempt: ask 255 bytes, as we did earlier.
2007 if (!scsi_status_is_good(res))
2008 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2012 if (!scsi_status_is_good(res)) {
2013 sd_printk(KERN_WARNING, sdkp,
2014 "Test WP failed, assume Write Enabled\n");
2016 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2017 set_disk_ro(sdkp->disk, sdkp->write_prot);
2018 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2019 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2020 sdkp->write_prot ? "on" : "off");
2021 sd_printk(KERN_DEBUG, sdkp,
2022 "Mode Sense: %02x %02x %02x %02x\n",
2023 buffer[0], buffer[1], buffer[2], buffer[3]);
2029 * sd_read_cache_type - called only from sd_revalidate_disk()
2030 * called with buffer of length SD_BUF_SIZE
2033 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2036 struct scsi_device *sdp = sdkp->device;
2041 struct scsi_mode_data data;
2042 struct scsi_sense_hdr sshdr;
2043 int old_wce = sdkp->WCE;
2044 int old_rcd = sdkp->RCD;
2045 int old_dpofua = sdkp->DPOFUA;
2048 if (sdkp->cache_override)
2052 if (sdp->skip_ms_page_8) {
2053 if (sdp->type == TYPE_RBC)
2056 if (sdp->skip_ms_page_3f)
2059 if (sdp->use_192_bytes_for_3f)
2063 } else if (sdp->type == TYPE_RBC) {
2071 /* cautiously ask */
2072 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2075 if (!scsi_status_is_good(res))
2078 if (!data.header_length) {
2081 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2084 /* that went OK, now ask for the proper length */
2088 * We're only interested in the first three bytes, actually.
2089 * But the data cache page is defined for the first 20.
2093 else if (len > SD_BUF_SIZE) {
2094 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2095 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2098 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2102 if (len > first_len)
2103 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2106 if (scsi_status_is_good(res)) {
2107 int offset = data.header_length + data.block_descriptor_length;
2109 while (offset < len) {
2110 u8 page_code = buffer[offset] & 0x3F;
2111 u8 spf = buffer[offset] & 0x40;
2113 if (page_code == 8 || page_code == 6) {
2114 /* We're interested only in the first 3 bytes.
2116 if (len - offset <= 2) {
2117 sd_printk(KERN_ERR, sdkp, "Incomplete "
2118 "mode parameter data\n");
2121 modepage = page_code;
2125 /* Go to the next page */
2126 if (spf && len - offset > 3)
2127 offset += 4 + (buffer[offset+2] << 8) +
2129 else if (!spf && len - offset > 1)
2130 offset += 2 + buffer[offset+1];
2132 sd_printk(KERN_ERR, sdkp, "Incomplete "
2133 "mode parameter data\n");
2139 sd_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2143 if (modepage == 8) {
2144 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2145 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2147 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2151 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2152 if (sdp->broken_fua) {
2153 sd_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2155 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2156 sd_printk(KERN_NOTICE, sdkp,
2157 "Uses READ/WRITE(6), disabling FUA\n");
2161 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2162 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2163 sd_printk(KERN_NOTICE, sdkp,
2164 "Write cache: %s, read cache: %s, %s\n",
2165 sdkp->WCE ? "enabled" : "disabled",
2166 sdkp->RCD ? "disabled" : "enabled",
2167 sdkp->DPOFUA ? "supports DPO and FUA"
2168 : "doesn't support DPO or FUA");
2174 if (scsi_sense_valid(&sshdr) &&
2175 sshdr.sense_key == ILLEGAL_REQUEST &&
2176 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2177 /* Invalid field in CDB */
2178 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2180 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2183 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2190 * The ATO bit indicates whether the DIF application tag is available
2191 * for use by the operating system.
2193 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2196 struct scsi_device *sdp = sdkp->device;
2197 struct scsi_mode_data data;
2198 struct scsi_sense_hdr sshdr;
2200 if (sdp->type != TYPE_DISK)
2203 if (sdkp->protection_type == 0)
2206 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2207 SD_MAX_RETRIES, &data, &sshdr);
2209 if (!scsi_status_is_good(res) || !data.header_length ||
2211 sd_printk(KERN_WARNING, sdkp,
2212 "getting Control mode page failed, assume no ATO\n");
2214 if (scsi_sense_valid(&sshdr))
2215 sd_print_sense_hdr(sdkp, &sshdr);
2220 offset = data.header_length + data.block_descriptor_length;
2222 if ((buffer[offset] & 0x3f) != 0x0a) {
2223 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2227 if ((buffer[offset + 5] & 0x80) == 0)
2236 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2237 * @disk: disk to query
2239 static void sd_read_block_limits(struct scsi_disk *sdkp)
2241 unsigned int sector_sz = sdkp->device->sector_size;
2242 const int vpd_len = 64;
2243 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2246 /* Block Limits VPD */
2247 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2250 blk_queue_io_min(sdkp->disk->queue,
2251 get_unaligned_be16(&buffer[6]) * sector_sz);
2252 blk_queue_io_opt(sdkp->disk->queue,
2253 get_unaligned_be32(&buffer[12]) * sector_sz);
2255 if (buffer[3] == 0x3c) {
2256 unsigned int lba_count, desc_count;
2258 sdkp->max_ws_blocks =
2259 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2265 lba_count = get_unaligned_be32(&buffer[20]);
2266 desc_count = get_unaligned_be32(&buffer[24]);
2268 if (lba_count && desc_count)
2269 sdkp->max_unmap_blocks = lba_count;
2271 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2273 if (buffer[32] & 0x80)
2274 sdkp->unmap_alignment =
2275 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2277 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2279 if (sdkp->max_unmap_blocks)
2280 sd_config_discard(sdkp, SD_LBP_UNMAP);
2282 sd_config_discard(sdkp, SD_LBP_WS16);
2284 } else { /* LBP VPD page tells us what to use */
2286 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2287 sd_config_discard(sdkp, SD_LBP_UNMAP);
2288 else if (sdkp->lbpws)
2289 sd_config_discard(sdkp, SD_LBP_WS16);
2290 else if (sdkp->lbpws10)
2291 sd_config_discard(sdkp, SD_LBP_WS10);
2293 sd_config_discard(sdkp, SD_LBP_DISABLE);
2302 * sd_read_block_characteristics - Query block dev. characteristics
2303 * @disk: disk to query
2305 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2307 unsigned char *buffer;
2309 const int vpd_len = 64;
2311 buffer = kmalloc(vpd_len, GFP_KERNEL);
2314 /* Block Device Characteristics VPD */
2315 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2318 rot = get_unaligned_be16(&buffer[4]);
2321 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2328 * sd_read_block_provisioning - Query provisioning VPD page
2329 * @disk: disk to query
2331 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2333 unsigned char *buffer;
2334 const int vpd_len = 8;
2336 if (sdkp->lbpme == 0)
2339 buffer = kmalloc(vpd_len, GFP_KERNEL);
2341 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2345 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2346 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2347 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2353 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2356 * Although VPD inquiries can go to SCSI-2 type devices,
2357 * some USB ones crash on receiving them, and the pages
2358 * we currently ask for are for SPC-3 and beyond
2360 if (sdp->scsi_level > SCSI_SPC_2)
2366 * sd_revalidate_disk - called the first time a new disk is seen,
2367 * performs disk spin up, read_capacity, etc.
2368 * @disk: struct gendisk we care about
2370 static int sd_revalidate_disk(struct gendisk *disk)
2372 struct scsi_disk *sdkp = scsi_disk(disk);
2373 struct scsi_device *sdp = sdkp->device;
2374 unsigned char *buffer;
2377 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2378 "sd_revalidate_disk\n"));
2381 * If the device is offline, don't try and read capacity or any
2382 * of the other niceties.
2384 if (!scsi_device_online(sdp))
2387 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2389 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2390 "allocation failure.\n");
2394 sd_spinup_disk(sdkp);
2397 * Without media there is no reason to ask; moreover, some devices
2398 * react badly if we do.
2400 if (sdkp->media_present) {
2401 sd_read_capacity(sdkp, buffer);
2403 if (sd_try_extended_inquiry(sdp)) {
2404 sd_read_block_provisioning(sdkp);
2405 sd_read_block_limits(sdkp);
2406 sd_read_block_characteristics(sdkp);
2409 sd_read_write_protect_flag(sdkp, buffer);
2410 sd_read_cache_type(sdkp, buffer);
2411 sd_read_app_tag_own(sdkp, buffer);
2414 sdkp->first_scan = 0;
2417 * We now have all cache related info, determine how we deal
2418 * with flush requests.
2426 blk_queue_flush(sdkp->disk->queue, flush);
2428 set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
2436 * sd_unlock_native_capacity - unlock native capacity
2437 * @disk: struct gendisk to set capacity for
2439 * Block layer calls this function if it detects that partitions
2440 * on @disk reach beyond the end of the device. If the SCSI host
2441 * implements ->unlock_native_capacity() method, it's invoked to
2442 * give it a chance to adjust the device capacity.
2445 * Defined by block layer. Might sleep.
2447 static void sd_unlock_native_capacity(struct gendisk *disk)
2449 struct scsi_device *sdev = scsi_disk(disk)->device;
2451 if (sdev->host->hostt->unlock_native_capacity)
2452 sdev->host->hostt->unlock_native_capacity(sdev);
2456 * sd_format_disk_name - format disk name
2457 * @prefix: name prefix - ie. "sd" for SCSI disks
2458 * @index: index of the disk to format name for
2459 * @buf: output buffer
2460 * @buflen: length of the output buffer
2462 * SCSI disk names starts at sda. The 26th device is sdz and the
2463 * 27th is sdaa. The last one for two lettered suffix is sdzz
2464 * which is followed by sdaaa.
2466 * This is basically 26 base counting with one extra 'nil' entry
2467 * at the beginning from the second digit on and can be
2468 * determined using similar method as 26 base conversion with the
2469 * index shifted -1 after each digit is computed.
2475 * 0 on success, -errno on failure.
2477 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2479 const int base = 'z' - 'a' + 1;
2480 char *begin = buf + strlen(prefix);
2481 char *end = buf + buflen;
2491 *--p = 'a' + (index % unit);
2492 index = (index / unit) - 1;
2493 } while (index >= 0);
2495 memmove(begin, p, end - p);
2496 memcpy(buf, prefix, strlen(prefix));
2502 * The asynchronous part of sd_probe
2504 static void sd_probe_async(void *data, async_cookie_t cookie)
2506 struct scsi_disk *sdkp = data;
2507 struct scsi_device *sdp;
2514 index = sdkp->index;
2515 dev = &sdp->sdev_gendev;
2517 gd->major = sd_major((index & 0xf0) >> 4);
2518 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2519 gd->minors = SD_MINORS;
2521 gd->fops = &sd_fops;
2522 gd->private_data = &sdkp->driver;
2523 gd->queue = sdkp->device->request_queue;
2525 /* defaults, until the device tells us otherwise */
2526 sdp->sector_size = 512;
2528 sdkp->media_present = 1;
2529 sdkp->write_prot = 0;
2530 sdkp->cache_override = 0;
2534 sdkp->first_scan = 1;
2536 sd_revalidate_disk(gd);
2538 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2539 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2541 gd->driverfs_dev = &sdp->sdev_gendev;
2542 gd->flags = GENHD_FL_EXT_DEVT;
2543 if (sdp->removable) {
2544 gd->flags |= GENHD_FL_REMOVABLE;
2545 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2549 sd_dif_config_host(sdkp);
2551 sd_revalidate_disk(gd);
2553 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2554 sdp->removable ? "removable " : "");
2555 scsi_autopm_put_device(sdp);
2556 put_device(&sdkp->dev);
2560 * sd_probe - called during driver initialization and whenever a
2561 * new scsi device is attached to the system. It is called once
2562 * for each scsi device (not just disks) present.
2563 * @dev: pointer to device object
2565 * Returns 0 if successful (or not interested in this scsi device
2566 * (e.g. scanner)); 1 when there is an error.
2568 * Note: this function is invoked from the scsi mid-level.
2569 * This function sets up the mapping between a given
2570 * <host,channel,id,lun> (found in sdp) and new device name
2571 * (e.g. /dev/sda). More precisely it is the block device major
2572 * and minor number that is chosen here.
2574 * Assume sd_attach is not re-entrant (for time being)
2575 * Also think about sd_attach() and sd_remove() running coincidentally.
2577 static int sd_probe(struct device *dev)
2579 struct scsi_device *sdp = to_scsi_device(dev);
2580 struct scsi_disk *sdkp;
2586 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2589 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2593 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2597 gd = alloc_disk(SD_MINORS);
2602 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2605 spin_lock(&sd_index_lock);
2606 error = ida_get_new(&sd_index_ida, &index);
2607 spin_unlock(&sd_index_lock);
2608 } while (error == -EAGAIN);
2611 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2615 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2617 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2618 goto out_free_index;
2622 sdkp->driver = &sd_template;
2624 sdkp->index = index;
2625 atomic_set(&sdkp->openers, 0);
2627 if (!sdp->request_queue->rq_timeout) {
2628 if (sdp->type != TYPE_MOD)
2629 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2631 blk_queue_rq_timeout(sdp->request_queue,
2635 device_initialize(&sdkp->dev);
2636 sdkp->dev.parent = dev;
2637 sdkp->dev.class = &sd_disk_class;
2638 dev_set_name(&sdkp->dev, dev_name(dev));
2640 if (device_add(&sdkp->dev))
2641 goto out_free_index;
2644 dev_set_drvdata(dev, sdkp);
2646 get_device(&sdkp->dev); /* prevent release before async_schedule */
2647 async_schedule(sd_probe_async, sdkp);
2652 spin_lock(&sd_index_lock);
2653 ida_remove(&sd_index_ida, index);
2654 spin_unlock(&sd_index_lock);
2664 * sd_remove - called whenever a scsi disk (previously recognized by
2665 * sd_probe) is detached from the system. It is called (potentially
2666 * multiple times) during sd module unload.
2667 * @sdp: pointer to mid level scsi device object
2669 * Note: this function is invoked from the scsi mid-level.
2670 * This function potentially frees up a device name (e.g. /dev/sdc)
2671 * that could be re-used by a subsequent sd_probe().
2672 * This function is not called when the built-in sd driver is "exit-ed".
2674 static int sd_remove(struct device *dev)
2676 struct scsi_disk *sdkp;
2678 sdkp = dev_get_drvdata(dev);
2679 scsi_autopm_get_device(sdkp->device);
2681 async_synchronize_full();
2682 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2683 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2684 device_del(&sdkp->dev);
2685 del_gendisk(sdkp->disk);
2688 mutex_lock(&sd_ref_mutex);
2689 dev_set_drvdata(dev, NULL);
2690 put_device(&sdkp->dev);
2691 mutex_unlock(&sd_ref_mutex);
2697 * scsi_disk_release - Called to free the scsi_disk structure
2698 * @dev: pointer to embedded class device
2700 * sd_ref_mutex must be held entering this routine. Because it is
2701 * called on last put, you should always use the scsi_disk_get()
2702 * scsi_disk_put() helpers which manipulate the semaphore directly
2703 * and never do a direct put_device.
2705 static void scsi_disk_release(struct device *dev)
2707 struct scsi_disk *sdkp = to_scsi_disk(dev);
2708 struct gendisk *disk = sdkp->disk;
2710 spin_lock(&sd_index_lock);
2711 ida_remove(&sd_index_ida, sdkp->index);
2712 spin_unlock(&sd_index_lock);
2714 disk->private_data = NULL;
2716 put_device(&sdkp->device->sdev_gendev);
2721 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2723 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2724 struct scsi_sense_hdr sshdr;
2725 struct scsi_device *sdp = sdkp->device;
2729 cmd[4] |= 1; /* START */
2731 if (sdp->start_stop_pwr_cond)
2732 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2734 if (!scsi_device_online(sdp))
2737 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2738 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2740 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2741 sd_print_result(sdkp, res);
2742 if (driver_byte(res) & DRIVER_SENSE)
2743 sd_print_sense_hdr(sdkp, &sshdr);
2750 * Send a SYNCHRONIZE CACHE instruction down to the device through
2751 * the normal SCSI command structure. Wait for the command to
2754 static void sd_shutdown(struct device *dev)
2756 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2759 return; /* this can happen */
2762 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2763 sd_sync_cache(sdkp);
2766 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2767 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2768 sd_start_stop_device(sdkp, 0);
2771 scsi_disk_put(sdkp);
2774 static int sd_suspend(struct device *dev, pm_message_t mesg)
2776 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2779 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
2783 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2784 ret = sd_sync_cache(sdkp);
2789 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2790 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2791 ret = sd_start_stop_device(sdkp, 0);
2795 scsi_disk_put(sdkp);
2799 static int sd_resume(struct device *dev)
2801 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2804 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
2807 if (!sdkp->device->manage_start_stop)
2810 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2811 ret = sd_start_stop_device(sdkp, 1);
2814 scsi_disk_put(sdkp);
2819 * init_sd - entry point for this driver (both when built in or when
2822 * Note: this function registers this driver with the scsi mid-level.
2824 static int __init init_sd(void)
2826 int majors = 0, i, err;
2828 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2830 for (i = 0; i < SD_MAJORS; i++)
2831 if (register_blkdev(sd_major(i), "sd") == 0)
2837 err = class_register(&sd_disk_class);
2841 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2843 if (!sd_cdb_cache) {
2844 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2848 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2850 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2854 err = scsi_register_driver(&sd_template.gendrv);
2856 goto err_out_driver;
2861 mempool_destroy(sd_cdb_pool);
2864 kmem_cache_destroy(sd_cdb_cache);
2867 class_unregister(&sd_disk_class);
2869 for (i = 0; i < SD_MAJORS; i++)
2870 unregister_blkdev(sd_major(i), "sd");
2875 * exit_sd - exit point for this driver (when it is a module).
2877 * Note: this function unregisters this driver from the scsi mid-level.
2879 static void __exit exit_sd(void)
2883 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2885 scsi_unregister_driver(&sd_template.gendrv);
2886 mempool_destroy(sd_cdb_pool);
2887 kmem_cache_destroy(sd_cdb_cache);
2889 class_unregister(&sd_disk_class);
2891 for (i = 0; i < SD_MAJORS; i++)
2892 unregister_blkdev(sd_major(i), "sd");
2895 module_init(init_sd);
2896 module_exit(exit_sd);
2898 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2899 struct scsi_sense_hdr *sshdr)
2901 sd_printk(KERN_INFO, sdkp, " ");
2902 scsi_show_sense_hdr(sshdr);
2903 sd_printk(KERN_INFO, sdkp, " ");
2904 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2907 static void sd_print_result(struct scsi_disk *sdkp, int result)
2909 sd_printk(KERN_INFO, sdkp, " ");
2910 scsi_show_result(result);