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/smp_lock.h>
50 #include <linux/mutex.h>
51 #include <linux/string_helpers.h>
52 #include <linux/async.h>
53 #include <linux/slab.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 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;
143 if (sdp->type != TYPE_DISK)
144 /* no cache control on RBC devices; theoretically they
145 * can do it, but there's probably so many exceptions
146 * it's not worth the risk */
149 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
150 len = strlen(sd_cache_types[i]);
151 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
159 rcd = ct & 0x01 ? 1 : 0;
160 wce = ct & 0x02 ? 1 : 0;
161 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
162 SD_MAX_RETRIES, &data, NULL))
164 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
165 data.block_descriptor_length);
166 buffer_data = buffer + data.header_length +
167 data.block_descriptor_length;
168 buffer_data[2] &= ~0x05;
169 buffer_data[2] |= wce << 2 | rcd;
170 sp = buffer_data[0] & 0x80 ? 1 : 0;
172 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
173 SD_MAX_RETRIES, &data, &sshdr)) {
174 if (scsi_sense_valid(&sshdr))
175 sd_print_sense_hdr(sdkp, &sshdr);
178 revalidate_disk(sdkp->disk);
183 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
184 const char *buf, size_t count)
186 struct scsi_disk *sdkp = to_scsi_disk(dev);
187 struct scsi_device *sdp = sdkp->device;
189 if (!capable(CAP_SYS_ADMIN))
192 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
198 sd_store_allow_restart(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 if (sdp->type != TYPE_DISK)
210 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
216 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
219 struct scsi_disk *sdkp = to_scsi_disk(dev);
220 int ct = sdkp->RCD + 2*sdkp->WCE;
222 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
226 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
228 struct scsi_disk *sdkp = to_scsi_disk(dev);
230 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
234 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
237 struct scsi_disk *sdkp = to_scsi_disk(dev);
238 struct scsi_device *sdp = sdkp->device;
240 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
244 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
247 struct scsi_disk *sdkp = to_scsi_disk(dev);
249 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
253 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
256 struct scsi_disk *sdkp = to_scsi_disk(dev);
258 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
262 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
265 struct scsi_disk *sdkp = to_scsi_disk(dev);
266 struct scsi_device *sdp = sdkp->device;
267 unsigned int dif, dix;
269 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
270 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
272 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
278 return snprintf(buf, 20, "none\n");
280 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
284 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
287 struct scsi_disk *sdkp = to_scsi_disk(dev);
289 return snprintf(buf, 20, "%u\n", sdkp->ATO);
293 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
296 struct scsi_disk *sdkp = to_scsi_disk(dev);
298 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning);
301 static struct device_attribute sd_disk_attrs[] = {
302 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
303 sd_store_cache_type),
304 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
305 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
306 sd_store_allow_restart),
307 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
308 sd_store_manage_start_stop),
309 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
310 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
311 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
312 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
316 static struct class sd_disk_class = {
318 .owner = THIS_MODULE,
319 .dev_release = scsi_disk_release,
320 .dev_attrs = sd_disk_attrs,
323 static struct scsi_driver sd_template = {
324 .owner = THIS_MODULE,
329 .suspend = sd_suspend,
331 .shutdown = sd_shutdown,
338 * Device no to disk mapping:
340 * major disc2 disc p1
341 * |............|.............|....|....| <- dev_t
344 * Inside a major, we have 16k disks, however mapped non-
345 * contiguously. The first 16 disks are for major0, the next
346 * ones with major1, ... Disk 256 is for major0 again, disk 272
348 * As we stay compatible with our numbering scheme, we can reuse
349 * the well-know SCSI majors 8, 65--71, 136--143.
351 static int sd_major(int major_idx)
355 return SCSI_DISK0_MAJOR;
357 return SCSI_DISK1_MAJOR + major_idx - 1;
359 return SCSI_DISK8_MAJOR + major_idx - 8;
362 return 0; /* shut up gcc */
366 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
368 struct scsi_disk *sdkp = NULL;
370 if (disk->private_data) {
371 sdkp = scsi_disk(disk);
372 if (scsi_device_get(sdkp->device) == 0)
373 get_device(&sdkp->dev);
380 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
382 struct scsi_disk *sdkp;
384 mutex_lock(&sd_ref_mutex);
385 sdkp = __scsi_disk_get(disk);
386 mutex_unlock(&sd_ref_mutex);
390 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
392 struct scsi_disk *sdkp;
394 mutex_lock(&sd_ref_mutex);
395 sdkp = dev_get_drvdata(dev);
397 sdkp = __scsi_disk_get(sdkp->disk);
398 mutex_unlock(&sd_ref_mutex);
402 static void scsi_disk_put(struct scsi_disk *sdkp)
404 struct scsi_device *sdev = sdkp->device;
406 mutex_lock(&sd_ref_mutex);
407 put_device(&sdkp->dev);
408 scsi_device_put(sdev);
409 mutex_unlock(&sd_ref_mutex);
412 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
414 unsigned int prot_op = SCSI_PROT_NORMAL;
415 unsigned int dix = scsi_prot_sg_count(scmd);
417 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
419 prot_op = SCSI_PROT_READ_PASS;
420 else if (dif && !dix)
421 prot_op = SCSI_PROT_READ_STRIP;
422 else if (!dif && dix)
423 prot_op = SCSI_PROT_READ_INSERT;
426 prot_op = SCSI_PROT_WRITE_PASS;
427 else if (dif && !dix)
428 prot_op = SCSI_PROT_WRITE_INSERT;
429 else if (!dif && dix)
430 prot_op = SCSI_PROT_WRITE_STRIP;
433 scsi_set_prot_op(scmd, prot_op);
434 scsi_set_prot_type(scmd, dif);
438 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
439 * @sdp: scsi device to operate one
440 * @rq: Request to prepare
442 * Will issue either UNMAP or WRITE SAME(16) depending on preference
443 * indicated by target device.
445 static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
447 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
448 struct bio *bio = rq->bio;
449 sector_t sector = bio->bi_sector;
450 unsigned int nr_sectors = bio_sectors(bio);
455 if (sdkp->device->sector_size == 4096) {
460 rq->timeout = SD_TIMEOUT;
462 memset(rq->cmd, 0, rq->cmd_len);
464 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
466 return BLKPREP_DEFER;
469 char *buf = page_address(page);
475 put_unaligned_be16(6 + 16, &buf[0]);
476 put_unaligned_be16(16, &buf[2]);
477 put_unaligned_be64(sector, &buf[8]);
478 put_unaligned_be32(nr_sectors, &buf[16]);
483 rq->cmd[0] = WRITE_SAME_16;
484 rq->cmd[1] = 0x8; /* UNMAP */
485 put_unaligned_be64(sector, &rq->cmd[2]);
486 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
488 len = sdkp->device->sector_size;
491 blk_add_request_payload(rq, page, len);
492 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
493 rq->buffer = page_address(page);
494 if (ret != BLKPREP_OK) {
501 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
503 rq->timeout = SD_FLUSH_TIMEOUT;
504 rq->retries = SD_MAX_RETRIES;
505 rq->cmd[0] = SYNCHRONIZE_CACHE;
508 return scsi_setup_blk_pc_cmnd(sdp, rq);
511 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
513 if (rq->cmd_flags & REQ_DISCARD) {
514 free_page((unsigned long)rq->buffer);
520 * sd_init_command - build a scsi (read or write) command from
521 * information in the request structure.
522 * @SCpnt: pointer to mid-level's per scsi command structure that
523 * contains request and into which the scsi command is written
525 * Returns 1 if successful and 0 if error (or cannot be done now).
527 static int sd_prep_fn(struct request_queue *q, struct request *rq)
529 struct scsi_cmnd *SCpnt;
530 struct scsi_device *sdp = q->queuedata;
531 struct gendisk *disk = rq->rq_disk;
532 struct scsi_disk *sdkp;
533 sector_t block = blk_rq_pos(rq);
535 unsigned int this_count = blk_rq_sectors(rq);
537 unsigned char protect;
540 * Discard request come in as REQ_TYPE_FS but we turn them into
541 * block PC requests to make life easier.
543 if (rq->cmd_flags & REQ_DISCARD) {
544 ret = scsi_setup_discard_cmnd(sdp, rq);
546 } else if (rq->cmd_flags & REQ_FLUSH) {
547 ret = scsi_setup_flush_cmnd(sdp, rq);
549 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
550 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
552 } else if (rq->cmd_type != REQ_TYPE_FS) {
556 ret = scsi_setup_fs_cmnd(sdp, rq);
557 if (ret != BLKPREP_OK)
560 sdkp = scsi_disk(disk);
562 /* from here on until we're complete, any goto out
563 * is used for a killable error condition */
566 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
567 "sd_init_command: block=%llu, "
569 (unsigned long long)block,
572 if (!sdp || !scsi_device_online(sdp) ||
573 block + blk_rq_sectors(rq) > get_capacity(disk)) {
574 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
575 "Finishing %u sectors\n",
576 blk_rq_sectors(rq)));
577 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
578 "Retry with 0x%p\n", SCpnt));
584 * quietly refuse to do anything to a changed disc until
585 * the changed bit has been reset
587 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
592 * Some SD card readers can't handle multi-sector accesses which touch
593 * the last one or two hardware sectors. Split accesses as needed.
595 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
596 (sdp->sector_size / 512);
598 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
599 if (block < threshold) {
600 /* Access up to the threshold but not beyond */
601 this_count = threshold - block;
603 /* Access only a single hardware sector */
604 this_count = sdp->sector_size / 512;
608 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
609 (unsigned long long)block));
612 * If we have a 1K hardware sectorsize, prevent access to single
613 * 512 byte sectors. In theory we could handle this - in fact
614 * the scsi cdrom driver must be able to handle this because
615 * we typically use 1K blocksizes, and cdroms typically have
616 * 2K hardware sectorsizes. Of course, things are simpler
617 * with the cdrom, since it is read-only. For performance
618 * reasons, the filesystems should be able to handle this
619 * and not force the scsi disk driver to use bounce buffers
622 if (sdp->sector_size == 1024) {
623 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
624 scmd_printk(KERN_ERR, SCpnt,
625 "Bad block number requested\n");
629 this_count = this_count >> 1;
632 if (sdp->sector_size == 2048) {
633 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
634 scmd_printk(KERN_ERR, SCpnt,
635 "Bad block number requested\n");
639 this_count = this_count >> 2;
642 if (sdp->sector_size == 4096) {
643 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
644 scmd_printk(KERN_ERR, SCpnt,
645 "Bad block number requested\n");
649 this_count = this_count >> 3;
652 if (rq_data_dir(rq) == WRITE) {
653 if (!sdp->writeable) {
656 SCpnt->cmnd[0] = WRITE_6;
657 SCpnt->sc_data_direction = DMA_TO_DEVICE;
659 if (blk_integrity_rq(rq) &&
660 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
663 } else if (rq_data_dir(rq) == READ) {
664 SCpnt->cmnd[0] = READ_6;
665 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
667 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
671 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
672 "%s %d/%u 512 byte blocks.\n",
673 (rq_data_dir(rq) == WRITE) ?
674 "writing" : "reading", this_count,
675 blk_rq_sectors(rq)));
677 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
678 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
684 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
685 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
687 if (unlikely(SCpnt->cmnd == NULL)) {
692 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
693 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
694 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
695 SCpnt->cmnd[7] = 0x18;
696 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
697 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
700 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
701 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
702 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
703 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
704 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
705 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
706 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
707 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
709 /* Expected Indirect LBA */
710 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
711 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
712 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
713 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
715 /* Transfer length */
716 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
717 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
718 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
719 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
720 } else if (block > 0xffffffff) {
721 SCpnt->cmnd[0] += READ_16 - READ_6;
722 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
723 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
724 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
725 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
726 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
727 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
728 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
729 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
730 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
731 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
732 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
733 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
734 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
735 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
736 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
737 scsi_device_protection(SCpnt->device) ||
738 SCpnt->device->use_10_for_rw) {
739 if (this_count > 0xffff)
742 SCpnt->cmnd[0] += READ_10 - READ_6;
743 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
744 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
745 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
746 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
747 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
748 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
749 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
750 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
752 if (unlikely(rq->cmd_flags & REQ_FUA)) {
754 * This happens only if this drive failed
755 * 10byte rw command with ILLEGAL_REQUEST
756 * during operation and thus turned off
759 scmd_printk(KERN_ERR, SCpnt,
760 "FUA write on READ/WRITE(6) drive\n");
764 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
765 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
766 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
767 SCpnt->cmnd[4] = (unsigned char) this_count;
770 SCpnt->sdb.length = this_count * sdp->sector_size;
772 /* If DIF or DIX is enabled, tell HBA how to handle request */
773 if (host_dif || scsi_prot_sg_count(SCpnt))
774 sd_prot_op(SCpnt, host_dif);
777 * We shouldn't disconnect in the middle of a sector, so with a dumb
778 * host adapter, it's safe to assume that we can at least transfer
779 * this many bytes between each connect / disconnect.
781 SCpnt->transfersize = sdp->sector_size;
782 SCpnt->underflow = this_count << 9;
783 SCpnt->allowed = SD_MAX_RETRIES;
786 * This indicates that the command is ready from our end to be
791 return scsi_prep_return(q, rq, ret);
795 * sd_open - open a scsi disk device
796 * @inode: only i_rdev member may be used
797 * @filp: only f_mode and f_flags may be used
799 * Returns 0 if successful. Returns a negated errno value in case
802 * Note: This can be called from a user context (e.g. fsck(1) )
803 * or from within the kernel (e.g. as a result of a mount(1) ).
804 * In the latter case @inode and @filp carry an abridged amount
805 * of information as noted above.
807 * Locking: called with bdev->bd_mutex held.
809 static int sd_open(struct block_device *bdev, fmode_t mode)
811 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
812 struct scsi_device *sdev;
818 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
822 retval = scsi_autopm_get_device(sdev);
827 * If the device is in error recovery, wait until it is done.
828 * If the device is offline, then disallow any access to it.
831 if (!scsi_block_when_processing_errors(sdev))
834 if (sdev->removable || sdkp->write_prot)
835 check_disk_change(bdev);
838 * If the drive is empty, just let the open fail.
841 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
845 * If the device has the write protect tab set, have the open fail
846 * if the user expects to be able to write to the thing.
849 if (sdkp->write_prot && (mode & FMODE_WRITE))
853 * It is possible that the disk changing stuff resulted in
854 * the device being taken offline. If this is the case,
855 * report this to the user, and don't pretend that the
856 * open actually succeeded.
859 if (!scsi_device_online(sdev))
862 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
863 if (scsi_block_when_processing_errors(sdev))
864 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
870 scsi_autopm_put_device(sdev);
877 * sd_release - invoked when the (last) close(2) is called on this
879 * @inode: only i_rdev member may be used
880 * @filp: only f_mode and f_flags may be used
884 * Note: may block (uninterruptible) if error recovery is underway
887 * Locking: called with bdev->bd_mutex held.
889 static int sd_release(struct gendisk *disk, fmode_t mode)
891 struct scsi_disk *sdkp = scsi_disk(disk);
892 struct scsi_device *sdev = sdkp->device;
894 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
896 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
897 if (scsi_block_when_processing_errors(sdev))
898 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
902 * XXX and what if there are packets in flight and this close()
903 * XXX is followed by a "rmmod sd_mod"?
906 scsi_autopm_put_device(sdev);
911 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
913 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
914 struct scsi_device *sdp = sdkp->device;
915 struct Scsi_Host *host = sdp->host;
918 /* default to most commonly used values */
919 diskinfo[0] = 0x40; /* 1 << 6 */
920 diskinfo[1] = 0x20; /* 1 << 5 */
921 diskinfo[2] = sdkp->capacity >> 11;
923 /* override with calculated, extended default, or driver values */
924 if (host->hostt->bios_param)
925 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
927 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
929 geo->heads = diskinfo[0];
930 geo->sectors = diskinfo[1];
931 geo->cylinders = diskinfo[2];
936 * sd_ioctl - process an ioctl
937 * @inode: only i_rdev/i_bdev members may be used
938 * @filp: only f_mode and f_flags may be used
939 * @cmd: ioctl command number
940 * @arg: this is third argument given to ioctl(2) system call.
941 * Often contains a pointer.
943 * Returns 0 if successful (some ioctls return postive numbers on
944 * success as well). Returns a negated errno value in case of error.
946 * Note: most ioctls are forward onto the block subsystem or further
947 * down in the scsi subsystem.
949 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
950 unsigned int cmd, unsigned long arg)
952 struct gendisk *disk = bdev->bd_disk;
953 struct scsi_device *sdp = scsi_disk(disk)->device;
954 void __user *p = (void __user *)arg;
957 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
958 disk->disk_name, cmd));
961 * If we are in the middle of error recovery, don't let anyone
962 * else try and use this device. Also, if error recovery fails, it
963 * may try and take the device offline, in which case all further
964 * access to the device is prohibited.
966 error = scsi_nonblockable_ioctl(sdp, cmd, p,
967 (mode & FMODE_NDELAY) != 0);
968 if (!scsi_block_when_processing_errors(sdp) || !error)
972 * Send SCSI addressing ioctls directly to mid level, send other
973 * ioctls to block level and then onto mid level if they can't be
977 case SCSI_IOCTL_GET_IDLUN:
978 case SCSI_IOCTL_GET_BUS_NUMBER:
979 error = scsi_ioctl(sdp, cmd, p);
982 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
983 if (error != -ENOTTY)
985 error = scsi_ioctl(sdp, cmd, p);
992 static void set_media_not_present(struct scsi_disk *sdkp)
994 if (sdkp->media_present)
995 sdkp->device->changed = 1;
996 sdkp->media_present = 0;
1000 static int media_not_present(struct scsi_disk *sdkp,
1001 struct scsi_sense_hdr *sshdr)
1003 if (!scsi_sense_valid(sshdr))
1006 /* not invoked for commands that could return deferred errors */
1007 switch (sshdr->sense_key) {
1008 case UNIT_ATTENTION:
1009 sdkp->device->changed = 1;
1012 /* medium not present */
1013 if (sshdr->asc == 0x3A) {
1014 set_media_not_present(sdkp);
1022 * sd_check_events - check media events
1023 * @disk: kernel device descriptor
1024 * @clearing: disk events currently being cleared
1026 * Returns mask of DISK_EVENT_*.
1028 * Note: this function is invoked from the block subsystem.
1030 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1032 struct scsi_disk *sdkp = scsi_disk(disk);
1033 struct scsi_device *sdp = sdkp->device;
1034 struct scsi_sense_hdr *sshdr = NULL;
1037 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1040 * If the device is offline, don't send any commands - just pretend as
1041 * if the command failed. If the device ever comes back online, we
1042 * can deal with it then. It is only because of unrecoverable errors
1043 * that we would ever take a device offline in the first place.
1045 if (!scsi_device_online(sdp)) {
1046 set_media_not_present(sdkp);
1051 * Using TEST_UNIT_READY enables differentiation between drive with
1052 * no cartridge loaded - NOT READY, drive with changed cartridge -
1053 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1055 * Drives that auto spin down. eg iomega jaz 1G, will be started
1056 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1057 * sd_revalidate() is called.
1061 if (scsi_block_when_processing_errors(sdp)) {
1062 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1063 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1067 /* failed to execute TUR, assume media not present */
1068 if (host_byte(retval)) {
1069 set_media_not_present(sdkp);
1073 if (media_not_present(sdkp, sshdr))
1077 * For removable scsi disk we have to recognise the presence
1078 * of a disk in the drive.
1080 if (!sdkp->media_present)
1082 sdkp->media_present = 1;
1084 /* for backward compatibility */
1086 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
1089 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1094 static int sd_sync_cache(struct scsi_disk *sdkp)
1097 struct scsi_device *sdp = sdkp->device;
1098 struct scsi_sense_hdr sshdr;
1100 if (!scsi_device_online(sdp))
1104 for (retries = 3; retries > 0; --retries) {
1105 unsigned char cmd[10] = { 0 };
1107 cmd[0] = SYNCHRONIZE_CACHE;
1109 * Leave the rest of the command zero to indicate
1112 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1113 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1119 sd_print_result(sdkp, res);
1120 if (driver_byte(res) & DRIVER_SENSE)
1121 sd_print_sense_hdr(sdkp, &sshdr);
1129 static void sd_rescan(struct device *dev)
1131 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1134 revalidate_disk(sdkp->disk);
1135 scsi_disk_put(sdkp);
1140 #ifdef CONFIG_COMPAT
1142 * This gets directly called from VFS. When the ioctl
1143 * is not recognized we go back to the other translation paths.
1145 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1146 unsigned int cmd, unsigned long arg)
1148 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1151 * If we are in the middle of error recovery, don't let anyone
1152 * else try and use this device. Also, if error recovery fails, it
1153 * may try and take the device offline, in which case all further
1154 * access to the device is prohibited.
1156 if (!scsi_block_when_processing_errors(sdev))
1159 if (sdev->host->hostt->compat_ioctl) {
1162 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1168 * Let the static ioctl translation table take care of it.
1170 return -ENOIOCTLCMD;
1174 static const struct block_device_operations sd_fops = {
1175 .owner = THIS_MODULE,
1177 .release = sd_release,
1179 .getgeo = sd_getgeo,
1180 #ifdef CONFIG_COMPAT
1181 .compat_ioctl = sd_compat_ioctl,
1183 .check_events = sd_check_events,
1184 .revalidate_disk = sd_revalidate_disk,
1185 .unlock_native_capacity = sd_unlock_native_capacity,
1188 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1190 u64 start_lba = blk_rq_pos(scmd->request);
1191 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1195 if (scmd->request->cmd_type != REQ_TYPE_FS)
1198 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1199 SCSI_SENSE_BUFFERSIZE,
1204 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1207 if (scmd->device->sector_size < 512) {
1208 /* only legitimate sector_size here is 256 */
1212 /* be careful ... don't want any overflows */
1213 u64 factor = scmd->device->sector_size / 512;
1214 do_div(start_lba, factor);
1215 do_div(end_lba, factor);
1218 /* The bad lba was reported incorrectly, we have no idea where
1221 if (bad_lba < start_lba || bad_lba >= end_lba)
1224 /* This computation should always be done in terms of
1225 * the resolution of the device's medium.
1227 return (bad_lba - start_lba) * scmd->device->sector_size;
1231 * sd_done - bottom half handler: called when the lower level
1232 * driver has completed (successfully or otherwise) a scsi command.
1233 * @SCpnt: mid-level's per command structure.
1235 * Note: potentially run from within an ISR. Must not block.
1237 static int sd_done(struct scsi_cmnd *SCpnt)
1239 int result = SCpnt->result;
1240 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1241 struct scsi_sense_hdr sshdr;
1242 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1243 int sense_valid = 0;
1244 int sense_deferred = 0;
1246 if (SCpnt->request->cmd_flags & REQ_DISCARD) {
1248 scsi_set_resid(SCpnt, 0);
1253 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1255 sense_deferred = scsi_sense_is_deferred(&sshdr);
1257 #ifdef CONFIG_SCSI_LOGGING
1258 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1260 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1261 "sd_done: sb[respc,sk,asc,"
1262 "ascq]=%x,%x,%x,%x\n",
1263 sshdr.response_code,
1264 sshdr.sense_key, sshdr.asc,
1268 if (driver_byte(result) != DRIVER_SENSE &&
1269 (!sense_valid || sense_deferred))
1272 switch (sshdr.sense_key) {
1273 case HARDWARE_ERROR:
1275 good_bytes = sd_completed_bytes(SCpnt);
1277 case RECOVERED_ERROR:
1278 good_bytes = scsi_bufflen(SCpnt);
1281 /* This indicates a false check condition, so ignore it. An
1282 * unknown amount of data was transferred so treat it as an
1285 scsi_print_sense("sd", SCpnt);
1287 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1289 case ABORTED_COMMAND: /* DIF: Target detected corruption */
1290 case ILLEGAL_REQUEST: /* DIX: Host detected corruption */
1291 if (sshdr.asc == 0x10)
1292 good_bytes = sd_completed_bytes(SCpnt);
1298 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1299 sd_dif_complete(SCpnt, good_bytes);
1301 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1302 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1304 /* We have to print a failed command here as the
1305 * extended CDB gets freed before scsi_io_completion()
1309 scsi_print_command(SCpnt);
1311 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1320 * spinup disk - called only in sd_revalidate_disk()
1323 sd_spinup_disk(struct scsi_disk *sdkp)
1325 unsigned char cmd[10];
1326 unsigned long spintime_expire = 0;
1327 int retries, spintime;
1328 unsigned int the_result;
1329 struct scsi_sense_hdr sshdr;
1330 int sense_valid = 0;
1334 /* Spin up drives, as required. Only do this at boot time */
1335 /* Spinup needs to be done for module loads too. */
1340 cmd[0] = TEST_UNIT_READY;
1341 memset((void *) &cmd[1], 0, 9);
1343 the_result = scsi_execute_req(sdkp->device, cmd,
1346 SD_MAX_RETRIES, NULL);
1349 * If the drive has indicated to us that it
1350 * doesn't have any media in it, don't bother
1351 * with any more polling.
1353 if (media_not_present(sdkp, &sshdr))
1357 sense_valid = scsi_sense_valid(&sshdr);
1359 } while (retries < 3 &&
1360 (!scsi_status_is_good(the_result) ||
1361 ((driver_byte(the_result) & DRIVER_SENSE) &&
1362 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1364 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1365 /* no sense, TUR either succeeded or failed
1366 * with a status error */
1367 if(!spintime && !scsi_status_is_good(the_result)) {
1368 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1369 sd_print_result(sdkp, the_result);
1375 * The device does not want the automatic start to be issued.
1377 if (sdkp->device->no_start_on_add)
1380 if (sense_valid && sshdr.sense_key == NOT_READY) {
1381 if (sshdr.asc == 4 && sshdr.ascq == 3)
1382 break; /* manual intervention required */
1383 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1384 break; /* standby */
1385 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1386 break; /* unavailable */
1388 * Issue command to spin up drive when not ready
1391 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1392 cmd[0] = START_STOP;
1393 cmd[1] = 1; /* Return immediately */
1394 memset((void *) &cmd[2], 0, 8);
1395 cmd[4] = 1; /* Start spin cycle */
1396 if (sdkp->device->start_stop_pwr_cond)
1398 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1400 SD_TIMEOUT, SD_MAX_RETRIES,
1402 spintime_expire = jiffies + 100 * HZ;
1405 /* Wait 1 second for next try */
1410 * Wait for USB flash devices with slow firmware.
1411 * Yes, this sense key/ASC combination shouldn't
1412 * occur here. It's characteristic of these devices.
1414 } else if (sense_valid &&
1415 sshdr.sense_key == UNIT_ATTENTION &&
1416 sshdr.asc == 0x28) {
1418 spintime_expire = jiffies + 5 * HZ;
1421 /* Wait 1 second for next try */
1424 /* we don't understand the sense code, so it's
1425 * probably pointless to loop */
1427 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1428 sd_print_sense_hdr(sdkp, &sshdr);
1433 } while (spintime && time_before_eq(jiffies, spintime_expire));
1436 if (scsi_status_is_good(the_result))
1439 printk("not responding...\n");
1445 * Determine whether disk supports Data Integrity Field.
1447 static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1449 struct scsi_device *sdp = sdkp->device;
1452 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1455 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1457 if (type == sdkp->protection_type || !sdkp->first_scan)
1460 sdkp->protection_type = type;
1462 if (type > SD_DIF_TYPE3_PROTECTION) {
1463 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1464 "protection type %u. Disabling disk!\n", type);
1469 if (scsi_host_dif_capable(sdp->host, type))
1470 sd_printk(KERN_NOTICE, sdkp,
1471 "Enabling DIF Type %u protection\n", type);
1473 sd_printk(KERN_NOTICE, sdkp,
1474 "Disabling DIF Type %u protection\n", type);
1477 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1478 struct scsi_sense_hdr *sshdr, int sense_valid,
1481 sd_print_result(sdkp, the_result);
1482 if (driver_byte(the_result) & DRIVER_SENSE)
1483 sd_print_sense_hdr(sdkp, sshdr);
1485 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1488 * Set dirty bit for removable devices if not ready -
1489 * sometimes drives will not report this properly.
1491 if (sdp->removable &&
1492 sense_valid && sshdr->sense_key == NOT_READY)
1493 set_media_not_present(sdkp);
1496 * We used to set media_present to 0 here to indicate no media
1497 * in the drive, but some drives fail read capacity even with
1498 * media present, so we can't do that.
1500 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1504 #if RC16_LEN > SD_BUF_SIZE
1505 #error RC16_LEN must not be more than SD_BUF_SIZE
1508 #define READ_CAPACITY_RETRIES_ON_RESET 10
1510 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1511 unsigned char *buffer)
1513 unsigned char cmd[16];
1514 struct scsi_sense_hdr sshdr;
1515 int sense_valid = 0;
1517 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1518 unsigned int alignment;
1519 unsigned long long lba;
1520 unsigned sector_size;
1522 if (sdp->no_read_capacity_16)
1527 cmd[0] = SERVICE_ACTION_IN;
1528 cmd[1] = SAI_READ_CAPACITY_16;
1530 memset(buffer, 0, RC16_LEN);
1532 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1533 buffer, RC16_LEN, &sshdr,
1534 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1536 if (media_not_present(sdkp, &sshdr))
1540 sense_valid = scsi_sense_valid(&sshdr);
1542 sshdr.sense_key == ILLEGAL_REQUEST &&
1543 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1545 /* Invalid Command Operation Code or
1546 * Invalid Field in CDB, just retry
1547 * silently with RC10 */
1550 sshdr.sense_key == UNIT_ATTENTION &&
1551 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1552 /* Device reset might occur several times,
1553 * give it one more chance */
1554 if (--reset_retries > 0)
1559 } while (the_result && retries);
1562 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1563 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1567 sector_size = get_unaligned_be32(&buffer[8]);
1568 lba = get_unaligned_be64(&buffer[0]);
1570 sd_read_protection_type(sdkp, buffer);
1572 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1573 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1574 "kernel compiled with support for large block "
1580 /* Logical blocks per physical block exponent */
1581 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1583 /* Lowest aligned logical block */
1584 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1585 blk_queue_alignment_offset(sdp->request_queue, alignment);
1586 if (alignment && sdkp->first_scan)
1587 sd_printk(KERN_NOTICE, sdkp,
1588 "physical block alignment offset: %u\n", alignment);
1590 if (buffer[14] & 0x80) { /* TPE */
1591 struct request_queue *q = sdp->request_queue;
1593 sdkp->thin_provisioning = 1;
1594 q->limits.discard_granularity = sdkp->physical_block_size;
1595 q->limits.max_discard_sectors = 0xffffffff;
1597 if (buffer[14] & 0x40) /* TPRZ */
1598 q->limits.discard_zeroes_data = 1;
1600 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1603 sdkp->capacity = lba + 1;
1607 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1608 unsigned char *buffer)
1610 unsigned char cmd[16];
1611 struct scsi_sense_hdr sshdr;
1612 int sense_valid = 0;
1614 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1616 unsigned sector_size;
1619 cmd[0] = READ_CAPACITY;
1620 memset(&cmd[1], 0, 9);
1621 memset(buffer, 0, 8);
1623 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1625 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1627 if (media_not_present(sdkp, &sshdr))
1631 sense_valid = scsi_sense_valid(&sshdr);
1633 sshdr.sense_key == UNIT_ATTENTION &&
1634 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1635 /* Device reset might occur several times,
1636 * give it one more chance */
1637 if (--reset_retries > 0)
1642 } while (the_result && retries);
1645 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1646 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1650 sector_size = get_unaligned_be32(&buffer[4]);
1651 lba = get_unaligned_be32(&buffer[0]);
1653 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1654 /* Some buggy (usb cardreader) devices return an lba of
1655 0xffffffff when the want to report a size of 0 (with
1656 which they really mean no media is present) */
1658 sdkp->physical_block_size = sector_size;
1662 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1663 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1664 "kernel compiled with support for large block "
1670 sdkp->capacity = lba + 1;
1671 sdkp->physical_block_size = sector_size;
1675 static int sd_try_rc16_first(struct scsi_device *sdp)
1677 if (sdp->host->max_cmd_len < 16)
1679 if (sdp->scsi_level > SCSI_SPC_2)
1681 if (scsi_device_protection(sdp))
1687 * read disk capacity
1690 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1693 struct scsi_device *sdp = sdkp->device;
1694 sector_t old_capacity = sdkp->capacity;
1696 if (sd_try_rc16_first(sdp)) {
1697 sector_size = read_capacity_16(sdkp, sdp, buffer);
1698 if (sector_size == -EOVERFLOW)
1700 if (sector_size == -ENODEV)
1702 if (sector_size < 0)
1703 sector_size = read_capacity_10(sdkp, sdp, buffer);
1704 if (sector_size < 0)
1707 sector_size = read_capacity_10(sdkp, sdp, buffer);
1708 if (sector_size == -EOVERFLOW)
1710 if (sector_size < 0)
1712 if ((sizeof(sdkp->capacity) > 4) &&
1713 (sdkp->capacity > 0xffffffffULL)) {
1714 int old_sector_size = sector_size;
1715 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1716 "Trying to use READ CAPACITY(16).\n");
1717 sector_size = read_capacity_16(sdkp, sdp, buffer);
1718 if (sector_size < 0) {
1719 sd_printk(KERN_NOTICE, sdkp,
1720 "Using 0xffffffff as device size\n");
1721 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1722 sector_size = old_sector_size;
1728 /* Some devices are known to return the total number of blocks,
1729 * not the highest block number. Some devices have versions
1730 * which do this and others which do not. Some devices we might
1731 * suspect of doing this but we don't know for certain.
1733 * If we know the reported capacity is wrong, decrement it. If
1734 * we can only guess, then assume the number of blocks is even
1735 * (usually true but not always) and err on the side of lowering
1738 if (sdp->fix_capacity ||
1739 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1740 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1741 "from its reported value: %llu\n",
1742 (unsigned long long) sdkp->capacity);
1747 if (sector_size == 0) {
1749 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1753 if (sector_size != 512 &&
1754 sector_size != 1024 &&
1755 sector_size != 2048 &&
1756 sector_size != 4096 &&
1757 sector_size != 256) {
1758 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1761 * The user might want to re-format the drive with
1762 * a supported sectorsize. Once this happens, it
1763 * would be relatively trivial to set the thing up.
1764 * For this reason, we leave the thing in the table.
1768 * set a bogus sector size so the normal read/write
1769 * logic in the block layer will eventually refuse any
1770 * request on this device without tripping over power
1771 * of two sector size assumptions
1775 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1778 char cap_str_2[10], cap_str_10[10];
1779 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1781 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1783 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1784 sizeof(cap_str_10));
1786 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1787 sd_printk(KERN_NOTICE, sdkp,
1788 "%llu %d-byte logical blocks: (%s/%s)\n",
1789 (unsigned long long)sdkp->capacity,
1790 sector_size, cap_str_10, cap_str_2);
1792 if (sdkp->physical_block_size != sector_size)
1793 sd_printk(KERN_NOTICE, sdkp,
1794 "%u-byte physical blocks\n",
1795 sdkp->physical_block_size);
1799 /* Rescale capacity to 512-byte units */
1800 if (sector_size == 4096)
1801 sdkp->capacity <<= 3;
1802 else if (sector_size == 2048)
1803 sdkp->capacity <<= 2;
1804 else if (sector_size == 1024)
1805 sdkp->capacity <<= 1;
1806 else if (sector_size == 256)
1807 sdkp->capacity >>= 1;
1809 blk_queue_physical_block_size(sdp->request_queue,
1810 sdkp->physical_block_size);
1811 sdkp->device->sector_size = sector_size;
1814 /* called with buffer of length 512 */
1816 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1817 unsigned char *buffer, int len, struct scsi_mode_data *data,
1818 struct scsi_sense_hdr *sshdr)
1820 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1821 SD_TIMEOUT, SD_MAX_RETRIES, data,
1826 * read write protect setting, if possible - called only in sd_revalidate_disk()
1827 * called with buffer of length SD_BUF_SIZE
1830 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1833 struct scsi_device *sdp = sdkp->device;
1834 struct scsi_mode_data data;
1835 int old_wp = sdkp->write_prot;
1837 set_disk_ro(sdkp->disk, 0);
1838 if (sdp->skip_ms_page_3f) {
1839 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1843 if (sdp->use_192_bytes_for_3f) {
1844 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1847 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1848 * We have to start carefully: some devices hang if we ask
1849 * for more than is available.
1851 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1854 * Second attempt: ask for page 0 When only page 0 is
1855 * implemented, a request for page 3F may return Sense Key
1856 * 5: Illegal Request, Sense Code 24: Invalid field in
1859 if (!scsi_status_is_good(res))
1860 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1863 * Third attempt: ask 255 bytes, as we did earlier.
1865 if (!scsi_status_is_good(res))
1866 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1870 if (!scsi_status_is_good(res)) {
1871 sd_printk(KERN_WARNING, sdkp,
1872 "Test WP failed, assume Write Enabled\n");
1874 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1875 set_disk_ro(sdkp->disk, sdkp->write_prot);
1876 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1877 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1878 sdkp->write_prot ? "on" : "off");
1879 sd_printk(KERN_DEBUG, sdkp,
1880 "Mode Sense: %02x %02x %02x %02x\n",
1881 buffer[0], buffer[1], buffer[2], buffer[3]);
1887 * sd_read_cache_type - called only from sd_revalidate_disk()
1888 * called with buffer of length SD_BUF_SIZE
1891 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1894 struct scsi_device *sdp = sdkp->device;
1898 struct scsi_mode_data data;
1899 struct scsi_sense_hdr sshdr;
1900 int old_wce = sdkp->WCE;
1901 int old_rcd = sdkp->RCD;
1902 int old_dpofua = sdkp->DPOFUA;
1904 if (sdp->skip_ms_page_8)
1907 if (sdp->type == TYPE_RBC) {
1915 /* cautiously ask */
1916 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1918 if (!scsi_status_is_good(res))
1921 if (!data.header_length) {
1923 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1926 /* that went OK, now ask for the proper length */
1930 * We're only interested in the first three bytes, actually.
1931 * But the data cache page is defined for the first 20.
1938 /* Take headers and block descriptors into account */
1939 len += data.header_length + data.block_descriptor_length;
1940 if (len > SD_BUF_SIZE)
1944 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1946 if (scsi_status_is_good(res)) {
1947 int offset = data.header_length + data.block_descriptor_length;
1949 if (offset >= SD_BUF_SIZE - 2) {
1950 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1954 if ((buffer[offset] & 0x3f) != modepage) {
1955 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1959 if (modepage == 8) {
1960 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1961 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1963 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1967 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1968 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1969 sd_printk(KERN_NOTICE, sdkp,
1970 "Uses READ/WRITE(6), disabling FUA\n");
1974 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1975 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1976 sd_printk(KERN_NOTICE, sdkp,
1977 "Write cache: %s, read cache: %s, %s\n",
1978 sdkp->WCE ? "enabled" : "disabled",
1979 sdkp->RCD ? "disabled" : "enabled",
1980 sdkp->DPOFUA ? "supports DPO and FUA"
1981 : "doesn't support DPO or FUA");
1987 if (scsi_sense_valid(&sshdr) &&
1988 sshdr.sense_key == ILLEGAL_REQUEST &&
1989 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1990 /* Invalid field in CDB */
1991 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1993 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1996 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2003 * The ATO bit indicates whether the DIF application tag is available
2004 * for use by the operating system.
2006 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2009 struct scsi_device *sdp = sdkp->device;
2010 struct scsi_mode_data data;
2011 struct scsi_sense_hdr sshdr;
2013 if (sdp->type != TYPE_DISK)
2016 if (sdkp->protection_type == 0)
2019 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2020 SD_MAX_RETRIES, &data, &sshdr);
2022 if (!scsi_status_is_good(res) || !data.header_length ||
2024 sd_printk(KERN_WARNING, sdkp,
2025 "getting Control mode page failed, assume no ATO\n");
2027 if (scsi_sense_valid(&sshdr))
2028 sd_print_sense_hdr(sdkp, &sshdr);
2033 offset = data.header_length + data.block_descriptor_length;
2035 if ((buffer[offset] & 0x3f) != 0x0a) {
2036 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2040 if ((buffer[offset + 5] & 0x80) == 0)
2049 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2050 * @disk: disk to query
2052 static void sd_read_block_limits(struct scsi_disk *sdkp)
2054 struct request_queue *q = sdkp->disk->queue;
2055 unsigned int sector_sz = sdkp->device->sector_size;
2056 const int vpd_len = 64;
2057 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2060 /* Block Limits VPD */
2061 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2064 blk_queue_io_min(sdkp->disk->queue,
2065 get_unaligned_be16(&buffer[6]) * sector_sz);
2066 blk_queue_io_opt(sdkp->disk->queue,
2067 get_unaligned_be32(&buffer[12]) * sector_sz);
2069 /* Thin provisioning enabled and page length indicates TP support */
2070 if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
2071 unsigned int lba_count, desc_count, granularity;
2073 lba_count = get_unaligned_be32(&buffer[20]);
2074 desc_count = get_unaligned_be32(&buffer[24]);
2076 if (lba_count && desc_count) {
2077 if (sdkp->tpvpd && !sdkp->tpu)
2083 if (sdkp->tpvpd && !sdkp->tpu && !sdkp->tpws) {
2084 sd_printk(KERN_ERR, sdkp, "Thin provisioning is " \
2085 "enabled but neither TPU, nor TPWS are " \
2086 "set. Disabling discard!\n");
2091 q->limits.max_discard_sectors =
2092 lba_count * sector_sz >> 9;
2094 granularity = get_unaligned_be32(&buffer[28]);
2097 q->limits.discard_granularity = granularity * sector_sz;
2099 if (buffer[32] & 0x80)
2100 q->limits.discard_alignment =
2101 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2109 * sd_read_block_characteristics - Query block dev. characteristics
2110 * @disk: disk to query
2112 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2114 unsigned char *buffer;
2116 const int vpd_len = 64;
2118 buffer = kmalloc(vpd_len, GFP_KERNEL);
2121 /* Block Device Characteristics VPD */
2122 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2125 rot = get_unaligned_be16(&buffer[4]);
2128 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2135 * sd_read_thin_provisioning - Query thin provisioning VPD page
2136 * @disk: disk to query
2138 static void sd_read_thin_provisioning(struct scsi_disk *sdkp)
2140 unsigned char *buffer;
2141 const int vpd_len = 8;
2143 if (sdkp->thin_provisioning == 0)
2146 buffer = kmalloc(vpd_len, GFP_KERNEL);
2148 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2152 sdkp->tpu = (buffer[5] >> 7) & 1; /* UNMAP */
2153 sdkp->tpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2159 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2162 * Although VPD inquiries can go to SCSI-2 type devices,
2163 * some USB ones crash on receiving them, and the pages
2164 * we currently ask for are for SPC-3 and beyond
2166 if (sdp->scsi_level > SCSI_SPC_2)
2172 * sd_revalidate_disk - called the first time a new disk is seen,
2173 * performs disk spin up, read_capacity, etc.
2174 * @disk: struct gendisk we care about
2176 static int sd_revalidate_disk(struct gendisk *disk)
2178 struct scsi_disk *sdkp = scsi_disk(disk);
2179 struct scsi_device *sdp = sdkp->device;
2180 unsigned char *buffer;
2183 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2184 "sd_revalidate_disk\n"));
2187 * If the device is offline, don't try and read capacity or any
2188 * of the other niceties.
2190 if (!scsi_device_online(sdp))
2193 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2195 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2196 "allocation failure.\n");
2200 sd_spinup_disk(sdkp);
2203 * Without media there is no reason to ask; moreover, some devices
2204 * react badly if we do.
2206 if (sdkp->media_present) {
2207 sd_read_capacity(sdkp, buffer);
2209 if (sd_try_extended_inquiry(sdp)) {
2210 sd_read_thin_provisioning(sdkp);
2211 sd_read_block_limits(sdkp);
2212 sd_read_block_characteristics(sdkp);
2215 sd_read_write_protect_flag(sdkp, buffer);
2216 sd_read_cache_type(sdkp, buffer);
2217 sd_read_app_tag_own(sdkp, buffer);
2220 sdkp->first_scan = 0;
2223 * We now have all cache related info, determine how we deal
2224 * with flush requests.
2232 blk_queue_flush(sdkp->disk->queue, flush);
2234 set_capacity(disk, sdkp->capacity);
2242 * sd_unlock_native_capacity - unlock native capacity
2243 * @disk: struct gendisk to set capacity for
2245 * Block layer calls this function if it detects that partitions
2246 * on @disk reach beyond the end of the device. If the SCSI host
2247 * implements ->unlock_native_capacity() method, it's invoked to
2248 * give it a chance to adjust the device capacity.
2251 * Defined by block layer. Might sleep.
2253 static void sd_unlock_native_capacity(struct gendisk *disk)
2255 struct scsi_device *sdev = scsi_disk(disk)->device;
2257 if (sdev->host->hostt->unlock_native_capacity)
2258 sdev->host->hostt->unlock_native_capacity(sdev);
2262 * sd_format_disk_name - format disk name
2263 * @prefix: name prefix - ie. "sd" for SCSI disks
2264 * @index: index of the disk to format name for
2265 * @buf: output buffer
2266 * @buflen: length of the output buffer
2268 * SCSI disk names starts at sda. The 26th device is sdz and the
2269 * 27th is sdaa. The last one for two lettered suffix is sdzz
2270 * which is followed by sdaaa.
2272 * This is basically 26 base counting with one extra 'nil' entry
2273 * at the beginning from the second digit on and can be
2274 * determined using similar method as 26 base conversion with the
2275 * index shifted -1 after each digit is computed.
2281 * 0 on success, -errno on failure.
2283 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2285 const int base = 'z' - 'a' + 1;
2286 char *begin = buf + strlen(prefix);
2287 char *end = buf + buflen;
2297 *--p = 'a' + (index % unit);
2298 index = (index / unit) - 1;
2299 } while (index >= 0);
2301 memmove(begin, p, end - p);
2302 memcpy(buf, prefix, strlen(prefix));
2308 * The asynchronous part of sd_probe
2310 static void sd_probe_async(void *data, async_cookie_t cookie)
2312 struct scsi_disk *sdkp = data;
2313 struct scsi_device *sdp;
2320 index = sdkp->index;
2321 dev = &sdp->sdev_gendev;
2323 gd->major = sd_major((index & 0xf0) >> 4);
2324 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2325 gd->minors = SD_MINORS;
2327 gd->fops = &sd_fops;
2328 gd->private_data = &sdkp->driver;
2329 gd->queue = sdkp->device->request_queue;
2331 /* defaults, until the device tells us otherwise */
2332 sdp->sector_size = 512;
2334 sdkp->media_present = 1;
2335 sdkp->write_prot = 0;
2339 sdkp->first_scan = 1;
2341 sd_revalidate_disk(gd);
2343 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2344 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2346 gd->driverfs_dev = &sdp->sdev_gendev;
2347 gd->flags = GENHD_FL_EXT_DEVT;
2348 if (sdp->removable) {
2349 gd->flags |= GENHD_FL_REMOVABLE;
2350 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2354 sd_dif_config_host(sdkp);
2356 sd_revalidate_disk(gd);
2358 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2359 sdp->removable ? "removable " : "");
2360 scsi_autopm_put_device(sdp);
2361 put_device(&sdkp->dev);
2365 * sd_probe - called during driver initialization and whenever a
2366 * new scsi device is attached to the system. It is called once
2367 * for each scsi device (not just disks) present.
2368 * @dev: pointer to device object
2370 * Returns 0 if successful (or not interested in this scsi device
2371 * (e.g. scanner)); 1 when there is an error.
2373 * Note: this function is invoked from the scsi mid-level.
2374 * This function sets up the mapping between a given
2375 * <host,channel,id,lun> (found in sdp) and new device name
2376 * (e.g. /dev/sda). More precisely it is the block device major
2377 * and minor number that is chosen here.
2379 * Assume sd_attach is not re-entrant (for time being)
2380 * Also think about sd_attach() and sd_remove() running coincidentally.
2382 static int sd_probe(struct device *dev)
2384 struct scsi_device *sdp = to_scsi_device(dev);
2385 struct scsi_disk *sdkp;
2391 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2394 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2398 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2402 gd = alloc_disk(SD_MINORS);
2407 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2410 spin_lock(&sd_index_lock);
2411 error = ida_get_new(&sd_index_ida, &index);
2412 spin_unlock(&sd_index_lock);
2413 } while (error == -EAGAIN);
2418 if (index >= SD_MAX_DISKS) {
2420 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name space exhausted.\n");
2421 goto out_free_index;
2424 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2426 goto out_free_index;
2429 sdkp->driver = &sd_template;
2431 sdkp->index = index;
2432 atomic_set(&sdkp->openers, 0);
2434 if (!sdp->request_queue->rq_timeout) {
2435 if (sdp->type != TYPE_MOD)
2436 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2438 blk_queue_rq_timeout(sdp->request_queue,
2442 device_initialize(&sdkp->dev);
2443 sdkp->dev.parent = dev;
2444 sdkp->dev.class = &sd_disk_class;
2445 dev_set_name(&sdkp->dev, dev_name(dev));
2447 if (device_add(&sdkp->dev))
2448 goto out_free_index;
2451 dev_set_drvdata(dev, sdkp);
2453 get_device(&sdkp->dev); /* prevent release before async_schedule */
2454 async_schedule(sd_probe_async, sdkp);
2459 spin_lock(&sd_index_lock);
2460 ida_remove(&sd_index_ida, index);
2461 spin_unlock(&sd_index_lock);
2471 * sd_remove - called whenever a scsi disk (previously recognized by
2472 * sd_probe) is detached from the system. It is called (potentially
2473 * multiple times) during sd module unload.
2474 * @sdp: pointer to mid level scsi device object
2476 * Note: this function is invoked from the scsi mid-level.
2477 * This function potentially frees up a device name (e.g. /dev/sdc)
2478 * that could be re-used by a subsequent sd_probe().
2479 * This function is not called when the built-in sd driver is "exit-ed".
2481 static int sd_remove(struct device *dev)
2483 struct scsi_disk *sdkp;
2485 sdkp = dev_get_drvdata(dev);
2486 scsi_autopm_get_device(sdkp->device);
2488 async_synchronize_full();
2489 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2490 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2491 device_del(&sdkp->dev);
2492 del_gendisk(sdkp->disk);
2495 mutex_lock(&sd_ref_mutex);
2496 dev_set_drvdata(dev, NULL);
2497 put_device(&sdkp->dev);
2498 mutex_unlock(&sd_ref_mutex);
2504 * scsi_disk_release - Called to free the scsi_disk structure
2505 * @dev: pointer to embedded class device
2507 * sd_ref_mutex must be held entering this routine. Because it is
2508 * called on last put, you should always use the scsi_disk_get()
2509 * scsi_disk_put() helpers which manipulate the semaphore directly
2510 * and never do a direct put_device.
2512 static void scsi_disk_release(struct device *dev)
2514 struct scsi_disk *sdkp = to_scsi_disk(dev);
2515 struct gendisk *disk = sdkp->disk;
2517 spin_lock(&sd_index_lock);
2518 ida_remove(&sd_index_ida, sdkp->index);
2519 spin_unlock(&sd_index_lock);
2521 disk->private_data = NULL;
2523 put_device(&sdkp->device->sdev_gendev);
2528 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2530 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2531 struct scsi_sense_hdr sshdr;
2532 struct scsi_device *sdp = sdkp->device;
2536 cmd[4] |= 1; /* START */
2538 if (sdp->start_stop_pwr_cond)
2539 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2541 if (!scsi_device_online(sdp))
2544 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2545 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2547 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2548 sd_print_result(sdkp, res);
2549 if (driver_byte(res) & DRIVER_SENSE)
2550 sd_print_sense_hdr(sdkp, &sshdr);
2557 * Send a SYNCHRONIZE CACHE instruction down to the device through
2558 * the normal SCSI command structure. Wait for the command to
2561 static void sd_shutdown(struct device *dev)
2563 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2566 return; /* this can happen */
2569 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2570 sd_sync_cache(sdkp);
2573 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2574 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2575 sd_start_stop_device(sdkp, 0);
2578 scsi_disk_put(sdkp);
2581 static int sd_suspend(struct device *dev, pm_message_t mesg)
2583 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2587 return 0; /* this can happen */
2590 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2591 ret = sd_sync_cache(sdkp);
2596 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2597 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2598 ret = sd_start_stop_device(sdkp, 0);
2602 scsi_disk_put(sdkp);
2606 static int sd_resume(struct device *dev)
2608 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2611 if (!sdkp->device->manage_start_stop)
2614 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2615 ret = sd_start_stop_device(sdkp, 1);
2618 scsi_disk_put(sdkp);
2623 * init_sd - entry point for this driver (both when built in or when
2626 * Note: this function registers this driver with the scsi mid-level.
2628 static int __init init_sd(void)
2630 int majors = 0, i, err;
2632 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2634 for (i = 0; i < SD_MAJORS; i++)
2635 if (register_blkdev(sd_major(i), "sd") == 0)
2641 err = class_register(&sd_disk_class);
2645 err = scsi_register_driver(&sd_template.gendrv);
2649 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2651 if (!sd_cdb_cache) {
2652 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2656 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2658 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2665 kmem_cache_destroy(sd_cdb_cache);
2668 class_unregister(&sd_disk_class);
2670 for (i = 0; i < SD_MAJORS; i++)
2671 unregister_blkdev(sd_major(i), "sd");
2676 * exit_sd - exit point for this driver (when it is a module).
2678 * Note: this function unregisters this driver from the scsi mid-level.
2680 static void __exit exit_sd(void)
2684 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2686 mempool_destroy(sd_cdb_pool);
2687 kmem_cache_destroy(sd_cdb_cache);
2689 scsi_unregister_driver(&sd_template.gendrv);
2690 class_unregister(&sd_disk_class);
2692 for (i = 0; i < SD_MAJORS; i++)
2693 unregister_blkdev(sd_major(i), "sd");
2696 module_init(init_sd);
2697 module_exit(exit_sd);
2699 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2700 struct scsi_sense_hdr *sshdr)
2702 sd_printk(KERN_INFO, sdkp, " ");
2703 scsi_show_sense_hdr(sshdr);
2704 sd_printk(KERN_INFO, sdkp, " ");
2705 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2708 static void sd_print_result(struct scsi_disk *sdkp, int result)
2710 sd_printk(KERN_INFO, sdkp, " ");
2711 scsi_show_result(result);