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 <asm/uaccess.h>
52 #include <scsi/scsi.h>
53 #include <scsi/scsi_cmnd.h>
54 #include <scsi/scsi_dbg.h>
55 #include <scsi/scsi_device.h>
56 #include <scsi/scsi_driver.h>
57 #include <scsi/scsi_eh.h>
58 #include <scsi/scsi_host.h>
59 #include <scsi/scsi_ioctl.h>
60 #include <scsi/scsicam.h>
63 #include "scsi_logging.h"
65 MODULE_AUTHOR("Eric Youngdale");
66 MODULE_DESCRIPTION("SCSI disk (sd) driver");
67 MODULE_LICENSE("GPL");
69 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
70 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
85 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
86 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
87 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
91 #define SD_EXT_MINORS (SD_PARTS - SD_MINORS)
93 static int sd_revalidate_disk(struct gendisk *);
94 static int sd_probe(struct device *);
95 static int sd_remove(struct device *);
96 static void sd_shutdown(struct device *);
97 static int sd_suspend(struct device *, pm_message_t state);
98 static int sd_resume(struct device *);
99 static void sd_rescan(struct device *);
100 static int sd_done(struct scsi_cmnd *);
101 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
102 static void scsi_disk_release(struct device *cdev);
103 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
104 static void sd_print_result(struct scsi_disk *, int);
106 static DEFINE_IDA(sd_index_ida);
108 /* This semaphore is used to mediate the 0->1 reference get in the
109 * face of object destruction (i.e. we can't allow a get on an
110 * object after last put) */
111 static DEFINE_MUTEX(sd_ref_mutex);
113 static const char *sd_cache_types[] = {
114 "write through", "none", "write back",
115 "write back, no read (daft)"
119 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
120 const char *buf, size_t count)
122 int i, ct = -1, rcd, wce, sp;
123 struct scsi_disk *sdkp = to_scsi_disk(dev);
124 struct scsi_device *sdp = sdkp->device;
127 struct scsi_mode_data data;
128 struct scsi_sense_hdr sshdr;
131 if (sdp->type != TYPE_DISK)
132 /* no cache control on RBC devices; theoretically they
133 * can do it, but there's probably so many exceptions
134 * it's not worth the risk */
137 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
138 const int len = strlen(sd_cache_types[i]);
139 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
147 rcd = ct & 0x01 ? 1 : 0;
148 wce = ct & 0x02 ? 1 : 0;
149 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
150 SD_MAX_RETRIES, &data, NULL))
152 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
153 data.block_descriptor_length);
154 buffer_data = buffer + data.header_length +
155 data.block_descriptor_length;
156 buffer_data[2] &= ~0x05;
157 buffer_data[2] |= wce << 2 | rcd;
158 sp = buffer_data[0] & 0x80 ? 1 : 0;
160 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
161 SD_MAX_RETRIES, &data, &sshdr)) {
162 if (scsi_sense_valid(&sshdr))
163 sd_print_sense_hdr(sdkp, &sshdr);
166 sd_revalidate_disk(sdkp->disk);
171 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
172 const char *buf, size_t count)
174 struct scsi_disk *sdkp = to_scsi_disk(dev);
175 struct scsi_device *sdp = sdkp->device;
177 if (!capable(CAP_SYS_ADMIN))
180 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
186 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
187 const char *buf, size_t count)
189 struct scsi_disk *sdkp = to_scsi_disk(dev);
190 struct scsi_device *sdp = sdkp->device;
192 if (!capable(CAP_SYS_ADMIN))
195 if (sdp->type != TYPE_DISK)
198 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
204 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
207 struct scsi_disk *sdkp = to_scsi_disk(dev);
208 int ct = sdkp->RCD + 2*sdkp->WCE;
210 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
214 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
216 struct scsi_disk *sdkp = to_scsi_disk(dev);
218 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
222 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
225 struct scsi_disk *sdkp = to_scsi_disk(dev);
226 struct scsi_device *sdp = sdkp->device;
228 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
232 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
235 struct scsi_disk *sdkp = to_scsi_disk(dev);
237 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
241 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
244 struct scsi_disk *sdkp = to_scsi_disk(dev);
246 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
250 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
253 struct scsi_disk *sdkp = to_scsi_disk(dev);
255 return snprintf(buf, 20, "%u\n", sdkp->ATO);
258 static struct device_attribute sd_disk_attrs[] = {
259 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
260 sd_store_cache_type),
261 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
262 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
263 sd_store_allow_restart),
264 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
265 sd_store_manage_start_stop),
266 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
267 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
271 static struct class sd_disk_class = {
273 .owner = THIS_MODULE,
274 .dev_release = scsi_disk_release,
275 .dev_attrs = sd_disk_attrs,
278 static struct scsi_driver sd_template = {
279 .owner = THIS_MODULE,
284 .suspend = sd_suspend,
286 .shutdown = sd_shutdown,
293 * Device no to disk mapping:
295 * major disc2 disc p1
296 * |............|.............|....|....| <- dev_t
299 * Inside a major, we have 16k disks, however mapped non-
300 * contiguously. The first 16 disks are for major0, the next
301 * ones with major1, ... Disk 256 is for major0 again, disk 272
303 * As we stay compatible with our numbering scheme, we can reuse
304 * the well-know SCSI majors 8, 65--71, 136--143.
306 static int sd_major(int major_idx)
310 return SCSI_DISK0_MAJOR;
312 return SCSI_DISK1_MAJOR + major_idx - 1;
314 return SCSI_DISK8_MAJOR + major_idx - 8;
317 return 0; /* shut up gcc */
321 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
323 struct scsi_disk *sdkp = NULL;
325 if (disk->private_data) {
326 sdkp = scsi_disk(disk);
327 if (scsi_device_get(sdkp->device) == 0)
328 get_device(&sdkp->dev);
335 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
337 struct scsi_disk *sdkp;
339 mutex_lock(&sd_ref_mutex);
340 sdkp = __scsi_disk_get(disk);
341 mutex_unlock(&sd_ref_mutex);
345 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
347 struct scsi_disk *sdkp;
349 mutex_lock(&sd_ref_mutex);
350 sdkp = dev_get_drvdata(dev);
352 sdkp = __scsi_disk_get(sdkp->disk);
353 mutex_unlock(&sd_ref_mutex);
357 static void scsi_disk_put(struct scsi_disk *sdkp)
359 struct scsi_device *sdev = sdkp->device;
361 mutex_lock(&sd_ref_mutex);
362 put_device(&sdkp->dev);
363 scsi_device_put(sdev);
364 mutex_unlock(&sd_ref_mutex);
368 * sd_init_command - build a scsi (read or write) command from
369 * information in the request structure.
370 * @SCpnt: pointer to mid-level's per scsi command structure that
371 * contains request and into which the scsi command is written
373 * Returns 1 if successful and 0 if error (or cannot be done now).
375 static int sd_prep_fn(struct request_queue *q, struct request *rq)
377 struct scsi_cmnd *SCpnt;
378 struct scsi_device *sdp = q->queuedata;
379 struct gendisk *disk = rq->rq_disk;
380 struct scsi_disk *sdkp;
381 sector_t block = rq->sector;
383 unsigned int this_count = rq->nr_sectors;
384 unsigned int timeout = sdp->timeout;
387 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
388 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
390 } else if (rq->cmd_type != REQ_TYPE_FS) {
394 ret = scsi_setup_fs_cmnd(sdp, rq);
395 if (ret != BLKPREP_OK)
398 sdkp = scsi_disk(disk);
400 /* from here on until we're complete, any goto out
401 * is used for a killable error condition */
404 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
405 "sd_init_command: block=%llu, "
407 (unsigned long long)block,
410 if (!sdp || !scsi_device_online(sdp) ||
411 block + rq->nr_sectors > get_capacity(disk)) {
412 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
413 "Finishing %ld sectors\n",
415 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
416 "Retry with 0x%p\n", SCpnt));
422 * quietly refuse to do anything to a changed disc until
423 * the changed bit has been reset
425 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
430 * Some SD card readers can't handle multi-sector accesses which touch
431 * the last one or two hardware sectors. Split accesses as needed.
433 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
434 (sdp->sector_size / 512);
436 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
437 if (block < threshold) {
438 /* Access up to the threshold but not beyond */
439 this_count = threshold - block;
441 /* Access only a single hardware sector */
442 this_count = sdp->sector_size / 512;
446 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
447 (unsigned long long)block));
450 * If we have a 1K hardware sectorsize, prevent access to single
451 * 512 byte sectors. In theory we could handle this - in fact
452 * the scsi cdrom driver must be able to handle this because
453 * we typically use 1K blocksizes, and cdroms typically have
454 * 2K hardware sectorsizes. Of course, things are simpler
455 * with the cdrom, since it is read-only. For performance
456 * reasons, the filesystems should be able to handle this
457 * and not force the scsi disk driver to use bounce buffers
460 if (sdp->sector_size == 1024) {
461 if ((block & 1) || (rq->nr_sectors & 1)) {
462 scmd_printk(KERN_ERR, SCpnt,
463 "Bad block number requested\n");
467 this_count = this_count >> 1;
470 if (sdp->sector_size == 2048) {
471 if ((block & 3) || (rq->nr_sectors & 3)) {
472 scmd_printk(KERN_ERR, SCpnt,
473 "Bad block number requested\n");
477 this_count = this_count >> 2;
480 if (sdp->sector_size == 4096) {
481 if ((block & 7) || (rq->nr_sectors & 7)) {
482 scmd_printk(KERN_ERR, SCpnt,
483 "Bad block number requested\n");
487 this_count = this_count >> 3;
490 if (rq_data_dir(rq) == WRITE) {
491 if (!sdp->writeable) {
494 SCpnt->cmnd[0] = WRITE_6;
495 SCpnt->sc_data_direction = DMA_TO_DEVICE;
497 if (blk_integrity_rq(rq) &&
498 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
501 } else if (rq_data_dir(rq) == READ) {
502 SCpnt->cmnd[0] = READ_6;
503 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
505 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
509 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
510 "%s %d/%ld 512 byte blocks.\n",
511 (rq_data_dir(rq) == WRITE) ?
512 "writing" : "reading", this_count,
515 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
516 if (scsi_host_dif_capable(sdp->host, sdkp->protection_type))
517 SCpnt->cmnd[1] = 1 << 5;
521 if (block > 0xffffffff) {
522 SCpnt->cmnd[0] += READ_16 - READ_6;
523 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
524 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
525 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
526 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
527 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
528 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
529 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
530 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
531 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
532 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
533 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
534 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
535 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
536 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
537 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
538 scsi_device_protection(SCpnt->device) ||
539 SCpnt->device->use_10_for_rw) {
540 if (this_count > 0xffff)
543 SCpnt->cmnd[0] += READ_10 - READ_6;
544 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
545 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
546 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
547 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
548 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
549 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
550 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
551 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
553 if (unlikely(blk_fua_rq(rq))) {
555 * This happens only if this drive failed
556 * 10byte rw command with ILLEGAL_REQUEST
557 * during operation and thus turned off
560 scmd_printk(KERN_ERR, SCpnt,
561 "FUA write on READ/WRITE(6) drive\n");
565 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
566 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
567 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
568 SCpnt->cmnd[4] = (unsigned char) this_count;
571 SCpnt->sdb.length = this_count * sdp->sector_size;
573 /* If DIF or DIX is enabled, tell HBA how to handle request */
574 if (sdkp->protection_type || scsi_prot_sg_count(SCpnt))
575 sd_dif_op(SCpnt, sdkp->protection_type, scsi_prot_sg_count(SCpnt));
578 * We shouldn't disconnect in the middle of a sector, so with a dumb
579 * host adapter, it's safe to assume that we can at least transfer
580 * this many bytes between each connect / disconnect.
582 SCpnt->transfersize = sdp->sector_size;
583 SCpnt->underflow = this_count << 9;
584 SCpnt->allowed = SD_MAX_RETRIES;
585 SCpnt->timeout_per_command = timeout;
588 * This indicates that the command is ready from our end to be
593 return scsi_prep_return(q, rq, ret);
597 * sd_open - open a scsi disk device
598 * @inode: only i_rdev member may be used
599 * @filp: only f_mode and f_flags may be used
601 * Returns 0 if successful. Returns a negated errno value in case
604 * Note: This can be called from a user context (e.g. fsck(1) )
605 * or from within the kernel (e.g. as a result of a mount(1) ).
606 * In the latter case @inode and @filp carry an abridged amount
607 * of information as noted above.
609 static int sd_open(struct inode *inode, struct file *filp)
611 struct gendisk *disk = inode->i_bdev->bd_disk;
612 struct scsi_disk *sdkp;
613 struct scsi_device *sdev;
616 if (!(sdkp = scsi_disk_get(disk)))
620 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
625 * If the device is in error recovery, wait until it is done.
626 * If the device is offline, then disallow any access to it.
629 if (!scsi_block_when_processing_errors(sdev))
632 if (sdev->removable || sdkp->write_prot)
633 check_disk_change(inode->i_bdev);
636 * If the drive is empty, just let the open fail.
639 if (sdev->removable && !sdkp->media_present &&
640 !(filp->f_flags & O_NDELAY))
644 * If the device has the write protect tab set, have the open fail
645 * if the user expects to be able to write to the thing.
648 if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE))
652 * It is possible that the disk changing stuff resulted in
653 * the device being taken offline. If this is the case,
654 * report this to the user, and don't pretend that the
655 * open actually succeeded.
658 if (!scsi_device_online(sdev))
661 if (!sdkp->openers++ && sdev->removable) {
662 if (scsi_block_when_processing_errors(sdev))
663 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
674 * sd_release - invoked when the (last) close(2) is called on this
676 * @inode: only i_rdev member may be used
677 * @filp: only f_mode and f_flags may be used
681 * Note: may block (uninterruptible) if error recovery is underway
684 static int sd_release(struct inode *inode, struct file *filp)
686 struct gendisk *disk = inode->i_bdev->bd_disk;
687 struct scsi_disk *sdkp = scsi_disk(disk);
688 struct scsi_device *sdev = sdkp->device;
690 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
692 if (!--sdkp->openers && sdev->removable) {
693 if (scsi_block_when_processing_errors(sdev))
694 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
698 * XXX and what if there are packets in flight and this close()
699 * XXX is followed by a "rmmod sd_mod"?
705 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
707 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
708 struct scsi_device *sdp = sdkp->device;
709 struct Scsi_Host *host = sdp->host;
712 /* default to most commonly used values */
713 diskinfo[0] = 0x40; /* 1 << 6 */
714 diskinfo[1] = 0x20; /* 1 << 5 */
715 diskinfo[2] = sdkp->capacity >> 11;
717 /* override with calculated, extended default, or driver values */
718 if (host->hostt->bios_param)
719 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
721 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
723 geo->heads = diskinfo[0];
724 geo->sectors = diskinfo[1];
725 geo->cylinders = diskinfo[2];
730 * sd_ioctl - process an ioctl
731 * @inode: only i_rdev/i_bdev members may be used
732 * @filp: only f_mode and f_flags may be used
733 * @cmd: ioctl command number
734 * @arg: this is third argument given to ioctl(2) system call.
735 * Often contains a pointer.
737 * Returns 0 if successful (some ioctls return postive numbers on
738 * success as well). Returns a negated errno value in case of error.
740 * Note: most ioctls are forward onto the block subsystem or further
741 * down in the scsi subsystem.
743 static int sd_ioctl(struct inode * inode, struct file * filp,
744 unsigned int cmd, unsigned long arg)
746 struct block_device *bdev = inode->i_bdev;
747 struct gendisk *disk = bdev->bd_disk;
748 struct scsi_device *sdp = scsi_disk(disk)->device;
749 void __user *p = (void __user *)arg;
752 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
753 disk->disk_name, cmd));
756 * If we are in the middle of error recovery, don't let anyone
757 * else try and use this device. Also, if error recovery fails, it
758 * may try and take the device offline, in which case all further
759 * access to the device is prohibited.
761 error = scsi_nonblockable_ioctl(sdp, cmd, p, filp);
762 if (!scsi_block_when_processing_errors(sdp) || !error)
766 * Send SCSI addressing ioctls directly to mid level, send other
767 * ioctls to block level and then onto mid level if they can't be
771 case SCSI_IOCTL_GET_IDLUN:
772 case SCSI_IOCTL_GET_BUS_NUMBER:
773 return scsi_ioctl(sdp, cmd, p);
775 error = scsi_cmd_ioctl(filp, disk->queue, disk, cmd, p);
776 if (error != -ENOTTY)
779 return scsi_ioctl(sdp, cmd, p);
782 static void set_media_not_present(struct scsi_disk *sdkp)
784 sdkp->media_present = 0;
786 sdkp->device->changed = 1;
790 * sd_media_changed - check if our medium changed
791 * @disk: kernel device descriptor
793 * Returns 0 if not applicable or no change; 1 if change
795 * Note: this function is invoked from the block subsystem.
797 static int sd_media_changed(struct gendisk *disk)
799 struct scsi_disk *sdkp = scsi_disk(disk);
800 struct scsi_device *sdp = sdkp->device;
801 struct scsi_sense_hdr *sshdr = NULL;
804 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
810 * If the device is offline, don't send any commands - just pretend as
811 * if the command failed. If the device ever comes back online, we
812 * can deal with it then. It is only because of unrecoverable errors
813 * that we would ever take a device offline in the first place.
815 if (!scsi_device_online(sdp)) {
816 set_media_not_present(sdkp);
822 * Using TEST_UNIT_READY enables differentiation between drive with
823 * no cartridge loaded - NOT READY, drive with changed cartridge -
824 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
826 * Drives that auto spin down. eg iomega jaz 1G, will be started
827 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
828 * sd_revalidate() is called.
832 if (scsi_block_when_processing_errors(sdp)) {
833 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
834 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
839 * Unable to test, unit probably not ready. This usually
840 * means there is no disc in the drive. Mark as changed,
841 * and we will figure it out later once the drive is
844 if (retval || (scsi_sense_valid(sshdr) &&
845 /* 0x3a is medium not present */
846 sshdr->asc == 0x3a)) {
847 set_media_not_present(sdkp);
853 * For removable scsi disk we have to recognise the presence
854 * of a disk in the drive. This is kept in the struct scsi_disk
855 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
857 sdkp->media_present = 1;
859 retval = sdp->changed;
862 if (retval != sdkp->previous_state)
863 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
864 sdkp->previous_state = retval;
869 static int sd_sync_cache(struct scsi_disk *sdkp)
872 struct scsi_device *sdp = sdkp->device;
873 struct scsi_sense_hdr sshdr;
875 if (!scsi_device_online(sdp))
879 for (retries = 3; retries > 0; --retries) {
880 unsigned char cmd[10] = { 0 };
882 cmd[0] = SYNCHRONIZE_CACHE;
884 * Leave the rest of the command zero to indicate
887 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
888 SD_TIMEOUT, SD_MAX_RETRIES);
894 sd_print_result(sdkp, res);
895 if (driver_byte(res) & DRIVER_SENSE)
896 sd_print_sense_hdr(sdkp, &sshdr);
904 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
906 rq->cmd_type = REQ_TYPE_BLOCK_PC;
907 rq->timeout = SD_TIMEOUT;
908 rq->cmd[0] = SYNCHRONIZE_CACHE;
912 static void sd_rescan(struct device *dev)
914 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
917 sd_revalidate_disk(sdkp->disk);
925 * This gets directly called from VFS. When the ioctl
926 * is not recognized we go back to the other translation paths.
928 static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
930 struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev;
931 struct gendisk *disk = bdev->bd_disk;
932 struct scsi_device *sdev = scsi_disk(disk)->device;
935 * If we are in the middle of error recovery, don't let anyone
936 * else try and use this device. Also, if error recovery fails, it
937 * may try and take the device offline, in which case all further
938 * access to the device is prohibited.
940 if (!scsi_block_when_processing_errors(sdev))
943 if (sdev->host->hostt->compat_ioctl) {
946 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
952 * Let the static ioctl translation table take care of it.
958 static struct block_device_operations sd_fops = {
959 .owner = THIS_MODULE,
961 .release = sd_release,
965 .compat_ioctl = sd_compat_ioctl,
967 .media_changed = sd_media_changed,
968 .revalidate_disk = sd_revalidate_disk,
971 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
973 u64 start_lba = scmd->request->sector;
974 u64 end_lba = scmd->request->sector + (scsi_bufflen(scmd) / 512);
978 if (!blk_fs_request(scmd->request))
981 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
982 SCSI_SENSE_BUFFERSIZE,
987 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
990 if (scmd->device->sector_size < 512) {
991 /* only legitimate sector_size here is 256 */
995 /* be careful ... don't want any overflows */
996 u64 factor = scmd->device->sector_size / 512;
997 do_div(start_lba, factor);
998 do_div(end_lba, factor);
1001 /* The bad lba was reported incorrectly, we have no idea where
1004 if (bad_lba < start_lba || bad_lba >= end_lba)
1007 /* This computation should always be done in terms of
1008 * the resolution of the device's medium.
1010 return (bad_lba - start_lba) * scmd->device->sector_size;
1014 * sd_done - bottom half handler: called when the lower level
1015 * driver has completed (successfully or otherwise) a scsi command.
1016 * @SCpnt: mid-level's per command structure.
1018 * Note: potentially run from within an ISR. Must not block.
1020 static int sd_done(struct scsi_cmnd *SCpnt)
1022 int result = SCpnt->result;
1023 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1024 struct scsi_sense_hdr sshdr;
1025 int sense_valid = 0;
1026 int sense_deferred = 0;
1029 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1031 sense_deferred = scsi_sense_is_deferred(&sshdr);
1033 #ifdef CONFIG_SCSI_LOGGING
1034 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1036 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1037 "sd_done: sb[respc,sk,asc,"
1038 "ascq]=%x,%x,%x,%x\n",
1039 sshdr.response_code,
1040 sshdr.sense_key, sshdr.asc,
1044 if (driver_byte(result) != DRIVER_SENSE &&
1045 (!sense_valid || sense_deferred))
1048 switch (sshdr.sense_key) {
1049 case HARDWARE_ERROR:
1051 good_bytes = sd_completed_bytes(SCpnt);
1053 case RECOVERED_ERROR:
1055 /* Inform the user, but make sure that it's not treated
1058 scsi_print_sense("sd", SCpnt);
1060 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1061 good_bytes = scsi_bufflen(SCpnt);
1063 case ABORTED_COMMAND:
1064 if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */
1065 scsi_print_result(SCpnt);
1066 scsi_print_sense("sd", SCpnt);
1067 good_bytes = sd_completed_bytes(SCpnt);
1070 case ILLEGAL_REQUEST:
1071 if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */
1072 scsi_print_result(SCpnt);
1073 scsi_print_sense("sd", SCpnt);
1074 good_bytes = sd_completed_bytes(SCpnt);
1076 if (!scsi_device_protection(SCpnt->device) &&
1077 SCpnt->device->use_10_for_rw &&
1078 (SCpnt->cmnd[0] == READ_10 ||
1079 SCpnt->cmnd[0] == WRITE_10))
1080 SCpnt->device->use_10_for_rw = 0;
1081 if (SCpnt->device->use_10_for_ms &&
1082 (SCpnt->cmnd[0] == MODE_SENSE_10 ||
1083 SCpnt->cmnd[0] == MODE_SELECT_10))
1084 SCpnt->device->use_10_for_ms = 0;
1090 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1091 sd_dif_complete(SCpnt, good_bytes);
1096 static int media_not_present(struct scsi_disk *sdkp,
1097 struct scsi_sense_hdr *sshdr)
1100 if (!scsi_sense_valid(sshdr))
1102 /* not invoked for commands that could return deferred errors */
1103 if (sshdr->sense_key != NOT_READY &&
1104 sshdr->sense_key != UNIT_ATTENTION)
1106 if (sshdr->asc != 0x3A) /* medium not present */
1109 set_media_not_present(sdkp);
1114 * spinup disk - called only in sd_revalidate_disk()
1117 sd_spinup_disk(struct scsi_disk *sdkp)
1119 unsigned char cmd[10];
1120 unsigned long spintime_expire = 0;
1121 int retries, spintime;
1122 unsigned int the_result;
1123 struct scsi_sense_hdr sshdr;
1124 int sense_valid = 0;
1128 /* Spin up drives, as required. Only do this at boot time */
1129 /* Spinup needs to be done for module loads too. */
1134 cmd[0] = TEST_UNIT_READY;
1135 memset((void *) &cmd[1], 0, 9);
1137 the_result = scsi_execute_req(sdkp->device, cmd,
1143 * If the drive has indicated to us that it
1144 * doesn't have any media in it, don't bother
1145 * with any more polling.
1147 if (media_not_present(sdkp, &sshdr))
1151 sense_valid = scsi_sense_valid(&sshdr);
1153 } while (retries < 3 &&
1154 (!scsi_status_is_good(the_result) ||
1155 ((driver_byte(the_result) & DRIVER_SENSE) &&
1156 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1158 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1159 /* no sense, TUR either succeeded or failed
1160 * with a status error */
1161 if(!spintime && !scsi_status_is_good(the_result)) {
1162 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1163 sd_print_result(sdkp, the_result);
1169 * The device does not want the automatic start to be issued.
1171 if (sdkp->device->no_start_on_add) {
1176 * If manual intervention is required, or this is an
1177 * absent USB storage device, a spinup is meaningless.
1180 sshdr.sense_key == NOT_READY &&
1181 sshdr.asc == 4 && sshdr.ascq == 3) {
1182 break; /* manual intervention required */
1185 * Issue command to spin up drive when not ready
1187 } else if (sense_valid && sshdr.sense_key == NOT_READY) {
1189 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1190 cmd[0] = START_STOP;
1191 cmd[1] = 1; /* Return immediately */
1192 memset((void *) &cmd[2], 0, 8);
1193 cmd[4] = 1; /* Start spin cycle */
1194 if (sdkp->device->start_stop_pwr_cond)
1196 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1198 SD_TIMEOUT, SD_MAX_RETRIES);
1199 spintime_expire = jiffies + 100 * HZ;
1202 /* Wait 1 second for next try */
1207 * Wait for USB flash devices with slow firmware.
1208 * Yes, this sense key/ASC combination shouldn't
1209 * occur here. It's characteristic of these devices.
1211 } else if (sense_valid &&
1212 sshdr.sense_key == UNIT_ATTENTION &&
1213 sshdr.asc == 0x28) {
1215 spintime_expire = jiffies + 5 * HZ;
1218 /* Wait 1 second for next try */
1221 /* we don't understand the sense code, so it's
1222 * probably pointless to loop */
1224 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1225 sd_print_sense_hdr(sdkp, &sshdr);
1230 } while (spintime && time_before_eq(jiffies, spintime_expire));
1233 if (scsi_status_is_good(the_result))
1236 printk("not responding...\n");
1242 * Determine whether disk supports Data Integrity Field.
1244 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1246 struct scsi_device *sdp = sdkp->device;
1249 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1252 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1255 case SD_DIF_TYPE0_PROTECTION:
1256 sdkp->protection_type = 0;
1259 case SD_DIF_TYPE1_PROTECTION:
1260 case SD_DIF_TYPE3_PROTECTION:
1261 sdkp->protection_type = type;
1264 case SD_DIF_TYPE2_PROTECTION:
1265 sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \
1266 "protection which is currently unsupported. " \
1267 "Disabling disk!\n");
1271 sd_printk(KERN_ERR, sdkp, "formatted with unknown " \
1272 "protection type %d. Disabling disk!\n", type);
1279 sdkp->protection_type = 0;
1284 * read disk capacity
1287 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1289 unsigned char cmd[16];
1290 int the_result, retries;
1291 int sector_size = 0;
1292 /* Force READ CAPACITY(16) when PROTECT=1 */
1293 int longrc = scsi_device_protection(sdkp->device) ? 1 : 0;
1294 struct scsi_sense_hdr sshdr;
1295 int sense_valid = 0;
1296 struct scsi_device *sdp = sdkp->device;
1302 memset((void *) cmd, 0, 16);
1303 cmd[0] = SERVICE_ACTION_IN;
1304 cmd[1] = SAI_READ_CAPACITY_16;
1306 memset((void *) buffer, 0, 13);
1308 cmd[0] = READ_CAPACITY;
1309 memset((void *) &cmd[1], 0, 9);
1310 memset((void *) buffer, 0, 8);
1313 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1314 buffer, longrc ? 13 : 8, &sshdr,
1315 SD_TIMEOUT, SD_MAX_RETRIES);
1317 if (media_not_present(sdkp, &sshdr))
1321 sense_valid = scsi_sense_valid(&sshdr);
1324 } while (the_result && retries);
1326 if (the_result && !longrc) {
1327 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1328 sd_print_result(sdkp, the_result);
1329 if (driver_byte(the_result) & DRIVER_SENSE)
1330 sd_print_sense_hdr(sdkp, &sshdr);
1332 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1334 /* Set dirty bit for removable devices if not ready -
1335 * sometimes drives will not report this properly. */
1336 if (sdp->removable &&
1337 sense_valid && sshdr.sense_key == NOT_READY)
1340 /* Either no media are present but the drive didn't tell us,
1341 or they are present but the read capacity command fails */
1342 /* sdkp->media_present = 0; -- not always correct */
1343 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1346 } else if (the_result && longrc) {
1347 /* READ CAPACITY(16) has been failed */
1348 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1349 sd_print_result(sdkp, the_result);
1350 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n");
1352 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1357 sector_size = (buffer[4] << 24) |
1358 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
1359 if (buffer[0] == 0xff && buffer[1] == 0xff &&
1360 buffer[2] == 0xff && buffer[3] == 0xff) {
1361 if(sizeof(sdkp->capacity) > 4) {
1362 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1363 "Trying to use READ CAPACITY(16).\n");
1367 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use "
1368 "a kernel compiled with support for large "
1369 "block devices.\n");
1373 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
1378 sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
1379 ((u64)buffer[1] << 48) |
1380 ((u64)buffer[2] << 40) |
1381 ((u64)buffer[3] << 32) |
1382 ((sector_t)buffer[4] << 24) |
1383 ((sector_t)buffer[5] << 16) |
1384 ((sector_t)buffer[6] << 8) |
1385 (sector_t)buffer[7]);
1387 sector_size = (buffer[8] << 24) |
1388 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
1390 sd_read_protection_type(sdkp, buffer);
1393 /* Some devices return the total number of sectors, not the
1394 * highest sector number. Make the necessary adjustment. */
1395 if (sdp->fix_capacity) {
1398 /* Some devices have version which report the correct sizes
1399 * and others which do not. We guess size according to a heuristic
1400 * and err on the side of lowering the capacity. */
1402 if (sdp->guess_capacity)
1403 if (sdkp->capacity & 0x01) /* odd sizes are odd */
1408 if (sector_size == 0) {
1410 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1414 if (sector_size != 512 &&
1415 sector_size != 1024 &&
1416 sector_size != 2048 &&
1417 sector_size != 4096 &&
1418 sector_size != 256) {
1419 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1422 * The user might want to re-format the drive with
1423 * a supported sectorsize. Once this happens, it
1424 * would be relatively trivial to set the thing up.
1425 * For this reason, we leave the thing in the table.
1429 * set a bogus sector size so the normal read/write
1430 * logic in the block layer will eventually refuse any
1431 * request on this device without tripping over power
1432 * of two sector size assumptions
1438 * The msdos fs needs to know the hardware sector size
1439 * So I have created this table. See ll_rw_blk.c
1440 * Jacques Gelinas (Jacques@solucorp.qc.ca)
1442 int hard_sector = sector_size;
1443 sector_t sz = (sdkp->capacity/2) * (hard_sector/256);
1444 struct request_queue *queue = sdp->request_queue;
1447 blk_queue_hardsect_size(queue, hard_sector);
1448 /* avoid 64-bit division on 32-bit platforms */
1449 sector_div(sz, 625);
1451 sector_div(mb, 1950);
1453 sd_printk(KERN_NOTICE, sdkp,
1454 "%llu %d-byte hardware sectors (%llu MB)\n",
1455 (unsigned long long)sdkp->capacity,
1456 hard_sector, (unsigned long long)mb);
1459 /* Rescale capacity to 512-byte units */
1460 if (sector_size == 4096)
1461 sdkp->capacity <<= 3;
1462 else if (sector_size == 2048)
1463 sdkp->capacity <<= 2;
1464 else if (sector_size == 1024)
1465 sdkp->capacity <<= 1;
1466 else if (sector_size == 256)
1467 sdkp->capacity >>= 1;
1469 sdkp->device->sector_size = sector_size;
1472 /* called with buffer of length 512 */
1474 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1475 unsigned char *buffer, int len, struct scsi_mode_data *data,
1476 struct scsi_sense_hdr *sshdr)
1478 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1479 SD_TIMEOUT, SD_MAX_RETRIES, data,
1484 * read write protect setting, if possible - called only in sd_revalidate_disk()
1485 * called with buffer of length SD_BUF_SIZE
1488 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1491 struct scsi_device *sdp = sdkp->device;
1492 struct scsi_mode_data data;
1494 set_disk_ro(sdkp->disk, 0);
1495 if (sdp->skip_ms_page_3f) {
1496 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1500 if (sdp->use_192_bytes_for_3f) {
1501 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1504 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1505 * We have to start carefully: some devices hang if we ask
1506 * for more than is available.
1508 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1511 * Second attempt: ask for page 0 When only page 0 is
1512 * implemented, a request for page 3F may return Sense Key
1513 * 5: Illegal Request, Sense Code 24: Invalid field in
1516 if (!scsi_status_is_good(res))
1517 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1520 * Third attempt: ask 255 bytes, as we did earlier.
1522 if (!scsi_status_is_good(res))
1523 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1527 if (!scsi_status_is_good(res)) {
1528 sd_printk(KERN_WARNING, sdkp,
1529 "Test WP failed, assume Write Enabled\n");
1531 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1532 set_disk_ro(sdkp->disk, sdkp->write_prot);
1533 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1534 sdkp->write_prot ? "on" : "off");
1535 sd_printk(KERN_DEBUG, sdkp,
1536 "Mode Sense: %02x %02x %02x %02x\n",
1537 buffer[0], buffer[1], buffer[2], buffer[3]);
1542 * sd_read_cache_type - called only from sd_revalidate_disk()
1543 * called with buffer of length SD_BUF_SIZE
1546 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1549 struct scsi_device *sdp = sdkp->device;
1553 struct scsi_mode_data data;
1554 struct scsi_sense_hdr sshdr;
1556 if (sdp->skip_ms_page_8)
1559 if (sdp->type == TYPE_RBC) {
1567 /* cautiously ask */
1568 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1570 if (!scsi_status_is_good(res))
1573 if (!data.header_length) {
1575 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1578 /* that went OK, now ask for the proper length */
1582 * We're only interested in the first three bytes, actually.
1583 * But the data cache page is defined for the first 20.
1590 /* Take headers and block descriptors into account */
1591 len += data.header_length + data.block_descriptor_length;
1592 if (len > SD_BUF_SIZE)
1596 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1598 if (scsi_status_is_good(res)) {
1599 int offset = data.header_length + data.block_descriptor_length;
1601 if (offset >= SD_BUF_SIZE - 2) {
1602 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1606 if ((buffer[offset] & 0x3f) != modepage) {
1607 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1611 if (modepage == 8) {
1612 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1613 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1615 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1619 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1620 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1621 sd_printk(KERN_NOTICE, sdkp,
1622 "Uses READ/WRITE(6), disabling FUA\n");
1626 sd_printk(KERN_NOTICE, sdkp,
1627 "Write cache: %s, read cache: %s, %s\n",
1628 sdkp->WCE ? "enabled" : "disabled",
1629 sdkp->RCD ? "disabled" : "enabled",
1630 sdkp->DPOFUA ? "supports DPO and FUA"
1631 : "doesn't support DPO or FUA");
1637 if (scsi_sense_valid(&sshdr) &&
1638 sshdr.sense_key == ILLEGAL_REQUEST &&
1639 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1640 /* Invalid field in CDB */
1641 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1643 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1646 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1653 * The ATO bit indicates whether the DIF application tag is available
1654 * for use by the operating system.
1656 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1659 struct scsi_device *sdp = sdkp->device;
1660 struct scsi_mode_data data;
1661 struct scsi_sense_hdr sshdr;
1663 if (sdp->type != TYPE_DISK)
1666 if (sdkp->protection_type == 0)
1669 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1670 SD_MAX_RETRIES, &data, &sshdr);
1672 if (!scsi_status_is_good(res) || !data.header_length ||
1674 sd_printk(KERN_WARNING, sdkp,
1675 "getting Control mode page failed, assume no ATO\n");
1677 if (scsi_sense_valid(&sshdr))
1678 sd_print_sense_hdr(sdkp, &sshdr);
1683 offset = data.header_length + data.block_descriptor_length;
1685 if ((buffer[offset] & 0x3f) != 0x0a) {
1686 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1690 if ((buffer[offset + 5] & 0x80) == 0)
1699 * sd_revalidate_disk - called the first time a new disk is seen,
1700 * performs disk spin up, read_capacity, etc.
1701 * @disk: struct gendisk we care about
1703 static int sd_revalidate_disk(struct gendisk *disk)
1705 struct scsi_disk *sdkp = scsi_disk(disk);
1706 struct scsi_device *sdp = sdkp->device;
1707 unsigned char *buffer;
1710 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
1711 "sd_revalidate_disk\n"));
1714 * If the device is offline, don't try and read capacity or any
1715 * of the other niceties.
1717 if (!scsi_device_online(sdp))
1720 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1722 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
1723 "allocation failure.\n");
1727 /* defaults, until the device tells us otherwise */
1728 sdp->sector_size = 512;
1730 sdkp->media_present = 1;
1731 sdkp->write_prot = 0;
1736 sd_spinup_disk(sdkp);
1739 * Without media there is no reason to ask; moreover, some devices
1740 * react badly if we do.
1742 if (sdkp->media_present) {
1743 sd_read_capacity(sdkp, buffer);
1744 sd_read_write_protect_flag(sdkp, buffer);
1745 sd_read_cache_type(sdkp, buffer);
1746 sd_read_app_tag_own(sdkp, buffer);
1750 * We now have all cache related info, determine how we deal
1751 * with ordered requests. Note that as the current SCSI
1752 * dispatch function can alter request order, we cannot use
1753 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1756 ordered = sdkp->DPOFUA
1757 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
1759 ordered = QUEUE_ORDERED_DRAIN;
1761 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1763 set_capacity(disk, sdkp->capacity);
1771 * sd_probe - called during driver initialization and whenever a
1772 * new scsi device is attached to the system. It is called once
1773 * for each scsi device (not just disks) present.
1774 * @dev: pointer to device object
1776 * Returns 0 if successful (or not interested in this scsi device
1777 * (e.g. scanner)); 1 when there is an error.
1779 * Note: this function is invoked from the scsi mid-level.
1780 * This function sets up the mapping between a given
1781 * <host,channel,id,lun> (found in sdp) and new device name
1782 * (e.g. /dev/sda). More precisely it is the block device major
1783 * and minor number that is chosen here.
1785 * Assume sd_attach is not re-entrant (for time being)
1786 * Also think about sd_attach() and sd_remove() running coincidentally.
1788 static int sd_probe(struct device *dev)
1790 struct scsi_device *sdp = to_scsi_device(dev);
1791 struct scsi_disk *sdkp;
1797 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1800 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
1804 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1808 gd = alloc_disk_ext(SD_MINORS, SD_EXT_MINORS);
1813 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
1816 error = ida_get_new(&sd_index_ida, &index);
1817 } while (error == -EAGAIN);
1823 if (index >= SD_MAX_DISKS)
1824 goto out_free_index;
1827 sdkp->driver = &sd_template;
1829 sdkp->index = index;
1831 sdkp->previous_state = 1;
1833 if (!sdp->timeout) {
1834 if (sdp->type != TYPE_MOD)
1835 sdp->timeout = SD_TIMEOUT;
1837 sdp->timeout = SD_MOD_TIMEOUT;
1840 device_initialize(&sdkp->dev);
1841 sdkp->dev.parent = &sdp->sdev_gendev;
1842 sdkp->dev.class = &sd_disk_class;
1843 strncpy(sdkp->dev.bus_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
1845 if (device_add(&sdkp->dev))
1846 goto out_free_index;
1848 get_device(&sdp->sdev_gendev);
1850 gd->major = sd_major((index & 0xf0) >> 4);
1851 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
1852 gd->minors = SD_MINORS;
1853 gd->ext_minors = SD_EXT_MINORS;
1854 gd->fops = &sd_fops;
1857 sprintf(gd->disk_name, "sd%c", 'a' + index % 26);
1858 } else if (index < (26 + 1) * 26) {
1859 sprintf(gd->disk_name, "sd%c%c",
1860 'a' + index / 26 - 1,'a' + index % 26);
1862 const unsigned int m1 = (index / 26 - 1) / 26 - 1;
1863 const unsigned int m2 = (index / 26 - 1) % 26;
1864 const unsigned int m3 = index % 26;
1865 sprintf(gd->disk_name, "sd%c%c%c",
1866 'a' + m1, 'a' + m2, 'a' + m3);
1869 gd->private_data = &sdkp->driver;
1870 gd->queue = sdkp->device->request_queue;
1872 sd_revalidate_disk(gd);
1874 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
1876 gd->driverfs_dev = &sdp->sdev_gendev;
1877 gd->flags = GENHD_FL_DRIVERFS;
1879 gd->flags |= GENHD_FL_REMOVABLE;
1881 dev_set_drvdata(dev, sdkp);
1883 sd_dif_config_host(sdkp);
1885 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
1886 sdp->removable ? "removable " : "");
1891 ida_remove(&sd_index_ida, index);
1901 * sd_remove - called whenever a scsi disk (previously recognized by
1902 * sd_probe) is detached from the system. It is called (potentially
1903 * multiple times) during sd module unload.
1904 * @sdp: pointer to mid level scsi device object
1906 * Note: this function is invoked from the scsi mid-level.
1907 * This function potentially frees up a device name (e.g. /dev/sdc)
1908 * that could be re-used by a subsequent sd_probe().
1909 * This function is not called when the built-in sd driver is "exit-ed".
1911 static int sd_remove(struct device *dev)
1913 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1915 device_del(&sdkp->dev);
1916 del_gendisk(sdkp->disk);
1919 mutex_lock(&sd_ref_mutex);
1920 dev_set_drvdata(dev, NULL);
1921 put_device(&sdkp->dev);
1922 mutex_unlock(&sd_ref_mutex);
1928 * scsi_disk_release - Called to free the scsi_disk structure
1929 * @dev: pointer to embedded class device
1931 * sd_ref_mutex must be held entering this routine. Because it is
1932 * called on last put, you should always use the scsi_disk_get()
1933 * scsi_disk_put() helpers which manipulate the semaphore directly
1934 * and never do a direct put_device.
1936 static void scsi_disk_release(struct device *dev)
1938 struct scsi_disk *sdkp = to_scsi_disk(dev);
1939 struct gendisk *disk = sdkp->disk;
1941 ida_remove(&sd_index_ida, sdkp->index);
1943 disk->private_data = NULL;
1945 put_device(&sdkp->device->sdev_gendev);
1950 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
1952 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
1953 struct scsi_sense_hdr sshdr;
1954 struct scsi_device *sdp = sdkp->device;
1958 cmd[4] |= 1; /* START */
1960 if (sdp->start_stop_pwr_cond)
1961 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
1963 if (!scsi_device_online(sdp))
1966 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1967 SD_TIMEOUT, SD_MAX_RETRIES);
1969 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
1970 sd_print_result(sdkp, res);
1971 if (driver_byte(res) & DRIVER_SENSE)
1972 sd_print_sense_hdr(sdkp, &sshdr);
1979 * Send a SYNCHRONIZE CACHE instruction down to the device through
1980 * the normal SCSI command structure. Wait for the command to
1983 static void sd_shutdown(struct device *dev)
1985 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1988 return; /* this can happen */
1991 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
1992 sd_sync_cache(sdkp);
1995 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
1996 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
1997 sd_start_stop_device(sdkp, 0);
2000 scsi_disk_put(sdkp);
2003 static int sd_suspend(struct device *dev, pm_message_t mesg)
2005 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2009 return 0; /* this can happen */
2012 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2013 ret = sd_sync_cache(sdkp);
2018 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2019 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2020 ret = sd_start_stop_device(sdkp, 0);
2024 scsi_disk_put(sdkp);
2028 static int sd_resume(struct device *dev)
2030 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2033 if (!sdkp->device->manage_start_stop)
2036 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2037 ret = sd_start_stop_device(sdkp, 1);
2040 scsi_disk_put(sdkp);
2045 * init_sd - entry point for this driver (both when built in or when
2048 * Note: this function registers this driver with the scsi mid-level.
2050 static int __init init_sd(void)
2052 int majors = 0, i, err;
2054 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2056 for (i = 0; i < SD_MAJORS; i++)
2057 if (register_blkdev(sd_major(i), "sd") == 0)
2063 err = class_register(&sd_disk_class);
2067 err = scsi_register_driver(&sd_template.gendrv);
2074 class_unregister(&sd_disk_class);
2076 for (i = 0; i < SD_MAJORS; i++)
2077 unregister_blkdev(sd_major(i), "sd");
2082 * exit_sd - exit point for this driver (when it is a module).
2084 * Note: this function unregisters this driver from the scsi mid-level.
2086 static void __exit exit_sd(void)
2090 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2092 scsi_unregister_driver(&sd_template.gendrv);
2093 class_unregister(&sd_disk_class);
2095 for (i = 0; i < SD_MAJORS; i++)
2096 unregister_blkdev(sd_major(i), "sd");
2099 module_init(init_sd);
2100 module_exit(exit_sd);
2102 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2103 struct scsi_sense_hdr *sshdr)
2105 sd_printk(KERN_INFO, sdkp, "");
2106 scsi_show_sense_hdr(sshdr);
2107 sd_printk(KERN_INFO, sdkp, "");
2108 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2111 static void sd_print_result(struct scsi_disk *sdkp, int result)
2113 sd_printk(KERN_INFO, sdkp, "");
2114 scsi_show_result(result);