mfd: wm8350-i2c: Make sure the i2c regmap functions are compiled
[linux/fpc-iii.git] / drivers / scsi / sd.c
blobf1e3b539888746fd4870226d23ee314ff461875b
1 /*
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>
36 #include <linux/fs.h>
37 #include <linux/kernel.h>
38 #include <linux/mm.h>
39 #include <linux/bio.h>
40 #include <linux/genhd.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <linux/async.h>
52 #include <linux/slab.h>
53 #include <linux/pm_runtime.h>
54 #include <asm/uaccess.h>
55 #include <asm/unaligned.h>
57 #include <scsi/scsi.h>
58 #include <scsi/scsi_cmnd.h>
59 #include <scsi/scsi_dbg.h>
60 #include <scsi/scsi_device.h>
61 #include <scsi/scsi_driver.h>
62 #include <scsi/scsi_eh.h>
63 #include <scsi/scsi_host.h>
64 #include <scsi/scsi_ioctl.h>
65 #include <scsi/scsicam.h>
67 #include "sd.h"
68 #include "scsi_priv.h"
69 #include "scsi_logging.h"
71 MODULE_AUTHOR("Eric Youngdale");
72 MODULE_DESCRIPTION("SCSI disk (sd) driver");
73 MODULE_LICENSE("GPL");
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
95 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
96 #define SD_MINORS 16
97 #else
98 #define SD_MINORS 0
99 #endif
101 static void sd_config_discard(struct scsi_disk *, unsigned int);
102 static void sd_config_write_same(struct scsi_disk *);
103 static int sd_revalidate_disk(struct gendisk *);
104 static void sd_unlock_native_capacity(struct gendisk *disk);
105 static int sd_probe(struct device *);
106 static int sd_remove(struct device *);
107 static void sd_shutdown(struct device *);
108 static int sd_suspend(struct device *);
109 static int sd_resume(struct device *);
110 static void sd_rescan(struct device *);
111 static int sd_done(struct scsi_cmnd *);
112 static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
113 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
114 static void scsi_disk_release(struct device *cdev);
115 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
116 static void sd_print_result(struct scsi_disk *, int);
118 static DEFINE_SPINLOCK(sd_index_lock);
119 static DEFINE_IDA(sd_index_ida);
121 /* This semaphore is used to mediate the 0->1 reference get in the
122 * face of object destruction (i.e. we can't allow a get on an
123 * object after last put) */
124 static DEFINE_MUTEX(sd_ref_mutex);
126 static struct kmem_cache *sd_cdb_cache;
127 static mempool_t *sd_cdb_pool;
129 static const char *sd_cache_types[] = {
130 "write through", "none", "write back",
131 "write back, no read (daft)"
134 static ssize_t
135 cache_type_store(struct device *dev, struct device_attribute *attr,
136 const char *buf, size_t count)
138 int i, ct = -1, rcd, wce, sp;
139 struct scsi_disk *sdkp = to_scsi_disk(dev);
140 struct scsi_device *sdp = sdkp->device;
141 char buffer[64];
142 char *buffer_data;
143 struct scsi_mode_data data;
144 struct scsi_sense_hdr sshdr;
145 static const char temp[] = "temporary ";
146 int len;
148 if (sdp->type != TYPE_DISK)
149 /* no cache control on RBC devices; theoretically they
150 * can do it, but there's probably so many exceptions
151 * it's not worth the risk */
152 return -EINVAL;
154 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
155 buf += sizeof(temp) - 1;
156 sdkp->cache_override = 1;
157 } else {
158 sdkp->cache_override = 0;
161 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
162 len = strlen(sd_cache_types[i]);
163 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
164 buf[len] == '\n') {
165 ct = i;
166 break;
169 if (ct < 0)
170 return -EINVAL;
171 rcd = ct & 0x01 ? 1 : 0;
172 wce = ct & 0x02 ? 1 : 0;
174 if (sdkp->cache_override) {
175 sdkp->WCE = wce;
176 sdkp->RCD = rcd;
177 return count;
180 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
181 SD_MAX_RETRIES, &data, NULL))
182 return -EINVAL;
183 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
184 data.block_descriptor_length);
185 buffer_data = buffer + data.header_length +
186 data.block_descriptor_length;
187 buffer_data[2] &= ~0x05;
188 buffer_data[2] |= wce << 2 | rcd;
189 sp = buffer_data[0] & 0x80 ? 1 : 0;
191 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
192 SD_MAX_RETRIES, &data, &sshdr)) {
193 if (scsi_sense_valid(&sshdr))
194 sd_print_sense_hdr(sdkp, &sshdr);
195 return -EINVAL;
197 revalidate_disk(sdkp->disk);
198 return count;
201 static ssize_t
202 manage_start_stop_show(struct device *dev, struct device_attribute *attr,
203 char *buf)
205 struct scsi_disk *sdkp = to_scsi_disk(dev);
206 struct scsi_device *sdp = sdkp->device;
208 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
211 static ssize_t
212 manage_start_stop_store(struct device *dev, struct device_attribute *attr,
213 const char *buf, size_t count)
215 struct scsi_disk *sdkp = to_scsi_disk(dev);
216 struct scsi_device *sdp = sdkp->device;
218 if (!capable(CAP_SYS_ADMIN))
219 return -EACCES;
221 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
223 return count;
225 static DEVICE_ATTR_RW(manage_start_stop);
227 static ssize_t
228 allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
230 struct scsi_disk *sdkp = to_scsi_disk(dev);
232 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
235 static ssize_t
236 allow_restart_store(struct device *dev, struct device_attribute *attr,
237 const char *buf, size_t count)
239 struct scsi_disk *sdkp = to_scsi_disk(dev);
240 struct scsi_device *sdp = sdkp->device;
242 if (!capable(CAP_SYS_ADMIN))
243 return -EACCES;
245 if (sdp->type != TYPE_DISK)
246 return -EINVAL;
248 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
250 return count;
252 static DEVICE_ATTR_RW(allow_restart);
254 static ssize_t
255 cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
257 struct scsi_disk *sdkp = to_scsi_disk(dev);
258 int ct = sdkp->RCD + 2*sdkp->WCE;
260 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
262 static DEVICE_ATTR_RW(cache_type);
264 static ssize_t
265 FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
267 struct scsi_disk *sdkp = to_scsi_disk(dev);
269 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
271 static DEVICE_ATTR_RO(FUA);
273 static ssize_t
274 protection_type_show(struct device *dev, struct device_attribute *attr,
275 char *buf)
277 struct scsi_disk *sdkp = to_scsi_disk(dev);
279 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
282 static ssize_t
283 protection_type_store(struct device *dev, struct device_attribute *attr,
284 const char *buf, size_t count)
286 struct scsi_disk *sdkp = to_scsi_disk(dev);
287 unsigned int val;
288 int err;
290 if (!capable(CAP_SYS_ADMIN))
291 return -EACCES;
293 err = kstrtouint(buf, 10, &val);
295 if (err)
296 return err;
298 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
299 sdkp->protection_type = val;
301 return count;
303 static DEVICE_ATTR_RW(protection_type);
305 static ssize_t
306 protection_mode_show(struct device *dev, struct device_attribute *attr,
307 char *buf)
309 struct scsi_disk *sdkp = to_scsi_disk(dev);
310 struct scsi_device *sdp = sdkp->device;
311 unsigned int dif, dix;
313 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
314 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
316 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
317 dif = 0;
318 dix = 1;
321 if (!dif && !dix)
322 return snprintf(buf, 20, "none\n");
324 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
326 static DEVICE_ATTR_RO(protection_mode);
328 static ssize_t
329 app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
331 struct scsi_disk *sdkp = to_scsi_disk(dev);
333 return snprintf(buf, 20, "%u\n", sdkp->ATO);
335 static DEVICE_ATTR_RO(app_tag_own);
337 static ssize_t
338 thin_provisioning_show(struct device *dev, struct device_attribute *attr,
339 char *buf)
341 struct scsi_disk *sdkp = to_scsi_disk(dev);
343 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
345 static DEVICE_ATTR_RO(thin_provisioning);
347 static const char *lbp_mode[] = {
348 [SD_LBP_FULL] = "full",
349 [SD_LBP_UNMAP] = "unmap",
350 [SD_LBP_WS16] = "writesame_16",
351 [SD_LBP_WS10] = "writesame_10",
352 [SD_LBP_ZERO] = "writesame_zero",
353 [SD_LBP_DISABLE] = "disabled",
356 static ssize_t
357 provisioning_mode_show(struct device *dev, struct device_attribute *attr,
358 char *buf)
360 struct scsi_disk *sdkp = to_scsi_disk(dev);
362 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
365 static ssize_t
366 provisioning_mode_store(struct device *dev, struct device_attribute *attr,
367 const char *buf, size_t count)
369 struct scsi_disk *sdkp = to_scsi_disk(dev);
370 struct scsi_device *sdp = sdkp->device;
372 if (!capable(CAP_SYS_ADMIN))
373 return -EACCES;
375 if (sdp->type != TYPE_DISK)
376 return -EINVAL;
378 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
379 sd_config_discard(sdkp, SD_LBP_UNMAP);
380 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
381 sd_config_discard(sdkp, SD_LBP_WS16);
382 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
383 sd_config_discard(sdkp, SD_LBP_WS10);
384 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
385 sd_config_discard(sdkp, SD_LBP_ZERO);
386 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
387 sd_config_discard(sdkp, SD_LBP_DISABLE);
388 else
389 return -EINVAL;
391 return count;
393 static DEVICE_ATTR_RW(provisioning_mode);
395 static ssize_t
396 max_medium_access_timeouts_show(struct device *dev,
397 struct device_attribute *attr, char *buf)
399 struct scsi_disk *sdkp = to_scsi_disk(dev);
401 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
404 static ssize_t
405 max_medium_access_timeouts_store(struct device *dev,
406 struct device_attribute *attr, const char *buf,
407 size_t count)
409 struct scsi_disk *sdkp = to_scsi_disk(dev);
410 int err;
412 if (!capable(CAP_SYS_ADMIN))
413 return -EACCES;
415 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
417 return err ? err : count;
419 static DEVICE_ATTR_RW(max_medium_access_timeouts);
421 static ssize_t
422 max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
423 char *buf)
425 struct scsi_disk *sdkp = to_scsi_disk(dev);
427 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
430 static ssize_t
431 max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
432 const char *buf, size_t count)
434 struct scsi_disk *sdkp = to_scsi_disk(dev);
435 struct scsi_device *sdp = sdkp->device;
436 unsigned long max;
437 int err;
439 if (!capable(CAP_SYS_ADMIN))
440 return -EACCES;
442 if (sdp->type != TYPE_DISK)
443 return -EINVAL;
445 err = kstrtoul(buf, 10, &max);
447 if (err)
448 return err;
450 if (max == 0)
451 sdp->no_write_same = 1;
452 else if (max <= SD_MAX_WS16_BLOCKS) {
453 sdp->no_write_same = 0;
454 sdkp->max_ws_blocks = max;
457 sd_config_write_same(sdkp);
459 return count;
461 static DEVICE_ATTR_RW(max_write_same_blocks);
463 static struct attribute *sd_disk_attrs[] = {
464 &dev_attr_cache_type.attr,
465 &dev_attr_FUA.attr,
466 &dev_attr_allow_restart.attr,
467 &dev_attr_manage_start_stop.attr,
468 &dev_attr_protection_type.attr,
469 &dev_attr_protection_mode.attr,
470 &dev_attr_app_tag_own.attr,
471 &dev_attr_thin_provisioning.attr,
472 &dev_attr_provisioning_mode.attr,
473 &dev_attr_max_write_same_blocks.attr,
474 &dev_attr_max_medium_access_timeouts.attr,
475 NULL,
477 ATTRIBUTE_GROUPS(sd_disk);
479 static struct class sd_disk_class = {
480 .name = "scsi_disk",
481 .owner = THIS_MODULE,
482 .dev_release = scsi_disk_release,
483 .dev_groups = sd_disk_groups,
486 static const struct dev_pm_ops sd_pm_ops = {
487 .suspend = sd_suspend,
488 .resume = sd_resume,
489 .poweroff = sd_suspend,
490 .restore = sd_resume,
491 .runtime_suspend = sd_suspend,
492 .runtime_resume = sd_resume,
495 static struct scsi_driver sd_template = {
496 .owner = THIS_MODULE,
497 .gendrv = {
498 .name = "sd",
499 .probe = sd_probe,
500 .remove = sd_remove,
501 .shutdown = sd_shutdown,
502 .pm = &sd_pm_ops,
504 .rescan = sd_rescan,
505 .done = sd_done,
506 .eh_action = sd_eh_action,
510 * Dummy kobj_map->probe function.
511 * The default ->probe function will call modprobe, which is
512 * pointless as this module is already loaded.
514 static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
516 return NULL;
520 * Device no to disk mapping:
522 * major disc2 disc p1
523 * |............|.............|....|....| <- dev_t
524 * 31 20 19 8 7 4 3 0
526 * Inside a major, we have 16k disks, however mapped non-
527 * contiguously. The first 16 disks are for major0, the next
528 * ones with major1, ... Disk 256 is for major0 again, disk 272
529 * for major1, ...
530 * As we stay compatible with our numbering scheme, we can reuse
531 * the well-know SCSI majors 8, 65--71, 136--143.
533 static int sd_major(int major_idx)
535 switch (major_idx) {
536 case 0:
537 return SCSI_DISK0_MAJOR;
538 case 1 ... 7:
539 return SCSI_DISK1_MAJOR + major_idx - 1;
540 case 8 ... 15:
541 return SCSI_DISK8_MAJOR + major_idx - 8;
542 default:
543 BUG();
544 return 0; /* shut up gcc */
548 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
550 struct scsi_disk *sdkp = NULL;
552 if (disk->private_data) {
553 sdkp = scsi_disk(disk);
554 if (scsi_device_get(sdkp->device) == 0)
555 get_device(&sdkp->dev);
556 else
557 sdkp = NULL;
559 return sdkp;
562 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
564 struct scsi_disk *sdkp;
566 mutex_lock(&sd_ref_mutex);
567 sdkp = __scsi_disk_get(disk);
568 mutex_unlock(&sd_ref_mutex);
569 return sdkp;
572 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
574 struct scsi_disk *sdkp;
576 mutex_lock(&sd_ref_mutex);
577 sdkp = dev_get_drvdata(dev);
578 if (sdkp)
579 sdkp = __scsi_disk_get(sdkp->disk);
580 mutex_unlock(&sd_ref_mutex);
581 return sdkp;
584 static void scsi_disk_put(struct scsi_disk *sdkp)
586 struct scsi_device *sdev = sdkp->device;
588 mutex_lock(&sd_ref_mutex);
589 put_device(&sdkp->dev);
590 scsi_device_put(sdev);
591 mutex_unlock(&sd_ref_mutex);
594 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
596 unsigned int prot_op = SCSI_PROT_NORMAL;
597 unsigned int dix = scsi_prot_sg_count(scmd);
599 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
600 if (dif && dix)
601 prot_op = SCSI_PROT_READ_PASS;
602 else if (dif && !dix)
603 prot_op = SCSI_PROT_READ_STRIP;
604 else if (!dif && dix)
605 prot_op = SCSI_PROT_READ_INSERT;
606 } else {
607 if (dif && dix)
608 prot_op = SCSI_PROT_WRITE_PASS;
609 else if (dif && !dix)
610 prot_op = SCSI_PROT_WRITE_INSERT;
611 else if (!dif && dix)
612 prot_op = SCSI_PROT_WRITE_STRIP;
615 scsi_set_prot_op(scmd, prot_op);
616 scsi_set_prot_type(scmd, dif);
619 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
621 struct request_queue *q = sdkp->disk->queue;
622 unsigned int logical_block_size = sdkp->device->sector_size;
623 unsigned int max_blocks = 0;
625 q->limits.discard_zeroes_data = sdkp->lbprz;
626 q->limits.discard_alignment = sdkp->unmap_alignment *
627 logical_block_size;
628 q->limits.discard_granularity =
629 max(sdkp->physical_block_size,
630 sdkp->unmap_granularity * logical_block_size);
632 sdkp->provisioning_mode = mode;
634 switch (mode) {
636 case SD_LBP_DISABLE:
637 q->limits.max_discard_sectors = 0;
638 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
639 return;
641 case SD_LBP_UNMAP:
642 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
643 (u32)SD_MAX_WS16_BLOCKS);
644 break;
646 case SD_LBP_WS16:
647 max_blocks = min_not_zero(sdkp->max_ws_blocks,
648 (u32)SD_MAX_WS16_BLOCKS);
649 break;
651 case SD_LBP_WS10:
652 max_blocks = min_not_zero(sdkp->max_ws_blocks,
653 (u32)SD_MAX_WS10_BLOCKS);
654 break;
656 case SD_LBP_ZERO:
657 max_blocks = min_not_zero(sdkp->max_ws_blocks,
658 (u32)SD_MAX_WS10_BLOCKS);
659 q->limits.discard_zeroes_data = 1;
660 break;
663 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
664 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
668 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
669 * @sdp: scsi device to operate one
670 * @rq: Request to prepare
672 * Will issue either UNMAP or WRITE SAME(16) depending on preference
673 * indicated by target device.
675 static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
677 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
678 sector_t sector = blk_rq_pos(rq);
679 unsigned int nr_sectors = blk_rq_sectors(rq);
680 unsigned int nr_bytes = blk_rq_bytes(rq);
681 unsigned int len;
682 int ret;
683 char *buf;
684 struct page *page;
686 sector >>= ilog2(sdp->sector_size) - 9;
687 nr_sectors >>= ilog2(sdp->sector_size) - 9;
688 rq->timeout = SD_TIMEOUT;
690 memset(rq->cmd, 0, rq->cmd_len);
692 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
693 if (!page)
694 return BLKPREP_DEFER;
696 switch (sdkp->provisioning_mode) {
697 case SD_LBP_UNMAP:
698 buf = page_address(page);
700 rq->cmd_len = 10;
701 rq->cmd[0] = UNMAP;
702 rq->cmd[8] = 24;
704 put_unaligned_be16(6 + 16, &buf[0]);
705 put_unaligned_be16(16, &buf[2]);
706 put_unaligned_be64(sector, &buf[8]);
707 put_unaligned_be32(nr_sectors, &buf[16]);
709 len = 24;
710 break;
712 case SD_LBP_WS16:
713 rq->cmd_len = 16;
714 rq->cmd[0] = WRITE_SAME_16;
715 rq->cmd[1] = 0x8; /* UNMAP */
716 put_unaligned_be64(sector, &rq->cmd[2]);
717 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
719 len = sdkp->device->sector_size;
720 break;
722 case SD_LBP_WS10:
723 case SD_LBP_ZERO:
724 rq->cmd_len = 10;
725 rq->cmd[0] = WRITE_SAME;
726 if (sdkp->provisioning_mode == SD_LBP_WS10)
727 rq->cmd[1] = 0x8; /* UNMAP */
728 put_unaligned_be32(sector, &rq->cmd[2]);
729 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
731 len = sdkp->device->sector_size;
732 break;
734 default:
735 ret = BLKPREP_KILL;
736 goto out;
739 blk_add_request_payload(rq, page, len);
740 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
741 rq->buffer = page_address(page);
742 rq->__data_len = nr_bytes;
744 out:
745 if (ret != BLKPREP_OK) {
746 __free_page(page);
747 rq->buffer = NULL;
749 return ret;
752 static void sd_config_write_same(struct scsi_disk *sdkp)
754 struct request_queue *q = sdkp->disk->queue;
755 unsigned int logical_block_size = sdkp->device->sector_size;
757 if (sdkp->device->no_write_same) {
758 sdkp->max_ws_blocks = 0;
759 goto out;
762 /* Some devices can not handle block counts above 0xffff despite
763 * supporting WRITE SAME(16). Consequently we default to 64k
764 * blocks per I/O unless the device explicitly advertises a
765 * bigger limit.
767 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
768 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
769 (u32)SD_MAX_WS16_BLOCKS);
770 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
771 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
772 (u32)SD_MAX_WS10_BLOCKS);
773 else {
774 sdkp->device->no_write_same = 1;
775 sdkp->max_ws_blocks = 0;
778 out:
779 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
780 (logical_block_size >> 9));
784 * sd_setup_write_same_cmnd - write the same data to multiple blocks
785 * @sdp: scsi device to operate one
786 * @rq: Request to prepare
788 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
789 * preference indicated by target device.
791 static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
793 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
794 struct bio *bio = rq->bio;
795 sector_t sector = blk_rq_pos(rq);
796 unsigned int nr_sectors = blk_rq_sectors(rq);
797 unsigned int nr_bytes = blk_rq_bytes(rq);
798 int ret;
800 if (sdkp->device->no_write_same)
801 return BLKPREP_KILL;
803 BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size);
805 sector >>= ilog2(sdp->sector_size) - 9;
806 nr_sectors >>= ilog2(sdp->sector_size) - 9;
808 rq->__data_len = sdp->sector_size;
809 rq->timeout = SD_WRITE_SAME_TIMEOUT;
810 memset(rq->cmd, 0, rq->cmd_len);
812 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
813 rq->cmd_len = 16;
814 rq->cmd[0] = WRITE_SAME_16;
815 put_unaligned_be64(sector, &rq->cmd[2]);
816 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
817 } else {
818 rq->cmd_len = 10;
819 rq->cmd[0] = WRITE_SAME;
820 put_unaligned_be32(sector, &rq->cmd[2]);
821 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
824 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
825 rq->__data_len = nr_bytes;
827 return ret;
830 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
832 rq->timeout = SD_FLUSH_TIMEOUT;
833 rq->retries = SD_MAX_RETRIES;
834 rq->cmd[0] = SYNCHRONIZE_CACHE;
835 rq->cmd_len = 10;
837 return scsi_setup_blk_pc_cmnd(sdp, rq);
840 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
842 struct scsi_cmnd *SCpnt = rq->special;
844 if (rq->cmd_flags & REQ_DISCARD) {
845 free_page((unsigned long)rq->buffer);
846 rq->buffer = NULL;
848 if (SCpnt->cmnd != rq->cmd) {
849 mempool_free(SCpnt->cmnd, sd_cdb_pool);
850 SCpnt->cmnd = NULL;
851 SCpnt->cmd_len = 0;
856 * sd_prep_fn - build a scsi (read or write) command from
857 * information in the request structure.
858 * @SCpnt: pointer to mid-level's per scsi command structure that
859 * contains request and into which the scsi command is written
861 * Returns 1 if successful and 0 if error (or cannot be done now).
863 static int sd_prep_fn(struct request_queue *q, struct request *rq)
865 struct scsi_cmnd *SCpnt;
866 struct scsi_device *sdp = q->queuedata;
867 struct gendisk *disk = rq->rq_disk;
868 struct scsi_disk *sdkp;
869 sector_t block = blk_rq_pos(rq);
870 sector_t threshold;
871 unsigned int this_count = blk_rq_sectors(rq);
872 int ret, host_dif;
873 unsigned char protect;
876 * Discard request come in as REQ_TYPE_FS but we turn them into
877 * block PC requests to make life easier.
879 if (rq->cmd_flags & REQ_DISCARD) {
880 ret = sd_setup_discard_cmnd(sdp, rq);
881 goto out;
882 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
883 ret = sd_setup_write_same_cmnd(sdp, rq);
884 goto out;
885 } else if (rq->cmd_flags & REQ_FLUSH) {
886 ret = scsi_setup_flush_cmnd(sdp, rq);
887 goto out;
888 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
889 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
890 goto out;
891 } else if (rq->cmd_type != REQ_TYPE_FS) {
892 ret = BLKPREP_KILL;
893 goto out;
895 ret = scsi_setup_fs_cmnd(sdp, rq);
896 if (ret != BLKPREP_OK)
897 goto out;
898 SCpnt = rq->special;
899 sdkp = scsi_disk(disk);
901 /* from here on until we're complete, any goto out
902 * is used for a killable error condition */
903 ret = BLKPREP_KILL;
905 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
906 "sd_prep_fn: block=%llu, "
907 "count=%d\n",
908 (unsigned long long)block,
909 this_count));
911 if (!sdp || !scsi_device_online(sdp) ||
912 block + blk_rq_sectors(rq) > get_capacity(disk)) {
913 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
914 "Finishing %u sectors\n",
915 blk_rq_sectors(rq)));
916 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
917 "Retry with 0x%p\n", SCpnt));
918 goto out;
921 if (sdp->changed) {
923 * quietly refuse to do anything to a changed disc until
924 * the changed bit has been reset
926 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
927 goto out;
931 * Some SD card readers can't handle multi-sector accesses which touch
932 * the last one or two hardware sectors. Split accesses as needed.
934 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
935 (sdp->sector_size / 512);
937 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
938 if (block < threshold) {
939 /* Access up to the threshold but not beyond */
940 this_count = threshold - block;
941 } else {
942 /* Access only a single hardware sector */
943 this_count = sdp->sector_size / 512;
947 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
948 (unsigned long long)block));
951 * If we have a 1K hardware sectorsize, prevent access to single
952 * 512 byte sectors. In theory we could handle this - in fact
953 * the scsi cdrom driver must be able to handle this because
954 * we typically use 1K blocksizes, and cdroms typically have
955 * 2K hardware sectorsizes. Of course, things are simpler
956 * with the cdrom, since it is read-only. For performance
957 * reasons, the filesystems should be able to handle this
958 * and not force the scsi disk driver to use bounce buffers
959 * for this.
961 if (sdp->sector_size == 1024) {
962 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
963 scmd_printk(KERN_ERR, SCpnt,
964 "Bad block number requested\n");
965 goto out;
966 } else {
967 block = block >> 1;
968 this_count = this_count >> 1;
971 if (sdp->sector_size == 2048) {
972 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
973 scmd_printk(KERN_ERR, SCpnt,
974 "Bad block number requested\n");
975 goto out;
976 } else {
977 block = block >> 2;
978 this_count = this_count >> 2;
981 if (sdp->sector_size == 4096) {
982 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
983 scmd_printk(KERN_ERR, SCpnt,
984 "Bad block number requested\n");
985 goto out;
986 } else {
987 block = block >> 3;
988 this_count = this_count >> 3;
991 if (rq_data_dir(rq) == WRITE) {
992 if (!sdp->writeable) {
993 goto out;
995 SCpnt->cmnd[0] = WRITE_6;
996 SCpnt->sc_data_direction = DMA_TO_DEVICE;
998 if (blk_integrity_rq(rq))
999 sd_dif_prepare(rq, block, sdp->sector_size);
1001 } else if (rq_data_dir(rq) == READ) {
1002 SCpnt->cmnd[0] = READ_6;
1003 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
1004 } else {
1005 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
1006 goto out;
1009 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1010 "%s %d/%u 512 byte blocks.\n",
1011 (rq_data_dir(rq) == WRITE) ?
1012 "writing" : "reading", this_count,
1013 blk_rq_sectors(rq)));
1015 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
1016 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
1017 if (host_dif)
1018 protect = 1 << 5;
1019 else
1020 protect = 0;
1022 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1023 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1025 if (unlikely(SCpnt->cmnd == NULL)) {
1026 ret = BLKPREP_DEFER;
1027 goto out;
1030 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1031 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1032 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1033 SCpnt->cmnd[7] = 0x18;
1034 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1035 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1037 /* LBA */
1038 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1039 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1040 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1041 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1042 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1043 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1044 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1045 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1047 /* Expected Indirect LBA */
1048 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1049 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1050 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1051 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1053 /* Transfer length */
1054 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1055 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1056 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1057 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1058 } else if (sdp->use_16_for_rw) {
1059 SCpnt->cmnd[0] += READ_16 - READ_6;
1060 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1061 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1062 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1063 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1064 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1065 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1066 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1067 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1068 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1069 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1070 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1071 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1072 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1073 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1074 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1075 scsi_device_protection(SCpnt->device) ||
1076 SCpnt->device->use_10_for_rw) {
1077 if (this_count > 0xffff)
1078 this_count = 0xffff;
1080 SCpnt->cmnd[0] += READ_10 - READ_6;
1081 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1082 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1083 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1084 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1085 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1086 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1087 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1088 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1089 } else {
1090 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1092 * This happens only if this drive failed
1093 * 10byte rw command with ILLEGAL_REQUEST
1094 * during operation and thus turned off
1095 * use_10_for_rw.
1097 scmd_printk(KERN_ERR, SCpnt,
1098 "FUA write on READ/WRITE(6) drive\n");
1099 goto out;
1102 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1103 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1104 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1105 SCpnt->cmnd[4] = (unsigned char) this_count;
1106 SCpnt->cmnd[5] = 0;
1108 SCpnt->sdb.length = this_count * sdp->sector_size;
1110 /* If DIF or DIX is enabled, tell HBA how to handle request */
1111 if (host_dif || scsi_prot_sg_count(SCpnt))
1112 sd_prot_op(SCpnt, host_dif);
1115 * We shouldn't disconnect in the middle of a sector, so with a dumb
1116 * host adapter, it's safe to assume that we can at least transfer
1117 * this many bytes between each connect / disconnect.
1119 SCpnt->transfersize = sdp->sector_size;
1120 SCpnt->underflow = this_count << 9;
1121 SCpnt->allowed = SD_MAX_RETRIES;
1124 * This indicates that the command is ready from our end to be
1125 * queued.
1127 ret = BLKPREP_OK;
1128 out:
1129 return scsi_prep_return(q, rq, ret);
1133 * sd_open - open a scsi disk device
1134 * @inode: only i_rdev member may be used
1135 * @filp: only f_mode and f_flags may be used
1137 * Returns 0 if successful. Returns a negated errno value in case
1138 * of error.
1140 * Note: This can be called from a user context (e.g. fsck(1) )
1141 * or from within the kernel (e.g. as a result of a mount(1) ).
1142 * In the latter case @inode and @filp carry an abridged amount
1143 * of information as noted above.
1145 * Locking: called with bdev->bd_mutex held.
1147 static int sd_open(struct block_device *bdev, fmode_t mode)
1149 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1150 struct scsi_device *sdev;
1151 int retval;
1153 if (!sdkp)
1154 return -ENXIO;
1156 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1158 sdev = sdkp->device;
1161 * If the device is in error recovery, wait until it is done.
1162 * If the device is offline, then disallow any access to it.
1164 retval = -ENXIO;
1165 if (!scsi_block_when_processing_errors(sdev))
1166 goto error_out;
1168 if (sdev->removable || sdkp->write_prot)
1169 check_disk_change(bdev);
1172 * If the drive is empty, just let the open fail.
1174 retval = -ENOMEDIUM;
1175 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1176 goto error_out;
1179 * If the device has the write protect tab set, have the open fail
1180 * if the user expects to be able to write to the thing.
1182 retval = -EROFS;
1183 if (sdkp->write_prot && (mode & FMODE_WRITE))
1184 goto error_out;
1187 * It is possible that the disk changing stuff resulted in
1188 * the device being taken offline. If this is the case,
1189 * report this to the user, and don't pretend that the
1190 * open actually succeeded.
1192 retval = -ENXIO;
1193 if (!scsi_device_online(sdev))
1194 goto error_out;
1196 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1197 if (scsi_block_when_processing_errors(sdev))
1198 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1201 return 0;
1203 error_out:
1204 scsi_disk_put(sdkp);
1205 return retval;
1209 * sd_release - invoked when the (last) close(2) is called on this
1210 * scsi disk.
1211 * @inode: only i_rdev member may be used
1212 * @filp: only f_mode and f_flags may be used
1214 * Returns 0.
1216 * Note: may block (uninterruptible) if error recovery is underway
1217 * on this disk.
1219 * Locking: called with bdev->bd_mutex held.
1221 static void sd_release(struct gendisk *disk, fmode_t mode)
1223 struct scsi_disk *sdkp = scsi_disk(disk);
1224 struct scsi_device *sdev = sdkp->device;
1226 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1228 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1229 if (scsi_block_when_processing_errors(sdev))
1230 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1234 * XXX and what if there are packets in flight and this close()
1235 * XXX is followed by a "rmmod sd_mod"?
1238 scsi_disk_put(sdkp);
1241 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1243 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1244 struct scsi_device *sdp = sdkp->device;
1245 struct Scsi_Host *host = sdp->host;
1246 int diskinfo[4];
1248 /* default to most commonly used values */
1249 diskinfo[0] = 0x40; /* 1 << 6 */
1250 diskinfo[1] = 0x20; /* 1 << 5 */
1251 diskinfo[2] = sdkp->capacity >> 11;
1253 /* override with calculated, extended default, or driver values */
1254 if (host->hostt->bios_param)
1255 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1256 else
1257 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1259 geo->heads = diskinfo[0];
1260 geo->sectors = diskinfo[1];
1261 geo->cylinders = diskinfo[2];
1262 return 0;
1266 * sd_ioctl - process an ioctl
1267 * @inode: only i_rdev/i_bdev members may be used
1268 * @filp: only f_mode and f_flags may be used
1269 * @cmd: ioctl command number
1270 * @arg: this is third argument given to ioctl(2) system call.
1271 * Often contains a pointer.
1273 * Returns 0 if successful (some ioctls return positive numbers on
1274 * success as well). Returns a negated errno value in case of error.
1276 * Note: most ioctls are forward onto the block subsystem or further
1277 * down in the scsi subsystem.
1279 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1280 unsigned int cmd, unsigned long arg)
1282 struct gendisk *disk = bdev->bd_disk;
1283 struct scsi_disk *sdkp = scsi_disk(disk);
1284 struct scsi_device *sdp = sdkp->device;
1285 void __user *p = (void __user *)arg;
1286 int error;
1288 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1289 "cmd=0x%x\n", disk->disk_name, cmd));
1291 error = scsi_verify_blk_ioctl(bdev, cmd);
1292 if (error < 0)
1293 return error;
1296 * If we are in the middle of error recovery, don't let anyone
1297 * else try and use this device. Also, if error recovery fails, it
1298 * may try and take the device offline, in which case all further
1299 * access to the device is prohibited.
1301 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1302 (mode & FMODE_NDELAY) != 0);
1303 if (!scsi_block_when_processing_errors(sdp) || !error)
1304 goto out;
1307 * Send SCSI addressing ioctls directly to mid level, send other
1308 * ioctls to block level and then onto mid level if they can't be
1309 * resolved.
1311 switch (cmd) {
1312 case SCSI_IOCTL_GET_IDLUN:
1313 case SCSI_IOCTL_GET_BUS_NUMBER:
1314 error = scsi_ioctl(sdp, cmd, p);
1315 break;
1316 default:
1317 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1318 if (error != -ENOTTY)
1319 break;
1320 error = scsi_ioctl(sdp, cmd, p);
1321 break;
1323 out:
1324 return error;
1327 static void set_media_not_present(struct scsi_disk *sdkp)
1329 if (sdkp->media_present)
1330 sdkp->device->changed = 1;
1332 if (sdkp->device->removable) {
1333 sdkp->media_present = 0;
1334 sdkp->capacity = 0;
1338 static int media_not_present(struct scsi_disk *sdkp,
1339 struct scsi_sense_hdr *sshdr)
1341 if (!scsi_sense_valid(sshdr))
1342 return 0;
1344 /* not invoked for commands that could return deferred errors */
1345 switch (sshdr->sense_key) {
1346 case UNIT_ATTENTION:
1347 case NOT_READY:
1348 /* medium not present */
1349 if (sshdr->asc == 0x3A) {
1350 set_media_not_present(sdkp);
1351 return 1;
1354 return 0;
1358 * sd_check_events - check media events
1359 * @disk: kernel device descriptor
1360 * @clearing: disk events currently being cleared
1362 * Returns mask of DISK_EVENT_*.
1364 * Note: this function is invoked from the block subsystem.
1366 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1368 struct scsi_disk *sdkp = scsi_disk(disk);
1369 struct scsi_device *sdp = sdkp->device;
1370 struct scsi_sense_hdr *sshdr = NULL;
1371 int retval;
1373 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1376 * If the device is offline, don't send any commands - just pretend as
1377 * if the command failed. If the device ever comes back online, we
1378 * can deal with it then. It is only because of unrecoverable errors
1379 * that we would ever take a device offline in the first place.
1381 if (!scsi_device_online(sdp)) {
1382 set_media_not_present(sdkp);
1383 goto out;
1387 * Using TEST_UNIT_READY enables differentiation between drive with
1388 * no cartridge loaded - NOT READY, drive with changed cartridge -
1389 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1391 * Drives that auto spin down. eg iomega jaz 1G, will be started
1392 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1393 * sd_revalidate() is called.
1395 retval = -ENODEV;
1397 if (scsi_block_when_processing_errors(sdp)) {
1398 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1399 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1400 sshdr);
1403 /* failed to execute TUR, assume media not present */
1404 if (host_byte(retval)) {
1405 set_media_not_present(sdkp);
1406 goto out;
1409 if (media_not_present(sdkp, sshdr))
1410 goto out;
1413 * For removable scsi disk we have to recognise the presence
1414 * of a disk in the drive.
1416 if (!sdkp->media_present)
1417 sdp->changed = 1;
1418 sdkp->media_present = 1;
1419 out:
1421 * sdp->changed is set under the following conditions:
1423 * Medium present state has changed in either direction.
1424 * Device has indicated UNIT_ATTENTION.
1426 kfree(sshdr);
1427 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1428 sdp->changed = 0;
1429 return retval;
1432 static int sd_sync_cache(struct scsi_disk *sdkp)
1434 int retries, res;
1435 struct scsi_device *sdp = sdkp->device;
1436 struct scsi_sense_hdr sshdr;
1438 if (!scsi_device_online(sdp))
1439 return -ENODEV;
1442 for (retries = 3; retries > 0; --retries) {
1443 unsigned char cmd[10] = { 0 };
1445 cmd[0] = SYNCHRONIZE_CACHE;
1447 * Leave the rest of the command zero to indicate
1448 * flush everything.
1450 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1451 &sshdr, SD_FLUSH_TIMEOUT,
1452 SD_MAX_RETRIES, NULL, REQ_PM);
1453 if (res == 0)
1454 break;
1457 if (res) {
1458 sd_print_result(sdkp, res);
1459 if (driver_byte(res) & DRIVER_SENSE)
1460 sd_print_sense_hdr(sdkp, &sshdr);
1463 if (res)
1464 return -EIO;
1465 return 0;
1468 static void sd_rescan(struct device *dev)
1470 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1472 if (sdkp) {
1473 revalidate_disk(sdkp->disk);
1474 scsi_disk_put(sdkp);
1479 #ifdef CONFIG_COMPAT
1481 * This gets directly called from VFS. When the ioctl
1482 * is not recognized we go back to the other translation paths.
1484 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1485 unsigned int cmd, unsigned long arg)
1487 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1488 int ret;
1490 ret = scsi_verify_blk_ioctl(bdev, cmd);
1491 if (ret < 0)
1492 return ret;
1495 * If we are in the middle of error recovery, don't let anyone
1496 * else try and use this device. Also, if error recovery fails, it
1497 * may try and take the device offline, in which case all further
1498 * access to the device is prohibited.
1500 if (!scsi_block_when_processing_errors(sdev))
1501 return -ENODEV;
1503 if (sdev->host->hostt->compat_ioctl) {
1504 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1506 return ret;
1510 * Let the static ioctl translation table take care of it.
1512 return -ENOIOCTLCMD;
1514 #endif
1516 static const struct block_device_operations sd_fops = {
1517 .owner = THIS_MODULE,
1518 .open = sd_open,
1519 .release = sd_release,
1520 .ioctl = sd_ioctl,
1521 .getgeo = sd_getgeo,
1522 #ifdef CONFIG_COMPAT
1523 .compat_ioctl = sd_compat_ioctl,
1524 #endif
1525 .check_events = sd_check_events,
1526 .revalidate_disk = sd_revalidate_disk,
1527 .unlock_native_capacity = sd_unlock_native_capacity,
1531 * sd_eh_action - error handling callback
1532 * @scmd: sd-issued command that has failed
1533 * @eh_cmnd: The command that was sent during error handling
1534 * @eh_cmnd_len: Length of eh_cmnd in bytes
1535 * @eh_disp: The recovery disposition suggested by the midlayer
1537 * This function is called by the SCSI midlayer upon completion of
1538 * an error handling command (TEST UNIT READY, START STOP UNIT,
1539 * etc.) The command sent to the device by the error handler is
1540 * stored in eh_cmnd. The result of sending the eh command is
1541 * passed in eh_disp.
1543 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1544 int eh_cmnd_len, int eh_disp)
1546 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1548 if (!scsi_device_online(scmd->device) ||
1549 !scsi_medium_access_command(scmd))
1550 return eh_disp;
1553 * The device has timed out executing a medium access command.
1554 * However, the TEST UNIT READY command sent during error
1555 * handling completed successfully. Either the device is in the
1556 * process of recovering or has it suffered an internal failure
1557 * that prevents access to the storage medium.
1559 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1560 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1561 sdkp->medium_access_timed_out++;
1564 * If the device keeps failing read/write commands but TEST UNIT
1565 * READY always completes successfully we assume that medium
1566 * access is no longer possible and take the device offline.
1568 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1569 scmd_printk(KERN_ERR, scmd,
1570 "Medium access timeout failure. Offlining disk!\n");
1571 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1573 return FAILED;
1576 return eh_disp;
1579 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1581 u64 start_lba = blk_rq_pos(scmd->request);
1582 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1583 u64 factor = scmd->device->sector_size / 512;
1584 u64 bad_lba;
1585 int info_valid;
1587 * resid is optional but mostly filled in. When it's unused,
1588 * its value is zero, so we assume the whole buffer transferred
1590 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1591 unsigned int good_bytes;
1593 if (scmd->request->cmd_type != REQ_TYPE_FS)
1594 return 0;
1596 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1597 SCSI_SENSE_BUFFERSIZE,
1598 &bad_lba);
1599 if (!info_valid)
1600 return 0;
1602 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1603 return 0;
1605 /* be careful ... don't want any overflows */
1606 do_div(start_lba, factor);
1607 do_div(end_lba, factor);
1609 /* The bad lba was reported incorrectly, we have no idea where
1610 * the error is.
1612 if (bad_lba < start_lba || bad_lba >= end_lba)
1613 return 0;
1615 /* This computation should always be done in terms of
1616 * the resolution of the device's medium.
1618 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1619 return min(good_bytes, transferred);
1623 * sd_done - bottom half handler: called when the lower level
1624 * driver has completed (successfully or otherwise) a scsi command.
1625 * @SCpnt: mid-level's per command structure.
1627 * Note: potentially run from within an ISR. Must not block.
1629 static int sd_done(struct scsi_cmnd *SCpnt)
1631 int result = SCpnt->result;
1632 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1633 struct scsi_sense_hdr sshdr;
1634 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1635 struct request *req = SCpnt->request;
1636 int sense_valid = 0;
1637 int sense_deferred = 0;
1638 unsigned char op = SCpnt->cmnd[0];
1639 unsigned char unmap = SCpnt->cmnd[1] & 8;
1641 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1642 if (!result) {
1643 good_bytes = blk_rq_bytes(req);
1644 scsi_set_resid(SCpnt, 0);
1645 } else {
1646 good_bytes = 0;
1647 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1651 if (result) {
1652 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1653 if (sense_valid)
1654 sense_deferred = scsi_sense_is_deferred(&sshdr);
1656 #ifdef CONFIG_SCSI_LOGGING
1657 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1658 if (sense_valid) {
1659 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1660 "sd_done: sb[respc,sk,asc,"
1661 "ascq]=%x,%x,%x,%x\n",
1662 sshdr.response_code,
1663 sshdr.sense_key, sshdr.asc,
1664 sshdr.ascq));
1666 #endif
1667 if (driver_byte(result) != DRIVER_SENSE &&
1668 (!sense_valid || sense_deferred))
1669 goto out;
1671 sdkp->medium_access_timed_out = 0;
1673 switch (sshdr.sense_key) {
1674 case HARDWARE_ERROR:
1675 case MEDIUM_ERROR:
1676 good_bytes = sd_completed_bytes(SCpnt);
1677 break;
1678 case RECOVERED_ERROR:
1679 good_bytes = scsi_bufflen(SCpnt);
1680 break;
1681 case NO_SENSE:
1682 /* This indicates a false check condition, so ignore it. An
1683 * unknown amount of data was transferred so treat it as an
1684 * error.
1686 scsi_print_sense("sd", SCpnt);
1687 SCpnt->result = 0;
1688 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1689 break;
1690 case ABORTED_COMMAND:
1691 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1692 good_bytes = sd_completed_bytes(SCpnt);
1693 break;
1694 case ILLEGAL_REQUEST:
1695 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1696 good_bytes = sd_completed_bytes(SCpnt);
1697 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1698 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1699 switch (op) {
1700 case UNMAP:
1701 sd_config_discard(sdkp, SD_LBP_DISABLE);
1702 break;
1703 case WRITE_SAME_16:
1704 case WRITE_SAME:
1705 if (unmap)
1706 sd_config_discard(sdkp, SD_LBP_DISABLE);
1707 else {
1708 sdkp->device->no_write_same = 1;
1709 sd_config_write_same(sdkp);
1711 good_bytes = 0;
1712 req->__data_len = blk_rq_bytes(req);
1713 req->cmd_flags |= REQ_QUIET;
1717 break;
1718 default:
1719 break;
1721 out:
1722 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1723 sd_dif_complete(SCpnt, good_bytes);
1725 return good_bytes;
1729 * spinup disk - called only in sd_revalidate_disk()
1731 static void
1732 sd_spinup_disk(struct scsi_disk *sdkp)
1734 unsigned char cmd[10];
1735 unsigned long spintime_expire = 0;
1736 int retries, spintime;
1737 unsigned int the_result;
1738 struct scsi_sense_hdr sshdr;
1739 int sense_valid = 0;
1741 spintime = 0;
1743 /* Spin up drives, as required. Only do this at boot time */
1744 /* Spinup needs to be done for module loads too. */
1745 do {
1746 retries = 0;
1748 do {
1749 cmd[0] = TEST_UNIT_READY;
1750 memset((void *) &cmd[1], 0, 9);
1752 the_result = scsi_execute_req(sdkp->device, cmd,
1753 DMA_NONE, NULL, 0,
1754 &sshdr, SD_TIMEOUT,
1755 SD_MAX_RETRIES, NULL);
1758 * If the drive has indicated to us that it
1759 * doesn't have any media in it, don't bother
1760 * with any more polling.
1762 if (media_not_present(sdkp, &sshdr))
1763 return;
1765 if (the_result)
1766 sense_valid = scsi_sense_valid(&sshdr);
1767 retries++;
1768 } while (retries < 3 &&
1769 (!scsi_status_is_good(the_result) ||
1770 ((driver_byte(the_result) & DRIVER_SENSE) &&
1771 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1773 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1774 /* no sense, TUR either succeeded or failed
1775 * with a status error */
1776 if(!spintime && !scsi_status_is_good(the_result)) {
1777 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1778 sd_print_result(sdkp, the_result);
1780 break;
1784 * The device does not want the automatic start to be issued.
1786 if (sdkp->device->no_start_on_add)
1787 break;
1789 if (sense_valid && sshdr.sense_key == NOT_READY) {
1790 if (sshdr.asc == 4 && sshdr.ascq == 3)
1791 break; /* manual intervention required */
1792 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1793 break; /* standby */
1794 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1795 break; /* unavailable */
1797 * Issue command to spin up drive when not ready
1799 if (!spintime) {
1800 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1801 cmd[0] = START_STOP;
1802 cmd[1] = 1; /* Return immediately */
1803 memset((void *) &cmd[2], 0, 8);
1804 cmd[4] = 1; /* Start spin cycle */
1805 if (sdkp->device->start_stop_pwr_cond)
1806 cmd[4] |= 1 << 4;
1807 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1808 NULL, 0, &sshdr,
1809 SD_TIMEOUT, SD_MAX_RETRIES,
1810 NULL);
1811 spintime_expire = jiffies + 100 * HZ;
1812 spintime = 1;
1814 /* Wait 1 second for next try */
1815 msleep(1000);
1816 printk(".");
1819 * Wait for USB flash devices with slow firmware.
1820 * Yes, this sense key/ASC combination shouldn't
1821 * occur here. It's characteristic of these devices.
1823 } else if (sense_valid &&
1824 sshdr.sense_key == UNIT_ATTENTION &&
1825 sshdr.asc == 0x28) {
1826 if (!spintime) {
1827 spintime_expire = jiffies + 5 * HZ;
1828 spintime = 1;
1830 /* Wait 1 second for next try */
1831 msleep(1000);
1832 } else {
1833 /* we don't understand the sense code, so it's
1834 * probably pointless to loop */
1835 if(!spintime) {
1836 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1837 sd_print_sense_hdr(sdkp, &sshdr);
1839 break;
1842 } while (spintime && time_before_eq(jiffies, spintime_expire));
1844 if (spintime) {
1845 if (scsi_status_is_good(the_result))
1846 printk("ready\n");
1847 else
1848 printk("not responding...\n");
1854 * Determine whether disk supports Data Integrity Field.
1856 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1858 struct scsi_device *sdp = sdkp->device;
1859 u8 type;
1860 int ret = 0;
1862 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1863 return ret;
1865 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1867 if (type > SD_DIF_TYPE3_PROTECTION)
1868 ret = -ENODEV;
1869 else if (scsi_host_dif_capable(sdp->host, type))
1870 ret = 1;
1872 if (sdkp->first_scan || type != sdkp->protection_type)
1873 switch (ret) {
1874 case -ENODEV:
1875 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1876 " protection type %u. Disabling disk!\n",
1877 type);
1878 break;
1879 case 1:
1880 sd_printk(KERN_NOTICE, sdkp,
1881 "Enabling DIF Type %u protection\n", type);
1882 break;
1883 case 0:
1884 sd_printk(KERN_NOTICE, sdkp,
1885 "Disabling DIF Type %u protection\n", type);
1886 break;
1889 sdkp->protection_type = type;
1891 return ret;
1894 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1895 struct scsi_sense_hdr *sshdr, int sense_valid,
1896 int the_result)
1898 sd_print_result(sdkp, the_result);
1899 if (driver_byte(the_result) & DRIVER_SENSE)
1900 sd_print_sense_hdr(sdkp, sshdr);
1901 else
1902 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1905 * Set dirty bit for removable devices if not ready -
1906 * sometimes drives will not report this properly.
1908 if (sdp->removable &&
1909 sense_valid && sshdr->sense_key == NOT_READY)
1910 set_media_not_present(sdkp);
1913 * We used to set media_present to 0 here to indicate no media
1914 * in the drive, but some drives fail read capacity even with
1915 * media present, so we can't do that.
1917 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1920 #define RC16_LEN 32
1921 #if RC16_LEN > SD_BUF_SIZE
1922 #error RC16_LEN must not be more than SD_BUF_SIZE
1923 #endif
1925 #define READ_CAPACITY_RETRIES_ON_RESET 10
1927 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1928 unsigned char *buffer)
1930 unsigned char cmd[16];
1931 struct scsi_sense_hdr sshdr;
1932 int sense_valid = 0;
1933 int the_result;
1934 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1935 unsigned int alignment;
1936 unsigned long long lba;
1937 unsigned sector_size;
1939 if (sdp->no_read_capacity_16)
1940 return -EINVAL;
1942 do {
1943 memset(cmd, 0, 16);
1944 cmd[0] = SERVICE_ACTION_IN;
1945 cmd[1] = SAI_READ_CAPACITY_16;
1946 cmd[13] = RC16_LEN;
1947 memset(buffer, 0, RC16_LEN);
1949 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1950 buffer, RC16_LEN, &sshdr,
1951 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1953 if (media_not_present(sdkp, &sshdr))
1954 return -ENODEV;
1956 if (the_result) {
1957 sense_valid = scsi_sense_valid(&sshdr);
1958 if (sense_valid &&
1959 sshdr.sense_key == ILLEGAL_REQUEST &&
1960 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1961 sshdr.ascq == 0x00)
1962 /* Invalid Command Operation Code or
1963 * Invalid Field in CDB, just retry
1964 * silently with RC10 */
1965 return -EINVAL;
1966 if (sense_valid &&
1967 sshdr.sense_key == UNIT_ATTENTION &&
1968 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1969 /* Device reset might occur several times,
1970 * give it one more chance */
1971 if (--reset_retries > 0)
1972 continue;
1974 retries--;
1976 } while (the_result && retries);
1978 if (the_result) {
1979 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1980 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1981 return -EINVAL;
1984 sector_size = get_unaligned_be32(&buffer[8]);
1985 lba = get_unaligned_be64(&buffer[0]);
1987 if (sd_read_protection_type(sdkp, buffer) < 0) {
1988 sdkp->capacity = 0;
1989 return -ENODEV;
1992 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1993 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1994 "kernel compiled with support for large block "
1995 "devices.\n");
1996 sdkp->capacity = 0;
1997 return -EOVERFLOW;
2000 /* Logical blocks per physical block exponent */
2001 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2003 /* Lowest aligned logical block */
2004 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2005 blk_queue_alignment_offset(sdp->request_queue, alignment);
2006 if (alignment && sdkp->first_scan)
2007 sd_printk(KERN_NOTICE, sdkp,
2008 "physical block alignment offset: %u\n", alignment);
2010 if (buffer[14] & 0x80) { /* LBPME */
2011 sdkp->lbpme = 1;
2013 if (buffer[14] & 0x40) /* LBPRZ */
2014 sdkp->lbprz = 1;
2016 sd_config_discard(sdkp, SD_LBP_WS16);
2019 sdkp->capacity = lba + 1;
2020 return sector_size;
2023 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2024 unsigned char *buffer)
2026 unsigned char cmd[16];
2027 struct scsi_sense_hdr sshdr;
2028 int sense_valid = 0;
2029 int the_result;
2030 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2031 sector_t lba;
2032 unsigned sector_size;
2034 do {
2035 cmd[0] = READ_CAPACITY;
2036 memset(&cmd[1], 0, 9);
2037 memset(buffer, 0, 8);
2039 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2040 buffer, 8, &sshdr,
2041 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2043 if (media_not_present(sdkp, &sshdr))
2044 return -ENODEV;
2046 if (the_result) {
2047 sense_valid = scsi_sense_valid(&sshdr);
2048 if (sense_valid &&
2049 sshdr.sense_key == UNIT_ATTENTION &&
2050 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2051 /* Device reset might occur several times,
2052 * give it one more chance */
2053 if (--reset_retries > 0)
2054 continue;
2056 retries--;
2058 } while (the_result && retries);
2060 if (the_result) {
2061 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2062 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2063 return -EINVAL;
2066 sector_size = get_unaligned_be32(&buffer[4]);
2067 lba = get_unaligned_be32(&buffer[0]);
2069 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2070 /* Some buggy (usb cardreader) devices return an lba of
2071 0xffffffff when the want to report a size of 0 (with
2072 which they really mean no media is present) */
2073 sdkp->capacity = 0;
2074 sdkp->physical_block_size = sector_size;
2075 return sector_size;
2078 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
2079 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2080 "kernel compiled with support for large block "
2081 "devices.\n");
2082 sdkp->capacity = 0;
2083 return -EOVERFLOW;
2086 sdkp->capacity = lba + 1;
2087 sdkp->physical_block_size = sector_size;
2088 return sector_size;
2091 static int sd_try_rc16_first(struct scsi_device *sdp)
2093 if (sdp->host->max_cmd_len < 16)
2094 return 0;
2095 if (sdp->try_rc_10_first)
2096 return 0;
2097 if (sdp->scsi_level > SCSI_SPC_2)
2098 return 1;
2099 if (scsi_device_protection(sdp))
2100 return 1;
2101 return 0;
2105 * read disk capacity
2107 static void
2108 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2110 int sector_size;
2111 struct scsi_device *sdp = sdkp->device;
2112 sector_t old_capacity = sdkp->capacity;
2114 if (sd_try_rc16_first(sdp)) {
2115 sector_size = read_capacity_16(sdkp, sdp, buffer);
2116 if (sector_size == -EOVERFLOW)
2117 goto got_data;
2118 if (sector_size == -ENODEV)
2119 return;
2120 if (sector_size < 0)
2121 sector_size = read_capacity_10(sdkp, sdp, buffer);
2122 if (sector_size < 0)
2123 return;
2124 } else {
2125 sector_size = read_capacity_10(sdkp, sdp, buffer);
2126 if (sector_size == -EOVERFLOW)
2127 goto got_data;
2128 if (sector_size < 0)
2129 return;
2130 if ((sizeof(sdkp->capacity) > 4) &&
2131 (sdkp->capacity > 0xffffffffULL)) {
2132 int old_sector_size = sector_size;
2133 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2134 "Trying to use READ CAPACITY(16).\n");
2135 sector_size = read_capacity_16(sdkp, sdp, buffer);
2136 if (sector_size < 0) {
2137 sd_printk(KERN_NOTICE, sdkp,
2138 "Using 0xffffffff as device size\n");
2139 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2140 sector_size = old_sector_size;
2141 goto got_data;
2146 /* Some devices are known to return the total number of blocks,
2147 * not the highest block number. Some devices have versions
2148 * which do this and others which do not. Some devices we might
2149 * suspect of doing this but we don't know for certain.
2151 * If we know the reported capacity is wrong, decrement it. If
2152 * we can only guess, then assume the number of blocks is even
2153 * (usually true but not always) and err on the side of lowering
2154 * the capacity.
2156 if (sdp->fix_capacity ||
2157 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2158 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2159 "from its reported value: %llu\n",
2160 (unsigned long long) sdkp->capacity);
2161 --sdkp->capacity;
2164 got_data:
2165 if (sector_size == 0) {
2166 sector_size = 512;
2167 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2168 "assuming 512.\n");
2171 if (sector_size != 512 &&
2172 sector_size != 1024 &&
2173 sector_size != 2048 &&
2174 sector_size != 4096) {
2175 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2176 sector_size);
2178 * The user might want to re-format the drive with
2179 * a supported sectorsize. Once this happens, it
2180 * would be relatively trivial to set the thing up.
2181 * For this reason, we leave the thing in the table.
2183 sdkp->capacity = 0;
2185 * set a bogus sector size so the normal read/write
2186 * logic in the block layer will eventually refuse any
2187 * request on this device without tripping over power
2188 * of two sector size assumptions
2190 sector_size = 512;
2192 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2195 char cap_str_2[10], cap_str_10[10];
2196 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2198 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2199 sizeof(cap_str_2));
2200 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2201 sizeof(cap_str_10));
2203 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2204 sd_printk(KERN_NOTICE, sdkp,
2205 "%llu %d-byte logical blocks: (%s/%s)\n",
2206 (unsigned long long)sdkp->capacity,
2207 sector_size, cap_str_10, cap_str_2);
2209 if (sdkp->physical_block_size != sector_size)
2210 sd_printk(KERN_NOTICE, sdkp,
2211 "%u-byte physical blocks\n",
2212 sdkp->physical_block_size);
2216 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2218 /* Rescale capacity to 512-byte units */
2219 if (sector_size == 4096)
2220 sdkp->capacity <<= 3;
2221 else if (sector_size == 2048)
2222 sdkp->capacity <<= 2;
2223 else if (sector_size == 1024)
2224 sdkp->capacity <<= 1;
2226 blk_queue_physical_block_size(sdp->request_queue,
2227 sdkp->physical_block_size);
2228 sdkp->device->sector_size = sector_size;
2231 /* called with buffer of length 512 */
2232 static inline int
2233 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2234 unsigned char *buffer, int len, struct scsi_mode_data *data,
2235 struct scsi_sense_hdr *sshdr)
2237 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2238 SD_TIMEOUT, SD_MAX_RETRIES, data,
2239 sshdr);
2243 * read write protect setting, if possible - called only in sd_revalidate_disk()
2244 * called with buffer of length SD_BUF_SIZE
2246 static void
2247 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2249 int res;
2250 struct scsi_device *sdp = sdkp->device;
2251 struct scsi_mode_data data;
2252 int old_wp = sdkp->write_prot;
2254 set_disk_ro(sdkp->disk, 0);
2255 if (sdp->skip_ms_page_3f) {
2256 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2257 return;
2260 if (sdp->use_192_bytes_for_3f) {
2261 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2262 } else {
2264 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2265 * We have to start carefully: some devices hang if we ask
2266 * for more than is available.
2268 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2271 * Second attempt: ask for page 0 When only page 0 is
2272 * implemented, a request for page 3F may return Sense Key
2273 * 5: Illegal Request, Sense Code 24: Invalid field in
2274 * CDB.
2276 if (!scsi_status_is_good(res))
2277 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2280 * Third attempt: ask 255 bytes, as we did earlier.
2282 if (!scsi_status_is_good(res))
2283 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2284 &data, NULL);
2287 if (!scsi_status_is_good(res)) {
2288 sd_printk(KERN_WARNING, sdkp,
2289 "Test WP failed, assume Write Enabled\n");
2290 } else {
2291 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2292 set_disk_ro(sdkp->disk, sdkp->write_prot);
2293 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2294 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2295 sdkp->write_prot ? "on" : "off");
2296 sd_printk(KERN_DEBUG, sdkp,
2297 "Mode Sense: %02x %02x %02x %02x\n",
2298 buffer[0], buffer[1], buffer[2], buffer[3]);
2304 * sd_read_cache_type - called only from sd_revalidate_disk()
2305 * called with buffer of length SD_BUF_SIZE
2307 static void
2308 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2310 int len = 0, res;
2311 struct scsi_device *sdp = sdkp->device;
2313 int dbd;
2314 int modepage;
2315 int first_len;
2316 struct scsi_mode_data data;
2317 struct scsi_sense_hdr sshdr;
2318 int old_wce = sdkp->WCE;
2319 int old_rcd = sdkp->RCD;
2320 int old_dpofua = sdkp->DPOFUA;
2323 if (sdkp->cache_override)
2324 return;
2326 first_len = 4;
2327 if (sdp->skip_ms_page_8) {
2328 if (sdp->type == TYPE_RBC)
2329 goto defaults;
2330 else {
2331 if (sdp->skip_ms_page_3f)
2332 goto defaults;
2333 modepage = 0x3F;
2334 if (sdp->use_192_bytes_for_3f)
2335 first_len = 192;
2336 dbd = 0;
2338 } else if (sdp->type == TYPE_RBC) {
2339 modepage = 6;
2340 dbd = 8;
2341 } else {
2342 modepage = 8;
2343 dbd = 0;
2346 /* cautiously ask */
2347 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2348 &data, &sshdr);
2350 if (!scsi_status_is_good(res))
2351 goto bad_sense;
2353 if (!data.header_length) {
2354 modepage = 6;
2355 first_len = 0;
2356 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2359 /* that went OK, now ask for the proper length */
2360 len = data.length;
2363 * We're only interested in the first three bytes, actually.
2364 * But the data cache page is defined for the first 20.
2366 if (len < 3)
2367 goto bad_sense;
2368 else if (len > SD_BUF_SIZE) {
2369 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2370 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2371 len = SD_BUF_SIZE;
2373 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2374 len = 192;
2376 /* Get the data */
2377 if (len > first_len)
2378 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2379 &data, &sshdr);
2381 if (scsi_status_is_good(res)) {
2382 int offset = data.header_length + data.block_descriptor_length;
2384 while (offset < len) {
2385 u8 page_code = buffer[offset] & 0x3F;
2386 u8 spf = buffer[offset] & 0x40;
2388 if (page_code == 8 || page_code == 6) {
2389 /* We're interested only in the first 3 bytes.
2391 if (len - offset <= 2) {
2392 sd_printk(KERN_ERR, sdkp, "Incomplete "
2393 "mode parameter data\n");
2394 goto defaults;
2395 } else {
2396 modepage = page_code;
2397 goto Page_found;
2399 } else {
2400 /* Go to the next page */
2401 if (spf && len - offset > 3)
2402 offset += 4 + (buffer[offset+2] << 8) +
2403 buffer[offset+3];
2404 else if (!spf && len - offset > 1)
2405 offset += 2 + buffer[offset+1];
2406 else {
2407 sd_printk(KERN_ERR, sdkp, "Incomplete "
2408 "mode parameter data\n");
2409 goto defaults;
2414 sd_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2415 goto defaults;
2417 Page_found:
2418 if (modepage == 8) {
2419 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2420 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2421 } else {
2422 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2423 sdkp->RCD = 0;
2426 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2427 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2428 sd_printk(KERN_NOTICE, sdkp,
2429 "Uses READ/WRITE(6), disabling FUA\n");
2430 sdkp->DPOFUA = 0;
2433 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2434 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2435 sd_printk(KERN_NOTICE, sdkp,
2436 "Write cache: %s, read cache: %s, %s\n",
2437 sdkp->WCE ? "enabled" : "disabled",
2438 sdkp->RCD ? "disabled" : "enabled",
2439 sdkp->DPOFUA ? "supports DPO and FUA"
2440 : "doesn't support DPO or FUA");
2442 return;
2445 bad_sense:
2446 if (scsi_sense_valid(&sshdr) &&
2447 sshdr.sense_key == ILLEGAL_REQUEST &&
2448 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2449 /* Invalid field in CDB */
2450 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2451 else
2452 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2454 defaults:
2455 if (sdp->wce_default_on) {
2456 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2457 sdkp->WCE = 1;
2458 } else {
2459 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2460 sdkp->WCE = 0;
2462 sdkp->RCD = 0;
2463 sdkp->DPOFUA = 0;
2467 * The ATO bit indicates whether the DIF application tag is available
2468 * for use by the operating system.
2470 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2472 int res, offset;
2473 struct scsi_device *sdp = sdkp->device;
2474 struct scsi_mode_data data;
2475 struct scsi_sense_hdr sshdr;
2477 if (sdp->type != TYPE_DISK)
2478 return;
2480 if (sdkp->protection_type == 0)
2481 return;
2483 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2484 SD_MAX_RETRIES, &data, &sshdr);
2486 if (!scsi_status_is_good(res) || !data.header_length ||
2487 data.length < 6) {
2488 sd_printk(KERN_WARNING, sdkp,
2489 "getting Control mode page failed, assume no ATO\n");
2491 if (scsi_sense_valid(&sshdr))
2492 sd_print_sense_hdr(sdkp, &sshdr);
2494 return;
2497 offset = data.header_length + data.block_descriptor_length;
2499 if ((buffer[offset] & 0x3f) != 0x0a) {
2500 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2501 return;
2504 if ((buffer[offset + 5] & 0x80) == 0)
2505 return;
2507 sdkp->ATO = 1;
2509 return;
2513 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2514 * @disk: disk to query
2516 static void sd_read_block_limits(struct scsi_disk *sdkp)
2518 unsigned int sector_sz = sdkp->device->sector_size;
2519 const int vpd_len = 64;
2520 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2522 if (!buffer ||
2523 /* Block Limits VPD */
2524 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2525 goto out;
2527 blk_queue_io_min(sdkp->disk->queue,
2528 get_unaligned_be16(&buffer[6]) * sector_sz);
2529 blk_queue_io_opt(sdkp->disk->queue,
2530 get_unaligned_be32(&buffer[12]) * sector_sz);
2532 if (buffer[3] == 0x3c) {
2533 unsigned int lba_count, desc_count;
2535 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2537 if (!sdkp->lbpme)
2538 goto out;
2540 lba_count = get_unaligned_be32(&buffer[20]);
2541 desc_count = get_unaligned_be32(&buffer[24]);
2543 if (lba_count && desc_count)
2544 sdkp->max_unmap_blocks = lba_count;
2546 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2548 if (buffer[32] & 0x80)
2549 sdkp->unmap_alignment =
2550 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2552 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2554 if (sdkp->max_unmap_blocks)
2555 sd_config_discard(sdkp, SD_LBP_UNMAP);
2556 else
2557 sd_config_discard(sdkp, SD_LBP_WS16);
2559 } else { /* LBP VPD page tells us what to use */
2561 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2562 sd_config_discard(sdkp, SD_LBP_UNMAP);
2563 else if (sdkp->lbpws)
2564 sd_config_discard(sdkp, SD_LBP_WS16);
2565 else if (sdkp->lbpws10)
2566 sd_config_discard(sdkp, SD_LBP_WS10);
2567 else
2568 sd_config_discard(sdkp, SD_LBP_DISABLE);
2572 out:
2573 kfree(buffer);
2577 * sd_read_block_characteristics - Query block dev. characteristics
2578 * @disk: disk to query
2580 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2582 unsigned char *buffer;
2583 u16 rot;
2584 const int vpd_len = 64;
2586 buffer = kmalloc(vpd_len, GFP_KERNEL);
2588 if (!buffer ||
2589 /* Block Device Characteristics VPD */
2590 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2591 goto out;
2593 rot = get_unaligned_be16(&buffer[4]);
2595 if (rot == 1)
2596 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2598 out:
2599 kfree(buffer);
2603 * sd_read_block_provisioning - Query provisioning VPD page
2604 * @disk: disk to query
2606 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2608 unsigned char *buffer;
2609 const int vpd_len = 8;
2611 if (sdkp->lbpme == 0)
2612 return;
2614 buffer = kmalloc(vpd_len, GFP_KERNEL);
2616 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2617 goto out;
2619 sdkp->lbpvpd = 1;
2620 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2621 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2622 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2624 out:
2625 kfree(buffer);
2628 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2630 struct scsi_device *sdev = sdkp->device;
2632 if (sdev->host->no_write_same) {
2633 sdev->no_write_same = 1;
2635 return;
2638 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2639 /* too large values might cause issues with arcmsr */
2640 int vpd_buf_len = 64;
2642 sdev->no_report_opcodes = 1;
2644 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2645 * CODES is unsupported and the device has an ATA
2646 * Information VPD page (SAT).
2648 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2649 sdev->no_write_same = 1;
2652 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2653 sdkp->ws16 = 1;
2655 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2656 sdkp->ws10 = 1;
2659 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2661 /* Attempt VPD inquiry if the device blacklist explicitly calls
2662 * for it.
2664 if (sdp->try_vpd_pages)
2665 return 1;
2667 * Although VPD inquiries can go to SCSI-2 type devices,
2668 * some USB ones crash on receiving them, and the pages
2669 * we currently ask for are for SPC-3 and beyond
2671 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2672 return 1;
2673 return 0;
2677 * sd_revalidate_disk - called the first time a new disk is seen,
2678 * performs disk spin up, read_capacity, etc.
2679 * @disk: struct gendisk we care about
2681 static int sd_revalidate_disk(struct gendisk *disk)
2683 struct scsi_disk *sdkp = scsi_disk(disk);
2684 struct scsi_device *sdp = sdkp->device;
2685 unsigned char *buffer;
2686 unsigned flush = 0;
2688 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2689 "sd_revalidate_disk\n"));
2692 * If the device is offline, don't try and read capacity or any
2693 * of the other niceties.
2695 if (!scsi_device_online(sdp))
2696 goto out;
2698 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2699 if (!buffer) {
2700 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2701 "allocation failure.\n");
2702 goto out;
2705 sd_spinup_disk(sdkp);
2708 * Without media there is no reason to ask; moreover, some devices
2709 * react badly if we do.
2711 if (sdkp->media_present) {
2712 sd_read_capacity(sdkp, buffer);
2714 if (sd_try_extended_inquiry(sdp)) {
2715 sd_read_block_provisioning(sdkp);
2716 sd_read_block_limits(sdkp);
2717 sd_read_block_characteristics(sdkp);
2720 sd_read_write_protect_flag(sdkp, buffer);
2721 sd_read_cache_type(sdkp, buffer);
2722 sd_read_app_tag_own(sdkp, buffer);
2723 sd_read_write_same(sdkp, buffer);
2726 sdkp->first_scan = 0;
2729 * We now have all cache related info, determine how we deal
2730 * with flush requests.
2732 if (sdkp->WCE) {
2733 flush |= REQ_FLUSH;
2734 if (sdkp->DPOFUA)
2735 flush |= REQ_FUA;
2738 blk_queue_flush(sdkp->disk->queue, flush);
2740 set_capacity(disk, sdkp->capacity);
2741 sd_config_write_same(sdkp);
2742 kfree(buffer);
2744 out:
2745 return 0;
2749 * sd_unlock_native_capacity - unlock native capacity
2750 * @disk: struct gendisk to set capacity for
2752 * Block layer calls this function if it detects that partitions
2753 * on @disk reach beyond the end of the device. If the SCSI host
2754 * implements ->unlock_native_capacity() method, it's invoked to
2755 * give it a chance to adjust the device capacity.
2757 * CONTEXT:
2758 * Defined by block layer. Might sleep.
2760 static void sd_unlock_native_capacity(struct gendisk *disk)
2762 struct scsi_device *sdev = scsi_disk(disk)->device;
2764 if (sdev->host->hostt->unlock_native_capacity)
2765 sdev->host->hostt->unlock_native_capacity(sdev);
2769 * sd_format_disk_name - format disk name
2770 * @prefix: name prefix - ie. "sd" for SCSI disks
2771 * @index: index of the disk to format name for
2772 * @buf: output buffer
2773 * @buflen: length of the output buffer
2775 * SCSI disk names starts at sda. The 26th device is sdz and the
2776 * 27th is sdaa. The last one for two lettered suffix is sdzz
2777 * which is followed by sdaaa.
2779 * This is basically 26 base counting with one extra 'nil' entry
2780 * at the beginning from the second digit on and can be
2781 * determined using similar method as 26 base conversion with the
2782 * index shifted -1 after each digit is computed.
2784 * CONTEXT:
2785 * Don't care.
2787 * RETURNS:
2788 * 0 on success, -errno on failure.
2790 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2792 const int base = 'z' - 'a' + 1;
2793 char *begin = buf + strlen(prefix);
2794 char *end = buf + buflen;
2795 char *p;
2796 int unit;
2798 p = end - 1;
2799 *p = '\0';
2800 unit = base;
2801 do {
2802 if (p == begin)
2803 return -EINVAL;
2804 *--p = 'a' + (index % unit);
2805 index = (index / unit) - 1;
2806 } while (index >= 0);
2808 memmove(begin, p, end - p);
2809 memcpy(buf, prefix, strlen(prefix));
2811 return 0;
2815 * The asynchronous part of sd_probe
2817 static void sd_probe_async(void *data, async_cookie_t cookie)
2819 struct scsi_disk *sdkp = data;
2820 struct scsi_device *sdp;
2821 struct gendisk *gd;
2822 u32 index;
2823 struct device *dev;
2825 sdp = sdkp->device;
2826 gd = sdkp->disk;
2827 index = sdkp->index;
2828 dev = &sdp->sdev_gendev;
2830 gd->major = sd_major((index & 0xf0) >> 4);
2831 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2832 gd->minors = SD_MINORS;
2834 gd->fops = &sd_fops;
2835 gd->private_data = &sdkp->driver;
2836 gd->queue = sdkp->device->request_queue;
2838 /* defaults, until the device tells us otherwise */
2839 sdp->sector_size = 512;
2840 sdkp->capacity = 0;
2841 sdkp->media_present = 1;
2842 sdkp->write_prot = 0;
2843 sdkp->cache_override = 0;
2844 sdkp->WCE = 0;
2845 sdkp->RCD = 0;
2846 sdkp->ATO = 0;
2847 sdkp->first_scan = 1;
2848 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2850 sd_revalidate_disk(gd);
2852 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2853 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2855 gd->driverfs_dev = &sdp->sdev_gendev;
2856 gd->flags = GENHD_FL_EXT_DEVT;
2857 if (sdp->removable) {
2858 gd->flags |= GENHD_FL_REMOVABLE;
2859 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2862 blk_pm_runtime_init(sdp->request_queue, dev);
2863 add_disk(gd);
2864 if (sdkp->capacity)
2865 sd_dif_config_host(sdkp);
2867 sd_revalidate_disk(gd);
2869 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2870 sdp->removable ? "removable " : "");
2871 scsi_autopm_put_device(sdp);
2872 put_device(&sdkp->dev);
2876 * sd_probe - called during driver initialization and whenever a
2877 * new scsi device is attached to the system. It is called once
2878 * for each scsi device (not just disks) present.
2879 * @dev: pointer to device object
2881 * Returns 0 if successful (or not interested in this scsi device
2882 * (e.g. scanner)); 1 when there is an error.
2884 * Note: this function is invoked from the scsi mid-level.
2885 * This function sets up the mapping between a given
2886 * <host,channel,id,lun> (found in sdp) and new device name
2887 * (e.g. /dev/sda). More precisely it is the block device major
2888 * and minor number that is chosen here.
2890 * Assume sd_probe is not re-entrant (for time being)
2891 * Also think about sd_probe() and sd_remove() running coincidentally.
2893 static int sd_probe(struct device *dev)
2895 struct scsi_device *sdp = to_scsi_device(dev);
2896 struct scsi_disk *sdkp;
2897 struct gendisk *gd;
2898 int index;
2899 int error;
2901 error = -ENODEV;
2902 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2903 goto out;
2905 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2906 "sd_probe\n"));
2908 error = -ENOMEM;
2909 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2910 if (!sdkp)
2911 goto out;
2913 gd = alloc_disk(SD_MINORS);
2914 if (!gd)
2915 goto out_free;
2917 do {
2918 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2919 goto out_put;
2921 spin_lock(&sd_index_lock);
2922 error = ida_get_new(&sd_index_ida, &index);
2923 spin_unlock(&sd_index_lock);
2924 } while (error == -EAGAIN);
2926 if (error) {
2927 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2928 goto out_put;
2931 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2932 if (error) {
2933 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2934 goto out_free_index;
2937 sdkp->device = sdp;
2938 sdkp->driver = &sd_template;
2939 sdkp->disk = gd;
2940 sdkp->index = index;
2941 atomic_set(&sdkp->openers, 0);
2942 atomic_set(&sdkp->device->ioerr_cnt, 0);
2944 if (!sdp->request_queue->rq_timeout) {
2945 if (sdp->type != TYPE_MOD)
2946 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2947 else
2948 blk_queue_rq_timeout(sdp->request_queue,
2949 SD_MOD_TIMEOUT);
2952 device_initialize(&sdkp->dev);
2953 sdkp->dev.parent = dev;
2954 sdkp->dev.class = &sd_disk_class;
2955 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
2957 if (device_add(&sdkp->dev))
2958 goto out_free_index;
2960 get_device(dev);
2961 dev_set_drvdata(dev, sdkp);
2963 get_device(&sdkp->dev); /* prevent release before async_schedule */
2964 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
2966 return 0;
2968 out_free_index:
2969 spin_lock(&sd_index_lock);
2970 ida_remove(&sd_index_ida, index);
2971 spin_unlock(&sd_index_lock);
2972 out_put:
2973 put_disk(gd);
2974 out_free:
2975 kfree(sdkp);
2976 out:
2977 return error;
2981 * sd_remove - called whenever a scsi disk (previously recognized by
2982 * sd_probe) is detached from the system. It is called (potentially
2983 * multiple times) during sd module unload.
2984 * @sdp: pointer to mid level scsi device object
2986 * Note: this function is invoked from the scsi mid-level.
2987 * This function potentially frees up a device name (e.g. /dev/sdc)
2988 * that could be re-used by a subsequent sd_probe().
2989 * This function is not called when the built-in sd driver is "exit-ed".
2991 static int sd_remove(struct device *dev)
2993 struct scsi_disk *sdkp;
2994 dev_t devt;
2996 sdkp = dev_get_drvdata(dev);
2997 devt = disk_devt(sdkp->disk);
2998 scsi_autopm_get_device(sdkp->device);
3000 async_synchronize_full_domain(&scsi_sd_probe_domain);
3001 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
3002 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
3003 device_del(&sdkp->dev);
3004 del_gendisk(sdkp->disk);
3005 sd_shutdown(dev);
3007 blk_register_region(devt, SD_MINORS, NULL,
3008 sd_default_probe, NULL, NULL);
3010 mutex_lock(&sd_ref_mutex);
3011 dev_set_drvdata(dev, NULL);
3012 put_device(&sdkp->dev);
3013 mutex_unlock(&sd_ref_mutex);
3015 return 0;
3019 * scsi_disk_release - Called to free the scsi_disk structure
3020 * @dev: pointer to embedded class device
3022 * sd_ref_mutex must be held entering this routine. Because it is
3023 * called on last put, you should always use the scsi_disk_get()
3024 * scsi_disk_put() helpers which manipulate the semaphore directly
3025 * and never do a direct put_device.
3027 static void scsi_disk_release(struct device *dev)
3029 struct scsi_disk *sdkp = to_scsi_disk(dev);
3030 struct gendisk *disk = sdkp->disk;
3032 spin_lock(&sd_index_lock);
3033 ida_remove(&sd_index_ida, sdkp->index);
3034 spin_unlock(&sd_index_lock);
3036 disk->private_data = NULL;
3037 put_disk(disk);
3038 put_device(&sdkp->device->sdev_gendev);
3040 kfree(sdkp);
3043 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3045 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3046 struct scsi_sense_hdr sshdr;
3047 struct scsi_device *sdp = sdkp->device;
3048 int res;
3050 if (start)
3051 cmd[4] |= 1; /* START */
3053 if (sdp->start_stop_pwr_cond)
3054 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3056 if (!scsi_device_online(sdp))
3057 return -ENODEV;
3059 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3060 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3061 if (res) {
3062 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3063 sd_print_result(sdkp, res);
3064 if (driver_byte(res) & DRIVER_SENSE)
3065 sd_print_sense_hdr(sdkp, &sshdr);
3068 return res;
3072 * Send a SYNCHRONIZE CACHE instruction down to the device through
3073 * the normal SCSI command structure. Wait for the command to
3074 * complete.
3076 static void sd_shutdown(struct device *dev)
3078 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3080 if (!sdkp)
3081 return; /* this can happen */
3083 if (pm_runtime_suspended(dev))
3084 goto exit;
3086 if (sdkp->WCE) {
3087 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3088 sd_sync_cache(sdkp);
3091 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3092 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3093 sd_start_stop_device(sdkp, 0);
3096 exit:
3097 scsi_disk_put(sdkp);
3100 static int sd_suspend(struct device *dev)
3102 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3103 int ret = 0;
3105 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3106 return 0;
3108 if (sdkp->WCE) {
3109 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3110 ret = sd_sync_cache(sdkp);
3111 if (ret)
3112 goto done;
3115 if (sdkp->device->manage_start_stop) {
3116 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3117 ret = sd_start_stop_device(sdkp, 0);
3120 done:
3121 scsi_disk_put(sdkp);
3122 return ret;
3125 static int sd_resume(struct device *dev)
3127 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3128 int ret = 0;
3130 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3131 return 0;
3133 if (!sdkp->device->manage_start_stop)
3134 goto done;
3136 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3137 ret = sd_start_stop_device(sdkp, 1);
3139 done:
3140 scsi_disk_put(sdkp);
3141 return ret;
3145 * init_sd - entry point for this driver (both when built in or when
3146 * a module).
3148 * Note: this function registers this driver with the scsi mid-level.
3150 static int __init init_sd(void)
3152 int majors = 0, i, err;
3154 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3156 for (i = 0; i < SD_MAJORS; i++) {
3157 if (register_blkdev(sd_major(i), "sd") != 0)
3158 continue;
3159 majors++;
3160 blk_register_region(sd_major(i), SD_MINORS, NULL,
3161 sd_default_probe, NULL, NULL);
3164 if (!majors)
3165 return -ENODEV;
3167 err = class_register(&sd_disk_class);
3168 if (err)
3169 goto err_out;
3171 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3172 0, 0, NULL);
3173 if (!sd_cdb_cache) {
3174 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3175 goto err_out_class;
3178 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3179 if (!sd_cdb_pool) {
3180 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3181 goto err_out_cache;
3184 err = scsi_register_driver(&sd_template.gendrv);
3185 if (err)
3186 goto err_out_driver;
3188 return 0;
3190 err_out_driver:
3191 mempool_destroy(sd_cdb_pool);
3193 err_out_cache:
3194 kmem_cache_destroy(sd_cdb_cache);
3196 err_out_class:
3197 class_unregister(&sd_disk_class);
3198 err_out:
3199 for (i = 0; i < SD_MAJORS; i++)
3200 unregister_blkdev(sd_major(i), "sd");
3201 return err;
3205 * exit_sd - exit point for this driver (when it is a module).
3207 * Note: this function unregisters this driver from the scsi mid-level.
3209 static void __exit exit_sd(void)
3211 int i;
3213 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3215 scsi_unregister_driver(&sd_template.gendrv);
3216 mempool_destroy(sd_cdb_pool);
3217 kmem_cache_destroy(sd_cdb_cache);
3219 class_unregister(&sd_disk_class);
3221 for (i = 0; i < SD_MAJORS; i++) {
3222 blk_unregister_region(sd_major(i), SD_MINORS);
3223 unregister_blkdev(sd_major(i), "sd");
3227 module_init(init_sd);
3228 module_exit(exit_sd);
3230 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3231 struct scsi_sense_hdr *sshdr)
3233 sd_printk(KERN_INFO, sdkp, " ");
3234 scsi_show_sense_hdr(sshdr);
3235 sd_printk(KERN_INFO, sdkp, " ");
3236 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3239 static void sd_print_result(struct scsi_disk *sdkp, int result)
3241 sd_printk(KERN_INFO, sdkp, " ");
3242 scsi_show_result(result);