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1/*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
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.
25 *
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.
33 */
34
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 <asm/uaccess.h>
54#include <asm/unaligned.h>
55
56#include <scsi/scsi.h>
57#include <scsi/scsi_cmnd.h>
58#include <scsi/scsi_dbg.h>
59#include <scsi/scsi_device.h>
60#include <scsi/scsi_driver.h>
61#include <scsi/scsi_eh.h>
62#include <scsi/scsi_host.h>
63#include <scsi/scsi_ioctl.h>
64#include <scsi/scsicam.h>
65
66#include "sd.h"
67#include "scsi_logging.h"
68
69MODULE_AUTHOR("Eric Youngdale");
70MODULE_DESCRIPTION("SCSI disk (sd) driver");
71MODULE_LICENSE("GPL");
72
73MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
74MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
75MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
76MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
77MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
89MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
90MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
91MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
92
93#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
94#define SD_MINORS 16
95#else
96#define SD_MINORS 0
97#endif
98
99static void sd_config_discard(struct scsi_disk *, unsigned int);
100static int sd_revalidate_disk(struct gendisk *);
101static void sd_unlock_native_capacity(struct gendisk *disk);
102static int sd_probe(struct device *);
103static int sd_remove(struct device *);
104static void sd_shutdown(struct device *);
105static int sd_suspend(struct device *, pm_message_t state);
106static int sd_resume(struct device *);
107static void sd_rescan(struct device *);
108static int sd_done(struct scsi_cmnd *);
109static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
110static void scsi_disk_release(struct device *cdev);
111static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
112static void sd_print_result(struct scsi_disk *, int);
113
114static DEFINE_SPINLOCK(sd_index_lock);
115static DEFINE_IDA(sd_index_ida);
116
117/* This semaphore is used to mediate the 0->1 reference get in the
118 * face of object destruction (i.e. we can't allow a get on an
119 * object after last put) */
120static DEFINE_MUTEX(sd_ref_mutex);
121
122static struct kmem_cache *sd_cdb_cache;
123static mempool_t *sd_cdb_pool;
124
125static const char *sd_cache_types[] = {
126 "write through", "none", "write back",
127 "write back, no read (daft)"
128};
129
130static ssize_t
131sd_store_cache_type(struct device *dev, struct device_attribute *attr,
132 const char *buf, size_t count)
133{
134 int i, ct = -1, rcd, wce, sp;
135 struct scsi_disk *sdkp = to_scsi_disk(dev);
136 struct scsi_device *sdp = sdkp->device;
137 char buffer[64];
138 char *buffer_data;
139 struct scsi_mode_data data;
140 struct scsi_sense_hdr sshdr;
141 int len;
142
143 if (sdp->type != TYPE_DISK)
144 /* no cache control on RBC devices; theoretically they
145 * can do it, but there's probably so many exceptions
146 * it's not worth the risk */
147 return -EINVAL;
148
149 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
150 len = strlen(sd_cache_types[i]);
151 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
152 buf[len] == '\n') {
153 ct = i;
154 break;
155 }
156 }
157 if (ct < 0)
158 return -EINVAL;
159 rcd = ct & 0x01 ? 1 : 0;
160 wce = ct & 0x02 ? 1 : 0;
161 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
162 SD_MAX_RETRIES, &data, NULL))
163 return -EINVAL;
164 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
165 data.block_descriptor_length);
166 buffer_data = buffer + data.header_length +
167 data.block_descriptor_length;
168 buffer_data[2] &= ~0x05;
169 buffer_data[2] |= wce << 2 | rcd;
170 sp = buffer_data[0] & 0x80 ? 1 : 0;
171
172 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
173 SD_MAX_RETRIES, &data, &sshdr)) {
174 if (scsi_sense_valid(&sshdr))
175 sd_print_sense_hdr(sdkp, &sshdr);
176 return -EINVAL;
177 }
178 revalidate_disk(sdkp->disk);
179 return count;
180}
181
182static ssize_t
183sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
184 const char *buf, size_t count)
185{
186 struct scsi_disk *sdkp = to_scsi_disk(dev);
187 struct scsi_device *sdp = sdkp->device;
188
189 if (!capable(CAP_SYS_ADMIN))
190 return -EACCES;
191
192 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
193
194 return count;
195}
196
197static ssize_t
198sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
199 const char *buf, size_t count)
200{
201 struct scsi_disk *sdkp = to_scsi_disk(dev);
202 struct scsi_device *sdp = sdkp->device;
203
204 if (!capable(CAP_SYS_ADMIN))
205 return -EACCES;
206
207 if (sdp->type != TYPE_DISK)
208 return -EINVAL;
209
210 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
211
212 return count;
213}
214
215static ssize_t
216sd_show_cache_type(struct device *dev, struct device_attribute *attr,
217 char *buf)
218{
219 struct scsi_disk *sdkp = to_scsi_disk(dev);
220 int ct = sdkp->RCD + 2*sdkp->WCE;
221
222 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
223}
224
225static ssize_t
226sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
227{
228 struct scsi_disk *sdkp = to_scsi_disk(dev);
229
230 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
231}
232
233static ssize_t
234sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
235 char *buf)
236{
237 struct scsi_disk *sdkp = to_scsi_disk(dev);
238 struct scsi_device *sdp = sdkp->device;
239
240 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
241}
242
243static ssize_t
244sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
245 char *buf)
246{
247 struct scsi_disk *sdkp = to_scsi_disk(dev);
248
249 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
250}
251
252static ssize_t
253sd_show_protection_type(struct device *dev, struct device_attribute *attr,
254 char *buf)
255{
256 struct scsi_disk *sdkp = to_scsi_disk(dev);
257
258 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
259}
260
261static ssize_t
262sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
263 char *buf)
264{
265 struct scsi_disk *sdkp = to_scsi_disk(dev);
266 struct scsi_device *sdp = sdkp->device;
267 unsigned int dif, dix;
268
269 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
270 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
271
272 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
273 dif = 0;
274 dix = 1;
275 }
276
277 if (!dif && !dix)
278 return snprintf(buf, 20, "none\n");
279
280 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
281}
282
283static ssize_t
284sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
285 char *buf)
286{
287 struct scsi_disk *sdkp = to_scsi_disk(dev);
288
289 return snprintf(buf, 20, "%u\n", sdkp->ATO);
290}
291
292static ssize_t
293sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
294 char *buf)
295{
296 struct scsi_disk *sdkp = to_scsi_disk(dev);
297
298 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
299}
300
301static const char *lbp_mode[] = {
302 [SD_LBP_FULL] = "full",
303 [SD_LBP_UNMAP] = "unmap",
304 [SD_LBP_WS16] = "writesame_16",
305 [SD_LBP_WS10] = "writesame_10",
306 [SD_LBP_ZERO] = "writesame_zero",
307 [SD_LBP_DISABLE] = "disabled",
308};
309
310static ssize_t
311sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
312 char *buf)
313{
314 struct scsi_disk *sdkp = to_scsi_disk(dev);
315
316 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
317}
318
319static ssize_t
320sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
321 const char *buf, size_t count)
322{
323 struct scsi_disk *sdkp = to_scsi_disk(dev);
324 struct scsi_device *sdp = sdkp->device;
325
326 if (!capable(CAP_SYS_ADMIN))
327 return -EACCES;
328
329 if (sdp->type != TYPE_DISK)
330 return -EINVAL;
331
332 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
333 sd_config_discard(sdkp, SD_LBP_UNMAP);
334 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
335 sd_config_discard(sdkp, SD_LBP_WS16);
336 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
337 sd_config_discard(sdkp, SD_LBP_WS10);
338 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
339 sd_config_discard(sdkp, SD_LBP_ZERO);
340 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
341 sd_config_discard(sdkp, SD_LBP_DISABLE);
342 else
343 return -EINVAL;
344
345 return count;
346}
347
348static struct device_attribute sd_disk_attrs[] = {
349 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
350 sd_store_cache_type),
351 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
352 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
353 sd_store_allow_restart),
354 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
355 sd_store_manage_start_stop),
356 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
357 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
358 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
359 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
360 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
361 sd_store_provisioning_mode),
362 __ATTR_NULL,
363};
364
365static struct class sd_disk_class = {
366 .name = "scsi_disk",
367 .owner = THIS_MODULE,
368 .dev_release = scsi_disk_release,
369 .dev_attrs = sd_disk_attrs,
370};
371
372static struct scsi_driver sd_template = {
373 .owner = THIS_MODULE,
374 .gendrv = {
375 .name = "sd",
376 .probe = sd_probe,
377 .remove = sd_remove,
378 .suspend = sd_suspend,
379 .resume = sd_resume,
380 .shutdown = sd_shutdown,
381 },
382 .rescan = sd_rescan,
383 .done = sd_done,
384};
385
386/*
387 * Device no to disk mapping:
388 *
389 * major disc2 disc p1
390 * |............|.............|....|....| <- dev_t
391 * 31 20 19 8 7 4 3 0
392 *
393 * Inside a major, we have 16k disks, however mapped non-
394 * contiguously. The first 16 disks are for major0, the next
395 * ones with major1, ... Disk 256 is for major0 again, disk 272
396 * for major1, ...
397 * As we stay compatible with our numbering scheme, we can reuse
398 * the well-know SCSI majors 8, 65--71, 136--143.
399 */
400static int sd_major(int major_idx)
401{
402 switch (major_idx) {
403 case 0:
404 return SCSI_DISK0_MAJOR;
405 case 1 ... 7:
406 return SCSI_DISK1_MAJOR + major_idx - 1;
407 case 8 ... 15:
408 return SCSI_DISK8_MAJOR + major_idx - 8;
409 default:
410 BUG();
411 return 0; /* shut up gcc */
412 }
413}
414
415static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
416{
417 struct scsi_disk *sdkp = NULL;
418
419 if (disk->private_data) {
420 sdkp = scsi_disk(disk);
421 if (scsi_device_get(sdkp->device) == 0)
422 get_device(&sdkp->dev);
423 else
424 sdkp = NULL;
425 }
426 return sdkp;
427}
428
429static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
430{
431 struct scsi_disk *sdkp;
432
433 mutex_lock(&sd_ref_mutex);
434 sdkp = __scsi_disk_get(disk);
435 mutex_unlock(&sd_ref_mutex);
436 return sdkp;
437}
438
439static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
440{
441 struct scsi_disk *sdkp;
442
443 mutex_lock(&sd_ref_mutex);
444 sdkp = dev_get_drvdata(dev);
445 if (sdkp)
446 sdkp = __scsi_disk_get(sdkp->disk);
447 mutex_unlock(&sd_ref_mutex);
448 return sdkp;
449}
450
451static void scsi_disk_put(struct scsi_disk *sdkp)
452{
453 struct scsi_device *sdev = sdkp->device;
454
455 mutex_lock(&sd_ref_mutex);
456 put_device(&sdkp->dev);
457 scsi_device_put(sdev);
458 mutex_unlock(&sd_ref_mutex);
459}
460
461static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
462{
463 unsigned int prot_op = SCSI_PROT_NORMAL;
464 unsigned int dix = scsi_prot_sg_count(scmd);
465
466 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
467 if (dif && dix)
468 prot_op = SCSI_PROT_READ_PASS;
469 else if (dif && !dix)
470 prot_op = SCSI_PROT_READ_STRIP;
471 else if (!dif && dix)
472 prot_op = SCSI_PROT_READ_INSERT;
473 } else {
474 if (dif && dix)
475 prot_op = SCSI_PROT_WRITE_PASS;
476 else if (dif && !dix)
477 prot_op = SCSI_PROT_WRITE_INSERT;
478 else if (!dif && dix)
479 prot_op = SCSI_PROT_WRITE_STRIP;
480 }
481
482 scsi_set_prot_op(scmd, prot_op);
483 scsi_set_prot_type(scmd, dif);
484}
485
486static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
487{
488 struct request_queue *q = sdkp->disk->queue;
489 unsigned int logical_block_size = sdkp->device->sector_size;
490 unsigned int max_blocks = 0;
491
492 q->limits.discard_zeroes_data = sdkp->lbprz;
493 q->limits.discard_alignment = sdkp->unmap_alignment *
494 logical_block_size;
495 q->limits.discard_granularity =
496 max(sdkp->physical_block_size,
497 sdkp->unmap_granularity * logical_block_size);
498
499 switch (mode) {
500
501 case SD_LBP_DISABLE:
502 q->limits.max_discard_sectors = 0;
503 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
504 return;
505
506 case SD_LBP_UNMAP:
507 max_blocks = min_not_zero(sdkp->max_unmap_blocks, 0xffffffff);
508 break;
509
510 case SD_LBP_WS16:
511 max_blocks = min_not_zero(sdkp->max_ws_blocks, 0xffffffff);
512 break;
513
514 case SD_LBP_WS10:
515 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
516 break;
517
518 case SD_LBP_ZERO:
519 max_blocks = min_not_zero(sdkp->max_ws_blocks, (u32)0xffff);
520 q->limits.discard_zeroes_data = 1;
521 break;
522 }
523
524 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
525 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
526
527 sdkp->provisioning_mode = mode;
528}
529
530/**
531 * scsi_setup_discard_cmnd - unmap blocks on thinly provisioned device
532 * @sdp: scsi device to operate one
533 * @rq: Request to prepare
534 *
535 * Will issue either UNMAP or WRITE SAME(16) depending on preference
536 * indicated by target device.
537 **/
538static int scsi_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
539{
540 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
541 struct bio *bio = rq->bio;
542 sector_t sector = bio->bi_sector;
543 unsigned int nr_sectors = bio_sectors(bio);
544 unsigned int len;
545 int ret;
546 char *buf;
547 struct page *page;
548
549 if (sdkp->device->sector_size == 4096) {
550 sector >>= 3;
551 nr_sectors >>= 3;
552 }
553
554 rq->timeout = SD_TIMEOUT;
555
556 memset(rq->cmd, 0, rq->cmd_len);
557
558 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
559 if (!page)
560 return BLKPREP_DEFER;
561
562 switch (sdkp->provisioning_mode) {
563 case SD_LBP_UNMAP:
564 buf = page_address(page);
565
566 rq->cmd_len = 10;
567 rq->cmd[0] = UNMAP;
568 rq->cmd[8] = 24;
569
570 put_unaligned_be16(6 + 16, &buf[0]);
571 put_unaligned_be16(16, &buf[2]);
572 put_unaligned_be64(sector, &buf[8]);
573 put_unaligned_be32(nr_sectors, &buf[16]);
574
575 len = 24;
576 break;
577
578 case SD_LBP_WS16:
579 rq->cmd_len = 16;
580 rq->cmd[0] = WRITE_SAME_16;
581 rq->cmd[1] = 0x8; /* UNMAP */
582 put_unaligned_be64(sector, &rq->cmd[2]);
583 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
584
585 len = sdkp->device->sector_size;
586 break;
587
588 case SD_LBP_WS10:
589 case SD_LBP_ZERO:
590 rq->cmd_len = 10;
591 rq->cmd[0] = WRITE_SAME;
592 if (sdkp->provisioning_mode == SD_LBP_WS10)
593 rq->cmd[1] = 0x8; /* UNMAP */
594 put_unaligned_be32(sector, &rq->cmd[2]);
595 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
596
597 len = sdkp->device->sector_size;
598 break;
599
600 default:
601 ret = BLKPREP_KILL;
602 goto out;
603 }
604
605 blk_add_request_payload(rq, page, len);
606 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
607 rq->buffer = page_address(page);
608
609out:
610 if (ret != BLKPREP_OK) {
611 __free_page(page);
612 rq->buffer = NULL;
613 }
614 return ret;
615}
616
617static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
618{
619 rq->timeout = SD_FLUSH_TIMEOUT;
620 rq->retries = SD_MAX_RETRIES;
621 rq->cmd[0] = SYNCHRONIZE_CACHE;
622 rq->cmd_len = 10;
623
624 return scsi_setup_blk_pc_cmnd(sdp, rq);
625}
626
627static void sd_unprep_fn(struct request_queue *q, struct request *rq)
628{
629 if (rq->cmd_flags & REQ_DISCARD) {
630 free_page((unsigned long)rq->buffer);
631 rq->buffer = NULL;
632 }
633}
634
635/**
636 * sd_init_command - build a scsi (read or write) command from
637 * information in the request structure.
638 * @SCpnt: pointer to mid-level's per scsi command structure that
639 * contains request and into which the scsi command is written
640 *
641 * Returns 1 if successful and 0 if error (or cannot be done now).
642 **/
643static int sd_prep_fn(struct request_queue *q, struct request *rq)
644{
645 struct scsi_cmnd *SCpnt;
646 struct scsi_device *sdp = q->queuedata;
647 struct gendisk *disk = rq->rq_disk;
648 struct scsi_disk *sdkp;
649 sector_t block = blk_rq_pos(rq);
650 sector_t threshold;
651 unsigned int this_count = blk_rq_sectors(rq);
652 int ret, host_dif;
653 unsigned char protect;
654
655 /*
656 * Discard request come in as REQ_TYPE_FS but we turn them into
657 * block PC requests to make life easier.
658 */
659 if (rq->cmd_flags & REQ_DISCARD) {
660 ret = scsi_setup_discard_cmnd(sdp, rq);
661 goto out;
662 } else if (rq->cmd_flags & REQ_FLUSH) {
663 ret = scsi_setup_flush_cmnd(sdp, rq);
664 goto out;
665 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
666 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
667 goto out;
668 } else if (rq->cmd_type != REQ_TYPE_FS) {
669 ret = BLKPREP_KILL;
670 goto out;
671 }
672 ret = scsi_setup_fs_cmnd(sdp, rq);
673 if (ret != BLKPREP_OK)
674 goto out;
675 SCpnt = rq->special;
676 sdkp = scsi_disk(disk);
677
678 /* from here on until we're complete, any goto out
679 * is used for a killable error condition */
680 ret = BLKPREP_KILL;
681
682 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
683 "sd_init_command: block=%llu, "
684 "count=%d\n",
685 (unsigned long long)block,
686 this_count));
687
688 if (!sdp || !scsi_device_online(sdp) ||
689 block + blk_rq_sectors(rq) > get_capacity(disk)) {
690 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
691 "Finishing %u sectors\n",
692 blk_rq_sectors(rq)));
693 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
694 "Retry with 0x%p\n", SCpnt));
695 goto out;
696 }
697
698 if (sdp->changed) {
699 /*
700 * quietly refuse to do anything to a changed disc until
701 * the changed bit has been reset
702 */
703 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
704 goto out;
705 }
706
707 /*
708 * Some SD card readers can't handle multi-sector accesses which touch
709 * the last one or two hardware sectors. Split accesses as needed.
710 */
711 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
712 (sdp->sector_size / 512);
713
714 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
715 if (block < threshold) {
716 /* Access up to the threshold but not beyond */
717 this_count = threshold - block;
718 } else {
719 /* Access only a single hardware sector */
720 this_count = sdp->sector_size / 512;
721 }
722 }
723
724 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
725 (unsigned long long)block));
726
727 /*
728 * If we have a 1K hardware sectorsize, prevent access to single
729 * 512 byte sectors. In theory we could handle this - in fact
730 * the scsi cdrom driver must be able to handle this because
731 * we typically use 1K blocksizes, and cdroms typically have
732 * 2K hardware sectorsizes. Of course, things are simpler
733 * with the cdrom, since it is read-only. For performance
734 * reasons, the filesystems should be able to handle this
735 * and not force the scsi disk driver to use bounce buffers
736 * for this.
737 */
738 if (sdp->sector_size == 1024) {
739 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
740 scmd_printk(KERN_ERR, SCpnt,
741 "Bad block number requested\n");
742 goto out;
743 } else {
744 block = block >> 1;
745 this_count = this_count >> 1;
746 }
747 }
748 if (sdp->sector_size == 2048) {
749 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
750 scmd_printk(KERN_ERR, SCpnt,
751 "Bad block number requested\n");
752 goto out;
753 } else {
754 block = block >> 2;
755 this_count = this_count >> 2;
756 }
757 }
758 if (sdp->sector_size == 4096) {
759 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
760 scmd_printk(KERN_ERR, SCpnt,
761 "Bad block number requested\n");
762 goto out;
763 } else {
764 block = block >> 3;
765 this_count = this_count >> 3;
766 }
767 }
768 if (rq_data_dir(rq) == WRITE) {
769 if (!sdp->writeable) {
770 goto out;
771 }
772 SCpnt->cmnd[0] = WRITE_6;
773 SCpnt->sc_data_direction = DMA_TO_DEVICE;
774
775 if (blk_integrity_rq(rq) &&
776 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
777 goto out;
778
779 } else if (rq_data_dir(rq) == READ) {
780 SCpnt->cmnd[0] = READ_6;
781 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
782 } else {
783 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
784 goto out;
785 }
786
787 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
788 "%s %d/%u 512 byte blocks.\n",
789 (rq_data_dir(rq) == WRITE) ?
790 "writing" : "reading", this_count,
791 blk_rq_sectors(rq)));
792
793 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
794 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
795 if (host_dif)
796 protect = 1 << 5;
797 else
798 protect = 0;
799
800 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
801 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
802
803 if (unlikely(SCpnt->cmnd == NULL)) {
804 ret = BLKPREP_DEFER;
805 goto out;
806 }
807
808 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
809 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
810 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
811 SCpnt->cmnd[7] = 0x18;
812 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
813 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
814
815 /* LBA */
816 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
817 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
818 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
819 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
820 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
821 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
822 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
823 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
824
825 /* Expected Indirect LBA */
826 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
827 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
828 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
829 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
830
831 /* Transfer length */
832 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
833 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
834 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
835 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
836 } else if (block > 0xffffffff) {
837 SCpnt->cmnd[0] += READ_16 - READ_6;
838 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
839 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
840 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
841 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
842 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
843 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
844 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
845 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
846 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
847 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
848 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
849 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
850 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
851 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
852 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
853 scsi_device_protection(SCpnt->device) ||
854 SCpnt->device->use_10_for_rw) {
855 if (this_count > 0xffff)
856 this_count = 0xffff;
857
858 SCpnt->cmnd[0] += READ_10 - READ_6;
859 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
860 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
861 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
862 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
863 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
864 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
865 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
866 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
867 } else {
868 if (unlikely(rq->cmd_flags & REQ_FUA)) {
869 /*
870 * This happens only if this drive failed
871 * 10byte rw command with ILLEGAL_REQUEST
872 * during operation and thus turned off
873 * use_10_for_rw.
874 */
875 scmd_printk(KERN_ERR, SCpnt,
876 "FUA write on READ/WRITE(6) drive\n");
877 goto out;
878 }
879
880 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
881 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
882 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
883 SCpnt->cmnd[4] = (unsigned char) this_count;
884 SCpnt->cmnd[5] = 0;
885 }
886 SCpnt->sdb.length = this_count * sdp->sector_size;
887
888 /* If DIF or DIX is enabled, tell HBA how to handle request */
889 if (host_dif || scsi_prot_sg_count(SCpnt))
890 sd_prot_op(SCpnt, host_dif);
891
892 /*
893 * We shouldn't disconnect in the middle of a sector, so with a dumb
894 * host adapter, it's safe to assume that we can at least transfer
895 * this many bytes between each connect / disconnect.
896 */
897 SCpnt->transfersize = sdp->sector_size;
898 SCpnt->underflow = this_count << 9;
899 SCpnt->allowed = SD_MAX_RETRIES;
900
901 /*
902 * This indicates that the command is ready from our end to be
903 * queued.
904 */
905 ret = BLKPREP_OK;
906 out:
907 return scsi_prep_return(q, rq, ret);
908}
909
910/**
911 * sd_open - open a scsi disk device
912 * @inode: only i_rdev member may be used
913 * @filp: only f_mode and f_flags may be used
914 *
915 * Returns 0 if successful. Returns a negated errno value in case
916 * of error.
917 *
918 * Note: This can be called from a user context (e.g. fsck(1) )
919 * or from within the kernel (e.g. as a result of a mount(1) ).
920 * In the latter case @inode and @filp carry an abridged amount
921 * of information as noted above.
922 *
923 * Locking: called with bdev->bd_mutex held.
924 **/
925static int sd_open(struct block_device *bdev, fmode_t mode)
926{
927 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
928 struct scsi_device *sdev;
929 int retval;
930
931 if (!sdkp)
932 return -ENXIO;
933
934 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
935
936 sdev = sdkp->device;
937
938 retval = scsi_autopm_get_device(sdev);
939 if (retval)
940 goto error_autopm;
941
942 /*
943 * If the device is in error recovery, wait until it is done.
944 * If the device is offline, then disallow any access to it.
945 */
946 retval = -ENXIO;
947 if (!scsi_block_when_processing_errors(sdev))
948 goto error_out;
949
950 if (sdev->removable || sdkp->write_prot)
951 check_disk_change(bdev);
952
953 /*
954 * If the drive is empty, just let the open fail.
955 */
956 retval = -ENOMEDIUM;
957 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
958 goto error_out;
959
960 /*
961 * If the device has the write protect tab set, have the open fail
962 * if the user expects to be able to write to the thing.
963 */
964 retval = -EROFS;
965 if (sdkp->write_prot && (mode & FMODE_WRITE))
966 goto error_out;
967
968 /*
969 * It is possible that the disk changing stuff resulted in
970 * the device being taken offline. If this is the case,
971 * report this to the user, and don't pretend that the
972 * open actually succeeded.
973 */
974 retval = -ENXIO;
975 if (!scsi_device_online(sdev))
976 goto error_out;
977
978 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
979 if (scsi_block_when_processing_errors(sdev))
980 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
981 }
982
983 return 0;
984
985error_out:
986 scsi_autopm_put_device(sdev);
987error_autopm:
988 scsi_disk_put(sdkp);
989 return retval;
990}
991
992/**
993 * sd_release - invoked when the (last) close(2) is called on this
994 * scsi disk.
995 * @inode: only i_rdev member may be used
996 * @filp: only f_mode and f_flags may be used
997 *
998 * Returns 0.
999 *
1000 * Note: may block (uninterruptible) if error recovery is underway
1001 * on this disk.
1002 *
1003 * Locking: called with bdev->bd_mutex held.
1004 **/
1005static int sd_release(struct gendisk *disk, fmode_t mode)
1006{
1007 struct scsi_disk *sdkp = scsi_disk(disk);
1008 struct scsi_device *sdev = sdkp->device;
1009
1010 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1011
1012 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1013 if (scsi_block_when_processing_errors(sdev))
1014 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1015 }
1016
1017 /*
1018 * XXX and what if there are packets in flight and this close()
1019 * XXX is followed by a "rmmod sd_mod"?
1020 */
1021
1022 scsi_autopm_put_device(sdev);
1023 scsi_disk_put(sdkp);
1024 return 0;
1025}
1026
1027static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1028{
1029 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1030 struct scsi_device *sdp = sdkp->device;
1031 struct Scsi_Host *host = sdp->host;
1032 int diskinfo[4];
1033
1034 /* default to most commonly used values */
1035 diskinfo[0] = 0x40; /* 1 << 6 */
1036 diskinfo[1] = 0x20; /* 1 << 5 */
1037 diskinfo[2] = sdkp->capacity >> 11;
1038
1039 /* override with calculated, extended default, or driver values */
1040 if (host->hostt->bios_param)
1041 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1042 else
1043 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1044
1045 geo->heads = diskinfo[0];
1046 geo->sectors = diskinfo[1];
1047 geo->cylinders = diskinfo[2];
1048 return 0;
1049}
1050
1051/**
1052 * sd_ioctl - process an ioctl
1053 * @inode: only i_rdev/i_bdev members may be used
1054 * @filp: only f_mode and f_flags may be used
1055 * @cmd: ioctl command number
1056 * @arg: this is third argument given to ioctl(2) system call.
1057 * Often contains a pointer.
1058 *
1059 * Returns 0 if successful (some ioctls return positive numbers on
1060 * success as well). Returns a negated errno value in case of error.
1061 *
1062 * Note: most ioctls are forward onto the block subsystem or further
1063 * down in the scsi subsystem.
1064 **/
1065static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1066 unsigned int cmd, unsigned long arg)
1067{
1068 struct gendisk *disk = bdev->bd_disk;
1069 struct scsi_device *sdp = scsi_disk(disk)->device;
1070 void __user *p = (void __user *)arg;
1071 int error;
1072
1073 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
1074 disk->disk_name, cmd));
1075
1076 /*
1077 * If we are in the middle of error recovery, don't let anyone
1078 * else try and use this device. Also, if error recovery fails, it
1079 * may try and take the device offline, in which case all further
1080 * access to the device is prohibited.
1081 */
1082 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1083 (mode & FMODE_NDELAY) != 0);
1084 if (!scsi_block_when_processing_errors(sdp) || !error)
1085 goto out;
1086
1087 /*
1088 * Send SCSI addressing ioctls directly to mid level, send other
1089 * ioctls to block level and then onto mid level if they can't be
1090 * resolved.
1091 */
1092 switch (cmd) {
1093 case SCSI_IOCTL_GET_IDLUN:
1094 case SCSI_IOCTL_GET_BUS_NUMBER:
1095 error = scsi_ioctl(sdp, cmd, p);
1096 break;
1097 default:
1098 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
1099 if (error != -ENOTTY)
1100 break;
1101 error = scsi_ioctl(sdp, cmd, p);
1102 break;
1103 }
1104out:
1105 return error;
1106}
1107
1108static void set_media_not_present(struct scsi_disk *sdkp)
1109{
1110 if (sdkp->media_present)
1111 sdkp->device->changed = 1;
1112
1113 if (sdkp->device->removable) {
1114 sdkp->media_present = 0;
1115 sdkp->capacity = 0;
1116 }
1117}
1118
1119static int media_not_present(struct scsi_disk *sdkp,
1120 struct scsi_sense_hdr *sshdr)
1121{
1122 if (!scsi_sense_valid(sshdr))
1123 return 0;
1124
1125 /* not invoked for commands that could return deferred errors */
1126 switch (sshdr->sense_key) {
1127 case UNIT_ATTENTION:
1128 case NOT_READY:
1129 /* medium not present */
1130 if (sshdr->asc == 0x3A) {
1131 set_media_not_present(sdkp);
1132 return 1;
1133 }
1134 }
1135 return 0;
1136}
1137
1138/**
1139 * sd_check_events - check media events
1140 * @disk: kernel device descriptor
1141 * @clearing: disk events currently being cleared
1142 *
1143 * Returns mask of DISK_EVENT_*.
1144 *
1145 * Note: this function is invoked from the block subsystem.
1146 **/
1147static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1148{
1149 struct scsi_disk *sdkp = scsi_disk(disk);
1150 struct scsi_device *sdp = sdkp->device;
1151 struct scsi_sense_hdr *sshdr = NULL;
1152 int retval;
1153
1154 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1155
1156 /*
1157 * If the device is offline, don't send any commands - just pretend as
1158 * if the command failed. If the device ever comes back online, we
1159 * can deal with it then. It is only because of unrecoverable errors
1160 * that we would ever take a device offline in the first place.
1161 */
1162 if (!scsi_device_online(sdp)) {
1163 set_media_not_present(sdkp);
1164 goto out;
1165 }
1166
1167 /*
1168 * Using TEST_UNIT_READY enables differentiation between drive with
1169 * no cartridge loaded - NOT READY, drive with changed cartridge -
1170 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1171 *
1172 * Drives that auto spin down. eg iomega jaz 1G, will be started
1173 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1174 * sd_revalidate() is called.
1175 */
1176 retval = -ENODEV;
1177
1178 if (scsi_block_when_processing_errors(sdp)) {
1179 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1180 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1181 sshdr);
1182 }
1183
1184 /* failed to execute TUR, assume media not present */
1185 if (host_byte(retval)) {
1186 set_media_not_present(sdkp);
1187 goto out;
1188 }
1189
1190 if (media_not_present(sdkp, sshdr))
1191 goto out;
1192
1193 /*
1194 * For removable scsi disk we have to recognise the presence
1195 * of a disk in the drive.
1196 */
1197 if (!sdkp->media_present)
1198 sdp->changed = 1;
1199 sdkp->media_present = 1;
1200out:
1201 /*
1202 * sdp->changed is set under the following conditions:
1203 *
1204 * Medium present state has changed in either direction.
1205 * Device has indicated UNIT_ATTENTION.
1206 */
1207 kfree(sshdr);
1208 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1209 sdp->changed = 0;
1210 return retval;
1211}
1212
1213static int sd_sync_cache(struct scsi_disk *sdkp)
1214{
1215 int retries, res;
1216 struct scsi_device *sdp = sdkp->device;
1217 struct scsi_sense_hdr sshdr;
1218
1219 if (!scsi_device_online(sdp))
1220 return -ENODEV;
1221
1222
1223 for (retries = 3; retries > 0; --retries) {
1224 unsigned char cmd[10] = { 0 };
1225
1226 cmd[0] = SYNCHRONIZE_CACHE;
1227 /*
1228 * Leave the rest of the command zero to indicate
1229 * flush everything.
1230 */
1231 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1232 SD_FLUSH_TIMEOUT, SD_MAX_RETRIES, NULL);
1233 if (res == 0)
1234 break;
1235 }
1236
1237 if (res) {
1238 sd_print_result(sdkp, res);
1239 if (driver_byte(res) & DRIVER_SENSE)
1240 sd_print_sense_hdr(sdkp, &sshdr);
1241 }
1242
1243 if (res)
1244 return -EIO;
1245 return 0;
1246}
1247
1248static void sd_rescan(struct device *dev)
1249{
1250 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1251
1252 if (sdkp) {
1253 revalidate_disk(sdkp->disk);
1254 scsi_disk_put(sdkp);
1255 }
1256}
1257
1258
1259#ifdef CONFIG_COMPAT
1260/*
1261 * This gets directly called from VFS. When the ioctl
1262 * is not recognized we go back to the other translation paths.
1263 */
1264static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1265 unsigned int cmd, unsigned long arg)
1266{
1267 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1268
1269 /*
1270 * If we are in the middle of error recovery, don't let anyone
1271 * else try and use this device. Also, if error recovery fails, it
1272 * may try and take the device offline, in which case all further
1273 * access to the device is prohibited.
1274 */
1275 if (!scsi_block_when_processing_errors(sdev))
1276 return -ENODEV;
1277
1278 if (sdev->host->hostt->compat_ioctl) {
1279 int ret;
1280
1281 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1282
1283 return ret;
1284 }
1285
1286 /*
1287 * Let the static ioctl translation table take care of it.
1288 */
1289 return -ENOIOCTLCMD;
1290}
1291#endif
1292
1293static const struct block_device_operations sd_fops = {
1294 .owner = THIS_MODULE,
1295 .open = sd_open,
1296 .release = sd_release,
1297 .ioctl = sd_ioctl,
1298 .getgeo = sd_getgeo,
1299#ifdef CONFIG_COMPAT
1300 .compat_ioctl = sd_compat_ioctl,
1301#endif
1302 .check_events = sd_check_events,
1303 .revalidate_disk = sd_revalidate_disk,
1304 .unlock_native_capacity = sd_unlock_native_capacity,
1305};
1306
1307static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1308{
1309 u64 start_lba = blk_rq_pos(scmd->request);
1310 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1311 u64 bad_lba;
1312 int info_valid;
1313 /*
1314 * resid is optional but mostly filled in. When it's unused,
1315 * its value is zero, so we assume the whole buffer transferred
1316 */
1317 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1318 unsigned int good_bytes;
1319
1320 if (scmd->request->cmd_type != REQ_TYPE_FS)
1321 return 0;
1322
1323 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1324 SCSI_SENSE_BUFFERSIZE,
1325 &bad_lba);
1326 if (!info_valid)
1327 return 0;
1328
1329 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1330 return 0;
1331
1332 if (scmd->device->sector_size < 512) {
1333 /* only legitimate sector_size here is 256 */
1334 start_lba <<= 1;
1335 end_lba <<= 1;
1336 } else {
1337 /* be careful ... don't want any overflows */
1338 u64 factor = scmd->device->sector_size / 512;
1339 do_div(start_lba, factor);
1340 do_div(end_lba, factor);
1341 }
1342
1343 /* The bad lba was reported incorrectly, we have no idea where
1344 * the error is.
1345 */
1346 if (bad_lba < start_lba || bad_lba >= end_lba)
1347 return 0;
1348
1349 /* This computation should always be done in terms of
1350 * the resolution of the device's medium.
1351 */
1352 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1353 return min(good_bytes, transferred);
1354}
1355
1356/**
1357 * sd_done - bottom half handler: called when the lower level
1358 * driver has completed (successfully or otherwise) a scsi command.
1359 * @SCpnt: mid-level's per command structure.
1360 *
1361 * Note: potentially run from within an ISR. Must not block.
1362 **/
1363static int sd_done(struct scsi_cmnd *SCpnt)
1364{
1365 int result = SCpnt->result;
1366 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1367 struct scsi_sense_hdr sshdr;
1368 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1369 int sense_valid = 0;
1370 int sense_deferred = 0;
1371 unsigned char op = SCpnt->cmnd[0];
1372
1373 if ((SCpnt->request->cmd_flags & REQ_DISCARD) && !result)
1374 scsi_set_resid(SCpnt, 0);
1375
1376 if (result) {
1377 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1378 if (sense_valid)
1379 sense_deferred = scsi_sense_is_deferred(&sshdr);
1380 }
1381#ifdef CONFIG_SCSI_LOGGING
1382 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1383 if (sense_valid) {
1384 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1385 "sd_done: sb[respc,sk,asc,"
1386 "ascq]=%x,%x,%x,%x\n",
1387 sshdr.response_code,
1388 sshdr.sense_key, sshdr.asc,
1389 sshdr.ascq));
1390 }
1391#endif
1392 if (driver_byte(result) != DRIVER_SENSE &&
1393 (!sense_valid || sense_deferred))
1394 goto out;
1395
1396 switch (sshdr.sense_key) {
1397 case HARDWARE_ERROR:
1398 case MEDIUM_ERROR:
1399 good_bytes = sd_completed_bytes(SCpnt);
1400 break;
1401 case RECOVERED_ERROR:
1402 good_bytes = scsi_bufflen(SCpnt);
1403 break;
1404 case NO_SENSE:
1405 /* This indicates a false check condition, so ignore it. An
1406 * unknown amount of data was transferred so treat it as an
1407 * error.
1408 */
1409 scsi_print_sense("sd", SCpnt);
1410 SCpnt->result = 0;
1411 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1412 break;
1413 case ABORTED_COMMAND:
1414 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1415 good_bytes = sd_completed_bytes(SCpnt);
1416 break;
1417 case ILLEGAL_REQUEST:
1418 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1419 good_bytes = sd_completed_bytes(SCpnt);
1420 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1421 if ((sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1422 (op == UNMAP || op == WRITE_SAME_16 || op == WRITE_SAME))
1423 sd_config_discard(sdkp, SD_LBP_DISABLE);
1424 break;
1425 default:
1426 break;
1427 }
1428 out:
1429 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1430 sd_dif_complete(SCpnt, good_bytes);
1431
1432 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1433 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd) {
1434
1435 /* We have to print a failed command here as the
1436 * extended CDB gets freed before scsi_io_completion()
1437 * is called.
1438 */
1439 if (result)
1440 scsi_print_command(SCpnt);
1441
1442 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1443 SCpnt->cmnd = NULL;
1444 SCpnt->cmd_len = 0;
1445 }
1446
1447 return good_bytes;
1448}
1449
1450/*
1451 * spinup disk - called only in sd_revalidate_disk()
1452 */
1453static void
1454sd_spinup_disk(struct scsi_disk *sdkp)
1455{
1456 unsigned char cmd[10];
1457 unsigned long spintime_expire = 0;
1458 int retries, spintime;
1459 unsigned int the_result;
1460 struct scsi_sense_hdr sshdr;
1461 int sense_valid = 0;
1462
1463 spintime = 0;
1464
1465 /* Spin up drives, as required. Only do this at boot time */
1466 /* Spinup needs to be done for module loads too. */
1467 do {
1468 retries = 0;
1469
1470 do {
1471 cmd[0] = TEST_UNIT_READY;
1472 memset((void *) &cmd[1], 0, 9);
1473
1474 the_result = scsi_execute_req(sdkp->device, cmd,
1475 DMA_NONE, NULL, 0,
1476 &sshdr, SD_TIMEOUT,
1477 SD_MAX_RETRIES, NULL);
1478
1479 /*
1480 * If the drive has indicated to us that it
1481 * doesn't have any media in it, don't bother
1482 * with any more polling.
1483 */
1484 if (media_not_present(sdkp, &sshdr))
1485 return;
1486
1487 if (the_result)
1488 sense_valid = scsi_sense_valid(&sshdr);
1489 retries++;
1490 } while (retries < 3 &&
1491 (!scsi_status_is_good(the_result) ||
1492 ((driver_byte(the_result) & DRIVER_SENSE) &&
1493 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1494
1495 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1496 /* no sense, TUR either succeeded or failed
1497 * with a status error */
1498 if(!spintime && !scsi_status_is_good(the_result)) {
1499 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1500 sd_print_result(sdkp, the_result);
1501 }
1502 break;
1503 }
1504
1505 /*
1506 * The device does not want the automatic start to be issued.
1507 */
1508 if (sdkp->device->no_start_on_add)
1509 break;
1510
1511 if (sense_valid && sshdr.sense_key == NOT_READY) {
1512 if (sshdr.asc == 4 && sshdr.ascq == 3)
1513 break; /* manual intervention required */
1514 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1515 break; /* standby */
1516 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1517 break; /* unavailable */
1518 /*
1519 * Issue command to spin up drive when not ready
1520 */
1521 if (!spintime) {
1522 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1523 cmd[0] = START_STOP;
1524 cmd[1] = 1; /* Return immediately */
1525 memset((void *) &cmd[2], 0, 8);
1526 cmd[4] = 1; /* Start spin cycle */
1527 if (sdkp->device->start_stop_pwr_cond)
1528 cmd[4] |= 1 << 4;
1529 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1530 NULL, 0, &sshdr,
1531 SD_TIMEOUT, SD_MAX_RETRIES,
1532 NULL);
1533 spintime_expire = jiffies + 100 * HZ;
1534 spintime = 1;
1535 }
1536 /* Wait 1 second for next try */
1537 msleep(1000);
1538 printk(".");
1539
1540 /*
1541 * Wait for USB flash devices with slow firmware.
1542 * Yes, this sense key/ASC combination shouldn't
1543 * occur here. It's characteristic of these devices.
1544 */
1545 } else if (sense_valid &&
1546 sshdr.sense_key == UNIT_ATTENTION &&
1547 sshdr.asc == 0x28) {
1548 if (!spintime) {
1549 spintime_expire = jiffies + 5 * HZ;
1550 spintime = 1;
1551 }
1552 /* Wait 1 second for next try */
1553 msleep(1000);
1554 } else {
1555 /* we don't understand the sense code, so it's
1556 * probably pointless to loop */
1557 if(!spintime) {
1558 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1559 sd_print_sense_hdr(sdkp, &sshdr);
1560 }
1561 break;
1562 }
1563
1564 } while (spintime && time_before_eq(jiffies, spintime_expire));
1565
1566 if (spintime) {
1567 if (scsi_status_is_good(the_result))
1568 printk("ready\n");
1569 else
1570 printk("not responding...\n");
1571 }
1572}
1573
1574
1575/*
1576 * Determine whether disk supports Data Integrity Field.
1577 */
1578static void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1579{
1580 struct scsi_device *sdp = sdkp->device;
1581 u8 type;
1582
1583 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1584 return;
1585
1586 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1587
1588 if (type == sdkp->protection_type || !sdkp->first_scan)
1589 return;
1590
1591 sdkp->protection_type = type;
1592
1593 if (type > SD_DIF_TYPE3_PROTECTION) {
1594 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1595 "protection type %u. Disabling disk!\n", type);
1596 sdkp->capacity = 0;
1597 return;
1598 }
1599
1600 if (scsi_host_dif_capable(sdp->host, type))
1601 sd_printk(KERN_NOTICE, sdkp,
1602 "Enabling DIF Type %u protection\n", type);
1603 else
1604 sd_printk(KERN_NOTICE, sdkp,
1605 "Disabling DIF Type %u protection\n", type);
1606}
1607
1608static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1609 struct scsi_sense_hdr *sshdr, int sense_valid,
1610 int the_result)
1611{
1612 sd_print_result(sdkp, the_result);
1613 if (driver_byte(the_result) & DRIVER_SENSE)
1614 sd_print_sense_hdr(sdkp, sshdr);
1615 else
1616 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1617
1618 /*
1619 * Set dirty bit for removable devices if not ready -
1620 * sometimes drives will not report this properly.
1621 */
1622 if (sdp->removable &&
1623 sense_valid && sshdr->sense_key == NOT_READY)
1624 set_media_not_present(sdkp);
1625
1626 /*
1627 * We used to set media_present to 0 here to indicate no media
1628 * in the drive, but some drives fail read capacity even with
1629 * media present, so we can't do that.
1630 */
1631 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1632}
1633
1634#define RC16_LEN 32
1635#if RC16_LEN > SD_BUF_SIZE
1636#error RC16_LEN must not be more than SD_BUF_SIZE
1637#endif
1638
1639#define READ_CAPACITY_RETRIES_ON_RESET 10
1640
1641static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1642 unsigned char *buffer)
1643{
1644 unsigned char cmd[16];
1645 struct scsi_sense_hdr sshdr;
1646 int sense_valid = 0;
1647 int the_result;
1648 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1649 unsigned int alignment;
1650 unsigned long long lba;
1651 unsigned sector_size;
1652
1653 if (sdp->no_read_capacity_16)
1654 return -EINVAL;
1655
1656 do {
1657 memset(cmd, 0, 16);
1658 cmd[0] = SERVICE_ACTION_IN;
1659 cmd[1] = SAI_READ_CAPACITY_16;
1660 cmd[13] = RC16_LEN;
1661 memset(buffer, 0, RC16_LEN);
1662
1663 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1664 buffer, RC16_LEN, &sshdr,
1665 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1666
1667 if (media_not_present(sdkp, &sshdr))
1668 return -ENODEV;
1669
1670 if (the_result) {
1671 sense_valid = scsi_sense_valid(&sshdr);
1672 if (sense_valid &&
1673 sshdr.sense_key == ILLEGAL_REQUEST &&
1674 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1675 sshdr.ascq == 0x00)
1676 /* Invalid Command Operation Code or
1677 * Invalid Field in CDB, just retry
1678 * silently with RC10 */
1679 return -EINVAL;
1680 if (sense_valid &&
1681 sshdr.sense_key == UNIT_ATTENTION &&
1682 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1683 /* Device reset might occur several times,
1684 * give it one more chance */
1685 if (--reset_retries > 0)
1686 continue;
1687 }
1688 retries--;
1689
1690 } while (the_result && retries);
1691
1692 if (the_result) {
1693 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1694 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1695 return -EINVAL;
1696 }
1697
1698 sector_size = get_unaligned_be32(&buffer[8]);
1699 lba = get_unaligned_be64(&buffer[0]);
1700
1701 sd_read_protection_type(sdkp, buffer);
1702
1703 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1704 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1705 "kernel compiled with support for large block "
1706 "devices.\n");
1707 sdkp->capacity = 0;
1708 return -EOVERFLOW;
1709 }
1710
1711 /* Logical blocks per physical block exponent */
1712 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
1713
1714 /* Lowest aligned logical block */
1715 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1716 blk_queue_alignment_offset(sdp->request_queue, alignment);
1717 if (alignment && sdkp->first_scan)
1718 sd_printk(KERN_NOTICE, sdkp,
1719 "physical block alignment offset: %u\n", alignment);
1720
1721 if (buffer[14] & 0x80) { /* LBPME */
1722 sdkp->lbpme = 1;
1723
1724 if (buffer[14] & 0x40) /* LBPRZ */
1725 sdkp->lbprz = 1;
1726
1727 sd_config_discard(sdkp, SD_LBP_WS16);
1728 }
1729
1730 sdkp->capacity = lba + 1;
1731 return sector_size;
1732}
1733
1734static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1735 unsigned char *buffer)
1736{
1737 unsigned char cmd[16];
1738 struct scsi_sense_hdr sshdr;
1739 int sense_valid = 0;
1740 int the_result;
1741 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1742 sector_t lba;
1743 unsigned sector_size;
1744
1745 do {
1746 cmd[0] = READ_CAPACITY;
1747 memset(&cmd[1], 0, 9);
1748 memset(buffer, 0, 8);
1749
1750 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1751 buffer, 8, &sshdr,
1752 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1753
1754 if (media_not_present(sdkp, &sshdr))
1755 return -ENODEV;
1756
1757 if (the_result) {
1758 sense_valid = scsi_sense_valid(&sshdr);
1759 if (sense_valid &&
1760 sshdr.sense_key == UNIT_ATTENTION &&
1761 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
1762 /* Device reset might occur several times,
1763 * give it one more chance */
1764 if (--reset_retries > 0)
1765 continue;
1766 }
1767 retries--;
1768
1769 } while (the_result && retries);
1770
1771 if (the_result) {
1772 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1773 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1774 return -EINVAL;
1775 }
1776
1777 sector_size = get_unaligned_be32(&buffer[4]);
1778 lba = get_unaligned_be32(&buffer[0]);
1779
1780 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
1781 /* Some buggy (usb cardreader) devices return an lba of
1782 0xffffffff when the want to report a size of 0 (with
1783 which they really mean no media is present) */
1784 sdkp->capacity = 0;
1785 sdkp->physical_block_size = sector_size;
1786 return sector_size;
1787 }
1788
1789 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1790 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1791 "kernel compiled with support for large block "
1792 "devices.\n");
1793 sdkp->capacity = 0;
1794 return -EOVERFLOW;
1795 }
1796
1797 sdkp->capacity = lba + 1;
1798 sdkp->physical_block_size = sector_size;
1799 return sector_size;
1800}
1801
1802static int sd_try_rc16_first(struct scsi_device *sdp)
1803{
1804 if (sdp->host->max_cmd_len < 16)
1805 return 0;
1806 if (sdp->scsi_level > SCSI_SPC_2)
1807 return 1;
1808 if (scsi_device_protection(sdp))
1809 return 1;
1810 return 0;
1811}
1812
1813/*
1814 * read disk capacity
1815 */
1816static void
1817sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1818{
1819 int sector_size;
1820 struct scsi_device *sdp = sdkp->device;
1821 sector_t old_capacity = sdkp->capacity;
1822
1823 if (sd_try_rc16_first(sdp)) {
1824 sector_size = read_capacity_16(sdkp, sdp, buffer);
1825 if (sector_size == -EOVERFLOW)
1826 goto got_data;
1827 if (sector_size == -ENODEV)
1828 return;
1829 if (sector_size < 0)
1830 sector_size = read_capacity_10(sdkp, sdp, buffer);
1831 if (sector_size < 0)
1832 return;
1833 } else {
1834 sector_size = read_capacity_10(sdkp, sdp, buffer);
1835 if (sector_size == -EOVERFLOW)
1836 goto got_data;
1837 if (sector_size < 0)
1838 return;
1839 if ((sizeof(sdkp->capacity) > 4) &&
1840 (sdkp->capacity > 0xffffffffULL)) {
1841 int old_sector_size = sector_size;
1842 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1843 "Trying to use READ CAPACITY(16).\n");
1844 sector_size = read_capacity_16(sdkp, sdp, buffer);
1845 if (sector_size < 0) {
1846 sd_printk(KERN_NOTICE, sdkp,
1847 "Using 0xffffffff as device size\n");
1848 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1849 sector_size = old_sector_size;
1850 goto got_data;
1851 }
1852 }
1853 }
1854
1855 /* Some devices are known to return the total number of blocks,
1856 * not the highest block number. Some devices have versions
1857 * which do this and others which do not. Some devices we might
1858 * suspect of doing this but we don't know for certain.
1859 *
1860 * If we know the reported capacity is wrong, decrement it. If
1861 * we can only guess, then assume the number of blocks is even
1862 * (usually true but not always) and err on the side of lowering
1863 * the capacity.
1864 */
1865 if (sdp->fix_capacity ||
1866 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1867 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1868 "from its reported value: %llu\n",
1869 (unsigned long long) sdkp->capacity);
1870 --sdkp->capacity;
1871 }
1872
1873got_data:
1874 if (sector_size == 0) {
1875 sector_size = 512;
1876 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1877 "assuming 512.\n");
1878 }
1879
1880 if (sector_size != 512 &&
1881 sector_size != 1024 &&
1882 sector_size != 2048 &&
1883 sector_size != 4096 &&
1884 sector_size != 256) {
1885 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1886 sector_size);
1887 /*
1888 * The user might want to re-format the drive with
1889 * a supported sectorsize. Once this happens, it
1890 * would be relatively trivial to set the thing up.
1891 * For this reason, we leave the thing in the table.
1892 */
1893 sdkp->capacity = 0;
1894 /*
1895 * set a bogus sector size so the normal read/write
1896 * logic in the block layer will eventually refuse any
1897 * request on this device without tripping over power
1898 * of two sector size assumptions
1899 */
1900 sector_size = 512;
1901 }
1902 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1903
1904 {
1905 char cap_str_2[10], cap_str_10[10];
1906 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1907
1908 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1909 sizeof(cap_str_2));
1910 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1911 sizeof(cap_str_10));
1912
1913 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1914 sd_printk(KERN_NOTICE, sdkp,
1915 "%llu %d-byte logical blocks: (%s/%s)\n",
1916 (unsigned long long)sdkp->capacity,
1917 sector_size, cap_str_10, cap_str_2);
1918
1919 if (sdkp->physical_block_size != sector_size)
1920 sd_printk(KERN_NOTICE, sdkp,
1921 "%u-byte physical blocks\n",
1922 sdkp->physical_block_size);
1923 }
1924 }
1925
1926 /* Rescale capacity to 512-byte units */
1927 if (sector_size == 4096)
1928 sdkp->capacity <<= 3;
1929 else if (sector_size == 2048)
1930 sdkp->capacity <<= 2;
1931 else if (sector_size == 1024)
1932 sdkp->capacity <<= 1;
1933 else if (sector_size == 256)
1934 sdkp->capacity >>= 1;
1935
1936 blk_queue_physical_block_size(sdp->request_queue,
1937 sdkp->physical_block_size);
1938 sdkp->device->sector_size = sector_size;
1939}
1940
1941/* called with buffer of length 512 */
1942static inline int
1943sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1944 unsigned char *buffer, int len, struct scsi_mode_data *data,
1945 struct scsi_sense_hdr *sshdr)
1946{
1947 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1948 SD_TIMEOUT, SD_MAX_RETRIES, data,
1949 sshdr);
1950}
1951
1952/*
1953 * read write protect setting, if possible - called only in sd_revalidate_disk()
1954 * called with buffer of length SD_BUF_SIZE
1955 */
1956static void
1957sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1958{
1959 int res;
1960 struct scsi_device *sdp = sdkp->device;
1961 struct scsi_mode_data data;
1962 int old_wp = sdkp->write_prot;
1963
1964 set_disk_ro(sdkp->disk, 0);
1965 if (sdp->skip_ms_page_3f) {
1966 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1967 return;
1968 }
1969
1970 if (sdp->use_192_bytes_for_3f) {
1971 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1972 } else {
1973 /*
1974 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1975 * We have to start carefully: some devices hang if we ask
1976 * for more than is available.
1977 */
1978 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1979
1980 /*
1981 * Second attempt: ask for page 0 When only page 0 is
1982 * implemented, a request for page 3F may return Sense Key
1983 * 5: Illegal Request, Sense Code 24: Invalid field in
1984 * CDB.
1985 */
1986 if (!scsi_status_is_good(res))
1987 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1988
1989 /*
1990 * Third attempt: ask 255 bytes, as we did earlier.
1991 */
1992 if (!scsi_status_is_good(res))
1993 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1994 &data, NULL);
1995 }
1996
1997 if (!scsi_status_is_good(res)) {
1998 sd_printk(KERN_WARNING, sdkp,
1999 "Test WP failed, assume Write Enabled\n");
2000 } else {
2001 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2002 set_disk_ro(sdkp->disk, sdkp->write_prot);
2003 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2004 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2005 sdkp->write_prot ? "on" : "off");
2006 sd_printk(KERN_DEBUG, sdkp,
2007 "Mode Sense: %02x %02x %02x %02x\n",
2008 buffer[0], buffer[1], buffer[2], buffer[3]);
2009 }
2010 }
2011}
2012
2013/*
2014 * sd_read_cache_type - called only from sd_revalidate_disk()
2015 * called with buffer of length SD_BUF_SIZE
2016 */
2017static void
2018sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2019{
2020 int len = 0, res;
2021 struct scsi_device *sdp = sdkp->device;
2022
2023 int dbd;
2024 int modepage;
2025 int first_len;
2026 struct scsi_mode_data data;
2027 struct scsi_sense_hdr sshdr;
2028 int old_wce = sdkp->WCE;
2029 int old_rcd = sdkp->RCD;
2030 int old_dpofua = sdkp->DPOFUA;
2031
2032 first_len = 4;
2033 if (sdp->skip_ms_page_8) {
2034 if (sdp->type == TYPE_RBC)
2035 goto defaults;
2036 else {
2037 if (sdp->skip_ms_page_3f)
2038 goto defaults;
2039 modepage = 0x3F;
2040 if (sdp->use_192_bytes_for_3f)
2041 first_len = 192;
2042 dbd = 0;
2043 }
2044 } else if (sdp->type == TYPE_RBC) {
2045 modepage = 6;
2046 dbd = 8;
2047 } else {
2048 modepage = 8;
2049 dbd = 0;
2050 }
2051
2052 /* cautiously ask */
2053 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2054 &data, &sshdr);
2055
2056 if (!scsi_status_is_good(res))
2057 goto bad_sense;
2058
2059 if (!data.header_length) {
2060 modepage = 6;
2061 first_len = 0;
2062 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2063 }
2064
2065 /* that went OK, now ask for the proper length */
2066 len = data.length;
2067
2068 /*
2069 * We're only interested in the first three bytes, actually.
2070 * But the data cache page is defined for the first 20.
2071 */
2072 if (len < 3)
2073 goto bad_sense;
2074 else if (len > SD_BUF_SIZE) {
2075 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2076 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2077 len = SD_BUF_SIZE;
2078 }
2079 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2080 len = 192;
2081
2082 /* Get the data */
2083 if (len > first_len)
2084 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2085 &data, &sshdr);
2086
2087 if (scsi_status_is_good(res)) {
2088 int offset = data.header_length + data.block_descriptor_length;
2089
2090 while (offset < len) {
2091 u8 page_code = buffer[offset] & 0x3F;
2092 u8 spf = buffer[offset] & 0x40;
2093
2094 if (page_code == 8 || page_code == 6) {
2095 /* We're interested only in the first 3 bytes.
2096 */
2097 if (len - offset <= 2) {
2098 sd_printk(KERN_ERR, sdkp, "Incomplete "
2099 "mode parameter data\n");
2100 goto defaults;
2101 } else {
2102 modepage = page_code;
2103 goto Page_found;
2104 }
2105 } else {
2106 /* Go to the next page */
2107 if (spf && len - offset > 3)
2108 offset += 4 + (buffer[offset+2] << 8) +
2109 buffer[offset+3];
2110 else if (!spf && len - offset > 1)
2111 offset += 2 + buffer[offset+1];
2112 else {
2113 sd_printk(KERN_ERR, sdkp, "Incomplete "
2114 "mode parameter data\n");
2115 goto defaults;
2116 }
2117 }
2118 }
2119
2120 if (modepage == 0x3F) {
2121 sd_printk(KERN_ERR, sdkp, "No Caching mode page "
2122 "present\n");
2123 goto defaults;
2124 } else if ((buffer[offset] & 0x3f) != modepage) {
2125 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
2126 goto defaults;
2127 }
2128 Page_found:
2129 if (modepage == 8) {
2130 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2131 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2132 } else {
2133 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2134 sdkp->RCD = 0;
2135 }
2136
2137 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2138 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2139 sd_printk(KERN_NOTICE, sdkp,
2140 "Uses READ/WRITE(6), disabling FUA\n");
2141 sdkp->DPOFUA = 0;
2142 }
2143
2144 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2145 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2146 sd_printk(KERN_NOTICE, sdkp,
2147 "Write cache: %s, read cache: %s, %s\n",
2148 sdkp->WCE ? "enabled" : "disabled",
2149 sdkp->RCD ? "disabled" : "enabled",
2150 sdkp->DPOFUA ? "supports DPO and FUA"
2151 : "doesn't support DPO or FUA");
2152
2153 return;
2154 }
2155
2156bad_sense:
2157 if (scsi_sense_valid(&sshdr) &&
2158 sshdr.sense_key == ILLEGAL_REQUEST &&
2159 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2160 /* Invalid field in CDB */
2161 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2162 else
2163 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2164
2165defaults:
2166 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2167 sdkp->WCE = 0;
2168 sdkp->RCD = 0;
2169 sdkp->DPOFUA = 0;
2170}
2171
2172/*
2173 * The ATO bit indicates whether the DIF application tag is available
2174 * for use by the operating system.
2175 */
2176static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2177{
2178 int res, offset;
2179 struct scsi_device *sdp = sdkp->device;
2180 struct scsi_mode_data data;
2181 struct scsi_sense_hdr sshdr;
2182
2183 if (sdp->type != TYPE_DISK)
2184 return;
2185
2186 if (sdkp->protection_type == 0)
2187 return;
2188
2189 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2190 SD_MAX_RETRIES, &data, &sshdr);
2191
2192 if (!scsi_status_is_good(res) || !data.header_length ||
2193 data.length < 6) {
2194 sd_printk(KERN_WARNING, sdkp,
2195 "getting Control mode page failed, assume no ATO\n");
2196
2197 if (scsi_sense_valid(&sshdr))
2198 sd_print_sense_hdr(sdkp, &sshdr);
2199
2200 return;
2201 }
2202
2203 offset = data.header_length + data.block_descriptor_length;
2204
2205 if ((buffer[offset] & 0x3f) != 0x0a) {
2206 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2207 return;
2208 }
2209
2210 if ((buffer[offset + 5] & 0x80) == 0)
2211 return;
2212
2213 sdkp->ATO = 1;
2214
2215 return;
2216}
2217
2218/**
2219 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2220 * @disk: disk to query
2221 */
2222static void sd_read_block_limits(struct scsi_disk *sdkp)
2223{
2224 unsigned int sector_sz = sdkp->device->sector_size;
2225 const int vpd_len = 64;
2226 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2227
2228 if (!buffer ||
2229 /* Block Limits VPD */
2230 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2231 goto out;
2232
2233 blk_queue_io_min(sdkp->disk->queue,
2234 get_unaligned_be16(&buffer[6]) * sector_sz);
2235 blk_queue_io_opt(sdkp->disk->queue,
2236 get_unaligned_be32(&buffer[12]) * sector_sz);
2237
2238 if (buffer[3] == 0x3c) {
2239 unsigned int lba_count, desc_count;
2240
2241 sdkp->max_ws_blocks =
2242 (u32) min_not_zero(get_unaligned_be64(&buffer[36]),
2243 (u64)0xffffffff);
2244
2245 if (!sdkp->lbpme)
2246 goto out;
2247
2248 lba_count = get_unaligned_be32(&buffer[20]);
2249 desc_count = get_unaligned_be32(&buffer[24]);
2250
2251 if (lba_count && desc_count)
2252 sdkp->max_unmap_blocks = lba_count;
2253
2254 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2255
2256 if (buffer[32] & 0x80)
2257 sdkp->unmap_alignment =
2258 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2259
2260 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2261
2262 if (sdkp->max_unmap_blocks)
2263 sd_config_discard(sdkp, SD_LBP_UNMAP);
2264 else
2265 sd_config_discard(sdkp, SD_LBP_WS16);
2266
2267 } else { /* LBP VPD page tells us what to use */
2268
2269 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2270 sd_config_discard(sdkp, SD_LBP_UNMAP);
2271 else if (sdkp->lbpws)
2272 sd_config_discard(sdkp, SD_LBP_WS16);
2273 else if (sdkp->lbpws10)
2274 sd_config_discard(sdkp, SD_LBP_WS10);
2275 else
2276 sd_config_discard(sdkp, SD_LBP_DISABLE);
2277 }
2278 }
2279
2280 out:
2281 kfree(buffer);
2282}
2283
2284/**
2285 * sd_read_block_characteristics - Query block dev. characteristics
2286 * @disk: disk to query
2287 */
2288static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2289{
2290 unsigned char *buffer;
2291 u16 rot;
2292 const int vpd_len = 64;
2293
2294 buffer = kmalloc(vpd_len, GFP_KERNEL);
2295
2296 if (!buffer ||
2297 /* Block Device Characteristics VPD */
2298 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2299 goto out;
2300
2301 rot = get_unaligned_be16(&buffer[4]);
2302
2303 if (rot == 1)
2304 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2305
2306 out:
2307 kfree(buffer);
2308}
2309
2310/**
2311 * sd_read_block_provisioning - Query provisioning VPD page
2312 * @disk: disk to query
2313 */
2314static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2315{
2316 unsigned char *buffer;
2317 const int vpd_len = 8;
2318
2319 if (sdkp->lbpme == 0)
2320 return;
2321
2322 buffer = kmalloc(vpd_len, GFP_KERNEL);
2323
2324 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2325 goto out;
2326
2327 sdkp->lbpvpd = 1;
2328 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2329 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2330 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2331
2332 out:
2333 kfree(buffer);
2334}
2335
2336static int sd_try_extended_inquiry(struct scsi_device *sdp)
2337{
2338 /*
2339 * Although VPD inquiries can go to SCSI-2 type devices,
2340 * some USB ones crash on receiving them, and the pages
2341 * we currently ask for are for SPC-3 and beyond
2342 */
2343 if (sdp->scsi_level > SCSI_SPC_2)
2344 return 1;
2345 return 0;
2346}
2347
2348/**
2349 * sd_revalidate_disk - called the first time a new disk is seen,
2350 * performs disk spin up, read_capacity, etc.
2351 * @disk: struct gendisk we care about
2352 **/
2353static int sd_revalidate_disk(struct gendisk *disk)
2354{
2355 struct scsi_disk *sdkp = scsi_disk(disk);
2356 struct scsi_device *sdp = sdkp->device;
2357 unsigned char *buffer;
2358 unsigned flush = 0;
2359
2360 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2361 "sd_revalidate_disk\n"));
2362
2363 /*
2364 * If the device is offline, don't try and read capacity or any
2365 * of the other niceties.
2366 */
2367 if (!scsi_device_online(sdp))
2368 goto out;
2369
2370 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2371 if (!buffer) {
2372 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2373 "allocation failure.\n");
2374 goto out;
2375 }
2376
2377 sd_spinup_disk(sdkp);
2378
2379 /*
2380 * Without media there is no reason to ask; moreover, some devices
2381 * react badly if we do.
2382 */
2383 if (sdkp->media_present) {
2384 sd_read_capacity(sdkp, buffer);
2385
2386 if (sd_try_extended_inquiry(sdp)) {
2387 sd_read_block_provisioning(sdkp);
2388 sd_read_block_limits(sdkp);
2389 sd_read_block_characteristics(sdkp);
2390 }
2391
2392 sd_read_write_protect_flag(sdkp, buffer);
2393 sd_read_cache_type(sdkp, buffer);
2394 sd_read_app_tag_own(sdkp, buffer);
2395 }
2396
2397 sdkp->first_scan = 0;
2398
2399 /*
2400 * We now have all cache related info, determine how we deal
2401 * with flush requests.
2402 */
2403 if (sdkp->WCE) {
2404 flush |= REQ_FLUSH;
2405 if (sdkp->DPOFUA)
2406 flush |= REQ_FUA;
2407 }
2408
2409 blk_queue_flush(sdkp->disk->queue, flush);
2410
2411 set_capacity(disk, sdkp->capacity);
2412 kfree(buffer);
2413
2414 out:
2415 return 0;
2416}
2417
2418/**
2419 * sd_unlock_native_capacity - unlock native capacity
2420 * @disk: struct gendisk to set capacity for
2421 *
2422 * Block layer calls this function if it detects that partitions
2423 * on @disk reach beyond the end of the device. If the SCSI host
2424 * implements ->unlock_native_capacity() method, it's invoked to
2425 * give it a chance to adjust the device capacity.
2426 *
2427 * CONTEXT:
2428 * Defined by block layer. Might sleep.
2429 */
2430static void sd_unlock_native_capacity(struct gendisk *disk)
2431{
2432 struct scsi_device *sdev = scsi_disk(disk)->device;
2433
2434 if (sdev->host->hostt->unlock_native_capacity)
2435 sdev->host->hostt->unlock_native_capacity(sdev);
2436}
2437
2438/**
2439 * sd_format_disk_name - format disk name
2440 * @prefix: name prefix - ie. "sd" for SCSI disks
2441 * @index: index of the disk to format name for
2442 * @buf: output buffer
2443 * @buflen: length of the output buffer
2444 *
2445 * SCSI disk names starts at sda. The 26th device is sdz and the
2446 * 27th is sdaa. The last one for two lettered suffix is sdzz
2447 * which is followed by sdaaa.
2448 *
2449 * This is basically 26 base counting with one extra 'nil' entry
2450 * at the beginning from the second digit on and can be
2451 * determined using similar method as 26 base conversion with the
2452 * index shifted -1 after each digit is computed.
2453 *
2454 * CONTEXT:
2455 * Don't care.
2456 *
2457 * RETURNS:
2458 * 0 on success, -errno on failure.
2459 */
2460static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2461{
2462 const int base = 'z' - 'a' + 1;
2463 char *begin = buf + strlen(prefix);
2464 char *end = buf + buflen;
2465 char *p;
2466 int unit;
2467
2468 p = end - 1;
2469 *p = '\0';
2470 unit = base;
2471 do {
2472 if (p == begin)
2473 return -EINVAL;
2474 *--p = 'a' + (index % unit);
2475 index = (index / unit) - 1;
2476 } while (index >= 0);
2477
2478 memmove(begin, p, end - p);
2479 memcpy(buf, prefix, strlen(prefix));
2480
2481 return 0;
2482}
2483
2484/*
2485 * The asynchronous part of sd_probe
2486 */
2487static void sd_probe_async(void *data, async_cookie_t cookie)
2488{
2489 struct scsi_disk *sdkp = data;
2490 struct scsi_device *sdp;
2491 struct gendisk *gd;
2492 u32 index;
2493 struct device *dev;
2494
2495 sdp = sdkp->device;
2496 gd = sdkp->disk;
2497 index = sdkp->index;
2498 dev = &sdp->sdev_gendev;
2499
2500 gd->major = sd_major((index & 0xf0) >> 4);
2501 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2502 gd->minors = SD_MINORS;
2503
2504 gd->fops = &sd_fops;
2505 gd->private_data = &sdkp->driver;
2506 gd->queue = sdkp->device->request_queue;
2507
2508 /* defaults, until the device tells us otherwise */
2509 sdp->sector_size = 512;
2510 sdkp->capacity = 0;
2511 sdkp->media_present = 1;
2512 sdkp->write_prot = 0;
2513 sdkp->WCE = 0;
2514 sdkp->RCD = 0;
2515 sdkp->ATO = 0;
2516 sdkp->first_scan = 1;
2517
2518 sd_revalidate_disk(gd);
2519
2520 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2521 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2522
2523 gd->driverfs_dev = &sdp->sdev_gendev;
2524 gd->flags = GENHD_FL_EXT_DEVT;
2525 if (sdp->removable) {
2526 gd->flags |= GENHD_FL_REMOVABLE;
2527 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2528 }
2529
2530 add_disk(gd);
2531 sd_dif_config_host(sdkp);
2532
2533 sd_revalidate_disk(gd);
2534
2535 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2536 sdp->removable ? "removable " : "");
2537 scsi_autopm_put_device(sdp);
2538 put_device(&sdkp->dev);
2539}
2540
2541/**
2542 * sd_probe - called during driver initialization and whenever a
2543 * new scsi device is attached to the system. It is called once
2544 * for each scsi device (not just disks) present.
2545 * @dev: pointer to device object
2546 *
2547 * Returns 0 if successful (or not interested in this scsi device
2548 * (e.g. scanner)); 1 when there is an error.
2549 *
2550 * Note: this function is invoked from the scsi mid-level.
2551 * This function sets up the mapping between a given
2552 * <host,channel,id,lun> (found in sdp) and new device name
2553 * (e.g. /dev/sda). More precisely it is the block device major
2554 * and minor number that is chosen here.
2555 *
2556 * Assume sd_attach is not re-entrant (for time being)
2557 * Also think about sd_attach() and sd_remove() running coincidentally.
2558 **/
2559static int sd_probe(struct device *dev)
2560{
2561 struct scsi_device *sdp = to_scsi_device(dev);
2562 struct scsi_disk *sdkp;
2563 struct gendisk *gd;
2564 int index;
2565 int error;
2566
2567 error = -ENODEV;
2568 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2569 goto out;
2570
2571 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2572 "sd_attach\n"));
2573
2574 error = -ENOMEM;
2575 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2576 if (!sdkp)
2577 goto out;
2578
2579 gd = alloc_disk(SD_MINORS);
2580 if (!gd)
2581 goto out_free;
2582
2583 do {
2584 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2585 goto out_put;
2586
2587 spin_lock(&sd_index_lock);
2588 error = ida_get_new(&sd_index_ida, &index);
2589 spin_unlock(&sd_index_lock);
2590 } while (error == -EAGAIN);
2591
2592 if (error)
2593 goto out_put;
2594
2595 if (index >= SD_MAX_DISKS) {
2596 error = -ENODEV;
2597 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name space exhausted.\n");
2598 goto out_free_index;
2599 }
2600
2601 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2602 if (error)
2603 goto out_free_index;
2604
2605 sdkp->device = sdp;
2606 sdkp->driver = &sd_template;
2607 sdkp->disk = gd;
2608 sdkp->index = index;
2609 atomic_set(&sdkp->openers, 0);
2610
2611 if (!sdp->request_queue->rq_timeout) {
2612 if (sdp->type != TYPE_MOD)
2613 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2614 else
2615 blk_queue_rq_timeout(sdp->request_queue,
2616 SD_MOD_TIMEOUT);
2617 }
2618
2619 device_initialize(&sdkp->dev);
2620 sdkp->dev.parent = dev;
2621 sdkp->dev.class = &sd_disk_class;
2622 dev_set_name(&sdkp->dev, dev_name(dev));
2623
2624 if (device_add(&sdkp->dev))
2625 goto out_free_index;
2626
2627 get_device(dev);
2628 dev_set_drvdata(dev, sdkp);
2629
2630 get_device(&sdkp->dev); /* prevent release before async_schedule */
2631 async_schedule(sd_probe_async, sdkp);
2632
2633 return 0;
2634
2635 out_free_index:
2636 spin_lock(&sd_index_lock);
2637 ida_remove(&sd_index_ida, index);
2638 spin_unlock(&sd_index_lock);
2639 out_put:
2640 put_disk(gd);
2641 out_free:
2642 kfree(sdkp);
2643 out:
2644 return error;
2645}
2646
2647/**
2648 * sd_remove - called whenever a scsi disk (previously recognized by
2649 * sd_probe) is detached from the system. It is called (potentially
2650 * multiple times) during sd module unload.
2651 * @sdp: pointer to mid level scsi device object
2652 *
2653 * Note: this function is invoked from the scsi mid-level.
2654 * This function potentially frees up a device name (e.g. /dev/sdc)
2655 * that could be re-used by a subsequent sd_probe().
2656 * This function is not called when the built-in sd driver is "exit-ed".
2657 **/
2658static int sd_remove(struct device *dev)
2659{
2660 struct scsi_disk *sdkp;
2661
2662 sdkp = dev_get_drvdata(dev);
2663 scsi_autopm_get_device(sdkp->device);
2664
2665 async_synchronize_full();
2666 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2667 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
2668 device_del(&sdkp->dev);
2669 del_gendisk(sdkp->disk);
2670 sd_shutdown(dev);
2671
2672 mutex_lock(&sd_ref_mutex);
2673 dev_set_drvdata(dev, NULL);
2674 put_device(&sdkp->dev);
2675 mutex_unlock(&sd_ref_mutex);
2676
2677 return 0;
2678}
2679
2680/**
2681 * scsi_disk_release - Called to free the scsi_disk structure
2682 * @dev: pointer to embedded class device
2683 *
2684 * sd_ref_mutex must be held entering this routine. Because it is
2685 * called on last put, you should always use the scsi_disk_get()
2686 * scsi_disk_put() helpers which manipulate the semaphore directly
2687 * and never do a direct put_device.
2688 **/
2689static void scsi_disk_release(struct device *dev)
2690{
2691 struct scsi_disk *sdkp = to_scsi_disk(dev);
2692 struct gendisk *disk = sdkp->disk;
2693
2694 spin_lock(&sd_index_lock);
2695 ida_remove(&sd_index_ida, sdkp->index);
2696 spin_unlock(&sd_index_lock);
2697
2698 disk->private_data = NULL;
2699 put_disk(disk);
2700 put_device(&sdkp->device->sdev_gendev);
2701
2702 kfree(sdkp);
2703}
2704
2705static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2706{
2707 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2708 struct scsi_sense_hdr sshdr;
2709 struct scsi_device *sdp = sdkp->device;
2710 int res;
2711
2712 if (start)
2713 cmd[4] |= 1; /* START */
2714
2715 if (sdp->start_stop_pwr_cond)
2716 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2717
2718 if (!scsi_device_online(sdp))
2719 return -ENODEV;
2720
2721 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2722 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2723 if (res) {
2724 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2725 sd_print_result(sdkp, res);
2726 if (driver_byte(res) & DRIVER_SENSE)
2727 sd_print_sense_hdr(sdkp, &sshdr);
2728 }
2729
2730 return res;
2731}
2732
2733/*
2734 * Send a SYNCHRONIZE CACHE instruction down to the device through
2735 * the normal SCSI command structure. Wait for the command to
2736 * complete.
2737 */
2738static void sd_shutdown(struct device *dev)
2739{
2740 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2741
2742 if (!sdkp)
2743 return; /* this can happen */
2744
2745 if (sdkp->WCE) {
2746 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2747 sd_sync_cache(sdkp);
2748 }
2749
2750 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2751 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2752 sd_start_stop_device(sdkp, 0);
2753 }
2754
2755 scsi_disk_put(sdkp);
2756}
2757
2758static int sd_suspend(struct device *dev, pm_message_t mesg)
2759{
2760 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2761 int ret = 0;
2762
2763 if (!sdkp)
2764 return 0; /* this can happen */
2765
2766 if (sdkp->WCE) {
2767 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2768 ret = sd_sync_cache(sdkp);
2769 if (ret)
2770 goto done;
2771 }
2772
2773 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2774 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2775 ret = sd_start_stop_device(sdkp, 0);
2776 }
2777
2778done:
2779 scsi_disk_put(sdkp);
2780 return ret;
2781}
2782
2783static int sd_resume(struct device *dev)
2784{
2785 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2786 int ret = 0;
2787
2788 if (!sdkp->device->manage_start_stop)
2789 goto done;
2790
2791 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2792 ret = sd_start_stop_device(sdkp, 1);
2793
2794done:
2795 scsi_disk_put(sdkp);
2796 return ret;
2797}
2798
2799/**
2800 * init_sd - entry point for this driver (both when built in or when
2801 * a module).
2802 *
2803 * Note: this function registers this driver with the scsi mid-level.
2804 **/
2805static int __init init_sd(void)
2806{
2807 int majors = 0, i, err;
2808
2809 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2810
2811 for (i = 0; i < SD_MAJORS; i++)
2812 if (register_blkdev(sd_major(i), "sd") == 0)
2813 majors++;
2814
2815 if (!majors)
2816 return -ENODEV;
2817
2818 err = class_register(&sd_disk_class);
2819 if (err)
2820 goto err_out;
2821
2822 err = scsi_register_driver(&sd_template.gendrv);
2823 if (err)
2824 goto err_out_class;
2825
2826 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2827 0, 0, NULL);
2828 if (!sd_cdb_cache) {
2829 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2830 goto err_out_class;
2831 }
2832
2833 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2834 if (!sd_cdb_pool) {
2835 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2836 goto err_out_cache;
2837 }
2838
2839 return 0;
2840
2841err_out_cache:
2842 kmem_cache_destroy(sd_cdb_cache);
2843
2844err_out_class:
2845 class_unregister(&sd_disk_class);
2846err_out:
2847 for (i = 0; i < SD_MAJORS; i++)
2848 unregister_blkdev(sd_major(i), "sd");
2849 return err;
2850}
2851
2852/**
2853 * exit_sd - exit point for this driver (when it is a module).
2854 *
2855 * Note: this function unregisters this driver from the scsi mid-level.
2856 **/
2857static void __exit exit_sd(void)
2858{
2859 int i;
2860
2861 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2862
2863 mempool_destroy(sd_cdb_pool);
2864 kmem_cache_destroy(sd_cdb_cache);
2865
2866 scsi_unregister_driver(&sd_template.gendrv);
2867 class_unregister(&sd_disk_class);
2868
2869 for (i = 0; i < SD_MAJORS; i++)
2870 unregister_blkdev(sd_major(i), "sd");
2871}
2872
2873module_init(init_sd);
2874module_exit(exit_sd);
2875
2876static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2877 struct scsi_sense_hdr *sshdr)
2878{
2879 sd_printk(KERN_INFO, sdkp, " ");
2880 scsi_show_sense_hdr(sshdr);
2881 sd_printk(KERN_INFO, sdkp, " ");
2882 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2883}
2884
2885static void sd_print_result(struct scsi_disk *sdkp, int result)
2886{
2887 sd_printk(KERN_INFO, sdkp, " ");
2888 scsi_show_result(result);
2889}
2890
1/*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
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.
25 *
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.
33 */
34
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/sed-opal.h>
54#include <linux/pm_runtime.h>
55#include <linux/pr.h>
56#include <linux/t10-pi.h>
57#include <linux/uaccess.h>
58#include <asm/unaligned.h>
59
60#include <scsi/scsi.h>
61#include <scsi/scsi_cmnd.h>
62#include <scsi/scsi_dbg.h>
63#include <scsi/scsi_device.h>
64#include <scsi/scsi_driver.h>
65#include <scsi/scsi_eh.h>
66#include <scsi/scsi_host.h>
67#include <scsi/scsi_ioctl.h>
68#include <scsi/scsicam.h>
69
70#include "sd.h"
71#include "scsi_priv.h"
72#include "scsi_logging.h"
73
74MODULE_AUTHOR("Eric Youngdale");
75MODULE_DESCRIPTION("SCSI disk (sd) driver");
76MODULE_LICENSE("GPL");
77
78MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
79MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
80MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
81MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
82MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
83MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
84MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
85MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
86MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
87MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
88MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
89MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
90MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
91MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
92MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
93MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
94MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
95MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
96MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
97MODULE_ALIAS_SCSI_DEVICE(TYPE_ZBC);
98
99#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
100#define SD_MINORS 16
101#else
102#define SD_MINORS 0
103#endif
104
105static void sd_config_discard(struct scsi_disk *, unsigned int);
106static void sd_config_write_same(struct scsi_disk *);
107static int sd_revalidate_disk(struct gendisk *);
108static void sd_unlock_native_capacity(struct gendisk *disk);
109static int sd_probe(struct device *);
110static int sd_remove(struct device *);
111static void sd_shutdown(struct device *);
112static int sd_suspend_system(struct device *);
113static int sd_suspend_runtime(struct device *);
114static int sd_resume(struct device *);
115static void sd_rescan(struct device *);
116static int sd_init_command(struct scsi_cmnd *SCpnt);
117static void sd_uninit_command(struct scsi_cmnd *SCpnt);
118static int sd_done(struct scsi_cmnd *);
119static void sd_eh_reset(struct scsi_cmnd *);
120static int sd_eh_action(struct scsi_cmnd *, int);
121static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
122static void scsi_disk_release(struct device *cdev);
123static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
124static void sd_print_result(const struct scsi_disk *, const char *, int);
125
126static DEFINE_SPINLOCK(sd_index_lock);
127static DEFINE_IDA(sd_index_ida);
128
129/* This semaphore is used to mediate the 0->1 reference get in the
130 * face of object destruction (i.e. we can't allow a get on an
131 * object after last put) */
132static DEFINE_MUTEX(sd_ref_mutex);
133
134static struct kmem_cache *sd_cdb_cache;
135static mempool_t *sd_cdb_pool;
136
137static const char *sd_cache_types[] = {
138 "write through", "none", "write back",
139 "write back, no read (daft)"
140};
141
142static void sd_set_flush_flag(struct scsi_disk *sdkp)
143{
144 bool wc = false, fua = false;
145
146 if (sdkp->WCE) {
147 wc = true;
148 if (sdkp->DPOFUA)
149 fua = true;
150 }
151
152 blk_queue_write_cache(sdkp->disk->queue, wc, fua);
153}
154
155static ssize_t
156cache_type_store(struct device *dev, struct device_attribute *attr,
157 const char *buf, size_t count)
158{
159 int ct, rcd, wce, sp;
160 struct scsi_disk *sdkp = to_scsi_disk(dev);
161 struct scsi_device *sdp = sdkp->device;
162 char buffer[64];
163 char *buffer_data;
164 struct scsi_mode_data data;
165 struct scsi_sense_hdr sshdr;
166 static const char temp[] = "temporary ";
167 int len;
168
169 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
170 /* no cache control on RBC devices; theoretically they
171 * can do it, but there's probably so many exceptions
172 * it's not worth the risk */
173 return -EINVAL;
174
175 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
176 buf += sizeof(temp) - 1;
177 sdkp->cache_override = 1;
178 } else {
179 sdkp->cache_override = 0;
180 }
181
182 ct = sysfs_match_string(sd_cache_types, buf);
183 if (ct < 0)
184 return -EINVAL;
185
186 rcd = ct & 0x01 ? 1 : 0;
187 wce = (ct & 0x02) && !sdkp->write_prot ? 1 : 0;
188
189 if (sdkp->cache_override) {
190 sdkp->WCE = wce;
191 sdkp->RCD = rcd;
192 sd_set_flush_flag(sdkp);
193 return count;
194 }
195
196 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
197 SD_MAX_RETRIES, &data, NULL))
198 return -EINVAL;
199 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
200 data.block_descriptor_length);
201 buffer_data = buffer + data.header_length +
202 data.block_descriptor_length;
203 buffer_data[2] &= ~0x05;
204 buffer_data[2] |= wce << 2 | rcd;
205 sp = buffer_data[0] & 0x80 ? 1 : 0;
206 buffer_data[0] &= ~0x80;
207
208 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
209 SD_MAX_RETRIES, &data, &sshdr)) {
210 if (scsi_sense_valid(&sshdr))
211 sd_print_sense_hdr(sdkp, &sshdr);
212 return -EINVAL;
213 }
214 revalidate_disk(sdkp->disk);
215 return count;
216}
217
218static ssize_t
219manage_start_stop_show(struct device *dev, struct device_attribute *attr,
220 char *buf)
221{
222 struct scsi_disk *sdkp = to_scsi_disk(dev);
223 struct scsi_device *sdp = sdkp->device;
224
225 return sprintf(buf, "%u\n", sdp->manage_start_stop);
226}
227
228static ssize_t
229manage_start_stop_store(struct device *dev, struct device_attribute *attr,
230 const char *buf, size_t count)
231{
232 struct scsi_disk *sdkp = to_scsi_disk(dev);
233 struct scsi_device *sdp = sdkp->device;
234 bool v;
235
236 if (!capable(CAP_SYS_ADMIN))
237 return -EACCES;
238
239 if (kstrtobool(buf, &v))
240 return -EINVAL;
241
242 sdp->manage_start_stop = v;
243
244 return count;
245}
246static DEVICE_ATTR_RW(manage_start_stop);
247
248static ssize_t
249allow_restart_show(struct device *dev, struct device_attribute *attr, char *buf)
250{
251 struct scsi_disk *sdkp = to_scsi_disk(dev);
252
253 return sprintf(buf, "%u\n", sdkp->device->allow_restart);
254}
255
256static ssize_t
257allow_restart_store(struct device *dev, struct device_attribute *attr,
258 const char *buf, size_t count)
259{
260 bool v;
261 struct scsi_disk *sdkp = to_scsi_disk(dev);
262 struct scsi_device *sdp = sdkp->device;
263
264 if (!capable(CAP_SYS_ADMIN))
265 return -EACCES;
266
267 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
268 return -EINVAL;
269
270 if (kstrtobool(buf, &v))
271 return -EINVAL;
272
273 sdp->allow_restart = v;
274
275 return count;
276}
277static DEVICE_ATTR_RW(allow_restart);
278
279static ssize_t
280cache_type_show(struct device *dev, struct device_attribute *attr, char *buf)
281{
282 struct scsi_disk *sdkp = to_scsi_disk(dev);
283 int ct = sdkp->RCD + 2*sdkp->WCE;
284
285 return sprintf(buf, "%s\n", sd_cache_types[ct]);
286}
287static DEVICE_ATTR_RW(cache_type);
288
289static ssize_t
290FUA_show(struct device *dev, struct device_attribute *attr, char *buf)
291{
292 struct scsi_disk *sdkp = to_scsi_disk(dev);
293
294 return sprintf(buf, "%u\n", sdkp->DPOFUA);
295}
296static DEVICE_ATTR_RO(FUA);
297
298static ssize_t
299protection_type_show(struct device *dev, struct device_attribute *attr,
300 char *buf)
301{
302 struct scsi_disk *sdkp = to_scsi_disk(dev);
303
304 return sprintf(buf, "%u\n", sdkp->protection_type);
305}
306
307static ssize_t
308protection_type_store(struct device *dev, struct device_attribute *attr,
309 const char *buf, size_t count)
310{
311 struct scsi_disk *sdkp = to_scsi_disk(dev);
312 unsigned int val;
313 int err;
314
315 if (!capable(CAP_SYS_ADMIN))
316 return -EACCES;
317
318 err = kstrtouint(buf, 10, &val);
319
320 if (err)
321 return err;
322
323 if (val <= T10_PI_TYPE3_PROTECTION)
324 sdkp->protection_type = val;
325
326 return count;
327}
328static DEVICE_ATTR_RW(protection_type);
329
330static ssize_t
331protection_mode_show(struct device *dev, struct device_attribute *attr,
332 char *buf)
333{
334 struct scsi_disk *sdkp = to_scsi_disk(dev);
335 struct scsi_device *sdp = sdkp->device;
336 unsigned int dif, dix;
337
338 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
339 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
340
341 if (!dix && scsi_host_dix_capable(sdp->host, T10_PI_TYPE0_PROTECTION)) {
342 dif = 0;
343 dix = 1;
344 }
345
346 if (!dif && !dix)
347 return sprintf(buf, "none\n");
348
349 return sprintf(buf, "%s%u\n", dix ? "dix" : "dif", dif);
350}
351static DEVICE_ATTR_RO(protection_mode);
352
353static ssize_t
354app_tag_own_show(struct device *dev, struct device_attribute *attr, char *buf)
355{
356 struct scsi_disk *sdkp = to_scsi_disk(dev);
357
358 return sprintf(buf, "%u\n", sdkp->ATO);
359}
360static DEVICE_ATTR_RO(app_tag_own);
361
362static ssize_t
363thin_provisioning_show(struct device *dev, struct device_attribute *attr,
364 char *buf)
365{
366 struct scsi_disk *sdkp = to_scsi_disk(dev);
367
368 return sprintf(buf, "%u\n", sdkp->lbpme);
369}
370static DEVICE_ATTR_RO(thin_provisioning);
371
372/* sysfs_match_string() requires dense arrays */
373static const char *lbp_mode[] = {
374 [SD_LBP_FULL] = "full",
375 [SD_LBP_UNMAP] = "unmap",
376 [SD_LBP_WS16] = "writesame_16",
377 [SD_LBP_WS10] = "writesame_10",
378 [SD_LBP_ZERO] = "writesame_zero",
379 [SD_LBP_DISABLE] = "disabled",
380};
381
382static ssize_t
383provisioning_mode_show(struct device *dev, struct device_attribute *attr,
384 char *buf)
385{
386 struct scsi_disk *sdkp = to_scsi_disk(dev);
387
388 return sprintf(buf, "%s\n", lbp_mode[sdkp->provisioning_mode]);
389}
390
391static ssize_t
392provisioning_mode_store(struct device *dev, struct device_attribute *attr,
393 const char *buf, size_t count)
394{
395 struct scsi_disk *sdkp = to_scsi_disk(dev);
396 struct scsi_device *sdp = sdkp->device;
397 int mode;
398
399 if (!capable(CAP_SYS_ADMIN))
400 return -EACCES;
401
402 if (sd_is_zoned(sdkp)) {
403 sd_config_discard(sdkp, SD_LBP_DISABLE);
404 return count;
405 }
406
407 if (sdp->type != TYPE_DISK)
408 return -EINVAL;
409
410 mode = sysfs_match_string(lbp_mode, buf);
411 if (mode < 0)
412 return -EINVAL;
413
414 sd_config_discard(sdkp, mode);
415
416 return count;
417}
418static DEVICE_ATTR_RW(provisioning_mode);
419
420/* sysfs_match_string() requires dense arrays */
421static const char *zeroing_mode[] = {
422 [SD_ZERO_WRITE] = "write",
423 [SD_ZERO_WS] = "writesame",
424 [SD_ZERO_WS16_UNMAP] = "writesame_16_unmap",
425 [SD_ZERO_WS10_UNMAP] = "writesame_10_unmap",
426};
427
428static ssize_t
429zeroing_mode_show(struct device *dev, struct device_attribute *attr,
430 char *buf)
431{
432 struct scsi_disk *sdkp = to_scsi_disk(dev);
433
434 return sprintf(buf, "%s\n", zeroing_mode[sdkp->zeroing_mode]);
435}
436
437static ssize_t
438zeroing_mode_store(struct device *dev, struct device_attribute *attr,
439 const char *buf, size_t count)
440{
441 struct scsi_disk *sdkp = to_scsi_disk(dev);
442 int mode;
443
444 if (!capable(CAP_SYS_ADMIN))
445 return -EACCES;
446
447 mode = sysfs_match_string(zeroing_mode, buf);
448 if (mode < 0)
449 return -EINVAL;
450
451 sdkp->zeroing_mode = mode;
452
453 return count;
454}
455static DEVICE_ATTR_RW(zeroing_mode);
456
457static ssize_t
458max_medium_access_timeouts_show(struct device *dev,
459 struct device_attribute *attr, char *buf)
460{
461 struct scsi_disk *sdkp = to_scsi_disk(dev);
462
463 return sprintf(buf, "%u\n", sdkp->max_medium_access_timeouts);
464}
465
466static ssize_t
467max_medium_access_timeouts_store(struct device *dev,
468 struct device_attribute *attr, const char *buf,
469 size_t count)
470{
471 struct scsi_disk *sdkp = to_scsi_disk(dev);
472 int err;
473
474 if (!capable(CAP_SYS_ADMIN))
475 return -EACCES;
476
477 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
478
479 return err ? err : count;
480}
481static DEVICE_ATTR_RW(max_medium_access_timeouts);
482
483static ssize_t
484max_write_same_blocks_show(struct device *dev, struct device_attribute *attr,
485 char *buf)
486{
487 struct scsi_disk *sdkp = to_scsi_disk(dev);
488
489 return sprintf(buf, "%u\n", sdkp->max_ws_blocks);
490}
491
492static ssize_t
493max_write_same_blocks_store(struct device *dev, struct device_attribute *attr,
494 const char *buf, size_t count)
495{
496 struct scsi_disk *sdkp = to_scsi_disk(dev);
497 struct scsi_device *sdp = sdkp->device;
498 unsigned long max;
499 int err;
500
501 if (!capable(CAP_SYS_ADMIN))
502 return -EACCES;
503
504 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
505 return -EINVAL;
506
507 err = kstrtoul(buf, 10, &max);
508
509 if (err)
510 return err;
511
512 if (max == 0)
513 sdp->no_write_same = 1;
514 else if (max <= SD_MAX_WS16_BLOCKS) {
515 sdp->no_write_same = 0;
516 sdkp->max_ws_blocks = max;
517 }
518
519 sd_config_write_same(sdkp);
520
521 return count;
522}
523static DEVICE_ATTR_RW(max_write_same_blocks);
524
525static struct attribute *sd_disk_attrs[] = {
526 &dev_attr_cache_type.attr,
527 &dev_attr_FUA.attr,
528 &dev_attr_allow_restart.attr,
529 &dev_attr_manage_start_stop.attr,
530 &dev_attr_protection_type.attr,
531 &dev_attr_protection_mode.attr,
532 &dev_attr_app_tag_own.attr,
533 &dev_attr_thin_provisioning.attr,
534 &dev_attr_provisioning_mode.attr,
535 &dev_attr_zeroing_mode.attr,
536 &dev_attr_max_write_same_blocks.attr,
537 &dev_attr_max_medium_access_timeouts.attr,
538 NULL,
539};
540ATTRIBUTE_GROUPS(sd_disk);
541
542static struct class sd_disk_class = {
543 .name = "scsi_disk",
544 .owner = THIS_MODULE,
545 .dev_release = scsi_disk_release,
546 .dev_groups = sd_disk_groups,
547};
548
549static const struct dev_pm_ops sd_pm_ops = {
550 .suspend = sd_suspend_system,
551 .resume = sd_resume,
552 .poweroff = sd_suspend_system,
553 .restore = sd_resume,
554 .runtime_suspend = sd_suspend_runtime,
555 .runtime_resume = sd_resume,
556};
557
558static struct scsi_driver sd_template = {
559 .gendrv = {
560 .name = "sd",
561 .owner = THIS_MODULE,
562 .probe = sd_probe,
563 .remove = sd_remove,
564 .shutdown = sd_shutdown,
565 .pm = &sd_pm_ops,
566 },
567 .rescan = sd_rescan,
568 .init_command = sd_init_command,
569 .uninit_command = sd_uninit_command,
570 .done = sd_done,
571 .eh_action = sd_eh_action,
572 .eh_reset = sd_eh_reset,
573};
574
575/*
576 * Dummy kobj_map->probe function.
577 * The default ->probe function will call modprobe, which is
578 * pointless as this module is already loaded.
579 */
580static struct kobject *sd_default_probe(dev_t devt, int *partno, void *data)
581{
582 return NULL;
583}
584
585/*
586 * Device no to disk mapping:
587 *
588 * major disc2 disc p1
589 * |............|.............|....|....| <- dev_t
590 * 31 20 19 8 7 4 3 0
591 *
592 * Inside a major, we have 16k disks, however mapped non-
593 * contiguously. The first 16 disks are for major0, the next
594 * ones with major1, ... Disk 256 is for major0 again, disk 272
595 * for major1, ...
596 * As we stay compatible with our numbering scheme, we can reuse
597 * the well-know SCSI majors 8, 65--71, 136--143.
598 */
599static int sd_major(int major_idx)
600{
601 switch (major_idx) {
602 case 0:
603 return SCSI_DISK0_MAJOR;
604 case 1 ... 7:
605 return SCSI_DISK1_MAJOR + major_idx - 1;
606 case 8 ... 15:
607 return SCSI_DISK8_MAJOR + major_idx - 8;
608 default:
609 BUG();
610 return 0; /* shut up gcc */
611 }
612}
613
614static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
615{
616 struct scsi_disk *sdkp = NULL;
617
618 mutex_lock(&sd_ref_mutex);
619
620 if (disk->private_data) {
621 sdkp = scsi_disk(disk);
622 if (scsi_device_get(sdkp->device) == 0)
623 get_device(&sdkp->dev);
624 else
625 sdkp = NULL;
626 }
627 mutex_unlock(&sd_ref_mutex);
628 return sdkp;
629}
630
631static void scsi_disk_put(struct scsi_disk *sdkp)
632{
633 struct scsi_device *sdev = sdkp->device;
634
635 mutex_lock(&sd_ref_mutex);
636 put_device(&sdkp->dev);
637 scsi_device_put(sdev);
638 mutex_unlock(&sd_ref_mutex);
639}
640
641#ifdef CONFIG_BLK_SED_OPAL
642static int sd_sec_submit(void *data, u16 spsp, u8 secp, void *buffer,
643 size_t len, bool send)
644{
645 struct scsi_device *sdev = data;
646 u8 cdb[12] = { 0, };
647 int ret;
648
649 cdb[0] = send ? SECURITY_PROTOCOL_OUT : SECURITY_PROTOCOL_IN;
650 cdb[1] = secp;
651 put_unaligned_be16(spsp, &cdb[2]);
652 put_unaligned_be32(len, &cdb[6]);
653
654 ret = scsi_execute_req(sdev, cdb,
655 send ? DMA_TO_DEVICE : DMA_FROM_DEVICE,
656 buffer, len, NULL, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
657 return ret <= 0 ? ret : -EIO;
658}
659#endif /* CONFIG_BLK_SED_OPAL */
660
661static unsigned char sd_setup_protect_cmnd(struct scsi_cmnd *scmd,
662 unsigned int dix, unsigned int dif)
663{
664 struct bio *bio = scmd->request->bio;
665 unsigned int prot_op = sd_prot_op(rq_data_dir(scmd->request), dix, dif);
666 unsigned int protect = 0;
667
668 if (dix) { /* DIX Type 0, 1, 2, 3 */
669 if (bio_integrity_flagged(bio, BIP_IP_CHECKSUM))
670 scmd->prot_flags |= SCSI_PROT_IP_CHECKSUM;
671
672 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
673 scmd->prot_flags |= SCSI_PROT_GUARD_CHECK;
674 }
675
676 if (dif != T10_PI_TYPE3_PROTECTION) { /* DIX/DIF Type 0, 1, 2 */
677 scmd->prot_flags |= SCSI_PROT_REF_INCREMENT;
678
679 if (bio_integrity_flagged(bio, BIP_CTRL_NOCHECK) == false)
680 scmd->prot_flags |= SCSI_PROT_REF_CHECK;
681 }
682
683 if (dif) { /* DIX/DIF Type 1, 2, 3 */
684 scmd->prot_flags |= SCSI_PROT_TRANSFER_PI;
685
686 if (bio_integrity_flagged(bio, BIP_DISK_NOCHECK))
687 protect = 3 << 5; /* Disable target PI checking */
688 else
689 protect = 1 << 5; /* Enable target PI checking */
690 }
691
692 scsi_set_prot_op(scmd, prot_op);
693 scsi_set_prot_type(scmd, dif);
694 scmd->prot_flags &= sd_prot_flag_mask(prot_op);
695
696 return protect;
697}
698
699static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
700{
701 struct request_queue *q = sdkp->disk->queue;
702 unsigned int logical_block_size = sdkp->device->sector_size;
703 unsigned int max_blocks = 0;
704
705 q->limits.discard_alignment =
706 sdkp->unmap_alignment * logical_block_size;
707 q->limits.discard_granularity =
708 max(sdkp->physical_block_size,
709 sdkp->unmap_granularity * logical_block_size);
710 sdkp->provisioning_mode = mode;
711
712 switch (mode) {
713
714 case SD_LBP_FULL:
715 case SD_LBP_DISABLE:
716 blk_queue_max_discard_sectors(q, 0);
717 blk_queue_flag_clear(QUEUE_FLAG_DISCARD, q);
718 return;
719
720 case SD_LBP_UNMAP:
721 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
722 (u32)SD_MAX_WS16_BLOCKS);
723 break;
724
725 case SD_LBP_WS16:
726 if (sdkp->device->unmap_limit_for_ws)
727 max_blocks = sdkp->max_unmap_blocks;
728 else
729 max_blocks = sdkp->max_ws_blocks;
730
731 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS16_BLOCKS);
732 break;
733
734 case SD_LBP_WS10:
735 if (sdkp->device->unmap_limit_for_ws)
736 max_blocks = sdkp->max_unmap_blocks;
737 else
738 max_blocks = sdkp->max_ws_blocks;
739
740 max_blocks = min_not_zero(max_blocks, (u32)SD_MAX_WS10_BLOCKS);
741 break;
742
743 case SD_LBP_ZERO:
744 max_blocks = min_not_zero(sdkp->max_ws_blocks,
745 (u32)SD_MAX_WS10_BLOCKS);
746 break;
747 }
748
749 blk_queue_max_discard_sectors(q, max_blocks * (logical_block_size >> 9));
750 blk_queue_flag_set(QUEUE_FLAG_DISCARD, q);
751}
752
753static int sd_setup_unmap_cmnd(struct scsi_cmnd *cmd)
754{
755 struct scsi_device *sdp = cmd->device;
756 struct request *rq = cmd->request;
757 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
758 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
759 unsigned int data_len = 24;
760 char *buf;
761
762 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
763 if (!rq->special_vec.bv_page)
764 return BLKPREP_DEFER;
765 rq->special_vec.bv_offset = 0;
766 rq->special_vec.bv_len = data_len;
767 rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
768
769 cmd->cmd_len = 10;
770 cmd->cmnd[0] = UNMAP;
771 cmd->cmnd[8] = 24;
772
773 buf = page_address(rq->special_vec.bv_page);
774 put_unaligned_be16(6 + 16, &buf[0]);
775 put_unaligned_be16(16, &buf[2]);
776 put_unaligned_be64(sector, &buf[8]);
777 put_unaligned_be32(nr_sectors, &buf[16]);
778
779 cmd->allowed = SD_MAX_RETRIES;
780 cmd->transfersize = data_len;
781 rq->timeout = SD_TIMEOUT;
782 scsi_req(rq)->resid_len = data_len;
783
784 return scsi_init_io(cmd);
785}
786
787static int sd_setup_write_same16_cmnd(struct scsi_cmnd *cmd, bool unmap)
788{
789 struct scsi_device *sdp = cmd->device;
790 struct request *rq = cmd->request;
791 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
792 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
793 u32 data_len = sdp->sector_size;
794
795 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
796 if (!rq->special_vec.bv_page)
797 return BLKPREP_DEFER;
798 rq->special_vec.bv_offset = 0;
799 rq->special_vec.bv_len = data_len;
800 rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
801
802 cmd->cmd_len = 16;
803 cmd->cmnd[0] = WRITE_SAME_16;
804 if (unmap)
805 cmd->cmnd[1] = 0x8; /* UNMAP */
806 put_unaligned_be64(sector, &cmd->cmnd[2]);
807 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
808
809 cmd->allowed = SD_MAX_RETRIES;
810 cmd->transfersize = data_len;
811 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
812 scsi_req(rq)->resid_len = data_len;
813
814 return scsi_init_io(cmd);
815}
816
817static int sd_setup_write_same10_cmnd(struct scsi_cmnd *cmd, bool unmap)
818{
819 struct scsi_device *sdp = cmd->device;
820 struct request *rq = cmd->request;
821 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
822 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
823 u32 data_len = sdp->sector_size;
824
825 rq->special_vec.bv_page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
826 if (!rq->special_vec.bv_page)
827 return BLKPREP_DEFER;
828 rq->special_vec.bv_offset = 0;
829 rq->special_vec.bv_len = data_len;
830 rq->rq_flags |= RQF_SPECIAL_PAYLOAD;
831
832 cmd->cmd_len = 10;
833 cmd->cmnd[0] = WRITE_SAME;
834 if (unmap)
835 cmd->cmnd[1] = 0x8; /* UNMAP */
836 put_unaligned_be32(sector, &cmd->cmnd[2]);
837 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
838
839 cmd->allowed = SD_MAX_RETRIES;
840 cmd->transfersize = data_len;
841 rq->timeout = unmap ? SD_TIMEOUT : SD_WRITE_SAME_TIMEOUT;
842 scsi_req(rq)->resid_len = data_len;
843
844 return scsi_init_io(cmd);
845}
846
847static int sd_setup_write_zeroes_cmnd(struct scsi_cmnd *cmd)
848{
849 struct request *rq = cmd->request;
850 struct scsi_device *sdp = cmd->device;
851 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
852 u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
853 u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
854
855 if (!(rq->cmd_flags & REQ_NOUNMAP)) {
856 switch (sdkp->zeroing_mode) {
857 case SD_ZERO_WS16_UNMAP:
858 return sd_setup_write_same16_cmnd(cmd, true);
859 case SD_ZERO_WS10_UNMAP:
860 return sd_setup_write_same10_cmnd(cmd, true);
861 }
862 }
863
864 if (sdp->no_write_same)
865 return BLKPREP_INVALID;
866
867 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff)
868 return sd_setup_write_same16_cmnd(cmd, false);
869
870 return sd_setup_write_same10_cmnd(cmd, false);
871}
872
873static void sd_config_write_same(struct scsi_disk *sdkp)
874{
875 struct request_queue *q = sdkp->disk->queue;
876 unsigned int logical_block_size = sdkp->device->sector_size;
877
878 if (sdkp->device->no_write_same) {
879 sdkp->max_ws_blocks = 0;
880 goto out;
881 }
882
883 /* Some devices can not handle block counts above 0xffff despite
884 * supporting WRITE SAME(16). Consequently we default to 64k
885 * blocks per I/O unless the device explicitly advertises a
886 * bigger limit.
887 */
888 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
889 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
890 (u32)SD_MAX_WS16_BLOCKS);
891 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
892 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
893 (u32)SD_MAX_WS10_BLOCKS);
894 else {
895 sdkp->device->no_write_same = 1;
896 sdkp->max_ws_blocks = 0;
897 }
898
899 if (sdkp->lbprz && sdkp->lbpws)
900 sdkp->zeroing_mode = SD_ZERO_WS16_UNMAP;
901 else if (sdkp->lbprz && sdkp->lbpws10)
902 sdkp->zeroing_mode = SD_ZERO_WS10_UNMAP;
903 else if (sdkp->max_ws_blocks)
904 sdkp->zeroing_mode = SD_ZERO_WS;
905 else
906 sdkp->zeroing_mode = SD_ZERO_WRITE;
907
908 if (sdkp->max_ws_blocks &&
909 sdkp->physical_block_size > logical_block_size) {
910 /*
911 * Reporting a maximum number of blocks that is not aligned
912 * on the device physical size would cause a large write same
913 * request to be split into physically unaligned chunks by
914 * __blkdev_issue_write_zeroes() and __blkdev_issue_write_same()
915 * even if the caller of these functions took care to align the
916 * large request. So make sure the maximum reported is aligned
917 * to the device physical block size. This is only an optional
918 * optimization for regular disks, but this is mandatory to
919 * avoid failure of large write same requests directed at
920 * sequential write required zones of host-managed ZBC disks.
921 */
922 sdkp->max_ws_blocks =
923 round_down(sdkp->max_ws_blocks,
924 bytes_to_logical(sdkp->device,
925 sdkp->physical_block_size));
926 }
927
928out:
929 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
930 (logical_block_size >> 9));
931 blk_queue_max_write_zeroes_sectors(q, sdkp->max_ws_blocks *
932 (logical_block_size >> 9));
933}
934
935/**
936 * sd_setup_write_same_cmnd - write the same data to multiple blocks
937 * @cmd: command to prepare
938 *
939 * Will set up either WRITE SAME(10) or WRITE SAME(16) depending on
940 * the preference indicated by the target device.
941 **/
942static int sd_setup_write_same_cmnd(struct scsi_cmnd *cmd)
943{
944 struct request *rq = cmd->request;
945 struct scsi_device *sdp = cmd->device;
946 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
947 struct bio *bio = rq->bio;
948 sector_t sector = blk_rq_pos(rq);
949 unsigned int nr_sectors = blk_rq_sectors(rq);
950 unsigned int nr_bytes = blk_rq_bytes(rq);
951 int ret;
952
953 if (sdkp->device->no_write_same)
954 return BLKPREP_INVALID;
955
956 BUG_ON(bio_offset(bio) || bio_iovec(bio).bv_len != sdp->sector_size);
957
958 sector >>= ilog2(sdp->sector_size) - 9;
959 nr_sectors >>= ilog2(sdp->sector_size) - 9;
960
961 rq->timeout = SD_WRITE_SAME_TIMEOUT;
962
963 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
964 cmd->cmd_len = 16;
965 cmd->cmnd[0] = WRITE_SAME_16;
966 put_unaligned_be64(sector, &cmd->cmnd[2]);
967 put_unaligned_be32(nr_sectors, &cmd->cmnd[10]);
968 } else {
969 cmd->cmd_len = 10;
970 cmd->cmnd[0] = WRITE_SAME;
971 put_unaligned_be32(sector, &cmd->cmnd[2]);
972 put_unaligned_be16(nr_sectors, &cmd->cmnd[7]);
973 }
974
975 cmd->transfersize = sdp->sector_size;
976 cmd->allowed = SD_MAX_RETRIES;
977
978 /*
979 * For WRITE SAME the data transferred via the DATA OUT buffer is
980 * different from the amount of data actually written to the target.
981 *
982 * We set up __data_len to the amount of data transferred via the
983 * DATA OUT buffer so that blk_rq_map_sg sets up the proper S/G list
984 * to transfer a single sector of data first, but then reset it to
985 * the amount of data to be written right after so that the I/O path
986 * knows how much to actually write.
987 */
988 rq->__data_len = sdp->sector_size;
989 ret = scsi_init_io(cmd);
990 rq->__data_len = nr_bytes;
991
992 return ret;
993}
994
995static int sd_setup_flush_cmnd(struct scsi_cmnd *cmd)
996{
997 struct request *rq = cmd->request;
998
999 /* flush requests don't perform I/O, zero the S/G table */
1000 memset(&cmd->sdb, 0, sizeof(cmd->sdb));
1001
1002 cmd->cmnd[0] = SYNCHRONIZE_CACHE;
1003 cmd->cmd_len = 10;
1004 cmd->transfersize = 0;
1005 cmd->allowed = SD_MAX_RETRIES;
1006
1007 rq->timeout = rq->q->rq_timeout * SD_FLUSH_TIMEOUT_MULTIPLIER;
1008 return BLKPREP_OK;
1009}
1010
1011static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
1012{
1013 struct request *rq = SCpnt->request;
1014 struct scsi_device *sdp = SCpnt->device;
1015 struct gendisk *disk = rq->rq_disk;
1016 struct scsi_disk *sdkp = scsi_disk(disk);
1017 sector_t block = blk_rq_pos(rq);
1018 sector_t threshold;
1019 unsigned int this_count = blk_rq_sectors(rq);
1020 unsigned int dif, dix;
1021 int ret;
1022 unsigned char protect;
1023
1024 ret = scsi_init_io(SCpnt);
1025 if (ret != BLKPREP_OK)
1026 return ret;
1027 WARN_ON_ONCE(SCpnt != rq->special);
1028
1029 /* from here on until we're complete, any goto out
1030 * is used for a killable error condition */
1031 ret = BLKPREP_KILL;
1032
1033 SCSI_LOG_HLQUEUE(1,
1034 scmd_printk(KERN_INFO, SCpnt,
1035 "%s: block=%llu, count=%d\n",
1036 __func__, (unsigned long long)block, this_count));
1037
1038 if (!sdp || !scsi_device_online(sdp) ||
1039 block + blk_rq_sectors(rq) > get_capacity(disk)) {
1040 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1041 "Finishing %u sectors\n",
1042 blk_rq_sectors(rq)));
1043 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1044 "Retry with 0x%p\n", SCpnt));
1045 goto out;
1046 }
1047
1048 if (sdp->changed) {
1049 /*
1050 * quietly refuse to do anything to a changed disc until
1051 * the changed bit has been reset
1052 */
1053 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
1054 goto out;
1055 }
1056
1057 /*
1058 * Some SD card readers can't handle multi-sector accesses which touch
1059 * the last one or two hardware sectors. Split accesses as needed.
1060 */
1061 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
1062 (sdp->sector_size / 512);
1063
1064 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
1065 if (block < threshold) {
1066 /* Access up to the threshold but not beyond */
1067 this_count = threshold - block;
1068 } else {
1069 /* Access only a single hardware sector */
1070 this_count = sdp->sector_size / 512;
1071 }
1072 }
1073
1074 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
1075 (unsigned long long)block));
1076
1077 /*
1078 * If we have a 1K hardware sectorsize, prevent access to single
1079 * 512 byte sectors. In theory we could handle this - in fact
1080 * the scsi cdrom driver must be able to handle this because
1081 * we typically use 1K blocksizes, and cdroms typically have
1082 * 2K hardware sectorsizes. Of course, things are simpler
1083 * with the cdrom, since it is read-only. For performance
1084 * reasons, the filesystems should be able to handle this
1085 * and not force the scsi disk driver to use bounce buffers
1086 * for this.
1087 */
1088 if (sdp->sector_size == 1024) {
1089 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
1090 scmd_printk(KERN_ERR, SCpnt,
1091 "Bad block number requested\n");
1092 goto out;
1093 } else {
1094 block = block >> 1;
1095 this_count = this_count >> 1;
1096 }
1097 }
1098 if (sdp->sector_size == 2048) {
1099 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
1100 scmd_printk(KERN_ERR, SCpnt,
1101 "Bad block number requested\n");
1102 goto out;
1103 } else {
1104 block = block >> 2;
1105 this_count = this_count >> 2;
1106 }
1107 }
1108 if (sdp->sector_size == 4096) {
1109 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
1110 scmd_printk(KERN_ERR, SCpnt,
1111 "Bad block number requested\n");
1112 goto out;
1113 } else {
1114 block = block >> 3;
1115 this_count = this_count >> 3;
1116 }
1117 }
1118 if (rq_data_dir(rq) == WRITE) {
1119 SCpnt->cmnd[0] = WRITE_6;
1120
1121 if (blk_integrity_rq(rq))
1122 sd_dif_prepare(SCpnt);
1123
1124 } else if (rq_data_dir(rq) == READ) {
1125 SCpnt->cmnd[0] = READ_6;
1126 } else {
1127 scmd_printk(KERN_ERR, SCpnt, "Unknown command %d\n", req_op(rq));
1128 goto out;
1129 }
1130
1131 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
1132 "%s %d/%u 512 byte blocks.\n",
1133 (rq_data_dir(rq) == WRITE) ?
1134 "writing" : "reading", this_count,
1135 blk_rq_sectors(rq)));
1136
1137 dix = scsi_prot_sg_count(SCpnt);
1138 dif = scsi_host_dif_capable(SCpnt->device->host, sdkp->protection_type);
1139
1140 if (dif || dix)
1141 protect = sd_setup_protect_cmnd(SCpnt, dix, dif);
1142 else
1143 protect = 0;
1144
1145 if (protect && sdkp->protection_type == T10_PI_TYPE2_PROTECTION) {
1146 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1147
1148 if (unlikely(SCpnt->cmnd == NULL)) {
1149 ret = BLKPREP_DEFER;
1150 goto out;
1151 }
1152
1153 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1154 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1155 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1156 SCpnt->cmnd[7] = 0x18;
1157 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1158 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1159
1160 /* LBA */
1161 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1162 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1163 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1164 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1165 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1166 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1167 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1168 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1169
1170 /* Expected Indirect LBA */
1171 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1172 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1173 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1174 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1175
1176 /* Transfer length */
1177 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1178 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1179 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1180 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1181 } else if (sdp->use_16_for_rw || (this_count > 0xffff)) {
1182 SCpnt->cmnd[0] += READ_16 - READ_6;
1183 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1184 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1185 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1186 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1187 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1188 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1189 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1190 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1191 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1192 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1193 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1194 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1195 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1196 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1197 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1198 scsi_device_protection(SCpnt->device) ||
1199 SCpnt->device->use_10_for_rw) {
1200 SCpnt->cmnd[0] += READ_10 - READ_6;
1201 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1202 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1203 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1204 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1205 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1206 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1207 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1208 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1209 } else {
1210 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1211 /*
1212 * This happens only if this drive failed
1213 * 10byte rw command with ILLEGAL_REQUEST
1214 * during operation and thus turned off
1215 * use_10_for_rw.
1216 */
1217 scmd_printk(KERN_ERR, SCpnt,
1218 "FUA write on READ/WRITE(6) drive\n");
1219 goto out;
1220 }
1221
1222 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1223 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1224 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1225 SCpnt->cmnd[4] = (unsigned char) this_count;
1226 SCpnt->cmnd[5] = 0;
1227 }
1228 SCpnt->sdb.length = this_count * sdp->sector_size;
1229
1230 /*
1231 * We shouldn't disconnect in the middle of a sector, so with a dumb
1232 * host adapter, it's safe to assume that we can at least transfer
1233 * this many bytes between each connect / disconnect.
1234 */
1235 SCpnt->transfersize = sdp->sector_size;
1236 SCpnt->underflow = this_count << 9;
1237 SCpnt->allowed = SD_MAX_RETRIES;
1238
1239 /*
1240 * This indicates that the command is ready from our end to be
1241 * queued.
1242 */
1243 ret = BLKPREP_OK;
1244 out:
1245 return ret;
1246}
1247
1248static int sd_init_command(struct scsi_cmnd *cmd)
1249{
1250 struct request *rq = cmd->request;
1251
1252 switch (req_op(rq)) {
1253 case REQ_OP_DISCARD:
1254 switch (scsi_disk(rq->rq_disk)->provisioning_mode) {
1255 case SD_LBP_UNMAP:
1256 return sd_setup_unmap_cmnd(cmd);
1257 case SD_LBP_WS16:
1258 return sd_setup_write_same16_cmnd(cmd, true);
1259 case SD_LBP_WS10:
1260 return sd_setup_write_same10_cmnd(cmd, true);
1261 case SD_LBP_ZERO:
1262 return sd_setup_write_same10_cmnd(cmd, false);
1263 default:
1264 return BLKPREP_INVALID;
1265 }
1266 case REQ_OP_WRITE_ZEROES:
1267 return sd_setup_write_zeroes_cmnd(cmd);
1268 case REQ_OP_WRITE_SAME:
1269 return sd_setup_write_same_cmnd(cmd);
1270 case REQ_OP_FLUSH:
1271 return sd_setup_flush_cmnd(cmd);
1272 case REQ_OP_READ:
1273 case REQ_OP_WRITE:
1274 return sd_setup_read_write_cmnd(cmd);
1275 case REQ_OP_ZONE_REPORT:
1276 return sd_zbc_setup_report_cmnd(cmd);
1277 case REQ_OP_ZONE_RESET:
1278 return sd_zbc_setup_reset_cmnd(cmd);
1279 default:
1280 BUG();
1281 }
1282}
1283
1284static void sd_uninit_command(struct scsi_cmnd *SCpnt)
1285{
1286 struct request *rq = SCpnt->request;
1287 u8 *cmnd;
1288
1289 if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
1290 __free_page(rq->special_vec.bv_page);
1291
1292 if (SCpnt->cmnd != scsi_req(rq)->cmd) {
1293 cmnd = SCpnt->cmnd;
1294 SCpnt->cmnd = NULL;
1295 SCpnt->cmd_len = 0;
1296 mempool_free(cmnd, sd_cdb_pool);
1297 }
1298}
1299
1300/**
1301 * sd_open - open a scsi disk device
1302 * @bdev: Block device of the scsi disk to open
1303 * @mode: FMODE_* mask
1304 *
1305 * Returns 0 if successful. Returns a negated errno value in case
1306 * of error.
1307 *
1308 * Note: This can be called from a user context (e.g. fsck(1) )
1309 * or from within the kernel (e.g. as a result of a mount(1) ).
1310 * In the latter case @inode and @filp carry an abridged amount
1311 * of information as noted above.
1312 *
1313 * Locking: called with bdev->bd_mutex held.
1314 **/
1315static int sd_open(struct block_device *bdev, fmode_t mode)
1316{
1317 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1318 struct scsi_device *sdev;
1319 int retval;
1320
1321 if (!sdkp)
1322 return -ENXIO;
1323
1324 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1325
1326 sdev = sdkp->device;
1327
1328 /*
1329 * If the device is in error recovery, wait until it is done.
1330 * If the device is offline, then disallow any access to it.
1331 */
1332 retval = -ENXIO;
1333 if (!scsi_block_when_processing_errors(sdev))
1334 goto error_out;
1335
1336 if (sdev->removable || sdkp->write_prot)
1337 check_disk_change(bdev);
1338
1339 /*
1340 * If the drive is empty, just let the open fail.
1341 */
1342 retval = -ENOMEDIUM;
1343 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1344 goto error_out;
1345
1346 /*
1347 * If the device has the write protect tab set, have the open fail
1348 * if the user expects to be able to write to the thing.
1349 */
1350 retval = -EROFS;
1351 if (sdkp->write_prot && (mode & FMODE_WRITE))
1352 goto error_out;
1353
1354 /*
1355 * It is possible that the disk changing stuff resulted in
1356 * the device being taken offline. If this is the case,
1357 * report this to the user, and don't pretend that the
1358 * open actually succeeded.
1359 */
1360 retval = -ENXIO;
1361 if (!scsi_device_online(sdev))
1362 goto error_out;
1363
1364 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1365 if (scsi_block_when_processing_errors(sdev))
1366 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1367 }
1368
1369 return 0;
1370
1371error_out:
1372 scsi_disk_put(sdkp);
1373 return retval;
1374}
1375
1376/**
1377 * sd_release - invoked when the (last) close(2) is called on this
1378 * scsi disk.
1379 * @disk: disk to release
1380 * @mode: FMODE_* mask
1381 *
1382 * Returns 0.
1383 *
1384 * Note: may block (uninterruptible) if error recovery is underway
1385 * on this disk.
1386 *
1387 * Locking: called with bdev->bd_mutex held.
1388 **/
1389static void sd_release(struct gendisk *disk, fmode_t mode)
1390{
1391 struct scsi_disk *sdkp = scsi_disk(disk);
1392 struct scsi_device *sdev = sdkp->device;
1393
1394 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1395
1396 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1397 if (scsi_block_when_processing_errors(sdev))
1398 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1399 }
1400
1401 /*
1402 * XXX and what if there are packets in flight and this close()
1403 * XXX is followed by a "rmmod sd_mod"?
1404 */
1405
1406 scsi_disk_put(sdkp);
1407}
1408
1409static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1410{
1411 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1412 struct scsi_device *sdp = sdkp->device;
1413 struct Scsi_Host *host = sdp->host;
1414 sector_t capacity = logical_to_sectors(sdp, sdkp->capacity);
1415 int diskinfo[4];
1416
1417 /* default to most commonly used values */
1418 diskinfo[0] = 0x40; /* 1 << 6 */
1419 diskinfo[1] = 0x20; /* 1 << 5 */
1420 diskinfo[2] = capacity >> 11;
1421
1422 /* override with calculated, extended default, or driver values */
1423 if (host->hostt->bios_param)
1424 host->hostt->bios_param(sdp, bdev, capacity, diskinfo);
1425 else
1426 scsicam_bios_param(bdev, capacity, diskinfo);
1427
1428 geo->heads = diskinfo[0];
1429 geo->sectors = diskinfo[1];
1430 geo->cylinders = diskinfo[2];
1431 return 0;
1432}
1433
1434/**
1435 * sd_ioctl - process an ioctl
1436 * @bdev: target block device
1437 * @mode: FMODE_* mask
1438 * @cmd: ioctl command number
1439 * @arg: this is third argument given to ioctl(2) system call.
1440 * Often contains a pointer.
1441 *
1442 * Returns 0 if successful (some ioctls return positive numbers on
1443 * success as well). Returns a negated errno value in case of error.
1444 *
1445 * Note: most ioctls are forward onto the block subsystem or further
1446 * down in the scsi subsystem.
1447 **/
1448static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1449 unsigned int cmd, unsigned long arg)
1450{
1451 struct gendisk *disk = bdev->bd_disk;
1452 struct scsi_disk *sdkp = scsi_disk(disk);
1453 struct scsi_device *sdp = sdkp->device;
1454 void __user *p = (void __user *)arg;
1455 int error;
1456
1457 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1458 "cmd=0x%x\n", disk->disk_name, cmd));
1459
1460 error = scsi_verify_blk_ioctl(bdev, cmd);
1461 if (error < 0)
1462 return error;
1463
1464 /*
1465 * If we are in the middle of error recovery, don't let anyone
1466 * else try and use this device. Also, if error recovery fails, it
1467 * may try and take the device offline, in which case all further
1468 * access to the device is prohibited.
1469 */
1470 error = scsi_ioctl_block_when_processing_errors(sdp, cmd,
1471 (mode & FMODE_NDELAY) != 0);
1472 if (error)
1473 goto out;
1474
1475 if (is_sed_ioctl(cmd))
1476 return sed_ioctl(sdkp->opal_dev, cmd, p);
1477
1478 /*
1479 * Send SCSI addressing ioctls directly to mid level, send other
1480 * ioctls to block level and then onto mid level if they can't be
1481 * resolved.
1482 */
1483 switch (cmd) {
1484 case SCSI_IOCTL_GET_IDLUN:
1485 case SCSI_IOCTL_GET_BUS_NUMBER:
1486 error = scsi_ioctl(sdp, cmd, p);
1487 break;
1488 default:
1489 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1490 if (error != -ENOTTY)
1491 break;
1492 error = scsi_ioctl(sdp, cmd, p);
1493 break;
1494 }
1495out:
1496 return error;
1497}
1498
1499static void set_media_not_present(struct scsi_disk *sdkp)
1500{
1501 if (sdkp->media_present)
1502 sdkp->device->changed = 1;
1503
1504 if (sdkp->device->removable) {
1505 sdkp->media_present = 0;
1506 sdkp->capacity = 0;
1507 }
1508}
1509
1510static int media_not_present(struct scsi_disk *sdkp,
1511 struct scsi_sense_hdr *sshdr)
1512{
1513 if (!scsi_sense_valid(sshdr))
1514 return 0;
1515
1516 /* not invoked for commands that could return deferred errors */
1517 switch (sshdr->sense_key) {
1518 case UNIT_ATTENTION:
1519 case NOT_READY:
1520 /* medium not present */
1521 if (sshdr->asc == 0x3A) {
1522 set_media_not_present(sdkp);
1523 return 1;
1524 }
1525 }
1526 return 0;
1527}
1528
1529/**
1530 * sd_check_events - check media events
1531 * @disk: kernel device descriptor
1532 * @clearing: disk events currently being cleared
1533 *
1534 * Returns mask of DISK_EVENT_*.
1535 *
1536 * Note: this function is invoked from the block subsystem.
1537 **/
1538static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1539{
1540 struct scsi_disk *sdkp = scsi_disk_get(disk);
1541 struct scsi_device *sdp;
1542 int retval;
1543
1544 if (!sdkp)
1545 return 0;
1546
1547 sdp = sdkp->device;
1548 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1549
1550 /*
1551 * If the device is offline, don't send any commands - just pretend as
1552 * if the command failed. If the device ever comes back online, we
1553 * can deal with it then. It is only because of unrecoverable errors
1554 * that we would ever take a device offline in the first place.
1555 */
1556 if (!scsi_device_online(sdp)) {
1557 set_media_not_present(sdkp);
1558 goto out;
1559 }
1560
1561 /*
1562 * Using TEST_UNIT_READY enables differentiation between drive with
1563 * no cartridge loaded - NOT READY, drive with changed cartridge -
1564 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1565 *
1566 * Drives that auto spin down. eg iomega jaz 1G, will be started
1567 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1568 * sd_revalidate() is called.
1569 */
1570 if (scsi_block_when_processing_errors(sdp)) {
1571 struct scsi_sense_hdr sshdr = { 0, };
1572
1573 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1574 &sshdr);
1575
1576 /* failed to execute TUR, assume media not present */
1577 if (host_byte(retval)) {
1578 set_media_not_present(sdkp);
1579 goto out;
1580 }
1581
1582 if (media_not_present(sdkp, &sshdr))
1583 goto out;
1584 }
1585
1586 /*
1587 * For removable scsi disk we have to recognise the presence
1588 * of a disk in the drive.
1589 */
1590 if (!sdkp->media_present)
1591 sdp->changed = 1;
1592 sdkp->media_present = 1;
1593out:
1594 /*
1595 * sdp->changed is set under the following conditions:
1596 *
1597 * Medium present state has changed in either direction.
1598 * Device has indicated UNIT_ATTENTION.
1599 */
1600 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1601 sdp->changed = 0;
1602 scsi_disk_put(sdkp);
1603 return retval;
1604}
1605
1606static int sd_sync_cache(struct scsi_disk *sdkp, struct scsi_sense_hdr *sshdr)
1607{
1608 int retries, res;
1609 struct scsi_device *sdp = sdkp->device;
1610 const int timeout = sdp->request_queue->rq_timeout
1611 * SD_FLUSH_TIMEOUT_MULTIPLIER;
1612 struct scsi_sense_hdr my_sshdr;
1613
1614 if (!scsi_device_online(sdp))
1615 return -ENODEV;
1616
1617 /* caller might not be interested in sense, but we need it */
1618 if (!sshdr)
1619 sshdr = &my_sshdr;
1620
1621 for (retries = 3; retries > 0; --retries) {
1622 unsigned char cmd[10] = { 0 };
1623
1624 cmd[0] = SYNCHRONIZE_CACHE;
1625 /*
1626 * Leave the rest of the command zero to indicate
1627 * flush everything.
1628 */
1629 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, sshdr,
1630 timeout, SD_MAX_RETRIES, 0, RQF_PM, NULL);
1631 if (res == 0)
1632 break;
1633 }
1634
1635 if (res) {
1636 sd_print_result(sdkp, "Synchronize Cache(10) failed", res);
1637
1638 if (driver_byte(res) & DRIVER_SENSE)
1639 sd_print_sense_hdr(sdkp, sshdr);
1640
1641 /* we need to evaluate the error return */
1642 if (scsi_sense_valid(sshdr) &&
1643 (sshdr->asc == 0x3a || /* medium not present */
1644 sshdr->asc == 0x20)) /* invalid command */
1645 /* this is no error here */
1646 return 0;
1647
1648 switch (host_byte(res)) {
1649 /* ignore errors due to racing a disconnection */
1650 case DID_BAD_TARGET:
1651 case DID_NO_CONNECT:
1652 return 0;
1653 /* signal the upper layer it might try again */
1654 case DID_BUS_BUSY:
1655 case DID_IMM_RETRY:
1656 case DID_REQUEUE:
1657 case DID_SOFT_ERROR:
1658 return -EBUSY;
1659 default:
1660 return -EIO;
1661 }
1662 }
1663 return 0;
1664}
1665
1666static void sd_rescan(struct device *dev)
1667{
1668 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1669
1670 revalidate_disk(sdkp->disk);
1671}
1672
1673
1674#ifdef CONFIG_COMPAT
1675/*
1676 * This gets directly called from VFS. When the ioctl
1677 * is not recognized we go back to the other translation paths.
1678 */
1679static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1680 unsigned int cmd, unsigned long arg)
1681{
1682 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1683 int error;
1684
1685 error = scsi_ioctl_block_when_processing_errors(sdev, cmd,
1686 (mode & FMODE_NDELAY) != 0);
1687 if (error)
1688 return error;
1689
1690 /*
1691 * Let the static ioctl translation table take care of it.
1692 */
1693 if (!sdev->host->hostt->compat_ioctl)
1694 return -ENOIOCTLCMD;
1695 return sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1696}
1697#endif
1698
1699static char sd_pr_type(enum pr_type type)
1700{
1701 switch (type) {
1702 case PR_WRITE_EXCLUSIVE:
1703 return 0x01;
1704 case PR_EXCLUSIVE_ACCESS:
1705 return 0x03;
1706 case PR_WRITE_EXCLUSIVE_REG_ONLY:
1707 return 0x05;
1708 case PR_EXCLUSIVE_ACCESS_REG_ONLY:
1709 return 0x06;
1710 case PR_WRITE_EXCLUSIVE_ALL_REGS:
1711 return 0x07;
1712 case PR_EXCLUSIVE_ACCESS_ALL_REGS:
1713 return 0x08;
1714 default:
1715 return 0;
1716 }
1717};
1718
1719static int sd_pr_command(struct block_device *bdev, u8 sa,
1720 u64 key, u64 sa_key, u8 type, u8 flags)
1721{
1722 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1723 struct scsi_sense_hdr sshdr;
1724 int result;
1725 u8 cmd[16] = { 0, };
1726 u8 data[24] = { 0, };
1727
1728 cmd[0] = PERSISTENT_RESERVE_OUT;
1729 cmd[1] = sa;
1730 cmd[2] = type;
1731 put_unaligned_be32(sizeof(data), &cmd[5]);
1732
1733 put_unaligned_be64(key, &data[0]);
1734 put_unaligned_be64(sa_key, &data[8]);
1735 data[20] = flags;
1736
1737 result = scsi_execute_req(sdev, cmd, DMA_TO_DEVICE, &data, sizeof(data),
1738 &sshdr, SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1739
1740 if ((driver_byte(result) & DRIVER_SENSE) &&
1741 (scsi_sense_valid(&sshdr))) {
1742 sdev_printk(KERN_INFO, sdev, "PR command failed: %d\n", result);
1743 scsi_print_sense_hdr(sdev, NULL, &sshdr);
1744 }
1745
1746 return result;
1747}
1748
1749static int sd_pr_register(struct block_device *bdev, u64 old_key, u64 new_key,
1750 u32 flags)
1751{
1752 if (flags & ~PR_FL_IGNORE_KEY)
1753 return -EOPNOTSUPP;
1754 return sd_pr_command(bdev, (flags & PR_FL_IGNORE_KEY) ? 0x06 : 0x00,
1755 old_key, new_key, 0,
1756 (1 << 0) /* APTPL */);
1757}
1758
1759static int sd_pr_reserve(struct block_device *bdev, u64 key, enum pr_type type,
1760 u32 flags)
1761{
1762 if (flags)
1763 return -EOPNOTSUPP;
1764 return sd_pr_command(bdev, 0x01, key, 0, sd_pr_type(type), 0);
1765}
1766
1767static int sd_pr_release(struct block_device *bdev, u64 key, enum pr_type type)
1768{
1769 return sd_pr_command(bdev, 0x02, key, 0, sd_pr_type(type), 0);
1770}
1771
1772static int sd_pr_preempt(struct block_device *bdev, u64 old_key, u64 new_key,
1773 enum pr_type type, bool abort)
1774{
1775 return sd_pr_command(bdev, abort ? 0x05 : 0x04, old_key, new_key,
1776 sd_pr_type(type), 0);
1777}
1778
1779static int sd_pr_clear(struct block_device *bdev, u64 key)
1780{
1781 return sd_pr_command(bdev, 0x03, key, 0, 0, 0);
1782}
1783
1784static const struct pr_ops sd_pr_ops = {
1785 .pr_register = sd_pr_register,
1786 .pr_reserve = sd_pr_reserve,
1787 .pr_release = sd_pr_release,
1788 .pr_preempt = sd_pr_preempt,
1789 .pr_clear = sd_pr_clear,
1790};
1791
1792static const struct block_device_operations sd_fops = {
1793 .owner = THIS_MODULE,
1794 .open = sd_open,
1795 .release = sd_release,
1796 .ioctl = sd_ioctl,
1797 .getgeo = sd_getgeo,
1798#ifdef CONFIG_COMPAT
1799 .compat_ioctl = sd_compat_ioctl,
1800#endif
1801 .check_events = sd_check_events,
1802 .revalidate_disk = sd_revalidate_disk,
1803 .unlock_native_capacity = sd_unlock_native_capacity,
1804 .pr_ops = &sd_pr_ops,
1805};
1806
1807/**
1808 * sd_eh_reset - reset error handling callback
1809 * @scmd: sd-issued command that has failed
1810 *
1811 * This function is called by the SCSI midlayer before starting
1812 * SCSI EH. When counting medium access failures we have to be
1813 * careful to register it only only once per device and SCSI EH run;
1814 * there might be several timed out commands which will cause the
1815 * 'max_medium_access_timeouts' counter to trigger after the first
1816 * SCSI EH run already and set the device to offline.
1817 * So this function resets the internal counter before starting SCSI EH.
1818 **/
1819static void sd_eh_reset(struct scsi_cmnd *scmd)
1820{
1821 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1822
1823 /* New SCSI EH run, reset gate variable */
1824 sdkp->ignore_medium_access_errors = false;
1825}
1826
1827/**
1828 * sd_eh_action - error handling callback
1829 * @scmd: sd-issued command that has failed
1830 * @eh_disp: The recovery disposition suggested by the midlayer
1831 *
1832 * This function is called by the SCSI midlayer upon completion of an
1833 * error test command (currently TEST UNIT READY). The result of sending
1834 * the eh command is passed in eh_disp. We're looking for devices that
1835 * fail medium access commands but are OK with non access commands like
1836 * test unit ready (so wrongly see the device as having a successful
1837 * recovery)
1838 **/
1839static int sd_eh_action(struct scsi_cmnd *scmd, int eh_disp)
1840{
1841 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1842 struct scsi_device *sdev = scmd->device;
1843
1844 if (!scsi_device_online(sdev) ||
1845 !scsi_medium_access_command(scmd) ||
1846 host_byte(scmd->result) != DID_TIME_OUT ||
1847 eh_disp != SUCCESS)
1848 return eh_disp;
1849
1850 /*
1851 * The device has timed out executing a medium access command.
1852 * However, the TEST UNIT READY command sent during error
1853 * handling completed successfully. Either the device is in the
1854 * process of recovering or has it suffered an internal failure
1855 * that prevents access to the storage medium.
1856 */
1857 if (!sdkp->ignore_medium_access_errors) {
1858 sdkp->medium_access_timed_out++;
1859 sdkp->ignore_medium_access_errors = true;
1860 }
1861
1862 /*
1863 * If the device keeps failing read/write commands but TEST UNIT
1864 * READY always completes successfully we assume that medium
1865 * access is no longer possible and take the device offline.
1866 */
1867 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1868 scmd_printk(KERN_ERR, scmd,
1869 "Medium access timeout failure. Offlining disk!\n");
1870 mutex_lock(&sdev->state_mutex);
1871 scsi_device_set_state(sdev, SDEV_OFFLINE);
1872 mutex_unlock(&sdev->state_mutex);
1873
1874 return SUCCESS;
1875 }
1876
1877 return eh_disp;
1878}
1879
1880static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1881{
1882 struct request *req = scmd->request;
1883 struct scsi_device *sdev = scmd->device;
1884 unsigned int transferred, good_bytes;
1885 u64 start_lba, end_lba, bad_lba;
1886
1887 /*
1888 * Some commands have a payload smaller than the device logical
1889 * block size (e.g. INQUIRY on a 4K disk).
1890 */
1891 if (scsi_bufflen(scmd) <= sdev->sector_size)
1892 return 0;
1893
1894 /* Check if we have a 'bad_lba' information */
1895 if (!scsi_get_sense_info_fld(scmd->sense_buffer,
1896 SCSI_SENSE_BUFFERSIZE,
1897 &bad_lba))
1898 return 0;
1899
1900 /*
1901 * If the bad lba was reported incorrectly, we have no idea where
1902 * the error is.
1903 */
1904 start_lba = sectors_to_logical(sdev, blk_rq_pos(req));
1905 end_lba = start_lba + bytes_to_logical(sdev, scsi_bufflen(scmd));
1906 if (bad_lba < start_lba || bad_lba >= end_lba)
1907 return 0;
1908
1909 /*
1910 * resid is optional but mostly filled in. When it's unused,
1911 * its value is zero, so we assume the whole buffer transferred
1912 */
1913 transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1914
1915 /* This computation should always be done in terms of the
1916 * resolution of the device's medium.
1917 */
1918 good_bytes = logical_to_bytes(sdev, bad_lba - start_lba);
1919
1920 return min(good_bytes, transferred);
1921}
1922
1923/**
1924 * sd_done - bottom half handler: called when the lower level
1925 * driver has completed (successfully or otherwise) a scsi command.
1926 * @SCpnt: mid-level's per command structure.
1927 *
1928 * Note: potentially run from within an ISR. Must not block.
1929 **/
1930static int sd_done(struct scsi_cmnd *SCpnt)
1931{
1932 int result = SCpnt->result;
1933 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1934 unsigned int sector_size = SCpnt->device->sector_size;
1935 unsigned int resid;
1936 struct scsi_sense_hdr sshdr;
1937 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1938 struct request *req = SCpnt->request;
1939 int sense_valid = 0;
1940 int sense_deferred = 0;
1941
1942 switch (req_op(req)) {
1943 case REQ_OP_DISCARD:
1944 case REQ_OP_WRITE_ZEROES:
1945 case REQ_OP_WRITE_SAME:
1946 case REQ_OP_ZONE_RESET:
1947 if (!result) {
1948 good_bytes = blk_rq_bytes(req);
1949 scsi_set_resid(SCpnt, 0);
1950 } else {
1951 good_bytes = 0;
1952 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1953 }
1954 break;
1955 case REQ_OP_ZONE_REPORT:
1956 if (!result) {
1957 good_bytes = scsi_bufflen(SCpnt)
1958 - scsi_get_resid(SCpnt);
1959 scsi_set_resid(SCpnt, 0);
1960 } else {
1961 good_bytes = 0;
1962 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1963 }
1964 break;
1965 default:
1966 /*
1967 * In case of bogus fw or device, we could end up having
1968 * an unaligned partial completion. Check this here and force
1969 * alignment.
1970 */
1971 resid = scsi_get_resid(SCpnt);
1972 if (resid & (sector_size - 1)) {
1973 sd_printk(KERN_INFO, sdkp,
1974 "Unaligned partial completion (resid=%u, sector_sz=%u)\n",
1975 resid, sector_size);
1976 resid = min(scsi_bufflen(SCpnt),
1977 round_up(resid, sector_size));
1978 scsi_set_resid(SCpnt, resid);
1979 }
1980 }
1981
1982 if (result) {
1983 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1984 if (sense_valid)
1985 sense_deferred = scsi_sense_is_deferred(&sshdr);
1986 }
1987 sdkp->medium_access_timed_out = 0;
1988
1989 if (driver_byte(result) != DRIVER_SENSE &&
1990 (!sense_valid || sense_deferred))
1991 goto out;
1992
1993 switch (sshdr.sense_key) {
1994 case HARDWARE_ERROR:
1995 case MEDIUM_ERROR:
1996 good_bytes = sd_completed_bytes(SCpnt);
1997 break;
1998 case RECOVERED_ERROR:
1999 good_bytes = scsi_bufflen(SCpnt);
2000 break;
2001 case NO_SENSE:
2002 /* This indicates a false check condition, so ignore it. An
2003 * unknown amount of data was transferred so treat it as an
2004 * error.
2005 */
2006 SCpnt->result = 0;
2007 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
2008 break;
2009 case ABORTED_COMMAND:
2010 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
2011 good_bytes = sd_completed_bytes(SCpnt);
2012 break;
2013 case ILLEGAL_REQUEST:
2014 switch (sshdr.asc) {
2015 case 0x10: /* DIX: Host detected corruption */
2016 good_bytes = sd_completed_bytes(SCpnt);
2017 break;
2018 case 0x20: /* INVALID COMMAND OPCODE */
2019 case 0x24: /* INVALID FIELD IN CDB */
2020 switch (SCpnt->cmnd[0]) {
2021 case UNMAP:
2022 sd_config_discard(sdkp, SD_LBP_DISABLE);
2023 break;
2024 case WRITE_SAME_16:
2025 case WRITE_SAME:
2026 if (SCpnt->cmnd[1] & 8) { /* UNMAP */
2027 sd_config_discard(sdkp, SD_LBP_DISABLE);
2028 } else {
2029 sdkp->device->no_write_same = 1;
2030 sd_config_write_same(sdkp);
2031 req->__data_len = blk_rq_bytes(req);
2032 req->rq_flags |= RQF_QUIET;
2033 }
2034 break;
2035 }
2036 }
2037 break;
2038 default:
2039 break;
2040 }
2041
2042 out:
2043 if (sd_is_zoned(sdkp))
2044 sd_zbc_complete(SCpnt, good_bytes, &sshdr);
2045
2046 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
2047 "sd_done: completed %d of %d bytes\n",
2048 good_bytes, scsi_bufflen(SCpnt)));
2049
2050 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
2051 sd_dif_complete(SCpnt, good_bytes);
2052
2053 return good_bytes;
2054}
2055
2056/*
2057 * spinup disk - called only in sd_revalidate_disk()
2058 */
2059static void
2060sd_spinup_disk(struct scsi_disk *sdkp)
2061{
2062 unsigned char cmd[10];
2063 unsigned long spintime_expire = 0;
2064 int retries, spintime;
2065 unsigned int the_result;
2066 struct scsi_sense_hdr sshdr;
2067 int sense_valid = 0;
2068
2069 spintime = 0;
2070
2071 /* Spin up drives, as required. Only do this at boot time */
2072 /* Spinup needs to be done for module loads too. */
2073 do {
2074 retries = 0;
2075
2076 do {
2077 cmd[0] = TEST_UNIT_READY;
2078 memset((void *) &cmd[1], 0, 9);
2079
2080 the_result = scsi_execute_req(sdkp->device, cmd,
2081 DMA_NONE, NULL, 0,
2082 &sshdr, SD_TIMEOUT,
2083 SD_MAX_RETRIES, NULL);
2084
2085 /*
2086 * If the drive has indicated to us that it
2087 * doesn't have any media in it, don't bother
2088 * with any more polling.
2089 */
2090 if (media_not_present(sdkp, &sshdr))
2091 return;
2092
2093 if (the_result)
2094 sense_valid = scsi_sense_valid(&sshdr);
2095 retries++;
2096 } while (retries < 3 &&
2097 (!scsi_status_is_good(the_result) ||
2098 ((driver_byte(the_result) & DRIVER_SENSE) &&
2099 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
2100
2101 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
2102 /* no sense, TUR either succeeded or failed
2103 * with a status error */
2104 if(!spintime && !scsi_status_is_good(the_result)) {
2105 sd_print_result(sdkp, "Test Unit Ready failed",
2106 the_result);
2107 }
2108 break;
2109 }
2110
2111 /*
2112 * The device does not want the automatic start to be issued.
2113 */
2114 if (sdkp->device->no_start_on_add)
2115 break;
2116
2117 if (sense_valid && sshdr.sense_key == NOT_READY) {
2118 if (sshdr.asc == 4 && sshdr.ascq == 3)
2119 break; /* manual intervention required */
2120 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
2121 break; /* standby */
2122 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
2123 break; /* unavailable */
2124 if (sshdr.asc == 4 && sshdr.ascq == 0x1b)
2125 break; /* sanitize in progress */
2126 /*
2127 * Issue command to spin up drive when not ready
2128 */
2129 if (!spintime) {
2130 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
2131 cmd[0] = START_STOP;
2132 cmd[1] = 1; /* Return immediately */
2133 memset((void *) &cmd[2], 0, 8);
2134 cmd[4] = 1; /* Start spin cycle */
2135 if (sdkp->device->start_stop_pwr_cond)
2136 cmd[4] |= 1 << 4;
2137 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
2138 NULL, 0, &sshdr,
2139 SD_TIMEOUT, SD_MAX_RETRIES,
2140 NULL);
2141 spintime_expire = jiffies + 100 * HZ;
2142 spintime = 1;
2143 }
2144 /* Wait 1 second for next try */
2145 msleep(1000);
2146 printk(KERN_CONT ".");
2147
2148 /*
2149 * Wait for USB flash devices with slow firmware.
2150 * Yes, this sense key/ASC combination shouldn't
2151 * occur here. It's characteristic of these devices.
2152 */
2153 } else if (sense_valid &&
2154 sshdr.sense_key == UNIT_ATTENTION &&
2155 sshdr.asc == 0x28) {
2156 if (!spintime) {
2157 spintime_expire = jiffies + 5 * HZ;
2158 spintime = 1;
2159 }
2160 /* Wait 1 second for next try */
2161 msleep(1000);
2162 } else {
2163 /* we don't understand the sense code, so it's
2164 * probably pointless to loop */
2165 if(!spintime) {
2166 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
2167 sd_print_sense_hdr(sdkp, &sshdr);
2168 }
2169 break;
2170 }
2171
2172 } while (spintime && time_before_eq(jiffies, spintime_expire));
2173
2174 if (spintime) {
2175 if (scsi_status_is_good(the_result))
2176 printk(KERN_CONT "ready\n");
2177 else
2178 printk(KERN_CONT "not responding...\n");
2179 }
2180}
2181
2182/*
2183 * Determine whether disk supports Data Integrity Field.
2184 */
2185static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
2186{
2187 struct scsi_device *sdp = sdkp->device;
2188 u8 type;
2189 int ret = 0;
2190
2191 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
2192 return ret;
2193
2194 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
2195
2196 if (type > T10_PI_TYPE3_PROTECTION)
2197 ret = -ENODEV;
2198 else if (scsi_host_dif_capable(sdp->host, type))
2199 ret = 1;
2200
2201 if (sdkp->first_scan || type != sdkp->protection_type)
2202 switch (ret) {
2203 case -ENODEV:
2204 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
2205 " protection type %u. Disabling disk!\n",
2206 type);
2207 break;
2208 case 1:
2209 sd_printk(KERN_NOTICE, sdkp,
2210 "Enabling DIF Type %u protection\n", type);
2211 break;
2212 case 0:
2213 sd_printk(KERN_NOTICE, sdkp,
2214 "Disabling DIF Type %u protection\n", type);
2215 break;
2216 }
2217
2218 sdkp->protection_type = type;
2219
2220 return ret;
2221}
2222
2223static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
2224 struct scsi_sense_hdr *sshdr, int sense_valid,
2225 int the_result)
2226{
2227 if (driver_byte(the_result) & DRIVER_SENSE)
2228 sd_print_sense_hdr(sdkp, sshdr);
2229 else
2230 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
2231
2232 /*
2233 * Set dirty bit for removable devices if not ready -
2234 * sometimes drives will not report this properly.
2235 */
2236 if (sdp->removable &&
2237 sense_valid && sshdr->sense_key == NOT_READY)
2238 set_media_not_present(sdkp);
2239
2240 /*
2241 * We used to set media_present to 0 here to indicate no media
2242 * in the drive, but some drives fail read capacity even with
2243 * media present, so we can't do that.
2244 */
2245 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
2246}
2247
2248#define RC16_LEN 32
2249#if RC16_LEN > SD_BUF_SIZE
2250#error RC16_LEN must not be more than SD_BUF_SIZE
2251#endif
2252
2253#define READ_CAPACITY_RETRIES_ON_RESET 10
2254
2255/*
2256 * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
2257 * and the reported logical block size is bigger than 512 bytes. Note
2258 * that last_sector is a u64 and therefore logical_to_sectors() is not
2259 * applicable.
2260 */
2261static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
2262{
2263 u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
2264
2265 if (sizeof(sector_t) == 4 && last_sector > U32_MAX)
2266 return false;
2267
2268 return true;
2269}
2270
2271static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
2272 unsigned char *buffer)
2273{
2274 unsigned char cmd[16];
2275 struct scsi_sense_hdr sshdr;
2276 int sense_valid = 0;
2277 int the_result;
2278 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2279 unsigned int alignment;
2280 unsigned long long lba;
2281 unsigned sector_size;
2282
2283 if (sdp->no_read_capacity_16)
2284 return -EINVAL;
2285
2286 do {
2287 memset(cmd, 0, 16);
2288 cmd[0] = SERVICE_ACTION_IN_16;
2289 cmd[1] = SAI_READ_CAPACITY_16;
2290 cmd[13] = RC16_LEN;
2291 memset(buffer, 0, RC16_LEN);
2292
2293 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2294 buffer, RC16_LEN, &sshdr,
2295 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2296
2297 if (media_not_present(sdkp, &sshdr))
2298 return -ENODEV;
2299
2300 if (the_result) {
2301 sense_valid = scsi_sense_valid(&sshdr);
2302 if (sense_valid &&
2303 sshdr.sense_key == ILLEGAL_REQUEST &&
2304 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
2305 sshdr.ascq == 0x00)
2306 /* Invalid Command Operation Code or
2307 * Invalid Field in CDB, just retry
2308 * silently with RC10 */
2309 return -EINVAL;
2310 if (sense_valid &&
2311 sshdr.sense_key == UNIT_ATTENTION &&
2312 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2313 /* Device reset might occur several times,
2314 * give it one more chance */
2315 if (--reset_retries > 0)
2316 continue;
2317 }
2318 retries--;
2319
2320 } while (the_result && retries);
2321
2322 if (the_result) {
2323 sd_print_result(sdkp, "Read Capacity(16) failed", the_result);
2324 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2325 return -EINVAL;
2326 }
2327
2328 sector_size = get_unaligned_be32(&buffer[8]);
2329 lba = get_unaligned_be64(&buffer[0]);
2330
2331 if (sd_read_protection_type(sdkp, buffer) < 0) {
2332 sdkp->capacity = 0;
2333 return -ENODEV;
2334 }
2335
2336 if (!sd_addressable_capacity(lba, sector_size)) {
2337 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2338 "kernel compiled with support for large block "
2339 "devices.\n");
2340 sdkp->capacity = 0;
2341 return -EOVERFLOW;
2342 }
2343
2344 /* Logical blocks per physical block exponent */
2345 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2346
2347 /* RC basis */
2348 sdkp->rc_basis = (buffer[12] >> 4) & 0x3;
2349
2350 /* Lowest aligned logical block */
2351 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2352 blk_queue_alignment_offset(sdp->request_queue, alignment);
2353 if (alignment && sdkp->first_scan)
2354 sd_printk(KERN_NOTICE, sdkp,
2355 "physical block alignment offset: %u\n", alignment);
2356
2357 if (buffer[14] & 0x80) { /* LBPME */
2358 sdkp->lbpme = 1;
2359
2360 if (buffer[14] & 0x40) /* LBPRZ */
2361 sdkp->lbprz = 1;
2362
2363 sd_config_discard(sdkp, SD_LBP_WS16);
2364 }
2365
2366 sdkp->capacity = lba + 1;
2367 return sector_size;
2368}
2369
2370static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2371 unsigned char *buffer)
2372{
2373 unsigned char cmd[16];
2374 struct scsi_sense_hdr sshdr;
2375 int sense_valid = 0;
2376 int the_result;
2377 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2378 sector_t lba;
2379 unsigned sector_size;
2380
2381 do {
2382 cmd[0] = READ_CAPACITY;
2383 memset(&cmd[1], 0, 9);
2384 memset(buffer, 0, 8);
2385
2386 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2387 buffer, 8, &sshdr,
2388 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2389
2390 if (media_not_present(sdkp, &sshdr))
2391 return -ENODEV;
2392
2393 if (the_result) {
2394 sense_valid = scsi_sense_valid(&sshdr);
2395 if (sense_valid &&
2396 sshdr.sense_key == UNIT_ATTENTION &&
2397 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2398 /* Device reset might occur several times,
2399 * give it one more chance */
2400 if (--reset_retries > 0)
2401 continue;
2402 }
2403 retries--;
2404
2405 } while (the_result && retries);
2406
2407 if (the_result) {
2408 sd_print_result(sdkp, "Read Capacity(10) failed", the_result);
2409 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2410 return -EINVAL;
2411 }
2412
2413 sector_size = get_unaligned_be32(&buffer[4]);
2414 lba = get_unaligned_be32(&buffer[0]);
2415
2416 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2417 /* Some buggy (usb cardreader) devices return an lba of
2418 0xffffffff when the want to report a size of 0 (with
2419 which they really mean no media is present) */
2420 sdkp->capacity = 0;
2421 sdkp->physical_block_size = sector_size;
2422 return sector_size;
2423 }
2424
2425 if (!sd_addressable_capacity(lba, sector_size)) {
2426 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2427 "kernel compiled with support for large block "
2428 "devices.\n");
2429 sdkp->capacity = 0;
2430 return -EOVERFLOW;
2431 }
2432
2433 sdkp->capacity = lba + 1;
2434 sdkp->physical_block_size = sector_size;
2435 return sector_size;
2436}
2437
2438static int sd_try_rc16_first(struct scsi_device *sdp)
2439{
2440 if (sdp->host->max_cmd_len < 16)
2441 return 0;
2442 if (sdp->try_rc_10_first)
2443 return 0;
2444 if (sdp->scsi_level > SCSI_SPC_2)
2445 return 1;
2446 if (scsi_device_protection(sdp))
2447 return 1;
2448 return 0;
2449}
2450
2451/*
2452 * read disk capacity
2453 */
2454static void
2455sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2456{
2457 int sector_size;
2458 struct scsi_device *sdp = sdkp->device;
2459
2460 if (sd_try_rc16_first(sdp)) {
2461 sector_size = read_capacity_16(sdkp, sdp, buffer);
2462 if (sector_size == -EOVERFLOW)
2463 goto got_data;
2464 if (sector_size == -ENODEV)
2465 return;
2466 if (sector_size < 0)
2467 sector_size = read_capacity_10(sdkp, sdp, buffer);
2468 if (sector_size < 0)
2469 return;
2470 } else {
2471 sector_size = read_capacity_10(sdkp, sdp, buffer);
2472 if (sector_size == -EOVERFLOW)
2473 goto got_data;
2474 if (sector_size < 0)
2475 return;
2476 if ((sizeof(sdkp->capacity) > 4) &&
2477 (sdkp->capacity > 0xffffffffULL)) {
2478 int old_sector_size = sector_size;
2479 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2480 "Trying to use READ CAPACITY(16).\n");
2481 sector_size = read_capacity_16(sdkp, sdp, buffer);
2482 if (sector_size < 0) {
2483 sd_printk(KERN_NOTICE, sdkp,
2484 "Using 0xffffffff as device size\n");
2485 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2486 sector_size = old_sector_size;
2487 goto got_data;
2488 }
2489 /* Remember that READ CAPACITY(16) succeeded */
2490 sdp->try_rc_10_first = 0;
2491 }
2492 }
2493
2494 /* Some devices are known to return the total number of blocks,
2495 * not the highest block number. Some devices have versions
2496 * which do this and others which do not. Some devices we might
2497 * suspect of doing this but we don't know for certain.
2498 *
2499 * If we know the reported capacity is wrong, decrement it. If
2500 * we can only guess, then assume the number of blocks is even
2501 * (usually true but not always) and err on the side of lowering
2502 * the capacity.
2503 */
2504 if (sdp->fix_capacity ||
2505 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2506 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2507 "from its reported value: %llu\n",
2508 (unsigned long long) sdkp->capacity);
2509 --sdkp->capacity;
2510 }
2511
2512got_data:
2513 if (sector_size == 0) {
2514 sector_size = 512;
2515 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2516 "assuming 512.\n");
2517 }
2518
2519 if (sector_size != 512 &&
2520 sector_size != 1024 &&
2521 sector_size != 2048 &&
2522 sector_size != 4096) {
2523 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2524 sector_size);
2525 /*
2526 * The user might want to re-format the drive with
2527 * a supported sectorsize. Once this happens, it
2528 * would be relatively trivial to set the thing up.
2529 * For this reason, we leave the thing in the table.
2530 */
2531 sdkp->capacity = 0;
2532 /*
2533 * set a bogus sector size so the normal read/write
2534 * logic in the block layer will eventually refuse any
2535 * request on this device without tripping over power
2536 * of two sector size assumptions
2537 */
2538 sector_size = 512;
2539 }
2540 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2541 blk_queue_physical_block_size(sdp->request_queue,
2542 sdkp->physical_block_size);
2543 sdkp->device->sector_size = sector_size;
2544
2545 if (sdkp->capacity > 0xffffffff)
2546 sdp->use_16_for_rw = 1;
2547
2548}
2549
2550/*
2551 * Print disk capacity
2552 */
2553static void
2554sd_print_capacity(struct scsi_disk *sdkp,
2555 sector_t old_capacity)
2556{
2557 int sector_size = sdkp->device->sector_size;
2558 char cap_str_2[10], cap_str_10[10];
2559
2560 string_get_size(sdkp->capacity, sector_size,
2561 STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
2562 string_get_size(sdkp->capacity, sector_size,
2563 STRING_UNITS_10, cap_str_10,
2564 sizeof(cap_str_10));
2565
2566 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2567 sd_printk(KERN_NOTICE, sdkp,
2568 "%llu %d-byte logical blocks: (%s/%s)\n",
2569 (unsigned long long)sdkp->capacity,
2570 sector_size, cap_str_10, cap_str_2);
2571
2572 if (sdkp->physical_block_size != sector_size)
2573 sd_printk(KERN_NOTICE, sdkp,
2574 "%u-byte physical blocks\n",
2575 sdkp->physical_block_size);
2576
2577 sd_zbc_print_zones(sdkp);
2578 }
2579}
2580
2581/* called with buffer of length 512 */
2582static inline int
2583sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2584 unsigned char *buffer, int len, struct scsi_mode_data *data,
2585 struct scsi_sense_hdr *sshdr)
2586{
2587 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2588 SD_TIMEOUT, SD_MAX_RETRIES, data,
2589 sshdr);
2590}
2591
2592/*
2593 * read write protect setting, if possible - called only in sd_revalidate_disk()
2594 * called with buffer of length SD_BUF_SIZE
2595 */
2596static void
2597sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2598{
2599 int res;
2600 struct scsi_device *sdp = sdkp->device;
2601 struct scsi_mode_data data;
2602 int disk_ro = get_disk_ro(sdkp->disk);
2603 int old_wp = sdkp->write_prot;
2604
2605 set_disk_ro(sdkp->disk, 0);
2606 if (sdp->skip_ms_page_3f) {
2607 sd_first_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2608 return;
2609 }
2610
2611 if (sdp->use_192_bytes_for_3f) {
2612 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2613 } else {
2614 /*
2615 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2616 * We have to start carefully: some devices hang if we ask
2617 * for more than is available.
2618 */
2619 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2620
2621 /*
2622 * Second attempt: ask for page 0 When only page 0 is
2623 * implemented, a request for page 3F may return Sense Key
2624 * 5: Illegal Request, Sense Code 24: Invalid field in
2625 * CDB.
2626 */
2627 if (!scsi_status_is_good(res))
2628 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2629
2630 /*
2631 * Third attempt: ask 255 bytes, as we did earlier.
2632 */
2633 if (!scsi_status_is_good(res))
2634 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2635 &data, NULL);
2636 }
2637
2638 if (!scsi_status_is_good(res)) {
2639 sd_first_printk(KERN_WARNING, sdkp,
2640 "Test WP failed, assume Write Enabled\n");
2641 } else {
2642 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2643 set_disk_ro(sdkp->disk, sdkp->write_prot || disk_ro);
2644 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2645 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2646 sdkp->write_prot ? "on" : "off");
2647 sd_printk(KERN_DEBUG, sdkp, "Mode Sense: %4ph\n", buffer);
2648 }
2649 }
2650}
2651
2652/*
2653 * sd_read_cache_type - called only from sd_revalidate_disk()
2654 * called with buffer of length SD_BUF_SIZE
2655 */
2656static void
2657sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2658{
2659 int len = 0, res;
2660 struct scsi_device *sdp = sdkp->device;
2661
2662 int dbd;
2663 int modepage;
2664 int first_len;
2665 struct scsi_mode_data data;
2666 struct scsi_sense_hdr sshdr;
2667 int old_wce = sdkp->WCE;
2668 int old_rcd = sdkp->RCD;
2669 int old_dpofua = sdkp->DPOFUA;
2670
2671
2672 if (sdkp->cache_override)
2673 return;
2674
2675 first_len = 4;
2676 if (sdp->skip_ms_page_8) {
2677 if (sdp->type == TYPE_RBC)
2678 goto defaults;
2679 else {
2680 if (sdp->skip_ms_page_3f)
2681 goto defaults;
2682 modepage = 0x3F;
2683 if (sdp->use_192_bytes_for_3f)
2684 first_len = 192;
2685 dbd = 0;
2686 }
2687 } else if (sdp->type == TYPE_RBC) {
2688 modepage = 6;
2689 dbd = 8;
2690 } else {
2691 modepage = 8;
2692 dbd = 0;
2693 }
2694
2695 /* cautiously ask */
2696 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2697 &data, &sshdr);
2698
2699 if (!scsi_status_is_good(res))
2700 goto bad_sense;
2701
2702 if (!data.header_length) {
2703 modepage = 6;
2704 first_len = 0;
2705 sd_first_printk(KERN_ERR, sdkp,
2706 "Missing header in MODE_SENSE response\n");
2707 }
2708
2709 /* that went OK, now ask for the proper length */
2710 len = data.length;
2711
2712 /*
2713 * We're only interested in the first three bytes, actually.
2714 * But the data cache page is defined for the first 20.
2715 */
2716 if (len < 3)
2717 goto bad_sense;
2718 else if (len > SD_BUF_SIZE) {
2719 sd_first_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2720 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2721 len = SD_BUF_SIZE;
2722 }
2723 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2724 len = 192;
2725
2726 /* Get the data */
2727 if (len > first_len)
2728 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2729 &data, &sshdr);
2730
2731 if (scsi_status_is_good(res)) {
2732 int offset = data.header_length + data.block_descriptor_length;
2733
2734 while (offset < len) {
2735 u8 page_code = buffer[offset] & 0x3F;
2736 u8 spf = buffer[offset] & 0x40;
2737
2738 if (page_code == 8 || page_code == 6) {
2739 /* We're interested only in the first 3 bytes.
2740 */
2741 if (len - offset <= 2) {
2742 sd_first_printk(KERN_ERR, sdkp,
2743 "Incomplete mode parameter "
2744 "data\n");
2745 goto defaults;
2746 } else {
2747 modepage = page_code;
2748 goto Page_found;
2749 }
2750 } else {
2751 /* Go to the next page */
2752 if (spf && len - offset > 3)
2753 offset += 4 + (buffer[offset+2] << 8) +
2754 buffer[offset+3];
2755 else if (!spf && len - offset > 1)
2756 offset += 2 + buffer[offset+1];
2757 else {
2758 sd_first_printk(KERN_ERR, sdkp,
2759 "Incomplete mode "
2760 "parameter data\n");
2761 goto defaults;
2762 }
2763 }
2764 }
2765
2766 sd_first_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2767 goto defaults;
2768
2769 Page_found:
2770 if (modepage == 8) {
2771 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2772 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2773 } else {
2774 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2775 sdkp->RCD = 0;
2776 }
2777
2778 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2779 if (sdp->broken_fua) {
2780 sd_first_printk(KERN_NOTICE, sdkp, "Disabling FUA\n");
2781 sdkp->DPOFUA = 0;
2782 } else if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw &&
2783 !sdkp->device->use_16_for_rw) {
2784 sd_first_printk(KERN_NOTICE, sdkp,
2785 "Uses READ/WRITE(6), disabling FUA\n");
2786 sdkp->DPOFUA = 0;
2787 }
2788
2789 /* No cache flush allowed for write protected devices */
2790 if (sdkp->WCE && sdkp->write_prot)
2791 sdkp->WCE = 0;
2792
2793 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2794 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2795 sd_printk(KERN_NOTICE, sdkp,
2796 "Write cache: %s, read cache: %s, %s\n",
2797 sdkp->WCE ? "enabled" : "disabled",
2798 sdkp->RCD ? "disabled" : "enabled",
2799 sdkp->DPOFUA ? "supports DPO and FUA"
2800 : "doesn't support DPO or FUA");
2801
2802 return;
2803 }
2804
2805bad_sense:
2806 if (scsi_sense_valid(&sshdr) &&
2807 sshdr.sense_key == ILLEGAL_REQUEST &&
2808 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2809 /* Invalid field in CDB */
2810 sd_first_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2811 else
2812 sd_first_printk(KERN_ERR, sdkp,
2813 "Asking for cache data failed\n");
2814
2815defaults:
2816 if (sdp->wce_default_on) {
2817 sd_first_printk(KERN_NOTICE, sdkp,
2818 "Assuming drive cache: write back\n");
2819 sdkp->WCE = 1;
2820 } else {
2821 sd_first_printk(KERN_ERR, sdkp,
2822 "Assuming drive cache: write through\n");
2823 sdkp->WCE = 0;
2824 }
2825 sdkp->RCD = 0;
2826 sdkp->DPOFUA = 0;
2827}
2828
2829/*
2830 * The ATO bit indicates whether the DIF application tag is available
2831 * for use by the operating system.
2832 */
2833static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2834{
2835 int res, offset;
2836 struct scsi_device *sdp = sdkp->device;
2837 struct scsi_mode_data data;
2838 struct scsi_sense_hdr sshdr;
2839
2840 if (sdp->type != TYPE_DISK && sdp->type != TYPE_ZBC)
2841 return;
2842
2843 if (sdkp->protection_type == 0)
2844 return;
2845
2846 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2847 SD_MAX_RETRIES, &data, &sshdr);
2848
2849 if (!scsi_status_is_good(res) || !data.header_length ||
2850 data.length < 6) {
2851 sd_first_printk(KERN_WARNING, sdkp,
2852 "getting Control mode page failed, assume no ATO\n");
2853
2854 if (scsi_sense_valid(&sshdr))
2855 sd_print_sense_hdr(sdkp, &sshdr);
2856
2857 return;
2858 }
2859
2860 offset = data.header_length + data.block_descriptor_length;
2861
2862 if ((buffer[offset] & 0x3f) != 0x0a) {
2863 sd_first_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2864 return;
2865 }
2866
2867 if ((buffer[offset + 5] & 0x80) == 0)
2868 return;
2869
2870 sdkp->ATO = 1;
2871
2872 return;
2873}
2874
2875/**
2876 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2877 * @sdkp: disk to query
2878 */
2879static void sd_read_block_limits(struct scsi_disk *sdkp)
2880{
2881 unsigned int sector_sz = sdkp->device->sector_size;
2882 const int vpd_len = 64;
2883 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2884
2885 if (!buffer ||
2886 /* Block Limits VPD */
2887 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2888 goto out;
2889
2890 blk_queue_io_min(sdkp->disk->queue,
2891 get_unaligned_be16(&buffer[6]) * sector_sz);
2892
2893 sdkp->max_xfer_blocks = get_unaligned_be32(&buffer[8]);
2894 sdkp->opt_xfer_blocks = get_unaligned_be32(&buffer[12]);
2895
2896 if (buffer[3] == 0x3c) {
2897 unsigned int lba_count, desc_count;
2898
2899 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2900
2901 if (!sdkp->lbpme)
2902 goto out;
2903
2904 lba_count = get_unaligned_be32(&buffer[20]);
2905 desc_count = get_unaligned_be32(&buffer[24]);
2906
2907 if (lba_count && desc_count)
2908 sdkp->max_unmap_blocks = lba_count;
2909
2910 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2911
2912 if (buffer[32] & 0x80)
2913 sdkp->unmap_alignment =
2914 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2915
2916 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2917
2918 if (sdkp->max_unmap_blocks)
2919 sd_config_discard(sdkp, SD_LBP_UNMAP);
2920 else
2921 sd_config_discard(sdkp, SD_LBP_WS16);
2922
2923 } else { /* LBP VPD page tells us what to use */
2924 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2925 sd_config_discard(sdkp, SD_LBP_UNMAP);
2926 else if (sdkp->lbpws)
2927 sd_config_discard(sdkp, SD_LBP_WS16);
2928 else if (sdkp->lbpws10)
2929 sd_config_discard(sdkp, SD_LBP_WS10);
2930 else
2931 sd_config_discard(sdkp, SD_LBP_DISABLE);
2932 }
2933 }
2934
2935 out:
2936 kfree(buffer);
2937}
2938
2939/**
2940 * sd_read_block_characteristics - Query block dev. characteristics
2941 * @sdkp: disk to query
2942 */
2943static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2944{
2945 struct request_queue *q = sdkp->disk->queue;
2946 unsigned char *buffer;
2947 u16 rot;
2948 const int vpd_len = 64;
2949
2950 buffer = kmalloc(vpd_len, GFP_KERNEL);
2951
2952 if (!buffer ||
2953 /* Block Device Characteristics VPD */
2954 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2955 goto out;
2956
2957 rot = get_unaligned_be16(&buffer[4]);
2958
2959 if (rot == 1) {
2960 blk_queue_flag_set(QUEUE_FLAG_NONROT, q);
2961 blk_queue_flag_clear(QUEUE_FLAG_ADD_RANDOM, q);
2962 }
2963
2964 if (sdkp->device->type == TYPE_ZBC) {
2965 /* Host-managed */
2966 q->limits.zoned = BLK_ZONED_HM;
2967 } else {
2968 sdkp->zoned = (buffer[8] >> 4) & 3;
2969 if (sdkp->zoned == 1)
2970 /* Host-aware */
2971 q->limits.zoned = BLK_ZONED_HA;
2972 else
2973 /*
2974 * Treat drive-managed devices as
2975 * regular block devices.
2976 */
2977 q->limits.zoned = BLK_ZONED_NONE;
2978 }
2979 if (blk_queue_is_zoned(q) && sdkp->first_scan)
2980 sd_printk(KERN_NOTICE, sdkp, "Host-%s zoned block device\n",
2981 q->limits.zoned == BLK_ZONED_HM ? "managed" : "aware");
2982
2983 out:
2984 kfree(buffer);
2985}
2986
2987/**
2988 * sd_read_block_provisioning - Query provisioning VPD page
2989 * @sdkp: disk to query
2990 */
2991static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2992{
2993 unsigned char *buffer;
2994 const int vpd_len = 8;
2995
2996 if (sdkp->lbpme == 0)
2997 return;
2998
2999 buffer = kmalloc(vpd_len, GFP_KERNEL);
3000
3001 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
3002 goto out;
3003
3004 sdkp->lbpvpd = 1;
3005 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
3006 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
3007 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
3008
3009 out:
3010 kfree(buffer);
3011}
3012
3013static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
3014{
3015 struct scsi_device *sdev = sdkp->device;
3016
3017 if (sdev->host->no_write_same) {
3018 sdev->no_write_same = 1;
3019
3020 return;
3021 }
3022
3023 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
3024 /* too large values might cause issues with arcmsr */
3025 int vpd_buf_len = 64;
3026
3027 sdev->no_report_opcodes = 1;
3028
3029 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
3030 * CODES is unsupported and the device has an ATA
3031 * Information VPD page (SAT).
3032 */
3033 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
3034 sdev->no_write_same = 1;
3035 }
3036
3037 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
3038 sdkp->ws16 = 1;
3039
3040 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
3041 sdkp->ws10 = 1;
3042}
3043
3044static void sd_read_security(struct scsi_disk *sdkp, unsigned char *buffer)
3045{
3046 struct scsi_device *sdev = sdkp->device;
3047
3048 if (!sdev->security_supported)
3049 return;
3050
3051 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3052 SECURITY_PROTOCOL_IN) == 1 &&
3053 scsi_report_opcode(sdev, buffer, SD_BUF_SIZE,
3054 SECURITY_PROTOCOL_OUT) == 1)
3055 sdkp->security = 1;
3056}
3057
3058/**
3059 * sd_revalidate_disk - called the first time a new disk is seen,
3060 * performs disk spin up, read_capacity, etc.
3061 * @disk: struct gendisk we care about
3062 **/
3063static int sd_revalidate_disk(struct gendisk *disk)
3064{
3065 struct scsi_disk *sdkp = scsi_disk(disk);
3066 struct scsi_device *sdp = sdkp->device;
3067 struct request_queue *q = sdkp->disk->queue;
3068 sector_t old_capacity = sdkp->capacity;
3069 unsigned char *buffer;
3070 unsigned int dev_max, rw_max;
3071
3072 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
3073 "sd_revalidate_disk\n"));
3074
3075 /*
3076 * If the device is offline, don't try and read capacity or any
3077 * of the other niceties.
3078 */
3079 if (!scsi_device_online(sdp))
3080 goto out;
3081
3082 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
3083 if (!buffer) {
3084 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
3085 "allocation failure.\n");
3086 goto out;
3087 }
3088
3089 sd_spinup_disk(sdkp);
3090
3091 /*
3092 * Without media there is no reason to ask; moreover, some devices
3093 * react badly if we do.
3094 */
3095 if (sdkp->media_present) {
3096 sd_read_capacity(sdkp, buffer);
3097
3098 if (scsi_device_supports_vpd(sdp)) {
3099 sd_read_block_provisioning(sdkp);
3100 sd_read_block_limits(sdkp);
3101 sd_read_block_characteristics(sdkp);
3102 sd_zbc_read_zones(sdkp, buffer);
3103 }
3104
3105 sd_print_capacity(sdkp, old_capacity);
3106
3107 sd_read_write_protect_flag(sdkp, buffer);
3108 sd_read_cache_type(sdkp, buffer);
3109 sd_read_app_tag_own(sdkp, buffer);
3110 sd_read_write_same(sdkp, buffer);
3111 sd_read_security(sdkp, buffer);
3112 }
3113
3114 /*
3115 * We now have all cache related info, determine how we deal
3116 * with flush requests.
3117 */
3118 sd_set_flush_flag(sdkp);
3119
3120 /* Initial block count limit based on CDB TRANSFER LENGTH field size. */
3121 dev_max = sdp->use_16_for_rw ? SD_MAX_XFER_BLOCKS : SD_DEF_XFER_BLOCKS;
3122
3123 /* Some devices report a maximum block count for READ/WRITE requests. */
3124 dev_max = min_not_zero(dev_max, sdkp->max_xfer_blocks);
3125 q->limits.max_dev_sectors = logical_to_sectors(sdp, dev_max);
3126
3127 /*
3128 * Determine the device's preferred I/O size for reads and writes
3129 * unless the reported value is unreasonably small, large, or
3130 * garbage.
3131 */
3132 if (sdkp->opt_xfer_blocks &&
3133 sdkp->opt_xfer_blocks <= dev_max &&
3134 sdkp->opt_xfer_blocks <= SD_DEF_XFER_BLOCKS &&
3135 logical_to_bytes(sdp, sdkp->opt_xfer_blocks) >= PAGE_SIZE) {
3136 q->limits.io_opt = logical_to_bytes(sdp, sdkp->opt_xfer_blocks);
3137 rw_max = logical_to_sectors(sdp, sdkp->opt_xfer_blocks);
3138 } else
3139 rw_max = min_not_zero(logical_to_sectors(sdp, dev_max),
3140 (sector_t)BLK_DEF_MAX_SECTORS);
3141
3142 /* Do not exceed controller limit */
3143 rw_max = min(rw_max, queue_max_hw_sectors(q));
3144
3145 /*
3146 * Only update max_sectors if previously unset or if the current value
3147 * exceeds the capabilities of the hardware.
3148 */
3149 if (sdkp->first_scan ||
3150 q->limits.max_sectors > q->limits.max_dev_sectors ||
3151 q->limits.max_sectors > q->limits.max_hw_sectors)
3152 q->limits.max_sectors = rw_max;
3153
3154 sdkp->first_scan = 0;
3155
3156 set_capacity(disk, logical_to_sectors(sdp, sdkp->capacity));
3157 sd_config_write_same(sdkp);
3158 kfree(buffer);
3159
3160 out:
3161 return 0;
3162}
3163
3164/**
3165 * sd_unlock_native_capacity - unlock native capacity
3166 * @disk: struct gendisk to set capacity for
3167 *
3168 * Block layer calls this function if it detects that partitions
3169 * on @disk reach beyond the end of the device. If the SCSI host
3170 * implements ->unlock_native_capacity() method, it's invoked to
3171 * give it a chance to adjust the device capacity.
3172 *
3173 * CONTEXT:
3174 * Defined by block layer. Might sleep.
3175 */
3176static void sd_unlock_native_capacity(struct gendisk *disk)
3177{
3178 struct scsi_device *sdev = scsi_disk(disk)->device;
3179
3180 if (sdev->host->hostt->unlock_native_capacity)
3181 sdev->host->hostt->unlock_native_capacity(sdev);
3182}
3183
3184/**
3185 * sd_format_disk_name - format disk name
3186 * @prefix: name prefix - ie. "sd" for SCSI disks
3187 * @index: index of the disk to format name for
3188 * @buf: output buffer
3189 * @buflen: length of the output buffer
3190 *
3191 * SCSI disk names starts at sda. The 26th device is sdz and the
3192 * 27th is sdaa. The last one for two lettered suffix is sdzz
3193 * which is followed by sdaaa.
3194 *
3195 * This is basically 26 base counting with one extra 'nil' entry
3196 * at the beginning from the second digit on and can be
3197 * determined using similar method as 26 base conversion with the
3198 * index shifted -1 after each digit is computed.
3199 *
3200 * CONTEXT:
3201 * Don't care.
3202 *
3203 * RETURNS:
3204 * 0 on success, -errno on failure.
3205 */
3206static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
3207{
3208 const int base = 'z' - 'a' + 1;
3209 char *begin = buf + strlen(prefix);
3210 char *end = buf + buflen;
3211 char *p;
3212 int unit;
3213
3214 p = end - 1;
3215 *p = '\0';
3216 unit = base;
3217 do {
3218 if (p == begin)
3219 return -EINVAL;
3220 *--p = 'a' + (index % unit);
3221 index = (index / unit) - 1;
3222 } while (index >= 0);
3223
3224 memmove(begin, p, end - p);
3225 memcpy(buf, prefix, strlen(prefix));
3226
3227 return 0;
3228}
3229
3230/*
3231 * The asynchronous part of sd_probe
3232 */
3233static void sd_probe_async(void *data, async_cookie_t cookie)
3234{
3235 struct scsi_disk *sdkp = data;
3236 struct scsi_device *sdp;
3237 struct gendisk *gd;
3238 u32 index;
3239 struct device *dev;
3240
3241 sdp = sdkp->device;
3242 gd = sdkp->disk;
3243 index = sdkp->index;
3244 dev = &sdp->sdev_gendev;
3245
3246 gd->major = sd_major((index & 0xf0) >> 4);
3247 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
3248
3249 gd->fops = &sd_fops;
3250 gd->private_data = &sdkp->driver;
3251 gd->queue = sdkp->device->request_queue;
3252
3253 /* defaults, until the device tells us otherwise */
3254 sdp->sector_size = 512;
3255 sdkp->capacity = 0;
3256 sdkp->media_present = 1;
3257 sdkp->write_prot = 0;
3258 sdkp->cache_override = 0;
3259 sdkp->WCE = 0;
3260 sdkp->RCD = 0;
3261 sdkp->ATO = 0;
3262 sdkp->first_scan = 1;
3263 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
3264
3265 sd_revalidate_disk(gd);
3266
3267 gd->flags = GENHD_FL_EXT_DEVT;
3268 if (sdp->removable) {
3269 gd->flags |= GENHD_FL_REMOVABLE;
3270 gd->events |= DISK_EVENT_MEDIA_CHANGE;
3271 }
3272
3273 blk_pm_runtime_init(sdp->request_queue, dev);
3274 device_add_disk(dev, gd);
3275 if (sdkp->capacity)
3276 sd_dif_config_host(sdkp);
3277
3278 sd_revalidate_disk(gd);
3279
3280 if (sdkp->security) {
3281 sdkp->opal_dev = init_opal_dev(sdp, &sd_sec_submit);
3282 if (sdkp->opal_dev)
3283 sd_printk(KERN_NOTICE, sdkp, "supports TCG Opal\n");
3284 }
3285
3286 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
3287 sdp->removable ? "removable " : "");
3288 scsi_autopm_put_device(sdp);
3289 put_device(&sdkp->dev);
3290}
3291
3292/**
3293 * sd_probe - called during driver initialization and whenever a
3294 * new scsi device is attached to the system. It is called once
3295 * for each scsi device (not just disks) present.
3296 * @dev: pointer to device object
3297 *
3298 * Returns 0 if successful (or not interested in this scsi device
3299 * (e.g. scanner)); 1 when there is an error.
3300 *
3301 * Note: this function is invoked from the scsi mid-level.
3302 * This function sets up the mapping between a given
3303 * <host,channel,id,lun> (found in sdp) and new device name
3304 * (e.g. /dev/sda). More precisely it is the block device major
3305 * and minor number that is chosen here.
3306 *
3307 * Assume sd_probe is not re-entrant (for time being)
3308 * Also think about sd_probe() and sd_remove() running coincidentally.
3309 **/
3310static int sd_probe(struct device *dev)
3311{
3312 struct scsi_device *sdp = to_scsi_device(dev);
3313 struct scsi_disk *sdkp;
3314 struct gendisk *gd;
3315 int index;
3316 int error;
3317
3318 scsi_autopm_get_device(sdp);
3319 error = -ENODEV;
3320 if (sdp->type != TYPE_DISK &&
3321 sdp->type != TYPE_ZBC &&
3322 sdp->type != TYPE_MOD &&
3323 sdp->type != TYPE_RBC)
3324 goto out;
3325
3326#ifndef CONFIG_BLK_DEV_ZONED
3327 if (sdp->type == TYPE_ZBC)
3328 goto out;
3329#endif
3330 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
3331 "sd_probe\n"));
3332
3333 error = -ENOMEM;
3334 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
3335 if (!sdkp)
3336 goto out;
3337
3338 gd = alloc_disk(SD_MINORS);
3339 if (!gd)
3340 goto out_free;
3341
3342 do {
3343 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
3344 goto out_put;
3345
3346 spin_lock(&sd_index_lock);
3347 error = ida_get_new(&sd_index_ida, &index);
3348 spin_unlock(&sd_index_lock);
3349 } while (error == -EAGAIN);
3350
3351 if (error) {
3352 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
3353 goto out_put;
3354 }
3355
3356 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
3357 if (error) {
3358 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
3359 goto out_free_index;
3360 }
3361
3362 sdkp->device = sdp;
3363 sdkp->driver = &sd_template;
3364 sdkp->disk = gd;
3365 sdkp->index = index;
3366 atomic_set(&sdkp->openers, 0);
3367 atomic_set(&sdkp->device->ioerr_cnt, 0);
3368
3369 if (!sdp->request_queue->rq_timeout) {
3370 if (sdp->type != TYPE_MOD)
3371 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
3372 else
3373 blk_queue_rq_timeout(sdp->request_queue,
3374 SD_MOD_TIMEOUT);
3375 }
3376
3377 device_initialize(&sdkp->dev);
3378 sdkp->dev.parent = dev;
3379 sdkp->dev.class = &sd_disk_class;
3380 dev_set_name(&sdkp->dev, "%s", dev_name(dev));
3381
3382 error = device_add(&sdkp->dev);
3383 if (error)
3384 goto out_free_index;
3385
3386 get_device(dev);
3387 dev_set_drvdata(dev, sdkp);
3388
3389 get_device(&sdkp->dev); /* prevent release before async_schedule */
3390 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3391
3392 return 0;
3393
3394 out_free_index:
3395 spin_lock(&sd_index_lock);
3396 ida_remove(&sd_index_ida, index);
3397 spin_unlock(&sd_index_lock);
3398 out_put:
3399 put_disk(gd);
3400 out_free:
3401 kfree(sdkp);
3402 out:
3403 scsi_autopm_put_device(sdp);
3404 return error;
3405}
3406
3407/**
3408 * sd_remove - called whenever a scsi disk (previously recognized by
3409 * sd_probe) is detached from the system. It is called (potentially
3410 * multiple times) during sd module unload.
3411 * @dev: pointer to device object
3412 *
3413 * Note: this function is invoked from the scsi mid-level.
3414 * This function potentially frees up a device name (e.g. /dev/sdc)
3415 * that could be re-used by a subsequent sd_probe().
3416 * This function is not called when the built-in sd driver is "exit-ed".
3417 **/
3418static int sd_remove(struct device *dev)
3419{
3420 struct scsi_disk *sdkp;
3421 dev_t devt;
3422
3423 sdkp = dev_get_drvdata(dev);
3424 devt = disk_devt(sdkp->disk);
3425 scsi_autopm_get_device(sdkp->device);
3426
3427 async_synchronize_full_domain(&scsi_sd_pm_domain);
3428 async_synchronize_full_domain(&scsi_sd_probe_domain);
3429 device_del(&sdkp->dev);
3430 del_gendisk(sdkp->disk);
3431 sd_shutdown(dev);
3432
3433 sd_zbc_remove(sdkp);
3434
3435 free_opal_dev(sdkp->opal_dev);
3436
3437 blk_register_region(devt, SD_MINORS, NULL,
3438 sd_default_probe, NULL, NULL);
3439
3440 mutex_lock(&sd_ref_mutex);
3441 dev_set_drvdata(dev, NULL);
3442 put_device(&sdkp->dev);
3443 mutex_unlock(&sd_ref_mutex);
3444
3445 return 0;
3446}
3447
3448/**
3449 * scsi_disk_release - Called to free the scsi_disk structure
3450 * @dev: pointer to embedded class device
3451 *
3452 * sd_ref_mutex must be held entering this routine. Because it is
3453 * called on last put, you should always use the scsi_disk_get()
3454 * scsi_disk_put() helpers which manipulate the semaphore directly
3455 * and never do a direct put_device.
3456 **/
3457static void scsi_disk_release(struct device *dev)
3458{
3459 struct scsi_disk *sdkp = to_scsi_disk(dev);
3460 struct gendisk *disk = sdkp->disk;
3461
3462 spin_lock(&sd_index_lock);
3463 ida_remove(&sd_index_ida, sdkp->index);
3464 spin_unlock(&sd_index_lock);
3465
3466 disk->private_data = NULL;
3467 put_disk(disk);
3468 put_device(&sdkp->device->sdev_gendev);
3469
3470 kfree(sdkp);
3471}
3472
3473static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3474{
3475 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3476 struct scsi_sense_hdr sshdr;
3477 struct scsi_device *sdp = sdkp->device;
3478 int res;
3479
3480 if (start)
3481 cmd[4] |= 1; /* START */
3482
3483 if (sdp->start_stop_pwr_cond)
3484 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3485
3486 if (!scsi_device_online(sdp))
3487 return -ENODEV;
3488
3489 res = scsi_execute(sdp, cmd, DMA_NONE, NULL, 0, NULL, &sshdr,
3490 SD_TIMEOUT, SD_MAX_RETRIES, 0, RQF_PM, NULL);
3491 if (res) {
3492 sd_print_result(sdkp, "Start/Stop Unit failed", res);
3493 if (driver_byte(res) & DRIVER_SENSE)
3494 sd_print_sense_hdr(sdkp, &sshdr);
3495 if (scsi_sense_valid(&sshdr) &&
3496 /* 0x3a is medium not present */
3497 sshdr.asc == 0x3a)
3498 res = 0;
3499 }
3500
3501 /* SCSI error codes must not go to the generic layer */
3502 if (res)
3503 return -EIO;
3504
3505 return 0;
3506}
3507
3508/*
3509 * Send a SYNCHRONIZE CACHE instruction down to the device through
3510 * the normal SCSI command structure. Wait for the command to
3511 * complete.
3512 */
3513static void sd_shutdown(struct device *dev)
3514{
3515 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3516
3517 if (!sdkp)
3518 return; /* this can happen */
3519
3520 if (pm_runtime_suspended(dev))
3521 return;
3522
3523 if (sdkp->WCE && sdkp->media_present) {
3524 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3525 sd_sync_cache(sdkp, NULL);
3526 }
3527
3528 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3529 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3530 sd_start_stop_device(sdkp, 0);
3531 }
3532}
3533
3534static int sd_suspend_common(struct device *dev, bool ignore_stop_errors)
3535{
3536 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3537 struct scsi_sense_hdr sshdr;
3538 int ret = 0;
3539
3540 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3541 return 0;
3542
3543 if (sdkp->WCE && sdkp->media_present) {
3544 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3545 ret = sd_sync_cache(sdkp, &sshdr);
3546
3547 if (ret) {
3548 /* ignore OFFLINE device */
3549 if (ret == -ENODEV)
3550 return 0;
3551
3552 if (!scsi_sense_valid(&sshdr) ||
3553 sshdr.sense_key != ILLEGAL_REQUEST)
3554 return ret;
3555
3556 /*
3557 * sshdr.sense_key == ILLEGAL_REQUEST means this drive
3558 * doesn't support sync. There's not much to do and
3559 * suspend shouldn't fail.
3560 */
3561 ret = 0;
3562 }
3563 }
3564
3565 if (sdkp->device->manage_start_stop) {
3566 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3567 /* an error is not worth aborting a system sleep */
3568 ret = sd_start_stop_device(sdkp, 0);
3569 if (ignore_stop_errors)
3570 ret = 0;
3571 }
3572
3573 return ret;
3574}
3575
3576static int sd_suspend_system(struct device *dev)
3577{
3578 return sd_suspend_common(dev, true);
3579}
3580
3581static int sd_suspend_runtime(struct device *dev)
3582{
3583 return sd_suspend_common(dev, false);
3584}
3585
3586static int sd_resume(struct device *dev)
3587{
3588 struct scsi_disk *sdkp = dev_get_drvdata(dev);
3589 int ret;
3590
3591 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3592 return 0;
3593
3594 if (!sdkp->device->manage_start_stop)
3595 return 0;
3596
3597 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3598 ret = sd_start_stop_device(sdkp, 1);
3599 if (!ret)
3600 opal_unlock_from_suspend(sdkp->opal_dev);
3601 return ret;
3602}
3603
3604/**
3605 * init_sd - entry point for this driver (both when built in or when
3606 * a module).
3607 *
3608 * Note: this function registers this driver with the scsi mid-level.
3609 **/
3610static int __init init_sd(void)
3611{
3612 int majors = 0, i, err;
3613
3614 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3615
3616 for (i = 0; i < SD_MAJORS; i++) {
3617 if (register_blkdev(sd_major(i), "sd") != 0)
3618 continue;
3619 majors++;
3620 blk_register_region(sd_major(i), SD_MINORS, NULL,
3621 sd_default_probe, NULL, NULL);
3622 }
3623
3624 if (!majors)
3625 return -ENODEV;
3626
3627 err = class_register(&sd_disk_class);
3628 if (err)
3629 goto err_out;
3630
3631 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3632 0, 0, NULL);
3633 if (!sd_cdb_cache) {
3634 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3635 err = -ENOMEM;
3636 goto err_out_class;
3637 }
3638
3639 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3640 if (!sd_cdb_pool) {
3641 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3642 err = -ENOMEM;
3643 goto err_out_cache;
3644 }
3645
3646 err = scsi_register_driver(&sd_template.gendrv);
3647 if (err)
3648 goto err_out_driver;
3649
3650 return 0;
3651
3652err_out_driver:
3653 mempool_destroy(sd_cdb_pool);
3654
3655err_out_cache:
3656 kmem_cache_destroy(sd_cdb_cache);
3657
3658err_out_class:
3659 class_unregister(&sd_disk_class);
3660err_out:
3661 for (i = 0; i < SD_MAJORS; i++)
3662 unregister_blkdev(sd_major(i), "sd");
3663 return err;
3664}
3665
3666/**
3667 * exit_sd - exit point for this driver (when it is a module).
3668 *
3669 * Note: this function unregisters this driver from the scsi mid-level.
3670 **/
3671static void __exit exit_sd(void)
3672{
3673 int i;
3674
3675 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3676
3677 scsi_unregister_driver(&sd_template.gendrv);
3678 mempool_destroy(sd_cdb_pool);
3679 kmem_cache_destroy(sd_cdb_cache);
3680
3681 class_unregister(&sd_disk_class);
3682
3683 for (i = 0; i < SD_MAJORS; i++) {
3684 blk_unregister_region(sd_major(i), SD_MINORS);
3685 unregister_blkdev(sd_major(i), "sd");
3686 }
3687}
3688
3689module_init(init_sd);
3690module_exit(exit_sd);
3691
3692static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3693 struct scsi_sense_hdr *sshdr)
3694{
3695 scsi_print_sense_hdr(sdkp->device,
3696 sdkp->disk ? sdkp->disk->disk_name : NULL, sshdr);
3697}
3698
3699static void sd_print_result(const struct scsi_disk *sdkp, const char *msg,
3700 int result)
3701{
3702 const char *hb_string = scsi_hostbyte_string(result);
3703 const char *db_string = scsi_driverbyte_string(result);
3704
3705 if (hb_string || db_string)
3706 sd_printk(KERN_INFO, sdkp,
3707 "%s: Result: hostbyte=%s driverbyte=%s\n", msg,
3708 hb_string ? hb_string : "invalid",
3709 db_string ? db_string : "invalid");
3710 else
3711 sd_printk(KERN_INFO, sdkp,
3712 "%s: Result: hostbyte=0x%02x driverbyte=0x%02x\n",
3713 msg, host_byte(result), driver_byte(result));
3714}
3715