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