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