?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
sparc64: Use kstack_valid() in die_if_kernel().
[linux/fpc-iii.git] / drivers / scsi / sd.c
blob255da53e5a01a1dd970fac95b2106888b6e91c6b
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 <asm/uaccess.h>
53 #include <asm/unaligned.h>
54
55 #include <scsi/scsi.h>
56 #include <scsi/scsi_cmnd.h>
57 #include <scsi/scsi_dbg.h>
58 #include <scsi/scsi_device.h>
59 #include <scsi/scsi_driver.h>
60 #include <scsi/scsi_eh.h>
61 #include <scsi/scsi_host.h>
62 #include <scsi/scsi_ioctl.h>
63 #include <scsi/scsicam.h>
64
65 #include "sd.h"
66 #include "scsi_logging.h"
67
68 MODULE_AUTHOR("Eric Youngdale");
69 MODULE_DESCRIPTION("SCSI disk (sd) driver");
70 MODULE_LICENSE("GPL");
71
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
88 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
89 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
91
92 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
93 #define SD_MINORS 16
94 #else
95 #define SD_MINORS 0
96 #endif
97
98 static int sd_revalidate_disk(struct gendisk *);
99 static int sd_probe(struct device *);
100 static int sd_remove(struct device *);
101 static void sd_shutdown(struct device *);
102 static int sd_suspend(struct device *, pm_message_t state);
103 static int sd_resume(struct device *);
104 static void sd_rescan(struct device *);
105 static int sd_done(struct scsi_cmnd *);
106 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
107 static void scsi_disk_release(struct device *cdev);
108 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
109 static void sd_print_result(struct scsi_disk *, int);
110
111 static DEFINE_SPINLOCK(sd_index_lock);
112 static DEFINE_IDA(sd_index_ida);
113
114 /* This semaphore is used to mediate the 0->1 reference get in the
115 * face of object destruction (i.e. we can't allow a get on an
116 * object after last put) */
117 static DEFINE_MUTEX(sd_ref_mutex);
118
119 struct kmem_cache *sd_cdb_cache;
120 mempool_t *sd_cdb_pool;
121
122 static const char *sd_cache_types[] = {
123 "write through", "none", "write back",
124 "write back, no read (daft)"
125 };
126
127 static ssize_t
128 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
129 const char *buf, size_t count)
130 {
131 int i, ct = -1, rcd, wce, sp;
132 struct scsi_disk *sdkp = to_scsi_disk(dev);
133 struct scsi_device *sdp = sdkp->device;
134 char buffer[64];
135 char *buffer_data;
136 struct scsi_mode_data data;
137 struct scsi_sense_hdr sshdr;
138 int len;
139
140 if (sdp->type != TYPE_DISK)
141 /* no cache control on RBC devices; theoretically they
142 * can do it, but there's probably so many exceptions
143 * it's not worth the risk */
144 return -EINVAL;
145
146 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
147 const int len = strlen(sd_cache_types[i]);
148 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
149 buf[len] == '\n') {
150 ct = i;
151 break;
152 }
153 }
154 if (ct < 0)
155 return -EINVAL;
156 rcd = ct & 0x01 ? 1 : 0;
157 wce = ct & 0x02 ? 1 : 0;
158 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
159 SD_MAX_RETRIES, &data, NULL))
160 return -EINVAL;
161 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
162 data.block_descriptor_length);
163 buffer_data = buffer + data.header_length +
164 data.block_descriptor_length;
165 buffer_data[2] &= ~0x05;
166 buffer_data[2] |= wce << 2 | rcd;
167 sp = buffer_data[0] & 0x80 ? 1 : 0;
168
169 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
170 SD_MAX_RETRIES, &data, &sshdr)) {
171 if (scsi_sense_valid(&sshdr))
172 sd_print_sense_hdr(sdkp, &sshdr);
173 return -EINVAL;
174 }
175 revalidate_disk(sdkp->disk);
176 return count;
177 }
178
179 static ssize_t
180 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
181 const char *buf, size_t count)
182 {
183 struct scsi_disk *sdkp = to_scsi_disk(dev);
184 struct scsi_device *sdp = sdkp->device;
185
186 if (!capable(CAP_SYS_ADMIN))
187 return -EACCES;
188
189 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
190
191 return count;
192 }
193
194 static ssize_t
195 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
196 const char *buf, size_t count)
197 {
198 struct scsi_disk *sdkp = to_scsi_disk(dev);
199 struct scsi_device *sdp = sdkp->device;
200
201 if (!capable(CAP_SYS_ADMIN))
202 return -EACCES;
203
204 if (sdp->type != TYPE_DISK)
205 return -EINVAL;
206
207 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
208
209 return count;
210 }
211
212 static ssize_t
213 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
214 char *buf)
215 {
216 struct scsi_disk *sdkp = to_scsi_disk(dev);
217 int ct = sdkp->RCD + 2*sdkp->WCE;
218
219 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
220 }
221
222 static ssize_t
223 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
224 {
225 struct scsi_disk *sdkp = to_scsi_disk(dev);
226
227 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
228 }
229
230 static ssize_t
231 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
232 char *buf)
233 {
234 struct scsi_disk *sdkp = to_scsi_disk(dev);
235 struct scsi_device *sdp = sdkp->device;
236
237 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
238 }
239
240 static ssize_t
241 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
242 char *buf)
243 {
244 struct scsi_disk *sdkp = to_scsi_disk(dev);
245
246 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
247 }
248
249 static ssize_t
250 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
251 char *buf)
252 {
253 struct scsi_disk *sdkp = to_scsi_disk(dev);
254
255 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
256 }
257
258 static ssize_t
259 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
260 char *buf)
261 {
262 struct scsi_disk *sdkp = to_scsi_disk(dev);
263
264 return snprintf(buf, 20, "%u\n", sdkp->ATO);
265 }
266
267 static ssize_t
268 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
269 char *buf)
270 {
271 struct scsi_disk *sdkp = to_scsi_disk(dev);
272
273 return snprintf(buf, 20, "%u\n", sdkp->thin_provisioning);
274 }
275
276 static struct device_attribute sd_disk_attrs[] = {
277 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
278 sd_store_cache_type),
279 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
280 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
281 sd_store_allow_restart),
282 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
283 sd_store_manage_start_stop),
284 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
285 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
286 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
287 __ATTR_NULL,
288 };
289
290 static struct class sd_disk_class = {
291 .name = "scsi_disk",
292 .owner = THIS_MODULE,
293 .dev_release = scsi_disk_release,
294 .dev_attrs = sd_disk_attrs,
295 };
296
297 static struct scsi_driver sd_template = {
298 .owner = THIS_MODULE,
299 .gendrv = {
300 .name = "sd",
301 .probe = sd_probe,
302 .remove = sd_remove,
303 .suspend = sd_suspend,
304 .resume = sd_resume,
305 .shutdown = sd_shutdown,
306 },
307 .rescan = sd_rescan,
308 .done = sd_done,
309 };
310
311 /*
312 * Device no to disk mapping:
313 *
314 * major disc2 disc p1
315 * |............|.............|....|....| <- dev_t
316 * 31 20 19 8 7 4 3 0
317 *
318 * Inside a major, we have 16k disks, however mapped non-
319 * contiguously. The first 16 disks are for major0, the next
320 * ones with major1, ... Disk 256 is for major0 again, disk 272
321 * for major1, ...
322 * As we stay compatible with our numbering scheme, we can reuse
323 * the well-know SCSI majors 8, 65--71, 136--143.
324 */
325 static int sd_major(int major_idx)
326 {
327 switch (major_idx) {
328 case 0:
329 return SCSI_DISK0_MAJOR;
330 case 1 ... 7:
331 return SCSI_DISK1_MAJOR + major_idx - 1;
332 case 8 ... 15:
333 return SCSI_DISK8_MAJOR + major_idx - 8;
334 default:
335 BUG();
336 return 0; /* shut up gcc */
337 }
338 }
339
340 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
341 {
342 struct scsi_disk *sdkp = NULL;
343
344 if (disk->private_data) {
345 sdkp = scsi_disk(disk);
346 if (scsi_device_get(sdkp->device) == 0)
347 get_device(&sdkp->dev);
348 else
349 sdkp = NULL;
350 }
351 return sdkp;
352 }
353
354 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
355 {
356 struct scsi_disk *sdkp;
357
358 mutex_lock(&sd_ref_mutex);
359 sdkp = __scsi_disk_get(disk);
360 mutex_unlock(&sd_ref_mutex);
361 return sdkp;
362 }
363
364 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
365 {
366 struct scsi_disk *sdkp;
367
368 mutex_lock(&sd_ref_mutex);
369 sdkp = dev_get_drvdata(dev);
370 if (sdkp)
371 sdkp = __scsi_disk_get(sdkp->disk);
372 mutex_unlock(&sd_ref_mutex);
373 return sdkp;
374 }
375
376 static void scsi_disk_put(struct scsi_disk *sdkp)
377 {
378 struct scsi_device *sdev = sdkp->device;
379
380 mutex_lock(&sd_ref_mutex);
381 put_device(&sdkp->dev);
382 scsi_device_put(sdev);
383 mutex_unlock(&sd_ref_mutex);
384 }
385
386 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
387 {
388 unsigned int prot_op = SCSI_PROT_NORMAL;
389 unsigned int dix = scsi_prot_sg_count(scmd);
390
391 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
392 if (dif && dix)
393 prot_op = SCSI_PROT_READ_PASS;
394 else if (dif && !dix)
395 prot_op = SCSI_PROT_READ_STRIP;
396 else if (!dif && dix)
397 prot_op = SCSI_PROT_READ_INSERT;
398 } else {
399 if (dif && dix)
400 prot_op = SCSI_PROT_WRITE_PASS;
401 else if (dif && !dix)
402 prot_op = SCSI_PROT_WRITE_INSERT;
403 else if (!dif && dix)
404 prot_op = SCSI_PROT_WRITE_STRIP;
405 }
406
407 scsi_set_prot_op(scmd, prot_op);
408 scsi_set_prot_type(scmd, dif);
409 }
410
411 /**
412 * sd_prepare_discard - unmap blocks on thinly provisioned device
413 * @rq: Request to prepare
414 *
415 * Will issue either UNMAP or WRITE SAME(16) depending on preference
416 * indicated by target device.
417 **/
418 static int sd_prepare_discard(struct request *rq)
419 {
420 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
421 struct bio *bio = rq->bio;
422 sector_t sector = bio->bi_sector;
423 unsigned int num = bio_sectors(bio);
424
425 if (sdkp->device->sector_size == 4096) {
426 sector >>= 3;
427 num >>= 3;
428 }
429
430 rq->cmd_type = REQ_TYPE_BLOCK_PC;
431 rq->timeout = SD_TIMEOUT;
432
433 memset(rq->cmd, 0, rq->cmd_len);
434
435 if (sdkp->unmap) {
436 char *buf = kmap_atomic(bio_page(bio), KM_USER0);
437
438 rq->cmd[0] = UNMAP;
439 rq->cmd[8] = 24;
440 rq->cmd_len = 10;
441
442 /* Ensure that data length matches payload */
443 rq->__data_len = bio->bi_size = bio->bi_io_vec->bv_len = 24;
444
445 put_unaligned_be16(6 + 16, &buf[0]);
446 put_unaligned_be16(16, &buf[2]);
447 put_unaligned_be64(sector, &buf[8]);
448 put_unaligned_be32(num, &buf[16]);
449
450 kunmap_atomic(buf, KM_USER0);
451 } else {
452 rq->cmd[0] = WRITE_SAME_16;
453 rq->cmd[1] = 0x8; /* UNMAP */
454 put_unaligned_be64(sector, &rq->cmd[2]);
455 put_unaligned_be32(num, &rq->cmd[10]);
456 rq->cmd_len = 16;
457 }
458
459 return BLKPREP_OK;
460 }
461
462 /**
463 * sd_init_command - build a scsi (read or write) command from
464 * information in the request structure.
465 * @SCpnt: pointer to mid-level's per scsi command structure that
466 * contains request and into which the scsi command is written
467 *
468 * Returns 1 if successful and 0 if error (or cannot be done now).
469 **/
470 static int sd_prep_fn(struct request_queue *q, struct request *rq)
471 {
472 struct scsi_cmnd *SCpnt;
473 struct scsi_device *sdp = q->queuedata;
474 struct gendisk *disk = rq->rq_disk;
475 struct scsi_disk *sdkp;
476 sector_t block = blk_rq_pos(rq);
477 sector_t threshold;
478 unsigned int this_count = blk_rq_sectors(rq);
479 int ret, host_dif;
480 unsigned char protect;
481
482 /*
483 * Discard request come in as REQ_TYPE_FS but we turn them into
484 * block PC requests to make life easier.
485 */
486 if (blk_discard_rq(rq))
487 ret = sd_prepare_discard(rq);
488
489 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
490 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
491 goto out;
492 } else if (rq->cmd_type != REQ_TYPE_FS) {
493 ret = BLKPREP_KILL;
494 goto out;
495 }
496 ret = scsi_setup_fs_cmnd(sdp, rq);
497 if (ret != BLKPREP_OK)
498 goto out;
499 SCpnt = rq->special;
500 sdkp = scsi_disk(disk);
501
502 /* from here on until we're complete, any goto out
503 * is used for a killable error condition */
504 ret = BLKPREP_KILL;
505
506 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
507 "sd_init_command: block=%llu, "
508 "count=%d\n",
509 (unsigned long long)block,
510 this_count));
511
512 if (!sdp || !scsi_device_online(sdp) ||
513 block + blk_rq_sectors(rq) > get_capacity(disk)) {
514 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
515 "Finishing %u sectors\n",
516 blk_rq_sectors(rq)));
517 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
518 "Retry with 0x%p\n", SCpnt));
519 goto out;
520 }
521
522 if (sdp->changed) {
523 /*
524 * quietly refuse to do anything to a changed disc until
525 * the changed bit has been reset
526 */
527 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
528 goto out;
529 }
530
531 /*
532 * Some SD card readers can't handle multi-sector accesses which touch
533 * the last one or two hardware sectors. Split accesses as needed.
534 */
535 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
536 (sdp->sector_size / 512);
537
538 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
539 if (block < threshold) {
540 /* Access up to the threshold but not beyond */
541 this_count = threshold - block;
542 } else {
543 /* Access only a single hardware sector */
544 this_count = sdp->sector_size / 512;
545 }
546 }
547
548 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
549 (unsigned long long)block));
550
551 /*
552 * If we have a 1K hardware sectorsize, prevent access to single
553 * 512 byte sectors. In theory we could handle this - in fact
554 * the scsi cdrom driver must be able to handle this because
555 * we typically use 1K blocksizes, and cdroms typically have
556 * 2K hardware sectorsizes. Of course, things are simpler
557 * with the cdrom, since it is read-only. For performance
558 * reasons, the filesystems should be able to handle this
559 * and not force the scsi disk driver to use bounce buffers
560 * for this.
561 */
562 if (sdp->sector_size == 1024) {
563 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
564 scmd_printk(KERN_ERR, SCpnt,
565 "Bad block number requested\n");
566 goto out;
567 } else {
568 block = block >> 1;
569 this_count = this_count >> 1;
570 }
571 }
572 if (sdp->sector_size == 2048) {
573 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
574 scmd_printk(KERN_ERR, SCpnt,
575 "Bad block number requested\n");
576 goto out;
577 } else {
578 block = block >> 2;
579 this_count = this_count >> 2;
580 }
581 }
582 if (sdp->sector_size == 4096) {
583 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
584 scmd_printk(KERN_ERR, SCpnt,
585 "Bad block number requested\n");
586 goto out;
587 } else {
588 block = block >> 3;
589 this_count = this_count >> 3;
590 }
591 }
592 if (rq_data_dir(rq) == WRITE) {
593 if (!sdp->writeable) {
594 goto out;
595 }
596 SCpnt->cmnd[0] = WRITE_6;
597 SCpnt->sc_data_direction = DMA_TO_DEVICE;
598
599 if (blk_integrity_rq(rq) &&
600 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
601 goto out;
602
603 } else if (rq_data_dir(rq) == READ) {
604 SCpnt->cmnd[0] = READ_6;
605 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
606 } else {
607 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
608 goto out;
609 }
610
611 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
612 "%s %d/%u 512 byte blocks.\n",
613 (rq_data_dir(rq) == WRITE) ?
614 "writing" : "reading", this_count,
615 blk_rq_sectors(rq)));
616
617 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
618 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
619 if (host_dif)
620 protect = 1 << 5;
621 else
622 protect = 0;
623
624 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
625 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
626
627 if (unlikely(SCpnt->cmnd == NULL)) {
628 ret = BLKPREP_DEFER;
629 goto out;
630 }
631
632 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
633 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
634 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
635 SCpnt->cmnd[7] = 0x18;
636 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
637 SCpnt->cmnd[10] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
638
639 /* LBA */
640 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
641 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
642 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
643 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
644 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
645 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
646 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
647 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
648
649 /* Expected Indirect LBA */
650 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
651 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
652 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
653 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
654
655 /* Transfer length */
656 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
657 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
658 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
659 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
660 } else if (block > 0xffffffff) {
661 SCpnt->cmnd[0] += READ_16 - READ_6;
662 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
663 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
664 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
665 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
666 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
667 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
668 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
669 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
670 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
671 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
672 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
673 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
674 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
675 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
676 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
677 scsi_device_protection(SCpnt->device) ||
678 SCpnt->device->use_10_for_rw) {
679 if (this_count > 0xffff)
680 this_count = 0xffff;
681
682 SCpnt->cmnd[0] += READ_10 - READ_6;
683 SCpnt->cmnd[1] = protect | (blk_fua_rq(rq) ? 0x8 : 0);
684 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
685 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
686 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
687 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
688 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
689 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
690 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
691 } else {
692 if (unlikely(blk_fua_rq(rq))) {
693 /*
694 * This happens only if this drive failed
695 * 10byte rw command with ILLEGAL_REQUEST
696 * during operation and thus turned off
697 * use_10_for_rw.
698 */
699 scmd_printk(KERN_ERR, SCpnt,
700 "FUA write on READ/WRITE(6) drive\n");
701 goto out;
702 }
703
704 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
705 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
706 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
707 SCpnt->cmnd[4] = (unsigned char) this_count;
708 SCpnt->cmnd[5] = 0;
709 }
710 SCpnt->sdb.length = this_count * sdp->sector_size;
711
712 /* If DIF or DIX is enabled, tell HBA how to handle request */
713 if (host_dif || scsi_prot_sg_count(SCpnt))
714 sd_prot_op(SCpnt, host_dif);
715
716 /*
717 * We shouldn't disconnect in the middle of a sector, so with a dumb
718 * host adapter, it's safe to assume that we can at least transfer
719 * this many bytes between each connect / disconnect.
720 */
721 SCpnt->transfersize = sdp->sector_size;
722 SCpnt->underflow = this_count << 9;
723 SCpnt->allowed = SD_MAX_RETRIES;
724
725 /*
726 * This indicates that the command is ready from our end to be
727 * queued.
728 */
729 ret = BLKPREP_OK;
730 out:
731 return scsi_prep_return(q, rq, ret);
732 }
733
734 /**
735 * sd_open - open a scsi disk device
736 * @inode: only i_rdev member may be used
737 * @filp: only f_mode and f_flags may be used
738 *
739 * Returns 0 if successful. Returns a negated errno value in case
740 * of error.
741 *
742 * Note: This can be called from a user context (e.g. fsck(1) )
743 * or from within the kernel (e.g. as a result of a mount(1) ).
744 * In the latter case @inode and @filp carry an abridged amount
745 * of information as noted above.
746 **/
747 static int sd_open(struct block_device *bdev, fmode_t mode)
748 {
749 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
750 struct scsi_device *sdev;
751 int retval;
752
753 if (!sdkp)
754 return -ENXIO;
755
756 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
757
758 sdev = sdkp->device;
759
760 /*
761 * If the device is in error recovery, wait until it is done.
762 * If the device is offline, then disallow any access to it.
763 */
764 retval = -ENXIO;
765 if (!scsi_block_when_processing_errors(sdev))
766 goto error_out;
767
768 if (sdev->removable || sdkp->write_prot)
769 check_disk_change(bdev);
770
771 /*
772 * If the drive is empty, just let the open fail.
773 */
774 retval = -ENOMEDIUM;
775 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
776 goto error_out;
777
778 /*
779 * If the device has the write protect tab set, have the open fail
780 * if the user expects to be able to write to the thing.
781 */
782 retval = -EROFS;
783 if (sdkp->write_prot && (mode & FMODE_WRITE))
784 goto error_out;
785
786 /*
787 * It is possible that the disk changing stuff resulted in
788 * the device being taken offline. If this is the case,
789 * report this to the user, and don't pretend that the
790 * open actually succeeded.
791 */
792 retval = -ENXIO;
793 if (!scsi_device_online(sdev))
794 goto error_out;
795
796 if (!sdkp->openers++ && sdev->removable) {
797 if (scsi_block_when_processing_errors(sdev))
798 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
799 }
800
801 return 0;
802
803 error_out:
804 scsi_disk_put(sdkp);
805 return retval;
806 }
807
808 /**
809 * sd_release - invoked when the (last) close(2) is called on this
810 * scsi disk.
811 * @inode: only i_rdev member may be used
812 * @filp: only f_mode and f_flags may be used
813 *
814 * Returns 0.
815 *
816 * Note: may block (uninterruptible) if error recovery is underway
817 * on this disk.
818 **/
819 static int sd_release(struct gendisk *disk, fmode_t mode)
820 {
821 struct scsi_disk *sdkp = scsi_disk(disk);
822 struct scsi_device *sdev = sdkp->device;
823
824 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
825
826 if (!--sdkp->openers && sdev->removable) {
827 if (scsi_block_when_processing_errors(sdev))
828 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
829 }
830
831 /*
832 * XXX and what if there are packets in flight and this close()
833 * XXX is followed by a "rmmod sd_mod"?
834 */
835 scsi_disk_put(sdkp);
836 return 0;
837 }
838
839 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
840 {
841 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
842 struct scsi_device *sdp = sdkp->device;
843 struct Scsi_Host *host = sdp->host;
844 int diskinfo[4];
845
846 /* default to most commonly used values */
847 diskinfo[0] = 0x40; /* 1 << 6 */
848 diskinfo[1] = 0x20; /* 1 << 5 */
849 diskinfo[2] = sdkp->capacity >> 11;
850
851 /* override with calculated, extended default, or driver values */
852 if (host->hostt->bios_param)
853 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
854 else
855 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
856
857 geo->heads = diskinfo[0];
858 geo->sectors = diskinfo[1];
859 geo->cylinders = diskinfo[2];
860 return 0;
861 }
862
863 /**
864 * sd_ioctl - process an ioctl
865 * @inode: only i_rdev/i_bdev members may be used
866 * @filp: only f_mode and f_flags may be used
867 * @cmd: ioctl command number
868 * @arg: this is third argument given to ioctl(2) system call.
869 * Often contains a pointer.
870 *
871 * Returns 0 if successful (some ioctls return postive numbers on
872 * success as well). Returns a negated errno value in case of error.
873 *
874 * Note: most ioctls are forward onto the block subsystem or further
875 * down in the scsi subsystem.
876 **/
877 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
878 unsigned int cmd, unsigned long arg)
879 {
880 struct gendisk *disk = bdev->bd_disk;
881 struct scsi_device *sdp = scsi_disk(disk)->device;
882 void __user *p = (void __user *)arg;
883 int error;
884
885 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
886 disk->disk_name, cmd));
887
888 /*
889 * If we are in the middle of error recovery, don't let anyone
890 * else try and use this device. Also, if error recovery fails, it
891 * may try and take the device offline, in which case all further
892 * access to the device is prohibited.
893 */
894 error = scsi_nonblockable_ioctl(sdp, cmd, p,
895 (mode & FMODE_NDELAY) != 0);
896 if (!scsi_block_when_processing_errors(sdp) || !error)
897 return error;
898
899 /*
900 * Send SCSI addressing ioctls directly to mid level, send other
901 * ioctls to block level and then onto mid level if they can't be
902 * resolved.
903 */
904 switch (cmd) {
905 case SCSI_IOCTL_GET_IDLUN:
906 case SCSI_IOCTL_GET_BUS_NUMBER:
907 return scsi_ioctl(sdp, cmd, p);
908 default:
909 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
910 if (error != -ENOTTY)
911 return error;
912 }
913 return scsi_ioctl(sdp, cmd, p);
914 }
915
916 static void set_media_not_present(struct scsi_disk *sdkp)
917 {
918 sdkp->media_present = 0;
919 sdkp->capacity = 0;
920 sdkp->device->changed = 1;
921 }
922
923 /**
924 * sd_media_changed - check if our medium changed
925 * @disk: kernel device descriptor
926 *
927 * Returns 0 if not applicable or no change; 1 if change
928 *
929 * Note: this function is invoked from the block subsystem.
930 **/
931 static int sd_media_changed(struct gendisk *disk)
932 {
933 struct scsi_disk *sdkp = scsi_disk(disk);
934 struct scsi_device *sdp = sdkp->device;
935 struct scsi_sense_hdr *sshdr = NULL;
936 int retval;
937
938 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
939
940 if (!sdp->removable)
941 return 0;
942
943 /*
944 * If the device is offline, don't send any commands - just pretend as
945 * if the command failed. If the device ever comes back online, we
946 * can deal with it then. It is only because of unrecoverable errors
947 * that we would ever take a device offline in the first place.
948 */
949 if (!scsi_device_online(sdp)) {
950 set_media_not_present(sdkp);
951 retval = 1;
952 goto out;
953 }
954
955 /*
956 * Using TEST_UNIT_READY enables differentiation between drive with
957 * no cartridge loaded - NOT READY, drive with changed cartridge -
958 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
959 *
960 * Drives that auto spin down. eg iomega jaz 1G, will be started
961 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
962 * sd_revalidate() is called.
963 */
964 retval = -ENODEV;
965
966 if (scsi_block_when_processing_errors(sdp)) {
967 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
968 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
969 sshdr);
970 }
971
972 /*
973 * Unable to test, unit probably not ready. This usually
974 * means there is no disc in the drive. Mark as changed,
975 * and we will figure it out later once the drive is
976 * available again.
977 */
978 if (retval || (scsi_sense_valid(sshdr) &&
979 /* 0x3a is medium not present */
980 sshdr->asc == 0x3a)) {
981 set_media_not_present(sdkp);
982 retval = 1;
983 goto out;
984 }
985
986 /*
987 * For removable scsi disk we have to recognise the presence
988 * of a disk in the drive. This is kept in the struct scsi_disk
989 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
990 */
991 sdkp->media_present = 1;
992
993 retval = sdp->changed;
994 sdp->changed = 0;
995 out:
996 if (retval != sdkp->previous_state)
997 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
998 sdkp->previous_state = retval;
999 kfree(sshdr);
1000 return retval;
1001 }
1002
1003 static int sd_sync_cache(struct scsi_disk *sdkp)
1004 {
1005 int retries, res;
1006 struct scsi_device *sdp = sdkp->device;
1007 struct scsi_sense_hdr sshdr;
1008
1009 if (!scsi_device_online(sdp))
1010 return -ENODEV;
1011
1012
1013 for (retries = 3; retries > 0; --retries) {
1014 unsigned char cmd[10] = { 0 };
1015
1016 cmd[0] = SYNCHRONIZE_CACHE;
1017 /*
1018 * Leave the rest of the command zero to indicate
1019 * flush everything.
1020 */
1021 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1022 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1023 if (res == 0)
1024 break;
1025 }
1026
1027 if (res) {
1028 sd_print_result(sdkp, res);
1029 if (driver_byte(res) & DRIVER_SENSE)
1030 sd_print_sense_hdr(sdkp, &sshdr);
1031 }
1032
1033 if (res)
1034 return -EIO;
1035 return 0;
1036 }
1037
1038 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
1039 {
1040 rq->cmd_type = REQ_TYPE_BLOCK_PC;
1041 rq->timeout = SD_TIMEOUT;
1042 rq->cmd[0] = SYNCHRONIZE_CACHE;
1043 rq->cmd_len = 10;
1044 }
1045
1046 static void sd_rescan(struct device *dev)
1047 {
1048 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1049
1050 if (sdkp) {
1051 revalidate_disk(sdkp->disk);
1052 scsi_disk_put(sdkp);
1053 }
1054 }
1055
1056
1057 #ifdef CONFIG_COMPAT
1058 /*
1059 * This gets directly called from VFS. When the ioctl
1060 * is not recognized we go back to the other translation paths.
1061 */
1062 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1063 unsigned int cmd, unsigned long arg)
1064 {
1065 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1066
1067 /*
1068 * If we are in the middle of error recovery, don't let anyone
1069 * else try and use this device. Also, if error recovery fails, it
1070 * may try and take the device offline, in which case all further
1071 * access to the device is prohibited.
1072 */
1073 if (!scsi_block_when_processing_errors(sdev))
1074 return -ENODEV;
1075
1076 if (sdev->host->hostt->compat_ioctl) {
1077 int ret;
1078
1079 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1080
1081 return ret;
1082 }
1083
1084 /*
1085 * Let the static ioctl translation table take care of it.
1086 */
1087 return -ENOIOCTLCMD;
1088 }
1089 #endif
1090
1091 static const struct block_device_operations sd_fops = {
1092 .owner = THIS_MODULE,
1093 .open = sd_open,
1094 .release = sd_release,
1095 .locked_ioctl = sd_ioctl,
1096 .getgeo = sd_getgeo,
1097 #ifdef CONFIG_COMPAT
1098 .compat_ioctl = sd_compat_ioctl,
1099 #endif
1100 .media_changed = sd_media_changed,
1101 .revalidate_disk = sd_revalidate_disk,
1102 };
1103
1104 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1105 {
1106 u64 start_lba = blk_rq_pos(scmd->request);
1107 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1108 u64 bad_lba;
1109 int info_valid;
1110
1111 if (!blk_fs_request(scmd->request))
1112 return 0;
1113
1114 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1115 SCSI_SENSE_BUFFERSIZE,
1116 &bad_lba);
1117 if (!info_valid)
1118 return 0;
1119
1120 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1121 return 0;
1122
1123 if (scmd->device->sector_size < 512) {
1124 /* only legitimate sector_size here is 256 */
1125 start_lba <<= 1;
1126 end_lba <<= 1;
1127 } else {
1128 /* be careful ... don't want any overflows */
1129 u64 factor = scmd->device->sector_size / 512;
1130 do_div(start_lba, factor);
1131 do_div(end_lba, factor);
1132 }
1133
1134 /* The bad lba was reported incorrectly, we have no idea where
1135 * the error is.
1136 */
1137 if (bad_lba < start_lba || bad_lba >= end_lba)
1138 return 0;
1139
1140 /* This computation should always be done in terms of
1141 * the resolution of the device's medium.
1142 */
1143 return (bad_lba - start_lba) * scmd->device->sector_size;
1144 }
1145
1146 /**
1147 * sd_done - bottom half handler: called when the lower level
1148 * driver has completed (successfully or otherwise) a scsi command.
1149 * @SCpnt: mid-level's per command structure.
1150 *
1151 * Note: potentially run from within an ISR. Must not block.
1152 **/
1153 static int sd_done(struct scsi_cmnd *SCpnt)
1154 {
1155 int result = SCpnt->result;
1156 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1157 struct scsi_sense_hdr sshdr;
1158 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1159 int sense_valid = 0;
1160 int sense_deferred = 0;
1161
1162 if (result) {
1163 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1164 if (sense_valid)
1165 sense_deferred = scsi_sense_is_deferred(&sshdr);
1166 }
1167 #ifdef CONFIG_SCSI_LOGGING
1168 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1169 if (sense_valid) {
1170 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1171 "sd_done: sb[respc,sk,asc,"
1172 "ascq]=%x,%x,%x,%x\n",
1173 sshdr.response_code,
1174 sshdr.sense_key, sshdr.asc,
1175 sshdr.ascq));
1176 }
1177 #endif
1178 if (driver_byte(result) != DRIVER_SENSE &&
1179 (!sense_valid || sense_deferred))
1180 goto out;
1181
1182 switch (sshdr.sense_key) {
1183 case HARDWARE_ERROR:
1184 case MEDIUM_ERROR:
1185 good_bytes = sd_completed_bytes(SCpnt);
1186 break;
1187 case RECOVERED_ERROR:
1188 good_bytes = scsi_bufflen(SCpnt);
1189 break;
1190 case NO_SENSE:
1191 /* This indicates a false check condition, so ignore it. An
1192 * unknown amount of data was transferred so treat it as an
1193 * error.
1194 */
1195 scsi_print_sense("sd", SCpnt);
1196 SCpnt->result = 0;
1197 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1198 break;
1199 case ABORTED_COMMAND:
1200 if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */
1201 scsi_print_result(SCpnt);
1202 scsi_print_sense("sd", SCpnt);
1203 good_bytes = sd_completed_bytes(SCpnt);
1204 }
1205 break;
1206 case ILLEGAL_REQUEST:
1207 if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */
1208 scsi_print_result(SCpnt);
1209 scsi_print_sense("sd", SCpnt);
1210 good_bytes = sd_completed_bytes(SCpnt);
1211 }
1212 break;
1213 default:
1214 break;
1215 }
1216 out:
1217 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1218 sd_dif_complete(SCpnt, good_bytes);
1219
1220 if (scsi_host_dif_capable(sdkp->device->host, sdkp->protection_type)
1221 == SD_DIF_TYPE2_PROTECTION && SCpnt->cmnd != SCpnt->request->cmd)
1222 mempool_free(SCpnt->cmnd, sd_cdb_pool);
1223
1224 return good_bytes;
1225 }
1226
1227 static int media_not_present(struct scsi_disk *sdkp,
1228 struct scsi_sense_hdr *sshdr)
1229 {
1230
1231 if (!scsi_sense_valid(sshdr))
1232 return 0;
1233 /* not invoked for commands that could return deferred errors */
1234 if (sshdr->sense_key != NOT_READY &&
1235 sshdr->sense_key != UNIT_ATTENTION)
1236 return 0;
1237 if (sshdr->asc != 0x3A) /* medium not present */
1238 return 0;
1239
1240 set_media_not_present(sdkp);
1241 return 1;
1242 }
1243
1244 /*
1245 * spinup disk - called only in sd_revalidate_disk()
1246 */
1247 static void
1248 sd_spinup_disk(struct scsi_disk *sdkp)
1249 {
1250 unsigned char cmd[10];
1251 unsigned long spintime_expire = 0;
1252 int retries, spintime;
1253 unsigned int the_result;
1254 struct scsi_sense_hdr sshdr;
1255 int sense_valid = 0;
1256
1257 spintime = 0;
1258
1259 /* Spin up drives, as required. Only do this at boot time */
1260 /* Spinup needs to be done for module loads too. */
1261 do {
1262 retries = 0;
1263
1264 do {
1265 cmd[0] = TEST_UNIT_READY;
1266 memset((void *) &cmd[1], 0, 9);
1267
1268 the_result = scsi_execute_req(sdkp->device, cmd,
1269 DMA_NONE, NULL, 0,
1270 &sshdr, SD_TIMEOUT,
1271 SD_MAX_RETRIES, NULL);
1272
1273 /*
1274 * If the drive has indicated to us that it
1275 * doesn't have any media in it, don't bother
1276 * with any more polling.
1277 */
1278 if (media_not_present(sdkp, &sshdr))
1279 return;
1280
1281 if (the_result)
1282 sense_valid = scsi_sense_valid(&sshdr);
1283 retries++;
1284 } while (retries < 3 &&
1285 (!scsi_status_is_good(the_result) ||
1286 ((driver_byte(the_result) & DRIVER_SENSE) &&
1287 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1288
1289 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1290 /* no sense, TUR either succeeded or failed
1291 * with a status error */
1292 if(!spintime && !scsi_status_is_good(the_result)) {
1293 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1294 sd_print_result(sdkp, the_result);
1295 }
1296 break;
1297 }
1298
1299 /*
1300 * The device does not want the automatic start to be issued.
1301 */
1302 if (sdkp->device->no_start_on_add)
1303 break;
1304
1305 if (sense_valid && sshdr.sense_key == NOT_READY) {
1306 if (sshdr.asc == 4 && sshdr.ascq == 3)
1307 break; /* manual intervention required */
1308 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1309 break; /* standby */
1310 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1311 break; /* unavailable */
1312 /*
1313 * Issue command to spin up drive when not ready
1314 */
1315 if (!spintime) {
1316 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1317 cmd[0] = START_STOP;
1318 cmd[1] = 1; /* Return immediately */
1319 memset((void *) &cmd[2], 0, 8);
1320 cmd[4] = 1; /* Start spin cycle */
1321 if (sdkp->device->start_stop_pwr_cond)
1322 cmd[4] |= 1 << 4;
1323 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1324 NULL, 0, &sshdr,
1325 SD_TIMEOUT, SD_MAX_RETRIES,
1326 NULL);
1327 spintime_expire = jiffies + 100 * HZ;
1328 spintime = 1;
1329 }
1330 /* Wait 1 second for next try */
1331 msleep(1000);
1332 printk(".");
1333
1334 /*
1335 * Wait for USB flash devices with slow firmware.
1336 * Yes, this sense key/ASC combination shouldn't
1337 * occur here. It's characteristic of these devices.
1338 */
1339 } else if (sense_valid &&
1340 sshdr.sense_key == UNIT_ATTENTION &&
1341 sshdr.asc == 0x28) {
1342 if (!spintime) {
1343 spintime_expire = jiffies + 5 * HZ;
1344 spintime = 1;
1345 }
1346 /* Wait 1 second for next try */
1347 msleep(1000);
1348 } else {
1349 /* we don't understand the sense code, so it's
1350 * probably pointless to loop */
1351 if(!spintime) {
1352 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1353 sd_print_sense_hdr(sdkp, &sshdr);
1354 }
1355 break;
1356 }
1357
1358 } while (spintime && time_before_eq(jiffies, spintime_expire));
1359
1360 if (spintime) {
1361 if (scsi_status_is_good(the_result))
1362 printk("ready\n");
1363 else
1364 printk("not responding...\n");
1365 }
1366 }
1367
1368
1369 /*
1370 * Determine whether disk supports Data Integrity Field.
1371 */
1372 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1373 {
1374 struct scsi_device *sdp = sdkp->device;
1375 u8 type;
1376
1377 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1378 return;
1379
1380 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1381
1382 if (type == sdkp->protection_type || !sdkp->first_scan)
1383 return;
1384
1385 sdkp->protection_type = type;
1386
1387 if (type > SD_DIF_TYPE3_PROTECTION) {
1388 sd_printk(KERN_ERR, sdkp, "formatted with unsupported " \
1389 "protection type %u. Disabling disk!\n", type);
1390 sdkp->capacity = 0;
1391 return;
1392 }
1393
1394 if (scsi_host_dif_capable(sdp->host, type))
1395 sd_printk(KERN_NOTICE, sdkp,
1396 "Enabling DIF Type %u protection\n", type);
1397 else
1398 sd_printk(KERN_NOTICE, sdkp,
1399 "Disabling DIF Type %u protection\n", type);
1400 }
1401
1402 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1403 struct scsi_sense_hdr *sshdr, int sense_valid,
1404 int the_result)
1405 {
1406 sd_print_result(sdkp, the_result);
1407 if (driver_byte(the_result) & DRIVER_SENSE)
1408 sd_print_sense_hdr(sdkp, sshdr);
1409 else
1410 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1411
1412 /*
1413 * Set dirty bit for removable devices if not ready -
1414 * sometimes drives will not report this properly.
1415 */
1416 if (sdp->removable &&
1417 sense_valid && sshdr->sense_key == NOT_READY)
1418 sdp->changed = 1;
1419
1420 /*
1421 * We used to set media_present to 0 here to indicate no media
1422 * in the drive, but some drives fail read capacity even with
1423 * media present, so we can't do that.
1424 */
1425 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1426 }
1427
1428 #define RC16_LEN 32
1429 #if RC16_LEN > SD_BUF_SIZE
1430 #error RC16_LEN must not be more than SD_BUF_SIZE
1431 #endif
1432
1433 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1434 unsigned char *buffer)
1435 {
1436 unsigned char cmd[16];
1437 struct scsi_sense_hdr sshdr;
1438 int sense_valid = 0;
1439 int the_result;
1440 int retries = 3;
1441 unsigned int alignment;
1442 unsigned long long lba;
1443 unsigned sector_size;
1444
1445 do {
1446 memset(cmd, 0, 16);
1447 cmd[0] = SERVICE_ACTION_IN;
1448 cmd[1] = SAI_READ_CAPACITY_16;
1449 cmd[13] = RC16_LEN;
1450 memset(buffer, 0, RC16_LEN);
1451
1452 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1453 buffer, RC16_LEN, &sshdr,
1454 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1455
1456 if (media_not_present(sdkp, &sshdr))
1457 return -ENODEV;
1458
1459 if (the_result) {
1460 sense_valid = scsi_sense_valid(&sshdr);
1461 if (sense_valid &&
1462 sshdr.sense_key == ILLEGAL_REQUEST &&
1463 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1464 sshdr.ascq == 0x00)
1465 /* Invalid Command Operation Code or
1466 * Invalid Field in CDB, just retry
1467 * silently with RC10 */
1468 return -EINVAL;
1469 }
1470 retries--;
1471
1472 } while (the_result && retries);
1473
1474 if (the_result) {
1475 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1476 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1477 return -EINVAL;
1478 }
1479
1480 sector_size = get_unaligned_be32(&buffer[8]);
1481 lba = get_unaligned_be64(&buffer[0]);
1482
1483 sd_read_protection_type(sdkp, buffer);
1484
1485 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1486 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1487 "kernel compiled with support for large block "
1488 "devices.\n");
1489 sdkp->capacity = 0;
1490 return -EOVERFLOW;
1491 }
1492
1493 /* Logical blocks per physical block exponent */
1494 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
1495
1496 /* Lowest aligned logical block */
1497 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1498 blk_queue_alignment_offset(sdp->request_queue, alignment);
1499 if (alignment && sdkp->first_scan)
1500 sd_printk(KERN_NOTICE, sdkp,
1501 "physical block alignment offset: %u\n", alignment);
1502
1503 if (buffer[14] & 0x80) { /* TPE */
1504 struct request_queue *q = sdp->request_queue;
1505
1506 sdkp->thin_provisioning = 1;
1507 q->limits.discard_granularity = sdkp->hw_sector_size;
1508 q->limits.max_discard_sectors = 0xffffffff;
1509
1510 if (buffer[14] & 0x40) /* TPRZ */
1511 q->limits.discard_zeroes_data = 1;
1512
1513 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
1514 }
1515
1516 sdkp->capacity = lba + 1;
1517 return sector_size;
1518 }
1519
1520 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1521 unsigned char *buffer)
1522 {
1523 unsigned char cmd[16];
1524 struct scsi_sense_hdr sshdr;
1525 int sense_valid = 0;
1526 int the_result;
1527 int retries = 3;
1528 sector_t lba;
1529 unsigned sector_size;
1530
1531 do {
1532 cmd[0] = READ_CAPACITY;
1533 memset(&cmd[1], 0, 9);
1534 memset(buffer, 0, 8);
1535
1536 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1537 buffer, 8, &sshdr,
1538 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1539
1540 if (media_not_present(sdkp, &sshdr))
1541 return -ENODEV;
1542
1543 if (the_result)
1544 sense_valid = scsi_sense_valid(&sshdr);
1545 retries--;
1546
1547 } while (the_result && retries);
1548
1549 if (the_result) {
1550 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1551 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1552 return -EINVAL;
1553 }
1554
1555 sector_size = get_unaligned_be32(&buffer[4]);
1556 lba = get_unaligned_be32(&buffer[0]);
1557
1558 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1559 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1560 "kernel compiled with support for large block "
1561 "devices.\n");
1562 sdkp->capacity = 0;
1563 return -EOVERFLOW;
1564 }
1565
1566 sdkp->capacity = lba + 1;
1567 sdkp->hw_sector_size = sector_size;
1568 return sector_size;
1569 }
1570
1571 static int sd_try_rc16_first(struct scsi_device *sdp)
1572 {
1573 if (sdp->scsi_level > SCSI_SPC_2)
1574 return 1;
1575 if (scsi_device_protection(sdp))
1576 return 1;
1577 return 0;
1578 }
1579
1580 /*
1581 * read disk capacity
1582 */
1583 static void
1584 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1585 {
1586 int sector_size;
1587 struct scsi_device *sdp = sdkp->device;
1588 sector_t old_capacity = sdkp->capacity;
1589
1590 if (sd_try_rc16_first(sdp)) {
1591 sector_size = read_capacity_16(sdkp, sdp, buffer);
1592 if (sector_size == -EOVERFLOW)
1593 goto got_data;
1594 if (sector_size == -ENODEV)
1595 return;
1596 if (sector_size < 0)
1597 sector_size = read_capacity_10(sdkp, sdp, buffer);
1598 if (sector_size < 0)
1599 return;
1600 } else {
1601 sector_size = read_capacity_10(sdkp, sdp, buffer);
1602 if (sector_size == -EOVERFLOW)
1603 goto got_data;
1604 if (sector_size < 0)
1605 return;
1606 if ((sizeof(sdkp->capacity) > 4) &&
1607 (sdkp->capacity > 0xffffffffULL)) {
1608 int old_sector_size = sector_size;
1609 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1610 "Trying to use READ CAPACITY(16).\n");
1611 sector_size = read_capacity_16(sdkp, sdp, buffer);
1612 if (sector_size < 0) {
1613 sd_printk(KERN_NOTICE, sdkp,
1614 "Using 0xffffffff as device size\n");
1615 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1616 sector_size = old_sector_size;
1617 goto got_data;
1618 }
1619 }
1620 }
1621
1622 /* Some devices are known to return the total number of blocks,
1623 * not the highest block number. Some devices have versions
1624 * which do this and others which do not. Some devices we might
1625 * suspect of doing this but we don't know for certain.
1626 *
1627 * If we know the reported capacity is wrong, decrement it. If
1628 * we can only guess, then assume the number of blocks is even
1629 * (usually true but not always) and err on the side of lowering
1630 * the capacity.
1631 */
1632 if (sdp->fix_capacity ||
1633 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1634 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1635 "from its reported value: %llu\n",
1636 (unsigned long long) sdkp->capacity);
1637 --sdkp->capacity;
1638 }
1639
1640 got_data:
1641 if (sector_size == 0) {
1642 sector_size = 512;
1643 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1644 "assuming 512.\n");
1645 }
1646
1647 if (sector_size != 512 &&
1648 sector_size != 1024 &&
1649 sector_size != 2048 &&
1650 sector_size != 4096 &&
1651 sector_size != 256) {
1652 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1653 sector_size);
1654 /*
1655 * The user might want to re-format the drive with
1656 * a supported sectorsize. Once this happens, it
1657 * would be relatively trivial to set the thing up.
1658 * For this reason, we leave the thing in the table.
1659 */
1660 sdkp->capacity = 0;
1661 /*
1662 * set a bogus sector size so the normal read/write
1663 * logic in the block layer will eventually refuse any
1664 * request on this device without tripping over power
1665 * of two sector size assumptions
1666 */
1667 sector_size = 512;
1668 }
1669 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1670
1671 {
1672 char cap_str_2[10], cap_str_10[10];
1673 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1674
1675 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1676 sizeof(cap_str_2));
1677 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1678 sizeof(cap_str_10));
1679
1680 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1681 sd_printk(KERN_NOTICE, sdkp,
1682 "%llu %d-byte logical blocks: (%s/%s)\n",
1683 (unsigned long long)sdkp->capacity,
1684 sector_size, cap_str_10, cap_str_2);
1685
1686 if (sdkp->hw_sector_size != sector_size)
1687 sd_printk(KERN_NOTICE, sdkp,
1688 "%u-byte physical blocks\n",
1689 sdkp->hw_sector_size);
1690 }
1691 }
1692
1693 /* Rescale capacity to 512-byte units */
1694 if (sector_size == 4096)
1695 sdkp->capacity <<= 3;
1696 else if (sector_size == 2048)
1697 sdkp->capacity <<= 2;
1698 else if (sector_size == 1024)
1699 sdkp->capacity <<= 1;
1700 else if (sector_size == 256)
1701 sdkp->capacity >>= 1;
1702
1703 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
1704 sdkp->device->sector_size = sector_size;
1705 }
1706
1707 /* called with buffer of length 512 */
1708 static inline int
1709 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1710 unsigned char *buffer, int len, struct scsi_mode_data *data,
1711 struct scsi_sense_hdr *sshdr)
1712 {
1713 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1714 SD_TIMEOUT, SD_MAX_RETRIES, data,
1715 sshdr);
1716 }
1717
1718 /*
1719 * read write protect setting, if possible - called only in sd_revalidate_disk()
1720 * called with buffer of length SD_BUF_SIZE
1721 */
1722 static void
1723 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1724 {
1725 int res;
1726 struct scsi_device *sdp = sdkp->device;
1727 struct scsi_mode_data data;
1728 int old_wp = sdkp->write_prot;
1729
1730 set_disk_ro(sdkp->disk, 0);
1731 if (sdp->skip_ms_page_3f) {
1732 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1733 return;
1734 }
1735
1736 if (sdp->use_192_bytes_for_3f) {
1737 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1738 } else {
1739 /*
1740 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1741 * We have to start carefully: some devices hang if we ask
1742 * for more than is available.
1743 */
1744 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1745
1746 /*
1747 * Second attempt: ask for page 0 When only page 0 is
1748 * implemented, a request for page 3F may return Sense Key
1749 * 5: Illegal Request, Sense Code 24: Invalid field in
1750 * CDB.
1751 */
1752 if (!scsi_status_is_good(res))
1753 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1754
1755 /*
1756 * Third attempt: ask 255 bytes, as we did earlier.
1757 */
1758 if (!scsi_status_is_good(res))
1759 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1760 &data, NULL);
1761 }
1762
1763 if (!scsi_status_is_good(res)) {
1764 sd_printk(KERN_WARNING, sdkp,
1765 "Test WP failed, assume Write Enabled\n");
1766 } else {
1767 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1768 set_disk_ro(sdkp->disk, sdkp->write_prot);
1769 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1770 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1771 sdkp->write_prot ? "on" : "off");
1772 sd_printk(KERN_DEBUG, sdkp,
1773 "Mode Sense: %02x %02x %02x %02x\n",
1774 buffer[0], buffer[1], buffer[2], buffer[3]);
1775 }
1776 }
1777 }
1778
1779 /*
1780 * sd_read_cache_type - called only from sd_revalidate_disk()
1781 * called with buffer of length SD_BUF_SIZE
1782 */
1783 static void
1784 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1785 {
1786 int len = 0, res;
1787 struct scsi_device *sdp = sdkp->device;
1788
1789 int dbd;
1790 int modepage;
1791 struct scsi_mode_data data;
1792 struct scsi_sense_hdr sshdr;
1793 int old_wce = sdkp->WCE;
1794 int old_rcd = sdkp->RCD;
1795 int old_dpofua = sdkp->DPOFUA;
1796
1797 if (sdp->skip_ms_page_8)
1798 goto defaults;
1799
1800 if (sdp->type == TYPE_RBC) {
1801 modepage = 6;
1802 dbd = 8;
1803 } else {
1804 modepage = 8;
1805 dbd = 0;
1806 }
1807
1808 /* cautiously ask */
1809 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1810
1811 if (!scsi_status_is_good(res))
1812 goto bad_sense;
1813
1814 if (!data.header_length) {
1815 modepage = 6;
1816 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1817 }
1818
1819 /* that went OK, now ask for the proper length */
1820 len = data.length;
1821
1822 /*
1823 * We're only interested in the first three bytes, actually.
1824 * But the data cache page is defined for the first 20.
1825 */
1826 if (len < 3)
1827 goto bad_sense;
1828 if (len > 20)
1829 len = 20;
1830
1831 /* Take headers and block descriptors into account */
1832 len += data.header_length + data.block_descriptor_length;
1833 if (len > SD_BUF_SIZE)
1834 goto bad_sense;
1835
1836 /* Get the data */
1837 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1838
1839 if (scsi_status_is_good(res)) {
1840 int offset = data.header_length + data.block_descriptor_length;
1841
1842 if (offset >= SD_BUF_SIZE - 2) {
1843 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1844 goto defaults;
1845 }
1846
1847 if ((buffer[offset] & 0x3f) != modepage) {
1848 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1849 goto defaults;
1850 }
1851
1852 if (modepage == 8) {
1853 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1854 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1855 } else {
1856 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1857 sdkp->RCD = 0;
1858 }
1859
1860 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1861 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1862 sd_printk(KERN_NOTICE, sdkp,
1863 "Uses READ/WRITE(6), disabling FUA\n");
1864 sdkp->DPOFUA = 0;
1865 }
1866
1867 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1868 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1869 sd_printk(KERN_NOTICE, sdkp,
1870 "Write cache: %s, read cache: %s, %s\n",
1871 sdkp->WCE ? "enabled" : "disabled",
1872 sdkp->RCD ? "disabled" : "enabled",
1873 sdkp->DPOFUA ? "supports DPO and FUA"
1874 : "doesn't support DPO or FUA");
1875
1876 return;
1877 }
1878
1879 bad_sense:
1880 if (scsi_sense_valid(&sshdr) &&
1881 sshdr.sense_key == ILLEGAL_REQUEST &&
1882 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1883 /* Invalid field in CDB */
1884 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1885 else
1886 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1887
1888 defaults:
1889 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1890 sdkp->WCE = 0;
1891 sdkp->RCD = 0;
1892 sdkp->DPOFUA = 0;
1893 }
1894
1895 /*
1896 * The ATO bit indicates whether the DIF application tag is available
1897 * for use by the operating system.
1898 */
1899 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1900 {
1901 int res, offset;
1902 struct scsi_device *sdp = sdkp->device;
1903 struct scsi_mode_data data;
1904 struct scsi_sense_hdr sshdr;
1905
1906 if (sdp->type != TYPE_DISK)
1907 return;
1908
1909 if (sdkp->protection_type == 0)
1910 return;
1911
1912 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1913 SD_MAX_RETRIES, &data, &sshdr);
1914
1915 if (!scsi_status_is_good(res) || !data.header_length ||
1916 data.length < 6) {
1917 sd_printk(KERN_WARNING, sdkp,
1918 "getting Control mode page failed, assume no ATO\n");
1919
1920 if (scsi_sense_valid(&sshdr))
1921 sd_print_sense_hdr(sdkp, &sshdr);
1922
1923 return;
1924 }
1925
1926 offset = data.header_length + data.block_descriptor_length;
1927
1928 if ((buffer[offset] & 0x3f) != 0x0a) {
1929 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1930 return;
1931 }
1932
1933 if ((buffer[offset + 5] & 0x80) == 0)
1934 return;
1935
1936 sdkp->ATO = 1;
1937
1938 return;
1939 }
1940
1941 /**
1942 * sd_read_block_limits - Query disk device for preferred I/O sizes.
1943 * @disk: disk to query
1944 */
1945 static void sd_read_block_limits(struct scsi_disk *sdkp)
1946 {
1947 struct request_queue *q = sdkp->disk->queue;
1948 unsigned int sector_sz = sdkp->device->sector_size;
1949 char *buffer;
1950
1951 /* Block Limits VPD */
1952 buffer = scsi_get_vpd_page(sdkp->device, 0xb0);
1953
1954 if (buffer == NULL)
1955 return;
1956
1957 blk_queue_io_min(sdkp->disk->queue,
1958 get_unaligned_be16(&buffer[6]) * sector_sz);
1959 blk_queue_io_opt(sdkp->disk->queue,
1960 get_unaligned_be32(&buffer[12]) * sector_sz);
1961
1962 /* Thin provisioning enabled and page length indicates TP support */
1963 if (sdkp->thin_provisioning && buffer[3] == 0x3c) {
1964 unsigned int lba_count, desc_count, granularity;
1965
1966 lba_count = get_unaligned_be32(&buffer[20]);
1967 desc_count = get_unaligned_be32(&buffer[24]);
1968
1969 if (lba_count) {
1970 q->limits.max_discard_sectors =
1971 lba_count * sector_sz >> 9;
1972
1973 if (desc_count)
1974 sdkp->unmap = 1;
1975 }
1976
1977 granularity = get_unaligned_be32(&buffer[28]);
1978
1979 if (granularity)
1980 q->limits.discard_granularity = granularity * sector_sz;
1981
1982 if (buffer[32] & 0x80)
1983 q->limits.discard_alignment =
1984 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
1985 }
1986
1987 kfree(buffer);
1988 }
1989
1990 /**
1991 * sd_read_block_characteristics - Query block dev. characteristics
1992 * @disk: disk to query
1993 */
1994 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
1995 {
1996 char *buffer;
1997 u16 rot;
1998
1999 /* Block Device Characteristics VPD */
2000 buffer = scsi_get_vpd_page(sdkp->device, 0xb1);
2001
2002 if (buffer == NULL)
2003 return;
2004
2005 rot = get_unaligned_be16(&buffer[4]);
2006
2007 if (rot == 1)
2008 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2009
2010 kfree(buffer);
2011 }
2012
2013 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2014 {
2015 /*
2016 * Although VPD inquiries can go to SCSI-2 type devices,
2017 * some USB ones crash on receiving them, and the pages
2018 * we currently ask for are for SPC-3 and beyond
2019 */
2020 if (sdp->scsi_level > SCSI_SPC_2)
2021 return 1;
2022 return 0;
2023 }
2024
2025 /**
2026 * sd_revalidate_disk - called the first time a new disk is seen,
2027 * performs disk spin up, read_capacity, etc.
2028 * @disk: struct gendisk we care about
2029 **/
2030 static int sd_revalidate_disk(struct gendisk *disk)
2031 {
2032 struct scsi_disk *sdkp = scsi_disk(disk);
2033 struct scsi_device *sdp = sdkp->device;
2034 unsigned char *buffer;
2035 unsigned ordered;
2036
2037 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2038 "sd_revalidate_disk\n"));
2039
2040 /*
2041 * If the device is offline, don't try and read capacity or any
2042 * of the other niceties.
2043 */
2044 if (!scsi_device_online(sdp))
2045 goto out;
2046
2047 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2048 if (!buffer) {
2049 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2050 "allocation failure.\n");
2051 goto out;
2052 }
2053
2054 sd_spinup_disk(sdkp);
2055
2056 /*
2057 * Without media there is no reason to ask; moreover, some devices
2058 * react badly if we do.
2059 */
2060 if (sdkp->media_present) {
2061 sd_read_capacity(sdkp, buffer);
2062
2063 if (sd_try_extended_inquiry(sdp)) {
2064 sd_read_block_limits(sdkp);
2065 sd_read_block_characteristics(sdkp);
2066 }
2067
2068 sd_read_write_protect_flag(sdkp, buffer);
2069 sd_read_cache_type(sdkp, buffer);
2070 sd_read_app_tag_own(sdkp, buffer);
2071 }
2072
2073 sdkp->first_scan = 0;
2074
2075 /*
2076 * We now have all cache related info, determine how we deal
2077 * with ordered requests. Note that as the current SCSI
2078 * dispatch function can alter request order, we cannot use
2079 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
2080 */
2081 if (sdkp->WCE)
2082 ordered = sdkp->DPOFUA
2083 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
2084 else
2085 ordered = QUEUE_ORDERED_DRAIN;
2086
2087 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
2088
2089 set_capacity(disk, sdkp->capacity);
2090 kfree(buffer);
2091
2092 out:
2093 return 0;
2094 }
2095
2096 /**
2097 * sd_format_disk_name - format disk name
2098 * @prefix: name prefix - ie. "sd" for SCSI disks
2099 * @index: index of the disk to format name for
2100 * @buf: output buffer
2101 * @buflen: length of the output buffer
2102 *
2103 * SCSI disk names starts at sda. The 26th device is sdz and the
2104 * 27th is sdaa. The last one for two lettered suffix is sdzz
2105 * which is followed by sdaaa.
2106 *
2107 * This is basically 26 base counting with one extra 'nil' entry
2108 * at the beggining from the second digit on and can be
2109 * determined using similar method as 26 base conversion with the
2110 * index shifted -1 after each digit is computed.
2111 *
2112 * CONTEXT:
2113 * Don't care.
2114 *
2115 * RETURNS:
2116 * 0 on success, -errno on failure.
2117 */
2118 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2119 {
2120 const int base = 'z' - 'a' + 1;
2121 char *begin = buf + strlen(prefix);
2122 char *end = buf + buflen;
2123 char *p;
2124 int unit;
2125
2126 p = end - 1;
2127 *p = '\0';
2128 unit = base;
2129 do {
2130 if (p == begin)
2131 return -EINVAL;
2132 *--p = 'a' + (index % unit);
2133 index = (index / unit) - 1;
2134 } while (index >= 0);
2135
2136 memmove(begin, p, end - p);
2137 memcpy(buf, prefix, strlen(prefix));
2138
2139 return 0;
2140 }
2141
2142 /*
2143 * The asynchronous part of sd_probe
2144 */
2145 static void sd_probe_async(void *data, async_cookie_t cookie)
2146 {
2147 struct scsi_disk *sdkp = data;
2148 struct scsi_device *sdp;
2149 struct gendisk *gd;
2150 u32 index;
2151 struct device *dev;
2152
2153 sdp = sdkp->device;
2154 gd = sdkp->disk;
2155 index = sdkp->index;
2156 dev = &sdp->sdev_gendev;
2157
2158 if (index < SD_MAX_DISKS) {
2159 gd->major = sd_major((index & 0xf0) >> 4);
2160 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2161 gd->minors = SD_MINORS;
2162 }
2163 gd->fops = &sd_fops;
2164 gd->private_data = &sdkp->driver;
2165 gd->queue = sdkp->device->request_queue;
2166
2167 /* defaults, until the device tells us otherwise */
2168 sdp->sector_size = 512;
2169 sdkp->capacity = 0;
2170 sdkp->media_present = 1;
2171 sdkp->write_prot = 0;
2172 sdkp->WCE = 0;
2173 sdkp->RCD = 0;
2174 sdkp->ATO = 0;
2175 sdkp->first_scan = 1;
2176
2177 sd_revalidate_disk(gd);
2178
2179 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2180
2181 gd->driverfs_dev = &sdp->sdev_gendev;
2182 gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;
2183 if (sdp->removable)
2184 gd->flags |= GENHD_FL_REMOVABLE;
2185
2186 dev_set_drvdata(dev, sdkp);
2187 add_disk(gd);
2188 sd_dif_config_host(sdkp);
2189
2190 sd_revalidate_disk(gd);
2191
2192 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2193 sdp->removable ? "removable " : "");
2194 put_device(&sdkp->dev);
2195 }
2196
2197 /**
2198 * sd_probe - called during driver initialization and whenever a
2199 * new scsi device is attached to the system. It is called once
2200 * for each scsi device (not just disks) present.
2201 * @dev: pointer to device object
2202 *
2203 * Returns 0 if successful (or not interested in this scsi device
2204 * (e.g. scanner)); 1 when there is an error.
2205 *
2206 * Note: this function is invoked from the scsi mid-level.
2207 * This function sets up the mapping between a given
2208 * <host,channel,id,lun> (found in sdp) and new device name
2209 * (e.g. /dev/sda). More precisely it is the block device major
2210 * and minor number that is chosen here.
2211 *
2212 * Assume sd_attach is not re-entrant (for time being)
2213 * Also think about sd_attach() and sd_remove() running coincidentally.
2214 **/
2215 static int sd_probe(struct device *dev)
2216 {
2217 struct scsi_device *sdp = to_scsi_device(dev);
2218 struct scsi_disk *sdkp;
2219 struct gendisk *gd;
2220 u32 index;
2221 int error;
2222
2223 error = -ENODEV;
2224 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2225 goto out;
2226
2227 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2228 "sd_attach\n"));
2229
2230 error = -ENOMEM;
2231 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2232 if (!sdkp)
2233 goto out;
2234
2235 gd = alloc_disk(SD_MINORS);
2236 if (!gd)
2237 goto out_free;
2238
2239 do {
2240 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2241 goto out_put;
2242
2243 spin_lock(&sd_index_lock);
2244 error = ida_get_new(&sd_index_ida, &index);
2245 spin_unlock(&sd_index_lock);
2246 } while (error == -EAGAIN);
2247
2248 if (error)
2249 goto out_put;
2250
2251 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2252 if (error)
2253 goto out_free_index;
2254
2255 sdkp->device = sdp;
2256 sdkp->driver = &sd_template;
2257 sdkp->disk = gd;
2258 sdkp->index = index;
2259 sdkp->openers = 0;
2260 sdkp->previous_state = 1;
2261
2262 if (!sdp->request_queue->rq_timeout) {
2263 if (sdp->type != TYPE_MOD)
2264 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2265 else
2266 blk_queue_rq_timeout(sdp->request_queue,
2267 SD_MOD_TIMEOUT);
2268 }
2269
2270 device_initialize(&sdkp->dev);
2271 sdkp->dev.parent = &sdp->sdev_gendev;
2272 sdkp->dev.class = &sd_disk_class;
2273 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
2274
2275 if (device_add(&sdkp->dev))
2276 goto out_free_index;
2277
2278 get_device(&sdp->sdev_gendev);
2279
2280 get_device(&sdkp->dev); /* prevent release before async_schedule */
2281 async_schedule(sd_probe_async, sdkp);
2282
2283 return 0;
2284
2285 out_free_index:
2286 spin_lock(&sd_index_lock);
2287 ida_remove(&sd_index_ida, index);
2288 spin_unlock(&sd_index_lock);
2289 out_put:
2290 put_disk(gd);
2291 out_free:
2292 kfree(sdkp);
2293 out:
2294 return error;
2295 }
2296
2297 /**
2298 * sd_remove - called whenever a scsi disk (previously recognized by
2299 * sd_probe) is detached from the system. It is called (potentially
2300 * multiple times) during sd module unload.
2301 * @sdp: pointer to mid level scsi device object
2302 *
2303 * Note: this function is invoked from the scsi mid-level.
2304 * This function potentially frees up a device name (e.g. /dev/sdc)
2305 * that could be re-used by a subsequent sd_probe().
2306 * This function is not called when the built-in sd driver is "exit-ed".
2307 **/
2308 static int sd_remove(struct device *dev)
2309 {
2310 struct scsi_disk *sdkp;
2311
2312 async_synchronize_full();
2313 sdkp = dev_get_drvdata(dev);
2314 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2315 device_del(&sdkp->dev);
2316 del_gendisk(sdkp->disk);
2317 sd_shutdown(dev);
2318
2319 mutex_lock(&sd_ref_mutex);
2320 dev_set_drvdata(dev, NULL);
2321 put_device(&sdkp->dev);
2322 mutex_unlock(&sd_ref_mutex);
2323
2324 return 0;
2325 }
2326
2327 /**
2328 * scsi_disk_release - Called to free the scsi_disk structure
2329 * @dev: pointer to embedded class device
2330 *
2331 * sd_ref_mutex must be held entering this routine. Because it is
2332 * called on last put, you should always use the scsi_disk_get()
2333 * scsi_disk_put() helpers which manipulate the semaphore directly
2334 * and never do a direct put_device.
2335 **/
2336 static void scsi_disk_release(struct device *dev)
2337 {
2338 struct scsi_disk *sdkp = to_scsi_disk(dev);
2339 struct gendisk *disk = sdkp->disk;
2340
2341 spin_lock(&sd_index_lock);
2342 ida_remove(&sd_index_ida, sdkp->index);
2343 spin_unlock(&sd_index_lock);
2344
2345 disk->private_data = NULL;
2346 put_disk(disk);
2347 put_device(&sdkp->device->sdev_gendev);
2348
2349 kfree(sdkp);
2350 }
2351
2352 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2353 {
2354 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2355 struct scsi_sense_hdr sshdr;
2356 struct scsi_device *sdp = sdkp->device;
2357 int res;
2358
2359 if (start)
2360 cmd[4] |= 1; /* START */
2361
2362 if (sdp->start_stop_pwr_cond)
2363 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2364
2365 if (!scsi_device_online(sdp))
2366 return -ENODEV;
2367
2368 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2369 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2370 if (res) {
2371 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2372 sd_print_result(sdkp, res);
2373 if (driver_byte(res) & DRIVER_SENSE)
2374 sd_print_sense_hdr(sdkp, &sshdr);
2375 }
2376
2377 return res;
2378 }
2379
2380 /*
2381 * Send a SYNCHRONIZE CACHE instruction down to the device through
2382 * the normal SCSI command structure. Wait for the command to
2383 * complete.
2384 */
2385 static void sd_shutdown(struct device *dev)
2386 {
2387 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2388
2389 if (!sdkp)
2390 return; /* this can happen */
2391
2392 if (sdkp->WCE) {
2393 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2394 sd_sync_cache(sdkp);
2395 }
2396
2397 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2398 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2399 sd_start_stop_device(sdkp, 0);
2400 }
2401
2402 scsi_disk_put(sdkp);
2403 }
2404
2405 static int sd_suspend(struct device *dev, pm_message_t mesg)
2406 {
2407 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2408 int ret = 0;
2409
2410 if (!sdkp)
2411 return 0; /* this can happen */
2412
2413 if (sdkp->WCE) {
2414 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2415 ret = sd_sync_cache(sdkp);
2416 if (ret)
2417 goto done;
2418 }
2419
2420 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2421 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2422 ret = sd_start_stop_device(sdkp, 0);
2423 }
2424
2425 done:
2426 scsi_disk_put(sdkp);
2427 return ret;
2428 }
2429
2430 static int sd_resume(struct device *dev)
2431 {
2432 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2433 int ret = 0;
2434
2435 if (!sdkp->device->manage_start_stop)
2436 goto done;
2437
2438 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2439 ret = sd_start_stop_device(sdkp, 1);
2440
2441 done:
2442 scsi_disk_put(sdkp);
2443 return ret;
2444 }
2445
2446 /**
2447 * init_sd - entry point for this driver (both when built in or when
2448 * a module).
2449 *
2450 * Note: this function registers this driver with the scsi mid-level.
2451 **/
2452 static int __init init_sd(void)
2453 {
2454 int majors = 0, i, err;
2455
2456 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2457
2458 for (i = 0; i < SD_MAJORS; i++)
2459 if (register_blkdev(sd_major(i), "sd") == 0)
2460 majors++;
2461
2462 if (!majors)
2463 return -ENODEV;
2464
2465 err = class_register(&sd_disk_class);
2466 if (err)
2467 goto err_out;
2468
2469 err = scsi_register_driver(&sd_template.gendrv);
2470 if (err)
2471 goto err_out_class;
2472
2473 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
2474 0, 0, NULL);
2475 if (!sd_cdb_cache) {
2476 printk(KERN_ERR "sd: can't init extended cdb cache\n");
2477 goto err_out_class;
2478 }
2479
2480 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
2481 if (!sd_cdb_pool) {
2482 printk(KERN_ERR "sd: can't init extended cdb pool\n");
2483 goto err_out_cache;
2484 }
2485
2486 return 0;
2487
2488 err_out_cache:
2489 kmem_cache_destroy(sd_cdb_cache);
2490
2491 err_out_class:
2492 class_unregister(&sd_disk_class);
2493 err_out:
2494 for (i = 0; i < SD_MAJORS; i++)
2495 unregister_blkdev(sd_major(i), "sd");
2496 return err;
2497 }
2498
2499 /**
2500 * exit_sd - exit point for this driver (when it is a module).
2501 *
2502 * Note: this function unregisters this driver from the scsi mid-level.
2503 **/
2504 static void __exit exit_sd(void)
2505 {
2506 int i;
2507
2508 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2509
2510 mempool_destroy(sd_cdb_pool);
2511 kmem_cache_destroy(sd_cdb_cache);
2512
2513 scsi_unregister_driver(&sd_template.gendrv);
2514 class_unregister(&sd_disk_class);
2515
2516 for (i = 0; i < SD_MAJORS; i++)
2517 unregister_blkdev(sd_major(i), "sd");
2518 }
2519
2520 module_init(init_sd);
2521 module_exit(exit_sd);
2522
2523 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2524 struct scsi_sense_hdr *sshdr)
2525 {
2526 sd_printk(KERN_INFO, sdkp, "");
2527 scsi_show_sense_hdr(sshdr);
2528 sd_printk(KERN_INFO, sdkp, "");
2529 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2530 }
2531
2532 static void sd_print_result(struct scsi_disk *sdkp, int result)
2533 {
2534 sd_printk(KERN_INFO, sdkp, "");
2535 scsi_show_result(result);
2536 }
2537
Linux with added FPC-III support