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Merge tag 'v3.10.107' into update
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / sd.c
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 <asm/uaccess.h>
55 #include <asm/unaligned.h>
56
57 #include <scsi/scsi.h>
58 #include <scsi/scsi_cmnd.h>
59 #include <scsi/scsi_dbg.h>
60 #include <scsi/scsi_device.h>
61 #include <scsi/scsi_driver.h>
62 #include <scsi/scsi_eh.h>
63 #include <scsi/scsi_host.h>
64 #include <scsi/scsi_ioctl.h>
65 #include <scsi/scsicam.h>
66
67 #include "sd.h"
68 #include "scsi_priv.h"
69 #include "scsi_logging.h"
70
71 MODULE_AUTHOR("Eric Youngdale");
72 MODULE_DESCRIPTION("SCSI disk (sd) driver");
73 MODULE_LICENSE("GPL");
74
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
88 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
89 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
90 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
91 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
92 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
93 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
94
95 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
96 #define SD_MINORS 16
97 #else
98 #define SD_MINORS 0
99 #endif
100
101 static void sd_config_discard(struct scsi_disk *, unsigned int);
102 static void sd_config_write_same(struct scsi_disk *);
103 static int sd_revalidate_disk(struct gendisk *);
104 static void sd_unlock_native_capacity(struct gendisk *disk);
105 static int sd_probe(struct device *);
106 static int sd_remove(struct device *);
107 static void sd_shutdown(struct device *);
108 static int sd_suspend(struct device *);
109 static int sd_resume(struct device *);
110 static void sd_rescan(struct device *);
111 static int sd_done(struct scsi_cmnd *);
112 static int sd_eh_action(struct scsi_cmnd *, unsigned char *, int, int);
113 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
114 static void scsi_disk_release(struct device *cdev);
115 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
116 static void sd_print_result(struct scsi_disk *, int);
117
118 static DEFINE_SPINLOCK(sd_index_lock);
119 static DEFINE_IDA(sd_index_ida);
120
121 /* This semaphore is used to mediate the 0->1 reference get in the
122 * face of object destruction (i.e. we can't allow a get on an
123 * object after last put) */
124 static DEFINE_MUTEX(sd_ref_mutex);
125
126 static struct kmem_cache *sd_cdb_cache;
127 static mempool_t *sd_cdb_pool;
128
129 static const char *sd_cache_types[] = {
130 "write through", "none", "write back",
131 "write back, no read (daft)"
132 };
133
134 static ssize_t
135 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
136 const char *buf, size_t count)
137 {
138 int i, ct = -1, rcd, wce, sp;
139 struct scsi_disk *sdkp = to_scsi_disk(dev);
140 struct scsi_device *sdp = sdkp->device;
141 char buffer[64];
142 char *buffer_data;
143 struct scsi_mode_data data;
144 struct scsi_sense_hdr sshdr;
145 static const char temp[] = "temporary ";
146 int len;
147
148 if (sdp->type != TYPE_DISK)
149 /* no cache control on RBC devices; theoretically they
150 * can do it, but there's probably so many exceptions
151 * it's not worth the risk */
152 return -EINVAL;
153
154 if (strncmp(buf, temp, sizeof(temp) - 1) == 0) {
155 buf += sizeof(temp) - 1;
156 sdkp->cache_override = 1;
157 } else {
158 sdkp->cache_override = 0;
159 }
160
161 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
162 len = strlen(sd_cache_types[i]);
163 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
164 buf[len] == '\n') {
165 ct = i;
166 break;
167 }
168 }
169 if (ct < 0)
170 return -EINVAL;
171 rcd = ct & 0x01 ? 1 : 0;
172 wce = ct & 0x02 ? 1 : 0;
173
174 if (sdkp->cache_override) {
175 sdkp->WCE = wce;
176 sdkp->RCD = rcd;
177 return count;
178 }
179
180 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
181 SD_MAX_RETRIES, &data, NULL))
182 return -EINVAL;
183 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
184 data.block_descriptor_length);
185 buffer_data = buffer + data.header_length +
186 data.block_descriptor_length;
187 buffer_data[2] &= ~0x05;
188 buffer_data[2] |= wce << 2 | rcd;
189 sp = buffer_data[0] & 0x80 ? 1 : 0;
190
191 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
192 SD_MAX_RETRIES, &data, &sshdr)) {
193 if (scsi_sense_valid(&sshdr))
194 sd_print_sense_hdr(sdkp, &sshdr);
195 return -EINVAL;
196 }
197 revalidate_disk(sdkp->disk);
198 return count;
199 }
200
201 static ssize_t
202 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
203 const char *buf, size_t count)
204 {
205 struct scsi_disk *sdkp = to_scsi_disk(dev);
206 struct scsi_device *sdp = sdkp->device;
207
208 if (!capable(CAP_SYS_ADMIN))
209 return -EACCES;
210
211 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
212
213 return count;
214 }
215
216 static ssize_t
217 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
218 const char *buf, size_t count)
219 {
220 struct scsi_disk *sdkp = to_scsi_disk(dev);
221 struct scsi_device *sdp = sdkp->device;
222
223 if (!capable(CAP_SYS_ADMIN))
224 return -EACCES;
225
226 if (sdp->type != TYPE_DISK)
227 return -EINVAL;
228
229 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
230
231 return count;
232 }
233
234 static ssize_t
235 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
236 char *buf)
237 {
238 struct scsi_disk *sdkp = to_scsi_disk(dev);
239 int ct = sdkp->RCD + 2*sdkp->WCE;
240
241 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
242 }
243
244 static ssize_t
245 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
246 {
247 struct scsi_disk *sdkp = to_scsi_disk(dev);
248
249 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
250 }
251
252 static ssize_t
253 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
254 char *buf)
255 {
256 struct scsi_disk *sdkp = to_scsi_disk(dev);
257 struct scsi_device *sdp = sdkp->device;
258
259 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
260 }
261
262 static ssize_t
263 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
264 char *buf)
265 {
266 struct scsi_disk *sdkp = to_scsi_disk(dev);
267
268 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
269 }
270
271 static ssize_t
272 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
273 char *buf)
274 {
275 struct scsi_disk *sdkp = to_scsi_disk(dev);
276
277 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
278 }
279
280 static ssize_t
281 sd_store_protection_type(struct device *dev, struct device_attribute *attr,
282 const char *buf, size_t count)
283 {
284 struct scsi_disk *sdkp = to_scsi_disk(dev);
285 unsigned int val;
286 int err;
287
288 if (!capable(CAP_SYS_ADMIN))
289 return -EACCES;
290
291 err = kstrtouint(buf, 10, &val);
292
293 if (err)
294 return err;
295
296 if (val >= 0 && val <= SD_DIF_TYPE3_PROTECTION)
297 sdkp->protection_type = val;
298
299 return count;
300 }
301
302 static ssize_t
303 sd_show_protection_mode(struct device *dev, struct device_attribute *attr,
304 char *buf)
305 {
306 struct scsi_disk *sdkp = to_scsi_disk(dev);
307 struct scsi_device *sdp = sdkp->device;
308 unsigned int dif, dix;
309
310 dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
311 dix = scsi_host_dix_capable(sdp->host, sdkp->protection_type);
312
313 if (!dix && scsi_host_dix_capable(sdp->host, SD_DIF_TYPE0_PROTECTION)) {
314 dif = 0;
315 dix = 1;
316 }
317
318 if (!dif && !dix)
319 return snprintf(buf, 20, "none\n");
320
321 return snprintf(buf, 20, "%s%u\n", dix ? "dix" : "dif", dif);
322 }
323
324 static ssize_t
325 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
326 char *buf)
327 {
328 struct scsi_disk *sdkp = to_scsi_disk(dev);
329
330 return snprintf(buf, 20, "%u\n", sdkp->ATO);
331 }
332
333 static ssize_t
334 sd_show_thin_provisioning(struct device *dev, struct device_attribute *attr,
335 char *buf)
336 {
337 struct scsi_disk *sdkp = to_scsi_disk(dev);
338
339 return snprintf(buf, 20, "%u\n", sdkp->lbpme);
340 }
341
342 static const char *lbp_mode[] = {
343 [SD_LBP_FULL] = "full",
344 [SD_LBP_UNMAP] = "unmap",
345 [SD_LBP_WS16] = "writesame_16",
346 [SD_LBP_WS10] = "writesame_10",
347 [SD_LBP_ZERO] = "writesame_zero",
348 [SD_LBP_DISABLE] = "disabled",
349 };
350
351 static ssize_t
352 sd_show_provisioning_mode(struct device *dev, struct device_attribute *attr,
353 char *buf)
354 {
355 struct scsi_disk *sdkp = to_scsi_disk(dev);
356
357 return snprintf(buf, 20, "%s\n", lbp_mode[sdkp->provisioning_mode]);
358 }
359
360 static ssize_t
361 sd_store_provisioning_mode(struct device *dev, struct device_attribute *attr,
362 const char *buf, size_t count)
363 {
364 struct scsi_disk *sdkp = to_scsi_disk(dev);
365 struct scsi_device *sdp = sdkp->device;
366
367 if (!capable(CAP_SYS_ADMIN))
368 return -EACCES;
369
370 if (sdp->type != TYPE_DISK)
371 return -EINVAL;
372
373 if (!strncmp(buf, lbp_mode[SD_LBP_UNMAP], 20))
374 sd_config_discard(sdkp, SD_LBP_UNMAP);
375 else if (!strncmp(buf, lbp_mode[SD_LBP_WS16], 20))
376 sd_config_discard(sdkp, SD_LBP_WS16);
377 else if (!strncmp(buf, lbp_mode[SD_LBP_WS10], 20))
378 sd_config_discard(sdkp, SD_LBP_WS10);
379 else if (!strncmp(buf, lbp_mode[SD_LBP_ZERO], 20))
380 sd_config_discard(sdkp, SD_LBP_ZERO);
381 else if (!strncmp(buf, lbp_mode[SD_LBP_DISABLE], 20))
382 sd_config_discard(sdkp, SD_LBP_DISABLE);
383 else
384 return -EINVAL;
385
386 return count;
387 }
388
389 static ssize_t
390 sd_show_max_medium_access_timeouts(struct device *dev,
391 struct device_attribute *attr, char *buf)
392 {
393 struct scsi_disk *sdkp = to_scsi_disk(dev);
394
395 return snprintf(buf, 20, "%u\n", sdkp->max_medium_access_timeouts);
396 }
397
398 static ssize_t
399 sd_store_max_medium_access_timeouts(struct device *dev,
400 struct device_attribute *attr,
401 const char *buf, size_t count)
402 {
403 struct scsi_disk *sdkp = to_scsi_disk(dev);
404 int err;
405
406 if (!capable(CAP_SYS_ADMIN))
407 return -EACCES;
408
409 err = kstrtouint(buf, 10, &sdkp->max_medium_access_timeouts);
410
411 return err ? err : count;
412 }
413
414 static ssize_t
415 sd_show_write_same_blocks(struct device *dev, struct device_attribute *attr,
416 char *buf)
417 {
418 struct scsi_disk *sdkp = to_scsi_disk(dev);
419
420 return snprintf(buf, 20, "%u\n", sdkp->max_ws_blocks);
421 }
422
423 static ssize_t
424 sd_store_write_same_blocks(struct device *dev, struct device_attribute *attr,
425 const char *buf, size_t count)
426 {
427 struct scsi_disk *sdkp = to_scsi_disk(dev);
428 struct scsi_device *sdp = sdkp->device;
429 unsigned long max;
430 int err;
431
432 if (!capable(CAP_SYS_ADMIN))
433 return -EACCES;
434
435 if (sdp->type != TYPE_DISK)
436 return -EINVAL;
437
438 err = kstrtoul(buf, 10, &max);
439
440 if (err)
441 return err;
442
443 if (max == 0)
444 sdp->no_write_same = 1;
445 else if (max <= SD_MAX_WS16_BLOCKS) {
446 sdp->no_write_same = 0;
447 sdkp->max_ws_blocks = max;
448 }
449
450 sd_config_write_same(sdkp);
451
452 return count;
453 }
454
455 static struct device_attribute sd_disk_attrs[] = {
456 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
457 sd_store_cache_type),
458 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
459 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
460 sd_store_allow_restart),
461 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
462 sd_store_manage_start_stop),
463 __ATTR(protection_type, S_IRUGO|S_IWUSR, sd_show_protection_type,
464 sd_store_protection_type),
465 __ATTR(protection_mode, S_IRUGO, sd_show_protection_mode, NULL),
466 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
467 __ATTR(thin_provisioning, S_IRUGO, sd_show_thin_provisioning, NULL),
468 __ATTR(provisioning_mode, S_IRUGO|S_IWUSR, sd_show_provisioning_mode,
469 sd_store_provisioning_mode),
470 __ATTR(max_write_same_blocks, S_IRUGO|S_IWUSR,
471 sd_show_write_same_blocks, sd_store_write_same_blocks),
472 __ATTR(max_medium_access_timeouts, S_IRUGO|S_IWUSR,
473 sd_show_max_medium_access_timeouts,
474 sd_store_max_medium_access_timeouts),
475 __ATTR_NULL,
476 };
477
478 static struct class sd_disk_class = {
479 .name = "scsi_disk",
480 .owner = THIS_MODULE,
481 .dev_release = scsi_disk_release,
482 .dev_attrs = sd_disk_attrs,
483 };
484
485 static const struct dev_pm_ops sd_pm_ops = {
486 .suspend = sd_suspend,
487 .resume = sd_resume,
488 .poweroff = sd_suspend,
489 .restore = sd_resume,
490 .runtime_suspend = sd_suspend,
491 .runtime_resume = sd_resume,
492 };
493
494 static struct scsi_driver sd_template = {
495 .owner = THIS_MODULE,
496 .gendrv = {
497 .name = "sd",
498 .probe = sd_probe,
499 .remove = sd_remove,
500 .shutdown = sd_shutdown,
501 .pm = &sd_pm_ops,
502 },
503 .rescan = sd_rescan,
504 .done = sd_done,
505 .eh_action = sd_eh_action,
506 };
507
508 /*
509 * Device no to disk mapping:
510 *
511 * major disc2 disc p1
512 * |............|.............|....|....| <- dev_t
513 * 31 20 19 8 7 4 3 0
514 *
515 * Inside a major, we have 16k disks, however mapped non-
516 * contiguously. The first 16 disks are for major0, the next
517 * ones with major1, ... Disk 256 is for major0 again, disk 272
518 * for major1, ...
519 * As we stay compatible with our numbering scheme, we can reuse
520 * the well-know SCSI majors 8, 65--71, 136--143.
521 */
522 static int sd_major(int major_idx)
523 {
524 switch (major_idx) {
525 case 0:
526 return SCSI_DISK0_MAJOR;
527 case 1 ... 7:
528 return SCSI_DISK1_MAJOR + major_idx - 1;
529 case 8 ... 15:
530 return SCSI_DISK8_MAJOR + major_idx - 8;
531 default:
532 BUG();
533 return 0; /* shut up gcc */
534 }
535 }
536
537 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
538 {
539 struct scsi_disk *sdkp = NULL;
540
541 if (disk->private_data) {
542 sdkp = scsi_disk(disk);
543 if (scsi_device_get(sdkp->device) == 0)
544 get_device(&sdkp->dev);
545 else
546 sdkp = NULL;
547 }
548 return sdkp;
549 }
550
551 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
552 {
553 struct scsi_disk *sdkp;
554
555 mutex_lock(&sd_ref_mutex);
556 sdkp = __scsi_disk_get(disk);
557 mutex_unlock(&sd_ref_mutex);
558 return sdkp;
559 }
560
561 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
562 {
563 struct scsi_disk *sdkp;
564
565 mutex_lock(&sd_ref_mutex);
566 sdkp = dev_get_drvdata(dev);
567 if (sdkp)
568 sdkp = __scsi_disk_get(sdkp->disk);
569 mutex_unlock(&sd_ref_mutex);
570 return sdkp;
571 }
572
573 static void scsi_disk_put(struct scsi_disk *sdkp)
574 {
575 struct scsi_device *sdev = sdkp->device;
576
577 mutex_lock(&sd_ref_mutex);
578 put_device(&sdkp->dev);
579 scsi_device_put(sdev);
580 mutex_unlock(&sd_ref_mutex);
581 }
582
583 static void sd_prot_op(struct scsi_cmnd *scmd, unsigned int dif)
584 {
585 unsigned int prot_op = SCSI_PROT_NORMAL;
586 unsigned int dix = scsi_prot_sg_count(scmd);
587
588 if (scmd->sc_data_direction == DMA_FROM_DEVICE) {
589 if (dif && dix)
590 prot_op = SCSI_PROT_READ_PASS;
591 else if (dif && !dix)
592 prot_op = SCSI_PROT_READ_STRIP;
593 else if (!dif && dix)
594 prot_op = SCSI_PROT_READ_INSERT;
595 } else {
596 if (dif && dix)
597 prot_op = SCSI_PROT_WRITE_PASS;
598 else if (dif && !dix)
599 prot_op = SCSI_PROT_WRITE_INSERT;
600 else if (!dif && dix)
601 prot_op = SCSI_PROT_WRITE_STRIP;
602 }
603
604 scsi_set_prot_op(scmd, prot_op);
605 scsi_set_prot_type(scmd, dif);
606 }
607
608 static void sd_config_discard(struct scsi_disk *sdkp, unsigned int mode)
609 {
610 struct request_queue *q = sdkp->disk->queue;
611 unsigned int logical_block_size = sdkp->device->sector_size;
612 unsigned int max_blocks = 0;
613
614 q->limits.discard_zeroes_data = sdkp->lbprz;
615 q->limits.discard_alignment = sdkp->unmap_alignment *
616 logical_block_size;
617 q->limits.discard_granularity =
618 max(sdkp->physical_block_size,
619 sdkp->unmap_granularity * logical_block_size);
620
621 sdkp->provisioning_mode = mode;
622
623 switch (mode) {
624
625 case SD_LBP_DISABLE:
626 q->limits.max_discard_sectors = 0;
627 queue_flag_clear_unlocked(QUEUE_FLAG_DISCARD, q);
628 return;
629
630 case SD_LBP_UNMAP:
631 max_blocks = min_not_zero(sdkp->max_unmap_blocks,
632 (u32)SD_MAX_WS16_BLOCKS);
633 break;
634
635 case SD_LBP_WS16:
636 max_blocks = min_not_zero(sdkp->max_ws_blocks,
637 (u32)SD_MAX_WS16_BLOCKS);
638 break;
639
640 case SD_LBP_WS10:
641 max_blocks = min_not_zero(sdkp->max_ws_blocks,
642 (u32)SD_MAX_WS10_BLOCKS);
643 break;
644
645 case SD_LBP_ZERO:
646 max_blocks = min_not_zero(sdkp->max_ws_blocks,
647 (u32)SD_MAX_WS10_BLOCKS);
648 q->limits.discard_zeroes_data = 1;
649 break;
650 }
651
652 q->limits.max_discard_sectors = max_blocks * (logical_block_size >> 9);
653 queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, q);
654 }
655
656 /**
657 * sd_setup_discard_cmnd - unmap blocks on thinly provisioned device
658 * @sdp: scsi device to operate one
659 * @rq: Request to prepare
660 *
661 * Will issue either UNMAP or WRITE SAME(16) depending on preference
662 * indicated by target device.
663 **/
664 static int sd_setup_discard_cmnd(struct scsi_device *sdp, struct request *rq)
665 {
666 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
667 sector_t sector = blk_rq_pos(rq);
668 unsigned int nr_sectors = blk_rq_sectors(rq);
669 unsigned int nr_bytes = blk_rq_bytes(rq);
670 unsigned int len;
671 int ret;
672 char *buf;
673 struct page *page;
674
675 sector >>= ilog2(sdp->sector_size) - 9;
676 nr_sectors >>= ilog2(sdp->sector_size) - 9;
677 rq->timeout = SD_TIMEOUT;
678
679 memset(rq->cmd, 0, rq->cmd_len);
680
681 page = alloc_page(GFP_ATOMIC | __GFP_ZERO);
682 if (!page)
683 return BLKPREP_DEFER;
684
685 switch (sdkp->provisioning_mode) {
686 case SD_LBP_UNMAP:
687 buf = page_address(page);
688
689 rq->cmd_len = 10;
690 rq->cmd[0] = UNMAP;
691 rq->cmd[8] = 24;
692
693 put_unaligned_be16(6 + 16, &buf[0]);
694 put_unaligned_be16(16, &buf[2]);
695 put_unaligned_be64(sector, &buf[8]);
696 put_unaligned_be32(nr_sectors, &buf[16]);
697
698 len = 24;
699 break;
700
701 case SD_LBP_WS16:
702 rq->cmd_len = 16;
703 rq->cmd[0] = WRITE_SAME_16;
704 rq->cmd[1] = 0x8; /* UNMAP */
705 put_unaligned_be64(sector, &rq->cmd[2]);
706 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
707
708 len = sdkp->device->sector_size;
709 break;
710
711 case SD_LBP_WS10:
712 case SD_LBP_ZERO:
713 rq->cmd_len = 10;
714 rq->cmd[0] = WRITE_SAME;
715 if (sdkp->provisioning_mode == SD_LBP_WS10)
716 rq->cmd[1] = 0x8; /* UNMAP */
717 put_unaligned_be32(sector, &rq->cmd[2]);
718 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
719
720 len = sdkp->device->sector_size;
721 break;
722
723 default:
724 ret = BLKPREP_KILL;
725 goto out;
726 }
727
728 blk_add_request_payload(rq, page, len);
729 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
730 rq->buffer = page_address(page);
731 rq->__data_len = nr_bytes;
732
733 out:
734 if (ret != BLKPREP_OK) {
735 __free_page(page);
736 rq->buffer = NULL;
737 }
738 return ret;
739 }
740
741 static void sd_config_write_same(struct scsi_disk *sdkp)
742 {
743 struct request_queue *q = sdkp->disk->queue;
744 unsigned int logical_block_size = sdkp->device->sector_size;
745
746 if (sdkp->device->no_write_same) {
747 sdkp->max_ws_blocks = 0;
748 goto out;
749 }
750
751 /* Some devices can not handle block counts above 0xffff despite
752 * supporting WRITE SAME(16). Consequently we default to 64k
753 * blocks per I/O unless the device explicitly advertises a
754 * bigger limit.
755 */
756 if (sdkp->max_ws_blocks > SD_MAX_WS10_BLOCKS)
757 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
758 (u32)SD_MAX_WS16_BLOCKS);
759 else if (sdkp->ws16 || sdkp->ws10 || sdkp->device->no_report_opcodes)
760 sdkp->max_ws_blocks = min_not_zero(sdkp->max_ws_blocks,
761 (u32)SD_MAX_WS10_BLOCKS);
762 else {
763 sdkp->device->no_write_same = 1;
764 sdkp->max_ws_blocks = 0;
765 }
766
767 out:
768 blk_queue_max_write_same_sectors(q, sdkp->max_ws_blocks *
769 (logical_block_size >> 9));
770 }
771
772 /**
773 * sd_setup_write_same_cmnd - write the same data to multiple blocks
774 * @sdp: scsi device to operate one
775 * @rq: Request to prepare
776 *
777 * Will issue either WRITE SAME(10) or WRITE SAME(16) depending on
778 * preference indicated by target device.
779 **/
780 static int sd_setup_write_same_cmnd(struct scsi_device *sdp, struct request *rq)
781 {
782 struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
783 struct bio *bio = rq->bio;
784 sector_t sector = blk_rq_pos(rq);
785 unsigned int nr_sectors = blk_rq_sectors(rq);
786 unsigned int nr_bytes = blk_rq_bytes(rq);
787 int ret;
788
789 if (sdkp->device->no_write_same)
790 return BLKPREP_KILL;
791
792 BUG_ON(bio_offset(bio) || bio_iovec(bio)->bv_len != sdp->sector_size);
793
794 sector >>= ilog2(sdp->sector_size) - 9;
795 nr_sectors >>= ilog2(sdp->sector_size) - 9;
796
797 rq->__data_len = sdp->sector_size;
798 rq->timeout = SD_WRITE_SAME_TIMEOUT;
799 memset(rq->cmd, 0, rq->cmd_len);
800
801 if (sdkp->ws16 || sector > 0xffffffff || nr_sectors > 0xffff) {
802 rq->cmd_len = 16;
803 rq->cmd[0] = WRITE_SAME_16;
804 put_unaligned_be64(sector, &rq->cmd[2]);
805 put_unaligned_be32(nr_sectors, &rq->cmd[10]);
806 } else {
807 rq->cmd_len = 10;
808 rq->cmd[0] = WRITE_SAME;
809 put_unaligned_be32(sector, &rq->cmd[2]);
810 put_unaligned_be16(nr_sectors, &rq->cmd[7]);
811 }
812
813 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
814 rq->__data_len = nr_bytes;
815
816 return ret;
817 }
818
819 static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
820 {
821 rq->timeout = SD_FLUSH_TIMEOUT;
822 rq->retries = SD_MAX_RETRIES;
823 rq->cmd[0] = SYNCHRONIZE_CACHE;
824 rq->cmd_len = 10;
825
826 return scsi_setup_blk_pc_cmnd(sdp, rq);
827 }
828
829 static void sd_unprep_fn(struct request_queue *q, struct request *rq)
830 {
831 struct scsi_cmnd *SCpnt = rq->special;
832
833 if (rq->cmd_flags & REQ_DISCARD) {
834 free_page((unsigned long)rq->buffer);
835 rq->buffer = NULL;
836 }
837 if (SCpnt->cmnd != rq->cmd) {
838 mempool_free(SCpnt->cmnd, sd_cdb_pool);
839 SCpnt->cmnd = NULL;
840 SCpnt->cmd_len = 0;
841 }
842 }
843
844 /**
845 * sd_prep_fn - build a scsi (read or write) command from
846 * information in the request structure.
847 * @SCpnt: pointer to mid-level's per scsi command structure that
848 * contains request and into which the scsi command is written
849 *
850 * Returns 1 if successful and 0 if error (or cannot be done now).
851 **/
852 static int sd_prep_fn(struct request_queue *q, struct request *rq)
853 {
854 struct scsi_cmnd *SCpnt;
855 struct scsi_device *sdp = q->queuedata;
856 struct gendisk *disk = rq->rq_disk;
857 struct scsi_disk *sdkp;
858 sector_t block = blk_rq_pos(rq);
859 sector_t threshold;
860 unsigned int this_count = blk_rq_sectors(rq);
861 int ret, host_dif;
862 unsigned char protect;
863
864 /*
865 * Discard request come in as REQ_TYPE_FS but we turn them into
866 * block PC requests to make life easier.
867 */
868 if (rq->cmd_flags & REQ_DISCARD) {
869 ret = sd_setup_discard_cmnd(sdp, rq);
870 goto out;
871 } else if (rq->cmd_flags & REQ_WRITE_SAME) {
872 ret = sd_setup_write_same_cmnd(sdp, rq);
873 goto out;
874 } else if (rq->cmd_flags & REQ_FLUSH) {
875 ret = scsi_setup_flush_cmnd(sdp, rq);
876 goto out;
877 } else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
878 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
879 goto out;
880 } else if (rq->cmd_type != REQ_TYPE_FS) {
881 ret = BLKPREP_KILL;
882 goto out;
883 }
884 ret = scsi_setup_fs_cmnd(sdp, rq);
885 if (ret != BLKPREP_OK)
886 goto out;
887 SCpnt = rq->special;
888 sdkp = scsi_disk(disk);
889
890 /* from here on until we're complete, any goto out
891 * is used for a killable error condition */
892 ret = BLKPREP_KILL;
893
894 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
895 "sd_prep_fn: block=%llu, "
896 "count=%d\n",
897 (unsigned long long)block,
898 this_count));
899
900 if (!sdp || !scsi_device_online(sdp) ||
901 block + blk_rq_sectors(rq) > get_capacity(disk)) {
902 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
903 "Finishing %u sectors\n",
904 blk_rq_sectors(rq)));
905 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
906 "Retry with 0x%p\n", SCpnt));
907 goto out;
908 }
909
910 if (sdp->changed) {
911 /*
912 * quietly refuse to do anything to a changed disc until
913 * the changed bit has been reset
914 */
915 /* printk("SCSI disk has been changed or is not present. Prohibiting further I/O.\n"); */
916 goto out;
917 }
918
919 /*
920 * Some SD card readers can't handle multi-sector accesses which touch
921 * the last one or two hardware sectors. Split accesses as needed.
922 */
923 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
924 (sdp->sector_size / 512);
925
926 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
927 if (block < threshold) {
928 /* Access up to the threshold but not beyond */
929 this_count = threshold - block;
930 } else {
931 /* Access only a single hardware sector */
932 this_count = sdp->sector_size / 512;
933 }
934 }
935
936 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
937 (unsigned long long)block));
938
939 /*
940 * If we have a 1K hardware sectorsize, prevent access to single
941 * 512 byte sectors. In theory we could handle this - in fact
942 * the scsi cdrom driver must be able to handle this because
943 * we typically use 1K blocksizes, and cdroms typically have
944 * 2K hardware sectorsizes. Of course, things are simpler
945 * with the cdrom, since it is read-only. For performance
946 * reasons, the filesystems should be able to handle this
947 * and not force the scsi disk driver to use bounce buffers
948 * for this.
949 */
950 if (sdp->sector_size == 1024) {
951 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
952 scmd_printk(KERN_ERR, SCpnt,
953 "Bad block number requested\n");
954 goto out;
955 } else {
956 block = block >> 1;
957 this_count = this_count >> 1;
958 }
959 }
960 if (sdp->sector_size == 2048) {
961 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
962 scmd_printk(KERN_ERR, SCpnt,
963 "Bad block number requested\n");
964 goto out;
965 } else {
966 block = block >> 2;
967 this_count = this_count >> 2;
968 }
969 }
970 if (sdp->sector_size == 4096) {
971 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
972 scmd_printk(KERN_ERR, SCpnt,
973 "Bad block number requested\n");
974 goto out;
975 } else {
976 block = block >> 3;
977 this_count = this_count >> 3;
978 }
979 }
980 if (rq_data_dir(rq) == WRITE) {
981 if (!sdp->writeable) {
982 goto out;
983 }
984 SCpnt->cmnd[0] = WRITE_6;
985 SCpnt->sc_data_direction = DMA_TO_DEVICE;
986
987 if (blk_integrity_rq(rq))
988 sd_dif_prepare(rq, block, sdp->sector_size);
989
990 } else if (rq_data_dir(rq) == READ) {
991 SCpnt->cmnd[0] = READ_6;
992 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
993 } else {
994 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
995 goto out;
996 }
997
998 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
999 "%s %d/%u 512 byte blocks.\n",
1000 (rq_data_dir(rq) == WRITE) ?
1001 "writing" : "reading", this_count,
1002 blk_rq_sectors(rq)));
1003
1004 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
1005 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
1006 if (host_dif)
1007 protect = 1 << 5;
1008 else
1009 protect = 0;
1010
1011 if (host_dif == SD_DIF_TYPE2_PROTECTION) {
1012 SCpnt->cmnd = mempool_alloc(sd_cdb_pool, GFP_ATOMIC);
1013
1014 if (unlikely(SCpnt->cmnd == NULL)) {
1015 ret = BLKPREP_DEFER;
1016 goto out;
1017 }
1018
1019 SCpnt->cmd_len = SD_EXT_CDB_SIZE;
1020 memset(SCpnt->cmnd, 0, SCpnt->cmd_len);
1021 SCpnt->cmnd[0] = VARIABLE_LENGTH_CMD;
1022 SCpnt->cmnd[7] = 0x18;
1023 SCpnt->cmnd[9] = (rq_data_dir(rq) == READ) ? READ_32 : WRITE_32;
1024 SCpnt->cmnd[10] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1025
1026 /* LBA */
1027 SCpnt->cmnd[12] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1028 SCpnt->cmnd[13] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1029 SCpnt->cmnd[14] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1030 SCpnt->cmnd[15] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1031 SCpnt->cmnd[16] = (unsigned char) (block >> 24) & 0xff;
1032 SCpnt->cmnd[17] = (unsigned char) (block >> 16) & 0xff;
1033 SCpnt->cmnd[18] = (unsigned char) (block >> 8) & 0xff;
1034 SCpnt->cmnd[19] = (unsigned char) block & 0xff;
1035
1036 /* Expected Indirect LBA */
1037 SCpnt->cmnd[20] = (unsigned char) (block >> 24) & 0xff;
1038 SCpnt->cmnd[21] = (unsigned char) (block >> 16) & 0xff;
1039 SCpnt->cmnd[22] = (unsigned char) (block >> 8) & 0xff;
1040 SCpnt->cmnd[23] = (unsigned char) block & 0xff;
1041
1042 /* Transfer length */
1043 SCpnt->cmnd[28] = (unsigned char) (this_count >> 24) & 0xff;
1044 SCpnt->cmnd[29] = (unsigned char) (this_count >> 16) & 0xff;
1045 SCpnt->cmnd[30] = (unsigned char) (this_count >> 8) & 0xff;
1046 SCpnt->cmnd[31] = (unsigned char) this_count & 0xff;
1047 } else if (sdp->use_16_for_rw) {
1048 SCpnt->cmnd[0] += READ_16 - READ_6;
1049 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1050 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
1051 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
1052 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
1053 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
1054 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
1055 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
1056 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
1057 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
1058 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
1059 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
1060 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
1061 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
1062 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
1063 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
1064 scsi_device_protection(SCpnt->device) ||
1065 SCpnt->device->use_10_for_rw) {
1066 if (this_count > 0xffff)
1067 this_count = 0xffff;
1068
1069 SCpnt->cmnd[0] += READ_10 - READ_6;
1070 SCpnt->cmnd[1] = protect | ((rq->cmd_flags & REQ_FUA) ? 0x8 : 0);
1071 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
1072 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
1073 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
1074 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
1075 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
1076 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
1077 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
1078 } else {
1079 if (unlikely(rq->cmd_flags & REQ_FUA)) {
1080 /*
1081 * This happens only if this drive failed
1082 * 10byte rw command with ILLEGAL_REQUEST
1083 * during operation and thus turned off
1084 * use_10_for_rw.
1085 */
1086 scmd_printk(KERN_ERR, SCpnt,
1087 "FUA write on READ/WRITE(6) drive\n");
1088 goto out;
1089 }
1090
1091 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
1092 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
1093 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
1094 SCpnt->cmnd[4] = (unsigned char) this_count;
1095 SCpnt->cmnd[5] = 0;
1096 }
1097 SCpnt->sdb.length = this_count * sdp->sector_size;
1098
1099 /* If DIF or DIX is enabled, tell HBA how to handle request */
1100 if (host_dif || scsi_prot_sg_count(SCpnt))
1101 sd_prot_op(SCpnt, host_dif);
1102
1103 /*
1104 * We shouldn't disconnect in the middle of a sector, so with a dumb
1105 * host adapter, it's safe to assume that we can at least transfer
1106 * this many bytes between each connect / disconnect.
1107 */
1108 SCpnt->transfersize = sdp->sector_size;
1109 SCpnt->underflow = this_count << 9;
1110 SCpnt->allowed = SD_MAX_RETRIES;
1111
1112 /*
1113 * This indicates that the command is ready from our end to be
1114 * queued.
1115 */
1116 ret = BLKPREP_OK;
1117 out:
1118 return scsi_prep_return(q, rq, ret);
1119 }
1120
1121 /**
1122 * sd_open - open a scsi disk device
1123 * @inode: only i_rdev member may be used
1124 * @filp: only f_mode and f_flags may be used
1125 *
1126 * Returns 0 if successful. Returns a negated errno value in case
1127 * of error.
1128 *
1129 * Note: This can be called from a user context (e.g. fsck(1) )
1130 * or from within the kernel (e.g. as a result of a mount(1) ).
1131 * In the latter case @inode and @filp carry an abridged amount
1132 * of information as noted above.
1133 *
1134 * Locking: called with bdev->bd_mutex held.
1135 **/
1136 static int sd_open(struct block_device *bdev, fmode_t mode)
1137 {
1138 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
1139 struct scsi_device *sdev;
1140 int retval;
1141
1142 if (!sdkp)
1143 return -ENXIO;
1144
1145 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
1146
1147 sdev = sdkp->device;
1148
1149 /*
1150 * If the device is in error recovery, wait until it is done.
1151 * If the device is offline, then disallow any access to it.
1152 */
1153 retval = -ENXIO;
1154 if (!scsi_block_when_processing_errors(sdev))
1155 goto error_out;
1156
1157 if (sdev->removable || sdkp->write_prot)
1158 check_disk_change(bdev);
1159
1160 /*
1161 * If the drive is empty, just let the open fail.
1162 */
1163 retval = -ENOMEDIUM;
1164 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
1165 goto error_out;
1166
1167 /*
1168 * If the device has the write protect tab set, have the open fail
1169 * if the user expects to be able to write to the thing.
1170 */
1171 retval = -EROFS;
1172 if (sdkp->write_prot && (mode & FMODE_WRITE))
1173 goto error_out;
1174
1175 /*
1176 * It is possible that the disk changing stuff resulted in
1177 * the device being taken offline. If this is the case,
1178 * report this to the user, and don't pretend that the
1179 * open actually succeeded.
1180 */
1181 retval = -ENXIO;
1182 if (!scsi_device_online(sdev))
1183 goto error_out;
1184
1185 if ((atomic_inc_return(&sdkp->openers) == 1) && sdev->removable) {
1186 if (scsi_block_when_processing_errors(sdev))
1187 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
1188 }
1189
1190 return 0;
1191
1192 error_out:
1193 scsi_disk_put(sdkp);
1194 return retval;
1195 }
1196
1197 /**
1198 * sd_release - invoked when the (last) close(2) is called on this
1199 * scsi disk.
1200 * @inode: only i_rdev member may be used
1201 * @filp: only f_mode and f_flags may be used
1202 *
1203 * Returns 0.
1204 *
1205 * Note: may block (uninterruptible) if error recovery is underway
1206 * on this disk.
1207 *
1208 * Locking: called with bdev->bd_mutex held.
1209 **/
1210 static void sd_release(struct gendisk *disk, fmode_t mode)
1211 {
1212 struct scsi_disk *sdkp = scsi_disk(disk);
1213 struct scsi_device *sdev = sdkp->device;
1214
1215 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
1216
1217 if (atomic_dec_return(&sdkp->openers) == 0 && sdev->removable) {
1218 if (scsi_block_when_processing_errors(sdev))
1219 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
1220 }
1221
1222 /*
1223 * XXX and what if there are packets in flight and this close()
1224 * XXX is followed by a "rmmod sd_mod"?
1225 */
1226
1227 scsi_disk_put(sdkp);
1228 }
1229
1230 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
1231 {
1232 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
1233 struct scsi_device *sdp = sdkp->device;
1234 struct Scsi_Host *host = sdp->host;
1235 int diskinfo[4];
1236
1237 /* default to most commonly used values */
1238 diskinfo[0] = 0x40; /* 1 << 6 */
1239 diskinfo[1] = 0x20; /* 1 << 5 */
1240 diskinfo[2] = sdkp->capacity >> 11;
1241
1242 /* override with calculated, extended default, or driver values */
1243 if (host->hostt->bios_param)
1244 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
1245 else
1246 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
1247
1248 geo->heads = diskinfo[0];
1249 geo->sectors = diskinfo[1];
1250 geo->cylinders = diskinfo[2];
1251 return 0;
1252 }
1253
1254 /**
1255 * sd_ioctl - process an ioctl
1256 * @inode: only i_rdev/i_bdev members may be used
1257 * @filp: only f_mode and f_flags may be used
1258 * @cmd: ioctl command number
1259 * @arg: this is third argument given to ioctl(2) system call.
1260 * Often contains a pointer.
1261 *
1262 * Returns 0 if successful (some ioctls return positive numbers on
1263 * success as well). Returns a negated errno value in case of error.
1264 *
1265 * Note: most ioctls are forward onto the block subsystem or further
1266 * down in the scsi subsystem.
1267 **/
1268 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
1269 unsigned int cmd, unsigned long arg)
1270 {
1271 struct gendisk *disk = bdev->bd_disk;
1272 struct scsi_disk *sdkp = scsi_disk(disk);
1273 struct scsi_device *sdp = sdkp->device;
1274 void __user *p = (void __user *)arg;
1275 int error;
1276
1277 SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, "
1278 "cmd=0x%x\n", disk->disk_name, cmd));
1279
1280 error = scsi_verify_blk_ioctl(bdev, cmd);
1281 if (error < 0)
1282 return error;
1283
1284 /*
1285 * If we are in the middle of error recovery, don't let anyone
1286 * else try and use this device. Also, if error recovery fails, it
1287 * may try and take the device offline, in which case all further
1288 * access to the device is prohibited.
1289 */
1290 error = scsi_nonblockable_ioctl(sdp, cmd, p,
1291 (mode & FMODE_NDELAY) != 0);
1292 if (!scsi_block_when_processing_errors(sdp) || !error)
1293 goto out;
1294
1295 /*
1296 * Send SCSI addressing ioctls directly to mid level, send other
1297 * ioctls to block level and then onto mid level if they can't be
1298 * resolved.
1299 */
1300 switch (cmd) {
1301 case SCSI_IOCTL_GET_IDLUN:
1302 case SCSI_IOCTL_GET_BUS_NUMBER:
1303 error = scsi_ioctl(sdp, cmd, p);
1304 break;
1305 default:
1306 error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p);
1307 if (error != -ENOTTY)
1308 break;
1309 error = scsi_ioctl(sdp, cmd, p);
1310 break;
1311 }
1312 out:
1313 return error;
1314 }
1315
1316 static void set_media_not_present(struct scsi_disk *sdkp)
1317 {
1318 if (sdkp->media_present)
1319 sdkp->device->changed = 1;
1320
1321 if (sdkp->device->removable) {
1322 sdkp->media_present = 0;
1323 sdkp->capacity = 0;
1324 }
1325 }
1326
1327 static int media_not_present(struct scsi_disk *sdkp,
1328 struct scsi_sense_hdr *sshdr)
1329 {
1330 if (!scsi_sense_valid(sshdr))
1331 return 0;
1332
1333 /* not invoked for commands that could return deferred errors */
1334 switch (sshdr->sense_key) {
1335 case UNIT_ATTENTION:
1336 case NOT_READY:
1337 /* medium not present */
1338 if (sshdr->asc == 0x3A) {
1339 set_media_not_present(sdkp);
1340 return 1;
1341 }
1342 }
1343 return 0;
1344 }
1345
1346 /**
1347 * sd_check_events - check media events
1348 * @disk: kernel device descriptor
1349 * @clearing: disk events currently being cleared
1350 *
1351 * Returns mask of DISK_EVENT_*.
1352 *
1353 * Note: this function is invoked from the block subsystem.
1354 **/
1355 static unsigned int sd_check_events(struct gendisk *disk, unsigned int clearing)
1356 {
1357 struct scsi_disk *sdkp = scsi_disk_get(disk);
1358 struct scsi_device *sdp;
1359 struct scsi_sense_hdr *sshdr = NULL;
1360 int retval;
1361
1362 if (!sdkp)
1363 return 0;
1364
1365 sdp = sdkp->device;
1366 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_check_events\n"));
1367
1368 /*
1369 * If the device is offline, don't send any commands - just pretend as
1370 * if the command failed. If the device ever comes back online, we
1371 * can deal with it then. It is only because of unrecoverable errors
1372 * that we would ever take a device offline in the first place.
1373 */
1374 if (!scsi_device_online(sdp)) {
1375 set_media_not_present(sdkp);
1376 goto out;
1377 }
1378
1379 /*
1380 * Using TEST_UNIT_READY enables differentiation between drive with
1381 * no cartridge loaded - NOT READY, drive with changed cartridge -
1382 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
1383 *
1384 * Drives that auto spin down. eg iomega jaz 1G, will be started
1385 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
1386 * sd_revalidate() is called.
1387 */
1388 retval = -ENODEV;
1389
1390 if (scsi_block_when_processing_errors(sdp)) {
1391 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
1392 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
1393 sshdr);
1394 }
1395
1396 /* failed to execute TUR, assume media not present */
1397 if (host_byte(retval)) {
1398 set_media_not_present(sdkp);
1399 goto out;
1400 }
1401
1402 if (media_not_present(sdkp, sshdr))
1403 goto out;
1404
1405 /*
1406 * For removable scsi disk we have to recognise the presence
1407 * of a disk in the drive.
1408 */
1409 if (!sdkp->media_present)
1410 sdp->changed = 1;
1411 sdkp->media_present = 1;
1412 out:
1413 /*
1414 * sdp->changed is set under the following conditions:
1415 *
1416 * Medium present state has changed in either direction.
1417 * Device has indicated UNIT_ATTENTION.
1418 */
1419 kfree(sshdr);
1420 retval = sdp->changed ? DISK_EVENT_MEDIA_CHANGE : 0;
1421 #ifdef CONFIG_MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT
1422 //add for sdcard hotplug start
1423 if(1 == retval){
1424 if(sdkp->old_media_present != sdkp->media_present){
1425 retval |= sdkp->media_present ? 0 : DISK_EVENT_MEDIA_DISAPPEAR;
1426 sdkp->old_media_present = sdkp->media_present;
1427 }
1428 }
1429 //add for sdcard hotplug end
1430 #endif
1431 sdp->changed = 0;
1432 scsi_disk_put(sdkp);
1433 return retval;
1434 }
1435
1436 static int sd_sync_cache(struct scsi_disk *sdkp)
1437 {
1438 int retries, res;
1439 struct scsi_device *sdp = sdkp->device;
1440 struct scsi_sense_hdr sshdr;
1441
1442 if (!scsi_device_online(sdp))
1443 return -ENODEV;
1444
1445
1446 for (retries = 3; retries > 0; --retries) {
1447 unsigned char cmd[10] = { 0 };
1448
1449 cmd[0] = SYNCHRONIZE_CACHE;
1450 /*
1451 * Leave the rest of the command zero to indicate
1452 * flush everything.
1453 */
1454 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0,
1455 &sshdr, SD_FLUSH_TIMEOUT,
1456 SD_MAX_RETRIES, NULL, REQ_PM);
1457 if (res == 0)
1458 break;
1459 }
1460
1461 if (res) {
1462 sd_print_result(sdkp, res);
1463 if (driver_byte(res) & DRIVER_SENSE)
1464 sd_print_sense_hdr(sdkp, &sshdr);
1465 }
1466
1467 if (res)
1468 return -EIO;
1469 return 0;
1470 }
1471
1472 static void sd_rescan(struct device *dev)
1473 {
1474 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
1475
1476 if (sdkp) {
1477 revalidate_disk(sdkp->disk);
1478 scsi_disk_put(sdkp);
1479 }
1480 }
1481
1482
1483 #ifdef CONFIG_COMPAT
1484 /*
1485 * This gets directly called from VFS. When the ioctl
1486 * is not recognized we go back to the other translation paths.
1487 */
1488 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
1489 unsigned int cmd, unsigned long arg)
1490 {
1491 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
1492 int ret;
1493
1494 ret = scsi_verify_blk_ioctl(bdev, cmd);
1495 if (ret < 0)
1496 return ret;
1497
1498 /*
1499 * If we are in the middle of error recovery, don't let anyone
1500 * else try and use this device. Also, if error recovery fails, it
1501 * may try and take the device offline, in which case all further
1502 * access to the device is prohibited.
1503 */
1504 if (!scsi_block_when_processing_errors(sdev))
1505 return -ENODEV;
1506
1507 if (sdev->host->hostt->compat_ioctl) {
1508 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
1509
1510 return ret;
1511 }
1512
1513 /*
1514 * Let the static ioctl translation table take care of it.
1515 */
1516 return -ENOIOCTLCMD;
1517 }
1518 #endif
1519
1520 static const struct block_device_operations sd_fops = {
1521 .owner = THIS_MODULE,
1522 .open = sd_open,
1523 .release = sd_release,
1524 .ioctl = sd_ioctl,
1525 .getgeo = sd_getgeo,
1526 #ifdef CONFIG_COMPAT
1527 .compat_ioctl = sd_compat_ioctl,
1528 #endif
1529 .check_events = sd_check_events,
1530 .revalidate_disk = sd_revalidate_disk,
1531 .unlock_native_capacity = sd_unlock_native_capacity,
1532 };
1533
1534 /**
1535 * sd_eh_action - error handling callback
1536 * @scmd: sd-issued command that has failed
1537 * @eh_cmnd: The command that was sent during error handling
1538 * @eh_cmnd_len: Length of eh_cmnd in bytes
1539 * @eh_disp: The recovery disposition suggested by the midlayer
1540 *
1541 * This function is called by the SCSI midlayer upon completion of
1542 * an error handling command (TEST UNIT READY, START STOP UNIT,
1543 * etc.) The command sent to the device by the error handler is
1544 * stored in eh_cmnd. The result of sending the eh command is
1545 * passed in eh_disp.
1546 **/
1547 static int sd_eh_action(struct scsi_cmnd *scmd, unsigned char *eh_cmnd,
1548 int eh_cmnd_len, int eh_disp)
1549 {
1550 struct scsi_disk *sdkp = scsi_disk(scmd->request->rq_disk);
1551
1552 if (!scsi_device_online(scmd->device) ||
1553 !scsi_medium_access_command(scmd))
1554 return eh_disp;
1555
1556 /*
1557 * The device has timed out executing a medium access command.
1558 * However, the TEST UNIT READY command sent during error
1559 * handling completed successfully. Either the device is in the
1560 * process of recovering or has it suffered an internal failure
1561 * that prevents access to the storage medium.
1562 */
1563 if (host_byte(scmd->result) == DID_TIME_OUT && eh_disp == SUCCESS &&
1564 eh_cmnd_len && eh_cmnd[0] == TEST_UNIT_READY)
1565 sdkp->medium_access_timed_out++;
1566
1567 /*
1568 * If the device keeps failing read/write commands but TEST UNIT
1569 * READY always completes successfully we assume that medium
1570 * access is no longer possible and take the device offline.
1571 */
1572 if (sdkp->medium_access_timed_out >= sdkp->max_medium_access_timeouts) {
1573 scmd_printk(KERN_ERR, scmd,
1574 "Medium access timeout failure. Offlining disk!\n");
1575 scsi_device_set_state(scmd->device, SDEV_OFFLINE);
1576
1577 return FAILED;
1578 }
1579
1580 return eh_disp;
1581 }
1582
1583 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
1584 {
1585 u64 start_lba = blk_rq_pos(scmd->request);
1586 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
1587 u64 bad_lba;
1588 int info_valid;
1589 /*
1590 * resid is optional but mostly filled in. When it's unused,
1591 * its value is zero, so we assume the whole buffer transferred
1592 */
1593 unsigned int transferred = scsi_bufflen(scmd) - scsi_get_resid(scmd);
1594 unsigned int good_bytes;
1595
1596 if (scmd->request->cmd_type != REQ_TYPE_FS)
1597 return 0;
1598
1599 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
1600 SCSI_SENSE_BUFFERSIZE,
1601 &bad_lba);
1602 if (!info_valid)
1603 return 0;
1604
1605 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
1606 return 0;
1607
1608 if (scmd->device->sector_size < 512) {
1609 /* only legitimate sector_size here is 256 */
1610 start_lba <<= 1;
1611 end_lba <<= 1;
1612 } else {
1613 /* be careful ... don't want any overflows */
1614 u64 factor = scmd->device->sector_size / 512;
1615 do_div(start_lba, factor);
1616 do_div(end_lba, factor);
1617 }
1618
1619 /* The bad lba was reported incorrectly, we have no idea where
1620 * the error is.
1621 */
1622 if (bad_lba < start_lba || bad_lba >= end_lba)
1623 return 0;
1624
1625 /* This computation should always be done in terms of
1626 * the resolution of the device's medium.
1627 */
1628 good_bytes = (bad_lba - start_lba) * scmd->device->sector_size;
1629 return min(good_bytes, transferred);
1630 }
1631
1632 /**
1633 * sd_done - bottom half handler: called when the lower level
1634 * driver has completed (successfully or otherwise) a scsi command.
1635 * @SCpnt: mid-level's per command structure.
1636 *
1637 * Note: potentially run from within an ISR. Must not block.
1638 **/
1639 static int sd_done(struct scsi_cmnd *SCpnt)
1640 {
1641 int result = SCpnt->result;
1642 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1643 struct scsi_sense_hdr sshdr;
1644 struct scsi_disk *sdkp = scsi_disk(SCpnt->request->rq_disk);
1645 struct request *req = SCpnt->request;
1646 int sense_valid = 0;
1647 int sense_deferred = 0;
1648 unsigned char op = SCpnt->cmnd[0];
1649 unsigned char unmap = SCpnt->cmnd[1] & 8;
1650
1651 if (req->cmd_flags & REQ_DISCARD || req->cmd_flags & REQ_WRITE_SAME) {
1652 if (!result) {
1653 good_bytes = blk_rq_bytes(req);
1654 scsi_set_resid(SCpnt, 0);
1655 } else {
1656 good_bytes = 0;
1657 scsi_set_resid(SCpnt, blk_rq_bytes(req));
1658 }
1659 }
1660
1661 if (result) {
1662 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1663 if (sense_valid)
1664 sense_deferred = scsi_sense_is_deferred(&sshdr);
1665 }
1666 #ifdef CONFIG_SCSI_LOGGING
1667 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1668 if (sense_valid) {
1669 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1670 "sd_done: sb[respc,sk,asc,"
1671 "ascq]=%x,%x,%x,%x\n",
1672 sshdr.response_code,
1673 sshdr.sense_key, sshdr.asc,
1674 sshdr.ascq));
1675 }
1676 #endif
1677 if (driver_byte(result) != DRIVER_SENSE &&
1678 (!sense_valid || sense_deferred))
1679 goto out;
1680
1681 sdkp->medium_access_timed_out = 0;
1682
1683 switch (sshdr.sense_key) {
1684 case HARDWARE_ERROR:
1685 case MEDIUM_ERROR:
1686 good_bytes = sd_completed_bytes(SCpnt);
1687 break;
1688 case RECOVERED_ERROR:
1689 good_bytes = scsi_bufflen(SCpnt);
1690 break;
1691 case NO_SENSE:
1692 /* This indicates a false check condition, so ignore it. An
1693 * unknown amount of data was transferred so treat it as an
1694 * error.
1695 */
1696 scsi_print_sense("sd", SCpnt);
1697 SCpnt->result = 0;
1698 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1699 break;
1700 case ABORTED_COMMAND:
1701 if (sshdr.asc == 0x10) /* DIF: Target detected corruption */
1702 good_bytes = sd_completed_bytes(SCpnt);
1703 break;
1704 case ILLEGAL_REQUEST:
1705 if (sshdr.asc == 0x10) /* DIX: Host detected corruption */
1706 good_bytes = sd_completed_bytes(SCpnt);
1707 /* INVALID COMMAND OPCODE or INVALID FIELD IN CDB */
1708 if (sshdr.asc == 0x20 || sshdr.asc == 0x24) {
1709 switch (op) {
1710 case UNMAP:
1711 sd_config_discard(sdkp, SD_LBP_DISABLE);
1712 break;
1713 case WRITE_SAME_16:
1714 case WRITE_SAME:
1715 if (unmap)
1716 sd_config_discard(sdkp, SD_LBP_DISABLE);
1717 else {
1718 sdkp->device->no_write_same = 1;
1719 sd_config_write_same(sdkp);
1720
1721 good_bytes = 0;
1722 req->__data_len = blk_rq_bytes(req);
1723 req->cmd_flags |= REQ_QUIET;
1724 }
1725 }
1726 }
1727 break;
1728 default:
1729 break;
1730 }
1731 out:
1732 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1733 sd_dif_complete(SCpnt, good_bytes);
1734
1735 return good_bytes;
1736 }
1737
1738 /*
1739 * spinup disk - called only in sd_revalidate_disk()
1740 */
1741 static void
1742 sd_spinup_disk(struct scsi_disk *sdkp)
1743 {
1744 unsigned char cmd[10];
1745 unsigned long spintime_expire = 0;
1746 int retries, spintime;
1747 unsigned int the_result;
1748 struct scsi_sense_hdr sshdr;
1749 int sense_valid = 0;
1750
1751 spintime = 0;
1752
1753 /* Spin up drives, as required. Only do this at boot time */
1754 /* Spinup needs to be done for module loads too. */
1755 do {
1756 retries = 0;
1757
1758 do {
1759 cmd[0] = TEST_UNIT_READY;
1760 memset((void *) &cmd[1], 0, 9);
1761
1762 the_result = scsi_execute_req(sdkp->device, cmd,
1763 DMA_NONE, NULL, 0,
1764 &sshdr, SD_TIMEOUT,
1765 SD_MAX_RETRIES, NULL);
1766
1767 /*
1768 * If the drive has indicated to us that it
1769 * doesn't have any media in it, don't bother
1770 * with any more polling.
1771 */
1772 /*
1773 if (media_not_present(sdkp, &sshdr))
1774 return;
1775 */
1776
1777 if (the_result)
1778 sense_valid = scsi_sense_valid(&sshdr);
1779 retries++;
1780 if(!scsi_status_is_good(the_result) ||
1781 ((driver_byte(the_result) & DRIVER_SENSE) &&
1782 sense_valid && sshdr.sense_key == UNIT_ATTENTION)) {
1783 msleep(100);
1784 } else {
1785 break;
1786 }
1787 } while (retries < 5);
1788
1789 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1790 /* no sense, TUR either succeeded or failed
1791 * with a status error */
1792 if(!spintime && !scsi_status_is_good(the_result)) {
1793 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1794 sd_print_result(sdkp, the_result);
1795 }
1796 break;
1797 }
1798
1799 /*
1800 * The device does not want the automatic start to be issued.
1801 */
1802 if (sdkp->device->no_start_on_add)
1803 break;
1804
1805 if (sense_valid && sshdr.sense_key == NOT_READY) {
1806 if (sshdr.asc == 4 && sshdr.ascq == 3)
1807 break; /* manual intervention required */
1808 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1809 break; /* standby */
1810 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1811 break; /* unavailable */
1812 /*
1813 * Issue command to spin up drive when not ready
1814 */
1815 if (!spintime) {
1816 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1817 cmd[0] = START_STOP;
1818 cmd[1] = 1; /* Return immediately */
1819 memset((void *) &cmd[2], 0, 8);
1820 cmd[4] = 1; /* Start spin cycle */
1821 if (sdkp->device->start_stop_pwr_cond)
1822 cmd[4] |= 1 << 4;
1823 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1824 NULL, 0, &sshdr,
1825 SD_TIMEOUT, SD_MAX_RETRIES,
1826 NULL);
1827 spintime_expire = jiffies + 100 * HZ;
1828 spintime = 1;
1829 }
1830 /* Wait 1 second for next try */
1831 msleep(1000);
1832 printk(".");
1833
1834 /*
1835 * Wait for USB flash devices with slow firmware.
1836 * Yes, this sense key/ASC combination shouldn't
1837 * occur here. It's characteristic of these devices.
1838 */
1839 } else if (sense_valid &&
1840 sshdr.sense_key == UNIT_ATTENTION &&
1841 sshdr.asc == 0x28) {
1842 if (!spintime) {
1843 spintime_expire = jiffies + 5 * HZ;
1844 spintime = 1;
1845 }
1846 /* Wait 1 second for next try */
1847 msleep(1000);
1848 } else {
1849 /* we don't understand the sense code, so it's
1850 * probably pointless to loop */
1851 if(!spintime) {
1852 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1853 sd_print_sense_hdr(sdkp, &sshdr);
1854 }
1855 break;
1856 }
1857
1858 } while (spintime && time_before_eq(jiffies, spintime_expire));
1859
1860 if (spintime) {
1861 if (scsi_status_is_good(the_result))
1862 printk("ready\n");
1863 else
1864 printk("not responding...\n");
1865 }
1866 }
1867
1868
1869 /*
1870 * Determine whether disk supports Data Integrity Field.
1871 */
1872 static int sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1873 {
1874 struct scsi_device *sdp = sdkp->device;
1875 u8 type;
1876 int ret = 0;
1877
1878 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1879 return ret;
1880
1881 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1882
1883 if (type > SD_DIF_TYPE3_PROTECTION)
1884 ret = -ENODEV;
1885 else if (scsi_host_dif_capable(sdp->host, type))
1886 ret = 1;
1887
1888 if (sdkp->first_scan || type != sdkp->protection_type)
1889 switch (ret) {
1890 case -ENODEV:
1891 sd_printk(KERN_ERR, sdkp, "formatted with unsupported" \
1892 " protection type %u. Disabling disk!\n",
1893 type);
1894 break;
1895 case 1:
1896 sd_printk(KERN_NOTICE, sdkp,
1897 "Enabling DIF Type %u protection\n", type);
1898 break;
1899 case 0:
1900 sd_printk(KERN_NOTICE, sdkp,
1901 "Disabling DIF Type %u protection\n", type);
1902 break;
1903 }
1904
1905 sdkp->protection_type = type;
1906
1907 return ret;
1908 }
1909
1910 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1911 struct scsi_sense_hdr *sshdr, int sense_valid,
1912 int the_result)
1913 {
1914 sd_print_result(sdkp, the_result);
1915 if (driver_byte(the_result) & DRIVER_SENSE)
1916 sd_print_sense_hdr(sdkp, sshdr);
1917 else
1918 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1919
1920 /*
1921 * Set dirty bit for removable devices if not ready -
1922 * sometimes drives will not report this properly.
1923 */
1924 if (sdp->removable &&
1925 sense_valid && sshdr->sense_key == NOT_READY)
1926 set_media_not_present(sdkp);
1927
1928 /*
1929 * We used to set media_present to 0 here to indicate no media
1930 * in the drive, but some drives fail read capacity even with
1931 * media present, so we can't do that.
1932 */
1933 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1934 }
1935
1936 #define RC16_LEN 32
1937 #if RC16_LEN > SD_BUF_SIZE
1938 #error RC16_LEN must not be more than SD_BUF_SIZE
1939 #endif
1940
1941 #define READ_CAPACITY_RETRIES_ON_RESET 10
1942
1943 /*
1944 * Ensure that we don't overflow sector_t when CONFIG_LBDAF is not set
1945 * and the reported logical block size is bigger than 512 bytes. Note
1946 * that last_sector is a u64 and therefore logical_to_sectors() is not
1947 * applicable.
1948 */
1949 static bool sd_addressable_capacity(u64 lba, unsigned int sector_size)
1950 {
1951 u64 last_sector = (lba + 1ULL) << (ilog2(sector_size) - 9);
1952
1953 if (sizeof(sector_t) == 4 && last_sector > U32_MAX)
1954 return false;
1955
1956 return true;
1957 }
1958
1959 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1960 unsigned char *buffer)
1961 {
1962 unsigned char cmd[16];
1963 struct scsi_sense_hdr sshdr;
1964 int sense_valid = 0;
1965 int the_result;
1966 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
1967 unsigned int alignment;
1968 unsigned long long lba;
1969 unsigned sector_size;
1970
1971 if (sdp->no_read_capacity_16)
1972 return -EINVAL;
1973
1974 do {
1975 memset(cmd, 0, 16);
1976 cmd[0] = SERVICE_ACTION_IN;
1977 cmd[1] = SAI_READ_CAPACITY_16;
1978 cmd[13] = RC16_LEN;
1979 memset(buffer, 0, RC16_LEN);
1980
1981 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1982 buffer, RC16_LEN, &sshdr,
1983 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1984
1985 if (media_not_present(sdkp, &sshdr))
1986 return -ENODEV;
1987
1988 if (the_result) {
1989 sense_valid = scsi_sense_valid(&sshdr);
1990 if (sense_valid &&
1991 sshdr.sense_key == ILLEGAL_REQUEST &&
1992 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1993 sshdr.ascq == 0x00)
1994 /* Invalid Command Operation Code or
1995 * Invalid Field in CDB, just retry
1996 * silently with RC10 */
1997 return -EINVAL;
1998 if (sense_valid &&
1999 sshdr.sense_key == UNIT_ATTENTION &&
2000 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2001 /* Device reset might occur several times,
2002 * give it one more chance */
2003 if (--reset_retries > 0)
2004 continue;
2005 }
2006 retries--;
2007
2008 } while (the_result && retries);
2009
2010 if (the_result) {
2011 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
2012 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2013 return -EINVAL;
2014 }
2015
2016 sector_size = get_unaligned_be32(&buffer[8]);
2017 lba = get_unaligned_be64(&buffer[0]);
2018
2019 if (sd_read_protection_type(sdkp, buffer) < 0) {
2020 sdkp->capacity = 0;
2021 return -ENODEV;
2022 }
2023
2024 if (!sd_addressable_capacity(lba, sector_size)) {
2025 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2026 "kernel compiled with support for large block "
2027 "devices.\n");
2028 sdkp->capacity = 0;
2029 return -EOVERFLOW;
2030 }
2031
2032 /* Logical blocks per physical block exponent */
2033 sdkp->physical_block_size = (1 << (buffer[13] & 0xf)) * sector_size;
2034
2035 /* Lowest aligned logical block */
2036 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
2037 blk_queue_alignment_offset(sdp->request_queue, alignment);
2038 if (alignment && sdkp->first_scan)
2039 sd_printk(KERN_NOTICE, sdkp,
2040 "physical block alignment offset: %u\n", alignment);
2041
2042 if (buffer[14] & 0x80) { /* LBPME */
2043 sdkp->lbpme = 1;
2044
2045 if (buffer[14] & 0x40) /* LBPRZ */
2046 sdkp->lbprz = 1;
2047
2048 sd_config_discard(sdkp, SD_LBP_WS16);
2049 }
2050
2051 sdkp->capacity = lba + 1;
2052 return sector_size;
2053 }
2054
2055 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
2056 unsigned char *buffer)
2057 {
2058 unsigned char cmd[16];
2059 struct scsi_sense_hdr sshdr;
2060 int sense_valid = 0;
2061 int the_result;
2062 int retries = 3, reset_retries = READ_CAPACITY_RETRIES_ON_RESET;
2063 sector_t lba;
2064 unsigned sector_size;
2065
2066 do {
2067 cmd[0] = READ_CAPACITY;
2068 memset(&cmd[1], 0, 9);
2069 memset(buffer, 0, 8);
2070
2071 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
2072 buffer, 8, &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 == UNIT_ATTENTION &&
2082 sshdr.asc == 0x29 && sshdr.ascq == 0x00)
2083 /* Device reset might occur several times,
2084 * give it one more chance */
2085 if (--reset_retries > 0)
2086 continue;
2087 }
2088 retries--;
2089
2090 } while (the_result && retries);
2091
2092 if (the_result) {
2093 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
2094 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
2095 return -EINVAL;
2096 }
2097
2098 sector_size = get_unaligned_be32(&buffer[4]);
2099 lba = get_unaligned_be32(&buffer[0]);
2100
2101 if (sdp->no_read_capacity_16 && (lba == 0xffffffff)) {
2102 /* Some buggy (usb cardreader) devices return an lba of
2103 0xffffffff when the want to report a size of 0 (with
2104 which they really mean no media is present) */
2105 sdkp->capacity = 0;
2106 sdkp->physical_block_size = sector_size;
2107 return sector_size;
2108 }
2109
2110 if (!sd_addressable_capacity(lba, sector_size)) {
2111 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
2112 "kernel compiled with support for large block "
2113 "devices.\n");
2114 sdkp->capacity = 0;
2115 return -EOVERFLOW;
2116 }
2117
2118 sdkp->capacity = lba + 1;
2119 sdkp->physical_block_size = sector_size;
2120 return sector_size;
2121 }
2122
2123 static int sd_try_rc16_first(struct scsi_device *sdp)
2124 {
2125 if (sdp->host->max_cmd_len < 16)
2126 return 0;
2127 if (sdp->try_rc_10_first)
2128 return 0;
2129 if (sdp->scsi_level > SCSI_SPC_2)
2130 return 1;
2131 if (scsi_device_protection(sdp))
2132 return 1;
2133 return 0;
2134 }
2135
2136 /*
2137 * read disk capacity
2138 */
2139 static void
2140 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
2141 {
2142 int sector_size;
2143 struct scsi_device *sdp = sdkp->device;
2144 sector_t old_capacity = sdkp->capacity;
2145
2146 if (sd_try_rc16_first(sdp)) {
2147 sector_size = read_capacity_16(sdkp, sdp, buffer);
2148 if (sector_size == -EOVERFLOW)
2149 goto got_data;
2150 if (sector_size == -ENODEV)
2151 return;
2152 if (sector_size < 0)
2153 sector_size = read_capacity_10(sdkp, sdp, buffer);
2154 if (sector_size < 0)
2155 return;
2156 } else {
2157 sector_size = read_capacity_10(sdkp, sdp, buffer);
2158 if (sector_size == -EOVERFLOW)
2159 goto got_data;
2160 if (sector_size < 0)
2161 return;
2162 if ((sizeof(sdkp->capacity) > 4) &&
2163 (sdkp->capacity > 0xffffffffULL)) {
2164 int old_sector_size = sector_size;
2165 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
2166 "Trying to use READ CAPACITY(16).\n");
2167 sector_size = read_capacity_16(sdkp, sdp, buffer);
2168 if (sector_size < 0) {
2169 sd_printk(KERN_NOTICE, sdkp,
2170 "Using 0xffffffff as device size\n");
2171 sdkp->capacity = 1 + (sector_t) 0xffffffff;
2172 sector_size = old_sector_size;
2173 goto got_data;
2174 }
2175 }
2176 }
2177
2178 /* Some devices are known to return the total number of blocks,
2179 * not the highest block number. Some devices have versions
2180 * which do this and others which do not. Some devices we might
2181 * suspect of doing this but we don't know for certain.
2182 *
2183 * If we know the reported capacity is wrong, decrement it. If
2184 * we can only guess, then assume the number of blocks is even
2185 * (usually true but not always) and err on the side of lowering
2186 * the capacity.
2187 */
2188 if (sdp->fix_capacity ||
2189 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
2190 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
2191 "from its reported value: %llu\n",
2192 (unsigned long long) sdkp->capacity);
2193 --sdkp->capacity;
2194 }
2195
2196 got_data:
2197 if (sector_size == 0) {
2198 sector_size = 512;
2199 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
2200 "assuming 512.\n");
2201 }
2202
2203 if (sector_size != 512 &&
2204 sector_size != 1024 &&
2205 sector_size != 2048 &&
2206 sector_size != 4096 &&
2207 sector_size != 256) {
2208 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
2209 sector_size);
2210 /*
2211 * The user might want to re-format the drive with
2212 * a supported sectorsize. Once this happens, it
2213 * would be relatively trivial to set the thing up.
2214 * For this reason, we leave the thing in the table.
2215 */
2216 sdkp->capacity = 0;
2217 /*
2218 * set a bogus sector size so the normal read/write
2219 * logic in the block layer will eventually refuse any
2220 * request on this device without tripping over power
2221 * of two sector size assumptions
2222 */
2223 sector_size = 512;
2224 }
2225 blk_queue_logical_block_size(sdp->request_queue, sector_size);
2226
2227 {
2228 char cap_str_2[10], cap_str_10[10];
2229 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
2230
2231 string_get_size(sz, STRING_UNITS_2, cap_str_2,
2232 sizeof(cap_str_2));
2233 string_get_size(sz, STRING_UNITS_10, cap_str_10,
2234 sizeof(cap_str_10));
2235
2236 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
2237 sd_printk(KERN_NOTICE, sdkp,
2238 "%llu %d-byte logical blocks: (%s/%s)\n",
2239 (unsigned long long)sdkp->capacity,
2240 sector_size, cap_str_10, cap_str_2);
2241
2242 if (sdkp->physical_block_size != sector_size)
2243 sd_printk(KERN_NOTICE, sdkp,
2244 "%u-byte physical blocks\n",
2245 sdkp->physical_block_size);
2246 }
2247 }
2248
2249 sdp->use_16_for_rw = (sdkp->capacity > 0xffffffff);
2250
2251 /* Rescale capacity to 512-byte units */
2252 if (sector_size == 4096)
2253 sdkp->capacity <<= 3;
2254 else if (sector_size == 2048)
2255 sdkp->capacity <<= 2;
2256 else if (sector_size == 1024)
2257 sdkp->capacity <<= 1;
2258 else if (sector_size == 256)
2259 sdkp->capacity >>= 1;
2260
2261 blk_queue_physical_block_size(sdp->request_queue,
2262 sdkp->physical_block_size);
2263 sdkp->device->sector_size = sector_size;
2264 }
2265
2266 /* called with buffer of length 512 */
2267 static inline int
2268 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
2269 unsigned char *buffer, int len, struct scsi_mode_data *data,
2270 struct scsi_sense_hdr *sshdr)
2271 {
2272 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
2273 SD_TIMEOUT, SD_MAX_RETRIES, data,
2274 sshdr);
2275 }
2276
2277 /*
2278 * read write protect setting, if possible - called only in sd_revalidate_disk()
2279 * called with buffer of length SD_BUF_SIZE
2280 */
2281 static void
2282 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
2283 {
2284 int res;
2285 struct scsi_device *sdp = sdkp->device;
2286 struct scsi_mode_data data;
2287 int old_wp = sdkp->write_prot;
2288
2289 set_disk_ro(sdkp->disk, 0);
2290 if (sdp->skip_ms_page_3f) {
2291 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
2292 return;
2293 }
2294
2295 if (sdp->use_192_bytes_for_3f) {
2296 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
2297 } else {
2298 /*
2299 * First attempt: ask for all pages (0x3F), but only 4 bytes.
2300 * We have to start carefully: some devices hang if we ask
2301 * for more than is available.
2302 */
2303 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
2304
2305 /*
2306 * Second attempt: ask for page 0 When only page 0 is
2307 * implemented, a request for page 3F may return Sense Key
2308 * 5: Illegal Request, Sense Code 24: Invalid field in
2309 * CDB.
2310 */
2311 if (!scsi_status_is_good(res))
2312 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
2313
2314 /*
2315 * Third attempt: ask 255 bytes, as we did earlier.
2316 */
2317 if (!scsi_status_is_good(res))
2318 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
2319 &data, NULL);
2320 }
2321
2322 if (!scsi_status_is_good(res)) {
2323 sd_printk(KERN_WARNING, sdkp,
2324 "Test WP failed, assume Write Enabled\n");
2325 } else {
2326 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
2327 set_disk_ro(sdkp->disk, sdkp->write_prot);
2328 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
2329 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
2330 sdkp->write_prot ? "on" : "off");
2331 sd_printk(KERN_DEBUG, sdkp,
2332 "Mode Sense: %02x %02x %02x %02x\n",
2333 buffer[0], buffer[1], buffer[2], buffer[3]);
2334 }
2335 }
2336 }
2337
2338 /*
2339 * sd_read_cache_type - called only from sd_revalidate_disk()
2340 * called with buffer of length SD_BUF_SIZE
2341 */
2342 static void
2343 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
2344 {
2345 int len = 0, res;
2346 struct scsi_device *sdp = sdkp->device;
2347
2348 int dbd;
2349 int modepage;
2350 int first_len;
2351 struct scsi_mode_data data;
2352 struct scsi_sense_hdr sshdr;
2353 int old_wce = sdkp->WCE;
2354 int old_rcd = sdkp->RCD;
2355 int old_dpofua = sdkp->DPOFUA;
2356
2357
2358 if (sdkp->cache_override)
2359 return;
2360
2361 first_len = 4;
2362 if (sdp->skip_ms_page_8) {
2363 if (sdp->type == TYPE_RBC)
2364 goto defaults;
2365 else {
2366 if (sdp->skip_ms_page_3f)
2367 goto defaults;
2368 modepage = 0x3F;
2369 if (sdp->use_192_bytes_for_3f)
2370 first_len = 192;
2371 dbd = 0;
2372 }
2373 } else if (sdp->type == TYPE_RBC) {
2374 modepage = 6;
2375 dbd = 8;
2376 } else {
2377 modepage = 8;
2378 dbd = 0;
2379 }
2380
2381 /* cautiously ask */
2382 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, first_len,
2383 &data, &sshdr);
2384
2385 if (!scsi_status_is_good(res))
2386 goto bad_sense;
2387
2388 if (!data.header_length) {
2389 modepage = 6;
2390 first_len = 0;
2391 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
2392 }
2393
2394 /* that went OK, now ask for the proper length */
2395 len = data.length;
2396
2397 /*
2398 * We're only interested in the first three bytes, actually.
2399 * But the data cache page is defined for the first 20.
2400 */
2401 if (len < 3)
2402 goto bad_sense;
2403 else if (len > SD_BUF_SIZE) {
2404 sd_printk(KERN_NOTICE, sdkp, "Truncating mode parameter "
2405 "data from %d to %d bytes\n", len, SD_BUF_SIZE);
2406 len = SD_BUF_SIZE;
2407 }
2408 if (modepage == 0x3F && sdp->use_192_bytes_for_3f)
2409 len = 192;
2410
2411 /* Get the data */
2412 if (len > first_len)
2413 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len,
2414 &data, &sshdr);
2415
2416 if (scsi_status_is_good(res)) {
2417 int offset = data.header_length + data.block_descriptor_length;
2418
2419 while (offset < len) {
2420 u8 page_code = buffer[offset] & 0x3F;
2421 u8 spf = buffer[offset] & 0x40;
2422
2423 if (page_code == 8 || page_code == 6) {
2424 /* We're interested only in the first 3 bytes.
2425 */
2426 if (len - offset <= 2) {
2427 sd_printk(KERN_ERR, sdkp, "Incomplete "
2428 "mode parameter data\n");
2429 goto defaults;
2430 } else {
2431 modepage = page_code;
2432 goto Page_found;
2433 }
2434 } else {
2435 /* Go to the next page */
2436 if (spf && len - offset > 3)
2437 offset += 4 + (buffer[offset+2] << 8) +
2438 buffer[offset+3];
2439 else if (!spf && len - offset > 1)
2440 offset += 2 + buffer[offset+1];
2441 else {
2442 sd_printk(KERN_ERR, sdkp, "Incomplete "
2443 "mode parameter data\n");
2444 goto defaults;
2445 }
2446 }
2447 }
2448
2449 sd_printk(KERN_ERR, sdkp, "No Caching mode page found\n");
2450 goto defaults;
2451
2452 Page_found:
2453 if (modepage == 8) {
2454 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
2455 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
2456 } else {
2457 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
2458 sdkp->RCD = 0;
2459 }
2460
2461 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
2462 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
2463 sd_printk(KERN_NOTICE, sdkp,
2464 "Uses READ/WRITE(6), disabling FUA\n");
2465 sdkp->DPOFUA = 0;
2466 }
2467
2468 if (sdkp->first_scan || old_wce != sdkp->WCE ||
2469 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
2470 sd_printk(KERN_NOTICE, sdkp,
2471 "Write cache: %s, read cache: %s, %s\n",
2472 sdkp->WCE ? "enabled" : "disabled",
2473 sdkp->RCD ? "disabled" : "enabled",
2474 sdkp->DPOFUA ? "supports DPO and FUA"
2475 : "doesn't support DPO or FUA");
2476
2477 return;
2478 }
2479
2480 bad_sense:
2481 if (scsi_sense_valid(&sshdr) &&
2482 sshdr.sense_key == ILLEGAL_REQUEST &&
2483 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
2484 /* Invalid field in CDB */
2485 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
2486 else
2487 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
2488
2489 defaults:
2490 if (sdp->wce_default_on) {
2491 sd_printk(KERN_NOTICE, sdkp, "Assuming drive cache: write back\n");
2492 sdkp->WCE = 1;
2493 } else {
2494 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
2495 sdkp->WCE = 0;
2496 }
2497 sdkp->RCD = 0;
2498 sdkp->DPOFUA = 0;
2499 }
2500
2501 /*
2502 * The ATO bit indicates whether the DIF application tag is available
2503 * for use by the operating system.
2504 */
2505 static void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
2506 {
2507 int res, offset;
2508 struct scsi_device *sdp = sdkp->device;
2509 struct scsi_mode_data data;
2510 struct scsi_sense_hdr sshdr;
2511
2512 if (sdp->type != TYPE_DISK)
2513 return;
2514
2515 if (sdkp->protection_type == 0)
2516 return;
2517
2518 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
2519 SD_MAX_RETRIES, &data, &sshdr);
2520
2521 if (!scsi_status_is_good(res) || !data.header_length ||
2522 data.length < 6) {
2523 sd_printk(KERN_WARNING, sdkp,
2524 "getting Control mode page failed, assume no ATO\n");
2525
2526 if (scsi_sense_valid(&sshdr))
2527 sd_print_sense_hdr(sdkp, &sshdr);
2528
2529 return;
2530 }
2531
2532 offset = data.header_length + data.block_descriptor_length;
2533
2534 if ((buffer[offset] & 0x3f) != 0x0a) {
2535 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
2536 return;
2537 }
2538
2539 if ((buffer[offset + 5] & 0x80) == 0)
2540 return;
2541
2542 sdkp->ATO = 1;
2543
2544 return;
2545 }
2546
2547 /**
2548 * sd_read_block_limits - Query disk device for preferred I/O sizes.
2549 * @disk: disk to query
2550 */
2551 static void sd_read_block_limits(struct scsi_disk *sdkp)
2552 {
2553 unsigned int sector_sz = sdkp->device->sector_size;
2554 const int vpd_len = 64;
2555 unsigned char *buffer = kmalloc(vpd_len, GFP_KERNEL);
2556
2557 if (!buffer ||
2558 /* Block Limits VPD */
2559 scsi_get_vpd_page(sdkp->device, 0xb0, buffer, vpd_len))
2560 goto out;
2561
2562 blk_queue_io_min(sdkp->disk->queue,
2563 get_unaligned_be16(&buffer[6]) * sector_sz);
2564 blk_queue_io_opt(sdkp->disk->queue,
2565 get_unaligned_be32(&buffer[12]) * sector_sz);
2566
2567 if (buffer[3] == 0x3c) {
2568 unsigned int lba_count, desc_count;
2569
2570 sdkp->max_ws_blocks = (u32)get_unaligned_be64(&buffer[36]);
2571
2572 if (!sdkp->lbpme)
2573 goto out;
2574
2575 lba_count = get_unaligned_be32(&buffer[20]);
2576 desc_count = get_unaligned_be32(&buffer[24]);
2577
2578 if (lba_count && desc_count)
2579 sdkp->max_unmap_blocks = lba_count;
2580
2581 sdkp->unmap_granularity = get_unaligned_be32(&buffer[28]);
2582
2583 if (buffer[32] & 0x80)
2584 sdkp->unmap_alignment =
2585 get_unaligned_be32(&buffer[32]) & ~(1 << 31);
2586
2587 if (!sdkp->lbpvpd) { /* LBP VPD page not provided */
2588
2589 if (sdkp->max_unmap_blocks)
2590 sd_config_discard(sdkp, SD_LBP_UNMAP);
2591 else
2592 sd_config_discard(sdkp, SD_LBP_WS16);
2593
2594 } else { /* LBP VPD page tells us what to use */
2595
2596 if (sdkp->lbpu && sdkp->max_unmap_blocks)
2597 sd_config_discard(sdkp, SD_LBP_UNMAP);
2598 else if (sdkp->lbpws)
2599 sd_config_discard(sdkp, SD_LBP_WS16);
2600 else if (sdkp->lbpws10)
2601 sd_config_discard(sdkp, SD_LBP_WS10);
2602 else
2603 sd_config_discard(sdkp, SD_LBP_DISABLE);
2604 }
2605 }
2606
2607 out:
2608 kfree(buffer);
2609 }
2610
2611 /**
2612 * sd_read_block_characteristics - Query block dev. characteristics
2613 * @disk: disk to query
2614 */
2615 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
2616 {
2617 unsigned char *buffer;
2618 u16 rot;
2619 const int vpd_len = 64;
2620
2621 buffer = kmalloc(vpd_len, GFP_KERNEL);
2622
2623 if (!buffer ||
2624 /* Block Device Characteristics VPD */
2625 scsi_get_vpd_page(sdkp->device, 0xb1, buffer, vpd_len))
2626 goto out;
2627
2628 rot = get_unaligned_be16(&buffer[4]);
2629
2630 if (rot == 1)
2631 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
2632
2633 out:
2634 kfree(buffer);
2635 }
2636
2637 /**
2638 * sd_read_block_provisioning - Query provisioning VPD page
2639 * @disk: disk to query
2640 */
2641 static void sd_read_block_provisioning(struct scsi_disk *sdkp)
2642 {
2643 unsigned char *buffer;
2644 const int vpd_len = 8;
2645
2646 if (sdkp->lbpme == 0)
2647 return;
2648
2649 buffer = kmalloc(vpd_len, GFP_KERNEL);
2650
2651 if (!buffer || scsi_get_vpd_page(sdkp->device, 0xb2, buffer, vpd_len))
2652 goto out;
2653
2654 sdkp->lbpvpd = 1;
2655 sdkp->lbpu = (buffer[5] >> 7) & 1; /* UNMAP */
2656 sdkp->lbpws = (buffer[5] >> 6) & 1; /* WRITE SAME(16) with UNMAP */
2657 sdkp->lbpws10 = (buffer[5] >> 5) & 1; /* WRITE SAME(10) with UNMAP */
2658
2659 out:
2660 kfree(buffer);
2661 }
2662
2663 static void sd_read_write_same(struct scsi_disk *sdkp, unsigned char *buffer)
2664 {
2665 struct scsi_device *sdev = sdkp->device;
2666
2667 if (sdev->host->no_write_same) {
2668 sdev->no_write_same = 1;
2669
2670 return;
2671 }
2672
2673 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, INQUIRY) < 0) {
2674 /* too large values might cause issues with arcmsr */
2675 int vpd_buf_len = 64;
2676
2677 sdev->no_report_opcodes = 1;
2678
2679 /* Disable WRITE SAME if REPORT SUPPORTED OPERATION
2680 * CODES is unsupported and the device has an ATA
2681 * Information VPD page (SAT).
2682 */
2683 if (!scsi_get_vpd_page(sdev, 0x89, buffer, vpd_buf_len))
2684 sdev->no_write_same = 1;
2685 }
2686
2687 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME_16) == 1)
2688 sdkp->ws16 = 1;
2689
2690 if (scsi_report_opcode(sdev, buffer, SD_BUF_SIZE, WRITE_SAME) == 1)
2691 sdkp->ws10 = 1;
2692 }
2693
2694 static int sd_try_extended_inquiry(struct scsi_device *sdp)
2695 {
2696 /*
2697 * Although VPD inquiries can go to SCSI-2 type devices,
2698 * some USB ones crash on receiving them, and the pages
2699 * we currently ask for are for SPC-3 and beyond
2700 */
2701 if (sdp->scsi_level > SCSI_SPC_2 && !sdp->skip_vpd_pages)
2702 return 1;
2703 return 0;
2704 }
2705
2706 /**
2707 * sd_revalidate_disk - called the first time a new disk is seen,
2708 * performs disk spin up, read_capacity, etc.
2709 * @disk: struct gendisk we care about
2710 **/
2711 static int sd_revalidate_disk(struct gendisk *disk)
2712 {
2713 struct scsi_disk *sdkp = scsi_disk(disk);
2714 struct scsi_device *sdp = sdkp->device;
2715 unsigned char *buffer;
2716 unsigned flush = 0;
2717
2718 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
2719 "sd_revalidate_disk\n"));
2720
2721 /*
2722 * If the device is offline, don't try and read capacity or any
2723 * of the other niceties.
2724 */
2725 if (!scsi_device_online(sdp))
2726 goto out;
2727
2728 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
2729 if (!buffer) {
2730 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
2731 "allocation failure.\n");
2732 goto out;
2733 }
2734
2735 sd_spinup_disk(sdkp);
2736
2737 /*
2738 * Without media there is no reason to ask; moreover, some devices
2739 * react badly if we do.
2740 */
2741 if (sdkp->media_present) {
2742 sd_read_capacity(sdkp, buffer);
2743
2744 if (sd_try_extended_inquiry(sdp)) {
2745 sd_read_block_provisioning(sdkp);
2746 sd_read_block_limits(sdkp);
2747 sd_read_block_characteristics(sdkp);
2748 }
2749
2750 sd_read_write_protect_flag(sdkp, buffer);
2751 sd_read_cache_type(sdkp, buffer);
2752 sd_read_app_tag_own(sdkp, buffer);
2753 sd_read_write_same(sdkp, buffer);
2754 }
2755
2756 sdkp->first_scan = 0;
2757
2758 /*
2759 * We now have all cache related info, determine how we deal
2760 * with flush requests.
2761 */
2762 if (sdkp->WCE) {
2763 flush |= REQ_FLUSH;
2764 if (sdkp->DPOFUA)
2765 flush |= REQ_FUA;
2766 }
2767
2768 blk_queue_flush(sdkp->disk->queue, flush);
2769
2770 set_capacity(disk, sdkp->capacity);
2771 sd_config_write_same(sdkp);
2772 kfree(buffer);
2773
2774 out:
2775 return 0;
2776 }
2777
2778 /**
2779 * sd_unlock_native_capacity - unlock native capacity
2780 * @disk: struct gendisk to set capacity for
2781 *
2782 * Block layer calls this function if it detects that partitions
2783 * on @disk reach beyond the end of the device. If the SCSI host
2784 * implements ->unlock_native_capacity() method, it's invoked to
2785 * give it a chance to adjust the device capacity.
2786 *
2787 * CONTEXT:
2788 * Defined by block layer. Might sleep.
2789 */
2790 static void sd_unlock_native_capacity(struct gendisk *disk)
2791 {
2792 struct scsi_device *sdev = scsi_disk(disk)->device;
2793
2794 if (sdev->host->hostt->unlock_native_capacity)
2795 sdev->host->hostt->unlock_native_capacity(sdev);
2796 }
2797
2798 /**
2799 * sd_format_disk_name - format disk name
2800 * @prefix: name prefix - ie. "sd" for SCSI disks
2801 * @index: index of the disk to format name for
2802 * @buf: output buffer
2803 * @buflen: length of the output buffer
2804 *
2805 * SCSI disk names starts at sda. The 26th device is sdz and the
2806 * 27th is sdaa. The last one for two lettered suffix is sdzz
2807 * which is followed by sdaaa.
2808 *
2809 * This is basically 26 base counting with one extra 'nil' entry
2810 * at the beginning from the second digit on and can be
2811 * determined using similar method as 26 base conversion with the
2812 * index shifted -1 after each digit is computed.
2813 *
2814 * CONTEXT:
2815 * Don't care.
2816 *
2817 * RETURNS:
2818 * 0 on success, -errno on failure.
2819 */
2820 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
2821 {
2822 const int base = 'z' - 'a' + 1;
2823 char *begin = buf + strlen(prefix);
2824 char *end = buf + buflen;
2825 char *p;
2826 int unit;
2827
2828 p = end - 1;
2829 *p = '\0';
2830 unit = base;
2831 do {
2832 if (p == begin)
2833 return -EINVAL;
2834 *--p = 'a' + (index % unit);
2835 index = (index / unit) - 1;
2836 } while (index >= 0);
2837
2838 memmove(begin, p, end - p);
2839 memcpy(buf, prefix, strlen(prefix));
2840
2841 return 0;
2842 }
2843
2844 /*
2845 * The asynchronous part of sd_probe
2846 */
2847 static void sd_probe_async(void *data, async_cookie_t cookie)
2848 {
2849 struct scsi_disk *sdkp = data;
2850 struct scsi_device *sdp;
2851 struct gendisk *gd;
2852 u32 index;
2853 struct device *dev;
2854
2855 sdp = sdkp->device;
2856 gd = sdkp->disk;
2857 index = sdkp->index;
2858 dev = &sdp->sdev_gendev;
2859
2860 gd->major = sd_major((index & 0xf0) >> 4);
2861 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
2862 gd->minors = SD_MINORS;
2863
2864 gd->fops = &sd_fops;
2865 gd->private_data = &sdkp->driver;
2866 gd->queue = sdkp->device->request_queue;
2867
2868 /* defaults, until the device tells us otherwise */
2869 sdp->sector_size = 512;
2870 sdkp->capacity = 0;
2871 sdkp->media_present = 1;
2872 sdkp->write_prot = 0;
2873 sdkp->cache_override = 0;
2874 sdkp->WCE = 0;
2875 sdkp->RCD = 0;
2876 sdkp->ATO = 0;
2877 sdkp->first_scan = 1;
2878 sdkp->max_medium_access_timeouts = SD_MAX_MEDIUM_TIMEOUTS;
2879
2880 sd_revalidate_disk(gd);
2881 #ifdef CONFIG_MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT
2882 sdkp->old_media_present = sdkp->media_present; //add for sdcard hotplug
2883 #endif
2884
2885 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
2886 blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
2887
2888 gd->driverfs_dev = &sdp->sdev_gendev;
2889 gd->flags = GENHD_FL_EXT_DEVT;
2890 if (sdp->removable) {
2891 gd->flags |= GENHD_FL_REMOVABLE;
2892 #ifdef CONFIG_MTK_MULTI_PARTITION_MOUNT_ONLY_SUPPORT
2893 gd->events |= DISK_EVENT_MEDIA_CHANGE|DISK_EVENT_MEDIA_DISAPPEAR; //add for sdcard hotplug
2894 #else
2895 gd->events |= DISK_EVENT_MEDIA_CHANGE;
2896 #endif
2897 }
2898
2899 blk_pm_runtime_init(sdp->request_queue, dev);
2900 add_disk(gd);
2901 if (sdkp->capacity)
2902 sd_dif_config_host(sdkp);
2903
2904 sd_revalidate_disk(gd);
2905
2906 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2907 sdp->removable ? "removable " : "");
2908 scsi_autopm_put_device(sdp);
2909 put_device(&sdkp->dev);
2910 }
2911
2912 /**
2913 * sd_probe - called during driver initialization and whenever a
2914 * new scsi device is attached to the system. It is called once
2915 * for each scsi device (not just disks) present.
2916 * @dev: pointer to device object
2917 *
2918 * Returns 0 if successful (or not interested in this scsi device
2919 * (e.g. scanner)); 1 when there is an error.
2920 *
2921 * Note: this function is invoked from the scsi mid-level.
2922 * This function sets up the mapping between a given
2923 * <host,channel,id,lun> (found in sdp) and new device name
2924 * (e.g. /dev/sda). More precisely it is the block device major
2925 * and minor number that is chosen here.
2926 *
2927 * Assume sd_probe is not re-entrant (for time being)
2928 * Also think about sd_probe() and sd_remove() running coincidentally.
2929 **/
2930 static int sd_probe(struct device *dev)
2931 {
2932 struct scsi_device *sdp = to_scsi_device(dev);
2933 struct scsi_disk *sdkp;
2934 struct gendisk *gd;
2935 int index;
2936 int error;
2937
2938 error = -ENODEV;
2939 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2940 goto out;
2941
2942 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2943 "sd_probe\n"));
2944
2945 error = -ENOMEM;
2946 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2947 if (!sdkp)
2948 goto out;
2949
2950 gd = alloc_disk(SD_MINORS);
2951 if (!gd)
2952 goto out_free;
2953
2954 do {
2955 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2956 goto out_put;
2957
2958 spin_lock(&sd_index_lock);
2959 error = ida_get_new(&sd_index_ida, &index);
2960 spin_unlock(&sd_index_lock);
2961 } while (error == -EAGAIN);
2962
2963 if (error) {
2964 sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
2965 goto out_put;
2966 }
2967
2968 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2969 if (error) {
2970 sdev_printk(KERN_WARNING, sdp, "SCSI disk (sd) name length exceeded.\n");
2971 goto out_free_index;
2972 }
2973
2974 sdkp->device = sdp;
2975 sdkp->driver = &sd_template;
2976 sdkp->disk = gd;
2977 sdkp->index = index;
2978 atomic_set(&sdkp->openers, 0);
2979 atomic_set(&sdkp->device->ioerr_cnt, 0);
2980
2981 if (!sdp->request_queue->rq_timeout) {
2982 if (sdp->type != TYPE_MOD)
2983 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2984 else
2985 blk_queue_rq_timeout(sdp->request_queue,
2986 SD_MOD_TIMEOUT);
2987 }
2988
2989 device_initialize(&sdkp->dev);
2990 sdkp->dev.parent = dev;
2991 sdkp->dev.class = &sd_disk_class;
2992 dev_set_name(&sdkp->dev, dev_name(dev));
2993
2994 if (device_add(&sdkp->dev))
2995 goto out_free_index;
2996
2997 get_device(dev);
2998 dev_set_drvdata(dev, sdkp);
2999
3000 get_device(&sdkp->dev); /* prevent release before async_schedule */
3001 async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
3002
3003 return 0;
3004
3005 out_free_index:
3006 spin_lock(&sd_index_lock);
3007 ida_remove(&sd_index_ida, index);
3008 spin_unlock(&sd_index_lock);
3009 out_put:
3010 put_disk(gd);
3011 out_free:
3012 kfree(sdkp);
3013 out:
3014 return error;
3015 }
3016
3017 /**
3018 * sd_remove - called whenever a scsi disk (previously recognized by
3019 * sd_probe) is detached from the system. It is called (potentially
3020 * multiple times) during sd module unload.
3021 * @sdp: pointer to mid level scsi device object
3022 *
3023 * Note: this function is invoked from the scsi mid-level.
3024 * This function potentially frees up a device name (e.g. /dev/sdc)
3025 * that could be re-used by a subsequent sd_probe().
3026 * This function is not called when the built-in sd driver is "exit-ed".
3027 **/
3028 static int sd_remove(struct device *dev)
3029 {
3030 struct scsi_disk *sdkp;
3031
3032 sdkp = dev_get_drvdata(dev);
3033 scsi_autopm_get_device(sdkp->device);
3034
3035 async_synchronize_full_domain(&scsi_sd_probe_domain);
3036 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
3037 blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
3038 device_del(&sdkp->dev);
3039 del_gendisk(sdkp->disk);
3040 sd_shutdown(dev);
3041
3042 mutex_lock(&sd_ref_mutex);
3043 dev_set_drvdata(dev, NULL);
3044 put_device(&sdkp->dev);
3045 mutex_unlock(&sd_ref_mutex);
3046
3047 return 0;
3048 }
3049
3050 /**
3051 * scsi_disk_release - Called to free the scsi_disk structure
3052 * @dev: pointer to embedded class device
3053 *
3054 * sd_ref_mutex must be held entering this routine. Because it is
3055 * called on last put, you should always use the scsi_disk_get()
3056 * scsi_disk_put() helpers which manipulate the semaphore directly
3057 * and never do a direct put_device.
3058 **/
3059 static void scsi_disk_release(struct device *dev)
3060 {
3061 struct scsi_disk *sdkp = to_scsi_disk(dev);
3062 struct gendisk *disk = sdkp->disk;
3063
3064 spin_lock(&sd_index_lock);
3065 ida_remove(&sd_index_ida, sdkp->index);
3066 spin_unlock(&sd_index_lock);
3067
3068 disk->private_data = NULL;
3069 put_disk(disk);
3070 put_device(&sdkp->device->sdev_gendev);
3071
3072 kfree(sdkp);
3073 }
3074
3075 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
3076 {
3077 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
3078 struct scsi_sense_hdr sshdr;
3079 struct scsi_device *sdp = sdkp->device;
3080 int res;
3081
3082 if (start)
3083 cmd[4] |= 1; /* START */
3084
3085 if (sdp->start_stop_pwr_cond)
3086 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
3087
3088 if (!scsi_device_online(sdp))
3089 return -ENODEV;
3090
3091 res = scsi_execute_req_flags(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
3092 SD_TIMEOUT, SD_MAX_RETRIES, NULL, REQ_PM);
3093 if (res) {
3094 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
3095 sd_print_result(sdkp, res);
3096 if (driver_byte(res) & DRIVER_SENSE)
3097 sd_print_sense_hdr(sdkp, &sshdr);
3098 }
3099
3100 return res;
3101 }
3102
3103 /*
3104 * Send a SYNCHRONIZE CACHE instruction down to the device through
3105 * the normal SCSI command structure. Wait for the command to
3106 * complete.
3107 */
3108 static void sd_shutdown(struct device *dev)
3109 {
3110 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3111
3112 if (!sdkp)
3113 return; /* this can happen */
3114
3115 if (pm_runtime_suspended(dev))
3116 goto exit;
3117
3118 if (sdkp->WCE) {
3119 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3120 sd_sync_cache(sdkp);
3121 }
3122
3123 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
3124 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3125 sd_start_stop_device(sdkp, 0);
3126 }
3127
3128 exit:
3129 scsi_disk_put(sdkp);
3130 }
3131
3132 static int sd_suspend(struct device *dev)
3133 {
3134 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3135 int ret = 0;
3136
3137 if (!sdkp) /* E.g.: runtime suspend following sd_remove() */
3138 return 0;
3139
3140 if (sdkp->WCE) {
3141 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
3142 ret = sd_sync_cache(sdkp);
3143 if (ret)
3144 goto done;
3145 }
3146
3147 if (sdkp->device->manage_start_stop) {
3148 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
3149 ret = sd_start_stop_device(sdkp, 0);
3150 }
3151
3152 done:
3153 scsi_disk_put(sdkp);
3154 return ret;
3155 }
3156
3157 static int sd_resume(struct device *dev)
3158 {
3159 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
3160 int ret = 0;
3161
3162 if (!sdkp) /* E.g.: runtime resume at the start of sd_probe() */
3163 return 0;
3164
3165 if (!sdkp->device->manage_start_stop)
3166 goto done;
3167
3168 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
3169 ret = sd_start_stop_device(sdkp, 1);
3170
3171 done:
3172 scsi_disk_put(sdkp);
3173 return ret;
3174 }
3175
3176 /**
3177 * init_sd - entry point for this driver (both when built in or when
3178 * a module).
3179 *
3180 * Note: this function registers this driver with the scsi mid-level.
3181 **/
3182 static int __init init_sd(void)
3183 {
3184 int majors = 0, i, err;
3185
3186 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
3187
3188 for (i = 0; i < SD_MAJORS; i++)
3189 if (register_blkdev(sd_major(i), "sd") == 0)
3190 majors++;
3191
3192 if (!majors)
3193 return -ENODEV;
3194
3195 err = class_register(&sd_disk_class);
3196 if (err)
3197 goto err_out;
3198
3199 sd_cdb_cache = kmem_cache_create("sd_ext_cdb", SD_EXT_CDB_SIZE,
3200 0, 0, NULL);
3201 if (!sd_cdb_cache) {
3202 printk(KERN_ERR "sd: can't init extended cdb cache\n");
3203 goto err_out_class;
3204 }
3205
3206 sd_cdb_pool = mempool_create_slab_pool(SD_MEMPOOL_SIZE, sd_cdb_cache);
3207 if (!sd_cdb_pool) {
3208 printk(KERN_ERR "sd: can't init extended cdb pool\n");
3209 goto err_out_cache;
3210 }
3211
3212 err = scsi_register_driver(&sd_template.gendrv);
3213 if (err)
3214 goto err_out_driver;
3215
3216 return 0;
3217
3218 err_out_driver:
3219 mempool_destroy(sd_cdb_pool);
3220
3221 err_out_cache:
3222 kmem_cache_destroy(sd_cdb_cache);
3223
3224 err_out_class:
3225 class_unregister(&sd_disk_class);
3226 err_out:
3227 for (i = 0; i < SD_MAJORS; i++)
3228 unregister_blkdev(sd_major(i), "sd");
3229 return err;
3230 }
3231
3232 /**
3233 * exit_sd - exit point for this driver (when it is a module).
3234 *
3235 * Note: this function unregisters this driver from the scsi mid-level.
3236 **/
3237 static void __exit exit_sd(void)
3238 {
3239 int i;
3240
3241 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
3242
3243 scsi_unregister_driver(&sd_template.gendrv);
3244 mempool_destroy(sd_cdb_pool);
3245 kmem_cache_destroy(sd_cdb_cache);
3246
3247 class_unregister(&sd_disk_class);
3248
3249 for (i = 0; i < SD_MAJORS; i++)
3250 unregister_blkdev(sd_major(i), "sd");
3251 }
3252
3253 module_init(init_sd);
3254 module_exit(exit_sd);
3255
3256 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
3257 struct scsi_sense_hdr *sshdr)
3258 {
3259 sd_printk(KERN_INFO, sdkp, " ");
3260 scsi_show_sense_hdr(sshdr);
3261 sd_printk(KERN_INFO, sdkp, " ");
3262 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
3263 }
3264
3265 static void sd_print_result(struct scsi_disk *sdkp, int result)
3266 {
3267 sd_printk(KERN_INFO, sdkp, " ");
3268 scsi_show_result(result);
3269 }
3270
kernel source for telekom puls (alcatel/mediatek)