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[SCSI] add residual argument to scsi_execute and scsi_execute_req
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1 /*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 * Modification history:
9 * - Drew Eckhardt <drew@colorado.edu> original
10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11 * outstanding request, and other enhancements.
12 * Support loadable low-level scsi drivers.
13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14 * eight major numbers.
15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17 * sd_init and cleanups.
18 * - Alex Davis <letmein@erols.com> Fix problem where partition info
19 * not being read in sd_open. Fix problem where removable media
20 * could be ejected after sd_open.
21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24 * Support 32k/1M disks.
25 *
26 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30 * - entering other commands: SCSI_LOG_HLQUEUE level 3
31 * Note: when the logging level is set by the user, it must be greater
32 * than the level indicated above to trigger output.
33 */
34
35 #include <linux/module.h>
36 #include <linux/fs.h>
37 #include <linux/kernel.h>
38 #include <linux/mm.h>
39 #include <linux/bio.h>
40 #include <linux/genhd.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <asm/uaccess.h>
52
53 #include <scsi/scsi.h>
54 #include <scsi/scsi_cmnd.h>
55 #include <scsi/scsi_dbg.h>
56 #include <scsi/scsi_device.h>
57 #include <scsi/scsi_driver.h>
58 #include <scsi/scsi_eh.h>
59 #include <scsi/scsi_host.h>
60 #include <scsi/scsi_ioctl.h>
61 #include <scsi/scsicam.h>
62
63 #include "sd.h"
64 #include "scsi_logging.h"
65
66 MODULE_AUTHOR("Eric Youngdale");
67 MODULE_DESCRIPTION("SCSI disk (sd) driver");
68 MODULE_LICENSE("GPL");
69
70 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
71 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
86 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
87 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
88 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
89
90 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
91 #define SD_MINORS 16
92 #else
93 #define SD_MINORS 0
94 #endif
95
96 static int sd_revalidate_disk(struct gendisk *);
97 static int sd_probe(struct device *);
98 static int sd_remove(struct device *);
99 static void sd_shutdown(struct device *);
100 static int sd_suspend(struct device *, pm_message_t state);
101 static int sd_resume(struct device *);
102 static void sd_rescan(struct device *);
103 static int sd_done(struct scsi_cmnd *);
104 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
105 static void scsi_disk_release(struct device *cdev);
106 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
107 static void sd_print_result(struct scsi_disk *, int);
108
109 static DEFINE_IDA(sd_index_ida);
110
111 /* This semaphore is used to mediate the 0->1 reference get in the
112 * face of object destruction (i.e. we can't allow a get on an
113 * object after last put) */
114 static DEFINE_MUTEX(sd_ref_mutex);
115
116 static const char *sd_cache_types[] = {
117 "write through", "none", "write back",
118 "write back, no read (daft)"
119 };
120
121 static ssize_t
122 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
123 const char *buf, size_t count)
124 {
125 int i, ct = -1, rcd, wce, sp;
126 struct scsi_disk *sdkp = to_scsi_disk(dev);
127 struct scsi_device *sdp = sdkp->device;
128 char buffer[64];
129 char *buffer_data;
130 struct scsi_mode_data data;
131 struct scsi_sense_hdr sshdr;
132 int len;
133
134 if (sdp->type != TYPE_DISK)
135 /* no cache control on RBC devices; theoretically they
136 * can do it, but there's probably so many exceptions
137 * it's not worth the risk */
138 return -EINVAL;
139
140 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
141 const int len = strlen(sd_cache_types[i]);
142 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
143 buf[len] == '\n') {
144 ct = i;
145 break;
146 }
147 }
148 if (ct < 0)
149 return -EINVAL;
150 rcd = ct & 0x01 ? 1 : 0;
151 wce = ct & 0x02 ? 1 : 0;
152 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
153 SD_MAX_RETRIES, &data, NULL))
154 return -EINVAL;
155 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
156 data.block_descriptor_length);
157 buffer_data = buffer + data.header_length +
158 data.block_descriptor_length;
159 buffer_data[2] &= ~0x05;
160 buffer_data[2] |= wce << 2 | rcd;
161 sp = buffer_data[0] & 0x80 ? 1 : 0;
162
163 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
164 SD_MAX_RETRIES, &data, &sshdr)) {
165 if (scsi_sense_valid(&sshdr))
166 sd_print_sense_hdr(sdkp, &sshdr);
167 return -EINVAL;
168 }
169 revalidate_disk(sdkp->disk);
170 return count;
171 }
172
173 static ssize_t
174 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
175 const char *buf, size_t count)
176 {
177 struct scsi_disk *sdkp = to_scsi_disk(dev);
178 struct scsi_device *sdp = sdkp->device;
179
180 if (!capable(CAP_SYS_ADMIN))
181 return -EACCES;
182
183 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
184
185 return count;
186 }
187
188 static ssize_t
189 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
190 const char *buf, size_t count)
191 {
192 struct scsi_disk *sdkp = to_scsi_disk(dev);
193 struct scsi_device *sdp = sdkp->device;
194
195 if (!capable(CAP_SYS_ADMIN))
196 return -EACCES;
197
198 if (sdp->type != TYPE_DISK)
199 return -EINVAL;
200
201 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
202
203 return count;
204 }
205
206 static ssize_t
207 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
208 char *buf)
209 {
210 struct scsi_disk *sdkp = to_scsi_disk(dev);
211 int ct = sdkp->RCD + 2*sdkp->WCE;
212
213 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
214 }
215
216 static ssize_t
217 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
218 {
219 struct scsi_disk *sdkp = to_scsi_disk(dev);
220
221 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
222 }
223
224 static ssize_t
225 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
226 char *buf)
227 {
228 struct scsi_disk *sdkp = to_scsi_disk(dev);
229 struct scsi_device *sdp = sdkp->device;
230
231 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
232 }
233
234 static ssize_t
235 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
236 char *buf)
237 {
238 struct scsi_disk *sdkp = to_scsi_disk(dev);
239
240 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
241 }
242
243 static ssize_t
244 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
245 char *buf)
246 {
247 struct scsi_disk *sdkp = to_scsi_disk(dev);
248
249 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
250 }
251
252 static ssize_t
253 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
254 char *buf)
255 {
256 struct scsi_disk *sdkp = to_scsi_disk(dev);
257
258 return snprintf(buf, 20, "%u\n", sdkp->ATO);
259 }
260
261 static struct device_attribute sd_disk_attrs[] = {
262 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
263 sd_store_cache_type),
264 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
265 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
266 sd_store_allow_restart),
267 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
268 sd_store_manage_start_stop),
269 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
270 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
271 __ATTR_NULL,
272 };
273
274 static struct class sd_disk_class = {
275 .name = "scsi_disk",
276 .owner = THIS_MODULE,
277 .dev_release = scsi_disk_release,
278 .dev_attrs = sd_disk_attrs,
279 };
280
281 static struct scsi_driver sd_template = {
282 .owner = THIS_MODULE,
283 .gendrv = {
284 .name = "sd",
285 .probe = sd_probe,
286 .remove = sd_remove,
287 .suspend = sd_suspend,
288 .resume = sd_resume,
289 .shutdown = sd_shutdown,
290 },
291 .rescan = sd_rescan,
292 .done = sd_done,
293 };
294
295 /*
296 * Device no to disk mapping:
297 *
298 * major disc2 disc p1
299 * |............|.............|....|....| <- dev_t
300 * 31 20 19 8 7 4 3 0
301 *
302 * Inside a major, we have 16k disks, however mapped non-
303 * contiguously. The first 16 disks are for major0, the next
304 * ones with major1, ... Disk 256 is for major0 again, disk 272
305 * for major1, ...
306 * As we stay compatible with our numbering scheme, we can reuse
307 * the well-know SCSI majors 8, 65--71, 136--143.
308 */
309 static int sd_major(int major_idx)
310 {
311 switch (major_idx) {
312 case 0:
313 return SCSI_DISK0_MAJOR;
314 case 1 ... 7:
315 return SCSI_DISK1_MAJOR + major_idx - 1;
316 case 8 ... 15:
317 return SCSI_DISK8_MAJOR + major_idx - 8;
318 default:
319 BUG();
320 return 0; /* shut up gcc */
321 }
322 }
323
324 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
325 {
326 struct scsi_disk *sdkp = NULL;
327
328 if (disk->private_data) {
329 sdkp = scsi_disk(disk);
330 if (scsi_device_get(sdkp->device) == 0)
331 get_device(&sdkp->dev);
332 else
333 sdkp = NULL;
334 }
335 return sdkp;
336 }
337
338 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
339 {
340 struct scsi_disk *sdkp;
341
342 mutex_lock(&sd_ref_mutex);
343 sdkp = __scsi_disk_get(disk);
344 mutex_unlock(&sd_ref_mutex);
345 return sdkp;
346 }
347
348 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
349 {
350 struct scsi_disk *sdkp;
351
352 mutex_lock(&sd_ref_mutex);
353 sdkp = dev_get_drvdata(dev);
354 if (sdkp)
355 sdkp = __scsi_disk_get(sdkp->disk);
356 mutex_unlock(&sd_ref_mutex);
357 return sdkp;
358 }
359
360 static void scsi_disk_put(struct scsi_disk *sdkp)
361 {
362 struct scsi_device *sdev = sdkp->device;
363
364 mutex_lock(&sd_ref_mutex);
365 put_device(&sdkp->dev);
366 scsi_device_put(sdev);
367 mutex_unlock(&sd_ref_mutex);
368 }
369
370 /**
371 * sd_init_command - build a scsi (read or write) command from
372 * information in the request structure.
373 * @SCpnt: pointer to mid-level's per scsi command structure that
374 * contains request and into which the scsi command is written
375 *
376 * Returns 1 if successful and 0 if error (or cannot be done now).
377 **/
378 static int sd_prep_fn(struct request_queue *q, struct request *rq)
379 {
380 struct scsi_cmnd *SCpnt;
381 struct scsi_device *sdp = q->queuedata;
382 struct gendisk *disk = rq->rq_disk;
383 struct scsi_disk *sdkp;
384 sector_t block = rq->sector;
385 sector_t threshold;
386 unsigned int this_count = rq->nr_sectors;
387 int ret, host_dif;
388
389 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
390 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
391 goto out;
392 } else if (rq->cmd_type != REQ_TYPE_FS) {
393 ret = BLKPREP_KILL;
394 goto out;
395 }
396 ret = scsi_setup_fs_cmnd(sdp, rq);
397 if (ret != BLKPREP_OK)
398 goto out;
399 SCpnt = rq->special;
400 sdkp = scsi_disk(disk);
401
402 /* from here on until we're complete, any goto out
403 * is used for a killable error condition */
404 ret = BLKPREP_KILL;
405
406 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
407 "sd_init_command: block=%llu, "
408 "count=%d\n",
409 (unsigned long long)block,
410 this_count));
411
412 if (!sdp || !scsi_device_online(sdp) ||
413 block + rq->nr_sectors > get_capacity(disk)) {
414 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
415 "Finishing %ld sectors\n",
416 rq->nr_sectors));
417 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
418 "Retry with 0x%p\n", SCpnt));
419 goto out;
420 }
421
422 if (sdp->changed) {
423 /*
424 * quietly refuse to do anything to a changed disc until
425 * the changed bit has been reset
426 */
427 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
428 goto out;
429 }
430
431 /*
432 * Some SD card readers can't handle multi-sector accesses which touch
433 * the last one or two hardware sectors. Split accesses as needed.
434 */
435 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
436 (sdp->sector_size / 512);
437
438 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
439 if (block < threshold) {
440 /* Access up to the threshold but not beyond */
441 this_count = threshold - block;
442 } else {
443 /* Access only a single hardware sector */
444 this_count = sdp->sector_size / 512;
445 }
446 }
447
448 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
449 (unsigned long long)block));
450
451 /*
452 * If we have a 1K hardware sectorsize, prevent access to single
453 * 512 byte sectors. In theory we could handle this - in fact
454 * the scsi cdrom driver must be able to handle this because
455 * we typically use 1K blocksizes, and cdroms typically have
456 * 2K hardware sectorsizes. Of course, things are simpler
457 * with the cdrom, since it is read-only. For performance
458 * reasons, the filesystems should be able to handle this
459 * and not force the scsi disk driver to use bounce buffers
460 * for this.
461 */
462 if (sdp->sector_size == 1024) {
463 if ((block & 1) || (rq->nr_sectors & 1)) {
464 scmd_printk(KERN_ERR, SCpnt,
465 "Bad block number requested\n");
466 goto out;
467 } else {
468 block = block >> 1;
469 this_count = this_count >> 1;
470 }
471 }
472 if (sdp->sector_size == 2048) {
473 if ((block & 3) || (rq->nr_sectors & 3)) {
474 scmd_printk(KERN_ERR, SCpnt,
475 "Bad block number requested\n");
476 goto out;
477 } else {
478 block = block >> 2;
479 this_count = this_count >> 2;
480 }
481 }
482 if (sdp->sector_size == 4096) {
483 if ((block & 7) || (rq->nr_sectors & 7)) {
484 scmd_printk(KERN_ERR, SCpnt,
485 "Bad block number requested\n");
486 goto out;
487 } else {
488 block = block >> 3;
489 this_count = this_count >> 3;
490 }
491 }
492 if (rq_data_dir(rq) == WRITE) {
493 if (!sdp->writeable) {
494 goto out;
495 }
496 SCpnt->cmnd[0] = WRITE_6;
497 SCpnt->sc_data_direction = DMA_TO_DEVICE;
498
499 if (blk_integrity_rq(rq) &&
500 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
501 goto out;
502
503 } else if (rq_data_dir(rq) == READ) {
504 SCpnt->cmnd[0] = READ_6;
505 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
506 } else {
507 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
508 goto out;
509 }
510
511 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
512 "%s %d/%ld 512 byte blocks.\n",
513 (rq_data_dir(rq) == WRITE) ?
514 "writing" : "reading", this_count,
515 rq->nr_sectors));
516
517 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
518 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
519 if (host_dif)
520 SCpnt->cmnd[1] = 1 << 5;
521 else
522 SCpnt->cmnd[1] = 0;
523
524 if (block > 0xffffffff) {
525 SCpnt->cmnd[0] += READ_16 - READ_6;
526 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
527 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
528 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
529 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
530 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
531 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
532 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
533 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
534 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
535 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
536 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
537 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
538 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
539 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
540 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
541 scsi_device_protection(SCpnt->device) ||
542 SCpnt->device->use_10_for_rw) {
543 if (this_count > 0xffff)
544 this_count = 0xffff;
545
546 SCpnt->cmnd[0] += READ_10 - READ_6;
547 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
548 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
549 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
550 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
551 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
552 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
553 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
554 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
555 } else {
556 if (unlikely(blk_fua_rq(rq))) {
557 /*
558 * This happens only if this drive failed
559 * 10byte rw command with ILLEGAL_REQUEST
560 * during operation and thus turned off
561 * use_10_for_rw.
562 */
563 scmd_printk(KERN_ERR, SCpnt,
564 "FUA write on READ/WRITE(6) drive\n");
565 goto out;
566 }
567
568 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
569 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
570 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
571 SCpnt->cmnd[4] = (unsigned char) this_count;
572 SCpnt->cmnd[5] = 0;
573 }
574 SCpnt->sdb.length = this_count * sdp->sector_size;
575
576 /* If DIF or DIX is enabled, tell HBA how to handle request */
577 if (host_dif || scsi_prot_sg_count(SCpnt))
578 sd_dif_op(SCpnt, host_dif, scsi_prot_sg_count(SCpnt),
579 sdkp->protection_type);
580
581 /*
582 * We shouldn't disconnect in the middle of a sector, so with a dumb
583 * host adapter, it's safe to assume that we can at least transfer
584 * this many bytes between each connect / disconnect.
585 */
586 SCpnt->transfersize = sdp->sector_size;
587 SCpnt->underflow = this_count << 9;
588 SCpnt->allowed = SD_MAX_RETRIES;
589
590 /*
591 * This indicates that the command is ready from our end to be
592 * queued.
593 */
594 ret = BLKPREP_OK;
595 out:
596 return scsi_prep_return(q, rq, ret);
597 }
598
599 /**
600 * sd_open - open a scsi disk device
601 * @inode: only i_rdev member may be used
602 * @filp: only f_mode and f_flags may be used
603 *
604 * Returns 0 if successful. Returns a negated errno value in case
605 * of error.
606 *
607 * Note: This can be called from a user context (e.g. fsck(1) )
608 * or from within the kernel (e.g. as a result of a mount(1) ).
609 * In the latter case @inode and @filp carry an abridged amount
610 * of information as noted above.
611 **/
612 static int sd_open(struct block_device *bdev, fmode_t mode)
613 {
614 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
615 struct scsi_device *sdev;
616 int retval;
617
618 if (!sdkp)
619 return -ENXIO;
620
621 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
622
623 sdev = sdkp->device;
624
625 /*
626 * If the device is in error recovery, wait until it is done.
627 * If the device is offline, then disallow any access to it.
628 */
629 retval = -ENXIO;
630 if (!scsi_block_when_processing_errors(sdev))
631 goto error_out;
632
633 if (sdev->removable || sdkp->write_prot)
634 check_disk_change(bdev);
635
636 /*
637 * If the drive is empty, just let the open fail.
638 */
639 retval = -ENOMEDIUM;
640 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
641 goto error_out;
642
643 /*
644 * If the device has the write protect tab set, have the open fail
645 * if the user expects to be able to write to the thing.
646 */
647 retval = -EROFS;
648 if (sdkp->write_prot && (mode & FMODE_WRITE))
649 goto error_out;
650
651 /*
652 * It is possible that the disk changing stuff resulted in
653 * the device being taken offline. If this is the case,
654 * report this to the user, and don't pretend that the
655 * open actually succeeded.
656 */
657 retval = -ENXIO;
658 if (!scsi_device_online(sdev))
659 goto error_out;
660
661 if (!sdkp->openers++ && sdev->removable) {
662 if (scsi_block_when_processing_errors(sdev))
663 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
664 }
665
666 return 0;
667
668 error_out:
669 scsi_disk_put(sdkp);
670 return retval;
671 }
672
673 /**
674 * sd_release - invoked when the (last) close(2) is called on this
675 * scsi disk.
676 * @inode: only i_rdev member may be used
677 * @filp: only f_mode and f_flags may be used
678 *
679 * Returns 0.
680 *
681 * Note: may block (uninterruptible) if error recovery is underway
682 * on this disk.
683 **/
684 static int sd_release(struct gendisk *disk, fmode_t mode)
685 {
686 struct scsi_disk *sdkp = scsi_disk(disk);
687 struct scsi_device *sdev = sdkp->device;
688
689 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
690
691 if (!--sdkp->openers && sdev->removable) {
692 if (scsi_block_when_processing_errors(sdev))
693 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
694 }
695
696 /*
697 * XXX and what if there are packets in flight and this close()
698 * XXX is followed by a "rmmod sd_mod"?
699 */
700 scsi_disk_put(sdkp);
701 return 0;
702 }
703
704 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
705 {
706 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
707 struct scsi_device *sdp = sdkp->device;
708 struct Scsi_Host *host = sdp->host;
709 int diskinfo[4];
710
711 /* default to most commonly used values */
712 diskinfo[0] = 0x40; /* 1 << 6 */
713 diskinfo[1] = 0x20; /* 1 << 5 */
714 diskinfo[2] = sdkp->capacity >> 11;
715
716 /* override with calculated, extended default, or driver values */
717 if (host->hostt->bios_param)
718 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
719 else
720 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
721
722 geo->heads = diskinfo[0];
723 geo->sectors = diskinfo[1];
724 geo->cylinders = diskinfo[2];
725 return 0;
726 }
727
728 /**
729 * sd_ioctl - process an ioctl
730 * @inode: only i_rdev/i_bdev members may be used
731 * @filp: only f_mode and f_flags may be used
732 * @cmd: ioctl command number
733 * @arg: this is third argument given to ioctl(2) system call.
734 * Often contains a pointer.
735 *
736 * Returns 0 if successful (some ioctls return postive numbers on
737 * success as well). Returns a negated errno value in case of error.
738 *
739 * Note: most ioctls are forward onto the block subsystem or further
740 * down in the scsi subsystem.
741 **/
742 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
743 unsigned int cmd, unsigned long arg)
744 {
745 struct gendisk *disk = bdev->bd_disk;
746 struct scsi_device *sdp = scsi_disk(disk)->device;
747 void __user *p = (void __user *)arg;
748 int error;
749
750 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
751 disk->disk_name, cmd));
752
753 /*
754 * If we are in the middle of error recovery, don't let anyone
755 * else try and use this device. Also, if error recovery fails, it
756 * may try and take the device offline, in which case all further
757 * access to the device is prohibited.
758 */
759 error = scsi_nonblockable_ioctl(sdp, cmd, p,
760 (mode & FMODE_NDELAY) != 0);
761 if (!scsi_block_when_processing_errors(sdp) || !error)
762 return error;
763
764 /*
765 * Send SCSI addressing ioctls directly to mid level, send other
766 * ioctls to block level and then onto mid level if they can't be
767 * resolved.
768 */
769 switch (cmd) {
770 case SCSI_IOCTL_GET_IDLUN:
771 case SCSI_IOCTL_GET_BUS_NUMBER:
772 return scsi_ioctl(sdp, cmd, p);
773 default:
774 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
775 if (error != -ENOTTY)
776 return error;
777 }
778 return scsi_ioctl(sdp, cmd, p);
779 }
780
781 static void set_media_not_present(struct scsi_disk *sdkp)
782 {
783 sdkp->media_present = 0;
784 sdkp->capacity = 0;
785 sdkp->device->changed = 1;
786 }
787
788 /**
789 * sd_media_changed - check if our medium changed
790 * @disk: kernel device descriptor
791 *
792 * Returns 0 if not applicable or no change; 1 if change
793 *
794 * Note: this function is invoked from the block subsystem.
795 **/
796 static int sd_media_changed(struct gendisk *disk)
797 {
798 struct scsi_disk *sdkp = scsi_disk(disk);
799 struct scsi_device *sdp = sdkp->device;
800 struct scsi_sense_hdr *sshdr = NULL;
801 int retval;
802
803 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
804
805 if (!sdp->removable)
806 return 0;
807
808 /*
809 * If the device is offline, don't send any commands - just pretend as
810 * if the command failed. If the device ever comes back online, we
811 * can deal with it then. It is only because of unrecoverable errors
812 * that we would ever take a device offline in the first place.
813 */
814 if (!scsi_device_online(sdp)) {
815 set_media_not_present(sdkp);
816 retval = 1;
817 goto out;
818 }
819
820 /*
821 * Using TEST_UNIT_READY enables differentiation between drive with
822 * no cartridge loaded - NOT READY, drive with changed cartridge -
823 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
824 *
825 * Drives that auto spin down. eg iomega jaz 1G, will be started
826 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
827 * sd_revalidate() is called.
828 */
829 retval = -ENODEV;
830
831 if (scsi_block_when_processing_errors(sdp)) {
832 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
833 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
834 sshdr);
835 }
836
837 /*
838 * Unable to test, unit probably not ready. This usually
839 * means there is no disc in the drive. Mark as changed,
840 * and we will figure it out later once the drive is
841 * available again.
842 */
843 if (retval || (scsi_sense_valid(sshdr) &&
844 /* 0x3a is medium not present */
845 sshdr->asc == 0x3a)) {
846 set_media_not_present(sdkp);
847 retval = 1;
848 goto out;
849 }
850
851 /*
852 * For removable scsi disk we have to recognise the presence
853 * of a disk in the drive. This is kept in the struct scsi_disk
854 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
855 */
856 sdkp->media_present = 1;
857
858 retval = sdp->changed;
859 sdp->changed = 0;
860 out:
861 if (retval != sdkp->previous_state)
862 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
863 sdkp->previous_state = retval;
864 kfree(sshdr);
865 return retval;
866 }
867
868 static int sd_sync_cache(struct scsi_disk *sdkp)
869 {
870 int retries, res;
871 struct scsi_device *sdp = sdkp->device;
872 struct scsi_sense_hdr sshdr;
873
874 if (!scsi_device_online(sdp))
875 return -ENODEV;
876
877
878 for (retries = 3; retries > 0; --retries) {
879 unsigned char cmd[10] = { 0 };
880
881 cmd[0] = SYNCHRONIZE_CACHE;
882 /*
883 * Leave the rest of the command zero to indicate
884 * flush everything.
885 */
886 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
887 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
888 if (res == 0)
889 break;
890 }
891
892 if (res) {
893 sd_print_result(sdkp, res);
894 if (driver_byte(res) & DRIVER_SENSE)
895 sd_print_sense_hdr(sdkp, &sshdr);
896 }
897
898 if (res)
899 return -EIO;
900 return 0;
901 }
902
903 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
904 {
905 rq->cmd_type = REQ_TYPE_BLOCK_PC;
906 rq->timeout = SD_TIMEOUT;
907 rq->cmd[0] = SYNCHRONIZE_CACHE;
908 rq->cmd_len = 10;
909 }
910
911 static void sd_rescan(struct device *dev)
912 {
913 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
914
915 if (sdkp) {
916 revalidate_disk(sdkp->disk);
917 scsi_disk_put(sdkp);
918 }
919 }
920
921
922 #ifdef CONFIG_COMPAT
923 /*
924 * This gets directly called from VFS. When the ioctl
925 * is not recognized we go back to the other translation paths.
926 */
927 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
928 unsigned int cmd, unsigned long arg)
929 {
930 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
931
932 /*
933 * If we are in the middle of error recovery, don't let anyone
934 * else try and use this device. Also, if error recovery fails, it
935 * may try and take the device offline, in which case all further
936 * access to the device is prohibited.
937 */
938 if (!scsi_block_when_processing_errors(sdev))
939 return -ENODEV;
940
941 if (sdev->host->hostt->compat_ioctl) {
942 int ret;
943
944 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
945
946 return ret;
947 }
948
949 /*
950 * Let the static ioctl translation table take care of it.
951 */
952 return -ENOIOCTLCMD;
953 }
954 #endif
955
956 static struct block_device_operations sd_fops = {
957 .owner = THIS_MODULE,
958 .open = sd_open,
959 .release = sd_release,
960 .locked_ioctl = sd_ioctl,
961 .getgeo = sd_getgeo,
962 #ifdef CONFIG_COMPAT
963 .compat_ioctl = sd_compat_ioctl,
964 #endif
965 .media_changed = sd_media_changed,
966 .revalidate_disk = sd_revalidate_disk,
967 };
968
969 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
970 {
971 u64 start_lba = scmd->request->sector;
972 u64 end_lba = scmd->request->sector + (scsi_bufflen(scmd) / 512);
973 u64 bad_lba;
974 int info_valid;
975
976 if (!blk_fs_request(scmd->request))
977 return 0;
978
979 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
980 SCSI_SENSE_BUFFERSIZE,
981 &bad_lba);
982 if (!info_valid)
983 return 0;
984
985 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
986 return 0;
987
988 if (scmd->device->sector_size < 512) {
989 /* only legitimate sector_size here is 256 */
990 start_lba <<= 1;
991 end_lba <<= 1;
992 } else {
993 /* be careful ... don't want any overflows */
994 u64 factor = scmd->device->sector_size / 512;
995 do_div(start_lba, factor);
996 do_div(end_lba, factor);
997 }
998
999 /* The bad lba was reported incorrectly, we have no idea where
1000 * the error is.
1001 */
1002 if (bad_lba < start_lba || bad_lba >= end_lba)
1003 return 0;
1004
1005 /* This computation should always be done in terms of
1006 * the resolution of the device's medium.
1007 */
1008 return (bad_lba - start_lba) * scmd->device->sector_size;
1009 }
1010
1011 /**
1012 * sd_done - bottom half handler: called when the lower level
1013 * driver has completed (successfully or otherwise) a scsi command.
1014 * @SCpnt: mid-level's per command structure.
1015 *
1016 * Note: potentially run from within an ISR. Must not block.
1017 **/
1018 static int sd_done(struct scsi_cmnd *SCpnt)
1019 {
1020 int result = SCpnt->result;
1021 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1022 struct scsi_sense_hdr sshdr;
1023 int sense_valid = 0;
1024 int sense_deferred = 0;
1025
1026 if (result) {
1027 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1028 if (sense_valid)
1029 sense_deferred = scsi_sense_is_deferred(&sshdr);
1030 }
1031 #ifdef CONFIG_SCSI_LOGGING
1032 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1033 if (sense_valid) {
1034 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1035 "sd_done: sb[respc,sk,asc,"
1036 "ascq]=%x,%x,%x,%x\n",
1037 sshdr.response_code,
1038 sshdr.sense_key, sshdr.asc,
1039 sshdr.ascq));
1040 }
1041 #endif
1042 if (driver_byte(result) != DRIVER_SENSE &&
1043 (!sense_valid || sense_deferred))
1044 goto out;
1045
1046 switch (sshdr.sense_key) {
1047 case HARDWARE_ERROR:
1048 case MEDIUM_ERROR:
1049 good_bytes = sd_completed_bytes(SCpnt);
1050 break;
1051 case RECOVERED_ERROR:
1052 /* Inform the user, but make sure that it's not treated
1053 * as a hard error.
1054 */
1055 scsi_print_sense("sd", SCpnt);
1056 SCpnt->result = 0;
1057 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1058 good_bytes = scsi_bufflen(SCpnt);
1059 break;
1060 case NO_SENSE:
1061 /* This indicates a false check condition, so ignore it. An
1062 * unknown amount of data was transferred so treat it as an
1063 * error.
1064 */
1065 scsi_print_sense("sd", SCpnt);
1066 SCpnt->result = 0;
1067 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1068 break;
1069 case ABORTED_COMMAND:
1070 if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */
1071 scsi_print_result(SCpnt);
1072 scsi_print_sense("sd", SCpnt);
1073 good_bytes = sd_completed_bytes(SCpnt);
1074 }
1075 break;
1076 case ILLEGAL_REQUEST:
1077 if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */
1078 scsi_print_result(SCpnt);
1079 scsi_print_sense("sd", SCpnt);
1080 good_bytes = sd_completed_bytes(SCpnt);
1081 }
1082 break;
1083 default:
1084 break;
1085 }
1086 out:
1087 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1088 sd_dif_complete(SCpnt, good_bytes);
1089
1090 return good_bytes;
1091 }
1092
1093 static int media_not_present(struct scsi_disk *sdkp,
1094 struct scsi_sense_hdr *sshdr)
1095 {
1096
1097 if (!scsi_sense_valid(sshdr))
1098 return 0;
1099 /* not invoked for commands that could return deferred errors */
1100 if (sshdr->sense_key != NOT_READY &&
1101 sshdr->sense_key != UNIT_ATTENTION)
1102 return 0;
1103 if (sshdr->asc != 0x3A) /* medium not present */
1104 return 0;
1105
1106 set_media_not_present(sdkp);
1107 return 1;
1108 }
1109
1110 /*
1111 * spinup disk - called only in sd_revalidate_disk()
1112 */
1113 static void
1114 sd_spinup_disk(struct scsi_disk *sdkp)
1115 {
1116 unsigned char cmd[10];
1117 unsigned long spintime_expire = 0;
1118 int retries, spintime;
1119 unsigned int the_result;
1120 struct scsi_sense_hdr sshdr;
1121 int sense_valid = 0;
1122
1123 spintime = 0;
1124
1125 /* Spin up drives, as required. Only do this at boot time */
1126 /* Spinup needs to be done for module loads too. */
1127 do {
1128 retries = 0;
1129
1130 do {
1131 cmd[0] = TEST_UNIT_READY;
1132 memset((void *) &cmd[1], 0, 9);
1133
1134 the_result = scsi_execute_req(sdkp->device, cmd,
1135 DMA_NONE, NULL, 0,
1136 &sshdr, SD_TIMEOUT,
1137 SD_MAX_RETRIES, NULL);
1138
1139 /*
1140 * If the drive has indicated to us that it
1141 * doesn't have any media in it, don't bother
1142 * with any more polling.
1143 */
1144 if (media_not_present(sdkp, &sshdr))
1145 return;
1146
1147 if (the_result)
1148 sense_valid = scsi_sense_valid(&sshdr);
1149 retries++;
1150 } while (retries < 3 &&
1151 (!scsi_status_is_good(the_result) ||
1152 ((driver_byte(the_result) & DRIVER_SENSE) &&
1153 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1154
1155 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1156 /* no sense, TUR either succeeded or failed
1157 * with a status error */
1158 if(!spintime && !scsi_status_is_good(the_result)) {
1159 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1160 sd_print_result(sdkp, the_result);
1161 }
1162 break;
1163 }
1164
1165 /*
1166 * The device does not want the automatic start to be issued.
1167 */
1168 if (sdkp->device->no_start_on_add) {
1169 break;
1170 }
1171
1172 /*
1173 * If manual intervention is required, or this is an
1174 * absent USB storage device, a spinup is meaningless.
1175 */
1176 if (sense_valid &&
1177 sshdr.sense_key == NOT_READY &&
1178 sshdr.asc == 4 && sshdr.ascq == 3) {
1179 break; /* manual intervention required */
1180
1181 /*
1182 * Issue command to spin up drive when not ready
1183 */
1184 } else if (sense_valid && sshdr.sense_key == NOT_READY) {
1185 if (!spintime) {
1186 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1187 cmd[0] = START_STOP;
1188 cmd[1] = 1; /* Return immediately */
1189 memset((void *) &cmd[2], 0, 8);
1190 cmd[4] = 1; /* Start spin cycle */
1191 if (sdkp->device->start_stop_pwr_cond)
1192 cmd[4] |= 1 << 4;
1193 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1194 NULL, 0, &sshdr,
1195 SD_TIMEOUT, SD_MAX_RETRIES,
1196 NULL);
1197 spintime_expire = jiffies + 100 * HZ;
1198 spintime = 1;
1199 }
1200 /* Wait 1 second for next try */
1201 msleep(1000);
1202 printk(".");
1203
1204 /*
1205 * Wait for USB flash devices with slow firmware.
1206 * Yes, this sense key/ASC combination shouldn't
1207 * occur here. It's characteristic of these devices.
1208 */
1209 } else if (sense_valid &&
1210 sshdr.sense_key == UNIT_ATTENTION &&
1211 sshdr.asc == 0x28) {
1212 if (!spintime) {
1213 spintime_expire = jiffies + 5 * HZ;
1214 spintime = 1;
1215 }
1216 /* Wait 1 second for next try */
1217 msleep(1000);
1218 } else {
1219 /* we don't understand the sense code, so it's
1220 * probably pointless to loop */
1221 if(!spintime) {
1222 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1223 sd_print_sense_hdr(sdkp, &sshdr);
1224 }
1225 break;
1226 }
1227
1228 } while (spintime && time_before_eq(jiffies, spintime_expire));
1229
1230 if (spintime) {
1231 if (scsi_status_is_good(the_result))
1232 printk("ready\n");
1233 else
1234 printk("not responding...\n");
1235 }
1236 }
1237
1238
1239 /*
1240 * Determine whether disk supports Data Integrity Field.
1241 */
1242 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1243 {
1244 struct scsi_device *sdp = sdkp->device;
1245 u8 type;
1246
1247 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1248 type = 0;
1249 else
1250 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1251
1252 sdkp->protection_type = type;
1253
1254 switch (type) {
1255 case SD_DIF_TYPE0_PROTECTION:
1256 case SD_DIF_TYPE1_PROTECTION:
1257 case SD_DIF_TYPE3_PROTECTION:
1258 break;
1259
1260 case SD_DIF_TYPE2_PROTECTION:
1261 sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \
1262 "protection which is currently unsupported. " \
1263 "Disabling disk!\n");
1264 goto disable;
1265
1266 default:
1267 sd_printk(KERN_ERR, sdkp, "formatted with unknown " \
1268 "protection type %d. Disabling disk!\n", type);
1269 goto disable;
1270 }
1271
1272 return;
1273
1274 disable:
1275 sdkp->capacity = 0;
1276 }
1277
1278 /*
1279 * read disk capacity
1280 */
1281 static void
1282 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1283 {
1284 unsigned char cmd[16];
1285 int the_result, retries;
1286 int sector_size = 0;
1287 /* Force READ CAPACITY(16) when PROTECT=1 */
1288 int longrc = scsi_device_protection(sdkp->device) ? 1 : 0;
1289 struct scsi_sense_hdr sshdr;
1290 int sense_valid = 0;
1291 struct scsi_device *sdp = sdkp->device;
1292
1293 repeat:
1294 retries = 3;
1295 do {
1296 if (longrc) {
1297 memset((void *) cmd, 0, 16);
1298 cmd[0] = SERVICE_ACTION_IN;
1299 cmd[1] = SAI_READ_CAPACITY_16;
1300 cmd[13] = 13;
1301 memset((void *) buffer, 0, 13);
1302 } else {
1303 cmd[0] = READ_CAPACITY;
1304 memset((void *) &cmd[1], 0, 9);
1305 memset((void *) buffer, 0, 8);
1306 }
1307
1308 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1309 buffer, longrc ? 13 : 8, &sshdr,
1310 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1311
1312 if (media_not_present(sdkp, &sshdr))
1313 return;
1314
1315 if (the_result)
1316 sense_valid = scsi_sense_valid(&sshdr);
1317 retries--;
1318
1319 } while (the_result && retries);
1320
1321 if (the_result && !longrc) {
1322 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1323 sd_print_result(sdkp, the_result);
1324 if (driver_byte(the_result) & DRIVER_SENSE)
1325 sd_print_sense_hdr(sdkp, &sshdr);
1326 else
1327 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1328
1329 /* Set dirty bit for removable devices if not ready -
1330 * sometimes drives will not report this properly. */
1331 if (sdp->removable &&
1332 sense_valid && sshdr.sense_key == NOT_READY)
1333 sdp->changed = 1;
1334
1335 /* Either no media are present but the drive didn't tell us,
1336 or they are present but the read capacity command fails */
1337 /* sdkp->media_present = 0; -- not always correct */
1338 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1339
1340 return;
1341 } else if (the_result && longrc) {
1342 /* READ CAPACITY(16) has been failed */
1343 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1344 sd_print_result(sdkp, the_result);
1345 sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n");
1346
1347 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1348 goto got_data;
1349 }
1350
1351 if (!longrc) {
1352 sector_size = (buffer[4] << 24) |
1353 (buffer[5] << 16) | (buffer[6] << 8) | buffer[7];
1354 if (buffer[0] == 0xff && buffer[1] == 0xff &&
1355 buffer[2] == 0xff && buffer[3] == 0xff) {
1356 if(sizeof(sdkp->capacity) > 4) {
1357 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1358 "Trying to use READ CAPACITY(16).\n");
1359 longrc = 1;
1360 goto repeat;
1361 }
1362 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use "
1363 "a kernel compiled with support for large "
1364 "block devices.\n");
1365 sdkp->capacity = 0;
1366 goto got_data;
1367 }
1368 sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) |
1369 (buffer[1] << 16) |
1370 (buffer[2] << 8) |
1371 buffer[3]);
1372 } else {
1373 sdkp->capacity = 1 + (((u64)buffer[0] << 56) |
1374 ((u64)buffer[1] << 48) |
1375 ((u64)buffer[2] << 40) |
1376 ((u64)buffer[3] << 32) |
1377 ((sector_t)buffer[4] << 24) |
1378 ((sector_t)buffer[5] << 16) |
1379 ((sector_t)buffer[6] << 8) |
1380 (sector_t)buffer[7]);
1381
1382 sector_size = (buffer[8] << 24) |
1383 (buffer[9] << 16) | (buffer[10] << 8) | buffer[11];
1384
1385 sd_read_protection_type(sdkp, buffer);
1386 }
1387
1388 /* Some devices return the total number of sectors, not the
1389 * highest sector number. Make the necessary adjustment. */
1390 if (sdp->fix_capacity) {
1391 --sdkp->capacity;
1392
1393 /* Some devices have version which report the correct sizes
1394 * and others which do not. We guess size according to a heuristic
1395 * and err on the side of lowering the capacity. */
1396 } else {
1397 if (sdp->guess_capacity)
1398 if (sdkp->capacity & 0x01) /* odd sizes are odd */
1399 --sdkp->capacity;
1400 }
1401
1402 got_data:
1403 if (sector_size == 0) {
1404 sector_size = 512;
1405 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1406 "assuming 512.\n");
1407 }
1408
1409 if (sector_size != 512 &&
1410 sector_size != 1024 &&
1411 sector_size != 2048 &&
1412 sector_size != 4096 &&
1413 sector_size != 256) {
1414 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1415 sector_size);
1416 /*
1417 * The user might want to re-format the drive with
1418 * a supported sectorsize. Once this happens, it
1419 * would be relatively trivial to set the thing up.
1420 * For this reason, we leave the thing in the table.
1421 */
1422 sdkp->capacity = 0;
1423 /*
1424 * set a bogus sector size so the normal read/write
1425 * logic in the block layer will eventually refuse any
1426 * request on this device without tripping over power
1427 * of two sector size assumptions
1428 */
1429 sector_size = 512;
1430 }
1431 blk_queue_hardsect_size(sdp->request_queue, sector_size);
1432
1433 {
1434 char cap_str_2[10], cap_str_10[10];
1435 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1436
1437 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1438 sizeof(cap_str_2));
1439 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1440 sizeof(cap_str_10));
1441
1442 sd_printk(KERN_NOTICE, sdkp,
1443 "%llu %d-byte hardware sectors: (%s/%s)\n",
1444 (unsigned long long)sdkp->capacity,
1445 sector_size, cap_str_10, cap_str_2);
1446 }
1447
1448 /* Rescale capacity to 512-byte units */
1449 if (sector_size == 4096)
1450 sdkp->capacity <<= 3;
1451 else if (sector_size == 2048)
1452 sdkp->capacity <<= 2;
1453 else if (sector_size == 1024)
1454 sdkp->capacity <<= 1;
1455 else if (sector_size == 256)
1456 sdkp->capacity >>= 1;
1457
1458 sdkp->device->sector_size = sector_size;
1459 }
1460
1461 /* called with buffer of length 512 */
1462 static inline int
1463 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1464 unsigned char *buffer, int len, struct scsi_mode_data *data,
1465 struct scsi_sense_hdr *sshdr)
1466 {
1467 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1468 SD_TIMEOUT, SD_MAX_RETRIES, data,
1469 sshdr);
1470 }
1471
1472 /*
1473 * read write protect setting, if possible - called only in sd_revalidate_disk()
1474 * called with buffer of length SD_BUF_SIZE
1475 */
1476 static void
1477 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1478 {
1479 int res;
1480 struct scsi_device *sdp = sdkp->device;
1481 struct scsi_mode_data data;
1482
1483 set_disk_ro(sdkp->disk, 0);
1484 if (sdp->skip_ms_page_3f) {
1485 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1486 return;
1487 }
1488
1489 if (sdp->use_192_bytes_for_3f) {
1490 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1491 } else {
1492 /*
1493 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1494 * We have to start carefully: some devices hang if we ask
1495 * for more than is available.
1496 */
1497 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1498
1499 /*
1500 * Second attempt: ask for page 0 When only page 0 is
1501 * implemented, a request for page 3F may return Sense Key
1502 * 5: Illegal Request, Sense Code 24: Invalid field in
1503 * CDB.
1504 */
1505 if (!scsi_status_is_good(res))
1506 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1507
1508 /*
1509 * Third attempt: ask 255 bytes, as we did earlier.
1510 */
1511 if (!scsi_status_is_good(res))
1512 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1513 &data, NULL);
1514 }
1515
1516 if (!scsi_status_is_good(res)) {
1517 sd_printk(KERN_WARNING, sdkp,
1518 "Test WP failed, assume Write Enabled\n");
1519 } else {
1520 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1521 set_disk_ro(sdkp->disk, sdkp->write_prot);
1522 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1523 sdkp->write_prot ? "on" : "off");
1524 sd_printk(KERN_DEBUG, sdkp,
1525 "Mode Sense: %02x %02x %02x %02x\n",
1526 buffer[0], buffer[1], buffer[2], buffer[3]);
1527 }
1528 }
1529
1530 /*
1531 * sd_read_cache_type - called only from sd_revalidate_disk()
1532 * called with buffer of length SD_BUF_SIZE
1533 */
1534 static void
1535 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1536 {
1537 int len = 0, res;
1538 struct scsi_device *sdp = sdkp->device;
1539
1540 int dbd;
1541 int modepage;
1542 struct scsi_mode_data data;
1543 struct scsi_sense_hdr sshdr;
1544
1545 if (sdp->skip_ms_page_8)
1546 goto defaults;
1547
1548 if (sdp->type == TYPE_RBC) {
1549 modepage = 6;
1550 dbd = 8;
1551 } else {
1552 modepage = 8;
1553 dbd = 0;
1554 }
1555
1556 /* cautiously ask */
1557 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1558
1559 if (!scsi_status_is_good(res))
1560 goto bad_sense;
1561
1562 if (!data.header_length) {
1563 modepage = 6;
1564 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1565 }
1566
1567 /* that went OK, now ask for the proper length */
1568 len = data.length;
1569
1570 /*
1571 * We're only interested in the first three bytes, actually.
1572 * But the data cache page is defined for the first 20.
1573 */
1574 if (len < 3)
1575 goto bad_sense;
1576 if (len > 20)
1577 len = 20;
1578
1579 /* Take headers and block descriptors into account */
1580 len += data.header_length + data.block_descriptor_length;
1581 if (len > SD_BUF_SIZE)
1582 goto bad_sense;
1583
1584 /* Get the data */
1585 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1586
1587 if (scsi_status_is_good(res)) {
1588 int offset = data.header_length + data.block_descriptor_length;
1589
1590 if (offset >= SD_BUF_SIZE - 2) {
1591 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1592 goto defaults;
1593 }
1594
1595 if ((buffer[offset] & 0x3f) != modepage) {
1596 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1597 goto defaults;
1598 }
1599
1600 if (modepage == 8) {
1601 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1602 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1603 } else {
1604 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1605 sdkp->RCD = 0;
1606 }
1607
1608 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1609 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1610 sd_printk(KERN_NOTICE, sdkp,
1611 "Uses READ/WRITE(6), disabling FUA\n");
1612 sdkp->DPOFUA = 0;
1613 }
1614
1615 sd_printk(KERN_NOTICE, sdkp,
1616 "Write cache: %s, read cache: %s, %s\n",
1617 sdkp->WCE ? "enabled" : "disabled",
1618 sdkp->RCD ? "disabled" : "enabled",
1619 sdkp->DPOFUA ? "supports DPO and FUA"
1620 : "doesn't support DPO or FUA");
1621
1622 return;
1623 }
1624
1625 bad_sense:
1626 if (scsi_sense_valid(&sshdr) &&
1627 sshdr.sense_key == ILLEGAL_REQUEST &&
1628 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1629 /* Invalid field in CDB */
1630 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1631 else
1632 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1633
1634 defaults:
1635 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1636 sdkp->WCE = 0;
1637 sdkp->RCD = 0;
1638 sdkp->DPOFUA = 0;
1639 }
1640
1641 /*
1642 * The ATO bit indicates whether the DIF application tag is available
1643 * for use by the operating system.
1644 */
1645 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1646 {
1647 int res, offset;
1648 struct scsi_device *sdp = sdkp->device;
1649 struct scsi_mode_data data;
1650 struct scsi_sense_hdr sshdr;
1651
1652 if (sdp->type != TYPE_DISK)
1653 return;
1654
1655 if (sdkp->protection_type == 0)
1656 return;
1657
1658 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1659 SD_MAX_RETRIES, &data, &sshdr);
1660
1661 if (!scsi_status_is_good(res) || !data.header_length ||
1662 data.length < 6) {
1663 sd_printk(KERN_WARNING, sdkp,
1664 "getting Control mode page failed, assume no ATO\n");
1665
1666 if (scsi_sense_valid(&sshdr))
1667 sd_print_sense_hdr(sdkp, &sshdr);
1668
1669 return;
1670 }
1671
1672 offset = data.header_length + data.block_descriptor_length;
1673
1674 if ((buffer[offset] & 0x3f) != 0x0a) {
1675 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1676 return;
1677 }
1678
1679 if ((buffer[offset + 5] & 0x80) == 0)
1680 return;
1681
1682 sdkp->ATO = 1;
1683
1684 return;
1685 }
1686
1687 /**
1688 * sd_revalidate_disk - called the first time a new disk is seen,
1689 * performs disk spin up, read_capacity, etc.
1690 * @disk: struct gendisk we care about
1691 **/
1692 static int sd_revalidate_disk(struct gendisk *disk)
1693 {
1694 struct scsi_disk *sdkp = scsi_disk(disk);
1695 struct scsi_device *sdp = sdkp->device;
1696 unsigned char *buffer;
1697 unsigned ordered;
1698
1699 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
1700 "sd_revalidate_disk\n"));
1701
1702 /*
1703 * If the device is offline, don't try and read capacity or any
1704 * of the other niceties.
1705 */
1706 if (!scsi_device_online(sdp))
1707 goto out;
1708
1709 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1710 if (!buffer) {
1711 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
1712 "allocation failure.\n");
1713 goto out;
1714 }
1715
1716 /* defaults, until the device tells us otherwise */
1717 sdp->sector_size = 512;
1718 sdkp->capacity = 0;
1719 sdkp->media_present = 1;
1720 sdkp->write_prot = 0;
1721 sdkp->WCE = 0;
1722 sdkp->RCD = 0;
1723 sdkp->ATO = 0;
1724
1725 sd_spinup_disk(sdkp);
1726
1727 /*
1728 * Without media there is no reason to ask; moreover, some devices
1729 * react badly if we do.
1730 */
1731 if (sdkp->media_present) {
1732 sd_read_capacity(sdkp, buffer);
1733 sd_read_write_protect_flag(sdkp, buffer);
1734 sd_read_cache_type(sdkp, buffer);
1735 sd_read_app_tag_own(sdkp, buffer);
1736 }
1737
1738 /*
1739 * We now have all cache related info, determine how we deal
1740 * with ordered requests. Note that as the current SCSI
1741 * dispatch function can alter request order, we cannot use
1742 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1743 */
1744 if (sdkp->WCE)
1745 ordered = sdkp->DPOFUA
1746 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
1747 else
1748 ordered = QUEUE_ORDERED_DRAIN;
1749
1750 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1751
1752 set_capacity(disk, sdkp->capacity);
1753 kfree(buffer);
1754
1755 out:
1756 return 0;
1757 }
1758
1759 /**
1760 * sd_format_disk_name - format disk name
1761 * @prefix: name prefix - ie. "sd" for SCSI disks
1762 * @index: index of the disk to format name for
1763 * @buf: output buffer
1764 * @buflen: length of the output buffer
1765 *
1766 * SCSI disk names starts at sda. The 26th device is sdz and the
1767 * 27th is sdaa. The last one for two lettered suffix is sdzz
1768 * which is followed by sdaaa.
1769 *
1770 * This is basically 26 base counting with one extra 'nil' entry
1771 * at the beggining from the second digit on and can be
1772 * determined using similar method as 26 base conversion with the
1773 * index shifted -1 after each digit is computed.
1774 *
1775 * CONTEXT:
1776 * Don't care.
1777 *
1778 * RETURNS:
1779 * 0 on success, -errno on failure.
1780 */
1781 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
1782 {
1783 const int base = 'z' - 'a' + 1;
1784 char *begin = buf + strlen(prefix);
1785 char *end = buf + buflen;
1786 char *p;
1787 int unit;
1788
1789 p = end - 1;
1790 *p = '\0';
1791 unit = base;
1792 do {
1793 if (p == begin)
1794 return -EINVAL;
1795 *--p = 'a' + (index % unit);
1796 index = (index / unit) - 1;
1797 } while (index >= 0);
1798
1799 memmove(begin, p, end - p);
1800 memcpy(buf, prefix, strlen(prefix));
1801
1802 return 0;
1803 }
1804
1805 /**
1806 * sd_probe - called during driver initialization and whenever a
1807 * new scsi device is attached to the system. It is called once
1808 * for each scsi device (not just disks) present.
1809 * @dev: pointer to device object
1810 *
1811 * Returns 0 if successful (or not interested in this scsi device
1812 * (e.g. scanner)); 1 when there is an error.
1813 *
1814 * Note: this function is invoked from the scsi mid-level.
1815 * This function sets up the mapping between a given
1816 * <host,channel,id,lun> (found in sdp) and new device name
1817 * (e.g. /dev/sda). More precisely it is the block device major
1818 * and minor number that is chosen here.
1819 *
1820 * Assume sd_attach is not re-entrant (for time being)
1821 * Also think about sd_attach() and sd_remove() running coincidentally.
1822 **/
1823 static int sd_probe(struct device *dev)
1824 {
1825 struct scsi_device *sdp = to_scsi_device(dev);
1826 struct scsi_disk *sdkp;
1827 struct gendisk *gd;
1828 u32 index;
1829 int error;
1830
1831 error = -ENODEV;
1832 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
1833 goto out;
1834
1835 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
1836 "sd_attach\n"));
1837
1838 error = -ENOMEM;
1839 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
1840 if (!sdkp)
1841 goto out;
1842
1843 gd = alloc_disk(SD_MINORS);
1844 if (!gd)
1845 goto out_free;
1846
1847 do {
1848 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
1849 goto out_put;
1850
1851 error = ida_get_new(&sd_index_ida, &index);
1852 } while (error == -EAGAIN);
1853
1854 if (error)
1855 goto out_put;
1856
1857 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
1858 if (error)
1859 goto out_free_index;
1860
1861 sdkp->device = sdp;
1862 sdkp->driver = &sd_template;
1863 sdkp->disk = gd;
1864 sdkp->index = index;
1865 sdkp->openers = 0;
1866 sdkp->previous_state = 1;
1867
1868 if (!sdp->request_queue->rq_timeout) {
1869 if (sdp->type != TYPE_MOD)
1870 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
1871 else
1872 blk_queue_rq_timeout(sdp->request_queue,
1873 SD_MOD_TIMEOUT);
1874 }
1875
1876 device_initialize(&sdkp->dev);
1877 sdkp->dev.parent = &sdp->sdev_gendev;
1878 sdkp->dev.class = &sd_disk_class;
1879 strncpy(sdkp->dev.bus_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);
1880
1881 if (device_add(&sdkp->dev))
1882 goto out_free_index;
1883
1884 get_device(&sdp->sdev_gendev);
1885
1886 if (index < SD_MAX_DISKS) {
1887 gd->major = sd_major((index & 0xf0) >> 4);
1888 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
1889 gd->minors = SD_MINORS;
1890 }
1891 gd->fops = &sd_fops;
1892 gd->private_data = &sdkp->driver;
1893 gd->queue = sdkp->device->request_queue;
1894
1895 sd_revalidate_disk(gd);
1896
1897 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
1898
1899 gd->driverfs_dev = &sdp->sdev_gendev;
1900 gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;
1901 if (sdp->removable)
1902 gd->flags |= GENHD_FL_REMOVABLE;
1903
1904 dev_set_drvdata(dev, sdkp);
1905 add_disk(gd);
1906 sd_dif_config_host(sdkp);
1907
1908 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
1909 sdp->removable ? "removable " : "");
1910
1911 return 0;
1912
1913 out_free_index:
1914 ida_remove(&sd_index_ida, index);
1915 out_put:
1916 put_disk(gd);
1917 out_free:
1918 kfree(sdkp);
1919 out:
1920 return error;
1921 }
1922
1923 /**
1924 * sd_remove - called whenever a scsi disk (previously recognized by
1925 * sd_probe) is detached from the system. It is called (potentially
1926 * multiple times) during sd module unload.
1927 * @sdp: pointer to mid level scsi device object
1928 *
1929 * Note: this function is invoked from the scsi mid-level.
1930 * This function potentially frees up a device name (e.g. /dev/sdc)
1931 * that could be re-used by a subsequent sd_probe().
1932 * This function is not called when the built-in sd driver is "exit-ed".
1933 **/
1934 static int sd_remove(struct device *dev)
1935 {
1936 struct scsi_disk *sdkp = dev_get_drvdata(dev);
1937
1938 device_del(&sdkp->dev);
1939 del_gendisk(sdkp->disk);
1940 sd_shutdown(dev);
1941
1942 mutex_lock(&sd_ref_mutex);
1943 dev_set_drvdata(dev, NULL);
1944 put_device(&sdkp->dev);
1945 mutex_unlock(&sd_ref_mutex);
1946
1947 return 0;
1948 }
1949
1950 /**
1951 * scsi_disk_release - Called to free the scsi_disk structure
1952 * @dev: pointer to embedded class device
1953 *
1954 * sd_ref_mutex must be held entering this routine. Because it is
1955 * called on last put, you should always use the scsi_disk_get()
1956 * scsi_disk_put() helpers which manipulate the semaphore directly
1957 * and never do a direct put_device.
1958 **/
1959 static void scsi_disk_release(struct device *dev)
1960 {
1961 struct scsi_disk *sdkp = to_scsi_disk(dev);
1962 struct gendisk *disk = sdkp->disk;
1963
1964 ida_remove(&sd_index_ida, sdkp->index);
1965
1966 disk->private_data = NULL;
1967 put_disk(disk);
1968 put_device(&sdkp->device->sdev_gendev);
1969
1970 kfree(sdkp);
1971 }
1972
1973 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
1974 {
1975 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
1976 struct scsi_sense_hdr sshdr;
1977 struct scsi_device *sdp = sdkp->device;
1978 int res;
1979
1980 if (start)
1981 cmd[4] |= 1; /* START */
1982
1983 if (sdp->start_stop_pwr_cond)
1984 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
1985
1986 if (!scsi_device_online(sdp))
1987 return -ENODEV;
1988
1989 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
1990 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1991 if (res) {
1992 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
1993 sd_print_result(sdkp, res);
1994 if (driver_byte(res) & DRIVER_SENSE)
1995 sd_print_sense_hdr(sdkp, &sshdr);
1996 }
1997
1998 return res;
1999 }
2000
2001 /*
2002 * Send a SYNCHRONIZE CACHE instruction down to the device through
2003 * the normal SCSI command structure. Wait for the command to
2004 * complete.
2005 */
2006 static void sd_shutdown(struct device *dev)
2007 {
2008 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2009
2010 if (!sdkp)
2011 return; /* this can happen */
2012
2013 if (sdkp->WCE) {
2014 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2015 sd_sync_cache(sdkp);
2016 }
2017
2018 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2019 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2020 sd_start_stop_device(sdkp, 0);
2021 }
2022
2023 scsi_disk_put(sdkp);
2024 }
2025
2026 static int sd_suspend(struct device *dev, pm_message_t mesg)
2027 {
2028 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2029 int ret = 0;
2030
2031 if (!sdkp)
2032 return 0; /* this can happen */
2033
2034 if (sdkp->WCE) {
2035 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2036 ret = sd_sync_cache(sdkp);
2037 if (ret)
2038 goto done;
2039 }
2040
2041 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2042 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2043 ret = sd_start_stop_device(sdkp, 0);
2044 }
2045
2046 done:
2047 scsi_disk_put(sdkp);
2048 return ret;
2049 }
2050
2051 static int sd_resume(struct device *dev)
2052 {
2053 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2054 int ret = 0;
2055
2056 if (!sdkp->device->manage_start_stop)
2057 goto done;
2058
2059 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2060 ret = sd_start_stop_device(sdkp, 1);
2061
2062 done:
2063 scsi_disk_put(sdkp);
2064 return ret;
2065 }
2066
2067 /**
2068 * init_sd - entry point for this driver (both when built in or when
2069 * a module).
2070 *
2071 * Note: this function registers this driver with the scsi mid-level.
2072 **/
2073 static int __init init_sd(void)
2074 {
2075 int majors = 0, i, err;
2076
2077 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2078
2079 for (i = 0; i < SD_MAJORS; i++)
2080 if (register_blkdev(sd_major(i), "sd") == 0)
2081 majors++;
2082
2083 if (!majors)
2084 return -ENODEV;
2085
2086 err = class_register(&sd_disk_class);
2087 if (err)
2088 goto err_out;
2089
2090 err = scsi_register_driver(&sd_template.gendrv);
2091 if (err)
2092 goto err_out_class;
2093
2094 return 0;
2095
2096 err_out_class:
2097 class_unregister(&sd_disk_class);
2098 err_out:
2099 for (i = 0; i < SD_MAJORS; i++)
2100 unregister_blkdev(sd_major(i), "sd");
2101 return err;
2102 }
2103
2104 /**
2105 * exit_sd - exit point for this driver (when it is a module).
2106 *
2107 * Note: this function unregisters this driver from the scsi mid-level.
2108 **/
2109 static void __exit exit_sd(void)
2110 {
2111 int i;
2112
2113 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2114
2115 scsi_unregister_driver(&sd_template.gendrv);
2116 class_unregister(&sd_disk_class);
2117
2118 for (i = 0; i < SD_MAJORS; i++)
2119 unregister_blkdev(sd_major(i), "sd");
2120 }
2121
2122 module_init(init_sd);
2123 module_exit(exit_sd);
2124
2125 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2126 struct scsi_sense_hdr *sshdr)
2127 {
2128 sd_printk(KERN_INFO, sdkp, "");
2129 scsi_show_sense_hdr(sshdr);
2130 sd_printk(KERN_INFO, sdkp, "");
2131 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2132 }
2133
2134 static void sd_print_result(struct scsi_disk *sdkp, int result)
2135 {
2136 sd_printk(KERN_INFO, sdkp, "");
2137 scsi_show_result(result);
2138 }
2139