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drm: Add the debug info in generic drm mode by using DRM_DEBUG_KMS
[linux/fpc-iii.git] / drivers / scsi / sd.c
blob5616cd780ff3504420363d0c42b24af0274218c6
1 /*
2 * sd.c Copyright (C) 1992 Drew Eckhardt
3 * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale
4 *
5 * Linux scsi disk driver
6 * Initial versions: Drew Eckhardt
7 * Subsequent revisions: Eric Youngdale
8 * Modification history:
9 * - Drew Eckhardt <drew@colorado.edu> original
10 * - Eric Youngdale <eric@andante.org> add scatter-gather, multiple
11 * outstanding request, and other enhancements.
12 * Support loadable low-level scsi drivers.
13 * - Jirka Hanika <geo@ff.cuni.cz> support more scsi disks using
14 * eight major numbers.
15 * - Richard Gooch <rgooch@atnf.csiro.au> support devfs.
16 * - Torben Mathiasen <tmm@image.dk> Resource allocation fixes in
17 * sd_init and cleanups.
18 * - Alex Davis <letmein@erols.com> Fix problem where partition info
19 * not being read in sd_open. Fix problem where removable media
20 * could be ejected after sd_open.
21 * - Douglas Gilbert <dgilbert@interlog.com> cleanup for lk 2.5.x
22 * - Badari Pulavarty <pbadari@us.ibm.com>, Matthew Wilcox
23 * <willy@debian.org>, Kurt Garloff <garloff@suse.de>:
24 * Support 32k/1M disks.
25 *
26 * Logging policy (needs CONFIG_SCSI_LOGGING defined):
27 * - setting up transfer: SCSI_LOG_HLQUEUE levels 1 and 2
28 * - end of transfer (bh + scsi_lib): SCSI_LOG_HLCOMPLETE level 1
29 * - entering sd_ioctl: SCSI_LOG_IOCTL level 1
30 * - entering other commands: SCSI_LOG_HLQUEUE level 3
31 * Note: when the logging level is set by the user, it must be greater
32 * than the level indicated above to trigger output.
33 */
34
35 #include <linux/module.h>
36 #include <linux/fs.h>
37 #include <linux/kernel.h>
38 #include <linux/mm.h>
39 #include <linux/bio.h>
40 #include <linux/genhd.h>
41 #include <linux/hdreg.h>
42 #include <linux/errno.h>
43 #include <linux/idr.h>
44 #include <linux/interrupt.h>
45 #include <linux/init.h>
46 #include <linux/blkdev.h>
47 #include <linux/blkpg.h>
48 #include <linux/delay.h>
49 #include <linux/mutex.h>
50 #include <linux/string_helpers.h>
51 #include <linux/async.h>
52 #include <asm/uaccess.h>
53 #include <asm/unaligned.h>
54
55 #include <scsi/scsi.h>
56 #include <scsi/scsi_cmnd.h>
57 #include <scsi/scsi_dbg.h>
58 #include <scsi/scsi_device.h>
59 #include <scsi/scsi_driver.h>
60 #include <scsi/scsi_eh.h>
61 #include <scsi/scsi_host.h>
62 #include <scsi/scsi_ioctl.h>
63 #include <scsi/scsicam.h>
64
65 #include "sd.h"
66 #include "scsi_logging.h"
67
68 MODULE_AUTHOR("Eric Youngdale");
69 MODULE_DESCRIPTION("SCSI disk (sd) driver");
70 MODULE_LICENSE("GPL");
71
72 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR);
73 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR);
74 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR);
75 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR);
76 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR);
77 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR);
78 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR);
79 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR);
80 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR);
81 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR);
82 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR);
83 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR);
84 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR);
85 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR);
86 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR);
87 MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR);
88 MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
89 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
90 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
91
92 #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
93 #define SD_MINORS 16
94 #else
95 #define SD_MINORS 0
96 #endif
97
98 static int sd_revalidate_disk(struct gendisk *);
99 static int sd_probe(struct device *);
100 static int sd_remove(struct device *);
101 static void sd_shutdown(struct device *);
102 static int sd_suspend(struct device *, pm_message_t state);
103 static int sd_resume(struct device *);
104 static void sd_rescan(struct device *);
105 static int sd_done(struct scsi_cmnd *);
106 static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
107 static void scsi_disk_release(struct device *cdev);
108 static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
109 static void sd_print_result(struct scsi_disk *, int);
110
111 static DEFINE_SPINLOCK(sd_index_lock);
112 static DEFINE_IDA(sd_index_ida);
113
114 /* This semaphore is used to mediate the 0->1 reference get in the
115 * face of object destruction (i.e. we can't allow a get on an
116 * object after last put) */
117 static DEFINE_MUTEX(sd_ref_mutex);
118
119 static const char *sd_cache_types[] = {
120 "write through", "none", "write back",
121 "write back, no read (daft)"
122 };
123
124 static ssize_t
125 sd_store_cache_type(struct device *dev, struct device_attribute *attr,
126 const char *buf, size_t count)
127 {
128 int i, ct = -1, rcd, wce, sp;
129 struct scsi_disk *sdkp = to_scsi_disk(dev);
130 struct scsi_device *sdp = sdkp->device;
131 char buffer[64];
132 char *buffer_data;
133 struct scsi_mode_data data;
134 struct scsi_sense_hdr sshdr;
135 int len;
136
137 if (sdp->type != TYPE_DISK)
138 /* no cache control on RBC devices; theoretically they
139 * can do it, but there's probably so many exceptions
140 * it's not worth the risk */
141 return -EINVAL;
142
143 for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) {
144 const int len = strlen(sd_cache_types[i]);
145 if (strncmp(sd_cache_types[i], buf, len) == 0 &&
146 buf[len] == '\n') {
147 ct = i;
148 break;
149 }
150 }
151 if (ct < 0)
152 return -EINVAL;
153 rcd = ct & 0x01 ? 1 : 0;
154 wce = ct & 0x02 ? 1 : 0;
155 if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT,
156 SD_MAX_RETRIES, &data, NULL))
157 return -EINVAL;
158 len = min_t(size_t, sizeof(buffer), data.length - data.header_length -
159 data.block_descriptor_length);
160 buffer_data = buffer + data.header_length +
161 data.block_descriptor_length;
162 buffer_data[2] &= ~0x05;
163 buffer_data[2] |= wce << 2 | rcd;
164 sp = buffer_data[0] & 0x80 ? 1 : 0;
165
166 if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT,
167 SD_MAX_RETRIES, &data, &sshdr)) {
168 if (scsi_sense_valid(&sshdr))
169 sd_print_sense_hdr(sdkp, &sshdr);
170 return -EINVAL;
171 }
172 revalidate_disk(sdkp->disk);
173 return count;
174 }
175
176 static ssize_t
177 sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr,
178 const char *buf, size_t count)
179 {
180 struct scsi_disk *sdkp = to_scsi_disk(dev);
181 struct scsi_device *sdp = sdkp->device;
182
183 if (!capable(CAP_SYS_ADMIN))
184 return -EACCES;
185
186 sdp->manage_start_stop = simple_strtoul(buf, NULL, 10);
187
188 return count;
189 }
190
191 static ssize_t
192 sd_store_allow_restart(struct device *dev, struct device_attribute *attr,
193 const char *buf, size_t count)
194 {
195 struct scsi_disk *sdkp = to_scsi_disk(dev);
196 struct scsi_device *sdp = sdkp->device;
197
198 if (!capable(CAP_SYS_ADMIN))
199 return -EACCES;
200
201 if (sdp->type != TYPE_DISK)
202 return -EINVAL;
203
204 sdp->allow_restart = simple_strtoul(buf, NULL, 10);
205
206 return count;
207 }
208
209 static ssize_t
210 sd_show_cache_type(struct device *dev, struct device_attribute *attr,
211 char *buf)
212 {
213 struct scsi_disk *sdkp = to_scsi_disk(dev);
214 int ct = sdkp->RCD + 2*sdkp->WCE;
215
216 return snprintf(buf, 40, "%s\n", sd_cache_types[ct]);
217 }
218
219 static ssize_t
220 sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf)
221 {
222 struct scsi_disk *sdkp = to_scsi_disk(dev);
223
224 return snprintf(buf, 20, "%u\n", sdkp->DPOFUA);
225 }
226
227 static ssize_t
228 sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr,
229 char *buf)
230 {
231 struct scsi_disk *sdkp = to_scsi_disk(dev);
232 struct scsi_device *sdp = sdkp->device;
233
234 return snprintf(buf, 20, "%u\n", sdp->manage_start_stop);
235 }
236
237 static ssize_t
238 sd_show_allow_restart(struct device *dev, struct device_attribute *attr,
239 char *buf)
240 {
241 struct scsi_disk *sdkp = to_scsi_disk(dev);
242
243 return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart);
244 }
245
246 static ssize_t
247 sd_show_protection_type(struct device *dev, struct device_attribute *attr,
248 char *buf)
249 {
250 struct scsi_disk *sdkp = to_scsi_disk(dev);
251
252 return snprintf(buf, 20, "%u\n", sdkp->protection_type);
253 }
254
255 static ssize_t
256 sd_show_app_tag_own(struct device *dev, struct device_attribute *attr,
257 char *buf)
258 {
259 struct scsi_disk *sdkp = to_scsi_disk(dev);
260
261 return snprintf(buf, 20, "%u\n", sdkp->ATO);
262 }
263
264 static struct device_attribute sd_disk_attrs[] = {
265 __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type,
266 sd_store_cache_type),
267 __ATTR(FUA, S_IRUGO, sd_show_fua, NULL),
268 __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart,
269 sd_store_allow_restart),
270 __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop,
271 sd_store_manage_start_stop),
272 __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL),
273 __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL),
274 __ATTR_NULL,
275 };
276
277 static struct class sd_disk_class = {
278 .name = "scsi_disk",
279 .owner = THIS_MODULE,
280 .dev_release = scsi_disk_release,
281 .dev_attrs = sd_disk_attrs,
282 };
283
284 static struct scsi_driver sd_template = {
285 .owner = THIS_MODULE,
286 .gendrv = {
287 .name = "sd",
288 .probe = sd_probe,
289 .remove = sd_remove,
290 .suspend = sd_suspend,
291 .resume = sd_resume,
292 .shutdown = sd_shutdown,
293 },
294 .rescan = sd_rescan,
295 .done = sd_done,
296 };
297
298 /*
299 * Device no to disk mapping:
300 *
301 * major disc2 disc p1
302 * |............|.............|....|....| <- dev_t
303 * 31 20 19 8 7 4 3 0
304 *
305 * Inside a major, we have 16k disks, however mapped non-
306 * contiguously. The first 16 disks are for major0, the next
307 * ones with major1, ... Disk 256 is for major0 again, disk 272
308 * for major1, ...
309 * As we stay compatible with our numbering scheme, we can reuse
310 * the well-know SCSI majors 8, 65--71, 136--143.
311 */
312 static int sd_major(int major_idx)
313 {
314 switch (major_idx) {
315 case 0:
316 return SCSI_DISK0_MAJOR;
317 case 1 ... 7:
318 return SCSI_DISK1_MAJOR + major_idx - 1;
319 case 8 ... 15:
320 return SCSI_DISK8_MAJOR + major_idx - 8;
321 default:
322 BUG();
323 return 0; /* shut up gcc */
324 }
325 }
326
327 static struct scsi_disk *__scsi_disk_get(struct gendisk *disk)
328 {
329 struct scsi_disk *sdkp = NULL;
330
331 if (disk->private_data) {
332 sdkp = scsi_disk(disk);
333 if (scsi_device_get(sdkp->device) == 0)
334 get_device(&sdkp->dev);
335 else
336 sdkp = NULL;
337 }
338 return sdkp;
339 }
340
341 static struct scsi_disk *scsi_disk_get(struct gendisk *disk)
342 {
343 struct scsi_disk *sdkp;
344
345 mutex_lock(&sd_ref_mutex);
346 sdkp = __scsi_disk_get(disk);
347 mutex_unlock(&sd_ref_mutex);
348 return sdkp;
349 }
350
351 static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev)
352 {
353 struct scsi_disk *sdkp;
354
355 mutex_lock(&sd_ref_mutex);
356 sdkp = dev_get_drvdata(dev);
357 if (sdkp)
358 sdkp = __scsi_disk_get(sdkp->disk);
359 mutex_unlock(&sd_ref_mutex);
360 return sdkp;
361 }
362
363 static void scsi_disk_put(struct scsi_disk *sdkp)
364 {
365 struct scsi_device *sdev = sdkp->device;
366
367 mutex_lock(&sd_ref_mutex);
368 put_device(&sdkp->dev);
369 scsi_device_put(sdev);
370 mutex_unlock(&sd_ref_mutex);
371 }
372
373 /**
374 * sd_init_command - build a scsi (read or write) command from
375 * information in the request structure.
376 * @SCpnt: pointer to mid-level's per scsi command structure that
377 * contains request and into which the scsi command is written
378 *
379 * Returns 1 if successful and 0 if error (or cannot be done now).
380 **/
381 static int sd_prep_fn(struct request_queue *q, struct request *rq)
382 {
383 struct scsi_cmnd *SCpnt;
384 struct scsi_device *sdp = q->queuedata;
385 struct gendisk *disk = rq->rq_disk;
386 struct scsi_disk *sdkp;
387 sector_t block = blk_rq_pos(rq);
388 sector_t threshold;
389 unsigned int this_count = blk_rq_sectors(rq);
390 int ret, host_dif;
391
392 if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
393 ret = scsi_setup_blk_pc_cmnd(sdp, rq);
394 goto out;
395 } else if (rq->cmd_type != REQ_TYPE_FS) {
396 ret = BLKPREP_KILL;
397 goto out;
398 }
399 ret = scsi_setup_fs_cmnd(sdp, rq);
400 if (ret != BLKPREP_OK)
401 goto out;
402 SCpnt = rq->special;
403 sdkp = scsi_disk(disk);
404
405 /* from here on until we're complete, any goto out
406 * is used for a killable error condition */
407 ret = BLKPREP_KILL;
408
409 SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
410 "sd_init_command: block=%llu, "
411 "count=%d\n",
412 (unsigned long long)block,
413 this_count));
414
415 if (!sdp || !scsi_device_online(sdp) ||
416 block + blk_rq_sectors(rq) > get_capacity(disk)) {
417 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
418 "Finishing %u sectors\n",
419 blk_rq_sectors(rq)));
420 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
421 "Retry with 0x%p\n", SCpnt));
422 goto out;
423 }
424
425 if (sdp->changed) {
426 /*
427 * quietly refuse to do anything to a changed disc until
428 * the changed bit has been reset
429 */
430 /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */
431 goto out;
432 }
433
434 /*
435 * Some SD card readers can't handle multi-sector accesses which touch
436 * the last one or two hardware sectors. Split accesses as needed.
437 */
438 threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS *
439 (sdp->sector_size / 512);
440
441 if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) {
442 if (block < threshold) {
443 /* Access up to the threshold but not beyond */
444 this_count = threshold - block;
445 } else {
446 /* Access only a single hardware sector */
447 this_count = sdp->sector_size / 512;
448 }
449 }
450
451 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n",
452 (unsigned long long)block));
453
454 /*
455 * If we have a 1K hardware sectorsize, prevent access to single
456 * 512 byte sectors. In theory we could handle this - in fact
457 * the scsi cdrom driver must be able to handle this because
458 * we typically use 1K blocksizes, and cdroms typically have
459 * 2K hardware sectorsizes. Of course, things are simpler
460 * with the cdrom, since it is read-only. For performance
461 * reasons, the filesystems should be able to handle this
462 * and not force the scsi disk driver to use bounce buffers
463 * for this.
464 */
465 if (sdp->sector_size == 1024) {
466 if ((block & 1) || (blk_rq_sectors(rq) & 1)) {
467 scmd_printk(KERN_ERR, SCpnt,
468 "Bad block number requested\n");
469 goto out;
470 } else {
471 block = block >> 1;
472 this_count = this_count >> 1;
473 }
474 }
475 if (sdp->sector_size == 2048) {
476 if ((block & 3) || (blk_rq_sectors(rq) & 3)) {
477 scmd_printk(KERN_ERR, SCpnt,
478 "Bad block number requested\n");
479 goto out;
480 } else {
481 block = block >> 2;
482 this_count = this_count >> 2;
483 }
484 }
485 if (sdp->sector_size == 4096) {
486 if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
487 scmd_printk(KERN_ERR, SCpnt,
488 "Bad block number requested\n");
489 goto out;
490 } else {
491 block = block >> 3;
492 this_count = this_count >> 3;
493 }
494 }
495 if (rq_data_dir(rq) == WRITE) {
496 if (!sdp->writeable) {
497 goto out;
498 }
499 SCpnt->cmnd[0] = WRITE_6;
500 SCpnt->sc_data_direction = DMA_TO_DEVICE;
501
502 if (blk_integrity_rq(rq) &&
503 sd_dif_prepare(rq, block, sdp->sector_size) == -EIO)
504 goto out;
505
506 } else if (rq_data_dir(rq) == READ) {
507 SCpnt->cmnd[0] = READ_6;
508 SCpnt->sc_data_direction = DMA_FROM_DEVICE;
509 } else {
510 scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags);
511 goto out;
512 }
513
514 SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt,
515 "%s %d/%u 512 byte blocks.\n",
516 (rq_data_dir(rq) == WRITE) ?
517 "writing" : "reading", this_count,
518 blk_rq_sectors(rq)));
519
520 /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */
521 host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type);
522 if (host_dif)
523 SCpnt->cmnd[1] = 1 << 5;
524 else
525 SCpnt->cmnd[1] = 0;
526
527 if (block > 0xffffffff) {
528 SCpnt->cmnd[0] += READ_16 - READ_6;
529 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
530 SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0;
531 SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0;
532 SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0;
533 SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0;
534 SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff;
535 SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff;
536 SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff;
537 SCpnt->cmnd[9] = (unsigned char) block & 0xff;
538 SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff;
539 SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff;
540 SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff;
541 SCpnt->cmnd[13] = (unsigned char) this_count & 0xff;
542 SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0;
543 } else if ((this_count > 0xff) || (block > 0x1fffff) ||
544 scsi_device_protection(SCpnt->device) ||
545 SCpnt->device->use_10_for_rw) {
546 if (this_count > 0xffff)
547 this_count = 0xffff;
548
549 SCpnt->cmnd[0] += READ_10 - READ_6;
550 SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0;
551 SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff;
552 SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff;
553 SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff;
554 SCpnt->cmnd[5] = (unsigned char) block & 0xff;
555 SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0;
556 SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff;
557 SCpnt->cmnd[8] = (unsigned char) this_count & 0xff;
558 } else {
559 if (unlikely(blk_fua_rq(rq))) {
560 /*
561 * This happens only if this drive failed
562 * 10byte rw command with ILLEGAL_REQUEST
563 * during operation and thus turned off
564 * use_10_for_rw.
565 */
566 scmd_printk(KERN_ERR, SCpnt,
567 "FUA write on READ/WRITE(6) drive\n");
568 goto out;
569 }
570
571 SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f);
572 SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff);
573 SCpnt->cmnd[3] = (unsigned char) block & 0xff;
574 SCpnt->cmnd[4] = (unsigned char) this_count;
575 SCpnt->cmnd[5] = 0;
576 }
577 SCpnt->sdb.length = this_count * sdp->sector_size;
578
579 /* If DIF or DIX is enabled, tell HBA how to handle request */
580 if (host_dif || scsi_prot_sg_count(SCpnt))
581 sd_dif_op(SCpnt, host_dif, scsi_prot_sg_count(SCpnt),
582 sdkp->protection_type);
583
584 /*
585 * We shouldn't disconnect in the middle of a sector, so with a dumb
586 * host adapter, it's safe to assume that we can at least transfer
587 * this many bytes between each connect / disconnect.
588 */
589 SCpnt->transfersize = sdp->sector_size;
590 SCpnt->underflow = this_count << 9;
591 SCpnt->allowed = SD_MAX_RETRIES;
592
593 /*
594 * This indicates that the command is ready from our end to be
595 * queued.
596 */
597 ret = BLKPREP_OK;
598 out:
599 return scsi_prep_return(q, rq, ret);
600 }
601
602 /**
603 * sd_open - open a scsi disk device
604 * @inode: only i_rdev member may be used
605 * @filp: only f_mode and f_flags may be used
606 *
607 * Returns 0 if successful. Returns a negated errno value in case
608 * of error.
609 *
610 * Note: This can be called from a user context (e.g. fsck(1) )
611 * or from within the kernel (e.g. as a result of a mount(1) ).
612 * In the latter case @inode and @filp carry an abridged amount
613 * of information as noted above.
614 **/
615 static int sd_open(struct block_device *bdev, fmode_t mode)
616 {
617 struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk);
618 struct scsi_device *sdev;
619 int retval;
620
621 if (!sdkp)
622 return -ENXIO;
623
624 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n"));
625
626 sdev = sdkp->device;
627
628 /*
629 * If the device is in error recovery, wait until it is done.
630 * If the device is offline, then disallow any access to it.
631 */
632 retval = -ENXIO;
633 if (!scsi_block_when_processing_errors(sdev))
634 goto error_out;
635
636 if (sdev->removable || sdkp->write_prot)
637 check_disk_change(bdev);
638
639 /*
640 * If the drive is empty, just let the open fail.
641 */
642 retval = -ENOMEDIUM;
643 if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY))
644 goto error_out;
645
646 /*
647 * If the device has the write protect tab set, have the open fail
648 * if the user expects to be able to write to the thing.
649 */
650 retval = -EROFS;
651 if (sdkp->write_prot && (mode & FMODE_WRITE))
652 goto error_out;
653
654 /*
655 * It is possible that the disk changing stuff resulted in
656 * the device being taken offline. If this is the case,
657 * report this to the user, and don't pretend that the
658 * open actually succeeded.
659 */
660 retval = -ENXIO;
661 if (!scsi_device_online(sdev))
662 goto error_out;
663
664 if (!sdkp->openers++ && sdev->removable) {
665 if (scsi_block_when_processing_errors(sdev))
666 scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT);
667 }
668
669 return 0;
670
671 error_out:
672 scsi_disk_put(sdkp);
673 return retval;
674 }
675
676 /**
677 * sd_release - invoked when the (last) close(2) is called on this
678 * scsi disk.
679 * @inode: only i_rdev member may be used
680 * @filp: only f_mode and f_flags may be used
681 *
682 * Returns 0.
683 *
684 * Note: may block (uninterruptible) if error recovery is underway
685 * on this disk.
686 **/
687 static int sd_release(struct gendisk *disk, fmode_t mode)
688 {
689 struct scsi_disk *sdkp = scsi_disk(disk);
690 struct scsi_device *sdev = sdkp->device;
691
692 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n"));
693
694 if (!--sdkp->openers && sdev->removable) {
695 if (scsi_block_when_processing_errors(sdev))
696 scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW);
697 }
698
699 /*
700 * XXX and what if there are packets in flight and this close()
701 * XXX is followed by a "rmmod sd_mod"?
702 */
703 scsi_disk_put(sdkp);
704 return 0;
705 }
706
707 static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo)
708 {
709 struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk);
710 struct scsi_device *sdp = sdkp->device;
711 struct Scsi_Host *host = sdp->host;
712 int diskinfo[4];
713
714 /* default to most commonly used values */
715 diskinfo[0] = 0x40; /* 1 << 6 */
716 diskinfo[1] = 0x20; /* 1 << 5 */
717 diskinfo[2] = sdkp->capacity >> 11;
718
719 /* override with calculated, extended default, or driver values */
720 if (host->hostt->bios_param)
721 host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo);
722 else
723 scsicam_bios_param(bdev, sdkp->capacity, diskinfo);
724
725 geo->heads = diskinfo[0];
726 geo->sectors = diskinfo[1];
727 geo->cylinders = diskinfo[2];
728 return 0;
729 }
730
731 /**
732 * sd_ioctl - process an ioctl
733 * @inode: only i_rdev/i_bdev members may be used
734 * @filp: only f_mode and f_flags may be used
735 * @cmd: ioctl command number
736 * @arg: this is third argument given to ioctl(2) system call.
737 * Often contains a pointer.
738 *
739 * Returns 0 if successful (some ioctls return postive numbers on
740 * success as well). Returns a negated errno value in case of error.
741 *
742 * Note: most ioctls are forward onto the block subsystem or further
743 * down in the scsi subsystem.
744 **/
745 static int sd_ioctl(struct block_device *bdev, fmode_t mode,
746 unsigned int cmd, unsigned long arg)
747 {
748 struct gendisk *disk = bdev->bd_disk;
749 struct scsi_device *sdp = scsi_disk(disk)->device;
750 void __user *p = (void __user *)arg;
751 int error;
752
753 SCSI_LOG_IOCTL(1, printk("sd_ioctl: disk=%s, cmd=0x%x\n",
754 disk->disk_name, cmd));
755
756 /*
757 * If we are in the middle of error recovery, don't let anyone
758 * else try and use this device. Also, if error recovery fails, it
759 * may try and take the device offline, in which case all further
760 * access to the device is prohibited.
761 */
762 error = scsi_nonblockable_ioctl(sdp, cmd, p,
763 (mode & FMODE_NDELAY) != 0);
764 if (!scsi_block_when_processing_errors(sdp) || !error)
765 return error;
766
767 /*
768 * Send SCSI addressing ioctls directly to mid level, send other
769 * ioctls to block level and then onto mid level if they can't be
770 * resolved.
771 */
772 switch (cmd) {
773 case SCSI_IOCTL_GET_IDLUN:
774 case SCSI_IOCTL_GET_BUS_NUMBER:
775 return scsi_ioctl(sdp, cmd, p);
776 default:
777 error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p);
778 if (error != -ENOTTY)
779 return error;
780 }
781 return scsi_ioctl(sdp, cmd, p);
782 }
783
784 static void set_media_not_present(struct scsi_disk *sdkp)
785 {
786 sdkp->media_present = 0;
787 sdkp->capacity = 0;
788 sdkp->device->changed = 1;
789 }
790
791 /**
792 * sd_media_changed - check if our medium changed
793 * @disk: kernel device descriptor
794 *
795 * Returns 0 if not applicable or no change; 1 if change
796 *
797 * Note: this function is invoked from the block subsystem.
798 **/
799 static int sd_media_changed(struct gendisk *disk)
800 {
801 struct scsi_disk *sdkp = scsi_disk(disk);
802 struct scsi_device *sdp = sdkp->device;
803 struct scsi_sense_hdr *sshdr = NULL;
804 int retval;
805
806 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n"));
807
808 if (!sdp->removable)
809 return 0;
810
811 /*
812 * If the device is offline, don't send any commands - just pretend as
813 * if the command failed. If the device ever comes back online, we
814 * can deal with it then. It is only because of unrecoverable errors
815 * that we would ever take a device offline in the first place.
816 */
817 if (!scsi_device_online(sdp)) {
818 set_media_not_present(sdkp);
819 retval = 1;
820 goto out;
821 }
822
823 /*
824 * Using TEST_UNIT_READY enables differentiation between drive with
825 * no cartridge loaded - NOT READY, drive with changed cartridge -
826 * UNIT ATTENTION, or with same cartridge - GOOD STATUS.
827 *
828 * Drives that auto spin down. eg iomega jaz 1G, will be started
829 * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever
830 * sd_revalidate() is called.
831 */
832 retval = -ENODEV;
833
834 if (scsi_block_when_processing_errors(sdp)) {
835 sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL);
836 retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES,
837 sshdr);
838 }
839
840 /*
841 * Unable to test, unit probably not ready. This usually
842 * means there is no disc in the drive. Mark as changed,
843 * and we will figure it out later once the drive is
844 * available again.
845 */
846 if (retval || (scsi_sense_valid(sshdr) &&
847 /* 0x3a is medium not present */
848 sshdr->asc == 0x3a)) {
849 set_media_not_present(sdkp);
850 retval = 1;
851 goto out;
852 }
853
854 /*
855 * For removable scsi disk we have to recognise the presence
856 * of a disk in the drive. This is kept in the struct scsi_disk
857 * struct and tested at open ! Daniel Roche (dan@lectra.fr)
858 */
859 sdkp->media_present = 1;
860
861 retval = sdp->changed;
862 sdp->changed = 0;
863 out:
864 if (retval != sdkp->previous_state)
865 sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL);
866 sdkp->previous_state = retval;
867 kfree(sshdr);
868 return retval;
869 }
870
871 static int sd_sync_cache(struct scsi_disk *sdkp)
872 {
873 int retries, res;
874 struct scsi_device *sdp = sdkp->device;
875 struct scsi_sense_hdr sshdr;
876
877 if (!scsi_device_online(sdp))
878 return -ENODEV;
879
880
881 for (retries = 3; retries > 0; --retries) {
882 unsigned char cmd[10] = { 0 };
883
884 cmd[0] = SYNCHRONIZE_CACHE;
885 /*
886 * Leave the rest of the command zero to indicate
887 * flush everything.
888 */
889 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
890 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
891 if (res == 0)
892 break;
893 }
894
895 if (res) {
896 sd_print_result(sdkp, res);
897 if (driver_byte(res) & DRIVER_SENSE)
898 sd_print_sense_hdr(sdkp, &sshdr);
899 }
900
901 if (res)
902 return -EIO;
903 return 0;
904 }
905
906 static void sd_prepare_flush(struct request_queue *q, struct request *rq)
907 {
908 rq->cmd_type = REQ_TYPE_BLOCK_PC;
909 rq->timeout = SD_TIMEOUT;
910 rq->cmd[0] = SYNCHRONIZE_CACHE;
911 rq->cmd_len = 10;
912 }
913
914 static void sd_rescan(struct device *dev)
915 {
916 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
917
918 if (sdkp) {
919 revalidate_disk(sdkp->disk);
920 scsi_disk_put(sdkp);
921 }
922 }
923
924
925 #ifdef CONFIG_COMPAT
926 /*
927 * This gets directly called from VFS. When the ioctl
928 * is not recognized we go back to the other translation paths.
929 */
930 static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode,
931 unsigned int cmd, unsigned long arg)
932 {
933 struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device;
934
935 /*
936 * If we are in the middle of error recovery, don't let anyone
937 * else try and use this device. Also, if error recovery fails, it
938 * may try and take the device offline, in which case all further
939 * access to the device is prohibited.
940 */
941 if (!scsi_block_when_processing_errors(sdev))
942 return -ENODEV;
943
944 if (sdev->host->hostt->compat_ioctl) {
945 int ret;
946
947 ret = sdev->host->hostt->compat_ioctl(sdev, cmd, (void __user *)arg);
948
949 return ret;
950 }
951
952 /*
953 * Let the static ioctl translation table take care of it.
954 */
955 return -ENOIOCTLCMD;
956 }
957 #endif
958
959 static struct block_device_operations sd_fops = {
960 .owner = THIS_MODULE,
961 .open = sd_open,
962 .release = sd_release,
963 .locked_ioctl = sd_ioctl,
964 .getgeo = sd_getgeo,
965 #ifdef CONFIG_COMPAT
966 .compat_ioctl = sd_compat_ioctl,
967 #endif
968 .media_changed = sd_media_changed,
969 .revalidate_disk = sd_revalidate_disk,
970 };
971
972 static unsigned int sd_completed_bytes(struct scsi_cmnd *scmd)
973 {
974 u64 start_lba = blk_rq_pos(scmd->request);
975 u64 end_lba = blk_rq_pos(scmd->request) + (scsi_bufflen(scmd) / 512);
976 u64 bad_lba;
977 int info_valid;
978
979 if (!blk_fs_request(scmd->request))
980 return 0;
981
982 info_valid = scsi_get_sense_info_fld(scmd->sense_buffer,
983 SCSI_SENSE_BUFFERSIZE,
984 &bad_lba);
985 if (!info_valid)
986 return 0;
987
988 if (scsi_bufflen(scmd) <= scmd->device->sector_size)
989 return 0;
990
991 if (scmd->device->sector_size < 512) {
992 /* only legitimate sector_size here is 256 */
993 start_lba <<= 1;
994 end_lba <<= 1;
995 } else {
996 /* be careful ... don't want any overflows */
997 u64 factor = scmd->device->sector_size / 512;
998 do_div(start_lba, factor);
999 do_div(end_lba, factor);
1000 }
1001
1002 /* The bad lba was reported incorrectly, we have no idea where
1003 * the error is.
1004 */
1005 if (bad_lba < start_lba || bad_lba >= end_lba)
1006 return 0;
1007
1008 /* This computation should always be done in terms of
1009 * the resolution of the device's medium.
1010 */
1011 return (bad_lba - start_lba) * scmd->device->sector_size;
1012 }
1013
1014 /**
1015 * sd_done - bottom half handler: called when the lower level
1016 * driver has completed (successfully or otherwise) a scsi command.
1017 * @SCpnt: mid-level's per command structure.
1018 *
1019 * Note: potentially run from within an ISR. Must not block.
1020 **/
1021 static int sd_done(struct scsi_cmnd *SCpnt)
1022 {
1023 int result = SCpnt->result;
1024 unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt);
1025 struct scsi_sense_hdr sshdr;
1026 int sense_valid = 0;
1027 int sense_deferred = 0;
1028
1029 if (result) {
1030 sense_valid = scsi_command_normalize_sense(SCpnt, &sshdr);
1031 if (sense_valid)
1032 sense_deferred = scsi_sense_is_deferred(&sshdr);
1033 }
1034 #ifdef CONFIG_SCSI_LOGGING
1035 SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
1036 if (sense_valid) {
1037 SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
1038 "sd_done: sb[respc,sk,asc,"
1039 "ascq]=%x,%x,%x,%x\n",
1040 sshdr.response_code,
1041 sshdr.sense_key, sshdr.asc,
1042 sshdr.ascq));
1043 }
1044 #endif
1045 if (driver_byte(result) != DRIVER_SENSE &&
1046 (!sense_valid || sense_deferred))
1047 goto out;
1048
1049 switch (sshdr.sense_key) {
1050 case HARDWARE_ERROR:
1051 case MEDIUM_ERROR:
1052 good_bytes = sd_completed_bytes(SCpnt);
1053 break;
1054 case RECOVERED_ERROR:
1055 good_bytes = scsi_bufflen(SCpnt);
1056 break;
1057 case NO_SENSE:
1058 /* This indicates a false check condition, so ignore it. An
1059 * unknown amount of data was transferred so treat it as an
1060 * error.
1061 */
1062 scsi_print_sense("sd", SCpnt);
1063 SCpnt->result = 0;
1064 memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE);
1065 break;
1066 case ABORTED_COMMAND:
1067 if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */
1068 scsi_print_result(SCpnt);
1069 scsi_print_sense("sd", SCpnt);
1070 good_bytes = sd_completed_bytes(SCpnt);
1071 }
1072 break;
1073 case ILLEGAL_REQUEST:
1074 if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */
1075 scsi_print_result(SCpnt);
1076 scsi_print_sense("sd", SCpnt);
1077 good_bytes = sd_completed_bytes(SCpnt);
1078 }
1079 break;
1080 default:
1081 break;
1082 }
1083 out:
1084 if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt))
1085 sd_dif_complete(SCpnt, good_bytes);
1086
1087 return good_bytes;
1088 }
1089
1090 static int media_not_present(struct scsi_disk *sdkp,
1091 struct scsi_sense_hdr *sshdr)
1092 {
1093
1094 if (!scsi_sense_valid(sshdr))
1095 return 0;
1096 /* not invoked for commands that could return deferred errors */
1097 if (sshdr->sense_key != NOT_READY &&
1098 sshdr->sense_key != UNIT_ATTENTION)
1099 return 0;
1100 if (sshdr->asc != 0x3A) /* medium not present */
1101 return 0;
1102
1103 set_media_not_present(sdkp);
1104 return 1;
1105 }
1106
1107 /*
1108 * spinup disk - called only in sd_revalidate_disk()
1109 */
1110 static void
1111 sd_spinup_disk(struct scsi_disk *sdkp)
1112 {
1113 unsigned char cmd[10];
1114 unsigned long spintime_expire = 0;
1115 int retries, spintime;
1116 unsigned int the_result;
1117 struct scsi_sense_hdr sshdr;
1118 int sense_valid = 0;
1119
1120 spintime = 0;
1121
1122 /* Spin up drives, as required. Only do this at boot time */
1123 /* Spinup needs to be done for module loads too. */
1124 do {
1125 retries = 0;
1126
1127 do {
1128 cmd[0] = TEST_UNIT_READY;
1129 memset((void *) &cmd[1], 0, 9);
1130
1131 the_result = scsi_execute_req(sdkp->device, cmd,
1132 DMA_NONE, NULL, 0,
1133 &sshdr, SD_TIMEOUT,
1134 SD_MAX_RETRIES, NULL);
1135
1136 /*
1137 * If the drive has indicated to us that it
1138 * doesn't have any media in it, don't bother
1139 * with any more polling.
1140 */
1141 if (media_not_present(sdkp, &sshdr))
1142 return;
1143
1144 if (the_result)
1145 sense_valid = scsi_sense_valid(&sshdr);
1146 retries++;
1147 } while (retries < 3 &&
1148 (!scsi_status_is_good(the_result) ||
1149 ((driver_byte(the_result) & DRIVER_SENSE) &&
1150 sense_valid && sshdr.sense_key == UNIT_ATTENTION)));
1151
1152 if ((driver_byte(the_result) & DRIVER_SENSE) == 0) {
1153 /* no sense, TUR either succeeded or failed
1154 * with a status error */
1155 if(!spintime && !scsi_status_is_good(the_result)) {
1156 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1157 sd_print_result(sdkp, the_result);
1158 }
1159 break;
1160 }
1161
1162 /*
1163 * The device does not want the automatic start to be issued.
1164 */
1165 if (sdkp->device->no_start_on_add)
1166 break;
1167
1168 if (sense_valid && sshdr.sense_key == NOT_READY) {
1169 if (sshdr.asc == 4 && sshdr.ascq == 3)
1170 break; /* manual intervention required */
1171 if (sshdr.asc == 4 && sshdr.ascq == 0xb)
1172 break; /* standby */
1173 if (sshdr.asc == 4 && sshdr.ascq == 0xc)
1174 break; /* unavailable */
1175 /*
1176 * Issue command to spin up drive when not ready
1177 */
1178 if (!spintime) {
1179 sd_printk(KERN_NOTICE, sdkp, "Spinning up disk...");
1180 cmd[0] = START_STOP;
1181 cmd[1] = 1; /* Return immediately */
1182 memset((void *) &cmd[2], 0, 8);
1183 cmd[4] = 1; /* Start spin cycle */
1184 if (sdkp->device->start_stop_pwr_cond)
1185 cmd[4] |= 1 << 4;
1186 scsi_execute_req(sdkp->device, cmd, DMA_NONE,
1187 NULL, 0, &sshdr,
1188 SD_TIMEOUT, SD_MAX_RETRIES,
1189 NULL);
1190 spintime_expire = jiffies + 100 * HZ;
1191 spintime = 1;
1192 }
1193 /* Wait 1 second for next try */
1194 msleep(1000);
1195 printk(".");
1196
1197 /*
1198 * Wait for USB flash devices with slow firmware.
1199 * Yes, this sense key/ASC combination shouldn't
1200 * occur here. It's characteristic of these devices.
1201 */
1202 } else if (sense_valid &&
1203 sshdr.sense_key == UNIT_ATTENTION &&
1204 sshdr.asc == 0x28) {
1205 if (!spintime) {
1206 spintime_expire = jiffies + 5 * HZ;
1207 spintime = 1;
1208 }
1209 /* Wait 1 second for next try */
1210 msleep(1000);
1211 } else {
1212 /* we don't understand the sense code, so it's
1213 * probably pointless to loop */
1214 if(!spintime) {
1215 sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n");
1216 sd_print_sense_hdr(sdkp, &sshdr);
1217 }
1218 break;
1219 }
1220
1221 } while (spintime && time_before_eq(jiffies, spintime_expire));
1222
1223 if (spintime) {
1224 if (scsi_status_is_good(the_result))
1225 printk("ready\n");
1226 else
1227 printk("not responding...\n");
1228 }
1229 }
1230
1231
1232 /*
1233 * Determine whether disk supports Data Integrity Field.
1234 */
1235 void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer)
1236 {
1237 struct scsi_device *sdp = sdkp->device;
1238 u8 type;
1239
1240 if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0)
1241 type = 0;
1242 else
1243 type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */
1244
1245 sdkp->protection_type = type;
1246
1247 switch (type) {
1248 case SD_DIF_TYPE0_PROTECTION:
1249 case SD_DIF_TYPE1_PROTECTION:
1250 case SD_DIF_TYPE3_PROTECTION:
1251 break;
1252
1253 case SD_DIF_TYPE2_PROTECTION:
1254 sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \
1255 "protection which is currently unsupported. " \
1256 "Disabling disk!\n");
1257 goto disable;
1258
1259 default:
1260 sd_printk(KERN_ERR, sdkp, "formatted with unknown " \
1261 "protection type %d. Disabling disk!\n", type);
1262 goto disable;
1263 }
1264
1265 return;
1266
1267 disable:
1268 sdkp->capacity = 0;
1269 }
1270
1271 static void read_capacity_error(struct scsi_disk *sdkp, struct scsi_device *sdp,
1272 struct scsi_sense_hdr *sshdr, int sense_valid,
1273 int the_result)
1274 {
1275 sd_print_result(sdkp, the_result);
1276 if (driver_byte(the_result) & DRIVER_SENSE)
1277 sd_print_sense_hdr(sdkp, sshdr);
1278 else
1279 sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n");
1280
1281 /*
1282 * Set dirty bit for removable devices if not ready -
1283 * sometimes drives will not report this properly.
1284 */
1285 if (sdp->removable &&
1286 sense_valid && sshdr->sense_key == NOT_READY)
1287 sdp->changed = 1;
1288
1289 /*
1290 * We used to set media_present to 0 here to indicate no media
1291 * in the drive, but some drives fail read capacity even with
1292 * media present, so we can't do that.
1293 */
1294 sdkp->capacity = 0; /* unknown mapped to zero - as usual */
1295 }
1296
1297 #define RC16_LEN 32
1298 #if RC16_LEN > SD_BUF_SIZE
1299 #error RC16_LEN must not be more than SD_BUF_SIZE
1300 #endif
1301
1302 static int read_capacity_16(struct scsi_disk *sdkp, struct scsi_device *sdp,
1303 unsigned char *buffer)
1304 {
1305 unsigned char cmd[16];
1306 struct scsi_sense_hdr sshdr;
1307 int sense_valid = 0;
1308 int the_result;
1309 int retries = 3;
1310 unsigned int alignment;
1311 unsigned long long lba;
1312 unsigned sector_size;
1313
1314 do {
1315 memset(cmd, 0, 16);
1316 cmd[0] = SERVICE_ACTION_IN;
1317 cmd[1] = SAI_READ_CAPACITY_16;
1318 cmd[13] = RC16_LEN;
1319 memset(buffer, 0, RC16_LEN);
1320
1321 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1322 buffer, RC16_LEN, &sshdr,
1323 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1324
1325 if (media_not_present(sdkp, &sshdr))
1326 return -ENODEV;
1327
1328 if (the_result) {
1329 sense_valid = scsi_sense_valid(&sshdr);
1330 if (sense_valid &&
1331 sshdr.sense_key == ILLEGAL_REQUEST &&
1332 (sshdr.asc == 0x20 || sshdr.asc == 0x24) &&
1333 sshdr.ascq == 0x00)
1334 /* Invalid Command Operation Code or
1335 * Invalid Field in CDB, just retry
1336 * silently with RC10 */
1337 return -EINVAL;
1338 }
1339 retries--;
1340
1341 } while (the_result && retries);
1342
1343 if (the_result) {
1344 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n");
1345 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1346 return -EINVAL;
1347 }
1348
1349 sector_size = get_unaligned_be32(&buffer[8]);
1350 lba = get_unaligned_be64(&buffer[0]);
1351
1352 sd_read_protection_type(sdkp, buffer);
1353
1354 if ((sizeof(sdkp->capacity) == 4) && (lba >= 0xffffffffULL)) {
1355 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1356 "kernel compiled with support for large block "
1357 "devices.\n");
1358 sdkp->capacity = 0;
1359 return -EOVERFLOW;
1360 }
1361
1362 /* Logical blocks per physical block exponent */
1363 sdkp->hw_sector_size = (1 << (buffer[13] & 0xf)) * sector_size;
1364
1365 /* Lowest aligned logical block */
1366 alignment = ((buffer[14] & 0x3f) << 8 | buffer[15]) * sector_size;
1367 blk_queue_alignment_offset(sdp->request_queue, alignment);
1368 if (alignment && sdkp->first_scan)
1369 sd_printk(KERN_NOTICE, sdkp,
1370 "physical block alignment offset: %u\n", alignment);
1371
1372 sdkp->capacity = lba + 1;
1373 return sector_size;
1374 }
1375
1376 static int read_capacity_10(struct scsi_disk *sdkp, struct scsi_device *sdp,
1377 unsigned char *buffer)
1378 {
1379 unsigned char cmd[16];
1380 struct scsi_sense_hdr sshdr;
1381 int sense_valid = 0;
1382 int the_result;
1383 int retries = 3;
1384 sector_t lba;
1385 unsigned sector_size;
1386
1387 do {
1388 cmd[0] = READ_CAPACITY;
1389 memset(&cmd[1], 0, 9);
1390 memset(buffer, 0, 8);
1391
1392 the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE,
1393 buffer, 8, &sshdr,
1394 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
1395
1396 if (media_not_present(sdkp, &sshdr))
1397 return -ENODEV;
1398
1399 if (the_result)
1400 sense_valid = scsi_sense_valid(&sshdr);
1401 retries--;
1402
1403 } while (the_result && retries);
1404
1405 if (the_result) {
1406 sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n");
1407 read_capacity_error(sdkp, sdp, &sshdr, sense_valid, the_result);
1408 return -EINVAL;
1409 }
1410
1411 sector_size = get_unaligned_be32(&buffer[4]);
1412 lba = get_unaligned_be32(&buffer[0]);
1413
1414 if ((sizeof(sdkp->capacity) == 4) && (lba == 0xffffffff)) {
1415 sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use a "
1416 "kernel compiled with support for large block "
1417 "devices.\n");
1418 sdkp->capacity = 0;
1419 return -EOVERFLOW;
1420 }
1421
1422 sdkp->capacity = lba + 1;
1423 sdkp->hw_sector_size = sector_size;
1424 return sector_size;
1425 }
1426
1427 static int sd_try_rc16_first(struct scsi_device *sdp)
1428 {
1429 if (sdp->scsi_level > SCSI_SPC_2)
1430 return 1;
1431 if (scsi_device_protection(sdp))
1432 return 1;
1433 return 0;
1434 }
1435
1436 /*
1437 * read disk capacity
1438 */
1439 static void
1440 sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer)
1441 {
1442 int sector_size;
1443 struct scsi_device *sdp = sdkp->device;
1444 sector_t old_capacity = sdkp->capacity;
1445
1446 if (sd_try_rc16_first(sdp)) {
1447 sector_size = read_capacity_16(sdkp, sdp, buffer);
1448 if (sector_size == -EOVERFLOW)
1449 goto got_data;
1450 if (sector_size == -ENODEV)
1451 return;
1452 if (sector_size < 0)
1453 sector_size = read_capacity_10(sdkp, sdp, buffer);
1454 if (sector_size < 0)
1455 return;
1456 } else {
1457 sector_size = read_capacity_10(sdkp, sdp, buffer);
1458 if (sector_size == -EOVERFLOW)
1459 goto got_data;
1460 if (sector_size < 0)
1461 return;
1462 if ((sizeof(sdkp->capacity) > 4) &&
1463 (sdkp->capacity > 0xffffffffULL)) {
1464 int old_sector_size = sector_size;
1465 sd_printk(KERN_NOTICE, sdkp, "Very big device. "
1466 "Trying to use READ CAPACITY(16).\n");
1467 sector_size = read_capacity_16(sdkp, sdp, buffer);
1468 if (sector_size < 0) {
1469 sd_printk(KERN_NOTICE, sdkp,
1470 "Using 0xffffffff as device size\n");
1471 sdkp->capacity = 1 + (sector_t) 0xffffffff;
1472 sector_size = old_sector_size;
1473 goto got_data;
1474 }
1475 }
1476 }
1477
1478 /* Some devices are known to return the total number of blocks,
1479 * not the highest block number. Some devices have versions
1480 * which do this and others which do not. Some devices we might
1481 * suspect of doing this but we don't know for certain.
1482 *
1483 * If we know the reported capacity is wrong, decrement it. If
1484 * we can only guess, then assume the number of blocks is even
1485 * (usually true but not always) and err on the side of lowering
1486 * the capacity.
1487 */
1488 if (sdp->fix_capacity ||
1489 (sdp->guess_capacity && (sdkp->capacity & 0x01))) {
1490 sd_printk(KERN_INFO, sdkp, "Adjusting the sector count "
1491 "from its reported value: %llu\n",
1492 (unsigned long long) sdkp->capacity);
1493 --sdkp->capacity;
1494 }
1495
1496 got_data:
1497 if (sector_size == 0) {
1498 sector_size = 512;
1499 sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, "
1500 "assuming 512.\n");
1501 }
1502
1503 if (sector_size != 512 &&
1504 sector_size != 1024 &&
1505 sector_size != 2048 &&
1506 sector_size != 4096 &&
1507 sector_size != 256) {
1508 sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n",
1509 sector_size);
1510 /*
1511 * The user might want to re-format the drive with
1512 * a supported sectorsize. Once this happens, it
1513 * would be relatively trivial to set the thing up.
1514 * For this reason, we leave the thing in the table.
1515 */
1516 sdkp->capacity = 0;
1517 /*
1518 * set a bogus sector size so the normal read/write
1519 * logic in the block layer will eventually refuse any
1520 * request on this device without tripping over power
1521 * of two sector size assumptions
1522 */
1523 sector_size = 512;
1524 }
1525 blk_queue_logical_block_size(sdp->request_queue, sector_size);
1526
1527 {
1528 char cap_str_2[10], cap_str_10[10];
1529 u64 sz = (u64)sdkp->capacity << ilog2(sector_size);
1530
1531 string_get_size(sz, STRING_UNITS_2, cap_str_2,
1532 sizeof(cap_str_2));
1533 string_get_size(sz, STRING_UNITS_10, cap_str_10,
1534 sizeof(cap_str_10));
1535
1536 if (sdkp->first_scan || old_capacity != sdkp->capacity) {
1537 sd_printk(KERN_NOTICE, sdkp,
1538 "%llu %d-byte logical blocks: (%s/%s)\n",
1539 (unsigned long long)sdkp->capacity,
1540 sector_size, cap_str_10, cap_str_2);
1541
1542 if (sdkp->hw_sector_size != sector_size)
1543 sd_printk(KERN_NOTICE, sdkp,
1544 "%u-byte physical blocks\n",
1545 sdkp->hw_sector_size);
1546 }
1547 }
1548
1549 /* Rescale capacity to 512-byte units */
1550 if (sector_size == 4096)
1551 sdkp->capacity <<= 3;
1552 else if (sector_size == 2048)
1553 sdkp->capacity <<= 2;
1554 else if (sector_size == 1024)
1555 sdkp->capacity <<= 1;
1556 else if (sector_size == 256)
1557 sdkp->capacity >>= 1;
1558
1559 blk_queue_physical_block_size(sdp->request_queue, sdkp->hw_sector_size);
1560 sdkp->device->sector_size = sector_size;
1561 }
1562
1563 /* called with buffer of length 512 */
1564 static inline int
1565 sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage,
1566 unsigned char *buffer, int len, struct scsi_mode_data *data,
1567 struct scsi_sense_hdr *sshdr)
1568 {
1569 return scsi_mode_sense(sdp, dbd, modepage, buffer, len,
1570 SD_TIMEOUT, SD_MAX_RETRIES, data,
1571 sshdr);
1572 }
1573
1574 /*
1575 * read write protect setting, if possible - called only in sd_revalidate_disk()
1576 * called with buffer of length SD_BUF_SIZE
1577 */
1578 static void
1579 sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer)
1580 {
1581 int res;
1582 struct scsi_device *sdp = sdkp->device;
1583 struct scsi_mode_data data;
1584 int old_wp = sdkp->write_prot;
1585
1586 set_disk_ro(sdkp->disk, 0);
1587 if (sdp->skip_ms_page_3f) {
1588 sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n");
1589 return;
1590 }
1591
1592 if (sdp->use_192_bytes_for_3f) {
1593 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL);
1594 } else {
1595 /*
1596 * First attempt: ask for all pages (0x3F), but only 4 bytes.
1597 * We have to start carefully: some devices hang if we ask
1598 * for more than is available.
1599 */
1600 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL);
1601
1602 /*
1603 * Second attempt: ask for page 0 When only page 0 is
1604 * implemented, a request for page 3F may return Sense Key
1605 * 5: Illegal Request, Sense Code 24: Invalid field in
1606 * CDB.
1607 */
1608 if (!scsi_status_is_good(res))
1609 res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL);
1610
1611 /*
1612 * Third attempt: ask 255 bytes, as we did earlier.
1613 */
1614 if (!scsi_status_is_good(res))
1615 res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255,
1616 &data, NULL);
1617 }
1618
1619 if (!scsi_status_is_good(res)) {
1620 sd_printk(KERN_WARNING, sdkp,
1621 "Test WP failed, assume Write Enabled\n");
1622 } else {
1623 sdkp->write_prot = ((data.device_specific & 0x80) != 0);
1624 set_disk_ro(sdkp->disk, sdkp->write_prot);
1625 if (sdkp->first_scan || old_wp != sdkp->write_prot) {
1626 sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n",
1627 sdkp->write_prot ? "on" : "off");
1628 sd_printk(KERN_DEBUG, sdkp,
1629 "Mode Sense: %02x %02x %02x %02x\n",
1630 buffer[0], buffer[1], buffer[2], buffer[3]);
1631 }
1632 }
1633 }
1634
1635 /*
1636 * sd_read_cache_type - called only from sd_revalidate_disk()
1637 * called with buffer of length SD_BUF_SIZE
1638 */
1639 static void
1640 sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer)
1641 {
1642 int len = 0, res;
1643 struct scsi_device *sdp = sdkp->device;
1644
1645 int dbd;
1646 int modepage;
1647 struct scsi_mode_data data;
1648 struct scsi_sense_hdr sshdr;
1649 int old_wce = sdkp->WCE;
1650 int old_rcd = sdkp->RCD;
1651 int old_dpofua = sdkp->DPOFUA;
1652
1653 if (sdp->skip_ms_page_8)
1654 goto defaults;
1655
1656 if (sdp->type == TYPE_RBC) {
1657 modepage = 6;
1658 dbd = 8;
1659 } else {
1660 modepage = 8;
1661 dbd = 0;
1662 }
1663
1664 /* cautiously ask */
1665 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr);
1666
1667 if (!scsi_status_is_good(res))
1668 goto bad_sense;
1669
1670 if (!data.header_length) {
1671 modepage = 6;
1672 sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n");
1673 }
1674
1675 /* that went OK, now ask for the proper length */
1676 len = data.length;
1677
1678 /*
1679 * We're only interested in the first three bytes, actually.
1680 * But the data cache page is defined for the first 20.
1681 */
1682 if (len < 3)
1683 goto bad_sense;
1684 if (len > 20)
1685 len = 20;
1686
1687 /* Take headers and block descriptors into account */
1688 len += data.header_length + data.block_descriptor_length;
1689 if (len > SD_BUF_SIZE)
1690 goto bad_sense;
1691
1692 /* Get the data */
1693 res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr);
1694
1695 if (scsi_status_is_good(res)) {
1696 int offset = data.header_length + data.block_descriptor_length;
1697
1698 if (offset >= SD_BUF_SIZE - 2) {
1699 sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n");
1700 goto defaults;
1701 }
1702
1703 if ((buffer[offset] & 0x3f) != modepage) {
1704 sd_printk(KERN_ERR, sdkp, "Got wrong page\n");
1705 goto defaults;
1706 }
1707
1708 if (modepage == 8) {
1709 sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0);
1710 sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0);
1711 } else {
1712 sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0);
1713 sdkp->RCD = 0;
1714 }
1715
1716 sdkp->DPOFUA = (data.device_specific & 0x10) != 0;
1717 if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) {
1718 sd_printk(KERN_NOTICE, sdkp,
1719 "Uses READ/WRITE(6), disabling FUA\n");
1720 sdkp->DPOFUA = 0;
1721 }
1722
1723 if (sdkp->first_scan || old_wce != sdkp->WCE ||
1724 old_rcd != sdkp->RCD || old_dpofua != sdkp->DPOFUA)
1725 sd_printk(KERN_NOTICE, sdkp,
1726 "Write cache: %s, read cache: %s, %s\n",
1727 sdkp->WCE ? "enabled" : "disabled",
1728 sdkp->RCD ? "disabled" : "enabled",
1729 sdkp->DPOFUA ? "supports DPO and FUA"
1730 : "doesn't support DPO or FUA");
1731
1732 return;
1733 }
1734
1735 bad_sense:
1736 if (scsi_sense_valid(&sshdr) &&
1737 sshdr.sense_key == ILLEGAL_REQUEST &&
1738 sshdr.asc == 0x24 && sshdr.ascq == 0x0)
1739 /* Invalid field in CDB */
1740 sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n");
1741 else
1742 sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n");
1743
1744 defaults:
1745 sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n");
1746 sdkp->WCE = 0;
1747 sdkp->RCD = 0;
1748 sdkp->DPOFUA = 0;
1749 }
1750
1751 /*
1752 * The ATO bit indicates whether the DIF application tag is available
1753 * for use by the operating system.
1754 */
1755 void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer)
1756 {
1757 int res, offset;
1758 struct scsi_device *sdp = sdkp->device;
1759 struct scsi_mode_data data;
1760 struct scsi_sense_hdr sshdr;
1761
1762 if (sdp->type != TYPE_DISK)
1763 return;
1764
1765 if (sdkp->protection_type == 0)
1766 return;
1767
1768 res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT,
1769 SD_MAX_RETRIES, &data, &sshdr);
1770
1771 if (!scsi_status_is_good(res) || !data.header_length ||
1772 data.length < 6) {
1773 sd_printk(KERN_WARNING, sdkp,
1774 "getting Control mode page failed, assume no ATO\n");
1775
1776 if (scsi_sense_valid(&sshdr))
1777 sd_print_sense_hdr(sdkp, &sshdr);
1778
1779 return;
1780 }
1781
1782 offset = data.header_length + data.block_descriptor_length;
1783
1784 if ((buffer[offset] & 0x3f) != 0x0a) {
1785 sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n");
1786 return;
1787 }
1788
1789 if ((buffer[offset + 5] & 0x80) == 0)
1790 return;
1791
1792 sdkp->ATO = 1;
1793
1794 return;
1795 }
1796
1797 /**
1798 * sd_read_block_limits - Query disk device for preferred I/O sizes.
1799 * @disk: disk to query
1800 */
1801 static void sd_read_block_limits(struct scsi_disk *sdkp)
1802 {
1803 unsigned int sector_sz = sdkp->device->sector_size;
1804 char *buffer;
1805
1806 /* Block Limits VPD */
1807 buffer = scsi_get_vpd_page(sdkp->device, 0xb0);
1808
1809 if (buffer == NULL)
1810 return;
1811
1812 blk_queue_io_min(sdkp->disk->queue,
1813 get_unaligned_be16(&buffer[6]) * sector_sz);
1814 blk_queue_io_opt(sdkp->disk->queue,
1815 get_unaligned_be32(&buffer[12]) * sector_sz);
1816
1817 kfree(buffer);
1818 }
1819
1820 /**
1821 * sd_read_block_characteristics - Query block dev. characteristics
1822 * @disk: disk to query
1823 */
1824 static void sd_read_block_characteristics(struct scsi_disk *sdkp)
1825 {
1826 char *buffer;
1827 u16 rot;
1828
1829 /* Block Device Characteristics VPD */
1830 buffer = scsi_get_vpd_page(sdkp->device, 0xb1);
1831
1832 if (buffer == NULL)
1833 return;
1834
1835 rot = get_unaligned_be16(&buffer[4]);
1836
1837 if (rot == 1)
1838 queue_flag_set_unlocked(QUEUE_FLAG_NONROT, sdkp->disk->queue);
1839
1840 kfree(buffer);
1841 }
1842
1843 /**
1844 * sd_revalidate_disk - called the first time a new disk is seen,
1845 * performs disk spin up, read_capacity, etc.
1846 * @disk: struct gendisk we care about
1847 **/
1848 static int sd_revalidate_disk(struct gendisk *disk)
1849 {
1850 struct scsi_disk *sdkp = scsi_disk(disk);
1851 struct scsi_device *sdp = sdkp->device;
1852 unsigned char *buffer;
1853 unsigned ordered;
1854
1855 SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
1856 "sd_revalidate_disk\n"));
1857
1858 /*
1859 * If the device is offline, don't try and read capacity or any
1860 * of the other niceties.
1861 */
1862 if (!scsi_device_online(sdp))
1863 goto out;
1864
1865 buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL);
1866 if (!buffer) {
1867 sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory "
1868 "allocation failure.\n");
1869 goto out;
1870 }
1871
1872 sd_spinup_disk(sdkp);
1873
1874 /*
1875 * Without media there is no reason to ask; moreover, some devices
1876 * react badly if we do.
1877 */
1878 if (sdkp->media_present) {
1879 sd_read_capacity(sdkp, buffer);
1880 sd_read_block_limits(sdkp);
1881 sd_read_block_characteristics(sdkp);
1882 sd_read_write_protect_flag(sdkp, buffer);
1883 sd_read_cache_type(sdkp, buffer);
1884 sd_read_app_tag_own(sdkp, buffer);
1885 }
1886
1887 sdkp->first_scan = 0;
1888
1889 /*
1890 * We now have all cache related info, determine how we deal
1891 * with ordered requests. Note that as the current SCSI
1892 * dispatch function can alter request order, we cannot use
1893 * QUEUE_ORDERED_TAG_* even when ordered tag is supported.
1894 */
1895 if (sdkp->WCE)
1896 ordered = sdkp->DPOFUA
1897 ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH;
1898 else
1899 ordered = QUEUE_ORDERED_DRAIN;
1900
1901 blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush);
1902
1903 set_capacity(disk, sdkp->capacity);
1904 kfree(buffer);
1905
1906 out:
1907 return 0;
1908 }
1909
1910 /**
1911 * sd_format_disk_name - format disk name
1912 * @prefix: name prefix - ie. "sd" for SCSI disks
1913 * @index: index of the disk to format name for
1914 * @buf: output buffer
1915 * @buflen: length of the output buffer
1916 *
1917 * SCSI disk names starts at sda. The 26th device is sdz and the
1918 * 27th is sdaa. The last one for two lettered suffix is sdzz
1919 * which is followed by sdaaa.
1920 *
1921 * This is basically 26 base counting with one extra 'nil' entry
1922 * at the beggining from the second digit on and can be
1923 * determined using similar method as 26 base conversion with the
1924 * index shifted -1 after each digit is computed.
1925 *
1926 * CONTEXT:
1927 * Don't care.
1928 *
1929 * RETURNS:
1930 * 0 on success, -errno on failure.
1931 */
1932 static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
1933 {
1934 const int base = 'z' - 'a' + 1;
1935 char *begin = buf + strlen(prefix);
1936 char *end = buf + buflen;
1937 char *p;
1938 int unit;
1939
1940 p = end - 1;
1941 *p = '\0';
1942 unit = base;
1943 do {
1944 if (p == begin)
1945 return -EINVAL;
1946 *--p = 'a' + (index % unit);
1947 index = (index / unit) - 1;
1948 } while (index >= 0);
1949
1950 memmove(begin, p, end - p);
1951 memcpy(buf, prefix, strlen(prefix));
1952
1953 return 0;
1954 }
1955
1956 /*
1957 * The asynchronous part of sd_probe
1958 */
1959 static void sd_probe_async(void *data, async_cookie_t cookie)
1960 {
1961 struct scsi_disk *sdkp = data;
1962 struct scsi_device *sdp;
1963 struct gendisk *gd;
1964 u32 index;
1965 struct device *dev;
1966
1967 sdp = sdkp->device;
1968 gd = sdkp->disk;
1969 index = sdkp->index;
1970 dev = &sdp->sdev_gendev;
1971
1972 if (index < SD_MAX_DISKS) {
1973 gd->major = sd_major((index & 0xf0) >> 4);
1974 gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
1975 gd->minors = SD_MINORS;
1976 }
1977 gd->fops = &sd_fops;
1978 gd->private_data = &sdkp->driver;
1979 gd->queue = sdkp->device->request_queue;
1980
1981 /* defaults, until the device tells us otherwise */
1982 sdp->sector_size = 512;
1983 sdkp->capacity = 0;
1984 sdkp->media_present = 1;
1985 sdkp->write_prot = 0;
1986 sdkp->WCE = 0;
1987 sdkp->RCD = 0;
1988 sdkp->ATO = 0;
1989 sdkp->first_scan = 1;
1990
1991 sd_revalidate_disk(gd);
1992
1993 blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
1994
1995 gd->driverfs_dev = &sdp->sdev_gendev;
1996 gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;
1997 if (sdp->removable)
1998 gd->flags |= GENHD_FL_REMOVABLE;
1999
2000 dev_set_drvdata(dev, sdkp);
2001 add_disk(gd);
2002 sd_dif_config_host(sdkp);
2003
2004 sd_revalidate_disk(gd);
2005
2006 sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
2007 sdp->removable ? "removable " : "");
2008 }
2009
2010 /**
2011 * sd_probe - called during driver initialization and whenever a
2012 * new scsi device is attached to the system. It is called once
2013 * for each scsi device (not just disks) present.
2014 * @dev: pointer to device object
2015 *
2016 * Returns 0 if successful (or not interested in this scsi device
2017 * (e.g. scanner)); 1 when there is an error.
2018 *
2019 * Note: this function is invoked from the scsi mid-level.
2020 * This function sets up the mapping between a given
2021 * <host,channel,id,lun> (found in sdp) and new device name
2022 * (e.g. /dev/sda). More precisely it is the block device major
2023 * and minor number that is chosen here.
2024 *
2025 * Assume sd_attach is not re-entrant (for time being)
2026 * Also think about sd_attach() and sd_remove() running coincidentally.
2027 **/
2028 static int sd_probe(struct device *dev)
2029 {
2030 struct scsi_device *sdp = to_scsi_device(dev);
2031 struct scsi_disk *sdkp;
2032 struct gendisk *gd;
2033 u32 index;
2034 int error;
2035
2036 error = -ENODEV;
2037 if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC)
2038 goto out;
2039
2040 SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp,
2041 "sd_attach\n"));
2042
2043 error = -ENOMEM;
2044 sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL);
2045 if (!sdkp)
2046 goto out;
2047
2048 gd = alloc_disk(SD_MINORS);
2049 if (!gd)
2050 goto out_free;
2051
2052 do {
2053 if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
2054 goto out_put;
2055
2056 spin_lock(&sd_index_lock);
2057 error = ida_get_new(&sd_index_ida, &index);
2058 spin_unlock(&sd_index_lock);
2059 } while (error == -EAGAIN);
2060
2061 if (error)
2062 goto out_put;
2063
2064 error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
2065 if (error)
2066 goto out_free_index;
2067
2068 sdkp->device = sdp;
2069 sdkp->driver = &sd_template;
2070 sdkp->disk = gd;
2071 sdkp->index = index;
2072 sdkp->openers = 0;
2073 sdkp->previous_state = 1;
2074
2075 if (!sdp->request_queue->rq_timeout) {
2076 if (sdp->type != TYPE_MOD)
2077 blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
2078 else
2079 blk_queue_rq_timeout(sdp->request_queue,
2080 SD_MOD_TIMEOUT);
2081 }
2082
2083 device_initialize(&sdkp->dev);
2084 sdkp->dev.parent = &sdp->sdev_gendev;
2085 sdkp->dev.class = &sd_disk_class;
2086 dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev));
2087
2088 if (device_add(&sdkp->dev))
2089 goto out_free_index;
2090
2091 get_device(&sdp->sdev_gendev);
2092
2093 async_schedule(sd_probe_async, sdkp);
2094
2095 return 0;
2096
2097 out_free_index:
2098 spin_lock(&sd_index_lock);
2099 ida_remove(&sd_index_ida, index);
2100 spin_unlock(&sd_index_lock);
2101 out_put:
2102 put_disk(gd);
2103 out_free:
2104 kfree(sdkp);
2105 out:
2106 return error;
2107 }
2108
2109 /**
2110 * sd_remove - called whenever a scsi disk (previously recognized by
2111 * sd_probe) is detached from the system. It is called (potentially
2112 * multiple times) during sd module unload.
2113 * @sdp: pointer to mid level scsi device object
2114 *
2115 * Note: this function is invoked from the scsi mid-level.
2116 * This function potentially frees up a device name (e.g. /dev/sdc)
2117 * that could be re-used by a subsequent sd_probe().
2118 * This function is not called when the built-in sd driver is "exit-ed".
2119 **/
2120 static int sd_remove(struct device *dev)
2121 {
2122 struct scsi_disk *sdkp;
2123
2124 async_synchronize_full();
2125 sdkp = dev_get_drvdata(dev);
2126 blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
2127 device_del(&sdkp->dev);
2128 del_gendisk(sdkp->disk);
2129 sd_shutdown(dev);
2130
2131 mutex_lock(&sd_ref_mutex);
2132 dev_set_drvdata(dev, NULL);
2133 put_device(&sdkp->dev);
2134 mutex_unlock(&sd_ref_mutex);
2135
2136 return 0;
2137 }
2138
2139 /**
2140 * scsi_disk_release - Called to free the scsi_disk structure
2141 * @dev: pointer to embedded class device
2142 *
2143 * sd_ref_mutex must be held entering this routine. Because it is
2144 * called on last put, you should always use the scsi_disk_get()
2145 * scsi_disk_put() helpers which manipulate the semaphore directly
2146 * and never do a direct put_device.
2147 **/
2148 static void scsi_disk_release(struct device *dev)
2149 {
2150 struct scsi_disk *sdkp = to_scsi_disk(dev);
2151 struct gendisk *disk = sdkp->disk;
2152
2153 spin_lock(&sd_index_lock);
2154 ida_remove(&sd_index_ida, sdkp->index);
2155 spin_unlock(&sd_index_lock);
2156
2157 disk->private_data = NULL;
2158 put_disk(disk);
2159 put_device(&sdkp->device->sdev_gendev);
2160
2161 kfree(sdkp);
2162 }
2163
2164 static int sd_start_stop_device(struct scsi_disk *sdkp, int start)
2165 {
2166 unsigned char cmd[6] = { START_STOP }; /* START_VALID */
2167 struct scsi_sense_hdr sshdr;
2168 struct scsi_device *sdp = sdkp->device;
2169 int res;
2170
2171 if (start)
2172 cmd[4] |= 1; /* START */
2173
2174 if (sdp->start_stop_pwr_cond)
2175 cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */
2176
2177 if (!scsi_device_online(sdp))
2178 return -ENODEV;
2179
2180 res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr,
2181 SD_TIMEOUT, SD_MAX_RETRIES, NULL);
2182 if (res) {
2183 sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n");
2184 sd_print_result(sdkp, res);
2185 if (driver_byte(res) & DRIVER_SENSE)
2186 sd_print_sense_hdr(sdkp, &sshdr);
2187 }
2188
2189 return res;
2190 }
2191
2192 /*
2193 * Send a SYNCHRONIZE CACHE instruction down to the device through
2194 * the normal SCSI command structure. Wait for the command to
2195 * complete.
2196 */
2197 static void sd_shutdown(struct device *dev)
2198 {
2199 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2200
2201 if (!sdkp)
2202 return; /* this can happen */
2203
2204 if (sdkp->WCE) {
2205 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2206 sd_sync_cache(sdkp);
2207 }
2208
2209 if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) {
2210 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2211 sd_start_stop_device(sdkp, 0);
2212 }
2213
2214 scsi_disk_put(sdkp);
2215 }
2216
2217 static int sd_suspend(struct device *dev, pm_message_t mesg)
2218 {
2219 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2220 int ret = 0;
2221
2222 if (!sdkp)
2223 return 0; /* this can happen */
2224
2225 if (sdkp->WCE) {
2226 sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n");
2227 ret = sd_sync_cache(sdkp);
2228 if (ret)
2229 goto done;
2230 }
2231
2232 if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) {
2233 sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n");
2234 ret = sd_start_stop_device(sdkp, 0);
2235 }
2236
2237 done:
2238 scsi_disk_put(sdkp);
2239 return ret;
2240 }
2241
2242 static int sd_resume(struct device *dev)
2243 {
2244 struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
2245 int ret = 0;
2246
2247 if (!sdkp->device->manage_start_stop)
2248 goto done;
2249
2250 sd_printk(KERN_NOTICE, sdkp, "Starting disk\n");
2251 ret = sd_start_stop_device(sdkp, 1);
2252
2253 done:
2254 scsi_disk_put(sdkp);
2255 return ret;
2256 }
2257
2258 /**
2259 * init_sd - entry point for this driver (both when built in or when
2260 * a module).
2261 *
2262 * Note: this function registers this driver with the scsi mid-level.
2263 **/
2264 static int __init init_sd(void)
2265 {
2266 int majors = 0, i, err;
2267
2268 SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n"));
2269
2270 for (i = 0; i < SD_MAJORS; i++)
2271 if (register_blkdev(sd_major(i), "sd") == 0)
2272 majors++;
2273
2274 if (!majors)
2275 return -ENODEV;
2276
2277 err = class_register(&sd_disk_class);
2278 if (err)
2279 goto err_out;
2280
2281 err = scsi_register_driver(&sd_template.gendrv);
2282 if (err)
2283 goto err_out_class;
2284
2285 return 0;
2286
2287 err_out_class:
2288 class_unregister(&sd_disk_class);
2289 err_out:
2290 for (i = 0; i < SD_MAJORS; i++)
2291 unregister_blkdev(sd_major(i), "sd");
2292 return err;
2293 }
2294
2295 /**
2296 * exit_sd - exit point for this driver (when it is a module).
2297 *
2298 * Note: this function unregisters this driver from the scsi mid-level.
2299 **/
2300 static void __exit exit_sd(void)
2301 {
2302 int i;
2303
2304 SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n"));
2305
2306 scsi_unregister_driver(&sd_template.gendrv);
2307 class_unregister(&sd_disk_class);
2308
2309 for (i = 0; i < SD_MAJORS; i++)
2310 unregister_blkdev(sd_major(i), "sd");
2311 }
2312
2313 module_init(init_sd);
2314 module_exit(exit_sd);
2315
2316 static void sd_print_sense_hdr(struct scsi_disk *sdkp,
2317 struct scsi_sense_hdr *sshdr)
2318 {
2319 sd_printk(KERN_INFO, sdkp, "");
2320 scsi_show_sense_hdr(sshdr);
2321 sd_printk(KERN_INFO, sdkp, "");
2322 scsi_show_extd_sense(sshdr->asc, sshdr->ascq);
2323 }
2324
2325 static void sd_print_result(struct scsi_disk *sdkp, int result)
2326 {
2327 sd_printk(KERN_INFO, sdkp, "");
2328 scsi_show_result(result);
2329 }
2330
Linux with added FPC-III support