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