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1da177e4 LT |
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 | ||
1da177e4 LT |
35 | #include <linux/module.h> |
36 | #include <linux/fs.h> | |
37 | #include <linux/kernel.h> | |
1da177e4 LT |
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> | |
1da177e4 | 48 | #include <linux/delay.h> |
0b950672 | 49 | #include <linux/mutex.h> |
7404ad3b | 50 | #include <linux/string_helpers.h> |
4ace92fc | 51 | #include <linux/async.h> |
1da177e4 LT |
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> | |
1da177e4 LT |
62 | #include <scsi/scsicam.h> |
63 | ||
aa91696e | 64 | #include "sd.h" |
1da177e4 LT |
65 | #include "scsi_logging.h" |
66 | ||
f018fa55 RH |
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); | |
d7b8bcb0 MT |
87 | MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); |
88 | MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); | |
89 | MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); | |
f018fa55 | 90 | |
870d6656 | 91 | #if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT) |
f615b48c | 92 | #define SD_MINORS 16 |
870d6656 | 93 | #else |
3e1a7ff8 | 94 | #define SD_MINORS 0 |
870d6656 TH |
95 | #endif |
96 | ||
7b3d9545 LT |
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); | |
ee959b00 | 106 | static void scsi_disk_release(struct device *cdev); |
7b3d9545 LT |
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 | ||
4034cc68 | 110 | static DEFINE_SPINLOCK(sd_index_lock); |
f27bac27 | 111 | static DEFINE_IDA(sd_index_ida); |
1da177e4 LT |
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) */ | |
0b950672 | 116 | static DEFINE_MUTEX(sd_ref_mutex); |
1da177e4 | 117 | |
6bdaa1f1 JB |
118 | static const char *sd_cache_types[] = { |
119 | "write through", "none", "write back", | |
120 | "write back, no read (daft)" | |
121 | }; | |
122 | ||
ee959b00 TJ |
123 | static ssize_t |
124 | sd_store_cache_type(struct device *dev, struct device_attribute *attr, | |
125 | const char *buf, size_t count) | |
6bdaa1f1 JB |
126 | { |
127 | int i, ct = -1, rcd, wce, sp; | |
ee959b00 | 128 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
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 | ||
6391a113 | 142 | for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { |
6bdaa1f1 JB |
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; | |
a9312fb8 | 157 | len = min_t(size_t, sizeof(buffer), data.length - data.header_length - |
6bdaa1f1 JB |
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)) | |
e73aec82 | 168 | sd_print_sense_hdr(sdkp, &sshdr); |
6bdaa1f1 JB |
169 | return -EINVAL; |
170 | } | |
f98a8cae | 171 | revalidate_disk(sdkp->disk); |
6bdaa1f1 JB |
172 | return count; |
173 | } | |
174 | ||
ee959b00 TJ |
175 | static ssize_t |
176 | sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, | |
177 | const char *buf, size_t count) | |
c3c94c5a | 178 | { |
ee959b00 | 179 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
c3c94c5a TH |
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 | ||
ee959b00 TJ |
190 | static ssize_t |
191 | sd_store_allow_restart(struct device *dev, struct device_attribute *attr, | |
192 | const char *buf, size_t count) | |
a144c5ae | 193 | { |
ee959b00 | 194 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
a144c5ae BK |
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 | ||
ee959b00 TJ |
208 | static ssize_t |
209 | sd_show_cache_type(struct device *dev, struct device_attribute *attr, | |
210 | char *buf) | |
6bdaa1f1 | 211 | { |
ee959b00 | 212 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
213 | int ct = sdkp->RCD + 2*sdkp->WCE; |
214 | ||
215 | return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); | |
216 | } | |
217 | ||
ee959b00 TJ |
218 | static ssize_t |
219 | sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) | |
6bdaa1f1 | 220 | { |
ee959b00 | 221 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
222 | |
223 | return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); | |
224 | } | |
225 | ||
ee959b00 TJ |
226 | static ssize_t |
227 | sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, | |
228 | char *buf) | |
c3c94c5a | 229 | { |
ee959b00 | 230 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
c3c94c5a TH |
231 | struct scsi_device *sdp = sdkp->device; |
232 | ||
233 | return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); | |
234 | } | |
235 | ||
ee959b00 TJ |
236 | static ssize_t |
237 | sd_show_allow_restart(struct device *dev, struct device_attribute *attr, | |
238 | char *buf) | |
a144c5ae | 239 | { |
ee959b00 | 240 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
a144c5ae BK |
241 | |
242 | return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); | |
243 | } | |
244 | ||
e0597d70 MP |
245 | static ssize_t |
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 | |
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 | ||
ee959b00 | 263 | static struct device_attribute sd_disk_attrs[] = { |
6bdaa1f1 JB |
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), | |
a144c5ae BK |
267 | __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, |
268 | sd_store_allow_restart), | |
c3c94c5a TH |
269 | __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, |
270 | sd_store_manage_start_stop), | |
e0597d70 MP |
271 | __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), |
272 | __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), | |
6bdaa1f1 JB |
273 | __ATTR_NULL, |
274 | }; | |
275 | ||
276 | static struct class sd_disk_class = { | |
277 | .name = "scsi_disk", | |
278 | .owner = THIS_MODULE, | |
ee959b00 TJ |
279 | .dev_release = scsi_disk_release, |
280 | .dev_attrs = sd_disk_attrs, | |
6bdaa1f1 | 281 | }; |
1da177e4 LT |
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, | |
c3c94c5a TH |
289 | .suspend = sd_suspend, |
290 | .resume = sd_resume, | |
1da177e4 LT |
291 | .shutdown = sd_shutdown, |
292 | }, | |
293 | .rescan = sd_rescan, | |
7b3d9545 | 294 | .done = sd_done, |
1da177e4 LT |
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 | */ | |
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 | ||
39b7f1e2 | 326 | static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) |
1da177e4 LT |
327 | { |
328 | struct scsi_disk *sdkp = NULL; | |
329 | ||
39b7f1e2 AS |
330 | if (disk->private_data) { |
331 | sdkp = scsi_disk(disk); | |
332 | if (scsi_device_get(sdkp->device) == 0) | |
ee959b00 | 333 | get_device(&sdkp->dev); |
39b7f1e2 AS |
334 | else |
335 | sdkp = NULL; | |
336 | } | |
337 | return sdkp; | |
338 | } | |
339 | ||
340 | static struct scsi_disk *scsi_disk_get(struct gendisk *disk) | |
341 | { | |
342 | struct scsi_disk *sdkp; | |
343 | ||
0b950672 | 344 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 345 | sdkp = __scsi_disk_get(disk); |
0b950672 | 346 | mutex_unlock(&sd_ref_mutex); |
1da177e4 | 347 | return sdkp; |
39b7f1e2 | 348 | } |
1da177e4 | 349 | |
39b7f1e2 AS |
350 | static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) |
351 | { | |
352 | struct scsi_disk *sdkp; | |
353 | ||
0b950672 | 354 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 AS |
355 | sdkp = dev_get_drvdata(dev); |
356 | if (sdkp) | |
357 | sdkp = __scsi_disk_get(sdkp->disk); | |
0b950672 | 358 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
359 | return sdkp; |
360 | } | |
361 | ||
362 | static void scsi_disk_put(struct scsi_disk *sdkp) | |
363 | { | |
364 | struct scsi_device *sdev = sdkp->device; | |
365 | ||
0b950672 | 366 | mutex_lock(&sd_ref_mutex); |
ee959b00 | 367 | put_device(&sdkp->dev); |
1da177e4 | 368 | scsi_device_put(sdev); |
0b950672 | 369 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
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 | **/ | |
7f9a6bc4 | 380 | static int sd_prep_fn(struct request_queue *q, struct request *rq) |
1da177e4 | 381 | { |
7f9a6bc4 JB |
382 | struct scsi_cmnd *SCpnt; |
383 | struct scsi_device *sdp = q->queuedata; | |
776b23a0 | 384 | struct gendisk *disk = rq->rq_disk; |
af55ff67 | 385 | struct scsi_disk *sdkp; |
776b23a0 | 386 | sector_t block = rq->sector; |
18351070 | 387 | sector_t threshold; |
7f9a6bc4 | 388 | unsigned int this_count = rq->nr_sectors; |
bd623e79 | 389 | int ret, host_dif; |
7f9a6bc4 JB |
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; | |
af55ff67 | 402 | sdkp = scsi_disk(disk); |
7f9a6bc4 JB |
403 | |
404 | /* from here on until we're complete, any goto out | |
405 | * is used for a killable error condition */ | |
406 | ret = BLKPREP_KILL; | |
1da177e4 | 407 | |
fa0d34be MP |
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)); | |
1da177e4 LT |
413 | |
414 | if (!sdp || !scsi_device_online(sdp) || | |
415 | block + rq->nr_sectors > get_capacity(disk)) { | |
fa0d34be MP |
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)); | |
7f9a6bc4 | 421 | goto out; |
1da177e4 LT |
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"); */ | |
7f9a6bc4 | 430 | goto out; |
1da177e4 | 431 | } |
7f9a6bc4 | 432 | |
a0899d4d | 433 | /* |
18351070 LT |
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. | |
a0899d4d | 436 | */ |
18351070 LT |
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 | } | |
a0899d4d | 449 | |
fa0d34be MP |
450 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", |
451 | (unsigned long long)block)); | |
1da177e4 LT |
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)) { | |
e73aec82 MP |
466 | scmd_printk(KERN_ERR, SCpnt, |
467 | "Bad block number requested\n"); | |
7f9a6bc4 | 468 | goto out; |
1da177e4 LT |
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)) { | |
e73aec82 MP |
476 | scmd_printk(KERN_ERR, SCpnt, |
477 | "Bad block number requested\n"); | |
7f9a6bc4 | 478 | goto out; |
1da177e4 LT |
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)) { | |
e73aec82 MP |
486 | scmd_printk(KERN_ERR, SCpnt, |
487 | "Bad block number requested\n"); | |
7f9a6bc4 | 488 | goto out; |
1da177e4 LT |
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) { | |
7f9a6bc4 | 496 | goto out; |
1da177e4 LT |
497 | } |
498 | SCpnt->cmnd[0] = WRITE_6; | |
499 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
af55ff67 MP |
500 | |
501 | if (blk_integrity_rq(rq) && | |
502 | sd_dif_prepare(rq, block, sdp->sector_size) == -EIO) | |
503 | goto out; | |
504 | ||
1da177e4 LT |
505 | } else if (rq_data_dir(rq) == READ) { |
506 | SCpnt->cmnd[0] = READ_6; | |
507 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
508 | } else { | |
e73aec82 | 509 | scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); |
7f9a6bc4 | 510 | goto out; |
1da177e4 LT |
511 | } |
512 | ||
fa0d34be MP |
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)); | |
1da177e4 | 518 | |
af55ff67 | 519 | /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ |
bd623e79 MP |
520 | host_dif = scsi_host_dif_capable(sdp->host, sdkp->protection_type); |
521 | if (host_dif) | |
af55ff67 MP |
522 | SCpnt->cmnd[1] = 1 << 5; |
523 | else | |
524 | SCpnt->cmnd[1] = 0; | |
525 | ||
1da177e4 LT |
526 | if (block > 0xffffffff) { |
527 | SCpnt->cmnd[0] += READ_16 - READ_6; | |
007365ad | 528 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
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) || | |
af55ff67 | 543 | scsi_device_protection(SCpnt->device) || |
1da177e4 LT |
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; | |
007365ad | 549 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
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 { | |
007365ad TH |
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 | */ | |
e73aec82 MP |
565 | scmd_printk(KERN_ERR, SCpnt, |
566 | "FUA write on READ/WRITE(6) drive\n"); | |
7f9a6bc4 | 567 | goto out; |
007365ad TH |
568 | } |
569 | ||
1da177e4 LT |
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 | } | |
30b0c37b | 576 | SCpnt->sdb.length = this_count * sdp->sector_size; |
1da177e4 | 577 | |
af55ff67 | 578 | /* If DIF or DIX is enabled, tell HBA how to handle request */ |
bd623e79 | 579 | if (host_dif || scsi_prot_sg_count(SCpnt)) |
9e06688e MP |
580 | sd_dif_op(SCpnt, host_dif, scsi_prot_sg_count(SCpnt), |
581 | sdkp->protection_type); | |
af55ff67 | 582 | |
1da177e4 LT |
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; | |
1da177e4 | 591 | |
1da177e4 LT |
592 | /* |
593 | * This indicates that the command is ready from our end to be | |
594 | * queued. | |
595 | */ | |
7f9a6bc4 JB |
596 | ret = BLKPREP_OK; |
597 | out: | |
598 | return scsi_prep_return(q, rq, ret); | |
1da177e4 LT |
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 | **/ | |
0338e291 | 614 | static int sd_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 615 | { |
0338e291 | 616 | struct scsi_disk *sdkp = scsi_disk_get(bdev->bd_disk); |
1da177e4 LT |
617 | struct scsi_device *sdev; |
618 | int retval; | |
619 | ||
0338e291 | 620 | if (!sdkp) |
1da177e4 LT |
621 | return -ENXIO; |
622 | ||
fa0d34be | 623 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); |
1da177e4 LT |
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) | |
0338e291 | 636 | check_disk_change(bdev); |
1da177e4 LT |
637 | |
638 | /* | |
639 | * If the drive is empty, just let the open fail. | |
640 | */ | |
641 | retval = -ENOMEDIUM; | |
0338e291 | 642 | if (sdev->removable && !sdkp->media_present && !(mode & FMODE_NDELAY)) |
1da177e4 LT |
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; | |
0338e291 | 650 | if (sdkp->write_prot && (mode & FMODE_WRITE)) |
1da177e4 LT |
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 | **/ | |
0338e291 | 686 | static int sd_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 687 | { |
1da177e4 LT |
688 | struct scsi_disk *sdkp = scsi_disk(disk); |
689 | struct scsi_device *sdev = sdkp->device; | |
690 | ||
56937f7b | 691 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); |
1da177e4 LT |
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 | ||
a885c8c4 | 706 | static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 LT |
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 | ||
a885c8c4 CH |
724 | geo->heads = diskinfo[0]; |
725 | geo->sectors = diskinfo[1]; | |
726 | geo->cylinders = diskinfo[2]; | |
1da177e4 LT |
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 | |
3a4fa0a2 | 742 | * down in the scsi subsystem. |
1da177e4 | 743 | **/ |
0338e291 | 744 | static int sd_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
745 | unsigned int cmd, unsigned long arg) |
746 | { | |
1da177e4 LT |
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 | */ | |
83ff6fe8 | 761 | error = scsi_nonblockable_ioctl(sdp, cmd, p, |
fd4ce1ac | 762 | (mode & FMODE_NDELAY) != 0); |
1da177e4 LT |
763 | if (!scsi_block_when_processing_errors(sdp) || !error) |
764 | return error; | |
765 | ||
1da177e4 LT |
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: | |
0338e291 | 776 | error = scsi_cmd_ioctl(disk->queue, disk, mode, cmd, p); |
1da177e4 LT |
777 | if (error != -ENOTTY) |
778 | return error; | |
779 | } | |
780 | return scsi_ioctl(sdp, cmd, p); | |
781 | } | |
782 | ||
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 | **/ | |
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; | |
001aac25 | 802 | struct scsi_sense_hdr *sshdr = NULL; |
1da177e4 LT |
803 | int retval; |
804 | ||
fa0d34be | 805 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); |
1da177e4 LT |
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 | */ | |
285e9670 KS |
816 | if (!scsi_device_online(sdp)) { |
817 | set_media_not_present(sdkp); | |
818 | retval = 1; | |
819 | goto out; | |
820 | } | |
1da177e4 LT |
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; | |
285e9670 | 832 | |
001aac25 JB |
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 | } | |
1da177e4 LT |
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 | */ | |
001aac25 JB |
845 | if (retval || (scsi_sense_valid(sshdr) && |
846 | /* 0x3a is medium not present */ | |
847 | sshdr->asc == 0x3a)) { | |
285e9670 KS |
848 | set_media_not_present(sdkp); |
849 | retval = 1; | |
850 | goto out; | |
851 | } | |
1da177e4 LT |
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; | |
285e9670 KS |
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; | |
001aac25 | 866 | kfree(sshdr); |
1da177e4 | 867 | return retval; |
1da177e4 LT |
868 | } |
869 | ||
e73aec82 | 870 | static int sd_sync_cache(struct scsi_disk *sdkp) |
1da177e4 | 871 | { |
1da177e4 | 872 | int retries, res; |
e73aec82 | 873 | struct scsi_device *sdp = sdkp->device; |
ea73a9f2 | 874 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
875 | |
876 | if (!scsi_device_online(sdp)) | |
877 | return -ENODEV; | |
878 | ||
1da177e4 | 879 | |
1da177e4 LT |
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 | */ | |
ea73a9f2 | 888 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, |
f4f4e47e | 889 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
ea73a9f2 | 890 | if (res == 0) |
1da177e4 LT |
891 | break; |
892 | } | |
893 | ||
e73aec82 MP |
894 | if (res) { |
895 | sd_print_result(sdkp, res); | |
896 | if (driver_byte(res) & DRIVER_SENSE) | |
897 | sd_print_sense_hdr(sdkp, &sshdr); | |
1da177e4 LT |
898 | } |
899 | ||
3721050a TH |
900 | if (res) |
901 | return -EIO; | |
902 | return 0; | |
1da177e4 LT |
903 | } |
904 | ||
165125e1 | 905 | static void sd_prepare_flush(struct request_queue *q, struct request *rq) |
1da177e4 | 906 | { |
4aff5e23 | 907 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
c0ed79a3 JB |
908 | rq->timeout = SD_TIMEOUT; |
909 | rq->cmd[0] = SYNCHRONIZE_CACHE; | |
461d4e90 | 910 | rq->cmd_len = 10; |
1da177e4 LT |
911 | } |
912 | ||
913 | static void sd_rescan(struct device *dev) | |
914 | { | |
39b7f1e2 AS |
915 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
916 | ||
917 | if (sdkp) { | |
f98a8cae | 918 | revalidate_disk(sdkp->disk); |
39b7f1e2 AS |
919 | scsi_disk_put(sdkp); |
920 | } | |
1da177e4 LT |
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 | */ | |
0338e291 AV |
929 | static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, |
930 | unsigned int cmd, unsigned long arg) | |
1da177e4 | 931 | { |
0338e291 | 932 | struct scsi_device *sdev = scsi_disk(bdev->bd_disk)->device; |
1da177e4 LT |
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, | |
0338e291 AV |
960 | .open = sd_open, |
961 | .release = sd_release, | |
962 | .locked_ioctl = sd_ioctl, | |
a885c8c4 | 963 | .getgeo = sd_getgeo, |
1da177e4 | 964 | #ifdef CONFIG_COMPAT |
0338e291 | 965 | .compat_ioctl = sd_compat_ioctl, |
1da177e4 LT |
966 | #endif |
967 | .media_changed = sd_media_changed, | |
968 | .revalidate_disk = sd_revalidate_disk, | |
969 | }; | |
970 | ||
af55ff67 MP |
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 | ||
1da177e4 | 1013 | /** |
7b3d9545 | 1014 | * sd_done - bottom half handler: called when the lower level |
1da177e4 LT |
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 | **/ | |
7b3d9545 | 1020 | static int sd_done(struct scsi_cmnd *SCpnt) |
1da177e4 LT |
1021 | { |
1022 | int result = SCpnt->result; | |
af55ff67 | 1023 | unsigned int good_bytes = result ? 0 : scsi_bufflen(SCpnt); |
1da177e4 LT |
1024 | struct scsi_sense_hdr sshdr; |
1025 | int sense_valid = 0; | |
1026 | int sense_deferred = 0; | |
1da177e4 LT |
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 | } | |
1da177e4 | 1033 | #ifdef CONFIG_SCSI_LOGGING |
fa0d34be | 1034 | SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt)); |
1da177e4 | 1035 | if (sense_valid) { |
fa0d34be | 1036 | SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt, |
7b3d9545 | 1037 | "sd_done: sb[respc,sk,asc," |
fa0d34be MP |
1038 | "ascq]=%x,%x,%x,%x\n", |
1039 | sshdr.response_code, | |
1040 | sshdr.sense_key, sshdr.asc, | |
1041 | sshdr.ascq)); | |
1da177e4 LT |
1042 | } |
1043 | #endif | |
03aba2f7 LT |
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: | |
af55ff67 | 1051 | good_bytes = sd_completed_bytes(SCpnt); |
03aba2f7 LT |
1052 | break; |
1053 | case RECOVERED_ERROR: | |
03aba2f7 LT |
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); | |
af55ff67 MP |
1060 | good_bytes = scsi_bufflen(SCpnt); |
1061 | break; | |
10dab226 JW |
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; | |
af55ff67 MP |
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 | } | |
03aba2f7 LT |
1077 | break; |
1078 | case ILLEGAL_REQUEST: | |
af55ff67 MP |
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 | } | |
03aba2f7 LT |
1084 | break; |
1085 | default: | |
1086 | break; | |
1da177e4 | 1087 | } |
03aba2f7 | 1088 | out: |
af55ff67 MP |
1089 | if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) |
1090 | sd_dif_complete(SCpnt, good_bytes); | |
1091 | ||
7b3d9545 | 1092 | return good_bytes; |
1da177e4 LT |
1093 | } |
1094 | ||
ea73a9f2 JB |
1095 | static int media_not_present(struct scsi_disk *sdkp, |
1096 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 1097 | { |
1da177e4 | 1098 | |
ea73a9f2 | 1099 | if (!scsi_sense_valid(sshdr)) |
1da177e4 LT |
1100 | return 0; |
1101 | /* not invoked for commands that could return deferred errors */ | |
ea73a9f2 JB |
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 | ||
1da177e4 LT |
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 | |
e73aec82 | 1116 | sd_spinup_disk(struct scsi_disk *sdkp) |
ea73a9f2 | 1117 | { |
1da177e4 | 1118 | unsigned char cmd[10]; |
4451e472 | 1119 | unsigned long spintime_expire = 0; |
1da177e4 LT |
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 | ||
ea73a9f2 JB |
1136 | the_result = scsi_execute_req(sdkp->device, cmd, |
1137 | DMA_NONE, NULL, 0, | |
1138 | &sshdr, SD_TIMEOUT, | |
f4f4e47e | 1139 | SD_MAX_RETRIES, NULL); |
1da177e4 | 1140 | |
b4d38e38 AS |
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 | ||
1da177e4 | 1149 | if (the_result) |
ea73a9f2 | 1150 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
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 | ||
1da177e4 LT |
1157 | if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { |
1158 | /* no sense, TUR either succeeded or failed | |
1159 | * with a status error */ | |
e73aec82 MP |
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 | } | |
1da177e4 LT |
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 | ||
1174 | /* | |
1175 | * If manual intervention is required, or this is an | |
1176 | * absent USB storage device, a spinup is meaningless. | |
1177 | */ | |
1178 | if (sense_valid && | |
1179 | sshdr.sense_key == NOT_READY && | |
1180 | sshdr.asc == 4 && sshdr.ascq == 3) { | |
1181 | break; /* manual intervention required */ | |
1182 | ||
1183 | /* | |
1184 | * Issue command to spin up drive when not ready | |
1185 | */ | |
1186 | } else if (sense_valid && sshdr.sense_key == NOT_READY) { | |
1187 | if (!spintime) { | |
e73aec82 | 1188 | sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); |
1da177e4 LT |
1189 | cmd[0] = START_STOP; |
1190 | cmd[1] = 1; /* Return immediately */ | |
1191 | memset((void *) &cmd[2], 0, 8); | |
1192 | cmd[4] = 1; /* Start spin cycle */ | |
d2886ea3 SR |
1193 | if (sdkp->device->start_stop_pwr_cond) |
1194 | cmd[4] |= 1 << 4; | |
ea73a9f2 JB |
1195 | scsi_execute_req(sdkp->device, cmd, DMA_NONE, |
1196 | NULL, 0, &sshdr, | |
f4f4e47e FT |
1197 | SD_TIMEOUT, SD_MAX_RETRIES, |
1198 | NULL); | |
4451e472 AS |
1199 | spintime_expire = jiffies + 100 * HZ; |
1200 | spintime = 1; | |
1da177e4 | 1201 | } |
1da177e4 LT |
1202 | /* Wait 1 second for next try */ |
1203 | msleep(1000); | |
1204 | printk("."); | |
4451e472 AS |
1205 | |
1206 | /* | |
1207 | * Wait for USB flash devices with slow firmware. | |
1208 | * Yes, this sense key/ASC combination shouldn't | |
1209 | * occur here. It's characteristic of these devices. | |
1210 | */ | |
1211 | } else if (sense_valid && | |
1212 | sshdr.sense_key == UNIT_ATTENTION && | |
1213 | sshdr.asc == 0x28) { | |
1214 | if (!spintime) { | |
1215 | spintime_expire = jiffies + 5 * HZ; | |
1216 | spintime = 1; | |
1217 | } | |
1218 | /* Wait 1 second for next try */ | |
1219 | msleep(1000); | |
1da177e4 LT |
1220 | } else { |
1221 | /* we don't understand the sense code, so it's | |
1222 | * probably pointless to loop */ | |
1223 | if(!spintime) { | |
e73aec82 MP |
1224 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); |
1225 | sd_print_sense_hdr(sdkp, &sshdr); | |
1da177e4 LT |
1226 | } |
1227 | break; | |
1228 | } | |
1229 | ||
4451e472 | 1230 | } while (spintime && time_before_eq(jiffies, spintime_expire)); |
1da177e4 LT |
1231 | |
1232 | if (spintime) { | |
1233 | if (scsi_status_is_good(the_result)) | |
1234 | printk("ready\n"); | |
1235 | else | |
1236 | printk("not responding...\n"); | |
1237 | } | |
1238 | } | |
1239 | ||
e0597d70 MP |
1240 | |
1241 | /* | |
1242 | * Determine whether disk supports Data Integrity Field. | |
1243 | */ | |
1244 | void sd_read_protection_type(struct scsi_disk *sdkp, unsigned char *buffer) | |
1245 | { | |
1246 | struct scsi_device *sdp = sdkp->device; | |
1247 | u8 type; | |
1248 | ||
1249 | if (scsi_device_protection(sdp) == 0 || (buffer[12] & 1) == 0) | |
1250 | type = 0; | |
1251 | else | |
1252 | type = ((buffer[12] >> 1) & 7) + 1; /* P_TYPE 0 = Type 1 */ | |
1253 | ||
be922f47 MP |
1254 | sdkp->protection_type = type; |
1255 | ||
e0597d70 MP |
1256 | switch (type) { |
1257 | case SD_DIF_TYPE0_PROTECTION: | |
e0597d70 MP |
1258 | case SD_DIF_TYPE1_PROTECTION: |
1259 | case SD_DIF_TYPE3_PROTECTION: | |
e0597d70 MP |
1260 | break; |
1261 | ||
1262 | case SD_DIF_TYPE2_PROTECTION: | |
1263 | sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \ | |
1264 | "protection which is currently unsupported. " \ | |
1265 | "Disabling disk!\n"); | |
1266 | goto disable; | |
1267 | ||
1268 | default: | |
1269 | sd_printk(KERN_ERR, sdkp, "formatted with unknown " \ | |
1270 | "protection type %d. Disabling disk!\n", type); | |
1271 | goto disable; | |
1272 | } | |
1273 | ||
1274 | return; | |
1275 | ||
1276 | disable: | |
e0597d70 MP |
1277 | sdkp->capacity = 0; |
1278 | } | |
1279 | ||
1da177e4 LT |
1280 | /* |
1281 | * read disk capacity | |
1282 | */ | |
1283 | static void | |
e73aec82 | 1284 | sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) |
ea73a9f2 | 1285 | { |
1da177e4 | 1286 | unsigned char cmd[16]; |
1da177e4 LT |
1287 | int the_result, retries; |
1288 | int sector_size = 0; | |
e0597d70 MP |
1289 | /* Force READ CAPACITY(16) when PROTECT=1 */ |
1290 | int longrc = scsi_device_protection(sdkp->device) ? 1 : 0; | |
1da177e4 LT |
1291 | struct scsi_sense_hdr sshdr; |
1292 | int sense_valid = 0; | |
ea73a9f2 | 1293 | struct scsi_device *sdp = sdkp->device; |
1da177e4 LT |
1294 | |
1295 | repeat: | |
1296 | retries = 3; | |
1297 | do { | |
1298 | if (longrc) { | |
1299 | memset((void *) cmd, 0, 16); | |
1300 | cmd[0] = SERVICE_ACTION_IN; | |
1301 | cmd[1] = SAI_READ_CAPACITY_16; | |
e0597d70 MP |
1302 | cmd[13] = 13; |
1303 | memset((void *) buffer, 0, 13); | |
1da177e4 LT |
1304 | } else { |
1305 | cmd[0] = READ_CAPACITY; | |
1306 | memset((void *) &cmd[1], 0, 9); | |
1307 | memset((void *) buffer, 0, 8); | |
1308 | } | |
1309 | ||
ea73a9f2 | 1310 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, |
e0597d70 | 1311 | buffer, longrc ? 13 : 8, &sshdr, |
f4f4e47e | 1312 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
1da177e4 | 1313 | |
ea73a9f2 | 1314 | if (media_not_present(sdkp, &sshdr)) |
1da177e4 LT |
1315 | return; |
1316 | ||
1da177e4 | 1317 | if (the_result) |
ea73a9f2 | 1318 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1319 | retries--; |
1320 | ||
1321 | } while (the_result && retries); | |
1322 | ||
1323 | if (the_result && !longrc) { | |
e73aec82 MP |
1324 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); |
1325 | sd_print_result(sdkp, the_result); | |
1da177e4 | 1326 | if (driver_byte(the_result) & DRIVER_SENSE) |
e73aec82 | 1327 | sd_print_sense_hdr(sdkp, &sshdr); |
1da177e4 | 1328 | else |
e73aec82 | 1329 | sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); |
1da177e4 LT |
1330 | |
1331 | /* Set dirty bit for removable devices if not ready - | |
1332 | * sometimes drives will not report this properly. */ | |
1333 | if (sdp->removable && | |
1334 | sense_valid && sshdr.sense_key == NOT_READY) | |
1335 | sdp->changed = 1; | |
1336 | ||
1337 | /* Either no media are present but the drive didn't tell us, | |
1338 | or they are present but the read capacity command fails */ | |
1339 | /* sdkp->media_present = 0; -- not always correct */ | |
69bdd88c | 1340 | sdkp->capacity = 0; /* unknown mapped to zero - as usual */ |
1da177e4 LT |
1341 | |
1342 | return; | |
1343 | } else if (the_result && longrc) { | |
1344 | /* READ CAPACITY(16) has been failed */ | |
e73aec82 MP |
1345 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); |
1346 | sd_print_result(sdkp, the_result); | |
1347 | sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n"); | |
1348 | ||
1da177e4 LT |
1349 | sdkp->capacity = 1 + (sector_t) 0xffffffff; |
1350 | goto got_data; | |
1351 | } | |
1352 | ||
1353 | if (!longrc) { | |
1354 | sector_size = (buffer[4] << 24) | | |
1355 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
1356 | if (buffer[0] == 0xff && buffer[1] == 0xff && | |
1357 | buffer[2] == 0xff && buffer[3] == 0xff) { | |
1358 | if(sizeof(sdkp->capacity) > 4) { | |
e73aec82 MP |
1359 | sd_printk(KERN_NOTICE, sdkp, "Very big device. " |
1360 | "Trying to use READ CAPACITY(16).\n"); | |
1da177e4 LT |
1361 | longrc = 1; |
1362 | goto repeat; | |
1363 | } | |
e73aec82 MP |
1364 | sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use " |
1365 | "a kernel compiled with support for large " | |
1366 | "block devices.\n"); | |
1da177e4 LT |
1367 | sdkp->capacity = 0; |
1368 | goto got_data; | |
1369 | } | |
1370 | sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) | | |
1371 | (buffer[1] << 16) | | |
1372 | (buffer[2] << 8) | | |
1373 | buffer[3]); | |
1374 | } else { | |
1375 | sdkp->capacity = 1 + (((u64)buffer[0] << 56) | | |
1376 | ((u64)buffer[1] << 48) | | |
1377 | ((u64)buffer[2] << 40) | | |
1378 | ((u64)buffer[3] << 32) | | |
1379 | ((sector_t)buffer[4] << 24) | | |
1380 | ((sector_t)buffer[5] << 16) | | |
1381 | ((sector_t)buffer[6] << 8) | | |
1382 | (sector_t)buffer[7]); | |
1383 | ||
1384 | sector_size = (buffer[8] << 24) | | |
1385 | (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]; | |
e0597d70 MP |
1386 | |
1387 | sd_read_protection_type(sdkp, buffer); | |
1da177e4 LT |
1388 | } |
1389 | ||
1390 | /* Some devices return the total number of sectors, not the | |
1391 | * highest sector number. Make the necessary adjustment. */ | |
61bf54b7 | 1392 | if (sdp->fix_capacity) { |
1da177e4 LT |
1393 | --sdkp->capacity; |
1394 | ||
61bf54b7 ON |
1395 | /* Some devices have version which report the correct sizes |
1396 | * and others which do not. We guess size according to a heuristic | |
1397 | * and err on the side of lowering the capacity. */ | |
1398 | } else { | |
1399 | if (sdp->guess_capacity) | |
1400 | if (sdkp->capacity & 0x01) /* odd sizes are odd */ | |
1401 | --sdkp->capacity; | |
1402 | } | |
1403 | ||
1da177e4 LT |
1404 | got_data: |
1405 | if (sector_size == 0) { | |
1406 | sector_size = 512; | |
e73aec82 MP |
1407 | sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " |
1408 | "assuming 512.\n"); | |
1da177e4 LT |
1409 | } |
1410 | ||
1411 | if (sector_size != 512 && | |
1412 | sector_size != 1024 && | |
1413 | sector_size != 2048 && | |
1414 | sector_size != 4096 && | |
1415 | sector_size != 256) { | |
e73aec82 MP |
1416 | sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", |
1417 | sector_size); | |
1da177e4 LT |
1418 | /* |
1419 | * The user might want to re-format the drive with | |
1420 | * a supported sectorsize. Once this happens, it | |
1421 | * would be relatively trivial to set the thing up. | |
1422 | * For this reason, we leave the thing in the table. | |
1423 | */ | |
1424 | sdkp->capacity = 0; | |
1425 | /* | |
1426 | * set a bogus sector size so the normal read/write | |
1427 | * logic in the block layer will eventually refuse any | |
1428 | * request on this device without tripping over power | |
1429 | * of two sector size assumptions | |
1430 | */ | |
1431 | sector_size = 512; | |
1432 | } | |
7404ad3b JB |
1433 | blk_queue_hardsect_size(sdp->request_queue, sector_size); |
1434 | ||
1da177e4 | 1435 | { |
7404ad3b | 1436 | char cap_str_2[10], cap_str_10[10]; |
520a2c27 | 1437 | u64 sz = (u64)sdkp->capacity << ilog2(sector_size); |
1da177e4 | 1438 | |
7404ad3b JB |
1439 | string_get_size(sz, STRING_UNITS_2, cap_str_2, |
1440 | sizeof(cap_str_2)); | |
1441 | string_get_size(sz, STRING_UNITS_10, cap_str_10, | |
1442 | sizeof(cap_str_10)); | |
1da177e4 | 1443 | |
e73aec82 | 1444 | sd_printk(KERN_NOTICE, sdkp, |
7404ad3b | 1445 | "%llu %d-byte hardware sectors: (%s/%s)\n", |
e73aec82 | 1446 | (unsigned long long)sdkp->capacity, |
7404ad3b | 1447 | sector_size, cap_str_10, cap_str_2); |
1da177e4 LT |
1448 | } |
1449 | ||
1450 | /* Rescale capacity to 512-byte units */ | |
1451 | if (sector_size == 4096) | |
1452 | sdkp->capacity <<= 3; | |
1453 | else if (sector_size == 2048) | |
1454 | sdkp->capacity <<= 2; | |
1455 | else if (sector_size == 1024) | |
1456 | sdkp->capacity <<= 1; | |
1457 | else if (sector_size == 256) | |
1458 | sdkp->capacity >>= 1; | |
1459 | ||
1460 | sdkp->device->sector_size = sector_size; | |
1461 | } | |
1462 | ||
1463 | /* called with buffer of length 512 */ | |
1464 | static inline int | |
ea73a9f2 JB |
1465 | sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, |
1466 | unsigned char *buffer, int len, struct scsi_mode_data *data, | |
1467 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 1468 | { |
ea73a9f2 | 1469 | return scsi_mode_sense(sdp, dbd, modepage, buffer, len, |
1cf72699 | 1470 | SD_TIMEOUT, SD_MAX_RETRIES, data, |
ea73a9f2 | 1471 | sshdr); |
1da177e4 LT |
1472 | } |
1473 | ||
1474 | /* | |
1475 | * read write protect setting, if possible - called only in sd_revalidate_disk() | |
48970800 | 1476 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1477 | */ |
1478 | static void | |
e73aec82 | 1479 | sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) |
ea73a9f2 | 1480 | { |
1da177e4 | 1481 | int res; |
ea73a9f2 | 1482 | struct scsi_device *sdp = sdkp->device; |
1da177e4 LT |
1483 | struct scsi_mode_data data; |
1484 | ||
1485 | set_disk_ro(sdkp->disk, 0); | |
ea73a9f2 | 1486 | if (sdp->skip_ms_page_3f) { |
e73aec82 | 1487 | sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); |
1da177e4 LT |
1488 | return; |
1489 | } | |
1490 | ||
ea73a9f2 JB |
1491 | if (sdp->use_192_bytes_for_3f) { |
1492 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); | |
1da177e4 LT |
1493 | } else { |
1494 | /* | |
1495 | * First attempt: ask for all pages (0x3F), but only 4 bytes. | |
1496 | * We have to start carefully: some devices hang if we ask | |
1497 | * for more than is available. | |
1498 | */ | |
ea73a9f2 | 1499 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); |
1da177e4 LT |
1500 | |
1501 | /* | |
1502 | * Second attempt: ask for page 0 When only page 0 is | |
1503 | * implemented, a request for page 3F may return Sense Key | |
1504 | * 5: Illegal Request, Sense Code 24: Invalid field in | |
1505 | * CDB. | |
1506 | */ | |
1507 | if (!scsi_status_is_good(res)) | |
ea73a9f2 | 1508 | res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); |
1da177e4 LT |
1509 | |
1510 | /* | |
1511 | * Third attempt: ask 255 bytes, as we did earlier. | |
1512 | */ | |
1513 | if (!scsi_status_is_good(res)) | |
ea73a9f2 JB |
1514 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, |
1515 | &data, NULL); | |
1da177e4 LT |
1516 | } |
1517 | ||
1518 | if (!scsi_status_is_good(res)) { | |
e73aec82 MP |
1519 | sd_printk(KERN_WARNING, sdkp, |
1520 | "Test WP failed, assume Write Enabled\n"); | |
1da177e4 LT |
1521 | } else { |
1522 | sdkp->write_prot = ((data.device_specific & 0x80) != 0); | |
1523 | set_disk_ro(sdkp->disk, sdkp->write_prot); | |
e73aec82 MP |
1524 | sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", |
1525 | sdkp->write_prot ? "on" : "off"); | |
1526 | sd_printk(KERN_DEBUG, sdkp, | |
1527 | "Mode Sense: %02x %02x %02x %02x\n", | |
1528 | buffer[0], buffer[1], buffer[2], buffer[3]); | |
1da177e4 LT |
1529 | } |
1530 | } | |
1531 | ||
1532 | /* | |
1533 | * sd_read_cache_type - called only from sd_revalidate_disk() | |
48970800 | 1534 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1535 | */ |
1536 | static void | |
e73aec82 | 1537 | sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) |
631e8a13 | 1538 | { |
1da177e4 | 1539 | int len = 0, res; |
ea73a9f2 | 1540 | struct scsi_device *sdp = sdkp->device; |
1da177e4 | 1541 | |
631e8a13 AV |
1542 | int dbd; |
1543 | int modepage; | |
1da177e4 LT |
1544 | struct scsi_mode_data data; |
1545 | struct scsi_sense_hdr sshdr; | |
1546 | ||
ea73a9f2 | 1547 | if (sdp->skip_ms_page_8) |
1da177e4 LT |
1548 | goto defaults; |
1549 | ||
ea73a9f2 | 1550 | if (sdp->type == TYPE_RBC) { |
631e8a13 AV |
1551 | modepage = 6; |
1552 | dbd = 8; | |
1553 | } else { | |
1554 | modepage = 8; | |
1555 | dbd = 0; | |
1556 | } | |
1557 | ||
1da177e4 | 1558 | /* cautiously ask */ |
ea73a9f2 | 1559 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); |
1da177e4 LT |
1560 | |
1561 | if (!scsi_status_is_good(res)) | |
1562 | goto bad_sense; | |
1563 | ||
6d73c851 AV |
1564 | if (!data.header_length) { |
1565 | modepage = 6; | |
e73aec82 | 1566 | sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); |
6d73c851 AV |
1567 | } |
1568 | ||
1da177e4 LT |
1569 | /* that went OK, now ask for the proper length */ |
1570 | len = data.length; | |
1571 | ||
1572 | /* | |
1573 | * We're only interested in the first three bytes, actually. | |
1574 | * But the data cache page is defined for the first 20. | |
1575 | */ | |
1576 | if (len < 3) | |
1577 | goto bad_sense; | |
1578 | if (len > 20) | |
1579 | len = 20; | |
1580 | ||
1581 | /* Take headers and block descriptors into account */ | |
1582 | len += data.header_length + data.block_descriptor_length; | |
48970800 AV |
1583 | if (len > SD_BUF_SIZE) |
1584 | goto bad_sense; | |
1da177e4 LT |
1585 | |
1586 | /* Get the data */ | |
ea73a9f2 | 1587 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); |
1da177e4 LT |
1588 | |
1589 | if (scsi_status_is_good(res)) { | |
631e8a13 | 1590 | int offset = data.header_length + data.block_descriptor_length; |
1da177e4 | 1591 | |
48970800 | 1592 | if (offset >= SD_BUF_SIZE - 2) { |
e73aec82 | 1593 | sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); |
48970800 AV |
1594 | goto defaults; |
1595 | } | |
1596 | ||
631e8a13 | 1597 | if ((buffer[offset] & 0x3f) != modepage) { |
e73aec82 | 1598 | sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); |
631e8a13 AV |
1599 | goto defaults; |
1600 | } | |
1601 | ||
1602 | if (modepage == 8) { | |
1603 | sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); | |
1604 | sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); | |
1605 | } else { | |
1606 | sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); | |
1607 | sdkp->RCD = 0; | |
1608 | } | |
1da177e4 | 1609 | |
007365ad TH |
1610 | sdkp->DPOFUA = (data.device_specific & 0x10) != 0; |
1611 | if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { | |
e73aec82 MP |
1612 | sd_printk(KERN_NOTICE, sdkp, |
1613 | "Uses READ/WRITE(6), disabling FUA\n"); | |
007365ad TH |
1614 | sdkp->DPOFUA = 0; |
1615 | } | |
1616 | ||
e73aec82 MP |
1617 | sd_printk(KERN_NOTICE, sdkp, |
1618 | "Write cache: %s, read cache: %s, %s\n", | |
fd44bab5 LT |
1619 | sdkp->WCE ? "enabled" : "disabled", |
1620 | sdkp->RCD ? "disabled" : "enabled", | |
1621 | sdkp->DPOFUA ? "supports DPO and FUA" | |
1622 | : "doesn't support DPO or FUA"); | |
1da177e4 LT |
1623 | |
1624 | return; | |
1625 | } | |
1626 | ||
1627 | bad_sense: | |
ea73a9f2 | 1628 | if (scsi_sense_valid(&sshdr) && |
1da177e4 LT |
1629 | sshdr.sense_key == ILLEGAL_REQUEST && |
1630 | sshdr.asc == 0x24 && sshdr.ascq == 0x0) | |
e73aec82 MP |
1631 | /* Invalid field in CDB */ |
1632 | sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); | |
1da177e4 | 1633 | else |
e73aec82 | 1634 | sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); |
1da177e4 LT |
1635 | |
1636 | defaults: | |
e73aec82 | 1637 | sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); |
1da177e4 LT |
1638 | sdkp->WCE = 0; |
1639 | sdkp->RCD = 0; | |
48970800 | 1640 | sdkp->DPOFUA = 0; |
1da177e4 LT |
1641 | } |
1642 | ||
e0597d70 MP |
1643 | /* |
1644 | * The ATO bit indicates whether the DIF application tag is available | |
1645 | * for use by the operating system. | |
1646 | */ | |
1647 | void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) | |
1648 | { | |
1649 | int res, offset; | |
1650 | struct scsi_device *sdp = sdkp->device; | |
1651 | struct scsi_mode_data data; | |
1652 | struct scsi_sense_hdr sshdr; | |
1653 | ||
1654 | if (sdp->type != TYPE_DISK) | |
1655 | return; | |
1656 | ||
1657 | if (sdkp->protection_type == 0) | |
1658 | return; | |
1659 | ||
1660 | res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, | |
1661 | SD_MAX_RETRIES, &data, &sshdr); | |
1662 | ||
1663 | if (!scsi_status_is_good(res) || !data.header_length || | |
1664 | data.length < 6) { | |
1665 | sd_printk(KERN_WARNING, sdkp, | |
1666 | "getting Control mode page failed, assume no ATO\n"); | |
1667 | ||
1668 | if (scsi_sense_valid(&sshdr)) | |
1669 | sd_print_sense_hdr(sdkp, &sshdr); | |
1670 | ||
1671 | return; | |
1672 | } | |
1673 | ||
1674 | offset = data.header_length + data.block_descriptor_length; | |
1675 | ||
1676 | if ((buffer[offset] & 0x3f) != 0x0a) { | |
1677 | sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); | |
1678 | return; | |
1679 | } | |
1680 | ||
1681 | if ((buffer[offset + 5] & 0x80) == 0) | |
1682 | return; | |
1683 | ||
1684 | sdkp->ATO = 1; | |
1685 | ||
1686 | return; | |
1687 | } | |
1688 | ||
1da177e4 LT |
1689 | /** |
1690 | * sd_revalidate_disk - called the first time a new disk is seen, | |
1691 | * performs disk spin up, read_capacity, etc. | |
1692 | * @disk: struct gendisk we care about | |
1693 | **/ | |
1694 | static int sd_revalidate_disk(struct gendisk *disk) | |
1695 | { | |
1696 | struct scsi_disk *sdkp = scsi_disk(disk); | |
1697 | struct scsi_device *sdp = sdkp->device; | |
1da177e4 | 1698 | unsigned char *buffer; |
461d4e90 | 1699 | unsigned ordered; |
1da177e4 | 1700 | |
fa0d34be MP |
1701 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, |
1702 | "sd_revalidate_disk\n")); | |
1da177e4 LT |
1703 | |
1704 | /* | |
1705 | * If the device is offline, don't try and read capacity or any | |
1706 | * of the other niceties. | |
1707 | */ | |
1708 | if (!scsi_device_online(sdp)) | |
1709 | goto out; | |
1710 | ||
a6123f14 | 1711 | buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); |
1da177e4 | 1712 | if (!buffer) { |
e73aec82 MP |
1713 | sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " |
1714 | "allocation failure.\n"); | |
ea73a9f2 | 1715 | goto out; |
1da177e4 LT |
1716 | } |
1717 | ||
1718 | /* defaults, until the device tells us otherwise */ | |
1719 | sdp->sector_size = 512; | |
1720 | sdkp->capacity = 0; | |
1721 | sdkp->media_present = 1; | |
1722 | sdkp->write_prot = 0; | |
1723 | sdkp->WCE = 0; | |
1724 | sdkp->RCD = 0; | |
e0597d70 | 1725 | sdkp->ATO = 0; |
1da177e4 | 1726 | |
e73aec82 | 1727 | sd_spinup_disk(sdkp); |
1da177e4 LT |
1728 | |
1729 | /* | |
1730 | * Without media there is no reason to ask; moreover, some devices | |
1731 | * react badly if we do. | |
1732 | */ | |
1733 | if (sdkp->media_present) { | |
e73aec82 MP |
1734 | sd_read_capacity(sdkp, buffer); |
1735 | sd_read_write_protect_flag(sdkp, buffer); | |
1736 | sd_read_cache_type(sdkp, buffer); | |
e0597d70 | 1737 | sd_read_app_tag_own(sdkp, buffer); |
1da177e4 | 1738 | } |
461d4e90 TH |
1739 | |
1740 | /* | |
1741 | * We now have all cache related info, determine how we deal | |
1742 | * with ordered requests. Note that as the current SCSI | |
1743 | * dispatch function can alter request order, we cannot use | |
1744 | * QUEUE_ORDERED_TAG_* even when ordered tag is supported. | |
1745 | */ | |
1746 | if (sdkp->WCE) | |
007365ad TH |
1747 | ordered = sdkp->DPOFUA |
1748 | ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; | |
461d4e90 TH |
1749 | else |
1750 | ordered = QUEUE_ORDERED_DRAIN; | |
1751 | ||
1752 | blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); | |
1753 | ||
1da177e4 LT |
1754 | set_capacity(disk, sdkp->capacity); |
1755 | kfree(buffer); | |
1756 | ||
1da177e4 LT |
1757 | out: |
1758 | return 0; | |
1759 | } | |
1760 | ||
3e1a7ff8 TH |
1761 | /** |
1762 | * sd_format_disk_name - format disk name | |
1763 | * @prefix: name prefix - ie. "sd" for SCSI disks | |
1764 | * @index: index of the disk to format name for | |
1765 | * @buf: output buffer | |
1766 | * @buflen: length of the output buffer | |
1767 | * | |
1768 | * SCSI disk names starts at sda. The 26th device is sdz and the | |
1769 | * 27th is sdaa. The last one for two lettered suffix is sdzz | |
1770 | * which is followed by sdaaa. | |
1771 | * | |
1772 | * This is basically 26 base counting with one extra 'nil' entry | |
1773 | * at the beggining from the second digit on and can be | |
1774 | * determined using similar method as 26 base conversion with the | |
1775 | * index shifted -1 after each digit is computed. | |
1776 | * | |
1777 | * CONTEXT: | |
1778 | * Don't care. | |
1779 | * | |
1780 | * RETURNS: | |
1781 | * 0 on success, -errno on failure. | |
1782 | */ | |
1783 | static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) | |
1784 | { | |
1785 | const int base = 'z' - 'a' + 1; | |
1786 | char *begin = buf + strlen(prefix); | |
1787 | char *end = buf + buflen; | |
1788 | char *p; | |
1789 | int unit; | |
1790 | ||
1791 | p = end - 1; | |
1792 | *p = '\0'; | |
1793 | unit = base; | |
1794 | do { | |
1795 | if (p == begin) | |
1796 | return -EINVAL; | |
1797 | *--p = 'a' + (index % unit); | |
1798 | index = (index / unit) - 1; | |
1799 | } while (index >= 0); | |
1800 | ||
1801 | memmove(begin, p, end - p); | |
1802 | memcpy(buf, prefix, strlen(prefix)); | |
1803 | ||
1804 | return 0; | |
1805 | } | |
1806 | ||
4ace92fc AV |
1807 | /* |
1808 | * The asynchronous part of sd_probe | |
1809 | */ | |
1810 | static void sd_probe_async(void *data, async_cookie_t cookie) | |
1811 | { | |
1812 | struct scsi_disk *sdkp = data; | |
1813 | struct scsi_device *sdp; | |
1814 | struct gendisk *gd; | |
1815 | u32 index; | |
1816 | struct device *dev; | |
1817 | ||
1818 | sdp = sdkp->device; | |
1819 | gd = sdkp->disk; | |
1820 | index = sdkp->index; | |
1821 | dev = &sdp->sdev_gendev; | |
1822 | ||
1823 | if (!sdp->request_queue->rq_timeout) { | |
1824 | if (sdp->type != TYPE_MOD) | |
1825 | blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT); | |
1826 | else | |
1827 | blk_queue_rq_timeout(sdp->request_queue, | |
1828 | SD_MOD_TIMEOUT); | |
1829 | } | |
1830 | ||
1831 | device_initialize(&sdkp->dev); | |
1832 | sdkp->dev.parent = &sdp->sdev_gendev; | |
1833 | sdkp->dev.class = &sd_disk_class; | |
cd764695 | 1834 | dev_set_name(&sdkp->dev, dev_name(&sdp->sdev_gendev)); |
4ace92fc AV |
1835 | |
1836 | if (device_add(&sdkp->dev)) | |
1837 | goto out_free_index; | |
1838 | ||
1839 | get_device(&sdp->sdev_gendev); | |
1840 | ||
1841 | if (index < SD_MAX_DISKS) { | |
1842 | gd->major = sd_major((index & 0xf0) >> 4); | |
1843 | gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); | |
1844 | gd->minors = SD_MINORS; | |
1845 | } | |
1846 | gd->fops = &sd_fops; | |
1847 | gd->private_data = &sdkp->driver; | |
1848 | gd->queue = sdkp->device->request_queue; | |
1849 | ||
1850 | sd_revalidate_disk(gd); | |
1851 | ||
1852 | blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); | |
1853 | ||
1854 | gd->driverfs_dev = &sdp->sdev_gendev; | |
1855 | gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS; | |
1856 | if (sdp->removable) | |
1857 | gd->flags |= GENHD_FL_REMOVABLE; | |
1858 | ||
1859 | dev_set_drvdata(dev, sdkp); | |
1860 | add_disk(gd); | |
1861 | sd_dif_config_host(sdkp); | |
1862 | ||
1863 | sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", | |
1864 | sdp->removable ? "removable " : ""); | |
1865 | ||
1866 | return; | |
1867 | ||
1868 | out_free_index: | |
1869 | ida_remove(&sd_index_ida, index); | |
1870 | } | |
1871 | ||
1da177e4 LT |
1872 | /** |
1873 | * sd_probe - called during driver initialization and whenever a | |
1874 | * new scsi device is attached to the system. It is called once | |
1875 | * for each scsi device (not just disks) present. | |
1876 | * @dev: pointer to device object | |
1877 | * | |
1878 | * Returns 0 if successful (or not interested in this scsi device | |
1879 | * (e.g. scanner)); 1 when there is an error. | |
1880 | * | |
1881 | * Note: this function is invoked from the scsi mid-level. | |
1882 | * This function sets up the mapping between a given | |
1883 | * <host,channel,id,lun> (found in sdp) and new device name | |
1884 | * (e.g. /dev/sda). More precisely it is the block device major | |
1885 | * and minor number that is chosen here. | |
1886 | * | |
1887 | * Assume sd_attach is not re-entrant (for time being) | |
1888 | * Also think about sd_attach() and sd_remove() running coincidentally. | |
1889 | **/ | |
1890 | static int sd_probe(struct device *dev) | |
1891 | { | |
1892 | struct scsi_device *sdp = to_scsi_device(dev); | |
1893 | struct scsi_disk *sdkp; | |
1894 | struct gendisk *gd; | |
1895 | u32 index; | |
1896 | int error; | |
1897 | ||
1898 | error = -ENODEV; | |
631e8a13 | 1899 | if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) |
1da177e4 LT |
1900 | goto out; |
1901 | ||
9ccfc756 JB |
1902 | SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, |
1903 | "sd_attach\n")); | |
1da177e4 LT |
1904 | |
1905 | error = -ENOMEM; | |
24669f75 | 1906 | sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); |
1da177e4 LT |
1907 | if (!sdkp) |
1908 | goto out; | |
1909 | ||
689d6fac | 1910 | gd = alloc_disk(SD_MINORS); |
1da177e4 LT |
1911 | if (!gd) |
1912 | goto out_free; | |
1913 | ||
f27bac27 TH |
1914 | do { |
1915 | if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) | |
1916 | goto out_put; | |
1da177e4 | 1917 | |
4034cc68 | 1918 | spin_lock(&sd_index_lock); |
f27bac27 | 1919 | error = ida_get_new(&sd_index_ida, &index); |
4034cc68 | 1920 | spin_unlock(&sd_index_lock); |
f27bac27 | 1921 | } while (error == -EAGAIN); |
1da177e4 | 1922 | |
1da177e4 LT |
1923 | if (error) |
1924 | goto out_put; | |
1925 | ||
3e1a7ff8 TH |
1926 | error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN); |
1927 | if (error) | |
f27bac27 TH |
1928 | goto out_free_index; |
1929 | ||
1da177e4 LT |
1930 | sdkp->device = sdp; |
1931 | sdkp->driver = &sd_template; | |
1932 | sdkp->disk = gd; | |
1933 | sdkp->index = index; | |
1934 | sdkp->openers = 0; | |
c02e6002 | 1935 | sdkp->previous_state = 1; |
1da177e4 | 1936 | |
4ace92fc | 1937 | async_schedule(sd_probe_async, sdkp); |
1da177e4 LT |
1938 | |
1939 | return 0; | |
1940 | ||
f27bac27 | 1941 | out_free_index: |
4034cc68 | 1942 | spin_lock(&sd_index_lock); |
f27bac27 | 1943 | ida_remove(&sd_index_ida, index); |
4034cc68 | 1944 | spin_unlock(&sd_index_lock); |
6bdaa1f1 | 1945 | out_put: |
1da177e4 | 1946 | put_disk(gd); |
6bdaa1f1 | 1947 | out_free: |
1da177e4 | 1948 | kfree(sdkp); |
6bdaa1f1 | 1949 | out: |
1da177e4 LT |
1950 | return error; |
1951 | } | |
1952 | ||
1953 | /** | |
1954 | * sd_remove - called whenever a scsi disk (previously recognized by | |
1955 | * sd_probe) is detached from the system. It is called (potentially | |
1956 | * multiple times) during sd module unload. | |
1957 | * @sdp: pointer to mid level scsi device object | |
1958 | * | |
1959 | * Note: this function is invoked from the scsi mid-level. | |
1960 | * This function potentially frees up a device name (e.g. /dev/sdc) | |
1961 | * that could be re-used by a subsequent sd_probe(). | |
1962 | * This function is not called when the built-in sd driver is "exit-ed". | |
1963 | **/ | |
1964 | static int sd_remove(struct device *dev) | |
1965 | { | |
1966 | struct scsi_disk *sdkp = dev_get_drvdata(dev); | |
1967 | ||
ee959b00 | 1968 | device_del(&sdkp->dev); |
1da177e4 LT |
1969 | del_gendisk(sdkp->disk); |
1970 | sd_shutdown(dev); | |
39b7f1e2 | 1971 | |
0b950672 | 1972 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 1973 | dev_set_drvdata(dev, NULL); |
ee959b00 | 1974 | put_device(&sdkp->dev); |
0b950672 | 1975 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
1976 | |
1977 | return 0; | |
1978 | } | |
1979 | ||
1980 | /** | |
1981 | * scsi_disk_release - Called to free the scsi_disk structure | |
ee959b00 | 1982 | * @dev: pointer to embedded class device |
1da177e4 | 1983 | * |
0b950672 | 1984 | * sd_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
1985 | * called on last put, you should always use the scsi_disk_get() |
1986 | * scsi_disk_put() helpers which manipulate the semaphore directly | |
ee959b00 | 1987 | * and never do a direct put_device. |
1da177e4 | 1988 | **/ |
ee959b00 | 1989 | static void scsi_disk_release(struct device *dev) |
1da177e4 | 1990 | { |
ee959b00 | 1991 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
1da177e4 LT |
1992 | struct gendisk *disk = sdkp->disk; |
1993 | ||
4034cc68 | 1994 | spin_lock(&sd_index_lock); |
f27bac27 | 1995 | ida_remove(&sd_index_ida, sdkp->index); |
4034cc68 | 1996 | spin_unlock(&sd_index_lock); |
1da177e4 LT |
1997 | |
1998 | disk->private_data = NULL; | |
1da177e4 | 1999 | put_disk(disk); |
39b7f1e2 | 2000 | put_device(&sdkp->device->sdev_gendev); |
1da177e4 LT |
2001 | |
2002 | kfree(sdkp); | |
2003 | } | |
2004 | ||
cc5d2c8c | 2005 | static int sd_start_stop_device(struct scsi_disk *sdkp, int start) |
c3c94c5a TH |
2006 | { |
2007 | unsigned char cmd[6] = { START_STOP }; /* START_VALID */ | |
2008 | struct scsi_sense_hdr sshdr; | |
cc5d2c8c | 2009 | struct scsi_device *sdp = sdkp->device; |
c3c94c5a TH |
2010 | int res; |
2011 | ||
2012 | if (start) | |
2013 | cmd[4] |= 1; /* START */ | |
2014 | ||
d2886ea3 SR |
2015 | if (sdp->start_stop_pwr_cond) |
2016 | cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ | |
2017 | ||
c3c94c5a TH |
2018 | if (!scsi_device_online(sdp)) |
2019 | return -ENODEV; | |
2020 | ||
2021 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, | |
f4f4e47e | 2022 | SD_TIMEOUT, SD_MAX_RETRIES, NULL); |
c3c94c5a | 2023 | if (res) { |
cc5d2c8c JB |
2024 | sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); |
2025 | sd_print_result(sdkp, res); | |
c3c94c5a | 2026 | if (driver_byte(res) & DRIVER_SENSE) |
cc5d2c8c | 2027 | sd_print_sense_hdr(sdkp, &sshdr); |
c3c94c5a TH |
2028 | } |
2029 | ||
2030 | return res; | |
2031 | } | |
2032 | ||
1da177e4 LT |
2033 | /* |
2034 | * Send a SYNCHRONIZE CACHE instruction down to the device through | |
2035 | * the normal SCSI command structure. Wait for the command to | |
2036 | * complete. | |
2037 | */ | |
2038 | static void sd_shutdown(struct device *dev) | |
2039 | { | |
39b7f1e2 | 2040 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1da177e4 LT |
2041 | |
2042 | if (!sdkp) | |
2043 | return; /* this can happen */ | |
2044 | ||
39b7f1e2 | 2045 | if (sdkp->WCE) { |
e73aec82 MP |
2046 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
2047 | sd_sync_cache(sdkp); | |
39b7f1e2 | 2048 | } |
c3c94c5a | 2049 | |
cc5d2c8c JB |
2050 | if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { |
2051 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); | |
2052 | sd_start_stop_device(sdkp, 0); | |
c3c94c5a TH |
2053 | } |
2054 | ||
39b7f1e2 AS |
2055 | scsi_disk_put(sdkp); |
2056 | } | |
1da177e4 | 2057 | |
c3c94c5a TH |
2058 | static int sd_suspend(struct device *dev, pm_message_t mesg) |
2059 | { | |
c3c94c5a | 2060 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
09ff92fe | 2061 | int ret = 0; |
c3c94c5a TH |
2062 | |
2063 | if (!sdkp) | |
2064 | return 0; /* this can happen */ | |
2065 | ||
2066 | if (sdkp->WCE) { | |
cc5d2c8c | 2067 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
c3c94c5a TH |
2068 | ret = sd_sync_cache(sdkp); |
2069 | if (ret) | |
09ff92fe | 2070 | goto done; |
c3c94c5a TH |
2071 | } |
2072 | ||
3a2d5b70 | 2073 | if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { |
cc5d2c8c JB |
2074 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); |
2075 | ret = sd_start_stop_device(sdkp, 0); | |
c3c94c5a TH |
2076 | } |
2077 | ||
09ff92fe AS |
2078 | done: |
2079 | scsi_disk_put(sdkp); | |
2080 | return ret; | |
c3c94c5a TH |
2081 | } |
2082 | ||
2083 | static int sd_resume(struct device *dev) | |
2084 | { | |
c3c94c5a | 2085 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
09ff92fe | 2086 | int ret = 0; |
c3c94c5a | 2087 | |
cc5d2c8c | 2088 | if (!sdkp->device->manage_start_stop) |
09ff92fe | 2089 | goto done; |
c3c94c5a | 2090 | |
cc5d2c8c | 2091 | sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); |
09ff92fe | 2092 | ret = sd_start_stop_device(sdkp, 1); |
c3c94c5a | 2093 | |
09ff92fe AS |
2094 | done: |
2095 | scsi_disk_put(sdkp); | |
2096 | return ret; | |
c3c94c5a TH |
2097 | } |
2098 | ||
1da177e4 LT |
2099 | /** |
2100 | * init_sd - entry point for this driver (both when built in or when | |
2101 | * a module). | |
2102 | * | |
2103 | * Note: this function registers this driver with the scsi mid-level. | |
2104 | **/ | |
2105 | static int __init init_sd(void) | |
2106 | { | |
5e4009ba | 2107 | int majors = 0, i, err; |
1da177e4 LT |
2108 | |
2109 | SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); | |
2110 | ||
2111 | for (i = 0; i < SD_MAJORS; i++) | |
2112 | if (register_blkdev(sd_major(i), "sd") == 0) | |
2113 | majors++; | |
2114 | ||
2115 | if (!majors) | |
2116 | return -ENODEV; | |
2117 | ||
5e4009ba JG |
2118 | err = class_register(&sd_disk_class); |
2119 | if (err) | |
2120 | goto err_out; | |
6bdaa1f1 | 2121 | |
5e4009ba JG |
2122 | err = scsi_register_driver(&sd_template.gendrv); |
2123 | if (err) | |
2124 | goto err_out_class; | |
2125 | ||
2126 | return 0; | |
2127 | ||
2128 | err_out_class: | |
2129 | class_unregister(&sd_disk_class); | |
2130 | err_out: | |
2131 | for (i = 0; i < SD_MAJORS; i++) | |
2132 | unregister_blkdev(sd_major(i), "sd"); | |
2133 | return err; | |
1da177e4 LT |
2134 | } |
2135 | ||
2136 | /** | |
2137 | * exit_sd - exit point for this driver (when it is a module). | |
2138 | * | |
2139 | * Note: this function unregisters this driver from the scsi mid-level. | |
2140 | **/ | |
2141 | static void __exit exit_sd(void) | |
2142 | { | |
2143 | int i; | |
2144 | ||
2145 | SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); | |
2146 | ||
2147 | scsi_unregister_driver(&sd_template.gendrv); | |
5e4009ba JG |
2148 | class_unregister(&sd_disk_class); |
2149 | ||
1da177e4 LT |
2150 | for (i = 0; i < SD_MAJORS; i++) |
2151 | unregister_blkdev(sd_major(i), "sd"); | |
2152 | } | |
2153 | ||
1da177e4 LT |
2154 | module_init(init_sd); |
2155 | module_exit(exit_sd); | |
e73aec82 MP |
2156 | |
2157 | static void sd_print_sense_hdr(struct scsi_disk *sdkp, | |
2158 | struct scsi_sense_hdr *sshdr) | |
2159 | { | |
2160 | sd_printk(KERN_INFO, sdkp, ""); | |
2161 | scsi_show_sense_hdr(sshdr); | |
2162 | sd_printk(KERN_INFO, sdkp, ""); | |
2163 | scsi_show_extd_sense(sshdr->asc, sshdr->ascq); | |
2164 | } | |
2165 | ||
2166 | static void sd_print_result(struct scsi_disk *sdkp, int result) | |
2167 | { | |
2168 | sd_printk(KERN_INFO, sdkp, ""); | |
2169 | scsi_show_result(result); | |
2170 | } | |
2171 |