]>
Commit | Line | Data |
---|---|---|
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> |
1da177e4 LT |
50 | #include <asm/uaccess.h> |
51 | ||
52 | #include <scsi/scsi.h> | |
53 | #include <scsi/scsi_cmnd.h> | |
54 | #include <scsi/scsi_dbg.h> | |
55 | #include <scsi/scsi_device.h> | |
56 | #include <scsi/scsi_driver.h> | |
57 | #include <scsi/scsi_eh.h> | |
58 | #include <scsi/scsi_host.h> | |
59 | #include <scsi/scsi_ioctl.h> | |
1da177e4 LT |
60 | #include <scsi/scsicam.h> |
61 | ||
aa91696e | 62 | #include "sd.h" |
1da177e4 LT |
63 | #include "scsi_logging.h" |
64 | ||
f018fa55 RH |
65 | MODULE_AUTHOR("Eric Youngdale"); |
66 | MODULE_DESCRIPTION("SCSI disk (sd) driver"); | |
67 | MODULE_LICENSE("GPL"); | |
68 | ||
69 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK0_MAJOR); | |
70 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK1_MAJOR); | |
71 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK2_MAJOR); | |
72 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK3_MAJOR); | |
73 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK4_MAJOR); | |
74 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK5_MAJOR); | |
75 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK6_MAJOR); | |
76 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK7_MAJOR); | |
77 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK8_MAJOR); | |
78 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK9_MAJOR); | |
79 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK10_MAJOR); | |
80 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK11_MAJOR); | |
81 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK12_MAJOR); | |
82 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK13_MAJOR); | |
83 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK14_MAJOR); | |
84 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_DISK15_MAJOR); | |
d7b8bcb0 MT |
85 | MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK); |
86 | MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD); | |
87 | MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC); | |
f018fa55 | 88 | |
f615b48c TH |
89 | #define SD_PARTS 64 |
90 | #define SD_MINORS 16 | |
91 | #define SD_EXT_MINORS (SD_PARTS - SD_MINORS) | |
92 | ||
7b3d9545 LT |
93 | static int sd_revalidate_disk(struct gendisk *); |
94 | static int sd_probe(struct device *); | |
95 | static int sd_remove(struct device *); | |
96 | static void sd_shutdown(struct device *); | |
97 | static int sd_suspend(struct device *, pm_message_t state); | |
98 | static int sd_resume(struct device *); | |
99 | static void sd_rescan(struct device *); | |
100 | static int sd_done(struct scsi_cmnd *); | |
101 | static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer); | |
ee959b00 | 102 | static void scsi_disk_release(struct device *cdev); |
7b3d9545 LT |
103 | static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *); |
104 | static void sd_print_result(struct scsi_disk *, int); | |
105 | ||
f27bac27 | 106 | static DEFINE_IDA(sd_index_ida); |
1da177e4 LT |
107 | |
108 | /* This semaphore is used to mediate the 0->1 reference get in the | |
109 | * face of object destruction (i.e. we can't allow a get on an | |
110 | * object after last put) */ | |
0b950672 | 111 | static DEFINE_MUTEX(sd_ref_mutex); |
1da177e4 | 112 | |
6bdaa1f1 JB |
113 | static const char *sd_cache_types[] = { |
114 | "write through", "none", "write back", | |
115 | "write back, no read (daft)" | |
116 | }; | |
117 | ||
ee959b00 TJ |
118 | static ssize_t |
119 | sd_store_cache_type(struct device *dev, struct device_attribute *attr, | |
120 | const char *buf, size_t count) | |
6bdaa1f1 JB |
121 | { |
122 | int i, ct = -1, rcd, wce, sp; | |
ee959b00 | 123 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
124 | struct scsi_device *sdp = sdkp->device; |
125 | char buffer[64]; | |
126 | char *buffer_data; | |
127 | struct scsi_mode_data data; | |
128 | struct scsi_sense_hdr sshdr; | |
129 | int len; | |
130 | ||
131 | if (sdp->type != TYPE_DISK) | |
132 | /* no cache control on RBC devices; theoretically they | |
133 | * can do it, but there's probably so many exceptions | |
134 | * it's not worth the risk */ | |
135 | return -EINVAL; | |
136 | ||
6391a113 | 137 | for (i = 0; i < ARRAY_SIZE(sd_cache_types); i++) { |
6bdaa1f1 JB |
138 | const int len = strlen(sd_cache_types[i]); |
139 | if (strncmp(sd_cache_types[i], buf, len) == 0 && | |
140 | buf[len] == '\n') { | |
141 | ct = i; | |
142 | break; | |
143 | } | |
144 | } | |
145 | if (ct < 0) | |
146 | return -EINVAL; | |
147 | rcd = ct & 0x01 ? 1 : 0; | |
148 | wce = ct & 0x02 ? 1 : 0; | |
149 | if (scsi_mode_sense(sdp, 0x08, 8, buffer, sizeof(buffer), SD_TIMEOUT, | |
150 | SD_MAX_RETRIES, &data, NULL)) | |
151 | return -EINVAL; | |
a9312fb8 | 152 | len = min_t(size_t, sizeof(buffer), data.length - data.header_length - |
6bdaa1f1 JB |
153 | data.block_descriptor_length); |
154 | buffer_data = buffer + data.header_length + | |
155 | data.block_descriptor_length; | |
156 | buffer_data[2] &= ~0x05; | |
157 | buffer_data[2] |= wce << 2 | rcd; | |
158 | sp = buffer_data[0] & 0x80 ? 1 : 0; | |
159 | ||
160 | if (scsi_mode_select(sdp, 1, sp, 8, buffer_data, len, SD_TIMEOUT, | |
161 | SD_MAX_RETRIES, &data, &sshdr)) { | |
162 | if (scsi_sense_valid(&sshdr)) | |
e73aec82 | 163 | sd_print_sense_hdr(sdkp, &sshdr); |
6bdaa1f1 JB |
164 | return -EINVAL; |
165 | } | |
166 | sd_revalidate_disk(sdkp->disk); | |
167 | return count; | |
168 | } | |
169 | ||
ee959b00 TJ |
170 | static ssize_t |
171 | sd_store_manage_start_stop(struct device *dev, struct device_attribute *attr, | |
172 | const char *buf, size_t count) | |
c3c94c5a | 173 | { |
ee959b00 | 174 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
c3c94c5a TH |
175 | struct scsi_device *sdp = sdkp->device; |
176 | ||
177 | if (!capable(CAP_SYS_ADMIN)) | |
178 | return -EACCES; | |
179 | ||
180 | sdp->manage_start_stop = simple_strtoul(buf, NULL, 10); | |
181 | ||
182 | return count; | |
183 | } | |
184 | ||
ee959b00 TJ |
185 | static ssize_t |
186 | sd_store_allow_restart(struct device *dev, struct device_attribute *attr, | |
187 | const char *buf, size_t count) | |
a144c5ae | 188 | { |
ee959b00 | 189 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
a144c5ae BK |
190 | struct scsi_device *sdp = sdkp->device; |
191 | ||
192 | if (!capable(CAP_SYS_ADMIN)) | |
193 | return -EACCES; | |
194 | ||
195 | if (sdp->type != TYPE_DISK) | |
196 | return -EINVAL; | |
197 | ||
198 | sdp->allow_restart = simple_strtoul(buf, NULL, 10); | |
199 | ||
200 | return count; | |
201 | } | |
202 | ||
ee959b00 TJ |
203 | static ssize_t |
204 | sd_show_cache_type(struct device *dev, struct device_attribute *attr, | |
205 | char *buf) | |
6bdaa1f1 | 206 | { |
ee959b00 | 207 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
208 | int ct = sdkp->RCD + 2*sdkp->WCE; |
209 | ||
210 | return snprintf(buf, 40, "%s\n", sd_cache_types[ct]); | |
211 | } | |
212 | ||
ee959b00 TJ |
213 | static ssize_t |
214 | sd_show_fua(struct device *dev, struct device_attribute *attr, char *buf) | |
6bdaa1f1 | 215 | { |
ee959b00 | 216 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
6bdaa1f1 JB |
217 | |
218 | return snprintf(buf, 20, "%u\n", sdkp->DPOFUA); | |
219 | } | |
220 | ||
ee959b00 TJ |
221 | static ssize_t |
222 | sd_show_manage_start_stop(struct device *dev, struct device_attribute *attr, | |
223 | char *buf) | |
c3c94c5a | 224 | { |
ee959b00 | 225 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
c3c94c5a TH |
226 | struct scsi_device *sdp = sdkp->device; |
227 | ||
228 | return snprintf(buf, 20, "%u\n", sdp->manage_start_stop); | |
229 | } | |
230 | ||
ee959b00 TJ |
231 | static ssize_t |
232 | sd_show_allow_restart(struct device *dev, struct device_attribute *attr, | |
233 | char *buf) | |
a144c5ae | 234 | { |
ee959b00 | 235 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
a144c5ae BK |
236 | |
237 | return snprintf(buf, 40, "%d\n", sdkp->device->allow_restart); | |
238 | } | |
239 | ||
e0597d70 MP |
240 | static ssize_t |
241 | sd_show_protection_type(struct device *dev, struct device_attribute *attr, | |
242 | char *buf) | |
243 | { | |
244 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
245 | ||
246 | return snprintf(buf, 20, "%u\n", sdkp->protection_type); | |
247 | } | |
248 | ||
249 | static ssize_t | |
250 | sd_show_app_tag_own(struct device *dev, struct device_attribute *attr, | |
251 | char *buf) | |
252 | { | |
253 | struct scsi_disk *sdkp = to_scsi_disk(dev); | |
254 | ||
255 | return snprintf(buf, 20, "%u\n", sdkp->ATO); | |
256 | } | |
257 | ||
ee959b00 | 258 | static struct device_attribute sd_disk_attrs[] = { |
6bdaa1f1 JB |
259 | __ATTR(cache_type, S_IRUGO|S_IWUSR, sd_show_cache_type, |
260 | sd_store_cache_type), | |
261 | __ATTR(FUA, S_IRUGO, sd_show_fua, NULL), | |
a144c5ae BK |
262 | __ATTR(allow_restart, S_IRUGO|S_IWUSR, sd_show_allow_restart, |
263 | sd_store_allow_restart), | |
c3c94c5a TH |
264 | __ATTR(manage_start_stop, S_IRUGO|S_IWUSR, sd_show_manage_start_stop, |
265 | sd_store_manage_start_stop), | |
e0597d70 MP |
266 | __ATTR(protection_type, S_IRUGO, sd_show_protection_type, NULL), |
267 | __ATTR(app_tag_own, S_IRUGO, sd_show_app_tag_own, NULL), | |
6bdaa1f1 JB |
268 | __ATTR_NULL, |
269 | }; | |
270 | ||
271 | static struct class sd_disk_class = { | |
272 | .name = "scsi_disk", | |
273 | .owner = THIS_MODULE, | |
ee959b00 TJ |
274 | .dev_release = scsi_disk_release, |
275 | .dev_attrs = sd_disk_attrs, | |
6bdaa1f1 | 276 | }; |
1da177e4 LT |
277 | |
278 | static struct scsi_driver sd_template = { | |
279 | .owner = THIS_MODULE, | |
280 | .gendrv = { | |
281 | .name = "sd", | |
282 | .probe = sd_probe, | |
283 | .remove = sd_remove, | |
c3c94c5a TH |
284 | .suspend = sd_suspend, |
285 | .resume = sd_resume, | |
1da177e4 LT |
286 | .shutdown = sd_shutdown, |
287 | }, | |
288 | .rescan = sd_rescan, | |
7b3d9545 | 289 | .done = sd_done, |
1da177e4 LT |
290 | }; |
291 | ||
292 | /* | |
293 | * Device no to disk mapping: | |
294 | * | |
295 | * major disc2 disc p1 | |
296 | * |............|.............|....|....| <- dev_t | |
297 | * 31 20 19 8 7 4 3 0 | |
298 | * | |
299 | * Inside a major, we have 16k disks, however mapped non- | |
300 | * contiguously. The first 16 disks are for major0, the next | |
301 | * ones with major1, ... Disk 256 is for major0 again, disk 272 | |
302 | * for major1, ... | |
303 | * As we stay compatible with our numbering scheme, we can reuse | |
304 | * the well-know SCSI majors 8, 65--71, 136--143. | |
305 | */ | |
306 | static int sd_major(int major_idx) | |
307 | { | |
308 | switch (major_idx) { | |
309 | case 0: | |
310 | return SCSI_DISK0_MAJOR; | |
311 | case 1 ... 7: | |
312 | return SCSI_DISK1_MAJOR + major_idx - 1; | |
313 | case 8 ... 15: | |
314 | return SCSI_DISK8_MAJOR + major_idx - 8; | |
315 | default: | |
316 | BUG(); | |
317 | return 0; /* shut up gcc */ | |
318 | } | |
319 | } | |
320 | ||
39b7f1e2 | 321 | static struct scsi_disk *__scsi_disk_get(struct gendisk *disk) |
1da177e4 LT |
322 | { |
323 | struct scsi_disk *sdkp = NULL; | |
324 | ||
39b7f1e2 AS |
325 | if (disk->private_data) { |
326 | sdkp = scsi_disk(disk); | |
327 | if (scsi_device_get(sdkp->device) == 0) | |
ee959b00 | 328 | get_device(&sdkp->dev); |
39b7f1e2 AS |
329 | else |
330 | sdkp = NULL; | |
331 | } | |
332 | return sdkp; | |
333 | } | |
334 | ||
335 | static struct scsi_disk *scsi_disk_get(struct gendisk *disk) | |
336 | { | |
337 | struct scsi_disk *sdkp; | |
338 | ||
0b950672 | 339 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 340 | sdkp = __scsi_disk_get(disk); |
0b950672 | 341 | mutex_unlock(&sd_ref_mutex); |
1da177e4 | 342 | return sdkp; |
39b7f1e2 | 343 | } |
1da177e4 | 344 | |
39b7f1e2 AS |
345 | static struct scsi_disk *scsi_disk_get_from_dev(struct device *dev) |
346 | { | |
347 | struct scsi_disk *sdkp; | |
348 | ||
0b950672 | 349 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 AS |
350 | sdkp = dev_get_drvdata(dev); |
351 | if (sdkp) | |
352 | sdkp = __scsi_disk_get(sdkp->disk); | |
0b950672 | 353 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
354 | return sdkp; |
355 | } | |
356 | ||
357 | static void scsi_disk_put(struct scsi_disk *sdkp) | |
358 | { | |
359 | struct scsi_device *sdev = sdkp->device; | |
360 | ||
0b950672 | 361 | mutex_lock(&sd_ref_mutex); |
ee959b00 | 362 | put_device(&sdkp->dev); |
1da177e4 | 363 | scsi_device_put(sdev); |
0b950672 | 364 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
365 | } |
366 | ||
367 | /** | |
368 | * sd_init_command - build a scsi (read or write) command from | |
369 | * information in the request structure. | |
370 | * @SCpnt: pointer to mid-level's per scsi command structure that | |
371 | * contains request and into which the scsi command is written | |
372 | * | |
373 | * Returns 1 if successful and 0 if error (or cannot be done now). | |
374 | **/ | |
7f9a6bc4 | 375 | static int sd_prep_fn(struct request_queue *q, struct request *rq) |
1da177e4 | 376 | { |
7f9a6bc4 JB |
377 | struct scsi_cmnd *SCpnt; |
378 | struct scsi_device *sdp = q->queuedata; | |
776b23a0 | 379 | struct gendisk *disk = rq->rq_disk; |
af55ff67 | 380 | struct scsi_disk *sdkp; |
776b23a0 | 381 | sector_t block = rq->sector; |
18351070 | 382 | sector_t threshold; |
7f9a6bc4 | 383 | unsigned int this_count = rq->nr_sectors; |
776b23a0 | 384 | unsigned int timeout = sdp->timeout; |
7f9a6bc4 JB |
385 | int ret; |
386 | ||
387 | if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { | |
388 | ret = scsi_setup_blk_pc_cmnd(sdp, rq); | |
389 | goto out; | |
390 | } else if (rq->cmd_type != REQ_TYPE_FS) { | |
391 | ret = BLKPREP_KILL; | |
392 | goto out; | |
393 | } | |
394 | ret = scsi_setup_fs_cmnd(sdp, rq); | |
395 | if (ret != BLKPREP_OK) | |
396 | goto out; | |
397 | SCpnt = rq->special; | |
af55ff67 | 398 | sdkp = scsi_disk(disk); |
7f9a6bc4 JB |
399 | |
400 | /* from here on until we're complete, any goto out | |
401 | * is used for a killable error condition */ | |
402 | ret = BLKPREP_KILL; | |
1da177e4 | 403 | |
fa0d34be MP |
404 | SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt, |
405 | "sd_init_command: block=%llu, " | |
406 | "count=%d\n", | |
407 | (unsigned long long)block, | |
408 | this_count)); | |
1da177e4 LT |
409 | |
410 | if (!sdp || !scsi_device_online(sdp) || | |
411 | block + rq->nr_sectors > get_capacity(disk)) { | |
fa0d34be MP |
412 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
413 | "Finishing %ld sectors\n", | |
414 | rq->nr_sectors)); | |
415 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, | |
416 | "Retry with 0x%p\n", SCpnt)); | |
7f9a6bc4 | 417 | goto out; |
1da177e4 LT |
418 | } |
419 | ||
420 | if (sdp->changed) { | |
421 | /* | |
422 | * quietly refuse to do anything to a changed disc until | |
423 | * the changed bit has been reset | |
424 | */ | |
425 | /* printk("SCSI disk has been changed. Prohibiting further I/O.\n"); */ | |
7f9a6bc4 | 426 | goto out; |
1da177e4 | 427 | } |
7f9a6bc4 | 428 | |
a0899d4d | 429 | /* |
18351070 LT |
430 | * Some SD card readers can't handle multi-sector accesses which touch |
431 | * the last one or two hardware sectors. Split accesses as needed. | |
a0899d4d | 432 | */ |
18351070 LT |
433 | threshold = get_capacity(disk) - SD_LAST_BUGGY_SECTORS * |
434 | (sdp->sector_size / 512); | |
435 | ||
436 | if (unlikely(sdp->last_sector_bug && block + this_count > threshold)) { | |
437 | if (block < threshold) { | |
438 | /* Access up to the threshold but not beyond */ | |
439 | this_count = threshold - block; | |
440 | } else { | |
441 | /* Access only a single hardware sector */ | |
442 | this_count = sdp->sector_size / 512; | |
443 | } | |
444 | } | |
a0899d4d | 445 | |
fa0d34be MP |
446 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, "block=%llu\n", |
447 | (unsigned long long)block)); | |
1da177e4 LT |
448 | |
449 | /* | |
450 | * If we have a 1K hardware sectorsize, prevent access to single | |
451 | * 512 byte sectors. In theory we could handle this - in fact | |
452 | * the scsi cdrom driver must be able to handle this because | |
453 | * we typically use 1K blocksizes, and cdroms typically have | |
454 | * 2K hardware sectorsizes. Of course, things are simpler | |
455 | * with the cdrom, since it is read-only. For performance | |
456 | * reasons, the filesystems should be able to handle this | |
457 | * and not force the scsi disk driver to use bounce buffers | |
458 | * for this. | |
459 | */ | |
460 | if (sdp->sector_size == 1024) { | |
461 | if ((block & 1) || (rq->nr_sectors & 1)) { | |
e73aec82 MP |
462 | scmd_printk(KERN_ERR, SCpnt, |
463 | "Bad block number requested\n"); | |
7f9a6bc4 | 464 | goto out; |
1da177e4 LT |
465 | } else { |
466 | block = block >> 1; | |
467 | this_count = this_count >> 1; | |
468 | } | |
469 | } | |
470 | if (sdp->sector_size == 2048) { | |
471 | if ((block & 3) || (rq->nr_sectors & 3)) { | |
e73aec82 MP |
472 | scmd_printk(KERN_ERR, SCpnt, |
473 | "Bad block number requested\n"); | |
7f9a6bc4 | 474 | goto out; |
1da177e4 LT |
475 | } else { |
476 | block = block >> 2; | |
477 | this_count = this_count >> 2; | |
478 | } | |
479 | } | |
480 | if (sdp->sector_size == 4096) { | |
481 | if ((block & 7) || (rq->nr_sectors & 7)) { | |
e73aec82 MP |
482 | scmd_printk(KERN_ERR, SCpnt, |
483 | "Bad block number requested\n"); | |
7f9a6bc4 | 484 | goto out; |
1da177e4 LT |
485 | } else { |
486 | block = block >> 3; | |
487 | this_count = this_count >> 3; | |
488 | } | |
489 | } | |
490 | if (rq_data_dir(rq) == WRITE) { | |
491 | if (!sdp->writeable) { | |
7f9a6bc4 | 492 | goto out; |
1da177e4 LT |
493 | } |
494 | SCpnt->cmnd[0] = WRITE_6; | |
495 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
af55ff67 MP |
496 | |
497 | if (blk_integrity_rq(rq) && | |
498 | sd_dif_prepare(rq, block, sdp->sector_size) == -EIO) | |
499 | goto out; | |
500 | ||
1da177e4 LT |
501 | } else if (rq_data_dir(rq) == READ) { |
502 | SCpnt->cmnd[0] = READ_6; | |
503 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
504 | } else { | |
e73aec82 | 505 | scmd_printk(KERN_ERR, SCpnt, "Unknown command %x\n", rq->cmd_flags); |
7f9a6bc4 | 506 | goto out; |
1da177e4 LT |
507 | } |
508 | ||
fa0d34be MP |
509 | SCSI_LOG_HLQUEUE(2, scmd_printk(KERN_INFO, SCpnt, |
510 | "%s %d/%ld 512 byte blocks.\n", | |
511 | (rq_data_dir(rq) == WRITE) ? | |
512 | "writing" : "reading", this_count, | |
513 | rq->nr_sectors)); | |
1da177e4 | 514 | |
af55ff67 MP |
515 | /* Set RDPROTECT/WRPROTECT if disk is formatted with DIF */ |
516 | if (scsi_host_dif_capable(sdp->host, sdkp->protection_type)) | |
517 | SCpnt->cmnd[1] = 1 << 5; | |
518 | else | |
519 | SCpnt->cmnd[1] = 0; | |
520 | ||
1da177e4 LT |
521 | if (block > 0xffffffff) { |
522 | SCpnt->cmnd[0] += READ_16 - READ_6; | |
007365ad | 523 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
524 | SCpnt->cmnd[2] = sizeof(block) > 4 ? (unsigned char) (block >> 56) & 0xff : 0; |
525 | SCpnt->cmnd[3] = sizeof(block) > 4 ? (unsigned char) (block >> 48) & 0xff : 0; | |
526 | SCpnt->cmnd[4] = sizeof(block) > 4 ? (unsigned char) (block >> 40) & 0xff : 0; | |
527 | SCpnt->cmnd[5] = sizeof(block) > 4 ? (unsigned char) (block >> 32) & 0xff : 0; | |
528 | SCpnt->cmnd[6] = (unsigned char) (block >> 24) & 0xff; | |
529 | SCpnt->cmnd[7] = (unsigned char) (block >> 16) & 0xff; | |
530 | SCpnt->cmnd[8] = (unsigned char) (block >> 8) & 0xff; | |
531 | SCpnt->cmnd[9] = (unsigned char) block & 0xff; | |
532 | SCpnt->cmnd[10] = (unsigned char) (this_count >> 24) & 0xff; | |
533 | SCpnt->cmnd[11] = (unsigned char) (this_count >> 16) & 0xff; | |
534 | SCpnt->cmnd[12] = (unsigned char) (this_count >> 8) & 0xff; | |
535 | SCpnt->cmnd[13] = (unsigned char) this_count & 0xff; | |
536 | SCpnt->cmnd[14] = SCpnt->cmnd[15] = 0; | |
537 | } else if ((this_count > 0xff) || (block > 0x1fffff) || | |
af55ff67 | 538 | scsi_device_protection(SCpnt->device) || |
1da177e4 LT |
539 | SCpnt->device->use_10_for_rw) { |
540 | if (this_count > 0xffff) | |
541 | this_count = 0xffff; | |
542 | ||
543 | SCpnt->cmnd[0] += READ_10 - READ_6; | |
007365ad | 544 | SCpnt->cmnd[1] |= blk_fua_rq(rq) ? 0x8 : 0; |
1da177e4 LT |
545 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; |
546 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
547 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
548 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
549 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
550 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
551 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
552 | } else { | |
007365ad TH |
553 | if (unlikely(blk_fua_rq(rq))) { |
554 | /* | |
555 | * This happens only if this drive failed | |
556 | * 10byte rw command with ILLEGAL_REQUEST | |
557 | * during operation and thus turned off | |
558 | * use_10_for_rw. | |
559 | */ | |
e73aec82 MP |
560 | scmd_printk(KERN_ERR, SCpnt, |
561 | "FUA write on READ/WRITE(6) drive\n"); | |
7f9a6bc4 | 562 | goto out; |
007365ad TH |
563 | } |
564 | ||
1da177e4 LT |
565 | SCpnt->cmnd[1] |= (unsigned char) ((block >> 16) & 0x1f); |
566 | SCpnt->cmnd[2] = (unsigned char) ((block >> 8) & 0xff); | |
567 | SCpnt->cmnd[3] = (unsigned char) block & 0xff; | |
568 | SCpnt->cmnd[4] = (unsigned char) this_count; | |
569 | SCpnt->cmnd[5] = 0; | |
570 | } | |
30b0c37b | 571 | SCpnt->sdb.length = this_count * sdp->sector_size; |
1da177e4 | 572 | |
af55ff67 MP |
573 | /* If DIF or DIX is enabled, tell HBA how to handle request */ |
574 | if (sdkp->protection_type || scsi_prot_sg_count(SCpnt)) | |
575 | sd_dif_op(SCpnt, sdkp->protection_type, scsi_prot_sg_count(SCpnt)); | |
576 | ||
1da177e4 LT |
577 | /* |
578 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
579 | * host adapter, it's safe to assume that we can at least transfer | |
580 | * this many bytes between each connect / disconnect. | |
581 | */ | |
582 | SCpnt->transfersize = sdp->sector_size; | |
583 | SCpnt->underflow = this_count << 9; | |
584 | SCpnt->allowed = SD_MAX_RETRIES; | |
1da177e4 LT |
585 | SCpnt->timeout_per_command = timeout; |
586 | ||
1da177e4 LT |
587 | /* |
588 | * This indicates that the command is ready from our end to be | |
589 | * queued. | |
590 | */ | |
7f9a6bc4 JB |
591 | ret = BLKPREP_OK; |
592 | out: | |
593 | return scsi_prep_return(q, rq, ret); | |
1da177e4 LT |
594 | } |
595 | ||
596 | /** | |
597 | * sd_open - open a scsi disk device | |
598 | * @inode: only i_rdev member may be used | |
599 | * @filp: only f_mode and f_flags may be used | |
600 | * | |
601 | * Returns 0 if successful. Returns a negated errno value in case | |
602 | * of error. | |
603 | * | |
604 | * Note: This can be called from a user context (e.g. fsck(1) ) | |
605 | * or from within the kernel (e.g. as a result of a mount(1) ). | |
606 | * In the latter case @inode and @filp carry an abridged amount | |
607 | * of information as noted above. | |
608 | **/ | |
609 | static int sd_open(struct inode *inode, struct file *filp) | |
610 | { | |
611 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
612 | struct scsi_disk *sdkp; | |
613 | struct scsi_device *sdev; | |
614 | int retval; | |
615 | ||
616 | if (!(sdkp = scsi_disk_get(disk))) | |
617 | return -ENXIO; | |
618 | ||
619 | ||
fa0d34be | 620 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_open\n")); |
1da177e4 LT |
621 | |
622 | sdev = sdkp->device; | |
623 | ||
624 | /* | |
625 | * If the device is in error recovery, wait until it is done. | |
626 | * If the device is offline, then disallow any access to it. | |
627 | */ | |
628 | retval = -ENXIO; | |
629 | if (!scsi_block_when_processing_errors(sdev)) | |
630 | goto error_out; | |
631 | ||
632 | if (sdev->removable || sdkp->write_prot) | |
633 | check_disk_change(inode->i_bdev); | |
634 | ||
635 | /* | |
636 | * If the drive is empty, just let the open fail. | |
637 | */ | |
638 | retval = -ENOMEDIUM; | |
639 | if (sdev->removable && !sdkp->media_present && | |
640 | !(filp->f_flags & O_NDELAY)) | |
641 | goto error_out; | |
642 | ||
643 | /* | |
644 | * If the device has the write protect tab set, have the open fail | |
645 | * if the user expects to be able to write to the thing. | |
646 | */ | |
647 | retval = -EROFS; | |
648 | if (sdkp->write_prot && (filp->f_mode & FMODE_WRITE)) | |
649 | goto error_out; | |
650 | ||
651 | /* | |
652 | * It is possible that the disk changing stuff resulted in | |
653 | * the device being taken offline. If this is the case, | |
654 | * report this to the user, and don't pretend that the | |
655 | * open actually succeeded. | |
656 | */ | |
657 | retval = -ENXIO; | |
658 | if (!scsi_device_online(sdev)) | |
659 | goto error_out; | |
660 | ||
661 | if (!sdkp->openers++ && sdev->removable) { | |
662 | if (scsi_block_when_processing_errors(sdev)) | |
663 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_PREVENT); | |
664 | } | |
665 | ||
666 | return 0; | |
667 | ||
668 | error_out: | |
669 | scsi_disk_put(sdkp); | |
670 | return retval; | |
671 | } | |
672 | ||
673 | /** | |
674 | * sd_release - invoked when the (last) close(2) is called on this | |
675 | * scsi disk. | |
676 | * @inode: only i_rdev member may be used | |
677 | * @filp: only f_mode and f_flags may be used | |
678 | * | |
679 | * Returns 0. | |
680 | * | |
681 | * Note: may block (uninterruptible) if error recovery is underway | |
682 | * on this disk. | |
683 | **/ | |
684 | static int sd_release(struct inode *inode, struct file *filp) | |
685 | { | |
686 | struct gendisk *disk = inode->i_bdev->bd_disk; | |
687 | struct scsi_disk *sdkp = scsi_disk(disk); | |
688 | struct scsi_device *sdev = sdkp->device; | |
689 | ||
56937f7b | 690 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_release\n")); |
1da177e4 LT |
691 | |
692 | if (!--sdkp->openers && sdev->removable) { | |
693 | if (scsi_block_when_processing_errors(sdev)) | |
694 | scsi_set_medium_removal(sdev, SCSI_REMOVAL_ALLOW); | |
695 | } | |
696 | ||
697 | /* | |
698 | * XXX and what if there are packets in flight and this close() | |
699 | * XXX is followed by a "rmmod sd_mod"? | |
700 | */ | |
701 | scsi_disk_put(sdkp); | |
702 | return 0; | |
703 | } | |
704 | ||
a885c8c4 | 705 | static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
1da177e4 LT |
706 | { |
707 | struct scsi_disk *sdkp = scsi_disk(bdev->bd_disk); | |
708 | struct scsi_device *sdp = sdkp->device; | |
709 | struct Scsi_Host *host = sdp->host; | |
710 | int diskinfo[4]; | |
711 | ||
712 | /* default to most commonly used values */ | |
713 | diskinfo[0] = 0x40; /* 1 << 6 */ | |
714 | diskinfo[1] = 0x20; /* 1 << 5 */ | |
715 | diskinfo[2] = sdkp->capacity >> 11; | |
716 | ||
717 | /* override with calculated, extended default, or driver values */ | |
718 | if (host->hostt->bios_param) | |
719 | host->hostt->bios_param(sdp, bdev, sdkp->capacity, diskinfo); | |
720 | else | |
721 | scsicam_bios_param(bdev, sdkp->capacity, diskinfo); | |
722 | ||
a885c8c4 CH |
723 | geo->heads = diskinfo[0]; |
724 | geo->sectors = diskinfo[1]; | |
725 | geo->cylinders = diskinfo[2]; | |
1da177e4 LT |
726 | return 0; |
727 | } | |
728 | ||
729 | /** | |
730 | * sd_ioctl - process an ioctl | |
731 | * @inode: only i_rdev/i_bdev members may be used | |
732 | * @filp: only f_mode and f_flags may be used | |
733 | * @cmd: ioctl command number | |
734 | * @arg: this is third argument given to ioctl(2) system call. | |
735 | * Often contains a pointer. | |
736 | * | |
737 | * Returns 0 if successful (some ioctls return postive numbers on | |
738 | * success as well). Returns a negated errno value in case of error. | |
739 | * | |
740 | * Note: most ioctls are forward onto the block subsystem or further | |
3a4fa0a2 | 741 | * down in the scsi subsystem. |
1da177e4 LT |
742 | **/ |
743 | static int sd_ioctl(struct inode * inode, struct file * filp, | |
744 | unsigned int cmd, unsigned long arg) | |
745 | { | |
746 | struct block_device *bdev = inode->i_bdev; | |
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, filp); | |
762 | if (!scsi_block_when_processing_errors(sdp) || !error) | |
763 | return error; | |
764 | ||
1da177e4 LT |
765 | /* |
766 | * Send SCSI addressing ioctls directly to mid level, send other | |
767 | * ioctls to block level and then onto mid level if they can't be | |
768 | * resolved. | |
769 | */ | |
770 | switch (cmd) { | |
771 | case SCSI_IOCTL_GET_IDLUN: | |
772 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
773 | return scsi_ioctl(sdp, cmd, p); | |
774 | default: | |
45e79a3a | 775 | error = scsi_cmd_ioctl(filp, disk->queue, disk, cmd, p); |
1da177e4 LT |
776 | if (error != -ENOTTY) |
777 | return error; | |
778 | } | |
779 | return scsi_ioctl(sdp, cmd, p); | |
780 | } | |
781 | ||
782 | static void set_media_not_present(struct scsi_disk *sdkp) | |
783 | { | |
784 | sdkp->media_present = 0; | |
785 | sdkp->capacity = 0; | |
786 | sdkp->device->changed = 1; | |
787 | } | |
788 | ||
789 | /** | |
790 | * sd_media_changed - check if our medium changed | |
791 | * @disk: kernel device descriptor | |
792 | * | |
793 | * Returns 0 if not applicable or no change; 1 if change | |
794 | * | |
795 | * Note: this function is invoked from the block subsystem. | |
796 | **/ | |
797 | static int sd_media_changed(struct gendisk *disk) | |
798 | { | |
799 | struct scsi_disk *sdkp = scsi_disk(disk); | |
800 | struct scsi_device *sdp = sdkp->device; | |
001aac25 | 801 | struct scsi_sense_hdr *sshdr = NULL; |
1da177e4 LT |
802 | int retval; |
803 | ||
fa0d34be | 804 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, "sd_media_changed\n")); |
1da177e4 LT |
805 | |
806 | if (!sdp->removable) | |
807 | return 0; | |
808 | ||
809 | /* | |
810 | * If the device is offline, don't send any commands - just pretend as | |
811 | * if the command failed. If the device ever comes back online, we | |
812 | * can deal with it then. It is only because of unrecoverable errors | |
813 | * that we would ever take a device offline in the first place. | |
814 | */ | |
285e9670 KS |
815 | if (!scsi_device_online(sdp)) { |
816 | set_media_not_present(sdkp); | |
817 | retval = 1; | |
818 | goto out; | |
819 | } | |
1da177e4 LT |
820 | |
821 | /* | |
822 | * Using TEST_UNIT_READY enables differentiation between drive with | |
823 | * no cartridge loaded - NOT READY, drive with changed cartridge - | |
824 | * UNIT ATTENTION, or with same cartridge - GOOD STATUS. | |
825 | * | |
826 | * Drives that auto spin down. eg iomega jaz 1G, will be started | |
827 | * by sd_spinup_disk() from sd_revalidate_disk(), which happens whenever | |
828 | * sd_revalidate() is called. | |
829 | */ | |
830 | retval = -ENODEV; | |
285e9670 | 831 | |
001aac25 JB |
832 | if (scsi_block_when_processing_errors(sdp)) { |
833 | sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); | |
834 | retval = scsi_test_unit_ready(sdp, SD_TIMEOUT, SD_MAX_RETRIES, | |
835 | sshdr); | |
836 | } | |
1da177e4 LT |
837 | |
838 | /* | |
839 | * Unable to test, unit probably not ready. This usually | |
840 | * means there is no disc in the drive. Mark as changed, | |
841 | * and we will figure it out later once the drive is | |
842 | * available again. | |
843 | */ | |
001aac25 JB |
844 | if (retval || (scsi_sense_valid(sshdr) && |
845 | /* 0x3a is medium not present */ | |
846 | sshdr->asc == 0x3a)) { | |
285e9670 KS |
847 | set_media_not_present(sdkp); |
848 | retval = 1; | |
849 | goto out; | |
850 | } | |
1da177e4 LT |
851 | |
852 | /* | |
853 | * For removable scsi disk we have to recognise the presence | |
854 | * of a disk in the drive. This is kept in the struct scsi_disk | |
855 | * struct and tested at open ! Daniel Roche (dan@lectra.fr) | |
856 | */ | |
857 | sdkp->media_present = 1; | |
858 | ||
859 | retval = sdp->changed; | |
860 | sdp->changed = 0; | |
285e9670 KS |
861 | out: |
862 | if (retval != sdkp->previous_state) | |
863 | sdev_evt_send_simple(sdp, SDEV_EVT_MEDIA_CHANGE, GFP_KERNEL); | |
864 | sdkp->previous_state = retval; | |
001aac25 | 865 | kfree(sshdr); |
1da177e4 | 866 | return retval; |
1da177e4 LT |
867 | } |
868 | ||
e73aec82 | 869 | static int sd_sync_cache(struct scsi_disk *sdkp) |
1da177e4 | 870 | { |
1da177e4 | 871 | int retries, res; |
e73aec82 | 872 | struct scsi_device *sdp = sdkp->device; |
ea73a9f2 | 873 | struct scsi_sense_hdr sshdr; |
1da177e4 LT |
874 | |
875 | if (!scsi_device_online(sdp)) | |
876 | return -ENODEV; | |
877 | ||
1da177e4 | 878 | |
1da177e4 LT |
879 | for (retries = 3; retries > 0; --retries) { |
880 | unsigned char cmd[10] = { 0 }; | |
881 | ||
882 | cmd[0] = SYNCHRONIZE_CACHE; | |
883 | /* | |
884 | * Leave the rest of the command zero to indicate | |
885 | * flush everything. | |
886 | */ | |
ea73a9f2 JB |
887 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, |
888 | SD_TIMEOUT, SD_MAX_RETRIES); | |
889 | if (res == 0) | |
1da177e4 LT |
890 | break; |
891 | } | |
892 | ||
e73aec82 MP |
893 | if (res) { |
894 | sd_print_result(sdkp, res); | |
895 | if (driver_byte(res) & DRIVER_SENSE) | |
896 | sd_print_sense_hdr(sdkp, &sshdr); | |
1da177e4 LT |
897 | } |
898 | ||
3721050a TH |
899 | if (res) |
900 | return -EIO; | |
901 | return 0; | |
1da177e4 LT |
902 | } |
903 | ||
165125e1 | 904 | static void sd_prepare_flush(struct request_queue *q, struct request *rq) |
1da177e4 | 905 | { |
4aff5e23 | 906 | rq->cmd_type = REQ_TYPE_BLOCK_PC; |
c0ed79a3 JB |
907 | rq->timeout = SD_TIMEOUT; |
908 | rq->cmd[0] = SYNCHRONIZE_CACHE; | |
461d4e90 | 909 | rq->cmd_len = 10; |
1da177e4 LT |
910 | } |
911 | ||
912 | static void sd_rescan(struct device *dev) | |
913 | { | |
39b7f1e2 AS |
914 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
915 | ||
916 | if (sdkp) { | |
917 | sd_revalidate_disk(sdkp->disk); | |
918 | scsi_disk_put(sdkp); | |
919 | } | |
1da177e4 LT |
920 | } |
921 | ||
922 | ||
923 | #ifdef CONFIG_COMPAT | |
924 | /* | |
925 | * This gets directly called from VFS. When the ioctl | |
926 | * is not recognized we go back to the other translation paths. | |
927 | */ | |
928 | static long sd_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
929 | { | |
7ac6207b | 930 | struct block_device *bdev = file->f_path.dentry->d_inode->i_bdev; |
1da177e4 LT |
931 | struct gendisk *disk = bdev->bd_disk; |
932 | struct scsi_device *sdev = scsi_disk(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 | .ioctl = sd_ioctl, | |
a885c8c4 | 963 | .getgeo = sd_getgeo, |
1da177e4 LT |
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 | ||
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: | |
1054 | case NO_SENSE: | |
1055 | /* Inform the user, but make sure that it's not treated | |
1056 | * as a hard error. | |
1057 | */ | |
1058 | scsi_print_sense("sd", SCpnt); | |
1059 | SCpnt->result = 0; | |
1060 | memset(SCpnt->sense_buffer, 0, SCSI_SENSE_BUFFERSIZE); | |
af55ff67 MP |
1061 | good_bytes = scsi_bufflen(SCpnt); |
1062 | break; | |
1063 | case ABORTED_COMMAND: | |
1064 | if (sshdr.asc == 0x10) { /* DIF: Disk detected corruption */ | |
1065 | scsi_print_result(SCpnt); | |
1066 | scsi_print_sense("sd", SCpnt); | |
1067 | good_bytes = sd_completed_bytes(SCpnt); | |
1068 | } | |
03aba2f7 LT |
1069 | break; |
1070 | case ILLEGAL_REQUEST: | |
af55ff67 MP |
1071 | if (sshdr.asc == 0x10) { /* DIX: HBA detected corruption */ |
1072 | scsi_print_result(SCpnt); | |
1073 | scsi_print_sense("sd", SCpnt); | |
1074 | good_bytes = sd_completed_bytes(SCpnt); | |
1075 | } | |
1076 | if (!scsi_device_protection(SCpnt->device) && | |
1077 | SCpnt->device->use_10_for_rw && | |
03aba2f7 LT |
1078 | (SCpnt->cmnd[0] == READ_10 || |
1079 | SCpnt->cmnd[0] == WRITE_10)) | |
1080 | SCpnt->device->use_10_for_rw = 0; | |
1081 | if (SCpnt->device->use_10_for_ms && | |
1082 | (SCpnt->cmnd[0] == MODE_SENSE_10 || | |
1083 | SCpnt->cmnd[0] == MODE_SELECT_10)) | |
1084 | SCpnt->device->use_10_for_ms = 0; | |
1085 | break; | |
1086 | default: | |
1087 | break; | |
1da177e4 | 1088 | } |
03aba2f7 | 1089 | out: |
af55ff67 MP |
1090 | if (rq_data_dir(SCpnt->request) == READ && scsi_prot_sg_count(SCpnt)) |
1091 | sd_dif_complete(SCpnt, good_bytes); | |
1092 | ||
7b3d9545 | 1093 | return good_bytes; |
1da177e4 LT |
1094 | } |
1095 | ||
ea73a9f2 JB |
1096 | static int media_not_present(struct scsi_disk *sdkp, |
1097 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 1098 | { |
1da177e4 | 1099 | |
ea73a9f2 | 1100 | if (!scsi_sense_valid(sshdr)) |
1da177e4 LT |
1101 | return 0; |
1102 | /* not invoked for commands that could return deferred errors */ | |
ea73a9f2 JB |
1103 | if (sshdr->sense_key != NOT_READY && |
1104 | sshdr->sense_key != UNIT_ATTENTION) | |
1105 | return 0; | |
1106 | if (sshdr->asc != 0x3A) /* medium not present */ | |
1107 | return 0; | |
1108 | ||
1da177e4 LT |
1109 | set_media_not_present(sdkp); |
1110 | return 1; | |
1111 | } | |
1112 | ||
1113 | /* | |
1114 | * spinup disk - called only in sd_revalidate_disk() | |
1115 | */ | |
1116 | static void | |
e73aec82 | 1117 | sd_spinup_disk(struct scsi_disk *sdkp) |
ea73a9f2 | 1118 | { |
1da177e4 | 1119 | unsigned char cmd[10]; |
4451e472 | 1120 | unsigned long spintime_expire = 0; |
1da177e4 LT |
1121 | int retries, spintime; |
1122 | unsigned int the_result; | |
1123 | struct scsi_sense_hdr sshdr; | |
1124 | int sense_valid = 0; | |
1125 | ||
1126 | spintime = 0; | |
1127 | ||
1128 | /* Spin up drives, as required. Only do this at boot time */ | |
1129 | /* Spinup needs to be done for module loads too. */ | |
1130 | do { | |
1131 | retries = 0; | |
1132 | ||
1133 | do { | |
1134 | cmd[0] = TEST_UNIT_READY; | |
1135 | memset((void *) &cmd[1], 0, 9); | |
1136 | ||
ea73a9f2 JB |
1137 | the_result = scsi_execute_req(sdkp->device, cmd, |
1138 | DMA_NONE, NULL, 0, | |
1139 | &sshdr, SD_TIMEOUT, | |
1140 | SD_MAX_RETRIES); | |
1da177e4 | 1141 | |
b4d38e38 AS |
1142 | /* |
1143 | * If the drive has indicated to us that it | |
1144 | * doesn't have any media in it, don't bother | |
1145 | * with any more polling. | |
1146 | */ | |
1147 | if (media_not_present(sdkp, &sshdr)) | |
1148 | return; | |
1149 | ||
1da177e4 | 1150 | if (the_result) |
ea73a9f2 | 1151 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1152 | retries++; |
1153 | } while (retries < 3 && | |
1154 | (!scsi_status_is_good(the_result) || | |
1155 | ((driver_byte(the_result) & DRIVER_SENSE) && | |
1156 | sense_valid && sshdr.sense_key == UNIT_ATTENTION))); | |
1157 | ||
1da177e4 LT |
1158 | if ((driver_byte(the_result) & DRIVER_SENSE) == 0) { |
1159 | /* no sense, TUR either succeeded or failed | |
1160 | * with a status error */ | |
e73aec82 MP |
1161 | if(!spintime && !scsi_status_is_good(the_result)) { |
1162 | sd_printk(KERN_NOTICE, sdkp, "Unit Not Ready\n"); | |
1163 | sd_print_result(sdkp, the_result); | |
1164 | } | |
1da177e4 LT |
1165 | break; |
1166 | } | |
1167 | ||
1168 | /* | |
1169 | * The device does not want the automatic start to be issued. | |
1170 | */ | |
1171 | if (sdkp->device->no_start_on_add) { | |
1172 | break; | |
1173 | } | |
1174 | ||
1175 | /* | |
1176 | * If manual intervention is required, or this is an | |
1177 | * absent USB storage device, a spinup is meaningless. | |
1178 | */ | |
1179 | if (sense_valid && | |
1180 | sshdr.sense_key == NOT_READY && | |
1181 | sshdr.asc == 4 && sshdr.ascq == 3) { | |
1182 | break; /* manual intervention required */ | |
1183 | ||
1184 | /* | |
1185 | * Issue command to spin up drive when not ready | |
1186 | */ | |
1187 | } else if (sense_valid && sshdr.sense_key == NOT_READY) { | |
1188 | if (!spintime) { | |
e73aec82 | 1189 | sd_printk(KERN_NOTICE, sdkp, "Spinning up disk..."); |
1da177e4 LT |
1190 | cmd[0] = START_STOP; |
1191 | cmd[1] = 1; /* Return immediately */ | |
1192 | memset((void *) &cmd[2], 0, 8); | |
1193 | cmd[4] = 1; /* Start spin cycle */ | |
d2886ea3 SR |
1194 | if (sdkp->device->start_stop_pwr_cond) |
1195 | cmd[4] |= 1 << 4; | |
ea73a9f2 JB |
1196 | scsi_execute_req(sdkp->device, cmd, DMA_NONE, |
1197 | NULL, 0, &sshdr, | |
1198 | SD_TIMEOUT, SD_MAX_RETRIES); | |
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 | ||
1254 | switch (type) { | |
1255 | case SD_DIF_TYPE0_PROTECTION: | |
1256 | sdkp->protection_type = 0; | |
1257 | break; | |
1258 | ||
1259 | case SD_DIF_TYPE1_PROTECTION: | |
1260 | case SD_DIF_TYPE3_PROTECTION: | |
1261 | sdkp->protection_type = type; | |
1262 | break; | |
1263 | ||
1264 | case SD_DIF_TYPE2_PROTECTION: | |
1265 | sd_printk(KERN_ERR, sdkp, "formatted with DIF Type 2 " \ | |
1266 | "protection which is currently unsupported. " \ | |
1267 | "Disabling disk!\n"); | |
1268 | goto disable; | |
1269 | ||
1270 | default: | |
1271 | sd_printk(KERN_ERR, sdkp, "formatted with unknown " \ | |
1272 | "protection type %d. Disabling disk!\n", type); | |
1273 | goto disable; | |
1274 | } | |
1275 | ||
1276 | return; | |
1277 | ||
1278 | disable: | |
1279 | sdkp->protection_type = 0; | |
1280 | sdkp->capacity = 0; | |
1281 | } | |
1282 | ||
1da177e4 LT |
1283 | /* |
1284 | * read disk capacity | |
1285 | */ | |
1286 | static void | |
e73aec82 | 1287 | sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer) |
ea73a9f2 | 1288 | { |
1da177e4 | 1289 | unsigned char cmd[16]; |
1da177e4 LT |
1290 | int the_result, retries; |
1291 | int sector_size = 0; | |
e0597d70 MP |
1292 | /* Force READ CAPACITY(16) when PROTECT=1 */ |
1293 | int longrc = scsi_device_protection(sdkp->device) ? 1 : 0; | |
1da177e4 LT |
1294 | struct scsi_sense_hdr sshdr; |
1295 | int sense_valid = 0; | |
ea73a9f2 | 1296 | struct scsi_device *sdp = sdkp->device; |
1da177e4 LT |
1297 | |
1298 | repeat: | |
1299 | retries = 3; | |
1300 | do { | |
1301 | if (longrc) { | |
1302 | memset((void *) cmd, 0, 16); | |
1303 | cmd[0] = SERVICE_ACTION_IN; | |
1304 | cmd[1] = SAI_READ_CAPACITY_16; | |
e0597d70 MP |
1305 | cmd[13] = 13; |
1306 | memset((void *) buffer, 0, 13); | |
1da177e4 LT |
1307 | } else { |
1308 | cmd[0] = READ_CAPACITY; | |
1309 | memset((void *) &cmd[1], 0, 9); | |
1310 | memset((void *) buffer, 0, 8); | |
1311 | } | |
1312 | ||
ea73a9f2 | 1313 | the_result = scsi_execute_req(sdp, cmd, DMA_FROM_DEVICE, |
e0597d70 | 1314 | buffer, longrc ? 13 : 8, &sshdr, |
ea73a9f2 | 1315 | SD_TIMEOUT, SD_MAX_RETRIES); |
1da177e4 | 1316 | |
ea73a9f2 | 1317 | if (media_not_present(sdkp, &sshdr)) |
1da177e4 LT |
1318 | return; |
1319 | ||
1da177e4 | 1320 | if (the_result) |
ea73a9f2 | 1321 | sense_valid = scsi_sense_valid(&sshdr); |
1da177e4 LT |
1322 | retries--; |
1323 | ||
1324 | } while (the_result && retries); | |
1325 | ||
1326 | if (the_result && !longrc) { | |
e73aec82 MP |
1327 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY failed\n"); |
1328 | sd_print_result(sdkp, the_result); | |
1da177e4 | 1329 | if (driver_byte(the_result) & DRIVER_SENSE) |
e73aec82 | 1330 | sd_print_sense_hdr(sdkp, &sshdr); |
1da177e4 | 1331 | else |
e73aec82 | 1332 | sd_printk(KERN_NOTICE, sdkp, "Sense not available.\n"); |
1da177e4 LT |
1333 | |
1334 | /* Set dirty bit for removable devices if not ready - | |
1335 | * sometimes drives will not report this properly. */ | |
1336 | if (sdp->removable && | |
1337 | sense_valid && sshdr.sense_key == NOT_READY) | |
1338 | sdp->changed = 1; | |
1339 | ||
1340 | /* Either no media are present but the drive didn't tell us, | |
1341 | or they are present but the read capacity command fails */ | |
1342 | /* sdkp->media_present = 0; -- not always correct */ | |
69bdd88c | 1343 | sdkp->capacity = 0; /* unknown mapped to zero - as usual */ |
1da177e4 LT |
1344 | |
1345 | return; | |
1346 | } else if (the_result && longrc) { | |
1347 | /* READ CAPACITY(16) has been failed */ | |
e73aec82 MP |
1348 | sd_printk(KERN_NOTICE, sdkp, "READ CAPACITY(16) failed\n"); |
1349 | sd_print_result(sdkp, the_result); | |
1350 | sd_printk(KERN_NOTICE, sdkp, "Use 0xffffffff as device size\n"); | |
1351 | ||
1da177e4 LT |
1352 | sdkp->capacity = 1 + (sector_t) 0xffffffff; |
1353 | goto got_data; | |
1354 | } | |
1355 | ||
1356 | if (!longrc) { | |
1357 | sector_size = (buffer[4] << 24) | | |
1358 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
1359 | if (buffer[0] == 0xff && buffer[1] == 0xff && | |
1360 | buffer[2] == 0xff && buffer[3] == 0xff) { | |
1361 | if(sizeof(sdkp->capacity) > 4) { | |
e73aec82 MP |
1362 | sd_printk(KERN_NOTICE, sdkp, "Very big device. " |
1363 | "Trying to use READ CAPACITY(16).\n"); | |
1da177e4 LT |
1364 | longrc = 1; |
1365 | goto repeat; | |
1366 | } | |
e73aec82 MP |
1367 | sd_printk(KERN_ERR, sdkp, "Too big for this kernel. Use " |
1368 | "a kernel compiled with support for large " | |
1369 | "block devices.\n"); | |
1da177e4 LT |
1370 | sdkp->capacity = 0; |
1371 | goto got_data; | |
1372 | } | |
1373 | sdkp->capacity = 1 + (((sector_t)buffer[0] << 24) | | |
1374 | (buffer[1] << 16) | | |
1375 | (buffer[2] << 8) | | |
1376 | buffer[3]); | |
1377 | } else { | |
1378 | sdkp->capacity = 1 + (((u64)buffer[0] << 56) | | |
1379 | ((u64)buffer[1] << 48) | | |
1380 | ((u64)buffer[2] << 40) | | |
1381 | ((u64)buffer[3] << 32) | | |
1382 | ((sector_t)buffer[4] << 24) | | |
1383 | ((sector_t)buffer[5] << 16) | | |
1384 | ((sector_t)buffer[6] << 8) | | |
1385 | (sector_t)buffer[7]); | |
1386 | ||
1387 | sector_size = (buffer[8] << 24) | | |
1388 | (buffer[9] << 16) | (buffer[10] << 8) | buffer[11]; | |
e0597d70 MP |
1389 | |
1390 | sd_read_protection_type(sdkp, buffer); | |
1da177e4 LT |
1391 | } |
1392 | ||
1393 | /* Some devices return the total number of sectors, not the | |
1394 | * highest sector number. Make the necessary adjustment. */ | |
61bf54b7 | 1395 | if (sdp->fix_capacity) { |
1da177e4 LT |
1396 | --sdkp->capacity; |
1397 | ||
61bf54b7 ON |
1398 | /* Some devices have version which report the correct sizes |
1399 | * and others which do not. We guess size according to a heuristic | |
1400 | * and err on the side of lowering the capacity. */ | |
1401 | } else { | |
1402 | if (sdp->guess_capacity) | |
1403 | if (sdkp->capacity & 0x01) /* odd sizes are odd */ | |
1404 | --sdkp->capacity; | |
1405 | } | |
1406 | ||
1da177e4 LT |
1407 | got_data: |
1408 | if (sector_size == 0) { | |
1409 | sector_size = 512; | |
e73aec82 MP |
1410 | sd_printk(KERN_NOTICE, sdkp, "Sector size 0 reported, " |
1411 | "assuming 512.\n"); | |
1da177e4 LT |
1412 | } |
1413 | ||
1414 | if (sector_size != 512 && | |
1415 | sector_size != 1024 && | |
1416 | sector_size != 2048 && | |
1417 | sector_size != 4096 && | |
1418 | sector_size != 256) { | |
e73aec82 MP |
1419 | sd_printk(KERN_NOTICE, sdkp, "Unsupported sector size %d.\n", |
1420 | sector_size); | |
1da177e4 LT |
1421 | /* |
1422 | * The user might want to re-format the drive with | |
1423 | * a supported sectorsize. Once this happens, it | |
1424 | * would be relatively trivial to set the thing up. | |
1425 | * For this reason, we leave the thing in the table. | |
1426 | */ | |
1427 | sdkp->capacity = 0; | |
1428 | /* | |
1429 | * set a bogus sector size so the normal read/write | |
1430 | * logic in the block layer will eventually refuse any | |
1431 | * request on this device without tripping over power | |
1432 | * of two sector size assumptions | |
1433 | */ | |
1434 | sector_size = 512; | |
1435 | } | |
1436 | { | |
1437 | /* | |
1438 | * The msdos fs needs to know the hardware sector size | |
1439 | * So I have created this table. See ll_rw_blk.c | |
1440 | * Jacques Gelinas (Jacques@solucorp.qc.ca) | |
1441 | */ | |
1442 | int hard_sector = sector_size; | |
7a691bd3 | 1443 | sector_t sz = (sdkp->capacity/2) * (hard_sector/256); |
165125e1 | 1444 | struct request_queue *queue = sdp->request_queue; |
7a691bd3 | 1445 | sector_t mb = sz; |
1da177e4 LT |
1446 | |
1447 | blk_queue_hardsect_size(queue, hard_sector); | |
1448 | /* avoid 64-bit division on 32-bit platforms */ | |
7a691bd3 | 1449 | sector_div(sz, 625); |
1da177e4 LT |
1450 | mb -= sz - 974; |
1451 | sector_div(mb, 1950); | |
1452 | ||
e73aec82 MP |
1453 | sd_printk(KERN_NOTICE, sdkp, |
1454 | "%llu %d-byte hardware sectors (%llu MB)\n", | |
1455 | (unsigned long long)sdkp->capacity, | |
1456 | hard_sector, (unsigned long long)mb); | |
1da177e4 LT |
1457 | } |
1458 | ||
1459 | /* Rescale capacity to 512-byte units */ | |
1460 | if (sector_size == 4096) | |
1461 | sdkp->capacity <<= 3; | |
1462 | else if (sector_size == 2048) | |
1463 | sdkp->capacity <<= 2; | |
1464 | else if (sector_size == 1024) | |
1465 | sdkp->capacity <<= 1; | |
1466 | else if (sector_size == 256) | |
1467 | sdkp->capacity >>= 1; | |
1468 | ||
1469 | sdkp->device->sector_size = sector_size; | |
1470 | } | |
1471 | ||
1472 | /* called with buffer of length 512 */ | |
1473 | static inline int | |
ea73a9f2 JB |
1474 | sd_do_mode_sense(struct scsi_device *sdp, int dbd, int modepage, |
1475 | unsigned char *buffer, int len, struct scsi_mode_data *data, | |
1476 | struct scsi_sense_hdr *sshdr) | |
1da177e4 | 1477 | { |
ea73a9f2 | 1478 | return scsi_mode_sense(sdp, dbd, modepage, buffer, len, |
1cf72699 | 1479 | SD_TIMEOUT, SD_MAX_RETRIES, data, |
ea73a9f2 | 1480 | sshdr); |
1da177e4 LT |
1481 | } |
1482 | ||
1483 | /* | |
1484 | * read write protect setting, if possible - called only in sd_revalidate_disk() | |
48970800 | 1485 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1486 | */ |
1487 | static void | |
e73aec82 | 1488 | sd_read_write_protect_flag(struct scsi_disk *sdkp, unsigned char *buffer) |
ea73a9f2 | 1489 | { |
1da177e4 | 1490 | int res; |
ea73a9f2 | 1491 | struct scsi_device *sdp = sdkp->device; |
1da177e4 LT |
1492 | struct scsi_mode_data data; |
1493 | ||
1494 | set_disk_ro(sdkp->disk, 0); | |
ea73a9f2 | 1495 | if (sdp->skip_ms_page_3f) { |
e73aec82 | 1496 | sd_printk(KERN_NOTICE, sdkp, "Assuming Write Enabled\n"); |
1da177e4 LT |
1497 | return; |
1498 | } | |
1499 | ||
ea73a9f2 JB |
1500 | if (sdp->use_192_bytes_for_3f) { |
1501 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 192, &data, NULL); | |
1da177e4 LT |
1502 | } else { |
1503 | /* | |
1504 | * First attempt: ask for all pages (0x3F), but only 4 bytes. | |
1505 | * We have to start carefully: some devices hang if we ask | |
1506 | * for more than is available. | |
1507 | */ | |
ea73a9f2 | 1508 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 4, &data, NULL); |
1da177e4 LT |
1509 | |
1510 | /* | |
1511 | * Second attempt: ask for page 0 When only page 0 is | |
1512 | * implemented, a request for page 3F may return Sense Key | |
1513 | * 5: Illegal Request, Sense Code 24: Invalid field in | |
1514 | * CDB. | |
1515 | */ | |
1516 | if (!scsi_status_is_good(res)) | |
ea73a9f2 | 1517 | res = sd_do_mode_sense(sdp, 0, 0, buffer, 4, &data, NULL); |
1da177e4 LT |
1518 | |
1519 | /* | |
1520 | * Third attempt: ask 255 bytes, as we did earlier. | |
1521 | */ | |
1522 | if (!scsi_status_is_good(res)) | |
ea73a9f2 JB |
1523 | res = sd_do_mode_sense(sdp, 0, 0x3F, buffer, 255, |
1524 | &data, NULL); | |
1da177e4 LT |
1525 | } |
1526 | ||
1527 | if (!scsi_status_is_good(res)) { | |
e73aec82 MP |
1528 | sd_printk(KERN_WARNING, sdkp, |
1529 | "Test WP failed, assume Write Enabled\n"); | |
1da177e4 LT |
1530 | } else { |
1531 | sdkp->write_prot = ((data.device_specific & 0x80) != 0); | |
1532 | set_disk_ro(sdkp->disk, sdkp->write_prot); | |
e73aec82 MP |
1533 | sd_printk(KERN_NOTICE, sdkp, "Write Protect is %s\n", |
1534 | sdkp->write_prot ? "on" : "off"); | |
1535 | sd_printk(KERN_DEBUG, sdkp, | |
1536 | "Mode Sense: %02x %02x %02x %02x\n", | |
1537 | buffer[0], buffer[1], buffer[2], buffer[3]); | |
1da177e4 LT |
1538 | } |
1539 | } | |
1540 | ||
1541 | /* | |
1542 | * sd_read_cache_type - called only from sd_revalidate_disk() | |
48970800 | 1543 | * called with buffer of length SD_BUF_SIZE |
1da177e4 LT |
1544 | */ |
1545 | static void | |
e73aec82 | 1546 | sd_read_cache_type(struct scsi_disk *sdkp, unsigned char *buffer) |
631e8a13 | 1547 | { |
1da177e4 | 1548 | int len = 0, res; |
ea73a9f2 | 1549 | struct scsi_device *sdp = sdkp->device; |
1da177e4 | 1550 | |
631e8a13 AV |
1551 | int dbd; |
1552 | int modepage; | |
1da177e4 LT |
1553 | struct scsi_mode_data data; |
1554 | struct scsi_sense_hdr sshdr; | |
1555 | ||
ea73a9f2 | 1556 | if (sdp->skip_ms_page_8) |
1da177e4 LT |
1557 | goto defaults; |
1558 | ||
ea73a9f2 | 1559 | if (sdp->type == TYPE_RBC) { |
631e8a13 AV |
1560 | modepage = 6; |
1561 | dbd = 8; | |
1562 | } else { | |
1563 | modepage = 8; | |
1564 | dbd = 0; | |
1565 | } | |
1566 | ||
1da177e4 | 1567 | /* cautiously ask */ |
ea73a9f2 | 1568 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, 4, &data, &sshdr); |
1da177e4 LT |
1569 | |
1570 | if (!scsi_status_is_good(res)) | |
1571 | goto bad_sense; | |
1572 | ||
6d73c851 AV |
1573 | if (!data.header_length) { |
1574 | modepage = 6; | |
e73aec82 | 1575 | sd_printk(KERN_ERR, sdkp, "Missing header in MODE_SENSE response\n"); |
6d73c851 AV |
1576 | } |
1577 | ||
1da177e4 LT |
1578 | /* that went OK, now ask for the proper length */ |
1579 | len = data.length; | |
1580 | ||
1581 | /* | |
1582 | * We're only interested in the first three bytes, actually. | |
1583 | * But the data cache page is defined for the first 20. | |
1584 | */ | |
1585 | if (len < 3) | |
1586 | goto bad_sense; | |
1587 | if (len > 20) | |
1588 | len = 20; | |
1589 | ||
1590 | /* Take headers and block descriptors into account */ | |
1591 | len += data.header_length + data.block_descriptor_length; | |
48970800 AV |
1592 | if (len > SD_BUF_SIZE) |
1593 | goto bad_sense; | |
1da177e4 LT |
1594 | |
1595 | /* Get the data */ | |
ea73a9f2 | 1596 | res = sd_do_mode_sense(sdp, dbd, modepage, buffer, len, &data, &sshdr); |
1da177e4 LT |
1597 | |
1598 | if (scsi_status_is_good(res)) { | |
631e8a13 | 1599 | int offset = data.header_length + data.block_descriptor_length; |
1da177e4 | 1600 | |
48970800 | 1601 | if (offset >= SD_BUF_SIZE - 2) { |
e73aec82 | 1602 | sd_printk(KERN_ERR, sdkp, "Malformed MODE SENSE response\n"); |
48970800 AV |
1603 | goto defaults; |
1604 | } | |
1605 | ||
631e8a13 | 1606 | if ((buffer[offset] & 0x3f) != modepage) { |
e73aec82 | 1607 | sd_printk(KERN_ERR, sdkp, "Got wrong page\n"); |
631e8a13 AV |
1608 | goto defaults; |
1609 | } | |
1610 | ||
1611 | if (modepage == 8) { | |
1612 | sdkp->WCE = ((buffer[offset + 2] & 0x04) != 0); | |
1613 | sdkp->RCD = ((buffer[offset + 2] & 0x01) != 0); | |
1614 | } else { | |
1615 | sdkp->WCE = ((buffer[offset + 2] & 0x01) == 0); | |
1616 | sdkp->RCD = 0; | |
1617 | } | |
1da177e4 | 1618 | |
007365ad TH |
1619 | sdkp->DPOFUA = (data.device_specific & 0x10) != 0; |
1620 | if (sdkp->DPOFUA && !sdkp->device->use_10_for_rw) { | |
e73aec82 MP |
1621 | sd_printk(KERN_NOTICE, sdkp, |
1622 | "Uses READ/WRITE(6), disabling FUA\n"); | |
007365ad TH |
1623 | sdkp->DPOFUA = 0; |
1624 | } | |
1625 | ||
e73aec82 MP |
1626 | sd_printk(KERN_NOTICE, sdkp, |
1627 | "Write cache: %s, read cache: %s, %s\n", | |
fd44bab5 LT |
1628 | sdkp->WCE ? "enabled" : "disabled", |
1629 | sdkp->RCD ? "disabled" : "enabled", | |
1630 | sdkp->DPOFUA ? "supports DPO and FUA" | |
1631 | : "doesn't support DPO or FUA"); | |
1da177e4 LT |
1632 | |
1633 | return; | |
1634 | } | |
1635 | ||
1636 | bad_sense: | |
ea73a9f2 | 1637 | if (scsi_sense_valid(&sshdr) && |
1da177e4 LT |
1638 | sshdr.sense_key == ILLEGAL_REQUEST && |
1639 | sshdr.asc == 0x24 && sshdr.ascq == 0x0) | |
e73aec82 MP |
1640 | /* Invalid field in CDB */ |
1641 | sd_printk(KERN_NOTICE, sdkp, "Cache data unavailable\n"); | |
1da177e4 | 1642 | else |
e73aec82 | 1643 | sd_printk(KERN_ERR, sdkp, "Asking for cache data failed\n"); |
1da177e4 LT |
1644 | |
1645 | defaults: | |
e73aec82 | 1646 | sd_printk(KERN_ERR, sdkp, "Assuming drive cache: write through\n"); |
1da177e4 LT |
1647 | sdkp->WCE = 0; |
1648 | sdkp->RCD = 0; | |
48970800 | 1649 | sdkp->DPOFUA = 0; |
1da177e4 LT |
1650 | } |
1651 | ||
e0597d70 MP |
1652 | /* |
1653 | * The ATO bit indicates whether the DIF application tag is available | |
1654 | * for use by the operating system. | |
1655 | */ | |
1656 | void sd_read_app_tag_own(struct scsi_disk *sdkp, unsigned char *buffer) | |
1657 | { | |
1658 | int res, offset; | |
1659 | struct scsi_device *sdp = sdkp->device; | |
1660 | struct scsi_mode_data data; | |
1661 | struct scsi_sense_hdr sshdr; | |
1662 | ||
1663 | if (sdp->type != TYPE_DISK) | |
1664 | return; | |
1665 | ||
1666 | if (sdkp->protection_type == 0) | |
1667 | return; | |
1668 | ||
1669 | res = scsi_mode_sense(sdp, 1, 0x0a, buffer, 36, SD_TIMEOUT, | |
1670 | SD_MAX_RETRIES, &data, &sshdr); | |
1671 | ||
1672 | if (!scsi_status_is_good(res) || !data.header_length || | |
1673 | data.length < 6) { | |
1674 | sd_printk(KERN_WARNING, sdkp, | |
1675 | "getting Control mode page failed, assume no ATO\n"); | |
1676 | ||
1677 | if (scsi_sense_valid(&sshdr)) | |
1678 | sd_print_sense_hdr(sdkp, &sshdr); | |
1679 | ||
1680 | return; | |
1681 | } | |
1682 | ||
1683 | offset = data.header_length + data.block_descriptor_length; | |
1684 | ||
1685 | if ((buffer[offset] & 0x3f) != 0x0a) { | |
1686 | sd_printk(KERN_ERR, sdkp, "ATO Got wrong page\n"); | |
1687 | return; | |
1688 | } | |
1689 | ||
1690 | if ((buffer[offset + 5] & 0x80) == 0) | |
1691 | return; | |
1692 | ||
1693 | sdkp->ATO = 1; | |
1694 | ||
1695 | return; | |
1696 | } | |
1697 | ||
1da177e4 LT |
1698 | /** |
1699 | * sd_revalidate_disk - called the first time a new disk is seen, | |
1700 | * performs disk spin up, read_capacity, etc. | |
1701 | * @disk: struct gendisk we care about | |
1702 | **/ | |
1703 | static int sd_revalidate_disk(struct gendisk *disk) | |
1704 | { | |
1705 | struct scsi_disk *sdkp = scsi_disk(disk); | |
1706 | struct scsi_device *sdp = sdkp->device; | |
1da177e4 | 1707 | unsigned char *buffer; |
461d4e90 | 1708 | unsigned ordered; |
1da177e4 | 1709 | |
fa0d34be MP |
1710 | SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp, |
1711 | "sd_revalidate_disk\n")); | |
1da177e4 LT |
1712 | |
1713 | /* | |
1714 | * If the device is offline, don't try and read capacity or any | |
1715 | * of the other niceties. | |
1716 | */ | |
1717 | if (!scsi_device_online(sdp)) | |
1718 | goto out; | |
1719 | ||
a6123f14 | 1720 | buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL); |
1da177e4 | 1721 | if (!buffer) { |
e73aec82 MP |
1722 | sd_printk(KERN_WARNING, sdkp, "sd_revalidate_disk: Memory " |
1723 | "allocation failure.\n"); | |
ea73a9f2 | 1724 | goto out; |
1da177e4 LT |
1725 | } |
1726 | ||
1727 | /* defaults, until the device tells us otherwise */ | |
1728 | sdp->sector_size = 512; | |
1729 | sdkp->capacity = 0; | |
1730 | sdkp->media_present = 1; | |
1731 | sdkp->write_prot = 0; | |
1732 | sdkp->WCE = 0; | |
1733 | sdkp->RCD = 0; | |
e0597d70 | 1734 | sdkp->ATO = 0; |
1da177e4 | 1735 | |
e73aec82 | 1736 | sd_spinup_disk(sdkp); |
1da177e4 LT |
1737 | |
1738 | /* | |
1739 | * Without media there is no reason to ask; moreover, some devices | |
1740 | * react badly if we do. | |
1741 | */ | |
1742 | if (sdkp->media_present) { | |
e73aec82 MP |
1743 | sd_read_capacity(sdkp, buffer); |
1744 | sd_read_write_protect_flag(sdkp, buffer); | |
1745 | sd_read_cache_type(sdkp, buffer); | |
e0597d70 | 1746 | sd_read_app_tag_own(sdkp, buffer); |
1da177e4 | 1747 | } |
461d4e90 TH |
1748 | |
1749 | /* | |
1750 | * We now have all cache related info, determine how we deal | |
1751 | * with ordered requests. Note that as the current SCSI | |
1752 | * dispatch function can alter request order, we cannot use | |
1753 | * QUEUE_ORDERED_TAG_* even when ordered tag is supported. | |
1754 | */ | |
1755 | if (sdkp->WCE) | |
007365ad TH |
1756 | ordered = sdkp->DPOFUA |
1757 | ? QUEUE_ORDERED_DRAIN_FUA : QUEUE_ORDERED_DRAIN_FLUSH; | |
461d4e90 TH |
1758 | else |
1759 | ordered = QUEUE_ORDERED_DRAIN; | |
1760 | ||
1761 | blk_queue_ordered(sdkp->disk->queue, ordered, sd_prepare_flush); | |
1762 | ||
1da177e4 LT |
1763 | set_capacity(disk, sdkp->capacity); |
1764 | kfree(buffer); | |
1765 | ||
1da177e4 LT |
1766 | out: |
1767 | return 0; | |
1768 | } | |
1769 | ||
1770 | /** | |
1771 | * sd_probe - called during driver initialization and whenever a | |
1772 | * new scsi device is attached to the system. It is called once | |
1773 | * for each scsi device (not just disks) present. | |
1774 | * @dev: pointer to device object | |
1775 | * | |
1776 | * Returns 0 if successful (or not interested in this scsi device | |
1777 | * (e.g. scanner)); 1 when there is an error. | |
1778 | * | |
1779 | * Note: this function is invoked from the scsi mid-level. | |
1780 | * This function sets up the mapping between a given | |
1781 | * <host,channel,id,lun> (found in sdp) and new device name | |
1782 | * (e.g. /dev/sda). More precisely it is the block device major | |
1783 | * and minor number that is chosen here. | |
1784 | * | |
1785 | * Assume sd_attach is not re-entrant (for time being) | |
1786 | * Also think about sd_attach() and sd_remove() running coincidentally. | |
1787 | **/ | |
1788 | static int sd_probe(struct device *dev) | |
1789 | { | |
1790 | struct scsi_device *sdp = to_scsi_device(dev); | |
1791 | struct scsi_disk *sdkp; | |
1792 | struct gendisk *gd; | |
1793 | u32 index; | |
1794 | int error; | |
1795 | ||
1796 | error = -ENODEV; | |
631e8a13 | 1797 | if (sdp->type != TYPE_DISK && sdp->type != TYPE_MOD && sdp->type != TYPE_RBC) |
1da177e4 LT |
1798 | goto out; |
1799 | ||
9ccfc756 JB |
1800 | SCSI_LOG_HLQUEUE(3, sdev_printk(KERN_INFO, sdp, |
1801 | "sd_attach\n")); | |
1da177e4 LT |
1802 | |
1803 | error = -ENOMEM; | |
24669f75 | 1804 | sdkp = kzalloc(sizeof(*sdkp), GFP_KERNEL); |
1da177e4 LT |
1805 | if (!sdkp) |
1806 | goto out; | |
1807 | ||
f615b48c | 1808 | gd = alloc_disk_ext(SD_MINORS, SD_EXT_MINORS); |
1da177e4 LT |
1809 | if (!gd) |
1810 | goto out_free; | |
1811 | ||
f27bac27 TH |
1812 | do { |
1813 | if (!ida_pre_get(&sd_index_ida, GFP_KERNEL)) | |
1814 | goto out_put; | |
1da177e4 | 1815 | |
f27bac27 TH |
1816 | error = ida_get_new(&sd_index_ida, &index); |
1817 | } while (error == -EAGAIN); | |
1da177e4 | 1818 | |
1da177e4 LT |
1819 | if (error) |
1820 | goto out_put; | |
1821 | ||
f27bac27 TH |
1822 | error = -EBUSY; |
1823 | if (index >= SD_MAX_DISKS) | |
1824 | goto out_free_index; | |
1825 | ||
1da177e4 LT |
1826 | sdkp->device = sdp; |
1827 | sdkp->driver = &sd_template; | |
1828 | sdkp->disk = gd; | |
1829 | sdkp->index = index; | |
1830 | sdkp->openers = 0; | |
c02e6002 | 1831 | sdkp->previous_state = 1; |
1da177e4 LT |
1832 | |
1833 | if (!sdp->timeout) { | |
631e8a13 | 1834 | if (sdp->type != TYPE_MOD) |
1da177e4 LT |
1835 | sdp->timeout = SD_TIMEOUT; |
1836 | else | |
1837 | sdp->timeout = SD_MOD_TIMEOUT; | |
1838 | } | |
1839 | ||
ee959b00 TJ |
1840 | device_initialize(&sdkp->dev); |
1841 | sdkp->dev.parent = &sdp->sdev_gendev; | |
1842 | sdkp->dev.class = &sd_disk_class; | |
1843 | strncpy(sdkp->dev.bus_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE); | |
017f2e37 | 1844 | |
ee959b00 | 1845 | if (device_add(&sdkp->dev)) |
f27bac27 | 1846 | goto out_free_index; |
017f2e37 NST |
1847 | |
1848 | get_device(&sdp->sdev_gendev); | |
1849 | ||
1da177e4 LT |
1850 | gd->major = sd_major((index & 0xf0) >> 4); |
1851 | gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00); | |
f615b48c TH |
1852 | gd->minors = SD_MINORS; |
1853 | gd->ext_minors = SD_EXT_MINORS; | |
1da177e4 LT |
1854 | gd->fops = &sd_fops; |
1855 | ||
1856 | if (index < 26) { | |
1857 | sprintf(gd->disk_name, "sd%c", 'a' + index % 26); | |
1858 | } else if (index < (26 + 1) * 26) { | |
1859 | sprintf(gd->disk_name, "sd%c%c", | |
1860 | 'a' + index / 26 - 1,'a' + index % 26); | |
1861 | } else { | |
1862 | const unsigned int m1 = (index / 26 - 1) / 26 - 1; | |
1863 | const unsigned int m2 = (index / 26 - 1) % 26; | |
1864 | const unsigned int m3 = index % 26; | |
1865 | sprintf(gd->disk_name, "sd%c%c%c", | |
1866 | 'a' + m1, 'a' + m2, 'a' + m3); | |
1867 | } | |
1868 | ||
1da177e4 | 1869 | gd->private_data = &sdkp->driver; |
461d4e90 | 1870 | gd->queue = sdkp->device->request_queue; |
1da177e4 LT |
1871 | |
1872 | sd_revalidate_disk(gd); | |
1873 | ||
7f9a6bc4 | 1874 | blk_queue_prep_rq(sdp->request_queue, sd_prep_fn); |
03a5743a | 1875 | |
1da177e4 LT |
1876 | gd->driverfs_dev = &sdp->sdev_gendev; |
1877 | gd->flags = GENHD_FL_DRIVERFS; | |
1878 | if (sdp->removable) | |
1879 | gd->flags |= GENHD_FL_REMOVABLE; | |
1da177e4 LT |
1880 | |
1881 | dev_set_drvdata(dev, sdkp); | |
1882 | add_disk(gd); | |
af55ff67 | 1883 | sd_dif_config_host(sdkp); |
1da177e4 | 1884 | |
e73aec82 MP |
1885 | sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n", |
1886 | sdp->removable ? "removable " : ""); | |
1da177e4 LT |
1887 | |
1888 | return 0; | |
1889 | ||
f27bac27 TH |
1890 | out_free_index: |
1891 | ida_remove(&sd_index_ida, index); | |
6bdaa1f1 | 1892 | out_put: |
1da177e4 | 1893 | put_disk(gd); |
6bdaa1f1 | 1894 | out_free: |
1da177e4 | 1895 | kfree(sdkp); |
6bdaa1f1 | 1896 | out: |
1da177e4 LT |
1897 | return error; |
1898 | } | |
1899 | ||
1900 | /** | |
1901 | * sd_remove - called whenever a scsi disk (previously recognized by | |
1902 | * sd_probe) is detached from the system. It is called (potentially | |
1903 | * multiple times) during sd module unload. | |
1904 | * @sdp: pointer to mid level scsi device object | |
1905 | * | |
1906 | * Note: this function is invoked from the scsi mid-level. | |
1907 | * This function potentially frees up a device name (e.g. /dev/sdc) | |
1908 | * that could be re-used by a subsequent sd_probe(). | |
1909 | * This function is not called when the built-in sd driver is "exit-ed". | |
1910 | **/ | |
1911 | static int sd_remove(struct device *dev) | |
1912 | { | |
1913 | struct scsi_disk *sdkp = dev_get_drvdata(dev); | |
1914 | ||
ee959b00 | 1915 | device_del(&sdkp->dev); |
1da177e4 LT |
1916 | del_gendisk(sdkp->disk); |
1917 | sd_shutdown(dev); | |
39b7f1e2 | 1918 | |
0b950672 | 1919 | mutex_lock(&sd_ref_mutex); |
39b7f1e2 | 1920 | dev_set_drvdata(dev, NULL); |
ee959b00 | 1921 | put_device(&sdkp->dev); |
0b950672 | 1922 | mutex_unlock(&sd_ref_mutex); |
1da177e4 LT |
1923 | |
1924 | return 0; | |
1925 | } | |
1926 | ||
1927 | /** | |
1928 | * scsi_disk_release - Called to free the scsi_disk structure | |
ee959b00 | 1929 | * @dev: pointer to embedded class device |
1da177e4 | 1930 | * |
0b950672 | 1931 | * sd_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
1932 | * called on last put, you should always use the scsi_disk_get() |
1933 | * scsi_disk_put() helpers which manipulate the semaphore directly | |
ee959b00 | 1934 | * and never do a direct put_device. |
1da177e4 | 1935 | **/ |
ee959b00 | 1936 | static void scsi_disk_release(struct device *dev) |
1da177e4 | 1937 | { |
ee959b00 | 1938 | struct scsi_disk *sdkp = to_scsi_disk(dev); |
1da177e4 LT |
1939 | struct gendisk *disk = sdkp->disk; |
1940 | ||
f27bac27 | 1941 | ida_remove(&sd_index_ida, sdkp->index); |
1da177e4 LT |
1942 | |
1943 | disk->private_data = NULL; | |
1da177e4 | 1944 | put_disk(disk); |
39b7f1e2 | 1945 | put_device(&sdkp->device->sdev_gendev); |
1da177e4 LT |
1946 | |
1947 | kfree(sdkp); | |
1948 | } | |
1949 | ||
cc5d2c8c | 1950 | static int sd_start_stop_device(struct scsi_disk *sdkp, int start) |
c3c94c5a TH |
1951 | { |
1952 | unsigned char cmd[6] = { START_STOP }; /* START_VALID */ | |
1953 | struct scsi_sense_hdr sshdr; | |
cc5d2c8c | 1954 | struct scsi_device *sdp = sdkp->device; |
c3c94c5a TH |
1955 | int res; |
1956 | ||
1957 | if (start) | |
1958 | cmd[4] |= 1; /* START */ | |
1959 | ||
d2886ea3 SR |
1960 | if (sdp->start_stop_pwr_cond) |
1961 | cmd[4] |= start ? 1 << 4 : 3 << 4; /* Active or Standby */ | |
1962 | ||
c3c94c5a TH |
1963 | if (!scsi_device_online(sdp)) |
1964 | return -ENODEV; | |
1965 | ||
1966 | res = scsi_execute_req(sdp, cmd, DMA_NONE, NULL, 0, &sshdr, | |
1967 | SD_TIMEOUT, SD_MAX_RETRIES); | |
1968 | if (res) { | |
cc5d2c8c JB |
1969 | sd_printk(KERN_WARNING, sdkp, "START_STOP FAILED\n"); |
1970 | sd_print_result(sdkp, res); | |
c3c94c5a | 1971 | if (driver_byte(res) & DRIVER_SENSE) |
cc5d2c8c | 1972 | sd_print_sense_hdr(sdkp, &sshdr); |
c3c94c5a TH |
1973 | } |
1974 | ||
1975 | return res; | |
1976 | } | |
1977 | ||
1da177e4 LT |
1978 | /* |
1979 | * Send a SYNCHRONIZE CACHE instruction down to the device through | |
1980 | * the normal SCSI command structure. Wait for the command to | |
1981 | * complete. | |
1982 | */ | |
1983 | static void sd_shutdown(struct device *dev) | |
1984 | { | |
39b7f1e2 | 1985 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
1da177e4 LT |
1986 | |
1987 | if (!sdkp) | |
1988 | return; /* this can happen */ | |
1989 | ||
39b7f1e2 | 1990 | if (sdkp->WCE) { |
e73aec82 MP |
1991 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
1992 | sd_sync_cache(sdkp); | |
39b7f1e2 | 1993 | } |
c3c94c5a | 1994 | |
cc5d2c8c JB |
1995 | if (system_state != SYSTEM_RESTART && sdkp->device->manage_start_stop) { |
1996 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); | |
1997 | sd_start_stop_device(sdkp, 0); | |
c3c94c5a TH |
1998 | } |
1999 | ||
39b7f1e2 AS |
2000 | scsi_disk_put(sdkp); |
2001 | } | |
1da177e4 | 2002 | |
c3c94c5a TH |
2003 | static int sd_suspend(struct device *dev, pm_message_t mesg) |
2004 | { | |
c3c94c5a | 2005 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
09ff92fe | 2006 | int ret = 0; |
c3c94c5a TH |
2007 | |
2008 | if (!sdkp) | |
2009 | return 0; /* this can happen */ | |
2010 | ||
2011 | if (sdkp->WCE) { | |
cc5d2c8c | 2012 | sd_printk(KERN_NOTICE, sdkp, "Synchronizing SCSI cache\n"); |
c3c94c5a TH |
2013 | ret = sd_sync_cache(sdkp); |
2014 | if (ret) | |
09ff92fe | 2015 | goto done; |
c3c94c5a TH |
2016 | } |
2017 | ||
3a2d5b70 | 2018 | if ((mesg.event & PM_EVENT_SLEEP) && sdkp->device->manage_start_stop) { |
cc5d2c8c JB |
2019 | sd_printk(KERN_NOTICE, sdkp, "Stopping disk\n"); |
2020 | ret = sd_start_stop_device(sdkp, 0); | |
c3c94c5a TH |
2021 | } |
2022 | ||
09ff92fe AS |
2023 | done: |
2024 | scsi_disk_put(sdkp); | |
2025 | return ret; | |
c3c94c5a TH |
2026 | } |
2027 | ||
2028 | static int sd_resume(struct device *dev) | |
2029 | { | |
c3c94c5a | 2030 | struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev); |
09ff92fe | 2031 | int ret = 0; |
c3c94c5a | 2032 | |
cc5d2c8c | 2033 | if (!sdkp->device->manage_start_stop) |
09ff92fe | 2034 | goto done; |
c3c94c5a | 2035 | |
cc5d2c8c | 2036 | sd_printk(KERN_NOTICE, sdkp, "Starting disk\n"); |
09ff92fe | 2037 | ret = sd_start_stop_device(sdkp, 1); |
c3c94c5a | 2038 | |
09ff92fe AS |
2039 | done: |
2040 | scsi_disk_put(sdkp); | |
2041 | return ret; | |
c3c94c5a TH |
2042 | } |
2043 | ||
1da177e4 LT |
2044 | /** |
2045 | * init_sd - entry point for this driver (both when built in or when | |
2046 | * a module). | |
2047 | * | |
2048 | * Note: this function registers this driver with the scsi mid-level. | |
2049 | **/ | |
2050 | static int __init init_sd(void) | |
2051 | { | |
5e4009ba | 2052 | int majors = 0, i, err; |
1da177e4 LT |
2053 | |
2054 | SCSI_LOG_HLQUEUE(3, printk("init_sd: sd driver entry point\n")); | |
2055 | ||
2056 | for (i = 0; i < SD_MAJORS; i++) | |
2057 | if (register_blkdev(sd_major(i), "sd") == 0) | |
2058 | majors++; | |
2059 | ||
2060 | if (!majors) | |
2061 | return -ENODEV; | |
2062 | ||
5e4009ba JG |
2063 | err = class_register(&sd_disk_class); |
2064 | if (err) | |
2065 | goto err_out; | |
6bdaa1f1 | 2066 | |
5e4009ba JG |
2067 | err = scsi_register_driver(&sd_template.gendrv); |
2068 | if (err) | |
2069 | goto err_out_class; | |
2070 | ||
2071 | return 0; | |
2072 | ||
2073 | err_out_class: | |
2074 | class_unregister(&sd_disk_class); | |
2075 | err_out: | |
2076 | for (i = 0; i < SD_MAJORS; i++) | |
2077 | unregister_blkdev(sd_major(i), "sd"); | |
2078 | return err; | |
1da177e4 LT |
2079 | } |
2080 | ||
2081 | /** | |
2082 | * exit_sd - exit point for this driver (when it is a module). | |
2083 | * | |
2084 | * Note: this function unregisters this driver from the scsi mid-level. | |
2085 | **/ | |
2086 | static void __exit exit_sd(void) | |
2087 | { | |
2088 | int i; | |
2089 | ||
2090 | SCSI_LOG_HLQUEUE(3, printk("exit_sd: exiting sd driver\n")); | |
2091 | ||
2092 | scsi_unregister_driver(&sd_template.gendrv); | |
5e4009ba JG |
2093 | class_unregister(&sd_disk_class); |
2094 | ||
1da177e4 LT |
2095 | for (i = 0; i < SD_MAJORS; i++) |
2096 | unregister_blkdev(sd_major(i), "sd"); | |
2097 | } | |
2098 | ||
1da177e4 LT |
2099 | module_init(init_sd); |
2100 | module_exit(exit_sd); | |
e73aec82 MP |
2101 | |
2102 | static void sd_print_sense_hdr(struct scsi_disk *sdkp, | |
2103 | struct scsi_sense_hdr *sshdr) | |
2104 | { | |
2105 | sd_printk(KERN_INFO, sdkp, ""); | |
2106 | scsi_show_sense_hdr(sshdr); | |
2107 | sd_printk(KERN_INFO, sdkp, ""); | |
2108 | scsi_show_extd_sense(sshdr->asc, sshdr->ascq); | |
2109 | } | |
2110 | ||
2111 | static void sd_print_result(struct scsi_disk *sdkp, int result) | |
2112 | { | |
2113 | sd_printk(KERN_INFO, sdkp, ""); | |
2114 | scsi_show_result(result); | |
2115 | } | |
2116 |