Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * sr.c Copyright (C) 1992 David Giller | |
3 | * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale | |
4 | * | |
5 | * adapted from: | |
6 | * sd.c Copyright (C) 1992 Drew Eckhardt | |
7 | * Linux scsi disk driver by | |
8 | * Drew Eckhardt <drew@colorado.edu> | |
9 | * | |
10 | * Modified by Eric Youngdale ericy@andante.org to | |
11 | * add scatter-gather, multiple outstanding request, and other | |
12 | * enhancements. | |
13 | * | |
14 | * Modified by Eric Youngdale eric@andante.org to support loadable | |
15 | * low-level scsi drivers. | |
16 | * | |
17 | * Modified by Thomas Quinot thomas@melchior.cuivre.fdn.fr to | |
18 | * provide auto-eject. | |
19 | * | |
20 | * Modified by Gerd Knorr <kraxel@cs.tu-berlin.de> to support the | |
21 | * generic cdrom interface | |
22 | * | |
23 | * Modified by Jens Axboe <axboe@suse.de> - Uniform sr_packet() | |
24 | * interface, capabilities probe additions, ioctl cleanups, etc. | |
25 | * | |
26 | * Modified by Richard Gooch <rgooch@atnf.csiro.au> to support devfs | |
27 | * | |
28 | * Modified by Jens Axboe <axboe@suse.de> - support DVD-RAM | |
29 | * transparently and lose the GHOST hack | |
30 | * | |
31 | * Modified by Arnaldo Carvalho de Melo <acme@conectiva.com.br> | |
32 | * check resource allocation in sr_init and some cleanups | |
33 | */ | |
34 | ||
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/string.h> | |
41 | #include <linux/errno.h> | |
42 | #include <linux/cdrom.h> | |
43 | #include <linux/interrupt.h> | |
44 | #include <linux/init.h> | |
45 | #include <linux/blkdev.h> | |
0b950672 | 46 | #include <linux/mutex.h> |
5a0e3ad6 | 47 | #include <linux/slab.h> |
1da177e4 LT |
48 | #include <asm/uaccess.h> |
49 | ||
50 | #include <scsi/scsi.h> | |
51 | #include <scsi/scsi_dbg.h> | |
52 | #include <scsi/scsi_device.h> | |
53 | #include <scsi/scsi_driver.h> | |
820732b5 | 54 | #include <scsi/scsi_cmnd.h> |
1da177e4 LT |
55 | #include <scsi/scsi_eh.h> |
56 | #include <scsi/scsi_host.h> | |
57 | #include <scsi/scsi_ioctl.h> /* For the door lock/unlock commands */ | |
1da177e4 LT |
58 | |
59 | #include "scsi_logging.h" | |
60 | #include "sr.h" | |
61 | ||
62 | ||
f018fa55 RH |
63 | MODULE_DESCRIPTION("SCSI cdrom (sr) driver"); |
64 | MODULE_LICENSE("GPL"); | |
65 | MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR); | |
d7b8bcb0 MT |
66 | MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM); |
67 | MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM); | |
f018fa55 | 68 | |
1da177e4 LT |
69 | #define SR_DISKS 256 |
70 | ||
1da177e4 LT |
71 | #define SR_CAPABILITIES \ |
72 | (CDC_CLOSE_TRAY|CDC_OPEN_TRAY|CDC_LOCK|CDC_SELECT_SPEED| \ | |
73 | CDC_SELECT_DISC|CDC_MULTI_SESSION|CDC_MCN|CDC_MEDIA_CHANGED| \ | |
6a2900b6 | 74 | CDC_PLAY_AUDIO|CDC_RESET|CDC_DRIVE_STATUS| \ |
1da177e4 LT |
75 | CDC_CD_R|CDC_CD_RW|CDC_DVD|CDC_DVD_R|CDC_DVD_RAM|CDC_GENERIC_PACKET| \ |
76 | CDC_MRW|CDC_MRW_W|CDC_RAM) | |
77 | ||
2a48fc0a | 78 | static DEFINE_MUTEX(sr_mutex); |
1da177e4 LT |
79 | static int sr_probe(struct device *); |
80 | static int sr_remove(struct device *); | |
7b3d9545 | 81 | static int sr_done(struct scsi_cmnd *); |
1da177e4 LT |
82 | |
83 | static struct scsi_driver sr_template = { | |
84 | .owner = THIS_MODULE, | |
85 | .gendrv = { | |
86 | .name = "sr", | |
87 | .probe = sr_probe, | |
88 | .remove = sr_remove, | |
89 | }, | |
7b3d9545 | 90 | .done = sr_done, |
1da177e4 LT |
91 | }; |
92 | ||
93 | static unsigned long sr_index_bits[SR_DISKS / BITS_PER_LONG]; | |
94 | static DEFINE_SPINLOCK(sr_index_lock); | |
95 | ||
96 | /* This semaphore is used to mediate the 0->1 reference get in the | |
97 | * face of object destruction (i.e. we can't allow a get on an | |
98 | * object after last put) */ | |
0b950672 | 99 | static DEFINE_MUTEX(sr_ref_mutex); |
1da177e4 LT |
100 | |
101 | static int sr_open(struct cdrom_device_info *, int); | |
102 | static void sr_release(struct cdrom_device_info *); | |
103 | ||
104 | static void get_sectorsize(struct scsi_cd *); | |
105 | static void get_capabilities(struct scsi_cd *); | |
106 | ||
107 | static int sr_media_change(struct cdrom_device_info *, int); | |
108 | static int sr_packet(struct cdrom_device_info *, struct packet_command *); | |
109 | ||
110 | static struct cdrom_device_ops sr_dops = { | |
111 | .open = sr_open, | |
112 | .release = sr_release, | |
113 | .drive_status = sr_drive_status, | |
114 | .media_changed = sr_media_change, | |
115 | .tray_move = sr_tray_move, | |
116 | .lock_door = sr_lock_door, | |
117 | .select_speed = sr_select_speed, | |
118 | .get_last_session = sr_get_last_session, | |
119 | .get_mcn = sr_get_mcn, | |
120 | .reset = sr_reset, | |
121 | .audio_ioctl = sr_audio_ioctl, | |
1da177e4 LT |
122 | .capability = SR_CAPABILITIES, |
123 | .generic_packet = sr_packet, | |
124 | }; | |
125 | ||
126 | static void sr_kref_release(struct kref *kref); | |
127 | ||
128 | static inline struct scsi_cd *scsi_cd(struct gendisk *disk) | |
129 | { | |
130 | return container_of(disk->private_data, struct scsi_cd, driver); | |
131 | } | |
132 | ||
133 | /* | |
134 | * The get and put routines for the struct scsi_cd. Note this entity | |
135 | * has a scsi_device pointer and owns a reference to this. | |
136 | */ | |
137 | static inline struct scsi_cd *scsi_cd_get(struct gendisk *disk) | |
138 | { | |
139 | struct scsi_cd *cd = NULL; | |
140 | ||
0b950672 | 141 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
142 | if (disk->private_data == NULL) |
143 | goto out; | |
144 | cd = scsi_cd(disk); | |
145 | kref_get(&cd->kref); | |
146 | if (scsi_device_get(cd->device)) | |
147 | goto out_put; | |
148 | goto out; | |
149 | ||
150 | out_put: | |
151 | kref_put(&cd->kref, sr_kref_release); | |
152 | cd = NULL; | |
153 | out: | |
0b950672 | 154 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
155 | return cd; |
156 | } | |
157 | ||
858119e1 | 158 | static void scsi_cd_put(struct scsi_cd *cd) |
1da177e4 LT |
159 | { |
160 | struct scsi_device *sdev = cd->device; | |
161 | ||
0b950672 | 162 | mutex_lock(&sr_ref_mutex); |
1da177e4 LT |
163 | kref_put(&cd->kref, sr_kref_release); |
164 | scsi_device_put(sdev); | |
0b950672 | 165 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
166 | } |
167 | ||
38582a62 JB |
168 | /* identical to scsi_test_unit_ready except that it doesn't |
169 | * eat the NOT_READY returns for removable media */ | |
170 | int sr_test_unit_ready(struct scsi_device *sdev, struct scsi_sense_hdr *sshdr) | |
171 | { | |
172 | int retries = MAX_RETRIES; | |
173 | int the_result; | |
174 | u8 cmd[] = {TEST_UNIT_READY, 0, 0, 0, 0, 0 }; | |
175 | ||
176 | /* issue TEST_UNIT_READY until the initial startup UNIT_ATTENTION | |
177 | * conditions are gone, or a timeout happens | |
178 | */ | |
179 | do { | |
180 | the_result = scsi_execute_req(sdev, cmd, DMA_NONE, NULL, | |
181 | 0, sshdr, SR_TIMEOUT, | |
f4f4e47e | 182 | retries--, NULL); |
d1daeabf JB |
183 | if (scsi_sense_valid(sshdr) && |
184 | sshdr->sense_key == UNIT_ATTENTION) | |
185 | sdev->changed = 1; | |
38582a62 JB |
186 | |
187 | } while (retries > 0 && | |
188 | (!scsi_status_is_good(the_result) || | |
189 | (scsi_sense_valid(sshdr) && | |
190 | sshdr->sense_key == UNIT_ATTENTION))); | |
191 | return the_result; | |
192 | } | |
193 | ||
1da177e4 LT |
194 | /* |
195 | * This function checks to see if the media has been changed in the | |
196 | * CDROM drive. It is possible that we have already sensed a change, | |
197 | * or the drive may have sensed one and not yet reported it. We must | |
198 | * be ready for either case. This function always reports the current | |
199 | * value of the changed bit. If flag is 0, then the changed bit is reset. | |
200 | * This function could be done as an ioctl, but we would need to have | |
201 | * an inode for that to work, and we do not always have one. | |
202 | */ | |
203 | ||
44818efb | 204 | static int sr_media_change(struct cdrom_device_info *cdi, int slot) |
1da177e4 LT |
205 | { |
206 | struct scsi_cd *cd = cdi->handle; | |
207 | int retval; | |
001aac25 | 208 | struct scsi_sense_hdr *sshdr; |
1da177e4 LT |
209 | |
210 | if (CDSL_CURRENT != slot) { | |
211 | /* no changer support */ | |
212 | return -EINVAL; | |
213 | } | |
214 | ||
001aac25 | 215 | sshdr = kzalloc(sizeof(*sshdr), GFP_KERNEL); |
38582a62 | 216 | retval = sr_test_unit_ready(cd->device, sshdr); |
001aac25 JB |
217 | if (retval || (scsi_sense_valid(sshdr) && |
218 | /* 0x3a is medium not present */ | |
219 | sshdr->asc == 0x3a)) { | |
220 | /* Media not present or unable to test, unit probably not | |
221 | * ready. This usually means there is no disc in the drive. | |
222 | * Mark as changed, and we will figure it out later once | |
223 | * the drive is available again. | |
224 | */ | |
1da177e4 | 225 | cd->device->changed = 1; |
285e9670 KS |
226 | /* This will force a flush, if called from check_disk_change */ |
227 | retval = 1; | |
228 | goto out; | |
1da177e4 LT |
229 | }; |
230 | ||
231 | retval = cd->device->changed; | |
232 | cd->device->changed = 0; | |
233 | /* If the disk changed, the capacity will now be different, | |
234 | * so we force a re-read of this information */ | |
235 | if (retval) { | |
236 | /* check multisession offset etc */ | |
237 | sr_cd_check(cdi); | |
51490c89 | 238 | get_sectorsize(cd); |
1da177e4 | 239 | } |
285e9670 KS |
240 | |
241 | out: | |
242 | /* Notify userspace, that media has changed. */ | |
243 | if (retval != cd->previous_state) | |
244 | sdev_evt_send_simple(cd->device, SDEV_EVT_MEDIA_CHANGE, | |
245 | GFP_KERNEL); | |
246 | cd->previous_state = retval; | |
001aac25 | 247 | kfree(sshdr); |
285e9670 | 248 | |
1da177e4 LT |
249 | return retval; |
250 | } | |
251 | ||
252 | /* | |
7b3d9545 | 253 | * sr_done is the interrupt routine for the device driver. |
1da177e4 | 254 | * |
7b3d9545 | 255 | * It will be notified on the end of a SCSI read / write, and will take one |
1da177e4 LT |
256 | * of several actions based on success or failure. |
257 | */ | |
7b3d9545 | 258 | static int sr_done(struct scsi_cmnd *SCpnt) |
1da177e4 LT |
259 | { |
260 | int result = SCpnt->result; | |
30b0c37b | 261 | int this_count = scsi_bufflen(SCpnt); |
1da177e4 LT |
262 | int good_bytes = (result == 0 ? this_count : 0); |
263 | int block_sectors = 0; | |
264 | long error_sector; | |
265 | struct scsi_cd *cd = scsi_cd(SCpnt->request->rq_disk); | |
266 | ||
267 | #ifdef DEBUG | |
268 | printk("sr.c done: %x\n", result); | |
269 | #endif | |
270 | ||
271 | /* | |
272 | * Handle MEDIUM ERRORs or VOLUME OVERFLOWs that indicate partial | |
273 | * success. Since this is a relatively rare error condition, no | |
274 | * care is taken to avoid unnecessary additional work such as | |
275 | * memcpy's that could be avoided. | |
276 | */ | |
277 | if (driver_byte(result) != 0 && /* An error occurred */ | |
278 | (SCpnt->sense_buffer[0] & 0x7f) == 0x70) { /* Sense current */ | |
279 | switch (SCpnt->sense_buffer[2]) { | |
280 | case MEDIUM_ERROR: | |
281 | case VOLUME_OVERFLOW: | |
282 | case ILLEGAL_REQUEST: | |
283 | if (!(SCpnt->sense_buffer[0] & 0x90)) | |
284 | break; | |
1da177e4 LT |
285 | error_sector = (SCpnt->sense_buffer[3] << 24) | |
286 | (SCpnt->sense_buffer[4] << 16) | | |
287 | (SCpnt->sense_buffer[5] << 8) | | |
288 | SCpnt->sense_buffer[6]; | |
289 | if (SCpnt->request->bio != NULL) | |
290 | block_sectors = | |
291 | bio_sectors(SCpnt->request->bio); | |
292 | if (block_sectors < 4) | |
293 | block_sectors = 4; | |
294 | if (cd->device->sector_size == 2048) | |
295 | error_sector <<= 2; | |
296 | error_sector &= ~(block_sectors - 1); | |
83096ebf TH |
297 | good_bytes = (error_sector - |
298 | blk_rq_pos(SCpnt->request)) << 9; | |
1da177e4 LT |
299 | if (good_bytes < 0 || good_bytes >= this_count) |
300 | good_bytes = 0; | |
301 | /* | |
302 | * The SCSI specification allows for the value | |
303 | * returned by READ CAPACITY to be up to 75 2K | |
304 | * sectors past the last readable block. | |
305 | * Therefore, if we hit a medium error within the | |
306 | * last 75 2K sectors, we decrease the saved size | |
307 | * value. | |
308 | */ | |
309 | if (error_sector < get_capacity(cd->disk) && | |
310 | cd->capacity - error_sector < 4 * 75) | |
311 | set_capacity(cd->disk, error_sector); | |
312 | break; | |
313 | ||
314 | case RECOVERED_ERROR: | |
1da177e4 LT |
315 | good_bytes = this_count; |
316 | break; | |
317 | ||
318 | default: | |
319 | break; | |
320 | } | |
321 | } | |
322 | ||
7b3d9545 | 323 | return good_bytes; |
1da177e4 LT |
324 | } |
325 | ||
7f9a6bc4 | 326 | static int sr_prep_fn(struct request_queue *q, struct request *rq) |
1da177e4 | 327 | { |
242f9dcb | 328 | int block = 0, this_count, s_size; |
7f9a6bc4 JB |
329 | struct scsi_cd *cd; |
330 | struct scsi_cmnd *SCpnt; | |
331 | struct scsi_device *sdp = q->queuedata; | |
332 | int ret; | |
333 | ||
334 | if (rq->cmd_type == REQ_TYPE_BLOCK_PC) { | |
335 | ret = scsi_setup_blk_pc_cmnd(sdp, rq); | |
336 | goto out; | |
337 | } else if (rq->cmd_type != REQ_TYPE_FS) { | |
338 | ret = BLKPREP_KILL; | |
339 | goto out; | |
340 | } | |
341 | ret = scsi_setup_fs_cmnd(sdp, rq); | |
342 | if (ret != BLKPREP_OK) | |
343 | goto out; | |
344 | SCpnt = rq->special; | |
345 | cd = scsi_cd(rq->rq_disk); | |
346 | ||
347 | /* from here on until we're complete, any goto out | |
348 | * is used for a killable error condition */ | |
349 | ret = BLKPREP_KILL; | |
1da177e4 LT |
350 | |
351 | SCSI_LOG_HLQUEUE(1, printk("Doing sr request, dev = %s, block = %d\n", | |
352 | cd->disk->disk_name, block)); | |
353 | ||
354 | if (!cd->device || !scsi_device_online(cd->device)) { | |
83096ebf TH |
355 | SCSI_LOG_HLQUEUE(2, printk("Finishing %u sectors\n", |
356 | blk_rq_sectors(rq))); | |
1da177e4 | 357 | SCSI_LOG_HLQUEUE(2, printk("Retry with 0x%p\n", SCpnt)); |
7f9a6bc4 | 358 | goto out; |
1da177e4 LT |
359 | } |
360 | ||
361 | if (cd->device->changed) { | |
362 | /* | |
363 | * quietly refuse to do anything to a changed disc until the | |
364 | * changed bit has been reset | |
365 | */ | |
7f9a6bc4 | 366 | goto out; |
1da177e4 LT |
367 | } |
368 | ||
1da177e4 LT |
369 | /* |
370 | * we do lazy blocksize switching (when reading XA sectors, | |
371 | * see CDROMREADMODE2 ioctl) | |
372 | */ | |
373 | s_size = cd->device->sector_size; | |
374 | if (s_size > 2048) { | |
375 | if (!in_interrupt()) | |
376 | sr_set_blocklength(cd, 2048); | |
377 | else | |
378 | printk("sr: can't switch blocksize: in interrupt\n"); | |
379 | } | |
380 | ||
381 | if (s_size != 512 && s_size != 1024 && s_size != 2048) { | |
3bf743e7 | 382 | scmd_printk(KERN_ERR, SCpnt, "bad sector size %d\n", s_size); |
7f9a6bc4 | 383 | goto out; |
1da177e4 LT |
384 | } |
385 | ||
7f9a6bc4 | 386 | if (rq_data_dir(rq) == WRITE) { |
1da177e4 | 387 | if (!cd->device->writeable) |
7f9a6bc4 | 388 | goto out; |
1da177e4 LT |
389 | SCpnt->cmnd[0] = WRITE_10; |
390 | SCpnt->sc_data_direction = DMA_TO_DEVICE; | |
391 | cd->cdi.media_written = 1; | |
7f9a6bc4 | 392 | } else if (rq_data_dir(rq) == READ) { |
1da177e4 LT |
393 | SCpnt->cmnd[0] = READ_10; |
394 | SCpnt->sc_data_direction = DMA_FROM_DEVICE; | |
395 | } else { | |
7f9a6bc4 JB |
396 | blk_dump_rq_flags(rq, "Unknown sr command"); |
397 | goto out; | |
1da177e4 LT |
398 | } |
399 | ||
400 | { | |
30b0c37b BH |
401 | struct scatterlist *sg; |
402 | int i, size = 0, sg_count = scsi_sg_count(SCpnt); | |
1da177e4 | 403 | |
30b0c37b BH |
404 | scsi_for_each_sg(SCpnt, sg, sg_count, i) |
405 | size += sg->length; | |
406 | ||
407 | if (size != scsi_bufflen(SCpnt)) { | |
3bf743e7 JG |
408 | scmd_printk(KERN_ERR, SCpnt, |
409 | "mismatch count %d, bytes %d\n", | |
30b0c37b BH |
410 | size, scsi_bufflen(SCpnt)); |
411 | if (scsi_bufflen(SCpnt) > size) | |
412 | SCpnt->sdb.length = size; | |
1da177e4 LT |
413 | } |
414 | } | |
415 | ||
416 | /* | |
417 | * request doesn't start on hw block boundary, add scatter pads | |
418 | */ | |
83096ebf | 419 | if (((unsigned int)blk_rq_pos(rq) % (s_size >> 9)) || |
30b0c37b | 420 | (scsi_bufflen(SCpnt) % s_size)) { |
3bf743e7 | 421 | scmd_printk(KERN_NOTICE, SCpnt, "unaligned transfer\n"); |
7f9a6bc4 | 422 | goto out; |
1da177e4 LT |
423 | } |
424 | ||
30b0c37b | 425 | this_count = (scsi_bufflen(SCpnt) >> 9) / (s_size >> 9); |
1da177e4 LT |
426 | |
427 | ||
83096ebf | 428 | SCSI_LOG_HLQUEUE(2, printk("%s : %s %d/%u 512 byte blocks.\n", |
1da177e4 | 429 | cd->cdi.name, |
7f9a6bc4 | 430 | (rq_data_dir(rq) == WRITE) ? |
1da177e4 | 431 | "writing" : "reading", |
83096ebf | 432 | this_count, blk_rq_sectors(rq))); |
1da177e4 LT |
433 | |
434 | SCpnt->cmnd[1] = 0; | |
83096ebf | 435 | block = (unsigned int)blk_rq_pos(rq) / (s_size >> 9); |
1da177e4 LT |
436 | |
437 | if (this_count > 0xffff) { | |
438 | this_count = 0xffff; | |
30b0c37b | 439 | SCpnt->sdb.length = this_count * s_size; |
1da177e4 LT |
440 | } |
441 | ||
442 | SCpnt->cmnd[2] = (unsigned char) (block >> 24) & 0xff; | |
443 | SCpnt->cmnd[3] = (unsigned char) (block >> 16) & 0xff; | |
444 | SCpnt->cmnd[4] = (unsigned char) (block >> 8) & 0xff; | |
445 | SCpnt->cmnd[5] = (unsigned char) block & 0xff; | |
446 | SCpnt->cmnd[6] = SCpnt->cmnd[9] = 0; | |
447 | SCpnt->cmnd[7] = (unsigned char) (this_count >> 8) & 0xff; | |
448 | SCpnt->cmnd[8] = (unsigned char) this_count & 0xff; | |
449 | ||
450 | /* | |
451 | * We shouldn't disconnect in the middle of a sector, so with a dumb | |
452 | * host adapter, it's safe to assume that we can at least transfer | |
453 | * this many bytes between each connect / disconnect. | |
454 | */ | |
455 | SCpnt->transfersize = cd->device->sector_size; | |
456 | SCpnt->underflow = this_count << 9; | |
1da177e4 | 457 | SCpnt->allowed = MAX_RETRIES; |
1da177e4 | 458 | |
1da177e4 LT |
459 | /* |
460 | * This indicates that the command is ready from our end to be | |
461 | * queued. | |
462 | */ | |
7f9a6bc4 JB |
463 | ret = BLKPREP_OK; |
464 | out: | |
465 | return scsi_prep_return(q, rq, ret); | |
1da177e4 LT |
466 | } |
467 | ||
40cc51be | 468 | static int sr_block_open(struct block_device *bdev, fmode_t mode) |
1da177e4 | 469 | { |
6e9624b8 | 470 | struct scsi_cd *cd; |
40cc51be | 471 | int ret = -ENXIO; |
1da177e4 | 472 | |
2a48fc0a | 473 | mutex_lock(&sr_mutex); |
6e9624b8 | 474 | cd = scsi_cd_get(bdev->bd_disk); |
40cc51be AV |
475 | if (cd) { |
476 | ret = cdrom_open(&cd->cdi, bdev, mode); | |
477 | if (ret) | |
478 | scsi_cd_put(cd); | |
479 | } | |
2a48fc0a | 480 | mutex_unlock(&sr_mutex); |
1da177e4 LT |
481 | return ret; |
482 | } | |
483 | ||
40cc51be | 484 | static int sr_block_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 485 | { |
40cc51be | 486 | struct scsi_cd *cd = scsi_cd(disk); |
2a48fc0a | 487 | mutex_lock(&sr_mutex); |
40cc51be | 488 | cdrom_release(&cd->cdi, mode); |
1da177e4 | 489 | scsi_cd_put(cd); |
2a48fc0a | 490 | mutex_unlock(&sr_mutex); |
1da177e4 LT |
491 | return 0; |
492 | } | |
493 | ||
40cc51be | 494 | static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, |
1da177e4 LT |
495 | unsigned long arg) |
496 | { | |
40cc51be | 497 | struct scsi_cd *cd = scsi_cd(bdev->bd_disk); |
1da177e4 | 498 | struct scsi_device *sdev = cd->device; |
6a2900b6 CH |
499 | void __user *argp = (void __user *)arg; |
500 | int ret; | |
1da177e4 | 501 | |
2a48fc0a | 502 | mutex_lock(&sr_mutex); |
8a6cfeb6 | 503 | |
6a2900b6 CH |
504 | /* |
505 | * Send SCSI addressing ioctls directly to mid level, send other | |
506 | * ioctls to cdrom/block level. | |
507 | */ | |
508 | switch (cmd) { | |
509 | case SCSI_IOCTL_GET_IDLUN: | |
510 | case SCSI_IOCTL_GET_BUS_NUMBER: | |
8a6cfeb6 AB |
511 | ret = scsi_ioctl(sdev, cmd, argp); |
512 | goto out; | |
1da177e4 | 513 | } |
6a2900b6 | 514 | |
40cc51be | 515 | ret = cdrom_ioctl(&cd->cdi, bdev, mode, cmd, arg); |
6397256b | 516 | if (ret != -ENOSYS) |
8a6cfeb6 | 517 | goto out; |
6a2900b6 CH |
518 | |
519 | /* | |
520 | * ENODEV means that we didn't recognise the ioctl, or that we | |
521 | * cannot execute it in the current device state. In either | |
522 | * case fall through to scsi_ioctl, which will return ENDOEV again | |
523 | * if it doesn't recognise the ioctl | |
524 | */ | |
83ff6fe8 | 525 | ret = scsi_nonblockable_ioctl(sdev, cmd, argp, |
fd4ce1ac | 526 | (mode & FMODE_NDELAY) != 0); |
6a2900b6 | 527 | if (ret != -ENODEV) |
8a6cfeb6 AB |
528 | goto out; |
529 | ret = scsi_ioctl(sdev, cmd, argp); | |
530 | ||
531 | out: | |
2a48fc0a | 532 | mutex_unlock(&sr_mutex); |
8a6cfeb6 | 533 | return ret; |
1da177e4 LT |
534 | } |
535 | ||
536 | static int sr_block_media_changed(struct gendisk *disk) | |
537 | { | |
538 | struct scsi_cd *cd = scsi_cd(disk); | |
539 | return cdrom_media_changed(&cd->cdi); | |
540 | } | |
541 | ||
83d5cde4 | 542 | static const struct block_device_operations sr_bdops = |
1da177e4 LT |
543 | { |
544 | .owner = THIS_MODULE, | |
40cc51be AV |
545 | .open = sr_block_open, |
546 | .release = sr_block_release, | |
8a6cfeb6 | 547 | .ioctl = sr_block_ioctl, |
1da177e4 LT |
548 | .media_changed = sr_block_media_changed, |
549 | /* | |
550 | * No compat_ioctl for now because sr_block_ioctl never | |
551 | * seems to pass arbitary ioctls down to host drivers. | |
552 | */ | |
553 | }; | |
554 | ||
555 | static int sr_open(struct cdrom_device_info *cdi, int purpose) | |
556 | { | |
557 | struct scsi_cd *cd = cdi->handle; | |
558 | struct scsi_device *sdev = cd->device; | |
559 | int retval; | |
560 | ||
561 | /* | |
562 | * If the device is in error recovery, wait until it is done. | |
563 | * If the device is offline, then disallow any access to it. | |
564 | */ | |
565 | retval = -ENXIO; | |
566 | if (!scsi_block_when_processing_errors(sdev)) | |
567 | goto error_out; | |
568 | ||
1da177e4 LT |
569 | return 0; |
570 | ||
571 | error_out: | |
572 | return retval; | |
573 | } | |
574 | ||
575 | static void sr_release(struct cdrom_device_info *cdi) | |
576 | { | |
577 | struct scsi_cd *cd = cdi->handle; | |
578 | ||
579 | if (cd->device->sector_size > 2048) | |
580 | sr_set_blocklength(cd, 2048); | |
581 | ||
582 | } | |
583 | ||
584 | static int sr_probe(struct device *dev) | |
585 | { | |
586 | struct scsi_device *sdev = to_scsi_device(dev); | |
587 | struct gendisk *disk; | |
588 | struct scsi_cd *cd; | |
589 | int minor, error; | |
590 | ||
591 | error = -ENODEV; | |
592 | if (sdev->type != TYPE_ROM && sdev->type != TYPE_WORM) | |
593 | goto fail; | |
594 | ||
595 | error = -ENOMEM; | |
24669f75 | 596 | cd = kzalloc(sizeof(*cd), GFP_KERNEL); |
1da177e4 LT |
597 | if (!cd) |
598 | goto fail; | |
1da177e4 LT |
599 | |
600 | kref_init(&cd->kref); | |
601 | ||
602 | disk = alloc_disk(1); | |
603 | if (!disk) | |
604 | goto fail_free; | |
605 | ||
606 | spin_lock(&sr_index_lock); | |
607 | minor = find_first_zero_bit(sr_index_bits, SR_DISKS); | |
608 | if (minor == SR_DISKS) { | |
609 | spin_unlock(&sr_index_lock); | |
610 | error = -EBUSY; | |
611 | goto fail_put; | |
612 | } | |
613 | __set_bit(minor, sr_index_bits); | |
614 | spin_unlock(&sr_index_lock); | |
615 | ||
616 | disk->major = SCSI_CDROM_MAJOR; | |
617 | disk->first_minor = minor; | |
618 | sprintf(disk->disk_name, "sr%d", minor); | |
619 | disk->fops = &sr_bdops; | |
620 | disk->flags = GENHD_FL_CD; | |
621 | ||
242f9dcb JA |
622 | blk_queue_rq_timeout(sdev->request_queue, SR_TIMEOUT); |
623 | ||
1da177e4 LT |
624 | cd->device = sdev; |
625 | cd->disk = disk; | |
626 | cd->driver = &sr_template; | |
627 | cd->disk = disk; | |
628 | cd->capacity = 0x1fffff; | |
1da177e4 | 629 | cd->device->changed = 1; /* force recheck CD type */ |
c02e6002 | 630 | cd->previous_state = 1; |
1da177e4 LT |
631 | cd->use = 1; |
632 | cd->readcd_known = 0; | |
633 | cd->readcd_cdda = 0; | |
634 | ||
635 | cd->cdi.ops = &sr_dops; | |
636 | cd->cdi.handle = cd; | |
637 | cd->cdi.mask = 0; | |
638 | cd->cdi.capacity = 1; | |
639 | sprintf(cd->cdi.name, "sr%d", minor); | |
640 | ||
641 | sdev->sector_size = 2048; /* A guess, just in case */ | |
642 | ||
643 | /* FIXME: need to handle a get_capabilities failure properly ?? */ | |
644 | get_capabilities(cd); | |
7f9a6bc4 | 645 | blk_queue_prep_rq(sdev->request_queue, sr_prep_fn); |
1da177e4 LT |
646 | sr_vendor_init(cd); |
647 | ||
1da177e4 LT |
648 | disk->driverfs_dev = &sdev->sdev_gendev; |
649 | set_capacity(disk, cd->capacity); | |
650 | disk->private_data = &cd->driver; | |
651 | disk->queue = sdev->request_queue; | |
652 | cd->cdi.disk = disk; | |
653 | ||
654 | if (register_cdrom(&cd->cdi)) | |
655 | goto fail_put; | |
656 | ||
657 | dev_set_drvdata(dev, cd); | |
658 | disk->flags |= GENHD_FL_REMOVABLE; | |
659 | add_disk(disk); | |
660 | ||
9ccfc756 JB |
661 | sdev_printk(KERN_DEBUG, sdev, |
662 | "Attached scsi CD-ROM %s\n", cd->cdi.name); | |
1da177e4 LT |
663 | return 0; |
664 | ||
665 | fail_put: | |
666 | put_disk(disk); | |
667 | fail_free: | |
668 | kfree(cd); | |
669 | fail: | |
670 | return error; | |
671 | } | |
672 | ||
673 | ||
674 | static void get_sectorsize(struct scsi_cd *cd) | |
675 | { | |
676 | unsigned char cmd[10]; | |
62858dac | 677 | unsigned char buffer[8]; |
1da177e4 LT |
678 | int the_result, retries = 3; |
679 | int sector_size; | |
165125e1 | 680 | struct request_queue *queue; |
1da177e4 | 681 | |
1da177e4 LT |
682 | do { |
683 | cmd[0] = READ_CAPACITY; | |
684 | memset((void *) &cmd[1], 0, 9); | |
62858dac | 685 | memset(buffer, 0, sizeof(buffer)); |
1da177e4 LT |
686 | |
687 | /* Do the command and wait.. */ | |
820732b5 | 688 | the_result = scsi_execute_req(cd->device, cmd, DMA_FROM_DEVICE, |
62858dac | 689 | buffer, sizeof(buffer), NULL, |
f4f4e47e | 690 | SR_TIMEOUT, MAX_RETRIES, NULL); |
1da177e4 | 691 | |
1da177e4 LT |
692 | retries--; |
693 | ||
694 | } while (the_result && retries); | |
695 | ||
696 | ||
1da177e4 LT |
697 | if (the_result) { |
698 | cd->capacity = 0x1fffff; | |
699 | sector_size = 2048; /* A guess, just in case */ | |
1da177e4 | 700 | } else { |
5915136d TH |
701 | long last_written; |
702 | ||
703 | cd->capacity = 1 + ((buffer[0] << 24) | (buffer[1] << 16) | | |
704 | (buffer[2] << 8) | buffer[3]); | |
705 | /* | |
706 | * READ_CAPACITY doesn't return the correct size on | |
707 | * certain UDF media. If last_written is larger, use | |
708 | * it instead. | |
709 | * | |
710 | * http://bugzilla.kernel.org/show_bug.cgi?id=9668 | |
711 | */ | |
712 | if (!cdrom_get_last_written(&cd->cdi, &last_written)) | |
713 | cd->capacity = max_t(long, cd->capacity, last_written); | |
714 | ||
1da177e4 LT |
715 | sector_size = (buffer[4] << 24) | |
716 | (buffer[5] << 16) | (buffer[6] << 8) | buffer[7]; | |
717 | switch (sector_size) { | |
718 | /* | |
719 | * HP 4020i CD-Recorder reports 2340 byte sectors | |
720 | * Philips CD-Writers report 2352 byte sectors | |
721 | * | |
722 | * Use 2k sectors for them.. | |
723 | */ | |
724 | case 0: | |
725 | case 2340: | |
726 | case 2352: | |
727 | sector_size = 2048; | |
728 | /* fall through */ | |
729 | case 2048: | |
730 | cd->capacity *= 4; | |
731 | /* fall through */ | |
732 | case 512: | |
733 | break; | |
734 | default: | |
735 | printk("%s: unsupported sector size %d.\n", | |
736 | cd->cdi.name, sector_size); | |
737 | cd->capacity = 0; | |
1da177e4 LT |
738 | } |
739 | ||
740 | cd->device->sector_size = sector_size; | |
741 | ||
742 | /* | |
743 | * Add this so that we have the ability to correctly gauge | |
744 | * what the device is capable of. | |
745 | */ | |
1da177e4 LT |
746 | set_capacity(cd->disk, cd->capacity); |
747 | } | |
748 | ||
749 | queue = cd->device->request_queue; | |
e1defc4f | 750 | blk_queue_logical_block_size(queue, sector_size); |
1da177e4 | 751 | |
62858dac | 752 | return; |
1da177e4 LT |
753 | } |
754 | ||
755 | static void get_capabilities(struct scsi_cd *cd) | |
756 | { | |
757 | unsigned char *buffer; | |
758 | struct scsi_mode_data data; | |
820732b5 | 759 | struct scsi_sense_hdr sshdr; |
38582a62 | 760 | int rc, n; |
1da177e4 | 761 | |
0ad78200 | 762 | static const char *loadmech[] = |
1da177e4 LT |
763 | { |
764 | "caddy", | |
765 | "tray", | |
766 | "pop-up", | |
767 | "", | |
768 | "changer", | |
769 | "cartridge changer", | |
770 | "", | |
771 | "" | |
772 | }; | |
773 | ||
1da177e4 LT |
774 | |
775 | /* allocate transfer buffer */ | |
776 | buffer = kmalloc(512, GFP_KERNEL | GFP_DMA); | |
777 | if (!buffer) { | |
778 | printk(KERN_ERR "sr: out of memory.\n"); | |
1da177e4 LT |
779 | return; |
780 | } | |
781 | ||
38582a62 JB |
782 | /* eat unit attentions */ |
783 | sr_test_unit_ready(cd->device, &sshdr); | |
1da177e4 LT |
784 | |
785 | /* ask for mode page 0x2a */ | |
786 | rc = scsi_mode_sense(cd->device, 0, 0x2a, buffer, 128, | |
1cf72699 | 787 | SR_TIMEOUT, 3, &data, NULL); |
1da177e4 LT |
788 | |
789 | if (!scsi_status_is_good(rc)) { | |
790 | /* failed, drive doesn't have capabilities mode page */ | |
791 | cd->cdi.speed = 1; | |
792 | cd->cdi.mask |= (CDC_CD_R | CDC_CD_RW | CDC_DVD_R | | |
bcc1e382 CE |
793 | CDC_DVD | CDC_DVD_RAM | |
794 | CDC_SELECT_DISC | CDC_SELECT_SPEED | | |
795 | CDC_MRW | CDC_MRW_W | CDC_RAM); | |
1da177e4 LT |
796 | kfree(buffer); |
797 | printk("%s: scsi-1 drive\n", cd->cdi.name); | |
798 | return; | |
799 | } | |
800 | ||
801 | n = data.header_length + data.block_descriptor_length; | |
802 | cd->cdi.speed = ((buffer[n + 8] << 8) + buffer[n + 9]) / 176; | |
803 | cd->readcd_known = 1; | |
804 | cd->readcd_cdda = buffer[n + 5] & 0x01; | |
805 | /* print some capability bits */ | |
806 | printk("%s: scsi3-mmc drive: %dx/%dx %s%s%s%s%s%s\n", cd->cdi.name, | |
807 | ((buffer[n + 14] << 8) + buffer[n + 15]) / 176, | |
808 | cd->cdi.speed, | |
809 | buffer[n + 3] & 0x01 ? "writer " : "", /* CD Writer */ | |
810 | buffer[n + 3] & 0x20 ? "dvd-ram " : "", | |
811 | buffer[n + 2] & 0x02 ? "cd/rw " : "", /* can read rewriteable */ | |
812 | buffer[n + 4] & 0x20 ? "xa/form2 " : "", /* can read xa/from2 */ | |
813 | buffer[n + 5] & 0x01 ? "cdda " : "", /* can read audio data */ | |
814 | loadmech[buffer[n + 6] >> 5]); | |
815 | if ((buffer[n + 6] >> 5) == 0) | |
816 | /* caddy drives can't close tray... */ | |
817 | cd->cdi.mask |= CDC_CLOSE_TRAY; | |
818 | if ((buffer[n + 2] & 0x8) == 0) | |
819 | /* not a DVD drive */ | |
820 | cd->cdi.mask |= CDC_DVD; | |
821 | if ((buffer[n + 3] & 0x20) == 0) | |
822 | /* can't write DVD-RAM media */ | |
823 | cd->cdi.mask |= CDC_DVD_RAM; | |
824 | if ((buffer[n + 3] & 0x10) == 0) | |
825 | /* can't write DVD-R media */ | |
826 | cd->cdi.mask |= CDC_DVD_R; | |
827 | if ((buffer[n + 3] & 0x2) == 0) | |
828 | /* can't write CD-RW media */ | |
829 | cd->cdi.mask |= CDC_CD_RW; | |
830 | if ((buffer[n + 3] & 0x1) == 0) | |
831 | /* can't write CD-R media */ | |
832 | cd->cdi.mask |= CDC_CD_R; | |
833 | if ((buffer[n + 6] & 0x8) == 0) | |
834 | /* can't eject */ | |
835 | cd->cdi.mask |= CDC_OPEN_TRAY; | |
836 | ||
837 | if ((buffer[n + 6] >> 5) == mechtype_individual_changer || | |
838 | (buffer[n + 6] >> 5) == mechtype_cartridge_changer) | |
839 | cd->cdi.capacity = | |
840 | cdrom_number_of_slots(&cd->cdi); | |
841 | if (cd->cdi.capacity <= 1) | |
842 | /* not a changer */ | |
843 | cd->cdi.mask |= CDC_SELECT_DISC; | |
844 | /*else I don't think it can close its tray | |
845 | cd->cdi.mask |= CDC_CLOSE_TRAY; */ | |
846 | ||
847 | /* | |
848 | * if DVD-RAM, MRW-W or CD-RW, we are randomly writable | |
849 | */ | |
850 | if ((cd->cdi.mask & (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) != | |
851 | (CDC_DVD_RAM | CDC_MRW_W | CDC_RAM | CDC_CD_RW)) { | |
852 | cd->device->writeable = 1; | |
853 | } | |
854 | ||
1da177e4 LT |
855 | kfree(buffer); |
856 | } | |
857 | ||
858 | /* | |
859 | * sr_packet() is the entry point for the generic commands generated | |
860 | * by the Uniform CD-ROM layer. | |
861 | */ | |
862 | static int sr_packet(struct cdrom_device_info *cdi, | |
863 | struct packet_command *cgc) | |
864 | { | |
8e04d805 HG |
865 | struct scsi_cd *cd = cdi->handle; |
866 | struct scsi_device *sdev = cd->device; | |
867 | ||
868 | if (cgc->cmd[0] == GPCMD_READ_DISC_INFO && sdev->no_read_disc_info) | |
869 | return -EDRIVE_CANT_DO_THIS; | |
870 | ||
1da177e4 LT |
871 | if (cgc->timeout <= 0) |
872 | cgc->timeout = IOCTL_TIMEOUT; | |
873 | ||
8e04d805 | 874 | sr_do_ioctl(cd, cgc); |
1da177e4 LT |
875 | |
876 | return cgc->stat; | |
877 | } | |
878 | ||
879 | /** | |
880 | * sr_kref_release - Called to free the scsi_cd structure | |
881 | * @kref: pointer to embedded kref | |
882 | * | |
0b950672 | 883 | * sr_ref_mutex must be held entering this routine. Because it is |
1da177e4 LT |
884 | * called on last put, you should always use the scsi_cd_get() |
885 | * scsi_cd_put() helpers which manipulate the semaphore directly | |
886 | * and never do a direct kref_put(). | |
887 | **/ | |
888 | static void sr_kref_release(struct kref *kref) | |
889 | { | |
890 | struct scsi_cd *cd = container_of(kref, struct scsi_cd, kref); | |
891 | struct gendisk *disk = cd->disk; | |
892 | ||
893 | spin_lock(&sr_index_lock); | |
f331c029 | 894 | clear_bit(MINOR(disk_devt(disk)), sr_index_bits); |
1da177e4 LT |
895 | spin_unlock(&sr_index_lock); |
896 | ||
897 | unregister_cdrom(&cd->cdi); | |
898 | ||
899 | disk->private_data = NULL; | |
900 | ||
901 | put_disk(disk); | |
902 | ||
903 | kfree(cd); | |
904 | } | |
905 | ||
906 | static int sr_remove(struct device *dev) | |
907 | { | |
908 | struct scsi_cd *cd = dev_get_drvdata(dev); | |
909 | ||
b391277a | 910 | blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn); |
1da177e4 LT |
911 | del_gendisk(cd->disk); |
912 | ||
0b950672 | 913 | mutex_lock(&sr_ref_mutex); |
1da177e4 | 914 | kref_put(&cd->kref, sr_kref_release); |
0b950672 | 915 | mutex_unlock(&sr_ref_mutex); |
1da177e4 LT |
916 | |
917 | return 0; | |
918 | } | |
919 | ||
920 | static int __init init_sr(void) | |
921 | { | |
922 | int rc; | |
923 | ||
924 | rc = register_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
925 | if (rc) | |
926 | return rc; | |
da3962fe AM |
927 | rc = scsi_register_driver(&sr_template.gendrv); |
928 | if (rc) | |
929 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
930 | ||
931 | return rc; | |
1da177e4 LT |
932 | } |
933 | ||
934 | static void __exit exit_sr(void) | |
935 | { | |
936 | scsi_unregister_driver(&sr_template.gendrv); | |
937 | unregister_blkdev(SCSI_CDROM_MAJOR, "sr"); | |
938 | } | |
939 | ||
940 | module_init(init_sr); | |
941 | module_exit(exit_sr); | |
942 | MODULE_LICENSE("GPL"); |