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