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1da177e4 LT |
1 | /* |
2 | * scsi.c Copyright (C) 1992 Drew Eckhardt | |
3 | * Copyright (C) 1993, 1994, 1995, 1999 Eric Youngdale | |
4 | * Copyright (C) 2002, 2003 Christoph Hellwig | |
5 | * | |
6 | * generic mid-level SCSI driver | |
7 | * Initial versions: Drew Eckhardt | |
8 | * Subsequent revisions: Eric Youngdale | |
9 | * | |
10 | * <drew@colorado.edu> | |
11 | * | |
12 | * Bug correction thanks go to : | |
13 | * Rik Faith <faith@cs.unc.edu> | |
14 | * Tommy Thorn <tthorn> | |
15 | * Thomas Wuensche <tw@fgb1.fgb.mw.tu-muenchen.de> | |
16 | * | |
17 | * Modified by Eric Youngdale eric@andante.org or ericy@gnu.ai.mit.edu to | |
18 | * add scatter-gather, multiple outstanding request, and other | |
19 | * enhancements. | |
20 | * | |
21 | * Native multichannel, wide scsi, /proc/scsi and hot plugging | |
22 | * support added by Michael Neuffer <mike@i-connect.net> | |
23 | * | |
24 | * Added request_module("scsi_hostadapter") for kerneld: | |
25 | * (Put an "alias scsi_hostadapter your_hostadapter" in /etc/modprobe.conf) | |
26 | * Bjorn Ekwall <bj0rn@blox.se> | |
27 | * (changed to kmod) | |
28 | * | |
29 | * Major improvements to the timeout, abort, and reset processing, | |
30 | * as well as performance modifications for large queue depths by | |
31 | * Leonard N. Zubkoff <lnz@dandelion.com> | |
32 | * | |
33 | * Converted cli() code to spinlocks, Ingo Molnar | |
34 | * | |
35 | * Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli | |
36 | * | |
37 | * out_of_space hacks, D. Gilbert (dpg) 990608 | |
38 | */ | |
39 | ||
40 | #include <linux/module.h> | |
41 | #include <linux/moduleparam.h> | |
42 | #include <linux/kernel.h> | |
1da177e4 LT |
43 | #include <linux/timer.h> |
44 | #include <linux/string.h> | |
45 | #include <linux/slab.h> | |
46 | #include <linux/blkdev.h> | |
47 | #include <linux/delay.h> | |
48 | #include <linux/init.h> | |
49 | #include <linux/completion.h> | |
1da177e4 LT |
50 | #include <linux/unistd.h> |
51 | #include <linux/spinlock.h> | |
52 | #include <linux/kmod.h> | |
53 | #include <linux/interrupt.h> | |
54 | #include <linux/notifier.h> | |
55 | #include <linux/cpu.h> | |
0b950672 | 56 | #include <linux/mutex.h> |
2955b47d | 57 | #include <linux/async.h> |
3c6bdaea | 58 | #include <asm/unaligned.h> |
1da177e4 LT |
59 | |
60 | #include <scsi/scsi.h> | |
61 | #include <scsi/scsi_cmnd.h> | |
62 | #include <scsi/scsi_dbg.h> | |
63 | #include <scsi/scsi_device.h> | |
7b3d9545 | 64 | #include <scsi/scsi_driver.h> |
1da177e4 LT |
65 | #include <scsi/scsi_eh.h> |
66 | #include <scsi/scsi_host.h> | |
67 | #include <scsi/scsi_tcq.h> | |
1da177e4 LT |
68 | |
69 | #include "scsi_priv.h" | |
70 | #include "scsi_logging.h" | |
71 | ||
bf816235 KT |
72 | #define CREATE_TRACE_POINTS |
73 | #include <trace/events/scsi.h> | |
74 | ||
1da177e4 LT |
75 | /* |
76 | * Definitions and constants. | |
77 | */ | |
78 | ||
1da177e4 LT |
79 | /* |
80 | * Note - the initial logging level can be set here to log events at boot time. | |
81 | * After the system is up, you may enable logging via the /proc interface. | |
82 | */ | |
83 | unsigned int scsi_logging_level; | |
84 | #if defined(CONFIG_SCSI_LOGGING) | |
85 | EXPORT_SYMBOL(scsi_logging_level); | |
86 | #endif | |
87 | ||
ea80dade | 88 | /* sd, scsi core and power management need to coordinate flushing async actions */ |
2955b47d | 89 | ASYNC_DOMAIN(scsi_sd_probe_domain); |
a7a20d10 | 90 | EXPORT_SYMBOL(scsi_sd_probe_domain); |
a7a20d10 | 91 | |
3c31b52f DW |
92 | /* |
93 | * Separate domain (from scsi_sd_probe_domain) to maximize the benefit of | |
94 | * asynchronous system resume operations. It is marked 'exclusive' to avoid | |
95 | * being included in the async_synchronize_full() that is invoked by | |
96 | * dpm_resume() | |
97 | */ | |
98 | ASYNC_DOMAIN_EXCLUSIVE(scsi_sd_pm_domain); | |
99 | EXPORT_SYMBOL(scsi_sd_pm_domain); | |
100 | ||
1da177e4 | 101 | struct scsi_host_cmd_pool { |
5b7f1680 JB |
102 | struct kmem_cache *cmd_slab; |
103 | struct kmem_cache *sense_slab; | |
104 | unsigned int users; | |
105 | char *cmd_name; | |
106 | char *sense_name; | |
107 | unsigned int slab_flags; | |
108 | gfp_t gfp_mask; | |
1da177e4 LT |
109 | }; |
110 | ||
111 | static struct scsi_host_cmd_pool scsi_cmd_pool = { | |
5b7f1680 JB |
112 | .cmd_name = "scsi_cmd_cache", |
113 | .sense_name = "scsi_sense_cache", | |
1da177e4 LT |
114 | .slab_flags = SLAB_HWCACHE_ALIGN, |
115 | }; | |
116 | ||
117 | static struct scsi_host_cmd_pool scsi_cmd_dma_pool = { | |
5b7f1680 JB |
118 | .cmd_name = "scsi_cmd_cache(DMA)", |
119 | .sense_name = "scsi_sense_cache(DMA)", | |
1da177e4 LT |
120 | .slab_flags = SLAB_HWCACHE_ALIGN|SLAB_CACHE_DMA, |
121 | .gfp_mask = __GFP_DMA, | |
122 | }; | |
123 | ||
0b950672 | 124 | static DEFINE_MUTEX(host_cmd_pool_mutex); |
1da177e4 | 125 | |
e507e30b | 126 | /** |
7c283341 CH |
127 | * scsi_host_free_command - internal function to release a command |
128 | * @shost: host to free the command for | |
e507e30b JB |
129 | * @cmd: command to release |
130 | * | |
131 | * the command must previously have been allocated by | |
7c283341 | 132 | * scsi_host_alloc_command. |
e507e30b JB |
133 | */ |
134 | static void | |
7c283341 | 135 | scsi_host_free_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd) |
e507e30b | 136 | { |
7c283341 CH |
137 | struct scsi_host_cmd_pool *pool = shost->cmd_pool; |
138 | ||
7027ad72 MP |
139 | if (cmd->prot_sdb) |
140 | kmem_cache_free(scsi_sdb_cache, cmd->prot_sdb); | |
e507e30b JB |
141 | kmem_cache_free(pool->sense_slab, cmd->sense_buffer); |
142 | kmem_cache_free(pool->cmd_slab, cmd); | |
143 | } | |
144 | ||
7027ad72 MP |
145 | /** |
146 | * scsi_host_alloc_command - internal function to allocate command | |
147 | * @shost: SCSI host whose pool to allocate from | |
148 | * @gfp_mask: mask for the allocation | |
149 | * | |
150 | * Returns a fully allocated command with sense buffer and protection | |
151 | * data buffer (where applicable) or NULL on failure | |
152 | */ | |
153 | static struct scsi_cmnd * | |
154 | scsi_host_alloc_command(struct Scsi_Host *shost, gfp_t gfp_mask) | |
155 | { | |
7c283341 | 156 | struct scsi_host_cmd_pool *pool = shost->cmd_pool; |
7027ad72 MP |
157 | struct scsi_cmnd *cmd; |
158 | ||
7c283341 | 159 | cmd = kmem_cache_zalloc(pool->cmd_slab, gfp_mask | pool->gfp_mask); |
7027ad72 | 160 | if (!cmd) |
7c283341 CH |
161 | goto fail; |
162 | ||
163 | cmd->sense_buffer = kmem_cache_alloc(pool->sense_slab, | |
164 | gfp_mask | pool->gfp_mask); | |
165 | if (!cmd->sense_buffer) | |
166 | goto fail_free_cmd; | |
7027ad72 MP |
167 | |
168 | if (scsi_host_get_prot(shost) >= SHOST_DIX_TYPE0_PROTECTION) { | |
169 | cmd->prot_sdb = kmem_cache_zalloc(scsi_sdb_cache, gfp_mask); | |
7c283341 CH |
170 | if (!cmd->prot_sdb) |
171 | goto fail_free_sense; | |
7027ad72 MP |
172 | } |
173 | ||
174 | return cmd; | |
7c283341 CH |
175 | |
176 | fail_free_sense: | |
177 | kmem_cache_free(pool->sense_slab, cmd->sense_buffer); | |
178 | fail_free_cmd: | |
179 | kmem_cache_free(pool->cmd_slab, cmd); | |
180 | fail: | |
181 | return NULL; | |
7027ad72 MP |
182 | } |
183 | ||
eb44820c RL |
184 | /** |
185 | * __scsi_get_command - Allocate a struct scsi_cmnd | |
186 | * @shost: host to transmit command | |
187 | * @gfp_mask: allocation mask | |
188 | * | |
189 | * Description: allocate a struct scsi_cmd from host's slab, recycling from the | |
190 | * host's free_list if necessary. | |
191 | */ | |
f1bea55d CH |
192 | static struct scsi_cmnd * |
193 | __scsi_get_command(struct Scsi_Host *shost, gfp_t gfp_mask) | |
1da177e4 | 194 | { |
b4c2554d | 195 | struct scsi_cmnd *cmd = scsi_host_alloc_command(shost, gfp_mask); |
164fc5dc | 196 | |
1da177e4 LT |
197 | if (unlikely(!cmd)) { |
198 | unsigned long flags; | |
199 | ||
200 | spin_lock_irqsave(&shost->free_list_lock, flags); | |
201 | if (likely(!list_empty(&shost->free_list))) { | |
202 | cmd = list_entry(shost->free_list.next, | |
203 | struct scsi_cmnd, list); | |
204 | list_del_init(&cmd->list); | |
205 | } | |
206 | spin_unlock_irqrestore(&shost->free_list_lock, flags); | |
de25deb1 FT |
207 | |
208 | if (cmd) { | |
b4c2554d MP |
209 | void *buf, *prot; |
210 | ||
de25deb1 | 211 | buf = cmd->sense_buffer; |
b4c2554d MP |
212 | prot = cmd->prot_sdb; |
213 | ||
de25deb1 | 214 | memset(cmd, 0, sizeof(*cmd)); |
b4c2554d | 215 | |
de25deb1 | 216 | cmd->sense_buffer = buf; |
b4c2554d | 217 | cmd->prot_sdb = prot; |
de25deb1 | 218 | } |
1da177e4 LT |
219 | } |
220 | ||
221 | return cmd; | |
222 | } | |
223 | ||
eb44820c RL |
224 | /** |
225 | * scsi_get_command - Allocate and setup a scsi command block | |
226 | * @dev: parent scsi device | |
227 | * @gfp_mask: allocator flags | |
1da177e4 LT |
228 | * |
229 | * Returns: The allocated scsi command structure. | |
230 | */ | |
c53033f6 | 231 | struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, gfp_t gfp_mask) |
1da177e4 | 232 | { |
04796336 CH |
233 | struct scsi_cmnd *cmd = __scsi_get_command(dev->host, gfp_mask); |
234 | unsigned long flags; | |
1da177e4 | 235 | |
04796336 | 236 | if (unlikely(cmd == NULL)) |
1da177e4 LT |
237 | return NULL; |
238 | ||
04796336 CH |
239 | cmd->device = dev; |
240 | INIT_LIST_HEAD(&cmd->list); | |
241 | INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler); | |
242 | spin_lock_irqsave(&dev->list_lock, flags); | |
243 | list_add_tail(&cmd->list, &dev->cmd_list); | |
244 | spin_unlock_irqrestore(&dev->list_lock, flags); | |
245 | cmd->jiffies_at_alloc = jiffies; | |
1da177e4 | 246 | return cmd; |
b58d9154 | 247 | } |
1da177e4 | 248 | |
eb44820c RL |
249 | /** |
250 | * __scsi_put_command - Free a struct scsi_cmnd | |
251 | * @shost: dev->host | |
252 | * @cmd: Command to free | |
eb44820c | 253 | */ |
f1bea55d | 254 | static void __scsi_put_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd) |
b58d9154 FT |
255 | { |
256 | unsigned long flags; | |
257 | ||
b58d9154 | 258 | if (unlikely(list_empty(&shost->free_list))) { |
44b93b59 CH |
259 | spin_lock_irqsave(&shost->free_list_lock, flags); |
260 | if (list_empty(&shost->free_list)) { | |
261 | list_add(&cmd->list, &shost->free_list); | |
262 | cmd = NULL; | |
263 | } | |
264 | spin_unlock_irqrestore(&shost->free_list_lock, flags); | |
b58d9154 | 265 | } |
b58d9154 | 266 | |
e507e30b | 267 | if (likely(cmd != NULL)) |
7c283341 | 268 | scsi_host_free_command(shost, cmd); |
b58d9154 | 269 | } |
b58d9154 | 270 | |
eb44820c RL |
271 | /** |
272 | * scsi_put_command - Free a scsi command block | |
273 | * @cmd: command block to free | |
1da177e4 LT |
274 | * |
275 | * Returns: Nothing. | |
276 | * | |
277 | * Notes: The command must not belong to any lists. | |
278 | */ | |
279 | void scsi_put_command(struct scsi_cmnd *cmd) | |
280 | { | |
1da177e4 | 281 | unsigned long flags; |
b58d9154 | 282 | |
1da177e4 LT |
283 | /* serious error if the command hasn't come from a device list */ |
284 | spin_lock_irqsave(&cmd->device->list_lock, flags); | |
285 | BUG_ON(list_empty(&cmd->list)); | |
286 | list_del_init(&cmd->list); | |
b58d9154 | 287 | spin_unlock_irqrestore(&cmd->device->list_lock, flags); |
1da177e4 | 288 | |
fcc95a76 | 289 | BUG_ON(delayed_work_pending(&cmd->abort_work)); |
e494f6a7 | 290 | |
04796336 | 291 | __scsi_put_command(cmd->device->host, cmd); |
1da177e4 | 292 | } |
1da177e4 | 293 | |
89d9a567 CH |
294 | static struct scsi_host_cmd_pool * |
295 | scsi_find_host_cmd_pool(struct Scsi_Host *shost) | |
1da177e4 | 296 | { |
89d9a567 CH |
297 | if (shost->hostt->cmd_size) |
298 | return shost->hostt->cmd_pool; | |
299 | if (shost->unchecked_isa_dma) | |
300 | return &scsi_cmd_dma_pool; | |
301 | return &scsi_cmd_pool; | |
302 | } | |
303 | ||
304 | static void | |
305 | scsi_free_host_cmd_pool(struct scsi_host_cmd_pool *pool) | |
306 | { | |
307 | kfree(pool->sense_name); | |
308 | kfree(pool->cmd_name); | |
309 | kfree(pool); | |
310 | } | |
311 | ||
312 | static struct scsi_host_cmd_pool * | |
313 | scsi_alloc_host_cmd_pool(struct Scsi_Host *shost) | |
314 | { | |
315 | struct scsi_host_template *hostt = shost->hostt; | |
316 | struct scsi_host_cmd_pool *pool; | |
317 | ||
318 | pool = kzalloc(sizeof(*pool), GFP_KERNEL); | |
319 | if (!pool) | |
320 | return NULL; | |
321 | ||
884ffee0 JB |
322 | pool->cmd_name = kasprintf(GFP_KERNEL, "%s_cmd", hostt->proc_name); |
323 | pool->sense_name = kasprintf(GFP_KERNEL, "%s_sense", hostt->proc_name); | |
89d9a567 CH |
324 | if (!pool->cmd_name || !pool->sense_name) { |
325 | scsi_free_host_cmd_pool(pool); | |
326 | return NULL; | |
327 | } | |
328 | ||
329 | pool->slab_flags = SLAB_HWCACHE_ALIGN; | |
330 | if (shost->unchecked_isa_dma) { | |
331 | pool->slab_flags |= SLAB_CACHE_DMA; | |
332 | pool->gfp_mask = __GFP_DMA; | |
333 | } | |
f6105c08 JG |
334 | |
335 | if (hostt->cmd_size) | |
336 | hostt->cmd_pool = pool; | |
337 | ||
89d9a567 CH |
338 | return pool; |
339 | } | |
340 | ||
341 | static struct scsi_host_cmd_pool * | |
342 | scsi_get_host_cmd_pool(struct Scsi_Host *shost) | |
343 | { | |
344 | struct scsi_host_template *hostt = shost->hostt; | |
1c353f7d | 345 | struct scsi_host_cmd_pool *retval = NULL, *pool; |
89d9a567 CH |
346 | size_t cmd_size = sizeof(struct scsi_cmnd) + hostt->cmd_size; |
347 | ||
1da177e4 LT |
348 | /* |
349 | * Select a command slab for this host and create it if not | |
eb44820c | 350 | * yet existent. |
1da177e4 | 351 | */ |
0b950672 | 352 | mutex_lock(&host_cmd_pool_mutex); |
89d9a567 CH |
353 | pool = scsi_find_host_cmd_pool(shost); |
354 | if (!pool) { | |
355 | pool = scsi_alloc_host_cmd_pool(shost); | |
356 | if (!pool) | |
357 | goto out; | |
358 | } | |
359 | ||
1da177e4 | 360 | if (!pool->users) { |
89d9a567 | 361 | pool->cmd_slab = kmem_cache_create(pool->cmd_name, cmd_size, 0, |
5b7f1680 JB |
362 | pool->slab_flags, NULL); |
363 | if (!pool->cmd_slab) | |
89d9a567 | 364 | goto out_free_pool; |
5b7f1680 JB |
365 | |
366 | pool->sense_slab = kmem_cache_create(pool->sense_name, | |
367 | SCSI_SENSE_BUFFERSIZE, 0, | |
368 | pool->slab_flags, NULL); | |
89d9a567 CH |
369 | if (!pool->sense_slab) |
370 | goto out_free_slab; | |
1da177e4 LT |
371 | } |
372 | ||
373 | pool->users++; | |
1c353f7d | 374 | retval = pool; |
89d9a567 | 375 | out: |
0b950672 | 376 | mutex_unlock(&host_cmd_pool_mutex); |
1c353f7d | 377 | return retval; |
89d9a567 CH |
378 | |
379 | out_free_slab: | |
380 | kmem_cache_destroy(pool->cmd_slab); | |
381 | out_free_pool: | |
f6105c08 | 382 | if (hostt->cmd_size) { |
89d9a567 | 383 | scsi_free_host_cmd_pool(pool); |
f6105c08 JG |
384 | hostt->cmd_pool = NULL; |
385 | } | |
89d9a567 | 386 | goto out; |
1c353f7d JB |
387 | } |
388 | ||
89d9a567 | 389 | static void scsi_put_host_cmd_pool(struct Scsi_Host *shost) |
1c353f7d | 390 | { |
89d9a567 | 391 | struct scsi_host_template *hostt = shost->hostt; |
1c353f7d | 392 | struct scsi_host_cmd_pool *pool; |
1da177e4 | 393 | |
1c353f7d | 394 | mutex_lock(&host_cmd_pool_mutex); |
89d9a567 CH |
395 | pool = scsi_find_host_cmd_pool(shost); |
396 | ||
1da177e4 | 397 | /* |
1c353f7d JB |
398 | * This may happen if a driver has a mismatched get and put |
399 | * of the command pool; the driver should be implicated in | |
400 | * the stack trace | |
1da177e4 | 401 | */ |
1c353f7d | 402 | BUG_ON(pool->users == 0); |
de25deb1 | 403 | |
5b7f1680 JB |
404 | if (!--pool->users) { |
405 | kmem_cache_destroy(pool->cmd_slab); | |
406 | kmem_cache_destroy(pool->sense_slab); | |
f6105c08 | 407 | if (hostt->cmd_size) { |
89d9a567 | 408 | scsi_free_host_cmd_pool(pool); |
f6105c08 JG |
409 | hostt->cmd_pool = NULL; |
410 | } | |
5b7f1680 | 411 | } |
0b950672 | 412 | mutex_unlock(&host_cmd_pool_mutex); |
1c353f7d JB |
413 | } |
414 | ||
1c353f7d JB |
415 | /** |
416 | * scsi_setup_command_freelist - Setup the command freelist for a scsi host. | |
417 | * @shost: host to allocate the freelist for. | |
418 | * | |
419 | * Description: The command freelist protects against system-wide out of memory | |
420 | * deadlock by preallocating one SCSI command structure for each host, so the | |
421 | * system can always write to a swap file on a device associated with that host. | |
422 | * | |
423 | * Returns: Nothing. | |
424 | */ | |
425 | int scsi_setup_command_freelist(struct Scsi_Host *shost) | |
426 | { | |
1c353f7d | 427 | const gfp_t gfp_mask = shost->unchecked_isa_dma ? GFP_DMA : GFP_KERNEL; |
89d9a567 | 428 | struct scsi_cmnd *cmd; |
1c353f7d JB |
429 | |
430 | spin_lock_init(&shost->free_list_lock); | |
431 | INIT_LIST_HEAD(&shost->free_list); | |
432 | ||
89d9a567 | 433 | shost->cmd_pool = scsi_get_host_cmd_pool(shost); |
1c353f7d JB |
434 | if (!shost->cmd_pool) |
435 | return -ENOMEM; | |
436 | ||
437 | /* | |
438 | * Get one backup command for this host. | |
439 | */ | |
7027ad72 | 440 | cmd = scsi_host_alloc_command(shost, gfp_mask); |
1c353f7d | 441 | if (!cmd) { |
89d9a567 | 442 | scsi_put_host_cmd_pool(shost); |
61d7416a | 443 | shost->cmd_pool = NULL; |
1c353f7d JB |
444 | return -ENOMEM; |
445 | } | |
446 | list_add(&cmd->list, &shost->free_list); | |
447 | return 0; | |
1da177e4 LT |
448 | } |
449 | ||
eb44820c RL |
450 | /** |
451 | * scsi_destroy_command_freelist - Release the command freelist for a scsi host. | |
452 | * @shost: host whose freelist is going to be destroyed | |
1da177e4 LT |
453 | */ |
454 | void scsi_destroy_command_freelist(struct Scsi_Host *shost) | |
455 | { | |
61d7416a AB |
456 | /* |
457 | * If cmd_pool is NULL the free list was not initialized, so | |
458 | * do not attempt to release resources. | |
459 | */ | |
460 | if (!shost->cmd_pool) | |
461 | return; | |
462 | ||
1da177e4 LT |
463 | while (!list_empty(&shost->free_list)) { |
464 | struct scsi_cmnd *cmd; | |
465 | ||
466 | cmd = list_entry(shost->free_list.next, struct scsi_cmnd, list); | |
467 | list_del_init(&cmd->list); | |
7c283341 | 468 | scsi_host_free_command(shost, cmd); |
1da177e4 | 469 | } |
1c353f7d | 470 | shost->cmd_pool = NULL; |
89d9a567 | 471 | scsi_put_host_cmd_pool(shost); |
de25deb1 FT |
472 | } |
473 | ||
1da177e4 LT |
474 | #ifdef CONFIG_SCSI_LOGGING |
475 | void scsi_log_send(struct scsi_cmnd *cmd) | |
476 | { | |
477 | unsigned int level; | |
1da177e4 LT |
478 | |
479 | /* | |
480 | * If ML QUEUE log level is greater than or equal to: | |
481 | * | |
482 | * 1: nothing (match completion) | |
483 | * | |
c11c004b | 484 | * 2: log opcode + command of all commands + cmd address |
1da177e4 | 485 | * |
c11c004b | 486 | * 3: same as 2 |
1da177e4 | 487 | * |
a4a6afb4 | 488 | * 4: same as 3 |
1da177e4 LT |
489 | */ |
490 | if (unlikely(scsi_logging_level)) { | |
491 | level = SCSI_LOG_LEVEL(SCSI_LOG_MLQUEUE_SHIFT, | |
492 | SCSI_LOG_MLQUEUE_BITS); | |
493 | if (level > 1) { | |
c11c004b HR |
494 | scmd_printk(KERN_INFO, cmd, |
495 | "Send: scmd 0x%p\n", cmd); | |
1da177e4 | 496 | scsi_print_command(cmd); |
1da177e4 LT |
497 | } |
498 | } | |
499 | } | |
500 | ||
501 | void scsi_log_completion(struct scsi_cmnd *cmd, int disposition) | |
502 | { | |
503 | unsigned int level; | |
1da177e4 LT |
504 | |
505 | /* | |
506 | * If ML COMPLETE log level is greater than or equal to: | |
507 | * | |
508 | * 1: log disposition, result, opcode + command, and conditionally | |
509 | * sense data for failures or non SUCCESS dispositions. | |
510 | * | |
511 | * 2: same as 1 but for all command completions. | |
512 | * | |
c11c004b | 513 | * 3: same as 2 |
1da177e4 LT |
514 | * |
515 | * 4: same as 3 plus dump extra junk | |
516 | */ | |
517 | if (unlikely(scsi_logging_level)) { | |
518 | level = SCSI_LOG_LEVEL(SCSI_LOG_MLCOMPLETE_SHIFT, | |
519 | SCSI_LOG_MLCOMPLETE_BITS); | |
520 | if (((level > 0) && (cmd->result || disposition != SUCCESS)) || | |
521 | (level > 1)) { | |
026f8da8 | 522 | scsi_print_result(cmd, "Done", disposition); |
1da177e4 | 523 | scsi_print_command(cmd); |
a4d04a4c | 524 | if (status_byte(cmd->result) & CHECK_CONDITION) |
d811b848 | 525 | scsi_print_sense(cmd); |
a4d04a4c MP |
526 | if (level > 3) |
527 | scmd_printk(KERN_INFO, cmd, | |
528 | "scsi host busy %d failed %d\n", | |
74665016 | 529 | atomic_read(&cmd->device->host->host_busy), |
a4d04a4c | 530 | cmd->device->host->host_failed); |
1da177e4 LT |
531 | } |
532 | } | |
533 | } | |
534 | #endif | |
535 | ||
eb44820c RL |
536 | /** |
537 | * scsi_cmd_get_serial - Assign a serial number to a command | |
538 | * @host: the scsi host | |
539 | * @cmd: command to assign serial number to | |
540 | * | |
541 | * Description: a serial number identifies a request for error recovery | |
1da177e4 LT |
542 | * and debugging purposes. Protected by the Host_Lock of host. |
543 | */ | |
f281233d | 544 | void scsi_cmd_get_serial(struct Scsi_Host *host, struct scsi_cmnd *cmd) |
1da177e4 LT |
545 | { |
546 | cmd->serial_number = host->cmd_serial_number++; | |
547 | if (cmd->serial_number == 0) | |
548 | cmd->serial_number = host->cmd_serial_number++; | |
1da177e4 | 549 | } |
f281233d | 550 | EXPORT_SYMBOL(scsi_cmd_get_serial); |
1da177e4 | 551 | |
eb44820c RL |
552 | /** |
553 | * scsi_finish_command - cleanup and pass command back to upper layer | |
554 | * @cmd: the command | |
1da177e4 | 555 | * |
eb44820c | 556 | * Description: Pass command off to upper layer for finishing of I/O |
1da177e4 LT |
557 | * request, waking processes that are waiting on results, |
558 | * etc. | |
559 | */ | |
560 | void scsi_finish_command(struct scsi_cmnd *cmd) | |
561 | { | |
562 | struct scsi_device *sdev = cmd->device; | |
f0c0a376 | 563 | struct scsi_target *starget = scsi_target(sdev); |
1da177e4 | 564 | struct Scsi_Host *shost = sdev->host; |
7b3d9545 LT |
565 | struct scsi_driver *drv; |
566 | unsigned int good_bytes; | |
1da177e4 LT |
567 | |
568 | scsi_device_unbusy(sdev); | |
569 | ||
cd9070c9 CH |
570 | /* |
571 | * Clear the flags that say that the device/target/host is no longer | |
572 | * capable of accepting new commands. | |
573 | */ | |
574 | if (atomic_read(&shost->host_blocked)) | |
575 | atomic_set(&shost->host_blocked, 0); | |
576 | if (atomic_read(&starget->target_blocked)) | |
577 | atomic_set(&starget->target_blocked, 0); | |
578 | if (atomic_read(&sdev->device_blocked)) | |
579 | atomic_set(&sdev->device_blocked, 0); | |
1da177e4 LT |
580 | |
581 | /* | |
582 | * If we have valid sense information, then some kind of recovery | |
583 | * must have taken place. Make a note of this. | |
584 | */ | |
585 | if (SCSI_SENSE_VALID(cmd)) | |
586 | cmd->result |= (DRIVER_SENSE << 24); | |
587 | ||
3bf743e7 JG |
588 | SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev, |
589 | "Notifying upper driver of completion " | |
590 | "(result %x)\n", cmd->result)); | |
1da177e4 | 591 | |
f18573ab | 592 | good_bytes = scsi_bufflen(cmd); |
7b3d9545 | 593 | if (cmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { |
427e59f0 | 594 | int old_good_bytes = good_bytes; |
7b3d9545 LT |
595 | drv = scsi_cmd_to_driver(cmd); |
596 | if (drv->done) | |
597 | good_bytes = drv->done(cmd); | |
427e59f0 JB |
598 | /* |
599 | * USB may not give sense identifying bad sector and | |
600 | * simply return a residue instead, so subtract off the | |
601 | * residue if drv->done() error processing indicates no | |
602 | * change to the completion length. | |
603 | */ | |
604 | if (good_bytes == old_good_bytes) | |
605 | good_bytes -= scsi_get_resid(cmd); | |
7b3d9545 LT |
606 | } |
607 | scsi_io_completion(cmd, good_bytes); | |
1da177e4 | 608 | } |
1da177e4 | 609 | |
eb44820c | 610 | /** |
db5ed4df | 611 | * scsi_change_queue_depth - change a device's queue depth |
eb44820c | 612 | * @sdev: SCSI Device in question |
db5ed4df | 613 | * @depth: number of commands allowed to be queued to the driver |
1da177e4 | 614 | * |
db5ed4df | 615 | * Sets the device queue depth and returns the new value. |
1da177e4 | 616 | */ |
db5ed4df | 617 | int scsi_change_queue_depth(struct scsi_device *sdev, int depth) |
1da177e4 | 618 | { |
64d513ac CH |
619 | if (depth > 0) { |
620 | sdev->queue_depth = depth; | |
621 | wmb(); | |
885ace9e | 622 | } |
1da177e4 | 623 | |
d278d4a8 JA |
624 | if (sdev->request_queue) |
625 | blk_set_queue_depth(sdev->request_queue, depth); | |
626 | ||
db5ed4df | 627 | return sdev->queue_depth; |
1da177e4 | 628 | } |
db5ed4df | 629 | EXPORT_SYMBOL(scsi_change_queue_depth); |
1da177e4 | 630 | |
eb44820c RL |
631 | /** |
632 | * scsi_track_queue_full - track QUEUE_FULL events to adjust queue depth | |
633 | * @sdev: SCSI Device in question | |
634 | * @depth: Current number of outstanding SCSI commands on this device, | |
635 | * not counting the one returned as QUEUE_FULL. | |
1da177e4 | 636 | * |
eb44820c | 637 | * Description: This function will track successive QUEUE_FULL events on a |
1da177e4 LT |
638 | * specific SCSI device to determine if and when there is a |
639 | * need to adjust the queue depth on the device. | |
640 | * | |
eb44820c | 641 | * Returns: 0 - No change needed, >0 - Adjust queue depth to this new depth, |
1da177e4 LT |
642 | * -1 - Drop back to untagged operation using host->cmd_per_lun |
643 | * as the untagged command depth | |
644 | * | |
645 | * Lock Status: None held on entry | |
646 | * | |
647 | * Notes: Low level drivers may call this at any time and we will do | |
648 | * "The Right Thing." We are interrupt context safe. | |
649 | */ | |
650 | int scsi_track_queue_full(struct scsi_device *sdev, int depth) | |
651 | { | |
4a84067d VD |
652 | |
653 | /* | |
654 | * Don't let QUEUE_FULLs on the same | |
655 | * jiffies count, they could all be from | |
656 | * same event. | |
657 | */ | |
658 | if ((jiffies >> 4) == (sdev->last_queue_full_time >> 4)) | |
1da177e4 LT |
659 | return 0; |
660 | ||
4a84067d | 661 | sdev->last_queue_full_time = jiffies; |
1da177e4 LT |
662 | if (sdev->last_queue_full_depth != depth) { |
663 | sdev->last_queue_full_count = 1; | |
664 | sdev->last_queue_full_depth = depth; | |
665 | } else { | |
666 | sdev->last_queue_full_count++; | |
667 | } | |
668 | ||
669 | if (sdev->last_queue_full_count <= 10) | |
670 | return 0; | |
609aa22f | 671 | |
db5ed4df | 672 | return scsi_change_queue_depth(sdev, depth); |
1da177e4 LT |
673 | } |
674 | EXPORT_SYMBOL(scsi_track_queue_full); | |
675 | ||
881a256d MW |
676 | /** |
677 | * scsi_vpd_inquiry - Request a device provide us with a VPD page | |
678 | * @sdev: The device to ask | |
679 | * @buffer: Where to put the result | |
680 | * @page: Which Vital Product Data to return | |
681 | * @len: The length of the buffer | |
682 | * | |
683 | * This is an internal helper function. You probably want to use | |
684 | * scsi_get_vpd_page instead. | |
685 | * | |
bc8945df | 686 | * Returns size of the vpd page on success or a negative error number. |
881a256d MW |
687 | */ |
688 | static int scsi_vpd_inquiry(struct scsi_device *sdev, unsigned char *buffer, | |
689 | u8 page, unsigned len) | |
690 | { | |
691 | int result; | |
692 | unsigned char cmd[16]; | |
693 | ||
bc8945df HR |
694 | if (len < 4) |
695 | return -EINVAL; | |
696 | ||
881a256d MW |
697 | cmd[0] = INQUIRY; |
698 | cmd[1] = 1; /* EVPD */ | |
699 | cmd[2] = page; | |
700 | cmd[3] = len >> 8; | |
701 | cmd[4] = len & 0xff; | |
702 | cmd[5] = 0; /* Control byte */ | |
703 | ||
704 | /* | |
705 | * I'm not convinced we need to try quite this hard to get VPD, but | |
706 | * all the existing users tried this hard. | |
707 | */ | |
708 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, | |
95a3639e | 709 | len, NULL, 30 * HZ, 3, NULL); |
881a256d | 710 | if (result) |
bc8945df | 711 | return -EIO; |
881a256d MW |
712 | |
713 | /* Sanity check that we got the page back that we asked for */ | |
714 | if (buffer[1] != page) | |
715 | return -EIO; | |
716 | ||
bc8945df | 717 | return get_unaligned_be16(&buffer[2]) + 4; |
881a256d MW |
718 | } |
719 | ||
720 | /** | |
721 | * scsi_get_vpd_page - Get Vital Product Data from a SCSI device | |
722 | * @sdev: The device to ask | |
723 | * @page: Which Vital Product Data to return | |
786f8ba2 RD |
724 | * @buf: where to store the VPD |
725 | * @buf_len: number of bytes in the VPD buffer area | |
881a256d MW |
726 | * |
727 | * SCSI devices may optionally supply Vital Product Data. Each 'page' | |
728 | * of VPD is defined in the appropriate SCSI document (eg SPC, SBC). | |
729 | * If the device supports this VPD page, this routine returns a pointer | |
730 | * to a buffer containing the data from that page. The caller is | |
731 | * responsible for calling kfree() on this pointer when it is no longer | |
732 | * needed. If we cannot retrieve the VPD page this routine returns %NULL. | |
733 | */ | |
e3deec09 JB |
734 | int scsi_get_vpd_page(struct scsi_device *sdev, u8 page, unsigned char *buf, |
735 | int buf_len) | |
881a256d MW |
736 | { |
737 | int i, result; | |
881a256d | 738 | |
7562523e MP |
739 | if (sdev->skip_vpd_pages) |
740 | goto fail; | |
741 | ||
881a256d | 742 | /* Ask for all the pages supported by this device */ |
e3deec09 | 743 | result = scsi_vpd_inquiry(sdev, buf, 0, buf_len); |
bc8945df | 744 | if (result < 4) |
881a256d MW |
745 | goto fail; |
746 | ||
747 | /* If the user actually wanted this page, we can skip the rest */ | |
748 | if (page == 0) | |
16d3ea26 | 749 | return 0; |
881a256d | 750 | |
bc8945df HR |
751 | for (i = 4; i < min(result, buf_len); i++) |
752 | if (buf[i] == page) | |
881a256d | 753 | goto found; |
e3deec09 | 754 | |
bc8945df | 755 | if (i < result && i >= buf_len) |
e3deec09 JB |
756 | /* ran off the end of the buffer, give us benefit of doubt */ |
757 | goto found; | |
881a256d MW |
758 | /* The device claims it doesn't support the requested page */ |
759 | goto fail; | |
760 | ||
761 | found: | |
e3deec09 | 762 | result = scsi_vpd_inquiry(sdev, buf, page, buf_len); |
bc8945df | 763 | if (result < 0) |
881a256d MW |
764 | goto fail; |
765 | ||
e3deec09 | 766 | return 0; |
881a256d MW |
767 | |
768 | fail: | |
e3deec09 | 769 | return -EINVAL; |
881a256d MW |
770 | } |
771 | EXPORT_SYMBOL_GPL(scsi_get_vpd_page); | |
772 | ||
b3ae8780 HR |
773 | /** |
774 | * scsi_attach_vpd - Attach Vital Product Data to a SCSI device structure | |
775 | * @sdev: The device to ask | |
776 | * | |
777 | * Attach the 'Device Identification' VPD page (0x83) and the | |
778 | * 'Unit Serial Number' VPD page (0x80) to a SCSI device | |
779 | * structure. This information can be used to identify the device | |
780 | * uniquely. | |
781 | */ | |
782 | void scsi_attach_vpd(struct scsi_device *sdev) | |
783 | { | |
784 | int result, i; | |
785 | int vpd_len = SCSI_VPD_PG_LEN; | |
786 | int pg80_supported = 0; | |
787 | int pg83_supported = 0; | |
09e2b0b1 | 788 | unsigned char __rcu *vpd_buf, *orig_vpd_buf = NULL; |
b3ae8780 | 789 | |
5ddfe085 | 790 | if (!scsi_device_supports_vpd(sdev)) |
b3ae8780 | 791 | return; |
5ddfe085 | 792 | |
b3ae8780 HR |
793 | retry_pg0: |
794 | vpd_buf = kmalloc(vpd_len, GFP_KERNEL); | |
795 | if (!vpd_buf) | |
796 | return; | |
797 | ||
798 | /* Ask for all the pages supported by this device */ | |
799 | result = scsi_vpd_inquiry(sdev, vpd_buf, 0, vpd_len); | |
800 | if (result < 0) { | |
801 | kfree(vpd_buf); | |
802 | return; | |
803 | } | |
804 | if (result > vpd_len) { | |
805 | vpd_len = result; | |
806 | kfree(vpd_buf); | |
807 | goto retry_pg0; | |
808 | } | |
809 | ||
810 | for (i = 4; i < result; i++) { | |
811 | if (vpd_buf[i] == 0x80) | |
812 | pg80_supported = 1; | |
813 | if (vpd_buf[i] == 0x83) | |
814 | pg83_supported = 1; | |
815 | } | |
816 | kfree(vpd_buf); | |
817 | vpd_len = SCSI_VPD_PG_LEN; | |
818 | ||
819 | if (pg80_supported) { | |
820 | retry_pg80: | |
821 | vpd_buf = kmalloc(vpd_len, GFP_KERNEL); | |
822 | if (!vpd_buf) | |
823 | return; | |
824 | ||
825 | result = scsi_vpd_inquiry(sdev, vpd_buf, 0x80, vpd_len); | |
826 | if (result < 0) { | |
827 | kfree(vpd_buf); | |
828 | return; | |
829 | } | |
830 | if (result > vpd_len) { | |
831 | vpd_len = result; | |
832 | kfree(vpd_buf); | |
833 | goto retry_pg80; | |
834 | } | |
09e2b0b1 HR |
835 | mutex_lock(&sdev->inquiry_mutex); |
836 | orig_vpd_buf = sdev->vpd_pg80; | |
b3ae8780 | 837 | sdev->vpd_pg80_len = result; |
09e2b0b1 HR |
838 | rcu_assign_pointer(sdev->vpd_pg80, vpd_buf); |
839 | mutex_unlock(&sdev->inquiry_mutex); | |
840 | synchronize_rcu(); | |
841 | if (orig_vpd_buf) { | |
842 | kfree(orig_vpd_buf); | |
843 | orig_vpd_buf = NULL; | |
844 | } | |
b3ae8780 HR |
845 | vpd_len = SCSI_VPD_PG_LEN; |
846 | } | |
847 | ||
848 | if (pg83_supported) { | |
849 | retry_pg83: | |
850 | vpd_buf = kmalloc(vpd_len, GFP_KERNEL); | |
851 | if (!vpd_buf) | |
852 | return; | |
853 | ||
854 | result = scsi_vpd_inquiry(sdev, vpd_buf, 0x83, vpd_len); | |
855 | if (result < 0) { | |
856 | kfree(vpd_buf); | |
857 | return; | |
858 | } | |
859 | if (result > vpd_len) { | |
860 | vpd_len = result; | |
861 | kfree(vpd_buf); | |
862 | goto retry_pg83; | |
863 | } | |
09e2b0b1 HR |
864 | mutex_lock(&sdev->inquiry_mutex); |
865 | orig_vpd_buf = sdev->vpd_pg83; | |
b3ae8780 | 866 | sdev->vpd_pg83_len = result; |
09e2b0b1 HR |
867 | rcu_assign_pointer(sdev->vpd_pg83, vpd_buf); |
868 | mutex_unlock(&sdev->inquiry_mutex); | |
869 | synchronize_rcu(); | |
870 | if (orig_vpd_buf) | |
871 | kfree(orig_vpd_buf); | |
b3ae8780 HR |
872 | } |
873 | } | |
874 | ||
3c6bdaea MP |
875 | /** |
876 | * scsi_report_opcode - Find out if a given command opcode is supported | |
877 | * @sdev: scsi device to query | |
878 | * @buffer: scratch buffer (must be at least 20 bytes long) | |
879 | * @len: length of buffer | |
880 | * @opcode: opcode for command to look up | |
881 | * | |
882 | * Uses the REPORT SUPPORTED OPERATION CODES to look up the given | |
66c28f97 MP |
883 | * opcode. Returns -EINVAL if RSOC fails, 0 if the command opcode is |
884 | * unsupported and 1 if the device claims to support the command. | |
3c6bdaea MP |
885 | */ |
886 | int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, | |
887 | unsigned int len, unsigned char opcode) | |
888 | { | |
889 | unsigned char cmd[16]; | |
890 | struct scsi_sense_hdr sshdr; | |
891 | int result; | |
892 | ||
893 | if (sdev->no_report_opcodes || sdev->scsi_level < SCSI_SPC_3) | |
66c28f97 | 894 | return -EINVAL; |
3c6bdaea MP |
895 | |
896 | memset(cmd, 0, 16); | |
897 | cmd[0] = MAINTENANCE_IN; | |
898 | cmd[1] = MI_REPORT_SUPPORTED_OPERATION_CODES; | |
899 | cmd[2] = 1; /* One command format */ | |
900 | cmd[3] = opcode; | |
901 | put_unaligned_be32(len, &cmd[6]); | |
902 | memset(buffer, 0, len); | |
903 | ||
904 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, len, | |
905 | &sshdr, 30 * HZ, 3, NULL); | |
906 | ||
907 | if (result && scsi_sense_valid(&sshdr) && | |
908 | sshdr.sense_key == ILLEGAL_REQUEST && | |
909 | (sshdr.asc == 0x20 || sshdr.asc == 0x24) && sshdr.ascq == 0x00) | |
66c28f97 | 910 | return -EINVAL; |
3c6bdaea MP |
911 | |
912 | if ((buffer[1] & 3) == 3) /* Command supported */ | |
913 | return 1; | |
914 | ||
915 | return 0; | |
916 | } | |
917 | EXPORT_SYMBOL(scsi_report_opcode); | |
918 | ||
1da177e4 | 919 | /** |
eb44820c | 920 | * scsi_device_get - get an additional reference to a scsi_device |
1da177e4 LT |
921 | * @sdev: device to get a reference to |
922 | * | |
eb44820c | 923 | * Description: Gets a reference to the scsi_device and increments the use count |
1da177e4 LT |
924 | * of the underlying LLDD module. You must hold host_lock of the |
925 | * parent Scsi_Host or already have a reference when calling this. | |
cff549e4 CH |
926 | * |
927 | * This will fail if a device is deleted or cancelled, or when the LLD module | |
928 | * is in the process of being unloaded. | |
1da177e4 LT |
929 | */ |
930 | int scsi_device_get(struct scsi_device *sdev) | |
931 | { | |
cff549e4 CH |
932 | if (sdev->sdev_state == SDEV_DEL || sdev->sdev_state == SDEV_CANCEL) |
933 | goto fail; | |
1da177e4 | 934 | if (!get_device(&sdev->sdev_gendev)) |
cff549e4 CH |
935 | goto fail; |
936 | if (!try_module_get(sdev->host->hostt->module)) | |
937 | goto fail_put_device; | |
1da177e4 | 938 | return 0; |
cff549e4 CH |
939 | |
940 | fail_put_device: | |
941 | put_device(&sdev->sdev_gendev); | |
942 | fail: | |
943 | return -ENXIO; | |
1da177e4 LT |
944 | } |
945 | EXPORT_SYMBOL(scsi_device_get); | |
946 | ||
947 | /** | |
948 | * scsi_device_put - release a reference to a scsi_device | |
949 | * @sdev: device to release a reference on. | |
950 | * | |
eb44820c RL |
951 | * Description: Release a reference to the scsi_device and decrements the use |
952 | * count of the underlying LLDD module. The device is freed once the last | |
1da177e4 LT |
953 | * user vanishes. |
954 | */ | |
955 | void scsi_device_put(struct scsi_device *sdev) | |
956 | { | |
dc4515ea | 957 | module_put(sdev->host->hostt->module); |
1da177e4 LT |
958 | put_device(&sdev->sdev_gendev); |
959 | } | |
960 | EXPORT_SYMBOL(scsi_device_put); | |
961 | ||
eb44820c | 962 | /* helper for shost_for_each_device, see that for documentation */ |
1da177e4 LT |
963 | struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost, |
964 | struct scsi_device *prev) | |
965 | { | |
966 | struct list_head *list = (prev ? &prev->siblings : &shost->__devices); | |
967 | struct scsi_device *next = NULL; | |
968 | unsigned long flags; | |
969 | ||
970 | spin_lock_irqsave(shost->host_lock, flags); | |
971 | while (list->next != &shost->__devices) { | |
972 | next = list_entry(list->next, struct scsi_device, siblings); | |
973 | /* skip devices that we can't get a reference to */ | |
974 | if (!scsi_device_get(next)) | |
975 | break; | |
976 | next = NULL; | |
977 | list = list->next; | |
978 | } | |
979 | spin_unlock_irqrestore(shost->host_lock, flags); | |
980 | ||
981 | if (prev) | |
982 | scsi_device_put(prev); | |
983 | return next; | |
984 | } | |
985 | EXPORT_SYMBOL(__scsi_iterate_devices); | |
986 | ||
987 | /** | |
988 | * starget_for_each_device - helper to walk all devices of a target | |
989 | * @starget: target whose devices we want to iterate over. | |
eb44820c RL |
990 | * @data: Opaque passed to each function call. |
991 | * @fn: Function to call on each device | |
1da177e4 | 992 | * |
522939d4 | 993 | * This traverses over each device of @starget. The devices have |
1da177e4 LT |
994 | * a reference that must be released by scsi_host_put when breaking |
995 | * out of the loop. | |
996 | */ | |
522939d4 | 997 | void starget_for_each_device(struct scsi_target *starget, void *data, |
1da177e4 LT |
998 | void (*fn)(struct scsi_device *, void *)) |
999 | { | |
1000 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
1001 | struct scsi_device *sdev; | |
1002 | ||
1003 | shost_for_each_device(sdev, shost) { | |
1004 | if ((sdev->channel == starget->channel) && | |
1005 | (sdev->id == starget->id)) | |
1006 | fn(sdev, data); | |
1007 | } | |
1008 | } | |
1009 | EXPORT_SYMBOL(starget_for_each_device); | |
1010 | ||
522939d4 | 1011 | /** |
14f501a4 | 1012 | * __starget_for_each_device - helper to walk all devices of a target (UNLOCKED) |
522939d4 | 1013 | * @starget: target whose devices we want to iterate over. |
14f501a4 RD |
1014 | * @data: parameter for callback @fn() |
1015 | * @fn: callback function that is invoked for each device | |
522939d4 MR |
1016 | * |
1017 | * This traverses over each device of @starget. It does _not_ | |
1018 | * take a reference on the scsi_device, so the whole loop must be | |
1019 | * protected by shost->host_lock. | |
1020 | * | |
1021 | * Note: The only reason why drivers would want to use this is because | |
1022 | * they need to access the device list in irq context. Otherwise you | |
1023 | * really want to use starget_for_each_device instead. | |
1024 | **/ | |
1025 | void __starget_for_each_device(struct scsi_target *starget, void *data, | |
1026 | void (*fn)(struct scsi_device *, void *)) | |
1027 | { | |
1028 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
1029 | struct scsi_device *sdev; | |
1030 | ||
1031 | __shost_for_each_device(sdev, shost) { | |
1032 | if ((sdev->channel == starget->channel) && | |
1033 | (sdev->id == starget->id)) | |
1034 | fn(sdev, data); | |
1035 | } | |
1036 | } | |
1037 | EXPORT_SYMBOL(__starget_for_each_device); | |
1038 | ||
1da177e4 LT |
1039 | /** |
1040 | * __scsi_device_lookup_by_target - find a device given the target (UNLOCKED) | |
1041 | * @starget: SCSI target pointer | |
1042 | * @lun: SCSI Logical Unit Number | |
1043 | * | |
eb44820c RL |
1044 | * Description: Looks up the scsi_device with the specified @lun for a given |
1045 | * @starget. The returned scsi_device does not have an additional | |
1da177e4 | 1046 | * reference. You must hold the host's host_lock over this call and |
32aeef60 HR |
1047 | * any access to the returned scsi_device. A scsi_device in state |
1048 | * SDEV_DEL is skipped. | |
1da177e4 | 1049 | * |
dc8875e1 | 1050 | * Note: The only reason why drivers should use this is because |
eb44820c | 1051 | * they need to access the device list in irq context. Otherwise you |
1da177e4 LT |
1052 | * really want to use scsi_device_lookup_by_target instead. |
1053 | **/ | |
1054 | struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget, | |
9cb78c16 | 1055 | u64 lun) |
1da177e4 LT |
1056 | { |
1057 | struct scsi_device *sdev; | |
1058 | ||
1059 | list_for_each_entry(sdev, &starget->devices, same_target_siblings) { | |
32aeef60 HR |
1060 | if (sdev->sdev_state == SDEV_DEL) |
1061 | continue; | |
1da177e4 LT |
1062 | if (sdev->lun ==lun) |
1063 | return sdev; | |
1064 | } | |
1065 | ||
1066 | return NULL; | |
1067 | } | |
1068 | EXPORT_SYMBOL(__scsi_device_lookup_by_target); | |
1069 | ||
1070 | /** | |
1071 | * scsi_device_lookup_by_target - find a device given the target | |
1072 | * @starget: SCSI target pointer | |
1073 | * @lun: SCSI Logical Unit Number | |
1074 | * | |
477e608c BZ |
1075 | * Description: Looks up the scsi_device with the specified @lun for a given |
1076 | * @starget. The returned scsi_device has an additional reference that | |
eb44820c | 1077 | * needs to be released with scsi_device_put once you're done with it. |
1da177e4 LT |
1078 | **/ |
1079 | struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget, | |
9cb78c16 | 1080 | u64 lun) |
1da177e4 LT |
1081 | { |
1082 | struct scsi_device *sdev; | |
1083 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
1084 | unsigned long flags; | |
1085 | ||
1086 | spin_lock_irqsave(shost->host_lock, flags); | |
1087 | sdev = __scsi_device_lookup_by_target(starget, lun); | |
1088 | if (sdev && scsi_device_get(sdev)) | |
1089 | sdev = NULL; | |
1090 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1091 | ||
1092 | return sdev; | |
1093 | } | |
1094 | EXPORT_SYMBOL(scsi_device_lookup_by_target); | |
1095 | ||
1096 | /** | |
eb44820c | 1097 | * __scsi_device_lookup - find a device given the host (UNLOCKED) |
1da177e4 LT |
1098 | * @shost: SCSI host pointer |
1099 | * @channel: SCSI channel (zero if only one channel) | |
eb44820c | 1100 | * @id: SCSI target number (physical unit number) |
1da177e4 LT |
1101 | * @lun: SCSI Logical Unit Number |
1102 | * | |
eb44820c RL |
1103 | * Description: Looks up the scsi_device with the specified @channel, @id, @lun |
1104 | * for a given host. The returned scsi_device does not have an additional | |
1105 | * reference. You must hold the host's host_lock over this call and any access | |
1106 | * to the returned scsi_device. | |
1da177e4 LT |
1107 | * |
1108 | * Note: The only reason why drivers would want to use this is because | |
eb44820c | 1109 | * they need to access the device list in irq context. Otherwise you |
1da177e4 LT |
1110 | * really want to use scsi_device_lookup instead. |
1111 | **/ | |
1112 | struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost, | |
9cb78c16 | 1113 | uint channel, uint id, u64 lun) |
1da177e4 LT |
1114 | { |
1115 | struct scsi_device *sdev; | |
1116 | ||
1117 | list_for_each_entry(sdev, &shost->__devices, siblings) { | |
1118 | if (sdev->channel == channel && sdev->id == id && | |
1119 | sdev->lun ==lun) | |
1120 | return sdev; | |
1121 | } | |
1122 | ||
1123 | return NULL; | |
1124 | } | |
1125 | EXPORT_SYMBOL(__scsi_device_lookup); | |
1126 | ||
1127 | /** | |
1128 | * scsi_device_lookup - find a device given the host | |
1129 | * @shost: SCSI host pointer | |
1130 | * @channel: SCSI channel (zero if only one channel) | |
1131 | * @id: SCSI target number (physical unit number) | |
1132 | * @lun: SCSI Logical Unit Number | |
1133 | * | |
eb44820c RL |
1134 | * Description: Looks up the scsi_device with the specified @channel, @id, @lun |
1135 | * for a given host. The returned scsi_device has an additional reference that | |
1136 | * needs to be released with scsi_device_put once you're done with it. | |
1da177e4 LT |
1137 | **/ |
1138 | struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost, | |
9cb78c16 | 1139 | uint channel, uint id, u64 lun) |
1da177e4 LT |
1140 | { |
1141 | struct scsi_device *sdev; | |
1142 | unsigned long flags; | |
1143 | ||
1144 | spin_lock_irqsave(shost->host_lock, flags); | |
1145 | sdev = __scsi_device_lookup(shost, channel, id, lun); | |
1146 | if (sdev && scsi_device_get(sdev)) | |
1147 | sdev = NULL; | |
1148 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1149 | ||
1150 | return sdev; | |
1151 | } | |
1152 | EXPORT_SYMBOL(scsi_device_lookup); | |
1153 | ||
1da177e4 LT |
1154 | MODULE_DESCRIPTION("SCSI core"); |
1155 | MODULE_LICENSE("GPL"); | |
1156 | ||
1157 | module_param(scsi_logging_level, int, S_IRUGO|S_IWUSR); | |
1158 | MODULE_PARM_DESC(scsi_logging_level, "a bit mask of logging levels"); | |
1159 | ||
24c20f10 CH |
1160 | #ifdef CONFIG_SCSI_MQ_DEFAULT |
1161 | bool scsi_use_blk_mq = true; | |
1162 | #else | |
d285203c | 1163 | bool scsi_use_blk_mq = false; |
24c20f10 | 1164 | #endif |
d285203c CH |
1165 | module_param_named(use_blk_mq, scsi_use_blk_mq, bool, S_IWUSR | S_IRUGO); |
1166 | ||
1da177e4 LT |
1167 | static int __init init_scsi(void) |
1168 | { | |
9bf09c23 | 1169 | int error; |
1da177e4 LT |
1170 | |
1171 | error = scsi_init_queue(); | |
1172 | if (error) | |
1173 | return error; | |
1174 | error = scsi_init_procfs(); | |
1175 | if (error) | |
1176 | goto cleanup_queue; | |
1177 | error = scsi_init_devinfo(); | |
1178 | if (error) | |
1179 | goto cleanup_procfs; | |
1180 | error = scsi_init_hosts(); | |
1181 | if (error) | |
1182 | goto cleanup_devlist; | |
1183 | error = scsi_init_sysctl(); | |
1184 | if (error) | |
1185 | goto cleanup_hosts; | |
1186 | error = scsi_sysfs_register(); | |
1187 | if (error) | |
1188 | goto cleanup_sysctl; | |
1189 | ||
84314fd4 JS |
1190 | scsi_netlink_init(); |
1191 | ||
1da177e4 LT |
1192 | printk(KERN_NOTICE "SCSI subsystem initialized\n"); |
1193 | return 0; | |
1194 | ||
1195 | cleanup_sysctl: | |
1196 | scsi_exit_sysctl(); | |
1197 | cleanup_hosts: | |
1198 | scsi_exit_hosts(); | |
1199 | cleanup_devlist: | |
1200 | scsi_exit_devinfo(); | |
1201 | cleanup_procfs: | |
1202 | scsi_exit_procfs(); | |
1203 | cleanup_queue: | |
1204 | scsi_exit_queue(); | |
1205 | printk(KERN_ERR "SCSI subsystem failed to initialize, error = %d\n", | |
1206 | -error); | |
1207 | return error; | |
1208 | } | |
1209 | ||
1210 | static void __exit exit_scsi(void) | |
1211 | { | |
84314fd4 | 1212 | scsi_netlink_exit(); |
1da177e4 LT |
1213 | scsi_sysfs_unregister(); |
1214 | scsi_exit_sysctl(); | |
1215 | scsi_exit_hosts(); | |
1216 | scsi_exit_devinfo(); | |
1da177e4 LT |
1217 | scsi_exit_procfs(); |
1218 | scsi_exit_queue(); | |
a4683487 | 1219 | async_unregister_domain(&scsi_sd_probe_domain); |
1da177e4 LT |
1220 | } |
1221 | ||
1222 | subsys_initcall(init_scsi); | |
1223 | module_exit(exit_scsi); |