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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 | ||
8a1cdc9c MW |
101 | /* NB: These are exposed through /proc/scsi/scsi and form part of the ABI. |
102 | * You may not alter any existing entry (although adding new ones is | |
103 | * encouraged once assigned by ANSI/INCITS T10 | |
104 | */ | |
4ff36718 | 105 | static const char *const scsi_device_types[] = { |
8a1cdc9c MW |
106 | "Direct-Access ", |
107 | "Sequential-Access", | |
1da177e4 LT |
108 | "Printer ", |
109 | "Processor ", | |
110 | "WORM ", | |
8a1cdc9c | 111 | "CD-ROM ", |
1da177e4 | 112 | "Scanner ", |
8a1cdc9c MW |
113 | "Optical Device ", |
114 | "Medium Changer ", | |
1da177e4 | 115 | "Communications ", |
4ff36718 MW |
116 | "ASC IT8 ", |
117 | "ASC IT8 ", | |
1da177e4 LT |
118 | "RAID ", |
119 | "Enclosure ", | |
8a1cdc9c | 120 | "Direct-Access-RBC", |
4ff36718 MW |
121 | "Optical card ", |
122 | "Bridge controller", | |
123 | "Object storage ", | |
124 | "Automation/Drive ", | |
c6e4f191 CH |
125 | "Security Manager ", |
126 | "Direct-Access-ZBC", | |
1da177e4 | 127 | }; |
4ff36718 | 128 | |
eb44820c RL |
129 | /** |
130 | * scsi_device_type - Return 17 char string indicating device type. | |
131 | * @type: type number to look up | |
132 | */ | |
133 | ||
4ff36718 MW |
134 | const char * scsi_device_type(unsigned type) |
135 | { | |
136 | if (type == 0x1e) | |
137 | return "Well-known LUN "; | |
138 | if (type == 0x1f) | |
139 | return "No Device "; | |
80c6e3c0 | 140 | if (type >= ARRAY_SIZE(scsi_device_types)) |
4ff36718 MW |
141 | return "Unknown "; |
142 | return scsi_device_types[type]; | |
143 | } | |
144 | ||
145 | EXPORT_SYMBOL(scsi_device_type); | |
1da177e4 | 146 | |
1da177e4 | 147 | struct scsi_host_cmd_pool { |
5b7f1680 JB |
148 | struct kmem_cache *cmd_slab; |
149 | struct kmem_cache *sense_slab; | |
150 | unsigned int users; | |
151 | char *cmd_name; | |
152 | char *sense_name; | |
153 | unsigned int slab_flags; | |
154 | gfp_t gfp_mask; | |
1da177e4 LT |
155 | }; |
156 | ||
157 | static struct scsi_host_cmd_pool scsi_cmd_pool = { | |
5b7f1680 JB |
158 | .cmd_name = "scsi_cmd_cache", |
159 | .sense_name = "scsi_sense_cache", | |
1da177e4 LT |
160 | .slab_flags = SLAB_HWCACHE_ALIGN, |
161 | }; | |
162 | ||
163 | static struct scsi_host_cmd_pool scsi_cmd_dma_pool = { | |
5b7f1680 JB |
164 | .cmd_name = "scsi_cmd_cache(DMA)", |
165 | .sense_name = "scsi_sense_cache(DMA)", | |
1da177e4 LT |
166 | .slab_flags = SLAB_HWCACHE_ALIGN|SLAB_CACHE_DMA, |
167 | .gfp_mask = __GFP_DMA, | |
168 | }; | |
169 | ||
0b950672 | 170 | static DEFINE_MUTEX(host_cmd_pool_mutex); |
1da177e4 | 171 | |
e507e30b | 172 | /** |
7c283341 CH |
173 | * scsi_host_free_command - internal function to release a command |
174 | * @shost: host to free the command for | |
e507e30b JB |
175 | * @cmd: command to release |
176 | * | |
177 | * the command must previously have been allocated by | |
7c283341 | 178 | * scsi_host_alloc_command. |
e507e30b JB |
179 | */ |
180 | static void | |
7c283341 | 181 | scsi_host_free_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd) |
e507e30b | 182 | { |
7c283341 CH |
183 | struct scsi_host_cmd_pool *pool = shost->cmd_pool; |
184 | ||
7027ad72 MP |
185 | if (cmd->prot_sdb) |
186 | kmem_cache_free(scsi_sdb_cache, cmd->prot_sdb); | |
e507e30b JB |
187 | kmem_cache_free(pool->sense_slab, cmd->sense_buffer); |
188 | kmem_cache_free(pool->cmd_slab, cmd); | |
189 | } | |
190 | ||
7027ad72 MP |
191 | /** |
192 | * scsi_host_alloc_command - internal function to allocate command | |
193 | * @shost: SCSI host whose pool to allocate from | |
194 | * @gfp_mask: mask for the allocation | |
195 | * | |
196 | * Returns a fully allocated command with sense buffer and protection | |
197 | * data buffer (where applicable) or NULL on failure | |
198 | */ | |
199 | static struct scsi_cmnd * | |
200 | scsi_host_alloc_command(struct Scsi_Host *shost, gfp_t gfp_mask) | |
201 | { | |
7c283341 | 202 | struct scsi_host_cmd_pool *pool = shost->cmd_pool; |
7027ad72 MP |
203 | struct scsi_cmnd *cmd; |
204 | ||
7c283341 | 205 | cmd = kmem_cache_zalloc(pool->cmd_slab, gfp_mask | pool->gfp_mask); |
7027ad72 | 206 | if (!cmd) |
7c283341 CH |
207 | goto fail; |
208 | ||
209 | cmd->sense_buffer = kmem_cache_alloc(pool->sense_slab, | |
210 | gfp_mask | pool->gfp_mask); | |
211 | if (!cmd->sense_buffer) | |
212 | goto fail_free_cmd; | |
7027ad72 MP |
213 | |
214 | if (scsi_host_get_prot(shost) >= SHOST_DIX_TYPE0_PROTECTION) { | |
215 | cmd->prot_sdb = kmem_cache_zalloc(scsi_sdb_cache, gfp_mask); | |
7c283341 CH |
216 | if (!cmd->prot_sdb) |
217 | goto fail_free_sense; | |
7027ad72 MP |
218 | } |
219 | ||
220 | return cmd; | |
7c283341 CH |
221 | |
222 | fail_free_sense: | |
223 | kmem_cache_free(pool->sense_slab, cmd->sense_buffer); | |
224 | fail_free_cmd: | |
225 | kmem_cache_free(pool->cmd_slab, cmd); | |
226 | fail: | |
227 | return NULL; | |
7027ad72 MP |
228 | } |
229 | ||
eb44820c RL |
230 | /** |
231 | * __scsi_get_command - Allocate a struct scsi_cmnd | |
232 | * @shost: host to transmit command | |
233 | * @gfp_mask: allocation mask | |
234 | * | |
235 | * Description: allocate a struct scsi_cmd from host's slab, recycling from the | |
236 | * host's free_list if necessary. | |
237 | */ | |
f1bea55d CH |
238 | static struct scsi_cmnd * |
239 | __scsi_get_command(struct Scsi_Host *shost, gfp_t gfp_mask) | |
1da177e4 | 240 | { |
b4c2554d | 241 | struct scsi_cmnd *cmd = scsi_host_alloc_command(shost, gfp_mask); |
164fc5dc | 242 | |
1da177e4 LT |
243 | if (unlikely(!cmd)) { |
244 | unsigned long flags; | |
245 | ||
246 | spin_lock_irqsave(&shost->free_list_lock, flags); | |
247 | if (likely(!list_empty(&shost->free_list))) { | |
248 | cmd = list_entry(shost->free_list.next, | |
249 | struct scsi_cmnd, list); | |
250 | list_del_init(&cmd->list); | |
251 | } | |
252 | spin_unlock_irqrestore(&shost->free_list_lock, flags); | |
de25deb1 FT |
253 | |
254 | if (cmd) { | |
b4c2554d MP |
255 | void *buf, *prot; |
256 | ||
de25deb1 | 257 | buf = cmd->sense_buffer; |
b4c2554d MP |
258 | prot = cmd->prot_sdb; |
259 | ||
de25deb1 | 260 | memset(cmd, 0, sizeof(*cmd)); |
b4c2554d | 261 | |
de25deb1 | 262 | cmd->sense_buffer = buf; |
b4c2554d | 263 | cmd->prot_sdb = prot; |
de25deb1 | 264 | } |
1da177e4 LT |
265 | } |
266 | ||
267 | return cmd; | |
268 | } | |
269 | ||
eb44820c RL |
270 | /** |
271 | * scsi_get_command - Allocate and setup a scsi command block | |
272 | * @dev: parent scsi device | |
273 | * @gfp_mask: allocator flags | |
1da177e4 LT |
274 | * |
275 | * Returns: The allocated scsi command structure. | |
276 | */ | |
c53033f6 | 277 | struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, gfp_t gfp_mask) |
1da177e4 | 278 | { |
04796336 CH |
279 | struct scsi_cmnd *cmd = __scsi_get_command(dev->host, gfp_mask); |
280 | unsigned long flags; | |
1da177e4 | 281 | |
04796336 | 282 | if (unlikely(cmd == NULL)) |
1da177e4 LT |
283 | return NULL; |
284 | ||
04796336 CH |
285 | cmd->device = dev; |
286 | INIT_LIST_HEAD(&cmd->list); | |
287 | INIT_DELAYED_WORK(&cmd->abort_work, scmd_eh_abort_handler); | |
288 | spin_lock_irqsave(&dev->list_lock, flags); | |
289 | list_add_tail(&cmd->list, &dev->cmd_list); | |
290 | spin_unlock_irqrestore(&dev->list_lock, flags); | |
291 | cmd->jiffies_at_alloc = jiffies; | |
1da177e4 | 292 | return cmd; |
b58d9154 | 293 | } |
1da177e4 | 294 | |
eb44820c RL |
295 | /** |
296 | * __scsi_put_command - Free a struct scsi_cmnd | |
297 | * @shost: dev->host | |
298 | * @cmd: Command to free | |
eb44820c | 299 | */ |
f1bea55d | 300 | static void __scsi_put_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd) |
b58d9154 FT |
301 | { |
302 | unsigned long flags; | |
303 | ||
b58d9154 | 304 | if (unlikely(list_empty(&shost->free_list))) { |
44b93b59 CH |
305 | spin_lock_irqsave(&shost->free_list_lock, flags); |
306 | if (list_empty(&shost->free_list)) { | |
307 | list_add(&cmd->list, &shost->free_list); | |
308 | cmd = NULL; | |
309 | } | |
310 | spin_unlock_irqrestore(&shost->free_list_lock, flags); | |
b58d9154 | 311 | } |
b58d9154 | 312 | |
e507e30b | 313 | if (likely(cmd != NULL)) |
7c283341 | 314 | scsi_host_free_command(shost, cmd); |
b58d9154 | 315 | } |
b58d9154 | 316 | |
eb44820c RL |
317 | /** |
318 | * scsi_put_command - Free a scsi command block | |
319 | * @cmd: command block to free | |
1da177e4 LT |
320 | * |
321 | * Returns: Nothing. | |
322 | * | |
323 | * Notes: The command must not belong to any lists. | |
324 | */ | |
325 | void scsi_put_command(struct scsi_cmnd *cmd) | |
326 | { | |
1da177e4 | 327 | unsigned long flags; |
b58d9154 | 328 | |
1da177e4 LT |
329 | /* serious error if the command hasn't come from a device list */ |
330 | spin_lock_irqsave(&cmd->device->list_lock, flags); | |
331 | BUG_ON(list_empty(&cmd->list)); | |
332 | list_del_init(&cmd->list); | |
b58d9154 | 333 | spin_unlock_irqrestore(&cmd->device->list_lock, flags); |
1da177e4 | 334 | |
fcc95a76 | 335 | BUG_ON(delayed_work_pending(&cmd->abort_work)); |
e494f6a7 | 336 | |
04796336 | 337 | __scsi_put_command(cmd->device->host, cmd); |
1da177e4 | 338 | } |
1da177e4 | 339 | |
89d9a567 CH |
340 | static struct scsi_host_cmd_pool * |
341 | scsi_find_host_cmd_pool(struct Scsi_Host *shost) | |
1da177e4 | 342 | { |
89d9a567 CH |
343 | if (shost->hostt->cmd_size) |
344 | return shost->hostt->cmd_pool; | |
345 | if (shost->unchecked_isa_dma) | |
346 | return &scsi_cmd_dma_pool; | |
347 | return &scsi_cmd_pool; | |
348 | } | |
349 | ||
350 | static void | |
351 | scsi_free_host_cmd_pool(struct scsi_host_cmd_pool *pool) | |
352 | { | |
353 | kfree(pool->sense_name); | |
354 | kfree(pool->cmd_name); | |
355 | kfree(pool); | |
356 | } | |
357 | ||
358 | static struct scsi_host_cmd_pool * | |
359 | scsi_alloc_host_cmd_pool(struct Scsi_Host *shost) | |
360 | { | |
361 | struct scsi_host_template *hostt = shost->hostt; | |
362 | struct scsi_host_cmd_pool *pool; | |
363 | ||
364 | pool = kzalloc(sizeof(*pool), GFP_KERNEL); | |
365 | if (!pool) | |
366 | return NULL; | |
367 | ||
884ffee0 JB |
368 | pool->cmd_name = kasprintf(GFP_KERNEL, "%s_cmd", hostt->proc_name); |
369 | pool->sense_name = kasprintf(GFP_KERNEL, "%s_sense", hostt->proc_name); | |
89d9a567 CH |
370 | if (!pool->cmd_name || !pool->sense_name) { |
371 | scsi_free_host_cmd_pool(pool); | |
372 | return NULL; | |
373 | } | |
374 | ||
375 | pool->slab_flags = SLAB_HWCACHE_ALIGN; | |
376 | if (shost->unchecked_isa_dma) { | |
377 | pool->slab_flags |= SLAB_CACHE_DMA; | |
378 | pool->gfp_mask = __GFP_DMA; | |
379 | } | |
380 | return pool; | |
381 | } | |
382 | ||
383 | static struct scsi_host_cmd_pool * | |
384 | scsi_get_host_cmd_pool(struct Scsi_Host *shost) | |
385 | { | |
386 | struct scsi_host_template *hostt = shost->hostt; | |
1c353f7d | 387 | struct scsi_host_cmd_pool *retval = NULL, *pool; |
89d9a567 CH |
388 | size_t cmd_size = sizeof(struct scsi_cmnd) + hostt->cmd_size; |
389 | ||
1da177e4 LT |
390 | /* |
391 | * Select a command slab for this host and create it if not | |
eb44820c | 392 | * yet existent. |
1da177e4 | 393 | */ |
0b950672 | 394 | mutex_lock(&host_cmd_pool_mutex); |
89d9a567 CH |
395 | pool = scsi_find_host_cmd_pool(shost); |
396 | if (!pool) { | |
397 | pool = scsi_alloc_host_cmd_pool(shost); | |
398 | if (!pool) | |
399 | goto out; | |
400 | } | |
401 | ||
1da177e4 | 402 | if (!pool->users) { |
89d9a567 | 403 | pool->cmd_slab = kmem_cache_create(pool->cmd_name, cmd_size, 0, |
5b7f1680 JB |
404 | pool->slab_flags, NULL); |
405 | if (!pool->cmd_slab) | |
89d9a567 | 406 | goto out_free_pool; |
5b7f1680 JB |
407 | |
408 | pool->sense_slab = kmem_cache_create(pool->sense_name, | |
409 | SCSI_SENSE_BUFFERSIZE, 0, | |
410 | pool->slab_flags, NULL); | |
89d9a567 CH |
411 | if (!pool->sense_slab) |
412 | goto out_free_slab; | |
1da177e4 LT |
413 | } |
414 | ||
415 | pool->users++; | |
1c353f7d | 416 | retval = pool; |
89d9a567 | 417 | out: |
0b950672 | 418 | mutex_unlock(&host_cmd_pool_mutex); |
1c353f7d | 419 | return retval; |
89d9a567 CH |
420 | |
421 | out_free_slab: | |
422 | kmem_cache_destroy(pool->cmd_slab); | |
423 | out_free_pool: | |
424 | if (hostt->cmd_size) | |
425 | scsi_free_host_cmd_pool(pool); | |
426 | goto out; | |
1c353f7d JB |
427 | } |
428 | ||
89d9a567 | 429 | static void scsi_put_host_cmd_pool(struct Scsi_Host *shost) |
1c353f7d | 430 | { |
89d9a567 | 431 | struct scsi_host_template *hostt = shost->hostt; |
1c353f7d | 432 | struct scsi_host_cmd_pool *pool; |
1da177e4 | 433 | |
1c353f7d | 434 | mutex_lock(&host_cmd_pool_mutex); |
89d9a567 CH |
435 | pool = scsi_find_host_cmd_pool(shost); |
436 | ||
1da177e4 | 437 | /* |
1c353f7d JB |
438 | * This may happen if a driver has a mismatched get and put |
439 | * of the command pool; the driver should be implicated in | |
440 | * the stack trace | |
1da177e4 | 441 | */ |
1c353f7d | 442 | BUG_ON(pool->users == 0); |
de25deb1 | 443 | |
5b7f1680 JB |
444 | if (!--pool->users) { |
445 | kmem_cache_destroy(pool->cmd_slab); | |
446 | kmem_cache_destroy(pool->sense_slab); | |
89d9a567 CH |
447 | if (hostt->cmd_size) |
448 | scsi_free_host_cmd_pool(pool); | |
5b7f1680 | 449 | } |
0b950672 | 450 | mutex_unlock(&host_cmd_pool_mutex); |
1c353f7d JB |
451 | } |
452 | ||
1c353f7d JB |
453 | /** |
454 | * scsi_setup_command_freelist - Setup the command freelist for a scsi host. | |
455 | * @shost: host to allocate the freelist for. | |
456 | * | |
457 | * Description: The command freelist protects against system-wide out of memory | |
458 | * deadlock by preallocating one SCSI command structure for each host, so the | |
459 | * system can always write to a swap file on a device associated with that host. | |
460 | * | |
461 | * Returns: Nothing. | |
462 | */ | |
463 | int scsi_setup_command_freelist(struct Scsi_Host *shost) | |
464 | { | |
1c353f7d | 465 | const gfp_t gfp_mask = shost->unchecked_isa_dma ? GFP_DMA : GFP_KERNEL; |
89d9a567 | 466 | struct scsi_cmnd *cmd; |
1c353f7d JB |
467 | |
468 | spin_lock_init(&shost->free_list_lock); | |
469 | INIT_LIST_HEAD(&shost->free_list); | |
470 | ||
89d9a567 | 471 | shost->cmd_pool = scsi_get_host_cmd_pool(shost); |
1c353f7d JB |
472 | if (!shost->cmd_pool) |
473 | return -ENOMEM; | |
474 | ||
475 | /* | |
476 | * Get one backup command for this host. | |
477 | */ | |
7027ad72 | 478 | cmd = scsi_host_alloc_command(shost, gfp_mask); |
1c353f7d | 479 | if (!cmd) { |
89d9a567 | 480 | scsi_put_host_cmd_pool(shost); |
61d7416a | 481 | shost->cmd_pool = NULL; |
1c353f7d JB |
482 | return -ENOMEM; |
483 | } | |
484 | list_add(&cmd->list, &shost->free_list); | |
485 | return 0; | |
1da177e4 LT |
486 | } |
487 | ||
eb44820c RL |
488 | /** |
489 | * scsi_destroy_command_freelist - Release the command freelist for a scsi host. | |
490 | * @shost: host whose freelist is going to be destroyed | |
1da177e4 LT |
491 | */ |
492 | void scsi_destroy_command_freelist(struct Scsi_Host *shost) | |
493 | { | |
61d7416a AB |
494 | /* |
495 | * If cmd_pool is NULL the free list was not initialized, so | |
496 | * do not attempt to release resources. | |
497 | */ | |
498 | if (!shost->cmd_pool) | |
499 | return; | |
500 | ||
1da177e4 LT |
501 | while (!list_empty(&shost->free_list)) { |
502 | struct scsi_cmnd *cmd; | |
503 | ||
504 | cmd = list_entry(shost->free_list.next, struct scsi_cmnd, list); | |
505 | list_del_init(&cmd->list); | |
7c283341 | 506 | scsi_host_free_command(shost, cmd); |
1da177e4 | 507 | } |
1c353f7d | 508 | shost->cmd_pool = NULL; |
89d9a567 | 509 | scsi_put_host_cmd_pool(shost); |
de25deb1 FT |
510 | } |
511 | ||
1da177e4 LT |
512 | #ifdef CONFIG_SCSI_LOGGING |
513 | void scsi_log_send(struct scsi_cmnd *cmd) | |
514 | { | |
515 | unsigned int level; | |
1da177e4 LT |
516 | |
517 | /* | |
518 | * If ML QUEUE log level is greater than or equal to: | |
519 | * | |
520 | * 1: nothing (match completion) | |
521 | * | |
522 | * 2: log opcode + command of all commands | |
523 | * | |
524 | * 3: same as 2 plus dump cmd address | |
525 | * | |
526 | * 4: same as 3 plus dump extra junk | |
527 | */ | |
528 | if (unlikely(scsi_logging_level)) { | |
529 | level = SCSI_LOG_LEVEL(SCSI_LOG_MLQUEUE_SHIFT, | |
530 | SCSI_LOG_MLQUEUE_BITS); | |
531 | if (level > 1) { | |
a4d04a4c | 532 | scmd_printk(KERN_INFO, cmd, "Send: "); |
1da177e4 LT |
533 | if (level > 2) |
534 | printk("0x%p ", cmd); | |
a4d04a4c | 535 | printk("\n"); |
1da177e4 LT |
536 | scsi_print_command(cmd); |
537 | if (level > 3) { | |
538 | printk(KERN_INFO "buffer = 0x%p, bufflen = %d," | |
7b3d9545 | 539 | " queuecommand 0x%p\n", |
a73e45b3 | 540 | scsi_sglist(cmd), scsi_bufflen(cmd), |
a4d04a4c | 541 | cmd->device->host->hostt->queuecommand); |
1da177e4 LT |
542 | |
543 | } | |
544 | } | |
545 | } | |
546 | } | |
547 | ||
548 | void scsi_log_completion(struct scsi_cmnd *cmd, int disposition) | |
549 | { | |
550 | unsigned int level; | |
1da177e4 LT |
551 | |
552 | /* | |
553 | * If ML COMPLETE log level is greater than or equal to: | |
554 | * | |
555 | * 1: log disposition, result, opcode + command, and conditionally | |
556 | * sense data for failures or non SUCCESS dispositions. | |
557 | * | |
558 | * 2: same as 1 but for all command completions. | |
559 | * | |
560 | * 3: same as 2 plus dump cmd address | |
561 | * | |
562 | * 4: same as 3 plus dump extra junk | |
563 | */ | |
564 | if (unlikely(scsi_logging_level)) { | |
565 | level = SCSI_LOG_LEVEL(SCSI_LOG_MLCOMPLETE_SHIFT, | |
566 | SCSI_LOG_MLCOMPLETE_BITS); | |
567 | if (((level > 0) && (cmd->result || disposition != SUCCESS)) || | |
568 | (level > 1)) { | |
a4d04a4c | 569 | scmd_printk(KERN_INFO, cmd, "Done: "); |
1da177e4 LT |
570 | if (level > 2) |
571 | printk("0x%p ", cmd); | |
572 | /* | |
573 | * Dump truncated values, so we usually fit within | |
574 | * 80 chars. | |
575 | */ | |
576 | switch (disposition) { | |
577 | case SUCCESS: | |
a4d04a4c | 578 | printk("SUCCESS\n"); |
1da177e4 LT |
579 | break; |
580 | case NEEDS_RETRY: | |
a4d04a4c | 581 | printk("RETRY\n"); |
1da177e4 LT |
582 | break; |
583 | case ADD_TO_MLQUEUE: | |
a4d04a4c | 584 | printk("MLQUEUE\n"); |
1da177e4 LT |
585 | break; |
586 | case FAILED: | |
a4d04a4c | 587 | printk("FAILED\n"); |
1da177e4 LT |
588 | break; |
589 | case TIMEOUT_ERROR: | |
590 | /* | |
591 | * If called via scsi_times_out. | |
592 | */ | |
a4d04a4c | 593 | printk("TIMEOUT\n"); |
1da177e4 LT |
594 | break; |
595 | default: | |
a4d04a4c | 596 | printk("UNKNOWN\n"); |
1da177e4 | 597 | } |
a4d04a4c | 598 | scsi_print_result(cmd); |
1da177e4 | 599 | scsi_print_command(cmd); |
a4d04a4c | 600 | if (status_byte(cmd->result) & CHECK_CONDITION) |
1da177e4 | 601 | scsi_print_sense("", cmd); |
a4d04a4c MP |
602 | if (level > 3) |
603 | scmd_printk(KERN_INFO, cmd, | |
604 | "scsi host busy %d failed %d\n", | |
74665016 | 605 | atomic_read(&cmd->device->host->host_busy), |
a4d04a4c | 606 | cmd->device->host->host_failed); |
1da177e4 LT |
607 | } |
608 | } | |
609 | } | |
610 | #endif | |
611 | ||
eb44820c RL |
612 | /** |
613 | * scsi_cmd_get_serial - Assign a serial number to a command | |
614 | * @host: the scsi host | |
615 | * @cmd: command to assign serial number to | |
616 | * | |
617 | * Description: a serial number identifies a request for error recovery | |
1da177e4 LT |
618 | * and debugging purposes. Protected by the Host_Lock of host. |
619 | */ | |
f281233d | 620 | void scsi_cmd_get_serial(struct Scsi_Host *host, struct scsi_cmnd *cmd) |
1da177e4 LT |
621 | { |
622 | cmd->serial_number = host->cmd_serial_number++; | |
623 | if (cmd->serial_number == 0) | |
624 | cmd->serial_number = host->cmd_serial_number++; | |
1da177e4 | 625 | } |
f281233d | 626 | EXPORT_SYMBOL(scsi_cmd_get_serial); |
1da177e4 | 627 | |
eb44820c RL |
628 | /** |
629 | * scsi_dispatch_command - Dispatch a command to the low-level driver. | |
630 | * @cmd: command block we are dispatching. | |
1da177e4 | 631 | * |
eb44820c RL |
632 | * Return: nonzero return request was rejected and device's queue needs to be |
633 | * plugged. | |
1da177e4 LT |
634 | */ |
635 | int scsi_dispatch_cmd(struct scsi_cmnd *cmd) | |
636 | { | |
637 | struct Scsi_Host *host = cmd->device->host; | |
1da177e4 LT |
638 | int rtn = 0; |
639 | ||
242f9dcb JA |
640 | atomic_inc(&cmd->device->iorequest_cnt); |
641 | ||
1da177e4 LT |
642 | /* check if the device is still usable */ |
643 | if (unlikely(cmd->device->sdev_state == SDEV_DEL)) { | |
644 | /* in SDEV_DEL we error all commands. DID_NO_CONNECT | |
645 | * returns an immediate error upwards, and signals | |
646 | * that the device is no longer present */ | |
647 | cmd->result = DID_NO_CONNECT << 16; | |
d0d3bbf9 | 648 | goto done; |
1da177e4 LT |
649 | } |
650 | ||
0f1d87a2 JB |
651 | /* Check to see if the scsi lld made this device blocked. */ |
652 | if (unlikely(scsi_device_blocked(cmd->device))) { | |
91921e01 | 653 | /* |
0f1d87a2 JB |
654 | * in blocked state, the command is just put back on |
655 | * the device queue. The suspend state has already | |
656 | * blocked the queue so future requests should not | |
657 | * occur until the device transitions out of the | |
658 | * suspend state. | |
1da177e4 | 659 | */ |
91921e01 HR |
660 | SCSI_LOG_MLQUEUE(3, scmd_printk(KERN_INFO, cmd, |
661 | "queuecommand : device blocked\n")); | |
d0d3bbf9 | 662 | return SCSI_MLQUEUE_DEVICE_BUSY; |
1da177e4 LT |
663 | } |
664 | ||
91921e01 | 665 | /* |
1da177e4 LT |
666 | * If SCSI-2 or lower, store the LUN value in cmnd. |
667 | */ | |
4d7db04a JB |
668 | if (cmd->device->scsi_level <= SCSI_2 && |
669 | cmd->device->scsi_level != SCSI_UNKNOWN) { | |
1da177e4 LT |
670 | cmd->cmnd[1] = (cmd->cmnd[1] & 0x1f) | |
671 | (cmd->device->lun << 5 & 0xe0); | |
672 | } | |
673 | ||
1da177e4 LT |
674 | scsi_log_send(cmd); |
675 | ||
1da177e4 LT |
676 | /* |
677 | * Before we queue this command, check if the command | |
678 | * length exceeds what the host adapter can handle. | |
679 | */ | |
db4742dd | 680 | if (cmd->cmd_len > cmd->device->host->max_cmd_len) { |
91921e01 HR |
681 | SCSI_LOG_MLQUEUE(3, scmd_printk(KERN_INFO, cmd, |
682 | "queuecommand : command too long. " | |
db4742dd BH |
683 | "cdb_size=%d host->max_cmd_len=%d\n", |
684 | cmd->cmd_len, cmd->device->host->max_cmd_len)); | |
1da177e4 | 685 | cmd->result = (DID_ABORT << 16); |
d0d3bbf9 | 686 | goto done; |
1da177e4 LT |
687 | } |
688 | ||
d2c9d9ea | 689 | if (unlikely(host->shost_state == SHOST_DEL)) { |
1da177e4 | 690 | cmd->result = (DID_NO_CONNECT << 16); |
d0d3bbf9 CH |
691 | goto done; |
692 | ||
1da177e4 | 693 | } |
f281233d | 694 | |
d0d3bbf9 | 695 | trace_scsi_dispatch_cmd_start(cmd); |
d0d3bbf9 | 696 | rtn = host->hostt->queuecommand(host, cmd); |
1da177e4 | 697 | if (rtn) { |
bf816235 | 698 | trace_scsi_dispatch_cmd_error(cmd, rtn); |
f0c0a376 MC |
699 | if (rtn != SCSI_MLQUEUE_DEVICE_BUSY && |
700 | rtn != SCSI_MLQUEUE_TARGET_BUSY) | |
701 | rtn = SCSI_MLQUEUE_HOST_BUSY; | |
702 | ||
91921e01 HR |
703 | SCSI_LOG_MLQUEUE(3, scmd_printk(KERN_INFO, cmd, |
704 | "queuecommand : request rejected\n")); | |
1da177e4 LT |
705 | } |
706 | ||
1da177e4 | 707 | return rtn; |
d0d3bbf9 | 708 | done: |
3b5382c4 | 709 | cmd->scsi_done(cmd); |
d0d3bbf9 | 710 | return 0; |
1da177e4 LT |
711 | } |
712 | ||
eb44820c RL |
713 | /** |
714 | * scsi_finish_command - cleanup and pass command back to upper layer | |
715 | * @cmd: the command | |
1da177e4 | 716 | * |
eb44820c | 717 | * Description: Pass command off to upper layer for finishing of I/O |
1da177e4 LT |
718 | * request, waking processes that are waiting on results, |
719 | * etc. | |
720 | */ | |
721 | void scsi_finish_command(struct scsi_cmnd *cmd) | |
722 | { | |
723 | struct scsi_device *sdev = cmd->device; | |
f0c0a376 | 724 | struct scsi_target *starget = scsi_target(sdev); |
1da177e4 | 725 | struct Scsi_Host *shost = sdev->host; |
7b3d9545 LT |
726 | struct scsi_driver *drv; |
727 | unsigned int good_bytes; | |
1da177e4 LT |
728 | |
729 | scsi_device_unbusy(sdev); | |
730 | ||
cd9070c9 CH |
731 | /* |
732 | * Clear the flags that say that the device/target/host is no longer | |
733 | * capable of accepting new commands. | |
734 | */ | |
735 | if (atomic_read(&shost->host_blocked)) | |
736 | atomic_set(&shost->host_blocked, 0); | |
737 | if (atomic_read(&starget->target_blocked)) | |
738 | atomic_set(&starget->target_blocked, 0); | |
739 | if (atomic_read(&sdev->device_blocked)) | |
740 | atomic_set(&sdev->device_blocked, 0); | |
1da177e4 LT |
741 | |
742 | /* | |
743 | * If we have valid sense information, then some kind of recovery | |
744 | * must have taken place. Make a note of this. | |
745 | */ | |
746 | if (SCSI_SENSE_VALID(cmd)) | |
747 | cmd->result |= (DRIVER_SENSE << 24); | |
748 | ||
3bf743e7 JG |
749 | SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev, |
750 | "Notifying upper driver of completion " | |
751 | "(result %x)\n", cmd->result)); | |
1da177e4 | 752 | |
f18573ab | 753 | good_bytes = scsi_bufflen(cmd); |
7b3d9545 | 754 | if (cmd->request->cmd_type != REQ_TYPE_BLOCK_PC) { |
427e59f0 | 755 | int old_good_bytes = good_bytes; |
7b3d9545 LT |
756 | drv = scsi_cmd_to_driver(cmd); |
757 | if (drv->done) | |
758 | good_bytes = drv->done(cmd); | |
427e59f0 JB |
759 | /* |
760 | * USB may not give sense identifying bad sector and | |
761 | * simply return a residue instead, so subtract off the | |
762 | * residue if drv->done() error processing indicates no | |
763 | * change to the completion length. | |
764 | */ | |
765 | if (good_bytes == old_good_bytes) | |
766 | good_bytes -= scsi_get_resid(cmd); | |
7b3d9545 LT |
767 | } |
768 | scsi_io_completion(cmd, good_bytes); | |
1da177e4 | 769 | } |
1da177e4 | 770 | |
eb44820c RL |
771 | /** |
772 | * scsi_adjust_queue_depth - Let low level drivers change a device's queue depth | |
773 | * @sdev: SCSI Device in question | |
774 | * @tagged: Do we use tagged queueing (non-0) or do we treat | |
775 | * this device as an untagged device (0) | |
776 | * @tags: Number of tags allowed if tagged queueing enabled, | |
777 | * or number of commands the low level driver can | |
778 | * queue up in non-tagged mode (as per cmd_per_lun). | |
1da177e4 LT |
779 | * |
780 | * Returns: Nothing | |
781 | * | |
782 | * Lock Status: None held on entry | |
783 | * | |
784 | * Notes: Low level drivers may call this at any time and we will do | |
785 | * the right thing depending on whether or not the device is | |
786 | * currently active and whether or not it even has the | |
787 | * command blocks built yet. | |
788 | */ | |
789 | void scsi_adjust_queue_depth(struct scsi_device *sdev, int tagged, int tags) | |
790 | { | |
791 | unsigned long flags; | |
792 | ||
793 | /* | |
794 | * refuse to set tagged depth to an unworkable size | |
795 | */ | |
796 | if (tags <= 0) | |
797 | return; | |
798 | ||
799 | spin_lock_irqsave(sdev->request_queue->queue_lock, flags); | |
800 | ||
885ace9e MC |
801 | /* |
802 | * Check to see if the queue is managed by the block layer. | |
803 | * If it is, and we fail to adjust the depth, exit. | |
804 | * | |
805 | * Do not resize the tag map if it is a host wide share bqt, | |
806 | * because the size should be the hosts's can_queue. If there | |
807 | * is more IO than the LLD's can_queue (so there are not enuogh | |
808 | * tags) request_fn's host queue ready check will handle it. | |
809 | */ | |
d285203c | 810 | if (!shost_use_blk_mq(sdev->host) && !sdev->host->bqt) { |
885ace9e MC |
811 | if (blk_queue_tagged(sdev->request_queue) && |
812 | blk_queue_resize_tags(sdev->request_queue, tags) != 0) | |
813 | goto out; | |
814 | } | |
1da177e4 LT |
815 | |
816 | sdev->queue_depth = tags; | |
817 | switch (tagged) { | |
cb23f912 DG |
818 | case 0: |
819 | sdev->ordered_tags = 0; | |
820 | sdev->simple_tags = 0; | |
821 | break; | |
1da177e4 LT |
822 | case MSG_ORDERED_TAG: |
823 | sdev->ordered_tags = 1; | |
824 | sdev->simple_tags = 1; | |
825 | break; | |
826 | case MSG_SIMPLE_TAG: | |
827 | sdev->ordered_tags = 0; | |
828 | sdev->simple_tags = 1; | |
829 | break; | |
830 | default: | |
cb23f912 DG |
831 | sdev->ordered_tags = 0; |
832 | sdev->simple_tags = 0; | |
9ccfc756 JB |
833 | sdev_printk(KERN_WARNING, sdev, |
834 | "scsi_adjust_queue_depth, bad queue type, " | |
835 | "disabled\n"); | |
1da177e4 LT |
836 | } |
837 | out: | |
838 | spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); | |
839 | } | |
840 | EXPORT_SYMBOL(scsi_adjust_queue_depth); | |
841 | ||
eb44820c RL |
842 | /** |
843 | * scsi_track_queue_full - track QUEUE_FULL events to adjust queue depth | |
844 | * @sdev: SCSI Device in question | |
845 | * @depth: Current number of outstanding SCSI commands on this device, | |
846 | * not counting the one returned as QUEUE_FULL. | |
1da177e4 | 847 | * |
eb44820c | 848 | * Description: This function will track successive QUEUE_FULL events on a |
1da177e4 LT |
849 | * specific SCSI device to determine if and when there is a |
850 | * need to adjust the queue depth on the device. | |
851 | * | |
eb44820c | 852 | * Returns: 0 - No change needed, >0 - Adjust queue depth to this new depth, |
1da177e4 LT |
853 | * -1 - Drop back to untagged operation using host->cmd_per_lun |
854 | * as the untagged command depth | |
855 | * | |
856 | * Lock Status: None held on entry | |
857 | * | |
858 | * Notes: Low level drivers may call this at any time and we will do | |
859 | * "The Right Thing." We are interrupt context safe. | |
860 | */ | |
861 | int scsi_track_queue_full(struct scsi_device *sdev, int depth) | |
862 | { | |
4a84067d VD |
863 | |
864 | /* | |
865 | * Don't let QUEUE_FULLs on the same | |
866 | * jiffies count, they could all be from | |
867 | * same event. | |
868 | */ | |
869 | if ((jiffies >> 4) == (sdev->last_queue_full_time >> 4)) | |
1da177e4 LT |
870 | return 0; |
871 | ||
4a84067d | 872 | sdev->last_queue_full_time = jiffies; |
1da177e4 LT |
873 | if (sdev->last_queue_full_depth != depth) { |
874 | sdev->last_queue_full_count = 1; | |
875 | sdev->last_queue_full_depth = depth; | |
876 | } else { | |
877 | sdev->last_queue_full_count++; | |
878 | } | |
879 | ||
880 | if (sdev->last_queue_full_count <= 10) | |
881 | return 0; | |
882 | if (sdev->last_queue_full_depth < 8) { | |
883 | /* Drop back to untagged */ | |
884 | scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); | |
885 | return -1; | |
886 | } | |
887 | ||
888 | if (sdev->ordered_tags) | |
889 | scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, depth); | |
890 | else | |
891 | scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); | |
892 | return depth; | |
893 | } | |
894 | EXPORT_SYMBOL(scsi_track_queue_full); | |
895 | ||
881a256d MW |
896 | /** |
897 | * scsi_vpd_inquiry - Request a device provide us with a VPD page | |
898 | * @sdev: The device to ask | |
899 | * @buffer: Where to put the result | |
900 | * @page: Which Vital Product Data to return | |
901 | * @len: The length of the buffer | |
902 | * | |
903 | * This is an internal helper function. You probably want to use | |
904 | * scsi_get_vpd_page instead. | |
905 | * | |
bc8945df | 906 | * Returns size of the vpd page on success or a negative error number. |
881a256d MW |
907 | */ |
908 | static int scsi_vpd_inquiry(struct scsi_device *sdev, unsigned char *buffer, | |
909 | u8 page, unsigned len) | |
910 | { | |
911 | int result; | |
912 | unsigned char cmd[16]; | |
913 | ||
bc8945df HR |
914 | if (len < 4) |
915 | return -EINVAL; | |
916 | ||
881a256d MW |
917 | cmd[0] = INQUIRY; |
918 | cmd[1] = 1; /* EVPD */ | |
919 | cmd[2] = page; | |
920 | cmd[3] = len >> 8; | |
921 | cmd[4] = len & 0xff; | |
922 | cmd[5] = 0; /* Control byte */ | |
923 | ||
924 | /* | |
925 | * I'm not convinced we need to try quite this hard to get VPD, but | |
926 | * all the existing users tried this hard. | |
927 | */ | |
928 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, | |
95a3639e | 929 | len, NULL, 30 * HZ, 3, NULL); |
881a256d | 930 | if (result) |
bc8945df | 931 | return -EIO; |
881a256d MW |
932 | |
933 | /* Sanity check that we got the page back that we asked for */ | |
934 | if (buffer[1] != page) | |
935 | return -EIO; | |
936 | ||
bc8945df | 937 | return get_unaligned_be16(&buffer[2]) + 4; |
881a256d MW |
938 | } |
939 | ||
940 | /** | |
941 | * scsi_get_vpd_page - Get Vital Product Data from a SCSI device | |
942 | * @sdev: The device to ask | |
943 | * @page: Which Vital Product Data to return | |
786f8ba2 RD |
944 | * @buf: where to store the VPD |
945 | * @buf_len: number of bytes in the VPD buffer area | |
881a256d MW |
946 | * |
947 | * SCSI devices may optionally supply Vital Product Data. Each 'page' | |
948 | * of VPD is defined in the appropriate SCSI document (eg SPC, SBC). | |
949 | * If the device supports this VPD page, this routine returns a pointer | |
950 | * to a buffer containing the data from that page. The caller is | |
951 | * responsible for calling kfree() on this pointer when it is no longer | |
952 | * needed. If we cannot retrieve the VPD page this routine returns %NULL. | |
953 | */ | |
e3deec09 JB |
954 | int scsi_get_vpd_page(struct scsi_device *sdev, u8 page, unsigned char *buf, |
955 | int buf_len) | |
881a256d MW |
956 | { |
957 | int i, result; | |
881a256d | 958 | |
7562523e MP |
959 | if (sdev->skip_vpd_pages) |
960 | goto fail; | |
961 | ||
881a256d | 962 | /* Ask for all the pages supported by this device */ |
e3deec09 | 963 | result = scsi_vpd_inquiry(sdev, buf, 0, buf_len); |
bc8945df | 964 | if (result < 4) |
881a256d MW |
965 | goto fail; |
966 | ||
967 | /* If the user actually wanted this page, we can skip the rest */ | |
968 | if (page == 0) | |
16d3ea26 | 969 | return 0; |
881a256d | 970 | |
bc8945df HR |
971 | for (i = 4; i < min(result, buf_len); i++) |
972 | if (buf[i] == page) | |
881a256d | 973 | goto found; |
e3deec09 | 974 | |
bc8945df | 975 | if (i < result && i >= buf_len) |
e3deec09 JB |
976 | /* ran off the end of the buffer, give us benefit of doubt */ |
977 | goto found; | |
881a256d MW |
978 | /* The device claims it doesn't support the requested page */ |
979 | goto fail; | |
980 | ||
981 | found: | |
e3deec09 | 982 | result = scsi_vpd_inquiry(sdev, buf, page, buf_len); |
bc8945df | 983 | if (result < 0) |
881a256d MW |
984 | goto fail; |
985 | ||
e3deec09 | 986 | return 0; |
881a256d MW |
987 | |
988 | fail: | |
e3deec09 | 989 | return -EINVAL; |
881a256d MW |
990 | } |
991 | EXPORT_SYMBOL_GPL(scsi_get_vpd_page); | |
992 | ||
b3ae8780 HR |
993 | /** |
994 | * scsi_attach_vpd - Attach Vital Product Data to a SCSI device structure | |
995 | * @sdev: The device to ask | |
996 | * | |
997 | * Attach the 'Device Identification' VPD page (0x83) and the | |
998 | * 'Unit Serial Number' VPD page (0x80) to a SCSI device | |
999 | * structure. This information can be used to identify the device | |
1000 | * uniquely. | |
1001 | */ | |
1002 | void scsi_attach_vpd(struct scsi_device *sdev) | |
1003 | { | |
1004 | int result, i; | |
1005 | int vpd_len = SCSI_VPD_PG_LEN; | |
1006 | int pg80_supported = 0; | |
1007 | int pg83_supported = 0; | |
1008 | unsigned char *vpd_buf; | |
1009 | ||
1010 | if (sdev->skip_vpd_pages) | |
1011 | return; | |
1012 | retry_pg0: | |
1013 | vpd_buf = kmalloc(vpd_len, GFP_KERNEL); | |
1014 | if (!vpd_buf) | |
1015 | return; | |
1016 | ||
1017 | /* Ask for all the pages supported by this device */ | |
1018 | result = scsi_vpd_inquiry(sdev, vpd_buf, 0, vpd_len); | |
1019 | if (result < 0) { | |
1020 | kfree(vpd_buf); | |
1021 | return; | |
1022 | } | |
1023 | if (result > vpd_len) { | |
1024 | vpd_len = result; | |
1025 | kfree(vpd_buf); | |
1026 | goto retry_pg0; | |
1027 | } | |
1028 | ||
1029 | for (i = 4; i < result; i++) { | |
1030 | if (vpd_buf[i] == 0x80) | |
1031 | pg80_supported = 1; | |
1032 | if (vpd_buf[i] == 0x83) | |
1033 | pg83_supported = 1; | |
1034 | } | |
1035 | kfree(vpd_buf); | |
1036 | vpd_len = SCSI_VPD_PG_LEN; | |
1037 | ||
1038 | if (pg80_supported) { | |
1039 | retry_pg80: | |
1040 | vpd_buf = kmalloc(vpd_len, GFP_KERNEL); | |
1041 | if (!vpd_buf) | |
1042 | return; | |
1043 | ||
1044 | result = scsi_vpd_inquiry(sdev, vpd_buf, 0x80, vpd_len); | |
1045 | if (result < 0) { | |
1046 | kfree(vpd_buf); | |
1047 | return; | |
1048 | } | |
1049 | if (result > vpd_len) { | |
1050 | vpd_len = result; | |
1051 | kfree(vpd_buf); | |
1052 | goto retry_pg80; | |
1053 | } | |
1054 | sdev->vpd_pg80_len = result; | |
1055 | sdev->vpd_pg80 = vpd_buf; | |
1056 | vpd_len = SCSI_VPD_PG_LEN; | |
1057 | } | |
1058 | ||
1059 | if (pg83_supported) { | |
1060 | retry_pg83: | |
1061 | vpd_buf = kmalloc(vpd_len, GFP_KERNEL); | |
1062 | if (!vpd_buf) | |
1063 | return; | |
1064 | ||
1065 | result = scsi_vpd_inquiry(sdev, vpd_buf, 0x83, vpd_len); | |
1066 | if (result < 0) { | |
1067 | kfree(vpd_buf); | |
1068 | return; | |
1069 | } | |
1070 | if (result > vpd_len) { | |
1071 | vpd_len = result; | |
1072 | kfree(vpd_buf); | |
1073 | goto retry_pg83; | |
1074 | } | |
1075 | sdev->vpd_pg83_len = result; | |
1076 | sdev->vpd_pg83 = vpd_buf; | |
1077 | } | |
1078 | } | |
1079 | ||
3c6bdaea MP |
1080 | /** |
1081 | * scsi_report_opcode - Find out if a given command opcode is supported | |
1082 | * @sdev: scsi device to query | |
1083 | * @buffer: scratch buffer (must be at least 20 bytes long) | |
1084 | * @len: length of buffer | |
1085 | * @opcode: opcode for command to look up | |
1086 | * | |
1087 | * Uses the REPORT SUPPORTED OPERATION CODES to look up the given | |
66c28f97 MP |
1088 | * opcode. Returns -EINVAL if RSOC fails, 0 if the command opcode is |
1089 | * unsupported and 1 if the device claims to support the command. | |
3c6bdaea MP |
1090 | */ |
1091 | int scsi_report_opcode(struct scsi_device *sdev, unsigned char *buffer, | |
1092 | unsigned int len, unsigned char opcode) | |
1093 | { | |
1094 | unsigned char cmd[16]; | |
1095 | struct scsi_sense_hdr sshdr; | |
1096 | int result; | |
1097 | ||
1098 | if (sdev->no_report_opcodes || sdev->scsi_level < SCSI_SPC_3) | |
66c28f97 | 1099 | return -EINVAL; |
3c6bdaea MP |
1100 | |
1101 | memset(cmd, 0, 16); | |
1102 | cmd[0] = MAINTENANCE_IN; | |
1103 | cmd[1] = MI_REPORT_SUPPORTED_OPERATION_CODES; | |
1104 | cmd[2] = 1; /* One command format */ | |
1105 | cmd[3] = opcode; | |
1106 | put_unaligned_be32(len, &cmd[6]); | |
1107 | memset(buffer, 0, len); | |
1108 | ||
1109 | result = scsi_execute_req(sdev, cmd, DMA_FROM_DEVICE, buffer, len, | |
1110 | &sshdr, 30 * HZ, 3, NULL); | |
1111 | ||
1112 | if (result && scsi_sense_valid(&sshdr) && | |
1113 | sshdr.sense_key == ILLEGAL_REQUEST && | |
1114 | (sshdr.asc == 0x20 || sshdr.asc == 0x24) && sshdr.ascq == 0x00) | |
66c28f97 | 1115 | return -EINVAL; |
3c6bdaea MP |
1116 | |
1117 | if ((buffer[1] & 3) == 3) /* Command supported */ | |
1118 | return 1; | |
1119 | ||
1120 | return 0; | |
1121 | } | |
1122 | EXPORT_SYMBOL(scsi_report_opcode); | |
1123 | ||
1da177e4 | 1124 | /** |
eb44820c | 1125 | * scsi_device_get - get an additional reference to a scsi_device |
1da177e4 LT |
1126 | * @sdev: device to get a reference to |
1127 | * | |
eb44820c | 1128 | * Description: Gets a reference to the scsi_device and increments the use count |
1da177e4 LT |
1129 | * of the underlying LLDD module. You must hold host_lock of the |
1130 | * parent Scsi_Host or already have a reference when calling this. | |
1131 | */ | |
1132 | int scsi_device_get(struct scsi_device *sdev) | |
1133 | { | |
85b6c720 | 1134 | if (sdev->sdev_state == SDEV_DEL) |
1da177e4 LT |
1135 | return -ENXIO; |
1136 | if (!get_device(&sdev->sdev_gendev)) | |
1137 | return -ENXIO; | |
85b6c720 JB |
1138 | /* We can fail this if we're doing SCSI operations |
1139 | * from module exit (like cache flush) */ | |
1140 | try_module_get(sdev->host->hostt->module); | |
1141 | ||
1da177e4 LT |
1142 | return 0; |
1143 | } | |
1144 | EXPORT_SYMBOL(scsi_device_get); | |
1145 | ||
1146 | /** | |
1147 | * scsi_device_put - release a reference to a scsi_device | |
1148 | * @sdev: device to release a reference on. | |
1149 | * | |
eb44820c RL |
1150 | * Description: Release a reference to the scsi_device and decrements the use |
1151 | * count of the underlying LLDD module. The device is freed once the last | |
1da177e4 LT |
1152 | * user vanishes. |
1153 | */ | |
1154 | void scsi_device_put(struct scsi_device *sdev) | |
1155 | { | |
504fb37a | 1156 | #ifdef CONFIG_MODULE_UNLOAD |
f479ab87 JB |
1157 | struct module *module = sdev->host->hostt->module; |
1158 | ||
85b6c720 JB |
1159 | /* The module refcount will be zero if scsi_device_get() |
1160 | * was called from a module removal routine */ | |
f479ab87 JB |
1161 | if (module && module_refcount(module) != 0) |
1162 | module_put(module); | |
a506b44b | 1163 | #endif |
1da177e4 LT |
1164 | put_device(&sdev->sdev_gendev); |
1165 | } | |
1166 | EXPORT_SYMBOL(scsi_device_put); | |
1167 | ||
eb44820c | 1168 | /* helper for shost_for_each_device, see that for documentation */ |
1da177e4 LT |
1169 | struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost, |
1170 | struct scsi_device *prev) | |
1171 | { | |
1172 | struct list_head *list = (prev ? &prev->siblings : &shost->__devices); | |
1173 | struct scsi_device *next = NULL; | |
1174 | unsigned long flags; | |
1175 | ||
1176 | spin_lock_irqsave(shost->host_lock, flags); | |
1177 | while (list->next != &shost->__devices) { | |
1178 | next = list_entry(list->next, struct scsi_device, siblings); | |
1179 | /* skip devices that we can't get a reference to */ | |
1180 | if (!scsi_device_get(next)) | |
1181 | break; | |
1182 | next = NULL; | |
1183 | list = list->next; | |
1184 | } | |
1185 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1186 | ||
1187 | if (prev) | |
1188 | scsi_device_put(prev); | |
1189 | return next; | |
1190 | } | |
1191 | EXPORT_SYMBOL(__scsi_iterate_devices); | |
1192 | ||
1193 | /** | |
1194 | * starget_for_each_device - helper to walk all devices of a target | |
1195 | * @starget: target whose devices we want to iterate over. | |
eb44820c RL |
1196 | * @data: Opaque passed to each function call. |
1197 | * @fn: Function to call on each device | |
1da177e4 | 1198 | * |
522939d4 | 1199 | * This traverses over each device of @starget. The devices have |
1da177e4 LT |
1200 | * a reference that must be released by scsi_host_put when breaking |
1201 | * out of the loop. | |
1202 | */ | |
522939d4 | 1203 | void starget_for_each_device(struct scsi_target *starget, void *data, |
1da177e4 LT |
1204 | void (*fn)(struct scsi_device *, void *)) |
1205 | { | |
1206 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
1207 | struct scsi_device *sdev; | |
1208 | ||
1209 | shost_for_each_device(sdev, shost) { | |
1210 | if ((sdev->channel == starget->channel) && | |
1211 | (sdev->id == starget->id)) | |
1212 | fn(sdev, data); | |
1213 | } | |
1214 | } | |
1215 | EXPORT_SYMBOL(starget_for_each_device); | |
1216 | ||
522939d4 | 1217 | /** |
14f501a4 | 1218 | * __starget_for_each_device - helper to walk all devices of a target (UNLOCKED) |
522939d4 | 1219 | * @starget: target whose devices we want to iterate over. |
14f501a4 RD |
1220 | * @data: parameter for callback @fn() |
1221 | * @fn: callback function that is invoked for each device | |
522939d4 MR |
1222 | * |
1223 | * This traverses over each device of @starget. It does _not_ | |
1224 | * take a reference on the scsi_device, so the whole loop must be | |
1225 | * protected by shost->host_lock. | |
1226 | * | |
1227 | * Note: The only reason why drivers would want to use this is because | |
1228 | * they need to access the device list in irq context. Otherwise you | |
1229 | * really want to use starget_for_each_device instead. | |
1230 | **/ | |
1231 | void __starget_for_each_device(struct scsi_target *starget, void *data, | |
1232 | void (*fn)(struct scsi_device *, void *)) | |
1233 | { | |
1234 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
1235 | struct scsi_device *sdev; | |
1236 | ||
1237 | __shost_for_each_device(sdev, shost) { | |
1238 | if ((sdev->channel == starget->channel) && | |
1239 | (sdev->id == starget->id)) | |
1240 | fn(sdev, data); | |
1241 | } | |
1242 | } | |
1243 | EXPORT_SYMBOL(__starget_for_each_device); | |
1244 | ||
1da177e4 LT |
1245 | /** |
1246 | * __scsi_device_lookup_by_target - find a device given the target (UNLOCKED) | |
1247 | * @starget: SCSI target pointer | |
1248 | * @lun: SCSI Logical Unit Number | |
1249 | * | |
eb44820c RL |
1250 | * Description: Looks up the scsi_device with the specified @lun for a given |
1251 | * @starget. The returned scsi_device does not have an additional | |
1da177e4 | 1252 | * reference. You must hold the host's host_lock over this call and |
32aeef60 HR |
1253 | * any access to the returned scsi_device. A scsi_device in state |
1254 | * SDEV_DEL is skipped. | |
1da177e4 | 1255 | * |
dc8875e1 | 1256 | * Note: The only reason why drivers should use this is because |
eb44820c | 1257 | * they need to access the device list in irq context. Otherwise you |
1da177e4 LT |
1258 | * really want to use scsi_device_lookup_by_target instead. |
1259 | **/ | |
1260 | struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget, | |
9cb78c16 | 1261 | u64 lun) |
1da177e4 LT |
1262 | { |
1263 | struct scsi_device *sdev; | |
1264 | ||
1265 | list_for_each_entry(sdev, &starget->devices, same_target_siblings) { | |
32aeef60 HR |
1266 | if (sdev->sdev_state == SDEV_DEL) |
1267 | continue; | |
1da177e4 LT |
1268 | if (sdev->lun ==lun) |
1269 | return sdev; | |
1270 | } | |
1271 | ||
1272 | return NULL; | |
1273 | } | |
1274 | EXPORT_SYMBOL(__scsi_device_lookup_by_target); | |
1275 | ||
1276 | /** | |
1277 | * scsi_device_lookup_by_target - find a device given the target | |
1278 | * @starget: SCSI target pointer | |
1279 | * @lun: SCSI Logical Unit Number | |
1280 | * | |
477e608c BZ |
1281 | * Description: Looks up the scsi_device with the specified @lun for a given |
1282 | * @starget. The returned scsi_device has an additional reference that | |
eb44820c | 1283 | * needs to be released with scsi_device_put once you're done with it. |
1da177e4 LT |
1284 | **/ |
1285 | struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget, | |
9cb78c16 | 1286 | u64 lun) |
1da177e4 LT |
1287 | { |
1288 | struct scsi_device *sdev; | |
1289 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
1290 | unsigned long flags; | |
1291 | ||
1292 | spin_lock_irqsave(shost->host_lock, flags); | |
1293 | sdev = __scsi_device_lookup_by_target(starget, lun); | |
1294 | if (sdev && scsi_device_get(sdev)) | |
1295 | sdev = NULL; | |
1296 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1297 | ||
1298 | return sdev; | |
1299 | } | |
1300 | EXPORT_SYMBOL(scsi_device_lookup_by_target); | |
1301 | ||
1302 | /** | |
eb44820c | 1303 | * __scsi_device_lookup - find a device given the host (UNLOCKED) |
1da177e4 LT |
1304 | * @shost: SCSI host pointer |
1305 | * @channel: SCSI channel (zero if only one channel) | |
eb44820c | 1306 | * @id: SCSI target number (physical unit number) |
1da177e4 LT |
1307 | * @lun: SCSI Logical Unit Number |
1308 | * | |
eb44820c RL |
1309 | * Description: Looks up the scsi_device with the specified @channel, @id, @lun |
1310 | * for a given host. The returned scsi_device does not have an additional | |
1311 | * reference. You must hold the host's host_lock over this call and any access | |
1312 | * to the returned scsi_device. | |
1da177e4 LT |
1313 | * |
1314 | * Note: The only reason why drivers would want to use this is because | |
eb44820c | 1315 | * they need to access the device list in irq context. Otherwise you |
1da177e4 LT |
1316 | * really want to use scsi_device_lookup instead. |
1317 | **/ | |
1318 | struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost, | |
9cb78c16 | 1319 | uint channel, uint id, u64 lun) |
1da177e4 LT |
1320 | { |
1321 | struct scsi_device *sdev; | |
1322 | ||
1323 | list_for_each_entry(sdev, &shost->__devices, siblings) { | |
1324 | if (sdev->channel == channel && sdev->id == id && | |
1325 | sdev->lun ==lun) | |
1326 | return sdev; | |
1327 | } | |
1328 | ||
1329 | return NULL; | |
1330 | } | |
1331 | EXPORT_SYMBOL(__scsi_device_lookup); | |
1332 | ||
1333 | /** | |
1334 | * scsi_device_lookup - find a device given the host | |
1335 | * @shost: SCSI host pointer | |
1336 | * @channel: SCSI channel (zero if only one channel) | |
1337 | * @id: SCSI target number (physical unit number) | |
1338 | * @lun: SCSI Logical Unit Number | |
1339 | * | |
eb44820c RL |
1340 | * Description: Looks up the scsi_device with the specified @channel, @id, @lun |
1341 | * for a given host. The returned scsi_device has an additional reference that | |
1342 | * needs to be released with scsi_device_put once you're done with it. | |
1da177e4 LT |
1343 | **/ |
1344 | struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost, | |
9cb78c16 | 1345 | uint channel, uint id, u64 lun) |
1da177e4 LT |
1346 | { |
1347 | struct scsi_device *sdev; | |
1348 | unsigned long flags; | |
1349 | ||
1350 | spin_lock_irqsave(shost->host_lock, flags); | |
1351 | sdev = __scsi_device_lookup(shost, channel, id, lun); | |
1352 | if (sdev && scsi_device_get(sdev)) | |
1353 | sdev = NULL; | |
1354 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1355 | ||
1356 | return sdev; | |
1357 | } | |
1358 | EXPORT_SYMBOL(scsi_device_lookup); | |
1359 | ||
1da177e4 LT |
1360 | MODULE_DESCRIPTION("SCSI core"); |
1361 | MODULE_LICENSE("GPL"); | |
1362 | ||
1363 | module_param(scsi_logging_level, int, S_IRUGO|S_IWUSR); | |
1364 | MODULE_PARM_DESC(scsi_logging_level, "a bit mask of logging levels"); | |
1365 | ||
d285203c CH |
1366 | bool scsi_use_blk_mq = false; |
1367 | module_param_named(use_blk_mq, scsi_use_blk_mq, bool, S_IWUSR | S_IRUGO); | |
1368 | ||
1da177e4 LT |
1369 | static int __init init_scsi(void) |
1370 | { | |
9bf09c23 | 1371 | int error; |
1da177e4 LT |
1372 | |
1373 | error = scsi_init_queue(); | |
1374 | if (error) | |
1375 | return error; | |
1376 | error = scsi_init_procfs(); | |
1377 | if (error) | |
1378 | goto cleanup_queue; | |
1379 | error = scsi_init_devinfo(); | |
1380 | if (error) | |
1381 | goto cleanup_procfs; | |
1382 | error = scsi_init_hosts(); | |
1383 | if (error) | |
1384 | goto cleanup_devlist; | |
1385 | error = scsi_init_sysctl(); | |
1386 | if (error) | |
1387 | goto cleanup_hosts; | |
1388 | error = scsi_sysfs_register(); | |
1389 | if (error) | |
1390 | goto cleanup_sysctl; | |
1391 | ||
84314fd4 JS |
1392 | scsi_netlink_init(); |
1393 | ||
1da177e4 LT |
1394 | printk(KERN_NOTICE "SCSI subsystem initialized\n"); |
1395 | return 0; | |
1396 | ||
1397 | cleanup_sysctl: | |
1398 | scsi_exit_sysctl(); | |
1399 | cleanup_hosts: | |
1400 | scsi_exit_hosts(); | |
1401 | cleanup_devlist: | |
1402 | scsi_exit_devinfo(); | |
1403 | cleanup_procfs: | |
1404 | scsi_exit_procfs(); | |
1405 | cleanup_queue: | |
1406 | scsi_exit_queue(); | |
1407 | printk(KERN_ERR "SCSI subsystem failed to initialize, error = %d\n", | |
1408 | -error); | |
1409 | return error; | |
1410 | } | |
1411 | ||
1412 | static void __exit exit_scsi(void) | |
1413 | { | |
84314fd4 | 1414 | scsi_netlink_exit(); |
1da177e4 LT |
1415 | scsi_sysfs_unregister(); |
1416 | scsi_exit_sysctl(); | |
1417 | scsi_exit_hosts(); | |
1418 | scsi_exit_devinfo(); | |
1da177e4 LT |
1419 | scsi_exit_procfs(); |
1420 | scsi_exit_queue(); | |
a4683487 | 1421 | async_unregister_domain(&scsi_sd_probe_domain); |
1da177e4 LT |
1422 | } |
1423 | ||
1424 | subsys_initcall(init_scsi); | |
1425 | module_exit(exit_scsi); |