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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> | |
43 | #include <linux/sched.h> | |
44 | #include <linux/timer.h> | |
45 | #include <linux/string.h> | |
46 | #include <linux/slab.h> | |
47 | #include <linux/blkdev.h> | |
48 | #include <linux/delay.h> | |
49 | #include <linux/init.h> | |
50 | #include <linux/completion.h> | |
1da177e4 LT |
51 | #include <linux/unistd.h> |
52 | #include <linux/spinlock.h> | |
53 | #include <linux/kmod.h> | |
54 | #include <linux/interrupt.h> | |
55 | #include <linux/notifier.h> | |
56 | #include <linux/cpu.h> | |
0b950672 | 57 | #include <linux/mutex.h> |
1da177e4 LT |
58 | |
59 | #include <scsi/scsi.h> | |
60 | #include <scsi/scsi_cmnd.h> | |
61 | #include <scsi/scsi_dbg.h> | |
62 | #include <scsi/scsi_device.h> | |
63 | #include <scsi/scsi_eh.h> | |
64 | #include <scsi/scsi_host.h> | |
65 | #include <scsi/scsi_tcq.h> | |
1da177e4 LT |
66 | |
67 | #include "scsi_priv.h" | |
68 | #include "scsi_logging.h" | |
69 | ||
52c1da39 | 70 | static void scsi_done(struct scsi_cmnd *cmd); |
1da177e4 LT |
71 | |
72 | /* | |
73 | * Definitions and constants. | |
74 | */ | |
75 | ||
76 | #define MIN_RESET_DELAY (2*HZ) | |
77 | ||
78 | /* Do not call reset on error if we just did a reset within 15 sec. */ | |
79 | #define MIN_RESET_PERIOD (15*HZ) | |
80 | ||
81 | /* | |
82 | * Macro to determine the size of SCSI command. This macro takes vendor | |
83 | * unique commands into account. SCSI commands in groups 6 and 7 are | |
84 | * vendor unique and we will depend upon the command length being | |
85 | * supplied correctly in cmd_len. | |
86 | */ | |
87 | #define CDB_SIZE(cmd) (((((cmd)->cmnd[0] >> 5) & 7) < 6) ? \ | |
88 | COMMAND_SIZE((cmd)->cmnd[0]) : (cmd)->cmd_len) | |
89 | ||
90 | /* | |
91 | * Note - the initial logging level can be set here to log events at boot time. | |
92 | * After the system is up, you may enable logging via the /proc interface. | |
93 | */ | |
94 | unsigned int scsi_logging_level; | |
95 | #if defined(CONFIG_SCSI_LOGGING) | |
96 | EXPORT_SYMBOL(scsi_logging_level); | |
97 | #endif | |
98 | ||
4ff36718 MW |
99 | static const char *const scsi_device_types[] = { |
100 | "Direct access ", | |
101 | "Sequential access", | |
1da177e4 LT |
102 | "Printer ", |
103 | "Processor ", | |
104 | "WORM ", | |
4ff36718 | 105 | "CD/DVD ", |
1da177e4 | 106 | "Scanner ", |
4ff36718 MW |
107 | "Optical memory ", |
108 | "Media changer ", | |
1da177e4 | 109 | "Communications ", |
4ff36718 MW |
110 | "ASC IT8 ", |
111 | "ASC IT8 ", | |
1da177e4 LT |
112 | "RAID ", |
113 | "Enclosure ", | |
4ff36718 MW |
114 | "Direct access RBC", |
115 | "Optical card ", | |
116 | "Bridge controller", | |
117 | "Object storage ", | |
118 | "Automation/Drive ", | |
1da177e4 | 119 | }; |
4ff36718 MW |
120 | |
121 | const char * scsi_device_type(unsigned type) | |
122 | { | |
123 | if (type == 0x1e) | |
124 | return "Well-known LUN "; | |
125 | if (type == 0x1f) | |
126 | return "No Device "; | |
127 | if (type > ARRAY_SIZE(scsi_device_types)) | |
128 | return "Unknown "; | |
129 | return scsi_device_types[type]; | |
130 | } | |
131 | ||
132 | EXPORT_SYMBOL(scsi_device_type); | |
1da177e4 | 133 | |
1da177e4 LT |
134 | struct scsi_host_cmd_pool { |
135 | kmem_cache_t *slab; | |
136 | unsigned int users; | |
137 | char *name; | |
138 | unsigned int slab_flags; | |
c53033f6 | 139 | gfp_t gfp_mask; |
1da177e4 LT |
140 | }; |
141 | ||
142 | static struct scsi_host_cmd_pool scsi_cmd_pool = { | |
143 | .name = "scsi_cmd_cache", | |
144 | .slab_flags = SLAB_HWCACHE_ALIGN, | |
145 | }; | |
146 | ||
147 | static struct scsi_host_cmd_pool scsi_cmd_dma_pool = { | |
148 | .name = "scsi_cmd_cache(DMA)", | |
149 | .slab_flags = SLAB_HWCACHE_ALIGN|SLAB_CACHE_DMA, | |
150 | .gfp_mask = __GFP_DMA, | |
151 | }; | |
152 | ||
0b950672 | 153 | static DEFINE_MUTEX(host_cmd_pool_mutex); |
1da177e4 LT |
154 | |
155 | static struct scsi_cmnd *__scsi_get_command(struct Scsi_Host *shost, | |
c53033f6 | 156 | gfp_t gfp_mask) |
1da177e4 LT |
157 | { |
158 | struct scsi_cmnd *cmd; | |
159 | ||
160 | cmd = kmem_cache_alloc(shost->cmd_pool->slab, | |
161 | gfp_mask | shost->cmd_pool->gfp_mask); | |
162 | ||
163 | if (unlikely(!cmd)) { | |
164 | unsigned long flags; | |
165 | ||
166 | spin_lock_irqsave(&shost->free_list_lock, flags); | |
167 | if (likely(!list_empty(&shost->free_list))) { | |
168 | cmd = list_entry(shost->free_list.next, | |
169 | struct scsi_cmnd, list); | |
170 | list_del_init(&cmd->list); | |
171 | } | |
172 | spin_unlock_irqrestore(&shost->free_list_lock, flags); | |
173 | } | |
174 | ||
175 | return cmd; | |
176 | } | |
177 | ||
178 | /* | |
179 | * Function: scsi_get_command() | |
180 | * | |
181 | * Purpose: Allocate and setup a scsi command block | |
182 | * | |
183 | * Arguments: dev - parent scsi device | |
184 | * gfp_mask- allocator flags | |
185 | * | |
186 | * Returns: The allocated scsi command structure. | |
187 | */ | |
c53033f6 | 188 | struct scsi_cmnd *scsi_get_command(struct scsi_device *dev, gfp_t gfp_mask) |
1da177e4 LT |
189 | { |
190 | struct scsi_cmnd *cmd; | |
191 | ||
192 | /* Bail if we can't get a reference to the device */ | |
193 | if (!get_device(&dev->sdev_gendev)) | |
194 | return NULL; | |
195 | ||
196 | cmd = __scsi_get_command(dev->host, gfp_mask); | |
197 | ||
198 | if (likely(cmd != NULL)) { | |
199 | unsigned long flags; | |
200 | ||
201 | memset(cmd, 0, sizeof(*cmd)); | |
202 | cmd->device = dev; | |
1da177e4 LT |
203 | init_timer(&cmd->eh_timeout); |
204 | INIT_LIST_HEAD(&cmd->list); | |
205 | spin_lock_irqsave(&dev->list_lock, flags); | |
206 | list_add_tail(&cmd->list, &dev->cmd_list); | |
207 | spin_unlock_irqrestore(&dev->list_lock, flags); | |
79e448bf | 208 | cmd->jiffies_at_alloc = jiffies; |
1da177e4 LT |
209 | } else |
210 | put_device(&dev->sdev_gendev); | |
211 | ||
212 | return cmd; | |
213 | } | |
214 | EXPORT_SYMBOL(scsi_get_command); | |
215 | ||
216 | /* | |
217 | * Function: scsi_put_command() | |
218 | * | |
219 | * Purpose: Free a scsi command block | |
220 | * | |
221 | * Arguments: cmd - command block to free | |
222 | * | |
223 | * Returns: Nothing. | |
224 | * | |
225 | * Notes: The command must not belong to any lists. | |
226 | */ | |
227 | void scsi_put_command(struct scsi_cmnd *cmd) | |
228 | { | |
229 | struct scsi_device *sdev = cmd->device; | |
230 | struct Scsi_Host *shost = sdev->host; | |
231 | unsigned long flags; | |
232 | ||
233 | /* serious error if the command hasn't come from a device list */ | |
234 | spin_lock_irqsave(&cmd->device->list_lock, flags); | |
235 | BUG_ON(list_empty(&cmd->list)); | |
236 | list_del_init(&cmd->list); | |
237 | spin_unlock(&cmd->device->list_lock); | |
238 | /* changing locks here, don't need to restore the irq state */ | |
239 | spin_lock(&shost->free_list_lock); | |
240 | if (unlikely(list_empty(&shost->free_list))) { | |
241 | list_add(&cmd->list, &shost->free_list); | |
242 | cmd = NULL; | |
243 | } | |
244 | spin_unlock_irqrestore(&shost->free_list_lock, flags); | |
245 | ||
246 | if (likely(cmd != NULL)) | |
247 | kmem_cache_free(shost->cmd_pool->slab, cmd); | |
248 | ||
249 | put_device(&sdev->sdev_gendev); | |
250 | } | |
251 | EXPORT_SYMBOL(scsi_put_command); | |
252 | ||
253 | /* | |
254 | * Function: scsi_setup_command_freelist() | |
255 | * | |
256 | * Purpose: Setup the command freelist for a scsi host. | |
257 | * | |
258 | * Arguments: shost - host to allocate the freelist for. | |
259 | * | |
260 | * Returns: Nothing. | |
261 | */ | |
262 | int scsi_setup_command_freelist(struct Scsi_Host *shost) | |
263 | { | |
264 | struct scsi_host_cmd_pool *pool; | |
265 | struct scsi_cmnd *cmd; | |
266 | ||
267 | spin_lock_init(&shost->free_list_lock); | |
268 | INIT_LIST_HEAD(&shost->free_list); | |
269 | ||
270 | /* | |
271 | * Select a command slab for this host and create it if not | |
272 | * yet existant. | |
273 | */ | |
0b950672 | 274 | mutex_lock(&host_cmd_pool_mutex); |
1da177e4 LT |
275 | pool = (shost->unchecked_isa_dma ? &scsi_cmd_dma_pool : &scsi_cmd_pool); |
276 | if (!pool->users) { | |
277 | pool->slab = kmem_cache_create(pool->name, | |
278 | sizeof(struct scsi_cmnd), 0, | |
279 | pool->slab_flags, NULL, NULL); | |
280 | if (!pool->slab) | |
281 | goto fail; | |
282 | } | |
283 | ||
284 | pool->users++; | |
285 | shost->cmd_pool = pool; | |
0b950672 | 286 | mutex_unlock(&host_cmd_pool_mutex); |
1da177e4 LT |
287 | |
288 | /* | |
289 | * Get one backup command for this host. | |
290 | */ | |
291 | cmd = kmem_cache_alloc(shost->cmd_pool->slab, | |
292 | GFP_KERNEL | shost->cmd_pool->gfp_mask); | |
293 | if (!cmd) | |
294 | goto fail2; | |
295 | list_add(&cmd->list, &shost->free_list); | |
296 | return 0; | |
297 | ||
298 | fail2: | |
299 | if (!--pool->users) | |
300 | kmem_cache_destroy(pool->slab); | |
301 | return -ENOMEM; | |
302 | fail: | |
0b950672 | 303 | mutex_unlock(&host_cmd_pool_mutex); |
1da177e4 LT |
304 | return -ENOMEM; |
305 | ||
306 | } | |
307 | ||
308 | /* | |
309 | * Function: scsi_destroy_command_freelist() | |
310 | * | |
311 | * Purpose: Release the command freelist for a scsi host. | |
312 | * | |
313 | * Arguments: shost - host that's freelist is going to be destroyed | |
314 | */ | |
315 | void scsi_destroy_command_freelist(struct Scsi_Host *shost) | |
316 | { | |
317 | while (!list_empty(&shost->free_list)) { | |
318 | struct scsi_cmnd *cmd; | |
319 | ||
320 | cmd = list_entry(shost->free_list.next, struct scsi_cmnd, list); | |
321 | list_del_init(&cmd->list); | |
322 | kmem_cache_free(shost->cmd_pool->slab, cmd); | |
323 | } | |
324 | ||
0b950672 | 325 | mutex_lock(&host_cmd_pool_mutex); |
1da177e4 LT |
326 | if (!--shost->cmd_pool->users) |
327 | kmem_cache_destroy(shost->cmd_pool->slab); | |
0b950672 | 328 | mutex_unlock(&host_cmd_pool_mutex); |
1da177e4 LT |
329 | } |
330 | ||
331 | #ifdef CONFIG_SCSI_LOGGING | |
332 | void scsi_log_send(struct scsi_cmnd *cmd) | |
333 | { | |
334 | unsigned int level; | |
335 | struct scsi_device *sdev; | |
336 | ||
337 | /* | |
338 | * If ML QUEUE log level is greater than or equal to: | |
339 | * | |
340 | * 1: nothing (match completion) | |
341 | * | |
342 | * 2: log opcode + command of all commands | |
343 | * | |
344 | * 3: same as 2 plus dump cmd address | |
345 | * | |
346 | * 4: same as 3 plus dump extra junk | |
347 | */ | |
348 | if (unlikely(scsi_logging_level)) { | |
349 | level = SCSI_LOG_LEVEL(SCSI_LOG_MLQUEUE_SHIFT, | |
350 | SCSI_LOG_MLQUEUE_BITS); | |
351 | if (level > 1) { | |
352 | sdev = cmd->device; | |
9ccfc756 | 353 | sdev_printk(KERN_INFO, sdev, "send "); |
1da177e4 LT |
354 | if (level > 2) |
355 | printk("0x%p ", cmd); | |
356 | /* | |
357 | * spaces to match disposition and cmd->result | |
358 | * output in scsi_log_completion. | |
359 | */ | |
360 | printk(" "); | |
361 | scsi_print_command(cmd); | |
362 | if (level > 3) { | |
363 | printk(KERN_INFO "buffer = 0x%p, bufflen = %d," | |
364 | " done = 0x%p, queuecommand 0x%p\n", | |
631c228c | 365 | cmd->request_buffer, cmd->request_bufflen, |
1da177e4 LT |
366 | cmd->done, |
367 | sdev->host->hostt->queuecommand); | |
368 | ||
369 | } | |
370 | } | |
371 | } | |
372 | } | |
373 | ||
374 | void scsi_log_completion(struct scsi_cmnd *cmd, int disposition) | |
375 | { | |
376 | unsigned int level; | |
377 | struct scsi_device *sdev; | |
378 | ||
379 | /* | |
380 | * If ML COMPLETE log level is greater than or equal to: | |
381 | * | |
382 | * 1: log disposition, result, opcode + command, and conditionally | |
383 | * sense data for failures or non SUCCESS dispositions. | |
384 | * | |
385 | * 2: same as 1 but for all command completions. | |
386 | * | |
387 | * 3: same as 2 plus dump cmd address | |
388 | * | |
389 | * 4: same as 3 plus dump extra junk | |
390 | */ | |
391 | if (unlikely(scsi_logging_level)) { | |
392 | level = SCSI_LOG_LEVEL(SCSI_LOG_MLCOMPLETE_SHIFT, | |
393 | SCSI_LOG_MLCOMPLETE_BITS); | |
394 | if (((level > 0) && (cmd->result || disposition != SUCCESS)) || | |
395 | (level > 1)) { | |
396 | sdev = cmd->device; | |
9ccfc756 | 397 | sdev_printk(KERN_INFO, sdev, "done "); |
1da177e4 LT |
398 | if (level > 2) |
399 | printk("0x%p ", cmd); | |
400 | /* | |
401 | * Dump truncated values, so we usually fit within | |
402 | * 80 chars. | |
403 | */ | |
404 | switch (disposition) { | |
405 | case SUCCESS: | |
406 | printk("SUCCESS"); | |
407 | break; | |
408 | case NEEDS_RETRY: | |
409 | printk("RETRY "); | |
410 | break; | |
411 | case ADD_TO_MLQUEUE: | |
412 | printk("MLQUEUE"); | |
413 | break; | |
414 | case FAILED: | |
415 | printk("FAILED "); | |
416 | break; | |
417 | case TIMEOUT_ERROR: | |
418 | /* | |
419 | * If called via scsi_times_out. | |
420 | */ | |
421 | printk("TIMEOUT"); | |
422 | break; | |
423 | default: | |
424 | printk("UNKNOWN"); | |
425 | } | |
426 | printk(" %8x ", cmd->result); | |
427 | scsi_print_command(cmd); | |
428 | if (status_byte(cmd->result) & CHECK_CONDITION) { | |
429 | /* | |
db9dff36 | 430 | * XXX The scsi_print_sense formatting/prefix |
1da177e4 LT |
431 | * doesn't match this function. |
432 | */ | |
433 | scsi_print_sense("", cmd); | |
434 | } | |
435 | if (level > 3) { | |
436 | printk(KERN_INFO "scsi host busy %d failed %d\n", | |
437 | sdev->host->host_busy, | |
438 | sdev->host->host_failed); | |
439 | } | |
440 | } | |
441 | } | |
442 | } | |
443 | #endif | |
444 | ||
445 | /* | |
446 | * Assign a serial number and pid to the request for error recovery | |
447 | * and debugging purposes. Protected by the Host_Lock of host. | |
448 | */ | |
449 | static inline void scsi_cmd_get_serial(struct Scsi_Host *host, struct scsi_cmnd *cmd) | |
450 | { | |
451 | cmd->serial_number = host->cmd_serial_number++; | |
452 | if (cmd->serial_number == 0) | |
453 | cmd->serial_number = host->cmd_serial_number++; | |
454 | ||
455 | cmd->pid = host->cmd_pid++; | |
456 | if (cmd->pid == 0) | |
457 | cmd->pid = host->cmd_pid++; | |
458 | } | |
459 | ||
460 | /* | |
461 | * Function: scsi_dispatch_command | |
462 | * | |
463 | * Purpose: Dispatch a command to the low-level driver. | |
464 | * | |
465 | * Arguments: cmd - command block we are dispatching. | |
466 | * | |
467 | * Notes: | |
468 | */ | |
469 | int scsi_dispatch_cmd(struct scsi_cmnd *cmd) | |
470 | { | |
471 | struct Scsi_Host *host = cmd->device->host; | |
472 | unsigned long flags = 0; | |
473 | unsigned long timeout; | |
474 | int rtn = 0; | |
475 | ||
476 | /* check if the device is still usable */ | |
477 | if (unlikely(cmd->device->sdev_state == SDEV_DEL)) { | |
478 | /* in SDEV_DEL we error all commands. DID_NO_CONNECT | |
479 | * returns an immediate error upwards, and signals | |
480 | * that the device is no longer present */ | |
481 | cmd->result = DID_NO_CONNECT << 16; | |
482 | atomic_inc(&cmd->device->iorequest_cnt); | |
69b52893 | 483 | __scsi_done(cmd); |
1da177e4 LT |
484 | /* return 0 (because the command has been processed) */ |
485 | goto out; | |
486 | } | |
487 | ||
488 | /* Check to see if the scsi lld put this device into state SDEV_BLOCK. */ | |
489 | if (unlikely(cmd->device->sdev_state == SDEV_BLOCK)) { | |
490 | /* | |
491 | * in SDEV_BLOCK, the command is just put back on the device | |
492 | * queue. The suspend state has already blocked the queue so | |
493 | * future requests should not occur until the device | |
494 | * transitions out of the suspend state. | |
495 | */ | |
496 | scsi_queue_insert(cmd, SCSI_MLQUEUE_DEVICE_BUSY); | |
497 | ||
498 | SCSI_LOG_MLQUEUE(3, printk("queuecommand : device blocked \n")); | |
499 | ||
500 | /* | |
501 | * NOTE: rtn is still zero here because we don't need the | |
502 | * queue to be plugged on return (it's already stopped) | |
503 | */ | |
504 | goto out; | |
505 | } | |
506 | ||
507 | /* | |
508 | * If SCSI-2 or lower, store the LUN value in cmnd. | |
509 | */ | |
4d7db04a JB |
510 | if (cmd->device->scsi_level <= SCSI_2 && |
511 | cmd->device->scsi_level != SCSI_UNKNOWN) { | |
1da177e4 LT |
512 | cmd->cmnd[1] = (cmd->cmnd[1] & 0x1f) | |
513 | (cmd->device->lun << 5 & 0xe0); | |
514 | } | |
515 | ||
516 | /* | |
517 | * We will wait MIN_RESET_DELAY clock ticks after the last reset so | |
518 | * we can avoid the drive not being ready. | |
519 | */ | |
520 | timeout = host->last_reset + MIN_RESET_DELAY; | |
521 | ||
522 | if (host->resetting && time_before(jiffies, timeout)) { | |
523 | int ticks_remaining = timeout - jiffies; | |
524 | /* | |
525 | * NOTE: This may be executed from within an interrupt | |
526 | * handler! This is bad, but for now, it'll do. The irq | |
527 | * level of the interrupt handler has been masked out by the | |
528 | * platform dependent interrupt handling code already, so the | |
529 | * sti() here will not cause another call to the SCSI host's | |
530 | * interrupt handler (assuming there is one irq-level per | |
531 | * host). | |
532 | */ | |
533 | while (--ticks_remaining >= 0) | |
534 | mdelay(1 + 999 / HZ); | |
535 | host->resetting = 0; | |
536 | } | |
537 | ||
538 | /* | |
539 | * AK: unlikely race here: for some reason the timer could | |
540 | * expire before the serial number is set up below. | |
541 | */ | |
542 | scsi_add_timer(cmd, cmd->timeout_per_command, scsi_times_out); | |
543 | ||
544 | scsi_log_send(cmd); | |
545 | ||
546 | /* | |
547 | * We will use a queued command if possible, otherwise we will | |
548 | * emulate the queuing and calling of completion function ourselves. | |
549 | */ | |
1da177e4 LT |
550 | atomic_inc(&cmd->device->iorequest_cnt); |
551 | ||
552 | /* | |
553 | * Before we queue this command, check if the command | |
554 | * length exceeds what the host adapter can handle. | |
555 | */ | |
556 | if (CDB_SIZE(cmd) > cmd->device->host->max_cmd_len) { | |
557 | SCSI_LOG_MLQUEUE(3, | |
558 | printk("queuecommand : command too long.\n")); | |
559 | cmd->result = (DID_ABORT << 16); | |
560 | ||
561 | scsi_done(cmd); | |
562 | goto out; | |
563 | } | |
564 | ||
565 | spin_lock_irqsave(host->host_lock, flags); | |
566 | scsi_cmd_get_serial(host, cmd); | |
567 | ||
d2c9d9ea | 568 | if (unlikely(host->shost_state == SHOST_DEL)) { |
1da177e4 LT |
569 | cmd->result = (DID_NO_CONNECT << 16); |
570 | scsi_done(cmd); | |
571 | } else { | |
572 | rtn = host->hostt->queuecommand(cmd, scsi_done); | |
573 | } | |
574 | spin_unlock_irqrestore(host->host_lock, flags); | |
575 | if (rtn) { | |
d8c37e7b TH |
576 | if (scsi_delete_timer(cmd)) { |
577 | atomic_inc(&cmd->device->iodone_cnt); | |
578 | scsi_queue_insert(cmd, | |
579 | (rtn == SCSI_MLQUEUE_DEVICE_BUSY) ? | |
580 | rtn : SCSI_MLQUEUE_HOST_BUSY); | |
581 | } | |
1da177e4 LT |
582 | SCSI_LOG_MLQUEUE(3, |
583 | printk("queuecommand : request rejected\n")); | |
584 | } | |
585 | ||
586 | out: | |
587 | SCSI_LOG_MLQUEUE(3, printk("leaving scsi_dispatch_cmnd()\n")); | |
588 | return rtn; | |
589 | } | |
590 | ||
1da177e4 LT |
591 | |
592 | /* | |
593 | * Per-CPU I/O completion queue. | |
594 | */ | |
595 | static DEFINE_PER_CPU(struct list_head, scsi_done_q); | |
596 | ||
89f48c4d LT |
597 | /** |
598 | * scsi_req_abort_cmd -- Request command recovery for the specified command | |
599 | * cmd: pointer to the SCSI command of interest | |
600 | * | |
601 | * This function requests that SCSI Core start recovery for the | |
602 | * command by deleting the timer and adding the command to the eh | |
603 | * queue. It can be called by either LLDDs or SCSI Core. LLDDs who | |
604 | * implement their own error recovery MAY ignore the timeout event if | |
605 | * they generated scsi_req_abort_cmd. | |
606 | */ | |
607 | void scsi_req_abort_cmd(struct scsi_cmnd *cmd) | |
608 | { | |
609 | if (!scsi_delete_timer(cmd)) | |
610 | return; | |
611 | scsi_times_out(cmd); | |
612 | } | |
613 | EXPORT_SYMBOL(scsi_req_abort_cmd); | |
614 | ||
1da177e4 LT |
615 | /** |
616 | * scsi_done - Enqueue the finished SCSI command into the done queue. | |
617 | * @cmd: The SCSI Command for which a low-level device driver (LLDD) gives | |
618 | * ownership back to SCSI Core -- i.e. the LLDD has finished with it. | |
619 | * | |
620 | * This function is the mid-level's (SCSI Core) interrupt routine, which | |
621 | * regains ownership of the SCSI command (de facto) from a LLDD, and enqueues | |
622 | * the command to the done queue for further processing. | |
623 | * | |
624 | * This is the producer of the done queue who enqueues at the tail. | |
625 | * | |
626 | * This function is interrupt context safe. | |
627 | */ | |
52c1da39 | 628 | static void scsi_done(struct scsi_cmnd *cmd) |
1da177e4 LT |
629 | { |
630 | /* | |
631 | * We don't have to worry about this one timing out any more. | |
632 | * If we are unable to remove the timer, then the command | |
633 | * has already timed out. In which case, we have no choice but to | |
634 | * let the timeout function run, as we have no idea where in fact | |
635 | * that function could really be. It might be on another processor, | |
636 | * etc, etc. | |
637 | */ | |
638 | if (!scsi_delete_timer(cmd)) | |
639 | return; | |
640 | __scsi_done(cmd); | |
641 | } | |
642 | ||
643 | /* Private entry to scsi_done() to complete a command when the timer | |
644 | * isn't running --- used by scsi_times_out */ | |
645 | void __scsi_done(struct scsi_cmnd *cmd) | |
646 | { | |
1aea6434 | 647 | struct request *rq = cmd->request; |
1da177e4 LT |
648 | |
649 | /* | |
650 | * Set the serial numbers back to zero | |
651 | */ | |
652 | cmd->serial_number = 0; | |
1da177e4 LT |
653 | |
654 | atomic_inc(&cmd->device->iodone_cnt); | |
655 | if (cmd->result) | |
656 | atomic_inc(&cmd->device->ioerr_cnt); | |
657 | ||
1aea6434 JA |
658 | BUG_ON(!rq); |
659 | ||
1da177e4 | 660 | /* |
1aea6434 JA |
661 | * The uptodate/nbytes values don't matter, as we allow partial |
662 | * completes and thus will check this in the softirq callback | |
1da177e4 | 663 | */ |
1aea6434 JA |
664 | rq->completion_data = cmd; |
665 | blk_complete_request(rq); | |
1da177e4 LT |
666 | } |
667 | ||
668 | /* | |
669 | * Function: scsi_retry_command | |
670 | * | |
671 | * Purpose: Send a command back to the low level to be retried. | |
672 | * | |
673 | * Notes: This command is always executed in the context of the | |
674 | * bottom half handler, or the error handler thread. Low | |
675 | * level drivers should not become re-entrant as a result of | |
676 | * this. | |
677 | */ | |
1aea6434 | 678 | int scsi_retry_command(struct scsi_cmnd *cmd) |
1da177e4 | 679 | { |
1da177e4 LT |
680 | /* |
681 | * Zero the sense information from the last time we tried | |
682 | * this command. | |
683 | */ | |
684 | memset(cmd->sense_buffer, 0, sizeof(cmd->sense_buffer)); | |
685 | ||
686 | return scsi_queue_insert(cmd, SCSI_MLQUEUE_EH_RETRY); | |
687 | } | |
688 | ||
689 | /* | |
690 | * Function: scsi_finish_command | |
691 | * | |
692 | * Purpose: Pass command off to upper layer for finishing of I/O | |
693 | * request, waking processes that are waiting on results, | |
694 | * etc. | |
695 | */ | |
696 | void scsi_finish_command(struct scsi_cmnd *cmd) | |
697 | { | |
698 | struct scsi_device *sdev = cmd->device; | |
699 | struct Scsi_Host *shost = sdev->host; | |
1da177e4 LT |
700 | |
701 | scsi_device_unbusy(sdev); | |
702 | ||
703 | /* | |
704 | * Clear the flags which say that the device/host is no longer | |
705 | * capable of accepting new commands. These are set in scsi_queue.c | |
706 | * for both the queue full condition on a device, and for a | |
707 | * host full condition on the host. | |
708 | * | |
709 | * XXX(hch): What about locking? | |
710 | */ | |
711 | shost->host_blocked = 0; | |
712 | sdev->device_blocked = 0; | |
713 | ||
714 | /* | |
715 | * If we have valid sense information, then some kind of recovery | |
716 | * must have taken place. Make a note of this. | |
717 | */ | |
718 | if (SCSI_SENSE_VALID(cmd)) | |
719 | cmd->result |= (DRIVER_SENSE << 24); | |
720 | ||
3bf743e7 JG |
721 | SCSI_LOG_MLCOMPLETE(4, sdev_printk(KERN_INFO, sdev, |
722 | "Notifying upper driver of completion " | |
723 | "(result %x)\n", cmd->result)); | |
1da177e4 | 724 | |
1da177e4 LT |
725 | cmd->done(cmd); |
726 | } | |
727 | EXPORT_SYMBOL(scsi_finish_command); | |
728 | ||
729 | /* | |
730 | * Function: scsi_adjust_queue_depth() | |
731 | * | |
732 | * Purpose: Allow low level drivers to tell us to change the queue depth | |
733 | * on a specific SCSI device | |
734 | * | |
735 | * Arguments: sdev - SCSI Device in question | |
736 | * tagged - Do we use tagged queueing (non-0) or do we treat | |
737 | * this device as an untagged device (0) | |
738 | * tags - Number of tags allowed if tagged queueing enabled, | |
739 | * or number of commands the low level driver can | |
740 | * queue up in non-tagged mode (as per cmd_per_lun). | |
741 | * | |
742 | * Returns: Nothing | |
743 | * | |
744 | * Lock Status: None held on entry | |
745 | * | |
746 | * Notes: Low level drivers may call this at any time and we will do | |
747 | * the right thing depending on whether or not the device is | |
748 | * currently active and whether or not it even has the | |
749 | * command blocks built yet. | |
750 | */ | |
751 | void scsi_adjust_queue_depth(struct scsi_device *sdev, int tagged, int tags) | |
752 | { | |
753 | unsigned long flags; | |
754 | ||
755 | /* | |
756 | * refuse to set tagged depth to an unworkable size | |
757 | */ | |
758 | if (tags <= 0) | |
759 | return; | |
760 | ||
761 | spin_lock_irqsave(sdev->request_queue->queue_lock, flags); | |
762 | ||
763 | /* Check to see if the queue is managed by the block layer | |
764 | * if it is, and we fail to adjust the depth, exit */ | |
765 | if (blk_queue_tagged(sdev->request_queue) && | |
766 | blk_queue_resize_tags(sdev->request_queue, tags) != 0) | |
767 | goto out; | |
768 | ||
769 | sdev->queue_depth = tags; | |
770 | switch (tagged) { | |
771 | case MSG_ORDERED_TAG: | |
772 | sdev->ordered_tags = 1; | |
773 | sdev->simple_tags = 1; | |
774 | break; | |
775 | case MSG_SIMPLE_TAG: | |
776 | sdev->ordered_tags = 0; | |
777 | sdev->simple_tags = 1; | |
778 | break; | |
779 | default: | |
9ccfc756 JB |
780 | sdev_printk(KERN_WARNING, sdev, |
781 | "scsi_adjust_queue_depth, bad queue type, " | |
782 | "disabled\n"); | |
1da177e4 LT |
783 | case 0: |
784 | sdev->ordered_tags = sdev->simple_tags = 0; | |
785 | sdev->queue_depth = tags; | |
786 | break; | |
787 | } | |
788 | out: | |
789 | spin_unlock_irqrestore(sdev->request_queue->queue_lock, flags); | |
790 | } | |
791 | EXPORT_SYMBOL(scsi_adjust_queue_depth); | |
792 | ||
793 | /* | |
794 | * Function: scsi_track_queue_full() | |
795 | * | |
796 | * Purpose: This function will track successive QUEUE_FULL events on a | |
797 | * specific SCSI device to determine if and when there is a | |
798 | * need to adjust the queue depth on the device. | |
799 | * | |
800 | * Arguments: sdev - SCSI Device in question | |
801 | * depth - Current number of outstanding SCSI commands on | |
802 | * this device, not counting the one returned as | |
803 | * QUEUE_FULL. | |
804 | * | |
805 | * Returns: 0 - No change needed | |
806 | * >0 - Adjust queue depth to this new depth | |
807 | * -1 - Drop back to untagged operation using host->cmd_per_lun | |
808 | * as the untagged command depth | |
809 | * | |
810 | * Lock Status: None held on entry | |
811 | * | |
812 | * Notes: Low level drivers may call this at any time and we will do | |
813 | * "The Right Thing." We are interrupt context safe. | |
814 | */ | |
815 | int scsi_track_queue_full(struct scsi_device *sdev, int depth) | |
816 | { | |
817 | if ((jiffies >> 4) == sdev->last_queue_full_time) | |
818 | return 0; | |
819 | ||
820 | sdev->last_queue_full_time = (jiffies >> 4); | |
821 | if (sdev->last_queue_full_depth != depth) { | |
822 | sdev->last_queue_full_count = 1; | |
823 | sdev->last_queue_full_depth = depth; | |
824 | } else { | |
825 | sdev->last_queue_full_count++; | |
826 | } | |
827 | ||
828 | if (sdev->last_queue_full_count <= 10) | |
829 | return 0; | |
830 | if (sdev->last_queue_full_depth < 8) { | |
831 | /* Drop back to untagged */ | |
832 | scsi_adjust_queue_depth(sdev, 0, sdev->host->cmd_per_lun); | |
833 | return -1; | |
834 | } | |
835 | ||
836 | if (sdev->ordered_tags) | |
837 | scsi_adjust_queue_depth(sdev, MSG_ORDERED_TAG, depth); | |
838 | else | |
839 | scsi_adjust_queue_depth(sdev, MSG_SIMPLE_TAG, depth); | |
840 | return depth; | |
841 | } | |
842 | EXPORT_SYMBOL(scsi_track_queue_full); | |
843 | ||
844 | /** | |
845 | * scsi_device_get - get an addition reference to a scsi_device | |
846 | * @sdev: device to get a reference to | |
847 | * | |
848 | * Gets a reference to the scsi_device and increments the use count | |
849 | * of the underlying LLDD module. You must hold host_lock of the | |
850 | * parent Scsi_Host or already have a reference when calling this. | |
851 | */ | |
852 | int scsi_device_get(struct scsi_device *sdev) | |
853 | { | |
85b6c720 | 854 | if (sdev->sdev_state == SDEV_DEL) |
1da177e4 LT |
855 | return -ENXIO; |
856 | if (!get_device(&sdev->sdev_gendev)) | |
857 | return -ENXIO; | |
85b6c720 JB |
858 | /* We can fail this if we're doing SCSI operations |
859 | * from module exit (like cache flush) */ | |
860 | try_module_get(sdev->host->hostt->module); | |
861 | ||
1da177e4 LT |
862 | return 0; |
863 | } | |
864 | EXPORT_SYMBOL(scsi_device_get); | |
865 | ||
866 | /** | |
867 | * scsi_device_put - release a reference to a scsi_device | |
868 | * @sdev: device to release a reference on. | |
869 | * | |
870 | * Release a reference to the scsi_device and decrements the use count | |
871 | * of the underlying LLDD module. The device is freed once the last | |
872 | * user vanishes. | |
873 | */ | |
874 | void scsi_device_put(struct scsi_device *sdev) | |
875 | { | |
85b6c720 JB |
876 | /* The module refcount will be zero if scsi_device_get() |
877 | * was called from a module removal routine */ | |
878 | if (likely(module_refcount(sdev->host->hostt->module) != 0)) | |
879 | module_put(sdev->host->hostt->module); | |
1da177e4 LT |
880 | put_device(&sdev->sdev_gendev); |
881 | } | |
882 | EXPORT_SYMBOL(scsi_device_put); | |
883 | ||
884 | /* helper for shost_for_each_device, thus not documented */ | |
885 | struct scsi_device *__scsi_iterate_devices(struct Scsi_Host *shost, | |
886 | struct scsi_device *prev) | |
887 | { | |
888 | struct list_head *list = (prev ? &prev->siblings : &shost->__devices); | |
889 | struct scsi_device *next = NULL; | |
890 | unsigned long flags; | |
891 | ||
892 | spin_lock_irqsave(shost->host_lock, flags); | |
893 | while (list->next != &shost->__devices) { | |
894 | next = list_entry(list->next, struct scsi_device, siblings); | |
895 | /* skip devices that we can't get a reference to */ | |
896 | if (!scsi_device_get(next)) | |
897 | break; | |
898 | next = NULL; | |
899 | list = list->next; | |
900 | } | |
901 | spin_unlock_irqrestore(shost->host_lock, flags); | |
902 | ||
903 | if (prev) | |
904 | scsi_device_put(prev); | |
905 | return next; | |
906 | } | |
907 | EXPORT_SYMBOL(__scsi_iterate_devices); | |
908 | ||
909 | /** | |
910 | * starget_for_each_device - helper to walk all devices of a target | |
911 | * @starget: target whose devices we want to iterate over. | |
912 | * | |
913 | * This traverses over each devices of @shost. The devices have | |
914 | * a reference that must be released by scsi_host_put when breaking | |
915 | * out of the loop. | |
916 | */ | |
917 | void starget_for_each_device(struct scsi_target *starget, void * data, | |
918 | void (*fn)(struct scsi_device *, void *)) | |
919 | { | |
920 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
921 | struct scsi_device *sdev; | |
922 | ||
923 | shost_for_each_device(sdev, shost) { | |
924 | if ((sdev->channel == starget->channel) && | |
925 | (sdev->id == starget->id)) | |
926 | fn(sdev, data); | |
927 | } | |
928 | } | |
929 | EXPORT_SYMBOL(starget_for_each_device); | |
930 | ||
931 | /** | |
932 | * __scsi_device_lookup_by_target - find a device given the target (UNLOCKED) | |
933 | * @starget: SCSI target pointer | |
934 | * @lun: SCSI Logical Unit Number | |
935 | * | |
936 | * Looks up the scsi_device with the specified @lun for a give | |
937 | * @starget. The returned scsi_device does not have an additional | |
938 | * reference. You must hold the host's host_lock over this call and | |
939 | * any access to the returned scsi_device. | |
940 | * | |
941 | * Note: The only reason why drivers would want to use this is because | |
942 | * they're need to access the device list in irq context. Otherwise you | |
943 | * really want to use scsi_device_lookup_by_target instead. | |
944 | **/ | |
945 | struct scsi_device *__scsi_device_lookup_by_target(struct scsi_target *starget, | |
946 | uint lun) | |
947 | { | |
948 | struct scsi_device *sdev; | |
949 | ||
950 | list_for_each_entry(sdev, &starget->devices, same_target_siblings) { | |
951 | if (sdev->lun ==lun) | |
952 | return sdev; | |
953 | } | |
954 | ||
955 | return NULL; | |
956 | } | |
957 | EXPORT_SYMBOL(__scsi_device_lookup_by_target); | |
958 | ||
959 | /** | |
960 | * scsi_device_lookup_by_target - find a device given the target | |
961 | * @starget: SCSI target pointer | |
962 | * @lun: SCSI Logical Unit Number | |
963 | * | |
964 | * Looks up the scsi_device with the specified @channel, @id, @lun for a | |
965 | * give host. The returned scsi_device has an additional reference that | |
966 | * needs to be release with scsi_host_put once you're done with it. | |
967 | **/ | |
968 | struct scsi_device *scsi_device_lookup_by_target(struct scsi_target *starget, | |
969 | uint lun) | |
970 | { | |
971 | struct scsi_device *sdev; | |
972 | struct Scsi_Host *shost = dev_to_shost(starget->dev.parent); | |
973 | unsigned long flags; | |
974 | ||
975 | spin_lock_irqsave(shost->host_lock, flags); | |
976 | sdev = __scsi_device_lookup_by_target(starget, lun); | |
977 | if (sdev && scsi_device_get(sdev)) | |
978 | sdev = NULL; | |
979 | spin_unlock_irqrestore(shost->host_lock, flags); | |
980 | ||
981 | return sdev; | |
982 | } | |
983 | EXPORT_SYMBOL(scsi_device_lookup_by_target); | |
984 | ||
985 | /** | |
986 | * scsi_device_lookup - find a device given the host (UNLOCKED) | |
987 | * @shost: SCSI host pointer | |
988 | * @channel: SCSI channel (zero if only one channel) | |
989 | * @pun: SCSI target number (physical unit number) | |
990 | * @lun: SCSI Logical Unit Number | |
991 | * | |
992 | * Looks up the scsi_device with the specified @channel, @id, @lun for a | |
993 | * give host. The returned scsi_device does not have an additional reference. | |
994 | * You must hold the host's host_lock over this call and any access to the | |
995 | * returned scsi_device. | |
996 | * | |
997 | * Note: The only reason why drivers would want to use this is because | |
998 | * they're need to access the device list in irq context. Otherwise you | |
999 | * really want to use scsi_device_lookup instead. | |
1000 | **/ | |
1001 | struct scsi_device *__scsi_device_lookup(struct Scsi_Host *shost, | |
1002 | uint channel, uint id, uint lun) | |
1003 | { | |
1004 | struct scsi_device *sdev; | |
1005 | ||
1006 | list_for_each_entry(sdev, &shost->__devices, siblings) { | |
1007 | if (sdev->channel == channel && sdev->id == id && | |
1008 | sdev->lun ==lun) | |
1009 | return sdev; | |
1010 | } | |
1011 | ||
1012 | return NULL; | |
1013 | } | |
1014 | EXPORT_SYMBOL(__scsi_device_lookup); | |
1015 | ||
1016 | /** | |
1017 | * scsi_device_lookup - find a device given the host | |
1018 | * @shost: SCSI host pointer | |
1019 | * @channel: SCSI channel (zero if only one channel) | |
1020 | * @id: SCSI target number (physical unit number) | |
1021 | * @lun: SCSI Logical Unit Number | |
1022 | * | |
1023 | * Looks up the scsi_device with the specified @channel, @id, @lun for a | |
1024 | * give host. The returned scsi_device has an additional reference that | |
1025 | * needs to be release with scsi_host_put once you're done with it. | |
1026 | **/ | |
1027 | struct scsi_device *scsi_device_lookup(struct Scsi_Host *shost, | |
1028 | uint channel, uint id, uint lun) | |
1029 | { | |
1030 | struct scsi_device *sdev; | |
1031 | unsigned long flags; | |
1032 | ||
1033 | spin_lock_irqsave(shost->host_lock, flags); | |
1034 | sdev = __scsi_device_lookup(shost, channel, id, lun); | |
1035 | if (sdev && scsi_device_get(sdev)) | |
1036 | sdev = NULL; | |
1037 | spin_unlock_irqrestore(shost->host_lock, flags); | |
1038 | ||
1039 | return sdev; | |
1040 | } | |
1041 | EXPORT_SYMBOL(scsi_device_lookup); | |
1042 | ||
1043 | /** | |
1044 | * scsi_device_cancel - cancel outstanding IO to this device | |
1045 | * @sdev: Pointer to struct scsi_device | |
1046 | * @recovery: Boolean instructing function to recover device or not. | |
1047 | * | |
1048 | **/ | |
1049 | int scsi_device_cancel(struct scsi_device *sdev, int recovery) | |
1050 | { | |
1051 | struct scsi_cmnd *scmd; | |
1052 | LIST_HEAD(active_list); | |
1053 | struct list_head *lh, *lh_sf; | |
1054 | unsigned long flags; | |
1055 | ||
1056 | scsi_device_set_state(sdev, SDEV_CANCEL); | |
1057 | ||
1058 | spin_lock_irqsave(&sdev->list_lock, flags); | |
1059 | list_for_each_entry(scmd, &sdev->cmd_list, list) { | |
1060 | if (scmd->request && scmd->request->rq_status != RQ_INACTIVE) { | |
1061 | /* | |
1062 | * If we are unable to remove the timer, it means | |
1063 | * that the command has already timed out or | |
1064 | * finished. | |
1065 | */ | |
1066 | if (!scsi_delete_timer(scmd)) | |
1067 | continue; | |
1068 | list_add_tail(&scmd->eh_entry, &active_list); | |
1069 | } | |
1070 | } | |
1071 | spin_unlock_irqrestore(&sdev->list_lock, flags); | |
1072 | ||
1073 | if (!list_empty(&active_list)) { | |
1074 | list_for_each_safe(lh, lh_sf, &active_list) { | |
1075 | scmd = list_entry(lh, struct scsi_cmnd, eh_entry); | |
1076 | list_del_init(lh); | |
939647ee JB |
1077 | if (recovery && |
1078 | !scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD)) { | |
1da177e4 LT |
1079 | scmd->result = (DID_ABORT << 16); |
1080 | scsi_finish_command(scmd); | |
1081 | } | |
1082 | } | |
1083 | } | |
1084 | ||
1085 | return 0; | |
1086 | } | |
1087 | EXPORT_SYMBOL(scsi_device_cancel); | |
1088 | ||
1da177e4 LT |
1089 | MODULE_DESCRIPTION("SCSI core"); |
1090 | MODULE_LICENSE("GPL"); | |
1091 | ||
1092 | module_param(scsi_logging_level, int, S_IRUGO|S_IWUSR); | |
1093 | MODULE_PARM_DESC(scsi_logging_level, "a bit mask of logging levels"); | |
1094 | ||
1095 | static int __init init_scsi(void) | |
1096 | { | |
1097 | int error, i; | |
1098 | ||
1099 | error = scsi_init_queue(); | |
1100 | if (error) | |
1101 | return error; | |
1102 | error = scsi_init_procfs(); | |
1103 | if (error) | |
1104 | goto cleanup_queue; | |
1105 | error = scsi_init_devinfo(); | |
1106 | if (error) | |
1107 | goto cleanup_procfs; | |
1108 | error = scsi_init_hosts(); | |
1109 | if (error) | |
1110 | goto cleanup_devlist; | |
1111 | error = scsi_init_sysctl(); | |
1112 | if (error) | |
1113 | goto cleanup_hosts; | |
1114 | error = scsi_sysfs_register(); | |
1115 | if (error) | |
1116 | goto cleanup_sysctl; | |
1117 | ||
530bba6f | 1118 | for_each_possible_cpu(i) |
1da177e4 LT |
1119 | INIT_LIST_HEAD(&per_cpu(scsi_done_q, i)); |
1120 | ||
84314fd4 JS |
1121 | scsi_netlink_init(); |
1122 | ||
1da177e4 LT |
1123 | printk(KERN_NOTICE "SCSI subsystem initialized\n"); |
1124 | return 0; | |
1125 | ||
1126 | cleanup_sysctl: | |
1127 | scsi_exit_sysctl(); | |
1128 | cleanup_hosts: | |
1129 | scsi_exit_hosts(); | |
1130 | cleanup_devlist: | |
1131 | scsi_exit_devinfo(); | |
1132 | cleanup_procfs: | |
1133 | scsi_exit_procfs(); | |
1134 | cleanup_queue: | |
1135 | scsi_exit_queue(); | |
1136 | printk(KERN_ERR "SCSI subsystem failed to initialize, error = %d\n", | |
1137 | -error); | |
1138 | return error; | |
1139 | } | |
1140 | ||
1141 | static void __exit exit_scsi(void) | |
1142 | { | |
84314fd4 | 1143 | scsi_netlink_exit(); |
1da177e4 LT |
1144 | scsi_sysfs_unregister(); |
1145 | scsi_exit_sysctl(); | |
1146 | scsi_exit_hosts(); | |
1147 | scsi_exit_devinfo(); | |
1da177e4 LT |
1148 | scsi_exit_procfs(); |
1149 | scsi_exit_queue(); | |
1da177e4 LT |
1150 | } |
1151 | ||
1152 | subsys_initcall(init_scsi); | |
1153 | module_exit(exit_scsi); |