Commit | Line | Data |
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5a55c259 FT |
1 | /* |
2 | * SCSI target lib functions | |
3 | * | |
4 | * Copyright (C) 2005 Mike Christie <michaelc@cs.wisc.edu> | |
5 | * Copyright (C) 2005 FUJITA Tomonori <tomof@acm.org> | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU General Public License as | |
9 | * published by the Free Software Foundation; either version 2 of the | |
10 | * License, or (at your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
20 | * 02110-1301 USA | |
21 | */ | |
22 | #include <linux/blkdev.h> | |
23 | #include <linux/hash.h> | |
24 | #include <linux/module.h> | |
25 | #include <linux/pagemap.h> | |
26 | #include <scsi/scsi.h> | |
27 | #include <scsi/scsi_cmnd.h> | |
28 | #include <scsi/scsi_device.h> | |
29 | #include <scsi/scsi_host.h> | |
30 | #include <scsi/scsi_tgt.h> | |
5a55c259 FT |
31 | |
32 | #include "scsi_tgt_priv.h" | |
33 | ||
34 | static struct workqueue_struct *scsi_tgtd; | |
e18b890b | 35 | static struct kmem_cache *scsi_tgt_cmd_cache; |
5a55c259 FT |
36 | |
37 | /* | |
38 | * TODO: this struct will be killed when the block layer supports large bios | |
39 | * and James's work struct code is in | |
40 | */ | |
41 | struct scsi_tgt_cmd { | |
42 | /* TODO replace work with James b's code */ | |
43 | struct work_struct work; | |
181011e0 MC |
44 | /* TODO fix limits of some drivers */ |
45 | struct bio *bio; | |
5a55c259 FT |
46 | |
47 | struct list_head hash_list; | |
48 | struct request *rq; | |
49 | u64 tag; | |
5a55c259 FT |
50 | }; |
51 | ||
52 | #define TGT_HASH_ORDER 4 | |
53 | #define cmd_hashfn(tag) hash_long((unsigned long) (tag), TGT_HASH_ORDER) | |
54 | ||
55 | struct scsi_tgt_queuedata { | |
56 | struct Scsi_Host *shost; | |
57 | struct list_head cmd_hash[1 << TGT_HASH_ORDER]; | |
58 | spinlock_t cmd_hash_lock; | |
59 | }; | |
60 | ||
61 | /* | |
62 | * Function: scsi_host_get_command() | |
63 | * | |
64 | * Purpose: Allocate and setup a scsi command block and blk request | |
65 | * | |
66 | * Arguments: shost - scsi host | |
67 | * data_dir - dma data dir | |
68 | * gfp_mask- allocator flags | |
69 | * | |
70 | * Returns: The allocated scsi command structure. | |
71 | * | |
72 | * This should be called by target LLDs to get a command. | |
73 | */ | |
74 | struct scsi_cmnd *scsi_host_get_command(struct Scsi_Host *shost, | |
75 | enum dma_data_direction data_dir, | |
76 | gfp_t gfp_mask) | |
77 | { | |
78 | int write = (data_dir == DMA_TO_DEVICE); | |
79 | struct request *rq; | |
80 | struct scsi_cmnd *cmd; | |
81 | struct scsi_tgt_cmd *tcmd; | |
82 | ||
83 | /* Bail if we can't get a reference to the device */ | |
84 | if (!get_device(&shost->shost_gendev)) | |
85 | return NULL; | |
86 | ||
87 | tcmd = kmem_cache_alloc(scsi_tgt_cmd_cache, GFP_ATOMIC); | |
88 | if (!tcmd) | |
89 | goto put_dev; | |
90 | ||
181011e0 MC |
91 | /* |
92 | * The blk helpers are used to the READ/WRITE requests | |
93 | * transfering data from a initiator point of view. Since | |
94 | * we are in target mode we want the opposite. | |
95 | */ | |
96 | rq = blk_get_request(shost->uspace_req_q, !write, gfp_mask); | |
5a55c259 FT |
97 | if (!rq) |
98 | goto free_tcmd; | |
99 | ||
100 | cmd = __scsi_get_command(shost, gfp_mask); | |
101 | if (!cmd) | |
102 | goto release_rq; | |
103 | ||
104 | memset(cmd, 0, sizeof(*cmd)); | |
105 | cmd->sc_data_direction = data_dir; | |
106 | cmd->jiffies_at_alloc = jiffies; | |
107 | cmd->request = rq; | |
108 | ||
109 | rq->special = cmd; | |
110 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
111 | rq->cmd_flags |= REQ_TYPE_BLOCK_PC; | |
112 | rq->end_io_data = tcmd; | |
113 | ||
5a55c259 FT |
114 | tcmd->rq = rq; |
115 | ||
116 | return cmd; | |
117 | ||
118 | release_rq: | |
119 | blk_put_request(rq); | |
120 | free_tcmd: | |
121 | kmem_cache_free(scsi_tgt_cmd_cache, tcmd); | |
122 | put_dev: | |
123 | put_device(&shost->shost_gendev); | |
124 | return NULL; | |
125 | ||
126 | } | |
127 | EXPORT_SYMBOL_GPL(scsi_host_get_command); | |
128 | ||
129 | /* | |
130 | * Function: scsi_host_put_command() | |
131 | * | |
132 | * Purpose: Free a scsi command block | |
133 | * | |
134 | * Arguments: shost - scsi host | |
135 | * cmd - command block to free | |
136 | * | |
137 | * Returns: Nothing. | |
138 | * | |
139 | * Notes: The command must not belong to any lists. | |
140 | */ | |
141 | void scsi_host_put_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd) | |
142 | { | |
143 | struct request_queue *q = shost->uspace_req_q; | |
144 | struct request *rq = cmd->request; | |
145 | struct scsi_tgt_cmd *tcmd = rq->end_io_data; | |
146 | unsigned long flags; | |
147 | ||
148 | kmem_cache_free(scsi_tgt_cmd_cache, tcmd); | |
149 | ||
150 | spin_lock_irqsave(q->queue_lock, flags); | |
151 | __blk_put_request(q, rq); | |
152 | spin_unlock_irqrestore(q->queue_lock, flags); | |
153 | ||
154 | __scsi_put_command(shost, cmd, &shost->shost_gendev); | |
155 | } | |
156 | EXPORT_SYMBOL_GPL(scsi_host_put_command); | |
157 | ||
5a55c259 FT |
158 | static void cmd_hashlist_del(struct scsi_cmnd *cmd) |
159 | { | |
160 | struct request_queue *q = cmd->request->q; | |
161 | struct scsi_tgt_queuedata *qdata = q->queuedata; | |
162 | unsigned long flags; | |
163 | struct scsi_tgt_cmd *tcmd = cmd->request->end_io_data; | |
164 | ||
165 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); | |
166 | list_del(&tcmd->hash_list); | |
167 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
168 | } | |
169 | ||
181011e0 MC |
170 | static void scsi_unmap_user_pages(struct scsi_tgt_cmd *tcmd) |
171 | { | |
172 | blk_rq_unmap_user(tcmd->bio); | |
173 | } | |
174 | ||
06328b4f | 175 | static void scsi_tgt_cmd_destroy(struct work_struct *work) |
5a55c259 | 176 | { |
06328b4f DH |
177 | struct scsi_tgt_cmd *tcmd = |
178 | container_of(work, struct scsi_tgt_cmd, work); | |
179 | struct scsi_cmnd *cmd = tcmd->rq->special; | |
5a55c259 FT |
180 | |
181 | dprintk("cmd %p %d %lu\n", cmd, cmd->sc_data_direction, | |
182 | rq_data_dir(cmd->request)); | |
5a55c259 FT |
183 | scsi_unmap_user_pages(tcmd); |
184 | scsi_host_put_command(scsi_tgt_cmd_to_host(cmd), cmd); | |
185 | } | |
186 | ||
187 | static void init_scsi_tgt_cmd(struct request *rq, struct scsi_tgt_cmd *tcmd, | |
188 | u64 tag) | |
189 | { | |
190 | struct scsi_tgt_queuedata *qdata = rq->q->queuedata; | |
191 | unsigned long flags; | |
192 | struct list_head *head; | |
193 | ||
194 | tcmd->tag = tag; | |
181011e0 | 195 | tcmd->bio = NULL; |
06328b4f | 196 | INIT_WORK(&tcmd->work, scsi_tgt_cmd_destroy); |
5a55c259 FT |
197 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); |
198 | head = &qdata->cmd_hash[cmd_hashfn(tag)]; | |
199 | list_add(&tcmd->hash_list, head); | |
200 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
201 | } | |
202 | ||
203 | /* | |
204 | * scsi_tgt_alloc_queue - setup queue used for message passing | |
205 | * shost: scsi host | |
206 | * | |
207 | * This should be called by the LLD after host allocation. | |
208 | * And will be released when the host is released. | |
209 | */ | |
210 | int scsi_tgt_alloc_queue(struct Scsi_Host *shost) | |
211 | { | |
212 | struct scsi_tgt_queuedata *queuedata; | |
213 | struct request_queue *q; | |
214 | int err, i; | |
215 | ||
216 | /* | |
217 | * Do we need to send a netlink event or should uspace | |
218 | * just respond to the hotplug event? | |
219 | */ | |
220 | q = __scsi_alloc_queue(shost, NULL); | |
221 | if (!q) | |
222 | return -ENOMEM; | |
223 | ||
224 | queuedata = kzalloc(sizeof(*queuedata), GFP_KERNEL); | |
225 | if (!queuedata) { | |
226 | err = -ENOMEM; | |
227 | goto cleanup_queue; | |
228 | } | |
229 | queuedata->shost = shost; | |
230 | q->queuedata = queuedata; | |
231 | ||
232 | /* | |
233 | * this is a silly hack. We should probably just queue as many | |
234 | * command as is recvd to userspace. uspace can then make | |
235 | * sure we do not overload the HBA | |
236 | */ | |
237 | q->nr_requests = shost->hostt->can_queue; | |
238 | /* | |
239 | * We currently only support software LLDs so this does | |
240 | * not matter for now. Do we need this for the cards we support? | |
241 | * If so we should make it a host template value. | |
242 | */ | |
243 | blk_queue_dma_alignment(q, 0); | |
244 | shost->uspace_req_q = q; | |
245 | ||
246 | for (i = 0; i < ARRAY_SIZE(queuedata->cmd_hash); i++) | |
247 | INIT_LIST_HEAD(&queuedata->cmd_hash[i]); | |
248 | spin_lock_init(&queuedata->cmd_hash_lock); | |
249 | ||
250 | return 0; | |
251 | ||
252 | cleanup_queue: | |
253 | blk_cleanup_queue(q); | |
254 | return err; | |
255 | } | |
256 | EXPORT_SYMBOL_GPL(scsi_tgt_alloc_queue); | |
257 | ||
258 | void scsi_tgt_free_queue(struct Scsi_Host *shost) | |
259 | { | |
260 | int i; | |
261 | unsigned long flags; | |
262 | struct request_queue *q = shost->uspace_req_q; | |
263 | struct scsi_cmnd *cmd; | |
264 | struct scsi_tgt_queuedata *qdata = q->queuedata; | |
265 | struct scsi_tgt_cmd *tcmd, *n; | |
266 | LIST_HEAD(cmds); | |
267 | ||
268 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); | |
269 | ||
270 | for (i = 0; i < ARRAY_SIZE(qdata->cmd_hash); i++) { | |
271 | list_for_each_entry_safe(tcmd, n, &qdata->cmd_hash[i], | |
272 | hash_list) { | |
273 | list_del(&tcmd->hash_list); | |
274 | list_add(&tcmd->hash_list, &cmds); | |
275 | } | |
276 | } | |
277 | ||
278 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
279 | ||
280 | while (!list_empty(&cmds)) { | |
281 | tcmd = list_entry(cmds.next, struct scsi_tgt_cmd, hash_list); | |
282 | list_del(&tcmd->hash_list); | |
283 | cmd = tcmd->rq->special; | |
284 | ||
285 | shost->hostt->eh_abort_handler(cmd); | |
06328b4f | 286 | scsi_tgt_cmd_destroy(&tcmd->work); |
5a55c259 FT |
287 | } |
288 | } | |
289 | EXPORT_SYMBOL_GPL(scsi_tgt_free_queue); | |
290 | ||
291 | struct Scsi_Host *scsi_tgt_cmd_to_host(struct scsi_cmnd *cmd) | |
292 | { | |
293 | struct scsi_tgt_queuedata *queue = cmd->request->q->queuedata; | |
294 | return queue->shost; | |
295 | } | |
296 | EXPORT_SYMBOL_GPL(scsi_tgt_cmd_to_host); | |
297 | ||
298 | /* | |
299 | * scsi_tgt_queue_command - queue command for userspace processing | |
300 | * @cmd: scsi command | |
301 | * @scsilun: scsi lun | |
302 | * @tag: unique value to identify this command for tmf | |
303 | */ | |
304 | int scsi_tgt_queue_command(struct scsi_cmnd *cmd, struct scsi_lun *scsilun, | |
305 | u64 tag) | |
306 | { | |
307 | struct scsi_tgt_cmd *tcmd = cmd->request->end_io_data; | |
308 | int err; | |
309 | ||
310 | init_scsi_tgt_cmd(cmd->request, tcmd, tag); | |
311 | err = scsi_tgt_uspace_send_cmd(cmd, scsilun, tag); | |
312 | if (err) | |
313 | cmd_hashlist_del(cmd); | |
314 | ||
315 | return err; | |
316 | } | |
317 | EXPORT_SYMBOL_GPL(scsi_tgt_queue_command); | |
318 | ||
319 | /* | |
320 | * This is run from a interrpt handler normally and the unmap | |
321 | * needs process context so we must queue | |
322 | */ | |
323 | static void scsi_tgt_cmd_done(struct scsi_cmnd *cmd) | |
324 | { | |
325 | struct scsi_tgt_cmd *tcmd = cmd->request->end_io_data; | |
326 | ||
327 | dprintk("cmd %p %lu\n", cmd, rq_data_dir(cmd->request)); | |
328 | ||
329 | scsi_tgt_uspace_send_status(cmd, tcmd->tag); | |
bc7e380a FT |
330 | |
331 | if (cmd->request_buffer) | |
332 | scsi_free_sgtable(cmd->request_buffer, cmd->sglist_len); | |
333 | ||
5a55c259 FT |
334 | queue_work(scsi_tgtd, &tcmd->work); |
335 | } | |
336 | ||
bc7e380a | 337 | static int scsi_tgt_transfer_response(struct scsi_cmnd *cmd) |
5a55c259 FT |
338 | { |
339 | struct Scsi_Host *shost = scsi_tgt_cmd_to_host(cmd); | |
340 | int err; | |
341 | ||
342 | dprintk("cmd %p %lu\n", cmd, rq_data_dir(cmd->request)); | |
343 | ||
344 | err = shost->hostt->transfer_response(cmd, scsi_tgt_cmd_done); | |
345 | switch (err) { | |
346 | case SCSI_MLQUEUE_HOST_BUSY: | |
347 | case SCSI_MLQUEUE_DEVICE_BUSY: | |
348 | return -EAGAIN; | |
349 | } | |
5a55c259 FT |
350 | return 0; |
351 | } | |
352 | ||
5a55c259 FT |
353 | static int scsi_tgt_init_cmd(struct scsi_cmnd *cmd, gfp_t gfp_mask) |
354 | { | |
355 | struct request *rq = cmd->request; | |
5a55c259 FT |
356 | int count; |
357 | ||
358 | cmd->use_sg = rq->nr_phys_segments; | |
359 | cmd->request_buffer = scsi_alloc_sgtable(cmd, gfp_mask); | |
360 | if (!cmd->request_buffer) | |
361 | return -ENOMEM; | |
362 | ||
363 | cmd->request_bufflen = rq->data_len; | |
364 | ||
bc7e380a | 365 | dprintk("cmd %p cnt %d %lu\n", cmd, cmd->use_sg, rq_data_dir(rq)); |
5a55c259 FT |
366 | count = blk_rq_map_sg(rq->q, rq, cmd->request_buffer); |
367 | if (likely(count <= cmd->use_sg)) { | |
368 | cmd->use_sg = count; | |
369 | return 0; | |
370 | } | |
371 | ||
bc7e380a | 372 | eprintk("cmd %p cnt %d\n", cmd, cmd->use_sg); |
5a55c259 FT |
373 | scsi_free_sgtable(cmd->request_buffer, cmd->sglist_len); |
374 | return -EINVAL; | |
375 | } | |
376 | ||
377 | /* TODO: test this crap and replace bio_map_user with new interface maybe */ | |
378 | static int scsi_map_user_pages(struct scsi_tgt_cmd *tcmd, struct scsi_cmnd *cmd, | |
bc7e380a | 379 | unsigned long uaddr, unsigned int len, int rw) |
5a55c259 FT |
380 | { |
381 | struct request_queue *q = cmd->request->q; | |
382 | struct request *rq = cmd->request; | |
5a55c259 FT |
383 | int err; |
384 | ||
bc7e380a FT |
385 | dprintk("%lx %u\n", uaddr, len); |
386 | err = blk_rq_map_user(q, rq, (void *)uaddr, len); | |
181011e0 | 387 | if (err) { |
5a55c259 | 388 | /* |
181011e0 MC |
389 | * TODO: need to fixup sg_tablesize, max_segment_size, |
390 | * max_sectors, etc for modern HW and software drivers | |
391 | * where this value is bogus. | |
392 | * | |
393 | * TODO2: we can alloc a reserve buffer of max size | |
394 | * we can handle and do the slow copy path for really large | |
395 | * IO. | |
5a55c259 | 396 | */ |
181011e0 MC |
397 | eprintk("Could not handle request of size %u.\n", len); |
398 | return err; | |
5a55c259 FT |
399 | } |
400 | ||
181011e0 | 401 | tcmd->bio = rq->bio; |
5a55c259 FT |
402 | err = scsi_tgt_init_cmd(cmd, GFP_KERNEL); |
403 | if (err) | |
181011e0 | 404 | goto unmap_rq; |
5a55c259 FT |
405 | |
406 | return 0; | |
407 | ||
181011e0 MC |
408 | unmap_rq: |
409 | scsi_unmap_user_pages(tcmd); | |
5a55c259 FT |
410 | return err; |
411 | } | |
412 | ||
5a55c259 FT |
413 | static int scsi_tgt_copy_sense(struct scsi_cmnd *cmd, unsigned long uaddr, |
414 | unsigned len) | |
415 | { | |
416 | char __user *p = (char __user *) uaddr; | |
417 | ||
418 | if (copy_from_user(cmd->sense_buffer, p, | |
419 | min_t(unsigned, SCSI_SENSE_BUFFERSIZE, len))) { | |
420 | printk(KERN_ERR "Could not copy the sense buffer\n"); | |
421 | return -EIO; | |
422 | } | |
423 | return 0; | |
424 | } | |
425 | ||
426 | static int scsi_tgt_abort_cmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) | |
427 | { | |
06328b4f | 428 | struct scsi_tgt_cmd *tcmd; |
5a55c259 FT |
429 | int err; |
430 | ||
431 | err = shost->hostt->eh_abort_handler(cmd); | |
432 | if (err) | |
433 | eprintk("fail to abort %p\n", cmd); | |
434 | ||
06328b4f DH |
435 | tcmd = cmd->request->end_io_data; |
436 | scsi_tgt_cmd_destroy(&tcmd->work); | |
5a55c259 FT |
437 | return err; |
438 | } | |
439 | ||
440 | static struct request *tgt_cmd_hash_lookup(struct request_queue *q, u64 tag) | |
441 | { | |
442 | struct scsi_tgt_queuedata *qdata = q->queuedata; | |
443 | struct request *rq = NULL; | |
444 | struct list_head *head; | |
445 | struct scsi_tgt_cmd *tcmd; | |
446 | unsigned long flags; | |
447 | ||
448 | head = &qdata->cmd_hash[cmd_hashfn(tag)]; | |
449 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); | |
450 | list_for_each_entry(tcmd, head, hash_list) { | |
451 | if (tcmd->tag == tag) { | |
452 | rq = tcmd->rq; | |
453 | list_del(&tcmd->hash_list); | |
454 | break; | |
455 | } | |
456 | } | |
457 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
458 | ||
459 | return rq; | |
460 | } | |
461 | ||
bc7e380a FT |
462 | int scsi_tgt_kspace_exec(int host_no, int result, u64 tag, |
463 | unsigned long uaddr, u32 len, unsigned long sense_uaddr, | |
464 | u32 sense_len, u8 rw) | |
5a55c259 FT |
465 | { |
466 | struct Scsi_Host *shost; | |
467 | struct scsi_cmnd *cmd; | |
468 | struct request *rq; | |
469 | struct scsi_tgt_cmd *tcmd; | |
470 | int err = 0; | |
471 | ||
472 | dprintk("%d %llu %d %u %lx %u\n", host_no, (unsigned long long) tag, | |
473 | result, len, uaddr, rw); | |
474 | ||
475 | /* TODO: replace with a O(1) alg */ | |
476 | shost = scsi_host_lookup(host_no); | |
477 | if (IS_ERR(shost)) { | |
478 | printk(KERN_ERR "Could not find host no %d\n", host_no); | |
479 | return -EINVAL; | |
480 | } | |
481 | ||
482 | if (!shost->uspace_req_q) { | |
483 | printk(KERN_ERR "Not target scsi host %d\n", host_no); | |
484 | goto done; | |
485 | } | |
486 | ||
487 | rq = tgt_cmd_hash_lookup(shost->uspace_req_q, tag); | |
488 | if (!rq) { | |
489 | printk(KERN_ERR "Could not find tag %llu\n", | |
490 | (unsigned long long) tag); | |
491 | err = -EINVAL; | |
492 | goto done; | |
493 | } | |
494 | cmd = rq->special; | |
495 | ||
181011e0 MC |
496 | dprintk("cmd %p scb %x result %d len %d bufflen %u %lu %x\n", |
497 | cmd, cmd->cmnd[0], result, len, cmd->request_bufflen, | |
498 | rq_data_dir(rq), cmd->cmnd[0]); | |
5a55c259 FT |
499 | |
500 | if (result == TASK_ABORTED) { | |
501 | scsi_tgt_abort_cmd(shost, cmd); | |
502 | goto done; | |
503 | } | |
504 | /* | |
505 | * store the userspace values here, the working values are | |
506 | * in the request_* values | |
507 | */ | |
508 | tcmd = cmd->request->end_io_data; | |
5a55c259 FT |
509 | cmd->result = result; |
510 | ||
bc7e380a FT |
511 | if (cmd->result == SAM_STAT_CHECK_CONDITION) |
512 | scsi_tgt_copy_sense(cmd, sense_uaddr, sense_len); | |
5a55c259 | 513 | |
bc7e380a FT |
514 | if (len) { |
515 | err = scsi_map_user_pages(rq->end_io_data, cmd, uaddr, len, rw); | |
516 | if (err) { | |
517 | eprintk("%p %d\n", cmd, err); | |
518 | err = -EAGAIN; | |
519 | goto done; | |
520 | } | |
5a55c259 | 521 | } |
bc7e380a | 522 | err = scsi_tgt_transfer_response(cmd); |
5a55c259 FT |
523 | done: |
524 | scsi_host_put(shost); | |
525 | return err; | |
526 | } | |
527 | ||
528 | int scsi_tgt_tsk_mgmt_request(struct Scsi_Host *shost, int function, u64 tag, | |
529 | struct scsi_lun *scsilun, void *data) | |
530 | { | |
531 | int err; | |
532 | ||
533 | /* TODO: need to retry if this fails. */ | |
534 | err = scsi_tgt_uspace_send_tsk_mgmt(shost->host_no, function, | |
535 | tag, scsilun, data); | |
536 | if (err < 0) | |
537 | eprintk("The task management request lost!\n"); | |
538 | return err; | |
539 | } | |
540 | EXPORT_SYMBOL_GPL(scsi_tgt_tsk_mgmt_request); | |
541 | ||
542 | int scsi_tgt_kspace_tsk_mgmt(int host_no, u64 mid, int result) | |
543 | { | |
544 | struct Scsi_Host *shost; | |
545 | int err = -EINVAL; | |
546 | ||
547 | dprintk("%d %d %llx\n", host_no, result, (unsigned long long) mid); | |
548 | ||
549 | shost = scsi_host_lookup(host_no); | |
550 | if (IS_ERR(shost)) { | |
551 | printk(KERN_ERR "Could not find host no %d\n", host_no); | |
552 | return err; | |
553 | } | |
554 | ||
555 | if (!shost->uspace_req_q) { | |
556 | printk(KERN_ERR "Not target scsi host %d\n", host_no); | |
557 | goto done; | |
558 | } | |
559 | ||
560 | err = shost->hostt->tsk_mgmt_response(mid, result); | |
561 | done: | |
562 | scsi_host_put(shost); | |
563 | return err; | |
564 | } | |
565 | ||
566 | static int __init scsi_tgt_init(void) | |
567 | { | |
568 | int err; | |
569 | ||
570 | scsi_tgt_cmd_cache = kmem_cache_create("scsi_tgt_cmd", | |
571 | sizeof(struct scsi_tgt_cmd), | |
572 | 0, 0, NULL, NULL); | |
573 | if (!scsi_tgt_cmd_cache) | |
574 | return -ENOMEM; | |
575 | ||
576 | scsi_tgtd = create_workqueue("scsi_tgtd"); | |
577 | if (!scsi_tgtd) { | |
578 | err = -ENOMEM; | |
579 | goto free_kmemcache; | |
580 | } | |
581 | ||
582 | err = scsi_tgt_if_init(); | |
583 | if (err) | |
584 | goto destroy_wq; | |
585 | ||
586 | return 0; | |
587 | ||
588 | destroy_wq: | |
589 | destroy_workqueue(scsi_tgtd); | |
590 | free_kmemcache: | |
591 | kmem_cache_destroy(scsi_tgt_cmd_cache); | |
592 | return err; | |
593 | } | |
594 | ||
595 | static void __exit scsi_tgt_exit(void) | |
596 | { | |
597 | destroy_workqueue(scsi_tgtd); | |
598 | scsi_tgt_if_exit(); | |
599 | kmem_cache_destroy(scsi_tgt_cmd_cache); | |
600 | } | |
601 | ||
602 | module_init(scsi_tgt_init); | |
603 | module_exit(scsi_tgt_exit); | |
604 | ||
605 | MODULE_DESCRIPTION("SCSI target core"); | |
606 | MODULE_LICENSE("GPL"); |