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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> | |
2c47f9ef | 30 | #include <scsi/scsi_transport.h> |
5a55c259 | 31 | #include <scsi/scsi_tgt.h> |
5a55c259 FT |
32 | |
33 | #include "scsi_tgt_priv.h" | |
34 | ||
35 | static struct workqueue_struct *scsi_tgtd; | |
e18b890b | 36 | static struct kmem_cache *scsi_tgt_cmd_cache; |
5a55c259 FT |
37 | |
38 | /* | |
39 | * TODO: this struct will be killed when the block layer supports large bios | |
40 | * and James's work struct code is in | |
41 | */ | |
42 | struct scsi_tgt_cmd { | |
43 | /* TODO replace work with James b's code */ | |
44 | struct work_struct work; | |
181011e0 MC |
45 | /* TODO fix limits of some drivers */ |
46 | struct bio *bio; | |
5a55c259 FT |
47 | |
48 | struct list_head hash_list; | |
49 | struct request *rq; | |
2c47f9ef | 50 | u64 itn_id; |
5a55c259 | 51 | u64 tag; |
5a55c259 FT |
52 | }; |
53 | ||
54 | #define TGT_HASH_ORDER 4 | |
55 | #define cmd_hashfn(tag) hash_long((unsigned long) (tag), TGT_HASH_ORDER) | |
56 | ||
57 | struct scsi_tgt_queuedata { | |
58 | struct Scsi_Host *shost; | |
59 | struct list_head cmd_hash[1 << TGT_HASH_ORDER]; | |
60 | spinlock_t cmd_hash_lock; | |
61 | }; | |
62 | ||
63 | /* | |
64 | * Function: scsi_host_get_command() | |
65 | * | |
66 | * Purpose: Allocate and setup a scsi command block and blk request | |
67 | * | |
68 | * Arguments: shost - scsi host | |
69 | * data_dir - dma data dir | |
70 | * gfp_mask- allocator flags | |
71 | * | |
72 | * Returns: The allocated scsi command structure. | |
73 | * | |
74 | * This should be called by target LLDs to get a command. | |
75 | */ | |
76 | struct scsi_cmnd *scsi_host_get_command(struct Scsi_Host *shost, | |
77 | enum dma_data_direction data_dir, | |
78 | gfp_t gfp_mask) | |
79 | { | |
80 | int write = (data_dir == DMA_TO_DEVICE); | |
81 | struct request *rq; | |
82 | struct scsi_cmnd *cmd; | |
83 | struct scsi_tgt_cmd *tcmd; | |
84 | ||
85 | /* Bail if we can't get a reference to the device */ | |
86 | if (!get_device(&shost->shost_gendev)) | |
87 | return NULL; | |
88 | ||
89 | tcmd = kmem_cache_alloc(scsi_tgt_cmd_cache, GFP_ATOMIC); | |
90 | if (!tcmd) | |
91 | goto put_dev; | |
92 | ||
181011e0 MC |
93 | /* |
94 | * The blk helpers are used to the READ/WRITE requests | |
95 | * transfering data from a initiator point of view. Since | |
96 | * we are in target mode we want the opposite. | |
97 | */ | |
98 | rq = blk_get_request(shost->uspace_req_q, !write, gfp_mask); | |
5a55c259 FT |
99 | if (!rq) |
100 | goto free_tcmd; | |
101 | ||
102 | cmd = __scsi_get_command(shost, gfp_mask); | |
103 | if (!cmd) | |
104 | goto release_rq; | |
105 | ||
5a55c259 FT |
106 | cmd->sc_data_direction = data_dir; |
107 | cmd->jiffies_at_alloc = jiffies; | |
108 | cmd->request = rq; | |
109 | ||
110 | rq->special = cmd; | |
111 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
112 | rq->cmd_flags |= REQ_TYPE_BLOCK_PC; | |
113 | rq->end_io_data = tcmd; | |
114 | ||
5a55c259 FT |
115 | tcmd->rq = rq; |
116 | ||
117 | return cmd; | |
118 | ||
119 | release_rq: | |
120 | blk_put_request(rq); | |
121 | free_tcmd: | |
122 | kmem_cache_free(scsi_tgt_cmd_cache, tcmd); | |
123 | put_dev: | |
124 | put_device(&shost->shost_gendev); | |
125 | return NULL; | |
126 | ||
127 | } | |
128 | EXPORT_SYMBOL_GPL(scsi_host_get_command); | |
129 | ||
130 | /* | |
131 | * Function: scsi_host_put_command() | |
132 | * | |
133 | * Purpose: Free a scsi command block | |
134 | * | |
135 | * Arguments: shost - scsi host | |
136 | * cmd - command block to free | |
137 | * | |
138 | * Returns: Nothing. | |
139 | * | |
140 | * Notes: The command must not belong to any lists. | |
141 | */ | |
142 | void scsi_host_put_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd) | |
143 | { | |
144 | struct request_queue *q = shost->uspace_req_q; | |
145 | struct request *rq = cmd->request; | |
146 | struct scsi_tgt_cmd *tcmd = rq->end_io_data; | |
147 | unsigned long flags; | |
148 | ||
149 | kmem_cache_free(scsi_tgt_cmd_cache, tcmd); | |
150 | ||
151 | spin_lock_irqsave(q->queue_lock, flags); | |
152 | __blk_put_request(q, rq); | |
153 | spin_unlock_irqrestore(q->queue_lock, flags); | |
154 | ||
155 | __scsi_put_command(shost, cmd, &shost->shost_gendev); | |
156 | } | |
157 | EXPORT_SYMBOL_GPL(scsi_host_put_command); | |
158 | ||
5a55c259 FT |
159 | static void cmd_hashlist_del(struct scsi_cmnd *cmd) |
160 | { | |
161 | struct request_queue *q = cmd->request->q; | |
162 | struct scsi_tgt_queuedata *qdata = q->queuedata; | |
163 | unsigned long flags; | |
164 | struct scsi_tgt_cmd *tcmd = cmd->request->end_io_data; | |
165 | ||
166 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); | |
167 | list_del(&tcmd->hash_list); | |
168 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
169 | } | |
170 | ||
181011e0 MC |
171 | static void scsi_unmap_user_pages(struct scsi_tgt_cmd *tcmd) |
172 | { | |
173 | blk_rq_unmap_user(tcmd->bio); | |
174 | } | |
175 | ||
06328b4f | 176 | static void scsi_tgt_cmd_destroy(struct work_struct *work) |
5a55c259 | 177 | { |
06328b4f DH |
178 | struct scsi_tgt_cmd *tcmd = |
179 | container_of(work, struct scsi_tgt_cmd, work); | |
180 | struct scsi_cmnd *cmd = tcmd->rq->special; | |
5a55c259 | 181 | |
a8aae4d3 | 182 | dprintk("cmd %p %d %u\n", cmd, cmd->sc_data_direction, |
5a55c259 | 183 | rq_data_dir(cmd->request)); |
5a55c259 FT |
184 | scsi_unmap_user_pages(tcmd); |
185 | scsi_host_put_command(scsi_tgt_cmd_to_host(cmd), cmd); | |
186 | } | |
187 | ||
188 | static void init_scsi_tgt_cmd(struct request *rq, struct scsi_tgt_cmd *tcmd, | |
2c47f9ef | 189 | u64 itn_id, u64 tag) |
5a55c259 FT |
190 | { |
191 | struct scsi_tgt_queuedata *qdata = rq->q->queuedata; | |
192 | unsigned long flags; | |
193 | struct list_head *head; | |
194 | ||
2c47f9ef | 195 | tcmd->itn_id = itn_id; |
5a55c259 | 196 | tcmd->tag = tag; |
181011e0 | 197 | tcmd->bio = NULL; |
06328b4f | 198 | INIT_WORK(&tcmd->work, scsi_tgt_cmd_destroy); |
5a55c259 FT |
199 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); |
200 | head = &qdata->cmd_hash[cmd_hashfn(tag)]; | |
201 | list_add(&tcmd->hash_list, head); | |
202 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
203 | } | |
204 | ||
205 | /* | |
206 | * scsi_tgt_alloc_queue - setup queue used for message passing | |
207 | * shost: scsi host | |
208 | * | |
209 | * This should be called by the LLD after host allocation. | |
210 | * And will be released when the host is released. | |
211 | */ | |
212 | int scsi_tgt_alloc_queue(struct Scsi_Host *shost) | |
213 | { | |
214 | struct scsi_tgt_queuedata *queuedata; | |
215 | struct request_queue *q; | |
216 | int err, i; | |
217 | ||
218 | /* | |
219 | * Do we need to send a netlink event or should uspace | |
220 | * just respond to the hotplug event? | |
221 | */ | |
222 | q = __scsi_alloc_queue(shost, NULL); | |
223 | if (!q) | |
224 | return -ENOMEM; | |
225 | ||
226 | queuedata = kzalloc(sizeof(*queuedata), GFP_KERNEL); | |
227 | if (!queuedata) { | |
228 | err = -ENOMEM; | |
229 | goto cleanup_queue; | |
230 | } | |
231 | queuedata->shost = shost; | |
232 | q->queuedata = queuedata; | |
233 | ||
234 | /* | |
235 | * this is a silly hack. We should probably just queue as many | |
236 | * command as is recvd to userspace. uspace can then make | |
237 | * sure we do not overload the HBA | |
238 | */ | |
8184fe9b | 239 | q->nr_requests = shost->can_queue; |
5a55c259 FT |
240 | /* |
241 | * We currently only support software LLDs so this does | |
242 | * not matter for now. Do we need this for the cards we support? | |
243 | * If so we should make it a host template value. | |
244 | */ | |
245 | blk_queue_dma_alignment(q, 0); | |
246 | shost->uspace_req_q = q; | |
247 | ||
248 | for (i = 0; i < ARRAY_SIZE(queuedata->cmd_hash); i++) | |
249 | INIT_LIST_HEAD(&queuedata->cmd_hash[i]); | |
250 | spin_lock_init(&queuedata->cmd_hash_lock); | |
251 | ||
252 | return 0; | |
253 | ||
254 | cleanup_queue: | |
255 | blk_cleanup_queue(q); | |
256 | return err; | |
257 | } | |
258 | EXPORT_SYMBOL_GPL(scsi_tgt_alloc_queue); | |
259 | ||
260 | void scsi_tgt_free_queue(struct Scsi_Host *shost) | |
261 | { | |
262 | int i; | |
263 | unsigned long flags; | |
264 | struct request_queue *q = shost->uspace_req_q; | |
265 | struct scsi_cmnd *cmd; | |
266 | struct scsi_tgt_queuedata *qdata = q->queuedata; | |
267 | struct scsi_tgt_cmd *tcmd, *n; | |
268 | LIST_HEAD(cmds); | |
269 | ||
270 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); | |
271 | ||
272 | for (i = 0; i < ARRAY_SIZE(qdata->cmd_hash); i++) { | |
273 | list_for_each_entry_safe(tcmd, n, &qdata->cmd_hash[i], | |
274 | hash_list) { | |
275 | list_del(&tcmd->hash_list); | |
276 | list_add(&tcmd->hash_list, &cmds); | |
277 | } | |
278 | } | |
279 | ||
280 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
281 | ||
282 | while (!list_empty(&cmds)) { | |
283 | tcmd = list_entry(cmds.next, struct scsi_tgt_cmd, hash_list); | |
284 | list_del(&tcmd->hash_list); | |
285 | cmd = tcmd->rq->special; | |
286 | ||
287 | shost->hostt->eh_abort_handler(cmd); | |
06328b4f | 288 | scsi_tgt_cmd_destroy(&tcmd->work); |
5a55c259 FT |
289 | } |
290 | } | |
291 | EXPORT_SYMBOL_GPL(scsi_tgt_free_queue); | |
292 | ||
293 | struct Scsi_Host *scsi_tgt_cmd_to_host(struct scsi_cmnd *cmd) | |
294 | { | |
295 | struct scsi_tgt_queuedata *queue = cmd->request->q->queuedata; | |
296 | return queue->shost; | |
297 | } | |
298 | EXPORT_SYMBOL_GPL(scsi_tgt_cmd_to_host); | |
299 | ||
300 | /* | |
301 | * scsi_tgt_queue_command - queue command for userspace processing | |
302 | * @cmd: scsi command | |
303 | * @scsilun: scsi lun | |
304 | * @tag: unique value to identify this command for tmf | |
305 | */ | |
2c47f9ef FT |
306 | int scsi_tgt_queue_command(struct scsi_cmnd *cmd, u64 itn_id, |
307 | struct scsi_lun *scsilun, u64 tag) | |
5a55c259 FT |
308 | { |
309 | struct scsi_tgt_cmd *tcmd = cmd->request->end_io_data; | |
310 | int err; | |
311 | ||
2c47f9ef FT |
312 | init_scsi_tgt_cmd(cmd->request, tcmd, itn_id, tag); |
313 | err = scsi_tgt_uspace_send_cmd(cmd, itn_id, scsilun, tag); | |
5a55c259 FT |
314 | if (err) |
315 | cmd_hashlist_del(cmd); | |
316 | ||
317 | return err; | |
318 | } | |
319 | EXPORT_SYMBOL_GPL(scsi_tgt_queue_command); | |
320 | ||
321 | /* | |
b1c11812 | 322 | * This is run from a interrupt handler normally and the unmap |
5a55c259 FT |
323 | * needs process context so we must queue |
324 | */ | |
325 | static void scsi_tgt_cmd_done(struct scsi_cmnd *cmd) | |
326 | { | |
327 | struct scsi_tgt_cmd *tcmd = cmd->request->end_io_data; | |
328 | ||
a8aae4d3 | 329 | dprintk("cmd %p %u\n", cmd, rq_data_dir(cmd->request)); |
5a55c259 | 330 | |
2c47f9ef | 331 | scsi_tgt_uspace_send_status(cmd, tcmd->itn_id, tcmd->tag); |
bc7e380a | 332 | |
bb52d82f | 333 | scsi_release_buffers(cmd); |
bc7e380a | 334 | |
5a55c259 FT |
335 | queue_work(scsi_tgtd, &tcmd->work); |
336 | } | |
337 | ||
bc7e380a | 338 | static int scsi_tgt_transfer_response(struct scsi_cmnd *cmd) |
5a55c259 FT |
339 | { |
340 | struct Scsi_Host *shost = scsi_tgt_cmd_to_host(cmd); | |
341 | int err; | |
342 | ||
a8aae4d3 | 343 | dprintk("cmd %p %u\n", cmd, rq_data_dir(cmd->request)); |
5a55c259 FT |
344 | |
345 | err = shost->hostt->transfer_response(cmd, scsi_tgt_cmd_done); | |
346 | switch (err) { | |
347 | case SCSI_MLQUEUE_HOST_BUSY: | |
348 | case SCSI_MLQUEUE_DEVICE_BUSY: | |
349 | return -EAGAIN; | |
350 | } | |
5a55c259 FT |
351 | return 0; |
352 | } | |
353 | ||
5a55c259 FT |
354 | /* TODO: test this crap and replace bio_map_user with new interface maybe */ |
355 | static int scsi_map_user_pages(struct scsi_tgt_cmd *tcmd, struct scsi_cmnd *cmd, | |
bc7e380a | 356 | unsigned long uaddr, unsigned int len, int rw) |
5a55c259 FT |
357 | { |
358 | struct request_queue *q = cmd->request->q; | |
359 | struct request *rq = cmd->request; | |
5a55c259 FT |
360 | int err; |
361 | ||
bc7e380a FT |
362 | dprintk("%lx %u\n", uaddr, len); |
363 | err = blk_rq_map_user(q, rq, (void *)uaddr, len); | |
181011e0 | 364 | if (err) { |
5a55c259 | 365 | /* |
181011e0 MC |
366 | * TODO: need to fixup sg_tablesize, max_segment_size, |
367 | * max_sectors, etc for modern HW and software drivers | |
368 | * where this value is bogus. | |
369 | * | |
370 | * TODO2: we can alloc a reserve buffer of max size | |
371 | * we can handle and do the slow copy path for really large | |
372 | * IO. | |
5a55c259 | 373 | */ |
181011e0 MC |
374 | eprintk("Could not handle request of size %u.\n", len); |
375 | return err; | |
5a55c259 FT |
376 | } |
377 | ||
181011e0 | 378 | tcmd->bio = rq->bio; |
bb52d82f BH |
379 | err = scsi_init_io(cmd, GFP_KERNEL); |
380 | if (err) { | |
381 | scsi_release_buffers(cmd); | |
181011e0 | 382 | goto unmap_rq; |
bb52d82f | 383 | } |
cccddc2d FT |
384 | /* |
385 | * we use REQ_TYPE_BLOCK_PC so scsi_init_io doesn't set the | |
386 | * length for us. | |
387 | */ | |
388 | cmd->sdb.length = rq->data_len; | |
5a55c259 FT |
389 | |
390 | return 0; | |
391 | ||
181011e0 MC |
392 | unmap_rq: |
393 | scsi_unmap_user_pages(tcmd); | |
5a55c259 FT |
394 | return err; |
395 | } | |
396 | ||
5a55c259 FT |
397 | static int scsi_tgt_copy_sense(struct scsi_cmnd *cmd, unsigned long uaddr, |
398 | unsigned len) | |
399 | { | |
400 | char __user *p = (char __user *) uaddr; | |
401 | ||
402 | if (copy_from_user(cmd->sense_buffer, p, | |
403 | min_t(unsigned, SCSI_SENSE_BUFFERSIZE, len))) { | |
404 | printk(KERN_ERR "Could not copy the sense buffer\n"); | |
405 | return -EIO; | |
406 | } | |
407 | return 0; | |
408 | } | |
409 | ||
410 | static int scsi_tgt_abort_cmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) | |
411 | { | |
06328b4f | 412 | struct scsi_tgt_cmd *tcmd; |
5a55c259 FT |
413 | int err; |
414 | ||
415 | err = shost->hostt->eh_abort_handler(cmd); | |
416 | if (err) | |
417 | eprintk("fail to abort %p\n", cmd); | |
418 | ||
06328b4f DH |
419 | tcmd = cmd->request->end_io_data; |
420 | scsi_tgt_cmd_destroy(&tcmd->work); | |
5a55c259 FT |
421 | return err; |
422 | } | |
423 | ||
424 | static struct request *tgt_cmd_hash_lookup(struct request_queue *q, u64 tag) | |
425 | { | |
426 | struct scsi_tgt_queuedata *qdata = q->queuedata; | |
427 | struct request *rq = NULL; | |
428 | struct list_head *head; | |
429 | struct scsi_tgt_cmd *tcmd; | |
430 | unsigned long flags; | |
431 | ||
432 | head = &qdata->cmd_hash[cmd_hashfn(tag)]; | |
433 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); | |
434 | list_for_each_entry(tcmd, head, hash_list) { | |
435 | if (tcmd->tag == tag) { | |
436 | rq = tcmd->rq; | |
437 | list_del(&tcmd->hash_list); | |
438 | break; | |
439 | } | |
440 | } | |
441 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
442 | ||
443 | return rq; | |
444 | } | |
445 | ||
2c47f9ef | 446 | int scsi_tgt_kspace_exec(int host_no, u64 itn_id, int result, u64 tag, |
bc7e380a FT |
447 | unsigned long uaddr, u32 len, unsigned long sense_uaddr, |
448 | u32 sense_len, u8 rw) | |
5a55c259 FT |
449 | { |
450 | struct Scsi_Host *shost; | |
451 | struct scsi_cmnd *cmd; | |
452 | struct request *rq; | |
453 | struct scsi_tgt_cmd *tcmd; | |
454 | int err = 0; | |
455 | ||
456 | dprintk("%d %llu %d %u %lx %u\n", host_no, (unsigned long long) tag, | |
457 | result, len, uaddr, rw); | |
458 | ||
459 | /* TODO: replace with a O(1) alg */ | |
460 | shost = scsi_host_lookup(host_no); | |
461 | if (IS_ERR(shost)) { | |
462 | printk(KERN_ERR "Could not find host no %d\n", host_no); | |
463 | return -EINVAL; | |
464 | } | |
465 | ||
466 | if (!shost->uspace_req_q) { | |
467 | printk(KERN_ERR "Not target scsi host %d\n", host_no); | |
468 | goto done; | |
469 | } | |
470 | ||
471 | rq = tgt_cmd_hash_lookup(shost->uspace_req_q, tag); | |
472 | if (!rq) { | |
473 | printk(KERN_ERR "Could not find tag %llu\n", | |
474 | (unsigned long long) tag); | |
475 | err = -EINVAL; | |
476 | goto done; | |
477 | } | |
478 | cmd = rq->special; | |
479 | ||
a8aae4d3 RD |
480 | dprintk("cmd %p scb %x result %d len %d bufflen %u %u %x\n", |
481 | cmd, cmd->cmnd[0], result, len, scsi_bufflen(cmd), | |
181011e0 | 482 | rq_data_dir(rq), cmd->cmnd[0]); |
5a55c259 FT |
483 | |
484 | if (result == TASK_ABORTED) { | |
485 | scsi_tgt_abort_cmd(shost, cmd); | |
486 | goto done; | |
487 | } | |
488 | /* | |
489 | * store the userspace values here, the working values are | |
490 | * in the request_* values | |
491 | */ | |
492 | tcmd = cmd->request->end_io_data; | |
5a55c259 FT |
493 | cmd->result = result; |
494 | ||
bc7e380a FT |
495 | if (cmd->result == SAM_STAT_CHECK_CONDITION) |
496 | scsi_tgt_copy_sense(cmd, sense_uaddr, sense_len); | |
5a55c259 | 497 | |
bc7e380a FT |
498 | if (len) { |
499 | err = scsi_map_user_pages(rq->end_io_data, cmd, uaddr, len, rw); | |
500 | if (err) { | |
e8f8248c FT |
501 | /* |
502 | * user-space daemon bugs or OOM | |
503 | * TODO: we can do better for OOM. | |
504 | */ | |
a52decaf FT |
505 | struct scsi_tgt_queuedata *qdata; |
506 | struct list_head *head; | |
507 | unsigned long flags; | |
508 | ||
e8f8248c FT |
509 | eprintk("cmd %p ret %d uaddr %lx len %d rw %d\n", |
510 | cmd, err, uaddr, len, rw); | |
a52decaf FT |
511 | |
512 | qdata = shost->uspace_req_q->queuedata; | |
513 | head = &qdata->cmd_hash[cmd_hashfn(tcmd->tag)]; | |
514 | ||
515 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); | |
516 | list_add(&tcmd->hash_list, head); | |
517 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
518 | ||
519 | goto done; | |
bc7e380a | 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 | ||
2c47f9ef FT |
528 | int scsi_tgt_tsk_mgmt_request(struct Scsi_Host *shost, u64 itn_id, |
529 | int function, u64 tag, struct scsi_lun *scsilun, | |
530 | void *data) | |
5a55c259 FT |
531 | { |
532 | int err; | |
533 | ||
534 | /* TODO: need to retry if this fails. */ | |
2c47f9ef FT |
535 | err = scsi_tgt_uspace_send_tsk_mgmt(shost->host_no, itn_id, |
536 | function, tag, scsilun, data); | |
5a55c259 FT |
537 | if (err < 0) |
538 | eprintk("The task management request lost!\n"); | |
539 | return err; | |
540 | } | |
541 | EXPORT_SYMBOL_GPL(scsi_tgt_tsk_mgmt_request); | |
542 | ||
2c47f9ef | 543 | int scsi_tgt_kspace_tsk_mgmt(int host_no, u64 itn_id, u64 mid, int result) |
5a55c259 FT |
544 | { |
545 | struct Scsi_Host *shost; | |
546 | int err = -EINVAL; | |
547 | ||
548 | dprintk("%d %d %llx\n", host_no, result, (unsigned long long) mid); | |
549 | ||
550 | shost = scsi_host_lookup(host_no); | |
551 | if (IS_ERR(shost)) { | |
552 | printk(KERN_ERR "Could not find host no %d\n", host_no); | |
553 | return err; | |
554 | } | |
555 | ||
556 | if (!shost->uspace_req_q) { | |
557 | printk(KERN_ERR "Not target scsi host %d\n", host_no); | |
558 | goto done; | |
559 | } | |
560 | ||
bfb74374 | 561 | err = shost->transportt->tsk_mgmt_response(shost, itn_id, mid, result); |
2c47f9ef FT |
562 | done: |
563 | scsi_host_put(shost); | |
564 | return err; | |
565 | } | |
566 | ||
567 | int scsi_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id, | |
568 | char *initiator) | |
569 | { | |
570 | int err; | |
571 | ||
572 | /* TODO: need to retry if this fails. */ | |
573 | err = scsi_tgt_uspace_send_it_nexus_request(shost->host_no, itn_id, 0, | |
574 | initiator); | |
575 | if (err < 0) | |
576 | eprintk("The i_t_neuxs request lost, %d %llx!\n", | |
577 | shost->host_no, (unsigned long long)itn_id); | |
578 | return err; | |
579 | } | |
580 | EXPORT_SYMBOL_GPL(scsi_tgt_it_nexus_create); | |
581 | ||
582 | int scsi_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id) | |
583 | { | |
584 | int err; | |
585 | ||
586 | /* TODO: need to retry if this fails. */ | |
587 | err = scsi_tgt_uspace_send_it_nexus_request(shost->host_no, | |
588 | itn_id, 1, NULL); | |
589 | if (err < 0) | |
590 | eprintk("The i_t_neuxs request lost, %d %llx!\n", | |
591 | shost->host_no, (unsigned long long)itn_id); | |
592 | return err; | |
593 | } | |
594 | EXPORT_SYMBOL_GPL(scsi_tgt_it_nexus_destroy); | |
595 | ||
596 | int scsi_tgt_kspace_it_nexus_rsp(int host_no, u64 itn_id, int result) | |
597 | { | |
598 | struct Scsi_Host *shost; | |
599 | int err = -EINVAL; | |
600 | ||
a8aae4d3 | 601 | dprintk("%d %d%llx\n", host_no, result, (unsigned long long)itn_id); |
2c47f9ef FT |
602 | |
603 | shost = scsi_host_lookup(host_no); | |
604 | if (IS_ERR(shost)) { | |
605 | printk(KERN_ERR "Could not find host no %d\n", host_no); | |
606 | return err; | |
607 | } | |
608 | ||
609 | if (!shost->uspace_req_q) { | |
610 | printk(KERN_ERR "Not target scsi host %d\n", host_no); | |
611 | goto done; | |
612 | } | |
613 | ||
614 | err = shost->transportt->it_nexus_response(shost, itn_id, result); | |
5a55c259 FT |
615 | done: |
616 | scsi_host_put(shost); | |
617 | return err; | |
618 | } | |
619 | ||
620 | static int __init scsi_tgt_init(void) | |
621 | { | |
622 | int err; | |
623 | ||
b312bab3 | 624 | scsi_tgt_cmd_cache = KMEM_CACHE(scsi_tgt_cmd, 0); |
5a55c259 FT |
625 | if (!scsi_tgt_cmd_cache) |
626 | return -ENOMEM; | |
627 | ||
628 | scsi_tgtd = create_workqueue("scsi_tgtd"); | |
629 | if (!scsi_tgtd) { | |
630 | err = -ENOMEM; | |
631 | goto free_kmemcache; | |
632 | } | |
633 | ||
634 | err = scsi_tgt_if_init(); | |
635 | if (err) | |
636 | goto destroy_wq; | |
637 | ||
638 | return 0; | |
639 | ||
640 | destroy_wq: | |
641 | destroy_workqueue(scsi_tgtd); | |
642 | free_kmemcache: | |
643 | kmem_cache_destroy(scsi_tgt_cmd_cache); | |
644 | return err; | |
645 | } | |
646 | ||
647 | static void __exit scsi_tgt_exit(void) | |
648 | { | |
649 | destroy_workqueue(scsi_tgtd); | |
650 | scsi_tgt_if_exit(); | |
651 | kmem_cache_destroy(scsi_tgt_cmd_cache); | |
652 | } | |
653 | ||
654 | module_init(scsi_tgt_init); | |
655 | module_exit(scsi_tgt_exit); | |
656 | ||
657 | MODULE_DESCRIPTION("SCSI target core"); | |
658 | MODULE_LICENSE("GPL"); |