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> | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
5a55c259 FT |
27 | #include <scsi/scsi.h> |
28 | #include <scsi/scsi_cmnd.h> | |
29 | #include <scsi/scsi_device.h> | |
30 | #include <scsi/scsi_host.h> | |
2c47f9ef | 31 | #include <scsi/scsi_transport.h> |
5a55c259 | 32 | #include <scsi/scsi_tgt.h> |
5a55c259 FT |
33 | |
34 | #include "scsi_tgt_priv.h" | |
35 | ||
36 | static struct workqueue_struct *scsi_tgtd; | |
e18b890b | 37 | static struct kmem_cache *scsi_tgt_cmd_cache; |
5a55c259 FT |
38 | |
39 | /* | |
40 | * TODO: this struct will be killed when the block layer supports large bios | |
41 | * and James's work struct code is in | |
42 | */ | |
43 | struct scsi_tgt_cmd { | |
44 | /* TODO replace work with James b's code */ | |
45 | struct work_struct work; | |
181011e0 MC |
46 | /* TODO fix limits of some drivers */ |
47 | struct bio *bio; | |
5a55c259 FT |
48 | |
49 | struct list_head hash_list; | |
50 | struct request *rq; | |
2c47f9ef | 51 | u64 itn_id; |
5a55c259 | 52 | u64 tag; |
5a55c259 FT |
53 | }; |
54 | ||
55 | #define TGT_HASH_ORDER 4 | |
56 | #define cmd_hashfn(tag) hash_long((unsigned long) (tag), TGT_HASH_ORDER) | |
57 | ||
58 | struct scsi_tgt_queuedata { | |
59 | struct Scsi_Host *shost; | |
60 | struct list_head cmd_hash[1 << TGT_HASH_ORDER]; | |
61 | spinlock_t cmd_hash_lock; | |
62 | }; | |
63 | ||
64 | /* | |
65 | * Function: scsi_host_get_command() | |
66 | * | |
67 | * Purpose: Allocate and setup a scsi command block and blk request | |
68 | * | |
69 | * Arguments: shost - scsi host | |
70 | * data_dir - dma data dir | |
71 | * gfp_mask- allocator flags | |
72 | * | |
73 | * Returns: The allocated scsi command structure. | |
74 | * | |
75 | * This should be called by target LLDs to get a command. | |
76 | */ | |
77 | struct scsi_cmnd *scsi_host_get_command(struct Scsi_Host *shost, | |
78 | enum dma_data_direction data_dir, | |
79 | gfp_t gfp_mask) | |
80 | { | |
81 | int write = (data_dir == DMA_TO_DEVICE); | |
82 | struct request *rq; | |
83 | struct scsi_cmnd *cmd; | |
84 | struct scsi_tgt_cmd *tcmd; | |
85 | ||
86 | /* Bail if we can't get a reference to the device */ | |
87 | if (!get_device(&shost->shost_gendev)) | |
88 | return NULL; | |
89 | ||
90 | tcmd = kmem_cache_alloc(scsi_tgt_cmd_cache, GFP_ATOMIC); | |
91 | if (!tcmd) | |
92 | goto put_dev; | |
93 | ||
181011e0 MC |
94 | /* |
95 | * The blk helpers are used to the READ/WRITE requests | |
96 | * transfering data from a initiator point of view. Since | |
97 | * we are in target mode we want the opposite. | |
98 | */ | |
99 | rq = blk_get_request(shost->uspace_req_q, !write, gfp_mask); | |
5a55c259 FT |
100 | if (!rq) |
101 | goto free_tcmd; | |
102 | ||
103 | cmd = __scsi_get_command(shost, gfp_mask); | |
104 | if (!cmd) | |
105 | goto release_rq; | |
106 | ||
5a55c259 FT |
107 | cmd->sc_data_direction = data_dir; |
108 | cmd->jiffies_at_alloc = jiffies; | |
109 | cmd->request = rq; | |
110 | ||
64a87b24 BH |
111 | cmd->cmnd = rq->cmd; |
112 | ||
5a55c259 FT |
113 | rq->special = cmd; |
114 | rq->cmd_type = REQ_TYPE_SPECIAL; | |
115 | rq->cmd_flags |= REQ_TYPE_BLOCK_PC; | |
116 | rq->end_io_data = tcmd; | |
117 | ||
5a55c259 FT |
118 | tcmd->rq = rq; |
119 | ||
120 | return cmd; | |
121 | ||
122 | release_rq: | |
123 | blk_put_request(rq); | |
124 | free_tcmd: | |
125 | kmem_cache_free(scsi_tgt_cmd_cache, tcmd); | |
126 | put_dev: | |
127 | put_device(&shost->shost_gendev); | |
128 | return NULL; | |
129 | ||
130 | } | |
131 | EXPORT_SYMBOL_GPL(scsi_host_get_command); | |
132 | ||
133 | /* | |
134 | * Function: scsi_host_put_command() | |
135 | * | |
136 | * Purpose: Free a scsi command block | |
137 | * | |
138 | * Arguments: shost - scsi host | |
139 | * cmd - command block to free | |
140 | * | |
141 | * Returns: Nothing. | |
142 | * | |
143 | * Notes: The command must not belong to any lists. | |
144 | */ | |
145 | void scsi_host_put_command(struct Scsi_Host *shost, struct scsi_cmnd *cmd) | |
146 | { | |
147 | struct request_queue *q = shost->uspace_req_q; | |
148 | struct request *rq = cmd->request; | |
149 | struct scsi_tgt_cmd *tcmd = rq->end_io_data; | |
150 | unsigned long flags; | |
151 | ||
152 | kmem_cache_free(scsi_tgt_cmd_cache, tcmd); | |
153 | ||
154 | spin_lock_irqsave(q->queue_lock, flags); | |
155 | __blk_put_request(q, rq); | |
156 | spin_unlock_irqrestore(q->queue_lock, flags); | |
157 | ||
158 | __scsi_put_command(shost, cmd, &shost->shost_gendev); | |
159 | } | |
160 | EXPORT_SYMBOL_GPL(scsi_host_put_command); | |
161 | ||
5a55c259 FT |
162 | static void cmd_hashlist_del(struct scsi_cmnd *cmd) |
163 | { | |
164 | struct request_queue *q = cmd->request->q; | |
165 | struct scsi_tgt_queuedata *qdata = q->queuedata; | |
166 | unsigned long flags; | |
167 | struct scsi_tgt_cmd *tcmd = cmd->request->end_io_data; | |
168 | ||
169 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); | |
170 | list_del(&tcmd->hash_list); | |
171 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
172 | } | |
173 | ||
181011e0 MC |
174 | static void scsi_unmap_user_pages(struct scsi_tgt_cmd *tcmd) |
175 | { | |
176 | blk_rq_unmap_user(tcmd->bio); | |
177 | } | |
178 | ||
06328b4f | 179 | static void scsi_tgt_cmd_destroy(struct work_struct *work) |
5a55c259 | 180 | { |
06328b4f DH |
181 | struct scsi_tgt_cmd *tcmd = |
182 | container_of(work, struct scsi_tgt_cmd, work); | |
183 | struct scsi_cmnd *cmd = tcmd->rq->special; | |
5a55c259 | 184 | |
a8aae4d3 | 185 | dprintk("cmd %p %d %u\n", cmd, cmd->sc_data_direction, |
5a55c259 | 186 | rq_data_dir(cmd->request)); |
5a55c259 | 187 | scsi_unmap_user_pages(tcmd); |
3deee420 | 188 | tcmd->rq->bio = NULL; |
5a55c259 FT |
189 | scsi_host_put_command(scsi_tgt_cmd_to_host(cmd), cmd); |
190 | } | |
191 | ||
192 | static void init_scsi_tgt_cmd(struct request *rq, struct scsi_tgt_cmd *tcmd, | |
2c47f9ef | 193 | u64 itn_id, u64 tag) |
5a55c259 FT |
194 | { |
195 | struct scsi_tgt_queuedata *qdata = rq->q->queuedata; | |
196 | unsigned long flags; | |
197 | struct list_head *head; | |
198 | ||
2c47f9ef | 199 | tcmd->itn_id = itn_id; |
5a55c259 | 200 | tcmd->tag = tag; |
181011e0 | 201 | tcmd->bio = NULL; |
06328b4f | 202 | INIT_WORK(&tcmd->work, scsi_tgt_cmd_destroy); |
5a55c259 FT |
203 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); |
204 | head = &qdata->cmd_hash[cmd_hashfn(tag)]; | |
205 | list_add(&tcmd->hash_list, head); | |
206 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
207 | } | |
208 | ||
209 | /* | |
210 | * scsi_tgt_alloc_queue - setup queue used for message passing | |
211 | * shost: scsi host | |
212 | * | |
213 | * This should be called by the LLD after host allocation. | |
214 | * And will be released when the host is released. | |
215 | */ | |
216 | int scsi_tgt_alloc_queue(struct Scsi_Host *shost) | |
217 | { | |
218 | struct scsi_tgt_queuedata *queuedata; | |
219 | struct request_queue *q; | |
220 | int err, i; | |
221 | ||
222 | /* | |
223 | * Do we need to send a netlink event or should uspace | |
224 | * just respond to the hotplug event? | |
225 | */ | |
226 | q = __scsi_alloc_queue(shost, NULL); | |
227 | if (!q) | |
228 | return -ENOMEM; | |
229 | ||
230 | queuedata = kzalloc(sizeof(*queuedata), GFP_KERNEL); | |
231 | if (!queuedata) { | |
232 | err = -ENOMEM; | |
233 | goto cleanup_queue; | |
234 | } | |
235 | queuedata->shost = shost; | |
236 | q->queuedata = queuedata; | |
237 | ||
238 | /* | |
239 | * this is a silly hack. We should probably just queue as many | |
240 | * command as is recvd to userspace. uspace can then make | |
241 | * sure we do not overload the HBA | |
242 | */ | |
8184fe9b | 243 | q->nr_requests = shost->can_queue; |
5a55c259 FT |
244 | /* |
245 | * We currently only support software LLDs so this does | |
246 | * not matter for now. Do we need this for the cards we support? | |
247 | * If so we should make it a host template value. | |
248 | */ | |
249 | blk_queue_dma_alignment(q, 0); | |
250 | shost->uspace_req_q = q; | |
251 | ||
252 | for (i = 0; i < ARRAY_SIZE(queuedata->cmd_hash); i++) | |
253 | INIT_LIST_HEAD(&queuedata->cmd_hash[i]); | |
254 | spin_lock_init(&queuedata->cmd_hash_lock); | |
255 | ||
256 | return 0; | |
257 | ||
258 | cleanup_queue: | |
259 | blk_cleanup_queue(q); | |
260 | return err; | |
261 | } | |
262 | EXPORT_SYMBOL_GPL(scsi_tgt_alloc_queue); | |
263 | ||
264 | void scsi_tgt_free_queue(struct Scsi_Host *shost) | |
265 | { | |
266 | int i; | |
267 | unsigned long flags; | |
268 | struct request_queue *q = shost->uspace_req_q; | |
269 | struct scsi_cmnd *cmd; | |
270 | struct scsi_tgt_queuedata *qdata = q->queuedata; | |
271 | struct scsi_tgt_cmd *tcmd, *n; | |
272 | LIST_HEAD(cmds); | |
273 | ||
274 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); | |
275 | ||
276 | for (i = 0; i < ARRAY_SIZE(qdata->cmd_hash); i++) { | |
277 | list_for_each_entry_safe(tcmd, n, &qdata->cmd_hash[i], | |
278 | hash_list) { | |
279 | list_del(&tcmd->hash_list); | |
280 | list_add(&tcmd->hash_list, &cmds); | |
281 | } | |
282 | } | |
283 | ||
284 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
285 | ||
286 | while (!list_empty(&cmds)) { | |
287 | tcmd = list_entry(cmds.next, struct scsi_tgt_cmd, hash_list); | |
288 | list_del(&tcmd->hash_list); | |
289 | cmd = tcmd->rq->special; | |
290 | ||
291 | shost->hostt->eh_abort_handler(cmd); | |
06328b4f | 292 | scsi_tgt_cmd_destroy(&tcmd->work); |
5a55c259 FT |
293 | } |
294 | } | |
295 | EXPORT_SYMBOL_GPL(scsi_tgt_free_queue); | |
296 | ||
297 | struct Scsi_Host *scsi_tgt_cmd_to_host(struct scsi_cmnd *cmd) | |
298 | { | |
299 | struct scsi_tgt_queuedata *queue = cmd->request->q->queuedata; | |
300 | return queue->shost; | |
301 | } | |
302 | EXPORT_SYMBOL_GPL(scsi_tgt_cmd_to_host); | |
303 | ||
304 | /* | |
305 | * scsi_tgt_queue_command - queue command for userspace processing | |
306 | * @cmd: scsi command | |
307 | * @scsilun: scsi lun | |
308 | * @tag: unique value to identify this command for tmf | |
309 | */ | |
2c47f9ef FT |
310 | int scsi_tgt_queue_command(struct scsi_cmnd *cmd, u64 itn_id, |
311 | struct scsi_lun *scsilun, u64 tag) | |
5a55c259 FT |
312 | { |
313 | struct scsi_tgt_cmd *tcmd = cmd->request->end_io_data; | |
314 | int err; | |
315 | ||
2c47f9ef FT |
316 | init_scsi_tgt_cmd(cmd->request, tcmd, itn_id, tag); |
317 | err = scsi_tgt_uspace_send_cmd(cmd, itn_id, scsilun, tag); | |
5a55c259 FT |
318 | if (err) |
319 | cmd_hashlist_del(cmd); | |
320 | ||
321 | return err; | |
322 | } | |
323 | EXPORT_SYMBOL_GPL(scsi_tgt_queue_command); | |
324 | ||
325 | /* | |
b1c11812 | 326 | * This is run from a interrupt handler normally and the unmap |
5a55c259 FT |
327 | * needs process context so we must queue |
328 | */ | |
329 | static void scsi_tgt_cmd_done(struct scsi_cmnd *cmd) | |
330 | { | |
331 | struct scsi_tgt_cmd *tcmd = cmd->request->end_io_data; | |
332 | ||
a8aae4d3 | 333 | dprintk("cmd %p %u\n", cmd, rq_data_dir(cmd->request)); |
5a55c259 | 334 | |
2c47f9ef | 335 | scsi_tgt_uspace_send_status(cmd, tcmd->itn_id, tcmd->tag); |
bc7e380a | 336 | |
bb52d82f | 337 | scsi_release_buffers(cmd); |
bc7e380a | 338 | |
5a55c259 FT |
339 | queue_work(scsi_tgtd, &tcmd->work); |
340 | } | |
341 | ||
bc7e380a | 342 | static int scsi_tgt_transfer_response(struct scsi_cmnd *cmd) |
5a55c259 FT |
343 | { |
344 | struct Scsi_Host *shost = scsi_tgt_cmd_to_host(cmd); | |
345 | int err; | |
346 | ||
a8aae4d3 | 347 | dprintk("cmd %p %u\n", cmd, rq_data_dir(cmd->request)); |
5a55c259 FT |
348 | |
349 | err = shost->hostt->transfer_response(cmd, scsi_tgt_cmd_done); | |
350 | switch (err) { | |
351 | case SCSI_MLQUEUE_HOST_BUSY: | |
352 | case SCSI_MLQUEUE_DEVICE_BUSY: | |
353 | return -EAGAIN; | |
354 | } | |
5a55c259 FT |
355 | return 0; |
356 | } | |
357 | ||
5a55c259 FT |
358 | /* TODO: test this crap and replace bio_map_user with new interface maybe */ |
359 | static int scsi_map_user_pages(struct scsi_tgt_cmd *tcmd, struct scsi_cmnd *cmd, | |
bc7e380a | 360 | unsigned long uaddr, unsigned int len, int rw) |
5a55c259 FT |
361 | { |
362 | struct request_queue *q = cmd->request->q; | |
363 | struct request *rq = cmd->request; | |
5a55c259 FT |
364 | int err; |
365 | ||
bc7e380a | 366 | dprintk("%lx %u\n", uaddr, len); |
152e283f | 367 | err = blk_rq_map_user(q, rq, NULL, (void *)uaddr, len, GFP_KERNEL); |
181011e0 | 368 | if (err) { |
5a55c259 | 369 | /* |
181011e0 MC |
370 | * TODO: need to fixup sg_tablesize, max_segment_size, |
371 | * max_sectors, etc for modern HW and software drivers | |
372 | * where this value is bogus. | |
373 | * | |
374 | * TODO2: we can alloc a reserve buffer of max size | |
375 | * we can handle and do the slow copy path for really large | |
376 | * IO. | |
5a55c259 | 377 | */ |
181011e0 MC |
378 | eprintk("Could not handle request of size %u.\n", len); |
379 | return err; | |
5a55c259 FT |
380 | } |
381 | ||
181011e0 | 382 | tcmd->bio = rq->bio; |
bb52d82f BH |
383 | err = scsi_init_io(cmd, GFP_KERNEL); |
384 | if (err) { | |
385 | scsi_release_buffers(cmd); | |
181011e0 | 386 | goto unmap_rq; |
bb52d82f | 387 | } |
cccddc2d FT |
388 | /* |
389 | * we use REQ_TYPE_BLOCK_PC so scsi_init_io doesn't set the | |
390 | * length for us. | |
391 | */ | |
b0790410 | 392 | cmd->sdb.length = blk_rq_bytes(rq); |
5a55c259 FT |
393 | |
394 | return 0; | |
395 | ||
181011e0 MC |
396 | unmap_rq: |
397 | scsi_unmap_user_pages(tcmd); | |
5a55c259 FT |
398 | return err; |
399 | } | |
400 | ||
5a55c259 FT |
401 | static int scsi_tgt_copy_sense(struct scsi_cmnd *cmd, unsigned long uaddr, |
402 | unsigned len) | |
403 | { | |
404 | char __user *p = (char __user *) uaddr; | |
405 | ||
406 | if (copy_from_user(cmd->sense_buffer, p, | |
407 | min_t(unsigned, SCSI_SENSE_BUFFERSIZE, len))) { | |
408 | printk(KERN_ERR "Could not copy the sense buffer\n"); | |
409 | return -EIO; | |
410 | } | |
411 | return 0; | |
412 | } | |
413 | ||
414 | static int scsi_tgt_abort_cmd(struct Scsi_Host *shost, struct scsi_cmnd *cmd) | |
415 | { | |
06328b4f | 416 | struct scsi_tgt_cmd *tcmd; |
5a55c259 FT |
417 | int err; |
418 | ||
419 | err = shost->hostt->eh_abort_handler(cmd); | |
420 | if (err) | |
421 | eprintk("fail to abort %p\n", cmd); | |
422 | ||
06328b4f DH |
423 | tcmd = cmd->request->end_io_data; |
424 | scsi_tgt_cmd_destroy(&tcmd->work); | |
5a55c259 FT |
425 | return err; |
426 | } | |
427 | ||
428 | static struct request *tgt_cmd_hash_lookup(struct request_queue *q, u64 tag) | |
429 | { | |
430 | struct scsi_tgt_queuedata *qdata = q->queuedata; | |
431 | struct request *rq = NULL; | |
432 | struct list_head *head; | |
433 | struct scsi_tgt_cmd *tcmd; | |
434 | unsigned long flags; | |
435 | ||
436 | head = &qdata->cmd_hash[cmd_hashfn(tag)]; | |
437 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); | |
438 | list_for_each_entry(tcmd, head, hash_list) { | |
439 | if (tcmd->tag == tag) { | |
440 | rq = tcmd->rq; | |
441 | list_del(&tcmd->hash_list); | |
442 | break; | |
443 | } | |
444 | } | |
445 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
446 | ||
447 | return rq; | |
448 | } | |
449 | ||
2c47f9ef | 450 | int scsi_tgt_kspace_exec(int host_no, u64 itn_id, int result, u64 tag, |
bc7e380a FT |
451 | unsigned long uaddr, u32 len, unsigned long sense_uaddr, |
452 | u32 sense_len, u8 rw) | |
5a55c259 FT |
453 | { |
454 | struct Scsi_Host *shost; | |
455 | struct scsi_cmnd *cmd; | |
456 | struct request *rq; | |
457 | struct scsi_tgt_cmd *tcmd; | |
458 | int err = 0; | |
459 | ||
460 | dprintk("%d %llu %d %u %lx %u\n", host_no, (unsigned long long) tag, | |
461 | result, len, uaddr, rw); | |
462 | ||
463 | /* TODO: replace with a O(1) alg */ | |
464 | shost = scsi_host_lookup(host_no); | |
315cb0ad | 465 | if (!shost) { |
5a55c259 FT |
466 | printk(KERN_ERR "Could not find host no %d\n", host_no); |
467 | return -EINVAL; | |
468 | } | |
469 | ||
470 | if (!shost->uspace_req_q) { | |
471 | printk(KERN_ERR "Not target scsi host %d\n", host_no); | |
472 | goto done; | |
473 | } | |
474 | ||
475 | rq = tgt_cmd_hash_lookup(shost->uspace_req_q, tag); | |
476 | if (!rq) { | |
477 | printk(KERN_ERR "Could not find tag %llu\n", | |
478 | (unsigned long long) tag); | |
479 | err = -EINVAL; | |
480 | goto done; | |
481 | } | |
482 | cmd = rq->special; | |
483 | ||
a8aae4d3 RD |
484 | dprintk("cmd %p scb %x result %d len %d bufflen %u %u %x\n", |
485 | cmd, cmd->cmnd[0], result, len, scsi_bufflen(cmd), | |
181011e0 | 486 | rq_data_dir(rq), cmd->cmnd[0]); |
5a55c259 FT |
487 | |
488 | if (result == TASK_ABORTED) { | |
489 | scsi_tgt_abort_cmd(shost, cmd); | |
490 | goto done; | |
491 | } | |
492 | /* | |
493 | * store the userspace values here, the working values are | |
494 | * in the request_* values | |
495 | */ | |
496 | tcmd = cmd->request->end_io_data; | |
5a55c259 FT |
497 | cmd->result = result; |
498 | ||
bc7e380a FT |
499 | if (cmd->result == SAM_STAT_CHECK_CONDITION) |
500 | scsi_tgt_copy_sense(cmd, sense_uaddr, sense_len); | |
5a55c259 | 501 | |
bc7e380a FT |
502 | if (len) { |
503 | err = scsi_map_user_pages(rq->end_io_data, cmd, uaddr, len, rw); | |
504 | if (err) { | |
e8f8248c FT |
505 | /* |
506 | * user-space daemon bugs or OOM | |
507 | * TODO: we can do better for OOM. | |
508 | */ | |
a52decaf FT |
509 | struct scsi_tgt_queuedata *qdata; |
510 | struct list_head *head; | |
511 | unsigned long flags; | |
512 | ||
e8f8248c FT |
513 | eprintk("cmd %p ret %d uaddr %lx len %d rw %d\n", |
514 | cmd, err, uaddr, len, rw); | |
a52decaf FT |
515 | |
516 | qdata = shost->uspace_req_q->queuedata; | |
517 | head = &qdata->cmd_hash[cmd_hashfn(tcmd->tag)]; | |
518 | ||
519 | spin_lock_irqsave(&qdata->cmd_hash_lock, flags); | |
520 | list_add(&tcmd->hash_list, head); | |
521 | spin_unlock_irqrestore(&qdata->cmd_hash_lock, flags); | |
522 | ||
523 | goto done; | |
bc7e380a | 524 | } |
5a55c259 | 525 | } |
bc7e380a | 526 | err = scsi_tgt_transfer_response(cmd); |
5a55c259 FT |
527 | done: |
528 | scsi_host_put(shost); | |
529 | return err; | |
530 | } | |
531 | ||
2c47f9ef FT |
532 | int scsi_tgt_tsk_mgmt_request(struct Scsi_Host *shost, u64 itn_id, |
533 | int function, u64 tag, struct scsi_lun *scsilun, | |
534 | void *data) | |
5a55c259 FT |
535 | { |
536 | int err; | |
537 | ||
538 | /* TODO: need to retry if this fails. */ | |
2c47f9ef FT |
539 | err = scsi_tgt_uspace_send_tsk_mgmt(shost->host_no, itn_id, |
540 | function, tag, scsilun, data); | |
5a55c259 FT |
541 | if (err < 0) |
542 | eprintk("The task management request lost!\n"); | |
543 | return err; | |
544 | } | |
545 | EXPORT_SYMBOL_GPL(scsi_tgt_tsk_mgmt_request); | |
546 | ||
2c47f9ef | 547 | int scsi_tgt_kspace_tsk_mgmt(int host_no, u64 itn_id, u64 mid, int result) |
5a55c259 FT |
548 | { |
549 | struct Scsi_Host *shost; | |
550 | int err = -EINVAL; | |
551 | ||
552 | dprintk("%d %d %llx\n", host_no, result, (unsigned long long) mid); | |
553 | ||
554 | shost = scsi_host_lookup(host_no); | |
315cb0ad | 555 | if (!shost) { |
5a55c259 FT |
556 | printk(KERN_ERR "Could not find host no %d\n", host_no); |
557 | return err; | |
558 | } | |
559 | ||
560 | if (!shost->uspace_req_q) { | |
561 | printk(KERN_ERR "Not target scsi host %d\n", host_no); | |
562 | goto done; | |
563 | } | |
564 | ||
bfb74374 | 565 | err = shost->transportt->tsk_mgmt_response(shost, itn_id, mid, result); |
2c47f9ef FT |
566 | done: |
567 | scsi_host_put(shost); | |
568 | return err; | |
569 | } | |
570 | ||
571 | int scsi_tgt_it_nexus_create(struct Scsi_Host *shost, u64 itn_id, | |
572 | char *initiator) | |
573 | { | |
574 | int err; | |
575 | ||
576 | /* TODO: need to retry if this fails. */ | |
577 | err = scsi_tgt_uspace_send_it_nexus_request(shost->host_no, itn_id, 0, | |
578 | initiator); | |
579 | if (err < 0) | |
580 | eprintk("The i_t_neuxs request lost, %d %llx!\n", | |
581 | shost->host_no, (unsigned long long)itn_id); | |
582 | return err; | |
583 | } | |
584 | EXPORT_SYMBOL_GPL(scsi_tgt_it_nexus_create); | |
585 | ||
586 | int scsi_tgt_it_nexus_destroy(struct Scsi_Host *shost, u64 itn_id) | |
587 | { | |
588 | int err; | |
589 | ||
590 | /* TODO: need to retry if this fails. */ | |
591 | err = scsi_tgt_uspace_send_it_nexus_request(shost->host_no, | |
592 | itn_id, 1, NULL); | |
593 | if (err < 0) | |
594 | eprintk("The i_t_neuxs request lost, %d %llx!\n", | |
595 | shost->host_no, (unsigned long long)itn_id); | |
596 | return err; | |
597 | } | |
598 | EXPORT_SYMBOL_GPL(scsi_tgt_it_nexus_destroy); | |
599 | ||
600 | int scsi_tgt_kspace_it_nexus_rsp(int host_no, u64 itn_id, int result) | |
601 | { | |
602 | struct Scsi_Host *shost; | |
603 | int err = -EINVAL; | |
604 | ||
a8aae4d3 | 605 | dprintk("%d %d%llx\n", host_no, result, (unsigned long long)itn_id); |
2c47f9ef FT |
606 | |
607 | shost = scsi_host_lookup(host_no); | |
315cb0ad | 608 | if (!shost) { |
2c47f9ef FT |
609 | printk(KERN_ERR "Could not find host no %d\n", host_no); |
610 | return err; | |
611 | } | |
612 | ||
613 | if (!shost->uspace_req_q) { | |
614 | printk(KERN_ERR "Not target scsi host %d\n", host_no); | |
615 | goto done; | |
616 | } | |
617 | ||
618 | err = shost->transportt->it_nexus_response(shost, itn_id, result); | |
5a55c259 FT |
619 | done: |
620 | scsi_host_put(shost); | |
621 | return err; | |
622 | } | |
623 | ||
624 | static int __init scsi_tgt_init(void) | |
625 | { | |
626 | int err; | |
627 | ||
b312bab3 | 628 | scsi_tgt_cmd_cache = KMEM_CACHE(scsi_tgt_cmd, 0); |
5a55c259 FT |
629 | if (!scsi_tgt_cmd_cache) |
630 | return -ENOMEM; | |
631 | ||
40f38ffb | 632 | scsi_tgtd = alloc_workqueue("scsi_tgtd", 0, 1); |
5a55c259 FT |
633 | if (!scsi_tgtd) { |
634 | err = -ENOMEM; | |
635 | goto free_kmemcache; | |
636 | } | |
637 | ||
638 | err = scsi_tgt_if_init(); | |
639 | if (err) | |
640 | goto destroy_wq; | |
641 | ||
642 | return 0; | |
643 | ||
644 | destroy_wq: | |
645 | destroy_workqueue(scsi_tgtd); | |
646 | free_kmemcache: | |
647 | kmem_cache_destroy(scsi_tgt_cmd_cache); | |
648 | return err; | |
649 | } | |
650 | ||
651 | static void __exit scsi_tgt_exit(void) | |
652 | { | |
653 | destroy_workqueue(scsi_tgtd); | |
654 | scsi_tgt_if_exit(); | |
655 | kmem_cache_destroy(scsi_tgt_cmd_cache); | |
656 | } | |
657 | ||
658 | module_init(scsi_tgt_init); | |
659 | module_exit(scsi_tgt_exit); | |
660 | ||
661 | MODULE_DESCRIPTION("SCSI target core"); | |
662 | MODULE_LICENSE("GPL"); |