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d9d660f6 JG |
1 | /* |
2 | * Xen SCSI backend driver | |
3 | * | |
4 | * Copyright (c) 2008, FUJITSU Limited | |
5 | * | |
6 | * Based on the blkback driver code. | |
7 | * Adaption to kernel taget core infrastructure taken from vhost/scsi.c | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License version 2 | |
11 | * as published by the Free Software Foundation; or, when distributed | |
12 | * separately from the Linux kernel or incorporated into other | |
13 | * software packages, subject to the following license: | |
14 | * | |
15 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
16 | * of this source file (the "Software"), to deal in the Software without | |
17 | * restriction, including without limitation the rights to use, copy, modify, | |
18 | * merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
19 | * and to permit persons to whom the Software is furnished to do so, subject to | |
20 | * the following conditions: | |
21 | * | |
22 | * The above copyright notice and this permission notice shall be included in | |
23 | * all copies or substantial portions of the Software. | |
24 | * | |
25 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
26 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
27 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
28 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
29 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING | |
30 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS | |
31 | * IN THE SOFTWARE. | |
32 | */ | |
33 | ||
78574878 TC |
34 | #define pr_fmt(fmt) "xen-pvscsi: " fmt |
35 | ||
d9d660f6 JG |
36 | #include <stdarg.h> |
37 | ||
38 | #include <linux/module.h> | |
39 | #include <linux/utsname.h> | |
40 | #include <linux/interrupt.h> | |
41 | #include <linux/slab.h> | |
42 | #include <linux/wait.h> | |
43 | #include <linux/sched.h> | |
44 | #include <linux/list.h> | |
45 | #include <linux/gfp.h> | |
46 | #include <linux/delay.h> | |
47 | #include <linux/spinlock.h> | |
48 | #include <linux/configfs.h> | |
49 | ||
50 | #include <generated/utsrelease.h> | |
51 | ||
2dd951ec | 52 | #include <scsi/scsi.h> |
d9d660f6 JG |
53 | #include <scsi/scsi_dbg.h> |
54 | #include <scsi/scsi_eh.h> | |
55 | #include <scsi/scsi_tcq.h> | |
56 | ||
57 | #include <target/target_core_base.h> | |
58 | #include <target/target_core_fabric.h> | |
59 | #include <target/target_core_configfs.h> | |
60 | #include <target/target_core_fabric_configfs.h> | |
61 | ||
62 | #include <asm/hypervisor.h> | |
63 | ||
64 | #include <xen/xen.h> | |
65 | #include <xen/balloon.h> | |
66 | #include <xen/events.h> | |
67 | #include <xen/xenbus.h> | |
68 | #include <xen/grant_table.h> | |
69 | #include <xen/page.h> | |
70 | ||
71 | #include <xen/interface/grant_table.h> | |
72 | #include <xen/interface/io/vscsiif.h> | |
73 | ||
d9d660f6 JG |
74 | #define VSCSI_VERSION "v0.1" |
75 | #define VSCSI_NAMELEN 32 | |
76 | ||
77 | struct ids_tuple { | |
78 | unsigned int hst; /* host */ | |
79 | unsigned int chn; /* channel */ | |
80 | unsigned int tgt; /* target */ | |
81 | unsigned int lun; /* LUN */ | |
82 | }; | |
83 | ||
84 | struct v2p_entry { | |
85 | struct ids_tuple v; /* translate from */ | |
86 | struct scsiback_tpg *tpg; /* translate to */ | |
87 | unsigned int lun; | |
88 | struct kref kref; | |
89 | struct list_head l; | |
90 | }; | |
91 | ||
92 | struct vscsibk_info { | |
93 | struct xenbus_device *dev; | |
94 | ||
95 | domid_t domid; | |
96 | unsigned int irq; | |
97 | ||
98 | struct vscsiif_back_ring ring; | |
99 | int ring_error; | |
100 | ||
101 | spinlock_t ring_lock; | |
102 | atomic_t nr_unreplied_reqs; | |
103 | ||
104 | spinlock_t v2p_lock; | |
105 | struct list_head v2p_entry_lists; | |
106 | ||
107 | wait_queue_head_t waiting_to_free; | |
108 | }; | |
109 | ||
110 | /* theoretical maximum of grants for one request */ | |
111 | #define VSCSI_MAX_GRANTS (SG_ALL + VSCSIIF_SG_TABLESIZE) | |
112 | ||
113 | /* | |
114 | * VSCSI_GRANT_BATCH is the maximum number of grants to be processed in one | |
115 | * call to map/unmap grants. Don't choose it too large, as there are arrays | |
116 | * with VSCSI_GRANT_BATCH elements allocated on the stack. | |
117 | */ | |
118 | #define VSCSI_GRANT_BATCH 16 | |
119 | ||
120 | struct vscsibk_pend { | |
121 | uint16_t rqid; | |
122 | ||
123 | uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE]; | |
124 | uint8_t cmd_len; | |
125 | ||
126 | uint8_t sc_data_direction; | |
127 | uint16_t n_sg; /* real length of SG list */ | |
128 | uint16_t n_grants; /* SG pages and potentially SG list */ | |
129 | uint32_t data_len; | |
130 | uint32_t result; | |
131 | ||
132 | struct vscsibk_info *info; | |
133 | struct v2p_entry *v2p; | |
134 | struct scatterlist *sgl; | |
135 | ||
136 | uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE]; | |
137 | ||
138 | grant_handle_t grant_handles[VSCSI_MAX_GRANTS]; | |
139 | struct page *pages[VSCSI_MAX_GRANTS]; | |
140 | ||
141 | struct se_cmd se_cmd; | |
142 | }; | |
143 | ||
144 | struct scsiback_tmr { | |
145 | atomic_t tmr_complete; | |
146 | wait_queue_head_t tmr_wait; | |
147 | }; | |
148 | ||
149 | struct scsiback_nexus { | |
150 | /* Pointer to TCM session for I_T Nexus */ | |
151 | struct se_session *tvn_se_sess; | |
152 | }; | |
153 | ||
154 | struct scsiback_tport { | |
155 | /* SCSI protocol the tport is providing */ | |
156 | u8 tport_proto_id; | |
157 | /* Binary World Wide unique Port Name for pvscsi Target port */ | |
158 | u64 tport_wwpn; | |
159 | /* ASCII formatted WWPN for pvscsi Target port */ | |
160 | char tport_name[VSCSI_NAMELEN]; | |
161 | /* Returned by scsiback_make_tport() */ | |
162 | struct se_wwn tport_wwn; | |
163 | }; | |
164 | ||
165 | struct scsiback_tpg { | |
166 | /* scsiback port target portal group tag for TCM */ | |
167 | u16 tport_tpgt; | |
168 | /* track number of TPG Port/Lun Links wrt explicit I_T Nexus shutdown */ | |
169 | int tv_tpg_port_count; | |
170 | /* xen-pvscsi references to tpg_nexus, protected by tv_tpg_mutex */ | |
171 | int tv_tpg_fe_count; | |
172 | /* list for scsiback_list */ | |
173 | struct list_head tv_tpg_list; | |
174 | /* Used to protect access for tpg_nexus */ | |
175 | struct mutex tv_tpg_mutex; | |
176 | /* Pointer to the TCM pvscsi I_T Nexus for this TPG endpoint */ | |
177 | struct scsiback_nexus *tpg_nexus; | |
178 | /* Pointer back to scsiback_tport */ | |
179 | struct scsiback_tport *tport; | |
180 | /* Returned by scsiback_make_tpg() */ | |
181 | struct se_portal_group se_tpg; | |
182 | /* alias used in xenstore */ | |
183 | char param_alias[VSCSI_NAMELEN]; | |
184 | /* list of info structures related to this target portal group */ | |
185 | struct list_head info_list; | |
186 | }; | |
187 | ||
188 | #define SCSIBACK_INVALID_HANDLE (~0) | |
189 | ||
190 | static bool log_print_stat; | |
191 | module_param(log_print_stat, bool, 0644); | |
192 | ||
193 | static int scsiback_max_buffer_pages = 1024; | |
194 | module_param_named(max_buffer_pages, scsiback_max_buffer_pages, int, 0644); | |
195 | MODULE_PARM_DESC(max_buffer_pages, | |
196 | "Maximum number of free pages to keep in backend buffer"); | |
197 | ||
198 | static struct kmem_cache *scsiback_cachep; | |
199 | static DEFINE_SPINLOCK(free_pages_lock); | |
200 | static int free_pages_num; | |
201 | static LIST_HEAD(scsiback_free_pages); | |
202 | ||
203 | /* Global spinlock to protect scsiback TPG list */ | |
204 | static DEFINE_MUTEX(scsiback_mutex); | |
205 | static LIST_HEAD(scsiback_list); | |
206 | ||
207 | /* Local pointer to allocated TCM configfs fabric module */ | |
208 | static struct target_fabric_configfs *scsiback_fabric_configfs; | |
209 | ||
210 | static void scsiback_get(struct vscsibk_info *info) | |
211 | { | |
212 | atomic_inc(&info->nr_unreplied_reqs); | |
213 | } | |
214 | ||
215 | static void scsiback_put(struct vscsibk_info *info) | |
216 | { | |
217 | if (atomic_dec_and_test(&info->nr_unreplied_reqs)) | |
218 | wake_up(&info->waiting_to_free); | |
219 | } | |
220 | ||
221 | static void put_free_pages(struct page **page, int num) | |
222 | { | |
223 | unsigned long flags; | |
224 | int i = free_pages_num + num, n = num; | |
225 | ||
226 | if (num == 0) | |
227 | return; | |
228 | if (i > scsiback_max_buffer_pages) { | |
229 | n = min(num, i - scsiback_max_buffer_pages); | |
ff4b156f | 230 | gnttab_free_pages(n, page + num - n); |
d9d660f6 JG |
231 | n = num - n; |
232 | } | |
233 | spin_lock_irqsave(&free_pages_lock, flags); | |
234 | for (i = 0; i < n; i++) | |
235 | list_add(&page[i]->lru, &scsiback_free_pages); | |
236 | free_pages_num += n; | |
237 | spin_unlock_irqrestore(&free_pages_lock, flags); | |
238 | } | |
239 | ||
240 | static int get_free_page(struct page **page) | |
241 | { | |
242 | unsigned long flags; | |
243 | ||
244 | spin_lock_irqsave(&free_pages_lock, flags); | |
245 | if (list_empty(&scsiback_free_pages)) { | |
246 | spin_unlock_irqrestore(&free_pages_lock, flags); | |
ff4b156f | 247 | return gnttab_alloc_pages(1, page); |
d9d660f6 JG |
248 | } |
249 | page[0] = list_first_entry(&scsiback_free_pages, struct page, lru); | |
250 | list_del(&page[0]->lru); | |
251 | free_pages_num--; | |
252 | spin_unlock_irqrestore(&free_pages_lock, flags); | |
253 | return 0; | |
254 | } | |
255 | ||
256 | static unsigned long vaddr_page(struct page *page) | |
257 | { | |
258 | unsigned long pfn = page_to_pfn(page); | |
259 | ||
260 | return (unsigned long)pfn_to_kaddr(pfn); | |
261 | } | |
262 | ||
263 | static unsigned long vaddr(struct vscsibk_pend *req, int seg) | |
264 | { | |
265 | return vaddr_page(req->pages[seg]); | |
266 | } | |
267 | ||
268 | static void scsiback_print_status(char *sense_buffer, int errors, | |
269 | struct vscsibk_pend *pending_req) | |
270 | { | |
271 | struct scsiback_tpg *tpg = pending_req->v2p->tpg; | |
272 | ||
78574878 | 273 | pr_err("[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n", |
d9d660f6 JG |
274 | tpg->tport->tport_name, pending_req->v2p->lun, |
275 | pending_req->cmnd[0], status_byte(errors), msg_byte(errors), | |
276 | host_byte(errors), driver_byte(errors)); | |
d9d660f6 JG |
277 | } |
278 | ||
279 | static void scsiback_fast_flush_area(struct vscsibk_pend *req) | |
280 | { | |
281 | struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH]; | |
282 | struct page *pages[VSCSI_GRANT_BATCH]; | |
283 | unsigned int i, invcount = 0; | |
284 | grant_handle_t handle; | |
285 | int err; | |
286 | ||
287 | kfree(req->sgl); | |
288 | req->sgl = NULL; | |
289 | req->n_sg = 0; | |
290 | ||
291 | if (!req->n_grants) | |
292 | return; | |
293 | ||
294 | for (i = 0; i < req->n_grants; i++) { | |
295 | handle = req->grant_handles[i]; | |
296 | if (handle == SCSIBACK_INVALID_HANDLE) | |
297 | continue; | |
298 | gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i), | |
299 | GNTMAP_host_map, handle); | |
300 | req->grant_handles[i] = SCSIBACK_INVALID_HANDLE; | |
301 | pages[invcount] = req->pages[i]; | |
302 | put_page(pages[invcount]); | |
303 | invcount++; | |
304 | if (invcount < VSCSI_GRANT_BATCH) | |
305 | continue; | |
306 | err = gnttab_unmap_refs(unmap, NULL, pages, invcount); | |
307 | BUG_ON(err); | |
308 | invcount = 0; | |
309 | } | |
310 | ||
311 | if (invcount) { | |
312 | err = gnttab_unmap_refs(unmap, NULL, pages, invcount); | |
313 | BUG_ON(err); | |
314 | } | |
315 | ||
316 | put_free_pages(req->pages, req->n_grants); | |
317 | req->n_grants = 0; | |
318 | } | |
319 | ||
320 | static void scsiback_free_translation_entry(struct kref *kref) | |
321 | { | |
322 | struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref); | |
323 | struct scsiback_tpg *tpg = entry->tpg; | |
324 | ||
325 | mutex_lock(&tpg->tv_tpg_mutex); | |
326 | tpg->tv_tpg_fe_count--; | |
327 | mutex_unlock(&tpg->tv_tpg_mutex); | |
328 | ||
329 | kfree(entry); | |
330 | } | |
331 | ||
332 | static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result, | |
333 | uint32_t resid, struct vscsibk_pend *pending_req) | |
334 | { | |
335 | struct vscsiif_response *ring_res; | |
336 | struct vscsibk_info *info = pending_req->info; | |
337 | int notify; | |
338 | struct scsi_sense_hdr sshdr; | |
339 | unsigned long flags; | |
340 | unsigned len; | |
341 | ||
342 | spin_lock_irqsave(&info->ring_lock, flags); | |
343 | ||
344 | ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt); | |
345 | info->ring.rsp_prod_pvt++; | |
346 | ||
347 | ring_res->rslt = result; | |
348 | ring_res->rqid = pending_req->rqid; | |
349 | ||
350 | if (sense_buffer != NULL && | |
351 | scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE, | |
352 | &sshdr)) { | |
353 | len = min_t(unsigned, 8 + sense_buffer[7], | |
354 | VSCSIIF_SENSE_BUFFERSIZE); | |
355 | memcpy(ring_res->sense_buffer, sense_buffer, len); | |
356 | ring_res->sense_len = len; | |
357 | } else { | |
358 | ring_res->sense_len = 0; | |
359 | } | |
360 | ||
361 | ring_res->residual_len = resid; | |
362 | ||
363 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify); | |
364 | spin_unlock_irqrestore(&info->ring_lock, flags); | |
365 | ||
366 | if (notify) | |
367 | notify_remote_via_irq(info->irq); | |
368 | ||
369 | if (pending_req->v2p) | |
370 | kref_put(&pending_req->v2p->kref, | |
371 | scsiback_free_translation_entry); | |
372 | } | |
373 | ||
374 | static void scsiback_cmd_done(struct vscsibk_pend *pending_req) | |
375 | { | |
376 | struct vscsibk_info *info = pending_req->info; | |
377 | unsigned char *sense_buffer; | |
378 | unsigned int resid; | |
379 | int errors; | |
380 | ||
381 | sense_buffer = pending_req->sense_buffer; | |
382 | resid = pending_req->se_cmd.residual_count; | |
383 | errors = pending_req->result; | |
384 | ||
385 | if (errors && log_print_stat) | |
386 | scsiback_print_status(sense_buffer, errors, pending_req); | |
387 | ||
388 | scsiback_fast_flush_area(pending_req); | |
389 | scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req); | |
390 | scsiback_put(info); | |
391 | } | |
392 | ||
393 | static void scsiback_cmd_exec(struct vscsibk_pend *pending_req) | |
394 | { | |
395 | struct se_cmd *se_cmd = &pending_req->se_cmd; | |
396 | struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess; | |
397 | int rc; | |
398 | ||
399 | memset(pending_req->sense_buffer, 0, VSCSIIF_SENSE_BUFFERSIZE); | |
400 | ||
401 | memset(se_cmd, 0, sizeof(*se_cmd)); | |
402 | ||
403 | scsiback_get(pending_req->info); | |
404 | rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd, | |
405 | pending_req->sense_buffer, pending_req->v2p->lun, | |
406 | pending_req->data_len, 0, | |
407 | pending_req->sc_data_direction, 0, | |
408 | pending_req->sgl, pending_req->n_sg, | |
409 | NULL, 0, NULL, 0); | |
410 | if (rc < 0) { | |
411 | transport_send_check_condition_and_sense(se_cmd, | |
412 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); | |
413 | transport_generic_free_cmd(se_cmd, 0); | |
414 | } | |
415 | } | |
416 | ||
417 | static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map, | |
418 | struct page **pg, grant_handle_t *grant, int cnt) | |
419 | { | |
420 | int err, i; | |
421 | ||
422 | if (!cnt) | |
423 | return 0; | |
424 | ||
425 | err = gnttab_map_refs(map, NULL, pg, cnt); | |
426 | BUG_ON(err); | |
427 | for (i = 0; i < cnt; i++) { | |
428 | if (unlikely(map[i].status != GNTST_okay)) { | |
78574878 | 429 | pr_err("invalid buffer -- could not remap it\n"); |
d9d660f6 JG |
430 | map[i].handle = SCSIBACK_INVALID_HANDLE; |
431 | err = -ENOMEM; | |
432 | } else { | |
433 | get_page(pg[i]); | |
434 | } | |
435 | grant[i] = map[i].handle; | |
436 | } | |
437 | return err; | |
438 | } | |
439 | ||
440 | static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req, | |
441 | struct scsiif_request_segment *seg, struct page **pg, | |
442 | grant_handle_t *grant, int cnt, u32 flags) | |
443 | { | |
444 | int mapcount = 0, i, err = 0; | |
445 | struct gnttab_map_grant_ref map[VSCSI_GRANT_BATCH]; | |
446 | struct vscsibk_info *info = pending_req->info; | |
447 | ||
448 | for (i = 0; i < cnt; i++) { | |
449 | if (get_free_page(pg + mapcount)) { | |
450 | put_free_pages(pg, mapcount); | |
78574878 | 451 | pr_err("no grant page\n"); |
d9d660f6 JG |
452 | return -ENOMEM; |
453 | } | |
454 | gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]), | |
455 | flags, seg[i].gref, info->domid); | |
456 | mapcount++; | |
457 | if (mapcount < VSCSI_GRANT_BATCH) | |
458 | continue; | |
459 | err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); | |
460 | pg += mapcount; | |
461 | grant += mapcount; | |
462 | pending_req->n_grants += mapcount; | |
463 | if (err) | |
464 | return err; | |
465 | mapcount = 0; | |
466 | } | |
467 | err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); | |
468 | pending_req->n_grants += mapcount; | |
469 | return err; | |
470 | } | |
471 | ||
472 | static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req, | |
473 | struct vscsibk_pend *pending_req) | |
474 | { | |
475 | u32 flags; | |
476 | int i, err, n_segs, i_seg = 0; | |
477 | struct page **pg; | |
478 | struct scsiif_request_segment *seg; | |
479 | unsigned long end_seg = 0; | |
480 | unsigned int nr_segments = (unsigned int)ring_req->nr_segments; | |
481 | unsigned int nr_sgl = 0; | |
482 | struct scatterlist *sg; | |
483 | grant_handle_t *grant; | |
484 | ||
485 | pending_req->n_sg = 0; | |
486 | pending_req->n_grants = 0; | |
487 | pending_req->data_len = 0; | |
488 | ||
489 | nr_segments &= ~VSCSIIF_SG_GRANT; | |
490 | if (!nr_segments) | |
491 | return 0; | |
492 | ||
493 | if (nr_segments > VSCSIIF_SG_TABLESIZE) { | |
78574878 | 494 | pr_debug("invalid parameter nr_seg = %d\n", |
d9d660f6 JG |
495 | ring_req->nr_segments); |
496 | return -EINVAL; | |
497 | } | |
498 | ||
499 | if (ring_req->nr_segments & VSCSIIF_SG_GRANT) { | |
500 | err = scsiback_gnttab_data_map_list(pending_req, ring_req->seg, | |
501 | pending_req->pages, pending_req->grant_handles, | |
502 | nr_segments, GNTMAP_host_map | GNTMAP_readonly); | |
503 | if (err) | |
504 | return err; | |
505 | nr_sgl = nr_segments; | |
506 | nr_segments = 0; | |
507 | for (i = 0; i < nr_sgl; i++) { | |
508 | n_segs = ring_req->seg[i].length / | |
509 | sizeof(struct scsiif_request_segment); | |
510 | if ((unsigned)ring_req->seg[i].offset + | |
511 | (unsigned)ring_req->seg[i].length > PAGE_SIZE || | |
512 | n_segs * sizeof(struct scsiif_request_segment) != | |
513 | ring_req->seg[i].length) | |
514 | return -EINVAL; | |
515 | nr_segments += n_segs; | |
516 | } | |
517 | if (nr_segments > SG_ALL) { | |
78574878 | 518 | pr_debug("invalid nr_seg = %d\n", nr_segments); |
d9d660f6 JG |
519 | return -EINVAL; |
520 | } | |
521 | } | |
522 | ||
78574878 | 523 | /* free of (sgl) in fast_flush_area() */ |
d9d660f6 JG |
524 | pending_req->sgl = kmalloc_array(nr_segments, |
525 | sizeof(struct scatterlist), GFP_KERNEL); | |
526 | if (!pending_req->sgl) | |
527 | return -ENOMEM; | |
528 | ||
529 | sg_init_table(pending_req->sgl, nr_segments); | |
530 | pending_req->n_sg = nr_segments; | |
531 | ||
532 | flags = GNTMAP_host_map; | |
533 | if (pending_req->sc_data_direction == DMA_TO_DEVICE) | |
534 | flags |= GNTMAP_readonly; | |
535 | ||
536 | pg = pending_req->pages + nr_sgl; | |
537 | grant = pending_req->grant_handles + nr_sgl; | |
538 | if (!nr_sgl) { | |
539 | seg = ring_req->seg; | |
540 | err = scsiback_gnttab_data_map_list(pending_req, seg, | |
541 | pg, grant, nr_segments, flags); | |
542 | if (err) | |
543 | return err; | |
544 | } else { | |
545 | for (i = 0; i < nr_sgl; i++) { | |
546 | seg = (struct scsiif_request_segment *)( | |
547 | vaddr(pending_req, i) + ring_req->seg[i].offset); | |
548 | n_segs = ring_req->seg[i].length / | |
549 | sizeof(struct scsiif_request_segment); | |
550 | err = scsiback_gnttab_data_map_list(pending_req, seg, | |
551 | pg, grant, n_segs, flags); | |
552 | if (err) | |
553 | return err; | |
554 | pg += n_segs; | |
555 | grant += n_segs; | |
556 | } | |
557 | end_seg = vaddr(pending_req, 0) + ring_req->seg[0].offset; | |
558 | seg = (struct scsiif_request_segment *)end_seg; | |
559 | end_seg += ring_req->seg[0].length; | |
560 | pg = pending_req->pages + nr_sgl; | |
561 | } | |
562 | ||
563 | for_each_sg(pending_req->sgl, sg, nr_segments, i) { | |
564 | sg_set_page(sg, pg[i], seg->length, seg->offset); | |
565 | pending_req->data_len += seg->length; | |
566 | seg++; | |
567 | if (nr_sgl && (unsigned long)seg >= end_seg) { | |
568 | i_seg++; | |
569 | end_seg = vaddr(pending_req, i_seg) + | |
570 | ring_req->seg[i_seg].offset; | |
571 | seg = (struct scsiif_request_segment *)end_seg; | |
572 | end_seg += ring_req->seg[i_seg].length; | |
573 | } | |
574 | if (sg->offset >= PAGE_SIZE || | |
575 | sg->length > PAGE_SIZE || | |
576 | sg->offset + sg->length > PAGE_SIZE) | |
577 | return -EINVAL; | |
578 | } | |
579 | ||
580 | return 0; | |
581 | } | |
582 | ||
583 | static void scsiback_disconnect(struct vscsibk_info *info) | |
584 | { | |
585 | wait_event(info->waiting_to_free, | |
586 | atomic_read(&info->nr_unreplied_reqs) == 0); | |
587 | ||
588 | unbind_from_irqhandler(info->irq, info); | |
589 | info->irq = 0; | |
590 | xenbus_unmap_ring_vfree(info->dev, info->ring.sring); | |
591 | } | |
592 | ||
593 | static void scsiback_device_action(struct vscsibk_pend *pending_req, | |
594 | enum tcm_tmreq_table act, int tag) | |
595 | { | |
596 | int rc, err = FAILED; | |
597 | struct scsiback_tpg *tpg = pending_req->v2p->tpg; | |
598 | struct se_cmd *se_cmd = &pending_req->se_cmd; | |
599 | struct scsiback_tmr *tmr; | |
600 | ||
601 | tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL); | |
602 | if (!tmr) | |
603 | goto out; | |
604 | ||
605 | init_waitqueue_head(&tmr->tmr_wait); | |
606 | ||
607 | transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo, | |
68d81f40 | 608 | tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, TCM_SIMPLE_TAG, |
d9d660f6 JG |
609 | &pending_req->sense_buffer[0]); |
610 | ||
611 | rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL); | |
612 | if (rc < 0) | |
613 | goto out; | |
614 | ||
615 | se_cmd->se_tmr_req->ref_task_tag = tag; | |
616 | ||
617 | if (transport_lookup_tmr_lun(se_cmd, pending_req->v2p->lun) < 0) | |
618 | goto out; | |
619 | ||
620 | transport_generic_handle_tmr(se_cmd); | |
621 | wait_event(tmr->tmr_wait, atomic_read(&tmr->tmr_complete)); | |
622 | ||
623 | err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? | |
624 | SUCCESS : FAILED; | |
625 | ||
626 | out: | |
627 | if (tmr) { | |
628 | transport_generic_free_cmd(&pending_req->se_cmd, 1); | |
629 | kfree(tmr); | |
630 | } | |
631 | ||
632 | scsiback_do_resp_with_sense(NULL, err, 0, pending_req); | |
633 | ||
634 | kmem_cache_free(scsiback_cachep, pending_req); | |
635 | } | |
636 | ||
637 | /* | |
638 | Perform virtual to physical translation | |
639 | */ | |
640 | static struct v2p_entry *scsiback_do_translation(struct vscsibk_info *info, | |
641 | struct ids_tuple *v) | |
642 | { | |
643 | struct v2p_entry *entry; | |
644 | struct list_head *head = &(info->v2p_entry_lists); | |
645 | unsigned long flags; | |
646 | ||
647 | spin_lock_irqsave(&info->v2p_lock, flags); | |
648 | list_for_each_entry(entry, head, l) { | |
649 | if ((entry->v.chn == v->chn) && | |
650 | (entry->v.tgt == v->tgt) && | |
651 | (entry->v.lun == v->lun)) { | |
652 | kref_get(&entry->kref); | |
653 | goto out; | |
654 | } | |
655 | } | |
656 | entry = NULL; | |
657 | ||
658 | out: | |
659 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
660 | return entry; | |
661 | } | |
662 | ||
663 | static int prepare_pending_reqs(struct vscsibk_info *info, | |
664 | struct vscsiif_request *ring_req, | |
665 | struct vscsibk_pend *pending_req) | |
666 | { | |
667 | struct v2p_entry *v2p; | |
668 | struct ids_tuple vir; | |
669 | ||
670 | pending_req->rqid = ring_req->rqid; | |
671 | pending_req->info = info; | |
672 | ||
673 | vir.chn = ring_req->channel; | |
674 | vir.tgt = ring_req->id; | |
675 | vir.lun = ring_req->lun; | |
676 | ||
677 | v2p = scsiback_do_translation(info, &vir); | |
678 | if (!v2p) { | |
679 | pending_req->v2p = NULL; | |
78574878 TC |
680 | pr_debug("the v2p of (chn:%d, tgt:%d, lun:%d) doesn't exist.\n", |
681 | vir.chn, vir.tgt, vir.lun); | |
d9d660f6 JG |
682 | return -ENODEV; |
683 | } | |
684 | pending_req->v2p = v2p; | |
685 | ||
686 | /* request range check from frontend */ | |
687 | pending_req->sc_data_direction = ring_req->sc_data_direction; | |
688 | if ((pending_req->sc_data_direction != DMA_BIDIRECTIONAL) && | |
689 | (pending_req->sc_data_direction != DMA_TO_DEVICE) && | |
690 | (pending_req->sc_data_direction != DMA_FROM_DEVICE) && | |
691 | (pending_req->sc_data_direction != DMA_NONE)) { | |
78574878 | 692 | pr_debug("invalid parameter data_dir = %d\n", |
d9d660f6 JG |
693 | pending_req->sc_data_direction); |
694 | return -EINVAL; | |
695 | } | |
696 | ||
697 | pending_req->cmd_len = ring_req->cmd_len; | |
698 | if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) { | |
78574878 | 699 | pr_debug("invalid parameter cmd_len = %d\n", |
d9d660f6 JG |
700 | pending_req->cmd_len); |
701 | return -EINVAL; | |
702 | } | |
703 | memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len); | |
704 | ||
705 | return 0; | |
706 | } | |
707 | ||
708 | static int scsiback_do_cmd_fn(struct vscsibk_info *info) | |
709 | { | |
710 | struct vscsiif_back_ring *ring = &info->ring; | |
facb5732 | 711 | struct vscsiif_request ring_req; |
d9d660f6 JG |
712 | struct vscsibk_pend *pending_req; |
713 | RING_IDX rc, rp; | |
714 | int err, more_to_do; | |
715 | uint32_t result; | |
d9d660f6 JG |
716 | |
717 | rc = ring->req_cons; | |
718 | rp = ring->sring->req_prod; | |
719 | rmb(); /* guest system is accessing ring, too */ | |
720 | ||
721 | if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) { | |
722 | rc = ring->rsp_prod_pvt; | |
78574878 | 723 | pr_warn("Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n", |
d9d660f6 JG |
724 | info->domid, rp, rc, rp - rc); |
725 | info->ring_error = 1; | |
726 | return 0; | |
727 | } | |
728 | ||
729 | while ((rc != rp)) { | |
730 | if (RING_REQUEST_CONS_OVERFLOW(ring, rc)) | |
731 | break; | |
732 | pending_req = kmem_cache_alloc(scsiback_cachep, GFP_KERNEL); | |
733 | if (!pending_req) | |
734 | return 1; | |
735 | ||
facb5732 | 736 | ring_req = *RING_GET_REQUEST(ring, rc); |
d9d660f6 JG |
737 | ring->req_cons = ++rc; |
738 | ||
facb5732 | 739 | err = prepare_pending_reqs(info, &ring_req, pending_req); |
d9d660f6 JG |
740 | if (err) { |
741 | switch (err) { | |
742 | case -ENODEV: | |
743 | result = DID_NO_CONNECT; | |
744 | break; | |
745 | default: | |
746 | result = DRIVER_ERROR; | |
747 | break; | |
748 | } | |
749 | scsiback_do_resp_with_sense(NULL, result << 24, 0, | |
750 | pending_req); | |
751 | kmem_cache_free(scsiback_cachep, pending_req); | |
752 | return 1; | |
753 | } | |
754 | ||
facb5732 | 755 | switch (ring_req.act) { |
d9d660f6 | 756 | case VSCSIIF_ACT_SCSI_CDB: |
facb5732 | 757 | if (scsiback_gnttab_data_map(&ring_req, pending_req)) { |
d9d660f6 JG |
758 | scsiback_fast_flush_area(pending_req); |
759 | scsiback_do_resp_with_sense(NULL, | |
760 | DRIVER_ERROR << 24, 0, pending_req); | |
761 | kmem_cache_free(scsiback_cachep, pending_req); | |
762 | } else { | |
763 | scsiback_cmd_exec(pending_req); | |
764 | } | |
765 | break; | |
766 | case VSCSIIF_ACT_SCSI_ABORT: | |
767 | scsiback_device_action(pending_req, TMR_ABORT_TASK, | |
facb5732 | 768 | ring_req.ref_rqid); |
d9d660f6 JG |
769 | break; |
770 | case VSCSIIF_ACT_SCSI_RESET: | |
771 | scsiback_device_action(pending_req, TMR_LUN_RESET, 0); | |
772 | break; | |
773 | default: | |
78574878 | 774 | pr_err_ratelimited("invalid request\n"); |
d9d660f6 JG |
775 | scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24, |
776 | 0, pending_req); | |
777 | kmem_cache_free(scsiback_cachep, pending_req); | |
778 | break; | |
779 | } | |
780 | ||
781 | /* Yield point for this unbounded loop. */ | |
782 | cond_resched(); | |
783 | } | |
784 | ||
785 | RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do); | |
786 | return more_to_do; | |
787 | } | |
788 | ||
789 | static irqreturn_t scsiback_irq_fn(int irq, void *dev_id) | |
790 | { | |
791 | struct vscsibk_info *info = dev_id; | |
792 | ||
793 | if (info->ring_error) | |
794 | return IRQ_HANDLED; | |
795 | ||
796 | while (scsiback_do_cmd_fn(info)) | |
797 | cond_resched(); | |
798 | ||
799 | return IRQ_HANDLED; | |
800 | } | |
801 | ||
802 | static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref, | |
803 | evtchn_port_t evtchn) | |
804 | { | |
805 | void *area; | |
806 | struct vscsiif_sring *sring; | |
807 | int err; | |
808 | ||
809 | if (info->irq) | |
810 | return -1; | |
811 | ||
ccc9d90a | 812 | err = xenbus_map_ring_valloc(info->dev, &ring_ref, 1, &area); |
d9d660f6 JG |
813 | if (err) |
814 | return err; | |
815 | ||
816 | sring = (struct vscsiif_sring *)area; | |
817 | BACK_RING_INIT(&info->ring, sring, PAGE_SIZE); | |
818 | ||
819 | err = bind_interdomain_evtchn_to_irq(info->domid, evtchn); | |
820 | if (err < 0) | |
821 | goto unmap_page; | |
822 | ||
823 | info->irq = err; | |
824 | ||
825 | err = request_threaded_irq(info->irq, NULL, scsiback_irq_fn, | |
826 | IRQF_ONESHOT, "vscsiif-backend", info); | |
827 | if (err) | |
828 | goto free_irq; | |
829 | ||
830 | return 0; | |
831 | ||
832 | free_irq: | |
833 | unbind_from_irqhandler(info->irq, info); | |
834 | info->irq = 0; | |
835 | unmap_page: | |
836 | xenbus_unmap_ring_vfree(info->dev, area); | |
837 | ||
838 | return err; | |
839 | } | |
840 | ||
841 | static int scsiback_map(struct vscsibk_info *info) | |
842 | { | |
843 | struct xenbus_device *dev = info->dev; | |
844 | unsigned int ring_ref, evtchn; | |
845 | int err; | |
846 | ||
847 | err = xenbus_gather(XBT_NIL, dev->otherend, | |
848 | "ring-ref", "%u", &ring_ref, | |
849 | "event-channel", "%u", &evtchn, NULL); | |
850 | if (err) { | |
851 | xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend); | |
852 | return err; | |
853 | } | |
854 | ||
855 | return scsiback_init_sring(info, ring_ref, evtchn); | |
856 | } | |
857 | ||
858 | /* | |
859 | Add a new translation entry | |
860 | */ | |
861 | static int scsiback_add_translation_entry(struct vscsibk_info *info, | |
862 | char *phy, struct ids_tuple *v) | |
863 | { | |
864 | int err = 0; | |
865 | struct v2p_entry *entry; | |
866 | struct v2p_entry *new; | |
867 | struct list_head *head = &(info->v2p_entry_lists); | |
868 | unsigned long flags; | |
869 | char *lunp; | |
870 | unsigned int lun; | |
871 | struct scsiback_tpg *tpg_entry, *tpg = NULL; | |
872 | char *error = "doesn't exist"; | |
873 | ||
874 | lunp = strrchr(phy, ':'); | |
875 | if (!lunp) { | |
78574878 | 876 | pr_err("illegal format of physical device %s\n", phy); |
d9d660f6 JG |
877 | return -EINVAL; |
878 | } | |
879 | *lunp = 0; | |
880 | lunp++; | |
881 | if (kstrtouint(lunp, 10, &lun) || lun >= TRANSPORT_MAX_LUNS_PER_TPG) { | |
78574878 | 882 | pr_err("lun number not valid: %s\n", lunp); |
d9d660f6 JG |
883 | return -EINVAL; |
884 | } | |
885 | ||
886 | mutex_lock(&scsiback_mutex); | |
887 | list_for_each_entry(tpg_entry, &scsiback_list, tv_tpg_list) { | |
888 | if (!strcmp(phy, tpg_entry->tport->tport_name) || | |
889 | !strcmp(phy, tpg_entry->param_alias)) { | |
890 | spin_lock(&tpg_entry->se_tpg.tpg_lun_lock); | |
891 | if (tpg_entry->se_tpg.tpg_lun_list[lun]->lun_status == | |
892 | TRANSPORT_LUN_STATUS_ACTIVE) { | |
893 | if (!tpg_entry->tpg_nexus) | |
894 | error = "nexus undefined"; | |
895 | else | |
896 | tpg = tpg_entry; | |
897 | } | |
898 | spin_unlock(&tpg_entry->se_tpg.tpg_lun_lock); | |
899 | break; | |
900 | } | |
901 | } | |
902 | if (tpg) { | |
903 | mutex_lock(&tpg->tv_tpg_mutex); | |
904 | tpg->tv_tpg_fe_count++; | |
905 | mutex_unlock(&tpg->tv_tpg_mutex); | |
906 | } | |
907 | mutex_unlock(&scsiback_mutex); | |
908 | ||
909 | if (!tpg) { | |
78574878 | 910 | pr_err("%s:%d %s\n", phy, lun, error); |
d9d660f6 JG |
911 | return -ENODEV; |
912 | } | |
913 | ||
914 | new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL); | |
915 | if (new == NULL) { | |
916 | err = -ENOMEM; | |
917 | goto out_free; | |
918 | } | |
919 | ||
920 | spin_lock_irqsave(&info->v2p_lock, flags); | |
921 | ||
922 | /* Check double assignment to identical virtual ID */ | |
923 | list_for_each_entry(entry, head, l) { | |
924 | if ((entry->v.chn == v->chn) && | |
925 | (entry->v.tgt == v->tgt) && | |
926 | (entry->v.lun == v->lun)) { | |
78574878 | 927 | pr_warn("Virtual ID is already used. Assignment was not performed.\n"); |
d9d660f6 JG |
928 | err = -EEXIST; |
929 | goto out; | |
930 | } | |
931 | ||
932 | } | |
933 | ||
934 | /* Create a new translation entry and add to the list */ | |
935 | kref_init(&new->kref); | |
936 | new->v = *v; | |
937 | new->tpg = tpg; | |
938 | new->lun = lun; | |
939 | list_add_tail(&new->l, head); | |
940 | ||
941 | out: | |
942 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
943 | ||
944 | out_free: | |
945 | mutex_lock(&tpg->tv_tpg_mutex); | |
946 | tpg->tv_tpg_fe_count--; | |
947 | mutex_unlock(&tpg->tv_tpg_mutex); | |
948 | ||
949 | if (err) | |
950 | kfree(new); | |
951 | ||
952 | return err; | |
953 | } | |
954 | ||
955 | static void __scsiback_del_translation_entry(struct v2p_entry *entry) | |
956 | { | |
957 | list_del(&entry->l); | |
958 | kref_put(&entry->kref, scsiback_free_translation_entry); | |
959 | } | |
960 | ||
961 | /* | |
962 | Delete the translation entry specfied | |
963 | */ | |
964 | static int scsiback_del_translation_entry(struct vscsibk_info *info, | |
965 | struct ids_tuple *v) | |
966 | { | |
967 | struct v2p_entry *entry; | |
968 | struct list_head *head = &(info->v2p_entry_lists); | |
969 | unsigned long flags; | |
970 | ||
971 | spin_lock_irqsave(&info->v2p_lock, flags); | |
972 | /* Find out the translation entry specified */ | |
973 | list_for_each_entry(entry, head, l) { | |
974 | if ((entry->v.chn == v->chn) && | |
975 | (entry->v.tgt == v->tgt) && | |
976 | (entry->v.lun == v->lun)) { | |
977 | goto found; | |
978 | } | |
979 | } | |
980 | ||
981 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
982 | return 1; | |
983 | ||
984 | found: | |
985 | /* Delete the translation entry specfied */ | |
986 | __scsiback_del_translation_entry(entry); | |
987 | ||
988 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
989 | return 0; | |
990 | } | |
991 | ||
992 | static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state, | |
169e6cf0 | 993 | char *phy, struct ids_tuple *vir, int try) |
d9d660f6 JG |
994 | { |
995 | if (!scsiback_add_translation_entry(info, phy, vir)) { | |
996 | if (xenbus_printf(XBT_NIL, info->dev->nodename, state, | |
997 | "%d", XenbusStateInitialised)) { | |
78574878 | 998 | pr_err("xenbus_printf error %s\n", state); |
d9d660f6 JG |
999 | scsiback_del_translation_entry(info, vir); |
1000 | } | |
169e6cf0 | 1001 | } else if (!try) { |
d9d660f6 JG |
1002 | xenbus_printf(XBT_NIL, info->dev->nodename, state, |
1003 | "%d", XenbusStateClosed); | |
1004 | } | |
1005 | } | |
1006 | ||
1007 | static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state, | |
1008 | struct ids_tuple *vir) | |
1009 | { | |
1010 | if (!scsiback_del_translation_entry(info, vir)) { | |
1011 | if (xenbus_printf(XBT_NIL, info->dev->nodename, state, | |
1012 | "%d", XenbusStateClosed)) | |
78574878 | 1013 | pr_err("xenbus_printf error %s\n", state); |
d9d660f6 JG |
1014 | } |
1015 | } | |
1016 | ||
1017 | #define VSCSIBACK_OP_ADD_OR_DEL_LUN 1 | |
1018 | #define VSCSIBACK_OP_UPDATEDEV_STATE 2 | |
1019 | ||
1020 | static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op, | |
1021 | char *ent) | |
1022 | { | |
1023 | int err; | |
1024 | struct ids_tuple vir; | |
1025 | char *val; | |
1026 | int device_state; | |
1027 | char phy[VSCSI_NAMELEN]; | |
1028 | char str[64]; | |
1029 | char state[64]; | |
1030 | struct xenbus_device *dev = info->dev; | |
1031 | ||
1032 | /* read status */ | |
1033 | snprintf(state, sizeof(state), "vscsi-devs/%s/state", ent); | |
1034 | err = xenbus_scanf(XBT_NIL, dev->nodename, state, "%u", &device_state); | |
1035 | if (XENBUS_EXIST_ERR(err)) | |
1036 | return; | |
1037 | ||
1038 | /* physical SCSI device */ | |
1039 | snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent); | |
1040 | val = xenbus_read(XBT_NIL, dev->nodename, str, NULL); | |
1041 | if (IS_ERR(val)) { | |
1042 | xenbus_printf(XBT_NIL, dev->nodename, state, | |
1043 | "%d", XenbusStateClosed); | |
1044 | return; | |
1045 | } | |
1046 | strlcpy(phy, val, VSCSI_NAMELEN); | |
1047 | kfree(val); | |
1048 | ||
1049 | /* virtual SCSI device */ | |
1050 | snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", ent); | |
1051 | err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u", | |
1052 | &vir.hst, &vir.chn, &vir.tgt, &vir.lun); | |
1053 | if (XENBUS_EXIST_ERR(err)) { | |
1054 | xenbus_printf(XBT_NIL, dev->nodename, state, | |
1055 | "%d", XenbusStateClosed); | |
1056 | return; | |
1057 | } | |
1058 | ||
1059 | switch (op) { | |
1060 | case VSCSIBACK_OP_ADD_OR_DEL_LUN: | |
169e6cf0 JG |
1061 | switch (device_state) { |
1062 | case XenbusStateInitialising: | |
1063 | scsiback_do_add_lun(info, state, phy, &vir, 0); | |
1064 | break; | |
1065 | case XenbusStateConnected: | |
1066 | scsiback_do_add_lun(info, state, phy, &vir, 1); | |
1067 | break; | |
1068 | case XenbusStateClosing: | |
d9d660f6 | 1069 | scsiback_do_del_lun(info, state, &vir); |
169e6cf0 JG |
1070 | break; |
1071 | default: | |
1072 | break; | |
1073 | } | |
d9d660f6 JG |
1074 | break; |
1075 | ||
1076 | case VSCSIBACK_OP_UPDATEDEV_STATE: | |
1077 | if (device_state == XenbusStateInitialised) { | |
1078 | /* modify vscsi-devs/dev-x/state */ | |
1079 | if (xenbus_printf(XBT_NIL, dev->nodename, state, | |
1080 | "%d", XenbusStateConnected)) { | |
78574878 | 1081 | pr_err("xenbus_printf error %s\n", str); |
d9d660f6 JG |
1082 | scsiback_del_translation_entry(info, &vir); |
1083 | xenbus_printf(XBT_NIL, dev->nodename, state, | |
1084 | "%d", XenbusStateClosed); | |
1085 | } | |
1086 | } | |
1087 | break; | |
78574878 | 1088 | /* When it is necessary, processing is added here. */ |
d9d660f6 JG |
1089 | default: |
1090 | break; | |
1091 | } | |
1092 | } | |
1093 | ||
1094 | static void scsiback_do_lun_hotplug(struct vscsibk_info *info, int op) | |
1095 | { | |
1096 | int i; | |
1097 | char **dir; | |
1098 | unsigned int ndir = 0; | |
1099 | ||
1100 | dir = xenbus_directory(XBT_NIL, info->dev->nodename, "vscsi-devs", | |
1101 | &ndir); | |
1102 | if (IS_ERR(dir)) | |
1103 | return; | |
1104 | ||
1105 | for (i = 0; i < ndir; i++) | |
1106 | scsiback_do_1lun_hotplug(info, op, dir[i]); | |
1107 | ||
1108 | kfree(dir); | |
1109 | } | |
1110 | ||
1111 | static void scsiback_frontend_changed(struct xenbus_device *dev, | |
1112 | enum xenbus_state frontend_state) | |
1113 | { | |
1114 | struct vscsibk_info *info = dev_get_drvdata(&dev->dev); | |
1115 | ||
1116 | switch (frontend_state) { | |
1117 | case XenbusStateInitialising: | |
1118 | break; | |
1119 | ||
1120 | case XenbusStateInitialised: | |
1121 | if (scsiback_map(info)) | |
1122 | break; | |
1123 | ||
1124 | scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); | |
1125 | xenbus_switch_state(dev, XenbusStateConnected); | |
1126 | break; | |
1127 | ||
1128 | case XenbusStateConnected: | |
1129 | scsiback_do_lun_hotplug(info, VSCSIBACK_OP_UPDATEDEV_STATE); | |
1130 | ||
1131 | if (dev->state == XenbusStateConnected) | |
1132 | break; | |
1133 | ||
1134 | xenbus_switch_state(dev, XenbusStateConnected); | |
1135 | break; | |
1136 | ||
1137 | case XenbusStateClosing: | |
1138 | if (info->irq) | |
1139 | scsiback_disconnect(info); | |
1140 | ||
1141 | xenbus_switch_state(dev, XenbusStateClosing); | |
1142 | break; | |
1143 | ||
1144 | case XenbusStateClosed: | |
1145 | xenbus_switch_state(dev, XenbusStateClosed); | |
1146 | if (xenbus_dev_is_online(dev)) | |
1147 | break; | |
1148 | /* fall through if not online */ | |
1149 | case XenbusStateUnknown: | |
1150 | device_unregister(&dev->dev); | |
1151 | break; | |
1152 | ||
1153 | case XenbusStateReconfiguring: | |
1154 | scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); | |
1155 | xenbus_switch_state(dev, XenbusStateReconfigured); | |
1156 | ||
1157 | break; | |
1158 | ||
1159 | default: | |
1160 | xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", | |
1161 | frontend_state); | |
1162 | break; | |
1163 | } | |
1164 | } | |
1165 | ||
1166 | /* | |
1167 | Release the translation entry specfied | |
1168 | */ | |
1169 | static void scsiback_release_translation_entry(struct vscsibk_info *info) | |
1170 | { | |
1171 | struct v2p_entry *entry, *tmp; | |
1172 | struct list_head *head = &(info->v2p_entry_lists); | |
1173 | unsigned long flags; | |
1174 | ||
1175 | spin_lock_irqsave(&info->v2p_lock, flags); | |
1176 | ||
1177 | list_for_each_entry_safe(entry, tmp, head, l) | |
1178 | __scsiback_del_translation_entry(entry); | |
1179 | ||
1180 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
1181 | } | |
1182 | ||
1183 | static int scsiback_remove(struct xenbus_device *dev) | |
1184 | { | |
1185 | struct vscsibk_info *info = dev_get_drvdata(&dev->dev); | |
1186 | ||
1187 | if (info->irq) | |
1188 | scsiback_disconnect(info); | |
1189 | ||
1190 | scsiback_release_translation_entry(info); | |
1191 | ||
1192 | dev_set_drvdata(&dev->dev, NULL); | |
1193 | ||
1194 | return 0; | |
1195 | } | |
1196 | ||
1197 | static int scsiback_probe(struct xenbus_device *dev, | |
1198 | const struct xenbus_device_id *id) | |
1199 | { | |
1200 | int err; | |
1201 | ||
1202 | struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info), | |
1203 | GFP_KERNEL); | |
1204 | ||
78574878 | 1205 | pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id); |
d9d660f6 JG |
1206 | |
1207 | if (!info) { | |
1208 | xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure"); | |
1209 | return -ENOMEM; | |
1210 | } | |
1211 | info->dev = dev; | |
1212 | dev_set_drvdata(&dev->dev, info); | |
1213 | ||
1214 | info->domid = dev->otherend_id; | |
1215 | spin_lock_init(&info->ring_lock); | |
1216 | info->ring_error = 0; | |
1217 | atomic_set(&info->nr_unreplied_reqs, 0); | |
1218 | init_waitqueue_head(&info->waiting_to_free); | |
1219 | info->dev = dev; | |
1220 | info->irq = 0; | |
1221 | INIT_LIST_HEAD(&info->v2p_entry_lists); | |
1222 | spin_lock_init(&info->v2p_lock); | |
1223 | ||
1224 | err = xenbus_printf(XBT_NIL, dev->nodename, "feature-sg-grant", "%u", | |
1225 | SG_ALL); | |
1226 | if (err) | |
1227 | xenbus_dev_error(dev, err, "writing feature-sg-grant"); | |
1228 | ||
1229 | err = xenbus_switch_state(dev, XenbusStateInitWait); | |
1230 | if (err) | |
1231 | goto fail; | |
1232 | ||
1233 | return 0; | |
1234 | ||
1235 | fail: | |
78574878 | 1236 | pr_warn("%s failed\n", __func__); |
d9d660f6 JG |
1237 | scsiback_remove(dev); |
1238 | ||
1239 | return err; | |
1240 | } | |
1241 | ||
1242 | static char *scsiback_dump_proto_id(struct scsiback_tport *tport) | |
1243 | { | |
1244 | switch (tport->tport_proto_id) { | |
1245 | case SCSI_PROTOCOL_SAS: | |
1246 | return "SAS"; | |
1247 | case SCSI_PROTOCOL_FCP: | |
1248 | return "FCP"; | |
1249 | case SCSI_PROTOCOL_ISCSI: | |
1250 | return "iSCSI"; | |
1251 | default: | |
1252 | break; | |
1253 | } | |
1254 | ||
1255 | return "Unknown"; | |
1256 | } | |
1257 | ||
1258 | static u8 scsiback_get_fabric_proto_ident(struct se_portal_group *se_tpg) | |
1259 | { | |
1260 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1261 | struct scsiback_tpg, se_tpg); | |
1262 | struct scsiback_tport *tport = tpg->tport; | |
1263 | ||
1264 | switch (tport->tport_proto_id) { | |
1265 | case SCSI_PROTOCOL_SAS: | |
1266 | return sas_get_fabric_proto_ident(se_tpg); | |
1267 | case SCSI_PROTOCOL_FCP: | |
1268 | return fc_get_fabric_proto_ident(se_tpg); | |
1269 | case SCSI_PROTOCOL_ISCSI: | |
1270 | return iscsi_get_fabric_proto_ident(se_tpg); | |
1271 | default: | |
1272 | pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", | |
1273 | tport->tport_proto_id); | |
1274 | break; | |
1275 | } | |
1276 | ||
1277 | return sas_get_fabric_proto_ident(se_tpg); | |
1278 | } | |
1279 | ||
1280 | static char *scsiback_get_fabric_wwn(struct se_portal_group *se_tpg) | |
1281 | { | |
1282 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1283 | struct scsiback_tpg, se_tpg); | |
1284 | struct scsiback_tport *tport = tpg->tport; | |
1285 | ||
1286 | return &tport->tport_name[0]; | |
1287 | } | |
1288 | ||
1289 | static u16 scsiback_get_tag(struct se_portal_group *se_tpg) | |
1290 | { | |
1291 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1292 | struct scsiback_tpg, se_tpg); | |
1293 | return tpg->tport_tpgt; | |
1294 | } | |
1295 | ||
1296 | static u32 scsiback_get_default_depth(struct se_portal_group *se_tpg) | |
1297 | { | |
1298 | return 1; | |
1299 | } | |
1300 | ||
1301 | static u32 | |
1302 | scsiback_get_pr_transport_id(struct se_portal_group *se_tpg, | |
1303 | struct se_node_acl *se_nacl, | |
1304 | struct t10_pr_registration *pr_reg, | |
1305 | int *format_code, | |
1306 | unsigned char *buf) | |
1307 | { | |
1308 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1309 | struct scsiback_tpg, se_tpg); | |
1310 | struct scsiback_tport *tport = tpg->tport; | |
1311 | ||
1312 | switch (tport->tport_proto_id) { | |
1313 | case SCSI_PROTOCOL_SAS: | |
1314 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
1315 | format_code, buf); | |
1316 | case SCSI_PROTOCOL_FCP: | |
1317 | return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
1318 | format_code, buf); | |
1319 | case SCSI_PROTOCOL_ISCSI: | |
1320 | return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
1321 | format_code, buf); | |
1322 | default: | |
1323 | pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", | |
1324 | tport->tport_proto_id); | |
1325 | break; | |
1326 | } | |
1327 | ||
1328 | return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, | |
1329 | format_code, buf); | |
1330 | } | |
1331 | ||
1332 | static u32 | |
1333 | scsiback_get_pr_transport_id_len(struct se_portal_group *se_tpg, | |
1334 | struct se_node_acl *se_nacl, | |
1335 | struct t10_pr_registration *pr_reg, | |
1336 | int *format_code) | |
1337 | { | |
1338 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1339 | struct scsiback_tpg, se_tpg); | |
1340 | struct scsiback_tport *tport = tpg->tport; | |
1341 | ||
1342 | switch (tport->tport_proto_id) { | |
1343 | case SCSI_PROTOCOL_SAS: | |
1344 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
1345 | format_code); | |
1346 | case SCSI_PROTOCOL_FCP: | |
1347 | return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
1348 | format_code); | |
1349 | case SCSI_PROTOCOL_ISCSI: | |
1350 | return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
1351 | format_code); | |
1352 | default: | |
1353 | pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", | |
1354 | tport->tport_proto_id); | |
1355 | break; | |
1356 | } | |
1357 | ||
1358 | return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, | |
1359 | format_code); | |
1360 | } | |
1361 | ||
1362 | static char * | |
1363 | scsiback_parse_pr_out_transport_id(struct se_portal_group *se_tpg, | |
1364 | const char *buf, | |
1365 | u32 *out_tid_len, | |
1366 | char **port_nexus_ptr) | |
1367 | { | |
1368 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1369 | struct scsiback_tpg, se_tpg); | |
1370 | struct scsiback_tport *tport = tpg->tport; | |
1371 | ||
1372 | switch (tport->tport_proto_id) { | |
1373 | case SCSI_PROTOCOL_SAS: | |
1374 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
1375 | port_nexus_ptr); | |
1376 | case SCSI_PROTOCOL_FCP: | |
1377 | return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
1378 | port_nexus_ptr); | |
1379 | case SCSI_PROTOCOL_ISCSI: | |
1380 | return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
1381 | port_nexus_ptr); | |
1382 | default: | |
1383 | pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", | |
1384 | tport->tport_proto_id); | |
1385 | break; | |
1386 | } | |
1387 | ||
1388 | return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, | |
1389 | port_nexus_ptr); | |
1390 | } | |
1391 | ||
1392 | static struct se_wwn * | |
1393 | scsiback_make_tport(struct target_fabric_configfs *tf, | |
1394 | struct config_group *group, | |
1395 | const char *name) | |
1396 | { | |
1397 | struct scsiback_tport *tport; | |
1398 | char *ptr; | |
1399 | u64 wwpn = 0; | |
1400 | int off = 0; | |
1401 | ||
1402 | tport = kzalloc(sizeof(struct scsiback_tport), GFP_KERNEL); | |
1403 | if (!tport) | |
1404 | return ERR_PTR(-ENOMEM); | |
1405 | ||
1406 | tport->tport_wwpn = wwpn; | |
1407 | /* | |
1408 | * Determine the emulated Protocol Identifier and Target Port Name | |
1409 | * based on the incoming configfs directory name. | |
1410 | */ | |
1411 | ptr = strstr(name, "naa."); | |
1412 | if (ptr) { | |
1413 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
1414 | goto check_len; | |
1415 | } | |
1416 | ptr = strstr(name, "fc."); | |
1417 | if (ptr) { | |
1418 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
1419 | off = 3; /* Skip over "fc." */ | |
1420 | goto check_len; | |
1421 | } | |
1422 | ptr = strstr(name, "iqn."); | |
1423 | if (ptr) { | |
1424 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
1425 | goto check_len; | |
1426 | } | |
1427 | ||
1428 | pr_err("Unable to locate prefix for emulated Target Port: %s\n", name); | |
1429 | kfree(tport); | |
1430 | return ERR_PTR(-EINVAL); | |
1431 | ||
1432 | check_len: | |
1433 | if (strlen(name) >= VSCSI_NAMELEN) { | |
1434 | pr_err("Emulated %s Address: %s, exceeds max: %d\n", name, | |
1435 | scsiback_dump_proto_id(tport), VSCSI_NAMELEN); | |
1436 | kfree(tport); | |
1437 | return ERR_PTR(-EINVAL); | |
1438 | } | |
1439 | snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]); | |
1440 | ||
78574878 | 1441 | pr_debug("Allocated emulated Target %s Address: %s\n", |
d9d660f6 JG |
1442 | scsiback_dump_proto_id(tport), name); |
1443 | ||
1444 | return &tport->tport_wwn; | |
1445 | } | |
1446 | ||
1447 | static void scsiback_drop_tport(struct se_wwn *wwn) | |
1448 | { | |
1449 | struct scsiback_tport *tport = container_of(wwn, | |
1450 | struct scsiback_tport, tport_wwn); | |
1451 | ||
78574878 | 1452 | pr_debug("Deallocating emulated Target %s Address: %s\n", |
d9d660f6 JG |
1453 | scsiback_dump_proto_id(tport), tport->tport_name); |
1454 | ||
1455 | kfree(tport); | |
1456 | } | |
1457 | ||
1458 | static struct se_node_acl * | |
1459 | scsiback_alloc_fabric_acl(struct se_portal_group *se_tpg) | |
1460 | { | |
1461 | return kzalloc(sizeof(struct se_node_acl), GFP_KERNEL); | |
1462 | } | |
1463 | ||
1464 | static void | |
1465 | scsiback_release_fabric_acl(struct se_portal_group *se_tpg, | |
1466 | struct se_node_acl *se_nacl) | |
1467 | { | |
1468 | kfree(se_nacl); | |
1469 | } | |
1470 | ||
1471 | static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg) | |
1472 | { | |
1473 | return 1; | |
1474 | } | |
1475 | ||
1476 | static int scsiback_check_stop_free(struct se_cmd *se_cmd) | |
1477 | { | |
1478 | /* | |
78574878 TC |
1479 | * Do not release struct se_cmd's containing a valid TMR pointer. |
1480 | * These will be released directly in scsiback_device_action() | |
d9d660f6 JG |
1481 | * with transport_generic_free_cmd(). |
1482 | */ | |
1483 | if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) | |
1484 | return 0; | |
1485 | ||
1486 | transport_generic_free_cmd(se_cmd, 0); | |
1487 | return 1; | |
1488 | } | |
1489 | ||
1490 | static void scsiback_release_cmd(struct se_cmd *se_cmd) | |
1491 | { | |
1492 | struct vscsibk_pend *pending_req = container_of(se_cmd, | |
1493 | struct vscsibk_pend, se_cmd); | |
1494 | ||
1495 | kmem_cache_free(scsiback_cachep, pending_req); | |
1496 | } | |
1497 | ||
1498 | static int scsiback_shutdown_session(struct se_session *se_sess) | |
1499 | { | |
1500 | return 0; | |
1501 | } | |
1502 | ||
1503 | static void scsiback_close_session(struct se_session *se_sess) | |
1504 | { | |
1505 | } | |
1506 | ||
1507 | static u32 scsiback_sess_get_index(struct se_session *se_sess) | |
1508 | { | |
1509 | return 0; | |
1510 | } | |
1511 | ||
1512 | static int scsiback_write_pending(struct se_cmd *se_cmd) | |
1513 | { | |
1514 | /* Go ahead and process the write immediately */ | |
1515 | target_execute_cmd(se_cmd); | |
1516 | ||
1517 | return 0; | |
1518 | } | |
1519 | ||
1520 | static int scsiback_write_pending_status(struct se_cmd *se_cmd) | |
1521 | { | |
1522 | return 0; | |
1523 | } | |
1524 | ||
1525 | static void scsiback_set_default_node_attrs(struct se_node_acl *nacl) | |
1526 | { | |
1527 | } | |
1528 | ||
1529 | static u32 scsiback_get_task_tag(struct se_cmd *se_cmd) | |
1530 | { | |
1531 | struct vscsibk_pend *pending_req = container_of(se_cmd, | |
1532 | struct vscsibk_pend, se_cmd); | |
1533 | ||
1534 | return pending_req->rqid; | |
1535 | } | |
1536 | ||
1537 | static int scsiback_get_cmd_state(struct se_cmd *se_cmd) | |
1538 | { | |
1539 | return 0; | |
1540 | } | |
1541 | ||
1542 | static int scsiback_queue_data_in(struct se_cmd *se_cmd) | |
1543 | { | |
1544 | struct vscsibk_pend *pending_req = container_of(se_cmd, | |
1545 | struct vscsibk_pend, se_cmd); | |
1546 | ||
1547 | pending_req->result = SAM_STAT_GOOD; | |
1548 | scsiback_cmd_done(pending_req); | |
1549 | return 0; | |
1550 | } | |
1551 | ||
1552 | static int scsiback_queue_status(struct se_cmd *se_cmd) | |
1553 | { | |
1554 | struct vscsibk_pend *pending_req = container_of(se_cmd, | |
1555 | struct vscsibk_pend, se_cmd); | |
1556 | ||
1557 | if (se_cmd->sense_buffer && | |
1558 | ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || | |
1559 | (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) | |
1560 | pending_req->result = (DRIVER_SENSE << 24) | | |
1561 | SAM_STAT_CHECK_CONDITION; | |
1562 | else | |
1563 | pending_req->result = se_cmd->scsi_status; | |
1564 | ||
1565 | scsiback_cmd_done(pending_req); | |
1566 | return 0; | |
1567 | } | |
1568 | ||
1569 | static void scsiback_queue_tm_rsp(struct se_cmd *se_cmd) | |
1570 | { | |
1571 | struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; | |
1572 | struct scsiback_tmr *tmr = se_tmr->fabric_tmr_ptr; | |
1573 | ||
1574 | atomic_set(&tmr->tmr_complete, 1); | |
1575 | wake_up(&tmr->tmr_wait); | |
1576 | } | |
1577 | ||
1578 | static void scsiback_aborted_task(struct se_cmd *se_cmd) | |
1579 | { | |
1580 | } | |
1581 | ||
1582 | static ssize_t scsiback_tpg_param_show_alias(struct se_portal_group *se_tpg, | |
1583 | char *page) | |
1584 | { | |
1585 | struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, | |
1586 | se_tpg); | |
1587 | ssize_t rb; | |
1588 | ||
1589 | mutex_lock(&tpg->tv_tpg_mutex); | |
1590 | rb = snprintf(page, PAGE_SIZE, "%s\n", tpg->param_alias); | |
1591 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1592 | ||
1593 | return rb; | |
1594 | } | |
1595 | ||
1596 | static ssize_t scsiback_tpg_param_store_alias(struct se_portal_group *se_tpg, | |
1597 | const char *page, size_t count) | |
1598 | { | |
1599 | struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, | |
1600 | se_tpg); | |
1601 | int len; | |
1602 | ||
1603 | if (strlen(page) >= VSCSI_NAMELEN) { | |
1604 | pr_err("param alias: %s, exceeds max: %d\n", page, | |
1605 | VSCSI_NAMELEN); | |
1606 | return -EINVAL; | |
1607 | } | |
1608 | ||
1609 | mutex_lock(&tpg->tv_tpg_mutex); | |
1610 | len = snprintf(tpg->param_alias, VSCSI_NAMELEN, "%s", page); | |
1611 | if (tpg->param_alias[len - 1] == '\n') | |
1612 | tpg->param_alias[len - 1] = '\0'; | |
1613 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1614 | ||
1615 | return count; | |
1616 | } | |
1617 | ||
1618 | TF_TPG_PARAM_ATTR(scsiback, alias, S_IRUGO | S_IWUSR); | |
1619 | ||
1620 | static struct configfs_attribute *scsiback_param_attrs[] = { | |
1621 | &scsiback_tpg_param_alias.attr, | |
1622 | NULL, | |
1623 | }; | |
1624 | ||
1625 | static int scsiback_make_nexus(struct scsiback_tpg *tpg, | |
1626 | const char *name) | |
1627 | { | |
1628 | struct se_portal_group *se_tpg; | |
1629 | struct se_session *se_sess; | |
1630 | struct scsiback_nexus *tv_nexus; | |
1631 | ||
1632 | mutex_lock(&tpg->tv_tpg_mutex); | |
1633 | if (tpg->tpg_nexus) { | |
1634 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1635 | pr_debug("tpg->tpg_nexus already exists\n"); | |
1636 | return -EEXIST; | |
1637 | } | |
1638 | se_tpg = &tpg->se_tpg; | |
1639 | ||
1640 | tv_nexus = kzalloc(sizeof(struct scsiback_nexus), GFP_KERNEL); | |
1641 | if (!tv_nexus) { | |
1642 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1643 | return -ENOMEM; | |
1644 | } | |
1645 | /* | |
78574878 | 1646 | * Initialize the struct se_session pointer |
d9d660f6 JG |
1647 | */ |
1648 | tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL); | |
1649 | if (IS_ERR(tv_nexus->tvn_se_sess)) { | |
1650 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1651 | kfree(tv_nexus); | |
1652 | return -ENOMEM; | |
1653 | } | |
1654 | se_sess = tv_nexus->tvn_se_sess; | |
1655 | /* | |
1656 | * Since we are running in 'demo mode' this call with generate a | |
1657 | * struct se_node_acl for the scsiback struct se_portal_group with | |
1658 | * the SCSI Initiator port name of the passed configfs group 'name'. | |
1659 | */ | |
1660 | tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1661 | se_tpg, (unsigned char *)name); | |
1662 | if (!tv_nexus->tvn_se_sess->se_node_acl) { | |
1663 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1664 | pr_debug("core_tpg_check_initiator_node_acl() failed for %s\n", | |
1665 | name); | |
1666 | goto out; | |
1667 | } | |
2f450cc1 BVA |
1668 | /* Now register the TCM pvscsi virtual I_T Nexus as active. */ |
1669 | transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, | |
d9d660f6 JG |
1670 | tv_nexus->tvn_se_sess, tv_nexus); |
1671 | tpg->tpg_nexus = tv_nexus; | |
1672 | ||
1673 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1674 | return 0; | |
1675 | ||
1676 | out: | |
1677 | transport_free_session(se_sess); | |
1678 | kfree(tv_nexus); | |
1679 | return -ENOMEM; | |
1680 | } | |
1681 | ||
1682 | static int scsiback_drop_nexus(struct scsiback_tpg *tpg) | |
1683 | { | |
1684 | struct se_session *se_sess; | |
1685 | struct scsiback_nexus *tv_nexus; | |
1686 | ||
1687 | mutex_lock(&tpg->tv_tpg_mutex); | |
1688 | tv_nexus = tpg->tpg_nexus; | |
1689 | if (!tv_nexus) { | |
1690 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1691 | return -ENODEV; | |
1692 | } | |
1693 | ||
1694 | se_sess = tv_nexus->tvn_se_sess; | |
1695 | if (!se_sess) { | |
1696 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1697 | return -ENODEV; | |
1698 | } | |
1699 | ||
1700 | if (tpg->tv_tpg_port_count != 0) { | |
1701 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1702 | pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG port count: %d\n", | |
1703 | tpg->tv_tpg_port_count); | |
1704 | return -EBUSY; | |
1705 | } | |
1706 | ||
1707 | if (tpg->tv_tpg_fe_count != 0) { | |
1708 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1709 | pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG frontend count: %d\n", | |
1710 | tpg->tv_tpg_fe_count); | |
1711 | return -EBUSY; | |
1712 | } | |
1713 | ||
78574878 | 1714 | pr_debug("Removing I_T Nexus to emulated %s Initiator Port: %s\n", |
d9d660f6 JG |
1715 | scsiback_dump_proto_id(tpg->tport), |
1716 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
1717 | ||
1718 | /* | |
1719 | * Release the SCSI I_T Nexus to the emulated xen-pvscsi Target Port | |
1720 | */ | |
1721 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
1722 | tpg->tpg_nexus = NULL; | |
1723 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1724 | ||
1725 | kfree(tv_nexus); | |
1726 | return 0; | |
1727 | } | |
1728 | ||
1729 | static ssize_t scsiback_tpg_show_nexus(struct se_portal_group *se_tpg, | |
1730 | char *page) | |
1731 | { | |
1732 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1733 | struct scsiback_tpg, se_tpg); | |
1734 | struct scsiback_nexus *tv_nexus; | |
1735 | ssize_t ret; | |
1736 | ||
1737 | mutex_lock(&tpg->tv_tpg_mutex); | |
1738 | tv_nexus = tpg->tpg_nexus; | |
1739 | if (!tv_nexus) { | |
1740 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1741 | return -ENODEV; | |
1742 | } | |
1743 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1744 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
1745 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1746 | ||
1747 | return ret; | |
1748 | } | |
1749 | ||
1750 | static ssize_t scsiback_tpg_store_nexus(struct se_portal_group *se_tpg, | |
1751 | const char *page, | |
1752 | size_t count) | |
1753 | { | |
1754 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1755 | struct scsiback_tpg, se_tpg); | |
1756 | struct scsiback_tport *tport_wwn = tpg->tport; | |
1757 | unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr; | |
1758 | int ret; | |
1759 | /* | |
78574878 | 1760 | * Shutdown the active I_T nexus if 'NULL' is passed. |
d9d660f6 JG |
1761 | */ |
1762 | if (!strncmp(page, "NULL", 4)) { | |
1763 | ret = scsiback_drop_nexus(tpg); | |
1764 | return (!ret) ? count : ret; | |
1765 | } | |
1766 | /* | |
1767 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1768 | * the fabric protocol_id set in scsiback_make_tport(), and call | |
1769 | * scsiback_make_nexus(). | |
1770 | */ | |
1771 | if (strlen(page) >= VSCSI_NAMELEN) { | |
1772 | pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n", | |
1773 | page, VSCSI_NAMELEN); | |
1774 | return -EINVAL; | |
1775 | } | |
1776 | snprintf(&i_port[0], VSCSI_NAMELEN, "%s", page); | |
1777 | ||
1778 | ptr = strstr(i_port, "naa."); | |
1779 | if (ptr) { | |
1780 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
1781 | pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n", | |
1782 | i_port, scsiback_dump_proto_id(tport_wwn)); | |
1783 | return -EINVAL; | |
1784 | } | |
1785 | port_ptr = &i_port[0]; | |
1786 | goto check_newline; | |
1787 | } | |
1788 | ptr = strstr(i_port, "fc."); | |
1789 | if (ptr) { | |
1790 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
1791 | pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n", | |
1792 | i_port, scsiback_dump_proto_id(tport_wwn)); | |
1793 | return -EINVAL; | |
1794 | } | |
1795 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1796 | goto check_newline; | |
1797 | } | |
1798 | ptr = strstr(i_port, "iqn."); | |
1799 | if (ptr) { | |
1800 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
1801 | pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n", | |
1802 | i_port, scsiback_dump_proto_id(tport_wwn)); | |
1803 | return -EINVAL; | |
1804 | } | |
1805 | port_ptr = &i_port[0]; | |
1806 | goto check_newline; | |
1807 | } | |
1808 | pr_err("Unable to locate prefix for emulated Initiator Port: %s\n", | |
1809 | i_port); | |
1810 | return -EINVAL; | |
1811 | /* | |
1812 | * Clear any trailing newline for the NAA WWN | |
1813 | */ | |
1814 | check_newline: | |
1815 | if (i_port[strlen(i_port) - 1] == '\n') | |
1816 | i_port[strlen(i_port) - 1] = '\0'; | |
1817 | ||
1818 | ret = scsiback_make_nexus(tpg, port_ptr); | |
1819 | if (ret < 0) | |
1820 | return ret; | |
1821 | ||
1822 | return count; | |
1823 | } | |
1824 | ||
1825 | TF_TPG_BASE_ATTR(scsiback, nexus, S_IRUGO | S_IWUSR); | |
1826 | ||
1827 | static struct configfs_attribute *scsiback_tpg_attrs[] = { | |
1828 | &scsiback_tpg_nexus.attr, | |
1829 | NULL, | |
1830 | }; | |
1831 | ||
1832 | static ssize_t | |
1833 | scsiback_wwn_show_attr_version(struct target_fabric_configfs *tf, | |
1834 | char *page) | |
1835 | { | |
1836 | return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on " | |
1837 | UTS_RELEASE"\n", | |
1838 | VSCSI_VERSION, utsname()->sysname, utsname()->machine); | |
1839 | } | |
1840 | ||
1841 | TF_WWN_ATTR_RO(scsiback, version); | |
1842 | ||
1843 | static struct configfs_attribute *scsiback_wwn_attrs[] = { | |
1844 | &scsiback_wwn_version.attr, | |
1845 | NULL, | |
1846 | }; | |
1847 | ||
1848 | static char *scsiback_get_fabric_name(void) | |
1849 | { | |
1850 | return "xen-pvscsi"; | |
1851 | } | |
1852 | ||
1853 | static int scsiback_port_link(struct se_portal_group *se_tpg, | |
1854 | struct se_lun *lun) | |
1855 | { | |
1856 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1857 | struct scsiback_tpg, se_tpg); | |
1858 | ||
1859 | mutex_lock(&tpg->tv_tpg_mutex); | |
1860 | tpg->tv_tpg_port_count++; | |
1861 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1862 | ||
1863 | return 0; | |
1864 | } | |
1865 | ||
1866 | static void scsiback_port_unlink(struct se_portal_group *se_tpg, | |
1867 | struct se_lun *lun) | |
1868 | { | |
1869 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1870 | struct scsiback_tpg, se_tpg); | |
1871 | ||
1872 | mutex_lock(&tpg->tv_tpg_mutex); | |
1873 | tpg->tv_tpg_port_count--; | |
1874 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1875 | } | |
1876 | ||
1877 | static struct se_portal_group * | |
1878 | scsiback_make_tpg(struct se_wwn *wwn, | |
1879 | struct config_group *group, | |
1880 | const char *name) | |
1881 | { | |
1882 | struct scsiback_tport *tport = container_of(wwn, | |
1883 | struct scsiback_tport, tport_wwn); | |
1884 | ||
1885 | struct scsiback_tpg *tpg; | |
495daef9 | 1886 | u16 tpgt; |
d9d660f6 JG |
1887 | int ret; |
1888 | ||
1889 | if (strstr(name, "tpgt_") != name) | |
1890 | return ERR_PTR(-EINVAL); | |
495daef9 DC |
1891 | ret = kstrtou16(name + 5, 10, &tpgt); |
1892 | if (ret) | |
1893 | return ERR_PTR(ret); | |
d9d660f6 JG |
1894 | |
1895 | tpg = kzalloc(sizeof(struct scsiback_tpg), GFP_KERNEL); | |
1896 | if (!tpg) | |
1897 | return ERR_PTR(-ENOMEM); | |
1898 | ||
1899 | mutex_init(&tpg->tv_tpg_mutex); | |
1900 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
1901 | INIT_LIST_HEAD(&tpg->info_list); | |
1902 | tpg->tport = tport; | |
1903 | tpg->tport_tpgt = tpgt; | |
1904 | ||
1905 | ret = core_tpg_register(&scsiback_fabric_configfs->tf_ops, wwn, | |
1906 | &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL); | |
1907 | if (ret < 0) { | |
1908 | kfree(tpg); | |
1909 | return NULL; | |
1910 | } | |
1911 | mutex_lock(&scsiback_mutex); | |
1912 | list_add_tail(&tpg->tv_tpg_list, &scsiback_list); | |
1913 | mutex_unlock(&scsiback_mutex); | |
1914 | ||
1915 | return &tpg->se_tpg; | |
1916 | } | |
1917 | ||
1918 | static void scsiback_drop_tpg(struct se_portal_group *se_tpg) | |
1919 | { | |
1920 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1921 | struct scsiback_tpg, se_tpg); | |
1922 | ||
1923 | mutex_lock(&scsiback_mutex); | |
1924 | list_del(&tpg->tv_tpg_list); | |
1925 | mutex_unlock(&scsiback_mutex); | |
1926 | /* | |
1927 | * Release the virtual I_T Nexus for this xen-pvscsi TPG | |
1928 | */ | |
1929 | scsiback_drop_nexus(tpg); | |
1930 | /* | |
78574878 | 1931 | * Deregister the se_tpg from TCM. |
d9d660f6 JG |
1932 | */ |
1933 | core_tpg_deregister(se_tpg); | |
1934 | kfree(tpg); | |
1935 | } | |
1936 | ||
1937 | static int scsiback_check_true(struct se_portal_group *se_tpg) | |
1938 | { | |
1939 | return 1; | |
1940 | } | |
1941 | ||
1942 | static int scsiback_check_false(struct se_portal_group *se_tpg) | |
1943 | { | |
1944 | return 0; | |
1945 | } | |
1946 | ||
1947 | static struct target_core_fabric_ops scsiback_ops = { | |
1948 | .get_fabric_name = scsiback_get_fabric_name, | |
1949 | .get_fabric_proto_ident = scsiback_get_fabric_proto_ident, | |
1950 | .tpg_get_wwn = scsiback_get_fabric_wwn, | |
1951 | .tpg_get_tag = scsiback_get_tag, | |
1952 | .tpg_get_default_depth = scsiback_get_default_depth, | |
1953 | .tpg_get_pr_transport_id = scsiback_get_pr_transport_id, | |
1954 | .tpg_get_pr_transport_id_len = scsiback_get_pr_transport_id_len, | |
1955 | .tpg_parse_pr_out_transport_id = scsiback_parse_pr_out_transport_id, | |
1956 | .tpg_check_demo_mode = scsiback_check_true, | |
1957 | .tpg_check_demo_mode_cache = scsiback_check_true, | |
1958 | .tpg_check_demo_mode_write_protect = scsiback_check_false, | |
1959 | .tpg_check_prod_mode_write_protect = scsiback_check_false, | |
1960 | .tpg_alloc_fabric_acl = scsiback_alloc_fabric_acl, | |
1961 | .tpg_release_fabric_acl = scsiback_release_fabric_acl, | |
1962 | .tpg_get_inst_index = scsiback_tpg_get_inst_index, | |
1963 | .check_stop_free = scsiback_check_stop_free, | |
1964 | .release_cmd = scsiback_release_cmd, | |
1965 | .put_session = NULL, | |
1966 | .shutdown_session = scsiback_shutdown_session, | |
1967 | .close_session = scsiback_close_session, | |
1968 | .sess_get_index = scsiback_sess_get_index, | |
1969 | .sess_get_initiator_sid = NULL, | |
1970 | .write_pending = scsiback_write_pending, | |
1971 | .write_pending_status = scsiback_write_pending_status, | |
1972 | .set_default_node_attributes = scsiback_set_default_node_attrs, | |
1973 | .get_task_tag = scsiback_get_task_tag, | |
1974 | .get_cmd_state = scsiback_get_cmd_state, | |
1975 | .queue_data_in = scsiback_queue_data_in, | |
1976 | .queue_status = scsiback_queue_status, | |
1977 | .queue_tm_rsp = scsiback_queue_tm_rsp, | |
1978 | .aborted_task = scsiback_aborted_task, | |
1979 | /* | |
1980 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
1981 | */ | |
1982 | .fabric_make_wwn = scsiback_make_tport, | |
1983 | .fabric_drop_wwn = scsiback_drop_tport, | |
1984 | .fabric_make_tpg = scsiback_make_tpg, | |
1985 | .fabric_drop_tpg = scsiback_drop_tpg, | |
1986 | .fabric_post_link = scsiback_port_link, | |
1987 | .fabric_pre_unlink = scsiback_port_unlink, | |
1988 | .fabric_make_np = NULL, | |
1989 | .fabric_drop_np = NULL, | |
1990 | #if 0 | |
1991 | .fabric_make_nodeacl = scsiback_make_nodeacl, | |
1992 | .fabric_drop_nodeacl = scsiback_drop_nodeacl, | |
1993 | #endif | |
1994 | }; | |
1995 | ||
1996 | static int scsiback_register_configfs(void) | |
1997 | { | |
1998 | struct target_fabric_configfs *fabric; | |
1999 | int ret; | |
2000 | ||
78574878 | 2001 | pr_debug("fabric module %s on %s/%s on "UTS_RELEASE"\n", |
d9d660f6 JG |
2002 | VSCSI_VERSION, utsname()->sysname, utsname()->machine); |
2003 | /* | |
2004 | * Register the top level struct config_item_type with TCM core | |
2005 | */ | |
2006 | fabric = target_fabric_configfs_init(THIS_MODULE, "xen-pvscsi"); | |
2007 | if (IS_ERR(fabric)) | |
2008 | return PTR_ERR(fabric); | |
2009 | ||
2010 | /* | |
2011 | * Setup fabric->tf_ops from our local scsiback_ops | |
2012 | */ | |
2013 | fabric->tf_ops = scsiback_ops; | |
2014 | /* | |
2015 | * Setup default attribute lists for various fabric->tf_cit_tmpl | |
2016 | */ | |
2017 | fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = scsiback_wwn_attrs; | |
2018 | fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = scsiback_tpg_attrs; | |
2019 | fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL; | |
2020 | fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = scsiback_param_attrs; | |
2021 | fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL; | |
2022 | fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL; | |
2023 | fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL; | |
2024 | fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL; | |
2025 | fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL; | |
2026 | /* | |
2027 | * Register the fabric for use within TCM | |
2028 | */ | |
2029 | ret = target_fabric_configfs_register(fabric); | |
2030 | if (ret < 0) { | |
2031 | target_fabric_configfs_free(fabric); | |
2032 | return ret; | |
2033 | } | |
2034 | /* | |
2035 | * Setup our local pointer to *fabric | |
2036 | */ | |
2037 | scsiback_fabric_configfs = fabric; | |
78574878 | 2038 | pr_debug("Set fabric -> scsiback_fabric_configfs\n"); |
d9d660f6 JG |
2039 | return 0; |
2040 | }; | |
2041 | ||
2042 | static void scsiback_deregister_configfs(void) | |
2043 | { | |
2044 | if (!scsiback_fabric_configfs) | |
2045 | return; | |
2046 | ||
2047 | target_fabric_configfs_deregister(scsiback_fabric_configfs); | |
2048 | scsiback_fabric_configfs = NULL; | |
78574878 | 2049 | pr_debug("Cleared scsiback_fabric_configfs\n"); |
d9d660f6 JG |
2050 | }; |
2051 | ||
2052 | static const struct xenbus_device_id scsiback_ids[] = { | |
2053 | { "vscsi" }, | |
2054 | { "" } | |
2055 | }; | |
2056 | ||
95afae48 DV |
2057 | static struct xenbus_driver scsiback_driver = { |
2058 | .ids = scsiback_ids, | |
d9d660f6 JG |
2059 | .probe = scsiback_probe, |
2060 | .remove = scsiback_remove, | |
2061 | .otherend_changed = scsiback_frontend_changed | |
95afae48 | 2062 | }; |
d9d660f6 JG |
2063 | |
2064 | static void scsiback_init_pend(void *p) | |
2065 | { | |
2066 | struct vscsibk_pend *pend = p; | |
2067 | int i; | |
2068 | ||
2069 | memset(pend, 0, sizeof(*pend)); | |
2070 | for (i = 0; i < VSCSI_MAX_GRANTS; i++) | |
2071 | pend->grant_handles[i] = SCSIBACK_INVALID_HANDLE; | |
2072 | } | |
2073 | ||
2074 | static int __init scsiback_init(void) | |
2075 | { | |
2076 | int ret; | |
2077 | ||
2078 | if (!xen_domain()) | |
2079 | return -ENODEV; | |
2080 | ||
2081 | scsiback_cachep = kmem_cache_create("vscsiif_cache", | |
2082 | sizeof(struct vscsibk_pend), 0, 0, scsiback_init_pend); | |
2083 | if (!scsiback_cachep) | |
2084 | return -ENOMEM; | |
2085 | ||
2086 | ret = xenbus_register_backend(&scsiback_driver); | |
2087 | if (ret) | |
2088 | goto out_cache_destroy; | |
2089 | ||
2090 | ret = scsiback_register_configfs(); | |
2091 | if (ret) | |
2092 | goto out_unregister_xenbus; | |
2093 | ||
2094 | return 0; | |
2095 | ||
2096 | out_unregister_xenbus: | |
2097 | xenbus_unregister_driver(&scsiback_driver); | |
2098 | out_cache_destroy: | |
2099 | kmem_cache_destroy(scsiback_cachep); | |
78574878 | 2100 | pr_err("%s: error %d\n", __func__, ret); |
d9d660f6 JG |
2101 | return ret; |
2102 | } | |
2103 | ||
2104 | static void __exit scsiback_exit(void) | |
2105 | { | |
2106 | struct page *page; | |
2107 | ||
2108 | while (free_pages_num) { | |
2109 | if (get_free_page(&page)) | |
2110 | BUG(); | |
ff4b156f | 2111 | gnttab_free_pages(1, &page); |
d9d660f6 JG |
2112 | } |
2113 | scsiback_deregister_configfs(); | |
2114 | xenbus_unregister_driver(&scsiback_driver); | |
2115 | kmem_cache_destroy(scsiback_cachep); | |
2116 | } | |
2117 | ||
2118 | module_init(scsiback_init); | |
2119 | module_exit(scsiback_exit); | |
2120 | ||
2121 | MODULE_DESCRIPTION("Xen SCSI backend driver"); | |
2122 | MODULE_LICENSE("Dual BSD/GPL"); | |
2123 | MODULE_ALIAS("xen-backend:vscsi"); | |
2124 | MODULE_AUTHOR("Juergen Gross <jgross@suse.com>"); |