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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 | ||
ba929992 | 52 | #include <scsi/scsi_host.h> /* SG_ALL */ |
d9d660f6 JG |
53 | |
54 | #include <target/target_core_base.h> | |
55 | #include <target/target_core_fabric.h> | |
d9d660f6 JG |
56 | |
57 | #include <asm/hypervisor.h> | |
58 | ||
59 | #include <xen/xen.h> | |
60 | #include <xen/balloon.h> | |
61 | #include <xen/events.h> | |
62 | #include <xen/xenbus.h> | |
63 | #include <xen/grant_table.h> | |
64 | #include <xen/page.h> | |
65 | ||
66 | #include <xen/interface/grant_table.h> | |
67 | #include <xen/interface/io/vscsiif.h> | |
68 | ||
d9d660f6 JG |
69 | #define VSCSI_VERSION "v0.1" |
70 | #define VSCSI_NAMELEN 32 | |
71 | ||
72 | struct ids_tuple { | |
73 | unsigned int hst; /* host */ | |
74 | unsigned int chn; /* channel */ | |
75 | unsigned int tgt; /* target */ | |
76 | unsigned int lun; /* LUN */ | |
77 | }; | |
78 | ||
79 | struct v2p_entry { | |
80 | struct ids_tuple v; /* translate from */ | |
81 | struct scsiback_tpg *tpg; /* translate to */ | |
82 | unsigned int lun; | |
83 | struct kref kref; | |
84 | struct list_head l; | |
85 | }; | |
86 | ||
87 | struct vscsibk_info { | |
88 | struct xenbus_device *dev; | |
89 | ||
90 | domid_t domid; | |
91 | unsigned int irq; | |
92 | ||
93 | struct vscsiif_back_ring ring; | |
94 | int ring_error; | |
95 | ||
96 | spinlock_t ring_lock; | |
97 | atomic_t nr_unreplied_reqs; | |
98 | ||
99 | spinlock_t v2p_lock; | |
100 | struct list_head v2p_entry_lists; | |
101 | ||
102 | wait_queue_head_t waiting_to_free; | |
103 | }; | |
104 | ||
105 | /* theoretical maximum of grants for one request */ | |
106 | #define VSCSI_MAX_GRANTS (SG_ALL + VSCSIIF_SG_TABLESIZE) | |
107 | ||
108 | /* | |
109 | * VSCSI_GRANT_BATCH is the maximum number of grants to be processed in one | |
110 | * call to map/unmap grants. Don't choose it too large, as there are arrays | |
111 | * with VSCSI_GRANT_BATCH elements allocated on the stack. | |
112 | */ | |
113 | #define VSCSI_GRANT_BATCH 16 | |
114 | ||
115 | struct vscsibk_pend { | |
116 | uint16_t rqid; | |
117 | ||
118 | uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE]; | |
119 | uint8_t cmd_len; | |
120 | ||
121 | uint8_t sc_data_direction; | |
122 | uint16_t n_sg; /* real length of SG list */ | |
123 | uint16_t n_grants; /* SG pages and potentially SG list */ | |
124 | uint32_t data_len; | |
125 | uint32_t result; | |
126 | ||
127 | struct vscsibk_info *info; | |
128 | struct v2p_entry *v2p; | |
129 | struct scatterlist *sgl; | |
130 | ||
131 | uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE]; | |
132 | ||
133 | grant_handle_t grant_handles[VSCSI_MAX_GRANTS]; | |
134 | struct page *pages[VSCSI_MAX_GRANTS]; | |
135 | ||
136 | struct se_cmd se_cmd; | |
d9d660f6 | 137 | |
e3eac124 | 138 | struct completion tmr_done; |
d9d660f6 JG |
139 | }; |
140 | ||
2dbcdf33 NB |
141 | #define VSCSI_DEFAULT_SESSION_TAGS 128 |
142 | ||
d9d660f6 JG |
143 | struct scsiback_nexus { |
144 | /* Pointer to TCM session for I_T Nexus */ | |
145 | struct se_session *tvn_se_sess; | |
146 | }; | |
147 | ||
148 | struct scsiback_tport { | |
149 | /* SCSI protocol the tport is providing */ | |
150 | u8 tport_proto_id; | |
151 | /* Binary World Wide unique Port Name for pvscsi Target port */ | |
152 | u64 tport_wwpn; | |
153 | /* ASCII formatted WWPN for pvscsi Target port */ | |
154 | char tport_name[VSCSI_NAMELEN]; | |
155 | /* Returned by scsiback_make_tport() */ | |
156 | struct se_wwn tport_wwn; | |
157 | }; | |
158 | ||
159 | struct scsiback_tpg { | |
160 | /* scsiback port target portal group tag for TCM */ | |
161 | u16 tport_tpgt; | |
162 | /* track number of TPG Port/Lun Links wrt explicit I_T Nexus shutdown */ | |
163 | int tv_tpg_port_count; | |
164 | /* xen-pvscsi references to tpg_nexus, protected by tv_tpg_mutex */ | |
165 | int tv_tpg_fe_count; | |
166 | /* list for scsiback_list */ | |
167 | struct list_head tv_tpg_list; | |
168 | /* Used to protect access for tpg_nexus */ | |
169 | struct mutex tv_tpg_mutex; | |
170 | /* Pointer to the TCM pvscsi I_T Nexus for this TPG endpoint */ | |
171 | struct scsiback_nexus *tpg_nexus; | |
172 | /* Pointer back to scsiback_tport */ | |
173 | struct scsiback_tport *tport; | |
174 | /* Returned by scsiback_make_tpg() */ | |
175 | struct se_portal_group se_tpg; | |
176 | /* alias used in xenstore */ | |
177 | char param_alias[VSCSI_NAMELEN]; | |
178 | /* list of info structures related to this target portal group */ | |
179 | struct list_head info_list; | |
180 | }; | |
181 | ||
182 | #define SCSIBACK_INVALID_HANDLE (~0) | |
183 | ||
184 | static bool log_print_stat; | |
185 | module_param(log_print_stat, bool, 0644); | |
186 | ||
187 | static int scsiback_max_buffer_pages = 1024; | |
188 | module_param_named(max_buffer_pages, scsiback_max_buffer_pages, int, 0644); | |
189 | MODULE_PARM_DESC(max_buffer_pages, | |
190 | "Maximum number of free pages to keep in backend buffer"); | |
191 | ||
d9d660f6 JG |
192 | static DEFINE_SPINLOCK(free_pages_lock); |
193 | static int free_pages_num; | |
194 | static LIST_HEAD(scsiback_free_pages); | |
195 | ||
196 | /* Global spinlock to protect scsiback TPG list */ | |
197 | static DEFINE_MUTEX(scsiback_mutex); | |
198 | static LIST_HEAD(scsiback_list); | |
199 | ||
d9d660f6 JG |
200 | static void scsiback_get(struct vscsibk_info *info) |
201 | { | |
202 | atomic_inc(&info->nr_unreplied_reqs); | |
203 | } | |
204 | ||
205 | static void scsiback_put(struct vscsibk_info *info) | |
206 | { | |
207 | if (atomic_dec_and_test(&info->nr_unreplied_reqs)) | |
208 | wake_up(&info->waiting_to_free); | |
209 | } | |
210 | ||
211 | static void put_free_pages(struct page **page, int num) | |
212 | { | |
213 | unsigned long flags; | |
214 | int i = free_pages_num + num, n = num; | |
215 | ||
216 | if (num == 0) | |
217 | return; | |
218 | if (i > scsiback_max_buffer_pages) { | |
219 | n = min(num, i - scsiback_max_buffer_pages); | |
ff4b156f | 220 | gnttab_free_pages(n, page + num - n); |
d9d660f6 JG |
221 | n = num - n; |
222 | } | |
223 | spin_lock_irqsave(&free_pages_lock, flags); | |
224 | for (i = 0; i < n; i++) | |
225 | list_add(&page[i]->lru, &scsiback_free_pages); | |
226 | free_pages_num += n; | |
227 | spin_unlock_irqrestore(&free_pages_lock, flags); | |
228 | } | |
229 | ||
230 | static int get_free_page(struct page **page) | |
231 | { | |
232 | unsigned long flags; | |
233 | ||
234 | spin_lock_irqsave(&free_pages_lock, flags); | |
235 | if (list_empty(&scsiback_free_pages)) { | |
236 | spin_unlock_irqrestore(&free_pages_lock, flags); | |
ff4b156f | 237 | return gnttab_alloc_pages(1, page); |
d9d660f6 JG |
238 | } |
239 | page[0] = list_first_entry(&scsiback_free_pages, struct page, lru); | |
240 | list_del(&page[0]->lru); | |
241 | free_pages_num--; | |
242 | spin_unlock_irqrestore(&free_pages_lock, flags); | |
243 | return 0; | |
244 | } | |
245 | ||
246 | static unsigned long vaddr_page(struct page *page) | |
247 | { | |
248 | unsigned long pfn = page_to_pfn(page); | |
249 | ||
250 | return (unsigned long)pfn_to_kaddr(pfn); | |
251 | } | |
252 | ||
253 | static unsigned long vaddr(struct vscsibk_pend *req, int seg) | |
254 | { | |
255 | return vaddr_page(req->pages[seg]); | |
256 | } | |
257 | ||
258 | static void scsiback_print_status(char *sense_buffer, int errors, | |
259 | struct vscsibk_pend *pending_req) | |
260 | { | |
261 | struct scsiback_tpg *tpg = pending_req->v2p->tpg; | |
262 | ||
78574878 | 263 | pr_err("[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n", |
d9d660f6 JG |
264 | tpg->tport->tport_name, pending_req->v2p->lun, |
265 | pending_req->cmnd[0], status_byte(errors), msg_byte(errors), | |
266 | host_byte(errors), driver_byte(errors)); | |
d9d660f6 JG |
267 | } |
268 | ||
269 | static void scsiback_fast_flush_area(struct vscsibk_pend *req) | |
270 | { | |
271 | struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH]; | |
272 | struct page *pages[VSCSI_GRANT_BATCH]; | |
273 | unsigned int i, invcount = 0; | |
274 | grant_handle_t handle; | |
275 | int err; | |
276 | ||
277 | kfree(req->sgl); | |
278 | req->sgl = NULL; | |
279 | req->n_sg = 0; | |
280 | ||
281 | if (!req->n_grants) | |
282 | return; | |
283 | ||
284 | for (i = 0; i < req->n_grants; i++) { | |
285 | handle = req->grant_handles[i]; | |
286 | if (handle == SCSIBACK_INVALID_HANDLE) | |
287 | continue; | |
288 | gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i), | |
289 | GNTMAP_host_map, handle); | |
290 | req->grant_handles[i] = SCSIBACK_INVALID_HANDLE; | |
291 | pages[invcount] = req->pages[i]; | |
292 | put_page(pages[invcount]); | |
293 | invcount++; | |
294 | if (invcount < VSCSI_GRANT_BATCH) | |
295 | continue; | |
296 | err = gnttab_unmap_refs(unmap, NULL, pages, invcount); | |
297 | BUG_ON(err); | |
298 | invcount = 0; | |
299 | } | |
300 | ||
301 | if (invcount) { | |
302 | err = gnttab_unmap_refs(unmap, NULL, pages, invcount); | |
303 | BUG_ON(err); | |
304 | } | |
305 | ||
306 | put_free_pages(req->pages, req->n_grants); | |
307 | req->n_grants = 0; | |
308 | } | |
309 | ||
310 | static void scsiback_free_translation_entry(struct kref *kref) | |
311 | { | |
312 | struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref); | |
313 | struct scsiback_tpg *tpg = entry->tpg; | |
314 | ||
315 | mutex_lock(&tpg->tv_tpg_mutex); | |
316 | tpg->tv_tpg_fe_count--; | |
317 | mutex_unlock(&tpg->tv_tpg_mutex); | |
318 | ||
319 | kfree(entry); | |
320 | } | |
321 | ||
2dbcdf33 NB |
322 | static void scsiback_send_response(struct vscsibk_info *info, |
323 | char *sense_buffer, int32_t result, uint32_t resid, | |
324 | uint16_t rqid) | |
d9d660f6 JG |
325 | { |
326 | struct vscsiif_response *ring_res; | |
d9d660f6 JG |
327 | int notify; |
328 | struct scsi_sense_hdr sshdr; | |
329 | unsigned long flags; | |
330 | unsigned len; | |
331 | ||
332 | spin_lock_irqsave(&info->ring_lock, flags); | |
333 | ||
334 | ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt); | |
335 | info->ring.rsp_prod_pvt++; | |
336 | ||
337 | ring_res->rslt = result; | |
2dbcdf33 | 338 | ring_res->rqid = rqid; |
d9d660f6 JG |
339 | |
340 | if (sense_buffer != NULL && | |
341 | scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE, | |
342 | &sshdr)) { | |
343 | len = min_t(unsigned, 8 + sense_buffer[7], | |
344 | VSCSIIF_SENSE_BUFFERSIZE); | |
345 | memcpy(ring_res->sense_buffer, sense_buffer, len); | |
346 | ring_res->sense_len = len; | |
347 | } else { | |
348 | ring_res->sense_len = 0; | |
349 | } | |
350 | ||
351 | ring_res->residual_len = resid; | |
352 | ||
353 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify); | |
354 | spin_unlock_irqrestore(&info->ring_lock, flags); | |
355 | ||
356 | if (notify) | |
357 | notify_remote_via_irq(info->irq); | |
2dbcdf33 NB |
358 | } |
359 | ||
360 | static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result, | |
361 | uint32_t resid, struct vscsibk_pend *pending_req) | |
362 | { | |
363 | scsiback_send_response(pending_req->info, sense_buffer, result, | |
364 | resid, pending_req->rqid); | |
d9d660f6 JG |
365 | |
366 | if (pending_req->v2p) | |
367 | kref_put(&pending_req->v2p->kref, | |
368 | scsiback_free_translation_entry); | |
369 | } | |
370 | ||
371 | static void scsiback_cmd_done(struct vscsibk_pend *pending_req) | |
372 | { | |
373 | struct vscsibk_info *info = pending_req->info; | |
374 | unsigned char *sense_buffer; | |
375 | unsigned int resid; | |
376 | int errors; | |
377 | ||
378 | sense_buffer = pending_req->sense_buffer; | |
379 | resid = pending_req->se_cmd.residual_count; | |
380 | errors = pending_req->result; | |
381 | ||
382 | if (errors && log_print_stat) | |
383 | scsiback_print_status(sense_buffer, errors, pending_req); | |
384 | ||
385 | scsiback_fast_flush_area(pending_req); | |
386 | scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req); | |
387 | scsiback_put(info); | |
fa22e7b7 NB |
388 | /* |
389 | * Drop the extra KREF_ACK reference taken by target_submit_cmd_map_sgls() | |
390 | * ahead of scsiback_check_stop_free() -> transport_generic_free_cmd() | |
391 | * final se_cmd->cmd_kref put. | |
392 | */ | |
393 | target_put_sess_cmd(&pending_req->se_cmd); | |
d9d660f6 JG |
394 | } |
395 | ||
396 | static void scsiback_cmd_exec(struct vscsibk_pend *pending_req) | |
397 | { | |
398 | struct se_cmd *se_cmd = &pending_req->se_cmd; | |
399 | struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess; | |
400 | int rc; | |
401 | ||
d9d660f6 | 402 | scsiback_get(pending_req->info); |
649ee054 | 403 | se_cmd->tag = pending_req->rqid; |
d9d660f6 JG |
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, | |
fa22e7b7 | 407 | pending_req->sc_data_direction, TARGET_SCF_ACK_KREF, |
d9d660f6 JG |
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 | { | |
d9d660f6 | 596 | struct scsiback_tpg *tpg = pending_req->v2p->tpg; |
fa22e7b7 | 597 | struct scsiback_nexus *nexus = tpg->tpg_nexus; |
d9d660f6 | 598 | struct se_cmd *se_cmd = &pending_req->se_cmd; |
fa22e7b7 NB |
599 | u64 unpacked_lun = pending_req->v2p->lun; |
600 | int rc, err = FAILED; | |
d9d660f6 | 601 | |
e3eac124 | 602 | init_completion(&pending_req->tmr_done); |
d9d660f6 | 603 | |
fa22e7b7 NB |
604 | rc = target_submit_tmr(&pending_req->se_cmd, nexus->tvn_se_sess, |
605 | &pending_req->sense_buffer[0], | |
9f4ab18a | 606 | unpacked_lun, NULL, act, GFP_KERNEL, |
fa22e7b7 NB |
607 | tag, TARGET_SCF_ACK_KREF); |
608 | if (rc) | |
609 | goto err; | |
d9d660f6 | 610 | |
e3eac124 | 611 | wait_for_completion(&pending_req->tmr_done); |
d9d660f6 JG |
612 | |
613 | err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? | |
614 | SUCCESS : FAILED; | |
615 | ||
2dbcdf33 | 616 | scsiback_do_resp_with_sense(NULL, err, 0, pending_req); |
af90e84d | 617 | transport_generic_free_cmd(&pending_req->se_cmd, 0); |
2dbcdf33 | 618 | return; |
9f4ab18a | 619 | |
fa22e7b7 | 620 | err: |
d9d660f6 | 621 | scsiback_do_resp_with_sense(NULL, err, 0, pending_req); |
d9d660f6 JG |
622 | } |
623 | ||
624 | /* | |
625 | Perform virtual to physical translation | |
626 | */ | |
627 | static struct v2p_entry *scsiback_do_translation(struct vscsibk_info *info, | |
628 | struct ids_tuple *v) | |
629 | { | |
630 | struct v2p_entry *entry; | |
631 | struct list_head *head = &(info->v2p_entry_lists); | |
632 | unsigned long flags; | |
633 | ||
634 | spin_lock_irqsave(&info->v2p_lock, flags); | |
635 | list_for_each_entry(entry, head, l) { | |
636 | if ((entry->v.chn == v->chn) && | |
637 | (entry->v.tgt == v->tgt) && | |
638 | (entry->v.lun == v->lun)) { | |
639 | kref_get(&entry->kref); | |
640 | goto out; | |
641 | } | |
642 | } | |
643 | entry = NULL; | |
644 | ||
645 | out: | |
646 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
647 | return entry; | |
648 | } | |
649 | ||
2dbcdf33 NB |
650 | static struct vscsibk_pend *scsiback_get_pend_req(struct vscsiif_back_ring *ring, |
651 | struct v2p_entry *v2p) | |
652 | { | |
653 | struct scsiback_tpg *tpg = v2p->tpg; | |
654 | struct scsiback_nexus *nexus = tpg->tpg_nexus; | |
655 | struct se_session *se_sess = nexus->tvn_se_sess; | |
656 | struct vscsibk_pend *req; | |
10e9cbb6 | 657 | int tag, cpu, i; |
2dbcdf33 | 658 | |
10e9cbb6 | 659 | tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); |
2dbcdf33 NB |
660 | if (tag < 0) { |
661 | pr_err("Unable to obtain tag for vscsiif_request\n"); | |
662 | return ERR_PTR(-ENOMEM); | |
663 | } | |
664 | ||
665 | req = &((struct vscsibk_pend *)se_sess->sess_cmd_map)[tag]; | |
666 | memset(req, 0, sizeof(*req)); | |
667 | req->se_cmd.map_tag = tag; | |
10e9cbb6 | 668 | req->se_cmd.map_cpu = cpu; |
2dbcdf33 NB |
669 | |
670 | for (i = 0; i < VSCSI_MAX_GRANTS; i++) | |
671 | req->grant_handles[i] = SCSIBACK_INVALID_HANDLE; | |
672 | ||
673 | return req; | |
674 | } | |
675 | ||
676 | static struct vscsibk_pend *prepare_pending_reqs(struct vscsibk_info *info, | |
677 | struct vscsiif_back_ring *ring, | |
678 | struct vscsiif_request *ring_req) | |
d9d660f6 | 679 | { |
2dbcdf33 | 680 | struct vscsibk_pend *pending_req; |
d9d660f6 JG |
681 | struct v2p_entry *v2p; |
682 | struct ids_tuple vir; | |
683 | ||
2dbcdf33 NB |
684 | /* request range check from frontend */ |
685 | if ((ring_req->sc_data_direction != DMA_BIDIRECTIONAL) && | |
686 | (ring_req->sc_data_direction != DMA_TO_DEVICE) && | |
687 | (ring_req->sc_data_direction != DMA_FROM_DEVICE) && | |
688 | (ring_req->sc_data_direction != DMA_NONE)) { | |
689 | pr_debug("invalid parameter data_dir = %d\n", | |
690 | ring_req->sc_data_direction); | |
691 | return ERR_PTR(-EINVAL); | |
692 | } | |
693 | if (ring_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) { | |
694 | pr_debug("invalid parameter cmd_len = %d\n", | |
695 | ring_req->cmd_len); | |
696 | return ERR_PTR(-EINVAL); | |
697 | } | |
d9d660f6 JG |
698 | |
699 | vir.chn = ring_req->channel; | |
700 | vir.tgt = ring_req->id; | |
701 | vir.lun = ring_req->lun; | |
702 | ||
703 | v2p = scsiback_do_translation(info, &vir); | |
704 | if (!v2p) { | |
78574878 | 705 | pr_debug("the v2p of (chn:%d, tgt:%d, lun:%d) doesn't exist.\n", |
2dbcdf33 NB |
706 | vir.chn, vir.tgt, vir.lun); |
707 | return ERR_PTR(-ENODEV); | |
d9d660f6 | 708 | } |
d9d660f6 | 709 | |
2dbcdf33 NB |
710 | pending_req = scsiback_get_pend_req(ring, v2p); |
711 | if (IS_ERR(pending_req)) { | |
712 | kref_put(&v2p->kref, scsiback_free_translation_entry); | |
713 | return ERR_PTR(-ENOMEM); | |
d9d660f6 | 714 | } |
2dbcdf33 NB |
715 | pending_req->rqid = ring_req->rqid; |
716 | pending_req->info = info; | |
717 | pending_req->v2p = v2p; | |
718 | pending_req->sc_data_direction = ring_req->sc_data_direction; | |
d9d660f6 | 719 | pending_req->cmd_len = ring_req->cmd_len; |
d9d660f6 JG |
720 | memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len); |
721 | ||
2dbcdf33 | 722 | return pending_req; |
d9d660f6 JG |
723 | } |
724 | ||
725 | static int scsiback_do_cmd_fn(struct vscsibk_info *info) | |
726 | { | |
727 | struct vscsiif_back_ring *ring = &info->ring; | |
facb5732 | 728 | struct vscsiif_request ring_req; |
d9d660f6 JG |
729 | struct vscsibk_pend *pending_req; |
730 | RING_IDX rc, rp; | |
2dbcdf33 | 731 | int more_to_do; |
d9d660f6 | 732 | uint32_t result; |
d9d660f6 JG |
733 | |
734 | rc = ring->req_cons; | |
735 | rp = ring->sring->req_prod; | |
736 | rmb(); /* guest system is accessing ring, too */ | |
737 | ||
738 | if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) { | |
739 | rc = ring->rsp_prod_pvt; | |
78574878 | 740 | pr_warn("Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n", |
d9d660f6 JG |
741 | info->domid, rp, rc, rp - rc); |
742 | info->ring_error = 1; | |
743 | return 0; | |
744 | } | |
745 | ||
746 | while ((rc != rp)) { | |
747 | if (RING_REQUEST_CONS_OVERFLOW(ring, rc)) | |
748 | break; | |
d9d660f6 | 749 | |
be69746e | 750 | RING_COPY_REQUEST(ring, rc, &ring_req); |
d9d660f6 JG |
751 | ring->req_cons = ++rc; |
752 | ||
2dbcdf33 NB |
753 | pending_req = prepare_pending_reqs(info, ring, &ring_req); |
754 | if (IS_ERR(pending_req)) { | |
755 | switch (PTR_ERR(pending_req)) { | |
d9d660f6 JG |
756 | case -ENODEV: |
757 | result = DID_NO_CONNECT; | |
758 | break; | |
759 | default: | |
760 | result = DRIVER_ERROR; | |
761 | break; | |
762 | } | |
2dbcdf33 NB |
763 | scsiback_send_response(info, NULL, result << 24, 0, |
764 | ring_req.rqid); | |
d9d660f6 JG |
765 | return 1; |
766 | } | |
767 | ||
facb5732 | 768 | switch (ring_req.act) { |
d9d660f6 | 769 | case VSCSIIF_ACT_SCSI_CDB: |
facb5732 | 770 | if (scsiback_gnttab_data_map(&ring_req, pending_req)) { |
d9d660f6 JG |
771 | scsiback_fast_flush_area(pending_req); |
772 | scsiback_do_resp_with_sense(NULL, | |
2dbcdf33 NB |
773 | DRIVER_ERROR << 24, 0, pending_req); |
774 | transport_generic_free_cmd(&pending_req->se_cmd, 0); | |
d9d660f6 JG |
775 | } else { |
776 | scsiback_cmd_exec(pending_req); | |
777 | } | |
778 | break; | |
779 | case VSCSIIF_ACT_SCSI_ABORT: | |
780 | scsiback_device_action(pending_req, TMR_ABORT_TASK, | |
facb5732 | 781 | ring_req.ref_rqid); |
d9d660f6 JG |
782 | break; |
783 | case VSCSIIF_ACT_SCSI_RESET: | |
784 | scsiback_device_action(pending_req, TMR_LUN_RESET, 0); | |
785 | break; | |
786 | default: | |
78574878 | 787 | pr_err_ratelimited("invalid request\n"); |
2dbcdf33 NB |
788 | scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24, 0, |
789 | pending_req); | |
790 | transport_generic_free_cmd(&pending_req->se_cmd, 0); | |
d9d660f6 JG |
791 | break; |
792 | } | |
793 | ||
794 | /* Yield point for this unbounded loop. */ | |
795 | cond_resched(); | |
796 | } | |
797 | ||
798 | RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do); | |
799 | return more_to_do; | |
800 | } | |
801 | ||
802 | static irqreturn_t scsiback_irq_fn(int irq, void *dev_id) | |
803 | { | |
804 | struct vscsibk_info *info = dev_id; | |
805 | ||
806 | if (info->ring_error) | |
807 | return IRQ_HANDLED; | |
808 | ||
809 | while (scsiback_do_cmd_fn(info)) | |
810 | cond_resched(); | |
811 | ||
812 | return IRQ_HANDLED; | |
813 | } | |
814 | ||
815 | static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref, | |
816 | evtchn_port_t evtchn) | |
817 | { | |
818 | void *area; | |
819 | struct vscsiif_sring *sring; | |
820 | int err; | |
821 | ||
822 | if (info->irq) | |
823 | return -1; | |
824 | ||
ccc9d90a | 825 | err = xenbus_map_ring_valloc(info->dev, &ring_ref, 1, &area); |
d9d660f6 JG |
826 | if (err) |
827 | return err; | |
828 | ||
829 | sring = (struct vscsiif_sring *)area; | |
830 | BACK_RING_INIT(&info->ring, sring, PAGE_SIZE); | |
831 | ||
832 | err = bind_interdomain_evtchn_to_irq(info->domid, evtchn); | |
833 | if (err < 0) | |
834 | goto unmap_page; | |
835 | ||
836 | info->irq = err; | |
837 | ||
838 | err = request_threaded_irq(info->irq, NULL, scsiback_irq_fn, | |
839 | IRQF_ONESHOT, "vscsiif-backend", info); | |
840 | if (err) | |
841 | goto free_irq; | |
842 | ||
843 | return 0; | |
844 | ||
845 | free_irq: | |
846 | unbind_from_irqhandler(info->irq, info); | |
847 | info->irq = 0; | |
848 | unmap_page: | |
849 | xenbus_unmap_ring_vfree(info->dev, area); | |
850 | ||
851 | return err; | |
852 | } | |
853 | ||
854 | static int scsiback_map(struct vscsibk_info *info) | |
855 | { | |
856 | struct xenbus_device *dev = info->dev; | |
857 | unsigned int ring_ref, evtchn; | |
858 | int err; | |
859 | ||
860 | err = xenbus_gather(XBT_NIL, dev->otherend, | |
861 | "ring-ref", "%u", &ring_ref, | |
862 | "event-channel", "%u", &evtchn, NULL); | |
863 | if (err) { | |
864 | xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend); | |
865 | return err; | |
866 | } | |
867 | ||
868 | return scsiback_init_sring(info, ring_ref, evtchn); | |
869 | } | |
870 | ||
c9e2f531 JG |
871 | /* |
872 | Check for a translation entry being present | |
873 | */ | |
874 | static struct v2p_entry *scsiback_chk_translation_entry( | |
875 | struct vscsibk_info *info, struct ids_tuple *v) | |
876 | { | |
877 | struct list_head *head = &(info->v2p_entry_lists); | |
878 | struct v2p_entry *entry; | |
879 | ||
880 | list_for_each_entry(entry, head, l) | |
881 | if ((entry->v.chn == v->chn) && | |
882 | (entry->v.tgt == v->tgt) && | |
883 | (entry->v.lun == v->lun)) | |
884 | return entry; | |
885 | ||
886 | return NULL; | |
887 | } | |
888 | ||
d9d660f6 JG |
889 | /* |
890 | Add a new translation entry | |
891 | */ | |
892 | static int scsiback_add_translation_entry(struct vscsibk_info *info, | |
893 | char *phy, struct ids_tuple *v) | |
894 | { | |
895 | int err = 0; | |
d9d660f6 | 896 | struct v2p_entry *new; |
d9d660f6 JG |
897 | unsigned long flags; |
898 | char *lunp; | |
196e2e2a | 899 | unsigned long long unpacked_lun; |
6bb82612 | 900 | struct se_lun *se_lun; |
d9d660f6 JG |
901 | struct scsiback_tpg *tpg_entry, *tpg = NULL; |
902 | char *error = "doesn't exist"; | |
903 | ||
904 | lunp = strrchr(phy, ':'); | |
905 | if (!lunp) { | |
78574878 | 906 | pr_err("illegal format of physical device %s\n", phy); |
d9d660f6 JG |
907 | return -EINVAL; |
908 | } | |
909 | *lunp = 0; | |
910 | lunp++; | |
196e2e2a HR |
911 | err = kstrtoull(lunp, 10, &unpacked_lun); |
912 | if (err < 0) { | |
78574878 | 913 | pr_err("lun number not valid: %s\n", lunp); |
196e2e2a | 914 | return err; |
d9d660f6 JG |
915 | } |
916 | ||
917 | mutex_lock(&scsiback_mutex); | |
918 | list_for_each_entry(tpg_entry, &scsiback_list, tv_tpg_list) { | |
919 | if (!strcmp(phy, tpg_entry->tport->tport_name) || | |
920 | !strcmp(phy, tpg_entry->param_alias)) { | |
6bb82612 NB |
921 | mutex_lock(&tpg_entry->se_tpg.tpg_lun_mutex); |
922 | hlist_for_each_entry(se_lun, &tpg_entry->se_tpg.tpg_lun_hlist, link) { | |
923 | if (se_lun->unpacked_lun == unpacked_lun) { | |
924 | if (!tpg_entry->tpg_nexus) | |
925 | error = "nexus undefined"; | |
926 | else | |
927 | tpg = tpg_entry; | |
928 | break; | |
929 | } | |
d9d660f6 | 930 | } |
6bb82612 | 931 | mutex_unlock(&tpg_entry->se_tpg.tpg_lun_mutex); |
d9d660f6 JG |
932 | break; |
933 | } | |
934 | } | |
935 | if (tpg) { | |
936 | mutex_lock(&tpg->tv_tpg_mutex); | |
937 | tpg->tv_tpg_fe_count++; | |
938 | mutex_unlock(&tpg->tv_tpg_mutex); | |
939 | } | |
940 | mutex_unlock(&scsiback_mutex); | |
941 | ||
942 | if (!tpg) { | |
0fb1f14e | 943 | pr_err("%s:%llu %s\n", phy, unpacked_lun, error); |
d9d660f6 JG |
944 | return -ENODEV; |
945 | } | |
946 | ||
947 | new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL); | |
948 | if (new == NULL) { | |
949 | err = -ENOMEM; | |
950 | goto out_free; | |
951 | } | |
952 | ||
953 | spin_lock_irqsave(&info->v2p_lock, flags); | |
954 | ||
955 | /* Check double assignment to identical virtual ID */ | |
c9e2f531 JG |
956 | if (scsiback_chk_translation_entry(info, v)) { |
957 | pr_warn("Virtual ID is already used. Assignment was not performed.\n"); | |
958 | err = -EEXIST; | |
959 | goto out; | |
d9d660f6 JG |
960 | } |
961 | ||
962 | /* Create a new translation entry and add to the list */ | |
963 | kref_init(&new->kref); | |
964 | new->v = *v; | |
965 | new->tpg = tpg; | |
6bb82612 | 966 | new->lun = unpacked_lun; |
c9e2f531 | 967 | list_add_tail(&new->l, &info->v2p_entry_lists); |
d9d660f6 JG |
968 | |
969 | out: | |
970 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
971 | ||
972 | out_free: | |
f285aa8d JG |
973 | if (err) { |
974 | mutex_lock(&tpg->tv_tpg_mutex); | |
975 | tpg->tv_tpg_fe_count--; | |
976 | mutex_unlock(&tpg->tv_tpg_mutex); | |
d9d660f6 | 977 | kfree(new); |
f285aa8d | 978 | } |
d9d660f6 JG |
979 | |
980 | return err; | |
981 | } | |
982 | ||
983 | static void __scsiback_del_translation_entry(struct v2p_entry *entry) | |
984 | { | |
985 | list_del(&entry->l); | |
986 | kref_put(&entry->kref, scsiback_free_translation_entry); | |
987 | } | |
988 | ||
989 | /* | |
c9e2f531 | 990 | Delete the translation entry specified |
d9d660f6 JG |
991 | */ |
992 | static int scsiback_del_translation_entry(struct vscsibk_info *info, | |
993 | struct ids_tuple *v) | |
994 | { | |
995 | struct v2p_entry *entry; | |
d9d660f6 | 996 | unsigned long flags; |
c9e2f531 | 997 | int ret = 0; |
d9d660f6 JG |
998 | |
999 | spin_lock_irqsave(&info->v2p_lock, flags); | |
1000 | /* Find out the translation entry specified */ | |
c9e2f531 JG |
1001 | entry = scsiback_chk_translation_entry(info, v); |
1002 | if (entry) | |
1003 | __scsiback_del_translation_entry(entry); | |
1004 | else | |
1005 | ret = -ENOENT; | |
d9d660f6 JG |
1006 | |
1007 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
c9e2f531 | 1008 | return ret; |
d9d660f6 JG |
1009 | } |
1010 | ||
1011 | static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state, | |
169e6cf0 | 1012 | char *phy, struct ids_tuple *vir, int try) |
d9d660f6 | 1013 | { |
c9e2f531 JG |
1014 | struct v2p_entry *entry; |
1015 | unsigned long flags; | |
7c63ca24 | 1016 | int err; |
c9e2f531 JG |
1017 | |
1018 | if (try) { | |
1019 | spin_lock_irqsave(&info->v2p_lock, flags); | |
1020 | entry = scsiback_chk_translation_entry(info, vir); | |
1021 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
1022 | if (entry) | |
1023 | return; | |
1024 | } | |
d9d660f6 JG |
1025 | if (!scsiback_add_translation_entry(info, phy, vir)) { |
1026 | if (xenbus_printf(XBT_NIL, info->dev->nodename, state, | |
1027 | "%d", XenbusStateInitialised)) { | |
78574878 | 1028 | pr_err("xenbus_printf error %s\n", state); |
d9d660f6 JG |
1029 | scsiback_del_translation_entry(info, vir); |
1030 | } | |
169e6cf0 | 1031 | } else if (!try) { |
7c63ca24 | 1032 | err = xenbus_printf(XBT_NIL, info->dev->nodename, state, |
d9d660f6 | 1033 | "%d", XenbusStateClosed); |
7c63ca24 ZJ |
1034 | if (err) |
1035 | xenbus_dev_error(info->dev, err, | |
1036 | "%s: writing %s", __func__, state); | |
d9d660f6 JG |
1037 | } |
1038 | } | |
1039 | ||
1040 | static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state, | |
1041 | struct ids_tuple *vir) | |
1042 | { | |
1043 | if (!scsiback_del_translation_entry(info, vir)) { | |
1044 | if (xenbus_printf(XBT_NIL, info->dev->nodename, state, | |
1045 | "%d", XenbusStateClosed)) | |
78574878 | 1046 | pr_err("xenbus_printf error %s\n", state); |
d9d660f6 JG |
1047 | } |
1048 | } | |
1049 | ||
1050 | #define VSCSIBACK_OP_ADD_OR_DEL_LUN 1 | |
1051 | #define VSCSIBACK_OP_UPDATEDEV_STATE 2 | |
1052 | ||
1053 | static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op, | |
1054 | char *ent) | |
1055 | { | |
1056 | int err; | |
1057 | struct ids_tuple vir; | |
1058 | char *val; | |
1059 | int device_state; | |
1060 | char phy[VSCSI_NAMELEN]; | |
1061 | char str[64]; | |
1062 | char state[64]; | |
1063 | struct xenbus_device *dev = info->dev; | |
1064 | ||
1065 | /* read status */ | |
1066 | snprintf(state, sizeof(state), "vscsi-devs/%s/state", ent); | |
1067 | err = xenbus_scanf(XBT_NIL, dev->nodename, state, "%u", &device_state); | |
1068 | if (XENBUS_EXIST_ERR(err)) | |
1069 | return; | |
1070 | ||
1071 | /* physical SCSI device */ | |
1072 | snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent); | |
1073 | val = xenbus_read(XBT_NIL, dev->nodename, str, NULL); | |
1074 | if (IS_ERR(val)) { | |
7c63ca24 | 1075 | err = xenbus_printf(XBT_NIL, dev->nodename, state, |
d9d660f6 | 1076 | "%d", XenbusStateClosed); |
7c63ca24 ZJ |
1077 | if (err) |
1078 | xenbus_dev_error(info->dev, err, | |
1079 | "%s: writing %s", __func__, state); | |
d9d660f6 JG |
1080 | return; |
1081 | } | |
1082 | strlcpy(phy, val, VSCSI_NAMELEN); | |
1083 | kfree(val); | |
1084 | ||
1085 | /* virtual SCSI device */ | |
1086 | snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", ent); | |
1087 | err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u", | |
1088 | &vir.hst, &vir.chn, &vir.tgt, &vir.lun); | |
1089 | if (XENBUS_EXIST_ERR(err)) { | |
7c63ca24 | 1090 | err = xenbus_printf(XBT_NIL, dev->nodename, state, |
d9d660f6 | 1091 | "%d", XenbusStateClosed); |
7c63ca24 ZJ |
1092 | if (err) |
1093 | xenbus_dev_error(info->dev, err, | |
1094 | "%s: writing %s", __func__, state); | |
d9d660f6 JG |
1095 | return; |
1096 | } | |
1097 | ||
1098 | switch (op) { | |
1099 | case VSCSIBACK_OP_ADD_OR_DEL_LUN: | |
169e6cf0 JG |
1100 | switch (device_state) { |
1101 | case XenbusStateInitialising: | |
1102 | scsiback_do_add_lun(info, state, phy, &vir, 0); | |
1103 | break; | |
1104 | case XenbusStateConnected: | |
1105 | scsiback_do_add_lun(info, state, phy, &vir, 1); | |
1106 | break; | |
1107 | case XenbusStateClosing: | |
d9d660f6 | 1108 | scsiback_do_del_lun(info, state, &vir); |
169e6cf0 JG |
1109 | break; |
1110 | default: | |
1111 | break; | |
1112 | } | |
d9d660f6 JG |
1113 | break; |
1114 | ||
1115 | case VSCSIBACK_OP_UPDATEDEV_STATE: | |
1116 | if (device_state == XenbusStateInitialised) { | |
1117 | /* modify vscsi-devs/dev-x/state */ | |
1118 | if (xenbus_printf(XBT_NIL, dev->nodename, state, | |
1119 | "%d", XenbusStateConnected)) { | |
78574878 | 1120 | pr_err("xenbus_printf error %s\n", str); |
d9d660f6 JG |
1121 | scsiback_del_translation_entry(info, &vir); |
1122 | xenbus_printf(XBT_NIL, dev->nodename, state, | |
1123 | "%d", XenbusStateClosed); | |
1124 | } | |
1125 | } | |
1126 | break; | |
78574878 | 1127 | /* When it is necessary, processing is added here. */ |
d9d660f6 JG |
1128 | default: |
1129 | break; | |
1130 | } | |
1131 | } | |
1132 | ||
1133 | static void scsiback_do_lun_hotplug(struct vscsibk_info *info, int op) | |
1134 | { | |
1135 | int i; | |
1136 | char **dir; | |
1137 | unsigned int ndir = 0; | |
1138 | ||
1139 | dir = xenbus_directory(XBT_NIL, info->dev->nodename, "vscsi-devs", | |
1140 | &ndir); | |
1141 | if (IS_ERR(dir)) | |
1142 | return; | |
1143 | ||
1144 | for (i = 0; i < ndir; i++) | |
1145 | scsiback_do_1lun_hotplug(info, op, dir[i]); | |
1146 | ||
1147 | kfree(dir); | |
1148 | } | |
1149 | ||
1150 | static void scsiback_frontend_changed(struct xenbus_device *dev, | |
1151 | enum xenbus_state frontend_state) | |
1152 | { | |
1153 | struct vscsibk_info *info = dev_get_drvdata(&dev->dev); | |
1154 | ||
1155 | switch (frontend_state) { | |
1156 | case XenbusStateInitialising: | |
1157 | break; | |
1158 | ||
1159 | case XenbusStateInitialised: | |
1160 | if (scsiback_map(info)) | |
1161 | break; | |
1162 | ||
1163 | scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); | |
1164 | xenbus_switch_state(dev, XenbusStateConnected); | |
1165 | break; | |
1166 | ||
1167 | case XenbusStateConnected: | |
1168 | scsiback_do_lun_hotplug(info, VSCSIBACK_OP_UPDATEDEV_STATE); | |
1169 | ||
1170 | if (dev->state == XenbusStateConnected) | |
1171 | break; | |
1172 | ||
1173 | xenbus_switch_state(dev, XenbusStateConnected); | |
1174 | break; | |
1175 | ||
1176 | case XenbusStateClosing: | |
1177 | if (info->irq) | |
1178 | scsiback_disconnect(info); | |
1179 | ||
1180 | xenbus_switch_state(dev, XenbusStateClosing); | |
1181 | break; | |
1182 | ||
1183 | case XenbusStateClosed: | |
1184 | xenbus_switch_state(dev, XenbusStateClosed); | |
1185 | if (xenbus_dev_is_online(dev)) | |
1186 | break; | |
efac6c75 | 1187 | /* fall through - if not online */ |
d9d660f6 JG |
1188 | case XenbusStateUnknown: |
1189 | device_unregister(&dev->dev); | |
1190 | break; | |
1191 | ||
1192 | case XenbusStateReconfiguring: | |
1193 | scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); | |
1194 | xenbus_switch_state(dev, XenbusStateReconfigured); | |
1195 | ||
1196 | break; | |
1197 | ||
1198 | default: | |
1199 | xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", | |
1200 | frontend_state); | |
1201 | break; | |
1202 | } | |
1203 | } | |
1204 | ||
1205 | /* | |
1206 | Release the translation entry specfied | |
1207 | */ | |
1208 | static void scsiback_release_translation_entry(struct vscsibk_info *info) | |
1209 | { | |
1210 | struct v2p_entry *entry, *tmp; | |
1211 | struct list_head *head = &(info->v2p_entry_lists); | |
1212 | unsigned long flags; | |
1213 | ||
1214 | spin_lock_irqsave(&info->v2p_lock, flags); | |
1215 | ||
1216 | list_for_each_entry_safe(entry, tmp, head, l) | |
1217 | __scsiback_del_translation_entry(entry); | |
1218 | ||
1219 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
1220 | } | |
1221 | ||
1222 | static int scsiback_remove(struct xenbus_device *dev) | |
1223 | { | |
1224 | struct vscsibk_info *info = dev_get_drvdata(&dev->dev); | |
1225 | ||
1226 | if (info->irq) | |
1227 | scsiback_disconnect(info); | |
1228 | ||
1229 | scsiback_release_translation_entry(info); | |
1230 | ||
1231 | dev_set_drvdata(&dev->dev, NULL); | |
1232 | ||
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | static int scsiback_probe(struct xenbus_device *dev, | |
1237 | const struct xenbus_device_id *id) | |
1238 | { | |
1239 | int err; | |
1240 | ||
1241 | struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info), | |
1242 | GFP_KERNEL); | |
1243 | ||
78574878 | 1244 | pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id); |
d9d660f6 JG |
1245 | |
1246 | if (!info) { | |
1247 | xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure"); | |
1248 | return -ENOMEM; | |
1249 | } | |
1250 | info->dev = dev; | |
1251 | dev_set_drvdata(&dev->dev, info); | |
1252 | ||
1253 | info->domid = dev->otherend_id; | |
1254 | spin_lock_init(&info->ring_lock); | |
1255 | info->ring_error = 0; | |
1256 | atomic_set(&info->nr_unreplied_reqs, 0); | |
1257 | init_waitqueue_head(&info->waiting_to_free); | |
1258 | info->dev = dev; | |
1259 | info->irq = 0; | |
1260 | INIT_LIST_HEAD(&info->v2p_entry_lists); | |
1261 | spin_lock_init(&info->v2p_lock); | |
1262 | ||
1263 | err = xenbus_printf(XBT_NIL, dev->nodename, "feature-sg-grant", "%u", | |
1264 | SG_ALL); | |
1265 | if (err) | |
1266 | xenbus_dev_error(dev, err, "writing feature-sg-grant"); | |
1267 | ||
1268 | err = xenbus_switch_state(dev, XenbusStateInitWait); | |
1269 | if (err) | |
1270 | goto fail; | |
1271 | ||
1272 | return 0; | |
1273 | ||
1274 | fail: | |
78574878 | 1275 | pr_warn("%s failed\n", __func__); |
d9d660f6 JG |
1276 | scsiback_remove(dev); |
1277 | ||
1278 | return err; | |
1279 | } | |
1280 | ||
1281 | static char *scsiback_dump_proto_id(struct scsiback_tport *tport) | |
1282 | { | |
1283 | switch (tport->tport_proto_id) { | |
1284 | case SCSI_PROTOCOL_SAS: | |
1285 | return "SAS"; | |
1286 | case SCSI_PROTOCOL_FCP: | |
1287 | return "FCP"; | |
1288 | case SCSI_PROTOCOL_ISCSI: | |
1289 | return "iSCSI"; | |
1290 | default: | |
1291 | break; | |
1292 | } | |
1293 | ||
1294 | return "Unknown"; | |
1295 | } | |
1296 | ||
d9d660f6 JG |
1297 | static char *scsiback_get_fabric_wwn(struct se_portal_group *se_tpg) |
1298 | { | |
1299 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1300 | struct scsiback_tpg, se_tpg); | |
1301 | struct scsiback_tport *tport = tpg->tport; | |
1302 | ||
1303 | return &tport->tport_name[0]; | |
1304 | } | |
1305 | ||
1306 | static u16 scsiback_get_tag(struct se_portal_group *se_tpg) | |
1307 | { | |
1308 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1309 | struct scsiback_tpg, se_tpg); | |
1310 | return tpg->tport_tpgt; | |
1311 | } | |
1312 | ||
d9d660f6 JG |
1313 | static struct se_wwn * |
1314 | scsiback_make_tport(struct target_fabric_configfs *tf, | |
1315 | struct config_group *group, | |
1316 | const char *name) | |
1317 | { | |
1318 | struct scsiback_tport *tport; | |
1319 | char *ptr; | |
1320 | u64 wwpn = 0; | |
1321 | int off = 0; | |
1322 | ||
1323 | tport = kzalloc(sizeof(struct scsiback_tport), GFP_KERNEL); | |
1324 | if (!tport) | |
1325 | return ERR_PTR(-ENOMEM); | |
1326 | ||
1327 | tport->tport_wwpn = wwpn; | |
1328 | /* | |
1329 | * Determine the emulated Protocol Identifier and Target Port Name | |
1330 | * based on the incoming configfs directory name. | |
1331 | */ | |
1332 | ptr = strstr(name, "naa."); | |
1333 | if (ptr) { | |
1334 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
1335 | goto check_len; | |
1336 | } | |
1337 | ptr = strstr(name, "fc."); | |
1338 | if (ptr) { | |
1339 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
1340 | off = 3; /* Skip over "fc." */ | |
1341 | goto check_len; | |
1342 | } | |
1343 | ptr = strstr(name, "iqn."); | |
1344 | if (ptr) { | |
1345 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
1346 | goto check_len; | |
1347 | } | |
1348 | ||
1349 | pr_err("Unable to locate prefix for emulated Target Port: %s\n", name); | |
1350 | kfree(tport); | |
1351 | return ERR_PTR(-EINVAL); | |
1352 | ||
1353 | check_len: | |
1354 | if (strlen(name) >= VSCSI_NAMELEN) { | |
1355 | pr_err("Emulated %s Address: %s, exceeds max: %d\n", name, | |
1356 | scsiback_dump_proto_id(tport), VSCSI_NAMELEN); | |
1357 | kfree(tport); | |
1358 | return ERR_PTR(-EINVAL); | |
1359 | } | |
1360 | snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]); | |
1361 | ||
78574878 | 1362 | pr_debug("Allocated emulated Target %s Address: %s\n", |
d9d660f6 JG |
1363 | scsiback_dump_proto_id(tport), name); |
1364 | ||
1365 | return &tport->tport_wwn; | |
1366 | } | |
1367 | ||
1368 | static void scsiback_drop_tport(struct se_wwn *wwn) | |
1369 | { | |
1370 | struct scsiback_tport *tport = container_of(wwn, | |
1371 | struct scsiback_tport, tport_wwn); | |
1372 | ||
78574878 | 1373 | pr_debug("Deallocating emulated Target %s Address: %s\n", |
d9d660f6 JG |
1374 | scsiback_dump_proto_id(tport), tport->tport_name); |
1375 | ||
1376 | kfree(tport); | |
1377 | } | |
1378 | ||
d9d660f6 JG |
1379 | static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg) |
1380 | { | |
1381 | return 1; | |
1382 | } | |
1383 | ||
1384 | static int scsiback_check_stop_free(struct se_cmd *se_cmd) | |
1385 | { | |
fa22e7b7 | 1386 | return transport_generic_free_cmd(se_cmd, 0); |
d9d660f6 JG |
1387 | } |
1388 | ||
1389 | static void scsiback_release_cmd(struct se_cmd *se_cmd) | |
1390 | { | |
83c2b54b | 1391 | target_free_tag(se_cmd->se_sess, se_cmd); |
d9d660f6 JG |
1392 | } |
1393 | ||
d9d660f6 JG |
1394 | static u32 scsiback_sess_get_index(struct se_session *se_sess) |
1395 | { | |
1396 | return 0; | |
1397 | } | |
1398 | ||
1399 | static int scsiback_write_pending(struct se_cmd *se_cmd) | |
1400 | { | |
1401 | /* Go ahead and process the write immediately */ | |
1402 | target_execute_cmd(se_cmd); | |
1403 | ||
1404 | return 0; | |
1405 | } | |
1406 | ||
d9d660f6 JG |
1407 | static void scsiback_set_default_node_attrs(struct se_node_acl *nacl) |
1408 | { | |
1409 | } | |
1410 | ||
d9d660f6 JG |
1411 | static int scsiback_get_cmd_state(struct se_cmd *se_cmd) |
1412 | { | |
1413 | return 0; | |
1414 | } | |
1415 | ||
1416 | static int scsiback_queue_data_in(struct se_cmd *se_cmd) | |
1417 | { | |
1418 | struct vscsibk_pend *pending_req = container_of(se_cmd, | |
1419 | struct vscsibk_pend, se_cmd); | |
1420 | ||
1421 | pending_req->result = SAM_STAT_GOOD; | |
1422 | scsiback_cmd_done(pending_req); | |
1423 | return 0; | |
1424 | } | |
1425 | ||
1426 | static int scsiback_queue_status(struct se_cmd *se_cmd) | |
1427 | { | |
1428 | struct vscsibk_pend *pending_req = container_of(se_cmd, | |
1429 | struct vscsibk_pend, se_cmd); | |
1430 | ||
1431 | if (se_cmd->sense_buffer && | |
1432 | ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || | |
1433 | (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) | |
1434 | pending_req->result = (DRIVER_SENSE << 24) | | |
1435 | SAM_STAT_CHECK_CONDITION; | |
1436 | else | |
1437 | pending_req->result = se_cmd->scsi_status; | |
1438 | ||
1439 | scsiback_cmd_done(pending_req); | |
1440 | return 0; | |
1441 | } | |
1442 | ||
1443 | static void scsiback_queue_tm_rsp(struct se_cmd *se_cmd) | |
1444 | { | |
9f4ab18a BVA |
1445 | struct vscsibk_pend *pending_req = container_of(se_cmd, |
1446 | struct vscsibk_pend, se_cmd); | |
d9d660f6 | 1447 | |
e3eac124 | 1448 | complete(&pending_req->tmr_done); |
d9d660f6 JG |
1449 | } |
1450 | ||
1451 | static void scsiback_aborted_task(struct se_cmd *se_cmd) | |
1452 | { | |
1453 | } | |
1454 | ||
2eafd729 | 1455 | static ssize_t scsiback_tpg_param_alias_show(struct config_item *item, |
d9d660f6 JG |
1456 | char *page) |
1457 | { | |
2eafd729 | 1458 | struct se_portal_group *se_tpg = param_to_tpg(item); |
d9d660f6 JG |
1459 | struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, |
1460 | se_tpg); | |
1461 | ssize_t rb; | |
1462 | ||
1463 | mutex_lock(&tpg->tv_tpg_mutex); | |
1464 | rb = snprintf(page, PAGE_SIZE, "%s\n", tpg->param_alias); | |
1465 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1466 | ||
1467 | return rb; | |
1468 | } | |
1469 | ||
2eafd729 | 1470 | static ssize_t scsiback_tpg_param_alias_store(struct config_item *item, |
d9d660f6 JG |
1471 | const char *page, size_t count) |
1472 | { | |
2eafd729 | 1473 | struct se_portal_group *se_tpg = param_to_tpg(item); |
d9d660f6 JG |
1474 | struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, |
1475 | se_tpg); | |
1476 | int len; | |
1477 | ||
1478 | if (strlen(page) >= VSCSI_NAMELEN) { | |
1479 | pr_err("param alias: %s, exceeds max: %d\n", page, | |
1480 | VSCSI_NAMELEN); | |
1481 | return -EINVAL; | |
1482 | } | |
1483 | ||
1484 | mutex_lock(&tpg->tv_tpg_mutex); | |
1485 | len = snprintf(tpg->param_alias, VSCSI_NAMELEN, "%s", page); | |
1486 | if (tpg->param_alias[len - 1] == '\n') | |
1487 | tpg->param_alias[len - 1] = '\0'; | |
1488 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1489 | ||
1490 | return count; | |
1491 | } | |
1492 | ||
2eafd729 | 1493 | CONFIGFS_ATTR(scsiback_tpg_param_, alias); |
d9d660f6 JG |
1494 | |
1495 | static struct configfs_attribute *scsiback_param_attrs[] = { | |
2eafd729 | 1496 | &scsiback_tpg_param_attr_alias, |
d9d660f6 JG |
1497 | NULL, |
1498 | }; | |
1499 | ||
fb444abe CH |
1500 | static int scsiback_alloc_sess_cb(struct se_portal_group *se_tpg, |
1501 | struct se_session *se_sess, void *p) | |
1502 | { | |
1503 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1504 | struct scsiback_tpg, se_tpg); | |
1505 | ||
1506 | tpg->tpg_nexus = p; | |
1507 | return 0; | |
1508 | } | |
1509 | ||
d9d660f6 JG |
1510 | static int scsiback_make_nexus(struct scsiback_tpg *tpg, |
1511 | const char *name) | |
1512 | { | |
d9d660f6 | 1513 | struct scsiback_nexus *tv_nexus; |
fb444abe | 1514 | int ret = 0; |
d9d660f6 JG |
1515 | |
1516 | mutex_lock(&tpg->tv_tpg_mutex); | |
1517 | if (tpg->tpg_nexus) { | |
d9d660f6 | 1518 | pr_debug("tpg->tpg_nexus already exists\n"); |
fb444abe CH |
1519 | ret = -EEXIST; |
1520 | goto out_unlock; | |
d9d660f6 | 1521 | } |
d9d660f6 JG |
1522 | |
1523 | tv_nexus = kzalloc(sizeof(struct scsiback_nexus), GFP_KERNEL); | |
1524 | if (!tv_nexus) { | |
fb444abe CH |
1525 | ret = -ENOMEM; |
1526 | goto out_unlock; | |
d9d660f6 | 1527 | } |
fb444abe | 1528 | |
fa834287 | 1529 | tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, |
2dbcdf33 NB |
1530 | VSCSI_DEFAULT_SESSION_TAGS, |
1531 | sizeof(struct vscsibk_pend), | |
fb444abe CH |
1532 | TARGET_PROT_NORMAL, name, |
1533 | tv_nexus, scsiback_alloc_sess_cb); | |
d9d660f6 | 1534 | if (IS_ERR(tv_nexus->tvn_se_sess)) { |
d9d660f6 | 1535 | kfree(tv_nexus); |
fb444abe CH |
1536 | ret = -ENOMEM; |
1537 | goto out_unlock; | |
d9d660f6 | 1538 | } |
d9d660f6 | 1539 | |
fb444abe | 1540 | out_unlock: |
d9d660f6 | 1541 | mutex_unlock(&tpg->tv_tpg_mutex); |
fb444abe | 1542 | return ret; |
d9d660f6 JG |
1543 | } |
1544 | ||
1545 | static int scsiback_drop_nexus(struct scsiback_tpg *tpg) | |
1546 | { | |
1547 | struct se_session *se_sess; | |
1548 | struct scsiback_nexus *tv_nexus; | |
1549 | ||
1550 | mutex_lock(&tpg->tv_tpg_mutex); | |
1551 | tv_nexus = tpg->tpg_nexus; | |
1552 | if (!tv_nexus) { | |
1553 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1554 | return -ENODEV; | |
1555 | } | |
1556 | ||
1557 | se_sess = tv_nexus->tvn_se_sess; | |
1558 | if (!se_sess) { | |
1559 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1560 | return -ENODEV; | |
1561 | } | |
1562 | ||
1563 | if (tpg->tv_tpg_port_count != 0) { | |
1564 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1565 | pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG port count: %d\n", | |
1566 | tpg->tv_tpg_port_count); | |
1567 | return -EBUSY; | |
1568 | } | |
1569 | ||
1570 | if (tpg->tv_tpg_fe_count != 0) { | |
1571 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1572 | pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG frontend count: %d\n", | |
1573 | tpg->tv_tpg_fe_count); | |
1574 | return -EBUSY; | |
1575 | } | |
1576 | ||
78574878 | 1577 | pr_debug("Removing I_T Nexus to emulated %s Initiator Port: %s\n", |
d9d660f6 JG |
1578 | scsiback_dump_proto_id(tpg->tport), |
1579 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
1580 | ||
1581 | /* | |
1582 | * Release the SCSI I_T Nexus to the emulated xen-pvscsi Target Port | |
1583 | */ | |
25b88550 | 1584 | target_remove_session(se_sess); |
d9d660f6 JG |
1585 | tpg->tpg_nexus = NULL; |
1586 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1587 | ||
1588 | kfree(tv_nexus); | |
1589 | return 0; | |
1590 | } | |
1591 | ||
2eafd729 | 1592 | static ssize_t scsiback_tpg_nexus_show(struct config_item *item, char *page) |
d9d660f6 | 1593 | { |
2eafd729 | 1594 | struct se_portal_group *se_tpg = to_tpg(item); |
d9d660f6 JG |
1595 | struct scsiback_tpg *tpg = container_of(se_tpg, |
1596 | struct scsiback_tpg, se_tpg); | |
1597 | struct scsiback_nexus *tv_nexus; | |
1598 | ssize_t ret; | |
1599 | ||
1600 | mutex_lock(&tpg->tv_tpg_mutex); | |
1601 | tv_nexus = tpg->tpg_nexus; | |
1602 | if (!tv_nexus) { | |
1603 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1604 | return -ENODEV; | |
1605 | } | |
1606 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1607 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
1608 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1609 | ||
1610 | return ret; | |
1611 | } | |
1612 | ||
2eafd729 CH |
1613 | static ssize_t scsiback_tpg_nexus_store(struct config_item *item, |
1614 | const char *page, size_t count) | |
d9d660f6 | 1615 | { |
2eafd729 | 1616 | struct se_portal_group *se_tpg = to_tpg(item); |
d9d660f6 JG |
1617 | struct scsiback_tpg *tpg = container_of(se_tpg, |
1618 | struct scsiback_tpg, se_tpg); | |
1619 | struct scsiback_tport *tport_wwn = tpg->tport; | |
1620 | unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr; | |
1621 | int ret; | |
1622 | /* | |
78574878 | 1623 | * Shutdown the active I_T nexus if 'NULL' is passed. |
d9d660f6 JG |
1624 | */ |
1625 | if (!strncmp(page, "NULL", 4)) { | |
1626 | ret = scsiback_drop_nexus(tpg); | |
1627 | return (!ret) ? count : ret; | |
1628 | } | |
1629 | /* | |
1630 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1631 | * the fabric protocol_id set in scsiback_make_tport(), and call | |
1632 | * scsiback_make_nexus(). | |
1633 | */ | |
1634 | if (strlen(page) >= VSCSI_NAMELEN) { | |
1635 | pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n", | |
1636 | page, VSCSI_NAMELEN); | |
1637 | return -EINVAL; | |
1638 | } | |
1639 | snprintf(&i_port[0], VSCSI_NAMELEN, "%s", page); | |
1640 | ||
1641 | ptr = strstr(i_port, "naa."); | |
1642 | if (ptr) { | |
1643 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
1644 | pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n", | |
1645 | i_port, scsiback_dump_proto_id(tport_wwn)); | |
1646 | return -EINVAL; | |
1647 | } | |
1648 | port_ptr = &i_port[0]; | |
1649 | goto check_newline; | |
1650 | } | |
1651 | ptr = strstr(i_port, "fc."); | |
1652 | if (ptr) { | |
1653 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
1654 | pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n", | |
1655 | i_port, scsiback_dump_proto_id(tport_wwn)); | |
1656 | return -EINVAL; | |
1657 | } | |
1658 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1659 | goto check_newline; | |
1660 | } | |
1661 | ptr = strstr(i_port, "iqn."); | |
1662 | if (ptr) { | |
1663 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
1664 | pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n", | |
1665 | i_port, scsiback_dump_proto_id(tport_wwn)); | |
1666 | return -EINVAL; | |
1667 | } | |
1668 | port_ptr = &i_port[0]; | |
1669 | goto check_newline; | |
1670 | } | |
1671 | pr_err("Unable to locate prefix for emulated Initiator Port: %s\n", | |
1672 | i_port); | |
1673 | return -EINVAL; | |
1674 | /* | |
1675 | * Clear any trailing newline for the NAA WWN | |
1676 | */ | |
1677 | check_newline: | |
1678 | if (i_port[strlen(i_port) - 1] == '\n') | |
1679 | i_port[strlen(i_port) - 1] = '\0'; | |
1680 | ||
1681 | ret = scsiback_make_nexus(tpg, port_ptr); | |
1682 | if (ret < 0) | |
1683 | return ret; | |
1684 | ||
1685 | return count; | |
1686 | } | |
1687 | ||
2eafd729 | 1688 | CONFIGFS_ATTR(scsiback_tpg_, nexus); |
d9d660f6 JG |
1689 | |
1690 | static struct configfs_attribute *scsiback_tpg_attrs[] = { | |
2eafd729 | 1691 | &scsiback_tpg_attr_nexus, |
d9d660f6 JG |
1692 | NULL, |
1693 | }; | |
1694 | ||
1695 | static ssize_t | |
2eafd729 | 1696 | scsiback_wwn_version_show(struct config_item *item, char *page) |
d9d660f6 JG |
1697 | { |
1698 | return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on " | |
1699 | UTS_RELEASE"\n", | |
1700 | VSCSI_VERSION, utsname()->sysname, utsname()->machine); | |
1701 | } | |
1702 | ||
2eafd729 | 1703 | CONFIGFS_ATTR_RO(scsiback_wwn_, version); |
d9d660f6 JG |
1704 | |
1705 | static struct configfs_attribute *scsiback_wwn_attrs[] = { | |
2eafd729 | 1706 | &scsiback_wwn_attr_version, |
d9d660f6 JG |
1707 | NULL, |
1708 | }; | |
1709 | ||
d9d660f6 JG |
1710 | static int scsiback_port_link(struct se_portal_group *se_tpg, |
1711 | struct se_lun *lun) | |
1712 | { | |
1713 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1714 | struct scsiback_tpg, se_tpg); | |
1715 | ||
1716 | mutex_lock(&tpg->tv_tpg_mutex); | |
1717 | tpg->tv_tpg_port_count++; | |
1718 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1719 | ||
1720 | return 0; | |
1721 | } | |
1722 | ||
1723 | static void scsiback_port_unlink(struct se_portal_group *se_tpg, | |
1724 | struct se_lun *lun) | |
1725 | { | |
1726 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1727 | struct scsiback_tpg, se_tpg); | |
1728 | ||
1729 | mutex_lock(&tpg->tv_tpg_mutex); | |
1730 | tpg->tv_tpg_port_count--; | |
1731 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1732 | } | |
1733 | ||
1734 | static struct se_portal_group * | |
aa090eab | 1735 | scsiback_make_tpg(struct se_wwn *wwn, const char *name) |
d9d660f6 JG |
1736 | { |
1737 | struct scsiback_tport *tport = container_of(wwn, | |
1738 | struct scsiback_tport, tport_wwn); | |
1739 | ||
1740 | struct scsiback_tpg *tpg; | |
495daef9 | 1741 | u16 tpgt; |
d9d660f6 JG |
1742 | int ret; |
1743 | ||
1744 | if (strstr(name, "tpgt_") != name) | |
1745 | return ERR_PTR(-EINVAL); | |
495daef9 DC |
1746 | ret = kstrtou16(name + 5, 10, &tpgt); |
1747 | if (ret) | |
1748 | return ERR_PTR(ret); | |
d9d660f6 JG |
1749 | |
1750 | tpg = kzalloc(sizeof(struct scsiback_tpg), GFP_KERNEL); | |
1751 | if (!tpg) | |
1752 | return ERR_PTR(-ENOMEM); | |
1753 | ||
1754 | mutex_init(&tpg->tv_tpg_mutex); | |
1755 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
1756 | INIT_LIST_HEAD(&tpg->info_list); | |
1757 | tpg->tport = tport; | |
1758 | tpg->tport_tpgt = tpgt; | |
1759 | ||
bc0c94b1 | 1760 | ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
d9d660f6 JG |
1761 | if (ret < 0) { |
1762 | kfree(tpg); | |
1763 | return NULL; | |
1764 | } | |
1765 | mutex_lock(&scsiback_mutex); | |
1766 | list_add_tail(&tpg->tv_tpg_list, &scsiback_list); | |
1767 | mutex_unlock(&scsiback_mutex); | |
1768 | ||
1769 | return &tpg->se_tpg; | |
1770 | } | |
1771 | ||
1772 | static void scsiback_drop_tpg(struct se_portal_group *se_tpg) | |
1773 | { | |
1774 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1775 | struct scsiback_tpg, se_tpg); | |
1776 | ||
1777 | mutex_lock(&scsiback_mutex); | |
1778 | list_del(&tpg->tv_tpg_list); | |
1779 | mutex_unlock(&scsiback_mutex); | |
1780 | /* | |
1781 | * Release the virtual I_T Nexus for this xen-pvscsi TPG | |
1782 | */ | |
1783 | scsiback_drop_nexus(tpg); | |
1784 | /* | |
78574878 | 1785 | * Deregister the se_tpg from TCM. |
d9d660f6 JG |
1786 | */ |
1787 | core_tpg_deregister(se_tpg); | |
1788 | kfree(tpg); | |
1789 | } | |
1790 | ||
1791 | static int scsiback_check_true(struct se_portal_group *se_tpg) | |
1792 | { | |
1793 | return 1; | |
1794 | } | |
1795 | ||
1796 | static int scsiback_check_false(struct se_portal_group *se_tpg) | |
1797 | { | |
1798 | return 0; | |
1799 | } | |
1800 | ||
9ac8928e CH |
1801 | static const struct target_core_fabric_ops scsiback_ops = { |
1802 | .module = THIS_MODULE, | |
30c7ca93 | 1803 | .fabric_name = "xen-pvscsi", |
d9d660f6 JG |
1804 | .tpg_get_wwn = scsiback_get_fabric_wwn, |
1805 | .tpg_get_tag = scsiback_get_tag, | |
d9d660f6 JG |
1806 | .tpg_check_demo_mode = scsiback_check_true, |
1807 | .tpg_check_demo_mode_cache = scsiback_check_true, | |
1808 | .tpg_check_demo_mode_write_protect = scsiback_check_false, | |
1809 | .tpg_check_prod_mode_write_protect = scsiback_check_false, | |
d9d660f6 JG |
1810 | .tpg_get_inst_index = scsiback_tpg_get_inst_index, |
1811 | .check_stop_free = scsiback_check_stop_free, | |
1812 | .release_cmd = scsiback_release_cmd, | |
d9d660f6 JG |
1813 | .sess_get_index = scsiback_sess_get_index, |
1814 | .sess_get_initiator_sid = NULL, | |
1815 | .write_pending = scsiback_write_pending, | |
d9d660f6 | 1816 | .set_default_node_attributes = scsiback_set_default_node_attrs, |
d9d660f6 JG |
1817 | .get_cmd_state = scsiback_get_cmd_state, |
1818 | .queue_data_in = scsiback_queue_data_in, | |
1819 | .queue_status = scsiback_queue_status, | |
1820 | .queue_tm_rsp = scsiback_queue_tm_rsp, | |
1821 | .aborted_task = scsiback_aborted_task, | |
1822 | /* | |
1823 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
1824 | */ | |
1825 | .fabric_make_wwn = scsiback_make_tport, | |
1826 | .fabric_drop_wwn = scsiback_drop_tport, | |
1827 | .fabric_make_tpg = scsiback_make_tpg, | |
1828 | .fabric_drop_tpg = scsiback_drop_tpg, | |
1829 | .fabric_post_link = scsiback_port_link, | |
1830 | .fabric_pre_unlink = scsiback_port_unlink, | |
d9d660f6 | 1831 | |
9ac8928e CH |
1832 | .tfc_wwn_attrs = scsiback_wwn_attrs, |
1833 | .tfc_tpg_base_attrs = scsiback_tpg_attrs, | |
1834 | .tfc_tpg_param_attrs = scsiback_param_attrs, | |
d9d660f6 JG |
1835 | }; |
1836 | ||
1837 | static const struct xenbus_device_id scsiback_ids[] = { | |
1838 | { "vscsi" }, | |
1839 | { "" } | |
1840 | }; | |
1841 | ||
95afae48 DV |
1842 | static struct xenbus_driver scsiback_driver = { |
1843 | .ids = scsiback_ids, | |
d9d660f6 JG |
1844 | .probe = scsiback_probe, |
1845 | .remove = scsiback_remove, | |
1846 | .otherend_changed = scsiback_frontend_changed | |
95afae48 | 1847 | }; |
d9d660f6 | 1848 | |
d9d660f6 JG |
1849 | static int __init scsiback_init(void) |
1850 | { | |
1851 | int ret; | |
1852 | ||
1853 | if (!xen_domain()) | |
1854 | return -ENODEV; | |
1855 | ||
9ac8928e CH |
1856 | pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n", |
1857 | VSCSI_VERSION, utsname()->sysname, utsname()->machine); | |
1858 | ||
d9d660f6 JG |
1859 | ret = xenbus_register_backend(&scsiback_driver); |
1860 | if (ret) | |
2dbcdf33 | 1861 | goto out; |
d9d660f6 | 1862 | |
9ac8928e | 1863 | ret = target_register_template(&scsiback_ops); |
d9d660f6 JG |
1864 | if (ret) |
1865 | goto out_unregister_xenbus; | |
1866 | ||
1867 | return 0; | |
1868 | ||
1869 | out_unregister_xenbus: | |
1870 | xenbus_unregister_driver(&scsiback_driver); | |
2dbcdf33 | 1871 | out: |
78574878 | 1872 | pr_err("%s: error %d\n", __func__, ret); |
d9d660f6 JG |
1873 | return ret; |
1874 | } | |
1875 | ||
1876 | static void __exit scsiback_exit(void) | |
1877 | { | |
1878 | struct page *page; | |
1879 | ||
1880 | while (free_pages_num) { | |
1881 | if (get_free_page(&page)) | |
1882 | BUG(); | |
ff4b156f | 1883 | gnttab_free_pages(1, &page); |
d9d660f6 | 1884 | } |
9ac8928e | 1885 | target_unregister_template(&scsiback_ops); |
d9d660f6 | 1886 | xenbus_unregister_driver(&scsiback_driver); |
d9d660f6 JG |
1887 | } |
1888 | ||
1889 | module_init(scsiback_init); | |
1890 | module_exit(scsiback_exit); | |
1891 | ||
1892 | MODULE_DESCRIPTION("Xen SCSI backend driver"); | |
1893 | MODULE_LICENSE("Dual BSD/GPL"); | |
1894 | MODULE_ALIAS("xen-backend:vscsi"); | |
1895 | MODULE_AUTHOR("Juergen Gross <jgross@suse.com>"); |