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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 | #include <target/target_core_fabric_configfs.h> |
57 | ||
58 | #include <asm/hypervisor.h> | |
59 | ||
60 | #include <xen/xen.h> | |
61 | #include <xen/balloon.h> | |
62 | #include <xen/events.h> | |
63 | #include <xen/xenbus.h> | |
64 | #include <xen/grant_table.h> | |
65 | #include <xen/page.h> | |
66 | ||
67 | #include <xen/interface/grant_table.h> | |
68 | #include <xen/interface/io/vscsiif.h> | |
69 | ||
d9d660f6 JG |
70 | #define VSCSI_VERSION "v0.1" |
71 | #define VSCSI_NAMELEN 32 | |
72 | ||
73 | struct ids_tuple { | |
74 | unsigned int hst; /* host */ | |
75 | unsigned int chn; /* channel */ | |
76 | unsigned int tgt; /* target */ | |
77 | unsigned int lun; /* LUN */ | |
78 | }; | |
79 | ||
80 | struct v2p_entry { | |
81 | struct ids_tuple v; /* translate from */ | |
82 | struct scsiback_tpg *tpg; /* translate to */ | |
83 | unsigned int lun; | |
84 | struct kref kref; | |
85 | struct list_head l; | |
86 | }; | |
87 | ||
88 | struct vscsibk_info { | |
89 | struct xenbus_device *dev; | |
90 | ||
91 | domid_t domid; | |
92 | unsigned int irq; | |
93 | ||
94 | struct vscsiif_back_ring ring; | |
95 | int ring_error; | |
96 | ||
97 | spinlock_t ring_lock; | |
98 | atomic_t nr_unreplied_reqs; | |
99 | ||
100 | spinlock_t v2p_lock; | |
101 | struct list_head v2p_entry_lists; | |
102 | ||
103 | wait_queue_head_t waiting_to_free; | |
104 | }; | |
105 | ||
106 | /* theoretical maximum of grants for one request */ | |
107 | #define VSCSI_MAX_GRANTS (SG_ALL + VSCSIIF_SG_TABLESIZE) | |
108 | ||
109 | /* | |
110 | * VSCSI_GRANT_BATCH is the maximum number of grants to be processed in one | |
111 | * call to map/unmap grants. Don't choose it too large, as there are arrays | |
112 | * with VSCSI_GRANT_BATCH elements allocated on the stack. | |
113 | */ | |
114 | #define VSCSI_GRANT_BATCH 16 | |
115 | ||
116 | struct vscsibk_pend { | |
117 | uint16_t rqid; | |
118 | ||
119 | uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE]; | |
120 | uint8_t cmd_len; | |
121 | ||
122 | uint8_t sc_data_direction; | |
123 | uint16_t n_sg; /* real length of SG list */ | |
124 | uint16_t n_grants; /* SG pages and potentially SG list */ | |
125 | uint32_t data_len; | |
126 | uint32_t result; | |
127 | ||
128 | struct vscsibk_info *info; | |
129 | struct v2p_entry *v2p; | |
130 | struct scatterlist *sgl; | |
131 | ||
132 | uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE]; | |
133 | ||
134 | grant_handle_t grant_handles[VSCSI_MAX_GRANTS]; | |
135 | struct page *pages[VSCSI_MAX_GRANTS]; | |
136 | ||
137 | struct se_cmd se_cmd; | |
138 | }; | |
139 | ||
140 | struct scsiback_tmr { | |
141 | atomic_t tmr_complete; | |
142 | wait_queue_head_t tmr_wait; | |
143 | }; | |
144 | ||
145 | struct scsiback_nexus { | |
146 | /* Pointer to TCM session for I_T Nexus */ | |
147 | struct se_session *tvn_se_sess; | |
148 | }; | |
149 | ||
150 | struct scsiback_tport { | |
151 | /* SCSI protocol the tport is providing */ | |
152 | u8 tport_proto_id; | |
153 | /* Binary World Wide unique Port Name for pvscsi Target port */ | |
154 | u64 tport_wwpn; | |
155 | /* ASCII formatted WWPN for pvscsi Target port */ | |
156 | char tport_name[VSCSI_NAMELEN]; | |
157 | /* Returned by scsiback_make_tport() */ | |
158 | struct se_wwn tport_wwn; | |
159 | }; | |
160 | ||
161 | struct scsiback_tpg { | |
162 | /* scsiback port target portal group tag for TCM */ | |
163 | u16 tport_tpgt; | |
164 | /* track number of TPG Port/Lun Links wrt explicit I_T Nexus shutdown */ | |
165 | int tv_tpg_port_count; | |
166 | /* xen-pvscsi references to tpg_nexus, protected by tv_tpg_mutex */ | |
167 | int tv_tpg_fe_count; | |
168 | /* list for scsiback_list */ | |
169 | struct list_head tv_tpg_list; | |
170 | /* Used to protect access for tpg_nexus */ | |
171 | struct mutex tv_tpg_mutex; | |
172 | /* Pointer to the TCM pvscsi I_T Nexus for this TPG endpoint */ | |
173 | struct scsiback_nexus *tpg_nexus; | |
174 | /* Pointer back to scsiback_tport */ | |
175 | struct scsiback_tport *tport; | |
176 | /* Returned by scsiback_make_tpg() */ | |
177 | struct se_portal_group se_tpg; | |
178 | /* alias used in xenstore */ | |
179 | char param_alias[VSCSI_NAMELEN]; | |
180 | /* list of info structures related to this target portal group */ | |
181 | struct list_head info_list; | |
182 | }; | |
183 | ||
184 | #define SCSIBACK_INVALID_HANDLE (~0) | |
185 | ||
186 | static bool log_print_stat; | |
187 | module_param(log_print_stat, bool, 0644); | |
188 | ||
189 | static int scsiback_max_buffer_pages = 1024; | |
190 | module_param_named(max_buffer_pages, scsiback_max_buffer_pages, int, 0644); | |
191 | MODULE_PARM_DESC(max_buffer_pages, | |
192 | "Maximum number of free pages to keep in backend buffer"); | |
193 | ||
194 | static struct kmem_cache *scsiback_cachep; | |
195 | static DEFINE_SPINLOCK(free_pages_lock); | |
196 | static int free_pages_num; | |
197 | static LIST_HEAD(scsiback_free_pages); | |
198 | ||
199 | /* Global spinlock to protect scsiback TPG list */ | |
200 | static DEFINE_MUTEX(scsiback_mutex); | |
201 | static LIST_HEAD(scsiback_list); | |
202 | ||
d9d660f6 JG |
203 | static void scsiback_get(struct vscsibk_info *info) |
204 | { | |
205 | atomic_inc(&info->nr_unreplied_reqs); | |
206 | } | |
207 | ||
208 | static void scsiback_put(struct vscsibk_info *info) | |
209 | { | |
210 | if (atomic_dec_and_test(&info->nr_unreplied_reqs)) | |
211 | wake_up(&info->waiting_to_free); | |
212 | } | |
213 | ||
214 | static void put_free_pages(struct page **page, int num) | |
215 | { | |
216 | unsigned long flags; | |
217 | int i = free_pages_num + num, n = num; | |
218 | ||
219 | if (num == 0) | |
220 | return; | |
221 | if (i > scsiback_max_buffer_pages) { | |
222 | n = min(num, i - scsiback_max_buffer_pages); | |
ff4b156f | 223 | gnttab_free_pages(n, page + num - n); |
d9d660f6 JG |
224 | n = num - n; |
225 | } | |
226 | spin_lock_irqsave(&free_pages_lock, flags); | |
227 | for (i = 0; i < n; i++) | |
228 | list_add(&page[i]->lru, &scsiback_free_pages); | |
229 | free_pages_num += n; | |
230 | spin_unlock_irqrestore(&free_pages_lock, flags); | |
231 | } | |
232 | ||
233 | static int get_free_page(struct page **page) | |
234 | { | |
235 | unsigned long flags; | |
236 | ||
237 | spin_lock_irqsave(&free_pages_lock, flags); | |
238 | if (list_empty(&scsiback_free_pages)) { | |
239 | spin_unlock_irqrestore(&free_pages_lock, flags); | |
ff4b156f | 240 | return gnttab_alloc_pages(1, page); |
d9d660f6 JG |
241 | } |
242 | page[0] = list_first_entry(&scsiback_free_pages, struct page, lru); | |
243 | list_del(&page[0]->lru); | |
244 | free_pages_num--; | |
245 | spin_unlock_irqrestore(&free_pages_lock, flags); | |
246 | return 0; | |
247 | } | |
248 | ||
249 | static unsigned long vaddr_page(struct page *page) | |
250 | { | |
251 | unsigned long pfn = page_to_pfn(page); | |
252 | ||
253 | return (unsigned long)pfn_to_kaddr(pfn); | |
254 | } | |
255 | ||
256 | static unsigned long vaddr(struct vscsibk_pend *req, int seg) | |
257 | { | |
258 | return vaddr_page(req->pages[seg]); | |
259 | } | |
260 | ||
261 | static void scsiback_print_status(char *sense_buffer, int errors, | |
262 | struct vscsibk_pend *pending_req) | |
263 | { | |
264 | struct scsiback_tpg *tpg = pending_req->v2p->tpg; | |
265 | ||
78574878 | 266 | pr_err("[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n", |
d9d660f6 JG |
267 | tpg->tport->tport_name, pending_req->v2p->lun, |
268 | pending_req->cmnd[0], status_byte(errors), msg_byte(errors), | |
269 | host_byte(errors), driver_byte(errors)); | |
d9d660f6 JG |
270 | } |
271 | ||
272 | static void scsiback_fast_flush_area(struct vscsibk_pend *req) | |
273 | { | |
274 | struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH]; | |
275 | struct page *pages[VSCSI_GRANT_BATCH]; | |
276 | unsigned int i, invcount = 0; | |
277 | grant_handle_t handle; | |
278 | int err; | |
279 | ||
280 | kfree(req->sgl); | |
281 | req->sgl = NULL; | |
282 | req->n_sg = 0; | |
283 | ||
284 | if (!req->n_grants) | |
285 | return; | |
286 | ||
287 | for (i = 0; i < req->n_grants; i++) { | |
288 | handle = req->grant_handles[i]; | |
289 | if (handle == SCSIBACK_INVALID_HANDLE) | |
290 | continue; | |
291 | gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i), | |
292 | GNTMAP_host_map, handle); | |
293 | req->grant_handles[i] = SCSIBACK_INVALID_HANDLE; | |
294 | pages[invcount] = req->pages[i]; | |
295 | put_page(pages[invcount]); | |
296 | invcount++; | |
297 | if (invcount < VSCSI_GRANT_BATCH) | |
298 | continue; | |
299 | err = gnttab_unmap_refs(unmap, NULL, pages, invcount); | |
300 | BUG_ON(err); | |
301 | invcount = 0; | |
302 | } | |
303 | ||
304 | if (invcount) { | |
305 | err = gnttab_unmap_refs(unmap, NULL, pages, invcount); | |
306 | BUG_ON(err); | |
307 | } | |
308 | ||
309 | put_free_pages(req->pages, req->n_grants); | |
310 | req->n_grants = 0; | |
311 | } | |
312 | ||
313 | static void scsiback_free_translation_entry(struct kref *kref) | |
314 | { | |
315 | struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref); | |
316 | struct scsiback_tpg *tpg = entry->tpg; | |
317 | ||
318 | mutex_lock(&tpg->tv_tpg_mutex); | |
319 | tpg->tv_tpg_fe_count--; | |
320 | mutex_unlock(&tpg->tv_tpg_mutex); | |
321 | ||
322 | kfree(entry); | |
323 | } | |
324 | ||
325 | static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result, | |
326 | uint32_t resid, struct vscsibk_pend *pending_req) | |
327 | { | |
328 | struct vscsiif_response *ring_res; | |
329 | struct vscsibk_info *info = pending_req->info; | |
330 | int notify; | |
331 | struct scsi_sense_hdr sshdr; | |
332 | unsigned long flags; | |
333 | unsigned len; | |
334 | ||
335 | spin_lock_irqsave(&info->ring_lock, flags); | |
336 | ||
337 | ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt); | |
338 | info->ring.rsp_prod_pvt++; | |
339 | ||
340 | ring_res->rslt = result; | |
341 | ring_res->rqid = pending_req->rqid; | |
342 | ||
343 | if (sense_buffer != NULL && | |
344 | scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE, | |
345 | &sshdr)) { | |
346 | len = min_t(unsigned, 8 + sense_buffer[7], | |
347 | VSCSIIF_SENSE_BUFFERSIZE); | |
348 | memcpy(ring_res->sense_buffer, sense_buffer, len); | |
349 | ring_res->sense_len = len; | |
350 | } else { | |
351 | ring_res->sense_len = 0; | |
352 | } | |
353 | ||
354 | ring_res->residual_len = resid; | |
355 | ||
356 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify); | |
357 | spin_unlock_irqrestore(&info->ring_lock, flags); | |
358 | ||
359 | if (notify) | |
360 | notify_remote_via_irq(info->irq); | |
361 | ||
362 | if (pending_req->v2p) | |
363 | kref_put(&pending_req->v2p->kref, | |
364 | scsiback_free_translation_entry); | |
365 | } | |
366 | ||
367 | static void scsiback_cmd_done(struct vscsibk_pend *pending_req) | |
368 | { | |
369 | struct vscsibk_info *info = pending_req->info; | |
370 | unsigned char *sense_buffer; | |
371 | unsigned int resid; | |
372 | int errors; | |
373 | ||
374 | sense_buffer = pending_req->sense_buffer; | |
375 | resid = pending_req->se_cmd.residual_count; | |
376 | errors = pending_req->result; | |
377 | ||
378 | if (errors && log_print_stat) | |
379 | scsiback_print_status(sense_buffer, errors, pending_req); | |
380 | ||
381 | scsiback_fast_flush_area(pending_req); | |
382 | scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req); | |
383 | scsiback_put(info); | |
384 | } | |
385 | ||
386 | static void scsiback_cmd_exec(struct vscsibk_pend *pending_req) | |
387 | { | |
388 | struct se_cmd *se_cmd = &pending_req->se_cmd; | |
389 | struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess; | |
390 | int rc; | |
391 | ||
392 | memset(pending_req->sense_buffer, 0, VSCSIIF_SENSE_BUFFERSIZE); | |
393 | ||
394 | memset(se_cmd, 0, sizeof(*se_cmd)); | |
395 | ||
396 | scsiback_get(pending_req->info); | |
649ee054 | 397 | se_cmd->tag = pending_req->rqid; |
d9d660f6 JG |
398 | rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd, |
399 | pending_req->sense_buffer, pending_req->v2p->lun, | |
400 | pending_req->data_len, 0, | |
401 | pending_req->sc_data_direction, 0, | |
402 | pending_req->sgl, pending_req->n_sg, | |
403 | NULL, 0, NULL, 0); | |
404 | if (rc < 0) { | |
405 | transport_send_check_condition_and_sense(se_cmd, | |
406 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); | |
407 | transport_generic_free_cmd(se_cmd, 0); | |
408 | } | |
409 | } | |
410 | ||
411 | static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map, | |
412 | struct page **pg, grant_handle_t *grant, int cnt) | |
413 | { | |
414 | int err, i; | |
415 | ||
416 | if (!cnt) | |
417 | return 0; | |
418 | ||
419 | err = gnttab_map_refs(map, NULL, pg, cnt); | |
420 | BUG_ON(err); | |
421 | for (i = 0; i < cnt; i++) { | |
422 | if (unlikely(map[i].status != GNTST_okay)) { | |
78574878 | 423 | pr_err("invalid buffer -- could not remap it\n"); |
d9d660f6 JG |
424 | map[i].handle = SCSIBACK_INVALID_HANDLE; |
425 | err = -ENOMEM; | |
426 | } else { | |
427 | get_page(pg[i]); | |
428 | } | |
429 | grant[i] = map[i].handle; | |
430 | } | |
431 | return err; | |
432 | } | |
433 | ||
434 | static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req, | |
435 | struct scsiif_request_segment *seg, struct page **pg, | |
436 | grant_handle_t *grant, int cnt, u32 flags) | |
437 | { | |
438 | int mapcount = 0, i, err = 0; | |
439 | struct gnttab_map_grant_ref map[VSCSI_GRANT_BATCH]; | |
440 | struct vscsibk_info *info = pending_req->info; | |
441 | ||
442 | for (i = 0; i < cnt; i++) { | |
443 | if (get_free_page(pg + mapcount)) { | |
444 | put_free_pages(pg, mapcount); | |
78574878 | 445 | pr_err("no grant page\n"); |
d9d660f6 JG |
446 | return -ENOMEM; |
447 | } | |
448 | gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]), | |
449 | flags, seg[i].gref, info->domid); | |
450 | mapcount++; | |
451 | if (mapcount < VSCSI_GRANT_BATCH) | |
452 | continue; | |
453 | err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); | |
454 | pg += mapcount; | |
455 | grant += mapcount; | |
456 | pending_req->n_grants += mapcount; | |
457 | if (err) | |
458 | return err; | |
459 | mapcount = 0; | |
460 | } | |
461 | err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); | |
462 | pending_req->n_grants += mapcount; | |
463 | return err; | |
464 | } | |
465 | ||
466 | static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req, | |
467 | struct vscsibk_pend *pending_req) | |
468 | { | |
469 | u32 flags; | |
470 | int i, err, n_segs, i_seg = 0; | |
471 | struct page **pg; | |
472 | struct scsiif_request_segment *seg; | |
473 | unsigned long end_seg = 0; | |
474 | unsigned int nr_segments = (unsigned int)ring_req->nr_segments; | |
475 | unsigned int nr_sgl = 0; | |
476 | struct scatterlist *sg; | |
477 | grant_handle_t *grant; | |
478 | ||
479 | pending_req->n_sg = 0; | |
480 | pending_req->n_grants = 0; | |
481 | pending_req->data_len = 0; | |
482 | ||
483 | nr_segments &= ~VSCSIIF_SG_GRANT; | |
484 | if (!nr_segments) | |
485 | return 0; | |
486 | ||
487 | if (nr_segments > VSCSIIF_SG_TABLESIZE) { | |
78574878 | 488 | pr_debug("invalid parameter nr_seg = %d\n", |
d9d660f6 JG |
489 | ring_req->nr_segments); |
490 | return -EINVAL; | |
491 | } | |
492 | ||
493 | if (ring_req->nr_segments & VSCSIIF_SG_GRANT) { | |
494 | err = scsiback_gnttab_data_map_list(pending_req, ring_req->seg, | |
495 | pending_req->pages, pending_req->grant_handles, | |
496 | nr_segments, GNTMAP_host_map | GNTMAP_readonly); | |
497 | if (err) | |
498 | return err; | |
499 | nr_sgl = nr_segments; | |
500 | nr_segments = 0; | |
501 | for (i = 0; i < nr_sgl; i++) { | |
502 | n_segs = ring_req->seg[i].length / | |
503 | sizeof(struct scsiif_request_segment); | |
504 | if ((unsigned)ring_req->seg[i].offset + | |
505 | (unsigned)ring_req->seg[i].length > PAGE_SIZE || | |
506 | n_segs * sizeof(struct scsiif_request_segment) != | |
507 | ring_req->seg[i].length) | |
508 | return -EINVAL; | |
509 | nr_segments += n_segs; | |
510 | } | |
511 | if (nr_segments > SG_ALL) { | |
78574878 | 512 | pr_debug("invalid nr_seg = %d\n", nr_segments); |
d9d660f6 JG |
513 | return -EINVAL; |
514 | } | |
515 | } | |
516 | ||
78574878 | 517 | /* free of (sgl) in fast_flush_area() */ |
d9d660f6 JG |
518 | pending_req->sgl = kmalloc_array(nr_segments, |
519 | sizeof(struct scatterlist), GFP_KERNEL); | |
520 | if (!pending_req->sgl) | |
521 | return -ENOMEM; | |
522 | ||
523 | sg_init_table(pending_req->sgl, nr_segments); | |
524 | pending_req->n_sg = nr_segments; | |
525 | ||
526 | flags = GNTMAP_host_map; | |
527 | if (pending_req->sc_data_direction == DMA_TO_DEVICE) | |
528 | flags |= GNTMAP_readonly; | |
529 | ||
530 | pg = pending_req->pages + nr_sgl; | |
531 | grant = pending_req->grant_handles + nr_sgl; | |
532 | if (!nr_sgl) { | |
533 | seg = ring_req->seg; | |
534 | err = scsiback_gnttab_data_map_list(pending_req, seg, | |
535 | pg, grant, nr_segments, flags); | |
536 | if (err) | |
537 | return err; | |
538 | } else { | |
539 | for (i = 0; i < nr_sgl; i++) { | |
540 | seg = (struct scsiif_request_segment *)( | |
541 | vaddr(pending_req, i) + ring_req->seg[i].offset); | |
542 | n_segs = ring_req->seg[i].length / | |
543 | sizeof(struct scsiif_request_segment); | |
544 | err = scsiback_gnttab_data_map_list(pending_req, seg, | |
545 | pg, grant, n_segs, flags); | |
546 | if (err) | |
547 | return err; | |
548 | pg += n_segs; | |
549 | grant += n_segs; | |
550 | } | |
551 | end_seg = vaddr(pending_req, 0) + ring_req->seg[0].offset; | |
552 | seg = (struct scsiif_request_segment *)end_seg; | |
553 | end_seg += ring_req->seg[0].length; | |
554 | pg = pending_req->pages + nr_sgl; | |
555 | } | |
556 | ||
557 | for_each_sg(pending_req->sgl, sg, nr_segments, i) { | |
558 | sg_set_page(sg, pg[i], seg->length, seg->offset); | |
559 | pending_req->data_len += seg->length; | |
560 | seg++; | |
561 | if (nr_sgl && (unsigned long)seg >= end_seg) { | |
562 | i_seg++; | |
563 | end_seg = vaddr(pending_req, i_seg) + | |
564 | ring_req->seg[i_seg].offset; | |
565 | seg = (struct scsiif_request_segment *)end_seg; | |
566 | end_seg += ring_req->seg[i_seg].length; | |
567 | } | |
568 | if (sg->offset >= PAGE_SIZE || | |
569 | sg->length > PAGE_SIZE || | |
570 | sg->offset + sg->length > PAGE_SIZE) | |
571 | return -EINVAL; | |
572 | } | |
573 | ||
574 | return 0; | |
575 | } | |
576 | ||
577 | static void scsiback_disconnect(struct vscsibk_info *info) | |
578 | { | |
579 | wait_event(info->waiting_to_free, | |
580 | atomic_read(&info->nr_unreplied_reqs) == 0); | |
581 | ||
582 | unbind_from_irqhandler(info->irq, info); | |
583 | info->irq = 0; | |
584 | xenbus_unmap_ring_vfree(info->dev, info->ring.sring); | |
585 | } | |
586 | ||
587 | static void scsiback_device_action(struct vscsibk_pend *pending_req, | |
588 | enum tcm_tmreq_table act, int tag) | |
589 | { | |
590 | int rc, err = FAILED; | |
591 | struct scsiback_tpg *tpg = pending_req->v2p->tpg; | |
592 | struct se_cmd *se_cmd = &pending_req->se_cmd; | |
593 | struct scsiback_tmr *tmr; | |
594 | ||
595 | tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL); | |
596 | if (!tmr) | |
597 | goto out; | |
598 | ||
599 | init_waitqueue_head(&tmr->tmr_wait); | |
600 | ||
601 | transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo, | |
68d81f40 | 602 | tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, TCM_SIMPLE_TAG, |
d9d660f6 JG |
603 | &pending_req->sense_buffer[0]); |
604 | ||
605 | rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL); | |
606 | if (rc < 0) | |
607 | goto out; | |
608 | ||
609 | se_cmd->se_tmr_req->ref_task_tag = tag; | |
610 | ||
611 | if (transport_lookup_tmr_lun(se_cmd, pending_req->v2p->lun) < 0) | |
612 | goto out; | |
613 | ||
614 | transport_generic_handle_tmr(se_cmd); | |
615 | wait_event(tmr->tmr_wait, atomic_read(&tmr->tmr_complete)); | |
616 | ||
617 | err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? | |
618 | SUCCESS : FAILED; | |
619 | ||
620 | out: | |
621 | if (tmr) { | |
622 | transport_generic_free_cmd(&pending_req->se_cmd, 1); | |
623 | kfree(tmr); | |
624 | } | |
625 | ||
626 | scsiback_do_resp_with_sense(NULL, err, 0, pending_req); | |
627 | ||
628 | kmem_cache_free(scsiback_cachep, pending_req); | |
629 | } | |
630 | ||
631 | /* | |
632 | Perform virtual to physical translation | |
633 | */ | |
634 | static struct v2p_entry *scsiback_do_translation(struct vscsibk_info *info, | |
635 | struct ids_tuple *v) | |
636 | { | |
637 | struct v2p_entry *entry; | |
638 | struct list_head *head = &(info->v2p_entry_lists); | |
639 | unsigned long flags; | |
640 | ||
641 | spin_lock_irqsave(&info->v2p_lock, flags); | |
642 | list_for_each_entry(entry, head, l) { | |
643 | if ((entry->v.chn == v->chn) && | |
644 | (entry->v.tgt == v->tgt) && | |
645 | (entry->v.lun == v->lun)) { | |
646 | kref_get(&entry->kref); | |
647 | goto out; | |
648 | } | |
649 | } | |
650 | entry = NULL; | |
651 | ||
652 | out: | |
653 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
654 | return entry; | |
655 | } | |
656 | ||
657 | static int prepare_pending_reqs(struct vscsibk_info *info, | |
658 | struct vscsiif_request *ring_req, | |
659 | struct vscsibk_pend *pending_req) | |
660 | { | |
661 | struct v2p_entry *v2p; | |
662 | struct ids_tuple vir; | |
663 | ||
664 | pending_req->rqid = ring_req->rqid; | |
665 | pending_req->info = info; | |
666 | ||
667 | vir.chn = ring_req->channel; | |
668 | vir.tgt = ring_req->id; | |
669 | vir.lun = ring_req->lun; | |
670 | ||
671 | v2p = scsiback_do_translation(info, &vir); | |
672 | if (!v2p) { | |
673 | pending_req->v2p = NULL; | |
78574878 TC |
674 | pr_debug("the v2p of (chn:%d, tgt:%d, lun:%d) doesn't exist.\n", |
675 | vir.chn, vir.tgt, vir.lun); | |
d9d660f6 JG |
676 | return -ENODEV; |
677 | } | |
678 | pending_req->v2p = v2p; | |
679 | ||
680 | /* request range check from frontend */ | |
681 | pending_req->sc_data_direction = ring_req->sc_data_direction; | |
682 | if ((pending_req->sc_data_direction != DMA_BIDIRECTIONAL) && | |
683 | (pending_req->sc_data_direction != DMA_TO_DEVICE) && | |
684 | (pending_req->sc_data_direction != DMA_FROM_DEVICE) && | |
685 | (pending_req->sc_data_direction != DMA_NONE)) { | |
78574878 | 686 | pr_debug("invalid parameter data_dir = %d\n", |
d9d660f6 JG |
687 | pending_req->sc_data_direction); |
688 | return -EINVAL; | |
689 | } | |
690 | ||
691 | pending_req->cmd_len = ring_req->cmd_len; | |
692 | if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) { | |
78574878 | 693 | pr_debug("invalid parameter cmd_len = %d\n", |
d9d660f6 JG |
694 | pending_req->cmd_len); |
695 | return -EINVAL; | |
696 | } | |
697 | memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len); | |
698 | ||
699 | return 0; | |
700 | } | |
701 | ||
702 | static int scsiback_do_cmd_fn(struct vscsibk_info *info) | |
703 | { | |
704 | struct vscsiif_back_ring *ring = &info->ring; | |
facb5732 | 705 | struct vscsiif_request ring_req; |
d9d660f6 JG |
706 | struct vscsibk_pend *pending_req; |
707 | RING_IDX rc, rp; | |
708 | int err, more_to_do; | |
709 | uint32_t result; | |
d9d660f6 JG |
710 | |
711 | rc = ring->req_cons; | |
712 | rp = ring->sring->req_prod; | |
713 | rmb(); /* guest system is accessing ring, too */ | |
714 | ||
715 | if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) { | |
716 | rc = ring->rsp_prod_pvt; | |
78574878 | 717 | pr_warn("Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n", |
d9d660f6 JG |
718 | info->domid, rp, rc, rp - rc); |
719 | info->ring_error = 1; | |
720 | return 0; | |
721 | } | |
722 | ||
723 | while ((rc != rp)) { | |
724 | if (RING_REQUEST_CONS_OVERFLOW(ring, rc)) | |
725 | break; | |
726 | pending_req = kmem_cache_alloc(scsiback_cachep, GFP_KERNEL); | |
727 | if (!pending_req) | |
728 | return 1; | |
729 | ||
facb5732 | 730 | ring_req = *RING_GET_REQUEST(ring, rc); |
d9d660f6 JG |
731 | ring->req_cons = ++rc; |
732 | ||
facb5732 | 733 | err = prepare_pending_reqs(info, &ring_req, pending_req); |
d9d660f6 JG |
734 | if (err) { |
735 | switch (err) { | |
736 | case -ENODEV: | |
737 | result = DID_NO_CONNECT; | |
738 | break; | |
739 | default: | |
740 | result = DRIVER_ERROR; | |
741 | break; | |
742 | } | |
743 | scsiback_do_resp_with_sense(NULL, result << 24, 0, | |
744 | pending_req); | |
745 | kmem_cache_free(scsiback_cachep, pending_req); | |
746 | return 1; | |
747 | } | |
748 | ||
facb5732 | 749 | switch (ring_req.act) { |
d9d660f6 | 750 | case VSCSIIF_ACT_SCSI_CDB: |
facb5732 | 751 | if (scsiback_gnttab_data_map(&ring_req, pending_req)) { |
d9d660f6 JG |
752 | scsiback_fast_flush_area(pending_req); |
753 | scsiback_do_resp_with_sense(NULL, | |
754 | DRIVER_ERROR << 24, 0, pending_req); | |
755 | kmem_cache_free(scsiback_cachep, pending_req); | |
756 | } else { | |
757 | scsiback_cmd_exec(pending_req); | |
758 | } | |
759 | break; | |
760 | case VSCSIIF_ACT_SCSI_ABORT: | |
761 | scsiback_device_action(pending_req, TMR_ABORT_TASK, | |
facb5732 | 762 | ring_req.ref_rqid); |
d9d660f6 JG |
763 | break; |
764 | case VSCSIIF_ACT_SCSI_RESET: | |
765 | scsiback_device_action(pending_req, TMR_LUN_RESET, 0); | |
766 | break; | |
767 | default: | |
78574878 | 768 | pr_err_ratelimited("invalid request\n"); |
d9d660f6 JG |
769 | scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24, |
770 | 0, pending_req); | |
771 | kmem_cache_free(scsiback_cachep, pending_req); | |
772 | break; | |
773 | } | |
774 | ||
775 | /* Yield point for this unbounded loop. */ | |
776 | cond_resched(); | |
777 | } | |
778 | ||
779 | RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do); | |
780 | return more_to_do; | |
781 | } | |
782 | ||
783 | static irqreturn_t scsiback_irq_fn(int irq, void *dev_id) | |
784 | { | |
785 | struct vscsibk_info *info = dev_id; | |
786 | ||
787 | if (info->ring_error) | |
788 | return IRQ_HANDLED; | |
789 | ||
790 | while (scsiback_do_cmd_fn(info)) | |
791 | cond_resched(); | |
792 | ||
793 | return IRQ_HANDLED; | |
794 | } | |
795 | ||
796 | static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref, | |
797 | evtchn_port_t evtchn) | |
798 | { | |
799 | void *area; | |
800 | struct vscsiif_sring *sring; | |
801 | int err; | |
802 | ||
803 | if (info->irq) | |
804 | return -1; | |
805 | ||
ccc9d90a | 806 | err = xenbus_map_ring_valloc(info->dev, &ring_ref, 1, &area); |
d9d660f6 JG |
807 | if (err) |
808 | return err; | |
809 | ||
810 | sring = (struct vscsiif_sring *)area; | |
811 | BACK_RING_INIT(&info->ring, sring, PAGE_SIZE); | |
812 | ||
813 | err = bind_interdomain_evtchn_to_irq(info->domid, evtchn); | |
814 | if (err < 0) | |
815 | goto unmap_page; | |
816 | ||
817 | info->irq = err; | |
818 | ||
819 | err = request_threaded_irq(info->irq, NULL, scsiback_irq_fn, | |
820 | IRQF_ONESHOT, "vscsiif-backend", info); | |
821 | if (err) | |
822 | goto free_irq; | |
823 | ||
824 | return 0; | |
825 | ||
826 | free_irq: | |
827 | unbind_from_irqhandler(info->irq, info); | |
828 | info->irq = 0; | |
829 | unmap_page: | |
830 | xenbus_unmap_ring_vfree(info->dev, area); | |
831 | ||
832 | return err; | |
833 | } | |
834 | ||
835 | static int scsiback_map(struct vscsibk_info *info) | |
836 | { | |
837 | struct xenbus_device *dev = info->dev; | |
838 | unsigned int ring_ref, evtchn; | |
839 | int err; | |
840 | ||
841 | err = xenbus_gather(XBT_NIL, dev->otherend, | |
842 | "ring-ref", "%u", &ring_ref, | |
843 | "event-channel", "%u", &evtchn, NULL); | |
844 | if (err) { | |
845 | xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend); | |
846 | return err; | |
847 | } | |
848 | ||
849 | return scsiback_init_sring(info, ring_ref, evtchn); | |
850 | } | |
851 | ||
852 | /* | |
853 | Add a new translation entry | |
854 | */ | |
855 | static int scsiback_add_translation_entry(struct vscsibk_info *info, | |
856 | char *phy, struct ids_tuple *v) | |
857 | { | |
858 | int err = 0; | |
859 | struct v2p_entry *entry; | |
860 | struct v2p_entry *new; | |
861 | struct list_head *head = &(info->v2p_entry_lists); | |
862 | unsigned long flags; | |
863 | char *lunp; | |
196e2e2a | 864 | unsigned long long unpacked_lun; |
6bb82612 | 865 | struct se_lun *se_lun; |
d9d660f6 JG |
866 | struct scsiback_tpg *tpg_entry, *tpg = NULL; |
867 | char *error = "doesn't exist"; | |
868 | ||
869 | lunp = strrchr(phy, ':'); | |
870 | if (!lunp) { | |
78574878 | 871 | pr_err("illegal format of physical device %s\n", phy); |
d9d660f6 JG |
872 | return -EINVAL; |
873 | } | |
874 | *lunp = 0; | |
875 | lunp++; | |
196e2e2a HR |
876 | err = kstrtoull(lunp, 10, &unpacked_lun); |
877 | if (err < 0) { | |
78574878 | 878 | pr_err("lun number not valid: %s\n", lunp); |
196e2e2a | 879 | return err; |
d9d660f6 JG |
880 | } |
881 | ||
882 | mutex_lock(&scsiback_mutex); | |
883 | list_for_each_entry(tpg_entry, &scsiback_list, tv_tpg_list) { | |
884 | if (!strcmp(phy, tpg_entry->tport->tport_name) || | |
885 | !strcmp(phy, tpg_entry->param_alias)) { | |
6bb82612 NB |
886 | mutex_lock(&tpg_entry->se_tpg.tpg_lun_mutex); |
887 | hlist_for_each_entry(se_lun, &tpg_entry->se_tpg.tpg_lun_hlist, link) { | |
888 | if (se_lun->unpacked_lun == unpacked_lun) { | |
889 | if (!tpg_entry->tpg_nexus) | |
890 | error = "nexus undefined"; | |
891 | else | |
892 | tpg = tpg_entry; | |
893 | break; | |
894 | } | |
d9d660f6 | 895 | } |
6bb82612 | 896 | mutex_unlock(&tpg_entry->se_tpg.tpg_lun_mutex); |
d9d660f6 JG |
897 | break; |
898 | } | |
899 | } | |
900 | if (tpg) { | |
901 | mutex_lock(&tpg->tv_tpg_mutex); | |
902 | tpg->tv_tpg_fe_count++; | |
903 | mutex_unlock(&tpg->tv_tpg_mutex); | |
904 | } | |
905 | mutex_unlock(&scsiback_mutex); | |
906 | ||
907 | if (!tpg) { | |
0fb1f14e | 908 | pr_err("%s:%llu %s\n", phy, unpacked_lun, error); |
d9d660f6 JG |
909 | return -ENODEV; |
910 | } | |
911 | ||
912 | new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL); | |
913 | if (new == NULL) { | |
914 | err = -ENOMEM; | |
915 | goto out_free; | |
916 | } | |
917 | ||
918 | spin_lock_irqsave(&info->v2p_lock, flags); | |
919 | ||
920 | /* Check double assignment to identical virtual ID */ | |
921 | list_for_each_entry(entry, head, l) { | |
922 | if ((entry->v.chn == v->chn) && | |
923 | (entry->v.tgt == v->tgt) && | |
924 | (entry->v.lun == v->lun)) { | |
78574878 | 925 | pr_warn("Virtual ID is already used. Assignment was not performed.\n"); |
d9d660f6 JG |
926 | err = -EEXIST; |
927 | goto out; | |
928 | } | |
929 | ||
930 | } | |
931 | ||
932 | /* Create a new translation entry and add to the list */ | |
933 | kref_init(&new->kref); | |
934 | new->v = *v; | |
935 | new->tpg = tpg; | |
6bb82612 | 936 | new->lun = unpacked_lun; |
d9d660f6 JG |
937 | list_add_tail(&new->l, head); |
938 | ||
939 | out: | |
940 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
941 | ||
942 | out_free: | |
943 | mutex_lock(&tpg->tv_tpg_mutex); | |
944 | tpg->tv_tpg_fe_count--; | |
945 | mutex_unlock(&tpg->tv_tpg_mutex); | |
946 | ||
947 | if (err) | |
948 | kfree(new); | |
949 | ||
950 | return err; | |
951 | } | |
952 | ||
953 | static void __scsiback_del_translation_entry(struct v2p_entry *entry) | |
954 | { | |
955 | list_del(&entry->l); | |
956 | kref_put(&entry->kref, scsiback_free_translation_entry); | |
957 | } | |
958 | ||
959 | /* | |
960 | Delete the translation entry specfied | |
961 | */ | |
962 | static int scsiback_del_translation_entry(struct vscsibk_info *info, | |
963 | struct ids_tuple *v) | |
964 | { | |
965 | struct v2p_entry *entry; | |
966 | struct list_head *head = &(info->v2p_entry_lists); | |
967 | unsigned long flags; | |
968 | ||
969 | spin_lock_irqsave(&info->v2p_lock, flags); | |
970 | /* Find out the translation entry specified */ | |
971 | list_for_each_entry(entry, head, l) { | |
972 | if ((entry->v.chn == v->chn) && | |
973 | (entry->v.tgt == v->tgt) && | |
974 | (entry->v.lun == v->lun)) { | |
975 | goto found; | |
976 | } | |
977 | } | |
978 | ||
979 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
980 | return 1; | |
981 | ||
982 | found: | |
983 | /* Delete the translation entry specfied */ | |
984 | __scsiback_del_translation_entry(entry); | |
985 | ||
986 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
987 | return 0; | |
988 | } | |
989 | ||
990 | static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state, | |
169e6cf0 | 991 | char *phy, struct ids_tuple *vir, int try) |
d9d660f6 JG |
992 | { |
993 | if (!scsiback_add_translation_entry(info, phy, vir)) { | |
994 | if (xenbus_printf(XBT_NIL, info->dev->nodename, state, | |
995 | "%d", XenbusStateInitialised)) { | |
78574878 | 996 | pr_err("xenbus_printf error %s\n", state); |
d9d660f6 JG |
997 | scsiback_del_translation_entry(info, vir); |
998 | } | |
169e6cf0 | 999 | } else if (!try) { |
d9d660f6 JG |
1000 | xenbus_printf(XBT_NIL, info->dev->nodename, state, |
1001 | "%d", XenbusStateClosed); | |
1002 | } | |
1003 | } | |
1004 | ||
1005 | static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state, | |
1006 | struct ids_tuple *vir) | |
1007 | { | |
1008 | if (!scsiback_del_translation_entry(info, vir)) { | |
1009 | if (xenbus_printf(XBT_NIL, info->dev->nodename, state, | |
1010 | "%d", XenbusStateClosed)) | |
78574878 | 1011 | pr_err("xenbus_printf error %s\n", state); |
d9d660f6 JG |
1012 | } |
1013 | } | |
1014 | ||
1015 | #define VSCSIBACK_OP_ADD_OR_DEL_LUN 1 | |
1016 | #define VSCSIBACK_OP_UPDATEDEV_STATE 2 | |
1017 | ||
1018 | static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op, | |
1019 | char *ent) | |
1020 | { | |
1021 | int err; | |
1022 | struct ids_tuple vir; | |
1023 | char *val; | |
1024 | int device_state; | |
1025 | char phy[VSCSI_NAMELEN]; | |
1026 | char str[64]; | |
1027 | char state[64]; | |
1028 | struct xenbus_device *dev = info->dev; | |
1029 | ||
1030 | /* read status */ | |
1031 | snprintf(state, sizeof(state), "vscsi-devs/%s/state", ent); | |
1032 | err = xenbus_scanf(XBT_NIL, dev->nodename, state, "%u", &device_state); | |
1033 | if (XENBUS_EXIST_ERR(err)) | |
1034 | return; | |
1035 | ||
1036 | /* physical SCSI device */ | |
1037 | snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent); | |
1038 | val = xenbus_read(XBT_NIL, dev->nodename, str, NULL); | |
1039 | if (IS_ERR(val)) { | |
1040 | xenbus_printf(XBT_NIL, dev->nodename, state, | |
1041 | "%d", XenbusStateClosed); | |
1042 | return; | |
1043 | } | |
1044 | strlcpy(phy, val, VSCSI_NAMELEN); | |
1045 | kfree(val); | |
1046 | ||
1047 | /* virtual SCSI device */ | |
1048 | snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", ent); | |
1049 | err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u", | |
1050 | &vir.hst, &vir.chn, &vir.tgt, &vir.lun); | |
1051 | if (XENBUS_EXIST_ERR(err)) { | |
1052 | xenbus_printf(XBT_NIL, dev->nodename, state, | |
1053 | "%d", XenbusStateClosed); | |
1054 | return; | |
1055 | } | |
1056 | ||
1057 | switch (op) { | |
1058 | case VSCSIBACK_OP_ADD_OR_DEL_LUN: | |
169e6cf0 JG |
1059 | switch (device_state) { |
1060 | case XenbusStateInitialising: | |
1061 | scsiback_do_add_lun(info, state, phy, &vir, 0); | |
1062 | break; | |
1063 | case XenbusStateConnected: | |
1064 | scsiback_do_add_lun(info, state, phy, &vir, 1); | |
1065 | break; | |
1066 | case XenbusStateClosing: | |
d9d660f6 | 1067 | scsiback_do_del_lun(info, state, &vir); |
169e6cf0 JG |
1068 | break; |
1069 | default: | |
1070 | break; | |
1071 | } | |
d9d660f6 JG |
1072 | break; |
1073 | ||
1074 | case VSCSIBACK_OP_UPDATEDEV_STATE: | |
1075 | if (device_state == XenbusStateInitialised) { | |
1076 | /* modify vscsi-devs/dev-x/state */ | |
1077 | if (xenbus_printf(XBT_NIL, dev->nodename, state, | |
1078 | "%d", XenbusStateConnected)) { | |
78574878 | 1079 | pr_err("xenbus_printf error %s\n", str); |
d9d660f6 JG |
1080 | scsiback_del_translation_entry(info, &vir); |
1081 | xenbus_printf(XBT_NIL, dev->nodename, state, | |
1082 | "%d", XenbusStateClosed); | |
1083 | } | |
1084 | } | |
1085 | break; | |
78574878 | 1086 | /* When it is necessary, processing is added here. */ |
d9d660f6 JG |
1087 | default: |
1088 | break; | |
1089 | } | |
1090 | } | |
1091 | ||
1092 | static void scsiback_do_lun_hotplug(struct vscsibk_info *info, int op) | |
1093 | { | |
1094 | int i; | |
1095 | char **dir; | |
1096 | unsigned int ndir = 0; | |
1097 | ||
1098 | dir = xenbus_directory(XBT_NIL, info->dev->nodename, "vscsi-devs", | |
1099 | &ndir); | |
1100 | if (IS_ERR(dir)) | |
1101 | return; | |
1102 | ||
1103 | for (i = 0; i < ndir; i++) | |
1104 | scsiback_do_1lun_hotplug(info, op, dir[i]); | |
1105 | ||
1106 | kfree(dir); | |
1107 | } | |
1108 | ||
1109 | static void scsiback_frontend_changed(struct xenbus_device *dev, | |
1110 | enum xenbus_state frontend_state) | |
1111 | { | |
1112 | struct vscsibk_info *info = dev_get_drvdata(&dev->dev); | |
1113 | ||
1114 | switch (frontend_state) { | |
1115 | case XenbusStateInitialising: | |
1116 | break; | |
1117 | ||
1118 | case XenbusStateInitialised: | |
1119 | if (scsiback_map(info)) | |
1120 | break; | |
1121 | ||
1122 | scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); | |
1123 | xenbus_switch_state(dev, XenbusStateConnected); | |
1124 | break; | |
1125 | ||
1126 | case XenbusStateConnected: | |
1127 | scsiback_do_lun_hotplug(info, VSCSIBACK_OP_UPDATEDEV_STATE); | |
1128 | ||
1129 | if (dev->state == XenbusStateConnected) | |
1130 | break; | |
1131 | ||
1132 | xenbus_switch_state(dev, XenbusStateConnected); | |
1133 | break; | |
1134 | ||
1135 | case XenbusStateClosing: | |
1136 | if (info->irq) | |
1137 | scsiback_disconnect(info); | |
1138 | ||
1139 | xenbus_switch_state(dev, XenbusStateClosing); | |
1140 | break; | |
1141 | ||
1142 | case XenbusStateClosed: | |
1143 | xenbus_switch_state(dev, XenbusStateClosed); | |
1144 | if (xenbus_dev_is_online(dev)) | |
1145 | break; | |
1146 | /* fall through if not online */ | |
1147 | case XenbusStateUnknown: | |
1148 | device_unregister(&dev->dev); | |
1149 | break; | |
1150 | ||
1151 | case XenbusStateReconfiguring: | |
1152 | scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); | |
1153 | xenbus_switch_state(dev, XenbusStateReconfigured); | |
1154 | ||
1155 | break; | |
1156 | ||
1157 | default: | |
1158 | xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", | |
1159 | frontend_state); | |
1160 | break; | |
1161 | } | |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | Release the translation entry specfied | |
1166 | */ | |
1167 | static void scsiback_release_translation_entry(struct vscsibk_info *info) | |
1168 | { | |
1169 | struct v2p_entry *entry, *tmp; | |
1170 | struct list_head *head = &(info->v2p_entry_lists); | |
1171 | unsigned long flags; | |
1172 | ||
1173 | spin_lock_irqsave(&info->v2p_lock, flags); | |
1174 | ||
1175 | list_for_each_entry_safe(entry, tmp, head, l) | |
1176 | __scsiback_del_translation_entry(entry); | |
1177 | ||
1178 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
1179 | } | |
1180 | ||
1181 | static int scsiback_remove(struct xenbus_device *dev) | |
1182 | { | |
1183 | struct vscsibk_info *info = dev_get_drvdata(&dev->dev); | |
1184 | ||
1185 | if (info->irq) | |
1186 | scsiback_disconnect(info); | |
1187 | ||
1188 | scsiback_release_translation_entry(info); | |
1189 | ||
1190 | dev_set_drvdata(&dev->dev, NULL); | |
1191 | ||
1192 | return 0; | |
1193 | } | |
1194 | ||
1195 | static int scsiback_probe(struct xenbus_device *dev, | |
1196 | const struct xenbus_device_id *id) | |
1197 | { | |
1198 | int err; | |
1199 | ||
1200 | struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info), | |
1201 | GFP_KERNEL); | |
1202 | ||
78574878 | 1203 | pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id); |
d9d660f6 JG |
1204 | |
1205 | if (!info) { | |
1206 | xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure"); | |
1207 | return -ENOMEM; | |
1208 | } | |
1209 | info->dev = dev; | |
1210 | dev_set_drvdata(&dev->dev, info); | |
1211 | ||
1212 | info->domid = dev->otherend_id; | |
1213 | spin_lock_init(&info->ring_lock); | |
1214 | info->ring_error = 0; | |
1215 | atomic_set(&info->nr_unreplied_reqs, 0); | |
1216 | init_waitqueue_head(&info->waiting_to_free); | |
1217 | info->dev = dev; | |
1218 | info->irq = 0; | |
1219 | INIT_LIST_HEAD(&info->v2p_entry_lists); | |
1220 | spin_lock_init(&info->v2p_lock); | |
1221 | ||
1222 | err = xenbus_printf(XBT_NIL, dev->nodename, "feature-sg-grant", "%u", | |
1223 | SG_ALL); | |
1224 | if (err) | |
1225 | xenbus_dev_error(dev, err, "writing feature-sg-grant"); | |
1226 | ||
1227 | err = xenbus_switch_state(dev, XenbusStateInitWait); | |
1228 | if (err) | |
1229 | goto fail; | |
1230 | ||
1231 | return 0; | |
1232 | ||
1233 | fail: | |
78574878 | 1234 | pr_warn("%s failed\n", __func__); |
d9d660f6 JG |
1235 | scsiback_remove(dev); |
1236 | ||
1237 | return err; | |
1238 | } | |
1239 | ||
1240 | static char *scsiback_dump_proto_id(struct scsiback_tport *tport) | |
1241 | { | |
1242 | switch (tport->tport_proto_id) { | |
1243 | case SCSI_PROTOCOL_SAS: | |
1244 | return "SAS"; | |
1245 | case SCSI_PROTOCOL_FCP: | |
1246 | return "FCP"; | |
1247 | case SCSI_PROTOCOL_ISCSI: | |
1248 | return "iSCSI"; | |
1249 | default: | |
1250 | break; | |
1251 | } | |
1252 | ||
1253 | return "Unknown"; | |
1254 | } | |
1255 | ||
d9d660f6 JG |
1256 | static char *scsiback_get_fabric_wwn(struct se_portal_group *se_tpg) |
1257 | { | |
1258 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1259 | struct scsiback_tpg, se_tpg); | |
1260 | struct scsiback_tport *tport = tpg->tport; | |
1261 | ||
1262 | return &tport->tport_name[0]; | |
1263 | } | |
1264 | ||
1265 | static u16 scsiback_get_tag(struct se_portal_group *se_tpg) | |
1266 | { | |
1267 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1268 | struct scsiback_tpg, se_tpg); | |
1269 | return tpg->tport_tpgt; | |
1270 | } | |
1271 | ||
d9d660f6 JG |
1272 | static struct se_wwn * |
1273 | scsiback_make_tport(struct target_fabric_configfs *tf, | |
1274 | struct config_group *group, | |
1275 | const char *name) | |
1276 | { | |
1277 | struct scsiback_tport *tport; | |
1278 | char *ptr; | |
1279 | u64 wwpn = 0; | |
1280 | int off = 0; | |
1281 | ||
1282 | tport = kzalloc(sizeof(struct scsiback_tport), GFP_KERNEL); | |
1283 | if (!tport) | |
1284 | return ERR_PTR(-ENOMEM); | |
1285 | ||
1286 | tport->tport_wwpn = wwpn; | |
1287 | /* | |
1288 | * Determine the emulated Protocol Identifier and Target Port Name | |
1289 | * based on the incoming configfs directory name. | |
1290 | */ | |
1291 | ptr = strstr(name, "naa."); | |
1292 | if (ptr) { | |
1293 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
1294 | goto check_len; | |
1295 | } | |
1296 | ptr = strstr(name, "fc."); | |
1297 | if (ptr) { | |
1298 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
1299 | off = 3; /* Skip over "fc." */ | |
1300 | goto check_len; | |
1301 | } | |
1302 | ptr = strstr(name, "iqn."); | |
1303 | if (ptr) { | |
1304 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
1305 | goto check_len; | |
1306 | } | |
1307 | ||
1308 | pr_err("Unable to locate prefix for emulated Target Port: %s\n", name); | |
1309 | kfree(tport); | |
1310 | return ERR_PTR(-EINVAL); | |
1311 | ||
1312 | check_len: | |
1313 | if (strlen(name) >= VSCSI_NAMELEN) { | |
1314 | pr_err("Emulated %s Address: %s, exceeds max: %d\n", name, | |
1315 | scsiback_dump_proto_id(tport), VSCSI_NAMELEN); | |
1316 | kfree(tport); | |
1317 | return ERR_PTR(-EINVAL); | |
1318 | } | |
1319 | snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]); | |
1320 | ||
78574878 | 1321 | pr_debug("Allocated emulated Target %s Address: %s\n", |
d9d660f6 JG |
1322 | scsiback_dump_proto_id(tport), name); |
1323 | ||
1324 | return &tport->tport_wwn; | |
1325 | } | |
1326 | ||
1327 | static void scsiback_drop_tport(struct se_wwn *wwn) | |
1328 | { | |
1329 | struct scsiback_tport *tport = container_of(wwn, | |
1330 | struct scsiback_tport, tport_wwn); | |
1331 | ||
78574878 | 1332 | pr_debug("Deallocating emulated Target %s Address: %s\n", |
d9d660f6 JG |
1333 | scsiback_dump_proto_id(tport), tport->tport_name); |
1334 | ||
1335 | kfree(tport); | |
1336 | } | |
1337 | ||
d9d660f6 JG |
1338 | static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg) |
1339 | { | |
1340 | return 1; | |
1341 | } | |
1342 | ||
1343 | static int scsiback_check_stop_free(struct se_cmd *se_cmd) | |
1344 | { | |
1345 | /* | |
78574878 TC |
1346 | * Do not release struct se_cmd's containing a valid TMR pointer. |
1347 | * These will be released directly in scsiback_device_action() | |
d9d660f6 JG |
1348 | * with transport_generic_free_cmd(). |
1349 | */ | |
1350 | if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) | |
1351 | return 0; | |
1352 | ||
1353 | transport_generic_free_cmd(se_cmd, 0); | |
1354 | return 1; | |
1355 | } | |
1356 | ||
1357 | static void scsiback_release_cmd(struct se_cmd *se_cmd) | |
1358 | { | |
1359 | struct vscsibk_pend *pending_req = container_of(se_cmd, | |
1360 | struct vscsibk_pend, se_cmd); | |
1361 | ||
1362 | kmem_cache_free(scsiback_cachep, pending_req); | |
1363 | } | |
1364 | ||
1365 | static int scsiback_shutdown_session(struct se_session *se_sess) | |
1366 | { | |
1367 | return 0; | |
1368 | } | |
1369 | ||
1370 | static void scsiback_close_session(struct se_session *se_sess) | |
1371 | { | |
1372 | } | |
1373 | ||
1374 | static u32 scsiback_sess_get_index(struct se_session *se_sess) | |
1375 | { | |
1376 | return 0; | |
1377 | } | |
1378 | ||
1379 | static int scsiback_write_pending(struct se_cmd *se_cmd) | |
1380 | { | |
1381 | /* Go ahead and process the write immediately */ | |
1382 | target_execute_cmd(se_cmd); | |
1383 | ||
1384 | return 0; | |
1385 | } | |
1386 | ||
1387 | static int scsiback_write_pending_status(struct se_cmd *se_cmd) | |
1388 | { | |
1389 | return 0; | |
1390 | } | |
1391 | ||
1392 | static void scsiback_set_default_node_attrs(struct se_node_acl *nacl) | |
1393 | { | |
1394 | } | |
1395 | ||
d9d660f6 JG |
1396 | static int scsiback_get_cmd_state(struct se_cmd *se_cmd) |
1397 | { | |
1398 | return 0; | |
1399 | } | |
1400 | ||
1401 | static int scsiback_queue_data_in(struct se_cmd *se_cmd) | |
1402 | { | |
1403 | struct vscsibk_pend *pending_req = container_of(se_cmd, | |
1404 | struct vscsibk_pend, se_cmd); | |
1405 | ||
1406 | pending_req->result = SAM_STAT_GOOD; | |
1407 | scsiback_cmd_done(pending_req); | |
1408 | return 0; | |
1409 | } | |
1410 | ||
1411 | static int scsiback_queue_status(struct se_cmd *se_cmd) | |
1412 | { | |
1413 | struct vscsibk_pend *pending_req = container_of(se_cmd, | |
1414 | struct vscsibk_pend, se_cmd); | |
1415 | ||
1416 | if (se_cmd->sense_buffer && | |
1417 | ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || | |
1418 | (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) | |
1419 | pending_req->result = (DRIVER_SENSE << 24) | | |
1420 | SAM_STAT_CHECK_CONDITION; | |
1421 | else | |
1422 | pending_req->result = se_cmd->scsi_status; | |
1423 | ||
1424 | scsiback_cmd_done(pending_req); | |
1425 | return 0; | |
1426 | } | |
1427 | ||
1428 | static void scsiback_queue_tm_rsp(struct se_cmd *se_cmd) | |
1429 | { | |
1430 | struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; | |
1431 | struct scsiback_tmr *tmr = se_tmr->fabric_tmr_ptr; | |
1432 | ||
1433 | atomic_set(&tmr->tmr_complete, 1); | |
1434 | wake_up(&tmr->tmr_wait); | |
1435 | } | |
1436 | ||
1437 | static void scsiback_aborted_task(struct se_cmd *se_cmd) | |
1438 | { | |
1439 | } | |
1440 | ||
1441 | static ssize_t scsiback_tpg_param_show_alias(struct se_portal_group *se_tpg, | |
1442 | char *page) | |
1443 | { | |
1444 | struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, | |
1445 | se_tpg); | |
1446 | ssize_t rb; | |
1447 | ||
1448 | mutex_lock(&tpg->tv_tpg_mutex); | |
1449 | rb = snprintf(page, PAGE_SIZE, "%s\n", tpg->param_alias); | |
1450 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1451 | ||
1452 | return rb; | |
1453 | } | |
1454 | ||
1455 | static ssize_t scsiback_tpg_param_store_alias(struct se_portal_group *se_tpg, | |
1456 | const char *page, size_t count) | |
1457 | { | |
1458 | struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, | |
1459 | se_tpg); | |
1460 | int len; | |
1461 | ||
1462 | if (strlen(page) >= VSCSI_NAMELEN) { | |
1463 | pr_err("param alias: %s, exceeds max: %d\n", page, | |
1464 | VSCSI_NAMELEN); | |
1465 | return -EINVAL; | |
1466 | } | |
1467 | ||
1468 | mutex_lock(&tpg->tv_tpg_mutex); | |
1469 | len = snprintf(tpg->param_alias, VSCSI_NAMELEN, "%s", page); | |
1470 | if (tpg->param_alias[len - 1] == '\n') | |
1471 | tpg->param_alias[len - 1] = '\0'; | |
1472 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1473 | ||
1474 | return count; | |
1475 | } | |
1476 | ||
1477 | TF_TPG_PARAM_ATTR(scsiback, alias, S_IRUGO | S_IWUSR); | |
1478 | ||
1479 | static struct configfs_attribute *scsiback_param_attrs[] = { | |
1480 | &scsiback_tpg_param_alias.attr, | |
1481 | NULL, | |
1482 | }; | |
1483 | ||
1484 | static int scsiback_make_nexus(struct scsiback_tpg *tpg, | |
1485 | const char *name) | |
1486 | { | |
1487 | struct se_portal_group *se_tpg; | |
1488 | struct se_session *se_sess; | |
1489 | struct scsiback_nexus *tv_nexus; | |
1490 | ||
1491 | mutex_lock(&tpg->tv_tpg_mutex); | |
1492 | if (tpg->tpg_nexus) { | |
1493 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1494 | pr_debug("tpg->tpg_nexus already exists\n"); | |
1495 | return -EEXIST; | |
1496 | } | |
1497 | se_tpg = &tpg->se_tpg; | |
1498 | ||
1499 | tv_nexus = kzalloc(sizeof(struct scsiback_nexus), GFP_KERNEL); | |
1500 | if (!tv_nexus) { | |
1501 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1502 | return -ENOMEM; | |
1503 | } | |
1504 | /* | |
78574878 | 1505 | * Initialize the struct se_session pointer |
d9d660f6 JG |
1506 | */ |
1507 | tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL); | |
1508 | if (IS_ERR(tv_nexus->tvn_se_sess)) { | |
1509 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1510 | kfree(tv_nexus); | |
1511 | return -ENOMEM; | |
1512 | } | |
1513 | se_sess = tv_nexus->tvn_se_sess; | |
1514 | /* | |
1515 | * Since we are running in 'demo mode' this call with generate a | |
1516 | * struct se_node_acl for the scsiback struct se_portal_group with | |
1517 | * the SCSI Initiator port name of the passed configfs group 'name'. | |
1518 | */ | |
1519 | tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( | |
1520 | se_tpg, (unsigned char *)name); | |
1521 | if (!tv_nexus->tvn_se_sess->se_node_acl) { | |
1522 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1523 | pr_debug("core_tpg_check_initiator_node_acl() failed for %s\n", | |
1524 | name); | |
1525 | goto out; | |
1526 | } | |
2f450cc1 BVA |
1527 | /* Now register the TCM pvscsi virtual I_T Nexus as active. */ |
1528 | transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, | |
d9d660f6 JG |
1529 | tv_nexus->tvn_se_sess, tv_nexus); |
1530 | tpg->tpg_nexus = tv_nexus; | |
1531 | ||
1532 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1533 | return 0; | |
1534 | ||
1535 | out: | |
1536 | transport_free_session(se_sess); | |
1537 | kfree(tv_nexus); | |
1538 | return -ENOMEM; | |
1539 | } | |
1540 | ||
1541 | static int scsiback_drop_nexus(struct scsiback_tpg *tpg) | |
1542 | { | |
1543 | struct se_session *se_sess; | |
1544 | struct scsiback_nexus *tv_nexus; | |
1545 | ||
1546 | mutex_lock(&tpg->tv_tpg_mutex); | |
1547 | tv_nexus = tpg->tpg_nexus; | |
1548 | if (!tv_nexus) { | |
1549 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1550 | return -ENODEV; | |
1551 | } | |
1552 | ||
1553 | se_sess = tv_nexus->tvn_se_sess; | |
1554 | if (!se_sess) { | |
1555 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1556 | return -ENODEV; | |
1557 | } | |
1558 | ||
1559 | if (tpg->tv_tpg_port_count != 0) { | |
1560 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1561 | pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG port count: %d\n", | |
1562 | tpg->tv_tpg_port_count); | |
1563 | return -EBUSY; | |
1564 | } | |
1565 | ||
1566 | if (tpg->tv_tpg_fe_count != 0) { | |
1567 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1568 | pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG frontend count: %d\n", | |
1569 | tpg->tv_tpg_fe_count); | |
1570 | return -EBUSY; | |
1571 | } | |
1572 | ||
78574878 | 1573 | pr_debug("Removing I_T Nexus to emulated %s Initiator Port: %s\n", |
d9d660f6 JG |
1574 | scsiback_dump_proto_id(tpg->tport), |
1575 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
1576 | ||
1577 | /* | |
1578 | * Release the SCSI I_T Nexus to the emulated xen-pvscsi Target Port | |
1579 | */ | |
1580 | transport_deregister_session(tv_nexus->tvn_se_sess); | |
1581 | tpg->tpg_nexus = NULL; | |
1582 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1583 | ||
1584 | kfree(tv_nexus); | |
1585 | return 0; | |
1586 | } | |
1587 | ||
1588 | static ssize_t scsiback_tpg_show_nexus(struct se_portal_group *se_tpg, | |
1589 | char *page) | |
1590 | { | |
1591 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1592 | struct scsiback_tpg, se_tpg); | |
1593 | struct scsiback_nexus *tv_nexus; | |
1594 | ssize_t ret; | |
1595 | ||
1596 | mutex_lock(&tpg->tv_tpg_mutex); | |
1597 | tv_nexus = tpg->tpg_nexus; | |
1598 | if (!tv_nexus) { | |
1599 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1600 | return -ENODEV; | |
1601 | } | |
1602 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1603 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
1604 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1605 | ||
1606 | return ret; | |
1607 | } | |
1608 | ||
1609 | static ssize_t scsiback_tpg_store_nexus(struct se_portal_group *se_tpg, | |
1610 | const char *page, | |
1611 | size_t count) | |
1612 | { | |
1613 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1614 | struct scsiback_tpg, se_tpg); | |
1615 | struct scsiback_tport *tport_wwn = tpg->tport; | |
1616 | unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr; | |
1617 | int ret; | |
1618 | /* | |
78574878 | 1619 | * Shutdown the active I_T nexus if 'NULL' is passed. |
d9d660f6 JG |
1620 | */ |
1621 | if (!strncmp(page, "NULL", 4)) { | |
1622 | ret = scsiback_drop_nexus(tpg); | |
1623 | return (!ret) ? count : ret; | |
1624 | } | |
1625 | /* | |
1626 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1627 | * the fabric protocol_id set in scsiback_make_tport(), and call | |
1628 | * scsiback_make_nexus(). | |
1629 | */ | |
1630 | if (strlen(page) >= VSCSI_NAMELEN) { | |
1631 | pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n", | |
1632 | page, VSCSI_NAMELEN); | |
1633 | return -EINVAL; | |
1634 | } | |
1635 | snprintf(&i_port[0], VSCSI_NAMELEN, "%s", page); | |
1636 | ||
1637 | ptr = strstr(i_port, "naa."); | |
1638 | if (ptr) { | |
1639 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
1640 | pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n", | |
1641 | i_port, scsiback_dump_proto_id(tport_wwn)); | |
1642 | return -EINVAL; | |
1643 | } | |
1644 | port_ptr = &i_port[0]; | |
1645 | goto check_newline; | |
1646 | } | |
1647 | ptr = strstr(i_port, "fc."); | |
1648 | if (ptr) { | |
1649 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
1650 | pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n", | |
1651 | i_port, scsiback_dump_proto_id(tport_wwn)); | |
1652 | return -EINVAL; | |
1653 | } | |
1654 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1655 | goto check_newline; | |
1656 | } | |
1657 | ptr = strstr(i_port, "iqn."); | |
1658 | if (ptr) { | |
1659 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
1660 | pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n", | |
1661 | i_port, scsiback_dump_proto_id(tport_wwn)); | |
1662 | return -EINVAL; | |
1663 | } | |
1664 | port_ptr = &i_port[0]; | |
1665 | goto check_newline; | |
1666 | } | |
1667 | pr_err("Unable to locate prefix for emulated Initiator Port: %s\n", | |
1668 | i_port); | |
1669 | return -EINVAL; | |
1670 | /* | |
1671 | * Clear any trailing newline for the NAA WWN | |
1672 | */ | |
1673 | check_newline: | |
1674 | if (i_port[strlen(i_port) - 1] == '\n') | |
1675 | i_port[strlen(i_port) - 1] = '\0'; | |
1676 | ||
1677 | ret = scsiback_make_nexus(tpg, port_ptr); | |
1678 | if (ret < 0) | |
1679 | return ret; | |
1680 | ||
1681 | return count; | |
1682 | } | |
1683 | ||
1684 | TF_TPG_BASE_ATTR(scsiback, nexus, S_IRUGO | S_IWUSR); | |
1685 | ||
1686 | static struct configfs_attribute *scsiback_tpg_attrs[] = { | |
1687 | &scsiback_tpg_nexus.attr, | |
1688 | NULL, | |
1689 | }; | |
1690 | ||
1691 | static ssize_t | |
1692 | scsiback_wwn_show_attr_version(struct target_fabric_configfs *tf, | |
1693 | char *page) | |
1694 | { | |
1695 | return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on " | |
1696 | UTS_RELEASE"\n", | |
1697 | VSCSI_VERSION, utsname()->sysname, utsname()->machine); | |
1698 | } | |
1699 | ||
1700 | TF_WWN_ATTR_RO(scsiback, version); | |
1701 | ||
1702 | static struct configfs_attribute *scsiback_wwn_attrs[] = { | |
1703 | &scsiback_wwn_version.attr, | |
1704 | NULL, | |
1705 | }; | |
1706 | ||
1707 | static char *scsiback_get_fabric_name(void) | |
1708 | { | |
1709 | return "xen-pvscsi"; | |
1710 | } | |
1711 | ||
1712 | static int scsiback_port_link(struct se_portal_group *se_tpg, | |
1713 | struct se_lun *lun) | |
1714 | { | |
1715 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1716 | struct scsiback_tpg, se_tpg); | |
1717 | ||
1718 | mutex_lock(&tpg->tv_tpg_mutex); | |
1719 | tpg->tv_tpg_port_count++; | |
1720 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1721 | ||
1722 | return 0; | |
1723 | } | |
1724 | ||
1725 | static void scsiback_port_unlink(struct se_portal_group *se_tpg, | |
1726 | struct se_lun *lun) | |
1727 | { | |
1728 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1729 | struct scsiback_tpg, se_tpg); | |
1730 | ||
1731 | mutex_lock(&tpg->tv_tpg_mutex); | |
1732 | tpg->tv_tpg_port_count--; | |
1733 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1734 | } | |
1735 | ||
1736 | static struct se_portal_group * | |
1737 | scsiback_make_tpg(struct se_wwn *wwn, | |
1738 | struct config_group *group, | |
1739 | const char *name) | |
1740 | { | |
1741 | struct scsiback_tport *tport = container_of(wwn, | |
1742 | struct scsiback_tport, tport_wwn); | |
1743 | ||
1744 | struct scsiback_tpg *tpg; | |
495daef9 | 1745 | u16 tpgt; |
d9d660f6 JG |
1746 | int ret; |
1747 | ||
1748 | if (strstr(name, "tpgt_") != name) | |
1749 | return ERR_PTR(-EINVAL); | |
495daef9 DC |
1750 | ret = kstrtou16(name + 5, 10, &tpgt); |
1751 | if (ret) | |
1752 | return ERR_PTR(ret); | |
d9d660f6 JG |
1753 | |
1754 | tpg = kzalloc(sizeof(struct scsiback_tpg), GFP_KERNEL); | |
1755 | if (!tpg) | |
1756 | return ERR_PTR(-ENOMEM); | |
1757 | ||
1758 | mutex_init(&tpg->tv_tpg_mutex); | |
1759 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
1760 | INIT_LIST_HEAD(&tpg->info_list); | |
1761 | tpg->tport = tport; | |
1762 | tpg->tport_tpgt = tpgt; | |
1763 | ||
bc0c94b1 | 1764 | ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
d9d660f6 JG |
1765 | if (ret < 0) { |
1766 | kfree(tpg); | |
1767 | return NULL; | |
1768 | } | |
1769 | mutex_lock(&scsiback_mutex); | |
1770 | list_add_tail(&tpg->tv_tpg_list, &scsiback_list); | |
1771 | mutex_unlock(&scsiback_mutex); | |
1772 | ||
1773 | return &tpg->se_tpg; | |
1774 | } | |
1775 | ||
1776 | static void scsiback_drop_tpg(struct se_portal_group *se_tpg) | |
1777 | { | |
1778 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1779 | struct scsiback_tpg, se_tpg); | |
1780 | ||
1781 | mutex_lock(&scsiback_mutex); | |
1782 | list_del(&tpg->tv_tpg_list); | |
1783 | mutex_unlock(&scsiback_mutex); | |
1784 | /* | |
1785 | * Release the virtual I_T Nexus for this xen-pvscsi TPG | |
1786 | */ | |
1787 | scsiback_drop_nexus(tpg); | |
1788 | /* | |
78574878 | 1789 | * Deregister the se_tpg from TCM. |
d9d660f6 JG |
1790 | */ |
1791 | core_tpg_deregister(se_tpg); | |
1792 | kfree(tpg); | |
1793 | } | |
1794 | ||
1795 | static int scsiback_check_true(struct se_portal_group *se_tpg) | |
1796 | { | |
1797 | return 1; | |
1798 | } | |
1799 | ||
1800 | static int scsiback_check_false(struct se_portal_group *se_tpg) | |
1801 | { | |
1802 | return 0; | |
1803 | } | |
1804 | ||
9ac8928e CH |
1805 | static const struct target_core_fabric_ops scsiback_ops = { |
1806 | .module = THIS_MODULE, | |
1807 | .name = "xen-pvscsi", | |
d9d660f6 | 1808 | .get_fabric_name = scsiback_get_fabric_name, |
d9d660f6 JG |
1809 | .tpg_get_wwn = scsiback_get_fabric_wwn, |
1810 | .tpg_get_tag = scsiback_get_tag, | |
d9d660f6 JG |
1811 | .tpg_check_demo_mode = scsiback_check_true, |
1812 | .tpg_check_demo_mode_cache = scsiback_check_true, | |
1813 | .tpg_check_demo_mode_write_protect = scsiback_check_false, | |
1814 | .tpg_check_prod_mode_write_protect = scsiback_check_false, | |
d9d660f6 JG |
1815 | .tpg_get_inst_index = scsiback_tpg_get_inst_index, |
1816 | .check_stop_free = scsiback_check_stop_free, | |
1817 | .release_cmd = scsiback_release_cmd, | |
d9d660f6 JG |
1818 | .shutdown_session = scsiback_shutdown_session, |
1819 | .close_session = scsiback_close_session, | |
1820 | .sess_get_index = scsiback_sess_get_index, | |
1821 | .sess_get_initiator_sid = NULL, | |
1822 | .write_pending = scsiback_write_pending, | |
1823 | .write_pending_status = scsiback_write_pending_status, | |
1824 | .set_default_node_attributes = scsiback_set_default_node_attrs, | |
d9d660f6 JG |
1825 | .get_cmd_state = scsiback_get_cmd_state, |
1826 | .queue_data_in = scsiback_queue_data_in, | |
1827 | .queue_status = scsiback_queue_status, | |
1828 | .queue_tm_rsp = scsiback_queue_tm_rsp, | |
1829 | .aborted_task = scsiback_aborted_task, | |
1830 | /* | |
1831 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
1832 | */ | |
1833 | .fabric_make_wwn = scsiback_make_tport, | |
1834 | .fabric_drop_wwn = scsiback_drop_tport, | |
1835 | .fabric_make_tpg = scsiback_make_tpg, | |
1836 | .fabric_drop_tpg = scsiback_drop_tpg, | |
1837 | .fabric_post_link = scsiback_port_link, | |
1838 | .fabric_pre_unlink = scsiback_port_unlink, | |
d9d660f6 | 1839 | |
9ac8928e CH |
1840 | .tfc_wwn_attrs = scsiback_wwn_attrs, |
1841 | .tfc_tpg_base_attrs = scsiback_tpg_attrs, | |
1842 | .tfc_tpg_param_attrs = scsiback_param_attrs, | |
d9d660f6 JG |
1843 | }; |
1844 | ||
1845 | static const struct xenbus_device_id scsiback_ids[] = { | |
1846 | { "vscsi" }, | |
1847 | { "" } | |
1848 | }; | |
1849 | ||
95afae48 DV |
1850 | static struct xenbus_driver scsiback_driver = { |
1851 | .ids = scsiback_ids, | |
d9d660f6 JG |
1852 | .probe = scsiback_probe, |
1853 | .remove = scsiback_remove, | |
1854 | .otherend_changed = scsiback_frontend_changed | |
95afae48 | 1855 | }; |
d9d660f6 JG |
1856 | |
1857 | static void scsiback_init_pend(void *p) | |
1858 | { | |
1859 | struct vscsibk_pend *pend = p; | |
1860 | int i; | |
1861 | ||
1862 | memset(pend, 0, sizeof(*pend)); | |
1863 | for (i = 0; i < VSCSI_MAX_GRANTS; i++) | |
1864 | pend->grant_handles[i] = SCSIBACK_INVALID_HANDLE; | |
1865 | } | |
1866 | ||
1867 | static int __init scsiback_init(void) | |
1868 | { | |
1869 | int ret; | |
1870 | ||
1871 | if (!xen_domain()) | |
1872 | return -ENODEV; | |
1873 | ||
9ac8928e CH |
1874 | pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n", |
1875 | VSCSI_VERSION, utsname()->sysname, utsname()->machine); | |
1876 | ||
d9d660f6 JG |
1877 | scsiback_cachep = kmem_cache_create("vscsiif_cache", |
1878 | sizeof(struct vscsibk_pend), 0, 0, scsiback_init_pend); | |
1879 | if (!scsiback_cachep) | |
1880 | return -ENOMEM; | |
1881 | ||
1882 | ret = xenbus_register_backend(&scsiback_driver); | |
1883 | if (ret) | |
1884 | goto out_cache_destroy; | |
1885 | ||
9ac8928e | 1886 | ret = target_register_template(&scsiback_ops); |
d9d660f6 JG |
1887 | if (ret) |
1888 | goto out_unregister_xenbus; | |
1889 | ||
1890 | return 0; | |
1891 | ||
1892 | out_unregister_xenbus: | |
1893 | xenbus_unregister_driver(&scsiback_driver); | |
1894 | out_cache_destroy: | |
1895 | kmem_cache_destroy(scsiback_cachep); | |
78574878 | 1896 | pr_err("%s: error %d\n", __func__, ret); |
d9d660f6 JG |
1897 | return ret; |
1898 | } | |
1899 | ||
1900 | static void __exit scsiback_exit(void) | |
1901 | { | |
1902 | struct page *page; | |
1903 | ||
1904 | while (free_pages_num) { | |
1905 | if (get_free_page(&page)) | |
1906 | BUG(); | |
ff4b156f | 1907 | gnttab_free_pages(1, &page); |
d9d660f6 | 1908 | } |
9ac8928e | 1909 | target_unregister_template(&scsiback_ops); |
d9d660f6 JG |
1910 | xenbus_unregister_driver(&scsiback_driver); |
1911 | kmem_cache_destroy(scsiback_cachep); | |
1912 | } | |
1913 | ||
1914 | module_init(scsiback_init); | |
1915 | module_exit(scsiback_exit); | |
1916 | ||
1917 | MODULE_DESCRIPTION("Xen SCSI backend driver"); | |
1918 | MODULE_LICENSE("Dual BSD/GPL"); | |
1919 | MODULE_ALIAS("xen-backend:vscsi"); | |
1920 | MODULE_AUTHOR("Juergen Gross <jgross@suse.com>"); |