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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 <linux/module.h> |
37 | #include <linux/utsname.h> | |
38 | #include <linux/interrupt.h> | |
39 | #include <linux/slab.h> | |
40 | #include <linux/wait.h> | |
41 | #include <linux/sched.h> | |
42 | #include <linux/list.h> | |
43 | #include <linux/gfp.h> | |
44 | #include <linux/delay.h> | |
45 | #include <linux/spinlock.h> | |
46 | #include <linux/configfs.h> | |
47 | ||
48 | #include <generated/utsrelease.h> | |
49 | ||
ba929992 | 50 | #include <scsi/scsi_host.h> /* SG_ALL */ |
d9d660f6 JG |
51 | |
52 | #include <target/target_core_base.h> | |
53 | #include <target/target_core_fabric.h> | |
d9d660f6 JG |
54 | |
55 | #include <asm/hypervisor.h> | |
56 | ||
57 | #include <xen/xen.h> | |
58 | #include <xen/balloon.h> | |
59 | #include <xen/events.h> | |
60 | #include <xen/xenbus.h> | |
61 | #include <xen/grant_table.h> | |
62 | #include <xen/page.h> | |
63 | ||
64 | #include <xen/interface/grant_table.h> | |
65 | #include <xen/interface/io/vscsiif.h> | |
66 | ||
d9d660f6 JG |
67 | #define VSCSI_VERSION "v0.1" |
68 | #define VSCSI_NAMELEN 32 | |
69 | ||
70 | struct ids_tuple { | |
71 | unsigned int hst; /* host */ | |
72 | unsigned int chn; /* channel */ | |
73 | unsigned int tgt; /* target */ | |
74 | unsigned int lun; /* LUN */ | |
75 | }; | |
76 | ||
77 | struct v2p_entry { | |
78 | struct ids_tuple v; /* translate from */ | |
79 | struct scsiback_tpg *tpg; /* translate to */ | |
80 | unsigned int lun; | |
81 | struct kref kref; | |
82 | struct list_head l; | |
83 | }; | |
84 | ||
85 | struct vscsibk_info { | |
86 | struct xenbus_device *dev; | |
87 | ||
88 | domid_t domid; | |
89 | unsigned int irq; | |
90 | ||
91 | struct vscsiif_back_ring ring; | |
d9d660f6 JG |
92 | |
93 | spinlock_t ring_lock; | |
94 | atomic_t nr_unreplied_reqs; | |
95 | ||
96 | spinlock_t v2p_lock; | |
97 | struct list_head v2p_entry_lists; | |
98 | ||
99 | wait_queue_head_t waiting_to_free; | |
ca33479c JG |
100 | |
101 | struct gnttab_page_cache free_pages; | |
d9d660f6 JG |
102 | }; |
103 | ||
104 | /* theoretical maximum of grants for one request */ | |
105 | #define VSCSI_MAX_GRANTS (SG_ALL + VSCSIIF_SG_TABLESIZE) | |
106 | ||
107 | /* | |
108 | * VSCSI_GRANT_BATCH is the maximum number of grants to be processed in one | |
109 | * call to map/unmap grants. Don't choose it too large, as there are arrays | |
110 | * with VSCSI_GRANT_BATCH elements allocated on the stack. | |
111 | */ | |
112 | #define VSCSI_GRANT_BATCH 16 | |
113 | ||
114 | struct vscsibk_pend { | |
115 | uint16_t rqid; | |
116 | ||
117 | uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE]; | |
118 | uint8_t cmd_len; | |
119 | ||
120 | uint8_t sc_data_direction; | |
121 | uint16_t n_sg; /* real length of SG list */ | |
122 | uint16_t n_grants; /* SG pages and potentially SG list */ | |
123 | uint32_t data_len; | |
124 | uint32_t result; | |
125 | ||
126 | struct vscsibk_info *info; | |
127 | struct v2p_entry *v2p; | |
128 | struct scatterlist *sgl; | |
129 | ||
130 | uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE]; | |
131 | ||
132 | grant_handle_t grant_handles[VSCSI_MAX_GRANTS]; | |
133 | struct page *pages[VSCSI_MAX_GRANTS]; | |
134 | ||
135 | struct se_cmd se_cmd; | |
d9d660f6 | 136 | |
e3eac124 | 137 | struct completion tmr_done; |
d9d660f6 JG |
138 | }; |
139 | ||
2dbcdf33 NB |
140 | #define VSCSI_DEFAULT_SESSION_TAGS 128 |
141 | ||
d9d660f6 JG |
142 | struct scsiback_nexus { |
143 | /* Pointer to TCM session for I_T Nexus */ | |
144 | struct se_session *tvn_se_sess; | |
145 | }; | |
146 | ||
147 | struct scsiback_tport { | |
148 | /* SCSI protocol the tport is providing */ | |
149 | u8 tport_proto_id; | |
150 | /* Binary World Wide unique Port Name for pvscsi Target port */ | |
151 | u64 tport_wwpn; | |
152 | /* ASCII formatted WWPN for pvscsi Target port */ | |
153 | char tport_name[VSCSI_NAMELEN]; | |
154 | /* Returned by scsiback_make_tport() */ | |
155 | struct se_wwn tport_wwn; | |
156 | }; | |
157 | ||
158 | struct scsiback_tpg { | |
159 | /* scsiback port target portal group tag for TCM */ | |
160 | u16 tport_tpgt; | |
161 | /* track number of TPG Port/Lun Links wrt explicit I_T Nexus shutdown */ | |
162 | int tv_tpg_port_count; | |
163 | /* xen-pvscsi references to tpg_nexus, protected by tv_tpg_mutex */ | |
164 | int tv_tpg_fe_count; | |
165 | /* list for scsiback_list */ | |
166 | struct list_head tv_tpg_list; | |
167 | /* Used to protect access for tpg_nexus */ | |
168 | struct mutex tv_tpg_mutex; | |
169 | /* Pointer to the TCM pvscsi I_T Nexus for this TPG endpoint */ | |
170 | struct scsiback_nexus *tpg_nexus; | |
171 | /* Pointer back to scsiback_tport */ | |
172 | struct scsiback_tport *tport; | |
173 | /* Returned by scsiback_make_tpg() */ | |
174 | struct se_portal_group se_tpg; | |
175 | /* alias used in xenstore */ | |
176 | char param_alias[VSCSI_NAMELEN]; | |
177 | /* list of info structures related to this target portal group */ | |
178 | struct list_head info_list; | |
179 | }; | |
180 | ||
181 | #define SCSIBACK_INVALID_HANDLE (~0) | |
182 | ||
183 | static bool log_print_stat; | |
184 | module_param(log_print_stat, bool, 0644); | |
185 | ||
186 | static int scsiback_max_buffer_pages = 1024; | |
187 | module_param_named(max_buffer_pages, scsiback_max_buffer_pages, int, 0644); | |
188 | MODULE_PARM_DESC(max_buffer_pages, | |
189 | "Maximum number of free pages to keep in backend buffer"); | |
190 | ||
d9d660f6 JG |
191 | /* Global spinlock to protect scsiback TPG list */ |
192 | static DEFINE_MUTEX(scsiback_mutex); | |
193 | static LIST_HEAD(scsiback_list); | |
194 | ||
d9d660f6 JG |
195 | static void scsiback_get(struct vscsibk_info *info) |
196 | { | |
197 | atomic_inc(&info->nr_unreplied_reqs); | |
198 | } | |
199 | ||
200 | static void scsiback_put(struct vscsibk_info *info) | |
201 | { | |
202 | if (atomic_dec_and_test(&info->nr_unreplied_reqs)) | |
203 | wake_up(&info->waiting_to_free); | |
204 | } | |
205 | ||
d9d660f6 JG |
206 | static unsigned long vaddr_page(struct page *page) |
207 | { | |
208 | unsigned long pfn = page_to_pfn(page); | |
209 | ||
210 | return (unsigned long)pfn_to_kaddr(pfn); | |
211 | } | |
212 | ||
213 | static unsigned long vaddr(struct vscsibk_pend *req, int seg) | |
214 | { | |
215 | return vaddr_page(req->pages[seg]); | |
216 | } | |
217 | ||
218 | static void scsiback_print_status(char *sense_buffer, int errors, | |
219 | struct vscsibk_pend *pending_req) | |
220 | { | |
221 | struct scsiback_tpg *tpg = pending_req->v2p->tpg; | |
222 | ||
54c29086 | 223 | pr_err("[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x\n", |
d9d660f6 | 224 | tpg->tport->tport_name, pending_req->v2p->lun, |
3d45cefc | 225 | pending_req->cmnd[0], errors & 0xff, COMMAND_COMPLETE, |
54c29086 | 226 | host_byte(errors)); |
d9d660f6 JG |
227 | } |
228 | ||
229 | static void scsiback_fast_flush_area(struct vscsibk_pend *req) | |
230 | { | |
231 | struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH]; | |
232 | struct page *pages[VSCSI_GRANT_BATCH]; | |
233 | unsigned int i, invcount = 0; | |
234 | grant_handle_t handle; | |
235 | int err; | |
236 | ||
237 | kfree(req->sgl); | |
238 | req->sgl = NULL; | |
239 | req->n_sg = 0; | |
240 | ||
241 | if (!req->n_grants) | |
242 | return; | |
243 | ||
244 | for (i = 0; i < req->n_grants; i++) { | |
245 | handle = req->grant_handles[i]; | |
246 | if (handle == SCSIBACK_INVALID_HANDLE) | |
247 | continue; | |
248 | gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i), | |
249 | GNTMAP_host_map, handle); | |
250 | req->grant_handles[i] = SCSIBACK_INVALID_HANDLE; | |
251 | pages[invcount] = req->pages[i]; | |
252 | put_page(pages[invcount]); | |
253 | invcount++; | |
254 | if (invcount < VSCSI_GRANT_BATCH) | |
255 | continue; | |
256 | err = gnttab_unmap_refs(unmap, NULL, pages, invcount); | |
257 | BUG_ON(err); | |
258 | invcount = 0; | |
259 | } | |
260 | ||
261 | if (invcount) { | |
262 | err = gnttab_unmap_refs(unmap, NULL, pages, invcount); | |
263 | BUG_ON(err); | |
264 | } | |
265 | ||
ca33479c JG |
266 | gnttab_page_cache_put(&req->info->free_pages, req->pages, |
267 | req->n_grants); | |
d9d660f6 JG |
268 | req->n_grants = 0; |
269 | } | |
270 | ||
271 | static void scsiback_free_translation_entry(struct kref *kref) | |
272 | { | |
273 | struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref); | |
274 | struct scsiback_tpg *tpg = entry->tpg; | |
275 | ||
276 | mutex_lock(&tpg->tv_tpg_mutex); | |
277 | tpg->tv_tpg_fe_count--; | |
278 | mutex_unlock(&tpg->tv_tpg_mutex); | |
279 | ||
280 | kfree(entry); | |
281 | } | |
282 | ||
2dbcdf33 NB |
283 | static void scsiback_send_response(struct vscsibk_info *info, |
284 | char *sense_buffer, int32_t result, uint32_t resid, | |
285 | uint16_t rqid) | |
d9d660f6 JG |
286 | { |
287 | struct vscsiif_response *ring_res; | |
d9d660f6 JG |
288 | int notify; |
289 | struct scsi_sense_hdr sshdr; | |
290 | unsigned long flags; | |
291 | unsigned len; | |
292 | ||
293 | spin_lock_irqsave(&info->ring_lock, flags); | |
294 | ||
295 | ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt); | |
296 | info->ring.rsp_prod_pvt++; | |
297 | ||
298 | ring_res->rslt = result; | |
2dbcdf33 | 299 | ring_res->rqid = rqid; |
d9d660f6 JG |
300 | |
301 | if (sense_buffer != NULL && | |
302 | scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE, | |
303 | &sshdr)) { | |
304 | len = min_t(unsigned, 8 + sense_buffer[7], | |
305 | VSCSIIF_SENSE_BUFFERSIZE); | |
306 | memcpy(ring_res->sense_buffer, sense_buffer, len); | |
307 | ring_res->sense_len = len; | |
308 | } else { | |
309 | ring_res->sense_len = 0; | |
310 | } | |
311 | ||
312 | ring_res->residual_len = resid; | |
313 | ||
314 | RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify); | |
315 | spin_unlock_irqrestore(&info->ring_lock, flags); | |
316 | ||
317 | if (notify) | |
318 | notify_remote_via_irq(info->irq); | |
2dbcdf33 NB |
319 | } |
320 | ||
321 | static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result, | |
322 | uint32_t resid, struct vscsibk_pend *pending_req) | |
323 | { | |
324 | scsiback_send_response(pending_req->info, sense_buffer, result, | |
325 | resid, pending_req->rqid); | |
d9d660f6 JG |
326 | |
327 | if (pending_req->v2p) | |
328 | kref_put(&pending_req->v2p->kref, | |
329 | scsiback_free_translation_entry); | |
330 | } | |
331 | ||
332 | static void scsiback_cmd_done(struct vscsibk_pend *pending_req) | |
333 | { | |
334 | struct vscsibk_info *info = pending_req->info; | |
335 | unsigned char *sense_buffer; | |
336 | unsigned int resid; | |
337 | int errors; | |
338 | ||
339 | sense_buffer = pending_req->sense_buffer; | |
340 | resid = pending_req->se_cmd.residual_count; | |
341 | errors = pending_req->result; | |
342 | ||
343 | if (errors && log_print_stat) | |
344 | scsiback_print_status(sense_buffer, errors, pending_req); | |
345 | ||
346 | scsiback_fast_flush_area(pending_req); | |
347 | scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req); | |
348 | scsiback_put(info); | |
fa22e7b7 NB |
349 | /* |
350 | * Drop the extra KREF_ACK reference taken by target_submit_cmd_map_sgls() | |
351 | * ahead of scsiback_check_stop_free() -> transport_generic_free_cmd() | |
352 | * final se_cmd->cmd_kref put. | |
353 | */ | |
354 | target_put_sess_cmd(&pending_req->se_cmd); | |
d9d660f6 JG |
355 | } |
356 | ||
357 | static void scsiback_cmd_exec(struct vscsibk_pend *pending_req) | |
358 | { | |
359 | struct se_cmd *se_cmd = &pending_req->se_cmd; | |
360 | struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess; | |
d9d660f6 | 361 | |
d9d660f6 | 362 | scsiback_get(pending_req->info); |
649ee054 | 363 | se_cmd->tag = pending_req->rqid; |
1f48b065 MC |
364 | target_init_cmd(se_cmd, sess, pending_req->sense_buffer, |
365 | pending_req->v2p->lun, pending_req->data_len, 0, | |
366 | pending_req->sc_data_direction, TARGET_SCF_ACK_KREF); | |
367 | ||
368 | if (target_submit_prep(se_cmd, pending_req->cmnd, pending_req->sgl, | |
08694199 | 369 | pending_req->n_sg, NULL, 0, NULL, 0, GFP_KERNEL)) |
1f48b065 MC |
370 | return; |
371 | ||
372 | target_submit(se_cmd); | |
d9d660f6 JG |
373 | } |
374 | ||
375 | static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map, | |
376 | struct page **pg, grant_handle_t *grant, int cnt) | |
377 | { | |
378 | int err, i; | |
379 | ||
380 | if (!cnt) | |
381 | return 0; | |
382 | ||
383 | err = gnttab_map_refs(map, NULL, pg, cnt); | |
d9d660f6 JG |
384 | for (i = 0; i < cnt; i++) { |
385 | if (unlikely(map[i].status != GNTST_okay)) { | |
78574878 | 386 | pr_err("invalid buffer -- could not remap it\n"); |
d9d660f6 | 387 | map[i].handle = SCSIBACK_INVALID_HANDLE; |
7c77474b JB |
388 | if (!err) |
389 | err = -ENOMEM; | |
d9d660f6 JG |
390 | } else { |
391 | get_page(pg[i]); | |
392 | } | |
393 | grant[i] = map[i].handle; | |
394 | } | |
395 | return err; | |
396 | } | |
397 | ||
398 | static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req, | |
399 | struct scsiif_request_segment *seg, struct page **pg, | |
400 | grant_handle_t *grant, int cnt, u32 flags) | |
401 | { | |
402 | int mapcount = 0, i, err = 0; | |
403 | struct gnttab_map_grant_ref map[VSCSI_GRANT_BATCH]; | |
404 | struct vscsibk_info *info = pending_req->info; | |
405 | ||
406 | for (i = 0; i < cnt; i++) { | |
ca33479c JG |
407 | if (gnttab_page_cache_get(&info->free_pages, pg + mapcount)) { |
408 | gnttab_page_cache_put(&info->free_pages, pg, mapcount); | |
78574878 | 409 | pr_err("no grant page\n"); |
d9d660f6 JG |
410 | return -ENOMEM; |
411 | } | |
412 | gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]), | |
413 | flags, seg[i].gref, info->domid); | |
414 | mapcount++; | |
415 | if (mapcount < VSCSI_GRANT_BATCH) | |
416 | continue; | |
417 | err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); | |
418 | pg += mapcount; | |
419 | grant += mapcount; | |
420 | pending_req->n_grants += mapcount; | |
421 | if (err) | |
422 | return err; | |
423 | mapcount = 0; | |
424 | } | |
425 | err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); | |
426 | pending_req->n_grants += mapcount; | |
427 | return err; | |
428 | } | |
429 | ||
430 | static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req, | |
431 | struct vscsibk_pend *pending_req) | |
432 | { | |
433 | u32 flags; | |
434 | int i, err, n_segs, i_seg = 0; | |
435 | struct page **pg; | |
436 | struct scsiif_request_segment *seg; | |
437 | unsigned long end_seg = 0; | |
438 | unsigned int nr_segments = (unsigned int)ring_req->nr_segments; | |
439 | unsigned int nr_sgl = 0; | |
440 | struct scatterlist *sg; | |
441 | grant_handle_t *grant; | |
442 | ||
443 | pending_req->n_sg = 0; | |
444 | pending_req->n_grants = 0; | |
445 | pending_req->data_len = 0; | |
446 | ||
447 | nr_segments &= ~VSCSIIF_SG_GRANT; | |
448 | if (!nr_segments) | |
449 | return 0; | |
450 | ||
451 | if (nr_segments > VSCSIIF_SG_TABLESIZE) { | |
78574878 | 452 | pr_debug("invalid parameter nr_seg = %d\n", |
d9d660f6 JG |
453 | ring_req->nr_segments); |
454 | return -EINVAL; | |
455 | } | |
456 | ||
457 | if (ring_req->nr_segments & VSCSIIF_SG_GRANT) { | |
458 | err = scsiback_gnttab_data_map_list(pending_req, ring_req->seg, | |
459 | pending_req->pages, pending_req->grant_handles, | |
460 | nr_segments, GNTMAP_host_map | GNTMAP_readonly); | |
461 | if (err) | |
462 | return err; | |
463 | nr_sgl = nr_segments; | |
464 | nr_segments = 0; | |
465 | for (i = 0; i < nr_sgl; i++) { | |
466 | n_segs = ring_req->seg[i].length / | |
467 | sizeof(struct scsiif_request_segment); | |
468 | if ((unsigned)ring_req->seg[i].offset + | |
469 | (unsigned)ring_req->seg[i].length > PAGE_SIZE || | |
470 | n_segs * sizeof(struct scsiif_request_segment) != | |
471 | ring_req->seg[i].length) | |
472 | return -EINVAL; | |
473 | nr_segments += n_segs; | |
474 | } | |
475 | if (nr_segments > SG_ALL) { | |
78574878 | 476 | pr_debug("invalid nr_seg = %d\n", nr_segments); |
d9d660f6 JG |
477 | return -EINVAL; |
478 | } | |
479 | } | |
480 | ||
78574878 | 481 | /* free of (sgl) in fast_flush_area() */ |
d9d660f6 JG |
482 | pending_req->sgl = kmalloc_array(nr_segments, |
483 | sizeof(struct scatterlist), GFP_KERNEL); | |
484 | if (!pending_req->sgl) | |
485 | return -ENOMEM; | |
486 | ||
487 | sg_init_table(pending_req->sgl, nr_segments); | |
488 | pending_req->n_sg = nr_segments; | |
489 | ||
490 | flags = GNTMAP_host_map; | |
491 | if (pending_req->sc_data_direction == DMA_TO_DEVICE) | |
492 | flags |= GNTMAP_readonly; | |
493 | ||
494 | pg = pending_req->pages + nr_sgl; | |
495 | grant = pending_req->grant_handles + nr_sgl; | |
496 | if (!nr_sgl) { | |
497 | seg = ring_req->seg; | |
498 | err = scsiback_gnttab_data_map_list(pending_req, seg, | |
499 | pg, grant, nr_segments, flags); | |
500 | if (err) | |
501 | return err; | |
502 | } else { | |
503 | for (i = 0; i < nr_sgl; i++) { | |
504 | seg = (struct scsiif_request_segment *)( | |
505 | vaddr(pending_req, i) + ring_req->seg[i].offset); | |
506 | n_segs = ring_req->seg[i].length / | |
507 | sizeof(struct scsiif_request_segment); | |
508 | err = scsiback_gnttab_data_map_list(pending_req, seg, | |
509 | pg, grant, n_segs, flags); | |
510 | if (err) | |
511 | return err; | |
512 | pg += n_segs; | |
513 | grant += n_segs; | |
514 | } | |
515 | end_seg = vaddr(pending_req, 0) + ring_req->seg[0].offset; | |
516 | seg = (struct scsiif_request_segment *)end_seg; | |
517 | end_seg += ring_req->seg[0].length; | |
518 | pg = pending_req->pages + nr_sgl; | |
519 | } | |
520 | ||
521 | for_each_sg(pending_req->sgl, sg, nr_segments, i) { | |
522 | sg_set_page(sg, pg[i], seg->length, seg->offset); | |
523 | pending_req->data_len += seg->length; | |
524 | seg++; | |
525 | if (nr_sgl && (unsigned long)seg >= end_seg) { | |
526 | i_seg++; | |
527 | end_seg = vaddr(pending_req, i_seg) + | |
528 | ring_req->seg[i_seg].offset; | |
529 | seg = (struct scsiif_request_segment *)end_seg; | |
530 | end_seg += ring_req->seg[i_seg].length; | |
531 | } | |
532 | if (sg->offset >= PAGE_SIZE || | |
533 | sg->length > PAGE_SIZE || | |
534 | sg->offset + sg->length > PAGE_SIZE) | |
535 | return -EINVAL; | |
536 | } | |
537 | ||
538 | return 0; | |
539 | } | |
540 | ||
541 | static void scsiback_disconnect(struct vscsibk_info *info) | |
542 | { | |
543 | wait_event(info->waiting_to_free, | |
544 | atomic_read(&info->nr_unreplied_reqs) == 0); | |
545 | ||
546 | unbind_from_irqhandler(info->irq, info); | |
547 | info->irq = 0; | |
548 | xenbus_unmap_ring_vfree(info->dev, info->ring.sring); | |
549 | } | |
550 | ||
551 | static void scsiback_device_action(struct vscsibk_pend *pending_req, | |
552 | enum tcm_tmreq_table act, int tag) | |
553 | { | |
d9d660f6 | 554 | struct scsiback_tpg *tpg = pending_req->v2p->tpg; |
fa22e7b7 | 555 | struct scsiback_nexus *nexus = tpg->tpg_nexus; |
d9d660f6 | 556 | struct se_cmd *se_cmd = &pending_req->se_cmd; |
fa22e7b7 NB |
557 | u64 unpacked_lun = pending_req->v2p->lun; |
558 | int rc, err = FAILED; | |
d9d660f6 | 559 | |
e3eac124 | 560 | init_completion(&pending_req->tmr_done); |
d9d660f6 | 561 | |
fa22e7b7 NB |
562 | rc = target_submit_tmr(&pending_req->se_cmd, nexus->tvn_se_sess, |
563 | &pending_req->sense_buffer[0], | |
9f4ab18a | 564 | unpacked_lun, NULL, act, GFP_KERNEL, |
fa22e7b7 NB |
565 | tag, TARGET_SCF_ACK_KREF); |
566 | if (rc) | |
567 | goto err; | |
d9d660f6 | 568 | |
e3eac124 | 569 | wait_for_completion(&pending_req->tmr_done); |
d9d660f6 JG |
570 | |
571 | err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? | |
572 | SUCCESS : FAILED; | |
573 | ||
2dbcdf33 | 574 | scsiback_do_resp_with_sense(NULL, err, 0, pending_req); |
af90e84d | 575 | transport_generic_free_cmd(&pending_req->se_cmd, 0); |
2dbcdf33 | 576 | return; |
9f4ab18a | 577 | |
fa22e7b7 | 578 | err: |
d9d660f6 | 579 | scsiback_do_resp_with_sense(NULL, err, 0, pending_req); |
d9d660f6 JG |
580 | } |
581 | ||
582 | /* | |
583 | Perform virtual to physical translation | |
584 | */ | |
585 | static struct v2p_entry *scsiback_do_translation(struct vscsibk_info *info, | |
586 | struct ids_tuple *v) | |
587 | { | |
588 | struct v2p_entry *entry; | |
589 | struct list_head *head = &(info->v2p_entry_lists); | |
590 | unsigned long flags; | |
591 | ||
592 | spin_lock_irqsave(&info->v2p_lock, flags); | |
593 | list_for_each_entry(entry, head, l) { | |
594 | if ((entry->v.chn == v->chn) && | |
595 | (entry->v.tgt == v->tgt) && | |
596 | (entry->v.lun == v->lun)) { | |
597 | kref_get(&entry->kref); | |
598 | goto out; | |
599 | } | |
600 | } | |
601 | entry = NULL; | |
602 | ||
603 | out: | |
604 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
605 | return entry; | |
606 | } | |
607 | ||
2dbcdf33 NB |
608 | static struct vscsibk_pend *scsiback_get_pend_req(struct vscsiif_back_ring *ring, |
609 | struct v2p_entry *v2p) | |
610 | { | |
611 | struct scsiback_tpg *tpg = v2p->tpg; | |
612 | struct scsiback_nexus *nexus = tpg->tpg_nexus; | |
613 | struct se_session *se_sess = nexus->tvn_se_sess; | |
614 | struct vscsibk_pend *req; | |
10e9cbb6 | 615 | int tag, cpu, i; |
2dbcdf33 | 616 | |
10e9cbb6 | 617 | tag = sbitmap_queue_get(&se_sess->sess_tag_pool, &cpu); |
2dbcdf33 NB |
618 | if (tag < 0) { |
619 | pr_err("Unable to obtain tag for vscsiif_request\n"); | |
620 | return ERR_PTR(-ENOMEM); | |
621 | } | |
622 | ||
623 | req = &((struct vscsibk_pend *)se_sess->sess_cmd_map)[tag]; | |
624 | memset(req, 0, sizeof(*req)); | |
625 | req->se_cmd.map_tag = tag; | |
10e9cbb6 | 626 | req->se_cmd.map_cpu = cpu; |
2dbcdf33 NB |
627 | |
628 | for (i = 0; i < VSCSI_MAX_GRANTS; i++) | |
629 | req->grant_handles[i] = SCSIBACK_INVALID_HANDLE; | |
630 | ||
631 | return req; | |
632 | } | |
633 | ||
634 | static struct vscsibk_pend *prepare_pending_reqs(struct vscsibk_info *info, | |
635 | struct vscsiif_back_ring *ring, | |
636 | struct vscsiif_request *ring_req) | |
d9d660f6 | 637 | { |
2dbcdf33 | 638 | struct vscsibk_pend *pending_req; |
d9d660f6 JG |
639 | struct v2p_entry *v2p; |
640 | struct ids_tuple vir; | |
641 | ||
2dbcdf33 NB |
642 | /* request range check from frontend */ |
643 | if ((ring_req->sc_data_direction != DMA_BIDIRECTIONAL) && | |
644 | (ring_req->sc_data_direction != DMA_TO_DEVICE) && | |
645 | (ring_req->sc_data_direction != DMA_FROM_DEVICE) && | |
646 | (ring_req->sc_data_direction != DMA_NONE)) { | |
647 | pr_debug("invalid parameter data_dir = %d\n", | |
648 | ring_req->sc_data_direction); | |
649 | return ERR_PTR(-EINVAL); | |
650 | } | |
651 | if (ring_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) { | |
652 | pr_debug("invalid parameter cmd_len = %d\n", | |
653 | ring_req->cmd_len); | |
654 | return ERR_PTR(-EINVAL); | |
655 | } | |
d9d660f6 JG |
656 | |
657 | vir.chn = ring_req->channel; | |
658 | vir.tgt = ring_req->id; | |
659 | vir.lun = ring_req->lun; | |
660 | ||
661 | v2p = scsiback_do_translation(info, &vir); | |
662 | if (!v2p) { | |
78574878 | 663 | pr_debug("the v2p of (chn:%d, tgt:%d, lun:%d) doesn't exist.\n", |
2dbcdf33 NB |
664 | vir.chn, vir.tgt, vir.lun); |
665 | return ERR_PTR(-ENODEV); | |
d9d660f6 | 666 | } |
d9d660f6 | 667 | |
2dbcdf33 NB |
668 | pending_req = scsiback_get_pend_req(ring, v2p); |
669 | if (IS_ERR(pending_req)) { | |
670 | kref_put(&v2p->kref, scsiback_free_translation_entry); | |
671 | return ERR_PTR(-ENOMEM); | |
d9d660f6 | 672 | } |
2dbcdf33 NB |
673 | pending_req->rqid = ring_req->rqid; |
674 | pending_req->info = info; | |
675 | pending_req->v2p = v2p; | |
676 | pending_req->sc_data_direction = ring_req->sc_data_direction; | |
d9d660f6 | 677 | pending_req->cmd_len = ring_req->cmd_len; |
d9d660f6 JG |
678 | memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len); |
679 | ||
2dbcdf33 | 680 | return pending_req; |
d9d660f6 JG |
681 | } |
682 | ||
86991b6e JG |
683 | static int scsiback_do_cmd_fn(struct vscsibk_info *info, |
684 | unsigned int *eoi_flags) | |
d9d660f6 JG |
685 | { |
686 | struct vscsiif_back_ring *ring = &info->ring; | |
facb5732 | 687 | struct vscsiif_request ring_req; |
d9d660f6 JG |
688 | struct vscsibk_pend *pending_req; |
689 | RING_IDX rc, rp; | |
2dbcdf33 | 690 | int more_to_do; |
d9d660f6 | 691 | uint32_t result; |
d9d660f6 JG |
692 | |
693 | rc = ring->req_cons; | |
694 | rp = ring->sring->req_prod; | |
695 | rmb(); /* guest system is accessing ring, too */ | |
696 | ||
697 | if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) { | |
698 | rc = ring->rsp_prod_pvt; | |
78574878 | 699 | pr_warn("Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n", |
d9d660f6 | 700 | info->domid, rp, rc, rp - rc); |
86991b6e | 701 | return -EINVAL; |
d9d660f6 JG |
702 | } |
703 | ||
704 | while ((rc != rp)) { | |
86991b6e JG |
705 | *eoi_flags &= ~XEN_EOI_FLAG_SPURIOUS; |
706 | ||
d9d660f6 JG |
707 | if (RING_REQUEST_CONS_OVERFLOW(ring, rc)) |
708 | break; | |
d9d660f6 | 709 | |
be69746e | 710 | RING_COPY_REQUEST(ring, rc, &ring_req); |
d9d660f6 JG |
711 | ring->req_cons = ++rc; |
712 | ||
2dbcdf33 NB |
713 | pending_req = prepare_pending_reqs(info, ring, &ring_req); |
714 | if (IS_ERR(pending_req)) { | |
715 | switch (PTR_ERR(pending_req)) { | |
d9d660f6 JG |
716 | case -ENODEV: |
717 | result = DID_NO_CONNECT; | |
718 | break; | |
719 | default: | |
58bedf35 | 720 | result = DID_ERROR; |
d9d660f6 JG |
721 | break; |
722 | } | |
58bedf35 | 723 | scsiback_send_response(info, NULL, result << 16, 0, |
2dbcdf33 | 724 | ring_req.rqid); |
d9d660f6 JG |
725 | return 1; |
726 | } | |
727 | ||
facb5732 | 728 | switch (ring_req.act) { |
d9d660f6 | 729 | case VSCSIIF_ACT_SCSI_CDB: |
facb5732 | 730 | if (scsiback_gnttab_data_map(&ring_req, pending_req)) { |
d9d660f6 JG |
731 | scsiback_fast_flush_area(pending_req); |
732 | scsiback_do_resp_with_sense(NULL, | |
58bedf35 | 733 | DID_ERROR << 16, 0, pending_req); |
2dbcdf33 | 734 | transport_generic_free_cmd(&pending_req->se_cmd, 0); |
d9d660f6 JG |
735 | } else { |
736 | scsiback_cmd_exec(pending_req); | |
737 | } | |
738 | break; | |
739 | case VSCSIIF_ACT_SCSI_ABORT: | |
740 | scsiback_device_action(pending_req, TMR_ABORT_TASK, | |
facb5732 | 741 | ring_req.ref_rqid); |
d9d660f6 JG |
742 | break; |
743 | case VSCSIIF_ACT_SCSI_RESET: | |
744 | scsiback_device_action(pending_req, TMR_LUN_RESET, 0); | |
745 | break; | |
746 | default: | |
78574878 | 747 | pr_err_ratelimited("invalid request\n"); |
58bedf35 | 748 | scsiback_do_resp_with_sense(NULL, DID_ERROR << 16, 0, |
2dbcdf33 NB |
749 | pending_req); |
750 | transport_generic_free_cmd(&pending_req->se_cmd, 0); | |
d9d660f6 JG |
751 | break; |
752 | } | |
753 | ||
754 | /* Yield point for this unbounded loop. */ | |
755 | cond_resched(); | |
756 | } | |
757 | ||
ca33479c JG |
758 | gnttab_page_cache_shrink(&info->free_pages, scsiback_max_buffer_pages); |
759 | ||
d9d660f6 JG |
760 | RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do); |
761 | return more_to_do; | |
762 | } | |
763 | ||
764 | static irqreturn_t scsiback_irq_fn(int irq, void *dev_id) | |
765 | { | |
766 | struct vscsibk_info *info = dev_id; | |
86991b6e JG |
767 | int rc; |
768 | unsigned int eoi_flags = XEN_EOI_FLAG_SPURIOUS; | |
d9d660f6 | 769 | |
86991b6e | 770 | while ((rc = scsiback_do_cmd_fn(info, &eoi_flags)) > 0) |
d9d660f6 JG |
771 | cond_resched(); |
772 | ||
86991b6e JG |
773 | /* In case of a ring error we keep the event channel masked. */ |
774 | if (!rc) | |
775 | xen_irq_lateeoi(irq, eoi_flags); | |
776 | ||
d9d660f6 JG |
777 | return IRQ_HANDLED; |
778 | } | |
779 | ||
780 | static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref, | |
781 | evtchn_port_t evtchn) | |
782 | { | |
783 | void *area; | |
784 | struct vscsiif_sring *sring; | |
785 | int err; | |
786 | ||
787 | if (info->irq) | |
788 | return -1; | |
789 | ||
ccc9d90a | 790 | err = xenbus_map_ring_valloc(info->dev, &ring_ref, 1, &area); |
d9d660f6 JG |
791 | if (err) |
792 | return err; | |
793 | ||
794 | sring = (struct vscsiif_sring *)area; | |
795 | BACK_RING_INIT(&info->ring, sring, PAGE_SIZE); | |
796 | ||
f2fa0e5e | 797 | err = bind_interdomain_evtchn_to_irq_lateeoi(info->dev, evtchn); |
d9d660f6 JG |
798 | if (err < 0) |
799 | goto unmap_page; | |
800 | ||
801 | info->irq = err; | |
802 | ||
803 | err = request_threaded_irq(info->irq, NULL, scsiback_irq_fn, | |
804 | IRQF_ONESHOT, "vscsiif-backend", info); | |
805 | if (err) | |
806 | goto free_irq; | |
807 | ||
808 | return 0; | |
809 | ||
810 | free_irq: | |
811 | unbind_from_irqhandler(info->irq, info); | |
812 | info->irq = 0; | |
813 | unmap_page: | |
814 | xenbus_unmap_ring_vfree(info->dev, area); | |
815 | ||
816 | return err; | |
817 | } | |
818 | ||
819 | static int scsiback_map(struct vscsibk_info *info) | |
820 | { | |
821 | struct xenbus_device *dev = info->dev; | |
0102e4ef YY |
822 | unsigned int ring_ref; |
823 | evtchn_port_t evtchn; | |
d9d660f6 JG |
824 | int err; |
825 | ||
826 | err = xenbus_gather(XBT_NIL, dev->otherend, | |
827 | "ring-ref", "%u", &ring_ref, | |
828 | "event-channel", "%u", &evtchn, NULL); | |
829 | if (err) { | |
830 | xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend); | |
831 | return err; | |
832 | } | |
833 | ||
834 | return scsiback_init_sring(info, ring_ref, evtchn); | |
835 | } | |
836 | ||
c9e2f531 JG |
837 | /* |
838 | Check for a translation entry being present | |
839 | */ | |
840 | static struct v2p_entry *scsiback_chk_translation_entry( | |
841 | struct vscsibk_info *info, struct ids_tuple *v) | |
842 | { | |
843 | struct list_head *head = &(info->v2p_entry_lists); | |
844 | struct v2p_entry *entry; | |
845 | ||
846 | list_for_each_entry(entry, head, l) | |
847 | if ((entry->v.chn == v->chn) && | |
848 | (entry->v.tgt == v->tgt) && | |
849 | (entry->v.lun == v->lun)) | |
850 | return entry; | |
851 | ||
852 | return NULL; | |
853 | } | |
854 | ||
d9d660f6 JG |
855 | /* |
856 | Add a new translation entry | |
857 | */ | |
858 | static int scsiback_add_translation_entry(struct vscsibk_info *info, | |
859 | char *phy, struct ids_tuple *v) | |
860 | { | |
861 | int err = 0; | |
d9d660f6 | 862 | struct v2p_entry *new; |
d9d660f6 JG |
863 | unsigned long flags; |
864 | char *lunp; | |
196e2e2a | 865 | unsigned long long unpacked_lun; |
6bb82612 | 866 | struct se_lun *se_lun; |
d9d660f6 JG |
867 | struct scsiback_tpg *tpg_entry, *tpg = NULL; |
868 | char *error = "doesn't exist"; | |
869 | ||
870 | lunp = strrchr(phy, ':'); | |
871 | if (!lunp) { | |
78574878 | 872 | pr_err("illegal format of physical device %s\n", phy); |
d9d660f6 JG |
873 | return -EINVAL; |
874 | } | |
875 | *lunp = 0; | |
876 | lunp++; | |
196e2e2a HR |
877 | err = kstrtoull(lunp, 10, &unpacked_lun); |
878 | if (err < 0) { | |
78574878 | 879 | pr_err("lun number not valid: %s\n", lunp); |
196e2e2a | 880 | return err; |
d9d660f6 JG |
881 | } |
882 | ||
883 | mutex_lock(&scsiback_mutex); | |
884 | list_for_each_entry(tpg_entry, &scsiback_list, tv_tpg_list) { | |
885 | if (!strcmp(phy, tpg_entry->tport->tport_name) || | |
886 | !strcmp(phy, tpg_entry->param_alias)) { | |
6bb82612 NB |
887 | mutex_lock(&tpg_entry->se_tpg.tpg_lun_mutex); |
888 | hlist_for_each_entry(se_lun, &tpg_entry->se_tpg.tpg_lun_hlist, link) { | |
889 | if (se_lun->unpacked_lun == unpacked_lun) { | |
890 | if (!tpg_entry->tpg_nexus) | |
891 | error = "nexus undefined"; | |
892 | else | |
893 | tpg = tpg_entry; | |
894 | break; | |
895 | } | |
d9d660f6 | 896 | } |
6bb82612 | 897 | mutex_unlock(&tpg_entry->se_tpg.tpg_lun_mutex); |
d9d660f6 JG |
898 | break; |
899 | } | |
900 | } | |
901 | if (tpg) { | |
902 | mutex_lock(&tpg->tv_tpg_mutex); | |
903 | tpg->tv_tpg_fe_count++; | |
904 | mutex_unlock(&tpg->tv_tpg_mutex); | |
905 | } | |
906 | mutex_unlock(&scsiback_mutex); | |
907 | ||
908 | if (!tpg) { | |
0fb1f14e | 909 | pr_err("%s:%llu %s\n", phy, unpacked_lun, error); |
d9d660f6 JG |
910 | return -ENODEV; |
911 | } | |
912 | ||
913 | new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL); | |
914 | if (new == NULL) { | |
915 | err = -ENOMEM; | |
916 | goto out_free; | |
917 | } | |
918 | ||
919 | spin_lock_irqsave(&info->v2p_lock, flags); | |
920 | ||
921 | /* Check double assignment to identical virtual ID */ | |
c9e2f531 JG |
922 | if (scsiback_chk_translation_entry(info, v)) { |
923 | pr_warn("Virtual ID is already used. Assignment was not performed.\n"); | |
924 | err = -EEXIST; | |
925 | goto out; | |
d9d660f6 JG |
926 | } |
927 | ||
928 | /* Create a new translation entry and add to the list */ | |
929 | kref_init(&new->kref); | |
930 | new->v = *v; | |
931 | new->tpg = tpg; | |
6bb82612 | 932 | new->lun = unpacked_lun; |
c9e2f531 | 933 | list_add_tail(&new->l, &info->v2p_entry_lists); |
d9d660f6 JG |
934 | |
935 | out: | |
936 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
937 | ||
938 | out_free: | |
f285aa8d JG |
939 | if (err) { |
940 | mutex_lock(&tpg->tv_tpg_mutex); | |
941 | tpg->tv_tpg_fe_count--; | |
942 | mutex_unlock(&tpg->tv_tpg_mutex); | |
d9d660f6 | 943 | kfree(new); |
f285aa8d | 944 | } |
d9d660f6 JG |
945 | |
946 | return err; | |
947 | } | |
948 | ||
949 | static void __scsiback_del_translation_entry(struct v2p_entry *entry) | |
950 | { | |
951 | list_del(&entry->l); | |
952 | kref_put(&entry->kref, scsiback_free_translation_entry); | |
953 | } | |
954 | ||
955 | /* | |
c9e2f531 | 956 | Delete the translation entry specified |
d9d660f6 JG |
957 | */ |
958 | static int scsiback_del_translation_entry(struct vscsibk_info *info, | |
959 | struct ids_tuple *v) | |
960 | { | |
961 | struct v2p_entry *entry; | |
d9d660f6 | 962 | unsigned long flags; |
c9e2f531 | 963 | int ret = 0; |
d9d660f6 JG |
964 | |
965 | spin_lock_irqsave(&info->v2p_lock, flags); | |
966 | /* Find out the translation entry specified */ | |
c9e2f531 JG |
967 | entry = scsiback_chk_translation_entry(info, v); |
968 | if (entry) | |
969 | __scsiback_del_translation_entry(entry); | |
970 | else | |
971 | ret = -ENOENT; | |
d9d660f6 JG |
972 | |
973 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
c9e2f531 | 974 | return ret; |
d9d660f6 JG |
975 | } |
976 | ||
977 | static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state, | |
169e6cf0 | 978 | char *phy, struct ids_tuple *vir, int try) |
d9d660f6 | 979 | { |
c9e2f531 JG |
980 | struct v2p_entry *entry; |
981 | unsigned long flags; | |
7c63ca24 | 982 | int err; |
c9e2f531 JG |
983 | |
984 | if (try) { | |
985 | spin_lock_irqsave(&info->v2p_lock, flags); | |
986 | entry = scsiback_chk_translation_entry(info, vir); | |
987 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
988 | if (entry) | |
989 | return; | |
990 | } | |
d9d660f6 JG |
991 | if (!scsiback_add_translation_entry(info, phy, vir)) { |
992 | if (xenbus_printf(XBT_NIL, info->dev->nodename, state, | |
993 | "%d", XenbusStateInitialised)) { | |
78574878 | 994 | pr_err("xenbus_printf error %s\n", state); |
d9d660f6 JG |
995 | scsiback_del_translation_entry(info, vir); |
996 | } | |
169e6cf0 | 997 | } else if (!try) { |
7c63ca24 | 998 | err = xenbus_printf(XBT_NIL, info->dev->nodename, state, |
d9d660f6 | 999 | "%d", XenbusStateClosed); |
7c63ca24 ZJ |
1000 | if (err) |
1001 | xenbus_dev_error(info->dev, err, | |
1002 | "%s: writing %s", __func__, state); | |
d9d660f6 JG |
1003 | } |
1004 | } | |
1005 | ||
1006 | static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state, | |
1007 | struct ids_tuple *vir) | |
1008 | { | |
1009 | if (!scsiback_del_translation_entry(info, vir)) { | |
1010 | if (xenbus_printf(XBT_NIL, info->dev->nodename, state, | |
1011 | "%d", XenbusStateClosed)) | |
78574878 | 1012 | pr_err("xenbus_printf error %s\n", state); |
d9d660f6 JG |
1013 | } |
1014 | } | |
1015 | ||
1016 | #define VSCSIBACK_OP_ADD_OR_DEL_LUN 1 | |
1017 | #define VSCSIBACK_OP_UPDATEDEV_STATE 2 | |
1018 | ||
1019 | static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op, | |
1020 | char *ent) | |
1021 | { | |
1022 | int err; | |
1023 | struct ids_tuple vir; | |
1024 | char *val; | |
1025 | int device_state; | |
1026 | char phy[VSCSI_NAMELEN]; | |
1027 | char str[64]; | |
1028 | char state[64]; | |
1029 | struct xenbus_device *dev = info->dev; | |
1030 | ||
1031 | /* read status */ | |
1032 | snprintf(state, sizeof(state), "vscsi-devs/%s/state", ent); | |
1033 | err = xenbus_scanf(XBT_NIL, dev->nodename, state, "%u", &device_state); | |
1034 | if (XENBUS_EXIST_ERR(err)) | |
1035 | return; | |
1036 | ||
1037 | /* physical SCSI device */ | |
1038 | snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent); | |
1039 | val = xenbus_read(XBT_NIL, dev->nodename, str, NULL); | |
1040 | if (IS_ERR(val)) { | |
7c63ca24 | 1041 | err = xenbus_printf(XBT_NIL, dev->nodename, state, |
d9d660f6 | 1042 | "%d", XenbusStateClosed); |
7c63ca24 ZJ |
1043 | if (err) |
1044 | xenbus_dev_error(info->dev, err, | |
1045 | "%s: writing %s", __func__, state); | |
d9d660f6 JG |
1046 | return; |
1047 | } | |
1048 | strlcpy(phy, val, VSCSI_NAMELEN); | |
1049 | kfree(val); | |
1050 | ||
1051 | /* virtual SCSI device */ | |
1052 | snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", ent); | |
1053 | err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u", | |
1054 | &vir.hst, &vir.chn, &vir.tgt, &vir.lun); | |
1055 | if (XENBUS_EXIST_ERR(err)) { | |
7c63ca24 | 1056 | err = xenbus_printf(XBT_NIL, dev->nodename, state, |
d9d660f6 | 1057 | "%d", XenbusStateClosed); |
7c63ca24 ZJ |
1058 | if (err) |
1059 | xenbus_dev_error(info->dev, err, | |
1060 | "%s: writing %s", __func__, state); | |
d9d660f6 JG |
1061 | return; |
1062 | } | |
1063 | ||
1064 | switch (op) { | |
1065 | case VSCSIBACK_OP_ADD_OR_DEL_LUN: | |
169e6cf0 JG |
1066 | switch (device_state) { |
1067 | case XenbusStateInitialising: | |
1068 | scsiback_do_add_lun(info, state, phy, &vir, 0); | |
1069 | break; | |
1070 | case XenbusStateConnected: | |
1071 | scsiback_do_add_lun(info, state, phy, &vir, 1); | |
1072 | break; | |
1073 | case XenbusStateClosing: | |
d9d660f6 | 1074 | scsiback_do_del_lun(info, state, &vir); |
169e6cf0 JG |
1075 | break; |
1076 | default: | |
1077 | break; | |
1078 | } | |
d9d660f6 JG |
1079 | break; |
1080 | ||
1081 | case VSCSIBACK_OP_UPDATEDEV_STATE: | |
1082 | if (device_state == XenbusStateInitialised) { | |
1083 | /* modify vscsi-devs/dev-x/state */ | |
1084 | if (xenbus_printf(XBT_NIL, dev->nodename, state, | |
1085 | "%d", XenbusStateConnected)) { | |
78574878 | 1086 | pr_err("xenbus_printf error %s\n", str); |
d9d660f6 JG |
1087 | scsiback_del_translation_entry(info, &vir); |
1088 | xenbus_printf(XBT_NIL, dev->nodename, state, | |
1089 | "%d", XenbusStateClosed); | |
1090 | } | |
1091 | } | |
1092 | break; | |
78574878 | 1093 | /* When it is necessary, processing is added here. */ |
d9d660f6 JG |
1094 | default: |
1095 | break; | |
1096 | } | |
1097 | } | |
1098 | ||
1099 | static void scsiback_do_lun_hotplug(struct vscsibk_info *info, int op) | |
1100 | { | |
1101 | int i; | |
1102 | char **dir; | |
1103 | unsigned int ndir = 0; | |
1104 | ||
1105 | dir = xenbus_directory(XBT_NIL, info->dev->nodename, "vscsi-devs", | |
1106 | &ndir); | |
1107 | if (IS_ERR(dir)) | |
1108 | return; | |
1109 | ||
1110 | for (i = 0; i < ndir; i++) | |
1111 | scsiback_do_1lun_hotplug(info, op, dir[i]); | |
1112 | ||
1113 | kfree(dir); | |
1114 | } | |
1115 | ||
1116 | static void scsiback_frontend_changed(struct xenbus_device *dev, | |
1117 | enum xenbus_state frontend_state) | |
1118 | { | |
1119 | struct vscsibk_info *info = dev_get_drvdata(&dev->dev); | |
1120 | ||
1121 | switch (frontend_state) { | |
1122 | case XenbusStateInitialising: | |
1123 | break; | |
1124 | ||
1125 | case XenbusStateInitialised: | |
1126 | if (scsiback_map(info)) | |
1127 | break; | |
1128 | ||
1129 | scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); | |
1130 | xenbus_switch_state(dev, XenbusStateConnected); | |
1131 | break; | |
1132 | ||
1133 | case XenbusStateConnected: | |
1134 | scsiback_do_lun_hotplug(info, VSCSIBACK_OP_UPDATEDEV_STATE); | |
1135 | ||
1136 | if (dev->state == XenbusStateConnected) | |
1137 | break; | |
1138 | ||
1139 | xenbus_switch_state(dev, XenbusStateConnected); | |
1140 | break; | |
1141 | ||
1142 | case XenbusStateClosing: | |
1143 | if (info->irq) | |
1144 | scsiback_disconnect(info); | |
1145 | ||
1146 | xenbus_switch_state(dev, XenbusStateClosing); | |
1147 | break; | |
1148 | ||
1149 | case XenbusStateClosed: | |
1150 | xenbus_switch_state(dev, XenbusStateClosed); | |
1151 | if (xenbus_dev_is_online(dev)) | |
1152 | break; | |
df561f66 | 1153 | fallthrough; /* if not online */ |
d9d660f6 JG |
1154 | case XenbusStateUnknown: |
1155 | device_unregister(&dev->dev); | |
1156 | break; | |
1157 | ||
1158 | case XenbusStateReconfiguring: | |
1159 | scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); | |
1160 | xenbus_switch_state(dev, XenbusStateReconfigured); | |
1161 | ||
1162 | break; | |
1163 | ||
1164 | default: | |
1165 | xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", | |
1166 | frontend_state); | |
1167 | break; | |
1168 | } | |
1169 | } | |
1170 | ||
1171 | /* | |
1172 | Release the translation entry specfied | |
1173 | */ | |
1174 | static void scsiback_release_translation_entry(struct vscsibk_info *info) | |
1175 | { | |
1176 | struct v2p_entry *entry, *tmp; | |
1177 | struct list_head *head = &(info->v2p_entry_lists); | |
1178 | unsigned long flags; | |
1179 | ||
1180 | spin_lock_irqsave(&info->v2p_lock, flags); | |
1181 | ||
1182 | list_for_each_entry_safe(entry, tmp, head, l) | |
1183 | __scsiback_del_translation_entry(entry); | |
1184 | ||
1185 | spin_unlock_irqrestore(&info->v2p_lock, flags); | |
1186 | } | |
1187 | ||
1188 | static int scsiback_remove(struct xenbus_device *dev) | |
1189 | { | |
1190 | struct vscsibk_info *info = dev_get_drvdata(&dev->dev); | |
1191 | ||
1192 | if (info->irq) | |
1193 | scsiback_disconnect(info); | |
1194 | ||
1195 | scsiback_release_translation_entry(info); | |
1196 | ||
ca33479c JG |
1197 | gnttab_page_cache_shrink(&info->free_pages, 0); |
1198 | ||
d9d660f6 JG |
1199 | dev_set_drvdata(&dev->dev, NULL); |
1200 | ||
1201 | return 0; | |
1202 | } | |
1203 | ||
1204 | static int scsiback_probe(struct xenbus_device *dev, | |
1205 | const struct xenbus_device_id *id) | |
1206 | { | |
1207 | int err; | |
1208 | ||
1209 | struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info), | |
1210 | GFP_KERNEL); | |
1211 | ||
78574878 | 1212 | pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id); |
d9d660f6 JG |
1213 | |
1214 | if (!info) { | |
1215 | xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure"); | |
1216 | return -ENOMEM; | |
1217 | } | |
1218 | info->dev = dev; | |
1219 | dev_set_drvdata(&dev->dev, info); | |
1220 | ||
1221 | info->domid = dev->otherend_id; | |
1222 | spin_lock_init(&info->ring_lock); | |
d9d660f6 JG |
1223 | atomic_set(&info->nr_unreplied_reqs, 0); |
1224 | init_waitqueue_head(&info->waiting_to_free); | |
1225 | info->dev = dev; | |
1226 | info->irq = 0; | |
1227 | INIT_LIST_HEAD(&info->v2p_entry_lists); | |
1228 | spin_lock_init(&info->v2p_lock); | |
ca33479c | 1229 | gnttab_page_cache_init(&info->free_pages); |
d9d660f6 JG |
1230 | |
1231 | err = xenbus_printf(XBT_NIL, dev->nodename, "feature-sg-grant", "%u", | |
1232 | SG_ALL); | |
1233 | if (err) | |
1234 | xenbus_dev_error(dev, err, "writing feature-sg-grant"); | |
1235 | ||
1236 | err = xenbus_switch_state(dev, XenbusStateInitWait); | |
1237 | if (err) | |
1238 | goto fail; | |
1239 | ||
1240 | return 0; | |
1241 | ||
1242 | fail: | |
78574878 | 1243 | pr_warn("%s failed\n", __func__); |
d9d660f6 JG |
1244 | scsiback_remove(dev); |
1245 | ||
1246 | return err; | |
1247 | } | |
1248 | ||
1249 | static char *scsiback_dump_proto_id(struct scsiback_tport *tport) | |
1250 | { | |
1251 | switch (tport->tport_proto_id) { | |
1252 | case SCSI_PROTOCOL_SAS: | |
1253 | return "SAS"; | |
1254 | case SCSI_PROTOCOL_FCP: | |
1255 | return "FCP"; | |
1256 | case SCSI_PROTOCOL_ISCSI: | |
1257 | return "iSCSI"; | |
1258 | default: | |
1259 | break; | |
1260 | } | |
1261 | ||
1262 | return "Unknown"; | |
1263 | } | |
1264 | ||
d9d660f6 JG |
1265 | static char *scsiback_get_fabric_wwn(struct se_portal_group *se_tpg) |
1266 | { | |
1267 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1268 | struct scsiback_tpg, se_tpg); | |
1269 | struct scsiback_tport *tport = tpg->tport; | |
1270 | ||
1271 | return &tport->tport_name[0]; | |
1272 | } | |
1273 | ||
1274 | static u16 scsiback_get_tag(struct se_portal_group *se_tpg) | |
1275 | { | |
1276 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1277 | struct scsiback_tpg, se_tpg); | |
1278 | return tpg->tport_tpgt; | |
1279 | } | |
1280 | ||
d9d660f6 JG |
1281 | static struct se_wwn * |
1282 | scsiback_make_tport(struct target_fabric_configfs *tf, | |
1283 | struct config_group *group, | |
1284 | const char *name) | |
1285 | { | |
1286 | struct scsiback_tport *tport; | |
1287 | char *ptr; | |
1288 | u64 wwpn = 0; | |
1289 | int off = 0; | |
1290 | ||
1291 | tport = kzalloc(sizeof(struct scsiback_tport), GFP_KERNEL); | |
1292 | if (!tport) | |
1293 | return ERR_PTR(-ENOMEM); | |
1294 | ||
1295 | tport->tport_wwpn = wwpn; | |
1296 | /* | |
1297 | * Determine the emulated Protocol Identifier and Target Port Name | |
1298 | * based on the incoming configfs directory name. | |
1299 | */ | |
1300 | ptr = strstr(name, "naa."); | |
1301 | if (ptr) { | |
1302 | tport->tport_proto_id = SCSI_PROTOCOL_SAS; | |
1303 | goto check_len; | |
1304 | } | |
1305 | ptr = strstr(name, "fc."); | |
1306 | if (ptr) { | |
1307 | tport->tport_proto_id = SCSI_PROTOCOL_FCP; | |
1308 | off = 3; /* Skip over "fc." */ | |
1309 | goto check_len; | |
1310 | } | |
1311 | ptr = strstr(name, "iqn."); | |
1312 | if (ptr) { | |
1313 | tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; | |
1314 | goto check_len; | |
1315 | } | |
1316 | ||
1317 | pr_err("Unable to locate prefix for emulated Target Port: %s\n", name); | |
1318 | kfree(tport); | |
1319 | return ERR_PTR(-EINVAL); | |
1320 | ||
1321 | check_len: | |
1322 | if (strlen(name) >= VSCSI_NAMELEN) { | |
1323 | pr_err("Emulated %s Address: %s, exceeds max: %d\n", name, | |
1324 | scsiback_dump_proto_id(tport), VSCSI_NAMELEN); | |
1325 | kfree(tport); | |
1326 | return ERR_PTR(-EINVAL); | |
1327 | } | |
1328 | snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]); | |
1329 | ||
78574878 | 1330 | pr_debug("Allocated emulated Target %s Address: %s\n", |
d9d660f6 JG |
1331 | scsiback_dump_proto_id(tport), name); |
1332 | ||
1333 | return &tport->tport_wwn; | |
1334 | } | |
1335 | ||
1336 | static void scsiback_drop_tport(struct se_wwn *wwn) | |
1337 | { | |
1338 | struct scsiback_tport *tport = container_of(wwn, | |
1339 | struct scsiback_tport, tport_wwn); | |
1340 | ||
78574878 | 1341 | pr_debug("Deallocating emulated Target %s Address: %s\n", |
d9d660f6 JG |
1342 | scsiback_dump_proto_id(tport), tport->tport_name); |
1343 | ||
1344 | kfree(tport); | |
1345 | } | |
1346 | ||
d9d660f6 JG |
1347 | static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg) |
1348 | { | |
1349 | return 1; | |
1350 | } | |
1351 | ||
1352 | static int scsiback_check_stop_free(struct se_cmd *se_cmd) | |
1353 | { | |
fa22e7b7 | 1354 | return transport_generic_free_cmd(se_cmd, 0); |
d9d660f6 JG |
1355 | } |
1356 | ||
1357 | static void scsiback_release_cmd(struct se_cmd *se_cmd) | |
1358 | { | |
83c2b54b | 1359 | target_free_tag(se_cmd->se_sess, se_cmd); |
d9d660f6 JG |
1360 | } |
1361 | ||
d9d660f6 JG |
1362 | static u32 scsiback_sess_get_index(struct se_session *se_sess) |
1363 | { | |
1364 | return 0; | |
1365 | } | |
1366 | ||
1367 | static int scsiback_write_pending(struct se_cmd *se_cmd) | |
1368 | { | |
1369 | /* Go ahead and process the write immediately */ | |
1370 | target_execute_cmd(se_cmd); | |
1371 | ||
1372 | return 0; | |
1373 | } | |
1374 | ||
d9d660f6 JG |
1375 | static void scsiback_set_default_node_attrs(struct se_node_acl *nacl) |
1376 | { | |
1377 | } | |
1378 | ||
d9d660f6 JG |
1379 | static int scsiback_get_cmd_state(struct se_cmd *se_cmd) |
1380 | { | |
1381 | return 0; | |
1382 | } | |
1383 | ||
1384 | static int scsiback_queue_data_in(struct se_cmd *se_cmd) | |
1385 | { | |
1386 | struct vscsibk_pend *pending_req = container_of(se_cmd, | |
1387 | struct vscsibk_pend, se_cmd); | |
1388 | ||
1389 | pending_req->result = SAM_STAT_GOOD; | |
1390 | scsiback_cmd_done(pending_req); | |
1391 | return 0; | |
1392 | } | |
1393 | ||
1394 | static int scsiback_queue_status(struct se_cmd *se_cmd) | |
1395 | { | |
1396 | struct vscsibk_pend *pending_req = container_of(se_cmd, | |
1397 | struct vscsibk_pend, se_cmd); | |
1398 | ||
1399 | if (se_cmd->sense_buffer && | |
1400 | ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || | |
1401 | (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) | |
464a00c9 | 1402 | pending_req->result = SAM_STAT_CHECK_CONDITION; |
d9d660f6 JG |
1403 | else |
1404 | pending_req->result = se_cmd->scsi_status; | |
1405 | ||
1406 | scsiback_cmd_done(pending_req); | |
1407 | return 0; | |
1408 | } | |
1409 | ||
1410 | static void scsiback_queue_tm_rsp(struct se_cmd *se_cmd) | |
1411 | { | |
9f4ab18a BVA |
1412 | struct vscsibk_pend *pending_req = container_of(se_cmd, |
1413 | struct vscsibk_pend, se_cmd); | |
d9d660f6 | 1414 | |
e3eac124 | 1415 | complete(&pending_req->tmr_done); |
d9d660f6 JG |
1416 | } |
1417 | ||
1418 | static void scsiback_aborted_task(struct se_cmd *se_cmd) | |
1419 | { | |
1420 | } | |
1421 | ||
2eafd729 | 1422 | static ssize_t scsiback_tpg_param_alias_show(struct config_item *item, |
d9d660f6 JG |
1423 | char *page) |
1424 | { | |
2eafd729 | 1425 | struct se_portal_group *se_tpg = param_to_tpg(item); |
d9d660f6 JG |
1426 | struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, |
1427 | se_tpg); | |
1428 | ssize_t rb; | |
1429 | ||
1430 | mutex_lock(&tpg->tv_tpg_mutex); | |
1431 | rb = snprintf(page, PAGE_SIZE, "%s\n", tpg->param_alias); | |
1432 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1433 | ||
1434 | return rb; | |
1435 | } | |
1436 | ||
2eafd729 | 1437 | static ssize_t scsiback_tpg_param_alias_store(struct config_item *item, |
d9d660f6 JG |
1438 | const char *page, size_t count) |
1439 | { | |
2eafd729 | 1440 | struct se_portal_group *se_tpg = param_to_tpg(item); |
d9d660f6 JG |
1441 | struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, |
1442 | se_tpg); | |
1443 | int len; | |
1444 | ||
1445 | if (strlen(page) >= VSCSI_NAMELEN) { | |
1446 | pr_err("param alias: %s, exceeds max: %d\n", page, | |
1447 | VSCSI_NAMELEN); | |
1448 | return -EINVAL; | |
1449 | } | |
1450 | ||
1451 | mutex_lock(&tpg->tv_tpg_mutex); | |
1452 | len = snprintf(tpg->param_alias, VSCSI_NAMELEN, "%s", page); | |
1453 | if (tpg->param_alias[len - 1] == '\n') | |
1454 | tpg->param_alias[len - 1] = '\0'; | |
1455 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1456 | ||
1457 | return count; | |
1458 | } | |
1459 | ||
2eafd729 | 1460 | CONFIGFS_ATTR(scsiback_tpg_param_, alias); |
d9d660f6 JG |
1461 | |
1462 | static struct configfs_attribute *scsiback_param_attrs[] = { | |
2eafd729 | 1463 | &scsiback_tpg_param_attr_alias, |
d9d660f6 JG |
1464 | NULL, |
1465 | }; | |
1466 | ||
fb444abe CH |
1467 | static int scsiback_alloc_sess_cb(struct se_portal_group *se_tpg, |
1468 | struct se_session *se_sess, void *p) | |
1469 | { | |
1470 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1471 | struct scsiback_tpg, se_tpg); | |
1472 | ||
1473 | tpg->tpg_nexus = p; | |
1474 | return 0; | |
1475 | } | |
1476 | ||
d9d660f6 JG |
1477 | static int scsiback_make_nexus(struct scsiback_tpg *tpg, |
1478 | const char *name) | |
1479 | { | |
d9d660f6 | 1480 | struct scsiback_nexus *tv_nexus; |
fb444abe | 1481 | int ret = 0; |
d9d660f6 JG |
1482 | |
1483 | mutex_lock(&tpg->tv_tpg_mutex); | |
1484 | if (tpg->tpg_nexus) { | |
d9d660f6 | 1485 | pr_debug("tpg->tpg_nexus already exists\n"); |
fb444abe CH |
1486 | ret = -EEXIST; |
1487 | goto out_unlock; | |
d9d660f6 | 1488 | } |
d9d660f6 JG |
1489 | |
1490 | tv_nexus = kzalloc(sizeof(struct scsiback_nexus), GFP_KERNEL); | |
1491 | if (!tv_nexus) { | |
fb444abe CH |
1492 | ret = -ENOMEM; |
1493 | goto out_unlock; | |
d9d660f6 | 1494 | } |
fb444abe | 1495 | |
fa834287 | 1496 | tv_nexus->tvn_se_sess = target_setup_session(&tpg->se_tpg, |
2dbcdf33 NB |
1497 | VSCSI_DEFAULT_SESSION_TAGS, |
1498 | sizeof(struct vscsibk_pend), | |
fb444abe CH |
1499 | TARGET_PROT_NORMAL, name, |
1500 | tv_nexus, scsiback_alloc_sess_cb); | |
d9d660f6 | 1501 | if (IS_ERR(tv_nexus->tvn_se_sess)) { |
d9d660f6 | 1502 | kfree(tv_nexus); |
fb444abe CH |
1503 | ret = -ENOMEM; |
1504 | goto out_unlock; | |
d9d660f6 | 1505 | } |
d9d660f6 | 1506 | |
fb444abe | 1507 | out_unlock: |
d9d660f6 | 1508 | mutex_unlock(&tpg->tv_tpg_mutex); |
fb444abe | 1509 | return ret; |
d9d660f6 JG |
1510 | } |
1511 | ||
1512 | static int scsiback_drop_nexus(struct scsiback_tpg *tpg) | |
1513 | { | |
1514 | struct se_session *se_sess; | |
1515 | struct scsiback_nexus *tv_nexus; | |
1516 | ||
1517 | mutex_lock(&tpg->tv_tpg_mutex); | |
1518 | tv_nexus = tpg->tpg_nexus; | |
1519 | if (!tv_nexus) { | |
1520 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1521 | return -ENODEV; | |
1522 | } | |
1523 | ||
1524 | se_sess = tv_nexus->tvn_se_sess; | |
1525 | if (!se_sess) { | |
1526 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1527 | return -ENODEV; | |
1528 | } | |
1529 | ||
1530 | if (tpg->tv_tpg_port_count != 0) { | |
1531 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1532 | pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG port count: %d\n", | |
1533 | tpg->tv_tpg_port_count); | |
1534 | return -EBUSY; | |
1535 | } | |
1536 | ||
1537 | if (tpg->tv_tpg_fe_count != 0) { | |
1538 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1539 | pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG frontend count: %d\n", | |
1540 | tpg->tv_tpg_fe_count); | |
1541 | return -EBUSY; | |
1542 | } | |
1543 | ||
78574878 | 1544 | pr_debug("Removing I_T Nexus to emulated %s Initiator Port: %s\n", |
d9d660f6 JG |
1545 | scsiback_dump_proto_id(tpg->tport), |
1546 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
1547 | ||
1548 | /* | |
1549 | * Release the SCSI I_T Nexus to the emulated xen-pvscsi Target Port | |
1550 | */ | |
25b88550 | 1551 | target_remove_session(se_sess); |
d9d660f6 JG |
1552 | tpg->tpg_nexus = NULL; |
1553 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1554 | ||
1555 | kfree(tv_nexus); | |
1556 | return 0; | |
1557 | } | |
1558 | ||
2eafd729 | 1559 | static ssize_t scsiback_tpg_nexus_show(struct config_item *item, char *page) |
d9d660f6 | 1560 | { |
2eafd729 | 1561 | struct se_portal_group *se_tpg = to_tpg(item); |
d9d660f6 JG |
1562 | struct scsiback_tpg *tpg = container_of(se_tpg, |
1563 | struct scsiback_tpg, se_tpg); | |
1564 | struct scsiback_nexus *tv_nexus; | |
1565 | ssize_t ret; | |
1566 | ||
1567 | mutex_lock(&tpg->tv_tpg_mutex); | |
1568 | tv_nexus = tpg->tpg_nexus; | |
1569 | if (!tv_nexus) { | |
1570 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1571 | return -ENODEV; | |
1572 | } | |
1573 | ret = snprintf(page, PAGE_SIZE, "%s\n", | |
1574 | tv_nexus->tvn_se_sess->se_node_acl->initiatorname); | |
1575 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1576 | ||
1577 | return ret; | |
1578 | } | |
1579 | ||
2eafd729 CH |
1580 | static ssize_t scsiback_tpg_nexus_store(struct config_item *item, |
1581 | const char *page, size_t count) | |
d9d660f6 | 1582 | { |
2eafd729 | 1583 | struct se_portal_group *se_tpg = to_tpg(item); |
d9d660f6 JG |
1584 | struct scsiback_tpg *tpg = container_of(se_tpg, |
1585 | struct scsiback_tpg, se_tpg); | |
1586 | struct scsiback_tport *tport_wwn = tpg->tport; | |
1587 | unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr; | |
1588 | int ret; | |
1589 | /* | |
78574878 | 1590 | * Shutdown the active I_T nexus if 'NULL' is passed. |
d9d660f6 JG |
1591 | */ |
1592 | if (!strncmp(page, "NULL", 4)) { | |
1593 | ret = scsiback_drop_nexus(tpg); | |
1594 | return (!ret) ? count : ret; | |
1595 | } | |
1596 | /* | |
1597 | * Otherwise make sure the passed virtual Initiator port WWN matches | |
1598 | * the fabric protocol_id set in scsiback_make_tport(), and call | |
1599 | * scsiback_make_nexus(). | |
1600 | */ | |
1601 | if (strlen(page) >= VSCSI_NAMELEN) { | |
1602 | pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n", | |
1603 | page, VSCSI_NAMELEN); | |
1604 | return -EINVAL; | |
1605 | } | |
1606 | snprintf(&i_port[0], VSCSI_NAMELEN, "%s", page); | |
1607 | ||
1608 | ptr = strstr(i_port, "naa."); | |
1609 | if (ptr) { | |
1610 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { | |
1611 | pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n", | |
1612 | i_port, scsiback_dump_proto_id(tport_wwn)); | |
1613 | return -EINVAL; | |
1614 | } | |
1615 | port_ptr = &i_port[0]; | |
1616 | goto check_newline; | |
1617 | } | |
1618 | ptr = strstr(i_port, "fc."); | |
1619 | if (ptr) { | |
1620 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { | |
1621 | pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n", | |
1622 | i_port, scsiback_dump_proto_id(tport_wwn)); | |
1623 | return -EINVAL; | |
1624 | } | |
1625 | port_ptr = &i_port[3]; /* Skip over "fc." */ | |
1626 | goto check_newline; | |
1627 | } | |
1628 | ptr = strstr(i_port, "iqn."); | |
1629 | if (ptr) { | |
1630 | if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { | |
1631 | pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n", | |
1632 | i_port, scsiback_dump_proto_id(tport_wwn)); | |
1633 | return -EINVAL; | |
1634 | } | |
1635 | port_ptr = &i_port[0]; | |
1636 | goto check_newline; | |
1637 | } | |
1638 | pr_err("Unable to locate prefix for emulated Initiator Port: %s\n", | |
1639 | i_port); | |
1640 | return -EINVAL; | |
1641 | /* | |
1642 | * Clear any trailing newline for the NAA WWN | |
1643 | */ | |
1644 | check_newline: | |
1645 | if (i_port[strlen(i_port) - 1] == '\n') | |
1646 | i_port[strlen(i_port) - 1] = '\0'; | |
1647 | ||
1648 | ret = scsiback_make_nexus(tpg, port_ptr); | |
1649 | if (ret < 0) | |
1650 | return ret; | |
1651 | ||
1652 | return count; | |
1653 | } | |
1654 | ||
2eafd729 | 1655 | CONFIGFS_ATTR(scsiback_tpg_, nexus); |
d9d660f6 JG |
1656 | |
1657 | static struct configfs_attribute *scsiback_tpg_attrs[] = { | |
2eafd729 | 1658 | &scsiback_tpg_attr_nexus, |
d9d660f6 JG |
1659 | NULL, |
1660 | }; | |
1661 | ||
1662 | static ssize_t | |
2eafd729 | 1663 | scsiback_wwn_version_show(struct config_item *item, char *page) |
d9d660f6 JG |
1664 | { |
1665 | return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on " | |
1666 | UTS_RELEASE"\n", | |
1667 | VSCSI_VERSION, utsname()->sysname, utsname()->machine); | |
1668 | } | |
1669 | ||
2eafd729 | 1670 | CONFIGFS_ATTR_RO(scsiback_wwn_, version); |
d9d660f6 JG |
1671 | |
1672 | static struct configfs_attribute *scsiback_wwn_attrs[] = { | |
2eafd729 | 1673 | &scsiback_wwn_attr_version, |
d9d660f6 JG |
1674 | NULL, |
1675 | }; | |
1676 | ||
d9d660f6 JG |
1677 | static int scsiback_port_link(struct se_portal_group *se_tpg, |
1678 | struct se_lun *lun) | |
1679 | { | |
1680 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1681 | struct scsiback_tpg, se_tpg); | |
1682 | ||
1683 | mutex_lock(&tpg->tv_tpg_mutex); | |
1684 | tpg->tv_tpg_port_count++; | |
1685 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1686 | ||
1687 | return 0; | |
1688 | } | |
1689 | ||
1690 | static void scsiback_port_unlink(struct se_portal_group *se_tpg, | |
1691 | struct se_lun *lun) | |
1692 | { | |
1693 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1694 | struct scsiback_tpg, se_tpg); | |
1695 | ||
1696 | mutex_lock(&tpg->tv_tpg_mutex); | |
1697 | tpg->tv_tpg_port_count--; | |
1698 | mutex_unlock(&tpg->tv_tpg_mutex); | |
1699 | } | |
1700 | ||
1701 | static struct se_portal_group * | |
aa090eab | 1702 | scsiback_make_tpg(struct se_wwn *wwn, const char *name) |
d9d660f6 JG |
1703 | { |
1704 | struct scsiback_tport *tport = container_of(wwn, | |
1705 | struct scsiback_tport, tport_wwn); | |
1706 | ||
1707 | struct scsiback_tpg *tpg; | |
495daef9 | 1708 | u16 tpgt; |
d9d660f6 JG |
1709 | int ret; |
1710 | ||
1711 | if (strstr(name, "tpgt_") != name) | |
1712 | return ERR_PTR(-EINVAL); | |
495daef9 DC |
1713 | ret = kstrtou16(name + 5, 10, &tpgt); |
1714 | if (ret) | |
1715 | return ERR_PTR(ret); | |
d9d660f6 JG |
1716 | |
1717 | tpg = kzalloc(sizeof(struct scsiback_tpg), GFP_KERNEL); | |
1718 | if (!tpg) | |
1719 | return ERR_PTR(-ENOMEM); | |
1720 | ||
1721 | mutex_init(&tpg->tv_tpg_mutex); | |
1722 | INIT_LIST_HEAD(&tpg->tv_tpg_list); | |
1723 | INIT_LIST_HEAD(&tpg->info_list); | |
1724 | tpg->tport = tport; | |
1725 | tpg->tport_tpgt = tpgt; | |
1726 | ||
bc0c94b1 | 1727 | ret = core_tpg_register(wwn, &tpg->se_tpg, tport->tport_proto_id); |
d9d660f6 JG |
1728 | if (ret < 0) { |
1729 | kfree(tpg); | |
1730 | return NULL; | |
1731 | } | |
1732 | mutex_lock(&scsiback_mutex); | |
1733 | list_add_tail(&tpg->tv_tpg_list, &scsiback_list); | |
1734 | mutex_unlock(&scsiback_mutex); | |
1735 | ||
1736 | return &tpg->se_tpg; | |
1737 | } | |
1738 | ||
1739 | static void scsiback_drop_tpg(struct se_portal_group *se_tpg) | |
1740 | { | |
1741 | struct scsiback_tpg *tpg = container_of(se_tpg, | |
1742 | struct scsiback_tpg, se_tpg); | |
1743 | ||
1744 | mutex_lock(&scsiback_mutex); | |
1745 | list_del(&tpg->tv_tpg_list); | |
1746 | mutex_unlock(&scsiback_mutex); | |
1747 | /* | |
1748 | * Release the virtual I_T Nexus for this xen-pvscsi TPG | |
1749 | */ | |
1750 | scsiback_drop_nexus(tpg); | |
1751 | /* | |
78574878 | 1752 | * Deregister the se_tpg from TCM. |
d9d660f6 JG |
1753 | */ |
1754 | core_tpg_deregister(se_tpg); | |
1755 | kfree(tpg); | |
1756 | } | |
1757 | ||
1758 | static int scsiback_check_true(struct se_portal_group *se_tpg) | |
1759 | { | |
1760 | return 1; | |
1761 | } | |
1762 | ||
1763 | static int scsiback_check_false(struct se_portal_group *se_tpg) | |
1764 | { | |
1765 | return 0; | |
1766 | } | |
1767 | ||
9ac8928e CH |
1768 | static const struct target_core_fabric_ops scsiback_ops = { |
1769 | .module = THIS_MODULE, | |
30c7ca93 | 1770 | .fabric_name = "xen-pvscsi", |
d9d660f6 JG |
1771 | .tpg_get_wwn = scsiback_get_fabric_wwn, |
1772 | .tpg_get_tag = scsiback_get_tag, | |
d9d660f6 JG |
1773 | .tpg_check_demo_mode = scsiback_check_true, |
1774 | .tpg_check_demo_mode_cache = scsiback_check_true, | |
1775 | .tpg_check_demo_mode_write_protect = scsiback_check_false, | |
1776 | .tpg_check_prod_mode_write_protect = scsiback_check_false, | |
d9d660f6 JG |
1777 | .tpg_get_inst_index = scsiback_tpg_get_inst_index, |
1778 | .check_stop_free = scsiback_check_stop_free, | |
1779 | .release_cmd = scsiback_release_cmd, | |
d9d660f6 JG |
1780 | .sess_get_index = scsiback_sess_get_index, |
1781 | .sess_get_initiator_sid = NULL, | |
1782 | .write_pending = scsiback_write_pending, | |
d9d660f6 | 1783 | .set_default_node_attributes = scsiback_set_default_node_attrs, |
d9d660f6 JG |
1784 | .get_cmd_state = scsiback_get_cmd_state, |
1785 | .queue_data_in = scsiback_queue_data_in, | |
1786 | .queue_status = scsiback_queue_status, | |
1787 | .queue_tm_rsp = scsiback_queue_tm_rsp, | |
1788 | .aborted_task = scsiback_aborted_task, | |
1789 | /* | |
1790 | * Setup callers for generic logic in target_core_fabric_configfs.c | |
1791 | */ | |
1792 | .fabric_make_wwn = scsiback_make_tport, | |
1793 | .fabric_drop_wwn = scsiback_drop_tport, | |
1794 | .fabric_make_tpg = scsiback_make_tpg, | |
1795 | .fabric_drop_tpg = scsiback_drop_tpg, | |
1796 | .fabric_post_link = scsiback_port_link, | |
1797 | .fabric_pre_unlink = scsiback_port_unlink, | |
d9d660f6 | 1798 | |
9ac8928e CH |
1799 | .tfc_wwn_attrs = scsiback_wwn_attrs, |
1800 | .tfc_tpg_base_attrs = scsiback_tpg_attrs, | |
1801 | .tfc_tpg_param_attrs = scsiback_param_attrs, | |
d9d660f6 JG |
1802 | }; |
1803 | ||
1804 | static const struct xenbus_device_id scsiback_ids[] = { | |
1805 | { "vscsi" }, | |
1806 | { "" } | |
1807 | }; | |
1808 | ||
95afae48 DV |
1809 | static struct xenbus_driver scsiback_driver = { |
1810 | .ids = scsiback_ids, | |
d9d660f6 JG |
1811 | .probe = scsiback_probe, |
1812 | .remove = scsiback_remove, | |
1813 | .otherend_changed = scsiback_frontend_changed | |
95afae48 | 1814 | }; |
d9d660f6 | 1815 | |
d9d660f6 JG |
1816 | static int __init scsiback_init(void) |
1817 | { | |
1818 | int ret; | |
1819 | ||
1820 | if (!xen_domain()) | |
1821 | return -ENODEV; | |
1822 | ||
9ac8928e CH |
1823 | pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n", |
1824 | VSCSI_VERSION, utsname()->sysname, utsname()->machine); | |
1825 | ||
d9d660f6 JG |
1826 | ret = xenbus_register_backend(&scsiback_driver); |
1827 | if (ret) | |
2dbcdf33 | 1828 | goto out; |
d9d660f6 | 1829 | |
9ac8928e | 1830 | ret = target_register_template(&scsiback_ops); |
d9d660f6 JG |
1831 | if (ret) |
1832 | goto out_unregister_xenbus; | |
1833 | ||
1834 | return 0; | |
1835 | ||
1836 | out_unregister_xenbus: | |
1837 | xenbus_unregister_driver(&scsiback_driver); | |
2dbcdf33 | 1838 | out: |
78574878 | 1839 | pr_err("%s: error %d\n", __func__, ret); |
d9d660f6 JG |
1840 | return ret; |
1841 | } | |
1842 | ||
1843 | static void __exit scsiback_exit(void) | |
1844 | { | |
9ac8928e | 1845 | target_unregister_template(&scsiback_ops); |
d9d660f6 | 1846 | xenbus_unregister_driver(&scsiback_driver); |
d9d660f6 JG |
1847 | } |
1848 | ||
1849 | module_init(scsiback_init); | |
1850 | module_exit(scsiback_exit); | |
1851 | ||
1852 | MODULE_DESCRIPTION("Xen SCSI backend driver"); | |
1853 | MODULE_LICENSE("Dual BSD/GPL"); | |
1854 | MODULE_ALIAS("xen-backend:vscsi"); | |
1855 | MODULE_AUTHOR("Juergen Gross <jgross@suse.com>"); |