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