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MAINTAINERS: Add phy-miphy28lp.c and phy-miphy365x.c to ARCH/STI architecture
[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 #include <stdarg.h>
35
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
50 #include <scsi/scsi.h>
51 #include <scsi/scsi_dbg.h>
52 #include <scsi/scsi_eh.h>
53 #include <scsi/scsi_tcq.h>
54
55 #include <target/target_core_base.h>
56 #include <target/target_core_fabric.h>
57 #include <target/target_core_configfs.h>
58 #include <target/target_core_fabric_configfs.h>
59
60 #include <asm/hypervisor.h>
61
62 #include <xen/xen.h>
63 #include <xen/balloon.h>
64 #include <xen/events.h>
65 #include <xen/xenbus.h>
66 #include <xen/grant_table.h>
67 #include <xen/page.h>
68
69 #include <xen/interface/grant_table.h>
70 #include <xen/interface/io/vscsiif.h>
71
72 #define DPRINTK(_f, _a...) \
73 pr_debug("(file=%s, line=%d) " _f, __FILE__ , __LINE__ , ## _a)
74
75 #define VSCSI_VERSION "v0.1"
76 #define VSCSI_NAMELEN 32
77
78 struct ids_tuple {
79 unsigned int hst; /* host */
80 unsigned int chn; /* channel */
81 unsigned int tgt; /* target */
82 unsigned int lun; /* LUN */
83 };
84
85 struct v2p_entry {
86 struct ids_tuple v; /* translate from */
87 struct scsiback_tpg *tpg; /* translate to */
88 unsigned int lun;
89 struct kref kref;
90 struct list_head l;
91 };
92
93 struct vscsibk_info {
94 struct xenbus_device *dev;
95
96 domid_t domid;
97 unsigned int irq;
98
99 struct vscsiif_back_ring ring;
100 int ring_error;
101
102 spinlock_t ring_lock;
103 atomic_t nr_unreplied_reqs;
104
105 spinlock_t v2p_lock;
106 struct list_head v2p_entry_lists;
107
108 wait_queue_head_t waiting_to_free;
109 };
110
111 /* theoretical maximum of grants for one request */
112 #define VSCSI_MAX_GRANTS (SG_ALL + VSCSIIF_SG_TABLESIZE)
113
114 /*
115 * VSCSI_GRANT_BATCH is the maximum number of grants to be processed in one
116 * call to map/unmap grants. Don't choose it too large, as there are arrays
117 * with VSCSI_GRANT_BATCH elements allocated on the stack.
118 */
119 #define VSCSI_GRANT_BATCH 16
120
121 struct vscsibk_pend {
122 uint16_t rqid;
123
124 uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE];
125 uint8_t cmd_len;
126
127 uint8_t sc_data_direction;
128 uint16_t n_sg; /* real length of SG list */
129 uint16_t n_grants; /* SG pages and potentially SG list */
130 uint32_t data_len;
131 uint32_t result;
132
133 struct vscsibk_info *info;
134 struct v2p_entry *v2p;
135 struct scatterlist *sgl;
136
137 uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE];
138
139 grant_handle_t grant_handles[VSCSI_MAX_GRANTS];
140 struct page *pages[VSCSI_MAX_GRANTS];
141
142 struct se_cmd se_cmd;
143 };
144
145 struct scsiback_tmr {
146 atomic_t tmr_complete;
147 wait_queue_head_t tmr_wait;
148 };
149
150 struct scsiback_nexus {
151 /* Pointer to TCM session for I_T Nexus */
152 struct se_session *tvn_se_sess;
153 };
154
155 struct scsiback_tport {
156 /* SCSI protocol the tport is providing */
157 u8 tport_proto_id;
158 /* Binary World Wide unique Port Name for pvscsi Target port */
159 u64 tport_wwpn;
160 /* ASCII formatted WWPN for pvscsi Target port */
161 char tport_name[VSCSI_NAMELEN];
162 /* Returned by scsiback_make_tport() */
163 struct se_wwn tport_wwn;
164 };
165
166 struct scsiback_tpg {
167 /* scsiback port target portal group tag for TCM */
168 u16 tport_tpgt;
169 /* track number of TPG Port/Lun Links wrt explicit I_T Nexus shutdown */
170 int tv_tpg_port_count;
171 /* xen-pvscsi references to tpg_nexus, protected by tv_tpg_mutex */
172 int tv_tpg_fe_count;
173 /* list for scsiback_list */
174 struct list_head tv_tpg_list;
175 /* Used to protect access for tpg_nexus */
176 struct mutex tv_tpg_mutex;
177 /* Pointer to the TCM pvscsi I_T Nexus for this TPG endpoint */
178 struct scsiback_nexus *tpg_nexus;
179 /* Pointer back to scsiback_tport */
180 struct scsiback_tport *tport;
181 /* Returned by scsiback_make_tpg() */
182 struct se_portal_group se_tpg;
183 /* alias used in xenstore */
184 char param_alias[VSCSI_NAMELEN];
185 /* list of info structures related to this target portal group */
186 struct list_head info_list;
187 };
188
189 #define SCSIBACK_INVALID_HANDLE (~0)
190
191 static bool log_print_stat;
192 module_param(log_print_stat, bool, 0644);
193
194 static int scsiback_max_buffer_pages = 1024;
195 module_param_named(max_buffer_pages, scsiback_max_buffer_pages, int, 0644);
196 MODULE_PARM_DESC(max_buffer_pages,
197 "Maximum number of free pages to keep in backend buffer");
198
199 static struct kmem_cache *scsiback_cachep;
200 static DEFINE_SPINLOCK(free_pages_lock);
201 static int free_pages_num;
202 static LIST_HEAD(scsiback_free_pages);
203
204 /* Global spinlock to protect scsiback TPG list */
205 static DEFINE_MUTEX(scsiback_mutex);
206 static LIST_HEAD(scsiback_list);
207
208 /* Local pointer to allocated TCM configfs fabric module */
209 static struct target_fabric_configfs *scsiback_fabric_configfs;
210
211 static void scsiback_get(struct vscsibk_info *info)
212 {
213 atomic_inc(&info->nr_unreplied_reqs);
214 }
215
216 static void scsiback_put(struct vscsibk_info *info)
217 {
218 if (atomic_dec_and_test(&info->nr_unreplied_reqs))
219 wake_up(&info->waiting_to_free);
220 }
221
222 static void put_free_pages(struct page **page, int num)
223 {
224 unsigned long flags;
225 int i = free_pages_num + num, n = num;
226
227 if (num == 0)
228 return;
229 if (i > scsiback_max_buffer_pages) {
230 n = min(num, i - scsiback_max_buffer_pages);
231 gnttab_free_pages(n, page + num - n);
232 n = num - n;
233 }
234 spin_lock_irqsave(&free_pages_lock, flags);
235 for (i = 0; i < n; i++)
236 list_add(&page[i]->lru, &scsiback_free_pages);
237 free_pages_num += n;
238 spin_unlock_irqrestore(&free_pages_lock, flags);
239 }
240
241 static int get_free_page(struct page **page)
242 {
243 unsigned long flags;
244
245 spin_lock_irqsave(&free_pages_lock, flags);
246 if (list_empty(&scsiback_free_pages)) {
247 spin_unlock_irqrestore(&free_pages_lock, flags);
248 return gnttab_alloc_pages(1, page);
249 }
250 page[0] = list_first_entry(&scsiback_free_pages, struct page, lru);
251 list_del(&page[0]->lru);
252 free_pages_num--;
253 spin_unlock_irqrestore(&free_pages_lock, flags);
254 return 0;
255 }
256
257 static unsigned long vaddr_page(struct page *page)
258 {
259 unsigned long pfn = page_to_pfn(page);
260
261 return (unsigned long)pfn_to_kaddr(pfn);
262 }
263
264 static unsigned long vaddr(struct vscsibk_pend *req, int seg)
265 {
266 return vaddr_page(req->pages[seg]);
267 }
268
269 static void scsiback_print_status(char *sense_buffer, int errors,
270 struct vscsibk_pend *pending_req)
271 {
272 struct scsiback_tpg *tpg = pending_req->v2p->tpg;
273
274 pr_err("xen-pvscsi[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n",
275 tpg->tport->tport_name, pending_req->v2p->lun,
276 pending_req->cmnd[0], status_byte(errors), msg_byte(errors),
277 host_byte(errors), driver_byte(errors));
278 }
279
280 static void scsiback_fast_flush_area(struct vscsibk_pend *req)
281 {
282 struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH];
283 struct page *pages[VSCSI_GRANT_BATCH];
284 unsigned int i, invcount = 0;
285 grant_handle_t handle;
286 int err;
287
288 kfree(req->sgl);
289 req->sgl = NULL;
290 req->n_sg = 0;
291
292 if (!req->n_grants)
293 return;
294
295 for (i = 0; i < req->n_grants; i++) {
296 handle = req->grant_handles[i];
297 if (handle == SCSIBACK_INVALID_HANDLE)
298 continue;
299 gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i),
300 GNTMAP_host_map, handle);
301 req->grant_handles[i] = SCSIBACK_INVALID_HANDLE;
302 pages[invcount] = req->pages[i];
303 put_page(pages[invcount]);
304 invcount++;
305 if (invcount < VSCSI_GRANT_BATCH)
306 continue;
307 err = gnttab_unmap_refs(unmap, NULL, pages, invcount);
308 BUG_ON(err);
309 invcount = 0;
310 }
311
312 if (invcount) {
313 err = gnttab_unmap_refs(unmap, NULL, pages, invcount);
314 BUG_ON(err);
315 }
316
317 put_free_pages(req->pages, req->n_grants);
318 req->n_grants = 0;
319 }
320
321 static void scsiback_free_translation_entry(struct kref *kref)
322 {
323 struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref);
324 struct scsiback_tpg *tpg = entry->tpg;
325
326 mutex_lock(&tpg->tv_tpg_mutex);
327 tpg->tv_tpg_fe_count--;
328 mutex_unlock(&tpg->tv_tpg_mutex);
329
330 kfree(entry);
331 }
332
333 static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result,
334 uint32_t resid, struct vscsibk_pend *pending_req)
335 {
336 struct vscsiif_response *ring_res;
337 struct vscsibk_info *info = pending_req->info;
338 int notify;
339 struct scsi_sense_hdr sshdr;
340 unsigned long flags;
341 unsigned len;
342
343 spin_lock_irqsave(&info->ring_lock, flags);
344
345 ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt);
346 info->ring.rsp_prod_pvt++;
347
348 ring_res->rslt = result;
349 ring_res->rqid = pending_req->rqid;
350
351 if (sense_buffer != NULL &&
352 scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE,
353 &sshdr)) {
354 len = min_t(unsigned, 8 + sense_buffer[7],
355 VSCSIIF_SENSE_BUFFERSIZE);
356 memcpy(ring_res->sense_buffer, sense_buffer, len);
357 ring_res->sense_len = len;
358 } else {
359 ring_res->sense_len = 0;
360 }
361
362 ring_res->residual_len = resid;
363
364 RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify);
365 spin_unlock_irqrestore(&info->ring_lock, flags);
366
367 if (notify)
368 notify_remote_via_irq(info->irq);
369
370 if (pending_req->v2p)
371 kref_put(&pending_req->v2p->kref,
372 scsiback_free_translation_entry);
373 }
374
375 static void scsiback_cmd_done(struct vscsibk_pend *pending_req)
376 {
377 struct vscsibk_info *info = pending_req->info;
378 unsigned char *sense_buffer;
379 unsigned int resid;
380 int errors;
381
382 sense_buffer = pending_req->sense_buffer;
383 resid = pending_req->se_cmd.residual_count;
384 errors = pending_req->result;
385
386 if (errors && log_print_stat)
387 scsiback_print_status(sense_buffer, errors, pending_req);
388
389 scsiback_fast_flush_area(pending_req);
390 scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req);
391 scsiback_put(info);
392 }
393
394 static void scsiback_cmd_exec(struct vscsibk_pend *pending_req)
395 {
396 struct se_cmd *se_cmd = &pending_req->se_cmd;
397 struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess;
398 int rc;
399
400 memset(pending_req->sense_buffer, 0, VSCSIIF_SENSE_BUFFERSIZE);
401
402 memset(se_cmd, 0, sizeof(*se_cmd));
403
404 scsiback_get(pending_req->info);
405 rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd,
406 pending_req->sense_buffer, pending_req->v2p->lun,
407 pending_req->data_len, 0,
408 pending_req->sc_data_direction, 0,
409 pending_req->sgl, pending_req->n_sg,
410 NULL, 0, NULL, 0);
411 if (rc < 0) {
412 transport_send_check_condition_and_sense(se_cmd,
413 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
414 transport_generic_free_cmd(se_cmd, 0);
415 }
416 }
417
418 static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map,
419 struct page **pg, grant_handle_t *grant, int cnt)
420 {
421 int err, i;
422
423 if (!cnt)
424 return 0;
425
426 err = gnttab_map_refs(map, NULL, pg, cnt);
427 BUG_ON(err);
428 for (i = 0; i < cnt; i++) {
429 if (unlikely(map[i].status != GNTST_okay)) {
430 pr_err("xen-pvscsi: invalid buffer -- could not remap it\n");
431 map[i].handle = SCSIBACK_INVALID_HANDLE;
432 err = -ENOMEM;
433 } else {
434 get_page(pg[i]);
435 }
436 grant[i] = map[i].handle;
437 }
438 return err;
439 }
440
441 static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req,
442 struct scsiif_request_segment *seg, struct page **pg,
443 grant_handle_t *grant, int cnt, u32 flags)
444 {
445 int mapcount = 0, i, err = 0;
446 struct gnttab_map_grant_ref map[VSCSI_GRANT_BATCH];
447 struct vscsibk_info *info = pending_req->info;
448
449 for (i = 0; i < cnt; i++) {
450 if (get_free_page(pg + mapcount)) {
451 put_free_pages(pg, mapcount);
452 pr_err("xen-pvscsi: no grant page\n");
453 return -ENOMEM;
454 }
455 gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]),
456 flags, seg[i].gref, info->domid);
457 mapcount++;
458 if (mapcount < VSCSI_GRANT_BATCH)
459 continue;
460 err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount);
461 pg += mapcount;
462 grant += mapcount;
463 pending_req->n_grants += mapcount;
464 if (err)
465 return err;
466 mapcount = 0;
467 }
468 err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount);
469 pending_req->n_grants += mapcount;
470 return err;
471 }
472
473 static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req,
474 struct vscsibk_pend *pending_req)
475 {
476 u32 flags;
477 int i, err, n_segs, i_seg = 0;
478 struct page **pg;
479 struct scsiif_request_segment *seg;
480 unsigned long end_seg = 0;
481 unsigned int nr_segments = (unsigned int)ring_req->nr_segments;
482 unsigned int nr_sgl = 0;
483 struct scatterlist *sg;
484 grant_handle_t *grant;
485
486 pending_req->n_sg = 0;
487 pending_req->n_grants = 0;
488 pending_req->data_len = 0;
489
490 nr_segments &= ~VSCSIIF_SG_GRANT;
491 if (!nr_segments)
492 return 0;
493
494 if (nr_segments > VSCSIIF_SG_TABLESIZE) {
495 DPRINTK("xen-pvscsi: invalid parameter nr_seg = %d\n",
496 ring_req->nr_segments);
497 return -EINVAL;
498 }
499
500 if (ring_req->nr_segments & VSCSIIF_SG_GRANT) {
501 err = scsiback_gnttab_data_map_list(pending_req, ring_req->seg,
502 pending_req->pages, pending_req->grant_handles,
503 nr_segments, GNTMAP_host_map | GNTMAP_readonly);
504 if (err)
505 return err;
506 nr_sgl = nr_segments;
507 nr_segments = 0;
508 for (i = 0; i < nr_sgl; i++) {
509 n_segs = ring_req->seg[i].length /
510 sizeof(struct scsiif_request_segment);
511 if ((unsigned)ring_req->seg[i].offset +
512 (unsigned)ring_req->seg[i].length > PAGE_SIZE ||
513 n_segs * sizeof(struct scsiif_request_segment) !=
514 ring_req->seg[i].length)
515 return -EINVAL;
516 nr_segments += n_segs;
517 }
518 if (nr_segments > SG_ALL) {
519 DPRINTK("xen-pvscsi: invalid nr_seg = %d\n",
520 nr_segments);
521 return -EINVAL;
522 }
523 }
524
525 /* free of (sgl) in fast_flush_area()*/
526 pending_req->sgl = kmalloc_array(nr_segments,
527 sizeof(struct scatterlist), GFP_KERNEL);
528 if (!pending_req->sgl)
529 return -ENOMEM;
530
531 sg_init_table(pending_req->sgl, nr_segments);
532 pending_req->n_sg = nr_segments;
533
534 flags = GNTMAP_host_map;
535 if (pending_req->sc_data_direction == DMA_TO_DEVICE)
536 flags |= GNTMAP_readonly;
537
538 pg = pending_req->pages + nr_sgl;
539 grant = pending_req->grant_handles + nr_sgl;
540 if (!nr_sgl) {
541 seg = ring_req->seg;
542 err = scsiback_gnttab_data_map_list(pending_req, seg,
543 pg, grant, nr_segments, flags);
544 if (err)
545 return err;
546 } else {
547 for (i = 0; i < nr_sgl; i++) {
548 seg = (struct scsiif_request_segment *)(
549 vaddr(pending_req, i) + ring_req->seg[i].offset);
550 n_segs = ring_req->seg[i].length /
551 sizeof(struct scsiif_request_segment);
552 err = scsiback_gnttab_data_map_list(pending_req, seg,
553 pg, grant, n_segs, flags);
554 if (err)
555 return err;
556 pg += n_segs;
557 grant += n_segs;
558 }
559 end_seg = vaddr(pending_req, 0) + ring_req->seg[0].offset;
560 seg = (struct scsiif_request_segment *)end_seg;
561 end_seg += ring_req->seg[0].length;
562 pg = pending_req->pages + nr_sgl;
563 }
564
565 for_each_sg(pending_req->sgl, sg, nr_segments, i) {
566 sg_set_page(sg, pg[i], seg->length, seg->offset);
567 pending_req->data_len += seg->length;
568 seg++;
569 if (nr_sgl && (unsigned long)seg >= end_seg) {
570 i_seg++;
571 end_seg = vaddr(pending_req, i_seg) +
572 ring_req->seg[i_seg].offset;
573 seg = (struct scsiif_request_segment *)end_seg;
574 end_seg += ring_req->seg[i_seg].length;
575 }
576 if (sg->offset >= PAGE_SIZE ||
577 sg->length > PAGE_SIZE ||
578 sg->offset + sg->length > PAGE_SIZE)
579 return -EINVAL;
580 }
581
582 return 0;
583 }
584
585 static void scsiback_disconnect(struct vscsibk_info *info)
586 {
587 wait_event(info->waiting_to_free,
588 atomic_read(&info->nr_unreplied_reqs) == 0);
589
590 unbind_from_irqhandler(info->irq, info);
591 info->irq = 0;
592 xenbus_unmap_ring_vfree(info->dev, info->ring.sring);
593 }
594
595 static void scsiback_device_action(struct vscsibk_pend *pending_req,
596 enum tcm_tmreq_table act, int tag)
597 {
598 int rc, err = FAILED;
599 struct scsiback_tpg *tpg = pending_req->v2p->tpg;
600 struct se_cmd *se_cmd = &pending_req->se_cmd;
601 struct scsiback_tmr *tmr;
602
603 tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL);
604 if (!tmr)
605 goto out;
606
607 init_waitqueue_head(&tmr->tmr_wait);
608
609 transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo,
610 tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, TCM_SIMPLE_TAG,
611 &pending_req->sense_buffer[0]);
612
613 rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL);
614 if (rc < 0)
615 goto out;
616
617 se_cmd->se_tmr_req->ref_task_tag = tag;
618
619 if (transport_lookup_tmr_lun(se_cmd, pending_req->v2p->lun) < 0)
620 goto out;
621
622 transport_generic_handle_tmr(se_cmd);
623 wait_event(tmr->tmr_wait, atomic_read(&tmr->tmr_complete));
624
625 err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
626 SUCCESS : FAILED;
627
628 out:
629 if (tmr) {
630 transport_generic_free_cmd(&pending_req->se_cmd, 1);
631 kfree(tmr);
632 }
633
634 scsiback_do_resp_with_sense(NULL, err, 0, pending_req);
635
636 kmem_cache_free(scsiback_cachep, pending_req);
637 }
638
639 /*
640 Perform virtual to physical translation
641 */
642 static struct v2p_entry *scsiback_do_translation(struct vscsibk_info *info,
643 struct ids_tuple *v)
644 {
645 struct v2p_entry *entry;
646 struct list_head *head = &(info->v2p_entry_lists);
647 unsigned long flags;
648
649 spin_lock_irqsave(&info->v2p_lock, flags);
650 list_for_each_entry(entry, head, l) {
651 if ((entry->v.chn == v->chn) &&
652 (entry->v.tgt == v->tgt) &&
653 (entry->v.lun == v->lun)) {
654 kref_get(&entry->kref);
655 goto out;
656 }
657 }
658 entry = NULL;
659
660 out:
661 spin_unlock_irqrestore(&info->v2p_lock, flags);
662 return entry;
663 }
664
665 static int prepare_pending_reqs(struct vscsibk_info *info,
666 struct vscsiif_request *ring_req,
667 struct vscsibk_pend *pending_req)
668 {
669 struct v2p_entry *v2p;
670 struct ids_tuple vir;
671
672 pending_req->rqid = ring_req->rqid;
673 pending_req->info = info;
674
675 vir.chn = ring_req->channel;
676 vir.tgt = ring_req->id;
677 vir.lun = ring_req->lun;
678
679 v2p = scsiback_do_translation(info, &vir);
680 if (!v2p) {
681 pending_req->v2p = NULL;
682 DPRINTK("xen-pvscsi: doesn't exist.\n");
683 return -ENODEV;
684 }
685 pending_req->v2p = v2p;
686
687 /* request range check from frontend */
688 pending_req->sc_data_direction = ring_req->sc_data_direction;
689 if ((pending_req->sc_data_direction != DMA_BIDIRECTIONAL) &&
690 (pending_req->sc_data_direction != DMA_TO_DEVICE) &&
691 (pending_req->sc_data_direction != DMA_FROM_DEVICE) &&
692 (pending_req->sc_data_direction != DMA_NONE)) {
693 DPRINTK("xen-pvscsi: invalid parameter data_dir = %d\n",
694 pending_req->sc_data_direction);
695 return -EINVAL;
696 }
697
698 pending_req->cmd_len = ring_req->cmd_len;
699 if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) {
700 DPRINTK("xen-pvscsi: invalid parameter cmd_len = %d\n",
701 pending_req->cmd_len);
702 return -EINVAL;
703 }
704 memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len);
705
706 return 0;
707 }
708
709 static int scsiback_do_cmd_fn(struct vscsibk_info *info)
710 {
711 struct vscsiif_back_ring *ring = &info->ring;
712 struct vscsiif_request *ring_req;
713 struct vscsibk_pend *pending_req;
714 RING_IDX rc, rp;
715 int err, more_to_do;
716 uint32_t result;
717 uint8_t act;
718
719 rc = ring->req_cons;
720 rp = ring->sring->req_prod;
721 rmb(); /* guest system is accessing ring, too */
722
723 if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) {
724 rc = ring->rsp_prod_pvt;
725 pr_warn("xen-pvscsi: Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n",
726 info->domid, rp, rc, rp - rc);
727 info->ring_error = 1;
728 return 0;
729 }
730
731 while ((rc != rp)) {
732 if (RING_REQUEST_CONS_OVERFLOW(ring, rc))
733 break;
734 pending_req = kmem_cache_alloc(scsiback_cachep, GFP_KERNEL);
735 if (!pending_req)
736 return 1;
737
738 ring_req = RING_GET_REQUEST(ring, rc);
739 ring->req_cons = ++rc;
740
741 act = ring_req->act;
742 err = prepare_pending_reqs(info, ring_req, pending_req);
743 if (err) {
744 switch (err) {
745 case -ENODEV:
746 result = DID_NO_CONNECT;
747 break;
748 default:
749 result = DRIVER_ERROR;
750 break;
751 }
752 scsiback_do_resp_with_sense(NULL, result << 24, 0,
753 pending_req);
754 kmem_cache_free(scsiback_cachep, pending_req);
755 return 1;
756 }
757
758 switch (act) {
759 case VSCSIIF_ACT_SCSI_CDB:
760 if (scsiback_gnttab_data_map(ring_req, pending_req)) {
761 scsiback_fast_flush_area(pending_req);
762 scsiback_do_resp_with_sense(NULL,
763 DRIVER_ERROR << 24, 0, pending_req);
764 kmem_cache_free(scsiback_cachep, pending_req);
765 } else {
766 scsiback_cmd_exec(pending_req);
767 }
768 break;
769 case VSCSIIF_ACT_SCSI_ABORT:
770 scsiback_device_action(pending_req, TMR_ABORT_TASK,
771 ring_req->ref_rqid);
772 break;
773 case VSCSIIF_ACT_SCSI_RESET:
774 scsiback_device_action(pending_req, TMR_LUN_RESET, 0);
775 break;
776 default:
777 pr_err_ratelimited("xen-pvscsi: invalid request\n");
778 scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24,
779 0, pending_req);
780 kmem_cache_free(scsiback_cachep, pending_req);
781 break;
782 }
783
784 /* Yield point for this unbounded loop. */
785 cond_resched();
786 }
787
788 RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do);
789 return more_to_do;
790 }
791
792 static irqreturn_t scsiback_irq_fn(int irq, void *dev_id)
793 {
794 struct vscsibk_info *info = dev_id;
795
796 if (info->ring_error)
797 return IRQ_HANDLED;
798
799 while (scsiback_do_cmd_fn(info))
800 cond_resched();
801
802 return IRQ_HANDLED;
803 }
804
805 static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref,
806 evtchn_port_t evtchn)
807 {
808 void *area;
809 struct vscsiif_sring *sring;
810 int err;
811
812 if (info->irq)
813 return -1;
814
815 err = xenbus_map_ring_valloc(info->dev, ring_ref, &area);
816 if (err)
817 return err;
818
819 sring = (struct vscsiif_sring *)area;
820 BACK_RING_INIT(&info->ring, sring, PAGE_SIZE);
821
822 err = bind_interdomain_evtchn_to_irq(info->domid, evtchn);
823 if (err < 0)
824 goto unmap_page;
825
826 info->irq = err;
827
828 err = request_threaded_irq(info->irq, NULL, scsiback_irq_fn,
829 IRQF_ONESHOT, "vscsiif-backend", info);
830 if (err)
831 goto free_irq;
832
833 return 0;
834
835 free_irq:
836 unbind_from_irqhandler(info->irq, info);
837 info->irq = 0;
838 unmap_page:
839 xenbus_unmap_ring_vfree(info->dev, area);
840
841 return err;
842 }
843
844 static int scsiback_map(struct vscsibk_info *info)
845 {
846 struct xenbus_device *dev = info->dev;
847 unsigned int ring_ref, evtchn;
848 int err;
849
850 err = xenbus_gather(XBT_NIL, dev->otherend,
851 "ring-ref", "%u", &ring_ref,
852 "event-channel", "%u", &evtchn, NULL);
853 if (err) {
854 xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend);
855 return err;
856 }
857
858 return scsiback_init_sring(info, ring_ref, evtchn);
859 }
860
861 /*
862 Add a new translation entry
863 */
864 static int scsiback_add_translation_entry(struct vscsibk_info *info,
865 char *phy, struct ids_tuple *v)
866 {
867 int err = 0;
868 struct v2p_entry *entry;
869 struct v2p_entry *new;
870 struct list_head *head = &(info->v2p_entry_lists);
871 unsigned long flags;
872 char *lunp;
873 unsigned int lun;
874 struct scsiback_tpg *tpg_entry, *tpg = NULL;
875 char *error = "doesn't exist";
876
877 lunp = strrchr(phy, ':');
878 if (!lunp) {
879 pr_err("xen-pvscsi: illegal format of physical device %s\n",
880 phy);
881 return -EINVAL;
882 }
883 *lunp = 0;
884 lunp++;
885 if (kstrtouint(lunp, 10, &lun) || lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
886 pr_err("xen-pvscsi: lun number not valid: %s\n", lunp);
887 return -EINVAL;
888 }
889
890 mutex_lock(&scsiback_mutex);
891 list_for_each_entry(tpg_entry, &scsiback_list, tv_tpg_list) {
892 if (!strcmp(phy, tpg_entry->tport->tport_name) ||
893 !strcmp(phy, tpg_entry->param_alias)) {
894 spin_lock(&tpg_entry->se_tpg.tpg_lun_lock);
895 if (tpg_entry->se_tpg.tpg_lun_list[lun]->lun_status ==
896 TRANSPORT_LUN_STATUS_ACTIVE) {
897 if (!tpg_entry->tpg_nexus)
898 error = "nexus undefined";
899 else
900 tpg = tpg_entry;
901 }
902 spin_unlock(&tpg_entry->se_tpg.tpg_lun_lock);
903 break;
904 }
905 }
906 if (tpg) {
907 mutex_lock(&tpg->tv_tpg_mutex);
908 tpg->tv_tpg_fe_count++;
909 mutex_unlock(&tpg->tv_tpg_mutex);
910 }
911 mutex_unlock(&scsiback_mutex);
912
913 if (!tpg) {
914 pr_err("xen-pvscsi: %s:%d %s\n", phy, lun, error);
915 return -ENODEV;
916 }
917
918 new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL);
919 if (new == NULL) {
920 err = -ENOMEM;
921 goto out_free;
922 }
923
924 spin_lock_irqsave(&info->v2p_lock, flags);
925
926 /* Check double assignment to identical virtual ID */
927 list_for_each_entry(entry, head, l) {
928 if ((entry->v.chn == v->chn) &&
929 (entry->v.tgt == v->tgt) &&
930 (entry->v.lun == v->lun)) {
931 pr_warn("xen-pvscsi: Virtual ID is already used. Assignment was not performed.\n");
932 err = -EEXIST;
933 goto out;
934 }
935
936 }
937
938 /* Create a new translation entry and add to the list */
939 kref_init(&new->kref);
940 new->v = *v;
941 new->tpg = tpg;
942 new->lun = lun;
943 list_add_tail(&new->l, head);
944
945 out:
946 spin_unlock_irqrestore(&info->v2p_lock, flags);
947
948 out_free:
949 mutex_lock(&tpg->tv_tpg_mutex);
950 tpg->tv_tpg_fe_count--;
951 mutex_unlock(&tpg->tv_tpg_mutex);
952
953 if (err)
954 kfree(new);
955
956 return err;
957 }
958
959 static void __scsiback_del_translation_entry(struct v2p_entry *entry)
960 {
961 list_del(&entry->l);
962 kref_put(&entry->kref, scsiback_free_translation_entry);
963 }
964
965 /*
966 Delete the translation entry specfied
967 */
968 static int scsiback_del_translation_entry(struct vscsibk_info *info,
969 struct ids_tuple *v)
970 {
971 struct v2p_entry *entry;
972 struct list_head *head = &(info->v2p_entry_lists);
973 unsigned long flags;
974
975 spin_lock_irqsave(&info->v2p_lock, flags);
976 /* Find out the translation entry specified */
977 list_for_each_entry(entry, head, l) {
978 if ((entry->v.chn == v->chn) &&
979 (entry->v.tgt == v->tgt) &&
980 (entry->v.lun == v->lun)) {
981 goto found;
982 }
983 }
984
985 spin_unlock_irqrestore(&info->v2p_lock, flags);
986 return 1;
987
988 found:
989 /* Delete the translation entry specfied */
990 __scsiback_del_translation_entry(entry);
991
992 spin_unlock_irqrestore(&info->v2p_lock, flags);
993 return 0;
994 }
995
996 static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
997 char *phy, struct ids_tuple *vir)
998 {
999 if (!scsiback_add_translation_entry(info, phy, vir)) {
1000 if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
1001 "%d", XenbusStateInitialised)) {
1002 pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
1003 scsiback_del_translation_entry(info, vir);
1004 }
1005 } else {
1006 xenbus_printf(XBT_NIL, info->dev->nodename, state,
1007 "%d", XenbusStateClosed);
1008 }
1009 }
1010
1011 static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state,
1012 struct ids_tuple *vir)
1013 {
1014 if (!scsiback_del_translation_entry(info, vir)) {
1015 if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
1016 "%d", XenbusStateClosed))
1017 pr_err("xen-pvscsi: xenbus_printf error %s\n", state);
1018 }
1019 }
1020
1021 #define VSCSIBACK_OP_ADD_OR_DEL_LUN 1
1022 #define VSCSIBACK_OP_UPDATEDEV_STATE 2
1023
1024 static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op,
1025 char *ent)
1026 {
1027 int err;
1028 struct ids_tuple vir;
1029 char *val;
1030 int device_state;
1031 char phy[VSCSI_NAMELEN];
1032 char str[64];
1033 char state[64];
1034 struct xenbus_device *dev = info->dev;
1035
1036 /* read status */
1037 snprintf(state, sizeof(state), "vscsi-devs/%s/state", ent);
1038 err = xenbus_scanf(XBT_NIL, dev->nodename, state, "%u", &device_state);
1039 if (XENBUS_EXIST_ERR(err))
1040 return;
1041
1042 /* physical SCSI device */
1043 snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent);
1044 val = xenbus_read(XBT_NIL, dev->nodename, str, NULL);
1045 if (IS_ERR(val)) {
1046 xenbus_printf(XBT_NIL, dev->nodename, state,
1047 "%d", XenbusStateClosed);
1048 return;
1049 }
1050 strlcpy(phy, val, VSCSI_NAMELEN);
1051 kfree(val);
1052
1053 /* virtual SCSI device */
1054 snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", ent);
1055 err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u",
1056 &vir.hst, &vir.chn, &vir.tgt, &vir.lun);
1057 if (XENBUS_EXIST_ERR(err)) {
1058 xenbus_printf(XBT_NIL, dev->nodename, state,
1059 "%d", XenbusStateClosed);
1060 return;
1061 }
1062
1063 switch (op) {
1064 case VSCSIBACK_OP_ADD_OR_DEL_LUN:
1065 if (device_state == XenbusStateInitialising)
1066 scsiback_do_add_lun(info, state, phy, &vir);
1067 if (device_state == XenbusStateClosing)
1068 scsiback_do_del_lun(info, state, &vir);
1069 break;
1070
1071 case VSCSIBACK_OP_UPDATEDEV_STATE:
1072 if (device_state == XenbusStateInitialised) {
1073 /* modify vscsi-devs/dev-x/state */
1074 if (xenbus_printf(XBT_NIL, dev->nodename, state,
1075 "%d", XenbusStateConnected)) {
1076 pr_err("xen-pvscsi: xenbus_printf error %s\n",
1077 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 DPRINTK("%p %d\n", 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("xen-pvscsi: %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("xen-pvscsi: 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("xen-pvscsi: 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
1476 * pointer. 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 /*
1665 * Now register the TCM pvscsi virtual I_T Nexus as active with the
1666 * call to __transport_register_session()
1667 */
1668 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
1669 tv_nexus->tvn_se_sess, tv_nexus);
1670 tpg->tpg_nexus = tv_nexus;
1671
1672 mutex_unlock(&tpg->tv_tpg_mutex);
1673 return 0;
1674
1675 out:
1676 transport_free_session(se_sess);
1677 kfree(tv_nexus);
1678 return -ENOMEM;
1679 }
1680
1681 static int scsiback_drop_nexus(struct scsiback_tpg *tpg)
1682 {
1683 struct se_session *se_sess;
1684 struct scsiback_nexus *tv_nexus;
1685
1686 mutex_lock(&tpg->tv_tpg_mutex);
1687 tv_nexus = tpg->tpg_nexus;
1688 if (!tv_nexus) {
1689 mutex_unlock(&tpg->tv_tpg_mutex);
1690 return -ENODEV;
1691 }
1692
1693 se_sess = tv_nexus->tvn_se_sess;
1694 if (!se_sess) {
1695 mutex_unlock(&tpg->tv_tpg_mutex);
1696 return -ENODEV;
1697 }
1698
1699 if (tpg->tv_tpg_port_count != 0) {
1700 mutex_unlock(&tpg->tv_tpg_mutex);
1701 pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG port count: %d\n",
1702 tpg->tv_tpg_port_count);
1703 return -EBUSY;
1704 }
1705
1706 if (tpg->tv_tpg_fe_count != 0) {
1707 mutex_unlock(&tpg->tv_tpg_mutex);
1708 pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG frontend count: %d\n",
1709 tpg->tv_tpg_fe_count);
1710 return -EBUSY;
1711 }
1712
1713 pr_debug("xen-pvscsi: Removing I_T Nexus to emulated %s Initiator Port: %s\n",
1714 scsiback_dump_proto_id(tpg->tport),
1715 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1716
1717 /*
1718 * Release the SCSI I_T Nexus to the emulated xen-pvscsi Target Port
1719 */
1720 transport_deregister_session(tv_nexus->tvn_se_sess);
1721 tpg->tpg_nexus = NULL;
1722 mutex_unlock(&tpg->tv_tpg_mutex);
1723
1724 kfree(tv_nexus);
1725 return 0;
1726 }
1727
1728 static ssize_t scsiback_tpg_show_nexus(struct se_portal_group *se_tpg,
1729 char *page)
1730 {
1731 struct scsiback_tpg *tpg = container_of(se_tpg,
1732 struct scsiback_tpg, se_tpg);
1733 struct scsiback_nexus *tv_nexus;
1734 ssize_t ret;
1735
1736 mutex_lock(&tpg->tv_tpg_mutex);
1737 tv_nexus = tpg->tpg_nexus;
1738 if (!tv_nexus) {
1739 mutex_unlock(&tpg->tv_tpg_mutex);
1740 return -ENODEV;
1741 }
1742 ret = snprintf(page, PAGE_SIZE, "%s\n",
1743 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1744 mutex_unlock(&tpg->tv_tpg_mutex);
1745
1746 return ret;
1747 }
1748
1749 static ssize_t scsiback_tpg_store_nexus(struct se_portal_group *se_tpg,
1750 const char *page,
1751 size_t count)
1752 {
1753 struct scsiback_tpg *tpg = container_of(se_tpg,
1754 struct scsiback_tpg, se_tpg);
1755 struct scsiback_tport *tport_wwn = tpg->tport;
1756 unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr;
1757 int ret;
1758 /*
1759 * Shutdown the active I_T nexus if 'NULL' is passed..
1760 */
1761 if (!strncmp(page, "NULL", 4)) {
1762 ret = scsiback_drop_nexus(tpg);
1763 return (!ret) ? count : ret;
1764 }
1765 /*
1766 * Otherwise make sure the passed virtual Initiator port WWN matches
1767 * the fabric protocol_id set in scsiback_make_tport(), and call
1768 * scsiback_make_nexus().
1769 */
1770 if (strlen(page) >= VSCSI_NAMELEN) {
1771 pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
1772 page, VSCSI_NAMELEN);
1773 return -EINVAL;
1774 }
1775 snprintf(&i_port[0], VSCSI_NAMELEN, "%s", page);
1776
1777 ptr = strstr(i_port, "naa.");
1778 if (ptr) {
1779 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1780 pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
1781 i_port, scsiback_dump_proto_id(tport_wwn));
1782 return -EINVAL;
1783 }
1784 port_ptr = &i_port[0];
1785 goto check_newline;
1786 }
1787 ptr = strstr(i_port, "fc.");
1788 if (ptr) {
1789 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1790 pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
1791 i_port, scsiback_dump_proto_id(tport_wwn));
1792 return -EINVAL;
1793 }
1794 port_ptr = &i_port[3]; /* Skip over "fc." */
1795 goto check_newline;
1796 }
1797 ptr = strstr(i_port, "iqn.");
1798 if (ptr) {
1799 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1800 pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
1801 i_port, scsiback_dump_proto_id(tport_wwn));
1802 return -EINVAL;
1803 }
1804 port_ptr = &i_port[0];
1805 goto check_newline;
1806 }
1807 pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
1808 i_port);
1809 return -EINVAL;
1810 /*
1811 * Clear any trailing newline for the NAA WWN
1812 */
1813 check_newline:
1814 if (i_port[strlen(i_port) - 1] == '\n')
1815 i_port[strlen(i_port) - 1] = '\0';
1816
1817 ret = scsiback_make_nexus(tpg, port_ptr);
1818 if (ret < 0)
1819 return ret;
1820
1821 return count;
1822 }
1823
1824 TF_TPG_BASE_ATTR(scsiback, nexus, S_IRUGO | S_IWUSR);
1825
1826 static struct configfs_attribute *scsiback_tpg_attrs[] = {
1827 &scsiback_tpg_nexus.attr,
1828 NULL,
1829 };
1830
1831 static ssize_t
1832 scsiback_wwn_show_attr_version(struct target_fabric_configfs *tf,
1833 char *page)
1834 {
1835 return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on "
1836 UTS_RELEASE"\n",
1837 VSCSI_VERSION, utsname()->sysname, utsname()->machine);
1838 }
1839
1840 TF_WWN_ATTR_RO(scsiback, version);
1841
1842 static struct configfs_attribute *scsiback_wwn_attrs[] = {
1843 &scsiback_wwn_version.attr,
1844 NULL,
1845 };
1846
1847 static char *scsiback_get_fabric_name(void)
1848 {
1849 return "xen-pvscsi";
1850 }
1851
1852 static int scsiback_port_link(struct se_portal_group *se_tpg,
1853 struct se_lun *lun)
1854 {
1855 struct scsiback_tpg *tpg = container_of(se_tpg,
1856 struct scsiback_tpg, se_tpg);
1857
1858 mutex_lock(&tpg->tv_tpg_mutex);
1859 tpg->tv_tpg_port_count++;
1860 mutex_unlock(&tpg->tv_tpg_mutex);
1861
1862 return 0;
1863 }
1864
1865 static void scsiback_port_unlink(struct se_portal_group *se_tpg,
1866 struct se_lun *lun)
1867 {
1868 struct scsiback_tpg *tpg = container_of(se_tpg,
1869 struct scsiback_tpg, se_tpg);
1870
1871 mutex_lock(&tpg->tv_tpg_mutex);
1872 tpg->tv_tpg_port_count--;
1873 mutex_unlock(&tpg->tv_tpg_mutex);
1874 }
1875
1876 static struct se_portal_group *
1877 scsiback_make_tpg(struct se_wwn *wwn,
1878 struct config_group *group,
1879 const char *name)
1880 {
1881 struct scsiback_tport *tport = container_of(wwn,
1882 struct scsiback_tport, tport_wwn);
1883
1884 struct scsiback_tpg *tpg;
1885 u16 tpgt;
1886 int ret;
1887
1888 if (strstr(name, "tpgt_") != name)
1889 return ERR_PTR(-EINVAL);
1890 ret = kstrtou16(name + 5, 10, &tpgt);
1891 if (ret)
1892 return ERR_PTR(ret);
1893
1894 tpg = kzalloc(sizeof(struct scsiback_tpg), GFP_KERNEL);
1895 if (!tpg)
1896 return ERR_PTR(-ENOMEM);
1897
1898 mutex_init(&tpg->tv_tpg_mutex);
1899 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1900 INIT_LIST_HEAD(&tpg->info_list);
1901 tpg->tport = tport;
1902 tpg->tport_tpgt = tpgt;
1903
1904 ret = core_tpg_register(&scsiback_fabric_configfs->tf_ops, wwn,
1905 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL);
1906 if (ret < 0) {
1907 kfree(tpg);
1908 return NULL;
1909 }
1910 mutex_lock(&scsiback_mutex);
1911 list_add_tail(&tpg->tv_tpg_list, &scsiback_list);
1912 mutex_unlock(&scsiback_mutex);
1913
1914 return &tpg->se_tpg;
1915 }
1916
1917 static void scsiback_drop_tpg(struct se_portal_group *se_tpg)
1918 {
1919 struct scsiback_tpg *tpg = container_of(se_tpg,
1920 struct scsiback_tpg, se_tpg);
1921
1922 mutex_lock(&scsiback_mutex);
1923 list_del(&tpg->tv_tpg_list);
1924 mutex_unlock(&scsiback_mutex);
1925 /*
1926 * Release the virtual I_T Nexus for this xen-pvscsi TPG
1927 */
1928 scsiback_drop_nexus(tpg);
1929 /*
1930 * Deregister the se_tpg from TCM..
1931 */
1932 core_tpg_deregister(se_tpg);
1933 kfree(tpg);
1934 }
1935
1936 static int scsiback_check_true(struct se_portal_group *se_tpg)
1937 {
1938 return 1;
1939 }
1940
1941 static int scsiback_check_false(struct se_portal_group *se_tpg)
1942 {
1943 return 0;
1944 }
1945
1946 static struct target_core_fabric_ops scsiback_ops = {
1947 .get_fabric_name = scsiback_get_fabric_name,
1948 .get_fabric_proto_ident = scsiback_get_fabric_proto_ident,
1949 .tpg_get_wwn = scsiback_get_fabric_wwn,
1950 .tpg_get_tag = scsiback_get_tag,
1951 .tpg_get_default_depth = scsiback_get_default_depth,
1952 .tpg_get_pr_transport_id = scsiback_get_pr_transport_id,
1953 .tpg_get_pr_transport_id_len = scsiback_get_pr_transport_id_len,
1954 .tpg_parse_pr_out_transport_id = scsiback_parse_pr_out_transport_id,
1955 .tpg_check_demo_mode = scsiback_check_true,
1956 .tpg_check_demo_mode_cache = scsiback_check_true,
1957 .tpg_check_demo_mode_write_protect = scsiback_check_false,
1958 .tpg_check_prod_mode_write_protect = scsiback_check_false,
1959 .tpg_alloc_fabric_acl = scsiback_alloc_fabric_acl,
1960 .tpg_release_fabric_acl = scsiback_release_fabric_acl,
1961 .tpg_get_inst_index = scsiback_tpg_get_inst_index,
1962 .check_stop_free = scsiback_check_stop_free,
1963 .release_cmd = scsiback_release_cmd,
1964 .put_session = NULL,
1965 .shutdown_session = scsiback_shutdown_session,
1966 .close_session = scsiback_close_session,
1967 .sess_get_index = scsiback_sess_get_index,
1968 .sess_get_initiator_sid = NULL,
1969 .write_pending = scsiback_write_pending,
1970 .write_pending_status = scsiback_write_pending_status,
1971 .set_default_node_attributes = scsiback_set_default_node_attrs,
1972 .get_task_tag = scsiback_get_task_tag,
1973 .get_cmd_state = scsiback_get_cmd_state,
1974 .queue_data_in = scsiback_queue_data_in,
1975 .queue_status = scsiback_queue_status,
1976 .queue_tm_rsp = scsiback_queue_tm_rsp,
1977 .aborted_task = scsiback_aborted_task,
1978 /*
1979 * Setup callers for generic logic in target_core_fabric_configfs.c
1980 */
1981 .fabric_make_wwn = scsiback_make_tport,
1982 .fabric_drop_wwn = scsiback_drop_tport,
1983 .fabric_make_tpg = scsiback_make_tpg,
1984 .fabric_drop_tpg = scsiback_drop_tpg,
1985 .fabric_post_link = scsiback_port_link,
1986 .fabric_pre_unlink = scsiback_port_unlink,
1987 .fabric_make_np = NULL,
1988 .fabric_drop_np = NULL,
1989 #if 0
1990 .fabric_make_nodeacl = scsiback_make_nodeacl,
1991 .fabric_drop_nodeacl = scsiback_drop_nodeacl,
1992 #endif
1993 };
1994
1995 static int scsiback_register_configfs(void)
1996 {
1997 struct target_fabric_configfs *fabric;
1998 int ret;
1999
2000 pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n",
2001 VSCSI_VERSION, utsname()->sysname, utsname()->machine);
2002 /*
2003 * Register the top level struct config_item_type with TCM core
2004 */
2005 fabric = target_fabric_configfs_init(THIS_MODULE, "xen-pvscsi");
2006 if (IS_ERR(fabric))
2007 return PTR_ERR(fabric);
2008
2009 /*
2010 * Setup fabric->tf_ops from our local scsiback_ops
2011 */
2012 fabric->tf_ops = scsiback_ops;
2013 /*
2014 * Setup default attribute lists for various fabric->tf_cit_tmpl
2015 */
2016 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = scsiback_wwn_attrs;
2017 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = scsiback_tpg_attrs;
2018 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL;
2019 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = scsiback_param_attrs;
2020 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL;
2021 fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL;
2022 fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL;
2023 fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL;
2024 fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL;
2025 /*
2026 * Register the fabric for use within TCM
2027 */
2028 ret = target_fabric_configfs_register(fabric);
2029 if (ret < 0) {
2030 target_fabric_configfs_free(fabric);
2031 return ret;
2032 }
2033 /*
2034 * Setup our local pointer to *fabric
2035 */
2036 scsiback_fabric_configfs = fabric;
2037 pr_debug("xen-pvscsi: Set fabric -> scsiback_fabric_configfs\n");
2038 return 0;
2039 };
2040
2041 static void scsiback_deregister_configfs(void)
2042 {
2043 if (!scsiback_fabric_configfs)
2044 return;
2045
2046 target_fabric_configfs_deregister(scsiback_fabric_configfs);
2047 scsiback_fabric_configfs = NULL;
2048 pr_debug("xen-pvscsi: Cleared scsiback_fabric_configfs\n");
2049 };
2050
2051 static const struct xenbus_device_id scsiback_ids[] = {
2052 { "vscsi" },
2053 { "" }
2054 };
2055
2056 static struct xenbus_driver scsiback_driver = {
2057 .ids = scsiback_ids,
2058 .probe = scsiback_probe,
2059 .remove = scsiback_remove,
2060 .otherend_changed = scsiback_frontend_changed
2061 };
2062
2063 static void scsiback_init_pend(void *p)
2064 {
2065 struct vscsibk_pend *pend = p;
2066 int i;
2067
2068 memset(pend, 0, sizeof(*pend));
2069 for (i = 0; i < VSCSI_MAX_GRANTS; i++)
2070 pend->grant_handles[i] = SCSIBACK_INVALID_HANDLE;
2071 }
2072
2073 static int __init scsiback_init(void)
2074 {
2075 int ret;
2076
2077 if (!xen_domain())
2078 return -ENODEV;
2079
2080 scsiback_cachep = kmem_cache_create("vscsiif_cache",
2081 sizeof(struct vscsibk_pend), 0, 0, scsiback_init_pend);
2082 if (!scsiback_cachep)
2083 return -ENOMEM;
2084
2085 ret = xenbus_register_backend(&scsiback_driver);
2086 if (ret)
2087 goto out_cache_destroy;
2088
2089 ret = scsiback_register_configfs();
2090 if (ret)
2091 goto out_unregister_xenbus;
2092
2093 return 0;
2094
2095 out_unregister_xenbus:
2096 xenbus_unregister_driver(&scsiback_driver);
2097 out_cache_destroy:
2098 kmem_cache_destroy(scsiback_cachep);
2099 pr_err("xen-pvscsi: %s: error %d\n", __func__, ret);
2100 return ret;
2101 }
2102
2103 static void __exit scsiback_exit(void)
2104 {
2105 struct page *page;
2106
2107 while (free_pages_num) {
2108 if (get_free_page(&page))
2109 BUG();
2110 gnttab_free_pages(1, &page);
2111 }
2112 scsiback_deregister_configfs();
2113 xenbus_unregister_driver(&scsiback_driver);
2114 kmem_cache_destroy(scsiback_cachep);
2115 }
2116
2117 module_init(scsiback_init);
2118 module_exit(scsiback_exit);
2119
2120 MODULE_DESCRIPTION("Xen SCSI backend driver");
2121 MODULE_LICENSE("Dual BSD/GPL");
2122 MODULE_ALIAS("xen-backend:vscsi");
2123 MODULE_AUTHOR("Juergen Gross <jgross@suse.com>");
Linux kernel - Deliverables
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