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target/pr: cleanup core_scsi3_pr_seq_non_holder
[mirror_ubuntu-zesty-kernel.git] / drivers / xen / xen-scsiback.c
CommitLineData
d9d660f6
JG		 1/*
2 * Xen SCSI backend driver
3 *
4 * Copyright (c) 2008, FUJITSU Limited
5 *
6 * Based on the blkback driver code.
7 * Adaption to kernel taget core infrastructure taken from vhost/scsi.c
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation; or, when distributed
12 * separately from the Linux kernel or incorporated into other
13 * software packages, subject to the following license:
14 *
15 * Permission is hereby granted, free of charge, to any person obtaining a copy
16 * of this source file (the "Software"), to deal in the Software without
17 * restriction, including without limitation the rights to use, copy, modify,
18 * merge, publish, distribute, sublicense, and/or sell copies of the Software,
19 * and to permit persons to whom the Software is furnished to do so, subject to
20 * the following conditions:
21 *
22 * The above copyright notice and this permission notice shall be included in
23 * all copies or substantial portions of the Software.
24 *
25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
28 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
29 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
30 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
31 * IN THE SOFTWARE.
32 */
33
78574878
TC		 34#define pr_fmt(fmt) "xen-pvscsi: " fmt
35
d9d660f6
JG		 36#include <stdarg.h>
37
38#include <linux/module.h>
39#include <linux/utsname.h>
40#include <linux/interrupt.h>
41#include <linux/slab.h>
42#include <linux/wait.h>
43#include <linux/sched.h>
44#include <linux/list.h>
45#include <linux/gfp.h>
46#include <linux/delay.h>
47#include <linux/spinlock.h>
48#include <linux/configfs.h>
49
50#include <generated/utsrelease.h>
51
2dd951ec 52#include <scsi/scsi.h>
d9d660f6
JG		 53#include <scsi/scsi_dbg.h>
54#include <scsi/scsi_eh.h>
55#include <scsi/scsi_tcq.h>
56
57#include <target/target_core_base.h>
58#include <target/target_core_fabric.h>
d9d660f6
JG		 59#include <target/target_core_fabric_configfs.h>
60
61#include <asm/hypervisor.h>
62
63#include <xen/xen.h>
64#include <xen/balloon.h>
65#include <xen/events.h>
66#include <xen/xenbus.h>
67#include <xen/grant_table.h>
68#include <xen/page.h>
69
70#include <xen/interface/grant_table.h>
71#include <xen/interface/io/vscsiif.h>
72
d9d660f6
JG		 73#define VSCSI_VERSION "v0.1"
74#define VSCSI_NAMELEN 32
75
76struct ids_tuple {
77 unsigned int hst; /* host */
78 unsigned int chn; /* channel */
79 unsigned int tgt; /* target */
80 unsigned int lun; /* LUN */
81};
82
83struct v2p_entry {
84 struct ids_tuple v; /* translate from */
85 struct scsiback_tpg *tpg; /* translate to */
86 unsigned int lun;
87 struct kref kref;
88 struct list_head l;
89};
90
91struct vscsibk_info {
92 struct xenbus_device *dev;
93
94 domid_t domid;
95 unsigned int irq;
96
97 struct vscsiif_back_ring ring;
98 int ring_error;
99
100 spinlock_t ring_lock;
101 atomic_t nr_unreplied_reqs;
102
103 spinlock_t v2p_lock;
104 struct list_head v2p_entry_lists;
105
106 wait_queue_head_t waiting_to_free;
107};
108
109/* theoretical maximum of grants for one request */
110#define VSCSI_MAX_GRANTS (SG_ALL + VSCSIIF_SG_TABLESIZE)
111
112/*
113 * VSCSI_GRANT_BATCH is the maximum number of grants to be processed in one
114 * call to map/unmap grants. Don't choose it too large, as there are arrays
115 * with VSCSI_GRANT_BATCH elements allocated on the stack.
116 */
117#define VSCSI_GRANT_BATCH 16
118
119struct vscsibk_pend {
120 uint16_t rqid;
121
122 uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE];
123 uint8_t cmd_len;
124
125 uint8_t sc_data_direction;
126 uint16_t n_sg; /* real length of SG list */
127 uint16_t n_grants; /* SG pages and potentially SG list */
128 uint32_t data_len;
129 uint32_t result;
130
131 struct vscsibk_info *info;
132 struct v2p_entry *v2p;
133 struct scatterlist *sgl;
134
135 uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE];
136
137 grant_handle_t grant_handles[VSCSI_MAX_GRANTS];
138 struct page *pages[VSCSI_MAX_GRANTS];
139
140 struct se_cmd se_cmd;
141};
142
143struct scsiback_tmr {
144 atomic_t tmr_complete;
145 wait_queue_head_t tmr_wait;
146};
147
148struct scsiback_nexus {
149 /* Pointer to TCM session for I_T Nexus */
150 struct se_session *tvn_se_sess;
151};
152
153struct scsiback_tport {
154 /* SCSI protocol the tport is providing */
155 u8 tport_proto_id;
156 /* Binary World Wide unique Port Name for pvscsi Target port */
157 u64 tport_wwpn;
158 /* ASCII formatted WWPN for pvscsi Target port */
159 char tport_name[VSCSI_NAMELEN];
160 /* Returned by scsiback_make_tport() */
161 struct se_wwn tport_wwn;
162};
163
164struct scsiback_tpg {
165 /* scsiback port target portal group tag for TCM */
166 u16 tport_tpgt;
167 /* track number of TPG Port/Lun Links wrt explicit I_T Nexus shutdown */
168 int tv_tpg_port_count;
169 /* xen-pvscsi references to tpg_nexus, protected by tv_tpg_mutex */
170 int tv_tpg_fe_count;
171 /* list for scsiback_list */
172 struct list_head tv_tpg_list;
173 /* Used to protect access for tpg_nexus */
174 struct mutex tv_tpg_mutex;
175 /* Pointer to the TCM pvscsi I_T Nexus for this TPG endpoint */
176 struct scsiback_nexus *tpg_nexus;
177 /* Pointer back to scsiback_tport */
178 struct scsiback_tport *tport;
179 /* Returned by scsiback_make_tpg() */
180 struct se_portal_group se_tpg;
181 /* alias used in xenstore */
182 char param_alias[VSCSI_NAMELEN];
183 /* list of info structures related to this target portal group */
184 struct list_head info_list;
185};
186
187#define SCSIBACK_INVALID_HANDLE (~0)
188
189static bool log_print_stat;
190module_param(log_print_stat, bool, 0644);
191
192static int scsiback_max_buffer_pages = 1024;
193module_param_named(max_buffer_pages, scsiback_max_buffer_pages, int, 0644);
194MODULE_PARM_DESC(max_buffer_pages,
195"Maximum number of free pages to keep in backend buffer");
196
197static struct kmem_cache *scsiback_cachep;
198static DEFINE_SPINLOCK(free_pages_lock);
199static int free_pages_num;
200static LIST_HEAD(scsiback_free_pages);
201
202/* Global spinlock to protect scsiback TPG list */
203static DEFINE_MUTEX(scsiback_mutex);
204static LIST_HEAD(scsiback_list);
205
9ac8928e 206static const struct target_core_fabric_ops scsiback_ops;
d9d660f6
JG		 207
208static void scsiback_get(struct vscsibk_info *info)
209{
210 atomic_inc(&info->nr_unreplied_reqs);
211}
212
213static void scsiback_put(struct vscsibk_info *info)
214{
215 if (atomic_dec_and_test(&info->nr_unreplied_reqs))
216 wake_up(&info->waiting_to_free);
217}
218
219static void put_free_pages(struct page **page, int num)
220{
221 unsigned long flags;
222 int i = free_pages_num + num, n = num;
223
224 if (num == 0)
225 return;
226 if (i > scsiback_max_buffer_pages) {
227 n = min(num, i - scsiback_max_buffer_pages);
ff4b156f 228 gnttab_free_pages(n, page + num - n);
d9d660f6
JG		 229 n = num - n;
230 }
231 spin_lock_irqsave(&free_pages_lock, flags);
232 for (i = 0; i < n; i++)
233 list_add(&page[i]->lru, &scsiback_free_pages);
234 free_pages_num += n;
235 spin_unlock_irqrestore(&free_pages_lock, flags);
236}
237
238static int get_free_page(struct page **page)
239{
240 unsigned long flags;
241
242 spin_lock_irqsave(&free_pages_lock, flags);
243 if (list_empty(&scsiback_free_pages)) {
244 spin_unlock_irqrestore(&free_pages_lock, flags);
ff4b156f 245 return gnttab_alloc_pages(1, page);
d9d660f6
JG		 246 }
247 page[0] = list_first_entry(&scsiback_free_pages, struct page, lru);
248 list_del(&page[0]->lru);
249 free_pages_num--;
250 spin_unlock_irqrestore(&free_pages_lock, flags);
251 return 0;
252}
253
254static unsigned long vaddr_page(struct page *page)
255{
256 unsigned long pfn = page_to_pfn(page);
257
258 return (unsigned long)pfn_to_kaddr(pfn);
259}
260
261static unsigned long vaddr(struct vscsibk_pend *req, int seg)
262{
263 return vaddr_page(req->pages[seg]);
264}
265
266static void scsiback_print_status(char *sense_buffer, int errors,
267 struct vscsibk_pend *pending_req)
268{
269 struct scsiback_tpg *tpg = pending_req->v2p->tpg;
270
78574878 271 pr_err("[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n",
d9d660f6
JG		 272 tpg->tport->tport_name, pending_req->v2p->lun,
273 pending_req->cmnd[0], status_byte(errors), msg_byte(errors),
274 host_byte(errors), driver_byte(errors));
d9d660f6
JG		 275}
276
277static void scsiback_fast_flush_area(struct vscsibk_pend *req)
278{
279 struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH];
280 struct page *pages[VSCSI_GRANT_BATCH];
281 unsigned int i, invcount = 0;
282 grant_handle_t handle;
283 int err;
284
285 kfree(req->sgl);
286 req->sgl = NULL;
287 req->n_sg = 0;
288
289 if (!req->n_grants)
290 return;
291
292 for (i = 0; i < req->n_grants; i++) {
293 handle = req->grant_handles[i];
294 if (handle == SCSIBACK_INVALID_HANDLE)
295 continue;
296 gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i),
297 GNTMAP_host_map, handle);
298 req->grant_handles[i] = SCSIBACK_INVALID_HANDLE;
299 pages[invcount] = req->pages[i];
300 put_page(pages[invcount]);
301 invcount++;
302 if (invcount < VSCSI_GRANT_BATCH)
303 continue;
304 err = gnttab_unmap_refs(unmap, NULL, pages, invcount);
305 BUG_ON(err);
306 invcount = 0;
307 }
308
309 if (invcount) {
310 err = gnttab_unmap_refs(unmap, NULL, pages, invcount);
311 BUG_ON(err);
312 }
313
314 put_free_pages(req->pages, req->n_grants);
315 req->n_grants = 0;
316}
317
318static void scsiback_free_translation_entry(struct kref *kref)
319{
320 struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref);
321 struct scsiback_tpg *tpg = entry->tpg;
322
323 mutex_lock(&tpg->tv_tpg_mutex);
324 tpg->tv_tpg_fe_count--;
325 mutex_unlock(&tpg->tv_tpg_mutex);
326
327 kfree(entry);
328}
329
330static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result,
331 uint32_t resid, struct vscsibk_pend *pending_req)
332{
333 struct vscsiif_response *ring_res;
334 struct vscsibk_info *info = pending_req->info;
335 int notify;
336 struct scsi_sense_hdr sshdr;
337 unsigned long flags;
338 unsigned len;
339
340 spin_lock_irqsave(&info->ring_lock, flags);
341
342 ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt);
343 info->ring.rsp_prod_pvt++;
344
345 ring_res->rslt = result;
346 ring_res->rqid = pending_req->rqid;
347
348 if (sense_buffer != NULL &&
349 scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE,
350 &sshdr)) {
351 len = min_t(unsigned, 8 + sense_buffer[7],
352 VSCSIIF_SENSE_BUFFERSIZE);
353 memcpy(ring_res->sense_buffer, sense_buffer, len);
354 ring_res->sense_len = len;
355 } else {
356 ring_res->sense_len = 0;
357 }
358
359 ring_res->residual_len = resid;
360
361 RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify);
362 spin_unlock_irqrestore(&info->ring_lock, flags);
363
364 if (notify)
365 notify_remote_via_irq(info->irq);
366
367 if (pending_req->v2p)
368 kref_put(&pending_req->v2p->kref,
369 scsiback_free_translation_entry);
370}
371
372static void scsiback_cmd_done(struct vscsibk_pend *pending_req)
373{
374 struct vscsibk_info *info = pending_req->info;
375 unsigned char *sense_buffer;
376 unsigned int resid;
377 int errors;
378
379 sense_buffer = pending_req->sense_buffer;
380 resid = pending_req->se_cmd.residual_count;
381 errors = pending_req->result;
382
383 if (errors && log_print_stat)
384 scsiback_print_status(sense_buffer, errors, pending_req);
385
386 scsiback_fast_flush_area(pending_req);
387 scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req);
388 scsiback_put(info);
389}
390
391static void scsiback_cmd_exec(struct vscsibk_pend *pending_req)
392{
393 struct se_cmd *se_cmd = &pending_req->se_cmd;
394 struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess;
395 int rc;
396
397 memset(pending_req->sense_buffer, 0, VSCSIIF_SENSE_BUFFERSIZE);
398
399 memset(se_cmd, 0, sizeof(*se_cmd));
400
401 scsiback_get(pending_req->info);
649ee054 402 se_cmd->tag = pending_req->rqid;
d9d660f6
JG		 403 rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd,
404 pending_req->sense_buffer, pending_req->v2p->lun,
405 pending_req->data_len, 0,
406 pending_req->sc_data_direction, 0,
407 pending_req->sgl, pending_req->n_sg,
408 NULL, 0, NULL, 0);
409 if (rc < 0) {
410 transport_send_check_condition_and_sense(se_cmd,
411 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0);
412 transport_generic_free_cmd(se_cmd, 0);
413 }
414}
415
416static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map,
417 struct page **pg, grant_handle_t *grant, int cnt)
418{
419 int err, i;
420
421 if (!cnt)
422 return 0;
423
424 err = gnttab_map_refs(map, NULL, pg, cnt);
425 BUG_ON(err);
426 for (i = 0; i < cnt; i++) {
427 if (unlikely(map[i].status != GNTST_okay)) {
78574878 428 pr_err("invalid buffer -- could not remap it\n");
d9d660f6
JG		 429 map[i].handle = SCSIBACK_INVALID_HANDLE;
430 err = -ENOMEM;
431 } else {
432 get_page(pg[i]);
433 }
434 grant[i] = map[i].handle;
435 }
436 return err;
437}
438
439static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req,
440 struct scsiif_request_segment *seg, struct page **pg,
441 grant_handle_t *grant, int cnt, u32 flags)
442{
443 int mapcount = 0, i, err = 0;
444 struct gnttab_map_grant_ref map[VSCSI_GRANT_BATCH];
445 struct vscsibk_info *info = pending_req->info;
446
447 for (i = 0; i < cnt; i++) {
448 if (get_free_page(pg + mapcount)) {
449 put_free_pages(pg, mapcount);
78574878 450 pr_err("no grant page\n");
d9d660f6
JG		 451 return -ENOMEM;
452 }
453 gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]),
454 flags, seg[i].gref, info->domid);
455 mapcount++;
456 if (mapcount < VSCSI_GRANT_BATCH)
457 continue;
458 err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount);
459 pg += mapcount;
460 grant += mapcount;
461 pending_req->n_grants += mapcount;
462 if (err)
463 return err;
464 mapcount = 0;
465 }
466 err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount);
467 pending_req->n_grants += mapcount;
468 return err;
469}
470
471static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req,
472 struct vscsibk_pend *pending_req)
473{
474 u32 flags;
475 int i, err, n_segs, i_seg = 0;
476 struct page **pg;
477 struct scsiif_request_segment *seg;
478 unsigned long end_seg = 0;
479 unsigned int nr_segments = (unsigned int)ring_req->nr_segments;
480 unsigned int nr_sgl = 0;
481 struct scatterlist *sg;
482 grant_handle_t *grant;
483
484 pending_req->n_sg = 0;
485 pending_req->n_grants = 0;
486 pending_req->data_len = 0;
487
488 nr_segments &= ~VSCSIIF_SG_GRANT;
489 if (!nr_segments)
490 return 0;
491
492 if (nr_segments > VSCSIIF_SG_TABLESIZE) {
78574878 493 pr_debug("invalid parameter nr_seg = %d\n",
d9d660f6
JG		 494 ring_req->nr_segments);
495 return -EINVAL;
496 }
497
498 if (ring_req->nr_segments & VSCSIIF_SG_GRANT) {
499 err = scsiback_gnttab_data_map_list(pending_req, ring_req->seg,
500 pending_req->pages, pending_req->grant_handles,
501 nr_segments, GNTMAP_host_map | GNTMAP_readonly);
502 if (err)
503 return err;
504 nr_sgl = nr_segments;
505 nr_segments = 0;
506 for (i = 0; i < nr_sgl; i++) {
507 n_segs = ring_req->seg[i].length /
508 sizeof(struct scsiif_request_segment);
509 if ((unsigned)ring_req->seg[i].offset +
510 (unsigned)ring_req->seg[i].length > PAGE_SIZE ||
511 n_segs * sizeof(struct scsiif_request_segment) !=
512 ring_req->seg[i].length)
513 return -EINVAL;
514 nr_segments += n_segs;
515 }
516 if (nr_segments > SG_ALL) {
78574878 517 pr_debug("invalid nr_seg = %d\n", nr_segments);
d9d660f6
JG		 518 return -EINVAL;
519 }
520 }
521
78574878 522 /* free of (sgl) in fast_flush_area() */
d9d660f6
JG		 523 pending_req->sgl = kmalloc_array(nr_segments,
524 sizeof(struct scatterlist), GFP_KERNEL);
525 if (!pending_req->sgl)
526 return -ENOMEM;
527
528 sg_init_table(pending_req->sgl, nr_segments);
529 pending_req->n_sg = nr_segments;
530
531 flags = GNTMAP_host_map;
532 if (pending_req->sc_data_direction == DMA_TO_DEVICE)
533 flags |= GNTMAP_readonly;
534
535 pg = pending_req->pages + nr_sgl;
536 grant = pending_req->grant_handles + nr_sgl;
537 if (!nr_sgl) {
538 seg = ring_req->seg;
539 err = scsiback_gnttab_data_map_list(pending_req, seg,
540 pg, grant, nr_segments, flags);
541 if (err)
542 return err;
543 } else {
544 for (i = 0; i < nr_sgl; i++) {
545 seg = (struct scsiif_request_segment *)(
546 vaddr(pending_req, i) + ring_req->seg[i].offset);
547 n_segs = ring_req->seg[i].length /
548 sizeof(struct scsiif_request_segment);
549 err = scsiback_gnttab_data_map_list(pending_req, seg,
550 pg, grant, n_segs, flags);
551 if (err)
552 return err;
553 pg += n_segs;
554 grant += n_segs;
555 }
556 end_seg = vaddr(pending_req, 0) + ring_req->seg[0].offset;
557 seg = (struct scsiif_request_segment *)end_seg;
558 end_seg += ring_req->seg[0].length;
559 pg = pending_req->pages + nr_sgl;
560 }
561
562 for_each_sg(pending_req->sgl, sg, nr_segments, i) {
563 sg_set_page(sg, pg[i], seg->length, seg->offset);
564 pending_req->data_len += seg->length;
565 seg++;
566 if (nr_sgl && (unsigned long)seg >= end_seg) {
567 i_seg++;
568 end_seg = vaddr(pending_req, i_seg) +
569 ring_req->seg[i_seg].offset;
570 seg = (struct scsiif_request_segment *)end_seg;
571 end_seg += ring_req->seg[i_seg].length;
572 }
573 if (sg->offset >= PAGE_SIZE ||
574 sg->length > PAGE_SIZE ||
575 sg->offset + sg->length > PAGE_SIZE)
576 return -EINVAL;
577 }
578
579 return 0;
580}
581
582static void scsiback_disconnect(struct vscsibk_info *info)
583{
584 wait_event(info->waiting_to_free,
585 atomic_read(&info->nr_unreplied_reqs) == 0);
586
587 unbind_from_irqhandler(info->irq, info);
588 info->irq = 0;
589 xenbus_unmap_ring_vfree(info->dev, info->ring.sring);
590}
591
592static void scsiback_device_action(struct vscsibk_pend *pending_req,
593 enum tcm_tmreq_table act, int tag)
594{
595 int rc, err = FAILED;
596 struct scsiback_tpg *tpg = pending_req->v2p->tpg;
597 struct se_cmd *se_cmd = &pending_req->se_cmd;
598 struct scsiback_tmr *tmr;
599
600 tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL);
601 if (!tmr)
602 goto out;
603
604 init_waitqueue_head(&tmr->tmr_wait);
605
606 transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo,
68d81f40 607 tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, TCM_SIMPLE_TAG,
d9d660f6
JG		 608 &pending_req->sense_buffer[0]);
609
610 rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL);
611 if (rc < 0)
612 goto out;
613
614 se_cmd->se_tmr_req->ref_task_tag = tag;
615
616 if (transport_lookup_tmr_lun(se_cmd, pending_req->v2p->lun) < 0)
617 goto out;
618
619 transport_generic_handle_tmr(se_cmd);
620 wait_event(tmr->tmr_wait, atomic_read(&tmr->tmr_complete));
621
622 err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ?
623 SUCCESS : FAILED;
624
625out:
626 if (tmr) {
627 transport_generic_free_cmd(&pending_req->se_cmd, 1);
628 kfree(tmr);
629 }
630
631 scsiback_do_resp_with_sense(NULL, err, 0, pending_req);
632
633 kmem_cache_free(scsiback_cachep, pending_req);
634}
635
636/*
637 Perform virtual to physical translation
638*/
639static struct v2p_entry *scsiback_do_translation(struct vscsibk_info *info,
640 struct ids_tuple *v)
641{
642 struct v2p_entry *entry;
643 struct list_head *head = &(info->v2p_entry_lists);
644 unsigned long flags;
645
646 spin_lock_irqsave(&info->v2p_lock, flags);
647 list_for_each_entry(entry, head, l) {
648 if ((entry->v.chn == v->chn) &&
649 (entry->v.tgt == v->tgt) &&
650 (entry->v.lun == v->lun)) {
651 kref_get(&entry->kref);
652 goto out;
653 }
654 }
655 entry = NULL;
656
657out:
658 spin_unlock_irqrestore(&info->v2p_lock, flags);
659 return entry;
660}
661
662static int prepare_pending_reqs(struct vscsibk_info *info,
663 struct vscsiif_request *ring_req,
664 struct vscsibk_pend *pending_req)
665{
666 struct v2p_entry *v2p;
667 struct ids_tuple vir;
668
669 pending_req->rqid = ring_req->rqid;
670 pending_req->info = info;
671
672 vir.chn = ring_req->channel;
673 vir.tgt = ring_req->id;
674 vir.lun = ring_req->lun;
675
676 v2p = scsiback_do_translation(info, &vir);
677 if (!v2p) {
678 pending_req->v2p = NULL;
78574878
TC		 679 pr_debug("the v2p of (chn:%d, tgt:%d, lun:%d) doesn't exist.\n",
680 vir.chn, vir.tgt, vir.lun);
d9d660f6
JG		 681 return -ENODEV;
682 }
683 pending_req->v2p = v2p;
684
685 /* request range check from frontend */
686 pending_req->sc_data_direction = ring_req->sc_data_direction;
687 if ((pending_req->sc_data_direction != DMA_BIDIRECTIONAL) &&
688 (pending_req->sc_data_direction != DMA_TO_DEVICE) &&
689 (pending_req->sc_data_direction != DMA_FROM_DEVICE) &&
690 (pending_req->sc_data_direction != DMA_NONE)) {
78574878 691 pr_debug("invalid parameter data_dir = %d\n",
d9d660f6
JG		 692 pending_req->sc_data_direction);
693 return -EINVAL;
694 }
695
696 pending_req->cmd_len = ring_req->cmd_len;
697 if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) {
78574878 698 pr_debug("invalid parameter cmd_len = %d\n",
d9d660f6
JG		 699 pending_req->cmd_len);
700 return -EINVAL;
701 }
702 memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len);
703
704 return 0;
705}
706
707static int scsiback_do_cmd_fn(struct vscsibk_info *info)
708{
709 struct vscsiif_back_ring *ring = &info->ring;
facb5732 710 struct vscsiif_request ring_req;
d9d660f6
JG		 711 struct vscsibk_pend *pending_req;
712 RING_IDX rc, rp;
713 int err, more_to_do;
714 uint32_t result;
d9d660f6
JG		 715
716 rc = ring->req_cons;
717 rp = ring->sring->req_prod;
718 rmb(); /* guest system is accessing ring, too */
719
720 if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) {
721 rc = ring->rsp_prod_pvt;
78574878 722 pr_warn("Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n",
d9d660f6
JG		 723 info->domid, rp, rc, rp - rc);
724 info->ring_error = 1;
725 return 0;
726 }
727
728 while ((rc != rp)) {
729 if (RING_REQUEST_CONS_OVERFLOW(ring, rc))
730 break;
731 pending_req = kmem_cache_alloc(scsiback_cachep, GFP_KERNEL);
732 if (!pending_req)
733 return 1;
734
facb5732 735 ring_req = *RING_GET_REQUEST(ring, rc);
d9d660f6
JG		 736 ring->req_cons = ++rc;
737
facb5732 738 err = prepare_pending_reqs(info, &ring_req, pending_req);
d9d660f6
JG		 739 if (err) {
740 switch (err) {
741 case -ENODEV:
742 result = DID_NO_CONNECT;
743 break;
744 default:
745 result = DRIVER_ERROR;
746 break;
747 }
748 scsiback_do_resp_with_sense(NULL, result << 24, 0,
749 pending_req);
750 kmem_cache_free(scsiback_cachep, pending_req);
751 return 1;
752 }
753
facb5732 754 switch (ring_req.act) {
d9d660f6 755 case VSCSIIF_ACT_SCSI_CDB:
facb5732 756 if (scsiback_gnttab_data_map(&ring_req, pending_req)) {
d9d660f6
JG		 757 scsiback_fast_flush_area(pending_req);
758 scsiback_do_resp_with_sense(NULL,
759 DRIVER_ERROR << 24, 0, pending_req);
760 kmem_cache_free(scsiback_cachep, pending_req);
761 } else {
762 scsiback_cmd_exec(pending_req);
763 }
764 break;
765 case VSCSIIF_ACT_SCSI_ABORT:
766 scsiback_device_action(pending_req, TMR_ABORT_TASK,
facb5732 767 ring_req.ref_rqid);
d9d660f6
JG		 768 break;
769 case VSCSIIF_ACT_SCSI_RESET:
770 scsiback_device_action(pending_req, TMR_LUN_RESET, 0);
771 break;
772 default:
78574878 773 pr_err_ratelimited("invalid request\n");
d9d660f6
JG		 774 scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24,
775 0, pending_req);
776 kmem_cache_free(scsiback_cachep, pending_req);
777 break;
778 }
779
780 /* Yield point for this unbounded loop. */
781 cond_resched();
782 }
783
784 RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do);
785 return more_to_do;
786}
787
788static irqreturn_t scsiback_irq_fn(int irq, void *dev_id)
789{
790 struct vscsibk_info *info = dev_id;
791
792 if (info->ring_error)
793 return IRQ_HANDLED;
794
795 while (scsiback_do_cmd_fn(info))
796 cond_resched();
797
798 return IRQ_HANDLED;
799}
800
801static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref,
802 evtchn_port_t evtchn)
803{
804 void *area;
805 struct vscsiif_sring *sring;
806 int err;
807
808 if (info->irq)
809 return -1;
810
ccc9d90a 811 err = xenbus_map_ring_valloc(info->dev, &ring_ref, 1, &area);
d9d660f6
JG		 812 if (err)
813 return err;
814
815 sring = (struct vscsiif_sring *)area;
816 BACK_RING_INIT(&info->ring, sring, PAGE_SIZE);
817
818 err = bind_interdomain_evtchn_to_irq(info->domid, evtchn);
819 if (err < 0)
820 goto unmap_page;
821
822 info->irq = err;
823
824 err = request_threaded_irq(info->irq, NULL, scsiback_irq_fn,
825 IRQF_ONESHOT, "vscsiif-backend", info);
826 if (err)
827 goto free_irq;
828
829 return 0;
830
831free_irq:
832 unbind_from_irqhandler(info->irq, info);
833 info->irq = 0;
834unmap_page:
835 xenbus_unmap_ring_vfree(info->dev, area);
836
837 return err;
838}
839
840static int scsiback_map(struct vscsibk_info *info)
841{
842 struct xenbus_device *dev = info->dev;
843 unsigned int ring_ref, evtchn;
844 int err;
845
846 err = xenbus_gather(XBT_NIL, dev->otherend,
847 "ring-ref", "%u", &ring_ref,
848 "event-channel", "%u", &evtchn, NULL);
849 if (err) {
850 xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend);
851 return err;
852 }
853
854 return scsiback_init_sring(info, ring_ref, evtchn);
855}
856
857/*
858 Add a new translation entry
859*/
860static int scsiback_add_translation_entry(struct vscsibk_info *info,
861 char *phy, struct ids_tuple *v)
862{
863 int err = 0;
864 struct v2p_entry *entry;
865 struct v2p_entry *new;
866 struct list_head *head = &(info->v2p_entry_lists);
867 unsigned long flags;
868 char *lunp;
869 unsigned int lun;
870 struct scsiback_tpg *tpg_entry, *tpg = NULL;
871 char *error = "doesn't exist";
872
873 lunp = strrchr(phy, ':');
874 if (!lunp) {
78574878 875 pr_err("illegal format of physical device %s\n", phy);
d9d660f6
JG		 876 return -EINVAL;
877 }
878 *lunp = 0;
879 lunp++;
880 if (kstrtouint(lunp, 10, &lun) || lun >= TRANSPORT_MAX_LUNS_PER_TPG) {
78574878 881 pr_err("lun number not valid: %s\n", lunp);
d9d660f6
JG		 882 return -EINVAL;
883 }
884
885 mutex_lock(&scsiback_mutex);
886 list_for_each_entry(tpg_entry, &scsiback_list, tv_tpg_list) {
887 if (!strcmp(phy, tpg_entry->tport->tport_name) ||
888 !strcmp(phy, tpg_entry->param_alias)) {
889 spin_lock(&tpg_entry->se_tpg.tpg_lun_lock);
890 if (tpg_entry->se_tpg.tpg_lun_list[lun]->lun_status ==
891 TRANSPORT_LUN_STATUS_ACTIVE) {
892 if (!tpg_entry->tpg_nexus)
893 error = "nexus undefined";
894 else
895 tpg = tpg_entry;
896 }
897 spin_unlock(&tpg_entry->se_tpg.tpg_lun_lock);
898 break;
899 }
900 }
901 if (tpg) {
902 mutex_lock(&tpg->tv_tpg_mutex);
903 tpg->tv_tpg_fe_count++;
904 mutex_unlock(&tpg->tv_tpg_mutex);
905 }
906 mutex_unlock(&scsiback_mutex);
907
908 if (!tpg) {
78574878 909 pr_err("%s:%d %s\n", phy, lun, error);
d9d660f6
JG		 910 return -ENODEV;
911 }
912
913 new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL);
914 if (new == NULL) {
915 err = -ENOMEM;
916 goto out_free;
917 }
918
919 spin_lock_irqsave(&info->v2p_lock, flags);
920
921 /* Check double assignment to identical virtual ID */
922 list_for_each_entry(entry, head, l) {
923 if ((entry->v.chn == v->chn) &&
924 (entry->v.tgt == v->tgt) &&
925 (entry->v.lun == v->lun)) {
78574878 926 pr_warn("Virtual ID is already used. Assignment was not performed.\n");
d9d660f6
JG		 927 err = -EEXIST;
928 goto out;
929 }
930
931 }
932
933 /* Create a new translation entry and add to the list */
934 kref_init(&new->kref);
935 new->v = *v;
936 new->tpg = tpg;
937 new->lun = lun;
938 list_add_tail(&new->l, head);
939
940out:
941 spin_unlock_irqrestore(&info->v2p_lock, flags);
942
943out_free:
944 mutex_lock(&tpg->tv_tpg_mutex);
945 tpg->tv_tpg_fe_count--;
946 mutex_unlock(&tpg->tv_tpg_mutex);
947
948 if (err)
949 kfree(new);
950
951 return err;
952}
953
954static void __scsiback_del_translation_entry(struct v2p_entry *entry)
955{
956 list_del(&entry->l);
957 kref_put(&entry->kref, scsiback_free_translation_entry);
958}
959
960/*
961 Delete the translation entry specfied
962*/
963static int scsiback_del_translation_entry(struct vscsibk_info *info,
964 struct ids_tuple *v)
965{
966 struct v2p_entry *entry;
967 struct list_head *head = &(info->v2p_entry_lists);
968 unsigned long flags;
969
970 spin_lock_irqsave(&info->v2p_lock, flags);
971 /* Find out the translation entry specified */
972 list_for_each_entry(entry, head, l) {
973 if ((entry->v.chn == v->chn) &&
974 (entry->v.tgt == v->tgt) &&
975 (entry->v.lun == v->lun)) {
976 goto found;
977 }
978 }
979
980 spin_unlock_irqrestore(&info->v2p_lock, flags);
981 return 1;
982
983found:
984 /* Delete the translation entry specfied */
985 __scsiback_del_translation_entry(entry);
986
987 spin_unlock_irqrestore(&info->v2p_lock, flags);
988 return 0;
989}
990
991static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state,
169e6cf0 992 char *phy, struct ids_tuple *vir, int try)
d9d660f6
JG		 993{
994 if (!scsiback_add_translation_entry(info, phy, vir)) {
995 if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
996 "%d", XenbusStateInitialised)) {
78574878 997 pr_err("xenbus_printf error %s\n", state);
d9d660f6
JG		 998 scsiback_del_translation_entry(info, vir);
999 }
169e6cf0 1000 } else if (!try) {
d9d660f6
JG		 1001 xenbus_printf(XBT_NIL, info->dev->nodename, state,
1002 "%d", XenbusStateClosed);
1003 }
1004}
1005
1006static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state,
1007 struct ids_tuple *vir)
1008{
1009 if (!scsiback_del_translation_entry(info, vir)) {
1010 if (xenbus_printf(XBT_NIL, info->dev->nodename, state,
1011 "%d", XenbusStateClosed))
78574878 1012 pr_err("xenbus_printf error %s\n", state);
d9d660f6
JG		 1013 }
1014}
1015
1016#define VSCSIBACK_OP_ADD_OR_DEL_LUN 1
1017#define VSCSIBACK_OP_UPDATEDEV_STATE 2
1018
1019static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op,
1020 char *ent)
1021{
1022 int err;
1023 struct ids_tuple vir;
1024 char *val;
1025 int device_state;
1026 char phy[VSCSI_NAMELEN];
1027 char str[64];
1028 char state[64];
1029 struct xenbus_device *dev = info->dev;
1030
1031 /* read status */
1032 snprintf(state, sizeof(state), "vscsi-devs/%s/state", ent);
1033 err = xenbus_scanf(XBT_NIL, dev->nodename, state, "%u", &device_state);
1034 if (XENBUS_EXIST_ERR(err))
1035 return;
1036
1037 /* physical SCSI device */
1038 snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent);
1039 val = xenbus_read(XBT_NIL, dev->nodename, str, NULL);
1040 if (IS_ERR(val)) {
1041 xenbus_printf(XBT_NIL, dev->nodename, state,
1042 "%d", XenbusStateClosed);
1043 return;
1044 }
1045 strlcpy(phy, val, VSCSI_NAMELEN);
1046 kfree(val);
1047
1048 /* virtual SCSI device */
1049 snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", ent);
1050 err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u",
1051 &vir.hst, &vir.chn, &vir.tgt, &vir.lun);
1052 if (XENBUS_EXIST_ERR(err)) {
1053 xenbus_printf(XBT_NIL, dev->nodename, state,
1054 "%d", XenbusStateClosed);
1055 return;
1056 }
1057
1058 switch (op) {
1059 case VSCSIBACK_OP_ADD_OR_DEL_LUN:
169e6cf0
JG		 1060 switch (device_state) {
1061 case XenbusStateInitialising:
1062 scsiback_do_add_lun(info, state, phy, &vir, 0);
1063 break;
1064 case XenbusStateConnected:
1065 scsiback_do_add_lun(info, state, phy, &vir, 1);
1066 break;
1067 case XenbusStateClosing:
d9d660f6 1068 scsiback_do_del_lun(info, state, &vir);
169e6cf0
JG		 1069 break;
1070 default:
1071 break;
1072 }
d9d660f6
JG		 1073 break;
1074
1075 case VSCSIBACK_OP_UPDATEDEV_STATE:
1076 if (device_state == XenbusStateInitialised) {
1077 /* modify vscsi-devs/dev-x/state */
1078 if (xenbus_printf(XBT_NIL, dev->nodename, state,
1079 "%d", XenbusStateConnected)) {
78574878 1080 pr_err("xenbus_printf error %s\n", str);
d9d660f6
JG		 1081 scsiback_del_translation_entry(info, &vir);
1082 xenbus_printf(XBT_NIL, dev->nodename, state,
1083 "%d", XenbusStateClosed);
1084 }
1085 }
1086 break;
78574878 1087 /* When it is necessary, processing is added here. */
d9d660f6
JG		 1088 default:
1089 break;
1090 }
1091}
1092
1093static void scsiback_do_lun_hotplug(struct vscsibk_info *info, int op)
1094{
1095 int i;
1096 char **dir;
1097 unsigned int ndir = 0;
1098
1099 dir = xenbus_directory(XBT_NIL, info->dev->nodename, "vscsi-devs",
1100 &ndir);
1101 if (IS_ERR(dir))
1102 return;
1103
1104 for (i = 0; i < ndir; i++)
1105 scsiback_do_1lun_hotplug(info, op, dir[i]);
1106
1107 kfree(dir);
1108}
1109
1110static void scsiback_frontend_changed(struct xenbus_device *dev,
1111 enum xenbus_state frontend_state)
1112{
1113 struct vscsibk_info *info = dev_get_drvdata(&dev->dev);
1114
1115 switch (frontend_state) {
1116 case XenbusStateInitialising:
1117 break;
1118
1119 case XenbusStateInitialised:
1120 if (scsiback_map(info))
1121 break;
1122
1123 scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN);
1124 xenbus_switch_state(dev, XenbusStateConnected);
1125 break;
1126
1127 case XenbusStateConnected:
1128 scsiback_do_lun_hotplug(info, VSCSIBACK_OP_UPDATEDEV_STATE);
1129
1130 if (dev->state == XenbusStateConnected)
1131 break;
1132
1133 xenbus_switch_state(dev, XenbusStateConnected);
1134 break;
1135
1136 case XenbusStateClosing:
1137 if (info->irq)
1138 scsiback_disconnect(info);
1139
1140 xenbus_switch_state(dev, XenbusStateClosing);
1141 break;
1142
1143 case XenbusStateClosed:
1144 xenbus_switch_state(dev, XenbusStateClosed);
1145 if (xenbus_dev_is_online(dev))
1146 break;
1147 /* fall through if not online */
1148 case XenbusStateUnknown:
1149 device_unregister(&dev->dev);
1150 break;
1151
1152 case XenbusStateReconfiguring:
1153 scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN);
1154 xenbus_switch_state(dev, XenbusStateReconfigured);
1155
1156 break;
1157
1158 default:
1159 xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend",
1160 frontend_state);
1161 break;
1162 }
1163}
1164
1165/*
1166 Release the translation entry specfied
1167*/
1168static void scsiback_release_translation_entry(struct vscsibk_info *info)
1169{
1170 struct v2p_entry *entry, *tmp;
1171 struct list_head *head = &(info->v2p_entry_lists);
1172 unsigned long flags;
1173
1174 spin_lock_irqsave(&info->v2p_lock, flags);
1175
1176 list_for_each_entry_safe(entry, tmp, head, l)
1177 __scsiback_del_translation_entry(entry);
1178
1179 spin_unlock_irqrestore(&info->v2p_lock, flags);
1180}
1181
1182static int scsiback_remove(struct xenbus_device *dev)
1183{
1184 struct vscsibk_info *info = dev_get_drvdata(&dev->dev);
1185
1186 if (info->irq)
1187 scsiback_disconnect(info);
1188
1189 scsiback_release_translation_entry(info);
1190
1191 dev_set_drvdata(&dev->dev, NULL);
1192
1193 return 0;
1194}
1195
1196static int scsiback_probe(struct xenbus_device *dev,
1197 const struct xenbus_device_id *id)
1198{
1199 int err;
1200
1201 struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info),
1202 GFP_KERNEL);
1203
78574878 1204 pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id);
d9d660f6
JG		 1205
1206 if (!info) {
1207 xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure");
1208 return -ENOMEM;
1209 }
1210 info->dev = dev;
1211 dev_set_drvdata(&dev->dev, info);
1212
1213 info->domid = dev->otherend_id;
1214 spin_lock_init(&info->ring_lock);
1215 info->ring_error = 0;
1216 atomic_set(&info->nr_unreplied_reqs, 0);
1217 init_waitqueue_head(&info->waiting_to_free);
1218 info->dev = dev;
1219 info->irq = 0;
1220 INIT_LIST_HEAD(&info->v2p_entry_lists);
1221 spin_lock_init(&info->v2p_lock);
1222
1223 err = xenbus_printf(XBT_NIL, dev->nodename, "feature-sg-grant", "%u",
1224 SG_ALL);
1225 if (err)
1226 xenbus_dev_error(dev, err, "writing feature-sg-grant");
1227
1228 err = xenbus_switch_state(dev, XenbusStateInitWait);
1229 if (err)
1230 goto fail;
1231
1232 return 0;
1233
1234fail:
78574878 1235 pr_warn("%s failed\n", __func__);
d9d660f6
JG		 1236 scsiback_remove(dev);
1237
1238 return err;
1239}
1240
1241static char *scsiback_dump_proto_id(struct scsiback_tport *tport)
1242{
1243 switch (tport->tport_proto_id) {
1244 case SCSI_PROTOCOL_SAS:
1245 return "SAS";
1246 case SCSI_PROTOCOL_FCP:
1247 return "FCP";
1248 case SCSI_PROTOCOL_ISCSI:
1249 return "iSCSI";
1250 default:
1251 break;
1252 }
1253
1254 return "Unknown";
1255}
1256
d9d660f6
JG		 1257static char *scsiback_get_fabric_wwn(struct se_portal_group *se_tpg)
1258{
1259 struct scsiback_tpg *tpg = container_of(se_tpg,
1260 struct scsiback_tpg, se_tpg);
1261 struct scsiback_tport *tport = tpg->tport;
1262
1263 return &tport->tport_name[0];
1264}
1265
1266static u16 scsiback_get_tag(struct se_portal_group *se_tpg)
1267{
1268 struct scsiback_tpg *tpg = container_of(se_tpg,
1269 struct scsiback_tpg, se_tpg);
1270 return tpg->tport_tpgt;
1271}
1272
d9d660f6
JG		 1273static struct se_wwn *
1274scsiback_make_tport(struct target_fabric_configfs *tf,
1275 struct config_group *group,
1276 const char *name)
1277{
1278 struct scsiback_tport *tport;
1279 char *ptr;
1280 u64 wwpn = 0;
1281 int off = 0;
1282
1283 tport = kzalloc(sizeof(struct scsiback_tport), GFP_KERNEL);
1284 if (!tport)
1285 return ERR_PTR(-ENOMEM);
1286
1287 tport->tport_wwpn = wwpn;
1288 /*
1289 * Determine the emulated Protocol Identifier and Target Port Name
1290 * based on the incoming configfs directory name.
1291 */
1292 ptr = strstr(name, "naa.");
1293 if (ptr) {
1294 tport->tport_proto_id = SCSI_PROTOCOL_SAS;
1295 goto check_len;
1296 }
1297 ptr = strstr(name, "fc.");
1298 if (ptr) {
1299 tport->tport_proto_id = SCSI_PROTOCOL_FCP;
1300 off = 3; /* Skip over "fc." */
1301 goto check_len;
1302 }
1303 ptr = strstr(name, "iqn.");
1304 if (ptr) {
1305 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI;
1306 goto check_len;
1307 }
1308
1309 pr_err("Unable to locate prefix for emulated Target Port: %s\n", name);
1310 kfree(tport);
1311 return ERR_PTR(-EINVAL);
1312
1313check_len:
1314 if (strlen(name) >= VSCSI_NAMELEN) {
1315 pr_err("Emulated %s Address: %s, exceeds max: %d\n", name,
1316 scsiback_dump_proto_id(tport), VSCSI_NAMELEN);
1317 kfree(tport);
1318 return ERR_PTR(-EINVAL);
1319 }
1320 snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]);
1321
78574878 1322 pr_debug("Allocated emulated Target %s Address: %s\n",
d9d660f6
JG		 1323 scsiback_dump_proto_id(tport), name);
1324
1325 return &tport->tport_wwn;
1326}
1327
1328static void scsiback_drop_tport(struct se_wwn *wwn)
1329{
1330 struct scsiback_tport *tport = container_of(wwn,
1331 struct scsiback_tport, tport_wwn);
1332
78574878 1333 pr_debug("Deallocating emulated Target %s Address: %s\n",
d9d660f6
JG		 1334 scsiback_dump_proto_id(tport), tport->tport_name);
1335
1336 kfree(tport);
1337}
1338
d9d660f6
JG		 1339static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg)
1340{
1341 return 1;
1342}
1343
1344static int scsiback_check_stop_free(struct se_cmd *se_cmd)
1345{
1346 /*
78574878
TC		 1347 * Do not release struct se_cmd's containing a valid TMR pointer.
1348 * These will be released directly in scsiback_device_action()
d9d660f6
JG		 1349 * with transport_generic_free_cmd().
1350 */
1351 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB)
1352 return 0;
1353
1354 transport_generic_free_cmd(se_cmd, 0);
1355 return 1;
1356}
1357
1358static void scsiback_release_cmd(struct se_cmd *se_cmd)
1359{
1360 struct vscsibk_pend *pending_req = container_of(se_cmd,
1361 struct vscsibk_pend, se_cmd);
1362
1363 kmem_cache_free(scsiback_cachep, pending_req);
1364}
1365
1366static int scsiback_shutdown_session(struct se_session *se_sess)
1367{
1368 return 0;
1369}
1370
1371static void scsiback_close_session(struct se_session *se_sess)
1372{
1373}
1374
1375static u32 scsiback_sess_get_index(struct se_session *se_sess)
1376{
1377 return 0;
1378}
1379
1380static int scsiback_write_pending(struct se_cmd *se_cmd)
1381{
1382 /* Go ahead and process the write immediately */
1383 target_execute_cmd(se_cmd);
1384
1385 return 0;
1386}
1387
1388static int scsiback_write_pending_status(struct se_cmd *se_cmd)
1389{
1390 return 0;
1391}
1392
1393static void scsiback_set_default_node_attrs(struct se_node_acl *nacl)
1394{
1395}
1396
d9d660f6
JG		 1397static int scsiback_get_cmd_state(struct se_cmd *se_cmd)
1398{
1399 return 0;
1400}
1401
1402static int scsiback_queue_data_in(struct se_cmd *se_cmd)
1403{
1404 struct vscsibk_pend *pending_req = container_of(se_cmd,
1405 struct vscsibk_pend, se_cmd);
1406
1407 pending_req->result = SAM_STAT_GOOD;
1408 scsiback_cmd_done(pending_req);
1409 return 0;
1410}
1411
1412static int scsiback_queue_status(struct se_cmd *se_cmd)
1413{
1414 struct vscsibk_pend *pending_req = container_of(se_cmd,
1415 struct vscsibk_pend, se_cmd);
1416
1417 if (se_cmd->sense_buffer &&
1418 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) ||
1419 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE)))
1420 pending_req->result = (DRIVER_SENSE << 24) |
1421 SAM_STAT_CHECK_CONDITION;
1422 else
1423 pending_req->result = se_cmd->scsi_status;
1424
1425 scsiback_cmd_done(pending_req);
1426 return 0;
1427}
1428
1429static void scsiback_queue_tm_rsp(struct se_cmd *se_cmd)
1430{
1431 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req;
1432 struct scsiback_tmr *tmr = se_tmr->fabric_tmr_ptr;
1433
1434 atomic_set(&tmr->tmr_complete, 1);
1435 wake_up(&tmr->tmr_wait);
1436}
1437
1438static void scsiback_aborted_task(struct se_cmd *se_cmd)
1439{
1440}
1441
1442static ssize_t scsiback_tpg_param_show_alias(struct se_portal_group *se_tpg,
1443 char *page)
1444{
1445 struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg,
1446 se_tpg);
1447 ssize_t rb;
1448
1449 mutex_lock(&tpg->tv_tpg_mutex);
1450 rb = snprintf(page, PAGE_SIZE, "%s\n", tpg->param_alias);
1451 mutex_unlock(&tpg->tv_tpg_mutex);
1452
1453 return rb;
1454}
1455
1456static ssize_t scsiback_tpg_param_store_alias(struct se_portal_group *se_tpg,
1457 const char *page, size_t count)
1458{
1459 struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg,
1460 se_tpg);
1461 int len;
1462
1463 if (strlen(page) >= VSCSI_NAMELEN) {
1464 pr_err("param alias: %s, exceeds max: %d\n", page,
1465 VSCSI_NAMELEN);
1466 return -EINVAL;
1467 }
1468
1469 mutex_lock(&tpg->tv_tpg_mutex);
1470 len = snprintf(tpg->param_alias, VSCSI_NAMELEN, "%s", page);
1471 if (tpg->param_alias[len - 1] == '\n')
1472 tpg->param_alias[len - 1] = '\0';
1473 mutex_unlock(&tpg->tv_tpg_mutex);
1474
1475 return count;
1476}
1477
1478TF_TPG_PARAM_ATTR(scsiback, alias, S_IRUGO | S_IWUSR);
1479
1480static struct configfs_attribute *scsiback_param_attrs[] = {
1481 &scsiback_tpg_param_alias.attr,
1482 NULL,
1483};
1484
1485static int scsiback_make_nexus(struct scsiback_tpg *tpg,
1486 const char *name)
1487{
1488 struct se_portal_group *se_tpg;
1489 struct se_session *se_sess;
1490 struct scsiback_nexus *tv_nexus;
1491
1492 mutex_lock(&tpg->tv_tpg_mutex);
1493 if (tpg->tpg_nexus) {
1494 mutex_unlock(&tpg->tv_tpg_mutex);
1495 pr_debug("tpg->tpg_nexus already exists\n");
1496 return -EEXIST;
1497 }
1498 se_tpg = &tpg->se_tpg;
1499
1500 tv_nexus = kzalloc(sizeof(struct scsiback_nexus), GFP_KERNEL);
1501 if (!tv_nexus) {
1502 mutex_unlock(&tpg->tv_tpg_mutex);
1503 return -ENOMEM;
1504 }
1505 /*
78574878 1506 * Initialize the struct se_session pointer
d9d660f6
JG		 1507 */
1508 tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL);
1509 if (IS_ERR(tv_nexus->tvn_se_sess)) {
1510 mutex_unlock(&tpg->tv_tpg_mutex);
1511 kfree(tv_nexus);
1512 return -ENOMEM;
1513 }
1514 se_sess = tv_nexus->tvn_se_sess;
1515 /*
1516 * Since we are running in 'demo mode' this call with generate a
1517 * struct se_node_acl for the scsiback struct se_portal_group with
1518 * the SCSI Initiator port name of the passed configfs group 'name'.
1519 */
1520 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl(
1521 se_tpg, (unsigned char *)name);
1522 if (!tv_nexus->tvn_se_sess->se_node_acl) {
1523 mutex_unlock(&tpg->tv_tpg_mutex);
1524 pr_debug("core_tpg_check_initiator_node_acl() failed for %s\n",
1525 name);
1526 goto out;
1527 }
2f450cc1
BVA		 1528 /* Now register the TCM pvscsi virtual I_T Nexus as active. */
1529 transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl,
d9d660f6
JG		 1530 tv_nexus->tvn_se_sess, tv_nexus);
1531 tpg->tpg_nexus = tv_nexus;
1532
1533 mutex_unlock(&tpg->tv_tpg_mutex);
1534 return 0;
1535
1536out:
1537 transport_free_session(se_sess);
1538 kfree(tv_nexus);
1539 return -ENOMEM;
1540}
1541
1542static int scsiback_drop_nexus(struct scsiback_tpg *tpg)
1543{
1544 struct se_session *se_sess;
1545 struct scsiback_nexus *tv_nexus;
1546
1547 mutex_lock(&tpg->tv_tpg_mutex);
1548 tv_nexus = tpg->tpg_nexus;
1549 if (!tv_nexus) {
1550 mutex_unlock(&tpg->tv_tpg_mutex);
1551 return -ENODEV;
1552 }
1553
1554 se_sess = tv_nexus->tvn_se_sess;
1555 if (!se_sess) {
1556 mutex_unlock(&tpg->tv_tpg_mutex);
1557 return -ENODEV;
1558 }
1559
1560 if (tpg->tv_tpg_port_count != 0) {
1561 mutex_unlock(&tpg->tv_tpg_mutex);
1562 pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG port count: %d\n",
1563 tpg->tv_tpg_port_count);
1564 return -EBUSY;
1565 }
1566
1567 if (tpg->tv_tpg_fe_count != 0) {
1568 mutex_unlock(&tpg->tv_tpg_mutex);
1569 pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG frontend count: %d\n",
1570 tpg->tv_tpg_fe_count);
1571 return -EBUSY;
1572 }
1573
78574878 1574 pr_debug("Removing I_T Nexus to emulated %s Initiator Port: %s\n",
d9d660f6
JG		 1575 scsiback_dump_proto_id(tpg->tport),
1576 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1577
1578 /*
1579 * Release the SCSI I_T Nexus to the emulated xen-pvscsi Target Port
1580 */
1581 transport_deregister_session(tv_nexus->tvn_se_sess);
1582 tpg->tpg_nexus = NULL;
1583 mutex_unlock(&tpg->tv_tpg_mutex);
1584
1585 kfree(tv_nexus);
1586 return 0;
1587}
1588
1589static ssize_t scsiback_tpg_show_nexus(struct se_portal_group *se_tpg,
1590 char *page)
1591{
1592 struct scsiback_tpg *tpg = container_of(se_tpg,
1593 struct scsiback_tpg, se_tpg);
1594 struct scsiback_nexus *tv_nexus;
1595 ssize_t ret;
1596
1597 mutex_lock(&tpg->tv_tpg_mutex);
1598 tv_nexus = tpg->tpg_nexus;
1599 if (!tv_nexus) {
1600 mutex_unlock(&tpg->tv_tpg_mutex);
1601 return -ENODEV;
1602 }
1603 ret = snprintf(page, PAGE_SIZE, "%s\n",
1604 tv_nexus->tvn_se_sess->se_node_acl->initiatorname);
1605 mutex_unlock(&tpg->tv_tpg_mutex);
1606
1607 return ret;
1608}
1609
1610static ssize_t scsiback_tpg_store_nexus(struct se_portal_group *se_tpg,
1611 const char *page,
1612 size_t count)
1613{
1614 struct scsiback_tpg *tpg = container_of(se_tpg,
1615 struct scsiback_tpg, se_tpg);
1616 struct scsiback_tport *tport_wwn = tpg->tport;
1617 unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr;
1618 int ret;
1619 /*
78574878 1620 * Shutdown the active I_T nexus if 'NULL' is passed.
d9d660f6
JG		 1621 */
1622 if (!strncmp(page, "NULL", 4)) {
1623 ret = scsiback_drop_nexus(tpg);
1624 return (!ret) ? count : ret;
1625 }
1626 /*
1627 * Otherwise make sure the passed virtual Initiator port WWN matches
1628 * the fabric protocol_id set in scsiback_make_tport(), and call
1629 * scsiback_make_nexus().
1630 */
1631 if (strlen(page) >= VSCSI_NAMELEN) {
1632 pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n",
1633 page, VSCSI_NAMELEN);
1634 return -EINVAL;
1635 }
1636 snprintf(&i_port[0], VSCSI_NAMELEN, "%s", page);
1637
1638 ptr = strstr(i_port, "naa.");
1639 if (ptr) {
1640 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) {
1641 pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n",
1642 i_port, scsiback_dump_proto_id(tport_wwn));
1643 return -EINVAL;
1644 }
1645 port_ptr = &i_port[0];
1646 goto check_newline;
1647 }
1648 ptr = strstr(i_port, "fc.");
1649 if (ptr) {
1650 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) {
1651 pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n",
1652 i_port, scsiback_dump_proto_id(tport_wwn));
1653 return -EINVAL;
1654 }
1655 port_ptr = &i_port[3]; /* Skip over "fc." */
1656 goto check_newline;
1657 }
1658 ptr = strstr(i_port, "iqn.");
1659 if (ptr) {
1660 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) {
1661 pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n",
1662 i_port, scsiback_dump_proto_id(tport_wwn));
1663 return -EINVAL;
1664 }
1665 port_ptr = &i_port[0];
1666 goto check_newline;
1667 }
1668 pr_err("Unable to locate prefix for emulated Initiator Port: %s\n",
1669 i_port);
1670 return -EINVAL;
1671 /*
1672 * Clear any trailing newline for the NAA WWN
1673 */
1674check_newline:
1675 if (i_port[strlen(i_port) - 1] == '\n')
1676 i_port[strlen(i_port) - 1] = '\0';
1677
1678 ret = scsiback_make_nexus(tpg, port_ptr);
1679 if (ret < 0)
1680 return ret;
1681
1682 return count;
1683}
1684
1685TF_TPG_BASE_ATTR(scsiback, nexus, S_IRUGO | S_IWUSR);
1686
1687static struct configfs_attribute *scsiback_tpg_attrs[] = {
1688 &scsiback_tpg_nexus.attr,
1689 NULL,
1690};
1691
1692static ssize_t
1693scsiback_wwn_show_attr_version(struct target_fabric_configfs *tf,
1694 char *page)
1695{
1696 return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on "
1697 UTS_RELEASE"\n",
1698 VSCSI_VERSION, utsname()->sysname, utsname()->machine);
1699}
1700
1701TF_WWN_ATTR_RO(scsiback, version);
1702
1703static struct configfs_attribute *scsiback_wwn_attrs[] = {
1704 &scsiback_wwn_version.attr,
1705 NULL,
1706};
1707
1708static char *scsiback_get_fabric_name(void)
1709{
1710 return "xen-pvscsi";
1711}
1712
1713static int scsiback_port_link(struct se_portal_group *se_tpg,
1714 struct se_lun *lun)
1715{
1716 struct scsiback_tpg *tpg = container_of(se_tpg,
1717 struct scsiback_tpg, se_tpg);
1718
1719 mutex_lock(&tpg->tv_tpg_mutex);
1720 tpg->tv_tpg_port_count++;
1721 mutex_unlock(&tpg->tv_tpg_mutex);
1722
1723 return 0;
1724}
1725
1726static void scsiback_port_unlink(struct se_portal_group *se_tpg,
1727 struct se_lun *lun)
1728{
1729 struct scsiback_tpg *tpg = container_of(se_tpg,
1730 struct scsiback_tpg, se_tpg);
1731
1732 mutex_lock(&tpg->tv_tpg_mutex);
1733 tpg->tv_tpg_port_count--;
1734 mutex_unlock(&tpg->tv_tpg_mutex);
1735}
1736
1737static struct se_portal_group *
1738scsiback_make_tpg(struct se_wwn *wwn,
1739 struct config_group *group,
1740 const char *name)
1741{
1742 struct scsiback_tport *tport = container_of(wwn,
1743 struct scsiback_tport, tport_wwn);
1744
1745 struct scsiback_tpg *tpg;
495daef9 1746 u16 tpgt;
d9d660f6
JG		 1747 int ret;
1748
1749 if (strstr(name, "tpgt_") != name)
1750 return ERR_PTR(-EINVAL);
495daef9
DC		 1751 ret = kstrtou16(name + 5, 10, &tpgt);
1752 if (ret)
1753 return ERR_PTR(ret);
d9d660f6
JG		 1754
1755 tpg = kzalloc(sizeof(struct scsiback_tpg), GFP_KERNEL);
1756 if (!tpg)
1757 return ERR_PTR(-ENOMEM);
1758
1759 mutex_init(&tpg->tv_tpg_mutex);
1760 INIT_LIST_HEAD(&tpg->tv_tpg_list);
1761 INIT_LIST_HEAD(&tpg->info_list);
1762 tpg->tport = tport;
1763 tpg->tport_tpgt = tpgt;
1764
e4aae5af
CH		 1765 ret = core_tpg_register(&scsiback_ops, wwn, &tpg->se_tpg,
1766 tport->tport_proto_id);
d9d660f6
JG		 1767 if (ret < 0) {
1768 kfree(tpg);
1769 return NULL;
1770 }
1771 mutex_lock(&scsiback_mutex);
1772 list_add_tail(&tpg->tv_tpg_list, &scsiback_list);
1773 mutex_unlock(&scsiback_mutex);
1774
1775 return &tpg->se_tpg;
1776}
1777
1778static void scsiback_drop_tpg(struct se_portal_group *se_tpg)
1779{
1780 struct scsiback_tpg *tpg = container_of(se_tpg,
1781 struct scsiback_tpg, se_tpg);
1782
1783 mutex_lock(&scsiback_mutex);
1784 list_del(&tpg->tv_tpg_list);
1785 mutex_unlock(&scsiback_mutex);
1786 /*
1787 * Release the virtual I_T Nexus for this xen-pvscsi TPG
1788 */
1789 scsiback_drop_nexus(tpg);
1790 /*
78574878 1791 * Deregister the se_tpg from TCM.
d9d660f6
JG		 1792 */
1793 core_tpg_deregister(se_tpg);
1794 kfree(tpg);
1795}
1796
1797static int scsiback_check_true(struct se_portal_group *se_tpg)
1798{
1799 return 1;
1800}
1801
1802static int scsiback_check_false(struct se_portal_group *se_tpg)
1803{
1804 return 0;
1805}
1806
9ac8928e
CH		 1807static const struct target_core_fabric_ops scsiback_ops = {
1808 .module = THIS_MODULE,
1809 .name = "xen-pvscsi",
d9d660f6 1810 .get_fabric_name = scsiback_get_fabric_name,
d9d660f6
JG		 1811 .tpg_get_wwn = scsiback_get_fabric_wwn,
1812 .tpg_get_tag = scsiback_get_tag,
d9d660f6
JG		 1813 .tpg_check_demo_mode = scsiback_check_true,
1814 .tpg_check_demo_mode_cache = scsiback_check_true,
1815 .tpg_check_demo_mode_write_protect = scsiback_check_false,
1816 .tpg_check_prod_mode_write_protect = scsiback_check_false,
d9d660f6
JG		 1817 .tpg_get_inst_index = scsiback_tpg_get_inst_index,
1818 .check_stop_free = scsiback_check_stop_free,
1819 .release_cmd = scsiback_release_cmd,
d9d660f6
JG		 1820 .shutdown_session = scsiback_shutdown_session,
1821 .close_session = scsiback_close_session,
1822 .sess_get_index = scsiback_sess_get_index,
1823 .sess_get_initiator_sid = NULL,
1824 .write_pending = scsiback_write_pending,
1825 .write_pending_status = scsiback_write_pending_status,
1826 .set_default_node_attributes = scsiback_set_default_node_attrs,
d9d660f6
JG		 1827 .get_cmd_state = scsiback_get_cmd_state,
1828 .queue_data_in = scsiback_queue_data_in,
1829 .queue_status = scsiback_queue_status,
1830 .queue_tm_rsp = scsiback_queue_tm_rsp,
1831 .aborted_task = scsiback_aborted_task,
1832 /*
1833 * Setup callers for generic logic in target_core_fabric_configfs.c
1834 */
1835 .fabric_make_wwn = scsiback_make_tport,
1836 .fabric_drop_wwn = scsiback_drop_tport,
1837 .fabric_make_tpg = scsiback_make_tpg,
1838 .fabric_drop_tpg = scsiback_drop_tpg,
1839 .fabric_post_link = scsiback_port_link,
1840 .fabric_pre_unlink = scsiback_port_unlink,
d9d660f6 1841
9ac8928e
CH		 1842 .tfc_wwn_attrs = scsiback_wwn_attrs,
1843 .tfc_tpg_base_attrs = scsiback_tpg_attrs,
1844 .tfc_tpg_param_attrs = scsiback_param_attrs,
d9d660f6
JG		 1845};
1846
1847static const struct xenbus_device_id scsiback_ids[] = {
1848 { "vscsi" },
1849 { "" }
1850};
1851
95afae48
DV		 1852static struct xenbus_driver scsiback_driver = {
1853 .ids = scsiback_ids,
d9d660f6
JG		 1854 .probe = scsiback_probe,
1855 .remove = scsiback_remove,
1856 .otherend_changed = scsiback_frontend_changed
95afae48 1857};
d9d660f6
JG		 1858
1859static void scsiback_init_pend(void *p)
1860{
1861 struct vscsibk_pend *pend = p;
1862 int i;
1863
1864 memset(pend, 0, sizeof(*pend));
1865 for (i = 0; i < VSCSI_MAX_GRANTS; i++)
1866 pend->grant_handles[i] = SCSIBACK_INVALID_HANDLE;
1867}
1868
1869static int __init scsiback_init(void)
1870{
1871 int ret;
1872
1873 if (!xen_domain())
1874 return -ENODEV;
1875
9ac8928e
CH		 1876 pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n",
1877 VSCSI_VERSION, utsname()->sysname, utsname()->machine);
1878
d9d660f6
JG		 1879 scsiback_cachep = kmem_cache_create("vscsiif_cache",
1880 sizeof(struct vscsibk_pend), 0, 0, scsiback_init_pend);
1881 if (!scsiback_cachep)
1882 return -ENOMEM;
1883
1884 ret = xenbus_register_backend(&scsiback_driver);
1885 if (ret)
1886 goto out_cache_destroy;
1887
9ac8928e 1888 ret = target_register_template(&scsiback_ops);
d9d660f6
JG		 1889 if (ret)
1890 goto out_unregister_xenbus;
1891
1892 return 0;
1893
1894out_unregister_xenbus:
1895 xenbus_unregister_driver(&scsiback_driver);
1896out_cache_destroy:
1897 kmem_cache_destroy(scsiback_cachep);
78574878 1898 pr_err("%s: error %d\n", __func__, ret);
d9d660f6
JG		 1899 return ret;
1900}
1901
1902static void __exit scsiback_exit(void)
1903{
1904 struct page *page;
1905
1906 while (free_pages_num) {
1907 if (get_free_page(&page))
1908 BUG();
ff4b156f 1909 gnttab_free_pages(1, &page);
d9d660f6 1910 }
9ac8928e 1911 target_unregister_template(&scsiback_ops);
d9d660f6
JG		 1912 xenbus_unregister_driver(&scsiback_driver);
1913 kmem_cache_destroy(scsiback_cachep);
1914}
1915
1916module_init(scsiback_init);
1917module_exit(scsiback_exit);
1918
1919MODULE_DESCRIPTION("Xen SCSI backend driver");
1920MODULE_LICENSE("Dual BSD/GPL");
1921MODULE_ALIAS("xen-backend:vscsi");
1922MODULE_AUTHOR("Juergen Gross <jgross@suse.com>");
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