1 /* 2 * Xen SCSI backend driver 3 * 4 * Copyright (c) 2008, FUJITSU Limited 5 * 6 * Based on the blkback driver code. 7 * Adaption to kernel taget core infrastructure taken from vhost/scsi.c 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License version 2 11 * as published by the Free Software Foundation; or, when distributed 12 * separately from the Linux kernel or incorporated into other 13 * software packages, subject to the following license: 14 * 15 * Permission is hereby granted, free of charge, to any person obtaining a copy 16 * of this source file (the "Software"), to deal in the Software without 17 * restriction, including without limitation the rights to use, copy, modify, 18 * merge, publish, distribute, sublicense, and/or sell copies of the Software, 19 * and to permit persons to whom the Software is furnished to do so, subject to 20 * the following conditions: 21 * 22 * The above copyright notice and this permission notice shall be included in 23 * all copies or substantial portions of the Software. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 28 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 29 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 30 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 31 * IN THE SOFTWARE. 32 */ 33 34 #define pr_fmt(fmt) "xen-pvscsi: " fmt 35 36 #include <stdarg.h> 37 38 #include <linux/module.h> 39 #include <linux/utsname.h> 40 #include <linux/interrupt.h> 41 #include <linux/slab.h> 42 #include <linux/wait.h> 43 #include <linux/sched.h> 44 #include <linux/list.h> 45 #include <linux/gfp.h> 46 #include <linux/delay.h> 47 #include <linux/spinlock.h> 48 #include <linux/configfs.h> 49 50 #include <generated/utsrelease.h> 51 52 #include <scsi/scsi_host.h> /* SG_ALL */ 53 54 #include <target/target_core_base.h> 55 #include <target/target_core_fabric.h> 56 #include <target/target_core_configfs.h> 57 #include <target/target_core_fabric_configfs.h> 58 59 #include <asm/hypervisor.h> 60 61 #include <xen/xen.h> 62 #include <xen/balloon.h> 63 #include <xen/events.h> 64 #include <xen/xenbus.h> 65 #include <xen/grant_table.h> 66 #include <xen/page.h> 67 68 #include <xen/interface/grant_table.h> 69 #include <xen/interface/io/vscsiif.h> 70 71 #define VSCSI_VERSION "v0.1" 72 #define VSCSI_NAMELEN 32 73 74 struct ids_tuple { 75 unsigned int hst; /* host */ 76 unsigned int chn; /* channel */ 77 unsigned int tgt; /* target */ 78 unsigned int lun; /* LUN */ 79 }; 80 81 struct v2p_entry { 82 struct ids_tuple v; /* translate from */ 83 struct scsiback_tpg *tpg; /* translate to */ 84 unsigned int lun; 85 struct kref kref; 86 struct list_head l; 87 }; 88 89 struct vscsibk_info { 90 struct xenbus_device *dev; 91 92 domid_t domid; 93 unsigned int irq; 94 95 struct vscsiif_back_ring ring; 96 int ring_error; 97 98 spinlock_t ring_lock; 99 atomic_t nr_unreplied_reqs; 100 101 spinlock_t v2p_lock; 102 struct list_head v2p_entry_lists; 103 104 wait_queue_head_t waiting_to_free; 105 }; 106 107 /* theoretical maximum of grants for one request */ 108 #define VSCSI_MAX_GRANTS (SG_ALL + VSCSIIF_SG_TABLESIZE) 109 110 /* 111 * VSCSI_GRANT_BATCH is the maximum number of grants to be processed in one 112 * call to map/unmap grants. Don't choose it too large, as there are arrays 113 * with VSCSI_GRANT_BATCH elements allocated on the stack. 114 */ 115 #define VSCSI_GRANT_BATCH 16 116 117 struct vscsibk_pend { 118 uint16_t rqid; 119 120 uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE]; 121 uint8_t cmd_len; 122 123 uint8_t sc_data_direction; 124 uint16_t n_sg; /* real length of SG list */ 125 uint16_t n_grants; /* SG pages and potentially SG list */ 126 uint32_t data_len; 127 uint32_t result; 128 129 struct vscsibk_info *info; 130 struct v2p_entry *v2p; 131 struct scatterlist *sgl; 132 133 uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE]; 134 135 grant_handle_t grant_handles[VSCSI_MAX_GRANTS]; 136 struct page *pages[VSCSI_MAX_GRANTS]; 137 138 struct se_cmd se_cmd; 139 }; 140 141 struct scsiback_tmr { 142 atomic_t tmr_complete; 143 wait_queue_head_t tmr_wait; 144 }; 145 146 struct scsiback_nexus { 147 /* Pointer to TCM session for I_T Nexus */ 148 struct se_session *tvn_se_sess; 149 }; 150 151 struct scsiback_tport { 152 /* SCSI protocol the tport is providing */ 153 u8 tport_proto_id; 154 /* Binary World Wide unique Port Name for pvscsi Target port */ 155 u64 tport_wwpn; 156 /* ASCII formatted WWPN for pvscsi Target port */ 157 char tport_name[VSCSI_NAMELEN]; 158 /* Returned by scsiback_make_tport() */ 159 struct se_wwn tport_wwn; 160 }; 161 162 struct scsiback_tpg { 163 /* scsiback port target portal group tag for TCM */ 164 u16 tport_tpgt; 165 /* track number of TPG Port/Lun Links wrt explicit I_T Nexus shutdown */ 166 int tv_tpg_port_count; 167 /* xen-pvscsi references to tpg_nexus, protected by tv_tpg_mutex */ 168 int tv_tpg_fe_count; 169 /* list for scsiback_list */ 170 struct list_head tv_tpg_list; 171 /* Used to protect access for tpg_nexus */ 172 struct mutex tv_tpg_mutex; 173 /* Pointer to the TCM pvscsi I_T Nexus for this TPG endpoint */ 174 struct scsiback_nexus *tpg_nexus; 175 /* Pointer back to scsiback_tport */ 176 struct scsiback_tport *tport; 177 /* Returned by scsiback_make_tpg() */ 178 struct se_portal_group se_tpg; 179 /* alias used in xenstore */ 180 char param_alias[VSCSI_NAMELEN]; 181 /* list of info structures related to this target portal group */ 182 struct list_head info_list; 183 }; 184 185 #define SCSIBACK_INVALID_HANDLE (~0) 186 187 static bool log_print_stat; 188 module_param(log_print_stat, bool, 0644); 189 190 static int scsiback_max_buffer_pages = 1024; 191 module_param_named(max_buffer_pages, scsiback_max_buffer_pages, int, 0644); 192 MODULE_PARM_DESC(max_buffer_pages, 193 "Maximum number of free pages to keep in backend buffer"); 194 195 static struct kmem_cache *scsiback_cachep; 196 static DEFINE_SPINLOCK(free_pages_lock); 197 static int free_pages_num; 198 static LIST_HEAD(scsiback_free_pages); 199 200 /* Global spinlock to protect scsiback TPG list */ 201 static DEFINE_MUTEX(scsiback_mutex); 202 static LIST_HEAD(scsiback_list); 203 204 static const struct target_core_fabric_ops scsiback_ops; 205 206 static void scsiback_get(struct vscsibk_info *info) 207 { 208 atomic_inc(&info->nr_unreplied_reqs); 209 } 210 211 static void scsiback_put(struct vscsibk_info *info) 212 { 213 if (atomic_dec_and_test(&info->nr_unreplied_reqs)) 214 wake_up(&info->waiting_to_free); 215 } 216 217 static void put_free_pages(struct page **page, int num) 218 { 219 unsigned long flags; 220 int i = free_pages_num + num, n = num; 221 222 if (num == 0) 223 return; 224 if (i > scsiback_max_buffer_pages) { 225 n = min(num, i - scsiback_max_buffer_pages); 226 gnttab_free_pages(n, page + num - n); 227 n = num - n; 228 } 229 spin_lock_irqsave(&free_pages_lock, flags); 230 for (i = 0; i < n; i++) 231 list_add(&page[i]->lru, &scsiback_free_pages); 232 free_pages_num += n; 233 spin_unlock_irqrestore(&free_pages_lock, flags); 234 } 235 236 static int get_free_page(struct page **page) 237 { 238 unsigned long flags; 239 240 spin_lock_irqsave(&free_pages_lock, flags); 241 if (list_empty(&scsiback_free_pages)) { 242 spin_unlock_irqrestore(&free_pages_lock, flags); 243 return gnttab_alloc_pages(1, page); 244 } 245 page[0] = list_first_entry(&scsiback_free_pages, struct page, lru); 246 list_del(&page[0]->lru); 247 free_pages_num--; 248 spin_unlock_irqrestore(&free_pages_lock, flags); 249 return 0; 250 } 251 252 static unsigned long vaddr_page(struct page *page) 253 { 254 unsigned long pfn = page_to_pfn(page); 255 256 return (unsigned long)pfn_to_kaddr(pfn); 257 } 258 259 static unsigned long vaddr(struct vscsibk_pend *req, int seg) 260 { 261 return vaddr_page(req->pages[seg]); 262 } 263 264 static void scsiback_print_status(char *sense_buffer, int errors, 265 struct vscsibk_pend *pending_req) 266 { 267 struct scsiback_tpg *tpg = pending_req->v2p->tpg; 268 269 pr_err("[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n", 270 tpg->tport->tport_name, pending_req->v2p->lun, 271 pending_req->cmnd[0], status_byte(errors), msg_byte(errors), 272 host_byte(errors), driver_byte(errors)); 273 } 274 275 static void scsiback_fast_flush_area(struct vscsibk_pend *req) 276 { 277 struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH]; 278 struct page *pages[VSCSI_GRANT_BATCH]; 279 unsigned int i, invcount = 0; 280 grant_handle_t handle; 281 int err; 282 283 kfree(req->sgl); 284 req->sgl = NULL; 285 req->n_sg = 0; 286 287 if (!req->n_grants) 288 return; 289 290 for (i = 0; i < req->n_grants; i++) { 291 handle = req->grant_handles[i]; 292 if (handle == SCSIBACK_INVALID_HANDLE) 293 continue; 294 gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i), 295 GNTMAP_host_map, handle); 296 req->grant_handles[i] = SCSIBACK_INVALID_HANDLE; 297 pages[invcount] = req->pages[i]; 298 put_page(pages[invcount]); 299 invcount++; 300 if (invcount < VSCSI_GRANT_BATCH) 301 continue; 302 err = gnttab_unmap_refs(unmap, NULL, pages, invcount); 303 BUG_ON(err); 304 invcount = 0; 305 } 306 307 if (invcount) { 308 err = gnttab_unmap_refs(unmap, NULL, pages, invcount); 309 BUG_ON(err); 310 } 311 312 put_free_pages(req->pages, req->n_grants); 313 req->n_grants = 0; 314 } 315 316 static void scsiback_free_translation_entry(struct kref *kref) 317 { 318 struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref); 319 struct scsiback_tpg *tpg = entry->tpg; 320 321 mutex_lock(&tpg->tv_tpg_mutex); 322 tpg->tv_tpg_fe_count--; 323 mutex_unlock(&tpg->tv_tpg_mutex); 324 325 kfree(entry); 326 } 327 328 static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result, 329 uint32_t resid, struct vscsibk_pend *pending_req) 330 { 331 struct vscsiif_response *ring_res; 332 struct vscsibk_info *info = pending_req->info; 333 int notify; 334 struct scsi_sense_hdr sshdr; 335 unsigned long flags; 336 unsigned len; 337 338 spin_lock_irqsave(&info->ring_lock, flags); 339 340 ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt); 341 info->ring.rsp_prod_pvt++; 342 343 ring_res->rslt = result; 344 ring_res->rqid = pending_req->rqid; 345 346 if (sense_buffer != NULL && 347 scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE, 348 &sshdr)) { 349 len = min_t(unsigned, 8 + sense_buffer[7], 350 VSCSIIF_SENSE_BUFFERSIZE); 351 memcpy(ring_res->sense_buffer, sense_buffer, len); 352 ring_res->sense_len = len; 353 } else { 354 ring_res->sense_len = 0; 355 } 356 357 ring_res->residual_len = resid; 358 359 RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify); 360 spin_unlock_irqrestore(&info->ring_lock, flags); 361 362 if (notify) 363 notify_remote_via_irq(info->irq); 364 365 if (pending_req->v2p) 366 kref_put(&pending_req->v2p->kref, 367 scsiback_free_translation_entry); 368 } 369 370 static void scsiback_cmd_done(struct vscsibk_pend *pending_req) 371 { 372 struct vscsibk_info *info = pending_req->info; 373 unsigned char *sense_buffer; 374 unsigned int resid; 375 int errors; 376 377 sense_buffer = pending_req->sense_buffer; 378 resid = pending_req->se_cmd.residual_count; 379 errors = pending_req->result; 380 381 if (errors && log_print_stat) 382 scsiback_print_status(sense_buffer, errors, pending_req); 383 384 scsiback_fast_flush_area(pending_req); 385 scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req); 386 scsiback_put(info); 387 } 388 389 static void scsiback_cmd_exec(struct vscsibk_pend *pending_req) 390 { 391 struct se_cmd *se_cmd = &pending_req->se_cmd; 392 struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess; 393 int rc; 394 395 memset(pending_req->sense_buffer, 0, VSCSIIF_SENSE_BUFFERSIZE); 396 397 memset(se_cmd, 0, sizeof(*se_cmd)); 398 399 scsiback_get(pending_req->info); 400 rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd, 401 pending_req->sense_buffer, pending_req->v2p->lun, 402 pending_req->data_len, 0, 403 pending_req->sc_data_direction, 0, 404 pending_req->sgl, pending_req->n_sg, 405 NULL, 0, NULL, 0); 406 if (rc < 0) { 407 transport_send_check_condition_and_sense(se_cmd, 408 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); 409 transport_generic_free_cmd(se_cmd, 0); 410 } 411 } 412 413 static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map, 414 struct page **pg, grant_handle_t *grant, int cnt) 415 { 416 int err, i; 417 418 if (!cnt) 419 return 0; 420 421 err = gnttab_map_refs(map, NULL, pg, cnt); 422 BUG_ON(err); 423 for (i = 0; i < cnt; i++) { 424 if (unlikely(map[i].status != GNTST_okay)) { 425 pr_err("invalid buffer -- could not remap it\n"); 426 map[i].handle = SCSIBACK_INVALID_HANDLE; 427 err = -ENOMEM; 428 } else { 429 get_page(pg[i]); 430 } 431 grant[i] = map[i].handle; 432 } 433 return err; 434 } 435 436 static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req, 437 struct scsiif_request_segment *seg, struct page **pg, 438 grant_handle_t *grant, int cnt, u32 flags) 439 { 440 int mapcount = 0, i, err = 0; 441 struct gnttab_map_grant_ref map[VSCSI_GRANT_BATCH]; 442 struct vscsibk_info *info = pending_req->info; 443 444 for (i = 0; i < cnt; i++) { 445 if (get_free_page(pg + mapcount)) { 446 put_free_pages(pg, mapcount); 447 pr_err("no grant page\n"); 448 return -ENOMEM; 449 } 450 gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]), 451 flags, seg[i].gref, info->domid); 452 mapcount++; 453 if (mapcount < VSCSI_GRANT_BATCH) 454 continue; 455 err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); 456 pg += mapcount; 457 grant += mapcount; 458 pending_req->n_grants += mapcount; 459 if (err) 460 return err; 461 mapcount = 0; 462 } 463 err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); 464 pending_req->n_grants += mapcount; 465 return err; 466 } 467 468 static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req, 469 struct vscsibk_pend *pending_req) 470 { 471 u32 flags; 472 int i, err, n_segs, i_seg = 0; 473 struct page **pg; 474 struct scsiif_request_segment *seg; 475 unsigned long end_seg = 0; 476 unsigned int nr_segments = (unsigned int)ring_req->nr_segments; 477 unsigned int nr_sgl = 0; 478 struct scatterlist *sg; 479 grant_handle_t *grant; 480 481 pending_req->n_sg = 0; 482 pending_req->n_grants = 0; 483 pending_req->data_len = 0; 484 485 nr_segments &= ~VSCSIIF_SG_GRANT; 486 if (!nr_segments) 487 return 0; 488 489 if (nr_segments > VSCSIIF_SG_TABLESIZE) { 490 pr_debug("invalid parameter nr_seg = %d\n", 491 ring_req->nr_segments); 492 return -EINVAL; 493 } 494 495 if (ring_req->nr_segments & VSCSIIF_SG_GRANT) { 496 err = scsiback_gnttab_data_map_list(pending_req, ring_req->seg, 497 pending_req->pages, pending_req->grant_handles, 498 nr_segments, GNTMAP_host_map | GNTMAP_readonly); 499 if (err) 500 return err; 501 nr_sgl = nr_segments; 502 nr_segments = 0; 503 for (i = 0; i < nr_sgl; i++) { 504 n_segs = ring_req->seg[i].length / 505 sizeof(struct scsiif_request_segment); 506 if ((unsigned)ring_req->seg[i].offset + 507 (unsigned)ring_req->seg[i].length > PAGE_SIZE || 508 n_segs * sizeof(struct scsiif_request_segment) != 509 ring_req->seg[i].length) 510 return -EINVAL; 511 nr_segments += n_segs; 512 } 513 if (nr_segments > SG_ALL) { 514 pr_debug("invalid nr_seg = %d\n", nr_segments); 515 return -EINVAL; 516 } 517 } 518 519 /* free of (sgl) in fast_flush_area() */ 520 pending_req->sgl = kmalloc_array(nr_segments, 521 sizeof(struct scatterlist), GFP_KERNEL); 522 if (!pending_req->sgl) 523 return -ENOMEM; 524 525 sg_init_table(pending_req->sgl, nr_segments); 526 pending_req->n_sg = nr_segments; 527 528 flags = GNTMAP_host_map; 529 if (pending_req->sc_data_direction == DMA_TO_DEVICE) 530 flags |= GNTMAP_readonly; 531 532 pg = pending_req->pages + nr_sgl; 533 grant = pending_req->grant_handles + nr_sgl; 534 if (!nr_sgl) { 535 seg = ring_req->seg; 536 err = scsiback_gnttab_data_map_list(pending_req, seg, 537 pg, grant, nr_segments, flags); 538 if (err) 539 return err; 540 } else { 541 for (i = 0; i < nr_sgl; i++) { 542 seg = (struct scsiif_request_segment *)( 543 vaddr(pending_req, i) + ring_req->seg[i].offset); 544 n_segs = ring_req->seg[i].length / 545 sizeof(struct scsiif_request_segment); 546 err = scsiback_gnttab_data_map_list(pending_req, seg, 547 pg, grant, n_segs, flags); 548 if (err) 549 return err; 550 pg += n_segs; 551 grant += n_segs; 552 } 553 end_seg = vaddr(pending_req, 0) + ring_req->seg[0].offset; 554 seg = (struct scsiif_request_segment *)end_seg; 555 end_seg += ring_req->seg[0].length; 556 pg = pending_req->pages + nr_sgl; 557 } 558 559 for_each_sg(pending_req->sgl, sg, nr_segments, i) { 560 sg_set_page(sg, pg[i], seg->length, seg->offset); 561 pending_req->data_len += seg->length; 562 seg++; 563 if (nr_sgl && (unsigned long)seg >= end_seg) { 564 i_seg++; 565 end_seg = vaddr(pending_req, i_seg) + 566 ring_req->seg[i_seg].offset; 567 seg = (struct scsiif_request_segment *)end_seg; 568 end_seg += ring_req->seg[i_seg].length; 569 } 570 if (sg->offset >= PAGE_SIZE || 571 sg->length > PAGE_SIZE || 572 sg->offset + sg->length > PAGE_SIZE) 573 return -EINVAL; 574 } 575 576 return 0; 577 } 578 579 static void scsiback_disconnect(struct vscsibk_info *info) 580 { 581 wait_event(info->waiting_to_free, 582 atomic_read(&info->nr_unreplied_reqs) == 0); 583 584 unbind_from_irqhandler(info->irq, info); 585 info->irq = 0; 586 xenbus_unmap_ring_vfree(info->dev, info->ring.sring); 587 } 588 589 static void scsiback_device_action(struct vscsibk_pend *pending_req, 590 enum tcm_tmreq_table act, int tag) 591 { 592 int rc, err = FAILED; 593 struct scsiback_tpg *tpg = pending_req->v2p->tpg; 594 struct se_cmd *se_cmd = &pending_req->se_cmd; 595 struct scsiback_tmr *tmr; 596 597 tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL); 598 if (!tmr) 599 goto out; 600 601 init_waitqueue_head(&tmr->tmr_wait); 602 603 transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo, 604 tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, TCM_SIMPLE_TAG, 605 &pending_req->sense_buffer[0]); 606 607 rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL); 608 if (rc < 0) 609 goto out; 610 611 se_cmd->se_tmr_req->ref_task_tag = tag; 612 613 if (transport_lookup_tmr_lun(se_cmd, pending_req->v2p->lun) < 0) 614 goto out; 615 616 transport_generic_handle_tmr(se_cmd); 617 wait_event(tmr->tmr_wait, atomic_read(&tmr->tmr_complete)); 618 619 err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? 620 SUCCESS : FAILED; 621 622 out: 623 if (tmr) { 624 transport_generic_free_cmd(&pending_req->se_cmd, 1); 625 kfree(tmr); 626 } 627 628 scsiback_do_resp_with_sense(NULL, err, 0, pending_req); 629 630 kmem_cache_free(scsiback_cachep, pending_req); 631 } 632 633 /* 634 Perform virtual to physical translation 635 */ 636 static struct v2p_entry *scsiback_do_translation(struct vscsibk_info *info, 637 struct ids_tuple *v) 638 { 639 struct v2p_entry *entry; 640 struct list_head *head = &(info->v2p_entry_lists); 641 unsigned long flags; 642 643 spin_lock_irqsave(&info->v2p_lock, flags); 644 list_for_each_entry(entry, head, l) { 645 if ((entry->v.chn == v->chn) && 646 (entry->v.tgt == v->tgt) && 647 (entry->v.lun == v->lun)) { 648 kref_get(&entry->kref); 649 goto out; 650 } 651 } 652 entry = NULL; 653 654 out: 655 spin_unlock_irqrestore(&info->v2p_lock, flags); 656 return entry; 657 } 658 659 static int prepare_pending_reqs(struct vscsibk_info *info, 660 struct vscsiif_request *ring_req, 661 struct vscsibk_pend *pending_req) 662 { 663 struct v2p_entry *v2p; 664 struct ids_tuple vir; 665 666 pending_req->rqid = ring_req->rqid; 667 pending_req->info = info; 668 669 vir.chn = ring_req->channel; 670 vir.tgt = ring_req->id; 671 vir.lun = ring_req->lun; 672 673 v2p = scsiback_do_translation(info, &vir); 674 if (!v2p) { 675 pending_req->v2p = NULL; 676 pr_debug("the v2p of (chn:%d, tgt:%d, lun:%d) doesn't exist.\n", 677 vir.chn, vir.tgt, vir.lun); 678 return -ENODEV; 679 } 680 pending_req->v2p = v2p; 681 682 /* request range check from frontend */ 683 pending_req->sc_data_direction = ring_req->sc_data_direction; 684 if ((pending_req->sc_data_direction != DMA_BIDIRECTIONAL) && 685 (pending_req->sc_data_direction != DMA_TO_DEVICE) && 686 (pending_req->sc_data_direction != DMA_FROM_DEVICE) && 687 (pending_req->sc_data_direction != DMA_NONE)) { 688 pr_debug("invalid parameter data_dir = %d\n", 689 pending_req->sc_data_direction); 690 return -EINVAL; 691 } 692 693 pending_req->cmd_len = ring_req->cmd_len; 694 if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) { 695 pr_debug("invalid parameter cmd_len = %d\n", 696 pending_req->cmd_len); 697 return -EINVAL; 698 } 699 memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len); 700 701 return 0; 702 } 703 704 static int scsiback_do_cmd_fn(struct vscsibk_info *info) 705 { 706 struct vscsiif_back_ring *ring = &info->ring; 707 struct vscsiif_request ring_req; 708 struct vscsibk_pend *pending_req; 709 RING_IDX rc, rp; 710 int err, more_to_do; 711 uint32_t result; 712 713 rc = ring->req_cons; 714 rp = ring->sring->req_prod; 715 rmb(); /* guest system is accessing ring, too */ 716 717 if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) { 718 rc = ring->rsp_prod_pvt; 719 pr_warn("Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n", 720 info->domid, rp, rc, rp - rc); 721 info->ring_error = 1; 722 return 0; 723 } 724 725 while ((rc != rp)) { 726 if (RING_REQUEST_CONS_OVERFLOW(ring, rc)) 727 break; 728 pending_req = kmem_cache_alloc(scsiback_cachep, GFP_KERNEL); 729 if (!pending_req) 730 return 1; 731 732 ring_req = *RING_GET_REQUEST(ring, rc); 733 ring->req_cons = ++rc; 734 735 err = prepare_pending_reqs(info, &ring_req, pending_req); 736 if (err) { 737 switch (err) { 738 case -ENODEV: 739 result = DID_NO_CONNECT; 740 break; 741 default: 742 result = DRIVER_ERROR; 743 break; 744 } 745 scsiback_do_resp_with_sense(NULL, result << 24, 0, 746 pending_req); 747 kmem_cache_free(scsiback_cachep, pending_req); 748 return 1; 749 } 750 751 switch (ring_req.act) { 752 case VSCSIIF_ACT_SCSI_CDB: 753 if (scsiback_gnttab_data_map(&ring_req, pending_req)) { 754 scsiback_fast_flush_area(pending_req); 755 scsiback_do_resp_with_sense(NULL, 756 DRIVER_ERROR << 24, 0, pending_req); 757 kmem_cache_free(scsiback_cachep, pending_req); 758 } else { 759 scsiback_cmd_exec(pending_req); 760 } 761 break; 762 case VSCSIIF_ACT_SCSI_ABORT: 763 scsiback_device_action(pending_req, TMR_ABORT_TASK, 764 ring_req.ref_rqid); 765 break; 766 case VSCSIIF_ACT_SCSI_RESET: 767 scsiback_device_action(pending_req, TMR_LUN_RESET, 0); 768 break; 769 default: 770 pr_err_ratelimited("invalid request\n"); 771 scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24, 772 0, pending_req); 773 kmem_cache_free(scsiback_cachep, pending_req); 774 break; 775 } 776 777 /* Yield point for this unbounded loop. */ 778 cond_resched(); 779 } 780 781 RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do); 782 return more_to_do; 783 } 784 785 static irqreturn_t scsiback_irq_fn(int irq, void *dev_id) 786 { 787 struct vscsibk_info *info = dev_id; 788 789 if (info->ring_error) 790 return IRQ_HANDLED; 791 792 while (scsiback_do_cmd_fn(info)) 793 cond_resched(); 794 795 return IRQ_HANDLED; 796 } 797 798 static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref, 799 evtchn_port_t evtchn) 800 { 801 void *area; 802 struct vscsiif_sring *sring; 803 int err; 804 805 if (info->irq) 806 return -1; 807 808 err = xenbus_map_ring_valloc(info->dev, &ring_ref, 1, &area); 809 if (err) 810 return err; 811 812 sring = (struct vscsiif_sring *)area; 813 BACK_RING_INIT(&info->ring, sring, PAGE_SIZE); 814 815 err = bind_interdomain_evtchn_to_irq(info->domid, evtchn); 816 if (err < 0) 817 goto unmap_page; 818 819 info->irq = err; 820 821 err = request_threaded_irq(info->irq, NULL, scsiback_irq_fn, 822 IRQF_ONESHOT, "vscsiif-backend", info); 823 if (err) 824 goto free_irq; 825 826 return 0; 827 828 free_irq: 829 unbind_from_irqhandler(info->irq, info); 830 info->irq = 0; 831 unmap_page: 832 xenbus_unmap_ring_vfree(info->dev, area); 833 834 return err; 835 } 836 837 static int scsiback_map(struct vscsibk_info *info) 838 { 839 struct xenbus_device *dev = info->dev; 840 unsigned int ring_ref, evtchn; 841 int err; 842 843 err = xenbus_gather(XBT_NIL, dev->otherend, 844 "ring-ref", "%u", &ring_ref, 845 "event-channel", "%u", &evtchn, NULL); 846 if (err) { 847 xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend); 848 return err; 849 } 850 851 return scsiback_init_sring(info, ring_ref, evtchn); 852 } 853 854 /* 855 Add a new translation entry 856 */ 857 static int scsiback_add_translation_entry(struct vscsibk_info *info, 858 char *phy, struct ids_tuple *v) 859 { 860 int err = 0; 861 struct v2p_entry *entry; 862 struct v2p_entry *new; 863 struct list_head *head = &(info->v2p_entry_lists); 864 unsigned long flags; 865 char *lunp; 866 unsigned int lun; 867 struct scsiback_tpg *tpg_entry, *tpg = NULL; 868 char *error = "doesn't exist"; 869 870 lunp = strrchr(phy, ':'); 871 if (!lunp) { 872 pr_err("illegal format of physical device %s\n", phy); 873 return -EINVAL; 874 } 875 *lunp = 0; 876 lunp++; 877 if (kstrtouint(lunp, 10, &lun) || lun >= TRANSPORT_MAX_LUNS_PER_TPG) { 878 pr_err("lun number not valid: %s\n", lunp); 879 return -EINVAL; 880 } 881 882 mutex_lock(&scsiback_mutex); 883 list_for_each_entry(tpg_entry, &scsiback_list, tv_tpg_list) { 884 if (!strcmp(phy, tpg_entry->tport->tport_name) || 885 !strcmp(phy, tpg_entry->param_alias)) { 886 spin_lock(&tpg_entry->se_tpg.tpg_lun_lock); 887 if (tpg_entry->se_tpg.tpg_lun_list[lun]->lun_status == 888 TRANSPORT_LUN_STATUS_ACTIVE) { 889 if (!tpg_entry->tpg_nexus) 890 error = "nexus undefined"; 891 else 892 tpg = tpg_entry; 893 } 894 spin_unlock(&tpg_entry->se_tpg.tpg_lun_lock); 895 break; 896 } 897 } 898 if (tpg) { 899 mutex_lock(&tpg->tv_tpg_mutex); 900 tpg->tv_tpg_fe_count++; 901 mutex_unlock(&tpg->tv_tpg_mutex); 902 } 903 mutex_unlock(&scsiback_mutex); 904 905 if (!tpg) { 906 pr_err("%s:%d %s\n", phy, lun, error); 907 return -ENODEV; 908 } 909 910 new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL); 911 if (new == NULL) { 912 err = -ENOMEM; 913 goto out_free; 914 } 915 916 spin_lock_irqsave(&info->v2p_lock, flags); 917 918 /* Check double assignment to identical virtual ID */ 919 list_for_each_entry(entry, head, l) { 920 if ((entry->v.chn == v->chn) && 921 (entry->v.tgt == v->tgt) && 922 (entry->v.lun == v->lun)) { 923 pr_warn("Virtual ID is already used. Assignment was not performed.\n"); 924 err = -EEXIST; 925 goto out; 926 } 927 928 } 929 930 /* Create a new translation entry and add to the list */ 931 kref_init(&new->kref); 932 new->v = *v; 933 new->tpg = tpg; 934 new->lun = lun; 935 list_add_tail(&new->l, head); 936 937 out: 938 spin_unlock_irqrestore(&info->v2p_lock, flags); 939 940 out_free: 941 mutex_lock(&tpg->tv_tpg_mutex); 942 tpg->tv_tpg_fe_count--; 943 mutex_unlock(&tpg->tv_tpg_mutex); 944 945 if (err) 946 kfree(new); 947 948 return err; 949 } 950 951 static void __scsiback_del_translation_entry(struct v2p_entry *entry) 952 { 953 list_del(&entry->l); 954 kref_put(&entry->kref, scsiback_free_translation_entry); 955 } 956 957 /* 958 Delete the translation entry specfied 959 */ 960 static int scsiback_del_translation_entry(struct vscsibk_info *info, 961 struct ids_tuple *v) 962 { 963 struct v2p_entry *entry; 964 struct list_head *head = &(info->v2p_entry_lists); 965 unsigned long flags; 966 967 spin_lock_irqsave(&info->v2p_lock, flags); 968 /* Find out the translation entry specified */ 969 list_for_each_entry(entry, head, l) { 970 if ((entry->v.chn == v->chn) && 971 (entry->v.tgt == v->tgt) && 972 (entry->v.lun == v->lun)) { 973 goto found; 974 } 975 } 976 977 spin_unlock_irqrestore(&info->v2p_lock, flags); 978 return 1; 979 980 found: 981 /* Delete the translation entry specfied */ 982 __scsiback_del_translation_entry(entry); 983 984 spin_unlock_irqrestore(&info->v2p_lock, flags); 985 return 0; 986 } 987 988 static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state, 989 char *phy, struct ids_tuple *vir, int try) 990 { 991 if (!scsiback_add_translation_entry(info, phy, vir)) { 992 if (xenbus_printf(XBT_NIL, info->dev->nodename, state, 993 "%d", XenbusStateInitialised)) { 994 pr_err("xenbus_printf error %s\n", state); 995 scsiback_del_translation_entry(info, vir); 996 } 997 } else if (!try) { 998 xenbus_printf(XBT_NIL, info->dev->nodename, state, 999 "%d", XenbusStateClosed); 1000 } 1001 } 1002 1003 static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state, 1004 struct ids_tuple *vir) 1005 { 1006 if (!scsiback_del_translation_entry(info, vir)) { 1007 if (xenbus_printf(XBT_NIL, info->dev->nodename, state, 1008 "%d", XenbusStateClosed)) 1009 pr_err("xenbus_printf error %s\n", state); 1010 } 1011 } 1012 1013 #define VSCSIBACK_OP_ADD_OR_DEL_LUN 1 1014 #define VSCSIBACK_OP_UPDATEDEV_STATE 2 1015 1016 static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op, 1017 char *ent) 1018 { 1019 int err; 1020 struct ids_tuple vir; 1021 char *val; 1022 int device_state; 1023 char phy[VSCSI_NAMELEN]; 1024 char str[64]; 1025 char state[64]; 1026 struct xenbus_device *dev = info->dev; 1027 1028 /* read status */ 1029 snprintf(state, sizeof(state), "vscsi-devs/%s/state", ent); 1030 err = xenbus_scanf(XBT_NIL, dev->nodename, state, "%u", &device_state); 1031 if (XENBUS_EXIST_ERR(err)) 1032 return; 1033 1034 /* physical SCSI device */ 1035 snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent); 1036 val = xenbus_read(XBT_NIL, dev->nodename, str, NULL); 1037 if (IS_ERR(val)) { 1038 xenbus_printf(XBT_NIL, dev->nodename, state, 1039 "%d", XenbusStateClosed); 1040 return; 1041 } 1042 strlcpy(phy, val, VSCSI_NAMELEN); 1043 kfree(val); 1044 1045 /* virtual SCSI device */ 1046 snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", ent); 1047 err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u", 1048 &vir.hst, &vir.chn, &vir.tgt, &vir.lun); 1049 if (XENBUS_EXIST_ERR(err)) { 1050 xenbus_printf(XBT_NIL, dev->nodename, state, 1051 "%d", XenbusStateClosed); 1052 return; 1053 } 1054 1055 switch (op) { 1056 case VSCSIBACK_OP_ADD_OR_DEL_LUN: 1057 switch (device_state) { 1058 case XenbusStateInitialising: 1059 scsiback_do_add_lun(info, state, phy, &vir, 0); 1060 break; 1061 case XenbusStateConnected: 1062 scsiback_do_add_lun(info, state, phy, &vir, 1); 1063 break; 1064 case XenbusStateClosing: 1065 scsiback_do_del_lun(info, state, &vir); 1066 break; 1067 default: 1068 break; 1069 } 1070 break; 1071 1072 case VSCSIBACK_OP_UPDATEDEV_STATE: 1073 if (device_state == XenbusStateInitialised) { 1074 /* modify vscsi-devs/dev-x/state */ 1075 if (xenbus_printf(XBT_NIL, dev->nodename, state, 1076 "%d", XenbusStateConnected)) { 1077 pr_err("xenbus_printf error %s\n", str); 1078 scsiback_del_translation_entry(info, &vir); 1079 xenbus_printf(XBT_NIL, dev->nodename, state, 1080 "%d", XenbusStateClosed); 1081 } 1082 } 1083 break; 1084 /* When it is necessary, processing is added here. */ 1085 default: 1086 break; 1087 } 1088 } 1089 1090 static void scsiback_do_lun_hotplug(struct vscsibk_info *info, int op) 1091 { 1092 int i; 1093 char **dir; 1094 unsigned int ndir = 0; 1095 1096 dir = xenbus_directory(XBT_NIL, info->dev->nodename, "vscsi-devs", 1097 &ndir); 1098 if (IS_ERR(dir)) 1099 return; 1100 1101 for (i = 0; i < ndir; i++) 1102 scsiback_do_1lun_hotplug(info, op, dir[i]); 1103 1104 kfree(dir); 1105 } 1106 1107 static void scsiback_frontend_changed(struct xenbus_device *dev, 1108 enum xenbus_state frontend_state) 1109 { 1110 struct vscsibk_info *info = dev_get_drvdata(&dev->dev); 1111 1112 switch (frontend_state) { 1113 case XenbusStateInitialising: 1114 break; 1115 1116 case XenbusStateInitialised: 1117 if (scsiback_map(info)) 1118 break; 1119 1120 scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); 1121 xenbus_switch_state(dev, XenbusStateConnected); 1122 break; 1123 1124 case XenbusStateConnected: 1125 scsiback_do_lun_hotplug(info, VSCSIBACK_OP_UPDATEDEV_STATE); 1126 1127 if (dev->state == XenbusStateConnected) 1128 break; 1129 1130 xenbus_switch_state(dev, XenbusStateConnected); 1131 break; 1132 1133 case XenbusStateClosing: 1134 if (info->irq) 1135 scsiback_disconnect(info); 1136 1137 xenbus_switch_state(dev, XenbusStateClosing); 1138 break; 1139 1140 case XenbusStateClosed: 1141 xenbus_switch_state(dev, XenbusStateClosed); 1142 if (xenbus_dev_is_online(dev)) 1143 break; 1144 /* fall through if not online */ 1145 case XenbusStateUnknown: 1146 device_unregister(&dev->dev); 1147 break; 1148 1149 case XenbusStateReconfiguring: 1150 scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); 1151 xenbus_switch_state(dev, XenbusStateReconfigured); 1152 1153 break; 1154 1155 default: 1156 xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", 1157 frontend_state); 1158 break; 1159 } 1160 } 1161 1162 /* 1163 Release the translation entry specfied 1164 */ 1165 static void scsiback_release_translation_entry(struct vscsibk_info *info) 1166 { 1167 struct v2p_entry *entry, *tmp; 1168 struct list_head *head = &(info->v2p_entry_lists); 1169 unsigned long flags; 1170 1171 spin_lock_irqsave(&info->v2p_lock, flags); 1172 1173 list_for_each_entry_safe(entry, tmp, head, l) 1174 __scsiback_del_translation_entry(entry); 1175 1176 spin_unlock_irqrestore(&info->v2p_lock, flags); 1177 } 1178 1179 static int scsiback_remove(struct xenbus_device *dev) 1180 { 1181 struct vscsibk_info *info = dev_get_drvdata(&dev->dev); 1182 1183 if (info->irq) 1184 scsiback_disconnect(info); 1185 1186 scsiback_release_translation_entry(info); 1187 1188 dev_set_drvdata(&dev->dev, NULL); 1189 1190 return 0; 1191 } 1192 1193 static int scsiback_probe(struct xenbus_device *dev, 1194 const struct xenbus_device_id *id) 1195 { 1196 int err; 1197 1198 struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info), 1199 GFP_KERNEL); 1200 1201 pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id); 1202 1203 if (!info) { 1204 xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure"); 1205 return -ENOMEM; 1206 } 1207 info->dev = dev; 1208 dev_set_drvdata(&dev->dev, info); 1209 1210 info->domid = dev->otherend_id; 1211 spin_lock_init(&info->ring_lock); 1212 info->ring_error = 0; 1213 atomic_set(&info->nr_unreplied_reqs, 0); 1214 init_waitqueue_head(&info->waiting_to_free); 1215 info->dev = dev; 1216 info->irq = 0; 1217 INIT_LIST_HEAD(&info->v2p_entry_lists); 1218 spin_lock_init(&info->v2p_lock); 1219 1220 err = xenbus_printf(XBT_NIL, dev->nodename, "feature-sg-grant", "%u", 1221 SG_ALL); 1222 if (err) 1223 xenbus_dev_error(dev, err, "writing feature-sg-grant"); 1224 1225 err = xenbus_switch_state(dev, XenbusStateInitWait); 1226 if (err) 1227 goto fail; 1228 1229 return 0; 1230 1231 fail: 1232 pr_warn("%s failed\n", __func__); 1233 scsiback_remove(dev); 1234 1235 return err; 1236 } 1237 1238 static char *scsiback_dump_proto_id(struct scsiback_tport *tport) 1239 { 1240 switch (tport->tport_proto_id) { 1241 case SCSI_PROTOCOL_SAS: 1242 return "SAS"; 1243 case SCSI_PROTOCOL_FCP: 1244 return "FCP"; 1245 case SCSI_PROTOCOL_ISCSI: 1246 return "iSCSI"; 1247 default: 1248 break; 1249 } 1250 1251 return "Unknown"; 1252 } 1253 1254 static u8 scsiback_get_fabric_proto_ident(struct se_portal_group *se_tpg) 1255 { 1256 struct scsiback_tpg *tpg = container_of(se_tpg, 1257 struct scsiback_tpg, se_tpg); 1258 struct scsiback_tport *tport = tpg->tport; 1259 1260 switch (tport->tport_proto_id) { 1261 case SCSI_PROTOCOL_SAS: 1262 return sas_get_fabric_proto_ident(se_tpg); 1263 case SCSI_PROTOCOL_FCP: 1264 return fc_get_fabric_proto_ident(se_tpg); 1265 case SCSI_PROTOCOL_ISCSI: 1266 return iscsi_get_fabric_proto_ident(se_tpg); 1267 default: 1268 pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", 1269 tport->tport_proto_id); 1270 break; 1271 } 1272 1273 return sas_get_fabric_proto_ident(se_tpg); 1274 } 1275 1276 static char *scsiback_get_fabric_wwn(struct se_portal_group *se_tpg) 1277 { 1278 struct scsiback_tpg *tpg = container_of(se_tpg, 1279 struct scsiback_tpg, se_tpg); 1280 struct scsiback_tport *tport = tpg->tport; 1281 1282 return &tport->tport_name[0]; 1283 } 1284 1285 static u16 scsiback_get_tag(struct se_portal_group *se_tpg) 1286 { 1287 struct scsiback_tpg *tpg = container_of(se_tpg, 1288 struct scsiback_tpg, se_tpg); 1289 return tpg->tport_tpgt; 1290 } 1291 1292 static u32 scsiback_get_default_depth(struct se_portal_group *se_tpg) 1293 { 1294 return 1; 1295 } 1296 1297 static u32 1298 scsiback_get_pr_transport_id(struct se_portal_group *se_tpg, 1299 struct se_node_acl *se_nacl, 1300 struct t10_pr_registration *pr_reg, 1301 int *format_code, 1302 unsigned char *buf) 1303 { 1304 struct scsiback_tpg *tpg = container_of(se_tpg, 1305 struct scsiback_tpg, se_tpg); 1306 struct scsiback_tport *tport = tpg->tport; 1307 1308 switch (tport->tport_proto_id) { 1309 case SCSI_PROTOCOL_SAS: 1310 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 1311 format_code, buf); 1312 case SCSI_PROTOCOL_FCP: 1313 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 1314 format_code, buf); 1315 case SCSI_PROTOCOL_ISCSI: 1316 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 1317 format_code, buf); 1318 default: 1319 pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", 1320 tport->tport_proto_id); 1321 break; 1322 } 1323 1324 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 1325 format_code, buf); 1326 } 1327 1328 static u32 1329 scsiback_get_pr_transport_id_len(struct se_portal_group *se_tpg, 1330 struct se_node_acl *se_nacl, 1331 struct t10_pr_registration *pr_reg, 1332 int *format_code) 1333 { 1334 struct scsiback_tpg *tpg = container_of(se_tpg, 1335 struct scsiback_tpg, se_tpg); 1336 struct scsiback_tport *tport = tpg->tport; 1337 1338 switch (tport->tport_proto_id) { 1339 case SCSI_PROTOCOL_SAS: 1340 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 1341 format_code); 1342 case SCSI_PROTOCOL_FCP: 1343 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 1344 format_code); 1345 case SCSI_PROTOCOL_ISCSI: 1346 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 1347 format_code); 1348 default: 1349 pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", 1350 tport->tport_proto_id); 1351 break; 1352 } 1353 1354 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 1355 format_code); 1356 } 1357 1358 static char * 1359 scsiback_parse_pr_out_transport_id(struct se_portal_group *se_tpg, 1360 const char *buf, 1361 u32 *out_tid_len, 1362 char **port_nexus_ptr) 1363 { 1364 struct scsiback_tpg *tpg = container_of(se_tpg, 1365 struct scsiback_tpg, se_tpg); 1366 struct scsiback_tport *tport = tpg->tport; 1367 1368 switch (tport->tport_proto_id) { 1369 case SCSI_PROTOCOL_SAS: 1370 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 1371 port_nexus_ptr); 1372 case SCSI_PROTOCOL_FCP: 1373 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 1374 port_nexus_ptr); 1375 case SCSI_PROTOCOL_ISCSI: 1376 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 1377 port_nexus_ptr); 1378 default: 1379 pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", 1380 tport->tport_proto_id); 1381 break; 1382 } 1383 1384 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 1385 port_nexus_ptr); 1386 } 1387 1388 static struct se_wwn * 1389 scsiback_make_tport(struct target_fabric_configfs *tf, 1390 struct config_group *group, 1391 const char *name) 1392 { 1393 struct scsiback_tport *tport; 1394 char *ptr; 1395 u64 wwpn = 0; 1396 int off = 0; 1397 1398 tport = kzalloc(sizeof(struct scsiback_tport), GFP_KERNEL); 1399 if (!tport) 1400 return ERR_PTR(-ENOMEM); 1401 1402 tport->tport_wwpn = wwpn; 1403 /* 1404 * Determine the emulated Protocol Identifier and Target Port Name 1405 * based on the incoming configfs directory name. 1406 */ 1407 ptr = strstr(name, "naa."); 1408 if (ptr) { 1409 tport->tport_proto_id = SCSI_PROTOCOL_SAS; 1410 goto check_len; 1411 } 1412 ptr = strstr(name, "fc."); 1413 if (ptr) { 1414 tport->tport_proto_id = SCSI_PROTOCOL_FCP; 1415 off = 3; /* Skip over "fc." */ 1416 goto check_len; 1417 } 1418 ptr = strstr(name, "iqn."); 1419 if (ptr) { 1420 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; 1421 goto check_len; 1422 } 1423 1424 pr_err("Unable to locate prefix for emulated Target Port: %s\n", name); 1425 kfree(tport); 1426 return ERR_PTR(-EINVAL); 1427 1428 check_len: 1429 if (strlen(name) >= VSCSI_NAMELEN) { 1430 pr_err("Emulated %s Address: %s, exceeds max: %d\n", name, 1431 scsiback_dump_proto_id(tport), VSCSI_NAMELEN); 1432 kfree(tport); 1433 return ERR_PTR(-EINVAL); 1434 } 1435 snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]); 1436 1437 pr_debug("Allocated emulated Target %s Address: %s\n", 1438 scsiback_dump_proto_id(tport), name); 1439 1440 return &tport->tport_wwn; 1441 } 1442 1443 static void scsiback_drop_tport(struct se_wwn *wwn) 1444 { 1445 struct scsiback_tport *tport = container_of(wwn, 1446 struct scsiback_tport, tport_wwn); 1447 1448 pr_debug("Deallocating emulated Target %s Address: %s\n", 1449 scsiback_dump_proto_id(tport), tport->tport_name); 1450 1451 kfree(tport); 1452 } 1453 1454 static struct se_node_acl * 1455 scsiback_alloc_fabric_acl(struct se_portal_group *se_tpg) 1456 { 1457 return kzalloc(sizeof(struct se_node_acl), GFP_KERNEL); 1458 } 1459 1460 static void 1461 scsiback_release_fabric_acl(struct se_portal_group *se_tpg, 1462 struct se_node_acl *se_nacl) 1463 { 1464 kfree(se_nacl); 1465 } 1466 1467 static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg) 1468 { 1469 return 1; 1470 } 1471 1472 static int scsiback_check_stop_free(struct se_cmd *se_cmd) 1473 { 1474 /* 1475 * Do not release struct se_cmd's containing a valid TMR pointer. 1476 * These will be released directly in scsiback_device_action() 1477 * with transport_generic_free_cmd(). 1478 */ 1479 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 1480 return 0; 1481 1482 transport_generic_free_cmd(se_cmd, 0); 1483 return 1; 1484 } 1485 1486 static void scsiback_release_cmd(struct se_cmd *se_cmd) 1487 { 1488 struct vscsibk_pend *pending_req = container_of(se_cmd, 1489 struct vscsibk_pend, se_cmd); 1490 1491 kmem_cache_free(scsiback_cachep, pending_req); 1492 } 1493 1494 static int scsiback_shutdown_session(struct se_session *se_sess) 1495 { 1496 return 0; 1497 } 1498 1499 static void scsiback_close_session(struct se_session *se_sess) 1500 { 1501 } 1502 1503 static u32 scsiback_sess_get_index(struct se_session *se_sess) 1504 { 1505 return 0; 1506 } 1507 1508 static int scsiback_write_pending(struct se_cmd *se_cmd) 1509 { 1510 /* Go ahead and process the write immediately */ 1511 target_execute_cmd(se_cmd); 1512 1513 return 0; 1514 } 1515 1516 static int scsiback_write_pending_status(struct se_cmd *se_cmd) 1517 { 1518 return 0; 1519 } 1520 1521 static void scsiback_set_default_node_attrs(struct se_node_acl *nacl) 1522 { 1523 } 1524 1525 static u32 scsiback_get_task_tag(struct se_cmd *se_cmd) 1526 { 1527 struct vscsibk_pend *pending_req = container_of(se_cmd, 1528 struct vscsibk_pend, se_cmd); 1529 1530 return pending_req->rqid; 1531 } 1532 1533 static int scsiback_get_cmd_state(struct se_cmd *se_cmd) 1534 { 1535 return 0; 1536 } 1537 1538 static int scsiback_queue_data_in(struct se_cmd *se_cmd) 1539 { 1540 struct vscsibk_pend *pending_req = container_of(se_cmd, 1541 struct vscsibk_pend, se_cmd); 1542 1543 pending_req->result = SAM_STAT_GOOD; 1544 scsiback_cmd_done(pending_req); 1545 return 0; 1546 } 1547 1548 static int scsiback_queue_status(struct se_cmd *se_cmd) 1549 { 1550 struct vscsibk_pend *pending_req = container_of(se_cmd, 1551 struct vscsibk_pend, se_cmd); 1552 1553 if (se_cmd->sense_buffer && 1554 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 1555 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) 1556 pending_req->result = (DRIVER_SENSE << 24) | 1557 SAM_STAT_CHECK_CONDITION; 1558 else 1559 pending_req->result = se_cmd->scsi_status; 1560 1561 scsiback_cmd_done(pending_req); 1562 return 0; 1563 } 1564 1565 static void scsiback_queue_tm_rsp(struct se_cmd *se_cmd) 1566 { 1567 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; 1568 struct scsiback_tmr *tmr = se_tmr->fabric_tmr_ptr; 1569 1570 atomic_set(&tmr->tmr_complete, 1); 1571 wake_up(&tmr->tmr_wait); 1572 } 1573 1574 static void scsiback_aborted_task(struct se_cmd *se_cmd) 1575 { 1576 } 1577 1578 static ssize_t scsiback_tpg_param_show_alias(struct se_portal_group *se_tpg, 1579 char *page) 1580 { 1581 struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, 1582 se_tpg); 1583 ssize_t rb; 1584 1585 mutex_lock(&tpg->tv_tpg_mutex); 1586 rb = snprintf(page, PAGE_SIZE, "%s\n", tpg->param_alias); 1587 mutex_unlock(&tpg->tv_tpg_mutex); 1588 1589 return rb; 1590 } 1591 1592 static ssize_t scsiback_tpg_param_store_alias(struct se_portal_group *se_tpg, 1593 const char *page, size_t count) 1594 { 1595 struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, 1596 se_tpg); 1597 int len; 1598 1599 if (strlen(page) >= VSCSI_NAMELEN) { 1600 pr_err("param alias: %s, exceeds max: %d\n", page, 1601 VSCSI_NAMELEN); 1602 return -EINVAL; 1603 } 1604 1605 mutex_lock(&tpg->tv_tpg_mutex); 1606 len = snprintf(tpg->param_alias, VSCSI_NAMELEN, "%s", page); 1607 if (tpg->param_alias[len - 1] == '\n') 1608 tpg->param_alias[len - 1] = '\0'; 1609 mutex_unlock(&tpg->tv_tpg_mutex); 1610 1611 return count; 1612 } 1613 1614 TF_TPG_PARAM_ATTR(scsiback, alias, S_IRUGO | S_IWUSR); 1615 1616 static struct configfs_attribute *scsiback_param_attrs[] = { 1617 &scsiback_tpg_param_alias.attr, 1618 NULL, 1619 }; 1620 1621 static int scsiback_make_nexus(struct scsiback_tpg *tpg, 1622 const char *name) 1623 { 1624 struct se_portal_group *se_tpg; 1625 struct se_session *se_sess; 1626 struct scsiback_nexus *tv_nexus; 1627 1628 mutex_lock(&tpg->tv_tpg_mutex); 1629 if (tpg->tpg_nexus) { 1630 mutex_unlock(&tpg->tv_tpg_mutex); 1631 pr_debug("tpg->tpg_nexus already exists\n"); 1632 return -EEXIST; 1633 } 1634 se_tpg = &tpg->se_tpg; 1635 1636 tv_nexus = kzalloc(sizeof(struct scsiback_nexus), GFP_KERNEL); 1637 if (!tv_nexus) { 1638 mutex_unlock(&tpg->tv_tpg_mutex); 1639 return -ENOMEM; 1640 } 1641 /* 1642 * Initialize the struct se_session pointer 1643 */ 1644 tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL); 1645 if (IS_ERR(tv_nexus->tvn_se_sess)) { 1646 mutex_unlock(&tpg->tv_tpg_mutex); 1647 kfree(tv_nexus); 1648 return -ENOMEM; 1649 } 1650 se_sess = tv_nexus->tvn_se_sess; 1651 /* 1652 * Since we are running in 'demo mode' this call with generate a 1653 * struct se_node_acl for the scsiback struct se_portal_group with 1654 * the SCSI Initiator port name of the passed configfs group 'name'. 1655 */ 1656 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1657 se_tpg, (unsigned char *)name); 1658 if (!tv_nexus->tvn_se_sess->se_node_acl) { 1659 mutex_unlock(&tpg->tv_tpg_mutex); 1660 pr_debug("core_tpg_check_initiator_node_acl() failed for %s\n", 1661 name); 1662 goto out; 1663 } 1664 /* Now register the TCM pvscsi virtual I_T Nexus as active. */ 1665 transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, 1666 tv_nexus->tvn_se_sess, tv_nexus); 1667 tpg->tpg_nexus = tv_nexus; 1668 1669 mutex_unlock(&tpg->tv_tpg_mutex); 1670 return 0; 1671 1672 out: 1673 transport_free_session(se_sess); 1674 kfree(tv_nexus); 1675 return -ENOMEM; 1676 } 1677 1678 static int scsiback_drop_nexus(struct scsiback_tpg *tpg) 1679 { 1680 struct se_session *se_sess; 1681 struct scsiback_nexus *tv_nexus; 1682 1683 mutex_lock(&tpg->tv_tpg_mutex); 1684 tv_nexus = tpg->tpg_nexus; 1685 if (!tv_nexus) { 1686 mutex_unlock(&tpg->tv_tpg_mutex); 1687 return -ENODEV; 1688 } 1689 1690 se_sess = tv_nexus->tvn_se_sess; 1691 if (!se_sess) { 1692 mutex_unlock(&tpg->tv_tpg_mutex); 1693 return -ENODEV; 1694 } 1695 1696 if (tpg->tv_tpg_port_count != 0) { 1697 mutex_unlock(&tpg->tv_tpg_mutex); 1698 pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG port count: %d\n", 1699 tpg->tv_tpg_port_count); 1700 return -EBUSY; 1701 } 1702 1703 if (tpg->tv_tpg_fe_count != 0) { 1704 mutex_unlock(&tpg->tv_tpg_mutex); 1705 pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG frontend count: %d\n", 1706 tpg->tv_tpg_fe_count); 1707 return -EBUSY; 1708 } 1709 1710 pr_debug("Removing I_T Nexus to emulated %s Initiator Port: %s\n", 1711 scsiback_dump_proto_id(tpg->tport), 1712 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1713 1714 /* 1715 * Release the SCSI I_T Nexus to the emulated xen-pvscsi Target Port 1716 */ 1717 transport_deregister_session(tv_nexus->tvn_se_sess); 1718 tpg->tpg_nexus = NULL; 1719 mutex_unlock(&tpg->tv_tpg_mutex); 1720 1721 kfree(tv_nexus); 1722 return 0; 1723 } 1724 1725 static ssize_t scsiback_tpg_show_nexus(struct se_portal_group *se_tpg, 1726 char *page) 1727 { 1728 struct scsiback_tpg *tpg = container_of(se_tpg, 1729 struct scsiback_tpg, se_tpg); 1730 struct scsiback_nexus *tv_nexus; 1731 ssize_t ret; 1732 1733 mutex_lock(&tpg->tv_tpg_mutex); 1734 tv_nexus = tpg->tpg_nexus; 1735 if (!tv_nexus) { 1736 mutex_unlock(&tpg->tv_tpg_mutex); 1737 return -ENODEV; 1738 } 1739 ret = snprintf(page, PAGE_SIZE, "%s\n", 1740 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1741 mutex_unlock(&tpg->tv_tpg_mutex); 1742 1743 return ret; 1744 } 1745 1746 static ssize_t scsiback_tpg_store_nexus(struct se_portal_group *se_tpg, 1747 const char *page, 1748 size_t count) 1749 { 1750 struct scsiback_tpg *tpg = container_of(se_tpg, 1751 struct scsiback_tpg, se_tpg); 1752 struct scsiback_tport *tport_wwn = tpg->tport; 1753 unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr; 1754 int ret; 1755 /* 1756 * Shutdown the active I_T nexus if 'NULL' is passed. 1757 */ 1758 if (!strncmp(page, "NULL", 4)) { 1759 ret = scsiback_drop_nexus(tpg); 1760 return (!ret) ? count : ret; 1761 } 1762 /* 1763 * Otherwise make sure the passed virtual Initiator port WWN matches 1764 * the fabric protocol_id set in scsiback_make_tport(), and call 1765 * scsiback_make_nexus(). 1766 */ 1767 if (strlen(page) >= VSCSI_NAMELEN) { 1768 pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n", 1769 page, VSCSI_NAMELEN); 1770 return -EINVAL; 1771 } 1772 snprintf(&i_port[0], VSCSI_NAMELEN, "%s", page); 1773 1774 ptr = strstr(i_port, "naa."); 1775 if (ptr) { 1776 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { 1777 pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n", 1778 i_port, scsiback_dump_proto_id(tport_wwn)); 1779 return -EINVAL; 1780 } 1781 port_ptr = &i_port[0]; 1782 goto check_newline; 1783 } 1784 ptr = strstr(i_port, "fc."); 1785 if (ptr) { 1786 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { 1787 pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n", 1788 i_port, scsiback_dump_proto_id(tport_wwn)); 1789 return -EINVAL; 1790 } 1791 port_ptr = &i_port[3]; /* Skip over "fc." */ 1792 goto check_newline; 1793 } 1794 ptr = strstr(i_port, "iqn."); 1795 if (ptr) { 1796 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { 1797 pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n", 1798 i_port, scsiback_dump_proto_id(tport_wwn)); 1799 return -EINVAL; 1800 } 1801 port_ptr = &i_port[0]; 1802 goto check_newline; 1803 } 1804 pr_err("Unable to locate prefix for emulated Initiator Port: %s\n", 1805 i_port); 1806 return -EINVAL; 1807 /* 1808 * Clear any trailing newline for the NAA WWN 1809 */ 1810 check_newline: 1811 if (i_port[strlen(i_port) - 1] == '\n') 1812 i_port[strlen(i_port) - 1] = '\0'; 1813 1814 ret = scsiback_make_nexus(tpg, port_ptr); 1815 if (ret < 0) 1816 return ret; 1817 1818 return count; 1819 } 1820 1821 TF_TPG_BASE_ATTR(scsiback, nexus, S_IRUGO | S_IWUSR); 1822 1823 static struct configfs_attribute *scsiback_tpg_attrs[] = { 1824 &scsiback_tpg_nexus.attr, 1825 NULL, 1826 }; 1827 1828 static ssize_t 1829 scsiback_wwn_show_attr_version(struct target_fabric_configfs *tf, 1830 char *page) 1831 { 1832 return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on " 1833 UTS_RELEASE"\n", 1834 VSCSI_VERSION, utsname()->sysname, utsname()->machine); 1835 } 1836 1837 TF_WWN_ATTR_RO(scsiback, version); 1838 1839 static struct configfs_attribute *scsiback_wwn_attrs[] = { 1840 &scsiback_wwn_version.attr, 1841 NULL, 1842 }; 1843 1844 static char *scsiback_get_fabric_name(void) 1845 { 1846 return "xen-pvscsi"; 1847 } 1848 1849 static int scsiback_port_link(struct se_portal_group *se_tpg, 1850 struct se_lun *lun) 1851 { 1852 struct scsiback_tpg *tpg = container_of(se_tpg, 1853 struct scsiback_tpg, se_tpg); 1854 1855 mutex_lock(&tpg->tv_tpg_mutex); 1856 tpg->tv_tpg_port_count++; 1857 mutex_unlock(&tpg->tv_tpg_mutex); 1858 1859 return 0; 1860 } 1861 1862 static void scsiback_port_unlink(struct se_portal_group *se_tpg, 1863 struct se_lun *lun) 1864 { 1865 struct scsiback_tpg *tpg = container_of(se_tpg, 1866 struct scsiback_tpg, se_tpg); 1867 1868 mutex_lock(&tpg->tv_tpg_mutex); 1869 tpg->tv_tpg_port_count--; 1870 mutex_unlock(&tpg->tv_tpg_mutex); 1871 } 1872 1873 static struct se_portal_group * 1874 scsiback_make_tpg(struct se_wwn *wwn, 1875 struct config_group *group, 1876 const char *name) 1877 { 1878 struct scsiback_tport *tport = container_of(wwn, 1879 struct scsiback_tport, tport_wwn); 1880 1881 struct scsiback_tpg *tpg; 1882 u16 tpgt; 1883 int ret; 1884 1885 if (strstr(name, "tpgt_") != name) 1886 return ERR_PTR(-EINVAL); 1887 ret = kstrtou16(name + 5, 10, &tpgt); 1888 if (ret) 1889 return ERR_PTR(ret); 1890 1891 tpg = kzalloc(sizeof(struct scsiback_tpg), GFP_KERNEL); 1892 if (!tpg) 1893 return ERR_PTR(-ENOMEM); 1894 1895 mutex_init(&tpg->tv_tpg_mutex); 1896 INIT_LIST_HEAD(&tpg->tv_tpg_list); 1897 INIT_LIST_HEAD(&tpg->info_list); 1898 tpg->tport = tport; 1899 tpg->tport_tpgt = tpgt; 1900 1901 ret = core_tpg_register(&scsiback_ops, wwn, 1902 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL); 1903 if (ret < 0) { 1904 kfree(tpg); 1905 return NULL; 1906 } 1907 mutex_lock(&scsiback_mutex); 1908 list_add_tail(&tpg->tv_tpg_list, &scsiback_list); 1909 mutex_unlock(&scsiback_mutex); 1910 1911 return &tpg->se_tpg; 1912 } 1913 1914 static void scsiback_drop_tpg(struct se_portal_group *se_tpg) 1915 { 1916 struct scsiback_tpg *tpg = container_of(se_tpg, 1917 struct scsiback_tpg, se_tpg); 1918 1919 mutex_lock(&scsiback_mutex); 1920 list_del(&tpg->tv_tpg_list); 1921 mutex_unlock(&scsiback_mutex); 1922 /* 1923 * Release the virtual I_T Nexus for this xen-pvscsi TPG 1924 */ 1925 scsiback_drop_nexus(tpg); 1926 /* 1927 * Deregister the se_tpg from TCM. 1928 */ 1929 core_tpg_deregister(se_tpg); 1930 kfree(tpg); 1931 } 1932 1933 static int scsiback_check_true(struct se_portal_group *se_tpg) 1934 { 1935 return 1; 1936 } 1937 1938 static int scsiback_check_false(struct se_portal_group *se_tpg) 1939 { 1940 return 0; 1941 } 1942 1943 static const struct target_core_fabric_ops scsiback_ops = { 1944 .module = THIS_MODULE, 1945 .name = "xen-pvscsi", 1946 .get_fabric_name = scsiback_get_fabric_name, 1947 .get_fabric_proto_ident = scsiback_get_fabric_proto_ident, 1948 .tpg_get_wwn = scsiback_get_fabric_wwn, 1949 .tpg_get_tag = scsiback_get_tag, 1950 .tpg_get_default_depth = scsiback_get_default_depth, 1951 .tpg_get_pr_transport_id = scsiback_get_pr_transport_id, 1952 .tpg_get_pr_transport_id_len = scsiback_get_pr_transport_id_len, 1953 .tpg_parse_pr_out_transport_id = scsiback_parse_pr_out_transport_id, 1954 .tpg_check_demo_mode = scsiback_check_true, 1955 .tpg_check_demo_mode_cache = scsiback_check_true, 1956 .tpg_check_demo_mode_write_protect = scsiback_check_false, 1957 .tpg_check_prod_mode_write_protect = scsiback_check_false, 1958 .tpg_alloc_fabric_acl = scsiback_alloc_fabric_acl, 1959 .tpg_release_fabric_acl = scsiback_release_fabric_acl, 1960 .tpg_get_inst_index = scsiback_tpg_get_inst_index, 1961 .check_stop_free = scsiback_check_stop_free, 1962 .release_cmd = scsiback_release_cmd, 1963 .put_session = NULL, 1964 .shutdown_session = scsiback_shutdown_session, 1965 .close_session = scsiback_close_session, 1966 .sess_get_index = scsiback_sess_get_index, 1967 .sess_get_initiator_sid = NULL, 1968 .write_pending = scsiback_write_pending, 1969 .write_pending_status = scsiback_write_pending_status, 1970 .set_default_node_attributes = scsiback_set_default_node_attrs, 1971 .get_task_tag = scsiback_get_task_tag, 1972 .get_cmd_state = scsiback_get_cmd_state, 1973 .queue_data_in = scsiback_queue_data_in, 1974 .queue_status = scsiback_queue_status, 1975 .queue_tm_rsp = scsiback_queue_tm_rsp, 1976 .aborted_task = scsiback_aborted_task, 1977 /* 1978 * Setup callers for generic logic in target_core_fabric_configfs.c 1979 */ 1980 .fabric_make_wwn = scsiback_make_tport, 1981 .fabric_drop_wwn = scsiback_drop_tport, 1982 .fabric_make_tpg = scsiback_make_tpg, 1983 .fabric_drop_tpg = scsiback_drop_tpg, 1984 .fabric_post_link = scsiback_port_link, 1985 .fabric_pre_unlink = scsiback_port_unlink, 1986 .fabric_make_np = NULL, 1987 .fabric_drop_np = NULL, 1988 #if 0 1989 .fabric_make_nodeacl = scsiback_make_nodeacl, 1990 .fabric_drop_nodeacl = scsiback_drop_nodeacl, 1991 #endif 1992 1993 .tfc_wwn_attrs = scsiback_wwn_attrs, 1994 .tfc_tpg_base_attrs = scsiback_tpg_attrs, 1995 .tfc_tpg_param_attrs = scsiback_param_attrs, 1996 }; 1997 1998 static const struct xenbus_device_id scsiback_ids[] = { 1999 { "vscsi" }, 2000 { "" } 2001 }; 2002 2003 static struct xenbus_driver scsiback_driver = { 2004 .ids = scsiback_ids, 2005 .probe = scsiback_probe, 2006 .remove = scsiback_remove, 2007 .otherend_changed = scsiback_frontend_changed 2008 }; 2009 2010 static void scsiback_init_pend(void *p) 2011 { 2012 struct vscsibk_pend *pend = p; 2013 int i; 2014 2015 memset(pend, 0, sizeof(*pend)); 2016 for (i = 0; i < VSCSI_MAX_GRANTS; i++) 2017 pend->grant_handles[i] = SCSIBACK_INVALID_HANDLE; 2018 } 2019 2020 static int __init scsiback_init(void) 2021 { 2022 int ret; 2023 2024 if (!xen_domain()) 2025 return -ENODEV; 2026 2027 pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n", 2028 VSCSI_VERSION, utsname()->sysname, utsname()->machine); 2029 2030 scsiback_cachep = kmem_cache_create("vscsiif_cache", 2031 sizeof(struct vscsibk_pend), 0, 0, scsiback_init_pend); 2032 if (!scsiback_cachep) 2033 return -ENOMEM; 2034 2035 ret = xenbus_register_backend(&scsiback_driver); 2036 if (ret) 2037 goto out_cache_destroy; 2038 2039 ret = target_register_template(&scsiback_ops); 2040 if (ret) 2041 goto out_unregister_xenbus; 2042 2043 return 0; 2044 2045 out_unregister_xenbus: 2046 xenbus_unregister_driver(&scsiback_driver); 2047 out_cache_destroy: 2048 kmem_cache_destroy(scsiback_cachep); 2049 pr_err("%s: error %d\n", __func__, ret); 2050 return ret; 2051 } 2052 2053 static void __exit scsiback_exit(void) 2054 { 2055 struct page *page; 2056 2057 while (free_pages_num) { 2058 if (get_free_page(&page)) 2059 BUG(); 2060 gnttab_free_pages(1, &page); 2061 } 2062 target_unregister_template(&scsiback_ops); 2063 xenbus_unregister_driver(&scsiback_driver); 2064 kmem_cache_destroy(scsiback_cachep); 2065 } 2066 2067 module_init(scsiback_init); 2068 module_exit(scsiback_exit); 2069 2070 MODULE_DESCRIPTION("Xen SCSI backend driver"); 2071 MODULE_LICENSE("Dual BSD/GPL"); 2072 MODULE_ALIAS("xen-backend:vscsi"); 2073 MODULE_AUTHOR("Juergen Gross <jgross@suse.com>"); 2074