1 /* 2 * Xen SCSI backend driver 3 * 4 * Copyright (c) 2008, FUJITSU Limited 5 * 6 * Based on the blkback driver code. 7 * Adaption to kernel taget core infrastructure taken from vhost/scsi.c 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU General Public License version 2 11 * as published by the Free Software Foundation; or, when distributed 12 * separately from the Linux kernel or incorporated into other 13 * software packages, subject to the following license: 14 * 15 * Permission is hereby granted, free of charge, to any person obtaining a copy 16 * of this source file (the "Software"), to deal in the Software without 17 * restriction, including without limitation the rights to use, copy, modify, 18 * merge, publish, distribute, sublicense, and/or sell copies of the Software, 19 * and to permit persons to whom the Software is furnished to do so, subject to 20 * the following conditions: 21 * 22 * The above copyright notice and this permission notice shall be included in 23 * all copies or substantial portions of the Software. 24 * 25 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 26 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 27 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 28 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 29 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 30 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS 31 * IN THE SOFTWARE. 32 */ 33 34 #include <stdarg.h> 35 36 #include <linux/module.h> 37 #include <linux/utsname.h> 38 #include <linux/interrupt.h> 39 #include <linux/slab.h> 40 #include <linux/wait.h> 41 #include <linux/sched.h> 42 #include <linux/list.h> 43 #include <linux/gfp.h> 44 #include <linux/delay.h> 45 #include <linux/spinlock.h> 46 #include <linux/configfs.h> 47 48 #include <generated/utsrelease.h> 49 50 #include <scsi/scsi.h> 51 #include <scsi/scsi_dbg.h> 52 #include <scsi/scsi_eh.h> 53 #include <scsi/scsi_tcq.h> 54 55 #include <target/target_core_base.h> 56 #include <target/target_core_fabric.h> 57 #include <target/target_core_configfs.h> 58 #include <target/target_core_fabric_configfs.h> 59 60 #include <asm/hypervisor.h> 61 62 #include <xen/xen.h> 63 #include <xen/balloon.h> 64 #include <xen/events.h> 65 #include <xen/xenbus.h> 66 #include <xen/grant_table.h> 67 #include <xen/page.h> 68 69 #include <xen/interface/grant_table.h> 70 #include <xen/interface/io/vscsiif.h> 71 72 #define DPRINTK(_f, _a...) \ 73 pr_debug("(file=%s, line=%d) " _f, __FILE__ , __LINE__ , ## _a) 74 75 #define VSCSI_VERSION "v0.1" 76 #define VSCSI_NAMELEN 32 77 78 struct ids_tuple { 79 unsigned int hst; /* host */ 80 unsigned int chn; /* channel */ 81 unsigned int tgt; /* target */ 82 unsigned int lun; /* LUN */ 83 }; 84 85 struct v2p_entry { 86 struct ids_tuple v; /* translate from */ 87 struct scsiback_tpg *tpg; /* translate to */ 88 unsigned int lun; 89 struct kref kref; 90 struct list_head l; 91 }; 92 93 struct vscsibk_info { 94 struct xenbus_device *dev; 95 96 domid_t domid; 97 unsigned int irq; 98 99 struct vscsiif_back_ring ring; 100 int ring_error; 101 102 spinlock_t ring_lock; 103 atomic_t nr_unreplied_reqs; 104 105 spinlock_t v2p_lock; 106 struct list_head v2p_entry_lists; 107 108 wait_queue_head_t waiting_to_free; 109 }; 110 111 /* theoretical maximum of grants for one request */ 112 #define VSCSI_MAX_GRANTS (SG_ALL + VSCSIIF_SG_TABLESIZE) 113 114 /* 115 * VSCSI_GRANT_BATCH is the maximum number of grants to be processed in one 116 * call to map/unmap grants. Don't choose it too large, as there are arrays 117 * with VSCSI_GRANT_BATCH elements allocated on the stack. 118 */ 119 #define VSCSI_GRANT_BATCH 16 120 121 struct vscsibk_pend { 122 uint16_t rqid; 123 124 uint8_t cmnd[VSCSIIF_MAX_COMMAND_SIZE]; 125 uint8_t cmd_len; 126 127 uint8_t sc_data_direction; 128 uint16_t n_sg; /* real length of SG list */ 129 uint16_t n_grants; /* SG pages and potentially SG list */ 130 uint32_t data_len; 131 uint32_t result; 132 133 struct vscsibk_info *info; 134 struct v2p_entry *v2p; 135 struct scatterlist *sgl; 136 137 uint8_t sense_buffer[VSCSIIF_SENSE_BUFFERSIZE]; 138 139 grant_handle_t grant_handles[VSCSI_MAX_GRANTS]; 140 struct page *pages[VSCSI_MAX_GRANTS]; 141 142 struct se_cmd se_cmd; 143 }; 144 145 struct scsiback_tmr { 146 atomic_t tmr_complete; 147 wait_queue_head_t tmr_wait; 148 }; 149 150 struct scsiback_nexus { 151 /* Pointer to TCM session for I_T Nexus */ 152 struct se_session *tvn_se_sess; 153 }; 154 155 struct scsiback_tport { 156 /* SCSI protocol the tport is providing */ 157 u8 tport_proto_id; 158 /* Binary World Wide unique Port Name for pvscsi Target port */ 159 u64 tport_wwpn; 160 /* ASCII formatted WWPN for pvscsi Target port */ 161 char tport_name[VSCSI_NAMELEN]; 162 /* Returned by scsiback_make_tport() */ 163 struct se_wwn tport_wwn; 164 }; 165 166 struct scsiback_tpg { 167 /* scsiback port target portal group tag for TCM */ 168 u16 tport_tpgt; 169 /* track number of TPG Port/Lun Links wrt explicit I_T Nexus shutdown */ 170 int tv_tpg_port_count; 171 /* xen-pvscsi references to tpg_nexus, protected by tv_tpg_mutex */ 172 int tv_tpg_fe_count; 173 /* list for scsiback_list */ 174 struct list_head tv_tpg_list; 175 /* Used to protect access for tpg_nexus */ 176 struct mutex tv_tpg_mutex; 177 /* Pointer to the TCM pvscsi I_T Nexus for this TPG endpoint */ 178 struct scsiback_nexus *tpg_nexus; 179 /* Pointer back to scsiback_tport */ 180 struct scsiback_tport *tport; 181 /* Returned by scsiback_make_tpg() */ 182 struct se_portal_group se_tpg; 183 /* alias used in xenstore */ 184 char param_alias[VSCSI_NAMELEN]; 185 /* list of info structures related to this target portal group */ 186 struct list_head info_list; 187 }; 188 189 #define SCSIBACK_INVALID_HANDLE (~0) 190 191 static bool log_print_stat; 192 module_param(log_print_stat, bool, 0644); 193 194 static int scsiback_max_buffer_pages = 1024; 195 module_param_named(max_buffer_pages, scsiback_max_buffer_pages, int, 0644); 196 MODULE_PARM_DESC(max_buffer_pages, 197 "Maximum number of free pages to keep in backend buffer"); 198 199 static struct kmem_cache *scsiback_cachep; 200 static DEFINE_SPINLOCK(free_pages_lock); 201 static int free_pages_num; 202 static LIST_HEAD(scsiback_free_pages); 203 204 /* Global spinlock to protect scsiback TPG list */ 205 static DEFINE_MUTEX(scsiback_mutex); 206 static LIST_HEAD(scsiback_list); 207 208 /* Local pointer to allocated TCM configfs fabric module */ 209 static struct target_fabric_configfs *scsiback_fabric_configfs; 210 211 static void scsiback_get(struct vscsibk_info *info) 212 { 213 atomic_inc(&info->nr_unreplied_reqs); 214 } 215 216 static void scsiback_put(struct vscsibk_info *info) 217 { 218 if (atomic_dec_and_test(&info->nr_unreplied_reqs)) 219 wake_up(&info->waiting_to_free); 220 } 221 222 static void put_free_pages(struct page **page, int num) 223 { 224 unsigned long flags; 225 int i = free_pages_num + num, n = num; 226 227 if (num == 0) 228 return; 229 if (i > scsiback_max_buffer_pages) { 230 n = min(num, i - scsiback_max_buffer_pages); 231 gnttab_free_pages(n, page + num - n); 232 n = num - n; 233 } 234 spin_lock_irqsave(&free_pages_lock, flags); 235 for (i = 0; i < n; i++) 236 list_add(&page[i]->lru, &scsiback_free_pages); 237 free_pages_num += n; 238 spin_unlock_irqrestore(&free_pages_lock, flags); 239 } 240 241 static int get_free_page(struct page **page) 242 { 243 unsigned long flags; 244 245 spin_lock_irqsave(&free_pages_lock, flags); 246 if (list_empty(&scsiback_free_pages)) { 247 spin_unlock_irqrestore(&free_pages_lock, flags); 248 return gnttab_alloc_pages(1, page); 249 } 250 page[0] = list_first_entry(&scsiback_free_pages, struct page, lru); 251 list_del(&page[0]->lru); 252 free_pages_num--; 253 spin_unlock_irqrestore(&free_pages_lock, flags); 254 return 0; 255 } 256 257 static unsigned long vaddr_page(struct page *page) 258 { 259 unsigned long pfn = page_to_pfn(page); 260 261 return (unsigned long)pfn_to_kaddr(pfn); 262 } 263 264 static unsigned long vaddr(struct vscsibk_pend *req, int seg) 265 { 266 return vaddr_page(req->pages[seg]); 267 } 268 269 static void scsiback_print_status(char *sense_buffer, int errors, 270 struct vscsibk_pend *pending_req) 271 { 272 struct scsiback_tpg *tpg = pending_req->v2p->tpg; 273 274 pr_err("xen-pvscsi[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n", 275 tpg->tport->tport_name, pending_req->v2p->lun, 276 pending_req->cmnd[0], status_byte(errors), msg_byte(errors), 277 host_byte(errors), driver_byte(errors)); 278 } 279 280 static void scsiback_fast_flush_area(struct vscsibk_pend *req) 281 { 282 struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH]; 283 struct page *pages[VSCSI_GRANT_BATCH]; 284 unsigned int i, invcount = 0; 285 grant_handle_t handle; 286 int err; 287 288 kfree(req->sgl); 289 req->sgl = NULL; 290 req->n_sg = 0; 291 292 if (!req->n_grants) 293 return; 294 295 for (i = 0; i < req->n_grants; i++) { 296 handle = req->grant_handles[i]; 297 if (handle == SCSIBACK_INVALID_HANDLE) 298 continue; 299 gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i), 300 GNTMAP_host_map, handle); 301 req->grant_handles[i] = SCSIBACK_INVALID_HANDLE; 302 pages[invcount] = req->pages[i]; 303 put_page(pages[invcount]); 304 invcount++; 305 if (invcount < VSCSI_GRANT_BATCH) 306 continue; 307 err = gnttab_unmap_refs(unmap, NULL, pages, invcount); 308 BUG_ON(err); 309 invcount = 0; 310 } 311 312 if (invcount) { 313 err = gnttab_unmap_refs(unmap, NULL, pages, invcount); 314 BUG_ON(err); 315 } 316 317 put_free_pages(req->pages, req->n_grants); 318 req->n_grants = 0; 319 } 320 321 static void scsiback_free_translation_entry(struct kref *kref) 322 { 323 struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref); 324 struct scsiback_tpg *tpg = entry->tpg; 325 326 mutex_lock(&tpg->tv_tpg_mutex); 327 tpg->tv_tpg_fe_count--; 328 mutex_unlock(&tpg->tv_tpg_mutex); 329 330 kfree(entry); 331 } 332 333 static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result, 334 uint32_t resid, struct vscsibk_pend *pending_req) 335 { 336 struct vscsiif_response *ring_res; 337 struct vscsibk_info *info = pending_req->info; 338 int notify; 339 struct scsi_sense_hdr sshdr; 340 unsigned long flags; 341 unsigned len; 342 343 spin_lock_irqsave(&info->ring_lock, flags); 344 345 ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt); 346 info->ring.rsp_prod_pvt++; 347 348 ring_res->rslt = result; 349 ring_res->rqid = pending_req->rqid; 350 351 if (sense_buffer != NULL && 352 scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE, 353 &sshdr)) { 354 len = min_t(unsigned, 8 + sense_buffer[7], 355 VSCSIIF_SENSE_BUFFERSIZE); 356 memcpy(ring_res->sense_buffer, sense_buffer, len); 357 ring_res->sense_len = len; 358 } else { 359 ring_res->sense_len = 0; 360 } 361 362 ring_res->residual_len = resid; 363 364 RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify); 365 spin_unlock_irqrestore(&info->ring_lock, flags); 366 367 if (notify) 368 notify_remote_via_irq(info->irq); 369 370 if (pending_req->v2p) 371 kref_put(&pending_req->v2p->kref, 372 scsiback_free_translation_entry); 373 } 374 375 static void scsiback_cmd_done(struct vscsibk_pend *pending_req) 376 { 377 struct vscsibk_info *info = pending_req->info; 378 unsigned char *sense_buffer; 379 unsigned int resid; 380 int errors; 381 382 sense_buffer = pending_req->sense_buffer; 383 resid = pending_req->se_cmd.residual_count; 384 errors = pending_req->result; 385 386 if (errors && log_print_stat) 387 scsiback_print_status(sense_buffer, errors, pending_req); 388 389 scsiback_fast_flush_area(pending_req); 390 scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req); 391 scsiback_put(info); 392 } 393 394 static void scsiback_cmd_exec(struct vscsibk_pend *pending_req) 395 { 396 struct se_cmd *se_cmd = &pending_req->se_cmd; 397 struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess; 398 int rc; 399 400 memset(pending_req->sense_buffer, 0, VSCSIIF_SENSE_BUFFERSIZE); 401 402 memset(se_cmd, 0, sizeof(*se_cmd)); 403 404 scsiback_get(pending_req->info); 405 rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd, 406 pending_req->sense_buffer, pending_req->v2p->lun, 407 pending_req->data_len, 0, 408 pending_req->sc_data_direction, 0, 409 pending_req->sgl, pending_req->n_sg, 410 NULL, 0, NULL, 0); 411 if (rc < 0) { 412 transport_send_check_condition_and_sense(se_cmd, 413 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); 414 transport_generic_free_cmd(se_cmd, 0); 415 } 416 } 417 418 static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map, 419 struct page **pg, grant_handle_t *grant, int cnt) 420 { 421 int err, i; 422 423 if (!cnt) 424 return 0; 425 426 err = gnttab_map_refs(map, NULL, pg, cnt); 427 BUG_ON(err); 428 for (i = 0; i < cnt; i++) { 429 if (unlikely(map[i].status != GNTST_okay)) { 430 pr_err("xen-pvscsi: invalid buffer -- could not remap it\n"); 431 map[i].handle = SCSIBACK_INVALID_HANDLE; 432 err = -ENOMEM; 433 } else { 434 get_page(pg[i]); 435 } 436 grant[i] = map[i].handle; 437 } 438 return err; 439 } 440 441 static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req, 442 struct scsiif_request_segment *seg, struct page **pg, 443 grant_handle_t *grant, int cnt, u32 flags) 444 { 445 int mapcount = 0, i, err = 0; 446 struct gnttab_map_grant_ref map[VSCSI_GRANT_BATCH]; 447 struct vscsibk_info *info = pending_req->info; 448 449 for (i = 0; i < cnt; i++) { 450 if (get_free_page(pg + mapcount)) { 451 put_free_pages(pg, mapcount); 452 pr_err("xen-pvscsi: no grant page\n"); 453 return -ENOMEM; 454 } 455 gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]), 456 flags, seg[i].gref, info->domid); 457 mapcount++; 458 if (mapcount < VSCSI_GRANT_BATCH) 459 continue; 460 err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); 461 pg += mapcount; 462 grant += mapcount; 463 pending_req->n_grants += mapcount; 464 if (err) 465 return err; 466 mapcount = 0; 467 } 468 err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); 469 pending_req->n_grants += mapcount; 470 return err; 471 } 472 473 static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req, 474 struct vscsibk_pend *pending_req) 475 { 476 u32 flags; 477 int i, err, n_segs, i_seg = 0; 478 struct page **pg; 479 struct scsiif_request_segment *seg; 480 unsigned long end_seg = 0; 481 unsigned int nr_segments = (unsigned int)ring_req->nr_segments; 482 unsigned int nr_sgl = 0; 483 struct scatterlist *sg; 484 grant_handle_t *grant; 485 486 pending_req->n_sg = 0; 487 pending_req->n_grants = 0; 488 pending_req->data_len = 0; 489 490 nr_segments &= ~VSCSIIF_SG_GRANT; 491 if (!nr_segments) 492 return 0; 493 494 if (nr_segments > VSCSIIF_SG_TABLESIZE) { 495 DPRINTK("xen-pvscsi: invalid parameter nr_seg = %d\n", 496 ring_req->nr_segments); 497 return -EINVAL; 498 } 499 500 if (ring_req->nr_segments & VSCSIIF_SG_GRANT) { 501 err = scsiback_gnttab_data_map_list(pending_req, ring_req->seg, 502 pending_req->pages, pending_req->grant_handles, 503 nr_segments, GNTMAP_host_map | GNTMAP_readonly); 504 if (err) 505 return err; 506 nr_sgl = nr_segments; 507 nr_segments = 0; 508 for (i = 0; i < nr_sgl; i++) { 509 n_segs = ring_req->seg[i].length / 510 sizeof(struct scsiif_request_segment); 511 if ((unsigned)ring_req->seg[i].offset + 512 (unsigned)ring_req->seg[i].length > PAGE_SIZE || 513 n_segs * sizeof(struct scsiif_request_segment) != 514 ring_req->seg[i].length) 515 return -EINVAL; 516 nr_segments += n_segs; 517 } 518 if (nr_segments > SG_ALL) { 519 DPRINTK("xen-pvscsi: invalid nr_seg = %d\n", 520 nr_segments); 521 return -EINVAL; 522 } 523 } 524 525 /* free of (sgl) in fast_flush_area()*/ 526 pending_req->sgl = kmalloc_array(nr_segments, 527 sizeof(struct scatterlist), GFP_KERNEL); 528 if (!pending_req->sgl) 529 return -ENOMEM; 530 531 sg_init_table(pending_req->sgl, nr_segments); 532 pending_req->n_sg = nr_segments; 533 534 flags = GNTMAP_host_map; 535 if (pending_req->sc_data_direction == DMA_TO_DEVICE) 536 flags |= GNTMAP_readonly; 537 538 pg = pending_req->pages + nr_sgl; 539 grant = pending_req->grant_handles + nr_sgl; 540 if (!nr_sgl) { 541 seg = ring_req->seg; 542 err = scsiback_gnttab_data_map_list(pending_req, seg, 543 pg, grant, nr_segments, flags); 544 if (err) 545 return err; 546 } else { 547 for (i = 0; i < nr_sgl; i++) { 548 seg = (struct scsiif_request_segment *)( 549 vaddr(pending_req, i) + ring_req->seg[i].offset); 550 n_segs = ring_req->seg[i].length / 551 sizeof(struct scsiif_request_segment); 552 err = scsiback_gnttab_data_map_list(pending_req, seg, 553 pg, grant, n_segs, flags); 554 if (err) 555 return err; 556 pg += n_segs; 557 grant += n_segs; 558 } 559 end_seg = vaddr(pending_req, 0) + ring_req->seg[0].offset; 560 seg = (struct scsiif_request_segment *)end_seg; 561 end_seg += ring_req->seg[0].length; 562 pg = pending_req->pages + nr_sgl; 563 } 564 565 for_each_sg(pending_req->sgl, sg, nr_segments, i) { 566 sg_set_page(sg, pg[i], seg->length, seg->offset); 567 pending_req->data_len += seg->length; 568 seg++; 569 if (nr_sgl && (unsigned long)seg >= end_seg) { 570 i_seg++; 571 end_seg = vaddr(pending_req, i_seg) + 572 ring_req->seg[i_seg].offset; 573 seg = (struct scsiif_request_segment *)end_seg; 574 end_seg += ring_req->seg[i_seg].length; 575 } 576 if (sg->offset >= PAGE_SIZE || 577 sg->length > PAGE_SIZE || 578 sg->offset + sg->length > PAGE_SIZE) 579 return -EINVAL; 580 } 581 582 return 0; 583 } 584 585 static void scsiback_disconnect(struct vscsibk_info *info) 586 { 587 wait_event(info->waiting_to_free, 588 atomic_read(&info->nr_unreplied_reqs) == 0); 589 590 unbind_from_irqhandler(info->irq, info); 591 info->irq = 0; 592 xenbus_unmap_ring_vfree(info->dev, info->ring.sring); 593 } 594 595 static void scsiback_device_action(struct vscsibk_pend *pending_req, 596 enum tcm_tmreq_table act, int tag) 597 { 598 int rc, err = FAILED; 599 struct scsiback_tpg *tpg = pending_req->v2p->tpg; 600 struct se_cmd *se_cmd = &pending_req->se_cmd; 601 struct scsiback_tmr *tmr; 602 603 tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL); 604 if (!tmr) 605 goto out; 606 607 init_waitqueue_head(&tmr->tmr_wait); 608 609 transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo, 610 tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, TCM_SIMPLE_TAG, 611 &pending_req->sense_buffer[0]); 612 613 rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL); 614 if (rc < 0) 615 goto out; 616 617 se_cmd->se_tmr_req->ref_task_tag = tag; 618 619 if (transport_lookup_tmr_lun(se_cmd, pending_req->v2p->lun) < 0) 620 goto out; 621 622 transport_generic_handle_tmr(se_cmd); 623 wait_event(tmr->tmr_wait, atomic_read(&tmr->tmr_complete)); 624 625 err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? 626 SUCCESS : FAILED; 627 628 out: 629 if (tmr) { 630 transport_generic_free_cmd(&pending_req->se_cmd, 1); 631 kfree(tmr); 632 } 633 634 scsiback_do_resp_with_sense(NULL, err, 0, pending_req); 635 636 kmem_cache_free(scsiback_cachep, pending_req); 637 } 638 639 /* 640 Perform virtual to physical translation 641 */ 642 static struct v2p_entry *scsiback_do_translation(struct vscsibk_info *info, 643 struct ids_tuple *v) 644 { 645 struct v2p_entry *entry; 646 struct list_head *head = &(info->v2p_entry_lists); 647 unsigned long flags; 648 649 spin_lock_irqsave(&info->v2p_lock, flags); 650 list_for_each_entry(entry, head, l) { 651 if ((entry->v.chn == v->chn) && 652 (entry->v.tgt == v->tgt) && 653 (entry->v.lun == v->lun)) { 654 kref_get(&entry->kref); 655 goto out; 656 } 657 } 658 entry = NULL; 659 660 out: 661 spin_unlock_irqrestore(&info->v2p_lock, flags); 662 return entry; 663 } 664 665 static int prepare_pending_reqs(struct vscsibk_info *info, 666 struct vscsiif_request *ring_req, 667 struct vscsibk_pend *pending_req) 668 { 669 struct v2p_entry *v2p; 670 struct ids_tuple vir; 671 672 pending_req->rqid = ring_req->rqid; 673 pending_req->info = info; 674 675 vir.chn = ring_req->channel; 676 vir.tgt = ring_req->id; 677 vir.lun = ring_req->lun; 678 679 v2p = scsiback_do_translation(info, &vir); 680 if (!v2p) { 681 pending_req->v2p = NULL; 682 DPRINTK("xen-pvscsi: doesn't exist.\n"); 683 return -ENODEV; 684 } 685 pending_req->v2p = v2p; 686 687 /* request range check from frontend */ 688 pending_req->sc_data_direction = ring_req->sc_data_direction; 689 if ((pending_req->sc_data_direction != DMA_BIDIRECTIONAL) && 690 (pending_req->sc_data_direction != DMA_TO_DEVICE) && 691 (pending_req->sc_data_direction != DMA_FROM_DEVICE) && 692 (pending_req->sc_data_direction != DMA_NONE)) { 693 DPRINTK("xen-pvscsi: invalid parameter data_dir = %d\n", 694 pending_req->sc_data_direction); 695 return -EINVAL; 696 } 697 698 pending_req->cmd_len = ring_req->cmd_len; 699 if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) { 700 DPRINTK("xen-pvscsi: invalid parameter cmd_len = %d\n", 701 pending_req->cmd_len); 702 return -EINVAL; 703 } 704 memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len); 705 706 return 0; 707 } 708 709 static int scsiback_do_cmd_fn(struct vscsibk_info *info) 710 { 711 struct vscsiif_back_ring *ring = &info->ring; 712 struct vscsiif_request *ring_req; 713 struct vscsibk_pend *pending_req; 714 RING_IDX rc, rp; 715 int err, more_to_do; 716 uint32_t result; 717 uint8_t act; 718 719 rc = ring->req_cons; 720 rp = ring->sring->req_prod; 721 rmb(); /* guest system is accessing ring, too */ 722 723 if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) { 724 rc = ring->rsp_prod_pvt; 725 pr_warn("xen-pvscsi: Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n", 726 info->domid, rp, rc, rp - rc); 727 info->ring_error = 1; 728 return 0; 729 } 730 731 while ((rc != rp)) { 732 if (RING_REQUEST_CONS_OVERFLOW(ring, rc)) 733 break; 734 pending_req = kmem_cache_alloc(scsiback_cachep, GFP_KERNEL); 735 if (!pending_req) 736 return 1; 737 738 ring_req = RING_GET_REQUEST(ring, rc); 739 ring->req_cons = ++rc; 740 741 act = ring_req->act; 742 err = prepare_pending_reqs(info, ring_req, pending_req); 743 if (err) { 744 switch (err) { 745 case -ENODEV: 746 result = DID_NO_CONNECT; 747 break; 748 default: 749 result = DRIVER_ERROR; 750 break; 751 } 752 scsiback_do_resp_with_sense(NULL, result << 24, 0, 753 pending_req); 754 kmem_cache_free(scsiback_cachep, pending_req); 755 return 1; 756 } 757 758 switch (act) { 759 case VSCSIIF_ACT_SCSI_CDB: 760 if (scsiback_gnttab_data_map(ring_req, pending_req)) { 761 scsiback_fast_flush_area(pending_req); 762 scsiback_do_resp_with_sense(NULL, 763 DRIVER_ERROR << 24, 0, pending_req); 764 kmem_cache_free(scsiback_cachep, pending_req); 765 } else { 766 scsiback_cmd_exec(pending_req); 767 } 768 break; 769 case VSCSIIF_ACT_SCSI_ABORT: 770 scsiback_device_action(pending_req, TMR_ABORT_TASK, 771 ring_req->ref_rqid); 772 break; 773 case VSCSIIF_ACT_SCSI_RESET: 774 scsiback_device_action(pending_req, TMR_LUN_RESET, 0); 775 break; 776 default: 777 pr_err_ratelimited("xen-pvscsi: invalid request\n"); 778 scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24, 779 0, pending_req); 780 kmem_cache_free(scsiback_cachep, pending_req); 781 break; 782 } 783 784 /* Yield point for this unbounded loop. */ 785 cond_resched(); 786 } 787 788 RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do); 789 return more_to_do; 790 } 791 792 static irqreturn_t scsiback_irq_fn(int irq, void *dev_id) 793 { 794 struct vscsibk_info *info = dev_id; 795 796 if (info->ring_error) 797 return IRQ_HANDLED; 798 799 while (scsiback_do_cmd_fn(info)) 800 cond_resched(); 801 802 return IRQ_HANDLED; 803 } 804 805 static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref, 806 evtchn_port_t evtchn) 807 { 808 void *area; 809 struct vscsiif_sring *sring; 810 int err; 811 812 if (info->irq) 813 return -1; 814 815 err = xenbus_map_ring_valloc(info->dev, ring_ref, &area); 816 if (err) 817 return err; 818 819 sring = (struct vscsiif_sring *)area; 820 BACK_RING_INIT(&info->ring, sring, PAGE_SIZE); 821 822 err = bind_interdomain_evtchn_to_irq(info->domid, evtchn); 823 if (err < 0) 824 goto unmap_page; 825 826 info->irq = err; 827 828 err = request_threaded_irq(info->irq, NULL, scsiback_irq_fn, 829 IRQF_ONESHOT, "vscsiif-backend", info); 830 if (err) 831 goto free_irq; 832 833 return 0; 834 835 free_irq: 836 unbind_from_irqhandler(info->irq, info); 837 info->irq = 0; 838 unmap_page: 839 xenbus_unmap_ring_vfree(info->dev, area); 840 841 return err; 842 } 843 844 static int scsiback_map(struct vscsibk_info *info) 845 { 846 struct xenbus_device *dev = info->dev; 847 unsigned int ring_ref, evtchn; 848 int err; 849 850 err = xenbus_gather(XBT_NIL, dev->otherend, 851 "ring-ref", "%u", &ring_ref, 852 "event-channel", "%u", &evtchn, NULL); 853 if (err) { 854 xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend); 855 return err; 856 } 857 858 return scsiback_init_sring(info, ring_ref, evtchn); 859 } 860 861 /* 862 Add a new translation entry 863 */ 864 static int scsiback_add_translation_entry(struct vscsibk_info *info, 865 char *phy, struct ids_tuple *v) 866 { 867 int err = 0; 868 struct v2p_entry *entry; 869 struct v2p_entry *new; 870 struct list_head *head = &(info->v2p_entry_lists); 871 unsigned long flags; 872 char *lunp; 873 unsigned int lun; 874 struct scsiback_tpg *tpg_entry, *tpg = NULL; 875 char *error = "doesn't exist"; 876 877 lunp = strrchr(phy, ':'); 878 if (!lunp) { 879 pr_err("xen-pvscsi: illegal format of physical device %s\n", 880 phy); 881 return -EINVAL; 882 } 883 *lunp = 0; 884 lunp++; 885 if (kstrtouint(lunp, 10, &lun) || lun >= TRANSPORT_MAX_LUNS_PER_TPG) { 886 pr_err("xen-pvscsi: lun number not valid: %s\n", lunp); 887 return -EINVAL; 888 } 889 890 mutex_lock(&scsiback_mutex); 891 list_for_each_entry(tpg_entry, &scsiback_list, tv_tpg_list) { 892 if (!strcmp(phy, tpg_entry->tport->tport_name) || 893 !strcmp(phy, tpg_entry->param_alias)) { 894 spin_lock(&tpg_entry->se_tpg.tpg_lun_lock); 895 if (tpg_entry->se_tpg.tpg_lun_list[lun]->lun_status == 896 TRANSPORT_LUN_STATUS_ACTIVE) { 897 if (!tpg_entry->tpg_nexus) 898 error = "nexus undefined"; 899 else 900 tpg = tpg_entry; 901 } 902 spin_unlock(&tpg_entry->se_tpg.tpg_lun_lock); 903 break; 904 } 905 } 906 if (tpg) { 907 mutex_lock(&tpg->tv_tpg_mutex); 908 tpg->tv_tpg_fe_count++; 909 mutex_unlock(&tpg->tv_tpg_mutex); 910 } 911 mutex_unlock(&scsiback_mutex); 912 913 if (!tpg) { 914 pr_err("xen-pvscsi: %s:%d %s\n", phy, lun, error); 915 return -ENODEV; 916 } 917 918 new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL); 919 if (new == NULL) { 920 err = -ENOMEM; 921 goto out_free; 922 } 923 924 spin_lock_irqsave(&info->v2p_lock, flags); 925 926 /* Check double assignment to identical virtual ID */ 927 list_for_each_entry(entry, head, l) { 928 if ((entry->v.chn == v->chn) && 929 (entry->v.tgt == v->tgt) && 930 (entry->v.lun == v->lun)) { 931 pr_warn("xen-pvscsi: Virtual ID is already used. Assignment was not performed.\n"); 932 err = -EEXIST; 933 goto out; 934 } 935 936 } 937 938 /* Create a new translation entry and add to the list */ 939 kref_init(&new->kref); 940 new->v = *v; 941 new->tpg = tpg; 942 new->lun = lun; 943 list_add_tail(&new->l, head); 944 945 out: 946 spin_unlock_irqrestore(&info->v2p_lock, flags); 947 948 out_free: 949 mutex_lock(&tpg->tv_tpg_mutex); 950 tpg->tv_tpg_fe_count--; 951 mutex_unlock(&tpg->tv_tpg_mutex); 952 953 if (err) 954 kfree(new); 955 956 return err; 957 } 958 959 static void __scsiback_del_translation_entry(struct v2p_entry *entry) 960 { 961 list_del(&entry->l); 962 kref_put(&entry->kref, scsiback_free_translation_entry); 963 } 964 965 /* 966 Delete the translation entry specfied 967 */ 968 static int scsiback_del_translation_entry(struct vscsibk_info *info, 969 struct ids_tuple *v) 970 { 971 struct v2p_entry *entry; 972 struct list_head *head = &(info->v2p_entry_lists); 973 unsigned long flags; 974 975 spin_lock_irqsave(&info->v2p_lock, flags); 976 /* Find out the translation entry specified */ 977 list_for_each_entry(entry, head, l) { 978 if ((entry->v.chn == v->chn) && 979 (entry->v.tgt == v->tgt) && 980 (entry->v.lun == v->lun)) { 981 goto found; 982 } 983 } 984 985 spin_unlock_irqrestore(&info->v2p_lock, flags); 986 return 1; 987 988 found: 989 /* Delete the translation entry specfied */ 990 __scsiback_del_translation_entry(entry); 991 992 spin_unlock_irqrestore(&info->v2p_lock, flags); 993 return 0; 994 } 995 996 static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state, 997 char *phy, struct ids_tuple *vir) 998 { 999 if (!scsiback_add_translation_entry(info, phy, vir)) { 1000 if (xenbus_printf(XBT_NIL, info->dev->nodename, state, 1001 "%d", XenbusStateInitialised)) { 1002 pr_err("xen-pvscsi: xenbus_printf error %s\n", state); 1003 scsiback_del_translation_entry(info, vir); 1004 } 1005 } else { 1006 xenbus_printf(XBT_NIL, info->dev->nodename, state, 1007 "%d", XenbusStateClosed); 1008 } 1009 } 1010 1011 static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state, 1012 struct ids_tuple *vir) 1013 { 1014 if (!scsiback_del_translation_entry(info, vir)) { 1015 if (xenbus_printf(XBT_NIL, info->dev->nodename, state, 1016 "%d", XenbusStateClosed)) 1017 pr_err("xen-pvscsi: xenbus_printf error %s\n", state); 1018 } 1019 } 1020 1021 #define VSCSIBACK_OP_ADD_OR_DEL_LUN 1 1022 #define VSCSIBACK_OP_UPDATEDEV_STATE 2 1023 1024 static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op, 1025 char *ent) 1026 { 1027 int err; 1028 struct ids_tuple vir; 1029 char *val; 1030 int device_state; 1031 char phy[VSCSI_NAMELEN]; 1032 char str[64]; 1033 char state[64]; 1034 struct xenbus_device *dev = info->dev; 1035 1036 /* read status */ 1037 snprintf(state, sizeof(state), "vscsi-devs/%s/state", ent); 1038 err = xenbus_scanf(XBT_NIL, dev->nodename, state, "%u", &device_state); 1039 if (XENBUS_EXIST_ERR(err)) 1040 return; 1041 1042 /* physical SCSI device */ 1043 snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent); 1044 val = xenbus_read(XBT_NIL, dev->nodename, str, NULL); 1045 if (IS_ERR(val)) { 1046 xenbus_printf(XBT_NIL, dev->nodename, state, 1047 "%d", XenbusStateClosed); 1048 return; 1049 } 1050 strlcpy(phy, val, VSCSI_NAMELEN); 1051 kfree(val); 1052 1053 /* virtual SCSI device */ 1054 snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", ent); 1055 err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u", 1056 &vir.hst, &vir.chn, &vir.tgt, &vir.lun); 1057 if (XENBUS_EXIST_ERR(err)) { 1058 xenbus_printf(XBT_NIL, dev->nodename, state, 1059 "%d", XenbusStateClosed); 1060 return; 1061 } 1062 1063 switch (op) { 1064 case VSCSIBACK_OP_ADD_OR_DEL_LUN: 1065 if (device_state == XenbusStateInitialising) 1066 scsiback_do_add_lun(info, state, phy, &vir); 1067 if (device_state == XenbusStateClosing) 1068 scsiback_do_del_lun(info, state, &vir); 1069 break; 1070 1071 case VSCSIBACK_OP_UPDATEDEV_STATE: 1072 if (device_state == XenbusStateInitialised) { 1073 /* modify vscsi-devs/dev-x/state */ 1074 if (xenbus_printf(XBT_NIL, dev->nodename, state, 1075 "%d", XenbusStateConnected)) { 1076 pr_err("xen-pvscsi: xenbus_printf error %s\n", 1077 str); 1078 scsiback_del_translation_entry(info, &vir); 1079 xenbus_printf(XBT_NIL, dev->nodename, state, 1080 "%d", XenbusStateClosed); 1081 } 1082 } 1083 break; 1084 /*When it is necessary, processing is added here.*/ 1085 default: 1086 break; 1087 } 1088 } 1089 1090 static void scsiback_do_lun_hotplug(struct vscsibk_info *info, int op) 1091 { 1092 int i; 1093 char **dir; 1094 unsigned int ndir = 0; 1095 1096 dir = xenbus_directory(XBT_NIL, info->dev->nodename, "vscsi-devs", 1097 &ndir); 1098 if (IS_ERR(dir)) 1099 return; 1100 1101 for (i = 0; i < ndir; i++) 1102 scsiback_do_1lun_hotplug(info, op, dir[i]); 1103 1104 kfree(dir); 1105 } 1106 1107 static void scsiback_frontend_changed(struct xenbus_device *dev, 1108 enum xenbus_state frontend_state) 1109 { 1110 struct vscsibk_info *info = dev_get_drvdata(&dev->dev); 1111 1112 switch (frontend_state) { 1113 case XenbusStateInitialising: 1114 break; 1115 1116 case XenbusStateInitialised: 1117 if (scsiback_map(info)) 1118 break; 1119 1120 scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); 1121 xenbus_switch_state(dev, XenbusStateConnected); 1122 break; 1123 1124 case XenbusStateConnected: 1125 scsiback_do_lun_hotplug(info, VSCSIBACK_OP_UPDATEDEV_STATE); 1126 1127 if (dev->state == XenbusStateConnected) 1128 break; 1129 1130 xenbus_switch_state(dev, XenbusStateConnected); 1131 break; 1132 1133 case XenbusStateClosing: 1134 if (info->irq) 1135 scsiback_disconnect(info); 1136 1137 xenbus_switch_state(dev, XenbusStateClosing); 1138 break; 1139 1140 case XenbusStateClosed: 1141 xenbus_switch_state(dev, XenbusStateClosed); 1142 if (xenbus_dev_is_online(dev)) 1143 break; 1144 /* fall through if not online */ 1145 case XenbusStateUnknown: 1146 device_unregister(&dev->dev); 1147 break; 1148 1149 case XenbusStateReconfiguring: 1150 scsiback_do_lun_hotplug(info, VSCSIBACK_OP_ADD_OR_DEL_LUN); 1151 xenbus_switch_state(dev, XenbusStateReconfigured); 1152 1153 break; 1154 1155 default: 1156 xenbus_dev_fatal(dev, -EINVAL, "saw state %d at frontend", 1157 frontend_state); 1158 break; 1159 } 1160 } 1161 1162 /* 1163 Release the translation entry specfied 1164 */ 1165 static void scsiback_release_translation_entry(struct vscsibk_info *info) 1166 { 1167 struct v2p_entry *entry, *tmp; 1168 struct list_head *head = &(info->v2p_entry_lists); 1169 unsigned long flags; 1170 1171 spin_lock_irqsave(&info->v2p_lock, flags); 1172 1173 list_for_each_entry_safe(entry, tmp, head, l) 1174 __scsiback_del_translation_entry(entry); 1175 1176 spin_unlock_irqrestore(&info->v2p_lock, flags); 1177 } 1178 1179 static int scsiback_remove(struct xenbus_device *dev) 1180 { 1181 struct vscsibk_info *info = dev_get_drvdata(&dev->dev); 1182 1183 if (info->irq) 1184 scsiback_disconnect(info); 1185 1186 scsiback_release_translation_entry(info); 1187 1188 dev_set_drvdata(&dev->dev, NULL); 1189 1190 return 0; 1191 } 1192 1193 static int scsiback_probe(struct xenbus_device *dev, 1194 const struct xenbus_device_id *id) 1195 { 1196 int err; 1197 1198 struct vscsibk_info *info = kzalloc(sizeof(struct vscsibk_info), 1199 GFP_KERNEL); 1200 1201 DPRINTK("%p %d\n", dev, dev->otherend_id); 1202 1203 if (!info) { 1204 xenbus_dev_fatal(dev, -ENOMEM, "allocating backend structure"); 1205 return -ENOMEM; 1206 } 1207 info->dev = dev; 1208 dev_set_drvdata(&dev->dev, info); 1209 1210 info->domid = dev->otherend_id; 1211 spin_lock_init(&info->ring_lock); 1212 info->ring_error = 0; 1213 atomic_set(&info->nr_unreplied_reqs, 0); 1214 init_waitqueue_head(&info->waiting_to_free); 1215 info->dev = dev; 1216 info->irq = 0; 1217 INIT_LIST_HEAD(&info->v2p_entry_lists); 1218 spin_lock_init(&info->v2p_lock); 1219 1220 err = xenbus_printf(XBT_NIL, dev->nodename, "feature-sg-grant", "%u", 1221 SG_ALL); 1222 if (err) 1223 xenbus_dev_error(dev, err, "writing feature-sg-grant"); 1224 1225 err = xenbus_switch_state(dev, XenbusStateInitWait); 1226 if (err) 1227 goto fail; 1228 1229 return 0; 1230 1231 fail: 1232 pr_warn("xen-pvscsi: %s failed\n", __func__); 1233 scsiback_remove(dev); 1234 1235 return err; 1236 } 1237 1238 static char *scsiback_dump_proto_id(struct scsiback_tport *tport) 1239 { 1240 switch (tport->tport_proto_id) { 1241 case SCSI_PROTOCOL_SAS: 1242 return "SAS"; 1243 case SCSI_PROTOCOL_FCP: 1244 return "FCP"; 1245 case SCSI_PROTOCOL_ISCSI: 1246 return "iSCSI"; 1247 default: 1248 break; 1249 } 1250 1251 return "Unknown"; 1252 } 1253 1254 static u8 scsiback_get_fabric_proto_ident(struct se_portal_group *se_tpg) 1255 { 1256 struct scsiback_tpg *tpg = container_of(se_tpg, 1257 struct scsiback_tpg, se_tpg); 1258 struct scsiback_tport *tport = tpg->tport; 1259 1260 switch (tport->tport_proto_id) { 1261 case SCSI_PROTOCOL_SAS: 1262 return sas_get_fabric_proto_ident(se_tpg); 1263 case SCSI_PROTOCOL_FCP: 1264 return fc_get_fabric_proto_ident(se_tpg); 1265 case SCSI_PROTOCOL_ISCSI: 1266 return iscsi_get_fabric_proto_ident(se_tpg); 1267 default: 1268 pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", 1269 tport->tport_proto_id); 1270 break; 1271 } 1272 1273 return sas_get_fabric_proto_ident(se_tpg); 1274 } 1275 1276 static char *scsiback_get_fabric_wwn(struct se_portal_group *se_tpg) 1277 { 1278 struct scsiback_tpg *tpg = container_of(se_tpg, 1279 struct scsiback_tpg, se_tpg); 1280 struct scsiback_tport *tport = tpg->tport; 1281 1282 return &tport->tport_name[0]; 1283 } 1284 1285 static u16 scsiback_get_tag(struct se_portal_group *se_tpg) 1286 { 1287 struct scsiback_tpg *tpg = container_of(se_tpg, 1288 struct scsiback_tpg, se_tpg); 1289 return tpg->tport_tpgt; 1290 } 1291 1292 static u32 scsiback_get_default_depth(struct se_portal_group *se_tpg) 1293 { 1294 return 1; 1295 } 1296 1297 static u32 1298 scsiback_get_pr_transport_id(struct se_portal_group *se_tpg, 1299 struct se_node_acl *se_nacl, 1300 struct t10_pr_registration *pr_reg, 1301 int *format_code, 1302 unsigned char *buf) 1303 { 1304 struct scsiback_tpg *tpg = container_of(se_tpg, 1305 struct scsiback_tpg, se_tpg); 1306 struct scsiback_tport *tport = tpg->tport; 1307 1308 switch (tport->tport_proto_id) { 1309 case SCSI_PROTOCOL_SAS: 1310 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 1311 format_code, buf); 1312 case SCSI_PROTOCOL_FCP: 1313 return fc_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 1314 format_code, buf); 1315 case SCSI_PROTOCOL_ISCSI: 1316 return iscsi_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 1317 format_code, buf); 1318 default: 1319 pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", 1320 tport->tport_proto_id); 1321 break; 1322 } 1323 1324 return sas_get_pr_transport_id(se_tpg, se_nacl, pr_reg, 1325 format_code, buf); 1326 } 1327 1328 static u32 1329 scsiback_get_pr_transport_id_len(struct se_portal_group *se_tpg, 1330 struct se_node_acl *se_nacl, 1331 struct t10_pr_registration *pr_reg, 1332 int *format_code) 1333 { 1334 struct scsiback_tpg *tpg = container_of(se_tpg, 1335 struct scsiback_tpg, se_tpg); 1336 struct scsiback_tport *tport = tpg->tport; 1337 1338 switch (tport->tport_proto_id) { 1339 case SCSI_PROTOCOL_SAS: 1340 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 1341 format_code); 1342 case SCSI_PROTOCOL_FCP: 1343 return fc_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 1344 format_code); 1345 case SCSI_PROTOCOL_ISCSI: 1346 return iscsi_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 1347 format_code); 1348 default: 1349 pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", 1350 tport->tport_proto_id); 1351 break; 1352 } 1353 1354 return sas_get_pr_transport_id_len(se_tpg, se_nacl, pr_reg, 1355 format_code); 1356 } 1357 1358 static char * 1359 scsiback_parse_pr_out_transport_id(struct se_portal_group *se_tpg, 1360 const char *buf, 1361 u32 *out_tid_len, 1362 char **port_nexus_ptr) 1363 { 1364 struct scsiback_tpg *tpg = container_of(se_tpg, 1365 struct scsiback_tpg, se_tpg); 1366 struct scsiback_tport *tport = tpg->tport; 1367 1368 switch (tport->tport_proto_id) { 1369 case SCSI_PROTOCOL_SAS: 1370 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 1371 port_nexus_ptr); 1372 case SCSI_PROTOCOL_FCP: 1373 return fc_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 1374 port_nexus_ptr); 1375 case SCSI_PROTOCOL_ISCSI: 1376 return iscsi_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 1377 port_nexus_ptr); 1378 default: 1379 pr_err("Unknown tport_proto_id: 0x%02x, using SAS emulation\n", 1380 tport->tport_proto_id); 1381 break; 1382 } 1383 1384 return sas_parse_pr_out_transport_id(se_tpg, buf, out_tid_len, 1385 port_nexus_ptr); 1386 } 1387 1388 static struct se_wwn * 1389 scsiback_make_tport(struct target_fabric_configfs *tf, 1390 struct config_group *group, 1391 const char *name) 1392 { 1393 struct scsiback_tport *tport; 1394 char *ptr; 1395 u64 wwpn = 0; 1396 int off = 0; 1397 1398 tport = kzalloc(sizeof(struct scsiback_tport), GFP_KERNEL); 1399 if (!tport) 1400 return ERR_PTR(-ENOMEM); 1401 1402 tport->tport_wwpn = wwpn; 1403 /* 1404 * Determine the emulated Protocol Identifier and Target Port Name 1405 * based on the incoming configfs directory name. 1406 */ 1407 ptr = strstr(name, "naa."); 1408 if (ptr) { 1409 tport->tport_proto_id = SCSI_PROTOCOL_SAS; 1410 goto check_len; 1411 } 1412 ptr = strstr(name, "fc."); 1413 if (ptr) { 1414 tport->tport_proto_id = SCSI_PROTOCOL_FCP; 1415 off = 3; /* Skip over "fc." */ 1416 goto check_len; 1417 } 1418 ptr = strstr(name, "iqn."); 1419 if (ptr) { 1420 tport->tport_proto_id = SCSI_PROTOCOL_ISCSI; 1421 goto check_len; 1422 } 1423 1424 pr_err("Unable to locate prefix for emulated Target Port: %s\n", name); 1425 kfree(tport); 1426 return ERR_PTR(-EINVAL); 1427 1428 check_len: 1429 if (strlen(name) >= VSCSI_NAMELEN) { 1430 pr_err("Emulated %s Address: %s, exceeds max: %d\n", name, 1431 scsiback_dump_proto_id(tport), VSCSI_NAMELEN); 1432 kfree(tport); 1433 return ERR_PTR(-EINVAL); 1434 } 1435 snprintf(&tport->tport_name[0], VSCSI_NAMELEN, "%s", &name[off]); 1436 1437 pr_debug("xen-pvscsi: Allocated emulated Target %s Address: %s\n", 1438 scsiback_dump_proto_id(tport), name); 1439 1440 return &tport->tport_wwn; 1441 } 1442 1443 static void scsiback_drop_tport(struct se_wwn *wwn) 1444 { 1445 struct scsiback_tport *tport = container_of(wwn, 1446 struct scsiback_tport, tport_wwn); 1447 1448 pr_debug("xen-pvscsi: Deallocating emulated Target %s Address: %s\n", 1449 scsiback_dump_proto_id(tport), tport->tport_name); 1450 1451 kfree(tport); 1452 } 1453 1454 static struct se_node_acl * 1455 scsiback_alloc_fabric_acl(struct se_portal_group *se_tpg) 1456 { 1457 return kzalloc(sizeof(struct se_node_acl), GFP_KERNEL); 1458 } 1459 1460 static void 1461 scsiback_release_fabric_acl(struct se_portal_group *se_tpg, 1462 struct se_node_acl *se_nacl) 1463 { 1464 kfree(se_nacl); 1465 } 1466 1467 static u32 scsiback_tpg_get_inst_index(struct se_portal_group *se_tpg) 1468 { 1469 return 1; 1470 } 1471 1472 static int scsiback_check_stop_free(struct se_cmd *se_cmd) 1473 { 1474 /* 1475 * Do not release struct se_cmd's containing a valid TMR 1476 * pointer. These will be released directly in scsiback_device_action() 1477 * with transport_generic_free_cmd(). 1478 */ 1479 if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 1480 return 0; 1481 1482 transport_generic_free_cmd(se_cmd, 0); 1483 return 1; 1484 } 1485 1486 static void scsiback_release_cmd(struct se_cmd *se_cmd) 1487 { 1488 struct vscsibk_pend *pending_req = container_of(se_cmd, 1489 struct vscsibk_pend, se_cmd); 1490 1491 kmem_cache_free(scsiback_cachep, pending_req); 1492 } 1493 1494 static int scsiback_shutdown_session(struct se_session *se_sess) 1495 { 1496 return 0; 1497 } 1498 1499 static void scsiback_close_session(struct se_session *se_sess) 1500 { 1501 } 1502 1503 static u32 scsiback_sess_get_index(struct se_session *se_sess) 1504 { 1505 return 0; 1506 } 1507 1508 static int scsiback_write_pending(struct se_cmd *se_cmd) 1509 { 1510 /* Go ahead and process the write immediately */ 1511 target_execute_cmd(se_cmd); 1512 1513 return 0; 1514 } 1515 1516 static int scsiback_write_pending_status(struct se_cmd *se_cmd) 1517 { 1518 return 0; 1519 } 1520 1521 static void scsiback_set_default_node_attrs(struct se_node_acl *nacl) 1522 { 1523 } 1524 1525 static u32 scsiback_get_task_tag(struct se_cmd *se_cmd) 1526 { 1527 struct vscsibk_pend *pending_req = container_of(se_cmd, 1528 struct vscsibk_pend, se_cmd); 1529 1530 return pending_req->rqid; 1531 } 1532 1533 static int scsiback_get_cmd_state(struct se_cmd *se_cmd) 1534 { 1535 return 0; 1536 } 1537 1538 static int scsiback_queue_data_in(struct se_cmd *se_cmd) 1539 { 1540 struct vscsibk_pend *pending_req = container_of(se_cmd, 1541 struct vscsibk_pend, se_cmd); 1542 1543 pending_req->result = SAM_STAT_GOOD; 1544 scsiback_cmd_done(pending_req); 1545 return 0; 1546 } 1547 1548 static int scsiback_queue_status(struct se_cmd *se_cmd) 1549 { 1550 struct vscsibk_pend *pending_req = container_of(se_cmd, 1551 struct vscsibk_pend, se_cmd); 1552 1553 if (se_cmd->sense_buffer && 1554 ((se_cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) || 1555 (se_cmd->se_cmd_flags & SCF_EMULATED_TASK_SENSE))) 1556 pending_req->result = (DRIVER_SENSE << 24) | 1557 SAM_STAT_CHECK_CONDITION; 1558 else 1559 pending_req->result = se_cmd->scsi_status; 1560 1561 scsiback_cmd_done(pending_req); 1562 return 0; 1563 } 1564 1565 static void scsiback_queue_tm_rsp(struct se_cmd *se_cmd) 1566 { 1567 struct se_tmr_req *se_tmr = se_cmd->se_tmr_req; 1568 struct scsiback_tmr *tmr = se_tmr->fabric_tmr_ptr; 1569 1570 atomic_set(&tmr->tmr_complete, 1); 1571 wake_up(&tmr->tmr_wait); 1572 } 1573 1574 static void scsiback_aborted_task(struct se_cmd *se_cmd) 1575 { 1576 } 1577 1578 static ssize_t scsiback_tpg_param_show_alias(struct se_portal_group *se_tpg, 1579 char *page) 1580 { 1581 struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, 1582 se_tpg); 1583 ssize_t rb; 1584 1585 mutex_lock(&tpg->tv_tpg_mutex); 1586 rb = snprintf(page, PAGE_SIZE, "%s\n", tpg->param_alias); 1587 mutex_unlock(&tpg->tv_tpg_mutex); 1588 1589 return rb; 1590 } 1591 1592 static ssize_t scsiback_tpg_param_store_alias(struct se_portal_group *se_tpg, 1593 const char *page, size_t count) 1594 { 1595 struct scsiback_tpg *tpg = container_of(se_tpg, struct scsiback_tpg, 1596 se_tpg); 1597 int len; 1598 1599 if (strlen(page) >= VSCSI_NAMELEN) { 1600 pr_err("param alias: %s, exceeds max: %d\n", page, 1601 VSCSI_NAMELEN); 1602 return -EINVAL; 1603 } 1604 1605 mutex_lock(&tpg->tv_tpg_mutex); 1606 len = snprintf(tpg->param_alias, VSCSI_NAMELEN, "%s", page); 1607 if (tpg->param_alias[len - 1] == '\n') 1608 tpg->param_alias[len - 1] = '\0'; 1609 mutex_unlock(&tpg->tv_tpg_mutex); 1610 1611 return count; 1612 } 1613 1614 TF_TPG_PARAM_ATTR(scsiback, alias, S_IRUGO | S_IWUSR); 1615 1616 static struct configfs_attribute *scsiback_param_attrs[] = { 1617 &scsiback_tpg_param_alias.attr, 1618 NULL, 1619 }; 1620 1621 static int scsiback_make_nexus(struct scsiback_tpg *tpg, 1622 const char *name) 1623 { 1624 struct se_portal_group *se_tpg; 1625 struct se_session *se_sess; 1626 struct scsiback_nexus *tv_nexus; 1627 1628 mutex_lock(&tpg->tv_tpg_mutex); 1629 if (tpg->tpg_nexus) { 1630 mutex_unlock(&tpg->tv_tpg_mutex); 1631 pr_debug("tpg->tpg_nexus already exists\n"); 1632 return -EEXIST; 1633 } 1634 se_tpg = &tpg->se_tpg; 1635 1636 tv_nexus = kzalloc(sizeof(struct scsiback_nexus), GFP_KERNEL); 1637 if (!tv_nexus) { 1638 mutex_unlock(&tpg->tv_tpg_mutex); 1639 return -ENOMEM; 1640 } 1641 /* 1642 * Initialize the struct se_session pointer 1643 */ 1644 tv_nexus->tvn_se_sess = transport_init_session(TARGET_PROT_NORMAL); 1645 if (IS_ERR(tv_nexus->tvn_se_sess)) { 1646 mutex_unlock(&tpg->tv_tpg_mutex); 1647 kfree(tv_nexus); 1648 return -ENOMEM; 1649 } 1650 se_sess = tv_nexus->tvn_se_sess; 1651 /* 1652 * Since we are running in 'demo mode' this call with generate a 1653 * struct se_node_acl for the scsiback struct se_portal_group with 1654 * the SCSI Initiator port name of the passed configfs group 'name'. 1655 */ 1656 tv_nexus->tvn_se_sess->se_node_acl = core_tpg_check_initiator_node_acl( 1657 se_tpg, (unsigned char *)name); 1658 if (!tv_nexus->tvn_se_sess->se_node_acl) { 1659 mutex_unlock(&tpg->tv_tpg_mutex); 1660 pr_debug("core_tpg_check_initiator_node_acl() failed for %s\n", 1661 name); 1662 goto out; 1663 } 1664 /* 1665 * Now register the TCM pvscsi virtual I_T Nexus as active with the 1666 * call to __transport_register_session() 1667 */ 1668 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, 1669 tv_nexus->tvn_se_sess, tv_nexus); 1670 tpg->tpg_nexus = tv_nexus; 1671 1672 mutex_unlock(&tpg->tv_tpg_mutex); 1673 return 0; 1674 1675 out: 1676 transport_free_session(se_sess); 1677 kfree(tv_nexus); 1678 return -ENOMEM; 1679 } 1680 1681 static int scsiback_drop_nexus(struct scsiback_tpg *tpg) 1682 { 1683 struct se_session *se_sess; 1684 struct scsiback_nexus *tv_nexus; 1685 1686 mutex_lock(&tpg->tv_tpg_mutex); 1687 tv_nexus = tpg->tpg_nexus; 1688 if (!tv_nexus) { 1689 mutex_unlock(&tpg->tv_tpg_mutex); 1690 return -ENODEV; 1691 } 1692 1693 se_sess = tv_nexus->tvn_se_sess; 1694 if (!se_sess) { 1695 mutex_unlock(&tpg->tv_tpg_mutex); 1696 return -ENODEV; 1697 } 1698 1699 if (tpg->tv_tpg_port_count != 0) { 1700 mutex_unlock(&tpg->tv_tpg_mutex); 1701 pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG port count: %d\n", 1702 tpg->tv_tpg_port_count); 1703 return -EBUSY; 1704 } 1705 1706 if (tpg->tv_tpg_fe_count != 0) { 1707 mutex_unlock(&tpg->tv_tpg_mutex); 1708 pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG frontend count: %d\n", 1709 tpg->tv_tpg_fe_count); 1710 return -EBUSY; 1711 } 1712 1713 pr_debug("xen-pvscsi: Removing I_T Nexus to emulated %s Initiator Port: %s\n", 1714 scsiback_dump_proto_id(tpg->tport), 1715 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1716 1717 /* 1718 * Release the SCSI I_T Nexus to the emulated xen-pvscsi Target Port 1719 */ 1720 transport_deregister_session(tv_nexus->tvn_se_sess); 1721 tpg->tpg_nexus = NULL; 1722 mutex_unlock(&tpg->tv_tpg_mutex); 1723 1724 kfree(tv_nexus); 1725 return 0; 1726 } 1727 1728 static ssize_t scsiback_tpg_show_nexus(struct se_portal_group *se_tpg, 1729 char *page) 1730 { 1731 struct scsiback_tpg *tpg = container_of(se_tpg, 1732 struct scsiback_tpg, se_tpg); 1733 struct scsiback_nexus *tv_nexus; 1734 ssize_t ret; 1735 1736 mutex_lock(&tpg->tv_tpg_mutex); 1737 tv_nexus = tpg->tpg_nexus; 1738 if (!tv_nexus) { 1739 mutex_unlock(&tpg->tv_tpg_mutex); 1740 return -ENODEV; 1741 } 1742 ret = snprintf(page, PAGE_SIZE, "%s\n", 1743 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1744 mutex_unlock(&tpg->tv_tpg_mutex); 1745 1746 return ret; 1747 } 1748 1749 static ssize_t scsiback_tpg_store_nexus(struct se_portal_group *se_tpg, 1750 const char *page, 1751 size_t count) 1752 { 1753 struct scsiback_tpg *tpg = container_of(se_tpg, 1754 struct scsiback_tpg, se_tpg); 1755 struct scsiback_tport *tport_wwn = tpg->tport; 1756 unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr; 1757 int ret; 1758 /* 1759 * Shutdown the active I_T nexus if 'NULL' is passed.. 1760 */ 1761 if (!strncmp(page, "NULL", 4)) { 1762 ret = scsiback_drop_nexus(tpg); 1763 return (!ret) ? count : ret; 1764 } 1765 /* 1766 * Otherwise make sure the passed virtual Initiator port WWN matches 1767 * the fabric protocol_id set in scsiback_make_tport(), and call 1768 * scsiback_make_nexus(). 1769 */ 1770 if (strlen(page) >= VSCSI_NAMELEN) { 1771 pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n", 1772 page, VSCSI_NAMELEN); 1773 return -EINVAL; 1774 } 1775 snprintf(&i_port[0], VSCSI_NAMELEN, "%s", page); 1776 1777 ptr = strstr(i_port, "naa."); 1778 if (ptr) { 1779 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { 1780 pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n", 1781 i_port, scsiback_dump_proto_id(tport_wwn)); 1782 return -EINVAL; 1783 } 1784 port_ptr = &i_port[0]; 1785 goto check_newline; 1786 } 1787 ptr = strstr(i_port, "fc."); 1788 if (ptr) { 1789 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { 1790 pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n", 1791 i_port, scsiback_dump_proto_id(tport_wwn)); 1792 return -EINVAL; 1793 } 1794 port_ptr = &i_port[3]; /* Skip over "fc." */ 1795 goto check_newline; 1796 } 1797 ptr = strstr(i_port, "iqn."); 1798 if (ptr) { 1799 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { 1800 pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n", 1801 i_port, scsiback_dump_proto_id(tport_wwn)); 1802 return -EINVAL; 1803 } 1804 port_ptr = &i_port[0]; 1805 goto check_newline; 1806 } 1807 pr_err("Unable to locate prefix for emulated Initiator Port: %s\n", 1808 i_port); 1809 return -EINVAL; 1810 /* 1811 * Clear any trailing newline for the NAA WWN 1812 */ 1813 check_newline: 1814 if (i_port[strlen(i_port) - 1] == '\n') 1815 i_port[strlen(i_port) - 1] = '\0'; 1816 1817 ret = scsiback_make_nexus(tpg, port_ptr); 1818 if (ret < 0) 1819 return ret; 1820 1821 return count; 1822 } 1823 1824 TF_TPG_BASE_ATTR(scsiback, nexus, S_IRUGO | S_IWUSR); 1825 1826 static struct configfs_attribute *scsiback_tpg_attrs[] = { 1827 &scsiback_tpg_nexus.attr, 1828 NULL, 1829 }; 1830 1831 static ssize_t 1832 scsiback_wwn_show_attr_version(struct target_fabric_configfs *tf, 1833 char *page) 1834 { 1835 return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on " 1836 UTS_RELEASE"\n", 1837 VSCSI_VERSION, utsname()->sysname, utsname()->machine); 1838 } 1839 1840 TF_WWN_ATTR_RO(scsiback, version); 1841 1842 static struct configfs_attribute *scsiback_wwn_attrs[] = { 1843 &scsiback_wwn_version.attr, 1844 NULL, 1845 }; 1846 1847 static char *scsiback_get_fabric_name(void) 1848 { 1849 return "xen-pvscsi"; 1850 } 1851 1852 static int scsiback_port_link(struct se_portal_group *se_tpg, 1853 struct se_lun *lun) 1854 { 1855 struct scsiback_tpg *tpg = container_of(se_tpg, 1856 struct scsiback_tpg, se_tpg); 1857 1858 mutex_lock(&tpg->tv_tpg_mutex); 1859 tpg->tv_tpg_port_count++; 1860 mutex_unlock(&tpg->tv_tpg_mutex); 1861 1862 return 0; 1863 } 1864 1865 static void scsiback_port_unlink(struct se_portal_group *se_tpg, 1866 struct se_lun *lun) 1867 { 1868 struct scsiback_tpg *tpg = container_of(se_tpg, 1869 struct scsiback_tpg, se_tpg); 1870 1871 mutex_lock(&tpg->tv_tpg_mutex); 1872 tpg->tv_tpg_port_count--; 1873 mutex_unlock(&tpg->tv_tpg_mutex); 1874 } 1875 1876 static struct se_portal_group * 1877 scsiback_make_tpg(struct se_wwn *wwn, 1878 struct config_group *group, 1879 const char *name) 1880 { 1881 struct scsiback_tport *tport = container_of(wwn, 1882 struct scsiback_tport, tport_wwn); 1883 1884 struct scsiback_tpg *tpg; 1885 u16 tpgt; 1886 int ret; 1887 1888 if (strstr(name, "tpgt_") != name) 1889 return ERR_PTR(-EINVAL); 1890 ret = kstrtou16(name + 5, 10, &tpgt); 1891 if (ret) 1892 return ERR_PTR(ret); 1893 1894 tpg = kzalloc(sizeof(struct scsiback_tpg), GFP_KERNEL); 1895 if (!tpg) 1896 return ERR_PTR(-ENOMEM); 1897 1898 mutex_init(&tpg->tv_tpg_mutex); 1899 INIT_LIST_HEAD(&tpg->tv_tpg_list); 1900 INIT_LIST_HEAD(&tpg->info_list); 1901 tpg->tport = tport; 1902 tpg->tport_tpgt = tpgt; 1903 1904 ret = core_tpg_register(&scsiback_fabric_configfs->tf_ops, wwn, 1905 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL); 1906 if (ret < 0) { 1907 kfree(tpg); 1908 return NULL; 1909 } 1910 mutex_lock(&scsiback_mutex); 1911 list_add_tail(&tpg->tv_tpg_list, &scsiback_list); 1912 mutex_unlock(&scsiback_mutex); 1913 1914 return &tpg->se_tpg; 1915 } 1916 1917 static void scsiback_drop_tpg(struct se_portal_group *se_tpg) 1918 { 1919 struct scsiback_tpg *tpg = container_of(se_tpg, 1920 struct scsiback_tpg, se_tpg); 1921 1922 mutex_lock(&scsiback_mutex); 1923 list_del(&tpg->tv_tpg_list); 1924 mutex_unlock(&scsiback_mutex); 1925 /* 1926 * Release the virtual I_T Nexus for this xen-pvscsi TPG 1927 */ 1928 scsiback_drop_nexus(tpg); 1929 /* 1930 * Deregister the se_tpg from TCM.. 1931 */ 1932 core_tpg_deregister(se_tpg); 1933 kfree(tpg); 1934 } 1935 1936 static int scsiback_check_true(struct se_portal_group *se_tpg) 1937 { 1938 return 1; 1939 } 1940 1941 static int scsiback_check_false(struct se_portal_group *se_tpg) 1942 { 1943 return 0; 1944 } 1945 1946 static struct target_core_fabric_ops scsiback_ops = { 1947 .get_fabric_name = scsiback_get_fabric_name, 1948 .get_fabric_proto_ident = scsiback_get_fabric_proto_ident, 1949 .tpg_get_wwn = scsiback_get_fabric_wwn, 1950 .tpg_get_tag = scsiback_get_tag, 1951 .tpg_get_default_depth = scsiback_get_default_depth, 1952 .tpg_get_pr_transport_id = scsiback_get_pr_transport_id, 1953 .tpg_get_pr_transport_id_len = scsiback_get_pr_transport_id_len, 1954 .tpg_parse_pr_out_transport_id = scsiback_parse_pr_out_transport_id, 1955 .tpg_check_demo_mode = scsiback_check_true, 1956 .tpg_check_demo_mode_cache = scsiback_check_true, 1957 .tpg_check_demo_mode_write_protect = scsiback_check_false, 1958 .tpg_check_prod_mode_write_protect = scsiback_check_false, 1959 .tpg_alloc_fabric_acl = scsiback_alloc_fabric_acl, 1960 .tpg_release_fabric_acl = scsiback_release_fabric_acl, 1961 .tpg_get_inst_index = scsiback_tpg_get_inst_index, 1962 .check_stop_free = scsiback_check_stop_free, 1963 .release_cmd = scsiback_release_cmd, 1964 .put_session = NULL, 1965 .shutdown_session = scsiback_shutdown_session, 1966 .close_session = scsiback_close_session, 1967 .sess_get_index = scsiback_sess_get_index, 1968 .sess_get_initiator_sid = NULL, 1969 .write_pending = scsiback_write_pending, 1970 .write_pending_status = scsiback_write_pending_status, 1971 .set_default_node_attributes = scsiback_set_default_node_attrs, 1972 .get_task_tag = scsiback_get_task_tag, 1973 .get_cmd_state = scsiback_get_cmd_state, 1974 .queue_data_in = scsiback_queue_data_in, 1975 .queue_status = scsiback_queue_status, 1976 .queue_tm_rsp = scsiback_queue_tm_rsp, 1977 .aborted_task = scsiback_aborted_task, 1978 /* 1979 * Setup callers for generic logic in target_core_fabric_configfs.c 1980 */ 1981 .fabric_make_wwn = scsiback_make_tport, 1982 .fabric_drop_wwn = scsiback_drop_tport, 1983 .fabric_make_tpg = scsiback_make_tpg, 1984 .fabric_drop_tpg = scsiback_drop_tpg, 1985 .fabric_post_link = scsiback_port_link, 1986 .fabric_pre_unlink = scsiback_port_unlink, 1987 .fabric_make_np = NULL, 1988 .fabric_drop_np = NULL, 1989 #if 0 1990 .fabric_make_nodeacl = scsiback_make_nodeacl, 1991 .fabric_drop_nodeacl = scsiback_drop_nodeacl, 1992 #endif 1993 }; 1994 1995 static int scsiback_register_configfs(void) 1996 { 1997 struct target_fabric_configfs *fabric; 1998 int ret; 1999 2000 pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n", 2001 VSCSI_VERSION, utsname()->sysname, utsname()->machine); 2002 /* 2003 * Register the top level struct config_item_type with TCM core 2004 */ 2005 fabric = target_fabric_configfs_init(THIS_MODULE, "xen-pvscsi"); 2006 if (IS_ERR(fabric)) 2007 return PTR_ERR(fabric); 2008 2009 /* 2010 * Setup fabric->tf_ops from our local scsiback_ops 2011 */ 2012 fabric->tf_ops = scsiback_ops; 2013 /* 2014 * Setup default attribute lists for various fabric->tf_cit_tmpl 2015 */ 2016 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = scsiback_wwn_attrs; 2017 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = scsiback_tpg_attrs; 2018 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL; 2019 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = scsiback_param_attrs; 2020 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL; 2021 fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL; 2022 fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL; 2023 fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL; 2024 fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL; 2025 /* 2026 * Register the fabric for use within TCM 2027 */ 2028 ret = target_fabric_configfs_register(fabric); 2029 if (ret < 0) { 2030 target_fabric_configfs_free(fabric); 2031 return ret; 2032 } 2033 /* 2034 * Setup our local pointer to *fabric 2035 */ 2036 scsiback_fabric_configfs = fabric; 2037 pr_debug("xen-pvscsi: Set fabric -> scsiback_fabric_configfs\n"); 2038 return 0; 2039 }; 2040 2041 static void scsiback_deregister_configfs(void) 2042 { 2043 if (!scsiback_fabric_configfs) 2044 return; 2045 2046 target_fabric_configfs_deregister(scsiback_fabric_configfs); 2047 scsiback_fabric_configfs = NULL; 2048 pr_debug("xen-pvscsi: Cleared scsiback_fabric_configfs\n"); 2049 }; 2050 2051 static const struct xenbus_device_id scsiback_ids[] = { 2052 { "vscsi" }, 2053 { "" } 2054 }; 2055 2056 static struct xenbus_driver scsiback_driver = { 2057 .ids = scsiback_ids, 2058 .probe = scsiback_probe, 2059 .remove = scsiback_remove, 2060 .otherend_changed = scsiback_frontend_changed 2061 }; 2062 2063 static void scsiback_init_pend(void *p) 2064 { 2065 struct vscsibk_pend *pend = p; 2066 int i; 2067 2068 memset(pend, 0, sizeof(*pend)); 2069 for (i = 0; i < VSCSI_MAX_GRANTS; i++) 2070 pend->grant_handles[i] = SCSIBACK_INVALID_HANDLE; 2071 } 2072 2073 static int __init scsiback_init(void) 2074 { 2075 int ret; 2076 2077 if (!xen_domain()) 2078 return -ENODEV; 2079 2080 scsiback_cachep = kmem_cache_create("vscsiif_cache", 2081 sizeof(struct vscsibk_pend), 0, 0, scsiback_init_pend); 2082 if (!scsiback_cachep) 2083 return -ENOMEM; 2084 2085 ret = xenbus_register_backend(&scsiback_driver); 2086 if (ret) 2087 goto out_cache_destroy; 2088 2089 ret = scsiback_register_configfs(); 2090 if (ret) 2091 goto out_unregister_xenbus; 2092 2093 return 0; 2094 2095 out_unregister_xenbus: 2096 xenbus_unregister_driver(&scsiback_driver); 2097 out_cache_destroy: 2098 kmem_cache_destroy(scsiback_cachep); 2099 pr_err("xen-pvscsi: %s: error %d\n", __func__, ret); 2100 return ret; 2101 } 2102 2103 static void __exit scsiback_exit(void) 2104 { 2105 struct page *page; 2106 2107 while (free_pages_num) { 2108 if (get_free_page(&page)) 2109 BUG(); 2110 gnttab_free_pages(1, &page); 2111 } 2112 scsiback_deregister_configfs(); 2113 xenbus_unregister_driver(&scsiback_driver); 2114 kmem_cache_destroy(scsiback_cachep); 2115 } 2116 2117 module_init(scsiback_init); 2118 module_exit(scsiback_exit); 2119 2120 MODULE_DESCRIPTION("Xen SCSI backend driver"); 2121 MODULE_LICENSE("Dual BSD/GPL"); 2122 MODULE_ALIAS("xen-backend:vscsi"); 2123 MODULE_AUTHOR("Juergen Gross <jgross@suse.com>"); 2124