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