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_dbg.h> 51#include <scsi/scsi_eh.h> 52#include <scsi/scsi_tcq.h> 53 54#include <target/target_core_base.h> 55#include <target/target_core_fabric.h> 56#include <target/target_core_configfs.h> 57#include <target/target_core_fabric_configfs.h> 58 59#include <asm/hypervisor.h> 60 61#include <xen/xen.h> 62#include <xen/balloon.h> 63#include <xen/events.h> 64#include <xen/xenbus.h> 65#include <xen/grant_table.h> 66#include <xen/page.h> 67 68#include <xen/interface/grant_table.h> 69#include <xen/interface/io/vscsiif.h> 70 71#define DPRINTK(_f, _a...) \ 72 pr_debug("(file=%s, line=%d) " _f, __FILE__ , __LINE__ , ## _a) 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); 206 207/* Local pointer to allocated TCM configfs fabric module */ 208static struct target_fabric_configfs *scsiback_fabric_configfs; 209 210static void scsiback_get(struct vscsibk_info *info) 211{ 212 atomic_inc(&info->nr_unreplied_reqs); 213} 214 215static void scsiback_put(struct vscsibk_info *info) 216{ 217 if (atomic_dec_and_test(&info->nr_unreplied_reqs)) 218 wake_up(&info->waiting_to_free); 219} 220 221static void put_free_pages(struct page **page, int num) 222{ 223 unsigned long flags; 224 int i = free_pages_num + num, n = num; 225 226 if (num == 0) 227 return; 228 if (i > scsiback_max_buffer_pages) { 229 n = min(num, i - scsiback_max_buffer_pages); 230 free_xenballooned_pages(n, page + num - n); 231 n = num - n; 232 } 233 spin_lock_irqsave(&free_pages_lock, flags); 234 for (i = 0; i < n; i++) 235 list_add(&page[i]->lru, &scsiback_free_pages); 236 free_pages_num += n; 237 spin_unlock_irqrestore(&free_pages_lock, flags); 238} 239 240static int get_free_page(struct page **page) 241{ 242 unsigned long flags; 243 244 spin_lock_irqsave(&free_pages_lock, flags); 245 if (list_empty(&scsiback_free_pages)) { 246 spin_unlock_irqrestore(&free_pages_lock, flags); 247 return alloc_xenballooned_pages(1, page, false); 248 } 249 page[0] = list_first_entry(&scsiback_free_pages, struct page, lru); 250 list_del(&page[0]->lru); 251 free_pages_num--; 252 spin_unlock_irqrestore(&free_pages_lock, flags); 253 return 0; 254} 255 256static unsigned long vaddr_page(struct page *page) 257{ 258 unsigned long pfn = page_to_pfn(page); 259 260 return (unsigned long)pfn_to_kaddr(pfn); 261} 262 263static unsigned long vaddr(struct vscsibk_pend *req, int seg) 264{ 265 return vaddr_page(req->pages[seg]); 266} 267 268static void scsiback_print_status(char *sense_buffer, int errors, 269 struct vscsibk_pend *pending_req) 270{ 271 struct scsiback_tpg *tpg = pending_req->v2p->tpg; 272 273 pr_err("xen-pvscsi[%s:%d] cmnd[0]=%02x -> st=%02x msg=%02x host=%02x drv=%02x\n", 274 tpg->tport->tport_name, pending_req->v2p->lun, 275 pending_req->cmnd[0], status_byte(errors), msg_byte(errors), 276 host_byte(errors), driver_byte(errors)); 277 278 if (CHECK_CONDITION & status_byte(errors)) 279 __scsi_print_sense("xen-pvscsi", sense_buffer, 280 SCSI_SENSE_BUFFERSIZE); 281} 282 283static void scsiback_fast_flush_area(struct vscsibk_pend *req) 284{ 285 struct gnttab_unmap_grant_ref unmap[VSCSI_GRANT_BATCH]; 286 struct page *pages[VSCSI_GRANT_BATCH]; 287 unsigned int i, invcount = 0; 288 grant_handle_t handle; 289 int err; 290 291 kfree(req->sgl); 292 req->sgl = NULL; 293 req->n_sg = 0; 294 295 if (!req->n_grants) 296 return; 297 298 for (i = 0; i < req->n_grants; i++) { 299 handle = req->grant_handles[i]; 300 if (handle == SCSIBACK_INVALID_HANDLE) 301 continue; 302 gnttab_set_unmap_op(&unmap[invcount], vaddr(req, i), 303 GNTMAP_host_map, handle); 304 req->grant_handles[i] = SCSIBACK_INVALID_HANDLE; 305 pages[invcount] = req->pages[i]; 306 put_page(pages[invcount]); 307 invcount++; 308 if (invcount < VSCSI_GRANT_BATCH) 309 continue; 310 err = gnttab_unmap_refs(unmap, NULL, pages, invcount); 311 BUG_ON(err); 312 invcount = 0; 313 } 314 315 if (invcount) { 316 err = gnttab_unmap_refs(unmap, NULL, pages, invcount); 317 BUG_ON(err); 318 } 319 320 put_free_pages(req->pages, req->n_grants); 321 req->n_grants = 0; 322} 323 324static void scsiback_free_translation_entry(struct kref *kref) 325{ 326 struct v2p_entry *entry = container_of(kref, struct v2p_entry, kref); 327 struct scsiback_tpg *tpg = entry->tpg; 328 329 mutex_lock(&tpg->tv_tpg_mutex); 330 tpg->tv_tpg_fe_count--; 331 mutex_unlock(&tpg->tv_tpg_mutex); 332 333 kfree(entry); 334} 335 336static void scsiback_do_resp_with_sense(char *sense_buffer, int32_t result, 337 uint32_t resid, struct vscsibk_pend *pending_req) 338{ 339 struct vscsiif_response *ring_res; 340 struct vscsibk_info *info = pending_req->info; 341 int notify; 342 struct scsi_sense_hdr sshdr; 343 unsigned long flags; 344 unsigned len; 345 346 spin_lock_irqsave(&info->ring_lock, flags); 347 348 ring_res = RING_GET_RESPONSE(&info->ring, info->ring.rsp_prod_pvt); 349 info->ring.rsp_prod_pvt++; 350 351 ring_res->rslt = result; 352 ring_res->rqid = pending_req->rqid; 353 354 if (sense_buffer != NULL && 355 scsi_normalize_sense(sense_buffer, VSCSIIF_SENSE_BUFFERSIZE, 356 &sshdr)) { 357 len = min_t(unsigned, 8 + sense_buffer[7], 358 VSCSIIF_SENSE_BUFFERSIZE); 359 memcpy(ring_res->sense_buffer, sense_buffer, len); 360 ring_res->sense_len = len; 361 } else { 362 ring_res->sense_len = 0; 363 } 364 365 ring_res->residual_len = resid; 366 367 RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(&info->ring, notify); 368 spin_unlock_irqrestore(&info->ring_lock, flags); 369 370 if (notify) 371 notify_remote_via_irq(info->irq); 372 373 if (pending_req->v2p) 374 kref_put(&pending_req->v2p->kref, 375 scsiback_free_translation_entry); 376} 377 378static void scsiback_cmd_done(struct vscsibk_pend *pending_req) 379{ 380 struct vscsibk_info *info = pending_req->info; 381 unsigned char *sense_buffer; 382 unsigned int resid; 383 int errors; 384 385 sense_buffer = pending_req->sense_buffer; 386 resid = pending_req->se_cmd.residual_count; 387 errors = pending_req->result; 388 389 if (errors && log_print_stat) 390 scsiback_print_status(sense_buffer, errors, pending_req); 391 392 scsiback_fast_flush_area(pending_req); 393 scsiback_do_resp_with_sense(sense_buffer, errors, resid, pending_req); 394 scsiback_put(info); 395} 396 397static void scsiback_cmd_exec(struct vscsibk_pend *pending_req) 398{ 399 struct se_cmd *se_cmd = &pending_req->se_cmd; 400 struct se_session *sess = pending_req->v2p->tpg->tpg_nexus->tvn_se_sess; 401 int rc; 402 403 memset(pending_req->sense_buffer, 0, VSCSIIF_SENSE_BUFFERSIZE); 404 405 memset(se_cmd, 0, sizeof(*se_cmd)); 406 407 scsiback_get(pending_req->info); 408 rc = target_submit_cmd_map_sgls(se_cmd, sess, pending_req->cmnd, 409 pending_req->sense_buffer, pending_req->v2p->lun, 410 pending_req->data_len, 0, 411 pending_req->sc_data_direction, 0, 412 pending_req->sgl, pending_req->n_sg, 413 NULL, 0, NULL, 0); 414 if (rc < 0) { 415 transport_send_check_condition_and_sense(se_cmd, 416 TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); 417 transport_generic_free_cmd(se_cmd, 0); 418 } 419} 420 421static int scsiback_gnttab_data_map_batch(struct gnttab_map_grant_ref *map, 422 struct page **pg, grant_handle_t *grant, int cnt) 423{ 424 int err, i; 425 426 if (!cnt) 427 return 0; 428 429 err = gnttab_map_refs(map, NULL, pg, cnt); 430 BUG_ON(err); 431 for (i = 0; i < cnt; i++) { 432 if (unlikely(map[i].status != GNTST_okay)) { 433 pr_err("xen-pvscsi: invalid buffer -- could not remap it\n"); 434 map[i].handle = SCSIBACK_INVALID_HANDLE; 435 err = -ENOMEM; 436 } else { 437 get_page(pg[i]); 438 } 439 grant[i] = map[i].handle; 440 } 441 return err; 442} 443 444static int scsiback_gnttab_data_map_list(struct vscsibk_pend *pending_req, 445 struct scsiif_request_segment *seg, struct page **pg, 446 grant_handle_t *grant, int cnt, u32 flags) 447{ 448 int mapcount = 0, i, err = 0; 449 struct gnttab_map_grant_ref map[VSCSI_GRANT_BATCH]; 450 struct vscsibk_info *info = pending_req->info; 451 452 for (i = 0; i < cnt; i++) { 453 if (get_free_page(pg + mapcount)) { 454 put_free_pages(pg, mapcount); 455 pr_err("xen-pvscsi: no grant page\n"); 456 return -ENOMEM; 457 } 458 gnttab_set_map_op(&map[mapcount], vaddr_page(pg[mapcount]), 459 flags, seg[i].gref, info->domid); 460 mapcount++; 461 if (mapcount < VSCSI_GRANT_BATCH) 462 continue; 463 err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); 464 pg += mapcount; 465 grant += mapcount; 466 pending_req->n_grants += mapcount; 467 if (err) 468 return err; 469 mapcount = 0; 470 } 471 err = scsiback_gnttab_data_map_batch(map, pg, grant, mapcount); 472 pending_req->n_grants += mapcount; 473 return err; 474} 475 476static int scsiback_gnttab_data_map(struct vscsiif_request *ring_req, 477 struct vscsibk_pend *pending_req) 478{ 479 u32 flags; 480 int i, err, n_segs, i_seg = 0; 481 struct page **pg; 482 struct scsiif_request_segment *seg; 483 unsigned long end_seg = 0; 484 unsigned int nr_segments = (unsigned int)ring_req->nr_segments; 485 unsigned int nr_sgl = 0; 486 struct scatterlist *sg; 487 grant_handle_t *grant; 488 489 pending_req->n_sg = 0; 490 pending_req->n_grants = 0; 491 pending_req->data_len = 0; 492 493 nr_segments &= ~VSCSIIF_SG_GRANT; 494 if (!nr_segments) 495 return 0; 496 497 if (nr_segments > VSCSIIF_SG_TABLESIZE) { 498 DPRINTK("xen-pvscsi: invalid parameter nr_seg = %d\n", 499 ring_req->nr_segments); 500 return -EINVAL; 501 } 502 503 if (ring_req->nr_segments & VSCSIIF_SG_GRANT) { 504 err = scsiback_gnttab_data_map_list(pending_req, ring_req->seg, 505 pending_req->pages, pending_req->grant_handles, 506 nr_segments, GNTMAP_host_map | GNTMAP_readonly); 507 if (err) 508 return err; 509 nr_sgl = nr_segments; 510 nr_segments = 0; 511 for (i = 0; i < nr_sgl; i++) { 512 n_segs = ring_req->seg[i].length / 513 sizeof(struct scsiif_request_segment); 514 if ((unsigned)ring_req->seg[i].offset + 515 (unsigned)ring_req->seg[i].length > PAGE_SIZE || 516 n_segs * sizeof(struct scsiif_request_segment) != 517 ring_req->seg[i].length) 518 return -EINVAL; 519 nr_segments += n_segs; 520 } 521 if (nr_segments > SG_ALL) { 522 DPRINTK("xen-pvscsi: invalid nr_seg = %d\n", 523 nr_segments); 524 return -EINVAL; 525 } 526 } 527 528 /* free of (sgl) in fast_flush_area()*/ 529 pending_req->sgl = kmalloc_array(nr_segments, 530 sizeof(struct scatterlist), GFP_KERNEL); 531 if (!pending_req->sgl) 532 return -ENOMEM; 533 534 sg_init_table(pending_req->sgl, nr_segments); 535 pending_req->n_sg = nr_segments; 536 537 flags = GNTMAP_host_map; 538 if (pending_req->sc_data_direction == DMA_TO_DEVICE) 539 flags |= GNTMAP_readonly; 540 541 pg = pending_req->pages + nr_sgl; 542 grant = pending_req->grant_handles + nr_sgl; 543 if (!nr_sgl) { 544 seg = ring_req->seg; 545 err = scsiback_gnttab_data_map_list(pending_req, seg, 546 pg, grant, nr_segments, flags); 547 if (err) 548 return err; 549 } else { 550 for (i = 0; i < nr_sgl; i++) { 551 seg = (struct scsiif_request_segment *)( 552 vaddr(pending_req, i) + ring_req->seg[i].offset); 553 n_segs = ring_req->seg[i].length / 554 sizeof(struct scsiif_request_segment); 555 err = scsiback_gnttab_data_map_list(pending_req, seg, 556 pg, grant, n_segs, flags); 557 if (err) 558 return err; 559 pg += n_segs; 560 grant += n_segs; 561 } 562 end_seg = vaddr(pending_req, 0) + ring_req->seg[0].offset; 563 seg = (struct scsiif_request_segment *)end_seg; 564 end_seg += ring_req->seg[0].length; 565 pg = pending_req->pages + nr_sgl; 566 } 567 568 for_each_sg(pending_req->sgl, sg, nr_segments, i) { 569 sg_set_page(sg, pg[i], seg->length, seg->offset); 570 pending_req->data_len += seg->length; 571 seg++; 572 if (nr_sgl && (unsigned long)seg >= end_seg) { 573 i_seg++; 574 end_seg = vaddr(pending_req, i_seg) + 575 ring_req->seg[i_seg].offset; 576 seg = (struct scsiif_request_segment *)end_seg; 577 end_seg += ring_req->seg[i_seg].length; 578 } 579 if (sg->offset >= PAGE_SIZE || 580 sg->length > PAGE_SIZE || 581 sg->offset + sg->length > PAGE_SIZE) 582 return -EINVAL; 583 } 584 585 return 0; 586} 587 588static void scsiback_disconnect(struct vscsibk_info *info) 589{ 590 wait_event(info->waiting_to_free, 591 atomic_read(&info->nr_unreplied_reqs) == 0); 592 593 unbind_from_irqhandler(info->irq, info); 594 info->irq = 0; 595 xenbus_unmap_ring_vfree(info->dev, info->ring.sring); 596} 597 598static void scsiback_device_action(struct vscsibk_pend *pending_req, 599 enum tcm_tmreq_table act, int tag) 600{ 601 int rc, err = FAILED; 602 struct scsiback_tpg *tpg = pending_req->v2p->tpg; 603 struct se_cmd *se_cmd = &pending_req->se_cmd; 604 struct scsiback_tmr *tmr; 605 606 tmr = kzalloc(sizeof(struct scsiback_tmr), GFP_KERNEL); 607 if (!tmr) 608 goto out; 609 610 init_waitqueue_head(&tmr->tmr_wait); 611 612 transport_init_se_cmd(se_cmd, tpg->se_tpg.se_tpg_tfo, 613 tpg->tpg_nexus->tvn_se_sess, 0, DMA_NONE, MSG_SIMPLE_TAG, 614 &pending_req->sense_buffer[0]); 615 616 rc = core_tmr_alloc_req(se_cmd, tmr, act, GFP_KERNEL); 617 if (rc < 0) 618 goto out; 619 620 se_cmd->se_tmr_req->ref_task_tag = tag; 621 622 if (transport_lookup_tmr_lun(se_cmd, pending_req->v2p->lun) < 0) 623 goto out; 624 625 transport_generic_handle_tmr(se_cmd); 626 wait_event(tmr->tmr_wait, atomic_read(&tmr->tmr_complete)); 627 628 err = (se_cmd->se_tmr_req->response == TMR_FUNCTION_COMPLETE) ? 629 SUCCESS : FAILED; 630 631out: 632 if (tmr) { 633 transport_generic_free_cmd(&pending_req->se_cmd, 1); 634 kfree(tmr); 635 } 636 637 scsiback_do_resp_with_sense(NULL, err, 0, pending_req); 638 639 kmem_cache_free(scsiback_cachep, pending_req); 640} 641 642/* 643 Perform virtual to physical translation 644*/ 645static struct v2p_entry *scsiback_do_translation(struct vscsibk_info *info, 646 struct ids_tuple *v) 647{ 648 struct v2p_entry *entry; 649 struct list_head *head = &(info->v2p_entry_lists); 650 unsigned long flags; 651 652 spin_lock_irqsave(&info->v2p_lock, flags); 653 list_for_each_entry(entry, head, l) { 654 if ((entry->v.chn == v->chn) && 655 (entry->v.tgt == v->tgt) && 656 (entry->v.lun == v->lun)) { 657 kref_get(&entry->kref); 658 goto out; 659 } 660 } 661 entry = NULL; 662 663out: 664 spin_unlock_irqrestore(&info->v2p_lock, flags); 665 return entry; 666} 667 668static int prepare_pending_reqs(struct vscsibk_info *info, 669 struct vscsiif_request *ring_req, 670 struct vscsibk_pend *pending_req) 671{ 672 struct v2p_entry *v2p; 673 struct ids_tuple vir; 674 675 pending_req->rqid = ring_req->rqid; 676 pending_req->info = info; 677 678 vir.chn = ring_req->channel; 679 vir.tgt = ring_req->id; 680 vir.lun = ring_req->lun; 681 682 v2p = scsiback_do_translation(info, &vir); 683 if (!v2p) { 684 pending_req->v2p = NULL; 685 DPRINTK("xen-pvscsi: doesn't exist.\n"); 686 return -ENODEV; 687 } 688 pending_req->v2p = v2p; 689 690 /* request range check from frontend */ 691 pending_req->sc_data_direction = ring_req->sc_data_direction; 692 if ((pending_req->sc_data_direction != DMA_BIDIRECTIONAL) && 693 (pending_req->sc_data_direction != DMA_TO_DEVICE) && 694 (pending_req->sc_data_direction != DMA_FROM_DEVICE) && 695 (pending_req->sc_data_direction != DMA_NONE)) { 696 DPRINTK("xen-pvscsi: invalid parameter data_dir = %d\n", 697 pending_req->sc_data_direction); 698 return -EINVAL; 699 } 700 701 pending_req->cmd_len = ring_req->cmd_len; 702 if (pending_req->cmd_len > VSCSIIF_MAX_COMMAND_SIZE) { 703 DPRINTK("xen-pvscsi: invalid parameter cmd_len = %d\n", 704 pending_req->cmd_len); 705 return -EINVAL; 706 } 707 memcpy(pending_req->cmnd, ring_req->cmnd, pending_req->cmd_len); 708 709 return 0; 710} 711 712static int scsiback_do_cmd_fn(struct vscsibk_info *info) 713{ 714 struct vscsiif_back_ring *ring = &info->ring; 715 struct vscsiif_request *ring_req; 716 struct vscsibk_pend *pending_req; 717 RING_IDX rc, rp; 718 int err, more_to_do; 719 uint32_t result; 720 uint8_t act; 721 722 rc = ring->req_cons; 723 rp = ring->sring->req_prod; 724 rmb(); /* guest system is accessing ring, too */ 725 726 if (RING_REQUEST_PROD_OVERFLOW(ring, rp)) { 727 rc = ring->rsp_prod_pvt; 728 pr_warn("xen-pvscsi: Dom%d provided bogus ring requests (%#x - %#x = %u). Halting ring processing\n", 729 info->domid, rp, rc, rp - rc); 730 info->ring_error = 1; 731 return 0; 732 } 733 734 while ((rc != rp)) { 735 if (RING_REQUEST_CONS_OVERFLOW(ring, rc)) 736 break; 737 pending_req = kmem_cache_alloc(scsiback_cachep, GFP_KERNEL); 738 if (!pending_req) 739 return 1; 740 741 ring_req = RING_GET_REQUEST(ring, rc); 742 ring->req_cons = ++rc; 743 744 act = ring_req->act; 745 err = prepare_pending_reqs(info, ring_req, pending_req); 746 if (err) { 747 switch (err) { 748 case -ENODEV: 749 result = DID_NO_CONNECT; 750 break; 751 default: 752 result = DRIVER_ERROR; 753 break; 754 } 755 scsiback_do_resp_with_sense(NULL, result << 24, 0, 756 pending_req); 757 kmem_cache_free(scsiback_cachep, pending_req); 758 return 1; 759 } 760 761 switch (act) { 762 case VSCSIIF_ACT_SCSI_CDB: 763 if (scsiback_gnttab_data_map(ring_req, pending_req)) { 764 scsiback_fast_flush_area(pending_req); 765 scsiback_do_resp_with_sense(NULL, 766 DRIVER_ERROR << 24, 0, pending_req); 767 kmem_cache_free(scsiback_cachep, pending_req); 768 } else { 769 scsiback_cmd_exec(pending_req); 770 } 771 break; 772 case VSCSIIF_ACT_SCSI_ABORT: 773 scsiback_device_action(pending_req, TMR_ABORT_TASK, 774 ring_req->ref_rqid); 775 break; 776 case VSCSIIF_ACT_SCSI_RESET: 777 scsiback_device_action(pending_req, TMR_LUN_RESET, 0); 778 break; 779 default: 780 pr_err_ratelimited("xen-pvscsi: invalid request\n"); 781 scsiback_do_resp_with_sense(NULL, DRIVER_ERROR << 24, 782 0, pending_req); 783 kmem_cache_free(scsiback_cachep, pending_req); 784 break; 785 } 786 787 /* Yield point for this unbounded loop. */ 788 cond_resched(); 789 } 790 791 RING_FINAL_CHECK_FOR_REQUESTS(&info->ring, more_to_do); 792 return more_to_do; 793} 794 795static irqreturn_t scsiback_irq_fn(int irq, void *dev_id) 796{ 797 struct vscsibk_info *info = dev_id; 798 799 if (info->ring_error) 800 return IRQ_HANDLED; 801 802 while (scsiback_do_cmd_fn(info)) 803 cond_resched(); 804 805 return IRQ_HANDLED; 806} 807 808static int scsiback_init_sring(struct vscsibk_info *info, grant_ref_t ring_ref, 809 evtchn_port_t evtchn) 810{ 811 void *area; 812 struct vscsiif_sring *sring; 813 int err; 814 815 if (info->irq) 816 return -1; 817 818 err = xenbus_map_ring_valloc(info->dev, ring_ref, &area); 819 if (err) 820 return err; 821 822 sring = (struct vscsiif_sring *)area; 823 BACK_RING_INIT(&info->ring, sring, PAGE_SIZE); 824 825 err = bind_interdomain_evtchn_to_irq(info->domid, evtchn); 826 if (err < 0) 827 goto unmap_page; 828 829 info->irq = err; 830 831 err = request_threaded_irq(info->irq, NULL, scsiback_irq_fn, 832 IRQF_ONESHOT, "vscsiif-backend", info); 833 if (err) 834 goto free_irq; 835 836 return 0; 837 838free_irq: 839 unbind_from_irqhandler(info->irq, info); 840 info->irq = 0; 841unmap_page: 842 xenbus_unmap_ring_vfree(info->dev, area); 843 844 return err; 845} 846 847static int scsiback_map(struct vscsibk_info *info) 848{ 849 struct xenbus_device *dev = info->dev; 850 unsigned int ring_ref, evtchn; 851 int err; 852 853 err = xenbus_gather(XBT_NIL, dev->otherend, 854 "ring-ref", "%u", &ring_ref, 855 "event-channel", "%u", &evtchn, NULL); 856 if (err) { 857 xenbus_dev_fatal(dev, err, "reading %s ring", dev->otherend); 858 return err; 859 } 860 861 return scsiback_init_sring(info, ring_ref, evtchn); 862} 863 864/* 865 Add a new translation entry 866*/ 867static int scsiback_add_translation_entry(struct vscsibk_info *info, 868 char *phy, struct ids_tuple *v) 869{ 870 int err = 0; 871 struct v2p_entry *entry; 872 struct v2p_entry *new; 873 struct list_head *head = &(info->v2p_entry_lists); 874 unsigned long flags; 875 char *lunp; 876 unsigned int lun; 877 struct scsiback_tpg *tpg_entry, *tpg = NULL; 878 char *error = "doesn't exist"; 879 880 lunp = strrchr(phy, ':'); 881 if (!lunp) { 882 pr_err("xen-pvscsi: illegal format of physical device %s\n", 883 phy); 884 return -EINVAL; 885 } 886 *lunp = 0; 887 lunp++; 888 if (kstrtouint(lunp, 10, &lun) || lun >= TRANSPORT_MAX_LUNS_PER_TPG) { 889 pr_err("xen-pvscsi: lun number not valid: %s\n", lunp); 890 return -EINVAL; 891 } 892 893 mutex_lock(&scsiback_mutex); 894 list_for_each_entry(tpg_entry, &scsiback_list, tv_tpg_list) { 895 if (!strcmp(phy, tpg_entry->tport->tport_name) || 896 !strcmp(phy, tpg_entry->param_alias)) { 897 spin_lock(&tpg_entry->se_tpg.tpg_lun_lock); 898 if (tpg_entry->se_tpg.tpg_lun_list[lun]->lun_status == 899 TRANSPORT_LUN_STATUS_ACTIVE) { 900 if (!tpg_entry->tpg_nexus) 901 error = "nexus undefined"; 902 else 903 tpg = tpg_entry; 904 } 905 spin_unlock(&tpg_entry->se_tpg.tpg_lun_lock); 906 break; 907 } 908 } 909 if (tpg) { 910 mutex_lock(&tpg->tv_tpg_mutex); 911 tpg->tv_tpg_fe_count++; 912 mutex_unlock(&tpg->tv_tpg_mutex); 913 } 914 mutex_unlock(&scsiback_mutex); 915 916 if (!tpg) { 917 pr_err("xen-pvscsi: %s:%d %s\n", phy, lun, error); 918 return -ENODEV; 919 } 920 921 new = kmalloc(sizeof(struct v2p_entry), GFP_KERNEL); 922 if (new == NULL) { 923 err = -ENOMEM; 924 goto out_free; 925 } 926 927 spin_lock_irqsave(&info->v2p_lock, flags); 928 929 /* Check double assignment to identical virtual ID */ 930 list_for_each_entry(entry, head, l) { 931 if ((entry->v.chn == v->chn) && 932 (entry->v.tgt == v->tgt) && 933 (entry->v.lun == v->lun)) { 934 pr_warn("xen-pvscsi: Virtual ID is already used. Assignment was not performed.\n"); 935 err = -EEXIST; 936 goto out; 937 } 938 939 } 940 941 /* Create a new translation entry and add to the list */ 942 kref_init(&new->kref); 943 new->v = *v; 944 new->tpg = tpg; 945 new->lun = lun; 946 list_add_tail(&new->l, head); 947 948out: 949 spin_unlock_irqrestore(&info->v2p_lock, flags); 950 951out_free: 952 mutex_lock(&tpg->tv_tpg_mutex); 953 tpg->tv_tpg_fe_count--; 954 mutex_unlock(&tpg->tv_tpg_mutex); 955 956 if (err) 957 kfree(new); 958 959 return err; 960} 961 962static void __scsiback_del_translation_entry(struct v2p_entry *entry) 963{ 964 list_del(&entry->l); 965 kref_put(&entry->kref, scsiback_free_translation_entry); 966} 967 968/* 969 Delete the translation entry specfied 970*/ 971static int scsiback_del_translation_entry(struct vscsibk_info *info, 972 struct ids_tuple *v) 973{ 974 struct v2p_entry *entry; 975 struct list_head *head = &(info->v2p_entry_lists); 976 unsigned long flags; 977 978 spin_lock_irqsave(&info->v2p_lock, flags); 979 /* Find out the translation entry specified */ 980 list_for_each_entry(entry, head, l) { 981 if ((entry->v.chn == v->chn) && 982 (entry->v.tgt == v->tgt) && 983 (entry->v.lun == v->lun)) { 984 goto found; 985 } 986 } 987 988 spin_unlock_irqrestore(&info->v2p_lock, flags); 989 return 1; 990 991found: 992 /* Delete the translation entry specfied */ 993 __scsiback_del_translation_entry(entry); 994 995 spin_unlock_irqrestore(&info->v2p_lock, flags); 996 return 0; 997} 998 999static void scsiback_do_add_lun(struct vscsibk_info *info, const char *state, 1000 char *phy, struct ids_tuple *vir) 1001{ 1002 if (!scsiback_add_translation_entry(info, phy, vir)) { 1003 if (xenbus_printf(XBT_NIL, info->dev->nodename, state, 1004 "%d", XenbusStateInitialised)) { 1005 pr_err("xen-pvscsi: xenbus_printf error %s\n", state); 1006 scsiback_del_translation_entry(info, vir); 1007 } 1008 } else { 1009 xenbus_printf(XBT_NIL, info->dev->nodename, state, 1010 "%d", XenbusStateClosed); 1011 } 1012} 1013 1014static void scsiback_do_del_lun(struct vscsibk_info *info, const char *state, 1015 struct ids_tuple *vir) 1016{ 1017 if (!scsiback_del_translation_entry(info, vir)) { 1018 if (xenbus_printf(XBT_NIL, info->dev->nodename, state, 1019 "%d", XenbusStateClosed)) 1020 pr_err("xen-pvscsi: xenbus_printf error %s\n", state); 1021 } 1022} 1023 1024#define VSCSIBACK_OP_ADD_OR_DEL_LUN 1 1025#define VSCSIBACK_OP_UPDATEDEV_STATE 2 1026 1027static void scsiback_do_1lun_hotplug(struct vscsibk_info *info, int op, 1028 char *ent) 1029{ 1030 int err; 1031 struct ids_tuple vir; 1032 char *val; 1033 int device_state; 1034 char phy[VSCSI_NAMELEN]; 1035 char str[64]; 1036 char state[64]; 1037 struct xenbus_device *dev = info->dev; 1038 1039 /* read status */ 1040 snprintf(state, sizeof(state), "vscsi-devs/%s/state", ent); 1041 err = xenbus_scanf(XBT_NIL, dev->nodename, state, "%u", &device_state); 1042 if (XENBUS_EXIST_ERR(err)) 1043 return; 1044 1045 /* physical SCSI device */ 1046 snprintf(str, sizeof(str), "vscsi-devs/%s/p-dev", ent); 1047 val = xenbus_read(XBT_NIL, dev->nodename, str, NULL); 1048 if (IS_ERR(val)) { 1049 xenbus_printf(XBT_NIL, dev->nodename, state, 1050 "%d", XenbusStateClosed); 1051 return; 1052 } 1053 strlcpy(phy, val, VSCSI_NAMELEN); 1054 kfree(val); 1055 1056 /* virtual SCSI device */ 1057 snprintf(str, sizeof(str), "vscsi-devs/%s/v-dev", ent); 1058 err = xenbus_scanf(XBT_NIL, dev->nodename, str, "%u:%u:%u:%u", 1059 &vir.hst, &vir.chn, &vir.tgt, &vir.lun); 1060 if (XENBUS_EXIST_ERR(err)) { 1061 xenbus_printf(XBT_NIL, dev->nodename, state, 1062 "%d", XenbusStateClosed); 1063 return; 1064 } 1065 1066 switch (op) { 1067 case VSCSIBACK_OP_ADD_OR_DEL_LUN: 1068 if (device_state == XenbusStateInitialising) 1069 scsiback_do_add_lun(info, state, phy, &vir); 1070 if (device_state == XenbusStateClosing) 1071 scsiback_do_del_lun(info, state, &vir); 1072 break; 1073 1074 case VSCSIBACK_OP_UPDATEDEV_STATE: 1075 if (device_state == XenbusStateInitialised) { 1076 /* modify vscsi-devs/dev-x/state */ 1077 if (xenbus_printf(XBT_NIL, dev->nodename, state, 1078 "%d", XenbusStateConnected)) { 1079 pr_err("xen-pvscsi: xenbus_printf error %s\n", 1080 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 DPRINTK("%p %d\n", 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("xen-pvscsi: %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("xen-pvscsi: 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("xen-pvscsi: 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 1479 * pointer. 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 /* 1668 * Now register the TCM pvscsi virtual I_T Nexus as active with the 1669 * call to __transport_register_session() 1670 */ 1671 __transport_register_session(se_tpg, tv_nexus->tvn_se_sess->se_node_acl, 1672 tv_nexus->tvn_se_sess, tv_nexus); 1673 tpg->tpg_nexus = tv_nexus; 1674 1675 mutex_unlock(&tpg->tv_tpg_mutex); 1676 return 0; 1677 1678out: 1679 transport_free_session(se_sess); 1680 kfree(tv_nexus); 1681 return -ENOMEM; 1682} 1683 1684static int scsiback_drop_nexus(struct scsiback_tpg *tpg) 1685{ 1686 struct se_session *se_sess; 1687 struct scsiback_nexus *tv_nexus; 1688 1689 mutex_lock(&tpg->tv_tpg_mutex); 1690 tv_nexus = tpg->tpg_nexus; 1691 if (!tv_nexus) { 1692 mutex_unlock(&tpg->tv_tpg_mutex); 1693 return -ENODEV; 1694 } 1695 1696 se_sess = tv_nexus->tvn_se_sess; 1697 if (!se_sess) { 1698 mutex_unlock(&tpg->tv_tpg_mutex); 1699 return -ENODEV; 1700 } 1701 1702 if (tpg->tv_tpg_port_count != 0) { 1703 mutex_unlock(&tpg->tv_tpg_mutex); 1704 pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG port count: %d\n", 1705 tpg->tv_tpg_port_count); 1706 return -EBUSY; 1707 } 1708 1709 if (tpg->tv_tpg_fe_count != 0) { 1710 mutex_unlock(&tpg->tv_tpg_mutex); 1711 pr_err("Unable to remove xen-pvscsi I_T Nexus with active TPG frontend count: %d\n", 1712 tpg->tv_tpg_fe_count); 1713 return -EBUSY; 1714 } 1715 1716 pr_debug("xen-pvscsi: Removing I_T Nexus to emulated %s Initiator Port: %s\n", 1717 scsiback_dump_proto_id(tpg->tport), 1718 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1719 1720 /* 1721 * Release the SCSI I_T Nexus to the emulated xen-pvscsi Target Port 1722 */ 1723 transport_deregister_session(tv_nexus->tvn_se_sess); 1724 tpg->tpg_nexus = NULL; 1725 mutex_unlock(&tpg->tv_tpg_mutex); 1726 1727 kfree(tv_nexus); 1728 return 0; 1729} 1730 1731static ssize_t scsiback_tpg_show_nexus(struct se_portal_group *se_tpg, 1732 char *page) 1733{ 1734 struct scsiback_tpg *tpg = container_of(se_tpg, 1735 struct scsiback_tpg, se_tpg); 1736 struct scsiback_nexus *tv_nexus; 1737 ssize_t ret; 1738 1739 mutex_lock(&tpg->tv_tpg_mutex); 1740 tv_nexus = tpg->tpg_nexus; 1741 if (!tv_nexus) { 1742 mutex_unlock(&tpg->tv_tpg_mutex); 1743 return -ENODEV; 1744 } 1745 ret = snprintf(page, PAGE_SIZE, "%s\n", 1746 tv_nexus->tvn_se_sess->se_node_acl->initiatorname); 1747 mutex_unlock(&tpg->tv_tpg_mutex); 1748 1749 return ret; 1750} 1751 1752static ssize_t scsiback_tpg_store_nexus(struct se_portal_group *se_tpg, 1753 const char *page, 1754 size_t count) 1755{ 1756 struct scsiback_tpg *tpg = container_of(se_tpg, 1757 struct scsiback_tpg, se_tpg); 1758 struct scsiback_tport *tport_wwn = tpg->tport; 1759 unsigned char i_port[VSCSI_NAMELEN], *ptr, *port_ptr; 1760 int ret; 1761 /* 1762 * Shutdown the active I_T nexus if 'NULL' is passed.. 1763 */ 1764 if (!strncmp(page, "NULL", 4)) { 1765 ret = scsiback_drop_nexus(tpg); 1766 return (!ret) ? count : ret; 1767 } 1768 /* 1769 * Otherwise make sure the passed virtual Initiator port WWN matches 1770 * the fabric protocol_id set in scsiback_make_tport(), and call 1771 * scsiback_make_nexus(). 1772 */ 1773 if (strlen(page) >= VSCSI_NAMELEN) { 1774 pr_err("Emulated NAA Sas Address: %s, exceeds max: %d\n", 1775 page, VSCSI_NAMELEN); 1776 return -EINVAL; 1777 } 1778 snprintf(&i_port[0], VSCSI_NAMELEN, "%s", page); 1779 1780 ptr = strstr(i_port, "naa."); 1781 if (ptr) { 1782 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_SAS) { 1783 pr_err("Passed SAS Initiator Port %s does not match target port protoid: %s\n", 1784 i_port, scsiback_dump_proto_id(tport_wwn)); 1785 return -EINVAL; 1786 } 1787 port_ptr = &i_port[0]; 1788 goto check_newline; 1789 } 1790 ptr = strstr(i_port, "fc."); 1791 if (ptr) { 1792 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_FCP) { 1793 pr_err("Passed FCP Initiator Port %s does not match target port protoid: %s\n", 1794 i_port, scsiback_dump_proto_id(tport_wwn)); 1795 return -EINVAL; 1796 } 1797 port_ptr = &i_port[3]; /* Skip over "fc." */ 1798 goto check_newline; 1799 } 1800 ptr = strstr(i_port, "iqn."); 1801 if (ptr) { 1802 if (tport_wwn->tport_proto_id != SCSI_PROTOCOL_ISCSI) { 1803 pr_err("Passed iSCSI Initiator Port %s does not match target port protoid: %s\n", 1804 i_port, scsiback_dump_proto_id(tport_wwn)); 1805 return -EINVAL; 1806 } 1807 port_ptr = &i_port[0]; 1808 goto check_newline; 1809 } 1810 pr_err("Unable to locate prefix for emulated Initiator Port: %s\n", 1811 i_port); 1812 return -EINVAL; 1813 /* 1814 * Clear any trailing newline for the NAA WWN 1815 */ 1816check_newline: 1817 if (i_port[strlen(i_port) - 1] == '\n') 1818 i_port[strlen(i_port) - 1] = '\0'; 1819 1820 ret = scsiback_make_nexus(tpg, port_ptr); 1821 if (ret < 0) 1822 return ret; 1823 1824 return count; 1825} 1826 1827TF_TPG_BASE_ATTR(scsiback, nexus, S_IRUGO | S_IWUSR); 1828 1829static struct configfs_attribute *scsiback_tpg_attrs[] = { 1830 &scsiback_tpg_nexus.attr, 1831 NULL, 1832}; 1833 1834static ssize_t 1835scsiback_wwn_show_attr_version(struct target_fabric_configfs *tf, 1836 char *page) 1837{ 1838 return sprintf(page, "xen-pvscsi fabric module %s on %s/%s on " 1839 UTS_RELEASE"\n", 1840 VSCSI_VERSION, utsname()->sysname, utsname()->machine); 1841} 1842 1843TF_WWN_ATTR_RO(scsiback, version); 1844 1845static struct configfs_attribute *scsiback_wwn_attrs[] = { 1846 &scsiback_wwn_version.attr, 1847 NULL, 1848}; 1849 1850static char *scsiback_get_fabric_name(void) 1851{ 1852 return "xen-pvscsi"; 1853} 1854 1855static int scsiback_port_link(struct se_portal_group *se_tpg, 1856 struct se_lun *lun) 1857{ 1858 struct scsiback_tpg *tpg = container_of(se_tpg, 1859 struct scsiback_tpg, se_tpg); 1860 1861 mutex_lock(&tpg->tv_tpg_mutex); 1862 tpg->tv_tpg_port_count++; 1863 mutex_unlock(&tpg->tv_tpg_mutex); 1864 1865 return 0; 1866} 1867 1868static void scsiback_port_unlink(struct se_portal_group *se_tpg, 1869 struct se_lun *lun) 1870{ 1871 struct scsiback_tpg *tpg = container_of(se_tpg, 1872 struct scsiback_tpg, se_tpg); 1873 1874 mutex_lock(&tpg->tv_tpg_mutex); 1875 tpg->tv_tpg_port_count--; 1876 mutex_unlock(&tpg->tv_tpg_mutex); 1877} 1878 1879static struct se_portal_group * 1880scsiback_make_tpg(struct se_wwn *wwn, 1881 struct config_group *group, 1882 const char *name) 1883{ 1884 struct scsiback_tport *tport = container_of(wwn, 1885 struct scsiback_tport, tport_wwn); 1886 1887 struct scsiback_tpg *tpg; 1888 u16 tpgt; 1889 int ret; 1890 1891 if (strstr(name, "tpgt_") != name) 1892 return ERR_PTR(-EINVAL); 1893 ret = kstrtou16(name + 5, 10, &tpgt); 1894 if (ret) 1895 return ERR_PTR(ret); 1896 1897 tpg = kzalloc(sizeof(struct scsiback_tpg), GFP_KERNEL); 1898 if (!tpg) 1899 return ERR_PTR(-ENOMEM); 1900 1901 mutex_init(&tpg->tv_tpg_mutex); 1902 INIT_LIST_HEAD(&tpg->tv_tpg_list); 1903 INIT_LIST_HEAD(&tpg->info_list); 1904 tpg->tport = tport; 1905 tpg->tport_tpgt = tpgt; 1906 1907 ret = core_tpg_register(&scsiback_fabric_configfs->tf_ops, wwn, 1908 &tpg->se_tpg, tpg, TRANSPORT_TPG_TYPE_NORMAL); 1909 if (ret < 0) { 1910 kfree(tpg); 1911 return NULL; 1912 } 1913 mutex_lock(&scsiback_mutex); 1914 list_add_tail(&tpg->tv_tpg_list, &scsiback_list); 1915 mutex_unlock(&scsiback_mutex); 1916 1917 return &tpg->se_tpg; 1918} 1919 1920static void scsiback_drop_tpg(struct se_portal_group *se_tpg) 1921{ 1922 struct scsiback_tpg *tpg = container_of(se_tpg, 1923 struct scsiback_tpg, se_tpg); 1924 1925 mutex_lock(&scsiback_mutex); 1926 list_del(&tpg->tv_tpg_list); 1927 mutex_unlock(&scsiback_mutex); 1928 /* 1929 * Release the virtual I_T Nexus for this xen-pvscsi TPG 1930 */ 1931 scsiback_drop_nexus(tpg); 1932 /* 1933 * Deregister the se_tpg from TCM.. 1934 */ 1935 core_tpg_deregister(se_tpg); 1936 kfree(tpg); 1937} 1938 1939static int scsiback_check_true(struct se_portal_group *se_tpg) 1940{ 1941 return 1; 1942} 1943 1944static int scsiback_check_false(struct se_portal_group *se_tpg) 1945{ 1946 return 0; 1947} 1948 1949static struct target_core_fabric_ops scsiback_ops = { 1950 .get_fabric_name = scsiback_get_fabric_name, 1951 .get_fabric_proto_ident = scsiback_get_fabric_proto_ident, 1952 .tpg_get_wwn = scsiback_get_fabric_wwn, 1953 .tpg_get_tag = scsiback_get_tag, 1954 .tpg_get_default_depth = scsiback_get_default_depth, 1955 .tpg_get_pr_transport_id = scsiback_get_pr_transport_id, 1956 .tpg_get_pr_transport_id_len = scsiback_get_pr_transport_id_len, 1957 .tpg_parse_pr_out_transport_id = scsiback_parse_pr_out_transport_id, 1958 .tpg_check_demo_mode = scsiback_check_true, 1959 .tpg_check_demo_mode_cache = scsiback_check_true, 1960 .tpg_check_demo_mode_write_protect = scsiback_check_false, 1961 .tpg_check_prod_mode_write_protect = scsiback_check_false, 1962 .tpg_alloc_fabric_acl = scsiback_alloc_fabric_acl, 1963 .tpg_release_fabric_acl = scsiback_release_fabric_acl, 1964 .tpg_get_inst_index = scsiback_tpg_get_inst_index, 1965 .check_stop_free = scsiback_check_stop_free, 1966 .release_cmd = scsiback_release_cmd, 1967 .put_session = NULL, 1968 .shutdown_session = scsiback_shutdown_session, 1969 .close_session = scsiback_close_session, 1970 .sess_get_index = scsiback_sess_get_index, 1971 .sess_get_initiator_sid = NULL, 1972 .write_pending = scsiback_write_pending, 1973 .write_pending_status = scsiback_write_pending_status, 1974 .set_default_node_attributes = scsiback_set_default_node_attrs, 1975 .get_task_tag = scsiback_get_task_tag, 1976 .get_cmd_state = scsiback_get_cmd_state, 1977 .queue_data_in = scsiback_queue_data_in, 1978 .queue_status = scsiback_queue_status, 1979 .queue_tm_rsp = scsiback_queue_tm_rsp, 1980 .aborted_task = scsiback_aborted_task, 1981 /* 1982 * Setup callers for generic logic in target_core_fabric_configfs.c 1983 */ 1984 .fabric_make_wwn = scsiback_make_tport, 1985 .fabric_drop_wwn = scsiback_drop_tport, 1986 .fabric_make_tpg = scsiback_make_tpg, 1987 .fabric_drop_tpg = scsiback_drop_tpg, 1988 .fabric_post_link = scsiback_port_link, 1989 .fabric_pre_unlink = scsiback_port_unlink, 1990 .fabric_make_np = NULL, 1991 .fabric_drop_np = NULL, 1992#if 0 1993 .fabric_make_nodeacl = scsiback_make_nodeacl, 1994 .fabric_drop_nodeacl = scsiback_drop_nodeacl, 1995#endif 1996}; 1997 1998static int scsiback_register_configfs(void) 1999{ 2000 struct target_fabric_configfs *fabric; 2001 int ret; 2002 2003 pr_debug("xen-pvscsi: fabric module %s on %s/%s on "UTS_RELEASE"\n", 2004 VSCSI_VERSION, utsname()->sysname, utsname()->machine); 2005 /* 2006 * Register the top level struct config_item_type with TCM core 2007 */ 2008 fabric = target_fabric_configfs_init(THIS_MODULE, "xen-pvscsi"); 2009 if (IS_ERR(fabric)) 2010 return PTR_ERR(fabric); 2011 2012 /* 2013 * Setup fabric->tf_ops from our local scsiback_ops 2014 */ 2015 fabric->tf_ops = scsiback_ops; 2016 /* 2017 * Setup default attribute lists for various fabric->tf_cit_tmpl 2018 */ 2019 fabric->tf_cit_tmpl.tfc_wwn_cit.ct_attrs = scsiback_wwn_attrs; 2020 fabric->tf_cit_tmpl.tfc_tpg_base_cit.ct_attrs = scsiback_tpg_attrs; 2021 fabric->tf_cit_tmpl.tfc_tpg_attrib_cit.ct_attrs = NULL; 2022 fabric->tf_cit_tmpl.tfc_tpg_param_cit.ct_attrs = scsiback_param_attrs; 2023 fabric->tf_cit_tmpl.tfc_tpg_np_base_cit.ct_attrs = NULL; 2024 fabric->tf_cit_tmpl.tfc_tpg_nacl_base_cit.ct_attrs = NULL; 2025 fabric->tf_cit_tmpl.tfc_tpg_nacl_attrib_cit.ct_attrs = NULL; 2026 fabric->tf_cit_tmpl.tfc_tpg_nacl_auth_cit.ct_attrs = NULL; 2027 fabric->tf_cit_tmpl.tfc_tpg_nacl_param_cit.ct_attrs = NULL; 2028 /* 2029 * Register the fabric for use within TCM 2030 */ 2031 ret = target_fabric_configfs_register(fabric); 2032 if (ret < 0) { 2033 target_fabric_configfs_free(fabric); 2034 return ret; 2035 } 2036 /* 2037 * Setup our local pointer to *fabric 2038 */ 2039 scsiback_fabric_configfs = fabric; 2040 pr_debug("xen-pvscsi: Set fabric -> scsiback_fabric_configfs\n"); 2041 return 0; 2042}; 2043 2044static void scsiback_deregister_configfs(void) 2045{ 2046 if (!scsiback_fabric_configfs) 2047 return; 2048 2049 target_fabric_configfs_deregister(scsiback_fabric_configfs); 2050 scsiback_fabric_configfs = NULL; 2051 pr_debug("xen-pvscsi: Cleared scsiback_fabric_configfs\n"); 2052}; 2053 2054static const struct xenbus_device_id scsiback_ids[] = { 2055 { "vscsi" }, 2056 { "" } 2057}; 2058 2059static struct xenbus_driver scsiback_driver = { 2060 .ids = scsiback_ids, 2061 .probe = scsiback_probe, 2062 .remove = scsiback_remove, 2063 .otherend_changed = scsiback_frontend_changed 2064}; 2065 2066static void scsiback_init_pend(void *p) 2067{ 2068 struct vscsibk_pend *pend = p; 2069 int i; 2070 2071 memset(pend, 0, sizeof(*pend)); 2072 for (i = 0; i < VSCSI_MAX_GRANTS; i++) 2073 pend->grant_handles[i] = SCSIBACK_INVALID_HANDLE; 2074} 2075 2076static int __init scsiback_init(void) 2077{ 2078 int ret; 2079 2080 if (!xen_domain()) 2081 return -ENODEV; 2082 2083 scsiback_cachep = kmem_cache_create("vscsiif_cache", 2084 sizeof(struct vscsibk_pend), 0, 0, scsiback_init_pend); 2085 if (!scsiback_cachep) 2086 return -ENOMEM; 2087 2088 ret = xenbus_register_backend(&scsiback_driver); 2089 if (ret) 2090 goto out_cache_destroy; 2091 2092 ret = scsiback_register_configfs(); 2093 if (ret) 2094 goto out_unregister_xenbus; 2095 2096 return 0; 2097 2098out_unregister_xenbus: 2099 xenbus_unregister_driver(&scsiback_driver); 2100out_cache_destroy: 2101 kmem_cache_destroy(scsiback_cachep); 2102 pr_err("xen-pvscsi: %s: error %d\n", __func__, ret); 2103 return ret; 2104} 2105 2106static void __exit scsiback_exit(void) 2107{ 2108 struct page *page; 2109 2110 while (free_pages_num) { 2111 if (get_free_page(&page)) 2112 BUG(); 2113 free_xenballooned_pages(1, &page); 2114 } 2115 scsiback_deregister_configfs(); 2116 xenbus_unregister_driver(&scsiback_driver); 2117 kmem_cache_destroy(scsiback_cachep); 2118} 2119 2120module_init(scsiback_init); 2121module_exit(scsiback_exit); 2122 2123MODULE_DESCRIPTION("Xen SCSI backend driver"); 2124MODULE_LICENSE("Dual BSD/GPL"); 2125MODULE_ALIAS("xen-backend:vscsi"); 2126MODULE_AUTHOR("Juergen Gross <jgross@suse.com>"); 2127