1 /******************************************************************************* 2 * Filename: target_core_rd.c 3 * 4 * This file contains the Storage Engine <-> Ramdisk transport 5 * specific functions. 6 * 7 * (c) Copyright 2003-2013 Datera, Inc. 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 24 * 25 ******************************************************************************/ 26 27 #include <linux/string.h> 28 #include <linux/parser.h> 29 #include <linux/timer.h> 30 #include <linux/slab.h> 31 #include <linux/spinlock.h> 32 #include <scsi/scsi_proto.h> 33 34 #include <target/target_core_base.h> 35 #include <target/target_core_backend.h> 36 37 #include "target_core_rd.h" 38 39 static inline struct rd_dev *RD_DEV(struct se_device *dev) 40 { 41 return container_of(dev, struct rd_dev, dev); 42 } 43 44 static int rd_attach_hba(struct se_hba *hba, u32 host_id) 45 { 46 struct rd_host *rd_host; 47 48 rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); 49 if (!rd_host) { 50 pr_err("Unable to allocate memory for struct rd_host\n"); 51 return -ENOMEM; 52 } 53 54 rd_host->rd_host_id = host_id; 55 56 hba->hba_ptr = rd_host; 57 58 pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" 59 " Generic Target Core Stack %s\n", hba->hba_id, 60 RD_HBA_VERSION, TARGET_CORE_VERSION); 61 62 return 0; 63 } 64 65 static void rd_detach_hba(struct se_hba *hba) 66 { 67 struct rd_host *rd_host = hba->hba_ptr; 68 69 pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" 70 " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); 71 72 kfree(rd_host); 73 hba->hba_ptr = NULL; 74 } 75 76 static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, 77 u32 sg_table_count) 78 { 79 struct page *pg; 80 struct scatterlist *sg; 81 u32 i, j, page_count = 0, sg_per_table; 82 83 for (i = 0; i < sg_table_count; i++) { 84 sg = sg_table[i].sg_table; 85 sg_per_table = sg_table[i].rd_sg_count; 86 87 for (j = 0; j < sg_per_table; j++) { 88 pg = sg_page(&sg[j]); 89 if (pg) { 90 __free_page(pg); 91 page_count++; 92 } 93 } 94 kfree(sg); 95 } 96 97 kfree(sg_table); 98 return page_count; 99 } 100 101 static void rd_release_device_space(struct rd_dev *rd_dev) 102 { 103 u32 page_count; 104 105 if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) 106 return; 107 108 page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array, 109 rd_dev->sg_table_count); 110 111 pr_debug("CORE_RD[%u] - Released device space for Ramdisk" 112 " Device ID: %u, pages %u in %u tables total bytes %lu\n", 113 rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, 114 rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); 115 116 rd_dev->sg_table_array = NULL; 117 rd_dev->sg_table_count = 0; 118 } 119 120 121 /* rd_build_device_space(): 122 * 123 * 124 */ 125 static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, 126 u32 total_sg_needed, unsigned char init_payload) 127 { 128 u32 i = 0, j, page_offset = 0, sg_per_table; 129 u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / 130 sizeof(struct scatterlist)); 131 struct page *pg; 132 struct scatterlist *sg; 133 unsigned char *p; 134 135 while (total_sg_needed) { 136 unsigned int chain_entry = 0; 137 138 sg_per_table = (total_sg_needed > max_sg_per_table) ? 139 max_sg_per_table : total_sg_needed; 140 141 #ifdef CONFIG_ARCH_HAS_SG_CHAIN 142 143 /* 144 * Reserve extra element for chain entry 145 */ 146 if (sg_per_table < total_sg_needed) 147 chain_entry = 1; 148 149 #endif /* CONFIG_ARCH_HAS_SG_CHAIN */ 150 151 sg = kcalloc(sg_per_table + chain_entry, sizeof(*sg), 152 GFP_KERNEL); 153 if (!sg) { 154 pr_err("Unable to allocate scatterlist array" 155 " for struct rd_dev\n"); 156 return -ENOMEM; 157 } 158 159 sg_init_table(sg, sg_per_table + chain_entry); 160 161 #ifdef CONFIG_ARCH_HAS_SG_CHAIN 162 163 if (i > 0) { 164 sg_chain(sg_table[i - 1].sg_table, 165 max_sg_per_table + 1, sg); 166 } 167 168 #endif /* CONFIG_ARCH_HAS_SG_CHAIN */ 169 170 sg_table[i].sg_table = sg; 171 sg_table[i].rd_sg_count = sg_per_table; 172 sg_table[i].page_start_offset = page_offset; 173 sg_table[i++].page_end_offset = (page_offset + sg_per_table) 174 - 1; 175 176 for (j = 0; j < sg_per_table; j++) { 177 pg = alloc_pages(GFP_KERNEL, 0); 178 if (!pg) { 179 pr_err("Unable to allocate scatterlist" 180 " pages for struct rd_dev_sg_table\n"); 181 return -ENOMEM; 182 } 183 sg_assign_page(&sg[j], pg); 184 sg[j].length = PAGE_SIZE; 185 186 p = kmap(pg); 187 memset(p, init_payload, PAGE_SIZE); 188 kunmap(pg); 189 } 190 191 page_offset += sg_per_table; 192 total_sg_needed -= sg_per_table; 193 } 194 195 return 0; 196 } 197 198 static int rd_build_device_space(struct rd_dev *rd_dev) 199 { 200 struct rd_dev_sg_table *sg_table; 201 u32 sg_tables, total_sg_needed; 202 u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / 203 sizeof(struct scatterlist)); 204 int rc; 205 206 if (rd_dev->rd_page_count <= 0) { 207 pr_err("Illegal page count: %u for Ramdisk device\n", 208 rd_dev->rd_page_count); 209 return -EINVAL; 210 } 211 212 /* Don't need backing pages for NULLIO */ 213 if (rd_dev->rd_flags & RDF_NULLIO) 214 return 0; 215 216 total_sg_needed = rd_dev->rd_page_count; 217 218 sg_tables = (total_sg_needed / max_sg_per_table) + 1; 219 220 sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); 221 if (!sg_table) { 222 pr_err("Unable to allocate memory for Ramdisk" 223 " scatterlist tables\n"); 224 return -ENOMEM; 225 } 226 227 rd_dev->sg_table_array = sg_table; 228 rd_dev->sg_table_count = sg_tables; 229 230 rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00); 231 if (rc) 232 return rc; 233 234 pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" 235 " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, 236 rd_dev->rd_dev_id, rd_dev->rd_page_count, 237 rd_dev->sg_table_count); 238 239 return 0; 240 } 241 242 static void rd_release_prot_space(struct rd_dev *rd_dev) 243 { 244 u32 page_count; 245 246 if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count) 247 return; 248 249 page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array, 250 rd_dev->sg_prot_count); 251 252 pr_debug("CORE_RD[%u] - Released protection space for Ramdisk" 253 " Device ID: %u, pages %u in %u tables total bytes %lu\n", 254 rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, 255 rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); 256 257 rd_dev->sg_prot_array = NULL; 258 rd_dev->sg_prot_count = 0; 259 } 260 261 static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size) 262 { 263 struct rd_dev_sg_table *sg_table; 264 u32 total_sg_needed, sg_tables; 265 u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / 266 sizeof(struct scatterlist)); 267 int rc; 268 269 if (rd_dev->rd_flags & RDF_NULLIO) 270 return 0; 271 /* 272 * prot_length=8byte dif data 273 * tot sg needed = rd_page_count * (PGSZ/block_size) * 274 * (prot_length/block_size) + pad 275 * PGSZ canceled each other. 276 */ 277 total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1; 278 279 sg_tables = (total_sg_needed / max_sg_per_table) + 1; 280 281 sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); 282 if (!sg_table) { 283 pr_err("Unable to allocate memory for Ramdisk protection" 284 " scatterlist tables\n"); 285 return -ENOMEM; 286 } 287 288 rd_dev->sg_prot_array = sg_table; 289 rd_dev->sg_prot_count = sg_tables; 290 291 rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff); 292 if (rc) 293 return rc; 294 295 pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of" 296 " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, 297 rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count); 298 299 return 0; 300 } 301 302 static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name) 303 { 304 struct rd_dev *rd_dev; 305 struct rd_host *rd_host = hba->hba_ptr; 306 307 rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); 308 if (!rd_dev) { 309 pr_err("Unable to allocate memory for struct rd_dev\n"); 310 return NULL; 311 } 312 313 rd_dev->rd_host = rd_host; 314 315 return &rd_dev->dev; 316 } 317 318 static int rd_configure_device(struct se_device *dev) 319 { 320 struct rd_dev *rd_dev = RD_DEV(dev); 321 struct rd_host *rd_host = dev->se_hba->hba_ptr; 322 int ret; 323 324 if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { 325 pr_debug("Missing rd_pages= parameter\n"); 326 return -EINVAL; 327 } 328 329 ret = rd_build_device_space(rd_dev); 330 if (ret < 0) 331 goto fail; 332 333 dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; 334 dev->dev_attrib.hw_max_sectors = UINT_MAX; 335 dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; 336 337 rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; 338 339 pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of" 340 " %u pages in %u tables, %lu total bytes\n", 341 rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count, 342 rd_dev->sg_table_count, 343 (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); 344 345 return 0; 346 347 fail: 348 rd_release_device_space(rd_dev); 349 return ret; 350 } 351 352 static void rd_dev_call_rcu(struct rcu_head *p) 353 { 354 struct se_device *dev = container_of(p, struct se_device, rcu_head); 355 struct rd_dev *rd_dev = RD_DEV(dev); 356 357 kfree(rd_dev); 358 } 359 360 static void rd_free_device(struct se_device *dev) 361 { 362 struct rd_dev *rd_dev = RD_DEV(dev); 363 364 rd_release_device_space(rd_dev); 365 call_rcu(&dev->rcu_head, rd_dev_call_rcu); 366 } 367 368 static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) 369 { 370 struct rd_dev_sg_table *sg_table; 371 u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / 372 sizeof(struct scatterlist)); 373 374 i = page / sg_per_table; 375 if (i < rd_dev->sg_table_count) { 376 sg_table = &rd_dev->sg_table_array[i]; 377 if ((sg_table->page_start_offset <= page) && 378 (sg_table->page_end_offset >= page)) 379 return sg_table; 380 } 381 382 pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", 383 page); 384 385 return NULL; 386 } 387 388 static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page) 389 { 390 struct rd_dev_sg_table *sg_table; 391 u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / 392 sizeof(struct scatterlist)); 393 394 i = page / sg_per_table; 395 if (i < rd_dev->sg_prot_count) { 396 sg_table = &rd_dev->sg_prot_array[i]; 397 if ((sg_table->page_start_offset <= page) && 398 (sg_table->page_end_offset >= page)) 399 return sg_table; 400 } 401 402 pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n", 403 page); 404 405 return NULL; 406 } 407 408 static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read) 409 { 410 struct se_device *se_dev = cmd->se_dev; 411 struct rd_dev *dev = RD_DEV(se_dev); 412 struct rd_dev_sg_table *prot_table; 413 bool need_to_release = false; 414 struct scatterlist *prot_sg; 415 u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size; 416 u32 prot_offset, prot_page; 417 u32 prot_npages __maybe_unused; 418 u64 tmp; 419 sense_reason_t rc = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 420 421 tmp = cmd->t_task_lba * se_dev->prot_length; 422 prot_offset = do_div(tmp, PAGE_SIZE); 423 prot_page = tmp; 424 425 prot_table = rd_get_prot_table(dev, prot_page); 426 if (!prot_table) 427 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 428 429 prot_sg = &prot_table->sg_table[prot_page - 430 prot_table->page_start_offset]; 431 432 #ifndef CONFIG_ARCH_HAS_SG_CHAIN 433 434 prot_npages = DIV_ROUND_UP(prot_offset + sectors * se_dev->prot_length, 435 PAGE_SIZE); 436 437 /* 438 * Allocate temporaly contiguous scatterlist entries if prot pages 439 * straddles multiple scatterlist tables. 440 */ 441 if (prot_table->page_end_offset < prot_page + prot_npages - 1) { 442 int i; 443 444 prot_sg = kcalloc(prot_npages, sizeof(*prot_sg), GFP_KERNEL); 445 if (!prot_sg) 446 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 447 448 need_to_release = true; 449 sg_init_table(prot_sg, prot_npages); 450 451 for (i = 0; i < prot_npages; i++) { 452 if (prot_page + i > prot_table->page_end_offset) { 453 prot_table = rd_get_prot_table(dev, 454 prot_page + i); 455 if (!prot_table) { 456 kfree(prot_sg); 457 return rc; 458 } 459 sg_unmark_end(&prot_sg[i - 1]); 460 } 461 prot_sg[i] = prot_table->sg_table[prot_page + i - 462 prot_table->page_start_offset]; 463 } 464 } 465 466 #endif /* !CONFIG_ARCH_HAS_SG_CHAIN */ 467 468 if (is_read) 469 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, 470 prot_sg, prot_offset); 471 else 472 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, 473 cmd->t_prot_sg, 0); 474 475 if (!rc) 476 sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset); 477 478 if (need_to_release) 479 kfree(prot_sg); 480 481 return rc; 482 } 483 484 static sense_reason_t 485 rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 486 enum dma_data_direction data_direction) 487 { 488 struct se_device *se_dev = cmd->se_dev; 489 struct rd_dev *dev = RD_DEV(se_dev); 490 struct rd_dev_sg_table *table; 491 struct scatterlist *rd_sg; 492 struct sg_mapping_iter m; 493 u32 rd_offset; 494 u32 rd_size; 495 u32 rd_page; 496 u32 src_len; 497 u64 tmp; 498 sense_reason_t rc; 499 500 if (dev->rd_flags & RDF_NULLIO) { 501 target_complete_cmd(cmd, SAM_STAT_GOOD); 502 return 0; 503 } 504 505 tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; 506 rd_offset = do_div(tmp, PAGE_SIZE); 507 rd_page = tmp; 508 rd_size = cmd->data_length; 509 510 table = rd_get_sg_table(dev, rd_page); 511 if (!table) 512 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 513 514 rd_sg = &table->sg_table[rd_page - table->page_start_offset]; 515 516 pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", 517 dev->rd_dev_id, 518 data_direction == DMA_FROM_DEVICE ? "Read" : "Write", 519 cmd->t_task_lba, rd_size, rd_page, rd_offset); 520 521 if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && 522 data_direction == DMA_TO_DEVICE) { 523 rc = rd_do_prot_rw(cmd, false); 524 if (rc) 525 return rc; 526 } 527 528 src_len = PAGE_SIZE - rd_offset; 529 sg_miter_start(&m, sgl, sgl_nents, 530 data_direction == DMA_FROM_DEVICE ? 531 SG_MITER_TO_SG : SG_MITER_FROM_SG); 532 while (rd_size) { 533 u32 len; 534 void *rd_addr; 535 536 sg_miter_next(&m); 537 if (!(u32)m.length) { 538 pr_debug("RD[%u]: invalid sgl %p len %zu\n", 539 dev->rd_dev_id, m.addr, m.length); 540 sg_miter_stop(&m); 541 return TCM_INCORRECT_AMOUNT_OF_DATA; 542 } 543 len = min((u32)m.length, src_len); 544 if (len > rd_size) { 545 pr_debug("RD[%u]: size underrun page %d offset %d " 546 "size %d\n", dev->rd_dev_id, 547 rd_page, rd_offset, rd_size); 548 len = rd_size; 549 } 550 m.consumed = len; 551 552 rd_addr = sg_virt(rd_sg) + rd_offset; 553 554 if (data_direction == DMA_FROM_DEVICE) 555 memcpy(m.addr, rd_addr, len); 556 else 557 memcpy(rd_addr, m.addr, len); 558 559 rd_size -= len; 560 if (!rd_size) 561 continue; 562 563 src_len -= len; 564 if (src_len) { 565 rd_offset += len; 566 continue; 567 } 568 569 /* rd page completed, next one please */ 570 rd_page++; 571 rd_offset = 0; 572 src_len = PAGE_SIZE; 573 if (rd_page <= table->page_end_offset) { 574 rd_sg++; 575 continue; 576 } 577 578 table = rd_get_sg_table(dev, rd_page); 579 if (!table) { 580 sg_miter_stop(&m); 581 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 582 } 583 584 /* since we increment, the first sg entry is correct */ 585 rd_sg = table->sg_table; 586 } 587 sg_miter_stop(&m); 588 589 if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && 590 data_direction == DMA_FROM_DEVICE) { 591 rc = rd_do_prot_rw(cmd, true); 592 if (rc) 593 return rc; 594 } 595 596 target_complete_cmd(cmd, SAM_STAT_GOOD); 597 return 0; 598 } 599 600 enum { 601 Opt_rd_pages, Opt_rd_nullio, Opt_err 602 }; 603 604 static match_table_t tokens = { 605 {Opt_rd_pages, "rd_pages=%d"}, 606 {Opt_rd_nullio, "rd_nullio=%d"}, 607 {Opt_err, NULL} 608 }; 609 610 static ssize_t rd_set_configfs_dev_params(struct se_device *dev, 611 const char *page, ssize_t count) 612 { 613 struct rd_dev *rd_dev = RD_DEV(dev); 614 char *orig, *ptr, *opts; 615 substring_t args[MAX_OPT_ARGS]; 616 int ret = 0, arg, token; 617 618 opts = kstrdup(page, GFP_KERNEL); 619 if (!opts) 620 return -ENOMEM; 621 622 orig = opts; 623 624 while ((ptr = strsep(&opts, ",\n")) != NULL) { 625 if (!*ptr) 626 continue; 627 628 token = match_token(ptr, tokens, args); 629 switch (token) { 630 case Opt_rd_pages: 631 match_int(args, &arg); 632 rd_dev->rd_page_count = arg; 633 pr_debug("RAMDISK: Referencing Page" 634 " Count: %u\n", rd_dev->rd_page_count); 635 rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; 636 break; 637 case Opt_rd_nullio: 638 match_int(args, &arg); 639 if (arg != 1) 640 break; 641 642 pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); 643 rd_dev->rd_flags |= RDF_NULLIO; 644 break; 645 default: 646 break; 647 } 648 } 649 650 kfree(orig); 651 return (!ret) ? count : ret; 652 } 653 654 static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) 655 { 656 struct rd_dev *rd_dev = RD_DEV(dev); 657 658 ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", 659 rd_dev->rd_dev_id); 660 bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" 661 " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, 662 PAGE_SIZE, rd_dev->sg_table_count, 663 !!(rd_dev->rd_flags & RDF_NULLIO)); 664 return bl; 665 } 666 667 static sector_t rd_get_blocks(struct se_device *dev) 668 { 669 struct rd_dev *rd_dev = RD_DEV(dev); 670 671 unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / 672 dev->dev_attrib.block_size) - 1; 673 674 return blocks_long; 675 } 676 677 static int rd_init_prot(struct se_device *dev) 678 { 679 struct rd_dev *rd_dev = RD_DEV(dev); 680 681 if (!dev->dev_attrib.pi_prot_type) 682 return 0; 683 684 return rd_build_prot_space(rd_dev, dev->prot_length, 685 dev->dev_attrib.block_size); 686 } 687 688 static void rd_free_prot(struct se_device *dev) 689 { 690 struct rd_dev *rd_dev = RD_DEV(dev); 691 692 rd_release_prot_space(rd_dev); 693 } 694 695 static struct sbc_ops rd_sbc_ops = { 696 .execute_rw = rd_execute_rw, 697 }; 698 699 static sense_reason_t 700 rd_parse_cdb(struct se_cmd *cmd) 701 { 702 return sbc_parse_cdb(cmd, &rd_sbc_ops); 703 } 704 705 static const struct target_backend_ops rd_mcp_ops = { 706 .name = "rd_mcp", 707 .inquiry_prod = "RAMDISK-MCP", 708 .inquiry_rev = RD_MCP_VERSION, 709 .attach_hba = rd_attach_hba, 710 .detach_hba = rd_detach_hba, 711 .alloc_device = rd_alloc_device, 712 .configure_device = rd_configure_device, 713 .free_device = rd_free_device, 714 .parse_cdb = rd_parse_cdb, 715 .set_configfs_dev_params = rd_set_configfs_dev_params, 716 .show_configfs_dev_params = rd_show_configfs_dev_params, 717 .get_device_type = sbc_get_device_type, 718 .get_blocks = rd_get_blocks, 719 .init_prot = rd_init_prot, 720 .free_prot = rd_free_prot, 721 .tb_dev_attrib_attrs = sbc_attrib_attrs, 722 }; 723 724 int __init rd_module_init(void) 725 { 726 return transport_backend_register(&rd_mcp_ops); 727 } 728 729 void rd_module_exit(void) 730 { 731 target_backend_unregister(&rd_mcp_ops); 732 } 733