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.h> 33 #include <scsi/scsi_host.h> 34 35 #include <target/target_core_base.h> 36 #include <target/target_core_backend.h> 37 38 #include "target_core_rd.h" 39 40 static inline struct rd_dev *RD_DEV(struct se_device *dev) 41 { 42 return container_of(dev, struct rd_dev, dev); 43 } 44 45 static int rd_attach_hba(struct se_hba *hba, u32 host_id) 46 { 47 struct rd_host *rd_host; 48 49 rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); 50 if (!rd_host) { 51 pr_err("Unable to allocate memory for struct rd_host\n"); 52 return -ENOMEM; 53 } 54 55 rd_host->rd_host_id = host_id; 56 57 hba->hba_ptr = rd_host; 58 59 pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" 60 " Generic Target Core Stack %s\n", hba->hba_id, 61 RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); 62 63 return 0; 64 } 65 66 static void rd_detach_hba(struct se_hba *hba) 67 { 68 struct rd_host *rd_host = hba->hba_ptr; 69 70 pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" 71 " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); 72 73 kfree(rd_host); 74 hba->hba_ptr = NULL; 75 } 76 77 static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, 78 u32 sg_table_count) 79 { 80 struct page *pg; 81 struct scatterlist *sg; 82 u32 i, j, page_count = 0, sg_per_table; 83 84 for (i = 0; i < sg_table_count; i++) { 85 sg = sg_table[i].sg_table; 86 sg_per_table = sg_table[i].rd_sg_count; 87 88 for (j = 0; j < sg_per_table; j++) { 89 pg = sg_page(&sg[j]); 90 if (pg) { 91 __free_page(pg); 92 page_count++; 93 } 94 } 95 kfree(sg); 96 } 97 98 kfree(sg_table); 99 return page_count; 100 } 101 102 static void rd_release_device_space(struct rd_dev *rd_dev) 103 { 104 u32 page_count; 105 106 if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) 107 return; 108 109 page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array, 110 rd_dev->sg_table_count); 111 112 pr_debug("CORE_RD[%u] - Released device space for Ramdisk" 113 " Device ID: %u, pages %u in %u tables total bytes %lu\n", 114 rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, 115 rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); 116 117 rd_dev->sg_table_array = NULL; 118 rd_dev->sg_table_count = 0; 119 } 120 121 122 /* rd_build_device_space(): 123 * 124 * 125 */ 126 static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, 127 u32 total_sg_needed, unsigned char init_payload) 128 { 129 u32 i = 0, j, page_offset = 0, sg_per_table; 130 u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / 131 sizeof(struct scatterlist)); 132 struct page *pg; 133 struct scatterlist *sg; 134 unsigned char *p; 135 136 while (total_sg_needed) { 137 unsigned int chain_entry = 0; 138 139 sg_per_table = (total_sg_needed > max_sg_per_table) ? 140 max_sg_per_table : total_sg_needed; 141 142 #ifdef CONFIG_ARCH_HAS_SG_CHAIN 143 144 /* 145 * Reserve extra element for chain entry 146 */ 147 if (sg_per_table < total_sg_needed) 148 chain_entry = 1; 149 150 #endif /* CONFIG_ARCH_HAS_SG_CHAIN */ 151 152 sg = kcalloc(sg_per_table + chain_entry, sizeof(*sg), 153 GFP_KERNEL); 154 if (!sg) { 155 pr_err("Unable to allocate scatterlist array" 156 " for struct rd_dev\n"); 157 return -ENOMEM; 158 } 159 160 sg_init_table(sg, sg_per_table + chain_entry); 161 162 #ifdef CONFIG_ARCH_HAS_SG_CHAIN 163 164 if (i > 0) { 165 sg_chain(sg_table[i - 1].sg_table, 166 max_sg_per_table + 1, sg); 167 } 168 169 #endif /* CONFIG_ARCH_HAS_SG_CHAIN */ 170 171 sg_table[i].sg_table = sg; 172 sg_table[i].rd_sg_count = sg_per_table; 173 sg_table[i].page_start_offset = page_offset; 174 sg_table[i++].page_end_offset = (page_offset + sg_per_table) 175 - 1; 176 177 for (j = 0; j < sg_per_table; j++) { 178 pg = alloc_pages(GFP_KERNEL, 0); 179 if (!pg) { 180 pr_err("Unable to allocate scatterlist" 181 " pages for struct rd_dev_sg_table\n"); 182 return -ENOMEM; 183 } 184 sg_assign_page(&sg[j], pg); 185 sg[j].length = PAGE_SIZE; 186 187 p = kmap(pg); 188 memset(p, init_payload, PAGE_SIZE); 189 kunmap(pg); 190 } 191 192 page_offset += sg_per_table; 193 total_sg_needed -= sg_per_table; 194 } 195 196 return 0; 197 } 198 199 static int rd_build_device_space(struct rd_dev *rd_dev) 200 { 201 struct rd_dev_sg_table *sg_table; 202 u32 sg_tables, total_sg_needed; 203 u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / 204 sizeof(struct scatterlist)); 205 int rc; 206 207 if (rd_dev->rd_page_count <= 0) { 208 pr_err("Illegal page count: %u for Ramdisk device\n", 209 rd_dev->rd_page_count); 210 return -EINVAL; 211 } 212 213 /* Don't need backing pages for NULLIO */ 214 if (rd_dev->rd_flags & RDF_NULLIO) 215 return 0; 216 217 total_sg_needed = rd_dev->rd_page_count; 218 219 sg_tables = (total_sg_needed / max_sg_per_table) + 1; 220 221 sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); 222 if (!sg_table) { 223 pr_err("Unable to allocate memory for Ramdisk" 224 " scatterlist tables\n"); 225 return -ENOMEM; 226 } 227 228 rd_dev->sg_table_array = sg_table; 229 rd_dev->sg_table_count = sg_tables; 230 231 rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00); 232 if (rc) 233 return rc; 234 235 pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" 236 " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, 237 rd_dev->rd_dev_id, rd_dev->rd_page_count, 238 rd_dev->sg_table_count); 239 240 return 0; 241 } 242 243 static void rd_release_prot_space(struct rd_dev *rd_dev) 244 { 245 u32 page_count; 246 247 if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count) 248 return; 249 250 page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array, 251 rd_dev->sg_prot_count); 252 253 pr_debug("CORE_RD[%u] - Released protection space for Ramdisk" 254 " Device ID: %u, pages %u in %u tables total bytes %lu\n", 255 rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, 256 rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); 257 258 rd_dev->sg_prot_array = NULL; 259 rd_dev->sg_prot_count = 0; 260 } 261 262 static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size) 263 { 264 struct rd_dev_sg_table *sg_table; 265 u32 total_sg_needed, sg_tables; 266 u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / 267 sizeof(struct scatterlist)); 268 int rc; 269 270 if (rd_dev->rd_flags & RDF_NULLIO) 271 return 0; 272 /* 273 * prot_length=8byte dif data 274 * tot sg needed = rd_page_count * (PGSZ/block_size) * 275 * (prot_length/block_size) + pad 276 * PGSZ canceled each other. 277 */ 278 total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1; 279 280 sg_tables = (total_sg_needed / max_sg_per_table) + 1; 281 282 sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); 283 if (!sg_table) { 284 pr_err("Unable to allocate memory for Ramdisk protection" 285 " scatterlist tables\n"); 286 return -ENOMEM; 287 } 288 289 rd_dev->sg_prot_array = sg_table; 290 rd_dev->sg_prot_count = sg_tables; 291 292 rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff); 293 if (rc) 294 return rc; 295 296 pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of" 297 " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, 298 rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count); 299 300 return 0; 301 } 302 303 static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name) 304 { 305 struct rd_dev *rd_dev; 306 struct rd_host *rd_host = hba->hba_ptr; 307 308 rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); 309 if (!rd_dev) { 310 pr_err("Unable to allocate memory for struct rd_dev\n"); 311 return NULL; 312 } 313 314 rd_dev->rd_host = rd_host; 315 316 return &rd_dev->dev; 317 } 318 319 static int rd_configure_device(struct se_device *dev) 320 { 321 struct rd_dev *rd_dev = RD_DEV(dev); 322 struct rd_host *rd_host = dev->se_hba->hba_ptr; 323 int ret; 324 325 if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { 326 pr_debug("Missing rd_pages= parameter\n"); 327 return -EINVAL; 328 } 329 330 ret = rd_build_device_space(rd_dev); 331 if (ret < 0) 332 goto fail; 333 334 dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; 335 dev->dev_attrib.hw_max_sectors = UINT_MAX; 336 dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; 337 338 rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; 339 340 pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of" 341 " %u pages in %u tables, %lu total bytes\n", 342 rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count, 343 rd_dev->sg_table_count, 344 (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); 345 346 return 0; 347 348 fail: 349 rd_release_device_space(rd_dev); 350 return ret; 351 } 352 353 static void rd_dev_call_rcu(struct rcu_head *p) 354 { 355 struct se_device *dev = container_of(p, struct se_device, rcu_head); 356 struct rd_dev *rd_dev = RD_DEV(dev); 357 358 kfree(rd_dev); 359 } 360 361 static void rd_free_device(struct se_device *dev) 362 { 363 struct rd_dev *rd_dev = RD_DEV(dev); 364 365 rd_release_device_space(rd_dev); 366 call_rcu(&dev->rcu_head, rd_dev_call_rcu); 367 } 368 369 static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) 370 { 371 struct rd_dev_sg_table *sg_table; 372 u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / 373 sizeof(struct scatterlist)); 374 375 i = page / sg_per_table; 376 if (i < rd_dev->sg_table_count) { 377 sg_table = &rd_dev->sg_table_array[i]; 378 if ((sg_table->page_start_offset <= page) && 379 (sg_table->page_end_offset >= page)) 380 return sg_table; 381 } 382 383 pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", 384 page); 385 386 return NULL; 387 } 388 389 static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page) 390 { 391 struct rd_dev_sg_table *sg_table; 392 u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / 393 sizeof(struct scatterlist)); 394 395 i = page / sg_per_table; 396 if (i < rd_dev->sg_prot_count) { 397 sg_table = &rd_dev->sg_prot_array[i]; 398 if ((sg_table->page_start_offset <= page) && 399 (sg_table->page_end_offset >= page)) 400 return sg_table; 401 } 402 403 pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n", 404 page); 405 406 return NULL; 407 } 408 409 static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read) 410 { 411 struct se_device *se_dev = cmd->se_dev; 412 struct rd_dev *dev = RD_DEV(se_dev); 413 struct rd_dev_sg_table *prot_table; 414 bool need_to_release = false; 415 struct scatterlist *prot_sg; 416 u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size; 417 u32 prot_offset, prot_page; 418 u32 prot_npages __maybe_unused; 419 u64 tmp; 420 sense_reason_t rc = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 421 422 tmp = cmd->t_task_lba * se_dev->prot_length; 423 prot_offset = do_div(tmp, PAGE_SIZE); 424 prot_page = tmp; 425 426 prot_table = rd_get_prot_table(dev, prot_page); 427 if (!prot_table) 428 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 429 430 prot_sg = &prot_table->sg_table[prot_page - 431 prot_table->page_start_offset]; 432 433 #ifndef CONFIG_ARCH_HAS_SG_CHAIN 434 435 prot_npages = DIV_ROUND_UP(prot_offset + sectors * se_dev->prot_length, 436 PAGE_SIZE); 437 438 /* 439 * Allocate temporaly contiguous scatterlist entries if prot pages 440 * straddles multiple scatterlist tables. 441 */ 442 if (prot_table->page_end_offset < prot_page + prot_npages - 1) { 443 int i; 444 445 prot_sg = kcalloc(prot_npages, sizeof(*prot_sg), GFP_KERNEL); 446 if (!prot_sg) 447 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 448 449 need_to_release = true; 450 sg_init_table(prot_sg, prot_npages); 451 452 for (i = 0; i < prot_npages; i++) { 453 if (prot_page + i > prot_table->page_end_offset) { 454 prot_table = rd_get_prot_table(dev, 455 prot_page + i); 456 if (!prot_table) { 457 kfree(prot_sg); 458 return rc; 459 } 460 sg_unmark_end(&prot_sg[i - 1]); 461 } 462 prot_sg[i] = prot_table->sg_table[prot_page + i - 463 prot_table->page_start_offset]; 464 } 465 } 466 467 #endif /* !CONFIG_ARCH_HAS_SG_CHAIN */ 468 469 if (is_read) 470 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, 471 prot_sg, prot_offset); 472 else 473 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, 474 cmd->t_prot_sg, 0); 475 476 if (!rc) 477 sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset); 478 479 if (need_to_release) 480 kfree(prot_sg); 481 482 return rc; 483 } 484 485 static sense_reason_t 486 rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 487 enum dma_data_direction data_direction) 488 { 489 struct se_device *se_dev = cmd->se_dev; 490 struct rd_dev *dev = RD_DEV(se_dev); 491 struct rd_dev_sg_table *table; 492 struct scatterlist *rd_sg; 493 struct sg_mapping_iter m; 494 u32 rd_offset; 495 u32 rd_size; 496 u32 rd_page; 497 u32 src_len; 498 u64 tmp; 499 sense_reason_t rc; 500 501 if (dev->rd_flags & RDF_NULLIO) { 502 target_complete_cmd(cmd, SAM_STAT_GOOD); 503 return 0; 504 } 505 506 tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; 507 rd_offset = do_div(tmp, PAGE_SIZE); 508 rd_page = tmp; 509 rd_size = cmd->data_length; 510 511 table = rd_get_sg_table(dev, rd_page); 512 if (!table) 513 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 514 515 rd_sg = &table->sg_table[rd_page - table->page_start_offset]; 516 517 pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", 518 dev->rd_dev_id, 519 data_direction == DMA_FROM_DEVICE ? "Read" : "Write", 520 cmd->t_task_lba, rd_size, rd_page, rd_offset); 521 522 if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && 523 data_direction == DMA_TO_DEVICE) { 524 rc = rd_do_prot_rw(cmd, false); 525 if (rc) 526 return rc; 527 } 528 529 src_len = PAGE_SIZE - rd_offset; 530 sg_miter_start(&m, sgl, sgl_nents, 531 data_direction == DMA_FROM_DEVICE ? 532 SG_MITER_TO_SG : SG_MITER_FROM_SG); 533 while (rd_size) { 534 u32 len; 535 void *rd_addr; 536 537 sg_miter_next(&m); 538 if (!(u32)m.length) { 539 pr_debug("RD[%u]: invalid sgl %p len %zu\n", 540 dev->rd_dev_id, m.addr, m.length); 541 sg_miter_stop(&m); 542 return TCM_INCORRECT_AMOUNT_OF_DATA; 543 } 544 len = min((u32)m.length, src_len); 545 if (len > rd_size) { 546 pr_debug("RD[%u]: size underrun page %d offset %d " 547 "size %d\n", dev->rd_dev_id, 548 rd_page, rd_offset, rd_size); 549 len = rd_size; 550 } 551 m.consumed = len; 552 553 rd_addr = sg_virt(rd_sg) + rd_offset; 554 555 if (data_direction == DMA_FROM_DEVICE) 556 memcpy(m.addr, rd_addr, len); 557 else 558 memcpy(rd_addr, m.addr, len); 559 560 rd_size -= len; 561 if (!rd_size) 562 continue; 563 564 src_len -= len; 565 if (src_len) { 566 rd_offset += len; 567 continue; 568 } 569 570 /* rd page completed, next one please */ 571 rd_page++; 572 rd_offset = 0; 573 src_len = PAGE_SIZE; 574 if (rd_page <= table->page_end_offset) { 575 rd_sg++; 576 continue; 577 } 578 579 table = rd_get_sg_table(dev, rd_page); 580 if (!table) { 581 sg_miter_stop(&m); 582 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 583 } 584 585 /* since we increment, the first sg entry is correct */ 586 rd_sg = table->sg_table; 587 } 588 sg_miter_stop(&m); 589 590 if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && 591 data_direction == DMA_FROM_DEVICE) { 592 rc = rd_do_prot_rw(cmd, true); 593 if (rc) 594 return rc; 595 } 596 597 target_complete_cmd(cmd, SAM_STAT_GOOD); 598 return 0; 599 } 600 601 enum { 602 Opt_rd_pages, Opt_rd_nullio, Opt_err 603 }; 604 605 static match_table_t tokens = { 606 {Opt_rd_pages, "rd_pages=%d"}, 607 {Opt_rd_nullio, "rd_nullio=%d"}, 608 {Opt_err, NULL} 609 }; 610 611 static ssize_t rd_set_configfs_dev_params(struct se_device *dev, 612 const char *page, ssize_t count) 613 { 614 struct rd_dev *rd_dev = RD_DEV(dev); 615 char *orig, *ptr, *opts; 616 substring_t args[MAX_OPT_ARGS]; 617 int ret = 0, arg, token; 618 619 opts = kstrdup(page, GFP_KERNEL); 620 if (!opts) 621 return -ENOMEM; 622 623 orig = opts; 624 625 while ((ptr = strsep(&opts, ",\n")) != NULL) { 626 if (!*ptr) 627 continue; 628 629 token = match_token(ptr, tokens, args); 630 switch (token) { 631 case Opt_rd_pages: 632 match_int(args, &arg); 633 rd_dev->rd_page_count = arg; 634 pr_debug("RAMDISK: Referencing Page" 635 " Count: %u\n", rd_dev->rd_page_count); 636 rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; 637 break; 638 case Opt_rd_nullio: 639 match_int(args, &arg); 640 if (arg != 1) 641 break; 642 643 pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); 644 rd_dev->rd_flags |= RDF_NULLIO; 645 break; 646 default: 647 break; 648 } 649 } 650 651 kfree(orig); 652 return (!ret) ? count : ret; 653 } 654 655 static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) 656 { 657 struct rd_dev *rd_dev = RD_DEV(dev); 658 659 ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", 660 rd_dev->rd_dev_id); 661 bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" 662 " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, 663 PAGE_SIZE, rd_dev->sg_table_count, 664 !!(rd_dev->rd_flags & RDF_NULLIO)); 665 return bl; 666 } 667 668 static sector_t rd_get_blocks(struct se_device *dev) 669 { 670 struct rd_dev *rd_dev = RD_DEV(dev); 671 672 unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / 673 dev->dev_attrib.block_size) - 1; 674 675 return blocks_long; 676 } 677 678 static int rd_init_prot(struct se_device *dev) 679 { 680 struct rd_dev *rd_dev = RD_DEV(dev); 681 682 if (!dev->dev_attrib.pi_prot_type) 683 return 0; 684 685 return rd_build_prot_space(rd_dev, dev->prot_length, 686 dev->dev_attrib.block_size); 687 } 688 689 static void rd_free_prot(struct se_device *dev) 690 { 691 struct rd_dev *rd_dev = RD_DEV(dev); 692 693 rd_release_prot_space(rd_dev); 694 } 695 696 static struct sbc_ops rd_sbc_ops = { 697 .execute_rw = rd_execute_rw, 698 }; 699 700 static sense_reason_t 701 rd_parse_cdb(struct se_cmd *cmd) 702 { 703 return sbc_parse_cdb(cmd, &rd_sbc_ops); 704 } 705 706 static const struct target_backend_ops rd_mcp_ops = { 707 .name = "rd_mcp", 708 .inquiry_prod = "RAMDISK-MCP", 709 .inquiry_rev = RD_MCP_VERSION, 710 .attach_hba = rd_attach_hba, 711 .detach_hba = rd_detach_hba, 712 .alloc_device = rd_alloc_device, 713 .configure_device = rd_configure_device, 714 .free_device = rd_free_device, 715 .parse_cdb = rd_parse_cdb, 716 .set_configfs_dev_params = rd_set_configfs_dev_params, 717 .show_configfs_dev_params = rd_show_configfs_dev_params, 718 .get_device_type = sbc_get_device_type, 719 .get_blocks = rd_get_blocks, 720 .init_prot = rd_init_prot, 721 .free_prot = rd_free_prot, 722 .tb_dev_attrib_attrs = sbc_attrib_attrs, 723 }; 724 725 int __init rd_module_init(void) 726 { 727 return transport_backend_register(&rd_mcp_ops); 728 } 729 730 void rd_module_exit(void) 731 { 732 target_backend_unregister(&rd_mcp_ops); 733 } 734