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 #include <target/target_core_backend_configfs.h> 38 39 #include "target_core_rd.h" 40 41 static inline struct rd_dev *RD_DEV(struct se_device *dev) 42 { 43 return container_of(dev, struct rd_dev, dev); 44 } 45 46 /* rd_attach_hba(): (Part of se_subsystem_api_t template) 47 * 48 * 49 */ 50 static int rd_attach_hba(struct se_hba *hba, u32 host_id) 51 { 52 struct rd_host *rd_host; 53 54 rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); 55 if (!rd_host) { 56 pr_err("Unable to allocate memory for struct rd_host\n"); 57 return -ENOMEM; 58 } 59 60 rd_host->rd_host_id = host_id; 61 62 hba->hba_ptr = rd_host; 63 64 pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" 65 " Generic Target Core Stack %s\n", hba->hba_id, 66 RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); 67 68 return 0; 69 } 70 71 static void rd_detach_hba(struct se_hba *hba) 72 { 73 struct rd_host *rd_host = hba->hba_ptr; 74 75 pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" 76 " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); 77 78 kfree(rd_host); 79 hba->hba_ptr = NULL; 80 } 81 82 static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, 83 u32 sg_table_count) 84 { 85 struct page *pg; 86 struct scatterlist *sg; 87 u32 i, j, page_count = 0, sg_per_table; 88 89 for (i = 0; i < sg_table_count; i++) { 90 sg = sg_table[i].sg_table; 91 sg_per_table = sg_table[i].rd_sg_count; 92 93 for (j = 0; j < sg_per_table; j++) { 94 pg = sg_page(&sg[j]); 95 if (pg) { 96 __free_page(pg); 97 page_count++; 98 } 99 } 100 kfree(sg); 101 } 102 103 kfree(sg_table); 104 return page_count; 105 } 106 107 static void rd_release_device_space(struct rd_dev *rd_dev) 108 { 109 u32 page_count; 110 111 if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) 112 return; 113 114 page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array, 115 rd_dev->sg_table_count); 116 117 pr_debug("CORE_RD[%u] - Released device space for Ramdisk" 118 " Device ID: %u, pages %u in %u tables total bytes %lu\n", 119 rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, 120 rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); 121 122 rd_dev->sg_table_array = NULL; 123 rd_dev->sg_table_count = 0; 124 } 125 126 127 /* rd_build_device_space(): 128 * 129 * 130 */ 131 static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, 132 u32 total_sg_needed, unsigned char init_payload) 133 { 134 u32 i = 0, j, page_offset = 0, sg_per_table; 135 u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / 136 sizeof(struct scatterlist)); 137 struct page *pg; 138 struct scatterlist *sg; 139 unsigned char *p; 140 141 while (total_sg_needed) { 142 unsigned int chain_entry = 0; 143 144 sg_per_table = (total_sg_needed > max_sg_per_table) ? 145 max_sg_per_table : total_sg_needed; 146 147 #ifdef CONFIG_ARCH_HAS_SG_CHAIN 148 149 /* 150 * Reserve extra element for chain entry 151 */ 152 if (sg_per_table < total_sg_needed) 153 chain_entry = 1; 154 155 #endif /* CONFIG_ARCH_HAS_SG_CHAIN */ 156 157 sg = kcalloc(sg_per_table + chain_entry, sizeof(*sg), 158 GFP_KERNEL); 159 if (!sg) { 160 pr_err("Unable to allocate scatterlist array" 161 " for struct rd_dev\n"); 162 return -ENOMEM; 163 } 164 165 sg_init_table(sg, sg_per_table + chain_entry); 166 167 #ifdef CONFIG_ARCH_HAS_SG_CHAIN 168 169 if (i > 0) { 170 sg_chain(sg_table[i - 1].sg_table, 171 max_sg_per_table + 1, sg); 172 } 173 174 #endif /* CONFIG_ARCH_HAS_SG_CHAIN */ 175 176 sg_table[i].sg_table = sg; 177 sg_table[i].rd_sg_count = sg_per_table; 178 sg_table[i].page_start_offset = page_offset; 179 sg_table[i++].page_end_offset = (page_offset + sg_per_table) 180 - 1; 181 182 for (j = 0; j < sg_per_table; j++) { 183 pg = alloc_pages(GFP_KERNEL, 0); 184 if (!pg) { 185 pr_err("Unable to allocate scatterlist" 186 " pages for struct rd_dev_sg_table\n"); 187 return -ENOMEM; 188 } 189 sg_assign_page(&sg[j], pg); 190 sg[j].length = PAGE_SIZE; 191 192 p = kmap(pg); 193 memset(p, init_payload, PAGE_SIZE); 194 kunmap(pg); 195 } 196 197 page_offset += sg_per_table; 198 total_sg_needed -= sg_per_table; 199 } 200 201 return 0; 202 } 203 204 static int rd_build_device_space(struct rd_dev *rd_dev) 205 { 206 struct rd_dev_sg_table *sg_table; 207 u32 sg_tables, total_sg_needed; 208 u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / 209 sizeof(struct scatterlist)); 210 int rc; 211 212 if (rd_dev->rd_page_count <= 0) { 213 pr_err("Illegal page count: %u for Ramdisk device\n", 214 rd_dev->rd_page_count); 215 return -EINVAL; 216 } 217 218 /* Don't need backing pages for NULLIO */ 219 if (rd_dev->rd_flags & RDF_NULLIO) 220 return 0; 221 222 total_sg_needed = rd_dev->rd_page_count; 223 224 sg_tables = (total_sg_needed / max_sg_per_table) + 1; 225 226 sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); 227 if (!sg_table) { 228 pr_err("Unable to allocate memory for Ramdisk" 229 " scatterlist tables\n"); 230 return -ENOMEM; 231 } 232 233 rd_dev->sg_table_array = sg_table; 234 rd_dev->sg_table_count = sg_tables; 235 236 rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00); 237 if (rc) 238 return rc; 239 240 pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" 241 " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, 242 rd_dev->rd_dev_id, rd_dev->rd_page_count, 243 rd_dev->sg_table_count); 244 245 return 0; 246 } 247 248 static void rd_release_prot_space(struct rd_dev *rd_dev) 249 { 250 u32 page_count; 251 252 if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count) 253 return; 254 255 page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array, 256 rd_dev->sg_prot_count); 257 258 pr_debug("CORE_RD[%u] - Released protection space for Ramdisk" 259 " Device ID: %u, pages %u in %u tables total bytes %lu\n", 260 rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, 261 rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); 262 263 rd_dev->sg_prot_array = NULL; 264 rd_dev->sg_prot_count = 0; 265 } 266 267 static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size) 268 { 269 struct rd_dev_sg_table *sg_table; 270 u32 total_sg_needed, sg_tables; 271 u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / 272 sizeof(struct scatterlist)); 273 int rc; 274 275 if (rd_dev->rd_flags & RDF_NULLIO) 276 return 0; 277 /* 278 * prot_length=8byte dif data 279 * tot sg needed = rd_page_count * (PGSZ/block_size) * 280 * (prot_length/block_size) + pad 281 * PGSZ canceled each other. 282 */ 283 total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1; 284 285 sg_tables = (total_sg_needed / max_sg_per_table) + 1; 286 287 sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); 288 if (!sg_table) { 289 pr_err("Unable to allocate memory for Ramdisk protection" 290 " scatterlist tables\n"); 291 return -ENOMEM; 292 } 293 294 rd_dev->sg_prot_array = sg_table; 295 rd_dev->sg_prot_count = sg_tables; 296 297 rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff); 298 if (rc) 299 return rc; 300 301 pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of" 302 " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, 303 rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count); 304 305 return 0; 306 } 307 308 static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name) 309 { 310 struct rd_dev *rd_dev; 311 struct rd_host *rd_host = hba->hba_ptr; 312 313 rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); 314 if (!rd_dev) { 315 pr_err("Unable to allocate memory for struct rd_dev\n"); 316 return NULL; 317 } 318 319 rd_dev->rd_host = rd_host; 320 321 return &rd_dev->dev; 322 } 323 324 static int rd_configure_device(struct se_device *dev) 325 { 326 struct rd_dev *rd_dev = RD_DEV(dev); 327 struct rd_host *rd_host = dev->se_hba->hba_ptr; 328 int ret; 329 330 if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { 331 pr_debug("Missing rd_pages= parameter\n"); 332 return -EINVAL; 333 } 334 335 ret = rd_build_device_space(rd_dev); 336 if (ret < 0) 337 goto fail; 338 339 dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; 340 dev->dev_attrib.hw_max_sectors = UINT_MAX; 341 dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; 342 343 rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; 344 345 pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of" 346 " %u pages in %u tables, %lu total bytes\n", 347 rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count, 348 rd_dev->sg_table_count, 349 (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); 350 351 return 0; 352 353 fail: 354 rd_release_device_space(rd_dev); 355 return ret; 356 } 357 358 static void rd_free_device(struct se_device *dev) 359 { 360 struct rd_dev *rd_dev = RD_DEV(dev); 361 362 rd_release_device_space(rd_dev); 363 kfree(rd_dev); 364 } 365 366 static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) 367 { 368 struct rd_dev_sg_table *sg_table; 369 u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / 370 sizeof(struct scatterlist)); 371 372 i = page / sg_per_table; 373 if (i < rd_dev->sg_table_count) { 374 sg_table = &rd_dev->sg_table_array[i]; 375 if ((sg_table->page_start_offset <= page) && 376 (sg_table->page_end_offset >= page)) 377 return sg_table; 378 } 379 380 pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", 381 page); 382 383 return NULL; 384 } 385 386 static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page) 387 { 388 struct rd_dev_sg_table *sg_table; 389 u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / 390 sizeof(struct scatterlist)); 391 392 i = page / sg_per_table; 393 if (i < rd_dev->sg_prot_count) { 394 sg_table = &rd_dev->sg_prot_array[i]; 395 if ((sg_table->page_start_offset <= page) && 396 (sg_table->page_end_offset >= page)) 397 return sg_table; 398 } 399 400 pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n", 401 page); 402 403 return NULL; 404 } 405 406 static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read) 407 { 408 struct se_device *se_dev = cmd->se_dev; 409 struct rd_dev *dev = RD_DEV(se_dev); 410 struct rd_dev_sg_table *prot_table; 411 bool need_to_release = false; 412 struct scatterlist *prot_sg; 413 u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size; 414 u32 prot_offset, prot_page; 415 u32 prot_npages __maybe_unused; 416 u64 tmp; 417 sense_reason_t rc = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 418 419 tmp = cmd->t_task_lba * se_dev->prot_length; 420 prot_offset = do_div(tmp, PAGE_SIZE); 421 prot_page = tmp; 422 423 prot_table = rd_get_prot_table(dev, prot_page); 424 if (!prot_table) 425 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 426 427 prot_sg = &prot_table->sg_table[prot_page - 428 prot_table->page_start_offset]; 429 430 #ifndef CONFIG_ARCH_HAS_SG_CHAIN 431 432 prot_npages = DIV_ROUND_UP(prot_offset + sectors * se_dev->prot_length, 433 PAGE_SIZE); 434 435 /* 436 * Allocate temporaly contiguous scatterlist entries if prot pages 437 * straddles multiple scatterlist tables. 438 */ 439 if (prot_table->page_end_offset < prot_page + prot_npages - 1) { 440 int i; 441 442 prot_sg = kcalloc(prot_npages, sizeof(*prot_sg), GFP_KERNEL); 443 if (!prot_sg) 444 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 445 446 need_to_release = true; 447 sg_init_table(prot_sg, prot_npages); 448 449 for (i = 0; i < prot_npages; i++) { 450 if (prot_page + i > prot_table->page_end_offset) { 451 prot_table = rd_get_prot_table(dev, 452 prot_page + i); 453 if (!prot_table) { 454 kfree(prot_sg); 455 return rc; 456 } 457 sg_unmark_end(&prot_sg[i - 1]); 458 } 459 prot_sg[i] = prot_table->sg_table[prot_page + i - 460 prot_table->page_start_offset]; 461 } 462 } 463 464 #endif /* !CONFIG_ARCH_HAS_SG_CHAIN */ 465 466 if (is_read) 467 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, 468 prot_sg, prot_offset); 469 else 470 rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, 471 cmd->t_prot_sg, 0); 472 473 if (!rc) 474 sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset); 475 476 if (need_to_release) 477 kfree(prot_sg); 478 479 return rc; 480 } 481 482 static sense_reason_t 483 rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 484 enum dma_data_direction data_direction) 485 { 486 struct se_device *se_dev = cmd->se_dev; 487 struct rd_dev *dev = RD_DEV(se_dev); 488 struct rd_dev_sg_table *table; 489 struct scatterlist *rd_sg; 490 struct sg_mapping_iter m; 491 u32 rd_offset; 492 u32 rd_size; 493 u32 rd_page; 494 u32 src_len; 495 u64 tmp; 496 sense_reason_t rc; 497 498 if (dev->rd_flags & RDF_NULLIO) { 499 target_complete_cmd(cmd, SAM_STAT_GOOD); 500 return 0; 501 } 502 503 tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; 504 rd_offset = do_div(tmp, PAGE_SIZE); 505 rd_page = tmp; 506 rd_size = cmd->data_length; 507 508 table = rd_get_sg_table(dev, rd_page); 509 if (!table) 510 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 511 512 rd_sg = &table->sg_table[rd_page - table->page_start_offset]; 513 514 pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", 515 dev->rd_dev_id, 516 data_direction == DMA_FROM_DEVICE ? "Read" : "Write", 517 cmd->t_task_lba, rd_size, rd_page, rd_offset); 518 519 if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && 520 data_direction == DMA_TO_DEVICE) { 521 rc = rd_do_prot_rw(cmd, false); 522 if (rc) 523 return rc; 524 } 525 526 src_len = PAGE_SIZE - rd_offset; 527 sg_miter_start(&m, sgl, sgl_nents, 528 data_direction == DMA_FROM_DEVICE ? 529 SG_MITER_TO_SG : SG_MITER_FROM_SG); 530 while (rd_size) { 531 u32 len; 532 void *rd_addr; 533 534 sg_miter_next(&m); 535 if (!(u32)m.length) { 536 pr_debug("RD[%u]: invalid sgl %p len %zu\n", 537 dev->rd_dev_id, m.addr, m.length); 538 sg_miter_stop(&m); 539 return TCM_INCORRECT_AMOUNT_OF_DATA; 540 } 541 len = min((u32)m.length, src_len); 542 if (len > rd_size) { 543 pr_debug("RD[%u]: size underrun page %d offset %d " 544 "size %d\n", dev->rd_dev_id, 545 rd_page, rd_offset, rd_size); 546 len = rd_size; 547 } 548 m.consumed = len; 549 550 rd_addr = sg_virt(rd_sg) + rd_offset; 551 552 if (data_direction == DMA_FROM_DEVICE) 553 memcpy(m.addr, rd_addr, len); 554 else 555 memcpy(rd_addr, m.addr, len); 556 557 rd_size -= len; 558 if (!rd_size) 559 continue; 560 561 src_len -= len; 562 if (src_len) { 563 rd_offset += len; 564 continue; 565 } 566 567 /* rd page completed, next one please */ 568 rd_page++; 569 rd_offset = 0; 570 src_len = PAGE_SIZE; 571 if (rd_page <= table->page_end_offset) { 572 rd_sg++; 573 continue; 574 } 575 576 table = rd_get_sg_table(dev, rd_page); 577 if (!table) { 578 sg_miter_stop(&m); 579 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 580 } 581 582 /* since we increment, the first sg entry is correct */ 583 rd_sg = table->sg_table; 584 } 585 sg_miter_stop(&m); 586 587 if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && 588 data_direction == DMA_FROM_DEVICE) { 589 rc = rd_do_prot_rw(cmd, true); 590 if (rc) 591 return rc; 592 } 593 594 target_complete_cmd(cmd, SAM_STAT_GOOD); 595 return 0; 596 } 597 598 enum { 599 Opt_rd_pages, Opt_rd_nullio, Opt_err 600 }; 601 602 static match_table_t tokens = { 603 {Opt_rd_pages, "rd_pages=%d"}, 604 {Opt_rd_nullio, "rd_nullio=%d"}, 605 {Opt_err, NULL} 606 }; 607 608 static ssize_t rd_set_configfs_dev_params(struct se_device *dev, 609 const char *page, ssize_t count) 610 { 611 struct rd_dev *rd_dev = RD_DEV(dev); 612 char *orig, *ptr, *opts; 613 substring_t args[MAX_OPT_ARGS]; 614 int ret = 0, arg, token; 615 616 opts = kstrdup(page, GFP_KERNEL); 617 if (!opts) 618 return -ENOMEM; 619 620 orig = opts; 621 622 while ((ptr = strsep(&opts, ",\n")) != NULL) { 623 if (!*ptr) 624 continue; 625 626 token = match_token(ptr, tokens, args); 627 switch (token) { 628 case Opt_rd_pages: 629 match_int(args, &arg); 630 rd_dev->rd_page_count = arg; 631 pr_debug("RAMDISK: Referencing Page" 632 " Count: %u\n", rd_dev->rd_page_count); 633 rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; 634 break; 635 case Opt_rd_nullio: 636 match_int(args, &arg); 637 if (arg != 1) 638 break; 639 640 pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); 641 rd_dev->rd_flags |= RDF_NULLIO; 642 break; 643 default: 644 break; 645 } 646 } 647 648 kfree(orig); 649 return (!ret) ? count : ret; 650 } 651 652 static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) 653 { 654 struct rd_dev *rd_dev = RD_DEV(dev); 655 656 ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", 657 rd_dev->rd_dev_id); 658 bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" 659 " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, 660 PAGE_SIZE, rd_dev->sg_table_count, 661 !!(rd_dev->rd_flags & RDF_NULLIO)); 662 return bl; 663 } 664 665 static sector_t rd_get_blocks(struct se_device *dev) 666 { 667 struct rd_dev *rd_dev = RD_DEV(dev); 668 669 unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / 670 dev->dev_attrib.block_size) - 1; 671 672 return blocks_long; 673 } 674 675 static int rd_init_prot(struct se_device *dev) 676 { 677 struct rd_dev *rd_dev = RD_DEV(dev); 678 679 if (!dev->dev_attrib.pi_prot_type) 680 return 0; 681 682 return rd_build_prot_space(rd_dev, dev->prot_length, 683 dev->dev_attrib.block_size); 684 } 685 686 static void rd_free_prot(struct se_device *dev) 687 { 688 struct rd_dev *rd_dev = RD_DEV(dev); 689 690 rd_release_prot_space(rd_dev); 691 } 692 693 static struct sbc_ops rd_sbc_ops = { 694 .execute_rw = rd_execute_rw, 695 }; 696 697 static sense_reason_t 698 rd_parse_cdb(struct se_cmd *cmd) 699 { 700 return sbc_parse_cdb(cmd, &rd_sbc_ops); 701 } 702 703 DEF_TB_DEFAULT_ATTRIBS(rd_mcp); 704 705 static struct configfs_attribute *rd_mcp_backend_dev_attrs[] = { 706 &rd_mcp_dev_attrib_emulate_model_alias.attr, 707 &rd_mcp_dev_attrib_emulate_dpo.attr, 708 &rd_mcp_dev_attrib_emulate_fua_write.attr, 709 &rd_mcp_dev_attrib_emulate_fua_read.attr, 710 &rd_mcp_dev_attrib_emulate_write_cache.attr, 711 &rd_mcp_dev_attrib_emulate_ua_intlck_ctrl.attr, 712 &rd_mcp_dev_attrib_emulate_tas.attr, 713 &rd_mcp_dev_attrib_emulate_tpu.attr, 714 &rd_mcp_dev_attrib_emulate_tpws.attr, 715 &rd_mcp_dev_attrib_emulate_caw.attr, 716 &rd_mcp_dev_attrib_emulate_3pc.attr, 717 &rd_mcp_dev_attrib_pi_prot_type.attr, 718 &rd_mcp_dev_attrib_hw_pi_prot_type.attr, 719 &rd_mcp_dev_attrib_pi_prot_format.attr, 720 &rd_mcp_dev_attrib_enforce_pr_isids.attr, 721 &rd_mcp_dev_attrib_is_nonrot.attr, 722 &rd_mcp_dev_attrib_emulate_rest_reord.attr, 723 &rd_mcp_dev_attrib_force_pr_aptpl.attr, 724 &rd_mcp_dev_attrib_hw_block_size.attr, 725 &rd_mcp_dev_attrib_block_size.attr, 726 &rd_mcp_dev_attrib_hw_max_sectors.attr, 727 &rd_mcp_dev_attrib_optimal_sectors.attr, 728 &rd_mcp_dev_attrib_hw_queue_depth.attr, 729 &rd_mcp_dev_attrib_queue_depth.attr, 730 &rd_mcp_dev_attrib_max_unmap_lba_count.attr, 731 &rd_mcp_dev_attrib_max_unmap_block_desc_count.attr, 732 &rd_mcp_dev_attrib_unmap_granularity.attr, 733 &rd_mcp_dev_attrib_unmap_granularity_alignment.attr, 734 &rd_mcp_dev_attrib_max_write_same_len.attr, 735 NULL, 736 }; 737 738 static struct se_subsystem_api rd_mcp_template = { 739 .name = "rd_mcp", 740 .inquiry_prod = "RAMDISK-MCP", 741 .inquiry_rev = RD_MCP_VERSION, 742 .attach_hba = rd_attach_hba, 743 .detach_hba = rd_detach_hba, 744 .alloc_device = rd_alloc_device, 745 .configure_device = rd_configure_device, 746 .free_device = rd_free_device, 747 .parse_cdb = rd_parse_cdb, 748 .set_configfs_dev_params = rd_set_configfs_dev_params, 749 .show_configfs_dev_params = rd_show_configfs_dev_params, 750 .get_device_type = sbc_get_device_type, 751 .get_blocks = rd_get_blocks, 752 .init_prot = rd_init_prot, 753 .free_prot = rd_free_prot, 754 }; 755 756 int __init rd_module_init(void) 757 { 758 struct target_backend_cits *tbc = &rd_mcp_template.tb_cits; 759 int ret; 760 761 target_core_setup_sub_cits(&rd_mcp_template); 762 tbc->tb_dev_attrib_cit.ct_attrs = rd_mcp_backend_dev_attrs; 763 764 ret = transport_subsystem_register(&rd_mcp_template); 765 if (ret < 0) { 766 return ret; 767 } 768 769 return 0; 770 } 771 772 void rd_module_exit(void) 773 { 774 transport_subsystem_release(&rd_mcp_template); 775 } 776