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 41static 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 */ 50static 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 71static 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 82static 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 107static 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 */ 131static 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 204static 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 248static 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 267static 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 308static 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 324static 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 353fail: 354 rd_release_device_space(rd_dev); 355 return ret; 356} 357 358static 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 366static 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 386static 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 406typedef sense_reason_t (*dif_verify)(struct se_cmd *, sector_t, unsigned int, 407 unsigned int, struct scatterlist *, int); 408 409static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, dif_verify dif_verify) 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 rc = dif_verify(cmd, cmd->t_task_lba, sectors, 0, prot_sg, prot_offset); 470 if (need_to_release) 471 kfree(prot_sg); 472 473 return rc; 474} 475 476static sense_reason_t 477rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, 478 enum dma_data_direction data_direction) 479{ 480 struct se_device *se_dev = cmd->se_dev; 481 struct rd_dev *dev = RD_DEV(se_dev); 482 struct rd_dev_sg_table *table; 483 struct scatterlist *rd_sg; 484 struct sg_mapping_iter m; 485 u32 rd_offset; 486 u32 rd_size; 487 u32 rd_page; 488 u32 src_len; 489 u64 tmp; 490 sense_reason_t rc; 491 492 if (dev->rd_flags & RDF_NULLIO) { 493 target_complete_cmd(cmd, SAM_STAT_GOOD); 494 return 0; 495 } 496 497 tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; 498 rd_offset = do_div(tmp, PAGE_SIZE); 499 rd_page = tmp; 500 rd_size = cmd->data_length; 501 502 table = rd_get_sg_table(dev, rd_page); 503 if (!table) 504 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 505 506 rd_sg = &table->sg_table[rd_page - table->page_start_offset]; 507 508 pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", 509 dev->rd_dev_id, 510 data_direction == DMA_FROM_DEVICE ? "Read" : "Write", 511 cmd->t_task_lba, rd_size, rd_page, rd_offset); 512 513 if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && 514 data_direction == DMA_TO_DEVICE) { 515 rc = rd_do_prot_rw(cmd, sbc_dif_verify_write); 516 if (rc) 517 return rc; 518 } 519 520 src_len = PAGE_SIZE - rd_offset; 521 sg_miter_start(&m, sgl, sgl_nents, 522 data_direction == DMA_FROM_DEVICE ? 523 SG_MITER_TO_SG : SG_MITER_FROM_SG); 524 while (rd_size) { 525 u32 len; 526 void *rd_addr; 527 528 sg_miter_next(&m); 529 if (!(u32)m.length) { 530 pr_debug("RD[%u]: invalid sgl %p len %zu\n", 531 dev->rd_dev_id, m.addr, m.length); 532 sg_miter_stop(&m); 533 return TCM_INCORRECT_AMOUNT_OF_DATA; 534 } 535 len = min((u32)m.length, src_len); 536 if (len > rd_size) { 537 pr_debug("RD[%u]: size underrun page %d offset %d " 538 "size %d\n", dev->rd_dev_id, 539 rd_page, rd_offset, rd_size); 540 len = rd_size; 541 } 542 m.consumed = len; 543 544 rd_addr = sg_virt(rd_sg) + rd_offset; 545 546 if (data_direction == DMA_FROM_DEVICE) 547 memcpy(m.addr, rd_addr, len); 548 else 549 memcpy(rd_addr, m.addr, len); 550 551 rd_size -= len; 552 if (!rd_size) 553 continue; 554 555 src_len -= len; 556 if (src_len) { 557 rd_offset += len; 558 continue; 559 } 560 561 /* rd page completed, next one please */ 562 rd_page++; 563 rd_offset = 0; 564 src_len = PAGE_SIZE; 565 if (rd_page <= table->page_end_offset) { 566 rd_sg++; 567 continue; 568 } 569 570 table = rd_get_sg_table(dev, rd_page); 571 if (!table) { 572 sg_miter_stop(&m); 573 return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; 574 } 575 576 /* since we increment, the first sg entry is correct */ 577 rd_sg = table->sg_table; 578 } 579 sg_miter_stop(&m); 580 581 if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && 582 data_direction == DMA_FROM_DEVICE) { 583 rc = rd_do_prot_rw(cmd, sbc_dif_verify_read); 584 if (rc) 585 return rc; 586 } 587 588 target_complete_cmd(cmd, SAM_STAT_GOOD); 589 return 0; 590} 591 592enum { 593 Opt_rd_pages, Opt_rd_nullio, Opt_err 594}; 595 596static match_table_t tokens = { 597 {Opt_rd_pages, "rd_pages=%d"}, 598 {Opt_rd_nullio, "rd_nullio=%d"}, 599 {Opt_err, NULL} 600}; 601 602static ssize_t rd_set_configfs_dev_params(struct se_device *dev, 603 const char *page, ssize_t count) 604{ 605 struct rd_dev *rd_dev = RD_DEV(dev); 606 char *orig, *ptr, *opts; 607 substring_t args[MAX_OPT_ARGS]; 608 int ret = 0, arg, token; 609 610 opts = kstrdup(page, GFP_KERNEL); 611 if (!opts) 612 return -ENOMEM; 613 614 orig = opts; 615 616 while ((ptr = strsep(&opts, ",\n")) != NULL) { 617 if (!*ptr) 618 continue; 619 620 token = match_token(ptr, tokens, args); 621 switch (token) { 622 case Opt_rd_pages: 623 match_int(args, &arg); 624 rd_dev->rd_page_count = arg; 625 pr_debug("RAMDISK: Referencing Page" 626 " Count: %u\n", rd_dev->rd_page_count); 627 rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; 628 break; 629 case Opt_rd_nullio: 630 match_int(args, &arg); 631 if (arg != 1) 632 break; 633 634 pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); 635 rd_dev->rd_flags |= RDF_NULLIO; 636 break; 637 default: 638 break; 639 } 640 } 641 642 kfree(orig); 643 return (!ret) ? count : ret; 644} 645 646static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) 647{ 648 struct rd_dev *rd_dev = RD_DEV(dev); 649 650 ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", 651 rd_dev->rd_dev_id); 652 bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" 653 " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, 654 PAGE_SIZE, rd_dev->sg_table_count, 655 !!(rd_dev->rd_flags & RDF_NULLIO)); 656 return bl; 657} 658 659static sector_t rd_get_blocks(struct se_device *dev) 660{ 661 struct rd_dev *rd_dev = RD_DEV(dev); 662 663 unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / 664 dev->dev_attrib.block_size) - 1; 665 666 return blocks_long; 667} 668 669static int rd_init_prot(struct se_device *dev) 670{ 671 struct rd_dev *rd_dev = RD_DEV(dev); 672 673 if (!dev->dev_attrib.pi_prot_type) 674 return 0; 675 676 return rd_build_prot_space(rd_dev, dev->prot_length, 677 dev->dev_attrib.block_size); 678} 679 680static void rd_free_prot(struct se_device *dev) 681{ 682 struct rd_dev *rd_dev = RD_DEV(dev); 683 684 rd_release_prot_space(rd_dev); 685} 686 687static struct sbc_ops rd_sbc_ops = { 688 .execute_rw = rd_execute_rw, 689}; 690 691static sense_reason_t 692rd_parse_cdb(struct se_cmd *cmd) 693{ 694 return sbc_parse_cdb(cmd, &rd_sbc_ops); 695} 696 697DEF_TB_DEFAULT_ATTRIBS(rd_mcp); 698 699static struct configfs_attribute *rd_mcp_backend_dev_attrs[] = { 700 &rd_mcp_dev_attrib_emulate_model_alias.attr, 701 &rd_mcp_dev_attrib_emulate_dpo.attr, 702 &rd_mcp_dev_attrib_emulate_fua_write.attr, 703 &rd_mcp_dev_attrib_emulate_fua_read.attr, 704 &rd_mcp_dev_attrib_emulate_write_cache.attr, 705 &rd_mcp_dev_attrib_emulate_ua_intlck_ctrl.attr, 706 &rd_mcp_dev_attrib_emulate_tas.attr, 707 &rd_mcp_dev_attrib_emulate_tpu.attr, 708 &rd_mcp_dev_attrib_emulate_tpws.attr, 709 &rd_mcp_dev_attrib_emulate_caw.attr, 710 &rd_mcp_dev_attrib_emulate_3pc.attr, 711 &rd_mcp_dev_attrib_pi_prot_type.attr, 712 &rd_mcp_dev_attrib_hw_pi_prot_type.attr, 713 &rd_mcp_dev_attrib_pi_prot_format.attr, 714 &rd_mcp_dev_attrib_enforce_pr_isids.attr, 715 &rd_mcp_dev_attrib_is_nonrot.attr, 716 &rd_mcp_dev_attrib_emulate_rest_reord.attr, 717 &rd_mcp_dev_attrib_force_pr_aptpl.attr, 718 &rd_mcp_dev_attrib_hw_block_size.attr, 719 &rd_mcp_dev_attrib_block_size.attr, 720 &rd_mcp_dev_attrib_hw_max_sectors.attr, 721 &rd_mcp_dev_attrib_optimal_sectors.attr, 722 &rd_mcp_dev_attrib_hw_queue_depth.attr, 723 &rd_mcp_dev_attrib_queue_depth.attr, 724 &rd_mcp_dev_attrib_max_unmap_lba_count.attr, 725 &rd_mcp_dev_attrib_max_unmap_block_desc_count.attr, 726 &rd_mcp_dev_attrib_unmap_granularity.attr, 727 &rd_mcp_dev_attrib_unmap_granularity_alignment.attr, 728 &rd_mcp_dev_attrib_max_write_same_len.attr, 729 NULL, 730}; 731 732static struct se_subsystem_api rd_mcp_template = { 733 .name = "rd_mcp", 734 .inquiry_prod = "RAMDISK-MCP", 735 .inquiry_rev = RD_MCP_VERSION, 736 .attach_hba = rd_attach_hba, 737 .detach_hba = rd_detach_hba, 738 .alloc_device = rd_alloc_device, 739 .configure_device = rd_configure_device, 740 .free_device = rd_free_device, 741 .parse_cdb = rd_parse_cdb, 742 .set_configfs_dev_params = rd_set_configfs_dev_params, 743 .show_configfs_dev_params = rd_show_configfs_dev_params, 744 .get_device_type = sbc_get_device_type, 745 .get_blocks = rd_get_blocks, 746 .init_prot = rd_init_prot, 747 .free_prot = rd_free_prot, 748}; 749 750int __init rd_module_init(void) 751{ 752 struct target_backend_cits *tbc = &rd_mcp_template.tb_cits; 753 int ret; 754 755 target_core_setup_sub_cits(&rd_mcp_template); 756 tbc->tb_dev_attrib_cit.ct_attrs = rd_mcp_backend_dev_attrs; 757 758 ret = transport_subsystem_register(&rd_mcp_template); 759 if (ret < 0) { 760 return ret; 761 } 762 763 return 0; 764} 765 766void rd_module_exit(void) 767{ 768 transport_subsystem_release(&rd_mcp_template); 769} 770