1 /******************************************************************************* 2 * Filename: target_core_rd.c 3 * 4 * This file contains the Storage Engine <-> Ramdisk transport 5 * specific functions. 6 * 7 * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc. 8 * Copyright (c) 2005, 2006, 2007 SBE, Inc. 9 * Copyright (c) 2007-2010 Rising Tide Systems 10 * Copyright (c) 2008-2010 Linux-iSCSI.org 11 * 12 * Nicholas A. Bellinger <nab@kernel.org> 13 * 14 * This program is free software; you can redistribute it and/or modify 15 * it under the terms of the GNU General Public License as published by 16 * the Free Software Foundation; either version 2 of the License, or 17 * (at your option) any later version. 18 * 19 * This program is distributed in the hope that it will be useful, 20 * but WITHOUT ANY WARRANTY; without even the implied warranty of 21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 22 * GNU General Public License for more details. 23 * 24 * You should have received a copy of the GNU General Public License 25 * along with this program; if not, write to the Free Software 26 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 27 * 28 ******************************************************************************/ 29 30 #include <linux/version.h> 31 #include <linux/string.h> 32 #include <linux/parser.h> 33 #include <linux/timer.h> 34 #include <linux/blkdev.h> 35 #include <linux/slab.h> 36 #include <linux/spinlock.h> 37 #include <scsi/scsi.h> 38 #include <scsi/scsi_host.h> 39 40 #include <target/target_core_base.h> 41 #include <target/target_core_device.h> 42 #include <target/target_core_transport.h> 43 #include <target/target_core_fabric_ops.h> 44 45 #include "target_core_rd.h" 46 47 static struct se_subsystem_api rd_mcp_template; 48 49 /* rd_attach_hba(): (Part of se_subsystem_api_t template) 50 * 51 * 52 */ 53 static int rd_attach_hba(struct se_hba *hba, u32 host_id) 54 { 55 struct rd_host *rd_host; 56 57 rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); 58 if (!rd_host) { 59 pr_err("Unable to allocate memory for struct rd_host\n"); 60 return -ENOMEM; 61 } 62 63 rd_host->rd_host_id = host_id; 64 65 hba->hba_ptr = rd_host; 66 67 pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" 68 " Generic Target Core Stack %s\n", hba->hba_id, 69 RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); 70 pr_debug("CORE_HBA[%d] - Attached Ramdisk HBA: %u to Generic" 71 " MaxSectors: %u\n", hba->hba_id, 72 rd_host->rd_host_id, RD_MAX_SECTORS); 73 74 return 0; 75 } 76 77 static void rd_detach_hba(struct se_hba *hba) 78 { 79 struct rd_host *rd_host = hba->hba_ptr; 80 81 pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" 82 " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); 83 84 kfree(rd_host); 85 hba->hba_ptr = NULL; 86 } 87 88 /* rd_release_device_space(): 89 * 90 * 91 */ 92 static void rd_release_device_space(struct rd_dev *rd_dev) 93 { 94 u32 i, j, page_count = 0, sg_per_table; 95 struct rd_dev_sg_table *sg_table; 96 struct page *pg; 97 struct scatterlist *sg; 98 99 if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) 100 return; 101 102 sg_table = rd_dev->sg_table_array; 103 104 for (i = 0; i < rd_dev->sg_table_count; i++) { 105 sg = sg_table[i].sg_table; 106 sg_per_table = sg_table[i].rd_sg_count; 107 108 for (j = 0; j < sg_per_table; j++) { 109 pg = sg_page(&sg[j]); 110 if (pg) { 111 __free_page(pg); 112 page_count++; 113 } 114 } 115 116 kfree(sg); 117 } 118 119 pr_debug("CORE_RD[%u] - Released device space for Ramdisk" 120 " Device ID: %u, pages %u in %u tables total bytes %lu\n", 121 rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, 122 rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); 123 124 kfree(sg_table); 125 rd_dev->sg_table_array = NULL; 126 rd_dev->sg_table_count = 0; 127 } 128 129 130 /* rd_build_device_space(): 131 * 132 * 133 */ 134 static int rd_build_device_space(struct rd_dev *rd_dev) 135 { 136 u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed; 137 u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / 138 sizeof(struct scatterlist)); 139 struct rd_dev_sg_table *sg_table; 140 struct page *pg; 141 struct scatterlist *sg; 142 143 if (rd_dev->rd_page_count <= 0) { 144 pr_err("Illegal page count: %u for Ramdisk device\n", 145 rd_dev->rd_page_count); 146 return -EINVAL; 147 } 148 total_sg_needed = rd_dev->rd_page_count; 149 150 sg_tables = (total_sg_needed / max_sg_per_table) + 1; 151 152 sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); 153 if (!sg_table) { 154 pr_err("Unable to allocate memory for Ramdisk" 155 " scatterlist tables\n"); 156 return -ENOMEM; 157 } 158 159 rd_dev->sg_table_array = sg_table; 160 rd_dev->sg_table_count = sg_tables; 161 162 while (total_sg_needed) { 163 sg_per_table = (total_sg_needed > max_sg_per_table) ? 164 max_sg_per_table : total_sg_needed; 165 166 sg = kzalloc(sg_per_table * sizeof(struct scatterlist), 167 GFP_KERNEL); 168 if (!sg) { 169 pr_err("Unable to allocate scatterlist array" 170 " for struct rd_dev\n"); 171 return -ENOMEM; 172 } 173 174 sg_init_table(sg, sg_per_table); 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 } 192 193 page_offset += sg_per_table; 194 total_sg_needed -= sg_per_table; 195 } 196 197 pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" 198 " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, 199 rd_dev->rd_dev_id, rd_dev->rd_page_count, 200 rd_dev->sg_table_count); 201 202 return 0; 203 } 204 205 static void *rd_allocate_virtdevice( 206 struct se_hba *hba, 207 const char *name, 208 int rd_direct) 209 { 210 struct rd_dev *rd_dev; 211 struct rd_host *rd_host = hba->hba_ptr; 212 213 rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); 214 if (!rd_dev) { 215 pr_err("Unable to allocate memory for struct rd_dev\n"); 216 return NULL; 217 } 218 219 rd_dev->rd_host = rd_host; 220 rd_dev->rd_direct = rd_direct; 221 222 return rd_dev; 223 } 224 225 static void *rd_MEMCPY_allocate_virtdevice(struct se_hba *hba, const char *name) 226 { 227 return rd_allocate_virtdevice(hba, name, 0); 228 } 229 230 /* rd_create_virtdevice(): 231 * 232 * 233 */ 234 static struct se_device *rd_create_virtdevice( 235 struct se_hba *hba, 236 struct se_subsystem_dev *se_dev, 237 void *p, 238 int rd_direct) 239 { 240 struct se_device *dev; 241 struct se_dev_limits dev_limits; 242 struct rd_dev *rd_dev = p; 243 struct rd_host *rd_host = hba->hba_ptr; 244 int dev_flags = 0, ret; 245 char prod[16], rev[4]; 246 247 memset(&dev_limits, 0, sizeof(struct se_dev_limits)); 248 249 ret = rd_build_device_space(rd_dev); 250 if (ret < 0) 251 goto fail; 252 253 snprintf(prod, 16, "RAMDISK-%s", (rd_dev->rd_direct) ? "DR" : "MCP"); 254 snprintf(rev, 4, "%s", (rd_dev->rd_direct) ? RD_DR_VERSION : 255 RD_MCP_VERSION); 256 257 dev_limits.limits.logical_block_size = RD_BLOCKSIZE; 258 dev_limits.limits.max_hw_sectors = RD_MAX_SECTORS; 259 dev_limits.limits.max_sectors = RD_MAX_SECTORS; 260 dev_limits.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; 261 dev_limits.queue_depth = RD_DEVICE_QUEUE_DEPTH; 262 263 dev = transport_add_device_to_core_hba(hba, 264 &rd_mcp_template, se_dev, dev_flags, rd_dev, 265 &dev_limits, prod, rev); 266 if (!dev) 267 goto fail; 268 269 rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; 270 rd_dev->rd_queue_depth = dev->queue_depth; 271 272 pr_debug("CORE_RD[%u] - Added TCM %s Ramdisk Device ID: %u of" 273 " %u pages in %u tables, %lu total bytes\n", 274 rd_host->rd_host_id, (!rd_dev->rd_direct) ? "MEMCPY" : 275 "DIRECT", rd_dev->rd_dev_id, rd_dev->rd_page_count, 276 rd_dev->sg_table_count, 277 (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); 278 279 return dev; 280 281 fail: 282 rd_release_device_space(rd_dev); 283 return ERR_PTR(ret); 284 } 285 286 static struct se_device *rd_MEMCPY_create_virtdevice( 287 struct se_hba *hba, 288 struct se_subsystem_dev *se_dev, 289 void *p) 290 { 291 return rd_create_virtdevice(hba, se_dev, p, 0); 292 } 293 294 /* rd_free_device(): (Part of se_subsystem_api_t template) 295 * 296 * 297 */ 298 static void rd_free_device(void *p) 299 { 300 struct rd_dev *rd_dev = p; 301 302 rd_release_device_space(rd_dev); 303 kfree(rd_dev); 304 } 305 306 static inline struct rd_request *RD_REQ(struct se_task *task) 307 { 308 return container_of(task, struct rd_request, rd_task); 309 } 310 311 static struct se_task * 312 rd_alloc_task(unsigned char *cdb) 313 { 314 struct rd_request *rd_req; 315 316 rd_req = kzalloc(sizeof(struct rd_request), GFP_KERNEL); 317 if (!rd_req) { 318 pr_err("Unable to allocate struct rd_request\n"); 319 return NULL; 320 } 321 322 return &rd_req->rd_task; 323 } 324 325 /* rd_get_sg_table(): 326 * 327 * 328 */ 329 static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) 330 { 331 u32 i; 332 struct rd_dev_sg_table *sg_table; 333 334 for (i = 0; i < rd_dev->sg_table_count; i++) { 335 sg_table = &rd_dev->sg_table_array[i]; 336 if ((sg_table->page_start_offset <= page) && 337 (sg_table->page_end_offset >= page)) 338 return sg_table; 339 } 340 341 pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", 342 page); 343 344 return NULL; 345 } 346 347 /* rd_MEMCPY_read(): 348 * 349 * 350 */ 351 static int rd_MEMCPY_read(struct rd_request *req) 352 { 353 struct se_task *task = &req->rd_task; 354 struct rd_dev *dev = req->rd_task.se_dev->dev_ptr; 355 struct rd_dev_sg_table *table; 356 struct scatterlist *sg_d, *sg_s; 357 void *dst, *src; 358 u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; 359 u32 length, page_end = 0, table_sg_end; 360 u32 rd_offset = req->rd_offset; 361 362 table = rd_get_sg_table(dev, req->rd_page); 363 if (!table) 364 return -EINVAL; 365 366 table_sg_end = (table->page_end_offset - req->rd_page); 367 sg_d = task->task_sg; 368 sg_s = &table->sg_table[req->rd_page - table->page_start_offset]; 369 370 pr_debug("RD[%u]: Read LBA: %llu, Size: %u Page: %u, Offset:" 371 " %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, 372 req->rd_page, req->rd_offset); 373 374 src_offset = rd_offset; 375 376 while (req->rd_size) { 377 if ((sg_d[i].length - dst_offset) < 378 (sg_s[j].length - src_offset)) { 379 length = (sg_d[i].length - dst_offset); 380 381 pr_debug("Step 1 - sg_d[%d]: %p length: %d" 382 " offset: %u sg_s[%d].length: %u\n", i, 383 &sg_d[i], sg_d[i].length, sg_d[i].offset, j, 384 sg_s[j].length); 385 pr_debug("Step 1 - length: %u dst_offset: %u" 386 " src_offset: %u\n", length, dst_offset, 387 src_offset); 388 389 if (length > req->rd_size) 390 length = req->rd_size; 391 392 dst = sg_virt(&sg_d[i++]) + dst_offset; 393 if (!dst) 394 BUG(); 395 396 src = sg_virt(&sg_s[j]) + src_offset; 397 if (!src) 398 BUG(); 399 400 dst_offset = 0; 401 src_offset = length; 402 page_end = 0; 403 } else { 404 length = (sg_s[j].length - src_offset); 405 406 pr_debug("Step 2 - sg_d[%d]: %p length: %d" 407 " offset: %u sg_s[%d].length: %u\n", i, 408 &sg_d[i], sg_d[i].length, sg_d[i].offset, 409 j, sg_s[j].length); 410 pr_debug("Step 2 - length: %u dst_offset: %u" 411 " src_offset: %u\n", length, dst_offset, 412 src_offset); 413 414 if (length > req->rd_size) 415 length = req->rd_size; 416 417 dst = sg_virt(&sg_d[i]) + dst_offset; 418 if (!dst) 419 BUG(); 420 421 if (sg_d[i].length == length) { 422 i++; 423 dst_offset = 0; 424 } else 425 dst_offset = length; 426 427 src = sg_virt(&sg_s[j++]) + src_offset; 428 if (!src) 429 BUG(); 430 431 src_offset = 0; 432 page_end = 1; 433 } 434 435 memcpy(dst, src, length); 436 437 pr_debug("page: %u, remaining size: %u, length: %u," 438 " i: %u, j: %u\n", req->rd_page, 439 (req->rd_size - length), length, i, j); 440 441 req->rd_size -= length; 442 if (!req->rd_size) 443 return 0; 444 445 if (!page_end) 446 continue; 447 448 if (++req->rd_page <= table->page_end_offset) { 449 pr_debug("page: %u in same page table\n", 450 req->rd_page); 451 continue; 452 } 453 454 pr_debug("getting new page table for page: %u\n", 455 req->rd_page); 456 457 table = rd_get_sg_table(dev, req->rd_page); 458 if (!table) 459 return -EINVAL; 460 461 sg_s = &table->sg_table[j = 0]; 462 } 463 464 return 0; 465 } 466 467 /* rd_MEMCPY_write(): 468 * 469 * 470 */ 471 static int rd_MEMCPY_write(struct rd_request *req) 472 { 473 struct se_task *task = &req->rd_task; 474 struct rd_dev *dev = req->rd_task.se_dev->dev_ptr; 475 struct rd_dev_sg_table *table; 476 struct scatterlist *sg_d, *sg_s; 477 void *dst, *src; 478 u32 i = 0, j = 0, dst_offset = 0, src_offset = 0; 479 u32 length, page_end = 0, table_sg_end; 480 u32 rd_offset = req->rd_offset; 481 482 table = rd_get_sg_table(dev, req->rd_page); 483 if (!table) 484 return -EINVAL; 485 486 table_sg_end = (table->page_end_offset - req->rd_page); 487 sg_d = &table->sg_table[req->rd_page - table->page_start_offset]; 488 sg_s = task->task_sg; 489 490 pr_debug("RD[%d] Write LBA: %llu, Size: %u, Page: %u," 491 " Offset: %u\n", dev->rd_dev_id, task->task_lba, req->rd_size, 492 req->rd_page, req->rd_offset); 493 494 dst_offset = rd_offset; 495 496 while (req->rd_size) { 497 if ((sg_s[i].length - src_offset) < 498 (sg_d[j].length - dst_offset)) { 499 length = (sg_s[i].length - src_offset); 500 501 pr_debug("Step 1 - sg_s[%d]: %p length: %d" 502 " offset: %d sg_d[%d].length: %u\n", i, 503 &sg_s[i], sg_s[i].length, sg_s[i].offset, 504 j, sg_d[j].length); 505 pr_debug("Step 1 - length: %u src_offset: %u" 506 " dst_offset: %u\n", length, src_offset, 507 dst_offset); 508 509 if (length > req->rd_size) 510 length = req->rd_size; 511 512 src = sg_virt(&sg_s[i++]) + src_offset; 513 if (!src) 514 BUG(); 515 516 dst = sg_virt(&sg_d[j]) + dst_offset; 517 if (!dst) 518 BUG(); 519 520 src_offset = 0; 521 dst_offset = length; 522 page_end = 0; 523 } else { 524 length = (sg_d[j].length - dst_offset); 525 526 pr_debug("Step 2 - sg_s[%d]: %p length: %d" 527 " offset: %d sg_d[%d].length: %u\n", i, 528 &sg_s[i], sg_s[i].length, sg_s[i].offset, 529 j, sg_d[j].length); 530 pr_debug("Step 2 - length: %u src_offset: %u" 531 " dst_offset: %u\n", length, src_offset, 532 dst_offset); 533 534 if (length > req->rd_size) 535 length = req->rd_size; 536 537 src = sg_virt(&sg_s[i]) + src_offset; 538 if (!src) 539 BUG(); 540 541 if (sg_s[i].length == length) { 542 i++; 543 src_offset = 0; 544 } else 545 src_offset = length; 546 547 dst = sg_virt(&sg_d[j++]) + dst_offset; 548 if (!dst) 549 BUG(); 550 551 dst_offset = 0; 552 page_end = 1; 553 } 554 555 memcpy(dst, src, length); 556 557 pr_debug("page: %u, remaining size: %u, length: %u," 558 " i: %u, j: %u\n", req->rd_page, 559 (req->rd_size - length), length, i, j); 560 561 req->rd_size -= length; 562 if (!req->rd_size) 563 return 0; 564 565 if (!page_end) 566 continue; 567 568 if (++req->rd_page <= table->page_end_offset) { 569 pr_debug("page: %u in same page table\n", 570 req->rd_page); 571 continue; 572 } 573 574 pr_debug("getting new page table for page: %u\n", 575 req->rd_page); 576 577 table = rd_get_sg_table(dev, req->rd_page); 578 if (!table) 579 return -EINVAL; 580 581 sg_d = &table->sg_table[j = 0]; 582 } 583 584 return 0; 585 } 586 587 /* rd_MEMCPY_do_task(): (Part of se_subsystem_api_t template) 588 * 589 * 590 */ 591 static int rd_MEMCPY_do_task(struct se_task *task) 592 { 593 struct se_device *dev = task->se_dev; 594 struct rd_request *req = RD_REQ(task); 595 unsigned long long lba; 596 int ret; 597 598 req->rd_page = (task->task_lba * dev->se_sub_dev->se_dev_attrib.block_size) / PAGE_SIZE; 599 lba = task->task_lba; 600 req->rd_offset = (do_div(lba, 601 (PAGE_SIZE / dev->se_sub_dev->se_dev_attrib.block_size))) * 602 dev->se_sub_dev->se_dev_attrib.block_size; 603 req->rd_size = task->task_size; 604 605 if (task->task_data_direction == DMA_FROM_DEVICE) 606 ret = rd_MEMCPY_read(req); 607 else 608 ret = rd_MEMCPY_write(req); 609 610 if (ret != 0) 611 return ret; 612 613 task->task_scsi_status = GOOD; 614 transport_complete_task(task, 1); 615 616 return PYX_TRANSPORT_SENT_TO_TRANSPORT; 617 } 618 619 /* rd_free_task(): (Part of se_subsystem_api_t template) 620 * 621 * 622 */ 623 static void rd_free_task(struct se_task *task) 624 { 625 kfree(RD_REQ(task)); 626 } 627 628 enum { 629 Opt_rd_pages, Opt_err 630 }; 631 632 static match_table_t tokens = { 633 {Opt_rd_pages, "rd_pages=%d"}, 634 {Opt_err, NULL} 635 }; 636 637 static ssize_t rd_set_configfs_dev_params( 638 struct se_hba *hba, 639 struct se_subsystem_dev *se_dev, 640 const char *page, 641 ssize_t count) 642 { 643 struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; 644 char *orig, *ptr, *opts; 645 substring_t args[MAX_OPT_ARGS]; 646 int ret = 0, arg, token; 647 648 opts = kstrdup(page, GFP_KERNEL); 649 if (!opts) 650 return -ENOMEM; 651 652 orig = opts; 653 654 while ((ptr = strsep(&opts, ",")) != NULL) { 655 if (!*ptr) 656 continue; 657 658 token = match_token(ptr, tokens, args); 659 switch (token) { 660 case Opt_rd_pages: 661 match_int(args, &arg); 662 rd_dev->rd_page_count = arg; 663 pr_debug("RAMDISK: Referencing Page" 664 " Count: %u\n", rd_dev->rd_page_count); 665 rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; 666 break; 667 default: 668 break; 669 } 670 } 671 672 kfree(orig); 673 return (!ret) ? count : ret; 674 } 675 676 static ssize_t rd_check_configfs_dev_params(struct se_hba *hba, struct se_subsystem_dev *se_dev) 677 { 678 struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; 679 680 if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { 681 pr_debug("Missing rd_pages= parameter\n"); 682 return -EINVAL; 683 } 684 685 return 0; 686 } 687 688 static ssize_t rd_show_configfs_dev_params( 689 struct se_hba *hba, 690 struct se_subsystem_dev *se_dev, 691 char *b) 692 { 693 struct rd_dev *rd_dev = se_dev->se_dev_su_ptr; 694 ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: %s\n", 695 rd_dev->rd_dev_id, (rd_dev->rd_direct) ? 696 "rd_direct" : "rd_mcp"); 697 bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" 698 " SG_table_count: %u\n", rd_dev->rd_page_count, 699 PAGE_SIZE, rd_dev->sg_table_count); 700 return bl; 701 } 702 703 /* rd_get_cdb(): (Part of se_subsystem_api_t template) 704 * 705 * 706 */ 707 static unsigned char *rd_get_cdb(struct se_task *task) 708 { 709 struct rd_request *req = RD_REQ(task); 710 711 return req->rd_scsi_cdb; 712 } 713 714 static u32 rd_get_device_rev(struct se_device *dev) 715 { 716 return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */ 717 } 718 719 static u32 rd_get_device_type(struct se_device *dev) 720 { 721 return TYPE_DISK; 722 } 723 724 static sector_t rd_get_blocks(struct se_device *dev) 725 { 726 struct rd_dev *rd_dev = dev->dev_ptr; 727 unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / 728 dev->se_sub_dev->se_dev_attrib.block_size) - 1; 729 730 return blocks_long; 731 } 732 733 static struct se_subsystem_api rd_mcp_template = { 734 .name = "rd_mcp", 735 .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, 736 .attach_hba = rd_attach_hba, 737 .detach_hba = rd_detach_hba, 738 .allocate_virtdevice = rd_MEMCPY_allocate_virtdevice, 739 .create_virtdevice = rd_MEMCPY_create_virtdevice, 740 .free_device = rd_free_device, 741 .alloc_task = rd_alloc_task, 742 .do_task = rd_MEMCPY_do_task, 743 .free_task = rd_free_task, 744 .check_configfs_dev_params = rd_check_configfs_dev_params, 745 .set_configfs_dev_params = rd_set_configfs_dev_params, 746 .show_configfs_dev_params = rd_show_configfs_dev_params, 747 .get_cdb = rd_get_cdb, 748 .get_device_rev = rd_get_device_rev, 749 .get_device_type = rd_get_device_type, 750 .get_blocks = rd_get_blocks, 751 }; 752 753 int __init rd_module_init(void) 754 { 755 int ret; 756 757 ret = transport_subsystem_register(&rd_mcp_template); 758 if (ret < 0) { 759 return ret; 760 } 761 762 return 0; 763 } 764 765 void rd_module_exit(void) 766 { 767 transport_subsystem_release(&rd_mcp_template); 768 } 769