drivers/target/target_core_rd.c

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