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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /*******************************************************************************
0003  * Filename:  target_core_rd.c
0004  *
0005  * This file contains the Storage Engine <-> Ramdisk transport
0006  * specific functions.
0007  *
0008  * (c) Copyright 2003-2013 Datera, Inc.
0009  *
0010  * Nicholas A. Bellinger <nab@kernel.org>
0011  *
0012  ******************************************************************************/
0013 
0014 #include <linux/string.h>
0015 #include <linux/parser.h>
0016 #include <linux/highmem.h>
0017 #include <linux/timer.h>
0018 #include <linux/scatterlist.h>
0019 #include <linux/slab.h>
0020 #include <linux/spinlock.h>
0021 #include <scsi/scsi_proto.h>
0022 
0023 #include <target/target_core_base.h>
0024 #include <target/target_core_backend.h>
0025 
0026 #include "target_core_rd.h"
0027 
0028 static inline struct rd_dev *RD_DEV(struct se_device *dev)
0029 {
0030     return container_of(dev, struct rd_dev, dev);
0031 }
0032 
0033 static int rd_attach_hba(struct se_hba *hba, u32 host_id)
0034 {
0035     struct rd_host *rd_host;
0036 
0037     rd_host = kzalloc(sizeof(*rd_host), GFP_KERNEL);
0038     if (!rd_host)
0039         return -ENOMEM;
0040 
0041     rd_host->rd_host_id = host_id;
0042 
0043     hba->hba_ptr = rd_host;
0044 
0045     pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on"
0046         " Generic Target Core Stack %s\n", hba->hba_id,
0047         RD_HBA_VERSION, TARGET_CORE_VERSION);
0048 
0049     return 0;
0050 }
0051 
0052 static void rd_detach_hba(struct se_hba *hba)
0053 {
0054     struct rd_host *rd_host = hba->hba_ptr;
0055 
0056     pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from"
0057         " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id);
0058 
0059     kfree(rd_host);
0060     hba->hba_ptr = NULL;
0061 }
0062 
0063 static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table,
0064                  u32 sg_table_count)
0065 {
0066     struct page *pg;
0067     struct scatterlist *sg;
0068     u32 i, j, page_count = 0, sg_per_table;
0069 
0070     for (i = 0; i < sg_table_count; i++) {
0071         sg = sg_table[i].sg_table;
0072         sg_per_table = sg_table[i].rd_sg_count;
0073 
0074         for (j = 0; j < sg_per_table; j++) {
0075             pg = sg_page(&sg[j]);
0076             if (pg) {
0077                 __free_page(pg);
0078                 page_count++;
0079             }
0080         }
0081         kfree(sg);
0082     }
0083 
0084     kfree(sg_table);
0085     return page_count;
0086 }
0087 
0088 static void rd_release_device_space(struct rd_dev *rd_dev)
0089 {
0090     u32 page_count;
0091 
0092     if (!rd_dev->sg_table_array || !rd_dev->sg_table_count)
0093         return;
0094 
0095     page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array,
0096                       rd_dev->sg_table_count);
0097 
0098     pr_debug("CORE_RD[%u] - Released device space for Ramdisk"
0099         " Device ID: %u, pages %u in %u tables total bytes %lu\n",
0100         rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
0101         rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);
0102 
0103     rd_dev->sg_table_array = NULL;
0104     rd_dev->sg_table_count = 0;
0105 }
0106 
0107 
0108 /*  rd_build_device_space():
0109  *
0110  *
0111  */
0112 static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table,
0113                  u32 total_sg_needed, unsigned char init_payload)
0114 {
0115     u32 i = 0, j, page_offset = 0, sg_per_table;
0116     u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
0117                 sizeof(struct scatterlist));
0118     struct page *pg;
0119     struct scatterlist *sg;
0120     unsigned char *p;
0121 
0122     while (total_sg_needed) {
0123         unsigned int chain_entry = 0;
0124 
0125         sg_per_table = (total_sg_needed > max_sg_per_table) ?
0126             max_sg_per_table : total_sg_needed;
0127 
0128         /*
0129          * Reserve extra element for chain entry
0130          */
0131         if (sg_per_table < total_sg_needed)
0132             chain_entry = 1;
0133 
0134         sg = kmalloc_array(sg_per_table + chain_entry, sizeof(*sg),
0135                 GFP_KERNEL);
0136         if (!sg)
0137             return -ENOMEM;
0138 
0139         sg_init_table(sg, sg_per_table + chain_entry);
0140 
0141         if (i > 0) {
0142             sg_chain(sg_table[i - 1].sg_table,
0143                  max_sg_per_table + 1, sg);
0144         }
0145 
0146         sg_table[i].sg_table = sg;
0147         sg_table[i].rd_sg_count = sg_per_table;
0148         sg_table[i].page_start_offset = page_offset;
0149         sg_table[i++].page_end_offset = (page_offset + sg_per_table)
0150                         - 1;
0151 
0152         for (j = 0; j < sg_per_table; j++) {
0153             pg = alloc_pages(GFP_KERNEL, 0);
0154             if (!pg) {
0155                 pr_err("Unable to allocate scatterlist"
0156                     " pages for struct rd_dev_sg_table\n");
0157                 return -ENOMEM;
0158             }
0159             sg_assign_page(&sg[j], pg);
0160             sg[j].length = PAGE_SIZE;
0161 
0162             p = kmap(pg);
0163             memset(p, init_payload, PAGE_SIZE);
0164             kunmap(pg);
0165         }
0166 
0167         page_offset += sg_per_table;
0168         total_sg_needed -= sg_per_table;
0169     }
0170 
0171     return 0;
0172 }
0173 
0174 static int rd_build_device_space(struct rd_dev *rd_dev)
0175 {
0176     struct rd_dev_sg_table *sg_table;
0177     u32 sg_tables, total_sg_needed;
0178     u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
0179                 sizeof(struct scatterlist));
0180     int rc;
0181 
0182     if (rd_dev->rd_page_count <= 0) {
0183         pr_err("Illegal page count: %u for Ramdisk device\n",
0184                rd_dev->rd_page_count);
0185         return -EINVAL;
0186     }
0187 
0188     /* Don't need backing pages for NULLIO */
0189     if (rd_dev->rd_flags & RDF_NULLIO)
0190         return 0;
0191 
0192     total_sg_needed = rd_dev->rd_page_count;
0193 
0194     sg_tables = (total_sg_needed / max_sg_per_table) + 1;
0195     sg_table = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL);
0196     if (!sg_table)
0197         return -ENOMEM;
0198 
0199     rd_dev->sg_table_array = sg_table;
0200     rd_dev->sg_table_count = sg_tables;
0201 
0202     rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00);
0203     if (rc)
0204         return rc;
0205 
0206     pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of"
0207          " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
0208          rd_dev->rd_dev_id, rd_dev->rd_page_count,
0209          rd_dev->sg_table_count);
0210 
0211     return 0;
0212 }
0213 
0214 static void rd_release_prot_space(struct rd_dev *rd_dev)
0215 {
0216     u32 page_count;
0217 
0218     if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count)
0219         return;
0220 
0221     page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array,
0222                       rd_dev->sg_prot_count);
0223 
0224     pr_debug("CORE_RD[%u] - Released protection space for Ramdisk"
0225          " Device ID: %u, pages %u in %u tables total bytes %lu\n",
0226          rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count,
0227          rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE);
0228 
0229     rd_dev->sg_prot_array = NULL;
0230     rd_dev->sg_prot_count = 0;
0231 }
0232 
0233 static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size)
0234 {
0235     struct rd_dev_sg_table *sg_table;
0236     u32 total_sg_needed, sg_tables;
0237     u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE /
0238                 sizeof(struct scatterlist));
0239     int rc;
0240 
0241     if (rd_dev->rd_flags & RDF_NULLIO)
0242         return 0;
0243     /*
0244      * prot_length=8byte dif data
0245      * tot sg needed = rd_page_count * (PGSZ/block_size) *
0246      *         (prot_length/block_size) + pad
0247      * PGSZ canceled each other.
0248      */
0249     total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1;
0250 
0251     sg_tables = (total_sg_needed / max_sg_per_table) + 1;
0252     sg_table = kcalloc(sg_tables, sizeof(*sg_table), GFP_KERNEL);
0253     if (!sg_table)
0254         return -ENOMEM;
0255 
0256     rd_dev->sg_prot_array = sg_table;
0257     rd_dev->sg_prot_count = sg_tables;
0258 
0259     rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff);
0260     if (rc)
0261         return rc;
0262 
0263     pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of"
0264          " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id,
0265          rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count);
0266 
0267     return 0;
0268 }
0269 
0270 static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name)
0271 {
0272     struct rd_dev *rd_dev;
0273     struct rd_host *rd_host = hba->hba_ptr;
0274 
0275     rd_dev = kzalloc(sizeof(*rd_dev), GFP_KERNEL);
0276     if (!rd_dev)
0277         return NULL;
0278 
0279     rd_dev->rd_host = rd_host;
0280 
0281     return &rd_dev->dev;
0282 }
0283 
0284 static int rd_configure_device(struct se_device *dev)
0285 {
0286     struct rd_dev *rd_dev = RD_DEV(dev);
0287     struct rd_host *rd_host = dev->se_hba->hba_ptr;
0288     int ret;
0289 
0290     if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) {
0291         pr_debug("Missing rd_pages= parameter\n");
0292         return -EINVAL;
0293     }
0294 
0295     ret = rd_build_device_space(rd_dev);
0296     if (ret < 0)
0297         goto fail;
0298 
0299     dev->dev_attrib.hw_block_size = RD_BLOCKSIZE;
0300     dev->dev_attrib.hw_max_sectors = UINT_MAX;
0301     dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH;
0302     dev->dev_attrib.is_nonrot = 1;
0303 
0304     rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++;
0305 
0306     pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of"
0307         " %u pages in %u tables, %lu total bytes\n",
0308         rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count,
0309         rd_dev->sg_table_count,
0310         (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE));
0311 
0312     return 0;
0313 
0314 fail:
0315     rd_release_device_space(rd_dev);
0316     return ret;
0317 }
0318 
0319 static void rd_dev_call_rcu(struct rcu_head *p)
0320 {
0321     struct se_device *dev = container_of(p, struct se_device, rcu_head);
0322     struct rd_dev *rd_dev = RD_DEV(dev);
0323 
0324     kfree(rd_dev);
0325 }
0326 
0327 static void rd_free_device(struct se_device *dev)
0328 {
0329     call_rcu(&dev->rcu_head, rd_dev_call_rcu);
0330 }
0331 
0332 static void rd_destroy_device(struct se_device *dev)
0333 {
0334     struct rd_dev *rd_dev = RD_DEV(dev);
0335 
0336     rd_release_device_space(rd_dev);
0337 }
0338 
0339 static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page)
0340 {
0341     struct rd_dev_sg_table *sg_table;
0342     u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE /
0343                 sizeof(struct scatterlist));
0344 
0345     i = page / sg_per_table;
0346     if (i < rd_dev->sg_table_count) {
0347         sg_table = &rd_dev->sg_table_array[i];
0348         if ((sg_table->page_start_offset <= page) &&
0349             (sg_table->page_end_offset >= page))
0350             return sg_table;
0351     }
0352 
0353     pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n",
0354             page);
0355 
0356     return NULL;
0357 }
0358 
0359 static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page)
0360 {
0361     struct rd_dev_sg_table *sg_table;
0362     u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE /
0363                 sizeof(struct scatterlist));
0364 
0365     i = page / sg_per_table;
0366     if (i < rd_dev->sg_prot_count) {
0367         sg_table = &rd_dev->sg_prot_array[i];
0368         if ((sg_table->page_start_offset <= page) &&
0369              (sg_table->page_end_offset >= page))
0370             return sg_table;
0371     }
0372 
0373     pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n",
0374             page);
0375 
0376     return NULL;
0377 }
0378 
0379 static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read)
0380 {
0381     struct se_device *se_dev = cmd->se_dev;
0382     struct rd_dev *dev = RD_DEV(se_dev);
0383     struct rd_dev_sg_table *prot_table;
0384     struct scatterlist *prot_sg;
0385     u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size;
0386     u32 prot_offset, prot_page;
0387     u32 prot_npages __maybe_unused;
0388     u64 tmp;
0389     sense_reason_t rc = 0;
0390 
0391     tmp = cmd->t_task_lba * se_dev->prot_length;
0392     prot_offset = do_div(tmp, PAGE_SIZE);
0393     prot_page = tmp;
0394 
0395     prot_table = rd_get_prot_table(dev, prot_page);
0396     if (!prot_table)
0397         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
0398 
0399     prot_sg = &prot_table->sg_table[prot_page -
0400                     prot_table->page_start_offset];
0401 
0402     if (se_dev->dev_attrib.pi_prot_verify) {
0403         if (is_read)
0404             rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
0405                         prot_sg, prot_offset);
0406         else
0407             rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0,
0408                         cmd->t_prot_sg, 0);
0409     }
0410     if (!rc)
0411         sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset);
0412 
0413     return rc;
0414 }
0415 
0416 static sense_reason_t
0417 rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
0418           enum dma_data_direction data_direction)
0419 {
0420     struct se_device *se_dev = cmd->se_dev;
0421     struct rd_dev *dev = RD_DEV(se_dev);
0422     struct rd_dev_sg_table *table;
0423     struct scatterlist *rd_sg;
0424     struct sg_mapping_iter m;
0425     u32 rd_offset;
0426     u32 rd_size;
0427     u32 rd_page;
0428     u32 src_len;
0429     u64 tmp;
0430     sense_reason_t rc;
0431 
0432     if (dev->rd_flags & RDF_NULLIO) {
0433         target_complete_cmd(cmd, SAM_STAT_GOOD);
0434         return 0;
0435     }
0436 
0437     tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size;
0438     rd_offset = do_div(tmp, PAGE_SIZE);
0439     rd_page = tmp;
0440     rd_size = cmd->data_length;
0441 
0442     table = rd_get_sg_table(dev, rd_page);
0443     if (!table)
0444         return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
0445 
0446     rd_sg = &table->sg_table[rd_page - table->page_start_offset];
0447 
0448     pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n",
0449             dev->rd_dev_id,
0450             data_direction == DMA_FROM_DEVICE ? "Read" : "Write",
0451             cmd->t_task_lba, rd_size, rd_page, rd_offset);
0452 
0453     if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type &&
0454         data_direction == DMA_TO_DEVICE) {
0455         rc = rd_do_prot_rw(cmd, false);
0456         if (rc)
0457             return rc;
0458     }
0459 
0460     src_len = PAGE_SIZE - rd_offset;
0461     sg_miter_start(&m, sgl, sgl_nents,
0462             data_direction == DMA_FROM_DEVICE ?
0463                 SG_MITER_TO_SG : SG_MITER_FROM_SG);
0464     while (rd_size) {
0465         u32 len;
0466         void *rd_addr;
0467 
0468         sg_miter_next(&m);
0469         if (!(u32)m.length) {
0470             pr_debug("RD[%u]: invalid sgl %p len %zu\n",
0471                  dev->rd_dev_id, m.addr, m.length);
0472             sg_miter_stop(&m);
0473             return TCM_INCORRECT_AMOUNT_OF_DATA;
0474         }
0475         len = min((u32)m.length, src_len);
0476         if (len > rd_size) {
0477             pr_debug("RD[%u]: size underrun page %d offset %d "
0478                  "size %d\n", dev->rd_dev_id,
0479                  rd_page, rd_offset, rd_size);
0480             len = rd_size;
0481         }
0482         m.consumed = len;
0483 
0484         rd_addr = sg_virt(rd_sg) + rd_offset;
0485 
0486         if (data_direction == DMA_FROM_DEVICE)
0487             memcpy(m.addr, rd_addr, len);
0488         else
0489             memcpy(rd_addr, m.addr, len);
0490 
0491         rd_size -= len;
0492         if (!rd_size)
0493             continue;
0494 
0495         src_len -= len;
0496         if (src_len) {
0497             rd_offset += len;
0498             continue;
0499         }
0500 
0501         /* rd page completed, next one please */
0502         rd_page++;
0503         rd_offset = 0;
0504         src_len = PAGE_SIZE;
0505         if (rd_page <= table->page_end_offset) {
0506             rd_sg++;
0507             continue;
0508         }
0509 
0510         table = rd_get_sg_table(dev, rd_page);
0511         if (!table) {
0512             sg_miter_stop(&m);
0513             return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
0514         }
0515 
0516         /* since we increment, the first sg entry is correct */
0517         rd_sg = table->sg_table;
0518     }
0519     sg_miter_stop(&m);
0520 
0521     if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type &&
0522         data_direction == DMA_FROM_DEVICE) {
0523         rc = rd_do_prot_rw(cmd, true);
0524         if (rc)
0525             return rc;
0526     }
0527 
0528     target_complete_cmd(cmd, SAM_STAT_GOOD);
0529     return 0;
0530 }
0531 
0532 enum {
0533     Opt_rd_pages, Opt_rd_nullio, Opt_rd_dummy, Opt_err
0534 };
0535 
0536 static match_table_t tokens = {
0537     {Opt_rd_pages, "rd_pages=%d"},
0538     {Opt_rd_nullio, "rd_nullio=%d"},
0539     {Opt_rd_dummy, "rd_dummy=%d"},
0540     {Opt_err, NULL}
0541 };
0542 
0543 static ssize_t rd_set_configfs_dev_params(struct se_device *dev,
0544         const char *page, ssize_t count)
0545 {
0546     struct rd_dev *rd_dev = RD_DEV(dev);
0547     char *orig, *ptr, *opts;
0548     substring_t args[MAX_OPT_ARGS];
0549     int arg, token;
0550 
0551     opts = kstrdup(page, GFP_KERNEL);
0552     if (!opts)
0553         return -ENOMEM;
0554 
0555     orig = opts;
0556 
0557     while ((ptr = strsep(&opts, ",\n")) != NULL) {
0558         if (!*ptr)
0559             continue;
0560 
0561         token = match_token(ptr, tokens, args);
0562         switch (token) {
0563         case Opt_rd_pages:
0564             match_int(args, &arg);
0565             rd_dev->rd_page_count = arg;
0566             pr_debug("RAMDISK: Referencing Page"
0567                 " Count: %u\n", rd_dev->rd_page_count);
0568             rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT;
0569             break;
0570         case Opt_rd_nullio:
0571             match_int(args, &arg);
0572             if (arg != 1)
0573                 break;
0574 
0575             pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg);
0576             rd_dev->rd_flags |= RDF_NULLIO;
0577             break;
0578         case Opt_rd_dummy:
0579             match_int(args, &arg);
0580             if (arg != 1)
0581                 break;
0582 
0583             pr_debug("RAMDISK: Setting DUMMY flag: %d\n", arg);
0584             rd_dev->rd_flags |= RDF_DUMMY;
0585             break;
0586         default:
0587             break;
0588         }
0589     }
0590 
0591     kfree(orig);
0592     return count;
0593 }
0594 
0595 static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b)
0596 {
0597     struct rd_dev *rd_dev = RD_DEV(dev);
0598 
0599     ssize_t bl = sprintf(b, "TCM RamDisk ID: %u  RamDisk Makeup: rd_mcp\n",
0600             rd_dev->rd_dev_id);
0601     bl += sprintf(b + bl, "        PAGES/PAGE_SIZE: %u*%lu"
0602             "  SG_table_count: %u  nullio: %d dummy: %d\n",
0603             rd_dev->rd_page_count,
0604             PAGE_SIZE, rd_dev->sg_table_count,
0605             !!(rd_dev->rd_flags & RDF_NULLIO),
0606             !!(rd_dev->rd_flags & RDF_DUMMY));
0607     return bl;
0608 }
0609 
0610 static u32 rd_get_device_type(struct se_device *dev)
0611 {
0612     if (RD_DEV(dev)->rd_flags & RDF_DUMMY)
0613         return 0x3f; /* Unknown device type, not connected */
0614     else
0615         return sbc_get_device_type(dev);
0616 }
0617 
0618 static sector_t rd_get_blocks(struct se_device *dev)
0619 {
0620     struct rd_dev *rd_dev = RD_DEV(dev);
0621 
0622     unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) /
0623             dev->dev_attrib.block_size) - 1;
0624 
0625     return blocks_long;
0626 }
0627 
0628 static int rd_init_prot(struct se_device *dev)
0629 {
0630     struct rd_dev *rd_dev = RD_DEV(dev);
0631 
0632         if (!dev->dev_attrib.pi_prot_type)
0633         return 0;
0634 
0635     return rd_build_prot_space(rd_dev, dev->prot_length,
0636                    dev->dev_attrib.block_size);
0637 }
0638 
0639 static void rd_free_prot(struct se_device *dev)
0640 {
0641     struct rd_dev *rd_dev = RD_DEV(dev);
0642 
0643     rd_release_prot_space(rd_dev);
0644 }
0645 
0646 static struct sbc_ops rd_sbc_ops = {
0647     .execute_rw     = rd_execute_rw,
0648 };
0649 
0650 static sense_reason_t
0651 rd_parse_cdb(struct se_cmd *cmd)
0652 {
0653     return sbc_parse_cdb(cmd, &rd_sbc_ops);
0654 }
0655 
0656 static const struct target_backend_ops rd_mcp_ops = {
0657     .name           = "rd_mcp",
0658     .inquiry_prod       = "RAMDISK-MCP",
0659     .inquiry_rev        = RD_MCP_VERSION,
0660     .attach_hba     = rd_attach_hba,
0661     .detach_hba     = rd_detach_hba,
0662     .alloc_device       = rd_alloc_device,
0663     .configure_device   = rd_configure_device,
0664     .destroy_device     = rd_destroy_device,
0665     .free_device        = rd_free_device,
0666     .parse_cdb      = rd_parse_cdb,
0667     .set_configfs_dev_params = rd_set_configfs_dev_params,
0668     .show_configfs_dev_params = rd_show_configfs_dev_params,
0669     .get_device_type    = rd_get_device_type,
0670     .get_blocks     = rd_get_blocks,
0671     .init_prot      = rd_init_prot,
0672     .free_prot      = rd_free_prot,
0673     .tb_dev_attrib_attrs    = sbc_attrib_attrs,
0674 };
0675 
0676 int __init rd_module_init(void)
0677 {
0678     return transport_backend_register(&rd_mcp_ops);
0679 }
0680 
0681 void rd_module_exit(void)
0682 {
0683     target_backend_unregister(&rd_mcp_ops);
0684 }
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