Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * Filename: target_core_rd.c |
| 3 | * |
| 4 | * This file contains the Storage Engine <-> Ramdisk transport |
| 5 | * specific functions. |
| 6 | * |
Nicholas Bellinger | 4c76251 | 2013-09-05 15:29:12 -0700 | [diff] [blame] | 7 | * (c) Copyright 2003-2013 Datera, Inc. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 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 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 27 | #include <linux/string.h> |
| 28 | #include <linux/parser.h> |
| 29 | #include <linux/timer.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 30 | #include <linux/slab.h> |
| 31 | #include <linux/spinlock.h> |
Bart Van Assche | ba92999 | 2015-05-08 10:11:12 +0200 | [diff] [blame] | 32 | #include <scsi/scsi_proto.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 33 | |
| 34 | #include <target/target_core_base.h> |
Christoph Hellwig | c4795fb | 2011-11-16 09:46:48 -0500 | [diff] [blame] | 35 | #include <target/target_core_backend.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 36 | |
| 37 | #include "target_core_rd.h" |
| 38 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 39 | static inline struct rd_dev *RD_DEV(struct se_device *dev) |
| 40 | { |
| 41 | return container_of(dev, struct rd_dev, dev); |
| 42 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 43 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 44 | static int rd_attach_hba(struct se_hba *hba, u32 host_id) |
| 45 | { |
| 46 | struct rd_host *rd_host; |
| 47 | |
| 48 | rd_host = kzalloc(sizeof(struct rd_host), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 49 | if (!rd_host) { |
| 50 | pr_err("Unable to allocate memory for struct rd_host\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 51 | return -ENOMEM; |
| 52 | } |
| 53 | |
| 54 | rd_host->rd_host_id = host_id; |
| 55 | |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 56 | hba->hba_ptr = rd_host; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 57 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 58 | pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 59 | " Generic Target Core Stack %s\n", hba->hba_id, |
Christoph Hellwig | ce8dd25 | 2015-06-19 15:14:39 +0200 | [diff] [blame] | 60 | RD_HBA_VERSION, TARGET_CORE_VERSION); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 61 | |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | static void rd_detach_hba(struct se_hba *hba) |
| 66 | { |
| 67 | struct rd_host *rd_host = hba->hba_ptr; |
| 68 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 69 | pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 70 | " Generic Target Core\n", hba->hba_id, rd_host->rd_host_id); |
| 71 | |
| 72 | kfree(rd_host); |
| 73 | hba->hba_ptr = NULL; |
| 74 | } |
| 75 | |
Nicholas Bellinger | 4442dc8 | 2014-01-07 22:40:27 +0000 | [diff] [blame] | 76 | static u32 rd_release_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, |
| 77 | u32 sg_table_count) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 78 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 79 | struct page *pg; |
| 80 | struct scatterlist *sg; |
Nicholas Bellinger | 4442dc8 | 2014-01-07 22:40:27 +0000 | [diff] [blame] | 81 | u32 i, j, page_count = 0, sg_per_table; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 82 | |
Nicholas Bellinger | 4442dc8 | 2014-01-07 22:40:27 +0000 | [diff] [blame] | 83 | for (i = 0; i < sg_table_count; i++) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 84 | sg = sg_table[i].sg_table; |
| 85 | sg_per_table = sg_table[i].rd_sg_count; |
| 86 | |
| 87 | for (j = 0; j < sg_per_table; j++) { |
| 88 | pg = sg_page(&sg[j]); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 89 | if (pg) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 90 | __free_page(pg); |
| 91 | page_count++; |
| 92 | } |
| 93 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 94 | kfree(sg); |
| 95 | } |
| 96 | |
Nicholas Bellinger | 4442dc8 | 2014-01-07 22:40:27 +0000 | [diff] [blame] | 97 | kfree(sg_table); |
| 98 | return page_count; |
| 99 | } |
| 100 | |
| 101 | static void rd_release_device_space(struct rd_dev *rd_dev) |
| 102 | { |
| 103 | u32 page_count; |
| 104 | |
| 105 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) |
| 106 | return; |
| 107 | |
| 108 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_table_array, |
| 109 | rd_dev->sg_table_count); |
| 110 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 111 | pr_debug("CORE_RD[%u] - Released device space for Ramdisk" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 112 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", |
| 113 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, |
| 114 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); |
| 115 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 116 | rd_dev->sg_table_array = NULL; |
| 117 | rd_dev->sg_table_count = 0; |
| 118 | } |
| 119 | |
| 120 | |
| 121 | /* rd_build_device_space(): |
| 122 | * |
| 123 | * |
| 124 | */ |
Nicholas Bellinger | 4442dc8 | 2014-01-07 22:40:27 +0000 | [diff] [blame] | 125 | static int rd_allocate_sgl_table(struct rd_dev *rd_dev, struct rd_dev_sg_table *sg_table, |
| 126 | u32 total_sg_needed, unsigned char init_payload) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 127 | { |
Nicholas Bellinger | 4442dc8 | 2014-01-07 22:40:27 +0000 | [diff] [blame] | 128 | u32 i = 0, j, page_offset = 0, sg_per_table; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 129 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
| 130 | sizeof(struct scatterlist)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 131 | struct page *pg; |
| 132 | struct scatterlist *sg; |
Nicholas Bellinger | 4442dc8 | 2014-01-07 22:40:27 +0000 | [diff] [blame] | 133 | unsigned char *p; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 134 | |
| 135 | while (total_sg_needed) { |
Akinobu Mita | bfd9a53 | 2015-04-11 13:17:31 +0900 | [diff] [blame] | 136 | unsigned int chain_entry = 0; |
| 137 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 138 | sg_per_table = (total_sg_needed > max_sg_per_table) ? |
| 139 | max_sg_per_table : total_sg_needed; |
| 140 | |
Akinobu Mita | bfd9a53 | 2015-04-11 13:17:31 +0900 | [diff] [blame] | 141 | /* |
| 142 | * Reserve extra element for chain entry |
| 143 | */ |
| 144 | if (sg_per_table < total_sg_needed) |
| 145 | chain_entry = 1; |
| 146 | |
Akinobu Mita | bfd9a53 | 2015-04-11 13:17:31 +0900 | [diff] [blame] | 147 | sg = kcalloc(sg_per_table + chain_entry, sizeof(*sg), |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 148 | GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 149 | if (!sg) { |
| 150 | pr_err("Unable to allocate scatterlist array" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 151 | " for struct rd_dev\n"); |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 152 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 153 | } |
| 154 | |
Akinobu Mita | bfd9a53 | 2015-04-11 13:17:31 +0900 | [diff] [blame] | 155 | sg_init_table(sg, sg_per_table + chain_entry); |
| 156 | |
Akinobu Mita | bfd9a53 | 2015-04-11 13:17:31 +0900 | [diff] [blame] | 157 | if (i > 0) { |
| 158 | sg_chain(sg_table[i - 1].sg_table, |
| 159 | max_sg_per_table + 1, sg); |
| 160 | } |
| 161 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 162 | sg_table[i].sg_table = sg; |
| 163 | sg_table[i].rd_sg_count = sg_per_table; |
| 164 | sg_table[i].page_start_offset = page_offset; |
| 165 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) |
| 166 | - 1; |
| 167 | |
| 168 | for (j = 0; j < sg_per_table; j++) { |
| 169 | pg = alloc_pages(GFP_KERNEL, 0); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 170 | if (!pg) { |
| 171 | pr_err("Unable to allocate scatterlist" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 172 | " pages for struct rd_dev_sg_table\n"); |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 173 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 174 | } |
| 175 | sg_assign_page(&sg[j], pg); |
| 176 | sg[j].length = PAGE_SIZE; |
Nicholas Bellinger | 4442dc8 | 2014-01-07 22:40:27 +0000 | [diff] [blame] | 177 | |
| 178 | p = kmap(pg); |
| 179 | memset(p, init_payload, PAGE_SIZE); |
| 180 | kunmap(pg); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 181 | } |
| 182 | |
| 183 | page_offset += sg_per_table; |
| 184 | total_sg_needed -= sg_per_table; |
| 185 | } |
| 186 | |
Nicholas Bellinger | 4442dc8 | 2014-01-07 22:40:27 +0000 | [diff] [blame] | 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | static int rd_build_device_space(struct rd_dev *rd_dev) |
| 191 | { |
| 192 | struct rd_dev_sg_table *sg_table; |
| 193 | u32 sg_tables, total_sg_needed; |
| 194 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
| 195 | sizeof(struct scatterlist)); |
| 196 | int rc; |
| 197 | |
| 198 | if (rd_dev->rd_page_count <= 0) { |
| 199 | pr_err("Illegal page count: %u for Ramdisk device\n", |
| 200 | rd_dev->rd_page_count); |
| 201 | return -EINVAL; |
| 202 | } |
| 203 | |
| 204 | /* Don't need backing pages for NULLIO */ |
| 205 | if (rd_dev->rd_flags & RDF_NULLIO) |
| 206 | return 0; |
| 207 | |
| 208 | total_sg_needed = rd_dev->rd_page_count; |
| 209 | |
| 210 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; |
| 211 | |
| 212 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); |
| 213 | if (!sg_table) { |
| 214 | pr_err("Unable to allocate memory for Ramdisk" |
| 215 | " scatterlist tables\n"); |
| 216 | return -ENOMEM; |
| 217 | } |
| 218 | |
| 219 | rd_dev->sg_table_array = sg_table; |
| 220 | rd_dev->sg_table_count = sg_tables; |
| 221 | |
| 222 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0x00); |
| 223 | if (rc) |
| 224 | return rc; |
| 225 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 226 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
Nicholas Bellinger | 4442dc8 | 2014-01-07 22:40:27 +0000 | [diff] [blame] | 227 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
| 228 | rd_dev->rd_dev_id, rd_dev->rd_page_count, |
| 229 | rd_dev->sg_table_count); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 230 | |
| 231 | return 0; |
| 232 | } |
| 233 | |
Nicholas Bellinger | d7e8eb5 | 2014-01-07 23:24:14 +0000 | [diff] [blame] | 234 | static void rd_release_prot_space(struct rd_dev *rd_dev) |
| 235 | { |
| 236 | u32 page_count; |
| 237 | |
| 238 | if (!rd_dev->sg_prot_array || !rd_dev->sg_prot_count) |
| 239 | return; |
| 240 | |
| 241 | page_count = rd_release_sgl_table(rd_dev, rd_dev->sg_prot_array, |
| 242 | rd_dev->sg_prot_count); |
| 243 | |
| 244 | pr_debug("CORE_RD[%u] - Released protection space for Ramdisk" |
| 245 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", |
| 246 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, |
| 247 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); |
| 248 | |
| 249 | rd_dev->sg_prot_array = NULL; |
| 250 | rd_dev->sg_prot_count = 0; |
| 251 | } |
| 252 | |
Quinn Tran | 9d2e59f | 2014-03-28 19:05:27 -0400 | [diff] [blame] | 253 | static int rd_build_prot_space(struct rd_dev *rd_dev, int prot_length, int block_size) |
Nicholas Bellinger | d7e8eb5 | 2014-01-07 23:24:14 +0000 | [diff] [blame] | 254 | { |
| 255 | struct rd_dev_sg_table *sg_table; |
| 256 | u32 total_sg_needed, sg_tables; |
| 257 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
| 258 | sizeof(struct scatterlist)); |
| 259 | int rc; |
| 260 | |
| 261 | if (rd_dev->rd_flags & RDF_NULLIO) |
| 262 | return 0; |
Quinn Tran | 9d2e59f | 2014-03-28 19:05:27 -0400 | [diff] [blame] | 263 | /* |
| 264 | * prot_length=8byte dif data |
| 265 | * tot sg needed = rd_page_count * (PGSZ/block_size) * |
| 266 | * (prot_length/block_size) + pad |
| 267 | * PGSZ canceled each other. |
| 268 | */ |
| 269 | total_sg_needed = (rd_dev->rd_page_count * prot_length / block_size) + 1; |
Nicholas Bellinger | d7e8eb5 | 2014-01-07 23:24:14 +0000 | [diff] [blame] | 270 | |
| 271 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; |
| 272 | |
| 273 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); |
| 274 | if (!sg_table) { |
| 275 | pr_err("Unable to allocate memory for Ramdisk protection" |
| 276 | " scatterlist tables\n"); |
| 277 | return -ENOMEM; |
| 278 | } |
| 279 | |
| 280 | rd_dev->sg_prot_array = sg_table; |
| 281 | rd_dev->sg_prot_count = sg_tables; |
| 282 | |
| 283 | rc = rd_allocate_sgl_table(rd_dev, sg_table, total_sg_needed, 0xff); |
| 284 | if (rc) |
| 285 | return rc; |
| 286 | |
| 287 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u prot space of" |
| 288 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
| 289 | rd_dev->rd_dev_id, total_sg_needed, rd_dev->sg_prot_count); |
| 290 | |
| 291 | return 0; |
| 292 | } |
| 293 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 294 | static struct se_device *rd_alloc_device(struct se_hba *hba, const char *name) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 295 | { |
| 296 | struct rd_dev *rd_dev; |
| 297 | struct rd_host *rd_host = hba->hba_ptr; |
| 298 | |
| 299 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 300 | if (!rd_dev) { |
| 301 | pr_err("Unable to allocate memory for struct rd_dev\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 302 | return NULL; |
| 303 | } |
| 304 | |
| 305 | rd_dev->rd_host = rd_host; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 306 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 307 | return &rd_dev->dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 308 | } |
| 309 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 310 | static int rd_configure_device(struct se_device *dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 311 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 312 | struct rd_dev *rd_dev = RD_DEV(dev); |
| 313 | struct rd_host *rd_host = dev->se_hba->hba_ptr; |
| 314 | int ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 315 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 316 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { |
| 317 | pr_debug("Missing rd_pages= parameter\n"); |
| 318 | return -EINVAL; |
| 319 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 320 | |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 321 | ret = rd_build_device_space(rd_dev); |
| 322 | if (ret < 0) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 323 | goto fail; |
| 324 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 325 | dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; |
| 326 | dev->dev_attrib.hw_max_sectors = UINT_MAX; |
| 327 | dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; |
Sagi Grimberg | 5dacbfc | 2015-07-04 14:05:24 +0300 | [diff] [blame] | 328 | dev->dev_attrib.is_nonrot = 1; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 329 | |
| 330 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 331 | |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 332 | pr_debug("CORE_RD[%u] - Added TCM MEMCPY Ramdisk Device ID: %u of" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 333 | " %u pages in %u tables, %lu total bytes\n", |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 334 | rd_host->rd_host_id, rd_dev->rd_dev_id, rd_dev->rd_page_count, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 335 | rd_dev->sg_table_count, |
| 336 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); |
| 337 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 338 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 339 | |
| 340 | fail: |
| 341 | rd_release_device_space(rd_dev); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 342 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 343 | } |
| 344 | |
Nicholas Bellinger | 4cc987e | 2015-05-19 00:03:07 -0700 | [diff] [blame] | 345 | static void rd_dev_call_rcu(struct rcu_head *p) |
| 346 | { |
| 347 | struct se_device *dev = container_of(p, struct se_device, rcu_head); |
| 348 | struct rd_dev *rd_dev = RD_DEV(dev); |
| 349 | |
| 350 | kfree(rd_dev); |
| 351 | } |
| 352 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 353 | static void rd_free_device(struct se_device *dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 354 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 355 | struct rd_dev *rd_dev = RD_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 356 | |
| 357 | rd_release_device_space(rd_dev); |
Nicholas Bellinger | 4cc987e | 2015-05-19 00:03:07 -0700 | [diff] [blame] | 358 | call_rcu(&dev->rcu_head, rd_dev_call_rcu); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 359 | } |
| 360 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 361 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) |
| 362 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 363 | struct rd_dev_sg_table *sg_table; |
Martin Svec | 8f67835 | 2013-01-15 12:43:35 -0800 | [diff] [blame] | 364 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
| 365 | sizeof(struct scatterlist)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 366 | |
Martin Svec | 8f67835 | 2013-01-15 12:43:35 -0800 | [diff] [blame] | 367 | i = page / sg_per_table; |
| 368 | if (i < rd_dev->sg_table_count) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 369 | sg_table = &rd_dev->sg_table_array[i]; |
| 370 | if ((sg_table->page_start_offset <= page) && |
| 371 | (sg_table->page_end_offset >= page)) |
| 372 | return sg_table; |
| 373 | } |
| 374 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 375 | pr_err("Unable to locate struct rd_dev_sg_table for page: %u\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 376 | page); |
| 377 | |
| 378 | return NULL; |
| 379 | } |
| 380 | |
Nicholas Bellinger | 6e61111 | 2014-01-08 12:06:30 +0000 | [diff] [blame] | 381 | static struct rd_dev_sg_table *rd_get_prot_table(struct rd_dev *rd_dev, u32 page) |
| 382 | { |
| 383 | struct rd_dev_sg_table *sg_table; |
| 384 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
| 385 | sizeof(struct scatterlist)); |
| 386 | |
| 387 | i = page / sg_per_table; |
| 388 | if (i < rd_dev->sg_prot_count) { |
| 389 | sg_table = &rd_dev->sg_prot_array[i]; |
| 390 | if ((sg_table->page_start_offset <= page) && |
| 391 | (sg_table->page_end_offset >= page)) |
| 392 | return sg_table; |
| 393 | } |
| 394 | |
| 395 | pr_err("Unable to locate struct prot rd_dev_sg_table for page: %u\n", |
| 396 | page); |
| 397 | |
| 398 | return NULL; |
| 399 | } |
| 400 | |
Sagi Grimberg | f75b6fa | 2015-04-19 20:27:19 +0300 | [diff] [blame] | 401 | static sense_reason_t rd_do_prot_rw(struct se_cmd *cmd, bool is_read) |
Akinobu Mita | 6766cc8 | 2015-04-05 23:59:38 +0900 | [diff] [blame] | 402 | { |
| 403 | struct se_device *se_dev = cmd->se_dev; |
| 404 | struct rd_dev *dev = RD_DEV(se_dev); |
| 405 | struct rd_dev_sg_table *prot_table; |
| 406 | struct scatterlist *prot_sg; |
| 407 | u32 sectors = cmd->data_length / se_dev->dev_attrib.block_size; |
| 408 | u32 prot_offset, prot_page; |
Akinobu Mita | bfd9a53 | 2015-04-11 13:17:31 +0900 | [diff] [blame] | 409 | u32 prot_npages __maybe_unused; |
Akinobu Mita | 6766cc8 | 2015-04-05 23:59:38 +0900 | [diff] [blame] | 410 | u64 tmp; |
Akinobu Mita | bfd9a53 | 2015-04-11 13:17:31 +0900 | [diff] [blame] | 411 | sense_reason_t rc = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Akinobu Mita | 6766cc8 | 2015-04-05 23:59:38 +0900 | [diff] [blame] | 412 | |
| 413 | tmp = cmd->t_task_lba * se_dev->prot_length; |
| 414 | prot_offset = do_div(tmp, PAGE_SIZE); |
| 415 | prot_page = tmp; |
| 416 | |
| 417 | prot_table = rd_get_prot_table(dev, prot_page); |
| 418 | if (!prot_table) |
| 419 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 420 | |
| 421 | prot_sg = &prot_table->sg_table[prot_page - |
| 422 | prot_table->page_start_offset]; |
| 423 | |
Sagi Grimberg | f75b6fa | 2015-04-19 20:27:19 +0300 | [diff] [blame] | 424 | if (is_read) |
| 425 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, |
| 426 | prot_sg, prot_offset); |
| 427 | else |
| 428 | rc = sbc_dif_verify(cmd, cmd->t_task_lba, sectors, 0, |
| 429 | cmd->t_prot_sg, 0); |
| 430 | |
| 431 | if (!rc) |
| 432 | sbc_dif_copy_prot(cmd, sectors, is_read, prot_sg, prot_offset); |
| 433 | |
Akinobu Mita | 6766cc8 | 2015-04-05 23:59:38 +0900 | [diff] [blame] | 434 | return rc; |
| 435 | } |
| 436 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 437 | static sense_reason_t |
Nicholas Bellinger | a82a953 | 2013-08-19 23:57:30 -0700 | [diff] [blame] | 438 | rd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents, |
| 439 | enum dma_data_direction data_direction) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 440 | { |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 441 | struct se_device *se_dev = cmd->se_dev; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 442 | struct rd_dev *dev = RD_DEV(se_dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 443 | struct rd_dev_sg_table *table; |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 444 | struct scatterlist *rd_sg; |
| 445 | struct sg_mapping_iter m; |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 446 | u32 rd_offset; |
| 447 | u32 rd_size; |
| 448 | u32 rd_page; |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 449 | u32 src_len; |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 450 | u64 tmp; |
Nicholas Bellinger | 6e61111 | 2014-01-08 12:06:30 +0000 | [diff] [blame] | 451 | sense_reason_t rc; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 452 | |
Nicholas Bellinger | 52c0742 | 2013-05-11 16:16:49 -0700 | [diff] [blame] | 453 | if (dev->rd_flags & RDF_NULLIO) { |
| 454 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
| 455 | return 0; |
| 456 | } |
| 457 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 458 | tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 459 | rd_offset = do_div(tmp, PAGE_SIZE); |
| 460 | rd_page = tmp; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 461 | rd_size = cmd->data_length; |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 462 | |
| 463 | table = rd_get_sg_table(dev, rd_page); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 464 | if (!table) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 465 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 466 | |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 467 | rd_sg = &table->sg_table[rd_page - table->page_start_offset]; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 468 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 469 | pr_debug("RD[%u]: %s LBA: %llu, Size: %u Page: %u, Offset: %u\n", |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 470 | dev->rd_dev_id, |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 471 | data_direction == DMA_FROM_DEVICE ? "Read" : "Write", |
| 472 | cmd->t_task_lba, rd_size, rd_page, rd_offset); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 473 | |
Nicholas Bellinger | 1762742 | 2015-03-27 23:15:04 -0700 | [diff] [blame] | 474 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
| 475 | data_direction == DMA_TO_DEVICE) { |
Sagi Grimberg | f75b6fa | 2015-04-19 20:27:19 +0300 | [diff] [blame] | 476 | rc = rd_do_prot_rw(cmd, false); |
Nicholas Bellinger | 6e61111 | 2014-01-08 12:06:30 +0000 | [diff] [blame] | 477 | if (rc) |
| 478 | return rc; |
| 479 | } |
| 480 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 481 | src_len = PAGE_SIZE - rd_offset; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 482 | sg_miter_start(&m, sgl, sgl_nents, |
| 483 | data_direction == DMA_FROM_DEVICE ? |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 484 | SG_MITER_TO_SG : SG_MITER_FROM_SG); |
| 485 | while (rd_size) { |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 486 | u32 len; |
| 487 | void *rd_addr; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 488 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 489 | sg_miter_next(&m); |
Hannes Reinecke | bbf344e | 2013-02-06 14:42:28 +0100 | [diff] [blame] | 490 | if (!(u32)m.length) { |
| 491 | pr_debug("RD[%u]: invalid sgl %p len %zu\n", |
| 492 | dev->rd_dev_id, m.addr, m.length); |
| 493 | sg_miter_stop(&m); |
| 494 | return TCM_INCORRECT_AMOUNT_OF_DATA; |
| 495 | } |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 496 | len = min((u32)m.length, src_len); |
Hannes Reinecke | bbf344e | 2013-02-06 14:42:28 +0100 | [diff] [blame] | 497 | if (len > rd_size) { |
| 498 | pr_debug("RD[%u]: size underrun page %d offset %d " |
| 499 | "size %d\n", dev->rd_dev_id, |
| 500 | rd_page, rd_offset, rd_size); |
| 501 | len = rd_size; |
| 502 | } |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 503 | m.consumed = len; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 504 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 505 | rd_addr = sg_virt(rd_sg) + rd_offset; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 506 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 507 | if (data_direction == DMA_FROM_DEVICE) |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 508 | memcpy(m.addr, rd_addr, len); |
| 509 | else |
| 510 | memcpy(rd_addr, m.addr, len); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 511 | |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 512 | rd_size -= len; |
| 513 | if (!rd_size) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 514 | continue; |
| 515 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 516 | src_len -= len; |
| 517 | if (src_len) { |
| 518 | rd_offset += len; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 519 | continue; |
| 520 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 521 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 522 | /* rd page completed, next one please */ |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 523 | rd_page++; |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 524 | rd_offset = 0; |
| 525 | src_len = PAGE_SIZE; |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 526 | if (rd_page <= table->page_end_offset) { |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 527 | rd_sg++; |
| 528 | continue; |
| 529 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 530 | |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 531 | table = rd_get_sg_table(dev, rd_page); |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 532 | if (!table) { |
| 533 | sg_miter_stop(&m); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 534 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 535 | } |
| 536 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 537 | /* since we increment, the first sg entry is correct */ |
| 538 | rd_sg = table->sg_table; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 539 | } |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 540 | sg_miter_stop(&m); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 541 | |
Nicholas Bellinger | 1762742 | 2015-03-27 23:15:04 -0700 | [diff] [blame] | 542 | if (cmd->prot_type && se_dev->dev_attrib.pi_prot_type && |
| 543 | data_direction == DMA_FROM_DEVICE) { |
Sagi Grimberg | f75b6fa | 2015-04-19 20:27:19 +0300 | [diff] [blame] | 544 | rc = rd_do_prot_rw(cmd, true); |
Nicholas Bellinger | 6e61111 | 2014-01-08 12:06:30 +0000 | [diff] [blame] | 545 | if (rc) |
| 546 | return rc; |
| 547 | } |
| 548 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 549 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 550 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 551 | } |
| 552 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 553 | enum { |
Nicholas Bellinger | 52c0742 | 2013-05-11 16:16:49 -0700 | [diff] [blame] | 554 | Opt_rd_pages, Opt_rd_nullio, Opt_err |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 555 | }; |
| 556 | |
| 557 | static match_table_t tokens = { |
| 558 | {Opt_rd_pages, "rd_pages=%d"}, |
Nicholas Bellinger | 52c0742 | 2013-05-11 16:16:49 -0700 | [diff] [blame] | 559 | {Opt_rd_nullio, "rd_nullio=%d"}, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 560 | {Opt_err, NULL} |
| 561 | }; |
| 562 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 563 | static ssize_t rd_set_configfs_dev_params(struct se_device *dev, |
| 564 | const char *page, ssize_t count) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 565 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 566 | struct rd_dev *rd_dev = RD_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 567 | char *orig, *ptr, *opts; |
| 568 | substring_t args[MAX_OPT_ARGS]; |
| 569 | int ret = 0, arg, token; |
| 570 | |
| 571 | opts = kstrdup(page, GFP_KERNEL); |
| 572 | if (!opts) |
| 573 | return -ENOMEM; |
| 574 | |
| 575 | orig = opts; |
| 576 | |
Sebastian Andrzej Siewior | 90c161b | 2011-11-23 20:53:17 +0100 | [diff] [blame] | 577 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 578 | if (!*ptr) |
| 579 | continue; |
| 580 | |
| 581 | token = match_token(ptr, tokens, args); |
| 582 | switch (token) { |
| 583 | case Opt_rd_pages: |
| 584 | match_int(args, &arg); |
| 585 | rd_dev->rd_page_count = arg; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 586 | pr_debug("RAMDISK: Referencing Page" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 587 | " Count: %u\n", rd_dev->rd_page_count); |
| 588 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; |
| 589 | break; |
Nicholas Bellinger | 52c0742 | 2013-05-11 16:16:49 -0700 | [diff] [blame] | 590 | case Opt_rd_nullio: |
| 591 | match_int(args, &arg); |
| 592 | if (arg != 1) |
| 593 | break; |
| 594 | |
| 595 | pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); |
| 596 | rd_dev->rd_flags |= RDF_NULLIO; |
| 597 | break; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 598 | default: |
| 599 | break; |
| 600 | } |
| 601 | } |
| 602 | |
| 603 | kfree(orig); |
| 604 | return (!ret) ? count : ret; |
| 605 | } |
| 606 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 607 | static ssize_t rd_show_configfs_dev_params(struct se_device *dev, char *b) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 608 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 609 | struct rd_dev *rd_dev = RD_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 610 | |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 611 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", |
| 612 | rd_dev->rd_dev_id); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 613 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" |
Nicholas Bellinger | 52c0742 | 2013-05-11 16:16:49 -0700 | [diff] [blame] | 614 | " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, |
| 615 | PAGE_SIZE, rd_dev->sg_table_count, |
| 616 | !!(rd_dev->rd_flags & RDF_NULLIO)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 617 | return bl; |
| 618 | } |
| 619 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 620 | static sector_t rd_get_blocks(struct se_device *dev) |
| 621 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 622 | struct rd_dev *rd_dev = RD_DEV(dev); |
| 623 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 624 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 625 | dev->dev_attrib.block_size) - 1; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 626 | |
| 627 | return blocks_long; |
| 628 | } |
| 629 | |
Nicholas Bellinger | d7e8eb5 | 2014-01-07 23:24:14 +0000 | [diff] [blame] | 630 | static int rd_init_prot(struct se_device *dev) |
| 631 | { |
| 632 | struct rd_dev *rd_dev = RD_DEV(dev); |
| 633 | |
| 634 | if (!dev->dev_attrib.pi_prot_type) |
| 635 | return 0; |
| 636 | |
Quinn Tran | 9d2e59f | 2014-03-28 19:05:27 -0400 | [diff] [blame] | 637 | return rd_build_prot_space(rd_dev, dev->prot_length, |
| 638 | dev->dev_attrib.block_size); |
Nicholas Bellinger | d7e8eb5 | 2014-01-07 23:24:14 +0000 | [diff] [blame] | 639 | } |
| 640 | |
| 641 | static void rd_free_prot(struct se_device *dev) |
| 642 | { |
| 643 | struct rd_dev *rd_dev = RD_DEV(dev); |
| 644 | |
| 645 | rd_release_prot_space(rd_dev); |
| 646 | } |
| 647 | |
Christoph Hellwig | 9e999a6 | 2012-10-07 10:55:50 -0400 | [diff] [blame] | 648 | static struct sbc_ops rd_sbc_ops = { |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 649 | .execute_rw = rd_execute_rw, |
| 650 | }; |
| 651 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 652 | static sense_reason_t |
| 653 | rd_parse_cdb(struct se_cmd *cmd) |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 654 | { |
Christoph Hellwig | 9e999a6 | 2012-10-07 10:55:50 -0400 | [diff] [blame] | 655 | return sbc_parse_cdb(cmd, &rd_sbc_ops); |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 656 | } |
| 657 | |
Christoph Hellwig | 0a06d43 | 2015-05-10 18:14:56 +0200 | [diff] [blame] | 658 | static const struct target_backend_ops rd_mcp_ops = { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 659 | .name = "rd_mcp", |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 660 | .inquiry_prod = "RAMDISK-MCP", |
| 661 | .inquiry_rev = RD_MCP_VERSION, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 662 | .attach_hba = rd_attach_hba, |
| 663 | .detach_hba = rd_detach_hba, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 664 | .alloc_device = rd_alloc_device, |
| 665 | .configure_device = rd_configure_device, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 666 | .free_device = rd_free_device, |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 667 | .parse_cdb = rd_parse_cdb, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 668 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
| 669 | .show_configfs_dev_params = rd_show_configfs_dev_params, |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 670 | .get_device_type = sbc_get_device_type, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 671 | .get_blocks = rd_get_blocks, |
Nicholas Bellinger | d7e8eb5 | 2014-01-07 23:24:14 +0000 | [diff] [blame] | 672 | .init_prot = rd_init_prot, |
| 673 | .free_prot = rd_free_prot, |
Christoph Hellwig | 5873c4d | 2015-05-10 18:14:57 +0200 | [diff] [blame] | 674 | .tb_dev_attrib_attrs = sbc_attrib_attrs, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 675 | }; |
| 676 | |
| 677 | int __init rd_module_init(void) |
| 678 | { |
Christoph Hellwig | 0a06d43 | 2015-05-10 18:14:56 +0200 | [diff] [blame] | 679 | return transport_backend_register(&rd_mcp_ops); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 680 | } |
| 681 | |
| 682 | void rd_module_exit(void) |
| 683 | { |
Christoph Hellwig | 0a06d43 | 2015-05-10 18:14:56 +0200 | [diff] [blame] | 684 | target_backend_unregister(&rd_mcp_ops); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 685 | } |