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 | fd9a11d | 2012-11-09 14:51:48 -0800 | [diff] [blame] | 7 | * (c) Copyright 2003-2012 RisingTide Systems LLC. |
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> |
| 30 | #include <linux/blkdev.h> |
| 31 | #include <linux/slab.h> |
| 32 | #include <linux/spinlock.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 33 | #include <scsi/scsi.h> |
| 34 | #include <scsi/scsi_host.h> |
| 35 | |
| 36 | #include <target/target_core_base.h> |
Christoph Hellwig | c4795fb | 2011-11-16 09:46:48 -0500 | [diff] [blame] | 37 | #include <target/target_core_backend.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 38 | |
| 39 | #include "target_core_rd.h" |
| 40 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 41 | static inline struct rd_dev *RD_DEV(struct se_device *dev) |
| 42 | { |
| 43 | return container_of(dev, struct rd_dev, dev); |
| 44 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 45 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 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); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 55 | if (!rd_host) { |
| 56 | pr_err("Unable to allocate memory for struct rd_host\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 57 | return -ENOMEM; |
| 58 | } |
| 59 | |
| 60 | rd_host->rd_host_id = host_id; |
| 61 | |
Andy Grover | 5951146d | 2011-07-19 10:26:37 +0000 | [diff] [blame] | 62 | hba->hba_ptr = rd_host; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 63 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 64 | pr_debug("CORE_HBA[%d] - TCM Ramdisk HBA Driver %s on" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 65 | " Generic Target Core Stack %s\n", hba->hba_id, |
| 66 | RD_HBA_VERSION, TARGET_CORE_MOD_VERSION); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 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 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 75 | pr_debug("CORE_HBA[%d] - Detached Ramdisk HBA: %u from" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 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 | /* rd_release_device_space(): |
| 83 | * |
| 84 | * |
| 85 | */ |
| 86 | static void rd_release_device_space(struct rd_dev *rd_dev) |
| 87 | { |
| 88 | u32 i, j, page_count = 0, sg_per_table; |
| 89 | struct rd_dev_sg_table *sg_table; |
| 90 | struct page *pg; |
| 91 | struct scatterlist *sg; |
| 92 | |
| 93 | if (!rd_dev->sg_table_array || !rd_dev->sg_table_count) |
| 94 | return; |
| 95 | |
| 96 | sg_table = rd_dev->sg_table_array; |
| 97 | |
| 98 | for (i = 0; i < rd_dev->sg_table_count; i++) { |
| 99 | sg = sg_table[i].sg_table; |
| 100 | sg_per_table = sg_table[i].rd_sg_count; |
| 101 | |
| 102 | for (j = 0; j < sg_per_table; j++) { |
| 103 | pg = sg_page(&sg[j]); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 104 | if (pg) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 105 | __free_page(pg); |
| 106 | page_count++; |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | kfree(sg); |
| 111 | } |
| 112 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 113 | pr_debug("CORE_RD[%u] - Released device space for Ramdisk" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 114 | " Device ID: %u, pages %u in %u tables total bytes %lu\n", |
| 115 | rd_dev->rd_host->rd_host_id, rd_dev->rd_dev_id, page_count, |
| 116 | rd_dev->sg_table_count, (unsigned long)page_count * PAGE_SIZE); |
| 117 | |
| 118 | kfree(sg_table); |
| 119 | rd_dev->sg_table_array = NULL; |
| 120 | rd_dev->sg_table_count = 0; |
| 121 | } |
| 122 | |
| 123 | |
| 124 | /* rd_build_device_space(): |
| 125 | * |
| 126 | * |
| 127 | */ |
| 128 | static int rd_build_device_space(struct rd_dev *rd_dev) |
| 129 | { |
| 130 | u32 i = 0, j, page_offset = 0, sg_per_table, sg_tables, total_sg_needed; |
| 131 | u32 max_sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
| 132 | sizeof(struct scatterlist)); |
| 133 | struct rd_dev_sg_table *sg_table; |
| 134 | struct page *pg; |
| 135 | struct scatterlist *sg; |
| 136 | |
| 137 | if (rd_dev->rd_page_count <= 0) { |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 138 | pr_err("Illegal page count: %u for Ramdisk device\n", |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 139 | rd_dev->rd_page_count); |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 140 | return -EINVAL; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 141 | } |
| 142 | total_sg_needed = rd_dev->rd_page_count; |
| 143 | |
| 144 | sg_tables = (total_sg_needed / max_sg_per_table) + 1; |
| 145 | |
| 146 | sg_table = kzalloc(sg_tables * sizeof(struct rd_dev_sg_table), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 147 | if (!sg_table) { |
| 148 | pr_err("Unable to allocate memory for Ramdisk" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 149 | " scatterlist tables\n"); |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 150 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | rd_dev->sg_table_array = sg_table; |
| 154 | rd_dev->sg_table_count = sg_tables; |
| 155 | |
| 156 | while (total_sg_needed) { |
| 157 | sg_per_table = (total_sg_needed > max_sg_per_table) ? |
| 158 | max_sg_per_table : total_sg_needed; |
| 159 | |
| 160 | sg = kzalloc(sg_per_table * sizeof(struct scatterlist), |
| 161 | GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 162 | if (!sg) { |
| 163 | pr_err("Unable to allocate scatterlist array" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 164 | " for struct rd_dev\n"); |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 165 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 166 | } |
| 167 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 168 | sg_init_table(sg, sg_per_table); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 169 | |
| 170 | sg_table[i].sg_table = sg; |
| 171 | sg_table[i].rd_sg_count = sg_per_table; |
| 172 | sg_table[i].page_start_offset = page_offset; |
| 173 | sg_table[i++].page_end_offset = (page_offset + sg_per_table) |
| 174 | - 1; |
| 175 | |
| 176 | for (j = 0; j < sg_per_table; j++) { |
| 177 | pg = alloc_pages(GFP_KERNEL, 0); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 178 | if (!pg) { |
| 179 | pr_err("Unable to allocate scatterlist" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 180 | " pages for struct rd_dev_sg_table\n"); |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 181 | return -ENOMEM; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 182 | } |
| 183 | sg_assign_page(&sg[j], pg); |
| 184 | sg[j].length = PAGE_SIZE; |
| 185 | } |
| 186 | |
| 187 | page_offset += sg_per_table; |
| 188 | total_sg_needed -= sg_per_table; |
| 189 | } |
| 190 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 191 | pr_debug("CORE_RD[%u] - Built Ramdisk Device ID: %u space of" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 192 | " %u pages in %u tables\n", rd_dev->rd_host->rd_host_id, |
| 193 | rd_dev->rd_dev_id, rd_dev->rd_page_count, |
| 194 | rd_dev->sg_table_count); |
| 195 | |
| 196 | return 0; |
| 197 | } |
| 198 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 199 | 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] | 200 | { |
| 201 | struct rd_dev *rd_dev; |
| 202 | struct rd_host *rd_host = hba->hba_ptr; |
| 203 | |
| 204 | rd_dev = kzalloc(sizeof(struct rd_dev), GFP_KERNEL); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 205 | if (!rd_dev) { |
| 206 | pr_err("Unable to allocate memory for struct rd_dev\n"); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 207 | return NULL; |
| 208 | } |
| 209 | |
| 210 | rd_dev->rd_host = rd_host; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 211 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 212 | return &rd_dev->dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 213 | } |
| 214 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 215 | static int rd_configure_device(struct se_device *dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 216 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 217 | struct rd_dev *rd_dev = RD_DEV(dev); |
| 218 | struct rd_host *rd_host = dev->se_hba->hba_ptr; |
| 219 | int ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 220 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 221 | if (!(rd_dev->rd_flags & RDF_HAS_PAGE_COUNT)) { |
| 222 | pr_debug("Missing rd_pages= parameter\n"); |
| 223 | return -EINVAL; |
| 224 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 225 | |
Dan Carpenter | 065f971 | 2011-03-14 04:06:03 -0700 | [diff] [blame] | 226 | ret = rd_build_device_space(rd_dev); |
| 227 | if (ret < 0) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 228 | goto fail; |
| 229 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 230 | dev->dev_attrib.hw_block_size = RD_BLOCKSIZE; |
| 231 | dev->dev_attrib.hw_max_sectors = UINT_MAX; |
| 232 | dev->dev_attrib.hw_queue_depth = RD_MAX_DEVICE_QUEUE_DEPTH; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 233 | |
| 234 | rd_dev->rd_dev_id = rd_host->rd_host_dev_id_count++; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 235 | |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 236 | 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] | 237 | " %u pages in %u tables, %lu total bytes\n", |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 238 | 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] | 239 | rd_dev->sg_table_count, |
| 240 | (unsigned long)(rd_dev->rd_page_count * PAGE_SIZE)); |
| 241 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 242 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 243 | |
| 244 | fail: |
| 245 | rd_release_device_space(rd_dev); |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 246 | return ret; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 247 | } |
| 248 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 249 | static void rd_free_device(struct se_device *dev) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 250 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 251 | struct rd_dev *rd_dev = RD_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 252 | |
| 253 | rd_release_device_space(rd_dev); |
| 254 | kfree(rd_dev); |
| 255 | } |
| 256 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 257 | static struct rd_dev_sg_table *rd_get_sg_table(struct rd_dev *rd_dev, u32 page) |
| 258 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 259 | struct rd_dev_sg_table *sg_table; |
Martin Svec | 8f67835 | 2013-01-15 12:43:35 -0800 | [diff] [blame] | 260 | u32 i, sg_per_table = (RD_MAX_ALLOCATION_SIZE / |
| 261 | sizeof(struct scatterlist)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 262 | |
Martin Svec | 8f67835 | 2013-01-15 12:43:35 -0800 | [diff] [blame] | 263 | i = page / sg_per_table; |
| 264 | if (i < rd_dev->sg_table_count) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 265 | sg_table = &rd_dev->sg_table_array[i]; |
| 266 | if ((sg_table->page_start_offset <= page) && |
| 267 | (sg_table->page_end_offset >= page)) |
| 268 | return sg_table; |
| 269 | } |
| 270 | |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 271 | 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] | 272 | page); |
| 273 | |
| 274 | return NULL; |
| 275 | } |
| 276 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 277 | static sense_reason_t |
| 278 | rd_execute_rw(struct se_cmd *cmd) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 279 | { |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 280 | struct scatterlist *sgl = cmd->t_data_sg; |
| 281 | u32 sgl_nents = cmd->t_data_nents; |
| 282 | enum dma_data_direction data_direction = cmd->data_direction; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 283 | struct se_device *se_dev = cmd->se_dev; |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 284 | struct rd_dev *dev = RD_DEV(se_dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 285 | struct rd_dev_sg_table *table; |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 286 | struct scatterlist *rd_sg; |
| 287 | struct sg_mapping_iter m; |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 288 | u32 rd_offset; |
| 289 | u32 rd_size; |
| 290 | u32 rd_page; |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 291 | u32 src_len; |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 292 | u64 tmp; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 293 | |
Nicholas Bellinger | 52c0742 | 2013-05-11 16:16:49 -0700 | [diff] [blame^] | 294 | if (dev->rd_flags & RDF_NULLIO) { |
| 295 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
| 296 | return 0; |
| 297 | } |
| 298 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 299 | tmp = cmd->t_task_lba * se_dev->dev_attrib.block_size; |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 300 | rd_offset = do_div(tmp, PAGE_SIZE); |
| 301 | rd_page = tmp; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 302 | rd_size = cmd->data_length; |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 303 | |
| 304 | table = rd_get_sg_table(dev, rd_page); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 305 | if (!table) |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 306 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 307 | |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 308 | rd_sg = &table->sg_table[rd_page - table->page_start_offset]; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 309 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 310 | 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] | 311 | dev->rd_dev_id, |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 312 | data_direction == DMA_FROM_DEVICE ? "Read" : "Write", |
| 313 | cmd->t_task_lba, rd_size, rd_page, rd_offset); |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 314 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 315 | src_len = PAGE_SIZE - rd_offset; |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 316 | sg_miter_start(&m, sgl, sgl_nents, |
| 317 | data_direction == DMA_FROM_DEVICE ? |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 318 | SG_MITER_TO_SG : SG_MITER_FROM_SG); |
| 319 | while (rd_size) { |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 320 | u32 len; |
| 321 | void *rd_addr; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 322 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 323 | sg_miter_next(&m); |
Hannes Reinecke | bbf344e | 2013-02-06 14:42:28 +0100 | [diff] [blame] | 324 | if (!(u32)m.length) { |
| 325 | pr_debug("RD[%u]: invalid sgl %p len %zu\n", |
| 326 | dev->rd_dev_id, m.addr, m.length); |
| 327 | sg_miter_stop(&m); |
| 328 | return TCM_INCORRECT_AMOUNT_OF_DATA; |
| 329 | } |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 330 | len = min((u32)m.length, src_len); |
Hannes Reinecke | bbf344e | 2013-02-06 14:42:28 +0100 | [diff] [blame] | 331 | if (len > rd_size) { |
| 332 | pr_debug("RD[%u]: size underrun page %d offset %d " |
| 333 | "size %d\n", dev->rd_dev_id, |
| 334 | rd_page, rd_offset, rd_size); |
| 335 | len = rd_size; |
| 336 | } |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 337 | m.consumed = len; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 338 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 339 | rd_addr = sg_virt(rd_sg) + rd_offset; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 340 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 341 | if (data_direction == DMA_FROM_DEVICE) |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 342 | memcpy(m.addr, rd_addr, len); |
| 343 | else |
| 344 | memcpy(rd_addr, m.addr, len); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 345 | |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 346 | rd_size -= len; |
| 347 | if (!rd_size) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 348 | continue; |
| 349 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 350 | src_len -= len; |
| 351 | if (src_len) { |
| 352 | rd_offset += len; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 353 | continue; |
| 354 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 355 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 356 | /* rd page completed, next one please */ |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 357 | rd_page++; |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 358 | rd_offset = 0; |
| 359 | src_len = PAGE_SIZE; |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 360 | if (rd_page <= table->page_end_offset) { |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 361 | rd_sg++; |
| 362 | continue; |
| 363 | } |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 364 | |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 365 | table = rd_get_sg_table(dev, rd_page); |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 366 | if (!table) { |
| 367 | sg_miter_stop(&m); |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 368 | return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 369 | } |
| 370 | |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 371 | /* since we increment, the first sg entry is correct */ |
| 372 | rd_sg = table->sg_table; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 373 | } |
Sebastian Andrzej Siewior | 65b0c78 | 2011-11-30 10:48:30 +0100 | [diff] [blame] | 374 | sg_miter_stop(&m); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 375 | |
Christoph Hellwig | 5787cac | 2012-04-24 00:25:06 -0400 | [diff] [blame] | 376 | target_complete_cmd(cmd, SAM_STAT_GOOD); |
Nicholas Bellinger | 03e98c9 | 2011-11-04 02:36:16 -0700 | [diff] [blame] | 377 | return 0; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 378 | } |
| 379 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 380 | enum { |
Nicholas Bellinger | 52c0742 | 2013-05-11 16:16:49 -0700 | [diff] [blame^] | 381 | Opt_rd_pages, Opt_rd_nullio, Opt_err |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 382 | }; |
| 383 | |
| 384 | static match_table_t tokens = { |
| 385 | {Opt_rd_pages, "rd_pages=%d"}, |
Nicholas Bellinger | 52c0742 | 2013-05-11 16:16:49 -0700 | [diff] [blame^] | 386 | {Opt_rd_nullio, "rd_nullio=%d"}, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 387 | {Opt_err, NULL} |
| 388 | }; |
| 389 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 390 | static ssize_t rd_set_configfs_dev_params(struct se_device *dev, |
| 391 | const char *page, ssize_t count) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 392 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 393 | struct rd_dev *rd_dev = RD_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 394 | char *orig, *ptr, *opts; |
| 395 | substring_t args[MAX_OPT_ARGS]; |
| 396 | int ret = 0, arg, token; |
| 397 | |
| 398 | opts = kstrdup(page, GFP_KERNEL); |
| 399 | if (!opts) |
| 400 | return -ENOMEM; |
| 401 | |
| 402 | orig = opts; |
| 403 | |
Sebastian Andrzej Siewior | 90c161b | 2011-11-23 20:53:17 +0100 | [diff] [blame] | 404 | while ((ptr = strsep(&opts, ",\n")) != NULL) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 405 | if (!*ptr) |
| 406 | continue; |
| 407 | |
| 408 | token = match_token(ptr, tokens, args); |
| 409 | switch (token) { |
| 410 | case Opt_rd_pages: |
| 411 | match_int(args, &arg); |
| 412 | rd_dev->rd_page_count = arg; |
Andy Grover | 6708bb2 | 2011-06-08 10:36:43 -0700 | [diff] [blame] | 413 | pr_debug("RAMDISK: Referencing Page" |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 414 | " Count: %u\n", rd_dev->rd_page_count); |
| 415 | rd_dev->rd_flags |= RDF_HAS_PAGE_COUNT; |
| 416 | break; |
Nicholas Bellinger | 52c0742 | 2013-05-11 16:16:49 -0700 | [diff] [blame^] | 417 | case Opt_rd_nullio: |
| 418 | match_int(args, &arg); |
| 419 | if (arg != 1) |
| 420 | break; |
| 421 | |
| 422 | pr_debug("RAMDISK: Setting NULLIO flag: %d\n", arg); |
| 423 | rd_dev->rd_flags |= RDF_NULLIO; |
| 424 | break; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 425 | default: |
| 426 | break; |
| 427 | } |
| 428 | } |
| 429 | |
| 430 | kfree(orig); |
| 431 | return (!ret) ? count : ret; |
| 432 | } |
| 433 | |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 434 | 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] | 435 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 436 | struct rd_dev *rd_dev = RD_DEV(dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 437 | |
Christoph Hellwig | 8feb58d | 2012-03-26 04:56:41 -0400 | [diff] [blame] | 438 | ssize_t bl = sprintf(b, "TCM RamDisk ID: %u RamDisk Makeup: rd_mcp\n", |
| 439 | rd_dev->rd_dev_id); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 440 | bl += sprintf(b + bl, " PAGES/PAGE_SIZE: %u*%lu" |
Nicholas Bellinger | 52c0742 | 2013-05-11 16:16:49 -0700 | [diff] [blame^] | 441 | " SG_table_count: %u nullio: %d\n", rd_dev->rd_page_count, |
| 442 | PAGE_SIZE, rd_dev->sg_table_count, |
| 443 | !!(rd_dev->rd_flags & RDF_NULLIO)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 444 | return bl; |
| 445 | } |
| 446 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 447 | static sector_t rd_get_blocks(struct se_device *dev) |
| 448 | { |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 449 | struct rd_dev *rd_dev = RD_DEV(dev); |
| 450 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 451 | unsigned long long blocks_long = ((rd_dev->rd_page_count * PAGE_SIZE) / |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 452 | dev->dev_attrib.block_size) - 1; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 453 | |
| 454 | return blocks_long; |
| 455 | } |
| 456 | |
Christoph Hellwig | 9e999a6 | 2012-10-07 10:55:50 -0400 | [diff] [blame] | 457 | static struct sbc_ops rd_sbc_ops = { |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 458 | .execute_rw = rd_execute_rw, |
| 459 | }; |
| 460 | |
Christoph Hellwig | de103c9 | 2012-11-06 12:24:09 -0800 | [diff] [blame] | 461 | static sense_reason_t |
| 462 | rd_parse_cdb(struct se_cmd *cmd) |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 463 | { |
Christoph Hellwig | 9e999a6 | 2012-10-07 10:55:50 -0400 | [diff] [blame] | 464 | return sbc_parse_cdb(cmd, &rd_sbc_ops); |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 465 | } |
| 466 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 467 | static struct se_subsystem_api rd_mcp_template = { |
| 468 | .name = "rd_mcp", |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 469 | .inquiry_prod = "RAMDISK-MCP", |
| 470 | .inquiry_rev = RD_MCP_VERSION, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 471 | .transport_type = TRANSPORT_PLUGIN_VHBA_VDEV, |
| 472 | .attach_hba = rd_attach_hba, |
| 473 | .detach_hba = rd_detach_hba, |
Christoph Hellwig | 0fd97cc | 2012-10-08 00:03:19 -0400 | [diff] [blame] | 474 | .alloc_device = rd_alloc_device, |
| 475 | .configure_device = rd_configure_device, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 476 | .free_device = rd_free_device, |
Christoph Hellwig | 0c2ad7d | 2012-06-17 18:40:52 -0400 | [diff] [blame] | 477 | .parse_cdb = rd_parse_cdb, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 478 | .set_configfs_dev_params = rd_set_configfs_dev_params, |
| 479 | .show_configfs_dev_params = rd_show_configfs_dev_params, |
Christoph Hellwig | 6f23ac8 | 2012-10-07 10:55:53 -0400 | [diff] [blame] | 480 | .get_device_type = sbc_get_device_type, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 481 | .get_blocks = rd_get_blocks, |
| 482 | }; |
| 483 | |
| 484 | int __init rd_module_init(void) |
| 485 | { |
| 486 | int ret; |
| 487 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 488 | ret = transport_subsystem_register(&rd_mcp_template); |
| 489 | if (ret < 0) { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 490 | return ret; |
| 491 | } |
| 492 | |
| 493 | return 0; |
| 494 | } |
| 495 | |
| 496 | void rd_module_exit(void) |
| 497 | { |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 498 | transport_subsystem_release(&rd_mcp_template); |
| 499 | } |