Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * Filename: target_core_transport.c |
| 3 | * |
| 4 | * This file contains the Generic Target Engine Core. |
| 5 | * |
| 6 | * Copyright (c) 2002, 2003, 2004, 2005 PyX Technologies, Inc. |
| 7 | * Copyright (c) 2005, 2006, 2007 SBE, Inc. |
| 8 | * Copyright (c) 2007-2010 Rising Tide Systems |
| 9 | * Copyright (c) 2008-2010 Linux-iSCSI.org |
| 10 | * |
| 11 | * Nicholas A. Bellinger <nab@kernel.org> |
| 12 | * |
| 13 | * This program is free software; you can redistribute it and/or modify |
| 14 | * it under the terms of the GNU General Public License as published by |
| 15 | * the Free Software Foundation; either version 2 of the License, or |
| 16 | * (at your option) any later version. |
| 17 | * |
| 18 | * This program is distributed in the hope that it will be useful, |
| 19 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 20 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 21 | * GNU General Public License for more details. |
| 22 | * |
| 23 | * You should have received a copy of the GNU General Public License |
| 24 | * along with this program; if not, write to the Free Software |
| 25 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 26 | * |
| 27 | ******************************************************************************/ |
| 28 | |
| 29 | #include <linux/version.h> |
| 30 | #include <linux/net.h> |
| 31 | #include <linux/delay.h> |
| 32 | #include <linux/string.h> |
| 33 | #include <linux/timer.h> |
| 34 | #include <linux/slab.h> |
| 35 | #include <linux/blkdev.h> |
| 36 | #include <linux/spinlock.h> |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 37 | #include <linux/kthread.h> |
| 38 | #include <linux/in.h> |
| 39 | #include <linux/cdrom.h> |
| 40 | #include <asm/unaligned.h> |
| 41 | #include <net/sock.h> |
| 42 | #include <net/tcp.h> |
| 43 | #include <scsi/scsi.h> |
| 44 | #include <scsi/scsi_cmnd.h> |
| 45 | #include <scsi/libsas.h> /* For TASK_ATTR_* */ |
| 46 | |
| 47 | #include <target/target_core_base.h> |
| 48 | #include <target/target_core_device.h> |
| 49 | #include <target/target_core_tmr.h> |
| 50 | #include <target/target_core_tpg.h> |
| 51 | #include <target/target_core_transport.h> |
| 52 | #include <target/target_core_fabric_ops.h> |
| 53 | #include <target/target_core_configfs.h> |
| 54 | |
| 55 | #include "target_core_alua.h" |
| 56 | #include "target_core_hba.h" |
| 57 | #include "target_core_pr.h" |
| 58 | #include "target_core_scdb.h" |
| 59 | #include "target_core_ua.h" |
| 60 | |
| 61 | /* #define DEBUG_CDB_HANDLER */ |
| 62 | #ifdef DEBUG_CDB_HANDLER |
| 63 | #define DEBUG_CDB_H(x...) printk(KERN_INFO x) |
| 64 | #else |
| 65 | #define DEBUG_CDB_H(x...) |
| 66 | #endif |
| 67 | |
| 68 | /* #define DEBUG_CMD_MAP */ |
| 69 | #ifdef DEBUG_CMD_MAP |
| 70 | #define DEBUG_CMD_M(x...) printk(KERN_INFO x) |
| 71 | #else |
| 72 | #define DEBUG_CMD_M(x...) |
| 73 | #endif |
| 74 | |
| 75 | /* #define DEBUG_MEM_ALLOC */ |
| 76 | #ifdef DEBUG_MEM_ALLOC |
| 77 | #define DEBUG_MEM(x...) printk(KERN_INFO x) |
| 78 | #else |
| 79 | #define DEBUG_MEM(x...) |
| 80 | #endif |
| 81 | |
| 82 | /* #define DEBUG_MEM2_ALLOC */ |
| 83 | #ifdef DEBUG_MEM2_ALLOC |
| 84 | #define DEBUG_MEM2(x...) printk(KERN_INFO x) |
| 85 | #else |
| 86 | #define DEBUG_MEM2(x...) |
| 87 | #endif |
| 88 | |
| 89 | /* #define DEBUG_SG_CALC */ |
| 90 | #ifdef DEBUG_SG_CALC |
| 91 | #define DEBUG_SC(x...) printk(KERN_INFO x) |
| 92 | #else |
| 93 | #define DEBUG_SC(x...) |
| 94 | #endif |
| 95 | |
| 96 | /* #define DEBUG_SE_OBJ */ |
| 97 | #ifdef DEBUG_SE_OBJ |
| 98 | #define DEBUG_SO(x...) printk(KERN_INFO x) |
| 99 | #else |
| 100 | #define DEBUG_SO(x...) |
| 101 | #endif |
| 102 | |
| 103 | /* #define DEBUG_CMD_VOL */ |
| 104 | #ifdef DEBUG_CMD_VOL |
| 105 | #define DEBUG_VOL(x...) printk(KERN_INFO x) |
| 106 | #else |
| 107 | #define DEBUG_VOL(x...) |
| 108 | #endif |
| 109 | |
| 110 | /* #define DEBUG_CMD_STOP */ |
| 111 | #ifdef DEBUG_CMD_STOP |
| 112 | #define DEBUG_CS(x...) printk(KERN_INFO x) |
| 113 | #else |
| 114 | #define DEBUG_CS(x...) |
| 115 | #endif |
| 116 | |
| 117 | /* #define DEBUG_PASSTHROUGH */ |
| 118 | #ifdef DEBUG_PASSTHROUGH |
| 119 | #define DEBUG_PT(x...) printk(KERN_INFO x) |
| 120 | #else |
| 121 | #define DEBUG_PT(x...) |
| 122 | #endif |
| 123 | |
| 124 | /* #define DEBUG_TASK_STOP */ |
| 125 | #ifdef DEBUG_TASK_STOP |
| 126 | #define DEBUG_TS(x...) printk(KERN_INFO x) |
| 127 | #else |
| 128 | #define DEBUG_TS(x...) |
| 129 | #endif |
| 130 | |
| 131 | /* #define DEBUG_TRANSPORT_STOP */ |
| 132 | #ifdef DEBUG_TRANSPORT_STOP |
| 133 | #define DEBUG_TRANSPORT_S(x...) printk(KERN_INFO x) |
| 134 | #else |
| 135 | #define DEBUG_TRANSPORT_S(x...) |
| 136 | #endif |
| 137 | |
| 138 | /* #define DEBUG_TASK_FAILURE */ |
| 139 | #ifdef DEBUG_TASK_FAILURE |
| 140 | #define DEBUG_TF(x...) printk(KERN_INFO x) |
| 141 | #else |
| 142 | #define DEBUG_TF(x...) |
| 143 | #endif |
| 144 | |
| 145 | /* #define DEBUG_DEV_OFFLINE */ |
| 146 | #ifdef DEBUG_DEV_OFFLINE |
| 147 | #define DEBUG_DO(x...) printk(KERN_INFO x) |
| 148 | #else |
| 149 | #define DEBUG_DO(x...) |
| 150 | #endif |
| 151 | |
| 152 | /* #define DEBUG_TASK_STATE */ |
| 153 | #ifdef DEBUG_TASK_STATE |
| 154 | #define DEBUG_TSTATE(x...) printk(KERN_INFO x) |
| 155 | #else |
| 156 | #define DEBUG_TSTATE(x...) |
| 157 | #endif |
| 158 | |
| 159 | /* #define DEBUG_STATUS_THR */ |
| 160 | #ifdef DEBUG_STATUS_THR |
| 161 | #define DEBUG_ST(x...) printk(KERN_INFO x) |
| 162 | #else |
| 163 | #define DEBUG_ST(x...) |
| 164 | #endif |
| 165 | |
| 166 | /* #define DEBUG_TASK_TIMEOUT */ |
| 167 | #ifdef DEBUG_TASK_TIMEOUT |
| 168 | #define DEBUG_TT(x...) printk(KERN_INFO x) |
| 169 | #else |
| 170 | #define DEBUG_TT(x...) |
| 171 | #endif |
| 172 | |
| 173 | /* #define DEBUG_GENERIC_REQUEST_FAILURE */ |
| 174 | #ifdef DEBUG_GENERIC_REQUEST_FAILURE |
| 175 | #define DEBUG_GRF(x...) printk(KERN_INFO x) |
| 176 | #else |
| 177 | #define DEBUG_GRF(x...) |
| 178 | #endif |
| 179 | |
| 180 | /* #define DEBUG_SAM_TASK_ATTRS */ |
| 181 | #ifdef DEBUG_SAM_TASK_ATTRS |
| 182 | #define DEBUG_STA(x...) printk(KERN_INFO x) |
| 183 | #else |
| 184 | #define DEBUG_STA(x...) |
| 185 | #endif |
| 186 | |
| 187 | struct se_global *se_global; |
| 188 | |
| 189 | static struct kmem_cache *se_cmd_cache; |
| 190 | static struct kmem_cache *se_sess_cache; |
| 191 | struct kmem_cache *se_tmr_req_cache; |
| 192 | struct kmem_cache *se_ua_cache; |
| 193 | struct kmem_cache *se_mem_cache; |
| 194 | struct kmem_cache *t10_pr_reg_cache; |
| 195 | struct kmem_cache *t10_alua_lu_gp_cache; |
| 196 | struct kmem_cache *t10_alua_lu_gp_mem_cache; |
| 197 | struct kmem_cache *t10_alua_tg_pt_gp_cache; |
| 198 | struct kmem_cache *t10_alua_tg_pt_gp_mem_cache; |
| 199 | |
| 200 | /* Used for transport_dev_get_map_*() */ |
| 201 | typedef int (*map_func_t)(struct se_task *, u32); |
| 202 | |
| 203 | static int transport_generic_write_pending(struct se_cmd *); |
| 204 | static int transport_processing_thread(void *); |
| 205 | static int __transport_execute_tasks(struct se_device *dev); |
| 206 | static void transport_complete_task_attr(struct se_cmd *cmd); |
| 207 | static void transport_direct_request_timeout(struct se_cmd *cmd); |
| 208 | static void transport_free_dev_tasks(struct se_cmd *cmd); |
| 209 | static u32 transport_generic_get_cdb_count(struct se_cmd *cmd, |
| 210 | unsigned long long starting_lba, u32 sectors, |
| 211 | enum dma_data_direction data_direction, |
| 212 | struct list_head *mem_list, int set_counts); |
| 213 | static int transport_generic_get_mem(struct se_cmd *cmd, u32 length, |
| 214 | u32 dma_size); |
| 215 | static int transport_generic_remove(struct se_cmd *cmd, |
| 216 | int release_to_pool, int session_reinstatement); |
| 217 | static int transport_get_sectors(struct se_cmd *cmd); |
| 218 | static struct list_head *transport_init_se_mem_list(void); |
| 219 | static int transport_map_sg_to_mem(struct se_cmd *cmd, |
| 220 | struct list_head *se_mem_list, void *in_mem, |
| 221 | u32 *se_mem_cnt); |
| 222 | static void transport_memcpy_se_mem_read_contig(struct se_cmd *cmd, |
| 223 | unsigned char *dst, struct list_head *se_mem_list); |
| 224 | static void transport_release_fe_cmd(struct se_cmd *cmd); |
| 225 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd, |
| 226 | struct se_queue_obj *qobj); |
| 227 | static int transport_set_sense_codes(struct se_cmd *cmd, u8 asc, u8 ascq); |
| 228 | static void transport_stop_all_task_timers(struct se_cmd *cmd); |
| 229 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 230 | int init_se_global(void) |
| 231 | { |
| 232 | struct se_global *global; |
| 233 | |
| 234 | global = kzalloc(sizeof(struct se_global), GFP_KERNEL); |
| 235 | if (!(global)) { |
| 236 | printk(KERN_ERR "Unable to allocate memory for struct se_global\n"); |
| 237 | return -1; |
| 238 | } |
| 239 | |
| 240 | INIT_LIST_HEAD(&global->g_lu_gps_list); |
| 241 | INIT_LIST_HEAD(&global->g_se_tpg_list); |
| 242 | INIT_LIST_HEAD(&global->g_hba_list); |
| 243 | INIT_LIST_HEAD(&global->g_se_dev_list); |
| 244 | spin_lock_init(&global->g_device_lock); |
| 245 | spin_lock_init(&global->hba_lock); |
| 246 | spin_lock_init(&global->se_tpg_lock); |
| 247 | spin_lock_init(&global->lu_gps_lock); |
| 248 | spin_lock_init(&global->plugin_class_lock); |
| 249 | |
| 250 | se_cmd_cache = kmem_cache_create("se_cmd_cache", |
| 251 | sizeof(struct se_cmd), __alignof__(struct se_cmd), 0, NULL); |
| 252 | if (!(se_cmd_cache)) { |
| 253 | printk(KERN_ERR "kmem_cache_create for struct se_cmd failed\n"); |
| 254 | goto out; |
| 255 | } |
| 256 | se_tmr_req_cache = kmem_cache_create("se_tmr_cache", |
| 257 | sizeof(struct se_tmr_req), __alignof__(struct se_tmr_req), |
| 258 | 0, NULL); |
| 259 | if (!(se_tmr_req_cache)) { |
| 260 | printk(KERN_ERR "kmem_cache_create() for struct se_tmr_req" |
| 261 | " failed\n"); |
| 262 | goto out; |
| 263 | } |
| 264 | se_sess_cache = kmem_cache_create("se_sess_cache", |
| 265 | sizeof(struct se_session), __alignof__(struct se_session), |
| 266 | 0, NULL); |
| 267 | if (!(se_sess_cache)) { |
| 268 | printk(KERN_ERR "kmem_cache_create() for struct se_session" |
| 269 | " failed\n"); |
| 270 | goto out; |
| 271 | } |
| 272 | se_ua_cache = kmem_cache_create("se_ua_cache", |
| 273 | sizeof(struct se_ua), __alignof__(struct se_ua), |
| 274 | 0, NULL); |
| 275 | if (!(se_ua_cache)) { |
| 276 | printk(KERN_ERR "kmem_cache_create() for struct se_ua failed\n"); |
| 277 | goto out; |
| 278 | } |
| 279 | se_mem_cache = kmem_cache_create("se_mem_cache", |
| 280 | sizeof(struct se_mem), __alignof__(struct se_mem), 0, NULL); |
| 281 | if (!(se_mem_cache)) { |
| 282 | printk(KERN_ERR "kmem_cache_create() for struct se_mem failed\n"); |
| 283 | goto out; |
| 284 | } |
| 285 | t10_pr_reg_cache = kmem_cache_create("t10_pr_reg_cache", |
| 286 | sizeof(struct t10_pr_registration), |
| 287 | __alignof__(struct t10_pr_registration), 0, NULL); |
| 288 | if (!(t10_pr_reg_cache)) { |
| 289 | printk(KERN_ERR "kmem_cache_create() for struct t10_pr_registration" |
| 290 | " failed\n"); |
| 291 | goto out; |
| 292 | } |
| 293 | t10_alua_lu_gp_cache = kmem_cache_create("t10_alua_lu_gp_cache", |
| 294 | sizeof(struct t10_alua_lu_gp), __alignof__(struct t10_alua_lu_gp), |
| 295 | 0, NULL); |
| 296 | if (!(t10_alua_lu_gp_cache)) { |
| 297 | printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_cache" |
| 298 | " failed\n"); |
| 299 | goto out; |
| 300 | } |
| 301 | t10_alua_lu_gp_mem_cache = kmem_cache_create("t10_alua_lu_gp_mem_cache", |
| 302 | sizeof(struct t10_alua_lu_gp_member), |
| 303 | __alignof__(struct t10_alua_lu_gp_member), 0, NULL); |
| 304 | if (!(t10_alua_lu_gp_mem_cache)) { |
| 305 | printk(KERN_ERR "kmem_cache_create() for t10_alua_lu_gp_mem_" |
| 306 | "cache failed\n"); |
| 307 | goto out; |
| 308 | } |
| 309 | t10_alua_tg_pt_gp_cache = kmem_cache_create("t10_alua_tg_pt_gp_cache", |
| 310 | sizeof(struct t10_alua_tg_pt_gp), |
| 311 | __alignof__(struct t10_alua_tg_pt_gp), 0, NULL); |
| 312 | if (!(t10_alua_tg_pt_gp_cache)) { |
| 313 | printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_" |
| 314 | "cache failed\n"); |
| 315 | goto out; |
| 316 | } |
| 317 | t10_alua_tg_pt_gp_mem_cache = kmem_cache_create( |
| 318 | "t10_alua_tg_pt_gp_mem_cache", |
| 319 | sizeof(struct t10_alua_tg_pt_gp_member), |
| 320 | __alignof__(struct t10_alua_tg_pt_gp_member), |
| 321 | 0, NULL); |
| 322 | if (!(t10_alua_tg_pt_gp_mem_cache)) { |
| 323 | printk(KERN_ERR "kmem_cache_create() for t10_alua_tg_pt_gp_" |
| 324 | "mem_t failed\n"); |
| 325 | goto out; |
| 326 | } |
| 327 | |
| 328 | se_global = global; |
| 329 | |
| 330 | return 0; |
| 331 | out: |
| 332 | if (se_cmd_cache) |
| 333 | kmem_cache_destroy(se_cmd_cache); |
| 334 | if (se_tmr_req_cache) |
| 335 | kmem_cache_destroy(se_tmr_req_cache); |
| 336 | if (se_sess_cache) |
| 337 | kmem_cache_destroy(se_sess_cache); |
| 338 | if (se_ua_cache) |
| 339 | kmem_cache_destroy(se_ua_cache); |
| 340 | if (se_mem_cache) |
| 341 | kmem_cache_destroy(se_mem_cache); |
| 342 | if (t10_pr_reg_cache) |
| 343 | kmem_cache_destroy(t10_pr_reg_cache); |
| 344 | if (t10_alua_lu_gp_cache) |
| 345 | kmem_cache_destroy(t10_alua_lu_gp_cache); |
| 346 | if (t10_alua_lu_gp_mem_cache) |
| 347 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); |
| 348 | if (t10_alua_tg_pt_gp_cache) |
| 349 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); |
| 350 | if (t10_alua_tg_pt_gp_mem_cache) |
| 351 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); |
| 352 | kfree(global); |
| 353 | return -1; |
| 354 | } |
| 355 | |
| 356 | void release_se_global(void) |
| 357 | { |
| 358 | struct se_global *global; |
| 359 | |
| 360 | global = se_global; |
| 361 | if (!(global)) |
| 362 | return; |
| 363 | |
| 364 | kmem_cache_destroy(se_cmd_cache); |
| 365 | kmem_cache_destroy(se_tmr_req_cache); |
| 366 | kmem_cache_destroy(se_sess_cache); |
| 367 | kmem_cache_destroy(se_ua_cache); |
| 368 | kmem_cache_destroy(se_mem_cache); |
| 369 | kmem_cache_destroy(t10_pr_reg_cache); |
| 370 | kmem_cache_destroy(t10_alua_lu_gp_cache); |
| 371 | kmem_cache_destroy(t10_alua_lu_gp_mem_cache); |
| 372 | kmem_cache_destroy(t10_alua_tg_pt_gp_cache); |
| 373 | kmem_cache_destroy(t10_alua_tg_pt_gp_mem_cache); |
| 374 | kfree(global); |
| 375 | |
| 376 | se_global = NULL; |
| 377 | } |
| 378 | |
Nicholas Bellinger | e89d15e | 2011-02-09 15:35:03 -0800 | [diff] [blame] | 379 | /* SCSI statistics table index */ |
| 380 | static struct scsi_index_table scsi_index_table; |
| 381 | |
| 382 | /* |
| 383 | * Initialize the index table for allocating unique row indexes to various mib |
| 384 | * tables. |
| 385 | */ |
| 386 | void init_scsi_index_table(void) |
| 387 | { |
| 388 | memset(&scsi_index_table, 0, sizeof(struct scsi_index_table)); |
| 389 | spin_lock_init(&scsi_index_table.lock); |
| 390 | } |
| 391 | |
| 392 | /* |
| 393 | * Allocate a new row index for the entry type specified |
| 394 | */ |
| 395 | u32 scsi_get_new_index(scsi_index_t type) |
| 396 | { |
| 397 | u32 new_index; |
| 398 | |
| 399 | if ((type < 0) || (type >= SCSI_INDEX_TYPE_MAX)) { |
| 400 | printk(KERN_ERR "Invalid index type %d\n", type); |
| 401 | return -EINVAL; |
| 402 | } |
| 403 | |
| 404 | spin_lock(&scsi_index_table.lock); |
| 405 | new_index = ++scsi_index_table.scsi_mib_index[type]; |
| 406 | if (new_index == 0) |
| 407 | new_index = ++scsi_index_table.scsi_mib_index[type]; |
| 408 | spin_unlock(&scsi_index_table.lock); |
| 409 | |
| 410 | return new_index; |
| 411 | } |
| 412 | |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 413 | void transport_init_queue_obj(struct se_queue_obj *qobj) |
| 414 | { |
| 415 | atomic_set(&qobj->queue_cnt, 0); |
| 416 | INIT_LIST_HEAD(&qobj->qobj_list); |
| 417 | init_waitqueue_head(&qobj->thread_wq); |
| 418 | spin_lock_init(&qobj->cmd_queue_lock); |
| 419 | } |
| 420 | EXPORT_SYMBOL(transport_init_queue_obj); |
| 421 | |
| 422 | static int transport_subsystem_reqmods(void) |
| 423 | { |
| 424 | int ret; |
| 425 | |
| 426 | ret = request_module("target_core_iblock"); |
| 427 | if (ret != 0) |
| 428 | printk(KERN_ERR "Unable to load target_core_iblock\n"); |
| 429 | |
| 430 | ret = request_module("target_core_file"); |
| 431 | if (ret != 0) |
| 432 | printk(KERN_ERR "Unable to load target_core_file\n"); |
| 433 | |
| 434 | ret = request_module("target_core_pscsi"); |
| 435 | if (ret != 0) |
| 436 | printk(KERN_ERR "Unable to load target_core_pscsi\n"); |
| 437 | |
| 438 | ret = request_module("target_core_stgt"); |
| 439 | if (ret != 0) |
| 440 | printk(KERN_ERR "Unable to load target_core_stgt\n"); |
| 441 | |
| 442 | return 0; |
| 443 | } |
| 444 | |
| 445 | int transport_subsystem_check_init(void) |
| 446 | { |
| 447 | if (se_global->g_sub_api_initialized) |
| 448 | return 0; |
| 449 | /* |
| 450 | * Request the loading of known TCM subsystem plugins.. |
| 451 | */ |
| 452 | if (transport_subsystem_reqmods() < 0) |
| 453 | return -1; |
| 454 | |
| 455 | se_global->g_sub_api_initialized = 1; |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | struct se_session *transport_init_session(void) |
| 460 | { |
| 461 | struct se_session *se_sess; |
| 462 | |
| 463 | se_sess = kmem_cache_zalloc(se_sess_cache, GFP_KERNEL); |
| 464 | if (!(se_sess)) { |
| 465 | printk(KERN_ERR "Unable to allocate struct se_session from" |
| 466 | " se_sess_cache\n"); |
| 467 | return ERR_PTR(-ENOMEM); |
| 468 | } |
| 469 | INIT_LIST_HEAD(&se_sess->sess_list); |
| 470 | INIT_LIST_HEAD(&se_sess->sess_acl_list); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 471 | |
| 472 | return se_sess; |
| 473 | } |
| 474 | EXPORT_SYMBOL(transport_init_session); |
| 475 | |
| 476 | /* |
| 477 | * Called with spin_lock_bh(&struct se_portal_group->session_lock called. |
| 478 | */ |
| 479 | void __transport_register_session( |
| 480 | struct se_portal_group *se_tpg, |
| 481 | struct se_node_acl *se_nacl, |
| 482 | struct se_session *se_sess, |
| 483 | void *fabric_sess_ptr) |
| 484 | { |
| 485 | unsigned char buf[PR_REG_ISID_LEN]; |
| 486 | |
| 487 | se_sess->se_tpg = se_tpg; |
| 488 | se_sess->fabric_sess_ptr = fabric_sess_ptr; |
| 489 | /* |
| 490 | * Used by struct se_node_acl's under ConfigFS to locate active se_session-t |
| 491 | * |
| 492 | * Only set for struct se_session's that will actually be moving I/O. |
| 493 | * eg: *NOT* discovery sessions. |
| 494 | */ |
| 495 | if (se_nacl) { |
| 496 | /* |
| 497 | * If the fabric module supports an ISID based TransportID, |
| 498 | * save this value in binary from the fabric I_T Nexus now. |
| 499 | */ |
| 500 | if (TPG_TFO(se_tpg)->sess_get_initiator_sid != NULL) { |
| 501 | memset(&buf[0], 0, PR_REG_ISID_LEN); |
| 502 | TPG_TFO(se_tpg)->sess_get_initiator_sid(se_sess, |
| 503 | &buf[0], PR_REG_ISID_LEN); |
| 504 | se_sess->sess_bin_isid = get_unaligned_be64(&buf[0]); |
| 505 | } |
| 506 | spin_lock_irq(&se_nacl->nacl_sess_lock); |
| 507 | /* |
| 508 | * The se_nacl->nacl_sess pointer will be set to the |
| 509 | * last active I_T Nexus for each struct se_node_acl. |
| 510 | */ |
| 511 | se_nacl->nacl_sess = se_sess; |
| 512 | |
| 513 | list_add_tail(&se_sess->sess_acl_list, |
| 514 | &se_nacl->acl_sess_list); |
| 515 | spin_unlock_irq(&se_nacl->nacl_sess_lock); |
| 516 | } |
| 517 | list_add_tail(&se_sess->sess_list, &se_tpg->tpg_sess_list); |
| 518 | |
| 519 | printk(KERN_INFO "TARGET_CORE[%s]: Registered fabric_sess_ptr: %p\n", |
| 520 | TPG_TFO(se_tpg)->get_fabric_name(), se_sess->fabric_sess_ptr); |
| 521 | } |
| 522 | EXPORT_SYMBOL(__transport_register_session); |
| 523 | |
| 524 | void transport_register_session( |
| 525 | struct se_portal_group *se_tpg, |
| 526 | struct se_node_acl *se_nacl, |
| 527 | struct se_session *se_sess, |
| 528 | void *fabric_sess_ptr) |
| 529 | { |
| 530 | spin_lock_bh(&se_tpg->session_lock); |
| 531 | __transport_register_session(se_tpg, se_nacl, se_sess, fabric_sess_ptr); |
| 532 | spin_unlock_bh(&se_tpg->session_lock); |
| 533 | } |
| 534 | EXPORT_SYMBOL(transport_register_session); |
| 535 | |
| 536 | void transport_deregister_session_configfs(struct se_session *se_sess) |
| 537 | { |
| 538 | struct se_node_acl *se_nacl; |
| 539 | |
| 540 | /* |
| 541 | * Used by struct se_node_acl's under ConfigFS to locate active struct se_session |
| 542 | */ |
| 543 | se_nacl = se_sess->se_node_acl; |
| 544 | if ((se_nacl)) { |
| 545 | spin_lock_irq(&se_nacl->nacl_sess_lock); |
| 546 | list_del(&se_sess->sess_acl_list); |
| 547 | /* |
| 548 | * If the session list is empty, then clear the pointer. |
| 549 | * Otherwise, set the struct se_session pointer from the tail |
| 550 | * element of the per struct se_node_acl active session list. |
| 551 | */ |
| 552 | if (list_empty(&se_nacl->acl_sess_list)) |
| 553 | se_nacl->nacl_sess = NULL; |
| 554 | else { |
| 555 | se_nacl->nacl_sess = container_of( |
| 556 | se_nacl->acl_sess_list.prev, |
| 557 | struct se_session, sess_acl_list); |
| 558 | } |
| 559 | spin_unlock_irq(&se_nacl->nacl_sess_lock); |
| 560 | } |
| 561 | } |
| 562 | EXPORT_SYMBOL(transport_deregister_session_configfs); |
| 563 | |
| 564 | void transport_free_session(struct se_session *se_sess) |
| 565 | { |
| 566 | kmem_cache_free(se_sess_cache, se_sess); |
| 567 | } |
| 568 | EXPORT_SYMBOL(transport_free_session); |
| 569 | |
| 570 | void transport_deregister_session(struct se_session *se_sess) |
| 571 | { |
| 572 | struct se_portal_group *se_tpg = se_sess->se_tpg; |
| 573 | struct se_node_acl *se_nacl; |
| 574 | |
| 575 | if (!(se_tpg)) { |
| 576 | transport_free_session(se_sess); |
| 577 | return; |
| 578 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 579 | |
| 580 | spin_lock_bh(&se_tpg->session_lock); |
| 581 | list_del(&se_sess->sess_list); |
| 582 | se_sess->se_tpg = NULL; |
| 583 | se_sess->fabric_sess_ptr = NULL; |
| 584 | spin_unlock_bh(&se_tpg->session_lock); |
| 585 | |
| 586 | /* |
| 587 | * Determine if we need to do extra work for this initiator node's |
| 588 | * struct se_node_acl if it had been previously dynamically generated. |
| 589 | */ |
| 590 | se_nacl = se_sess->se_node_acl; |
| 591 | if ((se_nacl)) { |
| 592 | spin_lock_bh(&se_tpg->acl_node_lock); |
| 593 | if (se_nacl->dynamic_node_acl) { |
| 594 | if (!(TPG_TFO(se_tpg)->tpg_check_demo_mode_cache( |
| 595 | se_tpg))) { |
| 596 | list_del(&se_nacl->acl_list); |
| 597 | se_tpg->num_node_acls--; |
| 598 | spin_unlock_bh(&se_tpg->acl_node_lock); |
| 599 | |
| 600 | core_tpg_wait_for_nacl_pr_ref(se_nacl); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 601 | core_free_device_list_for_node(se_nacl, se_tpg); |
| 602 | TPG_TFO(se_tpg)->tpg_release_fabric_acl(se_tpg, |
| 603 | se_nacl); |
| 604 | spin_lock_bh(&se_tpg->acl_node_lock); |
| 605 | } |
| 606 | } |
| 607 | spin_unlock_bh(&se_tpg->acl_node_lock); |
| 608 | } |
| 609 | |
| 610 | transport_free_session(se_sess); |
| 611 | |
| 612 | printk(KERN_INFO "TARGET_CORE[%s]: Deregistered fabric_sess\n", |
| 613 | TPG_TFO(se_tpg)->get_fabric_name()); |
| 614 | } |
| 615 | EXPORT_SYMBOL(transport_deregister_session); |
| 616 | |
| 617 | /* |
| 618 | * Called with T_TASK(cmd)->t_state_lock held. |
| 619 | */ |
| 620 | static void transport_all_task_dev_remove_state(struct se_cmd *cmd) |
| 621 | { |
| 622 | struct se_device *dev; |
| 623 | struct se_task *task; |
| 624 | unsigned long flags; |
| 625 | |
| 626 | if (!T_TASK(cmd)) |
| 627 | return; |
| 628 | |
| 629 | list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) { |
| 630 | dev = task->se_dev; |
| 631 | if (!(dev)) |
| 632 | continue; |
| 633 | |
| 634 | if (atomic_read(&task->task_active)) |
| 635 | continue; |
| 636 | |
| 637 | if (!(atomic_read(&task->task_state_active))) |
| 638 | continue; |
| 639 | |
| 640 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
| 641 | list_del(&task->t_state_list); |
| 642 | DEBUG_TSTATE("Removed ITT: 0x%08x dev: %p task[%p]\n", |
| 643 | CMD_TFO(cmd)->tfo_get_task_tag(cmd), dev, task); |
| 644 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
| 645 | |
| 646 | atomic_set(&task->task_state_active, 0); |
| 647 | atomic_dec(&T_TASK(cmd)->t_task_cdbs_ex_left); |
| 648 | } |
| 649 | } |
| 650 | |
| 651 | /* transport_cmd_check_stop(): |
| 652 | * |
| 653 | * 'transport_off = 1' determines if t_transport_active should be cleared. |
| 654 | * 'transport_off = 2' determines if task_dev_state should be removed. |
| 655 | * |
| 656 | * A non-zero u8 t_state sets cmd->t_state. |
| 657 | * Returns 1 when command is stopped, else 0. |
| 658 | */ |
| 659 | static int transport_cmd_check_stop( |
| 660 | struct se_cmd *cmd, |
| 661 | int transport_off, |
| 662 | u8 t_state) |
| 663 | { |
| 664 | unsigned long flags; |
| 665 | |
| 666 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 667 | /* |
| 668 | * Determine if IOCTL context caller in requesting the stopping of this |
| 669 | * command for LUN shutdown purposes. |
| 670 | */ |
| 671 | if (atomic_read(&T_TASK(cmd)->transport_lun_stop)) { |
| 672 | DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->transport_lun_stop)" |
| 673 | " == TRUE for ITT: 0x%08x\n", __func__, __LINE__, |
| 674 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 675 | |
| 676 | cmd->deferred_t_state = cmd->t_state; |
| 677 | cmd->t_state = TRANSPORT_DEFERRED_CMD; |
| 678 | atomic_set(&T_TASK(cmd)->t_transport_active, 0); |
| 679 | if (transport_off == 2) |
| 680 | transport_all_task_dev_remove_state(cmd); |
| 681 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 682 | |
| 683 | complete(&T_TASK(cmd)->transport_lun_stop_comp); |
| 684 | return 1; |
| 685 | } |
| 686 | /* |
| 687 | * Determine if frontend context caller is requesting the stopping of |
| 688 | * this command for frontend excpections. |
| 689 | */ |
| 690 | if (atomic_read(&T_TASK(cmd)->t_transport_stop)) { |
| 691 | DEBUG_CS("%s:%d atomic_read(&T_TASK(cmd)->t_transport_stop) ==" |
| 692 | " TRUE for ITT: 0x%08x\n", __func__, __LINE__, |
| 693 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 694 | |
| 695 | cmd->deferred_t_state = cmd->t_state; |
| 696 | cmd->t_state = TRANSPORT_DEFERRED_CMD; |
| 697 | if (transport_off == 2) |
| 698 | transport_all_task_dev_remove_state(cmd); |
| 699 | |
| 700 | /* |
| 701 | * Clear struct se_cmd->se_lun before the transport_off == 2 handoff |
| 702 | * to FE. |
| 703 | */ |
| 704 | if (transport_off == 2) |
| 705 | cmd->se_lun = NULL; |
| 706 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 707 | |
| 708 | complete(&T_TASK(cmd)->t_transport_stop_comp); |
| 709 | return 1; |
| 710 | } |
| 711 | if (transport_off) { |
| 712 | atomic_set(&T_TASK(cmd)->t_transport_active, 0); |
| 713 | if (transport_off == 2) { |
| 714 | transport_all_task_dev_remove_state(cmd); |
| 715 | /* |
| 716 | * Clear struct se_cmd->se_lun before the transport_off == 2 |
| 717 | * handoff to fabric module. |
| 718 | */ |
| 719 | cmd->se_lun = NULL; |
| 720 | /* |
| 721 | * Some fabric modules like tcm_loop can release |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 722 | * their internally allocated I/O reference now and |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 723 | * struct se_cmd now. |
| 724 | */ |
| 725 | if (CMD_TFO(cmd)->check_stop_free != NULL) { |
| 726 | spin_unlock_irqrestore( |
| 727 | &T_TASK(cmd)->t_state_lock, flags); |
| 728 | |
| 729 | CMD_TFO(cmd)->check_stop_free(cmd); |
| 730 | return 1; |
| 731 | } |
| 732 | } |
| 733 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 734 | |
| 735 | return 0; |
| 736 | } else if (t_state) |
| 737 | cmd->t_state = t_state; |
| 738 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 739 | |
| 740 | return 0; |
| 741 | } |
| 742 | |
| 743 | static int transport_cmd_check_stop_to_fabric(struct se_cmd *cmd) |
| 744 | { |
| 745 | return transport_cmd_check_stop(cmd, 2, 0); |
| 746 | } |
| 747 | |
| 748 | static void transport_lun_remove_cmd(struct se_cmd *cmd) |
| 749 | { |
| 750 | struct se_lun *lun = SE_LUN(cmd); |
| 751 | unsigned long flags; |
| 752 | |
| 753 | if (!lun) |
| 754 | return; |
| 755 | |
| 756 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 757 | if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) { |
| 758 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 759 | goto check_lun; |
| 760 | } |
| 761 | atomic_set(&T_TASK(cmd)->transport_dev_active, 0); |
| 762 | transport_all_task_dev_remove_state(cmd); |
| 763 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 764 | |
| 765 | transport_free_dev_tasks(cmd); |
| 766 | |
| 767 | check_lun: |
| 768 | spin_lock_irqsave(&lun->lun_cmd_lock, flags); |
| 769 | if (atomic_read(&T_TASK(cmd)->transport_lun_active)) { |
| 770 | list_del(&cmd->se_lun_list); |
| 771 | atomic_set(&T_TASK(cmd)->transport_lun_active, 0); |
| 772 | #if 0 |
| 773 | printk(KERN_INFO "Removed ITT: 0x%08x from LUN LIST[%d]\n" |
| 774 | CMD_TFO(cmd)->get_task_tag(cmd), lun->unpacked_lun); |
| 775 | #endif |
| 776 | } |
| 777 | spin_unlock_irqrestore(&lun->lun_cmd_lock, flags); |
| 778 | } |
| 779 | |
| 780 | void transport_cmd_finish_abort(struct se_cmd *cmd, int remove) |
| 781 | { |
| 782 | transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj); |
| 783 | transport_lun_remove_cmd(cmd); |
| 784 | |
| 785 | if (transport_cmd_check_stop_to_fabric(cmd)) |
| 786 | return; |
| 787 | if (remove) |
| 788 | transport_generic_remove(cmd, 0, 0); |
| 789 | } |
| 790 | |
| 791 | void transport_cmd_finish_abort_tmr(struct se_cmd *cmd) |
| 792 | { |
| 793 | transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj); |
| 794 | |
| 795 | if (transport_cmd_check_stop_to_fabric(cmd)) |
| 796 | return; |
| 797 | |
| 798 | transport_generic_remove(cmd, 0, 0); |
| 799 | } |
| 800 | |
| 801 | static int transport_add_cmd_to_queue( |
| 802 | struct se_cmd *cmd, |
| 803 | int t_state) |
| 804 | { |
| 805 | struct se_device *dev = cmd->se_dev; |
| 806 | struct se_queue_obj *qobj = dev->dev_queue_obj; |
| 807 | struct se_queue_req *qr; |
| 808 | unsigned long flags; |
| 809 | |
| 810 | qr = kzalloc(sizeof(struct se_queue_req), GFP_ATOMIC); |
| 811 | if (!(qr)) { |
| 812 | printk(KERN_ERR "Unable to allocate memory for" |
| 813 | " struct se_queue_req\n"); |
| 814 | return -1; |
| 815 | } |
| 816 | INIT_LIST_HEAD(&qr->qr_list); |
| 817 | |
| 818 | qr->cmd = (void *)cmd; |
| 819 | qr->state = t_state; |
| 820 | |
| 821 | if (t_state) { |
| 822 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 823 | cmd->t_state = t_state; |
| 824 | atomic_set(&T_TASK(cmd)->t_transport_active, 1); |
| 825 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 826 | } |
| 827 | |
| 828 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); |
| 829 | list_add_tail(&qr->qr_list, &qobj->qobj_list); |
| 830 | atomic_inc(&T_TASK(cmd)->t_transport_queue_active); |
| 831 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
| 832 | |
| 833 | atomic_inc(&qobj->queue_cnt); |
| 834 | wake_up_interruptible(&qobj->thread_wq); |
| 835 | return 0; |
| 836 | } |
| 837 | |
| 838 | /* |
| 839 | * Called with struct se_queue_obj->cmd_queue_lock held. |
| 840 | */ |
| 841 | static struct se_queue_req * |
| 842 | __transport_get_qr_from_queue(struct se_queue_obj *qobj) |
| 843 | { |
| 844 | struct se_cmd *cmd; |
| 845 | struct se_queue_req *qr = NULL; |
| 846 | |
| 847 | if (list_empty(&qobj->qobj_list)) |
| 848 | return NULL; |
| 849 | |
| 850 | list_for_each_entry(qr, &qobj->qobj_list, qr_list) |
| 851 | break; |
| 852 | |
| 853 | if (qr->cmd) { |
| 854 | cmd = (struct se_cmd *)qr->cmd; |
| 855 | atomic_dec(&T_TASK(cmd)->t_transport_queue_active); |
| 856 | } |
| 857 | list_del(&qr->qr_list); |
| 858 | atomic_dec(&qobj->queue_cnt); |
| 859 | |
| 860 | return qr; |
| 861 | } |
| 862 | |
| 863 | static struct se_queue_req * |
| 864 | transport_get_qr_from_queue(struct se_queue_obj *qobj) |
| 865 | { |
| 866 | struct se_cmd *cmd; |
| 867 | struct se_queue_req *qr; |
| 868 | unsigned long flags; |
| 869 | |
| 870 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); |
| 871 | if (list_empty(&qobj->qobj_list)) { |
| 872 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
| 873 | return NULL; |
| 874 | } |
| 875 | |
| 876 | list_for_each_entry(qr, &qobj->qobj_list, qr_list) |
| 877 | break; |
| 878 | |
| 879 | if (qr->cmd) { |
| 880 | cmd = (struct se_cmd *)qr->cmd; |
| 881 | atomic_dec(&T_TASK(cmd)->t_transport_queue_active); |
| 882 | } |
| 883 | list_del(&qr->qr_list); |
| 884 | atomic_dec(&qobj->queue_cnt); |
| 885 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
| 886 | |
| 887 | return qr; |
| 888 | } |
| 889 | |
| 890 | static void transport_remove_cmd_from_queue(struct se_cmd *cmd, |
| 891 | struct se_queue_obj *qobj) |
| 892 | { |
| 893 | struct se_cmd *q_cmd; |
| 894 | struct se_queue_req *qr = NULL, *qr_p = NULL; |
| 895 | unsigned long flags; |
| 896 | |
| 897 | spin_lock_irqsave(&qobj->cmd_queue_lock, flags); |
| 898 | if (!(atomic_read(&T_TASK(cmd)->t_transport_queue_active))) { |
| 899 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
| 900 | return; |
| 901 | } |
| 902 | |
| 903 | list_for_each_entry_safe(qr, qr_p, &qobj->qobj_list, qr_list) { |
| 904 | q_cmd = (struct se_cmd *)qr->cmd; |
| 905 | if (q_cmd != cmd) |
| 906 | continue; |
| 907 | |
| 908 | atomic_dec(&T_TASK(q_cmd)->t_transport_queue_active); |
| 909 | atomic_dec(&qobj->queue_cnt); |
| 910 | list_del(&qr->qr_list); |
| 911 | kfree(qr); |
| 912 | } |
| 913 | spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); |
| 914 | |
| 915 | if (atomic_read(&T_TASK(cmd)->t_transport_queue_active)) { |
| 916 | printk(KERN_ERR "ITT: 0x%08x t_transport_queue_active: %d\n", |
| 917 | CMD_TFO(cmd)->get_task_tag(cmd), |
| 918 | atomic_read(&T_TASK(cmd)->t_transport_queue_active)); |
| 919 | } |
| 920 | } |
| 921 | |
| 922 | /* |
| 923 | * Completion function used by TCM subsystem plugins (such as FILEIO) |
| 924 | * for queueing up response from struct se_subsystem_api->do_task() |
| 925 | */ |
| 926 | void transport_complete_sync_cache(struct se_cmd *cmd, int good) |
| 927 | { |
| 928 | struct se_task *task = list_entry(T_TASK(cmd)->t_task_list.next, |
| 929 | struct se_task, t_list); |
| 930 | |
| 931 | if (good) { |
| 932 | cmd->scsi_status = SAM_STAT_GOOD; |
| 933 | task->task_scsi_status = GOOD; |
| 934 | } else { |
| 935 | task->task_scsi_status = SAM_STAT_CHECK_CONDITION; |
| 936 | task->task_error_status = PYX_TRANSPORT_ILLEGAL_REQUEST; |
| 937 | TASK_CMD(task)->transport_error_status = |
| 938 | PYX_TRANSPORT_ILLEGAL_REQUEST; |
| 939 | } |
| 940 | |
| 941 | transport_complete_task(task, good); |
| 942 | } |
| 943 | EXPORT_SYMBOL(transport_complete_sync_cache); |
| 944 | |
| 945 | /* transport_complete_task(): |
| 946 | * |
| 947 | * Called from interrupt and non interrupt context depending |
| 948 | * on the transport plugin. |
| 949 | */ |
| 950 | void transport_complete_task(struct se_task *task, int success) |
| 951 | { |
| 952 | struct se_cmd *cmd = TASK_CMD(task); |
| 953 | struct se_device *dev = task->se_dev; |
| 954 | int t_state; |
| 955 | unsigned long flags; |
| 956 | #if 0 |
| 957 | printk(KERN_INFO "task: %p CDB: 0x%02x obj_ptr: %p\n", task, |
| 958 | T_TASK(cmd)->t_task_cdb[0], dev); |
| 959 | #endif |
| 960 | if (dev) { |
| 961 | spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags); |
| 962 | atomic_inc(&dev->depth_left); |
| 963 | atomic_inc(&SE_HBA(dev)->left_queue_depth); |
| 964 | spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags); |
| 965 | } |
| 966 | |
| 967 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 968 | atomic_set(&task->task_active, 0); |
| 969 | |
| 970 | /* |
| 971 | * See if any sense data exists, if so set the TASK_SENSE flag. |
| 972 | * Also check for any other post completion work that needs to be |
| 973 | * done by the plugins. |
| 974 | */ |
| 975 | if (dev && dev->transport->transport_complete) { |
| 976 | if (dev->transport->transport_complete(task) != 0) { |
| 977 | cmd->se_cmd_flags |= SCF_TRANSPORT_TASK_SENSE; |
| 978 | task->task_sense = 1; |
| 979 | success = 1; |
| 980 | } |
| 981 | } |
| 982 | |
| 983 | /* |
| 984 | * See if we are waiting for outstanding struct se_task |
| 985 | * to complete for an exception condition |
| 986 | */ |
| 987 | if (atomic_read(&task->task_stop)) { |
| 988 | /* |
| 989 | * Decrement T_TASK(cmd)->t_se_count if this task had |
| 990 | * previously thrown its timeout exception handler. |
| 991 | */ |
| 992 | if (atomic_read(&task->task_timeout)) { |
| 993 | atomic_dec(&T_TASK(cmd)->t_se_count); |
| 994 | atomic_set(&task->task_timeout, 0); |
| 995 | } |
| 996 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 997 | |
| 998 | complete(&task->task_stop_comp); |
| 999 | return; |
| 1000 | } |
| 1001 | /* |
| 1002 | * If the task's timeout handler has fired, use the t_task_cdbs_timeout |
| 1003 | * left counter to determine when the struct se_cmd is ready to be queued to |
| 1004 | * the processing thread. |
| 1005 | */ |
| 1006 | if (atomic_read(&task->task_timeout)) { |
| 1007 | if (!(atomic_dec_and_test( |
| 1008 | &T_TASK(cmd)->t_task_cdbs_timeout_left))) { |
| 1009 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, |
| 1010 | flags); |
| 1011 | return; |
| 1012 | } |
| 1013 | t_state = TRANSPORT_COMPLETE_TIMEOUT; |
| 1014 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 1015 | |
| 1016 | transport_add_cmd_to_queue(cmd, t_state); |
| 1017 | return; |
| 1018 | } |
| 1019 | atomic_dec(&T_TASK(cmd)->t_task_cdbs_timeout_left); |
| 1020 | |
| 1021 | /* |
| 1022 | * Decrement the outstanding t_task_cdbs_left count. The last |
| 1023 | * struct se_task from struct se_cmd will complete itself into the |
| 1024 | * device queue depending upon int success. |
| 1025 | */ |
| 1026 | if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_left))) { |
| 1027 | if (!success) |
| 1028 | T_TASK(cmd)->t_tasks_failed = 1; |
| 1029 | |
| 1030 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 1031 | return; |
| 1032 | } |
| 1033 | |
| 1034 | if (!success || T_TASK(cmd)->t_tasks_failed) { |
| 1035 | t_state = TRANSPORT_COMPLETE_FAILURE; |
| 1036 | if (!task->task_error_status) { |
| 1037 | task->task_error_status = |
| 1038 | PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
| 1039 | cmd->transport_error_status = |
| 1040 | PYX_TRANSPORT_UNKNOWN_SAM_OPCODE; |
| 1041 | } |
| 1042 | } else { |
| 1043 | atomic_set(&T_TASK(cmd)->t_transport_complete, 1); |
| 1044 | t_state = TRANSPORT_COMPLETE_OK; |
| 1045 | } |
| 1046 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 1047 | |
| 1048 | transport_add_cmd_to_queue(cmd, t_state); |
| 1049 | } |
| 1050 | EXPORT_SYMBOL(transport_complete_task); |
| 1051 | |
| 1052 | /* |
| 1053 | * Called by transport_add_tasks_from_cmd() once a struct se_cmd's |
| 1054 | * struct se_task list are ready to be added to the active execution list |
| 1055 | * struct se_device |
| 1056 | |
| 1057 | * Called with se_dev_t->execute_task_lock called. |
| 1058 | */ |
| 1059 | static inline int transport_add_task_check_sam_attr( |
| 1060 | struct se_task *task, |
| 1061 | struct se_task *task_prev, |
| 1062 | struct se_device *dev) |
| 1063 | { |
| 1064 | /* |
| 1065 | * No SAM Task attribute emulation enabled, add to tail of |
| 1066 | * execution queue |
| 1067 | */ |
| 1068 | if (dev->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) { |
| 1069 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); |
| 1070 | return 0; |
| 1071 | } |
| 1072 | /* |
| 1073 | * HEAD_OF_QUEUE attribute for received CDB, which means |
| 1074 | * the first task that is associated with a struct se_cmd goes to |
| 1075 | * head of the struct se_device->execute_task_list, and task_prev |
| 1076 | * after that for each subsequent task |
| 1077 | */ |
| 1078 | if (task->task_se_cmd->sam_task_attr == TASK_ATTR_HOQ) { |
| 1079 | list_add(&task->t_execute_list, |
| 1080 | (task_prev != NULL) ? |
| 1081 | &task_prev->t_execute_list : |
| 1082 | &dev->execute_task_list); |
| 1083 | |
| 1084 | DEBUG_STA("Set HEAD_OF_QUEUE for task CDB: 0x%02x" |
| 1085 | " in execution queue\n", |
| 1086 | T_TASK(task->task_se_cmd)->t_task_cdb[0]); |
| 1087 | return 1; |
| 1088 | } |
| 1089 | /* |
| 1090 | * For ORDERED, SIMPLE or UNTAGGED attribute tasks once they have been |
| 1091 | * transitioned from Dermant -> Active state, and are added to the end |
| 1092 | * of the struct se_device->execute_task_list |
| 1093 | */ |
| 1094 | list_add_tail(&task->t_execute_list, &dev->execute_task_list); |
| 1095 | return 0; |
| 1096 | } |
| 1097 | |
| 1098 | /* __transport_add_task_to_execute_queue(): |
| 1099 | * |
| 1100 | * Called with se_dev_t->execute_task_lock called. |
| 1101 | */ |
| 1102 | static void __transport_add_task_to_execute_queue( |
| 1103 | struct se_task *task, |
| 1104 | struct se_task *task_prev, |
| 1105 | struct se_device *dev) |
| 1106 | { |
| 1107 | int head_of_queue; |
| 1108 | |
| 1109 | head_of_queue = transport_add_task_check_sam_attr(task, task_prev, dev); |
| 1110 | atomic_inc(&dev->execute_tasks); |
| 1111 | |
| 1112 | if (atomic_read(&task->task_state_active)) |
| 1113 | return; |
| 1114 | /* |
| 1115 | * Determine if this task needs to go to HEAD_OF_QUEUE for the |
| 1116 | * state list as well. Running with SAM Task Attribute emulation |
| 1117 | * will always return head_of_queue == 0 here |
| 1118 | */ |
| 1119 | if (head_of_queue) |
| 1120 | list_add(&task->t_state_list, (task_prev) ? |
| 1121 | &task_prev->t_state_list : |
| 1122 | &dev->state_task_list); |
| 1123 | else |
| 1124 | list_add_tail(&task->t_state_list, &dev->state_task_list); |
| 1125 | |
| 1126 | atomic_set(&task->task_state_active, 1); |
| 1127 | |
| 1128 | DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n", |
| 1129 | CMD_TFO(task->task_se_cmd)->get_task_tag(task->task_se_cmd), |
| 1130 | task, dev); |
| 1131 | } |
| 1132 | |
| 1133 | static void transport_add_tasks_to_state_queue(struct se_cmd *cmd) |
| 1134 | { |
| 1135 | struct se_device *dev; |
| 1136 | struct se_task *task; |
| 1137 | unsigned long flags; |
| 1138 | |
| 1139 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 1140 | list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) { |
| 1141 | dev = task->se_dev; |
| 1142 | |
| 1143 | if (atomic_read(&task->task_state_active)) |
| 1144 | continue; |
| 1145 | |
| 1146 | spin_lock(&dev->execute_task_lock); |
| 1147 | list_add_tail(&task->t_state_list, &dev->state_task_list); |
| 1148 | atomic_set(&task->task_state_active, 1); |
| 1149 | |
| 1150 | DEBUG_TSTATE("Added ITT: 0x%08x task[%p] to dev: %p\n", |
| 1151 | CMD_TFO(task->task_se_cmd)->get_task_tag( |
| 1152 | task->task_se_cmd), task, dev); |
| 1153 | |
| 1154 | spin_unlock(&dev->execute_task_lock); |
| 1155 | } |
| 1156 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 1157 | } |
| 1158 | |
| 1159 | static void transport_add_tasks_from_cmd(struct se_cmd *cmd) |
| 1160 | { |
| 1161 | struct se_device *dev = SE_DEV(cmd); |
| 1162 | struct se_task *task, *task_prev = NULL; |
| 1163 | unsigned long flags; |
| 1164 | |
| 1165 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
| 1166 | list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) { |
| 1167 | if (atomic_read(&task->task_execute_queue)) |
| 1168 | continue; |
| 1169 | /* |
| 1170 | * __transport_add_task_to_execute_queue() handles the |
| 1171 | * SAM Task Attribute emulation if enabled |
| 1172 | */ |
| 1173 | __transport_add_task_to_execute_queue(task, task_prev, dev); |
| 1174 | atomic_set(&task->task_execute_queue, 1); |
| 1175 | task_prev = task; |
| 1176 | } |
| 1177 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
| 1178 | |
| 1179 | return; |
| 1180 | } |
| 1181 | |
| 1182 | /* transport_get_task_from_execute_queue(): |
| 1183 | * |
| 1184 | * Called with dev->execute_task_lock held. |
| 1185 | */ |
| 1186 | static struct se_task * |
| 1187 | transport_get_task_from_execute_queue(struct se_device *dev) |
| 1188 | { |
| 1189 | struct se_task *task; |
| 1190 | |
| 1191 | if (list_empty(&dev->execute_task_list)) |
| 1192 | return NULL; |
| 1193 | |
| 1194 | list_for_each_entry(task, &dev->execute_task_list, t_execute_list) |
| 1195 | break; |
| 1196 | |
| 1197 | list_del(&task->t_execute_list); |
| 1198 | atomic_dec(&dev->execute_tasks); |
| 1199 | |
| 1200 | return task; |
| 1201 | } |
| 1202 | |
| 1203 | /* transport_remove_task_from_execute_queue(): |
| 1204 | * |
| 1205 | * |
| 1206 | */ |
Nicholas Bellinger | 52208ae | 2011-02-24 16:58:20 -0800 | [diff] [blame] | 1207 | void transport_remove_task_from_execute_queue( |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1208 | struct se_task *task, |
| 1209 | struct se_device *dev) |
| 1210 | { |
| 1211 | unsigned long flags; |
| 1212 | |
| 1213 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
| 1214 | list_del(&task->t_execute_list); |
| 1215 | atomic_dec(&dev->execute_tasks); |
| 1216 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
| 1217 | } |
| 1218 | |
| 1219 | unsigned char *transport_dump_cmd_direction(struct se_cmd *cmd) |
| 1220 | { |
| 1221 | switch (cmd->data_direction) { |
| 1222 | case DMA_NONE: |
| 1223 | return "NONE"; |
| 1224 | case DMA_FROM_DEVICE: |
| 1225 | return "READ"; |
| 1226 | case DMA_TO_DEVICE: |
| 1227 | return "WRITE"; |
| 1228 | case DMA_BIDIRECTIONAL: |
| 1229 | return "BIDI"; |
| 1230 | default: |
| 1231 | break; |
| 1232 | } |
| 1233 | |
| 1234 | return "UNKNOWN"; |
| 1235 | } |
| 1236 | |
| 1237 | void transport_dump_dev_state( |
| 1238 | struct se_device *dev, |
| 1239 | char *b, |
| 1240 | int *bl) |
| 1241 | { |
| 1242 | *bl += sprintf(b + *bl, "Status: "); |
| 1243 | switch (dev->dev_status) { |
| 1244 | case TRANSPORT_DEVICE_ACTIVATED: |
| 1245 | *bl += sprintf(b + *bl, "ACTIVATED"); |
| 1246 | break; |
| 1247 | case TRANSPORT_DEVICE_DEACTIVATED: |
| 1248 | *bl += sprintf(b + *bl, "DEACTIVATED"); |
| 1249 | break; |
| 1250 | case TRANSPORT_DEVICE_SHUTDOWN: |
| 1251 | *bl += sprintf(b + *bl, "SHUTDOWN"); |
| 1252 | break; |
| 1253 | case TRANSPORT_DEVICE_OFFLINE_ACTIVATED: |
| 1254 | case TRANSPORT_DEVICE_OFFLINE_DEACTIVATED: |
| 1255 | *bl += sprintf(b + *bl, "OFFLINE"); |
| 1256 | break; |
| 1257 | default: |
| 1258 | *bl += sprintf(b + *bl, "UNKNOWN=%d", dev->dev_status); |
| 1259 | break; |
| 1260 | } |
| 1261 | |
| 1262 | *bl += sprintf(b + *bl, " Execute/Left/Max Queue Depth: %d/%d/%d", |
| 1263 | atomic_read(&dev->execute_tasks), atomic_read(&dev->depth_left), |
| 1264 | dev->queue_depth); |
| 1265 | *bl += sprintf(b + *bl, " SectorSize: %u MaxSectors: %u\n", |
| 1266 | DEV_ATTRIB(dev)->block_size, DEV_ATTRIB(dev)->max_sectors); |
| 1267 | *bl += sprintf(b + *bl, " "); |
| 1268 | } |
| 1269 | |
| 1270 | /* transport_release_all_cmds(): |
| 1271 | * |
| 1272 | * |
| 1273 | */ |
| 1274 | static void transport_release_all_cmds(struct se_device *dev) |
| 1275 | { |
| 1276 | struct se_cmd *cmd = NULL; |
| 1277 | struct se_queue_req *qr = NULL, *qr_p = NULL; |
| 1278 | int bug_out = 0, t_state; |
| 1279 | unsigned long flags; |
| 1280 | |
| 1281 | spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags); |
| 1282 | list_for_each_entry_safe(qr, qr_p, &dev->dev_queue_obj->qobj_list, |
| 1283 | qr_list) { |
| 1284 | |
| 1285 | cmd = (struct se_cmd *)qr->cmd; |
| 1286 | t_state = qr->state; |
| 1287 | list_del(&qr->qr_list); |
| 1288 | kfree(qr); |
| 1289 | spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, |
| 1290 | flags); |
| 1291 | |
| 1292 | printk(KERN_ERR "Releasing ITT: 0x%08x, i_state: %u," |
| 1293 | " t_state: %u directly\n", |
| 1294 | CMD_TFO(cmd)->get_task_tag(cmd), |
| 1295 | CMD_TFO(cmd)->get_cmd_state(cmd), t_state); |
| 1296 | |
| 1297 | transport_release_fe_cmd(cmd); |
| 1298 | bug_out = 1; |
| 1299 | |
| 1300 | spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags); |
| 1301 | } |
| 1302 | spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, flags); |
| 1303 | #if 0 |
| 1304 | if (bug_out) |
| 1305 | BUG(); |
| 1306 | #endif |
| 1307 | } |
| 1308 | |
| 1309 | void transport_dump_vpd_proto_id( |
| 1310 | struct t10_vpd *vpd, |
| 1311 | unsigned char *p_buf, |
| 1312 | int p_buf_len) |
| 1313 | { |
| 1314 | unsigned char buf[VPD_TMP_BUF_SIZE]; |
| 1315 | int len; |
| 1316 | |
| 1317 | memset(buf, 0, VPD_TMP_BUF_SIZE); |
| 1318 | len = sprintf(buf, "T10 VPD Protocol Identifier: "); |
| 1319 | |
| 1320 | switch (vpd->protocol_identifier) { |
| 1321 | case 0x00: |
| 1322 | sprintf(buf+len, "Fibre Channel\n"); |
| 1323 | break; |
| 1324 | case 0x10: |
| 1325 | sprintf(buf+len, "Parallel SCSI\n"); |
| 1326 | break; |
| 1327 | case 0x20: |
| 1328 | sprintf(buf+len, "SSA\n"); |
| 1329 | break; |
| 1330 | case 0x30: |
| 1331 | sprintf(buf+len, "IEEE 1394\n"); |
| 1332 | break; |
| 1333 | case 0x40: |
| 1334 | sprintf(buf+len, "SCSI Remote Direct Memory Access" |
| 1335 | " Protocol\n"); |
| 1336 | break; |
| 1337 | case 0x50: |
| 1338 | sprintf(buf+len, "Internet SCSI (iSCSI)\n"); |
| 1339 | break; |
| 1340 | case 0x60: |
| 1341 | sprintf(buf+len, "SAS Serial SCSI Protocol\n"); |
| 1342 | break; |
| 1343 | case 0x70: |
| 1344 | sprintf(buf+len, "Automation/Drive Interface Transport" |
| 1345 | " Protocol\n"); |
| 1346 | break; |
| 1347 | case 0x80: |
| 1348 | sprintf(buf+len, "AT Attachment Interface ATA/ATAPI\n"); |
| 1349 | break; |
| 1350 | default: |
| 1351 | sprintf(buf+len, "Unknown 0x%02x\n", |
| 1352 | vpd->protocol_identifier); |
| 1353 | break; |
| 1354 | } |
| 1355 | |
| 1356 | if (p_buf) |
| 1357 | strncpy(p_buf, buf, p_buf_len); |
| 1358 | else |
| 1359 | printk(KERN_INFO "%s", buf); |
| 1360 | } |
| 1361 | |
| 1362 | void |
| 1363 | transport_set_vpd_proto_id(struct t10_vpd *vpd, unsigned char *page_83) |
| 1364 | { |
| 1365 | /* |
| 1366 | * Check if the Protocol Identifier Valid (PIV) bit is set.. |
| 1367 | * |
| 1368 | * from spc3r23.pdf section 7.5.1 |
| 1369 | */ |
| 1370 | if (page_83[1] & 0x80) { |
| 1371 | vpd->protocol_identifier = (page_83[0] & 0xf0); |
| 1372 | vpd->protocol_identifier_set = 1; |
| 1373 | transport_dump_vpd_proto_id(vpd, NULL, 0); |
| 1374 | } |
| 1375 | } |
| 1376 | EXPORT_SYMBOL(transport_set_vpd_proto_id); |
| 1377 | |
| 1378 | int transport_dump_vpd_assoc( |
| 1379 | struct t10_vpd *vpd, |
| 1380 | unsigned char *p_buf, |
| 1381 | int p_buf_len) |
| 1382 | { |
| 1383 | unsigned char buf[VPD_TMP_BUF_SIZE]; |
| 1384 | int ret = 0, len; |
| 1385 | |
| 1386 | memset(buf, 0, VPD_TMP_BUF_SIZE); |
| 1387 | len = sprintf(buf, "T10 VPD Identifier Association: "); |
| 1388 | |
| 1389 | switch (vpd->association) { |
| 1390 | case 0x00: |
| 1391 | sprintf(buf+len, "addressed logical unit\n"); |
| 1392 | break; |
| 1393 | case 0x10: |
| 1394 | sprintf(buf+len, "target port\n"); |
| 1395 | break; |
| 1396 | case 0x20: |
| 1397 | sprintf(buf+len, "SCSI target device\n"); |
| 1398 | break; |
| 1399 | default: |
| 1400 | sprintf(buf+len, "Unknown 0x%02x\n", vpd->association); |
| 1401 | ret = -1; |
| 1402 | break; |
| 1403 | } |
| 1404 | |
| 1405 | if (p_buf) |
| 1406 | strncpy(p_buf, buf, p_buf_len); |
| 1407 | else |
| 1408 | printk("%s", buf); |
| 1409 | |
| 1410 | return ret; |
| 1411 | } |
| 1412 | |
| 1413 | int transport_set_vpd_assoc(struct t10_vpd *vpd, unsigned char *page_83) |
| 1414 | { |
| 1415 | /* |
| 1416 | * The VPD identification association.. |
| 1417 | * |
| 1418 | * from spc3r23.pdf Section 7.6.3.1 Table 297 |
| 1419 | */ |
| 1420 | vpd->association = (page_83[1] & 0x30); |
| 1421 | return transport_dump_vpd_assoc(vpd, NULL, 0); |
| 1422 | } |
| 1423 | EXPORT_SYMBOL(transport_set_vpd_assoc); |
| 1424 | |
| 1425 | int transport_dump_vpd_ident_type( |
| 1426 | struct t10_vpd *vpd, |
| 1427 | unsigned char *p_buf, |
| 1428 | int p_buf_len) |
| 1429 | { |
| 1430 | unsigned char buf[VPD_TMP_BUF_SIZE]; |
| 1431 | int ret = 0, len; |
| 1432 | |
| 1433 | memset(buf, 0, VPD_TMP_BUF_SIZE); |
| 1434 | len = sprintf(buf, "T10 VPD Identifier Type: "); |
| 1435 | |
| 1436 | switch (vpd->device_identifier_type) { |
| 1437 | case 0x00: |
| 1438 | sprintf(buf+len, "Vendor specific\n"); |
| 1439 | break; |
| 1440 | case 0x01: |
| 1441 | sprintf(buf+len, "T10 Vendor ID based\n"); |
| 1442 | break; |
| 1443 | case 0x02: |
| 1444 | sprintf(buf+len, "EUI-64 based\n"); |
| 1445 | break; |
| 1446 | case 0x03: |
| 1447 | sprintf(buf+len, "NAA\n"); |
| 1448 | break; |
| 1449 | case 0x04: |
| 1450 | sprintf(buf+len, "Relative target port identifier\n"); |
| 1451 | break; |
| 1452 | case 0x08: |
| 1453 | sprintf(buf+len, "SCSI name string\n"); |
| 1454 | break; |
| 1455 | default: |
| 1456 | sprintf(buf+len, "Unsupported: 0x%02x\n", |
| 1457 | vpd->device_identifier_type); |
| 1458 | ret = -1; |
| 1459 | break; |
| 1460 | } |
| 1461 | |
| 1462 | if (p_buf) |
| 1463 | strncpy(p_buf, buf, p_buf_len); |
| 1464 | else |
| 1465 | printk("%s", buf); |
| 1466 | |
| 1467 | return ret; |
| 1468 | } |
| 1469 | |
| 1470 | int transport_set_vpd_ident_type(struct t10_vpd *vpd, unsigned char *page_83) |
| 1471 | { |
| 1472 | /* |
| 1473 | * The VPD identifier type.. |
| 1474 | * |
| 1475 | * from spc3r23.pdf Section 7.6.3.1 Table 298 |
| 1476 | */ |
| 1477 | vpd->device_identifier_type = (page_83[1] & 0x0f); |
| 1478 | return transport_dump_vpd_ident_type(vpd, NULL, 0); |
| 1479 | } |
| 1480 | EXPORT_SYMBOL(transport_set_vpd_ident_type); |
| 1481 | |
| 1482 | int transport_dump_vpd_ident( |
| 1483 | struct t10_vpd *vpd, |
| 1484 | unsigned char *p_buf, |
| 1485 | int p_buf_len) |
| 1486 | { |
| 1487 | unsigned char buf[VPD_TMP_BUF_SIZE]; |
| 1488 | int ret = 0; |
| 1489 | |
| 1490 | memset(buf, 0, VPD_TMP_BUF_SIZE); |
| 1491 | |
| 1492 | switch (vpd->device_identifier_code_set) { |
| 1493 | case 0x01: /* Binary */ |
| 1494 | sprintf(buf, "T10 VPD Binary Device Identifier: %s\n", |
| 1495 | &vpd->device_identifier[0]); |
| 1496 | break; |
| 1497 | case 0x02: /* ASCII */ |
| 1498 | sprintf(buf, "T10 VPD ASCII Device Identifier: %s\n", |
| 1499 | &vpd->device_identifier[0]); |
| 1500 | break; |
| 1501 | case 0x03: /* UTF-8 */ |
| 1502 | sprintf(buf, "T10 VPD UTF-8 Device Identifier: %s\n", |
| 1503 | &vpd->device_identifier[0]); |
| 1504 | break; |
| 1505 | default: |
| 1506 | sprintf(buf, "T10 VPD Device Identifier encoding unsupported:" |
| 1507 | " 0x%02x", vpd->device_identifier_code_set); |
| 1508 | ret = -1; |
| 1509 | break; |
| 1510 | } |
| 1511 | |
| 1512 | if (p_buf) |
| 1513 | strncpy(p_buf, buf, p_buf_len); |
| 1514 | else |
| 1515 | printk("%s", buf); |
| 1516 | |
| 1517 | return ret; |
| 1518 | } |
| 1519 | |
| 1520 | int |
| 1521 | transport_set_vpd_ident(struct t10_vpd *vpd, unsigned char *page_83) |
| 1522 | { |
| 1523 | static const char hex_str[] = "0123456789abcdef"; |
| 1524 | int j = 0, i = 4; /* offset to start of the identifer */ |
| 1525 | |
| 1526 | /* |
| 1527 | * The VPD Code Set (encoding) |
| 1528 | * |
| 1529 | * from spc3r23.pdf Section 7.6.3.1 Table 296 |
| 1530 | */ |
| 1531 | vpd->device_identifier_code_set = (page_83[0] & 0x0f); |
| 1532 | switch (vpd->device_identifier_code_set) { |
| 1533 | case 0x01: /* Binary */ |
| 1534 | vpd->device_identifier[j++] = |
| 1535 | hex_str[vpd->device_identifier_type]; |
| 1536 | while (i < (4 + page_83[3])) { |
| 1537 | vpd->device_identifier[j++] = |
| 1538 | hex_str[(page_83[i] & 0xf0) >> 4]; |
| 1539 | vpd->device_identifier[j++] = |
| 1540 | hex_str[page_83[i] & 0x0f]; |
| 1541 | i++; |
| 1542 | } |
| 1543 | break; |
| 1544 | case 0x02: /* ASCII */ |
| 1545 | case 0x03: /* UTF-8 */ |
| 1546 | while (i < (4 + page_83[3])) |
| 1547 | vpd->device_identifier[j++] = page_83[i++]; |
| 1548 | break; |
| 1549 | default: |
| 1550 | break; |
| 1551 | } |
| 1552 | |
| 1553 | return transport_dump_vpd_ident(vpd, NULL, 0); |
| 1554 | } |
| 1555 | EXPORT_SYMBOL(transport_set_vpd_ident); |
| 1556 | |
| 1557 | static void core_setup_task_attr_emulation(struct se_device *dev) |
| 1558 | { |
| 1559 | /* |
| 1560 | * If this device is from Target_Core_Mod/pSCSI, disable the |
| 1561 | * SAM Task Attribute emulation. |
| 1562 | * |
| 1563 | * This is currently not available in upsream Linux/SCSI Target |
| 1564 | * mode code, and is assumed to be disabled while using TCM/pSCSI. |
| 1565 | */ |
| 1566 | if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) { |
| 1567 | dev->dev_task_attr_type = SAM_TASK_ATTR_PASSTHROUGH; |
| 1568 | return; |
| 1569 | } |
| 1570 | |
| 1571 | dev->dev_task_attr_type = SAM_TASK_ATTR_EMULATED; |
| 1572 | DEBUG_STA("%s: Using SAM_TASK_ATTR_EMULATED for SPC: 0x%02x" |
| 1573 | " device\n", TRANSPORT(dev)->name, |
| 1574 | TRANSPORT(dev)->get_device_rev(dev)); |
| 1575 | } |
| 1576 | |
| 1577 | static void scsi_dump_inquiry(struct se_device *dev) |
| 1578 | { |
| 1579 | struct t10_wwn *wwn = DEV_T10_WWN(dev); |
| 1580 | int i, device_type; |
| 1581 | /* |
| 1582 | * Print Linux/SCSI style INQUIRY formatting to the kernel ring buffer |
| 1583 | */ |
| 1584 | printk(" Vendor: "); |
| 1585 | for (i = 0; i < 8; i++) |
| 1586 | if (wwn->vendor[i] >= 0x20) |
| 1587 | printk("%c", wwn->vendor[i]); |
| 1588 | else |
| 1589 | printk(" "); |
| 1590 | |
| 1591 | printk(" Model: "); |
| 1592 | for (i = 0; i < 16; i++) |
| 1593 | if (wwn->model[i] >= 0x20) |
| 1594 | printk("%c", wwn->model[i]); |
| 1595 | else |
| 1596 | printk(" "); |
| 1597 | |
| 1598 | printk(" Revision: "); |
| 1599 | for (i = 0; i < 4; i++) |
| 1600 | if (wwn->revision[i] >= 0x20) |
| 1601 | printk("%c", wwn->revision[i]); |
| 1602 | else |
| 1603 | printk(" "); |
| 1604 | |
| 1605 | printk("\n"); |
| 1606 | |
| 1607 | device_type = TRANSPORT(dev)->get_device_type(dev); |
| 1608 | printk(" Type: %s ", scsi_device_type(device_type)); |
| 1609 | printk(" ANSI SCSI revision: %02x\n", |
| 1610 | TRANSPORT(dev)->get_device_rev(dev)); |
| 1611 | } |
| 1612 | |
| 1613 | struct se_device *transport_add_device_to_core_hba( |
| 1614 | struct se_hba *hba, |
| 1615 | struct se_subsystem_api *transport, |
| 1616 | struct se_subsystem_dev *se_dev, |
| 1617 | u32 device_flags, |
| 1618 | void *transport_dev, |
| 1619 | struct se_dev_limits *dev_limits, |
| 1620 | const char *inquiry_prod, |
| 1621 | const char *inquiry_rev) |
| 1622 | { |
Nicholas Bellinger | 12a18bd | 2011-03-14 04:06:06 -0700 | [diff] [blame] | 1623 | int force_pt; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1624 | struct se_device *dev; |
| 1625 | |
| 1626 | dev = kzalloc(sizeof(struct se_device), GFP_KERNEL); |
| 1627 | if (!(dev)) { |
| 1628 | printk(KERN_ERR "Unable to allocate memory for se_dev_t\n"); |
| 1629 | return NULL; |
| 1630 | } |
| 1631 | dev->dev_queue_obj = kzalloc(sizeof(struct se_queue_obj), GFP_KERNEL); |
| 1632 | if (!(dev->dev_queue_obj)) { |
| 1633 | printk(KERN_ERR "Unable to allocate memory for" |
| 1634 | " dev->dev_queue_obj\n"); |
| 1635 | kfree(dev); |
| 1636 | return NULL; |
| 1637 | } |
| 1638 | transport_init_queue_obj(dev->dev_queue_obj); |
| 1639 | |
| 1640 | dev->dev_status_queue_obj = kzalloc(sizeof(struct se_queue_obj), |
| 1641 | GFP_KERNEL); |
| 1642 | if (!(dev->dev_status_queue_obj)) { |
| 1643 | printk(KERN_ERR "Unable to allocate memory for" |
| 1644 | " dev->dev_status_queue_obj\n"); |
| 1645 | kfree(dev->dev_queue_obj); |
| 1646 | kfree(dev); |
| 1647 | return NULL; |
| 1648 | } |
| 1649 | transport_init_queue_obj(dev->dev_status_queue_obj); |
| 1650 | |
| 1651 | dev->dev_flags = device_flags; |
| 1652 | dev->dev_status |= TRANSPORT_DEVICE_DEACTIVATED; |
| 1653 | dev->dev_ptr = (void *) transport_dev; |
| 1654 | dev->se_hba = hba; |
| 1655 | dev->se_sub_dev = se_dev; |
| 1656 | dev->transport = transport; |
| 1657 | atomic_set(&dev->active_cmds, 0); |
| 1658 | INIT_LIST_HEAD(&dev->dev_list); |
| 1659 | INIT_LIST_HEAD(&dev->dev_sep_list); |
| 1660 | INIT_LIST_HEAD(&dev->dev_tmr_list); |
| 1661 | INIT_LIST_HEAD(&dev->execute_task_list); |
| 1662 | INIT_LIST_HEAD(&dev->delayed_cmd_list); |
| 1663 | INIT_LIST_HEAD(&dev->ordered_cmd_list); |
| 1664 | INIT_LIST_HEAD(&dev->state_task_list); |
| 1665 | spin_lock_init(&dev->execute_task_lock); |
| 1666 | spin_lock_init(&dev->delayed_cmd_lock); |
| 1667 | spin_lock_init(&dev->ordered_cmd_lock); |
| 1668 | spin_lock_init(&dev->state_task_lock); |
| 1669 | spin_lock_init(&dev->dev_alua_lock); |
| 1670 | spin_lock_init(&dev->dev_reservation_lock); |
| 1671 | spin_lock_init(&dev->dev_status_lock); |
| 1672 | spin_lock_init(&dev->dev_status_thr_lock); |
| 1673 | spin_lock_init(&dev->se_port_lock); |
| 1674 | spin_lock_init(&dev->se_tmr_lock); |
| 1675 | |
| 1676 | dev->queue_depth = dev_limits->queue_depth; |
| 1677 | atomic_set(&dev->depth_left, dev->queue_depth); |
| 1678 | atomic_set(&dev->dev_ordered_id, 0); |
| 1679 | |
| 1680 | se_dev_set_default_attribs(dev, dev_limits); |
| 1681 | |
| 1682 | dev->dev_index = scsi_get_new_index(SCSI_DEVICE_INDEX); |
| 1683 | dev->creation_time = get_jiffies_64(); |
| 1684 | spin_lock_init(&dev->stats_lock); |
| 1685 | |
| 1686 | spin_lock(&hba->device_lock); |
| 1687 | list_add_tail(&dev->dev_list, &hba->hba_dev_list); |
| 1688 | hba->dev_count++; |
| 1689 | spin_unlock(&hba->device_lock); |
| 1690 | /* |
| 1691 | * Setup the SAM Task Attribute emulation for struct se_device |
| 1692 | */ |
| 1693 | core_setup_task_attr_emulation(dev); |
| 1694 | /* |
| 1695 | * Force PR and ALUA passthrough emulation with internal object use. |
| 1696 | */ |
| 1697 | force_pt = (hba->hba_flags & HBA_FLAGS_INTERNAL_USE); |
| 1698 | /* |
| 1699 | * Setup the Reservations infrastructure for struct se_device |
| 1700 | */ |
| 1701 | core_setup_reservations(dev, force_pt); |
| 1702 | /* |
| 1703 | * Setup the Asymmetric Logical Unit Assignment for struct se_device |
| 1704 | */ |
| 1705 | if (core_setup_alua(dev, force_pt) < 0) |
| 1706 | goto out; |
| 1707 | |
| 1708 | /* |
| 1709 | * Startup the struct se_device processing thread |
| 1710 | */ |
| 1711 | dev->process_thread = kthread_run(transport_processing_thread, dev, |
| 1712 | "LIO_%s", TRANSPORT(dev)->name); |
| 1713 | if (IS_ERR(dev->process_thread)) { |
| 1714 | printk(KERN_ERR "Unable to create kthread: LIO_%s\n", |
| 1715 | TRANSPORT(dev)->name); |
| 1716 | goto out; |
| 1717 | } |
| 1718 | |
| 1719 | /* |
| 1720 | * Preload the initial INQUIRY const values if we are doing |
| 1721 | * anything virtual (IBLOCK, FILEIO, RAMDISK), but not for TCM/pSCSI |
| 1722 | * passthrough because this is being provided by the backend LLD. |
| 1723 | * This is required so that transport_get_inquiry() copies these |
| 1724 | * originals once back into DEV_T10_WWN(dev) for the virtual device |
| 1725 | * setup. |
| 1726 | */ |
| 1727 | if (TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) { |
| 1728 | if (!(inquiry_prod) || !(inquiry_prod)) { |
| 1729 | printk(KERN_ERR "All non TCM/pSCSI plugins require" |
| 1730 | " INQUIRY consts\n"); |
| 1731 | goto out; |
| 1732 | } |
| 1733 | |
| 1734 | strncpy(&DEV_T10_WWN(dev)->vendor[0], "LIO-ORG", 8); |
| 1735 | strncpy(&DEV_T10_WWN(dev)->model[0], inquiry_prod, 16); |
| 1736 | strncpy(&DEV_T10_WWN(dev)->revision[0], inquiry_rev, 4); |
| 1737 | } |
| 1738 | scsi_dump_inquiry(dev); |
| 1739 | |
Nicholas Bellinger | 12a18bd | 2011-03-14 04:06:06 -0700 | [diff] [blame] | 1740 | return dev; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1741 | out: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 1742 | kthread_stop(dev->process_thread); |
| 1743 | |
| 1744 | spin_lock(&hba->device_lock); |
| 1745 | list_del(&dev->dev_list); |
| 1746 | hba->dev_count--; |
| 1747 | spin_unlock(&hba->device_lock); |
| 1748 | |
| 1749 | se_release_vpd_for_dev(dev); |
| 1750 | |
| 1751 | kfree(dev->dev_status_queue_obj); |
| 1752 | kfree(dev->dev_queue_obj); |
| 1753 | kfree(dev); |
| 1754 | |
| 1755 | return NULL; |
| 1756 | } |
| 1757 | EXPORT_SYMBOL(transport_add_device_to_core_hba); |
| 1758 | |
| 1759 | /* transport_generic_prepare_cdb(): |
| 1760 | * |
| 1761 | * Since the Initiator sees iSCSI devices as LUNs, the SCSI CDB will |
| 1762 | * contain the iSCSI LUN in bits 7-5 of byte 1 as per SAM-2. |
| 1763 | * The point of this is since we are mapping iSCSI LUNs to |
| 1764 | * SCSI Target IDs having a non-zero LUN in the CDB will throw the |
| 1765 | * devices and HBAs for a loop. |
| 1766 | */ |
| 1767 | static inline void transport_generic_prepare_cdb( |
| 1768 | unsigned char *cdb) |
| 1769 | { |
| 1770 | switch (cdb[0]) { |
| 1771 | case READ_10: /* SBC - RDProtect */ |
| 1772 | case READ_12: /* SBC - RDProtect */ |
| 1773 | case READ_16: /* SBC - RDProtect */ |
| 1774 | case SEND_DIAGNOSTIC: /* SPC - SELF-TEST Code */ |
| 1775 | case VERIFY: /* SBC - VRProtect */ |
| 1776 | case VERIFY_16: /* SBC - VRProtect */ |
| 1777 | case WRITE_VERIFY: /* SBC - VRProtect */ |
| 1778 | case WRITE_VERIFY_12: /* SBC - VRProtect */ |
| 1779 | break; |
| 1780 | default: |
| 1781 | cdb[1] &= 0x1f; /* clear logical unit number */ |
| 1782 | break; |
| 1783 | } |
| 1784 | } |
| 1785 | |
| 1786 | static struct se_task * |
| 1787 | transport_generic_get_task(struct se_cmd *cmd, |
| 1788 | enum dma_data_direction data_direction) |
| 1789 | { |
| 1790 | struct se_task *task; |
| 1791 | struct se_device *dev = SE_DEV(cmd); |
| 1792 | unsigned long flags; |
| 1793 | |
| 1794 | task = dev->transport->alloc_task(cmd); |
| 1795 | if (!task) { |
| 1796 | printk(KERN_ERR "Unable to allocate struct se_task\n"); |
| 1797 | return NULL; |
| 1798 | } |
| 1799 | |
| 1800 | INIT_LIST_HEAD(&task->t_list); |
| 1801 | INIT_LIST_HEAD(&task->t_execute_list); |
| 1802 | INIT_LIST_HEAD(&task->t_state_list); |
| 1803 | init_completion(&task->task_stop_comp); |
| 1804 | task->task_no = T_TASK(cmd)->t_tasks_no++; |
| 1805 | task->task_se_cmd = cmd; |
| 1806 | task->se_dev = dev; |
| 1807 | task->task_data_direction = data_direction; |
| 1808 | |
| 1809 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 1810 | list_add_tail(&task->t_list, &T_TASK(cmd)->t_task_list); |
| 1811 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 1812 | |
| 1813 | return task; |
| 1814 | } |
| 1815 | |
| 1816 | static int transport_generic_cmd_sequencer(struct se_cmd *, unsigned char *); |
| 1817 | |
| 1818 | void transport_device_setup_cmd(struct se_cmd *cmd) |
| 1819 | { |
| 1820 | cmd->se_dev = SE_LUN(cmd)->lun_se_dev; |
| 1821 | } |
| 1822 | EXPORT_SYMBOL(transport_device_setup_cmd); |
| 1823 | |
| 1824 | /* |
| 1825 | * Used by fabric modules containing a local struct se_cmd within their |
| 1826 | * fabric dependent per I/O descriptor. |
| 1827 | */ |
| 1828 | void transport_init_se_cmd( |
| 1829 | struct se_cmd *cmd, |
| 1830 | struct target_core_fabric_ops *tfo, |
| 1831 | struct se_session *se_sess, |
| 1832 | u32 data_length, |
| 1833 | int data_direction, |
| 1834 | int task_attr, |
| 1835 | unsigned char *sense_buffer) |
| 1836 | { |
| 1837 | INIT_LIST_HEAD(&cmd->se_lun_list); |
| 1838 | INIT_LIST_HEAD(&cmd->se_delayed_list); |
| 1839 | INIT_LIST_HEAD(&cmd->se_ordered_list); |
| 1840 | /* |
| 1841 | * Setup t_task pointer to t_task_backstore |
| 1842 | */ |
| 1843 | cmd->t_task = &cmd->t_task_backstore; |
| 1844 | |
| 1845 | INIT_LIST_HEAD(&T_TASK(cmd)->t_task_list); |
| 1846 | init_completion(&T_TASK(cmd)->transport_lun_fe_stop_comp); |
| 1847 | init_completion(&T_TASK(cmd)->transport_lun_stop_comp); |
| 1848 | init_completion(&T_TASK(cmd)->t_transport_stop_comp); |
| 1849 | spin_lock_init(&T_TASK(cmd)->t_state_lock); |
| 1850 | atomic_set(&T_TASK(cmd)->transport_dev_active, 1); |
| 1851 | |
| 1852 | cmd->se_tfo = tfo; |
| 1853 | cmd->se_sess = se_sess; |
| 1854 | cmd->data_length = data_length; |
| 1855 | cmd->data_direction = data_direction; |
| 1856 | cmd->sam_task_attr = task_attr; |
| 1857 | cmd->sense_buffer = sense_buffer; |
| 1858 | } |
| 1859 | EXPORT_SYMBOL(transport_init_se_cmd); |
| 1860 | |
| 1861 | static int transport_check_alloc_task_attr(struct se_cmd *cmd) |
| 1862 | { |
| 1863 | /* |
| 1864 | * Check if SAM Task Attribute emulation is enabled for this |
| 1865 | * struct se_device storage object |
| 1866 | */ |
| 1867 | if (SE_DEV(cmd)->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
| 1868 | return 0; |
| 1869 | |
| 1870 | if (cmd->sam_task_attr == TASK_ATTR_ACA) { |
| 1871 | DEBUG_STA("SAM Task Attribute ACA" |
| 1872 | " emulation is not supported\n"); |
| 1873 | return -1; |
| 1874 | } |
| 1875 | /* |
| 1876 | * Used to determine when ORDERED commands should go from |
| 1877 | * Dormant to Active status. |
| 1878 | */ |
| 1879 | cmd->se_ordered_id = atomic_inc_return(&SE_DEV(cmd)->dev_ordered_id); |
| 1880 | smp_mb__after_atomic_inc(); |
| 1881 | DEBUG_STA("Allocated se_ordered_id: %u for Task Attr: 0x%02x on %s\n", |
| 1882 | cmd->se_ordered_id, cmd->sam_task_attr, |
| 1883 | TRANSPORT(cmd->se_dev)->name); |
| 1884 | return 0; |
| 1885 | } |
| 1886 | |
| 1887 | void transport_free_se_cmd( |
| 1888 | struct se_cmd *se_cmd) |
| 1889 | { |
| 1890 | if (se_cmd->se_tmr_req) |
| 1891 | core_tmr_release_req(se_cmd->se_tmr_req); |
| 1892 | /* |
| 1893 | * Check and free any extended CDB buffer that was allocated |
| 1894 | */ |
| 1895 | if (T_TASK(se_cmd)->t_task_cdb != T_TASK(se_cmd)->__t_task_cdb) |
| 1896 | kfree(T_TASK(se_cmd)->t_task_cdb); |
| 1897 | } |
| 1898 | EXPORT_SYMBOL(transport_free_se_cmd); |
| 1899 | |
| 1900 | static void transport_generic_wait_for_tasks(struct se_cmd *, int, int); |
| 1901 | |
| 1902 | /* transport_generic_allocate_tasks(): |
| 1903 | * |
| 1904 | * Called from fabric RX Thread. |
| 1905 | */ |
| 1906 | int transport_generic_allocate_tasks( |
| 1907 | struct se_cmd *cmd, |
| 1908 | unsigned char *cdb) |
| 1909 | { |
| 1910 | int ret; |
| 1911 | |
| 1912 | transport_generic_prepare_cdb(cdb); |
| 1913 | |
| 1914 | /* |
| 1915 | * This is needed for early exceptions. |
| 1916 | */ |
| 1917 | cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks; |
| 1918 | |
| 1919 | transport_device_setup_cmd(cmd); |
| 1920 | /* |
| 1921 | * Ensure that the received CDB is less than the max (252 + 8) bytes |
| 1922 | * for VARIABLE_LENGTH_CMD |
| 1923 | */ |
| 1924 | if (scsi_command_size(cdb) > SCSI_MAX_VARLEN_CDB_SIZE) { |
| 1925 | printk(KERN_ERR "Received SCSI CDB with command_size: %d that" |
| 1926 | " exceeds SCSI_MAX_VARLEN_CDB_SIZE: %d\n", |
| 1927 | scsi_command_size(cdb), SCSI_MAX_VARLEN_CDB_SIZE); |
| 1928 | return -1; |
| 1929 | } |
| 1930 | /* |
| 1931 | * If the received CDB is larger than TCM_MAX_COMMAND_SIZE, |
| 1932 | * allocate the additional extended CDB buffer now.. Otherwise |
| 1933 | * setup the pointer from __t_task_cdb to t_task_cdb. |
| 1934 | */ |
| 1935 | if (scsi_command_size(cdb) > sizeof(T_TASK(cmd)->__t_task_cdb)) { |
| 1936 | T_TASK(cmd)->t_task_cdb = kzalloc(scsi_command_size(cdb), |
| 1937 | GFP_KERNEL); |
| 1938 | if (!(T_TASK(cmd)->t_task_cdb)) { |
| 1939 | printk(KERN_ERR "Unable to allocate T_TASK(cmd)->t_task_cdb" |
| 1940 | " %u > sizeof(T_TASK(cmd)->__t_task_cdb): %lu ops\n", |
| 1941 | scsi_command_size(cdb), |
| 1942 | (unsigned long)sizeof(T_TASK(cmd)->__t_task_cdb)); |
| 1943 | return -1; |
| 1944 | } |
| 1945 | } else |
| 1946 | T_TASK(cmd)->t_task_cdb = &T_TASK(cmd)->__t_task_cdb[0]; |
| 1947 | /* |
| 1948 | * Copy the original CDB into T_TASK(cmd). |
| 1949 | */ |
| 1950 | memcpy(T_TASK(cmd)->t_task_cdb, cdb, scsi_command_size(cdb)); |
| 1951 | /* |
| 1952 | * Setup the received CDB based on SCSI defined opcodes and |
| 1953 | * perform unit attention, persistent reservations and ALUA |
| 1954 | * checks for virtual device backends. The T_TASK(cmd)->t_task_cdb |
| 1955 | * pointer is expected to be setup before we reach this point. |
| 1956 | */ |
| 1957 | ret = transport_generic_cmd_sequencer(cmd, cdb); |
| 1958 | if (ret < 0) |
| 1959 | return ret; |
| 1960 | /* |
| 1961 | * Check for SAM Task Attribute Emulation |
| 1962 | */ |
| 1963 | if (transport_check_alloc_task_attr(cmd) < 0) { |
| 1964 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 1965 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; |
| 1966 | return -2; |
| 1967 | } |
| 1968 | spin_lock(&cmd->se_lun->lun_sep_lock); |
| 1969 | if (cmd->se_lun->lun_sep) |
| 1970 | cmd->se_lun->lun_sep->sep_stats.cmd_pdus++; |
| 1971 | spin_unlock(&cmd->se_lun->lun_sep_lock); |
| 1972 | return 0; |
| 1973 | } |
| 1974 | EXPORT_SYMBOL(transport_generic_allocate_tasks); |
| 1975 | |
| 1976 | /* |
| 1977 | * Used by fabric module frontends not defining a TFO->new_cmd_map() |
| 1978 | * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD statis |
| 1979 | */ |
| 1980 | int transport_generic_handle_cdb( |
| 1981 | struct se_cmd *cmd) |
| 1982 | { |
| 1983 | if (!SE_LUN(cmd)) { |
| 1984 | dump_stack(); |
| 1985 | printk(KERN_ERR "SE_LUN(cmd) is NULL\n"); |
| 1986 | return -1; |
| 1987 | } |
| 1988 | |
| 1989 | transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD); |
| 1990 | return 0; |
| 1991 | } |
| 1992 | EXPORT_SYMBOL(transport_generic_handle_cdb); |
| 1993 | |
| 1994 | /* |
| 1995 | * Used by fabric module frontends defining a TFO->new_cmd_map() caller |
| 1996 | * to queue up a newly setup se_cmd w/ TRANSPORT_NEW_CMD_MAP in order to |
| 1997 | * complete setup in TCM process context w/ TFO->new_cmd_map(). |
| 1998 | */ |
| 1999 | int transport_generic_handle_cdb_map( |
| 2000 | struct se_cmd *cmd) |
| 2001 | { |
| 2002 | if (!SE_LUN(cmd)) { |
| 2003 | dump_stack(); |
| 2004 | printk(KERN_ERR "SE_LUN(cmd) is NULL\n"); |
| 2005 | return -1; |
| 2006 | } |
| 2007 | |
| 2008 | transport_add_cmd_to_queue(cmd, TRANSPORT_NEW_CMD_MAP); |
| 2009 | return 0; |
| 2010 | } |
| 2011 | EXPORT_SYMBOL(transport_generic_handle_cdb_map); |
| 2012 | |
| 2013 | /* transport_generic_handle_data(): |
| 2014 | * |
| 2015 | * |
| 2016 | */ |
| 2017 | int transport_generic_handle_data( |
| 2018 | struct se_cmd *cmd) |
| 2019 | { |
| 2020 | /* |
| 2021 | * For the software fabric case, then we assume the nexus is being |
| 2022 | * failed/shutdown when signals are pending from the kthread context |
| 2023 | * caller, so we return a failure. For the HW target mode case running |
| 2024 | * in interrupt code, the signal_pending() check is skipped. |
| 2025 | */ |
| 2026 | if (!in_interrupt() && signal_pending(current)) |
| 2027 | return -1; |
| 2028 | /* |
| 2029 | * If the received CDB has aleady been ABORTED by the generic |
| 2030 | * target engine, we now call transport_check_aborted_status() |
| 2031 | * to queue any delated TASK_ABORTED status for the received CDB to the |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2032 | * fabric module as we are expecting no further incoming DATA OUT |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2033 | * sequences at this point. |
| 2034 | */ |
| 2035 | if (transport_check_aborted_status(cmd, 1) != 0) |
| 2036 | return 0; |
| 2037 | |
| 2038 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_WRITE); |
| 2039 | return 0; |
| 2040 | } |
| 2041 | EXPORT_SYMBOL(transport_generic_handle_data); |
| 2042 | |
| 2043 | /* transport_generic_handle_tmr(): |
| 2044 | * |
| 2045 | * |
| 2046 | */ |
| 2047 | int transport_generic_handle_tmr( |
| 2048 | struct se_cmd *cmd) |
| 2049 | { |
| 2050 | /* |
| 2051 | * This is needed for early exceptions. |
| 2052 | */ |
| 2053 | cmd->transport_wait_for_tasks = &transport_generic_wait_for_tasks; |
| 2054 | transport_device_setup_cmd(cmd); |
| 2055 | |
| 2056 | transport_add_cmd_to_queue(cmd, TRANSPORT_PROCESS_TMR); |
| 2057 | return 0; |
| 2058 | } |
| 2059 | EXPORT_SYMBOL(transport_generic_handle_tmr); |
| 2060 | |
| 2061 | static int transport_stop_tasks_for_cmd(struct se_cmd *cmd) |
| 2062 | { |
| 2063 | struct se_task *task, *task_tmp; |
| 2064 | unsigned long flags; |
| 2065 | int ret = 0; |
| 2066 | |
| 2067 | DEBUG_TS("ITT[0x%08x] - Stopping tasks\n", |
| 2068 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 2069 | |
| 2070 | /* |
| 2071 | * No tasks remain in the execution queue |
| 2072 | */ |
| 2073 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 2074 | list_for_each_entry_safe(task, task_tmp, |
| 2075 | &T_TASK(cmd)->t_task_list, t_list) { |
| 2076 | DEBUG_TS("task_no[%d] - Processing task %p\n", |
| 2077 | task->task_no, task); |
| 2078 | /* |
| 2079 | * If the struct se_task has not been sent and is not active, |
| 2080 | * remove the struct se_task from the execution queue. |
| 2081 | */ |
| 2082 | if (!atomic_read(&task->task_sent) && |
| 2083 | !atomic_read(&task->task_active)) { |
| 2084 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, |
| 2085 | flags); |
| 2086 | transport_remove_task_from_execute_queue(task, |
| 2087 | task->se_dev); |
| 2088 | |
| 2089 | DEBUG_TS("task_no[%d] - Removed from execute queue\n", |
| 2090 | task->task_no); |
| 2091 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 2092 | continue; |
| 2093 | } |
| 2094 | |
| 2095 | /* |
| 2096 | * If the struct se_task is active, sleep until it is returned |
| 2097 | * from the plugin. |
| 2098 | */ |
| 2099 | if (atomic_read(&task->task_active)) { |
| 2100 | atomic_set(&task->task_stop, 1); |
| 2101 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, |
| 2102 | flags); |
| 2103 | |
| 2104 | DEBUG_TS("task_no[%d] - Waiting to complete\n", |
| 2105 | task->task_no); |
| 2106 | wait_for_completion(&task->task_stop_comp); |
| 2107 | DEBUG_TS("task_no[%d] - Stopped successfully\n", |
| 2108 | task->task_no); |
| 2109 | |
| 2110 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 2111 | atomic_dec(&T_TASK(cmd)->t_task_cdbs_left); |
| 2112 | |
| 2113 | atomic_set(&task->task_active, 0); |
| 2114 | atomic_set(&task->task_stop, 0); |
| 2115 | } else { |
| 2116 | DEBUG_TS("task_no[%d] - Did nothing\n", task->task_no); |
| 2117 | ret++; |
| 2118 | } |
| 2119 | |
| 2120 | __transport_stop_task_timer(task, &flags); |
| 2121 | } |
| 2122 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 2123 | |
| 2124 | return ret; |
| 2125 | } |
| 2126 | |
| 2127 | static void transport_failure_reset_queue_depth(struct se_device *dev) |
| 2128 | { |
| 2129 | unsigned long flags; |
| 2130 | |
Justin P. Mattock | 6eab04a | 2011-04-08 19:49:08 -0700 | [diff] [blame] | 2131 | spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2132 | atomic_inc(&dev->depth_left); |
| 2133 | atomic_inc(&SE_HBA(dev)->left_queue_depth); |
| 2134 | spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags); |
| 2135 | } |
| 2136 | |
| 2137 | /* |
| 2138 | * Handle SAM-esque emulation for generic transport request failures. |
| 2139 | */ |
| 2140 | static void transport_generic_request_failure( |
| 2141 | struct se_cmd *cmd, |
| 2142 | struct se_device *dev, |
| 2143 | int complete, |
| 2144 | int sc) |
| 2145 | { |
| 2146 | DEBUG_GRF("-----[ Storage Engine Exception for cmd: %p ITT: 0x%08x" |
| 2147 | " CDB: 0x%02x\n", cmd, CMD_TFO(cmd)->get_task_tag(cmd), |
| 2148 | T_TASK(cmd)->t_task_cdb[0]); |
| 2149 | DEBUG_GRF("-----[ i_state: %d t_state/def_t_state:" |
| 2150 | " %d/%d transport_error_status: %d\n", |
| 2151 | CMD_TFO(cmd)->get_cmd_state(cmd), |
| 2152 | cmd->t_state, cmd->deferred_t_state, |
| 2153 | cmd->transport_error_status); |
| 2154 | DEBUG_GRF("-----[ t_task_cdbs: %d t_task_cdbs_left: %d" |
| 2155 | " t_task_cdbs_sent: %d t_task_cdbs_ex_left: %d --" |
| 2156 | " t_transport_active: %d t_transport_stop: %d" |
| 2157 | " t_transport_sent: %d\n", T_TASK(cmd)->t_task_cdbs, |
| 2158 | atomic_read(&T_TASK(cmd)->t_task_cdbs_left), |
| 2159 | atomic_read(&T_TASK(cmd)->t_task_cdbs_sent), |
| 2160 | atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left), |
| 2161 | atomic_read(&T_TASK(cmd)->t_transport_active), |
| 2162 | atomic_read(&T_TASK(cmd)->t_transport_stop), |
| 2163 | atomic_read(&T_TASK(cmd)->t_transport_sent)); |
| 2164 | |
| 2165 | transport_stop_all_task_timers(cmd); |
| 2166 | |
| 2167 | if (dev) |
| 2168 | transport_failure_reset_queue_depth(dev); |
| 2169 | /* |
| 2170 | * For SAM Task Attribute emulation for failed struct se_cmd |
| 2171 | */ |
| 2172 | if (cmd->se_dev->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
| 2173 | transport_complete_task_attr(cmd); |
| 2174 | |
| 2175 | if (complete) { |
| 2176 | transport_direct_request_timeout(cmd); |
| 2177 | cmd->transport_error_status = PYX_TRANSPORT_LU_COMM_FAILURE; |
| 2178 | } |
| 2179 | |
| 2180 | switch (cmd->transport_error_status) { |
| 2181 | case PYX_TRANSPORT_UNKNOWN_SAM_OPCODE: |
| 2182 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
| 2183 | break; |
| 2184 | case PYX_TRANSPORT_REQ_TOO_MANY_SECTORS: |
| 2185 | cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY; |
| 2186 | break; |
| 2187 | case PYX_TRANSPORT_INVALID_CDB_FIELD: |
| 2188 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; |
| 2189 | break; |
| 2190 | case PYX_TRANSPORT_INVALID_PARAMETER_LIST: |
| 2191 | cmd->scsi_sense_reason = TCM_INVALID_PARAMETER_LIST; |
| 2192 | break; |
| 2193 | case PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES: |
| 2194 | if (!sc) |
| 2195 | transport_new_cmd_failure(cmd); |
| 2196 | /* |
| 2197 | * Currently for PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES, |
| 2198 | * we force this session to fall back to session |
| 2199 | * recovery. |
| 2200 | */ |
| 2201 | CMD_TFO(cmd)->fall_back_to_erl0(cmd->se_sess); |
| 2202 | CMD_TFO(cmd)->stop_session(cmd->se_sess, 0, 0); |
| 2203 | |
| 2204 | goto check_stop; |
| 2205 | case PYX_TRANSPORT_LU_COMM_FAILURE: |
| 2206 | case PYX_TRANSPORT_ILLEGAL_REQUEST: |
| 2207 | cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 2208 | break; |
| 2209 | case PYX_TRANSPORT_UNKNOWN_MODE_PAGE: |
| 2210 | cmd->scsi_sense_reason = TCM_UNKNOWN_MODE_PAGE; |
| 2211 | break; |
| 2212 | case PYX_TRANSPORT_WRITE_PROTECTED: |
| 2213 | cmd->scsi_sense_reason = TCM_WRITE_PROTECTED; |
| 2214 | break; |
| 2215 | case PYX_TRANSPORT_RESERVATION_CONFLICT: |
| 2216 | /* |
| 2217 | * No SENSE Data payload for this case, set SCSI Status |
| 2218 | * and queue the response to $FABRIC_MOD. |
| 2219 | * |
| 2220 | * Uses linux/include/scsi/scsi.h SAM status codes defs |
| 2221 | */ |
| 2222 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; |
| 2223 | /* |
| 2224 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will |
| 2225 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION |
| 2226 | * CONFLICT STATUS. |
| 2227 | * |
| 2228 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 |
| 2229 | */ |
| 2230 | if (SE_SESS(cmd) && |
| 2231 | DEV_ATTRIB(cmd->se_dev)->emulate_ua_intlck_ctrl == 2) |
| 2232 | core_scsi3_ua_allocate(SE_SESS(cmd)->se_node_acl, |
| 2233 | cmd->orig_fe_lun, 0x2C, |
| 2234 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); |
| 2235 | |
| 2236 | CMD_TFO(cmd)->queue_status(cmd); |
| 2237 | goto check_stop; |
| 2238 | case PYX_TRANSPORT_USE_SENSE_REASON: |
| 2239 | /* |
| 2240 | * struct se_cmd->scsi_sense_reason already set |
| 2241 | */ |
| 2242 | break; |
| 2243 | default: |
| 2244 | printk(KERN_ERR "Unknown transport error for CDB 0x%02x: %d\n", |
| 2245 | T_TASK(cmd)->t_task_cdb[0], |
| 2246 | cmd->transport_error_status); |
| 2247 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
| 2248 | break; |
| 2249 | } |
| 2250 | |
| 2251 | if (!sc) |
| 2252 | transport_new_cmd_failure(cmd); |
| 2253 | else |
| 2254 | transport_send_check_condition_and_sense(cmd, |
| 2255 | cmd->scsi_sense_reason, 0); |
| 2256 | check_stop: |
| 2257 | transport_lun_remove_cmd(cmd); |
| 2258 | if (!(transport_cmd_check_stop_to_fabric(cmd))) |
| 2259 | ; |
| 2260 | } |
| 2261 | |
| 2262 | static void transport_direct_request_timeout(struct se_cmd *cmd) |
| 2263 | { |
| 2264 | unsigned long flags; |
| 2265 | |
| 2266 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 2267 | if (!(atomic_read(&T_TASK(cmd)->t_transport_timeout))) { |
| 2268 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 2269 | return; |
| 2270 | } |
| 2271 | if (atomic_read(&T_TASK(cmd)->t_task_cdbs_timeout_left)) { |
| 2272 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 2273 | return; |
| 2274 | } |
| 2275 | |
| 2276 | atomic_sub(atomic_read(&T_TASK(cmd)->t_transport_timeout), |
| 2277 | &T_TASK(cmd)->t_se_count); |
| 2278 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 2279 | } |
| 2280 | |
| 2281 | static void transport_generic_request_timeout(struct se_cmd *cmd) |
| 2282 | { |
| 2283 | unsigned long flags; |
| 2284 | |
| 2285 | /* |
| 2286 | * Reset T_TASK(cmd)->t_se_count to allow transport_generic_remove() |
| 2287 | * to allow last call to free memory resources. |
| 2288 | */ |
| 2289 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 2290 | if (atomic_read(&T_TASK(cmd)->t_transport_timeout) > 1) { |
| 2291 | int tmp = (atomic_read(&T_TASK(cmd)->t_transport_timeout) - 1); |
| 2292 | |
| 2293 | atomic_sub(tmp, &T_TASK(cmd)->t_se_count); |
| 2294 | } |
| 2295 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 2296 | |
| 2297 | transport_generic_remove(cmd, 0, 0); |
| 2298 | } |
| 2299 | |
| 2300 | static int |
| 2301 | transport_generic_allocate_buf(struct se_cmd *cmd, u32 data_length) |
| 2302 | { |
| 2303 | unsigned char *buf; |
| 2304 | |
| 2305 | buf = kzalloc(data_length, GFP_KERNEL); |
| 2306 | if (!(buf)) { |
| 2307 | printk(KERN_ERR "Unable to allocate memory for buffer\n"); |
| 2308 | return -1; |
| 2309 | } |
| 2310 | |
| 2311 | T_TASK(cmd)->t_tasks_se_num = 0; |
| 2312 | T_TASK(cmd)->t_task_buf = buf; |
| 2313 | |
| 2314 | return 0; |
| 2315 | } |
| 2316 | |
| 2317 | static inline u32 transport_lba_21(unsigned char *cdb) |
| 2318 | { |
| 2319 | return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3]; |
| 2320 | } |
| 2321 | |
| 2322 | static inline u32 transport_lba_32(unsigned char *cdb) |
| 2323 | { |
| 2324 | return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 2325 | } |
| 2326 | |
| 2327 | static inline unsigned long long transport_lba_64(unsigned char *cdb) |
| 2328 | { |
| 2329 | unsigned int __v1, __v2; |
| 2330 | |
| 2331 | __v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5]; |
| 2332 | __v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
| 2333 | |
| 2334 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 2335 | } |
| 2336 | |
| 2337 | /* |
| 2338 | * For VARIABLE_LENGTH_CDB w/ 32 byte extended CDBs |
| 2339 | */ |
| 2340 | static inline unsigned long long transport_lba_64_ext(unsigned char *cdb) |
| 2341 | { |
| 2342 | unsigned int __v1, __v2; |
| 2343 | |
| 2344 | __v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15]; |
| 2345 | __v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19]; |
| 2346 | |
| 2347 | return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32; |
| 2348 | } |
| 2349 | |
| 2350 | static void transport_set_supported_SAM_opcode(struct se_cmd *se_cmd) |
| 2351 | { |
| 2352 | unsigned long flags; |
| 2353 | |
| 2354 | spin_lock_irqsave(&T_TASK(se_cmd)->t_state_lock, flags); |
| 2355 | se_cmd->se_cmd_flags |= SCF_SUPPORTED_SAM_OPCODE; |
| 2356 | spin_unlock_irqrestore(&T_TASK(se_cmd)->t_state_lock, flags); |
| 2357 | } |
| 2358 | |
| 2359 | /* |
| 2360 | * Called from interrupt context. |
| 2361 | */ |
| 2362 | static void transport_task_timeout_handler(unsigned long data) |
| 2363 | { |
| 2364 | struct se_task *task = (struct se_task *)data; |
| 2365 | struct se_cmd *cmd = TASK_CMD(task); |
| 2366 | unsigned long flags; |
| 2367 | |
| 2368 | DEBUG_TT("transport task timeout fired! task: %p cmd: %p\n", task, cmd); |
| 2369 | |
| 2370 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 2371 | if (task->task_flags & TF_STOP) { |
| 2372 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 2373 | return; |
| 2374 | } |
| 2375 | task->task_flags &= ~TF_RUNNING; |
| 2376 | |
| 2377 | /* |
| 2378 | * Determine if transport_complete_task() has already been called. |
| 2379 | */ |
| 2380 | if (!(atomic_read(&task->task_active))) { |
| 2381 | DEBUG_TT("transport task: %p cmd: %p timeout task_active" |
| 2382 | " == 0\n", task, cmd); |
| 2383 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 2384 | return; |
| 2385 | } |
| 2386 | |
| 2387 | atomic_inc(&T_TASK(cmd)->t_se_count); |
| 2388 | atomic_inc(&T_TASK(cmd)->t_transport_timeout); |
| 2389 | T_TASK(cmd)->t_tasks_failed = 1; |
| 2390 | |
| 2391 | atomic_set(&task->task_timeout, 1); |
| 2392 | task->task_error_status = PYX_TRANSPORT_TASK_TIMEOUT; |
| 2393 | task->task_scsi_status = 1; |
| 2394 | |
| 2395 | if (atomic_read(&task->task_stop)) { |
| 2396 | DEBUG_TT("transport task: %p cmd: %p timeout task_stop" |
| 2397 | " == 1\n", task, cmd); |
| 2398 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 2399 | complete(&task->task_stop_comp); |
| 2400 | return; |
| 2401 | } |
| 2402 | |
| 2403 | if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_left))) { |
| 2404 | DEBUG_TT("transport task: %p cmd: %p timeout non zero" |
| 2405 | " t_task_cdbs_left\n", task, cmd); |
| 2406 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 2407 | return; |
| 2408 | } |
| 2409 | DEBUG_TT("transport task: %p cmd: %p timeout ZERO t_task_cdbs_left\n", |
| 2410 | task, cmd); |
| 2411 | |
| 2412 | cmd->t_state = TRANSPORT_COMPLETE_FAILURE; |
| 2413 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 2414 | |
| 2415 | transport_add_cmd_to_queue(cmd, TRANSPORT_COMPLETE_FAILURE); |
| 2416 | } |
| 2417 | |
| 2418 | /* |
| 2419 | * Called with T_TASK(cmd)->t_state_lock held. |
| 2420 | */ |
| 2421 | static void transport_start_task_timer(struct se_task *task) |
| 2422 | { |
| 2423 | struct se_device *dev = task->se_dev; |
| 2424 | int timeout; |
| 2425 | |
| 2426 | if (task->task_flags & TF_RUNNING) |
| 2427 | return; |
| 2428 | /* |
| 2429 | * If the task_timeout is disabled, exit now. |
| 2430 | */ |
| 2431 | timeout = DEV_ATTRIB(dev)->task_timeout; |
| 2432 | if (!(timeout)) |
| 2433 | return; |
| 2434 | |
| 2435 | init_timer(&task->task_timer); |
| 2436 | task->task_timer.expires = (get_jiffies_64() + timeout * HZ); |
| 2437 | task->task_timer.data = (unsigned long) task; |
| 2438 | task->task_timer.function = transport_task_timeout_handler; |
| 2439 | |
| 2440 | task->task_flags |= TF_RUNNING; |
| 2441 | add_timer(&task->task_timer); |
| 2442 | #if 0 |
| 2443 | printk(KERN_INFO "Starting task timer for cmd: %p task: %p seconds:" |
| 2444 | " %d\n", task->task_se_cmd, task, timeout); |
| 2445 | #endif |
| 2446 | } |
| 2447 | |
| 2448 | /* |
| 2449 | * Called with spin_lock_irq(&T_TASK(cmd)->t_state_lock) held. |
| 2450 | */ |
| 2451 | void __transport_stop_task_timer(struct se_task *task, unsigned long *flags) |
| 2452 | { |
| 2453 | struct se_cmd *cmd = TASK_CMD(task); |
| 2454 | |
| 2455 | if (!(task->task_flags & TF_RUNNING)) |
| 2456 | return; |
| 2457 | |
| 2458 | task->task_flags |= TF_STOP; |
| 2459 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, *flags); |
| 2460 | |
| 2461 | del_timer_sync(&task->task_timer); |
| 2462 | |
| 2463 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, *flags); |
| 2464 | task->task_flags &= ~TF_RUNNING; |
| 2465 | task->task_flags &= ~TF_STOP; |
| 2466 | } |
| 2467 | |
| 2468 | static void transport_stop_all_task_timers(struct se_cmd *cmd) |
| 2469 | { |
| 2470 | struct se_task *task = NULL, *task_tmp; |
| 2471 | unsigned long flags; |
| 2472 | |
| 2473 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 2474 | list_for_each_entry_safe(task, task_tmp, |
| 2475 | &T_TASK(cmd)->t_task_list, t_list) |
| 2476 | __transport_stop_task_timer(task, &flags); |
| 2477 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 2478 | } |
| 2479 | |
| 2480 | static inline int transport_tcq_window_closed(struct se_device *dev) |
| 2481 | { |
| 2482 | if (dev->dev_tcq_window_closed++ < |
| 2483 | PYX_TRANSPORT_WINDOW_CLOSED_THRESHOLD) { |
| 2484 | msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_SHORT); |
| 2485 | } else |
| 2486 | msleep(PYX_TRANSPORT_WINDOW_CLOSED_WAIT_LONG); |
| 2487 | |
| 2488 | wake_up_interruptible(&dev->dev_queue_obj->thread_wq); |
| 2489 | return 0; |
| 2490 | } |
| 2491 | |
| 2492 | /* |
| 2493 | * Called from Fabric Module context from transport_execute_tasks() |
| 2494 | * |
| 2495 | * The return of this function determins if the tasks from struct se_cmd |
| 2496 | * get added to the execution queue in transport_execute_tasks(), |
| 2497 | * or are added to the delayed or ordered lists here. |
| 2498 | */ |
| 2499 | static inline int transport_execute_task_attr(struct se_cmd *cmd) |
| 2500 | { |
| 2501 | if (SE_DEV(cmd)->dev_task_attr_type != SAM_TASK_ATTR_EMULATED) |
| 2502 | return 1; |
| 2503 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2504 | * Check for the existence of HEAD_OF_QUEUE, and if true return 1 |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2505 | * to allow the passed struct se_cmd list of tasks to the front of the list. |
| 2506 | */ |
| 2507 | if (cmd->sam_task_attr == TASK_ATTR_HOQ) { |
| 2508 | atomic_inc(&SE_DEV(cmd)->dev_hoq_count); |
| 2509 | smp_mb__after_atomic_inc(); |
| 2510 | DEBUG_STA("Added HEAD_OF_QUEUE for CDB:" |
| 2511 | " 0x%02x, se_ordered_id: %u\n", |
| 2512 | T_TASK(cmd)->t_task_cdb[0], |
| 2513 | cmd->se_ordered_id); |
| 2514 | return 1; |
| 2515 | } else if (cmd->sam_task_attr == TASK_ATTR_ORDERED) { |
| 2516 | spin_lock(&SE_DEV(cmd)->ordered_cmd_lock); |
| 2517 | list_add_tail(&cmd->se_ordered_list, |
| 2518 | &SE_DEV(cmd)->ordered_cmd_list); |
| 2519 | spin_unlock(&SE_DEV(cmd)->ordered_cmd_lock); |
| 2520 | |
| 2521 | atomic_inc(&SE_DEV(cmd)->dev_ordered_sync); |
| 2522 | smp_mb__after_atomic_inc(); |
| 2523 | |
| 2524 | DEBUG_STA("Added ORDERED for CDB: 0x%02x to ordered" |
| 2525 | " list, se_ordered_id: %u\n", |
| 2526 | T_TASK(cmd)->t_task_cdb[0], |
| 2527 | cmd->se_ordered_id); |
| 2528 | /* |
| 2529 | * Add ORDERED command to tail of execution queue if |
| 2530 | * no other older commands exist that need to be |
| 2531 | * completed first. |
| 2532 | */ |
| 2533 | if (!(atomic_read(&SE_DEV(cmd)->simple_cmds))) |
| 2534 | return 1; |
| 2535 | } else { |
| 2536 | /* |
| 2537 | * For SIMPLE and UNTAGGED Task Attribute commands |
| 2538 | */ |
| 2539 | atomic_inc(&SE_DEV(cmd)->simple_cmds); |
| 2540 | smp_mb__after_atomic_inc(); |
| 2541 | } |
| 2542 | /* |
| 2543 | * Otherwise if one or more outstanding ORDERED task attribute exist, |
| 2544 | * add the dormant task(s) built for the passed struct se_cmd to the |
| 2545 | * execution queue and become in Active state for this struct se_device. |
| 2546 | */ |
| 2547 | if (atomic_read(&SE_DEV(cmd)->dev_ordered_sync) != 0) { |
| 2548 | /* |
| 2549 | * Otherwise, add cmd w/ tasks to delayed cmd queue that |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2550 | * will be drained upon completion of HEAD_OF_QUEUE task. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2551 | */ |
| 2552 | spin_lock(&SE_DEV(cmd)->delayed_cmd_lock); |
| 2553 | cmd->se_cmd_flags |= SCF_DELAYED_CMD_FROM_SAM_ATTR; |
| 2554 | list_add_tail(&cmd->se_delayed_list, |
| 2555 | &SE_DEV(cmd)->delayed_cmd_list); |
| 2556 | spin_unlock(&SE_DEV(cmd)->delayed_cmd_lock); |
| 2557 | |
| 2558 | DEBUG_STA("Added CDB: 0x%02x Task Attr: 0x%02x to" |
| 2559 | " delayed CMD list, se_ordered_id: %u\n", |
| 2560 | T_TASK(cmd)->t_task_cdb[0], cmd->sam_task_attr, |
| 2561 | cmd->se_ordered_id); |
| 2562 | /* |
| 2563 | * Return zero to let transport_execute_tasks() know |
| 2564 | * not to add the delayed tasks to the execution list. |
| 2565 | */ |
| 2566 | return 0; |
| 2567 | } |
| 2568 | /* |
| 2569 | * Otherwise, no ORDERED task attributes exist.. |
| 2570 | */ |
| 2571 | return 1; |
| 2572 | } |
| 2573 | |
| 2574 | /* |
| 2575 | * Called from fabric module context in transport_generic_new_cmd() and |
| 2576 | * transport_generic_process_write() |
| 2577 | */ |
| 2578 | static int transport_execute_tasks(struct se_cmd *cmd) |
| 2579 | { |
| 2580 | int add_tasks; |
| 2581 | |
| 2582 | if (!(cmd->se_cmd_flags & SCF_SE_DISABLE_ONLINE_CHECK)) { |
| 2583 | if (se_dev_check_online(cmd->se_orig_obj_ptr) != 0) { |
| 2584 | cmd->transport_error_status = |
| 2585 | PYX_TRANSPORT_LU_COMM_FAILURE; |
| 2586 | transport_generic_request_failure(cmd, NULL, 0, 1); |
| 2587 | return 0; |
| 2588 | } |
| 2589 | } |
| 2590 | /* |
| 2591 | * Call transport_cmd_check_stop() to see if a fabric exception |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 2592 | * has occurred that prevents execution. |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 2593 | */ |
| 2594 | if (!(transport_cmd_check_stop(cmd, 0, TRANSPORT_PROCESSING))) { |
| 2595 | /* |
| 2596 | * Check for SAM Task Attribute emulation and HEAD_OF_QUEUE |
| 2597 | * attribute for the tasks of the received struct se_cmd CDB |
| 2598 | */ |
| 2599 | add_tasks = transport_execute_task_attr(cmd); |
| 2600 | if (add_tasks == 0) |
| 2601 | goto execute_tasks; |
| 2602 | /* |
| 2603 | * This calls transport_add_tasks_from_cmd() to handle |
| 2604 | * HEAD_OF_QUEUE ordering for SAM Task Attribute emulation |
| 2605 | * (if enabled) in __transport_add_task_to_execute_queue() and |
| 2606 | * transport_add_task_check_sam_attr(). |
| 2607 | */ |
| 2608 | transport_add_tasks_from_cmd(cmd); |
| 2609 | } |
| 2610 | /* |
| 2611 | * Kick the execution queue for the cmd associated struct se_device |
| 2612 | * storage object. |
| 2613 | */ |
| 2614 | execute_tasks: |
| 2615 | __transport_execute_tasks(SE_DEV(cmd)); |
| 2616 | return 0; |
| 2617 | } |
| 2618 | |
| 2619 | /* |
| 2620 | * Called to check struct se_device tcq depth window, and once open pull struct se_task |
| 2621 | * from struct se_device->execute_task_list and |
| 2622 | * |
| 2623 | * Called from transport_processing_thread() |
| 2624 | */ |
| 2625 | static int __transport_execute_tasks(struct se_device *dev) |
| 2626 | { |
| 2627 | int error; |
| 2628 | struct se_cmd *cmd = NULL; |
| 2629 | struct se_task *task; |
| 2630 | unsigned long flags; |
| 2631 | |
| 2632 | /* |
| 2633 | * Check if there is enough room in the device and HBA queue to send |
| 2634 | * struct se_transport_task's to the selected transport. |
| 2635 | */ |
| 2636 | check_depth: |
| 2637 | spin_lock_irqsave(&SE_HBA(dev)->hba_queue_lock, flags); |
| 2638 | if (!(atomic_read(&dev->depth_left)) || |
| 2639 | !(atomic_read(&SE_HBA(dev)->left_queue_depth))) { |
| 2640 | spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags); |
| 2641 | return transport_tcq_window_closed(dev); |
| 2642 | } |
| 2643 | dev->dev_tcq_window_closed = 0; |
| 2644 | |
| 2645 | spin_lock(&dev->execute_task_lock); |
| 2646 | task = transport_get_task_from_execute_queue(dev); |
| 2647 | spin_unlock(&dev->execute_task_lock); |
| 2648 | |
| 2649 | if (!task) { |
| 2650 | spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags); |
| 2651 | return 0; |
| 2652 | } |
| 2653 | |
| 2654 | atomic_dec(&dev->depth_left); |
| 2655 | atomic_dec(&SE_HBA(dev)->left_queue_depth); |
| 2656 | spin_unlock_irqrestore(&SE_HBA(dev)->hba_queue_lock, flags); |
| 2657 | |
| 2658 | cmd = TASK_CMD(task); |
| 2659 | |
| 2660 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 2661 | atomic_set(&task->task_active, 1); |
| 2662 | atomic_set(&task->task_sent, 1); |
| 2663 | atomic_inc(&T_TASK(cmd)->t_task_cdbs_sent); |
| 2664 | |
| 2665 | if (atomic_read(&T_TASK(cmd)->t_task_cdbs_sent) == |
| 2666 | T_TASK(cmd)->t_task_cdbs) |
| 2667 | atomic_set(&cmd->transport_sent, 1); |
| 2668 | |
| 2669 | transport_start_task_timer(task); |
| 2670 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 2671 | /* |
| 2672 | * The struct se_cmd->transport_emulate_cdb() function pointer is used |
| 2673 | * to grab REPORT_LUNS CDBs before they hit the |
| 2674 | * struct se_subsystem_api->do_task() caller below. |
| 2675 | */ |
| 2676 | if (cmd->transport_emulate_cdb) { |
| 2677 | error = cmd->transport_emulate_cdb(cmd); |
| 2678 | if (error != 0) { |
| 2679 | cmd->transport_error_status = error; |
| 2680 | atomic_set(&task->task_active, 0); |
| 2681 | atomic_set(&cmd->transport_sent, 0); |
| 2682 | transport_stop_tasks_for_cmd(cmd); |
| 2683 | transport_generic_request_failure(cmd, dev, 0, 1); |
| 2684 | goto check_depth; |
| 2685 | } |
| 2686 | /* |
| 2687 | * Handle the successful completion for transport_emulate_cdb() |
| 2688 | * for synchronous operation, following SCF_EMULATE_CDB_ASYNC |
| 2689 | * Otherwise the caller is expected to complete the task with |
| 2690 | * proper status. |
| 2691 | */ |
| 2692 | if (!(cmd->se_cmd_flags & SCF_EMULATE_CDB_ASYNC)) { |
| 2693 | cmd->scsi_status = SAM_STAT_GOOD; |
| 2694 | task->task_scsi_status = GOOD; |
| 2695 | transport_complete_task(task, 1); |
| 2696 | } |
| 2697 | } else { |
| 2698 | /* |
| 2699 | * Currently for all virtual TCM plugins including IBLOCK, FILEIO and |
| 2700 | * RAMDISK we use the internal transport_emulate_control_cdb() logic |
| 2701 | * with struct se_subsystem_api callers for the primary SPC-3 TYPE_DISK |
| 2702 | * LUN emulation code. |
| 2703 | * |
| 2704 | * For TCM/pSCSI and all other SCF_SCSI_DATA_SG_IO_CDB I/O tasks we |
| 2705 | * call ->do_task() directly and let the underlying TCM subsystem plugin |
| 2706 | * code handle the CDB emulation. |
| 2707 | */ |
| 2708 | if ((TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV) && |
| 2709 | (!(TASK_CMD(task)->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB))) |
| 2710 | error = transport_emulate_control_cdb(task); |
| 2711 | else |
| 2712 | error = TRANSPORT(dev)->do_task(task); |
| 2713 | |
| 2714 | if (error != 0) { |
| 2715 | cmd->transport_error_status = error; |
| 2716 | atomic_set(&task->task_active, 0); |
| 2717 | atomic_set(&cmd->transport_sent, 0); |
| 2718 | transport_stop_tasks_for_cmd(cmd); |
| 2719 | transport_generic_request_failure(cmd, dev, 0, 1); |
| 2720 | } |
| 2721 | } |
| 2722 | |
| 2723 | goto check_depth; |
| 2724 | |
| 2725 | return 0; |
| 2726 | } |
| 2727 | |
| 2728 | void transport_new_cmd_failure(struct se_cmd *se_cmd) |
| 2729 | { |
| 2730 | unsigned long flags; |
| 2731 | /* |
| 2732 | * Any unsolicited data will get dumped for failed command inside of |
| 2733 | * the fabric plugin |
| 2734 | */ |
| 2735 | spin_lock_irqsave(&T_TASK(se_cmd)->t_state_lock, flags); |
| 2736 | se_cmd->se_cmd_flags |= SCF_SE_CMD_FAILED; |
| 2737 | se_cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 2738 | spin_unlock_irqrestore(&T_TASK(se_cmd)->t_state_lock, flags); |
| 2739 | |
| 2740 | CMD_TFO(se_cmd)->new_cmd_failure(se_cmd); |
| 2741 | } |
| 2742 | |
| 2743 | static void transport_nop_wait_for_tasks(struct se_cmd *, int, int); |
| 2744 | |
| 2745 | static inline u32 transport_get_sectors_6( |
| 2746 | unsigned char *cdb, |
| 2747 | struct se_cmd *cmd, |
| 2748 | int *ret) |
| 2749 | { |
| 2750 | struct se_device *dev = SE_LUN(cmd)->lun_se_dev; |
| 2751 | |
| 2752 | /* |
| 2753 | * Assume TYPE_DISK for non struct se_device objects. |
| 2754 | * Use 8-bit sector value. |
| 2755 | */ |
| 2756 | if (!dev) |
| 2757 | goto type_disk; |
| 2758 | |
| 2759 | /* |
| 2760 | * Use 24-bit allocation length for TYPE_TAPE. |
| 2761 | */ |
| 2762 | if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) |
| 2763 | return (u32)(cdb[2] << 16) + (cdb[3] << 8) + cdb[4]; |
| 2764 | |
| 2765 | /* |
| 2766 | * Everything else assume TYPE_DISK Sector CDB location. |
| 2767 | * Use 8-bit sector value. |
| 2768 | */ |
| 2769 | type_disk: |
| 2770 | return (u32)cdb[4]; |
| 2771 | } |
| 2772 | |
| 2773 | static inline u32 transport_get_sectors_10( |
| 2774 | unsigned char *cdb, |
| 2775 | struct se_cmd *cmd, |
| 2776 | int *ret) |
| 2777 | { |
| 2778 | struct se_device *dev = SE_LUN(cmd)->lun_se_dev; |
| 2779 | |
| 2780 | /* |
| 2781 | * Assume TYPE_DISK for non struct se_device objects. |
| 2782 | * Use 16-bit sector value. |
| 2783 | */ |
| 2784 | if (!dev) |
| 2785 | goto type_disk; |
| 2786 | |
| 2787 | /* |
| 2788 | * XXX_10 is not defined in SSC, throw an exception |
| 2789 | */ |
| 2790 | if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) { |
| 2791 | *ret = -1; |
| 2792 | return 0; |
| 2793 | } |
| 2794 | |
| 2795 | /* |
| 2796 | * Everything else assume TYPE_DISK Sector CDB location. |
| 2797 | * Use 16-bit sector value. |
| 2798 | */ |
| 2799 | type_disk: |
| 2800 | return (u32)(cdb[7] << 8) + cdb[8]; |
| 2801 | } |
| 2802 | |
| 2803 | static inline u32 transport_get_sectors_12( |
| 2804 | unsigned char *cdb, |
| 2805 | struct se_cmd *cmd, |
| 2806 | int *ret) |
| 2807 | { |
| 2808 | struct se_device *dev = SE_LUN(cmd)->lun_se_dev; |
| 2809 | |
| 2810 | /* |
| 2811 | * Assume TYPE_DISK for non struct se_device objects. |
| 2812 | * Use 32-bit sector value. |
| 2813 | */ |
| 2814 | if (!dev) |
| 2815 | goto type_disk; |
| 2816 | |
| 2817 | /* |
| 2818 | * XXX_12 is not defined in SSC, throw an exception |
| 2819 | */ |
| 2820 | if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) { |
| 2821 | *ret = -1; |
| 2822 | return 0; |
| 2823 | } |
| 2824 | |
| 2825 | /* |
| 2826 | * Everything else assume TYPE_DISK Sector CDB location. |
| 2827 | * Use 32-bit sector value. |
| 2828 | */ |
| 2829 | type_disk: |
| 2830 | return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9]; |
| 2831 | } |
| 2832 | |
| 2833 | static inline u32 transport_get_sectors_16( |
| 2834 | unsigned char *cdb, |
| 2835 | struct se_cmd *cmd, |
| 2836 | int *ret) |
| 2837 | { |
| 2838 | struct se_device *dev = SE_LUN(cmd)->lun_se_dev; |
| 2839 | |
| 2840 | /* |
| 2841 | * Assume TYPE_DISK for non struct se_device objects. |
| 2842 | * Use 32-bit sector value. |
| 2843 | */ |
| 2844 | if (!dev) |
| 2845 | goto type_disk; |
| 2846 | |
| 2847 | /* |
| 2848 | * Use 24-bit allocation length for TYPE_TAPE. |
| 2849 | */ |
| 2850 | if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) |
| 2851 | return (u32)(cdb[12] << 16) + (cdb[13] << 8) + cdb[14]; |
| 2852 | |
| 2853 | type_disk: |
| 2854 | return (u32)(cdb[10] << 24) + (cdb[11] << 16) + |
| 2855 | (cdb[12] << 8) + cdb[13]; |
| 2856 | } |
| 2857 | |
| 2858 | /* |
| 2859 | * Used for VARIABLE_LENGTH_CDB WRITE_32 and READ_32 variants |
| 2860 | */ |
| 2861 | static inline u32 transport_get_sectors_32( |
| 2862 | unsigned char *cdb, |
| 2863 | struct se_cmd *cmd, |
| 2864 | int *ret) |
| 2865 | { |
| 2866 | /* |
| 2867 | * Assume TYPE_DISK for non struct se_device objects. |
| 2868 | * Use 32-bit sector value. |
| 2869 | */ |
| 2870 | return (u32)(cdb[28] << 24) + (cdb[29] << 16) + |
| 2871 | (cdb[30] << 8) + cdb[31]; |
| 2872 | |
| 2873 | } |
| 2874 | |
| 2875 | static inline u32 transport_get_size( |
| 2876 | u32 sectors, |
| 2877 | unsigned char *cdb, |
| 2878 | struct se_cmd *cmd) |
| 2879 | { |
| 2880 | struct se_device *dev = SE_DEV(cmd); |
| 2881 | |
| 2882 | if (TRANSPORT(dev)->get_device_type(dev) == TYPE_TAPE) { |
| 2883 | if (cdb[1] & 1) { /* sectors */ |
| 2884 | return DEV_ATTRIB(dev)->block_size * sectors; |
| 2885 | } else /* bytes */ |
| 2886 | return sectors; |
| 2887 | } |
| 2888 | #if 0 |
| 2889 | printk(KERN_INFO "Returning block_size: %u, sectors: %u == %u for" |
| 2890 | " %s object\n", DEV_ATTRIB(dev)->block_size, sectors, |
| 2891 | DEV_ATTRIB(dev)->block_size * sectors, |
| 2892 | TRANSPORT(dev)->name); |
| 2893 | #endif |
| 2894 | return DEV_ATTRIB(dev)->block_size * sectors; |
| 2895 | } |
| 2896 | |
| 2897 | unsigned char transport_asciihex_to_binaryhex(unsigned char val[2]) |
| 2898 | { |
| 2899 | unsigned char result = 0; |
| 2900 | /* |
| 2901 | * MSB |
| 2902 | */ |
| 2903 | if ((val[0] >= 'a') && (val[0] <= 'f')) |
| 2904 | result = ((val[0] - 'a' + 10) & 0xf) << 4; |
| 2905 | else |
| 2906 | if ((val[0] >= 'A') && (val[0] <= 'F')) |
| 2907 | result = ((val[0] - 'A' + 10) & 0xf) << 4; |
| 2908 | else /* digit */ |
| 2909 | result = ((val[0] - '0') & 0xf) << 4; |
| 2910 | /* |
| 2911 | * LSB |
| 2912 | */ |
| 2913 | if ((val[1] >= 'a') && (val[1] <= 'f')) |
| 2914 | result |= ((val[1] - 'a' + 10) & 0xf); |
| 2915 | else |
| 2916 | if ((val[1] >= 'A') && (val[1] <= 'F')) |
| 2917 | result |= ((val[1] - 'A' + 10) & 0xf); |
| 2918 | else /* digit */ |
| 2919 | result |= ((val[1] - '0') & 0xf); |
| 2920 | |
| 2921 | return result; |
| 2922 | } |
| 2923 | EXPORT_SYMBOL(transport_asciihex_to_binaryhex); |
| 2924 | |
| 2925 | static void transport_xor_callback(struct se_cmd *cmd) |
| 2926 | { |
| 2927 | unsigned char *buf, *addr; |
| 2928 | struct se_mem *se_mem; |
| 2929 | unsigned int offset; |
| 2930 | int i; |
| 2931 | /* |
| 2932 | * From sbc3r22.pdf section 5.48 XDWRITEREAD (10) command |
| 2933 | * |
| 2934 | * 1) read the specified logical block(s); |
| 2935 | * 2) transfer logical blocks from the data-out buffer; |
| 2936 | * 3) XOR the logical blocks transferred from the data-out buffer with |
| 2937 | * the logical blocks read, storing the resulting XOR data in a buffer; |
| 2938 | * 4) if the DISABLE WRITE bit is set to zero, then write the logical |
| 2939 | * blocks transferred from the data-out buffer; and |
| 2940 | * 5) transfer the resulting XOR data to the data-in buffer. |
| 2941 | */ |
| 2942 | buf = kmalloc(cmd->data_length, GFP_KERNEL); |
| 2943 | if (!(buf)) { |
| 2944 | printk(KERN_ERR "Unable to allocate xor_callback buf\n"); |
| 2945 | return; |
| 2946 | } |
| 2947 | /* |
| 2948 | * Copy the scatterlist WRITE buffer located at T_TASK(cmd)->t_mem_list |
| 2949 | * into the locally allocated *buf |
| 2950 | */ |
| 2951 | transport_memcpy_se_mem_read_contig(cmd, buf, T_TASK(cmd)->t_mem_list); |
| 2952 | /* |
| 2953 | * Now perform the XOR against the BIDI read memory located at |
| 2954 | * T_TASK(cmd)->t_mem_bidi_list |
| 2955 | */ |
| 2956 | |
| 2957 | offset = 0; |
| 2958 | list_for_each_entry(se_mem, T_TASK(cmd)->t_mem_bidi_list, se_list) { |
| 2959 | addr = (unsigned char *)kmap_atomic(se_mem->se_page, KM_USER0); |
| 2960 | if (!(addr)) |
| 2961 | goto out; |
| 2962 | |
| 2963 | for (i = 0; i < se_mem->se_len; i++) |
| 2964 | *(addr + se_mem->se_off + i) ^= *(buf + offset + i); |
| 2965 | |
| 2966 | offset += se_mem->se_len; |
| 2967 | kunmap_atomic(addr, KM_USER0); |
| 2968 | } |
| 2969 | out: |
| 2970 | kfree(buf); |
| 2971 | } |
| 2972 | |
| 2973 | /* |
| 2974 | * Used to obtain Sense Data from underlying Linux/SCSI struct scsi_cmnd |
| 2975 | */ |
| 2976 | static int transport_get_sense_data(struct se_cmd *cmd) |
| 2977 | { |
| 2978 | unsigned char *buffer = cmd->sense_buffer, *sense_buffer = NULL; |
| 2979 | struct se_device *dev; |
| 2980 | struct se_task *task = NULL, *task_tmp; |
| 2981 | unsigned long flags; |
| 2982 | u32 offset = 0; |
| 2983 | |
| 2984 | if (!SE_LUN(cmd)) { |
| 2985 | printk(KERN_ERR "SE_LUN(cmd) is NULL\n"); |
| 2986 | return -1; |
| 2987 | } |
| 2988 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 2989 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
| 2990 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 2991 | return 0; |
| 2992 | } |
| 2993 | |
| 2994 | list_for_each_entry_safe(task, task_tmp, |
| 2995 | &T_TASK(cmd)->t_task_list, t_list) { |
| 2996 | |
| 2997 | if (!task->task_sense) |
| 2998 | continue; |
| 2999 | |
| 3000 | dev = task->se_dev; |
| 3001 | if (!(dev)) |
| 3002 | continue; |
| 3003 | |
| 3004 | if (!TRANSPORT(dev)->get_sense_buffer) { |
| 3005 | printk(KERN_ERR "TRANSPORT(dev)->get_sense_buffer" |
| 3006 | " is NULL\n"); |
| 3007 | continue; |
| 3008 | } |
| 3009 | |
| 3010 | sense_buffer = TRANSPORT(dev)->get_sense_buffer(task); |
| 3011 | if (!(sense_buffer)) { |
| 3012 | printk(KERN_ERR "ITT[0x%08x]_TASK[%d]: Unable to locate" |
| 3013 | " sense buffer for task with sense\n", |
| 3014 | CMD_TFO(cmd)->get_task_tag(cmd), task->task_no); |
| 3015 | continue; |
| 3016 | } |
| 3017 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 3018 | |
| 3019 | offset = CMD_TFO(cmd)->set_fabric_sense_len(cmd, |
| 3020 | TRANSPORT_SENSE_BUFFER); |
| 3021 | |
| 3022 | memcpy((void *)&buffer[offset], (void *)sense_buffer, |
| 3023 | TRANSPORT_SENSE_BUFFER); |
| 3024 | cmd->scsi_status = task->task_scsi_status; |
| 3025 | /* Automatically padded */ |
| 3026 | cmd->scsi_sense_length = |
| 3027 | (TRANSPORT_SENSE_BUFFER + offset); |
| 3028 | |
| 3029 | printk(KERN_INFO "HBA_[%u]_PLUG[%s]: Set SAM STATUS: 0x%02x" |
| 3030 | " and sense\n", |
| 3031 | dev->se_hba->hba_id, TRANSPORT(dev)->name, |
| 3032 | cmd->scsi_status); |
| 3033 | return 0; |
| 3034 | } |
| 3035 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 3036 | |
| 3037 | return -1; |
| 3038 | } |
| 3039 | |
| 3040 | static int transport_allocate_resources(struct se_cmd *cmd) |
| 3041 | { |
| 3042 | u32 length = cmd->data_length; |
| 3043 | |
| 3044 | if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) || |
| 3045 | (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) |
| 3046 | return transport_generic_get_mem(cmd, length, PAGE_SIZE); |
| 3047 | else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) |
| 3048 | return transport_generic_allocate_buf(cmd, length); |
| 3049 | else |
| 3050 | return 0; |
| 3051 | } |
| 3052 | |
| 3053 | static int |
| 3054 | transport_handle_reservation_conflict(struct se_cmd *cmd) |
| 3055 | { |
| 3056 | cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks; |
| 3057 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 3058 | cmd->se_cmd_flags |= SCF_SCSI_RESERVATION_CONFLICT; |
| 3059 | cmd->scsi_status = SAM_STAT_RESERVATION_CONFLICT; |
| 3060 | /* |
| 3061 | * For UA Interlock Code 11b, a RESERVATION CONFLICT will |
| 3062 | * establish a UNIT ATTENTION with PREVIOUS RESERVATION |
| 3063 | * CONFLICT STATUS. |
| 3064 | * |
| 3065 | * See spc4r17, section 7.4.6 Control Mode Page, Table 349 |
| 3066 | */ |
| 3067 | if (SE_SESS(cmd) && |
| 3068 | DEV_ATTRIB(cmd->se_dev)->emulate_ua_intlck_ctrl == 2) |
| 3069 | core_scsi3_ua_allocate(SE_SESS(cmd)->se_node_acl, |
| 3070 | cmd->orig_fe_lun, 0x2C, |
| 3071 | ASCQ_2CH_PREVIOUS_RESERVATION_CONFLICT_STATUS); |
| 3072 | return -2; |
| 3073 | } |
| 3074 | |
| 3075 | /* transport_generic_cmd_sequencer(): |
| 3076 | * |
| 3077 | * Generic Command Sequencer that should work for most DAS transport |
| 3078 | * drivers. |
| 3079 | * |
| 3080 | * Called from transport_generic_allocate_tasks() in the $FABRIC_MOD |
| 3081 | * RX Thread. |
| 3082 | * |
| 3083 | * FIXME: Need to support other SCSI OPCODES where as well. |
| 3084 | */ |
| 3085 | static int transport_generic_cmd_sequencer( |
| 3086 | struct se_cmd *cmd, |
| 3087 | unsigned char *cdb) |
| 3088 | { |
| 3089 | struct se_device *dev = SE_DEV(cmd); |
| 3090 | struct se_subsystem_dev *su_dev = dev->se_sub_dev; |
| 3091 | int ret = 0, sector_ret = 0, passthrough; |
| 3092 | u32 sectors = 0, size = 0, pr_reg_type = 0; |
| 3093 | u16 service_action; |
| 3094 | u8 alua_ascq = 0; |
| 3095 | /* |
| 3096 | * Check for an existing UNIT ATTENTION condition |
| 3097 | */ |
| 3098 | if (core_scsi3_ua_check(cmd, cdb) < 0) { |
| 3099 | cmd->transport_wait_for_tasks = |
| 3100 | &transport_nop_wait_for_tasks; |
| 3101 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 3102 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_UNIT_ATTENTION; |
| 3103 | return -2; |
| 3104 | } |
| 3105 | /* |
| 3106 | * Check status of Asymmetric Logical Unit Assignment port |
| 3107 | */ |
| 3108 | ret = T10_ALUA(su_dev)->alua_state_check(cmd, cdb, &alua_ascq); |
| 3109 | if (ret != 0) { |
| 3110 | cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks; |
| 3111 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3112 | * Set SCSI additional sense code (ASC) to 'LUN Not Accessible'; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3113 | * The ALUA additional sense code qualifier (ASCQ) is determined |
| 3114 | * by the ALUA primary or secondary access state.. |
| 3115 | */ |
| 3116 | if (ret > 0) { |
| 3117 | #if 0 |
| 3118 | printk(KERN_INFO "[%s]: ALUA TG Port not available," |
| 3119 | " SenseKey: NOT_READY, ASC/ASCQ: 0x04/0x%02x\n", |
| 3120 | CMD_TFO(cmd)->get_fabric_name(), alua_ascq); |
| 3121 | #endif |
| 3122 | transport_set_sense_codes(cmd, 0x04, alua_ascq); |
| 3123 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 3124 | cmd->scsi_sense_reason = TCM_CHECK_CONDITION_NOT_READY; |
| 3125 | return -2; |
| 3126 | } |
| 3127 | goto out_invalid_cdb_field; |
| 3128 | } |
| 3129 | /* |
| 3130 | * Check status for SPC-3 Persistent Reservations |
| 3131 | */ |
| 3132 | if (T10_PR_OPS(su_dev)->t10_reservation_check(cmd, &pr_reg_type) != 0) { |
| 3133 | if (T10_PR_OPS(su_dev)->t10_seq_non_holder( |
| 3134 | cmd, cdb, pr_reg_type) != 0) |
| 3135 | return transport_handle_reservation_conflict(cmd); |
| 3136 | /* |
| 3137 | * This means the CDB is allowed for the SCSI Initiator port |
| 3138 | * when said port is *NOT* holding the legacy SPC-2 or |
| 3139 | * SPC-3 Persistent Reservation. |
| 3140 | */ |
| 3141 | } |
| 3142 | |
| 3143 | switch (cdb[0]) { |
| 3144 | case READ_6: |
| 3145 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); |
| 3146 | if (sector_ret) |
| 3147 | goto out_unsupported_cdb; |
| 3148 | size = transport_get_size(sectors, cdb, cmd); |
| 3149 | cmd->transport_split_cdb = &split_cdb_XX_6; |
| 3150 | T_TASK(cmd)->t_task_lba = transport_lba_21(cdb); |
| 3151 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
| 3152 | break; |
| 3153 | case READ_10: |
| 3154 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); |
| 3155 | if (sector_ret) |
| 3156 | goto out_unsupported_cdb; |
| 3157 | size = transport_get_size(sectors, cdb, cmd); |
| 3158 | cmd->transport_split_cdb = &split_cdb_XX_10; |
| 3159 | T_TASK(cmd)->t_task_lba = transport_lba_32(cdb); |
| 3160 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
| 3161 | break; |
| 3162 | case READ_12: |
| 3163 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); |
| 3164 | if (sector_ret) |
| 3165 | goto out_unsupported_cdb; |
| 3166 | size = transport_get_size(sectors, cdb, cmd); |
| 3167 | cmd->transport_split_cdb = &split_cdb_XX_12; |
| 3168 | T_TASK(cmd)->t_task_lba = transport_lba_32(cdb); |
| 3169 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
| 3170 | break; |
| 3171 | case READ_16: |
| 3172 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); |
| 3173 | if (sector_ret) |
| 3174 | goto out_unsupported_cdb; |
| 3175 | size = transport_get_size(sectors, cdb, cmd); |
| 3176 | cmd->transport_split_cdb = &split_cdb_XX_16; |
| 3177 | T_TASK(cmd)->t_task_lba = transport_lba_64(cdb); |
| 3178 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
| 3179 | break; |
| 3180 | case WRITE_6: |
| 3181 | sectors = transport_get_sectors_6(cdb, cmd, §or_ret); |
| 3182 | if (sector_ret) |
| 3183 | goto out_unsupported_cdb; |
| 3184 | size = transport_get_size(sectors, cdb, cmd); |
| 3185 | cmd->transport_split_cdb = &split_cdb_XX_6; |
| 3186 | T_TASK(cmd)->t_task_lba = transport_lba_21(cdb); |
| 3187 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
| 3188 | break; |
| 3189 | case WRITE_10: |
| 3190 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); |
| 3191 | if (sector_ret) |
| 3192 | goto out_unsupported_cdb; |
| 3193 | size = transport_get_size(sectors, cdb, cmd); |
| 3194 | cmd->transport_split_cdb = &split_cdb_XX_10; |
| 3195 | T_TASK(cmd)->t_task_lba = transport_lba_32(cdb); |
| 3196 | T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8); |
| 3197 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
| 3198 | break; |
| 3199 | case WRITE_12: |
| 3200 | sectors = transport_get_sectors_12(cdb, cmd, §or_ret); |
| 3201 | if (sector_ret) |
| 3202 | goto out_unsupported_cdb; |
| 3203 | size = transport_get_size(sectors, cdb, cmd); |
| 3204 | cmd->transport_split_cdb = &split_cdb_XX_12; |
| 3205 | T_TASK(cmd)->t_task_lba = transport_lba_32(cdb); |
| 3206 | T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8); |
| 3207 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
| 3208 | break; |
| 3209 | case WRITE_16: |
| 3210 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); |
| 3211 | if (sector_ret) |
| 3212 | goto out_unsupported_cdb; |
| 3213 | size = transport_get_size(sectors, cdb, cmd); |
| 3214 | cmd->transport_split_cdb = &split_cdb_XX_16; |
| 3215 | T_TASK(cmd)->t_task_lba = transport_lba_64(cdb); |
| 3216 | T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8); |
| 3217 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
| 3218 | break; |
| 3219 | case XDWRITEREAD_10: |
| 3220 | if ((cmd->data_direction != DMA_TO_DEVICE) || |
| 3221 | !(T_TASK(cmd)->t_tasks_bidi)) |
| 3222 | goto out_invalid_cdb_field; |
| 3223 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); |
| 3224 | if (sector_ret) |
| 3225 | goto out_unsupported_cdb; |
| 3226 | size = transport_get_size(sectors, cdb, cmd); |
| 3227 | cmd->transport_split_cdb = &split_cdb_XX_10; |
| 3228 | T_TASK(cmd)->t_task_lba = transport_lba_32(cdb); |
| 3229 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
| 3230 | passthrough = (TRANSPORT(dev)->transport_type == |
| 3231 | TRANSPORT_PLUGIN_PHBA_PDEV); |
| 3232 | /* |
| 3233 | * Skip the remaining assignments for TCM/PSCSI passthrough |
| 3234 | */ |
| 3235 | if (passthrough) |
| 3236 | break; |
| 3237 | /* |
| 3238 | * Setup BIDI XOR callback to be run during transport_generic_complete_ok() |
| 3239 | */ |
| 3240 | cmd->transport_complete_callback = &transport_xor_callback; |
| 3241 | T_TASK(cmd)->t_tasks_fua = (cdb[1] & 0x8); |
| 3242 | break; |
| 3243 | case VARIABLE_LENGTH_CMD: |
| 3244 | service_action = get_unaligned_be16(&cdb[8]); |
| 3245 | /* |
| 3246 | * Determine if this is TCM/PSCSI device and we should disable |
| 3247 | * internal emulation for this CDB. |
| 3248 | */ |
| 3249 | passthrough = (TRANSPORT(dev)->transport_type == |
| 3250 | TRANSPORT_PLUGIN_PHBA_PDEV); |
| 3251 | |
| 3252 | switch (service_action) { |
| 3253 | case XDWRITEREAD_32: |
| 3254 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); |
| 3255 | if (sector_ret) |
| 3256 | goto out_unsupported_cdb; |
| 3257 | size = transport_get_size(sectors, cdb, cmd); |
| 3258 | /* |
| 3259 | * Use WRITE_32 and READ_32 opcodes for the emulated |
| 3260 | * XDWRITE_READ_32 logic. |
| 3261 | */ |
| 3262 | cmd->transport_split_cdb = &split_cdb_XX_32; |
| 3263 | T_TASK(cmd)->t_task_lba = transport_lba_64_ext(cdb); |
| 3264 | cmd->se_cmd_flags |= SCF_SCSI_DATA_SG_IO_CDB; |
| 3265 | |
| 3266 | /* |
| 3267 | * Skip the remaining assignments for TCM/PSCSI passthrough |
| 3268 | */ |
| 3269 | if (passthrough) |
| 3270 | break; |
| 3271 | |
| 3272 | /* |
| 3273 | * Setup BIDI XOR callback to be run during |
| 3274 | * transport_generic_complete_ok() |
| 3275 | */ |
| 3276 | cmd->transport_complete_callback = &transport_xor_callback; |
| 3277 | T_TASK(cmd)->t_tasks_fua = (cdb[10] & 0x8); |
| 3278 | break; |
| 3279 | case WRITE_SAME_32: |
| 3280 | sectors = transport_get_sectors_32(cdb, cmd, §or_ret); |
| 3281 | if (sector_ret) |
| 3282 | goto out_unsupported_cdb; |
| 3283 | size = transport_get_size(sectors, cdb, cmd); |
| 3284 | T_TASK(cmd)->t_task_lba = get_unaligned_be64(&cdb[12]); |
| 3285 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
| 3286 | |
| 3287 | /* |
| 3288 | * Skip the remaining assignments for TCM/PSCSI passthrough |
| 3289 | */ |
| 3290 | if (passthrough) |
| 3291 | break; |
| 3292 | |
| 3293 | if ((cdb[10] & 0x04) || (cdb[10] & 0x02)) { |
| 3294 | printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA" |
| 3295 | " bits not supported for Block Discard" |
| 3296 | " Emulation\n"); |
| 3297 | goto out_invalid_cdb_field; |
| 3298 | } |
| 3299 | /* |
| 3300 | * Currently for the emulated case we only accept |
| 3301 | * tpws with the UNMAP=1 bit set. |
| 3302 | */ |
| 3303 | if (!(cdb[10] & 0x08)) { |
| 3304 | printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not" |
| 3305 | " supported for Block Discard Emulation\n"); |
| 3306 | goto out_invalid_cdb_field; |
| 3307 | } |
| 3308 | break; |
| 3309 | default: |
| 3310 | printk(KERN_ERR "VARIABLE_LENGTH_CMD service action" |
| 3311 | " 0x%04x not supported\n", service_action); |
| 3312 | goto out_unsupported_cdb; |
| 3313 | } |
| 3314 | break; |
| 3315 | case 0xa3: |
| 3316 | if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) { |
| 3317 | /* MAINTENANCE_IN from SCC-2 */ |
| 3318 | /* |
| 3319 | * Check for emulated MI_REPORT_TARGET_PGS. |
| 3320 | */ |
| 3321 | if (cdb[1] == MI_REPORT_TARGET_PGS) { |
| 3322 | cmd->transport_emulate_cdb = |
| 3323 | (T10_ALUA(su_dev)->alua_type == |
| 3324 | SPC3_ALUA_EMULATED) ? |
| 3325 | &core_emulate_report_target_port_groups : |
| 3326 | NULL; |
| 3327 | } |
| 3328 | size = (cdb[6] << 24) | (cdb[7] << 16) | |
| 3329 | (cdb[8] << 8) | cdb[9]; |
| 3330 | } else { |
| 3331 | /* GPCMD_SEND_KEY from multi media commands */ |
| 3332 | size = (cdb[8] << 8) + cdb[9]; |
| 3333 | } |
| 3334 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3335 | break; |
| 3336 | case MODE_SELECT: |
| 3337 | size = cdb[4]; |
| 3338 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
| 3339 | break; |
| 3340 | case MODE_SELECT_10: |
| 3341 | size = (cdb[7] << 8) + cdb[8]; |
| 3342 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
| 3343 | break; |
| 3344 | case MODE_SENSE: |
| 3345 | size = cdb[4]; |
| 3346 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3347 | break; |
| 3348 | case MODE_SENSE_10: |
| 3349 | case GPCMD_READ_BUFFER_CAPACITY: |
| 3350 | case GPCMD_SEND_OPC: |
| 3351 | case LOG_SELECT: |
| 3352 | case LOG_SENSE: |
| 3353 | size = (cdb[7] << 8) + cdb[8]; |
| 3354 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3355 | break; |
| 3356 | case READ_BLOCK_LIMITS: |
| 3357 | size = READ_BLOCK_LEN; |
| 3358 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3359 | break; |
| 3360 | case GPCMD_GET_CONFIGURATION: |
| 3361 | case GPCMD_READ_FORMAT_CAPACITIES: |
| 3362 | case GPCMD_READ_DISC_INFO: |
| 3363 | case GPCMD_READ_TRACK_RZONE_INFO: |
| 3364 | size = (cdb[7] << 8) + cdb[8]; |
| 3365 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
| 3366 | break; |
| 3367 | case PERSISTENT_RESERVE_IN: |
| 3368 | case PERSISTENT_RESERVE_OUT: |
| 3369 | cmd->transport_emulate_cdb = |
| 3370 | (T10_RES(su_dev)->res_type == |
| 3371 | SPC3_PERSISTENT_RESERVATIONS) ? |
| 3372 | &core_scsi3_emulate_pr : NULL; |
| 3373 | size = (cdb[7] << 8) + cdb[8]; |
| 3374 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3375 | break; |
| 3376 | case GPCMD_MECHANISM_STATUS: |
| 3377 | case GPCMD_READ_DVD_STRUCTURE: |
| 3378 | size = (cdb[8] << 8) + cdb[9]; |
| 3379 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
| 3380 | break; |
| 3381 | case READ_POSITION: |
| 3382 | size = READ_POSITION_LEN; |
| 3383 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3384 | break; |
| 3385 | case 0xa4: |
| 3386 | if (TRANSPORT(dev)->get_device_type(dev) != TYPE_ROM) { |
| 3387 | /* MAINTENANCE_OUT from SCC-2 |
| 3388 | * |
| 3389 | * Check for emulated MO_SET_TARGET_PGS. |
| 3390 | */ |
| 3391 | if (cdb[1] == MO_SET_TARGET_PGS) { |
| 3392 | cmd->transport_emulate_cdb = |
| 3393 | (T10_ALUA(su_dev)->alua_type == |
| 3394 | SPC3_ALUA_EMULATED) ? |
| 3395 | &core_emulate_set_target_port_groups : |
| 3396 | NULL; |
| 3397 | } |
| 3398 | |
| 3399 | size = (cdb[6] << 24) | (cdb[7] << 16) | |
| 3400 | (cdb[8] << 8) | cdb[9]; |
| 3401 | } else { |
| 3402 | /* GPCMD_REPORT_KEY from multi media commands */ |
| 3403 | size = (cdb[8] << 8) + cdb[9]; |
| 3404 | } |
| 3405 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3406 | break; |
| 3407 | case INQUIRY: |
| 3408 | size = (cdb[3] << 8) + cdb[4]; |
| 3409 | /* |
| 3410 | * Do implict HEAD_OF_QUEUE processing for INQUIRY. |
| 3411 | * See spc4r17 section 5.3 |
| 3412 | */ |
| 3413 | if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
| 3414 | cmd->sam_task_attr = TASK_ATTR_HOQ; |
| 3415 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3416 | break; |
| 3417 | case READ_BUFFER: |
| 3418 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; |
| 3419 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3420 | break; |
| 3421 | case READ_CAPACITY: |
| 3422 | size = READ_CAP_LEN; |
| 3423 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3424 | break; |
| 3425 | case READ_MEDIA_SERIAL_NUMBER: |
| 3426 | case SECURITY_PROTOCOL_IN: |
| 3427 | case SECURITY_PROTOCOL_OUT: |
| 3428 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
| 3429 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3430 | break; |
| 3431 | case SERVICE_ACTION_IN: |
| 3432 | case ACCESS_CONTROL_IN: |
| 3433 | case ACCESS_CONTROL_OUT: |
| 3434 | case EXTENDED_COPY: |
| 3435 | case READ_ATTRIBUTE: |
| 3436 | case RECEIVE_COPY_RESULTS: |
| 3437 | case WRITE_ATTRIBUTE: |
| 3438 | size = (cdb[10] << 24) | (cdb[11] << 16) | |
| 3439 | (cdb[12] << 8) | cdb[13]; |
| 3440 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3441 | break; |
| 3442 | case RECEIVE_DIAGNOSTIC: |
| 3443 | case SEND_DIAGNOSTIC: |
| 3444 | size = (cdb[3] << 8) | cdb[4]; |
| 3445 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3446 | break; |
| 3447 | /* #warning FIXME: Figure out correct GPCMD_READ_CD blocksize. */ |
| 3448 | #if 0 |
| 3449 | case GPCMD_READ_CD: |
| 3450 | sectors = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; |
| 3451 | size = (2336 * sectors); |
| 3452 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3453 | break; |
| 3454 | #endif |
| 3455 | case READ_TOC: |
| 3456 | size = cdb[8]; |
| 3457 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3458 | break; |
| 3459 | case REQUEST_SENSE: |
| 3460 | size = cdb[4]; |
| 3461 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3462 | break; |
| 3463 | case READ_ELEMENT_STATUS: |
| 3464 | size = 65536 * cdb[7] + 256 * cdb[8] + cdb[9]; |
| 3465 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3466 | break; |
| 3467 | case WRITE_BUFFER: |
| 3468 | size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8]; |
| 3469 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3470 | break; |
| 3471 | case RESERVE: |
| 3472 | case RESERVE_10: |
| 3473 | /* |
| 3474 | * The SPC-2 RESERVE does not contain a size in the SCSI CDB. |
| 3475 | * Assume the passthrough or $FABRIC_MOD will tell us about it. |
| 3476 | */ |
| 3477 | if (cdb[0] == RESERVE_10) |
| 3478 | size = (cdb[7] << 8) | cdb[8]; |
| 3479 | else |
| 3480 | size = cmd->data_length; |
| 3481 | |
| 3482 | /* |
| 3483 | * Setup the legacy emulated handler for SPC-2 and |
| 3484 | * >= SPC-3 compatible reservation handling (CRH=1) |
| 3485 | * Otherwise, we assume the underlying SCSI logic is |
| 3486 | * is running in SPC_PASSTHROUGH, and wants reservations |
| 3487 | * emulation disabled. |
| 3488 | */ |
| 3489 | cmd->transport_emulate_cdb = |
| 3490 | (T10_RES(su_dev)->res_type != |
| 3491 | SPC_PASSTHROUGH) ? |
| 3492 | &core_scsi2_emulate_crh : NULL; |
| 3493 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
| 3494 | break; |
| 3495 | case RELEASE: |
| 3496 | case RELEASE_10: |
| 3497 | /* |
| 3498 | * The SPC-2 RELEASE does not contain a size in the SCSI CDB. |
| 3499 | * Assume the passthrough or $FABRIC_MOD will tell us about it. |
| 3500 | */ |
| 3501 | if (cdb[0] == RELEASE_10) |
| 3502 | size = (cdb[7] << 8) | cdb[8]; |
| 3503 | else |
| 3504 | size = cmd->data_length; |
| 3505 | |
| 3506 | cmd->transport_emulate_cdb = |
| 3507 | (T10_RES(su_dev)->res_type != |
| 3508 | SPC_PASSTHROUGH) ? |
| 3509 | &core_scsi2_emulate_crh : NULL; |
| 3510 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
| 3511 | break; |
| 3512 | case SYNCHRONIZE_CACHE: |
| 3513 | case 0x91: /* SYNCHRONIZE_CACHE_16: */ |
| 3514 | /* |
| 3515 | * Extract LBA and range to be flushed for emulated SYNCHRONIZE_CACHE |
| 3516 | */ |
| 3517 | if (cdb[0] == SYNCHRONIZE_CACHE) { |
| 3518 | sectors = transport_get_sectors_10(cdb, cmd, §or_ret); |
| 3519 | T_TASK(cmd)->t_task_lba = transport_lba_32(cdb); |
| 3520 | } else { |
| 3521 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); |
| 3522 | T_TASK(cmd)->t_task_lba = transport_lba_64(cdb); |
| 3523 | } |
| 3524 | if (sector_ret) |
| 3525 | goto out_unsupported_cdb; |
| 3526 | |
| 3527 | size = transport_get_size(sectors, cdb, cmd); |
| 3528 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
| 3529 | |
| 3530 | /* |
| 3531 | * For TCM/pSCSI passthrough, skip cmd->transport_emulate_cdb() |
| 3532 | */ |
| 3533 | if (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV) |
| 3534 | break; |
| 3535 | /* |
| 3536 | * Set SCF_EMULATE_CDB_ASYNC to ensure asynchronous operation |
| 3537 | * for SYNCHRONIZE_CACHE* Immed=1 case in __transport_execute_tasks() |
| 3538 | */ |
| 3539 | cmd->se_cmd_flags |= SCF_EMULATE_CDB_ASYNC; |
| 3540 | /* |
| 3541 | * Check to ensure that LBA + Range does not exceed past end of |
| 3542 | * device. |
| 3543 | */ |
| 3544 | if (transport_get_sectors(cmd) < 0) |
| 3545 | goto out_invalid_cdb_field; |
| 3546 | break; |
| 3547 | case UNMAP: |
| 3548 | size = get_unaligned_be16(&cdb[7]); |
| 3549 | passthrough = (TRANSPORT(dev)->transport_type == |
| 3550 | TRANSPORT_PLUGIN_PHBA_PDEV); |
| 3551 | /* |
| 3552 | * Determine if the received UNMAP used to for direct passthrough |
| 3553 | * into Linux/SCSI with struct request via TCM/pSCSI or we are |
| 3554 | * signaling the use of internal transport_generic_unmap() emulation |
| 3555 | * for UNMAP -> Linux/BLOCK disbard with TCM/IBLOCK and TCM/FILEIO |
| 3556 | * subsystem plugin backstores. |
| 3557 | */ |
| 3558 | if (!(passthrough)) |
| 3559 | cmd->se_cmd_flags |= SCF_EMULATE_SYNC_UNMAP; |
| 3560 | |
| 3561 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3562 | break; |
| 3563 | case WRITE_SAME_16: |
| 3564 | sectors = transport_get_sectors_16(cdb, cmd, §or_ret); |
| 3565 | if (sector_ret) |
| 3566 | goto out_unsupported_cdb; |
| 3567 | size = transport_get_size(sectors, cdb, cmd); |
| 3568 | T_TASK(cmd)->t_task_lba = get_unaligned_be16(&cdb[2]); |
| 3569 | passthrough = (TRANSPORT(dev)->transport_type == |
| 3570 | TRANSPORT_PLUGIN_PHBA_PDEV); |
| 3571 | /* |
| 3572 | * Determine if the received WRITE_SAME_16 is used to for direct |
| 3573 | * passthrough into Linux/SCSI with struct request via TCM/pSCSI |
| 3574 | * or we are signaling the use of internal WRITE_SAME + UNMAP=1 |
| 3575 | * emulation for -> Linux/BLOCK disbard with TCM/IBLOCK and |
| 3576 | * TCM/FILEIO subsystem plugin backstores. |
| 3577 | */ |
| 3578 | if (!(passthrough)) { |
| 3579 | if ((cdb[1] & 0x04) || (cdb[1] & 0x02)) { |
| 3580 | printk(KERN_ERR "WRITE_SAME PBDATA and LBDATA" |
| 3581 | " bits not supported for Block Discard" |
| 3582 | " Emulation\n"); |
| 3583 | goto out_invalid_cdb_field; |
| 3584 | } |
| 3585 | /* |
| 3586 | * Currently for the emulated case we only accept |
| 3587 | * tpws with the UNMAP=1 bit set. |
| 3588 | */ |
| 3589 | if (!(cdb[1] & 0x08)) { |
| 3590 | printk(KERN_ERR "WRITE_SAME w/o UNMAP bit not " |
| 3591 | " supported for Block Discard Emulation\n"); |
| 3592 | goto out_invalid_cdb_field; |
| 3593 | } |
| 3594 | } |
| 3595 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_SG_IO_CDB; |
| 3596 | break; |
| 3597 | case ALLOW_MEDIUM_REMOVAL: |
| 3598 | case GPCMD_CLOSE_TRACK: |
| 3599 | case ERASE: |
| 3600 | case INITIALIZE_ELEMENT_STATUS: |
| 3601 | case GPCMD_LOAD_UNLOAD: |
| 3602 | case REZERO_UNIT: |
| 3603 | case SEEK_10: |
| 3604 | case GPCMD_SET_SPEED: |
| 3605 | case SPACE: |
| 3606 | case START_STOP: |
| 3607 | case TEST_UNIT_READY: |
| 3608 | case VERIFY: |
| 3609 | case WRITE_FILEMARKS: |
| 3610 | case MOVE_MEDIUM: |
| 3611 | cmd->se_cmd_flags |= SCF_SCSI_NON_DATA_CDB; |
| 3612 | break; |
| 3613 | case REPORT_LUNS: |
| 3614 | cmd->transport_emulate_cdb = |
| 3615 | &transport_core_report_lun_response; |
| 3616 | size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9]; |
| 3617 | /* |
| 3618 | * Do implict HEAD_OF_QUEUE processing for REPORT_LUNS |
| 3619 | * See spc4r17 section 5.3 |
| 3620 | */ |
| 3621 | if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
| 3622 | cmd->sam_task_attr = TASK_ATTR_HOQ; |
| 3623 | cmd->se_cmd_flags |= SCF_SCSI_CONTROL_NONSG_IO_CDB; |
| 3624 | break; |
| 3625 | default: |
| 3626 | printk(KERN_WARNING "TARGET_CORE[%s]: Unsupported SCSI Opcode" |
| 3627 | " 0x%02x, sending CHECK_CONDITION.\n", |
| 3628 | CMD_TFO(cmd)->get_fabric_name(), cdb[0]); |
| 3629 | cmd->transport_wait_for_tasks = &transport_nop_wait_for_tasks; |
| 3630 | goto out_unsupported_cdb; |
| 3631 | } |
| 3632 | |
| 3633 | if (size != cmd->data_length) { |
| 3634 | printk(KERN_WARNING "TARGET_CORE[%s]: Expected Transfer Length:" |
| 3635 | " %u does not match SCSI CDB Length: %u for SAM Opcode:" |
| 3636 | " 0x%02x\n", CMD_TFO(cmd)->get_fabric_name(), |
| 3637 | cmd->data_length, size, cdb[0]); |
| 3638 | |
| 3639 | cmd->cmd_spdtl = size; |
| 3640 | |
| 3641 | if (cmd->data_direction == DMA_TO_DEVICE) { |
| 3642 | printk(KERN_ERR "Rejecting underflow/overflow" |
| 3643 | " WRITE data\n"); |
| 3644 | goto out_invalid_cdb_field; |
| 3645 | } |
| 3646 | /* |
| 3647 | * Reject READ_* or WRITE_* with overflow/underflow for |
| 3648 | * type SCF_SCSI_DATA_SG_IO_CDB. |
| 3649 | */ |
| 3650 | if (!(ret) && (DEV_ATTRIB(dev)->block_size != 512)) { |
| 3651 | printk(KERN_ERR "Failing OVERFLOW/UNDERFLOW for LBA op" |
| 3652 | " CDB on non 512-byte sector setup subsystem" |
| 3653 | " plugin: %s\n", TRANSPORT(dev)->name); |
| 3654 | /* Returns CHECK_CONDITION + INVALID_CDB_FIELD */ |
| 3655 | goto out_invalid_cdb_field; |
| 3656 | } |
| 3657 | |
| 3658 | if (size > cmd->data_length) { |
| 3659 | cmd->se_cmd_flags |= SCF_OVERFLOW_BIT; |
| 3660 | cmd->residual_count = (size - cmd->data_length); |
| 3661 | } else { |
| 3662 | cmd->se_cmd_flags |= SCF_UNDERFLOW_BIT; |
| 3663 | cmd->residual_count = (cmd->data_length - size); |
| 3664 | } |
| 3665 | cmd->data_length = size; |
| 3666 | } |
| 3667 | |
| 3668 | transport_set_supported_SAM_opcode(cmd); |
| 3669 | return ret; |
| 3670 | |
| 3671 | out_unsupported_cdb: |
| 3672 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 3673 | cmd->scsi_sense_reason = TCM_UNSUPPORTED_SCSI_OPCODE; |
| 3674 | return -2; |
| 3675 | out_invalid_cdb_field: |
| 3676 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 3677 | cmd->scsi_sense_reason = TCM_INVALID_CDB_FIELD; |
| 3678 | return -2; |
| 3679 | } |
| 3680 | |
| 3681 | static inline void transport_release_tasks(struct se_cmd *); |
| 3682 | |
| 3683 | /* |
| 3684 | * This function will copy a contiguous *src buffer into a destination |
| 3685 | * struct scatterlist array. |
| 3686 | */ |
| 3687 | static void transport_memcpy_write_contig( |
| 3688 | struct se_cmd *cmd, |
| 3689 | struct scatterlist *sg_d, |
| 3690 | unsigned char *src) |
| 3691 | { |
| 3692 | u32 i = 0, length = 0, total_length = cmd->data_length; |
| 3693 | void *dst; |
| 3694 | |
| 3695 | while (total_length) { |
| 3696 | length = sg_d[i].length; |
| 3697 | |
| 3698 | if (length > total_length) |
| 3699 | length = total_length; |
| 3700 | |
| 3701 | dst = sg_virt(&sg_d[i]); |
| 3702 | |
| 3703 | memcpy(dst, src, length); |
| 3704 | |
| 3705 | if (!(total_length -= length)) |
| 3706 | return; |
| 3707 | |
| 3708 | src += length; |
| 3709 | i++; |
| 3710 | } |
| 3711 | } |
| 3712 | |
| 3713 | /* |
| 3714 | * This function will copy a struct scatterlist array *sg_s into a destination |
| 3715 | * contiguous *dst buffer. |
| 3716 | */ |
| 3717 | static void transport_memcpy_read_contig( |
| 3718 | struct se_cmd *cmd, |
| 3719 | unsigned char *dst, |
| 3720 | struct scatterlist *sg_s) |
| 3721 | { |
| 3722 | u32 i = 0, length = 0, total_length = cmd->data_length; |
| 3723 | void *src; |
| 3724 | |
| 3725 | while (total_length) { |
| 3726 | length = sg_s[i].length; |
| 3727 | |
| 3728 | if (length > total_length) |
| 3729 | length = total_length; |
| 3730 | |
| 3731 | src = sg_virt(&sg_s[i]); |
| 3732 | |
| 3733 | memcpy(dst, src, length); |
| 3734 | |
| 3735 | if (!(total_length -= length)) |
| 3736 | return; |
| 3737 | |
| 3738 | dst += length; |
| 3739 | i++; |
| 3740 | } |
| 3741 | } |
| 3742 | |
| 3743 | static void transport_memcpy_se_mem_read_contig( |
| 3744 | struct se_cmd *cmd, |
| 3745 | unsigned char *dst, |
| 3746 | struct list_head *se_mem_list) |
| 3747 | { |
| 3748 | struct se_mem *se_mem; |
| 3749 | void *src; |
| 3750 | u32 length = 0, total_length = cmd->data_length; |
| 3751 | |
| 3752 | list_for_each_entry(se_mem, se_mem_list, se_list) { |
| 3753 | length = se_mem->se_len; |
| 3754 | |
| 3755 | if (length > total_length) |
| 3756 | length = total_length; |
| 3757 | |
| 3758 | src = page_address(se_mem->se_page) + se_mem->se_off; |
| 3759 | |
| 3760 | memcpy(dst, src, length); |
| 3761 | |
| 3762 | if (!(total_length -= length)) |
| 3763 | return; |
| 3764 | |
| 3765 | dst += length; |
| 3766 | } |
| 3767 | } |
| 3768 | |
| 3769 | /* |
| 3770 | * Called from transport_generic_complete_ok() and |
| 3771 | * transport_generic_request_failure() to determine which dormant/delayed |
| 3772 | * and ordered cmds need to have their tasks added to the execution queue. |
| 3773 | */ |
| 3774 | static void transport_complete_task_attr(struct se_cmd *cmd) |
| 3775 | { |
| 3776 | struct se_device *dev = SE_DEV(cmd); |
| 3777 | struct se_cmd *cmd_p, *cmd_tmp; |
| 3778 | int new_active_tasks = 0; |
| 3779 | |
| 3780 | if (cmd->sam_task_attr == TASK_ATTR_SIMPLE) { |
| 3781 | atomic_dec(&dev->simple_cmds); |
| 3782 | smp_mb__after_atomic_dec(); |
| 3783 | dev->dev_cur_ordered_id++; |
| 3784 | DEBUG_STA("Incremented dev->dev_cur_ordered_id: %u for" |
| 3785 | " SIMPLE: %u\n", dev->dev_cur_ordered_id, |
| 3786 | cmd->se_ordered_id); |
| 3787 | } else if (cmd->sam_task_attr == TASK_ATTR_HOQ) { |
| 3788 | atomic_dec(&dev->dev_hoq_count); |
| 3789 | smp_mb__after_atomic_dec(); |
| 3790 | dev->dev_cur_ordered_id++; |
| 3791 | DEBUG_STA("Incremented dev_cur_ordered_id: %u for" |
| 3792 | " HEAD_OF_QUEUE: %u\n", dev->dev_cur_ordered_id, |
| 3793 | cmd->se_ordered_id); |
| 3794 | } else if (cmd->sam_task_attr == TASK_ATTR_ORDERED) { |
| 3795 | spin_lock(&dev->ordered_cmd_lock); |
| 3796 | list_del(&cmd->se_ordered_list); |
| 3797 | atomic_dec(&dev->dev_ordered_sync); |
| 3798 | smp_mb__after_atomic_dec(); |
| 3799 | spin_unlock(&dev->ordered_cmd_lock); |
| 3800 | |
| 3801 | dev->dev_cur_ordered_id++; |
| 3802 | DEBUG_STA("Incremented dev_cur_ordered_id: %u for ORDERED:" |
| 3803 | " %u\n", dev->dev_cur_ordered_id, cmd->se_ordered_id); |
| 3804 | } |
| 3805 | /* |
| 3806 | * Process all commands up to the last received |
| 3807 | * ORDERED task attribute which requires another blocking |
| 3808 | * boundary |
| 3809 | */ |
| 3810 | spin_lock(&dev->delayed_cmd_lock); |
| 3811 | list_for_each_entry_safe(cmd_p, cmd_tmp, |
| 3812 | &dev->delayed_cmd_list, se_delayed_list) { |
| 3813 | |
| 3814 | list_del(&cmd_p->se_delayed_list); |
| 3815 | spin_unlock(&dev->delayed_cmd_lock); |
| 3816 | |
| 3817 | DEBUG_STA("Calling add_tasks() for" |
| 3818 | " cmd_p: 0x%02x Task Attr: 0x%02x" |
| 3819 | " Dormant -> Active, se_ordered_id: %u\n", |
| 3820 | T_TASK(cmd_p)->t_task_cdb[0], |
| 3821 | cmd_p->sam_task_attr, cmd_p->se_ordered_id); |
| 3822 | |
| 3823 | transport_add_tasks_from_cmd(cmd_p); |
| 3824 | new_active_tasks++; |
| 3825 | |
| 3826 | spin_lock(&dev->delayed_cmd_lock); |
| 3827 | if (cmd_p->sam_task_attr == TASK_ATTR_ORDERED) |
| 3828 | break; |
| 3829 | } |
| 3830 | spin_unlock(&dev->delayed_cmd_lock); |
| 3831 | /* |
| 3832 | * If new tasks have become active, wake up the transport thread |
| 3833 | * to do the processing of the Active tasks. |
| 3834 | */ |
| 3835 | if (new_active_tasks != 0) |
| 3836 | wake_up_interruptible(&dev->dev_queue_obj->thread_wq); |
| 3837 | } |
| 3838 | |
| 3839 | static void transport_generic_complete_ok(struct se_cmd *cmd) |
| 3840 | { |
| 3841 | int reason = 0; |
| 3842 | /* |
| 3843 | * Check if we need to move delayed/dormant tasks from cmds on the |
| 3844 | * delayed execution list after a HEAD_OF_QUEUE or ORDERED Task |
| 3845 | * Attribute. |
| 3846 | */ |
| 3847 | if (SE_DEV(cmd)->dev_task_attr_type == SAM_TASK_ATTR_EMULATED) |
| 3848 | transport_complete_task_attr(cmd); |
| 3849 | /* |
| 3850 | * Check if we need to retrieve a sense buffer from |
| 3851 | * the struct se_cmd in question. |
| 3852 | */ |
| 3853 | if (cmd->se_cmd_flags & SCF_TRANSPORT_TASK_SENSE) { |
| 3854 | if (transport_get_sense_data(cmd) < 0) |
| 3855 | reason = TCM_NON_EXISTENT_LUN; |
| 3856 | |
| 3857 | /* |
| 3858 | * Only set when an struct se_task->task_scsi_status returned |
| 3859 | * a non GOOD status. |
| 3860 | */ |
| 3861 | if (cmd->scsi_status) { |
| 3862 | transport_send_check_condition_and_sense( |
| 3863 | cmd, reason, 1); |
| 3864 | transport_lun_remove_cmd(cmd); |
| 3865 | transport_cmd_check_stop_to_fabric(cmd); |
| 3866 | return; |
| 3867 | } |
| 3868 | } |
| 3869 | /* |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 3870 | * Check for a callback, used by amongst other things |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 3871 | * XDWRITE_READ_10 emulation. |
| 3872 | */ |
| 3873 | if (cmd->transport_complete_callback) |
| 3874 | cmd->transport_complete_callback(cmd); |
| 3875 | |
| 3876 | switch (cmd->data_direction) { |
| 3877 | case DMA_FROM_DEVICE: |
| 3878 | spin_lock(&cmd->se_lun->lun_sep_lock); |
| 3879 | if (SE_LUN(cmd)->lun_sep) { |
| 3880 | SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets += |
| 3881 | cmd->data_length; |
| 3882 | } |
| 3883 | spin_unlock(&cmd->se_lun->lun_sep_lock); |
| 3884 | /* |
| 3885 | * If enabled by TCM fabirc module pre-registered SGL |
| 3886 | * memory, perform the memcpy() from the TCM internal |
| 3887 | * contigious buffer back to the original SGL. |
| 3888 | */ |
| 3889 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG) |
| 3890 | transport_memcpy_write_contig(cmd, |
| 3891 | T_TASK(cmd)->t_task_pt_sgl, |
| 3892 | T_TASK(cmd)->t_task_buf); |
| 3893 | |
| 3894 | CMD_TFO(cmd)->queue_data_in(cmd); |
| 3895 | break; |
| 3896 | case DMA_TO_DEVICE: |
| 3897 | spin_lock(&cmd->se_lun->lun_sep_lock); |
| 3898 | if (SE_LUN(cmd)->lun_sep) { |
| 3899 | SE_LUN(cmd)->lun_sep->sep_stats.rx_data_octets += |
| 3900 | cmd->data_length; |
| 3901 | } |
| 3902 | spin_unlock(&cmd->se_lun->lun_sep_lock); |
| 3903 | /* |
| 3904 | * Check if we need to send READ payload for BIDI-COMMAND |
| 3905 | */ |
| 3906 | if (T_TASK(cmd)->t_mem_bidi_list != NULL) { |
| 3907 | spin_lock(&cmd->se_lun->lun_sep_lock); |
| 3908 | if (SE_LUN(cmd)->lun_sep) { |
| 3909 | SE_LUN(cmd)->lun_sep->sep_stats.tx_data_octets += |
| 3910 | cmd->data_length; |
| 3911 | } |
| 3912 | spin_unlock(&cmd->se_lun->lun_sep_lock); |
| 3913 | CMD_TFO(cmd)->queue_data_in(cmd); |
| 3914 | break; |
| 3915 | } |
| 3916 | /* Fall through for DMA_TO_DEVICE */ |
| 3917 | case DMA_NONE: |
| 3918 | CMD_TFO(cmd)->queue_status(cmd); |
| 3919 | break; |
| 3920 | default: |
| 3921 | break; |
| 3922 | } |
| 3923 | |
| 3924 | transport_lun_remove_cmd(cmd); |
| 3925 | transport_cmd_check_stop_to_fabric(cmd); |
| 3926 | } |
| 3927 | |
| 3928 | static void transport_free_dev_tasks(struct se_cmd *cmd) |
| 3929 | { |
| 3930 | struct se_task *task, *task_tmp; |
| 3931 | unsigned long flags; |
| 3932 | |
| 3933 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 3934 | list_for_each_entry_safe(task, task_tmp, |
| 3935 | &T_TASK(cmd)->t_task_list, t_list) { |
| 3936 | if (atomic_read(&task->task_active)) |
| 3937 | continue; |
| 3938 | |
| 3939 | kfree(task->task_sg_bidi); |
| 3940 | kfree(task->task_sg); |
| 3941 | |
| 3942 | list_del(&task->t_list); |
| 3943 | |
| 3944 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 3945 | if (task->se_dev) |
| 3946 | TRANSPORT(task->se_dev)->free_task(task); |
| 3947 | else |
| 3948 | printk(KERN_ERR "task[%u] - task->se_dev is NULL\n", |
| 3949 | task->task_no); |
| 3950 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 3951 | } |
| 3952 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 3953 | } |
| 3954 | |
| 3955 | static inline void transport_free_pages(struct se_cmd *cmd) |
| 3956 | { |
| 3957 | struct se_mem *se_mem, *se_mem_tmp; |
| 3958 | int free_page = 1; |
| 3959 | |
| 3960 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC) |
| 3961 | free_page = 0; |
| 3962 | if (cmd->se_dev->transport->do_se_mem_map) |
| 3963 | free_page = 0; |
| 3964 | |
| 3965 | if (T_TASK(cmd)->t_task_buf) { |
| 3966 | kfree(T_TASK(cmd)->t_task_buf); |
| 3967 | T_TASK(cmd)->t_task_buf = NULL; |
| 3968 | return; |
| 3969 | } |
| 3970 | |
| 3971 | /* |
| 3972 | * Caller will handle releasing of struct se_mem. |
| 3973 | */ |
| 3974 | if (cmd->se_cmd_flags & SCF_CMD_PASSTHROUGH_NOALLOC) |
| 3975 | return; |
| 3976 | |
| 3977 | if (!(T_TASK(cmd)->t_tasks_se_num)) |
| 3978 | return; |
| 3979 | |
| 3980 | list_for_each_entry_safe(se_mem, se_mem_tmp, |
| 3981 | T_TASK(cmd)->t_mem_list, se_list) { |
| 3982 | /* |
| 3983 | * We only release call __free_page(struct se_mem->se_page) when |
| 3984 | * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use, |
| 3985 | */ |
| 3986 | if (free_page) |
| 3987 | __free_page(se_mem->se_page); |
| 3988 | |
| 3989 | list_del(&se_mem->se_list); |
| 3990 | kmem_cache_free(se_mem_cache, se_mem); |
| 3991 | } |
| 3992 | |
| 3993 | if (T_TASK(cmd)->t_mem_bidi_list && T_TASK(cmd)->t_tasks_se_bidi_num) { |
| 3994 | list_for_each_entry_safe(se_mem, se_mem_tmp, |
| 3995 | T_TASK(cmd)->t_mem_bidi_list, se_list) { |
| 3996 | /* |
| 3997 | * We only release call __free_page(struct se_mem->se_page) when |
| 3998 | * SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC is NOT in use, |
| 3999 | */ |
| 4000 | if (free_page) |
| 4001 | __free_page(se_mem->se_page); |
| 4002 | |
| 4003 | list_del(&se_mem->se_list); |
| 4004 | kmem_cache_free(se_mem_cache, se_mem); |
| 4005 | } |
| 4006 | } |
| 4007 | |
| 4008 | kfree(T_TASK(cmd)->t_mem_bidi_list); |
| 4009 | T_TASK(cmd)->t_mem_bidi_list = NULL; |
| 4010 | kfree(T_TASK(cmd)->t_mem_list); |
| 4011 | T_TASK(cmd)->t_mem_list = NULL; |
| 4012 | T_TASK(cmd)->t_tasks_se_num = 0; |
| 4013 | } |
| 4014 | |
| 4015 | static inline void transport_release_tasks(struct se_cmd *cmd) |
| 4016 | { |
| 4017 | transport_free_dev_tasks(cmd); |
| 4018 | } |
| 4019 | |
| 4020 | static inline int transport_dec_and_check(struct se_cmd *cmd) |
| 4021 | { |
| 4022 | unsigned long flags; |
| 4023 | |
| 4024 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 4025 | if (atomic_read(&T_TASK(cmd)->t_fe_count)) { |
| 4026 | if (!(atomic_dec_and_test(&T_TASK(cmd)->t_fe_count))) { |
| 4027 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, |
| 4028 | flags); |
| 4029 | return 1; |
| 4030 | } |
| 4031 | } |
| 4032 | |
| 4033 | if (atomic_read(&T_TASK(cmd)->t_se_count)) { |
| 4034 | if (!(atomic_dec_and_test(&T_TASK(cmd)->t_se_count))) { |
| 4035 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, |
| 4036 | flags); |
| 4037 | return 1; |
| 4038 | } |
| 4039 | } |
| 4040 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 4041 | |
| 4042 | return 0; |
| 4043 | } |
| 4044 | |
| 4045 | static void transport_release_fe_cmd(struct se_cmd *cmd) |
| 4046 | { |
| 4047 | unsigned long flags; |
| 4048 | |
| 4049 | if (transport_dec_and_check(cmd)) |
| 4050 | return; |
| 4051 | |
| 4052 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 4053 | if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) { |
| 4054 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 4055 | goto free_pages; |
| 4056 | } |
| 4057 | atomic_set(&T_TASK(cmd)->transport_dev_active, 0); |
| 4058 | transport_all_task_dev_remove_state(cmd); |
| 4059 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 4060 | |
| 4061 | transport_release_tasks(cmd); |
| 4062 | free_pages: |
| 4063 | transport_free_pages(cmd); |
| 4064 | transport_free_se_cmd(cmd); |
| 4065 | CMD_TFO(cmd)->release_cmd_direct(cmd); |
| 4066 | } |
| 4067 | |
| 4068 | static int transport_generic_remove( |
| 4069 | struct se_cmd *cmd, |
| 4070 | int release_to_pool, |
| 4071 | int session_reinstatement) |
| 4072 | { |
| 4073 | unsigned long flags; |
| 4074 | |
| 4075 | if (!(T_TASK(cmd))) |
| 4076 | goto release_cmd; |
| 4077 | |
| 4078 | if (transport_dec_and_check(cmd)) { |
| 4079 | if (session_reinstatement) { |
| 4080 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 4081 | transport_all_task_dev_remove_state(cmd); |
| 4082 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, |
| 4083 | flags); |
| 4084 | } |
| 4085 | return 1; |
| 4086 | } |
| 4087 | |
| 4088 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 4089 | if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) { |
| 4090 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 4091 | goto free_pages; |
| 4092 | } |
| 4093 | atomic_set(&T_TASK(cmd)->transport_dev_active, 0); |
| 4094 | transport_all_task_dev_remove_state(cmd); |
| 4095 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 4096 | |
| 4097 | transport_release_tasks(cmd); |
| 4098 | free_pages: |
| 4099 | transport_free_pages(cmd); |
| 4100 | |
| 4101 | release_cmd: |
| 4102 | if (release_to_pool) { |
| 4103 | transport_release_cmd_to_pool(cmd); |
| 4104 | } else { |
| 4105 | transport_free_se_cmd(cmd); |
| 4106 | CMD_TFO(cmd)->release_cmd_direct(cmd); |
| 4107 | } |
| 4108 | |
| 4109 | return 0; |
| 4110 | } |
| 4111 | |
| 4112 | /* |
| 4113 | * transport_generic_map_mem_to_cmd - Perform SGL -> struct se_mem map |
| 4114 | * @cmd: Associated se_cmd descriptor |
| 4115 | * @mem: SGL style memory for TCM WRITE / READ |
| 4116 | * @sg_mem_num: Number of SGL elements |
| 4117 | * @mem_bidi_in: SGL style memory for TCM BIDI READ |
| 4118 | * @sg_mem_bidi_num: Number of BIDI READ SGL elements |
| 4119 | * |
| 4120 | * Return: nonzero return cmd was rejected for -ENOMEM or inproper usage |
| 4121 | * of parameters. |
| 4122 | */ |
| 4123 | int transport_generic_map_mem_to_cmd( |
| 4124 | struct se_cmd *cmd, |
| 4125 | struct scatterlist *mem, |
| 4126 | u32 sg_mem_num, |
| 4127 | struct scatterlist *mem_bidi_in, |
| 4128 | u32 sg_mem_bidi_num) |
| 4129 | { |
| 4130 | u32 se_mem_cnt_out = 0; |
| 4131 | int ret; |
| 4132 | |
| 4133 | if (!(mem) || !(sg_mem_num)) |
| 4134 | return 0; |
| 4135 | /* |
| 4136 | * Passed *mem will contain a list_head containing preformatted |
| 4137 | * struct se_mem elements... |
| 4138 | */ |
| 4139 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM)) { |
| 4140 | if ((mem_bidi_in) || (sg_mem_bidi_num)) { |
| 4141 | printk(KERN_ERR "SCF_CMD_PASSTHROUGH_NOALLOC not supported" |
| 4142 | " with BIDI-COMMAND\n"); |
| 4143 | return -ENOSYS; |
| 4144 | } |
| 4145 | |
| 4146 | T_TASK(cmd)->t_mem_list = (struct list_head *)mem; |
| 4147 | T_TASK(cmd)->t_tasks_se_num = sg_mem_num; |
| 4148 | cmd->se_cmd_flags |= SCF_CMD_PASSTHROUGH_NOALLOC; |
| 4149 | return 0; |
| 4150 | } |
| 4151 | /* |
| 4152 | * Otherwise, assume the caller is passing a struct scatterlist |
| 4153 | * array from include/linux/scatterlist.h |
| 4154 | */ |
| 4155 | if ((cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) || |
| 4156 | (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB)) { |
| 4157 | /* |
| 4158 | * For CDB using TCM struct se_mem linked list scatterlist memory |
| 4159 | * processed into a TCM struct se_subsystem_dev, we do the mapping |
| 4160 | * from the passed physical memory to struct se_mem->se_page here. |
| 4161 | */ |
| 4162 | T_TASK(cmd)->t_mem_list = transport_init_se_mem_list(); |
| 4163 | if (!(T_TASK(cmd)->t_mem_list)) |
| 4164 | return -ENOMEM; |
| 4165 | |
| 4166 | ret = transport_map_sg_to_mem(cmd, |
| 4167 | T_TASK(cmd)->t_mem_list, mem, &se_mem_cnt_out); |
| 4168 | if (ret < 0) |
| 4169 | return -ENOMEM; |
| 4170 | |
| 4171 | T_TASK(cmd)->t_tasks_se_num = se_mem_cnt_out; |
| 4172 | /* |
| 4173 | * Setup BIDI READ list of struct se_mem elements |
| 4174 | */ |
| 4175 | if ((mem_bidi_in) && (sg_mem_bidi_num)) { |
| 4176 | T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list(); |
| 4177 | if (!(T_TASK(cmd)->t_mem_bidi_list)) { |
| 4178 | kfree(T_TASK(cmd)->t_mem_list); |
| 4179 | return -ENOMEM; |
| 4180 | } |
| 4181 | se_mem_cnt_out = 0; |
| 4182 | |
| 4183 | ret = transport_map_sg_to_mem(cmd, |
| 4184 | T_TASK(cmd)->t_mem_bidi_list, mem_bidi_in, |
| 4185 | &se_mem_cnt_out); |
| 4186 | if (ret < 0) { |
| 4187 | kfree(T_TASK(cmd)->t_mem_list); |
| 4188 | return -ENOMEM; |
| 4189 | } |
| 4190 | |
| 4191 | T_TASK(cmd)->t_tasks_se_bidi_num = se_mem_cnt_out; |
| 4192 | } |
| 4193 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC; |
| 4194 | |
| 4195 | } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) { |
| 4196 | if (mem_bidi_in || sg_mem_bidi_num) { |
| 4197 | printk(KERN_ERR "BIDI-Commands not supported using " |
| 4198 | "SCF_SCSI_CONTROL_NONSG_IO_CDB\n"); |
| 4199 | return -ENOSYS; |
| 4200 | } |
| 4201 | /* |
| 4202 | * For incoming CDBs using a contiguous buffer internall with TCM, |
| 4203 | * save the passed struct scatterlist memory. After TCM storage object |
| 4204 | * processing has completed for this struct se_cmd, TCM core will call |
| 4205 | * transport_memcpy_[write,read]_contig() as necessary from |
| 4206 | * transport_generic_complete_ok() and transport_write_pending() in order |
| 4207 | * to copy the TCM buffer to/from the original passed *mem in SGL -> |
| 4208 | * struct scatterlist format. |
| 4209 | */ |
| 4210 | cmd->se_cmd_flags |= SCF_PASSTHROUGH_CONTIG_TO_SG; |
| 4211 | T_TASK(cmd)->t_task_pt_sgl = mem; |
| 4212 | } |
| 4213 | |
| 4214 | return 0; |
| 4215 | } |
| 4216 | EXPORT_SYMBOL(transport_generic_map_mem_to_cmd); |
| 4217 | |
| 4218 | |
| 4219 | static inline long long transport_dev_end_lba(struct se_device *dev) |
| 4220 | { |
| 4221 | return dev->transport->get_blocks(dev) + 1; |
| 4222 | } |
| 4223 | |
| 4224 | static int transport_get_sectors(struct se_cmd *cmd) |
| 4225 | { |
| 4226 | struct se_device *dev = SE_DEV(cmd); |
| 4227 | |
| 4228 | T_TASK(cmd)->t_tasks_sectors = |
| 4229 | (cmd->data_length / DEV_ATTRIB(dev)->block_size); |
| 4230 | if (!(T_TASK(cmd)->t_tasks_sectors)) |
| 4231 | T_TASK(cmd)->t_tasks_sectors = 1; |
| 4232 | |
| 4233 | if (TRANSPORT(dev)->get_device_type(dev) != TYPE_DISK) |
| 4234 | return 0; |
| 4235 | |
| 4236 | if ((T_TASK(cmd)->t_task_lba + T_TASK(cmd)->t_tasks_sectors) > |
| 4237 | transport_dev_end_lba(dev)) { |
| 4238 | printk(KERN_ERR "LBA: %llu Sectors: %u exceeds" |
| 4239 | " transport_dev_end_lba(): %llu\n", |
| 4240 | T_TASK(cmd)->t_task_lba, T_TASK(cmd)->t_tasks_sectors, |
| 4241 | transport_dev_end_lba(dev)); |
| 4242 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 4243 | cmd->scsi_sense_reason = TCM_SECTOR_COUNT_TOO_MANY; |
| 4244 | return PYX_TRANSPORT_REQ_TOO_MANY_SECTORS; |
| 4245 | } |
| 4246 | |
| 4247 | return 0; |
| 4248 | } |
| 4249 | |
| 4250 | static int transport_new_cmd_obj(struct se_cmd *cmd) |
| 4251 | { |
| 4252 | struct se_device *dev = SE_DEV(cmd); |
| 4253 | u32 task_cdbs = 0, rc; |
| 4254 | |
| 4255 | if (!(cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB)) { |
| 4256 | task_cdbs++; |
| 4257 | T_TASK(cmd)->t_task_cdbs++; |
| 4258 | } else { |
| 4259 | int set_counts = 1; |
| 4260 | |
| 4261 | /* |
| 4262 | * Setup any BIDI READ tasks and memory from |
| 4263 | * T_TASK(cmd)->t_mem_bidi_list so the READ struct se_tasks |
| 4264 | * are queued first for the non pSCSI passthrough case. |
| 4265 | */ |
| 4266 | if ((T_TASK(cmd)->t_mem_bidi_list != NULL) && |
| 4267 | (TRANSPORT(dev)->transport_type != TRANSPORT_PLUGIN_PHBA_PDEV)) { |
| 4268 | rc = transport_generic_get_cdb_count(cmd, |
| 4269 | T_TASK(cmd)->t_task_lba, |
| 4270 | T_TASK(cmd)->t_tasks_sectors, |
| 4271 | DMA_FROM_DEVICE, T_TASK(cmd)->t_mem_bidi_list, |
| 4272 | set_counts); |
| 4273 | if (!(rc)) { |
| 4274 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 4275 | cmd->scsi_sense_reason = |
| 4276 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 4277 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 4278 | } |
| 4279 | set_counts = 0; |
| 4280 | } |
| 4281 | /* |
| 4282 | * Setup the tasks and memory from T_TASK(cmd)->t_mem_list |
| 4283 | * Note for BIDI transfers this will contain the WRITE payload |
| 4284 | */ |
| 4285 | task_cdbs = transport_generic_get_cdb_count(cmd, |
| 4286 | T_TASK(cmd)->t_task_lba, |
| 4287 | T_TASK(cmd)->t_tasks_sectors, |
| 4288 | cmd->data_direction, T_TASK(cmd)->t_mem_list, |
| 4289 | set_counts); |
| 4290 | if (!(task_cdbs)) { |
| 4291 | cmd->se_cmd_flags |= SCF_SCSI_CDB_EXCEPTION; |
| 4292 | cmd->scsi_sense_reason = |
| 4293 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE; |
| 4294 | return PYX_TRANSPORT_LU_COMM_FAILURE; |
| 4295 | } |
| 4296 | T_TASK(cmd)->t_task_cdbs += task_cdbs; |
| 4297 | |
| 4298 | #if 0 |
| 4299 | printk(KERN_INFO "data_length: %u, LBA: %llu t_tasks_sectors:" |
| 4300 | " %u, t_task_cdbs: %u\n", obj_ptr, cmd->data_length, |
| 4301 | T_TASK(cmd)->t_task_lba, T_TASK(cmd)->t_tasks_sectors, |
| 4302 | T_TASK(cmd)->t_task_cdbs); |
| 4303 | #endif |
| 4304 | } |
| 4305 | |
| 4306 | atomic_set(&T_TASK(cmd)->t_task_cdbs_left, task_cdbs); |
| 4307 | atomic_set(&T_TASK(cmd)->t_task_cdbs_ex_left, task_cdbs); |
| 4308 | atomic_set(&T_TASK(cmd)->t_task_cdbs_timeout_left, task_cdbs); |
| 4309 | return 0; |
| 4310 | } |
| 4311 | |
| 4312 | static struct list_head *transport_init_se_mem_list(void) |
| 4313 | { |
| 4314 | struct list_head *se_mem_list; |
| 4315 | |
| 4316 | se_mem_list = kzalloc(sizeof(struct list_head), GFP_KERNEL); |
| 4317 | if (!(se_mem_list)) { |
| 4318 | printk(KERN_ERR "Unable to allocate memory for se_mem_list\n"); |
| 4319 | return NULL; |
| 4320 | } |
| 4321 | INIT_LIST_HEAD(se_mem_list); |
| 4322 | |
| 4323 | return se_mem_list; |
| 4324 | } |
| 4325 | |
| 4326 | static int |
| 4327 | transport_generic_get_mem(struct se_cmd *cmd, u32 length, u32 dma_size) |
| 4328 | { |
| 4329 | unsigned char *buf; |
| 4330 | struct se_mem *se_mem; |
| 4331 | |
| 4332 | T_TASK(cmd)->t_mem_list = transport_init_se_mem_list(); |
| 4333 | if (!(T_TASK(cmd)->t_mem_list)) |
| 4334 | return -ENOMEM; |
| 4335 | |
| 4336 | /* |
| 4337 | * If the device uses memory mapping this is enough. |
| 4338 | */ |
| 4339 | if (cmd->se_dev->transport->do_se_mem_map) |
| 4340 | return 0; |
| 4341 | |
| 4342 | /* |
| 4343 | * Setup BIDI-COMMAND READ list of struct se_mem elements |
| 4344 | */ |
| 4345 | if (T_TASK(cmd)->t_tasks_bidi) { |
| 4346 | T_TASK(cmd)->t_mem_bidi_list = transport_init_se_mem_list(); |
| 4347 | if (!(T_TASK(cmd)->t_mem_bidi_list)) { |
| 4348 | kfree(T_TASK(cmd)->t_mem_list); |
| 4349 | return -ENOMEM; |
| 4350 | } |
| 4351 | } |
| 4352 | |
| 4353 | while (length) { |
| 4354 | se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL); |
| 4355 | if (!(se_mem)) { |
| 4356 | printk(KERN_ERR "Unable to allocate struct se_mem\n"); |
| 4357 | goto out; |
| 4358 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4359 | |
| 4360 | /* #warning FIXME Allocate contigous pages for struct se_mem elements */ |
Jesper Juhl | 8721056 | 2011-03-14 04:06:05 -0700 | [diff] [blame] | 4361 | se_mem->se_page = alloc_pages(GFP_KERNEL, 0); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4362 | if (!(se_mem->se_page)) { |
| 4363 | printk(KERN_ERR "alloc_pages() failed\n"); |
| 4364 | goto out; |
| 4365 | } |
| 4366 | |
| 4367 | buf = kmap_atomic(se_mem->se_page, KM_IRQ0); |
| 4368 | if (!(buf)) { |
| 4369 | printk(KERN_ERR "kmap_atomic() failed\n"); |
| 4370 | goto out; |
| 4371 | } |
Jesper Juhl | 8721056 | 2011-03-14 04:06:05 -0700 | [diff] [blame] | 4372 | INIT_LIST_HEAD(&se_mem->se_list); |
| 4373 | se_mem->se_len = (length > dma_size) ? dma_size : length; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4374 | memset(buf, 0, se_mem->se_len); |
| 4375 | kunmap_atomic(buf, KM_IRQ0); |
| 4376 | |
| 4377 | list_add_tail(&se_mem->se_list, T_TASK(cmd)->t_mem_list); |
| 4378 | T_TASK(cmd)->t_tasks_se_num++; |
| 4379 | |
| 4380 | DEBUG_MEM("Allocated struct se_mem page(%p) Length(%u)" |
| 4381 | " Offset(%u)\n", se_mem->se_page, se_mem->se_len, |
| 4382 | se_mem->se_off); |
| 4383 | |
| 4384 | length -= se_mem->se_len; |
| 4385 | } |
| 4386 | |
| 4387 | DEBUG_MEM("Allocated total struct se_mem elements(%u)\n", |
| 4388 | T_TASK(cmd)->t_tasks_se_num); |
| 4389 | |
| 4390 | return 0; |
| 4391 | out: |
Jesper Juhl | 8721056 | 2011-03-14 04:06:05 -0700 | [diff] [blame] | 4392 | if (se_mem) |
| 4393 | __free_pages(se_mem->se_page, 0); |
| 4394 | kmem_cache_free(se_mem_cache, se_mem); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4395 | return -1; |
| 4396 | } |
| 4397 | |
Dan Carpenter | 5dd7ed2 | 2011-03-14 04:06:01 -0700 | [diff] [blame] | 4398 | u32 transport_calc_sg_num( |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4399 | struct se_task *task, |
| 4400 | struct se_mem *in_se_mem, |
| 4401 | u32 task_offset) |
| 4402 | { |
| 4403 | struct se_cmd *se_cmd = task->task_se_cmd; |
| 4404 | struct se_device *se_dev = SE_DEV(se_cmd); |
| 4405 | struct se_mem *se_mem = in_se_mem; |
| 4406 | struct target_core_fabric_ops *tfo = CMD_TFO(se_cmd); |
| 4407 | u32 sg_length, task_size = task->task_size, task_sg_num_padded; |
| 4408 | |
| 4409 | while (task_size != 0) { |
| 4410 | DEBUG_SC("se_mem->se_page(%p) se_mem->se_len(%u)" |
| 4411 | " se_mem->se_off(%u) task_offset(%u)\n", |
| 4412 | se_mem->se_page, se_mem->se_len, |
| 4413 | se_mem->se_off, task_offset); |
| 4414 | |
| 4415 | if (task_offset == 0) { |
| 4416 | if (task_size >= se_mem->se_len) { |
| 4417 | sg_length = se_mem->se_len; |
| 4418 | |
| 4419 | if (!(list_is_last(&se_mem->se_list, |
| 4420 | T_TASK(se_cmd)->t_mem_list))) |
| 4421 | se_mem = list_entry(se_mem->se_list.next, |
| 4422 | struct se_mem, se_list); |
| 4423 | } else { |
| 4424 | sg_length = task_size; |
| 4425 | task_size -= sg_length; |
| 4426 | goto next; |
| 4427 | } |
| 4428 | |
| 4429 | DEBUG_SC("sg_length(%u) task_size(%u)\n", |
| 4430 | sg_length, task_size); |
| 4431 | } else { |
| 4432 | if ((se_mem->se_len - task_offset) > task_size) { |
| 4433 | sg_length = task_size; |
| 4434 | task_size -= sg_length; |
| 4435 | goto next; |
| 4436 | } else { |
| 4437 | sg_length = (se_mem->se_len - task_offset); |
| 4438 | |
| 4439 | if (!(list_is_last(&se_mem->se_list, |
| 4440 | T_TASK(se_cmd)->t_mem_list))) |
| 4441 | se_mem = list_entry(se_mem->se_list.next, |
| 4442 | struct se_mem, se_list); |
| 4443 | } |
| 4444 | |
| 4445 | DEBUG_SC("sg_length(%u) task_size(%u)\n", |
| 4446 | sg_length, task_size); |
| 4447 | |
| 4448 | task_offset = 0; |
| 4449 | } |
| 4450 | task_size -= sg_length; |
| 4451 | next: |
| 4452 | DEBUG_SC("task[%u] - Reducing task_size to(%u)\n", |
| 4453 | task->task_no, task_size); |
| 4454 | |
| 4455 | task->task_sg_num++; |
| 4456 | } |
| 4457 | /* |
| 4458 | * Check if the fabric module driver is requesting that all |
| 4459 | * struct se_task->task_sg[] be chained together.. If so, |
| 4460 | * then allocate an extra padding SG entry for linking and |
| 4461 | * marking the end of the chained SGL. |
| 4462 | */ |
| 4463 | if (tfo->task_sg_chaining) { |
| 4464 | task_sg_num_padded = (task->task_sg_num + 1); |
| 4465 | task->task_padded_sg = 1; |
| 4466 | } else |
| 4467 | task_sg_num_padded = task->task_sg_num; |
| 4468 | |
| 4469 | task->task_sg = kzalloc(task_sg_num_padded * |
| 4470 | sizeof(struct scatterlist), GFP_KERNEL); |
| 4471 | if (!(task->task_sg)) { |
| 4472 | printk(KERN_ERR "Unable to allocate memory for" |
| 4473 | " task->task_sg\n"); |
| 4474 | return 0; |
| 4475 | } |
| 4476 | sg_init_table(&task->task_sg[0], task_sg_num_padded); |
| 4477 | /* |
| 4478 | * Setup task->task_sg_bidi for SCSI READ payload for |
| 4479 | * TCM/pSCSI passthrough if present for BIDI-COMMAND |
| 4480 | */ |
| 4481 | if ((T_TASK(se_cmd)->t_mem_bidi_list != NULL) && |
| 4482 | (TRANSPORT(se_dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)) { |
| 4483 | task->task_sg_bidi = kzalloc(task_sg_num_padded * |
| 4484 | sizeof(struct scatterlist), GFP_KERNEL); |
| 4485 | if (!(task->task_sg_bidi)) { |
| 4486 | printk(KERN_ERR "Unable to allocate memory for" |
| 4487 | " task->task_sg_bidi\n"); |
| 4488 | return 0; |
| 4489 | } |
| 4490 | sg_init_table(&task->task_sg_bidi[0], task_sg_num_padded); |
| 4491 | } |
| 4492 | /* |
| 4493 | * For the chaining case, setup the proper end of SGL for the |
| 4494 | * initial submission struct task into struct se_subsystem_api. |
| 4495 | * This will be cleared later by transport_do_task_sg_chain() |
| 4496 | */ |
| 4497 | if (task->task_padded_sg) { |
| 4498 | sg_mark_end(&task->task_sg[task->task_sg_num - 1]); |
| 4499 | /* |
| 4500 | * Added the 'if' check before marking end of bi-directional |
| 4501 | * scatterlist (which gets created only in case of request |
| 4502 | * (RD + WR). |
| 4503 | */ |
| 4504 | if (task->task_sg_bidi) |
| 4505 | sg_mark_end(&task->task_sg_bidi[task->task_sg_num - 1]); |
| 4506 | } |
| 4507 | |
| 4508 | DEBUG_SC("Successfully allocated task->task_sg_num(%u)," |
| 4509 | " task_sg_num_padded(%u)\n", task->task_sg_num, |
| 4510 | task_sg_num_padded); |
| 4511 | |
| 4512 | return task->task_sg_num; |
| 4513 | } |
| 4514 | |
| 4515 | static inline int transport_set_tasks_sectors_disk( |
| 4516 | struct se_task *task, |
| 4517 | struct se_device *dev, |
| 4518 | unsigned long long lba, |
| 4519 | u32 sectors, |
| 4520 | int *max_sectors_set) |
| 4521 | { |
| 4522 | if ((lba + sectors) > transport_dev_end_lba(dev)) { |
| 4523 | task->task_sectors = ((transport_dev_end_lba(dev) - lba) + 1); |
| 4524 | |
| 4525 | if (task->task_sectors > DEV_ATTRIB(dev)->max_sectors) { |
| 4526 | task->task_sectors = DEV_ATTRIB(dev)->max_sectors; |
| 4527 | *max_sectors_set = 1; |
| 4528 | } |
| 4529 | } else { |
| 4530 | if (sectors > DEV_ATTRIB(dev)->max_sectors) { |
| 4531 | task->task_sectors = DEV_ATTRIB(dev)->max_sectors; |
| 4532 | *max_sectors_set = 1; |
| 4533 | } else |
| 4534 | task->task_sectors = sectors; |
| 4535 | } |
| 4536 | |
| 4537 | return 0; |
| 4538 | } |
| 4539 | |
| 4540 | static inline int transport_set_tasks_sectors_non_disk( |
| 4541 | struct se_task *task, |
| 4542 | struct se_device *dev, |
| 4543 | unsigned long long lba, |
| 4544 | u32 sectors, |
| 4545 | int *max_sectors_set) |
| 4546 | { |
| 4547 | if (sectors > DEV_ATTRIB(dev)->max_sectors) { |
| 4548 | task->task_sectors = DEV_ATTRIB(dev)->max_sectors; |
| 4549 | *max_sectors_set = 1; |
| 4550 | } else |
| 4551 | task->task_sectors = sectors; |
| 4552 | |
| 4553 | return 0; |
| 4554 | } |
| 4555 | |
| 4556 | static inline int transport_set_tasks_sectors( |
| 4557 | struct se_task *task, |
| 4558 | struct se_device *dev, |
| 4559 | unsigned long long lba, |
| 4560 | u32 sectors, |
| 4561 | int *max_sectors_set) |
| 4562 | { |
| 4563 | return (TRANSPORT(dev)->get_device_type(dev) == TYPE_DISK) ? |
| 4564 | transport_set_tasks_sectors_disk(task, dev, lba, sectors, |
| 4565 | max_sectors_set) : |
| 4566 | transport_set_tasks_sectors_non_disk(task, dev, lba, sectors, |
| 4567 | max_sectors_set); |
| 4568 | } |
| 4569 | |
| 4570 | static int transport_map_sg_to_mem( |
| 4571 | struct se_cmd *cmd, |
| 4572 | struct list_head *se_mem_list, |
| 4573 | void *in_mem, |
| 4574 | u32 *se_mem_cnt) |
| 4575 | { |
| 4576 | struct se_mem *se_mem; |
| 4577 | struct scatterlist *sg; |
| 4578 | u32 sg_count = 1, cmd_size = cmd->data_length; |
| 4579 | |
| 4580 | if (!in_mem) { |
| 4581 | printk(KERN_ERR "No source scatterlist\n"); |
| 4582 | return -1; |
| 4583 | } |
| 4584 | sg = (struct scatterlist *)in_mem; |
| 4585 | |
| 4586 | while (cmd_size) { |
| 4587 | se_mem = kmem_cache_zalloc(se_mem_cache, GFP_KERNEL); |
| 4588 | if (!(se_mem)) { |
| 4589 | printk(KERN_ERR "Unable to allocate struct se_mem\n"); |
| 4590 | return -1; |
| 4591 | } |
| 4592 | INIT_LIST_HEAD(&se_mem->se_list); |
| 4593 | DEBUG_MEM("sg_to_mem: Starting loop with cmd_size: %u" |
| 4594 | " sg_page: %p offset: %d length: %d\n", cmd_size, |
| 4595 | sg_page(sg), sg->offset, sg->length); |
| 4596 | |
| 4597 | se_mem->se_page = sg_page(sg); |
| 4598 | se_mem->se_off = sg->offset; |
| 4599 | |
| 4600 | if (cmd_size > sg->length) { |
| 4601 | se_mem->se_len = sg->length; |
| 4602 | sg = sg_next(sg); |
| 4603 | sg_count++; |
| 4604 | } else |
| 4605 | se_mem->se_len = cmd_size; |
| 4606 | |
| 4607 | cmd_size -= se_mem->se_len; |
| 4608 | |
| 4609 | DEBUG_MEM("sg_to_mem: *se_mem_cnt: %u cmd_size: %u\n", |
| 4610 | *se_mem_cnt, cmd_size); |
| 4611 | DEBUG_MEM("sg_to_mem: Final se_page: %p se_off: %d se_len: %d\n", |
| 4612 | se_mem->se_page, se_mem->se_off, se_mem->se_len); |
| 4613 | |
| 4614 | list_add_tail(&se_mem->se_list, se_mem_list); |
| 4615 | (*se_mem_cnt)++; |
| 4616 | } |
| 4617 | |
| 4618 | DEBUG_MEM("task[0] - Mapped(%u) struct scatterlist segments to(%u)" |
| 4619 | " struct se_mem\n", sg_count, *se_mem_cnt); |
| 4620 | |
| 4621 | if (sg_count != *se_mem_cnt) |
| 4622 | BUG(); |
| 4623 | |
| 4624 | return 0; |
| 4625 | } |
| 4626 | |
| 4627 | /* transport_map_mem_to_sg(): |
| 4628 | * |
| 4629 | * |
| 4630 | */ |
| 4631 | int transport_map_mem_to_sg( |
| 4632 | struct se_task *task, |
| 4633 | struct list_head *se_mem_list, |
| 4634 | void *in_mem, |
| 4635 | struct se_mem *in_se_mem, |
| 4636 | struct se_mem **out_se_mem, |
| 4637 | u32 *se_mem_cnt, |
| 4638 | u32 *task_offset) |
| 4639 | { |
| 4640 | struct se_cmd *se_cmd = task->task_se_cmd; |
| 4641 | struct se_mem *se_mem = in_se_mem; |
| 4642 | struct scatterlist *sg = (struct scatterlist *)in_mem; |
| 4643 | u32 task_size = task->task_size, sg_no = 0; |
| 4644 | |
| 4645 | if (!sg) { |
| 4646 | printk(KERN_ERR "Unable to locate valid struct" |
| 4647 | " scatterlist pointer\n"); |
| 4648 | return -1; |
| 4649 | } |
| 4650 | |
| 4651 | while (task_size != 0) { |
| 4652 | /* |
| 4653 | * Setup the contigious array of scatterlists for |
| 4654 | * this struct se_task. |
| 4655 | */ |
| 4656 | sg_assign_page(sg, se_mem->se_page); |
| 4657 | |
| 4658 | if (*task_offset == 0) { |
| 4659 | sg->offset = se_mem->se_off; |
| 4660 | |
| 4661 | if (task_size >= se_mem->se_len) { |
| 4662 | sg->length = se_mem->se_len; |
| 4663 | |
| 4664 | if (!(list_is_last(&se_mem->se_list, |
| 4665 | T_TASK(se_cmd)->t_mem_list))) { |
| 4666 | se_mem = list_entry(se_mem->se_list.next, |
| 4667 | struct se_mem, se_list); |
| 4668 | (*se_mem_cnt)++; |
| 4669 | } |
| 4670 | } else { |
| 4671 | sg->length = task_size; |
| 4672 | /* |
| 4673 | * Determine if we need to calculate an offset |
| 4674 | * into the struct se_mem on the next go around.. |
| 4675 | */ |
| 4676 | task_size -= sg->length; |
| 4677 | if (!(task_size)) |
| 4678 | *task_offset = sg->length; |
| 4679 | |
| 4680 | goto next; |
| 4681 | } |
| 4682 | |
| 4683 | } else { |
| 4684 | sg->offset = (*task_offset + se_mem->se_off); |
| 4685 | |
| 4686 | if ((se_mem->se_len - *task_offset) > task_size) { |
| 4687 | sg->length = task_size; |
| 4688 | /* |
| 4689 | * Determine if we need to calculate an offset |
| 4690 | * into the struct se_mem on the next go around.. |
| 4691 | */ |
| 4692 | task_size -= sg->length; |
| 4693 | if (!(task_size)) |
| 4694 | *task_offset += sg->length; |
| 4695 | |
| 4696 | goto next; |
| 4697 | } else { |
| 4698 | sg->length = (se_mem->se_len - *task_offset); |
| 4699 | |
| 4700 | if (!(list_is_last(&se_mem->se_list, |
| 4701 | T_TASK(se_cmd)->t_mem_list))) { |
| 4702 | se_mem = list_entry(se_mem->se_list.next, |
| 4703 | struct se_mem, se_list); |
| 4704 | (*se_mem_cnt)++; |
| 4705 | } |
| 4706 | } |
| 4707 | |
| 4708 | *task_offset = 0; |
| 4709 | } |
| 4710 | task_size -= sg->length; |
| 4711 | next: |
| 4712 | DEBUG_MEM("task[%u] mem_to_sg - sg[%u](%p)(%u)(%u) - Reducing" |
| 4713 | " task_size to(%u), task_offset: %u\n", task->task_no, sg_no, |
| 4714 | sg_page(sg), sg->length, sg->offset, task_size, *task_offset); |
| 4715 | |
| 4716 | sg_no++; |
| 4717 | if (!(task_size)) |
| 4718 | break; |
| 4719 | |
| 4720 | sg = sg_next(sg); |
| 4721 | |
| 4722 | if (task_size > se_cmd->data_length) |
| 4723 | BUG(); |
| 4724 | } |
| 4725 | *out_se_mem = se_mem; |
| 4726 | |
| 4727 | DEBUG_MEM("task[%u] - Mapped(%u) struct se_mem segments to total(%u)" |
| 4728 | " SGs\n", task->task_no, *se_mem_cnt, sg_no); |
| 4729 | |
| 4730 | return 0; |
| 4731 | } |
| 4732 | |
| 4733 | /* |
| 4734 | * This function can be used by HW target mode drivers to create a linked |
| 4735 | * scatterlist from all contiguously allocated struct se_task->task_sg[]. |
| 4736 | * This is intended to be called during the completion path by TCM Core |
| 4737 | * when struct target_core_fabric_ops->check_task_sg_chaining is enabled. |
| 4738 | */ |
| 4739 | void transport_do_task_sg_chain(struct se_cmd *cmd) |
| 4740 | { |
| 4741 | struct scatterlist *sg_head = NULL, *sg_link = NULL, *sg_first = NULL; |
| 4742 | struct scatterlist *sg_head_cur = NULL, *sg_link_cur = NULL; |
| 4743 | struct scatterlist *sg, *sg_end = NULL, *sg_end_cur = NULL; |
| 4744 | struct se_task *task; |
| 4745 | struct target_core_fabric_ops *tfo = CMD_TFO(cmd); |
| 4746 | u32 task_sg_num = 0, sg_count = 0; |
| 4747 | int i; |
| 4748 | |
| 4749 | if (tfo->task_sg_chaining == 0) { |
| 4750 | printk(KERN_ERR "task_sg_chaining is diabled for fabric module:" |
| 4751 | " %s\n", tfo->get_fabric_name()); |
| 4752 | dump_stack(); |
| 4753 | return; |
| 4754 | } |
| 4755 | /* |
| 4756 | * Walk the struct se_task list and setup scatterlist chains |
| 4757 | * for each contiguosly allocated struct se_task->task_sg[]. |
| 4758 | */ |
| 4759 | list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) { |
| 4760 | if (!(task->task_sg) || !(task->task_padded_sg)) |
| 4761 | continue; |
| 4762 | |
| 4763 | if (sg_head && sg_link) { |
| 4764 | sg_head_cur = &task->task_sg[0]; |
| 4765 | sg_link_cur = &task->task_sg[task->task_sg_num]; |
| 4766 | /* |
| 4767 | * Either add chain or mark end of scatterlist |
| 4768 | */ |
| 4769 | if (!(list_is_last(&task->t_list, |
| 4770 | &T_TASK(cmd)->t_task_list))) { |
| 4771 | /* |
| 4772 | * Clear existing SGL termination bit set in |
| 4773 | * transport_calc_sg_num(), see sg_mark_end() |
| 4774 | */ |
| 4775 | sg_end_cur = &task->task_sg[task->task_sg_num - 1]; |
| 4776 | sg_end_cur->page_link &= ~0x02; |
| 4777 | |
| 4778 | sg_chain(sg_head, task_sg_num, sg_head_cur); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4779 | sg_count += task->task_sg_num; |
Nicholas Bellinger | 97868c8 | 2011-05-19 20:19:09 -0700 | [diff] [blame^] | 4780 | task_sg_num = (task->task_sg_num + 1); |
| 4781 | } else { |
| 4782 | sg_chain(sg_head, task_sg_num, sg_head_cur); |
| 4783 | sg_count += task->task_sg_num; |
| 4784 | task_sg_num = task->task_sg_num; |
| 4785 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4786 | |
| 4787 | sg_head = sg_head_cur; |
| 4788 | sg_link = sg_link_cur; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4789 | continue; |
| 4790 | } |
| 4791 | sg_head = sg_first = &task->task_sg[0]; |
| 4792 | sg_link = &task->task_sg[task->task_sg_num]; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4793 | /* |
| 4794 | * Check for single task.. |
| 4795 | */ |
| 4796 | if (!(list_is_last(&task->t_list, &T_TASK(cmd)->t_task_list))) { |
| 4797 | /* |
| 4798 | * Clear existing SGL termination bit set in |
| 4799 | * transport_calc_sg_num(), see sg_mark_end() |
| 4800 | */ |
| 4801 | sg_end = &task->task_sg[task->task_sg_num - 1]; |
| 4802 | sg_end->page_link &= ~0x02; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4803 | sg_count += task->task_sg_num; |
Nicholas Bellinger | 97868c8 | 2011-05-19 20:19:09 -0700 | [diff] [blame^] | 4804 | task_sg_num = (task->task_sg_num + 1); |
| 4805 | } else { |
| 4806 | sg_count += task->task_sg_num; |
| 4807 | task_sg_num = task->task_sg_num; |
| 4808 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4809 | } |
| 4810 | /* |
| 4811 | * Setup the starting pointer and total t_tasks_sg_linked_no including |
| 4812 | * padding SGs for linking and to mark the end. |
| 4813 | */ |
| 4814 | T_TASK(cmd)->t_tasks_sg_chained = sg_first; |
| 4815 | T_TASK(cmd)->t_tasks_sg_chained_no = sg_count; |
| 4816 | |
Nicholas Bellinger | 97868c8 | 2011-05-19 20:19:09 -0700 | [diff] [blame^] | 4817 | DEBUG_CMD_M("Setup cmd: %p T_TASK(cmd)->t_tasks_sg_chained: %p and" |
| 4818 | " t_tasks_sg_chained_no: %u\n", cmd, T_TASK(cmd)->t_tasks_sg_chained, |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4819 | T_TASK(cmd)->t_tasks_sg_chained_no); |
| 4820 | |
| 4821 | for_each_sg(T_TASK(cmd)->t_tasks_sg_chained, sg, |
| 4822 | T_TASK(cmd)->t_tasks_sg_chained_no, i) { |
| 4823 | |
Nicholas Bellinger | 97868c8 | 2011-05-19 20:19:09 -0700 | [diff] [blame^] | 4824 | DEBUG_CMD_M("SG[%d]: %p page: %p length: %d offset: %d, magic: 0x%08x\n", |
| 4825 | i, sg, sg_page(sg), sg->length, sg->offset, sg->sg_magic); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4826 | if (sg_is_chain(sg)) |
| 4827 | DEBUG_CMD_M("SG: %p sg_is_chain=1\n", sg); |
| 4828 | if (sg_is_last(sg)) |
| 4829 | DEBUG_CMD_M("SG: %p sg_is_last=1\n", sg); |
| 4830 | } |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4831 | } |
| 4832 | EXPORT_SYMBOL(transport_do_task_sg_chain); |
| 4833 | |
| 4834 | static int transport_do_se_mem_map( |
| 4835 | struct se_device *dev, |
| 4836 | struct se_task *task, |
| 4837 | struct list_head *se_mem_list, |
| 4838 | void *in_mem, |
| 4839 | struct se_mem *in_se_mem, |
| 4840 | struct se_mem **out_se_mem, |
| 4841 | u32 *se_mem_cnt, |
| 4842 | u32 *task_offset_in) |
| 4843 | { |
| 4844 | u32 task_offset = *task_offset_in; |
| 4845 | int ret = 0; |
| 4846 | /* |
| 4847 | * se_subsystem_api_t->do_se_mem_map is used when internal allocation |
| 4848 | * has been done by the transport plugin. |
| 4849 | */ |
| 4850 | if (TRANSPORT(dev)->do_se_mem_map) { |
| 4851 | ret = TRANSPORT(dev)->do_se_mem_map(task, se_mem_list, |
| 4852 | in_mem, in_se_mem, out_se_mem, se_mem_cnt, |
| 4853 | task_offset_in); |
| 4854 | if (ret == 0) |
| 4855 | T_TASK(task->task_se_cmd)->t_tasks_se_num += *se_mem_cnt; |
| 4856 | |
| 4857 | return ret; |
| 4858 | } |
Nicholas Bellinger | e63af95 | 2011-02-09 15:35:04 -0800 | [diff] [blame] | 4859 | |
| 4860 | BUG_ON(list_empty(se_mem_list)); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 4861 | /* |
| 4862 | * This is the normal path for all normal non BIDI and BIDI-COMMAND |
| 4863 | * WRITE payloads.. If we need to do BIDI READ passthrough for |
| 4864 | * TCM/pSCSI the first call to transport_do_se_mem_map -> |
| 4865 | * transport_calc_sg_num() -> transport_map_mem_to_sg() will do the |
| 4866 | * allocation for task->task_sg_bidi, and the subsequent call to |
| 4867 | * transport_do_se_mem_map() from transport_generic_get_cdb_count() |
| 4868 | */ |
| 4869 | if (!(task->task_sg_bidi)) { |
| 4870 | /* |
| 4871 | * Assume default that transport plugin speaks preallocated |
| 4872 | * scatterlists. |
| 4873 | */ |
| 4874 | if (!(transport_calc_sg_num(task, in_se_mem, task_offset))) |
| 4875 | return -1; |
| 4876 | /* |
| 4877 | * struct se_task->task_sg now contains the struct scatterlist array. |
| 4878 | */ |
| 4879 | return transport_map_mem_to_sg(task, se_mem_list, task->task_sg, |
| 4880 | in_se_mem, out_se_mem, se_mem_cnt, |
| 4881 | task_offset_in); |
| 4882 | } |
| 4883 | /* |
| 4884 | * Handle the se_mem_list -> struct task->task_sg_bidi |
| 4885 | * memory map for the extra BIDI READ payload |
| 4886 | */ |
| 4887 | return transport_map_mem_to_sg(task, se_mem_list, task->task_sg_bidi, |
| 4888 | in_se_mem, out_se_mem, se_mem_cnt, |
| 4889 | task_offset_in); |
| 4890 | } |
| 4891 | |
| 4892 | static u32 transport_generic_get_cdb_count( |
| 4893 | struct se_cmd *cmd, |
| 4894 | unsigned long long lba, |
| 4895 | u32 sectors, |
| 4896 | enum dma_data_direction data_direction, |
| 4897 | struct list_head *mem_list, |
| 4898 | int set_counts) |
| 4899 | { |
| 4900 | unsigned char *cdb = NULL; |
| 4901 | struct se_task *task; |
| 4902 | struct se_mem *se_mem = NULL, *se_mem_lout = NULL; |
| 4903 | struct se_mem *se_mem_bidi = NULL, *se_mem_bidi_lout = NULL; |
| 4904 | struct se_device *dev = SE_DEV(cmd); |
| 4905 | int max_sectors_set = 0, ret; |
| 4906 | u32 task_offset_in = 0, se_mem_cnt = 0, se_mem_bidi_cnt = 0, task_cdbs = 0; |
| 4907 | |
| 4908 | if (!mem_list) { |
| 4909 | printk(KERN_ERR "mem_list is NULL in transport_generic_get" |
| 4910 | "_cdb_count()\n"); |
| 4911 | return 0; |
| 4912 | } |
| 4913 | /* |
| 4914 | * While using RAMDISK_DR backstores is the only case where |
| 4915 | * mem_list will ever be empty at this point. |
| 4916 | */ |
| 4917 | if (!(list_empty(mem_list))) |
| 4918 | se_mem = list_entry(mem_list->next, struct se_mem, se_list); |
| 4919 | /* |
| 4920 | * Check for extra se_mem_bidi mapping for BIDI-COMMANDs to |
| 4921 | * struct se_task->task_sg_bidi for TCM/pSCSI passthrough operation |
| 4922 | */ |
| 4923 | if ((T_TASK(cmd)->t_mem_bidi_list != NULL) && |
| 4924 | !(list_empty(T_TASK(cmd)->t_mem_bidi_list)) && |
| 4925 | (TRANSPORT(dev)->transport_type == TRANSPORT_PLUGIN_PHBA_PDEV)) |
| 4926 | se_mem_bidi = list_entry(T_TASK(cmd)->t_mem_bidi_list->next, |
| 4927 | struct se_mem, se_list); |
| 4928 | |
| 4929 | while (sectors) { |
| 4930 | DEBUG_VOL("ITT[0x%08x] LBA(%llu) SectorsLeft(%u) EOBJ(%llu)\n", |
| 4931 | CMD_TFO(cmd)->get_task_tag(cmd), lba, sectors, |
| 4932 | transport_dev_end_lba(dev)); |
| 4933 | |
| 4934 | task = transport_generic_get_task(cmd, data_direction); |
| 4935 | if (!(task)) |
| 4936 | goto out; |
| 4937 | |
| 4938 | transport_set_tasks_sectors(task, dev, lba, sectors, |
| 4939 | &max_sectors_set); |
| 4940 | |
| 4941 | task->task_lba = lba; |
| 4942 | lba += task->task_sectors; |
| 4943 | sectors -= task->task_sectors; |
| 4944 | task->task_size = (task->task_sectors * |
| 4945 | DEV_ATTRIB(dev)->block_size); |
| 4946 | |
| 4947 | cdb = TRANSPORT(dev)->get_cdb(task); |
| 4948 | if ((cdb)) { |
| 4949 | memcpy(cdb, T_TASK(cmd)->t_task_cdb, |
| 4950 | scsi_command_size(T_TASK(cmd)->t_task_cdb)); |
| 4951 | cmd->transport_split_cdb(task->task_lba, |
| 4952 | &task->task_sectors, cdb); |
| 4953 | } |
| 4954 | |
| 4955 | /* |
| 4956 | * Perform the SE OBJ plugin and/or Transport plugin specific |
| 4957 | * mapping for T_TASK(cmd)->t_mem_list. And setup the |
| 4958 | * task->task_sg and if necessary task->task_sg_bidi |
| 4959 | */ |
| 4960 | ret = transport_do_se_mem_map(dev, task, mem_list, |
| 4961 | NULL, se_mem, &se_mem_lout, &se_mem_cnt, |
| 4962 | &task_offset_in); |
| 4963 | if (ret < 0) |
| 4964 | goto out; |
| 4965 | |
| 4966 | se_mem = se_mem_lout; |
| 4967 | /* |
| 4968 | * Setup the T_TASK(cmd)->t_mem_bidi_list -> task->task_sg_bidi |
| 4969 | * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI |
| 4970 | * |
| 4971 | * Note that the first call to transport_do_se_mem_map() above will |
| 4972 | * allocate struct se_task->task_sg_bidi in transport_do_se_mem_map() |
| 4973 | * -> transport_calc_sg_num(), and the second here will do the |
| 4974 | * mapping for SCSI READ for BIDI-COMMAND passthrough with TCM/pSCSI. |
| 4975 | */ |
| 4976 | if (task->task_sg_bidi != NULL) { |
| 4977 | ret = transport_do_se_mem_map(dev, task, |
| 4978 | T_TASK(cmd)->t_mem_bidi_list, NULL, |
| 4979 | se_mem_bidi, &se_mem_bidi_lout, &se_mem_bidi_cnt, |
| 4980 | &task_offset_in); |
| 4981 | if (ret < 0) |
| 4982 | goto out; |
| 4983 | |
| 4984 | se_mem_bidi = se_mem_bidi_lout; |
| 4985 | } |
| 4986 | task_cdbs++; |
| 4987 | |
| 4988 | DEBUG_VOL("Incremented task_cdbs(%u) task->task_sg_num(%u)\n", |
| 4989 | task_cdbs, task->task_sg_num); |
| 4990 | |
| 4991 | if (max_sectors_set) { |
| 4992 | max_sectors_set = 0; |
| 4993 | continue; |
| 4994 | } |
| 4995 | |
| 4996 | if (!sectors) |
| 4997 | break; |
| 4998 | } |
| 4999 | |
| 5000 | if (set_counts) { |
| 5001 | atomic_inc(&T_TASK(cmd)->t_fe_count); |
| 5002 | atomic_inc(&T_TASK(cmd)->t_se_count); |
| 5003 | } |
| 5004 | |
| 5005 | DEBUG_VOL("ITT[0x%08x] total %s cdbs(%u)\n", |
| 5006 | CMD_TFO(cmd)->get_task_tag(cmd), (data_direction == DMA_TO_DEVICE) |
| 5007 | ? "DMA_TO_DEVICE" : "DMA_FROM_DEVICE", task_cdbs); |
| 5008 | |
| 5009 | return task_cdbs; |
| 5010 | out: |
| 5011 | return 0; |
| 5012 | } |
| 5013 | |
| 5014 | static int |
| 5015 | transport_map_control_cmd_to_task(struct se_cmd *cmd) |
| 5016 | { |
| 5017 | struct se_device *dev = SE_DEV(cmd); |
| 5018 | unsigned char *cdb; |
| 5019 | struct se_task *task; |
| 5020 | int ret; |
| 5021 | |
| 5022 | task = transport_generic_get_task(cmd, cmd->data_direction); |
| 5023 | if (!task) |
| 5024 | return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; |
| 5025 | |
| 5026 | cdb = TRANSPORT(dev)->get_cdb(task); |
| 5027 | if (cdb) |
| 5028 | memcpy(cdb, cmd->t_task->t_task_cdb, |
| 5029 | scsi_command_size(cmd->t_task->t_task_cdb)); |
| 5030 | |
| 5031 | task->task_size = cmd->data_length; |
| 5032 | task->task_sg_num = |
| 5033 | (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) ? 1 : 0; |
| 5034 | |
| 5035 | atomic_inc(&cmd->t_task->t_fe_count); |
| 5036 | atomic_inc(&cmd->t_task->t_se_count); |
| 5037 | |
| 5038 | if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_SG_IO_CDB) { |
| 5039 | struct se_mem *se_mem = NULL, *se_mem_lout = NULL; |
| 5040 | u32 se_mem_cnt = 0, task_offset = 0; |
| 5041 | |
Nicholas Bellinger | e63af95 | 2011-02-09 15:35:04 -0800 | [diff] [blame] | 5042 | if (!list_empty(T_TASK(cmd)->t_mem_list)) |
| 5043 | se_mem = list_entry(T_TASK(cmd)->t_mem_list->next, |
| 5044 | struct se_mem, se_list); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 5045 | |
| 5046 | ret = transport_do_se_mem_map(dev, task, |
| 5047 | cmd->t_task->t_mem_list, NULL, se_mem, |
| 5048 | &se_mem_lout, &se_mem_cnt, &task_offset); |
| 5049 | if (ret < 0) |
| 5050 | return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; |
| 5051 | |
| 5052 | if (dev->transport->map_task_SG) |
| 5053 | return dev->transport->map_task_SG(task); |
| 5054 | return 0; |
| 5055 | } else if (cmd->se_cmd_flags & SCF_SCSI_CONTROL_NONSG_IO_CDB) { |
| 5056 | if (dev->transport->map_task_non_SG) |
| 5057 | return dev->transport->map_task_non_SG(task); |
| 5058 | return 0; |
| 5059 | } else if (cmd->se_cmd_flags & SCF_SCSI_NON_DATA_CDB) { |
| 5060 | if (dev->transport->cdb_none) |
| 5061 | return dev->transport->cdb_none(task); |
| 5062 | return 0; |
| 5063 | } else { |
| 5064 | BUG(); |
| 5065 | return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; |
| 5066 | } |
| 5067 | } |
| 5068 | |
| 5069 | /* transport_generic_new_cmd(): Called from transport_processing_thread() |
| 5070 | * |
| 5071 | * Allocate storage transport resources from a set of values predefined |
| 5072 | * by transport_generic_cmd_sequencer() from the iSCSI Target RX process. |
| 5073 | * Any non zero return here is treated as an "out of resource' op here. |
| 5074 | */ |
| 5075 | /* |
| 5076 | * Generate struct se_task(s) and/or their payloads for this CDB. |
| 5077 | */ |
| 5078 | static int transport_generic_new_cmd(struct se_cmd *cmd) |
| 5079 | { |
| 5080 | struct se_portal_group *se_tpg; |
| 5081 | struct se_task *task; |
| 5082 | struct se_device *dev = SE_DEV(cmd); |
| 5083 | int ret = 0; |
| 5084 | |
| 5085 | /* |
| 5086 | * Determine is the TCM fabric module has already allocated physical |
| 5087 | * memory, and is directly calling transport_generic_map_mem_to_cmd() |
| 5088 | * to setup beforehand the linked list of physical memory at |
| 5089 | * T_TASK(cmd)->t_mem_list of struct se_mem->se_page |
| 5090 | */ |
| 5091 | if (!(cmd->se_cmd_flags & SCF_PASSTHROUGH_SG_TO_MEM_NOALLOC)) { |
| 5092 | ret = transport_allocate_resources(cmd); |
| 5093 | if (ret < 0) |
| 5094 | return ret; |
| 5095 | } |
| 5096 | |
| 5097 | ret = transport_get_sectors(cmd); |
| 5098 | if (ret < 0) |
| 5099 | return ret; |
| 5100 | |
| 5101 | ret = transport_new_cmd_obj(cmd); |
| 5102 | if (ret < 0) |
| 5103 | return ret; |
| 5104 | |
| 5105 | /* |
| 5106 | * Determine if the calling TCM fabric module is talking to |
| 5107 | * Linux/NET via kernel sockets and needs to allocate a |
| 5108 | * struct iovec array to complete the struct se_cmd |
| 5109 | */ |
| 5110 | se_tpg = SE_LUN(cmd)->lun_sep->sep_tpg; |
| 5111 | if (TPG_TFO(se_tpg)->alloc_cmd_iovecs != NULL) { |
| 5112 | ret = TPG_TFO(se_tpg)->alloc_cmd_iovecs(cmd); |
| 5113 | if (ret < 0) |
| 5114 | return PYX_TRANSPORT_OUT_OF_MEMORY_RESOURCES; |
| 5115 | } |
| 5116 | |
| 5117 | if (cmd->se_cmd_flags & SCF_SCSI_DATA_SG_IO_CDB) { |
| 5118 | list_for_each_entry(task, &T_TASK(cmd)->t_task_list, t_list) { |
| 5119 | if (atomic_read(&task->task_sent)) |
| 5120 | continue; |
| 5121 | if (!dev->transport->map_task_SG) |
| 5122 | continue; |
| 5123 | |
| 5124 | ret = dev->transport->map_task_SG(task); |
| 5125 | if (ret < 0) |
| 5126 | return ret; |
| 5127 | } |
| 5128 | } else { |
| 5129 | ret = transport_map_control_cmd_to_task(cmd); |
| 5130 | if (ret < 0) |
| 5131 | return ret; |
| 5132 | } |
| 5133 | |
| 5134 | /* |
| 5135 | * For WRITEs, let the iSCSI Target RX Thread know its buffer is ready.. |
| 5136 | * This WRITE struct se_cmd (and all of its associated struct se_task's) |
| 5137 | * will be added to the struct se_device execution queue after its WRITE |
| 5138 | * data has arrived. (ie: It gets handled by the transport processing |
| 5139 | * thread a second time) |
| 5140 | */ |
| 5141 | if (cmd->data_direction == DMA_TO_DEVICE) { |
| 5142 | transport_add_tasks_to_state_queue(cmd); |
| 5143 | return transport_generic_write_pending(cmd); |
| 5144 | } |
| 5145 | /* |
| 5146 | * Everything else but a WRITE, add the struct se_cmd's struct se_task's |
| 5147 | * to the execution queue. |
| 5148 | */ |
| 5149 | transport_execute_tasks(cmd); |
| 5150 | return 0; |
| 5151 | } |
| 5152 | |
| 5153 | /* transport_generic_process_write(): |
| 5154 | * |
| 5155 | * |
| 5156 | */ |
| 5157 | void transport_generic_process_write(struct se_cmd *cmd) |
| 5158 | { |
| 5159 | #if 0 |
| 5160 | /* |
| 5161 | * Copy SCSI Presented DTL sector(s) from received buffers allocated to |
| 5162 | * original EDTL |
| 5163 | */ |
| 5164 | if (cmd->se_cmd_flags & SCF_UNDERFLOW_BIT) { |
| 5165 | if (!T_TASK(cmd)->t_tasks_se_num) { |
| 5166 | unsigned char *dst, *buf = |
| 5167 | (unsigned char *)T_TASK(cmd)->t_task_buf; |
| 5168 | |
| 5169 | dst = kzalloc(cmd->cmd_spdtl), GFP_KERNEL); |
| 5170 | if (!(dst)) { |
| 5171 | printk(KERN_ERR "Unable to allocate memory for" |
| 5172 | " WRITE underflow\n"); |
| 5173 | transport_generic_request_failure(cmd, NULL, |
| 5174 | PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1); |
| 5175 | return; |
| 5176 | } |
| 5177 | memcpy(dst, buf, cmd->cmd_spdtl); |
| 5178 | |
| 5179 | kfree(T_TASK(cmd)->t_task_buf); |
| 5180 | T_TASK(cmd)->t_task_buf = dst; |
| 5181 | } else { |
| 5182 | struct scatterlist *sg = |
| 5183 | (struct scatterlist *sg)T_TASK(cmd)->t_task_buf; |
| 5184 | struct scatterlist *orig_sg; |
| 5185 | |
| 5186 | orig_sg = kzalloc(sizeof(struct scatterlist) * |
| 5187 | T_TASK(cmd)->t_tasks_se_num, |
| 5188 | GFP_KERNEL))) { |
| 5189 | if (!(orig_sg)) { |
| 5190 | printk(KERN_ERR "Unable to allocate memory" |
| 5191 | " for WRITE underflow\n"); |
| 5192 | transport_generic_request_failure(cmd, NULL, |
| 5193 | PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1); |
| 5194 | return; |
| 5195 | } |
| 5196 | |
| 5197 | memcpy(orig_sg, T_TASK(cmd)->t_task_buf, |
| 5198 | sizeof(struct scatterlist) * |
| 5199 | T_TASK(cmd)->t_tasks_se_num); |
| 5200 | |
| 5201 | cmd->data_length = cmd->cmd_spdtl; |
| 5202 | /* |
| 5203 | * FIXME, clear out original struct se_task and state |
| 5204 | * information. |
| 5205 | */ |
| 5206 | if (transport_generic_new_cmd(cmd) < 0) { |
| 5207 | transport_generic_request_failure(cmd, NULL, |
| 5208 | PYX_TRANSPORT_REQ_TOO_MANY_SECTORS, 1); |
| 5209 | kfree(orig_sg); |
| 5210 | return; |
| 5211 | } |
| 5212 | |
| 5213 | transport_memcpy_write_sg(cmd, orig_sg); |
| 5214 | } |
| 5215 | } |
| 5216 | #endif |
| 5217 | transport_execute_tasks(cmd); |
| 5218 | } |
| 5219 | EXPORT_SYMBOL(transport_generic_process_write); |
| 5220 | |
| 5221 | /* transport_generic_write_pending(): |
| 5222 | * |
| 5223 | * |
| 5224 | */ |
| 5225 | static int transport_generic_write_pending(struct se_cmd *cmd) |
| 5226 | { |
| 5227 | unsigned long flags; |
| 5228 | int ret; |
| 5229 | |
| 5230 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 5231 | cmd->t_state = TRANSPORT_WRITE_PENDING; |
| 5232 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 5233 | /* |
| 5234 | * For the TCM control CDBs using a contiguous buffer, do the memcpy |
| 5235 | * from the passed Linux/SCSI struct scatterlist located at |
| 5236 | * T_TASK(se_cmd)->t_task_pt_buf to the contiguous buffer at |
| 5237 | * T_TASK(se_cmd)->t_task_buf. |
| 5238 | */ |
| 5239 | if (cmd->se_cmd_flags & SCF_PASSTHROUGH_CONTIG_TO_SG) |
| 5240 | transport_memcpy_read_contig(cmd, |
| 5241 | T_TASK(cmd)->t_task_buf, |
| 5242 | T_TASK(cmd)->t_task_pt_sgl); |
| 5243 | /* |
| 5244 | * Clear the se_cmd for WRITE_PENDING status in order to set |
| 5245 | * T_TASK(cmd)->t_transport_active=0 so that transport_generic_handle_data |
| 5246 | * can be called from HW target mode interrupt code. This is safe |
| 5247 | * to be called with transport_off=1 before the CMD_TFO(cmd)->write_pending |
| 5248 | * because the se_cmd->se_lun pointer is not being cleared. |
| 5249 | */ |
| 5250 | transport_cmd_check_stop(cmd, 1, 0); |
| 5251 | |
| 5252 | /* |
| 5253 | * Call the fabric write_pending function here to let the |
| 5254 | * frontend know that WRITE buffers are ready. |
| 5255 | */ |
| 5256 | ret = CMD_TFO(cmd)->write_pending(cmd); |
| 5257 | if (ret < 0) |
| 5258 | return ret; |
| 5259 | |
| 5260 | return PYX_TRANSPORT_WRITE_PENDING; |
| 5261 | } |
| 5262 | |
| 5263 | /* transport_release_cmd_to_pool(): |
| 5264 | * |
| 5265 | * |
| 5266 | */ |
| 5267 | void transport_release_cmd_to_pool(struct se_cmd *cmd) |
| 5268 | { |
| 5269 | BUG_ON(!T_TASK(cmd)); |
| 5270 | BUG_ON(!CMD_TFO(cmd)); |
| 5271 | |
| 5272 | transport_free_se_cmd(cmd); |
| 5273 | CMD_TFO(cmd)->release_cmd_to_pool(cmd); |
| 5274 | } |
| 5275 | EXPORT_SYMBOL(transport_release_cmd_to_pool); |
| 5276 | |
| 5277 | /* transport_generic_free_cmd(): |
| 5278 | * |
| 5279 | * Called from processing frontend to release storage engine resources |
| 5280 | */ |
| 5281 | void transport_generic_free_cmd( |
| 5282 | struct se_cmd *cmd, |
| 5283 | int wait_for_tasks, |
| 5284 | int release_to_pool, |
| 5285 | int session_reinstatement) |
| 5286 | { |
| 5287 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) || !T_TASK(cmd)) |
| 5288 | transport_release_cmd_to_pool(cmd); |
| 5289 | else { |
| 5290 | core_dec_lacl_count(cmd->se_sess->se_node_acl, cmd); |
| 5291 | |
| 5292 | if (SE_LUN(cmd)) { |
| 5293 | #if 0 |
| 5294 | printk(KERN_INFO "cmd: %p ITT: 0x%08x contains" |
| 5295 | " SE_LUN(cmd)\n", cmd, |
| 5296 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5297 | #endif |
| 5298 | transport_lun_remove_cmd(cmd); |
| 5299 | } |
| 5300 | |
| 5301 | if (wait_for_tasks && cmd->transport_wait_for_tasks) |
| 5302 | cmd->transport_wait_for_tasks(cmd, 0, 0); |
| 5303 | |
| 5304 | transport_generic_remove(cmd, release_to_pool, |
| 5305 | session_reinstatement); |
| 5306 | } |
| 5307 | } |
| 5308 | EXPORT_SYMBOL(transport_generic_free_cmd); |
| 5309 | |
| 5310 | static void transport_nop_wait_for_tasks( |
| 5311 | struct se_cmd *cmd, |
| 5312 | int remove_cmd, |
| 5313 | int session_reinstatement) |
| 5314 | { |
| 5315 | return; |
| 5316 | } |
| 5317 | |
| 5318 | /* transport_lun_wait_for_tasks(): |
| 5319 | * |
| 5320 | * Called from ConfigFS context to stop the passed struct se_cmd to allow |
| 5321 | * an struct se_lun to be successfully shutdown. |
| 5322 | */ |
| 5323 | static int transport_lun_wait_for_tasks(struct se_cmd *cmd, struct se_lun *lun) |
| 5324 | { |
| 5325 | unsigned long flags; |
| 5326 | int ret; |
| 5327 | /* |
| 5328 | * If the frontend has already requested this struct se_cmd to |
| 5329 | * be stopped, we can safely ignore this struct se_cmd. |
| 5330 | */ |
| 5331 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 5332 | if (atomic_read(&T_TASK(cmd)->t_transport_stop)) { |
| 5333 | atomic_set(&T_TASK(cmd)->transport_lun_stop, 0); |
| 5334 | DEBUG_TRANSPORT_S("ConfigFS ITT[0x%08x] - t_transport_stop ==" |
| 5335 | " TRUE, skipping\n", CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5336 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 5337 | transport_cmd_check_stop(cmd, 1, 0); |
| 5338 | return -1; |
| 5339 | } |
| 5340 | atomic_set(&T_TASK(cmd)->transport_lun_fe_stop, 1); |
| 5341 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 5342 | |
| 5343 | wake_up_interruptible(&SE_DEV(cmd)->dev_queue_obj->thread_wq); |
| 5344 | |
| 5345 | ret = transport_stop_tasks_for_cmd(cmd); |
| 5346 | |
| 5347 | DEBUG_TRANSPORT_S("ConfigFS: cmd: %p t_task_cdbs: %d stop tasks ret:" |
| 5348 | " %d\n", cmd, T_TASK(cmd)->t_task_cdbs, ret); |
| 5349 | if (!ret) { |
| 5350 | DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopping cmd....\n", |
| 5351 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5352 | wait_for_completion(&T_TASK(cmd)->transport_lun_stop_comp); |
| 5353 | DEBUG_TRANSPORT_S("ConfigFS: ITT[0x%08x] - stopped cmd....\n", |
| 5354 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5355 | } |
| 5356 | transport_remove_cmd_from_queue(cmd, SE_DEV(cmd)->dev_queue_obj); |
| 5357 | |
| 5358 | return 0; |
| 5359 | } |
| 5360 | |
| 5361 | /* #define DEBUG_CLEAR_LUN */ |
| 5362 | #ifdef DEBUG_CLEAR_LUN |
| 5363 | #define DEBUG_CLEAR_L(x...) printk(KERN_INFO x) |
| 5364 | #else |
| 5365 | #define DEBUG_CLEAR_L(x...) |
| 5366 | #endif |
| 5367 | |
| 5368 | static void __transport_clear_lun_from_sessions(struct se_lun *lun) |
| 5369 | { |
| 5370 | struct se_cmd *cmd = NULL; |
| 5371 | unsigned long lun_flags, cmd_flags; |
| 5372 | /* |
| 5373 | * Do exception processing and return CHECK_CONDITION status to the |
| 5374 | * Initiator Port. |
| 5375 | */ |
| 5376 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
| 5377 | while (!list_empty_careful(&lun->lun_cmd_list)) { |
| 5378 | cmd = list_entry(lun->lun_cmd_list.next, |
| 5379 | struct se_cmd, se_lun_list); |
| 5380 | list_del(&cmd->se_lun_list); |
| 5381 | |
| 5382 | if (!(T_TASK(cmd))) { |
| 5383 | printk(KERN_ERR "ITT: 0x%08x, T_TASK(cmd) = NULL" |
| 5384 | "[i,t]_state: %u/%u\n", |
| 5385 | CMD_TFO(cmd)->get_task_tag(cmd), |
| 5386 | CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state); |
| 5387 | BUG(); |
| 5388 | } |
| 5389 | atomic_set(&T_TASK(cmd)->transport_lun_active, 0); |
| 5390 | /* |
| 5391 | * This will notify iscsi_target_transport.c: |
| 5392 | * transport_cmd_check_stop() that a LUN shutdown is in |
| 5393 | * progress for the iscsi_cmd_t. |
| 5394 | */ |
| 5395 | spin_lock(&T_TASK(cmd)->t_state_lock); |
| 5396 | DEBUG_CLEAR_L("SE_LUN[%d] - Setting T_TASK(cmd)->transport" |
| 5397 | "_lun_stop for ITT: 0x%08x\n", |
| 5398 | SE_LUN(cmd)->unpacked_lun, |
| 5399 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5400 | atomic_set(&T_TASK(cmd)->transport_lun_stop, 1); |
| 5401 | spin_unlock(&T_TASK(cmd)->t_state_lock); |
| 5402 | |
| 5403 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); |
| 5404 | |
| 5405 | if (!(SE_LUN(cmd))) { |
| 5406 | printk(KERN_ERR "ITT: 0x%08x, [i,t]_state: %u/%u\n", |
| 5407 | CMD_TFO(cmd)->get_task_tag(cmd), |
| 5408 | CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state); |
| 5409 | BUG(); |
| 5410 | } |
| 5411 | /* |
| 5412 | * If the Storage engine still owns the iscsi_cmd_t, determine |
| 5413 | * and/or stop its context. |
| 5414 | */ |
| 5415 | DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x before transport" |
| 5416 | "_lun_wait_for_tasks()\n", SE_LUN(cmd)->unpacked_lun, |
| 5417 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5418 | |
| 5419 | if (transport_lun_wait_for_tasks(cmd, SE_LUN(cmd)) < 0) { |
| 5420 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
| 5421 | continue; |
| 5422 | } |
| 5423 | |
| 5424 | DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x after transport_lun" |
| 5425 | "_wait_for_tasks(): SUCCESS\n", |
| 5426 | SE_LUN(cmd)->unpacked_lun, |
| 5427 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5428 | |
| 5429 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, cmd_flags); |
| 5430 | if (!(atomic_read(&T_TASK(cmd)->transport_dev_active))) { |
| 5431 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags); |
| 5432 | goto check_cond; |
| 5433 | } |
| 5434 | atomic_set(&T_TASK(cmd)->transport_dev_active, 0); |
| 5435 | transport_all_task_dev_remove_state(cmd); |
| 5436 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags); |
| 5437 | |
| 5438 | transport_free_dev_tasks(cmd); |
| 5439 | /* |
| 5440 | * The Storage engine stopped this struct se_cmd before it was |
| 5441 | * send to the fabric frontend for delivery back to the |
| 5442 | * Initiator Node. Return this SCSI CDB back with an |
| 5443 | * CHECK_CONDITION status. |
| 5444 | */ |
| 5445 | check_cond: |
| 5446 | transport_send_check_condition_and_sense(cmd, |
| 5447 | TCM_NON_EXISTENT_LUN, 0); |
| 5448 | /* |
| 5449 | * If the fabric frontend is waiting for this iscsi_cmd_t to |
| 5450 | * be released, notify the waiting thread now that LU has |
| 5451 | * finished accessing it. |
| 5452 | */ |
| 5453 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, cmd_flags); |
| 5454 | if (atomic_read(&T_TASK(cmd)->transport_lun_fe_stop)) { |
| 5455 | DEBUG_CLEAR_L("SE_LUN[%d] - Detected FE stop for" |
| 5456 | " struct se_cmd: %p ITT: 0x%08x\n", |
| 5457 | lun->unpacked_lun, |
| 5458 | cmd, CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5459 | |
| 5460 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, |
| 5461 | cmd_flags); |
| 5462 | transport_cmd_check_stop(cmd, 1, 0); |
| 5463 | complete(&T_TASK(cmd)->transport_lun_fe_stop_comp); |
| 5464 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
| 5465 | continue; |
| 5466 | } |
| 5467 | DEBUG_CLEAR_L("SE_LUN[%d] - ITT: 0x%08x finished processing\n", |
| 5468 | lun->unpacked_lun, CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5469 | |
| 5470 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, cmd_flags); |
| 5471 | spin_lock_irqsave(&lun->lun_cmd_lock, lun_flags); |
| 5472 | } |
| 5473 | spin_unlock_irqrestore(&lun->lun_cmd_lock, lun_flags); |
| 5474 | } |
| 5475 | |
| 5476 | static int transport_clear_lun_thread(void *p) |
| 5477 | { |
| 5478 | struct se_lun *lun = (struct se_lun *)p; |
| 5479 | |
| 5480 | __transport_clear_lun_from_sessions(lun); |
| 5481 | complete(&lun->lun_shutdown_comp); |
| 5482 | |
| 5483 | return 0; |
| 5484 | } |
| 5485 | |
| 5486 | int transport_clear_lun_from_sessions(struct se_lun *lun) |
| 5487 | { |
| 5488 | struct task_struct *kt; |
| 5489 | |
| 5490 | kt = kthread_run(transport_clear_lun_thread, (void *)lun, |
| 5491 | "tcm_cl_%u", lun->unpacked_lun); |
| 5492 | if (IS_ERR(kt)) { |
| 5493 | printk(KERN_ERR "Unable to start clear_lun thread\n"); |
| 5494 | return -1; |
| 5495 | } |
| 5496 | wait_for_completion(&lun->lun_shutdown_comp); |
| 5497 | |
| 5498 | return 0; |
| 5499 | } |
| 5500 | |
| 5501 | /* transport_generic_wait_for_tasks(): |
| 5502 | * |
| 5503 | * Called from frontend or passthrough context to wait for storage engine |
| 5504 | * to pause and/or release frontend generated struct se_cmd. |
| 5505 | */ |
| 5506 | static void transport_generic_wait_for_tasks( |
| 5507 | struct se_cmd *cmd, |
| 5508 | int remove_cmd, |
| 5509 | int session_reinstatement) |
| 5510 | { |
| 5511 | unsigned long flags; |
| 5512 | |
| 5513 | if (!(cmd->se_cmd_flags & SCF_SE_LUN_CMD) && !(cmd->se_tmr_req)) |
| 5514 | return; |
| 5515 | |
| 5516 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 5517 | /* |
| 5518 | * If we are already stopped due to an external event (ie: LUN shutdown) |
| 5519 | * sleep until the connection can have the passed struct se_cmd back. |
| 5520 | * The T_TASK(cmd)->transport_lun_stopped_sem will be upped by |
| 5521 | * transport_clear_lun_from_sessions() once the ConfigFS context caller |
| 5522 | * has completed its operation on the struct se_cmd. |
| 5523 | */ |
| 5524 | if (atomic_read(&T_TASK(cmd)->transport_lun_stop)) { |
| 5525 | |
| 5526 | DEBUG_TRANSPORT_S("wait_for_tasks: Stopping" |
| 5527 | " wait_for_completion(&T_TASK(cmd)transport_lun_fe" |
| 5528 | "_stop_comp); for ITT: 0x%08x\n", |
| 5529 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5530 | /* |
| 5531 | * There is a special case for WRITES where a FE exception + |
| 5532 | * LUN shutdown means ConfigFS context is still sleeping on |
| 5533 | * transport_lun_stop_comp in transport_lun_wait_for_tasks(). |
| 5534 | * We go ahead and up transport_lun_stop_comp just to be sure |
| 5535 | * here. |
| 5536 | */ |
| 5537 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 5538 | complete(&T_TASK(cmd)->transport_lun_stop_comp); |
| 5539 | wait_for_completion(&T_TASK(cmd)->transport_lun_fe_stop_comp); |
| 5540 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 5541 | |
| 5542 | transport_all_task_dev_remove_state(cmd); |
| 5543 | /* |
| 5544 | * At this point, the frontend who was the originator of this |
| 5545 | * struct se_cmd, now owns the structure and can be released through |
| 5546 | * normal means below. |
| 5547 | */ |
| 5548 | DEBUG_TRANSPORT_S("wait_for_tasks: Stopped" |
| 5549 | " wait_for_completion(&T_TASK(cmd)transport_lun_fe_" |
| 5550 | "stop_comp); for ITT: 0x%08x\n", |
| 5551 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5552 | |
| 5553 | atomic_set(&T_TASK(cmd)->transport_lun_stop, 0); |
| 5554 | } |
Nicholas Bellinger | 52208ae | 2011-02-24 16:58:20 -0800 | [diff] [blame] | 5555 | if (!atomic_read(&T_TASK(cmd)->t_transport_active) || |
| 5556 | atomic_read(&T_TASK(cmd)->t_transport_aborted)) |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 5557 | goto remove; |
| 5558 | |
| 5559 | atomic_set(&T_TASK(cmd)->t_transport_stop, 1); |
| 5560 | |
| 5561 | DEBUG_TRANSPORT_S("wait_for_tasks: Stopping %p ITT: 0x%08x" |
| 5562 | " i_state: %d, t_state/def_t_state: %d/%d, t_transport_stop" |
| 5563 | " = TRUE\n", cmd, CMD_TFO(cmd)->get_task_tag(cmd), |
| 5564 | CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state, |
| 5565 | cmd->deferred_t_state); |
| 5566 | |
| 5567 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 5568 | |
| 5569 | wake_up_interruptible(&SE_DEV(cmd)->dev_queue_obj->thread_wq); |
| 5570 | |
| 5571 | wait_for_completion(&T_TASK(cmd)->t_transport_stop_comp); |
| 5572 | |
| 5573 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 5574 | atomic_set(&T_TASK(cmd)->t_transport_active, 0); |
| 5575 | atomic_set(&T_TASK(cmd)->t_transport_stop, 0); |
| 5576 | |
| 5577 | DEBUG_TRANSPORT_S("wait_for_tasks: Stopped wait_for_compltion(" |
| 5578 | "&T_TASK(cmd)->t_transport_stop_comp) for ITT: 0x%08x\n", |
| 5579 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5580 | remove: |
| 5581 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 5582 | if (!remove_cmd) |
| 5583 | return; |
| 5584 | |
| 5585 | transport_generic_free_cmd(cmd, 0, 0, session_reinstatement); |
| 5586 | } |
| 5587 | |
| 5588 | static int transport_get_sense_codes( |
| 5589 | struct se_cmd *cmd, |
| 5590 | u8 *asc, |
| 5591 | u8 *ascq) |
| 5592 | { |
| 5593 | *asc = cmd->scsi_asc; |
| 5594 | *ascq = cmd->scsi_ascq; |
| 5595 | |
| 5596 | return 0; |
| 5597 | } |
| 5598 | |
| 5599 | static int transport_set_sense_codes( |
| 5600 | struct se_cmd *cmd, |
| 5601 | u8 asc, |
| 5602 | u8 ascq) |
| 5603 | { |
| 5604 | cmd->scsi_asc = asc; |
| 5605 | cmd->scsi_ascq = ascq; |
| 5606 | |
| 5607 | return 0; |
| 5608 | } |
| 5609 | |
| 5610 | int transport_send_check_condition_and_sense( |
| 5611 | struct se_cmd *cmd, |
| 5612 | u8 reason, |
| 5613 | int from_transport) |
| 5614 | { |
| 5615 | unsigned char *buffer = cmd->sense_buffer; |
| 5616 | unsigned long flags; |
| 5617 | int offset; |
| 5618 | u8 asc = 0, ascq = 0; |
| 5619 | |
| 5620 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 5621 | if (cmd->se_cmd_flags & SCF_SENT_CHECK_CONDITION) { |
| 5622 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 5623 | return 0; |
| 5624 | } |
| 5625 | cmd->se_cmd_flags |= SCF_SENT_CHECK_CONDITION; |
| 5626 | spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); |
| 5627 | |
| 5628 | if (!reason && from_transport) |
| 5629 | goto after_reason; |
| 5630 | |
| 5631 | if (!from_transport) |
| 5632 | cmd->se_cmd_flags |= SCF_EMULATED_TASK_SENSE; |
| 5633 | /* |
| 5634 | * Data Segment and SenseLength of the fabric response PDU. |
| 5635 | * |
| 5636 | * TRANSPORT_SENSE_BUFFER is now set to SCSI_SENSE_BUFFERSIZE |
| 5637 | * from include/scsi/scsi_cmnd.h |
| 5638 | */ |
| 5639 | offset = CMD_TFO(cmd)->set_fabric_sense_len(cmd, |
| 5640 | TRANSPORT_SENSE_BUFFER); |
| 5641 | /* |
| 5642 | * Actual SENSE DATA, see SPC-3 7.23.2 SPC_SENSE_KEY_OFFSET uses |
| 5643 | * SENSE KEY values from include/scsi/scsi.h |
| 5644 | */ |
| 5645 | switch (reason) { |
| 5646 | case TCM_NON_EXISTENT_LUN: |
| 5647 | case TCM_UNSUPPORTED_SCSI_OPCODE: |
| 5648 | case TCM_SECTOR_COUNT_TOO_MANY: |
| 5649 | /* CURRENT ERROR */ |
| 5650 | buffer[offset] = 0x70; |
| 5651 | /* ILLEGAL REQUEST */ |
| 5652 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
| 5653 | /* INVALID COMMAND OPERATION CODE */ |
| 5654 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x20; |
| 5655 | break; |
| 5656 | case TCM_UNKNOWN_MODE_PAGE: |
| 5657 | /* CURRENT ERROR */ |
| 5658 | buffer[offset] = 0x70; |
| 5659 | /* ILLEGAL REQUEST */ |
| 5660 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
| 5661 | /* INVALID FIELD IN CDB */ |
| 5662 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; |
| 5663 | break; |
| 5664 | case TCM_CHECK_CONDITION_ABORT_CMD: |
| 5665 | /* CURRENT ERROR */ |
| 5666 | buffer[offset] = 0x70; |
| 5667 | /* ABORTED COMMAND */ |
| 5668 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
| 5669 | /* BUS DEVICE RESET FUNCTION OCCURRED */ |
| 5670 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x29; |
| 5671 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x03; |
| 5672 | break; |
| 5673 | case TCM_INCORRECT_AMOUNT_OF_DATA: |
| 5674 | /* CURRENT ERROR */ |
| 5675 | buffer[offset] = 0x70; |
| 5676 | /* ABORTED COMMAND */ |
| 5677 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
| 5678 | /* WRITE ERROR */ |
| 5679 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; |
| 5680 | /* NOT ENOUGH UNSOLICITED DATA */ |
| 5681 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0d; |
| 5682 | break; |
| 5683 | case TCM_INVALID_CDB_FIELD: |
| 5684 | /* CURRENT ERROR */ |
| 5685 | buffer[offset] = 0x70; |
| 5686 | /* ABORTED COMMAND */ |
| 5687 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
| 5688 | /* INVALID FIELD IN CDB */ |
| 5689 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x24; |
| 5690 | break; |
| 5691 | case TCM_INVALID_PARAMETER_LIST: |
| 5692 | /* CURRENT ERROR */ |
| 5693 | buffer[offset] = 0x70; |
| 5694 | /* ABORTED COMMAND */ |
| 5695 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
| 5696 | /* INVALID FIELD IN PARAMETER LIST */ |
| 5697 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x26; |
| 5698 | break; |
| 5699 | case TCM_UNEXPECTED_UNSOLICITED_DATA: |
| 5700 | /* CURRENT ERROR */ |
| 5701 | buffer[offset] = 0x70; |
| 5702 | /* ABORTED COMMAND */ |
| 5703 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
| 5704 | /* WRITE ERROR */ |
| 5705 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x0c; |
| 5706 | /* UNEXPECTED_UNSOLICITED_DATA */ |
| 5707 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x0c; |
| 5708 | break; |
| 5709 | case TCM_SERVICE_CRC_ERROR: |
| 5710 | /* CURRENT ERROR */ |
| 5711 | buffer[offset] = 0x70; |
| 5712 | /* ABORTED COMMAND */ |
| 5713 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
| 5714 | /* PROTOCOL SERVICE CRC ERROR */ |
| 5715 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x47; |
| 5716 | /* N/A */ |
| 5717 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x05; |
| 5718 | break; |
| 5719 | case TCM_SNACK_REJECTED: |
| 5720 | /* CURRENT ERROR */ |
| 5721 | buffer[offset] = 0x70; |
| 5722 | /* ABORTED COMMAND */ |
| 5723 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ABORTED_COMMAND; |
| 5724 | /* READ ERROR */ |
| 5725 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x11; |
| 5726 | /* FAILED RETRANSMISSION REQUEST */ |
| 5727 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = 0x13; |
| 5728 | break; |
| 5729 | case TCM_WRITE_PROTECTED: |
| 5730 | /* CURRENT ERROR */ |
| 5731 | buffer[offset] = 0x70; |
| 5732 | /* DATA PROTECT */ |
| 5733 | buffer[offset+SPC_SENSE_KEY_OFFSET] = DATA_PROTECT; |
| 5734 | /* WRITE PROTECTED */ |
| 5735 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x27; |
| 5736 | break; |
| 5737 | case TCM_CHECK_CONDITION_UNIT_ATTENTION: |
| 5738 | /* CURRENT ERROR */ |
| 5739 | buffer[offset] = 0x70; |
| 5740 | /* UNIT ATTENTION */ |
| 5741 | buffer[offset+SPC_SENSE_KEY_OFFSET] = UNIT_ATTENTION; |
| 5742 | core_scsi3_ua_for_check_condition(cmd, &asc, &ascq); |
| 5743 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; |
| 5744 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; |
| 5745 | break; |
| 5746 | case TCM_CHECK_CONDITION_NOT_READY: |
| 5747 | /* CURRENT ERROR */ |
| 5748 | buffer[offset] = 0x70; |
| 5749 | /* Not Ready */ |
| 5750 | buffer[offset+SPC_SENSE_KEY_OFFSET] = NOT_READY; |
| 5751 | transport_get_sense_codes(cmd, &asc, &ascq); |
| 5752 | buffer[offset+SPC_ASC_KEY_OFFSET] = asc; |
| 5753 | buffer[offset+SPC_ASCQ_KEY_OFFSET] = ascq; |
| 5754 | break; |
| 5755 | case TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE: |
| 5756 | default: |
| 5757 | /* CURRENT ERROR */ |
| 5758 | buffer[offset] = 0x70; |
| 5759 | /* ILLEGAL REQUEST */ |
| 5760 | buffer[offset+SPC_SENSE_KEY_OFFSET] = ILLEGAL_REQUEST; |
| 5761 | /* LOGICAL UNIT COMMUNICATION FAILURE */ |
| 5762 | buffer[offset+SPC_ASC_KEY_OFFSET] = 0x80; |
| 5763 | break; |
| 5764 | } |
| 5765 | /* |
| 5766 | * This code uses linux/include/scsi/scsi.h SAM status codes! |
| 5767 | */ |
| 5768 | cmd->scsi_status = SAM_STAT_CHECK_CONDITION; |
| 5769 | /* |
| 5770 | * Automatically padded, this value is encoded in the fabric's |
| 5771 | * data_length response PDU containing the SCSI defined sense data. |
| 5772 | */ |
| 5773 | cmd->scsi_sense_length = TRANSPORT_SENSE_BUFFER + offset; |
| 5774 | |
| 5775 | after_reason: |
| 5776 | CMD_TFO(cmd)->queue_status(cmd); |
| 5777 | return 0; |
| 5778 | } |
| 5779 | EXPORT_SYMBOL(transport_send_check_condition_and_sense); |
| 5780 | |
| 5781 | int transport_check_aborted_status(struct se_cmd *cmd, int send_status) |
| 5782 | { |
| 5783 | int ret = 0; |
| 5784 | |
| 5785 | if (atomic_read(&T_TASK(cmd)->t_transport_aborted) != 0) { |
| 5786 | if (!(send_status) || |
| 5787 | (cmd->se_cmd_flags & SCF_SENT_DELAYED_TAS)) |
| 5788 | return 1; |
| 5789 | #if 0 |
| 5790 | printk(KERN_INFO "Sending delayed SAM_STAT_TASK_ABORTED" |
| 5791 | " status for CDB: 0x%02x ITT: 0x%08x\n", |
| 5792 | T_TASK(cmd)->t_task_cdb[0], |
| 5793 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5794 | #endif |
| 5795 | cmd->se_cmd_flags |= SCF_SENT_DELAYED_TAS; |
| 5796 | CMD_TFO(cmd)->queue_status(cmd); |
| 5797 | ret = 1; |
| 5798 | } |
| 5799 | return ret; |
| 5800 | } |
| 5801 | EXPORT_SYMBOL(transport_check_aborted_status); |
| 5802 | |
| 5803 | void transport_send_task_abort(struct se_cmd *cmd) |
| 5804 | { |
| 5805 | /* |
| 5806 | * If there are still expected incoming fabric WRITEs, we wait |
| 5807 | * until until they have completed before sending a TASK_ABORTED |
| 5808 | * response. This response with TASK_ABORTED status will be |
| 5809 | * queued back to fabric module by transport_check_aborted_status(). |
| 5810 | */ |
| 5811 | if (cmd->data_direction == DMA_TO_DEVICE) { |
| 5812 | if (CMD_TFO(cmd)->write_pending_status(cmd) != 0) { |
| 5813 | atomic_inc(&T_TASK(cmd)->t_transport_aborted); |
| 5814 | smp_mb__after_atomic_inc(); |
| 5815 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; |
| 5816 | transport_new_cmd_failure(cmd); |
| 5817 | return; |
| 5818 | } |
| 5819 | } |
| 5820 | cmd->scsi_status = SAM_STAT_TASK_ABORTED; |
| 5821 | #if 0 |
| 5822 | printk(KERN_INFO "Setting SAM_STAT_TASK_ABORTED status for CDB: 0x%02x," |
| 5823 | " ITT: 0x%08x\n", T_TASK(cmd)->t_task_cdb[0], |
| 5824 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5825 | #endif |
| 5826 | CMD_TFO(cmd)->queue_status(cmd); |
| 5827 | } |
| 5828 | |
| 5829 | /* transport_generic_do_tmr(): |
| 5830 | * |
| 5831 | * |
| 5832 | */ |
| 5833 | int transport_generic_do_tmr(struct se_cmd *cmd) |
| 5834 | { |
| 5835 | struct se_cmd *ref_cmd; |
| 5836 | struct se_device *dev = SE_DEV(cmd); |
| 5837 | struct se_tmr_req *tmr = cmd->se_tmr_req; |
| 5838 | int ret; |
| 5839 | |
| 5840 | switch (tmr->function) { |
Nicholas Bellinger | 5c6cd61 | 2011-03-14 04:06:04 -0700 | [diff] [blame] | 5841 | case TMR_ABORT_TASK: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 5842 | ref_cmd = tmr->ref_cmd; |
| 5843 | tmr->response = TMR_FUNCTION_REJECTED; |
| 5844 | break; |
Nicholas Bellinger | 5c6cd61 | 2011-03-14 04:06:04 -0700 | [diff] [blame] | 5845 | case TMR_ABORT_TASK_SET: |
| 5846 | case TMR_CLEAR_ACA: |
| 5847 | case TMR_CLEAR_TASK_SET: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 5848 | tmr->response = TMR_TASK_MGMT_FUNCTION_NOT_SUPPORTED; |
| 5849 | break; |
Nicholas Bellinger | 5c6cd61 | 2011-03-14 04:06:04 -0700 | [diff] [blame] | 5850 | case TMR_LUN_RESET: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 5851 | ret = core_tmr_lun_reset(dev, tmr, NULL, NULL); |
| 5852 | tmr->response = (!ret) ? TMR_FUNCTION_COMPLETE : |
| 5853 | TMR_FUNCTION_REJECTED; |
| 5854 | break; |
Nicholas Bellinger | 5c6cd61 | 2011-03-14 04:06:04 -0700 | [diff] [blame] | 5855 | case TMR_TARGET_WARM_RESET: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 5856 | tmr->response = TMR_FUNCTION_REJECTED; |
| 5857 | break; |
Nicholas Bellinger | 5c6cd61 | 2011-03-14 04:06:04 -0700 | [diff] [blame] | 5858 | case TMR_TARGET_COLD_RESET: |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 5859 | tmr->response = TMR_FUNCTION_REJECTED; |
| 5860 | break; |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 5861 | default: |
| 5862 | printk(KERN_ERR "Uknown TMR function: 0x%02x.\n", |
| 5863 | tmr->function); |
| 5864 | tmr->response = TMR_FUNCTION_REJECTED; |
| 5865 | break; |
| 5866 | } |
| 5867 | |
| 5868 | cmd->t_state = TRANSPORT_ISTATE_PROCESSING; |
| 5869 | CMD_TFO(cmd)->queue_tm_rsp(cmd); |
| 5870 | |
| 5871 | transport_cmd_check_stop(cmd, 2, 0); |
| 5872 | return 0; |
| 5873 | } |
| 5874 | |
| 5875 | /* |
| 5876 | * Called with spin_lock_irq(&dev->execute_task_lock); held |
| 5877 | * |
| 5878 | */ |
| 5879 | static struct se_task * |
| 5880 | transport_get_task_from_state_list(struct se_device *dev) |
| 5881 | { |
| 5882 | struct se_task *task; |
| 5883 | |
| 5884 | if (list_empty(&dev->state_task_list)) |
| 5885 | return NULL; |
| 5886 | |
| 5887 | list_for_each_entry(task, &dev->state_task_list, t_state_list) |
| 5888 | break; |
| 5889 | |
| 5890 | list_del(&task->t_state_list); |
| 5891 | atomic_set(&task->task_state_active, 0); |
| 5892 | |
| 5893 | return task; |
| 5894 | } |
| 5895 | |
| 5896 | static void transport_processing_shutdown(struct se_device *dev) |
| 5897 | { |
| 5898 | struct se_cmd *cmd; |
| 5899 | struct se_queue_req *qr; |
| 5900 | struct se_task *task; |
| 5901 | u8 state; |
| 5902 | unsigned long flags; |
| 5903 | /* |
| 5904 | * Empty the struct se_device's struct se_task state list. |
| 5905 | */ |
| 5906 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
| 5907 | while ((task = transport_get_task_from_state_list(dev))) { |
| 5908 | if (!(TASK_CMD(task))) { |
| 5909 | printk(KERN_ERR "TASK_CMD(task) is NULL!\n"); |
| 5910 | continue; |
| 5911 | } |
| 5912 | cmd = TASK_CMD(task); |
| 5913 | |
| 5914 | if (!T_TASK(cmd)) { |
| 5915 | printk(KERN_ERR "T_TASK(cmd) is NULL for task: %p cmd:" |
| 5916 | " %p ITT: 0x%08x\n", task, cmd, |
| 5917 | CMD_TFO(cmd)->get_task_tag(cmd)); |
| 5918 | continue; |
| 5919 | } |
| 5920 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
| 5921 | |
| 5922 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 5923 | |
| 5924 | DEBUG_DO("PT: cmd: %p task: %p ITT/CmdSN: 0x%08x/0x%08x," |
| 5925 | " i_state/def_i_state: %d/%d, t_state/def_t_state:" |
| 5926 | " %d/%d cdb: 0x%02x\n", cmd, task, |
| 5927 | CMD_TFO(cmd)->get_task_tag(cmd), cmd->cmd_sn, |
| 5928 | CMD_TFO(cmd)->get_cmd_state(cmd), cmd->deferred_i_state, |
| 5929 | cmd->t_state, cmd->deferred_t_state, |
| 5930 | T_TASK(cmd)->t_task_cdb[0]); |
| 5931 | DEBUG_DO("PT: ITT[0x%08x] - t_task_cdbs: %d t_task_cdbs_left:" |
| 5932 | " %d t_task_cdbs_sent: %d -- t_transport_active: %d" |
| 5933 | " t_transport_stop: %d t_transport_sent: %d\n", |
| 5934 | CMD_TFO(cmd)->get_task_tag(cmd), |
| 5935 | T_TASK(cmd)->t_task_cdbs, |
| 5936 | atomic_read(&T_TASK(cmd)->t_task_cdbs_left), |
| 5937 | atomic_read(&T_TASK(cmd)->t_task_cdbs_sent), |
| 5938 | atomic_read(&T_TASK(cmd)->t_transport_active), |
| 5939 | atomic_read(&T_TASK(cmd)->t_transport_stop), |
| 5940 | atomic_read(&T_TASK(cmd)->t_transport_sent)); |
| 5941 | |
| 5942 | if (atomic_read(&task->task_active)) { |
| 5943 | atomic_set(&task->task_stop, 1); |
| 5944 | spin_unlock_irqrestore( |
| 5945 | &T_TASK(cmd)->t_state_lock, flags); |
| 5946 | |
| 5947 | DEBUG_DO("Waiting for task: %p to shutdown for dev:" |
| 5948 | " %p\n", task, dev); |
| 5949 | wait_for_completion(&task->task_stop_comp); |
| 5950 | DEBUG_DO("Completed task: %p shutdown for dev: %p\n", |
| 5951 | task, dev); |
| 5952 | |
| 5953 | spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); |
| 5954 | atomic_dec(&T_TASK(cmd)->t_task_cdbs_left); |
| 5955 | |
| 5956 | atomic_set(&task->task_active, 0); |
| 5957 | atomic_set(&task->task_stop, 0); |
Nicholas Bellinger | 52208ae | 2011-02-24 16:58:20 -0800 | [diff] [blame] | 5958 | } else { |
| 5959 | if (atomic_read(&task->task_execute_queue) != 0) |
| 5960 | transport_remove_task_from_execute_queue(task, dev); |
Nicholas Bellinger | c66ac9d | 2010-12-17 11:11:26 -0800 | [diff] [blame] | 5961 | } |
| 5962 | __transport_stop_task_timer(task, &flags); |
| 5963 | |
| 5964 | if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_ex_left))) { |
| 5965 | spin_unlock_irqrestore( |
| 5966 | &T_TASK(cmd)->t_state_lock, flags); |
| 5967 | |
| 5968 | DEBUG_DO("Skipping task: %p, dev: %p for" |
| 5969 | " t_task_cdbs_ex_left: %d\n", task, dev, |
| 5970 | atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left)); |
| 5971 | |
| 5972 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
| 5973 | continue; |
| 5974 | } |
| 5975 | |
| 5976 | if (atomic_read(&T_TASK(cmd)->t_transport_active)) { |
| 5977 | DEBUG_DO("got t_transport_active = 1 for task: %p, dev:" |
| 5978 | " %p\n", task, dev); |
| 5979 | |
| 5980 | if (atomic_read(&T_TASK(cmd)->t_fe_count)) { |
| 5981 | spin_unlock_irqrestore( |
| 5982 | &T_TASK(cmd)->t_state_lock, flags); |
| 5983 | transport_send_check_condition_and_sense( |
| 5984 | cmd, TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, |
| 5985 | 0); |
| 5986 | transport_remove_cmd_from_queue(cmd, |
| 5987 | SE_DEV(cmd)->dev_queue_obj); |
| 5988 | |
| 5989 | transport_lun_remove_cmd(cmd); |
| 5990 | transport_cmd_check_stop(cmd, 1, 0); |
| 5991 | } else { |
| 5992 | spin_unlock_irqrestore( |
| 5993 | &T_TASK(cmd)->t_state_lock, flags); |
| 5994 | |
| 5995 | transport_remove_cmd_from_queue(cmd, |
| 5996 | SE_DEV(cmd)->dev_queue_obj); |
| 5997 | |
| 5998 | transport_lun_remove_cmd(cmd); |
| 5999 | |
| 6000 | if (transport_cmd_check_stop(cmd, 1, 0)) |
| 6001 | transport_generic_remove(cmd, 0, 0); |
| 6002 | } |
| 6003 | |
| 6004 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
| 6005 | continue; |
| 6006 | } |
| 6007 | DEBUG_DO("Got t_transport_active = 0 for task: %p, dev: %p\n", |
| 6008 | task, dev); |
| 6009 | |
| 6010 | if (atomic_read(&T_TASK(cmd)->t_fe_count)) { |
| 6011 | spin_unlock_irqrestore( |
| 6012 | &T_TASK(cmd)->t_state_lock, flags); |
| 6013 | transport_send_check_condition_and_sense(cmd, |
| 6014 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
| 6015 | transport_remove_cmd_from_queue(cmd, |
| 6016 | SE_DEV(cmd)->dev_queue_obj); |
| 6017 | |
| 6018 | transport_lun_remove_cmd(cmd); |
| 6019 | transport_cmd_check_stop(cmd, 1, 0); |
| 6020 | } else { |
| 6021 | spin_unlock_irqrestore( |
| 6022 | &T_TASK(cmd)->t_state_lock, flags); |
| 6023 | |
| 6024 | transport_remove_cmd_from_queue(cmd, |
| 6025 | SE_DEV(cmd)->dev_queue_obj); |
| 6026 | transport_lun_remove_cmd(cmd); |
| 6027 | |
| 6028 | if (transport_cmd_check_stop(cmd, 1, 0)) |
| 6029 | transport_generic_remove(cmd, 0, 0); |
| 6030 | } |
| 6031 | |
| 6032 | spin_lock_irqsave(&dev->execute_task_lock, flags); |
| 6033 | } |
| 6034 | spin_unlock_irqrestore(&dev->execute_task_lock, flags); |
| 6035 | /* |
| 6036 | * Empty the struct se_device's struct se_cmd list. |
| 6037 | */ |
| 6038 | spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags); |
| 6039 | while ((qr = __transport_get_qr_from_queue(dev->dev_queue_obj))) { |
| 6040 | spin_unlock_irqrestore( |
| 6041 | &dev->dev_queue_obj->cmd_queue_lock, flags); |
| 6042 | cmd = (struct se_cmd *)qr->cmd; |
| 6043 | state = qr->state; |
| 6044 | kfree(qr); |
| 6045 | |
| 6046 | DEBUG_DO("From Device Queue: cmd: %p t_state: %d\n", |
| 6047 | cmd, state); |
| 6048 | |
| 6049 | if (atomic_read(&T_TASK(cmd)->t_fe_count)) { |
| 6050 | transport_send_check_condition_and_sense(cmd, |
| 6051 | TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE, 0); |
| 6052 | |
| 6053 | transport_lun_remove_cmd(cmd); |
| 6054 | transport_cmd_check_stop(cmd, 1, 0); |
| 6055 | } else { |
| 6056 | transport_lun_remove_cmd(cmd); |
| 6057 | if (transport_cmd_check_stop(cmd, 1, 0)) |
| 6058 | transport_generic_remove(cmd, 0, 0); |
| 6059 | } |
| 6060 | spin_lock_irqsave(&dev->dev_queue_obj->cmd_queue_lock, flags); |
| 6061 | } |
| 6062 | spin_unlock_irqrestore(&dev->dev_queue_obj->cmd_queue_lock, flags); |
| 6063 | } |
| 6064 | |
| 6065 | /* transport_processing_thread(): |
| 6066 | * |
| 6067 | * |
| 6068 | */ |
| 6069 | static int transport_processing_thread(void *param) |
| 6070 | { |
| 6071 | int ret, t_state; |
| 6072 | struct se_cmd *cmd; |
| 6073 | struct se_device *dev = (struct se_device *) param; |
| 6074 | struct se_queue_req *qr; |
| 6075 | |
| 6076 | set_user_nice(current, -20); |
| 6077 | |
| 6078 | while (!kthread_should_stop()) { |
| 6079 | ret = wait_event_interruptible(dev->dev_queue_obj->thread_wq, |
| 6080 | atomic_read(&dev->dev_queue_obj->queue_cnt) || |
| 6081 | kthread_should_stop()); |
| 6082 | if (ret < 0) |
| 6083 | goto out; |
| 6084 | |
| 6085 | spin_lock_irq(&dev->dev_status_lock); |
| 6086 | if (dev->dev_status & TRANSPORT_DEVICE_SHUTDOWN) { |
| 6087 | spin_unlock_irq(&dev->dev_status_lock); |
| 6088 | transport_processing_shutdown(dev); |
| 6089 | continue; |
| 6090 | } |
| 6091 | spin_unlock_irq(&dev->dev_status_lock); |
| 6092 | |
| 6093 | get_cmd: |
| 6094 | __transport_execute_tasks(dev); |
| 6095 | |
| 6096 | qr = transport_get_qr_from_queue(dev->dev_queue_obj); |
| 6097 | if (!(qr)) |
| 6098 | continue; |
| 6099 | |
| 6100 | cmd = (struct se_cmd *)qr->cmd; |
| 6101 | t_state = qr->state; |
| 6102 | kfree(qr); |
| 6103 | |
| 6104 | switch (t_state) { |
| 6105 | case TRANSPORT_NEW_CMD_MAP: |
| 6106 | if (!(CMD_TFO(cmd)->new_cmd_map)) { |
| 6107 | printk(KERN_ERR "CMD_TFO(cmd)->new_cmd_map is" |
| 6108 | " NULL for TRANSPORT_NEW_CMD_MAP\n"); |
| 6109 | BUG(); |
| 6110 | } |
| 6111 | ret = CMD_TFO(cmd)->new_cmd_map(cmd); |
| 6112 | if (ret < 0) { |
| 6113 | cmd->transport_error_status = ret; |
| 6114 | transport_generic_request_failure(cmd, NULL, |
| 6115 | 0, (cmd->data_direction != |
| 6116 | DMA_TO_DEVICE)); |
| 6117 | break; |
| 6118 | } |
| 6119 | /* Fall through */ |
| 6120 | case TRANSPORT_NEW_CMD: |
| 6121 | ret = transport_generic_new_cmd(cmd); |
| 6122 | if (ret < 0) { |
| 6123 | cmd->transport_error_status = ret; |
| 6124 | transport_generic_request_failure(cmd, NULL, |
| 6125 | 0, (cmd->data_direction != |
| 6126 | DMA_TO_DEVICE)); |
| 6127 | } |
| 6128 | break; |
| 6129 | case TRANSPORT_PROCESS_WRITE: |
| 6130 | transport_generic_process_write(cmd); |
| 6131 | break; |
| 6132 | case TRANSPORT_COMPLETE_OK: |
| 6133 | transport_stop_all_task_timers(cmd); |
| 6134 | transport_generic_complete_ok(cmd); |
| 6135 | break; |
| 6136 | case TRANSPORT_REMOVE: |
| 6137 | transport_generic_remove(cmd, 1, 0); |
| 6138 | break; |
| 6139 | case TRANSPORT_PROCESS_TMR: |
| 6140 | transport_generic_do_tmr(cmd); |
| 6141 | break; |
| 6142 | case TRANSPORT_COMPLETE_FAILURE: |
| 6143 | transport_generic_request_failure(cmd, NULL, 1, 1); |
| 6144 | break; |
| 6145 | case TRANSPORT_COMPLETE_TIMEOUT: |
| 6146 | transport_stop_all_task_timers(cmd); |
| 6147 | transport_generic_request_timeout(cmd); |
| 6148 | break; |
| 6149 | default: |
| 6150 | printk(KERN_ERR "Unknown t_state: %d deferred_t_state:" |
| 6151 | " %d for ITT: 0x%08x i_state: %d on SE LUN:" |
| 6152 | " %u\n", t_state, cmd->deferred_t_state, |
| 6153 | CMD_TFO(cmd)->get_task_tag(cmd), |
| 6154 | CMD_TFO(cmd)->get_cmd_state(cmd), |
| 6155 | SE_LUN(cmd)->unpacked_lun); |
| 6156 | BUG(); |
| 6157 | } |
| 6158 | |
| 6159 | goto get_cmd; |
| 6160 | } |
| 6161 | |
| 6162 | out: |
| 6163 | transport_release_all_cmds(dev); |
| 6164 | dev->process_thread = NULL; |
| 6165 | return 0; |
| 6166 | } |