1 /******************************************************************************* 2 * Filename: target_core_tmr.c 3 * 4 * This file contains SPC-3 task management infrastructure 5 * 6 * Copyright (c) 2009,2010 Rising Tide Systems 7 * Copyright (c) 2009,2010 Linux-iSCSI.org 8 * 9 * Nicholas A. Bellinger <nab@kernel.org> 10 * 11 * This program is free software; you can redistribute it and/or modify 12 * it under the terms of the GNU General Public License as published by 13 * the Free Software Foundation; either version 2 of the License, or 14 * (at your option) any later version. 15 * 16 * This program is distributed in the hope that it will be useful, 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19 * GNU General Public License for more details. 20 * 21 * You should have received a copy of the GNU General Public License 22 * along with this program; if not, write to the Free Software 23 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 24 * 25 ******************************************************************************/ 26 27 #include <linux/version.h> 28 #include <linux/slab.h> 29 #include <linux/spinlock.h> 30 #include <linux/list.h> 31 #include <scsi/scsi.h> 32 #include <scsi/scsi_cmnd.h> 33 34 #include <target/target_core_base.h> 35 #include <target/target_core_device.h> 36 #include <target/target_core_tmr.h> 37 #include <target/target_core_transport.h> 38 #include <target/target_core_fabric_ops.h> 39 #include <target/target_core_configfs.h> 40 41 #include "target_core_alua.h" 42 #include "target_core_pr.h" 43 44 #define DEBUG_LUN_RESET 45 #ifdef DEBUG_LUN_RESET 46 #define DEBUG_LR(x...) printk(KERN_INFO x) 47 #else 48 #define DEBUG_LR(x...) 49 #endif 50 51 struct se_tmr_req *core_tmr_alloc_req( 52 struct se_cmd *se_cmd, 53 void *fabric_tmr_ptr, 54 u8 function) 55 { 56 struct se_tmr_req *tmr; 57 58 tmr = kmem_cache_zalloc(se_tmr_req_cache, GFP_KERNEL); 59 if (!(tmr)) { 60 printk(KERN_ERR "Unable to allocate struct se_tmr_req\n"); 61 return ERR_PTR(-ENOMEM); 62 } 63 tmr->task_cmd = se_cmd; 64 tmr->fabric_tmr_ptr = fabric_tmr_ptr; 65 tmr->function = function; 66 INIT_LIST_HEAD(&tmr->tmr_list); 67 68 return tmr; 69 } 70 EXPORT_SYMBOL(core_tmr_alloc_req); 71 72 void core_tmr_release_req( 73 struct se_tmr_req *tmr) 74 { 75 struct se_device *dev = tmr->tmr_dev; 76 77 spin_lock(&dev->se_tmr_lock); 78 list_del(&tmr->tmr_list); 79 kmem_cache_free(se_tmr_req_cache, tmr); 80 spin_unlock(&dev->se_tmr_lock); 81 } 82 83 static void core_tmr_handle_tas_abort( 84 struct se_node_acl *tmr_nacl, 85 struct se_cmd *cmd, 86 int tas, 87 int fe_count) 88 { 89 if (!(fe_count)) { 90 transport_cmd_finish_abort(cmd, 1); 91 return; 92 } 93 /* 94 * TASK ABORTED status (TAS) bit support 95 */ 96 if (((tmr_nacl != NULL) && 97 (tmr_nacl == cmd->se_sess->se_node_acl)) || tas) 98 transport_send_task_abort(cmd); 99 100 transport_cmd_finish_abort(cmd, 0); 101 } 102 103 int core_tmr_lun_reset( 104 struct se_device *dev, 105 struct se_tmr_req *tmr, 106 struct list_head *preempt_and_abort_list, 107 struct se_cmd *prout_cmd) 108 { 109 struct se_cmd *cmd; 110 struct se_queue_req *qr, *qr_tmp; 111 struct se_node_acl *tmr_nacl = NULL; 112 struct se_portal_group *tmr_tpg = NULL; 113 struct se_queue_obj *qobj = dev->dev_queue_obj; 114 struct se_tmr_req *tmr_p, *tmr_pp; 115 struct se_task *task, *task_tmp; 116 unsigned long flags; 117 int fe_count, state, tas; 118 /* 119 * TASK_ABORTED status bit, this is configurable via ConfigFS 120 * struct se_device attributes. spc4r17 section 7.4.6 Control mode page 121 * 122 * A task aborted status (TAS) bit set to zero specifies that aborted 123 * tasks shall be terminated by the device server without any response 124 * to the application client. A TAS bit set to one specifies that tasks 125 * aborted by the actions of an I_T nexus other than the I_T nexus on 126 * which the command was received shall be completed with TASK ABORTED 127 * status (see SAM-4). 128 */ 129 tas = DEV_ATTRIB(dev)->emulate_tas; 130 /* 131 * Determine if this se_tmr is coming from a $FABRIC_MOD 132 * or struct se_device passthrough.. 133 */ 134 if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { 135 tmr_nacl = tmr->task_cmd->se_sess->se_node_acl; 136 tmr_tpg = tmr->task_cmd->se_sess->se_tpg; 137 if (tmr_nacl && tmr_tpg) { 138 DEBUG_LR("LUN_RESET: TMR caller fabric: %s" 139 " initiator port %s\n", 140 TPG_TFO(tmr_tpg)->get_fabric_name(), 141 tmr_nacl->initiatorname); 142 } 143 } 144 DEBUG_LR("LUN_RESET: %s starting for [%s], tas: %d\n", 145 (preempt_and_abort_list) ? "Preempt" : "TMR", 146 TRANSPORT(dev)->name, tas); 147 /* 148 * Release all pending and outgoing TMRs aside from the received 149 * LUN_RESET tmr.. 150 */ 151 spin_lock(&dev->se_tmr_lock); 152 list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { 153 /* 154 * Allow the received TMR to return with FUNCTION_COMPLETE. 155 */ 156 if (tmr && (tmr_p == tmr)) 157 continue; 158 159 cmd = tmr_p->task_cmd; 160 if (!(cmd)) { 161 printk(KERN_ERR "Unable to locate struct se_cmd for TMR\n"); 162 continue; 163 } 164 /* 165 * If this function was called with a valid pr_res_key 166 * parameter (eg: for PROUT PREEMPT_AND_ABORT service action 167 * skip non regisration key matching TMRs. 168 */ 169 if ((preempt_and_abort_list != NULL) && 170 (core_scsi3_check_cdb_abort_and_preempt( 171 preempt_and_abort_list, cmd) != 0)) 172 continue; 173 spin_unlock(&dev->se_tmr_lock); 174 175 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); 176 if (!(atomic_read(&T_TASK(cmd)->t_transport_active))) { 177 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); 178 spin_lock(&dev->se_tmr_lock); 179 continue; 180 } 181 if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { 182 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); 183 spin_lock(&dev->se_tmr_lock); 184 continue; 185 } 186 DEBUG_LR("LUN_RESET: %s releasing TMR %p Function: 0x%02x," 187 " Response: 0x%02x, t_state: %d\n", 188 (preempt_and_abort_list) ? "Preempt" : "", tmr_p, 189 tmr_p->function, tmr_p->response, cmd->t_state); 190 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); 191 192 transport_cmd_finish_abort_tmr(cmd); 193 spin_lock(&dev->se_tmr_lock); 194 } 195 spin_unlock(&dev->se_tmr_lock); 196 /* 197 * Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status. 198 * This is following sam4r17, section 5.6 Aborting commands, Table 38 199 * for TMR LUN_RESET: 200 * 201 * a) "Yes" indicates that each command that is aborted on an I_T nexus 202 * other than the one that caused the SCSI device condition is 203 * completed with TASK ABORTED status, if the TAS bit is set to one in 204 * the Control mode page (see SPC-4). "No" indicates that no status is 205 * returned for aborted commands. 206 * 207 * d) If the logical unit reset is caused by a particular I_T nexus 208 * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" 209 * (TASK_ABORTED status) applies. 210 * 211 * Otherwise (e.g., if triggered by a hard reset), "no" 212 * (no TASK_ABORTED SAM status) applies. 213 * 214 * Note that this seems to be independent of TAS (Task Aborted Status) 215 * in the Control Mode Page. 216 */ 217 spin_lock_irqsave(&dev->execute_task_lock, flags); 218 list_for_each_entry_safe(task, task_tmp, &dev->state_task_list, 219 t_state_list) { 220 if (!(TASK_CMD(task))) { 221 printk(KERN_ERR "TASK_CMD(task) is NULL!\n"); 222 continue; 223 } 224 cmd = TASK_CMD(task); 225 226 if (!T_TASK(cmd)) { 227 printk(KERN_ERR "T_TASK(cmd) is NULL for task: %p cmd:" 228 " %p ITT: 0x%08x\n", task, cmd, 229 CMD_TFO(cmd)->get_task_tag(cmd)); 230 continue; 231 } 232 /* 233 * For PREEMPT_AND_ABORT usage, only process commands 234 * with a matching reservation key. 235 */ 236 if ((preempt_and_abort_list != NULL) && 237 (core_scsi3_check_cdb_abort_and_preempt( 238 preempt_and_abort_list, cmd) != 0)) 239 continue; 240 /* 241 * Not aborting PROUT PREEMPT_AND_ABORT CDB.. 242 */ 243 if (prout_cmd == cmd) 244 continue; 245 246 list_del(&task->t_state_list); 247 atomic_set(&task->task_state_active, 0); 248 spin_unlock_irqrestore(&dev->execute_task_lock, flags); 249 250 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); 251 DEBUG_LR("LUN_RESET: %s cmd: %p task: %p" 252 " ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state/" 253 "def_t_state: %d/%d cdb: 0x%02x\n", 254 (preempt_and_abort_list) ? "Preempt" : "", cmd, task, 255 CMD_TFO(cmd)->get_task_tag(cmd), 0, 256 CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state, 257 cmd->deferred_t_state, T_TASK(cmd)->t_task_cdb[0]); 258 DEBUG_LR("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx" 259 " t_task_cdbs: %d t_task_cdbs_left: %d" 260 " t_task_cdbs_sent: %d -- t_transport_active: %d" 261 " t_transport_stop: %d t_transport_sent: %d\n", 262 CMD_TFO(cmd)->get_task_tag(cmd), cmd->pr_res_key, 263 T_TASK(cmd)->t_task_cdbs, 264 atomic_read(&T_TASK(cmd)->t_task_cdbs_left), 265 atomic_read(&T_TASK(cmd)->t_task_cdbs_sent), 266 atomic_read(&T_TASK(cmd)->t_transport_active), 267 atomic_read(&T_TASK(cmd)->t_transport_stop), 268 atomic_read(&T_TASK(cmd)->t_transport_sent)); 269 270 if (atomic_read(&task->task_active)) { 271 atomic_set(&task->task_stop, 1); 272 spin_unlock_irqrestore( 273 &T_TASK(cmd)->t_state_lock, flags); 274 275 DEBUG_LR("LUN_RESET: Waiting for task: %p to shutdown" 276 " for dev: %p\n", task, dev); 277 wait_for_completion(&task->task_stop_comp); 278 DEBUG_LR("LUN_RESET Completed task: %p shutdown for" 279 " dev: %p\n", task, dev); 280 spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags); 281 atomic_dec(&T_TASK(cmd)->t_task_cdbs_left); 282 283 atomic_set(&task->task_active, 0); 284 atomic_set(&task->task_stop, 0); 285 } 286 __transport_stop_task_timer(task, &flags); 287 288 if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_ex_left))) { 289 spin_unlock_irqrestore( 290 &T_TASK(cmd)->t_state_lock, flags); 291 DEBUG_LR("LUN_RESET: Skipping task: %p, dev: %p for" 292 " t_task_cdbs_ex_left: %d\n", task, dev, 293 atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left)); 294 295 spin_lock_irqsave(&dev->execute_task_lock, flags); 296 continue; 297 } 298 fe_count = atomic_read(&T_TASK(cmd)->t_fe_count); 299 300 if (atomic_read(&T_TASK(cmd)->t_transport_active)) { 301 DEBUG_LR("LUN_RESET: got t_transport_active = 1 for" 302 " task: %p, t_fe_count: %d dev: %p\n", task, 303 fe_count, dev); 304 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, 305 flags); 306 core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); 307 308 spin_lock_irqsave(&dev->execute_task_lock, flags); 309 continue; 310 } 311 DEBUG_LR("LUN_RESET: Got t_transport_active = 0 for task: %p," 312 " t_fe_count: %d dev: %p\n", task, fe_count, dev); 313 spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags); 314 core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); 315 316 spin_lock_irqsave(&dev->execute_task_lock, flags); 317 } 318 spin_unlock_irqrestore(&dev->execute_task_lock, flags); 319 /* 320 * Release all commands remaining in the struct se_device cmd queue. 321 * 322 * This follows the same logic as above for the struct se_device 323 * struct se_task state list, where commands are returned with 324 * TASK_ABORTED status, if there is an outstanding $FABRIC_MOD 325 * reference, otherwise the struct se_cmd is released. 326 */ 327 spin_lock_irqsave(&qobj->cmd_queue_lock, flags); 328 list_for_each_entry_safe(qr, qr_tmp, &qobj->qobj_list, qr_list) { 329 cmd = (struct se_cmd *)qr->cmd; 330 if (!(cmd)) { 331 /* 332 * Skip these for non PREEMPT_AND_ABORT usage.. 333 */ 334 if (preempt_and_abort_list != NULL) 335 continue; 336 337 atomic_dec(&qobj->queue_cnt); 338 list_del(&qr->qr_list); 339 kfree(qr); 340 continue; 341 } 342 /* 343 * For PREEMPT_AND_ABORT usage, only process commands 344 * with a matching reservation key. 345 */ 346 if ((preempt_and_abort_list != NULL) && 347 (core_scsi3_check_cdb_abort_and_preempt( 348 preempt_and_abort_list, cmd) != 0)) 349 continue; 350 /* 351 * Not aborting PROUT PREEMPT_AND_ABORT CDB.. 352 */ 353 if (prout_cmd == cmd) 354 continue; 355 356 atomic_dec(&T_TASK(cmd)->t_transport_queue_active); 357 atomic_dec(&qobj->queue_cnt); 358 list_del(&qr->qr_list); 359 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); 360 361 state = qr->state; 362 kfree(qr); 363 364 DEBUG_LR("LUN_RESET: %s from Device Queue: cmd: %p t_state:" 365 " %d t_fe_count: %d\n", (preempt_and_abort_list) ? 366 "Preempt" : "", cmd, state, 367 atomic_read(&T_TASK(cmd)->t_fe_count)); 368 /* 369 * Signal that the command has failed via cmd->se_cmd_flags, 370 * and call TFO->new_cmd_failure() to wakeup any fabric 371 * dependent code used to wait for unsolicited data out 372 * allocation to complete. The fabric module is expected 373 * to dump any remaining unsolicited data out for the aborted 374 * command at this point. 375 */ 376 transport_new_cmd_failure(cmd); 377 378 core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, 379 atomic_read(&T_TASK(cmd)->t_fe_count)); 380 spin_lock_irqsave(&qobj->cmd_queue_lock, flags); 381 } 382 spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); 383 /* 384 * Clear any legacy SPC-2 reservation when called during 385 * LOGICAL UNIT RESET 386 */ 387 if (!(preempt_and_abort_list) && 388 (dev->dev_flags & DF_SPC2_RESERVATIONS)) { 389 spin_lock(&dev->dev_reservation_lock); 390 dev->dev_reserved_node_acl = NULL; 391 dev->dev_flags &= ~DF_SPC2_RESERVATIONS; 392 spin_unlock(&dev->dev_reservation_lock); 393 printk(KERN_INFO "LUN_RESET: SCSI-2 Released reservation\n"); 394 } 395 396 spin_lock(&dev->stats_lock); 397 dev->num_resets++; 398 spin_unlock(&dev->stats_lock); 399 400 DEBUG_LR("LUN_RESET: %s for [%s] Complete\n", 401 (preempt_and_abort_list) ? "Preempt" : "TMR", 402 TRANSPORT(dev)->name); 403 return 0; 404 } 405