1c66ac9dbSNicholas Bellinger /******************************************************************************* 2c66ac9dbSNicholas Bellinger * Filename: target_core_tmr.c 3c66ac9dbSNicholas Bellinger * 4c66ac9dbSNicholas Bellinger * This file contains SPC-3 task management infrastructure 5c66ac9dbSNicholas Bellinger * 6c66ac9dbSNicholas Bellinger * Copyright (c) 2009,2010 Rising Tide Systems 7c66ac9dbSNicholas Bellinger * Copyright (c) 2009,2010 Linux-iSCSI.org 8c66ac9dbSNicholas Bellinger * 9c66ac9dbSNicholas Bellinger * Nicholas A. Bellinger <nab@kernel.org> 10c66ac9dbSNicholas Bellinger * 11c66ac9dbSNicholas Bellinger * This program is free software; you can redistribute it and/or modify 12c66ac9dbSNicholas Bellinger * it under the terms of the GNU General Public License as published by 13c66ac9dbSNicholas Bellinger * the Free Software Foundation; either version 2 of the License, or 14c66ac9dbSNicholas Bellinger * (at your option) any later version. 15c66ac9dbSNicholas Bellinger * 16c66ac9dbSNicholas Bellinger * This program is distributed in the hope that it will be useful, 17c66ac9dbSNicholas Bellinger * but WITHOUT ANY WARRANTY; without even the implied warranty of 18c66ac9dbSNicholas Bellinger * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 19c66ac9dbSNicholas Bellinger * GNU General Public License for more details. 20c66ac9dbSNicholas Bellinger * 21c66ac9dbSNicholas Bellinger * You should have received a copy of the GNU General Public License 22c66ac9dbSNicholas Bellinger * along with this program; if not, write to the Free Software 23c66ac9dbSNicholas Bellinger * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 24c66ac9dbSNicholas Bellinger * 25c66ac9dbSNicholas Bellinger ******************************************************************************/ 26c66ac9dbSNicholas Bellinger 27c66ac9dbSNicholas Bellinger #include <linux/slab.h> 28c66ac9dbSNicholas Bellinger #include <linux/spinlock.h> 29c66ac9dbSNicholas Bellinger #include <linux/list.h> 30c53181afSPaul Gortmaker #include <linux/export.h> 31c66ac9dbSNicholas Bellinger #include <scsi/scsi.h> 32c66ac9dbSNicholas Bellinger #include <scsi/scsi_cmnd.h> 33c66ac9dbSNicholas Bellinger 34c66ac9dbSNicholas Bellinger #include <target/target_core_base.h> 35c4795fb2SChristoph Hellwig #include <target/target_core_backend.h> 36c4795fb2SChristoph Hellwig #include <target/target_core_fabric.h> 37c66ac9dbSNicholas Bellinger #include <target/target_core_configfs.h> 38c66ac9dbSNicholas Bellinger 39e26d99aeSChristoph Hellwig #include "target_core_internal.h" 40c66ac9dbSNicholas Bellinger #include "target_core_alua.h" 41c66ac9dbSNicholas Bellinger #include "target_core_pr.h" 42c66ac9dbSNicholas Bellinger 43c66ac9dbSNicholas Bellinger struct se_tmr_req *core_tmr_alloc_req( 44c66ac9dbSNicholas Bellinger struct se_cmd *se_cmd, 45c66ac9dbSNicholas Bellinger void *fabric_tmr_ptr, 46dd503a5fSRoland Dreier u8 function, 47dd503a5fSRoland Dreier gfp_t gfp_flags) 48c66ac9dbSNicholas Bellinger { 49c66ac9dbSNicholas Bellinger struct se_tmr_req *tmr; 50c66ac9dbSNicholas Bellinger 51dd503a5fSRoland Dreier tmr = kmem_cache_zalloc(se_tmr_req_cache, gfp_flags); 526708bb27SAndy Grover if (!tmr) { 536708bb27SAndy Grover pr_err("Unable to allocate struct se_tmr_req\n"); 54c66ac9dbSNicholas Bellinger return ERR_PTR(-ENOMEM); 55c66ac9dbSNicholas Bellinger } 56c66ac9dbSNicholas Bellinger tmr->task_cmd = se_cmd; 57c66ac9dbSNicholas Bellinger tmr->fabric_tmr_ptr = fabric_tmr_ptr; 58c66ac9dbSNicholas Bellinger tmr->function = function; 59c66ac9dbSNicholas Bellinger INIT_LIST_HEAD(&tmr->tmr_list); 60c66ac9dbSNicholas Bellinger 61c66ac9dbSNicholas Bellinger return tmr; 62c66ac9dbSNicholas Bellinger } 63c66ac9dbSNicholas Bellinger EXPORT_SYMBOL(core_tmr_alloc_req); 64c66ac9dbSNicholas Bellinger 65c66ac9dbSNicholas Bellinger void core_tmr_release_req( 66c66ac9dbSNicholas Bellinger struct se_tmr_req *tmr) 67c66ac9dbSNicholas Bellinger { 68c66ac9dbSNicholas Bellinger struct se_device *dev = tmr->tmr_dev; 69d050ffb9SNicholas Bellinger unsigned long flags; 70c66ac9dbSNicholas Bellinger 717fd29aa9SNicholas Bellinger if (!dev) { 727fd29aa9SNicholas Bellinger kmem_cache_free(se_tmr_req_cache, tmr); 737fd29aa9SNicholas Bellinger return; 747fd29aa9SNicholas Bellinger } 757fd29aa9SNicholas Bellinger 76d050ffb9SNicholas Bellinger spin_lock_irqsave(&dev->se_tmr_lock, flags); 77c66ac9dbSNicholas Bellinger list_del(&tmr->tmr_list); 78d050ffb9SNicholas Bellinger spin_unlock_irqrestore(&dev->se_tmr_lock, flags); 797fd29aa9SNicholas Bellinger 807fd29aa9SNicholas Bellinger kmem_cache_free(se_tmr_req_cache, tmr); 81c66ac9dbSNicholas Bellinger } 82c66ac9dbSNicholas Bellinger 83c66ac9dbSNicholas Bellinger static void core_tmr_handle_tas_abort( 84c66ac9dbSNicholas Bellinger struct se_node_acl *tmr_nacl, 85c66ac9dbSNicholas Bellinger struct se_cmd *cmd, 86c66ac9dbSNicholas Bellinger int tas, 87c66ac9dbSNicholas Bellinger int fe_count) 88c66ac9dbSNicholas Bellinger { 896708bb27SAndy Grover if (!fe_count) { 90c66ac9dbSNicholas Bellinger transport_cmd_finish_abort(cmd, 1); 91c66ac9dbSNicholas Bellinger return; 92c66ac9dbSNicholas Bellinger } 93c66ac9dbSNicholas Bellinger /* 94c66ac9dbSNicholas Bellinger * TASK ABORTED status (TAS) bit support 95c66ac9dbSNicholas Bellinger */ 966708bb27SAndy Grover if ((tmr_nacl && 97c66ac9dbSNicholas Bellinger (tmr_nacl == cmd->se_sess->se_node_acl)) || tas) 98c66ac9dbSNicholas Bellinger transport_send_task_abort(cmd); 99c66ac9dbSNicholas Bellinger 100c66ac9dbSNicholas Bellinger transport_cmd_finish_abort(cmd, 0); 101c66ac9dbSNicholas Bellinger } 102c66ac9dbSNicholas Bellinger 103feae8564SJörn Engel static int target_check_cdb_and_preempt(struct list_head *list, 104c165f69cSJörn Engel struct se_cmd *cmd) 105c165f69cSJörn Engel { 106feae8564SJörn Engel struct t10_pr_registration *reg; 107c165f69cSJörn Engel 108feae8564SJörn Engel if (!list) 109feae8564SJörn Engel return 0; 110feae8564SJörn Engel list_for_each_entry(reg, list, pr_reg_abort_list) { 111feae8564SJörn Engel if (reg->pr_res_key == cmd->pr_res_key) 112c165f69cSJörn Engel return 0; 113c165f69cSJörn Engel } 114c165f69cSJörn Engel 115c165f69cSJörn Engel return 1; 116c165f69cSJörn Engel } 117c165f69cSJörn Engel 118d050ffb9SNicholas Bellinger static void core_tmr_drain_tmr_list( 119c66ac9dbSNicholas Bellinger struct se_device *dev, 120c66ac9dbSNicholas Bellinger struct se_tmr_req *tmr, 121d050ffb9SNicholas Bellinger struct list_head *preempt_and_abort_list) 122c66ac9dbSNicholas Bellinger { 123d050ffb9SNicholas Bellinger LIST_HEAD(drain_tmr_list); 124c66ac9dbSNicholas Bellinger struct se_tmr_req *tmr_p, *tmr_pp; 125d050ffb9SNicholas Bellinger struct se_cmd *cmd; 126c66ac9dbSNicholas Bellinger unsigned long flags; 127c66ac9dbSNicholas Bellinger /* 128c66ac9dbSNicholas Bellinger * Release all pending and outgoing TMRs aside from the received 129c66ac9dbSNicholas Bellinger * LUN_RESET tmr.. 130c66ac9dbSNicholas Bellinger */ 131d050ffb9SNicholas Bellinger spin_lock_irqsave(&dev->se_tmr_lock, flags); 132c66ac9dbSNicholas Bellinger list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { 133c66ac9dbSNicholas Bellinger /* 134c66ac9dbSNicholas Bellinger * Allow the received TMR to return with FUNCTION_COMPLETE. 135c66ac9dbSNicholas Bellinger */ 136abc1fd4fSJoern Engel if (tmr_p == tmr) 137c66ac9dbSNicholas Bellinger continue; 138c66ac9dbSNicholas Bellinger 139c66ac9dbSNicholas Bellinger cmd = tmr_p->task_cmd; 1406708bb27SAndy Grover if (!cmd) { 1416708bb27SAndy Grover pr_err("Unable to locate struct se_cmd for TMR\n"); 142c66ac9dbSNicholas Bellinger continue; 143c66ac9dbSNicholas Bellinger } 144c66ac9dbSNicholas Bellinger /* 145c66ac9dbSNicholas Bellinger * If this function was called with a valid pr_res_key 146c66ac9dbSNicholas Bellinger * parameter (eg: for PROUT PREEMPT_AND_ABORT service action 147c66ac9dbSNicholas Bellinger * skip non regisration key matching TMRs. 148c66ac9dbSNicholas Bellinger */ 149feae8564SJörn Engel if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) 150c66ac9dbSNicholas Bellinger continue; 151c66ac9dbSNicholas Bellinger 152d050ffb9SNicholas Bellinger spin_lock(&cmd->t_state_lock); 1537d680f3bSChristoph Hellwig if (!(cmd->transport_state & CMD_T_ACTIVE)) { 154d050ffb9SNicholas Bellinger spin_unlock(&cmd->t_state_lock); 155c66ac9dbSNicholas Bellinger continue; 156c66ac9dbSNicholas Bellinger } 157c66ac9dbSNicholas Bellinger if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { 158d050ffb9SNicholas Bellinger spin_unlock(&cmd->t_state_lock); 159c66ac9dbSNicholas Bellinger continue; 160c66ac9dbSNicholas Bellinger } 161d050ffb9SNicholas Bellinger spin_unlock(&cmd->t_state_lock); 162d050ffb9SNicholas Bellinger 1636eb40b2aSJoern Engel list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); 164d050ffb9SNicholas Bellinger } 165d050ffb9SNicholas Bellinger spin_unlock_irqrestore(&dev->se_tmr_lock, flags); 166d050ffb9SNicholas Bellinger 167abc1fd4fSJoern Engel list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) { 168b8a11d73SJoern Engel list_del_init(&tmr_p->tmr_list); 169abc1fd4fSJoern Engel cmd = tmr_p->task_cmd; 170d050ffb9SNicholas Bellinger 1716708bb27SAndy Grover pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x," 172c66ac9dbSNicholas Bellinger " Response: 0x%02x, t_state: %d\n", 173abc1fd4fSJoern Engel (preempt_and_abort_list) ? "Preempt" : "", tmr_p, 174abc1fd4fSJoern Engel tmr_p->function, tmr_p->response, cmd->t_state); 175c66ac9dbSNicholas Bellinger 1768dc52b54SNicholas Bellinger transport_cmd_finish_abort(cmd, 1); 177c66ac9dbSNicholas Bellinger } 178d050ffb9SNicholas Bellinger } 179d050ffb9SNicholas Bellinger 180d050ffb9SNicholas Bellinger static void core_tmr_drain_task_list( 181d050ffb9SNicholas Bellinger struct se_device *dev, 182d050ffb9SNicholas Bellinger struct se_cmd *prout_cmd, 183d050ffb9SNicholas Bellinger struct se_node_acl *tmr_nacl, 184d050ffb9SNicholas Bellinger int tas, 185d050ffb9SNicholas Bellinger struct list_head *preempt_and_abort_list) 186d050ffb9SNicholas Bellinger { 187d050ffb9SNicholas Bellinger LIST_HEAD(drain_task_list); 188d050ffb9SNicholas Bellinger struct se_cmd *cmd; 189d050ffb9SNicholas Bellinger struct se_task *task, *task_tmp; 190d050ffb9SNicholas Bellinger unsigned long flags; 191d050ffb9SNicholas Bellinger int fe_count; 192c66ac9dbSNicholas Bellinger /* 193c66ac9dbSNicholas Bellinger * Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status. 194c66ac9dbSNicholas Bellinger * This is following sam4r17, section 5.6 Aborting commands, Table 38 195c66ac9dbSNicholas Bellinger * for TMR LUN_RESET: 196c66ac9dbSNicholas Bellinger * 197c66ac9dbSNicholas Bellinger * a) "Yes" indicates that each command that is aborted on an I_T nexus 198c66ac9dbSNicholas Bellinger * other than the one that caused the SCSI device condition is 199c66ac9dbSNicholas Bellinger * completed with TASK ABORTED status, if the TAS bit is set to one in 200c66ac9dbSNicholas Bellinger * the Control mode page (see SPC-4). "No" indicates that no status is 201c66ac9dbSNicholas Bellinger * returned for aborted commands. 202c66ac9dbSNicholas Bellinger * 203c66ac9dbSNicholas Bellinger * d) If the logical unit reset is caused by a particular I_T nexus 204c66ac9dbSNicholas Bellinger * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" 205c66ac9dbSNicholas Bellinger * (TASK_ABORTED status) applies. 206c66ac9dbSNicholas Bellinger * 207c66ac9dbSNicholas Bellinger * Otherwise (e.g., if triggered by a hard reset), "no" 208c66ac9dbSNicholas Bellinger * (no TASK_ABORTED SAM status) applies. 209c66ac9dbSNicholas Bellinger * 210c66ac9dbSNicholas Bellinger * Note that this seems to be independent of TAS (Task Aborted Status) 211c66ac9dbSNicholas Bellinger * in the Control Mode Page. 212c66ac9dbSNicholas Bellinger */ 213c66ac9dbSNicholas Bellinger spin_lock_irqsave(&dev->execute_task_lock, flags); 214c66ac9dbSNicholas Bellinger list_for_each_entry_safe(task, task_tmp, &dev->state_task_list, 215c66ac9dbSNicholas Bellinger t_state_list) { 216e3d6f909SAndy Grover if (!task->task_se_cmd) { 2176708bb27SAndy Grover pr_err("task->task_se_cmd is NULL!\n"); 218c66ac9dbSNicholas Bellinger continue; 219c66ac9dbSNicholas Bellinger } 220e3d6f909SAndy Grover cmd = task->task_se_cmd; 221c66ac9dbSNicholas Bellinger 222c66ac9dbSNicholas Bellinger /* 223c66ac9dbSNicholas Bellinger * For PREEMPT_AND_ABORT usage, only process commands 224c66ac9dbSNicholas Bellinger * with a matching reservation key. 225c66ac9dbSNicholas Bellinger */ 226feae8564SJörn Engel if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) 227c66ac9dbSNicholas Bellinger continue; 228c66ac9dbSNicholas Bellinger /* 229c66ac9dbSNicholas Bellinger * Not aborting PROUT PREEMPT_AND_ABORT CDB.. 230c66ac9dbSNicholas Bellinger */ 231c66ac9dbSNicholas Bellinger if (prout_cmd == cmd) 232c66ac9dbSNicholas Bellinger continue; 233c66ac9dbSNicholas Bellinger 234d050ffb9SNicholas Bellinger list_move_tail(&task->t_state_list, &drain_task_list); 2351880807aSChristoph Hellwig task->t_state_active = false; 236d050ffb9SNicholas Bellinger /* 237d050ffb9SNicholas Bellinger * Remove from task execute list before processing drain_task_list 238d050ffb9SNicholas Bellinger */ 23904629b7bSChristoph Hellwig if (!list_empty(&task->t_execute_list)) 24004629b7bSChristoph Hellwig __transport_remove_task_from_execute_queue(task, dev); 241d050ffb9SNicholas Bellinger } 242c66ac9dbSNicholas Bellinger spin_unlock_irqrestore(&dev->execute_task_lock, flags); 243c66ac9dbSNicholas Bellinger 244d050ffb9SNicholas Bellinger while (!list_empty(&drain_task_list)) { 245d050ffb9SNicholas Bellinger task = list_entry(drain_task_list.next, struct se_task, t_state_list); 246d050ffb9SNicholas Bellinger list_del(&task->t_state_list); 247d050ffb9SNicholas Bellinger cmd = task->task_se_cmd; 248d050ffb9SNicholas Bellinger 2496708bb27SAndy Grover pr_debug("LUN_RESET: %s cmd: %p task: %p" 250f2da9dbdSChristoph Hellwig " ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d" 251f2da9dbdSChristoph Hellwig "cdb: 0x%02x\n", 252c66ac9dbSNicholas Bellinger (preempt_and_abort_list) ? "Preempt" : "", cmd, task, 253e3d6f909SAndy Grover cmd->se_tfo->get_task_tag(cmd), 0, 254e3d6f909SAndy Grover cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, 255f2da9dbdSChristoph Hellwig cmd->t_task_cdb[0]); 2566708bb27SAndy Grover pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx" 257c66ac9dbSNicholas Bellinger " t_task_cdbs: %d t_task_cdbs_left: %d" 2587d680f3bSChristoph Hellwig " t_task_cdbs_sent: %d -- CMD_T_ACTIVE: %d" 2597d680f3bSChristoph Hellwig " CMD_T_STOP: %d CMD_T_SENT: %d\n", 260e3d6f909SAndy Grover cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key, 261a1d8b49aSAndy Grover cmd->t_task_list_num, 262a1d8b49aSAndy Grover atomic_read(&cmd->t_task_cdbs_left), 263a1d8b49aSAndy Grover atomic_read(&cmd->t_task_cdbs_sent), 2647d680f3bSChristoph Hellwig (cmd->transport_state & CMD_T_ACTIVE) != 0, 2657d680f3bSChristoph Hellwig (cmd->transport_state & CMD_T_STOP) != 0, 2667d680f3bSChristoph Hellwig (cmd->transport_state & CMD_T_SENT) != 0); 267c66ac9dbSNicholas Bellinger 26835e0e757SChristoph Hellwig /* 26935e0e757SChristoph Hellwig * If the command may be queued onto a workqueue cancel it now. 27035e0e757SChristoph Hellwig * 27135e0e757SChristoph Hellwig * This is equivalent to removal from the execute queue in the 27235e0e757SChristoph Hellwig * loop above, but we do it down here given that 27335e0e757SChristoph Hellwig * cancel_work_sync may block. 27435e0e757SChristoph Hellwig */ 27535e0e757SChristoph Hellwig if (cmd->t_state == TRANSPORT_COMPLETE) 27635e0e757SChristoph Hellwig cancel_work_sync(&cmd->work); 27735e0e757SChristoph Hellwig 278a1d8b49aSAndy Grover spin_lock_irqsave(&cmd->t_state_lock, flags); 279cdbb70bbSChristoph Hellwig target_stop_task(task, &flags); 280c66ac9dbSNicholas Bellinger 2816708bb27SAndy Grover if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) { 282d050ffb9SNicholas Bellinger spin_unlock_irqrestore(&cmd->t_state_lock, flags); 2836708bb27SAndy Grover pr_debug("LUN_RESET: Skipping task: %p, dev: %p for" 284c66ac9dbSNicholas Bellinger " t_task_cdbs_ex_left: %d\n", task, dev, 285a1d8b49aSAndy Grover atomic_read(&cmd->t_task_cdbs_ex_left)); 286c66ac9dbSNicholas Bellinger continue; 287c66ac9dbSNicholas Bellinger } 288a1d8b49aSAndy Grover fe_count = atomic_read(&cmd->t_fe_count); 289c66ac9dbSNicholas Bellinger 2907d680f3bSChristoph Hellwig if (!(cmd->transport_state & CMD_T_ACTIVE)) { 2917d680f3bSChristoph Hellwig pr_debug("LUN_RESET: got CMD_T_ACTIVE for" 292c66ac9dbSNicholas Bellinger " task: %p, t_fe_count: %d dev: %p\n", task, 293c66ac9dbSNicholas Bellinger fe_count, dev); 2947d680f3bSChristoph Hellwig cmd->transport_state |= CMD_T_ABORTED; 295d050ffb9SNicholas Bellinger spin_unlock_irqrestore(&cmd->t_state_lock, flags); 296c66ac9dbSNicholas Bellinger 297d050ffb9SNicholas Bellinger core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); 298c66ac9dbSNicholas Bellinger continue; 299c66ac9dbSNicholas Bellinger } 3007d680f3bSChristoph Hellwig pr_debug("LUN_RESET: Got !CMD_T_ACTIVE for task: %p," 301c66ac9dbSNicholas Bellinger " t_fe_count: %d dev: %p\n", task, fe_count, dev); 3027d680f3bSChristoph Hellwig cmd->transport_state |= CMD_T_ABORTED; 303a1d8b49aSAndy Grover spin_unlock_irqrestore(&cmd->t_state_lock, flags); 304c66ac9dbSNicholas Bellinger 305d050ffb9SNicholas Bellinger core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count); 306c66ac9dbSNicholas Bellinger } 307d050ffb9SNicholas Bellinger } 308d050ffb9SNicholas Bellinger 309d050ffb9SNicholas Bellinger static void core_tmr_drain_cmd_list( 310d050ffb9SNicholas Bellinger struct se_device *dev, 311d050ffb9SNicholas Bellinger struct se_cmd *prout_cmd, 312d050ffb9SNicholas Bellinger struct se_node_acl *tmr_nacl, 313d050ffb9SNicholas Bellinger int tas, 314d050ffb9SNicholas Bellinger struct list_head *preempt_and_abort_list) 315d050ffb9SNicholas Bellinger { 316d050ffb9SNicholas Bellinger LIST_HEAD(drain_cmd_list); 317d050ffb9SNicholas Bellinger struct se_queue_obj *qobj = &dev->dev_queue_obj; 318d050ffb9SNicholas Bellinger struct se_cmd *cmd, *tcmd; 319d050ffb9SNicholas Bellinger unsigned long flags; 320c66ac9dbSNicholas Bellinger /* 321c66ac9dbSNicholas Bellinger * Release all commands remaining in the struct se_device cmd queue. 322c66ac9dbSNicholas Bellinger * 323c66ac9dbSNicholas Bellinger * This follows the same logic as above for the struct se_device 324c66ac9dbSNicholas Bellinger * struct se_task state list, where commands are returned with 325c66ac9dbSNicholas Bellinger * TASK_ABORTED status, if there is an outstanding $FABRIC_MOD 326c66ac9dbSNicholas Bellinger * reference, otherwise the struct se_cmd is released. 327c66ac9dbSNicholas Bellinger */ 328c66ac9dbSNicholas Bellinger spin_lock_irqsave(&qobj->cmd_queue_lock, flags); 3295951146dSAndy Grover list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) { 330c66ac9dbSNicholas Bellinger /* 331c66ac9dbSNicholas Bellinger * For PREEMPT_AND_ABORT usage, only process commands 332c66ac9dbSNicholas Bellinger * with a matching reservation key. 333c66ac9dbSNicholas Bellinger */ 334feae8564SJörn Engel if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) 335c66ac9dbSNicholas Bellinger continue; 336c66ac9dbSNicholas Bellinger /* 337c66ac9dbSNicholas Bellinger * Not aborting PROUT PREEMPT_AND_ABORT CDB.. 338c66ac9dbSNicholas Bellinger */ 339c66ac9dbSNicholas Bellinger if (prout_cmd == cmd) 340c66ac9dbSNicholas Bellinger continue; 341c66ac9dbSNicholas Bellinger 3427d680f3bSChristoph Hellwig cmd->transport_state &= ~CMD_T_QUEUED; 343c66ac9dbSNicholas Bellinger atomic_dec(&qobj->queue_cnt); 344d050ffb9SNicholas Bellinger list_move_tail(&cmd->se_queue_node, &drain_cmd_list); 345d050ffb9SNicholas Bellinger } 346c66ac9dbSNicholas Bellinger spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags); 347c66ac9dbSNicholas Bellinger 348d050ffb9SNicholas Bellinger while (!list_empty(&drain_cmd_list)) { 349d050ffb9SNicholas Bellinger cmd = list_entry(drain_cmd_list.next, struct se_cmd, se_queue_node); 350d050ffb9SNicholas Bellinger list_del_init(&cmd->se_queue_node); 351d050ffb9SNicholas Bellinger 3526708bb27SAndy Grover pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:" 353c66ac9dbSNicholas Bellinger " %d t_fe_count: %d\n", (preempt_and_abort_list) ? 3545951146dSAndy Grover "Preempt" : "", cmd, cmd->t_state, 355a1d8b49aSAndy Grover atomic_read(&cmd->t_fe_count)); 356c66ac9dbSNicholas Bellinger 357c66ac9dbSNicholas Bellinger core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, 358a1d8b49aSAndy Grover atomic_read(&cmd->t_fe_count)); 359c66ac9dbSNicholas Bellinger } 360d050ffb9SNicholas Bellinger } 361d050ffb9SNicholas Bellinger 362d050ffb9SNicholas Bellinger int core_tmr_lun_reset( 363d050ffb9SNicholas Bellinger struct se_device *dev, 364d050ffb9SNicholas Bellinger struct se_tmr_req *tmr, 365d050ffb9SNicholas Bellinger struct list_head *preempt_and_abort_list, 366d050ffb9SNicholas Bellinger struct se_cmd *prout_cmd) 367d050ffb9SNicholas Bellinger { 368d050ffb9SNicholas Bellinger struct se_node_acl *tmr_nacl = NULL; 369d050ffb9SNicholas Bellinger struct se_portal_group *tmr_tpg = NULL; 370d050ffb9SNicholas Bellinger int tas; 371d050ffb9SNicholas Bellinger /* 372d050ffb9SNicholas Bellinger * TASK_ABORTED status bit, this is configurable via ConfigFS 373d050ffb9SNicholas Bellinger * struct se_device attributes. spc4r17 section 7.4.6 Control mode page 374d050ffb9SNicholas Bellinger * 375d050ffb9SNicholas Bellinger * A task aborted status (TAS) bit set to zero specifies that aborted 376d050ffb9SNicholas Bellinger * tasks shall be terminated by the device server without any response 377d050ffb9SNicholas Bellinger * to the application client. A TAS bit set to one specifies that tasks 378d050ffb9SNicholas Bellinger * aborted by the actions of an I_T nexus other than the I_T nexus on 379d050ffb9SNicholas Bellinger * which the command was received shall be completed with TASK ABORTED 380d050ffb9SNicholas Bellinger * status (see SAM-4). 381d050ffb9SNicholas Bellinger */ 382d050ffb9SNicholas Bellinger tas = dev->se_sub_dev->se_dev_attrib.emulate_tas; 383d050ffb9SNicholas Bellinger /* 384d050ffb9SNicholas Bellinger * Determine if this se_tmr is coming from a $FABRIC_MOD 385d050ffb9SNicholas Bellinger * or struct se_device passthrough.. 386d050ffb9SNicholas Bellinger */ 387d050ffb9SNicholas Bellinger if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { 388d050ffb9SNicholas Bellinger tmr_nacl = tmr->task_cmd->se_sess->se_node_acl; 389d050ffb9SNicholas Bellinger tmr_tpg = tmr->task_cmd->se_sess->se_tpg; 390d050ffb9SNicholas Bellinger if (tmr_nacl && tmr_tpg) { 391d050ffb9SNicholas Bellinger pr_debug("LUN_RESET: TMR caller fabric: %s" 392d050ffb9SNicholas Bellinger " initiator port %s\n", 393d050ffb9SNicholas Bellinger tmr_tpg->se_tpg_tfo->get_fabric_name(), 394d050ffb9SNicholas Bellinger tmr_nacl->initiatorname); 395d050ffb9SNicholas Bellinger } 396d050ffb9SNicholas Bellinger } 397d050ffb9SNicholas Bellinger pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", 398d050ffb9SNicholas Bellinger (preempt_and_abort_list) ? "Preempt" : "TMR", 399d050ffb9SNicholas Bellinger dev->transport->name, tas); 400d050ffb9SNicholas Bellinger 401d050ffb9SNicholas Bellinger core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); 402d050ffb9SNicholas Bellinger core_tmr_drain_task_list(dev, prout_cmd, tmr_nacl, tas, 403d050ffb9SNicholas Bellinger preempt_and_abort_list); 404d050ffb9SNicholas Bellinger core_tmr_drain_cmd_list(dev, prout_cmd, tmr_nacl, tas, 405d050ffb9SNicholas Bellinger preempt_and_abort_list); 406c66ac9dbSNicholas Bellinger /* 407c66ac9dbSNicholas Bellinger * Clear any legacy SPC-2 reservation when called during 408c66ac9dbSNicholas Bellinger * LOGICAL UNIT RESET 409c66ac9dbSNicholas Bellinger */ 4106708bb27SAndy Grover if (!preempt_and_abort_list && 411c66ac9dbSNicholas Bellinger (dev->dev_flags & DF_SPC2_RESERVATIONS)) { 412c66ac9dbSNicholas Bellinger spin_lock(&dev->dev_reservation_lock); 413c66ac9dbSNicholas Bellinger dev->dev_reserved_node_acl = NULL; 414c66ac9dbSNicholas Bellinger dev->dev_flags &= ~DF_SPC2_RESERVATIONS; 415c66ac9dbSNicholas Bellinger spin_unlock(&dev->dev_reservation_lock); 4166708bb27SAndy Grover pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); 417c66ac9dbSNicholas Bellinger } 418c66ac9dbSNicholas Bellinger 4191e7de68cSNicholas Bellinger spin_lock_irq(&dev->stats_lock); 420c66ac9dbSNicholas Bellinger dev->num_resets++; 4211e7de68cSNicholas Bellinger spin_unlock_irq(&dev->stats_lock); 422c66ac9dbSNicholas Bellinger 4236708bb27SAndy Grover pr_debug("LUN_RESET: %s for [%s] Complete\n", 424c66ac9dbSNicholas Bellinger (preempt_and_abort_list) ? "Preempt" : "TMR", 425e3d6f909SAndy Grover dev->transport->name); 426c66ac9dbSNicholas Bellinger return 0; 427c66ac9dbSNicholas Bellinger } 428d050ffb9SNicholas Bellinger 429