1c66ac9dbSNicholas Bellinger /******************************************************************************* 2c66ac9dbSNicholas Bellinger * Filename: target_core_tmr.c 3c66ac9dbSNicholas Bellinger * 4c66ac9dbSNicholas Bellinger * This file contains SPC-3 task management infrastructure 5c66ac9dbSNicholas Bellinger * 64c76251eSNicholas Bellinger * (c) Copyright 2009-2013 Datera, Inc. 7c66ac9dbSNicholas Bellinger * 8c66ac9dbSNicholas Bellinger * Nicholas A. Bellinger <nab@kernel.org> 9c66ac9dbSNicholas Bellinger * 10c66ac9dbSNicholas Bellinger * This program is free software; you can redistribute it and/or modify 11c66ac9dbSNicholas Bellinger * it under the terms of the GNU General Public License as published by 12c66ac9dbSNicholas Bellinger * the Free Software Foundation; either version 2 of the License, or 13c66ac9dbSNicholas Bellinger * (at your option) any later version. 14c66ac9dbSNicholas Bellinger * 15c66ac9dbSNicholas Bellinger * This program is distributed in the hope that it will be useful, 16c66ac9dbSNicholas Bellinger * but WITHOUT ANY WARRANTY; without even the implied warranty of 17c66ac9dbSNicholas Bellinger * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18c66ac9dbSNicholas Bellinger * GNU General Public License for more details. 19c66ac9dbSNicholas Bellinger * 20c66ac9dbSNicholas Bellinger * You should have received a copy of the GNU General Public License 21c66ac9dbSNicholas Bellinger * along with this program; if not, write to the Free Software 22c66ac9dbSNicholas Bellinger * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 23c66ac9dbSNicholas Bellinger * 24c66ac9dbSNicholas Bellinger ******************************************************************************/ 25c66ac9dbSNicholas Bellinger 26c66ac9dbSNicholas Bellinger #include <linux/slab.h> 27c66ac9dbSNicholas Bellinger #include <linux/spinlock.h> 28c66ac9dbSNicholas Bellinger #include <linux/list.h> 29c53181afSPaul Gortmaker #include <linux/export.h> 30c66ac9dbSNicholas Bellinger #include <scsi/scsi.h> 31c66ac9dbSNicholas Bellinger #include <scsi/scsi_cmnd.h> 32c66ac9dbSNicholas Bellinger 33c66ac9dbSNicholas Bellinger #include <target/target_core_base.h> 34c4795fb2SChristoph Hellwig #include <target/target_core_backend.h> 35c4795fb2SChristoph Hellwig #include <target/target_core_fabric.h> 36c66ac9dbSNicholas Bellinger #include <target/target_core_configfs.h> 37c66ac9dbSNicholas Bellinger 38e26d99aeSChristoph Hellwig #include "target_core_internal.h" 39c66ac9dbSNicholas Bellinger #include "target_core_alua.h" 40c66ac9dbSNicholas Bellinger #include "target_core_pr.h" 41c66ac9dbSNicholas Bellinger 42c8e31f26SAndy Grover int core_tmr_alloc_req( 43c66ac9dbSNicholas Bellinger struct se_cmd *se_cmd, 44c66ac9dbSNicholas Bellinger void *fabric_tmr_ptr, 45dd503a5fSRoland Dreier u8 function, 46dd503a5fSRoland Dreier gfp_t gfp_flags) 47c66ac9dbSNicholas Bellinger { 48c66ac9dbSNicholas Bellinger struct se_tmr_req *tmr; 49c66ac9dbSNicholas Bellinger 50c8e31f26SAndy Grover tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags); 516708bb27SAndy Grover if (!tmr) { 526708bb27SAndy Grover pr_err("Unable to allocate struct se_tmr_req\n"); 53c8e31f26SAndy Grover return -ENOMEM; 54c66ac9dbSNicholas Bellinger } 55c8e31f26SAndy Grover 56c8e31f26SAndy Grover se_cmd->se_cmd_flags |= SCF_SCSI_TMR_CDB; 57c8e31f26SAndy Grover se_cmd->se_tmr_req = tmr; 58c66ac9dbSNicholas Bellinger tmr->task_cmd = se_cmd; 59c66ac9dbSNicholas Bellinger tmr->fabric_tmr_ptr = fabric_tmr_ptr; 60c66ac9dbSNicholas Bellinger tmr->function = function; 61c66ac9dbSNicholas Bellinger INIT_LIST_HEAD(&tmr->tmr_list); 62c66ac9dbSNicholas Bellinger 63c8e31f26SAndy Grover return 0; 64c66ac9dbSNicholas Bellinger } 65c66ac9dbSNicholas Bellinger EXPORT_SYMBOL(core_tmr_alloc_req); 66c66ac9dbSNicholas Bellinger 678f832690SJoern Engel void core_tmr_release_req(struct se_tmr_req *tmr) 68c66ac9dbSNicholas Bellinger { 69c66ac9dbSNicholas Bellinger struct se_device *dev = tmr->tmr_dev; 70d050ffb9SNicholas Bellinger unsigned long flags; 71c66ac9dbSNicholas Bellinger 728f832690SJoern Engel if (dev) { 73d050ffb9SNicholas Bellinger spin_lock_irqsave(&dev->se_tmr_lock, flags); 74c66ac9dbSNicholas Bellinger list_del(&tmr->tmr_list); 75d050ffb9SNicholas Bellinger spin_unlock_irqrestore(&dev->se_tmr_lock, flags); 768f832690SJoern Engel } 777fd29aa9SNicholas Bellinger 78c8e31f26SAndy Grover kfree(tmr); 79c66ac9dbSNicholas Bellinger } 80c66ac9dbSNicholas Bellinger 81c66ac9dbSNicholas Bellinger static void core_tmr_handle_tas_abort( 82c66ac9dbSNicholas Bellinger struct se_node_acl *tmr_nacl, 83c66ac9dbSNicholas Bellinger struct se_cmd *cmd, 84c1c35d52SNicholas Bellinger int tas) 85c66ac9dbSNicholas Bellinger { 8668259b5aSAlex Leung bool remove = true; 87c66ac9dbSNicholas Bellinger /* 88c66ac9dbSNicholas Bellinger * TASK ABORTED status (TAS) bit support 89c66ac9dbSNicholas Bellinger */ 908f832690SJoern Engel if ((tmr_nacl && (tmr_nacl != cmd->se_sess->se_node_acl)) && tas) { 9168259b5aSAlex Leung remove = false; 92c66ac9dbSNicholas Bellinger transport_send_task_abort(cmd); 9368259b5aSAlex Leung } 94c66ac9dbSNicholas Bellinger 9568259b5aSAlex Leung transport_cmd_finish_abort(cmd, remove); 96c66ac9dbSNicholas Bellinger } 97c66ac9dbSNicholas Bellinger 98feae8564SJörn Engel static int target_check_cdb_and_preempt(struct list_head *list, 99c165f69cSJörn Engel struct se_cmd *cmd) 100c165f69cSJörn Engel { 101feae8564SJörn Engel struct t10_pr_registration *reg; 102c165f69cSJörn Engel 103feae8564SJörn Engel if (!list) 104feae8564SJörn Engel return 0; 105feae8564SJörn Engel list_for_each_entry(reg, list, pr_reg_abort_list) { 106feae8564SJörn Engel if (reg->pr_res_key == cmd->pr_res_key) 107c165f69cSJörn Engel return 0; 108c165f69cSJörn Engel } 109c165f69cSJörn Engel 110c165f69cSJörn Engel return 1; 111c165f69cSJörn Engel } 112c165f69cSJörn Engel 1133d28934aSNicholas Bellinger void core_tmr_abort_task( 1143d28934aSNicholas Bellinger struct se_device *dev, 1153d28934aSNicholas Bellinger struct se_tmr_req *tmr, 1163d28934aSNicholas Bellinger struct se_session *se_sess) 1173d28934aSNicholas Bellinger { 118f81ccb48SJoern Engel struct se_cmd *se_cmd; 1193d28934aSNicholas Bellinger unsigned long flags; 120649ee054SBart Van Assche u64 ref_tag; 1213d28934aSNicholas Bellinger 1223d28934aSNicholas Bellinger spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); 123f81ccb48SJoern Engel list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) { 1243d28934aSNicholas Bellinger 1253d28934aSNicholas Bellinger if (dev != se_cmd->se_dev) 1263d28934aSNicholas Bellinger continue; 12747b1584cSAlex Leung 128dc0fafdaSBart Van Assche /* skip task management functions, including tmr->task_cmd */ 129dc0fafdaSBart Van Assche if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 13047b1584cSAlex Leung continue; 13147b1584cSAlex Leung 132649ee054SBart Van Assche ref_tag = se_cmd->tag; 1333d28934aSNicholas Bellinger if (tmr->ref_task_tag != ref_tag) 1343d28934aSNicholas Bellinger continue; 1353d28934aSNicholas Bellinger 136649ee054SBart Van Assche printk("ABORT_TASK: Found referenced %s task_tag: %llu\n", 1373d28934aSNicholas Bellinger se_cmd->se_tfo->get_fabric_name(), ref_tag); 1383d28934aSNicholas Bellinger 139ab74b3d6SSteve Hodgson spin_lock(&se_cmd->t_state_lock); 1403d28934aSNicholas Bellinger if (se_cmd->transport_state & CMD_T_COMPLETE) { 141649ee054SBart Van Assche printk("ABORT_TASK: ref_tag: %llu already complete," 142649ee054SBart Van Assche " skipping\n", ref_tag); 143ab74b3d6SSteve Hodgson spin_unlock(&se_cmd->t_state_lock); 1443d28934aSNicholas Bellinger spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 1453d28934aSNicholas Bellinger goto out; 1463d28934aSNicholas Bellinger } 1473d28934aSNicholas Bellinger se_cmd->transport_state |= CMD_T_ABORTED; 148ab74b3d6SSteve Hodgson spin_unlock(&se_cmd->t_state_lock); 1493d28934aSNicholas Bellinger 1503d28934aSNicholas Bellinger list_del_init(&se_cmd->se_cmd_list); 1513d28934aSNicholas Bellinger kref_get(&se_cmd->cmd_kref); 1523d28934aSNicholas Bellinger spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 1533d28934aSNicholas Bellinger 1543d28934aSNicholas Bellinger cancel_work_sync(&se_cmd->work); 1553d28934aSNicholas Bellinger transport_wait_for_tasks(se_cmd); 1563d28934aSNicholas Bellinger 157afc16604SBart Van Assche target_put_sess_cmd(se_cmd); 15868259b5aSAlex Leung transport_cmd_finish_abort(se_cmd, true); 1593d28934aSNicholas Bellinger 1603d28934aSNicholas Bellinger printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for" 161649ee054SBart Van Assche " ref_tag: %llu\n", ref_tag); 1623d28934aSNicholas Bellinger tmr->response = TMR_FUNCTION_COMPLETE; 1633d28934aSNicholas Bellinger return; 1643d28934aSNicholas Bellinger } 1653d28934aSNicholas Bellinger spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 1663d28934aSNicholas Bellinger 1673d28934aSNicholas Bellinger out: 168649ee054SBart Van Assche printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n", 1693d28934aSNicholas Bellinger tmr->ref_task_tag); 1703d28934aSNicholas Bellinger tmr->response = TMR_TASK_DOES_NOT_EXIST; 1713d28934aSNicholas Bellinger } 1723d28934aSNicholas Bellinger 173d050ffb9SNicholas Bellinger static void core_tmr_drain_tmr_list( 174c66ac9dbSNicholas Bellinger struct se_device *dev, 175c66ac9dbSNicholas Bellinger struct se_tmr_req *tmr, 176d050ffb9SNicholas Bellinger struct list_head *preempt_and_abort_list) 177c66ac9dbSNicholas Bellinger { 178d050ffb9SNicholas Bellinger LIST_HEAD(drain_tmr_list); 179c66ac9dbSNicholas Bellinger struct se_tmr_req *tmr_p, *tmr_pp; 180d050ffb9SNicholas Bellinger struct se_cmd *cmd; 181c66ac9dbSNicholas Bellinger unsigned long flags; 182c66ac9dbSNicholas Bellinger /* 183c66ac9dbSNicholas Bellinger * Release all pending and outgoing TMRs aside from the received 184c66ac9dbSNicholas Bellinger * LUN_RESET tmr.. 185c66ac9dbSNicholas Bellinger */ 186d050ffb9SNicholas Bellinger spin_lock_irqsave(&dev->se_tmr_lock, flags); 187c66ac9dbSNicholas Bellinger list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { 188c66ac9dbSNicholas Bellinger /* 189c66ac9dbSNicholas Bellinger * Allow the received TMR to return with FUNCTION_COMPLETE. 190c66ac9dbSNicholas Bellinger */ 191abc1fd4fSJoern Engel if (tmr_p == tmr) 192c66ac9dbSNicholas Bellinger continue; 193c66ac9dbSNicholas Bellinger 194c66ac9dbSNicholas Bellinger cmd = tmr_p->task_cmd; 1956708bb27SAndy Grover if (!cmd) { 1966708bb27SAndy Grover pr_err("Unable to locate struct se_cmd for TMR\n"); 197c66ac9dbSNicholas Bellinger continue; 198c66ac9dbSNicholas Bellinger } 199c66ac9dbSNicholas Bellinger /* 200c66ac9dbSNicholas Bellinger * If this function was called with a valid pr_res_key 201c66ac9dbSNicholas Bellinger * parameter (eg: for PROUT PREEMPT_AND_ABORT service action 202c66ac9dbSNicholas Bellinger * skip non regisration key matching TMRs. 203c66ac9dbSNicholas Bellinger */ 204feae8564SJörn Engel if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) 205c66ac9dbSNicholas Bellinger continue; 206c66ac9dbSNicholas Bellinger 207d050ffb9SNicholas Bellinger spin_lock(&cmd->t_state_lock); 2087d680f3bSChristoph Hellwig if (!(cmd->transport_state & CMD_T_ACTIVE)) { 209d050ffb9SNicholas Bellinger spin_unlock(&cmd->t_state_lock); 210c66ac9dbSNicholas Bellinger continue; 211c66ac9dbSNicholas Bellinger } 212c66ac9dbSNicholas Bellinger if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { 213d050ffb9SNicholas Bellinger spin_unlock(&cmd->t_state_lock); 214c66ac9dbSNicholas Bellinger continue; 215c66ac9dbSNicholas Bellinger } 216d050ffb9SNicholas Bellinger spin_unlock(&cmd->t_state_lock); 217d050ffb9SNicholas Bellinger 2186eb40b2aSJoern Engel list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); 219d050ffb9SNicholas Bellinger } 220d050ffb9SNicholas Bellinger spin_unlock_irqrestore(&dev->se_tmr_lock, flags); 221d050ffb9SNicholas Bellinger 222abc1fd4fSJoern Engel list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) { 223b8a11d73SJoern Engel list_del_init(&tmr_p->tmr_list); 224abc1fd4fSJoern Engel cmd = tmr_p->task_cmd; 225d050ffb9SNicholas Bellinger 2266708bb27SAndy Grover pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x," 227c66ac9dbSNicholas Bellinger " Response: 0x%02x, t_state: %d\n", 228abc1fd4fSJoern Engel (preempt_and_abort_list) ? "Preempt" : "", tmr_p, 229abc1fd4fSJoern Engel tmr_p->function, tmr_p->response, cmd->t_state); 230c66ac9dbSNicholas Bellinger 2318dc52b54SNicholas Bellinger transport_cmd_finish_abort(cmd, 1); 232c66ac9dbSNicholas Bellinger } 233d050ffb9SNicholas Bellinger } 234d050ffb9SNicholas Bellinger 235cf572a96SChristoph Hellwig static void core_tmr_drain_state_list( 236d050ffb9SNicholas Bellinger struct se_device *dev, 237d050ffb9SNicholas Bellinger struct se_cmd *prout_cmd, 238d050ffb9SNicholas Bellinger struct se_node_acl *tmr_nacl, 239d050ffb9SNicholas Bellinger int tas, 240d050ffb9SNicholas Bellinger struct list_head *preempt_and_abort_list) 241d050ffb9SNicholas Bellinger { 242d050ffb9SNicholas Bellinger LIST_HEAD(drain_task_list); 243cf572a96SChristoph Hellwig struct se_cmd *cmd, *next; 244d050ffb9SNicholas Bellinger unsigned long flags; 245cf572a96SChristoph Hellwig 246c66ac9dbSNicholas Bellinger /* 247cf572a96SChristoph Hellwig * Complete outstanding commands with TASK_ABORTED SAM status. 248cf572a96SChristoph Hellwig * 249c66ac9dbSNicholas Bellinger * This is following sam4r17, section 5.6 Aborting commands, Table 38 250c66ac9dbSNicholas Bellinger * for TMR LUN_RESET: 251c66ac9dbSNicholas Bellinger * 252c66ac9dbSNicholas Bellinger * a) "Yes" indicates that each command that is aborted on an I_T nexus 253c66ac9dbSNicholas Bellinger * other than the one that caused the SCSI device condition is 254c66ac9dbSNicholas Bellinger * completed with TASK ABORTED status, if the TAS bit is set to one in 255c66ac9dbSNicholas Bellinger * the Control mode page (see SPC-4). "No" indicates that no status is 256c66ac9dbSNicholas Bellinger * returned for aborted commands. 257c66ac9dbSNicholas Bellinger * 258c66ac9dbSNicholas Bellinger * d) If the logical unit reset is caused by a particular I_T nexus 259c66ac9dbSNicholas Bellinger * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" 260c66ac9dbSNicholas Bellinger * (TASK_ABORTED status) applies. 261c66ac9dbSNicholas Bellinger * 262c66ac9dbSNicholas Bellinger * Otherwise (e.g., if triggered by a hard reset), "no" 263c66ac9dbSNicholas Bellinger * (no TASK_ABORTED SAM status) applies. 264c66ac9dbSNicholas Bellinger * 265c66ac9dbSNicholas Bellinger * Note that this seems to be independent of TAS (Task Aborted Status) 266c66ac9dbSNicholas Bellinger * in the Control Mode Page. 267c66ac9dbSNicholas Bellinger */ 268c66ac9dbSNicholas Bellinger spin_lock_irqsave(&dev->execute_task_lock, flags); 269cf572a96SChristoph Hellwig list_for_each_entry_safe(cmd, next, &dev->state_list, state_list) { 270c66ac9dbSNicholas Bellinger /* 271c66ac9dbSNicholas Bellinger * For PREEMPT_AND_ABORT usage, only process commands 272c66ac9dbSNicholas Bellinger * with a matching reservation key. 273c66ac9dbSNicholas Bellinger */ 274feae8564SJörn Engel if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) 275c66ac9dbSNicholas Bellinger continue; 276cf572a96SChristoph Hellwig 277c66ac9dbSNicholas Bellinger /* 278c66ac9dbSNicholas Bellinger * Not aborting PROUT PREEMPT_AND_ABORT CDB.. 279c66ac9dbSNicholas Bellinger */ 280c66ac9dbSNicholas Bellinger if (prout_cmd == cmd) 281c66ac9dbSNicholas Bellinger continue; 282c66ac9dbSNicholas Bellinger 283cf572a96SChristoph Hellwig list_move_tail(&cmd->state_list, &drain_task_list); 284cf572a96SChristoph Hellwig cmd->state_active = false; 285d050ffb9SNicholas Bellinger } 286c66ac9dbSNicholas Bellinger spin_unlock_irqrestore(&dev->execute_task_lock, flags); 287c66ac9dbSNicholas Bellinger 288d050ffb9SNicholas Bellinger while (!list_empty(&drain_task_list)) { 289cf572a96SChristoph Hellwig cmd = list_entry(drain_task_list.next, struct se_cmd, state_list); 290cf572a96SChristoph Hellwig list_del(&cmd->state_list); 291d050ffb9SNicholas Bellinger 292cf572a96SChristoph Hellwig pr_debug("LUN_RESET: %s cmd: %p" 293649ee054SBart Van Assche " ITT/CmdSN: 0x%08llx/0x%08x, i_state: %d, t_state: %d" 294f2da9dbdSChristoph Hellwig "cdb: 0x%02x\n", 295cf572a96SChristoph Hellwig (preempt_and_abort_list) ? "Preempt" : "", cmd, 296649ee054SBart Van Assche cmd->tag, 0, 297e3d6f909SAndy Grover cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, 298f2da9dbdSChristoph Hellwig cmd->t_task_cdb[0]); 299649ee054SBart Van Assche pr_debug("LUN_RESET: ITT[0x%08llx] - pr_res_key: 0x%016Lx" 300785fdf70SChristoph Hellwig " -- CMD_T_ACTIVE: %d" 3017d680f3bSChristoph Hellwig " CMD_T_STOP: %d CMD_T_SENT: %d\n", 302649ee054SBart Van Assche cmd->tag, cmd->pr_res_key, 3037d680f3bSChristoph Hellwig (cmd->transport_state & CMD_T_ACTIVE) != 0, 3047d680f3bSChristoph Hellwig (cmd->transport_state & CMD_T_STOP) != 0, 3057d680f3bSChristoph Hellwig (cmd->transport_state & CMD_T_SENT) != 0); 306c66ac9dbSNicholas Bellinger 30735e0e757SChristoph Hellwig /* 30835e0e757SChristoph Hellwig * If the command may be queued onto a workqueue cancel it now. 30935e0e757SChristoph Hellwig * 31035e0e757SChristoph Hellwig * This is equivalent to removal from the execute queue in the 31135e0e757SChristoph Hellwig * loop above, but we do it down here given that 31235e0e757SChristoph Hellwig * cancel_work_sync may block. 31335e0e757SChristoph Hellwig */ 31435e0e757SChristoph Hellwig if (cmd->t_state == TRANSPORT_COMPLETE) 31535e0e757SChristoph Hellwig cancel_work_sync(&cmd->work); 31635e0e757SChristoph Hellwig 317a1d8b49aSAndy Grover spin_lock_irqsave(&cmd->t_state_lock, flags); 318cf572a96SChristoph Hellwig target_stop_cmd(cmd, &flags); 319c66ac9dbSNicholas Bellinger 3207d680f3bSChristoph Hellwig cmd->transport_state |= CMD_T_ABORTED; 321a1d8b49aSAndy Grover spin_unlock_irqrestore(&cmd->t_state_lock, flags); 322c66ac9dbSNicholas Bellinger 323c1c35d52SNicholas Bellinger core_tmr_handle_tas_abort(tmr_nacl, cmd, tas); 324c66ac9dbSNicholas Bellinger } 325d050ffb9SNicholas Bellinger } 326d050ffb9SNicholas Bellinger 327d050ffb9SNicholas Bellinger int core_tmr_lun_reset( 328d050ffb9SNicholas Bellinger struct se_device *dev, 329d050ffb9SNicholas Bellinger struct se_tmr_req *tmr, 330d050ffb9SNicholas Bellinger struct list_head *preempt_and_abort_list, 331d050ffb9SNicholas Bellinger struct se_cmd *prout_cmd) 332d050ffb9SNicholas Bellinger { 333d050ffb9SNicholas Bellinger struct se_node_acl *tmr_nacl = NULL; 334d050ffb9SNicholas Bellinger struct se_portal_group *tmr_tpg = NULL; 335d050ffb9SNicholas Bellinger int tas; 336d050ffb9SNicholas Bellinger /* 337d050ffb9SNicholas Bellinger * TASK_ABORTED status bit, this is configurable via ConfigFS 338d050ffb9SNicholas Bellinger * struct se_device attributes. spc4r17 section 7.4.6 Control mode page 339d050ffb9SNicholas Bellinger * 340d050ffb9SNicholas Bellinger * A task aborted status (TAS) bit set to zero specifies that aborted 341d050ffb9SNicholas Bellinger * tasks shall be terminated by the device server without any response 342d050ffb9SNicholas Bellinger * to the application client. A TAS bit set to one specifies that tasks 343d050ffb9SNicholas Bellinger * aborted by the actions of an I_T nexus other than the I_T nexus on 344d050ffb9SNicholas Bellinger * which the command was received shall be completed with TASK ABORTED 345d050ffb9SNicholas Bellinger * status (see SAM-4). 346d050ffb9SNicholas Bellinger */ 3470fd97ccfSChristoph Hellwig tas = dev->dev_attrib.emulate_tas; 348d050ffb9SNicholas Bellinger /* 349d050ffb9SNicholas Bellinger * Determine if this se_tmr is coming from a $FABRIC_MOD 350d050ffb9SNicholas Bellinger * or struct se_device passthrough.. 351d050ffb9SNicholas Bellinger */ 352d050ffb9SNicholas Bellinger if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { 353d050ffb9SNicholas Bellinger tmr_nacl = tmr->task_cmd->se_sess->se_node_acl; 354d050ffb9SNicholas Bellinger tmr_tpg = tmr->task_cmd->se_sess->se_tpg; 355d050ffb9SNicholas Bellinger if (tmr_nacl && tmr_tpg) { 356d050ffb9SNicholas Bellinger pr_debug("LUN_RESET: TMR caller fabric: %s" 357d050ffb9SNicholas Bellinger " initiator port %s\n", 358d050ffb9SNicholas Bellinger tmr_tpg->se_tpg_tfo->get_fabric_name(), 359d050ffb9SNicholas Bellinger tmr_nacl->initiatorname); 360d050ffb9SNicholas Bellinger } 361d050ffb9SNicholas Bellinger } 362d050ffb9SNicholas Bellinger pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", 363d050ffb9SNicholas Bellinger (preempt_and_abort_list) ? "Preempt" : "TMR", 364d050ffb9SNicholas Bellinger dev->transport->name, tas); 365d050ffb9SNicholas Bellinger 366d050ffb9SNicholas Bellinger core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); 367cf572a96SChristoph Hellwig core_tmr_drain_state_list(dev, prout_cmd, tmr_nacl, tas, 368d050ffb9SNicholas Bellinger preempt_and_abort_list); 369af877292SChristoph Hellwig 370c66ac9dbSNicholas Bellinger /* 371c66ac9dbSNicholas Bellinger * Clear any legacy SPC-2 reservation when called during 372c66ac9dbSNicholas Bellinger * LOGICAL UNIT RESET 373c66ac9dbSNicholas Bellinger */ 3746708bb27SAndy Grover if (!preempt_and_abort_list && 3750fd97ccfSChristoph Hellwig (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) { 376c66ac9dbSNicholas Bellinger spin_lock(&dev->dev_reservation_lock); 377c66ac9dbSNicholas Bellinger dev->dev_reserved_node_acl = NULL; 3780fd97ccfSChristoph Hellwig dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 379c66ac9dbSNicholas Bellinger spin_unlock(&dev->dev_reservation_lock); 3806708bb27SAndy Grover pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); 381c66ac9dbSNicholas Bellinger } 382c66ac9dbSNicholas Bellinger 383ee480683SNicholas Bellinger atomic_long_inc(&dev->num_resets); 384c66ac9dbSNicholas Bellinger 3856708bb27SAndy Grover pr_debug("LUN_RESET: %s for [%s] Complete\n", 386c66ac9dbSNicholas Bellinger (preempt_and_abort_list) ? "Preempt" : "TMR", 387e3d6f909SAndy Grover dev->transport->name); 388c66ac9dbSNicholas Bellinger return 0; 389c66ac9dbSNicholas Bellinger } 390d050ffb9SNicholas Bellinger 391