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 31c66ac9dbSNicholas Bellinger #include <target/target_core_base.h> 32c4795fb2SChristoph Hellwig #include <target/target_core_backend.h> 33c4795fb2SChristoph Hellwig #include <target/target_core_fabric.h> 34c66ac9dbSNicholas Bellinger 35e26d99aeSChristoph Hellwig #include "target_core_internal.h" 36c66ac9dbSNicholas Bellinger #include "target_core_alua.h" 37c66ac9dbSNicholas Bellinger #include "target_core_pr.h" 38c66ac9dbSNicholas Bellinger 39c8e31f26SAndy Grover int core_tmr_alloc_req( 40c66ac9dbSNicholas Bellinger struct se_cmd *se_cmd, 41c66ac9dbSNicholas Bellinger void *fabric_tmr_ptr, 42dd503a5fSRoland Dreier u8 function, 43dd503a5fSRoland Dreier gfp_t gfp_flags) 44c66ac9dbSNicholas Bellinger { 45c66ac9dbSNicholas Bellinger struct se_tmr_req *tmr; 46c66ac9dbSNicholas Bellinger 47c8e31f26SAndy Grover tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags); 486708bb27SAndy Grover if (!tmr) { 496708bb27SAndy Grover pr_err("Unable to allocate struct se_tmr_req\n"); 50c8e31f26SAndy Grover return -ENOMEM; 51c66ac9dbSNicholas Bellinger } 52c8e31f26SAndy Grover 53c8e31f26SAndy Grover se_cmd->se_cmd_flags |= SCF_SCSI_TMR_CDB; 54c8e31f26SAndy Grover se_cmd->se_tmr_req = tmr; 55c66ac9dbSNicholas Bellinger tmr->task_cmd = se_cmd; 56c66ac9dbSNicholas Bellinger tmr->fabric_tmr_ptr = fabric_tmr_ptr; 57c66ac9dbSNicholas Bellinger tmr->function = function; 58c66ac9dbSNicholas Bellinger INIT_LIST_HEAD(&tmr->tmr_list); 59c66ac9dbSNicholas Bellinger 60c8e31f26SAndy Grover return 0; 61c66ac9dbSNicholas Bellinger } 62c66ac9dbSNicholas Bellinger EXPORT_SYMBOL(core_tmr_alloc_req); 63c66ac9dbSNicholas Bellinger 648f832690SJoern Engel void core_tmr_release_req(struct se_tmr_req *tmr) 65c66ac9dbSNicholas Bellinger { 66c66ac9dbSNicholas Bellinger struct se_device *dev = tmr->tmr_dev; 67d050ffb9SNicholas Bellinger unsigned long flags; 68c66ac9dbSNicholas Bellinger 698f832690SJoern Engel if (dev) { 70d050ffb9SNicholas Bellinger spin_lock_irqsave(&dev->se_tmr_lock, flags); 71a6d9bb1cSNicholas Bellinger list_del_init(&tmr->tmr_list); 72d050ffb9SNicholas Bellinger spin_unlock_irqrestore(&dev->se_tmr_lock, flags); 738f832690SJoern Engel } 747fd29aa9SNicholas Bellinger 75c8e31f26SAndy Grover kfree(tmr); 76c66ac9dbSNicholas Bellinger } 77c66ac9dbSNicholas Bellinger 780f4a9431SNicholas Bellinger static void core_tmr_handle_tas_abort(struct se_cmd *cmd, int tas) 79c66ac9dbSNicholas Bellinger { 800f4a9431SNicholas Bellinger unsigned long flags; 810f4a9431SNicholas Bellinger bool remove = true, send_tas; 82c66ac9dbSNicholas Bellinger /* 83c66ac9dbSNicholas Bellinger * TASK ABORTED status (TAS) bit support 84c66ac9dbSNicholas Bellinger */ 850f4a9431SNicholas Bellinger spin_lock_irqsave(&cmd->t_state_lock, flags); 860f4a9431SNicholas Bellinger send_tas = (cmd->transport_state & CMD_T_TAS); 870f4a9431SNicholas Bellinger spin_unlock_irqrestore(&cmd->t_state_lock, flags); 880f4a9431SNicholas Bellinger 890f4a9431SNicholas Bellinger if (send_tas) { 9068259b5aSAlex Leung remove = false; 91c66ac9dbSNicholas Bellinger transport_send_task_abort(cmd); 9268259b5aSAlex Leung } 93c66ac9dbSNicholas Bellinger 9468259b5aSAlex Leung transport_cmd_finish_abort(cmd, remove); 95c66ac9dbSNicholas Bellinger } 96c66ac9dbSNicholas Bellinger 97feae8564SJörn Engel static int target_check_cdb_and_preempt(struct list_head *list, 98c165f69cSJörn Engel struct se_cmd *cmd) 99c165f69cSJörn Engel { 100feae8564SJörn Engel struct t10_pr_registration *reg; 101c165f69cSJörn Engel 102feae8564SJörn Engel if (!list) 103feae8564SJörn Engel return 0; 104feae8564SJörn Engel list_for_each_entry(reg, list, pr_reg_abort_list) { 105feae8564SJörn Engel if (reg->pr_res_key == cmd->pr_res_key) 106c165f69cSJörn Engel return 0; 107c165f69cSJörn Engel } 108c165f69cSJörn Engel 109c165f69cSJörn Engel return 1; 110c165f69cSJörn Engel } 111c165f69cSJörn Engel 1120f4a9431SNicholas Bellinger static bool __target_check_io_state(struct se_cmd *se_cmd, 1130f4a9431SNicholas Bellinger struct se_session *tmr_sess, int tas) 114febe562cSNicholas Bellinger { 115febe562cSNicholas Bellinger struct se_session *sess = se_cmd->se_sess; 116febe562cSNicholas Bellinger 117febe562cSNicholas Bellinger assert_spin_locked(&sess->sess_cmd_lock); 118febe562cSNicholas Bellinger WARN_ON_ONCE(!irqs_disabled()); 119febe562cSNicholas Bellinger /* 120febe562cSNicholas Bellinger * If command already reached CMD_T_COMPLETE state within 1210f4a9431SNicholas Bellinger * target_complete_cmd() or CMD_T_FABRIC_STOP due to shutdown, 1220f4a9431SNicholas Bellinger * this se_cmd has been passed to fabric driver and will 1230f4a9431SNicholas Bellinger * not be aborted. 124febe562cSNicholas Bellinger * 125febe562cSNicholas Bellinger * Otherwise, obtain a local se_cmd->cmd_kref now for TMR 126febe562cSNicholas Bellinger * ABORT_TASK + LUN_RESET for CMD_T_ABORTED processing as 127febe562cSNicholas Bellinger * long as se_cmd->cmd_kref is still active unless zero. 128febe562cSNicholas Bellinger */ 129febe562cSNicholas Bellinger spin_lock(&se_cmd->t_state_lock); 1300f4a9431SNicholas Bellinger if (se_cmd->transport_state & (CMD_T_COMPLETE | CMD_T_FABRIC_STOP)) { 1310f4a9431SNicholas Bellinger pr_debug("Attempted to abort io tag: %llu already complete or" 1320f4a9431SNicholas Bellinger " fabric stop, skipping\n", se_cmd->tag); 1330f4a9431SNicholas Bellinger spin_unlock(&se_cmd->t_state_lock); 1340f4a9431SNicholas Bellinger return false; 1350f4a9431SNicholas Bellinger } 1360f4a9431SNicholas Bellinger if (sess->sess_tearing_down || se_cmd->cmd_wait_set) { 1370f4a9431SNicholas Bellinger pr_debug("Attempted to abort io tag: %llu already shutdown," 138febe562cSNicholas Bellinger " skipping\n", se_cmd->tag); 139febe562cSNicholas Bellinger spin_unlock(&se_cmd->t_state_lock); 140febe562cSNicholas Bellinger return false; 141febe562cSNicholas Bellinger } 142febe562cSNicholas Bellinger se_cmd->transport_state |= CMD_T_ABORTED; 1430f4a9431SNicholas Bellinger 1440f4a9431SNicholas Bellinger if ((tmr_sess != se_cmd->se_sess) && tas) 1450f4a9431SNicholas Bellinger se_cmd->transport_state |= CMD_T_TAS; 1460f4a9431SNicholas Bellinger 147febe562cSNicholas Bellinger spin_unlock(&se_cmd->t_state_lock); 148febe562cSNicholas Bellinger 149febe562cSNicholas Bellinger return kref_get_unless_zero(&se_cmd->cmd_kref); 150febe562cSNicholas Bellinger } 151febe562cSNicholas Bellinger 1523d28934aSNicholas Bellinger void core_tmr_abort_task( 1533d28934aSNicholas Bellinger struct se_device *dev, 1543d28934aSNicholas Bellinger struct se_tmr_req *tmr, 1553d28934aSNicholas Bellinger struct se_session *se_sess) 1563d28934aSNicholas Bellinger { 157f81ccb48SJoern Engel struct se_cmd *se_cmd; 1583d28934aSNicholas Bellinger unsigned long flags; 159649ee054SBart Van Assche u64 ref_tag; 1603d28934aSNicholas Bellinger 1613d28934aSNicholas Bellinger spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); 162f81ccb48SJoern Engel list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) { 1633d28934aSNicholas Bellinger 1643d28934aSNicholas Bellinger if (dev != se_cmd->se_dev) 1653d28934aSNicholas Bellinger continue; 16647b1584cSAlex Leung 167dc0fafdaSBart Van Assche /* skip task management functions, including tmr->task_cmd */ 168dc0fafdaSBart Van Assche if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 16947b1584cSAlex Leung continue; 17047b1584cSAlex Leung 171649ee054SBart Van Assche ref_tag = se_cmd->tag; 1723d28934aSNicholas Bellinger if (tmr->ref_task_tag != ref_tag) 1733d28934aSNicholas Bellinger continue; 1743d28934aSNicholas Bellinger 175649ee054SBart Van Assche printk("ABORT_TASK: Found referenced %s task_tag: %llu\n", 1763d28934aSNicholas Bellinger se_cmd->se_tfo->get_fabric_name(), ref_tag); 1773d28934aSNicholas Bellinger 1780f4a9431SNicholas Bellinger if (!__target_check_io_state(se_cmd, se_sess, 0)) { 1793d28934aSNicholas Bellinger spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 1809ff9d15eSBart Van Assche target_put_sess_cmd(se_cmd); 1813d28934aSNicholas Bellinger goto out; 1823d28934aSNicholas Bellinger } 1833d28934aSNicholas Bellinger list_del_init(&se_cmd->se_cmd_list); 1843d28934aSNicholas Bellinger spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 1853d28934aSNicholas Bellinger 1863d28934aSNicholas Bellinger cancel_work_sync(&se_cmd->work); 1873d28934aSNicholas Bellinger transport_wait_for_tasks(se_cmd); 1883d28934aSNicholas Bellinger 18968259b5aSAlex Leung transport_cmd_finish_abort(se_cmd, true); 190febe562cSNicholas Bellinger target_put_sess_cmd(se_cmd); 1913d28934aSNicholas Bellinger 1923d28934aSNicholas Bellinger printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for" 193649ee054SBart Van Assche " ref_tag: %llu\n", ref_tag); 1943d28934aSNicholas Bellinger tmr->response = TMR_FUNCTION_COMPLETE; 1953d28934aSNicholas Bellinger return; 1963d28934aSNicholas Bellinger } 1973d28934aSNicholas Bellinger spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 1983d28934aSNicholas Bellinger 1993d28934aSNicholas Bellinger out: 200649ee054SBart Van Assche printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n", 2013d28934aSNicholas Bellinger tmr->ref_task_tag); 2023d28934aSNicholas Bellinger tmr->response = TMR_TASK_DOES_NOT_EXIST; 2033d28934aSNicholas Bellinger } 2043d28934aSNicholas Bellinger 205d050ffb9SNicholas Bellinger static void core_tmr_drain_tmr_list( 206c66ac9dbSNicholas Bellinger struct se_device *dev, 207c66ac9dbSNicholas Bellinger struct se_tmr_req *tmr, 208d050ffb9SNicholas Bellinger struct list_head *preempt_and_abort_list) 209c66ac9dbSNicholas Bellinger { 210d050ffb9SNicholas Bellinger LIST_HEAD(drain_tmr_list); 211a6d9bb1cSNicholas Bellinger struct se_session *sess; 212c66ac9dbSNicholas Bellinger struct se_tmr_req *tmr_p, *tmr_pp; 213d050ffb9SNicholas Bellinger struct se_cmd *cmd; 214c66ac9dbSNicholas Bellinger unsigned long flags; 215a6d9bb1cSNicholas Bellinger bool rc; 216c66ac9dbSNicholas Bellinger /* 217c66ac9dbSNicholas Bellinger * Release all pending and outgoing TMRs aside from the received 218c66ac9dbSNicholas Bellinger * LUN_RESET tmr.. 219c66ac9dbSNicholas Bellinger */ 220d050ffb9SNicholas Bellinger spin_lock_irqsave(&dev->se_tmr_lock, flags); 221c66ac9dbSNicholas Bellinger list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { 222c66ac9dbSNicholas Bellinger /* 223c66ac9dbSNicholas Bellinger * Allow the received TMR to return with FUNCTION_COMPLETE. 224c66ac9dbSNicholas Bellinger */ 225abc1fd4fSJoern Engel if (tmr_p == tmr) 226c66ac9dbSNicholas Bellinger continue; 227c66ac9dbSNicholas Bellinger 228c66ac9dbSNicholas Bellinger cmd = tmr_p->task_cmd; 2296708bb27SAndy Grover if (!cmd) { 2306708bb27SAndy Grover pr_err("Unable to locate struct se_cmd for TMR\n"); 231c66ac9dbSNicholas Bellinger continue; 232c66ac9dbSNicholas Bellinger } 233c66ac9dbSNicholas Bellinger /* 234c66ac9dbSNicholas Bellinger * If this function was called with a valid pr_res_key 235c66ac9dbSNicholas Bellinger * parameter (eg: for PROUT PREEMPT_AND_ABORT service action 236ac75d8beSBart Van Assche * skip non registration key matching TMRs. 237c66ac9dbSNicholas Bellinger */ 238feae8564SJörn Engel if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) 239c66ac9dbSNicholas Bellinger continue; 240c66ac9dbSNicholas Bellinger 241a6d9bb1cSNicholas Bellinger sess = cmd->se_sess; 242a6d9bb1cSNicholas Bellinger if (WARN_ON_ONCE(!sess)) 243a6d9bb1cSNicholas Bellinger continue; 244a6d9bb1cSNicholas Bellinger 245a6d9bb1cSNicholas Bellinger spin_lock(&sess->sess_cmd_lock); 246d050ffb9SNicholas Bellinger spin_lock(&cmd->t_state_lock); 2470f4a9431SNicholas Bellinger if (!(cmd->transport_state & CMD_T_ACTIVE) || 2480f4a9431SNicholas Bellinger (cmd->transport_state & CMD_T_FABRIC_STOP)) { 249d050ffb9SNicholas Bellinger spin_unlock(&cmd->t_state_lock); 250a6d9bb1cSNicholas Bellinger spin_unlock(&sess->sess_cmd_lock); 251c66ac9dbSNicholas Bellinger continue; 252c66ac9dbSNicholas Bellinger } 253c66ac9dbSNicholas Bellinger if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { 254d050ffb9SNicholas Bellinger spin_unlock(&cmd->t_state_lock); 255a6d9bb1cSNicholas Bellinger spin_unlock(&sess->sess_cmd_lock); 256c66ac9dbSNicholas Bellinger continue; 257c66ac9dbSNicholas Bellinger } 2580f4a9431SNicholas Bellinger if (sess->sess_tearing_down || cmd->cmd_wait_set) { 2590f4a9431SNicholas Bellinger spin_unlock(&cmd->t_state_lock); 2600f4a9431SNicholas Bellinger spin_unlock(&sess->sess_cmd_lock); 2610f4a9431SNicholas Bellinger continue; 2620f4a9431SNicholas Bellinger } 263a6d9bb1cSNicholas Bellinger cmd->transport_state |= CMD_T_ABORTED; 264d050ffb9SNicholas Bellinger spin_unlock(&cmd->t_state_lock); 265d050ffb9SNicholas Bellinger 266a6d9bb1cSNicholas Bellinger rc = kref_get_unless_zero(&cmd->cmd_kref); 267a6d9bb1cSNicholas Bellinger if (!rc) { 268a6d9bb1cSNicholas Bellinger printk("LUN_RESET TMR: non-zero kref_get_unless_zero\n"); 2690f4a9431SNicholas Bellinger spin_unlock(&sess->sess_cmd_lock); 270a6d9bb1cSNicholas Bellinger continue; 271a6d9bb1cSNicholas Bellinger } 2720f4a9431SNicholas Bellinger spin_unlock(&sess->sess_cmd_lock); 2730f4a9431SNicholas Bellinger 2746eb40b2aSJoern Engel list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); 275d050ffb9SNicholas Bellinger } 276d050ffb9SNicholas Bellinger spin_unlock_irqrestore(&dev->se_tmr_lock, flags); 277d050ffb9SNicholas Bellinger 278abc1fd4fSJoern Engel list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) { 279b8a11d73SJoern Engel list_del_init(&tmr_p->tmr_list); 280abc1fd4fSJoern Engel cmd = tmr_p->task_cmd; 281d050ffb9SNicholas Bellinger 2826708bb27SAndy Grover pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x," 283c66ac9dbSNicholas Bellinger " Response: 0x%02x, t_state: %d\n", 284abc1fd4fSJoern Engel (preempt_and_abort_list) ? "Preempt" : "", tmr_p, 285abc1fd4fSJoern Engel tmr_p->function, tmr_p->response, cmd->t_state); 286c66ac9dbSNicholas Bellinger 287a6d9bb1cSNicholas Bellinger cancel_work_sync(&cmd->work); 288a6d9bb1cSNicholas Bellinger transport_wait_for_tasks(cmd); 289a6d9bb1cSNicholas Bellinger 2908dc52b54SNicholas Bellinger transport_cmd_finish_abort(cmd, 1); 291a6d9bb1cSNicholas Bellinger target_put_sess_cmd(cmd); 292c66ac9dbSNicholas Bellinger } 293d050ffb9SNicholas Bellinger } 294d050ffb9SNicholas Bellinger 295cf572a96SChristoph Hellwig static void core_tmr_drain_state_list( 296d050ffb9SNicholas Bellinger struct se_device *dev, 297d050ffb9SNicholas Bellinger struct se_cmd *prout_cmd, 298ebde1ca5SNicholas Bellinger struct se_session *tmr_sess, 299d050ffb9SNicholas Bellinger int tas, 300d050ffb9SNicholas Bellinger struct list_head *preempt_and_abort_list) 301d050ffb9SNicholas Bellinger { 302d050ffb9SNicholas Bellinger LIST_HEAD(drain_task_list); 303febe562cSNicholas Bellinger struct se_session *sess; 304cf572a96SChristoph Hellwig struct se_cmd *cmd, *next; 305d050ffb9SNicholas Bellinger unsigned long flags; 306febe562cSNicholas Bellinger int rc; 307cf572a96SChristoph Hellwig 308c66ac9dbSNicholas Bellinger /* 309cf572a96SChristoph Hellwig * Complete outstanding commands with TASK_ABORTED SAM status. 310cf572a96SChristoph Hellwig * 311c66ac9dbSNicholas Bellinger * This is following sam4r17, section 5.6 Aborting commands, Table 38 312c66ac9dbSNicholas Bellinger * for TMR LUN_RESET: 313c66ac9dbSNicholas Bellinger * 314c66ac9dbSNicholas Bellinger * a) "Yes" indicates that each command that is aborted on an I_T nexus 315c66ac9dbSNicholas Bellinger * other than the one that caused the SCSI device condition is 316c66ac9dbSNicholas Bellinger * completed with TASK ABORTED status, if the TAS bit is set to one in 317c66ac9dbSNicholas Bellinger * the Control mode page (see SPC-4). "No" indicates that no status is 318c66ac9dbSNicholas Bellinger * returned for aborted commands. 319c66ac9dbSNicholas Bellinger * 320c66ac9dbSNicholas Bellinger * d) If the logical unit reset is caused by a particular I_T nexus 321c66ac9dbSNicholas Bellinger * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" 322c66ac9dbSNicholas Bellinger * (TASK_ABORTED status) applies. 323c66ac9dbSNicholas Bellinger * 324c66ac9dbSNicholas Bellinger * Otherwise (e.g., if triggered by a hard reset), "no" 325c66ac9dbSNicholas Bellinger * (no TASK_ABORTED SAM status) applies. 326c66ac9dbSNicholas Bellinger * 327c66ac9dbSNicholas Bellinger * Note that this seems to be independent of TAS (Task Aborted Status) 328c66ac9dbSNicholas Bellinger * in the Control Mode Page. 329c66ac9dbSNicholas Bellinger */ 330c66ac9dbSNicholas Bellinger spin_lock_irqsave(&dev->execute_task_lock, flags); 331cf572a96SChristoph Hellwig list_for_each_entry_safe(cmd, next, &dev->state_list, state_list) { 332c66ac9dbSNicholas Bellinger /* 333c66ac9dbSNicholas Bellinger * For PREEMPT_AND_ABORT usage, only process commands 334c66ac9dbSNicholas Bellinger * with a matching reservation key. 335c66ac9dbSNicholas Bellinger */ 336feae8564SJörn Engel if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) 337c66ac9dbSNicholas Bellinger continue; 338cf572a96SChristoph Hellwig 339c66ac9dbSNicholas Bellinger /* 340c66ac9dbSNicholas Bellinger * Not aborting PROUT PREEMPT_AND_ABORT CDB.. 341c66ac9dbSNicholas Bellinger */ 342c66ac9dbSNicholas Bellinger if (prout_cmd == cmd) 343c66ac9dbSNicholas Bellinger continue; 344c66ac9dbSNicholas Bellinger 345febe562cSNicholas Bellinger sess = cmd->se_sess; 346febe562cSNicholas Bellinger if (WARN_ON_ONCE(!sess)) 347febe562cSNicholas Bellinger continue; 348febe562cSNicholas Bellinger 349febe562cSNicholas Bellinger spin_lock(&sess->sess_cmd_lock); 3500f4a9431SNicholas Bellinger rc = __target_check_io_state(cmd, tmr_sess, tas); 351febe562cSNicholas Bellinger spin_unlock(&sess->sess_cmd_lock); 352febe562cSNicholas Bellinger if (!rc) 353febe562cSNicholas Bellinger continue; 354febe562cSNicholas Bellinger 355cf572a96SChristoph Hellwig list_move_tail(&cmd->state_list, &drain_task_list); 356cf572a96SChristoph Hellwig cmd->state_active = false; 357d050ffb9SNicholas Bellinger } 358c66ac9dbSNicholas Bellinger spin_unlock_irqrestore(&dev->execute_task_lock, flags); 359c66ac9dbSNicholas Bellinger 360d050ffb9SNicholas Bellinger while (!list_empty(&drain_task_list)) { 361cf572a96SChristoph Hellwig cmd = list_entry(drain_task_list.next, struct se_cmd, state_list); 362febe562cSNicholas Bellinger list_del_init(&cmd->state_list); 363d050ffb9SNicholas Bellinger 364cf572a96SChristoph Hellwig pr_debug("LUN_RESET: %s cmd: %p" 365649ee054SBart Van Assche " ITT/CmdSN: 0x%08llx/0x%08x, i_state: %d, t_state: %d" 366f2da9dbdSChristoph Hellwig "cdb: 0x%02x\n", 367cf572a96SChristoph Hellwig (preempt_and_abort_list) ? "Preempt" : "", cmd, 368649ee054SBart Van Assche cmd->tag, 0, 369e3d6f909SAndy Grover cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, 370f2da9dbdSChristoph Hellwig cmd->t_task_cdb[0]); 371649ee054SBart Van Assche pr_debug("LUN_RESET: ITT[0x%08llx] - pr_res_key: 0x%016Lx" 372785fdf70SChristoph Hellwig " -- CMD_T_ACTIVE: %d" 3737d680f3bSChristoph Hellwig " CMD_T_STOP: %d CMD_T_SENT: %d\n", 374649ee054SBart Van Assche cmd->tag, cmd->pr_res_key, 3757d680f3bSChristoph Hellwig (cmd->transport_state & CMD_T_ACTIVE) != 0, 3767d680f3bSChristoph Hellwig (cmd->transport_state & CMD_T_STOP) != 0, 3777d680f3bSChristoph Hellwig (cmd->transport_state & CMD_T_SENT) != 0); 378c66ac9dbSNicholas Bellinger 37935e0e757SChristoph Hellwig /* 38035e0e757SChristoph Hellwig * If the command may be queued onto a workqueue cancel it now. 38135e0e757SChristoph Hellwig * 38235e0e757SChristoph Hellwig * This is equivalent to removal from the execute queue in the 38335e0e757SChristoph Hellwig * loop above, but we do it down here given that 38435e0e757SChristoph Hellwig * cancel_work_sync may block. 38535e0e757SChristoph Hellwig */ 38635e0e757SChristoph Hellwig cancel_work_sync(&cmd->work); 387febe562cSNicholas Bellinger transport_wait_for_tasks(cmd); 388c66ac9dbSNicholas Bellinger 3890f4a9431SNicholas Bellinger core_tmr_handle_tas_abort(cmd, tas); 390febe562cSNicholas Bellinger target_put_sess_cmd(cmd); 391c66ac9dbSNicholas Bellinger } 392d050ffb9SNicholas Bellinger } 393d050ffb9SNicholas Bellinger 394d050ffb9SNicholas Bellinger int core_tmr_lun_reset( 395d050ffb9SNicholas Bellinger struct se_device *dev, 396d050ffb9SNicholas Bellinger struct se_tmr_req *tmr, 397d050ffb9SNicholas Bellinger struct list_head *preempt_and_abort_list, 398d050ffb9SNicholas Bellinger struct se_cmd *prout_cmd) 399d050ffb9SNicholas Bellinger { 400d050ffb9SNicholas Bellinger struct se_node_acl *tmr_nacl = NULL; 401d050ffb9SNicholas Bellinger struct se_portal_group *tmr_tpg = NULL; 402ebde1ca5SNicholas Bellinger struct se_session *tmr_sess = NULL; 403d050ffb9SNicholas Bellinger int tas; 404d050ffb9SNicholas Bellinger /* 405d050ffb9SNicholas Bellinger * TASK_ABORTED status bit, this is configurable via ConfigFS 406d050ffb9SNicholas Bellinger * struct se_device attributes. spc4r17 section 7.4.6 Control mode page 407d050ffb9SNicholas Bellinger * 408d050ffb9SNicholas Bellinger * A task aborted status (TAS) bit set to zero specifies that aborted 409d050ffb9SNicholas Bellinger * tasks shall be terminated by the device server without any response 410d050ffb9SNicholas Bellinger * to the application client. A TAS bit set to one specifies that tasks 411d050ffb9SNicholas Bellinger * aborted by the actions of an I_T nexus other than the I_T nexus on 412d050ffb9SNicholas Bellinger * which the command was received shall be completed with TASK ABORTED 413d050ffb9SNicholas Bellinger * status (see SAM-4). 414d050ffb9SNicholas Bellinger */ 4150fd97ccfSChristoph Hellwig tas = dev->dev_attrib.emulate_tas; 416d050ffb9SNicholas Bellinger /* 417d050ffb9SNicholas Bellinger * Determine if this se_tmr is coming from a $FABRIC_MOD 418d050ffb9SNicholas Bellinger * or struct se_device passthrough.. 419d050ffb9SNicholas Bellinger */ 420d050ffb9SNicholas Bellinger if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { 421ebde1ca5SNicholas Bellinger tmr_sess = tmr->task_cmd->se_sess; 422ebde1ca5SNicholas Bellinger tmr_nacl = tmr_sess->se_node_acl; 423ebde1ca5SNicholas Bellinger tmr_tpg = tmr_sess->se_tpg; 424d050ffb9SNicholas Bellinger if (tmr_nacl && tmr_tpg) { 425d050ffb9SNicholas Bellinger pr_debug("LUN_RESET: TMR caller fabric: %s" 426d050ffb9SNicholas Bellinger " initiator port %s\n", 427d050ffb9SNicholas Bellinger tmr_tpg->se_tpg_tfo->get_fabric_name(), 428d050ffb9SNicholas Bellinger tmr_nacl->initiatorname); 429d050ffb9SNicholas Bellinger } 430d050ffb9SNicholas Bellinger } 431d050ffb9SNicholas Bellinger pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", 432d050ffb9SNicholas Bellinger (preempt_and_abort_list) ? "Preempt" : "TMR", 433d050ffb9SNicholas Bellinger dev->transport->name, tas); 434d050ffb9SNicholas Bellinger 435d050ffb9SNicholas Bellinger core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); 436ebde1ca5SNicholas Bellinger core_tmr_drain_state_list(dev, prout_cmd, tmr_sess, tas, 437d050ffb9SNicholas Bellinger preempt_and_abort_list); 438af877292SChristoph Hellwig 439c66ac9dbSNicholas Bellinger /* 440c66ac9dbSNicholas Bellinger * Clear any legacy SPC-2 reservation when called during 441c66ac9dbSNicholas Bellinger * LOGICAL UNIT RESET 442c66ac9dbSNicholas Bellinger */ 4436708bb27SAndy Grover if (!preempt_and_abort_list && 4440fd97ccfSChristoph Hellwig (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) { 445c66ac9dbSNicholas Bellinger spin_lock(&dev->dev_reservation_lock); 446c66ac9dbSNicholas Bellinger dev->dev_reserved_node_acl = NULL; 4470fd97ccfSChristoph Hellwig dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 448c66ac9dbSNicholas Bellinger spin_unlock(&dev->dev_reservation_lock); 4496708bb27SAndy Grover pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); 450c66ac9dbSNicholas Bellinger } 451c66ac9dbSNicholas Bellinger 452ee480683SNicholas Bellinger atomic_long_inc(&dev->num_resets); 453c66ac9dbSNicholas Bellinger 4546708bb27SAndy Grover pr_debug("LUN_RESET: %s for [%s] Complete\n", 455c66ac9dbSNicholas Bellinger (preempt_and_abort_list) ? "Preempt" : "TMR", 456e3d6f909SAndy Grover dev->transport->name); 457c66ac9dbSNicholas Bellinger return 0; 458c66ac9dbSNicholas Bellinger } 459d050ffb9SNicholas Bellinger 460