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 78c66ac9dbSNicholas Bellinger static void core_tmr_handle_tas_abort( 79c66ac9dbSNicholas Bellinger struct se_node_acl *tmr_nacl, 80c66ac9dbSNicholas Bellinger struct se_cmd *cmd, 81c1c35d52SNicholas Bellinger int tas) 82c66ac9dbSNicholas Bellinger { 8368259b5aSAlex Leung bool remove = true; 84c66ac9dbSNicholas Bellinger /* 85c66ac9dbSNicholas Bellinger * TASK ABORTED status (TAS) bit support 86c66ac9dbSNicholas Bellinger */ 878f832690SJoern Engel if ((tmr_nacl && (tmr_nacl != cmd->se_sess->se_node_acl)) && tas) { 8868259b5aSAlex Leung remove = false; 89c66ac9dbSNicholas Bellinger transport_send_task_abort(cmd); 9068259b5aSAlex Leung } 91c66ac9dbSNicholas Bellinger 9268259b5aSAlex Leung transport_cmd_finish_abort(cmd, remove); 93c66ac9dbSNicholas Bellinger } 94c66ac9dbSNicholas Bellinger 95feae8564SJörn Engel static int target_check_cdb_and_preempt(struct list_head *list, 96c165f69cSJörn Engel struct se_cmd *cmd) 97c165f69cSJörn Engel { 98feae8564SJörn Engel struct t10_pr_registration *reg; 99c165f69cSJörn Engel 100feae8564SJörn Engel if (!list) 101feae8564SJörn Engel return 0; 102feae8564SJörn Engel list_for_each_entry(reg, list, pr_reg_abort_list) { 103feae8564SJörn Engel if (reg->pr_res_key == cmd->pr_res_key) 104c165f69cSJörn Engel return 0; 105c165f69cSJörn Engel } 106c165f69cSJörn Engel 107c165f69cSJörn Engel return 1; 108c165f69cSJörn Engel } 109c165f69cSJörn Engel 110febe562cSNicholas Bellinger static bool __target_check_io_state(struct se_cmd *se_cmd) 111febe562cSNicholas Bellinger { 112febe562cSNicholas Bellinger struct se_session *sess = se_cmd->se_sess; 113febe562cSNicholas Bellinger 114febe562cSNicholas Bellinger assert_spin_locked(&sess->sess_cmd_lock); 115febe562cSNicholas Bellinger WARN_ON_ONCE(!irqs_disabled()); 116febe562cSNicholas Bellinger /* 117febe562cSNicholas Bellinger * If command already reached CMD_T_COMPLETE state within 118febe562cSNicholas Bellinger * target_complete_cmd(), this se_cmd has been passed to 119febe562cSNicholas Bellinger * fabric driver and will not be aborted. 120febe562cSNicholas Bellinger * 121febe562cSNicholas Bellinger * Otherwise, obtain a local se_cmd->cmd_kref now for TMR 122febe562cSNicholas Bellinger * ABORT_TASK + LUN_RESET for CMD_T_ABORTED processing as 123febe562cSNicholas Bellinger * long as se_cmd->cmd_kref is still active unless zero. 124febe562cSNicholas Bellinger */ 125febe562cSNicholas Bellinger spin_lock(&se_cmd->t_state_lock); 126febe562cSNicholas Bellinger if (se_cmd->transport_state & CMD_T_COMPLETE) { 127febe562cSNicholas Bellinger pr_debug("Attempted to abort io tag: %llu already complete," 128febe562cSNicholas Bellinger " skipping\n", se_cmd->tag); 129febe562cSNicholas Bellinger spin_unlock(&se_cmd->t_state_lock); 130febe562cSNicholas Bellinger return false; 131febe562cSNicholas Bellinger } 132febe562cSNicholas Bellinger se_cmd->transport_state |= CMD_T_ABORTED; 133febe562cSNicholas Bellinger spin_unlock(&se_cmd->t_state_lock); 134febe562cSNicholas Bellinger 135febe562cSNicholas Bellinger return kref_get_unless_zero(&se_cmd->cmd_kref); 136febe562cSNicholas Bellinger } 137febe562cSNicholas Bellinger 1383d28934aSNicholas Bellinger void core_tmr_abort_task( 1393d28934aSNicholas Bellinger struct se_device *dev, 1403d28934aSNicholas Bellinger struct se_tmr_req *tmr, 1413d28934aSNicholas Bellinger struct se_session *se_sess) 1423d28934aSNicholas Bellinger { 143f81ccb48SJoern Engel struct se_cmd *se_cmd; 1443d28934aSNicholas Bellinger unsigned long flags; 145649ee054SBart Van Assche u64 ref_tag; 1463d28934aSNicholas Bellinger 1473d28934aSNicholas Bellinger spin_lock_irqsave(&se_sess->sess_cmd_lock, flags); 148f81ccb48SJoern Engel list_for_each_entry(se_cmd, &se_sess->sess_cmd_list, se_cmd_list) { 1493d28934aSNicholas Bellinger 1503d28934aSNicholas Bellinger if (dev != se_cmd->se_dev) 1513d28934aSNicholas Bellinger continue; 15247b1584cSAlex Leung 153dc0fafdaSBart Van Assche /* skip task management functions, including tmr->task_cmd */ 154dc0fafdaSBart Van Assche if (se_cmd->se_cmd_flags & SCF_SCSI_TMR_CDB) 15547b1584cSAlex Leung continue; 15647b1584cSAlex Leung 157649ee054SBart Van Assche ref_tag = se_cmd->tag; 1583d28934aSNicholas Bellinger if (tmr->ref_task_tag != ref_tag) 1593d28934aSNicholas Bellinger continue; 1603d28934aSNicholas Bellinger 161649ee054SBart Van Assche printk("ABORT_TASK: Found referenced %s task_tag: %llu\n", 1623d28934aSNicholas Bellinger se_cmd->se_tfo->get_fabric_name(), ref_tag); 1633d28934aSNicholas Bellinger 164febe562cSNicholas Bellinger if (!__target_check_io_state(se_cmd)) { 1653d28934aSNicholas Bellinger spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 1669ff9d15eSBart Van Assche target_put_sess_cmd(se_cmd); 1673d28934aSNicholas Bellinger goto out; 1683d28934aSNicholas Bellinger } 1693d28934aSNicholas Bellinger list_del_init(&se_cmd->se_cmd_list); 1703d28934aSNicholas Bellinger spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 1713d28934aSNicholas Bellinger 1723d28934aSNicholas Bellinger cancel_work_sync(&se_cmd->work); 1733d28934aSNicholas Bellinger transport_wait_for_tasks(se_cmd); 1743d28934aSNicholas Bellinger 17568259b5aSAlex Leung transport_cmd_finish_abort(se_cmd, true); 176febe562cSNicholas Bellinger target_put_sess_cmd(se_cmd); 1773d28934aSNicholas Bellinger 1783d28934aSNicholas Bellinger printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for" 179649ee054SBart Van Assche " ref_tag: %llu\n", ref_tag); 1803d28934aSNicholas Bellinger tmr->response = TMR_FUNCTION_COMPLETE; 1813d28934aSNicholas Bellinger return; 1823d28934aSNicholas Bellinger } 1833d28934aSNicholas Bellinger spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags); 1843d28934aSNicholas Bellinger 1853d28934aSNicholas Bellinger out: 186649ee054SBart Van Assche printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %lld\n", 1873d28934aSNicholas Bellinger tmr->ref_task_tag); 1883d28934aSNicholas Bellinger tmr->response = TMR_TASK_DOES_NOT_EXIST; 1893d28934aSNicholas Bellinger } 1903d28934aSNicholas Bellinger 191d050ffb9SNicholas Bellinger static void core_tmr_drain_tmr_list( 192c66ac9dbSNicholas Bellinger struct se_device *dev, 193c66ac9dbSNicholas Bellinger struct se_tmr_req *tmr, 194d050ffb9SNicholas Bellinger struct list_head *preempt_and_abort_list) 195c66ac9dbSNicholas Bellinger { 196d050ffb9SNicholas Bellinger LIST_HEAD(drain_tmr_list); 197a6d9bb1cSNicholas Bellinger struct se_session *sess; 198c66ac9dbSNicholas Bellinger struct se_tmr_req *tmr_p, *tmr_pp; 199d050ffb9SNicholas Bellinger struct se_cmd *cmd; 200c66ac9dbSNicholas Bellinger unsigned long flags; 201a6d9bb1cSNicholas Bellinger bool rc; 202c66ac9dbSNicholas Bellinger /* 203c66ac9dbSNicholas Bellinger * Release all pending and outgoing TMRs aside from the received 204c66ac9dbSNicholas Bellinger * LUN_RESET tmr.. 205c66ac9dbSNicholas Bellinger */ 206d050ffb9SNicholas Bellinger spin_lock_irqsave(&dev->se_tmr_lock, flags); 207c66ac9dbSNicholas Bellinger list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) { 208c66ac9dbSNicholas Bellinger /* 209c66ac9dbSNicholas Bellinger * Allow the received TMR to return with FUNCTION_COMPLETE. 210c66ac9dbSNicholas Bellinger */ 211abc1fd4fSJoern Engel if (tmr_p == tmr) 212c66ac9dbSNicholas Bellinger continue; 213c66ac9dbSNicholas Bellinger 214c66ac9dbSNicholas Bellinger cmd = tmr_p->task_cmd; 2156708bb27SAndy Grover if (!cmd) { 2166708bb27SAndy Grover pr_err("Unable to locate struct se_cmd for TMR\n"); 217c66ac9dbSNicholas Bellinger continue; 218c66ac9dbSNicholas Bellinger } 219c66ac9dbSNicholas Bellinger /* 220c66ac9dbSNicholas Bellinger * If this function was called with a valid pr_res_key 221c66ac9dbSNicholas Bellinger * parameter (eg: for PROUT PREEMPT_AND_ABORT service action 222ac75d8beSBart Van Assche * skip non registration key matching TMRs. 223c66ac9dbSNicholas Bellinger */ 224feae8564SJörn Engel if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) 225c66ac9dbSNicholas Bellinger continue; 226c66ac9dbSNicholas Bellinger 227a6d9bb1cSNicholas Bellinger sess = cmd->se_sess; 228a6d9bb1cSNicholas Bellinger if (WARN_ON_ONCE(!sess)) 229a6d9bb1cSNicholas Bellinger continue; 230a6d9bb1cSNicholas Bellinger 231a6d9bb1cSNicholas Bellinger spin_lock(&sess->sess_cmd_lock); 232d050ffb9SNicholas Bellinger spin_lock(&cmd->t_state_lock); 2337d680f3bSChristoph Hellwig if (!(cmd->transport_state & CMD_T_ACTIVE)) { 234d050ffb9SNicholas Bellinger spin_unlock(&cmd->t_state_lock); 235a6d9bb1cSNicholas Bellinger spin_unlock(&sess->sess_cmd_lock); 236c66ac9dbSNicholas Bellinger continue; 237c66ac9dbSNicholas Bellinger } 238c66ac9dbSNicholas Bellinger if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) { 239d050ffb9SNicholas Bellinger spin_unlock(&cmd->t_state_lock); 240a6d9bb1cSNicholas Bellinger spin_unlock(&sess->sess_cmd_lock); 241c66ac9dbSNicholas Bellinger continue; 242c66ac9dbSNicholas Bellinger } 243a6d9bb1cSNicholas Bellinger cmd->transport_state |= CMD_T_ABORTED; 244d050ffb9SNicholas Bellinger spin_unlock(&cmd->t_state_lock); 245d050ffb9SNicholas Bellinger 246a6d9bb1cSNicholas Bellinger rc = kref_get_unless_zero(&cmd->cmd_kref); 247a6d9bb1cSNicholas Bellinger spin_unlock(&sess->sess_cmd_lock); 248a6d9bb1cSNicholas Bellinger if (!rc) { 249a6d9bb1cSNicholas Bellinger printk("LUN_RESET TMR: non-zero kref_get_unless_zero\n"); 250a6d9bb1cSNicholas Bellinger continue; 251a6d9bb1cSNicholas Bellinger } 2526eb40b2aSJoern Engel list_move_tail(&tmr_p->tmr_list, &drain_tmr_list); 253d050ffb9SNicholas Bellinger } 254d050ffb9SNicholas Bellinger spin_unlock_irqrestore(&dev->se_tmr_lock, flags); 255d050ffb9SNicholas Bellinger 256abc1fd4fSJoern Engel list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) { 257b8a11d73SJoern Engel list_del_init(&tmr_p->tmr_list); 258abc1fd4fSJoern Engel cmd = tmr_p->task_cmd; 259d050ffb9SNicholas Bellinger 2606708bb27SAndy Grover pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x," 261c66ac9dbSNicholas Bellinger " Response: 0x%02x, t_state: %d\n", 262abc1fd4fSJoern Engel (preempt_and_abort_list) ? "Preempt" : "", tmr_p, 263abc1fd4fSJoern Engel tmr_p->function, tmr_p->response, cmd->t_state); 264c66ac9dbSNicholas Bellinger 265a6d9bb1cSNicholas Bellinger cancel_work_sync(&cmd->work); 266a6d9bb1cSNicholas Bellinger transport_wait_for_tasks(cmd); 267a6d9bb1cSNicholas Bellinger 2688dc52b54SNicholas Bellinger transport_cmd_finish_abort(cmd, 1); 269a6d9bb1cSNicholas Bellinger target_put_sess_cmd(cmd); 270c66ac9dbSNicholas Bellinger } 271d050ffb9SNicholas Bellinger } 272d050ffb9SNicholas Bellinger 273cf572a96SChristoph Hellwig static void core_tmr_drain_state_list( 274d050ffb9SNicholas Bellinger struct se_device *dev, 275d050ffb9SNicholas Bellinger struct se_cmd *prout_cmd, 276d050ffb9SNicholas Bellinger struct se_node_acl *tmr_nacl, 277d050ffb9SNicholas Bellinger int tas, 278d050ffb9SNicholas Bellinger struct list_head *preempt_and_abort_list) 279d050ffb9SNicholas Bellinger { 280d050ffb9SNicholas Bellinger LIST_HEAD(drain_task_list); 281febe562cSNicholas Bellinger struct se_session *sess; 282cf572a96SChristoph Hellwig struct se_cmd *cmd, *next; 283d050ffb9SNicholas Bellinger unsigned long flags; 284febe562cSNicholas Bellinger int rc; 285cf572a96SChristoph Hellwig 286c66ac9dbSNicholas Bellinger /* 287cf572a96SChristoph Hellwig * Complete outstanding commands with TASK_ABORTED SAM status. 288cf572a96SChristoph Hellwig * 289c66ac9dbSNicholas Bellinger * This is following sam4r17, section 5.6 Aborting commands, Table 38 290c66ac9dbSNicholas Bellinger * for TMR LUN_RESET: 291c66ac9dbSNicholas Bellinger * 292c66ac9dbSNicholas Bellinger * a) "Yes" indicates that each command that is aborted on an I_T nexus 293c66ac9dbSNicholas Bellinger * other than the one that caused the SCSI device condition is 294c66ac9dbSNicholas Bellinger * completed with TASK ABORTED status, if the TAS bit is set to one in 295c66ac9dbSNicholas Bellinger * the Control mode page (see SPC-4). "No" indicates that no status is 296c66ac9dbSNicholas Bellinger * returned for aborted commands. 297c66ac9dbSNicholas Bellinger * 298c66ac9dbSNicholas Bellinger * d) If the logical unit reset is caused by a particular I_T nexus 299c66ac9dbSNicholas Bellinger * (e.g., by a LOGICAL UNIT RESET task management function), then "yes" 300c66ac9dbSNicholas Bellinger * (TASK_ABORTED status) applies. 301c66ac9dbSNicholas Bellinger * 302c66ac9dbSNicholas Bellinger * Otherwise (e.g., if triggered by a hard reset), "no" 303c66ac9dbSNicholas Bellinger * (no TASK_ABORTED SAM status) applies. 304c66ac9dbSNicholas Bellinger * 305c66ac9dbSNicholas Bellinger * Note that this seems to be independent of TAS (Task Aborted Status) 306c66ac9dbSNicholas Bellinger * in the Control Mode Page. 307c66ac9dbSNicholas Bellinger */ 308c66ac9dbSNicholas Bellinger spin_lock_irqsave(&dev->execute_task_lock, flags); 309cf572a96SChristoph Hellwig list_for_each_entry_safe(cmd, next, &dev->state_list, state_list) { 310c66ac9dbSNicholas Bellinger /* 311c66ac9dbSNicholas Bellinger * For PREEMPT_AND_ABORT usage, only process commands 312c66ac9dbSNicholas Bellinger * with a matching reservation key. 313c66ac9dbSNicholas Bellinger */ 314feae8564SJörn Engel if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd)) 315c66ac9dbSNicholas Bellinger continue; 316cf572a96SChristoph Hellwig 317c66ac9dbSNicholas Bellinger /* 318c66ac9dbSNicholas Bellinger * Not aborting PROUT PREEMPT_AND_ABORT CDB.. 319c66ac9dbSNicholas Bellinger */ 320c66ac9dbSNicholas Bellinger if (prout_cmd == cmd) 321c66ac9dbSNicholas Bellinger continue; 322c66ac9dbSNicholas Bellinger 323febe562cSNicholas Bellinger sess = cmd->se_sess; 324febe562cSNicholas Bellinger if (WARN_ON_ONCE(!sess)) 325febe562cSNicholas Bellinger continue; 326febe562cSNicholas Bellinger 327febe562cSNicholas Bellinger spin_lock(&sess->sess_cmd_lock); 328febe562cSNicholas Bellinger rc = __target_check_io_state(cmd); 329febe562cSNicholas Bellinger spin_unlock(&sess->sess_cmd_lock); 330febe562cSNicholas Bellinger if (!rc) 331febe562cSNicholas Bellinger continue; 332febe562cSNicholas Bellinger 333cf572a96SChristoph Hellwig list_move_tail(&cmd->state_list, &drain_task_list); 334cf572a96SChristoph Hellwig cmd->state_active = false; 335d050ffb9SNicholas Bellinger } 336c66ac9dbSNicholas Bellinger spin_unlock_irqrestore(&dev->execute_task_lock, flags); 337c66ac9dbSNicholas Bellinger 338d050ffb9SNicholas Bellinger while (!list_empty(&drain_task_list)) { 339cf572a96SChristoph Hellwig cmd = list_entry(drain_task_list.next, struct se_cmd, state_list); 340febe562cSNicholas Bellinger list_del_init(&cmd->state_list); 341d050ffb9SNicholas Bellinger 342cf572a96SChristoph Hellwig pr_debug("LUN_RESET: %s cmd: %p" 343649ee054SBart Van Assche " ITT/CmdSN: 0x%08llx/0x%08x, i_state: %d, t_state: %d" 344f2da9dbdSChristoph Hellwig "cdb: 0x%02x\n", 345cf572a96SChristoph Hellwig (preempt_and_abort_list) ? "Preempt" : "", cmd, 346649ee054SBart Van Assche cmd->tag, 0, 347e3d6f909SAndy Grover cmd->se_tfo->get_cmd_state(cmd), cmd->t_state, 348f2da9dbdSChristoph Hellwig cmd->t_task_cdb[0]); 349649ee054SBart Van Assche pr_debug("LUN_RESET: ITT[0x%08llx] - pr_res_key: 0x%016Lx" 350785fdf70SChristoph Hellwig " -- CMD_T_ACTIVE: %d" 3517d680f3bSChristoph Hellwig " CMD_T_STOP: %d CMD_T_SENT: %d\n", 352649ee054SBart Van Assche cmd->tag, cmd->pr_res_key, 3537d680f3bSChristoph Hellwig (cmd->transport_state & CMD_T_ACTIVE) != 0, 3547d680f3bSChristoph Hellwig (cmd->transport_state & CMD_T_STOP) != 0, 3557d680f3bSChristoph Hellwig (cmd->transport_state & CMD_T_SENT) != 0); 356c66ac9dbSNicholas Bellinger 35735e0e757SChristoph Hellwig /* 35835e0e757SChristoph Hellwig * If the command may be queued onto a workqueue cancel it now. 35935e0e757SChristoph Hellwig * 36035e0e757SChristoph Hellwig * This is equivalent to removal from the execute queue in the 36135e0e757SChristoph Hellwig * loop above, but we do it down here given that 36235e0e757SChristoph Hellwig * cancel_work_sync may block. 36335e0e757SChristoph Hellwig */ 36435e0e757SChristoph Hellwig cancel_work_sync(&cmd->work); 365febe562cSNicholas Bellinger transport_wait_for_tasks(cmd); 366c66ac9dbSNicholas Bellinger 367c1c35d52SNicholas Bellinger core_tmr_handle_tas_abort(tmr_nacl, cmd, tas); 368febe562cSNicholas Bellinger target_put_sess_cmd(cmd); 369c66ac9dbSNicholas Bellinger } 370d050ffb9SNicholas Bellinger } 371d050ffb9SNicholas Bellinger 372d050ffb9SNicholas Bellinger int core_tmr_lun_reset( 373d050ffb9SNicholas Bellinger struct se_device *dev, 374d050ffb9SNicholas Bellinger struct se_tmr_req *tmr, 375d050ffb9SNicholas Bellinger struct list_head *preempt_and_abort_list, 376d050ffb9SNicholas Bellinger struct se_cmd *prout_cmd) 377d050ffb9SNicholas Bellinger { 378d050ffb9SNicholas Bellinger struct se_node_acl *tmr_nacl = NULL; 379d050ffb9SNicholas Bellinger struct se_portal_group *tmr_tpg = NULL; 380d050ffb9SNicholas Bellinger int tas; 381d050ffb9SNicholas Bellinger /* 382d050ffb9SNicholas Bellinger * TASK_ABORTED status bit, this is configurable via ConfigFS 383d050ffb9SNicholas Bellinger * struct se_device attributes. spc4r17 section 7.4.6 Control mode page 384d050ffb9SNicholas Bellinger * 385d050ffb9SNicholas Bellinger * A task aborted status (TAS) bit set to zero specifies that aborted 386d050ffb9SNicholas Bellinger * tasks shall be terminated by the device server without any response 387d050ffb9SNicholas Bellinger * to the application client. A TAS bit set to one specifies that tasks 388d050ffb9SNicholas Bellinger * aborted by the actions of an I_T nexus other than the I_T nexus on 389d050ffb9SNicholas Bellinger * which the command was received shall be completed with TASK ABORTED 390d050ffb9SNicholas Bellinger * status (see SAM-4). 391d050ffb9SNicholas Bellinger */ 3920fd97ccfSChristoph Hellwig tas = dev->dev_attrib.emulate_tas; 393d050ffb9SNicholas Bellinger /* 394d050ffb9SNicholas Bellinger * Determine if this se_tmr is coming from a $FABRIC_MOD 395d050ffb9SNicholas Bellinger * or struct se_device passthrough.. 396d050ffb9SNicholas Bellinger */ 397d050ffb9SNicholas Bellinger if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) { 398d050ffb9SNicholas Bellinger tmr_nacl = tmr->task_cmd->se_sess->se_node_acl; 399d050ffb9SNicholas Bellinger tmr_tpg = tmr->task_cmd->se_sess->se_tpg; 400d050ffb9SNicholas Bellinger if (tmr_nacl && tmr_tpg) { 401d050ffb9SNicholas Bellinger pr_debug("LUN_RESET: TMR caller fabric: %s" 402d050ffb9SNicholas Bellinger " initiator port %s\n", 403d050ffb9SNicholas Bellinger tmr_tpg->se_tpg_tfo->get_fabric_name(), 404d050ffb9SNicholas Bellinger tmr_nacl->initiatorname); 405d050ffb9SNicholas Bellinger } 406d050ffb9SNicholas Bellinger } 407d050ffb9SNicholas Bellinger pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n", 408d050ffb9SNicholas Bellinger (preempt_and_abort_list) ? "Preempt" : "TMR", 409d050ffb9SNicholas Bellinger dev->transport->name, tas); 410d050ffb9SNicholas Bellinger 411d050ffb9SNicholas Bellinger core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list); 412cf572a96SChristoph Hellwig core_tmr_drain_state_list(dev, prout_cmd, tmr_nacl, tas, 413d050ffb9SNicholas Bellinger preempt_and_abort_list); 414af877292SChristoph Hellwig 415c66ac9dbSNicholas Bellinger /* 416c66ac9dbSNicholas Bellinger * Clear any legacy SPC-2 reservation when called during 417c66ac9dbSNicholas Bellinger * LOGICAL UNIT RESET 418c66ac9dbSNicholas Bellinger */ 4196708bb27SAndy Grover if (!preempt_and_abort_list && 4200fd97ccfSChristoph Hellwig (dev->dev_reservation_flags & DRF_SPC2_RESERVATIONS)) { 421c66ac9dbSNicholas Bellinger spin_lock(&dev->dev_reservation_lock); 422c66ac9dbSNicholas Bellinger dev->dev_reserved_node_acl = NULL; 4230fd97ccfSChristoph Hellwig dev->dev_reservation_flags &= ~DRF_SPC2_RESERVATIONS; 424c66ac9dbSNicholas Bellinger spin_unlock(&dev->dev_reservation_lock); 4256708bb27SAndy Grover pr_debug("LUN_RESET: SCSI-2 Released reservation\n"); 426c66ac9dbSNicholas Bellinger } 427c66ac9dbSNicholas Bellinger 428ee480683SNicholas Bellinger atomic_long_inc(&dev->num_resets); 429c66ac9dbSNicholas Bellinger 4306708bb27SAndy Grover pr_debug("LUN_RESET: %s for [%s] Complete\n", 431c66ac9dbSNicholas Bellinger (preempt_and_abort_list) ? "Preempt" : "TMR", 432e3d6f909SAndy Grover dev->transport->name); 433c66ac9dbSNicholas Bellinger return 0; 434c66ac9dbSNicholas Bellinger } 435d050ffb9SNicholas Bellinger 436