[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / target / target_core_tmr.c

/*******************************************************************************
 * Filename:  target_core_tmr.c
 *
 * This file contains SPC-3 task management infrastructure
 *
 * Copyright (c) 2009,2010 Rising Tide Systems
 * Copyright (c) 2009,2010 Linux-iSCSI.org
 *
 * Nicholas A. Bellinger <nab@kernel.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 ******************************************************************************/

#include <linux/version.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>

#include <target/target_core_base.h>
#include <target/target_core_device.h>
#include <target/target_core_tmr.h>
#include <target/target_core_transport.h>
#include <target/target_core_fabric_ops.h>
#include <target/target_core_configfs.h>

#include "target_core_alua.h"
#include "target_core_pr.h"

struct se_tmr_req *core_tmr_alloc_req(
	struct se_cmd *se_cmd,
	void *fabric_tmr_ptr,
	u8 function)
{
	struct se_tmr_req *tmr;

	tmr = kmem_cache_zalloc(se_tmr_req_cache, (in_interrupt()) ?
					GFP_ATOMIC : GFP_KERNEL);
	if (!tmr) {
		pr_err("Unable to allocate struct se_tmr_req\n");
		return ERR_PTR(-ENOMEM);
	}
	tmr->task_cmd = se_cmd;
	tmr->fabric_tmr_ptr = fabric_tmr_ptr;
	tmr->function = function;
	INIT_LIST_HEAD(&tmr->tmr_list);

	return tmr;
}
EXPORT_SYMBOL(core_tmr_alloc_req);

void core_tmr_release_req(
	struct se_tmr_req *tmr)
{
	struct se_device *dev = tmr->tmr_dev;

	if (!dev) {
		kmem_cache_free(se_tmr_req_cache, tmr);
		return;
	}

	spin_lock_irq(&dev->se_tmr_lock);
	list_del(&tmr->tmr_list);
	spin_unlock_irq(&dev->se_tmr_lock);

	kmem_cache_free(se_tmr_req_cache, tmr);
}

static void core_tmr_handle_tas_abort(
	struct se_node_acl *tmr_nacl,
	struct se_cmd *cmd,
	int tas,
	int fe_count)
{
	if (!fe_count) {
		transport_cmd_finish_abort(cmd, 1);
		return;
	}
	/*
	 * TASK ABORTED status (TAS) bit support
	*/
	if ((tmr_nacl &&
	     (tmr_nacl == cmd->se_sess->se_node_acl)) || tas)
		transport_send_task_abort(cmd);

	transport_cmd_finish_abort(cmd, 0);
}

int core_tmr_lun_reset(
	struct se_device *dev,
	struct se_tmr_req *tmr,
	struct list_head *preempt_and_abort_list,
	struct se_cmd *prout_cmd)
{
	struct se_cmd *cmd, *tcmd;
	struct se_node_acl *tmr_nacl = NULL;
	struct se_portal_group *tmr_tpg = NULL;
	struct se_queue_obj *qobj = &dev->dev_queue_obj;
	struct se_tmr_req *tmr_p, *tmr_pp;
	struct se_task *task, *task_tmp;
	unsigned long flags;
	int fe_count, tas;
	/*
	 * TASK_ABORTED status bit, this is configurable via ConfigFS
	 * struct se_device attributes.  spc4r17 section 7.4.6 Control mode page
	 *
	 * A task aborted status (TAS) bit set to zero specifies that aborted
	 * tasks shall be terminated by the device server without any response
	 * to the application client. A TAS bit set to one specifies that tasks
	 * aborted by the actions of an I_T nexus other than the I_T nexus on
	 * which the command was received shall be completed with TASK ABORTED
	 * status (see SAM-4).
	 */
	tas = dev->se_sub_dev->se_dev_attrib.emulate_tas;
	/*
	 * Determine if this se_tmr is coming from a $FABRIC_MOD
	 * or struct se_device passthrough..
	 */
	if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
		tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
		tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
		if (tmr_nacl && tmr_tpg) {
			pr_debug("LUN_RESET: TMR caller fabric: %s"
				" initiator port %s\n",
				tmr_tpg->se_tpg_tfo->get_fabric_name(),
				tmr_nacl->initiatorname);
		}
	}
	pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
		(preempt_and_abort_list) ? "Preempt" : "TMR",
		dev->transport->name, tas);
	/*
	 * Release all pending and outgoing TMRs aside from the received
	 * LUN_RESET tmr..
	 */
	spin_lock_irq(&dev->se_tmr_lock);
	list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
		/*
		 * Allow the received TMR to return with FUNCTION_COMPLETE.
		 */
		if (tmr && (tmr_p == tmr))
			continue;

		cmd = tmr_p->task_cmd;
		if (!cmd) {
			pr_err("Unable to locate struct se_cmd for TMR\n");
			continue;
		}
		/*
		 * If this function was called with a valid pr_res_key
		 * parameter (eg: for PROUT PREEMPT_AND_ABORT service action
		 * skip non regisration key matching TMRs.
		 */
		if (preempt_and_abort_list &&
		    (core_scsi3_check_cdb_abort_and_preempt(
					preempt_and_abort_list, cmd) != 0))
			continue;
		spin_unlock_irq(&dev->se_tmr_lock);

		spin_lock_irqsave(&cmd->t_state_lock, flags);
		if (!atomic_read(&cmd->t_transport_active)) {
			spin_unlock_irqrestore(&cmd->t_state_lock, flags);
			spin_lock_irq(&dev->se_tmr_lock);
			continue;
		}
		if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
			spin_unlock_irqrestore(&cmd->t_state_lock, flags);
			spin_lock_irq(&dev->se_tmr_lock);
			continue;
		}
		pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
			" Response: 0x%02x, t_state: %d\n",
			(preempt_and_abort_list) ? "Preempt" : "", tmr_p,
			tmr_p->function, tmr_p->response, cmd->t_state);
		spin_unlock_irqrestore(&cmd->t_state_lock, flags);

		transport_cmd_finish_abort_tmr(cmd);
		spin_lock_irq(&dev->se_tmr_lock);
	}
	spin_unlock_irq(&dev->se_tmr_lock);
	/*
	 * Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status.
	 * This is following sam4r17, section 5.6 Aborting commands, Table 38
	 * for TMR LUN_RESET:
	 *
	 * a) "Yes" indicates that each command that is aborted on an I_T nexus
	 * other than the one that caused the SCSI device condition is
	 * completed with TASK ABORTED status, if the TAS bit is set to one in
	 * the Control mode page (see SPC-4). "No" indicates that no status is
	 * returned for aborted commands.
	 *
	 * d) If the logical unit reset is caused by a particular I_T nexus
	 * (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
	 * (TASK_ABORTED status) applies.
	 *
	 * Otherwise (e.g., if triggered by a hard reset), "no"
	 * (no TASK_ABORTED SAM status) applies.
	 *
	 * Note that this seems to be independent of TAS (Task Aborted Status)
	 * in the Control Mode Page.
	 */
	spin_lock_irqsave(&dev->execute_task_lock, flags);
	list_for_each_entry_safe(task, task_tmp, &dev->state_task_list,
				t_state_list) {
		if (!task->task_se_cmd) {
			pr_err("task->task_se_cmd is NULL!\n");
			continue;
		}
		cmd = task->task_se_cmd;

		/*
		 * For PREEMPT_AND_ABORT usage, only process commands
		 * with a matching reservation key.
		 */
		if (preempt_and_abort_list &&
		    (core_scsi3_check_cdb_abort_and_preempt(
					preempt_and_abort_list, cmd) != 0))
			continue;
		/*
		 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
		 */
		if (prout_cmd == cmd)
			continue;

		list_del(&task->t_state_list);
		atomic_set(&task->task_state_active, 0);
		spin_unlock_irqrestore(&dev->execute_task_lock, flags);

		spin_lock_irqsave(&cmd->t_state_lock, flags);
		pr_debug("LUN_RESET: %s cmd: %p task: %p"
			" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state/"
			"def_t_state: %d/%d cdb: 0x%02x\n",
			(preempt_and_abort_list) ? "Preempt" : "", cmd, task,
			cmd->se_tfo->get_task_tag(cmd), 0,
			cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
			cmd->deferred_t_state, cmd->t_task_cdb[0]);
		pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
			" t_task_cdbs: %d t_task_cdbs_left: %d"
			" t_task_cdbs_sent: %d -- t_transport_active: %d"
			" t_transport_stop: %d t_transport_sent: %d\n",
			cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key,
			cmd->t_task_list_num,
			atomic_read(&cmd->t_task_cdbs_left),
			atomic_read(&cmd->t_task_cdbs_sent),
			atomic_read(&cmd->t_transport_active),
			atomic_read(&cmd->t_transport_stop),
			atomic_read(&cmd->t_transport_sent));

		if (atomic_read(&task->task_active)) {
			atomic_set(&task->task_stop, 1);
			spin_unlock_irqrestore(
				&cmd->t_state_lock, flags);

			pr_debug("LUN_RESET: Waiting for task: %p to shutdown"
				" for dev: %p\n", task, dev);
			wait_for_completion(&task->task_stop_comp);
			pr_debug("LUN_RESET Completed task: %p shutdown for"
				" dev: %p\n", task, dev);
			spin_lock_irqsave(&cmd->t_state_lock, flags);
			atomic_dec(&cmd->t_task_cdbs_left);

			atomic_set(&task->task_active, 0);
			atomic_set(&task->task_stop, 0);
		} else {
			if (atomic_read(&task->task_execute_queue) != 0)
				transport_remove_task_from_execute_queue(task, dev);
		}
		__transport_stop_task_timer(task, &flags);

		if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
			spin_unlock_irqrestore(
					&cmd->t_state_lock, flags);
			pr_debug("LUN_RESET: Skipping task: %p, dev: %p for"
				" t_task_cdbs_ex_left: %d\n", task, dev,
				atomic_read(&cmd->t_task_cdbs_ex_left));

			spin_lock_irqsave(&dev->execute_task_lock, flags);
			continue;
		}
		fe_count = atomic_read(&cmd->t_fe_count);

		if (atomic_read(&cmd->t_transport_active)) {
			pr_debug("LUN_RESET: got t_transport_active = 1 for"
				" task: %p, t_fe_count: %d dev: %p\n", task,
				fe_count, dev);
			atomic_set(&cmd->t_transport_aborted, 1);
			spin_unlock_irqrestore(&cmd->t_state_lock,
						flags);
			core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);

			spin_lock_irqsave(&dev->execute_task_lock, flags);
			continue;
		}
		pr_debug("LUN_RESET: Got t_transport_active = 0 for task: %p,"
			" t_fe_count: %d dev: %p\n", task, fe_count, dev);
		atomic_set(&cmd->t_transport_aborted, 1);
		spin_unlock_irqrestore(&cmd->t_state_lock, flags);
		core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);

		spin_lock_irqsave(&dev->execute_task_lock, flags);
	}
	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
	/*
	 * Release all commands remaining in the struct se_device cmd queue.
	 *
	 * This follows the same logic as above for the struct se_device
	 * struct se_task state list, where commands are returned with
	 * TASK_ABORTED status, if there is an outstanding $FABRIC_MOD
	 * reference, otherwise the struct se_cmd is released.
	 */
	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
	list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) {
		/*
		 * For PREEMPT_AND_ABORT usage, only process commands
		 * with a matching reservation key.
		 */
		if (preempt_and_abort_list &&
		    (core_scsi3_check_cdb_abort_and_preempt(
					preempt_and_abort_list, cmd) != 0))
			continue;
		/*
		 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
		 */
		if (prout_cmd == cmd)
			continue;

		atomic_dec(&cmd->t_transport_queue_active);
		atomic_dec(&qobj->queue_cnt);
		list_del(&cmd->se_queue_node);
		spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);

		pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
			" %d t_fe_count: %d\n", (preempt_and_abort_list) ?
			"Preempt" : "", cmd, cmd->t_state,
			atomic_read(&cmd->t_fe_count));
		/*
		 * Signal that the command has failed via cmd->se_cmd_flags,
		 */
		transport_new_cmd_failure(cmd);

		core_tmr_handle_tas_abort(tmr_nacl, cmd, tas,
				atomic_read(&cmd->t_fe_count));
		spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
	}
	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
	/*
	 * Clear any legacy SPC-2 reservation when called during
	 * LOGICAL UNIT RESET
	 */
	if (!preempt_and_abort_list &&
	     (dev->dev_flags & DF_SPC2_RESERVATIONS)) {
		spin_lock(&dev->dev_reservation_lock);
		dev->dev_reserved_node_acl = NULL;
		dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
		spin_unlock(&dev->dev_reservation_lock);
		pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
	}

	spin_lock_irq(&dev->stats_lock);
	dev->num_resets++;
	spin_unlock_irq(&dev->stats_lock);

	pr_debug("LUN_RESET: %s for [%s] Complete\n",
			(preempt_and_abort_list) ? "Preempt" : "TMR",
			dev->transport->name);
	return 0;
}
Commit	Line	Data
c66ac9db NB	1	/*******************************************************************************
	2	* Filename: target_core_tmr.c
	3	*
	4	* This file contains SPC-3 task management infrastructure
	5	*
	6	* Copyright (c) 2009,2010 Rising Tide Systems
	7	* Copyright (c) 2009,2010 Linux-iSCSI.org
	8	*
	9	* Nicholas A. Bellinger <nab@kernel.org>
	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of the GNU General Public License as published by
	13	* the Free Software Foundation; either version 2 of the License, or
	14	* (at your option) any later version.
	15	*
	16	* This program is distributed in the hope that it will be useful,
	17	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	19	* GNU General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with this program; if not, write to the Free Software
	23	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	24	*
	25	******************************************************************************/
	26
	27	#include <linux/version.h>
	28	#include <linux/slab.h>
	29	#include <linux/spinlock.h>
	30	#include <linux/list.h>
	31	#include <scsi/scsi.h>
	32	#include <scsi/scsi_cmnd.h>
	33
	34	#include <target/target_core_base.h>
	35	#include <target/target_core_device.h>
	36	#include <target/target_core_tmr.h>
	37	#include <target/target_core_transport.h>
	38	#include <target/target_core_fabric_ops.h>
	39	#include <target/target_core_configfs.h>
	40
	41	#include "target_core_alua.h"
	42	#include "target_core_pr.h"
	43
c66ac9db NB	44	struct se_tmr_req *core_tmr_alloc_req(
	45	struct se_cmd *se_cmd,
	46	void *fabric_tmr_ptr,
	47	u8 function)
	48	{
	49	struct se_tmr_req *tmr;
	50
1e7de68c NB	51	tmr = kmem_cache_zalloc(se_tmr_req_cache, (in_interrupt()) ?
1e7de68c NB	52	GFP_ATOMIC : GFP_KERNEL);
6708bb27 AG	53	if (!tmr) {
6708bb27 AG	54	pr_err("Unable to allocate struct se_tmr_req\n");
c66ac9db NB	55	return ERR_PTR(-ENOMEM);
	56	}
	57	tmr->task_cmd = se_cmd;
	58	tmr->fabric_tmr_ptr = fabric_tmr_ptr;
	59	tmr->function = function;
	60	INIT_LIST_HEAD(&tmr->tmr_list);
	61
	62	return tmr;
	63	}
	64	EXPORT_SYMBOL(core_tmr_alloc_req);
	65
	66	void core_tmr_release_req(
	67	struct se_tmr_req *tmr)
	68	{
	69	struct se_device *dev = tmr->tmr_dev;
	70
7fd29aa9 NB	71	if (!dev) {
	72	kmem_cache_free(se_tmr_req_cache, tmr);
	73	return;
	74	}
	75
5e1be919	76	spin_lock_irq(&dev->se_tmr_lock);
c66ac9db	77	list_del(&tmr->tmr_list);
5e1be919	78	spin_unlock_irq(&dev->se_tmr_lock);
7fd29aa9 NB	79
7fd29aa9 NB	80	kmem_cache_free(se_tmr_req_cache, tmr);
c66ac9db NB	81	}
	82
	83	static void core_tmr_handle_tas_abort(
	84	struct se_node_acl *tmr_nacl,
	85	struct se_cmd *cmd,
	86	int tas,
	87	int fe_count)
	88	{
6708bb27	89	if (!fe_count) {
c66ac9db NB	90	transport_cmd_finish_abort(cmd, 1);
	91	return;
	92	}
	93	/*
	94	* TASK ABORTED status (TAS) bit support
	95	*/
6708bb27	96	if ((tmr_nacl &&
c66ac9db NB	97	(tmr_nacl == cmd->se_sess->se_node_acl)) \|\| tas)
	98	transport_send_task_abort(cmd);
	99
	100	transport_cmd_finish_abort(cmd, 0);
	101	}
	102
	103	int core_tmr_lun_reset(
	104	struct se_device *dev,
	105	struct se_tmr_req *tmr,
	106	struct list_head *preempt_and_abort_list,
	107	struct se_cmd *prout_cmd)
	108	{
5951146d	109	struct se_cmd cmd, tcmd;
c66ac9db NB	110	struct se_node_acl *tmr_nacl = NULL;
c66ac9db NB	111	struct se_portal_group *tmr_tpg = NULL;
e3d6f909	112	struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db NB	113	struct se_tmr_req tmr_p, tmr_pp;
	114	struct se_task task, task_tmp;
	115	unsigned long flags;
5951146d	116	int fe_count, tas;
c66ac9db NB	117	/*
	118	* TASK_ABORTED status bit, this is configurable via ConfigFS
	119	* struct se_device attributes. spc4r17 section 7.4.6 Control mode page
	120	*
	121	* A task aborted status (TAS) bit set to zero specifies that aborted
	122	* tasks shall be terminated by the device server without any response
	123	* to the application client. A TAS bit set to one specifies that tasks
	124	* aborted by the actions of an I_T nexus other than the I_T nexus on
	125	* which the command was received shall be completed with TASK ABORTED
	126	* status (see SAM-4).
	127	*/
e3d6f909	128	tas = dev->se_sub_dev->se_dev_attrib.emulate_tas;
c66ac9db NB	129	/*
	130	* Determine if this se_tmr is coming from a $FABRIC_MOD
	131	* or struct se_device passthrough..
	132	*/
	133	if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
	134	tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
	135	tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
	136	if (tmr_nacl && tmr_tpg) {
6708bb27	137	pr_debug("LUN_RESET: TMR caller fabric: %s"
c66ac9db	138	" initiator port %s\n",
e3d6f909	139	tmr_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db NB	140	tmr_nacl->initiatorname);
	141	}
	142	}
6708bb27	143	pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
c66ac9db	144	(preempt_and_abort_list) ? "Preempt" : "TMR",
e3d6f909	145	dev->transport->name, tas);
c66ac9db NB	146	/*
	147	* Release all pending and outgoing TMRs aside from the received
	148	* LUN_RESET tmr..
	149	*/
5e1be919	150	spin_lock_irq(&dev->se_tmr_lock);
c66ac9db NB	151	list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
	152	/*
	153	* Allow the received TMR to return with FUNCTION_COMPLETE.
	154	*/
	155	if (tmr && (tmr_p == tmr))
	156	continue;
	157
	158	cmd = tmr_p->task_cmd;
6708bb27 AG	159	if (!cmd) {
6708bb27 AG	160	pr_err("Unable to locate struct se_cmd for TMR\n");
c66ac9db NB	161	continue;
	162	}
	163	/*
	164	* If this function was called with a valid pr_res_key
	165	* parameter (eg: for PROUT PREEMPT_AND_ABORT service action
	166	* skip non regisration key matching TMRs.
	167	*/
6708bb27	168	if (preempt_and_abort_list &&
c66ac9db NB	169	(core_scsi3_check_cdb_abort_and_preempt(
	170	preempt_and_abort_list, cmd) != 0))
	171	continue;
5e1be919	172	spin_unlock_irq(&dev->se_tmr_lock);
c66ac9db	173
a1d8b49a	174	spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27	175	if (!atomic_read(&cmd->t_transport_active)) {
a1d8b49a	176	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
5e1be919	177	spin_lock_irq(&dev->se_tmr_lock);
c66ac9db NB	178	continue;
	179	}
	180	if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
a1d8b49a	181	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
5e1be919	182	spin_lock_irq(&dev->se_tmr_lock);
c66ac9db NB	183	continue;
c66ac9db NB	184	}
6708bb27	185	pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
c66ac9db NB	186	" Response: 0x%02x, t_state: %d\n",
	187	(preempt_and_abort_list) ? "Preempt" : "", tmr_p,
	188	tmr_p->function, tmr_p->response, cmd->t_state);
a1d8b49a	189	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db NB	190
c66ac9db NB	191	transport_cmd_finish_abort_tmr(cmd);
5e1be919	192	spin_lock_irq(&dev->se_tmr_lock);
c66ac9db	193	}
5e1be919	194	spin_unlock_irq(&dev->se_tmr_lock);
c66ac9db NB	195	/*
	196	* Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status.
	197	* This is following sam4r17, section 5.6 Aborting commands, Table 38
	198	* for TMR LUN_RESET:
	199	*
	200	* a) "Yes" indicates that each command that is aborted on an I_T nexus
	201	* other than the one that caused the SCSI device condition is
	202	* completed with TASK ABORTED status, if the TAS bit is set to one in
	203	* the Control mode page (see SPC-4). "No" indicates that no status is
	204	* returned for aborted commands.
	205	*
	206	* d) If the logical unit reset is caused by a particular I_T nexus
	207	* (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
	208	* (TASK_ABORTED status) applies.
	209	*
	210	* Otherwise (e.g., if triggered by a hard reset), "no"
	211	* (no TASK_ABORTED SAM status) applies.
	212	*
	213	* Note that this seems to be independent of TAS (Task Aborted Status)
	214	* in the Control Mode Page.
	215	*/
	216	spin_lock_irqsave(&dev->execute_task_lock, flags);
	217	list_for_each_entry_safe(task, task_tmp, &dev->state_task_list,
	218	t_state_list) {
e3d6f909	219	if (!task->task_se_cmd) {
6708bb27	220	pr_err("task->task_se_cmd is NULL!\n");
c66ac9db NB	221	continue;
c66ac9db NB	222	}
e3d6f909	223	cmd = task->task_se_cmd;
c66ac9db	224
c66ac9db NB	225	/*
	226	* For PREEMPT_AND_ABORT usage, only process commands
	227	* with a matching reservation key.
	228	*/
6708bb27	229	if (preempt_and_abort_list &&
c66ac9db NB	230	(core_scsi3_check_cdb_abort_and_preempt(
	231	preempt_and_abort_list, cmd) != 0))
	232	continue;
	233	/*
	234	* Not aborting PROUT PREEMPT_AND_ABORT CDB..
	235	*/
	236	if (prout_cmd == cmd)
	237	continue;
	238
	239	list_del(&task->t_state_list);
	240	atomic_set(&task->task_state_active, 0);
	241	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
	242
a1d8b49a	243	spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27	244	pr_debug("LUN_RESET: %s cmd: %p task: %p"
c66ac9db NB	245	" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state/"
	246	"def_t_state: %d/%d cdb: 0x%02x\n",
	247	(preempt_and_abort_list) ? "Preempt" : "", cmd, task,
e3d6f909 AG	248	cmd->se_tfo->get_task_tag(cmd), 0,
e3d6f909 AG	249	cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
a1d8b49a	250	cmd->deferred_t_state, cmd->t_task_cdb[0]);
6708bb27	251	pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
c66ac9db NB	252	" t_task_cdbs: %d t_task_cdbs_left: %d"
	253	" t_task_cdbs_sent: %d -- t_transport_active: %d"
	254	" t_transport_stop: %d t_transport_sent: %d\n",
e3d6f909	255	cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key,
a1d8b49a AG	256	cmd->t_task_list_num,
	257	atomic_read(&cmd->t_task_cdbs_left),
	258	atomic_read(&cmd->t_task_cdbs_sent),
	259	atomic_read(&cmd->t_transport_active),
	260	atomic_read(&cmd->t_transport_stop),
	261	atomic_read(&cmd->t_transport_sent));
c66ac9db NB	262
	263	if (atomic_read(&task->task_active)) {
	264	atomic_set(&task->task_stop, 1);
	265	spin_unlock_irqrestore(
a1d8b49a	266	&cmd->t_state_lock, flags);
c66ac9db	267
6708bb27	268	pr_debug("LUN_RESET: Waiting for task: %p to shutdown"
c66ac9db NB	269	" for dev: %p\n", task, dev);
c66ac9db NB	270	wait_for_completion(&task->task_stop_comp);
6708bb27	271	pr_debug("LUN_RESET Completed task: %p shutdown for"
c66ac9db	272	" dev: %p\n", task, dev);
a1d8b49a AG	273	spin_lock_irqsave(&cmd->t_state_lock, flags);
a1d8b49a AG	274	atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db NB	275
	276	atomic_set(&task->task_active, 0);
	277	atomic_set(&task->task_stop, 0);
52208ae3 NB	278	} else {
	279	if (atomic_read(&task->task_execute_queue) != 0)
	280	transport_remove_task_from_execute_queue(task, dev);
c66ac9db NB	281	}
	282	__transport_stop_task_timer(task, &flags);
	283
6708bb27	284	if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
c66ac9db	285	spin_unlock_irqrestore(
a1d8b49a	286	&cmd->t_state_lock, flags);
6708bb27	287	pr_debug("LUN_RESET: Skipping task: %p, dev: %p for"
c66ac9db	288	" t_task_cdbs_ex_left: %d\n", task, dev,
a1d8b49a	289	atomic_read(&cmd->t_task_cdbs_ex_left));
c66ac9db NB	290
	291	spin_lock_irqsave(&dev->execute_task_lock, flags);
	292	continue;
	293	}
a1d8b49a	294	fe_count = atomic_read(&cmd->t_fe_count);
c66ac9db	295
a1d8b49a	296	if (atomic_read(&cmd->t_transport_active)) {
6708bb27	297	pr_debug("LUN_RESET: got t_transport_active = 1 for"
c66ac9db NB	298	" task: %p, t_fe_count: %d dev: %p\n", task,
c66ac9db NB	299	fe_count, dev);
a1d8b49a AG	300	atomic_set(&cmd->t_transport_aborted, 1);
a1d8b49a AG	301	spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db NB	302	flags);
	303	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
	304
	305	spin_lock_irqsave(&dev->execute_task_lock, flags);
	306	continue;
	307	}
6708bb27	308	pr_debug("LUN_RESET: Got t_transport_active = 0 for task: %p,"
c66ac9db	309	" t_fe_count: %d dev: %p\n", task, fe_count, dev);
a1d8b49a AG	310	atomic_set(&cmd->t_transport_aborted, 1);
a1d8b49a AG	311	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db NB	312	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
	313
	314	spin_lock_irqsave(&dev->execute_task_lock, flags);
	315	}
	316	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
	317	/*
	318	* Release all commands remaining in the struct se_device cmd queue.
	319	*
	320	* This follows the same logic as above for the struct se_device
	321	* struct se_task state list, where commands are returned with
	322	* TASK_ABORTED status, if there is an outstanding $FABRIC_MOD
	323	* reference, otherwise the struct se_cmd is released.
	324	*/
	325	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
5951146d	326	list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) {
c66ac9db NB	327	/*
	328	* For PREEMPT_AND_ABORT usage, only process commands
	329	* with a matching reservation key.
	330	*/
6708bb27	331	if (preempt_and_abort_list &&
c66ac9db NB	332	(core_scsi3_check_cdb_abort_and_preempt(
	333	preempt_and_abort_list, cmd) != 0))
	334	continue;
	335	/*
	336	* Not aborting PROUT PREEMPT_AND_ABORT CDB..
	337	*/
	338	if (prout_cmd == cmd)
	339	continue;
	340
a1d8b49a	341	atomic_dec(&cmd->t_transport_queue_active);
c66ac9db	342	atomic_dec(&qobj->queue_cnt);
5951146d	343	list_del(&cmd->se_queue_node);
c66ac9db NB	344	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
c66ac9db NB	345
6708bb27	346	pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
c66ac9db	347	" %d t_fe_count: %d\n", (preempt_and_abort_list) ?
5951146d	348	"Preempt" : "", cmd, cmd->t_state,
a1d8b49a	349	atomic_read(&cmd->t_fe_count));
c66ac9db NB	350	/*
c66ac9db NB	351	* Signal that the command has failed via cmd->se_cmd_flags,
c66ac9db NB	352	*/
	353	transport_new_cmd_failure(cmd);
	354
	355	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas,
a1d8b49a	356	atomic_read(&cmd->t_fe_count));
c66ac9db NB	357	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
	358	}
	359	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
	360	/*
	361	* Clear any legacy SPC-2 reservation when called during
	362	* LOGICAL UNIT RESET
	363	*/
6708bb27	364	if (!preempt_and_abort_list &&
c66ac9db NB	365	(dev->dev_flags & DF_SPC2_RESERVATIONS)) {
	366	spin_lock(&dev->dev_reservation_lock);
	367	dev->dev_reserved_node_acl = NULL;
	368	dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
	369	spin_unlock(&dev->dev_reservation_lock);
6708bb27	370	pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
c66ac9db NB	371	}
c66ac9db NB	372
1e7de68c	373	spin_lock_irq(&dev->stats_lock);
c66ac9db	374	dev->num_resets++;
1e7de68c	375	spin_unlock_irq(&dev->stats_lock);
c66ac9db	376
6708bb27	377	pr_debug("LUN_RESET: %s for [%s] Complete\n",
c66ac9db	378	(preempt_and_abort_list) ? "Preempt" : "TMR",
e3d6f909	379	dev->transport->name);
c66ac9db NB	380	return 0;
c66ac9db NB	381	}