[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"

#define DEBUG_LUN_RESET
#ifdef DEBUG_LUN_RESET
#define DEBUG_LR(x...) printk(KERN_INFO x)
#else
#define DEBUG_LR(x...)
#endif

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)) {
		printk(KERN_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(&dev->se_tmr_lock);
	list_del(&tmr->tmr_list);
	spin_unlock(&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 != NULL) &&
	     (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) {
			DEBUG_LR("LUN_RESET: TMR caller fabric: %s"
				" initiator port %s\n",
				tmr_tpg->se_tpg_tfo->get_fabric_name(),
				tmr_nacl->initiatorname);
		}
	}
	DEBUG_LR("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(&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)) {
			printk(KERN_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 != NULL) &&
		    (core_scsi3_check_cdb_abort_and_preempt(
					preempt_and_abort_list, cmd) != 0))
			continue;
		spin_unlock(&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(&dev->se_tmr_lock);
			continue;
		}
		if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
			spin_unlock_irqrestore(&cmd->t_state_lock, flags);
			spin_lock(&dev->se_tmr_lock);
			continue;
		}
		DEBUG_LR("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(&dev->se_tmr_lock);
	}
	spin_unlock(&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) {
			printk(KERN_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 != NULL) &&
		    (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);
		DEBUG_LR("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]);
		DEBUG_LR("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);

			DEBUG_LR("LUN_RESET: Waiting for task: %p to shutdown"
				" for dev: %p\n", task, dev);
			wait_for_completion(&task->task_stop_comp);
			DEBUG_LR("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);
			DEBUG_LR("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)) {
			DEBUG_LR("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;
		}
		DEBUG_LR("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 != NULL) &&
		    (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);

		DEBUG_LR("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,
		 * and call TFO->new_cmd_failure() to wakeup any fabric
		 * dependent code used to wait for unsolicited data out
		 * allocation to complete.  The fabric module is expected
		 * to dump any remaining unsolicited data out for the aborted
		 * command at this point.
		 */
		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);
		printk(KERN_INFO "LUN_RESET: SCSI-2 Released reservation\n");
	}

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

	DEBUG_LR("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
	44	#define DEBUG_LUN_RESET
	45	#ifdef DEBUG_LUN_RESET
	46	#define DEBUG_LR(x...) printk(KERN_INFO x)
	47	#else
	48	#define DEBUG_LR(x...)
	49	#endif
	50
	51	struct se_tmr_req *core_tmr_alloc_req(
	52	struct se_cmd *se_cmd,
	53	void *fabric_tmr_ptr,
	54	u8 function)
	55	{
	56	struct se_tmr_req *tmr;
	57
1e7de68c NB	58	tmr = kmem_cache_zalloc(se_tmr_req_cache, (in_interrupt()) ?
1e7de68c NB	59	GFP_ATOMIC : GFP_KERNEL);
c66ac9db NB	60	if (!(tmr)) {
	61	printk(KERN_ERR "Unable to allocate struct se_tmr_req\n");
	62	return ERR_PTR(-ENOMEM);
	63	}
	64	tmr->task_cmd = se_cmd;
	65	tmr->fabric_tmr_ptr = fabric_tmr_ptr;
	66	tmr->function = function;
	67	INIT_LIST_HEAD(&tmr->tmr_list);
	68
	69	return tmr;
	70	}
	71	EXPORT_SYMBOL(core_tmr_alloc_req);
	72
	73	void core_tmr_release_req(
	74	struct se_tmr_req *tmr)
	75	{
	76	struct se_device *dev = tmr->tmr_dev;
	77
7fd29aa9 NB	78	if (!dev) {
	79	kmem_cache_free(se_tmr_req_cache, tmr);
	80	return;
	81	}
	82
c66ac9db NB	83	spin_lock(&dev->se_tmr_lock);
c66ac9db NB	84	list_del(&tmr->tmr_list);
c66ac9db	85	spin_unlock(&dev->se_tmr_lock);
7fd29aa9 NB	86
7fd29aa9 NB	87	kmem_cache_free(se_tmr_req_cache, tmr);
c66ac9db NB	88	}
	89
	90	static void core_tmr_handle_tas_abort(
	91	struct se_node_acl *tmr_nacl,
	92	struct se_cmd *cmd,
	93	int tas,
	94	int fe_count)
	95	{
	96	if (!(fe_count)) {
	97	transport_cmd_finish_abort(cmd, 1);
	98	return;
	99	}
	100	/*
	101	* TASK ABORTED status (TAS) bit support
	102	*/
	103	if (((tmr_nacl != NULL) &&
	104	(tmr_nacl == cmd->se_sess->se_node_acl)) \|\| tas)
	105	transport_send_task_abort(cmd);
	106
	107	transport_cmd_finish_abort(cmd, 0);
	108	}
	109
	110	int core_tmr_lun_reset(
	111	struct se_device *dev,
	112	struct se_tmr_req *tmr,
	113	struct list_head *preempt_and_abort_list,
	114	struct se_cmd *prout_cmd)
	115	{
5951146d	116	struct se_cmd cmd, tcmd;
c66ac9db NB	117	struct se_node_acl *tmr_nacl = NULL;
c66ac9db NB	118	struct se_portal_group *tmr_tpg = NULL;
e3d6f909	119	struct se_queue_obj *qobj = &dev->dev_queue_obj;
c66ac9db NB	120	struct se_tmr_req tmr_p, tmr_pp;
	121	struct se_task task, task_tmp;
	122	unsigned long flags;
5951146d	123	int fe_count, tas;
c66ac9db NB	124	/*
	125	* TASK_ABORTED status bit, this is configurable via ConfigFS
	126	* struct se_device attributes. spc4r17 section 7.4.6 Control mode page
	127	*
	128	* A task aborted status (TAS) bit set to zero specifies that aborted
	129	* tasks shall be terminated by the device server without any response
	130	* to the application client. A TAS bit set to one specifies that tasks
	131	* aborted by the actions of an I_T nexus other than the I_T nexus on
	132	* which the command was received shall be completed with TASK ABORTED
	133	* status (see SAM-4).
	134	*/
e3d6f909	135	tas = dev->se_sub_dev->se_dev_attrib.emulate_tas;
c66ac9db NB	136	/*
	137	* Determine if this se_tmr is coming from a $FABRIC_MOD
	138	* or struct se_device passthrough..
	139	*/
	140	if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
	141	tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
	142	tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
	143	if (tmr_nacl && tmr_tpg) {
	144	DEBUG_LR("LUN_RESET: TMR caller fabric: %s"
	145	" initiator port %s\n",
e3d6f909	146	tmr_tpg->se_tpg_tfo->get_fabric_name(),
c66ac9db NB	147	tmr_nacl->initiatorname);
	148	}
	149	}
	150	DEBUG_LR("LUN_RESET: %s starting for [%s], tas: %d\n",
	151	(preempt_and_abort_list) ? "Preempt" : "TMR",
e3d6f909	152	dev->transport->name, tas);
c66ac9db NB	153	/*
	154	* Release all pending and outgoing TMRs aside from the received
	155	* LUN_RESET tmr..
	156	*/
	157	spin_lock(&dev->se_tmr_lock);
	158	list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
	159	/*
	160	* Allow the received TMR to return with FUNCTION_COMPLETE.
	161	*/
	162	if (tmr && (tmr_p == tmr))
	163	continue;
	164
	165	cmd = tmr_p->task_cmd;
	166	if (!(cmd)) {
	167	printk(KERN_ERR "Unable to locate struct se_cmd for TMR\n");
	168	continue;
	169	}
	170	/*
	171	* If this function was called with a valid pr_res_key
	172	* parameter (eg: for PROUT PREEMPT_AND_ABORT service action
	173	* skip non regisration key matching TMRs.
	174	*/
	175	if ((preempt_and_abort_list != NULL) &&
	176	(core_scsi3_check_cdb_abort_and_preempt(
	177	preempt_and_abort_list, cmd) != 0))
	178	continue;
	179	spin_unlock(&dev->se_tmr_lock);
	180
a1d8b49a AG	181	spin_lock_irqsave(&cmd->t_state_lock, flags);
	182	if (!(atomic_read(&cmd->t_transport_active))) {
	183	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db NB	184	spin_lock(&dev->se_tmr_lock);
	185	continue;
	186	}
	187	if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
a1d8b49a	188	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db NB	189	spin_lock(&dev->se_tmr_lock);
	190	continue;
	191	}
	192	DEBUG_LR("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
	193	" Response: 0x%02x, t_state: %d\n",
	194	(preempt_and_abort_list) ? "Preempt" : "", tmr_p,
	195	tmr_p->function, tmr_p->response, cmd->t_state);
a1d8b49a	196	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db NB	197
	198	transport_cmd_finish_abort_tmr(cmd);
	199	spin_lock(&dev->se_tmr_lock);
	200	}
	201	spin_unlock(&dev->se_tmr_lock);
	202	/*
	203	* Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status.
	204	* This is following sam4r17, section 5.6 Aborting commands, Table 38
	205	* for TMR LUN_RESET:
	206	*
	207	* a) "Yes" indicates that each command that is aborted on an I_T nexus
	208	* other than the one that caused the SCSI device condition is
	209	* completed with TASK ABORTED status, if the TAS bit is set to one in
	210	* the Control mode page (see SPC-4). "No" indicates that no status is
	211	* returned for aborted commands.
	212	*
	213	* d) If the logical unit reset is caused by a particular I_T nexus
	214	* (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
	215	* (TASK_ABORTED status) applies.
	216	*
	217	* Otherwise (e.g., if triggered by a hard reset), "no"
	218	* (no TASK_ABORTED SAM status) applies.
	219	*
	220	* Note that this seems to be independent of TAS (Task Aborted Status)
	221	* in the Control Mode Page.
	222	*/
	223	spin_lock_irqsave(&dev->execute_task_lock, flags);
	224	list_for_each_entry_safe(task, task_tmp, &dev->state_task_list,
	225	t_state_list) {
e3d6f909 AG	226	if (!task->task_se_cmd) {
e3d6f909 AG	227	printk(KERN_ERR "task->task_se_cmd is NULL!\n");
c66ac9db NB	228	continue;
c66ac9db NB	229	}
e3d6f909	230	cmd = task->task_se_cmd;
c66ac9db	231
c66ac9db NB	232	/*
	233	* For PREEMPT_AND_ABORT usage, only process commands
	234	* with a matching reservation key.
	235	*/
	236	if ((preempt_and_abort_list != NULL) &&
	237	(core_scsi3_check_cdb_abort_and_preempt(
	238	preempt_and_abort_list, cmd) != 0))
	239	continue;
	240	/*
	241	* Not aborting PROUT PREEMPT_AND_ABORT CDB..
	242	*/
	243	if (prout_cmd == cmd)
	244	continue;
	245
	246	list_del(&task->t_state_list);
	247	atomic_set(&task->task_state_active, 0);
	248	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
	249
a1d8b49a	250	spin_lock_irqsave(&cmd->t_state_lock, flags);
c66ac9db NB	251	DEBUG_LR("LUN_RESET: %s cmd: %p task: %p"
	252	" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state/"
	253	"def_t_state: %d/%d cdb: 0x%02x\n",
	254	(preempt_and_abort_list) ? "Preempt" : "", cmd, task,
e3d6f909 AG	255	cmd->se_tfo->get_task_tag(cmd), 0,
e3d6f909 AG	256	cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
a1d8b49a	257	cmd->deferred_t_state, cmd->t_task_cdb[0]);
c66ac9db NB	258	DEBUG_LR("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
	259	" t_task_cdbs: %d t_task_cdbs_left: %d"
	260	" t_task_cdbs_sent: %d -- t_transport_active: %d"
	261	" t_transport_stop: %d t_transport_sent: %d\n",
e3d6f909	262	cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key,
a1d8b49a AG	263	cmd->t_task_list_num,
	264	atomic_read(&cmd->t_task_cdbs_left),
	265	atomic_read(&cmd->t_task_cdbs_sent),
	266	atomic_read(&cmd->t_transport_active),
	267	atomic_read(&cmd->t_transport_stop),
	268	atomic_read(&cmd->t_transport_sent));
c66ac9db NB	269
	270	if (atomic_read(&task->task_active)) {
	271	atomic_set(&task->task_stop, 1);
	272	spin_unlock_irqrestore(
a1d8b49a	273	&cmd->t_state_lock, flags);
c66ac9db NB	274
	275	DEBUG_LR("LUN_RESET: Waiting for task: %p to shutdown"
	276	" for dev: %p\n", task, dev);
	277	wait_for_completion(&task->task_stop_comp);
	278	DEBUG_LR("LUN_RESET Completed task: %p shutdown for"
	279	" dev: %p\n", task, dev);
a1d8b49a AG	280	spin_lock_irqsave(&cmd->t_state_lock, flags);
a1d8b49a AG	281	atomic_dec(&cmd->t_task_cdbs_left);
c66ac9db NB	282
	283	atomic_set(&task->task_active, 0);
	284	atomic_set(&task->task_stop, 0);
52208ae3 NB	285	} else {
	286	if (atomic_read(&task->task_execute_queue) != 0)
	287	transport_remove_task_from_execute_queue(task, dev);
c66ac9db NB	288	}
	289	__transport_stop_task_timer(task, &flags);
	290
a1d8b49a	291	if (!(atomic_dec_and_test(&cmd->t_task_cdbs_ex_left))) {
c66ac9db	292	spin_unlock_irqrestore(
a1d8b49a	293	&cmd->t_state_lock, flags);
c66ac9db NB	294	DEBUG_LR("LUN_RESET: Skipping task: %p, dev: %p for"
c66ac9db NB	295	" t_task_cdbs_ex_left: %d\n", task, dev,
a1d8b49a	296	atomic_read(&cmd->t_task_cdbs_ex_left));
c66ac9db NB	297
	298	spin_lock_irqsave(&dev->execute_task_lock, flags);
	299	continue;
	300	}
a1d8b49a	301	fe_count = atomic_read(&cmd->t_fe_count);
c66ac9db	302
a1d8b49a	303	if (atomic_read(&cmd->t_transport_active)) {
c66ac9db NB	304	DEBUG_LR("LUN_RESET: got t_transport_active = 1 for"
	305	" task: %p, t_fe_count: %d dev: %p\n", task,
	306	fe_count, dev);
a1d8b49a AG	307	atomic_set(&cmd->t_transport_aborted, 1);
a1d8b49a AG	308	spin_unlock_irqrestore(&cmd->t_state_lock,
c66ac9db NB	309	flags);
	310	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
	311
	312	spin_lock_irqsave(&dev->execute_task_lock, flags);
	313	continue;
	314	}
	315	DEBUG_LR("LUN_RESET: Got t_transport_active = 0 for task: %p,"
	316	" t_fe_count: %d dev: %p\n", task, fe_count, dev);
a1d8b49a AG	317	atomic_set(&cmd->t_transport_aborted, 1);
a1d8b49a AG	318	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db NB	319	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
	320
	321	spin_lock_irqsave(&dev->execute_task_lock, flags);
	322	}
	323	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
	324	/*
	325	* Release all commands remaining in the struct se_device cmd queue.
	326	*
	327	* This follows the same logic as above for the struct se_device
	328	* struct se_task state list, where commands are returned with
	329	* TASK_ABORTED status, if there is an outstanding $FABRIC_MOD
	330	* reference, otherwise the struct se_cmd is released.
	331	*/
	332	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
5951146d	333	list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) {
c66ac9db NB	334	/*
	335	* For PREEMPT_AND_ABORT usage, only process commands
	336	* with a matching reservation key.
	337	*/
	338	if ((preempt_and_abort_list != NULL) &&
	339	(core_scsi3_check_cdb_abort_and_preempt(
	340	preempt_and_abort_list, cmd) != 0))
	341	continue;
	342	/*
	343	* Not aborting PROUT PREEMPT_AND_ABORT CDB..
	344	*/
	345	if (prout_cmd == cmd)
	346	continue;
	347
a1d8b49a	348	atomic_dec(&cmd->t_transport_queue_active);
c66ac9db	349	atomic_dec(&qobj->queue_cnt);
5951146d	350	list_del(&cmd->se_queue_node);
c66ac9db NB	351	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
c66ac9db NB	352
c66ac9db NB	353	DEBUG_LR("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
c66ac9db NB	354	" %d t_fe_count: %d\n", (preempt_and_abort_list) ?
5951146d	355	"Preempt" : "", cmd, cmd->t_state,
a1d8b49a	356	atomic_read(&cmd->t_fe_count));
c66ac9db NB	357	/*
	358	* Signal that the command has failed via cmd->se_cmd_flags,
	359	* and call TFO->new_cmd_failure() to wakeup any fabric
	360	* dependent code used to wait for unsolicited data out
	361	* allocation to complete. The fabric module is expected
	362	* to dump any remaining unsolicited data out for the aborted
	363	* command at this point.
	364	*/
	365	transport_new_cmd_failure(cmd);
	366
	367	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas,
a1d8b49a	368	atomic_read(&cmd->t_fe_count));
c66ac9db NB	369	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
	370	}
	371	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
	372	/*
	373	* Clear any legacy SPC-2 reservation when called during
	374	* LOGICAL UNIT RESET
	375	*/
	376	if (!(preempt_and_abort_list) &&
	377	(dev->dev_flags & DF_SPC2_RESERVATIONS)) {
	378	spin_lock(&dev->dev_reservation_lock);
	379	dev->dev_reserved_node_acl = NULL;
	380	dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
	381	spin_unlock(&dev->dev_reservation_lock);
	382	printk(KERN_INFO "LUN_RESET: SCSI-2 Released reservation\n");
	383	}
	384
1e7de68c	385	spin_lock_irq(&dev->stats_lock);
c66ac9db	386	dev->num_resets++;
1e7de68c	387	spin_unlock_irq(&dev->stats_lock);
c66ac9db NB	388
	389	DEBUG_LR("LUN_RESET: %s for [%s] Complete\n",
	390	(preempt_and_abort_list) ? "Preempt" : "TMR",
e3d6f909	391	dev->transport->name);
c66ac9db NB	392	return 0;
c66ac9db NB	393	}