[mirror_ubuntu-bionic-kernel.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/slab.h>
#include <linux/spinlock.h>
#include <linux/list.h>
#include <linux/export.h>
#include <scsi/scsi.h>
#include <scsi/scsi_cmnd.h>

#include <target/target_core_base.h>
#include <target/target_core_backend.h>
#include <target/target_core_fabric.h>
#include <target/target_core_configfs.h>

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

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

	tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags);
	if (!tmr) {
		pr_err("Unable to allocate struct se_tmr_req\n");
		return -ENOMEM;
	}

	se_cmd->se_cmd_flags |= SCF_SCSI_TMR_CDB;
	se_cmd->se_tmr_req = tmr;
	tmr->task_cmd = se_cmd;
	tmr->fabric_tmr_ptr = fabric_tmr_ptr;
	tmr->function = function;
	INIT_LIST_HEAD(&tmr->tmr_list);

	return 0;
}
EXPORT_SYMBOL(core_tmr_alloc_req);

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

	if (!dev) {
		kfree(tmr);
		return;
	}

	spin_lock_irqsave(&dev->se_tmr_lock, flags);
	list_del(&tmr->tmr_list);
	spin_unlock_irqrestore(&dev->se_tmr_lock, flags);

	kfree(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);
}

static int target_check_cdb_and_preempt(struct list_head *list,
		struct se_cmd *cmd)
{
	struct t10_pr_registration *reg;

	if (!list)
		return 0;
	list_for_each_entry(reg, list, pr_reg_abort_list) {
		if (reg->pr_res_key == cmd->pr_res_key)
			return 0;
	}

	return 1;
}

void core_tmr_abort_task(
	struct se_device *dev,
	struct se_tmr_req *tmr,
	struct se_session *se_sess)
{
	struct se_cmd *se_cmd, *tmp_cmd;
	unsigned long flags;
	int ref_tag;

	spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
	list_for_each_entry_safe(se_cmd, tmp_cmd,
			&se_sess->sess_cmd_list, se_cmd_list) {

		if (dev != se_cmd->se_dev)
			continue;
		ref_tag = se_cmd->se_tfo->get_task_tag(se_cmd);
		if (tmr->ref_task_tag != ref_tag)
			continue;

		printk("ABORT_TASK: Found referenced %s task_tag: %u\n",
			se_cmd->se_tfo->get_fabric_name(), ref_tag);

		spin_lock(&se_cmd->t_state_lock);
		if (se_cmd->transport_state & CMD_T_COMPLETE) {
			printk("ABORT_TASK: ref_tag: %u already complete, skipping\n", ref_tag);
			spin_unlock(&se_cmd->t_state_lock);
			spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
			goto out;
		}
		se_cmd->transport_state |= CMD_T_ABORTED;
		spin_unlock(&se_cmd->t_state_lock);

		list_del_init(&se_cmd->se_cmd_list);
		kref_get(&se_cmd->cmd_kref);
		spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);

		cancel_work_sync(&se_cmd->work);
		transport_wait_for_tasks(se_cmd);
		/*
		 * Now send SAM_STAT_TASK_ABORTED status for the referenced
		 * se_cmd descriptor..
		 */
		transport_send_task_abort(se_cmd);
		/*
		 * Also deal with possible extra acknowledge reference..
		 */
		if (se_cmd->se_cmd_flags & SCF_ACK_KREF)
			target_put_sess_cmd(se_sess, se_cmd);

		target_put_sess_cmd(se_sess, se_cmd);

		printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for"
				" ref_tag: %d\n", ref_tag);
		tmr->response = TMR_FUNCTION_COMPLETE;
		return;
	}
	spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);

out:
	printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %d\n",
			tmr->ref_task_tag);
	tmr->response = TMR_TASK_DOES_NOT_EXIST;
}

static void core_tmr_drain_tmr_list(
	struct se_device *dev,
	struct se_tmr_req *tmr,
	struct list_head *preempt_and_abort_list)
{
	LIST_HEAD(drain_tmr_list);
	struct se_tmr_req *tmr_p, *tmr_pp;
	struct se_cmd *cmd;
	unsigned long flags;
	/*
	 * Release all pending and outgoing TMRs aside from the received
	 * LUN_RESET tmr..
	 */
	spin_lock_irqsave(&dev->se_tmr_lock, flags);
	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_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 (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
			continue;

		spin_lock(&cmd->t_state_lock);
		if (!(cmd->transport_state & CMD_T_ACTIVE)) {
			spin_unlock(&cmd->t_state_lock);
			continue;
		}
		if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
			spin_unlock(&cmd->t_state_lock);
			continue;
		}
		spin_unlock(&cmd->t_state_lock);

		list_move_tail(&tmr_p->tmr_list, &drain_tmr_list);
	}
	spin_unlock_irqrestore(&dev->se_tmr_lock, flags);

	list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) {
		list_del_init(&tmr_p->tmr_list);
		cmd = tmr_p->task_cmd;

		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);

		transport_cmd_finish_abort(cmd, 1);
	}
}

static void core_tmr_drain_state_list(
	struct se_device *dev,
	struct se_cmd *prout_cmd,
	struct se_node_acl *tmr_nacl,
	int tas,
	struct list_head *preempt_and_abort_list)
{
	LIST_HEAD(drain_task_list);
	struct se_cmd *cmd, *next;
	unsigned long flags;
	int fe_count;

	/*
	 * Complete outstanding commands 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(cmd, next, &dev->state_list, state_list) {
		/*
		 * For PREEMPT_AND_ABORT usage, only process commands
		 * with a matching reservation key.
		 */
		if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
			continue;

		/*
		 * Not aborting PROUT PREEMPT_AND_ABORT CDB..
		 */
		if (prout_cmd == cmd)
			continue;

		list_move_tail(&cmd->state_list, &drain_task_list);
		cmd->state_active = false;
	}
	spin_unlock_irqrestore(&dev->execute_task_lock, flags);

	while (!list_empty(&drain_task_list)) {
		cmd = list_entry(drain_task_list.next, struct se_cmd, state_list);
		list_del(&cmd->state_list);

		pr_debug("LUN_RESET: %s cmd: %p"
			" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d"
			"cdb: 0x%02x\n",
			(preempt_and_abort_list) ? "Preempt" : "", cmd,
			cmd->se_tfo->get_task_tag(cmd), 0,
			cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
			cmd->t_task_cdb[0]);
		pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
			" -- CMD_T_ACTIVE: %d"
			" CMD_T_STOP: %d CMD_T_SENT: %d\n",
			cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key,
			(cmd->transport_state & CMD_T_ACTIVE) != 0,
			(cmd->transport_state & CMD_T_STOP) != 0,
			(cmd->transport_state & CMD_T_SENT) != 0);

		/*
		 * If the command may be queued onto a workqueue cancel it now.
		 *
		 * This is equivalent to removal from the execute queue in the
		 * loop above, but we do it down here given that
		 * cancel_work_sync may block.
		 */
		if (cmd->t_state == TRANSPORT_COMPLETE)
			cancel_work_sync(&cmd->work);

		spin_lock_irqsave(&cmd->t_state_lock, flags);
		target_stop_cmd(cmd, &flags);

		fe_count = atomic_read(&cmd->t_fe_count);

		if (!(cmd->transport_state & CMD_T_ACTIVE)) {
			pr_debug("LUN_RESET: got CMD_T_ACTIVE for"
				" cdb: %p, t_fe_count: %d dev: %p\n", cmd,
				fe_count, dev);
			cmd->transport_state |= CMD_T_ABORTED;
			spin_unlock_irqrestore(&cmd->t_state_lock, flags);

			core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
			continue;
		}
		pr_debug("LUN_RESET: Got !CMD_T_ACTIVE for cdb: %p,"
			" t_fe_count: %d dev: %p\n", cmd, fe_count, dev);
		cmd->transport_state |= CMD_T_ABORTED;
		spin_unlock_irqrestore(&cmd->t_state_lock, flags);

		core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
	}
}

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_node_acl *tmr_nacl = NULL;
	struct se_portal_group *tmr_tpg = NULL;
	int 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);

	core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list);
	core_tmr_drain_state_list(dev, prout_cmd, tmr_nacl, tas,
				preempt_and_abort_list);

	/*
	 * 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
c66ac9db NB	27	#include <linux/slab.h>
	28	#include <linux/spinlock.h>
	29	#include <linux/list.h>
c53181af	30	#include <linux/export.h>
c66ac9db NB	31	#include <scsi/scsi.h>
	32	#include <scsi/scsi_cmnd.h>
	33
	34	#include <target/target_core_base.h>
c4795fb2 CH	35	#include <target/target_core_backend.h>
c4795fb2 CH	36	#include <target/target_core_fabric.h>
c66ac9db NB	37	#include <target/target_core_configfs.h>
c66ac9db NB	38
e26d99ae	39	#include "target_core_internal.h"
c66ac9db NB	40	#include "target_core_alua.h"
	41	#include "target_core_pr.h"
	42
c8e31f26	43	int core_tmr_alloc_req(
c66ac9db NB	44	struct se_cmd *se_cmd,
c66ac9db NB	45	void *fabric_tmr_ptr,
dd503a5f RD	46	u8 function,
dd503a5f RD	47	gfp_t gfp_flags)
c66ac9db NB	48	{
	49	struct se_tmr_req *tmr;
	50
c8e31f26	51	tmr = kzalloc(sizeof(struct se_tmr_req), gfp_flags);
6708bb27 AG	52	if (!tmr) {
6708bb27 AG	53	pr_err("Unable to allocate struct se_tmr_req\n");
c8e31f26	54	return -ENOMEM;
c66ac9db	55	}
c8e31f26 AG	56
	57	se_cmd->se_cmd_flags \|= SCF_SCSI_TMR_CDB;
	58	se_cmd->se_tmr_req = tmr;
c66ac9db NB	59	tmr->task_cmd = se_cmd;
	60	tmr->fabric_tmr_ptr = fabric_tmr_ptr;
	61	tmr->function = function;
	62	INIT_LIST_HEAD(&tmr->tmr_list);
	63
c8e31f26	64	return 0;
c66ac9db NB	65	}
	66	EXPORT_SYMBOL(core_tmr_alloc_req);
	67
	68	void core_tmr_release_req(
	69	struct se_tmr_req *tmr)
	70	{
	71	struct se_device *dev = tmr->tmr_dev;
d050ffb9	72	unsigned long flags;
c66ac9db	73
7fd29aa9	74	if (!dev) {
c8e31f26	75	kfree(tmr);
7fd29aa9 NB	76	return;
	77	}
	78
d050ffb9	79	spin_lock_irqsave(&dev->se_tmr_lock, flags);
c66ac9db	80	list_del(&tmr->tmr_list);
d050ffb9	81	spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
7fd29aa9	82
c8e31f26	83	kfree(tmr);
c66ac9db NB	84	}
	85
	86	static void core_tmr_handle_tas_abort(
	87	struct se_node_acl *tmr_nacl,
	88	struct se_cmd *cmd,
	89	int tas,
	90	int fe_count)
	91	{
6708bb27	92	if (!fe_count) {
c66ac9db NB	93	transport_cmd_finish_abort(cmd, 1);
	94	return;
	95	}
	96	/*
	97	* TASK ABORTED status (TAS) bit support
	98	*/
6708bb27	99	if ((tmr_nacl &&
c66ac9db NB	100	(tmr_nacl == cmd->se_sess->se_node_acl)) \|\| tas)
	101	transport_send_task_abort(cmd);
	102
	103	transport_cmd_finish_abort(cmd, 0);
	104	}
	105
feae8564 JE	106	static int target_check_cdb_and_preempt(struct list_head *list,
feae8564 JE	107	struct se_cmd *cmd)
c165f69c	108	{
feae8564	109	struct t10_pr_registration *reg;
c165f69c	110
feae8564 JE	111	if (!list)
	112	return 0;
	113	list_for_each_entry(reg, list, pr_reg_abort_list) {
	114	if (reg->pr_res_key == cmd->pr_res_key)
c165f69c JE	115	return 0;
	116	}
	117
	118	return 1;
	119	}
	120
3d28934a NB	121	void core_tmr_abort_task(
	122	struct se_device *dev,
	123	struct se_tmr_req *tmr,
	124	struct se_session *se_sess)
	125	{
	126	struct se_cmd se_cmd, tmp_cmd;
	127	unsigned long flags;
	128	int ref_tag;
	129
	130	spin_lock_irqsave(&se_sess->sess_cmd_lock, flags);
	131	list_for_each_entry_safe(se_cmd, tmp_cmd,
	132	&se_sess->sess_cmd_list, se_cmd_list) {
	133
	134	if (dev != se_cmd->se_dev)
	135	continue;
	136	ref_tag = se_cmd->se_tfo->get_task_tag(se_cmd);
	137	if (tmr->ref_task_tag != ref_tag)
	138	continue;
	139
	140	printk("ABORT_TASK: Found referenced %s task_tag: %u\n",
	141	se_cmd->se_tfo->get_fabric_name(), ref_tag);
	142
ab74b3d6	143	spin_lock(&se_cmd->t_state_lock);
3d28934a NB	144	if (se_cmd->transport_state & CMD_T_COMPLETE) {
3d28934a NB	145	printk("ABORT_TASK: ref_tag: %u already complete, skipping\n", ref_tag);
ab74b3d6	146	spin_unlock(&se_cmd->t_state_lock);
3d28934a NB	147	spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
	148	goto out;
	149	}
	150	se_cmd->transport_state \|= CMD_T_ABORTED;
ab74b3d6	151	spin_unlock(&se_cmd->t_state_lock);
3d28934a NB	152
	153	list_del_init(&se_cmd->se_cmd_list);
	154	kref_get(&se_cmd->cmd_kref);
	155	spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
	156
	157	cancel_work_sync(&se_cmd->work);
	158	transport_wait_for_tasks(se_cmd);
	159	/*
	160	* Now send SAM_STAT_TASK_ABORTED status for the referenced
	161	* se_cmd descriptor..
	162	*/
	163	transport_send_task_abort(se_cmd);
	164	/*
	165	* Also deal with possible extra acknowledge reference..
	166	*/
	167	if (se_cmd->se_cmd_flags & SCF_ACK_KREF)
	168	target_put_sess_cmd(se_sess, se_cmd);
	169
	170	target_put_sess_cmd(se_sess, se_cmd);
	171
	172	printk("ABORT_TASK: Sending TMR_FUNCTION_COMPLETE for"
	173	" ref_tag: %d\n", ref_tag);
	174	tmr->response = TMR_FUNCTION_COMPLETE;
	175	return;
	176	}
	177	spin_unlock_irqrestore(&se_sess->sess_cmd_lock, flags);
	178
	179	out:
	180	printk("ABORT_TASK: Sending TMR_TASK_DOES_NOT_EXIST for ref_tag: %d\n",
	181	tmr->ref_task_tag);
	182	tmr->response = TMR_TASK_DOES_NOT_EXIST;
	183	}
	184
d050ffb9	185	static void core_tmr_drain_tmr_list(
c66ac9db NB	186	struct se_device *dev,
c66ac9db NB	187	struct se_tmr_req *tmr,
d050ffb9	188	struct list_head *preempt_and_abort_list)
c66ac9db	189	{
d050ffb9	190	LIST_HEAD(drain_tmr_list);
c66ac9db	191	struct se_tmr_req tmr_p, tmr_pp;
d050ffb9	192	struct se_cmd *cmd;
c66ac9db	193	unsigned long flags;
c66ac9db NB	194	/*
	195	* Release all pending and outgoing TMRs aside from the received
	196	* LUN_RESET tmr..
	197	*/
d050ffb9	198	spin_lock_irqsave(&dev->se_tmr_lock, flags);
c66ac9db NB	199	list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
	200	/*
	201	* Allow the received TMR to return with FUNCTION_COMPLETE.
	202	*/
abc1fd4f	203	if (tmr_p == tmr)
c66ac9db NB	204	continue;
	205
	206	cmd = tmr_p->task_cmd;
6708bb27 AG	207	if (!cmd) {
6708bb27 AG	208	pr_err("Unable to locate struct se_cmd for TMR\n");
c66ac9db NB	209	continue;
	210	}
	211	/*
	212	* If this function was called with a valid pr_res_key
	213	* parameter (eg: for PROUT PREEMPT_AND_ABORT service action
	214	* skip non regisration key matching TMRs.
	215	*/
feae8564	216	if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
c66ac9db	217	continue;
c66ac9db	218
d050ffb9	219	spin_lock(&cmd->t_state_lock);
7d680f3b	220	if (!(cmd->transport_state & CMD_T_ACTIVE)) {
d050ffb9	221	spin_unlock(&cmd->t_state_lock);
c66ac9db NB	222	continue;
	223	}
	224	if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
d050ffb9	225	spin_unlock(&cmd->t_state_lock);
c66ac9db NB	226	continue;
c66ac9db NB	227	}
d050ffb9 NB	228	spin_unlock(&cmd->t_state_lock);
d050ffb9 NB	229
6eb40b2a	230	list_move_tail(&tmr_p->tmr_list, &drain_tmr_list);
d050ffb9 NB	231	}
	232	spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
	233
abc1fd4f	234	list_for_each_entry_safe(tmr_p, tmr_pp, &drain_tmr_list, tmr_list) {
b8a11d73	235	list_del_init(&tmr_p->tmr_list);
abc1fd4f	236	cmd = tmr_p->task_cmd;
d050ffb9	237
6708bb27	238	pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
c66ac9db	239	" Response: 0x%02x, t_state: %d\n",
abc1fd4f JE	240	(preempt_and_abort_list) ? "Preempt" : "", tmr_p,
abc1fd4f JE	241	tmr_p->function, tmr_p->response, cmd->t_state);
c66ac9db	242
8dc52b54	243	transport_cmd_finish_abort(cmd, 1);
c66ac9db	244	}
d050ffb9 NB	245	}
d050ffb9 NB	246
cf572a96	247	static void core_tmr_drain_state_list(
d050ffb9 NB	248	struct se_device *dev,
	249	struct se_cmd *prout_cmd,
	250	struct se_node_acl *tmr_nacl,
	251	int tas,
	252	struct list_head *preempt_and_abort_list)
	253	{
	254	LIST_HEAD(drain_task_list);
cf572a96	255	struct se_cmd cmd, next;
d050ffb9 NB	256	unsigned long flags;
d050ffb9 NB	257	int fe_count;
cf572a96	258
c66ac9db	259	/*
cf572a96 CH	260	* Complete outstanding commands with TASK_ABORTED SAM status.
cf572a96 CH	261	*
c66ac9db NB	262	* This is following sam4r17, section 5.6 Aborting commands, Table 38
	263	* for TMR LUN_RESET:
	264	*
	265	* a) "Yes" indicates that each command that is aborted on an I_T nexus
	266	* other than the one that caused the SCSI device condition is
	267	* completed with TASK ABORTED status, if the TAS bit is set to one in
	268	* the Control mode page (see SPC-4). "No" indicates that no status is
	269	* returned for aborted commands.
	270	*
	271	* d) If the logical unit reset is caused by a particular I_T nexus
	272	* (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
	273	* (TASK_ABORTED status) applies.
	274	*
	275	* Otherwise (e.g., if triggered by a hard reset), "no"
	276	* (no TASK_ABORTED SAM status) applies.
	277	*
	278	* Note that this seems to be independent of TAS (Task Aborted Status)
	279	* in the Control Mode Page.
	280	*/
	281	spin_lock_irqsave(&dev->execute_task_lock, flags);
cf572a96	282	list_for_each_entry_safe(cmd, next, &dev->state_list, state_list) {
c66ac9db NB	283	/*
	284	* For PREEMPT_AND_ABORT usage, only process commands
	285	* with a matching reservation key.
	286	*/
feae8564	287	if (target_check_cdb_and_preempt(preempt_and_abort_list, cmd))
c66ac9db	288	continue;
cf572a96	289
c66ac9db NB	290	/*
	291	* Not aborting PROUT PREEMPT_AND_ABORT CDB..
	292	*/
	293	if (prout_cmd == cmd)
	294	continue;
	295
cf572a96 CH	296	list_move_tail(&cmd->state_list, &drain_task_list);
cf572a96 CH	297	cmd->state_active = false;
d050ffb9 NB	298	}
	299	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
	300
	301	while (!list_empty(&drain_task_list)) {
cf572a96 CH	302	cmd = list_entry(drain_task_list.next, struct se_cmd, state_list);
cf572a96 CH	303	list_del(&cmd->state_list);
c66ac9db	304
cf572a96	305	pr_debug("LUN_RESET: %s cmd: %p"
f2da9dbd CH	306	" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state: %d"
f2da9dbd CH	307	"cdb: 0x%02x\n",
cf572a96	308	(preempt_and_abort_list) ? "Preempt" : "", cmd,
e3d6f909 AG	309	cmd->se_tfo->get_task_tag(cmd), 0,
e3d6f909 AG	310	cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
f2da9dbd	311	cmd->t_task_cdb[0]);
6708bb27	312	pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
785fdf70	313	" -- CMD_T_ACTIVE: %d"
7d680f3b	314	" CMD_T_STOP: %d CMD_T_SENT: %d\n",
e3d6f909	315	cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key,
7d680f3b CH	316	(cmd->transport_state & CMD_T_ACTIVE) != 0,
	317	(cmd->transport_state & CMD_T_STOP) != 0,
	318	(cmd->transport_state & CMD_T_SENT) != 0);
c66ac9db	319
35e0e757 CH	320	/*
	321	* If the command may be queued onto a workqueue cancel it now.
	322	*
	323	* This is equivalent to removal from the execute queue in the
	324	* loop above, but we do it down here given that
	325	* cancel_work_sync may block.
	326	*/
	327	if (cmd->t_state == TRANSPORT_COMPLETE)
	328	cancel_work_sync(&cmd->work);
	329
cdbb70bb	330	spin_lock_irqsave(&cmd->t_state_lock, flags);
cf572a96	331	target_stop_cmd(cmd, &flags);
c66ac9db	332
a1d8b49a	333	fe_count = atomic_read(&cmd->t_fe_count);
c66ac9db	334
7d680f3b CH	335	if (!(cmd->transport_state & CMD_T_ACTIVE)) {
7d680f3b CH	336	pr_debug("LUN_RESET: got CMD_T_ACTIVE for"
cf572a96	337	" cdb: %p, t_fe_count: %d dev: %p\n", cmd,
c66ac9db	338	fe_count, dev);
7d680f3b	339	cmd->transport_state \|= CMD_T_ABORTED;
d050ffb9	340	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db	341
d050ffb9	342	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
c66ac9db NB	343	continue;
c66ac9db NB	344	}
cf572a96 CH	345	pr_debug("LUN_RESET: Got !CMD_T_ACTIVE for cdb: %p,"
cf572a96 CH	346	" t_fe_count: %d dev: %p\n", cmd, fe_count, dev);
7d680f3b	347	cmd->transport_state \|= CMD_T_ABORTED;
a1d8b49a	348	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db	349
d050ffb9	350	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
c66ac9db	351	}
d050ffb9 NB	352	}
d050ffb9 NB	353
d050ffb9 NB	354	int core_tmr_lun_reset(
	355	struct se_device *dev,
	356	struct se_tmr_req *tmr,
	357	struct list_head *preempt_and_abort_list,
	358	struct se_cmd *prout_cmd)
	359	{
	360	struct se_node_acl *tmr_nacl = NULL;
	361	struct se_portal_group *tmr_tpg = NULL;
	362	int tas;
	363	/*
	364	* TASK_ABORTED status bit, this is configurable via ConfigFS
	365	* struct se_device attributes. spc4r17 section 7.4.6 Control mode page
	366	*
	367	* A task aborted status (TAS) bit set to zero specifies that aborted
	368	* tasks shall be terminated by the device server without any response
	369	* to the application client. A TAS bit set to one specifies that tasks
	370	* aborted by the actions of an I_T nexus other than the I_T nexus on
	371	* which the command was received shall be completed with TASK ABORTED
	372	* status (see SAM-4).
	373	*/
	374	tas = dev->se_sub_dev->se_dev_attrib.emulate_tas;
	375	/*
	376	* Determine if this se_tmr is coming from a $FABRIC_MOD
	377	* or struct se_device passthrough..
	378	*/
	379	if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
	380	tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
	381	tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
	382	if (tmr_nacl && tmr_tpg) {
	383	pr_debug("LUN_RESET: TMR caller fabric: %s"
	384	" initiator port %s\n",
	385	tmr_tpg->se_tpg_tfo->get_fabric_name(),
	386	tmr_nacl->initiatorname);
	387	}
	388	}
	389	pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
	390	(preempt_and_abort_list) ? "Preempt" : "TMR",
	391	dev->transport->name, tas);
	392
	393	core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list);
cf572a96	394	core_tmr_drain_state_list(dev, prout_cmd, tmr_nacl, tas,
d050ffb9	395	preempt_and_abort_list);
af877292	396
c66ac9db NB	397	/*
	398	* Clear any legacy SPC-2 reservation when called during
	399	* LOGICAL UNIT RESET
	400	*/
6708bb27	401	if (!preempt_and_abort_list &&
c66ac9db NB	402	(dev->dev_flags & DF_SPC2_RESERVATIONS)) {
	403	spin_lock(&dev->dev_reservation_lock);
	404	dev->dev_reserved_node_acl = NULL;
	405	dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
	406	spin_unlock(&dev->dev_reservation_lock);
6708bb27	407	pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
c66ac9db NB	408	}
c66ac9db NB	409
1e7de68c	410	spin_lock_irq(&dev->stats_lock);
c66ac9db	411	dev->num_resets++;
1e7de68c	412	spin_unlock_irq(&dev->stats_lock);
c66ac9db	413
6708bb27	414	pr_debug("LUN_RESET: %s for [%s] Complete\n",
c66ac9db	415	(preempt_and_abort_list) ? "Preempt" : "TMR",
e3d6f909	416	dev->transport->name);
c66ac9db NB	417	return 0;
c66ac9db NB	418	}
d050ffb9	419