[deliverable/linux.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 <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,
	gfp_t gfp_flags)
{
	struct se_tmr_req *tmr;

	tmr = kmem_cache_zalloc(se_tmr_req_cache, gfp_flags);
	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;
	unsigned long flags;

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

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

	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);
}

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 && (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_lock(&cmd->t_state_lock);
		if (!atomic_read(&cmd->t_transport_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->tmr_list, &drain_tmr_list);
	}
	spin_unlock_irqrestore(&dev->se_tmr_lock, flags);

	while (!list_empty(&drain_tmr_list)) {
		tmr = list_entry(drain_tmr_list.next, struct se_tmr_req, tmr_list);
		list_del(&tmr->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,
			tmr->function, tmr->response, cmd->t_state);

		transport_cmd_finish_abort(cmd, 1);
	}
}

static void core_tmr_drain_task_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;
	struct se_task *task, *task_tmp;
	unsigned long flags;
	int fe_count;
	/*
	 * 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_move_tail(&task->t_state_list, &drain_task_list);
		atomic_set(&task->task_state_active, 0);
		/*
		 * Remove from task execute list before processing drain_task_list
		 */
		if (!list_empty(&task->t_execute_list))
			__transport_remove_task_from_execute_queue(task, dev);
	}
	spin_unlock_irqrestore(&dev->execute_task_lock, flags);

	while (!list_empty(&drain_task_list)) {
		task = list_entry(drain_task_list.next, struct se_task, t_state_list);
		list_del(&task->t_state_list);
		cmd = task->task_se_cmd;

		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 (task->task_flags & TF_ACTIVE) {
			task->task_flags |= TF_REQUEST_STOP;
			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);
			task->task_flags &= ~(TF_ACTIVE | TF_REQUEST_STOP);
		}
		__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));
			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);
			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);
	}
}

static void core_tmr_drain_cmd_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_cmd_list);
	struct se_queue_obj *qobj = &dev->dev_queue_obj;
	struct se_cmd *cmd, *tcmd;
	unsigned long 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;
		/*
		 * Skip direct processing of TRANSPORT_FREE_CMD_INTR for
		 * HW target mode fabrics.
		 */
		spin_lock(&cmd->t_state_lock);
		if (cmd->t_state == TRANSPORT_FREE_CMD_INTR) {
			spin_unlock(&cmd->t_state_lock);
			continue;
		}
		spin_unlock(&cmd->t_state_lock);

		atomic_set(&cmd->t_transport_queue_active, 0);
		atomic_dec(&qobj->queue_cnt);
		list_move_tail(&cmd->se_queue_node, &drain_cmd_list);
	}
	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);

	while (!list_empty(&drain_cmd_list)) {
		cmd = list_entry(drain_cmd_list.next, struct se_cmd, se_queue_node);
		list_del_init(&cmd->se_queue_node);

		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));
	}
}

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_task_list(dev, prout_cmd, tmr_nacl, tas,
				preempt_and_abort_list);
	core_tmr_drain_cmd_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>
	30	#include <scsi/scsi.h>
	31	#include <scsi/scsi_cmnd.h>
	32
	33	#include <target/target_core_base.h>
	34	#include <target/target_core_device.h>
	35	#include <target/target_core_tmr.h>
	36	#include <target/target_core_transport.h>
	37	#include <target/target_core_fabric_ops.h>
	38	#include <target/target_core_configfs.h>
	39
	40	#include "target_core_alua.h"
	41	#include "target_core_pr.h"
	42
c66ac9db NB	43	struct se_tmr_req *core_tmr_alloc_req(
	44	struct se_cmd *se_cmd,
	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
dd503a5f	51	tmr = kmem_cache_zalloc(se_tmr_req_cache, gfp_flags);
6708bb27 AG	52	if (!tmr) {
6708bb27 AG	53	pr_err("Unable to allocate struct se_tmr_req\n");
c66ac9db NB	54	return ERR_PTR(-ENOMEM);
	55	}
	56	tmr->task_cmd = se_cmd;
	57	tmr->fabric_tmr_ptr = fabric_tmr_ptr;
	58	tmr->function = function;
	59	INIT_LIST_HEAD(&tmr->tmr_list);
	60
	61	return tmr;
	62	}
	63	EXPORT_SYMBOL(core_tmr_alloc_req);
	64
	65	void core_tmr_release_req(
	66	struct se_tmr_req *tmr)
	67	{
	68	struct se_device *dev = tmr->tmr_dev;
d050ffb9	69	unsigned long flags;
c66ac9db	70
7fd29aa9 NB	71	if (!dev) {
	72	kmem_cache_free(se_tmr_req_cache, tmr);
	73	return;
	74	}
	75
d050ffb9	76	spin_lock_irqsave(&dev->se_tmr_lock, flags);
c66ac9db	77	list_del(&tmr->tmr_list);
d050ffb9	78	spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
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
d050ffb9	103	static void core_tmr_drain_tmr_list(
c66ac9db NB	104	struct se_device *dev,
c66ac9db NB	105	struct se_tmr_req *tmr,
d050ffb9	106	struct list_head *preempt_and_abort_list)
c66ac9db	107	{
d050ffb9	108	LIST_HEAD(drain_tmr_list);
c66ac9db	109	struct se_tmr_req tmr_p, tmr_pp;
d050ffb9	110	struct se_cmd *cmd;
c66ac9db	111	unsigned long flags;
c66ac9db NB	112	/*
	113	* Release all pending and outgoing TMRs aside from the received
	114	* LUN_RESET tmr..
	115	*/
d050ffb9	116	spin_lock_irqsave(&dev->se_tmr_lock, flags);
c66ac9db NB	117	list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
	118	/*
	119	* Allow the received TMR to return with FUNCTION_COMPLETE.
	120	*/
	121	if (tmr && (tmr_p == tmr))
	122	continue;
	123
	124	cmd = tmr_p->task_cmd;
6708bb27 AG	125	if (!cmd) {
6708bb27 AG	126	pr_err("Unable to locate struct se_cmd for TMR\n");
c66ac9db NB	127	continue;
	128	}
	129	/*
	130	* If this function was called with a valid pr_res_key
	131	* parameter (eg: for PROUT PREEMPT_AND_ABORT service action
	132	* skip non regisration key matching TMRs.
	133	*/
6708bb27	134	if (preempt_and_abort_list &&
c66ac9db NB	135	(core_scsi3_check_cdb_abort_and_preempt(
	136	preempt_and_abort_list, cmd) != 0))
	137	continue;
c66ac9db	138
d050ffb9	139	spin_lock(&cmd->t_state_lock);
6708bb27	140	if (!atomic_read(&cmd->t_transport_active)) {
d050ffb9	141	spin_unlock(&cmd->t_state_lock);
c66ac9db NB	142	continue;
	143	}
	144	if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
d050ffb9	145	spin_unlock(&cmd->t_state_lock);
c66ac9db NB	146	continue;
c66ac9db NB	147	}
d050ffb9 NB	148	spin_unlock(&cmd->t_state_lock);
	149
	150	list_move_tail(&tmr->tmr_list, &drain_tmr_list);
	151	}
	152	spin_unlock_irqrestore(&dev->se_tmr_lock, flags);
	153
	154	while (!list_empty(&drain_tmr_list)) {
	155	tmr = list_entry(drain_tmr_list.next, struct se_tmr_req, tmr_list);
	156	list_del(&tmr->tmr_list);
	157	cmd = tmr_p->task_cmd;
	158
6708bb27	159	pr_debug("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
c66ac9db	160	" Response: 0x%02x, t_state: %d\n",
d050ffb9 NB	161	(preempt_and_abort_list) ? "Preempt" : "", tmr,
d050ffb9 NB	162	tmr->function, tmr->response, cmd->t_state);
c66ac9db	163
8dc52b54	164	transport_cmd_finish_abort(cmd, 1);
c66ac9db	165	}
d050ffb9 NB	166	}
	167
	168	static void core_tmr_drain_task_list(
	169	struct se_device *dev,
	170	struct se_cmd *prout_cmd,
	171	struct se_node_acl *tmr_nacl,
	172	int tas,
	173	struct list_head *preempt_and_abort_list)
	174	{
	175	LIST_HEAD(drain_task_list);
	176	struct se_cmd *cmd;
	177	struct se_task task, task_tmp;
	178	unsigned long flags;
	179	int fe_count;
c66ac9db NB	180	/*
	181	* Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status.
	182	* This is following sam4r17, section 5.6 Aborting commands, Table 38
	183	* for TMR LUN_RESET:
	184	*
	185	* a) "Yes" indicates that each command that is aborted on an I_T nexus
	186	* other than the one that caused the SCSI device condition is
	187	* completed with TASK ABORTED status, if the TAS bit is set to one in
	188	* the Control mode page (see SPC-4). "No" indicates that no status is
	189	* returned for aborted commands.
	190	*
	191	* d) If the logical unit reset is caused by a particular I_T nexus
	192	* (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
	193	* (TASK_ABORTED status) applies.
	194	*
	195	* Otherwise (e.g., if triggered by a hard reset), "no"
	196	* (no TASK_ABORTED SAM status) applies.
	197	*
	198	* Note that this seems to be independent of TAS (Task Aborted Status)
	199	* in the Control Mode Page.
	200	*/
	201	spin_lock_irqsave(&dev->execute_task_lock, flags);
	202	list_for_each_entry_safe(task, task_tmp, &dev->state_task_list,
	203	t_state_list) {
e3d6f909	204	if (!task->task_se_cmd) {
6708bb27	205	pr_err("task->task_se_cmd is NULL!\n");
c66ac9db NB	206	continue;
c66ac9db NB	207	}
e3d6f909	208	cmd = task->task_se_cmd;
c66ac9db	209
c66ac9db NB	210	/*
	211	* For PREEMPT_AND_ABORT usage, only process commands
	212	* with a matching reservation key.
	213	*/
6708bb27	214	if (preempt_and_abort_list &&
c66ac9db NB	215	(core_scsi3_check_cdb_abort_and_preempt(
	216	preempt_and_abort_list, cmd) != 0))
	217	continue;
	218	/*
	219	* Not aborting PROUT PREEMPT_AND_ABORT CDB..
	220	*/
	221	if (prout_cmd == cmd)
	222	continue;
	223
d050ffb9	224	list_move_tail(&task->t_state_list, &drain_task_list);
c66ac9db	225	atomic_set(&task->task_state_active, 0);
d050ffb9 NB	226	/*
	227	* Remove from task execute list before processing drain_task_list
	228	*/
04629b7b CH	229	if (!list_empty(&task->t_execute_list))
04629b7b CH	230	__transport_remove_task_from_execute_queue(task, dev);
d050ffb9 NB	231	}
	232	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
	233
	234	while (!list_empty(&drain_task_list)) {
	235	task = list_entry(drain_task_list.next, struct se_task, t_state_list);
	236	list_del(&task->t_state_list);
	237	cmd = task->task_se_cmd;
c66ac9db	238
a1d8b49a	239	spin_lock_irqsave(&cmd->t_state_lock, flags);
6708bb27	240	pr_debug("LUN_RESET: %s cmd: %p task: %p"
c66ac9db NB	241	" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state/"
	242	"def_t_state: %d/%d cdb: 0x%02x\n",
	243	(preempt_and_abort_list) ? "Preempt" : "", cmd, task,
e3d6f909 AG	244	cmd->se_tfo->get_task_tag(cmd), 0,
e3d6f909 AG	245	cmd->se_tfo->get_cmd_state(cmd), cmd->t_state,
a1d8b49a	246	cmd->deferred_t_state, cmd->t_task_cdb[0]);
6708bb27	247	pr_debug("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
c66ac9db NB	248	" t_task_cdbs: %d t_task_cdbs_left: %d"
	249	" t_task_cdbs_sent: %d -- t_transport_active: %d"
	250	" t_transport_stop: %d t_transport_sent: %d\n",
e3d6f909	251	cmd->se_tfo->get_task_tag(cmd), cmd->pr_res_key,
a1d8b49a AG	252	cmd->t_task_list_num,
	253	atomic_read(&cmd->t_task_cdbs_left),
	254	atomic_read(&cmd->t_task_cdbs_sent),
	255	atomic_read(&cmd->t_transport_active),
	256	atomic_read(&cmd->t_transport_stop),
	257	atomic_read(&cmd->t_transport_sent));
c66ac9db	258
6c76bf95 CH	259	if (task->task_flags & TF_ACTIVE) {
6c76bf95 CH	260	task->task_flags \|= TF_REQUEST_STOP;
c66ac9db	261	spin_unlock_irqrestore(
a1d8b49a	262	&cmd->t_state_lock, flags);
c66ac9db	263
6708bb27	264	pr_debug("LUN_RESET: Waiting for task: %p to shutdown"
c66ac9db NB	265	" for dev: %p\n", task, dev);
c66ac9db NB	266	wait_for_completion(&task->task_stop_comp);
6708bb27	267	pr_debug("LUN_RESET Completed task: %p shutdown for"
c66ac9db	268	" dev: %p\n", task, dev);
6c76bf95	269
a1d8b49a AG	270	spin_lock_irqsave(&cmd->t_state_lock, flags);
a1d8b49a AG	271	atomic_dec(&cmd->t_task_cdbs_left);
6c76bf95	272	task->task_flags &= ~(TF_ACTIVE \| TF_REQUEST_STOP);
c66ac9db NB	273	}
	274	__transport_stop_task_timer(task, &flags);
	275
6708bb27	276	if (!atomic_dec_and_test(&cmd->t_task_cdbs_ex_left)) {
d050ffb9	277	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
6708bb27	278	pr_debug("LUN_RESET: Skipping task: %p, dev: %p for"
c66ac9db	279	" t_task_cdbs_ex_left: %d\n", task, dev,
a1d8b49a	280	atomic_read(&cmd->t_task_cdbs_ex_left));
c66ac9db NB	281	continue;
c66ac9db NB	282	}
a1d8b49a	283	fe_count = atomic_read(&cmd->t_fe_count);
c66ac9db	284
a1d8b49a	285	if (atomic_read(&cmd->t_transport_active)) {
6708bb27	286	pr_debug("LUN_RESET: got t_transport_active = 1 for"
c66ac9db NB	287	" task: %p, t_fe_count: %d dev: %p\n", task,
c66ac9db NB	288	fe_count, dev);
a1d8b49a	289	atomic_set(&cmd->t_transport_aborted, 1);
d050ffb9	290	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db	291
d050ffb9	292	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
c66ac9db NB	293	continue;
c66ac9db NB	294	}
6708bb27	295	pr_debug("LUN_RESET: Got t_transport_active = 0 for task: %p,"
c66ac9db	296	" t_fe_count: %d dev: %p\n", task, fe_count, dev);
a1d8b49a AG	297	atomic_set(&cmd->t_transport_aborted, 1);
a1d8b49a AG	298	spin_unlock_irqrestore(&cmd->t_state_lock, flags);
c66ac9db	299
d050ffb9	300	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
c66ac9db	301	}
d050ffb9 NB	302	}
	303
	304	static void core_tmr_drain_cmd_list(
	305	struct se_device *dev,
	306	struct se_cmd *prout_cmd,
	307	struct se_node_acl *tmr_nacl,
	308	int tas,
	309	struct list_head *preempt_and_abort_list)
	310	{
	311	LIST_HEAD(drain_cmd_list);
	312	struct se_queue_obj *qobj = &dev->dev_queue_obj;
	313	struct se_cmd cmd, tcmd;
	314	unsigned long flags;
c66ac9db NB	315	/*
	316	* Release all commands remaining in the struct se_device cmd queue.
	317	*
	318	* This follows the same logic as above for the struct se_device
	319	* struct se_task state list, where commands are returned with
	320	* TASK_ABORTED status, if there is an outstanding $FABRIC_MOD
	321	* reference, otherwise the struct se_cmd is released.
	322	*/
	323	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
5951146d	324	list_for_each_entry_safe(cmd, tcmd, &qobj->qobj_list, se_queue_node) {
c66ac9db NB	325	/*
	326	* For PREEMPT_AND_ABORT usage, only process commands
	327	* with a matching reservation key.
	328	*/
6708bb27	329	if (preempt_and_abort_list &&
c66ac9db NB	330	(core_scsi3_check_cdb_abort_and_preempt(
	331	preempt_and_abort_list, cmd) != 0))
	332	continue;
	333	/*
	334	* Not aborting PROUT PREEMPT_AND_ABORT CDB..
	335	*/
	336	if (prout_cmd == cmd)
	337	continue;
b0e062ae NB	338	/*
	339	* Skip direct processing of TRANSPORT_FREE_CMD_INTR for
	340	* HW target mode fabrics.
	341	*/
	342	spin_lock(&cmd->t_state_lock);
	343	if (cmd->t_state == TRANSPORT_FREE_CMD_INTR) {
	344	spin_unlock(&cmd->t_state_lock);
	345	continue;
	346	}
	347	spin_unlock(&cmd->t_state_lock);
c66ac9db	348
d050ffb9	349	atomic_set(&cmd->t_transport_queue_active, 0);
c66ac9db	350	atomic_dec(&qobj->queue_cnt);
d050ffb9 NB	351	list_move_tail(&cmd->se_queue_node, &drain_cmd_list);
	352	}
	353	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
	354
	355	while (!list_empty(&drain_cmd_list)) {
	356	cmd = list_entry(drain_cmd_list.next, struct se_cmd, se_queue_node);
79a7fef2	357	list_del_init(&cmd->se_queue_node);
c66ac9db	358
6708bb27	359	pr_debug("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
c66ac9db	360	" %d t_fe_count: %d\n", (preempt_and_abort_list) ?
5951146d	361	"Preempt" : "", cmd, cmd->t_state,
a1d8b49a	362	atomic_read(&cmd->t_fe_count));
c66ac9db NB	363	/*
c66ac9db NB	364	* Signal that the command has failed via cmd->se_cmd_flags,
c66ac9db NB	365	*/
	366	transport_new_cmd_failure(cmd);
	367
	368	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas,
a1d8b49a	369	atomic_read(&cmd->t_fe_count));
c66ac9db	370	}
d050ffb9 NB	371	}
	372
	373	int core_tmr_lun_reset(
	374	struct se_device *dev,
	375	struct se_tmr_req *tmr,
	376	struct list_head *preempt_and_abort_list,
	377	struct se_cmd *prout_cmd)
	378	{
	379	struct se_node_acl *tmr_nacl = NULL;
	380	struct se_portal_group *tmr_tpg = NULL;
	381	int tas;
	382	/*
	383	* TASK_ABORTED status bit, this is configurable via ConfigFS
	384	* struct se_device attributes. spc4r17 section 7.4.6 Control mode page
	385	*
	386	* A task aborted status (TAS) bit set to zero specifies that aborted
	387	* tasks shall be terminated by the device server without any response
	388	* to the application client. A TAS bit set to one specifies that tasks
	389	* aborted by the actions of an I_T nexus other than the I_T nexus on
	390	* which the command was received shall be completed with TASK ABORTED
	391	* status (see SAM-4).
	392	*/
	393	tas = dev->se_sub_dev->se_dev_attrib.emulate_tas;
	394	/*
	395	* Determine if this se_tmr is coming from a $FABRIC_MOD
	396	* or struct se_device passthrough..
	397	*/
	398	if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
	399	tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
	400	tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
	401	if (tmr_nacl && tmr_tpg) {
	402	pr_debug("LUN_RESET: TMR caller fabric: %s"
	403	" initiator port %s\n",
	404	tmr_tpg->se_tpg_tfo->get_fabric_name(),
	405	tmr_nacl->initiatorname);
	406	}
	407	}
	408	pr_debug("LUN_RESET: %s starting for [%s], tas: %d\n",
	409	(preempt_and_abort_list) ? "Preempt" : "TMR",
	410	dev->transport->name, tas);
	411
	412	core_tmr_drain_tmr_list(dev, tmr, preempt_and_abort_list);
	413	core_tmr_drain_task_list(dev, prout_cmd, tmr_nacl, tas,
	414	preempt_and_abort_list);
	415	core_tmr_drain_cmd_list(dev, prout_cmd, tmr_nacl, tas,
	416	preempt_and_abort_list);
c66ac9db NB	417	/*
	418	* Clear any legacy SPC-2 reservation when called during
	419	* LOGICAL UNIT RESET
	420	*/
6708bb27	421	if (!preempt_and_abort_list &&
c66ac9db NB	422	(dev->dev_flags & DF_SPC2_RESERVATIONS)) {
	423	spin_lock(&dev->dev_reservation_lock);
	424	dev->dev_reserved_node_acl = NULL;
	425	dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
	426	spin_unlock(&dev->dev_reservation_lock);
6708bb27	427	pr_debug("LUN_RESET: SCSI-2 Released reservation\n");
c66ac9db NB	428	}
c66ac9db NB	429
1e7de68c	430	spin_lock_irq(&dev->stats_lock);
c66ac9db	431	dev->num_resets++;
1e7de68c	432	spin_unlock_irq(&dev->stats_lock);
c66ac9db	433
6708bb27	434	pr_debug("LUN_RESET: %s for [%s] Complete\n",
c66ac9db	435	(preempt_and_abort_list) ? "Preempt" : "TMR",
e3d6f909	436	dev->transport->name);
c66ac9db NB	437	return 0;
c66ac9db NB	438	}
d050ffb9	439