[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;

	spin_lock(&dev->se_tmr_lock);
	list_del(&tmr->tmr_list);
	kmem_cache_free(se_tmr_req_cache, tmr);
	spin_unlock(&dev->se_tmr_lock);
}

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;
	struct se_queue_req *qr, *qr_tmp;
	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, state, 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_ATTRIB(dev)->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",
				TPG_TFO(tmr_tpg)->get_fabric_name(),
				tmr_nacl->initiatorname);
		}
	}
	DEBUG_LR("LUN_RESET: %s starting for [%s], tas: %d\n",
		(preempt_and_abort_list) ? "Preempt" : "TMR",
		TRANSPORT(dev)->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(&T_TASK(cmd)->t_state_lock, flags);
		if (!(atomic_read(&T_TASK(cmd)->t_transport_active))) {
			spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
			spin_lock(&dev->se_tmr_lock);
			continue;
		}
		if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
			spin_unlock_irqrestore(&T_TASK(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(&T_TASK(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_CMD(task))) {
			printk(KERN_ERR "TASK_CMD(task) is NULL!\n");
			continue;
		}
		cmd = TASK_CMD(task);

		if (!T_TASK(cmd)) {
			printk(KERN_ERR "T_TASK(cmd) is NULL for task: %p cmd:"
				" %p ITT: 0x%08x\n", task, cmd,
				CMD_TFO(cmd)->get_task_tag(cmd));
			continue;
		}
		/*
		 * 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(&T_TASK(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_TFO(cmd)->get_task_tag(cmd), 0,
			CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state,
			cmd->deferred_t_state, T_TASK(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_TFO(cmd)->get_task_tag(cmd), cmd->pr_res_key,
			T_TASK(cmd)->t_task_cdbs,
			atomic_read(&T_TASK(cmd)->t_task_cdbs_left),
			atomic_read(&T_TASK(cmd)->t_task_cdbs_sent),
			atomic_read(&T_TASK(cmd)->t_transport_active),
			atomic_read(&T_TASK(cmd)->t_transport_stop),
			atomic_read(&T_TASK(cmd)->t_transport_sent));

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

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

		if (atomic_read(&T_TASK(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(&T_TASK(cmd)->t_transport_aborted, 1);
			spin_unlock_irqrestore(&T_TASK(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(&T_TASK(cmd)->t_transport_aborted, 1);
		spin_unlock_irqrestore(&T_TASK(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(qr, qr_tmp, &qobj->qobj_list, qr_list) {
		cmd = (struct se_cmd *)qr->cmd;
		if (!(cmd)) {
			/*
			 * Skip these for non PREEMPT_AND_ABORT usage..
			 */
			if (preempt_and_abort_list != NULL)
				continue;

			atomic_dec(&qobj->queue_cnt);
			list_del(&qr->qr_list);
			kfree(qr);
			continue;
		}
		/*
		 * 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(&T_TASK(cmd)->t_transport_queue_active);
		atomic_dec(&qobj->queue_cnt);
		list_del(&qr->qr_list);
		spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);

		state = qr->state;
		kfree(qr);

		DEBUG_LR("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
			" %d t_fe_count: %d\n", (preempt_and_abort_list) ?
			"Preempt" : "", cmd, state,
			atomic_read(&T_TASK(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(&T_TASK(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",
			TRANSPORT(dev)->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
	78	spin_lock(&dev->se_tmr_lock);
	79	list_del(&tmr->tmr_list);
	80	kmem_cache_free(se_tmr_req_cache, tmr);
	81	spin_unlock(&dev->se_tmr_lock);
	82	}
	83
	84	static void core_tmr_handle_tas_abort(
	85	struct se_node_acl *tmr_nacl,
	86	struct se_cmd *cmd,
	87	int tas,
	88	int fe_count)
	89	{
	90	if (!(fe_count)) {
	91	transport_cmd_finish_abort(cmd, 1);
	92	return;
	93	}
	94	/*
	95	* TASK ABORTED status (TAS) bit support
	96	*/
	97	if (((tmr_nacl != NULL) &&
	98	(tmr_nacl == cmd->se_sess->se_node_acl)) \|\| tas)
	99	transport_send_task_abort(cmd);
	100
	101	transport_cmd_finish_abort(cmd, 0);
	102	}
	103
	104	int core_tmr_lun_reset(
	105	struct se_device *dev,
	106	struct se_tmr_req *tmr,
	107	struct list_head *preempt_and_abort_list,
	108	struct se_cmd *prout_cmd)
	109	{
	110	struct se_cmd *cmd;
	111	struct se_queue_req qr, qr_tmp;
	112	struct se_node_acl *tmr_nacl = NULL;
	113	struct se_portal_group *tmr_tpg = NULL;
	114	struct se_queue_obj *qobj = dev->dev_queue_obj;
	115	struct se_tmr_req tmr_p, tmr_pp;
	116	struct se_task task, task_tmp;
	117	unsigned long flags;
	118	int fe_count, state, tas;
	119	/*
	120	* TASK_ABORTED status bit, this is configurable via ConfigFS
	121	* struct se_device attributes. spc4r17 section 7.4.6 Control mode page
	122	*
	123	* A task aborted status (TAS) bit set to zero specifies that aborted
124	* tasks shall be terminated by the device server without any response
125	* to the application client. A TAS bit set to one specifies that tasks
126	* aborted by the actions of an I_T nexus other than the I_T nexus on
127	* which the command was received shall be completed with TASK ABORTED
128	* status (see SAM-4).
129	*/
130	tas = DEV_ATTRIB(dev)->emulate_tas;
131	/*
132	* Determine if this se_tmr is coming from a $FABRIC_MOD
133	* or struct se_device passthrough..
134	*/
135	if (tmr && tmr->task_cmd && tmr->task_cmd->se_sess) {
136	tmr_nacl = tmr->task_cmd->se_sess->se_node_acl;
137	tmr_tpg = tmr->task_cmd->se_sess->se_tpg;
138	if (tmr_nacl && tmr_tpg) {
139	DEBUG_LR("LUN_RESET: TMR caller fabric: %s"
140	" initiator port %s\n",
141	TPG_TFO(tmr_tpg)->get_fabric_name(),
142	tmr_nacl->initiatorname);
143	}
144	}
145	DEBUG_LR("LUN_RESET: %s starting for [%s], tas: %d\n",
146	(preempt_and_abort_list) ? "Preempt" : "TMR",
147	TRANSPORT(dev)->name, tas);
148	/*
149	* Release all pending and outgoing TMRs aside from the received
150	* LUN_RESET tmr..
151	*/
152	spin_lock(&dev->se_tmr_lock);
153	list_for_each_entry_safe(tmr_p, tmr_pp, &dev->dev_tmr_list, tmr_list) {
154	/*
155	* Allow the received TMR to return with FUNCTION_COMPLETE.
156	*/
157	if (tmr && (tmr_p == tmr))
158	continue;
159
160	cmd = tmr_p->task_cmd;
161	if (!(cmd)) {
162	printk(KERN_ERR "Unable to locate struct se_cmd for TMR\n");
163	continue;
164	}
165	/*
166	* If this function was called with a valid pr_res_key
167	* parameter (eg: for PROUT PREEMPT_AND_ABORT service action
168	* skip non regisration key matching TMRs.
169	*/
170	if ((preempt_and_abort_list != NULL) &&
171	(core_scsi3_check_cdb_abort_and_preempt(
172	preempt_and_abort_list, cmd) != 0))
173	continue;
174	spin_unlock(&dev->se_tmr_lock);
175
176	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
177	if (!(atomic_read(&T_TASK(cmd)->t_transport_active))) {
178	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
179	spin_lock(&dev->se_tmr_lock);
180	continue;
181	}
182	if (cmd->t_state == TRANSPORT_ISTATE_PROCESSING) {
183	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
184	spin_lock(&dev->se_tmr_lock);
185	continue;
186	}
187	DEBUG_LR("LUN_RESET: %s releasing TMR %p Function: 0x%02x,"
188	" Response: 0x%02x, t_state: %d\n",
189	(preempt_and_abort_list) ? "Preempt" : "", tmr_p,
190	tmr_p->function, tmr_p->response, cmd->t_state);
191	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
192
193	transport_cmd_finish_abort_tmr(cmd);
194	spin_lock(&dev->se_tmr_lock);
195	}
196	spin_unlock(&dev->se_tmr_lock);
197	/*
198	* Complete outstanding struct se_task CDBs with TASK_ABORTED SAM status.
199	* This is following sam4r17, section 5.6 Aborting commands, Table 38
200	* for TMR LUN_RESET:
201	*
202	* a) "Yes" indicates that each command that is aborted on an I_T nexus
203	* other than the one that caused the SCSI device condition is
204	* completed with TASK ABORTED status, if the TAS bit is set to one in
205	* the Control mode page (see SPC-4). "No" indicates that no status is
206	* returned for aborted commands.
207	*
208	* d) If the logical unit reset is caused by a particular I_T nexus
209	* (e.g., by a LOGICAL UNIT RESET task management function), then "yes"
210	* (TASK_ABORTED status) applies.
211	*
212	* Otherwise (e.g., if triggered by a hard reset), "no"
213	* (no TASK_ABORTED SAM status) applies.
214	*
215	* Note that this seems to be independent of TAS (Task Aborted Status)
216	* in the Control Mode Page.
217	*/
218	spin_lock_irqsave(&dev->execute_task_lock, flags);
219	list_for_each_entry_safe(task, task_tmp, &dev->state_task_list,
220	t_state_list) {
221	if (!(TASK_CMD(task))) {
222	printk(KERN_ERR "TASK_CMD(task) is NULL!\n");
223	continue;
224	}
225	cmd = TASK_CMD(task);
226
227	if (!T_TASK(cmd)) {
228	printk(KERN_ERR "T_TASK(cmd) is NULL for task: %p cmd:"
229	" %p ITT: 0x%08x\n", task, cmd,
230	CMD_TFO(cmd)->get_task_tag(cmd));
231	continue;
232	}
233	/*
234	* For PREEMPT_AND_ABORT usage, only process commands
235	* with a matching reservation key.
236	*/
237	if ((preempt_and_abort_list != NULL) &&
238	(core_scsi3_check_cdb_abort_and_preempt(
239	preempt_and_abort_list, cmd) != 0))
240	continue;
241	/*
242	* Not aborting PROUT PREEMPT_AND_ABORT CDB..
243	*/
244	if (prout_cmd == cmd)
245	continue;
246
247	list_del(&task->t_state_list);
248	atomic_set(&task->task_state_active, 0);
249	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
250
251	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
252	DEBUG_LR("LUN_RESET: %s cmd: %p task: %p"
253	" ITT/CmdSN: 0x%08x/0x%08x, i_state: %d, t_state/"
254	"def_t_state: %d/%d cdb: 0x%02x\n",
255	(preempt_and_abort_list) ? "Preempt" : "", cmd, task,
256	CMD_TFO(cmd)->get_task_tag(cmd), 0,
257	CMD_TFO(cmd)->get_cmd_state(cmd), cmd->t_state,
258	cmd->deferred_t_state, T_TASK(cmd)->t_task_cdb[0]);
259	DEBUG_LR("LUN_RESET: ITT[0x%08x] - pr_res_key: 0x%016Lx"
260	" t_task_cdbs: %d t_task_cdbs_left: %d"
261	" t_task_cdbs_sent: %d -- t_transport_active: %d"
262	" t_transport_stop: %d t_transport_sent: %d\n",
263	CMD_TFO(cmd)->get_task_tag(cmd), cmd->pr_res_key,
264	T_TASK(cmd)->t_task_cdbs,
265	atomic_read(&T_TASK(cmd)->t_task_cdbs_left),
266	atomic_read(&T_TASK(cmd)->t_task_cdbs_sent),
267	atomic_read(&T_TASK(cmd)->t_transport_active),
268	atomic_read(&T_TASK(cmd)->t_transport_stop),
269	atomic_read(&T_TASK(cmd)->t_transport_sent));
270
271	if (atomic_read(&task->task_active)) {
272	atomic_set(&task->task_stop, 1);
273	spin_unlock_irqrestore(
274	&T_TASK(cmd)->t_state_lock, flags);
275
276	DEBUG_LR("LUN_RESET: Waiting for task: %p to shutdown"
277	" for dev: %p\n", task, dev);
278	wait_for_completion(&task->task_stop_comp);
279	DEBUG_LR("LUN_RESET Completed task: %p shutdown for"
280	" dev: %p\n", task, dev);
281	spin_lock_irqsave(&T_TASK(cmd)->t_state_lock, flags);
282	atomic_dec(&T_TASK(cmd)->t_task_cdbs_left);
283
284	atomic_set(&task->task_active, 0);
285	atomic_set(&task->task_stop, 0);
52208ae3 NB	286	} else {
	287	if (atomic_read(&task->task_execute_queue) != 0)
	288	transport_remove_task_from_execute_queue(task, dev);
c66ac9db NB	289	}
	290	__transport_stop_task_timer(task, &flags);
	291
	292	if (!(atomic_dec_and_test(&T_TASK(cmd)->t_task_cdbs_ex_left))) {
	293	spin_unlock_irqrestore(
	294	&T_TASK(cmd)->t_state_lock, flags);
	295	DEBUG_LR("LUN_RESET: Skipping task: %p, dev: %p for"
	296	" t_task_cdbs_ex_left: %d\n", task, dev,
	297	atomic_read(&T_TASK(cmd)->t_task_cdbs_ex_left));
	298
	299	spin_lock_irqsave(&dev->execute_task_lock, flags);
	300	continue;
	301	}
	302	fe_count = atomic_read(&T_TASK(cmd)->t_fe_count);
	303
	304	if (atomic_read(&T_TASK(cmd)->t_transport_active)) {
	305	DEBUG_LR("LUN_RESET: got t_transport_active = 1 for"
	306	" task: %p, t_fe_count: %d dev: %p\n", task,
	307	fe_count, dev);
52208ae3	308	atomic_set(&T_TASK(cmd)->t_transport_aborted, 1);
c66ac9db NB	309	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock,
	310	flags);
	311	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
	312
	313	spin_lock_irqsave(&dev->execute_task_lock, flags);
	314	continue;
	315	}
	316	DEBUG_LR("LUN_RESET: Got t_transport_active = 0 for task: %p,"
	317	" t_fe_count: %d dev: %p\n", task, fe_count, dev);
52208ae3	318	atomic_set(&T_TASK(cmd)->t_transport_aborted, 1);
c66ac9db NB	319	spin_unlock_irqrestore(&T_TASK(cmd)->t_state_lock, flags);
	320	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas, fe_count);
	321
	322	spin_lock_irqsave(&dev->execute_task_lock, flags);
	323	}
	324	spin_unlock_irqrestore(&dev->execute_task_lock, flags);
	325	/*
	326	* Release all commands remaining in the struct se_device cmd queue.
	327	*
	328	* This follows the same logic as above for the struct se_device
	329	* struct se_task state list, where commands are returned with
	330	* TASK_ABORTED status, if there is an outstanding $FABRIC_MOD
	331	* reference, otherwise the struct se_cmd is released.
	332	*/
	333	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
	334	list_for_each_entry_safe(qr, qr_tmp, &qobj->qobj_list, qr_list) {
	335	cmd = (struct se_cmd *)qr->cmd;
	336	if (!(cmd)) {
	337	/*
	338	* Skip these for non PREEMPT_AND_ABORT usage..
	339	*/
	340	if (preempt_and_abort_list != NULL)
	341	continue;
	342
	343	atomic_dec(&qobj->queue_cnt);
	344	list_del(&qr->qr_list);
	345	kfree(qr);
	346	continue;
	347	}
	348	/*
	349	* For PREEMPT_AND_ABORT usage, only process commands
	350	* with a matching reservation key.
	351	*/
	352	if ((preempt_and_abort_list != NULL) &&
	353	(core_scsi3_check_cdb_abort_and_preempt(
	354	preempt_and_abort_list, cmd) != 0))
	355	continue;
	356	/*
	357	* Not aborting PROUT PREEMPT_AND_ABORT CDB..
	358	*/
	359	if (prout_cmd == cmd)
	360	continue;
	361
	362	atomic_dec(&T_TASK(cmd)->t_transport_queue_active);
	363	atomic_dec(&qobj->queue_cnt);
	364	list_del(&qr->qr_list);
	365	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
	366
	367	state = qr->state;
	368	kfree(qr);
	369
	370	DEBUG_LR("LUN_RESET: %s from Device Queue: cmd: %p t_state:"
	371	" %d t_fe_count: %d\n", (preempt_and_abort_list) ?
	372	"Preempt" : "", cmd, state,
	373	atomic_read(&T_TASK(cmd)->t_fe_count));
	374	/*
	375	* Signal that the command has failed via cmd->se_cmd_flags,
	376	* and call TFO->new_cmd_failure() to wakeup any fabric
	377	* dependent code used to wait for unsolicited data out
	378	* allocation to complete. The fabric module is expected
	379	* to dump any remaining unsolicited data out for the aborted
	380	* command at this point.
	381	*/
	382	transport_new_cmd_failure(cmd);
383
384	core_tmr_handle_tas_abort(tmr_nacl, cmd, tas,
385	atomic_read(&T_TASK(cmd)->t_fe_count));
386	spin_lock_irqsave(&qobj->cmd_queue_lock, flags);
387	}
388	spin_unlock_irqrestore(&qobj->cmd_queue_lock, flags);
389	/*
390	* Clear any legacy SPC-2 reservation when called during
391	* LOGICAL UNIT RESET
392	*/
393	if (!(preempt_and_abort_list) &&
394	(dev->dev_flags & DF_SPC2_RESERVATIONS)) {
395	spin_lock(&dev->dev_reservation_lock);
396	dev->dev_reserved_node_acl = NULL;
397	dev->dev_flags &= ~DF_SPC2_RESERVATIONS;
398	spin_unlock(&dev->dev_reservation_lock);
399	printk(KERN_INFO "LUN_RESET: SCSI-2 Released reservation\n");
400	}
401
1e7de68c	402	spin_lock_irq(&dev->stats_lock);
c66ac9db	403	dev->num_resets++;
1e7de68c	404	spin_unlock_irq(&dev->stats_lock);
c66ac9db NB	405
	406	DEBUG_LR("LUN_RESET: %s for [%s] Complete\n",
	407	(preempt_and_abort_list) ? "Preempt" : "TMR",
	408	TRANSPORT(dev)->name);
	409	return 0;
	410	}