[deliverable/linux.git] / drivers / net / wireless / intel / iwlwifi / iwl-notif-wait.c

/******************************************************************************
 *
 * This file is provided under a dual BSD/GPLv2 license.  When using or
 * redistributing this file, you may do so under either license.
 *
 * GPL LICENSE SUMMARY
 *
 * Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
 * Copyright(c) 2015 Intel Deutschland GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
 * USA
 *
 * The full GNU General Public License is included in this distribution
 * in the file called COPYING.
 *
 * Contact Information:
 *  Intel Linux Wireless <linuxwifi@intel.com>
 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
 *
 * BSD LICENSE
 *
 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *  * Neither the name Intel Corporation nor the names of its
 *    contributors may be used to endorse or promote products derived
 *    from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *****************************************************************************/
#include <linux/sched.h>
#include <linux/export.h>

#include "iwl-drv.h"
#include "iwl-notif-wait.h"


void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
{
	spin_lock_init(&notif_wait->notif_wait_lock);
	INIT_LIST_HEAD(&notif_wait->notif_waits);
	init_waitqueue_head(&notif_wait->notif_waitq);
}
IWL_EXPORT_SYMBOL(iwl_notification_wait_init);

void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_wait,
				  struct iwl_rx_packet *pkt)
{
	bool triggered = false;

	if (!list_empty(&notif_wait->notif_waits)) {
		struct iwl_notification_wait *w;

		spin_lock(&notif_wait->notif_wait_lock);
		list_for_each_entry(w, &notif_wait->notif_waits, list) {
			int i;
			bool found = false;

			/*
			 * If it already finished (triggered) or has been
			 * aborted then don't evaluate it again to avoid races,
			 * Otherwise the function could be called again even
			 * though it returned true before
			 */
			if (w->triggered || w->aborted)
				continue;

			for (i = 0; i < w->n_cmds; i++) {
				if (w->cmds[i] ==
				    WIDE_ID(pkt->hdr.group_id, pkt->hdr.cmd)) {
					found = true;
					break;
				}
			}
			if (!found)
				continue;

			if (!w->fn || w->fn(notif_wait, pkt, w->fn_data)) {
				w->triggered = true;
				triggered = true;
			}
		}
		spin_unlock(&notif_wait->notif_wait_lock);

	}

	if (triggered)
		wake_up_all(&notif_wait->notif_waitq);
}
IWL_EXPORT_SYMBOL(iwl_notification_wait_notify);

void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
{
	struct iwl_notification_wait *wait_entry;

	spin_lock(&notif_wait->notif_wait_lock);
	list_for_each_entry(wait_entry, &notif_wait->notif_waits, list)
		wait_entry->aborted = true;
	spin_unlock(&notif_wait->notif_wait_lock);

	wake_up_all(&notif_wait->notif_waitq);
}
IWL_EXPORT_SYMBOL(iwl_abort_notification_waits);

void
iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
			   struct iwl_notification_wait *wait_entry,
			   const u16 *cmds, int n_cmds,
			   bool (*fn)(struct iwl_notif_wait_data *notif_wait,
				      struct iwl_rx_packet *pkt, void *data),
			   void *fn_data)
{
	if (WARN_ON(n_cmds > MAX_NOTIF_CMDS))
		n_cmds = MAX_NOTIF_CMDS;

	wait_entry->fn = fn;
	wait_entry->fn_data = fn_data;
	wait_entry->n_cmds = n_cmds;
	memcpy(wait_entry->cmds, cmds, n_cmds * sizeof(u16));
	wait_entry->triggered = false;
	wait_entry->aborted = false;

	spin_lock_bh(&notif_wait->notif_wait_lock);
	list_add(&wait_entry->list, &notif_wait->notif_waits);
	spin_unlock_bh(&notif_wait->notif_wait_lock);
}
IWL_EXPORT_SYMBOL(iwl_init_notification_wait);

int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
			  struct iwl_notification_wait *wait_entry,
			  unsigned long timeout)
{
	int ret;

	ret = wait_event_timeout(notif_wait->notif_waitq,
				 wait_entry->triggered || wait_entry->aborted,
				 timeout);

	spin_lock_bh(&notif_wait->notif_wait_lock);
	list_del(&wait_entry->list);
	spin_unlock_bh(&notif_wait->notif_wait_lock);

	if (wait_entry->aborted)
		return -EIO;

	/* return value is always >= 0 */
	if (ret <= 0)
		return -ETIMEDOUT;
	return 0;
}
IWL_EXPORT_SYMBOL(iwl_wait_notification);

void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
			     struct iwl_notification_wait *wait_entry)
{
	spin_lock_bh(&notif_wait->notif_wait_lock);
	list_del(&wait_entry->list);
	spin_unlock_bh(&notif_wait->notif_wait_lock);
}
IWL_EXPORT_SYMBOL(iwl_remove_notification);
Commit	Line	Data
4bd14dd5 JB	1	/******************************************************************************
	2	*
	3	* This file is provided under a dual BSD/GPLv2 license. When using or
	4	* redistributing this file, you may do so under either license.
	5	*
	6	* GPL LICENSE SUMMARY
	7	*
51368bf7	8	* Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
6eb031d2	9	* Copyright(c) 2015 Intel Deutschland GmbH
4bd14dd5 JB	10	*
	11	* This program is free software; you can redistribute it and/or modify
	12	* it under the terms of version 2 of the GNU General Public License as
	13	* published by the Free Software Foundation.
	14	*
	15	* This program is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License
	21	* along with this program; if not, write to the Free Software
	22	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
	23	* USA
	24	*
	25	* The full GNU General Public License is included in this distribution
410dc5aa	26	* in the file called COPYING.
4bd14dd5 JB	27	*
4bd14dd5 JB	28	* Contact Information:
d01c5366	29	* Intel Linux Wireless <linuxwifi@intel.com>
4bd14dd5 JB	30	* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
	31	*
	32	* BSD LICENSE
	33	*
51368bf7	34	* Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
4bd14dd5 JB	35	* All rights reserved.
	36	*
	37	* Redistribution and use in source and binary forms, with or without
	38	* modification, are permitted provided that the following conditions
	39	* are met:
	40	*
	41	* * Redistributions of source code must retain the above copyright
	42	* notice, this list of conditions and the following disclaimer.
	43	* * Redistributions in binary form must reproduce the above copyright
	44	* notice, this list of conditions and the following disclaimer in
	45	* the documentation and/or other materials provided with the
	46	* distribution.
	47	* * Neither the name Intel Corporation nor the names of its
	48	* contributors may be used to endorse or promote products derived
	49	* from this software without specific prior written permission.
	50	*
	51	* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	52	* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	53	* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	54	* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	55	* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	56	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	57	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	58	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	59	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	60	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	61	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	62	*
	63	*****************************************************************************/
	64	#include <linux/sched.h>
ac91f910	65	#include <linux/export.h>
4bd14dd5	66
48e29340	67	#include "iwl-drv.h"
4bd14dd5 JB	68	#include "iwl-notif-wait.h"
	69
	70
	71	void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
	72	{
	73	spin_lock_init(&notif_wait->notif_wait_lock);
	74	INIT_LIST_HEAD(&notif_wait->notif_waits);
	75	init_waitqueue_head(&notif_wait->notif_waitq);
	76	}
48e29340	77	IWL_EXPORT_SYMBOL(iwl_notification_wait_init);
4bd14dd5 JB	78
	79	void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_wait,
	80	struct iwl_rx_packet *pkt)
	81	{
db662d47 JB	82	bool triggered = false;
db662d47 JB	83
4bd14dd5 JB	84	if (!list_empty(&notif_wait->notif_waits)) {
	85	struct iwl_notification_wait *w;
	86
	87	spin_lock(&notif_wait->notif_wait_lock);
	88	list_for_each_entry(w, &notif_wait->notif_waits, list) {
db662d47 JB	89	int i;
	90	bool found = false;
	91
	92	/*
	93	* If it already finished (triggered) or has been
	94	* aborted then don't evaluate it again to avoid races,
	95	* Otherwise the function could be called again even
	96	* though it returned true before
	97	*/
	98	if (w->triggered \|\| w->aborted)
	99	continue;
	100
	101	for (i = 0; i < w->n_cmds; i++) {
6eb031d2 SS	102	if (w->cmds[i] ==
6eb031d2 SS	103	WIDE_ID(pkt->hdr.group_id, pkt->hdr.cmd)) {
db662d47 JB	104	found = true;
	105	break;
	106	}
	107	}
	108	if (!found)
4bd14dd5	109	continue;
db662d47 JB	110
	111	if (!w->fn \|\| w->fn(notif_wait, pkt, w->fn_data)) {
	112	w->triggered = true;
	113	triggered = true;
	114	}
4bd14dd5 JB	115	}
	116	spin_unlock(&notif_wait->notif_wait_lock);
	117
4bd14dd5	118	}
db662d47 JB	119
	120	if (triggered)
	121	wake_up_all(&notif_wait->notif_waitq);
4bd14dd5	122	}
48e29340	123	IWL_EXPORT_SYMBOL(iwl_notification_wait_notify);
4bd14dd5 JB	124
	125	void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
	126	{
4bd14dd5 JB	127	struct iwl_notification_wait *wait_entry;
4bd14dd5 JB	128
3595c003	129	spin_lock(&notif_wait->notif_wait_lock);
4bd14dd5 JB	130	list_for_each_entry(wait_entry, &notif_wait->notif_waits, list)
4bd14dd5 JB	131	wait_entry->aborted = true;
3595c003	132	spin_unlock(&notif_wait->notif_wait_lock);
4bd14dd5 JB	133
	134	wake_up_all(&notif_wait->notif_waitq);
	135	}
48e29340	136	IWL_EXPORT_SYMBOL(iwl_abort_notification_waits);
4bd14dd5 JB	137
	138	void
	139	iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
	140	struct iwl_notification_wait *wait_entry,
6eb031d2	141	const u16 *cmds, int n_cmds,
db662d47	142	bool (fn)(struct iwl_notif_wait_data notif_wait,
4bd14dd5 JB	143	struct iwl_rx_packet pkt, void data),
	144	void *fn_data)
	145	{
db662d47 JB	146	if (WARN_ON(n_cmds > MAX_NOTIF_CMDS))
	147	n_cmds = MAX_NOTIF_CMDS;
	148
4bd14dd5 JB	149	wait_entry->fn = fn;
4bd14dd5 JB	150	wait_entry->fn_data = fn_data;
db662d47	151	wait_entry->n_cmds = n_cmds;
6eb031d2	152	memcpy(wait_entry->cmds, cmds, n_cmds * sizeof(u16));
4bd14dd5 JB	153	wait_entry->triggered = false;
	154	wait_entry->aborted = false;
	155
	156	spin_lock_bh(&notif_wait->notif_wait_lock);
	157	list_add(&wait_entry->list, &notif_wait->notif_waits);
	158	spin_unlock_bh(&notif_wait->notif_wait_lock);
	159	}
48e29340	160	IWL_EXPORT_SYMBOL(iwl_init_notification_wait);
4bd14dd5 JB	161
	162	int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
	163	struct iwl_notification_wait *wait_entry,
	164	unsigned long timeout)
	165	{
	166	int ret;
	167
	168	ret = wait_event_timeout(notif_wait->notif_waitq,
	169	wait_entry->triggered \|\| wait_entry->aborted,
	170	timeout);
	171
	172	spin_lock_bh(&notif_wait->notif_wait_lock);
	173	list_del(&wait_entry->list);
	174	spin_unlock_bh(&notif_wait->notif_wait_lock);
	175
	176	if (wait_entry->aborted)
	177	return -EIO;
	178
	179	/* return value is always >= 0 */
	180	if (ret <= 0)
	181	return -ETIMEDOUT;
	182	return 0;
	183	}
48e29340	184	IWL_EXPORT_SYMBOL(iwl_wait_notification);
4bd14dd5 JB	185
	186	void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
	187	struct iwl_notification_wait *wait_entry)
	188	{
	189	spin_lock_bh(&notif_wait->notif_wait_lock);
	190	list_del(&wait_entry->list);
	191	spin_unlock_bh(&notif_wait->notif_wait_lock);
	192	}
48e29340	193	IWL_EXPORT_SYMBOL(iwl_remove_notification);