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1/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
2/*
3 * Copyright (C) 2005-2014, 2023 Intel Corporation
4 * Copyright (C) 2015-2017 Intel Deutschland GmbH
5 */
6#ifndef __iwl_notif_wait_h__
7#define __iwl_notif_wait_h__
8
9#include <linux/wait.h>
10
11#include "iwl-trans.h"
12
13struct iwl_notif_wait_data {
14 struct list_head notif_waits;
15 spinlock_t notif_wait_lock;
16 wait_queue_head_t notif_waitq;
17};
18
19#define MAX_NOTIF_CMDS 5
20
21/**
22 * struct iwl_notification_wait - notification wait entry
23 * @list: list head for global list
24 * @fn: Function called with the notification. If the function
25 * returns true, the wait is over, if it returns false then
26 * the waiter stays blocked. If no function is given, any
27 * of the listed commands will unblock the waiter.
28 * @fn_data: pointer to pass to the @fn's data argument
29 * @cmds: command IDs
30 * @n_cmds: number of command IDs
31 * @triggered: waiter should be woken up
32 * @aborted: wait was aborted
33 *
34 * This structure is not used directly, to wait for a
35 * notification declare it on the stack, and call
36 * iwl_init_notification_wait() with appropriate
37 * parameters. Then do whatever will cause the ucode
38 * to notify the driver, and to wait for that then
39 * call iwl_wait_notification().
40 *
41 * Each notification is one-shot. If at some point we
42 * need to support multi-shot notifications (which
43 * can't be allocated on the stack) we need to modify
44 * the code for them.
45 */
46struct iwl_notification_wait {
47 struct list_head list;
48
49 bool (*fn)(struct iwl_notif_wait_data *notif_data,
50 struct iwl_rx_packet *pkt, void *data);
51 void *fn_data;
52
53 u16 cmds[MAX_NOTIF_CMDS];
54 u8 n_cmds;
55 bool triggered, aborted;
56};
57
58
59/* caller functions */
60void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_data);
61bool iwl_notification_wait(struct iwl_notif_wait_data *notif_data,
62 struct iwl_rx_packet *pkt);
63void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_data);
64
65static inline void
66iwl_notification_notify(struct iwl_notif_wait_data *notif_data)
67{
68 wake_up_all(¬if_data->notif_waitq);
69}
70
71static inline void
72iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_data,
73 struct iwl_rx_packet *pkt)
74{
75 if (iwl_notification_wait(notif_data, pkt))
76 iwl_notification_notify(notif_data);
77}
78
79/* user functions */
80void __acquires(wait_entry)
81iwl_init_notification_wait(struct iwl_notif_wait_data *notif_data,
82 struct iwl_notification_wait *wait_entry,
83 const u16 *cmds, int n_cmds,
84 bool (*fn)(struct iwl_notif_wait_data *notif_data,
85 struct iwl_rx_packet *pkt, void *data),
86 void *fn_data);
87
88int __must_check __releases(wait_entry)
89iwl_wait_notification(struct iwl_notif_wait_data *notif_data,
90 struct iwl_notification_wait *wait_entry,
91 unsigned long timeout);
92
93void __releases(wait_entry)
94iwl_remove_notification(struct iwl_notif_wait_data *notif_data,
95 struct iwl_notification_wait *wait_entry);
96
97#endif /* __iwl_notif_wait_h__ */
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 *
8 * Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
9 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
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 * The full GNU General Public License is included in this distribution
21 * in the file called COPYING.
22 *
23 * Contact Information:
24 * Intel Linux Wireless <linuxwifi@intel.com>
25 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
26 *
27 * BSD LICENSE
28 *
29 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
30 * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
31 * All rights reserved.
32 *
33 * Redistribution and use in source and binary forms, with or without
34 * modification, are permitted provided that the following conditions
35 * are met:
36 *
37 * * Redistributions of source code must retain the above copyright
38 * notice, this list of conditions and the following disclaimer.
39 * * Redistributions in binary form must reproduce the above copyright
40 * notice, this list of conditions and the following disclaimer in
41 * distribution.
42 * * Neither the name Intel Corporation nor the names of its
43 * contributors may be used to endorse or promote products derived
44 * from this software without specific prior written permission.
45 *
46 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
47 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
48 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
49 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
50 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
51 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
52 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
53 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
54 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
55 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
56 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
57 *
58 *****************************************************************************/
59#ifndef __iwl_notif_wait_h__
60#define __iwl_notif_wait_h__
61
62#include <linux/wait.h>
63
64#include "iwl-trans.h"
65
66struct iwl_notif_wait_data {
67 struct list_head notif_waits;
68 spinlock_t notif_wait_lock;
69 wait_queue_head_t notif_waitq;
70};
71
72#define MAX_NOTIF_CMDS 5
73
74/**
75 * struct iwl_notification_wait - notification wait entry
76 * @list: list head for global list
77 * @fn: Function called with the notification. If the function
78 * returns true, the wait is over, if it returns false then
79 * the waiter stays blocked. If no function is given, any
80 * of the listed commands will unblock the waiter.
81 * @cmds: command IDs
82 * @n_cmds: number of command IDs
83 * @triggered: waiter should be woken up
84 * @aborted: wait was aborted
85 *
86 * This structure is not used directly, to wait for a
87 * notification declare it on the stack, and call
88 * iwl_init_notification_wait() with appropriate
89 * parameters. Then do whatever will cause the ucode
90 * to notify the driver, and to wait for that then
91 * call iwl_wait_notification().
92 *
93 * Each notification is one-shot. If at some point we
94 * need to support multi-shot notifications (which
95 * can't be allocated on the stack) we need to modify
96 * the code for them.
97 */
98struct iwl_notification_wait {
99 struct list_head list;
100
101 bool (*fn)(struct iwl_notif_wait_data *notif_data,
102 struct iwl_rx_packet *pkt, void *data);
103 void *fn_data;
104
105 u16 cmds[MAX_NOTIF_CMDS];
106 u8 n_cmds;
107 bool triggered, aborted;
108};
109
110
111/* caller functions */
112void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_data);
113bool iwl_notification_wait(struct iwl_notif_wait_data *notif_data,
114 struct iwl_rx_packet *pkt);
115void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_data);
116
117static inline void
118iwl_notification_notify(struct iwl_notif_wait_data *notif_data)
119{
120 wake_up_all(¬if_data->notif_waitq);
121}
122
123static inline void
124iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_data,
125 struct iwl_rx_packet *pkt)
126{
127 if (iwl_notification_wait(notif_data, pkt))
128 iwl_notification_notify(notif_data);
129}
130
131/* user functions */
132void __acquires(wait_entry)
133iwl_init_notification_wait(struct iwl_notif_wait_data *notif_data,
134 struct iwl_notification_wait *wait_entry,
135 const u16 *cmds, int n_cmds,
136 bool (*fn)(struct iwl_notif_wait_data *notif_data,
137 struct iwl_rx_packet *pkt, void *data),
138 void *fn_data);
139
140int __must_check __releases(wait_entry)
141iwl_wait_notification(struct iwl_notif_wait_data *notif_data,
142 struct iwl_notification_wait *wait_entry,
143 unsigned long timeout);
144
145void __releases(wait_entry)
146iwl_remove_notification(struct iwl_notif_wait_data *notif_data,
147 struct iwl_notification_wait *wait_entry);
148
149#endif /* __iwl_notif_wait_h__ */