1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2/*
3 * Copyright (C) 2005-2014, 2021 Intel Corporation
4 * Copyright (C) 2015-2017 Intel Deutschland GmbH
5 */
6#include <linux/sched.h>
7#include <linux/export.h>
8
9#include "iwl-drv.h"
10#include "notif-wait.h"
11
12
13void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
14{
15	spin_lock_init(&notif_wait->notif_wait_lock);
16	INIT_LIST_HEAD(&notif_wait->notif_waits);
17	init_waitqueue_head(&notif_wait->notif_waitq);
18}
19IWL_EXPORT_SYMBOL(iwl_notification_wait_init);
20
21bool iwl_notification_wait(struct iwl_notif_wait_data *notif_wait,
22			   struct iwl_rx_packet *pkt)
23{
24	bool triggered = false;
25
26	if (!list_empty(&notif_wait->notif_waits)) {
27		struct iwl_notification_wait *w;
28
29		spin_lock_bh(&notif_wait->notif_wait_lock);
30		list_for_each_entry(w, &notif_wait->notif_waits, list) {
31			int i;
32			bool found = false;
33
34			/*
35			 * If it already finished (triggered) or has been
36			 * aborted then don't evaluate it again to avoid races,
37			 * Otherwise the function could be called again even
38			 * though it returned true before
39			 */
40			if (w->triggered || w->aborted)
41				continue;
42
43			for (i = 0; i < w->n_cmds; i++) {
44				u16 rec_id = WIDE_ID(pkt->hdr.group_id,
45						     pkt->hdr.cmd);
46
47				if (w->cmds[i] == rec_id ||
48				    (!iwl_cmd_groupid(w->cmds[i]) &&
49				     DEF_ID(w->cmds[i]) == rec_id)) {
50					found = true;
51					break;
52				}
53			}
54			if (!found)
55				continue;
56
57			if (!w->fn || w->fn(notif_wait, pkt, w->fn_data)) {
58				w->triggered = true;
59				triggered = true;
60			}
61		}
62		spin_unlock_bh(&notif_wait->notif_wait_lock);
63	}
64
65	return triggered;
66}
67IWL_EXPORT_SYMBOL(iwl_notification_wait);
68
69void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
70{
71	struct iwl_notification_wait *wait_entry;
72
73	spin_lock_bh(&notif_wait->notif_wait_lock);
74	list_for_each_entry(wait_entry, &notif_wait->notif_waits, list)
75		wait_entry->aborted = true;
76	spin_unlock_bh(&notif_wait->notif_wait_lock);
77
78	wake_up_all(&notif_wait->notif_waitq);
79}
80IWL_EXPORT_SYMBOL(iwl_abort_notification_waits);
81
82void
83iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
84			   struct iwl_notification_wait *wait_entry,
85			   const u16 *cmds, int n_cmds,
86			   bool (*fn)(struct iwl_notif_wait_data *notif_wait,
87				      struct iwl_rx_packet *pkt, void *data),
88			   void *fn_data)
89{
90	if (WARN_ON(n_cmds > MAX_NOTIF_CMDS))
91		n_cmds = MAX_NOTIF_CMDS;
92
93	wait_entry->fn = fn;
94	wait_entry->fn_data = fn_data;
95	wait_entry->n_cmds = n_cmds;
96	memcpy(wait_entry->cmds, cmds, n_cmds * sizeof(u16));
97	wait_entry->triggered = false;
98	wait_entry->aborted = false;
99
100	spin_lock_bh(&notif_wait->notif_wait_lock);
101	list_add(&wait_entry->list, &notif_wait->notif_waits);
102	spin_unlock_bh(&notif_wait->notif_wait_lock);
103}
104IWL_EXPORT_SYMBOL(iwl_init_notification_wait);
105
106void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
107			     struct iwl_notification_wait *wait_entry)
108{
109	spin_lock_bh(&notif_wait->notif_wait_lock);
110	list_del(&wait_entry->list);
111	spin_unlock_bh(&notif_wait->notif_wait_lock);
112}
113IWL_EXPORT_SYMBOL(iwl_remove_notification);
114
115int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
116			  struct iwl_notification_wait *wait_entry,
117			  unsigned long timeout)
118{
119	int ret;
120
121	ret = wait_event_timeout(notif_wait->notif_waitq,
122				 wait_entry->triggered || wait_entry->aborted,
123				 timeout);
124
125	iwl_remove_notification(notif_wait, wait_entry);
126
127	if (wait_entry->aborted)
128		return -EIO;
129
130	/* return value is always >= 0 */
131	if (ret <= 0)
132		return -ETIMEDOUT;
133	return 0;
134}
135IWL_EXPORT_SYMBOL(iwl_wait_notification);
136