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);