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1// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause2/*3 * Copyright (C) 2005-2014, 2021 Intel Corporation4 * Copyright (C) 2015-2017 Intel Deutschland GmbH5 */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 been36			 * aborted then don't evaluate it again to avoid races,37			 * Otherwise the function could be called again even38			 * though it returned true before39			 */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 82void83iwl_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