136 lines
3.5 KiB
C
136 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
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/*
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* Copyright (C) 2005-2014, 2021 Intel Corporation
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* Copyright (C) 2015-2017 Intel Deutschland GmbH
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*/
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#include <linux/sched.h>
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#include <linux/export.h>
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#include "iwl-drv.h"
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#include "notif-wait.h"
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void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
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{
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spin_lock_init(¬if_wait->notif_wait_lock);
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INIT_LIST_HEAD(¬if_wait->notif_waits);
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init_waitqueue_head(¬if_wait->notif_waitq);
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}
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IWL_EXPORT_SYMBOL(iwl_notification_wait_init);
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bool iwl_notification_wait(struct iwl_notif_wait_data *notif_wait,
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struct iwl_rx_packet *pkt)
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{
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bool triggered = false;
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if (!list_empty(¬if_wait->notif_waits)) {
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struct iwl_notification_wait *w;
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spin_lock_bh(¬if_wait->notif_wait_lock);
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list_for_each_entry(w, ¬if_wait->notif_waits, list) {
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int i;
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bool found = false;
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/*
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* If it already finished (triggered) or has been
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* aborted then don't evaluate it again to avoid races,
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* Otherwise the function could be called again even
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* though it returned true before
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*/
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if (w->triggered || w->aborted)
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continue;
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for (i = 0; i < w->n_cmds; i++) {
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u16 rec_id = WIDE_ID(pkt->hdr.group_id,
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pkt->hdr.cmd);
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if (w->cmds[i] == rec_id ||
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(!iwl_cmd_groupid(w->cmds[i]) &&
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DEF_ID(w->cmds[i]) == rec_id)) {
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found = true;
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break;
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}
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}
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if (!found)
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continue;
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if (!w->fn || w->fn(notif_wait, pkt, w->fn_data)) {
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w->triggered = true;
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triggered = true;
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}
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}
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spin_unlock_bh(¬if_wait->notif_wait_lock);
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}
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return triggered;
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}
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IWL_EXPORT_SYMBOL(iwl_notification_wait);
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void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
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{
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struct iwl_notification_wait *wait_entry;
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spin_lock_bh(¬if_wait->notif_wait_lock);
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list_for_each_entry(wait_entry, ¬if_wait->notif_waits, list)
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wait_entry->aborted = true;
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spin_unlock_bh(¬if_wait->notif_wait_lock);
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wake_up_all(¬if_wait->notif_waitq);
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}
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IWL_EXPORT_SYMBOL(iwl_abort_notification_waits);
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void
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iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
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struct iwl_notification_wait *wait_entry,
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const u16 *cmds, int n_cmds,
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bool (*fn)(struct iwl_notif_wait_data *notif_wait,
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struct iwl_rx_packet *pkt, void *data),
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void *fn_data)
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{
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if (WARN_ON(n_cmds > MAX_NOTIF_CMDS))
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n_cmds = MAX_NOTIF_CMDS;
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wait_entry->fn = fn;
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wait_entry->fn_data = fn_data;
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wait_entry->n_cmds = n_cmds;
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memcpy(wait_entry->cmds, cmds, n_cmds * sizeof(u16));
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wait_entry->triggered = false;
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wait_entry->aborted = false;
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spin_lock_bh(¬if_wait->notif_wait_lock);
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list_add(&wait_entry->list, ¬if_wait->notif_waits);
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spin_unlock_bh(¬if_wait->notif_wait_lock);
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}
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IWL_EXPORT_SYMBOL(iwl_init_notification_wait);
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void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
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struct iwl_notification_wait *wait_entry)
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{
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spin_lock_bh(¬if_wait->notif_wait_lock);
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list_del(&wait_entry->list);
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spin_unlock_bh(¬if_wait->notif_wait_lock);
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}
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IWL_EXPORT_SYMBOL(iwl_remove_notification);
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int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
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struct iwl_notification_wait *wait_entry,
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unsigned long timeout)
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{
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int ret;
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ret = wait_event_timeout(notif_wait->notif_waitq,
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wait_entry->triggered || wait_entry->aborted,
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timeout);
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iwl_remove_notification(notif_wait, wait_entry);
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if (wait_entry->aborted)
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return -EIO;
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/* return value is always >= 0 */
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if (ret <= 0)
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return -ETIMEDOUT;
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return 0;
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}
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IWL_EXPORT_SYMBOL(iwl_wait_notification);
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