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135 lines
3.5 KiB
135 lines
3.5 KiB
// 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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