LXR linux/drivers/net/wireless/intel/iwlwifi/fw/notif-wait.c

   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