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
  13 void 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 }
  19 IWL_EXPORT_SYMBOL(iwl_notification_wait_init);
  20
  21 bool 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 }
  67 IWL_EXPORT_SYMBOL(iwl_notification_wait);
  68
  69 void 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 }
  80 IWL_EXPORT_SYMBOL(iwl_abort_notification_waits);
  81
  82 void
  83 iwl_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 }
 104 IWL_EXPORT_SYMBOL(iwl_init_notification_wait);
 105
 106 void 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 }
 113 IWL_EXPORT_SYMBOL(iwl_remove_notification);
 114
 115 int 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 }
 135 IWL_EXPORT_SYMBOL(iwl_wait_notification);