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

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2007 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of version 2 of the GNU General Public License as
  13  * published by the Free Software Foundation.
  14  *
  15  * This program is distributed in the hope that it will be useful, but
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  21  * along with this program; if not, write to the Free Software
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  29  *  Intel Linux Wireless <linuxwifi@intel.com>
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  31  *
  32  * BSD LICENSE
  33  *
  34  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
  35  * Copyright(c) 2015 - 2017 Intel Deutschland GmbH
  36  * All rights reserved.
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  39  * modification, are permitted provided that the following conditions
  40  * are met:
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  43  *    notice, this list of conditions and the following disclaimer.
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  45  *    notice, this list of conditions and the following disclaimer in
  46  *    the documentation and/or other materials provided with the
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  50  *    from this software without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  53  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  54  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  55  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  56  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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  64  *****************************************************************************/
  65 #include <linux/sched.h>
  66 #include <linux/export.h>
  67
  68 #include "iwl-drv.h"
  69 #include "notif-wait.h"
  70
  71
  72 void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
  73 {
  74         spin_lock_init(&notif_wait->notif_wait_lock);
  75         INIT_LIST_HEAD(&notif_wait->notif_waits);
  76         init_waitqueue_head(&notif_wait->notif_waitq);
  77 }
  78 IWL_EXPORT_SYMBOL(iwl_notification_wait_init);
  79
  80 bool iwl_notification_wait(struct iwl_notif_wait_data *notif_wait,
  81                            struct iwl_rx_packet *pkt)
  82 {
  83         bool triggered = false;
  84
  85         if (!list_empty(&notif_wait->notif_waits)) {
  86                 struct iwl_notification_wait *w;
  87
  88                 spin_lock(&notif_wait->notif_wait_lock);
  89                 list_for_each_entry(w, &notif_wait->notif_waits, list) {
  90                         int i;
  91                         bool found = false;
  92
  93                         /*
  94                          * If it already finished (triggered) or has been
  95                          * aborted then don't evaluate it again to avoid races,
  96                          * Otherwise the function could be called again even
  97                          * though it returned true before
  98                          */
  99                         if (w->triggered || w->aborted)
 100                                 continue;
 101
 102                         for (i = 0; i < w->n_cmds; i++) {
 103                                 u16 rec_id = WIDE_ID(pkt->hdr.group_id,
 104                                                      pkt->hdr.cmd);
 105
 106                                 if (w->cmds[i] == rec_id ||
 107                                     (!iwl_cmd_groupid(w->cmds[i]) &&
 108                                      DEF_ID(w->cmds[i]) == rec_id)) {
 109                                         found = true;
 110                                         break;
 111                                 }
 112                         }
 113                         if (!found)
 114                                 continue;
 115
 116                         if (!w->fn || w->fn(notif_wait, pkt, w->fn_data)) {
 117                                 w->triggered = true;
 118                                 triggered = true;
 119                         }
 120                 }
 121                 spin_unlock(&notif_wait->notif_wait_lock);
 122         }
 123
 124         return triggered;
 125 }
 126 IWL_EXPORT_SYMBOL(iwl_notification_wait);
 127
 128 void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
 129 {
 130         struct iwl_notification_wait *wait_entry;
 131
 132         spin_lock(&notif_wait->notif_wait_lock);
 133         list_for_each_entry(wait_entry, &notif_wait->notif_waits, list)
 134                 wait_entry->aborted = true;
 135         spin_unlock(&notif_wait->notif_wait_lock);
 136
 137         wake_up_all(&notif_wait->notif_waitq);
 138 }
 139 IWL_EXPORT_SYMBOL(iwl_abort_notification_waits);
 140
 141 void
 142 iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
 143                            struct iwl_notification_wait *wait_entry,
 144                            const u16 *cmds, int n_cmds,
 145                            bool (*fn)(struct iwl_notif_wait_data *notif_wait,
 146                                       struct iwl_rx_packet *pkt, void *data),
 147                            void *fn_data)
 148 {
 149         if (WARN_ON(n_cmds > MAX_NOTIF_CMDS))
 150                 n_cmds = MAX_NOTIF_CMDS;
 151
 152         wait_entry->fn = fn;
 153         wait_entry->fn_data = fn_data;
 154         wait_entry->n_cmds = n_cmds;
 155         memcpy(wait_entry->cmds, cmds, n_cmds * sizeof(u16));
 156         wait_entry->triggered = false;
 157         wait_entry->aborted = false;
 158
 159         spin_lock_bh(&notif_wait->notif_wait_lock);
 160         list_add(&wait_entry->list, &notif_wait->notif_waits);
 161         spin_unlock_bh(&notif_wait->notif_wait_lock);
 162 }
 163 IWL_EXPORT_SYMBOL(iwl_init_notification_wait);
 164
 165 void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
 166                              struct iwl_notification_wait *wait_entry)
 167 {
 168         spin_lock_bh(&notif_wait->notif_wait_lock);
 169         list_del(&wait_entry->list);
 170         spin_unlock_bh(&notif_wait->notif_wait_lock);
 171 }
 172 IWL_EXPORT_SYMBOL(iwl_remove_notification);
 173
 174 int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
 175                           struct iwl_notification_wait *wait_entry,
 176                           unsigned long timeout)
 177 {
 178         int ret;
 179
 180         ret = wait_event_timeout(notif_wait->notif_waitq,
 181                                  wait_entry->triggered || wait_entry->aborted,
 182                                  timeout);
 183
 184         iwl_remove_notification(notif_wait, wait_entry);
 185
 186         if (wait_entry->aborted)
 187                 return -EIO;
 188
 189         /* return value is always >= 0 */
 190         if (ret <= 0)
 191                 return -ETIMEDOUT;
 192         return 0;
 193 }
 194 IWL_EXPORT_SYMBOL(iwl_wait_notification);