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

   1 /******************************************************************************
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   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 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.
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  15  * This program is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
  23  * USA
  24  *
  25  * The full GNU General Public License is included in this distribution
  26  * in the file called COPYING.
  27  *
  28  * Contact Information:
  29  *  Intel Linux Wireless <linuxwifi@intel.com>
  30  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  31  *
  32  * BSD LICENSE
  33  *
  34  * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved.
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  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
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  41  *  * Redistributions of source code must retain the above copyright
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  49  *    from this software without specific prior written permission.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  52  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  53  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  54  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  55  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  56  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  57  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  58  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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  60  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  61  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  62  *
  63  *****************************************************************************/
  64 #include <linux/sched.h>
  65 #include <linux/export.h>
  66
  67 #include "iwl-drv.h"
  68 #include "iwl-notif-wait.h"
  69
  70
  71 void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait)
  72 {
  73         spin_lock_init(&notif_wait->notif_wait_lock);
  74         INIT_LIST_HEAD(&notif_wait->notif_waits);
  75         init_waitqueue_head(&notif_wait->notif_waitq);
  76 }
  77 IWL_EXPORT_SYMBOL(iwl_notification_wait_init);
  78
  79 void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_wait,
  80                                   struct iwl_rx_packet *pkt)
  81 {
  82         bool triggered = false;
  83
  84         if (!list_empty(&notif_wait->notif_waits)) {
  85                 struct iwl_notification_wait *w;
  86
  87                 spin_lock(&notif_wait->notif_wait_lock);
  88                 list_for_each_entry(w, &notif_wait->notif_waits, list) {
  89                         int i;
  90                         bool found = false;
  91
  92                         /*
  93                          * If it already finished (triggered) or has been
  94                          * aborted then don't evaluate it again to avoid races,
  95                          * Otherwise the function could be called again even
  96                          * though it returned true before
  97                          */
  98                         if (w->triggered || w->aborted)
  99                                 continue;
 100
 101                         for (i = 0; i < w->n_cmds; i++) {
 102                                 if (w->cmds[i] ==
 103                                     WIDE_ID(pkt->hdr.group_id, pkt->hdr.cmd)) {
 104                                         found = true;
 105                                         break;
 106                                 }
 107                         }
 108                         if (!found)
 109                                 continue;
 110
 111                         if (!w->fn || w->fn(notif_wait, pkt, w->fn_data)) {
 112                                 w->triggered = true;
 113                                 triggered = true;
 114                         }
 115                 }
 116                 spin_unlock(&notif_wait->notif_wait_lock);
 117
 118         }
 119
 120         if (triggered)
 121                 wake_up_all(&notif_wait->notif_waitq);
 122 }
 123 IWL_EXPORT_SYMBOL(iwl_notification_wait_notify);
 124
 125 void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait)
 126 {
 127         struct iwl_notification_wait *wait_entry;
 128
 129         spin_lock(&notif_wait->notif_wait_lock);
 130         list_for_each_entry(wait_entry, &notif_wait->notif_waits, list)
 131                 wait_entry->aborted = true;
 132         spin_unlock(&notif_wait->notif_wait_lock);
 133
 134         wake_up_all(&notif_wait->notif_waitq);
 135 }
 136 IWL_EXPORT_SYMBOL(iwl_abort_notification_waits);
 137
 138 void
 139 iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait,
 140                            struct iwl_notification_wait *wait_entry,
 141                            const u16 *cmds, int n_cmds,
 142                            bool (*fn)(struct iwl_notif_wait_data *notif_wait,
 143                                       struct iwl_rx_packet *pkt, void *data),
 144                            void *fn_data)
 145 {
 146         if (WARN_ON(n_cmds > MAX_NOTIF_CMDS))
 147                 n_cmds = MAX_NOTIF_CMDS;
 148
 149         wait_entry->fn = fn;
 150         wait_entry->fn_data = fn_data;
 151         wait_entry->n_cmds = n_cmds;
 152         memcpy(wait_entry->cmds, cmds, n_cmds * sizeof(u16));
 153         wait_entry->triggered = false;
 154         wait_entry->aborted = false;
 155
 156         spin_lock_bh(&notif_wait->notif_wait_lock);
 157         list_add(&wait_entry->list, &notif_wait->notif_waits);
 158         spin_unlock_bh(&notif_wait->notif_wait_lock);
 159 }
 160 IWL_EXPORT_SYMBOL(iwl_init_notification_wait);
 161
 162 int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait,
 163                           struct iwl_notification_wait *wait_entry,
 164                           unsigned long timeout)
 165 {
 166         int ret;
 167
 168         ret = wait_event_timeout(notif_wait->notif_waitq,
 169                                  wait_entry->triggered || wait_entry->aborted,
 170                                  timeout);
 171
 172         spin_lock_bh(&notif_wait->notif_wait_lock);
 173         list_del(&wait_entry->list);
 174         spin_unlock_bh(&notif_wait->notif_wait_lock);
 175
 176         if (wait_entry->aborted)
 177                 return -EIO;
 178
 179         /* return value is always >= 0 */
 180         if (ret <= 0)
 181                 return -ETIMEDOUT;
 182         return 0;
 183 }
 184 IWL_EXPORT_SYMBOL(iwl_wait_notification);
 185
 186 void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait,
 187                              struct iwl_notification_wait *wait_entry)
 188 {
 189         spin_lock_bh(&notif_wait->notif_wait_lock);
 190         list_del(&wait_entry->list);
 191         spin_unlock_bh(&notif_wait->notif_wait_lock);
 192 }
 193 IWL_EXPORT_SYMBOL(iwl_remove_notification);