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 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of version 2 of the GNU General Public License as 12 * published by the Free Software Foundation. 13 * 14 * This program is distributed in the hope that it will be useful, but 15 * WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110, 22 * USA 23 * 24 * The full GNU General Public License is included in this distribution 25 * in the file called COPYING. 26 * 27 * Contact Information: 28 * Intel Linux Wireless <ilw@linux.intel.com> 29 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 30 * 31 * BSD LICENSE 32 * 33 * Copyright(c) 2005 - 2014 Intel Corporation. All rights reserved. 34 * All rights reserved. 35 * 36 * Redistribution and use in source and binary forms, with or without 37 * modification, are permitted provided that the following conditions 38 * are met: 39 * 40 * * Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * * Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in 44 * the documentation and/or other materials provided with the 45 * distribution. 46 * * Neither the name Intel Corporation nor the names of its 47 * contributors may be used to endorse or promote products derived 48 * from this software without specific prior written permission. 49 * 50 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 51 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 52 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 53 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 54 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 55 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 56 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 57 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 58 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 59 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 60 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 61 * 62 *****************************************************************************/ 63#include <linux/sched.h> 64#include <linux/export.h> 65 66#include "iwl-drv.h" 67#include "iwl-notif-wait.h" 68 69 70void iwl_notification_wait_init(struct iwl_notif_wait_data *notif_wait) 71{ 72 spin_lock_init(¬if_wait->notif_wait_lock); 73 INIT_LIST_HEAD(¬if_wait->notif_waits); 74 init_waitqueue_head(¬if_wait->notif_waitq); 75} 76IWL_EXPORT_SYMBOL(iwl_notification_wait_init); 77 78void iwl_notification_wait_notify(struct iwl_notif_wait_data *notif_wait, 79 struct iwl_rx_packet *pkt) 80{ 81 bool triggered = false; 82 83 if (!list_empty(¬if_wait->notif_waits)) { 84 struct iwl_notification_wait *w; 85 86 spin_lock(¬if_wait->notif_wait_lock); 87 list_for_each_entry(w, ¬if_wait->notif_waits, list) { 88 int i; 89 bool found = false; 90 91 /* 92 * If it already finished (triggered) or has been 93 * aborted then don't evaluate it again to avoid races, 94 * Otherwise the function could be called again even 95 * though it returned true before 96 */ 97 if (w->triggered || w->aborted) 98 continue; 99 100 for (i = 0; i < w->n_cmds; i++) { 101 if (w->cmds[i] == pkt->hdr.cmd) { 102 found = true; 103 break; 104 } 105 } 106 if (!found) 107 continue; 108 109 if (!w->fn || w->fn(notif_wait, pkt, w->fn_data)) { 110 w->triggered = true; 111 triggered = true; 112 } 113 } 114 spin_unlock(¬if_wait->notif_wait_lock); 115 116 } 117 118 if (triggered) 119 wake_up_all(¬if_wait->notif_waitq); 120} 121IWL_EXPORT_SYMBOL(iwl_notification_wait_notify); 122 123void iwl_abort_notification_waits(struct iwl_notif_wait_data *notif_wait) 124{ 125 struct iwl_notification_wait *wait_entry; 126 127 spin_lock(¬if_wait->notif_wait_lock); 128 list_for_each_entry(wait_entry, ¬if_wait->notif_waits, list) 129 wait_entry->aborted = true; 130 spin_unlock(¬if_wait->notif_wait_lock); 131 132 wake_up_all(¬if_wait->notif_waitq); 133} 134IWL_EXPORT_SYMBOL(iwl_abort_notification_waits); 135 136void 137iwl_init_notification_wait(struct iwl_notif_wait_data *notif_wait, 138 struct iwl_notification_wait *wait_entry, 139 const u8 *cmds, int n_cmds, 140 bool (*fn)(struct iwl_notif_wait_data *notif_wait, 141 struct iwl_rx_packet *pkt, void *data), 142 void *fn_data) 143{ 144 if (WARN_ON(n_cmds > MAX_NOTIF_CMDS)) 145 n_cmds = MAX_NOTIF_CMDS; 146 147 wait_entry->fn = fn; 148 wait_entry->fn_data = fn_data; 149 wait_entry->n_cmds = n_cmds; 150 memcpy(wait_entry->cmds, cmds, n_cmds); 151 wait_entry->triggered = false; 152 wait_entry->aborted = false; 153 154 spin_lock_bh(¬if_wait->notif_wait_lock); 155 list_add(&wait_entry->list, ¬if_wait->notif_waits); 156 spin_unlock_bh(¬if_wait->notif_wait_lock); 157} 158IWL_EXPORT_SYMBOL(iwl_init_notification_wait); 159 160int iwl_wait_notification(struct iwl_notif_wait_data *notif_wait, 161 struct iwl_notification_wait *wait_entry, 162 unsigned long timeout) 163{ 164 int ret; 165 166 ret = wait_event_timeout(notif_wait->notif_waitq, 167 wait_entry->triggered || wait_entry->aborted, 168 timeout); 169 170 spin_lock_bh(¬if_wait->notif_wait_lock); 171 list_del(&wait_entry->list); 172 spin_unlock_bh(¬if_wait->notif_wait_lock); 173 174 if (wait_entry->aborted) 175 return -EIO; 176 177 /* return value is always >= 0 */ 178 if (ret <= 0) 179 return -ETIMEDOUT; 180 return 0; 181} 182IWL_EXPORT_SYMBOL(iwl_wait_notification); 183 184void iwl_remove_notification(struct iwl_notif_wait_data *notif_wait, 185 struct iwl_notification_wait *wait_entry) 186{ 187 spin_lock_bh(¬if_wait->notif_wait_lock); 188 list_del(&wait_entry->list); 189 spin_unlock_bh(¬if_wait->notif_wait_lock); 190} 191IWL_EXPORT_SYMBOL(iwl_remove_notification); 192