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
iwl_notification_wait_init(struct iwl_notif_wait_data * notif_wait)70 void 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 }
76 IWL_EXPORT_SYMBOL(iwl_notification_wait_init);
77
iwl_notification_wait_notify(struct iwl_notif_wait_data * notif_wait,struct iwl_rx_packet * pkt)78 void 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 }
121 IWL_EXPORT_SYMBOL(iwl_notification_wait_notify);
122
iwl_abort_notification_waits(struct iwl_notif_wait_data * notif_wait)123 void 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 }
134 IWL_EXPORT_SYMBOL(iwl_abort_notification_waits);
135
136 void
iwl_init_notification_wait(struct iwl_notif_wait_data * notif_wait,struct iwl_notification_wait * wait_entry,const u8 * cmds,int n_cmds,bool (* fn)(struct iwl_notif_wait_data * notif_wait,struct iwl_rx_packet * pkt,void * data),void * fn_data)137 iwl_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 }
158 IWL_EXPORT_SYMBOL(iwl_init_notification_wait);
159
iwl_wait_notification(struct iwl_notif_wait_data * notif_wait,struct iwl_notification_wait * wait_entry,unsigned long timeout)160 int 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 }
182 IWL_EXPORT_SYMBOL(iwl_wait_notification);
183
iwl_remove_notification(struct iwl_notif_wait_data * notif_wait,struct iwl_notification_wait * wait_entry)184 void 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 }
191 IWL_EXPORT_SYMBOL(iwl_remove_notification);
192