1 /******************************************************************************
2 *
3 * Copyright (C) 2012 Broadcom Corporation
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at:
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 *
17 ******************************************************************************/
18
19 /************************************************************************************
20 *
21 * Filename: bt_utils.c
22 *
23 * Description: Miscellaneous helper functions
24 *
25 *
26 ***********************************************************************************/
27
28 #define LOG_TAG "bt_utils"
29
30 #include <cutils/properties.h>
31 #include <cutils/sched_policy.h>
32 #include <errno.h>
33 #include <pthread.h>
34 #include <sys/resource.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <unistd.h>
38 #include <utils/ThreadDefs.h>
39
40 #include "bt_types.h"
41 #include "bt_utils.h"
42 #include "btcore/include/module.h"
43 #include "osi/include/compat.h"
44 #include "osi/include/log.h"
45
46 /*******************************************************************************
47 ** Type definitions for callback functions
48 ********************************************************************************/
49 static pthread_once_t g_DoSchedulingGroupOnce[TASK_HIGH_MAX];
50 static BOOLEAN g_DoSchedulingGroup[TASK_HIGH_MAX];
51 static pthread_mutex_t gIdxLock;
52 static int g_TaskIdx;
53 static int g_TaskIDs[TASK_HIGH_MAX];
54 #define INVALID_TASK_ID (-1)
55
init(void)56 static future_t *init(void) {
57 int i;
58 pthread_mutexattr_t lock_attr;
59
60 for(i = 0; i < TASK_HIGH_MAX; i++) {
61 g_DoSchedulingGroupOnce[i] = PTHREAD_ONCE_INIT;
62 g_DoSchedulingGroup[i] = TRUE;
63 g_TaskIDs[i] = INVALID_TASK_ID;
64 }
65
66 pthread_mutexattr_init(&lock_attr);
67 pthread_mutex_init(&gIdxLock, &lock_attr);
68 return NULL;
69 }
70
clean_up(void)71 static future_t *clean_up(void) {
72 pthread_mutex_destroy(&gIdxLock);
73 return NULL;
74 }
75
76 const module_t bt_utils_module = {
77 .name = BT_UTILS_MODULE,
78 .init = init,
79 .start_up = NULL,
80 .shut_down = NULL,
81 .clean_up = clean_up,
82 .dependencies = {
83 NULL
84 }
85 };
86
87
88 /*****************************************************************************
89 **
90 ** Function check_do_scheduling_group
91 **
92 ** Description check if it is ok to change schedule group
93 **
94 ** Returns void
95 **
96 *******************************************************************************/
check_do_scheduling_group(void)97 static void check_do_scheduling_group(void) {
98 char buf[PROPERTY_VALUE_MAX];
99 int len = property_get("debug.sys.noschedgroups", buf, "");
100 if (len > 0) {
101 int temp;
102 if (sscanf(buf, "%d", &temp) == 1) {
103 g_DoSchedulingGroup[g_TaskIdx] = temp == 0;
104 }
105 }
106 }
107
108 /*****************************************************************************
109 **
110 ** Function raise_priority_a2dp
111 **
112 ** Description Raise task priority for A2DP streaming
113 **
114 ** Returns void
115 **
116 *******************************************************************************/
raise_priority_a2dp(tHIGH_PRIORITY_TASK high_task)117 void raise_priority_a2dp(tHIGH_PRIORITY_TASK high_task) {
118 int rc = 0;
119 int tid = gettid();
120 int priority = ANDROID_PRIORITY_AUDIO;
121
122 pthread_mutex_lock(&gIdxLock);
123 g_TaskIdx = high_task;
124
125 pthread_once(&g_DoSchedulingGroupOnce[g_TaskIdx], check_do_scheduling_group);
126 if (g_DoSchedulingGroup[g_TaskIdx]) {
127 // set_sched_policy does not support tid == 0
128 rc = set_sched_policy(tid, SP_AUDIO_SYS);
129 }
130 g_TaskIDs[high_task] = tid;
131 pthread_mutex_unlock(&gIdxLock);
132
133 if (rc) {
134 LOG_WARN("failed to change sched policy, tid %d, err: %d", tid, errno);
135 }
136
137 // always use urgent priority for HCI worker thread until we can adjust
138 // its prio individually. All other threads can be dynamically adjusted voa
139 // adjust_priority_a2dp()
140
141 if (high_task == TASK_HIGH_HCI_WORKER)
142 priority = ANDROID_PRIORITY_URGENT_AUDIO;
143
144 if (setpriority(PRIO_PROCESS, tid, priority) < 0) {
145 LOG_WARN("failed to change priority tid: %d to %d", tid, priority);
146 }
147 }
148
149 /*****************************************************************************
150 **
151 ** Function adjust_priority_a2dp
152 **
153 ** Description increase the a2dp consumer task priority temporarily when start
154 ** audio playing, to avoid overflow the audio packet queue, restore
155 ** the a2dp consumer task priority when stop audio playing.
156 **
157 ** Returns void
158 **
159 *******************************************************************************/
adjust_priority_a2dp(int start)160 void adjust_priority_a2dp(int start) {
161 int priority = start ? ANDROID_PRIORITY_URGENT_AUDIO : ANDROID_PRIORITY_AUDIO;
162 int tid;
163 int i;
164
165 for (i = 0; i < TASK_HIGH_MAX; i++)
166 {
167 tid = g_TaskIDs[i];
168 if (tid != INVALID_TASK_ID)
169 {
170 if (setpriority(PRIO_PROCESS, tid, priority) < 0)
171 {
172 LOG_WARN("failed to change priority tid: %d to %d", tid, priority);
173 }
174 }
175 }
176 }
177