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 #include <cutils/properties.h> 29 #include <cutils/sched_policy.h> 30 #include <errno.h> 31 #include <pthread.h> 32 #include <sys/resource.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <unistd.h> 36 #include <utils/ThreadDefs.h> 37 38 #define LOG_TAG "BT_UTILS" 39 40 #include <utils/Log.h> 41 42 #include "data_types.h" 43 #include "bt_utils.h" 44 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 56 /***************************************************************************** 57 ** 58 ** Function bt_utils_init 59 ** 60 ** Description Initialize bluedroid util 61 ** 62 ** Returns void 63 ** 64 *******************************************************************************/ 65 void bt_utils_init() { 66 int i; 67 pthread_mutexattr_t lock_attr; 68 69 for(i = 0; i < TASK_HIGH_MAX; i++) { 70 g_DoSchedulingGroupOnce[i] = PTHREAD_ONCE_INIT; 71 g_DoSchedulingGroup[i] = TRUE; 72 g_TaskIDs[i] = INVALID_TASK_ID; 73 } 74 pthread_mutexattr_init(&lock_attr); 75 pthread_mutex_init(&gIdxLock, &lock_attr); 76 } 77 78 /***************************************************************************** 79 ** 80 ** Function bt_utils_cleanup 81 ** 82 ** Description Clean up bluedroid util 83 ** 84 ** Returns void 85 ** 86 *******************************************************************************/ 87 void bt_utils_cleanup() { 88 pthread_mutex_destroy(&gIdxLock); 89 } 90 91 /***************************************************************************** 92 ** 93 ** Function check_do_scheduling_group 94 ** 95 ** Description check if it is ok to change schedule group 96 ** 97 ** Returns void 98 ** 99 *******************************************************************************/ 100 static void check_do_scheduling_group(void) { 101 char buf[PROPERTY_VALUE_MAX]; 102 int len = property_get("debug.sys.noschedgroups", buf, ""); 103 if (len > 0) { 104 int temp; 105 if (sscanf(buf, "%d", &temp) == 1) { 106 g_DoSchedulingGroup[g_TaskIdx] = temp == 0; 107 } 108 } 109 } 110 111 /***************************************************************************** 112 ** 113 ** Function raise_priority_a2dp 114 ** 115 ** Description Raise task priority for A2DP streaming 116 ** 117 ** Returns void 118 ** 119 *******************************************************************************/ 120 void raise_priority_a2dp(tHIGH_PRIORITY_TASK high_task) { 121 int rc = 0; 122 int tid = gettid(); 123 int priority = ANDROID_PRIORITY_AUDIO; 124 125 pthread_mutex_lock(&gIdxLock); 126 g_TaskIdx = high_task; 127 128 pthread_once(&g_DoSchedulingGroupOnce[g_TaskIdx], check_do_scheduling_group); 129 if (g_DoSchedulingGroup[g_TaskIdx]) { 130 // set_sched_policy does not support tid == 0 131 rc = set_sched_policy(tid, SP_AUDIO_SYS); 132 } 133 g_TaskIDs[high_task] = tid; 134 pthread_mutex_unlock(&gIdxLock); 135 136 if (rc) { 137 ALOGW("failed to change sched policy, tid %d, err: %d", tid, errno); 138 } 139 140 // always use urgent priority for HCI worker thread until we can adjust 141 // its prio individually. All other threads can be dynamically adjusted voa 142 // adjust_priority_a2dp() 143 144 if (high_task == TASK_HIGH_HCI_WORKER) 145 priority = ANDROID_PRIORITY_URGENT_AUDIO; 146 147 if (setpriority(PRIO_PROCESS, tid, priority) < 0) { 148 ALOGW("failed to change priority tid: %d to %d", tid, priority); 149 } 150 } 151 152 /***************************************************************************** 153 ** 154 ** Function adjust_priority_a2dp 155 ** 156 ** Description increase the a2dp consumer task priority temporarily when start 157 ** audio playing, to avoid overflow the audio packet queue, restore 158 ** the a2dp consumer task priority when stop audio playing. 159 ** 160 ** Returns void 161 ** 162 *******************************************************************************/ 163 void adjust_priority_a2dp(int start) { 164 int priority = start ? ANDROID_PRIORITY_URGENT_AUDIO : ANDROID_PRIORITY_AUDIO; 165 int tid; 166 int i; 167 168 for (i = 0; i < TASK_HIGH_MAX; i++) 169 { 170 tid = g_TaskIDs[i]; 171 if (tid != INVALID_TASK_ID) 172 { 173 if (setpriority(PRIO_PROCESS, tid, priority) < 0) 174 { 175 ALOGW("failed to change priority tid: %d to %d", tid, priority); 176 } 177 } 178 } 179 } 180
