Bump up priority of a few tasks that could affect a2dp

Change nice to -16, same as android audio service. Affected tasks: btu,
gki timer, hci worker, media task, userial_read
bug 7267756

Change-Id: I0b5ecc4345240601ef6e5890240054dab193e4a0

3 files changed, 201 insertions, 0 deletions

diff --git a/utils/Android.mk b/utils/Android.mk
new file mode 100644
index 0000000..4e66705
--- /dev/null
+++ b/utils/Android.mk
@@ -0,0 +1,20 @@
+LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+
+LOCAL_C_INCLUDES:= $(LOCAL_PATH)/include \
+                   $(LOCAL_PATH)/../gki/ulinux \
+                   $(bdroid_C_INCLUDES)
+
+LOCAL_CFLAGS += -Werror $(bdroid_CFLAGS)
+
+LOCAL_PRELINK_MODULE:=false
+LOCAL_SRC_FILES:= \
+    ./src/bt_utils.c
+
+LOCAL_MODULE := libbt-utils
+LOCAL_MODULE_TAGS := optional
+LOCAL_SHARED_LIBRARIES := libcutils libc
+LOCAL_MODULE_CLASS := SHARED_LIBRARIES
+
+include $(BUILD_SHARED_LIBRARY)
diff --git a/utils/include/bt_utils.h b/utils/include/bt_utils.h
new file mode 100644
index 0000000..ef4fc18
--- /dev/null
+++ b/utils/include/bt_utils.h
@@ -0,0 +1,42 @@
+/******************************************************************************
+ *
+ *  Copyright (C) 2009-2012 Broadcom Corporation
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at:
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ ******************************************************************************/
+
+#ifndef BT_UTILS_H
+#define BT_UTILS_H
+
+/*******************************************************************************
+**  Type definitions
+********************************************************************************/
+
+typedef enum {
+    TASK_HIGH_MEDIA = 0,
+    TASK_HIGH_GKI_TIMER,
+    TASK_HIGH_BTU,
+    TASK_HIGH_HCI_WORKER,
+    TASK_HIGH_MAX
+} tHIGH_PRIORITY_TASK;
+
+/*******************************************************************************
+**  Functions
+********************************************************************************/
+
+void bt_utils_init();
+void bt_utils_cleanup();
+void raise_priority_a2dp(tHIGH_PRIORITY_TASK high_task);
+
+#endif /* BT_UTILS_H */
diff --git a/utils/src/bt_utils.c b/utils/src/bt_utils.c
new file mode 100644
index 0000000..aeb9292
--- /dev/null
+++ b/utils/src/bt_utils.c
@@ -0,0 +1,139 @@
+/******************************************************************************
+ *
+ *  Copyright (C) 2012 Broadcom Corporation
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at:
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ ******************************************************************************/
+
+/************************************************************************************
+ *
+ *  Filename:      bt_utils.c
+ *
+ *  Description:   Miscellaneous helper functions
+ *
+ *
+ ***********************************************************************************/
+
+#include <cutils/properties.h>
+#include <cutils/sched_policy.h>
+#include <errno.h>
+#include <pthread.h>
+#include <sys/resource.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <utils/ThreadDefs.h>
+
+#define LOG_TAG "BT_UTILS"
+
+#include <utils/Log.h>
+
+#include "data_types.h"
+#include "bt_utils.h"
+
+
+/*******************************************************************************
+**  Type definitions for callback functions
+********************************************************************************/
+static pthread_once_t g_DoSchedulingGroupOnce[TASK_HIGH_MAX];
+static BOOLEAN g_DoSchedulingGroup[TASK_HIGH_MAX];
+static pthread_mutex_t         gIdxLock;
+static int g_TaskIdx;
+
+/*****************************************************************************
+**
+** Function        bt_utils_init
+**
+** Description     Initialize bluedroid util
+**
+** Returns         void
+**
+*******************************************************************************/
+void bt_utils_init() {
+    int i;
+    pthread_mutexattr_t lock_attr;
+
+    for(i = 0; i < TASK_HIGH_MAX; i++) {
+        g_DoSchedulingGroupOnce[i] = PTHREAD_ONCE_INIT;
+        g_DoSchedulingGroup[i] = TRUE;
+    }
+    pthread_mutexattr_init(&lock_attr);
+    pthread_mutex_init(&gIdxLock, &lock_attr);
+}
+
+/*****************************************************************************
+**
+** Function        bt_utils_cleanup
+**
+** Description     Clean up bluedroid util
+**
+** Returns         void
+**
+*******************************************************************************/
+void bt_utils_cleanup() {
+    pthread_mutex_destroy(&gIdxLock);
+}
+
+/*****************************************************************************
+**
+** Function        check_do_scheduling_group
+**
+** Description     check if it is ok to change schedule group
+**
+** Returns         void
+**
+*******************************************************************************/
+static void check_do_scheduling_group(void) {
+    char buf[PROPERTY_VALUE_MAX];
+    int len = property_get("debug.sys.noschedgroups", buf, "");
+    if (len > 0) {
+        int temp;
+        if (sscanf(buf, "%d", &temp) == 1) {
+            g_DoSchedulingGroup[g_TaskIdx] = temp == 0;
+        }
+    }
+}
+
+/*****************************************************************************
+**
+** Function        raise_priority_a2dp
+**
+** Description     Raise task priority for A2DP streaming
+**
+** Returns         void
+**
+*******************************************************************************/
+void raise_priority_a2dp(tHIGH_PRIORITY_TASK high_task) {
+    int rc = 0;
+    int tid = gettid();
+
+    pthread_mutex_lock(&gIdxLock);
+    g_TaskIdx = high_task;
+
+    pthread_once(&g_DoSchedulingGroupOnce[g_TaskIdx], check_do_scheduling_group);
+    if (g_DoSchedulingGroup[g_TaskIdx]) {
+        // set_sched_policy does not support tid == 0
+        rc = set_sched_policy(tid, SP_FOREGROUND);
+    }
+    pthread_mutex_unlock(&gIdxLock);
+
+    if (rc) {
+        ALOGW("failed to change sched policy, tid %d, err: %d", tid, errno);
+    }
+
+    if (setpriority(PRIO_PROCESS, tid, ANDROID_PRIORITY_AUDIO) < 0) {
+        ALOGW("failed to change priority tid: %d to %d", tid, ANDROID_PRIORITY_AUDIO);
+    }
+}
+