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gonksched.cpp
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/*
* Copyright (C) 2012-2014 Mozilla Foundation
*
* 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.
*/
#include <binder/BinderService.h>
#include <binder/IPCThreadState.h>
#include <binder/ProcessState.h>
#include <binder/IServiceManager.h>
#include <ISchedulingPolicyService.h>
#include <cutils/sched_policy.h>
#include <private/android_filesystem_config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
namespace android {
class GonkSchedulePolicyService :
public BinderService<GonkSchedulePolicyService>,
public BnSchedulingPolicyService
{
public:
GonkSchedulePolicyService();
virtual ~GonkSchedulePolicyService();
static const char *getServiceName() { return "scheduling_policy"; }
virtual status_t dump(int fd, const Vector<String16>& args);
int requestPriority(int32_t pid, int32_t tid, int32_t prio);
#if ANDROID_VERSION >= 29
virtual int requestPriority(int32_t pid, int32_t tid,
int32_t prio, bool isForApp, bool asynchronous);
virtual int requestCpusetBoost(bool enable, const sp<IInterface>& client);
#else
virtual int requestPriority(int32_t pid, int32_t tid, int32_t prio, bool async);
#endif
virtual status_t onTransact(uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags);
};
GonkSchedulePolicyService::GonkSchedulePolicyService()
: BnSchedulingPolicyService()
{
}
GonkSchedulePolicyService::~GonkSchedulePolicyService()
{
}
status_t
GonkSchedulePolicyService::dump(int fd, const Vector<String16>& args)
{
(void)fd;
(void)args;
return NO_ERROR;
}
static bool tidBelongsToPid(int32_t tid, int32_t pid)
{
if (tid == pid)
return true;
char filename[64];
snprintf(filename, sizeof(filename), "/proc/%d/task/%d/status", pid, tid);
return !access(filename, F_OK);
}
int
GonkSchedulePolicyService::requestPriority(int32_t pid, int32_t tid, int32_t prio)
{
// See SchedulingPolicyService.java
#define PRIORITY_MIN 1
#define PRIORITY_MAX 3
IPCThreadState* ipcState = IPCThreadState::self();
if (ipcState->getCallingUid() != AID_MEDIA ||
prio < PRIORITY_MIN || prio > PRIORITY_MAX ||
!tidBelongsToPid(tid, pid))
return -EPERM; /* PackageManager.PERMISSION_DENIED */
set_sched_policy(tid, ipcState->getCallingPid() == pid ?
SP_AUDIO_SYS : SP_AUDIO_APP);
struct sched_param param;
param.sched_priority = prio;
int rc = sched_setscheduler(tid, SCHED_FIFO, ¶m);
if (rc)
return -EPERM;
return NO_ERROR; /* PackageManger.PERMISSION_GRANTED */
}
#if ANDROID_VERSION >= 29
int
GonkSchedulePolicyService::requestPriority(int32_t pid, int32_t tid, int32_t prio,
bool isForApp, bool asynchronous)
{
(void)isForApp;
(void)asynchronous;
return requestPriority(pid, tid, prio);
}
int
GonkSchedulePolicyService::requestCpusetBoost(bool enable, const sp<IInterface>& client)
{
(void)enable;
(void)client;
return NO_ERROR;
}
#else
int
GonkSchedulePolicyService::requestPriority(int32_t pid, int32_t tid, int32_t prio, bool async)
{
(void)async;
return requestPriority(pid, tid, prio);
}
#endif
enum {
REQUEST_PRIORITY_TRANSACTION = IBinder::FIRST_CALL_TRANSACTION,
};
status_t
GonkSchedulePolicyService::onTransact(uint32_t code, const Parcel& data, Parcel* reply, uint32_t flags)
{
switch (code) {
case REQUEST_PRIORITY_TRANSACTION: {
CHECK_INTERFACE(ISchedulePolicyService, data, reply);
int32_t pid = data.readInt32();
int32_t tid = data.readInt32();
int32_t prio = data.readInt32();
#if ANDROID_VERSION >= 29
data.readBool();
#endif
status_t result = requestPriority(pid, tid, prio);
reply->writeNoException();
reply->writeInt32(result);
return NO_ERROR;
break;
}
default:
return BBinder::onTransact(code, data, reply, flags);
}
}
}; // namespace android
using namespace android;
int main(int argc, char **argv)
{
(void)argc;
(void)argv;
GonkSchedulePolicyService::publishAndJoinThreadPool(true);
return 0;
}