[GPU Service] Separate GPU Service out of SurfaceFlinger.

Historically GPU service lives in SurfaceFlinger because it's a convenient
hack. This patch separates GPU service out of SurfaceFlinger. The GPU service
is a service that accesses to GPU, queries GPU capabilities and reports back.

Minor: Replace Vector with std::vector.

BUG: 118347356
Test: Build, flash and boot, `adb shell cmd gpuservice vkjson` to verify
Change-Id: If8feedc0a58bcd3c2e4111f8997117a618f5a516
Merged-In: If8feedc0a58bcd3c2e4111f8997117a618f5a516
diff --git a/services/gpuservice/Android.bp b/services/gpuservice/Android.bp
new file mode 100644
index 0000000..250bbee
--- /dev/null
+++ b/services/gpuservice/Android.bp
@@ -0,0 +1,74 @@
+filegroup {
+    name: "gpuservice_sources",
+    srcs: [
+        "GpuService.cpp",
+    ],
+}
+
+filegroup {
+    name: "gpuservice_binary_sources",
+    srcs: ["main_gpuservice.cpp"],
+}
+
+cc_defaults {
+    name: "gpuservice_defaults",
+    cflags: [
+        "-DLOG_TAG=\"GpuService\"",
+        "-Wall",
+        "-Werror",
+        "-Wformat",
+        "-Wthread-safety",
+        "-Wunused",
+        "-Wunreachable-code",
+    ],
+    cppflags: ["-std=c++1z"],
+    srcs: [
+        ":gpuservice_sources",
+    ],
+    include_dirs: [
+        "frameworks/native/vulkan/vkjson",
+        "frameworks/native/vulkan/include",
+    ],
+    shared_libs: [
+        "libbinder",
+        "liblog",
+        "libutils",
+        "libvulkan",
+    ],
+    static_libs: [
+        "libvkjson",
+    ],
+}
+
+cc_defaults {
+    name: "gpuservice_production_defaults",
+    defaults: ["gpuservice_defaults"],
+    cflags: [
+        "-fvisibility=hidden",
+        "-fwhole-program-vtables", // requires ThinLTO
+    ],
+    lto: {
+        thin: true,
+    },
+}
+
+cc_defaults {
+    name: "gpuservice_binary",
+    defaults: ["gpuservice_defaults"],
+    whole_static_libs: [
+        "libsigchain",
+    ],
+    shared_libs: [
+        "libbinder",
+        "liblog",
+        "libutils",
+    ],
+    ldflags: ["-Wl,--export-dynamic"],
+}
+
+cc_binary {
+    name: "gpuservice",
+    defaults: ["gpuservice_binary"],
+    init_rc: ["gpuservice.rc"],
+    srcs: [":gpuservice_binary_sources"],
+}
diff --git a/services/gpuservice/GpuService.cpp b/services/gpuservice/GpuService.cpp
new file mode 100644
index 0000000..e4ca6bc
--- /dev/null
+++ b/services/gpuservice/GpuService.cpp
@@ -0,0 +1,122 @@
+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * 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 "GpuService.h"
+
+#include <binder/IResultReceiver.h>
+#include <binder/Parcel.h>
+#include <utils/String8.h>
+#include <vkjson.h>
+
+namespace android {
+
+class BpGpuService : public BpInterface<IGpuService> {
+public:
+    explicit BpGpuService(const sp<IBinder>& impl) : BpInterface<IGpuService>(impl) {}
+};
+
+IMPLEMENT_META_INTERFACE(GpuService, "android.ui.IGpuService");
+
+status_t BnGpuService::onTransact(uint32_t code, const Parcel& data,
+        Parcel* reply, uint32_t flags) {
+    status_t status;
+    switch (code) {
+    case SHELL_COMMAND_TRANSACTION: {
+        int in = data.readFileDescriptor();
+        int out = data.readFileDescriptor();
+        int err = data.readFileDescriptor();
+        std::vector<String16> args;
+        data.readString16Vector(&args);
+        sp<IBinder> unusedCallback;
+        sp<IResultReceiver> resultReceiver;
+        if ((status = data.readNullableStrongBinder(&unusedCallback)) != OK)
+            return status;
+        if ((status = data.readNullableStrongBinder(&resultReceiver)) != OK)
+            return status;
+        status = shellCommand(in, out, err, args);
+        if (resultReceiver != nullptr)
+            resultReceiver->send(status);
+        return OK;
+    }
+
+    default:
+        return BBinder::onTransact(code, data, reply, flags);
+    }
+}
+
+namespace {
+    status_t cmd_help(int out);
+    status_t cmd_vkjson(int out, int err);
+}
+
+const char* const GpuService::SERVICE_NAME = "gpuservice";
+
+GpuService::GpuService() = default;
+
+status_t GpuService::shellCommand(int /*in*/, int out, int err,
+                                  std::vector<String16>& args) {
+    ALOGV("GpuService::shellCommand");
+    for (size_t i = 0, n = args.size(); i < n; i++)
+        ALOGV("  arg[%zu]: '%s'", i, String8(args[i]).string());
+
+    if (args.size() >= 1) {
+        if (args[0] == String16("vkjson"))
+            return cmd_vkjson(out, err);
+        if (args[0] == String16("help"))
+            return cmd_help(out);
+    }
+    // no command, or unrecognized command
+    cmd_help(err);
+    return BAD_VALUE;
+}
+
+namespace {
+
+status_t cmd_help(int out) {
+    FILE* outs = fdopen(out, "w");
+    if (!outs) {
+        ALOGE("vkjson: failed to create out stream: %s (%d)", strerror(errno),
+            errno);
+        return BAD_VALUE;
+    }
+    fprintf(outs,
+        "GPU Service commands:\n"
+        "  vkjson   dump Vulkan properties as JSON\n");
+    fclose(outs);
+    return NO_ERROR;
+}
+
+void vkjsonPrint(FILE* out) {
+    std::string json = VkJsonInstanceToJson(VkJsonGetInstance());
+    fwrite(json.data(), 1, json.size(), out);
+    fputc('\n', out);
+}
+
+status_t cmd_vkjson(int out, int /*err*/) {
+    FILE* outs = fdopen(out, "w");
+    if (!outs) {
+        int errnum = errno;
+        ALOGE("vkjson: failed to create output stream: %s", strerror(errnum));
+        return -errnum;
+    }
+    vkjsonPrint(outs);
+    fclose(outs);
+    return NO_ERROR;
+}
+
+} // anonymous namespace
+
+} // namespace android
diff --git a/services/gpuservice/GpuService.h b/services/gpuservice/GpuService.h
new file mode 100644
index 0000000..e2b396e
--- /dev/null
+++ b/services/gpuservice/GpuService.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2016 The Android Open Source Project
+ *
+ * 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 ANDROID_GPUSERVICE_H
+#define ANDROID_GPUSERVICE_H
+
+#include <vector>
+
+#include <binder/IInterface.h>
+#include <cutils/compiler.h>
+
+namespace android {
+
+/*
+ * This class defines the Binder IPC interface for GPU-related queries and
+ * control.
+ */
+class IGpuService : public IInterface {
+public:
+    DECLARE_META_INTERFACE(GpuService);
+};
+
+class BnGpuService: public BnInterface<IGpuService> {
+protected:
+    virtual status_t shellCommand(int in, int out, int err,
+                                  std::vector<String16>& args) = 0;
+
+    status_t onTransact(uint32_t code, const Parcel& data,
+            Parcel* reply, uint32_t flags = 0) override;
+};
+
+class GpuService : public BnGpuService {
+public:
+    static const char* const SERVICE_NAME ANDROID_API;
+
+    GpuService() ANDROID_API;
+
+protected:
+    status_t shellCommand(int in, int out, int err,
+                          std::vector<String16>& args) override;
+};
+
+} // namespace android
+
+#endif // ANDROID_GPUSERVICE_H
diff --git a/services/gpuservice/gpuservice.rc b/services/gpuservice/gpuservice.rc
new file mode 100644
index 0000000..d23cf46
--- /dev/null
+++ b/services/gpuservice/gpuservice.rc
@@ -0,0 +1,4 @@
+service gpuservice /system/bin/gpuservice
+    class core
+    user gpu_service
+    group graphics
diff --git a/services/gpuservice/main_gpuservice.cpp b/services/gpuservice/main_gpuservice.cpp
new file mode 100644
index 0000000..64aafca
--- /dev/null
+++ b/services/gpuservice/main_gpuservice.cpp
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2018 The Android Open Source Project
+ *
+ * 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/IPCThreadState.h>
+#include <binder/IServiceManager.h>
+#include <binder/ProcessState.h>
+#include <sys/resource.h>
+#include "GpuService.h"
+
+using namespace android;
+
+int main(int /* argc */, char** /* argv */) {
+    signal(SIGPIPE, SIG_IGN);
+
+    // publish GpuService
+    sp<GpuService> gpuservice = new GpuService();
+    sp<IServiceManager> sm(defaultServiceManager());
+    sm->addService(String16(GpuService::SERVICE_NAME), gpuservice, false);
+
+    // limit the number of binder threads to 4.
+    ProcessState::self()->setThreadPoolMaxThreadCount(4);
+
+    // start the thread pool
+    sp<ProcessState> ps(ProcessState::self());
+    ps->startThreadPool();
+    ps->giveThreadPoolName();
+    IPCThreadState::self()->joinThreadPool();
+
+    return 0;
+}