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// Copyright 2020 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <fuchsia/hardware/goldfish/pipe/cpp/banjo.h>
#include <lib/ddk/debug.h>
#include <lib/ddk/driver.h>
#include <lib/zx/event.h>
#include <zircon/errors.h>
#include <zircon/syscalls.h>
#include <zircon/types.h>
#include <memory>
#include <unordered_set>
#include <ddktl/device.h>
#include "src/devices/bus/drivers/platform/test/test-goldfish-pipe-bind.h"
#define DRIVER_NAME "test-goldfish-pipe"
#define GOLDFISH_TEST_HEAP (0x100000000000fffful)
namespace goldfish {
namespace pipe {
namespace {
zx_status_t CheckHandle(const zx::object_base& object, zx_obj_type_t obj_type) {
if (!object.is_valid()) {
zx_info_handle_basic_t handle_info;
zx_status_t status =
object.get_info(ZX_INFO_HANDLE_BASIC, &handle_info, sizeof(handle_info), nullptr, nullptr);
if (status != ZX_OK) {
return status;
if (handle_info.type != obj_type) {
return ZX_OK;
} // namespace
class TestGoldfishPipeDevice;
using DeviceType = ddk::Device<TestGoldfishPipeDevice>;
class TestGoldfishPipeDevice
: public DeviceType,
public ddk::GoldfishPipeProtocol<TestGoldfishPipeDevice, ddk::base_protocol> {
static zx_status_t Create(zx_device_t* parent);
explicit TestGoldfishPipeDevice(zx_device_t* parent) : DeviceType(parent) {}
zx_status_t Create(std::unique_ptr<TestGoldfishPipeDevice>* out);
// Methods required by the ddk mixins
void DdkRelease();
// |fuchsia.hardware.goldfish.pipe.GoldfishPipe|
zx_status_t GoldfishPipeCreate(int32_t* out_id, zx::vmo* out_vmo);
zx_status_t GoldfishPipeSetEvent(int32_t id, zx::event pipe_event);
void GoldfishPipeDestroy(int32_t id);
void GoldfishPipeOpen(int32_t id);
void GoldfishPipeExec(int32_t id);
zx_status_t GoldfishPipeGetBti(zx::bti* out_bti);
zx_status_t GoldfishPipeConnectSysmem(zx::channel connection);
zx_status_t GoldfishPipeRegisterSysmemHeap(uint64_t heap, zx::channel connection);
int32_t next_id_ = 0u;
std::unordered_set<int32_t> ids_;
zx_status_t TestGoldfishPipeDevice::Create(zx_device_t* parent) {
auto dev = std::make_unique<TestGoldfishPipeDevice>(parent);
zxlogf(INFO, "TestGoldfishPipeDevice::Create: %s", DRIVER_NAME);
auto status = dev->DdkAdd(DRIVER_NAME);
if (status != ZX_OK) {
zxlogf(ERROR, "%s: DdkAdd failed: %d", __func__, status);
return status;
__UNUSED auto ptr = dev.release();
return ZX_OK;
void TestGoldfishPipeDevice::DdkRelease() { delete this; }
zx_status_t TestGoldfishPipeDevice::GoldfishPipeCreate(int32_t* out_id, zx::vmo* out_vmo) {
zxlogf(INFO, "TestGoldfishPipeDevice::%s", __func__);
zx_status_t status = zx::vmo::create(/*size=*/65536, /*options=*/0u, out_vmo);
if (status != ZX_OK) {
zxlogf(ERROR, "%s zx_vmo_create failed %d", __func__, status);
return status;
*out_id = next_id_++;
return ZX_OK;
zx_status_t TestGoldfishPipeDevice::GoldfishPipeSetEvent(int32_t id, zx::event pipe_event) {
zxlogf(INFO, "TestGoldfishPipeDevice::%s id = %d pipe_event = %u", __func__, id,
if (ids_.find(id) == ids_.end()) {
return CheckHandle(pipe_event, ZX_OBJ_TYPE_EVENT);
void TestGoldfishPipeDevice::GoldfishPipeDestroy(int32_t id) {
zxlogf(INFO, "TestGoldfishPipeDevice::%s id = %d", __func__, id);
void TestGoldfishPipeDevice::GoldfishPipeOpen(int32_t id) {
zxlogf(INFO, "TestGoldfishPipeDevice::%s id = %d", __func__, id);
ZX_ASSERT(ids_.find(id) != ids_.end());
void TestGoldfishPipeDevice::GoldfishPipeExec(int32_t id) {
zxlogf(INFO, "TestGoldfishPipeDevice::%s id = %d", __func__, id);
ZX_ASSERT(ids_.find(id) != ids_.end());
zx_status_t TestGoldfishPipeDevice::GoldfishPipeGetBti(zx::bti* out_bti) {
zxlogf(INFO, "TestGoldfishPipeDevice::%s", __func__);
// We don't have a good way to create a BTI on the test board
// (fake BTIs don't work when crossing process boundaries), so
// we just return a non-BTI handle for GetBti() method to make
// this fake device work.
zx::event dummy_event;
zx_status_t status = zx::event::create(0u, &dummy_event);
if (status != ZX_OK) {
return status;
return ZX_OK;
zx_status_t TestGoldfishPipeDevice::GoldfishPipeConnectSysmem(zx::channel connection) {
zxlogf(INFO, "TestGoldfishPipeDevice::%s connection = %u", __func__, connection.get());
return CheckHandle(connection, ZX_OBJ_TYPE_CHANNEL);
zx_status_t TestGoldfishPipeDevice::GoldfishPipeRegisterSysmemHeap(uint64_t heap,
zx::channel connection) {
zxlogf(INFO, "TestGoldfishPipeDevice::%s heap = %lu connection = %u", __func__, heap,
if (heap != GOLDFISH_TEST_HEAP) {
return CheckHandle(connection, ZX_OBJ_TYPE_CHANNEL);
zx_status_t test_goldfish_pipe_bind(void* ctx, zx_device_t* parent) {
return TestGoldfishPipeDevice::Create(parent);
constexpr zx_driver_ops_t driver_ops = []() {
zx_driver_ops_t driver_ops = {};
driver_ops.version = DRIVER_OPS_VERSION;
driver_ops.bind = test_goldfish_pipe_bind;
return driver_ops;
} // namespace pipe
} // namespace goldfish
ZIRCON_DRIVER(test_goldfish_pipe, goldfish::pipe::driver_ops, "zircon", "0.1");