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// Copyright 2019 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/351564777): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include <wayland-drm-client-protocol.h>
#include <fcntl.h>
#include <xf86drm.h>
#include "base/files/scoped_file.h"
#include "base/logging.h"
#include "ui/gfx/buffer_format_util.h"
#include "ui/gfx/linux/drm_util_linux.h"
#include "ui/ozone/platform/wayland/host/wayland_buffer_factory.h"
#include "ui/ozone/platform/wayland/host/wayland_connection.h"
#include "ui/ozone/platform/wayland/host/wayland_drm.h"
#include "wayland-util.h"
namespace ui {
namespace {
constexpr uint32_t kMinVersion = 2;
}
// static
constexpr char WaylandDrm::kInterfaceName[];
// static
void WaylandDrm::Instantiate(WaylandConnection* connection,
wl_registry* registry,
uint32_t name,
const std::string& interface,
uint32_t version) {
CHECK_EQ(interface, kInterfaceName) << "Expected \"" << kInterfaceName
<< "\" but got \"" << interface << "\"";
auto* buffer_factory = connection->buffer_factory();
if (buffer_factory->wayland_drm_ ||
!wl::CanBind(interface, version, kMinVersion, kMinVersion)) {
return;
}
auto wl_obj = wl::Bind<wl_drm>(registry, name, version);
if (!wl_obj) {
LOG(ERROR) << "Failed to bind wl_drm";
return;
}
buffer_factory->wayland_drm_ =
std::make_unique<WaylandDrm>(wl_obj.release(), connection);
}
WaylandDrm::WaylandDrm(wl_drm* drm, WaylandConnection* connection)
: wl_drm_(drm), connection_(connection) {
static constexpr wl_drm_listener kDrmListener = {
.device = &OnDevice,
.format = &OnFormat,
.authenticated = &OnAuthenticated,
.capabilities = &OnCapabilities,
};
wl_drm_add_listener(wl_drm_.get(), &kDrmListener, this);
connection_->Flush();
// A roundtrip after binding guarantees that the client has received all
// supported formats and capabilities of the device.
connection_->RoundTripQueue();
}
WaylandDrm::~WaylandDrm() = default;
bool WaylandDrm::SupportsDrmPrime() const {
return authenticated_ && !!wl_drm_;
}
void WaylandDrm::CreateBuffer(const base::ScopedFD& fd,
const gfx::Size& size,
const std::vector<uint32_t>& strides,
const std::vector<uint32_t>& offsets,
const std::vector<uint64_t>& modifiers,
uint32_t format,
uint32_t planes_count,
wl::OnRequestBufferCallback callback) {
// If the |planes_count| less than the maximum sizes of these arrays and the
// number of offsets and strides that |wl_drm| can receive, just initialize
// them to 0, which is totally ok.
std::array<uint32_t, 3> stride = {0};
std::array<uint32_t, 3> offset = {0};
for (size_t i = 0; i < planes_count; i++) {
stride[i] = strides[i];
offset[i] = offset[i];
}
wl::Object<wl_buffer> buffer(wl_drm_create_prime_buffer(
wl_drm_.get(), fd.get(), size.width(), size.height(), format, offset[0],
stride[0], offset[1], stride[1], offset[2], stride[2]));
connection_->Flush();
std::move(callback).Run(std::move(buffer));
}
bool WaylandDrm::CanCreateBufferImmed() const {
// Unlike the WaylandZwpLinuxDmabuf, the WaylandDrm always creates wl_buffers
// immediately.
return true;
}
void WaylandDrm::HandleDrmFailure(const std::string& error) {
LOG(WARNING) << error;
wl_drm_.reset();
}
void WaylandDrm::AddSupportedFourCCFormat(uint32_t fourcc_format) {
// Return on unsupported fourcc formats.
if (!IsValidBufferFormat(fourcc_format))
return;
gfx::BufferFormat format = GetBufferFormatFromFourCCFormat(fourcc_format);
// Modifiers are not supported by the |wl_drm|, but for consistency with the
// WaylandZwpLinuxDmabuf we use the same map type, which is passed to the
// WaylandBufferManagerGpu later during initialization stage of the GPU
// process.
std::vector<uint64_t> modifiers;
supported_buffer_formats_.emplace(format, std::move(modifiers));
}
void WaylandDrm::Authenticate(const char* drm_device_path) {
if (!wl_drm_)
return;
DCHECK(drm_device_path);
base::ScopedFD drm_fd(open(drm_device_path, O_RDWR));
if (!drm_fd.is_valid()) {
HandleDrmFailure("Drm open failed: " + std::string(drm_device_path));
return;
}
if (drmGetNodeTypeFromFd(drm_fd.get()) != DRM_NODE_PRIMARY) {
DrmDeviceAuthenticated(wl_drm_.get());
return;
}
drm_magic_t magic;
memset(&magic, 0, sizeof(magic));
if (drmGetMagic(drm_fd.get(), &magic)) {
HandleDrmFailure("Failed to get drm magic");
return;
}
wl_drm_authenticate(wl_drm_.get(), magic);
connection_->Flush();
// Do the roundtrip to make sure the server processes this request and
// authenticates us.
connection_->RoundTripQueue();
}
void WaylandDrm::DrmDeviceAuthenticated(wl_drm* drm) {
DCHECK(wl_drm_ && wl_drm_.get() == drm);
authenticated_ = true;
}
void WaylandDrm::HandleCapabilities(uint32_t value) {
if ((value & WL_DRM_CAPABILITY_PRIME) == 0) {
HandleDrmFailure("Drm prime capability is not supported");
}
}
// static
void WaylandDrm::OnDevice(void* data, wl_drm* drm, const char* path) {
auto* self = static_cast<WaylandDrm*>(data);
DCHECK(self && self->wl_drm_.get() == drm);
self->Authenticate(path);
}
// static
void WaylandDrm::OnFormat(void* data, wl_drm* drm, uint32_t format) {
auto* self = static_cast<WaylandDrm*>(data);
DCHECK(self && self->wl_drm_.get() == drm);
self->AddSupportedFourCCFormat(format);
}
// static
void WaylandDrm::OnAuthenticated(void* data, wl_drm* drm) {
auto* self = static_cast<WaylandDrm*>(data);
DCHECK(self);
self->DrmDeviceAuthenticated(drm);
}
// static
void WaylandDrm::OnCapabilities(void* data, wl_drm* drm, uint32_t value) {
auto* self = static_cast<WaylandDrm*>(data);
DCHECK(self && self->wl_drm_.get() == drm);
self->HandleCapabilities(value);
}
} // namespace ui
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