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// Copyright 2018 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 "ui/ozone/platform/wayland/common/drm_render_node_path_finder.h"
#include <fcntl.h>
#include <gbm.h>
#include <xf86drm.h>
#include <string>
#include <vector>
#include "base/command_line.h"
#include "base/files/scoped_file.h"
#include "base/logging.h"
#include "ui/gfx/linux/scoped_gbm_device.h" // nogncheck
#include "ui/gl/startup_trace.h"
#include "ui/ozone/public/ozone_switches.h"
namespace ui {
DrmRenderNodePathFinder::DrmRenderNodePathFinder() {
FindDrmRenderNodePath();
}
DrmRenderNodePathFinder::~DrmRenderNodePathFinder() = default;
base::FilePath DrmRenderNodePathFinder::GetDrmRenderNodePath() const {
return drm_render_node_path_;
}
void DrmRenderNodePathFinder::FindDrmRenderNodePath() {
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kRenderNodeOverride)) {
drm_render_node_path_ =
base::CommandLine::ForCurrentProcess()->GetSwitchValuePath(
switches::kRenderNodeOverride);
return;
}
int max_devices = drmGetDevices2(0, nullptr, 0);
if (max_devices <= 0) {
PLOG(ERROR) << "drmGetDevices2() has not found any devices";
return;
}
std::vector<drmDevicePtr> devices{static_cast<size_t>(max_devices), nullptr};
int ret = drmGetDevices2(0, devices.data(), max_devices);
if (ret < 0) {
PLOG(ERROR) << "drmGetDevices2() returned an error";
return;
}
std::vector<std::pair<std::string, std::string>> driver_to_nodes;
for (const auto& device : devices) {
if (!device || !(device->available_nodes & 1 << DRM_NODE_RENDER)) {
continue;
}
CHECK(device->nodes);
const std::string dri_render_node(device->nodes[DRM_NODE_RENDER]);
base::ScopedFD drm_fd(open(dri_render_node.c_str(), O_RDWR));
if (drm_fd.get() < 0) {
continue;
}
drmVersionPtr version = drmGetVersion(drm_fd.get());
if (!version) {
continue;
}
const std::string driver_name(version->name, version->name_len);
drmFreeVersion(version);
// Skip if this is the vgem render node.
if (driver_name == "vgem") {
continue;
}
// In case the first node /dev/dri/renderD128 can be opened but fails to
// create gbm device on certain driver (E.g. PowerVR). Skip such paths.
{
GPU_STARTUP_TRACE_EVENT("scoped attempt of gbm_create_device");
ScopedGbmDevice gbm_device(gbm_create_device(drm_fd.get()));
if (!gbm_device) {
continue;
}
}
driver_to_nodes.emplace_back(driver_name, dri_render_node);
}
drmFreeDevices(devices.data(), max_devices);
devices.clear();
if (driver_to_nodes.empty()) {
return;
}
static constexpr const char* preferred_drivers[3] = {"i915", "amdgpu",
"virtio_gpu"};
for (const char* preferred_driver : preferred_drivers) {
for (const auto& [driver, node] : driver_to_nodes) {
if (driver == preferred_driver) {
drm_render_node_path_ = base::FilePath(node);
return;
}
}
}
LOG(WARNING) << "Preferred drm_render_node not found, picking "
<< driver_to_nodes[0].first;
drm_render_node_path_ = base::FilePath(driver_to_nodes[0].second);
}
} // namespace ui
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