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/*
* Copyright (C) 2025 Igalia S.L.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "WPEDRMDevice.h"
#include "WPEDRMDevicePrivate.h"
#include <wtf/FastMalloc.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/CString.h>
#if USE(LIBDRM)
#include <xf86drm.h>
#endif
/**
* WPEDRMDevice:
*
* Boxed type representing a DRM device.
*/
struct _WPEDRMDevice {
WTF_DEPRECATED_MAKE_STRUCT_FAST_ALLOCATED(_WPEDRMDevice);
_WPEDRMDevice(const char* primaryNode, const char *renderNode)
: primaryNode(primaryNode)
, renderNode(renderNode)
{
}
CString primaryNode;
CString renderNode;
int referenceCount { 1 };
};
G_DEFINE_BOXED_TYPE(WPEDRMDevice, wpe_drm_device, wpe_drm_device_ref, wpe_drm_device_unref)
// If deviceFilename is nullpr, it returns the first device having a render node if found or the first device.
GRefPtr<WPEDRMDevice> wpeDRMDeviceCreateForDevice(const char* deviceFilename)
{
#if USE(LIBDRM)
std::array<drmDevicePtr, 64> devices { };
int numDevices = drmGetDevices2(0, devices.data(), std::size(devices));
if (numDevices <= 0)
return nullptr;
unsigned primaryNodesCount = 0;
GRefPtr<WPEDRMDevice> drmDevice;
for (int i = 0; i < numDevices; ++i) {
drmDevicePtr device = devices[i];
bool hasPrimaryNode = device->available_nodes & (1 << DRM_NODE_PRIMARY);
if (!hasPrimaryNode)
continue;
bool hasRenderNode = device->available_nodes & (1 << DRM_NODE_RENDER);
const char* primaryNode = device->nodes[DRM_NODE_PRIMARY];
const char* renderNode = hasRenderNode ? device->nodes[DRM_NODE_RENDER] : nullptr;
if (deviceFilename) {
if (!g_strcmp0(deviceFilename, primaryNode) || !g_strcmp0(deviceFilename, renderNode)) {
drmDevice = adoptGRef(wpe_drm_device_new(primaryNode, renderNode));
break;
}
continue;
}
primaryNodesCount++;
if (drmDevice) {
if (wpe_drm_device_get_render_node(drmDevice.get()))
break;
if (!hasRenderNode)
continue;
}
drmDevice = adoptGRef(wpe_drm_device_new(primaryNode, renderNode));
}
drmFreeDevices(devices.data(), numDevices);
if (!deviceFilename && drmDevice && primaryNodesCount > 1)
g_warning("Infered DRM device (%s) using libdrm but multiple were found, you can override this with WPE_DRM_DEVICE", wpe_drm_device_get_primary_node(drmDevice.get()));
return drmDevice;
#else
return nullptr;
#endif
}
/**
* wpe_drm_device_new:
* @primary_node: the filename of the primary node
* @render_node: (nullable): the filename of the render node, or %NULL
*
* Create a new #WPEDRMDevice for the given @primary_node and @render_node.
*
* Returns: (transfer full): a new #WPEDRMDevice
*/
WPEDRMDevice* wpe_drm_device_new(const char* primaryNode, const char *renderNode)
{
g_return_val_if_fail(primaryNode, nullptr);
auto* device = static_cast<WPEDRMDevice*>(fastMalloc(sizeof(WPEDRMDevice)));
new (device) WPEDRMDevice(primaryNode, renderNode);
return device;
}
/**
* wpe_drm_device_ref:
* @device: a #WPEDRMDevice
*
* Atomically acquires a reference on the given @device.
*
* This function is MT-safe and may be called from any thread.
*
* Returns: (transfer full): The same @device with an additional reference.
*/
WPEDRMDevice* wpe_drm_device_ref(WPEDRMDevice* device)
{
g_return_val_if_fail(device, nullptr);
g_atomic_int_inc(&device->referenceCount);
return device;
}
/**
* wpe_drm_device_unref:
* @device: a #WPEDRMDevice
*
* Atomically releases a reference on the given @device.
*
* If the reference was the last, the resources associated to the
* @device are freed. This function is MT-safe and may be called from
* any thread.
*/
void wpe_drm_device_unref(WPEDRMDevice* device)
{
g_return_if_fail(device);
if (g_atomic_int_dec_and_test(&device->referenceCount)) {
device->~WPEDRMDevice();
fastFree(device);
}
}
/**
* wpe_drm_device_get_primary_node:
* @device: a #WPEDRMDevice
*
* Get the filename of primary node of @device.
*
* Returns: (transfer none): the filename of primary node.
*/
const char* wpe_drm_device_get_primary_node(WPEDRMDevice* device)
{
g_return_val_if_fail(device, nullptr);
return device->primaryNode.data();
}
/**
* wpe_drm_device_get_render_node:
* @device: a #WPEDRMDevice
*
* Get the filename of render node of @device.
*
* Returns: (transfer none) (nullable): the filename of render node or %NULL
*/
const char* wpe_drm_device_get_render_node(WPEDRMDevice* device)
{
g_return_val_if_fail(device, nullptr);
return device->renderNode.data();
}
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