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Scan DRM device nodes for the VK_KHR_display backend

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To specify a DRM device node for the VK_KHR_display backend,
WSI_DISPLAY_DRI_DEV environment variable needs to be set. If
WSI_DISPLAY_DRI_DEV is not set, the VK_KHR_display backend
now scans all DRM device node, and uses the first node
that has a display connected.

Signed-off-by: Fufu Fang <fufu.fang@arm.com>
Change-Id: Idbcda60cf3b1656784e6d3b0547cc70e99f0fc52
This commit is contained in:
Fufu Fang 2025-09-11 10:50:01 +00:00 • committed by Rosen Zhelev
parent edcd2c2629
commit 5e53d9637f
1 changed files with 36 additions and 6 deletions
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42
wsi/display/drm_display.cpp
View file

@ -34,14 +34,14 @@
#include <unistd.h>
#include <assert.h>
#include <drm_fourcc.h>
#include <dirent.h>
namespace wsi
{
namespace display
{
const std::string default_dri_device_name{ "/dev/dri/card0" };
drm_display::drm_display(util::fd_owner drm_fd, int crtc_id, drm_connector_owner drm_connector,
util::unique_ptr<util::vector<util::drm::drm_format_pair>> supported_formats,
util::unique_ptr<drm_display_mode> display_modes, size_t num_display_modes, uint32_t max_width,
@ -355,12 +355,42 @@ std::optional<drm_display> &drm_display::get_display()
std::call_once(flag, []() {
const char *dri_device = std::getenv("WSI_DISPLAY_DRI_DEV");
if (!dri_device)
if (dri_device)
{
dri_device = default_dri_device_name.c_str();
display = drm_display::make_display(util::allocator::get_generic(), dri_device);
if (!display.has_value())
{
WSI_LOG_ERROR("Failed to open DRM device: %s", dri_device);
}
else
{
WSI_LOG_INFO("Using DRM device from WSI_DISPLAY_DRI_DEV: %s", dri_device);
}
}
else
{
const char *dri_dir = "/dev/dri";
DIR *dir = opendir(dri_dir);
if (!dir)
{
return;
}
struct dirent *entry;
while ((entry = readdir(dir)) != nullptr)
{
if (strncmp(entry->d_name, "card", 4) == 0)
{
std::string path = std::string(dri_dir) + "/" + entry->d_name;
display = drm_display::make_display(util::allocator::get_generic(), path.c_str());
if (display.has_value())
{
WSI_LOG_INFO("Using DRM device: %s", path.c_str());
break;
}
}
}
closedir(dir);
}
display = drm_display::make_display(util::allocator::get_generic(), dri_device);
});
return display;
}