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#define _POSIX_C_SOURCE 200809L
#include <fcntl.h>
#include <unistd.h>
#include <wlr/util/log.h>
#include <wlr/types/wlr_buffer.h>
#include <xf86drm.h>
#include "render/fx_renderer/util.h"
static uint32_t backend_get_buffer_caps(struct wlr_backend *backend) {
if (!backend->impl->get_buffer_caps) {
return 0;
}
return backend->impl->get_buffer_caps(backend);
}
static int open_drm_render_node(void) {
uint32_t flags = 0;
int devices_len = drmGetDevices2(flags, NULL, 0);
if (devices_len < 0) {
wlr_log(WLR_ERROR, "drmGetDevices2 failed: %s", strerror(-devices_len));
return -1;
}
drmDevice **devices = calloc(devices_len, sizeof(*devices));
if (devices == NULL) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return -1;
}
devices_len = drmGetDevices2(flags, devices, devices_len);
if (devices_len < 0) {
free(devices);
wlr_log(WLR_ERROR, "drmGetDevices2 failed: %s", strerror(-devices_len));
return -1;
}
int fd = -1;
for (int i = 0; i < devices_len; i++) {
drmDevice *dev = devices[i];
if (dev->available_nodes & (1 << DRM_NODE_RENDER)) {
const char *name = dev->nodes[DRM_NODE_RENDER];
wlr_log(WLR_DEBUG, "Opening DRM render node '%s'", name);
fd = open(name, O_RDWR | O_CLOEXEC);
if (fd < 0) {
wlr_log_errno(WLR_ERROR, "Failed to open '%s'", name);
goto out;
}
break;
}
}
if (fd < 0) {
wlr_log(WLR_ERROR, "Failed to find any DRM render node");
}
out:
for (int i = 0; i < devices_len; i++) {
drmFreeDevice(&devices[i]);
}
free(devices);
return fd;
}
bool open_preferred_drm_fd(struct wlr_backend *backend, int *drm_fd_ptr,
bool *own_drm_fd) {
if (*drm_fd_ptr >= 0) {
return true;
}
// Allow the user to override the render node
const char *render_name = getenv("WLR_RENDER_DRM_DEVICE");
if (render_name != NULL) {
wlr_log(WLR_INFO,
"Opening DRM render node '%s' from WLR_RENDER_DRM_DEVICE",
render_name);
int drm_fd = open(render_name, O_RDWR | O_CLOEXEC);
if (drm_fd < 0) {
wlr_log_errno(WLR_ERROR, "Failed to open '%s'", render_name);
return false;
}
if (drmGetNodeTypeFromFd(drm_fd) != DRM_NODE_RENDER) {
wlr_log(WLR_ERROR, "'%s' is not a DRM render node", render_name);
close(drm_fd);
return false;
}
*drm_fd_ptr = drm_fd;
*own_drm_fd = true;
return true;
}
// Prefer the backend's DRM node, if any
int backend_drm_fd = wlr_backend_get_drm_fd(backend);
if (backend_drm_fd >= 0) {
*drm_fd_ptr = backend_drm_fd;
*own_drm_fd = false;
return true;
}
// If the backend hasn't picked a DRM FD, but accepts DMA-BUFs, pick an
// arbitrary render node
uint32_t backend_caps = backend_get_buffer_caps(backend);
if (backend_caps & WLR_BUFFER_CAP_DMABUF) {
int drm_fd = open_drm_render_node();
if (drm_fd < 0) {
return false;
}
*drm_fd_ptr = drm_fd;
*own_drm_fd = true;
return true;
}
return false;
}
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