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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include <wayland-server.h>
#include <xf86drm.h>
#include <sys/stat.h>
#include <wlr/backend/session.h>
#include <wlr/backend/interface.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/util/list.h>
#include <wlr/util/log.h>
#include <wlr/egl.h>
#include "backend/udev.h"
#include "backend/drm.h"
static bool wlr_drm_backend_init(struct wlr_backend *_backend) {
struct wlr_drm_backend *backend = (struct wlr_drm_backend *)_backend;
wlr_drm_scan_connectors(backend);
return true;
}
static void wlr_drm_backend_destroy(struct wlr_backend *_backend) {
if (!_backend) {
return;
}
struct wlr_drm_backend *backend = (struct wlr_drm_backend *)_backend;
for (size_t i = 0; backend->outputs && i < backend->outputs->length; ++i) {
struct wlr_output_state *output = backend->outputs->items[i];
wlr_output_destroy(output->base);
}
wlr_udev_signal_remove(backend->udev, &backend->drm_invalidated);
wlr_drm_renderer_free(&backend->renderer);
wlr_drm_resources_free(backend);
wlr_session_close_file(backend->session, backend->fd);
wl_event_source_remove(backend->drm_event);
list_free(backend->outputs);
free(backend);
}
static struct wlr_egl *wlr_drm_backend_get_egl(struct wlr_backend *_backend) {
struct wlr_drm_backend *backend = (struct wlr_drm_backend *)_backend;
return &backend->renderer.egl;
}
static struct wlr_backend_impl backend_impl = {
.init = wlr_drm_backend_init,
.destroy = wlr_drm_backend_destroy,
.get_egl = wlr_drm_backend_get_egl
};
static void session_signal(struct wl_listener *listener, void *data) {
struct wlr_drm_backend *backend =
wl_container_of(listener, backend, session_signal);
struct wlr_session *session = data;
if (session->active) {
wlr_log(L_INFO, "DRM fd resumed");
for (size_t i = 0; i < backend->outputs->length; ++i) {
struct wlr_output_state *output = backend->outputs->items[i];
wlr_drm_output_start_renderer(output);
if (!output->crtc) {
continue;
}
struct wlr_drm_plane *plane = output->crtc->cursor;
backend->iface->crtc_set_cursor(backend, output->crtc,
plane ? plane->cursor_bo : NULL);
}
} else {
wlr_log(L_INFO, "DRM fd paused");
}
}
static void drm_invalidated(struct wl_listener *listener, void *data) {
struct wlr_drm_backend *backend =
wl_container_of(listener, backend, drm_invalidated);
struct wlr_udev *udev = data;
(void)udev;
char *name = drmGetDeviceNameFromFd2(backend->fd);
wlr_log(L_DEBUG, "%s invalidated", name);
free(name);
wlr_drm_scan_connectors(backend);
}
struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
struct wlr_session *session, struct wlr_udev *udev, int gpu_fd) {
assert(display && session && gpu_fd >= 0);
char *name = drmGetDeviceNameFromFd2(gpu_fd);
drmVersion *version = drmGetVersion(gpu_fd);
wlr_log(L_INFO, "Initalizing DRM backend for %s (%s)", name, version->name);
free(name);
drmFreeVersion(version);
struct wlr_drm_backend *backend = calloc(1, sizeof(struct wlr_drm_backend));
if (!backend) {
wlr_log_errno(L_ERROR, "Allocation failed");
return NULL;
}
wlr_backend_create(&backend->backend, &backend_impl);
backend->session = session;
backend->udev = udev;
backend->outputs = list_create();
if (!backend->outputs) {
wlr_log(L_ERROR, "Failed to allocate list");
goto error_backend;
}
backend->fd = gpu_fd;
struct stat st;
if (fstat(backend->fd, &st) < 0) {
wlr_log_errno(L_ERROR, "Stat failed");
}
backend->dev = st.st_rdev;
backend->drm_invalidated.notify = drm_invalidated;
wlr_udev_signal_add(udev, backend->dev, &backend->drm_invalidated);
backend->display = display;
struct wl_event_loop *event_loop = wl_display_get_event_loop(display);
backend->drm_event = wl_event_loop_add_fd(event_loop, backend->fd,
WL_EVENT_READABLE, wlr_drm_event, NULL);
if (!backend->drm_event) {
wlr_log(L_ERROR, "Failed to create DRM event source");
goto error_fd;
}
backend->session_signal.notify = session_signal;
wl_signal_add(&session->session_signal, &backend->session_signal);
if (!wlr_drm_check_features(backend)) {
goto error_event;
}
if (!wlr_drm_resources_init(backend)) {
goto error_event;
}
if (!wlr_drm_renderer_init(&backend->renderer, backend->fd)) {
wlr_log(L_ERROR, "Failed to initialize renderer");
goto error_event;
}
if (!wlr_egl_bind_display(&backend->renderer.egl, display)) {
wlr_log(L_INFO, "Failed to bind egl/wl display: %s", egl_error());
}
return &backend->backend;
error_event:
wl_event_source_remove(backend->drm_event);
error_fd:
wlr_session_close_file(backend->session, backend->fd);
list_free(backend->outputs);
error_backend:
free(backend);
return NULL;
}
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