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#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <wayland-server.h>
#include <wlr/session.h>
#include <wlr/common/list.h>
#include "backend.h"
#include "backend/drm/backend.h"
#include "backend/drm/drm.h"
#include "backend/drm/udev.h"
#include "common/log.h"
static bool wlr_drm_backend_init(struct wlr_backend_state *state) {
wlr_drm_scan_connectors(state);
return true;
}
static void wlr_drm_backend_destroy(struct wlr_backend_state *state) {
if (!state) {
return;
}
// TODO: free outputs in shared backend code
wlr_drm_renderer_free(&state->renderer);
wlr_udev_free(&state->udev);
wlr_session_close_file(state->session, state->fd);
wlr_session_finish(state->session);
wl_event_source_remove(state->drm_event);
free(state);
}
static struct wlr_backend_impl backend_impl = {
.init = wlr_drm_backend_init,
.destroy = wlr_drm_backend_destroy
};
static void device_paused(struct wl_listener *listener, void *data) {
struct wlr_backend_state *backend = wl_container_of(listener, backend, device_paused);
// TODO: Actually pause the renderer or something.
// We currently just expect it to fail its next pageflip.
(void)backend;
}
static void device_resumed(struct wl_listener *listener, void *data) {
struct wlr_backend_state *drm = wl_container_of(listener, drm, device_resumed);
int *new_fd = data;
if (dup2(*new_fd, drm->fd) < 0) {
wlr_log(L_ERROR, "dup2 failed: %s", strerror(errno));
return;
}
for (size_t i = 0; i < drm->outputs->length; ++i) {
struct wlr_output_state *output = drm->outputs->items[i];
wlr_drm_output_start_renderer(output);
}
}
struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
struct wlr_session *session) {
struct wlr_backend_state *state = calloc(1, sizeof(struct wlr_backend_state));
if (!state) {
wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
return NULL;
}
struct wlr_backend *backend = wlr_backend_create(&backend_impl, state);
if (!backend) {
wlr_log(L_ERROR, "Allocation failed: %s", strerror(errno));
return NULL;
}
state->backend = backend;
state->session = session;
state->outputs = list_create();
if (!state->outputs) {
wlr_log(L_ERROR, "Failed to allocate list");
goto error_backend;
}
if (!wlr_udev_init(display, &state->udev)) {
wlr_log(L_ERROR, "Failed to start udev");
goto error_list;
}
state->fd = wlr_udev_find_gpu(&state->udev, state->session);
if (state->fd == -1) {
wlr_log(L_ERROR, "Failed to open DRM device");
goto error_udev;
}
struct wl_event_loop *event_loop = wl_display_get_event_loop(display);
state->drm_event = wl_event_loop_add_fd(event_loop, state->fd,
WL_EVENT_READABLE, wlr_drm_event, NULL);
if (!state->drm_event) {
wlr_log(L_ERROR, "Failed to create DRM event source");
goto error_fd;
}
wl_list_init(&state->device_paused.link);
wl_list_init(&state->device_paused.link);
state->device_paused.notify = device_paused;
state->device_resumed.notify = device_resumed;
wl_signal_add(&session->device_paused, &state->device_paused);
wl_signal_add(&session->device_resumed, &state->device_resumed);
// TODO: what is the difference between the per-output renderer and this
// one?
if (!wlr_drm_renderer_init(&state->renderer, state->fd)) {
wlr_log(L_ERROR, "Failed to initialize renderer");
goto error_event;
}
return backend;
error_event:
wl_event_source_remove(state->drm_event);
error_fd:
wlr_session_close_file(state->session, state->fd);
error_udev:
wlr_udev_free(&state->udev);
error_list:
list_free(state->outputs);
error_backend:
free(state);
free(backend);
return NULL;
}
void wlr_drm_backend_dpms(struct wlr_backend *backend, bool screen_on) {
struct wlr_backend_state *state = backend->state;
for (size_t i = 0; i < state->outputs->length; ++i) {
struct wlr_output_state *output = state->outputs->items[i];
wlr_drm_output_dpms(state->fd, output, screen_on);
}
}
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