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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/session.h>
#include <wlr/types.h>
#include <wlr/common/list.h>
#include <wlr/backend/interface.h>
#include "backend/udev.h"
#include "backend/drm/backend.h"
#include "backend/drm/drm.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;
}
for (size_t i = 0; state->outputs && i < state->outputs->length; ++i) {
struct wlr_output_state *output = state->outputs->items[i];
wlr_output_destroy(output->wlr_output);
}
wlr_udev_signal_remove(state->udev, &state->drm_invalidated);
wlr_drm_renderer_free(&state->renderer);
wlr_session_close_file(state->session, state->fd);
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 *drm = wl_container_of(listener, drm, device_paused);
struct device_arg *arg = data;
// TODO: Actually pause the renderer or something.
// We currently just expect it to fail its next pageflip.
if (arg->dev == drm->dev) {
wlr_log(L_INFO, "DRM fd paused");
}
}
static void device_resumed(struct wl_listener *listener, void *data) {
struct wlr_backend_state *drm = wl_container_of(listener, drm, device_resumed);
struct device_arg *arg = data;
if (arg->dev != drm->dev) {
return;
}
if (dup2(arg->fd, drm->fd) < 0) {
wlr_log(L_ERROR, "dup2 failed: %s", strerror(errno));
return;
}
wlr_log(L_INFO, "DRM fd resumed");
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);
}
}
static void drm_invalidated(struct wl_listener *listener, void *data) {
struct wlr_backend_state *drm = wl_container_of(listener, drm, drm_invalidated);
struct wlr_udev *udev = data;
(void)udev;
char *name = drmGetDeviceNameFromFd2(drm->fd);
wlr_log(L_DEBUG, "%s invalidated", name);
free(name);
wlr_drm_scan_connectors(drm);
}
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_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->udev = udev;
state->outputs = list_create();
if (!state->outputs) {
wlr_log(L_ERROR, "Failed to allocate list");
goto error_backend;
}
state->fd = gpu_fd;
struct stat st;
if (fstat(state->fd, &st) < 0) {
wlr_log(L_ERROR, "Stat failed: %s", strerror(errno));
}
state->dev = st.st_rdev;
state->drm_invalidated.notify = drm_invalidated;
wlr_udev_signal_add(udev, state->dev, &state->drm_invalidated);
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);
list_free(state->outputs);
error_backend:
free(state);
free(backend);
return NULL;
}
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