wlroots/backend/drm/backend.c

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