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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <drm_fourcc.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <wlr/interfaces/wlr_input_device.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/render/wlr_renderer.h>
#include <wlr/util/log.h>
#include <xf86drm.h>
#include "backend/headless.h"
#include "render/drm_format_set.h"
#include "util/signal.h"
struct wlr_headless_backend *headless_backend_from_backend(
struct wlr_backend *wlr_backend) {
assert(wlr_backend_is_headless(wlr_backend));
return (struct wlr_headless_backend *)wlr_backend;
}
static bool backend_start(struct wlr_backend *wlr_backend) {
struct wlr_headless_backend *backend =
headless_backend_from_backend(wlr_backend);
wlr_log(WLR_INFO, "Starting headless backend");
struct wlr_headless_output *output;
wl_list_for_each(output, &backend->outputs, link) {
wl_event_source_timer_update(output->frame_timer, output->frame_delay);
wlr_output_update_enabled(&output->wlr_output, true);
wlr_signal_emit_safe(&backend->backend.events.new_output,
&output->wlr_output);
}
struct wlr_headless_input_device *input_device;
wl_list_for_each(input_device, &backend->input_devices, link) {
wlr_signal_emit_safe(&backend->backend.events.new_input,
&input_device->wlr_input_device);
}
backend->started = true;
return true;
}
static void backend_destroy(struct wlr_backend *wlr_backend) {
struct wlr_headless_backend *backend =
headless_backend_from_backend(wlr_backend);
if (!wlr_backend) {
return;
}
wl_list_remove(&backend->display_destroy.link);
struct wlr_headless_output *output, *output_tmp;
wl_list_for_each_safe(output, output_tmp, &backend->outputs, link) {
wlr_output_destroy(&output->wlr_output);
}
struct wlr_headless_input_device *input_device, *input_device_tmp;
wl_list_for_each_safe(input_device, input_device_tmp,
&backend->input_devices, link) {
wlr_input_device_destroy(&input_device->wlr_input_device);
}
wlr_backend_finish(wlr_backend);
close(backend->drm_fd);
free(backend);
}
static int backend_get_drm_fd(struct wlr_backend *wlr_backend) {
struct wlr_headless_backend *backend =
headless_backend_from_backend(wlr_backend);
return backend->drm_fd;
}
static uint32_t get_buffer_caps(struct wlr_backend *wlr_backend) {
return WLR_BUFFER_CAP_DATA_PTR
| WLR_BUFFER_CAP_DMABUF
| WLR_BUFFER_CAP_SHM;
}
static const struct wlr_backend_impl backend_impl = {
.start = backend_start,
.destroy = backend_destroy,
.get_drm_fd = backend_get_drm_fd,
.get_buffer_caps = get_buffer_caps,
};
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_headless_backend *backend =
wl_container_of(listener, backend, display_destroy);
backend_destroy(&backend->backend);
}
static bool backend_init(struct wlr_headless_backend *backend,
struct wl_display *display) {
wlr_backend_init(&backend->backend, &backend_impl);
backend->display = display;
wl_list_init(&backend->outputs);
wl_list_init(&backend->input_devices);
backend->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &backend->display_destroy);
return true;
}
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(drmDevice *));
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;
}
struct wlr_backend *wlr_headless_backend_create(struct wl_display *display) {
wlr_log(WLR_INFO, "Creating headless backend");
struct wlr_headless_backend *backend =
calloc(1, sizeof(struct wlr_headless_backend));
if (!backend) {
wlr_log(WLR_ERROR, "Failed to allocate wlr_headless_backend");
return NULL;
}
backend->drm_fd = open_drm_render_node();
if (backend->drm_fd < 0) {
wlr_log(WLR_ERROR, "Failed to open DRM render node");
}
if (!backend_init(backend, display)) {
goto error_init;
}
return &backend->backend;
error_init:
close(backend->drm_fd);
free(backend);
return NULL;
}
struct wlr_backend *wlr_headless_backend_create_with_renderer(
struct wl_display *display, struct wlr_renderer *renderer) {
wlr_log(WLR_INFO, "Creating headless backend with parent renderer");
struct wlr_headless_backend *backend =
calloc(1, sizeof(struct wlr_headless_backend));
if (!backend) {
wlr_log(WLR_ERROR, "Failed to allocate wlr_headless_backend");
return NULL;
}
int drm_fd = wlr_renderer_get_drm_fd(renderer);
if (drm_fd < 0) {
wlr_log(WLR_ERROR, "Failed to get DRM device FD from parent renderer");
backend->drm_fd = -1;
} else {
backend->drm_fd = fcntl(drm_fd, F_DUPFD_CLOEXEC, 0);
if (backend->drm_fd < 0) {
wlr_log_errno(WLR_ERROR, "fcntl(F_DUPFD_CLOEXEC) failed");
}
}
if (!backend_init(backend, display)) {
goto error_init;
}
return &backend->backend;
error_init:
close(backend->drm_fd);
free(backend);
return NULL;
}
bool wlr_backend_is_headless(struct wlr_backend *backend) {
return backend->impl == &backend_impl;
}
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