wlroots-hyprland/backend/drm/backend.c
Simon Ser b0bd86285f backend/drm: leave CRTCs on when shutting down
This avoids a black screen during multiple seconds on shutdown.
To fully allow for flicker-free transitions between DRM masters,
we will also need [1].

[1]: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/4394

Closes: https://gitlab.freedesktop.org/wlroots/wlroots/-/issues/3497
2023-11-15 01:37:59 +00:00

303 lines
8.8 KiB
C

#include <assert.h>
#include <errno.h>
#include <drm_fourcc.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <wayland-server-core.h>
#include <wlr/backend/interface.h>
#include <wlr/backend/session.h>
#include <wlr/interfaces/wlr_output.h>
#include <wlr/util/log.h>
#include <xf86drm.h>
#include "backend/drm/drm.h"
struct wlr_drm_backend *get_drm_backend_from_backend(
struct wlr_backend *wlr_backend) {
assert(wlr_backend_is_drm(wlr_backend));
struct wlr_drm_backend *backend = wl_container_of(wlr_backend, backend, backend);
return backend;
}
static bool backend_start(struct wlr_backend *backend) {
struct wlr_drm_backend *drm = get_drm_backend_from_backend(backend);
scan_drm_connectors(drm, NULL);
return true;
}
static void backend_destroy(struct wlr_backend *backend) {
if (!backend) {
return;
}
struct wlr_drm_backend *drm = get_drm_backend_from_backend(backend);
struct wlr_drm_connector *conn, *next;
wl_list_for_each_safe(conn, next, &drm->connectors, link) {
conn->crtc = NULL; // leave CRTCs on when shutting down
destroy_drm_connector(conn);
}
wlr_backend_finish(backend);
struct wlr_drm_fb *fb, *fb_tmp;
wl_list_for_each_safe(fb, fb_tmp, &drm->fbs, link) {
drm_fb_destroy(fb);
}
wl_list_remove(&drm->display_destroy.link);
wl_list_remove(&drm->session_destroy.link);
wl_list_remove(&drm->session_active.link);
wl_list_remove(&drm->parent_destroy.link);
wl_list_remove(&drm->dev_change.link);
wl_list_remove(&drm->dev_remove.link);
if (drm->parent) {
finish_drm_renderer(&drm->mgpu_renderer);
}
finish_drm_resources(drm);
free(drm->name);
wlr_session_close_file(drm->session, drm->dev);
wl_event_source_remove(drm->drm_event);
free(drm);
}
static int backend_get_drm_fd(struct wlr_backend *backend) {
struct wlr_drm_backend *drm = get_drm_backend_from_backend(backend);
if (drm->parent) {
return drm->parent->fd;
} else {
return drm->fd;
}
}
static uint32_t drm_backend_get_buffer_caps(struct wlr_backend *backend) {
return WLR_BUFFER_CAP_DMABUF;
}
static const struct wlr_backend_impl backend_impl = {
.start = backend_start,
.destroy = backend_destroy,
.get_drm_fd = backend_get_drm_fd,
.get_buffer_caps = drm_backend_get_buffer_caps,
};
bool wlr_backend_is_drm(struct wlr_backend *b) {
return b->impl == &backend_impl;
}
static void handle_session_active(struct wl_listener *listener, void *data) {
struct wlr_drm_backend *drm =
wl_container_of(listener, drm, session_active);
struct wlr_session *session = drm->session;
if (session->active) {
wlr_log(WLR_INFO, "DRM fd resumed");
scan_drm_connectors(drm, NULL);
// The previous DRM master leaves KMS in an undefined state. We need
// to restore out own state, but be careful to avoid invalid
// configurations. The connector/CRTC mapping may have changed, so
// first disable all CRTCs, then light up the ones we were using
// before the VT switch.
// TODO: use the atomic API to improve restoration after a VT switch
for (size_t i = 0; i < drm->num_crtcs; i++) {
struct wlr_drm_crtc *crtc = &drm->crtcs[i];
if (drmModeSetCrtc(drm->fd, crtc->id, 0, 0, 0, NULL, 0, NULL) != 0) {
wlr_log_errno(WLR_ERROR, "Failed to disable CRTC %"PRIu32" after VT switch",
crtc->id);
}
}
struct wlr_drm_connector *conn;
wl_list_for_each(conn, &drm->connectors, link) {
bool enabled = conn->status != DRM_MODE_DISCONNECTED && conn->output.enabled;
struct wlr_output_state state;
wlr_output_state_init(&state);
wlr_output_state_set_enabled(&state, enabled);
if (enabled) {
if (conn->output.current_mode != NULL) {
wlr_output_state_set_mode(&state, conn->output.current_mode);
} else {
wlr_output_state_set_custom_mode(&state,
conn->output.width, conn->output.height, conn->output.refresh);
}
}
if (!drm_connector_commit_state(conn, &state)) {
wlr_drm_conn_log(conn, WLR_ERROR, "Failed to restore state after VT switch");
}
wlr_output_state_finish(&state);
}
} else {
wlr_log(WLR_INFO, "DRM fd paused");
}
}
static void handle_dev_change(struct wl_listener *listener, void *data) {
struct wlr_drm_backend *drm = wl_container_of(listener, drm, dev_change);
struct wlr_device_change_event *change = data;
if (!drm->session->active) {
return;
}
switch (change->type) {
case WLR_DEVICE_HOTPLUG:
wlr_log(WLR_DEBUG, "Received hotplug event for %s", drm->name);
scan_drm_connectors(drm, &change->hotplug);
break;
case WLR_DEVICE_LEASE:
wlr_log(WLR_DEBUG, "Received lease event for %s", drm->name);
scan_drm_leases(drm);
break;
default:
wlr_log(WLR_DEBUG, "Received unknown change event for %s", drm->name);
}
}
static void handle_dev_remove(struct wl_listener *listener, void *data) {
struct wlr_drm_backend *drm = wl_container_of(listener, drm, dev_remove);
wlr_log(WLR_INFO, "Destroying DRM backend for %s", drm->name);
backend_destroy(&drm->backend);
}
static void handle_session_destroy(struct wl_listener *listener, void *data) {
struct wlr_drm_backend *drm =
wl_container_of(listener, drm, session_destroy);
backend_destroy(&drm->backend);
}
static void handle_display_destroy(struct wl_listener *listener, void *data) {
struct wlr_drm_backend *drm =
wl_container_of(listener, drm, display_destroy);
backend_destroy(&drm->backend);
}
static void handle_parent_destroy(struct wl_listener *listener, void *data) {
struct wlr_drm_backend *drm =
wl_container_of(listener, drm, parent_destroy);
backend_destroy(&drm->backend);
}
struct wlr_backend *wlr_drm_backend_create(struct wl_display *display,
struct wlr_session *session, struct wlr_device *dev,
struct wlr_backend *parent) {
assert(display && session && dev);
assert(!parent || wlr_backend_is_drm(parent));
char *name = drmGetDeviceNameFromFd2(dev->fd);
drmVersion *version = drmGetVersion(dev->fd);
wlr_log(WLR_INFO, "Initializing DRM backend for %s (%s)", name, version->name);
drmFreeVersion(version);
struct wlr_drm_backend *drm = calloc(1, sizeof(*drm));
if (!drm) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return NULL;
}
wlr_backend_init(&drm->backend, &backend_impl);
drm->session = session;
wl_list_init(&drm->fbs);
wl_list_init(&drm->connectors);
drm->dev = dev;
drm->fd = dev->fd;
drm->name = name;
if (parent != NULL) {
drm->parent = get_drm_backend_from_backend(parent);
drm->parent_destroy.notify = handle_parent_destroy;
wl_signal_add(&parent->events.destroy, &drm->parent_destroy);
} else {
wl_list_init(&drm->parent_destroy.link);
}
drm->dev_change.notify = handle_dev_change;
wl_signal_add(&dev->events.change, &drm->dev_change);
drm->dev_remove.notify = handle_dev_remove;
wl_signal_add(&dev->events.remove, &drm->dev_remove);
drm->display = display;
struct wl_event_loop *event_loop = wl_display_get_event_loop(display);
drm->drm_event = wl_event_loop_add_fd(event_loop, drm->fd,
WL_EVENT_READABLE, handle_drm_event, drm);
if (!drm->drm_event) {
wlr_log(WLR_ERROR, "Failed to create DRM event source");
goto error_fd;
}
drm->session_active.notify = handle_session_active;
wl_signal_add(&session->events.active, &drm->session_active);
if (!check_drm_features(drm)) {
goto error_event;
}
if (!init_drm_resources(drm)) {
goto error_event;
}
if (drm->parent) {
if (!init_drm_renderer(drm, &drm->mgpu_renderer)) {
wlr_log(WLR_ERROR, "Failed to initialize renderer");
goto error_resources;
}
// We'll perform a multi-GPU copy for all submitted buffers, we need
// to be able to texture from them
struct wlr_renderer *renderer = drm->mgpu_renderer.wlr_rend;
const struct wlr_drm_format_set *texture_formats =
wlr_renderer_get_dmabuf_texture_formats(renderer);
if (texture_formats == NULL) {
wlr_log(WLR_ERROR, "Failed to query renderer texture formats");
goto error_mgpu_renderer;
}
// Forbid implicit modifiers, because their meaning changes from one
// GPU to another.
for (size_t i = 0; i < texture_formats->len; i++) {
const struct wlr_drm_format *fmt = &texture_formats->formats[i];
for (size_t j = 0; j < fmt->len; j++) {
uint64_t mod = fmt->modifiers[j];
if (mod == DRM_FORMAT_MOD_INVALID) {
continue;
}
wlr_drm_format_set_add(&drm->mgpu_formats, fmt->format, mod);
}
}
}
drm->session_destroy.notify = handle_session_destroy;
wl_signal_add(&session->events.destroy, &drm->session_destroy);
drm->display_destroy.notify = handle_display_destroy;
wl_display_add_destroy_listener(display, &drm->display_destroy);
return &drm->backend;
error_mgpu_renderer:
finish_drm_renderer(&drm->mgpu_renderer);
error_resources:
finish_drm_resources(drm);
error_event:
wl_list_remove(&drm->session_active.link);
wl_event_source_remove(drm->drm_event);
error_fd:
wl_list_remove(&drm->dev_remove.link);
wl_list_remove(&drm->dev_change.link);
wl_list_remove(&drm->parent_destroy.link);
wlr_session_close_file(drm->session, dev);
free(drm);
return NULL;
}