mirror of
https://github.com/hyprwm/wlroots-hyprland.git
synced 2024-11-02 03:45:58 +01:00
1c4a625fe3
The following situation can be dangerous: - Output DP-1 is plugged in, compositor enables it. - User VT switches away. - User unplugs DP-1. - User VT switches back. - scan_drm_connectors() figures out the output is now disconnected, uninitializes the struct wlr_output. - The loop restoring previous output state in handle_session_active() accesses the struct wlr_output to figure out what to restore. By chance, we zero out the struct wlr_output after uninitializing it, so enabled and current_mode will always be zero. But let's make sure we handle this case explicitly, to remind future readers that it exists and make the code less fragile.
292 lines
8.3 KiB
C
292 lines
8.3 KiB
C
#include <assert.h>
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#include <errno.h>
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#include <drm_fourcc.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <wayland-server-core.h>
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#include <wlr/backend/interface.h>
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#include <wlr/backend/session.h>
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#include <wlr/interfaces/wlr_output.h>
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#include <wlr/util/log.h>
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#include <xf86drm.h>
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#include "backend/drm/drm.h"
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struct wlr_drm_backend *get_drm_backend_from_backend(
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struct wlr_backend *wlr_backend) {
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assert(wlr_backend_is_drm(wlr_backend));
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return (struct wlr_drm_backend *)wlr_backend;
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}
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static bool backend_start(struct wlr_backend *backend) {
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struct wlr_drm_backend *drm = get_drm_backend_from_backend(backend);
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scan_drm_connectors(drm, NULL);
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return true;
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}
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static void backend_destroy(struct wlr_backend *backend) {
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if (!backend) {
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return;
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}
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struct wlr_drm_backend *drm = get_drm_backend_from_backend(backend);
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struct wlr_drm_connector *conn, *next;
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wl_list_for_each_safe(conn, next, &drm->outputs, link) {
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destroy_drm_connector(conn);
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}
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wlr_backend_finish(backend);
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struct wlr_drm_fb *fb, *fb_tmp;
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wl_list_for_each_safe(fb, fb_tmp, &drm->fbs, link) {
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drm_fb_destroy(fb);
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}
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wl_list_remove(&drm->display_destroy.link);
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wl_list_remove(&drm->session_destroy.link);
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wl_list_remove(&drm->session_active.link);
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wl_list_remove(&drm->parent_destroy.link);
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wl_list_remove(&drm->dev_change.link);
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wl_list_remove(&drm->dev_remove.link);
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if (drm->parent) {
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finish_drm_renderer(&drm->mgpu_renderer);
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}
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finish_drm_resources(drm);
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free(drm->name);
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wlr_session_close_file(drm->session, drm->dev);
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wl_event_source_remove(drm->drm_event);
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free(drm);
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}
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static clockid_t backend_get_presentation_clock(struct wlr_backend *backend) {
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struct wlr_drm_backend *drm = get_drm_backend_from_backend(backend);
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return drm->clock;
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}
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static int backend_get_drm_fd(struct wlr_backend *backend) {
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struct wlr_drm_backend *drm = get_drm_backend_from_backend(backend);
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if (drm->parent) {
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return drm->parent->fd;
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} else {
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return drm->fd;
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}
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}
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static uint32_t drm_backend_get_buffer_caps(struct wlr_backend *backend) {
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return WLR_BUFFER_CAP_DMABUF;
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}
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static const struct wlr_backend_impl backend_impl = {
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.start = backend_start,
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.destroy = backend_destroy,
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.get_presentation_clock = backend_get_presentation_clock,
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.get_drm_fd = backend_get_drm_fd,
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.get_buffer_caps = drm_backend_get_buffer_caps,
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};
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bool wlr_backend_is_drm(struct wlr_backend *b) {
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return b->impl == &backend_impl;
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}
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static void handle_session_active(struct wl_listener *listener, void *data) {
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struct wlr_drm_backend *drm =
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wl_container_of(listener, drm, session_active);
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struct wlr_session *session = drm->session;
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if (session->active) {
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wlr_log(WLR_INFO, "DRM fd resumed");
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scan_drm_connectors(drm, NULL);
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struct wlr_drm_connector *conn;
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wl_list_for_each(conn, &drm->outputs, link) {
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struct wlr_output_mode *mode = NULL;
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uint32_t committed = WLR_OUTPUT_STATE_ENABLED;
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if (conn->status != DRM_MODE_DISCONNECTED && conn->output.enabled
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&& conn->output.current_mode != NULL) {
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committed |= WLR_OUTPUT_STATE_MODE;
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mode = conn->output.current_mode;
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}
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struct wlr_output_state state = {
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.committed = committed,
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.allow_artifacts = true,
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.enabled = mode != NULL,
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.mode_type = WLR_OUTPUT_STATE_MODE_FIXED,
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.mode = mode,
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};
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if (!drm_connector_commit_state(conn, &state)) {
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wlr_drm_conn_log(conn, WLR_ERROR, "Failed to restore state after VT switch");
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}
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}
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} else {
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wlr_log(WLR_INFO, "DRM fd paused");
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}
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}
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static void handle_dev_change(struct wl_listener *listener, void *data) {
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struct wlr_drm_backend *drm = wl_container_of(listener, drm, dev_change);
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struct wlr_device_change_event *change = data;
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if (!drm->session->active) {
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return;
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}
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switch (change->type) {
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case WLR_DEVICE_HOTPLUG:
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wlr_log(WLR_DEBUG, "Received hotplug event for %s", drm->name);
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scan_drm_connectors(drm, &change->hotplug);
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break;
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case WLR_DEVICE_LEASE:
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wlr_log(WLR_DEBUG, "Received lease event for %s", drm->name);
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scan_drm_leases(drm);
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break;
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default:
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wlr_log(WLR_DEBUG, "Received unknown change event for %s", drm->name);
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}
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}
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static void handle_dev_remove(struct wl_listener *listener, void *data) {
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struct wlr_drm_backend *drm = wl_container_of(listener, drm, dev_remove);
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wlr_log(WLR_INFO, "Destroying DRM backend for %s", drm->name);
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backend_destroy(&drm->backend);
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}
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static void handle_session_destroy(struct wl_listener *listener, void *data) {
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struct wlr_drm_backend *drm =
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wl_container_of(listener, drm, session_destroy);
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backend_destroy(&drm->backend);
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}
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static void handle_display_destroy(struct wl_listener *listener, void *data) {
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struct wlr_drm_backend *drm =
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wl_container_of(listener, drm, display_destroy);
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backend_destroy(&drm->backend);
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}
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static void handle_parent_destroy(struct wl_listener *listener, void *data) {
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struct wlr_drm_backend *drm =
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wl_container_of(listener, drm, parent_destroy);
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backend_destroy(&drm->backend);
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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_device *dev,
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struct wlr_backend *parent) {
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assert(display && session && dev);
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assert(!parent || wlr_backend_is_drm(parent));
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char *name = drmGetDeviceNameFromFd2(dev->fd);
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drmVersion *version = drmGetVersion(dev->fd);
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wlr_log(WLR_INFO, "Initializing DRM backend for %s (%s)", name, version->name);
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drmFreeVersion(version);
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struct wlr_drm_backend *drm = calloc(1, sizeof(struct wlr_drm_backend));
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if (!drm) {
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wlr_log_errno(WLR_ERROR, "Allocation failed");
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return NULL;
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}
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wlr_backend_init(&drm->backend, &backend_impl);
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drm->session = session;
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wl_list_init(&drm->fbs);
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wl_list_init(&drm->outputs);
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drm->dev = dev;
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drm->fd = dev->fd;
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drm->name = name;
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if (parent != NULL) {
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drm->parent = get_drm_backend_from_backend(parent);
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drm->parent_destroy.notify = handle_parent_destroy;
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wl_signal_add(&parent->events.destroy, &drm->parent_destroy);
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} else {
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wl_list_init(&drm->parent_destroy.link);
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}
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drm->dev_change.notify = handle_dev_change;
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wl_signal_add(&dev->events.change, &drm->dev_change);
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drm->dev_remove.notify = handle_dev_remove;
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wl_signal_add(&dev->events.remove, &drm->dev_remove);
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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, handle_drm_event, drm);
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if (!drm->drm_event) {
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wlr_log(WLR_ERROR, "Failed to create DRM event source");
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goto error_fd;
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}
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drm->session_active.notify = handle_session_active;
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wl_signal_add(&session->events.active, &drm->session_active);
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if (!check_drm_features(drm)) {
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goto error_event;
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}
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if (!init_drm_resources(drm)) {
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goto error_event;
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}
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if (drm->parent) {
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if (!init_drm_renderer(drm, &drm->mgpu_renderer)) {
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wlr_log(WLR_ERROR, "Failed to initialize renderer");
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goto error_resources;
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}
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// We'll perform a multi-GPU copy for all submitted buffers, we need
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// to be able to texture from them
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struct wlr_renderer *renderer = drm->mgpu_renderer.wlr_rend;
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const struct wlr_drm_format_set *texture_formats =
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wlr_renderer_get_dmabuf_texture_formats(renderer);
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if (texture_formats == NULL) {
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wlr_log(WLR_ERROR, "Failed to query renderer texture formats");
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goto error_mgpu_renderer;
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}
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// Forbid implicit modifiers, because their meaning changes from one
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// GPU to another.
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for (size_t i = 0; i < texture_formats->len; i++) {
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const struct wlr_drm_format *fmt = texture_formats->formats[i];
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for (size_t j = 0; j < fmt->len; j++) {
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uint64_t mod = fmt->modifiers[j];
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if (mod == DRM_FORMAT_MOD_INVALID) {
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continue;
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}
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wlr_drm_format_set_add(&drm->mgpu_formats, fmt->format, mod);
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}
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}
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}
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drm->session_destroy.notify = handle_session_destroy;
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wl_signal_add(&session->events.destroy, &drm->session_destroy);
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drm->display_destroy.notify = handle_display_destroy;
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wl_display_add_destroy_listener(display, &drm->display_destroy);
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return &drm->backend;
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error_mgpu_renderer:
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finish_drm_renderer(&drm->mgpu_renderer);
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error_resources:
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finish_drm_resources(drm);
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error_event:
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wl_list_remove(&drm->session_active.link);
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wl_event_source_remove(drm->drm_event);
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error_fd:
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wl_list_remove(&drm->dev_remove.link);
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wl_list_remove(&drm->dev_change.link);
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wl_list_remove(&drm->parent_destroy.link);
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wlr_session_close_file(drm->session, dev);
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free(drm);
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return NULL;
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}
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