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304 lines
8.8 KiB
304 lines
8.8 KiB
#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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struct wlr_drm_backend *backend = wl_container_of(wlr_backend, backend, backend);
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return 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->connectors, link) {
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conn->crtc = NULL; // leave CRTCs on when shutting down
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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 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_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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// The previous DRM master leaves KMS in an undefined state. We need
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// to restore out own state, but be careful to avoid invalid
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// configurations. The connector/CRTC mapping may have changed, so
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// first disable all CRTCs, then light up the ones we were using
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// before the VT switch.
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// TODO: use the atomic API to improve restoration after a VT switch
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for (size_t i = 0; i < drm->num_crtcs; i++) {
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struct wlr_drm_crtc *crtc = &drm->crtcs[i];
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if (drmModeSetCrtc(drm->fd, crtc->id, 0, 0, 0, NULL, 0, NULL) != 0) {
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wlr_log_errno(WLR_ERROR, "Failed to disable CRTC %"PRIu32" after VT switch",
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crtc->id);
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}
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}
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struct wlr_drm_connector *conn;
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wl_list_for_each(conn, &drm->connectors, link) {
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bool enabled = conn->status != DRM_MODE_DISCONNECTED && conn->output.enabled;
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struct wlr_output_state state;
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wlr_output_state_init(&state);
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wlr_output_state_set_enabled(&state, enabled);
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if (enabled) {
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if (conn->output.current_mode != NULL) {
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wlr_output_state_set_mode(&state, conn->output.current_mode);
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} else {
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wlr_output_state_set_custom_mode(&state,
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conn->output.width, conn->output.height, conn->output.refresh);
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}
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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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wlr_output_state_finish(&state);
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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(*drm));
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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->connectors);
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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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