wlroots-hyprland/backend/drm/libliftoff.c

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#include <fcntl.h>
#include <libliftoff.h>
#include <stdlib.h>
#include <sys/stat.h>
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#include <unistd.h>
#include <wlr/util/log.h>
#include "backend/drm/drm.h"
#include "backend/drm/fb.h"
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#include "backend/drm/iface.h"
static bool init(struct wlr_drm_backend *drm) {
// TODO: lower log level
liftoff_log_set_priority(LIFTOFF_DEBUG);
int drm_fd = fcntl(drm->fd, F_DUPFD_CLOEXEC, 0);
if (drm_fd < 0) {
wlr_log_errno(WLR_ERROR, "fcntl(F_DUPFD_CLOEXEC) failed");
return false;
}
drm->liftoff = liftoff_device_create(drm_fd);
if (!drm->liftoff) {
wlr_log(WLR_ERROR, "Failed to create liftoff device");
close(drm_fd);
return false;
}
for (size_t i = 0; i < drm->num_planes; i++) {
struct wlr_drm_plane *plane = &drm->planes[i];
if (plane->initial_crtc_id != 0) {
continue;
}
plane->liftoff = liftoff_plane_create(drm->liftoff, plane->id);
if (plane->liftoff == NULL) {
wlr_log(WLR_ERROR, "Failed to create liftoff plane");
return false;
}
}
for (size_t i = 0; i < drm->num_crtcs; i++) {
struct wlr_drm_crtc *crtc = &drm->crtcs[i];
crtc->liftoff = liftoff_output_create(drm->liftoff, crtc->id);
if (!crtc->liftoff) {
wlr_log(WLR_ERROR, "Failed to create liftoff output");
return false;
}
crtc->liftoff_composition_layer = liftoff_layer_create(crtc->liftoff);
if (!crtc->liftoff_composition_layer) {
wlr_log(WLR_ERROR, "Failed to create liftoff composition layer");
return false;
}
liftoff_output_set_composition_layer(crtc->liftoff,
crtc->liftoff_composition_layer);
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if (crtc->primary) {
crtc->primary->liftoff_layer = liftoff_layer_create(crtc->liftoff);
if (!crtc->primary->liftoff_layer) {
wlr_log(WLR_ERROR, "Failed to create liftoff layer for primary plane");
return false;
}
}
if (crtc->cursor) {
crtc->cursor->liftoff_layer = liftoff_layer_create(crtc->liftoff);
if (!crtc->cursor->liftoff_layer) {
wlr_log(WLR_ERROR, "Failed to create liftoff layer for cursor plane");
return false;
}
}
}
return true;
}
static bool register_planes_for_crtc(struct wlr_drm_backend *drm,
struct wlr_drm_crtc *crtc) {
// When performing the first modeset on a CRTC, we need to be a bit careful
// when it comes to planes: we don't want to allow libliftoff to make use
// of planes currently already in-use on another CRTC. We need to wait for
// a modeset to happen on the other CRTC before being able to use these.
for (size_t i = 0; i < drm->num_planes; i++) {
struct wlr_drm_plane *plane = &drm->planes[i];
if (plane->liftoff != NULL || plane->initial_crtc_id != crtc->id) {
continue;
}
plane->liftoff = liftoff_plane_create(drm->liftoff, plane->id);
if (plane->liftoff == NULL) {
wlr_log(WLR_ERROR, "Failed to create liftoff plane");
return false;
}
}
return true;
}
static void finish(struct wlr_drm_backend *drm) {
for (size_t i = 0; i < drm->num_crtcs; i++) {
struct wlr_drm_crtc *crtc = &drm->crtcs[i];
if (crtc->primary) {
liftoff_layer_destroy(crtc->primary->liftoff_layer);
}
if (crtc->cursor) {
liftoff_layer_destroy(crtc->cursor->liftoff_layer);
}
liftoff_layer_destroy(crtc->liftoff_composition_layer);
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liftoff_output_destroy(crtc->liftoff);
}
for (size_t i = 0; i < drm->num_planes; i++) {
struct wlr_drm_plane *plane = &drm->planes[i];
liftoff_plane_destroy(plane->liftoff);
}
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liftoff_device_destroy(drm->liftoff);
}
static bool add_prop(drmModeAtomicReq *req, uint32_t obj,
uint32_t prop, uint64_t val) {
if (drmModeAtomicAddProperty(req, obj, prop, val) < 0) {
wlr_log_errno(WLR_ERROR, "drmModeAtomicAddProperty failed");
return false;
}
return true;
}
static bool set_plane_props(struct wlr_drm_plane *plane,
struct liftoff_layer *layer, struct wlr_drm_fb *fb, int32_t x, int32_t y, uint64_t zpos) {
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if (fb == NULL) {
wlr_log(WLR_ERROR, "Failed to acquire FB for plane %"PRIu32, plane->id);
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return false;
}
uint32_t width = fb->wlr_buf->width;
uint32_t height = fb->wlr_buf->height;
// The SRC_* properties are in 16.16 fixed point
return liftoff_layer_set_property(layer, "zpos", zpos) == 0 &&
liftoff_layer_set_property(layer, "SRC_X", 0) == 0 &&
liftoff_layer_set_property(layer, "SRC_Y", 0) == 0 &&
liftoff_layer_set_property(layer, "SRC_W", (uint64_t)width << 16) == 0 &&
liftoff_layer_set_property(layer, "SRC_H", (uint64_t)height << 16) == 0 &&
liftoff_layer_set_property(layer, "CRTC_X", (uint64_t)x) == 0 &&
liftoff_layer_set_property(layer, "CRTC_Y", (uint64_t)y) == 0 &&
liftoff_layer_set_property(layer, "CRTC_W", width) == 0 &&
liftoff_layer_set_property(layer, "CRTC_H", height) == 0 &&
liftoff_layer_set_property(layer, "FB_ID", fb->id) == 0;
}
static bool disable_plane(struct wlr_drm_plane *plane) {
return liftoff_layer_set_property(plane->liftoff_layer, "FB_ID", 0) == 0;
}
static uint64_t to_fp16(double v) {
return (uint64_t)round(v * (1 << 16));
}
static bool set_layer_props(struct wlr_drm_backend *drm,
const struct wlr_output_layer_state *state, uint64_t zpos,
struct wl_array *fb_damage_clips_arr) {
struct wlr_drm_layer *layer = get_drm_layer(drm, state->layer);
uint32_t width = 0, height = 0;
if (state->buffer != NULL) {
width = state->buffer->width;
height = state->buffer->height;
}
struct wlr_drm_fb *fb = layer->pending_fb;
int ret = 0;
if (state->buffer == NULL) {
ret = liftoff_layer_set_property(layer->liftoff, "FB_ID", 0);
} else if (fb == NULL) {
liftoff_layer_set_fb_composited(layer->liftoff);
} else {
ret = liftoff_layer_set_property(layer->liftoff, "FB_ID", fb->id);
}
if (ret != 0) {
return false;
}
uint64_t crtc_x = (uint64_t)state->dst_box.x;
uint64_t crtc_y = (uint64_t)state->dst_box.y;
uint64_t crtc_w = (uint64_t)state->dst_box.width;
uint64_t crtc_h = (uint64_t)state->dst_box.height;
struct wlr_fbox src_box = state->src_box;
if (wlr_fbox_empty(&src_box)) {
src_box = (struct wlr_fbox){
.width = width,
.height = height,
};
}
uint64_t src_x = to_fp16(src_box.x);
uint64_t src_y = to_fp16(src_box.y);
uint64_t src_w = to_fp16(src_box.width);
uint64_t src_h = to_fp16(src_box.height);
uint32_t fb_damage_clips = 0;
if (state->damage != NULL) {
uint32_t *ptr = wl_array_add(fb_damage_clips_arr, sizeof(fb_damage_clips));
if (ptr == NULL) {
return false;
}
create_fb_damage_clips_blob(drm, width, height,
state->damage, &fb_damage_clips);
*ptr = fb_damage_clips;
}
return
liftoff_layer_set_property(layer->liftoff, "zpos", zpos) == 0 &&
liftoff_layer_set_property(layer->liftoff, "CRTC_X", crtc_x) == 0 &&
liftoff_layer_set_property(layer->liftoff, "CRTC_Y", crtc_y) == 0 &&
liftoff_layer_set_property(layer->liftoff, "CRTC_W", crtc_w) == 0 &&
liftoff_layer_set_property(layer->liftoff, "CRTC_H", crtc_h) == 0 &&
liftoff_layer_set_property(layer->liftoff, "SRC_X", src_x) == 0 &&
liftoff_layer_set_property(layer->liftoff, "SRC_Y", src_y) == 0 &&
liftoff_layer_set_property(layer->liftoff, "SRC_W", src_w) == 0 &&
liftoff_layer_set_property(layer->liftoff, "SRC_H", src_h) == 0 &&
liftoff_layer_set_property(layer->liftoff, "FB_DAMAGE_CLIPS", fb_damage_clips) == 0;
}
static bool devid_from_fd(int fd, dev_t *devid) {
struct stat stat;
if (fstat(fd, &stat) != 0) {
wlr_log_errno(WLR_ERROR, "fstat failed");
return false;
}
*devid = stat.st_rdev;
return true;
}
static void update_layer_feedback(struct wlr_drm_backend *drm,
struct wlr_drm_layer *layer) {
bool changed = false;
for (size_t i = 0; i < drm->num_planes; i++) {
struct wlr_drm_plane *plane = &drm->planes[i];
bool is_candidate = liftoff_layer_is_candidate_plane(layer->liftoff,
plane->liftoff);
if (layer->candidate_planes[i] != is_candidate) {
layer->candidate_planes[i] = is_candidate;
changed = true;
}
}
if (!changed) {
return;
}
dev_t target_device;
if (!devid_from_fd(drm->fd, &target_device)) {
return;
}
struct wlr_drm_format_set formats = {0};
for (size_t i = 0; i < drm->num_planes; i++) {
struct wlr_drm_plane *plane = &drm->planes[i];
if (!layer->candidate_planes[i]) {
continue;
}
for (size_t j = 0; j < plane->formats.len; j++) {
const struct wlr_drm_format *format = &plane->formats.formats[j];
for (size_t k = 0; k < format->len; k++) {
wlr_drm_format_set_add(&formats, format->format,
format->modifiers[k]);
}
}
}
struct wlr_output_layer_feedback_event event = {
.target_device = target_device,
.formats = &formats,
};
wl_signal_emit_mutable(&layer->wlr->events.feedback, &event);
wlr_drm_format_set_finish(&formats);
}
static bool add_connector(drmModeAtomicReq *req,
const struct wlr_drm_connector_state *state,
bool modeset, struct wl_array *fb_damage_clips_arr) {
struct wlr_drm_connector *conn = state->connector;
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struct wlr_drm_crtc *crtc = conn->crtc;
struct wlr_drm_backend *drm = conn->backend;
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bool active = state->active;
bool ok = true;
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ok = ok && add_prop(req, conn->id, conn->props.crtc_id,
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active ? crtc->id : 0);
if (modeset && active && conn->props.link_status != 0) {
ok = ok && add_prop(req, conn->id, conn->props.link_status,
DRM_MODE_LINK_STATUS_GOOD);
}
if (active && conn->props.content_type != 0) {
ok = ok && add_prop(req, conn->id, conn->props.content_type,
DRM_MODE_CONTENT_TYPE_GRAPHICS);
}
// TODO: set "max bpc"
ok = ok &&
add_prop(req, crtc->id, crtc->props.mode_id, state->mode_id) &&
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add_prop(req, crtc->id, crtc->props.active, active);
if (active) {
if (crtc->props.gamma_lut != 0) {
ok = ok && add_prop(req, crtc->id, crtc->props.gamma_lut, state->gamma_lut);
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}
if (crtc->props.vrr_enabled != 0) {
ok = ok && add_prop(req, crtc->id, crtc->props.vrr_enabled, state->vrr_enabled);
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}
ok = ok &&
set_plane_props(crtc->primary, crtc->primary->liftoff_layer, state->primary_fb, 0, 0, 0) &&
set_plane_props(crtc->primary, crtc->liftoff_composition_layer, state->primary_fb, 0, 0, 0);
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liftoff_layer_set_property(crtc->primary->liftoff_layer,
"FB_DAMAGE_CLIPS", state->fb_damage_clips);
liftoff_layer_set_property(crtc->liftoff_composition_layer,
"FB_DAMAGE_CLIPS", state->fb_damage_clips);
if (state->base->committed & WLR_OUTPUT_STATE_LAYERS) {
for (size_t i = 0; i < state->base->layers_len; i++) {
const struct wlr_output_layer_state *layer_state = &state->base->layers[i];
ok = ok && set_layer_props(drm, layer_state, i + 1,
fb_damage_clips_arr);
}
}
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if (crtc->cursor) {
if (drm_connector_is_cursor_visible(conn)) {
ok = ok && set_plane_props(crtc->cursor, crtc->cursor->liftoff_layer,
state->cursor_fb, conn->cursor_x, conn->cursor_y,
wl_list_length(&crtc->layers) + 1);
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} else {
ok = ok && disable_plane(crtc->cursor);
}
}
} else {
ok = ok && disable_plane(crtc->primary);
if (crtc->cursor) {
ok = ok && disable_plane(crtc->cursor);
}
}
return ok;
}
static void connector_update_layers_feedback(const struct wlr_drm_connector_state *state) {
struct wlr_drm_backend *drm = state->connector->backend;
if (!(state->base->committed & WLR_OUTPUT_STATE_LAYERS)) {
return;
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}
for (size_t i = 0; i < state->base->layers_len; i++) {
struct wlr_output_layer_state *layer_state = &state->base->layers[i];
struct wlr_drm_layer *layer = get_drm_layer(drm, layer_state->layer);
layer_state->accepted =
!liftoff_layer_needs_composition(layer->liftoff);
if (!layer_state->accepted) {
update_layer_feedback(drm, layer);
}
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}
}
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static bool commit(struct wlr_drm_backend *drm,
const struct wlr_drm_device_state *state,
struct wlr_drm_page_flip *page_flip, uint32_t flags, bool test_only) {
bool ok = false;
struct wl_array fb_damage_clips_arr = {0};
drmModeAtomicReq *req = NULL;
if (test_only) {
flags |= DRM_MODE_ATOMIC_TEST_ONLY;
}
if (state->modeset) {
flags |= DRM_MODE_ATOMIC_ALLOW_MODESET;
}
if (!test_only && state->nonblock) {
flags |= DRM_MODE_ATOMIC_NONBLOCK;
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}
for (size_t i = 0; i < state->connectors_len; i++) {
struct wlr_drm_connector_state *conn_state = &state->connectors[i];
struct wlr_drm_connector *conn = conn_state->connector;
if (state->modeset && !register_planes_for_crtc(drm, conn->crtc)) {
goto out;
}
if (!drm_atomic_connector_prepare(conn_state, state->modeset)) {
goto out;
}
}
req = drmModeAtomicAlloc();
if (req == NULL) {
wlr_log(WLR_ERROR, "drmModeAtomicAlloc failed");
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goto out;
}
for (size_t i = 0; i < state->connectors_len; i++) {
if (!add_connector(req, &state->connectors[i], state->modeset, &fb_damage_clips_arr)) {
goto out;
}
}
for (size_t i = 0; i < state->connectors_len; i++) {
struct wlr_drm_connector *conn = state->connectors[i].connector;
struct wlr_drm_crtc *crtc = conn->crtc;
int ret = liftoff_output_apply(crtc->liftoff, req, flags);
if (ret != 0) {
wlr_drm_conn_log(conn, test_only ? WLR_DEBUG : WLR_ERROR,
"liftoff_output_apply failed: %s", strerror(-ret));
goto out;
}
if (crtc->cursor &&
liftoff_layer_needs_composition(crtc->cursor->liftoff_layer)) {
wlr_drm_conn_log(conn, WLR_DEBUG, "Failed to scan-out cursor plane");
goto out;
}
}
ok = drmModeAtomicCommit(drm->fd, req, flags, page_flip) == 0;
if (!ok) {
wlr_log_errno(test_only ? WLR_DEBUG : WLR_ERROR,
"Atomic commit failed");
}
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out:
drmModeAtomicFree(req);
for (size_t i = 0; i < state->connectors_len; i++) {
struct wlr_drm_connector_state *conn_state = &state->connectors[i];
if (ok && !test_only) {
drm_atomic_connector_apply_commit(conn_state);
connector_update_layers_feedback(conn_state);
} else {
drm_atomic_connector_rollback_commit(conn_state);
}
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}
uint32_t *fb_damage_clips_ptr;
wl_array_for_each(fb_damage_clips_ptr, &fb_damage_clips_arr) {
if (drmModeDestroyPropertyBlob(drm->fd, *fb_damage_clips_ptr) != 0) {
wlr_log_errno(WLR_ERROR, "Failed to destroy FB_DAMAGE_CLIPS property blob");
}
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}
wl_array_release(&fb_damage_clips_arr);
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return ok;
}
const struct wlr_drm_interface liftoff_iface = {
.init = init,
.finish = finish,
.commit = commit,
.reset = drm_atomic_reset,
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};