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wlroots-hyprland/backend/drm/atomic.c
Simon Ser d36dd96e8d backend/drm: set "max bpc" property based on pixel format 
Since 1d581656c7 ("backend/drm: set "max bpc" to the max") we
set the "max bpc" property to the maximum value. The kernel driver
is supposed to clamp this value depending on hardware capabilities.

All kernel drivers lower the value depending on the GPU capabilities.
However, none of the drivers lower the value depending on the DP-MST
link capabilities. Thus, enabling a 4k@60Hz mode can fail on some
DP-MST setups due to the "max bpc" property.

Additionally, it's not a good idea to unconditionally set "max bpc"
to the max. A high bpc consumes more lanes and more clock speed,
which means higher power consumption and the busy lanes cannot be
used for something else (e.g. other data transfers on a USB-C cable).

For now, let's tie the "max bpc" to the pixel format of the buffer.
Introduce a heuristic to make "high bit-depth buffer" a synonym of
"I want the best quality".

This is not perfect: a "max bpc" higher than 8 might be desirable
for pixel formats with a color depth of 8 bits, for instance when
the color management KMS properties are used. But we don't really
support that yet, so let's leave this for later.

Closes: https://github.com/swaywm/sway/issues/7367
2023-01-31 09:32:11 +00:00

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#define _POSIX_C_SOURCE 200809L
#include <drm_fourcc.h>
#include <stdlib.h>
#include <stdio.h>
#include <wlr/util/log.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
#include "backend/drm/drm.h"
#include "backend/drm/iface.h"
#include "backend/drm/util.h"
static char *atomic_commit_flags_str(uint32_t flags) {
const char *const l[] = {
(flags & DRM_MODE_PAGE_FLIP_EVENT) ? "PAGE_FLIP_EVENT" : NULL,
(flags & DRM_MODE_PAGE_FLIP_ASYNC) ? "PAGE_FLIP_ASYNC" : NULL,
(flags & DRM_MODE_ATOMIC_TEST_ONLY) ? "ATOMIC_TEST_ONLY" : NULL,
(flags & DRM_MODE_ATOMIC_NONBLOCK) ? "ATOMIC_NONBLOCK" : NULL,
(flags & DRM_MODE_ATOMIC_ALLOW_MODESET) ? "ATOMIC_ALLOW_MODESET" : NULL,
};
char *buf = NULL;
size_t size = 0;
FILE *f = open_memstream(&buf, &size);
if (f == NULL) {
return NULL;
}
for (size_t i = 0; i < sizeof(l) / sizeof(l[0]); i++) {
if (l[i] == NULL) {
continue;
}
if (ftell(f) > 0) {
fprintf(f, " | ");
}
fprintf(f, "%s", l[i]);
}
if (ftell(f) == 0) {
fprintf(f, "none");
}
fclose(f);
return buf;
}
struct atomic {
drmModeAtomicReq *req;
bool failed;
};
static void atomic_begin(struct atomic *atom) {
memset(atom, 0, sizeof(*atom));
atom->req = drmModeAtomicAlloc();
if (!atom->req) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
atom->failed = true;
return;
}
}
static bool atomic_commit(struct atomic *atom,
struct wlr_drm_connector *conn, uint32_t flags) {
struct wlr_drm_backend *drm = conn->backend;
if (atom->failed) {
return false;
}
int ret = drmModeAtomicCommit(drm->fd, atom->req, flags, drm);
if (ret != 0) {
wlr_drm_conn_log_errno(conn,
(flags & DRM_MODE_ATOMIC_TEST_ONLY) ? WLR_DEBUG : WLR_ERROR,
"Atomic commit failed");
char *flags_str = atomic_commit_flags_str(flags);
wlr_log(WLR_DEBUG, "(Atomic commit flags: %s)",
flags_str ? flags_str : "<error>");
free(flags_str);
return false;
}
return true;
}
static void atomic_finish(struct atomic *atom) {
drmModeAtomicFree(atom->req);
}
static void atomic_add(struct atomic *atom, uint32_t id, uint32_t prop, uint64_t val) {
if (!atom->failed && drmModeAtomicAddProperty(atom->req, id, prop, val) < 0) {
wlr_log_errno(WLR_ERROR, "Failed to add atomic DRM property");
atom->failed = true;
}
}
static bool create_mode_blob(struct wlr_drm_backend *drm,
struct wlr_drm_connector *conn,
const struct wlr_drm_connector_state *state, uint32_t *blob_id) {
if (!state->active) {
*blob_id = 0;
return true;
}
if (drmModeCreatePropertyBlob(drm->fd, &state->mode,
sizeof(drmModeModeInfo), blob_id)) {
wlr_log_errno(WLR_ERROR, "Unable to create mode property blob");
return false;
}
return true;
}
static bool create_gamma_lut_blob(struct wlr_drm_backend *drm,
size_t size, const uint16_t *lut, uint32_t *blob_id) {
if (size == 0) {
*blob_id = 0;
return true;
}
struct drm_color_lut *gamma = malloc(size * sizeof(struct drm_color_lut));
if (gamma == NULL) {
wlr_log(WLR_ERROR, "Failed to allocate gamma table");
return false;
}
const uint16_t *r = lut;
const uint16_t *g = lut + size;
const uint16_t *b = lut + 2 * size;
for (size_t i = 0; i < size; i++) {
gamma[i].red = r[i];
gamma[i].green = g[i];
gamma[i].blue = b[i];
}
if (drmModeCreatePropertyBlob(drm->fd, gamma,
size * sizeof(struct drm_color_lut), blob_id) != 0) {
wlr_log_errno(WLR_ERROR, "Unable to create gamma LUT property blob");
free(gamma);
return false;
}
free(gamma);
return true;
}
static uint64_t max_bpc_for_format(uint32_t format) {
switch (format) {
case DRM_FORMAT_XRGB2101010:
case DRM_FORMAT_ARGB2101010:
case DRM_FORMAT_XBGR2101010:
case DRM_FORMAT_ABGR2101010:
return 10;
case DRM_FORMAT_XBGR16161616F:
case DRM_FORMAT_ABGR16161616F:
case DRM_FORMAT_XBGR16161616:
case DRM_FORMAT_ABGR16161616:
return 16;
default:
return 8;
}
}
static uint64_t pick_max_bpc(struct wlr_drm_connector *conn, struct wlr_drm_fb *fb) {
uint32_t format = DRM_FORMAT_INVALID;
struct wlr_dmabuf_attributes attribs = {0};
if (wlr_buffer_get_dmabuf(fb->wlr_buf, &attribs)) {
format = attribs.format;
}
uint64_t target_bpc = max_bpc_for_format(format);
if (target_bpc < conn->max_bpc_bounds[0]) {
target_bpc = conn->max_bpc_bounds[0];
}
if (target_bpc > conn->max_bpc_bounds[1]) {
target_bpc = conn->max_bpc_bounds[1];
}
return target_bpc;
}
static void commit_blob(struct wlr_drm_backend *drm,
uint32_t *current, uint32_t next) {
if (*current == next) {
return;
}
if (*current != 0) {
drmModeDestroyPropertyBlob(drm->fd, *current);
}
*current = next;
}
static void rollback_blob(struct wlr_drm_backend *drm,
uint32_t *current, uint32_t next) {
if (*current == next) {
return;
}
if (next != 0) {
drmModeDestroyPropertyBlob(drm->fd, next);
}
}
static void plane_disable(struct atomic *atom, struct wlr_drm_plane *plane) {
uint32_t id = plane->id;
const union wlr_drm_plane_props *props = &plane->props;
atomic_add(atom, id, props->fb_id, 0);
atomic_add(atom, id, props->crtc_id, 0);
}
static void set_plane_props(struct atomic *atom, struct wlr_drm_backend *drm,
struct wlr_drm_plane *plane, struct wlr_drm_fb *fb, uint32_t crtc_id,
int32_t x, int32_t y) {
uint32_t id = plane->id;
const union wlr_drm_plane_props *props = &plane->props;
if (fb == NULL) {
wlr_log(WLR_ERROR, "Failed to acquire FB for plane %"PRIu32, plane->id);
atom->failed = true;
return;
}
uint32_t width = fb->wlr_buf->width;
uint32_t height = fb->wlr_buf->height;
// The src_* properties are in 16.16 fixed point
atomic_add(atom, id, props->src_x, 0);
atomic_add(atom, id, props->src_y, 0);
atomic_add(atom, id, props->src_w, (uint64_t)width << 16);
atomic_add(atom, id, props->src_h, (uint64_t)height << 16);
atomic_add(atom, id, props->crtc_w, width);
atomic_add(atom, id, props->crtc_h, height);
atomic_add(atom, id, props->fb_id, fb->id);
atomic_add(atom, id, props->crtc_id, crtc_id);
atomic_add(atom, id, props->crtc_x, (uint64_t)x);
atomic_add(atom, id, props->crtc_y, (uint64_t)y);
}
static bool atomic_crtc_commit(struct wlr_drm_connector *conn,
const struct wlr_drm_connector_state *state, uint32_t flags,
bool test_only) {
struct wlr_drm_backend *drm = conn->backend;
struct wlr_output *output = &conn->output;
struct wlr_drm_crtc *crtc = conn->crtc;
bool modeset = state->modeset;
bool active = state->active;
uint32_t mode_id = crtc->mode_id;
if (modeset) {
if (!create_mode_blob(drm, conn, state, &mode_id)) {
return false;
}
}
uint32_t gamma_lut = crtc->gamma_lut;
if (state->base->committed & WLR_OUTPUT_STATE_GAMMA_LUT) {
// Fallback to legacy gamma interface when gamma properties are not
// available (can happen on older Intel GPUs that support gamma but not
// degamma).
if (crtc->props.gamma_lut == 0) {
if (!drm_legacy_crtc_set_gamma(drm, crtc,
state->base->gamma_lut_size,
state->base->gamma_lut)) {
return false;
}
} else {
if (!create_gamma_lut_blob(drm, state->base->gamma_lut_size,
state->base->gamma_lut, &gamma_lut)) {
return false;
}
}
}
uint32_t fb_damage_clips = 0;
if ((state->base->committed & WLR_OUTPUT_STATE_DAMAGE) &&
pixman_region32_not_empty(&state->base->damage) &&
crtc->primary->props.fb_damage_clips != 0) {
int rects_len;
const pixman_box32_t *rects =
pixman_region32_rectangles(&state->base->damage, &rects_len);
if (drmModeCreatePropertyBlob(drm->fd, rects,
sizeof(*rects) * rects_len, &fb_damage_clips) != 0) {
wlr_log_errno(WLR_ERROR, "Failed to create FB_DAMAGE_CLIPS property blob");
}
}
bool prev_vrr_enabled =
output->adaptive_sync_status == WLR_OUTPUT_ADAPTIVE_SYNC_ENABLED;
bool vrr_enabled = prev_vrr_enabled;
if ((state->base->committed & WLR_OUTPUT_STATE_ADAPTIVE_SYNC_ENABLED)) {
if (!drm_connector_supports_vrr(conn)) {
return false;
}
vrr_enabled = state->base->adaptive_sync_enabled;
}
if (test_only) {
flags |= DRM_MODE_ATOMIC_TEST_ONLY;
}
if (modeset) {
flags |= DRM_MODE_ATOMIC_ALLOW_MODESET;
} else if (!test_only && (state->base->committed & WLR_OUTPUT_STATE_BUFFER)) {
// The wlr_output API requires non-modeset commits with a new buffer to
// wait for the frame event. However compositors often perform
// non-modesets commits without a new buffer without waiting for the
// frame event. In that case we need to make the KMS commit blocking,
// otherwise the kernel will error out with EBUSY.
flags |= DRM_MODE_ATOMIC_NONBLOCK;
}
struct atomic atom;
atomic_begin(&atom);
atomic_add(&atom, conn->id, conn->props.crtc_id, active ? crtc->id : 0);
if (modeset && active && conn->props.link_status != 0) {
atomic_add(&atom, conn->id, conn->props.link_status,
DRM_MODE_LINK_STATUS_GOOD);
}
if (active && conn->props.content_type != 0) {
atomic_add(&atom, conn->id, conn->props.content_type,
DRM_MODE_CONTENT_TYPE_GRAPHICS);
}
if (modeset && active && conn->props.max_bpc != 0 && conn->max_bpc_bounds[1] != 0) {
atomic_add(&atom, conn->id, conn->props.max_bpc, pick_max_bpc(conn, state->primary_fb));
}
atomic_add(&atom, crtc->id, crtc->props.mode_id, mode_id);
atomic_add(&atom, crtc->id, crtc->props.active, active);
if (active) {
if (crtc->props.gamma_lut != 0) {
atomic_add(&atom, crtc->id, crtc->props.gamma_lut, gamma_lut);
}
if (crtc->props.vrr_enabled != 0) {
atomic_add(&atom, crtc->id, crtc->props.vrr_enabled, vrr_enabled);
}
set_plane_props(&atom, drm, crtc->primary, state->primary_fb, crtc->id,
0, 0);
if (crtc->primary->props.fb_damage_clips != 0) {
atomic_add(&atom, crtc->primary->id,
crtc->primary->props.fb_damage_clips, fb_damage_clips);
}
if (crtc->cursor) {
if (drm_connector_is_cursor_visible(conn)) {
set_plane_props(&atom, drm, crtc->cursor, get_next_cursor_fb(conn),
crtc->id, conn->cursor_x, conn->cursor_y);
} else {
plane_disable(&atom, crtc->cursor);
}
}
} else {
plane_disable(&atom, crtc->primary);
if (crtc->cursor) {
plane_disable(&atom, crtc->cursor);
}
}
bool ok = atomic_commit(&atom, conn, flags);
atomic_finish(&atom);
if (ok && !test_only) {
commit_blob(drm, &crtc->mode_id, mode_id);
commit_blob(drm, &crtc->gamma_lut, gamma_lut);
if (vrr_enabled != prev_vrr_enabled) {
output->adaptive_sync_status = vrr_enabled ?
WLR_OUTPUT_ADAPTIVE_SYNC_ENABLED :
WLR_OUTPUT_ADAPTIVE_SYNC_DISABLED;
wlr_drm_conn_log(conn, WLR_DEBUG, "VRR %s",
vrr_enabled ? "enabled" : "disabled");
}
} else {
rollback_blob(drm, &crtc->mode_id, mode_id);
rollback_blob(drm, &crtc->gamma_lut, gamma_lut);
}
if (fb_damage_clips != 0 &&
drmModeDestroyPropertyBlob(drm->fd, fb_damage_clips) != 0) {
wlr_log_errno(WLR_ERROR, "Failed to destroy FB_DAMAGE_CLIPS property blob");
}
return ok;
}
const struct wlr_drm_interface atomic_iface = {
.crtc_commit = atomic_crtc_commit,
};
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