wlroots-hyprland/backend/drm/atomic.c

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#define _POSIX_C_SOURCE 200809L
#include <drm_fourcc.h>
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#include <stdlib.h>
#include <stdio.h>
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#include <wlr/util/log.h>
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#include <xf86drm.h>
#include <xf86drmMode.h>
#include "backend/drm/drm.h"
#include "backend/drm/iface.h"
#include "backend/drm/util.h"
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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;
}
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struct atomic {
drmModeAtomicReq *req;
bool failed;
};
static void atomic_begin(struct atomic *atom) {
*atom = (struct atomic){0};
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atom->req = drmModeAtomicAlloc();
if (!atom->req) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
atom->failed = true;
return;
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}
}
static bool atomic_commit(struct atomic *atom,
struct wlr_drm_connector *conn, uint32_t flags) {
struct wlr_drm_backend *drm = conn->backend;
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if (atom->failed) {
return false;
}
int ret = drmModeAtomicCommit(drm->fd, atom->req, flags, drm);
// A non-blocking commit will fail with EBUSY if a commit is already in
// progress for the affected CRTCs, and the caller is responsible for
// waiting for page_flip events before queuing more non-blocking commits.
//
// The driver may implicitly add more CRTCs to our commit for e.g. resource
// reallocation, and in that case we have no chance of waiting for the
// right page_flip events. Retry with a blocking commit when this happens.
if (ret == -EBUSY &&
(flags & DRM_MODE_ATOMIC_NONBLOCK) &&
(flags & DRM_MODE_ATOMIC_ALLOW_MODESET)) {
flags &= ~DRM_MODE_ATOMIC_NONBLOCK;
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;
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}
return true;
}
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static void atomic_finish(struct atomic *atom) {
drmModeAtomicFree(atom->req);
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}
static void atomic_add(struct atomic *atom, uint32_t id, uint32_t prop, uint64_t val) {
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if (!atom->failed && drmModeAtomicAddProperty(atom->req, id, prop, val) < 0) {
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wlr_log_errno(WLR_ERROR, "Failed to add atomic DRM property");
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atom->failed = true;
}
}
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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;
}
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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(*gamma));
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(*gamma), blob_id) != 0) {
wlr_log_errno(WLR_ERROR, "Unable to create gamma LUT property blob");
free(gamma);
return false;
}
free(gamma);
return true;
}
bool create_fb_damage_clips_blob(struct wlr_drm_backend *drm,
int width, int height, const pixman_region32_t *damage, uint32_t *blob_id) {
if (!pixman_region32_not_empty(damage)) {
*blob_id = 0;
return true;
}
pixman_region32_t clipped;
pixman_region32_init(&clipped);
pixman_region32_intersect_rect(&clipped, damage, 0, 0, width, height);
int rects_len;
const pixman_box32_t *rects = pixman_region32_rectangles(&clipped, &rects_len);
int ret = drmModeCreatePropertyBlob(drm->fd, rects, sizeof(*rects) * rects_len, blob_id);
pixman_region32_fini(&clipped);
if (ret != 0) {
wlr_log_errno(WLR_ERROR, "Failed to create FB_DAMAGE_CLIPS property blob");
return false;
}
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) {
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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;
}
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uint32_t width = fb->wlr_buf->width;
uint32_t height = fb->wlr_buf->height;
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// 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);
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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);
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}
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)) {
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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) &&
crtc->primary->props.fb_damage_clips != 0) {
create_fb_damage_clips_blob(drm, state->primary_fb->wlr_buf->width,
state->primary_fb->wlr_buf->height, &state->base->damage, &fb_damage_clips);
}
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;
}
if (!test_only && conn->pending_page_flip_crtc == 0) {
flags |= DRM_MODE_ATOMIC_NONBLOCK;
}
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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;
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}
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const struct wlr_drm_interface atomic_iface = {
.crtc_commit = atomic_crtc_commit,
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};