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backend/drm: introduce pending and current CRTC state

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Previously, we only had the pending state (crtc->pending, crtc->mode and
crtc->active). This causes issues when a commit fails: the pending state
is left as-is, and the next commit may read stale data from it.

This will also cause issues when implementing test-only commits: we need
to rollback the pending CRTC state after a test-only commit.

Introduce separate pending and current CRTC states. Properly update the
current state after a commit.
This commit is contained in:
Simon Ser 2020-05-18 14:27:42 +02:00 • committed by Drew DeVault
parent d6cc718472
commit 15d8f1806e
4 changed files with 37 additions and 26 deletions
Download patch file Download diff file Expand all files Collapse all files

18
backend/drm/atomic.c
View file

@ -56,12 +56,12 @@ static void atomic_add(struct atomic *atom, uint32_t id, uint32_t prop, uint64_t
static bool create_mode_blob(struct wlr_drm_backend *drm, static bool create_mode_blob(struct wlr_drm_backend *drm,
struct wlr_drm_crtc *crtc, uint32_t *blob_id) { struct wlr_drm_crtc *crtc, uint32_t *blob_id) {
if (!crtc->active) { if (!crtc->pending.active) {
*blob_id = 0; *blob_id = 0;
return true; return true;
} }
if (drmModeCreatePropertyBlob(drm->fd, &crtc->mode, if (drmModeCreatePropertyBlob(drm->fd, &crtc->pending.mode->drm_mode,
sizeof(drmModeModeInfo), blob_id)) { sizeof(drmModeModeInfo), blob_id)) {
wlr_log_errno(WLR_ERROR, "Unable to create mode property blob"); wlr_log_errno(WLR_ERROR, "Unable to create mode property blob");
return false; return false;
@ -171,7 +171,7 @@ static bool atomic_crtc_commit(struct wlr_drm_backend *drm,
struct wlr_drm_crtc *crtc = conn->crtc; struct wlr_drm_crtc *crtc = conn->crtc;
uint32_t mode_id = crtc->mode_id; uint32_t mode_id = crtc->mode_id;
if (crtc->pending & WLR_DRM_CRTC_MODE) { if (crtc->pending_modeset) {
if (!create_mode_blob(drm, crtc, &mode_id)) { if (!create_mode_blob(drm, crtc, &mode_id)) {
return false; return false;
} }
@ -196,8 +196,7 @@ static bool atomic_crtc_commit(struct wlr_drm_backend *drm,
} }
} }
bool modeset = crtc->pending & WLR_DRM_CRTC_MODE; if (crtc->pending_modeset) {
if (modeset) {
flags |= DRM_MODE_ATOMIC_ALLOW_MODESET; flags |= DRM_MODE_ATOMIC_ALLOW_MODESET;
} else { } else {
flags |= DRM_MODE_ATOMIC_NONBLOCK; flags |= DRM_MODE_ATOMIC_NONBLOCK;
@ -206,14 +205,15 @@ static bool atomic_crtc_commit(struct wlr_drm_backend *drm,
struct atomic atom; struct atomic atom;
atomic_begin(&atom); atomic_begin(&atom);
atomic_add(&atom, conn->id, conn->props.crtc_id, atomic_add(&atom, conn->id, conn->props.crtc_id,
crtc->active ? crtc->id : 0); crtc->pending.active ? crtc->id : 0);
if (modeset && crtc->active && conn->props.link_status != 0) { if (crtc->pending_modeset && crtc->pending.active &&
conn->props.link_status != 0) {
atomic_add(&atom, conn->id, conn->props.link_status, atomic_add(&atom, conn->id, conn->props.link_status,
DRM_MODE_LINK_STATUS_GOOD); DRM_MODE_LINK_STATUS_GOOD);
} }
atomic_add(&atom, crtc->id, crtc->props.mode_id, mode_id); atomic_add(&atom, crtc->id, crtc->props.mode_id, mode_id);
atomic_add(&atom, crtc->id, crtc->props.active, crtc->active); atomic_add(&atom, crtc->id, crtc->props.active, crtc->pending.active);
if (crtc->active) { if (crtc->pending.active) {
if (crtc->props.gamma_lut != 0) { if (crtc->props.gamma_lut != 0) {
atomic_add(&atom, crtc->id, crtc->props.gamma_lut, gamma_lut); atomic_add(&atom, crtc->id, crtc->props.gamma_lut, gamma_lut);
} }

23
backend/drm/drm.c
View file

@ -336,7 +336,12 @@ static bool drm_crtc_commit(struct wlr_drm_connector *conn, uint32_t flags) {
get_drm_backend_from_backend(conn->output.backend); get_drm_backend_from_backend(conn->output.backend);
struct wlr_drm_crtc *crtc = conn->crtc; struct wlr_drm_crtc *crtc = conn->crtc;
bool ok = drm->iface->crtc_commit(drm, conn, flags); bool ok = drm->iface->crtc_commit(drm, conn, flags);
crtc->pending = 0; if (ok) {
memcpy(&crtc->current, &crtc->pending, sizeof(struct wlr_drm_crtc_state));
} else {
memcpy(&crtc->pending, &crtc->current, sizeof(struct wlr_drm_crtc_state));
}
crtc->pending_modeset = false;
return ok; return ok;
} }
@ -349,7 +354,7 @@ static bool drm_crtc_page_flip(struct wlr_drm_connector *conn) {
return false; return false;
} }
assert(crtc->active); assert(crtc->pending.active);
assert(plane_get_next_fb(crtc->primary)->type != WLR_DRM_FB_TYPE_NONE); assert(plane_get_next_fb(crtc->primary)->type != WLR_DRM_FB_TYPE_NONE);
if (!drm_crtc_commit(conn, DRM_MODE_PAGE_FLIP_EVENT)) { if (!drm_crtc_commit(conn, DRM_MODE_PAGE_FLIP_EVENT)) {
return false; return false;
@ -692,9 +697,9 @@ static bool drm_connector_init_renderer(struct wlr_drm_connector *conn,
} }
struct wlr_drm_plane *plane = crtc->primary; struct wlr_drm_plane *plane = crtc->primary;
crtc->pending |= WLR_DRM_CRTC_MODE; crtc->pending_modeset = true;
memcpy(&crtc->mode, &mode->drm_mode, sizeof(drmModeModeInfo)); crtc->pending.active = true;
crtc->active = true; crtc->pending.mode = mode;
int width = mode->wlr_mode.width; int width = mode->wlr_mode.width;
int height = mode->wlr_mode.height; int height = mode->wlr_mode.height;
@ -723,6 +728,10 @@ static bool drm_connector_init_renderer(struct wlr_drm_connector *conn,
"retrying without modifiers"); "retrying without modifiers");
modifiers = false; modifiers = false;
crtc->pending_modeset = true;
crtc->pending.active = true;
crtc->pending.mode = mode;
if (!drm_plane_init_surface(plane, drm, width, height, format, if (!drm_plane_init_surface(plane, drm, width, height, format,
0, modifiers)) { 0, modifiers)) {
return false; return false;
@ -767,8 +776,8 @@ bool drm_connector_set_mode(struct wlr_drm_connector *conn,
if (wlr_mode == NULL) { if (wlr_mode == NULL) {
if (conn->crtc != NULL) { if (conn->crtc != NULL) {
conn->crtc->active = false; conn->crtc->pending_modeset = true;
conn->crtc->pending |= WLR_DRM_CRTC_MODE; conn->crtc->pending.active = false;
if (!drm_crtc_commit(conn, 0)) { if (!drm_crtc_commit(conn, 0)) {
return false; return false;
} }

12
backend/drm/legacy.c
View file

@ -15,7 +15,7 @@ static bool legacy_crtc_commit(struct wlr_drm_backend *drm,
struct wlr_drm_plane *cursor = crtc->cursor; struct wlr_drm_plane *cursor = crtc->cursor;
uint32_t fb_id = 0; uint32_t fb_id = 0;
if (crtc->active) { if (crtc->pending.active) {
struct wlr_drm_fb *fb = plane_get_next_fb(crtc->primary); struct wlr_drm_fb *fb = plane_get_next_fb(crtc->primary);
struct gbm_bo *bo = drm_fb_acquire(fb, drm, &crtc->primary->mgpu_surf); struct gbm_bo *bo = drm_fb_acquire(fb, drm, &crtc->primary->mgpu_surf);
if (!bo) { if (!bo) {
@ -28,18 +28,20 @@ static bool legacy_crtc_commit(struct wlr_drm_backend *drm,
} }
} }
if (crtc->pending & WLR_DRM_CRTC_MODE) { if (crtc->pending_modeset) {
uint32_t *conns = NULL; uint32_t *conns = NULL;
size_t conns_len = 0; size_t conns_len = 0;
drmModeModeInfo *mode = NULL; drmModeModeInfo *mode = NULL;
if (crtc->active) { if (crtc->pending.mode != NULL) {
conns = &conn->id; conns = &conn->id;
conns_len = 1; conns_len = 1;
mode = &crtc->mode; mode = &crtc->pending.mode->drm_mode;
} }
uint32_t dpms = crtc->pending.active ?
DRM_MODE_DPMS_ON : DRM_MODE_DPMS_OFF;
if (drmModeConnectorSetProperty(drm->fd, conn->id, conn->props.dpms, if (drmModeConnectorSetProperty(drm->fd, conn->id, conn->props.dpms,
crtc->active ? DRM_MODE_DPMS_ON : DRM_MODE_DPMS_OFF) != 0) { dpms) != 0) {
wlr_log_errno(WLR_ERROR, "%s: failed to set DPMS property", wlr_log_errno(WLR_ERROR, "%s: failed to set DPMS property",
conn->output.name); conn->output.name);
return false; return false;

10
include/backend/drm/drm.h
View file

@ -42,16 +42,16 @@ struct wlr_drm_plane {
union wlr_drm_plane_props props; union wlr_drm_plane_props props;
}; };
enum wlr_drm_crtc_field { struct wlr_drm_crtc_state {
WLR_DRM_CRTC_MODE = 1 << 0, bool active;
struct wlr_drm_mode *mode;
}; };
struct wlr_drm_crtc { struct wlr_drm_crtc {
uint32_t id; uint32_t id;
uint32_t pending; // bitfield of enum wlr_drm_crtc_field
bool active; bool pending_modeset;
drmModeModeInfo mode; struct wlr_drm_crtc_state pending, current;
// Atomic modesetting only // Atomic modesetting only
uint32_t mode_id; uint32_t mode_id;