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backend/drm: rollback atomic blobs 

If the atomic commit fails or is test-only, rollback
wlr_drm_crtc.{mode_id,gamma_lut} blob IDs to their previous value. This
prevents the next commits from failing or applying test-only state.
This commit is contained in:
Simon Ser 2020-05-18 10:34:24 +02:00 committed by Drew DeVault
parent 0758a4fc9d
commit 47e5212823
1 changed files with 36 additions and 13 deletions
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49
backend/drm/atomic.c
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@ -103,6 +103,27 @@ static bool create_gamma_lut_blob(struct wlr_drm_backend *drm,
return true;
}
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;
@ -149,16 +170,14 @@ static bool atomic_crtc_commit(struct wlr_drm_backend *drm,
struct wlr_output *output = &conn->output;
struct wlr_drm_crtc *crtc = conn->crtc;
uint32_t mode_id = crtc->mode_id;
if (crtc->pending & WLR_DRM_CRTC_MODE) {
if (crtc->mode_id != 0) {
drmModeDestroyPropertyBlob(drm->fd, crtc->mode_id);
}
if (!create_mode_blob(drm, crtc, &crtc->mode_id)) {
if (!create_mode_blob(drm, crtc, &mode_id)) {
return false;
}
}
uint32_t gamma_lut = crtc->gamma_lut;
if (output->pending.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
@ -170,13 +189,8 @@ static bool atomic_crtc_commit(struct wlr_drm_backend *drm,
return false;
}
} else {
if (crtc->gamma_lut != 0) {
drmModeDestroyPropertyBlob(drm->fd, crtc->gamma_lut);
}
wlr_log(WLR_ERROR, "setting gamma LUT %zu", output->pending.gamma_lut_size);
if (!create_gamma_lut_blob(drm, output->pending.gamma_lut_size,
output->pending.gamma_lut, &crtc->gamma_lut)) {
output->pending.gamma_lut, &gamma_lut)) {
return false;
}
}
@ -197,11 +211,11 @@ static bool atomic_crtc_commit(struct wlr_drm_backend *drm,
atomic_add(&atom, conn->id, conn->props.link_status,
DRM_MODE_LINK_STATUS_GOOD);
}
atomic_add(&atom, crtc->id, crtc->props.mode_id, crtc->mode_id);
atomic_add(&atom, crtc->id, crtc->props.mode_id, mode_id);
atomic_add(&atom, crtc->id, crtc->props.active, crtc->active);
if (crtc->active) {
if (crtc->props.gamma_lut != 0) {
atomic_add(&atom, crtc->id, crtc->props.gamma_lut, crtc->gamma_lut);
atomic_add(&atom, crtc->id, crtc->props.gamma_lut, gamma_lut);
}
set_plane_props(&atom, drm, crtc->primary, crtc->id, 0, 0);
if (crtc->cursor) {
@ -221,6 +235,15 @@ static bool atomic_crtc_commit(struct wlr_drm_backend *drm,
bool ok = atomic_commit(&atom, conn, flags);
atomic_finish(&atom);
if (ok && !(flags & DRM_MODE_ATOMIC_TEST_ONLY)) {
commit_blob(drm, &crtc->mode_id, mode_id);
commit_blob(drm, &crtc->gamma_lut, gamma_lut);
} else {
rollback_blob(drm, &crtc->mode_id, mode_id);
rollback_blob(drm, &crtc->gamma_lut, gamma_lut);
}
return ok;
}