[Intel-gfx] [PATCH 05/19] drm/atomic-helper: remove backoff hack from disable/update_plane

[Daniel Vetter]

We can now properly retry at the top level, yay!

v2: Also remove the temporary acquire_ctx hack again, no longer
needed!

Signed-off-by: Daniel Vetter <daniel.vetter at intel.com>
---
 drivers/gpu/drm/drm_atomic_helper.c | 49 ++-----------------------------------
 drivers/gpu/drm/drm_plane.c         |  2 --
 2 files changed, 2 insertions(+), 49 deletions(-)

diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 1142075032a2..845378c92ccb 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -2102,8 +2102,7 @@ int drm_atomic_helper_update_plane(struct drm_plane *plane,
 	if (!state)
 		return -ENOMEM;
 
-	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(crtc);
-retry:
+	state->acquire_ctx = ctx;
 	plane_state = drm_atomic_get_plane_state(state, plane);
 	if (IS_ERR(plane_state)) {
 		ret = PTR_ERR(plane_state);
@@ -2128,24 +2127,8 @@ int drm_atomic_helper_update_plane(struct drm_plane *plane,
 
 	ret = drm_atomic_commit(state);
 fail:
-	if (ret == -EDEADLK)
-		goto backoff;
-
 	drm_atomic_state_put(state);
 	return ret;
-
-backoff:
-	drm_atomic_state_clear(state);
-	drm_atomic_legacy_backoff(state);
-
-	/*
-	 * Someone might have exchanged the framebuffer while we dropped locks
-	 * in the backoff code. We need to fix up the fb refcount tracking the
-	 * core does for us.
-	 */
-	plane->old_fb = plane->fb;
-
-	goto retry;
 }
 EXPORT_SYMBOL(drm_atomic_helper_update_plane);
 
@@ -2166,23 +2149,11 @@ int drm_atomic_helper_disable_plane(struct drm_plane *plane,
 	struct drm_plane_state *plane_state;
 	int ret = 0;
 
-	/*
-	 * FIXME: Without plane->crtc set we can't get at the implicit legacy
-	 * acquire context. The real fix will be to wire the acquire ctx through
-	 * everywhere we need it, but meanwhile prevent chaos by just skipping
-	 * this noop. The critical case is the cursor ioctls which a) only grab
-	 * crtc/cursor-plane locks (so we need the crtc to get at the right
-	 * acquire context) and b) can try to disable the plane multiple times.
-	 */
-	if (!plane->crtc)
-		return 0;
-
 	state = drm_atomic_state_alloc(plane->dev);
 	if (!state)
 		return -ENOMEM;
 
-	state->acquire_ctx = drm_modeset_legacy_acquire_ctx(plane->crtc);
-retry:
+	state->acquire_ctx = ctx;
 	plane_state = drm_atomic_get_plane_state(state, plane);
 	if (IS_ERR(plane_state)) {
 		ret = PTR_ERR(plane_state);
@@ -2198,24 +2169,8 @@ int drm_atomic_helper_disable_plane(struct drm_plane *plane,
 
 	ret = drm_atomic_commit(state);
 fail:
-	if (ret == -EDEADLK)
-		goto backoff;
-
 	drm_atomic_state_put(state);
 	return ret;
-
-backoff:
-	drm_atomic_state_clear(state);
-	drm_atomic_legacy_backoff(state);
-
-	/*
-	 * Someone might have exchanged the framebuffer while we dropped locks
-	 * in the backoff code. We need to fix up the fb refcount tracking the
-	 * core does for us.
-	 */
-	plane->old_fb = plane->fb;
-
-	goto retry;
 }
 EXPORT_SYMBOL(drm_atomic_helper_disable_plane);
 
diff --git a/drivers/gpu/drm/drm_plane.c b/drivers/gpu/drm/drm_plane.c
index 526e74b548b2..8535dc17db7e 100644
--- a/drivers/gpu/drm/drm_plane.c
+++ b/drivers/gpu/drm/drm_plane.c
@@ -554,7 +554,6 @@ static int setplane_internal(struct drm_plane *plane,
 	ret = drm_modeset_lock_all_ctx(plane->dev, &ctx);
 	if (ret)
 		goto fail;
-	plane->dev->mode_config.acquire_ctx = &ctx;
 	ret = __setplane_internal(plane, crtc, fb,
 				  crtc_x, crtc_y, crtc_w, crtc_h,
 				  src_x, src_y, src_w, src_h, &ctx);
@@ -649,7 +648,6 @@ static int drm_mode_cursor_universal(struct drm_crtc *crtc,
 	ret = drm_modeset_lock(&crtc->cursor->mutex, &ctx);
 	if (ret)
 		goto fail;
-	crtc->acquire_ctx = &ctx;
 
 	/*
 	 * Obtain fb we'll be using (either new or existing) and take an extra
-- 
2.11.0