[PATCH 21/26] drm: use new iterator in drm_gem_plane_helper_prepare_fb v2
From: "Christian König" <ckoenig.leichtzumerken@gmail.com>
Date: 2021-09-17 12:35:37
Also in:
dri-devel, intel-gfx
Subsystem:
drm drivers, drm drivers and misc gpu patches, the rest · Maintainers:
David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Linus Torvalds
Makes the handling a bit more complex, but avoids the use of dma_resv_get_excl_unlocked(). v2: add missing rcu_read_lock()/unlock() Signed-off-by: Christian König <christian.koenig@amd.com> --- drivers/gpu/drm/drm_gem_atomic_helper.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_gem_atomic_helper.c b/drivers/gpu/drm/drm_gem_atomic_helper.c
index e570398abd78..d8f9c6432544 100644
--- a/drivers/gpu/drm/drm_gem_atomic_helper.c
+++ b/drivers/gpu/drm/drm_gem_atomic_helper.c@@ -143,6 +143,7 @@ */ int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state) { + struct dma_resv_iter cursor; struct drm_gem_object *obj; struct dma_fence *fence;
@@ -150,9 +151,18 @@ int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_st return 0; obj = drm_gem_fb_get_obj(state->fb, 0); - fence = dma_resv_get_excl_unlocked(obj->resv); - drm_atomic_set_fence_for_plane(state, fence); + rcu_read_lock(); + dma_resv_iter_begin(&cursor, obj->resv, false); + dma_resv_for_each_fence_unlocked(&cursor, fence) { + rcu_read_unlock(); + /* TODO: We only use the first write fence here */ + drm_atomic_set_fence_for_plane(state, fence); + return 0; + } + dma_resv_iter_end(&cursor); + rcu_read_unlock(); + drm_atomic_set_fence_for_plane(state, NULL); return 0; } EXPORT_SYMBOL_GPL(drm_gem_plane_helper_prepare_fb);
--
2.25.1