Private objects storing a state shared across all CRTCs need to be carefully handled to avoid a use-after-free issue.
The proper way to do this to track all the commits using that shared state and wait for the previous commits to be done before going on with the current one to avoid the reordering of commits that could occur.
However, this commit setup needs to be done after drm_atomic_helper_setup_commit(), because before the CRTC commit structure hasn't been allocated before, and before the workqueue is scheduled, because we would be potentially reordered already otherwise.
That means that drivers currently have to roll their own drm_atomic_helper_commit() function, even though it would be identical if not for the commit setup.
Let's introduce a hook to do so that would be called as part of drm_atomic_helper_commit, allowing us to reuse the atomic helpers.
Suggested-by: Daniel Vetter daniel.vetter@ffwll.ch Signed-off-by: Maxime Ripard maxime@cerno.tech --- drivers/gpu/drm/drm_atomic_helper.c | 9 +++++++++ include/drm/drm_modeset_helper_vtables.h | 21 +++++++++++++++++++++ 2 files changed, 30 insertions(+)
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c index f9170b4b22e7..f754e21b96eb 100644 --- a/drivers/gpu/drm/drm_atomic_helper.c +++ b/drivers/gpu/drm/drm_atomic_helper.c @@ -2034,6 +2034,9 @@ crtc_or_fake_commit(struct drm_atomic_state *state, struct drm_crtc *crtc) * should always call this function from their * &drm_mode_config_funcs.atomic_commit hook. * + * Drivers that need to extend the commit setup to private objects can use the + * &drm_mode_config_helper_funcs.atomic_commit_setup hook. + * * To be able to use this support drivers need to use a few more helper * functions. drm_atomic_helper_wait_for_dependencies() must be called before * actually committing the hardware state, and for nonblocking commits this call @@ -2077,8 +2080,11 @@ int drm_atomic_helper_setup_commit(struct drm_atomic_state *state, struct drm_plane *plane; struct drm_plane_state *old_plane_state, *new_plane_state; struct drm_crtc_commit *commit; + const struct drm_mode_config_helper_funcs *funcs; int i, ret;
+ funcs = state->dev->mode_config.helper_private; + for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, new_crtc_state, i) { commit = kzalloc(sizeof(*commit), GFP_KERNEL); if (!commit) @@ -2155,6 +2161,9 @@ int drm_atomic_helper_setup_commit(struct drm_atomic_state *state, new_plane_state->commit = drm_crtc_commit_get(commit); }
+ if (funcs && funcs->atomic_commit_setup) + return funcs->atomic_commit_setup(state); + return 0; } EXPORT_SYMBOL(drm_atomic_helper_setup_commit); diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h index 4efec30f8bad..0ebb3f191bbc 100644 --- a/include/drm/drm_modeset_helper_vtables.h +++ b/include/drm/drm_modeset_helper_vtables.h @@ -1406,6 +1406,27 @@ struct drm_mode_config_helper_funcs { * drm_atomic_helper_commit_tail(). */ void (*atomic_commit_tail)(struct drm_atomic_state *state); + + /** + * @atomic_commit_setup: + * + * This hook is used by the default atomic_commit() hook implemented in + * drm_atomic_helper_commit() together with the nonblocking helpers (see + * drm_atomic_helper_setup_commit()) to extend the DRM commit setup. It + * is not used by the atomic helpers. + * + * This function is called at the end of + * drm_atomic_helper_setup_commit(), so once the commit has been + * properly setup across the generic DRM object states. It allows + * drivers to do some additional commit tracking that isn't related to a + * CRTC, plane or connector, tracked in a &drm_private_obj structure. + * + * Note that the documentation of &drm_private_obj has more details on + * how one should implement this. + * + * This hook is optional. + */ + int (*atomic_commit_setup)(struct drm_atomic_state *state); };
#endif