[PATCH v2 0/2] drm: Add new plane helpers to begin/end FB access

[Thomas Zimmermann]

ping. Any comments?

Am 25.10.22 um 12:17 schrieb Thomas Zimmermann:
> This patchset adds the callbacks begin_fb_access and end_fb_access
> to struct drm_plane_helper_funcs. They provide hooks to acquire and
> release resources that are only held during the commit. It adds
> related simple-KMS helpers and converts shadow-plane helpers.
> 
> As resource allocation often can fail, we have to do this before an
> atomic commit starts the update in order to handle the error. But
> prepare_fb is only reverted after the next pageflip. We want to
> reduce the time resources are held for a commit, which requires the
> new hooks.
> 
> With this in place, move shadow-plane helpers' automatic vmap/vunmap
> behind the new callbacks. The shadow-plane mapping is only required
> during the atomic commit.
> 
> Tested with combinations of radeon, udl and simpledrm under X11, Weston
> and Wayland-Gnome.
> 
> Thomas Zimmermann (2):
>    drm/atomic-helper: Add {begin,end}_fb_access to plane helpers
>    drm/gem: Implement shadow-plane {begin,end}_fb_access with vmap
> 
>   drivers/gpu/drm/drm_atomic_helper.c      | 34 ++++++++++--
>   drivers/gpu/drm/drm_gem_atomic_helper.c  | 66 +++++++++++-------------
>   drivers/gpu/drm/drm_simple_kms_helper.c  | 26 ++++++++++
>   include/drm/drm_gem_atomic_helper.h      | 20 +++----
>   include/drm/drm_modeset_helper_vtables.h | 41 ++++++++++++++-
>   include/drm/drm_simple_kms_helper.h      | 20 +++++++
>   6 files changed, 157 insertions(+), 50 deletions(-)
> 
> 
> base-commit: 746559738f1335241ea686566cb654847c20d7a4

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Ivo Totev
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