diff options
| author | Simon Ser <contact@emersion.fr> | 2023-07-14 14:13:03 +0300 |
|---|---|---|
| committer | Simon Ser <contact@emersion.fr> | 2023-07-20 13:01:03 +0300 |
| commit | c7a472297169156252a50d76965eb36b081186e2 (patch) | |
| tree | 64c78cdf142d8061fa834af9c07e28e5f8b7706b /include/drm/drm_syncobj.h | |
| parent | 4f66feeab173bd73e71028b8c2e1dcea07e32dd5 (diff) | |
| download | linux-c7a472297169156252a50d76965eb36b081186e2.tar.xz | |
drm/syncobj: add IOCTL to register an eventfd
Introduce a new DRM_IOCTL_SYNCOBJ_EVENTFD IOCTL which signals an
eventfd from a syncobj.
This is useful for Wayland compositors to handle wait-before-submit.
Wayland clients can send a timeline point to the compositor
before the point has materialized yet, then compositors can wait
for the point to materialize via this new IOCTL.
The existing DRM_IOCTL_SYNCOBJ_TIMELINE_WAIT IOCTL is not suitable
because it blocks. Compositors want to integrate the wait with
their poll(2)-based event loop.
Requirements for new uAPI:
- User-space patch: https://gitlab.freedesktop.org/wlroots/wlroots/-/merge_requests/4262
- IGT: https://lists.freedesktop.org/archives/igt-dev/2023-July/057893.html
v2:
- Wait for fence when flags is zero
- Improve documentation (Pekka)
- Rename IOCTL (Christian)
- Fix typo in drm_syncobj_add_eventfd() (Christian)
v3:
- Link user-space + IGT patches
- Add reference from overview docs
v4: fix IOCTL number conflict with GETFB2 (Nicholas Choi, Vitaly Prosyak)
Signed-off-by: Simon Ser <contact@emersion.fr>
Reviewed-by: Christian König <christian.koenig@amd.com>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Cc: Jason Ekstrand <jason@jlekstrand.net>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Cc: Daniel Stone <daniel@fooishbar.org>
Cc: James Jones <jajones@nvidia.com>
Cc: Austin Shafer <ashafer@nvidia.com>
Cc: Vitaly Prosyak <vprosyak@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230714111257.11940-1-contact@emersion.fr
Diffstat (limited to 'include/drm/drm_syncobj.h')
| -rw-r--r-- | include/drm/drm_syncobj.h | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/include/drm/drm_syncobj.h b/include/drm/drm_syncobj.h index 6cf7243a1dc5..b40052132e52 100644 --- a/include/drm/drm_syncobj.h +++ b/include/drm/drm_syncobj.h @@ -54,7 +54,11 @@ struct drm_syncobj { */ struct list_head cb_list; /** - * @lock: Protects &cb_list and write-locks &fence. + * @ev_fd_list: List of registered eventfd. + */ + struct list_head ev_fd_list; + /** + * @lock: Protects &cb_list and &ev_fd_list, and write-locks &fence. */ spinlock_t lock; /** |