diff options
| author | Simon Ser <contact@emersion.fr> | 2023-07-14 11:13:03 +0000 |
|---|---|---|
| committer | Simon Ser <contact@emersion.fr> | 2023-07-20 12:01:03 +0200 |
| commit | c7a472297169156252a50d76965eb36b081186e2 (patch) | |
| tree | 64c78cdf142d8061fa834af9c07e28e5f8b7706b /drivers/gpu/drm/drm_internal.h | |
| parent | 4f66feeab173bd73e71028b8c2e1dcea07e32dd5 (diff) | |
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 'drivers/gpu/drm/drm_internal.h')
| -rw-r--r-- | drivers/gpu/drm/drm_internal.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_internal.h b/drivers/gpu/drm/drm_internal.h index d7e023bbb0d5..ba12acd55139 100644 --- a/drivers/gpu/drm/drm_internal.h +++ b/drivers/gpu/drm/drm_internal.h @@ -245,6 +245,8 @@ int drm_syncobj_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file_private); int drm_syncobj_timeline_wait_ioctl(struct drm_device *dev, void *data, struct drm_file *file_private); +int drm_syncobj_eventfd_ioctl(struct drm_device *dev, void *data, + struct drm_file *file_private); int drm_syncobj_reset_ioctl(struct drm_device *dev, void *data, struct drm_file *file_private); int drm_syncobj_signal_ioctl(struct drm_device *dev, void *data, |