diff options
| author | Jason Ekstrand <jason@jlekstrand.net> | 2017-08-28 14:10:28 -0700 |
|---|---|---|
| committer | Dave Airlie <airlied@redhat.com> | 2017-08-29 10:16:25 +1000 |
| commit | ffa9443fb3d3eddf0fdf6ac473dc8b5c87f08f15 (patch) | |
| tree | 516a051cc991d6f093f9533c345870acfc6f1352 /drivers/gpu/drm/drm_ioctl.c | |
| parent | aa4035d2c7683d2f2fb0ffe8087abd9eabf6d54a (diff) | |
drm/syncobj: Add a signal ioctl (v3)
This IOCTL provides a mechanism for userspace to trigger a sync object
directly. There are other ways that userspace can trigger a syncobj
such as submitting a dummy batch somewhere or hanging on to a triggered
sync_file and doing an import. This just provides an easy way to
manually trigger the sync object without weird hacks.
The motivation for this IOCTL is Vulkan fences. Vulkan lets you create
a fence already in the signaled state so that you can wait on it
immediatly without stalling. We could also handle this with a new
create flag to ask the driver to create a syncobj that is already
signaled but the IOCTL seemed a bit cleaner and more generic.
v2:
- Take an array of sync objects (Dave Airlie)
v3:
- Throw -EINVAL if pad != 0
Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/drm_ioctl.c')
| -rw-r--r-- | drivers/gpu/drm/drm_ioctl.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_ioctl.c b/drivers/gpu/drm/drm_ioctl.c index 16c5d51a43aa..a9ae6dd2d593 100644 --- a/drivers/gpu/drm/drm_ioctl.c +++ b/drivers/gpu/drm/drm_ioctl.c @@ -661,6 +661,8 @@ static const struct drm_ioctl_desc drm_ioctls[] = { DRM_UNLOCKED|DRM_RENDER_ALLOW), DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_RESET, drm_syncobj_reset_ioctl, DRM_UNLOCKED|DRM_RENDER_ALLOW), + DRM_IOCTL_DEF(DRM_IOCTL_SYNCOBJ_SIGNAL, drm_syncobj_signal_ioctl, + DRM_UNLOCKED|DRM_RENDER_ALLOW), }; #define DRM_CORE_IOCTL_COUNT ARRAY_SIZE( drm_ioctls ) |