Ian Romanick wrote:
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Keith Whitwell wrote:
- functionality required by libdrm is made available as
device-independent ioctls
When I was originally spec'ing a bunch of this stuff out, it was my
intention to add a couple device-independent ioctls to roughly match
NV_fence. My thought was that the easiest way to do it was by adding
two functions in libdrm:
int drmSetFence( int fd, drm_fence_id * fence );
int drmCheckFence( int fd, const drm_fence_id * target_fence,
drm_fence_id * last_fence, int can_block );
drmCheckFence is a combination glTestFenceNV / glFinishFenceNV. The
most recently completed fence is returned in last_fence.
It should be trivial in the kernel to connect the device-independent
ioctls to whatever these existing device-dependent functionality is.
Yes, that seems to be the best approach.
The only wrinkle is that if you're doing fences, it'd be nice to have a
regularly updated completed fence id in the device independent sarea,
which is currently full. So maybe a new shared area is needed.
Keith
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