drm/radeon/kms: implement timestamp userspace query (v2)
Returns a snapshot of the GPU clock counter. Needed for certain OpenGL extensions. v2: agd5f - address Jerome's comments - add function documentation Signed-off-by: NMarek Olšák <maraeo@gmail.com> Reviewed-by: NJerome Glisse <jglisse@redhat.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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