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196b2b95fe
Add kernel-side support for using the zcull hardware in nvidia gpus. zcull aims to improve memory bandwidth by using an early approximate depth test, similar to hierarchical Z on an AMD card. Add a new ioctl that exposes zcull information that has been read from the hardware. Userspace uses each of these parameters either in a heuristic for determining zcull region parameters or in the calculation of a buffer size. It appears the hardware hasn't changed its structure for these values since FERMI_C (circa 2011), so the assumption is that it won't change on us too quickly, and is therefore reasonable to include in UAPI. This bypasses the nvif layer and instead accesses nvkm_gr directly, which mirrors existing usage of nvkm_gr_units(). There is no nvif object for nvkm_gr yet, and adding one is not trivial. Signed-off-by: Mel Henning <mhenning@darkrefraction.com> Link: https://patch.msgid.link/20260219-zcull3-v3-2-dbe6a716f104@darkrefraction.com Signed-off-by: Danilo Krummrich <dakr@kernel.org> |
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