drm/amdgpu: Add KFD VRAM limit checking
We don't want KFD processes evicting each other over VRAM usage. Therefore prevent overcommitting VRAM among KFD applications with a per-GPU limit. Also leave enough room for page tables on top of the application memory usage. Acked-by: NAlex Deucher <alexander.deucher@amd.com> Signed-off-by: NFelix Kuehling <Felix.Kuehling@amd.com> Reviewed-by: NEric Huang <JinHuiEric.Huang@amd.com> Signed-off-by: NAlex Deucher <alexander.deucher@amd.com>
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