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Imre Deak authored
Due to a coherency issue on BXT A steppings we can't guarantee a coherent view of cached (CPU snooped) GPU mappings, so fail such requests. User space is supposed to fall back to uncached mappings in this case. v2: - limit the WA to A steppings, on later stepping this HW issue is fixed v3: - return error instead of trying to work around the issue in kernel, since that could confuse user space (Chris) Testcast: igt/gem_store_dword_batches_loop/cached-mapping Signed-off-by:
Imre Deak <imre.deak@intel.com> Reviewed-by:
Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by:
Daniel Vetter <daniel.vetter@ffwll.ch>
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