drm/amdgpu: Add EXT_COHERENT memory allocation flags
These flags (for GEM and SVM allocations) allocate memory that allows for system-scope atomic semantics. On GFX943 these flags cause caches to be avoided on non-local memory. On all other ASICs they are identical in functionality to the equivalent COHERENT flags. Corresponding Thunk patch is at https://github.com/RadeonOpenCompute/ROCT-Thunk-Interface/pull/88 Reviewed-by:David Yat Sin <David.YatSin@amd.com> Signed-off-by:
David Francis <David.Francis@amd.com> Signed-off-by:
Alex Deucher <alexander.deucher@amd.com>
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d92e5556
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