Commit 2b2339ee authored May 10, 2021 by Felix Kuehling Committed by Alex Deucher May 19, 2021

drm/amdgpu: Albebaran: MTYPE_NC for coarse-grain remote memory



MTYPE UC was used for a specific use case that ended up not being
implemented. Use NC for better performance for coarse-grained memory where
cache coherence during shader execution is not required.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Oak Zeng <Oak.Zeng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

parent 0c6f7777

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -453,7 +453,8 @@ static uint64_t get_pte_flags(struct amdgpu_device adev, struct kgd_mem mem)
		if (adev->gmc.xgmi.connected_to_cpu)
		snoop = true;
		} else {
		mapping_flags \|= AMDGPU_VM_MTYPE_UC;
		mapping_flags \|= coherent ?
		AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC;
		if (amdgpu_xgmi_same_hive(adev, bo_adev))
		snoop = true;
		}

drivers/gpu/drm/amd/amdkfd/kfd_svm.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -1040,7 +1040,8 @@ svm_range_get_pte_flags(struct amdgpu_device adev, struct svm_range prange)
		if (adev->gmc.xgmi.connected_to_cpu)
		snoop = true;
		} else {
		mapping_flags \|= AMDGPU_VM_MTYPE_UC;
		mapping_flags \|= coherent ?
		AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC;
		if (amdgpu_xgmi_same_hive(adev, bo_adev))
		snoop = true;
		}