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

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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>
This commit is contained in:
Felix Kuehling 2021-05-10 18:37:56 -04:00 • committed by Alex Deucher
parent 195c41fba4
commit 0c6f7777cf
2 changed files with 4 additions and 2 deletions
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3
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
View file

@ -433,7 +433,8 @@ static uint64_t get_pte_flags(struct amdgpu_device *adev, struct kgd_mem *mem)
mapping_flags |= coherent ?
AMDGPU_VM_MTYPE_CC : AMDGPU_VM_MTYPE_RW;
else
mapping_flags |= AMDGPU_VM_MTYPE_UC;
mapping_flags |= coherent ?
AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC;
} else {
mapping_flags |= coherent ?
AMDGPU_VM_MTYPE_UC : AMDGPU_VM_MTYPE_NC;

3
drivers/gpu/drm/amd/amdkfd/kfd_svm.c
View file

@ -1022,7 +1022,8 @@ svm_range_get_pte_flags(struct amdgpu_device *adev, struct svm_range *prange)
mapping_flags |= coherent ?
AMDGPU_VM_MTYPE_CC : AMDGPU_VM_MTYPE_RW;
} 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;
}