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@xxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 3 ++-
drivers/gpu/drm/amd/amdkfd/kfd_svm.c | 3 ++-
2 files changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 941a204d28f5..93ee569f6a63 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -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;
}
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
index b11f2b364bbf..a1b1981084fa 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
@@ -1034,7 +1034,8 @@ 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;
}
--
2.31.1
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