Re: [PATCH 2/2] drm/amdkfd: heavy-weight flush TLB after unmap

[Christian König <ckoenig.leichtzumerken@xxxxxxxxx>]

Am 13.05.21 um 18:58 schrieb Philip Yang:
> Need do a heavy-weight TLB flush to make sure we have no more dirty data
> in the cache for the unmapped pages.
>
> Add flush_type parameter to amdgpu_amdkfd_flush_gpu_tlb_pasid.

Using a define for the flush type instead of magic numbers would be 
really nice to have here.

Apart from that I'm fine with the patch.

Christian.

> Signed-off-by: Philip Yang <Philip.Yang@xxxxxxx>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c | 4 ++--
>   drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h | 3 ++-
>   drivers/gpu/drm/amd/amdkfd/kfd_process.c   | 2 +-
>   drivers/gpu/drm/amd/amdkfd/kfd_svm.c       | 4 ++--
>   4 files changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
> index 5f6696a3c778..0be9a6695b2e 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c
> @@ -670,10 +670,10 @@ int amdgpu_amdkfd_flush_gpu_tlb_vmid(struct kgd_dev *kgd, uint16_t vmid)
>   	return 0;
>   }
>   
> -int amdgpu_amdkfd_flush_gpu_tlb_pasid(struct kgd_dev *kgd, uint16_t pasid)
> +int amdgpu_amdkfd_flush_gpu_tlb_pasid(struct kgd_dev *kgd, uint16_t pasid,
> +				      uint32_t flush_type)
>   {
>   	struct amdgpu_device *adev = (struct amdgpu_device *)kgd;
> -	const uint32_t flush_type = 0;
>   	bool all_hub = false;
>   
>   	if (adev->family == AMDGPU_FAMILY_AI)
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
> index 313ee49b9f17..e8ce851c6f29 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
> @@ -135,7 +135,8 @@ int amdgpu_amdkfd_submit_ib(struct kgd_dev *kgd, enum kgd_engine_type engine,
>   void amdgpu_amdkfd_set_compute_idle(struct kgd_dev *kgd, bool idle);
>   bool amdgpu_amdkfd_have_atomics_support(struct kgd_dev *kgd);
>   int amdgpu_amdkfd_flush_gpu_tlb_vmid(struct kgd_dev *kgd, uint16_t vmid);
> -int amdgpu_amdkfd_flush_gpu_tlb_pasid(struct kgd_dev *kgd, uint16_t pasid);
> +int amdgpu_amdkfd_flush_gpu_tlb_pasid(struct kgd_dev *kgd, uint16_t pasid,
> +				      uint32_t flush_type);
>   
>   bool amdgpu_amdkfd_is_kfd_vmid(struct amdgpu_device *adev, u32 vmid);
>   
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> index 9d4f527bda7c..1d8a593edd3f 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c
> @@ -1853,7 +1853,7 @@ void kfd_flush_tlb(struct kfd_process_device *pdd)
>   							pdd->qpd.vmid);
>   	} else {
>   		amdgpu_amdkfd_flush_gpu_tlb_pasid(dev->kgd,
> -						pdd->process->pasid);
> +						pdd->process->pasid, 0);
>   	}
>   }
>   
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> index 50da0d1fb9c1..e57a8e405efd 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_svm.c
> @@ -1125,7 +1125,7 @@ svm_range_unmap_from_gpus(struct svm_range *prange, unsigned long start,
>   				break;
>   		}
>   		amdgpu_amdkfd_flush_gpu_tlb_pasid((struct kgd_dev *)adev,
> -						  p->pasid);
> +						  p->pasid, 2);
>   	}
>   
>   	return r;
> @@ -1182,7 +1182,7 @@ svm_range_map_to_gpu(struct amdgpu_device *adev, struct amdgpu_vm *vm,
>   
>   		p = container_of(prange->svms, struct kfd_process, svms);
>   		amdgpu_amdkfd_flush_gpu_tlb_pasid((struct kgd_dev *)adev,
> -						  p->pasid);
> +						  p->pasid, 0);
>   	}
>   out:
>   	prange->mapping.bo_va = NULL;

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