Re: [PATCH] drm/amdgpu: Revert "kmap PDs/PTs in amdgpu_vm_update_directories"

["Zhang, Jerry (Junwei)" <Jerry.Zhang-5C7GfCeVMHo@public.gmane.org>]

On 08/30/2018 03:50 PM, Christian König wrote:
> This reverts commit a7f91061c60ad9cac2e6a03b642be6a4f88b3662.
>
> Felix pointed out that we need to have the BOs mapped even before
> amdgpu_vm_update_directories is called.
>
> Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Junwei Zhang <Jerry.Zhang@amd.com>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 13 ++++---------
>   1 file changed, 4 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index 33d9ce229f4a..72f8c750e128 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -343,7 +343,10 @@ int amdgpu_vm_validate_pt_bos(struct amdgpu_device *adev, struct amdgpu_vm *vm,
>   			list_move(&bo_base->vm_status, &vm->moved);
>   			spin_unlock(&vm->moved_lock);
>   		} else {
> -			r = amdgpu_ttm_alloc_gart(&bo->tbo);
> +			if (vm->use_cpu_for_update)
> +				r = amdgpu_bo_kmap(bo, NULL);
> +			else
> +				r = amdgpu_ttm_alloc_gart(&bo->tbo);
>   			if (r)
>   				break;
>   			list_move(&bo_base->vm_status, &vm->relocated);
> @@ -1093,14 +1096,6 @@ int amdgpu_vm_update_directories(struct amdgpu_device *adev,
>   	params.adev = adev;
>
>   	if (vm->use_cpu_for_update) {
> -		struct amdgpu_vm_bo_base *bo_base;
> -
> -		list_for_each_entry(bo_base, &vm->relocated, vm_status) {
> -			r = amdgpu_bo_kmap(bo_base->bo, NULL);
> -			if (unlikely(r))
> -				return r;
> -		}
> -
>   		r = amdgpu_vm_wait_pd(adev, vm, AMDGPU_FENCE_OWNER_VM);
>   		if (unlikely(r))
>   			return r;
>
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