[PATCH 1/1] drm/amdgpu: Fix compute VM BO params after rebase v2

[PATCH 1/1] drm/amdgpu: Fix compute VM BO params after rebase v2

[Felix Kuehling]

The intent of two commits was lost in the last rebase:

810955b drm/amdgpu: Fix acquiring VM on large-BAR systems
b5d21aa drm/amdgpu: Don't use shadow BO for compute context

This commit restores the original behaviour:
* Don't set AMDGPU_GEM_CREATE_NO_CPU_ACCESS for page directories
  to allow them to be reused for compute VMs
* Don't create shadow BOs for page tables in compute VMs

v2: move more logic into amdgpu_vm_bo_param

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index ea5e277..1d7e3c1 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -595,9 +595,8 @@ static void amdgpu_vm_bo_param(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 		AMDGPU_GEM_CREATE_CPU_GTT_USWC;
 	if (vm->use_cpu_for_update)
 		bp->flags |= AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
-	else
-		bp->flags |= AMDGPU_GEM_CREATE_SHADOW |
-			AMDGPU_GEM_CREATE_NO_CPU_ACCESS;
+	else if (!vm->root.base.bo || vm->root.base.bo->shadow)
+		bp->flags |= AMDGPU_GEM_CREATE_SHADOW;
 	bp->type = ttm_bo_type_kernel;
 	if (vm->root.base.bo)
 		bp->resv = vm->root.base.bo->tbo.resv;
@@ -2749,6 +2748,8 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 	vm->last_update = NULL;
 
 	amdgpu_vm_bo_param(adev, vm, adev->vm_manager.root_level, &bp);
+	if (vm_context == AMDGPU_VM_CONTEXT_COMPUTE)
+		bp.flags &= ~AMDGPU_GEM_CREATE_SHADOW;
 	r = amdgpu_bo_create(adev, &bp, &root);
 	if (r)
 		goto error_free_sched_entity;
-- 
2.7.4

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Re: [PATCH 1/1] drm/amdgpu: Fix compute VM BO params after rebase v2

[Christian König]

Am 06.09.2018 um 16:32 schrieb Felix Kuehling:
> The intent of two commits was lost in the last rebase:
>
> 810955b drm/amdgpu: Fix acquiring VM on large-BAR systems
> b5d21aa drm/amdgpu: Don't use shadow BO for compute context
>
> This commit restores the original behaviour:
> * Don't set AMDGPU_GEM_CREATE_NO_CPU_ACCESS for page directories
>    to allow them to be reused for compute VMs
> * Don't create shadow BOs for page tables in compute VMs
>
> v2: move more logic into amdgpu_vm_bo_param
>
> Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>

Reviewed-by: Christian König <christian.koenig@amd.com>

> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 7 ++++---
>   1 file changed, 4 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index ea5e277..1d7e3c1 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -595,9 +595,8 @@ static void amdgpu_vm_bo_param(struct amdgpu_device *adev, struct amdgpu_vm *vm,
>   		AMDGPU_GEM_CREATE_CPU_GTT_USWC;
>   	if (vm->use_cpu_for_update)
>   		bp->flags |= AMDGPU_GEM_CREATE_CPU_ACCESS_REQUIRED;
> -	else
> -		bp->flags |= AMDGPU_GEM_CREATE_SHADOW |
> -			AMDGPU_GEM_CREATE_NO_CPU_ACCESS;
> +	else if (!vm->root.base.bo || vm->root.base.bo->shadow)
> +		bp->flags |= AMDGPU_GEM_CREATE_SHADOW;
>   	bp->type = ttm_bo_type_kernel;
>   	if (vm->root.base.bo)
>   		bp->resv = vm->root.base.bo->tbo.resv;
> @@ -2749,6 +2748,8 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
>   	vm->last_update = NULL;
>   
>   	amdgpu_vm_bo_param(adev, vm, adev->vm_manager.root_level, &bp);
> +	if (vm_context == AMDGPU_VM_CONTEXT_COMPUTE)
> +		bp.flags &= ~AMDGPU_GEM_CREATE_SHADOW;
>   	r = amdgpu_bo_create(adev, &bp, &root);
>   	if (r)
>   		goto error_free_sched_entity;

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