[PATCH 4/9] drm/amdgpu: add bo_va cleared flag again

[zhoucm1]

I'm not sure this one, since you remove status lock for vm_status list, 
I think we need to test this carefully.

Regards,

David Zhou


On 2017年08月25日 17:38, Christian König wrote:
> From: Christian König <christian.koenig at amd.com>
>
> We changed this to use an extra list a while back, but for the next
> series I need a separate flag again.
>
> Signed-off-by: Christian König <christian.koenig at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_object.h |  3 +++
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c     | 37 ++++++++++++++----------------
>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h     |  3 ---
>   3 files changed, 20 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
> index a288fa6..e613ba4 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
> @@ -55,6 +55,9 @@ struct amdgpu_bo_va {
>   	/* mappings for this bo_va */
>   	struct list_head		invalids;
>   	struct list_head		valids;
> +
> +	/* If the mappings are cleared or filled */
> +	bool				cleared;
>   };
>   
>   struct amdgpu_bo {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> index f621dba..16148ef 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
> @@ -1787,10 +1787,13 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
>   	else
>   		flags = 0x0;
>   
> -	spin_lock(&vm->status_lock);
> -	if (!list_empty(&bo_va->base.vm_status))
> +	/* We access vm_status without the status lock here, but that is ok
> +	 * because when we don't clear the BO is locked and so the status can't
> +	 * change
> +	 */
> +	if ((!clear && !list_empty(&bo_va->base.vm_status)) ||
> +	    bo_va->cleared != clear)
>   		list_splice_init(&bo_va->valids, &bo_va->invalids);
> -	spin_unlock(&vm->status_lock);
>   
>   	list_for_each_entry(mapping, &bo_va->invalids, list) {
>   		r = amdgpu_vm_bo_split_mapping(adev, exclusive, pages_addr, vm,
> @@ -1800,25 +1803,22 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
>   			return r;
>   	}
>   
> -	if (trace_amdgpu_vm_bo_mapping_enabled()) {
> -		list_for_each_entry(mapping, &bo_va->valids, list)
> -			trace_amdgpu_vm_bo_mapping(mapping);
> -
> -		list_for_each_entry(mapping, &bo_va->invalids, list)
> -			trace_amdgpu_vm_bo_mapping(mapping);
> +	if (vm->use_cpu_for_update) {
> +		/* Flush HDP */
> +		mb();
> +		amdgpu_gart_flush_gpu_tlb(adev, 0);
>   	}
>   
>   	spin_lock(&vm->status_lock);
> -	list_splice_init(&bo_va->invalids, &bo_va->valids);
>   	list_del_init(&bo_va->base.vm_status);
> -	if (clear)
> -		list_add(&bo_va->base.vm_status, &vm->cleared);
>   	spin_unlock(&vm->status_lock);
>   
> -	if (vm->use_cpu_for_update) {
> -		/* Flush HDP */
> -		mb();
> -		amdgpu_gart_flush_gpu_tlb(adev, 0);
> +	list_splice_init(&bo_va->invalids, &bo_va->valids);
> +	bo_va->cleared = clear;
> +
> +	if (trace_amdgpu_vm_bo_mapping_enabled()) {
> +		list_for_each_entry(mapping, &bo_va->valids, list)
> +			trace_amdgpu_vm_bo_mapping(mapping);
>   	}
>   
>   	return 0;
> @@ -2419,9 +2419,7 @@ void amdgpu_vm_bo_invalidate(struct amdgpu_device *adev,
>   
>   	list_for_each_entry(bo_base, &bo->va, bo_list) {
>   		spin_lock(&bo_base->vm->status_lock);
> -		if (list_empty(&bo_base->vm_status))
> -			list_add(&bo_base->vm_status,
> -				 &bo_base->vm->moved);
> +		list_move(&bo_base->vm_status, &bo_base->vm->moved);
>   		spin_unlock(&bo_base->vm->status_lock);
>   	}
>   }
> @@ -2508,7 +2506,6 @@ int amdgpu_vm_init(struct amdgpu_device *adev, struct amdgpu_vm *vm,
>   		vm->reserved_vmid[i] = NULL;
>   	spin_lock_init(&vm->status_lock);
>   	INIT_LIST_HEAD(&vm->moved);
> -	INIT_LIST_HEAD(&vm->cleared);
>   	INIT_LIST_HEAD(&vm->freed);
>   
>   	/* create scheduler entity for page table updates */
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> index 9347d28..e705f0f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.h
> @@ -126,9 +126,6 @@ struct amdgpu_vm {
>   	/* BOs moved, but not yet updated in the PT */
>   	struct list_head	moved;
>   
> -	/* BOs cleared in the PT because of a move */
> -	struct list_head	cleared;
> -
>   	/* BO mappings freed, but not yet updated in the PT */
>   	struct list_head	freed;
>