Reviewed-by: xinhui pan <xinhui....@amd.com>

> 2020年2月25日 20:45,Christian König <ckoenig.leichtzumer...@gmail.com> 写道:
> 
> Am 19.02.20 um 16:02 schrieb Christian König:
>> Add update fences to the root PD while mapping BOs.
>> 
>> Otherwise PDs freed during the mapping won't wait for
>> updates to finish and can cause corruptions.
>> 
>> v2: rebased on drm-misc-next
>> 
>> Signed-off-by: Christian König <christian.koe...@amd.com>
>> Fixes: 90b69cdc5f159 drm/amdgpu: stop adding VM updates fences to the resv 
>> obj
> 
> Felix and Xinhui can I get an rb or at least Acked-by for this patch? It is a 
> major problem for testing which needs to get fixed.
> 
> Thanks,
> Christian.
> 
>> ---
>>  drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 14 ++++++++++++--
>>  1 file changed, 12 insertions(+), 2 deletions(-)
>> 
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c 
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>> index d16231d6a790..ef73fa94f357 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>> @@ -588,8 +588,8 @@ void amdgpu_vm_get_pd_bo(struct amdgpu_vm *vm,
>>  {
>>      entry->priority = 0;
>>      entry->tv.bo = &vm->root.base.bo->tbo;
>> -    /* One for TTM and one for the CS job */
>> -    entry->tv.num_shared = 2;
>> +    /* Two for VM updates, one for TTM and one for the CS job */
>> +    entry->tv.num_shared = 4;
>>      entry->user_pages = NULL;
>>      list_add(&entry->tv.head, validated);
>>  }
>> @@ -1591,6 +1591,16 @@ static int amdgpu_vm_bo_update_mapping(struct 
>> amdgpu_device *adev,
>>              goto error_unlock;
>>      }
>>  +   if (flags & AMDGPU_PTE_VALID) {
>> +            struct amdgpu_bo *root = vm->root.base.bo;
>> +
>> +            if (!dma_fence_is_signaled(vm->last_direct))
>> +                    amdgpu_bo_fence(root, vm->last_direct, true);
>> +
>> +            if (!dma_fence_is_signaled(vm->last_delayed))
>> +                    amdgpu_bo_fence(root, vm->last_delayed, true);
>> +    }
>> +
>>      r = vm->update_funcs->prepare(&params, owner, exclusive);
>>      if (r)
>>              goto error_unlock;
> 

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