[PATCH] drm/amdgpu: fix addr handling in amdgpu_vm_bo_update_mapping

[StDenis, Tom]

I'm reading through the amdgpu_vm.c to try and see if the patch is correct but I'm not that familiar with the VM side of things.  It seems to boil down to calling params->func() with a new dst value of NULL but that's where I'm stopped at the moment since I don't know what func() is.  Nothing up to that point looks overtly wrong (like trying to use that address as a source for a read/write).


Tom

________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Christian König <deathsimple at vodafone.de>
Sent: Monday, September 26, 2016 09:29
To: Cui, Flora
Cc: Huang, Ray; amd-gfx at lists.freedesktop.org
Subject: Re: [PATCH] drm/amdgpu: fix addr handling in amdgpu_vm_bo_update_mapping

Yeah, that wouldn't really help but just make the problem more unlikely
to happen once more.

Anyway Tom St confirmed that the patch seems to work for the open stack.

Anybody brave enough to throw an rb on this so that I can commit it?

Thanks,
Christian.

Am 26.09.2016 um 11:16 schrieb Flora Cui:
> please ignore this patch. it actually revert the gtt mgr changes.
>
> On Mon, Sep 26, 2016 at 03:19:01PM +0800, Flora Cui wrote:
>> On Sun, Sep 25, 2016 at 11:55:13AM +0200, Christian König wrote:
>>> From: Christian König <christian.koenig at amd.com>
>>>
>>> Otherwise we will look at the wrong place in the IB when GART
>>> mappings are split into smaller updates.
>>>
>>> Signed-off-by: Christian König <christian.koenig at amd.com>
>>> ---
>>>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>>> index 2bb78dc..da31189 100644
>>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>>> @@ -1017,6 +1017,7 @@ static int amdgpu_vm_bo_update_mapping(struct amdgpu_device *adev,
>>>                                                  AMDGPU_GPU_PAGE_SIZE);
>>>                      pte[i] |= flags;
>>>              }
>>> +           addr = 0;
>>>      }
>>>
>>>      r = amdgpu_sync_fence(adev, &job->sync, exclusive);
>>> --
>>> 2.5.0
>>>
>>>
>> IMHO this could fix the vmfault issue.
>>
>> 8<---
>>  From cc7b5618665defd88e2adcd6f735562ecd784298 Mon Sep 17 00:00:00 2001
>> From: Flora Cui <Flora.Cui at amd.com>
>> Date: Mon, 26 Sep 2016 15:14:02 +0800
>> Subject: [PATCH] drm/amdgpu: add ttm_bind in amdgpu_vm_bo_update()
>>
>> Change-Id: If73d5b06e9188e40250ccdfd1a2a659ed1ef52a6
>> Signed-off-by: Flora Cui <Flora.Cui at amd.com>
>> ---
>>   drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>> index 2bb78dc..7f17127 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
>> @@ -1166,6 +1166,8 @@ int amdgpu_vm_bo_update(struct amdgpu_device *adev,
>>                       ttm = container_of(bo_va->bo->tbo.ttm, struct
>>                                          ttm_dma_tt, ttm);
>>                       pages_addr = ttm->dma_address;
>> +                    amdgpu_ttm_bind(&bo_va->bo->tbo, mem);
>> +                    addr = (u64)mem->start << PAGE_SHIFT;
>>                       break;
>>
>>               case TTM_PL_VRAM:
>> --
>> 2.7.4
>>
>>
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