[PATCH] drm/amdgpu/gmc6: fix DMA mask

[Paul Menzel]

Dear Alex,


On 28.10.21 00:19, Paul Menzel wrote:

> On 27.10.21 20:23, Alex Deucher wrote:
>> On Wed, Oct 27, 2021 at 2:22 PM Alex Deucher 
>> <alexander.deucher at amd.com> wrote:
>>>
>>> The DMA mask on SI parts is 40 bits not 44.  Looks like a copy
>>> paste typo.
>>
>> Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1762
>>
>> Fixed locally.
> 
> As I have no way to reproduce this, as the ring gfx timeout error is 
> logged ten seconds after the IO_PAGE_FAULT, is very likely to be related?
> 
> Hopefully I am going to be able to test this on Friday. Does AMD’s QA 
> team have the cards to test the `iommu.forcedac=1` case? Is that test 
> case going to be added to the “test protocol”?
> 
> Lastly, should a Fixes tag be added, so it’s picked up for the stable 
> series?

Does the value of 44 need to be changed to 40 also five lines below?

-       adev->need_swiotlb = drm_need_swiotlb(44);
+       adev->need_swiotlb = drm_need_swiotlb(40);


Kind regards,

Paul