Kernel and ADM hardware roulette ( was AMD graphics performance regression in 4.15 and later )

[Gabriel C]

2018-06-08 8:52 GMT+02:00 Christian König <christian.koenig at amd.com>:
> Am 08.06.2018 um 08:02 schrieb Christoph Hellwig:
>>
>> On Thu, Jun 07, 2018 at 02:32:46PM +0200, Gabriel C wrote:
>>>
>>> Ok done.. bisect points to:
>>
>> What is the failure mode you are seeing?  Can't find anything in the
>> mail unfortunately.
>
>
> As far as I analyzed it we now get an -ENOMEM from dma_alloc_attrs() in
> drivers/gpu/drm/ttm/ttm_page_alloc_dma.c when IOMMU is enabled.
>
> Still need to figure out which parameters we want to use for the allocation,
> but I think it is only 4k or 8k.

When you guys need me to test something , or run debug patches
or patches of any sort just let me know..

>
> Regards,
> Christian.

BR