Kernel and ADM hardware roulette ( was AMD graphics performance regression in 4.15 and later )
Christian König
christian.koenig at amd.com
Fri Jun 8 06:52:52 UTC 2018
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.
Regards,
Christian.
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