linux-kernel - Re: Kernel and ADM hardware roulette ( was AMD graphics performance regression in 4.15 and later )

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Message-ID: <1c8b3938-6656-5d5a-f65d-dfd2e55d989e@amd.com>
Date:   Fri, 8 Jun 2018 08:52:52 +0200
From:   Christian König <christian.koenig@....com>
To:     Christoph Hellwig <hch@....de>, Gabriel C <nix.or.die@...il.com>
Cc:     Tom Lendacky <thomas.lendacky@....com>,
        Jean-Marc Valin <jmvalin@...illa.com>,
        Dave Airlie <airlied@...ux.ie>,
        Felix Kuehling <Felix.Kuehling@....com>,
        LKML <linux-kernel@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org,
        Christian König <christian.koenig@....com>,
        Joerg Roedel <jroedel@...e.de>, alexander.deucher@....com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Michel Dänzer <michel@...nzer.net>
Subject: Re: Kernel and ADM hardware roulette ( was AMD graphics performance
 regression in 4.15 and later )

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.