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From:   Gabriel C <nix.or.die@gmail.com>
Date:   Fri, 8 Jun 2018 15:32:06 +0200
Message-ID: <CAEJqkggkZynDvV8XxkFfy89x-DX5xDTyubUJ3oXBO6eUjBWBKw@mail.gmail.com>
Subject: Re: Kernel and ADM hardware roulette ( was AMD graphics performance
 regression in 4.15 and later )
To:     =?UTF-8?Q?Christian_K=C3=B6nig?= <christian.koenig@amd.com>
Cc:     Christoph Hellwig <hch@lst.de>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Jean-Marc Valin <jmvalin@mozilla.com>,
        Dave Airlie <airlied@linux.ie>,
        Felix Kuehling <Felix.Kuehling@amd.com>,
        LKML <linux-kernel@vger.kernel.org>,
        dri-devel@lists.freedesktop.org, Joerg Roedel <jroedel@suse.de>,
        alexander.deucher@amd.com,
        Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        =?UTF-8?Q?Michel_D=C3=A4nzer?= <michel@daenzer.net>
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2018-06-08 8:52 GMT+02:00 Christian K=C3=B6nig <christian.koenig@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 allocati=
on,
> 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