linux-kernel - Re: [PATCH] drm/ttm: Make sure BOs being swapped out are cacheable

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Date:   Fri, 27 Jan 2017 15:43:18 +0100
From:   Christian König <christian.koenig@....com>
To:     Thomas Hellstrom <thellstrom@...are.com>,
        Michel Dänzer <michel@...nzer.net>,
        Sinclair Yeh <syeh@...are.com>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/ttm: Make sure BOs being swapped out are cacheable

Am 27.01.2017 um 15:12 schrieb Daniel Vetter:
> On Fri, Jan 27, 2017 at 09:22:47AM +0100, Christian König wrote:
>> Am 27.01.2017 um 08:30 schrieb Daniel Vetter:
>>> On Fri, Jan 27, 2017 at 07:23:58AM +0100, Thomas Hellstrom wrote:
>>>> On 01/27/2017 03:29 AM, Michel Dänzer wrote:
>>>>> On 26/01/17 09:46 AM, Sinclair Yeh wrote:
>>>>>> On Wed, Jan 25, 2017 at 10:49:33AM +0100, Christian König wrote:
>>>>>>> Am 25.01.2017 um 10:25 schrieb Thomas Hellstrom:
>>>>>>>> On 01/25/2017 09:21 AM, Michel Dänzer wrote:
>>>>>>>>> From: Michel Dänzer <michel.daenzer@....com>
>>>>>>>>>
>>>>>>>>> The current caching state may not be tt_cached, even though the
>>>>>>>>> placement contains TTM_PL_FLAG_CACHED, because placement can contain
>>>>>>>>> multiple caching flags. Trying to swap out such a BO would trip up the
>>>>>>>>>
>>>>>>>>> 	BUG_ON(ttm->caching_state != tt_cached);
>>>>>>>>>
>>>>>>>>> in ttm_tt_swapout.
>>>>>>>>>
>>>>>>>>> Cc: stable@...r.kernel.org
>>>>>>>>> Signed-off-by: Michel Dänzer <michel.daenzer@....com>
>>>>>>>> Reviewed-by: Thomas Hellstrom <thellstrom@...are.com>
>>>>>>> Reviewed-by: Christian König <christian.koenig@....com>.
>>>>>> Reviewed-by: Sinclair Yeh <syeh@...are.com>
>>>>> Thanks for the reviews! Via which tree should we merge this?
>>>>>
>>>>>
>>>> I don't maintain a TTM tree any longer. Let's check with Daniel if he
>>>> can merge it through drm-misc.
>>> I'm trying very hard not to get volunteered for ttm maintainer :-)
>> Yeah, ok I volunteer. Wanted to take that over for a while anyway.
> I guess you didn't use the dim magic to push it? The test integration tree
> isn't rebuild ... Quickstart for the tooling:

Autsch! Do I have to use that or can I just go with my usual tool set?

Would probably be a pain to set this up everywhere here.

Christian.

>
> https://01.org/linuxgraphics/gfx-docs/maintainer-tools/dim.html
>
> -Daniel