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

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Message-ID: <5e8d77b2-8b71-6542-4ef5-c7a5d16f2455@amd.com>
Date:   Fri, 27 Jan 2017 09:22:47 +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 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.

> Nominally Alex&Christian have drm-misc commit rights, but they haven't
> used them yet. But I think merging through drm-misc would make sense,
> there's regular pull request trains for both -next and -fixes.

Completely agree on merging it through drm-misc. Going to give my push 
rights a try today.

> Or merge through the amd tree with Dave's ack, but I'd really like to get amd folks
> into the drm-misc group ...

I've got a few more already reviewed TTM changes which are currently 
waiting to be pushed upstream where amdgpu has dependencies on.

Going to sync with Alex so he sends his pull requests with those changes 
to Dave after the merge of the depending changes.

If you want to object that just merging through the AMD tree would be 
simpler, I agree but I actually want to do this exercise at least once :)

Regards,
Christian.

> -Daniel