linux-kernel - Re: [PATCH] TTM DMA pool v1.8

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Date:	Mon, 03 Oct 2011 18:56:27 +0200
From:	Thomas Hellstrom <thellstrom@...are.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	bskeggs@...hat.com, j.glisse@...hat.com, thomas@...pmail.org,
	airlied@...hat.com, airlied@...ux.ie, alexdeucher@...il.com,
	xen-devel@...ts.xensource.com
Subject: Re: [PATCH] TTM DMA pool v1.8

On 10/03/2011 06:46 PM, Konrad Rzeszutek Wilk wrote:
>
> It does now (I had a spinlock mishap).. which reminds me - how
> do I test these patches with your vmwgfx driver? I've an old version
> of VMWare Workstation 8, would that do?
>    

VMware workstation 8 is OK (it's actually the latest version of 
workstation).

You'd need the vmwgfx kernel, driver,
latest mesa master compiled with the "svga" driver and the "dri" and 
"xa" state trackers.
xf86-video-vmware, the "vmwgfx" branch.

And you should be fine running 3D.



>>      
>>> The swapping code back (so from swap to pool) does not seem to
>>> distinguish it that much - it just allocates a new page - and
>>> then copies from whatever was in the swap cache?
>>>
>>> This is something you were thinking to do in the future I presume?
>>>        
>> Yes. If / when I do that, I might be adding a new backend function
>> to put a ttm in an
>> "anonymous state", that is using only pages that can be inserted in
>> the swap cache or passed
>> around to other devices, and to put a ttm in a "device" state, that
>> copies it to device mappable pages.
>>      
> OK, that should be no trouble - we would need to expose a function
> call to "detach" the page from the TTM pool (which could mean
> actually allocating a new page for the "other" device, and copying
> it from the "source" to "other" and then freeing the "source).
>
> I am thinking ... you hotplug an high-end radeon while the machine has
> an ATI ES1000 in it, and want to move those pages to the new
> card. The ATI ES1000 can only do up to 4GB, while the new fancy card
> has no such limits (and perhaps does not want to use the TTM DMA
> pool).
>
> Is this what you had in mind?
>    
Yes, that's a typical use-case. Or passing pages between an array of 
GPGPUs...


>> Thanks,
>> /Thomas
>>      

/Thomas

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