linux-kernel - Re: [PATCH 4/5] radeon/ttm/PCIe: Use dma

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Date:	Fri, 28 Jan 2011 09:42:48 -0500
From:	Jerome Glisse <j.glisse@...il.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Cc:	dri-devel@...ts.freedesktop.org, thomas@...pmail.org,
	airlied@...ux.ie, linux-kernel@...r.kernel.org,
	Alex Deucher <alexdeucher@...il.com>,
	Jerome Glisse <jglisse@...hat.com>, konrad@...nok.org
Subject: Re: [PATCH 4/5] radeon/ttm/PCIe: Use dma_addr if TTM has set it.

On Thu, Jan 27, 2011 at 4:20 PM, Konrad Rzeszutek Wilk
<konrad.wilk@...cle.com> wrote:
> On Fri, Jan 07, 2011 at 12:11:43PM -0500, Konrad Rzeszutek Wilk wrote:
>> If the TTM layer has used the DMA API to setup pages that are
>> TTM_PAGE_FLAG_DMA32 (look at patch titled: "ttm: Utilize the dma_addr_t
>> array for pages that are to in DMA32 pool."), lets use it
>> when programming the GART in the PCIe type cards.
>>
>> This patch skips doing the pci_map_page (and pci_unmap_page) if
>> there is a DMA addresses passed in for that page. If the dma_address
>> is zero (or DMA_ERROR_CODE), then we continue on with our old
>> behaviour.
>
> Hey Jerome,
>
> I should have CC-ed you earlier but missed that and instead just
> CC-ed the mailing list. I was wondering what your thoughts are
> about this patchset? Thomas took a look at the patchset and he is OK
> but more eyes never hurt.
>
> FYI, for clarity I hadn't made the old calls that got moved due
> to adding of "{" checkpatch.pl compliant. It complains about it being
> past 80 characters. I can naturally fix that up, but thought
> that it might detract from the nature of the patch.

What happen when we don't ask dma32 alloc to ttm ? Will this still
work in virtualized environnement ?

Code looks good but GART stuff can be picky, i will try to do a full
scale testing in next couple week.

Cheers,
Jerome
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