linux-kernel - Re: pci_map_sg() does not coalesce adjacent physical memory? x86

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Date:	Tue, 18 Nov 2008 10:37:21 +0100
From:	"Leon Woestenberg" <leon.woestenberg@...il.com>
To:	"James Bottomley" <James.Bottomley@...senpartnership.com>
Cc:	"Andrew Morton" <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"FUJITA Tomonori" <fujita.tomonori@....ntt.co.jp>,
	"Tejun Heo" <tj@...nel.org>
Subject: Re: pci_map_sg() does not coalesce adjacent physical memory? x86

Hello all,

On Tue, Nov 18, 2008 at 6:21 AM, James Bottomley
<James.Bottomley@...senpartnership.com> wrote:
> On Mon, 2008-11-17 at 19:15 -0800, Andrew Morton wrote:
>> (cc's added)
>>
>> On Mon, 17 Nov 2008 22:54:33 +0100 "Leon Woestenberg" <leon.woestenberg@...il.com> wrote:
>> > pci_map_sg() does not coalesce the scattergather list for me on x86.
>> In which kernel version(s)?
>
2.6.24 for x86, and 2.6.27 for powerpc. Sorry, this is a bogus report:

I tried to isolate the scattergather implementation, thereby the dev
pointer got NULL, which results in different dma_ops.

I am bringing a freshly written driver upstream 'altpciechdma' for the
Altera FPGA PCI Express Chaining DMA reference design. Will probably
appear in staging RSN.

Thanks for the help,
-- 
Leon
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