linux-kernel - Re: [PATCH] pci: show dma

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Date:	Wed, 22 Oct 2008 21:19:50 -0700
From:	"Yinghai Lu" <yinghai@...nel.org>
To:	"Matthew Wilcox" <matthew@....cx>
Cc:	"Grant Grundler" <grundler@...isc-linux.org>,
	"Jesse Barnes" <jbarnes@...tuousgeek.org>,
	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH] pci: show dma_mask bits in /sys

On Wed, Oct 22, 2008 at 8:28 PM, Matthew Wilcox <matthew@....cx> wrote:
> On Wed, Oct 22, 2008 at 06:45:10PM -0700, Yinghai Lu wrote:
>> Grant prefer to add it /sys instead of showing in bootlog
>>
>> so could catch if the driver set the correct dma_mask.
>
> I still don't think this is useful information to be exposing.
>

RHEL 4.6 driver sata_mv is very run out of gart IOMMU, and need iommu
apterture to be 512M...
when loading is high, and it turns out every those card support 64bit
DMA, the driver DID NOT set dma to 64bit
so it still use 32 bit...

YH
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