linux-kernel - Re: [PATCH] pci: print out DMA mask info

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Date:	Fri, 10 Oct 2008 11:40:51 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	yinghai@...nel.org
Cc:	grundler@...isc-linux.org, jbarnes@...tuousgeek.org, mingo@...e.hu,
	tglx@...utronix.de, hpa@...or.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org
Subject: Re: [PATCH] pci: print out DMA mask info

On Thu, 09 Oct 2008 14:27:33 -0700
Yinghai Lu <yinghai@...nel.org> wrote:

> Grant Grundler wrote:
> > On Wed, Oct 08, 2008 at 04:02:23PM -0700, Yinghai Lu wrote:
> >> so can find out what is DMA mask is used for pci devices in addition to
> >> default setting.
> > 
> > I like the idea. I don't like the additional boot time output.
> > 
> > But I'm thinking this could be an option to lspci.
> > lspci already knows about the /sys tree. Can PCI export the two masks
> > (dma_mask and dma_consistent_mask) and something like "lspci -td"
> > would dump those in a nice way?
> > 
> in boot log, it could link with driver, pci info...
> > 
> >> got:
> >> aacraid 0000:86:00.0: using 32bit DMA mask
> >> aacraid 0000:86:00.0: using 32bit consistent DMA mask
> >> aacraid 0000:86:00.0: using 64bit DMA mask
> >> aacraid 0000:86:00.0: using 64bit consistent DMA mask
> 
> and aacraid do 32bit at first then 64bit...
> 
> so put that in boot message could be useful too.

IIRC, aacraid uses 32bit dma_mask at startup then it executes a
special command to get dma information from the card, and sets proper
dma_mask. So the above message is not wrong for aacraid, I think.
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