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

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Date:	Fri, 10 Oct 2008 08:48:08 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	grundler@...isc-linux.org, yinghai@...nel.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 Thursday, October 9, 2008 7:40 pm FUJITA Tomonori wrote:
> On Thu, 9 Oct 2008 15:18:37 -0600
>
> Grant Grundler <grundler@...isc-linux.org> 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?
> >
> > Anyone else agree?
>
> Agreed.
>
> dma_mask and dma_consistent_mask is not useful for the
> majority. Printing them at boot time doesn't make sense for me.
>
> Adding under sysfs and using lspci sounds reasonable if we really need
> these information.

Another option would be to add a 'warn_dma_mask=0xxxxxxxxx' boot option that 
would trigger in the actual DMA mask setting routines.  It would let you 
choose the mask you'd like to see warnings about.  Yinghai?

-- 
Jesse Barnes, Intel Open Source Technology Center
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