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

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Message-ID: <48EE7745.2020603@kernel.org>
Date:	Thu, 09 Oct 2008 14:27:33 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Grant Grundler <grundler@...isc-linux.org>
CC:	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: print out DMA mask info

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.

YH
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