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

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Date:	Sat, 1 Nov 2008 11:10:03 -0600
From:	Grant Grundler <grundler@...isc-linux.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Grant Grundler <grundler@...isc-linux.org>,
	Matthew Wilcox <matthew@....cx>,
	Yinghai Lu <yinghai@...nel.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 Fri, Oct 24, 2008 at 12:50:12PM +0200, Andi Kleen wrote:
> Grant Grundler <grundler@...isc-linux.org> writes:
> 
> > On Wed, Oct 22, 2008 at 09:28:33PM -0600, Matthew Wilcox 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.
> >
> > It's useful for anyone involved with device drivers - we agree that's
> > a very limited subset of users.  I certainly get fed up with trying
> > to figure out which dma_mask each driver is using since in some
> 
> One simple way that doesn't need any kernel changes is to use
> crash on the running kernel.

I would agree if someone can show me how to script crash to dump
all the struct pci_dev DMA masks and associate that output with
a driver and device instance.

> I personally just stuck in printks
> when I needed that, but it doesn't strike me as something that 
> is generally useful in standard kernels (agreeing with Willy)

Ok.

thanks,
grant
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