linux-kernel - Re: [PATCH 0/10] DMA-API debugging facility

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Date:	Fri, 21 Nov 2008 18:03:21 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>, netdev@...r.kernel.org,
	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/10] DMA-API debugging facility


* Joerg Roedel <joerg.roedel@....com> wrote:

> On Fri, Nov 21, 2008 at 04:54:52PM +0000, David Woodhouse wrote:
> > On Fri, 2008-11-21 at 17:26 +0100, Joerg Roedel wrote:
> > > this patchset introduces code to debug drivers usage of the DMA-API.
> > > Tests with hardware IOMMUs have shown several bugs in drivers
> > > regarding the usage of that API.
> > > Problems were found especially in network card drivers.
> > 
> > This is really useful -- but surely it shouldn't be x86-specific?
> > 
> > All the code except the hooks in the architecture's dma_map_single() et
> > al functions could be generic, couldn't it?
> 
> Yes, in principle we could move most of it to generic code. There is 
> nothing architecture specific in it. Anybody who prefers this to be 
> arch/x86 before moving it to lib/?

yeah, we want to make it generic once it works.

but my comments about the allocation needs to be addressed (see my 
comments on [03/10]), and solving that will likely impact the 
structure of the approach in a way that will generalize it anyway, as 
a side-effect.

	Ingo
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