linux-kernel - Re: [PATCH] swiotlb: fix dma_alloc_coherent allocation failures with swiotlb

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Message-ID: <20080904083124.GA18288@one.firstfloor.org>
Date:	Thu, 4 Sep 2008 10:31:24 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	andi@...stfloor.org, joerg.roedel@....com, mingo@...hat.com,
	tglx@...utronix.de, hpa@...or.com, linux-kernel@...r.kernel.org,
	iommu@...ts.linux-foundation.org, kamezawa.hiroyu@...fujitsu.com,
	tony.luck@...el.com
Subject: Re: [PATCH] swiotlb: fix dma_alloc_coherent allocation failures with swiotlb

> Even if it's tree, only each IOMMU knows what's the best. That's the
> point of these changes to remove the tricks in arch/x86/pci-dma.c and
> let IOMMUs do what they want.

Duplicating all the code.  Sounds great.
 
> > Also there's usually the problem that not all busses are translated,
> > e.g. Calgary used to do that so for e.g. dev == NULL allocations you had
> > to use  these fallback algorithms anyways.
> 
> dev == NULL isn't a minor thing. It's just using the fallback
> device.

You still have to handle it fully.

-Andi
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