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

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Message-Id: <20080904131130E.fujita.tomonori@lab.ntt.co.jp>
Date:	Thu, 4 Sep 2008 13:11:47 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	andi@...stfloor.org
Cc:	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

On Thu, 04 Sep 2008 00:09:51 +0200
Andi Kleen <andi@...stfloor.org> wrote:

> Joerg Roedel <joerg.roedel@....com> writes:
> 
> > The SWIOTLB version of dma_alloc_coherent allocates all memory with
> > GFP_DMA unconditionally. This leads sometimes unnecessary to allocation
> > failures. This patch makes the allocation strategy to use the DMA32 zone
> > first if this is possible. The changes are boot tested on AMD64 and
> > compile tested for i386 and IA64.
> 
> The high level dma_alloc_coherent() does that anyways.

The high level dma_alloc_coherent means the tricks in
arch/x86/pci-dma.c? If so, all the tricks has gone in tip/master.


> The swiotlb fallback really should only allocate from the swiotlb,
> nowhere else.

Agreed.

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