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

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Message-ID: <877i9sx4nk.fsf@basil.nowhere.org>
Date:	Thu, 04 Sep 2008 00:09:51 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Joerg Roedel <joerg.roedel@....com>
Cc:	mingo@...hat.com, tglx@...utronix.de, hpa@...or.com,
	linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	tony.luck@...el.com
Subject: Re: [PATCH] swiotlb: fix dma_alloc_coherent allocation failures with swiotlb

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

-Andi
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