From: Andi Kleen <andi@firstfloor.org>
To: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: andi@firstfloor.org, joerg.roedel@amd.com, mingo@redhat.com,
tglx@linutronix.de, hpa@zytor.com, linux-kernel@vger.kernel.org,
iommu@lists.linux-foundation.org, kamezawa.hiroyu@jp.fujitsu.com,
tony.luck@intel.com
Subject: Re: [PATCH] swiotlb: fix dma_alloc_coherent allocation failures with swiotlb
Date: Thu, 4 Sep 2008 10:31:24 +0200 [thread overview]
Message-ID: <20080904083124.GA18288@one.firstfloor.org> (raw)
In-Reply-To: <20080904171903M.fujita.tomonori@lab.ntt.co.jp>
> 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
next prev parent reply other threads:[~2008-09-04 8:29 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-03 15:03 [PATCH] swiotlb: fix dma_alloc_coherent allocation failures with swiotlb Joerg Roedel
2008-09-03 18:04 ` [PATCH 0/3] fix swiotlb allocation gfp flag FUJITA Tomonori
2008-09-03 18:04 ` [PATCH 1/3] x86: remove the NULL device hack in dma-mapping.h FUJITA Tomonori
2008-09-03 18:04 ` [PATCH 2/3] x86: set gfp flag properly for swiotlb_alloc_coherent FUJITA Tomonori
2008-09-03 18:04 ` [PATCH 3/3] swiotlb: use GFP_DMA32 instead of GFP_DMA in swiotlb_alloc_coherent FUJITA Tomonori
2008-09-03 20:05 ` Joerg Roedel
2008-09-04 4:11 ` FUJITA Tomonori
2008-09-03 18:54 ` [PATCH 1/3] x86: remove the NULL device hack in dma-mapping.h FUJITA Tomonori
2008-09-03 20:01 ` Joerg Roedel
2008-09-04 4:11 ` FUJITA Tomonori
2008-09-04 10:00 ` Joerg Roedel
2008-09-04 12:50 ` FUJITA Tomonori
2008-09-03 18:05 ` [PATCH] swiotlb: fix dma_alloc_coherent allocation failures with swiotlb FUJITA Tomonori
2008-09-03 19:54 ` Joerg Roedel
2008-09-03 20:11 ` Joerg Roedel
2008-09-04 4:11 ` FUJITA Tomonori
2008-09-03 22:09 ` Andi Kleen
2008-09-04 4:11 ` FUJITA Tomonori
2008-09-04 7:44 ` Andi Kleen
2008-09-04 7:58 ` FUJITA Tomonori
2008-09-04 8:05 ` Andi Kleen
2008-09-04 8:18 ` FUJITA Tomonori
2008-09-04 8:31 ` Andi Kleen [this message]
2008-09-04 9:49 ` Joerg Roedel
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