Re: [PATCH 2/6] Introduce CONFIG_ZONE_DMA
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- To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
- Subject: Re: [PATCH 2/6] Introduce CONFIG_ZONE_DMA
- From: James Bottomley <James.Bottomley@xxxxxxxxxxxx>
- Date: Mon, 18 Sep 2006 09:58:05 -0500
- Cc: Christoph Lameter <clameter@xxxxxxx>, linux-mm@xxxxxxxxxxxxxxx, Nick Piggin <nickpiggin@xxxxxxxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, Marcelo Tosatti <marcelo@xxxxxxxxx>, Arjan van de Ven <arjan@xxxxxxxxxxxxx>, Martin Bligh <mbligh@xxxxxxxxxx>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>, Andi Kleen <ak@xxxxxxx>, linux-arch@xxxxxxxxxxxxxxx
- In-reply-to: <20060918135559.GB15096@xxxxxxxxxxxxx>
- References: <20060911222729.4849.69497.sendpatchset@xxxxxxxxxxxxxxxxxxxxxxxxx> <20060911222739.4849.79915.sendpatchset@xxxxxxxxxxxxxxxxxxxxxxxxx> <20060918135559.GB15096@xxxxxxxxxxxxx>
On Mon, 2006-09-18 at 14:55 +0100, Christoph Hellwig wrote:
> Let's pass this on to linux-arch so that the arch maintainers can give input
> whether they need ZONE_DMA or not. If this just sneaks in unseen I'd bet
> various architectures will just keept it around despite not needing it.
Right at the moment, parisc has no use for ZONE_DMA. We basically set
ZONE_DMA == ZONE_NORMAL. I don't believe our 32 bit systems will ever
need it. On the 64 bit systems currently we insist on having an IOMMU
for every transaction, so ZONE_DMA == ZONE_NORMAL still. However, on
the zx1 systems, I can see us eventually implementing IOMMU bypass and
for that case, we might need ZONE_DMA (primarily for GFP_DMA32, I
suppose, which we could do internally).
James
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