From: jamie@jamieiles.com (Jamie Iles)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/2] ARM: use cached memory in dma_alloc_coherent() if possible
Date: Tue, 21 Dec 2010 10:34:27 +0000 [thread overview]
Message-ID: <20101221103427.GC2822@pulham.picochip.com> (raw)
In-Reply-To: <20101221103057.GK28157@n2100.arm.linux.org.uk>
On Tue, Dec 21, 2010 at 10:30:57AM +0000, Russell King - ARM Linux wrote:
> On Tue, Dec 21, 2010 at 10:20:02AM +0000, Jamie Iles wrote:
> > For fully coherent architectures or systems using the ARM ACP to provide
> > coherency to individual device, use cached memory as the coherent
> > backing rather than noncached or simply bufferable memory.
>
> As has already been covered by Catalin, as far as we know, no one uses
> the ACP yet. Do you have a system which does?
No, not yet. I was looking at this to see what the impact would be if we did
though with regards to the CPU side of things for future devices and thought
someone else may find it useful.
Jamie
next prev parent reply other threads:[~2010-12-21 10:34 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-21 10:20 [PATCH 1/2] ARM: convert dma-mapping to asm-generic API Jamie Iles
2010-12-21 10:20 ` [PATCH 2/2] ARM: use cached memory in dma_alloc_coherent() if possible Jamie Iles
2010-12-21 10:30 ` Russell King - ARM Linux
2010-12-21 10:34 ` Jamie Iles [this message]
2010-12-21 11:11 ` Catalin Marinas
2010-12-21 11:22 ` Jamie Iles
2010-12-21 10:36 ` [PATCH 1/2] ARM: convert dma-mapping to asm-generic API Russell King - ARM Linux
2010-12-21 11:01 ` Jamie Iles
2010-12-21 16:04 ` Jamie Iles
2010-12-22 2:57 ` FUJITA Tomonori
2010-12-21 10:54 ` Arnd Bergmann
2010-12-21 10:59 ` Russell King - ARM Linux
2010-12-21 11:53 ` Arnd Bergmann
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