From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: linux@arm.linux.org.uk, khc@pm.waw.pl,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: ARM: 2.6.3[45] PCI regression (IXP4xx and PXA?)
Date: Thu, 19 Aug 2010 20:31:22 +1000 [thread overview]
Message-ID: <1282213882.22370.360.camel@pasglop> (raw)
In-Reply-To: <20100814181306U.fujita.tomonori@lab.ntt.co.jp>
On Sat, 2010-08-14 at 18:30 +0900, FUJITA Tomonori wrote:
>
> A long solution would be having two dma_mask for a device and a
> bus. We also need something to represent a DMA-capable range instead
> of the dma mask.
I'd rather have the arch (aka the bus) be able to filter the mask,
better than having to deal with multiple masks in the generic code.
Besides, in embedded-land, you never know how many busses are stacked
before you reach the device, ie, you'd end up having to AND quite a few
masks before getting there in some cases.
Sounds better to establish that once, at set_coherent_dma_mask() time.
Cheers,
Ben.
next prev parent reply other threads:[~2010-08-19 10:31 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-10 20:36 ARM: 2.6.3[45] PCI regression (IXP4xx and PXA?) Krzysztof Halasa
2010-08-11 2:06 ` FUJITA Tomonori
2010-08-11 7:25 ` Russell King - ARM Linux
2010-08-13 6:23 ` FUJITA Tomonori
2010-08-13 21:54 ` Russell King - ARM Linux
2010-08-14 9:30 ` FUJITA Tomonori
2010-08-14 18:46 ` Russell King - ARM Linux
2010-08-15 5:42 ` FUJITA Tomonori
2010-08-15 8:23 ` Russell King - ARM Linux
2010-08-15 15:55 ` FUJITA Tomonori
2010-08-16 23:29 ` Krzysztof Halasa
2010-08-19 8:51 ` FUJITA Tomonori
2010-08-19 16:56 ` Krzysztof Halasa
2010-08-19 10:31 ` Benjamin Herrenschmidt [this message]
2010-08-19 14:50 ` FUJITA Tomonori
2010-08-19 16:53 ` Krzysztof Halasa
2010-08-19 17:20 ` FUJITA Tomonori
2010-08-19 21:54 ` Benjamin Herrenschmidt
2010-08-19 21:51 ` Benjamin Herrenschmidt
2010-08-26 11:55 ` FUJITA Tomonori
2010-08-26 13:54 ` FUJITA Tomonori
2010-08-26 17:57 ` Russell King - ARM Linux
2010-08-27 6:54 ` FUJITA Tomonori
2010-08-26 16:02 ` Krzysztof Halasa
2010-08-27 0:26 ` FUJITA Tomonori
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