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Re: [Xen-devel] [PATCH 27/44] sparc: remove leon_dma_ops
- To: Christoph Hellwig <hch@xxxxxx>, x86@xxxxxxxxxx, linux-arm-kernel@xxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-c6x-dev@xxxxxxxxxxxxx, linux-hexagon@xxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, linux-mips@xxxxxxxxxxxxxx, openrisc@xxxxxxxxxxxxxxxxxxxx, linuxppc-dev@xxxxxxxxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-sh@xxxxxxxxxxxxxxx, sparclinux@xxxxxxxxxxxxxxx, linux-xtensa@xxxxxxxxxxxxxxxx, dmaengine@xxxxxxxxxxxxxxx, linux-tegra@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-samsung-soc@xxxxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx
- From: Andreas Larsson <andreas@xxxxxxxxxxx>
- Date: Mon, 12 Jun 2017 10:06:26 +0200
- Cc: linux-kernel@xxxxxxxxxxxxxxx
- Delivery-date: Mon, 12 Jun 2017 09:36:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On 2017-06-08 15:25, Christoph Hellwig wrote:
We can just use pci32_dma_ops.
Btw, given that leon is 32-bit and appears to be PCI based, do even need
the special case for it in get_arch_dma_ops at all?
Hi!
Yes, it is needed. LEON systems are AMBA bus based. The common case here
is DMA over AMBA buses. Some LEON systems have PCI bridges, but in
general CONFIG_PCI is not a given.
--
Andreas Larsson
Software Engineer
Cobham Gaisler
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