linux-kernel - Re: mmap() implementation for pci_alloc

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Message-ID: <4DDA1B18.3080201@ladisch.de>
Date:	Mon, 23 May 2011 10:30:16 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Leon Woestenberg <leon.woestenberg@...il.com>
CC:	Takashi Iwai <tiwai@...e.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-pci@...r.kernel.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: mmap() implementation for pci_alloc_consistent() memory?

Leon Woestenberg wrote:
> Having dma_mmap_coherent() there is good for one or two archs, but how
> can we built portable drivers if the others arch's are still missing?

Easy: Resolve all issues, implement it for all the other arches, and add
it to the official DMA API.

> How would dma_mmap_coherent() look like on x86?

X86 and some others are always coherent; just use vm_insert_page() or
remap_page_range().


Regards,
Clemens
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