linux-kernel - Re: [alsa-devel] [PATCH] ASoC: snd_dmaengine: add common api for pcm

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Date:	Thu, 28 Jun 2012 14:32:33 +0200
From:	Clemens Ladisch <clemens@...isch.de>
To:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
CC:	Takashi Iwai <tiwai@...e.de>, alsa-devel@...a-project.org,
	Lars-Peter Clausen <lars@...afoo.de>, swarren@...dia.com,
	linux-kernel@...r.kernel.org,
	Laxman Dewangan <ldewangan@...dia.com>, lrg@...com
Subject: Re: [alsa-devel] [PATCH] ASoC: snd_dmaengine: add common api for
 pcm_mmap

Mark Brown wrote:
> On Thu, Jun 28, 2012 at 02:15:38PM +0200, Takashi Iwai wrote:
>> So far, only ARM has dma_mmap_writecombine(), thus the build on other
>> arch would fail as is.
>
> Oh, dear - this means we don't actually have a generic API at all.  Is
> there any effort being made to make this generally available?

http://lkml.org/lkml/2012/6/15/27:
| Commit 9adc5374 ('common: dma-mapping: introduce mmap method') added a
| generic method for implementing mmap user call to dma_map_ops structure.
|
| This patch converts ARM and PowerPC architectures (the only providers of
| dma_mmap_coherent/dma_mmap_writecombine calls) to use this generic
| dma_map_ops based call and adds a generic cross architecture
| definition for dma_mmap_attrs, dma_mmap_coherent, dma_mmap_writecombine
| functions.
|
| The generic mmap virt_to_page-based fallback implementation is provided for
| architectures which don't provide their own implementation for mmap method.
|
| Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>
| Reviewed-by: Kyungmin Park <kyungmin.park@...sung.com>
| ---
| Hello,
| This patch is a continuation of my works on dma-mapping cleanup and
| unification. Previous works (commit 58bca4a8fa ('Merge branch
| 'for-linus' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping')
| has been merged to v3.4-rc2. Now I've focuses on providing implementation
| for all architectures so the drivers and some cross-architecture common
| helpers (like for example videobuf2) can start using this new api.
|
| I'm not 100% sure if the PowerPC changes are correct. The cases of
| dma_iommu_ops and vio_dma_mapping_ops are a bit suspicious for me, but I
| have no way to test and check if my changes works for that hardware.
|
| Best regards
| Marek Szyprowski
| Samsung Poland R&D Center

Regards,
Clemens
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