[alsa-devel] Can I mmap buffer allocated using SNDRV_DMA_TYPE_CONTINUOUS?
tiwai at suse.de
Thu Jul 12 15:46:22 CEST 2007
At Wed, 11 Jul 2007 18:17:49 +0530,
Pharaoh . wrote:
> On 7/11/07, Pharaoh . <pharaoh137 at gmail.com> wrote:
> > Hi,
> > I have allocated the DMA buffer using snd_pcm_lib_malloc_pages() and
> > it was preallocated as:
> > snd_pcm_lib_preallocate_pages_for_all(pcm,
> > SNDRV_DMA_TYPE_CONTINUOUS,
> > snd_dma_continuous_data
> > (GFP_KERNEL),
> > 128 * 1024, 128 * 1024);
> > Can I mmap such a dma buffer? I think yes...
> > -pharaoh.
> I dont think it can be mmapped.
It can be basically, but not on all architectures.
For example, ARM has a problem with coherency.
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