Re: [alsa-devel] Can I mmap buffer allocated using SNDRV_DMA_TYPE_CONTINUOUS?

At Wed, 11 Jul 2007 18:17:49 +0530, Pharaoh . wrote:

On 7/11/07, Pharaoh . pharaoh137@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.

Takashi