[alsa-devel] Non-cacheable memory to alsa ring buffer

Hi

How can I allocate non-cacheable region for ring buffer?

I have an issue, where my DMA is not fetching right data from Memory. I suspect that caching might be issue here.

I am using the below api to allocate memory:

retval = snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_CONTINUOUS, snd_dma_continuous_data(GFP_KERNEL), RING_MIN_BUFFER, RING_MAX_BUFFER);

Where, RING_MIN_BUFFER = RING_MAX_BUFFER = (8*1024)

Thanks Ramesh