-------- Original-Nachricht --------
Datum: Thu, 29 Jun 2006 11:27:15 +0200
Von: Takashi Iwai [off-list ref]
An: Gerhard Pircher [off-list ref]
Betreff: Re: [Alsa-devel] RFC: dma_mmap_coherent() for powerpc/ppc architecture and ALSA?

At Wed, 28 Jun 2006 22:27:53 +0200,
Gerhard Pircher wrote:

quoted

Hi,

It took a little bit longer to integrate the patch, as I didn't figure

out  first how to implement the __dma_mmap_coherent() function for PPC
systems with CONFIG_NOT_COHERENT_CACHE defined. :)

quoted

Unfortunately my system still crashes within snd_pcm_mmap_data_nopage() 
(sound/core/pcm_native.c), as you can see below. I guess it tries to

remap 

quoted

a DMA buffer allocated by the not cache coherent DMA memory allocation 
function in arch/ppc/kernel/dma-mapping.c.

Strange, nopage will be never called if you apply my patch and modify
to use dma_mmap_coherent().


Takashi

That's indeed strange! I'm sure that the new code is called by the sound drivers. Should snd_pcm_mmap_data_nopage() not be used at all anymore, or are there any cases that could still trigger a call of snd_pcm_mmap_data_nopage()?

Gerhard

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