ALSA: pcm - Call pgprot_noncached() for vmalloc'ed buffers

pgprot_noncached() can be set for vmalloc'ed buffers safely, and we'd
need non-cached behavior more or less, even for the intermediate ring-
buffers.

Now snd_pcm_lib_mmap_vmalloc() is added as the common PCM mmap callback
that is coupled with snd_pcm_lib_alloc_vmalloc_buffer() & co.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai
2010-01-18 14:58:57 +01:00
parent 3e879d7bac
commit c32d977b81
7 changed files with 23 additions and 0 deletions

View File

@ -1021,6 +1021,10 @@ int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_s
#define snd_pcm_lib_mmap_iomem NULL
#endif
int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
struct vm_area_struct *area);
#define snd_pcm_lib_mmap_vmalloc snd_pcm_lib_mmap_noncached
static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
{
*max = dma < 4 ? 64 * 1024 : 128 * 1024;