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Commit c32d977b authored by Takashi Iwai's avatar Takashi Iwai
Browse files

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: default avatarTakashi Iwai <tiwai@suse.de>
parent 3e879d7b

include/sound/pcm.h

+4 −0
Original line number Diff line number Diff line
@@ -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;

sound/core/pcm_native.c

+9 −0
Original line number Diff line number Diff line
@@ -3176,6 +3176,15 @@ int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, 
EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);

#endif /* SNDRV_PCM_INFO_MMAP */



/* mmap callback with pgprot_noncached */

int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,

			       struct vm_area_struct *area)

{

	area->vm_page_prot = pgprot_noncached(area->vm_page_prot);

	return snd_pcm_default_mmap(substream, area);

}

EXPORT_SYMBOL(snd_pcm_lib_mmap_noncached);



/*

 * mmap DMA buffer

 */

sound/drivers/vx/vx_pcm.c

+2 −0
Original line number Diff line number Diff line
@@ -905,6 +905,7 @@ static struct snd_pcm_ops vx_pcm_playback_ops = { 
	.trigger =	vx_pcm_trigger,

	.pointer =	vx_pcm_playback_pointer,

	.page =		snd_pcm_lib_get_vmalloc_page,

	.mmap =		snd_pcm_lib_mmap_vmalloc,

};
@@ -1125,6 +1126,7 @@ static struct snd_pcm_ops vx_pcm_capture_ops = { 
	.trigger =	vx_pcm_trigger,

	.pointer =	vx_pcm_capture_pointer,

	.page =		snd_pcm_lib_get_vmalloc_page,

	.mmap =		snd_pcm_lib_mmap_vmalloc,

};

sound/mips/sgio2audio.c

+3 −0
Original line number Diff line number Diff line
@@ -691,6 +691,7 @@ static struct snd_pcm_ops snd_sgio2audio_playback1_ops = { 
	.trigger =     snd_sgio2audio_pcm_trigger,

	.pointer =     snd_sgio2audio_pcm_pointer,

	.page =        snd_pcm_lib_get_vmalloc_page,

	.mmap =        snd_pcm_lib_mmap_vmalloc,

};



static struct snd_pcm_ops snd_sgio2audio_playback2_ops = {
@@ -703,6 +704,7 @@ static struct snd_pcm_ops snd_sgio2audio_playback2_ops = { 
	.trigger =     snd_sgio2audio_pcm_trigger,

	.pointer =     snd_sgio2audio_pcm_pointer,

	.page =        snd_pcm_lib_get_vmalloc_page,

	.mmap =        snd_pcm_lib_mmap_vmalloc,

};



static struct snd_pcm_ops snd_sgio2audio_capture_ops = {
@@ -715,6 +717,7 @@ static struct snd_pcm_ops snd_sgio2audio_capture_ops = { 
	.trigger =     snd_sgio2audio_pcm_trigger,

	.pointer =     snd_sgio2audio_pcm_pointer,

	.page =        snd_pcm_lib_get_vmalloc_page,

	.mmap =        snd_pcm_lib_mmap_vmalloc,

};



/*

sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c

+1 −0
Original line number Diff line number Diff line
@@ -277,6 +277,7 @@ static struct snd_pcm_ops pdacf_pcm_capture_ops = { 
	.trigger =	pdacf_pcm_trigger,

	.pointer =	pdacf_pcm_capture_pointer,

	.page =		snd_pcm_lib_get_vmalloc_page,

	.mmap =		snd_pcm_lib_mmap_vmalloc,

};