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Commit 18a2b962 authored by Takashi Iwai's avatar Takashi Iwai
Browse files

ALSA: pcm - Export snd_pcm_lib_default_mmap() helper 



Export the default mmap function, snd_pcm_lib_default_mmap().
The upcoming non-snooping support in HD-audio driver will use this
to override the mmap method.

Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent a5973103

include/sound/pcm.h

+2 −0
Original line number Diff line number Diff line
@@ -1035,6 +1035,8 @@ static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area) 
	atomic_dec(&substream->mmap_count);

}



int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,

			     struct vm_area_struct *area);

/* mmap for io-memory area */

#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)

#define SNDRV_PCM_INFO_MMAP_IOMEM	SNDRV_PCM_INFO_MMAP

sound/core/pcm_native.c

+4 −3
Original line number Diff line number Diff line
@@ -3156,7 +3156,7 @@ static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = { 
/*

 * mmap the DMA buffer on RAM

 */

static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,

int snd_pcm_lib_default_mmap(struct snd_pcm_substream *substream,

			     struct vm_area_struct *area)

{

	area->vm_flags |= VM_RESERVED;
@@ -3177,6 +3177,7 @@ static int snd_pcm_default_mmap(struct snd_pcm_substream *substream, 
	area->vm_ops = &snd_pcm_vm_ops_data_fault;

	return 0;

}

EXPORT_SYMBOL_GPL(snd_pcm_lib_default_mmap);



/*

 * mmap the DMA buffer on I/O memory area
@@ -3242,7 +3243,7 @@ int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file, 
	if (substream->ops->mmap)

		err = substream->ops->mmap(substream, area);

	else

		err = snd_pcm_default_mmap(substream, area);

		err = snd_pcm_lib_default_mmap(substream, area);

	if (!err)

		atomic_inc(&substream->mmap_count);

	return err;