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ALSA: pcm - Use dma_mmap_coherent() if available 

Use dma_mmap_coherent() for mmapping the buffers allocated via
dma_alloc_coherent() if available.  Currently, only ARM has this function,
so we do temporarily have an ifdef pcm_native.c.  This should be handled
better globally in future.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2009-11-26 12:40:21 +01:00
parent 648f4e3e50
commit 657b1989da
1 changed files with 33 additions and 16 deletions
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49
sound/core/pcm_native.c
View File

@ -26,6 +26,7 @@
#include <linux/time.h>
#include <linux/pm_qos_params.h>
#include <linux/uio.h>
#include <linux/dma-mapping.h>
#include <sound/core.h>
#include <sound/control.h>
#include <sound/info.h>
@ -3094,23 +3095,42 @@ static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
return 0;
}
static const struct vm_operations_struct snd_pcm_vm_ops_data =
{
static const struct vm_operations_struct snd_pcm_vm_ops_data = {
.open = snd_pcm_mmap_data_open,
.close = snd_pcm_mmap_data_close,
};
static const struct vm_operations_struct snd_pcm_vm_ops_data_fault = {
.open = snd_pcm_mmap_data_open,
.close = snd_pcm_mmap_data_close,
.fault = snd_pcm_mmap_data_fault,
};
#ifndef ARCH_HAS_DMA_MMAP_COHERENT
/* This should be defined / handled globally! */
#ifdef CONFIG_ARM
#define ARCH_HAS_DMA_MMAP_COHERENT
#endif
#endif
/*
* mmap the DMA buffer on RAM
*/
static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
struct vm_area_struct *area)
{
area->vm_ops = &snd_pcm_vm_ops_data;
area->vm_private_data = substream;
area->vm_flags |= VM_RESERVED;
atomic_inc(&substream->mmap_count);
#ifdef ARCH_HAS_DMA_MMAP_COHERENT
if (!substream->ops->page &&
substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
return dma_mmap_coherent(substream->dma_buffer.dev.dev,
area,
substream->runtime->dma_area,
substream->runtime->dma_addr,
area->vm_end - area->vm_start);
#endif /* ARCH_HAS_DMA_MMAP_COHERENT */
/* mmap with fault handler */
area->vm_ops = &snd_pcm_vm_ops_data_fault;
return 0;
}
@ -3118,12 +3138,6 @@ static int snd_pcm_default_mmap(struct snd_pcm_substream *substream,
* mmap the DMA buffer on I/O memory area
*/
#if SNDRV_PCM_INFO_MMAP_IOMEM
static const struct vm_operations_struct snd_pcm_vm_ops_data_mmio =
{
.open = snd_pcm_mmap_data_open,
.close = snd_pcm_mmap_data_close,
};
int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
struct vm_area_struct *area)
{
@ -3133,8 +3147,6 @@ int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
#ifdef pgprot_noncached
area->vm_page_prot = pgprot_noncached(area->vm_page_prot);
#endif
area->vm_ops = &snd_pcm_vm_ops_data_mmio;
area->vm_private_data = substream;
area->vm_flags |= VM_IO;
size = area->vm_end - area->vm_start;
offset = area->vm_pgoff << PAGE_SHIFT;
@ -3142,7 +3154,6 @@ int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream,
(substream->runtime->dma_addr + offset) >> PAGE_SHIFT,
size, area->vm_page_prot))
return -EAGAIN;
atomic_inc(&substream->mmap_count);
return 0;
}
@ -3159,6 +3170,7 @@ int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
long size;
unsigned long offset;
size_t dma_bytes;
int err;
if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) {
if (!(area->vm_flags & (VM_WRITE|VM_READ)))
@ -3183,10 +3195,15 @@ int snd_pcm_mmap_data(struct snd_pcm_substream *substream, struct file *file,
if (offset > dma_bytes - size)
return -EINVAL;
area->vm_ops = &snd_pcm_vm_ops_data;
area->vm_private_data = substream;
if (substream->ops->mmap)
return substream->ops->mmap(substream, area);
err = substream->ops->mmap(substream, area);
else
return snd_pcm_default_mmap(substream, area);
err = snd_pcm_default_mmap(substream, area);
if (!err)
atomic_inc(&substream->mmap_count);
return err;
}
EXPORT_SYMBOL(snd_pcm_mmap_data);