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-rw-r--r--sound/core/pcm_native.c83
1 files changed, 59 insertions, 24 deletions
diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index ab73edf2c89..29ab46a12e1 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -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>
@@ -3061,6 +3062,27 @@ static int snd_pcm_mmap_control(struct snd_pcm_substream *substream, struct file
}
#endif /* coherent mmap */
+static inline struct page *
+snd_pcm_default_page_ops(struct snd_pcm_substream *substream, unsigned long ofs)
+{
+ void *vaddr = substream->runtime->dma_area + ofs;
+#if defined(CONFIG_MIPS) && defined(CONFIG_DMA_NONCOHERENT)
+ if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV)
+ return virt_to_page(CAC_ADDR(vaddr));
+#endif
+#if defined(CONFIG_PPC32) && defined(CONFIG_NOT_COHERENT_CACHE)
+ if (substream->dma_buffer.dev.type == SNDRV_DMA_TYPE_DEV) {
+ dma_addr_t addr = substream->runtime->dma_addr + ofs;
+ addr -= get_dma_offset(substream->dma_buffer.dev.dev);
+ /* assume dma_handle set via pfn_to_phys() in
+ * mm/dma-noncoherent.c
+ */
+ return pfn_to_page(addr >> PAGE_SHIFT);
+ }
+#endif
+ return virt_to_page(vaddr);
+}
+
/*
* fault callback for mmapping a RAM page
*/
@@ -3071,7 +3093,6 @@ static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
struct snd_pcm_runtime *runtime;
unsigned long offset;
struct page * page;
- void *vaddr;
size_t dma_bytes;
if (substream == NULL)
@@ -3081,36 +3102,53 @@ static int snd_pcm_mmap_data_fault(struct vm_area_struct *area,
dma_bytes = PAGE_ALIGN(runtime->dma_bytes);
if (offset > dma_bytes - PAGE_SIZE)
return VM_FAULT_SIGBUS;
- if (substream->ops->page) {
+ if (substream->ops->page)
page = substream->ops->page(substream, offset);
- if (!page)
- return VM_FAULT_SIGBUS;
- } else {
- vaddr = runtime->dma_area + offset;
- page = virt_to_page(vaddr);
- }
+ else
+ page = snd_pcm_default_page_ops(substream, offset);
+ if (!page)
+ return VM_FAULT_SIGBUS;
get_page(page);
vmf->page = page;
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 +3156,6 @@ 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 +3165,6 @@ 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 +3172,6 @@ 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 +3188,7 @@ 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 +3213,15 @@ 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);