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>

1 files changed, 33 insertions, 16 deletions

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index ab73edf2c89..f067c5b906e 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>
@@ -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);