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: Takashi Iwai <tiwai@suse.de>

6 files changed, 19 insertions, 0 deletions

diff --git a/sound/core/pcm_native.c b/sound/core/pcm_native.c
index 5df0d21f18b3..88fff44702a4 100644
--- a/sound/core/pcm_native.c
+++ b/sound/core/pcm_native.c
@@ -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
  */
diff --git a/sound/drivers/vx/vx_pcm.c b/sound/drivers/vx/vx_pcm.c
index c8385d26a16f..35a2f71a6af5 100644
--- a/sound/drivers/vx/vx_pcm.c
+++ b/sound/drivers/vx/vx_pcm.c
@@ -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,
 };
 
 
diff --git a/sound/mips/sgio2audio.c b/sound/mips/sgio2audio.c
index 9b486beeb932..6aff217379d9 100644
--- a/sound/mips/sgio2audio.c
+++ b/sound/mips/sgio2audio.c
@@ -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,
 };
 
 /*
diff --git a/sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c b/sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c
index 0afa683c900e..0d668f471620 100644
--- a/sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c
+++ b/sound/pcmcia/pdaudiocf/pdaudiocf_pcm.c
@@ -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,
 };
 
 
diff --git a/sound/usb/ua101.c b/sound/usb/ua101.c
index 16dc7bd5e120..4f4ccdf70dd0 100644
--- a/sound/usb/ua101.c
+++ b/sound/usb/ua101.c
@@ -911,6 +911,7 @@ static struct snd_pcm_ops capture_pcm_ops = {
         .trigger = capture_pcm_trigger,
         .pointer = capture_pcm_pointer,
         .page = snd_pcm_lib_get_vmalloc_page,
+        .mmap = snd_pcm_lib_mmap_vmalloc,
 };
 
 static struct snd_pcm_ops playback_pcm_ops = {
@@ -923,6 +924,7 @@ static struct snd_pcm_ops playback_pcm_ops = {
         .trigger = playback_pcm_trigger,
         .pointer = playback_pcm_pointer,
         .page = snd_pcm_lib_get_vmalloc_page,
+        .mmap = snd_pcm_lib_mmap_vmalloc,
 };
 
 static const struct uac_format_type_i_discrete_descriptor *
diff --git a/sound/usb/usbaudio.c b/sound/usb/usbaudio.c
index 4ada98e16309..b8e0b8fda607 100644
--- a/sound/usb/usbaudio.c
+++ b/sound/usb/usbaudio.c
@@ -1997,6 +1997,7 @@ static struct snd_pcm_ops snd_usb_playback_ops = {
         .trigger =      snd_usb_pcm_playback_trigger,
         .pointer =      snd_usb_pcm_pointer,
         .page =         snd_pcm_lib_get_vmalloc_page,
+        .mmap =         snd_pcm_lib_mmap_vmalloc,
 };
 
 static struct snd_pcm_ops snd_usb_capture_ops = {
@@ -2009,6 +2010,7 @@ static struct snd_pcm_ops snd_usb_capture_ops = {
         .trigger =      snd_usb_pcm_capture_trigger,
         .pointer =      snd_usb_pcm_pointer,
         .page =         snd_pcm_lib_get_vmalloc_page,
+        .mmap =         snd_pcm_lib_mmap_vmalloc,
 };