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 <[email protected]>

include/sound/pcm.h

@@ -1021,6 +1021,10 @@ int snd_pcm_lib_mmap_iomem(struct snd_pcm_substream *substream, struct vm_area_s
 #define snd_pcm_lib_mmap_iomem	NULL
 #endif
 
+int snd_pcm_lib_mmap_noncached(struct snd_pcm_substream *substream,
+			       struct vm_area_struct *area);
+#define snd_pcm_lib_mmap_vmalloc	snd_pcm_lib_mmap_noncached
+
 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
 {
 	*max = dma < 4 ? 64 * 1024 : 128 * 1024;

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
  */

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,
 };
 
 

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,
 };
 
 /*

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,
 };
 
 

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 *

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,
 };