[PATCH] sparc ALSA fix

sound/core/pcm_native.c was assuming that all architectures implement
io_remap_page_range() in the same way.  They don't, so the sparc64 build
broke.

mmap callback is added to PCM ops.  The driver can implement its own mmap
method.

Also, mmapping of the status and control records is available only on known
coherent architectures now.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/sound/asound.h

@@ -275,7 +275,6 @@ enum sndrv_pcm_subformat {
 #define SNDRV_PCM_INFO_HALF_DUPLEX	0x00100000	/* only half duplex */
 #define SNDRV_PCM_INFO_JOINT_DUPLEX	0x00200000	/* playback and capture stream are somewhat correlated */
 #define SNDRV_PCM_INFO_SYNC_START	0x00400000	/* pcm support some kind of sync go */
-#define SNDRV_PCM_INFO_MMAP_IOMEM	0x01000000	/* mmap on IO memory */
 
 enum sndrv_pcm_state {
 	SNDRV_PCM_STATE_OPEN = 0,	/* stream is open */

include/sound/pcm.h

@@ -97,6 +97,7 @@ typedef struct _snd_pcm_ops {
 	int (*silence)(snd_pcm_substream_t *substream, int channel, 
 		       snd_pcm_uframes_t pos, snd_pcm_uframes_t count);
 	struct page *(*page)(snd_pcm_substream_t *substream, unsigned long offset);
+	int (*mmap)(snd_pcm_substream_t *substream, struct vm_area_struct *vma);
 	int (*ack)(snd_pcm_substream_t *substream);
 } snd_pcm_ops_t;
 
@@ -938,6 +939,28 @@ int snd_pcm_lib_free_pages(snd_pcm_substream_t *substream);
 #define snd_pcm_sgbuf_get_addr(sgbuf,ofs) snd_sgbuf_get_addr(sgbuf,ofs)
 struct page *snd_pcm_sgbuf_ops_page(snd_pcm_substream_t *substream, unsigned long offset);
 
+/* handle mmap counter - PCM mmap callback should handle this counter properly */
+static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
+{
+	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
+	atomic_inc(&substream->runtime->mmap_count);
+}
+
+static inline void snd_pcm_mmap_data_close(struct vm_area_struct *area)
+{
+	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
+	atomic_dec(&substream->runtime->mmap_count);
+}
+
+/* mmap for io-memory area */
+#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
+#define SNDRV_PCM_INFO_MMAP_IOMEM	SNDRV_PCM_INFO_MMAP
+int snd_pcm_lib_mmap_iomem(snd_pcm_substream_t *substream, struct vm_area_struct *area);
+#else
+#define SNDRV_PCM_INFO_MMAP_IOMEM	0
+#define snd_pcm_lib_mmap_iomem	NULL
+#endif
+
 static inline void snd_pcm_limit_isa_dma_size(int dma, size_t *max)
 {
 	*max = dma < 4 ? 64 * 1024 : 128 * 1024;

sound/core/pcm.c

@@ -1050,6 +1050,9 @@ EXPORT_SYMBOL(snd_pcm_release);
 EXPORT_SYMBOL(snd_pcm_playback_poll);
 EXPORT_SYMBOL(snd_pcm_capture_poll);
 EXPORT_SYMBOL(snd_pcm_mmap_data);
+#if SNDRV_PCM_INFO_MMAP_IOMEM
+EXPORT_SYMBOL(snd_pcm_lib_mmap_iomem);
+#endif
  /* pcm_misc.c */
 EXPORT_SYMBOL(snd_pcm_format_signed);
 EXPORT_SYMBOL(snd_pcm_format_unsigned);

sound/core/pcm_native.c

@@ -2908,6 +2908,18 @@ unsigned int snd_pcm_capture_poll(struct file *file, poll_table * wait)
 	return mask;
 }
 
+/*
+ * mmap support
+ */
+
+/*
+ * Only on coherent architectures, we can mmap the status and the control records
+ * for effcient data transfer.  On others, we have to use HWSYNC ioctl...
+ */
+#if defined(CONFIG_X86) || defined(CONFIG_PPC) || defined(CONFIG_ALPHA)
+/*
+ * mmap status record
+ */
 static struct page * snd_pcm_mmap_status_nopage(struct vm_area_struct *area, unsigned long address, int *type)
 {
 	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
@@ -2930,8 +2942,8 @@ static struct vm_operations_struct snd_pcm_vm_ops_status =
 	.nopage =	snd_pcm_mmap_status_nopage,
 };
 
-int snd_pcm_mmap_status(snd_pcm_substream_t *substream, struct file *file,
-			struct vm_area_struct *area)
+static int snd_pcm_mmap_status(snd_pcm_substream_t *substream, struct file *file,
+			       struct vm_area_struct *area)
 {
 	snd_pcm_runtime_t *runtime;
 	long size;
@@ -2948,6 +2960,9 @@ int snd_pcm_mmap_status(snd_pcm_substream_t *substream, struct file *file,
 	return 0;
 }
 
+/*
+ * mmap control record
+ */
 static struct page * snd_pcm_mmap_control_nopage(struct vm_area_struct *area, unsigned long address, int *type)
 {
 	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
@@ -2987,20 +3002,26 @@ static int snd_pcm_mmap_control(snd_pcm_substream_t *substream, struct file *fil
 	area->vm_flags |= VM_RESERVED;
 	return 0;
 }
-
-static void snd_pcm_mmap_data_open(struct vm_area_struct *area)
+#else /* ! coherent mmap */
+/*
+ * don't support mmap for status and control records.
+ */
+static int snd_pcm_mmap_status(snd_pcm_substream_t *substream, struct file *file,
+			       struct vm_area_struct *area)
 {
-	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
-	atomic_inc(&substream->runtime->mmap_count);
+	return -ENXIO;
 }
-
-static void snd_pcm_mmap_data_close(struct vm_area_struct *area)
+static int snd_pcm_mmap_control(snd_pcm_substream_t *substream, struct file *file,
+				struct vm_area_struct *area)
 {
-	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
-	atomic_dec(&substream->runtime->mmap_count);
+	return -ENXIO;
 }
+#endif /* coherent mmap */
 
-static struct page * snd_pcm_mmap_data_nopage(struct vm_area_struct *area, unsigned long address, int *type)
+/*
+ * nopage callback for mmapping a RAM page
+ */
+static struct page *snd_pcm_mmap_data_nopage(struct vm_area_struct *area, unsigned long address, int *type)
 {
 	snd_pcm_substream_t *substream = (snd_pcm_substream_t *)area->vm_private_data;
 	snd_pcm_runtime_t *runtime;
@@ -3040,12 +3061,52 @@ static struct vm_operations_struct snd_pcm_vm_ops_data =
 	.nopage =	snd_pcm_mmap_data_nopage,
 };
 
+/*
+ * mmap the DMA buffer on RAM
+ */
+static int snd_pcm_default_mmap(snd_pcm_substream_t *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->runtime->mmap_count);
+	return 0;
+}
+
+/*
+ * mmap the DMA buffer on I/O memory area
+ */
+#if SNDRV_PCM_INFO_MMAP_IOMEM
 static 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(snd_pcm_substream_t *substream, struct vm_area_struct *area)
+{
+	long size;
+	unsigned long offset;
+
+#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_flags |= VM_IO;
+	size = area->vm_end - area->vm_start;
+	offset = area->vm_pgoff << PAGE_SHIFT;
+	if (io_remap_page_range(area, area->vm_start,
+				substream->runtime->dma_addr + offset,
+				size, area->vm_page_prot))
+		return -EAGAIN;
+	atomic_inc(&substream->runtime->mmap_count);
+	return 0;
+}
+#endif /* SNDRV_PCM_INFO_MMAP */
+
+/*
+ * mmap DMA buffer
+ */
 int snd_pcm_mmap_data(snd_pcm_substream_t *substream, struct file *file,
 		      struct vm_area_struct *area)
 {
@@ -3078,19 +3139,10 @@ int snd_pcm_mmap_data(snd_pcm_substream_t *substream, struct file *file,
 	if (offset > dma_bytes - size)
 		return -EINVAL;
 
-	area->vm_ops = &snd_pcm_vm_ops_data;
-	area->vm_private_data = substream;
-	area->vm_flags |= VM_RESERVED;
-	if (runtime->hw.info & SNDRV_PCM_INFO_MMAP_IOMEM) {
-		area->vm_ops = &snd_pcm_vm_ops_data_mmio;
-		area->vm_flags |= VM_IO;
-		if (io_remap_page_range(area, area->vm_start,
-					runtime->dma_addr + offset,
-					size, area->vm_page_prot))
-			return -EAGAIN;
-	}
-	atomic_inc(&runtime->mmap_count);
-	return 0;
+	if (substream->ops->mmap)
+		return substream->ops->mmap(substream, area);
+	else
+		return snd_pcm_default_mmap(substream, area);
 }
 
 static int snd_pcm_mmap(struct file *file, struct vm_area_struct *area)

sound/pci/nm256/nm256.c

@@ -742,8 +742,7 @@ snd_nm256_capture_update(nm256_t *chip)
  */
 static snd_pcm_hardware_t snd_nm256_playback =
 {
-	.info =			SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID|
-				SNDRV_PCM_INFO_MMAP_IOMEM|
+	.info =			SNDRV_PCM_INFO_MMAP_IOMEM |SNDRV_PCM_INFO_MMAP_VALID |
 				SNDRV_PCM_INFO_INTERLEAVED |
 				/*SNDRV_PCM_INFO_PAUSE |*/
 				SNDRV_PCM_INFO_RESUME,
@@ -762,8 +761,7 @@ static snd_pcm_hardware_t snd_nm256_playback =
 
 static snd_pcm_hardware_t snd_nm256_capture =
 {
-	.info =			SNDRV_PCM_INFO_MMAP|SNDRV_PCM_INFO_MMAP_VALID|
-				SNDRV_PCM_INFO_MMAP_IOMEM|
+	.info =			SNDRV_PCM_INFO_MMAP_IOMEM | SNDRV_PCM_INFO_MMAP_VALID |
 				SNDRV_PCM_INFO_INTERLEAVED |
 				/*SNDRV_PCM_INFO_PAUSE |*/
 				SNDRV_PCM_INFO_RESUME,
@@ -864,6 +862,7 @@ static snd_pcm_ops_t snd_nm256_playback_ops = {
 	.copy =		snd_nm256_playback_copy,
 	.silence =	snd_nm256_playback_silence,
 #endif
+	.mmap =		snd_pcm_lib_mmap_iomem,
 };
 
 static snd_pcm_ops_t snd_nm256_capture_ops = {
@@ -877,6 +876,7 @@ static snd_pcm_ops_t snd_nm256_capture_ops = {
 #ifndef __i386__
 	.copy =		snd_nm256_capture_copy,
 #endif
+	.mmap =		snd_pcm_lib_mmap_iomem,
 };
 
 static int __devinit

sound/pci/rme32.c

@@ -331,9 +331,8 @@ static int snd_rme32_capture_copy(snd_pcm_substream_t * substream, int channel,
  * SPDIF I/O capabilites (half-duplex mode)
  */
 static snd_pcm_hardware_t snd_rme32_spdif_info = {
-	.info =		(SNDRV_PCM_INFO_MMAP |
+	.info =		(SNDRV_PCM_INFO_MMAP_IOMEM |
 			 SNDRV_PCM_INFO_MMAP_VALID |
-			 SNDRV_PCM_INFO_MMAP_IOMEM |
 			 SNDRV_PCM_INFO_INTERLEAVED | 
 			 SNDRV_PCM_INFO_PAUSE |
 			 SNDRV_PCM_INFO_SYNC_START),
@@ -359,9 +358,8 @@ static snd_pcm_hardware_t snd_rme32_spdif_info = {
  */
 static snd_pcm_hardware_t snd_rme32_adat_info =
 {
-	.info =		     (SNDRV_PCM_INFO_MMAP |
+	.info =		     (SNDRV_PCM_INFO_MMAP_IOMEM |
 			      SNDRV_PCM_INFO_MMAP_VALID |
-			      SNDRV_PCM_INFO_MMAP_IOMEM |
 			      SNDRV_PCM_INFO_INTERLEAVED |
 			      SNDRV_PCM_INFO_PAUSE |
 			      SNDRV_PCM_INFO_SYNC_START),
@@ -1246,6 +1244,7 @@ static snd_pcm_ops_t snd_rme32_playback_spdif_ops = {
 	.pointer =	snd_rme32_playback_pointer,
 	.copy =		snd_rme32_playback_copy,
 	.silence =	snd_rme32_playback_silence,
+	.mmap =		snd_pcm_lib_mmap_iomem,
 };
 
 static snd_pcm_ops_t snd_rme32_capture_spdif_ops = {
@@ -1258,6 +1257,7 @@ static snd_pcm_ops_t snd_rme32_capture_spdif_ops = {
 	.trigger =	snd_rme32_pcm_trigger,
 	.pointer =	snd_rme32_capture_pointer,
 	.copy =		snd_rme32_capture_copy,
+	.mmap =		snd_pcm_lib_mmap_iomem,
 };
 
 static snd_pcm_ops_t snd_rme32_playback_adat_ops = {
@@ -1270,6 +1270,7 @@ static snd_pcm_ops_t snd_rme32_playback_adat_ops = {
 	.pointer =	snd_rme32_playback_pointer,
 	.copy =		snd_rme32_playback_copy,
 	.silence =	snd_rme32_playback_silence,
+	.mmap =		snd_pcm_lib_mmap_iomem,
 };
 
 static snd_pcm_ops_t snd_rme32_capture_adat_ops = {
@@ -1281,6 +1282,7 @@ static snd_pcm_ops_t snd_rme32_capture_adat_ops = {
 	.trigger =	snd_rme32_pcm_trigger,
 	.pointer =	snd_rme32_capture_pointer,
 	.copy =		snd_rme32_capture_copy,
+	.mmap =		snd_pcm_lib_mmap_iomem,
 };
 
 /* for fullduplex mode */

sound/pci/rme96.c

@@ -383,9 +383,8 @@ snd_rme96_capture_copy(snd_pcm_substream_t *substream,
  */
 static snd_pcm_hardware_t snd_rme96_playback_spdif_info =
 {
-	.info =		     (SNDRV_PCM_INFO_MMAP |
+	.info =		     (SNDRV_PCM_INFO_MMAP_IOMEM |
 			      SNDRV_PCM_INFO_MMAP_VALID |
-			      SNDRV_PCM_INFO_MMAP_IOMEM |
 			      SNDRV_PCM_INFO_INTERLEAVED |
 			      SNDRV_PCM_INFO_PAUSE),
 	.formats =	     (SNDRV_PCM_FMTBIT_S16_LE |
@@ -413,9 +412,8 @@ static snd_pcm_hardware_t snd_rme96_playback_spdif_info =
  */
 static snd_pcm_hardware_t snd_rme96_capture_spdif_info =
 {
-	.info =		     (SNDRV_PCM_INFO_MMAP |
+	.info =		     (SNDRV_PCM_INFO_MMAP_IOMEM |
 			      SNDRV_PCM_INFO_MMAP_VALID |
-			      SNDRV_PCM_INFO_MMAP_IOMEM |
 			      SNDRV_PCM_INFO_INTERLEAVED |
 			      SNDRV_PCM_INFO_PAUSE),
 	.formats =	     (SNDRV_PCM_FMTBIT_S16_LE |
@@ -443,9 +441,8 @@ static snd_pcm_hardware_t snd_rme96_capture_spdif_info =
  */
 static snd_pcm_hardware_t snd_rme96_playback_adat_info =
 {
-	.info =		     (SNDRV_PCM_INFO_MMAP |
+	.info =		     (SNDRV_PCM_INFO_MMAP_IOMEM |
 			      SNDRV_PCM_INFO_MMAP_VALID |
-			      SNDRV_PCM_INFO_MMAP_IOMEM |
 			      SNDRV_PCM_INFO_INTERLEAVED |
 			      SNDRV_PCM_INFO_PAUSE),
 	.formats =	     (SNDRV_PCM_FMTBIT_S16_LE |
@@ -469,9 +466,8 @@ static snd_pcm_hardware_t snd_rme96_playback_adat_info =
  */
 static snd_pcm_hardware_t snd_rme96_capture_adat_info =
 {
-	.info =		     (SNDRV_PCM_INFO_MMAP |
+	.info =		     (SNDRV_PCM_INFO_MMAP_IOMEM |
 			      SNDRV_PCM_INFO_MMAP_VALID |
-			      SNDRV_PCM_INFO_MMAP_IOMEM |
 			      SNDRV_PCM_INFO_INTERLEAVED |
 			      SNDRV_PCM_INFO_PAUSE),
 	.formats =	     (SNDRV_PCM_FMTBIT_S16_LE |
@@ -1494,6 +1490,7 @@ static snd_pcm_ops_t snd_rme96_playback_spdif_ops = {
 	.pointer =	snd_rme96_playback_pointer,
 	.copy =		snd_rme96_playback_copy,
 	.silence =	snd_rme96_playback_silence,
+	.mmap =		snd_pcm_lib_mmap_iomem,
 };
 
 static snd_pcm_ops_t snd_rme96_capture_spdif_ops = {
@@ -1505,6 +1502,7 @@ static snd_pcm_ops_t snd_rme96_capture_spdif_ops = {
 	.trigger =	snd_rme96_capture_trigger,
 	.pointer =	snd_rme96_capture_pointer,
 	.copy =		snd_rme96_capture_copy,
+	.mmap =		snd_pcm_lib_mmap_iomem,
 };
 
 static snd_pcm_ops_t snd_rme96_playback_adat_ops = {
@@ -1517,6 +1515,7 @@ static snd_pcm_ops_t snd_rme96_playback_adat_ops = {
 	.pointer =	snd_rme96_playback_pointer,
 	.copy =		snd_rme96_playback_copy,
 	.silence =	snd_rme96_playback_silence,
+	.mmap =		snd_pcm_lib_mmap_iomem,
 };
 
 static snd_pcm_ops_t snd_rme96_capture_adat_ops = {
@@ -1528,6 +1527,7 @@ static snd_pcm_ops_t snd_rme96_capture_adat_ops = {
 	.trigger =	snd_rme96_capture_trigger,
 	.pointer =	snd_rme96_capture_pointer,
 	.copy =		snd_rme96_capture_copy,
+	.mmap =		snd_pcm_lib_mmap_iomem,
 };
 
 static void