ALSA: Make snd_sgbuf_get_{ptr|addr}() available for non-SG cases

Passing struct snd_dma_buffer pointer instead, so that they work no
matter whether real SG buffer is used or not.

This is a preliminary work for the HD-audio DSP loader code.

Signed-off-by: Ian Minett <ian_minett@creativelabs.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

4 files changed, 66 insertions, 53 deletions

diff --git a/include/sound/memalloc.h b/include/sound/memalloc.h
index c42506212649..844af65af626 100644
--- a/include/sound/memalloc.h
+++ b/include/sound/memalloc.h
@@ -98,8 +98,10 @@ static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
 /*
  * return the physical address at the corresponding offset
  */
-static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset)
+static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
+                                           size_t offset)
 {
+        struct snd_sg_buf *sgbuf = dmab->private_data;
         dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
         addr &= PAGE_MASK;
         return addr + offset % PAGE_SIZE;
@@ -108,10 +110,31 @@ static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t off
 /*
  * return the virtual address at the corresponding offset
  */
-static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf *sgbuf, size_t offset)
+static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
+                                     size_t offset)
 {
+        struct snd_sg_buf *sgbuf = dmab->private_data;
         return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
 }
+
+unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
+                                      unsigned int ofs, unsigned int size);
+#else
+/* non-SG versions */
+static inline dma_addr_t snd_sgbuf_get_addr(struct snd_dma_buffer *dmab,
+                                            size_t offset)
+{
+        return dmab->addr + offset;
+}
+
+static inline void *snd_sgbuf_get_ptr(struct snd_dma_buffer *dmab,
+                                      size_t offset)
+{
+        return dmab->area + offset;
+}
+
+#define snd_sgbuf_get_chunk_size(dmab, ofs, size)       (size)
+
 #endif /* CONFIG_SND_DMA_SGBUF */
 
 /* allocate/release a buffer */
diff --git a/include/sound/pcm.h b/include/sound/pcm.h
index 669c85a7fb03..7e4e4e380106 100644
--- a/include/sound/pcm.h
+++ b/include/sound/pcm.h
@@ -983,53 +983,42 @@ static int snd_pcm_lib_alloc_vmalloc_32_buffer
         _snd_pcm_lib_alloc_vmalloc_buffer \
                         (subs, size, GFP_KERNEL | GFP_DMA32 | __GFP_ZERO)
 
+#define snd_pcm_get_dma_buf(substream) ((substream)->runtime->dma_buffer_p)
+
 #ifdef CONFIG_SND_DMA_SGBUF
 /*
  * SG-buffer handling
  */
 #define snd_pcm_substream_sgbuf(substream) \
-        ((substream)->runtime->dma_buffer_p->private_data)
-
-static inline dma_addr_t
-snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
-{
-        struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
-        return snd_sgbuf_get_addr(sg, ofs);
-}
-
-static inline void *
-snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
-{
-        struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
-        return snd_sgbuf_get_ptr(sg, ofs);
-}
+        snd_pcm_get_dma_buf(substream)->private_data
 
 struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream,
                                     unsigned long offset);
-unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
-                                          unsigned int ofs, unsigned int size);
-
 #else /* !SND_DMA_SGBUF */
 /*
  * fake using a continuous buffer
  */
+#define snd_pcm_sgbuf_ops_page  NULL
+#endif /* SND_DMA_SGBUF */
+
 static inline dma_addr_t
 snd_pcm_sgbuf_get_addr(struct snd_pcm_substream *substream, unsigned int ofs)
 {
-        return substream->runtime->dma_addr + ofs;
+        return snd_sgbuf_get_addr(snd_pcm_get_dma_buf(substream), ofs);
 }
 
 static inline void *
 snd_pcm_sgbuf_get_ptr(struct snd_pcm_substream *substream, unsigned int ofs)
 {
-        return substream->runtime->dma_area + ofs;
+        return snd_sgbuf_get_ptr(snd_pcm_get_dma_buf(substream), ofs);
 }
 
-#define snd_pcm_sgbuf_ops_page  NULL
-
-#define snd_pcm_sgbuf_get_chunk_size(subs, ofs, size)   (size)
-
-#endif /* SND_DMA_SGBUF */
+static inline unsigned int
+snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
+                             unsigned int ofs, unsigned int size)
+{
+        return snd_sgbuf_get_chunk_size(snd_pcm_get_dma_buf(substream), ofs, size);
+}
 
 /* handle mmap counter - PCM mmap callback should handle this counter properly */
 static inline void snd_pcm_mmap_data_open(struct vm_area_struct *area)
diff --git a/sound/core/pcm_memory.c b/sound/core/pcm_memory.c
index 957131366dd9..69e01c4fc32d 100644
--- a/sound/core/pcm_memory.c
+++ b/sound/core/pcm_memory.c
@@ -327,32 +327,6 @@ struct page *snd_pcm_sgbuf_ops_page(struct snd_pcm_substream *substream, unsigne
 }
 
 EXPORT_SYMBOL(snd_pcm_sgbuf_ops_page);
-
-/*
- * compute the max chunk size with continuous pages on sg-buffer
- */
-unsigned int snd_pcm_sgbuf_get_chunk_size(struct snd_pcm_substream *substream,
-                                          unsigned int ofs, unsigned int size)
-{
-        struct snd_sg_buf *sg = snd_pcm_substream_sgbuf(substream);
-        unsigned int start, end, pg;
-
-        start = ofs >> PAGE_SHIFT;
-        end = (ofs + size - 1) >> PAGE_SHIFT;
-        /* check page continuity */
-        pg = sg->table[start].addr >> PAGE_SHIFT;
-        for (;;) {
-                start++;
-                if (start > end)
-                        break;
-                pg++;
-                if ((sg->table[start].addr >> PAGE_SHIFT) != pg)
-                        return (start << PAGE_SHIFT) - ofs;
-        }
-        /* ok, all on continuous pages */
-        return size;
-}
-EXPORT_SYMBOL(snd_pcm_sgbuf_get_chunk_size);
 #endif /* CONFIG_SND_DMA_SGBUF */
 
 /**
diff --git a/sound/core/sgbuf.c b/sound/core/sgbuf.c
index d0f00356fc11..0a418503ec41 100644
--- a/sound/core/sgbuf.c
+++ b/sound/core/sgbuf.c
@@ -22,6 +22,7 @@
 #include <linux/slab.h>
 #include <linux/mm.h>
 #include <linux/vmalloc.h>
+#include <linux/export.h>
 #include <sound/memalloc.h>
 
 
@@ -136,3 +137,29 @@ void *snd_malloc_sgbuf_pages(struct device *device,
         snd_free_sgbuf_pages(dmab); /* free the table */
         return NULL;
 }
+
+/*
+ * compute the max chunk size with continuous pages on sg-buffer
+ */
+unsigned int snd_sgbuf_get_chunk_size(struct snd_dma_buffer *dmab,
+                                      unsigned int ofs, unsigned int size)
+{
+        struct snd_sg_buf *sg = dmab->private_data;
+        unsigned int start, end, pg;
+
+        start = ofs >> PAGE_SHIFT;
+        end = (ofs + size - 1) >> PAGE_SHIFT;
+        /* check page continuity */
+        pg = sg->table[start].addr >> PAGE_SHIFT;
+        for (;;) {
+                start++;
+                if (start > end)
+                        break;
+                pg++;
+                if ((sg->table[start].addr >> PAGE_SHIFT) != pg)
+                        return (start << PAGE_SHIFT) - ofs;
+        }
+        /* ok, all on continuous pages */
+        return size;
+}
+EXPORT_SYMBOL(snd_sgbuf_get_chunk_size);