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-rw-r--r--include/sound/memalloc.h16
1 files changed, 15 insertions, 1 deletions
diff --git a/include/sound/memalloc.h b/include/sound/memalloc.h
index 6a3e7558a7e..7ccce94a525 100644
--- a/include/sound/memalloc.h
+++ b/include/sound/memalloc.h
@@ -63,6 +63,11 @@ struct snd_dma_buffer {
/*
* Scatter-Gather generic device pages
*/
+void *snd_malloc_sgbuf_pages(struct device *device,
+ size_t size, struct snd_dma_buffer *dmab,
+ size_t *res_size);
+int snd_free_sgbuf_pages(struct snd_dma_buffer *dmab);
+
struct snd_sg_page {
void *buf;
dma_addr_t addr;
@@ -90,9 +95,18 @@ static inline unsigned int snd_sgbuf_aligned_pages(size_t size)
*/
static inline dma_addr_t snd_sgbuf_get_addr(struct snd_sg_buf *sgbuf, size_t offset)
{
- return sgbuf->table[offset >> PAGE_SHIFT].addr + offset % PAGE_SIZE;
+ dma_addr_t addr = sgbuf->table[offset >> PAGE_SHIFT].addr;
+ addr &= PAGE_MASK;
+ return addr + offset % PAGE_SIZE;
}
+/*
+ * return the virtual address at the corresponding offset
+ */
+static inline void *snd_sgbuf_get_ptr(struct snd_sg_buf *sgbuf, size_t offset)
+{
+ return sgbuf->table[offset >> PAGE_SHIFT].buf + offset % PAGE_SIZE;
+}
/* allocate/release a buffer */
int snd_dma_alloc_pages(int type, struct device *dev, size_t size,