ALSA: Allocate larger pages in sgbuf

[linux-2.6-omap-h63xx.git] / include / sound / memalloc.h

diff --git a/include/sound/memalloc.h b/include/sound/memalloc.h
index 83489c3abbaf5f048293c4aea3041da63143a879..d787a6b4a10123006f1384ffc61153ec9c9a733c 100644 (file)
--- a/include/sound/memalloc.h
+++ b/include/sound/memalloc.h
@@ -1,5 +1,5 @@
 /*
- *  Copyright (c) by Jaroslav Kysela <perex@suse.cz>
+ *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
  *                   Takashi Iwai <tiwai@suse.de>
  * 
  *  Generic memory allocators
@@ -65,6 +65,11 @@ 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;
@@ -92,9 +97,18 @@ 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,