Merge branch 'sg' of git://git.kernel.dk/linux-2.6-block

[pandora-kernel.git] / include / linux / scatterlist.h

diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index df7ddce..4571231 100644 (file)
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -1,6 +1,7 @@
 #ifndef _LINUX_SCATTERLIST_H
 #define _LINUX_SCATTERLIST_H
 
+#include <asm/types.h>
 #include <asm/scatterlist.h>
 #include <linux/mm.h>
 #include <linux/string.h>
@@ -26,18 +27,16 @@
 #define SG_MAGIC       0x87654321
 
 /**
- * sg_set_page - Set sg entry to point at given page
- * @sg:                 SG entry
- * @page:       The page
+ * sg_assign_page - Assign a given page to an SG entry
+ * @sg:                    SG entry
+ * @page:          The page
  *
  * Description:
- *   Use this function to set an sg entry pointing at a page, never assign
- *   the page directly. We encode sg table information in the lower bits
- *   of the page pointer. See sg_page() for looking up the page belonging
- *   to an sg entry.
+ *   Assign page to sg entry. Also see sg_set_page(), the most commonly used
+ *   variant.
  *
  **/
-static inline void sg_set_page(struct scatterlist *sg, struct page *page)
+static inline void sg_assign_page(struct scatterlist *sg, struct page *page)
 {
        unsigned long page_link = sg->page_link & 0x3;
 
@@ -52,6 +51,28 @@ static inline void sg_set_page(struct scatterlist *sg, struct page *page)
        sg->page_link = page_link | (unsigned long) page;
 }
 
+/**
+ * sg_set_page - Set sg entry to point at given page
+ * @sg:                 SG entry
+ * @page:       The page
+ * @len:        Length of data
+ * @offset:     Offset into page
+ *
+ * Description:
+ *   Use this function to set an sg entry pointing at a page, never assign
+ *   the page directly. We encode sg table information in the lower bits
+ *   of the page pointer. See sg_page() for looking up the page belonging
+ *   to an sg entry.
+ *
+ **/
+static inline void sg_set_page(struct scatterlist *sg, struct page *page,
+                              unsigned int len, unsigned int offset)
+{
+       sg_assign_page(sg, page);
+       sg->offset = offset;
+       sg->length = len;
+}
+
 #define sg_page(sg)    ((struct page *) ((sg)->page_link & ~0x3))
 
 /**
@@ -64,9 +85,7 @@ static inline void sg_set_page(struct scatterlist *sg, struct page *page)
 static inline void sg_set_buf(struct scatterlist *sg, const void *buf,
                              unsigned int buflen)
 {
-       sg_set_page(sg, virt_to_page(buf));
-       sg->offset = offset_in_page(buf);
-       sg->length = buflen;
+       sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
 }
 
 /*
@@ -237,7 +256,7 @@ static inline void sg_init_table(struct scatterlist *sgl, unsigned int nents)
  *   on the sg page.
  *
  **/
-static inline unsigned long sg_phys(struct scatterlist *sg)
+static inline dma_addr_t sg_phys(struct scatterlist *sg)
 {
        return page_to_phys(sg_page(sg)) + sg->offset;
 }