agp: Add generic support for graphics dma remapping

New driver hooks for support graphics memory dma remapping
are introduced in this patch. It makes generic code can
tell if current device needs dma remapping, then call driver
provided interfaces for mapping and unmapping. Change has
also been made to handle scratch_page in remapping case.

Signed-off-by: Zhenyu Wang <zhenyu.z.wang@intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/char/agp/agp.h b/drivers/char/agp/agp.h
index ce110a3bf298..17e6d0d3ba36 100644
--- a/drivers/char/agp/agp.h
+++ b/drivers/char/agp/agp.h
@@ -121,6 +121,11 @@ struct agp_bridge_driver {
         void (*agp_destroy_pages)(struct agp_memory *);
         int (*agp_type_to_mask_type) (struct agp_bridge_data *, int);
         void (*chipset_flush)(struct agp_bridge_data *);
+
+        int (*agp_map_page)(void *addr, dma_addr_t *ret);
+        void (*agp_unmap_page)(void *addr, dma_addr_t dma);
+        int (*agp_map_memory)(struct agp_memory *mem);
+        void (*agp_unmap_memory)(struct agp_memory *mem);
 };
 
 struct agp_bridge_data {
@@ -135,6 +140,7 @@ struct agp_bridge_data {
         u32 *gatt_table_real;
         unsigned long scratch_page;
         unsigned long scratch_page_real;
+        dma_addr_t scratch_page_dma;
         unsigned long gart_bus_addr;
         unsigned long gatt_bus_addr;
         u32 mode;