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, 9 insertions, 0 deletions

diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index a3bcc7ef42f9..28f0208c66a6 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -437,6 +437,12 @@ int agp_bind_memory(struct agp_memory *curr, off_t pg_start)
                 curr->bridge->driver->cache_flush();
                 curr->is_flushed = true;
         }
+
+        if (curr->bridge->driver->agp_map_memory) {
+                ret_val = curr->bridge->driver->agp_map_memory(curr);
+                if (ret_val)
+                        return ret_val;
+        }
         ret_val = curr->bridge->driver->insert_memory(curr, pg_start, curr->type);
 
         if (ret_val != 0)
@@ -478,6 +484,9 @@ int agp_unbind_memory(struct agp_memory *curr)
         if (ret_val != 0)
                 return ret_val;
 
+        if (curr->bridge->driver->agp_unmap_memory)
+                curr->bridge->driver->agp_unmap_memory(curr);
+
         curr->is_bound = false;
         curr->pg_start = 0;
         spin_lock(&curr->bridge->mapped_lock);