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>
diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
index a3bcc7e..28f0208 100644
--- a/drivers/char/agp/generic.c
+++ b/drivers/char/agp/generic.c
@@ -437,6 +437,12 @@
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 @@
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);