drm: update user token hashing and map handles

Keep hashed user tokens, with the following changes:
32-bit physical device addresses are mapped directly to user-tokens. No
    duplicate maps are allowed, and the addresses are assumed to be outside
    of the range 0x10000000 through 0x30000000. The user-token is identical
    to the 32-bit physical start-address of the map.
64-bit physical device addressed are mapped to user-tokens in the range
0x10000000 to 0x30000000 with page-size increments. The user_token should
    not be interpreted as an address.
Other map types, like upcoming TTM maps are mapped to user-tokens in the
    range
0x10000000 to 0x30000000 with page-size increments. The user_token should
    not be interpreted as an address.

Implement hashed map lookups.

Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/char/drm/drmP.h b/drivers/char/drm/drmP.h
index fedaf013f84..84e9c18fdbe 100644
--- a/drivers/char/drm/drmP.h
+++ b/drivers/char/drm/drmP.h
@@ -140,6 +140,7 @@
 #define DRM_MEM_HASHTAB   23
 
 #define DRM_MAX_CTXBITMAP (PAGE_SIZE * 8)
+#define DRM_MAP_HASH_OFFSET 0x10000000
 
 /*@}*/
 
@@ -485,6 +486,7 @@ typedef struct drm_sigdata {
  */
 typedef struct drm_map_list {
         struct list_head head;          /**< list head */
+        drm_hash_item_t hash;
         drm_map_t *map;                 /**< mapping */
         unsigned int user_token;
 } drm_map_list_t;
@@ -662,6 +664,7 @@ typedef struct drm_device {
         /*@{ */
         drm_map_list_t *maplist;        /**< Linked list of regions */
         int map_count;                  /**< Number of mappable regions */
+        drm_open_hash_t map_hash;       /**< User token hash table for maps */
 
         /** \name Context handle management */
         /*@{ */