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>
diff --git a/drivers/char/drm/drm_stub.c b/drivers/char/drm/drm_stub.c
index b1ead37..a9bb18a 100644
--- a/drivers/char/drm/drm_stub.c
+++ b/drivers/char/drm/drm_stub.c
@@ -75,6 +75,10 @@
if (dev->maplist == NULL)
return -ENOMEM;
INIT_LIST_HEAD(&dev->maplist->head);
+ if (drm_ht_create(&dev->map_hash, 12)) {
+ drm_free(dev->maplist, sizeof(*dev->maplist), DRM_MEM_MAPS);
+ return -ENOMEM;
+ }
/* the DRM has 6 basic counters */
dev->counters = 6;