i965: Embrace "unlimited" GTT mmap support

[mesa.git] / src / mesa / drivers / dri / i965 / brw_context.c

diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index d6f0d7bbcb36c3d44e24f5327517ffbb47959057..13643930e38f3ee12645361b2cd8ddd649711560 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -1044,21 +1044,6 @@ brwCreateContext(gl_api api,
    brw->urb.max_ds_entries = devinfo->urb.max_ds_entries;
    brw->urb.max_gs_entries = devinfo->urb.max_gs_entries;
 
-   /* Estimate the size of the mappable aperture into the GTT.  There's an
-    * ioctl to get the whole GTT size, but not one to get the mappable subset.
-    * It turns out it's basically always 256MB, though some ancient hardware
-    * was smaller.
-    */
-   uint32_t gtt_size = 256 * 1024 * 1024;
-
-   /* We don't want to map two objects such that a memcpy between them would
-    * just fault one mapping in and then the other over and over forever.  So
-    * we would need to divide the GTT size by 2.  Additionally, some GTT is
-    * taken up by things like the framebuffer and the ringbuffer and such, so
-    * be more conservative.
-    */
-   brw->max_gtt_map_object_size = gtt_size / 4;
-
    if (brw->gen == 6)
       brw->urb.gs_present = false;
 
@@ -1069,6 +1054,8 @@ brwCreateContext(gl_api api,
 
    brw->predicate.state = BRW_PREDICATE_STATE_RENDER;
 
+   brw->max_gtt_map_object_size = screen->max_gtt_map_object_size;
+
    brw->use_resource_streamer = screen->has_resource_streamer &&
       (env_var_as_boolean("INTEL_USE_HW_BT", false) ||
        env_var_as_boolean("INTEL_USE_GATHER", false));