diff --git a/libdrm/intel/intel_bufmgr.h b/libdrm/intel/intel_bufmgr.h
index 111d2af..542dc06 100644
--- a/libdrm/intel/intel_bufmgr.h
+++ b/libdrm/intel/intel_bufmgr.h
@@ -115,6 +115,7 @@ drm_intel_bo *drm_intel_bo_gem_create_from_name(drm_intel_bufmgr *bufmgr,
 						unsigned int handle);
 void drm_intel_bufmgr_gem_enable_reuse(drm_intel_bufmgr *bufmgr);
 int drm_intel_gem_bo_map_gtt(drm_intel_bo *bo);
+int drm_intel_gem_bo_unmap_gtt(drm_intel_bo *bo);
 void drm_intel_gem_bo_start_gtt_access(drm_intel_bo *bo, int write_enable);
 
 /* drm_intel_bufmgr_fake.c */
diff --git a/libdrm/intel/intel_bufmgr_gem.c b/libdrm/intel/intel_bufmgr_gem.c
index 6ddecf4..a40177c 100644
--- a/libdrm/intel/intel_bufmgr_gem.c
+++ b/libdrm/intel/intel_bufmgr_gem.c
@@ -719,7 +719,7 @@ drm_intel_gem_bo_map_gtt(drm_intel_bo *bo)
     } while (ret == -1 && errno == EINTR);
 
     if (ret != 0) {
-	    fprintf (stderr, "%s:%d: Error setting swrast %d: %s\n",
+	    fprintf (stderr, "%s:%d: Error setting domain %d: %s\n",
 		     __FILE__, __LINE__, bo_gem->gem_handle, strerror (errno));
     }
 
@@ -728,6 +728,27 @@ drm_intel_gem_bo_map_gtt(drm_intel_bo *bo)
     return 0;
 }
 
+int
+drm_intel_gem_bo_unmap_gtt(drm_intel_bo *bo)
+{
+    drm_intel_bufmgr_gem *bufmgr_gem = (drm_intel_bufmgr_gem *)bo->bufmgr;
+    drm_intel_bo_gem *bo_gem = (drm_intel_bo_gem *)bo;
+    struct drm_i915_gem_sw_finish sw_finish;
+    int ret = 0;
+
+    if (bo == NULL)
+	return 0;
+
+    assert(bo_gem->virtual != NULL);
+
+    pthread_mutex_lock(&bufmgr_gem->lock);
+    munmap(bo_gem->virtual, bo->size);
+    bo_gem->virtual = bo->virtual = NULL;
+    pthread_mutex_unlock(&bufmgr_gem->lock);
+
+    return ret;
+}
+
 static int
 drm_intel_gem_bo_unmap(drm_intel_bo *bo)
 {
@@ -750,6 +771,7 @@ drm_intel_gem_bo_unmap(drm_intel_bo *bo)
 	} while (ret == -1 && errno == EINTR);
 	bo_gem->swrast = 0;
     }
+    bo->virtual = bo_gem->virtual = NULL;
     pthread_mutex_unlock(&bufmgr_gem->lock);
     return 0;
 }