igt: Report the global GTT size

For many tests, the relevant aperture is not the ppGTT but the internal
global GTT managed by the kernel. Use this limit appropriately.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

lib/ioctl_wrappers.c

@@ -1226,25 +1226,6 @@ bool gem_has_bsd2(int fd)
 		has_bsd2 = gem_has_enable_ring(fd,LOCAL_I915_PARAM_HAS_BSD2);
 	return has_bsd2;
 }
-/**
- * gem_available_aperture_size:
- * @fd: open i915 drm file descriptor
- *
- * Feature test macro to query the kernel for the available gpu aperture size
- * usable in a batchbuffer.
- *
- * Returns: The available gtt address space size.
- */
-uint64_t gem_available_aperture_size(int fd)
-{
-	struct drm_i915_gem_get_aperture aperture;
-
-	memset(&aperture, 0, sizeof(aperture));
-	aperture.aper_size = 256*1024*1024;
-	do_ioctl(fd, DRM_IOCTL_I915_GEM_GET_APERTURE, &aperture);
-
-	return aperture.aper_available_size;
-}
 
 /**
  * gem_aperture_size:
@@ -1300,6 +1281,25 @@ uint64_t gem_mappable_aperture_size(void)
 	return pci_dev->regions[bar].size;
 }
 
+/**
+ * gem_global_aperture_size:
+ *
+ * Feature test macro to query the kernel for the global gpu aperture size.
+ * This is the area available for the kernel to perform address translations.
+ *
+ * Returns: The mappable gtt address space size.
+ */
+uint64_t gem_global_aperture_size(int fd)
+{
+	struct drm_i915_gem_get_aperture aperture;
+
+	memset(&aperture, 0, sizeof(aperture));
+	aperture.aper_size = 256*1024*1024;
+	do_ioctl(fd, DRM_IOCTL_I915_GEM_GET_APERTURE, &aperture);
+
+	return aperture.aper_size;
+}
+
 #define LOCAL_I915_PARAM_HAS_EXEC_SOFTPIN 37
 /**
  * gem_has_softpin:

lib/ioctl_wrappers.h

@@ -143,8 +143,8 @@ int gem_gtt_type(int fd);
 bool gem_uses_ppgtt(int fd);
 bool gem_uses_full_ppgtt(int fd);
 int gem_available_fences(int fd);
-uint64_t gem_available_aperture_size(int fd);
 uint64_t gem_aperture_size(int fd);
+uint64_t gem_global_aperture_size(int fd);
 uint64_t gem_mappable_aperture_size(void);
 bool gem_has_softpin(int fd);