drm/i915: Add a live seftest for GEM objects

Starting with a placeholder test just to reassure that we can create a
test object,
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170213171558.20942-18-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/selftests/i915_gem_object.c

@@ -100,6 +100,46 @@ static int igt_phys_object(void *arg)
 	return err;
 }
 
+static int igt_gem_huge(void *arg)
+{
+	const unsigned int nreal = 509; /* just to be awkward */
+	struct drm_i915_private *i915 = arg;
+	struct drm_i915_gem_object *obj;
+	unsigned int n;
+	int err;
+
+	/* Basic sanitycheck of our huge fake object allocation */
+
+	obj = huge_gem_object(i915,
+			      nreal * PAGE_SIZE,
+			      i915->ggtt.base.total + PAGE_SIZE);
+	if (IS_ERR(obj))
+		return PTR_ERR(obj);
+
+	err = i915_gem_object_pin_pages(obj);
+	if (err) {
+		pr_err("Failed to allocate %u pages (%lu total), err=%d\n",
+		       nreal, obj->base.size / PAGE_SIZE, err);
+		goto out;
+	}
+
+	for (n = 0; n < obj->base.size / PAGE_SIZE; n++) {
+		if (i915_gem_object_get_page(obj, n) !=
+		    i915_gem_object_get_page(obj, n % nreal)) {
+			pr_err("Page lookup mismatch at index %u [%u]\n",
+			       n, n % nreal);
+			err = -EINVAL;
+			goto out_unpin;
+		}
+	}
+
+out_unpin:
+	i915_gem_object_unpin_pages(obj);
+out:
+	i915_gem_object_put(obj);
+	return err;
+}
+
 int i915_gem_object_mock_selftests(void)
 {
 	static const struct i915_subtest tests[] = {
@@ -118,3 +158,12 @@ int i915_gem_object_mock_selftests(void)
 	drm_dev_unref(&i915->drm);
 	return err;
 }
+
+int i915_gem_object_live_selftests(struct drm_i915_private *i915)
+{
+	static const struct i915_subtest tests[] = {
+		SUBTEST(igt_gem_huge),
+	};
+
+	return i915_subtests(tests, i915);
+}

drivers/gpu/drm/i915/selftests/i915_live_selftests.h

@@ -10,3 +10,4 @@
  */
 selftest(sanitycheck, i915_live_sanitycheck) /* keep first (igt selfcheck) */
 selftest(requests, i915_gem_request_live_selftests)
+selftest(objects, i915_gem_object_live_selftests)