drm: add drm_exec selftests v4

Exercise at least all driver facing functions of this new component.

v2: add array test as well
v3: some kunit cleanups
v4: more tests and cleanups

Signed-off-by: Christian König <christian.koenig@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230711133122.3710-3-christian.koenig@amd.com

drivers/gpu/drm/Kconfig

@@ -80,6 +80,7 @@ config DRM_KUNIT_TEST
 	select DRM_BUDDY
 	select DRM_EXPORT_FOR_TESTS if m
 	select DRM_KUNIT_TEST_HELPERS
+	select DRM_EXEC
 	default KUNIT_ALL_TESTS
 	help
 	  This builds unit tests for DRM. This option is not useful for

drivers/gpu/drm/tests/Makefile

@@ -17,6 +17,7 @@ obj-$(CONFIG_DRM_KUNIT_TEST) += \
 	drm_modes_test.o \
 	drm_plane_helper_test.o \
 	drm_probe_helper_test.o \
-	drm_rect_test.o
+	drm_rect_test.o	\
+	drm_exec_test.o
 
 CFLAGS_drm_mm_test.o := $(DISABLE_STRUCTLEAK_PLUGIN)

drivers/gpu/drm/tests/drm_exec_test.c

@@ -0,0 +1,159 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright 2022 Advanced Micro Devices, Inc.
+ */
+
+#define pr_fmt(fmt) "drm_exec: " fmt
+
+#include <kunit/test.h>
+
+#include <linux/module.h>
+#include <linux/prime_numbers.h>
+
+#include <drm/drm_exec.h>
+#include <drm/drm_device.h>
+#include <drm/drm_gem.h>
+
+#include "../lib/drm_random.h"
+
+static struct drm_device dev;
+
+static void sanitycheck(struct kunit *test)
+{
+	struct drm_exec exec;
+
+	drm_exec_init(&exec, DRM_EXEC_INTERRUPTIBLE_WAIT);
+	drm_exec_fini(&exec);
+	KUNIT_SUCCEED(test);
+}
+
+static void test_lock(struct kunit *test)
+{
+	struct drm_gem_object gobj = { };
+	struct drm_exec exec;
+	int ret;
+
+	drm_gem_private_object_init(&dev, &gobj, PAGE_SIZE);
+
+	drm_exec_init(&exec, DRM_EXEC_INTERRUPTIBLE_WAIT);
+	drm_exec_until_all_locked(&exec) {
+		ret = drm_exec_lock_obj(&exec, &gobj);
+		drm_exec_retry_on_contention(&exec);
+		KUNIT_EXPECT_EQ(test, ret, 0);
+		if (ret)
+			break;
+	}
+	drm_exec_fini(&exec);
+}
+
+static void test_lock_unlock(struct kunit *test)
+{
+	struct drm_gem_object gobj = { };
+	struct drm_exec exec;
+	int ret;
+
+	drm_gem_private_object_init(&dev, &gobj, PAGE_SIZE);
+
+	drm_exec_init(&exec, DRM_EXEC_INTERRUPTIBLE_WAIT);
+	drm_exec_until_all_locked(&exec) {
+		ret = drm_exec_lock_obj(&exec, &gobj);
+		drm_exec_retry_on_contention(&exec);
+		KUNIT_EXPECT_EQ(test, ret, 0);
+		if (ret)
+			break;
+
+		drm_exec_unlock_obj(&exec, &gobj);
+		ret = drm_exec_lock_obj(&exec, &gobj);
+		drm_exec_retry_on_contention(&exec);
+		KUNIT_EXPECT_EQ(test, ret, 0);
+		if (ret)
+			break;
+	}
+	drm_exec_fini(&exec);
+}
+
+static void test_duplicates(struct kunit *test)
+{
+	struct drm_gem_object gobj = { };
+	struct drm_exec exec;
+	int ret;
+
+	drm_gem_private_object_init(&dev, &gobj, PAGE_SIZE);
+
+	drm_exec_init(&exec, DRM_EXEC_IGNORE_DUPLICATES);
+	drm_exec_until_all_locked(&exec) {
+		ret = drm_exec_lock_obj(&exec, &gobj);
+		drm_exec_retry_on_contention(&exec);
+		KUNIT_EXPECT_EQ(test, ret, 0);
+		if (ret)
+			break;
+
+		ret = drm_exec_lock_obj(&exec, &gobj);
+		drm_exec_retry_on_contention(&exec);
+		KUNIT_EXPECT_EQ(test, ret, 0);
+		if (ret)
+			break;
+	}
+	drm_exec_unlock_obj(&exec, &gobj);
+	drm_exec_fini(&exec);
+}
+
+
+
+static void test_prepare(struct kunit *test)
+{
+	struct drm_gem_object gobj = { };
+	struct drm_exec exec;
+	int ret;
+
+	drm_gem_private_object_init(&dev, &gobj, PAGE_SIZE);
+
+	drm_exec_init(&exec, DRM_EXEC_INTERRUPTIBLE_WAIT);
+	drm_exec_until_all_locked(&exec) {
+		ret = drm_exec_prepare_obj(&exec, &gobj, 1);
+		drm_exec_retry_on_contention(&exec);
+		KUNIT_EXPECT_EQ(test, ret, 0);
+		if (ret)
+			break;
+	}
+	drm_exec_fini(&exec);
+}
+
+static void test_prepare_array(struct kunit *test)
+{
+	struct drm_gem_object gobj1 = { };
+	struct drm_gem_object gobj2 = { };
+	struct drm_gem_object *array[] = { &gobj1, &gobj2 };
+	struct drm_exec exec;
+	int ret;
+
+	drm_gem_private_object_init(&dev, &gobj1, PAGE_SIZE);
+	drm_gem_private_object_init(&dev, &gobj2, PAGE_SIZE);
+
+	drm_exec_init(&exec, DRM_EXEC_INTERRUPTIBLE_WAIT);
+	drm_exec_until_all_locked(&exec)
+		ret = drm_exec_prepare_array(&exec, array, ARRAY_SIZE(array),
+					     1);
+	KUNIT_EXPECT_EQ(test, ret, 0);
+	drm_exec_fini(&exec);
+}
+
+static struct kunit_case drm_exec_tests[] = {
+	KUNIT_CASE(sanitycheck),
+	KUNIT_CASE(test_lock),
+	KUNIT_CASE(test_lock_unlock),
+	KUNIT_CASE(test_duplicates),
+	KUNIT_CASE(test_prepare),
+	KUNIT_CASE(test_prepare_array),
+	{}
+};
+
+static struct kunit_suite drm_exec_test_suite = {
+	.name = "drm_exec",
+	.test_cases = drm_exec_tests,
+};
+
+kunit_test_suite(drm_exec_test_suite);
+
+MODULE_AUTHOR("AMD");
+MODULE_LICENSE("GPL and additional rights");