drm/xe/kunit: Add simple tests for new xe_args macros

We want to make sure that helper macros are working as expected.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240502223313.2527-3-michal.wajdeczko@intel.com

drivers/gpu/drm/xe/tests/Makefile

@@ -11,6 +11,7 @@ xe_live_test-y = xe_live_test_mod.o \
 # Normal kunit tests
 obj-$(CONFIG_DRM_XE_KUNIT_TEST) += xe_test.o
 xe_test-y = xe_test_mod.o \
+	xe_args_test.o \
 	xe_pci_test.o \
 	xe_rtp_test.o \
 	xe_wa_test.o

drivers/gpu/drm/xe/tests/xe_args_test.c

+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+#include <kunit/test.h>
+
+#include "xe_args.h"
+
+static void call_args_example(struct kunit *test)
+{
+#define foo	X, Y, Z, Q
+#define bar	COUNT_ARGS(foo)
+#define buz	CALL_ARGS(COUNT_ARGS, foo)
+
+	KUNIT_EXPECT_EQ(test, bar, 1);
+	KUNIT_EXPECT_EQ(test, buz, 4);
+
+#undef foo
+#undef bar
+#undef buz
+}
+
+static void drop_first_example(struct kunit *test)
+{
+#define foo	X, Y, Z, Q
+#define bar	CALL_ARGS(COUNT_ARGS, DROP_FIRST(foo))
+
+	KUNIT_EXPECT_EQ(test, bar, 3);
+
+#undef foo
+#undef bar
+}
+
+static void pick_first_example(struct kunit *test)
+{
+	int X = 1;
+
+#define foo	X, Y, Z, Q
+#define bar	PICK_FIRST(foo)
+
+	KUNIT_EXPECT_EQ(test, bar, X);
+	KUNIT_EXPECT_STREQ(test, __stringify(bar), "X");
+
+#undef foo
+#undef bar
+}
+
+static void pick_last_example(struct kunit *test)
+{
+	int Q = 1;
+
+#define foo	X, Y, Z, Q
+#define bar	PICK_LAST(foo)
+
+	KUNIT_EXPECT_EQ(test, bar, Q);
+	KUNIT_EXPECT_STREQ(test, __stringify(bar), "Q");
+
+#undef foo
+#undef bar
+}
+
+static void sep_comma_example(struct kunit *test)
+{
+#define foo(f)	f(X) f(Y) f(Z) f(Q)
+#define bar	DROP_FIRST(foo(ARGS_SEP_COMMA __stringify))
+#define buz	CALL_ARGS(COUNT_ARGS, DROP_FIRST(foo(ARGS_SEP_COMMA)))
+
+	static const char * const a[] = { bar };
+
+	KUNIT_EXPECT_STREQ(test, a[0], "X");
+	KUNIT_EXPECT_STREQ(test, a[1], "Y");
+	KUNIT_EXPECT_STREQ(test, a[2], "Z");
+	KUNIT_EXPECT_STREQ(test, a[3], "Q");
+
+	KUNIT_EXPECT_EQ(test, buz, 4);
+
+#undef foo
+#undef bar
+#undef buz
+}
+
+#define NO_ARGS
+#define FOO_ARGS	X, Y, Z, Q
+#define MAX_ARGS	-1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12
+
+static void count_args_test(struct kunit *test)
+{
+	int count;
+
+	/* COUNT_ARGS() counts to 12 */
+
+	count = COUNT_ARGS();
+	KUNIT_EXPECT_EQ(test, count, 0);
+
+	count = COUNT_ARGS(1);
+	KUNIT_EXPECT_EQ(test, count, 1);
+
+	count = COUNT_ARGS(a, b, c, d, e);
+	KUNIT_EXPECT_EQ(test, count, 5);
+
+	count = COUNT_ARGS(a, b, c, d, e, f, g, h, i, j, k, l);
+	KUNIT_EXPECT_EQ(test, count, 12);
+
+	/* COUNT_ARGS() does not expand params */
+
+	count = COUNT_ARGS(NO_ARGS);
+	KUNIT_EXPECT_EQ(test, count, 1);
+
+	count = COUNT_ARGS(FOO_ARGS);
+	KUNIT_EXPECT_EQ(test, count, 1);
+}
+
+static void call_args_test(struct kunit *test)
+{
+	int count;
+
+	count = CALL_ARGS(COUNT_ARGS, NO_ARGS);
+	KUNIT_EXPECT_EQ(test, count, 0);
+	KUNIT_EXPECT_EQ(test, CALL_ARGS(COUNT_ARGS, NO_ARGS), 0);
+	KUNIT_EXPECT_EQ(test, CALL_ARGS(COUNT_ARGS, FOO_ARGS), 4);
+	KUNIT_EXPECT_EQ(test, CALL_ARGS(COUNT_ARGS, FOO_ARGS, FOO_ARGS), 8);
+	KUNIT_EXPECT_EQ(test, CALL_ARGS(COUNT_ARGS, MAX_ARGS), 12);
+}
+
+static void drop_first_test(struct kunit *test)
+{
+	int Y = -2, Z = -3, Q = -4;
+	int a[] = { DROP_FIRST(FOO_ARGS) };
+
+	KUNIT_EXPECT_EQ(test, DROP_FIRST(0, -1), -1);
+	KUNIT_EXPECT_EQ(test, DROP_FIRST(DROP_FIRST(0, -1, -2)), -2);
+
+	KUNIT_EXPECT_EQ(test, CALL_ARGS(COUNT_ARGS, DROP_FIRST(FOO_ARGS)), 3);
+	KUNIT_EXPECT_EQ(test, DROP_FIRST(DROP_FIRST(DROP_FIRST(FOO_ARGS))), -4);
+	KUNIT_EXPECT_EQ(test, a[0], -2);
+	KUNIT_EXPECT_EQ(test, a[1], -3);
+	KUNIT_EXPECT_EQ(test, a[2], -4);
+	KUNIT_EXPECT_STREQ(test, __stringify(DROP_FIRST(DROP_FIRST(DROP_FIRST(FOO_ARGS)))), "Q");
+}
+
+static void pick_first_test(struct kunit *test)
+{
+	int X = -1;
+	int a[] = { PICK_FIRST(FOO_ARGS) };
+
+	KUNIT_EXPECT_EQ(test, PICK_FIRST(-1, -2), -1);
+
+	KUNIT_EXPECT_EQ(test, CALL_ARGS(COUNT_ARGS, PICK_FIRST(FOO_ARGS)), 1);
+	KUNIT_EXPECT_EQ(test, PICK_FIRST(FOO_ARGS), -1);
+	KUNIT_EXPECT_EQ(test, a[0], -1);
+	KUNIT_EXPECT_STREQ(test, __stringify(PICK_FIRST(FOO_ARGS)), "X");
+}
+
+static void pick_last_test(struct kunit *test)
+{
+	int Q = -4;
+	int a[] = { PICK_LAST(FOO_ARGS) };
+
+	KUNIT_EXPECT_EQ(test, PICK_LAST(-1, -2), -2);
+
+	KUNIT_EXPECT_EQ(test, CALL_ARGS(COUNT_ARGS, PICK_LAST(FOO_ARGS)), 1);
+	KUNIT_EXPECT_EQ(test, PICK_LAST(FOO_ARGS), -4);
+	KUNIT_EXPECT_EQ(test, a[0], -4);
+	KUNIT_EXPECT_STREQ(test, __stringify(PICK_LAST(FOO_ARGS)), "Q");
+
+	KUNIT_EXPECT_EQ(test, PICK_LAST(MAX_ARGS), -12);
+	KUNIT_EXPECT_STREQ(test, __stringify(PICK_LAST(MAX_ARGS)), "-12");
+}
+
+static struct kunit_case args_tests[] = {
+	KUNIT_CASE(count_args_test),
+	KUNIT_CASE(call_args_example),
+	KUNIT_CASE(call_args_test),
+	KUNIT_CASE(drop_first_example),
+	KUNIT_CASE(drop_first_test),
+	KUNIT_CASE(pick_first_example),
+	KUNIT_CASE(pick_first_test),
+	KUNIT_CASE(pick_last_example),
+	KUNIT_CASE(pick_last_test),
+	KUNIT_CASE(sep_comma_example),
+	{}
+};
+
+static struct kunit_suite args_test_suite = {
+	.name = "args",
+	.test_cases = args_tests,
+};
+
+kunit_test_suite(args_test_suite);