1 files changed, 73 insertions, 0 deletions
diff --git a/drivers/gpu/drm/imagination/pvr_test.c b/drivers/gpu/drm/imagination/pvr_test.c
new file mode 100644
index 000000000000..506cfa5a02f1
--- /dev/null
+++ b/drivers/gpu/drm/imagination/pvr_test.c
@@ -0,0 +1,73 @@
+// SPDX-License-Identifier: GPL-2.0-only OR MIT
+/* Copyright (c) 2025 Imagination Technologies Ltd. */
+
+#include "pvr_device.h"
+
+#include <linux/errno.h>
+#include <linux/stddef.h>
+#include <linux/string.h>
+#include <linux/types.h>
+
+#include <kunit/test.h>
+#include <kunit/visibility.h>
+
+static void decode_gpuid_string(struct kunit *test)
+{
+	const struct pvr_gpu_id bad_gpuid = { 0xdead, 0xbeef, 0xcafe, 0xface };
+	const u64 packed_bad_gpuid = pvr_gpu_id_to_packed_bvnc(&bad_gpuid);
+
+#define GPUID_TEST_CASE(str_, err_, value_)					\
+	do {									\
+		struct pvr_gpu_id _gpuid_out = bad_gpuid;			\
+		int _err;							\
+		_err = pvr_gpuid_decode_string(NULL, str_, &_gpuid_out);	\
+		KUNIT_EXPECT_EQ(test, _err, err_);				\
+		KUNIT_EXPECT_EQ(test,						\
+				pvr_gpu_id_to_packed_bvnc(&_gpuid_out),		\
+				value_);					\
+	} while (0)
+
+#define GPUID_TEST_CASE_OK(str_, b_, v_, n_, c_) \
+	GPUID_TEST_CASE(str_, 0, PVR_PACKED_BVNC(b_, v_, n_, c_))
+
+#define GPUID_TEST_CASE_INVAL(str_) \
+	GPUID_TEST_CASE(str_, -EINVAL, packed_bad_gpuid)
+
+	GPUID_TEST_CASE_OK("12.34.56.78", 12, 34, 56, 78);
+	GPUID_TEST_CASE_OK("0.0.0.0", 0, 0, 0, 0);
+
+	GPUID_TEST_CASE_INVAL("");
+	GPUID_TEST_CASE_INVAL("42.foobar-invalid.gpuid.bvnc");
+
+	/* String longer than PVR_GPUID_STRING_MAX_LENGTH. */
+	GPUID_TEST_CASE_INVAL("12.34.56.789012345678901234567890123456");
+
+	/* Single value overflowing u16. */
+	GPUID_TEST_CASE_INVAL("12.34.56.999999");
+
+	/* Wrong number of parts and/or dots. */
+	GPUID_TEST_CASE_INVAL("12.34.56.78.90");
+	GPUID_TEST_CASE_INVAL("12.34.56..78");
+	GPUID_TEST_CASE_INVAL("12.34..56");
+	GPUID_TEST_CASE_INVAL("12.34.56");
+
+#undef GPUID_TEST_CASE_INVAL
+#undef GPUID_TEST_CASE_OK
+#undef GPUID_TEST_CASE
+}
+
+static struct kunit_case pvr_tests_cases[] = {
+	KUNIT_CASE(decode_gpuid_string),
+	{},
+};
+
+static struct kunit_suite pvr_tests_suite = {
+	.name = "pvr_tests",
+	.test_cases = pvr_tests_cases,
+};
+kunit_test_suite(pvr_tests_suite);
+
+MODULE_AUTHOR("Imagination Technologies Ltd.");
+MODULE_LICENSE("Dual MIT/GPL");
+MODULE_DESCRIPTION("pvr kunit tests");
+MODULE_IMPORT_NS("EXPORTED_FOR_KUNIT_TESTING");