gpu: nvgpu: add tests for kref

Add unit tests for kref unit.

Jira NVGPU-4417

Change-Id: Ie5c6efc72b95aa1f200a59fd9184f20e65548fee
Signed-off-by: ajesh <akv@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2287553
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>

userspace/units/interface/kref/kref.c

@@ -0,0 +1,210 @@
+/*
+ * Copyright (c) 2020, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include <stdlib.h>
+
+#include <unit/io.h>
+#include <unit/unit.h>
+
+#include <nvgpu/kref.h>
+
+#include "kref.h"
+
+#define LOOP_COUNT 10
+
+int release_count = 0;
+
+static void test_ref_release(struct nvgpu_ref *ref)
+{
+	release_count += 1;
+}
+
+int test_kref_init(struct unit_module *m, struct gk20a *g, void *args)
+{
+	int ret = 0;
+	struct nvgpu_ref test_ref;
+
+	nvgpu_ref_init(&test_ref);
+
+	ret = nvgpu_atomic_read(&test_ref.refcount);
+
+	if (ret != 1) {
+		unit_return_fail(m, "nvgpu_ref_init failure\n");
+	}
+
+	return UNIT_SUCCESS;
+}
+
+int test_kref_get(struct unit_module *m, struct gk20a *g, void *args)
+{
+	int ret, loop;
+	struct nvgpu_ref test_ref;
+
+	nvgpu_ref_init(&test_ref);
+
+	for (loop = 1; loop < LOOP_COUNT; loop++) {
+		nvgpu_ref_get(&test_ref);
+	}
+
+	ret = nvgpu_atomic_read(&test_ref.refcount);
+
+	if (ret != LOOP_COUNT) {
+		unit_return_fail(m, "nvgpu_ref_get failure %d\n", ret);
+	}
+
+	return UNIT_SUCCESS;
+}
+
+int test_kref_get_unless(struct unit_module *m, struct gk20a *g, void *args)
+{
+	int ret;
+	struct nvgpu_ref test_ref;
+
+	nvgpu_atomic_set(&test_ref.refcount, 0);
+	ret = nvgpu_atomic_read(&test_ref.refcount);
+	if (ret != 0)  {
+		unit_return_fail(m, "nvgpu_ref set to 0 failure %d\n", ret);
+	}
+
+	ret = nvgpu_ref_get_unless_zero(&test_ref);
+	if (ret) {
+		unit_return_fail(m,
+			"nvgpu_ref_get_unless_zero failure %d\n", ret);
+	}
+
+	nvgpu_ref_init(&test_ref);
+	ret = nvgpu_ref_get_unless_zero(&test_ref);
+	if (!ret) {
+		unit_return_fail(m,
+			"nvgpu_ref_get_unless_zero failure\n");
+	}
+
+	return UNIT_SUCCESS;
+}
+
+int test_kref_put(struct unit_module *m, struct gk20a *g, void *args)
+{
+	int ret, loop;
+	struct nvgpu_ref test_ref;
+
+	release_count = 0;
+	nvgpu_ref_init(&test_ref);
+
+	for (loop = 1; loop < LOOP_COUNT; loop++) {
+		nvgpu_ref_get(&test_ref);
+	}
+
+	ret = nvgpu_atomic_read(&test_ref.refcount);
+
+	if (ret != LOOP_COUNT) {
+		unit_return_fail(m, "nvgpu_ref_get failure %d\n", ret);
+	}
+
+	for (loop = 0; loop < LOOP_COUNT; loop++) {
+		nvgpu_ref_put(&test_ref, test_ref_release);
+	}
+
+	if (!release_count) {
+		unit_return_fail(m,
+			"release function not invoked\n");
+	} else if ((release_count > 1)) {
+		unit_return_fail(m,
+			"release function invoked more than once\n");
+	}
+
+	nvgpu_ref_get(&test_ref);
+
+	nvgpu_ref_put(&test_ref, NULL);
+
+	ret = nvgpu_atomic_read(&test_ref.refcount);
+	if (ret) {
+		unit_return_fail(m,
+			"nvgpu_ref_put with NULL callback failure %d\n", ret);
+	}
+
+	release_count = 0;
+
+	return UNIT_SUCCESS;
+}
+
+int test_kref_put_return(struct unit_module *m, struct gk20a *g, void *args)
+{
+	int ret, loop;
+	struct nvgpu_ref test_ref;
+
+	release_count = 0;
+	nvgpu_ref_init(&test_ref);
+
+	for (loop = 1; loop < LOOP_COUNT; loop++) {
+		nvgpu_ref_get(&test_ref);
+	}
+
+	ret = nvgpu_atomic_read(&test_ref.refcount);
+
+	if (ret != LOOP_COUNT) {
+		unit_return_fail(m, "refcount not updated%d\n", ret);
+	}
+
+	for (loop = 0; loop < (LOOP_COUNT - 1); loop++) {
+		ret = nvgpu_ref_put_return(&test_ref, test_ref_release);
+		if (ret) {
+			unit_return_fail(m,
+				"nvgpu_ref_put_return failure\n");
+		}
+	}
+
+	ret = nvgpu_ref_put_return(&test_ref, test_ref_release);
+	if (!ret) {
+			unit_return_fail(m,
+				"nvgpu_ref_put_return failure\n");
+	}
+
+	if (!release_count) {
+		unit_return_fail(m,
+			"release function not invoked\n");
+	} else if ((release_count > 1)) {
+		unit_return_fail(m,
+			"release function invoked more than once\n");
+	}
+
+	release_count = 0;
+
+	nvgpu_ref_get(&test_ref);
+
+	ret = nvgpu_ref_put_return(&test_ref, NULL);
+	if (!ret) {
+		unit_return_fail(m,
+			"nvgpu_ref_put_return with NULL callback failure\n");
+	}
+
+	return UNIT_SUCCESS;
+}
+
+struct unit_module_test interface_kref_tests[] = {
+	UNIT_TEST(kref_init,       test_kref_init, NULL, 0),
+	UNIT_TEST(kref_get,        test_kref_get, NULL, 0),
+	UNIT_TEST(kref_get_unless, test_kref_get_unless, NULL, 0),
+	UNIT_TEST(kref_put,        test_kref_put, NULL, 0),
+	UNIT_TEST(kref_put_return, test_kref_put_return, NULL, 0),
+};
+
+UNIT_MODULE(interface_kref, interface_kref_tests, UNIT_PRIO_NVGPU_TEST);