gpu: nvgpu: add unit tests for utils unit

Add unit tests for posix utils unit.

Jira NVGPU-4478

Change-Id: I426e2b8cc7ed508f4e66db3796ab21eb3ce3e85f
Signed-off-by: ajesh <akv@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvgpu/+/2282760
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>

userspace/units/posix/utils/posix-utils.c

@@ -0,0 +1,172 @@
+/*
+ * 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 <stdint.h>
+
+#include <unit/io.h>
+#include <unit/unit.h>
+
+#include <nvgpu/utils.h>
+
+#include "posix-utils.h"
+
+/*
+ * Test to ensure the EXPECT_BUG construct works as intended by making sure it
+ * behaves properly when BUG is called or not.
+ * In the event that EXPECT_BUG is completely broken, the call to BUG() would
+ * cause the unit to crash and report a failure correctly.
+ */
+int test_hamming_weight(struct unit_module *m,
+				struct gk20a *g, void *args)
+{
+	unsigned int result;
+	unsigned int i;
+	uint8_t hwt_8bit;
+	uint16_t hwt_16bit;
+	uint32_t hwt_32bit;
+	uint64_t hwt_64bit;
+
+	for (i = 0; i < 8; i++) {
+		hwt_8bit = (unsigned int) 1 << i;
+		result = nvgpu_posix_hweight8(hwt_8bit);
+		if (result != 1) {
+			unit_return_fail(m,
+				"8 bit hwt failed for %d\n", hwt_8bit);
+		}
+	}
+
+	for (i = 0; i < 16; i++) {
+		hwt_16bit = (unsigned int) 1 << i;
+		result = nvgpu_posix_hweight16(hwt_16bit);
+		if (result != 1) {
+			unit_return_fail(m,
+				"16 bit hwt failed for %d\n", hwt_16bit);
+		}
+	}
+
+	for (i = 0; i < 32; i++) {
+		hwt_32bit = (unsigned int) 1 << i;
+		result = nvgpu_posix_hweight32(hwt_32bit);
+		if (result != 1) {
+			unit_return_fail(m,
+				"32 bit hwt failed for %d\n", hwt_32bit);
+		}
+	}
+
+	for (i = 0; i < 64; i++) {
+		hwt_64bit = (unsigned long) 1 << i;
+		result = nvgpu_posix_hweight64(hwt_64bit);
+		if (result != 1) {
+			unit_return_fail(m,
+				"64 bit hwt failed for %lx\n", hwt_64bit);
+		}
+	}
+
+	hwt_8bit = 0x0;
+	result = nvgpu_posix_hweight8(hwt_8bit);
+	if (result != 0) {
+		unit_return_fail(m,
+			"8 bit hwt failed for %d\n", hwt_8bit);
+	}
+
+	hwt_8bit = 0xff;
+	result = nvgpu_posix_hweight8(hwt_8bit);
+	if (result != 8) {
+		unit_return_fail(m,
+			"8 bit hwt failed for %d\n", hwt_8bit);
+	}
+
+	hwt_16bit = 0x0;
+	result = nvgpu_posix_hweight16(hwt_16bit);
+	if (result != 0) {
+		unit_return_fail(m,
+			"16 bit hwt failed for %d\n", hwt_16bit);
+	}
+
+	hwt_16bit = 0xffff;
+	result = nvgpu_posix_hweight16(hwt_16bit);
+	if (result != 16) {
+		unit_return_fail(m,
+			"16 bit hwt failed for %d\n", hwt_16bit);
+	}
+
+	hwt_32bit = 0x0;
+	result = nvgpu_posix_hweight32(hwt_32bit);
+	if (result != 0) {
+		unit_return_fail(m,
+			"32 bit hwt failed for %d\n", hwt_32bit);
+	}
+
+	hwt_32bit = 0xffffffff;
+	result = nvgpu_posix_hweight32(hwt_32bit);
+	if (result != 32) {
+		unit_return_fail(m,
+			"32 bit hwt failed for %d\n", hwt_32bit);
+	}
+
+	hwt_64bit = 0x0;
+	result = nvgpu_posix_hweight64(hwt_64bit);
+	if (result != 0) {
+		unit_return_fail(m,
+			"64 bit hwt failed for %ld\n", hwt_64bit);
+	}
+
+	hwt_64bit = 0xffffffffffffffff;
+	result = nvgpu_posix_hweight64(hwt_64bit);
+	if (result != 64) {
+		unit_return_fail(m,
+			"64 bit hwt failed for %ld\n", hwt_64bit);
+	}
+
+	return UNIT_SUCCESS;
+}
+
+int test_be32tocpu(struct unit_module *m,
+			struct gk20a *g, void *args)
+{
+	uint32_t pattern;
+	uint32_t result;
+	uint8_t *ptr;
+
+	pattern = 0xaabbccdd;
+
+	ptr = (uint8_t*)&pattern;
+
+	result = be32_to_cpu(pattern);
+
+	if (*ptr == 0xdd) {
+		if (result != 0xddccbbaa) {
+			unit_return_fail(m,
+				"be32tocpu failed for %x %x\n",
+				pattern, result);
+		}
+	}
+
+	return UNIT_SUCCESS;
+}
+struct unit_module_test posix_utils_tests[] = {
+	UNIT_TEST(hweight_test, test_hamming_weight, NULL, 0),
+	UNIT_TEST(be32tocpu_test, test_be32tocpu, NULL, 0),
+};
+
+UNIT_MODULE(posix_utils, posix_utils_tests, UNIT_PRIO_POSIX_TEST);