// SPDX-License-Identifier: GPL-2.0-only
#include <kunit/test.h>
#include <linux/int_log.h>

struct test_case_params {
        u32 value;
        unsigned int expected_result;
        const char *name;
};


/* The expected result takes into account the log error */
static const struct test_case_params intlog2_params[] = {
        {0, 0, "Log base 2 of 0"},
        {1, 0, "Log base 2 of 1"},
        {2, 16777216, "Log base 2 of 2"},
        {3, 26591232, "Log base 2 of 3"},
        {4, 33554432, "Log base 2 of 4"},
        {8, 50331648, "Log base 2 of 8"},
        {16, 67108864, "Log base 2 of 16"},
        {32, 83886080, "Log base 2 of 32"},
        {U32_MAX, 536870911, "Log base 2 of MAX"},
};

static const struct test_case_params intlog10_params[] = {
        {0, 0, "Log base 10 of 0"},
        {1, 0, "Log base 10 of 1"},
        {6, 13055203, "Log base 10 of 6"},
        {10, 16777225, "Log base 10 of 10"},
        {100, 33554450, "Log base 10 of 100"},
        {1000, 50331675, "Log base 10 of 1000"},
        {10000, 67108862, "Log base 10 of 10000"},
        {U32_MAX, 161614247, "Log base 10 of MAX"}
};

static void get_desc(const struct test_case_params *tc, char *desc)
{
        strscpy(desc, tc->name, KUNIT_PARAM_DESC_SIZE);
}


KUNIT_ARRAY_PARAM(intlog2, intlog2_params, get_desc);

static void intlog2_test(struct kunit *test)
{
        const struct test_case_params *tc = (const struct test_case_params *)test->param_value;

        KUNIT_EXPECT_EQ(test, tc->expected_result, intlog2(tc->value));
}

KUNIT_ARRAY_PARAM(intlog10, intlog10_params, get_desc);

static void intlog10_test(struct kunit *test)
{
        const struct test_case_params *tc = (const struct test_case_params *)test->param_value;

        KUNIT_EXPECT_EQ(test, tc->expected_result, intlog10(tc->value));
}

static struct kunit_case math_int_log_test_cases[] = {
        KUNIT_CASE_PARAM(intlog2_test, intlog2_gen_params),
        KUNIT_CASE_PARAM(intlog10_test, intlog10_gen_params),
        {}
};

static struct kunit_suite int_log_test_suite = {
        .name = "math-int_log",
        .test_cases =  math_int_log_test_cases,
};

kunit_test_suites(&int_log_test_suite);

MODULE_DESCRIPTION("math.int_log KUnit test suite");
MODULE_LICENSE("GPL");