// SPDX-License-Identifier: GPL-2.0
/*
 * KUnit test for core test infrastructure.
 *
 * Copyright (C) 2019, Google LLC.
 * Author: Brendan Higgins <brendanhiggins@google.com>
 */
#include <kunit/test.h>

#include "try-catch-impl.h"

struct kunit_try_catch_test_context {
        struct kunit_try_catch *try_catch;
        bool function_called;
};

static void kunit_test_successful_try(void *data)
{
        struct kunit *test = data;
        struct kunit_try_catch_test_context *ctx = test->priv;

        ctx->function_called = true;
}

static void kunit_test_no_catch(void *data)
{
        struct kunit *test = data;

        KUNIT_FAIL(test, "Catch should not be called\n");
}

static void kunit_test_try_catch_successful_try_no_catch(struct kunit *test)
{
        struct kunit_try_catch_test_context *ctx = test->priv;
        struct kunit_try_catch *try_catch = ctx->try_catch;

        kunit_try_catch_init(try_catch,
                             test,
                             kunit_test_successful_try,
                             kunit_test_no_catch);
        kunit_try_catch_run(try_catch, test);

        KUNIT_EXPECT_TRUE(test, ctx->function_called);
}

static void kunit_test_unsuccessful_try(void *data)
{
        struct kunit *test = data;
        struct kunit_try_catch_test_context *ctx = test->priv;
        struct kunit_try_catch *try_catch = ctx->try_catch;

        kunit_try_catch_throw(try_catch);
        KUNIT_FAIL(test, "This line should never be reached\n");
}

static void kunit_test_catch(void *data)
{
        struct kunit *test = data;
        struct kunit_try_catch_test_context *ctx = test->priv;

        ctx->function_called = true;
}

static void kunit_test_try_catch_unsuccessful_try_does_catch(struct kunit *test)
{
        struct kunit_try_catch_test_context *ctx = test->priv;
        struct kunit_try_catch *try_catch = ctx->try_catch;

        kunit_try_catch_init(try_catch,
                             test,
                             kunit_test_unsuccessful_try,
                             kunit_test_catch);
        kunit_try_catch_run(try_catch, test);

        KUNIT_EXPECT_TRUE(test, ctx->function_called);
}

static int kunit_try_catch_test_init(struct kunit *test)
{
        struct kunit_try_catch_test_context *ctx;

        ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
        KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
        test->priv = ctx;

        ctx->try_catch = kunit_kmalloc(test,
                                       sizeof(*ctx->try_catch),
                                       GFP_KERNEL);
        KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->try_catch);

        return 0;
}

static struct kunit_case kunit_try_catch_test_cases[] = {
        KUNIT_CASE(kunit_test_try_catch_successful_try_no_catch),
        KUNIT_CASE(kunit_test_try_catch_unsuccessful_try_does_catch),
        {}
};

static struct kunit_suite kunit_try_catch_test_suite = {
        .name = "kunit-try-catch-test",
        .init = kunit_try_catch_test_init,
        .test_cases = kunit_try_catch_test_cases,
};

/*
 * Context for testing test managed resources
 * is_resource_initialized is used to test arbitrary resources
 */
struct kunit_test_resource_context {
        struct kunit test;
        bool is_resource_initialized;
        int allocate_order[2];
        int free_order[2];
};

static int fake_resource_init(struct kunit_resource *res, void *context)
{
        struct kunit_test_resource_context *ctx = context;

        res->data = &ctx->is_resource_initialized;
        ctx->is_resource_initialized = true;
        return 0;
}

static void fake_resource_free(struct kunit_resource *res)
{
        bool *is_resource_initialized = res->data;

        *is_resource_initialized = false;
}

static void kunit_resource_test_init_resources(struct kunit *test)
{
        struct kunit_test_resource_context *ctx = test->priv;

        kunit_init_test(&ctx->test, "testing_test_init_test", NULL);

        KUNIT_EXPECT_TRUE(test, list_empty(&ctx->test.resources));
}

static void kunit_resource_test_alloc_resource(struct kunit *test)
{
        struct kunit_test_resource_context *ctx = test->priv;
        struct kunit_resource *res;
        kunit_resource_free_t free = fake_resource_free;

        res = kunit_alloc_and_get_resource(&ctx->test,
                                           fake_resource_init,
                                           fake_resource_free,
                                           GFP_KERNEL,
                                           ctx);

        KUNIT_ASSERT_NOT_ERR_OR_NULL(test, res);
        KUNIT_EXPECT_PTR_EQ(test,
                            &ctx->is_resource_initialized,
                            (bool *)res->data);
        KUNIT_EXPECT_TRUE(test, list_is_last(&res->node, &ctx->test.resources));
        KUNIT_EXPECT_PTR_EQ(test, free, res->free);

        kunit_put_resource(res);
}

/*
 * Note: tests below use kunit_alloc_and_get_resource(), so as a consequence
 * they have a reference to the associated resource that they must release
 * via kunit_put_resource().  In normal operation, users will only
 * have to do this for cases where they use kunit_find_resource(), and the
 * kunit_alloc_resource() function will be used (which does not take a
 * resource reference).
 */
static void kunit_resource_test_destroy_resource(struct kunit *test)
{
        struct kunit_test_resource_context *ctx = test->priv;
        struct kunit_resource *res = kunit_alloc_and_get_resource(
                        &ctx->test,
                        fake_resource_init,
                        fake_resource_free,
                        GFP_KERNEL,
                        ctx);

        kunit_put_resource(res);

        KUNIT_ASSERT_FALSE(test,
                           kunit_destroy_resource(&ctx->test,
                                                  kunit_resource_instance_match,
                                                  res->data));

        KUNIT_EXPECT_FALSE(test, ctx->is_resource_initialized);
        KUNIT_EXPECT_TRUE(test, list_empty(&ctx->test.resources));
}

static void kunit_resource_test_cleanup_resources(struct kunit *test)
{
        int i;
        struct kunit_test_resource_context *ctx = test->priv;
        struct kunit_resource *resources[5];

        for (i = 0; i < ARRAY_SIZE(resources); i++) {
                resources[i] = kunit_alloc_and_get_resource(&ctx->test,
                                                            fake_resource_init,
                                                            fake_resource_free,
                                                            GFP_KERNEL,
                                                            ctx);
                kunit_put_resource(resources[i]);
        }

        kunit_cleanup(&ctx->test);

        KUNIT_EXPECT_TRUE(test, list_empty(&ctx->test.resources));
}

static void kunit_resource_test_mark_order(int order_array[],
                                           size_t order_size,
                                           int key)
{
        int i;

        for (i = 0; i < order_size && order_array[i]; i++)
                ;

        order_array[i] = key;
}

#define KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, order_field, key)                  \
                kunit_resource_test_mark_order(ctx->order_field,               \
                                               ARRAY_SIZE(ctx->order_field),   \
                                               key)

static int fake_resource_2_init(struct kunit_resource *res, void *context)
{
        struct kunit_test_resource_context *ctx = context;

        KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, allocate_order, 2);

        res->data = ctx;

        return 0;
}

static void fake_resource_2_free(struct kunit_resource *res)
{
        struct kunit_test_resource_context *ctx = res->data;

        KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, free_order, 2);
}

static int fake_resource_1_init(struct kunit_resource *res, void *context)
{
        struct kunit_test_resource_context *ctx = context;
        struct kunit_resource *res2;

        res2 = kunit_alloc_and_get_resource(&ctx->test,
                                            fake_resource_2_init,
                                            fake_resource_2_free,
                                            GFP_KERNEL,
                                            ctx);

        KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, allocate_order, 1);

        res->data = ctx;

        kunit_put_resource(res2);

        return 0;
}

static void fake_resource_1_free(struct kunit_resource *res)
{
        struct kunit_test_resource_context *ctx = res->data;

        KUNIT_RESOURCE_TEST_MARK_ORDER(ctx, free_order, 1);
}

/*
 * TODO(brendanhiggins@google.com): replace the arrays that keep track of the
 * order of allocation and freeing with strict mocks using the IN_SEQUENCE macro
 * to assert allocation and freeing order when the feature becomes available.
 */
static void kunit_resource_test_proper_free_ordering(struct kunit *test)
{
        struct kunit_test_resource_context *ctx = test->priv;
        struct kunit_resource *res;

        /* fake_resource_1 allocates a fake_resource_2 in its init. */
        res = kunit_alloc_and_get_resource(&ctx->test,
                                           fake_resource_1_init,
                                           fake_resource_1_free,
                                           GFP_KERNEL,
                                           ctx);

        /*
         * Since fake_resource_2_init calls KUNIT_RESOURCE_TEST_MARK_ORDER
         * before returning to fake_resource_1_init, it should be the first to
         * put its key in the allocate_order array.
         */
        KUNIT_EXPECT_EQ(test, ctx->allocate_order[0], 2);
        KUNIT_EXPECT_EQ(test, ctx->allocate_order[1], 1);

        kunit_put_resource(res);

        kunit_cleanup(&ctx->test);

        /*
         * Because fake_resource_2 finishes allocation before fake_resource_1,
         * fake_resource_1 should be freed first since it could depend on
         * fake_resource_2.
         */
        KUNIT_EXPECT_EQ(test, ctx->free_order[0], 1);
        KUNIT_EXPECT_EQ(test, ctx->free_order[1], 2);
}

static void kunit_resource_test_static(struct kunit *test)
{
        struct kunit_test_resource_context ctx;
        struct kunit_resource res;

        KUNIT_EXPECT_EQ(test, kunit_add_resource(test, NULL, NULL, &res, &ctx),
                        0);

        KUNIT_EXPECT_PTR_EQ(test, res.data, (void *)&ctx);

        kunit_cleanup(test);

        KUNIT_EXPECT_TRUE(test, list_empty(&test->resources));
}

static void kunit_resource_test_named(struct kunit *test)
{
        struct kunit_resource res1, res2, *found = NULL;
        struct kunit_test_resource_context ctx;

        KUNIT_EXPECT_EQ(test,
                        kunit_add_named_resource(test, NULL, NULL, &res1,
                                                 "resource_1", &ctx),
                        0);
        KUNIT_EXPECT_PTR_EQ(test, res1.data, (void *)&ctx);

        KUNIT_EXPECT_EQ(test,
                        kunit_add_named_resource(test, NULL, NULL, &res1,
                                                 "resource_1", &ctx),
                        -EEXIST);

        KUNIT_EXPECT_EQ(test,
                        kunit_add_named_resource(test, NULL, NULL, &res2,
                                                 "resource_2", &ctx),
                        0);

        found = kunit_find_named_resource(test, "resource_1");

        KUNIT_EXPECT_PTR_EQ(test, found, &res1);

        if (found)
                kunit_put_resource(&res1);

        KUNIT_EXPECT_EQ(test, kunit_destroy_named_resource(test, "resource_2"),
                        0);

        kunit_cleanup(test);

        KUNIT_EXPECT_TRUE(test, list_empty(&test->resources));
}

static int kunit_resource_test_init(struct kunit *test)
{
        struct kunit_test_resource_context *ctx =
                        kzalloc(sizeof(*ctx), GFP_KERNEL);

        KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);

        test->priv = ctx;

        kunit_init_test(&ctx->test, "test_test_context", NULL);

        return 0;
}

static void kunit_resource_test_exit(struct kunit *test)
{
        struct kunit_test_resource_context *ctx = test->priv;

        kunit_cleanup(&ctx->test);
        kfree(ctx);
}

static struct kunit_case kunit_resource_test_cases[] = {
        KUNIT_CASE(kunit_resource_test_init_resources),
        KUNIT_CASE(kunit_resource_test_alloc_resource),
        KUNIT_CASE(kunit_resource_test_destroy_resource),
        KUNIT_CASE(kunit_resource_test_cleanup_resources),
        KUNIT_CASE(kunit_resource_test_proper_free_ordering),
        KUNIT_CASE(kunit_resource_test_static),
        KUNIT_CASE(kunit_resource_test_named),
        {}
};

static struct kunit_suite kunit_resource_test_suite = {
        .name = "kunit-resource-test",
        .init = kunit_resource_test_init,
        .exit = kunit_resource_test_exit,
        .test_cases = kunit_resource_test_cases,
};

static void kunit_log_test(struct kunit *test);

static struct kunit_case kunit_log_test_cases[] = {
        KUNIT_CASE(kunit_log_test),
        {}
};

static struct kunit_suite kunit_log_test_suite = {
        .name = "kunit-log-test",
        .test_cases = kunit_log_test_cases,
};

static void kunit_log_test(struct kunit *test)
{
        struct kunit_suite *suite = &kunit_log_test_suite;

        kunit_log(KERN_INFO, test, "put this in log.");
        kunit_log(KERN_INFO, test, "this too.");
        kunit_log(KERN_INFO, suite, "add to suite log.");
        kunit_log(KERN_INFO, suite, "along with this.");

#ifdef CONFIG_KUNIT_DEBUGFS
        KUNIT_EXPECT_NOT_ERR_OR_NULL(test,
                                     strstr(test->log, "put this in log."));
        KUNIT_EXPECT_NOT_ERR_OR_NULL(test,
                                     strstr(test->log, "this too."));
        KUNIT_EXPECT_NOT_ERR_OR_NULL(test,
                                     strstr(suite->log, "add to suite log."));
        KUNIT_EXPECT_NOT_ERR_OR_NULL(test,
                                     strstr(suite->log, "along with this."));
#else
        KUNIT_EXPECT_PTR_EQ(test, test->log, (char *)NULL);
        KUNIT_EXPECT_PTR_EQ(test, suite->log, (char *)NULL);
#endif
}

kunit_test_suites(&kunit_try_catch_test_suite, &kunit_resource_test_suite,
                  &kunit_log_test_suite);

MODULE_LICENSE("GPL v2");