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// SPDX-License-Identifier: GPL-2.0
/*
* KUnit test for the FPGA Bridge
*
* Copyright (C) 2023 Red Hat, Inc.
*
* Author: Marco Pagani <marpagan@redhat.com>
*/
#include <kunit/device.h>
#include <kunit/test.h>
#include <linux/fpga/fpga-bridge.h>
#include <linux/module.h>
#include <linux/types.h>
struct bridge_stats {
bool enable;
};
struct bridge_ctx {
struct fpga_bridge *bridge;
struct device *dev;
struct bridge_stats stats;
};
/*
* Wrapper to avoid a cast warning when passing the action function directly
* to kunit_add_action().
*/
KUNIT_DEFINE_ACTION_WRAPPER(fpga_bridge_unregister_wrapper, fpga_bridge_unregister,
struct fpga_bridge *);
static int op_enable_set(struct fpga_bridge *bridge, bool enable)
{
struct bridge_stats *stats = bridge->priv;
stats->enable = enable;
return 0;
}
/*
* Fake FPGA bridge that implements only the enable_set op to track
* the state.
*/
static const struct fpga_bridge_ops fake_bridge_ops = {
.enable_set = op_enable_set,
};
/**
* register_test_bridge() - Register a fake FPGA bridge for testing.
* @test: KUnit test context object.
* @dev_name: name of the kunit device to be registered
*
* Return: Context of the newly registered FPGA bridge.
*/
static struct bridge_ctx *register_test_bridge(struct kunit *test, const char *dev_name)
{
struct bridge_ctx *ctx;
int ret;
ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
ctx->dev = kunit_device_register(test, dev_name);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->dev);
ctx->bridge = fpga_bridge_register(ctx->dev, "Fake FPGA bridge", &fake_bridge_ops,
&ctx->stats);
KUNIT_ASSERT_FALSE(test, IS_ERR_OR_NULL(ctx->bridge));
ret = kunit_add_action_or_reset(test, fpga_bridge_unregister_wrapper, ctx->bridge);
KUNIT_ASSERT_EQ(test, ret, 0);
return ctx;
}
static void fpga_bridge_test_get(struct kunit *test)
{
struct bridge_ctx *ctx = test->priv;
struct fpga_bridge *bridge;
bridge = fpga_bridge_get(ctx->dev, NULL);
KUNIT_EXPECT_PTR_EQ(test, bridge, ctx->bridge);
bridge = fpga_bridge_get(ctx->dev, NULL);
KUNIT_EXPECT_EQ(test, PTR_ERR(bridge), -EBUSY);
fpga_bridge_put(ctx->bridge);
}
static void fpga_bridge_test_toggle(struct kunit *test)
{
struct bridge_ctx *ctx = test->priv;
int ret;
ret = fpga_bridge_disable(ctx->bridge);
KUNIT_EXPECT_EQ(test, ret, 0);
KUNIT_EXPECT_FALSE(test, ctx->stats.enable);
ret = fpga_bridge_enable(ctx->bridge);
KUNIT_EXPECT_EQ(test, ret, 0);
KUNIT_EXPECT_TRUE(test, ctx->stats.enable);
}
/* Test the functions for getting and controlling a list of bridges */
static void fpga_bridge_test_get_put_list(struct kunit *test)
{
struct list_head bridge_list;
struct bridge_ctx *ctx_0, *ctx_1;
int ret;
ctx_0 = test->priv;
ctx_1 = register_test_bridge(test, "fpga-bridge-test-dev-1");
INIT_LIST_HEAD(&bridge_list);
/* Get bridge 0 and add it to the list */
ret = fpga_bridge_get_to_list(ctx_0->dev, NULL, &bridge_list);
KUNIT_EXPECT_EQ(test, ret, 0);
KUNIT_EXPECT_PTR_EQ(test, ctx_0->bridge,
list_first_entry_or_null(&bridge_list, struct fpga_bridge, node));
/* Get bridge 1 and add it to the list */
ret = fpga_bridge_get_to_list(ctx_1->dev, NULL, &bridge_list);
KUNIT_EXPECT_EQ(test, ret, 0);
KUNIT_EXPECT_PTR_EQ(test, ctx_1->bridge,
list_first_entry_or_null(&bridge_list, struct fpga_bridge, node));
/* Disable an then enable both bridges from the list */
ret = fpga_bridges_disable(&bridge_list);
KUNIT_EXPECT_EQ(test, ret, 0);
KUNIT_EXPECT_FALSE(test, ctx_0->stats.enable);
KUNIT_EXPECT_FALSE(test, ctx_1->stats.enable);
ret = fpga_bridges_enable(&bridge_list);
KUNIT_EXPECT_EQ(test, ret, 0);
KUNIT_EXPECT_TRUE(test, ctx_0->stats.enable);
KUNIT_EXPECT_TRUE(test, ctx_1->stats.enable);
/* Put and remove both bridges from the list */
fpga_bridges_put(&bridge_list);
KUNIT_EXPECT_TRUE(test, list_empty(&bridge_list));
}
static int fpga_bridge_test_init(struct kunit *test)
{
test->priv = register_test_bridge(test, "fpga-bridge-test-dev-0");
return 0;
}
static struct kunit_case fpga_bridge_test_cases[] = {
KUNIT_CASE(fpga_bridge_test_get),
KUNIT_CASE(fpga_bridge_test_toggle),
KUNIT_CASE(fpga_bridge_test_get_put_list),
{}
};
static struct kunit_suite fpga_bridge_suite = {
.name = "fpga_bridge",
.init = fpga_bridge_test_init,
.test_cases = fpga_bridge_test_cases,
};
kunit_test_suite(fpga_bridge_suite);
MODULE_LICENSE("GPL");
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