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1// SPDX-License-Identifier: GPL-2.02/*3 * KUnit test for the FPGA Region4 *5 * Copyright (C) 2023 Red Hat, Inc.6 *7 * Author: Marco Pagani <marpagan@redhat.com>8 */9 10#include <kunit/device.h>11#include <kunit/test.h>12#include <linux/fpga/fpga-bridge.h>13#include <linux/fpga/fpga-mgr.h>14#include <linux/fpga/fpga-region.h>15#include <linux/module.h>16#include <linux/types.h>17 18struct mgr_stats {19	u32 write_count;20};21 22struct bridge_stats {23	bool enable;24	u32 cycles_count;25};26 27struct test_ctx {28	struct fpga_manager *mgr;29	struct device *mgr_dev;30	struct fpga_bridge *bridge;31	struct device *bridge_dev;32	struct fpga_region *region;33	struct device *region_dev;34	struct bridge_stats bridge_stats;35	struct mgr_stats mgr_stats;36};37 38/*39 * Wrappers to avoid cast warnings when passing action functions directly40 * to kunit_add_action().41 */42KUNIT_DEFINE_ACTION_WRAPPER(fpga_image_info_free_wrapper, fpga_image_info_free,43			    struct fpga_image_info *);44 45KUNIT_DEFINE_ACTION_WRAPPER(fpga_bridge_unregister_wrapper, fpga_bridge_unregister,46			    struct fpga_bridge *);47 48KUNIT_DEFINE_ACTION_WRAPPER(fpga_region_unregister_wrapper, fpga_region_unregister,49			    struct fpga_region *);50 51static int op_write(struct fpga_manager *mgr, const char *buf, size_t count)52{53	struct mgr_stats *stats = mgr->priv;54 55	stats->write_count++;56 57	return 0;58}59 60/*61 * Fake FPGA manager that implements only the write op to count the number62 * of programming cycles. The internals of the programming sequence are63 * tested in the Manager suite since they are outside the responsibility64 * of the Region.65 */66static const struct fpga_manager_ops fake_mgr_ops = {67	.write = op_write,68};69 70static int op_enable_set(struct fpga_bridge *bridge, bool enable)71{72	struct bridge_stats *stats = bridge->priv;73 74	if (!stats->enable && enable)75		stats->cycles_count++;76 77	stats->enable = enable;78 79	return 0;80}81 82/*83 * Fake FPGA bridge that implements only enable_set op to count the number84 * of activation cycles.85 */86static const struct fpga_bridge_ops fake_bridge_ops = {87	.enable_set = op_enable_set,88};89 90static int fake_region_get_bridges(struct fpga_region *region)91{92	struct fpga_bridge *bridge = region->priv;93 94	return fpga_bridge_get_to_list(bridge->dev.parent, region->info, &region->bridge_list);95}96 97static int fake_region_match(struct device *dev, const void *data)98{99	return dev->parent == data;100}101 102static void fpga_region_test_class_find(struct kunit *test)103{104	struct test_ctx *ctx = test->priv;105	struct fpga_region *region;106 107	region = fpga_region_class_find(NULL, ctx->region_dev, fake_region_match);108	KUNIT_EXPECT_PTR_EQ(test, region, ctx->region);109 110	put_device(&region->dev);111}112 113/*114 * FPGA Region programming test. The Region must call get_bridges() to get115 * and control the bridges, and then the Manager for the actual programming.116 */117static void fpga_region_test_program_fpga(struct kunit *test)118{119	struct test_ctx *ctx = test->priv;120	struct fpga_image_info *img_info;121	char img_buf[4];122	int ret;123 124	img_info = fpga_image_info_alloc(ctx->mgr_dev);125	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, img_info);126 127	ret = kunit_add_action_or_reset(test, fpga_image_info_free_wrapper, img_info);128	KUNIT_ASSERT_EQ(test, ret, 0);129 130	img_info->buf = img_buf;131	img_info->count = sizeof(img_buf);132 133	ctx->region->info = img_info;134	ret = fpga_region_program_fpga(ctx->region);135	KUNIT_ASSERT_EQ(test, ret, 0);136 137	KUNIT_EXPECT_EQ(test, 1, ctx->mgr_stats.write_count);138	KUNIT_EXPECT_EQ(test, 1, ctx->bridge_stats.cycles_count);139 140	fpga_bridges_put(&ctx->region->bridge_list);141 142	ret = fpga_region_program_fpga(ctx->region);143	KUNIT_ASSERT_EQ(test, ret, 0);144 145	KUNIT_EXPECT_EQ(test, 2, ctx->mgr_stats.write_count);146	KUNIT_EXPECT_EQ(test, 2, ctx->bridge_stats.cycles_count);147 148	fpga_bridges_put(&ctx->region->bridge_list);149}150 151/*152 * The configuration used in this test suite uses a single bridge to153 * limit the code under test to a single unit. The functions used by the154 * Region for getting and controlling bridges are tested (with a list of155 * multiple bridges) in the Bridge suite.156 */157static int fpga_region_test_init(struct kunit *test)158{159	struct test_ctx *ctx;160	struct fpga_region_info region_info = { 0 };161	int ret;162 163	ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);164	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);165 166	ctx->mgr_dev = kunit_device_register(test, "fpga-manager-test-dev");167	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->mgr_dev);168 169	ctx->mgr = devm_fpga_mgr_register(ctx->mgr_dev, "Fake FPGA Manager",170					  &fake_mgr_ops, &ctx->mgr_stats);171	KUNIT_ASSERT_FALSE(test, IS_ERR_OR_NULL(ctx->mgr));172 173	ctx->bridge_dev = kunit_device_register(test, "fpga-bridge-test-dev");174	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->bridge_dev);175 176	ctx->bridge = fpga_bridge_register(ctx->bridge_dev, "Fake FPGA Bridge",177					   &fake_bridge_ops, &ctx->bridge_stats);178	KUNIT_ASSERT_FALSE(test, IS_ERR_OR_NULL(ctx->bridge));179 180	ctx->bridge_stats.enable = true;181 182	ret = kunit_add_action_or_reset(test, fpga_bridge_unregister_wrapper, ctx->bridge);183	KUNIT_ASSERT_EQ(test, ret, 0);184 185	ctx->region_dev = kunit_device_register(test, "fpga-region-test-dev");186	KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->region_dev);187 188	region_info.mgr = ctx->mgr;189	region_info.priv = ctx->bridge;190	region_info.get_bridges = fake_region_get_bridges;191 192	ctx->region = fpga_region_register_full(ctx->region_dev, &region_info);193	KUNIT_ASSERT_FALSE(test, IS_ERR_OR_NULL(ctx->region));194 195	ret = kunit_add_action_or_reset(test, fpga_region_unregister_wrapper, ctx->region);196	KUNIT_ASSERT_EQ(test, ret, 0);197 198	test->priv = ctx;199 200	return 0;201}202 203static struct kunit_case fpga_region_test_cases[] = {204	KUNIT_CASE(fpga_region_test_class_find),205	KUNIT_CASE(fpga_region_test_program_fpga),206	{}207};208 209static struct kunit_suite fpga_region_suite = {210	.name = "fpga_region",211	.init = fpga_region_test_init,212	.test_cases = fpga_region_test_cases,213};214 215kunit_test_suite(fpga_region_suite);216 217MODULE_LICENSE("GPL");218