1 // SPDX-License-Identifier: GPL-2.0
3 * KUnit test for the FPGA Region
5 * Copyright (C) 2023 Red Hat, Inc.
10 #include <kunit/test.h>
11 #include <linux/fpga/fpga-bridge.h>
12 #include <linux/fpga/fpga-mgr.h>
13 #include <linux/fpga/fpga-region.h>
14 #include <linux/module.h>
15 #include <linux/platform_device.h>
16 #include <linux/types.h>
28 struct fpga_manager *mgr;
29 struct platform_device *mgr_pdev;
30 struct fpga_bridge *bridge;
31 struct platform_device *bridge_pdev;
32 struct fpga_region *region;
33 struct platform_device *region_pdev;
34 struct bridge_stats bridge_stats;
35 struct mgr_stats mgr_stats;
38 static int op_write(struct fpga_manager *mgr, const char *buf, size_t count)
40 struct mgr_stats *stats = mgr->priv;
48 * Fake FPGA manager that implements only the write op to count the number
49 * of programming cycles. The internals of the programming sequence are
50 * tested in the Manager suite since they are outside the responsibility
53 static const struct fpga_manager_ops fake_mgr_ops = {
57 static int op_enable_set(struct fpga_bridge *bridge, bool enable)
59 struct bridge_stats *stats = bridge->priv;
61 if (!stats->enable && enable)
62 stats->cycles_count++;
64 stats->enable = enable;
70 * Fake FPGA bridge that implements only enable_set op to count the number
71 * of activation cycles.
73 static const struct fpga_bridge_ops fake_bridge_ops = {
74 .enable_set = op_enable_set,
77 static int fake_region_get_bridges(struct fpga_region *region)
79 struct fpga_bridge *bridge = region->priv;
81 return fpga_bridge_get_to_list(bridge->dev.parent, region->info, ®ion->bridge_list);
84 static int fake_region_match(struct device *dev, const void *data)
86 return dev->parent == data;
89 static void fpga_region_test_class_find(struct kunit *test)
91 struct test_ctx *ctx = test->priv;
92 struct fpga_region *region;
94 region = fpga_region_class_find(NULL, &ctx->region_pdev->dev, fake_region_match);
95 KUNIT_EXPECT_PTR_EQ(test, region, ctx->region);
99 * FPGA Region programming test. The Region must call get_bridges() to get
100 * and control the bridges, and then the Manager for the actual programming.
102 static void fpga_region_test_program_fpga(struct kunit *test)
104 struct test_ctx *ctx = test->priv;
105 struct fpga_image_info *img_info;
109 img_info = fpga_image_info_alloc(&ctx->mgr_pdev->dev);
110 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, img_info);
112 img_info->buf = img_buf;
113 img_info->count = sizeof(img_buf);
115 ctx->region->info = img_info;
116 ret = fpga_region_program_fpga(ctx->region);
117 KUNIT_ASSERT_EQ(test, ret, 0);
119 KUNIT_EXPECT_EQ(test, 1, ctx->mgr_stats.write_count);
120 KUNIT_EXPECT_EQ(test, 1, ctx->bridge_stats.cycles_count);
122 fpga_bridges_put(&ctx->region->bridge_list);
124 ret = fpga_region_program_fpga(ctx->region);
125 KUNIT_ASSERT_EQ(test, ret, 0);
127 KUNIT_EXPECT_EQ(test, 2, ctx->mgr_stats.write_count);
128 KUNIT_EXPECT_EQ(test, 2, ctx->bridge_stats.cycles_count);
130 fpga_bridges_put(&ctx->region->bridge_list);
132 fpga_image_info_free(img_info);
136 * The configuration used in this test suite uses a single bridge to
137 * limit the code under test to a single unit. The functions used by the
138 * Region for getting and controlling bridges are tested (with a list of
139 * multiple bridges) in the Bridge suite.
141 static int fpga_region_test_init(struct kunit *test)
143 struct test_ctx *ctx;
144 struct fpga_region_info region_info = { 0 };
146 ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL);
147 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx);
149 ctx->mgr_pdev = platform_device_register_simple("mgr_pdev", PLATFORM_DEVID_AUTO, NULL, 0);
150 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->mgr_pdev);
152 ctx->mgr = devm_fpga_mgr_register(&ctx->mgr_pdev->dev, "Fake FPGA Manager", &fake_mgr_ops,
154 KUNIT_ASSERT_FALSE(test, IS_ERR_OR_NULL(ctx->mgr));
156 ctx->bridge_pdev = platform_device_register_simple("bridge_pdev", PLATFORM_DEVID_AUTO,
158 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->bridge_pdev);
160 ctx->bridge = fpga_bridge_register(&ctx->bridge_pdev->dev, "Fake FPGA Bridge",
161 &fake_bridge_ops, &ctx->bridge_stats);
162 KUNIT_ASSERT_FALSE(test, IS_ERR_OR_NULL(ctx->bridge));
164 ctx->bridge_stats.enable = true;
166 ctx->region_pdev = platform_device_register_simple("region_pdev", PLATFORM_DEVID_AUTO,
168 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->region_pdev);
170 region_info.mgr = ctx->mgr;
171 region_info.priv = ctx->bridge;
172 region_info.get_bridges = fake_region_get_bridges;
174 ctx->region = fpga_region_register_full(&ctx->region_pdev->dev, ®ion_info);
175 KUNIT_ASSERT_FALSE(test, IS_ERR_OR_NULL(ctx->region));
182 static void fpga_region_test_exit(struct kunit *test)
184 struct test_ctx *ctx = test->priv;
186 fpga_region_unregister(ctx->region);
187 platform_device_unregister(ctx->region_pdev);
189 fpga_bridge_unregister(ctx->bridge);
190 platform_device_unregister(ctx->bridge_pdev);
192 platform_device_unregister(ctx->mgr_pdev);
195 static struct kunit_case fpga_region_test_cases[] = {
196 KUNIT_CASE(fpga_region_test_class_find),
197 KUNIT_CASE(fpga_region_test_program_fpga),
202 static struct kunit_suite fpga_region_suite = {
204 .init = fpga_region_test_init,
205 .exit = fpga_region_test_exit,
206 .test_cases = fpga_region_test_cases,
209 kunit_test_suite(fpga_region_suite);
211 MODULE_LICENSE("GPL");