1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * KUnit test for the FPGA Bridge 4 * 5 * Copyright (C) 2023 Red Hat, Inc. 6 * 7 * Author: Marco Pagani <marpagan@redhat.com> 8 */ 9 10 #include <kunit/test.h> 11 #include <linux/device.h> 12 #include <linux/fpga/fpga-bridge.h> 13 #include <linux/module.h> 14 #include <linux/types.h> 15 16 struct bridge_stats { 17 bool enable; 18 }; 19 20 struct bridge_ctx { 21 struct fpga_bridge *bridge; 22 struct platform_device *pdev; 23 struct bridge_stats stats; 24 }; 25 26 static int op_enable_set(struct fpga_bridge *bridge, bool enable) 27 { 28 struct bridge_stats *stats = bridge->priv; 29 30 stats->enable = enable; 31 32 return 0; 33 } 34 35 /* 36 * Fake FPGA bridge that implements only the enable_set op to track 37 * the state. 38 */ 39 static const struct fpga_bridge_ops fake_bridge_ops = { 40 .enable_set = op_enable_set, 41 }; 42 43 /** 44 * register_test_bridge() - Register a fake FPGA bridge for testing. 45 * @test: KUnit test context object. 46 * 47 * Return: Context of the newly registered FPGA bridge. 48 */ 49 static struct bridge_ctx *register_test_bridge(struct kunit *test) 50 { 51 struct bridge_ctx *ctx; 52 53 ctx = kunit_kzalloc(test, sizeof(*ctx), GFP_KERNEL); 54 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx); 55 56 ctx->pdev = platform_device_register_simple("bridge_pdev", PLATFORM_DEVID_AUTO, NULL, 0); 57 KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ctx->pdev); 58 59 ctx->bridge = fpga_bridge_register(&ctx->pdev->dev, "Fake FPGA bridge", &fake_bridge_ops, 60 &ctx->stats); 61 KUNIT_ASSERT_FALSE(test, IS_ERR_OR_NULL(ctx->bridge)); 62 63 return ctx; 64 } 65 66 static void unregister_test_bridge(struct bridge_ctx *ctx) 67 { 68 fpga_bridge_unregister(ctx->bridge); 69 platform_device_unregister(ctx->pdev); 70 } 71 72 static void fpga_bridge_test_get(struct kunit *test) 73 { 74 struct bridge_ctx *ctx = test->priv; 75 struct fpga_bridge *bridge; 76 77 bridge = fpga_bridge_get(&ctx->pdev->dev, NULL); 78 KUNIT_EXPECT_PTR_EQ(test, bridge, ctx->bridge); 79 80 bridge = fpga_bridge_get(&ctx->pdev->dev, NULL); 81 KUNIT_EXPECT_EQ(test, PTR_ERR(bridge), -EBUSY); 82 83 fpga_bridge_put(ctx->bridge); 84 } 85 86 static void fpga_bridge_test_toggle(struct kunit *test) 87 { 88 struct bridge_ctx *ctx = test->priv; 89 int ret; 90 91 ret = fpga_bridge_disable(ctx->bridge); 92 KUNIT_EXPECT_EQ(test, ret, 0); 93 KUNIT_EXPECT_FALSE(test, ctx->stats.enable); 94 95 ret = fpga_bridge_enable(ctx->bridge); 96 KUNIT_EXPECT_EQ(test, ret, 0); 97 KUNIT_EXPECT_TRUE(test, ctx->stats.enable); 98 } 99 100 /* Test the functions for getting and controlling a list of bridges */ 101 static void fpga_bridge_test_get_put_list(struct kunit *test) 102 { 103 struct list_head bridge_list; 104 struct bridge_ctx *ctx_0, *ctx_1; 105 int ret; 106 107 ctx_0 = test->priv; 108 ctx_1 = register_test_bridge(test); 109 110 INIT_LIST_HEAD(&bridge_list); 111 112 /* Get bridge 0 and add it to the list */ 113 ret = fpga_bridge_get_to_list(&ctx_0->pdev->dev, NULL, &bridge_list); 114 KUNIT_EXPECT_EQ(test, ret, 0); 115 116 KUNIT_EXPECT_PTR_EQ(test, ctx_0->bridge, 117 list_first_entry_or_null(&bridge_list, struct fpga_bridge, node)); 118 119 /* Get bridge 1 and add it to the list */ 120 ret = fpga_bridge_get_to_list(&ctx_1->pdev->dev, NULL, &bridge_list); 121 KUNIT_EXPECT_EQ(test, ret, 0); 122 123 KUNIT_EXPECT_PTR_EQ(test, ctx_1->bridge, 124 list_first_entry_or_null(&bridge_list, struct fpga_bridge, node)); 125 126 /* Disable an then enable both bridges from the list */ 127 ret = fpga_bridges_disable(&bridge_list); 128 KUNIT_EXPECT_EQ(test, ret, 0); 129 130 KUNIT_EXPECT_FALSE(test, ctx_0->stats.enable); 131 KUNIT_EXPECT_FALSE(test, ctx_1->stats.enable); 132 133 ret = fpga_bridges_enable(&bridge_list); 134 KUNIT_EXPECT_EQ(test, ret, 0); 135 136 KUNIT_EXPECT_TRUE(test, ctx_0->stats.enable); 137 KUNIT_EXPECT_TRUE(test, ctx_1->stats.enable); 138 139 /* Put and remove both bridges from the list */ 140 fpga_bridges_put(&bridge_list); 141 142 KUNIT_EXPECT_TRUE(test, list_empty(&bridge_list)); 143 144 unregister_test_bridge(ctx_1); 145 } 146 147 static int fpga_bridge_test_init(struct kunit *test) 148 { 149 test->priv = register_test_bridge(test); 150 151 return 0; 152 } 153 154 static void fpga_bridge_test_exit(struct kunit *test) 155 { 156 unregister_test_bridge(test->priv); 157 } 158 159 static struct kunit_case fpga_bridge_test_cases[] = { 160 KUNIT_CASE(fpga_bridge_test_get), 161 KUNIT_CASE(fpga_bridge_test_toggle), 162 KUNIT_CASE(fpga_bridge_test_get_put_list), 163 {} 164 }; 165 166 static struct kunit_suite fpga_bridge_suite = { 167 .name = "fpga_bridge", 168 .init = fpga_bridge_test_init, 169 .exit = fpga_bridge_test_exit, 170 .test_cases = fpga_bridge_test_cases, 171 }; 172 173 kunit_test_suite(fpga_bridge_suite); 174 175 MODULE_LICENSE("GPL"); 176