1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Test cases for functions and macros in bits.h 4 */ 5 6 #include <kunit/test.h> 7 #include <linux/bits.h> 8 9 10 static void genmask_test(struct kunit *test) 11 { 12 KUNIT_EXPECT_EQ(test, 1ul, GENMASK(0, 0)); 13 KUNIT_EXPECT_EQ(test, 3ul, GENMASK(1, 0)); 14 KUNIT_EXPECT_EQ(test, 6ul, GENMASK(2, 1)); 15 KUNIT_EXPECT_EQ(test, 0xFFFFFFFFul, GENMASK(31, 0)); 16 17 #ifdef TEST_GENMASK_FAILURES 18 /* these should fail compilation */ 19 GENMASK(0, 1); 20 GENMASK(0, 10); 21 GENMASK(9, 10); 22 #endif 23 24 25 } 26 27 static void genmask_ull_test(struct kunit *test) 28 { 29 KUNIT_EXPECT_EQ(test, 1ull, GENMASK_ULL(0, 0)); 30 KUNIT_EXPECT_EQ(test, 3ull, GENMASK_ULL(1, 0)); 31 KUNIT_EXPECT_EQ(test, 0x000000ffffe00000ull, GENMASK_ULL(39, 21)); 32 KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, GENMASK_ULL(63, 0)); 33 34 #ifdef TEST_GENMASK_FAILURES 35 /* these should fail compilation */ 36 GENMASK_ULL(0, 1); 37 GENMASK_ULL(0, 10); 38 GENMASK_ULL(9, 10); 39 #endif 40 } 41 42 static void genmask_u128_test(struct kunit *test) 43 { 44 #ifdef CONFIG_ARCH_SUPPORTS_INT128 45 /* Below 64 bit masks */ 46 KUNIT_EXPECT_EQ(test, 0x0000000000000001ull, GENMASK_U128(0, 0)); 47 KUNIT_EXPECT_EQ(test, 0x0000000000000003ull, GENMASK_U128(1, 0)); 48 KUNIT_EXPECT_EQ(test, 0x0000000000000006ull, GENMASK_U128(2, 1)); 49 KUNIT_EXPECT_EQ(test, 0x00000000ffffffffull, GENMASK_U128(31, 0)); 50 KUNIT_EXPECT_EQ(test, 0x000000ffffe00000ull, GENMASK_U128(39, 21)); 51 KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, GENMASK_U128(63, 0)); 52 53 /* Above 64 bit masks - only 64 bit portion can be validated once */ 54 KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, GENMASK_U128(64, 0) >> 1); 55 KUNIT_EXPECT_EQ(test, 0x00000000ffffffffull, GENMASK_U128(81, 50) >> 50); 56 KUNIT_EXPECT_EQ(test, 0x0000000000ffffffull, GENMASK_U128(87, 64) >> 64); 57 KUNIT_EXPECT_EQ(test, 0x0000000000ff0000ull, GENMASK_U128(87, 80) >> 64); 58 59 KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, GENMASK_U128(127, 0) >> 64); 60 KUNIT_EXPECT_EQ(test, 0xffffffffffffffffull, (u64)GENMASK_U128(127, 0)); 61 KUNIT_EXPECT_EQ(test, 0x0000000000000003ull, GENMASK_U128(127, 126) >> 126); 62 KUNIT_EXPECT_EQ(test, 0x0000000000000001ull, GENMASK_U128(127, 127) >> 127); 63 #ifdef TEST_GENMASK_FAILURES 64 /* these should fail compilation */ 65 GENMASK_U128(0, 1); 66 GENMASK_U128(0, 10); 67 GENMASK_U128(9, 10); 68 #endif /* TEST_GENMASK_FAILURES */ 69 #endif /* CONFIG_ARCH_SUPPORTS_INT128 */ 70 } 71 72 static void genmask_input_check_test(struct kunit *test) 73 { 74 unsigned int x, y; 75 int z, w; 76 77 /* Unknown input */ 78 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, 0)); 79 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, x)); 80 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(x, y)); 81 82 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, 0)); 83 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(0, z)); 84 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(z, w)); 85 86 /* Valid input */ 87 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(1, 1)); 88 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(39, 21)); 89 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(100, 80)); 90 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(110, 65)); 91 KUNIT_EXPECT_EQ(test, 0, GENMASK_INPUT_CHECK(127, 0)); 92 } 93 94 95 static struct kunit_case bits_test_cases[] = { 96 KUNIT_CASE(genmask_test), 97 KUNIT_CASE(genmask_ull_test), 98 KUNIT_CASE(genmask_u128_test), 99 KUNIT_CASE(genmask_input_check_test), 100 {} 101 }; 102 103 static struct kunit_suite bits_test_suite = { 104 .name = "bits-test", 105 .test_cases = bits_test_cases, 106 }; 107 kunit_test_suite(bits_test_suite); 108 109 MODULE_DESCRIPTION("Test cases for functions and macros in bits.h"); 110 MODULE_LICENSE("GPL"); 111