lib/test_bits.c

   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");