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154 lines
4.4 KiB
154 lines
4.4 KiB
// SPDX-License-Identifier: GPL-2.0+ |
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/* |
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* Test cases for bitfield helpers. |
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*/ |
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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#include <kunit/test.h> |
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#include <linux/bitfield.h> |
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#define CHECK_ENC_GET_U(tp, v, field, res) do { \ |
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{ \ |
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u##tp _res; \ |
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\ |
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_res = u##tp##_encode_bits(v, field); \ |
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KUNIT_ASSERT_FALSE_MSG(context, _res != res, \ |
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"u" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != " #res "\n", \ |
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(u64)_res); \ |
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KUNIT_ASSERT_FALSE(context, \ |
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u##tp##_get_bits(_res, field) != v); \ |
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} \ |
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} while (0) |
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#define CHECK_ENC_GET_LE(tp, v, field, res) do { \ |
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{ \ |
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__le##tp _res; \ |
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\ |
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_res = le##tp##_encode_bits(v, field); \ |
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KUNIT_ASSERT_FALSE_MSG(context, \ |
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_res != cpu_to_le##tp(res), \ |
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"le" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != 0x%llx",\ |
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(u64)le##tp##_to_cpu(_res), \ |
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(u64)(res)); \ |
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KUNIT_ASSERT_FALSE(context, \ |
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le##tp##_get_bits(_res, field) != v);\ |
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} \ |
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} while (0) |
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#define CHECK_ENC_GET_BE(tp, v, field, res) do { \ |
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{ \ |
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__be##tp _res; \ |
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\ |
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_res = be##tp##_encode_bits(v, field); \ |
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KUNIT_ASSERT_FALSE_MSG(context, \ |
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_res != cpu_to_be##tp(res), \ |
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"be" #tp "_encode_bits(" #v ", " #field ") is 0x%llx != 0x%llx", \ |
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(u64)be##tp##_to_cpu(_res), \ |
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(u64)(res)); \ |
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KUNIT_ASSERT_FALSE(context, \ |
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be##tp##_get_bits(_res, field) != v);\ |
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} \ |
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} while (0) |
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#define CHECK_ENC_GET(tp, v, field, res) do { \ |
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CHECK_ENC_GET_U(tp, v, field, res); \ |
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CHECK_ENC_GET_LE(tp, v, field, res); \ |
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CHECK_ENC_GET_BE(tp, v, field, res); \ |
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} while (0) |
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static void __init test_bitfields_constants(struct kunit *context) |
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{ |
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/* |
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* NOTE |
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* This whole function compiles (or at least should, if everything |
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* is going according to plan) to nothing after optimisation. |
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*/ |
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CHECK_ENC_GET(16, 1, 0x000f, 0x0001); |
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CHECK_ENC_GET(16, 3, 0x00f0, 0x0030); |
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CHECK_ENC_GET(16, 5, 0x0f00, 0x0500); |
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CHECK_ENC_GET(16, 7, 0xf000, 0x7000); |
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CHECK_ENC_GET(16, 14, 0x000f, 0x000e); |
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CHECK_ENC_GET(16, 15, 0x00f0, 0x00f0); |
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CHECK_ENC_GET_U(8, 1, 0x0f, 0x01); |
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CHECK_ENC_GET_U(8, 3, 0xf0, 0x30); |
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CHECK_ENC_GET_U(8, 14, 0x0f, 0x0e); |
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CHECK_ENC_GET_U(8, 15, 0xf0, 0xf0); |
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CHECK_ENC_GET(32, 1, 0x00000f00, 0x00000100); |
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CHECK_ENC_GET(32, 3, 0x0000f000, 0x00003000); |
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CHECK_ENC_GET(32, 5, 0x000f0000, 0x00050000); |
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CHECK_ENC_GET(32, 7, 0x00f00000, 0x00700000); |
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CHECK_ENC_GET(32, 14, 0x0f000000, 0x0e000000); |
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CHECK_ENC_GET(32, 15, 0xf0000000, 0xf0000000); |
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CHECK_ENC_GET(64, 1, 0x00000f0000000000ull, 0x0000010000000000ull); |
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CHECK_ENC_GET(64, 3, 0x0000f00000000000ull, 0x0000300000000000ull); |
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CHECK_ENC_GET(64, 5, 0x000f000000000000ull, 0x0005000000000000ull); |
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CHECK_ENC_GET(64, 7, 0x00f0000000000000ull, 0x0070000000000000ull); |
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CHECK_ENC_GET(64, 14, 0x0f00000000000000ull, 0x0e00000000000000ull); |
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CHECK_ENC_GET(64, 15, 0xf000000000000000ull, 0xf000000000000000ull); |
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} |
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#define CHECK(tp, mask) do { \ |
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u64 v; \ |
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\ |
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for (v = 0; v < 1 << hweight32(mask); v++) \ |
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KUNIT_ASSERT_FALSE(context, \ |
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tp##_encode_bits(v, mask) != v << __ffs64(mask));\ |
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} while (0) |
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static void __init test_bitfields_variables(struct kunit *context) |
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{ |
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CHECK(u8, 0x0f); |
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CHECK(u8, 0xf0); |
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CHECK(u8, 0x38); |
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CHECK(u16, 0x0038); |
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CHECK(u16, 0x0380); |
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CHECK(u16, 0x3800); |
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CHECK(u16, 0x8000); |
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CHECK(u32, 0x80000000); |
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CHECK(u32, 0x7f000000); |
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CHECK(u32, 0x07e00000); |
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CHECK(u32, 0x00018000); |
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CHECK(u64, 0x8000000000000000ull); |
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CHECK(u64, 0x7f00000000000000ull); |
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CHECK(u64, 0x0001800000000000ull); |
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CHECK(u64, 0x0000000080000000ull); |
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CHECK(u64, 0x000000007f000000ull); |
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CHECK(u64, 0x0000000018000000ull); |
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CHECK(u64, 0x0000001f8000000ull); |
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} |
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#ifdef TEST_BITFIELD_COMPILE |
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static void __init test_bitfields_compile(struct kunit *context) |
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{ |
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/* these should fail compilation */ |
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CHECK_ENC_GET(16, 16, 0x0f00, 0x1000); |
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u32_encode_bits(7, 0x06000000); |
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/* this should at least give a warning */ |
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u16_encode_bits(0, 0x60000); |
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} |
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#endif |
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static struct kunit_case __refdata bitfields_test_cases[] = { |
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KUNIT_CASE(test_bitfields_constants), |
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KUNIT_CASE(test_bitfields_variables), |
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{} |
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}; |
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static struct kunit_suite bitfields_test_suite = { |
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.name = "bitfields", |
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.test_cases = bitfields_test_cases, |
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}; |
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kunit_test_suites(&bitfields_test_suite); |
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MODULE_AUTHOR("Johannes Berg <[email protected]>"); |
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MODULE_LICENSE("GPL");
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