tests/sys_hwprobe_test.cpp

/*
 * Copyright (C) 2023 The Android Open Source Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *  * Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <gtest/gtest.h>

#if __has_include(<sys/hwprobe.h>)
#include <sys/hwprobe.h>
#include <sys/syscall.h>
#endif

TEST(sys_hwprobe, __riscv_hwprobe) {
#if defined(__riscv) && __has_include(<sys/hwprobe.h>)
  riscv_hwprobe probes[] = {{.key = RISCV_HWPROBE_KEY_IMA_EXT_0},
                            {.key = RISCV_HWPROBE_KEY_CPUPERF_0}};
  ASSERT_EQ(0, __riscv_hwprobe(probes, 2, 0, nullptr, 0));
  EXPECT_EQ(RISCV_HWPROBE_KEY_IMA_EXT_0, probes[0].key);
  EXPECT_TRUE((probes[0].value & RISCV_HWPROBE_IMA_FD) != 0);
  EXPECT_TRUE((probes[0].value & RISCV_HWPROBE_IMA_C) != 0);
  // TODO: remove #define when our uapi headers are new enough.
#define RISCV_HWPROBE_IMA_V (1 << 2)
  EXPECT_TRUE((probes[0].value & RISCV_HWPROBE_IMA_V) != 0);
  // TODO: remove #ifs when our kernel is new enough.
#if defined(RISCV_HWPROBE_EXT_ZBA)
  EXPECT_TRUE((probes[0].value & RISCV_HWPROBE_EXT_ZBA) != 0);
#endif
#if defined(RISCV_HWPROBE_EXT_ZBB)
  EXPECT_TRUE((probes[0].value & RISCV_HWPROBE_EXT_ZBB) != 0);
#endif
#if defined(RISCV_HWPROBE_EXT_ZBS)
  EXPECT_TRUE((probes[0].value & RISCV_HWPROBE_EXT_ZBS) != 0);
#endif

  EXPECT_EQ(RISCV_HWPROBE_KEY_CPUPERF_0, probes[1].key);
  EXPECT_TRUE((probes[1].value & RISCV_HWPROBE_MISALIGNED_MASK) == RISCV_HWPROBE_MISALIGNED_FAST);
#else
  GTEST_SKIP() << "__riscv_hwprobe requires riscv64";
#endif
}

TEST(sys_hwprobe, __riscv_hwprobe_syscall_vdso) {
#if defined(__riscv) && __has_include(<sys/hwprobe.h>)
  riscv_hwprobe probes_vdso[] = {{.key = RISCV_HWPROBE_KEY_IMA_EXT_0},
                                 {.key = RISCV_HWPROBE_KEY_CPUPERF_0}};
  ASSERT_EQ(0, __riscv_hwprobe(probes_vdso, 2, 0, nullptr, 0));

  riscv_hwprobe probes_syscall[] = {{.key = RISCV_HWPROBE_KEY_IMA_EXT_0},
                                    {.key = RISCV_HWPROBE_KEY_CPUPERF_0}};
  ASSERT_EQ(0, syscall(SYS_riscv_hwprobe, probes_syscall, 2, 0, nullptr, 0));

  // Check we got the same answers from the vdso and the syscall.
  EXPECT_EQ(RISCV_HWPROBE_KEY_IMA_EXT_0, probes_syscall[0].key);
  EXPECT_EQ(probes_vdso[0].key, probes_syscall[0].key);
  EXPECT_EQ(probes_vdso[0].value, probes_syscall[0].value);
  EXPECT_EQ(RISCV_HWPROBE_KEY_CPUPERF_0, probes_syscall[1].key);
  EXPECT_EQ(probes_vdso[1].key, probes_syscall[1].key);
  EXPECT_EQ(probes_vdso[1].value, probes_syscall[1].value);
#else
  GTEST_SKIP() << "__riscv_hwprobe requires riscv64";
#endif
}