LXR qemu/tests/tcg/aarch64/sve-ioctls.c

   1/*
   2 * SVE ioctls tests
   3 *
   4 * Test the SVE width setting ioctls work and provide a base for
   5 * testing the gdbstub.
   6 *
   7 * Copyright (c) 2019 Linaro Ltd
   8 *
   9 * SPDX-License-Identifier: GPL-2.0-or-later
  10 */
  11#include <sys/prctl.h>
  12#include <asm/hwcap.h>
  13#include <stdio.h>
  14#include <sys/auxv.h>
  15#include <stdint.h>
  16#include <stdlib.h>
  17
  18#ifndef HWCAP_CPUID
  19#define HWCAP_CPUID (1 << 11)
  20#endif
  21
  22#define SVE_MAX_QUADS  (2048 / 128)
  23#define BYTES_PER_QUAD (128 / 8)
  24
  25#define get_cpu_reg(id) ({                                      \
  26            unsigned long __val;                                \
  27            asm("mrs %0, "#id : "=r" (__val));                  \
  28            __val;                                              \
  29        })
  30
  31static int do_sve_ioctl_test(void)
  32{
  33    int i, res, init_vq;
  34
  35    res = prctl(PR_SVE_GET_VL, 0, 0, 0, 0);
  36    if (res < 0) {
  37        printf("FAILED to PR_SVE_GET_VL (%d)", res);
  38        return -1;
  39    }
  40    init_vq = res & PR_SVE_VL_LEN_MASK;
  41
  42    for (i = init_vq; i > 15; i /= 2) {
  43        printf("Checking PR_SVE_SET_VL=%d\n", i);
  44        res = prctl(PR_SVE_SET_VL, i, 0, 0, 0, 0);
  45        if (res < 0) {
  46            printf("FAILED to PR_SVE_SET_VL (%d)", res);
  47            return -1;
  48        }
  49        asm("index z0.b, #0, #1\n"
  50            ".global __sve_ld_done\n"
  51            "__sve_ld_done:\n"
  52            "mov z0.b, #0\n"
  53            : /* no outputs kept */
  54            : /* no inputs */
  55            : "memory", "z0");
  56    }
  57    printf("PASS\n");
  58    return 0;
  59}
  60
  61int main(int argc, char **argv)
  62{
  63    /* we also need to probe for the ioctl support */
  64    if (getauxval(AT_HWCAP) & HWCAP_SVE) {
  65        return do_sve_ioctl_test();
  66    } else {
  67        printf("SKIP: no HWCAP_SVE on this system\n");
  68        return 0;
  69    }
  70}
  71