tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2015-2020 ARM Limited.
4 * Original author: Dave Martin <Dave.Martin@arm.com>
5 */
6#include <assert.h>
7#include <errno.h>
8#include <stdio.h>
9#include <stdlib.h>
10#include <string.h>
11#include <sys/auxv.h>
12#include <sys/prctl.h>
13#include <asm/sigcontext.h>
14
15#include "../../kselftest.h"
16
17int main(int argc, char **argv)
18{
19 unsigned int vq;
20 int vl;
21 static unsigned int vqs[SVE_VQ_MAX];
22 unsigned int nvqs = 0;
23
24 ksft_print_header();
25 ksft_set_plan(2);
26
27 if (!(getauxval(AT_HWCAP) & HWCAP_SVE))
28 ksft_exit_skip("SVE not available");
29
30 /*
31 * Enumerate up to SVE_VQ_MAX vector lengths
32 */
33 for (vq = SVE_VQ_MAX; vq > 0; --vq) {
34 vl = prctl(PR_SVE_SET_VL, vq * 16);
35 if (vl == -1)
36 ksft_exit_fail_msg("PR_SVE_SET_VL failed: %s (%d)\n",
37 strerror(errno), errno);
38
39 vl &= PR_SVE_VL_LEN_MASK;
40
41 if (!sve_vl_valid(vl))
42 ksft_exit_fail_msg("VL %d invalid\n", vl);
43 vq = sve_vq_from_vl(vl);
44
45 if (!(nvqs < SVE_VQ_MAX))
46 ksft_exit_fail_msg("Too many VLs %u >= SVE_VQ_MAX\n",
47 nvqs);
48 vqs[nvqs++] = vq;
49 }
50 ksft_test_result_pass("Enumerated %d vector lengths\n", nvqs);
51 ksft_test_result_pass("All vector lengths valid\n");
52
53 /* Print out the vector lengths in ascending order: */
54 while (nvqs--)
55 ksft_print_msg("%u\n", 16 * vqs[nvqs]);
56
57 ksft_exit_pass();
58}