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}
59