1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2015-2020 ARM Limited.
4 * Original author: Dave Martin <Dave.Martin@arm.com>
12 #include <sys/prctl.h>
13 #include <asm/sigcontext.h>
15 #include "../../kselftest.h"
17 int main(int argc, char **argv)
21 static unsigned int vqs[SVE_VQ_MAX];
22 unsigned int nvqs = 0;
27 if (!(getauxval(AT_HWCAP) & HWCAP_SVE))
28 ksft_exit_skip("SVE not available\n");
31 * Enumerate up to SVE_VQ_MAX vector lengths
33 for (vq = SVE_VQ_MAX; vq > 0; --vq) {
34 vl = prctl(PR_SVE_SET_VL, vq * 16);
36 ksft_exit_fail_msg("PR_SVE_SET_VL failed: %s (%d)\n",
37 strerror(errno), errno);
39 vl &= PR_SVE_VL_LEN_MASK;
41 if (!sve_vl_valid(vl))
42 ksft_exit_fail_msg("VL %d invalid\n", vl);
43 vq = sve_vq_from_vl(vl);
45 if (!(nvqs < SVE_VQ_MAX))
46 ksft_exit_fail_msg("Too many VLs %u >= SVE_VQ_MAX\n",
50 ksft_test_result_pass("Enumerated %d vector lengths\n", nvqs);
51 ksft_test_result_pass("All vector lengths valid\n");
53 /* Print out the vector lengths in ascending order: */
55 ksft_print_msg("%u\n", 16 * vqs[nvqs]);