// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2015-2020 ARM Limited. * Original author: Dave Martin <Dave.Martin@arm.com> */ #include <assert.h> #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/auxv.h> #include <sys/prctl.h> #include <asm/sigcontext.h> #include "kselftest.h" #include "rdvl.h" int main(int argc, char **argv) { unsigned int vq; int vl; static unsigned int vqs[SVE_VQ_MAX]; unsigned int nvqs = 0; ksft_print_header(); ksft_set_plan(2); if (!(getauxval(AT_HWCAP) & HWCAP_SVE)) ksft_exit_skip("SVE not available\n"); /* * Enumerate up to SVE_VQ_MAX vector lengths */ for (vq = SVE_VQ_MAX; vq > 0; --vq) { vl = prctl(PR_SVE_SET_VL, vq * 16); if (vl == -1) ksft_exit_fail_msg("PR_SVE_SET_VL failed: %s (%d)\n", strerror(errno), errno); vl &= PR_SVE_VL_LEN_MASK; if (rdvl_sve() != vl) ksft_exit_fail_msg("PR_SVE_SET_VL reports %d, RDVL %d\n", vl, rdvl_sve()); if (!sve_vl_valid(vl)) ksft_exit_fail_msg("VL %d invalid\n", vl); vq = sve_vq_from_vl(vl); if (!(nvqs < SVE_VQ_MAX)) ksft_exit_fail_msg("Too many VLs %u >= SVE_VQ_MAX\n", nvqs); vqs[nvqs++] = vq; } ksft_test_result_pass("Enumerated %d vector lengths\n", nvqs); ksft_test_result_pass("All vector lengths valid\n"); /* Print out the vector lengths in ascending order: */ while (nvqs--) ksft_print_msg("%u\n", 16 * vqs[nvqs]); ksft_exit_pass(); }