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1// SPDX-License-Identifier: GPL-2.0-only2/*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#include "rdvl.h"17 18int main(int argc, char **argv)19{20 unsigned int vq;21 int vl;22 static unsigned int vqs[SVE_VQ_MAX];23 unsigned int nvqs = 0;24 25 ksft_print_header();26 ksft_set_plan(2);27 28 if (!(getauxval(AT_HWCAP) & HWCAP_SVE))29 ksft_exit_skip("SVE not available\n");30 31 /*32 * Enumerate up to SVE_VQ_MAX vector lengths33 */34 for (vq = SVE_VQ_MAX; vq > 0; --vq) {35 vl = prctl(PR_SVE_SET_VL, vq * 16);36 if (vl == -1)37 ksft_exit_fail_msg("PR_SVE_SET_VL failed: %s (%d)\n",38 strerror(errno), errno);39 40 vl &= PR_SVE_VL_LEN_MASK;41 42 if (rdvl_sve() != vl)43 ksft_exit_fail_msg("PR_SVE_SET_VL reports %d, RDVL %d\n",44 vl, rdvl_sve());45 46 if (!sve_vl_valid(vl))47 ksft_exit_fail_msg("VL %d invalid\n", vl);48 vq = sve_vq_from_vl(vl);49 50 if (!(nvqs < SVE_VQ_MAX))51 ksft_exit_fail_msg("Too many VLs %u >= SVE_VQ_MAX\n",52 nvqs);53 vqs[nvqs++] = vq;54 }55 ksft_test_result_pass("Enumerated %d vector lengths\n", nvqs);56 ksft_test_result_pass("All vector lengths valid\n");57 58 /* Print out the vector lengths in ascending order: */59 while (nvqs--)60 ksft_print_msg("%u\n", 16 * vqs[nvqs]);61 62 ksft_exit_pass();63}64