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selftests: arm64: Test case for enumeration of SVE vector lengths 

Add a test case that verifies that we can enumerate the SVE vector lengths
on systems where we detect SVE, and that those SVE vector lengths are
valid. This program was written by Dave Martin and adapted to kselftest by
me.

Signed-off-by: Mark Brown <broonie@kernel.org>
Acked-by: Dave Martin <Dave.Martin@arm.com>
Acked-by: Shuah Khan <skhan@linuxfoundation.org>
Link: https://lore.kernel.org/r/20200819114837.51466-2-broonie@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mark Brown 2020-08-19 12:48:32 +01:00 committed by Will Deacon
parent d21435e967
commit ca765153eb
1 changed files with 58 additions and 0 deletions
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58
tools/testing/selftests/arm64/fp/sve-probe-vls.c Normal file
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// 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"
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");
/*
* 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 (!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();
}