From ca765153eb90577e5fda281485048427b80a9a77 Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Wed, 19 Aug 2020 12:48:32 +0100 Subject: [PATCH] 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 Acked-by: Dave Martin Acked-by: Shuah Khan Link: https://lore.kernel.org/r/20200819114837.51466-2-broonie@kernel.org Signed-off-by: Will Deacon --- .../selftests/arm64/fp/sve-probe-vls.c | 58 +++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100644 tools/testing/selftests/arm64/fp/sve-probe-vls.c diff --git a/tools/testing/selftests/arm64/fp/sve-probe-vls.c b/tools/testing/selftests/arm64/fp/sve-probe-vls.c new file mode 100644 index 0000000000000..b29cbc642c574 --- /dev/null +++ b/tools/testing/selftests/arm64/fp/sve-probe-vls.c @@ -0,0 +1,58 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (C) 2015-2020 ARM Limited. + * Original author: Dave Martin + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#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(); +} -- 2.30.2