[PATCH v14 29/39] kselftest/arm64: sme: Add SME support to vlset

Mark Brown
2022-04-19T11:25:42Z

The Scalable Matrix Extenions (SME) introduces additional register state
with configurable vector lengths, similar to SVE but configured separately.
Extend vlset to support configuring this state with a --sme or -s command
line option.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Shuah Khan <skhan@linuxfoundation.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
---
tools/testing/selftests/arm64/fp/vlset.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/arm64/fp/vlset.c b/tools/testing/selftests/arm64/fp/vlset.c
index 308d27a68226..76912a581a95 100644
--- a/tools/testing/selftests/arm64/fp/vlset.c
+++ b/tools/testing/selftests/arm64/fp/vlset.c
@@ -22,12 +22,15 @@ static int inherit = 0;
static int no_inherit = 0;
static int force = 0;
static unsigned long vl;
+static int set_ctl = PR_SVE_SET_VL;
+static int get_ctl = PR_SVE_GET_VL;

static const struct option options[] = {
{ "force", no_argument, NULL, 'f' },
{ "inherit", no_argument, NULL, 'i' },
{ "max", no_argument, NULL, 'M' },
{ "no-inherit", no_argument, &no_inherit, 1 },
+ { "sme", no_argument, NULL, 's' },
{ "help", no_argument, NULL, '?' },
{}
};
@@ -50,6 +53,9 @@ static int parse_options(int argc, char **argv)
case 'M': vl = SVE_VL_MAX; break;
case 'f': force = 1; break;
case 'i': inherit = 1; break;
+ case 's': set_ctl = PR_SME_SET_VL;
+ get_ctl = PR_SME_GET_VL;
+ break;
case 0: break;
default: goto error;
}
@@ -125,14 +131,14 @@ int main(int argc, char **argv)
if (inherit)
flags |= PR_SVE_VL_INHERIT;

- t = prctl(PR_SVE_SET_VL, vl | flags);
+ t = prctl(set_ctl, vl | flags);
if (t < 0) {
fprintf(stderr, "%s: PR_SVE_SET_VL: %s\n",
program_name, strerror(errno));
goto error;
}

- t = prctl(PR_SVE_GET_VL);
+ t = prctl(get_ctl);
if (t == -1) {
fprintf(stderr, "%s: PR_SVE_GET_VL: %s\n",
program_name, strerror(errno));
--
2.30.2