Reviewed-by: Tomohiro Misono misono.tomohiro@jp.fujitsu.com
Thanks, Misono
Subject: [PATCH v2 4/4] selftests: arm64: Verify that all possible vector lengths are handled
As part of the enumeration interface for setting vector lengths it is valid to set vector lengths not supported in the system, these will be rounded to a supported vector length and returned from the prctl(). Add a test which exercises this for every valid vector length and makes sure that the return value is as expected and that this is reflected in the actual system state.
Signed-off-by: Mark Brown broonie@kernel.org
tools/testing/selftests/arm64/fp/vec-syscfg.c | 71 +++++++++++++++++++ 1 file changed, 71 insertions(+)
diff --git a/tools/testing/selftests/arm64/fp/vec-syscfg.c b/tools/testing/selftests/arm64/fp/vec-syscfg.c index 9d6ac843e651..de11cd2f5d79 100644 --- a/tools/testing/selftests/arm64/fp/vec-syscfg.c +++ b/tools/testing/selftests/arm64/fp/vec-syscfg.c @@ -540,6 +540,76 @@ static void prctl_set_onexec(struct vec_data *data) file_write_integer(data->default_vl_file, data->default_vl); }
+/* For each VQ verify that setting via prctl() does the right thing */ +static void prctl_set_all_vqs(struct vec_data *data) +{
- int ret, vq, vl, new_vl;
- int errors = 0;
- for (vq = SVE_VQ_MIN; vq <= SVE_VQ_MAX; vq++) {
vl = sve_vl_from_vq(vq);/* Attempt to set the VL */ret = prctl(data->prctl_set, vl);if (ret < 0) {errors++;ksft_print_msg("%s prctl set failed for %d: %d(%s)\n",
data->name, vl,errno, strerror(errno));continue;}new_vl = ret & PR_SVE_VL_LEN_MASK;/* Check that we actually have the reported new VL */if (data->rdvl() != new_vl) {ksft_print_msg("Set %s VL %d but RDVLreports %d\n",
data->name, new_vl, data->rdvl());errors++;}/* Was that the VL we asked for? */if (new_vl == vl)continue;/* Should round up to the minimum VL if below it */if (vl < data->min_vl) {if (new_vl != data->min_vl) {ksft_print_msg("%s VL %d returned %d notminimum %d\n",
data->name, vl, new_vl,data->min_vl);errors++;}continue;}/* Should round down to maximum VL if above it */if (vl > data->max_vl) {if (new_vl != data->max_vl) {ksft_print_msg("%s VL %d returned %d notmaximum %d\n",
data->name, vl, new_vl,data->max_vl);errors++;}continue;}/* Otherwise we should've rounded down */if (!(new_vl < vl)) {ksft_print_msg("%s VL %d returned %d, did not rounddown\n",
data->name, vl, new_vl);errors++;continue;}- }
- ksft_test_result(errors == 0, "%s prctl() set all VLs, %d errors\n",
data->name, errors);+}
typedef void (*test_type)(struct vec_data *);
static const test_type tests[] = { @@ -557,6 +627,7 @@ static const test_type tests[] = { prctl_set_no_child, prctl_set_for_child, prctl_set_onexec,
- prctl_set_all_vqs,
};
int main(void)
2.20.1