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@xxxxxxxxxx>
---
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 RDVL reports %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 not minimum %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 not maximum %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 round down\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
