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kselftest/arm64: Validate that changing one VL type does not affect another 

On a system with both SVE and SME when we change one of the VLs this should
not result in a change in the other VL. Add a check that this is in fact
the case to vec-syscfg.

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230720-arm64-fix-sve-sme-vl-change-v2-3-8eea06b82d57@kernel.org
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Mark Brown 2023-07-20 19:39:00 +01:00 committed by Will Deacon
parent 0c7c237b1c
commit 0aeead9bb2
1 changed files with 21 additions and 1 deletions
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22
tools/testing/selftests/arm64/fp/vec-syscfg.c
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@ -554,7 +554,8 @@ static void prctl_set_onexec(struct vec_data *data)
/* 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 ret, vq, vl, new_vl, i;
int orig_vls[ARRAY_SIZE(vec_data)];
int errors = 0;
if (!data->min_vl || !data->max_vl) {
@ -563,6 +564,9 @@ static void prctl_set_all_vqs(struct vec_data *data)
return;
}
for (i = 0; i < ARRAY_SIZE(vec_data); i++)
orig_vls[i] = vec_data[i].rdvl();
for (vq = SVE_VQ_MIN; vq <= SVE_VQ_MAX; vq++) {
vl = sve_vl_from_vq(vq);
@ -585,6 +589,22 @@ static void prctl_set_all_vqs(struct vec_data *data)
errors++;
}
/* Did any other VLs change? */
for (i = 0; i < ARRAY_SIZE(vec_data); i++) {
if (&vec_data[i] == data)
continue;
if (!(getauxval(vec_data[i].hwcap_type) & vec_data[i].hwcap))
continue;
if (vec_data[i].rdvl() != orig_vls[i]) {
ksft_print_msg("%s VL changed from %d to %d\n",
vec_data[i].name, orig_vls[i],
vec_data[i].rdvl());
errors++;
}
}
/* Was that the VL we asked for? */
if (new_vl == vl)
continue;