The PMU unit tests fail with an UNDEF exception when no PMU
is available (although KVM hasn't been totally consistent
with that in the past).
This is caused by PMCR_EL0 being read *before* ID_AA64DFR0_EL1
is checked for the PMU version.
Move the PMCR_EL0 access to a reasonable place, which allows the
test to soft-fail gracefully.
Fixes: 784ee933fa5f ("arm: pmu: Introduce defines for PMU versions")
Reported-by: Andrew Walbran <qwandor@xxxxxxxxxx>
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
---
arm/pmu.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arm/pmu.c b/arm/pmu.c
index cc959e6..15c542a 100644
--- a/arm/pmu.c
+++ b/arm/pmu.c
@@ -988,7 +988,7 @@ static void pmccntr64_test(void)
/* Return FALSE if no PMU found, otherwise return TRUE */
static bool pmu_probe(void)
{
- uint32_t pmcr = get_pmcr();
+ uint32_t pmcr;
uint8_t implementer;
pmu.version = get_pmu_version();
@@ -997,6 +997,7 @@ static bool pmu_probe(void)
report_info("PMU version: 0x%x", pmu.version);
+ pmcr = get_pmcr();
implementer = (pmcr >> PMU_PMCR_IMP_SHIFT) & PMU_PMCR_IMP_MASK;
report_info("PMU implementer/ID code: %#"PRIx32"(\"%c\")/%#"PRIx32,
(pmcr >> PMU_PMCR_IMP_SHIFT) & PMU_PMCR_IMP_MASK,
--
2.30.0
