From: Pu Lehui <pulehui@xxxxxxxxxx>
RISC-V perf does not yet support branch sampling. Two riscv bpf
testcases get_branch_snapshot and perf_branches/perf_branches_hw failed
due to not disabling such sampling.
Signed-off-by: Pu Lehui <pulehui@xxxxxxxxxx>
---
drivers/perf/riscv_pmu.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/perf/riscv_pmu.c b/drivers/perf/riscv_pmu.c
index c78a6fd6c57f..bc42cb95a97c 100644
--- a/drivers/perf/riscv_pmu.c
+++ b/drivers/perf/riscv_pmu.c
@@ -313,6 +313,10 @@ static int riscv_pmu_event_init(struct perf_event *event)
u64 event_config = 0;
uint64_t cmask;
+ /* does not support taken branch sampling */
+ if (has_branch_stack(event))
+ return -EOPNOTSUPP;
+
hwc->flags = 0;
mapped_event = rvpmu->event_map(event, &event_config);
if (mapped_event < 0) {
--
2.34.1
