[PATCH] lib: pmu: check SSCOF before masking

[Nikita Shubin]

From: Nikita Shubin <n.shubin at yadro.com>

We should check if SSCOF extension is present,
before applying inhibit mask and clearing overflow,
otherwise undesirable value can be written
in MHPMEVENT_N CSR.

Signed-off-by: Nikita Shubin <n.shubin at yadro.com>
---
 lib/sbi/sbi_pmu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/sbi/sbi_pmu.c b/lib/sbi/sbi_pmu.c
index 10668a3..5b845f8 100644
--- a/lib/sbi/sbi_pmu.c
+++ b/lib/sbi/sbi_pmu.c
@@ -467,7 +467,8 @@ static int pmu_update_hw_mhpmevent(struct sbi_pmu_hw_event *hw_evt, int ctr_idx,
 		return SBI_EFAIL;
 
 	/* Always clear the OVF bit and inhibit countin of events in M-mode */
-	mhpmevent_val = (mhpmevent_val & ~MHPMEVENT_SSCOF_MASK) | MHPMEVENT_MINH;
+	if (sbi_hart_has_feature(scratch, SBI_HART_HAS_SSCOFPMF))
+		mhpmevent_val = (mhpmevent_val & ~MHPMEVENT_SSCOF_MASK) | MHPMEVENT_MINH;
 
 	/* Update the inhibit flags based on inhibit flags received from supervisor */
 	pmu_update_inhibit_flags(flags, &mhpmevent_val);
-- 
2.31.1