Przeglądaj źródła

lib: pmu: check SSCOF before masking

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@yadro.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
Reviewed-by: Xiang W <wxjstz@126.com>
Nikita Shubin 2 lat temu
rodzic
commit
460041c816
1 zmienionych plików z 2 dodań i 1 usunięć
  1. 2 1
      lib/sbi/sbi_pmu.c

+ 2 - 1
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);