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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>
This commit is contained in:
Nikita Shubin 2021-12-08 14:16:54 +03:00 committed by Anup Patel
parent 66fbcc03df
commit 460041c816
1 changed files with 2 additions and 1 deletions
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3
lib/sbi/sbi_pmu.c
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@ -467,7 +467,8 @@ static int pmu_update_hw_mhpmevent(struct sbi_pmu_hw_event *hw_evt, int ctr_idx,
return SBI_EFAIL; return SBI_EFAIL;
/* Always clear the OVF bit and inhibit countin of events in M-mode */ /* 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 */ /* Update the inhibit flags based on inhibit flags received from supervisor */
pmu_update_inhibit_flags(flags, &mhpmevent_val); pmu_update_inhibit_flags(flags, &mhpmevent_val);