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lib: sbi_pmu: ensure update hpm counter before starting counting

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When detecting features of PMU, the hpm counter may be written to some
value, this will cause some unexpected behavior in some cases. So ensure
the hpm counter is updated before starting the counter and the related
interrupt.

Signed-off-by: Haijiao Liu <haijiao.liu@sophgo.com>
Co-authored-by: Inochi Amaoto <inochiama@outlook.com>
Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Tested-by: Samuel Holland <samuel@sholland.org>
This commit is contained in:
Inochi Amaoto 2023-08-15 17:40:31 +08:00 • committed by Anup Patel
parent b20bd479ef
commit 664692f507
1 changed files with 9 additions and 7 deletions
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16
lib/sbi/sbi_pmu.c
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@ -353,8 +353,11 @@ static int pmu_ctr_start_hw(uint32_t cidx, uint64_t ival, bool ival_update)
if (cidx >= num_hw_ctrs || cidx == 1)
return SBI_EINVAL;
if (sbi_hart_priv_version(scratch) < SBI_HART_PRIV_VER_1_11)
goto skip_inhibit_update;
if (sbi_hart_priv_version(scratch) < SBI_HART_PRIV_VER_1_11) {
if (ival_update)
pmu_ctr_write_hw(cidx, ival);
return 0;
}
/*
* Some of the hardware may not support mcountinhibit but perf stat
@ -368,13 +371,12 @@ static int pmu_ctr_start_hw(uint32_t cidx, uint64_t ival, bool ival_update)
if (sbi_hart_has_extension(scratch, SBI_HART_EXT_SSCOFPMF))
pmu_ctr_enable_irq_hw(cidx);
if (pmu_dev && pmu_dev->hw_counter_enable_irq)
pmu_dev->hw_counter_enable_irq(cidx);
csr_write(CSR_MCOUNTINHIBIT, mctr_inhbt);
skip_inhibit_update:
if (ival_update)
pmu_ctr_write_hw(cidx, ival);
if (pmu_dev && pmu_dev->hw_counter_enable_irq)
pmu_dev->hw_counter_enable_irq(cidx);
csr_write(CSR_MCOUNTINHIBIT, mctr_inhbt);
return 0;
}