On Wed, Apr 03, 2024 at 01:04:36AM -0700, Atish Patra wrote:
For RV32, used_hw_ctrs can have more than 1 word if the firmware chooses to interleave firmware/hardware counters indicies. Even though it's a unlikely scenario, handle that case by iterating over all the words instead of just using the first word.
Signed-off-by: Atish Patra atishp@rivosinc.com
drivers/perf/riscv_pmu_sbi.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-)
diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c index 8c3475d55433..82336fec82b8 100644 --- a/drivers/perf/riscv_pmu_sbi.c +++ b/drivers/perf/riscv_pmu_sbi.c @@ -771,13 +771,15 @@ static inline void pmu_sbi_stop_hw_ctrs(struct riscv_pmu *pmu) { struct cpu_hw_events *cpu_hw_evt = this_cpu_ptr(pmu->hw_events); unsigned long flag = 0;
- int i;
if (sbi_pmu_snapshot_available()) flag = SBI_PMU_STOP_FLAG_TAKE_SNAPSHOT;
- /* No need to check the error here as we can't do anything about the error */
- sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_STOP, 0,
cpu_hw_evt->used_hw_ctrs[0], flag, 0, 0, 0);
- for (i = 0; i < BITS_TO_LONGS(RISCV_MAX_COUNTERS); i++)
/* No need to check the error here as we can't do anything about the error */sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_STOP, i * BITS_PER_LONG,cpu_hw_evt->used_hw_ctrs[i], flag, 0, 0, 0);} /* @@ -789,7 +791,7 @@ static inline void pmu_sbi_stop_hw_ctrs(struct riscv_pmu *pmu) static noinline void pmu_sbi_start_ovf_ctrs_sbi(struct cpu_hw_events *cpu_hw_evt, unsigned long ctr_ovf_mask) {
- int idx = 0;
- int idx = 0, i; struct perf_event *event; unsigned long flag = SBI_PMU_START_FLAG_SET_INIT_VALUE; unsigned long ctr_start_mask = 0;
@@ -797,11 +799,12 @@ static noinline void pmu_sbi_start_ovf_ctrs_sbi(struct cpu_hw_events *cpu_hw_evt struct hw_perf_event *hwc; u64 init_val = 0;
- ctr_start_mask = cpu_hw_evt->used_hw_ctrs[0] & ~ctr_ovf_mask;
- /* Start all the counters that did not overflow in a single shot */
- sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, 0, ctr_start_mask,
0, 0, 0, 0);
- for (i = 0; i < BITS_TO_LONGS(RISCV_MAX_COUNTERS); i++) {
ctr_start_mask = cpu_hw_evt->used_hw_ctrs[i] & ~ctr_ovf_mask;/* Start all the counters that did not overflow in a single shot */sbi_ecall(SBI_EXT_PMU, SBI_EXT_PMU_COUNTER_START, i * BITS_PER_LONG, ctr_start_mask,0, 0, 0, 0);- }
/* Reinitialize and start all the counter that overflowed */ while (ctr_ovf_mask) { -- 2.34.1
Reviewed-by: Andrew Jones ajones@ventanamicro.com