[PATCH v2] drivers/perf: riscv: Align errno for unsupported perf event

[Pu Lehui]

On 2024/8/31 15:15, Pu Lehui wrote:
> From: Pu Lehui <pulehui at huawei.com>
> 
> RISC-V perf driver does not yet support PERF_TYPE_BREAKPOINT. It would
> be more appropriate to return -EOPNOTSUPP or -ENOENT for this type in
> pmu_sbi_event_map. Considering that other implementations return -ENOENT
> for unsupported perf types, let's synchronize this behavior. Due to this
> reason, a riscv bpf testcases perf_skip fail. Meanwhile, align that
> behavior to the rest of proper place.

Hi Atish,

Is current modification appropriate? Hope if you have time to review it.

Thanks.

> 
> Signed-off-by: Pu Lehui <pulehui at huawei.com>
> ---
>   drivers/perf/riscv_pmu_legacy.c | 4 ++--
>   drivers/perf/riscv_pmu_sbi.c    | 4 ++--
>   2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/perf/riscv_pmu_legacy.c b/drivers/perf/riscv_pmu_legacy.c
> index 04487ad7fba0..93c8e0fdb589 100644
> --- a/drivers/perf/riscv_pmu_legacy.c
> +++ b/drivers/perf/riscv_pmu_legacy.c
> @@ -22,13 +22,13 @@ static int pmu_legacy_ctr_get_idx(struct perf_event *event)
>   	struct perf_event_attr *attr = &event->attr;
>   
>   	if (event->attr.type != PERF_TYPE_HARDWARE)
> -		return -EOPNOTSUPP;
> +		return -ENOENT;
>   	if (attr->config == PERF_COUNT_HW_CPU_CYCLES)
>   		return RISCV_PMU_LEGACY_CYCLE;
>   	else if (attr->config == PERF_COUNT_HW_INSTRUCTIONS)
>   		return RISCV_PMU_LEGACY_INSTRET;
>   	else
> -		return -EOPNOTSUPP;
> +		return -ENOENT;
>   }
>   
>   /* For legacy config & counter index are same */
> diff --git a/drivers/perf/riscv_pmu_sbi.c b/drivers/perf/riscv_pmu_sbi.c
> index 44d3951d009f..169c5157b916 100644
> --- a/drivers/perf/riscv_pmu_sbi.c
> +++ b/drivers/perf/riscv_pmu_sbi.c
> @@ -309,7 +309,7 @@ static void pmu_sbi_check_event(struct sbi_pmu_event_data *edata)
>   			  ret.value, 0x1, SBI_PMU_STOP_FLAG_RESET, 0, 0, 0);
>   	} else if (ret.error == SBI_ERR_NOT_SUPPORTED) {
>   		/* This event cannot be monitored by any counter */
> -		edata->event_idx = -EINVAL;
> +		edata->event_idx = -ENOENT;
>   	}
>   }
>   
> @@ -543,7 +543,7 @@ static int pmu_sbi_event_map(struct perf_event *event, u64 *econfig)
>   		}
>   		break;
>   	default:
> -		ret = -EINVAL;
> +		ret = -ENOENT;
>   		break;
>   	}
>