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drivers/perf: riscv: Align errno for unsupported perf event

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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.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>
Fixes: 9b3e150e31 ("RISC-V: Add a simple platform driver for RISC-V legacy perf")
Fixes: 16d3b1af09 ("perf: RISC-V: Check standard event availability")
Fixes: e999143459 ("RISC-V: Add perf platform driver based on SBI PMU extension")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240831071520.1630360-1-pulehui@huaweicloud.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Pu Lehui 2024-08-31 07:15:20 +00:00 committed by Palmer Dabbelt
parent 9852d85ec9
commit c625154993
No known key found for this signature in database
GPG Key ID: 2E1319F35FBB1889
2 changed files with 4 additions and 4 deletions
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4
drivers/perf/riscv_pmu_legacy.c
View File

@ -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 */

4
drivers/perf/riscv_pmu_sbi.c
View File

@ -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;
}
}
@ -556,7 +556,7 @@ static int pmu_sbi_event_map(struct perf_event *event, u64 *econfig)
}
break;
default:
ret = -EINVAL;
ret = -ENOENT;
break;
}