6.11-stable review patch. If anyone has any objections, please let me know.
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From: Pu Lehui pulehui@huawei.com
commit c625154993d0d24a962b1830cd5ed92adda2cf86 upstream.
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: 9b3e150e310e ("RISC-V: Add a simple platform driver for RISC-V legacy perf") Fixes: 16d3b1af0944 ("perf: RISC-V: Check standard event availability") Fixes: e9991434596f ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/perf/riscv_pmu_legacy.c | 4 ++-- drivers/perf/riscv_pmu_sbi.c | 4 ++-- 2 files changed, 4 insertions(+), 4 deletions(-)
--- 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 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 */ --- 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 s 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 } break; default: - ret = -EINVAL; + ret = -ENOENT; break; }