From: Pu Lehui <pulehui@huaweicloud.com>
To: linux-riscv@lists.infradead.org, bpf@vger.kernel.org
Cc: "Atish Patra" <atishp@atishpatra.org>,
"Anup Patel" <anup@brainfault.org>,
"Palmer Dabbelt" <palmer@dabbelt.com>,
"Björn Töpel" <bjorn@kernel.org>, "Pu Lehui" <pulehui@huawei.com>,
"Pu Lehui" <pulehui@huaweicloud.com>
Subject: [PATCH] drivers/perf: riscv: Disable PERF_SAMPLE_BRANCH_* while not supported
Date: Tue, 5 Mar 2024 15:52:23 +0000 [thread overview]
Message-ID: <20240305155223.1823287-1-pulehui@huaweicloud.com> (raw)
From: Pu Lehui <pulehui@huawei.com>
RISC-V perf does not yet support branch sampling. Two riscv bpf
testcases get_branch_snapshot and perf_branches/perf_branches_hw failed
due to not disabling such sampling.
Signed-off-by: Pu Lehui <pulehui@huawei.com>
---
drivers/perf/riscv_pmu.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/perf/riscv_pmu.c b/drivers/perf/riscv_pmu.c
index c78a6fd6c57f..bc42cb95a97c 100644
--- a/drivers/perf/riscv_pmu.c
+++ b/drivers/perf/riscv_pmu.c
@@ -313,6 +313,10 @@ static int riscv_pmu_event_init(struct perf_event *event)
u64 event_config = 0;
uint64_t cmask;
+ /* does not support taken branch sampling */
+ if (has_branch_stack(event))
+ return -EOPNOTSUPP;
+
hwc->flags = 0;
mapped_event = rvpmu->event_map(event, &event_config);
if (mapped_event < 0) {
--
2.34.1
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next reply other threads:[~2024-03-05 15:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-05 15:52 Pu Lehui [this message]
2024-03-07 17:52 ` [PATCH] drivers/perf: riscv: Disable PERF_SAMPLE_BRANCH_* while not supported Conor Dooley
2024-03-09 6:48 ` Pu Lehui
2024-03-09 9:06 ` Atish Patra
2024-03-12 1:18 ` Pu Lehui
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