From: Florian Lehner <dev@der-flo.net>
To: bpf@vger.kernel.org
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
john.fastabend@gmail.com, peterz@infradead.org, mingo@redhat.com,
acme@kernel.org, Florian Lehner <dev@der-flo.net>
Subject: [PATCH bpf,perf]] bpf,perf: return EOPNOTSUPP for attaching bpf handler on PERF_COUNT_SW_DUMMY
Date: Sat, 14 Nov 2020 14:51:26 +0100 [thread overview]
Message-ID: <20201114135126.29462-1-dev@der-flo.net> (raw)
At the moment it is not possible to attach a bpf handler to a perf event
of type PERF_TYPE_SOFTWARE with a configuration of PERF_COUNT_SW_DUMMY.
Signed-off-by: Florian Lehner <dev@der-flo.net>
---
kernel/events/core.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index da467e1dd49a..4e8846b7ceda 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -9668,6 +9668,10 @@ static int perf_event_set_bpf_handler(struct perf_event *event, u32 prog_fd)
if (event->prog)
return -EEXIST;
+ if (event->attr.type == PERF_TYPE_SOFTWARE &&
+ event->attr.config == PERF_COUNT_SW_DUMMY)
+ return -EOPNOTSUPP;
+
prog = bpf_prog_get_type(prog_fd, BPF_PROG_TYPE_PERF_EVENT);
if (IS_ERR(prog))
return PTR_ERR(prog);
--
2.28.0
next reply other threads:[~2020-11-14 14:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-14 13:51 Florian Lehner [this message]
2020-11-14 16:07 ` [PATCH bpf,perf]] bpf,perf: return EOPNOTSUPP for attaching bpf handler on PERF_COUNT_SW_DUMMY Alexei Starovoitov
2020-11-14 18:49 ` Florian Lehner
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