linux-kernel - [PATCH perf/core 06/11] libbpf: Add support to attach unique uprobe

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Message-ID: <20250902143504.1224726-7-jolsa@kernel.org>
Date: Tue,  2 Sep 2025 16:34:59 +0200
From: Jiri Olsa <jolsa@...nel.org>
To: Oleg Nesterov <oleg@...hat.com>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrii Nakryiko <andrii@...nel.org>
Cc: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	x86@...nel.org,
	Song Liu <songliubraving@...com>,
	Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	Hao Luo <haoluo@...gle.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: [PATCH perf/core 06/11] libbpf: Add support to attach unique uprobe_multi uprobe

Adding support to attach unique uprobe multi by adding the 'unique'
bool flag to struct bpf_uprobe_multi_opts.

Also adding "uprobe.unique[.s]" auto load sections to create
uprobe_multi unique uprobe.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/lib/bpf/libbpf.c | 7 ++++++-
 tools/lib/bpf/libbpf.h | 4 +++-
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/tools/lib/bpf/libbpf.c b/tools/lib/bpf/libbpf.c
index 8f5a81b672e1..1f613a5f95b6 100644
--- a/tools/lib/bpf/libbpf.c
+++ b/tools/lib/bpf/libbpf.c
@@ -9525,6 +9525,8 @@ static const struct bpf_sec_def section_defs[] = {
 	SEC_DEF("uprobe.multi+",	KPROBE,	BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi),
 	SEC_DEF("uretprobe.multi+",	KPROBE,	BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi),
 	SEC_DEF("uprobe.session+",	KPROBE,	BPF_TRACE_UPROBE_SESSION, SEC_NONE, attach_uprobe_multi),
+	SEC_DEF("uprobe.unique+",	KPROBE,	BPF_TRACE_UPROBE_MULTI, SEC_NONE, attach_uprobe_multi),
+	SEC_DEF("uprobe.unique.s+",	KPROBE,	BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi),
 	SEC_DEF("uprobe.multi.s+",	KPROBE,	BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi),
 	SEC_DEF("uretprobe.multi.s+",	KPROBE,	BPF_TRACE_UPROBE_MULTI, SEC_SLEEPABLE, attach_uprobe_multi),
 	SEC_DEF("uprobe.session.s+",	KPROBE,	BPF_TRACE_UPROBE_SESSION, SEC_SLEEPABLE, attach_uprobe_multi),
@@ -11880,6 +11882,7 @@ static int attach_uprobe_multi(const struct bpf_program *prog, long cookie, stru
 	case 3:
 		opts.session = str_has_pfx(probe_type, "uprobe.session");
 		opts.retprobe = str_has_pfx(probe_type, "uretprobe.multi");
+		opts.unique = str_has_pfx(probe_type, "uprobe.unique");
 
 		*link = bpf_program__attach_uprobe_multi(prog, -1, binary_path, func_name, &opts);
 		ret = libbpf_get_error(*link);
@@ -12116,10 +12119,10 @@ bpf_program__attach_uprobe_multi(const struct bpf_program *prog,
 	LIBBPF_OPTS(bpf_link_create_opts, lopts);
 	unsigned long *resolved_offsets = NULL;
 	enum bpf_attach_type attach_type;
+	bool retprobe, session, unique;
 	int err = 0, link_fd, prog_fd;
 	struct bpf_link *link = NULL;
 	char full_path[PATH_MAX];
-	bool retprobe, session;
 	const __u64 *cookies;
 	const char **syms;
 	size_t cnt;
@@ -12141,6 +12144,7 @@ bpf_program__attach_uprobe_multi(const struct bpf_program *prog,
 	cnt = OPTS_GET(opts, cnt, 0);
 	retprobe = OPTS_GET(opts, retprobe, false);
 	session  = OPTS_GET(opts, session, false);
+	unique = OPTS_GET(opts, unique, false);
 
 	/*
 	 * User can specify 2 mutually exclusive set of inputs:
@@ -12203,6 +12207,7 @@ bpf_program__attach_uprobe_multi(const struct bpf_program *prog,
 	lopts.uprobe_multi.cookies = cookies;
 	lopts.uprobe_multi.cnt = cnt;
 	lopts.uprobe_multi.flags = retprobe ? BPF_F_UPROBE_MULTI_RETURN : 0;
+	lopts.uprobe_multi.flags |= unique ? BPF_F_UPROBE_MULTI_UNIQUE : 0;
 
 	if (pid == 0)
 		pid = getpid();
diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h
index 455a957cb702..13a10299331b 100644
--- a/tools/lib/bpf/libbpf.h
+++ b/tools/lib/bpf/libbpf.h
@@ -596,10 +596,12 @@ struct bpf_uprobe_multi_opts {
 	bool retprobe;
 	/* create session kprobes */
 	bool session;
+	/* create unique uprobe */
+	bool unique;
 	size_t :0;
 };
 
-#define bpf_uprobe_multi_opts__last_field session
+#define bpf_uprobe_multi_opts__last_field unique
 
 /**
  * @brief **bpf_program__attach_uprobe_multi()** attaches a BPF program
-- 
2.51.0