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Date: Wed, 24 Nov 2021 09:41:19 +0100
From: Jiri Olsa <jolsa@...hat.com>
To: Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Andrii Nakryiko <andrii@...nel.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Masami Hiramatsu <mhiramat@...nel.org>,
Steven Rostedt <rostedt@...dmis.org>
Cc: netdev@...r.kernel.org, bpf@...r.kernel.org,
lkml <linux-kernel@...r.kernel.org>,
Ingo Molnar <mingo@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Martin KaFai Lau <kafai@...com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
John Fastabend <john.fastabend@...il.com>,
KP Singh <kpsingh@...omium.org>,
Ravi Bangoria <ravi.bangoria@....com>
Subject: [PATCH 8/8] selftest/bpf: Add uprobe multi attach test
Adding uprobe multi attach test that uses new interface
to attach multiple probes within single perf event.
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
.../bpf/prog_tests/multi_uprobe_test.c | 97 +++++++++++++++++++
.../selftests/bpf/progs/multi_uprobe.c | 26 +++++
2 files changed, 123 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/multi_uprobe_test.c
create mode 100644 tools/testing/selftests/bpf/progs/multi_uprobe.c
diff --git a/tools/testing/selftests/bpf/prog_tests/multi_uprobe_test.c b/tools/testing/selftests/bpf/prog_tests/multi_uprobe_test.c
new file mode 100644
index 000000000000..0f939893ef45
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/multi_uprobe_test.c
@@ -0,0 +1,97 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <test_progs.h>
+#include "multi_uprobe.skel.h"
+
+/* this is how USDT semaphore is actually defined, except volatile modifier */
+extern volatile unsigned short uprobe_ref_ctr;
+
+/* attach points */
+static void method0(void) { return ; }
+static void method1(void) { return ; }
+static void method2(void) { return ; }
+static void method3(void) { return ; }
+static void method4(void) { return ; }
+static void method5(void) { return ; }
+static void method6(void) { return ; }
+static void method7(void) { return ; }
+
+void test_multi_uprobe_test(void)
+{
+ DECLARE_LIBBPF_OPTS(bpf_uprobe_opts, uprobe_opts);
+ struct bpf_link *uretprobe_link = NULL;
+ struct bpf_link *uprobe_link = NULL;
+ ssize_t base_addr, ref_ctr_offset;
+ struct multi_uprobe *skel;
+ const char *paths[8];
+ int duration = 0;
+ __u64 offs[8];
+
+ skel = multi_uprobe__open_and_load();
+ if (CHECK(!skel, "skel_open", "failed to open skeleton\n"))
+ return;
+
+ base_addr = get_base_addr();
+ if (CHECK(base_addr < 0, "get_base_addr",
+ "failed to find base addr: %zd", base_addr))
+ return;
+
+ ref_ctr_offset = get_rel_offset((uintptr_t)&uprobe_ref_ctr);
+ if (!ASSERT_GE(ref_ctr_offset, 0, "ref_ctr_offset"))
+ return;
+
+#define INIT(__i) \
+ do { \
+ paths[__i] = (const char *) "/proc/self/exe"; \
+ offs[__i] = get_uprobe_offset(&method ## __i, base_addr); \
+ } while (0)
+
+ INIT(0);
+ INIT(1);
+ INIT(2);
+ INIT(3);
+ INIT(4);
+ INIT(5);
+ INIT(6);
+ INIT(7);
+
+#undef INIT
+
+ uprobe_opts.multi.paths = paths;
+ uprobe_opts.multi.offs = offs;
+
+ uprobe_opts.multi.cnt = 8;
+
+ uprobe_opts.retprobe = false;
+ uprobe_opts.ref_ctr_offset = ref_ctr_offset;
+ uprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uprobe,
+ 0 /* self pid */,
+ NULL, 0,
+ &uprobe_opts);
+ if (!ASSERT_OK_PTR(uprobe_link, "attach_uprobe"))
+ goto cleanup;
+
+ uprobe_opts.retprobe = true;
+ uretprobe_link = bpf_program__attach_uprobe_opts(skel->progs.handle_uretprobe,
+ -1 /* any pid */,
+ NULL, 0,
+ &uprobe_opts);
+ if (!ASSERT_OK_PTR(uretprobe_link, "attach_uretprobe"))
+ goto cleanup;
+
+ method0();
+ method1();
+ method2();
+ method3();
+ method4();
+ method5();
+ method6();
+ method7();
+
+ ASSERT_EQ(skel->bss->test_uprobe_result, 8, "test_uprobe_result");
+ ASSERT_EQ(skel->bss->test_uretprobe_result, 8, "test_uretprobe_result");
+
+cleanup:
+ bpf_link__destroy(uretprobe_link);
+ bpf_link__destroy(uprobe_link);
+ multi_uprobe__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/multi_uprobe.c b/tools/testing/selftests/bpf/progs/multi_uprobe.c
new file mode 100644
index 000000000000..831f7b98baef
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/multi_uprobe.c
@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/ptrace.h>
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+__u64 test_uprobe_result = 0;
+
+SEC("uprobe/trigger_func")
+int handle_uprobe(struct pt_regs *ctx)
+{
+ test_uprobe_result++;
+ return 0;
+}
+
+__u64 test_uretprobe_result = 0;
+
+SEC("uretprobe/trigger_func")
+int handle_uretprobe(struct pt_regs *ctx)
+{
+ test_uretprobe_result++;
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";
--
2.33.1
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