[PATCH 8/8] selftest/bpf: Add uprobe multi attach test

[Jiri Olsa <jolsa@redhat.com>]

Adding uprobe multi attach test that uses new interface
to attach multiple probes within single perf event.

Signed-off-by: Jiri Olsa <jolsa@kernel.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