1 files changed, 59 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/perf_event_stackmap.c b/tools/testing/selftests/bpf/progs/perf_event_stackmap.c
new file mode 100644
index 000000000000..f793280a3238
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/perf_event_stackmap.c
@@ -0,0 +1,59 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2020 Facebook
+#include "vmlinux.h"
+#include <bpf/bpf_helpers.h>
+
+#ifndef PERF_MAX_STACK_DEPTH
+#define PERF_MAX_STACK_DEPTH         127
+#endif
+
+typedef __u64 stack_trace_t[PERF_MAX_STACK_DEPTH];
+struct {
+	__uint(type, BPF_MAP_TYPE_STACK_TRACE);
+	__uint(max_entries, 16384);
+	__type(key, __u32);
+	__type(value, stack_trace_t);
+} stackmap SEC(".maps");
+
+struct {
+	__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
+	__uint(max_entries, 1);
+	__type(key, __u32);
+	__type(value, stack_trace_t);
+} stackdata_map SEC(".maps");
+
+long stackid_kernel = 1;
+long stackid_user = 1;
+long stack_kernel = 1;
+long stack_user = 1;
+
+SEC("perf_event")
+int oncpu(void *ctx)
+{
+	stack_trace_t *trace;
+	__u32 key = 0;
+	long val;
+
+	val = bpf_get_stackid(ctx, &stackmap, 0);
+	if (val >= 0)
+		stackid_kernel = 2;
+	val = bpf_get_stackid(ctx, &stackmap, BPF_F_USER_STACK);
+	if (val >= 0)
+		stackid_user = 2;
+
+	trace = bpf_map_lookup_elem(&stackdata_map, &key);
+	if (!trace)
+		return 0;
+
+	val = bpf_get_stack(ctx, trace, sizeof(stack_trace_t), 0);
+	if (val > 0)
+		stack_kernel = 2;
+
+	val = bpf_get_stack(ctx, trace, sizeof(stack_trace_t), BPF_F_USER_STACK);
+	if (val > 0)
+		stack_user = 2;
+
+	return 0;
+}
+
+char LICENSE[] SEC("license") = "GPL";