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-rw-r--r--tools/testing/selftests/bpf/progs/test_perf_branches.c50
1 files changed, 50 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/test_perf_branches.c b/tools/testing/selftests/bpf/progs/test_perf_branches.c
new file mode 100644
index 000000000..a1ccc831c
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/test_perf_branches.c
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2019 Facebook
+
+#include <stddef.h>
+#include <linux/ptrace.h>
+#include <linux/bpf.h>
+#include <bpf/bpf_helpers.h>
+#include <bpf/bpf_tracing.h>
+
+int valid = 0;
+int required_size_out = 0;
+int written_stack_out = 0;
+int written_global_out = 0;
+
+struct {
+ __u64 _a;
+ __u64 _b;
+ __u64 _c;
+} fpbe[30] = {0};
+
+SEC("perf_event")
+int perf_branches(void *ctx)
+{
+ __u64 entries[4 * 3] = {0};
+ int required_size, written_stack, written_global;
+
+ /* write to stack */
+ written_stack = bpf_read_branch_records(ctx, entries, sizeof(entries), 0);
+ /* ignore spurious events */
+ if (!written_stack)
+ return 1;
+
+ /* get required size */
+ required_size = bpf_read_branch_records(ctx, NULL, 0,
+ BPF_F_GET_BRANCH_RECORDS_SIZE);
+
+ written_global = bpf_read_branch_records(ctx, fpbe, sizeof(fpbe), 0);
+ /* ignore spurious events */
+ if (!written_global)
+ return 1;
+
+ required_size_out = required_size;
+ written_stack_out = written_stack;
+ written_global_out = written_global;
+ valid = 1;
+
+ return 0;
+}
+
+char _license[] SEC("license") = "GPL";