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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/testing/selftests/bpf/progs/test_perf_branches.c | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/testing/selftests/bpf/progs/test_perf_branches.c')
-rw-r--r-- | tools/testing/selftests/bpf/progs/test_perf_branches.c | 50 |
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"; |