This tests new helper function bpf_get_callchain_stackid(), which is the
alternative to bpf_get_stackid() for perf_event with PEBS entry.
Signed-off-by: Song Liu <songliubraving@xxxxxx>
---
.../bpf/prog_tests/callchain_stackid.c | 61 +++++++++++++++++++
.../selftests/bpf/progs/callchain_stackid.c | 37 +++++++++++
2 files changed, 98 insertions(+)
create mode 100644 tools/testing/selftests/bpf/prog_tests/callchain_stackid.c
create mode 100644 tools/testing/selftests/bpf/progs/callchain_stackid.c
diff --git a/tools/testing/selftests/bpf/prog_tests/callchain_stackid.c b/tools/testing/selftests/bpf/prog_tests/callchain_stackid.c
new file mode 100644
index 0000000000000..ebe6251324a1a
--- /dev/null
+++ b/tools/testing/selftests/bpf/prog_tests/callchain_stackid.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (c) 2020 Facebook
+#include <test_progs.h>
+#include "callchain_stackid.skel.h"
+
+void test_callchain_stackid(void)
+{
+ struct perf_event_attr attr = {
+ /* .type = PERF_TYPE_SOFTWARE, */
+ .type = PERF_TYPE_HARDWARE,
+ .config = PERF_COUNT_HW_CPU_CYCLES,
+ .precise_ip = 2,
+ .sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_BRANCH_STACK |
+ PERF_SAMPLE_CALLCHAIN,
+ .branch_sample_type = PERF_SAMPLE_BRANCH_USER |
+ PERF_SAMPLE_BRANCH_NO_FLAGS |
+ PERF_SAMPLE_BRANCH_NO_CYCLES |
+ PERF_SAMPLE_BRANCH_CALL_STACK,
+ .sample_period = 5000,
+ .size = sizeof(struct perf_event_attr),
+ };
+ struct callchain_stackid *skel;
+ __u32 duration = 0;
+ int pmu_fd, err;
+
+ skel = callchain_stackid__open();
+
+ if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
+ return;
+
+ /* override program type */
+ bpf_program__set_perf_event(skel->progs.oncpu);
+
+ err = callchain_stackid__load(skel);
+ if (CHECK(err, "skel_load", "skeleton load failed: %d\n", err))
+ goto cleanup;
+
+ pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
+ 0 /* cpu 0 */, -1 /* group id */,
+ 0 /* flags */);
+ if (pmu_fd < 0) {
+ printf("%s:SKIP:cpu doesn't support the event\n", __func__);
+ test__skip();
+ goto cleanup;
+ }
+
+ skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
+ pmu_fd);
+ if (CHECK(IS_ERR(skel->links.oncpu), "attach_perf_event",
+ "err %ld\n", PTR_ERR(skel->links.oncpu))) {
+ close(pmu_fd);
+ goto cleanup;
+ }
+ usleep(500000);
+
+ CHECK(skel->data->total_val == 1, "get_callchain_stack", "failed\n");
+ close(pmu_fd);
+
+cleanup:
+ callchain_stackid__destroy(skel);
+}
diff --git a/tools/testing/selftests/bpf/progs/callchain_stackid.c b/tools/testing/selftests/bpf/progs/callchain_stackid.c
new file mode 100644
index 0000000000000..aab2c736a0a45
--- /dev/null
+++ b/tools/testing/selftests/bpf/progs/callchain_stackid.c
@@ -0,0 +1,37 @@
+// 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
+
+#ifndef BPF_F_USER_STACK
+#define BPF_F_USER_STACK (1ULL << 8)
+#endif
+
+typedef __u64 stack_trace_t[PERF_MAX_STACK_DEPTH];
+struct {
+ __uint(type, BPF_MAP_TYPE_STACK_TRACE);
+ __uint(max_entries, 16384);
+ __uint(key_size, sizeof(__u32));
+ __uint(value_size, sizeof(stack_trace_t));
+} stackmap SEC(".maps");
+
+long total_val = 1;
+
+SEC("perf_event")
+int oncpu(struct bpf_perf_event_data *ctx)
+{
+ long val;
+
+ val = bpf_get_callchain_stackid(ctx->callchain, &stackmap, 0);
+
+ if (val > 0)
+ total_val += val;
+
+ return 0;
+}
+
+char LICENSE[] SEC("license") = "GPL";
--
2.24.1
