These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / samples / bpf / trace_output_kern.c

diff --git a/kernel/samples/bpf/trace_output_kern.c b/kernel/samples/bpf/trace_output_kern.c
new file mode 100644 (file)
index 0000000..8d8d1ec
--- /dev/null
+++ b/kernel/samples/bpf/trace_output_kern.c
@@ -0,0 +1,31 @@
+#include <linux/ptrace.h>
+#include <linux/version.h>
+#include <uapi/linux/bpf.h>
+#include "bpf_helpers.h"
+
+struct bpf_map_def SEC("maps") my_map = {
+       .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY,
+       .key_size = sizeof(int),
+       .value_size = sizeof(u32),
+       .max_entries = 2,
+};
+
+SEC("kprobe/sys_write")
+int bpf_prog1(struct pt_regs *ctx)
+{
+       struct S {
+               u64 pid;
+               u64 cookie;
+       } data;
+
+       memset(&data, 0, sizeof(data));
+       data.pid = bpf_get_current_pid_tgid();
+       data.cookie = 0x12345678;
+
+       bpf_perf_event_output(ctx, &my_map, 0, &data, sizeof(data));
+
+       return 0;
+}
+
+char _license[] SEC("license") = "GPL";
+u32 _version SEC("version") = LINUX_VERSION_CODE;