linux-kernel - [PATCH 9/9] perf tools: The buildid usage in example eBPF program

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Message-Id: <20180405151645.19130-10-jolsa@kernel.org>
Date:   Thu,  5 Apr 2018 17:16:45 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Cc:     lkml <linux-kernel@...r.kernel.org>, netdev@...r.kernel.org,
        linux-kbuild@...r.kernel.org,
        Quentin Monnet <quentin.monnet@...ronome.com>,
        Eugene Syromiatnikov <esyr@...hat.com>,
        Jiri Benc <jbenc@...hat.com>,
        Stanislav Kozina <skozina@...hat.com>,
        Jerome Marchand <jmarchan@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Jiri Kosina <jkosina@...e.cz>
Subject: [PATCH 9/9] perf tools: The buildid usage in example eBPF program

The bpf-samples/bpf-stdout-example.c demonstrates how to put the
buildid data into eBPF program.

Link: http://lkml.kernel.org/n/tip-dq97ddil7h3qbvphbbo8p08c@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/perf/bpf-samples/bpf-stdout-example.c | 42 +++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)
 create mode 100644 tools/perf/bpf-samples/bpf-stdout-example.c

diff --git a/tools/perf/bpf-samples/bpf-stdout-example.c b/tools/perf/bpf-samples/bpf-stdout-example.c
new file mode 100644
index 000000000000..60783442bd5c
--- /dev/null
+++ b/tools/perf/bpf-samples/bpf-stdout-example.c
@@ -0,0 +1,42 @@
+#include <uapi/linux/bpf.h>
+#include <linux/buildid.h>
+
+#define SEC(NAME) __attribute__((section(NAME), used))
+
+char _license[] SEC("license") = "GPL";
+int _version    SEC("version") = LINUX_VERSION_CODE;
+char _buildid[] SEC("buildid") = LINUX_BUILDID_DATA;
+
+static unsigned long long (*bpf_get_smp_processor_id)(void) =
+	(void *) BPF_FUNC_get_smp_processor_id;
+static int (*bpf_perf_event_output)(void *ctx, void *map,
+                                    unsigned long long flags, void *data,
+                                    int size) =
+        (void *) BPF_FUNC_perf_event_output;
+
+struct bpf_map_def {
+        unsigned int type;
+        unsigned int key_size;
+        unsigned int value_size;
+        unsigned int max_entries;
+        unsigned int map_flags;
+        unsigned int inner_map_idx;
+        unsigned int numa_node;
+};
+
+struct bpf_map_def SEC("maps") __bpf_stdout__ = {
+	.type		= BPF_MAP_TYPE_PERF_EVENT_ARRAY,
+	.key_size	= sizeof(int),
+	.value_size	= sizeof(u32),
+	.max_entries	= __NR_CPUS__,
+};
+
+SEC("probe=sys_read")
+int func(void *ctx)
+{
+	char output_str[] = "Raise a BPF event!";
+
+	bpf_perf_event_output(ctx, &__bpf_stdout__, bpf_get_smp_processor_id(),
+			      &output_str, sizeof(output_str));
+	return 0;
+}
-- 
2.13.6