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authorAlexei Starovoitov <ast@plumgrid.com>2015-10-20 20:02:34 -0700
committerDavid S. Miller <davem@davemloft.net>2015-10-22 06:42:15 -0700
commita43eec304259a6c637f4014a6d4767159b6a3aa3 (patch)
treeaecaeb92ff5263f446b002793d89a2a211dc246b /include/uapi
parentfa128e6a148a0a58355bd6814c6283515bbd028a (diff)
bpf: introduce bpf_perf_event_output() helper
This helper is used to send raw data from eBPF program into special PERF_TYPE_SOFTWARE/PERF_COUNT_SW_BPF_OUTPUT perf_event. User space needs to perf_event_open() it (either for one or all cpus) and store FD into perf_event_array (similar to bpf_perf_event_read() helper) before eBPF program can send data into it. Today the programs triggered by kprobe collect the data and either store it into the maps or print it via bpf_trace_printk() where latter is the debug facility and not suitable to stream the data. This new helper replaces such bpf_trace_printk() usage and allows programs to have dedicated channel into user space for post-processing of the raw data collected. Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/uapi')
-rw-r--r--include/uapi/linux/bpf.h11
-rw-r--r--include/uapi/linux/perf_event.h1
2 files changed, 12 insertions, 0 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h
index 564f1f091991..2e032426cfb7 100644
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -287,6 +287,17 @@ enum bpf_func_id {
* Return: realm if != 0
*/
BPF_FUNC_get_route_realm,
+
+ /**
+ * bpf_perf_event_output(ctx, map, index, data, size) - output perf raw sample
+ * @ctx: struct pt_regs*
+ * @map: pointer to perf_event_array map
+ * @index: index of event in the map
+ * @data: data on stack to be output as raw data
+ * @size: size of data
+ * Return: 0 on success
+ */
+ BPF_FUNC_perf_event_output,
__BPF_FUNC_MAX_ID,
};
diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 2881145cda86..d3c417615361 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -110,6 +110,7 @@ enum perf_sw_ids {
PERF_COUNT_SW_ALIGNMENT_FAULTS = 7,
PERF_COUNT_SW_EMULATION_FAULTS = 8,
PERF_COUNT_SW_DUMMY = 9,
+ PERF_COUNT_SW_BPF_OUTPUT = 10,
PERF_COUNT_SW_MAX, /* non-ABI */
};