perf probe: Add --bootconfig to output definition in bootconfig format

Now the boot-time tracing supports kprobes events and that must be
written in bootconfig file in the following format.

  ftrace.event.kprobes.<EVENT_NAME>.probes = <PROBE-DEF>

'perf probe' already supports --definition (-D) action to show probe
definitions, but the format is for tracefs:

  [p|r][:EVENT_NAME] <PROBE-DEF>

This patch adds the --bootconfig option for -D action so that it outputs
the probe definitions in bootconfig format. E.g.

  $ perf probe --bootconfig -D "path_lookupat:7 err:s32 s:string"
  ftrace.event.kprobes.path_lookupat_L7.probe = 'path_lookupat.isra.0+309 err_s32=%ax:s32 s_string=+0(%r13):string'

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/162282412351.452340.14871995440005640114.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 11 insertions, 1 deletions

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 6b1507566770..2bfd41df621c 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -347,7 +347,10 @@ static int perf_add_probe_events(struct perf_probe_event *pevs, int npevs)
 		goto out_cleanup;
 
 	if (params.command == 'D') {	/* it shows definition */
-		ret = show_probe_trace_events(pevs, npevs);
+		if (probe_conf.bootconfig)
+			ret = show_bootconfig_events(pevs, npevs);
+		else
+			ret = show_probe_trace_events(pevs, npevs);
 		goto out_cleanup;
 	}
 
@@ -581,6 +584,8 @@ __cmd_probe(int argc, const char **argv)
 		   "Look for files with symbols relative to this directory"),
 	OPT_CALLBACK(0, "target-ns", NULL, "pid",
 		     "target pid for namespace contexts", opt_set_target_ns),
+	OPT_BOOLEAN(0, "bootconfig", &probe_conf.bootconfig,
+		    "Output probe definition with bootconfig format"),
 	OPT_END()
 	};
 	int ret;
@@ -692,6 +697,11 @@ __cmd_probe(int argc, const char **argv)
 		}
 		break;
 	case 'D':
+		if (probe_conf.bootconfig && params.uprobes) {
+			pr_err("  Error: --bootconfig doesn't support uprobes.\n");
+			return -EINVAL;
+		}
+		__fallthrough;
 	case 'a':
 
 		/* Ensure the last given target is used */