From 45237f9898fce54a8cc6d40f7455291e0e6c4277 Mon Sep 17 00:00:00 2001
From: Masami Hiramatsu <mhiramat@kernel.org>
Date: Sat, 5 Jun 2021 01:28:43 +0900
Subject: [PATCH] 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>
---
tools/perf/builtin-probe.c | 12 +++++-
tools/perf/util/probe-event.c | 72 +++++++++++++++++++++++++++++++++++
tools/perf/util/probe-event.h | 2 +
3 files changed, 85 insertions(+), 1 deletion(-)
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 */
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 0412842faa18..c14e1d228e56 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -3564,6 +3564,78 @@ int show_probe_trace_events(struct perf_probe_event *pevs, int npevs)
return ret;
}
+static int show_bootconfig_event(struct probe_trace_event *tev)
+{
+ struct probe_trace_point *tp = &tev->point;
+ struct strbuf buf;
+ char *ret = NULL;
+ int err;
+
+ if (strbuf_init(&buf, 32) < 0)
+ return -ENOMEM;
+
+ err = synthesize_kprobe_trace_def(tp, &buf);
+ if (err >= 0)
+ err = synthesize_probe_trace_args(tev, &buf);
+ if (err >= 0)
+ ret = strbuf_detach(&buf, NULL);
+ strbuf_release(&buf);
+
+ if (ret) {
+ printf("'%s'", ret);
+ free(ret);
+ }
+
+ return err;
+}
+
+int show_bootconfig_events(struct perf_probe_event *pevs, int npevs)
+{
+ struct strlist *namelist = strlist__new(NULL, NULL);
+ struct probe_trace_event *tev;
+ struct perf_probe_event *pev;
+ char *cur_name = NULL;
+ int i, j, ret = 0;
+
+ if (!namelist)
+ return -ENOMEM;
+
+ for (j = 0; j < npevs && !ret; j++) {
+ pev = &pevs[j];
+ if (pev->group && strcmp(pev->group, "probe"))
+ pr_warning("WARN: Group name %s is ignored\n", pev->group);
+ if (pev->uprobes) {
+ pr_warning("ERROR: Bootconfig doesn't support uprobes\n");
+ ret = -EINVAL;
+ break;
+ }
+ for (i = 0; i < pev->ntevs && !ret; i++) {
+ tev = &pev->tevs[i];
+ /* Skip if the symbol is out of .text or blacklisted */
+ if (!tev->point.symbol && !pev->uprobes)
+ continue;
+
+ /* Set new name for tev (and update namelist) */
+ ret = probe_trace_event__set_name(tev, pev,
+ namelist, true);
+ if (ret)
+ break;
+
+ if (!cur_name || strcmp(cur_name, tev->event)) {
+ printf("%sftrace.event.kprobes.%s.probe = ",
+ cur_name ? "\n" : "", tev->event);
+ cur_name = tev->event;
+ } else
+ printf(", ");
+ ret = show_bootconfig_event(tev);
+ }
+ }
+ printf("\n");
+ strlist__delete(namelist);
+
+ return ret;
+}
+
int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs)
{
int i, ret = 0;
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index 4f0eb3a20c36..65769d7949a3 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -15,6 +15,7 @@ struct probe_conf {
bool force_add;
bool no_inlines;
bool cache;
+ bool bootconfig;
int max_probes;
unsigned long magic_num;
};
@@ -163,6 +164,7 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs);
int convert_perf_probe_events(struct perf_probe_event *pevs, int npevs);
int apply_perf_probe_events(struct perf_probe_event *pevs, int npevs);
int show_probe_trace_events(struct perf_probe_event *pevs, int npevs);
+int show_bootconfig_events(struct perf_probe_event *pevs, int npevs);
void cleanup_perf_probe_events(struct perf_probe_event *pevs, int npevs);
struct strfilter;