[PATCH 05/12] perf tools: Allow BPF program config probing options

[Wang Nan <wangnan0@huawei.com>]

By extending the syntax of BPF object section names, this patch allows
user to config probing options like what they can do in 'perf probe'.

Test result:

For following BPF file bpf.c:

 SEC("inlines=no\n"
     "func=SyS_dup?")
 int func(void *ctx)
 {
 	return 1;
 }

 Cmdline:

 # ./perf record  -e ./test_probe_glob.c ls /
 ...
 [ perf record: Woken up 1 times to write data ]
 [ perf record: Captured and wrote 0.013 MB perf.data ]
 # ./perf evlist
 perf_bpf_probe:func_1
 perf_bpf_probe:func

Change "inlines=no" to "inlines=yes":

Cmdline:

 # ./perf record  -e ./test_probe_glob.c ls /
 ...
 [ perf record: Woken up 2 times to write data ]
 [ perf record: Captured and wrote 0.013 MB perf.data ]
 # ./perf evlist
 perf_bpf_probe:func_3
 perf_bpf_probe:func_2
 perf_bpf_probe:func_1
 perf_bpf_probe:func

Signed-off-by: Wang Nan <wangnan0@huawei.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Cc: Zefan Li <lizefan@huawei.com>
Cc: pi3orama@163.com
---
 tools/perf/util/bpf-loader.c | 50 +++++++++++++++++++++++++++++++++++++++++++-
 tools/perf/util/config.c     |  9 ++++----
 tools/perf/util/util.c       | 18 ++++++++++++++++
 tools/perf/util/util.h       |  2 ++
 4 files changed, 74 insertions(+), 5 deletions(-)

diff --git a/tools/perf/util/bpf-loader.c b/tools/perf/util/bpf-loader.c
index 8d78785..a368ead 100644
--- a/tools/perf/util/bpf-loader.c
+++ b/tools/perf/util/bpf-loader.c
@@ -125,6 +125,38 @@ config__module(const char *value, struct perf_probe_event *pev)
 	return 0;
 }
 
+static int
+config__bool(const char *value,
+	     bool *pbool, bool invert)
+{
+	int err;
+	bool bool_value;
+
+	if (!pbool)
+		return -EINVAL;
+
+	err = convert_str_to_bool(value, &bool_value);
+	if (err)
+		return err;
+
+	*pbool = invert ? !bool_value : bool_value;
+	return 0;
+}
+
+static int
+config__inlines(const char *value,
+		struct perf_probe_event *pev __maybe_unused)
+{
+	return config__bool(value, &probe_conf.no_inlines, true);
+}
+
+static int
+config__force(const char *value,
+	      struct perf_probe_event *pev __maybe_unused)
+{
+	return config__bool(value, &probe_conf.force_add, false);
+}
+
 static struct {
 	const char *key;
 	const char *usage;
@@ -142,7 +174,19 @@ static struct {
 		"module=<module name>    ",
 		"Set kprobe module",
 		config__module,
-	}
+	},
+	{
+		"inlines",
+		"inlines=[yes|no]        ",
+		"Probe at inline symbol",
+		config__inlines,
+	},
+	{
+		"force",
+		"force=[yes|no]          ",
+		"Forcibly add events with existing name",
+		config__force,
+	},
 };
 
 static int
@@ -240,6 +284,10 @@ config_bpf_program(struct bpf_program *prog)
 	const char *config_str;
 	int err;
 
+	/* Initialize per-program probing setting */
+	probe_conf.no_inlines = false;
+	probe_conf.force_add = false;
+
 	config_str = bpf_program__title(prog, false);
 	if (IS_ERR(config_str)) {
 		pr_debug("bpf: unable to get title for program\n");
diff --git a/tools/perf/util/config.c b/tools/perf/util/config.c
index 2e452ac..8219798 100644
--- a/tools/perf/util/config.c
+++ b/tools/perf/util/config.c
@@ -351,15 +351,16 @@ int perf_config_int(const char *name, const char *value)
 
 static int perf_config_bool_or_int(const char *name, const char *value, int *is_bool)
 {
+	bool str_bool;
+
 	*is_bool = 1;
 	if (!value)
 		return 1;
 	if (!*value)
 		return 0;
-	if (!strcasecmp(value, "true") || !strcasecmp(value, "yes") || !strcasecmp(value, "on"))
-		return 1;
-	if (!strcasecmp(value, "false") || !strcasecmp(value, "no") || !strcasecmp(value, "off"))
-		return 0;
+
+	if (convert_str_to_bool(value, &str_bool) == 0)
+		return str_bool ? 1 : 0;
 	*is_bool = 0;
 	return perf_config_int(name, value);
 }
diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index 47b1e36..55785d5 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -695,3 +695,21 @@ fetch_kernel_version(unsigned int *puint, char *str,
 		*puint = (version << 16) + (patchlevel << 8) + sublevel;
 	return 0;
 }
+
+int convert_str_to_bool(const char *str, bool *result)
+{
+	if (!result || !str)
+		return -EINVAL;
+
+	if (!strcasecmp(str, "true") || !strcasecmp(str, "yes") || !strcasecmp(str, "on")) {
+		*result = true;
+		return 0;
+	}
+
+	if (!strcasecmp(str, "false") || !strcasecmp(str, "no") || !strcasecmp(str, "off")) {
+		*result = false;
+		return 0;
+	}
+
+	return -EINVAL;
+}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index dcc6590..be90932 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -358,4 +358,6 @@ int fetch_kernel_version(unsigned int *puint,
 #define KVER_FMT	"%d.%d.%d"
 #define KVER_PARAM(x)	KVER_VERSION(x), KVER_PATCHLEVEL(x), KVER_SUBLEVEL(x)
 
+int convert_str_to_bool(const char *str, bool *result);
+
 #endif /* GIT_COMPAT_UTIL_H */
-- 
1.8.3.4