linux-kernel - [tip:perf/core] libperf: Add debug output support

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Date:   Tue, 30 Jul 2019 11:27:11 -0700
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     hpa@...or.com, mpetlan@...hat.com, jolsa@...nel.org,
        alexander.shishkin@...ux.intel.com, peterz@...radead.org,
        ak@...ux.intel.com, namhyung@...nel.org,
        alexey.budankov@...ux.intel.com, tglx@...utronix.de,
        mingo@...nel.org, linux-kernel@...r.kernel.org, acme@...hat.com
Subject: [tip:perf/core] libperf: Add debug output support

Commit-ID:  a1556f8479ed58b8d5a33aef54578bad0165c7e7
Gitweb:     https://git.kernel.org/tip/a1556f8479ed58b8d5a33aef54578bad0165c7e7
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Sun, 21 Jul 2019 13:24:14 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 29 Jul 2019 18:34:44 -0300

libperf: Add debug output support

Add the perf_set_print() function to allow setting an output function
for warn/info/debug messages.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc: Andi Kleen <ak@...ux.intel.com>
Cc: Michael Petlan <mpetlan@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20190721112506.12306-28-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/lib/core.c              | 34 ++++++++++++++++++++++++++++++++++
 tools/perf/lib/include/perf/core.h | 13 +++++++++++++
 tools/perf/lib/internal.h          | 18 ++++++++++++++++++
 tools/perf/lib/libperf.map         |  2 ++
 4 files changed, 67 insertions(+)

diff --git a/tools/perf/lib/core.c b/tools/perf/lib/core.c
index e69de29bb2d1..29d5e3348718 100644
--- a/tools/perf/lib/core.c
+++ b/tools/perf/lib/core.c
@@ -0,0 +1,34 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#define __printf(a, b)  __attribute__((format(printf, a, b)))
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <perf/core.h>
+#include "internal.h"
+
+static int __base_pr(enum libperf_print_level level, const char *format,
+		     va_list args)
+{
+	return vfprintf(stderr, format, args);
+}
+
+static libperf_print_fn_t __libperf_pr = __base_pr;
+
+void libperf_set_print(libperf_print_fn_t fn)
+{
+	__libperf_pr = fn;
+}
+
+__printf(2, 3)
+void libperf_print(enum libperf_print_level level, const char *format, ...)
+{
+	va_list args;
+
+	if (!__libperf_pr)
+		return;
+
+	va_start(args, format);
+	__libperf_pr(level, format, args);
+	va_end(args);
+}
diff --git a/tools/perf/lib/include/perf/core.h b/tools/perf/lib/include/perf/core.h
index e2e4b43c9131..c341a7b2c874 100644
--- a/tools/perf/lib/include/perf/core.h
+++ b/tools/perf/lib/include/perf/core.h
@@ -2,8 +2,21 @@
 #ifndef __LIBPERF_CORE_H
 #define __LIBPERF_CORE_H
 
+#include <stdarg.h>
+
 #ifndef LIBPERF_API
 #define LIBPERF_API __attribute__((visibility("default")))
 #endif
 
+enum libperf_print_level {
+	LIBPERF_WARN,
+	LIBPERF_INFO,
+	LIBPERF_DEBUG,
+};
+
+typedef int (*libperf_print_fn_t)(enum libperf_print_level level,
+				  const char *, va_list ap);
+
+LIBPERF_API void libperf_set_print(libperf_print_fn_t fn);
+
 #endif /* __LIBPERF_CORE_H */
diff --git a/tools/perf/lib/internal.h b/tools/perf/lib/internal.h
new file mode 100644
index 000000000000..dc92f241732e
--- /dev/null
+++ b/tools/perf/lib/internal.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LIBPERF_INTERNAL_H
+#define __LIBPERF_INTERNAL_H
+
+void libperf_print(enum libperf_print_level level,
+		   const char *format, ...)
+	__attribute__((format(printf, 2, 3)));
+
+#define __pr(level, fmt, ...)   \
+do {                            \
+	libperf_print(level, "libperf: " fmt, ##__VA_ARGS__);     \
+} while (0)
+
+#define pr_warning(fmt, ...)    __pr(LIBPERF_WARN, fmt, ##__VA_ARGS__)
+#define pr_info(fmt, ...)       __pr(LIBPERF_INFO, fmt, ##__VA_ARGS__)
+#define pr_debug(fmt, ...)      __pr(LIBPERF_DEBUG, fmt, ##__VA_ARGS__)
+
+#endif /* __LIBPERF_INTERNAL_H */
diff --git a/tools/perf/lib/libperf.map b/tools/perf/lib/libperf.map
index a8e913988edf..3536242c545c 100644
--- a/tools/perf/lib/libperf.map
+++ b/tools/perf/lib/libperf.map
@@ -1,4 +1,6 @@
 LIBPERF_0.0.1 {
+	global:
+		libperf_set_print;
 	local:
 		*;
 };