[PATCH v25 02/16] trace-cmd: Add trace-cmd library APIs for ftrace clock name

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>]

Added enum with ftrace clock IDs and APIs to convert ftrace name to ID
and vice versa, as part of libtracecmd. The clock items in the enum are
organized as a bitmask, as it will be used by the timestamp
synchronization protocol to declare supported ftrace clocks.

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 include/trace-cmd/trace-cmd.h | 16 +++++++++++
 lib/trace-cmd/trace-util.c    | 52 +++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)

diff --git a/include/trace-cmd/trace-cmd.h b/include/trace-cmd/trace-cmd.h
index 8d3bea73..b48381cd 100644
--- a/include/trace-cmd/trace-cmd.h
+++ b/include/trace-cmd/trace-cmd.h
@@ -411,6 +411,22 @@ int tracecmd_msg_recv_time_sync(struct tracecmd_msg_handle *msg_handle,
 				unsigned int *sync_msg_id,
 				unsigned int *payload_size, char **payload);
 
+enum tracecmd_clocks {
+	TRACECMD_CLOCK_UNKNOWN	= 0,
+	TRACECMD_CLOCK_LOCAL	= 1,
+	TRACECMD_CLOCK_GLOBAL	= 1 << 1,
+	TRACECMD_CLOCK_COUNTER	= 1 << 2,
+	TRACECMD_CLOCK_UPTIME	= 1 << 3,
+	TRACECMD_CLOCK_PERF	= 1 << 4,
+	TRACECMD_CLOCK_MONO	= 1 << 5,
+	TRACECMD_CLOCK_MONO_RAW	= 1 << 6,
+	TRACECMD_CLOCK_BOOT	= 1 << 7,
+	TRACECMD_CLOCK_X86_TSC	= 1 << 8
+};
+
+enum tracecmd_clocks tracecmd_clock_str2id(const char *clock);
+const char *tracecmd_clock_id2str(enum tracecmd_clocks clock);
+
 /* --- Timestamp synchronization --- */
 
 #define TRACECMD_TSYNC_PNAME_LENGTH	16
diff --git a/lib/trace-cmd/trace-util.c b/lib/trace-cmd/trace-util.c
index 0ead96ea..524e3309 100644
--- a/lib/trace-cmd/trace-util.c
+++ b/lib/trace-cmd/trace-util.c
@@ -33,6 +33,58 @@ static bool debug;
 
 static FILE *logfp;
 
+const static struct {
+	const char *clock_str;
+	enum tracecmd_clocks clock_id;
+} trace_clocks[] = {
+	{"local", TRACECMD_CLOCK_LOCAL},
+	{"global", TRACECMD_CLOCK_GLOBAL},
+	{"counter", TRACECMD_CLOCK_COUNTER},
+	{"uptime", TRACECMD_CLOCK_UPTIME},
+	{"perf", TRACECMD_CLOCK_PERF},
+	{"mono", TRACECMD_CLOCK_MONO},
+	{"mono_raw", TRACECMD_CLOCK_MONO_RAW},
+	{"boot", TRACECMD_CLOCK_BOOT},
+	{"x86-tsc", TRACECMD_CLOCK_X86_TSC},
+	{NULL, -1}
+};
+
+/**
+ * tracecmd_clock_str2id - Convert ftrace clock name to clock ID
+ * @clock: Ftrace clock name
+ * Returns ID of the ftrace clock
+ */
+enum tracecmd_clocks tracecmd_clock_str2id(const char *clock)
+{
+	int i;
+
+	if (!clock)
+		return TRACECMD_CLOCK_UNKNOWN;
+
+	for (i = 0; trace_clocks[i].clock_str; i++) {
+		if (!strncmp(clock, trace_clocks[i].clock_str,
+		    strlen(trace_clocks[i].clock_str)))
+			return trace_clocks[i].clock_id;
+	}
+	return TRACECMD_CLOCK_UNKNOWN;
+}
+
+/**
+ * tracecmd_clock_id2str - Convert clock ID to ftare clock name
+ * @clock: Clock ID
+ * Returns name of a ftrace clock
+ */
+const char *tracecmd_clock_id2str(enum tracecmd_clocks clock)
+{
+	int i;
+
+	for (i = 0; trace_clocks[i].clock_str; i++) {
+		if (trace_clocks[i].clock_id == clock)
+			return trace_clocks[i].clock_str;
+	}
+	return NULL;
+}
+
 /**
  * tracecmd_set_debug - Set debug mode of the tracecmd library
  * @set_debug: The new "debug" mode. If true, the tracecmd library is
-- 
2.26.2