perf tools: Add support to specify hw event as PMU event term

Add a way to specify hw event as PMU event term like:

 'cpu/event=cpu-cycles/u'
 'cpu/event=instructions,.../u'
 'cpu/cycles,.../u'

The 'event=cpu-cycles' term is replaced/translated by the hw events
term translation, which is exposed by sysfs 'events' group attribute.

Add parser bits, the rest is already handled by the PMU alias code.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1349873598-12583-8-git-send-email-jolsa@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

tools/perf/util/parse-events.c

@@ -1142,6 +1142,24 @@ int parse_events__term_str(struct parse_events__term **term,
 			config, str, 0);
 }
 
+int parse_events__term_sym_hw(struct parse_events__term **term,
+			      char *config, unsigned idx)
+{
+	struct event_symbol *sym;
+
+	BUG_ON(idx >= PERF_COUNT_HW_MAX);
+	sym = &event_symbols_hw[idx];
+
+	if (config)
+		return new_term(term, PARSE_EVENTS__TERM_TYPE_STR,
+				PARSE_EVENTS__TERM_TYPE_USER, config,
+				(char *) sym->symbol, 0);
+	else
+		return new_term(term, PARSE_EVENTS__TERM_TYPE_STR,
+				PARSE_EVENTS__TERM_TYPE_USER,
+				(char *) "event", (char *) sym->symbol, 0);
+}
+
 int parse_events__term_clone(struct parse_events__term **new,
 			     struct parse_events__term *term)
 {

tools/perf/util/parse-events.h

@@ -76,6 +76,8 @@ int parse_events__term_num(struct parse_events__term **_term,
 			   int type_term, char *config, u64 num);
 int parse_events__term_str(struct parse_events__term **_term,
 			   int type_term, char *config, char *str);
+int parse_events__term_sym_hw(struct parse_events__term **term,
+			      char *config, unsigned idx);
 int parse_events__term_clone(struct parse_events__term **new,
 			     struct parse_events__term *term);
 void parse_events__free_terms(struct list_head *terms);

tools/perf/util/parse-events.y

@@ -352,6 +352,15 @@ PE_NAME '=' PE_VALUE
 	$$ = term;
 }
 |
+PE_NAME '=' PE_VALUE_SYM_HW
+{
+	struct parse_events__term *term;
+	int config = $3 & 255;
+
+	ABORT_ON(parse_events__term_sym_hw(&term, $1, config));
+	$$ = term;
+}
+|
 PE_NAME
 {
 	struct parse_events__term *term;
@@ -361,6 +370,15 @@ PE_NAME
 	$$ = term;
 }
 |
+PE_VALUE_SYM_HW
+{
+	struct parse_events__term *term;
+	int config = $1 & 255;
+
+	ABORT_ON(parse_events__term_sym_hw(&term, NULL, config));
+	$$ = term;
+}
+|
 PE_TERM '=' PE_NAME
 {
 	struct parse_events__term *term;