perf tools: Add config options support for event parsing

Adding a new rule to the event grammar to be able to specify
values of additional attributes of symbolic event.

The new syntax for event symbolic definition is:

event_legacy_symbol:  PE_NAME_SYM '/' event_config '/' |
                      PE_NAME_SYM sep_slash_dc

event_config:         event_config ',' event_term | event_term

event_term:           PE_NAME '=' PE_NAME |
                      PE_NAME '=' PE_VALUE
                      PE_NAME

sep_slash_dc: '/' | ':' |

At the moment the config options are hardcoded to be used for legacy
symbol events to define several perf_event_attr fields. It is:

  'config'   to define perf_event_attr::config
  'config1'  to define perf_event_attr::config1
  'config2'  to define perf_event_attr::config2
  'period'   to define perf_event_attr::sample_period

Legacy events could be now specified as:
  cycles/period=100000/

If term is specified without the value assignment, then 1 is
assigned by default.

Acked-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/n/tip-mgkavww9790jbt2jdkooyv4q@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index 44dbc359f0a..ab9eca120fe 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -5,6 +5,7 @@
 #include <errno.h>
 #include "../perf.h"
 #include "parse-events-bison.h"
+#include "parse-events.h"
 
 static int __value(char *str, int base, int token)
 {
@@ -41,6 +42,12 @@ static int sym(int type, int config)
         return PE_VALUE_SYM;
 }
 
+static int term(int type)
+{
+        parse_events_lval.num = type;
+        return PE_TERM;
+}
+
 %}
 
 num_dec         [0-9]+
@@ -85,6 +92,18 @@ speculative-read|speculative-load	|
 refs|Reference|ops|access               |
 misses|miss                             { return str(PE_NAME_CACHE_OP_RESULT); }
 
+        /*
+         * These are event config hardcoded term names to be specified
+         * within xxx/.../ syntax. So far we dont clash with other names,
+         * so we can put them here directly. In case the we have a conflict
+         * in future, this needs to go into '//' condition block.
+         */
+config                  { return term(PARSE_EVENTS__TERM_TYPE_CONFIG); }
+config1                 { return term(PARSE_EVENTS__TERM_TYPE_CONFIG1); }
+config2                 { return term(PARSE_EVENTS__TERM_TYPE_CONFIG2); }
+period                  { return term(PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD); }
+branch_type             { return term(PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE); }
+
 mem:                    { return PE_PREFIX_MEM; }
 r{num_raw_hex}          { return raw(); }
 {num_dec}               { return value(10); }