This patchset adds PMU driver specific configuration to the parser
infrastructure by preceding any term with the '@' letter.  As such
doing something like:

perf record -e some_event/@cfg1, at cfg2=config/ ...

will see 'cfg1' and 'cfg2=config' being added to the list of evsel config
terms.  Token 'cfg1' and 'cfg2=config' are not processed in user space
and are meant to be interpreted by the PMU driver.

First the lexer/parser are supplemented with the required definitions to
recognise the driver specific configuration.  From there they are simply
added to the list of event terms.  The bulk of the work is done in
function "parse_events_add_pmu()" where driver config event terms are
added to a new list of driver config terms, which in turn spliced with
the event's new driver configuration list.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
---
 tools/perf/util/evsel.c        |  1 +
 tools/perf/util/evsel.h        |  4 +++
 tools/perf/util/parse-events.c | 67 +++++++++++++++++++++++++++++++-----------
 tools/perf/util/parse-events.h |  1 +
 tools/perf/util/parse-events.l | 12 ++++++++
 tools/perf/util/parse-events.y | 11 +++++++
 6 files changed, 79 insertions(+), 17 deletions(-)

diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 5d7037ef7d3b..7f97bae594ff 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c

@@ -213,6 +213,7 @@ void perf_evsel__init(struct perf_evsel *evsel,
 	evsel->bpf_fd	   = -1;
 	INIT_LIST_HEAD(&evsel->node);
 	INIT_LIST_HEAD(&evsel->config_terms);
+	INIT_LIST_HEAD(&evsel->drv_config_terms);
 	perf_evsel__object.init(evsel);
 	evsel->sample_size = __perf_evsel__sample_size(attr->sample_type);
 	perf_evsel__calc_id_pos(evsel);

diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index c1f10159804c..0441be00a366 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h

@@ -44,6 +44,7 @@ enum {
 	PERF_EVSEL__CONFIG_TERM_CALLGRAPH,
 	PERF_EVSEL__CONFIG_TERM_STACK_USER,
 	PERF_EVSEL__CONFIG_TERM_INHERIT,
+	PERF_EVSEL__CONFIG_TERM_DRV_CFG,
 	PERF_EVSEL__CONFIG_TERM_MAX,