linux-kernel - [PATCH 28/34] tools, perf: Add a precise event qualifier

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Date:	Thu, 18 Oct 2012 16:19:36 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	a.p.zijlstra@...llo.nl
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org, acme@...hat.com,
	eranian@...gle.com, Andi Kleen <ak@...ux.intel.com>
Subject: [PATCH 28/34] tools, perf: Add a precise event qualifier

From: Andi Kleen <ak@...ux.intel.com>

Add a precise qualifier, like cpu/event=0x3c,precise=1/

This is needed so that the kernel can request enabling PEBS
for TSX events. The parser bails out on any sysfs parse errors,
so this is needed in any case to handle any event on the TSX
perf kernel.

Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 tools/perf/util/parse-events.c |    6 ++++++
 tools/perf/util/parse-events.h |    1 +
 tools/perf/util/parse-events.l |    1 +
 3 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 401b088..de1cb9e 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -526,6 +526,12 @@ do {								\
 	case PARSE_EVENTS__TERM_TYPE_NAME:
 		CHECK_TYPE_VAL(STR);
 		break;
+	case PARSE_EVENTS__TERM_TYPE_PRECISE:
+		CHECK_TYPE_VAL(NUM);
+		if ((unsigned)term->val.num > 2)
+			return -EINVAL;
+		attr->precise_ip = term->val.num;
+		break;
 	default:
 		return -EINVAL;
 	}
diff --git a/tools/perf/util/parse-events.h b/tools/perf/util/parse-events.h
index 839230c..0c78bb8 100644
--- a/tools/perf/util/parse-events.h
+++ b/tools/perf/util/parse-events.h
@@ -49,6 +49,7 @@ enum {
 	PARSE_EVENTS__TERM_TYPE_NAME,
 	PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD,
 	PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE,
+	PARSE_EVENTS__TERM_TYPE_PRECISE,
 };
 
 struct parse_events__term {
diff --git a/tools/perf/util/parse-events.l b/tools/perf/util/parse-events.l
index ef602f0..c2e5142 100644
--- a/tools/perf/util/parse-events.l
+++ b/tools/perf/util/parse-events.l
@@ -168,6 +168,7 @@ period			{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD); }
 branch_type		{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE); }
 ,			{ return ','; }
 "/"			{ BEGIN(INITIAL); return '/'; }
+precise			{ return term(yyscanner, PARSE_EVENTS__TERM_TYPE_PRECISE); }
 }
 
 mem:			{ BEGIN(mem); return PE_PREFIX_MEM; }
-- 
1.7.7.6

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