linux-kernel - [tip:perf/urgent] perf/x86/intel/uncore: Allow only a single PMU/box within an events group

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Message-ID: <tip-033ac60c7f21f9996a0fab2fd04f334afbf77b33@git.kernel.org>
Date:   Tue, 22 Nov 2016 04:30:58 -0800
From:   tip-bot for Peter Zijlstra <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     alexander.shishkin@...ux.intel.com, vince@...ter.net,
        peterz@...radead.org, hpa@...or.com, vincent.weaver@...ne.edu,
        torvalds@...ux-foundation.org, eranian@...gle.com, acme@...hat.com,
        kan.liang@...el.com, linux-kernel@...r.kernel.org,
        jolsa@...hat.com, mingo@...nel.org, tglx@...utronix.de
Subject: [tip:perf/urgent] perf/x86/intel/uncore: Allow only a single
 PMU/box within an events group

Commit-ID:  033ac60c7f21f9996a0fab2fd04f334afbf77b33
Gitweb:     http://git.kernel.org/tip/033ac60c7f21f9996a0fab2fd04f334afbf77b33
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Fri, 18 Nov 2016 13:53:54 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 22 Nov 2016 12:36:59 +0100

perf/x86/intel/uncore: Allow only a single PMU/box within an events group

Group validation expects all events to be of the same PMU; however
is_uncore_pmu() is too wide, it matches _all_ uncore events, even
across PMUs.

This triggers failure when we group different events from different
uncore PMUs, like:

  perf stat -vv -e '{uncore_cbox_0/config=0x0334/,uncore_qpi_0/event=1/}' -a sleep 1

Fix is_uncore_pmu() by only matching events to the box at hand.

Note that generic code; ran after this step; will disallow this
mixture of PMU events.

Reported-by: Jiri Olsa <jolsa@...hat.com>
Tested-by: Jiri Olsa <jolsa@...hat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Kan Liang <kan.liang@...el.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Stephane Eranian <eranian@...gle.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vince Weaver <vince@...ter.net>
Cc: Vince Weaver <vincent.weaver@...ne.edu>
Link: http://lkml.kernel.org/r/20161118125354.GQ3117@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/events/intel/uncore.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index efca268..dbaaf7dc 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -319,9 +319,9 @@ static struct intel_uncore_box *uncore_alloc_box(struct intel_uncore_type *type,
  */
 static int uncore_pmu_event_init(struct perf_event *event);
 
-static bool is_uncore_event(struct perf_event *event)
+static bool is_box_event(struct intel_uncore_box *box, struct perf_event *event)
 {
-	return event->pmu->event_init == uncore_pmu_event_init;
+	return &box->pmu->pmu == event->pmu;
 }
 
 static int
@@ -340,7 +340,7 @@ uncore_collect_events(struct intel_uncore_box *box, struct perf_event *leader,
 
 	n = box->n_events;
 
-	if (is_uncore_event(leader)) {
+	if (is_box_event(box, leader)) {
 		box->event_list[n] = leader;
 		n++;
 	}
@@ -349,7 +349,7 @@ uncore_collect_events(struct intel_uncore_box *box, struct perf_event *leader,
 		return n;
 
 	list_for_each_entry(event, &leader->sibling_list, group_entry) {
-		if (!is_uncore_event(event) ||
+		if (!is_box_event(box, event) ||
 		    event->state <= PERF_EVENT_STATE_OFF)
 			continue;