linux-kernel - [tip:perf/core] perf/x86/intel: Fix PMU read for auto-reload

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Date:   Fri, 9 Mar 2018 01:10:14 -0800
From:   tip-bot for Kan Liang <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     vincent.weaver@...ne.edu, kan.liang@...ux.intel.com,
        alexander.shishkin@...ux.intel.com, mingo@...nel.org,
        eranian@...gle.com, acme@...hat.com, jolsa@...hat.com,
        peterz@...radead.org, linux-kernel@...r.kernel.org, hpa@...or.com,
        torvalds@...ux-foundation.org, tglx@...utronix.de
Subject: [tip:perf/core] perf/x86/intel: Fix PMU read for auto-reload

Commit-ID:  ceb90d9e0248947839a0ff4bee98cf28695a6020
Gitweb:     https://git.kernel.org/tip/ceb90d9e0248947839a0ff4bee98cf28695a6020
Author:     Kan Liang <kan.liang@...ux.intel.com>
AuthorDate: Mon, 12 Feb 2018 14:20:34 -0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 9 Mar 2018 08:22:22 +0100

perf/x86/intel: Fix PMU read for auto-reload

Auto-reload events needs to be specially handled in event count read.

Auto-reload is only available for intel_pmu.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.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: Jiri Olsa <jolsa@...hat.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 <vincent.weaver@...ne.edu>
Cc: acme@...nel.org
Fixes: b8241d20699e ("perf/x86/intel: Implement batched PEBS interrupt handling (large PEBS interrupt threshold)")
Link: http://lkml.kernel.org/r/1518474035-21006-5-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/events/intel/core.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 1ba7ca7b675d..41c68d337e84 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -2060,6 +2060,14 @@ static void intel_pmu_del_event(struct perf_event *event)
 		intel_pmu_pebs_del(event);
 }
 
+static void intel_pmu_read_event(struct perf_event *event)
+{
+	if (event->hw.flags & PERF_X86_EVENT_AUTO_RELOAD)
+		intel_pmu_auto_reload_read(event);
+	else
+		x86_perf_event_update(event);
+}
+
 static void intel_pmu_enable_fixed(struct hw_perf_event *hwc)
 {
 	int idx = hwc->idx - INTEL_PMC_IDX_FIXED;
@@ -3503,6 +3511,7 @@ static __initconst const struct x86_pmu intel_pmu = {
 	.disable		= intel_pmu_disable_event,
 	.add			= intel_pmu_add_event,
 	.del			= intel_pmu_del_event,
+	.read			= intel_pmu_read_event,
 	.hw_config		= intel_pmu_hw_config,
 	.schedule_events	= x86_schedule_events,
 	.eventsel		= MSR_ARCH_PERFMON_EVENTSEL0,