From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932862AbeBLWWV (ORCPT ); Mon, 12 Feb 2018 17:22:21 -0500 Received: from mga07.intel.com ([134.134.136.100]:64302 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932730AbeBLWVv (ORCPT ); Mon, 12 Feb 2018 17:21:51 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.46,504,1511856000"; d="scan'208";a="29490600" From: kan.liang@linux.intel.com To: peterz@infradead.org, mingo@redhat.com, linux-kernel@vger.kernel.org Cc: acme@kernel.org, tglx@linutronix.de, jolsa@redhat.com, eranian@google.com, ak@linux.intel.com, Kan Liang Subject: [PATCH V4 3/5] perf/x86/intel/ds: Introduce read function for auto-reload event Date: Mon, 12 Feb 2018 14:20:33 -0800 Message-Id: <1518474035-21006-4-git-send-email-kan.liang@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1518474035-21006-1-git-send-email-kan.liang@linux.intel.com> References: <1518474035-21006-1-git-send-email-kan.liang@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Kan Liang There is no way to get exact auto-reload times and value which needed for event update unless flush the PEBS buffer. Introduce intel_pmu_auto_reload_read() to drain the PEBS buffer for auto reload event. To prevent the race, the drain_pebs() only be called when the PMU is disabled. Signed-off-by: Kan Liang --- arch/x86/events/intel/ds.c | 9 +++++++++ arch/x86/events/perf_event.h | 2 ++ 2 files changed, 11 insertions(+) diff --git a/arch/x86/events/intel/ds.c b/arch/x86/events/intel/ds.c index f519ebc..406f3ba 100644 --- a/arch/x86/events/intel/ds.c +++ b/arch/x86/events/intel/ds.c @@ -1303,6 +1303,15 @@ get_next_pebs_record_by_bit(void *base, void *top, int bit) return NULL; } +void intel_pmu_auto_reload_read(struct perf_event *event) +{ + WARN_ON(!(event->hw.flags & PERF_X86_EVENT_AUTO_RELOAD)); + + perf_pmu_disable(event->pmu); + intel_pmu_drain_pebs_buffer(); + perf_pmu_enable(event->pmu); +} + /* * Special variant of intel_pmu_save_and_restart() for auto-reload. */ diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h index 805400b..f4720a9 100644 --- a/arch/x86/events/perf_event.h +++ b/arch/x86/events/perf_event.h @@ -923,6 +923,8 @@ void intel_pmu_pebs_disable_all(void); void intel_pmu_pebs_sched_task(struct perf_event_context *ctx, bool sched_in); +void intel_pmu_auto_reload_read(struct perf_event *event); + void intel_ds_init(void); void intel_pmu_lbr_sched_task(struct perf_event_context *ctx, bool sched_in); -- 2.7.4