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@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: acme@kernel.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@kernel.org>

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 1ba7ca7..41c68d3 100644 (file)
--- 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,