perf/x86: Add 3 new scheduling callbacks

This patch adds 3 new PMU model specific callbacks
during the event scheduling done by x86_schedule_events().

  ->start_scheduling():  invoked when entering the schedule routine.
  ->stop_scheduling():   invoked at the end of the schedule routine
  ->commit_scheduling(): invoked for each committed event

To be used optionally by model-specific code.

Signed-off-by: Maria Dimakopoulou <maria.n.dimakopoulou@gmail.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Stephane Eranian <eranian@google.com>
Cc: bp@alien8.de
Cc: jolsa@redhat.com
Cc: kan.liang@intel.com
Link: http://lkml.kernel.org/r/1416251225-17721-4-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

2 files changed, 18 insertions, 0 deletions

diff --git a/arch/x86/kernel/cpu/perf_event.c b/arch/x86/kernel/cpu/perf_event.c
index 682ef00727e7..cd6115867fb8 100644
--- a/arch/x86/kernel/cpu/perf_event.c
+++ b/arch/x86/kernel/cpu/perf_event.c
@@ -784,6 +784,9 @@ int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign)
 
         bitmap_zero(used_mask, X86_PMC_IDX_MAX);
 
+        if (x86_pmu.start_scheduling)
+                x86_pmu.start_scheduling(cpuc);
+
         for (i = 0, wmin = X86_PMC_IDX_MAX, wmax = 0; i < n; i++) {
                 hwc = &cpuc->event_list[i]->hw;
                 c = x86_pmu.get_event_constraints(cpuc, cpuc->event_list[i]);
@@ -830,6 +833,8 @@ int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign)
                 for (i = 0; i < n; i++) {
                         e = cpuc->event_list[i];
                         e->hw.flags |= PERF_X86_EVENT_COMMITTED;
+                        if (x86_pmu.commit_scheduling)
+                                x86_pmu.commit_scheduling(cpuc, e, assign[i]);
                 }
         }
         /*
@@ -850,6 +855,10 @@ int x86_schedule_events(struct cpu_hw_events *cpuc, int n, int *assign)
                                 x86_pmu.put_event_constraints(cpuc, e);
                 }
         }
+
+        if (x86_pmu.stop_scheduling)
+                x86_pmu.stop_scheduling(cpuc);
+
         return num ? -EINVAL : 0;
 }
 
diff --git a/arch/x86/kernel/cpu/perf_event.h b/arch/x86/kernel/cpu/perf_event.h
index 55b915511e53..ea27e63fc945 100644
--- a/arch/x86/kernel/cpu/perf_event.h
+++ b/arch/x86/kernel/cpu/perf_event.h
@@ -460,6 +460,15 @@ struct x86_pmu {
 
         void            (*put_event_constraints)(struct cpu_hw_events *cpuc,
                                                  struct perf_event *event);
+
+        void            (*commit_scheduling)(struct cpu_hw_events *cpuc,
+                                             struct perf_event *event,
+                                             int cntr);
+
+        void            (*start_scheduling)(struct cpu_hw_events *cpuc);
+
+        void            (*stop_scheduling)(struct cpu_hw_events *cpuc);
+
         struct event_constraint *event_constraints;
         struct x86_pmu_quirk *quirks;
         int             perfctr_second_write;