perf/x86/intel: Fix intel_get_event_constraints() for dynamic constraints

With dynamic constraint, we need to restart from the static
constraints each time the intel_get_event_constraints() is called.

Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Maria Dimakopoulou <maria.n.dimakopoulou@gmail.com>
Cc: bp@alien8.de
Cc: jolsa@redhat.com
Cc: kan.liang@intel.com
Link: http://lkml.kernel.org/r/1416251225-17721-10-git-send-email-eranian@google.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/kernel/cpu/perf_event_intel.c b/arch/x86/kernel/cpu/perf_event_intel.c
index 9350de0..4773ae0 100644 (file)
--- a/arch/x86/kernel/cpu/perf_event_intel.c
+++ b/arch/x86/kernel/cpu/perf_event_intel.c
@@ -2063,20 +2063,25 @@ static struct event_constraint *
 intel_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
                            struct perf_event *event)
 {
-       struct event_constraint *c = event->hw.constraint;
+       struct event_constraint *c1 = event->hw.constraint;
+       struct event_constraint *c2;
 
        /*
         * first time only
         * - static constraint: no change across incremental scheduling calls
         * - dynamic constraint: handled by intel_get_excl_constraints()
         */
-       if (!c)
-               c = __intel_get_event_constraints(cpuc, idx, event);
+       c2 = __intel_get_event_constraints(cpuc, idx, event);
+       if (c1 && (c1->flags & PERF_X86_EVENT_DYNAMIC)) {
+               bitmap_copy(c1->idxmsk, c2->idxmsk, X86_PMC_IDX_MAX);
+               c1->weight = c2->weight;
+               c2 = c1;
+       }
 
        if (cpuc->excl_cntrs)
-               return intel_get_excl_constraints(cpuc, event, idx, c);
+               return intel_get_excl_constraints(cpuc, event, idx, c2);
 
-       return c;
+       return c2;
 }
 
 static void intel_put_excl_constraints(struct cpu_hw_events *cpuc,