perf: Rework and fix the arch CPU-hotplug hooks
[linux-2.6.git] / arch / x86 / kernel / cpu / perf_event.c
index 42aafd1..585d560 100644 (file)
@@ -157,6 +157,11 @@ struct x86_pmu {
        void            (*put_event_constraints)(struct cpu_hw_events *cpuc,
                                                 struct perf_event *event);
        struct event_constraint *event_constraints;
+
+       void            (*cpu_prepare)(int cpu);
+       void            (*cpu_starting)(int cpu);
+       void            (*cpu_dying)(int cpu);
+       void            (*cpu_dead)(int cpu);
 };
 
 static struct x86_pmu x86_pmu __read_mostly;
@@ -293,7 +298,7 @@ static inline bool bts_available(void)
        return x86_pmu.enable_bts != NULL;
 }
 
-static inline void init_debug_store_on_cpu(int cpu)
+static void init_debug_store_on_cpu(int cpu)
 {
        struct debug_store *ds = per_cpu(cpu_hw_events, cpu).ds;
 
@@ -305,7 +310,7 @@ static inline void init_debug_store_on_cpu(int cpu)
                     (u32)((u64)(unsigned long)ds >> 32));
 }
 
-static inline void fini_debug_store_on_cpu(int cpu)
+static void fini_debug_store_on_cpu(int cpu)
 {
        if (!per_cpu(cpu_hw_events, cpu).ds)
                return;
@@ -1337,6 +1342,39 @@ undo:
 #include "perf_event_p6.c"
 #include "perf_event_intel.c"
 
+static int __cpuinit
+x86_pmu_notifier(struct notifier_block *self, unsigned long action, void *hcpu)
+{
+       unsigned int cpu = (long)hcpu;
+
+       switch (action & ~CPU_TASKS_FROZEN) {
+       case CPU_UP_PREPARE:
+               if (x86_pmu.cpu_prepare)
+                       x86_pmu.cpu_prepare(cpu);
+               break;
+
+       case CPU_STARTING:
+               if (x86_pmu.cpu_starting)
+                       x86_pmu.cpu_starting(cpu);
+               break;
+
+       case CPU_DYING:
+               if (x86_pmu.cpu_dying)
+                       x86_pmu.cpu_dying(cpu);
+               break;
+
+       case CPU_DEAD:
+               if (x86_pmu.cpu_dead)
+                       x86_pmu.cpu_dead(cpu);
+               break;
+
+       default:
+               break;
+       }
+
+       return NOTIFY_OK;
+}
+
 static void __init pmu_check_apic(void)
 {
        if (cpu_has_apic)
@@ -1415,6 +1453,8 @@ void __init init_hw_perf_events(void)
        pr_info("... max period:             %016Lx\n", x86_pmu.max_period);
        pr_info("... fixed-purpose events:   %d\n",     x86_pmu.num_events_fixed);
        pr_info("... event mask:             %016Lx\n", perf_event_mask);
+
+       perf_cpu_notifier(x86_pmu_notifier);
 }
 
 static inline void x86_pmu_read(struct perf_event *event)
@@ -1674,29 +1714,3 @@ struct perf_callchain_entry *perf_callchain(struct pt_regs *regs)
 
        return entry;
 }
-
-void hw_perf_event_setup_online(int cpu)
-{
-       init_debug_store_on_cpu(cpu);
-
-       switch (boot_cpu_data.x86_vendor) {
-       case X86_VENDOR_AMD:
-               amd_pmu_cpu_online(cpu);
-               break;
-       default:
-               return;
-       }
-}
-
-void hw_perf_event_setup_offline(int cpu)
-{
-       init_debug_store_on_cpu(cpu);
-
-       switch (boot_cpu_data.x86_vendor) {
-       case X86_VENDOR_AMD:
-               amd_pmu_cpu_offline(cpu);
-               break;
-       default:
-               return;
-       }
-}