Merge branch 'x86-headers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

[deliverable/linux.git] / arch / x86 / events / amd / ibs.c

diff --git a/arch/x86/events/amd/ibs.c b/arch/x86/events/amd/ibs.c
index 72dea2f40fc4d43bb61b486f8f784c5a02aa6fe7..b26ee32f73e8af227901b2b7f6d0a5ad620f65a3 100644 (file)
--- a/arch/x86/events/amd/ibs.c
+++ b/arch/x86/events/amd/ibs.c
@@ -7,7 +7,8 @@
  */
 
 #include <linux/perf_event.h>
-#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/export.h>
 #include <linux/pci.h>
 #include <linux/ptrace.h>
 #include <linux/syscore_ops.h>
@@ -725,13 +726,10 @@ static __init int perf_ibs_pmu_init(struct perf_ibs *perf_ibs, char *name)
        return ret;
 }
 
-static __init int perf_event_ibs_init(void)
+static __init void perf_event_ibs_init(void)
 {
        struct attribute **attr = ibs_op_format_attrs;
 
-       if (!ibs_caps)
-               return -ENODEV; /* ibs not supported by the cpu */
-
        perf_ibs_pmu_init(&perf_ibs_fetch, "ibs_fetch");
 
        if (ibs_caps & IBS_CAPS_OPCNT) {
@@ -742,13 +740,11 @@ static __init int perf_event_ibs_init(void)
 
        register_nmi_handler(NMI_LOCAL, perf_ibs_nmi_handler, 0, "perf_ibs");
        pr_info("perf: AMD IBS detected (0x%08x)\n", ibs_caps);
-
-       return 0;
 }
 
 #else /* defined(CONFIG_PERF_EVENTS) && defined(CONFIG_CPU_SUP_AMD) */
 
-static __init int perf_event_ibs_init(void) { return 0; }
+static __init void perf_event_ibs_init(void) { }
 
 #endif
 
@@ -925,7 +921,7 @@ static inline int get_ibs_lvt_offset(void)
        return val & IBSCTL_LVT_OFFSET_MASK;
 }
 
-static void setup_APIC_ibs(void *dummy)
+static void setup_APIC_ibs(void)
 {
        int offset;
 
@@ -940,7 +936,7 @@ failed:
                smp_processor_id());
 }
 
-static void clear_APIC_ibs(void *dummy)
+static void clear_APIC_ibs(void)
 {
        int offset;
 
@@ -949,18 +945,24 @@ static void clear_APIC_ibs(void *dummy)
                setup_APIC_eilvt(offset, 0, APIC_EILVT_MSG_FIX, 1);
 }
 
+static int x86_pmu_amd_ibs_starting_cpu(unsigned int cpu)
+{
+       setup_APIC_ibs();
+       return 0;
+}
+
 #ifdef CONFIG_PM
 
 static int perf_ibs_suspend(void)
 {
-       clear_APIC_ibs(NULL);
+       clear_APIC_ibs();
        return 0;
 }
 
 static void perf_ibs_resume(void)
 {
        ibs_eilvt_setup();
-       setup_APIC_ibs(NULL);
+       setup_APIC_ibs();
 }
 
 static struct syscore_ops perf_ibs_syscore_ops = {
@@ -979,27 +981,15 @@ static inline void perf_ibs_pm_init(void) { }
 
 #endif
 
-static int
-perf_ibs_cpu_notifier(struct notifier_block *self, unsigned long action, void *hcpu)
+static int x86_pmu_amd_ibs_dying_cpu(unsigned int cpu)
 {
-       switch (action & ~CPU_TASKS_FROZEN) {
-       case CPU_STARTING:
-               setup_APIC_ibs(NULL);
-               break;
-       case CPU_DYING:
-               clear_APIC_ibs(NULL);
-               break;
-       default:
-               break;
-       }
-
-       return NOTIFY_OK;
+       clear_APIC_ibs();
+       return 0;
 }
 
 static __init int amd_ibs_init(void)
 {
        u32 caps;
-       int ret = -EINVAL;
 
        caps = __get_ibs_caps();
        if (!caps)
@@ -1008,22 +998,25 @@ static __init int amd_ibs_init(void)
        ibs_eilvt_setup();
 
        if (!ibs_eilvt_valid())
-               goto out;
+               return -EINVAL;
 
        perf_ibs_pm_init();
-       cpu_notifier_register_begin();
+
        ibs_caps = caps;
        /* make ibs_caps visible to other cpus: */
        smp_mb();
-       smp_call_function(setup_APIC_ibs, NULL, 1);
-       __perf_cpu_notifier(perf_ibs_cpu_notifier);
-       cpu_notifier_register_done();
+       /*
+        * x86_pmu_amd_ibs_starting_cpu will be called from core on
+        * all online cpus.
+        */
+       cpuhp_setup_state(CPUHP_AP_PERF_X86_AMD_IBS_STARTING,
+                         "AP_PERF_X86_AMD_IBS_STARTING",
+                         x86_pmu_amd_ibs_starting_cpu,
+                         x86_pmu_amd_ibs_dying_cpu);
 
-       ret = perf_event_ibs_init();
-out:
-       if (ret)
-               pr_err("Failed to setup IBS, %d\n", ret);
-       return ret;
+       perf_event_ibs_init();
+
+       return 0;
 }
 
 /* Since we need the pci subsystem to init ibs we can't do this earlier: */