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[patch V3 28/28] x86/perf/intel/rapl: Make it modular

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  [patch V3 28/28] x86/perf/intel/rapl: Make it modular Thomas Gleixner <tglx@linutronix.de> - 2016-02-22 23:30 +0100

#1339995 — [patch V3 28/28] x86/perf/intel/rapl: Make it modular

Add the necessary exit functions so it can be built as a module.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/Kconfig.perf                       |   13 +++++++++++++
 arch/x86/kernel/cpu/Makefile                |    4 +++-
 arch/x86/kernel/cpu/perf_event_intel_rapl.c |   22 +++++++++++++++++++---
 3 files changed, 35 insertions(+), 4 deletions(-)

--- a/arch/x86/Kconfig.perf
+++ b/arch/x86/Kconfig.perf
@@ -13,4 +13,17 @@ config PERF_EVENTS_INTEL_UNCORE
 
 	  If unsure say y.
 
+config PERF_EVENTS_INTEL_RAPL
+	tristate "Intel rapl performance events"
+	depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
+	default y
+	---help---
+	  Include support for Intel rapl performance events for power
+	  monitoring on modern processors.
+
+	  Note: Selecting 'm' might break existing setups as the drivers
+	  lack the autoprobe/load magic. If you need them select: y.
+
+	  If unsure say y.
+
 endmenu
--- a/arch/x86/kernel/cpu/Makefile
+++ b/arch/x86/kernel/cpu/Makefile
@@ -39,10 +39,12 @@ obj-$(CONFIG_CPU_SUP_AMD)		+= perf_event
 endif
 obj-$(CONFIG_CPU_SUP_INTEL)		+= perf_event_p6.o perf_event_knc.o perf_event_p4.o
 obj-$(CONFIG_CPU_SUP_INTEL)		+= perf_event_intel_lbr.o perf_event_intel_ds.o perf_event_intel.o
-obj-$(CONFIG_CPU_SUP_INTEL)		+= perf_event_intel_rapl.o perf_event_intel_cqm.o
+obj-$(CONFIG_CPU_SUP_INTEL)		+= perf_event_intel_cqm.o
 obj-$(CONFIG_CPU_SUP_INTEL)		+= perf_event_intel_pt.o perf_event_intel_bts.o
 obj-$(CONFIG_CPU_SUP_INTEL)		+= perf_event_intel_cstate.o
 
+obj-$(CONFIG_PERF_EVENTS_INTEL_RAPL)	+= perf_event_intel_rapl.o
+
 obj-$(CONFIG_PERF_EVENTS_INTEL_UNCORE)	+= perf_event_intel_uncores.o
 perf_event_intel_uncores-objs		:= perf_event_intel_uncore.o \
 					   perf_event_intel_uncore_snb.o \
--- a/arch/x86/kernel/cpu/perf_event_intel_rapl.c
+++ b/arch/x86/kernel/cpu/perf_event_intel_rapl.c
@@ -53,6 +53,8 @@
 #include <asm/cpu_device_id.h>
 #include "perf_event.h"
 
+MODULE_LICENSE("GPL");
+
 /*
  * RAPL energy status counters
  */
@@ -592,6 +594,10 @@ static int rapl_cpu_notifier(struct noti
 	return NOTIFY_OK;
 }
 
+static struct notifier_block rapl_cpu_nb = {
+	.notifier_call	= rapl_cpu_notifier,
+};
+
 static __init void rapl_hsw_server_quirk(void)
 {
 	/*
@@ -666,7 +672,7 @@ static int __init rapl_prepare_cpus(void
 	return 0;
 }
 
-static void __init cleanup_rapl_pmus(void)
+static void cleanup_rapl_pmus(void)
 {
 	int i;
 
@@ -759,7 +765,7 @@ static int __init rapl_pmu_init(void)
 	if (ret)
 		goto out;
 
-	__perf_cpu_notifier(rapl_cpu_notifier);
+	__register_cpu_notifier(&rapl_cpu_nb);
 	cpu_notifier_register_done();
 	rapl_advertise();
 	return 0;
@@ -770,4 +776,14 @@ static int __init rapl_pmu_init(void)
 	cpu_notifier_register_done();
 	return ret;
 }
-device_initcall(rapl_pmu_init);
+module_init(rapl_pmu_init);
+
+static void __exit intel_rapl_exit(void)
+{
+	cpu_notifier_register_done();
+	__unregister_cpu_notifier(&rapl_cpu_nb);
+	perf_pmu_unregister(&rapl_pmus->pmu);
+	cleanup_rapl_pmus();
+	cpu_notifier_register_done();
+}
+module_exit(intel_rapl_exit);

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