x86/perf/intel/cstate: Modularize driver

Add the exit function and allow the driver to be built as a module.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Link: http://lkml.kernel.org/r/20160320185623.658869675@linutronix.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/arch/x86/Kconfig.perf b/arch/x86/Kconfig.perf
index b239ad5..7d29dd7 100644 (file)
--- a/arch/x86/Kconfig.perf
+++ b/arch/x86/Kconfig.perf
@@ -16,4 +16,12 @@ config PERF_EVENTS_INTEL_RAPL
        Include support for Intel rapl performance events for power
        monitoring on modern processors.
 
+config PERF_EVENTS_INTEL_CSTATE
+       tristate "Intel cstate performance events"
+       depends on PERF_EVENTS && CPU_SUP_INTEL && PCI
+       default y
+       ---help---
+       Include support for Intel cstate performance events for power
+       monitoring on modern processors.
+
 endmenu

diff --git a/arch/x86/events/intel/Makefile b/arch/x86/events/intel/Makefile
index 27adbba..3660b2c 100644 (file)
--- a/arch/x86/events/intel/Makefile
+++ b/arch/x86/events/intel/Makefile
@@ -1,7 +1,9 @@
 obj-$(CONFIG_CPU_SUP_INTEL)            += core.o bts.o cqm.o
-obj-$(CONFIG_CPU_SUP_INTEL)            += cstate.o ds.o knc.o
+obj-$(CONFIG_CPU_SUP_INTEL)            += ds.o knc.o
 obj-$(CONFIG_CPU_SUP_INTEL)            += lbr.o p4.o p6.o pt.o
 obj-$(CONFIG_PERF_EVENTS_INTEL_RAPL)   += intel-rapl.o
 intel-rapl-objs                                := rapl.o
 obj-$(CONFIG_PERF_EVENTS_INTEL_UNCORE) += intel-uncore.o
 intel-uncore-objs                      := uncore.o uncore_nhmex.o uncore_snb.o uncore_snbep.o
+obj-$(CONFIG_PERF_EVENTS_INTEL_CSTATE) += intel-cstate.o
+intel-cstate-objs                      := cstate.o

diff --git a/arch/x86/events/intel/cstate.c b/arch/x86/events/intel/cstate.c
index e90ec9e..9ba4e41 100644 (file)
--- a/arch/x86/events/intel/cstate.c
+++ b/arch/x86/events/intel/cstate.c
@@ -91,6 +91,8 @@
 #include <asm/cpu_device_id.h>
 #include "../perf_event.h"
 
+MODULE_LICENSE("GPL");
+
 #define DEFINE_CSTATE_FORMAT_ATTR(_var, _name, _format)                \
 static ssize_t __cstate_##_var##_show(struct kobject *kobj,    \
                                struct kobj_attribute *attr,    \
@@ -432,6 +434,11 @@ static int cstate_cpu_notifier(struct notifier_block *self,
        return NOTIFY_OK;
 }
 
+static struct notifier_block cstate_cpu_nb = {
+       .notifier_call  = cstate_cpu_notifier,
+       .priority       = CPU_PRI_PERF + 1,
+};
+
 static struct pmu cstate_core_pmu = {
        .attr_groups    = core_attr_groups,
        .name           = "cstate_core",
@@ -581,7 +588,7 @@ static int __init cstate_probe(const struct cstate_model *cm)
        return (has_cstate_core || has_cstate_pkg) ? 0 : -ENODEV;
 }
 
-static void __init cstate_cleanup(void)
+static inline void cstate_cleanup(void)
 {
        if (has_cstate_core)
                perf_pmu_unregister(&cstate_core_pmu);
@@ -616,7 +623,7 @@ static int __init cstate_init(void)
                        goto out;
                }
        }
-       __perf_cpu_notifier(cstate_cpu_notifier);
+       __register_cpu_notifier(&cstate_cpu_nb);
 out:
        cpu_notifier_register_done();
        return err;
@@ -640,4 +647,13 @@ static int __init cstate_pmu_init(void)
 
        return cstate_init();
 }
-device_initcall(cstate_pmu_init);
+module_init(cstate_pmu_init);
+
+static void __exit cstate_pmu_exit(void)
+{
+       cpu_notifier_register_begin();
+       __unregister_cpu_notifier(&cstate_cpu_nb);
+       cstate_cleanup();
+       cpu_notifier_register_done();
+}
+module_exit(cstate_pmu_exit);