Merge tag 'arm-perf-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux into next/cleanup

From Will Deacon:

Bunch of perf updates for the ARM backend that pave the way for
big.LITTLE support in the future. The separation of CPU and PMU code
is also the start of being able to move some of this stuff under
drivers/.

* tag 'arm-perf-3.7' of git://git.kernel.org/pub/scm/linux/kernel/git/will/linux:
  ARM: perf: move irq registration into pmu implementation
  ARM: perf: move CPU-specific PMU handling code into separate file
  ARM: perf: prepare for moving CPU PMU code into separate file
  ARM: perf: probe devicetree in preference to current CPU
  ARM: perf: remove mysterious compiler barrier
  ARM: pmu: remove arm_pmu_type enumeration
  ARM: pmu: remove unused reservation mechanism
  ARM: perf: add devicetree bindings for 11MPcore, A5, A7 and A15 PMUs
  ARM: PMU: Add runtime PM Support

7 files changed, 374 insertions, 361 deletions

diff --git a/arch/arm/kernel/Makefile b/arch/arm/kernel/Makefile
index 7ad2d5cf7008..1c4321430737 100644
--- a/arch/arm/kernel/Makefile
+++ b/arch/arm/kernel/Makefile
@@ -69,8 +69,7 @@ obj-$(CONFIG_CPU_XSC3)		+= xscale-cp0.o
 obj-$(CONFIG_CPU_MOHAWK)	+= xscale-cp0.o
 obj-$(CONFIG_CPU_PJ4)		+= pj4-cp0.o
 obj-$(CONFIG_IWMMXT)		+= iwmmxt.o
-obj-$(CONFIG_CPU_HAS_PMU)	+= pmu.o
-obj-$(CONFIG_HW_PERF_EVENTS)	+= perf_event.o
+obj-$(CONFIG_HW_PERF_EVENTS)	+= perf_event.o perf_event_cpu.o
 AFLAGS_iwmmxt.o			:= -Wa,-mcpu=iwmmxt
 obj-$(CONFIG_ARM_CPU_TOPOLOGY)  += topology.o
 
diff --git a/arch/arm/kernel/perf_event.c b/arch/arm/kernel/perf_event.c
index ab243b87118d..93971b1a4f0b 100644
--- a/arch/arm/kernel/perf_event.c
+++ b/arch/arm/kernel/perf_event.c
@@ -12,68 +12,15 @@
  */
 #define pr_fmt(fmt) "hw perfevents: " fmt
 
-#include <linux/bitmap.h>
-#include <linux/interrupt.h>
 #include <linux/kernel.h>
-#include <linux/export.h>
-#include <linux/perf_event.h>
 #include <linux/platform_device.h>
-#include <linux/spinlock.h>
+#include <linux/pm_runtime.h>
 #include <linux/uaccess.h>
 
-#include <asm/cputype.h>
-#include <asm/irq.h>
 #include <asm/irq_regs.h>
 #include <asm/pmu.h>
 #include <asm/stacktrace.h>
 
-/*
- * ARMv6 supports a maximum of 3 events, starting from index 0. If we add
- * another platform that supports more, we need to increase this to be the
- * largest of all platforms.
- *
- * ARMv7 supports up to 32 events:
- *  cycle counter CCNT + 31 events counters CNT0..30.
- *  Cortex-A8 has 1+4 counters, Cortex-A9 has 1+6 counters.
- */
-#define ARMPMU_MAX_HWEVENTS		32
-
-static DEFINE_PER_CPU(struct perf_event * [ARMPMU_MAX_HWEVENTS], hw_events);
-static DEFINE_PER_CPU(unsigned long [BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)], used_mask);
-static DEFINE_PER_CPU(struct pmu_hw_events, cpu_hw_events);
-
-#define to_arm_pmu(p) (container_of(p, struct arm_pmu, pmu))
-
-/* Set at runtime when we know what CPU type we are. */
-static struct arm_pmu *cpu_pmu;
-
-const char *perf_pmu_name(void)
-{
-	if (!cpu_pmu)
-		return NULL;
-
-	return cpu_pmu->pmu.name;
-}
-EXPORT_SYMBOL_GPL(perf_pmu_name);
-
-int perf_num_counters(void)
-{
-	int max_events = 0;
-
-	if (cpu_pmu != NULL)
-		max_events = cpu_pmu->num_events;
-
-	return max_events;
-}
-EXPORT_SYMBOL_GPL(perf_num_counters);
-
-#define HW_OP_UNSUPPORTED		0xFFFF
-
-#define C(_x) \
-	PERF_COUNT_HW_CACHE_##_x
-
-#define CACHE_OP_UNSUPPORTED		0xFFFF
-
 static int
 armpmu_map_cache_event(const unsigned (*cache_map)
 				      [PERF_COUNT_HW_CACHE_MAX]
@@ -104,7 +51,7 @@ armpmu_map_cache_event(const unsigned (*cache_map)
 }
 
 static int
-armpmu_map_event(const unsigned (*event_map)[PERF_COUNT_HW_MAX], u64 config)
+armpmu_map_hw_event(const unsigned (*event_map)[PERF_COUNT_HW_MAX], u64 config)
 {
 	int mapping = (*event_map)[config];
 	return mapping == HW_OP_UNSUPPORTED ? -ENOENT : mapping;
@@ -116,19 +63,20 @@ armpmu_map_raw_event(u32 raw_event_mask, u64 config)
 	return (int)(config & raw_event_mask);
 }
 
-static int map_cpu_event(struct perf_event *event,
-			 const unsigned (*event_map)[PERF_COUNT_HW_MAX],
-			 const unsigned (*cache_map)
-					[PERF_COUNT_HW_CACHE_MAX]
-					[PERF_COUNT_HW_CACHE_OP_MAX]
-					[PERF_COUNT_HW_CACHE_RESULT_MAX],
-			 u32 raw_event_mask)
+int
+armpmu_map_event(struct perf_event *event,
+		 const unsigned (*event_map)[PERF_COUNT_HW_MAX],
+		 const unsigned (*cache_map)
+				[PERF_COUNT_HW_CACHE_MAX]
+				[PERF_COUNT_HW_CACHE_OP_MAX]
+				[PERF_COUNT_HW_CACHE_RESULT_MAX],
+		 u32 raw_event_mask)
 {
 	u64 config = event->attr.config;
 
 	switch (event->attr.type) {
 	case PERF_TYPE_HARDWARE:
-		return armpmu_map_event(event_map, config);
+		return armpmu_map_hw_event(event_map, config);
 	case PERF_TYPE_HW_CACHE:
 		return armpmu_map_cache_event(cache_map, config);
 	case PERF_TYPE_RAW:
@@ -222,7 +170,6 @@ armpmu_stop(struct perf_event *event, int flags)
 	 */
 	if (!(hwc->state & PERF_HES_STOPPED)) {
 		armpmu->disable(hwc, hwc->idx);
-		barrier(); /* why? */
 		armpmu_event_update(event, hwc, hwc->idx);
 		hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE;
 	}
@@ -350,99 +297,41 @@ validate_group(struct perf_event *event)
 	return 0;
 }
 
-static irqreturn_t armpmu_platform_irq(int irq, void *dev)
+static irqreturn_t armpmu_dispatch_irq(int irq, void *dev)
 {
 	struct arm_pmu *armpmu = (struct arm_pmu *) dev;
 	struct platform_device *plat_device = armpmu->plat_device;
 	struct arm_pmu_platdata *plat = dev_get_platdata(&plat_device->dev);
 
-	return plat->handle_irq(irq, dev, armpmu->handle_irq);
+	if (plat && plat->handle_irq)
+		return plat->handle_irq(irq, dev, armpmu->handle_irq);
+	else
+		return armpmu->handle_irq(irq, dev);
 }
 
 static void
 armpmu_release_hardware(struct arm_pmu *armpmu)
 {
-	int i, irq, irqs;
-	struct platform_device *pmu_device = armpmu->plat_device;
-	struct arm_pmu_platdata *plat =
-		dev_get_platdata(&pmu_device->dev);
-
-	irqs = min(pmu_device->num_resources, num_possible_cpus());
-
-	for (i = 0; i < irqs; ++i) {
-		if (!cpumask_test_and_clear_cpu(i, &armpmu->active_irqs))
-			continue;
-		irq = platform_get_irq(pmu_device, i);
-		if (irq >= 0) {
-			if (plat && plat->disable_irq)
-				plat->disable_irq(irq);
-			free_irq(irq, armpmu);
-		}
-	}
-
-	release_pmu(armpmu->type);
+	armpmu->free_irq();
+	pm_runtime_put_sync(&armpmu->plat_device->dev);
 }
 
 static int
 armpmu_reserve_hardware(struct arm_pmu *armpmu)
 {
-	struct arm_pmu_platdata *plat;
-	irq_handler_t handle_irq;
-	int i, err, irq, irqs;
+	int err;
 	struct platform_device *pmu_device = armpmu->plat_device;
 
 	if (!pmu_device)
 		return -ENODEV;
 
-	err = reserve_pmu(armpmu->type);
+	pm_runtime_get_sync(&pmu_device->dev);
+	err = armpmu->request_irq(armpmu_dispatch_irq);
 	if (err) {
-		pr_warning("unable to reserve pmu\n");
+		armpmu_release_hardware(armpmu);
 		return err;
 	}
 
-	plat = dev_get_platdata(&pmu_device->dev);
-	if (plat && plat->handle_irq)
-		handle_irq = armpmu_platform_irq;
-	else
-		handle_irq = armpmu->handle_irq;
-
-	irqs = min(pmu_device->num_resources, num_possible_cpus());
-	if (irqs < 1) {
-		pr_err("no irqs for PMUs defined\n");
-		return -ENODEV;
-	}
-
-	for (i = 0; i < irqs; ++i) {
-		err = 0;
-		irq = platform_get_irq(pmu_device, i);
-		if (irq < 0)
-			continue;
-
-		/*
-		 * If we have a single PMU interrupt that we can't shift,
-		 * assume that we're running on a uniprocessor machine and
-		 * continue. Otherwise, continue without this interrupt.
-		 */
-		if (irq_set_affinity(irq, cpumask_of(i)) && irqs > 1) {
-			pr_warning("unable to set irq affinity (irq=%d, cpu=%u)\n",
-				    irq, i);
-			continue;
-		}
-
-		err = request_irq(irq, handle_irq,
-				  IRQF_DISABLED | IRQF_NOBALANCING,
-				  "arm-pmu", armpmu);
-		if (err) {
-			pr_err("unable to request IRQ%d for ARM PMU counters\n",
-				irq);
-			armpmu_release_hardware(armpmu);
-			return err;
-		} else if (plat && plat->enable_irq)
-			plat->enable_irq(irq);
-
-		cpumask_set_cpu(i, &armpmu->active_irqs);
-	}
-
 	return 0;
 }
 
@@ -581,6 +470,32 @@ static void armpmu_disable(struct pmu *pmu)
 	armpmu->stop();
 }
 
+#ifdef CONFIG_PM_RUNTIME
+static int armpmu_runtime_resume(struct device *dev)
+{
+	struct arm_pmu_platdata *plat = dev_get_platdata(dev);
+
+	if (plat && plat->runtime_resume)
+		return plat->runtime_resume(dev);
+
+	return 0;
+}
+
+static int armpmu_runtime_suspend(struct device *dev)
+{
+	struct arm_pmu_platdata *plat = dev_get_platdata(dev);
+
+	if (plat && plat->runtime_suspend)
+		return plat->runtime_suspend(dev);
+
+	return 0;
+}
+#endif
+
+const struct dev_pm_ops armpmu_dev_pm_ops = {
+	SET_RUNTIME_PM_OPS(armpmu_runtime_suspend, armpmu_runtime_resume, NULL)
+};
+
 static void __init armpmu_init(struct arm_pmu *armpmu)
 {
 	atomic_set(&armpmu->active_events, 0);
@@ -598,174 +513,14 @@ static void __init armpmu_init(struct arm_pmu *armpmu)
 	};
 }
 
-int __init armpmu_register(struct arm_pmu *armpmu, char *name, int type)
+int armpmu_register(struct arm_pmu *armpmu, char *name, int type)
 {
 	armpmu_init(armpmu);
+	pr_info("enabled with %s PMU driver, %d counters available\n",
+			armpmu->name, armpmu->num_events);
 	return perf_pmu_register(&armpmu->pmu, name, type);
 }
 
-/* Include the PMU-specific implementations. */
-#include "perf_event_xscale.c"
-#include "perf_event_v6.c"
-#include "perf_event_v7.c"
-
-/*
- * Ensure the PMU has sane values out of reset.
- * This requires SMP to be available, so exists as a separate initcall.
- */
-static int __init
-cpu_pmu_reset(void)
-{
-	if (cpu_pmu && cpu_pmu->reset)
-		return on_each_cpu(cpu_pmu->reset, NULL, 1);
-	return 0;
-}
-arch_initcall(cpu_pmu_reset);
-
-/*
- * PMU platform driver and devicetree bindings.
- */
-static struct of_device_id armpmu_of_device_ids[] = {
-	{.compatible = "arm,cortex-a9-pmu"},
-	{.compatible = "arm,cortex-a8-pmu"},
-	{.compatible = "arm,arm1136-pmu"},
-	{.compatible = "arm,arm1176-pmu"},
-	{},
-};
-
-static struct platform_device_id armpmu_plat_device_ids[] = {
-	{.name = "arm-pmu"},
-	{},
-};
-
-static int __devinit armpmu_device_probe(struct platform_device *pdev)
-{
-	if (!cpu_pmu)
-		return -ENODEV;
-
-	cpu_pmu->plat_device = pdev;
-	return 0;
-}
-
-static struct platform_driver armpmu_driver = {
-	.driver		= {
-		.name	= "arm-pmu",
-		.of_match_table = armpmu_of_device_ids,
-	},
-	.probe		= armpmu_device_probe,
-	.id_table	= armpmu_plat_device_ids,
-};
-
-static int __init register_pmu_driver(void)
-{
-	return platform_driver_register(&armpmu_driver);
-}
-device_initcall(register_pmu_driver);
-
-static struct pmu_hw_events *armpmu_get_cpu_events(void)
-{
-	return &__get_cpu_var(cpu_hw_events);
-}
-
-static void __init cpu_pmu_init(struct arm_pmu *armpmu)
-{
-	int cpu;
-	for_each_possible_cpu(cpu) {
-		struct pmu_hw_events *events = &per_cpu(cpu_hw_events, cpu);
-		events->events = per_cpu(hw_events, cpu);
-		events->used_mask = per_cpu(used_mask, cpu);
-		raw_spin_lock_init(&events->pmu_lock);
-	}
-	armpmu->get_hw_events = armpmu_get_cpu_events;
-	armpmu->type = ARM_PMU_DEVICE_CPU;
-}
-
-/*
- * PMU hardware loses all context when a CPU goes offline.
- * When a CPU is hotplugged back in, since some hardware registers are
- * UNKNOWN at reset, the PMU must be explicitly reset to avoid reading
- * junk values out of them.
- */
-static int __cpuinit pmu_cpu_notify(struct notifier_block *b,
-					unsigned long action, void *hcpu)
-{
-	if ((action & ~CPU_TASKS_FROZEN) != CPU_STARTING)
-		return NOTIFY_DONE;
-
-	if (cpu_pmu && cpu_pmu->reset)
-		cpu_pmu->reset(NULL);
-
-	return NOTIFY_OK;
-}
-
-static struct notifier_block __cpuinitdata pmu_cpu_notifier = {
-	.notifier_call = pmu_cpu_notify,
-};
-
-/*
- * CPU PMU identification and registration.
- */
-static int __init
-init_hw_perf_events(void)
-{
-	unsigned long cpuid = read_cpuid_id();
-	unsigned long implementor = (cpuid & 0xFF000000) >> 24;
-	unsigned long part_number = (cpuid & 0xFFF0);
-
-	/* ARM Ltd CPUs. */
-	if (0x41 == implementor) {
-		switch (part_number) {
-		case 0xB360:	/* ARM1136 */
-		case 0xB560:	/* ARM1156 */
-		case 0xB760:	/* ARM1176 */
-			cpu_pmu = armv6pmu_init();
-			break;
-		case 0xB020:	/* ARM11mpcore */
-			cpu_pmu = armv6mpcore_pmu_init();
-			break;
-		case 0xC080:	/* Cortex-A8 */
-			cpu_pmu = armv7_a8_pmu_init();
-			break;
-		case 0xC090:	/* Cortex-A9 */
-			cpu_pmu = armv7_a9_pmu_init();
-			break;
-		case 0xC050:	/* Cortex-A5 */
-			cpu_pmu = armv7_a5_pmu_init();
-			break;
-		case 0xC0F0:	/* Cortex-A15 */
-			cpu_pmu = armv7_a15_pmu_init();
-			break;
-		case 0xC070:	/* Cortex-A7 */
-			cpu_pmu = armv7_a7_pmu_init();
-			break;
-		}
-	/* Intel CPUs [xscale]. */
-	} else if (0x69 == implementor) {
-		part_number = (cpuid >> 13) & 0x7;
-		switch (part_number) {
-		case 1:
-			cpu_pmu = xscale1pmu_init();
-			break;
-		case 2:
-			cpu_pmu = xscale2pmu_init();
-			break;
-		}
-	}
-
-	if (cpu_pmu) {
-		pr_info("enabled with %s PMU driver, %d counters available\n",
-			cpu_pmu->name, cpu_pmu->num_events);
-		cpu_pmu_init(cpu_pmu);
-		register_cpu_notifier(&pmu_cpu_notifier);
-		armpmu_register(cpu_pmu, cpu_pmu->name, PERF_TYPE_RAW);
-	} else {
-		pr_info("no hardware support available\n");
-	}
-
-	return 0;
-}
-early_initcall(init_hw_perf_events);
-
 /*
  * Callchain handling code.
  */
diff --git a/arch/arm/kernel/perf_event_cpu.c b/arch/arm/kernel/perf_event_cpu.c
new file mode 100644
index 000000000000..8d7d8d4de9d6
--- /dev/null
+++ b/arch/arm/kernel/perf_event_cpu.c
@@ -0,0 +1,295 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ *
+ * Copyright (C) 2012 ARM Limited
+ *
+ * Author: Will Deacon <will.deacon@arm.com>
+ */
+#define pr_fmt(fmt) "CPU PMU: " fmt
+
+#include <linux/bitmap.h>
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/spinlock.h>
+
+#include <asm/cputype.h>
+#include <asm/irq_regs.h>
+#include <asm/pmu.h>
+
+/* Set at runtime when we know what CPU type we are. */
+static struct arm_pmu *cpu_pmu;
+
+static DEFINE_PER_CPU(struct perf_event * [ARMPMU_MAX_HWEVENTS], hw_events);
+static DEFINE_PER_CPU(unsigned long [BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)], used_mask);
+static DEFINE_PER_CPU(struct pmu_hw_events, cpu_hw_events);
+
+/*
+ * Despite the names, these two functions are CPU-specific and are used
+ * by the OProfile/perf code.
+ */
+const char *perf_pmu_name(void)
+{
+	if (!cpu_pmu)
+		return NULL;
+
+	return cpu_pmu->pmu.name;
+}
+EXPORT_SYMBOL_GPL(perf_pmu_name);
+
+int perf_num_counters(void)
+{
+	int max_events = 0;
+
+	if (cpu_pmu != NULL)
+		max_events = cpu_pmu->num_events;
+
+	return max_events;
+}
+EXPORT_SYMBOL_GPL(perf_num_counters);
+
+/* Include the PMU-specific implementations. */
+#include "perf_event_xscale.c"
+#include "perf_event_v6.c"
+#include "perf_event_v7.c"
+
+static struct pmu_hw_events *cpu_pmu_get_cpu_events(void)
+{
+	return &__get_cpu_var(cpu_hw_events);
+}
+
+static void cpu_pmu_free_irq(void)
+{
+	int i, irq, irqs;
+	struct platform_device *pmu_device = cpu_pmu->plat_device;
+
+	irqs = min(pmu_device->num_resources, num_possible_cpus());
+
+	for (i = 0; i < irqs; ++i) {
+		if (!cpumask_test_and_clear_cpu(i, &cpu_pmu->active_irqs))
+			continue;
+		irq = platform_get_irq(pmu_device, i);
+		if (irq >= 0)
+			free_irq(irq, cpu_pmu);
+	}
+}
+
+static int cpu_pmu_request_irq(irq_handler_t handler)
+{
+	int i, err, irq, irqs;
+	struct platform_device *pmu_device = cpu_pmu->plat_device;
+
+	if (!pmu_device)
+		return -ENODEV;
+
+	irqs = min(pmu_device->num_resources, num_possible_cpus());
+	if (irqs < 1) {
+		pr_err("no irqs for PMUs defined\n");
+		return -ENODEV;
+	}
+
+	for (i = 0; i < irqs; ++i) {
+		err = 0;
+		irq = platform_get_irq(pmu_device, i);
+		if (irq < 0)
+			continue;
+
+		/*
+		 * If we have a single PMU interrupt that we can't shift,
+		 * assume that we're running on a uniprocessor machine and
+		 * continue. Otherwise, continue without this interrupt.
+		 */
+		if (irq_set_affinity(irq, cpumask_of(i)) && irqs > 1) {
+			pr_warning("unable to set irq affinity (irq=%d, cpu=%u)\n",
+				    irq, i);
+			continue;
+		}
+
+		err = request_irq(irq, handler, IRQF_NOBALANCING, "arm-pmu",
+				  cpu_pmu);
+		if (err) {
+			pr_err("unable to request IRQ%d for ARM PMU counters\n",
+				irq);
+			return err;
+		}
+
+		cpumask_set_cpu(i, &cpu_pmu->active_irqs);
+	}
+
+	return 0;
+}
+
+static void __devinit cpu_pmu_init(struct arm_pmu *cpu_pmu)
+{
+	int cpu;
+	for_each_possible_cpu(cpu) {
+		struct pmu_hw_events *events = &per_cpu(cpu_hw_events, cpu);
+		events->events = per_cpu(hw_events, cpu);
+		events->used_mask = per_cpu(used_mask, cpu);
+		raw_spin_lock_init(&events->pmu_lock);
+	}
+
+	cpu_pmu->get_hw_events	= cpu_pmu_get_cpu_events;
+	cpu_pmu->request_irq	= cpu_pmu_request_irq;
+	cpu_pmu->free_irq	= cpu_pmu_free_irq;
+
+	/* Ensure the PMU has sane values out of reset. */
+	if (cpu_pmu && cpu_pmu->reset)
+		on_each_cpu(cpu_pmu->reset, NULL, 1);
+}
+
+/*
+ * PMU hardware loses all context when a CPU goes offline.
+ * When a CPU is hotplugged back in, since some hardware registers are
+ * UNKNOWN at reset, the PMU must be explicitly reset to avoid reading
+ * junk values out of them.
+ */
+static int __cpuinit cpu_pmu_notify(struct notifier_block *b,
+				    unsigned long action, void *hcpu)
+{
+	if ((action & ~CPU_TASKS_FROZEN) != CPU_STARTING)
+		return NOTIFY_DONE;
+
+	if (cpu_pmu && cpu_pmu->reset)
+		cpu_pmu->reset(NULL);
+
+	return NOTIFY_OK;
+}
+
+static struct notifier_block __cpuinitdata cpu_pmu_hotplug_notifier = {
+	.notifier_call = cpu_pmu_notify,
+};
+
+/*
+ * PMU platform driver and devicetree bindings.
+ */
+static struct of_device_id __devinitdata cpu_pmu_of_device_ids[] = {
+	{.compatible = "arm,cortex-a15-pmu",	.data = armv7_a15_pmu_init},
+	{.compatible = "arm,cortex-a9-pmu",	.data = armv7_a9_pmu_init},
+	{.compatible = "arm,cortex-a8-pmu",	.data = armv7_a8_pmu_init},
+	{.compatible = "arm,cortex-a7-pmu",	.data = armv7_a7_pmu_init},
+	{.compatible = "arm,cortex-a5-pmu",	.data = armv7_a5_pmu_init},
+	{.compatible = "arm,arm11mpcore-pmu",	.data = armv6mpcore_pmu_init},
+	{.compatible = "arm,arm1176-pmu",	.data = armv6pmu_init},
+	{.compatible = "arm,arm1136-pmu",	.data = armv6pmu_init},
+	{},
+};
+
+static struct platform_device_id __devinitdata cpu_pmu_plat_device_ids[] = {
+	{.name = "arm-pmu"},
+	{},
+};
+
+/*
+ * CPU PMU identification and probing.
+ */
+static struct arm_pmu *__devinit probe_current_pmu(void)
+{
+	struct arm_pmu *pmu = NULL;
+	int cpu = get_cpu();
+	unsigned long cpuid = read_cpuid_id();
+	unsigned long implementor = (cpuid & 0xFF000000) >> 24;
+	unsigned long part_number = (cpuid & 0xFFF0);
+
+	pr_info("probing PMU on CPU %d\n", cpu);
+
+	/* ARM Ltd CPUs. */
+	if (0x41 == implementor) {
+		switch (part_number) {
+		case 0xB360:	/* ARM1136 */
+		case 0xB560:	/* ARM1156 */
+		case 0xB760:	/* ARM1176 */
+			pmu = armv6pmu_init();
+			break;
+		case 0xB020:	/* ARM11mpcore */
+			pmu = armv6mpcore_pmu_init();
+			break;
+		case 0xC080:	/* Cortex-A8 */
+			pmu = armv7_a8_pmu_init();
+			break;
+		case 0xC090:	/* Cortex-A9 */
+			pmu = armv7_a9_pmu_init();
+			break;
+		case 0xC050:	/* Cortex-A5 */
+			pmu = armv7_a5_pmu_init();
+			break;
+		case 0xC0F0:	/* Cortex-A15 */
+			pmu = armv7_a15_pmu_init();
+			break;
+		case 0xC070:	/* Cortex-A7 */
+			pmu = armv7_a7_pmu_init();
+			break;
+		}
+	/* Intel CPUs [xscale]. */
+	} else if (0x69 == implementor) {
+		part_number = (cpuid >> 13) & 0x7;
+		switch (part_number) {
+		case 1:
+			pmu = xscale1pmu_init();
+			break;
+		case 2:
+			pmu = xscale2pmu_init();
+			break;
+		}
+	}
+
+	put_cpu();
+	return pmu;
+}
+
+static int __devinit cpu_pmu_device_probe(struct platform_device *pdev)
+{
+	const struct of_device_id *of_id;
+	struct arm_pmu *(*init_fn)(void);
+	struct device_node *node = pdev->dev.of_node;
+
+	if (cpu_pmu) {
+		pr_info("attempt to register multiple PMU devices!");
+		return -ENOSPC;
+	}
+
+	if (node && (of_id = of_match_node(cpu_pmu_of_device_ids, pdev->dev.of_node))) {
+		init_fn = of_id->data;
+		cpu_pmu = init_fn();
+	} else {
+		cpu_pmu = probe_current_pmu();
+	}
+
+	if (!cpu_pmu)
+		return -ENODEV;
+
+	cpu_pmu->plat_device = pdev;
+	cpu_pmu_init(cpu_pmu);
+	register_cpu_notifier(&cpu_pmu_hotplug_notifier);
+	armpmu_register(cpu_pmu, cpu_pmu->name, PERF_TYPE_RAW);
+
+	return 0;
+}
+
+static struct platform_driver cpu_pmu_driver = {
+	.driver		= {
+		.name	= "arm-pmu",
+		.pm	= &armpmu_dev_pm_ops,
+		.of_match_table = cpu_pmu_of_device_ids,
+	},
+	.probe		= cpu_pmu_device_probe,
+	.id_table	= cpu_pmu_plat_device_ids,
+};
+
+static int __init register_pmu_driver(void)
+{
+	return platform_driver_register(&cpu_pmu_driver);
+}
+device_initcall(register_pmu_driver);
diff --git a/arch/arm/kernel/perf_event_v6.c b/arch/arm/kernel/perf_event_v6.c
index c90fcb2b6967..6ccc07971745 100644
--- a/arch/arm/kernel/perf_event_v6.c
+++ b/arch/arm/kernel/perf_event_v6.c
@@ -645,7 +645,7 @@ armv6mpcore_pmu_disable_event(struct hw_perf_event *hwc,
 
 static int armv6_map_event(struct perf_event *event)
 {
-	return map_cpu_event(event, &armv6_perf_map,
+	return armpmu_map_event(event, &armv6_perf_map,
 				&armv6_perf_cache_map, 0xFF);
 }
 
@@ -664,7 +664,7 @@ static struct arm_pmu armv6pmu = {
 	.max_period		= (1LLU << 32) - 1,
 };
 
-static struct arm_pmu *__init armv6pmu_init(void)
+static struct arm_pmu *__devinit armv6pmu_init(void)
 {
 	return &armv6pmu;
 }
@@ -679,7 +679,7 @@ static struct arm_pmu *__init armv6pmu_init(void)
 
 static int armv6mpcore_map_event(struct perf_event *event)
 {
-	return map_cpu_event(event, &armv6mpcore_perf_map,
+	return armpmu_map_event(event, &armv6mpcore_perf_map,
 				&armv6mpcore_perf_cache_map, 0xFF);
 }
 
@@ -698,17 +698,17 @@ static struct arm_pmu armv6mpcore_pmu = {
 	.max_period		= (1LLU << 32) - 1,
 };
 
-static struct arm_pmu *__init armv6mpcore_pmu_init(void)
+static struct arm_pmu *__devinit armv6mpcore_pmu_init(void)
 {
 	return &armv6mpcore_pmu;
 }
 #else
-static struct arm_pmu *__init armv6pmu_init(void)
+static struct arm_pmu *__devinit armv6pmu_init(void)
 {
 	return NULL;
 }
 
-static struct arm_pmu *__init armv6mpcore_pmu_init(void)
+static struct arm_pmu *__devinit armv6mpcore_pmu_init(void)
 {
 	return NULL;
 }
diff --git a/arch/arm/kernel/perf_event_v7.c b/arch/arm/kernel/perf_event_v7.c
index f04070bd2183..bd4b090ebcfd 100644
--- a/arch/arm/kernel/perf_event_v7.c
+++ b/arch/arm/kernel/perf_event_v7.c
@@ -1204,31 +1204,31 @@ static void armv7pmu_reset(void *info)
 
 static int armv7_a8_map_event(struct perf_event *event)
 {
-	return map_cpu_event(event, &armv7_a8_perf_map,
+	return armpmu_map_event(event, &armv7_a8_perf_map,
 				&armv7_a8_perf_cache_map, 0xFF);
 }
 
 static int armv7_a9_map_event(struct perf_event *event)
 {
-	return map_cpu_event(event, &armv7_a9_perf_map,
+	return armpmu_map_event(event, &armv7_a9_perf_map,
 				&armv7_a9_perf_cache_map, 0xFF);
 }
 
 static int armv7_a5_map_event(struct perf_event *event)
 {
-	return map_cpu_event(event, &armv7_a5_perf_map,
+	return armpmu_map_event(event, &armv7_a5_perf_map,
 				&armv7_a5_perf_cache_map, 0xFF);
 }
 
 static int armv7_a15_map_event(struct perf_event *event)
 {
-	return map_cpu_event(event, &armv7_a15_perf_map,
+	return armpmu_map_event(event, &armv7_a15_perf_map,
 				&armv7_a15_perf_cache_map, 0xFF);
 }
 
 static int armv7_a7_map_event(struct perf_event *event)
 {
-	return map_cpu_event(event, &armv7_a7_perf_map,
+	return armpmu_map_event(event, &armv7_a7_perf_map,
 				&armv7_a7_perf_cache_map, 0xFF);
 }
 
@@ -1245,7 +1245,7 @@ static struct arm_pmu armv7pmu = {
 	.max_period		= (1LLU << 32) - 1,
 };
 
-static u32 __init armv7_read_num_pmnc_events(void)
+static u32 __devinit armv7_read_num_pmnc_events(void)
 {
 	u32 nb_cnt;
 
@@ -1256,7 +1256,7 @@ static u32 __init armv7_read_num_pmnc_events(void)
 	return nb_cnt + 1;
 }
 
-static struct arm_pmu *__init armv7_a8_pmu_init(void)
+static struct arm_pmu *__devinit armv7_a8_pmu_init(void)
 {
 	armv7pmu.name		= "ARMv7 Cortex-A8";
 	armv7pmu.map_event	= armv7_a8_map_event;
@@ -1264,7 +1264,7 @@ static struct arm_pmu *__init armv7_a8_pmu_init(void)
 	return &armv7pmu;
 }
 
-static struct arm_pmu *__init armv7_a9_pmu_init(void)
+static struct arm_pmu *__devinit armv7_a9_pmu_init(void)
 {
 	armv7pmu.name		= "ARMv7 Cortex-A9";
 	armv7pmu.map_event	= armv7_a9_map_event;
@@ -1272,7 +1272,7 @@ static struct arm_pmu *__init armv7_a9_pmu_init(void)
 	return &armv7pmu;
 }
 
-static struct arm_pmu *__init armv7_a5_pmu_init(void)
+static struct arm_pmu *__devinit armv7_a5_pmu_init(void)
 {
 	armv7pmu.name		= "ARMv7 Cortex-A5";
 	armv7pmu.map_event	= armv7_a5_map_event;
@@ -1280,7 +1280,7 @@ static struct arm_pmu *__init armv7_a5_pmu_init(void)
 	return &armv7pmu;
 }
 
-static struct arm_pmu *__init armv7_a15_pmu_init(void)
+static struct arm_pmu *__devinit armv7_a15_pmu_init(void)
 {
 	armv7pmu.name		= "ARMv7 Cortex-A15";
 	armv7pmu.map_event	= armv7_a15_map_event;
@@ -1289,7 +1289,7 @@ static struct arm_pmu *__init armv7_a15_pmu_init(void)
 	return &armv7pmu;
 }
 
-static struct arm_pmu *__init armv7_a7_pmu_init(void)
+static struct arm_pmu *__devinit armv7_a7_pmu_init(void)
 {
 	armv7pmu.name		= "ARMv7 Cortex-A7";
 	armv7pmu.map_event	= armv7_a7_map_event;
@@ -1298,27 +1298,27 @@ static struct arm_pmu *__init armv7_a7_pmu_init(void)
 	return &armv7pmu;
 }
 #else
-static struct arm_pmu *__init armv7_a8_pmu_init(void)
+static struct arm_pmu *__devinit armv7_a8_pmu_init(void)
 {
 	return NULL;
 }
 
-static struct arm_pmu *__init armv7_a9_pmu_init(void)
+static struct arm_pmu *__devinit armv7_a9_pmu_init(void)
 {
 	return NULL;
 }
 
-static struct arm_pmu *__init armv7_a5_pmu_init(void)
+static struct arm_pmu *__devinit armv7_a5_pmu_init(void)
 {
 	return NULL;
 }
 
-static struct arm_pmu *__init armv7_a15_pmu_init(void)
+static struct arm_pmu *__devinit armv7_a15_pmu_init(void)
 {
 	return NULL;
 }
 
-static struct arm_pmu *__init armv7_a7_pmu_init(void)
+static struct arm_pmu *__devinit armv7_a7_pmu_init(void)
 {
 	return NULL;
 }
diff --git a/arch/arm/kernel/perf_event_xscale.c b/arch/arm/kernel/perf_event_xscale.c
index f759fe0bab63..426e19f380a2 100644
--- a/arch/arm/kernel/perf_event_xscale.c
+++ b/arch/arm/kernel/perf_event_xscale.c
@@ -430,7 +430,7 @@ xscale1pmu_write_counter(int counter, u32 val)
 
 static int xscale_map_event(struct perf_event *event)
 {
-	return map_cpu_event(event, &xscale_perf_map,
+	return armpmu_map_event(event, &xscale_perf_map,
 				&xscale_perf_cache_map, 0xFF);
 }
 
@@ -449,7 +449,7 @@ static struct arm_pmu xscale1pmu = {
 	.max_period	= (1LLU << 32) - 1,
 };
 
-static struct arm_pmu *__init xscale1pmu_init(void)
+static struct arm_pmu *__devinit xscale1pmu_init(void)
 {
 	return &xscale1pmu;
 }
@@ -816,17 +816,17 @@ static struct arm_pmu xscale2pmu = {
 	.max_period	= (1LLU << 32) - 1,
 };
 
-static struct arm_pmu *__init xscale2pmu_init(void)
+static struct arm_pmu *__devinit xscale2pmu_init(void)
 {
 	return &xscale2pmu;
 }
 #else
-static struct arm_pmu *__init xscale1pmu_init(void)
+static struct arm_pmu *__devinit xscale1pmu_init(void)
 {
 	return NULL;
 }
 
-static struct arm_pmu *__init xscale2pmu_init(void)
+static struct arm_pmu *__devinit xscale2pmu_init(void)
 {
 	return NULL;
 }
diff --git a/arch/arm/kernel/pmu.c b/arch/arm/kernel/pmu.c
deleted file mode 100644
index 2334bf8a650a..000000000000
--- a/arch/arm/kernel/pmu.c
+++ /dev/null
@@ -1,36 +0,0 @@
-/*
- *  linux/arch/arm/kernel/pmu.c
- *
- *  Copyright (C) 2009 picoChip Designs Ltd, Jamie Iles
- *  Copyright (C) 2010 ARM Ltd, Will Deacon
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- */
-
-#include <linux/err.h>
-#include <linux/kernel.h>
-#include <linux/module.h>
-
-#include <asm/pmu.h>
-
-/*
- * PMU locking to ensure mutual exclusion between different subsystems.
- */
-static unsigned long pmu_lock[BITS_TO_LONGS(ARM_NUM_PMU_DEVICES)];
-
-int
-reserve_pmu(enum arm_pmu_type type)
-{
-	return test_and_set_bit_lock(type, pmu_lock) ? -EBUSY : 0;
-}
-EXPORT_SYMBOL_GPL(reserve_pmu);
-
-void
-release_pmu(enum arm_pmu_type type)
-{
-	clear_bit_unlock(type, pmu_lock);
-}
-EXPORT_SYMBOL_GPL(release_pmu);