[mirror_ubuntu-zesty-kernel.git] / arch / arm / kernel / perf_event_cpu.c

/*
 * 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/slab.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->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(struct arm_pmu *cpu_pmu)
{
	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(struct arm_pmu *cpu_pmu, 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 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, cpu_pmu, 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(cpu_pmu);
	else
		return NOTIFY_DONE;

	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 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 cpu_pmu_plat_device_ids[] = {
	{.name = "arm-pmu"},
	{},
};

/*
 * CPU PMU identification and probing.
 */
static int probe_current_pmu(struct arm_pmu *pmu)
{
	int cpu = get_cpu();
	unsigned long cpuid = read_cpuid_id();
	unsigned long implementor = (cpuid & 0xFF000000) >> 24;
	unsigned long part_number = (cpuid & 0xFFF0);
	int ret = -ENODEV;

	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 */
			ret = armv6pmu_init(pmu);
			break;
		case 0xB020:	/* ARM11mpcore */
			ret = armv6mpcore_pmu_init(pmu);
			break;
		case 0xC080:	/* Cortex-A8 */
			ret = armv7_a8_pmu_init(pmu);
			break;
		case 0xC090:	/* Cortex-A9 */
			ret = armv7_a9_pmu_init(pmu);
			break;
		case 0xC050:	/* Cortex-A5 */
			ret = armv7_a5_pmu_init(pmu);
			break;
		case 0xC0F0:	/* Cortex-A15 */
			ret = armv7_a15_pmu_init(pmu);
			break;
		case 0xC070:	/* Cortex-A7 */
			ret = armv7_a7_pmu_init(pmu);
			break;
		}
	/* Intel CPUs [xscale]. */
	} else if (0x69 == implementor) {
		part_number = (cpuid >> 13) & 0x7;
		switch (part_number) {
		case 1:
			ret = xscale1pmu_init(pmu);
			break;
		case 2:
			ret = xscale2pmu_init(pmu);
			break;
		}
	}

	put_cpu();
	return ret;
}

static int cpu_pmu_device_probe(struct platform_device *pdev)
{
	const struct of_device_id *of_id;
	int (*init_fn)(struct arm_pmu *);
	struct device_node *node = pdev->dev.of_node;
	struct arm_pmu *pmu;
	int ret = -ENODEV;

	if (cpu_pmu) {
		pr_info("attempt to register multiple PMU devices!");
		return -ENOSPC;
	}

	pmu = kzalloc(sizeof(struct arm_pmu), GFP_KERNEL);
	if (!pmu) {
		pr_info("failed to allocate PMU device!");
		return -ENOMEM;
	}

	if (node && (of_id = of_match_node(cpu_pmu_of_device_ids, pdev->dev.of_node))) {
		init_fn = of_id->data;
		ret = init_fn(pmu);
	} else {
		ret = probe_current_pmu(pmu);
	}

	if (ret) {
		pr_info("failed to register PMU devices!");
		kfree(pmu);
		return ret;
	}

	cpu_pmu = pmu;
	cpu_pmu->plat_device = pdev;
	cpu_pmu_init(cpu_pmu);
	armpmu_register(cpu_pmu, 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)
{
	int err;

	err = register_cpu_notifier(&cpu_pmu_hotplug_notifier);
	if (err)
		return err;

	err = platform_driver_register(&cpu_pmu_driver);
	if (err)
		unregister_cpu_notifier(&cpu_pmu_hotplug_notifier);

	return err;
}
device_initcall(register_pmu_driver);
Commit	Line	Data
5505b206 WD	1	/*
	2	* This program is free software; you can redistribute it and/or modify
	3	* it under the terms of the GNU General Public License version 2 as
	4	* published by the Free Software Foundation.
	5	*
	6	* This program is distributed in the hope that it will be useful,
	7	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	8	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	9	* GNU General Public License for more details.
	10	*
	11	* You should have received a copy of the GNU General Public License
	12	* along with this program; if not, write to the Free Software
	13	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	14	*
	15	* Copyright (C) 2012 ARM Limited
	16	*
	17	* Author: Will Deacon <will.deacon@arm.com>
	18	*/
	19	#define pr_fmt(fmt) "CPU PMU: " fmt
	20
	21	#include <linux/bitmap.h>
	22	#include <linux/export.h>
	23	#include <linux/kernel.h>
	24	#include <linux/of.h>
	25	#include <linux/platform_device.h>
513c99ce	26	#include <linux/slab.h>
5505b206 WD	27	#include <linux/spinlock.h>
	28
	29	#include <asm/cputype.h>
	30	#include <asm/irq_regs.h>
	31	#include <asm/pmu.h>
	32
	33	/* Set at runtime when we know what CPU type we are. */
	34	static struct arm_pmu *cpu_pmu;
	35
	36	static DEFINE_PER_CPU(struct perf_event * [ARMPMU_MAX_HWEVENTS], hw_events);
	37	static DEFINE_PER_CPU(unsigned long [BITS_TO_LONGS(ARMPMU_MAX_HWEVENTS)], used_mask);
	38	static DEFINE_PER_CPU(struct pmu_hw_events, cpu_hw_events);
	39
	40	/*
	41	* Despite the names, these two functions are CPU-specific and are used
	42	* by the OProfile/perf code.
	43	*/
	44	const char *perf_pmu_name(void)
	45	{
	46	if (!cpu_pmu)
	47	return NULL;
	48
0305230a	49	return cpu_pmu->name;
5505b206 WD	50	}
	51	EXPORT_SYMBOL_GPL(perf_pmu_name);
	52
	53	int perf_num_counters(void)
	54	{
	55	int max_events = 0;
	56
	57	if (cpu_pmu != NULL)
	58	max_events = cpu_pmu->num_events;
	59
	60	return max_events;
	61	}
	62	EXPORT_SYMBOL_GPL(perf_num_counters);
	63
	64	/* Include the PMU-specific implementations. */
	65	#include "perf_event_xscale.c"
	66	#include "perf_event_v6.c"
	67	#include "perf_event_v7.c"
	68
	69	static struct pmu_hw_events *cpu_pmu_get_cpu_events(void)
	70	{
	71	return &__get_cpu_var(cpu_hw_events);
	72	}
	73
ed6f2a52	74	static void cpu_pmu_free_irq(struct arm_pmu *cpu_pmu)
051f1b13 SH	75	{
	76	int i, irq, irqs;
	77	struct platform_device *pmu_device = cpu_pmu->plat_device;
	78
	79	irqs = min(pmu_device->num_resources, num_possible_cpus());
	80
	81	for (i = 0; i < irqs; ++i) {
	82	if (!cpumask_test_and_clear_cpu(i, &cpu_pmu->active_irqs))
	83	continue;
	84	irq = platform_get_irq(pmu_device, i);
	85	if (irq >= 0)
	86	free_irq(irq, cpu_pmu);
	87	}
	88	}
	89
ed6f2a52	90	static int cpu_pmu_request_irq(struct arm_pmu *cpu_pmu, irq_handler_t handler)
051f1b13 SH	91	{
	92	int i, err, irq, irqs;
	93	struct platform_device *pmu_device = cpu_pmu->plat_device;
	94
	95	if (!pmu_device)
	96	return -ENODEV;
	97
	98	irqs = min(pmu_device->num_resources, num_possible_cpus());
	99	if (irqs < 1) {
	100	pr_err("no irqs for PMUs defined\n");
	101	return -ENODEV;
	102	}
	103
	104	for (i = 0; i < irqs; ++i) {
	105	err = 0;
	106	irq = platform_get_irq(pmu_device, i);
	107	if (irq < 0)
	108	continue;
	109
	110	/*
	111	* If we have a single PMU interrupt that we can't shift,
	112	* assume that we're running on a uniprocessor machine and
	113	* continue. Otherwise, continue without this interrupt.
	114	*/
	115	if (irq_set_affinity(irq, cpumask_of(i)) && irqs > 1) {
	116	pr_warning("unable to set irq affinity (irq=%d, cpu=%u)\n",
	117	irq, i);
	118	continue;
	119	}
	120
	121	err = request_irq(irq, handler, IRQF_NOBALANCING, "arm-pmu",
	122	cpu_pmu);
	123	if (err) {
	124	pr_err("unable to request IRQ%d for ARM PMU counters\n",
	125	irq);
	126	return err;
	127	}
	128
	129	cpumask_set_cpu(i, &cpu_pmu->active_irqs);
	130	}
	131
	132	return 0;
	133	}
	134
351a102d	135	static void cpu_pmu_init(struct arm_pmu *cpu_pmu)
5505b206 WD	136	{
	137	int cpu;
	138	for_each_possible_cpu(cpu) {
	139	struct pmu_hw_events *events = &per_cpu(cpu_hw_events, cpu);
	140	events->events = per_cpu(hw_events, cpu);
	141	events->used_mask = per_cpu(used_mask, cpu);
	142	raw_spin_lock_init(&events->pmu_lock);
	143	}
051f1b13 SH	144
	145	cpu_pmu->get_hw_events = cpu_pmu_get_cpu_events;
	146	cpu_pmu->request_irq = cpu_pmu_request_irq;
	147	cpu_pmu->free_irq = cpu_pmu_free_irq;
5505b206 WD	148
	149	/* Ensure the PMU has sane values out of reset. */
	150	if (cpu_pmu && cpu_pmu->reset)
ed6f2a52	151	on_each_cpu(cpu_pmu->reset, cpu_pmu, 1);
5505b206 WD	152	}
	153
	154	/*
	155	* PMU hardware loses all context when a CPU goes offline.
	156	* When a CPU is hotplugged back in, since some hardware registers are
	157	* UNKNOWN at reset, the PMU must be explicitly reset to avoid reading
	158	* junk values out of them.
	159	*/
	160	static int __cpuinit cpu_pmu_notify(struct notifier_block *b,
	161	unsigned long action, void *hcpu)
	162	{
	163	if ((action & ~CPU_TASKS_FROZEN) != CPU_STARTING)
	164	return NOTIFY_DONE;
	165
	166	if (cpu_pmu && cpu_pmu->reset)
ed6f2a52	167	cpu_pmu->reset(cpu_pmu);
288700d1 WD	168	else
288700d1 WD	169	return NOTIFY_DONE;
5505b206 WD	170
	171	return NOTIFY_OK;
	172	}
	173
	174	static struct notifier_block __cpuinitdata cpu_pmu_hotplug_notifier = {
	175	.notifier_call = cpu_pmu_notify,
	176	};
	177
	178	/*
	179	* PMU platform driver and devicetree bindings.
	180	*/
351a102d	181	static struct of_device_id cpu_pmu_of_device_ids[] = {
5505b206 WD	182	{.compatible = "arm,cortex-a15-pmu", .data = armv7_a15_pmu_init},
	183	{.compatible = "arm,cortex-a9-pmu", .data = armv7_a9_pmu_init},
	184	{.compatible = "arm,cortex-a8-pmu", .data = armv7_a8_pmu_init},
	185	{.compatible = "arm,cortex-a7-pmu", .data = armv7_a7_pmu_init},
	186	{.compatible = "arm,cortex-a5-pmu", .data = armv7_a5_pmu_init},
	187	{.compatible = "arm,arm11mpcore-pmu", .data = armv6mpcore_pmu_init},
	188	{.compatible = "arm,arm1176-pmu", .data = armv6pmu_init},
	189	{.compatible = "arm,arm1136-pmu", .data = armv6pmu_init},
	190	{},
	191	};
	192
351a102d	193	static struct platform_device_id cpu_pmu_plat_device_ids[] = {
5505b206 WD	194	{.name = "arm-pmu"},
	195	{},
	196	};
	197
	198	/*
	199	* CPU PMU identification and probing.
	200	*/
351a102d	201	static int probe_current_pmu(struct arm_pmu *pmu)
5505b206	202	{
5505b206 WD	203	int cpu = get_cpu();
	204	unsigned long cpuid = read_cpuid_id();
	205	unsigned long implementor = (cpuid & 0xFF000000) >> 24;
	206	unsigned long part_number = (cpuid & 0xFFF0);
513c99ce	207	int ret = -ENODEV;
5505b206 WD	208
	209	pr_info("probing PMU on CPU %d\n", cpu);
	210
	211	/* ARM Ltd CPUs. */
	212	if (0x41 == implementor) {
	213	switch (part_number) {
	214	case 0xB360: /* ARM1136 */
	215	case 0xB560: /* ARM1156 */
	216	case 0xB760: /* ARM1176 */
513c99ce	217	ret = armv6pmu_init(pmu);
5505b206 WD	218	break;
5505b206 WD	219	case 0xB020: /* ARM11mpcore */
513c99ce	220	ret = armv6mpcore_pmu_init(pmu);
5505b206 WD	221	break;
5505b206 WD	222	case 0xC080: /* Cortex-A8 */
513c99ce	223	ret = armv7_a8_pmu_init(pmu);
5505b206 WD	224	break;
5505b206 WD	225	case 0xC090: /* Cortex-A9 */
513c99ce	226	ret = armv7_a9_pmu_init(pmu);
5505b206 WD	227	break;
5505b206 WD	228	case 0xC050: /* Cortex-A5 */
513c99ce	229	ret = armv7_a5_pmu_init(pmu);
5505b206 WD	230	break;
5505b206 WD	231	case 0xC0F0: /* Cortex-A15 */
513c99ce	232	ret = armv7_a15_pmu_init(pmu);
5505b206 WD	233	break;
5505b206 WD	234	case 0xC070: /* Cortex-A7 */
513c99ce	235	ret = armv7_a7_pmu_init(pmu);
5505b206 WD	236	break;
	237	}
	238	/* Intel CPUs [xscale]. */
	239	} else if (0x69 == implementor) {
	240	part_number = (cpuid >> 13) & 0x7;
	241	switch (part_number) {
	242	case 1:
513c99ce	243	ret = xscale1pmu_init(pmu);
5505b206 WD	244	break;
5505b206 WD	245	case 2:
513c99ce	246	ret = xscale2pmu_init(pmu);
5505b206 WD	247	break;
	248	}
	249	}
	250
	251	put_cpu();
513c99ce	252	return ret;
5505b206 WD	253	}
5505b206 WD	254
351a102d	255	static int cpu_pmu_device_probe(struct platform_device *pdev)
5505b206 WD	256	{
5505b206 WD	257	const struct of_device_id *of_id;
513c99ce	258	int (init_fn)(struct arm_pmu );
5505b206	259	struct device_node *node = pdev->dev.of_node;
513c99ce SH	260	struct arm_pmu *pmu;
513c99ce SH	261	int ret = -ENODEV;
5505b206 WD	262
	263	if (cpu_pmu) {
	264	pr_info("attempt to register multiple PMU devices!");
	265	return -ENOSPC;
	266	}
	267
513c99ce SH	268	pmu = kzalloc(sizeof(struct arm_pmu), GFP_KERNEL);
	269	if (!pmu) {
	270	pr_info("failed to allocate PMU device!");
	271	return -ENOMEM;
	272	}
	273
5505b206 WD	274	if (node && (of_id = of_match_node(cpu_pmu_of_device_ids, pdev->dev.of_node))) {
5505b206 WD	275	init_fn = of_id->data;
513c99ce	276	ret = init_fn(pmu);
5505b206	277	} else {
513c99ce	278	ret = probe_current_pmu(pmu);
5505b206 WD	279	}
5505b206 WD	280
513c99ce SH	281	if (ret) {
	282	pr_info("failed to register PMU devices!");
	283	kfree(pmu);
	284	return ret;
	285	}
5505b206	286
513c99ce	287	cpu_pmu = pmu;
5505b206 WD	288	cpu_pmu->plat_device = pdev;
5505b206 WD	289	cpu_pmu_init(cpu_pmu);
0305230a	290	armpmu_register(cpu_pmu, PERF_TYPE_RAW);
5505b206 WD	291
	292	return 0;
	293	}
	294
	295	static struct platform_driver cpu_pmu_driver = {
	296	.driver = {
	297	.name = "arm-pmu",
	298	.pm = &armpmu_dev_pm_ops,
	299	.of_match_table = cpu_pmu_of_device_ids,
	300	},
	301	.probe = cpu_pmu_device_probe,
	302	.id_table = cpu_pmu_plat_device_ids,
	303	};
	304
	305	static int __init register_pmu_driver(void)
	306	{
2a4961ba MR	307	int err;
	308
	309	err = register_cpu_notifier(&cpu_pmu_hotplug_notifier);
	310	if (err)
	311	return err;
	312
	313	err = platform_driver_register(&cpu_pmu_driver);
	314	if (err)
	315	unregister_cpu_notifier(&cpu_pmu_hotplug_notifier);
	316
	317	return err;
5505b206 WD	318	}
5505b206 WD	319	device_initcall(register_pmu_driver);