[deliverable/linux.git] / arch / x86 / oprofile / nmi_int.c

/**
 * @file nmi_int.c
 *
 * @remark Copyright 2002-2009 OProfile authors
 * @remark Read the file COPYING
 *
 * @author John Levon <levon@movementarian.org>
 * @author Robert Richter <robert.richter@amd.com>
 * @author Barry Kasindorf <barry.kasindorf@amd.com>
 * @author Jason Yeh <jason.yeh@amd.com>
 * @author Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
 */

#include <linux/init.h>
#include <linux/notifier.h>
#include <linux/smp.h>
#include <linux/oprofile.h>
#include <linux/sysdev.h>
#include <linux/slab.h>
#include <linux/moduleparam.h>
#include <linux/kdebug.h>
#include <linux/cpu.h>
#include <asm/nmi.h>
#include <asm/msr.h>
#include <asm/apic.h>

#include "op_counter.h"
#include "op_x86_model.h"


#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
DEFINE_PER_CPU(int, switch_index);
#endif


static struct op_x86_model_spec const *model;
static DEFINE_PER_CPU(struct op_msrs, cpu_msrs);
static DEFINE_PER_CPU(unsigned long, saved_lvtpc);

/* 0 == registered but off, 1 == registered and on */
static int nmi_enabled = 0;


#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
extern atomic_t multiplex_counter;
#endif

struct op_counter_config counter_config[OP_MAX_COUNTER];

/* common functions */

u64 op_x86_get_ctrl(struct op_x86_model_spec const *model,
		    struct op_counter_config *counter_config)
{
	u64 val = 0;
	u16 event = (u16)counter_config->event;

	val |= ARCH_PERFMON_EVENTSEL_INT;
	val |= counter_config->user ? ARCH_PERFMON_EVENTSEL_USR : 0;
	val |= counter_config->kernel ? ARCH_PERFMON_EVENTSEL_OS : 0;
	val |= (counter_config->unit_mask & 0xFF) << 8;
	event &= model->event_mask ? model->event_mask : 0xFF;
	val |= event & 0xFF;
	val |= (event & 0x0F00) << 24;

	return val;
}


static int profile_exceptions_notify(struct notifier_block *self,
				     unsigned long val, void *data)
{
	struct die_args *args = (struct die_args *)data;
	int ret = NOTIFY_DONE;
	int cpu = smp_processor_id();

	switch (val) {
	case DIE_NMI:
	case DIE_NMI_IPI:
		model->check_ctrs(args->regs, &per_cpu(cpu_msrs, cpu));
		ret = NOTIFY_STOP;
		break;
	default:
		break;
	}
	return ret;
}

static void nmi_cpu_save_registers(struct op_msrs *msrs)
{
	struct op_msr *counters = msrs->counters;
	struct op_msr *controls = msrs->controls;
	unsigned int i;

	for (i = 0; i < model->num_counters; ++i) {
		if (counters[i].addr)
			rdmsrl(counters[i].addr, counters[i].saved);
	}

	for (i = 0; i < model->num_controls; ++i) {
		if (controls[i].addr)
			rdmsrl(controls[i].addr, controls[i].saved);
	}
}

static void free_msrs(void)
{
	int i;
	for_each_possible_cpu(i) {
		kfree(per_cpu(cpu_msrs, i).counters);
		per_cpu(cpu_msrs, i).counters = NULL;
		kfree(per_cpu(cpu_msrs, i).controls);
		per_cpu(cpu_msrs, i).controls = NULL;

#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
		kfree(per_cpu(cpu_msrs, i).multiplex);
		per_cpu(cpu_msrs, i).multiplex = NULL;
#endif
	}
}

static int allocate_msrs(void)
{
	int success = 1;
	size_t controls_size = sizeof(struct op_msr) * model->num_controls;
	size_t counters_size = sizeof(struct op_msr) * model->num_counters;
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	size_t multiplex_size = sizeof(struct op_msr) * model->num_virt_counters;
#endif

	int i;
	for_each_possible_cpu(i) {
		per_cpu(cpu_msrs, i).counters = kmalloc(counters_size,
								GFP_KERNEL);
		if (!per_cpu(cpu_msrs, i).counters) {
			success = 0;
			break;
		}
		per_cpu(cpu_msrs, i).controls = kmalloc(controls_size,
								GFP_KERNEL);
		if (!per_cpu(cpu_msrs, i).controls) {
			success = 0;
			break;
		}
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
		per_cpu(cpu_msrs, i).multiplex =
				kmalloc(multiplex_size, GFP_KERNEL);
		if (!per_cpu(cpu_msrs, i).multiplex) {
			success = 0;
			break;
		}
#endif
	}

	if (!success)
		free_msrs();

	return success;
}

#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX

static void nmi_setup_cpu_mux(struct op_msrs const * const msrs)
{
	int i;
	struct op_msr *multiplex = msrs->multiplex;

	for (i = 0; i < model->num_virt_counters; ++i) {
		if (counter_config[i].enabled) {
			multiplex[i].saved = -(u64)counter_config[i].count;
		} else {
			multiplex[i].addr  = 0;
			multiplex[i].saved = 0;
		}
	}
}

#endif

static void nmi_cpu_setup(void *dummy)
{
	int cpu = smp_processor_id();
	struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
	nmi_cpu_save_registers(msrs);
	spin_lock(&oprofilefs_lock);
	model->setup_ctrs(model, msrs);
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	nmi_setup_cpu_mux(msrs);
#endif
	spin_unlock(&oprofilefs_lock);
	per_cpu(saved_lvtpc, cpu) = apic_read(APIC_LVTPC);
	apic_write(APIC_LVTPC, APIC_DM_NMI);
}

static struct notifier_block profile_exceptions_nb = {
	.notifier_call = profile_exceptions_notify,
	.next = NULL,
	.priority = 2
};

static int nmi_setup(void)
{
	int err = 0;
	int cpu;

	if (!allocate_msrs())
		return -ENOMEM;

	err = register_die_notifier(&profile_exceptions_nb);
	if (err) {
		free_msrs();
		return err;
	}

	/* We need to serialize save and setup for HT because the subset
	 * of msrs are distinct for save and setup operations
	 */

	/* Assume saved/restored counters are the same on all CPUs */
	model->fill_in_addresses(&per_cpu(cpu_msrs, 0));
	for_each_possible_cpu(cpu) {
		if (cpu != 0) {
			memcpy(per_cpu(cpu_msrs, cpu).counters,
				per_cpu(cpu_msrs, 0).counters,
				sizeof(struct op_msr) * model->num_counters);

			memcpy(per_cpu(cpu_msrs, cpu).controls,
				per_cpu(cpu_msrs, 0).controls,
				sizeof(struct op_msr) * model->num_controls);
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
			memcpy(per_cpu(cpu_msrs, cpu).multiplex,
				per_cpu(cpu_msrs, 0).multiplex,
				sizeof(struct op_msr) * model->num_virt_counters);
#endif
		}
	}
	on_each_cpu(nmi_cpu_setup, NULL, 1);
	nmi_enabled = 1;
	return 0;
}

#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX

static void nmi_cpu_save_mpx_registers(struct op_msrs *msrs)
{
	unsigned int si = __get_cpu_var(switch_index);
	struct op_msr *multiplex = msrs->multiplex;
	unsigned int i;

	for (i = 0; i < model->num_counters; ++i) {
		int offset = i + si;
		if (multiplex[offset].addr) {
			rdmsrl(multiplex[offset].addr,
			       multiplex[offset].saved);
		}
	}
}

static void nmi_cpu_restore_mpx_registers(struct op_msrs *msrs)
{
	unsigned int si = __get_cpu_var(switch_index);
	struct op_msr *multiplex = msrs->multiplex;
	unsigned int i;

	for (i = 0; i < model->num_counters; ++i) {
		int offset = i + si;
		if (multiplex[offset].addr) {
			wrmsrl(multiplex[offset].addr,
			       multiplex[offset].saved);
		}
	}
}

#endif

static void nmi_cpu_restore_registers(struct op_msrs *msrs)
{
	struct op_msr *counters = msrs->counters;
	struct op_msr *controls = msrs->controls;
	unsigned int i;

	for (i = 0; i < model->num_controls; ++i) {
		if (controls[i].addr)
			wrmsrl(controls[i].addr, controls[i].saved);
	}

	for (i = 0; i < model->num_counters; ++i) {
		if (counters[i].addr)
			wrmsrl(counters[i].addr, counters[i].saved);
	}
}

static void nmi_cpu_shutdown(void *dummy)
{
	unsigned int v;
	int cpu = smp_processor_id();
	struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);

	/* restoring APIC_LVTPC can trigger an apic error because the delivery
	 * mode and vector nr combination can be illegal. That's by design: on
	 * power on apic lvt contain a zero vector nr which are legal only for
	 * NMI delivery mode. So inhibit apic err before restoring lvtpc
	 */
	v = apic_read(APIC_LVTERR);
	apic_write(APIC_LVTERR, v | APIC_LVT_MASKED);
	apic_write(APIC_LVTPC, per_cpu(saved_lvtpc, cpu));
	apic_write(APIC_LVTERR, v);
	nmi_cpu_restore_registers(msrs);
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	per_cpu(switch_index, cpu) = 0;
#endif
}

static void nmi_shutdown(void)
{
	struct op_msrs *msrs;

	nmi_enabled = 0;
	on_each_cpu(nmi_cpu_shutdown, NULL, 1);
	unregister_die_notifier(&profile_exceptions_nb);
	msrs = &get_cpu_var(cpu_msrs);
	model->shutdown(msrs);
	free_msrs();
	put_cpu_var(cpu_msrs);
}

static void nmi_cpu_start(void *dummy)
{
	struct op_msrs const *msrs = &__get_cpu_var(cpu_msrs);
	model->start(msrs);
}

static int nmi_start(void)
{
	on_each_cpu(nmi_cpu_start, NULL, 1);
	return 0;
}

static void nmi_cpu_stop(void *dummy)
{
	struct op_msrs const *msrs = &__get_cpu_var(cpu_msrs);
	model->stop(msrs);
}

static void nmi_stop(void)
{
	on_each_cpu(nmi_cpu_stop, NULL, 1);
}

static int nmi_create_files(struct super_block *sb, struct dentry *root)
{
	unsigned int i;

	for (i = 0; i < model->num_virt_counters; ++i) {
		struct dentry *dir;
		char buf[4];

#ifndef CONFIG_OPROFILE_EVENT_MULTIPLEX
		/* quick little hack to _not_ expose a counter if it is not
		 * available for use.  This should protect userspace app.
		 * NOTE:  assumes 1:1 mapping here (that counters are organized
		 *        sequentially in their struct assignment).
		 */
		if (unlikely(!avail_to_resrv_perfctr_nmi_bit(i)))
			continue;
#endif /* CONFIG_OPROFILE_EVENT_MULTIPLEX */

		snprintf(buf,  sizeof(buf), "%d", i);
		dir = oprofilefs_mkdir(sb, root, buf);
		oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
		oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
		oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
		oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
		oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
		oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
	}

	return 0;
}

#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX

static void nmi_cpu_switch(void *dummy)
{
	int cpu = smp_processor_id();
	int si = per_cpu(switch_index, cpu);
	struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);

	nmi_cpu_stop(NULL);
	nmi_cpu_save_mpx_registers(msrs);

	/* move to next set */
	si += model->num_counters;
	if ((si > model->num_virt_counters) || (counter_config[si].count == 0))
		per_cpu(switch_index, cpu) = 0;
	else
		per_cpu(switch_index, cpu) = si;

	model->switch_ctrl(model, msrs);
	nmi_cpu_restore_mpx_registers(msrs);

	nmi_cpu_start(NULL);
}


/*
 * Quick check to see if multiplexing is necessary.
 * The check should be sufficient since counters are used
 * in ordre.
 */
static int nmi_multiplex_on(void)
{
	return counter_config[model->num_counters].count ? 0 : -EINVAL;
}

static int nmi_switch_event(void)
{
	if (!model->switch_ctrl)
		return -ENOSYS;		/* not implemented */
	if (nmi_multiplex_on() < 0)
		return -EINVAL;		/* not necessary */

	on_each_cpu(nmi_cpu_switch, NULL, 1);

	atomic_inc(&multiplex_counter);

	return 0;
}

#endif

#ifdef CONFIG_SMP
static int oprofile_cpu_notifier(struct notifier_block *b, unsigned long action,
				 void *data)
{
	int cpu = (unsigned long)data;
	switch (action) {
	case CPU_DOWN_FAILED:
	case CPU_ONLINE:
		smp_call_function_single(cpu, nmi_cpu_start, NULL, 0);
		break;
	case CPU_DOWN_PREPARE:
		smp_call_function_single(cpu, nmi_cpu_stop, NULL, 1);
		break;
	}
	return NOTIFY_DONE;
}

static struct notifier_block oprofile_cpu_nb = {
	.notifier_call = oprofile_cpu_notifier
};
#endif

#ifdef CONFIG_PM

static int nmi_suspend(struct sys_device *dev, pm_message_t state)
{
	/* Only one CPU left, just stop that one */
	if (nmi_enabled == 1)
		nmi_cpu_stop(NULL);
	return 0;
}

static int nmi_resume(struct sys_device *dev)
{
	if (nmi_enabled == 1)
		nmi_cpu_start(NULL);
	return 0;
}

static struct sysdev_class oprofile_sysclass = {
	.name		= "oprofile",
	.resume		= nmi_resume,
	.suspend	= nmi_suspend,
};

static struct sys_device device_oprofile = {
	.id	= 0,
	.cls	= &oprofile_sysclass,
};

static int __init init_sysfs(void)
{
	int error;

	error = sysdev_class_register(&oprofile_sysclass);
	if (!error)
		error = sysdev_register(&device_oprofile);
	return error;
}

static void exit_sysfs(void)
{
	sysdev_unregister(&device_oprofile);
	sysdev_class_unregister(&oprofile_sysclass);
}

#else
#define init_sysfs() do { } while (0)
#define exit_sysfs() do { } while (0)
#endif /* CONFIG_PM */

static int __init p4_init(char **cpu_type)
{
	__u8 cpu_model = boot_cpu_data.x86_model;

	if (cpu_model > 6 || cpu_model == 5)
		return 0;

#ifndef CONFIG_SMP
	*cpu_type = "i386/p4";
	model = &op_p4_spec;
	return 1;
#else
	switch (smp_num_siblings) {
	case 1:
		*cpu_type = "i386/p4";
		model = &op_p4_spec;
		return 1;

	case 2:
		*cpu_type = "i386/p4-ht";
		model = &op_p4_ht2_spec;
		return 1;
	}
#endif

	printk(KERN_INFO "oprofile: P4 HyperThreading detected with > 2 threads\n");
	printk(KERN_INFO "oprofile: Reverting to timer mode.\n");
	return 0;
}

static int force_arch_perfmon;
static int force_cpu_type(const char *str, struct kernel_param *kp)
{
	if (!strcmp(str, "arch_perfmon")) {
		force_arch_perfmon = 1;
		printk(KERN_INFO "oprofile: forcing architectural perfmon\n");
	}

	return 0;
}
module_param_call(cpu_type, force_cpu_type, NULL, NULL, 0);

static int __init ppro_init(char **cpu_type)
{
	__u8 cpu_model = boot_cpu_data.x86_model;
	struct op_x86_model_spec const *spec = &op_ppro_spec;	/* default */

	if (force_arch_perfmon && cpu_has_arch_perfmon)
		return 0;

	switch (cpu_model) {
	case 0 ... 2:
		*cpu_type = "i386/ppro";
		break;
	case 3 ... 5:
		*cpu_type = "i386/pii";
		break;
	case 6 ... 8:
	case 10 ... 11:
		*cpu_type = "i386/piii";
		break;
	case 9:
	case 13:
		*cpu_type = "i386/p6_mobile";
		break;
	case 14:
		*cpu_type = "i386/core";
		break;
	case 15: case 23:
		*cpu_type = "i386/core_2";
		break;
	case 26:
		spec = &op_arch_perfmon_spec;
		*cpu_type = "i386/core_i7";
		break;
	case 28:
		*cpu_type = "i386/atom";
		break;
	default:
		/* Unknown */
		return 0;
	}

	model = spec;
	return 1;
}

/* in order to get sysfs right */
static int using_nmi;

int __init op_nmi_init(struct oprofile_operations *ops)
{
	__u8 vendor = boot_cpu_data.x86_vendor;
	__u8 family = boot_cpu_data.x86;
	char *cpu_type = NULL;
	int ret = 0;

	if (!cpu_has_apic)
		return -ENODEV;

	switch (vendor) {
	case X86_VENDOR_AMD:
		/* Needs to be at least an Athlon (or hammer in 32bit mode) */

		switch (family) {
		case 6:
			cpu_type = "i386/athlon";
			break;
		case 0xf:
			/*
			 * Actually it could be i386/hammer too, but
			 * give user space an consistent name.
			 */
			cpu_type = "x86-64/hammer";
			break;
		case 0x10:
			cpu_type = "x86-64/family10";
			break;
		case 0x11:
			cpu_type = "x86-64/family11h";
			break;
		default:
			return -ENODEV;
		}
		model = &op_amd_spec;
		break;

	case X86_VENDOR_INTEL:
		switch (family) {
			/* Pentium IV */
		case 0xf:
			p4_init(&cpu_type);
			break;

			/* A P6-class processor */
		case 6:
			ppro_init(&cpu_type);
			break;

		default:
			break;
		}

		if (cpu_type)
			break;

		if (!cpu_has_arch_perfmon)
			return -ENODEV;

		/* use arch perfmon as fallback */
		cpu_type = "i386/arch_perfmon";
		model = &op_arch_perfmon_spec;
		break;

	default:
		return -ENODEV;
	}

#ifdef CONFIG_SMP
	register_cpu_notifier(&oprofile_cpu_nb);
#endif
	/* default values, can be overwritten by model */
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	__raw_get_cpu_var(switch_index) = 0;
#endif
	ops->create_files	= nmi_create_files;
	ops->setup		= nmi_setup;
	ops->shutdown		= nmi_shutdown;
	ops->start		= nmi_start;
	ops->stop		= nmi_stop;
	ops->cpu_type		= cpu_type;
#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	ops->switch_events	= nmi_switch_event;
#endif

	if (model->init)
		ret = model->init(ops);
	if (ret)
		return ret;

	init_sysfs();
	using_nmi = 1;
	printk(KERN_INFO "oprofile: using NMI interrupt.\n");
	return 0;
}

void op_nmi_exit(void)
{
	if (using_nmi) {
		exit_sysfs();
#ifdef CONFIG_SMP
		unregister_cpu_notifier(&oprofile_cpu_nb);
#endif
	}
	if (model->exit)
		model->exit();
}
Commit	Line	Data
1da177e4 LT	1	/**
	2	* @file nmi_int.c
	3	*
4d4036e0	4	* @remark Copyright 2002-2009 OProfile authors
1da177e4 LT	5	* @remark Read the file COPYING
	6	*
	7	* @author John Levon <levon@movementarian.org>
adf5ec0b	8	* @author Robert Richter <robert.richter@amd.com>
4d4036e0 JY	9	* @author Barry Kasindorf <barry.kasindorf@amd.com>
	10	* @author Jason Yeh <jason.yeh@amd.com>
	11	* @author Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
1da177e4 LT	12	*/
	13
	14	#include <linux/init.h>
	15	#include <linux/notifier.h>
	16	#include <linux/smp.h>
	17	#include <linux/oprofile.h>
	18	#include <linux/sysdev.h>
	19	#include <linux/slab.h>
1cfcea1b	20	#include <linux/moduleparam.h>
1eeb66a1	21	#include <linux/kdebug.h>
80a8c9ff	22	#include <linux/cpu.h>
1da177e4 LT	23	#include <asm/nmi.h>
	24	#include <asm/msr.h>
	25	#include <asm/apic.h>
b75f53db	26
1da177e4 LT	27	#include "op_counter.h"
1da177e4 LT	28	#include "op_x86_model.h"
2fbe7b25	29
4d4036e0 JY	30
	31	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	32	DEFINE_PER_CPU(int, switch_index);
	33	#endif
	34
	35
b75f53db	36	static struct op_x86_model_spec const *model;
d18d00f5 MT	37	static DEFINE_PER_CPU(struct op_msrs, cpu_msrs);
d18d00f5 MT	38	static DEFINE_PER_CPU(unsigned long, saved_lvtpc);
2fbe7b25	39
1da177e4 LT	40	/* 0 == registered but off, 1 == registered and on */
	41	static int nmi_enabled = 0;
	42
4d4036e0 JY	43
	44	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	45	extern atomic_t multiplex_counter;
	46	#endif
	47
	48	struct op_counter_config counter_config[OP_MAX_COUNTER];
	49
3370d358 RR	50	/* common functions */
	51
	52	u64 op_x86_get_ctrl(struct op_x86_model_spec const *model,
	53	struct op_counter_config *counter_config)
	54	{
	55	u64 val = 0;
	56	u16 event = (u16)counter_config->event;
	57
	58	val \|= ARCH_PERFMON_EVENTSEL_INT;
	59	val \|= counter_config->user ? ARCH_PERFMON_EVENTSEL_USR : 0;
	60	val \|= counter_config->kernel ? ARCH_PERFMON_EVENTSEL_OS : 0;
	61	val \|= (counter_config->unit_mask & 0xFF) << 8;
	62	event &= model->event_mask ? model->event_mask : 0xFF;
	63	val \|= event & 0xFF;
	64	val \|= (event & 0x0F00) << 24;
	65
	66	return val;
	67	}
	68
	69
c7c19f8e AB	70	static int profile_exceptions_notify(struct notifier_block *self,
c7c19f8e AB	71	unsigned long val, void *data)
1da177e4	72	{
2fbe7b25 DZ	73	struct die_args args = (struct die_args )data;
	74	int ret = NOTIFY_DONE;
	75	int cpu = smp_processor_id();
	76
b75f53db	77	switch (val) {
2fbe7b25	78	case DIE_NMI:
5b75af0a MG	79	case DIE_NMI_IPI:
	80	model->check_ctrs(args->regs, &per_cpu(cpu_msrs, cpu));
	81	ret = NOTIFY_STOP;
2fbe7b25 DZ	82	break;
	83	default:
	84	break;
	85	}
	86	return ret;
1da177e4	87	}
2fbe7b25	88
b75f53db	89	static void nmi_cpu_save_registers(struct op_msrs *msrs)
1da177e4	90	{
b75f53db CM	91	struct op_msr *counters = msrs->counters;
b75f53db CM	92	struct op_msr *controls = msrs->controls;
1da177e4 LT	93	unsigned int i;
1da177e4 LT	94
1a245c45	95	for (i = 0; i < model->num_counters; ++i) {
95e74e62 RR	96	if (counters[i].addr)
95e74e62 RR	97	rdmsrl(counters[i].addr, counters[i].saved);
1da177e4	98	}
b75f53db	99
1a245c45	100	for (i = 0; i < model->num_controls; ++i) {
95e74e62 RR	101	if (controls[i].addr)
95e74e62 RR	102	rdmsrl(controls[i].addr, controls[i].saved);
1da177e4 LT	103	}
	104	}
	105
1da177e4 LT	106	static void free_msrs(void)
	107	{
	108	int i;
c8912599	109	for_each_possible_cpu(i) {
d18d00f5 MT	110	kfree(per_cpu(cpu_msrs, i).counters);
	111	per_cpu(cpu_msrs, i).counters = NULL;
	112	kfree(per_cpu(cpu_msrs, i).controls);
	113	per_cpu(cpu_msrs, i).controls = NULL;
4d4036e0 JY	114
	115	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	116	kfree(per_cpu(cpu_msrs, i).multiplex);
	117	per_cpu(cpu_msrs, i).multiplex = NULL;
	118	#endif
1da177e4 LT	119	}
	120	}
	121
1da177e4 LT	122	static int allocate_msrs(void)
1da177e4 LT	123	{
4c168eaf	124	int success = 1;
1da177e4 LT	125	size_t controls_size = sizeof(struct op_msr) * model->num_controls;
1da177e4 LT	126	size_t counters_size = sizeof(struct op_msr) * model->num_counters;
4d4036e0 JY	127	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	128	size_t multiplex_size = sizeof(struct op_msr) * model->num_virt_counters;
	129	#endif
1da177e4	130
4c168eaf	131	int i;
0939c17c	132	for_each_possible_cpu(i) {
d18d00f5 MT	133	per_cpu(cpu_msrs, i).counters = kmalloc(counters_size,
	134	GFP_KERNEL);
	135	if (!per_cpu(cpu_msrs, i).counters) {
1da177e4 LT	136	success = 0;
	137	break;
	138	}
4c168eaf RR	139	per_cpu(cpu_msrs, i).controls = kmalloc(controls_size,
4c168eaf RR	140	GFP_KERNEL);
d18d00f5	141	if (!per_cpu(cpu_msrs, i).controls) {
1da177e4 LT	142	success = 0;
	143	break;
	144	}
4d4036e0 JY	145	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	146	per_cpu(cpu_msrs, i).multiplex =
	147	kmalloc(multiplex_size, GFP_KERNEL);
	148	if (!per_cpu(cpu_msrs, i).multiplex) {
	149	success = 0;
	150	break;
	151	}
	152	#endif
1da177e4 LT	153	}
	154
	155	if (!success)
	156	free_msrs();
	157
	158	return success;
	159	}
	160
4d4036e0 JY	161	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	162
	163	static void nmi_setup_cpu_mux(struct op_msrs const * const msrs)
	164	{
	165	int i;
	166	struct op_msr *multiplex = msrs->multiplex;
	167
	168	for (i = 0; i < model->num_virt_counters; ++i) {
	169	if (counter_config[i].enabled) {
	170	multiplex[i].saved = -(u64)counter_config[i].count;
	171	} else {
	172	multiplex[i].addr = 0;
	173	multiplex[i].saved = 0;
	174	}
	175	}
	176	}
	177
	178	#endif
	179
b75f53db	180	static void nmi_cpu_setup(void *dummy)
1da177e4 LT	181	{
1da177e4 LT	182	int cpu = smp_processor_id();
d18d00f5	183	struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
44ab9a6b	184	nmi_cpu_save_registers(msrs);
1da177e4	185	spin_lock(&oprofilefs_lock);
ef8828dd	186	model->setup_ctrs(model, msrs);
4d4036e0 JY	187	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	188	nmi_setup_cpu_mux(msrs);
	189	#endif
1da177e4	190	spin_unlock(&oprofilefs_lock);
d18d00f5	191	per_cpu(saved_lvtpc, cpu) = apic_read(APIC_LVTPC);
1da177e4 LT	192	apic_write(APIC_LVTPC, APIC_DM_NMI);
	193	}
	194
2fbe7b25 DZ	195	static struct notifier_block profile_exceptions_nb = {
	196	.notifier_call = profile_exceptions_notify,
	197	.next = NULL,
5b75af0a	198	.priority = 2
2fbe7b25	199	};
1da177e4 LT	200
	201	static int nmi_setup(void)
	202	{
b75f53db	203	int err = 0;
6c977aad	204	int cpu;
2fbe7b25	205
1da177e4 LT	206	if (!allocate_msrs())
	207	return -ENOMEM;
	208
b75f53db CM	209	err = register_die_notifier(&profile_exceptions_nb);
b75f53db CM	210	if (err) {
1da177e4	211	free_msrs();
2fbe7b25	212	return err;
1da177e4	213	}
2fbe7b25	214
4c168eaf	215	/* We need to serialize save and setup for HT because the subset
1da177e4 LT	216	* of msrs are distinct for save and setup operations
1da177e4 LT	217	*/
6c977aad AK	218
6c977aad AK	219	/* Assume saved/restored counters are the same on all CPUs */
d18d00f5	220	model->fill_in_addresses(&per_cpu(cpu_msrs, 0));
b75f53db	221	for_each_possible_cpu(cpu) {
0939c17c	222	if (cpu != 0) {
d18d00f5 MT	223	memcpy(per_cpu(cpu_msrs, cpu).counters,
d18d00f5 MT	224	per_cpu(cpu_msrs, 0).counters,
0939c17c CW	225	sizeof(struct op_msr) * model->num_counters);
0939c17c CW	226
d18d00f5 MT	227	memcpy(per_cpu(cpu_msrs, cpu).controls,
d18d00f5 MT	228	per_cpu(cpu_msrs, 0).controls,
0939c17c	229	sizeof(struct op_msr) * model->num_controls);
4d4036e0 JY	230	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	231	memcpy(per_cpu(cpu_msrs, cpu).multiplex,
	232	per_cpu(cpu_msrs, 0).multiplex,
	233	sizeof(struct op_msr) * model->num_virt_counters);
	234	#endif
0939c17c	235	}
6c977aad	236	}
15c8b6c1	237	on_each_cpu(nmi_cpu_setup, NULL, 1);
1da177e4 LT	238	nmi_enabled = 1;
	239	return 0;
	240	}
	241
4d4036e0 JY	242	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	243
	244	static void nmi_cpu_save_mpx_registers(struct op_msrs *msrs)
	245	{
	246	unsigned int si = __get_cpu_var(switch_index);
	247	struct op_msr *multiplex = msrs->multiplex;
	248	unsigned int i;
	249
	250	for (i = 0; i < model->num_counters; ++i) {
	251	int offset = i + si;
	252	if (multiplex[offset].addr) {
	253	rdmsrl(multiplex[offset].addr,
	254	multiplex[offset].saved);
	255	}
	256	}
	257	}
	258
	259	static void nmi_cpu_restore_mpx_registers(struct op_msrs *msrs)
	260	{
	261	unsigned int si = __get_cpu_var(switch_index);
	262	struct op_msr *multiplex = msrs->multiplex;
	263	unsigned int i;
	264
	265	for (i = 0; i < model->num_counters; ++i) {
	266	int offset = i + si;
	267	if (multiplex[offset].addr) {
	268	wrmsrl(multiplex[offset].addr,
	269	multiplex[offset].saved);
	270	}
	271	}
	272	}
	273
	274	#endif
	275
44ab9a6b	276	static void nmi_cpu_restore_registers(struct op_msrs *msrs)
1da177e4	277	{
b75f53db CM	278	struct op_msr *counters = msrs->counters;
b75f53db CM	279	struct op_msr *controls = msrs->controls;
1da177e4 LT	280	unsigned int i;
1da177e4 LT	281
1a245c45	282	for (i = 0; i < model->num_controls; ++i) {
95e74e62 RR	283	if (controls[i].addr)
95e74e62 RR	284	wrmsrl(controls[i].addr, controls[i].saved);
1da177e4	285	}
b75f53db	286
1a245c45	287	for (i = 0; i < model->num_counters; ++i) {
95e74e62 RR	288	if (counters[i].addr)
95e74e62 RR	289	wrmsrl(counters[i].addr, counters[i].saved);
1da177e4 LT	290	}
1da177e4 LT	291	}
1da177e4	292
b75f53db	293	static void nmi_cpu_shutdown(void *dummy)
1da177e4 LT	294	{
	295	unsigned int v;
	296	int cpu = smp_processor_id();
82a22528	297	struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
b75f53db	298
1da177e4 LT	299	/* restoring APIC_LVTPC can trigger an apic error because the delivery
	300	* mode and vector nr combination can be illegal. That's by design: on
	301	* power on apic lvt contain a zero vector nr which are legal only for
	302	* NMI delivery mode. So inhibit apic err before restoring lvtpc
	303	*/
	304	v = apic_read(APIC_LVTERR);
	305	apic_write(APIC_LVTERR, v \| APIC_LVT_MASKED);
d18d00f5	306	apic_write(APIC_LVTPC, per_cpu(saved_lvtpc, cpu));
1da177e4	307	apic_write(APIC_LVTERR, v);
44ab9a6b	308	nmi_cpu_restore_registers(msrs);
4d4036e0	309	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
82a22528	310	per_cpu(switch_index, cpu) = 0;
4d4036e0	311	#endif
1da177e4 LT	312	}
1da177e4 LT	313
1da177e4 LT	314	static void nmi_shutdown(void)
1da177e4 LT	315	{
b61e06f2 AR	316	struct op_msrs *msrs;
b61e06f2 AR	317
1da177e4	318	nmi_enabled = 0;
15c8b6c1	319	on_each_cpu(nmi_cpu_shutdown, NULL, 1);
2fbe7b25	320	unregister_die_notifier(&profile_exceptions_nb);
b61e06f2	321	msrs = &get_cpu_var(cpu_msrs);
d18d00f5	322	model->shutdown(msrs);
1da177e4	323	free_msrs();
93e1ade5	324	put_cpu_var(cpu_msrs);
1da177e4 LT	325	}
1da177e4 LT	326
b75f53db	327	static void nmi_cpu_start(void *dummy)
1da177e4	328	{
d18d00f5	329	struct op_msrs const *msrs = &__get_cpu_var(cpu_msrs);
1da177e4 LT	330	model->start(msrs);
1da177e4 LT	331	}
1da177e4 LT	332
	333	static int nmi_start(void)
	334	{
15c8b6c1	335	on_each_cpu(nmi_cpu_start, NULL, 1);
1da177e4 LT	336	return 0;
1da177e4 LT	337	}
b75f53db CM	338
b75f53db CM	339	static void nmi_cpu_stop(void *dummy)
1da177e4	340	{
d18d00f5	341	struct op_msrs const *msrs = &__get_cpu_var(cpu_msrs);
1da177e4 LT	342	model->stop(msrs);
1da177e4 LT	343	}
b75f53db	344
1da177e4 LT	345	static void nmi_stop(void)
1da177e4 LT	346	{
15c8b6c1	347	on_each_cpu(nmi_cpu_stop, NULL, 1);
1da177e4 LT	348	}
1da177e4 LT	349
b75f53db	350	static int nmi_create_files(struct super_block sb, struct dentry root)
1da177e4 LT	351	{
	352	unsigned int i;
	353
4d4036e0	354	for (i = 0; i < model->num_virt_counters; ++i) {
b75f53db	355	struct dentry *dir;
0c6856f7	356	char buf[4];
b75f53db	357
4d4036e0	358	#ifndef CONFIG_OPROFILE_EVENT_MULTIPLEX
b75f53db	359	/* quick little hack to _not_ expose a counter if it is not
cb9c448c DZ	360	* available for use. This should protect userspace app.
	361	* NOTE: assumes 1:1 mapping here (that counters are organized
	362	* sequentially in their struct assignment).
	363	*/
	364	if (unlikely(!avail_to_resrv_perfctr_nmi_bit(i)))
	365	continue;
4d4036e0	366	#endif /* CONFIG_OPROFILE_EVENT_MULTIPLEX */
cb9c448c	367
0c6856f7	368	snprintf(buf, sizeof(buf), "%d", i);
1da177e4	369	dir = oprofilefs_mkdir(sb, root, buf);
b75f53db CM	370	oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
	371	oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
	372	oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
	373	oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
	374	oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
	375	oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
1da177e4 LT	376	}
	377
	378	return 0;
	379	}
b75f53db	380
4d4036e0 JY	381	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	382
	383	static void nmi_cpu_switch(void *dummy)
	384	{
	385	int cpu = smp_processor_id();
	386	int si = per_cpu(switch_index, cpu);
	387	struct op_msrs *msrs = &per_cpu(cpu_msrs, cpu);
	388
	389	nmi_cpu_stop(NULL);
	390	nmi_cpu_save_mpx_registers(msrs);
	391
	392	/* move to next set */
	393	si += model->num_counters;
	394	if ((si > model->num_virt_counters) \|\| (counter_config[si].count == 0))
	395	per_cpu(switch_index, cpu) = 0;
	396	else
	397	per_cpu(switch_index, cpu) = si;
	398
	399	model->switch_ctrl(model, msrs);
	400	nmi_cpu_restore_mpx_registers(msrs);
	401
	402	nmi_cpu_start(NULL);
	403	}
	404
	405
	406	/*
	407	* Quick check to see if multiplexing is necessary.
	408	* The check should be sufficient since counters are used
	409	* in ordre.
	410	*/
	411	static int nmi_multiplex_on(void)
	412	{
	413	return counter_config[model->num_counters].count ? 0 : -EINVAL;
	414	}
	415
	416	static int nmi_switch_event(void)
	417	{
	418	if (!model->switch_ctrl)
	419	return -ENOSYS; /* not implemented */
	420	if (nmi_multiplex_on() < 0)
	421	return -EINVAL; /* not necessary */
	422
	423	on_each_cpu(nmi_cpu_switch, NULL, 1);
	424
	425	atomic_inc(&multiplex_counter);
	426
	427	return 0;
	428	}
	429
	430	#endif
	431
69046d43 RR	432	#ifdef CONFIG_SMP
	433	static int oprofile_cpu_notifier(struct notifier_block *b, unsigned long action,
	434	void *data)
	435	{
	436	int cpu = (unsigned long)data;
	437	switch (action) {
	438	case CPU_DOWN_FAILED:
	439	case CPU_ONLINE:
	440	smp_call_function_single(cpu, nmi_cpu_start, NULL, 0);
	441	break;
	442	case CPU_DOWN_PREPARE:
	443	smp_call_function_single(cpu, nmi_cpu_stop, NULL, 1);
	444	break;
	445	}
	446	return NOTIFY_DONE;
	447	}
	448
	449	static struct notifier_block oprofile_cpu_nb = {
	450	.notifier_call = oprofile_cpu_notifier
	451	};
	452	#endif
	453
	454	#ifdef CONFIG_PM
	455
	456	static int nmi_suspend(struct sys_device *dev, pm_message_t state)
	457	{
	458	/* Only one CPU left, just stop that one */
	459	if (nmi_enabled == 1)
	460	nmi_cpu_stop(NULL);
	461	return 0;
	462	}
	463
	464	static int nmi_resume(struct sys_device *dev)
	465	{
	466	if (nmi_enabled == 1)
	467	nmi_cpu_start(NULL);
	468	return 0;
	469	}
	470
	471	static struct sysdev_class oprofile_sysclass = {
	472	.name = "oprofile",
	473	.resume = nmi_resume,
	474	.suspend = nmi_suspend,
	475	};
	476
	477	static struct sys_device device_oprofile = {
	478	.id = 0,
	479	.cls = &oprofile_sysclass,
	480	};
	481
	482	static int __init init_sysfs(void)
	483	{
	484	int error;
	485
	486	error = sysdev_class_register(&oprofile_sysclass);
	487	if (!error)
	488	error = sysdev_register(&device_oprofile);
	489	return error;
	490	}
	491
	492	static void exit_sysfs(void)
	493	{
	494	sysdev_unregister(&device_oprofile);
	495	sysdev_class_unregister(&oprofile_sysclass);
496	}
497
498	#else
499	#define init_sysfs() do { } while (0)
500	#define exit_sysfs() do { } while (0)
501	#endif /* CONFIG_PM */
502
b75f53db	503	static int __init p4_init(char **cpu_type)
1da177e4 LT	504	{
	505	__u8 cpu_model = boot_cpu_data.x86_model;
	506
1f3d7b60	507	if (cpu_model > 6 \|\| cpu_model == 5)
1da177e4 LT	508	return 0;
	509
	510	#ifndef CONFIG_SMP
	511	*cpu_type = "i386/p4";
	512	model = &op_p4_spec;
	513	return 1;
	514	#else
	515	switch (smp_num_siblings) {
b75f53db CM	516	case 1:
	517	*cpu_type = "i386/p4";
	518	model = &op_p4_spec;
	519	return 1;
	520
	521	case 2:
	522	*cpu_type = "i386/p4-ht";
	523	model = &op_p4_ht2_spec;
	524	return 1;
1da177e4 LT	525	}
	526	#endif
	527
	528	printk(KERN_INFO "oprofile: P4 HyperThreading detected with > 2 threads\n");
	529	printk(KERN_INFO "oprofile: Reverting to timer mode.\n");
	530	return 0;
	531	}
	532
7e4e0bd5 RR	533	static int force_arch_perfmon;
	534	static int force_cpu_type(const char str, struct kernel_param kp)
	535	{
8d7ff4f2	536	if (!strcmp(str, "arch_perfmon")) {
7e4e0bd5 RR	537	force_arch_perfmon = 1;
	538	printk(KERN_INFO "oprofile: forcing architectural perfmon\n");
	539	}
	540
	541	return 0;
	542	}
	543	module_param_call(cpu_type, force_cpu_type, NULL, NULL, 0);
1dcdb5a9	544
b75f53db	545	static int __init ppro_init(char **cpu_type)
1da177e4 LT	546	{
1da177e4 LT	547	__u8 cpu_model = boot_cpu_data.x86_model;
802070f5	548	struct op_x86_model_spec const spec = &op_ppro_spec; / default */
1da177e4	549
1dcdb5a9 AK	550	if (force_arch_perfmon && cpu_has_arch_perfmon)
	551	return 0;
	552
4b9f12a3 LT	553	switch (cpu_model) {
	554	case 0 ... 2:
	555	*cpu_type = "i386/ppro";
	556	break;
	557	case 3 ... 5:
	558	*cpu_type = "i386/pii";
	559	break;
	560	case 6 ... 8:
3d337c65	561	case 10 ... 11:
4b9f12a3 LT	562	*cpu_type = "i386/piii";
	563	break;
	564	case 9:
3d337c65	565	case 13:
4b9f12a3 LT	566	*cpu_type = "i386/p6_mobile";
4b9f12a3 LT	567	break;
4b9f12a3	568	case 14:
64471ebe	569	*cpu_type = "i386/core";
4b9f12a3 LT	570	break;
	571	case 15: case 23:
	572	*cpu_type = "i386/core_2";
	573	break;
6adf406f	574	case 26:
802070f5	575	spec = &op_arch_perfmon_spec;
6adf406f AK	576	*cpu_type = "i386/core_i7";
	577	break;
	578	case 28:
	579	*cpu_type = "i386/atom";
	580	break;
4b9f12a3 LT	581	default:
4b9f12a3 LT	582	/* Unknown */
1da177e4	583	return 0;
1da177e4 LT	584	}
1da177e4 LT	585
802070f5	586	model = spec;
1da177e4 LT	587	return 1;
	588	}
	589
405ae7d3	590	/* in order to get sysfs right */
1da177e4 LT	591	static int using_nmi;
1da177e4 LT	592
96d0821c	593	int __init op_nmi_init(struct oprofile_operations *ops)
1da177e4 LT	594	{
	595	__u8 vendor = boot_cpu_data.x86_vendor;
	596	__u8 family = boot_cpu_data.x86;
b9917028	597	char *cpu_type = NULL;
adf5ec0b	598	int ret = 0;
1da177e4 LT	599
	600	if (!cpu_has_apic)
	601	return -ENODEV;
b75f53db	602
1da177e4	603	switch (vendor) {
b75f53db CM	604	case X86_VENDOR_AMD:
b75f53db CM	605	/* Needs to be at least an Athlon (or hammer in 32bit mode) */
1da177e4	606
b75f53db	607	switch (family) {
b75f53db	608	case 6:
b75f53db CM	609	cpu_type = "i386/athlon";
	610	break;
	611	case 0xf:
d20f24c6 RR	612	/*
	613	* Actually it could be i386/hammer too, but
	614	* give user space an consistent name.
	615	*/
b75f53db CM	616	cpu_type = "x86-64/hammer";
	617	break;
	618	case 0x10:
b75f53db CM	619	cpu_type = "x86-64/family10";
b75f53db CM	620	break;
12f2b261	621	case 0x11:
12f2b261 BK	622	cpu_type = "x86-64/family11h";
12f2b261 BK	623	break;
d20f24c6 RR	624	default:
d20f24c6 RR	625	return -ENODEV;
b75f53db	626	}
d20f24c6	627	model = &op_amd_spec;
b75f53db CM	628	break;
	629
	630	case X86_VENDOR_INTEL:
	631	switch (family) {
	632	/* Pentium IV */
	633	case 0xf:
b9917028	634	p4_init(&cpu_type);
1da177e4	635	break;
b75f53db CM	636
	637	/* A P6-class processor */
	638	case 6:
b9917028	639	ppro_init(&cpu_type);
1da177e4 LT	640	break;
	641
	642	default:
b9917028	643	break;
b75f53db	644	}
b9917028	645
e419294e RR	646	if (cpu_type)
	647	break;
	648
	649	if (!cpu_has_arch_perfmon)
b9917028	650	return -ENODEV;
e419294e RR	651
	652	/* use arch perfmon as fallback */
	653	cpu_type = "i386/arch_perfmon";
	654	model = &op_arch_perfmon_spec;
b75f53db CM	655	break;
	656
	657	default:
	658	return -ENODEV;
1da177e4 LT	659	}
1da177e4 LT	660
80a8c9ff AK	661	#ifdef CONFIG_SMP
	662	register_cpu_notifier(&oprofile_cpu_nb);
	663	#endif
270d3e1a	664	/* default values, can be overwritten by model */
4d4036e0 JY	665	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	666	__raw_get_cpu_var(switch_index) = 0;
	667	#endif
6e63ea4b RR	668	ops->create_files = nmi_create_files;
	669	ops->setup = nmi_setup;
	670	ops->shutdown = nmi_shutdown;
	671	ops->start = nmi_start;
	672	ops->stop = nmi_stop;
	673	ops->cpu_type = cpu_type;
4d4036e0 JY	674	#ifdef CONFIG_OPROFILE_EVENT_MULTIPLEX
	675	ops->switch_events = nmi_switch_event;
	676	#endif
270d3e1a	677
adf5ec0b RR	678	if (model->init)
	679	ret = model->init(ops);
	680	if (ret)
	681	return ret;
	682
405ae7d3	683	init_sysfs();
1da177e4	684	using_nmi = 1;
1da177e4 LT	685	printk(KERN_INFO "oprofile: using NMI interrupt.\n");
	686	return 0;
	687	}
	688
96d0821c	689	void op_nmi_exit(void)
1da177e4	690	{
80a8c9ff	691	if (using_nmi) {
405ae7d3	692	exit_sysfs();
80a8c9ff AK	693	#ifdef CONFIG_SMP
	694	unregister_cpu_notifier(&oprofile_cpu_nb);
	695	#endif
	696	}
adf5ec0b RR	697	if (model->exit)
adf5ec0b RR	698	model->exit();
1da177e4	699	}