path: root/include/linux/perf_event.h

/*
 * Performance events:
 *
 *    Copyright (C) 2008-2009, Thomas Gleixner <tglx@linutronix.de>
 *    Copyright (C) 2008-2011, Red Hat, Inc., Ingo Molnar
 *    Copyright (C) 2008-2011, Red Hat, Inc., Peter Zijlstra
 *
 * Data type definitions, declarations, prototypes.
 *
 *    Started by: Thomas Gleixner and Ingo Molnar
 *
 * For licencing details see kernel-base/COPYING
 */
#ifndef _LINUX_PERF_EVENT_H
#define _LINUX_PERF_EVENT_H

#include <uapi/linux/perf_event.h>

/*
 * Kernel-internal data types and definitions:
 */

#ifdef CONFIG_PERF_EVENTS
# include <asm/perf_event.h>
# include <asm/local64.h>
#endif

struct perf_guest_info_callbacks {
	int				(*is_in_guest)(void);
	int				(*is_user_mode)(void);
	unsigned long			(*get_guest_ip)(void);
};

#ifdef CONFIG_HAVE_HW_BREAKPOINT
#include <asm/hw_breakpoint.h>
#endif

#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/rculist.h>
#include <linux/rcupdate.h>
#include <linux/spinlock.h>
#include <linux/hrtimer.h>
#include <linux/fs.h>
#include <linux/pid_namespace.h>
#include <linux/workqueue.h>
#include <linux/ftrace.h>
#include <linux/cpu.h>
#include <linux/irq_work.h>
#include <linux/static_key.h>
#include <linux/jump_label_ratelimit.h>
#include <linux/atomic.h>
#include <linux/sysfs.h>
#include <linux/perf_regs.h>
#include <linux/workqueue.h>
#include <linux/cgroup.h>
#include <asm/local.h>

struct perf_callchain_entry {
	__u64				nr;
	__u64				ip[0]; /* /proc/sys/kernel/perf_event_max_stack */
};

struct perf_callchain_entry_ctx {
	struct perf_callchain_entry *entry;
	u32			    max_stack;
	u32			    nr;
	short			    contexts;
	bool			    contexts_maxed;
};

typedef unsigned long (*perf_copy_f)(void *dst, const void *src,
				     unsigned long off, unsigned long len);

struct perf_raw_frag {
	union {
		struct perf_raw_frag	*next;
		unsigned long		pad;
	};
	perf_copy_f			copy;
	void				*data;
	u32				size;
} __packed;

struct perf_raw_record {
	struct perf_raw_frag		frag;
	u32				size;
};

/*
 * branch stack layout:
 *  nr: number of taken branches stored in entries[]
 *
 * Note that nr can vary from sample to sample
 * branches (to, from) are stored from most recent
 * to least recent, i.e., entries[0] contains the most
 * recent branch.
 */
struct perf_branch_stack {
	__u64				nr;
	struct perf_branch_entry	entries[0];
};

struct task_struct;

/*
 * extra PMU register associated with an event
 */
struct hw_perf_event_extra {
	u64		config;	/* register value */
	unsigned int	reg;	/* register address or index */
	int		alloc;	/* extra register already allocated */
	int		idx;	/* index in shared_regs->regs[] */
};

/**
 * struct hw_perf_event - performance event hardware details:
 */
struct hw_perf_event {
#ifdef CONFIG_PERF_EVENTS
	union {
		struct { /* hardware */
			u64		config;
			u64		last_tag;
			unsigned long	config_base;
			unsigned long	event_base;
			int		event_base_rdpmc;
			int		idx;
			int		last_cpu;
			int		flags;

			struct hw_perf_event_extra extra_reg;
			struct hw_perf_event_extra branch_reg;
		};
		struct { /* software */
			struct hrtimer	hrtimer;
		};
		struct { /* tracepoint */
			/* for tp_event->class */
			struct list_head	tp_list;
		};
		struct { /* intel_cqm */
			int			cqm_state;
			u32			cqm_rmid;
			int			is_group_event;
			struct list_head	cqm_events_entry;
			struct list_head	cqm_groups_entry;
			struct list_head	cqm_group_entry;
		};
		struct { /* itrace */
			int			itrace_started;
		};
		struct { /* amd_power */
			u64	pwr_acc;
			u64	ptsc;
		};
#ifdef CONFIG_HAVE_HW_BREAKPOINT
		struct { /* breakpoint */
			/*
			 * Crufty hack to avoid the chicken and egg
			 * problem hw_breakpoint has with context
			 * creation and event initalization.
			 */
			struct arch_hw_breakpoint	info;
			struct list_head		bp_list;
		};
#endif
	};
	/*
	 * If the event is a per task event, this will point to the task in
	 * question. See the comment in perf_event_alloc().
	 */
	struct task_struct		*target;

	/*
	 * PMU would store hardware filter configuration
	 * here.
	 */
	void				*addr_filters;

	/* Last sync'ed generation of filters */
	unsigned long			addr_filters_gen;

/*
 * hw_perf_event::state flags; used to track the PERF_EF_* state.
 */
#define PERF_HES_STOPPED	0x01 /* the counter is stopped */
#define PERF_HES_UPTODATE	0x02 /* event->count up-to-date */
#define PERF_HES_ARCH		0x04

	int				state;

	/*
	 * The last observed hardware counter value, updated with a
	 * local64_cmpxchg() such that pmu::read() can be called nested.
	 */
	local64_t			prev_count;

	/*
	 * The period to start the next sample with.
	 */
	u64				sample_period;

	/*
	 * The period we started this sample with.
	 */
	u64				last_period