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Current File : /proc/self/root/usr/src/linux-headers-5.4.0-182-generic/include/linux/oprofile.h
/**
 * @file oprofile.h
 *
 * API for machine-specific interrupts to interface
 * to oprofile.
 *
 * @remark Copyright 2002 OProfile authors
 * @remark Read the file COPYING
 *
 * @author John Levon <levon@movementarian.org>
 */

#ifndef OPROFILE_H
#define OPROFILE_H

#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/printk.h>
#include <linux/atomic.h>
 
/* Each escaped entry is prefixed by ESCAPE_CODE
 * then one of the following codes, then the
 * relevant data.
 * These #defines live in this file so that arch-specific
 * buffer sync'ing code can access them.
 */
#define ESCAPE_CODE			~0UL
#define CTX_SWITCH_CODE			1
#define CPU_SWITCH_CODE			2
#define COOKIE_SWITCH_CODE		3
#define KERNEL_ENTER_SWITCH_CODE	4
#define KERNEL_EXIT_SWITCH_CODE		5
#define MODULE_LOADED_CODE		6
#define CTX_TGID_CODE			7
#define TRACE_BEGIN_CODE		8
#define TRACE_END_CODE			9
#define XEN_ENTER_SWITCH_CODE		10
#define SPU_PROFILING_CODE		11
#define SPU_CTX_SWITCH_CODE		12
#define IBS_FETCH_CODE			13
#define IBS_OP_CODE			14

struct dentry;
struct file_operations;
struct pt_regs;
 
/* Operations structure to be filled in */
struct oprofile_operations {
	/* create any necessary configuration files in the oprofile fs.
	 * Optional. */
	int (*create_files)(struct dentry * root);
	/* Do any necessary interrupt setup. Optional. */
	int (*setup)(void);
	/* Do any necessary interrupt shutdown. Optional. */
	void (*shutdown)(void);
	/* Start delivering interrupts. */
	int (*start)(void);
	/* Stop delivering interrupts. */
	void (*stop)(void);
	/* Arch-specific buffer sync functions.
	 * Return value = 0:  Success
	 * Return value = -1: Failure
	 * Return value = 1:  Run generic sync function
	 */
	int (*sync_start)(void);
	int (*sync_stop)(void);

	/* Initiate a stack backtrace. Optional. */
	void (*backtrace)(struct pt_regs * const regs, unsigned int depth);

	/* Multiplex between different events. Optional. */
	int (*switch_events)(void);
	/* CPU identification string. */
	char * cpu_type;
};

/**
 * One-time initialisation. *ops must be set to a filled-in
 * operations structure. This is called even in timer interrupt
 * mode so an arch can set a backtrace callback.
 *
 * If an error occurs, the fields should be left untouched.
 */
int oprofile_arch_init(struct oprofile_operations * ops);
 
/**
 * One-time exit/cleanup for the arch.
 */
void oprofile_arch_exit(void);

/**
 * Add a sample. This may be called from any context.
 */
void oprofile_add_sample(struct pt_regs * const regs, unsigned long event);

/**
 * Add an extended sample.  Use this when the PC is not from the regs, and
 * we cannot determine if we're in kernel mode from the regs.
 *
 * This function does perform a backtrace.
 *
 */
void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
				unsigned long event, int is_kernel);

/**
 * Add an hardware sample.
 */
void oprofile_add_ext_hw_sample(unsigned long pc, struct pt_regs * const regs,
	unsigned long event, int is_kernel,
	struct task_struct *task);

/* Use this instead when the PC value is not from the regs. Doesn't
 * backtrace. */
void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event);

/* add a backtrace entry, to be called from the ->backtrace callback */
void oprofile_add_trace(unsigned long eip);


/**
 * Create a file of the given name as a child of the given root, with
 * the specified file operations.
 */
int oprofilefs_create_file(struct dentry * root,
	char const * name, const struct file_operations * fops);

int oprofilefs_create_file_perm(struct dentry * root,
	char const * name, const struct file_operations * fops, int perm);
 
/** Create a file for read/write access to an unsigned long. */
int oprofilefs_create_ulong(struct dentry * root,
	char const * name, ulong * val);
 
/** Create a file for read-only access to an unsigned long. */
int oprofilefs_create_ro_ulong(struct dentry * root,
	char const * name, ulong * val);
 
/** Create a file for read-only access to an atomic_t. */
int oprofilefs_create_ro_atomic(struct dentry * root,
	char const * name, atomic_t * val);
 
/** create a directory */
struct dentry *oprofilefs_mkdir(struct dentry *parent, char const *name);

/**
 * Write the given asciz string to the given user buffer @buf, updating *offset
 * appropriately. Returns bytes written or -EFAULT.
 */
ssize_t oprofilefs_str_to_user(char const * str, char __user * buf, size_t count, loff_t * offset);

/**
 * Convert an unsigned long value into ASCII and copy it to the user buffer @buf,
 * updating *offset appropriately. Returns bytes written or -EFAULT.
 */
ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user * buf, size_t count, loff_t * offset);

/**
 * Read an ASCII string for a number from a userspace buffer and fill *val on success.
 * Returns 0 on success, < 0 on error.
 */
int oprofilefs_ulong_from_user(unsigned long * val, char const __user * buf, size_t count);

/** lock for read/write safety */
extern raw_spinlock_t oprofilefs_lock;

/**
 * Add the contents of a circular buffer to the event buffer.
 */
void oprofile_put_buff(unsigned long *buf, unsigned int start,
			unsigned int stop, unsigned int max);

unsigned long oprofile_get_cpu_buffer_size(void);
void oprofile_cpu_buffer_inc_smpl_lost(void);
 
/* cpu buffer functions */

struct op_sample;

struct op_entry {
	struct ring_buffer_event *event;
	struct op_sample *sample;
	unsigned long size;
	unsigned long *data;
};

void oprofile_write_reserve(struct op_entry *entry,
			    struct pt_regs * const regs,
			    unsigned long pc, int code, int size);
int oprofile_add_data(struct op_entry *entry, unsigned long val);
int oprofile_add_data64(struct op_entry *entry, u64 val);
int oprofile_write_commit(struct op_entry *entry);

#ifdef CONFIG_HW_PERF_EVENTS
int __init oprofile_perf_init(struct oprofile_operations *ops);
void oprofile_perf_exit(void);
char *op_name_from_perf_id(void);
#else
static inline int __init oprofile_perf_init(struct oprofile_operations *ops)
{
	pr_info("oprofile: hardware counters not available\n");
	return -ENODEV;
}
static inline void oprofile_perf_exit(void) { }
#endif /* CONFIG_HW_PERF_EVENTS */

#endif /* OPROFILE_H */

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