/**
* @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 <asm/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 super_block;
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 super_block * sb, 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);
/* 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 super_block * sb, struct dentry * root,
char const * name, const struct file_operations * fops);
int oprofilefs_create_file_perm(struct super_block * sb, 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 super_block * sb, 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 super_block * sb, 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 super_block * sb, struct dentry * root,
char const * name, atomic_t * val);
/** create a directory */
struct dentry * oprofilefs_mkdir(struct super_block * sb, struct dentry * root,
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 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 */
