linux/include/linux/oprofile.h
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   1/**
   2 * @file oprofile.h
   3 *
   4 * API for machine-specific interrupts to interface
   5 * to oprofile.
   6 *
   7 * @remark Copyright 2002 OProfile authors
   8 * @remark Read the file COPYING
   9 *
  10 * @author John Levon <levon@movementarian.org>
  11 */
  12
  13#ifndef OPROFILE_H
  14#define OPROFILE_H
  15
  16#include <linux/types.h>
  17#include <linux/spinlock.h>
  18#include <linux/init.h>
  19#include <linux/errno.h>
  20#include <linux/printk.h>
  21#include <linux/atomic.h>
  22 
  23/* Each escaped entry is prefixed by ESCAPE_CODE
  24 * then one of the following codes, then the
  25 * relevant data.
  26 * These #defines live in this file so that arch-specific
  27 * buffer sync'ing code can access them.
  28 */
  29#define ESCAPE_CODE                     ~0UL
  30#define CTX_SWITCH_CODE                 1
  31#define CPU_SWITCH_CODE                 2
  32#define COOKIE_SWITCH_CODE              3
  33#define KERNEL_ENTER_SWITCH_CODE        4
  34#define KERNEL_EXIT_SWITCH_CODE         5
  35#define MODULE_LOADED_CODE              6
  36#define CTX_TGID_CODE                   7
  37#define TRACE_BEGIN_CODE                8
  38#define TRACE_END_CODE                  9
  39#define XEN_ENTER_SWITCH_CODE           10
  40#define SPU_PROFILING_CODE              11
  41#define SPU_CTX_SWITCH_CODE             12
  42#define IBS_FETCH_CODE                  13
  43#define IBS_OP_CODE                     14
  44
  45struct super_block;
  46struct dentry;
  47struct file_operations;
  48struct pt_regs;
  49 
  50/* Operations structure to be filled in */
  51struct oprofile_operations {
  52        /* create any necessary configuration files in the oprofile fs.
  53         * Optional. */
  54        int (*create_files)(struct super_block * sb, struct dentry * root);
  55        /* Do any necessary interrupt setup. Optional. */
  56        int (*setup)(void);
  57        /* Do any necessary interrupt shutdown. Optional. */
  58        void (*shutdown)(void);
  59        /* Start delivering interrupts. */
  60        int (*start)(void);
  61        /* Stop delivering interrupts. */
  62        void (*stop)(void);
  63        /* Arch-specific buffer sync functions.
  64         * Return value = 0:  Success
  65         * Return value = -1: Failure
  66         * Return value = 1:  Run generic sync function
  67         */
  68        int (*sync_start)(void);
  69        int (*sync_stop)(void);
  70
  71        /* Initiate a stack backtrace. Optional. */
  72        void (*backtrace)(struct pt_regs * const regs, unsigned int depth);
  73
  74        /* Multiplex between different events. Optional. */
  75        int (*switch_events)(void);
  76        /* CPU identification string. */
  77        char * cpu_type;
  78};
  79
  80/**
  81 * One-time initialisation. *ops must be set to a filled-in
  82 * operations structure. This is called even in timer interrupt
  83 * mode so an arch can set a backtrace callback.
  84 *
  85 * If an error occurs, the fields should be left untouched.
  86 */
  87int oprofile_arch_init(struct oprofile_operations * ops);
  88 
  89/**
  90 * One-time exit/cleanup for the arch.
  91 */
  92void oprofile_arch_exit(void);
  93
  94/**
  95 * Add a sample. This may be called from any context.
  96 */
  97void oprofile_add_sample(struct pt_regs * const regs, unsigned long event);
  98
  99/**
 100 * Add an extended sample.  Use this when the PC is not from the regs, and
 101 * we cannot determine if we're in kernel mode from the regs.
 102 *
 103 * This function does perform a backtrace.
 104 *
 105 */
 106void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
 107                                unsigned long event, int is_kernel);
 108
 109/**
 110 * Add an hardware sample.
 111 */
 112void oprofile_add_ext_hw_sample(unsigned long pc, struct pt_regs * const regs,
 113        unsigned long event, int is_kernel,
 114        struct task_struct *task);
 115
 116/* Use this instead when the PC value is not from the regs. Doesn't
 117 * backtrace. */
 118void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event);
 119
 120/* add a backtrace entry, to be called from the ->backtrace callback */
 121void oprofile_add_trace(unsigned long eip);
 122
 123
 124/**
 125 * Create a file of the given name as a child of the given root, with
 126 * the specified file operations.
 127 */
 128int oprofilefs_create_file(struct super_block * sb, struct dentry * root,
 129        char const * name, const struct file_operations * fops);
 130
 131int oprofilefs_create_file_perm(struct super_block * sb, struct dentry * root,
 132        char const * name, const struct file_operations * fops, int perm);
 133 
 134/** Create a file for read/write access to an unsigned long. */
 135int oprofilefs_create_ulong(struct super_block * sb, struct dentry * root,
 136        char const * name, ulong * val);
 137 
 138/** Create a file for read-only access to an unsigned long. */
 139int oprofilefs_create_ro_ulong(struct super_block * sb, struct dentry * root,
 140        char const * name, ulong * val);
 141 
 142/** Create a file for read-only access to an atomic_t. */
 143int oprofilefs_create_ro_atomic(struct super_block * sb, struct dentry * root,
 144        char const * name, atomic_t * val);
 145 
 146/** create a directory */
 147struct dentry * oprofilefs_mkdir(struct super_block * sb, struct dentry * root,
 148        char const * name);
 149
 150/**
 151 * Write the given asciz string to the given user buffer @buf, updating *offset
 152 * appropriately. Returns bytes written or -EFAULT.
 153 */
 154ssize_t oprofilefs_str_to_user(char const * str, char __user * buf, size_t count, loff_t * offset);
 155
 156/**
 157 * Convert an unsigned long value into ASCII and copy it to the user buffer @buf,
 158 * updating *offset appropriately. Returns bytes written or -EFAULT.
 159 */
 160ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user * buf, size_t count, loff_t * offset);
 161
 162/**
 163 * Read an ASCII string for a number from a userspace buffer and fill *val on success.
 164 * Returns 0 on success, < 0 on error.
 165 */
 166int oprofilefs_ulong_from_user(unsigned long * val, char const __user * buf, size_t count);
 167
 168/** lock for read/write safety */
 169extern raw_spinlock_t oprofilefs_lock;
 170
 171/**
 172 * Add the contents of a circular buffer to the event buffer.
 173 */
 174void oprofile_put_buff(unsigned long *buf, unsigned int start,
 175                        unsigned int stop, unsigned int max);
 176
 177unsigned long oprofile_get_cpu_buffer_size(void);
 178void oprofile_cpu_buffer_inc_smpl_lost(void);
 179 
 180/* cpu buffer functions */
 181
 182struct op_sample;
 183
 184struct op_entry {
 185        struct ring_buffer_event *event;
 186        struct op_sample *sample;
 187        unsigned long size;
 188        unsigned long *data;
 189};
 190
 191void oprofile_write_reserve(struct op_entry *entry,
 192                            struct pt_regs * const regs,
 193                            unsigned long pc, int code, int size);
 194int oprofile_add_data(struct op_entry *entry, unsigned long val);
 195int oprofile_add_data64(struct op_entry *entry, u64 val);
 196int oprofile_write_commit(struct op_entry *entry);
 197
 198#ifdef CONFIG_HW_PERF_EVENTS
 199int __init oprofile_perf_init(struct oprofile_operations *ops);
 200void oprofile_perf_exit(void);
 201char *op_name_from_perf_id(void);
 202#else
 203static inline int __init oprofile_perf_init(struct oprofile_operations *ops)
 204{
 205        pr_info("oprofile: hardware counters not available\n");
 206        return -ENODEV;
 207}
 208static inline void oprofile_perf_exit(void) { }
 209#endif /* CONFIG_HW_PERF_EVENTS */
 210
 211#endif /* OPROFILE_H */
 212
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