210 lines
6.1 KiB
C
210 lines
6.1 KiB
C
/**
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* @file oprofile.h
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*
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* API for machine-specific interrupts to interface
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* to oprofile.
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*
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* @remark Copyright 2002 OProfile authors
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* @remark Read the file COPYING
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*
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* @author John Levon <levon@movementarian.org>
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*/
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#ifndef OPROFILE_H
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#define OPROFILE_H
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#include <linux/types.h>
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#include <linux/spinlock.h>
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#include <linux/init.h>
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#include <linux/errno.h>
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#include <linux/printk.h>
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#include <linux/atomic.h>
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/* Each escaped entry is prefixed by ESCAPE_CODE
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* then one of the following codes, then the
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* relevant data.
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* These #defines live in this file so that arch-specific
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* buffer sync'ing code can access them.
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*/
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#define ESCAPE_CODE ~0UL
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#define CTX_SWITCH_CODE 1
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#define CPU_SWITCH_CODE 2
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#define COOKIE_SWITCH_CODE 3
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#define KERNEL_ENTER_SWITCH_CODE 4
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#define KERNEL_EXIT_SWITCH_CODE 5
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#define MODULE_LOADED_CODE 6
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#define CTX_TGID_CODE 7
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#define TRACE_BEGIN_CODE 8
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#define TRACE_END_CODE 9
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#define XEN_ENTER_SWITCH_CODE 10
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#define SPU_PROFILING_CODE 11
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#define SPU_CTX_SWITCH_CODE 12
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#define IBS_FETCH_CODE 13
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#define IBS_OP_CODE 14
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struct dentry;
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struct file_operations;
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struct pt_regs;
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/* Operations structure to be filled in */
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struct oprofile_operations {
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/* create any necessary configuration files in the oprofile fs.
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* Optional. */
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int (*create_files)(struct dentry * root);
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/* Do any necessary interrupt setup. Optional. */
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int (*setup)(void);
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/* Do any necessary interrupt shutdown. Optional. */
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void (*shutdown)(void);
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/* Start delivering interrupts. */
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int (*start)(void);
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/* Stop delivering interrupts. */
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void (*stop)(void);
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/* Arch-specific buffer sync functions.
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* Return value = 0: Success
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* Return value = -1: Failure
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* Return value = 1: Run generic sync function
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*/
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int (*sync_start)(void);
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int (*sync_stop)(void);
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/* Initiate a stack backtrace. Optional. */
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void (*backtrace)(struct pt_regs * const regs, unsigned int depth);
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/* Multiplex between different events. Optional. */
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int (*switch_events)(void);
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/* CPU identification string. */
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char * cpu_type;
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};
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/**
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* One-time initialisation. *ops must be set to a filled-in
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* operations structure. This is called even in timer interrupt
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* mode so an arch can set a backtrace callback.
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*
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* If an error occurs, the fields should be left untouched.
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*/
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int oprofile_arch_init(struct oprofile_operations * ops);
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/**
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* One-time exit/cleanup for the arch.
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*/
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void oprofile_arch_exit(void);
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/**
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* Add a sample. This may be called from any context.
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*/
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void oprofile_add_sample(struct pt_regs * const regs, unsigned long event);
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/**
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* Add an extended sample. Use this when the PC is not from the regs, and
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* we cannot determine if we're in kernel mode from the regs.
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*
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* This function does perform a backtrace.
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*
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*/
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void oprofile_add_ext_sample(unsigned long pc, struct pt_regs * const regs,
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unsigned long event, int is_kernel);
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/**
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* Add an hardware sample.
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*/
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void oprofile_add_ext_hw_sample(unsigned long pc, struct pt_regs * const regs,
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unsigned long event, int is_kernel,
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struct task_struct *task);
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/* Use this instead when the PC value is not from the regs. Doesn't
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* backtrace. */
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void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event);
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/* add a backtrace entry, to be called from the ->backtrace callback */
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void oprofile_add_trace(unsigned long eip);
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/**
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* Create a file of the given name as a child of the given root, with
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* the specified file operations.
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*/
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int oprofilefs_create_file(struct dentry * root,
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char const * name, const struct file_operations * fops);
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int oprofilefs_create_file_perm(struct dentry * root,
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char const * name, const struct file_operations * fops, int perm);
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/** Create a file for read/write access to an unsigned long. */
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int oprofilefs_create_ulong(struct dentry * root,
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char const * name, ulong * val);
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/** Create a file for read-only access to an unsigned long. */
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int oprofilefs_create_ro_ulong(struct dentry * root,
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char const * name, ulong * val);
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/** Create a file for read-only access to an atomic_t. */
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int oprofilefs_create_ro_atomic(struct dentry * root,
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char const * name, atomic_t * val);
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/** create a directory */
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struct dentry *oprofilefs_mkdir(struct dentry *parent, char const *name);
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/**
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* Write the given asciz string to the given user buffer @buf, updating *offset
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* appropriately. Returns bytes written or -EFAULT.
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*/
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ssize_t oprofilefs_str_to_user(char const * str, char __user * buf, size_t count, loff_t * offset);
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/**
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* Convert an unsigned long value into ASCII and copy it to the user buffer @buf,
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* updating *offset appropriately. Returns bytes written or -EFAULT.
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*/
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ssize_t oprofilefs_ulong_to_user(unsigned long val, char __user * buf, size_t count, loff_t * offset);
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/**
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* Read an ASCII string for a number from a userspace buffer and fill *val on success.
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* Returns 0 on success, < 0 on error.
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*/
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int oprofilefs_ulong_from_user(unsigned long * val, char const __user * buf, size_t count);
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/** lock for read/write safety */
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extern raw_spinlock_t oprofilefs_lock;
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/**
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* Add the contents of a circular buffer to the event buffer.
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*/
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void oprofile_put_buff(unsigned long *buf, unsigned int start,
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unsigned int stop, unsigned int max);
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unsigned long oprofile_get_cpu_buffer_size(void);
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void oprofile_cpu_buffer_inc_smpl_lost(void);
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/* cpu buffer functions */
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struct op_sample;
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struct op_entry {
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struct ring_buffer_event *event;
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struct op_sample *sample;
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unsigned long size;
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unsigned long *data;
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};
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void oprofile_write_reserve(struct op_entry *entry,
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struct pt_regs * const regs,
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unsigned long pc, int code, int size);
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int oprofile_add_data(struct op_entry *entry, unsigned long val);
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int oprofile_add_data64(struct op_entry *entry, u64 val);
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int oprofile_write_commit(struct op_entry *entry);
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#ifdef CONFIG_HW_PERF_EVENTS
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int __init oprofile_perf_init(struct oprofile_operations *ops);
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void oprofile_perf_exit(void);
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char *op_name_from_perf_id(void);
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#else
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static inline int __init oprofile_perf_init(struct oprofile_operations *ops)
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{
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pr_info("oprofile: hardware counters not available\n");
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return -ENODEV;
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}
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static inline void oprofile_perf_exit(void) { }
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#endif /* CONFIG_HW_PERF_EVENTS */
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#endif /* OPROFILE_H */
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