1/**
2 * @file cpu_buffer.h
3 *
4 * @remark Copyright 2002 OProfile authors
5 * @remark Read the file COPYING
6 *
7 * @author John Levon <levon@movementarian.org>
8 */
9
10#ifndef OPROFILE_CPU_BUFFER_H
11#define OPROFILE_CPU_BUFFER_H
12
13#include <linux/types.h>
14#include <linux/spinlock.h>
15#include <linux/workqueue.h>
16#include <linux/cache.h>
17
18struct task_struct;
19
20int alloc_cpu_buffers(void);
21void free_cpu_buffers(void);
22
23void start_cpu_work(void);
24void end_cpu_work(void);
25
26/* CPU buffer is composed of such entries (which are
27 * also used for context switch notes)
28 */
29struct op_sample {
30	unsigned long eip;
31	unsigned long event;
32};
33
34struct oprofile_cpu_buffer {
35	volatile unsigned long head_pos;
36	volatile unsigned long tail_pos;
37	unsigned long buffer_size;
38	struct task_struct * last_task;
39	int last_is_kernel;
40	int tracing;
41	struct op_sample * buffer;
42	unsigned long sample_received;
43	unsigned long sample_lost_overflow;
44	unsigned long backtrace_aborted;
45	int cpu;
46	struct delayed_work work;
47} ____cacheline_aligned;
48
49extern struct oprofile_cpu_buffer cpu_buffer[];
50
51void cpu_buffer_reset(struct oprofile_cpu_buffer * cpu_buf);
52
53/* transient events for the CPU buffer -> event buffer */
54#define CPU_IS_KERNEL 1
55#define CPU_TRACE_BEGIN 2
56
57#endif /* OPROFILE_CPU_BUFFER_H */
58