[deliverable/linux.git] / drivers / oprofile / cpu_buffer.h

/**
 * @file cpu_buffer.h
 *
 * @remark Copyright 2002 OProfile authors
 * @remark Read the file COPYING
 *
 * @author John Levon <levon@movementarian.org>
 */

#ifndef OPROFILE_CPU_BUFFER_H
#define OPROFILE_CPU_BUFFER_H

#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
#include <linux/cache.h>
#include <linux/sched.h>

struct task_struct;

int alloc_cpu_buffers(void);
void free_cpu_buffers(void);

void start_cpu_work(void);
void end_cpu_work(void);

/* CPU buffer is composed of such entries (which are
 * also used for context switch notes)
 */
struct op_sample {
	unsigned long eip;
	unsigned long event;
};

struct oprofile_cpu_buffer {
	volatile unsigned long head_pos;
	volatile unsigned long tail_pos;
	unsigned long buffer_size;
	struct task_struct *last_task;
	int last_is_kernel;
	int tracing;
	struct op_sample *buffer;
	unsigned long sample_received;
	unsigned long sample_lost_overflow;
	unsigned long backtrace_aborted;
	unsigned long sample_invalid_eip;
	int cpu;
	struct delayed_work work;
};

DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);

void cpu_buffer_reset(struct oprofile_cpu_buffer *cpu_buf);

static inline
struct op_sample *cpu_buffer_write_entry(struct oprofile_cpu_buffer *cpu_buf)
{
	return &cpu_buf->buffer[cpu_buf->head_pos];
}

static inline
struct op_sample *cpu_buffer_read_entry(struct oprofile_cpu_buffer *cpu_buf)
{
	return &cpu_buf->buffer[cpu_buf->tail_pos];
}

/* transient events for the CPU buffer -> event buffer */
#define CPU_IS_KERNEL 1
#define CPU_TRACE_BEGIN 2
#define IBS_FETCH_BEGIN 3
#define IBS_OP_BEGIN    4

#endif /* OPROFILE_CPU_BUFFER_H */
Commit	Line	Data
1da177e4 LT	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>
608dfddd	17	#include <linux/sched.h>
6a18037d	18
1da177e4	19	struct task_struct;
6a18037d	20
1da177e4 LT	21	int alloc_cpu_buffers(void);
	22	void free_cpu_buffers(void);
	23
	24	void start_cpu_work(void);
	25	void end_cpu_work(void);
	26
	27	/* CPU buffer is composed of such entries (which are
	28	* also used for context switch notes)
	29	*/
	30	struct op_sample {
	31	unsigned long eip;
	32	unsigned long event;
	33	};
6a18037d	34
1da177e4 LT	35	struct oprofile_cpu_buffer {
	36	volatile unsigned long head_pos;
	37	volatile unsigned long tail_pos;
	38	unsigned long buffer_size;
25ad2913	39	struct task_struct *last_task;
1da177e4 LT	40	int last_is_kernel;
1da177e4 LT	41	int tracing;
25ad2913	42	struct op_sample *buffer;
1da177e4 LT	43	unsigned long sample_received;
	44	unsigned long sample_lost_overflow;
	45	unsigned long backtrace_aborted;
df9d177a	46	unsigned long sample_invalid_eip;
1da177e4	47	int cpu;
c4028958	48	struct delayed_work work;
8b8b4988	49	};
1da177e4	50
608dfddd	51	DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
1da177e4	52
25ad2913	53	void cpu_buffer_reset(struct oprofile_cpu_buffer *cpu_buf);
1da177e4	54
7d468abe RR	55	static inline
	56	struct op_sample cpu_buffer_write_entry(struct oprofile_cpu_buffer cpu_buf)
	57	{
	58	return &cpu_buf->buffer[cpu_buf->head_pos];
	59	}
	60
	61	static inline
	62	struct op_sample cpu_buffer_read_entry(struct oprofile_cpu_buffer cpu_buf)
	63	{
	64	return &cpu_buf->buffer[cpu_buf->tail_pos];
	65	}
	66
1da177e4 LT	67	/* transient events for the CPU buffer -> event buffer */
	68	#define CPU_IS_KERNEL 1
	69	#define CPU_TRACE_BEGIN 2
345c2573 BK	70	#define IBS_FETCH_BEGIN 3
345c2573 BK	71	#define IBS_OP_BEGIN 4
1da177e4 LT	72
1da177e4 LT	73	#endif /* OPROFILE_CPU_BUFFER_H */