[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>
#include <linux/ring_buffer.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 op_entry {
	struct ring_buffer_event *event;
	struct op_sample *sample;
	unsigned long irq_flags;
};

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;
	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);

/*
 * Resets the cpu buffer to a sane state.
 *
 * reset these to invalid values; the next sample collected will
 * populate the buffer with proper values to initialize the buffer
 */
static inline void op_cpu_buffer_reset(int cpu)
{
	struct oprofile_cpu_buffer *cpu_buf = &per_cpu(cpu_buffer, cpu);

	cpu_buf->last_is_kernel = -1;
	cpu_buf->last_task = NULL;
}

int op_cpu_buffer_write_entry(struct op_entry *entry);
int op_cpu_buffer_write_commit(struct op_entry *entry);
struct op_sample *op_cpu_buffer_read_entry(int cpu);
unsigned long op_cpu_buffer_entries(int cpu);

/* 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>
6dad828b	18	#include <linux/ring_buffer.h>
6a18037d	19
1da177e4	20	struct task_struct;
6a18037d	21
1da177e4 LT	22	int alloc_cpu_buffers(void);
	23	void free_cpu_buffers(void);
	24
	25	void start_cpu_work(void);
	26	void end_cpu_work(void);
	27
	28	/* CPU buffer is composed of such entries (which are
	29	* also used for context switch notes)
	30	*/
	31	struct op_sample {
	32	unsigned long eip;
	33	unsigned long event;
	34	};
6a18037d	35
6dad828b RR	36	struct op_entry {
	37	struct ring_buffer_event *event;
	38	struct op_sample *sample;
	39	unsigned long irq_flags;
	40	};
	41
1da177e4 LT	42	struct oprofile_cpu_buffer {
	43	volatile unsigned long head_pos;
	44	volatile unsigned long tail_pos;
	45	unsigned long buffer_size;
25ad2913	46	struct task_struct *last_task;
1da177e4 LT	47	int last_is_kernel;
1da177e4 LT	48	int tracing;
1da177e4 LT	49	unsigned long sample_received;
	50	unsigned long sample_lost_overflow;
	51	unsigned long backtrace_aborted;
df9d177a	52	unsigned long sample_invalid_eip;
1da177e4	53	int cpu;
c4028958	54	struct delayed_work work;
8b8b4988	55	};
1da177e4	56
608dfddd	57	DECLARE_PER_CPU(struct oprofile_cpu_buffer, cpu_buffer);
1da177e4	58
fbc9bf9f RR	59	/*
	60	* Resets the cpu buffer to a sane state.
	61	*
	62	* reset these to invalid values; the next sample collected will
	63	* populate the buffer with proper values to initialize the buffer
	64	*/
6d2c53f3	65	static inline void op_cpu_buffer_reset(int cpu)
fbc9bf9f RR	66	{
	67	struct oprofile_cpu_buffer *cpu_buf = &per_cpu(cpu_buffer, cpu);
	68
	69	cpu_buf->last_is_kernel = -1;
	70	cpu_buf->last_task = NULL;
	71	}
1da177e4	72
9966718d RR	73	int op_cpu_buffer_write_entry(struct op_entry *entry);
	74	int op_cpu_buffer_write_commit(struct op_entry *entry);
	75	struct op_sample *op_cpu_buffer_read_entry(int cpu);
	76	unsigned long op_cpu_buffer_entries(int cpu);
bf589e32	77
1da177e4 LT	78	/* transient events for the CPU buffer -> event buffer */
	79	#define CPU_IS_KERNEL 1
	80	#define CPU_TRACE_BEGIN 2
345c2573 BK	81	#define IBS_FETCH_BEGIN 3
345c2573 BK	82	#define IBS_OP_BEGIN 4
1da177e4 LT	83
1da177e4 LT	84	#endif /* OPROFILE_CPU_BUFFER_H */