kern/include/oprofile.h

/**
 * @file oprofile.h
 *
 * API for machine-specific interrupts to interface
 * to oprofile.
 *
 * @remark Copyright 2002 OProfile authors
 * @remark Read the file COPYING
 *
 * @author John Levon <levon@movementarian.org>
 */

#ifndef OPROFILE_H
#define OPROFILE_H

/* Each escaped entry is prefixed by ESCAPE_CODE
 * then one of the following codes, then the
 * relevant data.
 * These #defines live in this file so that arch-specific
 * buffer sync'ing code can access them.
 */
#define ESCAPE_CODE			~0UL
#define CTX_SWITCH_CODE			1
#define CPU_SWITCH_CODE			2
#define COOKIE_SWITCH_CODE		3
#define KERNEL_ENTER_SWITCH_CODE	4
#define KERNEL_EXIT_SWITCH_CODE		5
#define MODULE_LOADED_CODE		6
#define CTX_TGID_CODE			7
#define TRACE_BEGIN_CODE		8
#define TRACE_END_CODE			9
#define XEN_ENTER_SWITCH_CODE		10
#define SPU_PROFILING_CODE		11
#define SPU_CTX_SWITCH_CODE		12
#define IBS_FETCH_CODE			13
#define IBS_OP_CODE			14

 
/* Operations structure to be filled in */
struct oprofile_operations {
	/* create any necessary configuration files in the oprofile fs.
	 * Optional. */
	int (*create_files)(void* sb, void *root);
	/* Do any necessary interrupt setup. Optional. */
	int (*setup)(void);
	/* Do any necessary interrupt shutdown. Optional. */
	void (*shutdown)(void);
	/* Start delivering interrupts. */
	int (*start)(void);
	/* Stop delivering interrupts. */
	void (*stop)(void);
	/* Arch-specific buffer sync functions.
	 * Return value = 0:  Success
	 * Return value = -1: Failure
	 * Return value = 1:  Run generic sync function
	 */
	int (*sync_start)(void);
	int (*sync_stop)(void);

	/* Initiate a stack backtrace. Optional. */
	void (*backtrace)(void * const regs, unsigned int depth);

	/* Multiplex between different events. Optional. */
	int (*switch_events)(void);
	/* CPU identification string. */
	char * cpu_type;
};

/**
 * One-time initialisation. *ops must be set to a filled-in
 * operations structure. This is called even in timer interrupt
 * mode so an arch can set a backtrace callback.
 *
 * If an error occurs, the fields should be left untouched.
 */
int oprofile_arch_init(struct oprofile_operations * ops);
 
/**
 * One-time exit/cleanup for the arch.
 */
void oprofile_arch_exit(void);

/**
 * Add a sample. This may be called from any context.
 */
void oprofile_add_sample(void* const regs, unsigned long event);

/**
 * Add an extended sample.  Use this when the PC is not from the regs, and
 * we cannot determine if we're in kernel mode from the regs.
 *
 * This function does perform a backtrace.
 *
 */
void oprofile_add_ext_sample(unsigned long pc, void * const regs,
				unsigned long event, int is_kernel);

/* circular include stuff... */
struct proc;
/**
 * Add an hardware sample.
 */
void oprofile_add_ext_hw_sample(unsigned long pc, /*struct pt_regs*/void * const regs,
				unsigned long event, int is_kernel,
				struct proc *proc);

/* Use this instead when the PC value is not from the regs. Doesn't
 * backtrace. */
void oprofile_add_pc(unsigned long pc, int is_kernel, unsigned long event);

void oprofile_add_backtrace(uintptr_t pc, uintptr_t fp);
void oprofile_add_userpc(uintptr_t pc);

/* add a backtrace entry, to be called from the ->backtrace callback */
void oprofile_add_trace(unsigned long eip);


/**
 * Add the contents of a circular buffer to the event buffer.
 */
void oprofile_put_buff(unsigned long *buf, unsigned int start,
			unsigned int stop, unsigned int max);

unsigned long oprofile_get_cpu_buffer_size(void);
void oprofile_cpu_buffer_inc_smpl_lost(void);
 
/* cpu buffer functions */

struct op_sample;

struct op_entry {
	void *event;
	struct op_sample *sample;
	unsigned long size;
	unsigned long *data;
};

void oprofile_write_reserve(struct op_entry *entry,
			    void */*struct pt_regs **/ const regs,
			    unsigned long pc, int code, int size);
int oprofile_add_data(struct op_entry *entry, unsigned long val);
int oprofile_add_data64(struct op_entry *entry, uint64_t val);
int oprofile_write_commit(struct op_entry *entry);

int oprofile_perf_init(struct oprofile_operations *ops);
void oprofile_perf_exit(void);
char *op_name_from_perf_id(void);

struct op_sample *op_cpu_buffer_read_entry(struct op_entry *entry, int cpu);
unsigned long op_cpu_buffer_entries(int cpu);
void oprofile_cpubuf_flushone(int core, int newbuf);
void oprofile_cpubuf_flushall(int alloc);
void oprofile_control_trace(int onoff);
int oprofread(void *,int);
int oproflen(void);

#if 0 
make these weak funcitons. 
static inline int __init oprofile_perf_init(struct oprofile_operations *ops)
{
	pr_info("oprofile: hardware counters not available\n");
	return -ENODEV;
}
static inline void oprofile_perf_exit(void) { }
#endif

#endif /* OPROFILE_H */