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#ifndef _LINUX_KERNEL_TRACE_H
#define _LINUX_KERNEL_TRACE_H
#include <linux/fs.h>
#include <asm/atomic.h>
#include <linux/sched.h>
#include <linux/clocksource.h>
/*
* Function trace entry - function address and parent function addres:
*/
struct ftrace_entry {
unsigned long ip;
unsigned long parent_ip;
};
/*
* Context switch trace entry - which task (and prio) we switched from/to:
*/
struct ctx_switch_entry {
unsigned int prev_pid;
unsigned char prev_prio;
unsigned char prev_state;
unsigned int next_pid;
unsigned char next_prio;
};
/*
* The trace entry - the most basic unit of tracing. This is what
* is printed in the end as a single line in the trace output, such as:
*
* bash-15816 [01] 235.197585: idle_cpu <- irq_enter
*/
struct trace_entry {
char type;
char cpu;
char flags;
char preempt_count;
int pid;
cycle_t t;
unsigned long idx;
union {
struct ftrace_entry fn;
struct ctx_switch_entry ctx;
};
};
#define TRACE_ENTRY_SIZE sizeof(struct trace_entry)
/*
* The CPU trace array - it consists of thousands of trace entries
* plus some other descriptor data: (for example which task started
* the trace, etc.)
*/
struct trace_array_cpu {
void *trace;
void *trace_current;
unsigned trace_current_idx;
struct list_head trace_pages;
unsigned long trace_idx;
atomic_t disabled;
unsigned long saved_latency;
unsigned long critical_start;
unsigned long critical_end;
unsigned long critical_sequence;
unsigned long nice;
unsigned long policy;
unsigned long rt_priority;
cycle_t preempt_timestamp;
pid_t pid;
uid_t uid;
char comm[TASK_COMM_LEN];
};
struct trace_iterator;
/*
* The trace array - an array of per-CPU trace arrays. This is the
* highest level data structure that individual tracers deal with.
* They have on/off state as well:
*/
struct trace_array {
unsigned long entries;
long ctrl;
int cpu;
cycle_t time_start;
struct trace_array_cpu *data[NR_CPUS];
};
/*
* A specific tracer, represented by methods that operate on a trace array:
*/
struct tracer {
const char *name;
void (*init)(struct trace_array *tr);
void (*reset)(struct trace_array *tr);
void (*open)(struct trace_iterator *iter);
void (*close)(struct trace_iterator *iter);
void (*start)(struct trace_iterator *iter);
void (*stop)(struct trace_iterator *iter);
void (*ctrl_update)(struct trace_array *tr);
struct tracer *next;
int print_max;
};
/*
* Trace iterator - used by printout routines who present trace
* results to users and which routines might sleep, etc:
*/
struct trace_iterator {
struct trace_array *tr;
struct tracer *trace;
struct trace_entry *ent;
unsigned long iter_flags;
loff_t pos;
unsigned long next_idx[NR_CPUS];
struct list_head *next_page[NR_CPUS];
unsigned next_page_idx[NR_CPUS];
long idx;
int cpu;
};
void notrace tracing_reset(struct trace_array_cpu *data);
int tracing_open_generic(struct inode *inode, struct file *filp);
struct dentry *tracing_init_dentry(void);
void ftrace(struct trace_array *tr,
struct trace_array_cpu *data,
unsigned long ip,
unsigned long parent_ip,
unsigned long flags);
void tracing_sched_switch_trace(struct trace_array *tr,
struct trace_array_cpu *data,
struct task_struct *prev,
struct task_struct *next,
unsigned long flags);
void tracing_record_cmdline(struct task_struct *tsk);
void tracing_start_function_trace(void);
void tracing_stop_function_trace(void);
int register_tracer(struct tracer *type);
void unregister_tracer(struct tracer *type);
extern unsigned long nsecs_to_usecs(unsigned long nsecs);
extern unsigned long tracing_max_latency;
extern unsigned long tracing_thresh;
void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
void update_max_tr_single(struct trace_array *tr,
struct task_struct *tsk, int cpu);
static inline notrace cycle_t now(int cpu)
{
return cpu_clock(cpu);
}
#ifdef CONFIG_SCHED_TRACER
extern void notrace
wakeup_sched_switch(struct task_struct *prev, struct task_struct *next);
#else
static inline void
wakeup_sched_switch(struct task_struct *prev, struct task_struct *next)
{
}
#endif
#ifdef CONFIG_CONTEXT_SWITCH_TRACER
typedef void
(*tracer_switch_func_t)(void *private,
struct task_struct *prev,
struct task_struct *next);
struct tracer_switch_ops {
tracer_switch_func_t func;
void *private;
struct tracer_switch_ops *next;
};
extern int register_tracer_switch(struct tracer_switch_ops *ops);
extern int unregister_tracer_switch(struct tracer_switch_ops *ops);
#endif /* CONFIG_CONTEXT_SWITCH_TRACER */
#ifdef CONFIG_DYNAMIC_FTRACE
extern unsigned long ftrace_update_tot_cnt;
#endif
#endif /* _LINUX_KERNEL_TRACE_H */
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