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