#ifndef _LINUX_KERNEL_TRACE_H #define _LINUX_KERNEL_TRACE_H #include #include #include #include /* * 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; }; /* * Special (free-form) trace entry: */ struct special_entry { unsigned long arg1; unsigned long arg2; unsigned long arg3; }; /* * 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; union { struct ftrace_entry fn; struct ctx_switch_entry ctx; struct special_entry special; }; }; #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 { struct list_head trace_pages; atomic_t disabled; spinlock_t lock; struct lock_class_key lock_key; /* these fields get copied into max-trace: */ unsigned trace_head_idx; unsigned trace_tail_idx; void *trace_head; /* producer */ void *trace_tail; /* consumer */ unsigned long trace_idx; 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 task_struct *waiter; 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); #ifdef CONFIG_FTRACE_STARTUP_TEST int (*selftest)(struct tracer *trace, struct trace_array *tr); #endif struct tracer *next; int print_max; }; struct trace_seq { unsigned char buffer[PAGE_SIZE]; unsigned int len; }; /* * Trace iterator - used by printout routines who present trace * results to users and which routines might sleep, etc: */ struct trace_iterator { struct trace_seq seq; struct trace_array *tr; struct tracer *trace; struct trace_entry *ent; int cpu; struct trace_entry *prev_ent; int prev_cpu; 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; }; 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 trace_special(struct trace_array *tr, struct trace_array_cpu *data, unsigned long arg1, unsigned long arg2, unsigned long arg3); void trace_function(struct trace_array *tr, struct trace_array_cpu *data, unsigned long ip, unsigned long parent_ip, unsigned long flags); 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); extern notrace cycle_t ftrace_now(int 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 #ifdef CONFIG_FTRACE_STARTUP_TEST #ifdef CONFIG_FTRACE extern int trace_selftest_startup_function(struct tracer *trace, struct trace_array *tr); #endif #ifdef CONFIG_IRQSOFF_TRACER extern int trace_selftest_startup_irqsoff(struct tracer *trace, struct trace_array *tr); #endif #ifdef CONFIG_PREEMPT_TRACER extern int trace_selftest_startup_preemptoff(struct tracer *trace, struct trace_array *tr); #endif #if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER) extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace, struct trace_array *tr); #endif #ifdef CONFIG_SCHED_TRACER extern int trace_selftest_startup_wakeup(struct tracer *trace, struct trace_array *tr); #endif #ifdef CONFIG_CONTEXT_SWITCH_TRACER extern int trace_selftest_startup_sched_switch(struct tracer *trace, struct trace_array *tr); #endif #endif /* CONFIG_FTRACE_STARTUP_TEST */ extern void *head_page(struct trace_array_cpu *data); #endif /* _LINUX_KERNEL_TRACE_H */