1 #ifndef _LINUX_KERNEL_TRACE_H
2 #define _LINUX_KERNEL_TRACE_H
5 #include <asm/atomic.h>
6 #include <linux/sched.h>
7 #include <linux/clocksource.h>
10 __TRACE_FIRST_TYPE
= 0,
22 * Function trace entry - function address and parent function addres:
26 unsigned long parent_ip
;
30 * Context switch trace entry - which task (and prio) we switched from/to:
32 struct ctx_switch_entry
{
33 unsigned int prev_pid
;
34 unsigned char prev_prio
;
35 unsigned char prev_state
;
36 unsigned int next_pid
;
37 unsigned char next_prio
;
38 unsigned char next_state
;
42 * Special (free-form) trace entry:
44 struct special_entry
{
54 #define FTRACE_STACK_ENTRIES 5
57 unsigned long caller
[FTRACE_STACK_ENTRIES
];
61 * The trace entry - the most basic unit of tracing. This is what
62 * is printed in the end as a single line in the trace output, such as:
64 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
74 struct ftrace_entry fn
;
75 struct ctx_switch_entry ctx
;
76 struct special_entry special
;
77 struct stack_entry stack
;
81 #define TRACE_ENTRY_SIZE sizeof(struct trace_entry)
84 * The CPU trace array - it consists of thousands of trace entries
85 * plus some other descriptor data: (for example which task started
88 struct trace_array_cpu
{
89 struct list_head trace_pages
;
92 struct lock_class_key lock_key
;
94 /* these fields get copied into max-trace: */
95 unsigned trace_head_idx
;
96 unsigned trace_tail_idx
;
97 void *trace_head
; /* producer */
98 void *trace_tail
; /* consumer */
99 unsigned long trace_idx
;
100 unsigned long overrun
;
101 unsigned long saved_latency
;
102 unsigned long critical_start
;
103 unsigned long critical_end
;
104 unsigned long critical_sequence
;
106 unsigned long policy
;
107 unsigned long rt_priority
;
108 cycle_t preempt_timestamp
;
111 char comm
[TASK_COMM_LEN
];
114 struct trace_iterator
;
117 * The trace array - an array of per-CPU trace arrays. This is the
118 * highest level data structure that individual tracers deal with.
119 * They have on/off state as well:
122 unsigned long entries
;
126 struct task_struct
*waiter
;
127 struct trace_array_cpu
*data
[NR_CPUS
];
131 * A specific tracer, represented by methods that operate on a trace array:
135 void (*init
)(struct trace_array
*tr
);
136 void (*reset
)(struct trace_array
*tr
);
137 void (*open
)(struct trace_iterator
*iter
);
138 void (*pipe_open
)(struct trace_iterator
*iter
);
139 void (*close
)(struct trace_iterator
*iter
);
140 void (*start
)(struct trace_iterator
*iter
);
141 void (*stop
)(struct trace_iterator
*iter
);
142 ssize_t (*read
)(struct trace_iterator
*iter
,
143 struct file
*filp
, char __user
*ubuf
,
144 size_t cnt
, loff_t
*ppos
);
145 void (*ctrl_update
)(struct trace_array
*tr
);
146 #ifdef CONFIG_FTRACE_STARTUP_TEST
147 int (*selftest
)(struct tracer
*trace
,
148 struct trace_array
*tr
);
150 int (*print_line
)(struct trace_iterator
*iter
);
156 unsigned char buffer
[PAGE_SIZE
];
161 * Trace iterator - used by printout routines who present trace
162 * results to users and which routines might sleep, etc:
164 struct trace_iterator
{
165 struct trace_array
*tr
;
166 struct tracer
*trace
;
168 long last_overrun
[NR_CPUS
];
169 long overrun
[NR_CPUS
];
171 /* The below is zeroed out in pipe_read */
172 struct trace_seq seq
;
173 struct trace_entry
*ent
;
176 struct trace_entry
*prev_ent
;
179 unsigned long iter_flags
;
181 unsigned long next_idx
[NR_CPUS
];
182 struct list_head
*next_page
[NR_CPUS
];
183 unsigned next_page_idx
[NR_CPUS
];
187 void tracing_reset(struct trace_array_cpu
*data
);
188 int tracing_open_generic(struct inode
*inode
, struct file
*filp
);
189 struct dentry
*tracing_init_dentry(void);
190 void ftrace(struct trace_array
*tr
,
191 struct trace_array_cpu
*data
,
193 unsigned long parent_ip
,
194 unsigned long flags
);
195 void tracing_sched_switch_trace(struct trace_array
*tr
,
196 struct trace_array_cpu
*data
,
197 struct task_struct
*prev
,
198 struct task_struct
*next
,
199 unsigned long flags
);
200 void tracing_record_cmdline(struct task_struct
*tsk
);
202 void tracing_sched_wakeup_trace(struct trace_array
*tr
,
203 struct trace_array_cpu
*data
,
204 struct task_struct
*wakee
,
205 struct task_struct
*cur
,
206 unsigned long flags
);
207 void trace_special(struct trace_array
*tr
,
208 struct trace_array_cpu
*data
,
212 void trace_function(struct trace_array
*tr
,
213 struct trace_array_cpu
*data
,
215 unsigned long parent_ip
,
216 unsigned long flags
);
218 void tracing_start_function_trace(void);
219 void tracing_stop_function_trace(void);
220 int register_tracer(struct tracer
*type
);
221 void unregister_tracer(struct tracer
*type
);
223 extern unsigned long nsecs_to_usecs(unsigned long nsecs
);
225 extern unsigned long tracing_max_latency
;
226 extern unsigned long tracing_thresh
;
228 extern atomic_t trace_record_cmdline_enabled
;
230 void update_max_tr(struct trace_array
*tr
, struct task_struct
*tsk
, int cpu
);
231 void update_max_tr_single(struct trace_array
*tr
,
232 struct task_struct
*tsk
, int cpu
);
234 extern cycle_t
ftrace_now(int cpu
);
236 #ifdef CONFIG_SCHED_TRACER
238 wakeup_sched_switch(struct task_struct
*prev
, struct task_struct
*next
);
240 wakeup_sched_wakeup(struct task_struct
*wakee
, struct task_struct
*curr
);
243 wakeup_sched_switch(struct task_struct
*prev
, struct task_struct
*next
)
247 wakeup_sched_wakeup(struct task_struct
*wakee
, struct task_struct
*curr
)
252 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
254 (*tracer_switch_func_t
)(void *private,
255 struct task_struct
*prev
,
256 struct task_struct
*next
);
258 struct tracer_switch_ops
{
259 tracer_switch_func_t func
;
261 struct tracer_switch_ops
*next
;
264 extern int register_tracer_switch(struct tracer_switch_ops
*ops
);
265 extern int unregister_tracer_switch(struct tracer_switch_ops
*ops
);
267 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
269 #ifdef CONFIG_DYNAMIC_FTRACE
270 extern unsigned long ftrace_update_tot_cnt
;
271 #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
272 extern int DYN_FTRACE_TEST_NAME(void);
275 #ifdef CONFIG_FTRACE_STARTUP_TEST
277 extern int trace_selftest_startup_function(struct tracer
*trace
,
278 struct trace_array
*tr
);
280 #ifdef CONFIG_IRQSOFF_TRACER
281 extern int trace_selftest_startup_irqsoff(struct tracer
*trace
,
282 struct trace_array
*tr
);
284 #ifdef CONFIG_PREEMPT_TRACER
285 extern int trace_selftest_startup_preemptoff(struct tracer
*trace
,
286 struct trace_array
*tr
);
288 #if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER)
289 extern int trace_selftest_startup_preemptirqsoff(struct tracer
*trace
,
290 struct trace_array
*tr
);
292 #ifdef CONFIG_SCHED_TRACER
293 extern int trace_selftest_startup_wakeup(struct tracer
*trace
,
294 struct trace_array
*tr
);
296 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
297 extern int trace_selftest_startup_sched_switch(struct tracer
*trace
,
298 struct trace_array
*tr
);
300 #endif /* CONFIG_FTRACE_STARTUP_TEST */
302 extern void *head_page(struct trace_array_cpu
*data
);
303 extern int trace_seq_printf(struct trace_seq
*s
, const char *fmt
, ...);
304 extern long ns2usecs(cycle_t nsec
);
306 extern unsigned long trace_flags
;
309 * trace_iterator_flags is an enumeration that defines bit
310 * positions into trace_flags that controls the output.
312 * NOTE: These bits must match the trace_options array in
315 enum trace_iterator_flags
{
316 TRACE_ITER_PRINT_PARENT
= 0x01,
317 TRACE_ITER_SYM_OFFSET
= 0x02,
318 TRACE_ITER_SYM_ADDR
= 0x04,
319 TRACE_ITER_VERBOSE
= 0x08,
320 TRACE_ITER_RAW
= 0x10,
321 TRACE_ITER_HEX
= 0x20,
322 TRACE_ITER_BIN
= 0x40,
323 TRACE_ITER_BLOCK
= 0x80,
324 TRACE_ITER_STACKTRACE
= 0x100,
325 TRACE_ITER_SCHED_TREE
= 0x200,
328 #endif /* _LINUX_KERNEL_TRACE_H */