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bc0c38d1
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1#ifndef _LINUX_KERNEL_TRACE_H
2#define _LINUX_KERNEL_TRACE_H
3
4#include <linux/fs.h>
5#include <asm/atomic.h>
6#include <linux/sched.h>
7#include <linux/clocksource.h>
3928a8a2 8#include <linux/ring_buffer.h>
bd8ac686 9#include <linux/mmiotrace.h>
4e5292ea 10#include <linux/tracepoint.h>
d13744cd 11#include <linux/ftrace.h>
24f1e32c 12#include <linux/hw_breakpoint.h>
9504504c 13#include <linux/trace_seq.h>
97f20251 14#include <linux/ftrace_event.h>
9504504c 15
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16enum trace_type {
17 __TRACE_FIRST_TYPE = 0,
18
19 TRACE_FN,
20 TRACE_CTX,
21 TRACE_WAKE,
22 TRACE_STACK,
dd0e545f 23 TRACE_PRINT,
48ead020 24 TRACE_BPRINT,
72829bc3 25 TRACE_SPECIAL,
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PP
26 TRACE_MMIO_RW,
27 TRACE_MMIO_MAP,
9f029e83 28 TRACE_BRANCH,
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29 TRACE_GRAPH_RET,
30 TRACE_GRAPH_ENT,
02b67518 31 TRACE_USER_STACK,
c71a8961 32 TRACE_BLK,
72829bc3 33
f0868d1e 34 __TRACE_LAST_TYPE,
72829bc3
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35};
36
bc0c38d1 37
0a1c49db
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38#undef __field
39#define __field(type, item) type item;
86387f7e 40
d7315094
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41#undef __field_struct
42#define __field_struct(type, item) __field(type, item)
86387f7e 43
d7315094
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44#undef __field_desc
45#define __field_desc(type, container, item)
02b67518 46
0a1c49db
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47#undef __array
48#define __array(type, item, size) type item[size];
1427cdf0 49
d7315094
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50#undef __array_desc
51#define __array_desc(type, container, item, size)
777e208d 52
0a1c49db
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53#undef __dynamic_array
54#define __dynamic_array(type, item) type item[];
777e208d 55
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56#undef F_STRUCT
57#define F_STRUCT(args...) args
74239072 58
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59#undef FTRACE_ENTRY
60#define FTRACE_ENTRY(name, struct_name, id, tstruct, print) \
61 struct struct_name { \
62 struct trace_entry ent; \
63 tstruct \
64 }
777e208d 65
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66#undef TP_ARGS
67#define TP_ARGS(args...) args
52f232cb 68
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69#undef FTRACE_ENTRY_DUP
70#define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk)
1e9b51c2 71
0a1c49db 72#include "trace_entries.h"
36994e58 73
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74/*
75 * syscalls are special, and need special handling, this is why
76 * they are not included in trace_entries.h
77 */
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FW
78struct syscall_trace_enter {
79 struct trace_entry ent;
80 int nr;
81 unsigned long args[];
82};
83
84struct syscall_trace_exit {
85 struct trace_entry ent;
86 int nr;
99df5a6a 87 long ret;
bed1ffca
FW
88};
89
93ccae7a 90struct kprobe_trace_entry_head {
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91 struct trace_entry ent;
92 unsigned long ip;
413d37d1
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93};
94
93ccae7a 95struct kretprobe_trace_entry_head {
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96 struct trace_entry ent;
97 unsigned long func;
98 unsigned long ret_ip;
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99};
100
fc5e27ae
PP
101/*
102 * trace_flag_type is an enumeration that holds different
103 * states when a trace occurs. These are:
9244489a 104 * IRQS_OFF - interrupts were disabled
9de36825 105 * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
bd9cfca9 106 * NEED_RESCHED - reschedule is requested
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107 * HARDIRQ - inside an interrupt handler
108 * SOFTIRQ - inside a softirq handler
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109 */
110enum trace_flag_type {
111 TRACE_FLAG_IRQS_OFF = 0x01,
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112 TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
113 TRACE_FLAG_NEED_RESCHED = 0x04,
114 TRACE_FLAG_HARDIRQ = 0x08,
115 TRACE_FLAG_SOFTIRQ = 0x10,
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116};
117
5bf9a1ee 118#define TRACE_BUF_SIZE 1024
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119
120/*
121 * The CPU trace array - it consists of thousands of trace entries
122 * plus some other descriptor data: (for example which task started
123 * the trace, etc.)
124 */
125struct trace_array_cpu {
bc0c38d1 126 atomic_t disabled;
2cadf913 127 void *buffer_page; /* ring buffer spare */
4e3c3333 128
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129 unsigned long saved_latency;
130 unsigned long critical_start;
131 unsigned long critical_end;
132 unsigned long critical_sequence;
133 unsigned long nice;
134 unsigned long policy;
135 unsigned long rt_priority;
2f26ebd5 136 unsigned long skipped_entries;
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137 cycle_t preempt_timestamp;
138 pid_t pid;
139 uid_t uid;
140 char comm[TASK_COMM_LEN];
141};
142
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143/*
144 * The trace array - an array of per-CPU trace arrays. This is the
145 * highest level data structure that individual tracers deal with.
146 * They have on/off state as well:
147 */
148struct trace_array {
3928a8a2 149 struct ring_buffer *buffer;
bc0c38d1 150 unsigned long entries;
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151 int cpu;
152 cycle_t time_start;
b3806b43 153 struct task_struct *waiter;
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154 struct trace_array_cpu *data[NR_CPUS];
155};
156
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157#define FTRACE_CMP_TYPE(var, type) \
158 __builtin_types_compatible_p(typeof(var), type *)
159
160#undef IF_ASSIGN
161#define IF_ASSIGN(var, entry, etype, id) \
162 if (FTRACE_CMP_TYPE(var, etype)) { \
163 var = (typeof(var))(entry); \
164 WARN_ON(id && (entry)->type != id); \
165 break; \
166 }
167
168/* Will cause compile errors if type is not found. */
169extern void __ftrace_bad_type(void);
170
171/*
172 * The trace_assign_type is a verifier that the entry type is
173 * the same as the type being assigned. To add new types simply
174 * add a line with the following format:
175 *
176 * IF_ASSIGN(var, ent, type, id);
177 *
178 * Where "type" is the trace type that includes the trace_entry
179 * as the "ent" item. And "id" is the trace identifier that is
180 * used in the trace_type enum.
181 *
182 * If the type can have more than one id, then use zero.
183 */
184#define trace_assign_type(var, ent) \
185 do { \
186 IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
187 IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
7104f300 188 IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
02b67518 189 IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
7104f300 190 IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
48ead020 191 IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
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192 IF_ASSIGN(var, ent, struct special_entry, 0); \
193 IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
194 TRACE_MMIO_RW); \
195 IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
196 TRACE_MMIO_MAP); \
9f029e83 197 IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
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198 IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
199 TRACE_GRAPH_ENT); \
200 IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
201 TRACE_GRAPH_RET); \
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202 __ftrace_bad_type(); \
203 } while (0)
2c4f035f 204
adf9f195
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205/*
206 * An option specific to a tracer. This is a boolean value.
207 * The bit is the bit index that sets its value on the
208 * flags value in struct tracer_flags.
209 */
210struct tracer_opt {
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211 const char *name; /* Will appear on the trace_options file */
212 u32 bit; /* Mask assigned in val field in tracer_flags */
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213};
214
215/*
216 * The set of specific options for a tracer. Your tracer
217 * have to set the initial value of the flags val.
218 */
219struct tracer_flags {
220 u32 val;
9de36825 221 struct tracer_opt *opts;
adf9f195
FW
222};
223
224/* Makes more easy to define a tracer opt */
225#define TRACER_OPT(s, b) .name = #s, .bit = b
226
034939b6 227
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228/**
229 * struct tracer - a specific tracer and its callbacks to interact with debugfs
230 * @name: the name chosen to select it on the available_tracers file
231 * @init: called when one switches to this tracer (echo name > current_tracer)
232 * @reset: called when one switches to another tracer
233 * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
234 * @stop: called when tracing is paused (echo 0 > tracing_enabled)
235 * @open: called when the trace file is opened
236 * @pipe_open: called when the trace_pipe file is opened
237 * @wait_pipe: override how the user waits for traces on trace_pipe
238 * @close: called when the trace file is released
c521efd1 239 * @pipe_close: called when the trace_pipe file is released
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FW
240 * @read: override the default read callback on trace_pipe
241 * @splice_read: override the default splice_read callback on trace_pipe
242 * @selftest: selftest to run on boot (see trace_selftest.c)
243 * @print_headers: override the first lines that describe your columns
244 * @print_line: callback that prints a trace
245 * @set_flag: signals one of your private flags changed (trace_options file)
246 * @flags: your private flags
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247 */
248struct tracer {
249 const char *name;
1c80025a 250 int (*init)(struct trace_array *tr);
bc0c38d1 251 void (*reset)(struct trace_array *tr);
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SR
252 void (*start)(struct trace_array *tr);
253 void (*stop)(struct trace_array *tr);
bc0c38d1 254 void (*open)(struct trace_iterator *iter);
107bad8b 255 void (*pipe_open)(struct trace_iterator *iter);
6eaaa5d5 256 void (*wait_pipe)(struct trace_iterator *iter);
bc0c38d1 257 void (*close)(struct trace_iterator *iter);
c521efd1 258 void (*pipe_close)(struct trace_iterator *iter);
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259 ssize_t (*read)(struct trace_iterator *iter,
260 struct file *filp, char __user *ubuf,
261 size_t cnt, loff_t *ppos);
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EGM
262 ssize_t (*splice_read)(struct trace_iterator *iter,
263 struct file *filp,
264 loff_t *ppos,
265 struct pipe_inode_info *pipe,
266 size_t len,
267 unsigned int flags);
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SR
268#ifdef CONFIG_FTRACE_STARTUP_TEST
269 int (*selftest)(struct tracer *trace,
270 struct trace_array *tr);
271#endif
8bba1bf5 272 void (*print_header)(struct seq_file *m);
2c4f035f 273 enum print_line_t (*print_line)(struct trace_iterator *iter);
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FW
274 /* If you handled the flag setting, return 0 */
275 int (*set_flag)(u32 old_flags, u32 bit, int set);
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276 struct tracer *next;
277 int print_max;
9de36825 278 struct tracer_flags *flags;
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279};
280
f9520750 281
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FW
282#define TRACE_PIPE_ALL_CPU -1
283
b6f11df2 284int tracer_init(struct tracer *t, struct trace_array *tr);
9036990d 285int tracing_is_enabled(void);
45dcd8b8 286void trace_wake_up(void);
3928a8a2 287void tracing_reset(struct trace_array *tr, int cpu);
213cc060 288void tracing_reset_online_cpus(struct trace_array *tr);
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SR
289void tracing_reset_current(int cpu);
290void tracing_reset_current_online_cpus(void);
bc0c38d1 291int tracing_open_generic(struct inode *inode, struct file *filp);
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FW
292struct dentry *trace_create_file(const char *name,
293 mode_t mode,
294 struct dentry *parent,
295 void *data,
296 const struct file_operations *fops);
297
bc0c38d1 298struct dentry *tracing_init_dentry(void);
d618b3e6
IM
299void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
300
51a763dd
ACM
301struct ring_buffer_event;
302
e77405ad
SR
303struct ring_buffer_event *
304trace_buffer_lock_reserve(struct ring_buffer *buffer,
305 int type,
306 unsigned long len,
307 unsigned long flags,
308 int pc);
309void trace_buffer_unlock_commit(struct ring_buffer *buffer,
51a763dd
ACM
310 struct ring_buffer_event *event,
311 unsigned long flags, int pc);
312
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PP
313struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
314 struct trace_array_cpu *data);
c4a8e8be
FW
315
316struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
317 int *ent_cpu, u64 *ent_ts);
318
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319void default_wait_pipe(struct trace_iterator *iter);
320void poll_wait_pipe(struct trace_iterator *iter);
321
bc0c38d1
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322void ftrace(struct trace_array *tr,
323 struct trace_array_cpu *data,
324 unsigned long ip,
325 unsigned long parent_ip,
38697053 326 unsigned long flags, int pc);
bc0c38d1 327void tracing_sched_switch_trace(struct trace_array *tr,
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328 struct task_struct *prev,
329 struct task_struct *next,
38697053 330 unsigned long flags, int pc);
57422797
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331
332void tracing_sched_wakeup_trace(struct trace_array *tr,
57422797
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333 struct task_struct *wakee,
334 struct task_struct *cur,
38697053 335 unsigned long flags, int pc);
f0a920d5
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336void trace_special(struct trace_array *tr,
337 struct trace_array_cpu *data,
338 unsigned long arg1,
339 unsigned long arg2,
38697053 340 unsigned long arg3, int pc);
6fb44b71 341void trace_function(struct trace_array *tr,
6fb44b71
SR
342 unsigned long ip,
343 unsigned long parent_ip,
38697053 344 unsigned long flags, int pc);
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345void trace_default_header(struct seq_file *m);
346void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
347int trace_empty(struct trace_iterator *iter);
bc0c38d1 348
287b6e68 349void trace_graph_return(struct ftrace_graph_ret *trace);
e49dc19c 350int trace_graph_entry(struct ftrace_graph_ent *trace);
1a0799a8 351void set_graph_array(struct trace_array *tr);
1e9b51c2 352
41bc8144
SR
353void tracing_start_cmdline_record(void);
354void tracing_stop_cmdline_record(void);
e168e051
SR
355void tracing_sched_switch_assign_trace(struct trace_array *tr);
356void tracing_stop_sched_switch_record(void);
357void tracing_start_sched_switch_record(void);
bc0c38d1
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358int register_tracer(struct tracer *type);
359void unregister_tracer(struct tracer *type);
b5130b1e 360int is_tracing_stopped(void);
bc0c38d1
SR
361
362extern unsigned long nsecs_to_usecs(unsigned long nsecs);
363
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364extern unsigned long tracing_thresh;
365
5d4a9dba 366#ifdef CONFIG_TRACER_MAX_TRACE
bc0c38d1 367extern unsigned long tracing_max_latency;
bc0c38d1
SR
368
369void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
370void update_max_tr_single(struct trace_array *tr,
371 struct task_struct *tsk, int cpu);
5d4a9dba 372#endif /* CONFIG_TRACER_MAX_TRACE */
bc0c38d1 373
c0a0d0d3 374#ifdef CONFIG_STACKTRACE
e77405ad 375void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
c0a0d0d3
FW
376 int skip, int pc);
377
e77405ad 378void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
c0a0d0d3
FW
379 int pc);
380
381void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
382 int pc);
383#else
e1f7992e 384static inline void ftrace_trace_stack(struct ring_buffer *buffer,
c0a0d0d3
FW
385 unsigned long flags, int skip, int pc)
386{
387}
388
e1f7992e 389static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
c0a0d0d3
FW
390 unsigned long flags, int pc)
391{
392}
393
394static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
395 int skip, int pc)
396{
397}
398#endif /* CONFIG_STACKTRACE */
53614991 399
e309b41d 400extern cycle_t ftrace_now(int cpu);
bc0c38d1 401
4ca53085 402extern void trace_find_cmdline(int pid, char comm[]);
f7d48cbd 403
bc0c38d1
SR
404#ifdef CONFIG_DYNAMIC_FTRACE
405extern unsigned long ftrace_update_tot_cnt;
d05cdb25
SR
406#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
407extern int DYN_FTRACE_TEST_NAME(void);
bc0c38d1
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408#endif
409
020e5f85
LZ
410extern int ring_buffer_expanded;
411extern bool tracing_selftest_disabled;
9288f99a 412DECLARE_PER_CPU(int, ftrace_cpu_disabled);
020e5f85 413
60a11774 414#ifdef CONFIG_FTRACE_STARTUP_TEST
60a11774
SR
415extern int trace_selftest_startup_function(struct tracer *trace,
416 struct trace_array *tr);
7447dce9
FW
417extern int trace_selftest_startup_function_graph(struct tracer *trace,
418 struct trace_array *tr);
60a11774
SR
419extern int trace_selftest_startup_irqsoff(struct tracer *trace,
420 struct trace_array *tr);
60a11774
SR
421extern int trace_selftest_startup_preemptoff(struct tracer *trace,
422 struct trace_array *tr);
60a11774
SR
423extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
424 struct trace_array *tr);
60a11774
SR
425extern int trace_selftest_startup_wakeup(struct tracer *trace,
426 struct trace_array *tr);
fb1b6d8b
SN
427extern int trace_selftest_startup_nop(struct tracer *trace,
428 struct trace_array *tr);
60a11774
SR
429extern int trace_selftest_startup_sched_switch(struct tracer *trace,
430 struct trace_array *tr);
a6dd24f8
IM
431extern int trace_selftest_startup_sysprof(struct tracer *trace,
432 struct trace_array *tr);
80e5ea45
SR
433extern int trace_selftest_startup_branch(struct tracer *trace,
434 struct trace_array *tr);
60a11774
SR
435#endif /* CONFIG_FTRACE_STARTUP_TEST */
436
c7aafc54 437extern void *head_page(struct trace_array_cpu *data);
cf8e3474 438extern unsigned long long ns2usecs(cycle_t nsec);
1fd8f2a3 439extern int
40ce74f1 440trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
48ead020 441extern int
40ce74f1 442trace_vprintk(unsigned long ip, const char *fmt, va_list args);
659372d3
SR
443extern int
444trace_array_vprintk(struct trace_array *tr,
445 unsigned long ip, const char *fmt, va_list args);
446int trace_array_printk(struct trace_array *tr,
447 unsigned long ip, const char *fmt, ...);
c7aafc54 448
4e655519
IM
449extern unsigned long trace_flags;
450
5079f326
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451extern int trace_clock_id;
452
15e6cb36 453/* Standard output formatting function used for function return traces */
fb52607a 454#ifdef CONFIG_FUNCTION_GRAPH_TRACER
62b915f1
JO
455
456/* Flag options */
457#define TRACE_GRAPH_PRINT_OVERRUN 0x1
458#define TRACE_GRAPH_PRINT_CPU 0x2
459#define TRACE_GRAPH_PRINT_OVERHEAD 0x4
460#define TRACE_GRAPH_PRINT_PROC 0x8
461#define TRACE_GRAPH_PRINT_DURATION 0x10
462#define TRACE_GRAPH_PRINT_ABS_TIME 0x20
463
d7a8d9e9
JO
464extern enum print_line_t
465print_graph_function_flags(struct trace_iterator *iter, u32 flags);
466extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
0706f1c4
SR
467extern enum print_line_t
468trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
62b915f1
JO
469extern void graph_trace_open(struct trace_iterator *iter);
470extern void graph_trace_close(struct trace_iterator *iter);
471extern int __trace_graph_entry(struct trace_array *tr,
472 struct ftrace_graph_ent *trace,
473 unsigned long flags, int pc);
474extern void __trace_graph_return(struct trace_array *tr,
475 struct ftrace_graph_ret *trace,
476 unsigned long flags, int pc);
477
ea4e2bc4
SR
478
479#ifdef CONFIG_DYNAMIC_FTRACE
480/* TODO: make this variable */
481#define FTRACE_GRAPH_MAX_FUNCS 32
c7c6b1fe 482extern int ftrace_graph_filter_enabled;
ea4e2bc4
SR
483extern int ftrace_graph_count;
484extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
485
486static inline int ftrace_graph_addr(unsigned long addr)
487{
488 int i;
489
c7c6b1fe 490 if (!ftrace_graph_filter_enabled)
ea4e2bc4
SR
491 return 1;
492
493 for (i = 0; i < ftrace_graph_count; i++) {
494 if (addr == ftrace_graph_funcs[i])
495 return 1;
496 }
497
498 return 0;
499}
15e6cb36 500#else
6b253930
IM
501static inline int ftrace_graph_addr(unsigned long addr)
502{
503 return 1;
ea4e2bc4
SR
504}
505#endif /* CONFIG_DYNAMIC_FTRACE */
ea4e2bc4 506#else /* CONFIG_FUNCTION_GRAPH_TRACER */
15e6cb36 507static inline enum print_line_t
d7a8d9e9 508print_graph_function_flags(struct trace_iterator *iter, u32 flags)
15e6cb36
FW
509{
510 return TRACE_TYPE_UNHANDLED;
511}
ea4e2bc4 512#endif /* CONFIG_FUNCTION_GRAPH_TRACER */
15e6cb36 513
756d17ee 514extern struct list_head ftrace_pids;
804a6851 515
1155de47 516#ifdef CONFIG_FUNCTION_TRACER
804a6851
SR
517static inline int ftrace_trace_task(struct task_struct *task)
518{
756d17ee 519 if (list_empty(&ftrace_pids))
804a6851
SR
520 return 1;
521
522 return test_tsk_trace_trace(task);
523}
1155de47
PM
524#else
525static inline int ftrace_trace_task(struct task_struct *task)
526{
527 return 1;
528}
529#endif
804a6851 530
b63f39ea 531/*
532 * struct trace_parser - servers for reading the user input separated by spaces
533 * @cont: set if the input is not complete - no final space char was found
534 * @buffer: holds the parsed user input
1537a363 535 * @idx: user input length
b63f39ea 536 * @size: buffer size
537 */
538struct trace_parser {
539 bool cont;
540 char *buffer;
541 unsigned idx;
542 unsigned size;
543};
544
545static inline bool trace_parser_loaded(struct trace_parser *parser)
546{
547 return (parser->idx != 0);
548}
549
550static inline bool trace_parser_cont(struct trace_parser *parser)
551{
552 return parser->cont;
553}
554
555static inline void trace_parser_clear(struct trace_parser *parser)
556{
557 parser->cont = false;
558 parser->idx = 0;
559}
560
561extern int trace_parser_get_init(struct trace_parser *parser, int size);
562extern void trace_parser_put(struct trace_parser *parser);
563extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
564 size_t cnt, loff_t *ppos);
565
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566/*
567 * trace_iterator_flags is an enumeration that defines bit
568 * positions into trace_flags that controls the output.
569 *
570 * NOTE: These bits must match the trace_options array in
571 * trace.c.
572 */
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573enum trace_iterator_flags {
574 TRACE_ITER_PRINT_PARENT = 0x01,
575 TRACE_ITER_SYM_OFFSET = 0x02,
576 TRACE_ITER_SYM_ADDR = 0x04,
577 TRACE_ITER_VERBOSE = 0x08,
578 TRACE_ITER_RAW = 0x10,
579 TRACE_ITER_HEX = 0x20,
580 TRACE_ITER_BIN = 0x40,
581 TRACE_ITER_BLOCK = 0x80,
582 TRACE_ITER_STACKTRACE = 0x100,
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583 TRACE_ITER_PRINTK = 0x200,
584 TRACE_ITER_PREEMPTONLY = 0x400,
585 TRACE_ITER_BRANCH = 0x800,
586 TRACE_ITER_ANNOTATE = 0x1000,
587 TRACE_ITER_USERSTACKTRACE = 0x2000,
588 TRACE_ITER_SYM_USEROBJ = 0x4000,
589 TRACE_ITER_PRINTK_MSGONLY = 0x8000,
590 TRACE_ITER_CONTEXT_INFO = 0x10000, /* Print pid/cpu/time */
591 TRACE_ITER_LATENCY_FMT = 0x20000,
592 TRACE_ITER_SLEEP_TIME = 0x40000,
593 TRACE_ITER_GRAPH_TIME = 0x80000,
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594};
595
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596/*
597 * TRACE_ITER_SYM_MASK masks the options in trace_flags that
598 * control the output of kernel symbols.
599 */
600#define TRACE_ITER_SYM_MASK \
601 (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
602
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603extern struct tracer nop_trace;
604
2ed84eeb 605#ifdef CONFIG_BRANCH_TRACER
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606extern int enable_branch_tracing(struct trace_array *tr);
607extern void disable_branch_tracing(void);
608static inline int trace_branch_enable(struct trace_array *tr)
52f232cb 609{
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610 if (trace_flags & TRACE_ITER_BRANCH)
611 return enable_branch_tracing(tr);
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612 return 0;
613}
9f029e83 614static inline void trace_branch_disable(void)
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615{
616 /* due to races, always disable */
9f029e83 617 disable_branch_tracing();
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618}
619#else
9f029e83 620static inline int trace_branch_enable(struct trace_array *tr)
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621{
622 return 0;
623}
9f029e83 624static inline void trace_branch_disable(void)
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625{
626}
2ed84eeb 627#endif /* CONFIG_BRANCH_TRACER */
52f232cb 628
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629/* set ring buffers to default size if not already done so */
630int tracing_update_buffers(void);
631
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632/* trace event type bit fields, not numeric */
633enum {
634 TRACE_EVENT_TYPE_PRINTF = 1,
635 TRACE_EVENT_TYPE_RAW = 2,
636};
637
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638struct ftrace_event_field {
639 struct list_head link;
640 char *name;
641 char *type;
aa38e9fc 642 int filter_type;
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643 int offset;
644 int size;
a118e4d1 645 int is_signed;
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646};
647
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648struct event_filter {
649 int n_preds;
650 struct filter_pred **preds;
8b372562 651 char *filter_string;
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652};
653
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654struct event_subsystem {
655 struct list_head list;
656 const char *name;
657 struct dentry *entry;
1f9963cb 658 struct event_filter *filter;
dc82ec98 659 int nr_events;
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660};
661
7ce7e424 662struct filter_pred;
1889d209 663struct regex;
7ce7e424 664
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665typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event,
666 int val1, int val2);
7ce7e424 667
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668typedef int (*regex_match_func)(char *str, struct regex *r, int len);
669
3f6fe06d 670enum regex_type {
b0f1a59a 671 MATCH_FULL = 0,
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672 MATCH_FRONT_ONLY,
673 MATCH_MIDDLE_ONLY,
674 MATCH_END_ONLY,
675};
676
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677struct regex {
678 char pattern[MAX_FILTER_STR_VAL];
679 int len;
680 int field_len;
681 regex_match_func match;
682};
683
7ce7e424 684struct filter_pred {
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685 filter_pred_fn_t fn;
686 u64 val;
687 struct regex regex;
688 char *field_name;
689 int offset;
690 int not;
691 int op;
692 int pop_n;
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693};
694
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695extern struct list_head ftrace_common_fields;
696
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697extern enum regex_type
698filter_parse_regex(char *buff, int len, char **search, int *not);
8b372562 699extern void print_event_filter(struct ftrace_event_call *call,
4bda2d51 700 struct trace_seq *s);
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701extern int apply_event_filter(struct ftrace_event_call *call,
702 char *filter_string);
703extern int apply_subsystem_event_filter(struct event_subsystem *system,
704 char *filter_string);
705extern void print_subsystem_event_filter(struct event_subsystem *system,
ac1adc55 706 struct trace_seq *s);
aa38e9fc 707extern int filter_assign_type(const char *type);
7ce7e424 708
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709struct list_head *
710trace_get_fields(struct ftrace_event_call *event_call);
711
eb02ce01 712static inline int
e1112b4d 713filter_check_discard(struct ftrace_event_call *call, void *rec,
eb02ce01 714 struct ring_buffer *buffer,
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715 struct ring_buffer_event *event)
716{
553552ce 717 if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
6fb2915d 718 !filter_match_preds(call->filter, rec)) {
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719 ring_buffer_discard_commit(buffer, event);
720 return 1;
721 }
722
723 return 0;
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724}
725
20c8928a 726extern struct mutex event_mutex;
a59fd602 727extern struct list_head ftrace_events;
ac199db0 728
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729extern const char *__start___trace_bprintk_fmt[];
730extern const char *__stop___trace_bprintk_fmt[];
731
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732#undef FTRACE_ENTRY
733#define FTRACE_ENTRY(call, struct_name, id, tstruct, print) \
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734 extern struct ftrace_event_call \
735 __attribute__((__aligned__(4))) event_##call;
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736#undef FTRACE_ENTRY_DUP
737#define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print) \
738 FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print))
739#include "trace_entries.h"
e1112b4d 740
bc0c38d1 741#endif /* _LINUX_KERNEL_TRACE_H */