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-rw-r--r--kernel/trace/trace.h313
1 files changed, 313 insertions, 0 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
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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>
8
9enum trace_type {
10 __TRACE_FIRST_TYPE = 0,
11
12 TRACE_FN,
13 TRACE_CTX,
14 TRACE_WAKE,
15 TRACE_STACK,
16 TRACE_SPECIAL,
17
18 __TRACE_LAST_TYPE
19};
20
21/*
22 * Function trace entry - function address and parent function addres:
23 */
24struct ftrace_entry {
25 unsigned long ip;
26 unsigned long parent_ip;
27};
28
29/*
30 * Context switch trace entry - which task (and prio) we switched from/to:
31 */
32struct 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;
39};
40
41/*
42 * Special (free-form) trace entry:
43 */
44struct special_entry {
45 unsigned long arg1;
46 unsigned long arg2;
47 unsigned long arg3;
48};
49
50/*
51 * Stack-trace entry:
52 */
53
54#define FTRACE_STACK_ENTRIES 8
55
56struct stack_entry {
57 unsigned long caller[FTRACE_STACK_ENTRIES];
58};
59
60/*
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:
63 *
64 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
65 */
66struct trace_entry {
67 char type;
68 char cpu;
69 char flags;
70 char preempt_count;
71 int pid;
72 cycle_t t;
73 union {
74 struct ftrace_entry fn;
75 struct ctx_switch_entry ctx;
76 struct special_entry special;
77 struct stack_entry stack;
78 };
79};
80
81#define TRACE_ENTRY_SIZE sizeof(struct trace_entry)
82
83/*
84 * The CPU trace array - it consists of thousands of trace entries
85 * plus some other descriptor data: (for example which task started
86 * the trace, etc.)
87 */
88struct trace_array_cpu {
89 struct list_head trace_pages;
90 atomic_t disabled;
91 raw_spinlock_t lock;
92 struct lock_class_key lock_key;
93
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;
105 unsigned long nice;
106 unsigned long policy;
107 unsigned long rt_priority;
108 cycle_t preempt_timestamp;
109 pid_t pid;
110 uid_t uid;
111 char comm[TASK_COMM_LEN];
112};
113
114struct trace_iterator;
115
116/*
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:
120 */
121struct trace_array {
122 unsigned long entries;
123 long ctrl;
124 int cpu;
125 cycle_t time_start;
126 struct task_struct *waiter;
127 struct trace_array_cpu *data[NR_CPUS];
128};
129
130/*
131 * A specific tracer, represented by methods that operate on a trace array:
132 */
133struct tracer {
134 const char *name;
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);
149#endif
150 int (*print_line)(struct trace_iterator *iter);
151 struct tracer *next;
152 int print_max;
153};
154
155struct trace_seq {
156 unsigned char buffer[PAGE_SIZE];
157 unsigned int len;
158 unsigned int readpos;
159};
160
161/*
162 * Trace iterator - used by printout routines who present trace
163 * results to users and which routines might sleep, etc:
164 */
165struct trace_iterator {
166 struct trace_array *tr;
167 struct tracer *trace;
168 void *private;
169 long last_overrun[NR_CPUS];
170 long overrun[NR_CPUS];
171
172 /* The below is zeroed out in pipe_read */
173 struct trace_seq seq;
174 struct trace_entry *ent;
175 int cpu;
176
177 struct trace_entry *prev_ent;
178 int prev_cpu;
179
180 unsigned long iter_flags;
181 loff_t pos;
182 unsigned long next_idx[NR_CPUS];
183 struct list_head *next_page[NR_CPUS];
184 unsigned next_page_idx[NR_CPUS];
185 long idx;
186};
187
188void tracing_reset(struct trace_array_cpu *data);
189int tracing_open_generic(struct inode *inode, struct file *filp);
190struct dentry *tracing_init_dentry(void);
191void ftrace(struct trace_array *tr,
192 struct trace_array_cpu *data,
193 unsigned long ip,
194 unsigned long parent_ip,
195 unsigned long flags);
196void tracing_sched_switch_trace(struct trace_array *tr,
197 struct trace_array_cpu *data,
198 struct task_struct *prev,
199 struct task_struct *next,
200 unsigned long flags);
201void tracing_record_cmdline(struct task_struct *tsk);
202
203void tracing_sched_wakeup_trace(struct trace_array *tr,
204 struct trace_array_cpu *data,
205 struct task_struct *wakee,
206 struct task_struct *cur,
207 unsigned long flags);
208void trace_special(struct trace_array *tr,
209 struct trace_array_cpu *data,
210 unsigned long arg1,
211 unsigned long arg2,
212 unsigned long arg3);
213void trace_function(struct trace_array *tr,
214 struct trace_array_cpu *data,
215 unsigned long ip,
216 unsigned long parent_ip,
217 unsigned long flags);
218
219void tracing_start_function_trace(void);
220void tracing_stop_function_trace(void);
221void tracing_start_cmdline_record(void);
222void tracing_stop_cmdline_record(void);
223int register_tracer(struct tracer *type);
224void unregister_tracer(struct tracer *type);
225
226extern unsigned long nsecs_to_usecs(unsigned long nsecs);
227
228extern unsigned long tracing_max_latency;
229extern unsigned long tracing_thresh;
230
231void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
232void update_max_tr_single(struct trace_array *tr,
233 struct task_struct *tsk, int cpu);
234
235extern cycle_t ftrace_now(int cpu);
236
237#ifdef CONFIG_CONTEXT_SWITCH_TRACER
238typedef void
239(*tracer_switch_func_t)(void *private,
240 void *__rq,
241 struct task_struct *prev,
242 struct task_struct *next);
243
244struct tracer_switch_ops {
245 tracer_switch_func_t func;
246 void *private;
247 struct tracer_switch_ops *next;
248};
249
250#endif /* CONFIG_CONTEXT_SWITCH_TRACER */
251
252#ifdef CONFIG_DYNAMIC_FTRACE
253extern unsigned long ftrace_update_tot_cnt;
254#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
255extern int DYN_FTRACE_TEST_NAME(void);
256#endif
257
258#ifdef CONFIG_FTRACE_STARTUP_TEST
259#ifdef CONFIG_FTRACE
260extern int trace_selftest_startup_function(struct tracer *trace,
261 struct trace_array *tr);
262#endif
263#ifdef CONFIG_IRQSOFF_TRACER
264extern int trace_selftest_startup_irqsoff(struct tracer *trace,
265 struct trace_array *tr);
266#endif
267#ifdef CONFIG_PREEMPT_TRACER
268extern int trace_selftest_startup_preemptoff(struct tracer *trace,
269 struct trace_array *tr);
270#endif
271#if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER)
272extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
273 struct trace_array *tr);
274#endif
275#ifdef CONFIG_SCHED_TRACER
276extern int trace_selftest_startup_wakeup(struct tracer *trace,
277 struct trace_array *tr);
278#endif
279#ifdef CONFIG_CONTEXT_SWITCH_TRACER
280extern int trace_selftest_startup_sched_switch(struct tracer *trace,
281 struct trace_array *tr);
282#endif
283#endif /* CONFIG_FTRACE_STARTUP_TEST */
284
285extern void *head_page(struct trace_array_cpu *data);
286extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
287extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
288 size_t cnt);
289extern long ns2usecs(cycle_t nsec);
290
291extern unsigned long trace_flags;
292
293/*
294 * trace_iterator_flags is an enumeration that defines bit
295 * positions into trace_flags that controls the output.
296 *
297 * NOTE: These bits must match the trace_options array in
298 * trace.c.
299 */
300enum trace_iterator_flags {
301 TRACE_ITER_PRINT_PARENT = 0x01,
302 TRACE_ITER_SYM_OFFSET = 0x02,
303 TRACE_ITER_SYM_ADDR = 0x04,
304 TRACE_ITER_VERBOSE = 0x08,
305 TRACE_ITER_RAW = 0x10,
306 TRACE_ITER_HEX = 0x20,
307 TRACE_ITER_BIN = 0x40,
308 TRACE_ITER_BLOCK = 0x80,
309 TRACE_ITER_STACKTRACE = 0x100,
310 TRACE_ITER_SCHED_TREE = 0x200,
311};
312
313#endif /* _LINUX_KERNEL_TRACE_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-23 22:46:21 -0500