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-rw-r--r--kernel/trace/trace.h339
1 files changed, 339 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#include <linux/mmiotrace.h>
9
10enum trace_type {
11 __TRACE_FIRST_TYPE = 0,
12
13 TRACE_FN,
14 TRACE_CTX,
15 TRACE_WAKE,
16 TRACE_STACK,
17 TRACE_SPECIAL,
18 TRACE_MMIO_RW,
19 TRACE_MMIO_MAP,
20
21 __TRACE_LAST_TYPE
22};
23
24/*
25 * Function trace entry - function address and parent function addres:
26 */
27struct ftrace_entry {
28 unsigned long ip;
29 unsigned long parent_ip;
30};
31
32/*
33 * Context switch trace entry - which task (and prio) we switched from/to:
34 */
35struct ctx_switch_entry {
36 unsigned int prev_pid;
37 unsigned char prev_prio;
38 unsigned char prev_state;
39 unsigned int next_pid;
40 unsigned char next_prio;
41 unsigned char next_state;
42};
43
44/*
45 * Special (free-form) trace entry:
46 */
47struct special_entry {
48 unsigned long arg1;
49 unsigned long arg2;
50 unsigned long arg3;
51};
52
53/*
54 * Stack-trace entry:
55 */
56
57#define FTRACE_STACK_ENTRIES 8
58
59struct stack_entry {
60 unsigned long caller[FTRACE_STACK_ENTRIES];
61};
62
63/*
64 * The trace entry - the most basic unit of tracing. This is what
65 * is printed in the end as a single line in the trace output, such as:
66 *
67 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
68 */
69struct trace_entry {
70 char type;
71 char cpu;
72 char flags;
73 char preempt_count;
74 int pid;
75 cycle_t t;
76 union {
77 struct ftrace_entry fn;
78 struct ctx_switch_entry ctx;
79 struct special_entry special;
80 struct stack_entry stack;
81 struct mmiotrace_rw mmiorw;
82 struct mmiotrace_map mmiomap;
83 };
84};
85
86#define TRACE_ENTRY_SIZE sizeof(struct trace_entry)
87
88/*
89 * The CPU trace array - it consists of thousands of trace entries
90 * plus some other descriptor data: (for example which task started
91 * the trace, etc.)
92 */
93struct trace_array_cpu {
94 struct list_head trace_pages;
95 atomic_t disabled;
96 raw_spinlock_t lock;
97 struct lock_class_key lock_key;
98
99 /* these fields get copied into max-trace: */
100 unsigned trace_head_idx;
101 unsigned trace_tail_idx;
102 void *trace_head; /* producer */
103 void *trace_tail; /* consumer */
104 unsigned long trace_idx;
105 unsigned long overrun;
106 unsigned long saved_latency;
107 unsigned long critical_start;
108 unsigned long critical_end;
109 unsigned long critical_sequence;
110 unsigned long nice;
111 unsigned long policy;
112 unsigned long rt_priority;
113 cycle_t preempt_timestamp;
114 pid_t pid;
115 uid_t uid;
116 char comm[TASK_COMM_LEN];
117};
118
119struct trace_iterator;
120
121/*
122 * The trace array - an array of per-CPU trace arrays. This is the
123 * highest level data structure that individual tracers deal with.
124 * They have on/off state as well:
125 */
126struct trace_array {
127 unsigned long entries;
128 long ctrl;
129 int cpu;
130 cycle_t time_start;
131 struct task_struct *waiter;
132 struct trace_array_cpu *data[NR_CPUS];
133};
134
135/*
136 * A specific tracer, represented by methods that operate on a trace array:
137 */
138struct tracer {
139 const char *name;
140 void (*init)(struct trace_array *tr);
141 void (*reset)(struct trace_array *tr);
142 void (*open)(struct trace_iterator *iter);
143 void (*pipe_open)(struct trace_iterator *iter);
144 void (*close)(struct trace_iterator *iter);
145 void (*start)(struct trace_iterator *iter);
146 void (*stop)(struct trace_iterator *iter);
147 ssize_t (*read)(struct trace_iterator *iter,
148 struct file *filp, char __user *ubuf,
149 size_t cnt, loff_t *ppos);
150 void (*ctrl_update)(struct trace_array *tr);
151#ifdef CONFIG_FTRACE_STARTUP_TEST
152 int (*selftest)(struct tracer *trace,
153 struct trace_array *tr);
154#endif
155 int (*print_line)(struct trace_iterator *iter);
156 struct tracer *next;
157 int print_max;
158};
159
160struct trace_seq {
161 unsigned char buffer[PAGE_SIZE];
162 unsigned int len;
163 unsigned int readpos;
164};
165
166/*
167 * Trace iterator - used by printout routines who present trace
168 * results to users and which routines might sleep, etc:
169 */
170struct trace_iterator {
171 struct trace_array *tr;
172 struct tracer *trace;
173 void *private;
174 long last_overrun[NR_CPUS];
175 long overrun[NR_CPUS];
176
177 /* The below is zeroed out in pipe_read */
178 struct trace_seq seq;
179 struct trace_entry *ent;
180 int cpu;
181
182 struct trace_entry *prev_ent;
183 int prev_cpu;
184
185 unsigned long iter_flags;
186 loff_t pos;
187 unsigned long next_idx[NR_CPUS];
188 struct list_head *next_page[NR_CPUS];
189 unsigned next_page_idx[NR_CPUS];
190 long idx;
191};
192
193void tracing_reset(struct trace_array_cpu *data);
194int tracing_open_generic(struct inode *inode, struct file *filp);
195struct dentry *tracing_init_dentry(void);
196void init_tracer_sysprof_debugfs(struct dentry *d_tracer);
197
198void ftrace(struct trace_array *tr,
199 struct trace_array_cpu *data,
200 unsigned long ip,
201 unsigned long parent_ip,
202 unsigned long flags);
203void tracing_sched_switch_trace(struct trace_array *tr,
204 struct trace_array_cpu *data,
205 struct task_struct *prev,
206 struct task_struct *next,
207 unsigned long flags);
208void tracing_record_cmdline(struct task_struct *tsk);
209
210void tracing_sched_wakeup_trace(struct trace_array *tr,
211 struct trace_array_cpu *data,
212 struct task_struct *wakee,
213 struct task_struct *cur,
214 unsigned long flags);
215void trace_special(struct trace_array *tr,
216 struct trace_array_cpu *data,
217 unsigned long arg1,
218 unsigned long arg2,
219 unsigned long arg3);
220void trace_function(struct trace_array *tr,
221 struct trace_array_cpu *data,
222 unsigned long ip,
223 unsigned long parent_ip,
224 unsigned long flags);
225
226void tracing_start_cmdline_record(void);
227void tracing_stop_cmdline_record(void);
228int register_tracer(struct tracer *type);
229void unregister_tracer(struct tracer *type);
230
231extern unsigned long nsecs_to_usecs(unsigned long nsecs);
232
233extern unsigned long tracing_max_latency;
234extern unsigned long tracing_thresh;
235
236void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
237void update_max_tr_single(struct trace_array *tr,
238 struct task_struct *tsk, int cpu);
239
240extern cycle_t ftrace_now(int cpu);
241
242#ifdef CONFIG_FTRACE
243void tracing_start_function_trace(void);
244void tracing_stop_function_trace(void);
245#else
246# define tracing_start_function_trace() do { } while (0)
247# define tracing_stop_function_trace() do { } while (0)
248#endif
249
250#ifdef CONFIG_CONTEXT_SWITCH_TRACER
251typedef void
252(*tracer_switch_func_t)(void *private,
253 void *__rq,
254 struct task_struct *prev,
255 struct task_struct *next);
256
257struct tracer_switch_ops {
258 tracer_switch_func_t func;
259 void *private;
260 struct tracer_switch_ops *next;
261};
262
263#endif /* CONFIG_CONTEXT_SWITCH_TRACER */
264
265#ifdef CONFIG_DYNAMIC_FTRACE
266extern unsigned long ftrace_update_tot_cnt;
267#define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
268extern int DYN_FTRACE_TEST_NAME(void);
269#endif
270
271#ifdef CONFIG_MMIOTRACE
272extern void __trace_mmiotrace_rw(struct trace_array *tr,
273 struct trace_array_cpu *data,
274 struct mmiotrace_rw *rw);
275extern void __trace_mmiotrace_map(struct trace_array *tr,
276 struct trace_array_cpu *data,
277 struct mmiotrace_map *map);
278#endif
279
280#ifdef CONFIG_FTRACE_STARTUP_TEST
281#ifdef CONFIG_FTRACE
282extern int trace_selftest_startup_function(struct tracer *trace,
283 struct trace_array *tr);
284#endif
285#ifdef CONFIG_IRQSOFF_TRACER
286extern int trace_selftest_startup_irqsoff(struct tracer *trace,
287 struct trace_array *tr);
288#endif
289#ifdef CONFIG_PREEMPT_TRACER
290extern int trace_selftest_startup_preemptoff(struct tracer *trace,
291 struct trace_array *tr);
292#endif
293#if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER)
294extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
295 struct trace_array *tr);
296#endif
297#ifdef CONFIG_SCHED_TRACER
298extern int trace_selftest_startup_wakeup(struct tracer *trace,
299 struct trace_array *tr);
300#endif
301#ifdef CONFIG_CONTEXT_SWITCH_TRACER
302extern int trace_selftest_startup_sched_switch(struct tracer *trace,
303 struct trace_array *tr);
304#endif
305#ifdef CONFIG_SYSPROF_TRACER
306extern int trace_selftest_startup_sysprof(struct tracer *trace,
307 struct trace_array *tr);
308#endif
309#endif /* CONFIG_FTRACE_STARTUP_TEST */
310
311extern void *head_page(struct trace_array_cpu *data);
312extern int trace_seq_printf(struct trace_seq *s, const char *fmt, ...);
313extern ssize_t trace_seq_to_user(struct trace_seq *s, char __user *ubuf,
314 size_t cnt);
315extern long ns2usecs(cycle_t nsec);
316
317extern unsigned long trace_flags;
318
319/*
320 * trace_iterator_flags is an enumeration that defines bit
321 * positions into trace_flags that controls the output.
322 *
323 * NOTE: These bits must match the trace_options array in
324 * trace.c.
325 */
326enum trace_iterator_flags {
327 TRACE_ITER_PRINT_PARENT = 0x01,
328 TRACE_ITER_SYM_OFFSET = 0x02,
329 TRACE_ITER_SYM_ADDR = 0x04,
330 TRACE_ITER_VERBOSE = 0x08,
331 TRACE_ITER_RAW = 0x10,
332 TRACE_ITER_HEX = 0x20,
333 TRACE_ITER_BIN = 0x40,
334 TRACE_ITER_BLOCK = 0x80,
335 TRACE_ITER_STACKTRACE = 0x100,
336 TRACE_ITER_SCHED_TREE = 0x200,
337};
338
339#endif /* _LINUX_KERNEL_TRACE_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-10 15:46:48 -0500