Merge branch 'mini2440-dev-unlikely' into mini2440-dev
[linux-2.6/mini2440.git] / include / linux / ftrace_event.h
blob4ec5e67e18cfda40ad34a52187a3ff288682f6be
1 #ifndef _LINUX_FTRACE_EVENT_H
2 #define _LINUX_FTRACE_EVENT_H
4 #include <linux/ring_buffer.h>
5 #include <linux/trace_seq.h>
6 #include <linux/percpu.h>
7 #include <linux/hardirq.h>
9 struct trace_array;
10 struct tracer;
11 struct dentry;
13 DECLARE_PER_CPU(struct trace_seq, ftrace_event_seq);
15 struct trace_print_flags {
16 unsigned long mask;
17 const char *name;
20 const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
21 unsigned long flags,
22 const struct trace_print_flags *flag_array);
24 const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
25 const struct trace_print_flags *symbol_array);
28 * The trace entry - the most basic unit of tracing. This is what
29 * is printed in the end as a single line in the trace output, such as:
31 * bash-15816 [01] 235.197585: idle_cpu <- irq_enter
33 struct trace_entry {
34 unsigned short type;
35 unsigned char flags;
36 unsigned char preempt_count;
37 int pid;
38 int lock_depth;
41 #define FTRACE_MAX_EVENT \
42 ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
45 * Trace iterator - used by printout routines who present trace
46 * results to users and which routines might sleep, etc:
48 struct trace_iterator {
49 struct trace_array *tr;
50 struct tracer *trace;
51 void *private;
52 int cpu_file;
53 struct mutex mutex;
54 struct ring_buffer_iter *buffer_iter[NR_CPUS];
55 unsigned long iter_flags;
57 /* The below is zeroed out in pipe_read */
58 struct trace_seq seq;
59 struct trace_entry *ent;
60 int cpu;
61 u64 ts;
63 loff_t pos;
64 long idx;
66 cpumask_var_t started;
70 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
71 int flags);
72 struct trace_event {
73 struct hlist_node node;
74 struct list_head list;
75 int type;
76 trace_print_func trace;
77 trace_print_func raw;
78 trace_print_func hex;
79 trace_print_func binary;
82 extern int register_ftrace_event(struct trace_event *event);
83 extern int unregister_ftrace_event(struct trace_event *event);
85 /* Return values for print_line callback */
86 enum print_line_t {
87 TRACE_TYPE_PARTIAL_LINE = 0, /* Retry after flushing the seq */
88 TRACE_TYPE_HANDLED = 1,
89 TRACE_TYPE_UNHANDLED = 2, /* Relay to other output functions */
90 TRACE_TYPE_NO_CONSUME = 3 /* Handled but ask to not consume */
93 void tracing_generic_entry_update(struct trace_entry *entry,
94 unsigned long flags,
95 int pc);
96 struct ring_buffer_event *
97 trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
98 int type, unsigned long len,
99 unsigned long flags, int pc);
100 void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
101 struct ring_buffer_event *event,
102 unsigned long flags, int pc);
103 void trace_nowake_buffer_unlock_commit(struct ring_buffer *buffer,
104 struct ring_buffer_event *event,
105 unsigned long flags, int pc);
106 void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
107 struct ring_buffer_event *event);
109 void tracing_record_cmdline(struct task_struct *tsk);
111 struct event_filter;
113 struct ftrace_event_call {
114 struct list_head list;
115 char *name;
116 char *system;
117 struct dentry *dir;
118 struct trace_event *event;
119 int enabled;
120 int (*regfunc)(void *);
121 void (*unregfunc)(void *);
122 int id;
123 int (*raw_init)(void);
124 int (*show_format)(struct ftrace_event_call *call,
125 struct trace_seq *s);
126 int (*define_fields)(struct ftrace_event_call *);
127 struct list_head fields;
128 int filter_active;
129 struct event_filter *filter;
130 void *mod;
131 void *data;
133 atomic_t profile_count;
134 int (*profile_enable)(void);
135 void (*profile_disable)(void);
138 #define FTRACE_MAX_PROFILE_SIZE 2048
140 extern char *trace_profile_buf;
141 extern char *trace_profile_buf_nmi;
143 #define MAX_FILTER_PRED 32
144 #define MAX_FILTER_STR_VAL 256 /* Should handle KSYM_SYMBOL_LEN */
146 extern void destroy_preds(struct ftrace_event_call *call);
147 extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
148 extern int filter_current_check_discard(struct ring_buffer *buffer,
149 struct ftrace_event_call *call,
150 void *rec,
151 struct ring_buffer_event *event);
153 enum {
154 FILTER_OTHER = 0,
155 FILTER_STATIC_STRING,
156 FILTER_DYN_STRING,
157 FILTER_PTR_STRING,
160 extern int trace_define_field(struct ftrace_event_call *call,
161 const char *type, const char *name,
162 int offset, int size, int is_signed,
163 int filter_type);
164 extern int trace_define_common_fields(struct ftrace_event_call *call);
166 #define is_signed_type(type) (((type)(-1)) < 0)
168 int trace_set_clr_event(const char *system, const char *event, int set);
171 * The double __builtin_constant_p is because gcc will give us an error
172 * if we try to allocate the static variable to fmt if it is not a
173 * constant. Even with the outer if statement optimizing out.
175 #define event_trace_printk(ip, fmt, args...) \
176 do { \
177 __trace_printk_check_format(fmt, ##args); \
178 tracing_record_cmdline(current); \
179 if (__builtin_constant_p(fmt)) { \
180 static const char *trace_printk_fmt \
181 __attribute__((section("__trace_printk_fmt"))) = \
182 __builtin_constant_p(fmt) ? fmt : NULL; \
184 __trace_bprintk(ip, trace_printk_fmt, ##args); \
185 } else \
186 __trace_printk(ip, fmt, ##args); \
187 } while (0)
189 #endif /* _LINUX_FTRACE_EVENT_H */