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   1 #ifndef _LINUX_FTRACE_EVENT_H
   2 #define _LINUX_FTRACE_EVENT_H
   3
   4 #include <linux/trace_seq.h>
   5 #include <linux/ring_buffer.h>
   6
   7
   8 struct trace_array;
   9 struct tracer;
  10
  11 /*
  12  * The trace entry - the most basic unit of tracing. This is what
  13  * is printed in the end as a single line in the trace output, such as:
  14  *
  15  *     bash-15816 [01]   235.197585: idle_cpu <- irq_enter
  16  */
  17 struct trace_entry {
  18         unsigned char           type;
  19         unsigned char           flags;
  20         unsigned char           preempt_count;
  21         int                     pid;
  22         int                     tgid;
  23 };
  24
  25 /*
  26  * Trace iterator - used by printout routines who present trace
  27  * results to users and which routines might sleep, etc:
  28  */
  29 struct trace_iterator {
  30         struct trace_array      *tr;
  31         struct tracer           *trace;
  32         void                    *private;
  33         int                     cpu_file;
  34         struct mutex            mutex;
  35         struct ring_buffer_iter *buffer_iter[NR_CPUS];
  36
  37         /* The below is zeroed out in pipe_read */
  38         struct trace_seq        seq;
  39         struct trace_entry      *ent;
  40         int                     cpu;
  41         u64                     ts;
  42
  43         unsigned long           iter_flags;
  44         loff_t                  pos;
  45         long                    idx;
  46
  47         cpumask_var_t           started;
  48 };
  49
  50
  51 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
  52                                               int flags);
  53 struct trace_event {
  54         struct hlist_node       node;
  55         int                     type;
  56         trace_print_func        trace;
  57         trace_print_func        raw;
  58         trace_print_func        hex;
  59         trace_print_func        binary;
  60 };
  61
  62 extern int register_ftrace_event(struct trace_event *event);
  63 extern int unregister_ftrace_event(struct trace_event *event);
  64
  65 /* Return values for print_line callback */
  66 enum print_line_t {
  67         TRACE_TYPE_PARTIAL_LINE = 0,    /* Retry after flushing the seq */
  68         TRACE_TYPE_HANDLED      = 1,
  69         TRACE_TYPE_UNHANDLED    = 2,    /* Relay to other output functions */
  70         TRACE_TYPE_NO_CONSUME   = 3     /* Handled but ask to not consume */
  71 };
  72
  73
  74 struct ring_buffer_event *
  75 trace_current_buffer_lock_reserve(unsigned char type, unsigned long len,
  76                                   unsigned long flags, int pc);
  77 void trace_current_buffer_unlock_commit(struct ring_buffer_event *event,
  78                                         unsigned long flags, int pc);
  79 void trace_nowake_buffer_unlock_commit(struct ring_buffer_event *event,
  80                                         unsigned long flags, int pc);
  81 void trace_current_buffer_discard_commit(struct ring_buffer_event *event);
  82
  83 void tracing_record_cmdline(struct task_struct *tsk);
  84
  85 struct ftrace_event_call {
  86         char                    *name;
  87         char                    *system;
  88         struct dentry           *dir;
  89         int                     enabled;
  90         int                     (*regfunc)(void);
  91         void                    (*unregfunc)(void);
  92         int                     id;
  93         int                     (*raw_init)(void);
  94         int                     (*show_format)(struct trace_seq *s);
  95         int                     (*define_fields)(void);
  96         struct list_head        fields;
  97         int                     n_preds;
  98         struct filter_pred      **preds;
  99
 100 #ifdef CONFIG_EVENT_PROFILE
 101         atomic_t        profile_count;
 102         int             (*profile_enable)(struct ftrace_event_call *);
 103         void            (*profile_disable)(struct ftrace_event_call *);
 104 #endif
 105 };
 106
 107 #define MAX_FILTER_PRED         8
 108 #define MAX_FILTER_STR_VAL      128
 109
 110 extern int init_preds(struct ftrace_event_call *call);
 111 extern int filter_match_preds(struct ftrace_event_call *call, void *rec);
 112 extern int filter_current_check_discard(struct ftrace_event_call *call,
 113                                         void *rec,
 114                                         struct ring_buffer_event *event);
 115
 116 extern int trace_define_field(struct ftrace_event_call *call, char *type,
 117                               char *name, int offset, int size);
 118
 119
 120 /*
 121  * The double __builtin_constant_p is because gcc will give us an error
 122  * if we try to allocate the static variable to fmt if it is not a
 123  * constant. Even with the outer if statement optimizing out.
 124  */
 125 #define event_trace_printk(ip, fmt, args...)                            \
 126 do {                                                                    \
 127         __trace_printk_check_format(fmt, ##args);                       \
 128         tracing_record_cmdline(current);                                \
 129         if (__builtin_constant_p(fmt)) {                                \
 130                 static const char *trace_printk_fmt                     \
 131                   __attribute__((section("__trace_printk_fmt"))) =      \
 132                         __builtin_constant_p(fmt) ? fmt : NULL;         \
 133                                                                         \
 134                 __trace_bprintk(ip, trace_printk_fmt, ##args);          \
 135         } else                                                          \
 136                 __trace_printk(ip, fmt, ##args);                        \
 137 } while (0)
 138
 139 #define __common_field(type, item)                                      \
 140         ret = trace_define_field(event_call, #type, "common_" #item,    \
 141                                  offsetof(typeof(field.ent), item),     \
 142                                  sizeof(field.ent.item));               \
 143         if (ret)                                                        \
 144                 return ret;
 145
 146 #endif /* _LINUX_FTRACE_EVENT_H */