Pileus Git - ~andy/linux/blob - include/linux/ftrace_event.h

   1 #ifndef _LINUX_FTRACE_EVENT_H
   2 #define _LINUX_FTRACE_EVENT_H
   3
   4 #include <linux/ring_buffer.h>
   5 #include <linux/trace_seq.h>
   6 #include <linux/percpu.h>
   7 #include <linux/hardirq.h>
   8 #include <linux/perf_event.h>
   9
  10 struct trace_array;
  11 struct tracer;
  12 struct dentry;
  13
  14 struct trace_print_flags {
  15         unsigned long           mask;
  16         const char              *name;
  17 };
  18
  19 struct trace_print_flags_u64 {
  20         unsigned long long      mask;
  21         const char              *name;
  22 };
  23
  24 const char *ftrace_print_flags_seq(struct trace_seq *p, const char *delim,
  25                                    unsigned long flags,
  26                                    const struct trace_print_flags *flag_array);
  27
  28 const char *ftrace_print_symbols_seq(struct trace_seq *p, unsigned long val,
  29                                      const struct trace_print_flags *symbol_array);
  30
  31 #if BITS_PER_LONG == 32
  32 const char *ftrace_print_symbols_seq_u64(struct trace_seq *p,
  33                                          unsigned long long val,
  34                                          const struct trace_print_flags_u64
  35                                                                  *symbol_array);
  36 #endif
  37
  38 const char *ftrace_print_hex_seq(struct trace_seq *p,
  39                                  const unsigned char *buf, int len);
  40
  41 /*
  42  * The trace entry - the most basic unit of tracing. This is what
  43  * is printed in the end as a single line in the trace output, such as:
  44  *
  45  *     bash-15816 [01]   235.197585: idle_cpu <- irq_enter
  46  */
  47 struct trace_entry {
  48         unsigned short          type;
  49         unsigned char           flags;
  50         unsigned char           preempt_count;
  51         int                     pid;
  52 };
  53
  54 #define FTRACE_MAX_EVENT                                                \
  55         ((1 << (sizeof(((struct trace_entry *)0)->type) * 8)) - 1)
  56
  57 /*
  58  * Trace iterator - used by printout routines who present trace
  59  * results to users and which routines might sleep, etc:
  60  */
  61 struct trace_iterator {
  62         struct trace_array      *tr;
  63         struct tracer           *trace;
  64         void                    *private;
  65         int                     cpu_file;
  66         struct mutex            mutex;
  67         struct ring_buffer_iter **buffer_iter;
  68         unsigned long           iter_flags;
  69
  70         /* trace_seq for __print_flags() and __print_symbolic() etc. */
  71         struct trace_seq        tmp_seq;
  72
  73         /* The below is zeroed out in pipe_read */
  74         struct trace_seq        seq;
  75         struct trace_entry      *ent;
  76         unsigned long           lost_events;
  77         int                     leftover;
  78         int                     ent_size;
  79         int                     cpu;
  80         u64                     ts;
  81
  82         loff_t                  pos;
  83         long                    idx;
  84
  85         cpumask_var_t           started;
  86 };
  87
  88 enum trace_iter_flags {
  89         TRACE_FILE_LAT_FMT      = 1,
  90         TRACE_FILE_ANNOTATE     = 2,
  91         TRACE_FILE_TIME_IN_NS   = 4,
  92 };
  93
  94
  95 struct trace_event;
  96
  97 typedef enum print_line_t (*trace_print_func)(struct trace_iterator *iter,
  98                                       int flags, struct trace_event *event);
  99
 100 struct trace_event_functions {
 101         trace_print_func        trace;
 102         trace_print_func        raw;
 103         trace_print_func        hex;
 104         trace_print_func        binary;
 105 };
 106
 107 struct trace_event {
 108         struct hlist_node               node;
 109         struct list_head                list;
 110         int                             type;
 111         struct trace_event_functions    *funcs;
 112 };
 113
 114 extern int register_ftrace_event(struct trace_event *event);
 115 extern int unregister_ftrace_event(struct trace_event *event);
 116
 117 /* Return values for print_line callback */
 118 enum print_line_t {
 119         TRACE_TYPE_PARTIAL_LINE = 0,    /* Retry after flushing the seq */
 120         TRACE_TYPE_HANDLED      = 1,
 121         TRACE_TYPE_UNHANDLED    = 2,    /* Relay to other output functions */
 122         TRACE_TYPE_NO_CONSUME   = 3     /* Handled but ask to not consume */
 123 };
 124
 125 void tracing_generic_entry_update(struct trace_entry *entry,
 126                                   unsigned long flags,
 127                                   int pc);
 128 struct ring_buffer_event *
 129 trace_current_buffer_lock_reserve(struct ring_buffer **current_buffer,
 130                                   int type, unsigned long len,
 131                                   unsigned long flags, int pc);
 132 void trace_current_buffer_unlock_commit(struct ring_buffer *buffer,
 133                                         struct ring_buffer_event *event,
 134                                         unsigned long flags, int pc);
 135 void trace_buffer_unlock_commit(struct ring_buffer *buffer,
 136                                 struct ring_buffer_event *event,
 137                                 unsigned long flags, int pc);
 138 void trace_buffer_unlock_commit_regs(struct ring_buffer *buffer,
 139                                      struct ring_buffer_event *event,
 140                                      unsigned long flags, int pc,
 141                                      struct pt_regs *regs);
 142 void trace_current_buffer_discard_commit(struct ring_buffer *buffer,
 143                                          struct ring_buffer_event *event);
 144
 145 void tracing_record_cmdline(struct task_struct *tsk);
 146
 147 struct event_filter;
 148
 149 enum trace_reg {
 150         TRACE_REG_REGISTER,
 151         TRACE_REG_UNREGISTER,
 152 #ifdef CONFIG_PERF_EVENTS
 153         TRACE_REG_PERF_REGISTER,
 154         TRACE_REG_PERF_UNREGISTER,
 155         TRACE_REG_PERF_OPEN,
 156         TRACE_REG_PERF_CLOSE,
 157         TRACE_REG_PERF_ADD,
 158         TRACE_REG_PERF_DEL,
 159 #endif
 160 };
 161
 162 struct ftrace_event_call;
 163
 164 struct ftrace_event_class {
 165         char                    *system;
 166         void                    *probe;
 167 #ifdef CONFIG_PERF_EVENTS
 168         void                    *perf_probe;
 169 #endif
 170         int                     (*reg)(struct ftrace_event_call *event,
 171                                        enum trace_reg type, void *data);
 172         int                     (*define_fields)(struct ftrace_event_call *);
 173         struct list_head        *(*get_fields)(struct ftrace_event_call *);
 174         struct list_head        fields;
 175         int                     (*raw_init)(struct ftrace_event_call *);
 176 };
 177
 178 extern int ftrace_event_reg(struct ftrace_event_call *event,
 179                             enum trace_reg type, void *data);
 180
 181 enum {
 182         TRACE_EVENT_FL_ENABLED_BIT,
 183         TRACE_EVENT_FL_FILTERED_BIT,
 184         TRACE_EVENT_FL_RECORDED_CMD_BIT,
 185         TRACE_EVENT_FL_CAP_ANY_BIT,
 186         TRACE_EVENT_FL_NO_SET_FILTER_BIT,
 187         TRACE_EVENT_FL_IGNORE_ENABLE_BIT,
 188 };
 189
 190 enum {
 191         TRACE_EVENT_FL_ENABLED          = (1 << TRACE_EVENT_FL_ENABLED_BIT),
 192         TRACE_EVENT_FL_FILTERED         = (1 << TRACE_EVENT_FL_FILTERED_BIT),
 193         TRACE_EVENT_FL_RECORDED_CMD     = (1 << TRACE_EVENT_FL_RECORDED_CMD_BIT),
 194         TRACE_EVENT_FL_CAP_ANY          = (1 << TRACE_EVENT_FL_CAP_ANY_BIT),
 195         TRACE_EVENT_FL_NO_SET_FILTER    = (1 << TRACE_EVENT_FL_NO_SET_FILTER_BIT),
 196         TRACE_EVENT_FL_IGNORE_ENABLE    = (1 << TRACE_EVENT_FL_IGNORE_ENABLE_BIT),
 197 };
 198
 199 struct ftrace_event_call {
 200         struct list_head        list;
 201         struct ftrace_event_class *class;
 202         char                    *name;
 203         struct dentry           *dir;
 204         struct trace_event      event;
 205         const char              *print_fmt;
 206         struct event_filter     *filter;
 207         void                    *mod;
 208         void                    *data;
 209
 210         /*
 211          * 32 bit flags:
 212          *   bit 1:             enabled
 213          *   bit 2:             filter_active
 214          *   bit 3:             enabled cmd record
 215          *   bit 4:             allow trace by non root (cap any)
 216          *   bit 5:             failed to apply filter
 217          *   bit 6:             ftrace internal event (do not enable)
 218          *
 219          * Changes to flags must hold the event_mutex.
 220          *
 221          * Note: Reads of flags do not hold the event_mutex since
 222          * they occur in critical sections. But the way flags
 223          * is currently used, these changes do no affect the code
 224          * except that when a change is made, it may have a slight
 225          * delay in propagating the changes to other CPUs due to
 226          * caching and such.
 227          */
 228         unsigned int            flags;
 229
 230 #ifdef CONFIG_PERF_EVENTS
 231         int                             perf_refcount;
 232         struct hlist_head __percpu      *perf_events;
 233 #endif
 234 };
 235
 236 #define __TRACE_EVENT_FLAGS(name, value)                                \
 237         static int __init trace_init_flags_##name(void)                 \
 238         {                                                               \
 239                 event_##name.flags = value;                             \
 240                 return 0;                                               \
 241         }                                                               \
 242         early_initcall(trace_init_flags_##name);
 243
 244 #define PERF_MAX_TRACE_SIZE     2048
 245
 246 #define MAX_FILTER_STR_VAL      256     /* Should handle KSYM_SYMBOL_LEN */
 247
 248 extern void destroy_preds(struct ftrace_event_call *call);
 249 extern int filter_match_preds(struct event_filter *filter, void *rec);
 250 extern int filter_current_check_discard(struct ring_buffer *buffer,
 251                                         struct ftrace_event_call *call,
 252                                         void *rec,
 253                                         struct ring_buffer_event *event);
 254
 255 enum {
 256         FILTER_OTHER = 0,
 257         FILTER_STATIC_STRING,
 258         FILTER_DYN_STRING,
 259         FILTER_PTR_STRING,
 260         FILTER_TRACE_FN,
 261 };
 262
 263 #define EVENT_STORAGE_SIZE 128
 264 extern struct mutex event_storage_mutex;
 265 extern char event_storage[EVENT_STORAGE_SIZE];
 266
 267 extern int trace_event_raw_init(struct ftrace_event_call *call);
 268 extern int trace_define_field(struct ftrace_event_call *call, const char *type,
 269                               const char *name, int offset, int size,
 270                               int is_signed, int filter_type);
 271 extern int trace_add_event_call(struct ftrace_event_call *call);
 272 extern void trace_remove_event_call(struct ftrace_event_call *call);
 273
 274 #define is_signed_type(type)    (((type)(-1)) < (type)0)
 275
 276 int trace_set_clr_event(const char *system, const char *event, int set);
 277
 278 /*
 279  * The double __builtin_constant_p is because gcc will give us an error
 280  * if we try to allocate the static variable to fmt if it is not a
 281  * constant. Even with the outer if statement optimizing out.
 282  */
 283 #define event_trace_printk(ip, fmt, args...)                            \
 284 do {                                                                    \
 285         __trace_printk_check_format(fmt, ##args);                       \
 286         tracing_record_cmdline(current);                                \
 287         if (__builtin_constant_p(fmt)) {                                \
 288                 static const char *trace_printk_fmt                     \
 289                   __attribute__((section("__trace_printk_fmt"))) =      \
 290                         __builtin_constant_p(fmt) ? fmt : NULL;         \
 291                                                                         \
 292                 __trace_bprintk(ip, trace_printk_fmt, ##args);          \
 293         } else                                                          \
 294                 __trace_printk(ip, fmt, ##args);                        \
 295 } while (0)
 296
 297 #ifdef CONFIG_PERF_EVENTS
 298 struct perf_event;
 299
 300 DECLARE_PER_CPU(struct pt_regs, perf_trace_regs);
 301
 302 extern int  perf_trace_init(struct perf_event *event);
 303 extern void perf_trace_destroy(struct perf_event *event);
 304 extern int  perf_trace_add(struct perf_event *event, int flags);
 305 extern void perf_trace_del(struct perf_event *event, int flags);
 306 extern int  ftrace_profile_set_filter(struct perf_event *event, int event_id,
 307                                      char *filter_str);
 308 extern void ftrace_profile_free_filter(struct perf_event *event);
 309 extern void *perf_trace_buf_prepare(int size, unsigned short type,
 310                                     struct pt_regs *regs, int *rctxp);
 311
 312 static inline void
 313 perf_trace_buf_submit(void *raw_data, int size, int rctx, u64 addr,
 314                        u64 count, struct pt_regs *regs, void *head,
 315                        struct task_struct *task)
 316 {
 317         perf_tp_event(addr, count, raw_data, size, regs, head, rctx, task);
 318 }
 319 #endif
 320
 321 #endif /* _LINUX_FTRACE_EVENT_H */