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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
   9 /*
  10  * Function trace entry - function address and parent function addres:
  11  */
  12 struct ftrace_entry {
  13         unsigned long           ip;
  14         unsigned long           parent_ip;
  15 };
  16
  17 /*
  18  * Context switch trace entry - which task (and prio) we switched from/to:
  19  */
  20 struct ctx_switch_entry {
  21         unsigned int            prev_pid;
  22         unsigned char           prev_prio;
  23         unsigned char           prev_state;
  24         unsigned int            next_pid;
  25         unsigned char           next_prio;
  26 };
  27
  28 /*
  29  * The trace entry - the most basic unit of tracing. This is what
  30  * is printed in the end as a single line in the trace output, such as:
  31  *
  32  *     bash-15816 [01]   235.197585: idle_cpu <- irq_enter
  33  */
  34 struct trace_entry {
  35         char                    type;
  36         char                    cpu;
  37         char                    flags;
  38         char                    preempt_count;
  39         int                     pid;
  40         cycle_t                 t;
  41         union {
  42                 struct ftrace_entry             fn;
  43                 struct ctx_switch_entry         ctx;
  44         };
  45 };
  46
  47 #define TRACE_ENTRY_SIZE        sizeof(struct trace_entry)
  48
  49 /*
  50  * The CPU trace array - it consists of thousands of trace entries
  51  * plus some other descriptor data: (for example which task started
  52  * the trace, etc.)
  53  */
  54 struct trace_array_cpu {
  55         struct list_head        trace_pages;
  56         atomic_t                disabled;
  57         spinlock_t              lock;
  58         struct lock_class_key   lock_key;
  59
  60         /* these fields get copied into max-trace: */
  61         unsigned                trace_head_idx;
  62         unsigned                trace_tail_idx;
  63         void                    *trace_head; /* producer */
  64         void                    *trace_tail; /* consumer */
  65         unsigned long           trace_idx;
  66         unsigned long           saved_latency;
  67         unsigned long           critical_start;
  68         unsigned long           critical_end;
  69         unsigned long           critical_sequence;
  70         unsigned long           nice;
  71         unsigned long           policy;
  72         unsigned long           rt_priority;
  73         cycle_t                 preempt_timestamp;
  74         pid_t                   pid;
  75         uid_t                   uid;
  76         char                    comm[TASK_COMM_LEN];
  77 };
  78
  79 struct trace_iterator;
  80
  81 /*
  82  * The trace array - an array of per-CPU trace arrays. This is the
  83  * highest level data structure that individual tracers deal with.
  84  * They have on/off state as well:
  85  */
  86 struct trace_array {
  87         unsigned long           entries;
  88         long                    ctrl;
  89         int                     cpu;
  90         cycle_t                 time_start;
  91         struct task_struct      *waiter;
  92         struct trace_array_cpu  *data[NR_CPUS];
  93 };
  94
  95 /*
  96  * A specific tracer, represented by methods that operate on a trace array:
  97  */
  98 struct tracer {
  99         const char              *name;
 100         void                    (*init)(struct trace_array *tr);
 101         void                    (*reset)(struct trace_array *tr);
 102         void                    (*open)(struct trace_iterator *iter);
 103         void                    (*close)(struct trace_iterator *iter);
 104         void                    (*start)(struct trace_iterator *iter);
 105         void                    (*stop)(struct trace_iterator *iter);
 106         void                    (*ctrl_update)(struct trace_array *tr);
 107 #ifdef CONFIG_FTRACE_STARTUP_TEST
 108         int                     (*selftest)(struct tracer *trace,
 109                                             struct trace_array *tr);
 110 #endif
 111         struct tracer           *next;
 112         int                     print_max;
 113 };
 114
 115 struct trace_seq {
 116         unsigned char           buffer[PAGE_SIZE];
 117         unsigned int            len;
 118 };
 119
 120 /*
 121  * Trace iterator - used by printout routines who present trace
 122  * results to users and which routines might sleep, etc:
 123  */
 124 struct trace_iterator {
 125         struct trace_seq        seq;
 126         struct trace_array      *tr;
 127         struct tracer           *trace;
 128
 129         struct trace_entry      *ent;
 130         int                     cpu;
 131
 132         struct trace_entry      *prev_ent;
 133         int                     prev_cpu;
 134
 135         unsigned long           iter_flags;
 136         loff_t                  pos;
 137         unsigned long           next_idx[NR_CPUS];
 138         struct list_head        *next_page[NR_CPUS];
 139         unsigned                next_page_idx[NR_CPUS];
 140         long                    idx;
 141 };
 142
 143 void notrace tracing_reset(struct trace_array_cpu *data);
 144 int tracing_open_generic(struct inode *inode, struct file *filp);
 145 struct dentry *tracing_init_dentry(void);
 146 void ftrace(struct trace_array *tr,
 147                             struct trace_array_cpu *data,
 148                             unsigned long ip,
 149                             unsigned long parent_ip,
 150                             unsigned long flags);
 151 void tracing_sched_switch_trace(struct trace_array *tr,
 152                                 struct trace_array_cpu *data,
 153                                 struct task_struct *prev,
 154                                 struct task_struct *next,
 155                                 unsigned long flags);
 156 void tracing_record_cmdline(struct task_struct *tsk);
 157
 158 void tracing_start_function_trace(void);
 159 void tracing_stop_function_trace(void);
 160 int register_tracer(struct tracer *type);
 161 void unregister_tracer(struct tracer *type);
 162
 163 extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 164
 165 extern unsigned long tracing_max_latency;
 166 extern unsigned long tracing_thresh;
 167
 168 void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
 169 void update_max_tr_single(struct trace_array *tr,
 170                           struct task_struct *tsk, int cpu);
 171
 172 extern notrace cycle_t ftrace_now(int cpu);
 173
 174 #ifdef CONFIG_SCHED_TRACER
 175 extern void notrace
 176 wakeup_sched_switch(struct task_struct *prev, struct task_struct *next);
 177 #else
 178 static inline void
 179 wakeup_sched_switch(struct task_struct *prev, struct task_struct *next)
 180 {
 181 }
 182 #endif
 183
 184 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
 185 typedef void
 186 (*tracer_switch_func_t)(void *private,
 187                         struct task_struct *prev,
 188                         struct task_struct *next);
 189
 190 struct tracer_switch_ops {
 191         tracer_switch_func_t            func;
 192         void                            *private;
 193         struct tracer_switch_ops        *next;
 194 };
 195
 196 extern int register_tracer_switch(struct tracer_switch_ops *ops);
 197 extern int unregister_tracer_switch(struct tracer_switch_ops *ops);
 198
 199 #endif /* CONFIG_CONTEXT_SWITCH_TRACER */
 200
 201 #ifdef CONFIG_DYNAMIC_FTRACE
 202 extern unsigned long ftrace_update_tot_cnt;
 203 #endif
 204
 205 #ifdef CONFIG_FTRACE_STARTUP_TEST
 206 #ifdef CONFIG_FTRACE
 207 extern int trace_selftest_startup_function(struct tracer *trace,
 208                                            struct trace_array *tr);
 209 #endif
 210 #ifdef CONFIG_IRQSOFF_TRACER
 211 extern int trace_selftest_startup_irqsoff(struct tracer *trace,
 212                                           struct trace_array *tr);
 213 #endif
 214 #ifdef CONFIG_PREEMPT_TRACER
 215 extern int trace_selftest_startup_preemptoff(struct tracer *trace,
 216                                              struct trace_array *tr);
 217 #endif
 218 #if defined(CONFIG_IRQSOFF_TRACER) && defined(CONFIG_PREEMPT_TRACER)
 219 extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
 220                                                  struct trace_array *tr);
 221 #endif
 222 #ifdef CONFIG_SCHED_TRACER
 223 extern int trace_selftest_startup_wakeup(struct tracer *trace,
 224                                          struct trace_array *tr);
 225 #endif
 226 #ifdef CONFIG_CONTEXT_SWITCH_TRACER
 227 extern int trace_selftest_startup_sched_switch(struct tracer *trace,
 228                                                struct trace_array *tr);
 229 #endif
 230 #endif /* CONFIG_FTRACE_STARTUP_TEST */
 231
 232 extern void *head_page(struct trace_array_cpu *data);
 233
 234 #endif /* _LINUX_KERNEL_TRACE_H */