| 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 | unsigned long idx; |
| 42 | union { |
| 43 | struct ftrace_entry fn; |
| 44 | struct ctx_switch_entry ctx; |
| 45 | }; |
| 46 | }; |
| 47 | |
| 48 | #define TRACE_ENTRY_SIZE sizeof(struct trace_entry) |
| 49 | |
| 50 | /* |
| 51 | * The CPU trace array - it consists of thousands of trace entries |
| 52 | * plus some other descriptor data: (for example which task started |
| 53 | * the trace, etc.) |
| 54 | */ |
| 55 | struct trace_array_cpu { |
| 56 | void *trace; |
| 57 | unsigned long trace_idx; |
| 58 | atomic_t disabled; |
| 59 | atomic_t underrun; |
| 60 | unsigned long saved_latency; |
| 61 | unsigned long critical_start; |
| 62 | unsigned long critical_end; |
| 63 | unsigned long critical_sequence; |
| 64 | unsigned long nice; |
| 65 | unsigned long policy; |
| 66 | unsigned long rt_priority; |
| 67 | cycle_t preempt_timestamp; |
| 68 | pid_t pid; |
| 69 | uid_t uid; |
| 70 | char comm[TASK_COMM_LEN]; |
| 71 | }; |
| 72 | |
| 73 | struct trace_iterator; |
| 74 | |
| 75 | /* |
| 76 | * The trace array - an array of per-CPU trace arrays. This is the |
| 77 | * highest level data structure that individual tracers deal with. |
| 78 | * They have on/off state as well: |
| 79 | */ |
| 80 | struct trace_array { |
| 81 | unsigned long entries; |
| 82 | long ctrl; |
| 83 | int cpu; |
| 84 | cycle_t time_start; |
| 85 | struct trace_array_cpu *data[NR_CPUS]; |
| 86 | }; |
| 87 | |
| 88 | /* |
| 89 | * A specific tracer, represented by methods that operate on a trace array: |
| 90 | */ |
| 91 | struct tracer { |
| 92 | const char *name; |
| 93 | void (*init)(struct trace_array *tr); |
| 94 | void (*reset)(struct trace_array *tr); |
| 95 | void (*open)(struct trace_iterator *iter); |
| 96 | void (*close)(struct trace_iterator *iter); |
| 97 | void (*start)(struct trace_iterator *iter); |
| 98 | void (*stop)(struct trace_iterator *iter); |
| 99 | void (*ctrl_update)(struct trace_array *tr); |
| 100 | struct tracer *next; |
| 101 | int print_max; |
| 102 | }; |
| 103 | |
| 104 | /* |
| 105 | * Trace iterator - used by printout routines who present trace |
| 106 | * results to users and which routines might sleep, etc: |
| 107 | */ |
| 108 | struct trace_iterator { |
| 109 | struct trace_array *tr; |
| 110 | struct tracer *trace; |
| 111 | struct trace_entry *ent; |
| 112 | unsigned long iter_flags; |
| 113 | loff_t pos; |
| 114 | unsigned long next_idx[NR_CPUS]; |
| 115 | int cpu; |
| 116 | int idx; |
| 117 | }; |
| 118 | |
| 119 | void notrace tracing_reset(struct trace_array_cpu *data); |
| 120 | int tracing_open_generic(struct inode *inode, struct file *filp); |
| 121 | struct dentry *tracing_init_dentry(void); |
| 122 | void ftrace(struct trace_array *tr, |
| 123 | struct trace_array_cpu *data, |
| 124 | unsigned long ip, |
| 125 | unsigned long parent_ip, |
| 126 | unsigned long flags); |
| 127 | void tracing_sched_switch_trace(struct trace_array *tr, |
| 128 | struct trace_array_cpu *data, |
| 129 | struct task_struct *prev, |
| 130 | struct task_struct *next, |
| 131 | unsigned long flags); |
| 132 | void tracing_record_cmdline(struct task_struct *tsk); |
| 133 | |
| 134 | void tracing_start_function_trace(void); |
| 135 | void tracing_stop_function_trace(void); |
| 136 | int register_tracer(struct tracer *type); |
| 137 | void unregister_tracer(struct tracer *type); |
| 138 | |
| 139 | extern unsigned long nsecs_to_usecs(unsigned long nsecs); |
| 140 | |
| 141 | extern unsigned long tracing_max_latency; |
| 142 | extern unsigned long tracing_thresh; |
| 143 | |
| 144 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu); |
| 145 | void update_max_tr_single(struct trace_array *tr, |
| 146 | struct task_struct *tsk, int cpu); |
| 147 | |
| 148 | static inline notrace cycle_t now(int cpu) |
| 149 | { |
| 150 | return cpu_clock(cpu); |
| 151 | } |
| 152 | |
| 153 | #ifdef CONFIG_SCHED_TRACER |
| 154 | extern void notrace |
| 155 | wakeup_sched_switch(struct task_struct *prev, struct task_struct *next); |
| 156 | #else |
| 157 | static inline void |
| 158 | wakeup_sched_switch(struct task_struct *prev, struct task_struct *next) |
| 159 | { |
| 160 | } |
| 161 | #endif |
| 162 | |
| 163 | #ifdef CONFIG_CONTEXT_SWITCH_TRACER |
| 164 | typedef void |
| 165 | (*tracer_switch_func_t)(void *private, |
| 166 | struct task_struct *prev, |
| 167 | struct task_struct *next); |
| 168 | |
| 169 | struct tracer_switch_ops { |
| 170 | tracer_switch_func_t func; |
| 171 | void *private; |
| 172 | struct tracer_switch_ops *next; |
| 173 | }; |
| 174 | |
| 175 | extern int register_tracer_switch(struct tracer_switch_ops *ops); |
| 176 | extern int unregister_tracer_switch(struct tracer_switch_ops *ops); |
| 177 | |
| 178 | #endif /* CONFIG_CONTEXT_SWITCH_TRACER */ |
| 179 | |
| 180 | #ifdef CONFIG_DYNAMIC_FTRACE |
| 181 | extern unsigned long ftrace_update_tot_cnt; |
| 182 | #endif |
| 183 | |
| 184 | #endif /* _LINUX_KERNEL_TRACE_H */ |