| 1 | #ifndef _LINUX_KERNEL_TRACE_H
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| 2 | #define _LINUX_KERNEL_TRACE_H
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| 3 |
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| 4 | #include <linux/fs.h>
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| 5 | #include <linux/atomic.h>
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| 6 | #include <linux/sched.h>
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| 7 | #include <linux/clocksource.h>
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| 8 | #include <linux/ring_buffer.h>
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| 9 | #include <linux/mmiotrace.h>
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| 10 | #include <linux/tracepoint.h>
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| 11 | #include <linux/ftrace.h>
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| 12 | #include <linux/hw_breakpoint.h>
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| 13 | #include <linux/trace_seq.h>
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| 14 | #include <linux/ftrace_event.h>
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| 15 |
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| 16 | enum trace_type {
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| 17 | __TRACE_FIRST_TYPE = 0,
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| 18 |
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| 19 | TRACE_FN,
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| 20 | TRACE_CTX,
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| 21 | TRACE_WAKE,
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| 22 | TRACE_STACK,
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| 23 | TRACE_PRINT,
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| 24 | TRACE_BPRINT,
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| 25 | TRACE_MMIO_RW,
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| 26 | TRACE_MMIO_MAP,
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| 27 | TRACE_BRANCH,
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| 28 | TRACE_GRAPH_RET,
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| 29 | TRACE_GRAPH_ENT,
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| 30 | TRACE_USER_STACK,
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| 31 | TRACE_BLK,
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| 32 |
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| 33 | __TRACE_LAST_TYPE,
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| 34 | };
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| 35 |
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| 36 |
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| 37 | #undef __field
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| 38 | #define __field(type, item) type item;
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| 39 |
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| 40 | #undef __field_struct
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| 41 | #define __field_struct(type, item) __field(type, item)
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| 42 |
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| 43 | #undef __field_desc
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| 44 | #define __field_desc(type, container, item)
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| 45 |
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| 46 | #undef __array
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| 47 | #define __array(type, item, size) type item[size];
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| 48 |
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| 49 | #undef __array_desc
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| 50 | #define __array_desc(type, container, item, size)
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| 51 |
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| 52 | #undef __dynamic_array
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| 53 | #define __dynamic_array(type, item) type item[];
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| 54 |
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| 55 | #undef F_STRUCT
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| 56 | #define F_STRUCT(args...) args
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| 57 |
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| 58 | #undef FTRACE_ENTRY
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| 59 | #define FTRACE_ENTRY(name, struct_name, id, tstruct, print, filter) \
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| 60 | struct struct_name { \
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| 61 | struct trace_entry ent; \
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| 62 | tstruct \
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| 63 | }
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| 64 |
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| 65 | #undef TP_ARGS
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| 66 | #define TP_ARGS(args...) args
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| 67 |
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| 68 | #undef FTRACE_ENTRY_DUP
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| 69 | #define FTRACE_ENTRY_DUP(name, name_struct, id, tstruct, printk, filter)
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| 70 |
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| 71 | #undef FTRACE_ENTRY_REG
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| 72 | #define FTRACE_ENTRY_REG(name, struct_name, id, tstruct, print, \
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| 73 | filter, regfn) \
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| 74 | FTRACE_ENTRY(name, struct_name, id, PARAMS(tstruct), PARAMS(print), \
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| 75 | filter)
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| 76 |
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| 77 | #include "trace_entries.h"
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| 78 |
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| 79 | |
| 80 | * syscalls are special, and need special handling, this is why
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| 81 | * they are not included in trace_entries.h
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| 82 |
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| 83 | struct syscall_trace_enter {
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| 84 | struct trace_entry ent;
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| 85 | int nr;
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| 86 | unsigned long args[];
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| 87 | };
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| 88 |
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| 89 | struct syscall_trace_exit {
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| 90 | struct trace_entry ent;
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| 91 | int nr;
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| 92 | long ret;
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| 93 | };
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| 94 |
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| 95 | struct kprobe_trace_entry_head {
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| 96 | struct trace_entry ent;
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| 97 | unsigned long ip;
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| 98 | };
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| 99 |
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| 100 | struct kretprobe_trace_entry_head {
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| 101 | struct trace_entry ent;
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| 102 | unsigned long func;
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| 103 | unsigned long ret_ip;
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| 104 | };
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| 105 |
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| 106 | struct uprobe_trace_entry_head {
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| 107 | struct trace_entry ent;
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| 108 | unsigned long ip;
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| 109 | };
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| 110 |
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| 111 | |
| 112 | * trace_flag_type is an enumeration that holds different
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| 113 | * states when a trace occurs. These are:
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| 114 | * IRQS_OFF - interrupts were disabled
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| 115 | * IRQS_NOSUPPORT - arch does not support irqs_disabled_flags
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| 116 | * NEED_RESCHED - reschedule is requested
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| 117 | * HARDIRQ - inside an interrupt handler
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| 118 | * SOFTIRQ - inside a softirq handler
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| 119 |
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| 120 | enum trace_flag_type {
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| 121 | TRACE_FLAG_IRQS_OFF = 0x01,
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| 122 | TRACE_FLAG_IRQS_NOSUPPORT = 0x02,
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| 123 | TRACE_FLAG_NEED_RESCHED = 0x04,
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| 124 | TRACE_FLAG_HARDIRQ = 0x08,
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| 125 | TRACE_FLAG_SOFTIRQ = 0x10,
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| 126 | };
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| 127 |
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| 128 | #define TRACE_BUF_SIZE 1024
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| 129 |
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| 130 | |
| 131 | * The CPU trace array - it consists of thousands of trace entries
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| 132 | * plus some other descriptor data: (for example which task started
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| 133 | * the trace, etc.)
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| 134 |
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| 135 | struct trace_array_cpu {
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| 136 | atomic_t disabled;
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| 137 | void *buffer_page;
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| 138 |
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| 139 | unsigned long entries;
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| 140 | unsigned long saved_latency;
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| 141 | unsigned long critical_start;
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| 142 | unsigned long critical_end;
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| 143 | unsigned long critical_sequence;
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| 144 | unsigned long nice;
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| 145 | unsigned long policy;
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| 146 | unsigned long rt_priority;
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| 147 | unsigned long skipped_entries;
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| 148 | cycle_t preempt_timestamp;
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| 149 | pid_t pid;
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| 150 | kuid_t uid;
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| 151 | char comm[TASK_COMM_LEN];
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| 152 | };
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| 153 |
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| 154 | |
| 155 | * The trace array - an array of per-CPU trace arrays. This is the
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| 156 | * highest level data structure that individual tracers deal with.
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| 157 | * They have on/off state as well:
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| 158 |
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| 159 | struct trace_array {
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| 160 | struct ring_buffer *buffer;
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| 161 | int cpu;
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| 162 | int buffer_disabled;
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| 163 | cycle_t time_start;
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| 164 | struct task_struct *waiter;
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| 165 | struct trace_array_cpu *data[NR_CPUS];
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| 166 | };
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| 167 |
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| 168 | #define FTRACE_CMP_TYPE(var, type) \
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| 169 | __builtin_types_compatible_p(typeof(var), type *)
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| 170 |
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| 171 | #undef IF_ASSIGN
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| 172 | #define IF_ASSIGN(var, entry, etype, id) \
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| 173 | if (FTRACE_CMP_TYPE(var, etype)) { \
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| 174 | var = (typeof(var))(entry); \
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| 175 | WARN_ON(id && (entry)->type != id); \
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| 176 | break; \
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| 177 | }
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| 178 |
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| 179 |
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| 180 | extern void __ftrace_bad_type(void);
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| 181 |
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| 182 | |
| 183 | * The trace_assign_type is a verifier that the entry type is
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| 184 | * the same as the type being assigned. To add new types simply
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| 185 | * add a line with the following format:
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| 186 | *
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| 187 | * IF_ASSIGN(var, ent, type, id);
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| 188 | *
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| 189 | * Where "type" is the trace type that includes the trace_entry
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| 190 | * as the "ent" item. And "id" is the trace identifier that is
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| 191 | * used in the trace_type enum.
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| 192 | *
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| 193 | * If the type can have more than one id, then use zero.
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| 194 |
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| 195 | #define trace_assign_type(var, ent) \
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| 196 | do { \
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| 197 | IF_ASSIGN(var, ent, struct ftrace_entry, TRACE_FN); \
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| 198 | IF_ASSIGN(var, ent, struct ctx_switch_entry, 0); \
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| 199 | IF_ASSIGN(var, ent, struct stack_entry, TRACE_STACK); \
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| 200 | IF_ASSIGN(var, ent, struct userstack_entry, TRACE_USER_STACK);\
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| 201 | IF_ASSIGN(var, ent, struct print_entry, TRACE_PRINT); \
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| 202 | IF_ASSIGN(var, ent, struct bprint_entry, TRACE_BPRINT); \
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| 203 | IF_ASSIGN(var, ent, struct trace_mmiotrace_rw, \
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| 204 | TRACE_MMIO_RW); \
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| 205 | IF_ASSIGN(var, ent, struct trace_mmiotrace_map, \
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| 206 | TRACE_MMIO_MAP); \
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| 207 | IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
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| 208 | IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry, \
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| 209 | TRACE_GRAPH_ENT); \
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| 210 | IF_ASSIGN(var, ent, struct ftrace_graph_ret_entry, \
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| 211 | TRACE_GRAPH_RET); \
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| 212 | __ftrace_bad_type(); \
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| 213 | } while (0)
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| 214 |
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| 215 | |
| 216 | * An option specific to a tracer. This is a boolean value.
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| 217 | * The bit is the bit index that sets its value on the
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| 218 | * flags value in struct tracer_flags.
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| 219 |
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| 220 | struct tracer_opt {
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| 221 | const char *name;
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| 222 | u32 bit;
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| 223 | };
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| 224 |
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| 225 | |
| 226 | * The set of specific options for a tracer. Your tracer
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| 227 | * have to set the initial value of the flags val.
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| 228 |
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| 229 | struct tracer_flags {
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| 230 | u32 val;
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| 231 | struct tracer_opt *opts;
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| 232 | };
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| 233 |
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| 234 |
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| 235 | #define TRACER_OPT(s, b) .name = #s, .bit = b
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| 236 |
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| 237 |
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| 238 | |
| 239 | * struct tracer - a specific tracer and its callbacks to interact with debugfs
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| 240 | * @name: the name chosen to select it on the available_tracers file
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| 241 | * @init: called when one switches to this tracer (echo name > current_tracer)
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| 242 | * @reset: called when one switches to another tracer
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| 243 | * @start: called when tracing is unpaused (echo 1 > tracing_enabled)
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| 244 | * @stop: called when tracing is paused (echo 0 > tracing_enabled)
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| 245 | * @open: called when the trace file is opened
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| 246 | * @pipe_open: called when the trace_pipe file is opened
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| 247 | * @wait_pipe: override how the user waits for traces on trace_pipe
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| 248 | * @close: called when the trace file is released
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| 249 | * @pipe_close: called when the trace_pipe file is released
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| 250 | * @read: override the default read callback on trace_pipe
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| 251 | * @splice_read: override the default splice_read callback on trace_pipe
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| 252 | * @selftest: selftest to run on boot (see trace_selftest.c)
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| 253 | * @print_headers: override the first lines that describe your columns
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| 254 | * @print_line: callback that prints a trace
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| 255 | * @set_flag: signals one of your private flags changed (trace_options file)
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| 256 | * @flags: your private flags
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| 257 |
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| 258 | struct tracer {
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| 259 | const char *name;
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| 260 | int (*init)(struct trace_array *tr);
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| 261 | void (*reset)(struct trace_array *tr);
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| 262 | void (*start)(struct trace_array *tr);
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| 263 | void (*stop)(struct trace_array *tr);
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| 264 | void (*open)(struct trace_iterator *iter);
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| 265 | void (*pipe_open)(struct trace_iterator *iter);
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| 266 | void (*wait_pipe)(struct trace_iterator *iter);
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| 267 | void (*close)(struct trace_iterator *iter);
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| 268 | void (*pipe_close)(struct trace_iterator *iter);
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| 269 | ssize_t (*read)(struct trace_iterator *iter,
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| 270 | struct file *filp, char __user *ubuf,
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| 271 | size_t cnt, loff_t *ppos);
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| 272 | ssize_t (*splice_read)(struct trace_iterator *iter,
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| 273 | struct file *filp,
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| 274 | loff_t *ppos,
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| 275 | struct pipe_inode_info *pipe,
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| 276 | size_t len,
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| 277 | unsigned int flags);
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| 278 | #ifdef CONFIG_FTRACE_STARTUP_TEST
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| 279 | int (*selftest)(struct tracer *trace,
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| 280 | struct trace_array *tr);
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| 281 | #endif
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| 282 | void (*print_header)(struct seq_file *m);
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| 283 | enum print_line_t (*print_line)(struct trace_iterator *iter);
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| 284 |
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| 285 | int (*set_flag)(u32 old_flags, u32 bit, int set);
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| 286 | struct tracer *next;
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| 287 | struct tracer_flags *flags;
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| 288 | bool print_max;
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| 289 | bool use_max_tr;
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| 290 | };
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| 291 |
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| 292 |
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| 293 |
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| 294 | #define trace_recursion_inc() do { (current)->trace_recursion++; } while (0)
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| 295 | #define trace_recursion_dec() do { (current)->trace_recursion--; } while (0)
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| 296 |
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| 297 |
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| 298 | #define trace_recursion_buffer() ((current)->trace_recursion & 0x3ff)
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| 299 |
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| 300 |
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| 301 | #define TRACE_INTERNAL_BIT (1<<11)
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| 302 | #define TRACE_GLOBAL_BIT (1<<12)
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| 303 | #define TRACE_CONTROL_BIT (1<<13)
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| 304 |
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| 305 | |
| 306 | * Abuse of the trace_recursion.
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| 307 | * As we need a way to maintain state if we are tracing the function
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| 308 | * graph in irq because we want to trace a particular function that
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| 309 | * was called in irq context but we have irq tracing off. Since this
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| 310 | * can only be modified by current, we can reuse trace_recursion.
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| 311 |
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| 312 | #define TRACE_IRQ_BIT (1<<13)
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| 313 |
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| 314 | #define trace_recursion_set(bit) do { (current)->trace_recursion |= (bit); } while (0)
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| 315 | #define trace_recursion_clear(bit) do { (current)->trace_recursion &= ~(bit); } while (0)
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| 316 | #define trace_recursion_test(bit) ((current)->trace_recursion & (bit))
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| 317 |
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| 318 | #define TRACE_PIPE_ALL_CPU -1
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| 319 |
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| 320 | static inline struct ring_buffer_iter *
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| 321 | trace_buffer_iter(struct trace_iterator *iter, int cpu)
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| 322 | {
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| 323 | if (iter->buffer_iter && iter->buffer_iter[cpu])
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| 324 | return iter->buffer_iter[cpu];
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| 325 | return NULL;
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| 326 | }
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| 327 |
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| 328 | int tracer_init(struct tracer *t, struct trace_array *tr);
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| 329 | int tracing_is_enabled(void);
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| 330 | void tracing_reset(struct trace_array *tr, int cpu);
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| 331 | void tracing_reset_online_cpus(struct trace_array *tr);
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| 332 | void tracing_reset_current(int cpu);
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| 333 | void tracing_reset_current_online_cpus(void);
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| 334 | int tracing_open_generic(struct inode *inode, struct file *filp);
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| 335 | struct dentry *trace_create_file(const char *name,
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| 336 | umode_t mode,
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| 337 | struct dentry *parent,
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| 338 | void *data,
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| 339 | const struct file_operations *fops);
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| 340 |
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| 341 | struct dentry *tracing_init_dentry(void);
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| 342 |
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| 343 | struct ring_buffer_event;
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| 344 |
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| 345 | struct ring_buffer_event *
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| 346 | trace_buffer_lock_reserve(struct ring_buffer *buffer,
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| 347 | int type,
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| 348 | unsigned long len,
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| 349 | unsigned long flags,
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| 350 | int pc);
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| 351 |
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| 352 | struct trace_entry *tracing_get_trace_entry(struct trace_array *tr,
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| 353 | struct trace_array_cpu *data);
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| 354 |
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| 355 | struct trace_entry *trace_find_next_entry(struct trace_iterator *iter,
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| 356 | int *ent_cpu, u64 *ent_ts);
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| 357 |
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| 358 | void __buffer_unlock_commit(struct ring_buffer *buffer,
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| 359 | struct ring_buffer_event *event);
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| 360 |
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| 361 | int trace_empty(struct trace_iterator *iter);
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| 362 |
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| 363 | void *trace_find_next_entry_inc(struct trace_iterator *iter);
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| 364 |
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| 365 | void trace_init_global_iter(struct trace_iterator *iter);
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| 366 |
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| 367 | void tracing_iter_reset(struct trace_iterator *iter, int cpu);
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| 368 |
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| 369 | void poll_wait_pipe(struct trace_iterator *iter);
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| 370 |
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| 371 | void ftrace(struct trace_array *tr,
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| 372 | struct trace_array_cpu *data,
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| 373 | unsigned long ip,
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| 374 | unsigned long parent_ip,
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| 375 | unsigned long flags, int pc);
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| 376 | void tracing_sched_switch_trace(struct trace_array *tr,
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| 377 | struct task_struct *prev,
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| 378 | struct task_struct *next,
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| 379 | unsigned long flags, int pc);
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| 380 |
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| 381 | void tracing_sched_wakeup_trace(struct trace_array *tr,
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| 382 | struct task_struct *wakee,
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| 383 | struct task_struct *cur,
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| 384 | unsigned long flags, int pc);
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| 385 | void trace_function(struct trace_array *tr,
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| 386 | unsigned long ip,
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| 387 | unsigned long parent_ip,
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| 388 | unsigned long flags, int pc);
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| 389 | void trace_graph_function(struct trace_array *tr,
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| 390 | unsigned long ip,
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| 391 | unsigned long parent_ip,
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| 392 | unsigned long flags, int pc);
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| 393 | void trace_latency_header(struct seq_file *m);
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| 394 | void trace_default_header(struct seq_file *m);
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| 395 | void print_trace_header(struct seq_file *m, struct trace_iterator *iter);
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| 396 | int trace_empty(struct trace_iterator *iter);
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| 397 |
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| 398 | void trace_graph_return(struct ftrace_graph_ret *trace);
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| 399 | int trace_graph_entry(struct ftrace_graph_ent *trace);
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| 400 | void set_graph_array(struct trace_array *tr);
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| 401 |
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| 402 | void tracing_start_cmdline_record(void);
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| 403 | void tracing_stop_cmdline_record(void);
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| 404 | void tracing_sched_switch_assign_trace(struct trace_array *tr);
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| 405 | void tracing_stop_sched_switch_record(void);
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| 406 | void tracing_start_sched_switch_record(void);
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| 407 | int register_tracer(struct tracer *type);
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| 408 | int is_tracing_stopped(void);
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| 409 |
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| 410 | extern cpumask_var_t __read_mostly tracing_buffer_mask;
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| 411 |
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| 412 | #define for_each_tracing_cpu(cpu) \
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| 413 | for_each_cpu(cpu, tracing_buffer_mask)
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| 414 |
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| 415 | extern unsigned long nsecs_to_usecs(unsigned long nsecs);
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| 416 |
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| 417 | extern unsigned long tracing_thresh;
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| 418 |
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| 419 | #ifdef CONFIG_TRACER_MAX_TRACE
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| 420 | extern unsigned long tracing_max_latency;
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| 421 |
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| 422 | void update_max_tr(struct trace_array *tr, struct task_struct *tsk, int cpu);
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| 423 | void update_max_tr_single(struct trace_array *tr,
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| 424 | struct task_struct *tsk, int cpu);
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| 425 | #endif
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| 426 |
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| 427 | #ifdef CONFIG_STACKTRACE
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| 428 | void ftrace_trace_stack(struct ring_buffer *buffer, unsigned long flags,
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| 429 | int skip, int pc);
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| 430 |
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| 431 | void ftrace_trace_stack_regs(struct ring_buffer *buffer, unsigned long flags,
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| 432 | int skip, int pc, struct pt_regs *regs);
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| 433 |
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| 434 | void ftrace_trace_userstack(struct ring_buffer *buffer, unsigned long flags,
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| 435 | int pc);
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| 436 |
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| 437 | void __trace_stack(struct trace_array *tr, unsigned long flags, int skip,
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| 438 | int pc);
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| 439 | #else
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| 440 | static inline void ftrace_trace_stack(struct ring_buffer *buffer,
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| 441 | unsigned long flags, int skip, int pc)
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| 442 | {
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| 443 | }
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| 444 |
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| 445 | static inline void ftrace_trace_stack_regs(struct ring_buffer *buffer,
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| 446 | unsigned long flags, int skip,
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| 447 | int pc, struct pt_regs *regs)
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| 448 | {
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| 449 | }
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| 450 |
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| 451 | static inline void ftrace_trace_userstack(struct ring_buffer *buffer,
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| 452 | unsigned long flags, int pc)
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| 453 | {
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| 454 | }
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| 455 |
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| 456 | static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
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| 457 | int skip, int pc)
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| 458 | {
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| 459 | }
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| 460 | #endif
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| 461 |
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| 462 | extern cycle_t ftrace_now(int cpu);
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| 463 |
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| 464 | extern void trace_find_cmdline(int pid, char comm[]);
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| 465 |
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| 466 | #ifdef CONFIG_DYNAMIC_FTRACE
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| 467 | extern unsigned long ftrace_update_tot_cnt;
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| 468 | #endif
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| 469 | #define DYN_FTRACE_TEST_NAME trace_selftest_dynamic_test_func
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| 470 | extern int DYN_FTRACE_TEST_NAME(void);
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| 471 | #define DYN_FTRACE_TEST_NAME2 trace_selftest_dynamic_test_func2
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| 472 | extern int DYN_FTRACE_TEST_NAME2(void);
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| 473 |
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| 474 | extern int ring_buffer_expanded;
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| 475 | extern bool tracing_selftest_disabled;
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| 476 | DECLARE_PER_CPU(int, ftrace_cpu_disabled);
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| 477 |
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| 478 | #ifdef CONFIG_FTRACE_STARTUP_TEST
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| 479 | extern int trace_selftest_startup_function(struct tracer *trace,
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| 480 | struct trace_array *tr);
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| 481 | extern int trace_selftest_startup_function_graph(struct tracer *trace,
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| 482 | struct trace_array *tr);
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| 483 | extern int trace_selftest_startup_irqsoff(struct tracer *trace,
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| 484 | struct trace_array *tr);
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| 485 | extern int trace_selftest_startup_preemptoff(struct tracer *trace,
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| 486 | struct trace_array *tr);
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| 487 | extern int trace_selftest_startup_preemptirqsoff(struct tracer *trace,
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| 488 | struct trace_array *tr);
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| 489 | extern int trace_selftest_startup_wakeup(struct tracer *trace,
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| 490 | struct trace_array *tr);
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| 491 | extern int trace_selftest_startup_nop(struct tracer *trace,
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| 492 | struct trace_array *tr);
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| 493 | extern int trace_selftest_startup_sched_switch(struct tracer *trace,
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| 494 | struct trace_array *tr);
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| 495 | extern int trace_selftest_startup_branch(struct tracer *trace,
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| 496 | struct trace_array *tr);
|
| 497 | #endif
|
| 498 |
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| 499 | extern void *head_page(struct trace_array_cpu *data);
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| 500 | extern unsigned long long ns2usecs(cycle_t nsec);
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| 501 | extern int
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| 502 | trace_vbprintk(unsigned long ip, const char *fmt, va_list args);
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| 503 | extern int
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| 504 | trace_vprintk(unsigned long ip, const char *fmt, va_list args);
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| 505 | extern int
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| 506 | trace_array_vprintk(struct trace_array *tr,
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| 507 | unsigned long ip, const char *fmt, va_list args);
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| 508 | int trace_array_printk(struct trace_array *tr,
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| 509 | unsigned long ip, const char *fmt, ...);
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| 510 | void trace_printk_seq(struct trace_seq *s);
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| 511 | enum print_line_t print_trace_line(struct trace_iterator *iter);
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| 512 |
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| 513 | extern unsigned long trace_flags;
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| 514 |
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| 515 | extern int trace_clock_id;
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| 516 |
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| 517 |
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| 518 | #ifdef CONFIG_FUNCTION_GRAPH_TRACER
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| 519 |
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| 520 |
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| 521 | #define TRACE_GRAPH_PRINT_OVERRUN 0x1
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| 522 | #define TRACE_GRAPH_PRINT_CPU 0x2
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| 523 | #define TRACE_GRAPH_PRINT_OVERHEAD 0x4
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| 524 | #define TRACE_GRAPH_PRINT_PROC 0x8
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| 525 | #define TRACE_GRAPH_PRINT_DURATION 0x10
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| 526 | #define TRACE_GRAPH_PRINT_ABS_TIME 0x20
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| 527 |
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| 528 | extern enum print_line_t
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| 529 | print_graph_function_flags(struct trace_iterator *iter, u32 flags);
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| 530 | extern void print_graph_headers_flags(struct seq_file *s, u32 flags);
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| 531 | extern enum print_line_t
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| 532 | trace_print_graph_duration(unsigned long long duration, struct trace_seq *s);
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| 533 | extern void graph_trace_open(struct trace_iterator *iter);
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| 534 | extern void graph_trace_close(struct trace_iterator *iter);
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| 535 | extern int __trace_graph_entry(struct trace_array *tr,
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| 536 | struct ftrace_graph_ent *trace,
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| 537 | unsigned long flags, int pc);
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| 538 | extern void __trace_graph_return(struct trace_array *tr,
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| 539 | struct ftrace_graph_ret *trace,
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| 540 | unsigned long flags, int pc);
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| 541 |
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| 542 |
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| 543 | #ifdef CONFIG_DYNAMIC_FTRACE
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| 544 |
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| 545 | #define FTRACE_GRAPH_MAX_FUNCS 32
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| 546 | extern int ftrace_graph_filter_enabled;
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| 547 | extern int ftrace_graph_count;
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| 548 | extern unsigned long ftrace_graph_funcs[FTRACE_GRAPH_MAX_FUNCS];
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| 549 |
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| 550 | static inline int ftrace_graph_addr(unsigned long addr)
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| 551 | {
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| 552 | int i;
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| 553 |
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| 554 | if (!ftrace_graph_filter_enabled)
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| 555 | return 1;
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| 556 |
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| 557 | for (i = 0; i < ftrace_graph_count; i++) {
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| 558 | if (addr == ftrace_graph_funcs[i]) {
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| 559 | |
| 560 | * If no irqs are to be traced, but a set_graph_function
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| 561 | * is set, and called by an interrupt handler, we still
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| 562 | * want to trace it.
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| 563 |
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| 564 | if (in_irq())
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| 565 | trace_recursion_set(TRACE_IRQ_BIT);
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| 566 | else
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| 567 | trace_recursion_clear(TRACE_IRQ_BIT);
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| 568 | return 1;
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| 569 | }
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| 570 | }
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| 571 |
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| 572 | return 0;
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| 573 | }
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| 574 | #else
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| 575 | static inline int ftrace_graph_addr(unsigned long addr)
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| 576 | {
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| 577 | return 1;
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| 578 | }
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| 579 | #endif
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| 580 | #else
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| 581 | static inline enum print_line_t
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| 582 | print_graph_function_flags(struct trace_iterator *iter, u32 flags)
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| 583 | {
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| 584 | return TRACE_TYPE_UNHANDLED;
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| 585 | }
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| 586 | #endif
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| 587 |
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| 588 | extern struct list_head ftrace_pids;
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| 589 |
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| 590 | #ifdef CONFIG_FUNCTION_TRACER
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| 591 | static inline int ftrace_trace_task(struct task_struct *task)
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| 592 | {
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| 593 | if (list_empty(&ftrace_pids))
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| 594 | return 1;
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| 595 |
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| 596 | return test_tsk_trace_trace(task);
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| 597 | }
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| 598 | extern int ftrace_is_dead(void);
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| 599 | #else
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| 600 | static inline int ftrace_trace_task(struct task_struct *task)
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| 601 | {
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| 602 | return 1;
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| 603 | }
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| 604 | static inline int ftrace_is_dead(void) { return 0; }
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| 605 | #endif
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| 606 |
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| 607 | int ftrace_event_is_function(struct ftrace_event_call *call);
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| 608 |
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| 609 | |
| 610 | * struct trace_parser - servers for reading the user input separated by spaces
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| 611 | * @cont: set if the input is not complete - no final space char was found
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| 612 | * @buffer: holds the parsed user input
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| 613 | * @idx: user input length
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| 614 | * @size: buffer size
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| 615 |
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| 616 | struct trace_parser {
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| 617 | bool cont;
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| 618 | char *buffer;
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| 619 | unsigned idx;
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| 620 | unsigned size;
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| 621 | };
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| 622 |
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| 623 | static inline bool trace_parser_loaded(struct trace_parser *parser)
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| 624 | {
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| 625 | return (parser->idx != 0);
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| 626 | }
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| 627 |
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| 628 | static inline bool trace_parser_cont(struct trace_parser *parser)
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| 629 | {
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| 630 | return parser->cont;
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| 631 | }
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| 632 |
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| 633 | static inline void trace_parser_clear(struct trace_parser *parser)
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| 634 | {
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| 635 | parser->cont = false;
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| 636 | parser->idx = 0;
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| 637 | }
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| 638 |
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| 639 | extern int trace_parser_get_init(struct trace_parser *parser, int size);
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| 640 | extern void trace_parser_put(struct trace_parser *parser);
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| 641 | extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
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| 642 | size_t cnt, loff_t *ppos);
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| 643 |
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| 644 | |
| 645 | * trace_iterator_flags is an enumeration that defines bit
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| 646 | * positions into trace_flags that controls the output.
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| 647 | *
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| 648 | * NOTE: These bits must match the trace_options array in
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| 649 | * trace.c.
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| 650 |
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| 651 | enum trace_iterator_flags {
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| 652 | TRACE_ITER_PRINT_PARENT = 0x01,
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| 653 | TRACE_ITER_SYM_OFFSET = 0x02,
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| 654 | TRACE_ITER_SYM_ADDR = 0x04,
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| 655 | TRACE_ITER_VERBOSE = 0x08,
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| 656 | TRACE_ITER_RAW = 0x10,
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| 657 | TRACE_ITER_HEX = 0x20,
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| 658 | TRACE_ITER_BIN = 0x40,
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| 659 | TRACE_ITER_BLOCK = 0x80,
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| 660 | TRACE_ITER_STACKTRACE = 0x100,
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| 661 | TRACE_ITER_PRINTK = 0x200,
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| 662 | TRACE_ITER_PREEMPTONLY = 0x400,
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| 663 | TRACE_ITER_BRANCH = 0x800,
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| 664 | TRACE_ITER_ANNOTATE = 0x1000,
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| 665 | TRACE_ITER_USERSTACKTRACE = 0x2000,
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| 666 | TRACE_ITER_SYM_USEROBJ = 0x4000,
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| 667 | TRACE_ITER_PRINTK_MSGONLY = 0x8000,
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| 668 | TRACE_ITER_CONTEXT_INFO = 0x10000,
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| 669 | TRACE_ITER_LATENCY_FMT = 0x20000,
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| 670 | TRACE_ITER_SLEEP_TIME = 0x40000,
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| 671 | TRACE_ITER_GRAPH_TIME = 0x80000,
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| 672 | TRACE_ITER_RECORD_CMD = 0x100000,
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| 673 | TRACE_ITER_OVERWRITE = 0x200000,
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| 674 | TRACE_ITER_STOP_ON_FREE = 0x400000,
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| 675 | TRACE_ITER_IRQ_INFO = 0x800000,
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| 676 | TRACE_ITER_MARKERS = 0x1000000,
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| 677 | };
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| 678 |
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| 679 | |
| 680 | * TRACE_ITER_SYM_MASK masks the options in trace_flags that
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| 681 | * control the output of kernel symbols.
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| 682 |
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| 683 | #define TRACE_ITER_SYM_MASK \
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| 684 | (TRACE_ITER_PRINT_PARENT|TRACE_ITER_SYM_OFFSET|TRACE_ITER_SYM_ADDR)
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| 685 |
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| 686 | extern struct tracer nop_trace;
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| 687 |
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| 688 | #ifdef CONFIG_BRANCH_TRACER
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| 689 | extern int enable_branch_tracing(struct trace_array *tr);
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| 690 | extern void disable_branch_tracing(void);
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| 691 | static inline int trace_branch_enable(struct trace_array *tr)
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| 692 | {
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| 693 | if (trace_flags & TRACE_ITER_BRANCH)
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| 694 | return enable_branch_tracing(tr);
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| 695 | return 0;
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| 696 | }
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| 697 | static inline void trace_branch_disable(void)
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| 698 | {
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| 699 |
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| 700 | disable_branch_tracing();
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| 701 | }
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| 702 | #else
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| 703 | static inline int trace_branch_enable(struct trace_array *tr)
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| 704 | {
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| 705 | return 0;
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| 706 | }
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| 707 | static inline void trace_branch_disable(void)
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| 708 | {
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| 709 | }
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| 710 | #endif
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| 711 |
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| 712 |
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| 713 | int tracing_update_buffers(void);
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| 714 |
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| 715 |
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| 716 | enum {
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| 717 | TRACE_EVENT_TYPE_PRINTF = 1,
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| 718 | TRACE_EVENT_TYPE_RAW = 2,
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| 719 | };
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| 720 |
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| 721 | struct ftrace_event_field {
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| 722 | struct list_head link;
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| 723 | char *name;
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| 724 | char *type;
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| 725 | int filter_type;
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| 726 | int offset;
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| 727 | int size;
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| 728 | int is_signed;
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| 729 | };
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| 730 |
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| 731 | struct event_filter {
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| 732 | int n_preds;
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| 733 | int a_preds;
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| 734 | struct filter_pred *preds;
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| 735 | struct filter_pred *root;
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| 736 | char *filter_string;
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| 737 | };
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| 738 |
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| 739 | struct event_subsystem {
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| 740 | struct list_head list;
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| 741 | const char *name;
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| 742 | struct dentry *entry;
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| 743 | struct event_filter *filter;
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| 744 | int nr_events;
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| 745 | int ref_count;
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| 746 | };
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| 747 |
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| 748 | #define FILTER_PRED_INVALID ((unsigned short)-1)
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| 749 | #define FILTER_PRED_IS_RIGHT (1 << 15)
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| 750 | #define FILTER_PRED_FOLD (1 << 15)
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| 751 |
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| 752 | |
| 753 | * The max preds is the size of unsigned short with
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| 754 | * two flags at the MSBs. One bit is used for both the IS_RIGHT
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| 755 | * and FOLD flags. The other is reserved.
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| 756 | *
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| 757 | * 2^14 preds is way more than enough.
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| 758 |
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| 759 | #define MAX_FILTER_PRED 16384
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| 760 |
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| 761 | struct filter_pred;
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| 762 | struct regex;
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| 763 |
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| 764 | typedef int (*filter_pred_fn_t) (struct filter_pred *pred, void *event);
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| 765 |
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| 766 | typedef int (*regex_match_func)(char *str, struct regex *r, int len);
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| 767 |
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| 768 | enum regex_type {
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| 769 | MATCH_FULL = 0,
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| 770 | MATCH_FRONT_ONLY,
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| 771 | MATCH_MIDDLE_ONLY,
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| 772 | MATCH_END_ONLY,
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| 773 | };
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| 774 |
|
| 775 | struct regex {
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| 776 | char pattern[MAX_FILTER_STR_VAL];
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| 777 | int len;
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| 778 | int field_len;
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| 779 | regex_match_func match;
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| 780 | };
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| 781 |
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| 782 | struct filter_pred {
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| 783 | filter_pred_fn_t fn;
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| 784 | u64 val;
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| 785 | struct regex regex;
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| 786 | unsigned short *ops;
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| 787 | struct ftrace_event_field *field;
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| 788 | int offset;
|
| 789 | int not;
|
| 790 | int op;
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| 791 | unsigned short index;
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| 792 | unsigned short parent;
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| 793 | unsigned short left;
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| 794 | unsigned short right;
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| 795 | };
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| 796 |
|
| 797 | extern struct list_head ftrace_common_fields;
|
| 798 |
|
| 799 | extern enum regex_type
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| 800 | filter_parse_regex(char *buff, int len, char **search, int *not);
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| 801 | extern void print_event_filter(struct ftrace_event_call *call,
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| 802 | struct trace_seq *s);
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| 803 | extern int apply_event_filter(struct ftrace_event_call *call,
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| 804 | char *filter_string);
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| 805 | extern int apply_subsystem_event_filter(struct event_subsystem *system,
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| 806 | char *filter_string);
|
| 807 | extern void print_subsystem_event_filter(struct event_subsystem *system,
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| 808 | struct trace_seq *s);
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| 809 | extern int filter_assign_type(const char *type);
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| 810 |
|
| 811 | struct list_head *
|
| 812 | trace_get_fields(struct ftrace_event_call *event_call);
|
| 813 |
|
| 814 | static inline int
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| 815 | filter_check_discard(struct ftrace_event_call *call, void *rec,
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| 816 | struct ring_buffer *buffer,
|
| 817 | struct ring_buffer_event *event)
|
| 818 | {
|
| 819 | if (unlikely(call->flags & TRACE_EVENT_FL_FILTERED) &&
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| 820 | !filter_match_preds(call->filter, rec)) {
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| 821 | ring_buffer_discard_commit(buffer, event);
|
| 822 | return 1;
|
| 823 | }
|
| 824 |
|
| 825 | return 0;
|
| 826 | }
|
| 827 |
|
| 828 | extern void trace_event_enable_cmd_record(bool enable);
|
| 829 |
|
| 830 | extern struct mutex event_mutex;
|
| 831 | extern struct list_head ftrace_events;
|
| 832 |
|
| 833 | extern const char *__start___trace_bprintk_fmt[];
|
| 834 | extern const char *__stop___trace_bprintk_fmt[];
|
| 835 |
|
| 836 | void trace_printk_init_buffers(void);
|
| 837 | void trace_printk_start_comm(void);
|
| 838 |
|
| 839 | #undef FTRACE_ENTRY
|
| 840 | #define FTRACE_ENTRY(call, struct_name, id, tstruct, print, filter) \
|
| 841 | extern struct ftrace_event_call \
|
| 842 | __attribute__((__aligned__(4))) event_##call;
|
| 843 | #undef FTRACE_ENTRY_DUP
|
| 844 | #define FTRACE_ENTRY_DUP(call, struct_name, id, tstruct, print, filter) \
|
| 845 | FTRACE_ENTRY(call, struct_name, id, PARAMS(tstruct), PARAMS(print), \
|
| 846 | filter)
|
| 847 | #include "trace_entries.h"
|
| 848 |
|
| 849 | #if defined(CONFIG_PERF_EVENTS) && defined(CONFIG_FUNCTION_TRACER)
|
| 850 | int perf_ftrace_event_register(struct ftrace_event_call *call,
|
| 851 | enum trace_reg type, void *data);
|
| 852 | #else
|
| 853 | #define perf_ftrace_event_register NULL
|
| 854 | #endif
|
| 855 |
|
| 856 | #endif
|