1 #ifndef _LINUX_FTRACE_H 2 #define _LINUX_FTRACE_H 3 4 #include <linux/linkage.h> 5 #include <linux/fs.h> 6 #include <linux/ktime.h> 7 #include <linux/init.h> 8 #include <linux/types.h> 9 #include <linux/kallsyms.h> 10 11 #ifdef CONFIG_FTRACE 12 13 extern int ftrace_enabled; 14 extern int 15 ftrace_enable_sysctl(struct ctl_table *table, int write, 16 struct file *filp, void __user *buffer, size_t *lenp, 17 loff_t *ppos); 18 19 typedef void (*ftrace_func_t)(unsigned long ip, unsigned long parent_ip); 20 21 struct ftrace_ops { 22 ftrace_func_t func; 23 struct ftrace_ops *next; 24 }; 25 26 /* 27 * The ftrace_ops must be a static and should also 28 * be read_mostly. These functions do modify read_mostly variables 29 * so use them sparely. Never free an ftrace_op or modify the 30 * next pointer after it has been registered. Even after unregistering 31 * it, the next pointer may still be used internally. 32 */ 33 int register_ftrace_function(struct ftrace_ops *ops); 34 int unregister_ftrace_function(struct ftrace_ops *ops); 35 void clear_ftrace_function(void); 36 37 extern void ftrace_stub(unsigned long a0, unsigned long a1); 38 39 #else /* !CONFIG_FTRACE */ 40 # define register_ftrace_function(ops) do { } while (0) 41 # define unregister_ftrace_function(ops) do { } while (0) 42 # define clear_ftrace_function(ops) do { } while (0) 43 static inline void ftrace_kill_atomic(void) { } 44 #endif /* CONFIG_FTRACE */ 45 46 #ifdef CONFIG_DYNAMIC_FTRACE 47 # define FTRACE_HASHBITS 10 48 # define FTRACE_HASHSIZE (1<<FTRACE_HASHBITS) 49 50 enum { 51 FTRACE_FL_FREE = (1 << 0), 52 FTRACE_FL_FAILED = (1 << 1), 53 FTRACE_FL_FILTER = (1 << 2), 54 FTRACE_FL_ENABLED = (1 << 3), 55 FTRACE_FL_NOTRACE = (1 << 4), 56 FTRACE_FL_CONVERTED = (1 << 5), 57 FTRACE_FL_FROZEN = (1 << 6), 58 }; 59 60 struct dyn_ftrace { 61 struct hlist_node node; 62 unsigned long ip; /* address of mcount call-site */ 63 unsigned long flags; 64 }; 65 66 int ftrace_force_update(void); 67 void ftrace_set_filter(unsigned char *buf, int len, int reset); 68 69 /* defined in arch */ 70 extern int ftrace_ip_converted(unsigned long ip); 71 extern unsigned char *ftrace_nop_replace(void); 72 extern unsigned char *ftrace_call_replace(unsigned long ip, unsigned long addr); 73 extern int ftrace_dyn_arch_init(void *data); 74 extern int ftrace_mcount_set(unsigned long *data); 75 extern int ftrace_modify_code(unsigned long ip, unsigned char *old_code, 76 unsigned char *new_code); 77 extern int ftrace_update_ftrace_func(ftrace_func_t func); 78 extern void ftrace_caller(void); 79 extern void ftrace_call(void); 80 extern void mcount_call(void); 81 82 extern int skip_trace(unsigned long ip); 83 84 extern void ftrace_release(void *start, unsigned long size); 85 86 extern void ftrace_disable_daemon(void); 87 extern void ftrace_enable_daemon(void); 88 89 #else 90 # define skip_trace(ip) ({ 0; }) 91 # define ftrace_force_update() ({ 0; }) 92 # define ftrace_set_filter(buf, len, reset) do { } while (0) 93 # define ftrace_disable_daemon() do { } while (0) 94 # define ftrace_enable_daemon() do { } while (0) 95 static inline void ftrace_release(void *start, unsigned long size) { } 96 #endif /* CONFIG_DYNAMIC_FTRACE */ 97 98 /* totally disable ftrace - can not re-enable after this */ 99 void ftrace_kill(void); 100 void ftrace_kill_atomic(void); 101 102 static inline void tracer_disable(void) 103 { 104 #ifdef CONFIG_FTRACE 105 ftrace_enabled = 0; 106 #endif 107 } 108 109 /* 110 * Ftrace disable/restore without lock. Some synchronization mechanism 111 * must be used to prevent ftrace_enabled to be changed between 112 * disable/restore. 113 */ 114 static inline int __ftrace_enabled_save(void) 115 { 116 #ifdef CONFIG_FTRACE 117 int saved_ftrace_enabled = ftrace_enabled; 118 ftrace_enabled = 0; 119 return saved_ftrace_enabled; 120 #else 121 return 0; 122 #endif 123 } 124 125 static inline void __ftrace_enabled_restore(int enabled) 126 { 127 #ifdef CONFIG_FTRACE 128 ftrace_enabled = enabled; 129 #endif 130 } 131 132 #ifdef CONFIG_FRAME_POINTER 133 /* TODO: need to fix this for ARM */ 134 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) 135 # define CALLER_ADDR1 ((unsigned long)__builtin_return_address(1)) 136 # define CALLER_ADDR2 ((unsigned long)__builtin_return_address(2)) 137 # define CALLER_ADDR3 ((unsigned long)__builtin_return_address(3)) 138 # define CALLER_ADDR4 ((unsigned long)__builtin_return_address(4)) 139 # define CALLER_ADDR5 ((unsigned long)__builtin_return_address(5)) 140 # define CALLER_ADDR6 ((unsigned long)__builtin_return_address(6)) 141 #else 142 # define CALLER_ADDR0 ((unsigned long)__builtin_return_address(0)) 143 # define CALLER_ADDR1 0UL 144 # define CALLER_ADDR2 0UL 145 # define CALLER_ADDR3 0UL 146 # define CALLER_ADDR4 0UL 147 # define CALLER_ADDR5 0UL 148 # define CALLER_ADDR6 0UL 149 #endif 150 151 #ifdef CONFIG_IRQSOFF_TRACER 152 extern void time_hardirqs_on(unsigned long a0, unsigned long a1); 153 extern void time_hardirqs_off(unsigned long a0, unsigned long a1); 154 #else 155 # define time_hardirqs_on(a0, a1) do { } while (0) 156 # define time_hardirqs_off(a0, a1) do { } while (0) 157 #endif 158 159 #ifdef CONFIG_PREEMPT_TRACER 160 extern void trace_preempt_on(unsigned long a0, unsigned long a1); 161 extern void trace_preempt_off(unsigned long a0, unsigned long a1); 162 #else 163 # define trace_preempt_on(a0, a1) do { } while (0) 164 # define trace_preempt_off(a0, a1) do { } while (0) 165 #endif 166 167 #ifdef CONFIG_TRACING 168 extern void 169 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3); 170 171 /** 172 * ftrace_printk - printf formatting in the ftrace buffer 173 * @fmt: the printf format for printing 174 * 175 * Note: __ftrace_printk is an internal function for ftrace_printk and 176 * the @ip is passed in via the ftrace_printk macro. 177 * 178 * This function allows a kernel developer to debug fast path sections 179 * that printk is not appropriate for. By scattering in various 180 * printk like tracing in the code, a developer can quickly see 181 * where problems are occurring. 182 * 183 * This is intended as a debugging tool for the developer only. 184 * Please refrain from leaving ftrace_printks scattered around in 185 * your code. 186 */ 187 # define ftrace_printk(fmt...) __ftrace_printk(_THIS_IP_, fmt) 188 extern int 189 __ftrace_printk(unsigned long ip, const char *fmt, ...) 190 __attribute__ ((format (printf, 2, 3))); 191 extern void ftrace_dump(void); 192 #else 193 static inline void 194 ftrace_special(unsigned long arg1, unsigned long arg2, unsigned long arg3) { } 195 static inline int 196 ftrace_printk(const char *fmt, ...) __attribute__ ((format (printf, 1, 0))); 197 198 static inline int 199 ftrace_printk(const char *fmt, ...) 200 { 201 return 0; 202 } 203 static inline void ftrace_dump(void) { } 204 #endif 205 206 #ifdef CONFIG_FTRACE_MCOUNT_RECORD 207 extern void ftrace_init(void); 208 extern void ftrace_init_module(unsigned long *start, unsigned long *end); 209 #else 210 static inline void ftrace_init(void) { } 211 static inline void 212 ftrace_init_module(unsigned long *start, unsigned long *end) { } 213 #endif 214 215 216 struct boot_trace { 217 pid_t caller; 218 char func[KSYM_NAME_LEN]; 219 int result; 220 unsigned long long duration; /* usecs */ 221 ktime_t calltime; 222 ktime_t rettime; 223 }; 224 225 #ifdef CONFIG_BOOT_TRACER 226 extern void trace_boot(struct boot_trace *it, initcall_t fn); 227 extern void start_boot_trace(void); 228 extern void stop_boot_trace(void); 229 #else 230 static inline void trace_boot(struct boot_trace *it, initcall_t fn) { } 231 static inline void start_boot_trace(void) { } 232 static inline void stop_boot_trace(void) { } 233 #endif 234 235 236 237 #endif /* _LINUX_FTRACE_H */ 238